| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_OBJECTS_H_ |
| #define V8_OBJECTS_H_ |
| |
| #include <iosfwd> |
| #include <memory> |
| |
| #include "src/assert-scope.h" |
| #include "src/bailout-reason.h" |
| #include "src/base/bits.h" |
| #include "src/base/flags.h" |
| #include "src/builtins/builtins.h" |
| #include "src/checks.h" |
| #include "src/elements-kind.h" |
| #include "src/field-index.h" |
| #include "src/flags.h" |
| #include "src/list.h" |
| #include "src/messages.h" |
| #include "src/property-details.h" |
| #include "src/unicode-decoder.h" |
| #include "src/unicode.h" |
| #include "src/zone.h" |
| |
| #if V8_TARGET_ARCH_ARM |
| #include "src/arm/constants-arm.h" // NOLINT |
| #elif V8_TARGET_ARCH_ARM64 |
| #include "src/arm64/constants-arm64.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS |
| #include "src/mips/constants-mips.h" // NOLINT |
| #elif V8_TARGET_ARCH_MIPS64 |
| #include "src/mips64/constants-mips64.h" // NOLINT |
| #elif V8_TARGET_ARCH_PPC |
| #include "src/ppc/constants-ppc.h" // NOLINT |
| #elif V8_TARGET_ARCH_S390 |
| #include "src/s390/constants-s390.h" // NOLINT |
| #endif |
| |
| |
| // |
| // Most object types in the V8 JavaScript are described in this file. |
| // |
| // Inheritance hierarchy: |
| // - Object |
| // - Smi (immediate small integer) |
| // - HeapObject (superclass for everything allocated in the heap) |
| // - JSReceiver (suitable for property access) |
| // - JSObject |
| // - JSArray |
| // - JSArrayBuffer |
| // - JSArrayBufferView |
| // - JSTypedArray |
| // - JSDataView |
| // - JSBoundFunction |
| // - JSCollection |
| // - JSSet |
| // - JSMap |
| // - JSSetIterator |
| // - JSMapIterator |
| // - JSWeakCollection |
| // - JSWeakMap |
| // - JSWeakSet |
| // - JSRegExp |
| // - JSFunction |
| // - JSGeneratorObject |
| // - JSGlobalObject |
| // - JSGlobalProxy |
| // - JSValue |
| // - JSDate |
| // - JSMessageObject |
| // - JSProxy |
| // - FixedArrayBase |
| // - ByteArray |
| // - BytecodeArray |
| // - FixedArray |
| // - DescriptorArray |
| // - FrameArray |
| // - LiteralsArray |
| // - HashTable |
| // - Dictionary |
| // - StringTable |
| // - StringSet |
| // - CompilationCacheTable |
| // - CodeCacheHashTable |
| // - MapCache |
| // - OrderedHashTable |
| // - OrderedHashSet |
| // - OrderedHashMap |
| // - Context |
| // - TypeFeedbackMetadata |
| // - TypeFeedbackVector |
| // - TemplateList |
| // - TransitionArray |
| // - ScopeInfo |
| // - ModuleInfo |
| // - ScriptContextTable |
| // - WeakFixedArray |
| // - FixedDoubleArray |
| // - Name |
| // - String |
| // - SeqString |
| // - SeqOneByteString |
| // - SeqTwoByteString |
| // - SlicedString |
| // - ConsString |
| // - ExternalString |
| // - ExternalOneByteString |
| // - ExternalTwoByteString |
| // - InternalizedString |
| // - SeqInternalizedString |
| // - SeqOneByteInternalizedString |
| // - SeqTwoByteInternalizedString |
| // - ConsInternalizedString |
| // - ExternalInternalizedString |
| // - ExternalOneByteInternalizedString |
| // - ExternalTwoByteInternalizedString |
| // - Symbol |
| // - HeapNumber |
| // - Simd128Value |
| // - Float32x4 |
| // - Int32x4 |
| // - Uint32x4 |
| // - Bool32x4 |
| // - Int16x8 |
| // - Uint16x8 |
| // - Bool16x8 |
| // - Int8x16 |
| // - Uint8x16 |
| // - Bool8x16 |
| // - Cell |
| // - PropertyCell |
| // - Code |
| // - AbstractCode, a wrapper around Code or BytecodeArray |
| // - Map |
| // - Oddball |
| // - Foreign |
| // - SharedFunctionInfo |
| // - Struct |
| // - Box |
| // - AccessorInfo |
| // - AccessorPair |
| // - AccessCheckInfo |
| // - InterceptorInfo |
| // - CallHandlerInfo |
| // - TemplateInfo |
| // - FunctionTemplateInfo |
| // - ObjectTemplateInfo |
| // - Script |
| // - DebugInfo |
| // - BreakPointInfo |
| // - CodeCache |
| // - PrototypeInfo |
| // - WeakCell |
| // |
| // Formats of Object*: |
| // Smi: [31 bit signed int] 0 |
| // HeapObject: [32 bit direct pointer] (4 byte aligned) | 01 |
| |
| namespace v8 { |
| namespace internal { |
| |
| enum KeyedAccessStoreMode { |
| STANDARD_STORE, |
| STORE_TRANSITION_TO_OBJECT, |
| STORE_TRANSITION_TO_DOUBLE, |
| STORE_AND_GROW_NO_TRANSITION, |
| STORE_AND_GROW_TRANSITION_TO_OBJECT, |
| STORE_AND_GROW_TRANSITION_TO_DOUBLE, |
| STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS, |
| STORE_NO_TRANSITION_HANDLE_COW |
| }; |
| |
| |
| enum TypeofMode : int { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF }; |
| |
| |
| enum MutableMode { |
| MUTABLE, |
| IMMUTABLE |
| }; |
| |
| |
| enum ExternalArrayType { |
| kExternalInt8Array = 1, |
| kExternalUint8Array, |
| kExternalInt16Array, |
| kExternalUint16Array, |
| kExternalInt32Array, |
| kExternalUint32Array, |
| kExternalFloat32Array, |
| kExternalFloat64Array, |
| kExternalUint8ClampedArray, |
| }; |
| |
| |
| static inline bool IsTransitionStoreMode(KeyedAccessStoreMode store_mode) { |
| return store_mode == STORE_TRANSITION_TO_OBJECT || |
| store_mode == STORE_TRANSITION_TO_DOUBLE || |
| store_mode == STORE_AND_GROW_TRANSITION_TO_OBJECT || |
| store_mode == STORE_AND_GROW_TRANSITION_TO_DOUBLE; |
| } |
| |
| |
| static inline KeyedAccessStoreMode GetNonTransitioningStoreMode( |
| KeyedAccessStoreMode store_mode) { |
| if (store_mode >= STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS) { |
| return store_mode; |
| } |
| if (store_mode >= STORE_AND_GROW_NO_TRANSITION) { |
| return STORE_AND_GROW_NO_TRANSITION; |
| } |
| return STANDARD_STORE; |
| } |
| |
| |
| static inline bool IsGrowStoreMode(KeyedAccessStoreMode store_mode) { |
| return store_mode >= STORE_AND_GROW_NO_TRANSITION && |
| store_mode <= STORE_AND_GROW_TRANSITION_TO_DOUBLE; |
| } |
| |
| |
| enum IcCheckType { ELEMENT, PROPERTY }; |
| |
| |
| // SKIP_WRITE_BARRIER skips the write barrier. |
| // UPDATE_WEAK_WRITE_BARRIER skips the marking part of the write barrier and |
| // only performs the generational part. |
| // UPDATE_WRITE_BARRIER is doing the full barrier, marking and generational. |
| enum WriteBarrierMode { |
| SKIP_WRITE_BARRIER, |
| UPDATE_WEAK_WRITE_BARRIER, |
| UPDATE_WRITE_BARRIER |
| }; |
| |
| |
| // Indicates whether a value can be loaded as a constant. |
| enum StoreMode { ALLOW_IN_DESCRIPTOR, FORCE_FIELD }; |
| |
| |
| // PropertyNormalizationMode is used to specify whether to keep |
| // inobject properties when normalizing properties of a JSObject. |
| enum PropertyNormalizationMode { |
| CLEAR_INOBJECT_PROPERTIES, |
| KEEP_INOBJECT_PROPERTIES |
| }; |
| |
| |
| // Indicates how aggressively the prototype should be optimized. FAST_PROTOTYPE |
| // will give the fastest result by tailoring the map to the prototype, but that |
| // will cause polymorphism with other objects. REGULAR_PROTOTYPE is to be used |
| // (at least for now) when dynamically modifying the prototype chain of an |
| // object using __proto__ or Object.setPrototypeOf. |
| enum PrototypeOptimizationMode { REGULAR_PROTOTYPE, FAST_PROTOTYPE }; |
| |
| |
| // Indicates whether transitions can be added to a source map or not. |
| enum TransitionFlag { |
| INSERT_TRANSITION, |
| OMIT_TRANSITION |
| }; |
| |
| |
| // Indicates whether the transition is simple: the target map of the transition |
| // either extends the current map with a new property, or it modifies the |
| // property that was added last to the current map. |
| enum SimpleTransitionFlag { |
| SIMPLE_PROPERTY_TRANSITION, |
| PROPERTY_TRANSITION, |
| SPECIAL_TRANSITION |
| }; |
| |
| |
| // Indicates whether we are only interested in the descriptors of a particular |
| // map, or in all descriptors in the descriptor array. |
| enum DescriptorFlag { |
| ALL_DESCRIPTORS, |
| OWN_DESCRIPTORS |
| }; |
| |
| // The GC maintains a bit of information, the MarkingParity, which toggles |
| // from odd to even and back every time marking is completed. Incremental |
| // marking can visit an object twice during a marking phase, so algorithms that |
| // that piggy-back on marking can use the parity to ensure that they only |
| // perform an operation on an object once per marking phase: they record the |
| // MarkingParity when they visit an object, and only re-visit the object when it |
| // is marked again and the MarkingParity changes. |
| enum MarkingParity { |
| NO_MARKING_PARITY, |
| ODD_MARKING_PARITY, |
| EVEN_MARKING_PARITY |
| }; |
| |
| // ICs store extra state in a Code object. The default extra state is |
| // kNoExtraICState. |
| typedef int ExtraICState; |
| static const ExtraICState kNoExtraICState = 0; |
| |
| // Instance size sentinel for objects of variable size. |
| const int kVariableSizeSentinel = 0; |
| |
| // We may store the unsigned bit field as signed Smi value and do not |
| // use the sign bit. |
| const int kStubMajorKeyBits = 8; |
| const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1; |
| |
| // All Maps have a field instance_type containing a InstanceType. |
| // It describes the type of the instances. |
| // |
| // As an example, a JavaScript object is a heap object and its map |
| // instance_type is JS_OBJECT_TYPE. |
| // |
| // The names of the string instance types are intended to systematically |
| // mirror their encoding in the instance_type field of the map. The default |
| // encoding is considered TWO_BYTE. It is not mentioned in the name. ONE_BYTE |
| // encoding is mentioned explicitly in the name. Likewise, the default |
| // representation is considered sequential. It is not mentioned in the |
| // name. The other representations (e.g. CONS, EXTERNAL) are explicitly |
| // mentioned. Finally, the string is either a STRING_TYPE (if it is a normal |
| // string) or a INTERNALIZED_STRING_TYPE (if it is a internalized string). |
| // |
| // NOTE: The following things are some that depend on the string types having |
| // instance_types that are less than those of all other types: |
| // HeapObject::Size, HeapObject::IterateBody, the typeof operator, and |
| // Object::IsString. |
| // |
| // NOTE: Everything following JS_VALUE_TYPE is considered a |
| // JSObject for GC purposes. The first four entries here have typeof |
| // 'object', whereas JS_FUNCTION_TYPE has typeof 'function'. |
| #define INSTANCE_TYPE_LIST(V) \ |
| V(STRING_TYPE) \ |
| V(ONE_BYTE_STRING_TYPE) \ |
| V(CONS_STRING_TYPE) \ |
| V(CONS_ONE_BYTE_STRING_TYPE) \ |
| V(SLICED_STRING_TYPE) \ |
| V(SLICED_ONE_BYTE_STRING_TYPE) \ |
| V(EXTERNAL_STRING_TYPE) \ |
| V(EXTERNAL_ONE_BYTE_STRING_TYPE) \ |
| V(EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| V(SHORT_EXTERNAL_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| \ |
| V(INTERNALIZED_STRING_TYPE) \ |
| V(ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE) \ |
| \ |
| V(SYMBOL_TYPE) \ |
| V(SIMD128_VALUE_TYPE) \ |
| \ |
| V(MAP_TYPE) \ |
| V(CODE_TYPE) \ |
| V(ODDBALL_TYPE) \ |
| V(CELL_TYPE) \ |
| V(PROPERTY_CELL_TYPE) \ |
| \ |
| V(HEAP_NUMBER_TYPE) \ |
| V(MUTABLE_HEAP_NUMBER_TYPE) \ |
| V(FOREIGN_TYPE) \ |
| V(BYTE_ARRAY_TYPE) \ |
| V(BYTECODE_ARRAY_TYPE) \ |
| V(FREE_SPACE_TYPE) \ |
| \ |
| V(FIXED_INT8_ARRAY_TYPE) \ |
| V(FIXED_UINT8_ARRAY_TYPE) \ |
| V(FIXED_INT16_ARRAY_TYPE) \ |
| V(FIXED_UINT16_ARRAY_TYPE) \ |
| V(FIXED_INT32_ARRAY_TYPE) \ |
| V(FIXED_UINT32_ARRAY_TYPE) \ |
| V(FIXED_FLOAT32_ARRAY_TYPE) \ |
| V(FIXED_FLOAT64_ARRAY_TYPE) \ |
| V(FIXED_UINT8_CLAMPED_ARRAY_TYPE) \ |
| \ |
| V(FILLER_TYPE) \ |
| \ |
| V(ACCESSOR_INFO_TYPE) \ |
| V(ACCESSOR_PAIR_TYPE) \ |
| V(ACCESS_CHECK_INFO_TYPE) \ |
| V(INTERCEPTOR_INFO_TYPE) \ |
| V(CALL_HANDLER_INFO_TYPE) \ |
| V(FUNCTION_TEMPLATE_INFO_TYPE) \ |
| V(OBJECT_TEMPLATE_INFO_TYPE) \ |
| V(SIGNATURE_INFO_TYPE) \ |
| V(TYPE_SWITCH_INFO_TYPE) \ |
| V(ALLOCATION_MEMENTO_TYPE) \ |
| V(ALLOCATION_SITE_TYPE) \ |
| V(SCRIPT_TYPE) \ |
| V(TYPE_FEEDBACK_INFO_TYPE) \ |
| V(ALIASED_ARGUMENTS_ENTRY_TYPE) \ |
| V(BOX_TYPE) \ |
| V(PROTOTYPE_INFO_TYPE) \ |
| V(SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE) \ |
| \ |
| V(FIXED_ARRAY_TYPE) \ |
| V(FIXED_DOUBLE_ARRAY_TYPE) \ |
| V(SHARED_FUNCTION_INFO_TYPE) \ |
| V(WEAK_CELL_TYPE) \ |
| V(TRANSITION_ARRAY_TYPE) \ |
| \ |
| V(JS_MESSAGE_OBJECT_TYPE) \ |
| \ |
| V(JS_VALUE_TYPE) \ |
| V(JS_DATE_TYPE) \ |
| V(JS_OBJECT_TYPE) \ |
| V(JS_ARGUMENTS_TYPE) \ |
| V(JS_CONTEXT_EXTENSION_OBJECT_TYPE) \ |
| V(JS_GENERATOR_OBJECT_TYPE) \ |
| V(JS_MODULE_TYPE) \ |
| V(JS_GLOBAL_OBJECT_TYPE) \ |
| V(JS_GLOBAL_PROXY_TYPE) \ |
| V(JS_API_OBJECT_TYPE) \ |
| V(JS_SPECIAL_API_OBJECT_TYPE) \ |
| V(JS_ARRAY_TYPE) \ |
| V(JS_ARRAY_BUFFER_TYPE) \ |
| V(JS_TYPED_ARRAY_TYPE) \ |
| V(JS_DATA_VIEW_TYPE) \ |
| V(JS_PROXY_TYPE) \ |
| V(JS_SET_TYPE) \ |
| V(JS_MAP_TYPE) \ |
| V(JS_SET_ITERATOR_TYPE) \ |
| V(JS_MAP_ITERATOR_TYPE) \ |
| V(JS_WEAK_MAP_TYPE) \ |
| V(JS_WEAK_SET_TYPE) \ |
| V(JS_PROMISE_TYPE) \ |
| V(JS_REGEXP_TYPE) \ |
| V(JS_ERROR_TYPE) \ |
| \ |
| V(JS_BOUND_FUNCTION_TYPE) \ |
| V(JS_FUNCTION_TYPE) \ |
| V(DEBUG_INFO_TYPE) \ |
| V(BREAK_POINT_INFO_TYPE) |
| |
| // Since string types are not consecutive, this macro is used to |
| // iterate over them. |
| #define STRING_TYPE_LIST(V) \ |
| V(STRING_TYPE, kVariableSizeSentinel, string, String) \ |
| V(ONE_BYTE_STRING_TYPE, kVariableSizeSentinel, one_byte_string, \ |
| OneByteString) \ |
| V(CONS_STRING_TYPE, ConsString::kSize, cons_string, ConsString) \ |
| V(CONS_ONE_BYTE_STRING_TYPE, ConsString::kSize, cons_one_byte_string, \ |
| ConsOneByteString) \ |
| V(SLICED_STRING_TYPE, SlicedString::kSize, sliced_string, SlicedString) \ |
| V(SLICED_ONE_BYTE_STRING_TYPE, SlicedString::kSize, sliced_one_byte_string, \ |
| SlicedOneByteString) \ |
| V(EXTERNAL_STRING_TYPE, ExternalTwoByteString::kSize, external_string, \ |
| ExternalString) \ |
| V(EXTERNAL_ONE_BYTE_STRING_TYPE, ExternalOneByteString::kSize, \ |
| external_one_byte_string, ExternalOneByteString) \ |
| V(EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE, ExternalTwoByteString::kSize, \ |
| external_string_with_one_byte_data, ExternalStringWithOneByteData) \ |
| V(SHORT_EXTERNAL_STRING_TYPE, ExternalTwoByteString::kShortSize, \ |
| short_external_string, ShortExternalString) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE, ExternalOneByteString::kShortSize, \ |
| short_external_one_byte_string, ShortExternalOneByteString) \ |
| V(SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kShortSize, \ |
| short_external_string_with_one_byte_data, \ |
| ShortExternalStringWithOneByteData) \ |
| \ |
| V(INTERNALIZED_STRING_TYPE, kVariableSizeSentinel, internalized_string, \ |
| InternalizedString) \ |
| V(ONE_BYTE_INTERNALIZED_STRING_TYPE, kVariableSizeSentinel, \ |
| one_byte_internalized_string, OneByteInternalizedString) \ |
| V(EXTERNAL_INTERNALIZED_STRING_TYPE, ExternalTwoByteString::kSize, \ |
| external_internalized_string, ExternalInternalizedString) \ |
| V(EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE, ExternalOneByteString::kSize, \ |
| external_one_byte_internalized_string, ExternalOneByteInternalizedString) \ |
| V(EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kSize, \ |
| external_internalized_string_with_one_byte_data, \ |
| ExternalInternalizedStringWithOneByteData) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE, \ |
| ExternalTwoByteString::kShortSize, short_external_internalized_string, \ |
| ShortExternalInternalizedString) \ |
| V(SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE, \ |
| ExternalOneByteString::kShortSize, \ |
| short_external_one_byte_internalized_string, \ |
| ShortExternalOneByteInternalizedString) \ |
| V(SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE, \ |
| ExternalTwoByteString::kShortSize, \ |
| short_external_internalized_string_with_one_byte_data, \ |
| ShortExternalInternalizedStringWithOneByteData) |
| |
| // A struct is a simple object a set of object-valued fields. Including an |
| // object type in this causes the compiler to generate most of the boilerplate |
| // code for the class including allocation and garbage collection routines, |
| // casts and predicates. All you need to define is the class, methods and |
| // object verification routines. Easy, no? |
| // |
| // Note that for subtle reasons related to the ordering or numerical values of |
| // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST |
| // manually. |
| #define STRUCT_LIST(V) \ |
| V(BOX, Box, box) \ |
| V(ACCESSOR_INFO, AccessorInfo, accessor_info) \ |
| V(ACCESSOR_PAIR, AccessorPair, accessor_pair) \ |
| V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info) \ |
| V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info) \ |
| V(CALL_HANDLER_INFO, CallHandlerInfo, call_handler_info) \ |
| V(FUNCTION_TEMPLATE_INFO, FunctionTemplateInfo, function_template_info) \ |
| V(OBJECT_TEMPLATE_INFO, ObjectTemplateInfo, object_template_info) \ |
| V(SCRIPT, Script, script) \ |
| V(ALLOCATION_SITE, AllocationSite, allocation_site) \ |
| V(ALLOCATION_MEMENTO, AllocationMemento, allocation_memento) \ |
| V(TYPE_FEEDBACK_INFO, TypeFeedbackInfo, type_feedback_info) \ |
| V(ALIASED_ARGUMENTS_ENTRY, AliasedArgumentsEntry, aliased_arguments_entry) \ |
| V(DEBUG_INFO, DebugInfo, debug_info) \ |
| V(BREAK_POINT_INFO, BreakPointInfo, break_point_info) \ |
| V(PROTOTYPE_INFO, PrototypeInfo, prototype_info) \ |
| V(SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION, \ |
| SloppyBlockWithEvalContextExtension, \ |
| sloppy_block_with_eval_context_extension) |
| |
| // We use the full 8 bits of the instance_type field to encode heap object |
| // instance types. The high-order bit (bit 7) is set if the object is not a |
| // string, and cleared if it is a string. |
| const uint32_t kIsNotStringMask = 0x80; |
| const uint32_t kStringTag = 0x0; |
| const uint32_t kNotStringTag = 0x80; |
| |
| // Bit 6 indicates that the object is an internalized string (if set) or not. |
| // Bit 7 has to be clear as well. |
| const uint32_t kIsNotInternalizedMask = 0x40; |
| const uint32_t kNotInternalizedTag = 0x40; |
| const uint32_t kInternalizedTag = 0x0; |
| |
| // If bit 7 is clear then bit 2 indicates whether the string consists of |
| // two-byte characters or one-byte characters. |
| const uint32_t kStringEncodingMask = 0x4; |
| const uint32_t kTwoByteStringTag = 0x0; |
| const uint32_t kOneByteStringTag = 0x4; |
| |
| // If bit 7 is clear, the low-order 2 bits indicate the representation |
| // of the string. |
| const uint32_t kStringRepresentationMask = 0x03; |
| enum StringRepresentationTag { |
| kSeqStringTag = 0x0, |
| kConsStringTag = 0x1, |
| kExternalStringTag = 0x2, |
| kSlicedStringTag = 0x3 |
| }; |
| const uint32_t kIsIndirectStringMask = 0x1; |
| const uint32_t kIsIndirectStringTag = 0x1; |
| STATIC_ASSERT((kSeqStringTag & kIsIndirectStringMask) == 0); // NOLINT |
| STATIC_ASSERT((kExternalStringTag & kIsIndirectStringMask) == 0); // NOLINT |
| STATIC_ASSERT((kConsStringTag & |
| kIsIndirectStringMask) == kIsIndirectStringTag); // NOLINT |
| STATIC_ASSERT((kSlicedStringTag & |
| kIsIndirectStringMask) == kIsIndirectStringTag); // NOLINT |
| |
| // Use this mask to distinguish between cons and slice only after making |
| // sure that the string is one of the two (an indirect string). |
| const uint32_t kSlicedNotConsMask = kSlicedStringTag & ~kConsStringTag; |
| STATIC_ASSERT(IS_POWER_OF_TWO(kSlicedNotConsMask)); |
| |
| // If bit 7 is clear, then bit 3 indicates whether this two-byte |
| // string actually contains one byte data. |
| const uint32_t kOneByteDataHintMask = 0x08; |
| const uint32_t kOneByteDataHintTag = 0x08; |
| |
| // If bit 7 is clear and string representation indicates an external string, |
| // then bit 4 indicates whether the data pointer is cached. |
| const uint32_t kShortExternalStringMask = 0x10; |
| const uint32_t kShortExternalStringTag = 0x10; |
| |
| |
| // A ConsString with an empty string as the right side is a candidate |
| // for being shortcut by the garbage collector. We don't allocate any |
| // non-flat internalized strings, so we do not shortcut them thereby |
| // avoiding turning internalized strings into strings. The bit-masks |
| // below contain the internalized bit as additional safety. |
| // See heap.cc, mark-compact.cc and objects-visiting.cc. |
| const uint32_t kShortcutTypeMask = |
| kIsNotStringMask | |
| kIsNotInternalizedMask | |
| kStringRepresentationMask; |
| const uint32_t kShortcutTypeTag = kConsStringTag | kNotInternalizedTag; |
| |
| static inline bool IsShortcutCandidate(int type) { |
| return ((type & kShortcutTypeMask) == kShortcutTypeTag); |
| } |
| |
| enum InstanceType { |
| // String types. |
| INTERNALIZED_STRING_TYPE = kTwoByteStringTag | kSeqStringTag | |
| kInternalizedTag, // FIRST_PRIMITIVE_TYPE |
| ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| kOneByteStringTag | kSeqStringTag | kInternalizedTag, |
| EXTERNAL_INTERNALIZED_STRING_TYPE = |
| kTwoByteStringTag | kExternalStringTag | kInternalizedTag, |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| kOneByteStringTag | kExternalStringTag | kInternalizedTag, |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_TYPE | kOneByteDataHintTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE = EXTERNAL_INTERNALIZED_STRING_TYPE | |
| kShortExternalStringTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE = |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kShortExternalStringTag | |
| kInternalizedTag, |
| SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kShortExternalStringTag | kInternalizedTag, |
| STRING_TYPE = INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| ONE_BYTE_STRING_TYPE = |
| ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag | kNotInternalizedTag, |
| CONS_ONE_BYTE_STRING_TYPE = |
| kOneByteStringTag | kConsStringTag | kNotInternalizedTag, |
| SLICED_STRING_TYPE = |
| kTwoByteStringTag | kSlicedStringTag | kNotInternalizedTag, |
| SLICED_ONE_BYTE_STRING_TYPE = |
| kOneByteStringTag | kSlicedStringTag | kNotInternalizedTag, |
| EXTERNAL_STRING_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| EXTERNAL_ONE_BYTE_STRING_TYPE = |
| EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kNotInternalizedTag, |
| SHORT_EXTERNAL_STRING_TYPE = |
| SHORT_EXTERNAL_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE = |
| SHORT_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE | kNotInternalizedTag, |
| SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE = |
| SHORT_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE | |
| kNotInternalizedTag, |
| |
| // Non-string names |
| SYMBOL_TYPE = kNotStringTag, // FIRST_NONSTRING_TYPE, LAST_NAME_TYPE |
| |
| // Other primitives (cannot contain non-map-word pointers to heap objects). |
| HEAP_NUMBER_TYPE, |
| SIMD128_VALUE_TYPE, |
| ODDBALL_TYPE, // LAST_PRIMITIVE_TYPE |
| |
| // Objects allocated in their own spaces (never in new space). |
| MAP_TYPE, |
| CODE_TYPE, |
| |
| // "Data", objects that cannot contain non-map-word pointers to heap |
| // objects. |
| MUTABLE_HEAP_NUMBER_TYPE, |
| FOREIGN_TYPE, |
| BYTE_ARRAY_TYPE, |
| BYTECODE_ARRAY_TYPE, |
| FREE_SPACE_TYPE, |
| FIXED_INT8_ARRAY_TYPE, // FIRST_FIXED_TYPED_ARRAY_TYPE |
| FIXED_UINT8_ARRAY_TYPE, |
| FIXED_INT16_ARRAY_TYPE, |
| FIXED_UINT16_ARRAY_TYPE, |
| FIXED_INT32_ARRAY_TYPE, |
| FIXED_UINT32_ARRAY_TYPE, |
| FIXED_FLOAT32_ARRAY_TYPE, |
| FIXED_FLOAT64_ARRAY_TYPE, |
| FIXED_UINT8_CLAMPED_ARRAY_TYPE, // LAST_FIXED_TYPED_ARRAY_TYPE |
| FIXED_DOUBLE_ARRAY_TYPE, |
| FILLER_TYPE, // LAST_DATA_TYPE |
| |
| // Structs. |
| ACCESSOR_INFO_TYPE, |
| ACCESSOR_PAIR_TYPE, |
| ACCESS_CHECK_INFO_TYPE, |
| INTERCEPTOR_INFO_TYPE, |
| CALL_HANDLER_INFO_TYPE, |
| FUNCTION_TEMPLATE_INFO_TYPE, |
| OBJECT_TEMPLATE_INFO_TYPE, |
| SIGNATURE_INFO_TYPE, |
| TYPE_SWITCH_INFO_TYPE, |
| ALLOCATION_SITE_TYPE, |
| ALLOCATION_MEMENTO_TYPE, |
| SCRIPT_TYPE, |
| TYPE_FEEDBACK_INFO_TYPE, |
| ALIASED_ARGUMENTS_ENTRY_TYPE, |
| BOX_TYPE, |
| DEBUG_INFO_TYPE, |
| BREAK_POINT_INFO_TYPE, |
| FIXED_ARRAY_TYPE, |
| SHARED_FUNCTION_INFO_TYPE, |
| CELL_TYPE, |
| WEAK_CELL_TYPE, |
| TRANSITION_ARRAY_TYPE, |
| PROPERTY_CELL_TYPE, |
| PROTOTYPE_INFO_TYPE, |
| SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE, |
| |
| // All the following types are subtypes of JSReceiver, which corresponds to |
| // objects in the JS sense. The first and the last type in this range are |
| // the two forms of function. This organization enables using the same |
| // compares for checking the JS_RECEIVER and the NONCALLABLE_JS_OBJECT range. |
| JS_PROXY_TYPE, // FIRST_JS_RECEIVER_TYPE |
| JS_GLOBAL_OBJECT_TYPE, // FIRST_JS_OBJECT_TYPE |
| JS_GLOBAL_PROXY_TYPE, |
| // Like JS_API_OBJECT_TYPE, but requires access checks and/or has |
| // interceptors. |
| JS_SPECIAL_API_OBJECT_TYPE, // LAST_SPECIAL_RECEIVER_TYPE |
| JS_VALUE_TYPE, // LAST_CUSTOM_ELEMENTS_RECEIVER |
| JS_MESSAGE_OBJECT_TYPE, |
| JS_DATE_TYPE, |
| // Like JS_OBJECT_TYPE, but created from API function. |
| JS_API_OBJECT_TYPE, |
| JS_OBJECT_TYPE, |
| JS_ARGUMENTS_TYPE, |
| JS_CONTEXT_EXTENSION_OBJECT_TYPE, |
| JS_GENERATOR_OBJECT_TYPE, |
| JS_MODULE_TYPE, |
| JS_ARRAY_TYPE, |
| JS_ARRAY_BUFFER_TYPE, |
| JS_TYPED_ARRAY_TYPE, |
| JS_DATA_VIEW_TYPE, |
| JS_SET_TYPE, |
| JS_MAP_TYPE, |
| JS_SET_ITERATOR_TYPE, |
| JS_MAP_ITERATOR_TYPE, |
| JS_WEAK_MAP_TYPE, |
| JS_WEAK_SET_TYPE, |
| JS_PROMISE_TYPE, |
| JS_REGEXP_TYPE, |
| JS_ERROR_TYPE, |
| JS_BOUND_FUNCTION_TYPE, |
| JS_FUNCTION_TYPE, // LAST_JS_OBJECT_TYPE, LAST_JS_RECEIVER_TYPE |
| |
| // Pseudo-types |
| FIRST_TYPE = 0x0, |
| LAST_TYPE = JS_FUNCTION_TYPE, |
| FIRST_NAME_TYPE = FIRST_TYPE, |
| LAST_NAME_TYPE = SYMBOL_TYPE, |
| FIRST_UNIQUE_NAME_TYPE = INTERNALIZED_STRING_TYPE, |
| LAST_UNIQUE_NAME_TYPE = SYMBOL_TYPE, |
| FIRST_NONSTRING_TYPE = SYMBOL_TYPE, |
| FIRST_PRIMITIVE_TYPE = FIRST_NAME_TYPE, |
| LAST_PRIMITIVE_TYPE = ODDBALL_TYPE, |
| FIRST_FUNCTION_TYPE = JS_BOUND_FUNCTION_TYPE, |
| LAST_FUNCTION_TYPE = JS_FUNCTION_TYPE, |
| // Boundaries for testing for a fixed typed array. |
| FIRST_FIXED_TYPED_ARRAY_TYPE = FIXED_INT8_ARRAY_TYPE, |
| LAST_FIXED_TYPED_ARRAY_TYPE = FIXED_UINT8_CLAMPED_ARRAY_TYPE, |
| // Boundary for promotion to old space. |
| LAST_DATA_TYPE = FILLER_TYPE, |
| // Boundary for objects represented as JSReceiver (i.e. JSObject or JSProxy). |
| // Note that there is no range for JSObject or JSProxy, since their subtypes |
| // are not continuous in this enum! The enum ranges instead reflect the |
| // external class names, where proxies are treated as either ordinary objects, |
| // or functions. |
| FIRST_JS_RECEIVER_TYPE = JS_PROXY_TYPE, |
| LAST_JS_RECEIVER_TYPE = LAST_TYPE, |
| // Boundaries for testing the types represented as JSObject |
| FIRST_JS_OBJECT_TYPE = JS_GLOBAL_OBJECT_TYPE, |
| LAST_JS_OBJECT_TYPE = LAST_TYPE, |
| // Boundary for testing JSReceivers that need special property lookup handling |
| LAST_SPECIAL_RECEIVER_TYPE = JS_SPECIAL_API_OBJECT_TYPE, |
| // Boundary case for testing JSReceivers that may have elements while having |
| // an empty fixed array as elements backing store. This is true for string |
| // wrappers. |
| LAST_CUSTOM_ELEMENTS_RECEIVER = JS_VALUE_TYPE, |
| }; |
| |
| STATIC_ASSERT(JS_OBJECT_TYPE == Internals::kJSObjectType); |
| STATIC_ASSERT(JS_API_OBJECT_TYPE == Internals::kJSApiObjectType); |
| STATIC_ASSERT(FIRST_NONSTRING_TYPE == Internals::kFirstNonstringType); |
| STATIC_ASSERT(ODDBALL_TYPE == Internals::kOddballType); |
| STATIC_ASSERT(FOREIGN_TYPE == Internals::kForeignType); |
| |
| |
| std::ostream& operator<<(std::ostream& os, InstanceType instance_type); |
| |
| #define FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(V) \ |
| V(BYTECODE_ARRAY_CONSTANT_POOL_SUB_TYPE) \ |
| V(BYTECODE_ARRAY_HANDLER_TABLE_SUB_TYPE) \ |
| V(CODE_STUBS_TABLE_SUB_TYPE) \ |
| V(COMPILATION_CACHE_TABLE_SUB_TYPE) \ |
| V(CONTEXT_SUB_TYPE) \ |
| V(COPY_ON_WRITE_SUB_TYPE) \ |
| V(DEOPTIMIZATION_DATA_SUB_TYPE) \ |
| V(DESCRIPTOR_ARRAY_SUB_TYPE) \ |
| V(EMBEDDED_OBJECT_SUB_TYPE) \ |
| V(ENUM_CACHE_SUB_TYPE) \ |
| V(ENUM_INDICES_CACHE_SUB_TYPE) \ |
| V(DEPENDENT_CODE_SUB_TYPE) \ |
| V(DICTIONARY_ELEMENTS_SUB_TYPE) \ |
| V(DICTIONARY_PROPERTIES_SUB_TYPE) \ |
| V(EMPTY_PROPERTIES_DICTIONARY_SUB_TYPE) \ |
| V(FAST_ELEMENTS_SUB_TYPE) \ |
| V(FAST_PROPERTIES_SUB_TYPE) \ |
| V(FAST_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE) \ |
| V(HANDLER_TABLE_SUB_TYPE) \ |
| V(INTRINSIC_FUNCTION_NAMES_SUB_TYPE) \ |
| V(JS_COLLECTION_SUB_TYPE) \ |
| V(JS_WEAK_COLLECTION_SUB_TYPE) \ |
| V(LITERALS_ARRAY_SUB_TYPE) \ |
| V(MAP_CODE_CACHE_SUB_TYPE) \ |
| V(NOSCRIPT_SHARED_FUNCTION_INFOS_SUB_TYPE) \ |
| V(NUMBER_STRING_CACHE_SUB_TYPE) \ |
| V(OBJECT_TO_CODE_SUB_TYPE) \ |
| V(OPTIMIZED_CODE_LITERALS_SUB_TYPE) \ |
| V(OPTIMIZED_CODE_MAP_SUB_TYPE) \ |
| V(PROTOTYPE_USERS_SUB_TYPE) \ |
| V(REGEXP_MULTIPLE_CACHE_SUB_TYPE) \ |
| V(RETAINED_MAPS_SUB_TYPE) \ |
| V(SCOPE_INFO_SUB_TYPE) \ |
| V(SCRIPT_LIST_SUB_TYPE) \ |
| V(SERIALIZED_TEMPLATES_SUB_TYPE) \ |
| V(SHARED_FUNCTION_INFOS_SUB_TYPE) \ |
| V(SINGLE_CHARACTER_STRING_CACHE_SUB_TYPE) \ |
| V(SLOW_TEMPLATE_INSTANTIATIONS_CACHE_SUB_TYPE) \ |
| V(STRING_SPLIT_CACHE_SUB_TYPE) \ |
| V(STRING_TABLE_SUB_TYPE) \ |
| V(TEMPLATE_INFO_SUB_TYPE) \ |
| V(TYPE_FEEDBACK_VECTOR_SUB_TYPE) \ |
| V(TYPE_FEEDBACK_METADATA_SUB_TYPE) \ |
| V(WEAK_NEW_SPACE_OBJECT_TO_CODE_SUB_TYPE) |
| |
| enum FixedArraySubInstanceType { |
| #define DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE(name) name, |
| FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE) |
| #undef DEFINE_FIXED_ARRAY_SUB_INSTANCE_TYPE |
| LAST_FIXED_ARRAY_SUB_TYPE = WEAK_NEW_SPACE_OBJECT_TO_CODE_SUB_TYPE |
| }; |
| |
| |
| // TODO(bmeurer): Remove this in favor of the ComparisonResult below. |
| enum CompareResult { |
| LESS = -1, |
| EQUAL = 0, |
| GREATER = 1, |
| |
| NOT_EQUAL = GREATER |
| }; |
| |
| |
| // Result of an abstract relational comparison of x and y, implemented according |
| // to ES6 section 7.2.11 Abstract Relational Comparison. |
| enum class ComparisonResult { |
| kLessThan, // x < y |
| kEqual, // x = y |
| kGreaterThan, // x > y |
| kUndefined // at least one of x or y was undefined or NaN |
| }; |
| |
| |
| #define DECL_BOOLEAN_ACCESSORS(name) \ |
| inline bool name() const; \ |
| inline void set_##name(bool value); |
| |
| #define DECL_INT_ACCESSORS(name) \ |
| inline int name() const; \ |
| inline void set_##name(int value); |
| |
| |
| #define DECL_ACCESSORS(name, type) \ |
| inline type* name() const; \ |
| inline void set_##name(type* value, \ |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); \ |
| |
| |
| #define DECLARE_CAST(type) \ |
| INLINE(static type* cast(Object* object)); \ |
| INLINE(static const type* cast(const Object* object)); |
| |
| class AbstractCode; |
| class AccessorPair; |
| class AllocationSite; |
| class AllocationSiteCreationContext; |
| class AllocationSiteUsageContext; |
| class Cell; |
| class ConsString; |
| class ElementsAccessor; |
| class FixedArrayBase; |
| class FunctionLiteral; |
| class JSGlobalObject; |
| class KeyAccumulator; |
| class LayoutDescriptor; |
| class LiteralsArray; |
| class LookupIterator; |
| class FieldType; |
| class ModuleDescriptor; |
| class ModuleInfo; |
| class ObjectHashTable; |
| class ObjectVisitor; |
| class PropertyCell; |
| class PropertyDescriptor; |
| class SafepointEntry; |
| class SharedFunctionInfo; |
| class StringStream; |
| class TypeFeedbackInfo; |
| class TypeFeedbackMetadata; |
| class TypeFeedbackVector; |
| class WeakCell; |
| class TransitionArray; |
| class TemplateList; |
| |
| // A template-ized version of the IsXXX functions. |
| template <class C> inline bool Is(Object* obj); |
| |
| #ifdef VERIFY_HEAP |
| #define DECLARE_VERIFIER(Name) void Name##Verify(); |
| #else |
| #define DECLARE_VERIFIER(Name) |
| #endif |
| |
| #ifdef OBJECT_PRINT |
| #define DECLARE_PRINTER(Name) void Name##Print(std::ostream& os); // NOLINT |
| #else |
| #define DECLARE_PRINTER(Name) |
| #endif |
| |
| #define OBJECT_TYPE_LIST(V) \ |
| V(Smi) \ |
| V(LayoutDescriptor) \ |
| V(HeapObject) \ |
| V(Primitive) \ |
| V(Number) |
| |
| #define HEAP_OBJECT_TYPE_LIST(V) \ |
| V(HeapNumber) \ |
| V(MutableHeapNumber) \ |
| V(Simd128Value) \ |
| V(Float32x4) \ |
| V(Int32x4) \ |
| V(Uint32x4) \ |
| V(Bool32x4) \ |
| V(Int16x8) \ |
| V(Uint16x8) \ |
| V(Bool16x8) \ |
| V(Int8x16) \ |
| V(Uint8x16) \ |
| V(Bool8x16) \ |
| V(Name) \ |
| V(UniqueName) \ |
| V(String) \ |
| V(SeqString) \ |
| V(ExternalString) \ |
| V(ConsString) \ |
| V(SlicedString) \ |
| V(ExternalTwoByteString) \ |
| V(ExternalOneByteString) \ |
| V(SeqTwoByteString) \ |
| V(SeqOneByteString) \ |
| V(InternalizedString) \ |
| V(Symbol) \ |
| \ |
| V(FixedTypedArrayBase) \ |
| V(FixedUint8Array) \ |
| V(FixedInt8Array) \ |
| V(FixedUint16Array) \ |
| V(FixedInt16Array) \ |
| V(FixedUint32Array) \ |
| V(FixedInt32Array) \ |
| V(FixedFloat32Array) \ |
| V(FixedFloat64Array) \ |
| V(FixedUint8ClampedArray) \ |
| V(ByteArray) \ |
| V(BytecodeArray) \ |
| V(FreeSpace) \ |
| V(JSReceiver) \ |
| V(JSObject) \ |
| V(JSContextExtensionObject) \ |
| V(JSGeneratorObject) \ |
| V(Map) \ |
| V(DescriptorArray) \ |
| V(FrameArray) \ |
| V(TransitionArray) \ |
| V(LiteralsArray) \ |
| V(TypeFeedbackMetadata) \ |
| V(TypeFeedbackVector) \ |
| V(DeoptimizationInputData) \ |
| V(DeoptimizationOutputData) \ |
| V(DependentCode) \ |
| V(HandlerTable) \ |
| V(FixedArray) \ |
| V(FixedDoubleArray) \ |
| V(WeakFixedArray) \ |
| V(ArrayList) \ |
| V(Context) \ |
| V(ScriptContextTable) \ |
| V(NativeContext) \ |
| V(ScopeInfo) \ |
| V(ModuleInfo) \ |
| V(JSBoundFunction) \ |
| V(JSFunction) \ |
| V(Code) \ |
| V(AbstractCode) \ |
| V(Oddball) \ |
| V(SharedFunctionInfo) \ |
| V(JSValue) \ |
| V(JSDate) \ |
| V(JSMessageObject) \ |
| V(StringWrapper) \ |
| V(Foreign) \ |
| V(Boolean) \ |
| V(JSArray) \ |
| V(JSArrayBuffer) \ |
| V(JSArrayBufferView) \ |
| V(JSCollection) \ |
| V(JSTypedArray) \ |
| V(JSDataView) \ |
| V(JSProxy) \ |
| V(JSError) \ |
| V(JSPromise) \ |
| V(JSSet) \ |
| V(JSMap) \ |
| V(JSSetIterator) \ |
| V(JSMapIterator) \ |
| V(JSWeakCollection) \ |
| V(JSWeakMap) \ |
| V(JSWeakSet) \ |
| V(JSRegExp) \ |
| V(HashTable) \ |
| V(Dictionary) \ |
| V(UnseededNumberDictionary) \ |
| V(StringTable) \ |
| V(StringSet) \ |
| V(NormalizedMapCache) \ |
| V(CompilationCacheTable) \ |
| V(CodeCacheHashTable) \ |
| V(MapCache) \ |
| V(JSGlobalObject) \ |
| V(JSGlobalProxy) \ |
| V(Undetectable) \ |
| V(AccessCheckNeeded) \ |
| V(Callable) \ |
| V(Function) \ |
| V(Constructor) \ |
| V(TemplateInfo) \ |
| V(Filler) \ |
| V(FixedArrayBase) \ |
| V(External) \ |
| V(Struct) \ |
| V(Cell) \ |
| V(TemplateList) \ |
| V(PropertyCell) \ |
| V(WeakCell) \ |
| V(ObjectHashTable) \ |
| V(ObjectHashSet) \ |
| V(WeakHashTable) \ |
| V(OrderedHashTable) |
| |
| #define ODDBALL_LIST(V) \ |
| V(Undefined, undefined_value) \ |
| V(Null, null_value) \ |
| V(TheHole, the_hole_value) \ |
| V(Exception, exception) \ |
| V(Uninitialized, uninitialized_value) \ |
| V(True, true_value) \ |
| V(False, false_value) \ |
| V(ArgumentsMarker, arguments_marker) \ |
| V(OptimizedOut, optimized_out) \ |
| V(StaleRegister, stale_register) |
| |
| // The element types selection for CreateListFromArrayLike. |
| enum class ElementTypes { kAll, kStringAndSymbol }; |
| |
| // Object is the abstract superclass for all classes in the |
| // object hierarchy. |
| // Object does not use any virtual functions to avoid the |
| // allocation of the C++ vtable. |
| // Since both Smi and HeapObject are subclasses of Object no |
| // data members can be present in Object. |
| class Object { |
| public: |
| // Type testing. |
| bool IsObject() const { return true; } |
| |
| #define IS_TYPE_FUNCTION_DECL(Type) INLINE(bool Is##Type() const); |
| OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| #define IS_TYPE_FUNCTION_DECL(Type, Value) \ |
| INLINE(bool Is##Type(Isolate* isolate) const); |
| ODDBALL_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| // A non-keyed store is of the form a.x = foo or a["x"] = foo whereas |
| // a keyed store is of the form a[expression] = foo. |
| enum StoreFromKeyed { |
| MAY_BE_STORE_FROM_KEYED, |
| CERTAINLY_NOT_STORE_FROM_KEYED |
| }; |
| |
| enum ShouldThrow { THROW_ON_ERROR, DONT_THROW }; |
| |
| #define RETURN_FAILURE(isolate, should_throw, call) \ |
| do { \ |
| if ((should_throw) == DONT_THROW) { \ |
| return Just(false); \ |
| } else { \ |
| isolate->Throw(*isolate->factory()->call); \ |
| return Nothing<bool>(); \ |
| } \ |
| } while (false) |
| |
| #define MAYBE_RETURN(call, value) \ |
| do { \ |
| if ((call).IsNothing()) return value; \ |
| } while (false) |
| |
| #define MAYBE_RETURN_NULL(call) MAYBE_RETURN(call, MaybeHandle<Object>()) |
| |
| #define DECLARE_STRUCT_PREDICATE(NAME, Name, name) \ |
| INLINE(bool Is##Name() const); |
| STRUCT_LIST(DECLARE_STRUCT_PREDICATE) |
| #undef DECLARE_STRUCT_PREDICATE |
| |
| // ES6, section 7.2.2 IsArray. NOT to be confused with %_IsArray. |
| MUST_USE_RESULT static Maybe<bool> IsArray(Handle<Object> object); |
| |
| INLINE(bool IsNameDictionary() const); |
| INLINE(bool IsGlobalDictionary() const); |
| INLINE(bool IsSeededNumberDictionary() const); |
| INLINE(bool IsOrderedHashSet() const); |
| INLINE(bool IsOrderedHashMap() const); |
| |
| // Extract the number. |
| inline double Number() const; |
| INLINE(bool IsNaN() const); |
| INLINE(bool IsMinusZero() const); |
| bool ToInt32(int32_t* value); |
| inline bool ToUint32(uint32_t* value); |
| |
| inline Representation OptimalRepresentation(); |
| |
| inline ElementsKind OptimalElementsKind(); |
| |
| inline bool FitsRepresentation(Representation representation); |
| |
| // Checks whether two valid primitive encodings of a property name resolve to |
| // the same logical property. E.g., the smi 1, the string "1" and the double |
| // 1 all refer to the same property, so this helper will return true. |
| inline bool KeyEquals(Object* other); |
| |
| inline bool FilterKey(PropertyFilter filter); |
| |
| Handle<FieldType> OptimalType(Isolate* isolate, |
| Representation representation); |
| |
| inline static Handle<Object> NewStorageFor(Isolate* isolate, |
| Handle<Object> object, |
| Representation representation); |
| |
| inline static Handle<Object> WrapForRead(Isolate* isolate, |
| Handle<Object> object, |
| Representation representation); |
| |
| // Returns true if the object is of the correct type to be used as a |
| // implementation of a JSObject's elements. |
| inline bool HasValidElements(); |
| |
| inline bool HasSpecificClassOf(String* name); |
| |
| bool BooleanValue(); // ECMA-262 9.2. |
| |
| // ES6 section 7.2.11 Abstract Relational Comparison |
| MUST_USE_RESULT static Maybe<ComparisonResult> Compare(Handle<Object> x, |
| Handle<Object> y); |
| |
| // ES6 section 7.2.12 Abstract Equality Comparison |
| MUST_USE_RESULT static Maybe<bool> Equals(Handle<Object> x, Handle<Object> y); |
| |
| // ES6 section 7.2.13 Strict Equality Comparison |
| bool StrictEquals(Object* that); |
| |
| // Convert to a JSObject if needed. |
| // native_context is used when creating wrapper object. |
| MUST_USE_RESULT static inline MaybeHandle<JSReceiver> ToObject( |
| Isolate* isolate, Handle<Object> object); |
| MUST_USE_RESULT static MaybeHandle<JSReceiver> ToObject( |
| Isolate* isolate, Handle<Object> object, Handle<Context> context); |
| |
| // ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee. |
| MUST_USE_RESULT static MaybeHandle<JSReceiver> ConvertReceiver( |
| Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 7.1.14 ToPropertyKey |
| MUST_USE_RESULT static inline MaybeHandle<Name> ToName(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.1 ToPrimitive |
| MUST_USE_RESULT static inline MaybeHandle<Object> ToPrimitive( |
| Handle<Object> input, ToPrimitiveHint hint = ToPrimitiveHint::kDefault); |
| |
| // ES6 section 7.1.3 ToNumber |
| MUST_USE_RESULT static MaybeHandle<Object> ToNumber(Handle<Object> input); |
| |
| // ES6 section 7.1.4 ToInteger |
| MUST_USE_RESULT static MaybeHandle<Object> ToInteger(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.5 ToInt32 |
| MUST_USE_RESULT static MaybeHandle<Object> ToInt32(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.6 ToUint32 |
| MUST_USE_RESULT static MaybeHandle<Object> ToUint32(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.12 ToString |
| MUST_USE_RESULT static MaybeHandle<String> ToString(Isolate* isolate, |
| Handle<Object> input); |
| |
| static Handle<String> NoSideEffectsToString(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.14 ToPropertyKey |
| MUST_USE_RESULT static MaybeHandle<Object> ToPropertyKey( |
| Isolate* isolate, Handle<Object> value); |
| |
| // ES6 section 7.1.15 ToLength |
| MUST_USE_RESULT static MaybeHandle<Object> ToLength(Isolate* isolate, |
| Handle<Object> input); |
| |
| // ES6 section 7.1.17 ToIndex |
| MUST_USE_RESULT static MaybeHandle<Object> ToIndex( |
| Isolate* isolate, Handle<Object> input, |
| MessageTemplate::Template error_index); |
| |
| // ES6 section 7.3.9 GetMethod |
| MUST_USE_RESULT static MaybeHandle<Object> GetMethod( |
| Handle<JSReceiver> receiver, Handle<Name> name); |
| |
| // ES6 section 7.3.17 CreateListFromArrayLike |
| MUST_USE_RESULT static MaybeHandle<FixedArray> CreateListFromArrayLike( |
| Isolate* isolate, Handle<Object> object, ElementTypes element_types); |
| |
| // Get length property and apply ToLength. |
| MUST_USE_RESULT static MaybeHandle<Object> GetLengthFromArrayLike( |
| Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 12.5.6 The typeof Operator |
| static Handle<String> TypeOf(Isolate* isolate, Handle<Object> object); |
| |
| // ES6 section 12.6 Multiplicative Operators |
| MUST_USE_RESULT static MaybeHandle<Object> Multiply(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Divide(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Modulus(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 12.7 Additive Operators |
| MUST_USE_RESULT static MaybeHandle<Object> Add(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> Subtract(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 12.8 Bitwise Shift Operators |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftLeft(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftRight(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> ShiftRightLogical( |
| Isolate* isolate, Handle<Object> lhs, Handle<Object> rhs); |
| |
| // ES6 section 12.9 Relational Operators |
| MUST_USE_RESULT static inline Maybe<bool> GreaterThan(Handle<Object> x, |
| Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> GreaterThanOrEqual( |
| Handle<Object> x, Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> LessThan(Handle<Object> x, |
| Handle<Object> y); |
| MUST_USE_RESULT static inline Maybe<bool> LessThanOrEqual(Handle<Object> x, |
| Handle<Object> y); |
| |
| // ES6 section 12.11 Binary Bitwise Operators |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseAnd(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseOr(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| MUST_USE_RESULT static MaybeHandle<Object> BitwiseXor(Isolate* isolate, |
| Handle<Object> lhs, |
| Handle<Object> rhs); |
| |
| // ES6 section 7.3.19 OrdinaryHasInstance (C, O). |
| MUST_USE_RESULT static MaybeHandle<Object> OrdinaryHasInstance( |
| Isolate* isolate, Handle<Object> callable, Handle<Object> object); |
| |
| // ES6 section 12.10.4 Runtime Semantics: InstanceofOperator(O, C) |
| MUST_USE_RESULT static MaybeHandle<Object> InstanceOf( |
| Isolate* isolate, Handle<Object> object, Handle<Object> callable); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> GetProperty(LookupIterator* it); |
| |
| // ES6 [[Set]] (when passed DONT_THROW) |
| // Invariants for this and related functions (unless stated otherwise): |
| // 1) When the result is Nothing, an exception is pending. |
| // 2) When passed THROW_ON_ERROR, the result is never Just(false). |
| // In some cases, an exception is thrown regardless of the ShouldThrow |
| // argument. These cases are either in accordance with the spec or not |
| // covered by it (eg., concerning API callbacks). |
| MUST_USE_RESULT static Maybe<bool> SetProperty(LookupIterator* it, |
| Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode); |
| MUST_USE_RESULT static MaybeHandle<Object> SetProperty( |
| Handle<Object> object, Handle<Name> name, Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED); |
| MUST_USE_RESULT static inline MaybeHandle<Object> SetPropertyOrElement( |
| Handle<Object> object, Handle<Name> name, Handle<Object> value, |
| LanguageMode language_mode, |
| StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED); |
| |
| MUST_USE_RESULT static Maybe<bool> SetSuperProperty( |
| LookupIterator* it, Handle<Object> value, LanguageMode language_mode, |
| StoreFromKeyed store_mode); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> ReadAbsentProperty( |
| LookupIterator* it); |
| MUST_USE_RESULT static MaybeHandle<Object> ReadAbsentProperty( |
| Isolate* isolate, Handle<Object> receiver, Handle<Object> name); |
| MUST_USE_RESULT static Maybe<bool> CannotCreateProperty( |
| Isolate* isolate, Handle<Object> receiver, Handle<Object> name, |
| Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> WriteToReadOnlyProperty( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> WriteToReadOnlyProperty( |
| Isolate* isolate, Handle<Object> receiver, Handle<Object> name, |
| Handle<Object> value, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> RedefineIncompatibleProperty( |
| Isolate* isolate, Handle<Object> name, Handle<Object> value, |
| ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> SetDataProperty(LookupIterator* it, |
| Handle<Object> value); |
| MUST_USE_RESULT static Maybe<bool> AddDataProperty( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| ShouldThrow should_throw, StoreFromKeyed store_mode); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement( |
| Handle<Object> object, Handle<Name> name); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement( |
| Handle<Object> receiver, Handle<Name> name, Handle<JSReceiver> holder); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Handle<Object> object, Handle<Name> name); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithAccessor( |
| LookupIterator* it); |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithAccessor( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithDefinedGetter( |
| Handle<Object> receiver, |
| Handle<JSReceiver> getter); |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithDefinedSetter( |
| Handle<Object> receiver, Handle<JSReceiver> setter, Handle<Object> value, |
| ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetElement( |
| Isolate* isolate, Handle<Object> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> SetElement( |
| Isolate* isolate, Handle<Object> object, uint32_t index, |
| Handle<Object> value, LanguageMode language_mode); |
| |
| // Returns the permanent hash code associated with this object. May return |
| // undefined if not yet created. |
| Object* GetHash(); |
| |
| // Returns the permanent hash code associated with this object depending on |
| // the actual object type. May create and store a hash code if needed and none |
| // exists. |
| static Smi* GetOrCreateHash(Isolate* isolate, Handle<Object> object); |
| |
| // Checks whether this object has the same value as the given one. This |
| // function is implemented according to ES5, section 9.12 and can be used |
| // to implement the Harmony "egal" function. |
| bool SameValue(Object* other); |
| |
| // Checks whether this object has the same value as the given one. |
| // +0 and -0 are treated equal. Everything else is the same as SameValue. |
| // This function is implemented according to ES6, section 7.2.4 and is used |
| // by ES6 Map and Set. |
| bool SameValueZero(Object* other); |
| |
| // ES6 section 9.4.2.3 ArraySpeciesCreate (part of it) |
| MUST_USE_RESULT static MaybeHandle<Object> ArraySpeciesConstructor( |
| Isolate* isolate, Handle<Object> original_array); |
| |
| // Tries to convert an object to an array length. Returns true and sets the |
| // output parameter if it succeeds. |
| inline bool ToArrayLength(uint32_t* index); |
| |
| // Tries to convert an object to an array index. Returns true and sets the |
| // output parameter if it succeeds. Equivalent to ToArrayLength, but does not |
| // allow kMaxUInt32. |
| inline bool ToArrayIndex(uint32_t* index); |
| |
| DECLARE_VERIFIER(Object) |
| #ifdef VERIFY_HEAP |
| // Verify a pointer is a valid object pointer. |
| static void VerifyPointer(Object* p); |
| #endif |
| |
| inline void VerifyApiCallResultType(); |
| |
| // ES6 19.1.3.6 Object.prototype.toString |
| MUST_USE_RESULT static MaybeHandle<String> ObjectProtoToString( |
| Isolate* isolate, Handle<Object> object); |
| |
| // Prints this object without details. |
| void ShortPrint(FILE* out = stdout); |
| |
| // Prints this object without details to a message accumulator. |
| void ShortPrint(StringStream* accumulator); |
| |
| void ShortPrint(std::ostream& os); // NOLINT |
| |
| DECLARE_CAST(Object) |
| |
| // Layout description. |
| static const int kHeaderSize = 0; // Object does not take up any space. |
| |
| #ifdef OBJECT_PRINT |
| // For our gdb macros, we should perhaps change these in the future. |
| void Print(); |
| |
| // Prints this object with details. |
| void Print(std::ostream& os); // NOLINT |
| #else |
| void Print() { ShortPrint(); } |
| void Print(std::ostream& os) { ShortPrint(os); } // NOLINT |
| #endif |
| |
| private: |
| friend class LookupIterator; |
| friend class StringStream; |
| |
| // Return the map of the root of object's prototype chain. |
| Map* GetRootMap(Isolate* isolate); |
| |
| // Helper for SetProperty and SetSuperProperty. |
| // Return value is only meaningful if [found] is set to true on return. |
| MUST_USE_RESULT static Maybe<bool> SetPropertyInternal( |
| LookupIterator* it, Handle<Object> value, LanguageMode language_mode, |
| StoreFromKeyed store_mode, bool* found); |
| |
| MUST_USE_RESULT static MaybeHandle<Name> ConvertToName(Isolate* isolate, |
| Handle<Object> input); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Object); |
| }; |
| |
| |
| // In objects.h to be usable without objects-inl.h inclusion. |
| bool Object::IsSmi() const { return HAS_SMI_TAG(this); } |
| bool Object::IsHeapObject() const { return Internals::HasHeapObjectTag(this); } |
| |
| |
| struct Brief { |
| explicit Brief(const Object* const v) : value(v) {} |
| const Object* value; |
| }; |
| |
| |
| std::ostream& operator<<(std::ostream& os, const Brief& v); |
| |
| |
| // Smi represents integer Numbers that can be stored in 31 bits. |
| // Smis are immediate which means they are NOT allocated in the heap. |
| // The this pointer has the following format: [31 bit signed int] 0 |
| // For long smis it has the following format: |
| // [32 bit signed int] [31 bits zero padding] 0 |
| // Smi stands for small integer. |
| class Smi: public Object { |
| public: |
| // Returns the integer value. |
| inline int value() const { return Internals::SmiValue(this); } |
| |
| // Convert a value to a Smi object. |
| static inline Smi* FromInt(int value) { |
| DCHECK(Smi::IsValid(value)); |
| return reinterpret_cast<Smi*>(Internals::IntToSmi(value)); |
| } |
| |
| static inline Smi* FromIntptr(intptr_t value) { |
| DCHECK(Smi::IsValid(value)); |
| int smi_shift_bits = kSmiTagSize + kSmiShiftSize; |
| return reinterpret_cast<Smi*>((value << smi_shift_bits) | kSmiTag); |
| } |
| |
| // Returns whether value can be represented in a Smi. |
| static inline bool IsValid(intptr_t value) { |
| bool result = Internals::IsValidSmi(value); |
| DCHECK_EQ(result, value >= kMinValue && value <= kMaxValue); |
| return result; |
| } |
| |
| DECLARE_CAST(Smi) |
| |
| // Dispatched behavior. |
| void SmiPrint(std::ostream& os) const; // NOLINT |
| DECLARE_VERIFIER(Smi) |
| |
| static const int kMinValue = |
| (static_cast<unsigned int>(-1)) << (kSmiValueSize - 1); |
| static const int kMaxValue = -(kMinValue + 1); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Smi); |
| }; |
| |
| |
