| // Copyright 2018 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_COMPILER_JS_HEAP_BROKER_H_ |
| #define V8_COMPILER_JS_HEAP_BROKER_H_ |
| |
| #include "src/base/compiler-specific.h" |
| #include "src/base/optional.h" |
| #include "src/compiler/refs-map.h" |
| #include "src/feedback-vector.h" |
| #include "src/function-kind.h" |
| #include "src/globals.h" |
| #include "src/handles.h" |
| #include "src/objects.h" |
| #include "src/objects/instance-type.h" |
| #include "src/ostreams.h" |
| #include "src/zone/zone-containers.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| class BytecodeArray; |
| class VectorSlotPair; |
| class FixedDoubleArray; |
| class HeapNumber; |
| class InternalizedString; |
| class JSBoundFunction; |
| class JSDataView; |
| class JSGlobalProxy; |
| class JSRegExp; |
| class JSTypedArray; |
| class NativeContext; |
| class ScriptContextTable; |
| |
| namespace compiler { |
| |
| enum class OddballType : uint8_t { |
| kNone, // Not an Oddball. |
| kBoolean, // True or False. |
| kUndefined, |
| kNull, |
| kHole, |
| kUninitialized, |
| kOther // Oddball, but none of the above. |
| }; |
| |
| // This list is sorted such that subtypes appear before their supertypes. |
| // DO NOT VIOLATE THIS PROPERTY! |
| #define HEAP_BROKER_OBJECT_LIST(V) \ |
| /* Subtypes of JSObject */ \ |
| V(JSArray) \ |
| V(JSBoundFunction) \ |
| V(JSDataView) \ |
| V(JSFunction) \ |
| V(JSGlobalProxy) \ |
| V(JSRegExp) \ |
| V(JSTypedArray) \ |
| /* Subtypes of Context */ \ |
| V(NativeContext) \ |
| /* Subtypes of FixedArray */ \ |
| V(Context) \ |
| V(ScopeInfo) \ |
| V(ScriptContextTable) \ |
| /* Subtypes of FixedArrayBase */ \ |
| V(BytecodeArray) \ |
| V(FixedArray) \ |
| V(FixedDoubleArray) \ |
| /* Subtypes of Name */ \ |
| V(InternalizedString) \ |
| V(String) \ |
| V(Symbol) \ |
| /* Subtypes of HeapObject */ \ |
| V(AllocationSite) \ |
| V(Cell) \ |
| V(Code) \ |
| V(DescriptorArray) \ |
| V(FeedbackVector) \ |
| V(FixedArrayBase) \ |
| V(HeapNumber) \ |
| V(JSObject) \ |
| V(Map) \ |
| V(Module) \ |
| V(MutableHeapNumber) \ |
| V(Name) \ |
| V(PropertyCell) \ |
| V(SharedFunctionInfo) \ |
| /* Subtypes of Object */ \ |
| V(HeapObject) |
| |
| class CompilationDependencies; |
| class JSHeapBroker; |
| class ObjectData; |
| class PerIsolateCompilerCache; |
| #define FORWARD_DECL(Name) class Name##Ref; |
| HEAP_BROKER_OBJECT_LIST(FORWARD_DECL) |
| #undef FORWARD_DECL |
| |
| class ObjectRef { |
| public: |
| ObjectRef(JSHeapBroker* broker, Handle<Object> object); |
| ObjectRef(JSHeapBroker* broker, ObjectData* data) |
| : data_(data), broker_(broker) { |
| CHECK_NOT_NULL(data_); |
| } |
| |
| Handle<Object> object() const; |
| |
| bool equals(const ObjectRef& other) const; |
| |
| bool IsSmi() const; |
| int AsSmi() const; |
| |
| #define HEAP_IS_METHOD_DECL(Name) bool Is##Name() const; |
| HEAP_BROKER_OBJECT_LIST(HEAP_IS_METHOD_DECL) |
| #undef HEAP_IS_METHOD_DECL |
| |
| #define HEAP_AS_METHOD_DECL(Name) Name##Ref As##Name() const; |
| HEAP_BROKER_OBJECT_LIST(HEAP_AS_METHOD_DECL) |
| #undef HEAP_AS_METHOD_DECL |
| |
| bool IsNullOrUndefined() const; |
| |
| bool BooleanValue() const; |
| Maybe<double> OddballToNumber() const; |
| |
| Isolate* isolate() const; |
| |
| protected: |
| JSHeapBroker* broker() const; |
| ObjectData* data() const; |
| ObjectData* data_; // Should be used only by object() getters. |
| |
| private: |
| friend class JSGlobalProxyRef; |
| friend class JSGlobalProxyData; |
| JSHeapBroker* broker_; |
| }; |
| |
