| // Copyright 2016 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. |
| |
| #include "src/builtins/builtins-constructor-gen.h" |
| |
| #include "src/ast/ast.h" |
| #include "src/builtins/builtins-call-gen.h" |
| #include "src/builtins/builtins-constructor.h" |
| #include "src/builtins/builtins-utils-gen.h" |
| #include "src/builtins/builtins.h" |
| #include "src/code-factory.h" |
| #include "src/code-stub-assembler.h" |
| #include "src/counters.h" |
| #include "src/interface-descriptors.h" |
| #include "src/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| void Builtins::Generate_ConstructVarargs(MacroAssembler* masm) { |
| Generate_CallOrConstructVarargs(masm, |
| BUILTIN_CODE(masm->isolate(), Construct)); |
| } |
| |
| void Builtins::Generate_ConstructForwardVarargs(MacroAssembler* masm) { |
| Generate_CallOrConstructForwardVarargs( |
| masm, CallOrConstructMode::kConstruct, |
| BUILTIN_CODE(masm->isolate(), Construct)); |
| } |
| |
| void Builtins::Generate_ConstructFunctionForwardVarargs(MacroAssembler* masm) { |
| Generate_CallOrConstructForwardVarargs( |
| masm, CallOrConstructMode::kConstruct, |
| BUILTIN_CODE(masm->isolate(), ConstructFunction)); |
| } |
| |
| TF_BUILTIN(ConstructWithArrayLike, CallOrConstructBuiltinsAssembler) { |
| TNode<Object> target = CAST(Parameter(Descriptor::kTarget)); |
| SloppyTNode<Object> new_target = CAST(Parameter(Descriptor::kNewTarget)); |
| TNode<Object> arguments_list = CAST(Parameter(Descriptor::kArgumentsList)); |
| TNode<Context> context = CAST(Parameter(Descriptor::kContext)); |
| CallOrConstructWithArrayLike(target, new_target, arguments_list, context); |
| } |
| |
| TF_BUILTIN(ConstructWithSpread, CallOrConstructBuiltinsAssembler) { |
| TNode<Object> target = CAST(Parameter(Descriptor::kTarget)); |
| SloppyTNode<Object> new_target = CAST(Parameter(Descriptor::kNewTarget)); |
| TNode<Object> spread = CAST(Parameter(Descriptor::kSpread)); |
| TNode<Int32T> args_count = |
| UncheckedCast<Int32T>(Parameter(Descriptor::kActualArgumentsCount)); |
| TNode<Context> context = CAST(Parameter(Descriptor::kContext)); |
| CallOrConstructWithSpread(target, new_target, spread, args_count, context); |
| } |
| |
| typedef compiler::Node Node; |
| |
| TF_BUILTIN(FastNewClosure, ConstructorBuiltinsAssembler) { |
| Node* shared_function_info = Parameter(Descriptor::kSharedFunctionInfo); |
| Node* feedback_cell = Parameter(Descriptor::kFeedbackCell); |
| Node* context = Parameter(Descriptor::kContext); |
| |
| CSA_ASSERT(this, IsFeedbackCell(feedback_cell)); |
| CSA_ASSERT(this, IsSharedFunctionInfo(shared_function_info)); |
| |
| IncrementCounter(isolate()->counters()->fast_new_closure_total(), 1); |
| |
| // Bump the closure counter encoded the {feedback_cell}s map. |
| { |
| Node* const feedback_cell_map = LoadMap(feedback_cell); |
| Label no_closures(this), one_closure(this), cell_done(this); |
| |
| GotoIf(IsNoClosuresCellMap(feedback_cell_map), &no_closures); |
| GotoIf(IsOneClosureCellMap(feedback_cell_map), &one_closure); |
| CSA_ASSERT(this, IsManyClosuresCellMap(feedback_cell_map), |
| feedback_cell_map, feedback_cell); |
| Goto(&cell_done); |
| |
| BIND(&no_closures); |
| StoreMapNoWriteBarrier(feedback_cell, Heap::kOneClosureCellMapRootIndex); |
| Goto(&cell_done); |
| |
| BIND(&one_closure); |
| StoreMapNoWriteBarrier(feedback_cell, Heap::kManyClosuresCellMapRootIndex); |
| Goto(&cell_done); |
| |
| BIND(&cell_done); |
| } |
| |
| // The calculation of |function_map_index| must be in sync with |
| // SharedFunctionInfo::function_map_index(). |
| Node* const flags = |
| LoadObjectField(shared_function_info, SharedFunctionInfo::kFlagsOffset, |
| MachineType::Uint32()); |
| Node* const function_map_index = IntPtrAdd( |