| // Heap objects typically have a map pointer in their first word. However, |
| // during GC other data (e.g. mark bits, forwarding addresses) is sometimes |
| // encoded in the first word. The class MapWord is an abstraction of the |
| // value in a heap object's first word. |
| class MapWord BASE_EMBEDDED { |
| public: |
| // Normal state: the map word contains a map pointer. |
| |
| // Create a map word from a map pointer. |
| static inline MapWord FromMap(const Map* map); |
| |
| // View this map word as a map pointer. |
| inline Map* ToMap(); |
| |
| |
| // Scavenge collection: the map word of live objects in the from space |
| // contains a forwarding address (a heap object pointer in the to space). |
| |
| // True if this map word is a forwarding address for a scavenge |
| // collection. Only valid during a scavenge collection (specifically, |
| // when all map words are heap object pointers, i.e. not during a full GC). |
| inline bool IsForwardingAddress() const; |
| |
| // Create a map word from a forwarding address. |
| static inline MapWord FromForwardingAddress(HeapObject* object); |
| |
| // View this map word as a forwarding address. |
| inline HeapObject* ToForwardingAddress(); |
| |
| static inline MapWord FromRawValue(uintptr_t value) { |
| return MapWord(value); |
| } |
| |
| inline uintptr_t ToRawValue() { |
| return value_; |
| } |
| |
| private: |
| // HeapObject calls the private constructor and directly reads the value. |
| friend class HeapObject; |
| |
| explicit MapWord(uintptr_t value) : value_(value) {} |
| |
| uintptr_t value_; |
| }; |
| |
| |
| // HeapObject is the superclass for all classes describing heap allocated |
| // objects. |
| class HeapObject: public Object { |
| public: |
| // [map]: Contains a map which contains the object's reflective |
| // information. |
| inline Map* map() const; |
| inline void set_map(Map* value); |
| // The no-write-barrier version. This is OK if the object is white and in |
| // new space, or if the value is an immortal immutable object, like the maps |
| // of primitive (non-JS) objects like strings, heap numbers etc. |
| inline void set_map_no_write_barrier(Map* value); |
| |
| // Get the map using acquire load. |
| inline Map* synchronized_map(); |
| inline MapWord synchronized_map_word() const; |
| |
| // Set the map using release store |
| inline void synchronized_set_map(Map* value); |
| inline void synchronized_set_map_no_write_barrier(Map* value); |
| inline void synchronized_set_map_word(MapWord map_word); |
| |
| // During garbage collection, the map word of a heap object does not |
| // necessarily contain a map pointer. |
| inline MapWord map_word() const; |
| inline void set_map_word(MapWord map_word); |
| |
| // The Heap the object was allocated in. Used also to access Isolate. |
| inline Heap* GetHeap() const; |
| |
| // Convenience method to get current isolate. |
| inline Isolate* GetIsolate() const; |
| |
| #define IS_TYPE_FUNCTION_DECL(Type) INLINE(bool Is##Type() const); |
| HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| #define IS_TYPE_FUNCTION_DECL(Type, Value) \ |
| INLINE(bool Is##Type(Isolate* isolate) const); |
| ODDBALL_LIST(IS_TYPE_FUNCTION_DECL) |
| #undef IS_TYPE_FUNCTION_DECL |
| |
| #define DECLARE_STRUCT_PREDICATE(NAME, Name, name) \ |
| INLINE(bool Is##Name() const); |
| STRUCT_LIST(DECLARE_STRUCT_PREDICATE) |
| #undef DECLARE_STRUCT_PREDICATE |
| |
| // Converts an address to a HeapObject pointer. |
| static inline HeapObject* FromAddress(Address address) { |
| DCHECK_TAG_ALIGNED(address); |
| return reinterpret_cast<HeapObject*>(address + kHeapObjectTag); |
| } |
| |
| // Returns the address of this HeapObject. |
| inline Address address() { |
| return reinterpret_cast<Address>(this) - kHeapObjectTag; |
| } |
| |
| // Iterates over pointers contained in the object (including the Map). |
| // If it's not performance critical iteration use the non-templatized |
| // version. |
| void Iterate(ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateFast(ObjectVisitor* v); |
| |
| // Iterates over all pointers contained in the object except the |
| // first map pointer. The object type is given in the first |
| // parameter. This function does not access the map pointer in the |
| // object, and so is safe to call while the map pointer is modified. |
| // If it's not performance critical iteration use the non-templatized |
| // version. |
| void IterateBody(ObjectVisitor* v); |
| void IterateBody(InstanceType type, int object_size, ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateBodyFast(ObjectVisitor* v); |
| |
| template <typename ObjectVisitor> |
| inline void IterateBodyFast(InstanceType type, int object_size, |
| ObjectVisitor* v); |
| |
| // Returns true if the object contains a tagged value at given offset. |
| // It is used for invalid slots filtering. If the offset points outside |
| // of the object or to the map word, the result is UNDEFINED (!!!). |
| bool IsValidSlot(int offset); |
| |
| // Returns the heap object's size in bytes |
| inline int Size(); |
| |
| // Given a heap object's map pointer, returns the heap size in bytes |
| // Useful when the map pointer field is used for other purposes. |
| // GC internal. |
| inline int SizeFromMap(Map* map); |
| |
| // Returns the field at offset in obj, as a read/write Object* reference. |
| // Does no checking, and is safe to use during GC, while maps are invalid. |
| // Does not invoke write barrier, so should only be assigned to |
| // during marking GC. |
| static inline Object** RawField(HeapObject* obj, int offset); |
| |
| // Adds the |code| object related to |name| to the code cache of this map. If |
| // this map is a dictionary map that is shared, the map copied and installed |
| // onto the object. |
| static void UpdateMapCodeCache(Handle<HeapObject> object, |
| Handle<Name> name, |
| Handle<Code> code); |
| |
| DECLARE_CAST(HeapObject) |
| |
| // Return the write barrier mode for this. Callers of this function |
| // must be able to present a reference to an DisallowHeapAllocation |
| // object as a sign that they are not going to use this function |
| // from code that allocates and thus invalidates the returned write |
| // barrier mode. |
| inline WriteBarrierMode GetWriteBarrierMode( |
| const DisallowHeapAllocation& promise); |
| |
| // Dispatched behavior. |
| void HeapObjectShortPrint(std::ostream& os); // NOLINT |
| #ifdef OBJECT_PRINT |
| void PrintHeader(std::ostream& os, const char* id); // NOLINT |
| #endif |
| DECLARE_PRINTER(HeapObject) |
| DECLARE_VERIFIER(HeapObject) |
| #ifdef VERIFY_HEAP |
| inline void VerifyObjectField(int offset); |
| inline void VerifySmiField(int offset); |
| |
| // Verify a pointer is a valid HeapObject pointer that points to object |
| // areas in the heap. |
| static void VerifyHeapPointer(Object* p); |
| #endif |
| |
| inline AllocationAlignment RequiredAlignment(); |
| |
| // Layout description. |
| // First field in a heap object is map. |
| static const int kMapOffset = Object::kHeaderSize; |
| static const int kHeaderSize = kMapOffset + kPointerSize; |
| |
| STATIC_ASSERT(kMapOffset == Internals::kHeapObjectMapOffset); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapObject); |
| }; |
| |
| |
| template <int start_offset, int end_offset, int size> |
| class FixedBodyDescriptor; |
| |
| |
| template <int start_offset> |
| class FlexibleBodyDescriptor; |
| |
| |
| // The HeapNumber class describes heap allocated numbers that cannot be |
| // represented in a Smi (small integer) |
| class HeapNumber: public HeapObject { |
| public: |
| // [value]: number value. |
| inline double value() const; |
| inline void set_value(double value); |
| |
| DECLARE_CAST(HeapNumber) |
| |
| // Dispatched behavior. |
| bool HeapNumberBooleanValue(); |
| |
| void HeapNumberPrint(std::ostream& os); // NOLINT |
| DECLARE_VERIFIER(HeapNumber) |
| |
| inline int get_exponent(); |
| inline int get_sign(); |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| // IEEE doubles are two 32 bit words. The first is just mantissa, the second |
| // is a mixture of sign, exponent and mantissa. The offsets of two 32 bit |
| // words within double numbers are endian dependent and they are set |
| // accordingly. |
| #if defined(V8_TARGET_LITTLE_ENDIAN) |
| static const int kMantissaOffset = kValueOffset; |
| static const int kExponentOffset = kValueOffset + 4; |
| #elif defined(V8_TARGET_BIG_ENDIAN) |
| static const int kMantissaOffset = kValueOffset + 4; |
| static const int kExponentOffset = kValueOffset; |
| #else |
| #error Unknown byte ordering |
| #endif |
| |
| static const int kSize = kValueOffset + kDoubleSize; |
| static const uint32_t kSignMask = 0x80000000u; |
| static const uint32_t kExponentMask = 0x7ff00000u; |
| static const uint32_t kMantissaMask = 0xfffffu; |
| static const int kMantissaBits = 52; |
| static const int kExponentBits = 11; |
| static const int kExponentBias = 1023; |
| static const int kExponentShift = 20; |
| static const int kInfinityOrNanExponent = |
| (kExponentMask >> kExponentShift) - kExponentBias; |
| static const int kMantissaBitsInTopWord = 20; |
| static const int kNonMantissaBitsInTopWord = 12; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(HeapNumber); |
| }; |
| |
| |
| // The Simd128Value class describes heap allocated 128 bit SIMD values. |
| class Simd128Value : public HeapObject { |
| public: |
| DECLARE_CAST(Simd128Value) |
| |
| DECLARE_PRINTER(Simd128Value) |
| DECLARE_VERIFIER(Simd128Value) |
| |
| static Handle<String> ToString(Handle<Simd128Value> input); |
| |
| // Equality operations. |
| inline bool Equals(Simd128Value* that); |
| static inline bool Equals(Handle<Simd128Value> one, Handle<Simd128Value> two); |
| |
| // Checks that another instance is bit-wise equal. |
| bool BitwiseEquals(const Simd128Value* other) const; |
| // Computes a hash from the 128 bit value, viewed as 4 32-bit integers. |
| uint32_t Hash() const; |
| // Copies the 16 bytes of SIMD data to the destination address. |
| void CopyBits(void* destination) const; |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kSimd128Size; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Simd128Value); |
| }; |
| |
| |
| // V has parameters (TYPE, Type, type, lane count, lane type) |
| #define SIMD128_TYPES(V) \ |
| V(FLOAT32X4, Float32x4, float32x4, 4, float) \ |
| V(INT32X4, Int32x4, int32x4, 4, int32_t) \ |
| V(UINT32X4, Uint32x4, uint32x4, 4, uint32_t) \ |
| V(BOOL32X4, Bool32x4, bool32x4, 4, bool) \ |
| V(INT16X8, Int16x8, int16x8, 8, int16_t) \ |
| V(UINT16X8, Uint16x8, uint16x8, 8, uint16_t) \ |
| V(BOOL16X8, Bool16x8, bool16x8, 8, bool) \ |
| V(INT8X16, Int8x16, int8x16, 16, int8_t) \ |
| V(UINT8X16, Uint8x16, uint8x16, 16, uint8_t) \ |
| V(BOOL8X16, Bool8x16, bool8x16, 16, bool) |
| |
| #define SIMD128_VALUE_CLASS(TYPE, Type, type, lane_count, lane_type) \ |
| class Type final : public Simd128Value { \ |
| public: \ |
| inline lane_type get_lane(int lane) const; \ |
| inline void set_lane(int lane, lane_type value); \ |
| \ |
| DECLARE_CAST(Type) \ |
| \ |
| DECLARE_PRINTER(Type) \ |
| \ |
| static Handle<String> ToString(Handle<Type> input); \ |
| \ |
| inline bool Equals(Type* that); \ |
| \ |
| private: \ |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Type); \ |
| }; |
| SIMD128_TYPES(SIMD128_VALUE_CLASS) |
| #undef SIMD128_VALUE_CLASS |
| |
| |
| enum EnsureElementsMode { |
| DONT_ALLOW_DOUBLE_ELEMENTS, |
| ALLOW_COPIED_DOUBLE_ELEMENTS, |
| ALLOW_CONVERTED_DOUBLE_ELEMENTS |
| }; |
| |
| |
| // Indicator for one component of an AccessorPair. |
| enum AccessorComponent { |
| ACCESSOR_GETTER, |
| ACCESSOR_SETTER |
| }; |
| |
| enum class GetKeysConversion { kKeepNumbers, kConvertToString }; |
| |
| enum class KeyCollectionMode { |
| kOwnOnly = static_cast<int>(v8::KeyCollectionMode::kOwnOnly), |
| kIncludePrototypes = |
| static_cast<int>(v8::KeyCollectionMode::kIncludePrototypes) |
| }; |
| |
| enum class AllocationSiteUpdateMode { kUpdate, kCheckOnly }; |
| |
| // JSReceiver includes types on which properties can be defined, i.e., |
| // JSObject and JSProxy. |
| class JSReceiver: public HeapObject { |
| public: |
| // [properties]: Backing storage for properties. |
| // properties is a FixedArray in the fast case and a Dictionary in the |
| // slow case. |
| DECL_ACCESSORS(properties, FixedArray) // Get and set fast properties. |
| inline void initialize_properties(); |
| inline bool HasFastProperties(); |
| // Gets slow properties for non-global objects. |
| inline NameDictionary* property_dictionary(); |
| |
| // Deletes an existing named property in a normalized object. |
| static void DeleteNormalizedProperty(Handle<JSReceiver> object, |
| Handle<Name> name, int entry); |
| |
| DECLARE_CAST(JSReceiver) |
| |
| // ES6 section 7.1.1 ToPrimitive |
| MUST_USE_RESULT static MaybeHandle<Object> ToPrimitive( |
| Handle<JSReceiver> receiver, |
| ToPrimitiveHint hint = ToPrimitiveHint::kDefault); |
| |
| // ES6 section 7.1.1.1 OrdinaryToPrimitive |
| MUST_USE_RESULT static MaybeHandle<Object> OrdinaryToPrimitive( |
| Handle<JSReceiver> receiver, OrdinaryToPrimitiveHint hint); |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSReceiver> receiver); |
| |
| // Get the first non-hidden prototype. |
| static inline MaybeHandle<Object> GetPrototype(Isolate* isolate, |
| Handle<JSReceiver> receiver); |
| |
| MUST_USE_RESULT static Maybe<bool> HasInPrototypeChain( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> proto); |
| |
| // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6. |
| MUST_USE_RESULT static Maybe<bool> HasProperty(LookupIterator* it); |
| MUST_USE_RESULT static inline Maybe<bool> HasProperty( |
| Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<bool> HasElement( |
| Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline Maybe<bool> HasOwnProperty( |
| Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<bool> HasOwnProperty( |
| Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSReceiver> receiver, const char* key); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty( |
| Handle<JSReceiver> receiver, Handle<Name> name); |
| MUST_USE_RESULT static inline MaybeHandle<Object> GetElement( |
| Isolate* isolate, Handle<JSReceiver> receiver, uint32_t index); |
| |
| // Implementation of ES6 [[Delete]] |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement( |
| Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = SLOPPY); |
| MUST_USE_RESULT static Maybe<bool> DeleteProperty( |
| Handle<JSReceiver> object, Handle<Name> name, |
| LanguageMode language_mode = SLOPPY); |
| MUST_USE_RESULT static Maybe<bool> DeleteProperty(LookupIterator* it, |
| LanguageMode language_mode); |
| MUST_USE_RESULT static Maybe<bool> DeleteElement( |
| Handle<JSReceiver> object, uint32_t index, |
| LanguageMode language_mode = SLOPPY); |
| |
| MUST_USE_RESULT static Object* DefineProperty(Isolate* isolate, |
| Handle<Object> object, |
| Handle<Object> name, |
| Handle<Object> attributes); |
| MUST_USE_RESULT static MaybeHandle<Object> DefineProperties( |
| Isolate* isolate, Handle<Object> object, Handle<Object> properties); |
| |
| // "virtual" dispatcher to the correct [[DefineOwnProperty]] implementation. |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| // ES6 7.3.4 (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> CreateDataProperty( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| // ES6 9.1.6.1 |
| MUST_USE_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| Isolate* isolate, Handle<JSObject> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| MUST_USE_RESULT static Maybe<bool> OrdinaryDefineOwnProperty( |
| LookupIterator* it, PropertyDescriptor* desc, ShouldThrow should_throw); |
| // ES6 9.1.6.2 |
| MUST_USE_RESULT static Maybe<bool> IsCompatiblePropertyDescriptor( |
| Isolate* isolate, bool extensible, PropertyDescriptor* desc, |
| PropertyDescriptor* current, Handle<Name> property_name, |
| ShouldThrow should_throw); |
| // ES6 9.1.6.3 |
| // |it| can be NULL in cases where the ES spec passes |undefined| as the |
| // receiver. Exactly one of |it| and |property_name| must be provided. |
| MUST_USE_RESULT static Maybe<bool> ValidateAndApplyPropertyDescriptor( |
| Isolate* isolate, LookupIterator* it, bool extensible, |
| PropertyDescriptor* desc, PropertyDescriptor* current, |
| ShouldThrow should_throw, Handle<Name> property_name = Handle<Name>()); |
| |
| MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| Isolate* isolate, Handle<JSReceiver> object, Handle<Object> key, |
| PropertyDescriptor* desc); |
| MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| LookupIterator* it, PropertyDescriptor* desc); |
| |
| typedef PropertyAttributes IntegrityLevel; |
| |
| // ES6 7.3.14 (when passed DONT_THROW) |
| // 'level' must be SEALED or FROZEN. |
| MUST_USE_RESULT static Maybe<bool> SetIntegrityLevel( |
| Handle<JSReceiver> object, IntegrityLevel lvl, ShouldThrow should_throw); |
| |
| // ES6 7.3.15 |
| // 'level' must be SEALED or FROZEN. |
| MUST_USE_RESULT static Maybe<bool> TestIntegrityLevel( |
| Handle<JSReceiver> object, IntegrityLevel lvl); |
| |
| // ES6 [[PreventExtensions]] (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSReceiver> object, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static Maybe<bool> IsExtensible(Handle<JSReceiver> object); |
| |
| // Returns the class name ([[Class]] property in the specification). |
| String* class_name(); |
| |
| // Returns the constructor name (the name (possibly, inferred name) of the |
| // function that was used to instantiate the object). |
| static Handle<String> GetConstructorName(Handle<JSReceiver> receiver); |
| |
| Context* GetCreationContext(); |
| |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> GetPropertyAttributes( |
| Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, Handle<Name> name); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnPropertyAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> GetElementAttributes( |
| Handle<JSReceiver> object, uint32_t index); |
| MUST_USE_RESULT static inline Maybe<PropertyAttributes> |
| GetOwnElementAttributes(Handle<JSReceiver> object, uint32_t index); |
| |
| MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes( |
| LookupIterator* it); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSReceiver> object, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| |
| inline static Handle<Object> GetDataProperty(Handle<JSReceiver> object, |
| Handle<Name> name); |
| static Handle<Object> GetDataProperty(LookupIterator* it); |
| |
| |
| // Retrieves a permanent object identity hash code. The undefined value might |
| // be returned in case no hash was created yet. |
| static inline Object* GetIdentityHash(Isolate* isolate, |
| Handle<JSReceiver> object); |
| |
| // Retrieves a permanent object identity hash code. May create and store a |
| // hash code if needed and none exists. |
| inline static Smi* GetOrCreateIdentityHash(Isolate* isolate, |
| Handle<JSReceiver> object); |
| |
| // ES6 [[OwnPropertyKeys]] (modulo return type) |
| MUST_USE_RESULT static inline MaybeHandle<FixedArray> OwnPropertyKeys( |
| Handle<JSReceiver> object); |
| |
| MUST_USE_RESULT static MaybeHandle<FixedArray> GetOwnValues( |
| Handle<JSReceiver> object, PropertyFilter filter); |
| |
| MUST_USE_RESULT static MaybeHandle<FixedArray> GetOwnEntries( |
| Handle<JSReceiver> object, PropertyFilter filter); |
| |
| // Layout description. |
| static const int kPropertiesOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = HeapObject::kHeaderSize + kPointerSize; |
| |
| bool HasProxyInPrototype(Isolate* isolate); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSReceiver); |
| }; |
| |
| |
| // The JSObject describes real heap allocated JavaScript objects with |
| // properties. |
| // Note that the map of JSObject changes during execution to enable inline |
| // caching. |
| class JSObject: public JSReceiver { |
| public: |
| static MUST_USE_RESULT MaybeHandle<JSObject> New( |
| Handle<JSFunction> constructor, Handle<JSReceiver> new_target, |
| Handle<AllocationSite> site = Handle<AllocationSite>::null()); |
| |
| // Gets global object properties. |
| inline GlobalDictionary* global_dictionary(); |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSObject> object); |
| |
| // [elements]: The elements (properties with names that are integers). |
| // |
| // Elements can be in two general modes: fast and slow. Each mode |
| // corrensponds to a set of object representations of elements that |
| // have something in common. |
| // |
| // In the fast mode elements is a FixedArray and so each element can |
| // be quickly accessed. This fact is used in the generated code. The |
| // elements array can have one of three maps in this mode: |
| // fixed_array_map, sloppy_arguments_elements_map or |
| // fixed_cow_array_map (for copy-on-write arrays). In the latter case |
| // the elements array may be shared by a few objects and so before |
| // writing to any element the array must be copied. Use |
| // EnsureWritableFastElements in this case. |
| // |
| // In the slow mode the elements is either a NumberDictionary, a |
| // FixedArray parameter map for a (sloppy) arguments object. |
| DECL_ACCESSORS(elements, FixedArrayBase) |
| inline void initialize_elements(); |
| static void ResetElements(Handle<JSObject> object); |
| static inline void SetMapAndElements(Handle<JSObject> object, |
| Handle<Map> map, |
| Handle<FixedArrayBase> elements); |
| inline ElementsKind GetElementsKind(); |
| ElementsAccessor* GetElementsAccessor(); |
| // Returns true if an object has elements of FAST_SMI_ELEMENTS ElementsKind. |
| inline bool HasFastSmiElements(); |
| // Returns true if an object has elements of FAST_ELEMENTS ElementsKind. |
| inline bool HasFastObjectElements(); |
| // Returns true if an object has elements of FAST_ELEMENTS or |
| // FAST_SMI_ONLY_ELEMENTS. |
| inline bool HasFastSmiOrObjectElements(); |
| // Returns true if an object has any of the fast elements kinds. |
| inline bool HasFastElements(); |
| // Returns true if an object has elements of FAST_DOUBLE_ELEMENTS |
| // ElementsKind. |
| inline bool HasFastDoubleElements(); |
| // Returns true if an object has elements of FAST_HOLEY_*_ELEMENTS |
| // ElementsKind. |
| inline bool HasFastHoleyElements(); |
| inline bool HasSloppyArgumentsElements(); |
| inline bool HasStringWrapperElements(); |
| inline bool HasDictionaryElements(); |
| |
| inline bool HasFixedTypedArrayElements(); |
| |
| inline bool HasFixedUint8ClampedElements(); |
| inline bool HasFixedArrayElements(); |
| inline bool HasFixedInt8Elements(); |
| inline bool HasFixedUint8Elements(); |
| inline bool HasFixedInt16Elements(); |
| inline bool HasFixedUint16Elements(); |
| inline bool HasFixedInt32Elements(); |
| inline bool HasFixedUint32Elements(); |
| inline bool HasFixedFloat32Elements(); |
| inline bool HasFixedFloat64Elements(); |
| |
| inline bool HasFastArgumentsElements(); |
| inline bool HasSlowArgumentsElements(); |
| inline bool HasFastStringWrapperElements(); |
| inline bool HasSlowStringWrapperElements(); |
| bool HasEnumerableElements(); |
| |
| inline SeededNumberDictionary* element_dictionary(); // Gets slow elements. |
| |
| // Requires: HasFastElements(). |
| static void EnsureWritableFastElements(Handle<JSObject> object); |
| |
| // Collects elements starting at index 0. |
| // Undefined values are placed after non-undefined values. |
| // Returns the number of non-undefined values. |
| static Handle<Object> PrepareElementsForSort(Handle<JSObject> object, |
| uint32_t limit); |
| // As PrepareElementsForSort, but only on objects where elements is |
| // a dictionary, and it will stay a dictionary. Collates undefined and |
| // unexisting elements below limit from position zero of the elements. |
| static Handle<Object> PrepareSlowElementsForSort(Handle<JSObject> object, |
| uint32_t limit); |
| |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithInterceptor( |
| LookupIterator* it, ShouldThrow should_throw, Handle<Object> value); |
| |
| // The API currently still wants DefineOwnPropertyIgnoreAttributes to convert |
| // AccessorInfo objects to data fields. We allow FORCE_FIELD as an exception |
| // to the default behavior that calls the setter. |
| enum AccessorInfoHandling { FORCE_FIELD, DONT_FORCE_FIELD }; |
| |
| MUST_USE_RESULT static MaybeHandle<Object> DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD); |
| |
| MUST_USE_RESULT static Maybe<bool> DefineOwnPropertyIgnoreAttributes( |
| LookupIterator* it, Handle<Object> value, PropertyAttributes attributes, |
| ShouldThrow should_throw, |
| AccessorInfoHandling handling = DONT_FORCE_FIELD); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> SetOwnPropertyIgnoreAttributes( |
| Handle<JSObject> object, Handle<Name> name, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> SetOwnElementIgnoreAttributes( |
| Handle<JSObject> object, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Equivalent to one of the above depending on whether |name| can be converted |
| // to an array index. |
| MUST_USE_RESULT static MaybeHandle<Object> |
| DefinePropertyOrElementIgnoreAttributes(Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes = NONE); |
| |
| // Adds or reconfigures a property to attributes NONE. It will fail when it |
| // cannot. |
| MUST_USE_RESULT static Maybe<bool> CreateDataProperty( |
| LookupIterator* it, Handle<Object> value, |
| ShouldThrow should_throw = DONT_THROW); |
| |
| static void AddProperty(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, PropertyAttributes attributes); |
| |
| MUST_USE_RESULT static Maybe<bool> AddDataElement( |
| Handle<JSObject> receiver, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes, ShouldThrow should_throw); |
| MUST_USE_RESULT static MaybeHandle<Object> AddDataElement( |
| Handle<JSObject> receiver, uint32_t index, Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| // Extend the receiver with a single fast property appeared first in the |
| // passed map. This also extends the property backing store if necessary. |
| static void AllocateStorageForMap(Handle<JSObject> object, Handle<Map> map); |
| |
| // Migrates the given object to a map whose field representations are the |
| // lowest upper bound of all known representations for that field. |
| static void MigrateInstance(Handle<JSObject> instance); |
| |
| // Migrates the given object only if the target map is already available, |
| // or returns false if such a map is not yet available. |
| static bool TryMigrateInstance(Handle<JSObject> instance); |
| |
| // Sets the property value in a normalized object given (key, value, details). |
| // Handles the special representation of JS global objects. |
| static void SetNormalizedProperty(Handle<JSObject> object, Handle<Name> name, |
| Handle<Object> value, |
| PropertyDetails details); |
| static void SetDictionaryElement(Handle<JSObject> object, uint32_t index, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| static void SetDictionaryArgumentsElement(Handle<JSObject> object, |
| uint32_t index, |
| Handle<Object> value, |
| PropertyAttributes attributes); |
| |
| static void OptimizeAsPrototype(Handle<JSObject> object, |
| PrototypeOptimizationMode mode); |
| static void ReoptimizeIfPrototype(Handle<JSObject> object); |
| static void MakePrototypesFast(Handle<Object> receiver, |
| WhereToStart where_to_start, Isolate* isolate); |
| static void LazyRegisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static void UpdatePrototypeUserRegistration(Handle<Map> old_map, |
| Handle<Map> new_map, |
| Isolate* isolate); |
| static bool UnregisterPrototypeUser(Handle<Map> user, Isolate* isolate); |
| static void InvalidatePrototypeChains(Map* map); |
| |
| // Utility used by many Array builtins and runtime functions |
| static inline bool PrototypeHasNoElements(Isolate* isolate, JSObject* object); |
| |
| // Alternative implementation of WeakFixedArray::NullCallback. |
| class PrototypeRegistryCompactionCallback { |
| public: |
| static void Callback(Object* value, int old_index, int new_index); |
| }; |
| |
| // Retrieve interceptors. |
| inline InterceptorInfo* GetNamedInterceptor(); |
| inline InterceptorInfo* GetIndexedInterceptor(); |
| |
| // Used from JSReceiver. |
| MUST_USE_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithInterceptor(LookupIterator* it); |
| MUST_USE_RESULT static Maybe<PropertyAttributes> |
| GetPropertyAttributesWithFailedAccessCheck(LookupIterator* it); |
| |
| // Defines an AccessorPair property on the given object. |
| // TODO(mstarzinger): Rename to SetAccessor(). |
| static MaybeHandle<Object> DefineAccessor(Handle<JSObject> object, |
| Handle<Name> name, |
| Handle<Object> getter, |
| Handle<Object> setter, |
| PropertyAttributes attributes); |
| static MaybeHandle<Object> DefineAccessor(LookupIterator* it, |
| Handle<Object> getter, |
| Handle<Object> setter, |
| PropertyAttributes attributes); |
| |
| // Defines an AccessorInfo property on the given object. |
| MUST_USE_RESULT static MaybeHandle<Object> SetAccessor( |
| Handle<JSObject> object, |
| Handle<AccessorInfo> info); |
| |
| // The result must be checked first for exceptions. If there's no exception, |
| // the output parameter |done| indicates whether the interceptor has a result |
| // or not. |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor( |
| LookupIterator* it, bool* done); |
| |
| static void ValidateElements(Handle<JSObject> object); |
| |
| // Makes sure that this object can contain HeapObject as elements. |
| static inline void EnsureCanContainHeapObjectElements(Handle<JSObject> obj); |
| |
| // Makes sure that this object can contain the specified elements. |
| static inline void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Object** elements, |
| uint32_t count, |
| EnsureElementsMode mode); |
| static inline void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Handle<FixedArrayBase> elements, |
| uint32_t length, |
| EnsureElementsMode mode); |
| static void EnsureCanContainElements( |
| Handle<JSObject> object, |
| Arguments* arguments, |
| uint32_t first_arg, |
| uint32_t arg_count, |
| EnsureElementsMode mode); |
| |
| // Would we convert a fast elements array to dictionary mode given |
| // an access at key? |
| bool WouldConvertToSlowElements(uint32_t index); |
| |
| // Computes the new capacity when expanding the elements of a JSObject. |
| static uint32_t NewElementsCapacity(uint32_t old_capacity) { |
| // (old_capacity + 50%) + 16 |
| return old_capacity + (old_capacity >> 1) + 16; |
| } |
| |
| // These methods do not perform access checks! |
| template <AllocationSiteUpdateMode update_or_check = |
| AllocationSiteUpdateMode::kUpdate> |
| static bool UpdateAllocationSite(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Lookup interceptors are used for handling properties controlled by host |
| // objects. |
| inline bool HasNamedInterceptor(); |
| inline bool HasIndexedInterceptor(); |
| |
| // Support functions for v8 api (needed for correct interceptor behavior). |
| MUST_USE_RESULT static Maybe<bool> HasRealNamedProperty( |
| Handle<JSObject> object, Handle<Name> name); |
| MUST_USE_RESULT static Maybe<bool> HasRealElementProperty( |
| Handle<JSObject> object, uint32_t index); |
| MUST_USE_RESULT static Maybe<bool> HasRealNamedCallbackProperty( |
| Handle<JSObject> object, Handle<Name> name); |
| |
| // Get the header size for a JSObject. Used to compute the index of |
| // internal fields as well as the number of internal fields. |
| static inline int GetHeaderSize(InstanceType instance_type); |
| inline int GetHeaderSize(); |
| |
| static inline int GetInternalFieldCount(Map* map); |
| inline int GetInternalFieldCount(); |
| inline int GetInternalFieldOffset(int index); |
| inline Object* GetInternalField(int index); |
| inline void SetInternalField(int index, Object* value); |
| inline void SetInternalField(int index, Smi* value); |
| bool WasConstructedFromApiFunction(); |
| |
| // Returns a new map with all transitions dropped from the object's current |
| // map and the ElementsKind set. |
| static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object, |
| ElementsKind to_kind); |
| static void TransitionElementsKind(Handle<JSObject> object, |
| ElementsKind to_kind); |
| |
| // Always use this to migrate an object to a new map. |
| // |expected_additional_properties| is only used for fast-to-slow transitions |
| // and ignored otherwise. |
| static void MigrateToMap(Handle<JSObject> object, Handle<Map> new_map, |
| int expected_additional_properties = 0); |
| |
| // Forces a prototype without any of the checks that the regular SetPrototype |
| // would do. |
| static void ForceSetPrototype(Handle<JSObject> object, Handle<Object> proto); |
| |
| // Convert the object to use the canonical dictionary |
| // representation. If the object is expected to have additional properties |
| // added this number can be indicated to have the backing store allocated to |
| // an initial capacity for holding these properties. |
| static void NormalizeProperties(Handle<JSObject> object, |
| PropertyNormalizationMode mode, |
| int expected_additional_properties, |
| const char* reason); |
| |
| // Convert and update the elements backing store to be a |
| // SeededNumberDictionary dictionary. Returns the backing after conversion. |
| static Handle<SeededNumberDictionary> NormalizeElements( |
| Handle<JSObject> object); |
| |
| void RequireSlowElements(SeededNumberDictionary* dictionary); |
| |
| // Transform slow named properties to fast variants. |
| static void MigrateSlowToFast(Handle<JSObject> object, |
| int unused_property_fields, const char* reason); |
| |
| inline bool IsUnboxedDoubleField(FieldIndex index); |
| |
| // Access fast-case object properties at index. |
| static Handle<Object> FastPropertyAt(Handle<JSObject> object, |
| Representation representation, |
| FieldIndex index); |
| inline Object* RawFastPropertyAt(FieldIndex index); |
| inline double RawFastDoublePropertyAt(FieldIndex index); |
| |
| inline void FastPropertyAtPut(FieldIndex index, Object* value); |
| inline void RawFastPropertyAtPut(FieldIndex index, Object* value); |
| inline void RawFastDoublePropertyAtPut(FieldIndex index, double value); |
| inline void WriteToField(int descriptor, PropertyDetails details, |
| Object* value); |
| inline void WriteToField(int descriptor, Object* value); |
| |
| // Access to in object properties. |
| inline int GetInObjectPropertyOffset(int index); |
| inline Object* InObjectPropertyAt(int index); |
| inline Object* InObjectPropertyAtPut(int index, |
| Object* value, |
| WriteBarrierMode mode |
| = UPDATE_WRITE_BARRIER); |
| |
| // Set the object's prototype (only JSReceiver and null are allowed values). |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSObject> object, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| |
| // Makes the object prototype immutable |
| // Never called from JavaScript |
| static void SetImmutableProto(Handle<JSObject> object); |
| |
| // Initializes the body starting at |start_offset|. It is responsibility of |
| // the caller to initialize object header. Fill the pre-allocated fields with |
| // pre_allocated_value and the rest with filler_value. |
| // Note: this call does not update write barrier, the caller is responsible |
| // to ensure that |filler_value| can be collected without WB here. |
| inline void InitializeBody(Map* map, int start_offset, |
| Object* pre_allocated_value, Object* filler_value); |
| |
| // Check whether this object references another object |
| bool ReferencesObject(Object* obj); |
| |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSObject> object, ShouldThrow should_throw); |
| |
| static bool IsExtensible(Handle<JSObject> object); |
| |
| // Copy object. |
| enum DeepCopyHints { kNoHints = 0, kObjectIsShallow = 1 }; |
| |
| MUST_USE_RESULT static MaybeHandle<JSObject> DeepCopy( |
| Handle<JSObject> object, |
| AllocationSiteUsageContext* site_context, |
| DeepCopyHints hints = kNoHints); |
| MUST_USE_RESULT static MaybeHandle<JSObject> DeepWalk( |
| Handle<JSObject> object, |
| AllocationSiteCreationContext* site_context); |
| |
| DECLARE_CAST(JSObject) |
| |
| // Dispatched behavior. |
| void JSObjectShortPrint(StringStream* accumulator); |
| DECLARE_PRINTER(JSObject) |
| DECLARE_VERIFIER(JSObject) |
| #ifdef OBJECT_PRINT |
| void PrintProperties(std::ostream& os); // NOLINT |
| void PrintElements(std::ostream& os); // NOLINT |
| #endif |
| #if defined(DEBUG) || defined(OBJECT_PRINT) |
| void PrintTransitions(std::ostream& os); // NOLINT |
| #endif |
| |
| static void PrintElementsTransition( |
| FILE* file, Handle<JSObject> object, |
| ElementsKind from_kind, Handle<FixedArrayBase> from_elements, |
| ElementsKind to_kind, Handle<FixedArrayBase> to_elements); |
| |
| void PrintInstanceMigration(FILE* file, Map* original_map, Map* new_map); |
| |
| #ifdef DEBUG |
| // Structure for collecting spill information about JSObjects. |
| class SpillInformation { |
| public: |
| void Clear(); |
| void Print(); |
| int number_of_objects_; |
| int number_of_objects_with_fast_properties_; |
| int number_of_objects_with_fast_elements_; |
| int number_of_fast_used_fields_; |
| int number_of_fast_unused_fields_; |
| int number_of_slow_used_properties_; |
| int number_of_slow_unused_properties_; |
| int number_of_fast_used_elements_; |
| int number_of_fast_unused_elements_; |
| int number_of_slow_used_elements_; |
| int number_of_slow_unused_elements_; |
| }; |
| |
| void IncrementSpillStatistics(SpillInformation* info); |
| #endif |
| |
| #ifdef VERIFY_HEAP |
| // If a GC was caused while constructing this object, the elements pointer |
| // may point to a one pointer filler map. The object won't be rooted, but |
| // our heap verification code could stumble across it. |
| bool ElementsAreSafeToExamine(); |
| #endif |
| |
| Object* SlowReverseLookup(Object* value); |
| |
| // Maximal number of elements (numbered 0 .. kMaxElementCount - 1). |
| // Also maximal value of JSArray's length property. |
| static const uint32_t kMaxElementCount = 0xffffffffu; |
| |
| // Constants for heuristics controlling conversion of fast elements |
| // to slow elements. |
| |
| // Maximal gap that can be introduced by adding an element beyond |
| // the current elements length. |
| static const uint32_t kMaxGap = 1024; |
| |
| // Maximal length of fast elements array that won't be checked for |
| // being dense enough on expansion. |
| static const int kMaxUncheckedFastElementsLength = 5000; |
| |
| // Same as above but for old arrays. This limit is more strict. We |
| // don't want to be wasteful with long lived objects. |
| static const int kMaxUncheckedOldFastElementsLength = 500; |
| |
| // This constant applies only to the initial map of "global.Object" and |
| // not to arbitrary other JSObject maps. |
| static const int kInitialGlobalObjectUnusedPropertiesCount = 4; |
| |
| static const int kMaxInstanceSize = 255 * kPointerSize; |
| // When extending the backing storage for property values, we increase |
| // its size by more than the 1 entry necessary, so sequentially adding fields |
| // to the same object requires fewer allocations and copies. |
| static const int kFieldsAdded = 3; |
| |
| // Layout description. |
| static const int kElementsOffset = JSReceiver::kHeaderSize; |
| static const int kHeaderSize = kElementsOffset + kPointerSize; |
| |
| STATIC_ASSERT(kHeaderSize == Internals::kJSObjectHeaderSize); |
| |
| typedef FlexibleBodyDescriptor<JSReceiver::kPropertiesOffset> BodyDescriptor; |
| |
| // Gets the number of currently used elements. |
| int GetFastElementsUsage(); |
| |
| static bool AllCanRead(LookupIterator* it); |
| static bool AllCanWrite(LookupIterator* it); |
| |
| private: |
| friend class JSReceiver; |
| friend class Object; |
| |
| // Used from Object::GetProperty(). |
| MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithFailedAccessCheck( |
| LookupIterator* it); |
| |
| MUST_USE_RESULT static Maybe<bool> SetPropertyWithFailedAccessCheck( |
| LookupIterator* it, Handle<Object> value, ShouldThrow should_throw); |
| |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyWithInterceptor( |
| LookupIterator* it, ShouldThrow should_throw); |
| |
| bool ReferencesObjectFromElements(FixedArray* elements, |
| ElementsKind kind, |
| Object* object); |
| |
| static Object* GetIdentityHash(Isolate* isolate, Handle<JSObject> object); |
| |
| static Smi* GetOrCreateIdentityHash(Isolate* isolate, |
| Handle<JSObject> object); |
| |
| // Helper for fast versions of preventExtensions, seal, and freeze. |
| // attrs is one of NONE, SEALED, or FROZEN (depending on the operation). |
| template <PropertyAttributes attrs> |
| MUST_USE_RESULT static Maybe<bool> PreventExtensionsWithTransition( |
| Handle<JSObject> object, ShouldThrow should_throw); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject); |
| }; |
| |
| |
| // JSAccessorPropertyDescriptor is just a JSObject with a specific initial |
| // map. This initial map adds in-object properties for "get", "set", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular accessor properties. |
| class JSAccessorPropertyDescriptor: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kGetOffset = JSObject::kHeaderSize; |
| static const int kSetOffset = kGetOffset + kPointerSize; |
| static const int kEnumerableOffset = kSetOffset + kPointerSize; |
| static const int kConfigurableOffset = kEnumerableOffset + kPointerSize; |
| static const int kSize = kConfigurableOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kGetIndex = 0; |
| static const int kSetIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSAccessorPropertyDescriptor); |
| }; |
| |
| |
| // JSDataPropertyDescriptor is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "value", "writable", |
| // "enumerable" and "configurable" properties, as assigned by the |
| // FromPropertyDescriptor function for regular data properties. |
| class JSDataPropertyDescriptor: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kWritableOffset = kValueOffset + kPointerSize; |
| static const int kEnumerableOffset = kWritableOffset + kPointerSize; |
| static const int kConfigurableOffset = kEnumerableOffset + kPointerSize; |
| static const int kSize = kConfigurableOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kWritableIndex = 1; |
| static const int kEnumerableIndex = 2; |
| static const int kConfigurableIndex = 3; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataPropertyDescriptor); |
| }; |
| |
| |
| // JSIteratorResult is just a JSObject with a specific initial map. |
| // This initial map adds in-object properties for "done" and "value", |
| // as specified by ES6 section 25.1.1.3 The IteratorResult Interface |
| class JSIteratorResult: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kDoneOffset = kValueOffset + kPointerSize; |
| static const int kSize = kDoneOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kValueIndex = 0; |
| static const int kDoneIndex = 1; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSIteratorResult); |
| }; |
| |
| |
| // Common superclass for JSSloppyArgumentsObject and JSStrictArgumentsObject. |
| class JSArgumentsObject: public JSObject { |
| public: |
| // Offsets of object fields. |
| static const int kLengthOffset = JSObject::kHeaderSize; |
| static const int kHeaderSize = kLengthOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kLengthIndex = 0; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArgumentsObject); |
| }; |
| |
| |
| // JSSloppyArgumentsObject is just a JSObject with specific initial map. |
| // This initial map adds in-object properties for "length" and "callee". |
| class JSSloppyArgumentsObject: public JSArgumentsObject { |
| public: |
| // Offsets of object fields. |
| static const int kCalleeOffset = JSArgumentsObject::kHeaderSize; |
| static const int kSize = kCalleeOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kCalleeIndex = 1; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSSloppyArgumentsObject); |
| }; |
| |
| |
| // JSStrictArgumentsObject is just a JSObject with specific initial map. |
| // This initial map adds an in-object property for "length". |
| class JSStrictArgumentsObject: public JSArgumentsObject { |
| public: |
| // Offsets of object fields. |
| static const int kSize = JSArgumentsObject::kHeaderSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSStrictArgumentsObject); |
| }; |
| |
| |
| // Common superclass for FixedArrays that allow implementations to share |
| // common accessors and some code paths. |
| class FixedArrayBase: public HeapObject { |
| public: |
| // [length]: length of the array. |
| inline int length() const; |
| inline void set_length(int value); |
| |
| // Get and set the length using acquire loads and release stores. |
| inline int synchronized_length() const; |
| inline void synchronized_set_length(int value); |
| |
| DECLARE_CAST(FixedArrayBase) |
| |
| static int GetMaxLengthForNewSpaceAllocation(ElementsKind kind); |
| |
| // Layout description. |
| // Length is smi tagged when it is stored. |
| static const int kLengthOffset = HeapObject::kHeaderSize; |
| static const int kHeaderSize = kLengthOffset + kPointerSize; |
| }; |
| |
| |
| class FixedDoubleArray; |
| class IncrementalMarking; |
| |
| |
| // FixedArray describes fixed-sized arrays with element type Object*. |
| class FixedArray: public FixedArrayBase { |
| public: |
| // Setter and getter for elements. |
| inline Object* get(int index) const; |
| static inline Handle<Object> get(FixedArray* array, int index, |
| Isolate* isolate); |
| template <class T> |
| MaybeHandle<T> GetValue(Isolate* isolate, int index) const; |
| |
| template <class T> |
| Handle<T> GetValueChecked(Isolate* isolate, int index) const; |
| |
| // Return a grown copy if the index is bigger than the array's length. |
| static Handle<FixedArray> SetAndGrow(Handle<FixedArray> array, int index, |
| Handle<Object> value); |
| |
| // Setter that uses write barrier. |
| inline void set(int index, Object* value); |
| inline bool is_the_hole(int index); |
| |
| // Setter that doesn't need write barrier. |
| inline void set(int index, Smi* value); |
| // Setter with explicit barrier mode. |
| inline void set(int index, Object* value, WriteBarrierMode mode); |
| |
| // Setters for frequently used oddballs located in old space. |
| inline void set_undefined(int index); |
| inline void set_null(int index); |
| inline void set_the_hole(int index); |
| |
| inline Object** GetFirstElementAddress(); |
| inline bool ContainsOnlySmisOrHoles(); |
| |
| // Gives access to raw memory which stores the array's data. |
| inline Object** data_start(); |
| |
| inline void FillWithHoles(int from, int to); |
| |
| // Shrink length and insert filler objects. |
| void Shrink(int length); |
| |
| // Copy a sub array from the receiver to dest. |
| void CopyTo(int pos, FixedArray* dest, int dest_pos, int len); |
| |
| // Garbage collection support. |
| static int SizeFor(int length) { return kHeaderSize + length * kPointerSize; } |
| |
| // Code Generation support. |
| static int OffsetOfElementAt(int index) { return SizeFor(index); } |
| |
| // Garbage collection support. |
| inline Object** RawFieldOfElementAt(int index); |
| |
| DECLARE_CAST(FixedArray) |
| |
| // Maximal allowed size, in bytes, of a single FixedArray. |
| // Prevents overflowing size computations, as well as extreme memory |
| // consumption. |
| static const int kMaxSize = 128 * MB * kPointerSize; |
| // Maximally allowed length of a FixedArray. |
| static const int kMaxLength = (kMaxSize - kHeaderSize) / kPointerSize; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(FixedArray) |
| DECLARE_VERIFIER(FixedArray) |
| #ifdef DEBUG |
| // Checks if two FixedArrays have identical contents. |
| bool IsEqualTo(FixedArray* other); |
| #endif |
| |
| // Swap two elements in a pair of arrays. If this array and the |
| // numbers array are the same object, the elements are only swapped |
| // once. |
| void SwapPairs(FixedArray* numbers, int i, int j); |
| |
| // Sort prefix of this array and the numbers array as pairs wrt. the |
| // numbers. If the numbers array and the this array are the same |
| // object, the prefix of this array is sorted. |
| void SortPairs(FixedArray* numbers, uint32_t len); |
| |
| typedef FlexibleBodyDescriptor<kHeaderSize> BodyDescriptor; |
| |
| protected: |
| // Set operation on FixedArray without using write barriers. Can |
| // only be used for storing old space objects or smis. |
| static inline void NoWriteBarrierSet(FixedArray* array, |
| int index, |
| Object* value); |
| |
| private: |
| STATIC_ASSERT(kHeaderSize == Internals::kFixedArrayHeaderSize); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedArray); |
| }; |
| |
| |
| // FixedDoubleArray describes fixed-sized arrays with element type double. |
| class FixedDoubleArray: public FixedArrayBase { |
| public: |
| // Setter and getter for elements. |
| inline double get_scalar(int index); |
| inline uint64_t get_representation(int index); |
| static inline Handle<Object> get(FixedDoubleArray* array, int index, |
| Isolate* isolate); |
| inline void set(int index, double value); |
| inline void set_the_hole(int index); |
| |
| // Checking for the hole. |
| inline bool is_the_hole(int index); |
| |
| // Garbage collection support. |
| inline static int SizeFor(int length) { |
| return kHeaderSize + length * kDoubleSize; |
| } |
| |
| // Gives access to raw memory which stores the array's data. |
| inline double* data_start(); |
| |
| inline void FillWithHoles(int from, int to); |
| |
| // Code Generation support. |
| static int OffsetOfElementAt(int index) { return SizeFor(index); } |
| |
| DECLARE_CAST(FixedDoubleArray) |
| |
| // Maximal allowed size, in bytes, of a single FixedDoubleArray. |
| // Prevents overflowing size computations, as well as extreme memory |
| // consumption. |
| static const int kMaxSize = 512 * MB; |
| // Maximally allowed length of a FixedArray. |
| static const int kMaxLength = (kMaxSize - kHeaderSize) / kDoubleSize; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(FixedDoubleArray) |
| DECLARE_VERIFIER(FixedDoubleArray) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedDoubleArray); |
| }; |
| |
| |
| class WeakFixedArray : public FixedArray { |
| public: |
| // If |maybe_array| is not a WeakFixedArray, a fresh one will be allocated. |
| // This function does not check if the value exists already, callers must |
| // ensure this themselves if necessary. |
| static Handle<WeakFixedArray> Add(Handle<Object> maybe_array, |
| Handle<HeapObject> value, |
| int* assigned_index = NULL); |
| |
| // Returns true if an entry was found and removed. |
| bool Remove(Handle<HeapObject> value); |
| |
| class NullCallback { |
| public: |
| static void Callback(Object* value, int old_index, int new_index) {} |
| }; |
| |
| template <class CompactionCallback> |
| void Compact(); |
| |
| inline Object* Get(int index) const; |
| inline void Clear(int index); |
| inline int Length() const; |
| |
| inline bool IsEmptySlot(int index) const; |
| static Object* Empty() { return Smi::FromInt(0); } |
| |
| class Iterator { |
| public: |
| explicit Iterator(Object* maybe_array) : list_(NULL) { Reset(maybe_array); } |
| void Reset(Object* maybe_array); |
| |
| template <class T> |
| inline T* Next(); |
| |
| private: |
| int index_; |
| WeakFixedArray* list_; |
| #ifdef DEBUG |
| int last_used_index_; |
| DisallowHeapAllocation no_gc_; |
| #endif // DEBUG |
| DISALLOW_COPY_AND_ASSIGN(Iterator); |
| }; |
| |
| DECLARE_CAST(WeakFixedArray) |
| |
| private: |
| static const int kLastUsedIndexIndex = 0; |
| static const int kFirstIndex = 1; |
| |
| static Handle<WeakFixedArray> Allocate( |
| Isolate* isolate, int size, Handle<WeakFixedArray> initialize_from); |
| |
| static void Set(Handle<WeakFixedArray> array, int index, |
| Handle<HeapObject> value); |