| // Temporary class that carries information from a Map. We'd like to remove |
| // this class and use MapRef instead, but we can't as long as we support the |
| // kDisabled broker mode. That's because obtaining the MapRef via |
| // HeapObjectRef::map() requires a HandleScope when the broker is disabled. |
| // During OptimizeGraph we generally don't have a HandleScope, however. There |
| // are two places where we therefore use GetHeapObjectType() instead. Both that |
| // function and this class should eventually be removed. |
| class HeapObjectType { |
| public: |
| enum Flag : uint8_t { kUndetectable = 1 << 0, kCallable = 1 << 1 }; |
| |
| typedef base::Flags<Flag> Flags; |
| |
| HeapObjectType(InstanceType instance_type, Flags flags, |
| OddballType oddball_type) |
| : instance_type_(instance_type), |
| oddball_type_(oddball_type), |
| flags_(flags) { |
| DCHECK_EQ(instance_type == ODDBALL_TYPE, |
| oddball_type != OddballType::kNone); |
| } |
| |
| OddballType oddball_type() const { return oddball_type_; } |
| InstanceType instance_type() const { return instance_type_; } |
| Flags flags() const { return flags_; } |
| |
| bool is_callable() const { return flags_ & kCallable; } |
| bool is_undetectable() const { return flags_ & kUndetectable; } |
| |
| private: |
| InstanceType const instance_type_; |
| OddballType const oddball_type_; |
| Flags const flags_; |
| }; |
| |
| class HeapObjectRef : public ObjectRef { |
| public: |
| using ObjectRef::ObjectRef; |
| Handle<HeapObject> object() const; |
| |
| MapRef map() const; |
| |
| // See the comment on the HeapObjectType class. |
| HeapObjectType GetHeapObjectType() const; |
| }; |
| |
| class PropertyCellRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<PropertyCell> object() const; |
| |
| PropertyDetails property_details() const; |
| |
| void Serialize(); |
| ObjectRef value() const; |
| }; |
| |
| class JSObjectRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<JSObject> object() const; |
| |
| double RawFastDoublePropertyAt(FieldIndex index) const; |
| ObjectRef RawFastPropertyAt(FieldIndex index) const; |
| |
| FixedArrayBaseRef elements() const; |
| void EnsureElementsTenured(); |
| ElementsKind GetElementsKind() const; |
| |
| void SerializeObjectCreateMap(); |
| base::Optional<MapRef> GetObjectCreateMap() const; |
| }; |
| |
| class JSDataViewRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSDataView> object() const; |
| |
| size_t byte_length() const; |
| size_t byte_offset() const; |
| }; |
| |
| class JSBoundFunctionRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSBoundFunction> object() const; |
| |
| void Serialize(); |
| |
| // The following are available only after calling Serialize(). |
| ObjectRef bound_target_function() const; |
| ObjectRef bound_this() const; |
| FixedArrayRef bound_arguments() const; |
| }; |
| |
| class JSFunctionRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSFunction> object() const; |
| |
| bool has_feedback_vector() const; |
| bool has_initial_map() const; |
| bool has_prototype() const; |
| bool PrototypeRequiresRuntimeLookup() const; |
| |
| void Serialize(); |
| bool IsSerializedForCompilation() const; |
| |
| // The following are available only after calling Serialize(). |
| ObjectRef prototype() const; |
| MapRef initial_map() const; |
| ContextRef context() const; |
| NativeContextRef native_context() const; |
| SharedFunctionInfoRef shared() const; |
| FeedbackVectorRef feedback_vector() const; |
| int InitialMapInstanceSizeWithMinSlack() const; |
| }; |
| |