| DecodeWordFromWord32<SharedFunctionInfo::FunctionMapIndexBits>(flags), |
| IntPtrConstant(Context::FIRST_FUNCTION_MAP_INDEX)); |
| CSA_ASSERT(this, UintPtrLessThanOrEqual( |
| function_map_index, |
| IntPtrConstant(Context::LAST_FUNCTION_MAP_INDEX))); |
| |
| // Get the function map in the current native context and set that |
| // as the map of the allocated object. |
| Node* const native_context = LoadNativeContext(context); |
| Node* const function_map = |
| LoadContextElement(native_context, function_map_index); |
| |
| // Create a new closure from the given function info in new space |
| Node* instance_size_in_bytes = |
| TimesPointerSize(LoadMapInstanceSizeInWords(function_map)); |
| Node* const result = Allocate(instance_size_in_bytes); |
| StoreMapNoWriteBarrier(result, function_map); |
| InitializeJSObjectBodyNoSlackTracking(result, function_map, |
| instance_size_in_bytes, |
| JSFunction::kSizeWithoutPrototype); |
| |
| // Initialize the rest of the function. |
| StoreObjectFieldRoot(result, JSObject::kPropertiesOrHashOffset, |
| Heap::kEmptyFixedArrayRootIndex); |
| StoreObjectFieldRoot(result, JSObject::kElementsOffset, |
| Heap::kEmptyFixedArrayRootIndex); |
| { |
| // Set function prototype if necessary. |
| Label done(this), init_prototype(this); |
| Branch(IsFunctionWithPrototypeSlotMap(function_map), &init_prototype, |
| &done); |
| |
| BIND(&init_prototype); |
| StoreObjectFieldRoot(result, JSFunction::kPrototypeOrInitialMapOffset, |
| Heap::kTheHoleValueRootIndex); |
| Goto(&done); |
| BIND(&done); |
| } |
| |
| STATIC_ASSERT(JSFunction::kSizeWithoutPrototype == 7 * kPointerSize); |
| StoreObjectFieldNoWriteBarrier(result, JSFunction::kFeedbackCellOffset, |
| feedback_cell); |
| StoreObjectFieldNoWriteBarrier(result, JSFunction::kSharedFunctionInfoOffset, |
| shared_function_info); |
| StoreObjectFieldNoWriteBarrier(result, JSFunction::kContextOffset, context); |
| Handle<Code> lazy_builtin_handle( |
| isolate()->builtins()->builtin(Builtins::kCompileLazy), isolate()); |
| Node* lazy_builtin = HeapConstant(lazy_builtin_handle); |
| StoreObjectFieldNoWriteBarrier(result, JSFunction::kCodeOffset, lazy_builtin); |
| Return(result); |
| } |
| |
| TF_BUILTIN(FastNewObject, ConstructorBuiltinsAssembler) { |
| Node* context = Parameter(Descriptor::kContext); |
| Node* target = Parameter(Descriptor::kTarget); |
| Node* new_target = Parameter(Descriptor::kNewTarget); |
| |
| Label call_runtime(this); |
| |
| Node* result = EmitFastNewObject(context, target, new_target, &call_runtime); |
| Return(result); |
| |
| BIND(&call_runtime); |
| TailCallRuntime(Runtime::kNewObject, context, target, new_target); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitFastNewObject(Node* context, |
| Node* target, |
| Node* new_target) { |
| VARIABLE(var_obj, MachineRepresentation::kTagged); |
| Label call_runtime(this), end(this); |
| |
| Node* result = EmitFastNewObject(context, target, new_target, &call_runtime); |
| var_obj.Bind(result); |
| Goto(&end); |
| |
| BIND(&call_runtime); |
| var_obj.Bind(CallRuntime(Runtime::kNewObject, context, target, new_target)); |
| Goto(&end); |
| |
| BIND(&end); |
| return var_obj.value(); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitFastNewObject(Node* context, |
| Node* target, |
| Node* new_target, |
| Label* call_runtime) { |
| CSA_ASSERT(this, HasInstanceType(target, JS_FUNCTION_TYPE)); |
| CSA_ASSERT(this, IsJSReceiver(new_target)); |
| |
| // Verify that the new target is a JSFunction. |
| Label fast(this), end(this); |
| GotoIf(HasInstanceType(new_target, JS_FUNCTION_TYPE), &fast); |
| Goto(call_runtime); |
| |
| BIND(&fast); |
| |
| // Load the initial map and verify that it's in fact a map. |
| Node* initial_map = |