| inline void clear(int index); |
| |
| inline int last_used_index() const; |
| inline void set_last_used_index(int index); |
| |
| // Disallow inherited setters. |
| void set(int index, Smi* value); |
| void set(int index, Object* value); |
| void set(int index, Object* value, WriteBarrierMode mode); |
| DISALLOW_IMPLICIT_CONSTRUCTORS(WeakFixedArray); |
| }; |
| |
| // Generic array grows dynamically with O(1) amortized insertion. |
| class ArrayList : public FixedArray { |
| public: |
| enum AddMode { |
| kNone, |
| // Use this if GC can delete elements from the array. |
| kReloadLengthAfterAllocation, |
| }; |
| static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj, |
| AddMode mode = kNone); |
| static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj1, |
| Handle<Object> obj2, AddMode = kNone); |
| inline int Length(); |
| inline void SetLength(int length); |
| inline Object* Get(int index); |
| inline Object** Slot(int index); |
| inline void Set(int index, Object* obj, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| inline void Clear(int index, Object* undefined); |
| bool IsFull(); |
| DECLARE_CAST(ArrayList) |
| |
| private: |
| static Handle<ArrayList> EnsureSpace(Handle<ArrayList> array, int length); |
| static const int kLengthIndex = 0; |
| static const int kFirstIndex = 1; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ArrayList); |
| }; |
| |
| #define FRAME_ARRAY_FIELD_LIST(V) \ |
| V(WasmObject, Object) \ |
| V(WasmFunctionIndex, Smi) \ |
| V(Receiver, Object) \ |
| V(Function, JSFunction) \ |
| V(Code, AbstractCode) \ |
| V(Offset, Smi) \ |
| V(Flags, Smi) |
| |
| // Container object for data collected during simple stack trace captures. |
| class FrameArray : public FixedArray { |
| public: |
| #define DECLARE_FRAME_ARRAY_ACCESSORS(name, type) \ |
| inline type* name(int frame_ix) const; \ |
| inline void Set##name(int frame_ix, type* value); |
| FRAME_ARRAY_FIELD_LIST(DECLARE_FRAME_ARRAY_ACCESSORS) |
| #undef DECLARE_FRAME_ARRAY_ACCESSORS |
| |
| inline bool IsWasmFrame(int frame_ix) const; |
| inline int FrameCount() const; |
| |
| void ShrinkToFit(); |
| |
| // Flags. |
| static const int kIsWasmFrame = 1 << 0; |
| static const int kIsStrict = 1 << 1; |
| static const int kForceConstructor = 1 << 2; |
| |
| static Handle<FrameArray> AppendJSFrame(Handle<FrameArray> in, |
| Handle<Object> receiver, |
| Handle<JSFunction> function, |
| Handle<AbstractCode> code, int offset, |
| int flags); |
| static Handle<FrameArray> AppendWasmFrame(Handle<FrameArray> in, |
| Handle<Object> wasm_object, |
| int wasm_function_index, |
| Handle<AbstractCode> code, |
| int offset, int flags); |
| |
| DECLARE_CAST(FrameArray) |
| |
| private: |
| // The underlying fixed array embodies a captured stack trace. Frame i |
| // occupies indices |
| // |
| // kFirstIndex + 1 + [i * kElementsPerFrame, (i + 1) * kElementsPerFrame[, |
| // |
| // with internal offsets as below: |
| |
| static const int kWasmObjectOffset = 0; |
| static const int kWasmFunctionIndexOffset = 1; |
| |
| static const int kReceiverOffset = 0; |
| static const int kFunctionOffset = 1; |
| |
| static const int kCodeOffset = 2; |
| static const int kOffsetOffset = 3; |
| |
| static const int kFlagsOffset = 4; |
| |
| static const int kElementsPerFrame = 5; |
| |
| // Array layout indices. |
| |
| static const int kFrameCountIndex = 0; |
| static const int kFirstIndex = 1; |
| |
| static int LengthFor(int frame_count) { |
| return kFirstIndex + frame_count * kElementsPerFrame; |
| } |
| |
| static Handle<FrameArray> EnsureSpace(Handle<FrameArray> array, int length); |
| |
| friend class Factory; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FrameArray); |
| }; |
| |
| // DescriptorArrays are fixed arrays used to hold instance descriptors. |
| // The format of the these objects is: |
| // [0]: Number of descriptors |
| // [1]: Either Smi(0) if uninitialized, or a pointer to small fixed array: |
| // [0]: pointer to fixed array with enum cache |
| // [1]: either Smi(0) or pointer to fixed array with indices |
| // [2]: first key |
| // [2 + number of descriptors * kDescriptorSize]: start of slack |
| class DescriptorArray: public FixedArray { |
| public: |
| // Returns true for both shared empty_descriptor_array and for smis, which the |
| // map uses to encode additional bit fields when the descriptor array is not |
| // yet used. |
| inline bool IsEmpty(); |
| |
| // Returns the number of descriptors in the array. |
| inline int number_of_descriptors(); |
| |
| inline int number_of_descriptors_storage(); |
| |
| inline int NumberOfSlackDescriptors(); |
| |
| inline void SetNumberOfDescriptors(int number_of_descriptors); |
| inline int number_of_entries(); |
| |
| inline bool HasEnumCache(); |
| |
| inline void CopyEnumCacheFrom(DescriptorArray* array); |
| |
| inline FixedArray* GetEnumCache(); |
| |
| inline bool HasEnumIndicesCache(); |
| |
| inline FixedArray* GetEnumIndicesCache(); |
| |
| inline Object** GetEnumCacheSlot(); |
| |
| void ClearEnumCache(); |
| |
| // Initialize or change the enum cache, |
| // using the supplied storage for the small "bridge". |
| static void SetEnumCache(Handle<DescriptorArray> descriptors, |
| Isolate* isolate, Handle<FixedArray> new_cache, |
| Handle<FixedArray> new_index_cache); |
| |
| // Accessors for fetching instance descriptor at descriptor number. |
| inline Name* GetKey(int descriptor_number); |
| inline Object** GetKeySlot(int descriptor_number); |
| inline Object* GetValue(int descriptor_number); |
| inline void SetValue(int descriptor_number, Object* value); |
| inline Object** GetValueSlot(int descriptor_number); |
| static inline int GetValueOffset(int descriptor_number); |
| inline Object** GetDescriptorStartSlot(int descriptor_number); |
| inline Object** GetDescriptorEndSlot(int descriptor_number); |
| inline PropertyDetails GetDetails(int descriptor_number); |
| inline PropertyType GetType(int descriptor_number); |
| inline int GetFieldIndex(int descriptor_number); |
| FieldType* GetFieldType(int descriptor_number); |
| inline Object* GetConstant(int descriptor_number); |
| inline Object* GetCallbacksObject(int descriptor_number); |
| inline AccessorDescriptor* GetCallbacks(int descriptor_number); |
| |
| inline Name* GetSortedKey(int descriptor_number); |
| inline int GetSortedKeyIndex(int descriptor_number); |
| inline void SetSortedKey(int pointer, int descriptor_number); |
| inline void SetRepresentation(int descriptor_number, |
| Representation representation); |
| |
| // Accessor for complete descriptor. |
| inline void Get(int descriptor_number, Descriptor* desc); |
| inline void Set(int descriptor_number, Descriptor* desc); |
| void Replace(int descriptor_number, Descriptor* descriptor); |
| |
| // Append automatically sets the enumeration index. This should only be used |
| // to add descriptors in bulk at the end, followed by sorting the descriptor |
| // array. |
| inline void Append(Descriptor* desc); |
| |
| static Handle<DescriptorArray> CopyUpTo(Handle<DescriptorArray> desc, |
| int enumeration_index, |
| int slack = 0); |
| |
| static Handle<DescriptorArray> CopyUpToAddAttributes( |
| Handle<DescriptorArray> desc, |
| int enumeration_index, |
| PropertyAttributes attributes, |
| int slack = 0); |
| |
| // Sort the instance descriptors by the hash codes of their keys. |
| void Sort(); |
| |
| // Search the instance descriptors for given name. |
| INLINE(int Search(Name* name, int number_of_own_descriptors)); |
| |
| // As the above, but uses DescriptorLookupCache and updates it when |
| // necessary. |
| INLINE(int SearchWithCache(Isolate* isolate, Name* name, Map* map)); |
| |
| bool IsEqualUpTo(DescriptorArray* desc, int nof_descriptors); |
| |
| // Allocates a DescriptorArray, but returns the singleton |
| // empty descriptor array object if number_of_descriptors is 0. |
| static Handle<DescriptorArray> Allocate( |
| Isolate* isolate, int number_of_descriptors, int slack, |
| PretenureFlag pretenure = NOT_TENURED); |
| |
| DECLARE_CAST(DescriptorArray) |
| |
| // Constant for denoting key was not found. |
| static const int kNotFound = -1; |
| |
| static const int kDescriptorLengthIndex = 0; |
| static const int kEnumCacheIndex = 1; |
| static const int kFirstIndex = 2; |
| |
| // The length of the "bridge" to the enum cache. |
| static const int kEnumCacheBridgeLength = 2; |
| static const int kEnumCacheBridgeCacheIndex = 0; |
| static const int kEnumCacheBridgeIndicesCacheIndex = 1; |
| |
| // Layout description. |
| static const int kDescriptorLengthOffset = FixedArray::kHeaderSize; |
| static const int kEnumCacheOffset = kDescriptorLengthOffset + kPointerSize; |
| static const int kFirstOffset = kEnumCacheOffset + kPointerSize; |
| |
| // Layout description for the bridge array. |
| static const int kEnumCacheBridgeCacheOffset = FixedArray::kHeaderSize; |
| |
| // Layout of descriptor. |
| static const int kDescriptorKey = 0; |
| static const int kDescriptorDetails = 1; |
| static const int kDescriptorValue = 2; |
| static const int kDescriptorSize = 3; |
| |
| #if defined(DEBUG) || defined(OBJECT_PRINT) |
| // For our gdb macros, we should perhaps change these in the future. |
| void Print(); |
| |
| // Print all the descriptors. |
| void PrintDescriptors(std::ostream& os); // NOLINT |
| #endif |
| |
| #ifdef DEBUG |
| // Is the descriptor array sorted and without duplicates? |
| bool IsSortedNoDuplicates(int valid_descriptors = -1); |
| |
| // Is the descriptor array consistent with the back pointers in targets? |
| bool IsConsistentWithBackPointers(Map* current_map); |
| |
| // Are two DescriptorArrays equal? |
| bool IsEqualTo(DescriptorArray* other); |
| #endif |
| |
| // Returns the fixed array length required to hold number_of_descriptors |
| // descriptors. |
| static int LengthFor(int number_of_descriptors) { |
| return ToKeyIndex(number_of_descriptors); |
| } |
| |
| static int ToDetailsIndex(int descriptor_number) { |
| return kFirstIndex + (descriptor_number * kDescriptorSize) + |
| kDescriptorDetails; |
| } |
| |
| // Conversion from descriptor number to array indices. |
| static int ToKeyIndex(int descriptor_number) { |
| return kFirstIndex + (descriptor_number * kDescriptorSize) + kDescriptorKey; |
| } |
| |
| static int ToValueIndex(int descriptor_number) { |
| return kFirstIndex + (descriptor_number * kDescriptorSize) + |
| kDescriptorValue; |
| } |
| |
| private: |
| // An entry in a DescriptorArray, represented as an (array, index) pair. |
| class Entry { |
| public: |
| inline explicit Entry(DescriptorArray* descs, int index) : |
| descs_(descs), index_(index) { } |
| |
| inline PropertyType type(); |
| inline Object* GetCallbackObject(); |
| |
| private: |
| DescriptorArray* descs_; |
| int index_; |
| }; |
| |
| // Transfer a complete descriptor from the src descriptor array to this |
| // descriptor array. |
| void CopyFrom(int index, DescriptorArray* src); |
| |
| inline void SetDescriptor(int descriptor_number, Descriptor* desc); |
| |
| // Swap first and second descriptor. |
| inline void SwapSortedKeys(int first, int second); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(DescriptorArray); |
| }; |
| |
| |
| enum SearchMode { ALL_ENTRIES, VALID_ENTRIES }; |
| |
| template <SearchMode search_mode, typename T> |
| inline int Search(T* array, Name* name, int valid_entries = 0, |
| int* out_insertion_index = NULL); |
| |
| |
| // HashTable is a subclass of FixedArray that implements a hash table |
| // that uses open addressing and quadratic probing. |
| // |
| // In order for the quadratic probing to work, elements that have not |
| // yet been used and elements that have been deleted are |
| // distinguished. Probing continues when deleted elements are |
| // encountered and stops when unused elements are encountered. |
| // |
| // - Elements with key == undefined have not been used yet. |
| // - Elements with key == the_hole have been deleted. |
| // |
| // The hash table class is parameterized with a Shape and a Key. |
| // Shape must be a class with the following interface: |
| // class ExampleShape { |
| // public: |
| // // Tells whether key matches other. |
| // static bool IsMatch(Key key, Object* other); |
| // // Returns the hash value for key. |
| // static uint32_t Hash(Key key); |
| // // Returns the hash value for object. |
| // static uint32_t HashForObject(Key key, Object* object); |
| // // Convert key to an object. |
| // static inline Handle<Object> AsHandle(Isolate* isolate, Key key); |
| // // The prefix size indicates number of elements in the beginning |
| // // of the backing storage. |
| // static const int kPrefixSize = ..; |
| // // The Element size indicates number of elements per entry. |
| // static const int kEntrySize = ..; |
| // }; |
| // The prefix size indicates an amount of memory in the |
| // beginning of the backing storage that can be used for non-element |
| // information by subclasses. |
| |
| template<typename Key> |
| class BaseShape { |
| public: |
| static const bool UsesSeed = false; |
| static uint32_t Hash(Key key) { return 0; } |
| static uint32_t SeededHash(Key key, uint32_t seed) { |
| DCHECK(UsesSeed); |
| return Hash(key); |
| } |
| static uint32_t HashForObject(Key key, Object* object) { return 0; } |
| static uint32_t SeededHashForObject(Key key, uint32_t seed, Object* object) { |
| DCHECK(UsesSeed); |
| return HashForObject(key, object); |
| } |
| static inline Map* GetMap(Isolate* isolate); |
| }; |
| |
| |
| class HashTableBase : public FixedArray { |
| public: |
| // Returns the number of elements in the hash table. |
| inline int NumberOfElements(); |
| |
| // Returns the number of deleted elements in the hash table. |
| inline int NumberOfDeletedElements(); |
| |
| // Returns the capacity of the hash table. |
| inline int Capacity(); |
| |
| // ElementAdded should be called whenever an element is added to a |
| // hash table. |
| inline void ElementAdded(); |
| |
| // ElementRemoved should be called whenever an element is removed from |
| // a hash table. |
| inline void ElementRemoved(); |
| inline void ElementsRemoved(int n); |
| |
| // Computes the required capacity for a table holding the given |
| // number of elements. May be more than HashTable::kMaxCapacity. |
| static inline int ComputeCapacity(int at_least_space_for); |
| |
| // Tells whether k is a real key. The hole and undefined are not allowed |
| // as keys and can be used to indicate missing or deleted elements. |
| inline bool IsKey(Object* k); |
| inline bool IsKey(Isolate* isolate, Object* k); |
| |
| // Compute the probe offset (quadratic probing). |
| INLINE(static uint32_t GetProbeOffset(uint32_t n)) { |
| return (n + n * n) >> 1; |
| } |
| |
| static const int kNumberOfElementsIndex = 0; |
| static const int kNumberOfDeletedElementsIndex = 1; |
| static const int kCapacityIndex = 2; |
| static const int kPrefixStartIndex = 3; |
| |
| // Constant used for denoting a absent entry. |
| static const int kNotFound = -1; |
| |
| protected: |
| // Update the number of elements in the hash table. |
| inline void SetNumberOfElements(int nof); |
| |
| // Update the number of deleted elements in the hash table. |
| inline void SetNumberOfDeletedElements(int nod); |
| |
| // Returns probe entry. |
| static uint32_t GetProbe(uint32_t hash, uint32_t number, uint32_t size) { |
| DCHECK(base::bits::IsPowerOfTwo32(size)); |
| return (hash + GetProbeOffset(number)) & (size - 1); |
| } |
| |
| inline static uint32_t FirstProbe(uint32_t hash, uint32_t size) { |
| return hash & (size - 1); |
| } |
| |
| inline static uint32_t NextProbe( |
| uint32_t last, uint32_t number, uint32_t size) { |
| return (last + number) & (size - 1); |
| } |
| }; |
| |
| |
| template <typename Derived, typename Shape, typename Key> |
| class HashTable : public HashTableBase { |
| public: |
| typedef Shape ShapeT; |
| |
| // Wrapper methods |
| inline uint32_t Hash(Key key) { |
| if (Shape::UsesSeed) { |
| return Shape::SeededHash(key, GetHeap()->HashSeed()); |
| } else { |
| return Shape::Hash(key); |
| } |
| } |
| |
| inline uint32_t HashForObject(Key key, Object* object) { |
| if (Shape::UsesSeed) { |
| return Shape::SeededHashForObject(key, GetHeap()->HashSeed(), object); |
| } else { |
| return Shape::HashForObject(key, object); |
| } |
| } |
| |
| // Returns a new HashTable object. |
| MUST_USE_RESULT static Handle<Derived> New( |
| Isolate* isolate, int at_least_space_for, |
| MinimumCapacity capacity_option = USE_DEFAULT_MINIMUM_CAPACITY, |
| PretenureFlag pretenure = NOT_TENURED); |
| |
| DECLARE_CAST(HashTable) |
| |
| // Garbage collection support. |
| void IteratePrefix(ObjectVisitor* visitor); |
| void IterateElements(ObjectVisitor* visitor); |
| |
| // Find entry for key otherwise return kNotFound. |
| inline int FindEntry(Key key); |
| inline int FindEntry(Isolate* isolate, Key key, int32_t hash); |
| int FindEntry(Isolate* isolate, Key key); |
| inline bool Has(Isolate* isolate, Key key); |
| inline bool Has(Key key); |
| |
| // Rehashes the table in-place. |
| void Rehash(Key key); |
| |
| // Returns the key at entry. |
| Object* KeyAt(int entry) { return get(EntryToIndex(entry) + kEntryKeyIndex); } |
| |
| static const int kElementsStartIndex = kPrefixStartIndex + Shape::kPrefixSize; |
| static const int kEntrySize = Shape::kEntrySize; |
| STATIC_ASSERT(kEntrySize > 0); |
| static const int kEntryKeyIndex = 0; |
| static const int kElementsStartOffset = |
| kHeaderSize + kElementsStartIndex * kPointerSize; |
| static const int kCapacityOffset = |
| kHeaderSize + kCapacityIndex * kPointerSize; |
| |
| // Returns the index for an entry (of the key) |
| static inline int EntryToIndex(int entry) { |
| return (entry * kEntrySize) + kElementsStartIndex; |
| } |
| |
| protected: |
| friend class ObjectHashTable; |
| |
| // Find the entry at which to insert element with the given key that |
| // has the given hash value. |
| uint32_t FindInsertionEntry(uint32_t hash); |
| |
| // Attempt to shrink hash table after removal of key. |
| MUST_USE_RESULT static Handle<Derived> Shrink(Handle<Derived> table, Key key); |
| |
| // Ensure enough space for n additional elements. |
| MUST_USE_RESULT static Handle<Derived> EnsureCapacity( |
| Handle<Derived> table, |
| int n, |
| Key key, |
| PretenureFlag pretenure = NOT_TENURED); |
| |
| // Returns true if this table has sufficient capacity for adding n elements. |
| bool HasSufficientCapacityToAdd(int number_of_additional_elements); |
| |
| // Sets the capacity of the hash table. |
| void SetCapacity(int capacity) { |
| // To scale a computed hash code to fit within the hash table, we |
| // use bit-wise AND with a mask, so the capacity must be positive |
| // and non-zero. |
| DCHECK(capacity > 0); |
| DCHECK(capacity <= kMaxCapacity); |
| set(kCapacityIndex, Smi::FromInt(capacity)); |
| } |
| |
| // Maximal capacity of HashTable. Based on maximal length of underlying |
| // FixedArray. Staying below kMaxCapacity also ensures that EntryToIndex |
| // cannot overflow. |
| static const int kMaxCapacity = |
| (FixedArray::kMaxLength - kElementsStartOffset) / kEntrySize; |
| |
| private: |
| // Returns _expected_ if one of entries given by the first _probe_ probes is |
| // equal to _expected_. Otherwise, returns the entry given by the probe |
| // number _probe_. |
| uint32_t EntryForProbe(Key key, Object* k, int probe, uint32_t expected); |
| |
| void Swap(uint32_t entry1, uint32_t entry2, WriteBarrierMode mode); |
| |
| // Rehashes this hash-table into the new table. |
| void Rehash(Handle<Derived> new_table, Key key); |
| }; |
| |
| |
| // HashTableKey is an abstract superclass for virtual key behavior. |
| class HashTableKey { |
| public: |
| // Returns whether the other object matches this key. |
| virtual bool IsMatch(Object* other) = 0; |
| // Returns the hash value for this key. |
| virtual uint32_t Hash() = 0; |
| // Returns the hash value for object. |
| virtual uint32_t HashForObject(Object* key) = 0; |
| // Returns the key object for storing into the hash table. |
| MUST_USE_RESULT virtual Handle<Object> AsHandle(Isolate* isolate) = 0; |
| // Required. |
| virtual ~HashTableKey() {} |
| }; |
| |
| |
| class StringTableShape : public BaseShape<HashTableKey*> { |
| public: |
| static inline bool IsMatch(HashTableKey* key, Object* value) { |
| return key->IsMatch(value); |
| } |
| |
| static inline uint32_t Hash(HashTableKey* key) { |
| return key->Hash(); |
| } |
| |
| static inline uint32_t HashForObject(HashTableKey* key, Object* object) { |
| return key->HashForObject(object); |
| } |
| |
| static inline Handle<Object> AsHandle(Isolate* isolate, HashTableKey* key); |
| |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 1; |
| }; |
| |
| class SeqOneByteString; |
| |
| // StringTable. |
| // |
| // No special elements in the prefix and the element size is 1 |
| // because only the string itself (the key) needs to be stored. |
| class StringTable: public HashTable<StringTable, |
| StringTableShape, |
| HashTableKey*> { |
| public: |
| // Find string in the string table. If it is not there yet, it is |
| // added. The return value is the string found. |
| static Handle<String> LookupString(Isolate* isolate, Handle<String> key); |
| static Handle<String> LookupKey(Isolate* isolate, HashTableKey* key); |
| static String* LookupKeyIfExists(Isolate* isolate, HashTableKey* key); |
| |
| // Tries to internalize given string and returns string handle on success |
| // or an empty handle otherwise. |
| MUST_USE_RESULT static MaybeHandle<String> InternalizeStringIfExists( |
| Isolate* isolate, |
| Handle<String> string); |
| |
| // Looks up a string that is equal to the given string and returns |
| // string handle if it is found, or an empty handle otherwise. |
| MUST_USE_RESULT static MaybeHandle<String> LookupStringIfExists( |
| Isolate* isolate, |
| Handle<String> str); |
| MUST_USE_RESULT static MaybeHandle<String> LookupTwoCharsStringIfExists( |
| Isolate* isolate, |
| uint16_t c1, |
| uint16_t c2); |
| |
| static void EnsureCapacityForDeserialization(Isolate* isolate, int expected); |
| |
| DECLARE_CAST(StringTable) |
| |
| private: |
| template <bool seq_one_byte> |
| friend class JsonParser; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StringTable); |
| }; |
| |
| class StringSetShape : public BaseShape<String*> { |
| public: |
| static inline bool IsMatch(String* key, Object* value); |
| static inline uint32_t Hash(String* key); |
| static inline uint32_t HashForObject(String* key, Object* object); |
| |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 1; |
| }; |
| |
| class StringSet : public HashTable<StringSet, StringSetShape, String*> { |
| public: |
| static Handle<StringSet> New(Isolate* isolate); |
| static Handle<StringSet> Add(Handle<StringSet> blacklist, |
| Handle<String> name); |
| bool Has(Handle<String> name); |
| |
| DECLARE_CAST(StringSet) |
| }; |
| |
| template <typename Derived, typename Shape, typename Key> |
| class Dictionary: public HashTable<Derived, Shape, Key> { |
| typedef HashTable<Derived, Shape, Key> DerivedHashTable; |
| |
| public: |
| // Returns the value at entry. |
| Object* ValueAt(int entry) { |
| return this->get(Derived::EntryToIndex(entry) + 1); |
| } |
| |
| // Set the value for entry. |
| void ValueAtPut(int entry, Object* value) { |
| this->set(Derived::EntryToIndex(entry) + 1, value); |
| } |
| |
| // Returns the property details for the property at entry. |
| PropertyDetails DetailsAt(int entry) { |
| return Shape::DetailsAt(static_cast<Derived*>(this), entry); |
| } |
| |
| // Set the details for entry. |
| void DetailsAtPut(int entry, PropertyDetails value) { |
| Shape::DetailsAtPut(static_cast<Derived*>(this), entry, value); |
| } |
| |
| // Returns true if property at given entry is deleted. |
| bool IsDeleted(int entry) { |
| return Shape::IsDeleted(static_cast<Derived*>(this), entry); |
| } |
| |
| // Delete a property from the dictionary. |
| static Handle<Object> DeleteProperty(Handle<Derived> dictionary, int entry); |
| |
| // Attempt to shrink the dictionary after deletion of key. |
| MUST_USE_RESULT static inline Handle<Derived> Shrink( |
| Handle<Derived> dictionary, |
| Key key) { |
| return DerivedHashTable::Shrink(dictionary, key); |
| } |
| |
| // Sorting support |
| // TODO(dcarney): templatize or move to SeededNumberDictionary |
| void CopyValuesTo(FixedArray* elements); |
| |
| // Returns the number of elements in the dictionary filtering out properties |
| // with the specified attributes. |
| int NumberOfElementsFilterAttributes(PropertyFilter filter); |
| |
| // Returns the number of enumerable elements in the dictionary. |
| int NumberOfEnumElements() { |
| return NumberOfElementsFilterAttributes(ENUMERABLE_STRINGS); |
| } |
| |
| enum SortMode { UNSORTED, SORTED }; |
| |
| // Collect the keys into the given KeyAccumulator, in ascending chronological |
| // order of property creation. |
| static void CollectKeysTo(Handle<Dictionary<Derived, Shape, Key>> dictionary, |
| KeyAccumulator* keys); |
| |
| // Copies enumerable keys to preallocated fixed array. |
| static void CopyEnumKeysTo(Handle<Dictionary<Derived, Shape, Key>> dictionary, |
| Handle<FixedArray> storage, KeyCollectionMode mode, |
| KeyAccumulator* accumulator); |
| |
| // Accessors for next enumeration index. |
| void SetNextEnumerationIndex(int index) { |
| DCHECK(index != 0); |
| this->set(kNextEnumerationIndexIndex, Smi::FromInt(index)); |
| } |
| |
| int NextEnumerationIndex() { |
| return Smi::cast(this->get(kNextEnumerationIndexIndex))->value(); |
| } |
| |
| // Creates a new dictionary. |
| MUST_USE_RESULT static Handle<Derived> New( |
| Isolate* isolate, int at_least_space_for, |
| PretenureFlag pretenure = NOT_TENURED, |
| MinimumCapacity capacity_option = USE_DEFAULT_MINIMUM_CAPACITY); |
| |
| // Ensures that a new dictionary is created when the capacity is checked. |
| void SetRequiresCopyOnCapacityChange(); |
| |
| // Ensure enough space for n additional elements. |
| static Handle<Derived> EnsureCapacity(Handle<Derived> obj, int n, Key key); |
| |
| #ifdef OBJECT_PRINT |
| // For our gdb macros, we should perhaps change these in the future. |
| void Print(); |
| |
| void Print(std::ostream& os); // NOLINT |
| #endif |
| // Returns the key (slow). |
| Object* SlowReverseLookup(Object* value); |
| |
| // Sets the entry to (key, value) pair. |
| inline void SetEntry(int entry, |
| Handle<Object> key, |
| Handle<Object> value); |
| inline void SetEntry(int entry, |
| Handle<Object> key, |
| Handle<Object> value, |
| PropertyDetails details); |
| |
| MUST_USE_RESULT static Handle<Derived> Add(Handle<Derived> dictionary, |
| Key key, Handle<Object> value, |
| PropertyDetails details, |
| int* entry_out = nullptr); |
| |
| // Returns iteration indices array for the |dictionary|. |
| // Values are direct indices in the |HashTable| array. |
| static Handle<FixedArray> BuildIterationIndicesArray( |
| Handle<Derived> dictionary); |
| |
| protected: |
| // Generic at put operation. |
| MUST_USE_RESULT static Handle<Derived> AtPut( |
| Handle<Derived> dictionary, |
| Key key, |
| Handle<Object> value); |
| |
| // Add entry to dictionary. Returns entry value. |
| static int AddEntry(Handle<Derived> dictionary, Key key, Handle<Object> value, |
| PropertyDetails details, uint32_t hash); |
| |
| // Generate new enumeration indices to avoid enumeration index overflow. |
| // Returns iteration indices array for the |dictionary|. |
| static Handle<FixedArray> GenerateNewEnumerationIndices( |
| Handle<Derived> dictionary); |
| static const int kMaxNumberKeyIndex = DerivedHashTable::kPrefixStartIndex; |
| static const int kNextEnumerationIndexIndex = kMaxNumberKeyIndex + 1; |
| }; |
| |
| |
| template <typename Derived, typename Shape> |
| class NameDictionaryBase : public Dictionary<Derived, Shape, Handle<Name> > { |
| typedef Dictionary<Derived, Shape, Handle<Name> > DerivedDictionary; |
| |
| public: |
| // Find entry for key, otherwise return kNotFound. Optimized version of |
| // HashTable::FindEntry. |
| int FindEntry(Handle<Name> key); |
| }; |
| |
| |
| template <typename Key> |
| class BaseDictionaryShape : public BaseShape<Key> { |
| public: |
| template <typename Dictionary> |
| static inline PropertyDetails DetailsAt(Dictionary* dict, int entry) { |
| STATIC_ASSERT(Dictionary::kEntrySize == 3); |
| DCHECK(entry >= 0); // Not found is -1, which is not caught by get(). |
| return PropertyDetails(Smi::cast(dict->get( |
| Dictionary::EntryToIndex(entry) + Dictionary::kEntryDetailsIndex))); |
| } |
| |
| template <typename Dictionary> |
| static inline void DetailsAtPut(Dictionary* dict, int entry, |
| PropertyDetails value) { |
| STATIC_ASSERT(Dictionary::kEntrySize == 3); |
| dict->set(Dictionary::EntryToIndex(entry) + Dictionary::kEntryDetailsIndex, |
| value.AsSmi()); |
| } |
| |
| template <typename Dictionary> |
| static bool IsDeleted(Dictionary* dict, int entry) { |
| return false; |
| } |
| |
| template <typename Dictionary> |
| static inline void SetEntry(Dictionary* dict, int entry, Handle<Object> key, |
| Handle<Object> value, PropertyDetails details); |
| }; |
| |
| |
| class NameDictionaryShape : public BaseDictionaryShape<Handle<Name> > { |
| public: |
| static inline bool IsMatch(Handle<Name> key, Object* other); |
| static inline uint32_t Hash(Handle<Name> key); |
| static inline uint32_t HashForObject(Handle<Name> key, Object* object); |
| static inline Handle<Object> AsHandle(Isolate* isolate, Handle<Name> key); |
| static const int kPrefixSize = 2; |
| static const int kEntrySize = 3; |
| static const int kEntryValueIndex = 1; |
| static const int kEntryDetailsIndex = 2; |
| static const bool kIsEnumerable = true; |
| }; |
| |
| |
| class NameDictionary |
| : public NameDictionaryBase<NameDictionary, NameDictionaryShape> { |
| typedef NameDictionaryBase<NameDictionary, NameDictionaryShape> |
| DerivedDictionary; |
| |
| public: |
| DECLARE_CAST(NameDictionary) |
| |
| inline static Handle<FixedArray> DoGenerateNewEnumerationIndices( |
| Handle<NameDictionary> dictionary); |
| |
| static const int kEntryValueIndex = 1; |
| static const int kEntryDetailsIndex = 2; |
| }; |
| |
| |
| class GlobalDictionaryShape : public NameDictionaryShape { |
| public: |
| static const int kEntrySize = 2; // Overrides NameDictionaryShape::kEntrySize |
| |
| template <typename Dictionary> |
| static inline PropertyDetails DetailsAt(Dictionary* dict, int entry); |
| |
| template <typename Dictionary> |
| static inline void DetailsAtPut(Dictionary* dict, int entry, |
| PropertyDetails value); |
| |
| template <typename Dictionary> |
| static bool IsDeleted(Dictionary* dict, int entry); |
| |
| template <typename Dictionary> |
| static inline void SetEntry(Dictionary* dict, int entry, Handle<Object> key, |
| Handle<Object> value, PropertyDetails details); |
| }; |
| |
| |
| class GlobalDictionary |
| : public NameDictionaryBase<GlobalDictionary, GlobalDictionaryShape> { |
| public: |
| DECLARE_CAST(GlobalDictionary) |
| |
| static const int kEntryValueIndex = 1; |
| }; |
| |
| |
| class NumberDictionaryShape : public BaseDictionaryShape<uint32_t> { |
| public: |
| static inline bool IsMatch(uint32_t key, Object* other); |
| static inline Handle<Object> AsHandle(Isolate* isolate, uint32_t key); |
| static const bool kIsEnumerable = false; |
| }; |
| |
| |
| class SeededNumberDictionaryShape : public NumberDictionaryShape { |
| public: |
| static const bool UsesSeed = true; |
| static const int kPrefixSize = 2; |
| static const int kEntrySize = 3; |
| |
| static inline uint32_t SeededHash(uint32_t key, uint32_t seed); |
| static inline uint32_t SeededHashForObject(uint32_t key, |
| uint32_t seed, |
| Object* object); |
| }; |
| |
| |
| class UnseededNumberDictionaryShape : public NumberDictionaryShape { |
| public: |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 2; |
| |
| static inline uint32_t Hash(uint32_t key); |
| static inline uint32_t HashForObject(uint32_t key, Object* object); |
| |
| template <typename Dictionary> |
| static inline PropertyDetails DetailsAt(Dictionary* dict, int entry) { |
| UNREACHABLE(); |
| return PropertyDetails::Empty(); |
| } |
| |
| template <typename Dictionary> |
| static inline void DetailsAtPut(Dictionary* dict, int entry, |
| PropertyDetails value) { |
| UNREACHABLE(); |
| } |
| |
| static inline Map* GetMap(Isolate* isolate); |
| }; |
| |
| |
| class SeededNumberDictionary |
| : public Dictionary<SeededNumberDictionary, |
| SeededNumberDictionaryShape, |
| uint32_t> { |
| public: |
| DECLARE_CAST(SeededNumberDictionary) |
| |
| // Type specific at put (default NONE attributes is used when adding). |
| MUST_USE_RESULT static Handle<SeededNumberDictionary> AtNumberPut( |
| Handle<SeededNumberDictionary> dictionary, uint32_t key, |
| Handle<Object> value, bool used_as_prototype); |
| MUST_USE_RESULT static Handle<SeededNumberDictionary> AddNumberEntry( |
| Handle<SeededNumberDictionary> dictionary, uint32_t key, |
| Handle<Object> value, PropertyDetails details, bool used_as_prototype); |
| |
| // Set an existing entry or add a new one if needed. |
| // Return the updated dictionary. |
| MUST_USE_RESULT static Handle<SeededNumberDictionary> Set( |
| Handle<SeededNumberDictionary> dictionary, uint32_t key, |
| Handle<Object> value, PropertyDetails details, bool used_as_prototype); |
| |
| void UpdateMaxNumberKey(uint32_t key, bool used_as_prototype); |
| |
| // Returns true if the dictionary contains any elements that are non-writable, |
| // non-configurable, non-enumerable, or have getters/setters. |
| bool HasComplexElements(); |
| |
| // If slow elements are required we will never go back to fast-case |
| // for the elements kept in this dictionary. We require slow |
| // elements if an element has been added at an index larger than |
| // kRequiresSlowElementsLimit or set_requires_slow_elements() has been called |
| // when defining a getter or setter with a number key. |
| inline bool requires_slow_elements(); |
| inline void set_requires_slow_elements(); |
| |
| // Get the value of the max number key that has been added to this |
| // dictionary. max_number_key can only be called if |
| // requires_slow_elements returns false. |
| inline uint32_t max_number_key(); |
| |
| static const int kEntryValueIndex = 1; |
| static const int kEntryDetailsIndex = 2; |
| |
| // Bit masks. |
| static const int kRequiresSlowElementsMask = 1; |
| static const int kRequiresSlowElementsTagSize = 1; |
| static const uint32_t kRequiresSlowElementsLimit = (1 << 29) - 1; |
| }; |
| |
| |
| class UnseededNumberDictionary |
| : public Dictionary<UnseededNumberDictionary, |
| UnseededNumberDictionaryShape, |
| uint32_t> { |
| public: |
| DECLARE_CAST(UnseededNumberDictionary) |
| |
| // Type specific at put (default NONE attributes is used when adding). |
| MUST_USE_RESULT static Handle<UnseededNumberDictionary> AtNumberPut( |
| Handle<UnseededNumberDictionary> dictionary, |
| uint32_t key, |
| Handle<Object> value); |
| MUST_USE_RESULT static Handle<UnseededNumberDictionary> AddNumberEntry( |
| Handle<UnseededNumberDictionary> dictionary, |
| uint32_t key, |
| Handle<Object> value); |
| static Handle<UnseededNumberDictionary> DeleteKey( |
| Handle<UnseededNumberDictionary> dictionary, uint32_t key); |
| |
| // Set an existing entry or add a new one if needed. |
| // Return the updated dictionary. |
| MUST_USE_RESULT static Handle<UnseededNumberDictionary> Set( |
| Handle<UnseededNumberDictionary> dictionary, |
| uint32_t key, |
| Handle<Object> value); |
| |
| static const int kEntryValueIndex = 1; |
| static const int kEntryDetailsIndex = 2; |
| }; |
| |
| |
| class ObjectHashTableShape : public BaseShape<Handle<Object> > { |
| public: |
| static inline bool IsMatch(Handle<Object> key, Object* other); |
| static inline uint32_t Hash(Handle<Object> key); |
| static inline uint32_t HashForObject(Handle<Object> key, Object* object); |
| static inline Handle<Object> AsHandle(Isolate* isolate, Handle<Object> key); |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 2; |
| }; |
| |
| |
| // ObjectHashTable maps keys that are arbitrary objects to object values by |
| // using the identity hash of the key for hashing purposes. |
| class ObjectHashTable: public HashTable<ObjectHashTable, |
| ObjectHashTableShape, |
| Handle<Object> > { |
| typedef HashTable< |
| ObjectHashTable, ObjectHashTableShape, Handle<Object> > DerivedHashTable; |
| public: |
| DECLARE_CAST(ObjectHashTable) |
| |
| // Attempt to shrink hash table after removal of key. |
| MUST_USE_RESULT static inline Handle<ObjectHashTable> Shrink( |
| Handle<ObjectHashTable> table, |
| Handle<Object> key); |
| |
| // Looks up the value associated with the given key. The hole value is |
| // returned in case the key is not present. |
| Object* Lookup(Handle<Object> key); |
| Object* Lookup(Handle<Object> key, int32_t hash); |
| Object* Lookup(Isolate* isolate, Handle<Object> key, int32_t hash); |
| |
| // Adds (or overwrites) the value associated with the given key. |
| static Handle<ObjectHashTable> Put(Handle<ObjectHashTable> table, |
| Handle<Object> key, |
| Handle<Object> value); |
| static Handle<ObjectHashTable> Put(Handle<ObjectHashTable> table, |
| Handle<Object> key, Handle<Object> value, |
| int32_t hash); |
| |
| // Returns an ObjectHashTable (possibly |table|) where |key| has been removed. |
| static Handle<ObjectHashTable> Remove(Handle<ObjectHashTable> table, |
| Handle<Object> key, |
| bool* was_present); |
| static Handle<ObjectHashTable> Remove(Handle<ObjectHashTable> table, |
| Handle<Object> key, bool* was_present, |
| int32_t hash); |
| |
| protected: |
| friend class MarkCompactCollector; |
| |
| void AddEntry(int entry, Object* key, Object* value); |
| void RemoveEntry(int entry); |
| |
| // Returns the index to the value of an entry. |
| static inline int EntryToValueIndex(int entry) { |
| return EntryToIndex(entry) + 1; |
| } |
| }; |
| |
| class ObjectHashSetShape : public ObjectHashTableShape { |
| public: |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 1; |
| }; |
| |
| class ObjectHashSet |
| : public HashTable<ObjectHashSet, ObjectHashSetShape, Handle<Object>> { |
| public: |
| static Handle<ObjectHashSet> Add(Handle<ObjectHashSet> set, |
| Handle<Object> key); |
| |
| inline bool Has(Isolate* isolate, Handle<Object> key, int32_t hash); |
| inline bool Has(Isolate* isolate, Handle<Object> key); |
| |
| DECLARE_CAST(ObjectHashSet) |
| }; |
| |
| // OrderedHashTable is a HashTable with Object keys that preserves |
| // insertion order. There are Map and Set interfaces (OrderedHashMap |
| // and OrderedHashTable, below). It is meant to be used by JSMap/JSSet. |
| // |
| // Only Object* keys are supported, with Object::SameValueZero() used as the |
| // equality operator and Object::GetHash() for the hash function. |
| // |
| // Based on the "Deterministic Hash Table" as described by Jason Orendorff at |
| // https://wiki.mozilla.org/User:Jorend/Deterministic_hash_tables |
| // Originally attributed to Tyler Close. |
| // |
| // Memory layout: |
| // [0]: bucket count |
| // [1]: element count |
| // [2]: deleted element count |
| // [3..(3 + NumberOfBuckets() - 1)]: "hash table", where each item is an |
| // offset into the data table (see below) where the |
| // first item in this bucket is stored. |
| // [3 + NumberOfBuckets()..length]: "data table", an array of length |
| // Capacity() * kEntrySize, where the first entrysize |
| // items are handled by the derived class and the |
| // item at kChainOffset is another entry into the |
| // data table indicating the next entry in this hash |
| // bucket. |
| // |
| // When we transition the table to a new version we obsolete it and reuse parts |
| // of the memory to store information how to transition an iterator to the new |
| // table: |
| // |
| // Memory layout for obsolete table: |
| // [0]: bucket count |
| // [1]: Next newer table |
| // [2]: Number of removed holes or -1 when the table was cleared. |
| // [3..(3 + NumberOfRemovedHoles() - 1)]: The indexes of the removed holes. |
| // [3 + NumberOfRemovedHoles()..length]: Not used |
| // |
| template<class Derived, class Iterator, int entrysize> |
| class OrderedHashTable: public FixedArray { |
| public: |
| // Returns an OrderedHashTable with a capacity of at least |capacity|. |
| static Handle<Derived> Allocate( |
| Isolate* isolate, int capacity, PretenureFlag pretenure = NOT_TENURED); |
| |
| // Returns an OrderedHashTable (possibly |table|) with enough space |
| // to add at least one new element. |
| static Handle<Derived> EnsureGrowable(Handle<Derived> table); |
| |
| // Returns an OrderedHashTable (possibly |table|) that's shrunken |
| // if possible. |
| static Handle<Derived> Shrink(Handle<Derived> table); |
| |
| // Returns a new empty OrderedHashTable and records the clearing so that |
| // existing iterators can be updated. |
| static Handle<Derived> Clear(Handle<Derived> table); |
| |
| // Returns a true if the OrderedHashTable contains the key |
| static bool HasKey(Handle<Derived> table, Handle<Object> key); |
| |
| int NumberOfElements() { |
| return Smi::cast(get(kNumberOfElementsIndex))->value(); |
| } |
| |
| int NumberOfDeletedElements() { |
| return Smi::cast(get(kNumberOfDeletedElementsIndex))->value(); |
| } |
| |
| // Returns the number of contiguous entries in the data table, starting at 0, |
| // that either are real entries or have been deleted. |
| int UsedCapacity() { return NumberOfElements() + NumberOfDeletedElements(); } |
| |
| int NumberOfBuckets() { |
| return Smi::cast(get(kNumberOfBucketsIndex))->value(); |
| } |
| |
| // Returns an index into |this| for the given entry. |
| int EntryToIndex(int entry) { |
| return kHashTableStartIndex + NumberOfBuckets() + (entry * kEntrySize); |
| } |
| |
| int HashToBucket(int hash) { return hash & (NumberOfBuckets() - 1); } |
| |
| int HashToEntry(int hash) { |
| int bucket = HashToBucket(hash); |
| Object* entry = this->get(kHashTableStartIndex + bucket); |
| return Smi::cast(entry)->value(); |
| } |
| |
| int KeyToFirstEntry(Isolate* isolate, Object* key) { |
| Object* hash = key->GetHash(); |
| // If the object does not have an identity hash, it was never used as a key |
| if (hash->IsUndefined(isolate)) return kNotFound; |
| return HashToEntry(Smi::cast(hash)->value()); |
| } |
| |
| int NextChainEntry(int entry) { |
| Object* next_entry = get(EntryToIndex(entry) + kChainOffset); |
| return Smi::cast(next_entry)->value(); |
| } |
| |
| // use KeyAt(i)->IsTheHole(isolate) to determine if this is a deleted entry. |
| Object* KeyAt(int entry) { |
| DCHECK_LT(entry, this->UsedCapacity()); |
| return get(EntryToIndex(entry)); |
| } |
| |
| bool IsObsolete() { |
| return !get(kNextTableIndex)->IsSmi(); |
| } |
| |
| // The next newer table. This is only valid if the table is obsolete. |
| Derived* NextTable() { |
| return Derived::cast(get(kNextTableIndex)); |
| } |
| |
| // When the table is obsolete we store the indexes of the removed holes. |
| int RemovedIndexAt(int index) { |
| return Smi::cast(get(kRemovedHolesIndex + index))->value(); |
| } |
| |
| static const int kNotFound = -1; |
| static const int kMinCapacity = 4; |
| |
| static const int kNumberOfBucketsIndex = 0; |
| static const int kNumberOfElementsIndex = kNumberOfBucketsIndex + 1; |
| static const int kNumberOfDeletedElementsIndex = kNumberOfElementsIndex + 1; |
| static const int kHashTableStartIndex = kNumberOfDeletedElementsIndex + 1; |
| static const int kNextTableIndex = kNumberOfElementsIndex; |
| |
| static const int kNumberOfBucketsOffset = |
| kHeaderSize + kNumberOfBucketsIndex * kPointerSize; |
| static const int kNumberOfElementsOffset = |
| kHeaderSize + kNumberOfElementsIndex * kPointerSize; |
| static const int kNumberOfDeletedElementsOffset = |
| kHeaderSize + kNumberOfDeletedElementsIndex * kPointerSize; |
| static const int kHashTableStartOffset = |
| kHeaderSize + kHashTableStartIndex * kPointerSize; |
| static const int kNextTableOffset = |
| kHeaderSize + kNextTableIndex * kPointerSize; |
| |
| static const int kEntrySize = entrysize + 1; |
| static const int kChainOffset = entrysize; |
| |
| static const int kLoadFactor = 2; |
| |
| // NumberOfDeletedElements is set to kClearedTableSentinel when |
| // the table is cleared, which allows iterator transitions to |
| // optimize that case. |
| static const int kClearedTableSentinel = -1; |
| |
| protected: |
| static Handle<Derived> Rehash(Handle<Derived> table, int new_capacity); |
| |
| void SetNumberOfBuckets(int num) { |
| set(kNumberOfBucketsIndex, Smi::FromInt(num)); |
| } |
| |
| void SetNumberOfElements(int num) { |
| set(kNumberOfElementsIndex, Smi::FromInt(num)); |
| } |
| |
| void SetNumberOfDeletedElements(int num) { |
| set(kNumberOfDeletedElementsIndex, Smi::FromInt(num)); |
| } |
| |
| // Returns the number elements that can fit into the allocated buffer. |
| int Capacity() { |
| return NumberOfBuckets() * kLoadFactor; |
| } |
| |
| void SetNextTable(Derived* next_table) { |
| set(kNextTableIndex, next_table); |
| } |
| |
| void SetRemovedIndexAt(int index, int removed_index) { |
| return set(kRemovedHolesIndex + index, Smi::FromInt(removed_index)); |
| } |
| |
| static const int kRemovedHolesIndex = kHashTableStartIndex; |
| |
| static const int kMaxCapacity = |
| (FixedArray::kMaxLength - kHashTableStartIndex) |
| / (1 + (kEntrySize * kLoadFactor)); |
| }; |
| |
| |
| class JSSetIterator; |
| |
| |
| class OrderedHashSet: public OrderedHashTable< |
| OrderedHashSet, JSSetIterator, 1> { |
| public: |
| DECLARE_CAST(OrderedHashSet) |
| |
| static Handle<OrderedHashSet> Add(Handle<OrderedHashSet> table, |
| Handle<Object> value); |
| static Handle<FixedArray> ConvertToKeysArray(Handle<OrderedHashSet> table, |
| GetKeysConversion convert); |
| }; |
| |
| |
| class JSMapIterator; |
| |
| |
| class OrderedHashMap |
| : public OrderedHashTable<OrderedHashMap, JSMapIterator, 2> { |
| public: |
| DECLARE_CAST(OrderedHashMap) |
| |
| inline Object* ValueAt(int entry); |
| |
| static const int kValueOffset = 1; |
| }; |
| |
| |
| template <int entrysize> |
| class WeakHashTableShape : public BaseShape<Handle<Object> > { |
| public: |
| static inline bool IsMatch(Handle<Object> key, Object* other); |
| static inline uint32_t Hash(Handle<Object> key); |
| static inline uint32_t HashForObject(Handle<Object> key, Object* object); |
| static inline Handle<Object> AsHandle(Isolate* isolate, Handle<Object> key); |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = entrysize; |
| }; |
| |
| |
| // WeakHashTable maps keys that are arbitrary heap objects to heap object |
| // values. The table wraps the keys in weak cells and store values directly. |
| // Thus it references keys weakly and values strongly. |
| class WeakHashTable: public HashTable<WeakHashTable, |
| WeakHashTableShape<2>, |
| Handle<Object> > { |
| typedef HashTable< |
| WeakHashTable, WeakHashTableShape<2>, Handle<Object> > DerivedHashTable; |
| public: |
| DECLARE_CAST(WeakHashTable) |
| |
| // Looks up the value associated with the given key. The hole value is |
| // returned in case the key is not present. |
| Object* Lookup(Handle<HeapObject> key); |
| |
| // Adds (or overwrites) the value associated with the given key. Mapping a |
| // key to the hole value causes removal of the whole entry. |
| MUST_USE_RESULT static Handle<WeakHashTable> Put(Handle<WeakHashTable> table, |
| Handle<HeapObject> key, |
| Handle<HeapObject> value); |
| |
| static Handle<FixedArray> GetValues(Handle<WeakHashTable> table); |
| |
| private: |
| friend class MarkCompactCollector; |
| |
| void AddEntry(int entry, Handle<WeakCell> key, Handle<HeapObject> value); |
| |
| // Returns the index to the value of an entry. |
| static inline int EntryToValueIndex(int entry) { |
| return EntryToIndex(entry) + 1; |
| } |
| }; |
| |
| |
| // ScopeInfo represents information about different scopes of a source |
| // program and the allocation of the scope's variables. Scope information |
| // is stored in a compressed form in ScopeInfo objects and is used |
| // at runtime (stack dumps, deoptimization, etc.). |
| |
| // This object provides quick access to scope info details for runtime |
| // routines. |
| class ScopeInfo : public FixedArray { |
| public: |
| DECLARE_CAST(ScopeInfo) |
| |
| // Return the type of this scope. |
| ScopeType scope_type(); |
| |
| // Does this scope call eval? |
| bool CallsEval(); |
| |
| // Return the language mode of this scope. |
| LanguageMode language_mode(); |
| |
| // True if this scope is a (var) declaration scope. |
| bool is_declaration_scope(); |
| |
| // Does this scope make a sloppy eval call? |
| bool CallsSloppyEval() { return CallsEval() && is_sloppy(language_mode()); } |
| |
| // Return the total number of locals allocated on the stack and in the |
| // context. This includes the parameters that are allocated in the context. |
| int LocalCount(); |
| |
| // Return the number of stack slots for code. This number consists of two |
| // parts: |
| // 1. One stack slot per stack allocated local. |
| // 2. One stack slot for the function name if it is stack allocated. |
| int StackSlotCount(); |
| |
| // Return the number of context slots for code if a context is allocated. This |
| // number consists of three parts: |
| // 1. Size of fixed header for every context: Context::MIN_CONTEXT_SLOTS |
| // 2. One context slot per context allocated local. |
| // 3. One context slot for the function name if it is context allocated. |
| // Parameters allocated in the context count as context allocated locals. If |
| // no contexts are allocated for this scope ContextLength returns 0. |
| int ContextLength(); |
| |
| // Does this scope declare a "this" binding? |
| bool HasReceiver(); |
| |
| // Does this scope declare a "this" binding, and the "this" binding is stack- |
| // or context-allocated? |
| bool HasAllocatedReceiver(); |
| |
| // Does this scope declare a "new.target" binding? |
| bool HasNewTarget(); |
| |
| // Is this scope the scope of a named function expression? |
| bool HasFunctionName(); |
| |
| // Return if this has context allocated locals. |
| bool HasHeapAllocatedLocals(); |
| |
| // Return if contexts are allocated for this scope. |
| bool HasContext(); |
| |
| // Return if this is a function scope with "use asm". |
| inline bool IsAsmModule(); |
| |
| // Return if this is a nested function within an asm module scope. |
| inline bool IsAsmFunction(); |
| |
| inline bool HasSimpleParameters(); |
| |
| // Return the function_name if present. |
| String* FunctionName(); |
| |
| ModuleInfo* ModuleDescriptorInfo(); |
| |
| // Return the name of the given parameter. |
| String* ParameterName(int var); |
| |
| // Return the name of the given local. |
| String* LocalName(int var); |
| |
| // Return the name of the given stack local. |
| String* StackLocalName(int var); |
| |
| // Return the name of the given stack local. |
| int StackLocalIndex(int var); |
| |
| // Return the name of the given context local. |
| String* ContextLocalName(int var); |
| |
| // Return the mode of the given context local. |
| VariableMode ContextLocalMode(int var); |
| |
| // Return the initialization flag of the given context local. |
| InitializationFlag ContextLocalInitFlag(int var); |
| |
| // Return the initialization flag of the given context local. |
| MaybeAssignedFlag ContextLocalMaybeAssignedFlag(int var); |
| |
| // Return true if this local was introduced by the compiler, and should not be |
| // exposed to the user in a debugger. |
| static bool VariableIsSynthetic(String* name); |
| |
| // Lookup support for serialized scope info. Returns the |
| // the stack slot index for a given slot name if the slot is |
| // present; otherwise returns a value < 0. The name must be an internalized |
| // string. |
| int StackSlotIndex(String* name); |
| |
| // Lookup support for serialized scope info. Returns the local context slot |