| class JSRegExpRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSRegExp> object() const; |
| |
| ObjectRef raw_properties_or_hash() const; |
| ObjectRef data() const; |
| ObjectRef source() const; |
| ObjectRef flags() const; |
| ObjectRef last_index() const; |
| }; |
| |
| class HeapNumberRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<HeapNumber> object() const; |
| |
| double value() const; |
| }; |
| |
| class MutableHeapNumberRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<MutableHeapNumber> object() const; |
| |
| double value() const; |
| }; |
| |
| class ContextRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Context> object() const; |
| |
| void SerializeContextChain(); |
| ContextRef previous() const; |
| |
| void SerializeSlot(int index); |
| ObjectRef get(int index) const; |
| }; |
| |
| #define BROKER_COMPULSORY_NATIVE_CONTEXT_FIELDS(V) \ |
| V(JSFunction, array_function) \ |
| V(JSFunction, boolean_function) \ |
| V(JSFunction, bigint_function) \ |
| V(JSFunction, number_function) \ |
| V(JSFunction, object_function) \ |
| V(JSFunction, promise_function) \ |
| V(JSFunction, promise_then) \ |
| V(JSFunction, string_function) \ |
| V(JSFunction, symbol_function) \ |
| V(JSGlobalProxy, global_proxy_object) \ |
| V(JSObject, promise_prototype) \ |
| V(Map, bound_function_with_constructor_map) \ |
| V(Map, bound_function_without_constructor_map) \ |
| V(Map, fast_aliased_arguments_map) \ |
| V(Map, initial_array_iterator_map) \ |
| V(Map, initial_string_iterator_map) \ |
| V(Map, iterator_result_map) \ |
| V(Map, js_array_holey_double_elements_map) \ |
| V(Map, js_array_holey_elements_map) \ |
| V(Map, js_array_holey_smi_elements_map) \ |
| V(Map, js_array_packed_double_elements_map) \ |
| V(Map, js_array_packed_elements_map) \ |
| V(Map, js_array_packed_smi_elements_map) \ |
| V(Map, sloppy_arguments_map) \ |
| V(Map, slow_object_with_null_prototype_map) \ |
| V(Map, strict_arguments_map) \ |
| V(ScriptContextTable, script_context_table) \ |
| V(SharedFunctionInfo, promise_capability_default_reject_shared_fun) \ |
| V(SharedFunctionInfo, promise_catch_finally_shared_fun) \ |
| V(SharedFunctionInfo, promise_then_finally_shared_fun) \ |
| V(SharedFunctionInfo, promise_capability_default_resolve_shared_fun) |
| |
| // Those are set by Bootstrapper::ExportFromRuntime, which may not yet have |
| // happened when Turbofan is invoked via --always-opt. |
| #define BROKER_OPTIONAL_NATIVE_CONTEXT_FIELDS(V) \ |
| V(Map, async_function_object_map) \ |
| V(Map, map_key_iterator_map) \ |
| V(Map, map_key_value_iterator_map) \ |
| V(Map, map_value_iterator_map) \ |
| V(Map, set_key_value_iterator_map) \ |
| V(Map, set_value_iterator_map) |
| |
| #define BROKER_NATIVE_CONTEXT_FIELDS(V) \ |
| BROKER_COMPULSORY_NATIVE_CONTEXT_FIELDS(V) \ |
| BROKER_OPTIONAL_NATIVE_CONTEXT_FIELDS(V) |
| |
| class NativeContextRef : public ContextRef { |
| public: |
| using ContextRef::ContextRef; |
| Handle<NativeContext> object() const; |
| |
| void Serialize(); |
| |
| #define DECL_ACCESSOR(type, name) type##Ref name() const; |
| BROKER_NATIVE_CONTEXT_FIELDS(DECL_ACCESSOR) |
| #undef DECL_ACCESSOR |
| |
| MapRef GetFunctionMapFromIndex(int index) const; |
| MapRef GetInitialJSArrayMap(ElementsKind kind) const; |
| base::Optional<JSFunctionRef> GetConstructorFunction(const MapRef& map) const; |
| }; |
| |
| class NameRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Name> object() const; |
| }; |
| |
| class ScriptContextTableRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<ScriptContextTable> object() const; |