| LoadObjectField(new_target, JSFunction::kPrototypeOrInitialMapOffset); |
| GotoIf(TaggedIsSmi(initial_map), call_runtime); |
| GotoIf(DoesntHaveInstanceType(initial_map, MAP_TYPE), call_runtime); |
| |
| // Fall back to runtime if the target differs from the new target's |
| // initial map constructor. |
| Node* new_target_constructor = |
| LoadObjectField(initial_map, Map::kConstructorOrBackPointerOffset); |
| GotoIf(WordNotEqual(target, new_target_constructor), call_runtime); |
| |
| VARIABLE(properties, MachineRepresentation::kTagged); |
| |
| Label instantiate_map(this), allocate_properties(this); |
| GotoIf(IsDictionaryMap(initial_map), &allocate_properties); |
| { |
| properties.Bind(EmptyFixedArrayConstant()); |
| Goto(&instantiate_map); |
| } |
| BIND(&allocate_properties); |
| { |
| properties.Bind(AllocateNameDictionary(NameDictionary::kInitialCapacity)); |
| Goto(&instantiate_map); |
| } |
| |
| BIND(&instantiate_map); |
| return AllocateJSObjectFromMap(initial_map, properties.value(), nullptr, |
| kNone, kWithSlackTracking); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitFastNewFunctionContext( |
| Node* scope_info, Node* slots, Node* context, ScopeType scope_type) { |
| slots = ChangeUint32ToWord(slots); |
| |
| // TODO(ishell): Use CSA::OptimalParameterMode() here. |
| ParameterMode mode = INTPTR_PARAMETERS; |
| Node* min_context_slots = IntPtrConstant(Context::MIN_CONTEXT_SLOTS); |
| Node* length = IntPtrAdd(slots, min_context_slots); |
| Node* size = GetFixedArrayAllocationSize(length, PACKED_ELEMENTS, mode); |
| |
| // Create a new closure from the given function info in new space |
| Node* function_context = AllocateInNewSpace(size); |
| |
| Heap::RootListIndex context_type; |
| switch (scope_type) { |
| case EVAL_SCOPE: |
| context_type = Heap::kEvalContextMapRootIndex; |
| break; |
| case FUNCTION_SCOPE: |
| context_type = Heap::kFunctionContextMapRootIndex; |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| StoreMapNoWriteBarrier(function_context, context_type); |
| StoreObjectFieldNoWriteBarrier(function_context, Context::kLengthOffset, |
| SmiTag(length)); |
| |
| // Set up the fixed slots. |
| StoreFixedArrayElement(function_context, Context::SCOPE_INFO_INDEX, |
| scope_info, SKIP_WRITE_BARRIER); |
| StoreFixedArrayElement(function_context, Context::PREVIOUS_INDEX, context, |
| SKIP_WRITE_BARRIER); |
| StoreFixedArrayElement(function_context, Context::EXTENSION_INDEX, |
| TheHoleConstant(), SKIP_WRITE_BARRIER); |
| |
| // Copy the native context from the previous context. |
| Node* native_context = LoadNativeContext(context); |
| StoreFixedArrayElement(function_context, Context::NATIVE_CONTEXT_INDEX, |
| native_context, SKIP_WRITE_BARRIER); |
| |
| // Initialize the rest of the slots to undefined. |
| Node* undefined = UndefinedConstant(); |
| BuildFastFixedArrayForEach( |
| function_context, PACKED_ELEMENTS, min_context_slots, length, |
| [this, undefined](Node* context, Node* offset) { |
| StoreNoWriteBarrier(MachineRepresentation::kTagged, context, offset, |
| undefined); |
| }, |
| mode); |
| |
| return function_context; |
| } |
| |
| TF_BUILTIN(FastNewFunctionContextEval, ConstructorBuiltinsAssembler) { |
| Node* scope_info = Parameter(Descriptor::kScopeInfo); |
| Node* slots = Parameter(Descriptor::kSlots); |
| Node* context = Parameter(Descriptor::kContext); |
| Return(EmitFastNewFunctionContext(scope_info, slots, context, |
| ScopeType::EVAL_SCOPE)); |
| } |
| |
| TF_BUILTIN(FastNewFunctionContextFunction, ConstructorBuiltinsAssembler) { |
| Node* scope_info = Parameter(Descriptor::kScopeInfo); |
| Node* slots = Parameter(Descriptor::kSlots); |
| Node* context = Parameter(Descriptor::kContext); |
| Return(EmitFastNewFunctionContext(scope_info, slots, context, |