| // index for a given slot name if the slot is present; otherwise |
| // returns a value < 0. The name must be an internalized string. |
| // If the slot is present and mode != NULL, sets *mode to the corresponding |
| // mode for that variable. |
| static int ContextSlotIndex(Handle<ScopeInfo> scope_info, Handle<String> name, |
| VariableMode* mode, InitializationFlag* init_flag, |
| MaybeAssignedFlag* maybe_assigned_flag); |
| |
| // Lookup metadata of a MODULE-allocated variable. Return a negative value if |
| // there is no module variable with the given name. |
| int ModuleIndex(Handle<String> name, VariableMode* mode, |
| InitializationFlag* init_flag, |
| MaybeAssignedFlag* maybe_assigned_flag); |
| |
| // Lookup the name of a certain context slot by its index. |
| String* ContextSlotName(int slot_index); |
| |
| // Lookup support for serialized scope info. Returns the |
| // parameter index for a given parameter name if the parameter is present; |
| // otherwise returns a value < 0. The name must be an internalized string. |
| int ParameterIndex(String* name); |
| |
| // Lookup support for serialized scope info. Returns the function context |
| // slot index if the function name is present and context-allocated (named |
| // function expressions, only), otherwise returns a value < 0. The name |
| // must be an internalized string. |
| int FunctionContextSlotIndex(String* name); |
| |
| // Lookup support for serialized scope info. Returns the receiver context |
| // slot index if scope has a "this" binding, and the binding is |
| // context-allocated. Otherwise returns a value < 0. |
| int ReceiverContextSlotIndex(); |
| |
| FunctionKind function_kind(); |
| |
| static Handle<ScopeInfo> Create(Isolate* isolate, Zone* zone, Scope* scope); |
| static Handle<ScopeInfo> CreateGlobalThisBinding(Isolate* isolate); |
| |
| // Serializes empty scope info. |
| static ScopeInfo* Empty(Isolate* isolate); |
| |
| #ifdef DEBUG |
| void Print(); |
| #endif |
| |
| // The layout of the static part of a ScopeInfo is as follows. Each entry is |
| // numeric and occupies one array slot. |
| // 1. A set of properties of the scope |
| // 2. The number of parameters. For non-function scopes this is 0. |
| // 3. The number of non-parameter variables allocated on the stack. |
| // 4. The number of non-parameter and parameter variables allocated in the |
| // context. |
| #define FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(V) \ |
| V(Flags) \ |
| V(ParameterCount) \ |
| V(StackLocalCount) \ |
| V(ContextLocalCount) |
| |
| #define FIELD_ACCESSORS(name) \ |
| inline void Set##name(int value); \ |
| inline int name(); |
| FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(FIELD_ACCESSORS) |
| #undef FIELD_ACCESSORS |
| |
| enum { |
| #define DECL_INDEX(name) k##name, |
| FOR_EACH_SCOPE_INFO_NUMERIC_FIELD(DECL_INDEX) |
| #undef DECL_INDEX |
| kVariablePartIndex |
| }; |
| |
| private: |
| // The layout of the variable part of a ScopeInfo is as follows: |
| // 1. ParameterEntries: |
| // This part stores the names of the parameters for function scopes. One |
| // slot is used per parameter, so in total this part occupies |
| // ParameterCount() slots in the array. For other scopes than function |
| // scopes ParameterCount() is 0. |
| // 2. StackLocalFirstSlot: |
| // Index of a first stack slot for stack local. Stack locals belonging to |
| // this scope are located on a stack at slots starting from this index. |
| // 3. StackLocalEntries: |
| // Contains the names of local variables that are allocated on the stack, |
| // in increasing order of the stack slot index. First local variable has a |
| // stack slot index defined in StackLocalFirstSlot (point 2 above). |
| // One slot is used per stack local, so in total this part occupies |
| // StackLocalCount() slots in the array. |
| // 4. ContextLocalNameEntries: |
| // Contains the names of local variables and parameters that are allocated |
| // in the context. They are stored in increasing order of the context slot |
| // index starting with Context::MIN_CONTEXT_SLOTS. One slot is used per |
| // context local, so in total this part occupies ContextLocalCount() slots |
| // in the array. |
| // 5. ContextLocalInfoEntries: |
| // Contains the variable modes and initialization flags corresponding to |
| // the context locals in ContextLocalNameEntries. One slot is used per |
| // context local, so in total this part occupies ContextLocalCount() |
| // slots in the array. |
| // 6. ReceiverEntry: |
| // If the scope binds a "this" value, one slot is reserved to hold the |
| // context or stack slot index for the variable. |
| // 7. FunctionNameEntry: |
| // If the scope belongs to a named function expression this part contains |
| // information about the function variable. It always occupies two array |
| // slots: a. The name of the function variable. |
| // b. The context or stack slot index for the variable. |
| // 8. ModuleInfoEntry, ModuleVariableCount, and ModuleVariableEntries: |
| // For a module scope, this part contains the ModuleInfo, the number of |
| // MODULE-allocated variables, and the metadata of those variables. For |
| // non-module scopes it is empty. |
| int ParameterEntriesIndex(); |
| int StackLocalFirstSlotIndex(); |
| int StackLocalEntriesIndex(); |
| int ContextLocalNameEntriesIndex(); |
| int ContextLocalInfoEntriesIndex(); |
| int ReceiverEntryIndex(); |
| int FunctionNameEntryIndex(); |
| int ModuleInfoEntryIndex(); |
| int ModuleVariableCountIndex(); |
| int ModuleVariableEntriesIndex(); |
| |
| int Lookup(Handle<String> name, int start, int end, VariableMode* mode, |
| VariableLocation* location, InitializationFlag* init_flag, |
| MaybeAssignedFlag* maybe_assigned_flag); |
| |
| // Used for the function name variable for named function expressions, and for |
| // the receiver. |
| enum VariableAllocationInfo { NONE, STACK, CONTEXT, UNUSED }; |
| |
| // Properties of scopes. |
| class ScopeTypeField : public BitField<ScopeType, 0, 4> {}; |
| class CallsEvalField : public BitField<bool, ScopeTypeField::kNext, 1> {}; |
| STATIC_ASSERT(LANGUAGE_END == 2); |
| class LanguageModeField |
| : public BitField<LanguageMode, CallsEvalField::kNext, 1> {}; |
| class DeclarationScopeField |
| : public BitField<bool, LanguageModeField::kNext, 1> {}; |
| class ReceiverVariableField |
| : public BitField<VariableAllocationInfo, DeclarationScopeField::kNext, |
| 2> {}; |
| class HasNewTargetField |
| : public BitField<bool, ReceiverVariableField::kNext, 1> {}; |
| class FunctionVariableField |
| : public BitField<VariableAllocationInfo, HasNewTargetField::kNext, 2> {}; |
| class AsmModuleField |
| : public BitField<bool, FunctionVariableField::kNext, 1> {}; |
| class AsmFunctionField : public BitField<bool, AsmModuleField::kNext, 1> {}; |
| class HasSimpleParametersField |
| : public BitField<bool, AsmFunctionField::kNext, 1> {}; |
| class FunctionKindField |
| : public BitField<FunctionKind, HasSimpleParametersField::kNext, 9> {}; |
| |
| // Properties of variables. |
| class VariableModeField : public BitField<VariableMode, 0, 3> {}; |
| class InitFlagField : public BitField<InitializationFlag, 3, 1> {}; |
| class MaybeAssignedFlagField : public BitField<MaybeAssignedFlag, 4, 1> {}; |
| |
| friend class ScopeIterator; |
| }; |
| |
| // ModuleInfo is to ModuleDescriptor what ScopeInfo is to Scope. |
| class ModuleInfo : public FixedArray { |
| public: |
| DECLARE_CAST(ModuleInfo) |
| static Handle<ModuleInfo> New(Isolate* isolate, ModuleDescriptor* descr); |
| inline FixedArray* special_exports() const; |
| inline FixedArray* regular_exports() const; |
| |
| private: |
| friend class Factory; |
| enum { kSpecialExportsIndex, kRegularExportsIndex, kLength }; |
| }; |
| |
| // The cache for maps used by normalized (dictionary mode) objects. |
| // Such maps do not have property descriptors, so a typical program |
| // needs very limited number of distinct normalized maps. |
| class NormalizedMapCache: public FixedArray { |
| public: |
| static Handle<NormalizedMapCache> New(Isolate* isolate); |
| |
| MUST_USE_RESULT MaybeHandle<Map> Get(Handle<Map> fast_map, |
| PropertyNormalizationMode mode); |
| void Set(Handle<Map> fast_map, Handle<Map> normalized_map); |
| |
| void Clear(); |
| |
| DECLARE_CAST(NormalizedMapCache) |
| |
| static inline bool IsNormalizedMapCache(const HeapObject* obj); |
| |
| DECLARE_VERIFIER(NormalizedMapCache) |
| private: |
| static const int kEntries = 64; |
| |
| static inline int GetIndex(Handle<Map> map); |
| |
| // The following declarations hide base class methods. |
| Object* get(int index); |
| void set(int index, Object* value); |
| }; |
| |
| // HandlerTable is a fixed array containing entries for exception handlers in |
| // the code object it is associated with. The tables comes in two flavors: |
| // 1) Based on ranges: Used for unoptimized code. Contains one entry per |
| // exception handler and a range representing the try-block covered by that |
| // handler. Layout looks as follows: |
| // [ range-start , range-end , handler-offset , handler-data ] |
| // 2) Based on return addresses: Used for turbofanned code. Contains one entry |
| // per call-site that could throw an exception. Layout looks as follows: |
| // [ return-address-offset , handler-offset ] |
| class HandlerTable : public FixedArray { |
| public: |
| // Conservative prediction whether a given handler will locally catch an |
| // exception or cause a re-throw to outside the code boundary. Since this is |
| // undecidable it is merely an approximation (e.g. useful for debugger). |
| enum CatchPrediction { |
| UNCAUGHT, // The handler will (likely) rethrow the exception. |
| CAUGHT, // The exception will be caught by the handler. |
| PROMISE, // The exception will be caught and cause a promise rejection. |
| DESUGARING, // The exception will be caught, but both the exception and the |
| // catching are part of a desugaring and should therefore not |
| // be visible to the user (we won't notify the debugger of such |
| // exceptions). |
| }; |
| |
| // Getters for handler table based on ranges. |
| inline int GetRangeStart(int index) const; |
| inline int GetRangeEnd(int index) const; |
| inline int GetRangeHandler(int index) const; |
| inline int GetRangeData(int index) const; |
| |
| // Setters for handler table based on ranges. |
| inline void SetRangeStart(int index, int value); |
| inline void SetRangeEnd(int index, int value); |
| inline void SetRangeHandler(int index, int offset, CatchPrediction pred); |
| inline void SetRangeData(int index, int value); |
| |
| // Setters for handler table based on return addresses. |
| inline void SetReturnOffset(int index, int value); |
| inline void SetReturnHandler(int index, int offset); |
| |
| // Lookup handler in a table based on ranges. |
| int LookupRange(int pc_offset, int* data, CatchPrediction* prediction); |
| |
| // Lookup handler in a table based on return addresses. |
| int LookupReturn(int pc_offset); |
| |
| // Returns the number of entries in the table. |
| inline int NumberOfRangeEntries() const; |
| |
| // Returns the required length of the underlying fixed array. |
| static int LengthForRange(int entries) { return entries * kRangeEntrySize; } |
| static int LengthForReturn(int entries) { return entries * kReturnEntrySize; } |
| |
| DECLARE_CAST(HandlerTable) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void HandlerTableRangePrint(std::ostream& os); // NOLINT |
| void HandlerTableReturnPrint(std::ostream& os); // NOLINT |
| #endif |
| |
| private: |
| // Layout description for handler table based on ranges. |
| static const int kRangeStartIndex = 0; |
| static const int kRangeEndIndex = 1; |
| static const int kRangeHandlerIndex = 2; |
| static const int kRangeDataIndex = 3; |
| static const int kRangeEntrySize = 4; |
| |
| // Layout description for handler table based on return addresses. |
| static const int kReturnOffsetIndex = 0; |
| static const int kReturnHandlerIndex = 1; |
| static const int kReturnEntrySize = 2; |
| |
| // Encoding of the {handler} field. |
| class HandlerPredictionField : public BitField<CatchPrediction, 0, 2> {}; |
| class HandlerOffsetField : public BitField<int, 2, 30> {}; |
| }; |
| |
| // ByteArray represents fixed sized byte arrays. Used for the relocation info |
| // that is attached to code objects. |
| class ByteArray: public FixedArrayBase { |
| public: |
| inline int Size(); |
| |
| // Setter and getter. |
| inline byte get(int index); |
| inline void set(int index, byte value); |
| inline const byte* data() const; |
| |
| // Copy in / copy out whole byte slices. |
| inline void copy_out(int index, byte* buffer, int length); |
| inline void copy_in(int index, const byte* buffer, int length); |
| |
| // Treat contents as an int array. |
| inline int get_int(int index); |
| inline void set_int(int index, int value); |
| |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length); |
| } |
| // We use byte arrays for free blocks in the heap. Given a desired size in |
| // bytes that is a multiple of the word size and big enough to hold a byte |
| // array, this function returns the number of elements a byte array should |
| // have. |
| static int LengthFor(int size_in_bytes) { |
| DCHECK(IsAligned(size_in_bytes, kPointerSize)); |
| DCHECK(size_in_bytes >= kHeaderSize); |
| return size_in_bytes - kHeaderSize; |
| } |
| |
| // Returns data start address. |
| inline Address GetDataStartAddress(); |
| |
| // Returns a pointer to the ByteArray object for a given data start address. |
| static inline ByteArray* FromDataStartAddress(Address address); |
| |
| DECLARE_CAST(ByteArray) |
| |
| // Dispatched behavior. |
| inline int ByteArraySize(); |
| DECLARE_PRINTER(ByteArray) |
| DECLARE_VERIFIER(ByteArray) |
| |
| // Layout description. |
| static const int kAlignedSize = OBJECT_POINTER_ALIGN(kHeaderSize); |
| |
| // Maximal memory consumption for a single ByteArray. |
| static const int kMaxSize = 512 * MB; |
| // Maximal length of a single ByteArray. |
| static const int kMaxLength = kMaxSize - kHeaderSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ByteArray); |
| }; |
| |
| |
| // BytecodeArray represents a sequence of interpreter bytecodes. |
| class BytecodeArray : public FixedArrayBase { |
| public: |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length); |
| } |
| |
| // Setter and getter |
| inline byte get(int index); |
| inline void set(int index, byte value); |
| |
| // Returns data start address. |
| inline Address GetFirstBytecodeAddress(); |
| |
| // Accessors for frame size. |
| inline int frame_size() const; |
| inline void set_frame_size(int frame_size); |
| |
| // Accessor for register count (derived from frame_size). |
| inline int register_count() const; |
| |
| // Accessors for parameter count (including implicit 'this' receiver). |
| inline int parameter_count() const; |
| inline void set_parameter_count(int number_of_parameters); |
| |
| // Accessors for profiling count. |
| inline int interrupt_budget() const; |
| inline void set_interrupt_budget(int interrupt_budget); |
| |
| // Accessors for OSR loop nesting level. |
| inline int osr_loop_nesting_level() const; |
| inline void set_osr_loop_nesting_level(int depth); |
| |
| // Accessors for the constant pool. |
| DECL_ACCESSORS(constant_pool, FixedArray) |
| |
| // Accessors for handler table containing offsets of exception handlers. |
| DECL_ACCESSORS(handler_table, FixedArray) |
| |
| // Accessors for source position table containing mappings between byte code |
| // offset and source position. |
| DECL_ACCESSORS(source_position_table, ByteArray) |
| |
| DECLARE_CAST(BytecodeArray) |
| |
| // Dispatched behavior. |
| inline int BytecodeArraySize(); |
| |
| inline int instruction_size(); |
| |
| // Returns the size of bytecode and its metadata. This includes the size of |
| // bytecode, constant pool, source position table, and handler table. |
| inline int SizeIncludingMetadata(); |
| |
| int SourcePosition(int offset); |
| int SourceStatementPosition(int offset); |
| |
| DECLARE_PRINTER(BytecodeArray) |
| DECLARE_VERIFIER(BytecodeArray) |
| |
| void Disassemble(std::ostream& os); |
| |
| void CopyBytecodesTo(BytecodeArray* to); |
| |
| int LookupRangeInHandlerTable(int code_offset, int* data, |
| HandlerTable::CatchPrediction* prediction); |
| |
| // Layout description. |
| static const int kConstantPoolOffset = FixedArrayBase::kHeaderSize; |
| static const int kHandlerTableOffset = kConstantPoolOffset + kPointerSize; |
| static const int kSourcePositionTableOffset = |
| kHandlerTableOffset + kPointerSize; |
| static const int kFrameSizeOffset = kSourcePositionTableOffset + kPointerSize; |
| static const int kParameterSizeOffset = kFrameSizeOffset + kIntSize; |
| static const int kInterruptBudgetOffset = kParameterSizeOffset + kIntSize; |
| static const int kOSRNestingLevelOffset = kInterruptBudgetOffset + kIntSize; |
| static const int kHeaderSize = kOSRNestingLevelOffset + kCharSize; |
| |
| // Maximal memory consumption for a single BytecodeArray. |
| static const int kMaxSize = 512 * MB; |
| // Maximal length of a single BytecodeArray. |
| static const int kMaxLength = kMaxSize - kHeaderSize; |
| |
| class BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArray); |
| }; |
| |
| |
| // FreeSpace are fixed-size free memory blocks used by the heap and GC. |
| // They look like heap objects (are heap object tagged and have a map) so that |
| // the heap remains iterable. They have a size and a next pointer. |
| // The next pointer is the raw address of the next FreeSpace object (or NULL) |
| // in the free list. |
| class FreeSpace: public HeapObject { |
| public: |
| // [size]: size of the free space including the header. |
| inline int size() const; |
| inline void set_size(int value); |
| |
| inline int nobarrier_size() const; |
| inline void nobarrier_set_size(int value); |
| |
| inline int Size(); |
| |
| // Accessors for the next field. |
| inline FreeSpace* next(); |
| inline void set_next(FreeSpace* next); |
| |
| inline static FreeSpace* cast(HeapObject* obj); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(FreeSpace) |
| DECLARE_VERIFIER(FreeSpace) |
| |
| // Layout description. |
| // Size is smi tagged when it is stored. |
| static const int kSizeOffset = HeapObject::kHeaderSize; |
| static const int kNextOffset = POINTER_SIZE_ALIGN(kSizeOffset + kPointerSize); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FreeSpace); |
| }; |
| |
| |
| // V has parameters (Type, type, TYPE, C type, element_size) |
| #define TYPED_ARRAYS(V) \ |
| V(Uint8, uint8, UINT8, uint8_t, 1) \ |
| V(Int8, int8, INT8, int8_t, 1) \ |
| V(Uint16, uint16, UINT16, uint16_t, 2) \ |
| V(Int16, int16, INT16, int16_t, 2) \ |
| V(Uint32, uint32, UINT32, uint32_t, 4) \ |
| V(Int32, int32, INT32, int32_t, 4) \ |
| V(Float32, float32, FLOAT32, float, 4) \ |
| V(Float64, float64, FLOAT64, double, 8) \ |
| V(Uint8Clamped, uint8_clamped, UINT8_CLAMPED, uint8_t, 1) |
| |
| |
| class FixedTypedArrayBase: public FixedArrayBase { |
| public: |
| // [base_pointer]: Either points to the FixedTypedArrayBase itself or nullptr. |
| DECL_ACCESSORS(base_pointer, Object) |
| |
| // [external_pointer]: Contains the offset between base_pointer and the start |
| // of the data. If the base_pointer is a nullptr, the external_pointer |
| // therefore points to the actual backing store. |
| DECL_ACCESSORS(external_pointer, void) |
| |
| // Dispatched behavior. |
| DECLARE_CAST(FixedTypedArrayBase) |
| |
| static const int kBasePointerOffset = FixedArrayBase::kHeaderSize; |
| static const int kExternalPointerOffset = kBasePointerOffset + kPointerSize; |
| static const int kHeaderSize = |
| DOUBLE_POINTER_ALIGN(kExternalPointerOffset + kPointerSize); |
| |
| static const int kDataOffset = kHeaderSize; |
| |
| class BodyDescriptor; |
| |
| inline int size(); |
| |
| static inline int TypedArraySize(InstanceType type, int length); |
| inline int TypedArraySize(InstanceType type); |
| |
| // Use with care: returns raw pointer into heap. |
| inline void* DataPtr(); |
| |
| inline int DataSize(); |
| |
| private: |
| static inline int ElementSize(InstanceType type); |
| |
| inline int DataSize(InstanceType type); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedTypedArrayBase); |
| }; |
| |
| |
| template <class Traits> |
| class FixedTypedArray: public FixedTypedArrayBase { |
| public: |
| typedef typename Traits::ElementType ElementType; |
| static const InstanceType kInstanceType = Traits::kInstanceType; |
| |
| DECLARE_CAST(FixedTypedArray<Traits>) |
| |
| inline ElementType get_scalar(int index); |
| static inline Handle<Object> get(FixedTypedArray* array, int index); |
| inline void set(int index, ElementType value); |
| |
| static inline ElementType from_int(int value); |
| static inline ElementType from_double(double value); |
| |
| // This accessor applies the correct conversion from Smi, HeapNumber |
| // and undefined. |
| inline void SetValue(uint32_t index, Object* value); |
| |
| DECLARE_PRINTER(FixedTypedArray) |
| DECLARE_VERIFIER(FixedTypedArray) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FixedTypedArray); |
| }; |
| |
| #define FIXED_TYPED_ARRAY_TRAITS(Type, type, TYPE, elementType, size) \ |
| class Type##ArrayTraits { \ |
| public: /* NOLINT */ \ |
| typedef elementType ElementType; \ |
| static const InstanceType kInstanceType = FIXED_##TYPE##_ARRAY_TYPE; \ |
| static const char* Designator() { return #type " array"; } \ |
| static inline Handle<Object> ToHandle(Isolate* isolate, \ |
| elementType scalar); \ |
| static inline elementType defaultValue(); \ |
| }; \ |
| \ |
| typedef FixedTypedArray<Type##ArrayTraits> Fixed##Type##Array; |
| |
| TYPED_ARRAYS(FIXED_TYPED_ARRAY_TRAITS) |
| |
| #undef FIXED_TYPED_ARRAY_TRAITS |
| |
| |
| // DeoptimizationInputData is a fixed array used to hold the deoptimization |
| // data for code generated by the Hydrogen/Lithium compiler. It also |
| // contains information about functions that were inlined. If N different |
| // functions were inlined then first N elements of the literal array will |
| // contain these functions. |
| // |
| // It can be empty. |
| class DeoptimizationInputData: public FixedArray { |
| public: |
| // Layout description. Indices in the array. |
| static const int kTranslationByteArrayIndex = 0; |
| static const int kInlinedFunctionCountIndex = 1; |
| static const int kLiteralArrayIndex = 2; |
| static const int kOsrAstIdIndex = 3; |
| static const int kOsrPcOffsetIndex = 4; |
| static const int kOptimizationIdIndex = 5; |
| static const int kSharedFunctionInfoIndex = 6; |
| static const int kWeakCellCacheIndex = 7; |
| static const int kFirstDeoptEntryIndex = 8; |
| |
| // Offsets of deopt entry elements relative to the start of the entry. |
| static const int kAstIdRawOffset = 0; |
| static const int kTranslationIndexOffset = 1; |
| static const int kArgumentsStackHeightOffset = 2; |
| static const int kPcOffset = 3; |
| static const int kDeoptEntrySize = 4; |
| |
| // Simple element accessors. |
| #define DECLARE_ELEMENT_ACCESSORS(name, type) \ |
| inline type* name(); \ |
| inline void Set##name(type* value); |
| |
| DECLARE_ELEMENT_ACCESSORS(TranslationByteArray, ByteArray) |
| DECLARE_ELEMENT_ACCESSORS(InlinedFunctionCount, Smi) |
| DECLARE_ELEMENT_ACCESSORS(LiteralArray, FixedArray) |
| DECLARE_ELEMENT_ACCESSORS(OsrAstId, Smi) |
| DECLARE_ELEMENT_ACCESSORS(OsrPcOffset, Smi) |
| DECLARE_ELEMENT_ACCESSORS(OptimizationId, Smi) |
| DECLARE_ELEMENT_ACCESSORS(SharedFunctionInfo, Object) |
| DECLARE_ELEMENT_ACCESSORS(WeakCellCache, Object) |
| |
| #undef DECLARE_ELEMENT_ACCESSORS |
| |
| // Accessors for elements of the ith deoptimization entry. |
| #define DECLARE_ENTRY_ACCESSORS(name, type) \ |
| inline type* name(int i); \ |
| inline void Set##name(int i, type* value); |
| |
| DECLARE_ENTRY_ACCESSORS(AstIdRaw, Smi) |
| DECLARE_ENTRY_ACCESSORS(TranslationIndex, Smi) |
| DECLARE_ENTRY_ACCESSORS(ArgumentsStackHeight, Smi) |
| DECLARE_ENTRY_ACCESSORS(Pc, Smi) |
| |
| #undef DECLARE_ENTRY_ACCESSORS |
| |
| inline BailoutId AstId(int i); |
| |
| inline void SetAstId(int i, BailoutId value); |
| |
| inline int DeoptCount(); |
| |
| // Allocates a DeoptimizationInputData. |
| static Handle<DeoptimizationInputData> New(Isolate* isolate, |
| int deopt_entry_count, |
| PretenureFlag pretenure); |
| |
| DECLARE_CAST(DeoptimizationInputData) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void DeoptimizationInputDataPrint(std::ostream& os); // NOLINT |
| #endif |
| |
| private: |
| static int IndexForEntry(int i) { |
| return kFirstDeoptEntryIndex + (i * kDeoptEntrySize); |
| } |
| |
| |
| static int LengthFor(int entry_count) { return IndexForEntry(entry_count); } |
| }; |
| |
| |
| // DeoptimizationOutputData is a fixed array used to hold the deoptimization |
| // data for code generated by the full compiler. |
| // The format of the these objects is |
| // [i * 2]: Ast ID for ith deoptimization. |
| // [i * 2 + 1]: PC and state of ith deoptimization |
| class DeoptimizationOutputData: public FixedArray { |
| public: |
| inline int DeoptPoints(); |
| |
| inline BailoutId AstId(int index); |
| |
| inline void SetAstId(int index, BailoutId id); |
| |
| inline Smi* PcAndState(int index); |
| inline void SetPcAndState(int index, Smi* offset); |
| |
| static int LengthOfFixedArray(int deopt_points) { |
| return deopt_points * 2; |
| } |
| |
| // Allocates a DeoptimizationOutputData. |
| static Handle<DeoptimizationOutputData> New(Isolate* isolate, |
| int number_of_deopt_points, |
| PretenureFlag pretenure); |
| |
| DECLARE_CAST(DeoptimizationOutputData) |
| |
| #ifdef ENABLE_DISASSEMBLER |
| void DeoptimizationOutputDataPrint(std::ostream& os); // NOLINT |
| #endif |
| }; |
| |
| |
| // A literals array contains the literals for a JSFunction. It also holds |
| // the type feedback vector. |
| class LiteralsArray : public FixedArray { |
| public: |
| static const int kVectorIndex = 0; |
| static const int kFirstLiteralIndex = 1; |
| static const int kFeedbackVectorOffset; |
| static const int kOffsetToFirstLiteral; |
| |
| static int OffsetOfLiteralAt(int index) { |
| return OffsetOfElementAt(index + kFirstLiteralIndex); |
| } |
| |
| inline TypeFeedbackVector* feedback_vector() const; |
| inline void set_feedback_vector(TypeFeedbackVector* vector); |
| inline Object* literal(int literal_index) const; |
| inline void set_literal(int literal_index, Object* literal); |
| inline void set_literal_undefined(int literal_index); |
| inline int literals_count() const; |
| |
| static Handle<LiteralsArray> New(Isolate* isolate, |
| Handle<TypeFeedbackVector> vector, |
| int number_of_literals, |
| PretenureFlag pretenure = TENURED); |
| |
| DECLARE_CAST(LiteralsArray) |
| |
| private: |
| inline Object* get(int index) const; |
| inline void set(int index, Object* value); |
| inline void set(int index, Smi* value); |
| inline void set(int index, Object* value, WriteBarrierMode mode); |
| }; |
| |
| |
| class TemplateList : public FixedArray { |
| public: |
| static Handle<TemplateList> New(Isolate* isolate, int size); |
| inline int length() const; |
| inline Object* get(int index) const; |
| inline void set(int index, Object* value); |
| static Handle<TemplateList> Add(Isolate* isolate, Handle<TemplateList> list, |
| Handle<Object> value); |
| DECLARE_CAST(TemplateList) |
| private: |
| static const int kLengthIndex = 0; |
| static const int kFirstElementIndex = kLengthIndex + 1; |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TemplateList); |
| }; |
| |
| // Code describes objects with on-the-fly generated machine code. |
| class Code: public HeapObject { |
| public: |
| // Opaque data type for encapsulating code flags like kind, inline |
| // cache state, and arguments count. |
| typedef uint32_t Flags; |
| |
| #define NON_IC_KIND_LIST(V) \ |
| V(FUNCTION) \ |
| V(OPTIMIZED_FUNCTION) \ |
| V(BYTECODE_HANDLER) \ |
| V(STUB) \ |
| V(HANDLER) \ |
| V(BUILTIN) \ |
| V(REGEXP) \ |
| V(WASM_FUNCTION) \ |
| V(WASM_TO_JS_FUNCTION) \ |
| V(JS_TO_WASM_FUNCTION) |
| |
| #define IC_KIND_LIST(V) \ |
| V(LOAD_IC) \ |
| V(LOAD_GLOBAL_IC) \ |
| V(KEYED_LOAD_IC) \ |
| V(CALL_IC) \ |
| V(STORE_IC) \ |
| V(KEYED_STORE_IC) \ |
| V(BINARY_OP_IC) \ |
| V(COMPARE_IC) \ |
| V(TO_BOOLEAN_IC) |
| |
| #define CODE_KIND_LIST(V) \ |
| NON_IC_KIND_LIST(V) \ |
| IC_KIND_LIST(V) |
| |
| enum Kind { |
| #define DEFINE_CODE_KIND_ENUM(name) name, |
| CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM) |
| #undef DEFINE_CODE_KIND_ENUM |
| NUMBER_OF_KINDS |
| }; |
| |
| static const char* Kind2String(Kind kind); |
| |
| static const int kPrologueOffsetNotSet = -1; |
| |
| #ifdef ENABLE_DISASSEMBLER |
| // Printing |
| static const char* ICState2String(InlineCacheState state); |
| static void PrintExtraICState(std::ostream& os, // NOLINT |
| Kind kind, ExtraICState extra); |
| void Disassemble(const char* name, std::ostream& os); // NOLINT |
| #endif // ENABLE_DISASSEMBLER |
| |
| // [instruction_size]: Size of the native instructions |
| inline int instruction_size() const; |
| inline void set_instruction_size(int value); |
| |
| // [relocation_info]: Code relocation information |
| DECL_ACCESSORS(relocation_info, ByteArray) |
| void InvalidateRelocation(); |
| void InvalidateEmbeddedObjects(); |
| |
| // [handler_table]: Fixed array containing offsets of exception handlers. |
| DECL_ACCESSORS(handler_table, FixedArray) |
| |
| // [deoptimization_data]: Array containing data for deopt. |
| DECL_ACCESSORS(deoptimization_data, FixedArray) |
| |
| // [source_position_table]: ByteArray for the source positions table. |
| DECL_ACCESSORS(source_position_table, ByteArray) |
| |
| // [raw_type_feedback_info]: This field stores various things, depending on |
| // the kind of the code object. |
| // FUNCTION => type feedback information. |
| // STUB and ICs => major/minor key as Smi. |
| DECL_ACCESSORS(raw_type_feedback_info, Object) |
| inline Object* type_feedback_info(); |
| inline void set_type_feedback_info( |
| Object* value, WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| inline uint32_t stub_key(); |
| inline void set_stub_key(uint32_t key); |
| |
| // [next_code_link]: Link for lists of optimized or deoptimized code. |
| // Note that storage for this field is overlapped with typefeedback_info. |
| DECL_ACCESSORS(next_code_link, Object) |
| |
| // [gc_metadata]: Field used to hold GC related metadata. The contents of this |
| // field does not have to be traced during garbage collection since |
| // it is only used by the garbage collector itself. |
| DECL_ACCESSORS(gc_metadata, Object) |
| |
| // [ic_age]: Inline caching age: the value of the Heap::global_ic_age |
| // at the moment when this object was created. |
| inline void set_ic_age(int count); |
| inline int ic_age() const; |
| |
| // [prologue_offset]: Offset of the function prologue, used for aging |
| // FUNCTIONs and OPTIMIZED_FUNCTIONs. |
| inline int prologue_offset() const; |
| inline void set_prologue_offset(int offset); |
| |
| // [constant_pool offset]: Offset of the constant pool. |
| // Valid for FLAG_enable_embedded_constant_pool only |
| inline int constant_pool_offset() const; |
| inline void set_constant_pool_offset(int offset); |
| |
| // Unchecked accessors to be used during GC. |
| inline ByteArray* unchecked_relocation_info(); |
| |
| inline int relocation_size(); |
| |
| // [flags]: Various code flags. |
| inline Flags flags(); |
| inline void set_flags(Flags flags); |
| |
| // [flags]: Access to specific code flags. |
| inline Kind kind(); |
| inline ExtraICState extra_ic_state(); // Only valid for IC stubs. |
| |
| // Testers for IC stub kinds. |
| inline bool is_inline_cache_stub(); |
| inline bool is_debug_stub(); |
| inline bool is_handler(); |
| inline bool is_call_stub(); |
| inline bool is_binary_op_stub(); |
| inline bool is_compare_ic_stub(); |
| inline bool is_to_boolean_ic_stub(); |
| inline bool is_optimized_code(); |
| inline bool is_wasm_code(); |
| |
| inline bool IsCodeStubOrIC(); |
| |
| inline void set_raw_kind_specific_flags1(int value); |
| inline void set_raw_kind_specific_flags2(int value); |
| |
| // Testers for interpreter builtins. |
| inline bool is_interpreter_trampoline_builtin(); |
| |
| // [is_crankshafted]: For kind STUB or ICs, tells whether or not a code |
| // object was generated by either the hydrogen or the TurboFan optimizing |
| // compiler (but it may not be an optimized function). |
| inline bool is_crankshafted(); |
| inline bool is_hydrogen_stub(); // Crankshafted, but not a function. |
| inline void set_is_crankshafted(bool value); |
| |
| // [is_turbofanned]: For kind STUB or OPTIMIZED_FUNCTION, tells whether the |
| // code object was generated by the TurboFan optimizing compiler. |
| inline bool is_turbofanned(); |
| inline void set_is_turbofanned(bool value); |
| |
| // [can_have_weak_objects]: For kind OPTIMIZED_FUNCTION, tells whether the |
| // embedded objects in code should be treated weakly. |
| inline bool can_have_weak_objects(); |
| inline void set_can_have_weak_objects(bool value); |
| |
| // [is_construct_stub]: For kind BUILTIN, tells whether the code object |
| // represents a hand-written construct stub |
| // (e.g., NumberConstructor_ConstructStub). |
| inline bool is_construct_stub(); |
| inline void set_is_construct_stub(bool value); |
| |
| // [has_deoptimization_support]: For FUNCTION kind, tells if it has |
| // deoptimization support. |
| inline bool has_deoptimization_support(); |
| inline void set_has_deoptimization_support(bool value); |
| |
| // [has_debug_break_slots]: For FUNCTION kind, tells if it has |
| // been compiled with debug break slots. |
| inline bool has_debug_break_slots(); |
| inline void set_has_debug_break_slots(bool value); |
| |
| // [has_reloc_info_for_serialization]: For FUNCTION kind, tells if its |
| // reloc info includes runtime and external references to support |
| // serialization/deserialization. |
| inline bool has_reloc_info_for_serialization(); |
| inline void set_has_reloc_info_for_serialization(bool value); |
| |
| // [allow_osr_at_loop_nesting_level]: For FUNCTION kind, tells for |
| // how long the function has been marked for OSR and therefore which |
| // level of loop nesting we are willing to do on-stack replacement |
| // for. |
| inline void set_allow_osr_at_loop_nesting_level(int level); |
| inline int allow_osr_at_loop_nesting_level(); |
| |
| // [profiler_ticks]: For FUNCTION kind, tells for how many profiler ticks |
| // the code object was seen on the stack with no IC patching going on. |
| inline int profiler_ticks(); |
| inline void set_profiler_ticks(int ticks); |
| |
| // [builtin_index]: For builtins, tells which builtin index the code object |
| // has. Note that builtins can have a code kind other than BUILTIN. The |
| // builtin index is a non-negative integer for builtins, and -1 otherwise. |
| inline int builtin_index(); |
| inline void set_builtin_index(int id); |
| |
| // [stack_slots]: For kind OPTIMIZED_FUNCTION, the number of stack slots |
| // reserved in the code prologue. |
| inline unsigned stack_slots(); |
| inline void set_stack_slots(unsigned slots); |
| |
| // [safepoint_table_start]: For kind OPTIMIZED_FUNCTION, the offset in |
| // the instruction stream where the safepoint table starts. |
| inline unsigned safepoint_table_offset(); |
| inline void set_safepoint_table_offset(unsigned offset); |
| |
| // [back_edge_table_start]: For kind FUNCTION, the offset in the |
| // instruction stream where the back edge table starts. |
| inline unsigned back_edge_table_offset(); |
| inline void set_back_edge_table_offset(unsigned offset); |
| |
| inline bool back_edges_patched_for_osr(); |
| |
| // [to_boolean_foo]: For kind TO_BOOLEAN_IC tells what state the stub is in. |
| inline uint16_t to_boolean_state(); |
| |
| // [marked_for_deoptimization]: For kind OPTIMIZED_FUNCTION tells whether |
| // the code is going to be deoptimized because of dead embedded maps. |
| inline bool marked_for_deoptimization(); |
| inline void set_marked_for_deoptimization(bool flag); |
| |
| // [constant_pool]: The constant pool for this function. |
| inline Address constant_pool(); |
| |
| // Get the safepoint entry for the given pc. |
| SafepointEntry GetSafepointEntry(Address pc); |
| |
| // Find an object in a stub with a specified map |
| Object* FindNthObject(int n, Map* match_map); |
| |
| // Find the first allocation site in an IC stub. |
| AllocationSite* FindFirstAllocationSite(); |
| |
| // Find the first map in an IC stub. |
| Map* FindFirstMap(); |
| |
| class FindAndReplacePattern; |
| // For each (map-to-find, object-to-replace) pair in the pattern, this |
| // function replaces the corresponding placeholder in the code with the |
| // object-to-replace. The function assumes that pairs in the pattern come in |
| // the same order as the placeholders in the code. |
| // If the placeholder is a weak cell, then the value of weak cell is matched |
| // against the map-to-find. |
| void FindAndReplace(const FindAndReplacePattern& pattern); |
| |
| // The entire code object including its header is copied verbatim to the |
| // snapshot so that it can be written in one, fast, memcpy during |
| // deserialization. The deserializer will overwrite some pointers, rather |
| // like a runtime linker, but the random allocation addresses used in the |
| // mksnapshot process would still be present in the unlinked snapshot data, |
| // which would make snapshot production non-reproducible. This method wipes |
| // out the to-be-overwritten header data for reproducible snapshots. |
| inline void WipeOutHeader(); |
| |
| // Flags operations. |
| static inline Flags ComputeFlags( |
| Kind kind, ExtraICState extra_ic_state = kNoExtraICState, |
| CacheHolderFlag holder = kCacheOnReceiver); |
| |
| static inline Flags ComputeHandlerFlags( |
| Kind handler_kind, CacheHolderFlag holder = kCacheOnReceiver); |
| |
| static inline CacheHolderFlag ExtractCacheHolderFromFlags(Flags flags); |
| static inline Kind ExtractKindFromFlags(Flags flags); |
| static inline ExtraICState ExtractExtraICStateFromFlags(Flags flags); |
| |
| static inline Flags RemoveHolderFromFlags(Flags flags); |
| |
| // Convert a target address into a code object. |
| static inline Code* GetCodeFromTargetAddress(Address address); |
| |
| // Convert an entry address into an object. |
| static inline Object* GetObjectFromEntryAddress(Address location_of_address); |
| |
| // Returns the address of the first instruction. |
| inline byte* instruction_start(); |
| |
| // Returns the address right after the last instruction. |
| inline byte* instruction_end(); |
| |
| // Returns the size of the instructions, padding, relocation and unwinding |
| // information. |
| inline int body_size(); |
| |
| // Returns the size of code and its metadata. This includes the size of code |
| // relocation information, deoptimization data and handler table. |
| inline int SizeIncludingMetadata(); |
| |
| // Returns the address of the first relocation info (read backwards!). |
| inline byte* relocation_start(); |
| |
| // [has_unwinding_info]: Whether this code object has unwinding information. |
| // If it doesn't, unwinding_information_start() will point to invalid data. |
| // |
| // The body of all code objects has the following layout. |
| // |
| // +--------------------------+ <-- instruction_start() |
| // | instructions | |
| // | ... | |
| // +--------------------------+ |
| // | relocation info | |
| // | ... | |
| // +--------------------------+ <-- instruction_end() |
| // |
| // If has_unwinding_info() is false, instruction_end() points to the first |
| // memory location after the end of the code object. Otherwise, the body |
| // continues as follows: |
| // |
| // +--------------------------+ |
| // | padding to the next | |
| // | 8-byte aligned address | |
| // +--------------------------+ <-- instruction_end() |
| // | [unwinding_info_size] | |
| // | as uint64_t | |
| // +--------------------------+ <-- unwinding_info_start() |
| // | unwinding info | |
| // | ... | |
| // +--------------------------+ <-- unwinding_info_end() |
| // |
| // and unwinding_info_end() points to the first memory location after the end |
| // of the code object. |
| // |
| DECL_BOOLEAN_ACCESSORS(has_unwinding_info) |
| |
| // [unwinding_info_size]: Size of the unwinding information. |
| inline int unwinding_info_size() const; |
| inline void set_unwinding_info_size(int value); |
| |
| // Returns the address of the unwinding information, if any. |
| inline byte* unwinding_info_start(); |
| |
| // Returns the address right after the end of the unwinding information. |
| inline byte* unwinding_info_end(); |
| |
| // Code entry point. |
| inline byte* entry(); |
| |
| // Returns true if pc is inside this object's instructions. |
| inline bool contains(byte* pc); |
| |
| // Relocate the code by delta bytes. Called to signal that this code |
| // object has been moved by delta bytes. |
| void Relocate(intptr_t delta); |
| |
| // Migrate code described by desc. |
| void CopyFrom(const CodeDesc& desc); |
| |
| // Returns the object size for a given body (used for allocation). |
| static int SizeFor(int body_size) { |
| DCHECK_SIZE_TAG_ALIGNED(body_size); |
| return RoundUp(kHeaderSize + body_size, kCodeAlignment); |
| } |
| |
| // Calculate the size of the code object to report for log events. This takes |
| // the layout of the code object into account. |
| inline int ExecutableSize(); |
| |
| DECLARE_CAST(Code) |
| |
| // Dispatched behavior. |
| inline int CodeSize(); |
| |
| DECLARE_PRINTER(Code) |
| DECLARE_VERIFIER(Code) |
| |
| void ClearInlineCaches(); |
| |
| BailoutId TranslatePcOffsetToAstId(uint32_t pc_offset); |
| uint32_t TranslateAstIdToPcOffset(BailoutId ast_id); |
| |
| int LookupRangeInHandlerTable(int code_offset, int* data, |
| HandlerTable::CatchPrediction* prediction); |
| |
| #define DECLARE_CODE_AGE_ENUM(X) k##X##CodeAge, |
| enum Age { |
| kToBeExecutedOnceCodeAge = -3, |
| kNotExecutedCodeAge = -2, |
| kExecutedOnceCodeAge = -1, |
| kNoAgeCodeAge = 0, |
| CODE_AGE_LIST(DECLARE_CODE_AGE_ENUM) |
| kAfterLastCodeAge, |
| kFirstCodeAge = kToBeExecutedOnceCodeAge, |
| kLastCodeAge = kAfterLastCodeAge - 1, |
| kCodeAgeCount = kAfterLastCodeAge - kFirstCodeAge - 1, |
| kIsOldCodeAge = kSexagenarianCodeAge, |
| kPreAgedCodeAge = kIsOldCodeAge - 1 |
| }; |
| #undef DECLARE_CODE_AGE_ENUM |
| |
| // Code aging. Indicates how many full GCs this code has survived without |
| // being entered through the prologue. Used to determine when it is |
| // relatively safe to flush this code object and replace it with the lazy |
| // compilation stub. |
| static void MakeCodeAgeSequenceYoung(byte* sequence, Isolate* isolate); |
| static void MarkCodeAsExecuted(byte* sequence, Isolate* isolate); |
| void MakeYoung(Isolate* isolate); |
| void PreAge(Isolate* isolate); |
| void MarkToBeExecutedOnce(Isolate* isolate); |
| void MakeOlder(MarkingParity); |
| static bool IsYoungSequence(Isolate* isolate, byte* sequence); |
| bool IsOld(); |
| Age GetAge(); |
| static inline Code* GetPreAgedCodeAgeStub(Isolate* isolate) { |
| return GetCodeAgeStub(isolate, kNotExecutedCodeAge, NO_MARKING_PARITY); |
| } |
| |
| void PrintDeoptLocation(FILE* out, Address pc); |
| bool CanDeoptAt(Address pc); |
| |
| #ifdef VERIFY_HEAP |
| void VerifyEmbeddedObjectsDependency(); |
| #endif |
| |
| #ifdef DEBUG |
| enum VerifyMode { kNoContextSpecificPointers, kNoContextRetainingPointers }; |
| void VerifyEmbeddedObjects(VerifyMode mode = kNoContextRetainingPointers); |
| static void VerifyRecompiledCode(Code* old_code, Code* new_code); |
| #endif // DEBUG |
| |
| inline bool CanContainWeakObjects(); |
| |
| inline bool IsWeakObject(Object* object); |
| |
| static inline bool IsWeakObjectInOptimizedCode(Object* object); |
| |
| static Handle<WeakCell> WeakCellFor(Handle<Code> code); |
| WeakCell* CachedWeakCell(); |
| |
| static const int kConstantPoolSize = |
| FLAG_enable_embedded_constant_pool ? kIntSize : 0; |
| |
| // Layout description. |
| static const int kRelocationInfoOffset = HeapObject::kHeaderSize; |
| static const int kHandlerTableOffset = kRelocationInfoOffset + kPointerSize; |
| static const int kDeoptimizationDataOffset = |
| kHandlerTableOffset + kPointerSize; |
| static const int kSourcePositionTableOffset = |
| kDeoptimizationDataOffset + kPointerSize; |
| // For FUNCTION kind, we store the type feedback info here. |
| static const int kTypeFeedbackInfoOffset = |
| kSourcePositionTableOffset + kPointerSize; |
| static const int kNextCodeLinkOffset = kTypeFeedbackInfoOffset + kPointerSize; |
| static const int kGCMetadataOffset = kNextCodeLinkOffset + kPointerSize; |
| static const int kInstructionSizeOffset = kGCMetadataOffset + kPointerSize; |
| static const int kICAgeOffset = kInstructionSizeOffset + kIntSize; |
| static const int kFlagsOffset = kICAgeOffset + kIntSize; |
| static const int kKindSpecificFlags1Offset = kFlagsOffset + kIntSize; |
| static const int kKindSpecificFlags2Offset = |
| kKindSpecificFlags1Offset + kIntSize; |
| // Note: We might be able to squeeze this into the flags above. |
| static const int kPrologueOffset = kKindSpecificFlags2Offset + kIntSize; |
| static const int kConstantPoolOffset = kPrologueOffset + kIntSize; |
| static const int kBuiltinIndexOffset = |
| kConstantPoolOffset + kConstantPoolSize; |
| static const int kHeaderPaddingStart = kBuiltinIndexOffset + kIntSize; |
| |
| // Add padding to align the instruction start following right after |
| // the Code object header. |
| static const int kHeaderSize = |
| (kHeaderPaddingStart + kCodeAlignmentMask) & ~kCodeAlignmentMask; |
| |
| inline int GetUnwindingInfoSizeOffset() const; |
| |
| class BodyDescriptor; |
| |
| // Byte offsets within kKindSpecificFlags1Offset. |
| static const int kFullCodeFlags = kKindSpecificFlags1Offset; |
| class FullCodeFlagsHasDeoptimizationSupportField: |
| public BitField<bool, 0, 1> {}; // NOLINT |
| class FullCodeFlagsHasDebugBreakSlotsField: public BitField<bool, 1, 1> {}; |
| class FullCodeFlagsHasRelocInfoForSerialization |
| : public BitField<bool, 2, 1> {}; |
| // Bit 3 in this bitfield is unused. |
| class ProfilerTicksField : public BitField<int, 4, 28> {}; |
| |
| // Flags layout. BitField<type, shift, size>. |
| class HasUnwindingInfoField : public BitField<bool, 0, 1> {}; |
| class CacheHolderField |
| : public BitField<CacheHolderFlag, HasUnwindingInfoField::kNext, 2> {}; |
| class KindField : public BitField<Kind, CacheHolderField::kNext, 5> {}; |
| STATIC_ASSERT(NUMBER_OF_KINDS <= KindField::kMax); |
| class ExtraICStateField |
| : public BitField<ExtraICState, KindField::kNext, |
| PlatformSmiTagging::kSmiValueSize - KindField::kNext> { |
| }; |
| |
| // KindSpecificFlags1 layout (STUB, BUILTIN and OPTIMIZED_FUNCTION) |
| static const int kStackSlotsFirstBit = 0; |
| static const int kStackSlotsBitCount = 24; |
| static const int kMarkedForDeoptimizationBit = |
| kStackSlotsFirstBit + kStackSlotsBitCount; |
| static const int kIsTurbofannedBit = kMarkedForDeoptimizationBit + 1; |
| static const int kCanHaveWeakObjects = kIsTurbofannedBit + 1; |
| // Could be moved to overlap previous bits when we need more space. |
| static const int kIsConstructStub = kCanHaveWeakObjects + 1; |
| |
| STATIC_ASSERT(kStackSlotsFirstBit + kStackSlotsBitCount <= 32); |
| STATIC_ASSERT(kIsConstructStub + 1 <= 32); |
| |
| class StackSlotsField: public BitField<int, |
| kStackSlotsFirstBit, kStackSlotsBitCount> {}; // NOLINT |
| class MarkedForDeoptimizationField |
| : public BitField<bool, kMarkedForDeoptimizationBit, 1> {}; // NOLINT |
| class IsTurbofannedField : public BitField<bool, kIsTurbofannedBit, 1> { |
| }; // NOLINT |
| class CanHaveWeakObjectsField |
| : public BitField<bool, kCanHaveWeakObjects, 1> {}; // NOLINT |
| class IsConstructStubField : public BitField<bool, kIsConstructStub, 1> { |
| }; // NOLINT |
| |
| // KindSpecificFlags2 layout (ALL) |
| static const int kIsCrankshaftedBit = 0; |
| class IsCrankshaftedField: public BitField<bool, |
| kIsCrankshaftedBit, 1> {}; // NOLINT |
| |
| // KindSpecificFlags2 layout (STUB and OPTIMIZED_FUNCTION) |
| static const int kSafepointTableOffsetFirstBit = kIsCrankshaftedBit + 1; |
| static const int kSafepointTableOffsetBitCount = 30; |
| |
| STATIC_ASSERT(kSafepointTableOffsetFirstBit + |
| kSafepointTableOffsetBitCount <= 32); |
| STATIC_ASSERT(1 + kSafepointTableOffsetBitCount <= 32); |
| |
| class SafepointTableOffsetField: public BitField<int, |
| kSafepointTableOffsetFirstBit, |
| kSafepointTableOffsetBitCount> {}; // NOLINT |
| |
| // KindSpecificFlags2 layout (FUNCTION) |
| class BackEdgeTableOffsetField: public BitField<int, |
| kIsCrankshaftedBit + 1, 27> {}; // NOLINT |
| class AllowOSRAtLoopNestingLevelField: public BitField<int, |
| kIsCrankshaftedBit + 1 + 27, 4> {}; // NOLINT |
| |
| static const int kArgumentsBits = 16; |
| static const int kMaxArguments = (1 << kArgumentsBits) - 1; |
| |
| // This constant should be encodable in an ARM instruction. |
| static const int kFlagsNotUsedInLookup = CacheHolderField::kMask; |
| |
| private: |
| friend class RelocIterator; |
| friend class Deoptimizer; // For FindCodeAgeSequence. |
| |
| // Code aging |
| byte* FindCodeAgeSequence(); |
| static void GetCodeAgeAndParity(Code* code, Age* age, |
| MarkingParity* parity); |
| static void GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age, |
| MarkingParity* parity); |
| static Code* GetCodeAgeStub(Isolate* isolate, Age age, MarkingParity parity); |
| |
| // Code aging -- platform-specific |
| static void PatchPlatformCodeAge(Isolate* isolate, |
| byte* sequence, Age age, |
| MarkingParity parity); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Code); |
| }; |
| |
| class AbstractCode : public HeapObject { |
| public: |
| // All code kinds and INTERPRETED_FUNCTION. |
| enum Kind { |
| #define DEFINE_CODE_KIND_ENUM(name) name, |
| CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM) |
| #undef DEFINE_CODE_KIND_ENUM |
| INTERPRETED_FUNCTION, |
| NUMBER_OF_KINDS |
| }; |
| |
| static const char* Kind2String(Kind kind); |
| |
| int SourcePosition(int offset); |
| int SourceStatementPosition(int offset); |
| |
| // Returns the address of the first instruction. |
| inline Address instruction_start(); |
| |
| // Returns the address right after the last instruction. |
| inline Address instruction_end(); |
| |
| // Returns the size of the code instructions. |
| inline int instruction_size(); |
| |
| // Return the source position table. |
| inline ByteArray* source_position_table(); |
| |
| // Set the source position table. |
| inline void set_source_position_table(ByteArray* source_position_table); |
| |
| // Return the exception handler table. |
| inline int LookupRangeInHandlerTable( |
| int code_offset, int* data, HandlerTable::CatchPrediction* prediction); |
| |
| // Returns the size of instructions and the metadata. |
| inline int SizeIncludingMetadata(); |
| |
| // Returns true if pc is inside this object's instructions. |
| inline bool contains(byte* pc); |
| |
| // Returns the AbstractCode::Kind of the code. |
| inline Kind kind(); |
| |
| // Calculate the size of the code object to report for log events. This takes |
| // the layout of the code object into account. |
| inline int ExecutableSize(); |
| |
| DECLARE_CAST(AbstractCode) |
| inline Code* GetCode(); |
| inline BytecodeArray* GetBytecodeArray(); |
| |
| // Max loop nesting marker used to postpose OSR. We don't take loop |
| // nesting that is deeper than 5 levels into account. |
| static const int kMaxLoopNestingMarker = 6; |
| STATIC_ASSERT(Code::AllowOSRAtLoopNestingLevelField::kMax >= |
| kMaxLoopNestingMarker); |
| }; |
| |
| // Dependent code is a singly linked list of fixed arrays. Each array contains |
| // code objects in weak cells for one dependent group. The suffix of the array |