| |
| struct LookupResult { |
| ContextRef context; |
| bool immutable; |
| int index; |
| }; |
| |
| base::Optional<LookupResult> lookup(const NameRef& name) const; |
| }; |
| |
| class DescriptorArrayRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<DescriptorArray> object() const; |
| }; |
| |
| class FeedbackVectorRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<FeedbackVector> object() const; |
| |
| ObjectRef get(FeedbackSlot slot) const; |
| |
| void SerializeSlots(); |
| }; |
| |
| class AllocationSiteRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<AllocationSite> object() const; |
| |
| bool PointsToLiteral() const; |
| AllocationType GetAllocationType() const; |
| ObjectRef nested_site() const; |
| |
| // {IsFastLiteral} determines whether the given array or object literal |
| // boilerplate satisfies all limits to be considered for fast deep-copying |
| // and computes the total size of all objects that are part of the graph. |
| // |
| // If PointsToLiteral() is false, then IsFastLiteral() is also false. |
| bool IsFastLiteral() const; |
| // We only serialize boilerplate if IsFastLiteral is true. |
| base::Optional<JSObjectRef> boilerplate() const; |
| |
| ElementsKind GetElementsKind() const; |
| bool CanInlineCall() const; |
| }; |
| |
| class MapRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Map> object() const; |
| |
| int instance_size() const; |
| InstanceType instance_type() const; |
| int GetInObjectProperties() const; |
| int GetInObjectPropertiesStartInWords() const; |
| int NumberOfOwnDescriptors() const; |
| int GetInObjectPropertyOffset(int index) const; |
| int constructor_function_index() const; |
| int NextFreePropertyIndex() const; |
| int UnusedPropertyFields() const; |
| ElementsKind elements_kind() const; |
| bool is_stable() const; |
| bool is_extensible() const; |
| bool is_constructor() const; |
| bool has_prototype_slot() const; |
| bool is_access_check_needed() const; |
| bool is_deprecated() const; |
| bool CanBeDeprecated() const; |
| bool CanTransition() const; |
| bool IsInobjectSlackTrackingInProgress() const; |
| bool is_dictionary_map() const; |
| bool IsFixedCowArrayMap() const; |
| bool IsPrimitiveMap() const; |
| bool is_undetectable() const; |
| bool is_callable() const; |
| bool has_indexed_interceptor() const; |
| bool has_hidden_prototype() const; |
| bool is_migration_target() const; |
| bool supports_fast_array_iteration() const; |
| bool supports_fast_array_resize() const; |
| bool IsMapOfCurrentGlobalProxy() const; |
| |
| #define DEF_TESTER(Type, ...) bool Is##Type##Map() const; |
| INSTANCE_TYPE_CHECKERS(DEF_TESTER) |
| #undef DEF_TESTER |
| |
| ObjectRef GetConstructor() const; |
| OddballType oddball_type() const; |
| base::Optional<MapRef> AsElementsKind(ElementsKind kind) const; |
| |
| void SerializePrototype(); |
| bool serialized_prototype() const; |
| ObjectRef prototype() const; |
| |
| void SerializeForElementLoad(); |
| |
| void SerializeForElementStore(); |
| bool HasOnlyStablePrototypesWithFastElements( |
| ZoneVector<MapRef>* prototype_maps); |
| |
| // Concerning the underlying instance_descriptors: |
| void SerializeOwnDescriptors(); |
| MapRef FindFieldOwner(int descriptor_index) const; |
| PropertyDetails GetPropertyDetails(int descriptor_index) const; |
| NameRef GetPropertyKey(int descriptor_index) const; |
| FieldIndex GetFieldIndexFor(int descriptor_index) const; |
| ObjectRef GetFieldType(int descriptor_index) const; |