| // can be filled with the undefined value if the number of codes is less than |
| // the length of the array. |
| // |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | next | count & group 1 | code 1 | code 2 | ... | code n | undefined | ... | |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | |
| // V |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | next | count & group 2 | code 1 | code 2 | ... | code m | undefined | ... | |
| // +------+-----------------+--------+--------+-----+--------+-----------+-----+ |
| // | |
| // V |
| // empty_fixed_array() |
| // |
| // The list of fixed arrays is ordered by dependency groups. |
| |
| class DependentCode: public FixedArray { |
| public: |
| enum DependencyGroup { |
| // Group of code that weakly embed this map and depend on being |
| // deoptimized when the map is garbage collected. |
| kWeakCodeGroup, |
| // Group of code that embed a transition to this map, and depend on being |
| // deoptimized when the transition is replaced by a new version. |
| kTransitionGroup, |
| // Group of code that omit run-time prototype checks for prototypes |
| // described by this map. The group is deoptimized whenever an object |
| // described by this map changes shape (and transitions to a new map), |
| // possibly invalidating the assumptions embedded in the code. |
| kPrototypeCheckGroup, |
| // Group of code that depends on global property values in property cells |
| // not being changed. |
| kPropertyCellChangedGroup, |
| // Group of code that omit run-time type checks for the field(s) introduced |
| // by this map. |
| kFieldTypeGroup, |
| // Group of code that omit run-time type checks for initial maps of |
| // constructors. |
| kInitialMapChangedGroup, |
| // Group of code that depends on tenuring information in AllocationSites |
| // not being changed. |
| kAllocationSiteTenuringChangedGroup, |
| // Group of code that depends on element transition information in |
| // AllocationSites not being changed. |
| kAllocationSiteTransitionChangedGroup |
| }; |
| |
| static const int kGroupCount = kAllocationSiteTransitionChangedGroup + 1; |
| static const int kNextLinkIndex = 0; |
| static const int kFlagsIndex = 1; |
| static const int kCodesStartIndex = 2; |
| |
| bool Contains(DependencyGroup group, WeakCell* code_cell); |
| bool IsEmpty(DependencyGroup group); |
| |
| static Handle<DependentCode> InsertCompilationDependencies( |
| Handle<DependentCode> entries, DependencyGroup group, |
| Handle<Foreign> info); |
| |
| static Handle<DependentCode> InsertWeakCode(Handle<DependentCode> entries, |
| DependencyGroup group, |
| Handle<WeakCell> code_cell); |
| |
| void UpdateToFinishedCode(DependencyGroup group, Foreign* info, |
| WeakCell* code_cell); |
| |
| void RemoveCompilationDependencies(DependentCode::DependencyGroup group, |
| Foreign* info); |
| |
| void DeoptimizeDependentCodeGroup(Isolate* isolate, |
| DependentCode::DependencyGroup group); |
| |
| bool MarkCodeForDeoptimization(Isolate* isolate, |
| DependentCode::DependencyGroup group); |
| |
| // The following low-level accessors should only be used by this class |
| // and the mark compact collector. |
| inline DependentCode* next_link(); |
| inline void set_next_link(DependentCode* next); |
| inline int count(); |
| inline void set_count(int value); |
| inline DependencyGroup group(); |
| inline void set_group(DependencyGroup group); |
| inline Object* object_at(int i); |
| inline void set_object_at(int i, Object* object); |
| inline void clear_at(int i); |
| inline void copy(int from, int to); |
| DECLARE_CAST(DependentCode) |
| |
| static const char* DependencyGroupName(DependencyGroup group); |
| static void SetMarkedForDeoptimization(Code* code, DependencyGroup group); |
| |
| private: |
| static Handle<DependentCode> Insert(Handle<DependentCode> entries, |
| DependencyGroup group, |
| Handle<Object> object); |
| static Handle<DependentCode> New(DependencyGroup group, Handle<Object> object, |
| Handle<DependentCode> next); |
| static Handle<DependentCode> EnsureSpace(Handle<DependentCode> entries); |
| // Compact by removing cleared weak cells and return true if there was |
| // any cleared weak cell. |
| bool Compact(); |
| static int Grow(int number_of_entries) { |
| if (number_of_entries < 5) return number_of_entries + 1; |
| return number_of_entries * 5 / 4; |
| } |
| inline int flags(); |
| inline void set_flags(int flags); |
| class GroupField : public BitField<int, 0, 3> {}; |
| class CountField : public BitField<int, 3, 27> {}; |
| STATIC_ASSERT(kGroupCount <= GroupField::kMax + 1); |
| }; |
| |
| |
| class PrototypeInfo; |
| |
| |
| // All heap objects have a Map that describes their structure. |
| // A Map contains information about: |
| // - Size information about the object |
| // - How to iterate over an object (for garbage collection) |
| class Map: public HeapObject { |
| public: |
| // Instance size. |
| // Size in bytes or kVariableSizeSentinel if instances do not have |
| // a fixed size. |
| inline int instance_size(); |
| inline void set_instance_size(int value); |
| |
| // Only to clear an unused byte, remove once byte is used. |
| inline void clear_unused(); |
| |
| // [inobject_properties_or_constructor_function_index]: Provides access |
| // to the inobject properties in case of JSObject maps, or the constructor |
| // function index in case of primitive maps. |
| inline int inobject_properties_or_constructor_function_index(); |
| inline void set_inobject_properties_or_constructor_function_index(int value); |
| // Count of properties allocated in the object (JSObject only). |
| inline int GetInObjectProperties(); |
| inline void SetInObjectProperties(int value); |
| // Index of the constructor function in the native context (primitives only), |
| // or the special sentinel value to indicate that there is no object wrapper |
| // for the primitive (i.e. in case of null or undefined). |
| static const int kNoConstructorFunctionIndex = 0; |
| inline int GetConstructorFunctionIndex(); |
| inline void SetConstructorFunctionIndex(int value); |
| static MaybeHandle<JSFunction> GetConstructorFunction( |
| Handle<Map> map, Handle<Context> native_context); |
| |
| // Retrieve interceptors. |
| inline InterceptorInfo* GetNamedInterceptor(); |
| inline InterceptorInfo* GetIndexedInterceptor(); |
| |
| // Instance type. |
| inline InstanceType instance_type(); |
| inline void set_instance_type(InstanceType value); |
| |
| // Tells how many unused property fields are available in the |
| // instance (only used for JSObject in fast mode). |
| inline int unused_property_fields(); |
| inline void set_unused_property_fields(int value); |
| |
| // Bit field. |
| inline byte bit_field() const; |
| inline void set_bit_field(byte value); |
| |
| // Bit field 2. |
| inline byte bit_field2() const; |
| inline void set_bit_field2(byte value); |
| |
| // Bit field 3. |
| inline uint32_t bit_field3() const; |
| inline void set_bit_field3(uint32_t bits); |
| |
| class EnumLengthBits: public BitField<int, |
| 0, kDescriptorIndexBitCount> {}; // NOLINT |
| class NumberOfOwnDescriptorsBits: public BitField<int, |
| kDescriptorIndexBitCount, kDescriptorIndexBitCount> {}; // NOLINT |
| STATIC_ASSERT(kDescriptorIndexBitCount + kDescriptorIndexBitCount == 20); |
| class DictionaryMap : public BitField<bool, 20, 1> {}; |
| class OwnsDescriptors : public BitField<bool, 21, 1> {}; |
| class HasHiddenPrototype : public BitField<bool, 22, 1> {}; |
| class Deprecated : public BitField<bool, 23, 1> {}; |
| class IsUnstable : public BitField<bool, 24, 1> {}; |
| class IsMigrationTarget : public BitField<bool, 25, 1> {}; |
| class ImmutablePrototype : public BitField<bool, 26, 1> {}; |
| class NewTargetIsBase : public BitField<bool, 27, 1> {}; |
| // Bit 28 is free. |
| |
| // Keep this bit field at the very end for better code in |
| // Builtins::kJSConstructStubGeneric stub. |
| // This counter is used for in-object slack tracking. |
| // The in-object slack tracking is considered enabled when the counter is |
| // non zero. The counter only has a valid count for initial maps. For |
| // transitioned maps only kNoSlackTracking has a meaning, namely that inobject |
| // slack tracking already finished for the transition tree. Any other value |
| // indicates that either inobject slack tracking is still in progress, or that |
| // the map isn't part of the transition tree anymore. |
| class ConstructionCounter : public BitField<int, 29, 3> {}; |
| static const int kSlackTrackingCounterStart = 7; |
| static const int kSlackTrackingCounterEnd = 1; |
| static const int kNoSlackTracking = 0; |
| STATIC_ASSERT(kSlackTrackingCounterStart <= ConstructionCounter::kMax); |
| |
| |
| // Inobject slack tracking is the way to reclaim unused inobject space. |
| // |
| // The instance size is initially determined by adding some slack to |
| // expected_nof_properties (to allow for a few extra properties added |
| // after the constructor). There is no guarantee that the extra space |
| // will not be wasted. |
| // |
| // Here is the algorithm to reclaim the unused inobject space: |
| // - Detect the first constructor call for this JSFunction. |
| // When it happens enter the "in progress" state: initialize construction |
| // counter in the initial_map. |
| // - While the tracking is in progress initialize unused properties of a new |
| // object with one_pointer_filler_map instead of undefined_value (the "used" |
| // part is initialized with undefined_value as usual). This way they can |
| // be resized quickly and safely. |
| // - Once enough objects have been created compute the 'slack' |
| // (traverse the map transition tree starting from the |
| // initial_map and find the lowest value of unused_property_fields). |
| // - Traverse the transition tree again and decrease the instance size |
| // of every map. Existing objects will resize automatically (they are |
| // filled with one_pointer_filler_map). All further allocations will |
| // use the adjusted instance size. |
| // - SharedFunctionInfo's expected_nof_properties left unmodified since |
| // allocations made using different closures could actually create different |
| // kind of objects (see prototype inheritance pattern). |
| // |
| // Important: inobject slack tracking is not attempted during the snapshot |
| // creation. |
| |
| static const int kGenerousAllocationCount = |
| kSlackTrackingCounterStart - kSlackTrackingCounterEnd + 1; |
| |
| // Starts the tracking by initializing object constructions countdown counter. |
| void StartInobjectSlackTracking(); |
| |
| // True if the object constructions countdown counter is a range |
| // [kSlackTrackingCounterEnd, kSlackTrackingCounterStart]. |
| inline bool IsInobjectSlackTrackingInProgress(); |
| |
| // Does the tracking step. |
| inline void InobjectSlackTrackingStep(); |
| |
| // Completes inobject slack tracking for the transition tree starting at this |
| // initial map. |
| void CompleteInobjectSlackTracking(); |
| |
| // Tells whether the object in the prototype property will be used |
| // for instances created from this function. If the prototype |
| // property is set to a value that is not a JSObject, the prototype |
| // property will not be used to create instances of the function. |
| // See ECMA-262, 13.2.2. |
| inline void set_non_instance_prototype(bool value); |
| inline bool has_non_instance_prototype(); |
| |
| // Tells whether the instance has a [[Construct]] internal method. |
| // This property is implemented according to ES6, section 7.2.4. |
| inline void set_is_constructor(bool value); |
| inline bool is_constructor() const; |
| |
| // Tells whether the instance with this map has a hidden prototype. |
| inline void set_has_hidden_prototype(bool value); |
| inline bool has_hidden_prototype() const; |
| |
| // Records and queries whether the instance has a named interceptor. |
| inline void set_has_named_interceptor(); |
| inline bool has_named_interceptor(); |
| |
| // Records and queries whether the instance has an indexed interceptor. |
| inline void set_has_indexed_interceptor(); |
| inline bool has_indexed_interceptor(); |
| |
| // Tells whether the instance is undetectable. |
| // An undetectable object is a special class of JSObject: 'typeof' operator |
| // returns undefined, ToBoolean returns false. Otherwise it behaves like |
| // a normal JS object. It is useful for implementing undetectable |
| // document.all in Firefox & Safari. |
| // See https://bugzilla.mozilla.org/show_bug.cgi?id=248549. |
| inline void set_is_undetectable(); |
| inline bool is_undetectable(); |
| |
| // Tells whether the instance has a [[Call]] internal method. |
| // This property is implemented according to ES6, section 7.2.3. |
| inline void set_is_callable(); |
| inline bool is_callable() const; |
| |
| inline void set_new_target_is_base(bool value); |
| inline bool new_target_is_base(); |
| inline void set_is_extensible(bool value); |
| inline bool is_extensible(); |
| inline void set_is_prototype_map(bool value); |
| inline bool is_prototype_map() const; |
| |
| inline void set_elements_kind(ElementsKind elements_kind); |
| inline ElementsKind elements_kind(); |
| |
| // Tells whether the instance has fast elements that are only Smis. |
| inline bool has_fast_smi_elements(); |
| |
| // Tells whether the instance has fast elements. |
| inline bool has_fast_object_elements(); |
| inline bool has_fast_smi_or_object_elements(); |
| inline bool has_fast_double_elements(); |
| inline bool has_fast_elements(); |
| inline bool has_sloppy_arguments_elements(); |
| inline bool has_fast_sloppy_arguments_elements(); |
| inline bool has_fast_string_wrapper_elements(); |
| inline bool has_fixed_typed_array_elements(); |
| inline bool has_dictionary_elements(); |
| |
| static bool IsValidElementsTransition(ElementsKind from_kind, |
| ElementsKind to_kind); |
| |
| // Returns true if the current map doesn't have DICTIONARY_ELEMENTS but if a |
| // map with DICTIONARY_ELEMENTS was found in the prototype chain. |
| bool DictionaryElementsInPrototypeChainOnly(); |
| |
| inline Map* ElementsTransitionMap(); |
| |
| inline FixedArrayBase* GetInitialElements(); |
| |
| // [raw_transitions]: Provides access to the transitions storage field. |
| // Don't call set_raw_transitions() directly to overwrite transitions, use |
| // the TransitionArray::ReplaceTransitions() wrapper instead! |
| DECL_ACCESSORS(raw_transitions, Object) |
| // [prototype_info]: Per-prototype metadata. Aliased with transitions |
| // (which prototype maps don't have). |
| DECL_ACCESSORS(prototype_info, Object) |
| // PrototypeInfo is created lazily using this helper (which installs it on |
| // the given prototype's map). |
| static Handle<PrototypeInfo> GetOrCreatePrototypeInfo( |
| Handle<JSObject> prototype, Isolate* isolate); |
| static Handle<PrototypeInfo> GetOrCreatePrototypeInfo( |
| Handle<Map> prototype_map, Isolate* isolate); |
| inline bool should_be_fast_prototype_map() const; |
| static void SetShouldBeFastPrototypeMap(Handle<Map> map, bool value, |
| Isolate* isolate); |
| |
| // [prototype chain validity cell]: Associated with a prototype object, |
| // stored in that object's map's PrototypeInfo, indicates that prototype |
| // chains through this object are currently valid. The cell will be |
| // invalidated and replaced when the prototype chain changes. |
| static Handle<Cell> GetOrCreatePrototypeChainValidityCell(Handle<Map> map, |
| Isolate* isolate); |
| static const int kPrototypeChainValid = 0; |
| static const int kPrototypeChainInvalid = 1; |
| |
| Map* FindRootMap(); |
| Map* FindFieldOwner(int descriptor); |
| |
| inline int GetInObjectPropertyOffset(int index); |
| |
| int NumberOfFields(); |
| |
| // TODO(ishell): candidate with JSObject::MigrateToMap(). |
| bool InstancesNeedRewriting(Map* target); |
| bool InstancesNeedRewriting(Map* target, int target_number_of_fields, |
| int target_inobject, int target_unused, |
| int* old_number_of_fields); |
| // TODO(ishell): moveit! |
| static Handle<Map> GeneralizeAllFieldRepresentations(Handle<Map> map); |
| MUST_USE_RESULT static Handle<FieldType> GeneralizeFieldType( |
| Representation rep1, Handle<FieldType> type1, Representation rep2, |
| Handle<FieldType> type2, Isolate* isolate); |
| static void GeneralizeFieldType(Handle<Map> map, int modify_index, |
| Representation new_representation, |
| Handle<FieldType> new_field_type); |
| |
| static inline Handle<Map> ReconfigureProperty( |
| Handle<Map> map, int modify_index, PropertyKind new_kind, |
| PropertyAttributes new_attributes, Representation new_representation, |
| Handle<FieldType> new_field_type, StoreMode store_mode); |
| |
| static inline Handle<Map> ReconfigureElementsKind( |
| Handle<Map> map, ElementsKind new_elements_kind); |
| |
| static Handle<Map> PrepareForDataProperty(Handle<Map> old_map, |
| int descriptor_number, |
| Handle<Object> value); |
| |
| static Handle<Map> Normalize(Handle<Map> map, PropertyNormalizationMode mode, |
| const char* reason); |
| |
| // Tells whether the map is used for JSObjects in dictionary mode (ie |
| // normalized objects, ie objects for which HasFastProperties returns false). |
| // A map can never be used for both dictionary mode and fast mode JSObjects. |
| // False by default and for HeapObjects that are not JSObjects. |
| inline void set_dictionary_map(bool value); |
| inline bool is_dictionary_map(); |
| |
| // Tells whether the instance needs security checks when accessing its |
| // properties. |
| inline void set_is_access_check_needed(bool access_check_needed); |
| inline bool is_access_check_needed(); |
| |
| // Returns true if map has a non-empty stub code cache. |
| inline bool has_code_cache(); |
| |
| // [prototype]: implicit prototype object. |
| DECL_ACCESSORS(prototype, Object) |
| // TODO(jkummerow): make set_prototype private. |
| static void SetPrototype( |
| Handle<Map> map, Handle<Object> prototype, |
| PrototypeOptimizationMode proto_mode = FAST_PROTOTYPE); |
| |
| // [constructor]: points back to the function responsible for this map. |
| // The field overlaps with the back pointer. All maps in a transition tree |
| // have the same constructor, so maps with back pointers can walk the |
| // back pointer chain until they find the map holding their constructor. |
| DECL_ACCESSORS(constructor_or_backpointer, Object) |
| inline Object* GetConstructor() const; |
| inline void SetConstructor(Object* constructor, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| // [back pointer]: points back to the parent map from which a transition |
| // leads to this map. The field overlaps with the constructor (see above). |
| inline Object* GetBackPointer(); |
| inline void SetBackPointer(Object* value, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // [instance descriptors]: describes the object. |
| DECL_ACCESSORS(instance_descriptors, DescriptorArray) |
| |
| // [layout descriptor]: describes the object layout. |
| DECL_ACCESSORS(layout_descriptor, LayoutDescriptor) |
| // |layout descriptor| accessor which can be used from GC. |
| inline LayoutDescriptor* layout_descriptor_gc_safe(); |
| inline bool HasFastPointerLayout() const; |
| |
| // |layout descriptor| accessor that is safe to call even when |
| // FLAG_unbox_double_fields is disabled (in this case Map does not contain |
| // |layout_descriptor| field at all). |
| inline LayoutDescriptor* GetLayoutDescriptor(); |
| |
| inline void UpdateDescriptors(DescriptorArray* descriptors, |
| LayoutDescriptor* layout_descriptor); |
| inline void InitializeDescriptors(DescriptorArray* descriptors, |
| LayoutDescriptor* layout_descriptor); |
| |
| // [stub cache]: contains stubs compiled for this map. |
| DECL_ACCESSORS(code_cache, FixedArray) |
| |
| // [dependent code]: list of optimized codes that weakly embed this map. |
| DECL_ACCESSORS(dependent_code, DependentCode) |
| |
| // [weak cell cache]: cache that stores a weak cell pointing to this map. |
| DECL_ACCESSORS(weak_cell_cache, Object) |
| |
| inline PropertyDetails GetLastDescriptorDetails(); |
| |
| inline int LastAdded(); |
| |
| inline int NumberOfOwnDescriptors(); |
| inline void SetNumberOfOwnDescriptors(int number); |
| |
| inline Cell* RetrieveDescriptorsPointer(); |
| |
| // Checks whether all properties are stored either in the map or on the object |
| // (inobject, properties, or elements backing store), requiring no special |
| // checks. |
| bool OnlyHasSimpleProperties(); |
| inline int EnumLength(); |
| inline void SetEnumLength(int length); |
| |
| inline bool owns_descriptors(); |
| inline void set_owns_descriptors(bool owns_descriptors); |
| inline void mark_unstable(); |
| inline bool is_stable(); |
| inline void set_migration_target(bool value); |
| inline bool is_migration_target(); |
| inline void set_immutable_proto(bool value); |
| inline bool is_immutable_proto(); |
| inline void set_construction_counter(int value); |
| inline int construction_counter(); |
| inline void deprecate(); |
| inline bool is_deprecated(); |
| inline bool CanBeDeprecated(); |
| // Returns a non-deprecated version of the input. If the input was not |
| // deprecated, it is directly returned. Otherwise, the non-deprecated version |
| // is found by re-transitioning from the root of the transition tree using the |
| // descriptor array of the map. Returns MaybeHandle<Map>() if no updated map |
| // is found. |
| static MaybeHandle<Map> TryUpdate(Handle<Map> map) WARN_UNUSED_RESULT; |
| |
| // Returns a non-deprecated version of the input. This method may deprecate |
| // existing maps along the way if encodings conflict. Not for use while |
| // gathering type feedback. Use TryUpdate in those cases instead. |
| static Handle<Map> Update(Handle<Map> map); |
| |
| static inline Handle<Map> CopyInitialMap(Handle<Map> map); |
| static Handle<Map> CopyInitialMap(Handle<Map> map, int instance_size, |
| int in_object_properties, |
| int unused_property_fields); |
| static Handle<Map> CopyDropDescriptors(Handle<Map> map); |
| static Handle<Map> CopyInsertDescriptor(Handle<Map> map, |
| Descriptor* descriptor, |
| TransitionFlag flag); |
| |
| MUST_USE_RESULT static MaybeHandle<Map> CopyWithField( |
| Handle<Map> map, Handle<Name> name, Handle<FieldType> type, |
| PropertyAttributes attributes, Representation representation, |
| TransitionFlag flag); |
| |
| MUST_USE_RESULT static MaybeHandle<Map> CopyWithConstant( |
| Handle<Map> map, |
| Handle<Name> name, |
| Handle<Object> constant, |
| PropertyAttributes attributes, |
| TransitionFlag flag); |
| |
| // Returns a new map with all transitions dropped from the given map and |
| // the ElementsKind set. |
| static Handle<Map> TransitionElementsTo(Handle<Map> map, |
| ElementsKind to_kind); |
| |
| static Handle<Map> AsElementsKind(Handle<Map> map, ElementsKind kind); |
| |
| static Handle<Map> CopyAsElementsKind(Handle<Map> map, |
| ElementsKind kind, |
| TransitionFlag flag); |
| |
| static Handle<Map> AsLanguageMode(Handle<Map> initial_map, |
| LanguageMode language_mode, |
| FunctionKind kind); |
| |
| |
| static Handle<Map> CopyForPreventExtensions(Handle<Map> map, |
| PropertyAttributes attrs_to_add, |
| Handle<Symbol> transition_marker, |
| const char* reason); |
| |
| static Handle<Map> FixProxy(Handle<Map> map, InstanceType type, int size); |
| |
| |
| // Maximal number of fast properties. Used to restrict the number of map |
| // transitions to avoid an explosion in the number of maps for objects used as |
| // dictionaries. |
| inline bool TooManyFastProperties(StoreFromKeyed store_mode); |
| static Handle<Map> TransitionToDataProperty(Handle<Map> map, |
| Handle<Name> name, |
| Handle<Object> value, |
| PropertyAttributes attributes, |
| StoreFromKeyed store_mode); |
| static Handle<Map> TransitionToAccessorProperty( |
| Isolate* isolate, Handle<Map> map, Handle<Name> name, int descriptor, |
| Handle<Object> getter, Handle<Object> setter, |
| PropertyAttributes attributes); |
| static Handle<Map> ReconfigureExistingProperty(Handle<Map> map, |
| int descriptor, |
| PropertyKind kind, |
| PropertyAttributes attributes); |
| |
| inline void AppendDescriptor(Descriptor* desc); |
| |
| // Returns a copy of the map, prepared for inserting into the transition |
| // tree (if the |map| owns descriptors then the new one will share |
| // descriptors with |map|). |
| static Handle<Map> CopyForTransition(Handle<Map> map, const char* reason); |
| |
| // Returns a copy of the map, with all transitions dropped from the |
| // instance descriptors. |
| static Handle<Map> Copy(Handle<Map> map, const char* reason); |
| static Handle<Map> Create(Isolate* isolate, int inobject_properties); |
| |
| // Returns the next free property index (only valid for FAST MODE). |
| int NextFreePropertyIndex(); |
| |
| // Returns the number of properties described in instance_descriptors |
| // filtering out properties with the specified attributes. |
| int NumberOfDescribedProperties(DescriptorFlag which = OWN_DESCRIPTORS, |
| PropertyFilter filter = ALL_PROPERTIES); |
| |
| DECLARE_CAST(Map) |
| |
| // Code cache operations. |
| |
| // Clears the code cache. |
| inline void ClearCodeCache(Heap* heap); |
| |
| // Update code cache. |
| static void UpdateCodeCache(Handle<Map> map, |
| Handle<Name> name, |
| Handle<Code> code); |
| |
| // Extend the descriptor array of the map with the list of descriptors. |
| // In case of duplicates, the latest descriptor is used. |
| static void AppendCallbackDescriptors(Handle<Map> map, |
| Handle<Object> descriptors); |
| |
| static inline int SlackForArraySize(int old_size, int size_limit); |
| |
| static void EnsureDescriptorSlack(Handle<Map> map, int slack); |
| |
| Code* LookupInCodeCache(Name* name, Code::Flags code); |
| |
| // Computes a hash value for this map, to be used in HashTables and such. |
| int Hash(); |
| |
| // Returns the transitioned map for this map with the most generic |
| // elements_kind that's found in |candidates|, or |nullptr| if no match is |
| // found at all. |
| Map* FindElementsKindTransitionedMap(MapHandleList* candidates); |
| |
| inline bool CanTransition(); |
| |
| inline bool IsBooleanMap(); |
| inline bool IsPrimitiveMap(); |
| inline bool IsJSReceiverMap(); |
| inline bool IsJSObjectMap(); |
| inline bool IsJSArrayMap(); |
| inline bool IsJSFunctionMap(); |
| inline bool IsStringMap(); |
| inline bool IsJSProxyMap(); |
| inline bool IsJSGlobalProxyMap(); |
| inline bool IsJSGlobalObjectMap(); |
| inline bool IsJSTypedArrayMap(); |
| inline bool IsJSDataViewMap(); |
| |
| inline bool CanOmitMapChecks(); |
| |
| static void AddDependentCode(Handle<Map> map, |
| DependentCode::DependencyGroup group, |
| Handle<Code> code); |
| |
| bool IsMapInArrayPrototypeChain(); |
| |
| static Handle<WeakCell> WeakCellForMap(Handle<Map> map); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Map) |
| DECLARE_VERIFIER(Map) |
| |
| #ifdef VERIFY_HEAP |
| void DictionaryMapVerify(); |
| void VerifyOmittedMapChecks(); |
| #endif |
| |
| inline int visitor_id(); |
| inline void set_visitor_id(int visitor_id); |
| |
| static Handle<Map> TransitionToPrototype(Handle<Map> map, |
| Handle<Object> prototype, |
| PrototypeOptimizationMode mode); |
| |
| static Handle<Map> TransitionToImmutableProto(Handle<Map> map); |
| |
| static const int kMaxPreAllocatedPropertyFields = 255; |
| |
| // Layout description. |
| static const int kInstanceSizesOffset = HeapObject::kHeaderSize; |
| static const int kInstanceAttributesOffset = kInstanceSizesOffset + kIntSize; |
| static const int kBitField3Offset = kInstanceAttributesOffset + kIntSize; |
| static const int kPrototypeOffset = kBitField3Offset + kPointerSize; |
| static const int kConstructorOrBackPointerOffset = |
| kPrototypeOffset + kPointerSize; |
| // When there is only one transition, it is stored directly in this field; |
| // otherwise a transition array is used. |
| // For prototype maps, this slot is used to store this map's PrototypeInfo |
| // struct. |
| static const int kTransitionsOrPrototypeInfoOffset = |
| kConstructorOrBackPointerOffset + kPointerSize; |
| static const int kDescriptorsOffset = |
| kTransitionsOrPrototypeInfoOffset + kPointerSize; |
| #if V8_DOUBLE_FIELDS_UNBOXING |
| static const int kLayoutDescriptorOffset = kDescriptorsOffset + kPointerSize; |
| static const int kCodeCacheOffset = kLayoutDescriptorOffset + kPointerSize; |
| #else |
| static const int kLayoutDescriptorOffset = 1; // Must not be ever accessed. |
| static const int kCodeCacheOffset = kDescriptorsOffset + kPointerSize; |
| #endif |
| static const int kDependentCodeOffset = kCodeCacheOffset + kPointerSize; |
| static const int kWeakCellCacheOffset = kDependentCodeOffset + kPointerSize; |
| static const int kSize = kWeakCellCacheOffset + kPointerSize; |
| |
| // Layout of pointer fields. Heap iteration code relies on them |
| // being continuously allocated. |
| static const int kPointerFieldsBeginOffset = Map::kPrototypeOffset; |
| static const int kPointerFieldsEndOffset = kSize; |
| |
| // Byte offsets within kInstanceSizesOffset. |
| static const int kInstanceSizeOffset = kInstanceSizesOffset + 0; |
| static const int kInObjectPropertiesOrConstructorFunctionIndexByte = 1; |
| static const int kInObjectPropertiesOrConstructorFunctionIndexOffset = |
| kInstanceSizesOffset + kInObjectPropertiesOrConstructorFunctionIndexByte; |
| // Note there is one byte available for use here. |
| static const int kUnusedByte = 2; |
| static const int kUnusedOffset = kInstanceSizesOffset + kUnusedByte; |
| static const int kVisitorIdByte = 3; |
| static const int kVisitorIdOffset = kInstanceSizesOffset + kVisitorIdByte; |
| |
| // Byte offsets within kInstanceAttributesOffset attributes. |
| #if V8_TARGET_LITTLE_ENDIAN |
| // Order instance type and bit field together such that they can be loaded |
| // together as a 16-bit word with instance type in the lower 8 bits regardless |
| // of endianess. Also provide endian-independent offset to that 16-bit word. |
| static const int kInstanceTypeOffset = kInstanceAttributesOffset + 0; |
| static const int kBitFieldOffset = kInstanceAttributesOffset + 1; |
| #else |
| static const int kBitFieldOffset = kInstanceAttributesOffset + 0; |
| static const int kInstanceTypeOffset = kInstanceAttributesOffset + 1; |
| #endif |
| static const int kInstanceTypeAndBitFieldOffset = |
| kInstanceAttributesOffset + 0; |
| static const int kBitField2Offset = kInstanceAttributesOffset + 2; |
| static const int kUnusedPropertyFieldsByte = 3; |
| static const int kUnusedPropertyFieldsOffset = kInstanceAttributesOffset + 3; |
| |
| STATIC_ASSERT(kInstanceTypeAndBitFieldOffset == |
| Internals::kMapInstanceTypeAndBitFieldOffset); |
| |
| // Bit positions for bit field. |
| static const int kHasNonInstancePrototype = 0; |
| static const int kIsCallable = 1; |
| static const int kHasNamedInterceptor = 2; |
| static const int kHasIndexedInterceptor = 3; |
| static const int kIsUndetectable = 4; |
| static const int kIsAccessCheckNeeded = 5; |
| static const int kIsConstructor = 6; |
| // Bit 7 is free. |
| |
| // Bit positions for bit field 2 |
| static const int kIsExtensible = 0; |
| // Bit 1 is free. |
| class IsPrototypeMapBits : public BitField<bool, 2, 1> {}; |
| class ElementsKindBits: public BitField<ElementsKind, 3, 5> {}; |
| |
| // Derived values from bit field 2 |
| static const int8_t kMaximumBitField2FastElementValue = static_cast<int8_t>( |
| (FAST_ELEMENTS + 1) << Map::ElementsKindBits::kShift) - 1; |
| static const int8_t kMaximumBitField2FastSmiElementValue = |
| static_cast<int8_t>((FAST_SMI_ELEMENTS + 1) << |
| Map::ElementsKindBits::kShift) - 1; |
| static const int8_t kMaximumBitField2FastHoleyElementValue = |
| static_cast<int8_t>((FAST_HOLEY_ELEMENTS + 1) << |
| Map::ElementsKindBits::kShift) - 1; |
| static const int8_t kMaximumBitField2FastHoleySmiElementValue = |
| static_cast<int8_t>((FAST_HOLEY_SMI_ELEMENTS + 1) << |
| Map::ElementsKindBits::kShift) - 1; |
| |
| typedef FixedBodyDescriptor<kPointerFieldsBeginOffset, |
| kPointerFieldsEndOffset, |
| kSize> BodyDescriptor; |
| |
| // Compares this map to another to see if they describe equivalent objects. |
| // If |mode| is set to CLEAR_INOBJECT_PROPERTIES, |other| is treated as if |
| // it had exactly zero inobject properties. |
| // The "shared" flags of both this map and |other| are ignored. |
| bool EquivalentToForNormalization(Map* other, PropertyNormalizationMode mode); |
| |
| // Returns true if given field is unboxed double. |
| inline bool IsUnboxedDoubleField(FieldIndex index); |
| |
| #if TRACE_MAPS |
| static void TraceTransition(const char* what, Map* from, Map* to, Name* name); |
| static void TraceAllTransitions(Map* map); |
| #endif |
| |
| static inline Handle<Map> AddMissingTransitionsForTesting( |
| Handle<Map> split_map, Handle<DescriptorArray> descriptors, |
| Handle<LayoutDescriptor> full_layout_descriptor); |
| |
| private: |
| // Returns the map that this (root) map transitions to if its elements_kind |
| // is changed to |elements_kind|, or |nullptr| if no such map is cached yet. |
| Map* LookupElementsTransitionMap(ElementsKind elements_kind); |
| |
| // Tries to replay property transitions starting from this (root) map using |
| // the descriptor array of the |map|. The |root_map| is expected to have |
| // proper elements kind and therefore elements kinds transitions are not |
| // taken by this function. Returns |nullptr| if matching transition map is |
| // not found. |
| Map* TryReplayPropertyTransitions(Map* map); |
| |
| static void ConnectTransition(Handle<Map> parent, Handle<Map> child, |
| Handle<Name> name, SimpleTransitionFlag flag); |
| |
| bool EquivalentToForTransition(Map* other); |
| static Handle<Map> RawCopy(Handle<Map> map, int instance_size); |
| static Handle<Map> ShareDescriptor(Handle<Map> map, |
| Handle<DescriptorArray> descriptors, |
| Descriptor* descriptor); |
| static Handle<Map> AddMissingTransitions( |
| Handle<Map> map, Handle<DescriptorArray> descriptors, |
| Handle<LayoutDescriptor> full_layout_descriptor); |
| static void InstallDescriptors( |
| Handle<Map> parent_map, Handle<Map> child_map, int new_descriptor, |
| Handle<DescriptorArray> descriptors, |
| Handle<LayoutDescriptor> full_layout_descriptor); |
| static Handle<Map> CopyAddDescriptor(Handle<Map> map, |
| Descriptor* descriptor, |
| TransitionFlag flag); |
| static Handle<Map> CopyReplaceDescriptors( |
| Handle<Map> map, Handle<DescriptorArray> descriptors, |
| Handle<LayoutDescriptor> layout_descriptor, TransitionFlag flag, |
| MaybeHandle<Name> maybe_name, const char* reason, |
| SimpleTransitionFlag simple_flag); |
| |
| static Handle<Map> CopyReplaceDescriptor(Handle<Map> map, |
| Handle<DescriptorArray> descriptors, |
| Descriptor* descriptor, |
| int index, |
| TransitionFlag flag); |
| static MUST_USE_RESULT MaybeHandle<Map> TryReconfigureExistingProperty( |
| Handle<Map> map, int descriptor, PropertyKind kind, |
| PropertyAttributes attributes, const char** reason); |
| |
| static Handle<Map> CopyNormalized(Handle<Map> map, |
| PropertyNormalizationMode mode); |
| |
| static Handle<Map> Reconfigure(Handle<Map> map, |
| ElementsKind new_elements_kind, |
| int modify_index, PropertyKind new_kind, |
| PropertyAttributes new_attributes, |
| Representation new_representation, |
| Handle<FieldType> new_field_type, |
| StoreMode store_mode); |
| |
| static Handle<Map> CopyGeneralizeAllRepresentations( |
| Handle<Map> map, ElementsKind elements_kind, int modify_index, |
| StoreMode store_mode, PropertyKind kind, PropertyAttributes attributes, |
| const char* reason); |
| |
| // Fires when the layout of an object with a leaf map changes. |
| // This includes adding transitions to the leaf map or changing |
| // the descriptor array. |
| inline void NotifyLeafMapLayoutChange(); |
| |
| void DeprecateTransitionTree(); |
| |
| void ReplaceDescriptors(DescriptorArray* new_descriptors, |
| LayoutDescriptor* new_layout_descriptor); |
| |
| |
| Map* FindLastMatchMap(int verbatim, int length, DescriptorArray* descriptors); |
| |
| // Update field type of the given descriptor to new representation and new |
| // type. The type must be prepared for storing in descriptor array: |
| // it must be either a simple type or a map wrapped in a weak cell. |
| void UpdateFieldType(int descriptor_number, Handle<Name> name, |
| Representation new_representation, |
| Handle<Object> new_wrapped_type); |
| |
| void PrintReconfiguration(FILE* file, int modify_index, PropertyKind kind, |
| PropertyAttributes attributes); |
| void PrintGeneralization(FILE* file, const char* reason, int modify_index, |
| int split, int descriptors, bool constant_to_field, |
| Representation old_representation, |
| Representation new_representation, |
| MaybeHandle<FieldType> old_field_type, |
| MaybeHandle<Object> old_value, |
| MaybeHandle<FieldType> new_field_type, |
| MaybeHandle<Object> new_value); |
| |
| static const int kFastPropertiesSoftLimit = 12; |
| static const int kMaxFastProperties = 128; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Map); |
| }; |
| |
| |
| // An abstract superclass, a marker class really, for simple structure classes. |
| // It doesn't carry much functionality but allows struct classes to be |
| // identified in the type system. |
| class Struct: public HeapObject { |
| public: |
| inline void InitializeBody(int object_size); |
| DECLARE_CAST(Struct) |
| }; |
| |
| |
| // A simple one-element struct, useful where smis need to be boxed. |
| class Box : public Struct { |
| public: |
| // [value]: the boxed contents. |
| DECL_ACCESSORS(value, Object) |
| |
| DECLARE_CAST(Box) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Box) |
| DECLARE_VERIFIER(Box) |
| |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Box); |
| }; |
| |
| |
| // Container for metadata stored on each prototype map. |
| class PrototypeInfo : public Struct { |
| public: |
| static const int UNREGISTERED = -1; |
| |
| // [prototype_users]: WeakFixedArray containing maps using this prototype, |
| // or Smi(0) if uninitialized. |
| DECL_ACCESSORS(prototype_users, Object) |
| |
| // [object_create_map]: A field caching the map for Object.create(prototype). |
| static inline void SetObjectCreateMap(Handle<PrototypeInfo> info, |
| Handle<Map> map); |
| inline Map* ObjectCreateMap(); |
| inline bool HasObjectCreateMap(); |
| |
| // [registry_slot]: Slot in prototype's user registry where this user |
| // is stored. Returns UNREGISTERED if this prototype has not been registered. |
| inline int registry_slot() const; |
| inline void set_registry_slot(int slot); |
| // [validity_cell]: Cell containing the validity bit for prototype chains |
| // going through this object, or Smi(0) if uninitialized. |
| // When a prototype object changes its map, then both its own validity cell |
| // and those of all "downstream" prototypes are invalidated; handlers for a |
| // given receiver embed the currently valid cell for that receiver's prototype |
| // during their compilation and check it on execution. |
| DECL_ACCESSORS(validity_cell, Object) |
| // [bit_field] |
| inline int bit_field() const; |
| inline void set_bit_field(int bit_field); |
| |
| DECL_BOOLEAN_ACCESSORS(should_be_fast_map) |
| |
| DECLARE_CAST(PrototypeInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(PrototypeInfo) |
| DECLARE_VERIFIER(PrototypeInfo) |
| |
| static const int kPrototypeUsersOffset = HeapObject::kHeaderSize; |
| static const int kRegistrySlotOffset = kPrototypeUsersOffset + kPointerSize; |
| static const int kValidityCellOffset = kRegistrySlotOffset + kPointerSize; |
| static const int kObjectCreateMap = kValidityCellOffset + kPointerSize; |
| static const int kBitFieldOffset = kObjectCreateMap + kPointerSize; |
| static const int kSize = kBitFieldOffset + kPointerSize; |
| |
| // Bit field usage. |
| static const int kShouldBeFastBit = 0; |
| |
| private: |
| DECL_ACCESSORS(object_create_map, Object) |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PrototypeInfo); |
| }; |
| |
| |
| // Pair used to store both a ScopeInfo and an extension object in the extension |
| // slot of a block context. Needed in the rare case where a declaration block |
| // scope (a "varblock" as used to desugar parameter destructuring) also contains |
| // a sloppy direct eval. (In no other case both are needed at the same time.) |
| class SloppyBlockWithEvalContextExtension : public Struct { |
| public: |
| // [scope_info]: Scope info. |
| DECL_ACCESSORS(scope_info, ScopeInfo) |
| // [extension]: Extension object. |
| DECL_ACCESSORS(extension, JSObject) |
| |
| DECLARE_CAST(SloppyBlockWithEvalContextExtension) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(SloppyBlockWithEvalContextExtension) |
| DECLARE_VERIFIER(SloppyBlockWithEvalContextExtension) |
| |
| static const int kScopeInfoOffset = HeapObject::kHeaderSize; |
| static const int kExtensionOffset = kScopeInfoOffset + kPointerSize; |
| static const int kSize = kExtensionOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SloppyBlockWithEvalContextExtension); |
| }; |
| |
| |
| // Script describes a script which has been added to the VM. |
| class Script: public Struct { |
| public: |
| // Script types. |
| enum Type { |
| TYPE_NATIVE = 0, |
| TYPE_EXTENSION = 1, |
| TYPE_NORMAL = 2, |
| TYPE_WASM = 3 |
| }; |
| |
| // Script compilation types. |
| enum CompilationType { |
| COMPILATION_TYPE_HOST = 0, |
| COMPILATION_TYPE_EVAL = 1 |
| }; |
| |
| // Script compilation state. |
| enum CompilationState { |
| COMPILATION_STATE_INITIAL = 0, |
| COMPILATION_STATE_COMPILED = 1 |
| }; |
| |
| // [source]: the script source. |
| DECL_ACCESSORS(source, Object) |
| |
| // [name]: the script name. |
| DECL_ACCESSORS(name, Object) |
| |
| // [id]: the script id. |
| DECL_INT_ACCESSORS(id) |
| |
| // [line_offset]: script line offset in resource from where it was extracted. |
| DECL_INT_ACCESSORS(line_offset) |
| |
| // [column_offset]: script column offset in resource from where it was |
| // extracted. |
| DECL_INT_ACCESSORS(column_offset) |
| |
| // [context_data]: context data for the context this script was compiled in. |
| DECL_ACCESSORS(context_data, Object) |
| |
| // [wrapper]: the wrapper cache. This is either undefined or a WeakCell. |
| DECL_ACCESSORS(wrapper, HeapObject) |
| |
| // [type]: the script type. |
| DECL_INT_ACCESSORS(type) |
| |
| // [line_ends]: FixedArray of line ends positions. |
| DECL_ACCESSORS(line_ends, Object) |
| |
| // [eval_from_shared]: for eval scripts the shared function info for the |
| // function from which eval was called. |
| DECL_ACCESSORS(eval_from_shared, Object) |
| |
| // [eval_from_position]: the source position in the code for the function |
| // from which eval was called, as positive integer. Or the code offset in the |
| // code from which eval was called, as negative integer. |
| DECL_INT_ACCESSORS(eval_from_position) |
| |
| // [shared_function_infos]: weak fixed array containing all shared |
| // function infos created from this script. |
| DECL_ACCESSORS(shared_function_infos, Object) |
| |
| // [flags]: Holds an exciting bitfield. |
| DECL_INT_ACCESSORS(flags) |
| |
| // [source_url]: sourceURL from magic comment |
| DECL_ACCESSORS(source_url, Object) |
| |
| // [source_mapping_url]: sourceMappingURL magic comment |
| DECL_ACCESSORS(source_mapping_url, Object) |
| |
| // [wasm_object]: the wasm object this script belongs to. |
| // This must only be called if the type of this script is TYPE_WASM. |
| DECL_ACCESSORS(wasm_object, JSObject) |
| |
| // [wasm_function_index]: the wasm function index this script belongs to. |
| // This must only be called if the type of this script is TYPE_WASM. |
| DECL_INT_ACCESSORS(wasm_function_index) |
| |
| // [compilation_type]: how the the script was compiled. Encoded in the |
| // 'flags' field. |
| inline CompilationType compilation_type(); |
| inline void set_compilation_type(CompilationType type); |
| |
| // [compilation_state]: determines whether the script has already been |
| // compiled. Encoded in the 'flags' field. |
| inline CompilationState compilation_state(); |
| inline void set_compilation_state(CompilationState state); |
| |
| // [hide_source]: determines whether the script source can be exposed as |
| // function source. Encoded in the 'flags' field. |
| inline bool hide_source(); |
| inline void set_hide_source(bool value); |
| |
| // [origin_options]: optional attributes set by the embedder via ScriptOrigin, |
| // and used by the embedder to make decisions about the script. V8 just passes |
| // this through. Encoded in the 'flags' field. |
| inline v8::ScriptOriginOptions origin_options(); |
| inline void set_origin_options(ScriptOriginOptions origin_options); |
| |
| DECLARE_CAST(Script) |
| |
| // If script source is an external string, check that the underlying |
| // resource is accessible. Otherwise, always return true. |
| inline bool HasValidSource(); |
| |
| static Handle<Object> GetNameOrSourceURL(Handle<Script> script); |
| |
| // Set eval origin for stack trace formatting. |
| static void SetEvalOrigin(Handle<Script> script, |
| Handle<SharedFunctionInfo> outer, |
| int eval_position); |
| // Retrieve source position from where eval was called. |
| int GetEvalPosition(); |
| |
| // Init line_ends array with source code positions of line ends. |
| static void InitLineEnds(Handle<Script> script); |
| |
| // Convert code offset into column number. |
| static int GetColumnNumber(Handle<Script> script, int code_offset); |
| |
| // Convert code offset into (zero-based) line number. |
| // The non-handlified version does not allocate, but may be much slower. |
| static int GetLineNumber(Handle<Script> script, int code_offset); |
| int GetLineNumber(int code_pos); |
| |
| // Carries information about a source position. |
| struct PositionInfo { |
| PositionInfo() : line(-1), column(-1), line_start(-1), line_end(-1) {} |
| |
| int line; // Zero-based line number. |
| int column; // Zero-based column number. |
| int line_start; // Position of first character in line. |
| int line_end; // Position of last (non-linebreak) character in line. |
| }; |
| |
| // Specifies whether to add offsets to position infos. |
| enum OffsetFlag { NO_OFFSET = 0, WITH_OFFSET = 1 }; |
| |
| // Retrieves information about the given position, optionally with an offset. |
| // Returns false on failure, and otherwise writes into the given info object |
| // on success. |
| bool GetPositionInfo(int position, PositionInfo* info, |
| OffsetFlag offset_flag); |
| |
| // Get the JS object wrapping the given script; create it if none exists. |
| static Handle<JSObject> GetWrapper(Handle<Script> script); |
| |
| // Look through the list of existing shared function infos to find one |
| // that matches the function literal. Return empty handle if not found. |
| MaybeHandle<SharedFunctionInfo> FindSharedFunctionInfo(FunctionLiteral* fun); |
| |
| // Iterate over all script objects on the heap. |
| class Iterator { |
| public: |
| explicit Iterator(Isolate* isolate); |
| Script* Next(); |
| |
| private: |
| WeakFixedArray::Iterator iterator_; |
| DISALLOW_COPY_AND_ASSIGN(Iterator); |
| }; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Script) |
| DECLARE_VERIFIER(Script) |
| |
| static const int kSourceOffset = HeapObject::kHeaderSize; |
| static const int kNameOffset = kSourceOffset + kPointerSize; |
| static const int kLineOffsetOffset = kNameOffset + kPointerSize; |
| static const int kColumnOffsetOffset = kLineOffsetOffset + kPointerSize; |
| static const int kContextOffset = kColumnOffsetOffset + kPointerSize; |
| static const int kWrapperOffset = kContextOffset + kPointerSize; |
| static const int kTypeOffset = kWrapperOffset + kPointerSize; |
| static const int kLineEndsOffset = kTypeOffset + kPointerSize; |
| static const int kIdOffset = kLineEndsOffset + kPointerSize; |
| static const int kEvalFromSharedOffset = kIdOffset + kPointerSize; |
| static const int kEvalFromPositionOffset = |
| kEvalFromSharedOffset + kPointerSize; |
| static const int kSharedFunctionInfosOffset = |
| kEvalFromPositionOffset + kPointerSize; |
| static const int kFlagsOffset = kSharedFunctionInfosOffset + kPointerSize; |
| static const int kSourceUrlOffset = kFlagsOffset + kPointerSize; |
| static const int kSourceMappingUrlOffset = kSourceUrlOffset + kPointerSize; |
| static const int kSize = kSourceMappingUrlOffset + kPointerSize; |
| |
| private: |
| int GetLineNumberWithArray(int code_pos); |
| |
| // Bit positions in the flags field. |
| static const int kCompilationTypeBit = 0; |
| static const int kCompilationStateBit = 1; |
| static const int kHideSourceBit = 2; |
| static const int kOriginOptionsShift = 3; |
| static const int kOriginOptionsSize = 3; |
| static const int kOriginOptionsMask = ((1 << kOriginOptionsSize) - 1) |
| << kOriginOptionsShift; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Script); |
| }; |
| |
| |
| // List of builtin functions we want to identify to improve code |
| // generation. |
| // |
| // Each entry has a name of a global object property holding an object |
| // optionally followed by ".prototype", a name of a builtin function |
| // on the object (the one the id is set for), and a label. |
| // |
| // Installation of ids for the selected builtin functions is handled |
| // by the bootstrapper. |
| #define FUNCTIONS_WITH_ID_LIST(V) \ |
| V(Array.prototype, indexOf, ArrayIndexOf) \ |
| V(Array.prototype, lastIndexOf, ArrayLastIndexOf) \ |
| V(Array.prototype, push, ArrayPush) \ |
| V(Array.prototype, pop, ArrayPop) \ |
| V(Array.prototype, shift, ArrayShift) \ |
| V(Date.prototype, getDate, DateGetDate) \ |
| V(Date.prototype, getDay, DateGetDay) \ |
| V(Date.prototype, getFullYear, DateGetFullYear) \ |
| V(Date.prototype, getHours, DateGetHours) \ |
| V(Date.prototype, getMilliseconds, DateGetMilliseconds) \ |
| V(Date.prototype, getMinutes, DateGetMinutes) \ |
| V(Date.prototype, getMonth, DateGetMonth) \ |
| V(Date.prototype, getSeconds, DateGetSeconds) \ |
| V(Date.prototype, getTime, DateGetTime) \ |
| V(Function.prototype, apply, FunctionApply) \ |
| V(Function.prototype, call, FunctionCall) \ |
| V(Object.prototype, hasOwnProperty, ObjectHasOwnProperty) \ |
| V(String.prototype, charCodeAt, StringCharCodeAt) \ |
| V(String.prototype, charAt, StringCharAt) \ |
| V(String.prototype, concat, StringConcat) \ |
| V(String.prototype, substr, StringSubstr) \ |
| V(String.prototype, toLowerCase, StringToLowerCase) \ |
| V(String.prototype, toUpperCase, StringToUpperCase) \ |
| V(String, fromCharCode, StringFromCharCode) \ |
| V(Math, random, MathRandom) \ |
| V(Math, floor, MathFloor) \ |
| V(Math, round, MathRound) \ |
| V(Math, ceil, MathCeil) \ |
| V(Math, abs, MathAbs) \ |
| V(Math, log, MathLog) \ |
| V(Math, log1p, MathLog1p) \ |
| V(Math, log2, MathLog2) \ |
| V(Math, log10, MathLog10) \ |
| V(Math, cbrt, MathCbrt) \ |
| V(Math, exp, MathExp) \ |
| V(Math, expm1, MathExpm1) \ |
| V(Math, sqrt, MathSqrt) \ |
| V(Math, pow, MathPow) \ |
| V(Math, max, MathMax) \ |
| V(Math, min, MathMin) \ |
| V(Math, cos, MathCos) \ |
| V(Math, cosh, MathCosh) \ |
| V(Math, sign, MathSign) \ |
| V(Math, sin, MathSin) \ |
| V(Math, sinh, MathSinh) \ |
| V(Math, tan, MathTan) \ |
| V(Math, tanh, MathTanh) \ |
| V(Math, acos, MathAcos) \ |
| V(Math, acosh, MathAcosh) \ |
| V(Math, asin, MathAsin) \ |
| V(Math, asinh, MathAsinh) \ |
| V(Math, atan, MathAtan) \ |
| V(Math, atan2, MathAtan2) \ |
| V(Math, atanh, MathAtanh) \ |
| V(Math, imul, MathImul) \ |
| V(Math, clz32, MathClz32) \ |
| V(Math, fround, MathFround) \ |
| V(Math, trunc, MathTrunc) \ |
| V(Number, parseInt, NumberParseInt) \ |
| V(Number.prototype, toString, NumberToString) |
| |
| #define ATOMIC_FUNCTIONS_WITH_ID_LIST(V) \ |
| V(Atomics, load, AtomicsLoad) \ |
| V(Atomics, store, AtomicsStore) |
| |
| enum BuiltinFunctionId { |
| kArrayCode, |
| #define DECLARE_FUNCTION_ID(ignored1, ignore2, name) \ |
| k##name, |
| FUNCTIONS_WITH_ID_LIST(DECLARE_FUNCTION_ID) |
| ATOMIC_FUNCTIONS_WITH_ID_LIST(DECLARE_FUNCTION_ID) |
| #undef DECLARE_FUNCTION_ID |
| // Fake id for a special case of Math.pow. Note, it continues the |
| // list of math functions. |
| kMathPowHalf, |
| // These are manually assigned to special getters during bootstrapping. |
| kArrayBufferByteLength, |
| kDataViewBuffer, |
| kDataViewByteLength, |
| kDataViewByteOffset, |
| kGlobalDecodeURI, |
| kGlobalDecodeURIComponent, |
| kGlobalEncodeURI, |
| kGlobalEncodeURIComponent, |
| kGlobalEscape, |
| kGlobalUnescape, |
| kTypedArrayByteLength, |
| kTypedArrayByteOffset, |
| kTypedArrayLength, |
| kSharedArrayBufferByteLength, |
| }; |
| |
| |
| // Result of searching in an optimized code map of a SharedFunctionInfo. Note |
| // that both {code} and {literals} can be NULL to pass search result status. |
| struct CodeAndLiterals { |
| Code* code; // Cached optimized code. |
| LiteralsArray* literals; // Cached literals array. |
| }; |
| |
| |
| // SharedFunctionInfo describes the JSFunction information that can be |
| // shared by multiple instances of the function. |
| class SharedFunctionInfo: public HeapObject { |
| public: |
| // [name]: Function name. |
| DECL_ACCESSORS(name, Object) |
| |
| // [code]: Function code. |
| DECL_ACCESSORS(code, Code) |
| |
| // Get the abstract code associated with the function, which will either be |
| // a Code object or a BytecodeArray. |
| inline AbstractCode* abstract_code(); |
| |
| inline void ReplaceCode(Code* code); |
| inline bool HasBaselineCode() const; |
| |
| // [optimized_code_map]: Map from native context to optimized code |
| // and a shared literals array. |
| DECL_ACCESSORS(optimized_code_map, FixedArray) |
| |
| // Returns entry from optimized code map for specified context and OSR entry. |
| // Note that {code == nullptr, literals == nullptr} indicates no matching |
| // entry has been found, whereas {code, literals == nullptr} indicates that |
| // code is context-independent. |
| CodeAndLiterals SearchOptimizedCodeMap(Context* native_context, |
| BailoutId osr_ast_id); |
| |
| // Clear optimized code map. |
| void ClearOptimizedCodeMap(); |
| |
| // Like ClearOptimizedCodeMap, but preserves literals. |
| void ClearCodeFromOptimizedCodeMap(); |
| |
| // We have a special root FixedArray with the right shape and values |
| // to represent the cleared optimized code map. This predicate checks |
| // if that root is installed. |
| inline bool OptimizedCodeMapIsCleared() const; |
| |
| // Removes a specific optimized code object from the optimized code map. |
| // In case of non-OSR the code reference is cleared from the cache entry but |
| // the entry itself is left in the map in order to proceed sharing literals. |
| void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason); |
| |
| // Trims the optimized code map after entries have been removed. |
| void TrimOptimizedCodeMap(int shrink_by); |
| |
| static Handle<LiteralsArray> FindOrCreateLiterals( |
| Handle<SharedFunctionInfo> shared, Handle<Context> native_context); |
| |
| // Add or update entry in the optimized code map for context-independent code. |
| static void AddSharedCodeToOptimizedCodeMap(Handle<SharedFunctionInfo> shared, |
| Handle<Code> code); |
| |
| // Add or update entry in the optimized code map for context-dependent code. |
| // If {code} is not given, then an existing entry's code won't be overwritten. |
| static void AddToOptimizedCodeMap(Handle<SharedFunctionInfo> shared, |
| Handle<Context> native_context, |
| MaybeHandle<Code> code, |
| Handle<LiteralsArray> literals, |
| BailoutId osr_ast_id); |
| |
| // Set up the link between shared function info and the script. The shared |
| // function info is added to the list on the script. |
| static void SetScript(Handle<SharedFunctionInfo> shared, |
| Handle<Object> script_object); |
| |
| // Layout description of the optimized code map. |
| static const int kSharedCodeIndex = 0; |
| static const int kEntriesStart = 1; |
| static const int kContextOffset = 0; |
| static const int kCachedCodeOffset = 1; |
| static const int kLiteralsOffset = 2; |
| static const int kOsrAstIdOffset = 3; |
| static const int kEntryLength = 4; |
| static const int kInitialLength = kEntriesStart + kEntryLength; |
| |
| static const int kNotFound = -1; |
| |
| // Helpers for assembly code that does a backwards walk of the optimized code |
| // map. |
| static const int kOffsetToPreviousContext = |
| FixedArray::kHeaderSize + kPointerSize * (kContextOffset - kEntryLength); |
| static const int kOffsetToPreviousCachedCode = |
| FixedArray::kHeaderSize + |
| kPointerSize * (kCachedCodeOffset - kEntryLength); |
| static const int kOffsetToPreviousLiterals = |
| FixedArray::kHeaderSize + kPointerSize * (kLiteralsOffset - kEntryLength); |
| static const int kOffsetToPreviousOsrAstId = |
| FixedArray::kHeaderSize + kPointerSize * (kOsrAstIdOffset - kEntryLength); |
| |
| // [scope_info]: Scope info. |
| DECL_ACCESSORS(scope_info, ScopeInfo) |
| |
| // [construct stub]: Code stub for constructing instances of this function. |
| DECL_ACCESSORS(construct_stub, Code) |
| |
| // Sets the given code as the construct stub, and marks builtin code objects |
| // as a construct stub. |
| void SetConstructStub(Code* code); |
| |
| // Returns if this function has been compiled to native code yet. |
| inline bool is_compiled() const; |
| |
| // [length]: The function length - usually the number of declared parameters. |
| // Use up to 2^30 parameters. |
| inline int length() const; |
| inline void set_length(int value); |
| |
| // [internal formal parameter count]: The declared number of parameters. |
| // For subclass constructors, also includes new.target. |
| // The size of function's frame is internal_formal_parameter_count + 1. |
| inline int internal_formal_parameter_count() const; |
| inline void set_internal_formal_parameter_count(int value); |
| |
| // Set the formal parameter count so the function code will be |
| // called without using argument adaptor frames. |
| inline void DontAdaptArguments(); |
| |
| // [expected_nof_properties]: Expected number of properties for the function. |
| inline int expected_nof_properties() const; |
| inline void set_expected_nof_properties(int value); |
| |
| // [feedback_metadata] - describes ast node feedback from full-codegen and |
| // (increasingly) from crankshafted code where sufficient feedback isn't |
| // available. |
| DECL_ACCESSORS(feedback_metadata, TypeFeedbackMetadata) |
| |
| #if TRACE_MAPS |
| // [unique_id] - For --trace-maps purposes, an identifier that's persistent |
| // even if the GC moves this SharedFunctionInfo. |
| inline int unique_id() const; |
| inline void set_unique_id(int value); |
| #endif |
| |
| // [instance class name]: class name for instances. |
| DECL_ACCESSORS(instance_class_name, Object) |
| |
| // [function data]: This field holds some additional data for function. |
| // Currently it has one of: |
| // - a FunctionTemplateInfo to make benefit the API [IsApiFunction()]. |
| // - a BytecodeArray for the interpreter [HasBytecodeArray()]. |
| // - a FixedArray with Asm->Wasm conversion [HasAsmWasmData()]. |
| DECL_ACCESSORS(function_data, Object) |
| |
| inline bool IsApiFunction(); |
| inline FunctionTemplateInfo* get_api_func_data(); |
| inline void set_api_func_data(FunctionTemplateInfo* data); |
| inline bool HasBytecodeArray(); |
| inline BytecodeArray* bytecode_array(); |
| inline void set_bytecode_array(BytecodeArray* bytecode); |
| inline void ClearBytecodeArray(); |
| inline bool HasAsmWasmData(); |
| inline FixedArray* asm_wasm_data(); |
| inline void set_asm_wasm_data(FixedArray* data); |
| inline void ClearAsmWasmData(); |
| |
| // [function identifier]: This field holds an additional identifier for the |
| // function. |
| // - a Smi identifying a builtin function [HasBuiltinFunctionId()]. |
| // - a String identifying the function's inferred name [HasInferredName()]. |
| // The inferred_name is inferred from variable or property |
| // assignment of this function. It is used to facilitate debugging and |
| // profiling of JavaScript code written in OO style, where almost |
| // all functions are anonymous but are assigned to object |
| // properties. |
| DECL_ACCESSORS(function_identifier, Object) |
| |
| inline bool HasBuiltinFunctionId(); |
| inline BuiltinFunctionId builtin_function_id(); |
| inline void set_builtin_function_id(BuiltinFunctionId id); |
| inline bool HasInferredName(); |
| inline String* inferred_name(); |
| inline void set_inferred_name(String* inferred_name); |
| |
| // [script info]: Script from which the function originates. |
| DECL_ACCESSORS(script, Object) |
| |
| // [num_literals]: Number of literals used by this function. |
| inline int num_literals() const; |
| inline void set_num_literals(int value); |
| |
| // [start_position_and_type]: Field used to store both the source code |
| // position, whether or not the function is a function expression, |
| // and whether or not the function is a toplevel function. The two |
| // least significants bit indicates whether the function is an |
| // expression and the rest contains the source code position. |
| inline int start_position_and_type() const; |
| inline void set_start_position_and_type(int value); |
| |
| // The function is subject to debugging if a debug info is attached. |
| inline bool HasDebugInfo(); |
| inline DebugInfo* GetDebugInfo(); |
| |
| // A function has debug code if the compiled code has debug break slots. |
| inline bool HasDebugCode(); |
| |
| // [debug info]: Debug information. |
| DECL_ACCESSORS(debug_info, Object) |
| |
| // The function's name if it is non-empty, otherwise the inferred name. |
| String* DebugName(); |
| |
| // Used for flags such as --hydrogen-filter. |
| bool PassesFilter(const char* raw_filter); |
| |
| // Position of the 'function' token in the script source. |
| inline int function_token_position() const; |
| inline void set_function_token_position(int function_token_position); |
| |
| // Position of this function in the script source. |
| inline int start_position() const; |
| inline void set_start_position(int start_position); |
| |
| // End position of this function in the script source. |
| inline int end_position() const; |
| inline void set_end_position(int end_position); |
| |
| // Is this function a named function expression in the source code. |
| DECL_BOOLEAN_ACCESSORS(is_named_expression) |
| |
| // Is this function a top-level function (scripts, evals). |
| DECL_BOOLEAN_ACCESSORS(is_toplevel) |
| |
| // Bit field containing various information collected by the compiler to |
| // drive optimization. |
| inline int compiler_hints() const; |
| inline void set_compiler_hints(int value); |
| |
| inline int ast_node_count() const; |
| inline void set_ast_node_count(int count); |
| |
| inline int profiler_ticks() const; |
| inline void set_profiler_ticks(int ticks); |
| |
| // Inline cache age is used to infer whether the function survived a context |
| // disposal or not. In the former case we reset the opt_count. |
| inline int ic_age(); |
| inline void set_ic_age(int age); |
| |
| // Indicates if this function can be lazy compiled. |
| // This is used to determine if we can safely flush code from a function |
| // when doing GC if we expect that the function will no longer be used. |
| DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation) |
| |
| // Indicates if this function can be lazy compiled without a context. |
| // This is used to determine if we can force compilation without reaching |
| // the function through program execution but through other means (e.g. heap |
| // iteration by the debugger). |
| DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation_without_context) |
| |
| // Indicates whether optimizations have been disabled for this |
| // shared function info. If a function is repeatedly optimized or if |
| // we cannot optimize the function we disable optimization to avoid |
| // spending time attempting to optimize it again. |
| DECL_BOOLEAN_ACCESSORS(optimization_disabled) |
| |
| // Indicates the language mode. |
| inline LanguageMode language_mode(); |
| inline void set_language_mode(LanguageMode language_mode); |
| |
| // False if the function definitely does not allocate an arguments object. |
| DECL_BOOLEAN_ACCESSORS(uses_arguments) |
| |
| // Indicates that this function uses a super property (or an eval that may |
| // use a super property). |
| // This is needed to set up the [[HomeObject]] on the function instance. |
| DECL_BOOLEAN_ACCESSORS(needs_home_object) |
| |
| // True if the function has any duplicated parameter names. |
| DECL_BOOLEAN_ACCESSORS(has_duplicate_parameters) |
| |
| // Indicates whether the function is a native function. |
| // These needs special treatment in .call and .apply since |
| // null passed as the receiver should not be translated to the |
| // global object. |
| DECL_BOOLEAN_ACCESSORS(native) |
| |
| // Indicate that this function should always be inlined in optimized code. |
| DECL_BOOLEAN_ACCESSORS(force_inline) |
| |
| // Indicates that the function was created by the Function function. |
| // Though it's anonymous, toString should treat it as if it had the name |
| // "anonymous". We don't set the name itself so that the system does not |
| // see a binding for it. |
| DECL_BOOLEAN_ACCESSORS(name_should_print_as_anonymous) |
| |
| // Indicates that the function is either an anonymous expression |
| // or an arrow function (the name field can be set through the API, |
| // which does not change this flag). |
| DECL_BOOLEAN_ACCESSORS(is_anonymous_expression) |
| |
| // Is this a function or top-level/eval code. |
| DECL_BOOLEAN_ACCESSORS(is_function) |
| |
| // Indicates that code for this function cannot be compiled with Crankshaft. |
| DECL_BOOLEAN_ACCESSORS(dont_crankshaft) |
| |
| // Indicates that code for this function cannot be flushed. |
| DECL_BOOLEAN_ACCESSORS(dont_flush) |
| |
| // Indicates that this function is a generator. |
| DECL_BOOLEAN_ACCESSORS(is_generator) |
| |
| // Indicates that this function is an async function. |
| DECL_BOOLEAN_ACCESSORS(is_async) |
| |
| // Indicates that this function can be suspended, either via YieldExpressions |
| // or AwaitExpressions. |
| inline bool is_resumable() const; |
| |
| // Indicates that this function is an arrow function. |
| DECL_BOOLEAN_ACCESSORS(is_arrow) |
| |
| // Indicates that this function is a concise method. |
| DECL_BOOLEAN_ACCESSORS(is_concise_method) |
| |
| // Indicates that this function is a getter. |
| DECL_BOOLEAN_ACCESSORS(is_getter_function) |
| |
| // Indicates that this function is a setter. |
| DECL_BOOLEAN_ACCESSORS(is_setter_function) |
| |
| // Indicates that this function is a default constructor. |
| DECL_BOOLEAN_ACCESSORS(is_default_constructor) |
| |
| // Indicates that this function is an asm function. |
| DECL_BOOLEAN_ACCESSORS(asm_function) |
| |
| // Indicates that the the shared function info is deserialized from cache. |
| DECL_BOOLEAN_ACCESSORS(deserialized) |
| |
| // Indicates that the the shared function info has never been compiled before. |
| DECL_BOOLEAN_ACCESSORS(never_compiled) |
| |
| // Whether this function was created from a FunctionDeclaration. |
| DECL_BOOLEAN_ACCESSORS(is_declaration) |
| |
| // Indicates that asm->wasm conversion failed and should not be re-attempted. |
| DECL_BOOLEAN_ACCESSORS(is_asm_wasm_broken) |
| |
| inline FunctionKind kind(); |
| inline void set_kind(FunctionKind kind); |
| |
| // Indicates whether or not the code in the shared function support |
| // deoptimization. |
| inline bool has_deoptimization_support(); |
| |
| // Enable deoptimization support through recompiled code. |
| void EnableDeoptimizationSupport(Code* recompiled); |
| |
| // Disable (further) attempted optimization of all functions sharing this |
| // shared function info. |
| void DisableOptimization(BailoutReason reason); |
| |
| inline BailoutReason disable_optimization_reason(); |
| |
| // Lookup the bailout ID and DCHECK that it exists in the non-optimized |
| // code, returns whether it asserted (i.e., always true if assertions are |
| // disabled). |
| bool VerifyBailoutId(BailoutId id); |
| |
| // [source code]: Source code for the function. |
| bool HasSourceCode() const; |
| Handle<Object> GetSourceCode(); |
| |
| // Number of times the function was optimized. |
| inline int opt_count(); |
| inline void set_opt_count(int opt_count); |
| |
| // Number of times the function was deoptimized. |
| inline void set_deopt_count(int value); |
| inline int deopt_count(); |
| inline void increment_deopt_count(); |
| |
| // Number of time we tried to re-enable optimization after it |
| // was disabled due to high number of deoptimizations. |
| inline void set_opt_reenable_tries(int value); |
| inline int opt_reenable_tries(); |
| |
| inline void TryReenableOptimization(); |
| |
| // Stores deopt_count, opt_reenable_tries and ic_age as bit-fields. |
| inline void set_counters(int value); |
| inline int counters() const; |
| |
| // Stores opt_count and bailout_reason as bit-fields. |
| inline void set_opt_count_and_bailout_reason(int value); |
| inline int opt_count_and_bailout_reason() const; |
| |
| inline void set_disable_optimization_reason(BailoutReason reason); |
| |
| // Tells whether this function should be subject to debugging. |
| inline bool IsSubjectToDebugging(); |
| |
| // Whether this function is defined in native code or extensions. |
| inline bool IsBuiltin(); |
| |
| // Check whether or not this function is inlineable. |
| bool IsInlineable(); |
| |
| // Source size of this function. |
| int SourceSize(); |
| |
| // Returns `false` if formal parameters include rest parameters, optional |
| // parameters, or destructuring parameters. |
| // TODO(caitp): make this a flag set during parsing |
| inline bool has_simple_parameters(); |
| |
| // Initialize a SharedFunctionInfo from a parsed function literal. |
| static void InitFromFunctionLiteral(Handle<SharedFunctionInfo> shared_info, |
| FunctionLiteral* lit); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(SharedFunctionInfo) |
| DECLARE_VERIFIER(SharedFunctionInfo) |
| |
| void ResetForNewContext(int new_ic_age); |
| |
| // Iterate over all shared function infos. |
| class Iterator { |
| public: |
| explicit Iterator(Isolate* isolate); |
| SharedFunctionInfo* Next(); |
| |
| private: |
| bool NextScript(); |
| |
| Script::Iterator script_iterator_; |
| WeakFixedArray::Iterator sfi_iterator_; |
| DisallowHeapAllocation no_gc_; |
| DISALLOW_COPY_AND_ASSIGN(Iterator); |
| }; |
| |
| DECLARE_CAST(SharedFunctionInfo) |
| |
| // Constants. |
| static const int kDontAdaptArgumentsSentinel = -1; |
| |
| // Layout description. |
| // Pointer fields. |
| static const int kNameOffset = HeapObject::kHeaderSize; |
| static const int kCodeOffset = kNameOffset + kPointerSize; |
| static const int kOptimizedCodeMapOffset = kCodeOffset + kPointerSize; |
| static const int kScopeInfoOffset = kOptimizedCodeMapOffset + kPointerSize; |
| static const int kConstructStubOffset = kScopeInfoOffset + kPointerSize; |
| static const int kInstanceClassNameOffset = |
| kConstructStubOffset + kPointerSize; |
| static const int kFunctionDataOffset = |
| kInstanceClassNameOffset + kPointerSize; |
| static const int kScriptOffset = kFunctionDataOffset + kPointerSize; |
| static const int kDebugInfoOffset = kScriptOffset + kPointerSize; |
| static const int kFunctionIdentifierOffset = kDebugInfoOffset + kPointerSize; |
| static const int kFeedbackMetadataOffset = |
| kFunctionIdentifierOffset + kPointerSize; |
| #if TRACE_MAPS |
| static const int kUniqueIdOffset = kFeedbackMetadataOffset + kPointerSize; |
| static const int kLastPointerFieldOffset = kUniqueIdOffset; |
| #else |
| // Just to not break the postmortrem support with conditional offsets |
| static const int kUniqueIdOffset = kFeedbackMetadataOffset; |
| static const int kLastPointerFieldOffset = kFeedbackMetadataOffset; |
| #endif |
| |
| #if V8_HOST_ARCH_32_BIT |
| // Smi fields. |
| static const int kLengthOffset = kLastPointerFieldOffset + kPointerSize; |
| static const int kFormalParameterCountOffset = kLengthOffset + kPointerSize; |
| static const int kExpectedNofPropertiesOffset = |
| kFormalParameterCountOffset + kPointerSize; |
| static const int kNumLiteralsOffset = |
| kExpectedNofPropertiesOffset + kPointerSize; |
| static const int kStartPositionAndTypeOffset = |
| kNumLiteralsOffset + kPointerSize; |
| static const int kEndPositionOffset = |
| kStartPositionAndTypeOffset + kPointerSize; |
| static const int kFunctionTokenPositionOffset = |
| kEndPositionOffset + kPointerSize; |
| static const int kCompilerHintsOffset = |
| kFunctionTokenPositionOffset + kPointerSize; |
| static const int kOptCountAndBailoutReasonOffset = |
| kCompilerHintsOffset + kPointerSize; |
| static const int kCountersOffset = |
| kOptCountAndBailoutReasonOffset + kPointerSize; |
| static const int kAstNodeCountOffset = |
| kCountersOffset + kPointerSize; |
| static const int kProfilerTicksOffset = |
| kAstNodeCountOffset + kPointerSize; |
| |
| // Total size. |
| static const int kSize = kProfilerTicksOffset + kPointerSize; |
| #else |
| // The only reason to use smi fields instead of int fields is to allow |
| // iteration without maps decoding during garbage collections. |
| // To avoid wasting space on 64-bit architectures we use the following trick: |
| // we group integer fields into pairs |
| // The least significant integer in each pair is shifted left by 1. By doing |
| // this we guarantee that LSB of each kPointerSize aligned word is not set and |
| // thus this word cannot be treated as pointer to HeapObject during old space |
| // traversal. |
| #if V8_TARGET_LITTLE_ENDIAN |
| static const int kLengthOffset = kLastPointerFieldOffset + kPointerSize; |
| static const int kFormalParameterCountOffset = |
| kLengthOffset + kIntSize; |
| |
| static const int kExpectedNofPropertiesOffset = |
| kFormalParameterCountOffset + kIntSize; |
| static const int kNumLiteralsOffset = |
| kExpectedNofPropertiesOffset + kIntSize; |
| |
| static const int kEndPositionOffset = |
| kNumLiteralsOffset + kIntSize; |
| static const int kStartPositionAndTypeOffset = |
| kEndPositionOffset + kIntSize; |
| |
| static const int kFunctionTokenPositionOffset = |
| kStartPositionAndTypeOffset + kIntSize; |
| static const int kCompilerHintsOffset = |
| kFunctionTokenPositionOffset + kIntSize; |
| |
| static const int kOptCountAndBailoutReasonOffset = |
| kCompilerHintsOffset + kIntSize; |
| static const int kCountersOffset = |
| kOptCountAndBailoutReasonOffset + kIntSize; |
| |
| static const int kAstNodeCountOffset = |
| kCountersOffset + kIntSize; |
| static const int kProfilerTicksOffset = |
| kAstNodeCountOffset + kIntSize; |
| |
| // Total size. |
| static const int kSize = kProfilerTicksOffset + kIntSize; |
| |
| #elif V8_TARGET_BIG_ENDIAN |
| static const int kFormalParameterCountOffset = |
| kLastPointerFieldOffset + kPointerSize; |
| static const int kLengthOffset = kFormalParameterCountOffset + kIntSize; |
| |
| static const int kNumLiteralsOffset = kLengthOffset + kIntSize; |
| static const int kExpectedNofPropertiesOffset = kNumLiteralsOffset + kIntSize; |
| |
| static const int kStartPositionAndTypeOffset = |
| kExpectedNofPropertiesOffset + kIntSize; |
| static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize; |
| |
| static const int kCompilerHintsOffset = kEndPositionOffset + kIntSize; |
| static const int kFunctionTokenPositionOffset = |
| kCompilerHintsOffset + kIntSize; |
| |
| static const int kCountersOffset = kFunctionTokenPositionOffset + kIntSize; |
| static const int kOptCountAndBailoutReasonOffset = kCountersOffset + kIntSize; |
| |
| static const int kProfilerTicksOffset = |
| kOptCountAndBailoutReasonOffset + kIntSize; |
| static const int kAstNodeCountOffset = kProfilerTicksOffset + kIntSize; |
| |
| // Total size. |
| static const int kSize = kAstNodeCountOffset + kIntSize; |
| |
| #else |
| #error Unknown byte ordering |
| #endif // Big endian |
| #endif // 64-bit |
| |
| |
| static const int kAlignedSize = POINTER_SIZE_ALIGN(kSize); |
| |
| typedef FixedBodyDescriptor<kNameOffset, |
| kLastPointerFieldOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| |
| // Bit positions in start_position_and_type. |
| // The source code start position is in the 30 most significant bits of |
| // the start_position_and_type field. |
| static const int kIsNamedExpressionBit = 0; |
| static const int kIsTopLevelBit = 1; |
| static const int kStartPositionShift = 2; |
| static const int kStartPositionMask = ~((1 << kStartPositionShift) - 1); |
| |
| // Bit positions in compiler_hints. |
| enum CompilerHints { |
| // byte 0 |
| kAllowLazyCompilation, |
| kAllowLazyCompilationWithoutContext, |
| kOptimizationDisabled, |
| kNeverCompiled, |
| kNative, |
| kStrictModeFunction, |
| kUsesArguments, |
| kNeedsHomeObject, |
| // byte 1 |
| kHasDuplicateParameters, |
| kForceInline, |
| kIsAsmFunction, |
| kIsAnonymousExpression, |
| kNameShouldPrintAsAnonymous, |
| kIsFunction, |
| kDontCrankshaft, |
| kDontFlush, |
| // byte 2 |
| kFunctionKind, |
| kIsArrow = kFunctionKind, |
| kIsGenerator, |
| kIsConciseMethod, |
| kIsDefaultConstructor, |
| kIsSubclassConstructor, |
| kIsBaseConstructor, |
| kIsGetterFunction, |
| kIsSetterFunction, |
| // byte 3 |
| kIsAsyncFunction, |
| kDeserialized, |
| kIsDeclaration, |
| kIsAsmWasmBroken, |
| kCompilerHintsCount, // Pseudo entry |
| }; |
| // kFunctionKind has to be byte-aligned |
| STATIC_ASSERT((kFunctionKind % kBitsPerByte) == 0); |
| // Make sure that FunctionKind and byte 2 are in sync: |
| #define ASSERT_FUNCTION_KIND_ORDER(functionKind, compilerFunctionKind) \ |
| STATIC_ASSERT(FunctionKind::functionKind == \ |
| 1 << (compilerFunctionKind - kFunctionKind)) |
| ASSERT_FUNCTION_KIND_ORDER(kArrowFunction, kIsArrow); |
| ASSERT_FUNCTION_KIND_ORDER(kGeneratorFunction, kIsGenerator); |
| ASSERT_FUNCTION_KIND_ORDER(kConciseMethod, kIsConciseMethod); |
| ASSERT_FUNCTION_KIND_ORDER(kDefaultConstructor, kIsDefaultConstructor); |
| ASSERT_FUNCTION_KIND_ORDER(kSubclassConstructor, kIsSubclassConstructor); |
| ASSERT_FUNCTION_KIND_ORDER(kBaseConstructor, kIsBaseConstructor); |
| ASSERT_FUNCTION_KIND_ORDER(kGetterFunction, kIsGetterFunction); |
| ASSERT_FUNCTION_KIND_ORDER(kSetterFunction, kIsSetterFunction); |
| #undef ASSERT_FUNCTION_KIND_ORDER |
| |
| class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 9> {}; |
| |
| class DeoptCountBits : public BitField<int, 0, 4> {}; |
| class OptReenableTriesBits : public BitField<int, 4, 18> {}; |
| class ICAgeBits : public BitField<int, 22, 8> {}; |
| |
| class OptCountBits : public BitField<int, 0, 22> {}; |
| class DisabledOptimizationReasonBits : public BitField<int, 22, 8> {}; |
| |
| private: |
| #if V8_HOST_ARCH_32_BIT |
| // On 32 bit platforms, compiler hints is a smi. |
| static const int kCompilerHintsSmiTagSize = kSmiTagSize; |
| static const int kCompilerHintsSize = kPointerSize; |
| #else |
| // On 64 bit platforms, compiler hints is not a smi, see comment above. |
| static const int kCompilerHintsSmiTagSize = 0; |
| static const int kCompilerHintsSize = kIntSize; |
| #endif |
| |
| STATIC_ASSERT(SharedFunctionInfo::kCompilerHintsCount <= |
| SharedFunctionInfo::kCompilerHintsSize * kBitsPerByte); |
| |
| public: |
| // Constants for optimizing codegen for strict mode function and |
| // native tests when using integer-width instructions. |
| static const int kStrictModeBit = |
| kStrictModeFunction + kCompilerHintsSmiTagSize; |
| static const int kNativeBit = kNative + kCompilerHintsSmiTagSize; |
| static const int kHasDuplicateParametersBit = |
| kHasDuplicateParameters + kCompilerHintsSmiTagSize; |
| |
| static const int kIsArrowBit = kIsArrow + kCompilerHintsSmiTagSize; |
| static const int kIsGeneratorBit = kIsGenerator + kCompilerHintsSmiTagSize; |
| static const int kIsConciseMethodBit = |
| kIsConciseMethod + kCompilerHintsSmiTagSize; |
| static const int kIsAsyncFunctionBit = |
| kIsAsyncFunction + kCompilerHintsSmiTagSize; |
| |
| static const int kAccessorFunctionBits = |
| FunctionKind::kAccessorFunction |
| << (kFunctionKind + kCompilerHintsSmiTagSize); |
| static const int kClassConstructorBits = |
| FunctionKind::kClassConstructor |
| << (kFunctionKind + kCompilerHintsSmiTagSize); |
| static const int kFunctionKindMaskBits = FunctionKindBits::kMask |
| << kCompilerHintsSmiTagSize; |
| |
| // Constants for optimizing codegen for strict mode function and |
| // native tests. |
| // Allows to use byte-width instructions. |
| static const int kStrictModeBitWithinByte = kStrictModeBit % kBitsPerByte; |
| static const int kNativeBitWithinByte = kNativeBit % kBitsPerByte; |
| static const int kHasDuplicateParametersBitWithinByte = |
| kHasDuplicateParametersBit % kBitsPerByte; |
| |
| static const int kClassConstructorBitsWithinByte = |
| FunctionKind::kClassConstructor << kCompilerHintsSmiTagSize; |
| STATIC_ASSERT(kClassConstructorBitsWithinByte < (1 << kBitsPerByte)); |
| |
| #if defined(V8_TARGET_LITTLE_ENDIAN) |
| #define BYTE_OFFSET(compiler_hint) \ |
| kCompilerHintsOffset + \ |
| (compiler_hint + kCompilerHintsSmiTagSize) / kBitsPerByte |
| #elif defined(V8_TARGET_BIG_ENDIAN) |
| #define BYTE_OFFSET(compiler_hint) \ |
| kCompilerHintsOffset + (kCompilerHintsSize - 1) - \ |
| ((compiler_hint + kCompilerHintsSmiTagSize) / kBitsPerByte) |
| #else |
| #error Unknown byte ordering |
| #endif |
| static const int kStrictModeByteOffset = BYTE_OFFSET(kStrictModeFunction); |
| static const int kNativeByteOffset = BYTE_OFFSET(kNative); |
| static const int kFunctionKindByteOffset = BYTE_OFFSET(kFunctionKind); |
| static const int kHasDuplicateParametersByteOffset = |
| BYTE_OFFSET(kHasDuplicateParameters); |
| #undef BYTE_OFFSET |
| |
| private: |
| // Returns entry from optimized code map for specified context and OSR entry. |
| // The result is either kNotFound, kSharedCodeIndex for context-independent |
| // entry or a start index of the context-dependent entry. |
| int SearchOptimizedCodeMapEntry(Context* native_context, |
| BailoutId osr_ast_id); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo); |
| }; |
| |
| |
| // Printing support. |
| struct SourceCodeOf { |
| explicit SourceCodeOf(SharedFunctionInfo* v, int max = -1) |
| : value(v), max_length(max) {} |
| const SharedFunctionInfo* value; |
| int max_length; |
| }; |
| |
| |
| std::ostream& operator<<(std::ostream& os, const SourceCodeOf& v); |
| |
| |
| class JSGeneratorObject: public JSObject { |
| public: |
| // [function]: The function corresponding to this generator object. |
| DECL_ACCESSORS(function, JSFunction) |
| |
| // [context]: The context of the suspended computation. |
| DECL_ACCESSORS(context, Context) |
| |
| // [receiver]: The receiver of the suspended computation. |
| DECL_ACCESSORS(receiver, Object) |
| |
| // [input_or_debug_pos] |
| // For executing generators: the most recent input value. |
| // For suspended new-style generators: debug information (bytecode offset). |
| // For suspended old-style generators: unused. |
| // There is currently no need to remember the most recent input value for a |
| // suspended generator. |
| DECL_ACCESSORS(input_or_debug_pos, Object) |
| |
| // [resume_mode]: The most recent resume mode. |
| enum ResumeMode { kNext, kReturn, kThrow }; |
| DECL_INT_ACCESSORS(resume_mode) |
| |
| // [continuation] |
| // |
| // A positive value indicates a suspended generator. The special |
| // kGeneratorExecuting and kGeneratorClosed values indicate that a generator |
| // cannot be resumed. |
| inline int continuation() const; |
| inline void set_continuation(int continuation); |
| inline bool is_closed() const; |
| inline bool is_executing() const; |
| inline bool is_suspended() const; |
| |
| // For suspended generators: the source position at which the generator |
| // is suspended. |
| int source_position() const; |
| |
| // [operand_stack]: Saved operand stack. |
| DECL_ACCESSORS(operand_stack, FixedArray) |
| |
| DECLARE_CAST(JSGeneratorObject) |
| |
| // Dispatched behavior. |
| DECLARE_VERIFIER(JSGeneratorObject) |
| |
| // Magic sentinel values for the continuation. |
| static const int kGeneratorExecuting = -2; |
| static const int kGeneratorClosed = -1; |
| |
| // Layout description. |
| static const int kFunctionOffset = JSObject::kHeaderSize; |
| static const int kContextOffset = kFunctionOffset + kPointerSize; |
| static const int kReceiverOffset = kContextOffset + kPointerSize; |
| static const int kInputOrDebugPosOffset = kReceiverOffset + kPointerSize; |
| static const int kResumeModeOffset = kInputOrDebugPosOffset + kPointerSize; |
| static const int kContinuationOffset = kResumeModeOffset + kPointerSize; |
| static const int kOperandStackOffset = kContinuationOffset + kPointerSize; |
| static const int kSize = kOperandStackOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject); |
| }; |
| |
| |
| // JSBoundFunction describes a bound function exotic object. |
| class JSBoundFunction : public JSObject { |
| public: |
| // [bound_target_function]: The wrapped function object. |
| DECL_ACCESSORS(bound_target_function, JSReceiver) |
| |
| // [bound_this]: The value that is always passed as the this value when |
| // calling the wrapped function. |
| DECL_ACCESSORS(bound_this, Object) |
| |
| // [bound_arguments]: A list of values whose elements are used as the first |
| // arguments to any call to the wrapped function. |
| DECL_ACCESSORS(bound_arguments, FixedArray) |
| |
| static MaybeHandle<String> GetName(Isolate* isolate, |
| Handle<JSBoundFunction> function); |
| static MaybeHandle<Context> GetFunctionRealm( |
| Handle<JSBoundFunction> function); |
| |
| DECLARE_CAST(JSBoundFunction) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSBoundFunction) |
| DECLARE_VERIFIER(JSBoundFunction) |
| |
| // The bound function's string representation implemented according |
| // to ES6 section 19.2.3.5 Function.prototype.toString ( ). |
| static Handle<String> ToString(Handle<JSBoundFunction> function); |
| |
| // Layout description. |
| static const int kBoundTargetFunctionOffset = JSObject::kHeaderSize; |
| static const int kBoundThisOffset = kBoundTargetFunctionOffset + kPointerSize; |
| static const int kBoundArgumentsOffset = kBoundThisOffset + kPointerSize; |
| static const int kSize = kBoundArgumentsOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSBoundFunction); |
| }; |
| |
| |
| // JSFunction describes JavaScript functions. |
| class JSFunction: public JSObject { |
| public: |
| // [prototype_or_initial_map]: |
| DECL_ACCESSORS(prototype_or_initial_map, Object) |
| |
| // [shared]: The information about the function that |
| // can be shared by instances. |
| DECL_ACCESSORS(shared, SharedFunctionInfo) |
| |
| static const int kLengthDescriptorIndex = 0; |
| static const int kNameDescriptorIndex = 1; |
| |
| // [context]: The context for this function. |
| inline Context* context(); |
| inline void set_context(Object* context); |
| inline JSObject* global_proxy(); |
| inline Context* native_context(); |
| |
| static Handle<Object> GetName(Isolate* isolate, Handle<JSFunction> function); |
| static MaybeHandle<Smi> GetLength(Isolate* isolate, |
| Handle<JSFunction> function); |
| static Handle<Context> GetFunctionRealm(Handle<JSFunction> function); |
| |
| // [code]: The generated code object for this function. Executed |
| // when the function is invoked, e.g. foo() or new foo(). See |
| // [[Call]] and [[Construct]] description in ECMA-262, section |
| // 8.6.2, page 27. |
| inline Code* code(); |
| inline void set_code(Code* code); |
| inline void set_code_no_write_barrier(Code* code); |
| inline void ReplaceCode(Code* code); |
| |
| // Get the abstract code associated with the function, which will either be |
| // a Code object or a BytecodeArray. |
| inline AbstractCode* abstract_code(); |
| |
| // Tells whether this function inlines the given shared function info. |
| bool Inlines(SharedFunctionInfo* candidate); |
| |
| // Tells whether or not this function has been optimized. |
| inline bool IsOptimized(); |
| |
| // Mark this function for lazy recompilation. The function will be recompiled |
| // the next time it is executed. |
| void MarkForBaseline(); |
| void MarkForOptimization(); |
| void AttemptConcurrentOptimization(); |
| |
| // Tells whether or not the function is already marked for lazy recompilation. |
| inline bool IsMarkedForBaseline(); |
| inline bool IsMarkedForOptimization(); |
| inline bool IsMarkedForConcurrentOptimization(); |
| |
| // Tells whether or not the function is on the concurrent recompilation queue. |
| inline bool IsInOptimizationQueue(); |
| |
| // Completes inobject slack tracking on initial map if it is active. |
| inline void CompleteInobjectSlackTrackingIfActive(); |
| |
| // [literals]: Fixed array holding the materialized literals. |
| // |
| // If the function contains object, regexp or array literals, the |
| // literals array prefix contains the object, regexp, and array |
| // function to be used when creating these literals. This is |
| // necessary so that we do not dynamically lookup the object, regexp |
| // or array functions. Performing a dynamic lookup, we might end up |
| // using the functions from a new context that we should not have |
| // access to. For API objects we store the boilerplate in the literal array. |
| DECL_ACCESSORS(literals, LiteralsArray) |
| |
| static void EnsureLiterals(Handle<JSFunction> function); |
| inline TypeFeedbackVector* feedback_vector(); |
| |
| // Unconditionally clear the type feedback vector (including vector ICs). |
| void ClearTypeFeedbackInfo(); |
| |
| // Clear the type feedback vector with a more subtle policy at GC time. |
| void ClearTypeFeedbackInfoAtGCTime(); |
| |
| // The initial map for an object created by this constructor. |
| inline Map* initial_map(); |
| static void SetInitialMap(Handle<JSFunction> function, Handle<Map> map, |
| Handle<Object> prototype); |
| inline bool has_initial_map(); |
| static void EnsureHasInitialMap(Handle<JSFunction> function); |
| |
| // Creates a map that matches the constructor's initial map, but with |
| // [[prototype]] being new.target.prototype. Because new.target can be a |
| // JSProxy, this can call back into JavaScript. |
| static MUST_USE_RESULT MaybeHandle<Map> GetDerivedMap( |
| Isolate* isolate, Handle<JSFunction> constructor, |
| Handle<JSReceiver> new_target); |
| |
| // Get and set the prototype property on a JSFunction. If the |
| // function has an initial map the prototype is set on the initial |
| // map. Otherwise, the prototype is put in the initial map field |
| // until an initial map is needed. |
| inline bool has_prototype(); |
| inline bool has_instance_prototype(); |
| inline Object* prototype(); |
| inline Object* instance_prototype(); |
| static void SetPrototype(Handle<JSFunction> function, |
| Handle<Object> value); |
| static void SetInstancePrototype(Handle<JSFunction> function, |
| Handle<Object> value); |
| |
| // After prototype is removed, it will not be created when accessed, and |
| // [[Construct]] from this function will not be allowed. |
| bool RemovePrototype(); |
| |
| // Returns if this function has been compiled to native code yet. |
| inline bool is_compiled(); |
| |
| // [next_function_link]: Links functions into various lists, e.g. the list |
| // of optimized functions hanging off the native_context. The CodeFlusher |
| // uses this link to chain together flushing candidates. Treated weakly |
| // by the garbage collector. |
| DECL_ACCESSORS(next_function_link, Object) |
| |
| // Prints the name of the function using PrintF. |
| void PrintName(FILE* out = stdout); |
| |
| DECLARE_CAST(JSFunction) |
| |
| // Calculate the instance size and in-object properties count. |
| void CalculateInstanceSize(InstanceType instance_type, |
| int requested_internal_fields, int* instance_size, |
| int* in_object_properties); |
| void CalculateInstanceSizeForDerivedClass(InstanceType instance_type, |
| int requested_internal_fields, |
| int* instance_size, |
| int* in_object_properties); |
| static void CalculateInstanceSizeHelper(InstanceType instance_type, |
| int requested_internal_fields, |
| int requested_in_object_properties, |
| int* instance_size, |
| int* in_object_properties); |
| // Visiting policy flags define whether the code entry or next function |
| // should be visited or not. |
| enum BodyVisitingPolicy { |
| kVisitCodeEntry = 1 << 0, |
| kVisitNextFunction = 1 << 1, |
| |
| kSkipCodeEntryAndNextFunction = 0, |
| kVisitCodeEntryAndNextFunction = kVisitCodeEntry | kVisitNextFunction |
| }; |
| // Iterates the function object according to the visiting policy. |
| template <BodyVisitingPolicy> |
| class BodyDescriptorImpl; |
| |
| // Visit the whole object. |
| typedef BodyDescriptorImpl<kVisitCodeEntryAndNextFunction> BodyDescriptor; |
| |
| // Don't visit next function. |
| typedef BodyDescriptorImpl<kVisitCodeEntry> BodyDescriptorStrongCode; |
| typedef BodyDescriptorImpl<kSkipCodeEntryAndNextFunction> |
| BodyDescriptorWeakCode; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSFunction) |
| DECLARE_VERIFIER(JSFunction) |
| |
| // The function's name if it is configured, otherwise shared function info |
| // debug name. |
| static Handle<String> GetName(Handle<JSFunction> function); |
| |
| // ES6 section 9.2.11 SetFunctionName |
| // Because of the way this abstract operation is used in the spec, |
| // it should never fail. |
| static void SetName(Handle<JSFunction> function, Handle<Name> name, |
| Handle<String> prefix); |
| |
| // The function's displayName if it is set, otherwise name if it is |
| // configured, otherwise shared function info |
| // debug name. |
| static Handle<String> GetDebugName(Handle<JSFunction> function); |
| |
| // The function's string representation implemented according to |
| // ES6 section 19.2.3.5 Function.prototype.toString ( ). |
| static Handle<String> ToString(Handle<JSFunction> function); |
| |
| // Layout descriptors. The last property (from kNonWeakFieldsEndOffset to |
| // kSize) is weak and has special handling during garbage collection. |
| static const int kPrototypeOrInitialMapOffset = JSObject::kHeaderSize; |
| static const int kSharedFunctionInfoOffset = |
| kPrototypeOrInitialMapOffset + kPointerSize; |
| static const int kContextOffset = kSharedFunctionInfoOffset + kPointerSize; |
| static const int kLiteralsOffset = kContextOffset + kPointerSize; |
| static const int kNonWeakFieldsEndOffset = kLiteralsOffset + kPointerSize; |
| static const int kCodeEntryOffset = kNonWeakFieldsEndOffset; |
| static const int kNextFunctionLinkOffset = kCodeEntryOffset + kPointerSize; |
| static const int kSize = kNextFunctionLinkOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSFunction); |
| }; |
| |
| |
| // JSGlobalProxy's prototype must be a JSGlobalObject or null, |
| // and the prototype is hidden. JSGlobalProxy always delegates |
| // property accesses to its prototype if the prototype is not null. |
| // |
| // A JSGlobalProxy can be reinitialized which will preserve its identity. |
| // |
| // Accessing a JSGlobalProxy requires security check. |
| |
| class JSGlobalProxy : public JSObject { |
| public: |
| // [native_context]: the owner native context of this global proxy object. |
| // It is null value if this object is not used by any context. |
| DECL_ACCESSORS(native_context, Object) |
| |
| // [hash]: The hash code property (undefined if not initialized yet). |
| DECL_ACCESSORS(hash, Object) |
| |
| DECLARE_CAST(JSGlobalProxy) |
| |
| inline bool IsDetachedFrom(JSGlobalObject* global) const; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSGlobalProxy) |
| DECLARE_VERIFIER(JSGlobalProxy) |
| |
| // Layout description. |
| static const int kNativeContextOffset = JSObject::kHeaderSize; |
| static const int kHashOffset = kNativeContextOffset + kPointerSize; |
| static const int kSize = kHashOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalProxy); |
| }; |
| |
| |
| // JavaScript global object. |
| class JSGlobalObject : public JSObject { |
| public: |
| // [native context]: the natives corresponding to this global object. |
| DECL_ACCESSORS(native_context, Context) |
| |
| // [global proxy]: the global proxy object of the context |
| DECL_ACCESSORS(global_proxy, JSObject) |
| |
| |
| static void InvalidatePropertyCell(Handle<JSGlobalObject> object, |
| Handle<Name> name); |
| // Ensure that the global object has a cell for the given property name. |
| static Handle<PropertyCell> EnsureEmptyPropertyCell( |
| Handle<JSGlobalObject> global, Handle<Name> name, |
| PropertyCellType cell_type, int* entry_out = nullptr); |
| |
| DECLARE_CAST(JSGlobalObject) |
| |
| inline bool IsDetached(); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSGlobalObject) |
| DECLARE_VERIFIER(JSGlobalObject) |
| |
| // Layout description. |
| static const int kNativeContextOffset = JSObject::kHeaderSize; |
| static const int kGlobalProxyOffset = kNativeContextOffset + kPointerSize; |
| static const int kHeaderSize = kGlobalProxyOffset + kPointerSize; |
| static const int kSize = kHeaderSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalObject); |
| }; |
| |
| |
| // Representation for JS Wrapper objects, String, Number, Boolean, etc. |
| class JSValue: public JSObject { |
| public: |
| // [value]: the object being wrapped. |
| DECL_ACCESSORS(value, Object) |
| |
| DECLARE_CAST(JSValue) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSValue) |
| DECLARE_VERIFIER(JSValue) |
| |
| // Layout description. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSValue); |
| }; |
| |
| |
| class DateCache; |
| |
| // Representation for JS date objects. |
| class JSDate: public JSObject { |
| public: |
| static MUST_USE_RESULT MaybeHandle<JSDate> New(Handle<JSFunction> constructor, |
| Handle<JSReceiver> new_target, |
| double tv); |
| |
| // If one component is NaN, all of them are, indicating a NaN time value. |
| // [value]: the time value. |
| DECL_ACCESSORS(value, Object) |
| // [year]: caches year. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(year, Object) |
| // [month]: caches month. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(month, Object) |
| // [day]: caches day. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(day, Object) |
| // [weekday]: caches day of week. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(weekday, Object) |
| // [hour]: caches hours. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(hour, Object) |
| // [min]: caches minutes. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(min, Object) |
| // [sec]: caches seconds. Either undefined, smi, or NaN. |
| DECL_ACCESSORS(sec, Object) |
| // [cache stamp]: sample of the date cache stamp at the |
| // moment when chached fields were cached. |
| DECL_ACCESSORS(cache_stamp, Object) |
| |
| DECLARE_CAST(JSDate) |
| |
| // Returns the time value (UTC) identifying the current time. |
| static double CurrentTimeValue(Isolate* isolate); |
| |
| // Returns the date field with the specified index. |
| // See FieldIndex for the list of date fields. |
| static Object* GetField(Object* date, Smi* index); |
| |
| static Handle<Object> SetValue(Handle<JSDate> date, double v); |
| |
| void SetValue(Object* value, bool is_value_nan); |
| |
| // ES6 section 20.3.4.45 Date.prototype [ @@toPrimitive ] |
| static MUST_USE_RESULT MaybeHandle<Object> ToPrimitive( |
| Handle<JSReceiver> receiver, Handle<Object> hint); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSDate) |
| DECLARE_VERIFIER(JSDate) |
| |
| // The order is important. It must be kept in sync with date macros |
| // in macros.py. |
| enum FieldIndex { |
| kDateValue, |
| kYear, |
| kMonth, |
| kDay, |
| kWeekday, |
| kHour, |
| kMinute, |
| kSecond, |
| kFirstUncachedField, |
| kMillisecond = kFirstUncachedField, |
| kDays, |
| kTimeInDay, |
| kFirstUTCField, |
| kYearUTC = kFirstUTCField, |
| kMonthUTC, |
| kDayUTC, |
| kWeekdayUTC, |
| kHourUTC, |
| kMinuteUTC, |
| kSecondUTC, |
| kMillisecondUTC, |
| kDaysUTC, |
| kTimeInDayUTC, |
| kTimezoneOffset |
| }; |
| |
| // Layout description. |
| static const int kValueOffset = JSObject::kHeaderSize; |
| static const int kYearOffset = kValueOffset + kPointerSize; |
| static const int kMonthOffset = kYearOffset + kPointerSize; |
| static const int kDayOffset = kMonthOffset + kPointerSize; |
| static const int kWeekdayOffset = kDayOffset + kPointerSize; |
| static const int kHourOffset = kWeekdayOffset + kPointerSize; |
| static const int kMinOffset = kHourOffset + kPointerSize; |
| static const int kSecOffset = kMinOffset + kPointerSize; |
| static const int kCacheStampOffset = kSecOffset + kPointerSize; |
| static const int kSize = kCacheStampOffset + kPointerSize; |
| |
| private: |
| inline Object* DoGetField(FieldIndex index); |
| |
| Object* GetUTCField(FieldIndex index, double value, DateCache* date_cache); |
| |
| // Computes and caches the cacheable fields of the date. |
| inline void SetCachedFields(int64_t local_time_ms, DateCache* date_cache); |
| |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDate); |
| }; |
| |
| |
| // Representation of message objects used for error reporting through |
| // the API. The messages are formatted in JavaScript so this object is |
| // a real JavaScript object. The information used for formatting the |
| // error messages are not directly accessible from JavaScript to |
| // prevent leaking information to user code called during error |
| // formatting. |
| class JSMessageObject: public JSObject { |
| public: |
| // [type]: the type of error message. |
| inline int type() const; |
| inline void set_type(int value); |
| |
| // [arguments]: the arguments for formatting the error message. |
| DECL_ACCESSORS(argument, Object) |
| |
| // [script]: the script from which the error message originated. |
| DECL_ACCESSORS(script, Object) |
| |
| // [stack_frames]: an array of stack frames for this error object. |
| DECL_ACCESSORS(stack_frames, Object) |
| |
| // [start_position]: the start position in the script for the error message. |
| inline int start_position() const; |
| inline void set_start_position(int value); |
| |
| // [end_position]: the end position in the script for the error message. |
| inline int end_position() const; |
| inline void set_end_position(int value); |
| |
| int GetLineNumber() const; |
| |
| // Returns the offset of the given position within the containing line. |
| int GetColumnNumber() const; |
| |
| // Returns the source code line containing the given source |
| // position, or the empty string if the position is invalid. |
| Handle<String> GetSourceLine() const; |
| |
| DECLARE_CAST(JSMessageObject) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSMessageObject) |
| DECLARE_VERIFIER(JSMessageObject) |
| |
| // Layout description. |
| static const int kTypeOffset = JSObject::kHeaderSize; |
| static const int kArgumentsOffset = kTypeOffset + kPointerSize; |
| static const int kScriptOffset = kArgumentsOffset + kPointerSize; |
| static const int kStackFramesOffset = kScriptOffset + kPointerSize; |
| static const int kStartPositionOffset = kStackFramesOffset + kPointerSize; |
| static const int kEndPositionOffset = kStartPositionOffset + kPointerSize; |
| static const int kSize = kEndPositionOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<HeapObject::kMapOffset, |
| kStackFramesOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| }; |
| |
| // Regular expressions |
| // The regular expression holds a single reference to a FixedArray in |
| // the kDataOffset field. |
| // The FixedArray contains the following data: |
| // - tag : type of regexp implementation (not compiled yet, atom or irregexp) |