| bool IsUnboxedDoubleField(int descriptor_index) const; |
| }; |
| |
| class FixedArrayBaseRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<FixedArrayBase> object() const; |
| |
| int length() const; |
| }; |
| |
| class FixedArrayRef : public FixedArrayBaseRef { |
| public: |
| using FixedArrayBaseRef::FixedArrayBaseRef; |
| Handle<FixedArray> object() const; |
| |
| ObjectRef get(int i) const; |
| }; |
| |
| class FixedDoubleArrayRef : public FixedArrayBaseRef { |
| public: |
| using FixedArrayBaseRef::FixedArrayBaseRef; |
| Handle<FixedDoubleArray> object() const; |
| |
| double get_scalar(int i) const; |
| bool is_the_hole(int i) const; |
| }; |
| |
| class BytecodeArrayRef : public FixedArrayBaseRef { |
| public: |
| using FixedArrayBaseRef::FixedArrayBaseRef; |
| Handle<BytecodeArray> object() const; |
| |
| int register_count() const; |
| }; |
| |
| class JSArrayRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSArray> object() const; |
| |
| ObjectRef length() const; |
| }; |
| |
| class ScopeInfoRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<ScopeInfo> object() const; |
| |
| int ContextLength() const; |
| }; |
| |
| #define BROKER_SFI_FIELDS(V) \ |
| V(int, internal_formal_parameter_count) \ |
| V(bool, has_duplicate_parameters) \ |
| V(int, function_map_index) \ |
| V(FunctionKind, kind) \ |
| V(LanguageMode, language_mode) \ |
| V(bool, native) \ |
| V(bool, HasBreakInfo) \ |
| V(bool, HasBuiltinId) \ |
| V(bool, construct_as_builtin) \ |
| V(bool, HasBytecodeArray) \ |
| V(bool, is_safe_to_skip_arguments_adaptor) \ |
| V(bool, IsInlineable) |
| |
| class SharedFunctionInfoRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<SharedFunctionInfo> object() const; |
| |
| int builtin_id() const; |
| BytecodeArrayRef GetBytecodeArray() const; |
| |
| #define DECL_ACCESSOR(type, name) type name() const; |
| BROKER_SFI_FIELDS(DECL_ACCESSOR) |
| #undef DECL_ACCESSOR |
| |
| bool IsSerializedForCompilation(FeedbackVectorRef feedback) const; |
| void SetSerializedForCompilation(FeedbackVectorRef feedback); |
| }; |
| |
| class StringRef : public NameRef { |
| public: |
| using NameRef::NameRef; |
| Handle<String> object() const; |
| |
| int length() const; |
| uint16_t GetFirstChar(); |
| base::Optional<double> ToNumber(); |
| bool IsSeqString() const; |
| bool IsExternalString() const; |
| }; |
| |
| class SymbolRef : public NameRef { |
| public: |
| using NameRef::NameRef; |
| Handle<Symbol> object() const; |
| }; |
| |
| class JSTypedArrayRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSTypedArray> object() const; |
| |
| bool is_on_heap() const; |
| size_t length_value() const; |
| void* elements_external_pointer() const; |
| |
| void Serialize(); |
| bool serialized() const; |
| |
| HeapObjectRef buffer() const; |
| }; |
| |
| class ModuleRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Module> object() const; |
| |
| void Serialize(); |
| |
| CellRef GetCell(int cell_index) const; |
| }; |
| |
| class CellRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Cell> object() const; |
| |
| ObjectRef value() const; |
| }; |
| |
| class JSGlobalProxyRef : public JSObjectRef { |
| public: |
| using JSObjectRef::JSObjectRef; |
| Handle<JSGlobalProxy> object() const; |
| |
| // If {serialize} is false: |
| // If the property is known to exist as a property cell (on the global |
| // object), return that property cell. Otherwise (not known to exist as a |
| // property cell or known not to exist as a property cell) return nothing. |