| // - reference to the original source string |
| // - reference to the original flag string |
| // If it is an atom regexp |
| // - a reference to a literal string to search for |
| // If it is an irregexp regexp: |
| // - a reference to code for Latin1 inputs (bytecode or compiled), or a smi |
| // used for tracking the last usage (used for code flushing). |
| // - a reference to code for UC16 inputs (bytecode or compiled), or a smi |
| // used for tracking the last usage (used for code flushing).. |
| // - max number of registers used by irregexp implementations. |
| // - number of capture registers (output values) of the regexp. |
| class JSRegExp: public JSObject { |
| public: |
| // Meaning of Type: |
| // NOT_COMPILED: Initial value. No data has been stored in the JSRegExp yet. |
| // ATOM: A simple string to match against using an indexOf operation. |
| // IRREGEXP: Compiled with Irregexp. |
| enum Type { NOT_COMPILED, ATOM, IRREGEXP }; |
| enum Flag { |
| kNone = 0, |
| kGlobal = 1 << 0, |
| kIgnoreCase = 1 << 1, |
| kMultiline = 1 << 2, |
| kSticky = 1 << 3, |
| kUnicode = 1 << 4, |
| }; |
| typedef base::Flags<Flag> Flags; |
| |
| DECL_ACCESSORS(data, Object) |
| DECL_ACCESSORS(flags, Object) |
| DECL_ACCESSORS(source, Object) |
| |
| static MaybeHandle<JSRegExp> New(Handle<String> source, Flags flags); |
| static Handle<JSRegExp> Copy(Handle<JSRegExp> regexp); |
| |
| static MaybeHandle<JSRegExp> Initialize(Handle<JSRegExp> regexp, |
| Handle<String> source, Flags flags); |
| static MaybeHandle<JSRegExp> Initialize(Handle<JSRegExp> regexp, |
| Handle<String> source, |
| Handle<String> flags_string); |
| |
| inline Type TypeTag(); |
| inline int CaptureCount(); |
| inline Flags GetFlags(); |
| inline String* Pattern(); |
| inline Object* DataAt(int index); |
| // Set implementation data after the object has been prepared. |
| inline void SetDataAt(int index, Object* value); |
| |
| static int code_index(bool is_latin1) { |
| if (is_latin1) { |
| return kIrregexpLatin1CodeIndex; |
| } else { |
| return kIrregexpUC16CodeIndex; |
| } |
| } |
| |
| static int saved_code_index(bool is_latin1) { |
| if (is_latin1) { |
| return kIrregexpLatin1CodeSavedIndex; |
| } else { |
| return kIrregexpUC16CodeSavedIndex; |
| } |
| } |
| |
| DECLARE_CAST(JSRegExp) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSRegExp) |
| DECLARE_VERIFIER(JSRegExp) |
| |
| static const int kDataOffset = JSObject::kHeaderSize; |
| static const int kSourceOffset = kDataOffset + kPointerSize; |
| static const int kFlagsOffset = kSourceOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| |
| // Indices in the data array. |
| static const int kTagIndex = 0; |
| static const int kSourceIndex = kTagIndex + 1; |
| static const int kFlagsIndex = kSourceIndex + 1; |
| static const int kDataIndex = kFlagsIndex + 1; |
| // The data fields are used in different ways depending on the |
| // value of the tag. |
| // Atom regexps (literal strings). |
| static const int kAtomPatternIndex = kDataIndex; |
| |
| static const int kAtomDataSize = kAtomPatternIndex + 1; |
| |
| // Irregexp compiled code or bytecode for Latin1. If compilation |
| // fails, this fields hold an exception object that should be |
| // thrown if the regexp is used again. |
| static const int kIrregexpLatin1CodeIndex = kDataIndex; |
| // Irregexp compiled code or bytecode for UC16. If compilation |
| // fails, this fields hold an exception object that should be |
| // thrown if the regexp is used again. |
| static const int kIrregexpUC16CodeIndex = kDataIndex + 1; |
| |
| // Saved instance of Irregexp compiled code or bytecode for Latin1 that |
| // is a potential candidate for flushing. |
| static const int kIrregexpLatin1CodeSavedIndex = kDataIndex + 2; |
| // Saved instance of Irregexp compiled code or bytecode for UC16 that is |
| // a potential candidate for flushing. |
| static const int kIrregexpUC16CodeSavedIndex = kDataIndex + 3; |
| |
| // Maximal number of registers used by either Latin1 or UC16. |
| // Only used to check that there is enough stack space |
| static const int kIrregexpMaxRegisterCountIndex = kDataIndex + 4; |
| // Number of captures in the compiled regexp. |
| static const int kIrregexpCaptureCountIndex = kDataIndex + 5; |
| // Maps names of named capture groups (at indices 2i) to their corresponding |
| // capture group indices (at indices 2i + 1). |
| static const int kIrregexpCaptureNameMapIndex = kDataIndex + 6; |
| |
| static const int kIrregexpDataSize = kIrregexpCaptureNameMapIndex + 1; |
| |
| // Offsets directly into the data fixed array. |
| static const int kDataTagOffset = |
| FixedArray::kHeaderSize + kTagIndex * kPointerSize; |
| static const int kDataOneByteCodeOffset = |
| FixedArray::kHeaderSize + kIrregexpLatin1CodeIndex * kPointerSize; |
| static const int kDataUC16CodeOffset = |
| FixedArray::kHeaderSize + kIrregexpUC16CodeIndex * kPointerSize; |
| static const int kIrregexpCaptureCountOffset = |
| FixedArray::kHeaderSize + kIrregexpCaptureCountIndex * kPointerSize; |
| |
| // In-object fields. |
| static const int kLastIndexFieldIndex = 0; |
| static const int kInObjectFieldCount = 1; |
| |
| // The uninitialized value for a regexp code object. |
| static const int kUninitializedValue = -1; |
| |
| // The compilation error value for the regexp code object. The real error |
| // object is in the saved code field. |
| static const int kCompilationErrorValue = -2; |
| |
| // When we store the sweep generation at which we moved the code from the |
| // code index to the saved code index we mask it of to be in the [0:255] |
| // range. |
| static const int kCodeAgeMask = 0xff; |
| }; |
| |
| DEFINE_OPERATORS_FOR_FLAGS(JSRegExp::Flags) |
| |
| |
| class CompilationCacheShape : public BaseShape<HashTableKey*> { |
| public: |
| static inline bool IsMatch(HashTableKey* key, Object* value) { |
| return key->IsMatch(value); |
| } |
| |
| static inline uint32_t Hash(HashTableKey* key) { |
| return key->Hash(); |
| } |
| |
| static inline uint32_t HashForObject(HashTableKey* key, Object* object) { |
| return key->HashForObject(object); |
| } |
| |
| static inline Handle<Object> AsHandle(Isolate* isolate, HashTableKey* key); |
| |
| static const int kPrefixSize = 0; |
| static const int kEntrySize = 2; |
| }; |
| |
| |
| // This cache is used in two different variants. For regexp caching, it simply |
| // maps identifying info of the regexp to the cached regexp object. Scripts and |
| // eval code only gets cached after a second probe for the code object. To do |
| // so, on first "put" only a hash identifying the source is entered into the |
| // cache, mapping it to a lifetime count of the hash. On each call to Age all |
| // such lifetimes get reduced, and removed once they reach zero. If a second put |
| // is called while such a hash is live in the cache, the hash gets replaced by |
| // an actual cache entry. Age also removes stale live entries from the cache. |
| // Such entries are identified by SharedFunctionInfos pointing to either the |
| // recompilation stub, or to "old" code. This avoids memory leaks due to |
| // premature caching of scripts and eval strings that are never needed later. |
| class CompilationCacheTable: public HashTable<CompilationCacheTable, |
| CompilationCacheShape, |
| HashTableKey*> { |
| public: |
| // Find cached value for a string key, otherwise return null. |
| Handle<Object> Lookup( |
| Handle<String> src, Handle<Context> context, LanguageMode language_mode); |
| Handle<Object> LookupEval( |
| Handle<String> src, Handle<SharedFunctionInfo> shared, |
| LanguageMode language_mode, int scope_position); |
| Handle<Object> LookupRegExp(Handle<String> source, JSRegExp::Flags flags); |
| static Handle<CompilationCacheTable> Put( |
| Handle<CompilationCacheTable> cache, Handle<String> src, |
| Handle<Context> context, LanguageMode language_mode, |
| Handle<Object> value); |
| static Handle<CompilationCacheTable> PutEval( |
| Handle<CompilationCacheTable> cache, Handle<String> src, |
| Handle<SharedFunctionInfo> context, Handle<SharedFunctionInfo> value, |
| int scope_position); |
| static Handle<CompilationCacheTable> PutRegExp( |
| Handle<CompilationCacheTable> cache, Handle<String> src, |
| JSRegExp::Flags flags, Handle<FixedArray> value); |
| void Remove(Object* value); |
| void Age(); |
| static const int kHashGenerations = 10; |
| |
| DECLARE_CAST(CompilationCacheTable) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheTable); |
| }; |
| |
| |
| class CodeCacheHashTableShape : public BaseShape<HashTableKey*> { |
| public: |
| static inline bool IsMatch(HashTableKey* key, Object* value) { |
| return key->IsMatch(value); |
| } |
| |
| static inline uint32_t Hash(HashTableKey* key) { |
| return key->Hash(); |
| } |
| |
| static inline uint32_t HashForObject(HashTableKey* key, Object* object) { |
| return key->HashForObject(object); |
| } |
| |
| static inline Handle<Object> AsHandle(Isolate* isolate, HashTableKey* key); |
| |
| static const int kPrefixSize = 0; |
| // The both the key (name + flags) and value (code object) can be derived from |
| // the fixed array that stores both the name and code. |
| // TODO(verwaest): Don't allocate a fixed array but inline name and code. |
| // Rewrite IsMatch to get table + index as input rather than just the raw key. |
| static const int kEntrySize = 1; |
| }; |
| |
| |
| class CodeCacheHashTable: public HashTable<CodeCacheHashTable, |
| CodeCacheHashTableShape, |
| HashTableKey*> { |
| public: |
| static Handle<CodeCacheHashTable> Put( |
| Handle<CodeCacheHashTable> table, |
| Handle<Name> name, |
| Handle<Code> code); |
| |
| Code* Lookup(Name* name, Code::Flags flags); |
| |
| DECLARE_CAST(CodeCacheHashTable) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CodeCacheHashTable); |
| }; |
| |
| |
| class TypeFeedbackInfo: public Struct { |
| public: |
| inline int ic_total_count(); |
| inline void set_ic_total_count(int count); |
| |
| inline int ic_with_type_info_count(); |
| inline void change_ic_with_type_info_count(int delta); |
| |
| inline int ic_generic_count(); |
| inline void change_ic_generic_count(int delta); |
| |
| inline void initialize_storage(); |
| |
| inline void change_own_type_change_checksum(); |
| inline int own_type_change_checksum(); |
| |
| inline void set_inlined_type_change_checksum(int checksum); |
| inline bool matches_inlined_type_change_checksum(int checksum); |
| |
| DECLARE_CAST(TypeFeedbackInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(TypeFeedbackInfo) |
| DECLARE_VERIFIER(TypeFeedbackInfo) |
| |
| static const int kStorage1Offset = HeapObject::kHeaderSize; |
| static const int kStorage2Offset = kStorage1Offset + kPointerSize; |
| static const int kStorage3Offset = kStorage2Offset + kPointerSize; |
| static const int kSize = kStorage3Offset + kPointerSize; |
| |
| private: |
| static const int kTypeChangeChecksumBits = 7; |
| |
| class ICTotalCountField: public BitField<int, 0, |
| kSmiValueSize - kTypeChangeChecksumBits> {}; // NOLINT |
| class OwnTypeChangeChecksum: public BitField<int, |
| kSmiValueSize - kTypeChangeChecksumBits, |
| kTypeChangeChecksumBits> {}; // NOLINT |
| class ICsWithTypeInfoCountField: public BitField<int, 0, |
| kSmiValueSize - kTypeChangeChecksumBits> {}; // NOLINT |
| class InlinedTypeChangeChecksum: public BitField<int, |
| kSmiValueSize - kTypeChangeChecksumBits, |
| kTypeChangeChecksumBits> {}; // NOLINT |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackInfo); |
| }; |
| |
| |
| enum AllocationSiteMode { |
| DONT_TRACK_ALLOCATION_SITE, |
| TRACK_ALLOCATION_SITE, |
| LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE |
| }; |
| |
| |
| class AllocationSite: public Struct { |
| public: |
| static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024; |
| static const double kPretenureRatio; |
| static const int kPretenureMinimumCreated = 100; |
| |
| // Values for pretenure decision field. |
| enum PretenureDecision { |
| kUndecided = 0, |
| kDontTenure = 1, |
| kMaybeTenure = 2, |
| kTenure = 3, |
| kZombie = 4, |
| kLastPretenureDecisionValue = kZombie |
| }; |
| |
| const char* PretenureDecisionName(PretenureDecision decision); |
| |
| DECL_ACCESSORS(transition_info, Object) |
| // nested_site threads a list of sites that represent nested literals |
| // walked in a particular order. So [[1, 2], 1, 2] will have one |
| // nested_site, but [[1, 2], 3, [4]] will have a list of two. |
| DECL_ACCESSORS(nested_site, Object) |
| DECL_INT_ACCESSORS(pretenure_data) |
| DECL_INT_ACCESSORS(pretenure_create_count) |
| DECL_ACCESSORS(dependent_code, DependentCode) |
| DECL_ACCESSORS(weak_next, Object) |
| |
| inline void Initialize(); |
| |
| // This method is expensive, it should only be called for reporting. |
| bool IsNestedSite(); |
| |
| // transition_info bitfields, for constructed array transition info. |
| class ElementsKindBits: public BitField<ElementsKind, 0, 15> {}; |
| class UnusedBits: public BitField<int, 15, 14> {}; |
| class DoNotInlineBit: public BitField<bool, 29, 1> {}; |
| |
| // Bitfields for pretenure_data |
| class MementoFoundCountBits: public BitField<int, 0, 26> {}; |
| class PretenureDecisionBits: public BitField<PretenureDecision, 26, 3> {}; |
| class DeoptDependentCodeBit: public BitField<bool, 29, 1> {}; |
| STATIC_ASSERT(PretenureDecisionBits::kMax >= kLastPretenureDecisionValue); |
| |
| // Increments the mementos found counter and returns true when the first |
| // memento was found for a given allocation site. |
| inline bool IncrementMementoFoundCount(int increment = 1); |
| |
| inline void IncrementMementoCreateCount(); |
| |
| PretenureFlag GetPretenureMode(); |
| |
| void ResetPretenureDecision(); |
| |
| inline PretenureDecision pretenure_decision(); |
| inline void set_pretenure_decision(PretenureDecision decision); |
| |
| inline bool deopt_dependent_code(); |
| inline void set_deopt_dependent_code(bool deopt); |
| |
| inline int memento_found_count(); |
| inline void set_memento_found_count(int count); |
| |
| inline int memento_create_count(); |
| inline void set_memento_create_count(int count); |
| |
| // The pretenuring decision is made during gc, and the zombie state allows |
| // us to recognize when an allocation site is just being kept alive because |
| // a later traversal of new space may discover AllocationMementos that point |
| // to this AllocationSite. |
| inline bool IsZombie(); |
| |
| inline bool IsMaybeTenure(); |
| |
| inline void MarkZombie(); |
| |
| inline bool MakePretenureDecision(PretenureDecision current_decision, |
| double ratio, |
| bool maximum_size_scavenge); |
| |
| inline bool DigestPretenuringFeedback(bool maximum_size_scavenge); |
| |
| inline ElementsKind GetElementsKind(); |
| inline void SetElementsKind(ElementsKind kind); |
| |
| inline bool CanInlineCall(); |
| inline void SetDoNotInlineCall(); |
| |
| inline bool SitePointsToLiteral(); |
| |
| template <AllocationSiteUpdateMode update_or_check = |
| AllocationSiteUpdateMode::kUpdate> |
| static bool DigestTransitionFeedback(Handle<AllocationSite> site, |
| ElementsKind to_kind); |
| |
| DECLARE_PRINTER(AllocationSite) |
| DECLARE_VERIFIER(AllocationSite) |
| |
| DECLARE_CAST(AllocationSite) |
| static inline AllocationSiteMode GetMode( |
| ElementsKind boilerplate_elements_kind); |
| static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to); |
| static inline bool CanTrack(InstanceType type); |
| |
| static const int kTransitionInfoOffset = HeapObject::kHeaderSize; |
| static const int kNestedSiteOffset = kTransitionInfoOffset + kPointerSize; |
| static const int kPretenureDataOffset = kNestedSiteOffset + kPointerSize; |
| static const int kPretenureCreateCountOffset = |
| kPretenureDataOffset + kPointerSize; |
| static const int kDependentCodeOffset = |
| kPretenureCreateCountOffset + kPointerSize; |
| static const int kWeakNextOffset = kDependentCodeOffset + kPointerSize; |
| static const int kSize = kWeakNextOffset + kPointerSize; |
| |
| // During mark compact we need to take special care for the dependent code |
| // field. |
| static const int kPointerFieldsBeginOffset = kTransitionInfoOffset; |
| static const int kPointerFieldsEndOffset = kWeakNextOffset; |
| |
| // For other visitors, use the fixed body descriptor below. |
| typedef FixedBodyDescriptor<HeapObject::kHeaderSize, kSize, kSize> |
| BodyDescriptor; |
| |
| private: |
| inline bool PretenuringDecisionMade(); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite); |
| }; |
| |
| |
| class AllocationMemento: public Struct { |
| public: |
| static const int kAllocationSiteOffset = HeapObject::kHeaderSize; |
| static const int kSize = kAllocationSiteOffset + kPointerSize; |
| |
| DECL_ACCESSORS(allocation_site, Object) |
| |
| inline bool IsValid(); |
| inline AllocationSite* GetAllocationSite(); |
| inline Address GetAllocationSiteUnchecked(); |
| |
| DECLARE_PRINTER(AllocationMemento) |
| DECLARE_VERIFIER(AllocationMemento) |
| |
| DECLARE_CAST(AllocationMemento) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationMemento); |
| }; |
| |
| |
| // Representation of a slow alias as part of a sloppy arguments objects. |
| // For fast aliases (if HasSloppyArgumentsElements()): |
| // - the parameter map contains an index into the context |
| // - all attributes of the element have default values |
| // For slow aliases (if HasDictionaryArgumentsElements()): |
| // - the parameter map contains no fast alias mapping (i.e. the hole) |
| // - this struct (in the slow backing store) contains an index into the context |
| // - all attributes are available as part if the property details |
| class AliasedArgumentsEntry: public Struct { |
| public: |
| inline int aliased_context_slot() const; |
| inline void set_aliased_context_slot(int count); |
| |
| DECLARE_CAST(AliasedArgumentsEntry) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(AliasedArgumentsEntry) |
| DECLARE_VERIFIER(AliasedArgumentsEntry) |
| |
| static const int kAliasedContextSlot = HeapObject::kHeaderSize; |
| static const int kSize = kAliasedContextSlot + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AliasedArgumentsEntry); |
| }; |
| |
| |
| enum AllowNullsFlag {ALLOW_NULLS, DISALLOW_NULLS}; |
| enum RobustnessFlag {ROBUST_STRING_TRAVERSAL, FAST_STRING_TRAVERSAL}; |
| |
| |
| class StringHasher { |
| public: |
| explicit inline StringHasher(int length, uint32_t seed); |
| |
| template <typename schar> |
| static inline uint32_t HashSequentialString(const schar* chars, |
| int length, |
| uint32_t seed); |
| |
| // Reads all the data, even for long strings and computes the utf16 length. |
| static uint32_t ComputeUtf8Hash(Vector<const char> chars, |
| uint32_t seed, |
| int* utf16_length_out); |
| |
| // Calculated hash value for a string consisting of 1 to |
| // String::kMaxArrayIndexSize digits with no leading zeros (except "0"). |
| // value is represented decimal value. |
| static uint32_t MakeArrayIndexHash(uint32_t value, int length); |
| |
| // No string is allowed to have a hash of zero. That value is reserved |
| // for internal properties. If the hash calculation yields zero then we |
| // use 27 instead. |
| static const int kZeroHash = 27; |
| |
| // Reusable parts of the hashing algorithm. |
| INLINE(static uint32_t AddCharacterCore(uint32_t running_hash, uint16_t c)); |
| INLINE(static uint32_t GetHashCore(uint32_t running_hash)); |
| INLINE(static uint32_t ComputeRunningHash(uint32_t running_hash, |
| const uc16* chars, int length)); |
| INLINE(static uint32_t ComputeRunningHashOneByte(uint32_t running_hash, |
| const char* chars, |
| int length)); |
| |
| protected: |
| // Returns the value to store in the hash field of a string with |
| // the given length and contents. |
| uint32_t GetHashField(); |
| // Returns true if the hash of this string can be computed without |
| // looking at the contents. |
| inline bool has_trivial_hash(); |
| // Adds a block of characters to the hash. |
| template<typename Char> |
| inline void AddCharacters(const Char* chars, int len); |
| |
| private: |
| // Add a character to the hash. |
| inline void AddCharacter(uint16_t c); |
| // Update index. Returns true if string is still an index. |
| inline bool UpdateIndex(uint16_t c); |
| |
| int length_; |
| uint32_t raw_running_hash_; |
| uint32_t array_index_; |
| bool is_array_index_; |
| bool is_first_char_; |
| DISALLOW_COPY_AND_ASSIGN(StringHasher); |
| }; |
| |
| |
| class IteratingStringHasher : public StringHasher { |
| public: |
| static inline uint32_t Hash(String* string, uint32_t seed); |
| inline void VisitOneByteString(const uint8_t* chars, int length); |
| inline void VisitTwoByteString(const uint16_t* chars, int length); |
| |
| private: |
| inline IteratingStringHasher(int len, uint32_t seed); |
| void VisitConsString(ConsString* cons_string); |
| DISALLOW_COPY_AND_ASSIGN(IteratingStringHasher); |
| }; |
| |
| |
| // The characteristics of a string are stored in its map. Retrieving these |
| // few bits of information is moderately expensive, involving two memory |
| // loads where the second is dependent on the first. To improve efficiency |
| // the shape of the string is given its own class so that it can be retrieved |
| // once and used for several string operations. A StringShape is small enough |
| // to be passed by value and is immutable, but be aware that flattening a |
| // string can potentially alter its shape. Also be aware that a GC caused by |
| // something else can alter the shape of a string due to ConsString |
| // shortcutting. Keeping these restrictions in mind has proven to be error- |
| // prone and so we no longer put StringShapes in variables unless there is a |
| // concrete performance benefit at that particular point in the code. |
| class StringShape BASE_EMBEDDED { |
| public: |
| inline explicit StringShape(const String* s); |
| inline explicit StringShape(Map* s); |
| inline explicit StringShape(InstanceType t); |
| inline bool IsSequential(); |
| inline bool IsExternal(); |
| inline bool IsCons(); |
| inline bool IsSliced(); |
| inline bool IsIndirect(); |
| inline bool IsExternalOneByte(); |
| inline bool IsExternalTwoByte(); |
| inline bool IsSequentialOneByte(); |
| inline bool IsSequentialTwoByte(); |
| inline bool IsInternalized(); |
| inline StringRepresentationTag representation_tag(); |
| inline uint32_t encoding_tag(); |
| inline uint32_t full_representation_tag(); |
| inline uint32_t size_tag(); |
| #ifdef DEBUG |
| inline uint32_t type() { return type_; } |
| inline void invalidate() { valid_ = false; } |
| inline bool valid() { return valid_; } |
| #else |
| inline void invalidate() { } |
| #endif |
| |
| private: |
| uint32_t type_; |
| #ifdef DEBUG |
| inline void set_valid() { valid_ = true; } |
| bool valid_; |
| #else |
| inline void set_valid() { } |
| #endif |
| }; |
| |
| |
| // The Name abstract class captures anything that can be used as a property |
| // name, i.e., strings and symbols. All names store a hash value. |
| class Name: public HeapObject { |
| public: |
| // Get and set the hash field of the name. |
| inline uint32_t hash_field(); |
| inline void set_hash_field(uint32_t value); |
| |
| // Tells whether the hash code has been computed. |
| inline bool HasHashCode(); |
| |
| // Returns a hash value used for the property table |
| inline uint32_t Hash(); |
| |
| // Equality operations. |
| inline bool Equals(Name* other); |
| inline static bool Equals(Handle<Name> one, Handle<Name> two); |
| |
| // Conversion. |
| inline bool AsArrayIndex(uint32_t* index); |
| |
| // If the name is private, it can only name own properties. |
| inline bool IsPrivate(); |
| |
| inline bool IsUniqueName() const; |
| |
| // Return a string version of this name that is converted according to the |
| // rules described in ES6 section 9.2.11. |
| MUST_USE_RESULT static MaybeHandle<String> ToFunctionName(Handle<Name> name); |
| MUST_USE_RESULT static MaybeHandle<String> ToFunctionName( |
| Handle<Name> name, Handle<String> prefix); |
| |
| DECLARE_CAST(Name) |
| |
| DECLARE_PRINTER(Name) |
| #if TRACE_MAPS |
| void NameShortPrint(); |
| int NameShortPrint(Vector<char> str); |
| #endif |
| |
| // Layout description. |
| static const int kHashFieldSlot = HeapObject::kHeaderSize; |
| #if V8_TARGET_LITTLE_ENDIAN || !V8_HOST_ARCH_64_BIT |
| static const int kHashFieldOffset = kHashFieldSlot; |
| #else |
| static const int kHashFieldOffset = kHashFieldSlot + kIntSize; |
| #endif |
| static const int kSize = kHashFieldSlot + kPointerSize; |
| |
| // Mask constant for checking if a name has a computed hash code |
| // and if it is a string that is an array index. The least significant bit |
| // indicates whether a hash code has been computed. If the hash code has |
| // been computed the 2nd bit tells whether the string can be used as an |
| // array index. |
| static const int kHashNotComputedMask = 1; |
| static const int kIsNotArrayIndexMask = 1 << 1; |
| static const int kNofHashBitFields = 2; |
| |
| // Shift constant retrieving hash code from hash field. |
| static const int kHashShift = kNofHashBitFields; |
| |
| // Only these bits are relevant in the hash, since the top two are shifted |
| // out. |
| static const uint32_t kHashBitMask = 0xffffffffu >> kHashShift; |
| |
| // Array index strings this short can keep their index in the hash field. |
| static const int kMaxCachedArrayIndexLength = 7; |
| |
| // Maximum number of characters to consider when trying to convert a string |
| // value into an array index. |
| static const int kMaxArrayIndexSize = 10; |
| |
| // For strings which are array indexes the hash value has the string length |
| // mixed into the hash, mainly to avoid a hash value of zero which would be |
| // the case for the string '0'. 24 bits are used for the array index value. |
| static const int kArrayIndexValueBits = 24; |
| static const int kArrayIndexLengthBits = |
| kBitsPerInt - kArrayIndexValueBits - kNofHashBitFields; |
| |
| STATIC_ASSERT(kArrayIndexLengthBits > 0); |
| STATIC_ASSERT(kMaxArrayIndexSize < (1 << kArrayIndexLengthBits)); |
| |
| class ArrayIndexValueBits : public BitField<unsigned int, kNofHashBitFields, |
| kArrayIndexValueBits> {}; // NOLINT |
| class ArrayIndexLengthBits : public BitField<unsigned int, |
| kNofHashBitFields + kArrayIndexValueBits, |
| kArrayIndexLengthBits> {}; // NOLINT |
| |
| // Check that kMaxCachedArrayIndexLength + 1 is a power of two so we |
| // could use a mask to test if the length of string is less than or equal to |
| // kMaxCachedArrayIndexLength. |
| STATIC_ASSERT(IS_POWER_OF_TWO(kMaxCachedArrayIndexLength + 1)); |
| |
| static const unsigned int kContainsCachedArrayIndexMask = |
| (~static_cast<unsigned>(kMaxCachedArrayIndexLength) |
| << ArrayIndexLengthBits::kShift) | |
| kIsNotArrayIndexMask; |
| |
| // Value of empty hash field indicating that the hash is not computed. |
| static const int kEmptyHashField = |
| kIsNotArrayIndexMask | kHashNotComputedMask; |
| |
| protected: |
| static inline bool IsHashFieldComputed(uint32_t field); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Name); |
| }; |
| |
| |
| // ES6 symbols. |
| class Symbol: public Name { |
| public: |
| // [name]: The print name of a symbol, or undefined if none. |
| DECL_ACCESSORS(name, Object) |
| |
| DECL_INT_ACCESSORS(flags) |
| |
| // [is_private]: Whether this is a private symbol. Private symbols can only |
| // be used to designate own properties of objects. |
| DECL_BOOLEAN_ACCESSORS(is_private) |
| |
| // [is_well_known_symbol]: Whether this is a spec-defined well-known symbol, |
| // or not. Well-known symbols do not throw when an access check fails during |
| // a load. |
| DECL_BOOLEAN_ACCESSORS(is_well_known_symbol) |
| |
| DECLARE_CAST(Symbol) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Symbol) |
| DECLARE_VERIFIER(Symbol) |
| |
| // Layout description. |
| static const int kNameOffset = Name::kSize; |
| static const int kFlagsOffset = kNameOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kNameOffset, kFlagsOffset, kSize> BodyDescriptor; |
| |
| void SymbolShortPrint(std::ostream& os); |
| |
| private: |
| static const int kPrivateBit = 0; |
| static const int kWellKnownSymbolBit = 1; |
| |
| const char* PrivateSymbolToName() const; |
| |
| #if TRACE_MAPS |
| friend class Name; // For PrivateSymbolToName. |
| #endif |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Symbol); |
| }; |
| |
| |
| class ConsString; |
| |
| // The String abstract class captures JavaScript string values: |
| // |
| // Ecma-262: |
| // 4.3.16 String Value |
| // A string value is a member of the type String and is a finite |
| // ordered sequence of zero or more 16-bit unsigned integer values. |
| // |
| // All string values have a length field. |
| class String: public Name { |
| public: |
| enum Encoding { ONE_BYTE_ENCODING, TWO_BYTE_ENCODING }; |
| |
| class SubStringRange { |
| public: |
| explicit inline SubStringRange(String* string, int first = 0, |
| int length = -1); |
| class iterator; |
| inline iterator begin(); |
| inline iterator end(); |
| |
| private: |
| String* string_; |
| int first_; |
| int length_; |
| }; |
| |
| // Representation of the flat content of a String. |
| // A non-flat string doesn't have flat content. |
| // A flat string has content that's encoded as a sequence of either |
| // one-byte chars or two-byte UC16. |
| // Returned by String::GetFlatContent(). |
| class FlatContent { |
| public: |
| // Returns true if the string is flat and this structure contains content. |
| bool IsFlat() const { return state_ != NON_FLAT; } |
| // Returns true if the structure contains one-byte content. |
| bool IsOneByte() const { return state_ == ONE_BYTE; } |
| // Returns true if the structure contains two-byte content. |
| bool IsTwoByte() const { return state_ == TWO_BYTE; } |
| |
| // Return the one byte content of the string. Only use if IsOneByte() |
| // returns true. |
| Vector<const uint8_t> ToOneByteVector() const { |
| DCHECK_EQ(ONE_BYTE, state_); |
| return Vector<const uint8_t>(onebyte_start, length_); |
| } |
| // Return the two-byte content of the string. Only use if IsTwoByte() |
| // returns true. |
| Vector<const uc16> ToUC16Vector() const { |
| DCHECK_EQ(TWO_BYTE, state_); |
| return Vector<const uc16>(twobyte_start, length_); |
| } |
| |
| uc16 Get(int i) const { |
| DCHECK(i < length_); |
| DCHECK(state_ != NON_FLAT); |
| if (state_ == ONE_BYTE) return onebyte_start[i]; |
| return twobyte_start[i]; |
| } |
| |
| bool UsesSameString(const FlatContent& other) const { |
| return onebyte_start == other.onebyte_start; |
| } |
| |
| private: |
| enum State { NON_FLAT, ONE_BYTE, TWO_BYTE }; |
| |
| // Constructors only used by String::GetFlatContent(). |
| explicit FlatContent(const uint8_t* start, int length) |
| : onebyte_start(start), length_(length), state_(ONE_BYTE) {} |
| explicit FlatContent(const uc16* start, int length) |
| : twobyte_start(start), length_(length), state_(TWO_BYTE) { } |
| FlatContent() : onebyte_start(NULL), length_(0), state_(NON_FLAT) { } |
| |
| union { |
| const uint8_t* onebyte_start; |
| const uc16* twobyte_start; |
| }; |
| int length_; |
| State state_; |
| |
| friend class String; |
| friend class IterableSubString; |
| }; |
| |
| template <typename Char> |
| INLINE(Vector<const Char> GetCharVector()); |
| |
| // Get and set the length of the string. |
| inline int length() const; |
| inline void set_length(int value); |
| |
| // Get and set the length of the string using acquire loads and release |
| // stores. |
| inline int synchronized_length() const; |
| inline void synchronized_set_length(int value); |
| |
| // Returns whether this string has only one-byte chars, i.e. all of them can |
| // be one-byte encoded. This might be the case even if the string is |
| // two-byte. Such strings may appear when the embedder prefers |
| // two-byte external representations even for one-byte data. |
| inline bool IsOneByteRepresentation() const; |
| inline bool IsTwoByteRepresentation() const; |
| |
| // Cons and slices have an encoding flag that may not represent the actual |
| // encoding of the underlying string. This is taken into account here. |
| // Requires: this->IsFlat() |
| inline bool IsOneByteRepresentationUnderneath(); |
| inline bool IsTwoByteRepresentationUnderneath(); |
| |
| // NOTE: this should be considered only a hint. False negatives are |
| // possible. |
| inline bool HasOnlyOneByteChars(); |
| |
| // Get and set individual two byte chars in the string. |
| inline void Set(int index, uint16_t value); |
| // Get individual two byte char in the string. Repeated calls |
| // to this method are not efficient unless the string is flat. |
| INLINE(uint16_t Get(int index)); |
| |
| // ES6 section 7.1.3.1 ToNumber Applied to the String Type |
| static Handle<Object> ToNumber(Handle<String> subject); |
| |
| // Flattens the string. Checks first inline to see if it is |
| // necessary. Does nothing if the string is not a cons string. |
| // Flattening allocates a sequential string with the same data as |
| // the given string and mutates the cons string to a degenerate |
| // form, where the first component is the new sequential string and |
| // the second component is the empty string. If allocation fails, |
| // this function returns a failure. If flattening succeeds, this |
| // function returns the sequential string that is now the first |
| // component of the cons string. |
| // |
| // Degenerate cons strings are handled specially by the garbage |
| // collector (see IsShortcutCandidate). |
| |
| static inline Handle<String> Flatten(Handle<String> string, |
| PretenureFlag pretenure = NOT_TENURED); |
| |
| // Tries to return the content of a flat string as a structure holding either |
| // a flat vector of char or of uc16. |
| // If the string isn't flat, and therefore doesn't have flat content, the |
| // returned structure will report so, and can't provide a vector of either |
| // kind. |
| FlatContent GetFlatContent(); |
| |
| // Returns the parent of a sliced string or first part of a flat cons string. |
| // Requires: StringShape(this).IsIndirect() && this->IsFlat() |
| inline String* GetUnderlying(); |
| |
| // String relational comparison, implemented according to ES6 section 7.2.11 |
| // Abstract Relational Comparison (step 5): The comparison of Strings uses a |
| // simple lexicographic ordering on sequences of code unit values. There is no |
| // attempt to use the more complex, semantically oriented definitions of |
| // character or string equality and collating order defined in the Unicode |
| // specification. Therefore String values that are canonically equal according |
| // to the Unicode standard could test as unequal. In effect this algorithm |
| // assumes that both Strings are already in normalized form. Also, note that |
| // for strings containing supplementary characters, lexicographic ordering on |
| // sequences of UTF-16 code unit values differs from that on sequences of code |
| // point values. |
| MUST_USE_RESULT static ComparisonResult Compare(Handle<String> x, |
| Handle<String> y); |
| |
| // Perform string match of pattern on subject, starting at start index. |
| // Caller must ensure that 0 <= start_index <= sub->length(). |
| static int IndexOf(Isolate* isolate, Handle<String> sub, Handle<String> pat, |
| int start_index); |
| |
| // String equality operations. |
| inline bool Equals(String* other); |
| inline static bool Equals(Handle<String> one, Handle<String> two); |
| bool IsUtf8EqualTo(Vector<const char> str, bool allow_prefix_match = false); |
| bool IsOneByteEqualTo(Vector<const uint8_t> str); |
| bool IsTwoByteEqualTo(Vector<const uc16> str); |
| |
| // Return a UTF8 representation of the string. The string is null |
| // terminated but may optionally contain nulls. Length is returned |
| // in length_output if length_output is not a null pointer The string |
| // should be nearly flat, otherwise the performance of this method may |
| // be very slow (quadratic in the length). Setting robustness_flag to |
| // ROBUST_STRING_TRAVERSAL invokes behaviour that is robust This means it |
| // handles unexpected data without causing assert failures and it does not |
| // do any heap allocations. This is useful when printing stack traces. |
| std::unique_ptr<char[]> ToCString(AllowNullsFlag allow_nulls, |
| RobustnessFlag robustness_flag, int offset, |
| int length, int* length_output = 0); |
| std::unique_ptr<char[]> ToCString( |
| AllowNullsFlag allow_nulls = DISALLOW_NULLS, |
| RobustnessFlag robustness_flag = FAST_STRING_TRAVERSAL, |
| int* length_output = 0); |
| |
| bool ComputeArrayIndex(uint32_t* index); |
| |
| // Externalization. |
| bool MakeExternal(v8::String::ExternalStringResource* resource); |
| bool MakeExternal(v8::String::ExternalOneByteStringResource* resource); |
| |
| // Conversion. |
| inline bool AsArrayIndex(uint32_t* index); |
| |
| // Trimming. |
| enum TrimMode { kTrim, kTrimLeft, kTrimRight }; |
| static Handle<String> Trim(Handle<String> string, TrimMode mode); |
| |
| DECLARE_CAST(String) |
| |
| void PrintOn(FILE* out); |
| |
| // For use during stack traces. Performs rudimentary sanity check. |
| bool LooksValid(); |
| |
| // Dispatched behavior. |
| void StringShortPrint(StringStream* accumulator, bool show_details = true); |
| void PrintUC16(std::ostream& os, int start = 0, int end = -1); // NOLINT |
| #if defined(DEBUG) || defined(OBJECT_PRINT) |
| char* ToAsciiArray(); |
| #endif |
| DECLARE_PRINTER(String) |
| DECLARE_VERIFIER(String) |
| |
| inline bool IsFlat(); |
| |
| // Layout description. |
| static const int kLengthOffset = Name::kSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| // Max char codes. |
| static const int32_t kMaxOneByteCharCode = unibrow::Latin1::kMaxChar; |
| static const uint32_t kMaxOneByteCharCodeU = unibrow::Latin1::kMaxChar; |
| static const int kMaxUtf16CodeUnit = 0xffff; |
| static const uint32_t kMaxUtf16CodeUnitU = kMaxUtf16CodeUnit; |
| static const uc32 kMaxCodePoint = 0x10ffff; |
| |
| // Maximal string length. |
| static const int kMaxLength = (1 << 28) - 16; |
| |
| // Max length for computing hash. For strings longer than this limit the |
| // string length is used as the hash value. |
| static const int kMaxHashCalcLength = 16383; |
| |
| // Limit for truncation in short printing. |
| static const int kMaxShortPrintLength = 1024; |
| |
| // Support for regular expressions. |
| const uc16* GetTwoByteData(unsigned start); |
| |
| // Helper function for flattening strings. |
| template <typename sinkchar> |
| static void WriteToFlat(String* source, |
| sinkchar* sink, |
| int from, |
| int to); |
| |
| // The return value may point to the first aligned word containing the first |
| // non-one-byte character, rather than directly to the non-one-byte character. |
| // If the return value is >= the passed length, the entire string was |
| // one-byte. |
| static inline int NonAsciiStart(const char* chars, int length) { |
| const char* start = chars; |
| const char* limit = chars + length; |
| |
| if (length >= kIntptrSize) { |
| // Check unaligned bytes. |
| while (!IsAligned(reinterpret_cast<intptr_t>(chars), sizeof(uintptr_t))) { |
| if (static_cast<uint8_t>(*chars) > unibrow::Utf8::kMaxOneByteChar) { |
| return static_cast<int>(chars - start); |
| } |
| ++chars; |
| } |
| // Check aligned words. |
| DCHECK(unibrow::Utf8::kMaxOneByteChar == 0x7F); |
| const uintptr_t non_one_byte_mask = kUintptrAllBitsSet / 0xFF * 0x80; |
| while (chars + sizeof(uintptr_t) <= limit) { |
| if (*reinterpret_cast<const uintptr_t*>(chars) & non_one_byte_mask) { |
| return static_cast<int>(chars - start); |
| } |
| chars += sizeof(uintptr_t); |
| } |
| } |
| // Check remaining unaligned bytes. |
| while (chars < limit) { |
| if (static_cast<uint8_t>(*chars) > unibrow::Utf8::kMaxOneByteChar) { |
| return static_cast<int>(chars - start); |
| } |
| ++chars; |
| } |
| |
| return static_cast<int>(chars - start); |
| } |
| |
| static inline bool IsAscii(const char* chars, int length) { |
| return NonAsciiStart(chars, length) >= length; |
| } |
| |
| static inline bool IsAscii(const uint8_t* chars, int length) { |
| return |
| NonAsciiStart(reinterpret_cast<const char*>(chars), length) >= length; |
| } |
| |
| static inline int NonOneByteStart(const uc16* chars, int length) { |
| const uc16* limit = chars + length; |
| const uc16* start = chars; |
| while (chars < limit) { |
| if (*chars > kMaxOneByteCharCodeU) return static_cast<int>(chars - start); |
| ++chars; |
| } |
| return static_cast<int>(chars - start); |
| } |
| |
| static inline bool IsOneByte(const uc16* chars, int length) { |
| return NonOneByteStart(chars, length) >= length; |
| } |
| |
| template<class Visitor> |
| static inline ConsString* VisitFlat(Visitor* visitor, |
| String* string, |
| int offset = 0); |
| |
| static Handle<FixedArray> CalculateLineEnds(Handle<String> string, |
| bool include_ending_line); |
| |
| // Use the hash field to forward to the canonical internalized string |
| // when deserializing an internalized string. |
| inline void SetForwardedInternalizedString(String* string); |
| inline String* GetForwardedInternalizedString(); |
| |
| private: |
| friend class Name; |
| friend class StringTableInsertionKey; |
| |
| static Handle<String> SlowFlatten(Handle<ConsString> cons, |
| PretenureFlag tenure); |
| |
| // Slow case of String::Equals. This implementation works on any strings |
| // but it is most efficient on strings that are almost flat. |
| bool SlowEquals(String* other); |
| |
| static bool SlowEquals(Handle<String> one, Handle<String> two); |
| |
| // Slow case of AsArrayIndex. |
| bool SlowAsArrayIndex(uint32_t* index); |
| |
| // Compute and set the hash code. |
| uint32_t ComputeAndSetHash(); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(String); |
| }; |
| |
| |
| // The SeqString abstract class captures sequential string values. |
| class SeqString: public String { |
| public: |
| DECLARE_CAST(SeqString) |
| |
| // Layout description. |
| static const int kHeaderSize = String::kSize; |
| |
| // Truncate the string in-place if possible and return the result. |
| // In case of new_length == 0, the empty string is returned without |
| // truncating the original string. |
| MUST_USE_RESULT static Handle<String> Truncate(Handle<SeqString> string, |
| int new_length); |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqString); |
| }; |
| |
| |
| // The OneByteString class captures sequential one-byte string objects. |
| // Each character in the OneByteString is an one-byte character. |
| class SeqOneByteString: public SeqString { |
| public: |
| static const bool kHasOneByteEncoding = true; |
| |
| // Dispatched behavior. |
| inline uint16_t SeqOneByteStringGet(int index); |
| inline void SeqOneByteStringSet(int index, uint16_t value); |
| |
| // Get the address of the characters in this string. |
| inline Address GetCharsAddress(); |
| |
| inline uint8_t* GetChars(); |
| |
| DECLARE_CAST(SeqOneByteString) |
| |
| // Garbage collection support. This method is called by the |
| // garbage collector to compute the actual size of an OneByteString |
| // instance. |
| inline int SeqOneByteStringSize(InstanceType instance_type); |
| |
| // Computes the size for an OneByteString instance of a given length. |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length * kCharSize); |
| } |
| |
| // Maximal memory usage for a single sequential one-byte string. |
| static const int kMaxSize = 512 * MB - 1; |
| STATIC_ASSERT((kMaxSize - kHeaderSize) >= String::kMaxLength); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqOneByteString); |
| }; |
| |
| |
| // The TwoByteString class captures sequential unicode string objects. |
| // Each character in the TwoByteString is a two-byte uint16_t. |
| class SeqTwoByteString: public SeqString { |
| public: |
| static const bool kHasOneByteEncoding = false; |
| |
| // Dispatched behavior. |
| inline uint16_t SeqTwoByteStringGet(int index); |
| inline void SeqTwoByteStringSet(int index, uint16_t value); |
| |
| // Get the address of the characters in this string. |
| inline Address GetCharsAddress(); |
| |
| inline uc16* GetChars(); |
| |
| // For regexp code. |
| const uint16_t* SeqTwoByteStringGetData(unsigned start); |
| |
| DECLARE_CAST(SeqTwoByteString) |
| |
| // Garbage collection support. This method is called by the |
| // garbage collector to compute the actual size of a TwoByteString |
| // instance. |
| inline int SeqTwoByteStringSize(InstanceType instance_type); |
| |
| // Computes the size for a TwoByteString instance of a given length. |
| static int SizeFor(int length) { |
| return OBJECT_POINTER_ALIGN(kHeaderSize + length * kShortSize); |
| } |
| |
| // Maximal memory usage for a single sequential two-byte string. |
| static const int kMaxSize = 512 * MB - 1; |
| STATIC_ASSERT(static_cast<int>((kMaxSize - kHeaderSize)/sizeof(uint16_t)) >= |
| String::kMaxLength); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SeqTwoByteString); |
| }; |
| |
| |
| // The ConsString class describes string values built by using the |
| // addition operator on strings. A ConsString is a pair where the |
| // first and second components are pointers to other string values. |
| // One or both components of a ConsString can be pointers to other |
| // ConsStrings, creating a binary tree of ConsStrings where the leaves |
| // are non-ConsString string values. The string value represented by |
| // a ConsString can be obtained by concatenating the leaf string |
| // values in a left-to-right depth-first traversal of the tree. |
| class ConsString: public String { |
| public: |
| // First string of the cons cell. |
| inline String* first(); |
| // Doesn't check that the result is a string, even in debug mode. This is |
| // useful during GC where the mark bits confuse the checks. |
| inline Object* unchecked_first(); |
| inline void set_first(String* first, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Second string of the cons cell. |
| inline String* second(); |
| // Doesn't check that the result is a string, even in debug mode. This is |
| // useful during GC where the mark bits confuse the checks. |
| inline Object* unchecked_second(); |
| inline void set_second(String* second, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| |
| // Dispatched behavior. |
| uint16_t ConsStringGet(int index); |
| |
| DECLARE_CAST(ConsString) |
| |
| // Layout description. |
| static const int kFirstOffset = POINTER_SIZE_ALIGN(String::kSize); |
| static const int kSecondOffset = kFirstOffset + kPointerSize; |
| static const int kSize = kSecondOffset + kPointerSize; |
| |
| // Minimum length for a cons string. |
| static const int kMinLength = 13; |
| |
| typedef FixedBodyDescriptor<kFirstOffset, kSecondOffset + kPointerSize, kSize> |
| BodyDescriptor; |
| |
| DECLARE_VERIFIER(ConsString) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ConsString); |
| }; |
| |
| |
| // The Sliced String class describes strings that are substrings of another |
| // sequential string. The motivation is to save time and memory when creating |
| // a substring. A Sliced String is described as a pointer to the parent, |
| // the offset from the start of the parent string and the length. Using |
| // a Sliced String therefore requires unpacking of the parent string and |
| // adding the offset to the start address. A substring of a Sliced String |
| // are not nested since the double indirection is simplified when creating |
| // such a substring. |
| // Currently missing features are: |
| // - handling externalized parent strings |
| // - external strings as parent |
| // - truncating sliced string to enable otherwise unneeded parent to be GC'ed. |
| class SlicedString: public String { |
| public: |
| inline String* parent(); |
| inline void set_parent(String* parent, |
| WriteBarrierMode mode = UPDATE_WRITE_BARRIER); |
| inline int offset() const; |
| inline void set_offset(int offset); |
| |
| // Dispatched behavior. |
| uint16_t SlicedStringGet(int index); |
| |
| DECLARE_CAST(SlicedString) |
| |
| // Layout description. |
| static const int kParentOffset = POINTER_SIZE_ALIGN(String::kSize); |
| static const int kOffsetOffset = kParentOffset + kPointerSize; |
| static const int kSize = kOffsetOffset + kPointerSize; |
| |
| // Minimum length for a sliced string. |
| static const int kMinLength = 13; |
| |
| typedef FixedBodyDescriptor<kParentOffset, |
| kOffsetOffset + kPointerSize, kSize> |
| BodyDescriptor; |
| |
| DECLARE_VERIFIER(SlicedString) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(SlicedString); |
| }; |
| |
| |
| // The ExternalString class describes string values that are backed by |
| // a string resource that lies outside the V8 heap. ExternalStrings |
| // consist of the length field common to all strings, a pointer to the |
| // external resource. It is important to ensure (externally) that the |
| // resource is not deallocated while the ExternalString is live in the |
| // V8 heap. |
| // |
| // The API expects that all ExternalStrings are created through the |
| // API. Therefore, ExternalStrings should not be used internally. |
| class ExternalString: public String { |
| public: |
| DECLARE_CAST(ExternalString) |
| |
| // Layout description. |
| static const int kResourceOffset = POINTER_SIZE_ALIGN(String::kSize); |
| static const int kShortSize = kResourceOffset + kPointerSize; |
| static const int kResourceDataOffset = kResourceOffset + kPointerSize; |
| static const int kSize = kResourceDataOffset + kPointerSize; |
| |
| // Return whether external string is short (data pointer is not cached). |
| inline bool is_short(); |
| |
| STATIC_ASSERT(kResourceOffset == Internals::kStringResourceOffset); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalString); |
| }; |
| |
| |
| // The ExternalOneByteString class is an external string backed by an |
| // one-byte string. |
| class ExternalOneByteString : public ExternalString { |
| public: |
| static const bool kHasOneByteEncoding = true; |
| |
| typedef v8::String::ExternalOneByteStringResource Resource; |
| |
| // The underlying resource. |
| inline const Resource* resource(); |
| inline void set_resource(const Resource* buffer); |
| |
| // Update the pointer cache to the external character array. |
| // The cached pointer is always valid, as the external character array does = |
| // not move during lifetime. Deserialization is the only exception, after |
| // which the pointer cache has to be refreshed. |
| inline void update_data_cache(); |
| |
| inline const uint8_t* GetChars(); |
| |
| // Dispatched behavior. |
| inline uint16_t ExternalOneByteStringGet(int index); |
| |
| DECLARE_CAST(ExternalOneByteString) |
| |
| class BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalOneByteString); |
| }; |
| |
| |
| // The ExternalTwoByteString class is an external string backed by a UTF-16 |
| // encoded string. |
| class ExternalTwoByteString: public ExternalString { |
| public: |
| static const bool kHasOneByteEncoding = false; |
| |
| typedef v8::String::ExternalStringResource Resource; |
| |
| // The underlying string resource. |
| inline const Resource* resource(); |
| inline void set_resource(const Resource* buffer); |
| |
| // Update the pointer cache to the external character array. |
| // The cached pointer is always valid, as the external character array does = |
| // not move during lifetime. Deserialization is the only exception, after |
| // which the pointer cache has to be refreshed. |
| inline void update_data_cache(); |
| |
| inline const uint16_t* GetChars(); |
| |
| // Dispatched behavior. |
| inline uint16_t ExternalTwoByteStringGet(int index); |
| |
| // For regexp code. |
| inline const uint16_t* ExternalTwoByteStringGetData(unsigned start); |
| |
| DECLARE_CAST(ExternalTwoByteString) |
| |
| class BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalTwoByteString); |
| }; |
| |
| |
| // Utility superclass for stack-allocated objects that must be updated |
| // on gc. It provides two ways for the gc to update instances, either |
| // iterating or updating after gc. |
| class Relocatable BASE_EMBEDDED { |
| public: |
| explicit inline Relocatable(Isolate* isolate); |
| inline virtual ~Relocatable(); |
| virtual void IterateInstance(ObjectVisitor* v) { } |
| virtual void PostGarbageCollection() { } |
| |
| static void PostGarbageCollectionProcessing(Isolate* isolate); |
| static int ArchiveSpacePerThread(); |
| static char* ArchiveState(Isolate* isolate, char* to); |
| static char* RestoreState(Isolate* isolate, char* from); |
| static void Iterate(Isolate* isolate, ObjectVisitor* v); |
| static void Iterate(ObjectVisitor* v, Relocatable* top); |
| static char* Iterate(ObjectVisitor* v, char* t); |
| |
| private: |
| Isolate* isolate_; |
| Relocatable* prev_; |
| }; |
| |
| |
| // A flat string reader provides random access to the contents of a |
| // string independent of the character width of the string. The handle |
| // must be valid as long as the reader is being used. |
| class FlatStringReader : public Relocatable { |
| public: |
| FlatStringReader(Isolate* isolate, Handle<String> str); |
| FlatStringReader(Isolate* isolate, Vector<const char> input); |
| void PostGarbageCollection(); |
| inline uc32 Get(int index); |
| template <typename Char> |
| inline Char Get(int index); |
| int length() { return length_; } |
| private: |
| String** str_; |
| bool is_one_byte_; |
| int length_; |
| const void* start_; |
| }; |
| |
| |
| // This maintains an off-stack representation of the stack frames required |
| // to traverse a ConsString, allowing an entirely iterative and restartable |
| // traversal of the entire string |
| class ConsStringIterator { |
| public: |
| inline ConsStringIterator() {} |
| inline explicit ConsStringIterator(ConsString* cons_string, int offset = 0) { |
| Reset(cons_string, offset); |
| } |
| inline void Reset(ConsString* cons_string, int offset = 0) { |
| depth_ = 0; |
| // Next will always return NULL. |
| if (cons_string == NULL) return; |
| Initialize(cons_string, offset); |
| } |
| // Returns NULL when complete. |
| inline String* Next(int* offset_out) { |
| *offset_out = 0; |
| if (depth_ == 0) return NULL; |
| return Continue(offset_out); |
| } |
| |
| private: |
| static const int kStackSize = 32; |
| // Use a mask instead of doing modulo operations for stack wrapping. |
| static const int kDepthMask = kStackSize-1; |
| STATIC_ASSERT(IS_POWER_OF_TWO(kStackSize)); |
| static inline int OffsetForDepth(int depth); |
| |
| inline void PushLeft(ConsString* string); |
| inline void PushRight(ConsString* string); |
| inline void AdjustMaximumDepth(); |
| inline void Pop(); |
| inline bool StackBlown() { return maximum_depth_ - depth_ == kStackSize; } |
| void Initialize(ConsString* cons_string, int offset); |
| String* Continue(int* offset_out); |
| String* NextLeaf(bool* blew_stack); |
| String* Search(int* offset_out); |
| |
| // Stack must always contain only frames for which right traversal |
| // has not yet been performed. |
| ConsString* frames_[kStackSize]; |
| ConsString* root_; |
| int depth_; |
| int maximum_depth_; |
| int consumed_; |
| DISALLOW_COPY_AND_ASSIGN(ConsStringIterator); |
| }; |
| |
| |
| class StringCharacterStream { |
| public: |
| inline StringCharacterStream(String* string, |
| int offset = 0); |
| inline uint16_t GetNext(); |
| inline bool HasMore(); |
| inline void Reset(String* string, int offset = 0); |
| inline void VisitOneByteString(const uint8_t* chars, int length); |
| inline void VisitTwoByteString(const uint16_t* chars, int length); |
| |
| private: |
| ConsStringIterator iter_; |
| bool is_one_byte_; |
| union { |
| const uint8_t* buffer8_; |
| const uint16_t* buffer16_; |
| }; |
| const uint8_t* end_; |
| DISALLOW_COPY_AND_ASSIGN(StringCharacterStream); |
| }; |
| |
| |
| template <typename T> |
| class VectorIterator { |
| public: |
| VectorIterator(T* d, int l) : data_(Vector<const T>(d, l)), index_(0) { } |
| explicit VectorIterator(Vector<const T> data) : data_(data), index_(0) { } |
| T GetNext() { return data_[index_++]; } |
| bool has_more() { return index_ < data_.length(); } |
| private: |
| Vector<const T> data_; |
| int index_; |
| }; |
| |
| |
| // The Oddball describes objects null, undefined, true, and false. |
| class Oddball: public HeapObject { |
| public: |
| // [to_number_raw]: Cached raw to_number computed at startup. |
| inline double to_number_raw() const; |
| inline void set_to_number_raw(double value); |
| |
| // [to_string]: Cached to_string computed at startup. |
| DECL_ACCESSORS(to_string, String) |
| |
| // [to_number]: Cached to_number computed at startup. |
| DECL_ACCESSORS(to_number, Object) |
| |
| // [typeof]: Cached type_of computed at startup. |
| DECL_ACCESSORS(type_of, String) |
| |
| inline byte kind() const; |
| inline void set_kind(byte kind); |
| |
| // ES6 section 7.1.3 ToNumber for Boolean, Null, Undefined. |
| MUST_USE_RESULT static inline Handle<Object> ToNumber(Handle<Oddball> input); |
| |
| DECLARE_CAST(Oddball) |
| |
| // Dispatched behavior. |
| DECLARE_VERIFIER(Oddball) |
| |
| // Initialize the fields. |
| static void Initialize(Isolate* isolate, Handle<Oddball> oddball, |
| const char* to_string, Handle<Object> to_number, |
| const char* type_of, byte kind); |
| |
| // Layout description. |
| static const int kToNumberRawOffset = HeapObject::kHeaderSize; |
| static const int kToStringOffset = kToNumberRawOffset + kDoubleSize; |
| static const int kToNumberOffset = kToStringOffset + kPointerSize; |
| static const int kTypeOfOffset = kToNumberOffset + kPointerSize; |
| static const int kKindOffset = kTypeOfOffset + kPointerSize; |
| static const int kSize = kKindOffset + kPointerSize; |
| |
| static const byte kFalse = 0; |
| static const byte kTrue = 1; |
| static const byte kNotBooleanMask = ~1; |
| static const byte kTheHole = 2; |
| static const byte kNull = 3; |
| static const byte kArgumentsMarker = 4; |
| static const byte kUndefined = 5; |
| static const byte kUninitialized = 6; |
| static const byte kOther = 7; |
| static const byte kException = 8; |
| static const byte kOptimizedOut = 9; |
| static const byte kStaleRegister = 10; |
| |
| typedef FixedBodyDescriptor<kToStringOffset, kTypeOfOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| |
| STATIC_ASSERT(kToNumberRawOffset == HeapNumber::kValueOffset); |
| STATIC_ASSERT(kKindOffset == Internals::kOddballKindOffset); |
| STATIC_ASSERT(kNull == Internals::kNullOddballKind); |
| STATIC_ASSERT(kUndefined == Internals::kUndefinedOddballKind); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Oddball); |
| }; |
| |
| |
| class Cell: public HeapObject { |
| public: |
| // [value]: value of the cell. |
| DECL_ACCESSORS(value, Object) |
| |
| DECLARE_CAST(Cell) |
| |
| static inline Cell* FromValueAddress(Address value) { |
| Object* result = FromAddress(value - kValueOffset); |
| return static_cast<Cell*>(result); |
| } |
| |
| inline Address ValueAddress() { |
| return address() + kValueOffset; |
| } |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Cell) |
| DECLARE_VERIFIER(Cell) |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kSize = kValueOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kValueOffset, |
| kValueOffset + kPointerSize, |
| kSize> BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Cell); |
| }; |
| |
| |
| class PropertyCell : public HeapObject { |
| public: |
| // [property_details]: details of the global property. |
| DECL_ACCESSORS(property_details_raw, Object) |
| // [value]: value of the global property. |
| DECL_ACCESSORS(value, Object) |
| // [dependent_code]: dependent code that depends on the type of the global |
| // property. |
| DECL_ACCESSORS(dependent_code, DependentCode) |
| |
| inline PropertyDetails property_details(); |
| inline void set_property_details(PropertyDetails details); |
| |
| PropertyCellConstantType GetConstantType(); |
| |
| // Computes the new type of the cell's contents for the given value, but |
| // without actually modifying the details. |
| static PropertyCellType UpdatedType(Handle<PropertyCell> cell, |
| Handle<Object> value, |
| PropertyDetails details); |
| // Prepares property cell at given entry for receiving given value. |
| // As a result the old cell could be invalidated and/or dependent code could |
| // be deoptimized. Returns the prepared property cell. |
| static Handle<PropertyCell> PrepareForValue( |
| Handle<GlobalDictionary> dictionary, int entry, Handle<Object> value, |
| PropertyDetails details); |
| |
| static Handle<PropertyCell> InvalidateEntry( |
| Handle<GlobalDictionary> dictionary, int entry); |
| |
| static void SetValueWithInvalidation(Handle<PropertyCell> cell, |
| Handle<Object> new_value); |
| |
| DECLARE_CAST(PropertyCell) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(PropertyCell) |
| DECLARE_VERIFIER(PropertyCell) |
| |
| // Layout description. |
| static const int kDetailsOffset = HeapObject::kHeaderSize; |
| static const int kValueOffset = kDetailsOffset + kPointerSize; |
| static const int kDependentCodeOffset = kValueOffset + kPointerSize; |
| static const int kSize = kDependentCodeOffset + kPointerSize; |
| |
| static const int kPointerFieldsBeginOffset = kValueOffset; |
| static const int kPointerFieldsEndOffset = kSize; |
| |
| typedef FixedBodyDescriptor<kValueOffset, |
| kSize, |
| kSize> BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PropertyCell); |
| }; |
| |
| |
| class WeakCell : public HeapObject { |
| public: |
| inline Object* value() const; |
| |
| // This should not be called by anyone except GC. |
| inline void clear(); |
| |
| // This should not be called by anyone except allocator. |
| inline void initialize(HeapObject* value); |
| |
| inline bool cleared() const; |
| |
| DECL_ACCESSORS(next, Object) |
| |
| inline void clear_next(Object* the_hole_value); |
| |
| inline bool next_cleared(); |
| |
| DECLARE_CAST(WeakCell) |
| |
| DECLARE_PRINTER(WeakCell) |
| DECLARE_VERIFIER(WeakCell) |
| |
| // Layout description. |
| static const int kValueOffset = HeapObject::kHeaderSize; |
| static const int kNextOffset = kValueOffset + kPointerSize; |
| static const int kSize = kNextOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<kValueOffset, kSize, kSize> BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(WeakCell); |
| }; |
| |
| |
| // The JSProxy describes EcmaScript Harmony proxies |
| class JSProxy: public JSReceiver { |
| public: |
| MUST_USE_RESULT static MaybeHandle<JSProxy> New(Isolate* isolate, |
| Handle<Object>, |
| Handle<Object>); |
| |
| // [handler]: The handler property. |
| DECL_ACCESSORS(handler, Object) |
| // [target]: The target property. |
| DECL_ACCESSORS(target, JSReceiver) |
| // [hash]: The hash code property (undefined if not initialized yet). |
| DECL_ACCESSORS(hash, Object) |
| |
| static MaybeHandle<Context> GetFunctionRealm(Handle<JSProxy> proxy); |
| |
| DECLARE_CAST(JSProxy) |
| |
| INLINE(bool IsRevoked() const); |
| static void Revoke(Handle<JSProxy> proxy); |
| |
| // ES6 9.5.1 |
| static MaybeHandle<Object> GetPrototype(Handle<JSProxy> receiver); |
| |
| // ES6 9.5.2 |
| MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSProxy> proxy, |
| Handle<Object> value, |
| bool from_javascript, |
| ShouldThrow should_throw); |
| // ES6 9.5.3 |
| MUST_USE_RESULT static Maybe<bool> IsExtensible(Handle<JSProxy> proxy); |
| |
| // ES6 9.5.4 (when passed DONT_THROW) |
| MUST_USE_RESULT static Maybe<bool> PreventExtensions( |
| Handle<JSProxy> proxy, ShouldThrow should_throw); |
| |
| // ES6 9.5.5 |
| MUST_USE_RESULT static Maybe<bool> GetOwnPropertyDescriptor( |
| Isolate* isolate, Handle<JSProxy> proxy, Handle<Name> name, |
| PropertyDescriptor* desc); |
| |
| // ES6 9.5.6 |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSProxy> object, Handle<Object> key, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| // ES6 9.5.7 |
| MUST_USE_RESULT static Maybe<bool> HasProperty(Isolate* isolate, |
| Handle<JSProxy> proxy, |
| Handle<Name> name); |
| |
| // ES6 9.5.8 |
| MUST_USE_RESULT static MaybeHandle<Object> GetProperty( |
| Isolate* isolate, Handle<JSProxy> proxy, Handle<Name> name, |
| Handle<Object> receiver, bool* was_found); |
| |
| // ES6 9.5.9 |
| MUST_USE_RESULT static Maybe<bool> SetProperty(Handle<JSProxy> proxy, |
| Handle<Name> name, |
| Handle<Object> value, |
| Handle<Object> receiver, |
| LanguageMode language_mode); |
| |
| // ES6 9.5.10 (when passed SLOPPY) |
| MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement( |
| Handle<JSProxy> proxy, Handle<Name> name, LanguageMode language_mode); |
| |
| // ES6 9.5.12 |
| MUST_USE_RESULT static Maybe<bool> OwnPropertyKeys( |
| Isolate* isolate, Handle<JSReceiver> receiver, Handle<JSProxy> proxy, |
| PropertyFilter filter, KeyAccumulator* accumulator); |
| |
| MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes( |
| LookupIterator* it); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSProxy) |
| DECLARE_VERIFIER(JSProxy) |
| |
| // Layout description. |
| static const int kTargetOffset = JSReceiver::kHeaderSize; |
| static const int kHandlerOffset = kTargetOffset + kPointerSize; |
| static const int kHashOffset = kHandlerOffset + kPointerSize; |
| static const int kSize = kHashOffset + kPointerSize; |
| |
| typedef FixedBodyDescriptor<JSReceiver::kPropertiesOffset, kSize, kSize> |
| BodyDescriptor; |
| |
| static Object* GetIdentityHash(Handle<JSProxy> receiver); |
| |
| static Smi* GetOrCreateIdentityHash(Isolate* isolate, Handle<JSProxy> proxy); |
| |
| static Maybe<bool> SetPrivateProperty(Isolate* isolate, Handle<JSProxy> proxy, |
| Handle<Symbol> private_name, |
| PropertyDescriptor* desc, |
| ShouldThrow should_throw); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSProxy); |
| }; |
| |
| |
| class JSCollection : public JSObject { |
| public: |
| // [table]: the backing hash table |
| DECL_ACCESSORS(table, Object) |
| |
| static const int kTableOffset = JSObject::kHeaderSize; |
| static const int kSize = kTableOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSCollection); |
| }; |
| |
| |
| // The JSSet describes EcmaScript Harmony sets |
| class JSSet : public JSCollection { |
| public: |
| DECLARE_CAST(JSSet) |
| |
| static void Initialize(Handle<JSSet> set, Isolate* isolate); |
| static void Clear(Handle<JSSet> set); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSSet) |
| DECLARE_VERIFIER(JSSet) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSSet); |
| }; |
| |
| |
| // The JSMap describes EcmaScript Harmony maps |
| class JSMap : public JSCollection { |
| public: |
| DECLARE_CAST(JSMap) |
| |
| static void Initialize(Handle<JSMap> map, Isolate* isolate); |
| static void Clear(Handle<JSMap> map); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSMap) |
| DECLARE_VERIFIER(JSMap) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSMap); |
| }; |
| |
| |
| // OrderedHashTableIterator is an iterator that iterates over the keys and |
| // values of an OrderedHashTable. |
| // |
| // The iterator has a reference to the underlying OrderedHashTable data, |
| // [table], as well as the current [index] the iterator is at. |
| // |
| // When the OrderedHashTable is rehashed it adds a reference from the old table |
| // to the new table as well as storing enough data about the changes so that the |
| // iterator [index] can be adjusted accordingly. |
| // |
| // When the [Next] result from the iterator is requested, the iterator checks if |
| // there is a newer table that it needs to transition to. |
| template<class Derived, class TableType> |
| class OrderedHashTableIterator: public JSObject { |
| public: |
| // [table]: the backing hash table mapping keys to values. |
| DECL_ACCESSORS(table, Object) |
| |
| // [index]: The index into the data table. |
| DECL_ACCESSORS(index, Object) |
| |
| // [kind]: The kind of iteration this is. One of the [Kind] enum values. |
| DECL_ACCESSORS(kind, Object) |
| |
| #ifdef OBJECT_PRINT |
| void OrderedHashTableIteratorPrint(std::ostream& os); // NOLINT |
| #endif |
| |
| static const int kTableOffset = JSObject::kHeaderSize; |
| static const int kIndexOffset = kTableOffset + kPointerSize; |
| static const int kKindOffset = kIndexOffset + kPointerSize; |
| static const int kSize = kKindOffset + kPointerSize; |
| |
| enum Kind { |
| kKindKeys = 1, |
| kKindValues = 2, |
| kKindEntries = 3 |
| }; |
| |
| // Whether the iterator has more elements. This needs to be called before |
| // calling |CurrentKey| and/or |CurrentValue|. |
| bool HasMore(); |
| |
| // Move the index forward one. |
| void MoveNext() { |
| set_index(Smi::FromInt(Smi::cast(index())->value() + 1)); |
| } |
| |
| // Populates the array with the next key and value and then moves the iterator |
| // forward. |
| // This returns the |kind| or 0 if the iterator is already at the end. |
| Smi* Next(JSArray* value_array); |
| |
| // Returns the current key of the iterator. This should only be called when |
| // |HasMore| returns true. |
| inline Object* CurrentKey(); |
| |
| private: |
| // Transitions the iterator to the non obsolete backing store. This is a NOP |
| // if the [table] is not obsolete. |
| void Transition(); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(OrderedHashTableIterator); |
| }; |
| |
| |
| class JSSetIterator: public OrderedHashTableIterator<JSSetIterator, |
| OrderedHashSet> { |
| public: |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSSetIterator) |
| DECLARE_VERIFIER(JSSetIterator) |
| |
| DECLARE_CAST(JSSetIterator) |
| |
| // Called by |Next| to populate the array. This allows the subclasses to |
| // populate the array differently. |
| inline void PopulateValueArray(FixedArray* array); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSSetIterator); |
| }; |
| |
| |
| class JSMapIterator: public OrderedHashTableIterator<JSMapIterator, |
| OrderedHashMap> { |
| public: |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSMapIterator) |
| DECLARE_VERIFIER(JSMapIterator) |
| |
| DECLARE_CAST(JSMapIterator) |
| |
| // Called by |Next| to populate the array. This allows the subclasses to |
| // populate the array differently. |
| inline void PopulateValueArray(FixedArray* array); |
| |
| private: |
| // Returns the current value of the iterator. This should only be called when |
| // |HasMore| returns true. |
| inline Object* CurrentValue(); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSMapIterator); |
| }; |
| |
| |
| // Base class for both JSWeakMap and JSWeakSet |
| class JSWeakCollection: public JSObject { |
| public: |
| DECLARE_CAST(JSWeakCollection) |
| |
| // [table]: the backing hash table mapping keys to values. |
| DECL_ACCESSORS(table, Object) |
| |
| // [next]: linked list of encountered weak maps during GC. |
| DECL_ACCESSORS(next, Object) |
| |
| static void Initialize(Handle<JSWeakCollection> collection, Isolate* isolate); |
| static void Set(Handle<JSWeakCollection> collection, Handle<Object> key, |
| Handle<Object> value, int32_t hash); |
| static bool Delete(Handle<JSWeakCollection> collection, Handle<Object> key, |
| int32_t hash); |
| |
| static const int kTableOffset = JSObject::kHeaderSize; |
| static const int kNextOffset = kTableOffset + kPointerSize; |
| static const int kSize = kNextOffset + kPointerSize; |
| |
| // Visiting policy defines whether the table and next collection fields |
| // should be visited or not. |
| enum BodyVisitingPolicy { kVisitStrong, kVisitWeak }; |
| |
| // Iterates the function object according to the visiting policy. |
| template <BodyVisitingPolicy> |
| class BodyDescriptorImpl; |
| |
| // Visit the whole object. |
| typedef BodyDescriptorImpl<kVisitStrong> BodyDescriptor; |
| |
| // Don't visit table and next collection fields. |
| typedef BodyDescriptorImpl<kVisitWeak> BodyDescriptorWeak; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakCollection); |
| }; |
| |
| |
| // The JSWeakMap describes EcmaScript Harmony weak maps |
| class JSWeakMap: public JSWeakCollection { |
| public: |
| DECLARE_CAST(JSWeakMap) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSWeakMap) |
| DECLARE_VERIFIER(JSWeakMap) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakMap); |
| }; |
| |
| |
| // The JSWeakSet describes EcmaScript Harmony weak sets |
| class JSWeakSet: public JSWeakCollection { |
| public: |
| DECLARE_CAST(JSWeakSet) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSWeakSet) |
| DECLARE_VERIFIER(JSWeakSet) |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSWeakSet); |
| }; |
| |
| |
| // Whether a JSArrayBuffer is a SharedArrayBuffer or not. |
| enum class SharedFlag { kNotShared, kShared }; |
| |
| |
| class JSArrayBuffer: public JSObject { |
| public: |
| // [backing_store]: backing memory for this array |
| DECL_ACCESSORS(backing_store, void) |
| |
| // [byte_length]: length in bytes |
| DECL_ACCESSORS(byte_length, Object) |
| |
| inline uint32_t bit_field() const; |
| inline void set_bit_field(uint32_t bits); |
| |
| inline bool is_external(); |
| inline void set_is_external(bool value); |
| |
| inline bool is_neuterable(); |
| inline void set_is_neuterable(bool value); |
| |
| inline bool was_neutered(); |
| inline void set_was_neutered(bool value); |
| |
| inline bool is_shared(); |
| inline void set_is_shared(bool value); |
| |
| DECLARE_CAST(JSArrayBuffer) |
| |
| void Neuter(); |
| |
| static void Setup(Handle<JSArrayBuffer> array_buffer, Isolate* isolate, |
| bool is_external, void* data, size_t allocated_length, |
| SharedFlag shared = SharedFlag::kNotShared); |
| |
| static bool SetupAllocatingData(Handle<JSArrayBuffer> array_buffer, |
| Isolate* isolate, size_t allocated_length, |
| bool initialize = true, |
| SharedFlag shared = SharedFlag::kNotShared); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSArrayBuffer) |
| DECLARE_VERIFIER(JSArrayBuffer) |
| |
| static const int kByteLengthOffset = JSObject::kHeaderSize; |
| static const int kBackingStoreOffset = kByteLengthOffset + kPointerSize; |
| static const int kBitFieldSlot = kBackingStoreOffset + kPointerSize; |
| #if V8_TARGET_LITTLE_ENDIAN || !V8_HOST_ARCH_64_BIT |
| static const int kBitFieldOffset = kBitFieldSlot; |
| #else |
| static const int kBitFieldOffset = kBitFieldSlot + kIntSize; |
| #endif |
| static const int kSize = kBitFieldSlot + kPointerSize; |
| |
| static const int kSizeWithInternalFields = |
| kSize + v8::ArrayBuffer::kInternalFieldCount * kPointerSize; |
| |
| // Iterates all fields in the object including internal ones except |
| // kBackingStoreOffset and kBitFieldSlot. |
| class BodyDescriptor; |
| |
| class IsExternal : public BitField<bool, 1, 1> {}; |
| class IsNeuterable : public BitField<bool, 2, 1> {}; |
| class WasNeutered : public BitField<bool, 3, 1> {}; |
| class IsShared : public BitField<bool, 4, 1> {}; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBuffer); |
| }; |
| |
| |
| class JSArrayBufferView: public JSObject { |
| public: |
| // [buffer]: ArrayBuffer that this typed array views. |
| DECL_ACCESSORS(buffer, Object) |
| |
| // [byte_offset]: offset of typed array in bytes. |
| DECL_ACCESSORS(byte_offset, Object) |
| |
| // [byte_length]: length of typed array in bytes. |
| DECL_ACCESSORS(byte_length, Object) |
| |
| DECLARE_CAST(JSArrayBufferView) |
| |
| DECLARE_VERIFIER(JSArrayBufferView) |
| |
| inline bool WasNeutered() const; |
| |
| static const int kBufferOffset = JSObject::kHeaderSize; |
| static const int kByteOffsetOffset = kBufferOffset + kPointerSize; |
| static const int kByteLengthOffset = kByteOffsetOffset + kPointerSize; |
| static const int kViewSize = kByteLengthOffset + kPointerSize; |
| |
| private: |
| #ifdef VERIFY_HEAP |
| DECL_ACCESSORS(raw_byte_offset, Object) |
| DECL_ACCESSORS(raw_byte_length, Object) |
| #endif |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBufferView); |
| }; |
| |
| |
| class JSTypedArray: public JSArrayBufferView { |
| public: |
| // [length]: length of typed array in elements. |
| DECL_ACCESSORS(length, Object) |
| inline uint32_t length_value() const; |
| |
| DECLARE_CAST(JSTypedArray) |
| |
| ExternalArrayType type(); |
| size_t element_size(); |
| |
| Handle<JSArrayBuffer> GetBuffer(); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSTypedArray) |
| DECLARE_VERIFIER(JSTypedArray) |
| |
| static const int kLengthOffset = kViewSize + kPointerSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| static const int kSizeWithInternalFields = |
| kSize + v8::ArrayBufferView::kInternalFieldCount * kPointerSize; |
| |
| private: |
| static Handle<JSArrayBuffer> MaterializeArrayBuffer( |
| Handle<JSTypedArray> typed_array); |
| #ifdef VERIFY_HEAP |
| DECL_ACCESSORS(raw_length, Object) |
| #endif |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSTypedArray); |
| }; |
| |
| |
| class JSDataView: public JSArrayBufferView { |
| public: |
| DECLARE_CAST(JSDataView) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSDataView) |
| DECLARE_VERIFIER(JSDataView) |
| |
| static const int kSize = kViewSize; |
| |
| static const int kSizeWithInternalFields = |
| kSize + v8::ArrayBufferView::kInternalFieldCount * kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSDataView); |
| }; |
| |
| |
| // Foreign describes objects pointing from JavaScript to C structures. |
| class Foreign: public HeapObject { |
| public: |
| // [address]: field containing the address. |
| inline Address foreign_address(); |
| inline void set_foreign_address(Address value); |
| |
| DECLARE_CAST(Foreign) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(Foreign) |
| DECLARE_VERIFIER(Foreign) |
| |
| // Layout description. |
| |
| static const int kForeignAddressOffset = HeapObject::kHeaderSize; |
| static const int kSize = kForeignAddressOffset + kPointerSize; |
| |
| STATIC_ASSERT(kForeignAddressOffset == Internals::kForeignAddressOffset); |
| |
| class BodyDescriptor; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(Foreign); |
| }; |
| |
| |
| // The JSArray describes JavaScript Arrays |
| // Such an array can be in one of two modes: |
| // - fast, backing storage is a FixedArray and length <= elements.length(); |
| // Please note: push and pop can be used to grow and shrink the array. |
| // - slow, backing storage is a HashTable with numbers as keys. |
| class JSArray: public JSObject { |
| public: |
| // [length]: The length property. |
| DECL_ACCESSORS(length, Object) |
| |
| // Overload the length setter to skip write barrier when the length |
| // is set to a smi. This matches the set function on FixedArray. |
| inline void set_length(Smi* length); |
| |
| static bool HasReadOnlyLength(Handle<JSArray> array); |
| static bool WouldChangeReadOnlyLength(Handle<JSArray> array, uint32_t index); |
| |
| // Initialize the array with the given capacity. The function may |
| // fail due to out-of-memory situations, but only if the requested |
| // capacity is non-zero. |
| static void Initialize(Handle<JSArray> array, int capacity, int length = 0); |
| |
| // If the JSArray has fast elements, and new_length would result in |
| // normalization, returns true. |
| bool SetLengthWouldNormalize(uint32_t new_length); |
| static inline bool SetLengthWouldNormalize(Heap* heap, uint32_t new_length); |
| |
| // Initializes the array to a certain length. |
| inline bool AllowsSetLength(); |
| |
| static void SetLength(Handle<JSArray> array, uint32_t length); |
| |
| // Set the content of the array to the content of storage. |
| static inline void SetContent(Handle<JSArray> array, |
| Handle<FixedArrayBase> storage); |
| |
| // ES6 9.4.2.1 |
| MUST_USE_RESULT static Maybe<bool> DefineOwnProperty( |
| Isolate* isolate, Handle<JSArray> o, Handle<Object> name, |
| PropertyDescriptor* desc, ShouldThrow should_throw); |
| |
| static bool AnythingToArrayLength(Isolate* isolate, |
| Handle<Object> length_object, |
| uint32_t* output); |
| MUST_USE_RESULT static Maybe<bool> ArraySetLength(Isolate* isolate, |
| Handle<JSArray> a, |
| PropertyDescriptor* desc, |
| ShouldThrow should_throw); |
| |
| // Checks whether the Array has the current realm's Array.prototype as its |
| // prototype. This function is best-effort and only gives a conservative |
| // approximation, erring on the side of false, in particular with respect |
| // to Proxies and objects with a hidden prototype. |
| inline bool HasArrayPrototype(Isolate* isolate); |
| |
| DECLARE_CAST(JSArray) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(JSArray) |
| DECLARE_VERIFIER(JSArray) |
| |
| // Number of element slots to pre-allocate for an empty array. |
| static const int kPreallocatedArrayElements = 4; |
| |
| // Layout description. |
| static const int kLengthOffset = JSObject::kHeaderSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| // 600 * KB is the Page::kMaxRegularHeapObjectSize defined in spaces.h which |
| // we do not want to include in objects.h |
| // Note that Page::kMaxRegularHeapObjectSize has to be in sync with |
| // kInitialMaxFastElementArray which is checked in a DCHECK in heap.cc. |
| static const int kInitialMaxFastElementArray = |
| (600 * KB - FixedArray::kHeaderSize - kSize - AllocationMemento::kSize) / |
| kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSArray); |
| }; |
| |
| |
| Handle<Object> CacheInitialJSArrayMaps(Handle<Context> native_context, |
| Handle<Map> initial_map); |
| |
| |
| // JSRegExpResult is just a JSArray with a specific initial map. |
| // This initial map adds in-object properties for "index" and "input" |
| // properties, as assigned by RegExp.prototype.exec, which allows |
| // faster creation of RegExp exec results. |
| // This class just holds constants used when creating the result. |
| // After creation the result must be treated as a JSArray in all regards. |
| class JSRegExpResult: public JSArray { |
| public: |
| // Offsets of object fields. |
| static const int kIndexOffset = JSArray::kSize; |
| static const int kInputOffset = kIndexOffset + kPointerSize; |
| static const int kSize = kInputOffset + kPointerSize; |
| // Indices of in-object properties. |
| static const int kIndexIndex = 0; |
| static const int kInputIndex = 1; |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(JSRegExpResult); |
| }; |
| |
| |
| // An accessor must have a getter, but can have no setter. |
| // |
| // When setting a property, V8 searches accessors in prototypes. |
| // If an accessor was found and it does not have a setter, |
| // the request is ignored. |
| // |
| // If the accessor in the prototype has the READ_ONLY property attribute, then |
| // a new value is added to the derived object when the property is set. |
| // This shadows the accessor in the prototype. |
| class AccessorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(name, Object) |
| DECL_INT_ACCESSORS(flag) |
| DECL_ACCESSORS(expected_receiver_type, Object) |
| // This directly points at a foreign C function to be used from the runtime. |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| // This either points at the same as above, or a trampoline in case we are |
| // running with the simulator. Use these entries from generated code. |
| DECL_ACCESSORS(js_getter, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| static Address redirect(Isolate* isolate, Address address, |
| AccessorComponent component); |
| Address redirected_getter() const; |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(AccessorInfo) |
| |
| inline bool all_can_read(); |
| inline void set_all_can_read(bool value); |
| |
| inline bool all_can_write(); |
| inline void set_all_can_write(bool value); |
| |
| inline bool is_special_data_property(); |
| inline void set_is_special_data_property(bool value); |
| |
| inline bool is_sloppy(); |
| inline void set_is_sloppy(bool value); |
| |
| inline PropertyAttributes property_attributes(); |
| inline void set_property_attributes(PropertyAttributes attributes); |
| |
| // Checks whether the given receiver is compatible with this accessor. |
| static bool IsCompatibleReceiverMap(Isolate* isolate, |
| Handle<AccessorInfo> info, |
| Handle<Map> map); |
| inline bool IsCompatibleReceiver(Object* receiver); |
| |
| DECLARE_CAST(AccessorInfo) |
| |
| // Dispatched behavior. |
| DECLARE_VERIFIER(AccessorInfo) |
| |
| // Append all descriptors to the array that are not already there. |
| // Return number added. |
| static int AppendUnique(Handle<Object> descriptors, |
| Handle<FixedArray> array, |
| int valid_descriptors); |
| |
| static const int kNameOffset = HeapObject::kHeaderSize; |
| static const int kFlagOffset = kNameOffset + kPointerSize; |
| static const int kExpectedReceiverTypeOffset = kFlagOffset + kPointerSize; |
| static const int kSetterOffset = kExpectedReceiverTypeOffset + kPointerSize; |
| static const int kGetterOffset = kSetterOffset + kPointerSize; |
| static const int kJsGetterOffset = kGetterOffset + kPointerSize; |
| static const int kDataOffset = kJsGetterOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| |
| private: |
| inline bool HasExpectedReceiverType(); |
| |
| // Bit positions in flag. |
| static const int kAllCanReadBit = 0; |
| static const int kAllCanWriteBit = 1; |
| static const int kSpecialDataProperty = 2; |
| static const int kIsSloppy = 3; |
| class AttributesField : public BitField<PropertyAttributes, 4, 3> {}; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo); |
| }; |
| |
| |
| // Support for JavaScript accessors: A pair of a getter and a setter. Each |
| // accessor can either be |
| // * a pointer to a JavaScript function or proxy: a real accessor |
| // * undefined: considered an accessor by the spec, too, strangely enough |
| // * the hole: an accessor which has not been set |
| // * a pointer to a map: a transition used to ensure map sharing |
| class AccessorPair: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| |
| DECLARE_CAST(AccessorPair) |
| |
| static Handle<AccessorPair> Copy(Handle<AccessorPair> pair); |
| |
| inline Object* get(AccessorComponent component); |
| inline void set(AccessorComponent component, Object* value); |
| |
| // Note: Returns undefined instead in case of a hole. |
| static Handle<Object> GetComponent(Handle<AccessorPair> accessor_pair, |
| AccessorComponent component); |
| |
| // Set both components, skipping arguments which are a JavaScript null. |
| inline void SetComponents(Object* getter, Object* setter); |
| |
| inline bool Equals(AccessorPair* pair); |
| inline bool Equals(Object* getter_value, Object* setter_value); |
| |
| inline bool ContainsAccessor(); |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(AccessorPair) |
| DECLARE_VERIFIER(AccessorPair) |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kSize = kSetterOffset + kPointerSize; |
| |
| private: |
| // Strangely enough, in addition to functions and harmony proxies, the spec |
| // requires us to consider undefined as a kind of accessor, too: |
| // var obj = {}; |
| // Object.defineProperty(obj, "foo", {get: undefined}); |
| // assertTrue("foo" in obj); |
| inline bool IsJSAccessor(Object* obj); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorPair); |
| }; |
| |
| |
| class AccessCheckInfo: public Struct { |
| public: |
| DECL_ACCESSORS(callback, Object) |
| DECL_ACCESSORS(named_interceptor, Object) |
| DECL_ACCESSORS(indexed_interceptor, Object) |
| DECL_ACCESSORS(data, Object) |
| |
| DECLARE_CAST(AccessCheckInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(AccessCheckInfo) |
| DECLARE_VERIFIER(AccessCheckInfo) |
| |
| static AccessCheckInfo* Get(Isolate* isolate, Handle<JSObject> receiver); |
| |
| static const int kCallbackOffset = HeapObject::kHeaderSize; |
| static const int kNamedInterceptorOffset = kCallbackOffset + kPointerSize; |
| static const int kIndexedInterceptorOffset = |
| kNamedInterceptorOffset + kPointerSize; |
| static const int kDataOffset = kIndexedInterceptorOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(AccessCheckInfo); |
| }; |
| |
| |
| class InterceptorInfo: public Struct { |
| public: |
| DECL_ACCESSORS(getter, Object) |
| DECL_ACCESSORS(setter, Object) |
| DECL_ACCESSORS(query, Object) |
| DECL_ACCESSORS(deleter, Object) |
| DECL_ACCESSORS(enumerator, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_BOOLEAN_ACCESSORS(can_intercept_symbols) |
| DECL_BOOLEAN_ACCESSORS(all_can_read) |
| DECL_BOOLEAN_ACCESSORS(non_masking) |
| |
| inline int flags() const; |
| inline void set_flags(int flags); |
| |
| DECLARE_CAST(InterceptorInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(InterceptorInfo) |
| DECLARE_VERIFIER(InterceptorInfo) |
| |
| static const int kGetterOffset = HeapObject::kHeaderSize; |
| static const int kSetterOffset = kGetterOffset + kPointerSize; |
| static const int kQueryOffset = kSetterOffset + kPointerSize; |
| static const int kDeleterOffset = kQueryOffset + kPointerSize; |
| static const int kEnumeratorOffset = kDeleterOffset + kPointerSize; |
| static const int kDataOffset = kEnumeratorOffset + kPointerSize; |
| static const int kFlagsOffset = kDataOffset + kPointerSize; |
| static const int kSize = kFlagsOffset + kPointerSize; |
| |
| static const int kCanInterceptSymbolsBit = 0; |
| static const int kAllCanReadBit = 1; |
| static const int kNonMasking = 2; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptorInfo); |
| }; |
| |
| |
| class CallHandlerInfo: public Struct { |
| public: |
| DECL_ACCESSORS(callback, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_ACCESSORS(fast_handler, Object) |
| |
| DECLARE_CAST(CallHandlerInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(CallHandlerInfo) |
| DECLARE_VERIFIER(CallHandlerInfo) |
| |
| static const int kCallbackOffset = HeapObject::kHeaderSize; |
| static const int kDataOffset = kCallbackOffset + kPointerSize; |
| static const int kFastHandlerOffset = kDataOffset + kPointerSize; |
| static const int kSize = kFastHandlerOffset + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(CallHandlerInfo); |
| }; |
| |
| |
| class TemplateInfo: public Struct { |
| public: |
| DECL_ACCESSORS(tag, Object) |
| DECL_ACCESSORS(serial_number, Object) |
| DECL_INT_ACCESSORS(number_of_properties) |
| DECL_ACCESSORS(property_list, Object) |
| DECL_ACCESSORS(property_accessors, Object) |
| |
| DECLARE_VERIFIER(TemplateInfo) |
| |
| DECLARE_CAST(TemplateInfo) |
| |
| static const int kTagOffset = HeapObject::kHeaderSize; |
| static const int kSerialNumberOffset = kTagOffset + kPointerSize; |
| static const int kNumberOfProperties = kSerialNumberOffset + kPointerSize; |
| static const int kPropertyListOffset = kNumberOfProperties + kPointerSize; |
| static const int kPropertyAccessorsOffset = |
| kPropertyListOffset + kPointerSize; |
| static const int kPropertyIntrinsicsOffset = |
| kPropertyAccessorsOffset + kPointerSize; |
| static const int kHeaderSize = kPropertyIntrinsicsOffset + kPointerSize; |
| |
| static const int kFastTemplateInstantiationsCacheSize = 1 * KB; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(TemplateInfo); |
| }; |
| |
| |
| class FunctionTemplateInfo: public TemplateInfo { |
| public: |
| DECL_ACCESSORS(call_code, Object) |
| DECL_ACCESSORS(prototype_template, Object) |
| DECL_ACCESSORS(parent_template, Object) |
| DECL_ACCESSORS(named_property_handler, Object) |
| DECL_ACCESSORS(indexed_property_handler, Object) |
| DECL_ACCESSORS(instance_template, Object) |
| DECL_ACCESSORS(class_name, Object) |
| DECL_ACCESSORS(signature, Object) |
| DECL_ACCESSORS(instance_call_handler, Object) |
| DECL_ACCESSORS(access_check_info, Object) |
| DECL_ACCESSORS(shared_function_info, Object) |
| DECL_ACCESSORS(js_function, Object) |
| DECL_INT_ACCESSORS(flag) |
| |
| inline int length() const; |
| inline void set_length(int value); |
| |
| // Following properties use flag bits. |
| DECL_BOOLEAN_ACCESSORS(hidden_prototype) |
| DECL_BOOLEAN_ACCESSORS(undetectable) |
| // If the bit is set, object instances created by this function |
| // requires access check. |
| DECL_BOOLEAN_ACCESSORS(needs_access_check) |
| DECL_BOOLEAN_ACCESSORS(read_only_prototype) |
| DECL_BOOLEAN_ACCESSORS(remove_prototype) |
| DECL_BOOLEAN_ACCESSORS(do_not_cache) |
| DECL_BOOLEAN_ACCESSORS(accept_any_receiver) |
| |
| DECLARE_CAST(FunctionTemplateInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(FunctionTemplateInfo) |
| DECLARE_VERIFIER(FunctionTemplateInfo) |
| |
| static const int kCallCodeOffset = TemplateInfo::kHeaderSize; |
| static const int kPrototypeTemplateOffset = |
| kCallCodeOffset + kPointerSize; |
| static const int kParentTemplateOffset = |
| kPrototypeTemplateOffset + kPointerSize; |
| static const int kNamedPropertyHandlerOffset = |
| kParentTemplateOffset + kPointerSize; |
| static const int kIndexedPropertyHandlerOffset = |
| kNamedPropertyHandlerOffset + kPointerSize; |
| static const int kInstanceTemplateOffset = |
| kIndexedPropertyHandlerOffset + kPointerSize; |
| static const int kClassNameOffset = kInstanceTemplateOffset + kPointerSize; |
| static const int kSignatureOffset = kClassNameOffset + kPointerSize; |
| static const int kInstanceCallHandlerOffset = kSignatureOffset + kPointerSize; |
| static const int kAccessCheckInfoOffset = |
| kInstanceCallHandlerOffset + kPointerSize; |
| static const int kSharedFunctionInfoOffset = |
| kAccessCheckInfoOffset + kPointerSize; |
| static const int kFlagOffset = kSharedFunctionInfoOffset + kPointerSize; |
| static const int kLengthOffset = kFlagOffset + kPointerSize; |
| static const int kSize = kLengthOffset + kPointerSize; |
| |
| static Handle<SharedFunctionInfo> GetOrCreateSharedFunctionInfo( |
| Isolate* isolate, Handle<FunctionTemplateInfo> info); |
| // Returns parent function template or null. |
| inline FunctionTemplateInfo* GetParent(Isolate* isolate); |
| // Returns true if |object| is an instance of this function template. |
| inline bool IsTemplateFor(JSObject* object); |
| bool IsTemplateFor(Map* map); |
| inline bool instantiated(); |
| |
| private: |
| // Bit position in the flag, from least significant bit position. |
| static const int kHiddenPrototypeBit = 0; |
| static const int kUndetectableBit = 1; |
| static const int kNeedsAccessCheckBit = 2; |
| static const int kReadOnlyPrototypeBit = 3; |
| static const int kRemovePrototypeBit = 4; |
| static const int kDoNotCacheBit = 5; |
| static const int kAcceptAnyReceiver = 6; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(FunctionTemplateInfo); |
| }; |
| |
| |
| class ObjectTemplateInfo: public TemplateInfo { |
| public: |
| DECL_ACCESSORS(constructor, Object) |
| DECL_ACCESSORS(data, Object) |
| DECL_INT_ACCESSORS(internal_field_count) |
| DECL_BOOLEAN_ACCESSORS(immutable_proto) |
| |
| DECLARE_CAST(ObjectTemplateInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(ObjectTemplateInfo) |
| DECLARE_VERIFIER(ObjectTemplateInfo) |
| |
| static const int kConstructorOffset = TemplateInfo::kHeaderSize; |
| // LSB is for immutable_proto, higher bits for internal_field_count |
| static const int kDataOffset = kConstructorOffset + kPointerSize; |
| static const int kSize = kDataOffset + kPointerSize; |
| |
| // Starting from given object template's constructor walk up the inheritance |
| // chain till a function template that has an instance template is found. |
| inline ObjectTemplateInfo* GetParent(Isolate* isolate); |
| |
| private: |
| class IsImmutablePrototype : public BitField<bool, 0, 1> {}; |
| class InternalFieldCount |
| : public BitField<int, IsImmutablePrototype::kNext, 29> {}; |
| }; |
| |
| |
| // The DebugInfo class holds additional information for a function being |
| // debugged. |
| class DebugInfo: public Struct { |
| public: |
| // The shared function info for the source being debugged. |
| DECL_ACCESSORS(shared, SharedFunctionInfo) |
| |
| DECL_ACCESSORS(debug_bytecode_array, Object) |
| // Fixed array holding status information for each active break point. |
| DECL_ACCESSORS(break_points, FixedArray) |
| |
| // Check if there is a break point at a source position. |
| bool HasBreakPoint(int source_position); |
| // Attempt to clear a break point. Return true if successful. |
| static bool ClearBreakPoint(Handle<DebugInfo> debug_info, |
| Handle<Object> break_point_object); |
| // Set a break point. |
| static void SetBreakPoint(Handle<DebugInfo> debug_info, int source_position, |
| Handle<Object> break_point_object); |
| // Get the break point objects for a source position. |
| Handle<Object> GetBreakPointObjects(int source_position); |
| // Find the break point info holding this break point object. |
| static Handle<Object> FindBreakPointInfo(Handle<DebugInfo> debug_info, |
| Handle<Object> break_point_object); |
| // Get the number of break points for this function. |
| int GetBreakPointCount(); |
| |
| static Smi* uninitialized() { return Smi::FromInt(0); } |
| |
| inline bool HasDebugBytecodeArray(); |
| inline bool HasDebugCode(); |
| |
| inline BytecodeArray* OriginalBytecodeArray(); |
| inline BytecodeArray* DebugBytecodeArray(); |
| inline Code* DebugCode(); |
| |
| DECLARE_CAST(DebugInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(DebugInfo) |
| DECLARE_VERIFIER(DebugInfo) |
| |
| static const int kSharedFunctionInfoIndex = Struct::kHeaderSize; |
| static const int kDebugBytecodeArrayIndex = |
| kSharedFunctionInfoIndex + kPointerSize; |
| static const int kBreakPointsStateIndex = |
| kDebugBytecodeArrayIndex + kPointerSize; |
| static const int kSize = kBreakPointsStateIndex + kPointerSize; |
| |
| static const int kEstimatedNofBreakPointsInFunction = 4; |
| |
| private: |
| // Get the break point info object for a source position. |
| Object* GetBreakPointInfo(int source_position); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(DebugInfo); |
| }; |
| |
| |
| // The BreakPointInfo class holds information for break points set in a |
| // function. The DebugInfo object holds a BreakPointInfo object for each code |
| // position with one or more break points. |
| class BreakPointInfo: public Struct { |
| public: |
| // The position in the source for the break position. |
| DECL_INT_ACCESSORS(source_position) |
| // List of related JavaScript break points. |
| DECL_ACCESSORS(break_point_objects, Object) |
| |
| // Removes a break point. |
| static void ClearBreakPoint(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Set a break point. |
| static void SetBreakPoint(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Check if break point info has this break point object. |
| static bool HasBreakPointObject(Handle<BreakPointInfo> info, |
| Handle<Object> break_point_object); |
| // Get the number of break points for this code offset. |
| int GetBreakPointCount(); |
| |
| int GetStatementPosition(Handle<DebugInfo> debug_info); |
| |
| DECLARE_CAST(BreakPointInfo) |
| |
| // Dispatched behavior. |
| DECLARE_PRINTER(BreakPointInfo) |
| DECLARE_VERIFIER(BreakPointInfo) |
| |
| static const int kSourcePositionIndex = Struct::kHeaderSize; |
| static const int kBreakPointObjectsIndex = |
| kSourcePositionIndex + kPointerSize; |
| static const int kSize = kBreakPointObjectsIndex + kPointerSize; |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BreakPointInfo); |
| }; |
| |
| |
| #undef DECL_BOOLEAN_ACCESSORS |
| #undef DECL_ACCESSORS |
| #undef DECLARE_CAST |
| #undef DECLARE_VERIFIER |
| |
| #define VISITOR_SYNCHRONIZATION_TAGS_LIST(V) \ |
| V(kStringTable, "string_table", "(Internalized strings)") \ |
| V(kExternalStringsTable, "external_strings_table", "(External strings)") \ |
| V(kStrongRootList, "strong_root_list", "(Strong roots)") \ |
| V(kSmiRootList, "smi_root_list", "(Smi roots)") \ |
| V(kBootstrapper, "bootstrapper", "(Bootstrapper)") \ |
| V(kTop, "top", "(Isolate)") \ |
| V(kRelocatable, "relocatable", "(Relocatable)") \ |
| V(kDebug, "debug", "(Debugger)") \ |
| V(kCompilationCache, "compilationcache", "(Compilation cache)") \ |
| V(kHandleScope, "handlescope", "(Handle scope)") \ |
| V(kDispatchTable, "dispatchtable", "(Dispatch table)") \ |
| V(kBuiltins, "builtins", "(Builtins)") \ |
| V(kGlobalHandles, "globalhandles", "(Global handles)") \ |
| V(kEternalHandles, "eternalhandles", "(Eternal handles)") \ |
| V(kThreadManager, "threadmanager", "(Thread manager)") \ |
| V(kStrongRoots, "strong roots", "(Strong roots)") \ |
| V(kExtensions, "Extensions", "(Extensions)") |
| |
| class VisitorSynchronization : public AllStatic { |
| public: |
| #define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item, |
| enum SyncTag { |
| VISITOR_SYNCHRONIZATION_TAGS_LIST(DECLARE_ENUM) |
| kNumberOfSyncTags |
| }; |
| #undef DECLARE_ENUM |
| |
| static const char* const kTags[kNumberOfSyncTags]; |
| static const char* const kTagNames[kNumberOfSyncTags]; |
| }; |
| |
| // Abstract base class for visiting, and optionally modifying, the |
| // pointers contained in Objects. Used in GC and serialization/deserialization. |
| class ObjectVisitor BASE_EMBEDDED { |
| public: |
| virtual ~ObjectVisitor() {} |
| |
| // Visits a contiguous arrays of pointers in the half-open range |
| // [start, end). Any or all of the values may be modified on return. |
| virtual void VisitPointers(Object** start, Object** end) = 0; |
| |
| // Handy shorthand for visiting a single pointer. |
| virtual void VisitPointer(Object** p) { VisitPointers(p, p + 1); } |
| |
| // Visit weak next_code_link in Code object. |
| virtual void VisitNextCodeLink(Object** p) { VisitPointers(p, p + 1); } |
| |
| // To allow lazy clearing of inline caches the visitor has |
| // a rich interface for iterating over Code objects.. |
| |
| // Visits a code target in the instruction stream. |
| virtual void VisitCodeTarget(RelocInfo* rinfo); |
| |
| // Visits a code entry in a JS function. |
| virtual void VisitCodeEntry(Address entry_address); |
| |
| // Visits a global property cell reference in the instruction stream. |
| virtual void VisitCell(RelocInfo* rinfo); |
| |
| // Visits a runtime entry in the instruction stream. |
| virtual void VisitRuntimeEntry(RelocInfo* rinfo) {} |
| |
| // Visits the resource of an one-byte or two-byte string. |
| virtual void VisitExternalOneByteString( |
| v8::String::ExternalOneByteStringResource** resource) {} |
| virtual void VisitExternalTwoByteString( |
| v8::String::ExternalStringResource** resource) {} |
| |
| // Visits a debug call target in the instruction stream. |
| virtual void VisitDebugTarget(RelocInfo* rinfo); |
| |
| // Visits the byte sequence in a function's prologue that contains information |
| // about the code's age. |
| virtual void VisitCodeAgeSequence(RelocInfo* rinfo); |
| |
| // Visit pointer embedded into a code object. |
| virtual void VisitEmbeddedPointer(RelocInfo* rinfo); |
| |
| // Visits an external reference embedded into a code object. |
| virtual void VisitExternalReference(RelocInfo* rinfo); |
| |
| // Visits an external reference. |
| virtual void VisitExternalReference(Address* p) {} |
| |
| // Visits an (encoded) internal reference. |
| virtual void VisitInternalReference(RelocInfo* rinfo) {} |
| |
| // Visits a handle that has an embedder-assigned class ID. |
| virtual void VisitEmbedderReference(Object** p, uint16_t class_id) {} |
| |
| // Intended for serialization/deserialization checking: insert, or |
| // check for the presence of, a tag at this position in the stream. |
| // Also used for marking up GC roots in heap snapshots. |
| virtual void Synchronize(VisitorSynchronization::SyncTag tag) {} |
| }; |
| |
| |
| // BooleanBit is a helper class for setting and getting a bit in an integer. |
| class BooleanBit : public AllStatic { |
| public: |
| static inline bool get(int value, int bit_position) { |
| return (value & (1 << bit_position)) != 0; |
| } |
| |
| static inline int set(int value, int bit_position, bool v) { |
| if (v) { |
| value |= (1 << bit_position); |
| } else { |
| value &= ~(1 << bit_position); |
| } |
| return value; |
| } |
| }; |
| |
| |
| } // NOLINT, false-positive due to second-order macros. |
| } // NOLINT, false-positive due to second-order macros. |
| |
| #endif // V8_OBJECTS_H_ |