| // If {serialize} is true: |
| // Like above but potentially access the heap and serialize the necessary |
| // information. |
| base::Optional<PropertyCellRef> GetPropertyCell(NameRef const& name, |
| bool serialize = false) const; |
| }; |
| |
| class CodeRef : public HeapObjectRef { |
| public: |
| using HeapObjectRef::HeapObjectRef; |
| Handle<Code> object() const; |
| }; |
| |
| class InternalizedStringRef : public StringRef { |
| public: |
| using StringRef::StringRef; |
| Handle<InternalizedString> object() const; |
| |
| uint32_t array_index() const; |
| static const uint32_t kNotAnArrayIndex = -1; // 2^32-1 is not a valid index. |
| }; |
| |
| class ProcessedFeedback : public ZoneObject { |
| public: |
| enum Kind { kElementAccess, kGlobalAccess }; |
| Kind kind() const { return kind_; } |
| |
| protected: |
| explicit ProcessedFeedback(Kind kind) : kind_(kind) {} |
| |
| private: |
| Kind const kind_; |
| }; |
| |
| class GlobalAccessFeedback : public ProcessedFeedback { |
| public: |
| explicit GlobalAccessFeedback(PropertyCellRef cell); |
| GlobalAccessFeedback(ContextRef script_context, int slot_index, |
| bool immutable); |
| |
| bool IsPropertyCell() const; |
| PropertyCellRef property_cell() const; |
| |
| bool IsScriptContextSlot() const { return !IsPropertyCell(); } |
| ContextRef script_context() const; |
| int slot_index() const; |
| bool immutable() const; |
| |
| base::Optional<ObjectRef> GetConstantHint() const; |
| |
| private: |
| ObjectRef const cell_or_context_; |
| int const index_and_immutable_; |
| }; |
| |
| class ElementAccessFeedback : public ProcessedFeedback { |
| public: |
| explicit ElementAccessFeedback(Zone* zone); |
| |
| // No transition sources appear in {receiver_maps}. |
| // All transition targets appear in {receiver_maps}. |
| ZoneVector<Handle<Map>> receiver_maps; |
| ZoneVector<std::pair<Handle<Map>, Handle<Map>>> transitions; |
| |
| class MapIterator { |
| public: |
| bool done() const; |
| void advance(); |
| MapRef current() const; |
| |
| private: |
| friend class ElementAccessFeedback; |
| |
| explicit MapIterator(ElementAccessFeedback const& processed, |
| JSHeapBroker* broker); |
| |
| ElementAccessFeedback const& processed_; |
| JSHeapBroker* const broker_; |
| size_t index_ = 0; |
| }; |
| |
| // Iterator over all maps: first {receiver_maps}, then transition sources. |
| MapIterator all_maps(JSHeapBroker* broker) const; |
| }; |
| |
| struct FeedbackSource { |
| FeedbackSource(Handle<FeedbackVector> vector_, FeedbackSlot slot_) |
| : vector(vector_), slot(slot_) {} |
| explicit FeedbackSource(FeedbackNexus const& nexus); |
| explicit FeedbackSource(VectorSlotPair const& pair); |
| |
| Handle<FeedbackVector> const vector; |
| FeedbackSlot const slot; |
| |
| struct Hash { |
| size_t operator()(FeedbackSource const& source) const { |
| return base::hash_combine(source.vector.address(), source.slot); |
| } |
| }; |
| |
| struct Equal { |
| bool operator()(FeedbackSource const& lhs, |
| FeedbackSource const& rhs) const { |
| return lhs.vector.equals(rhs.vector) && lhs.slot == rhs.slot; |
| } |
| }; |
| }; |
| |
| class V8_EXPORT_PRIVATE JSHeapBroker : public NON_EXPORTED_BASE(ZoneObject) { |
| public: |
| JSHeapBroker(Isolate* isolate, Zone* broker_zone); |
| |
| void SetNativeContextRef(); |
| void SerializeStandardObjects(); |
| |
| Isolate* isolate() const { return isolate_; } |
| Zone* zone() const { return current_zone_; } |
| NativeContextRef native_context() const { return native_context_.value(); } |
| PerIsolateCompilerCache* compiler_cache() const { return compiler_cache_; } |
| |
| enum BrokerMode { kDisabled, kSerializing, kSerialized, kRetired }; |
| BrokerMode mode() const { return mode_; } |
| void StartSerializing(); |
| void StopSerializing(); |
| void Retire(); |
| bool SerializingAllowed() const; |
| |
| // Returns nullptr iff handle unknown. |
| ObjectData* GetData(Handle<Object>) const; |
| // Never returns nullptr. |
| ObjectData* GetOrCreateData(Handle<Object>); |
| // Like the previous but wraps argument in handle first (for convenience). |
| ObjectData* GetOrCreateData(Object); |
| |
| // Check if {object} is any native context's %ArrayPrototype% or |
| // %ObjectPrototype%. |
| bool IsArrayOrObjectPrototype(const JSObjectRef& object) const; |
| |
| bool HasFeedback(FeedbackSource const& source) const; |
| // The processed {feedback} can be {nullptr}, indicating that the original |
| // feedback didn't contain information relevant for Turbofan. |
| void SetFeedback(FeedbackSource const& source, |
| ProcessedFeedback const* feedback); |
| ProcessedFeedback const* GetFeedback(FeedbackSource const& source) const; |
| |
| // Convenience wrappers around GetFeedback. |
| ElementAccessFeedback const* GetElementAccessFeedback( |
| FeedbackSource const& source) const; |
| GlobalAccessFeedback const* GetGlobalAccessFeedback( |
| FeedbackSource const& source) const; |
| |
| // TODO(neis): Move these into serializer when we're always in the background. |
| ElementAccessFeedback const* ProcessFeedbackMapsForElementAccess( |
| MapHandles const& maps); |
| GlobalAccessFeedback const* ProcessFeedbackForGlobalAccess( |
| FeedbackSource const& source); |
| |
| std::ostream& Trace(); |
| void IncrementTracingIndentation(); |
| void DecrementTracingIndentation(); |
| |
| private: |
| friend class HeapObjectRef; |
| friend class ObjectRef; |
| friend class ObjectData; |
| |
| void SerializeShareableObjects(); |
| void CollectArrayAndObjectPrototypes(); |
| |
| Isolate* const isolate_; |
| Zone* const broker_zone_; |
| Zone* current_zone_; |
| base::Optional<NativeContextRef> native_context_; |
| RefsMap* refs_; |
| ZoneUnorderedSet<Handle<JSObject>, Handle<JSObject>::hash, |
| Handle<JSObject>::equal_to> |
| array_and_object_prototypes_; |
| BrokerMode mode_ = kDisabled; |
| StdoutStream trace_out_; |
| unsigned trace_indentation_ = 0; |
| PerIsolateCompilerCache* compiler_cache_; |
| ZoneUnorderedMap<FeedbackSource, ProcessedFeedback const*, |
| FeedbackSource::Hash, FeedbackSource::Equal> |
| feedback_; |
| |
| static const size_t kMinimalRefsBucketCount = 8; // must be power of 2 |
| static const size_t kInitialRefsBucketCount = 1024; // must be power of 2 |
| }; |
| |
| #define ASSIGN_RETURN_NO_CHANGE_IF_DATA_MISSING(something_var, \ |
| optionally_something) \ |
| auto optionally_something_ = optionally_something; \ |
| if (!optionally_something_) \ |
| return NoChangeBecauseOfMissingData(broker(), __FUNCTION__, __LINE__); \ |
| something_var = *optionally_something_; |
| |
| class Reduction; |
| Reduction NoChangeBecauseOfMissingData(JSHeapBroker* broker, |
| const char* function, int line); |
| |
| // Miscellaneous definitions that should be moved elsewhere once concurrent |
| // compilation is finished. |
| bool CanInlineElementAccess(MapRef const& map); |
| |
| #define TRACE_BROKER(broker, x) \ |
| do { \ |
| if (FLAG_trace_heap_broker) broker->Trace() << x << '\n'; \ |
| } while (false) |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_COMPILER_JS_HEAP_BROKER_H_ |