| ScopeType::FUNCTION_SCOPE)); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitCreateRegExpLiteral( |
| Node* feedback_vector, Node* slot, Node* pattern, Node* flags, |
| Node* context) { |
| Label call_runtime(this, Label::kDeferred), end(this); |
| |
| VARIABLE(result, MachineRepresentation::kTagged); |
| TNode<Object> literal_site = |
| CAST(LoadFeedbackVectorSlot(feedback_vector, slot, 0, INTPTR_PARAMETERS)); |
| GotoIf(NotHasBoilerplate(literal_site), &call_runtime); |
| { |
| Node* boilerplate = literal_site; |
| CSA_ASSERT(this, IsJSRegExp(boilerplate)); |
| int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize; |
| Node* copy = Allocate(size); |
| for (int offset = 0; offset < size; offset += kPointerSize) { |
| Node* value = LoadObjectField(boilerplate, offset); |
| StoreObjectFieldNoWriteBarrier(copy, offset, value); |
| } |
| result.Bind(copy); |
| Goto(&end); |
| } |
| |
| BIND(&call_runtime); |
| { |
| result.Bind(CallRuntime(Runtime::kCreateRegExpLiteral, context, |
| feedback_vector, SmiTag(slot), pattern, flags)); |
| Goto(&end); |
| } |
| |
| BIND(&end); |
| return result.value(); |
| } |
| |
| TF_BUILTIN(CreateRegExpLiteral, ConstructorBuiltinsAssembler) { |
| Node* feedback_vector = Parameter(Descriptor::kFeedbackVector); |
| Node* slot = SmiUntag(Parameter(Descriptor::kSlot)); |
| Node* pattern = Parameter(Descriptor::kPattern); |
| Node* flags = Parameter(Descriptor::kFlags); |
| Node* context = Parameter(Descriptor::kContext); |
| Node* result = |
| EmitCreateRegExpLiteral(feedback_vector, slot, pattern, flags, context); |
| Return(result); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitCreateShallowArrayLiteral( |
| Node* feedback_vector, Node* slot, Node* context, Label* call_runtime, |
| AllocationSiteMode allocation_site_mode) { |
| Label zero_capacity(this), cow_elements(this), fast_elements(this), |
| return_result(this); |
| VARIABLE(result, MachineRepresentation::kTagged); |
| |
| TNode<Object> maybe_allocation_site = |
| CAST(LoadFeedbackVectorSlot(feedback_vector, slot, 0, INTPTR_PARAMETERS)); |
| GotoIf(NotHasBoilerplate(maybe_allocation_site), call_runtime); |
| |
| TNode<AllocationSite> allocation_site = CAST(maybe_allocation_site); |
| TNode<JSArray> boilerplate = CAST(LoadBoilerplate(allocation_site)); |
| |
| ParameterMode mode = OptimalParameterMode(); |
| if (allocation_site_mode == TRACK_ALLOCATION_SITE) { |
| return CloneFastJSArray(context, boilerplate, mode, allocation_site); |
| } else { |
| return CloneFastJSArray(context, boilerplate, mode); |
| } |
| } |
| |
| TF_BUILTIN(CreateShallowArrayLiteral, ConstructorBuiltinsAssembler) { |
| Node* feedback_vector = Parameter(Descriptor::kFeedbackVector); |
| Node* slot = SmiUntag(Parameter(Descriptor::kSlot)); |
| Node* constant_elements = Parameter(Descriptor::kConstantElements); |
| Node* context = Parameter(Descriptor::kContext); |
| Label call_runtime(this, Label::kDeferred); |
| Return(EmitCreateShallowArrayLiteral(feedback_vector, slot, context, |
| &call_runtime, |
| DONT_TRACK_ALLOCATION_SITE)); |
| |
| BIND(&call_runtime); |
| { |
| Comment("call runtime"); |
| int const flags = |
| AggregateLiteral::kDisableMementos | AggregateLiteral::kIsShallow; |
| Return(CallRuntime(Runtime::kCreateArrayLiteral, context, feedback_vector, |
| SmiTag(slot), constant_elements, SmiConstant(flags))); |
| } |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitCreateEmptyArrayLiteral( |
| Node* feedback_vector, Node* slot, Node* context) { |
| // Array literals always have a valid AllocationSite to properly track |
| // elements transitions. |
| TNode<Object> maybe_allocation_site = |
| CAST(LoadFeedbackVectorSlot(feedback_vector, slot, 0, INTPTR_PARAMETERS)); |
| TVARIABLE(AllocationSite, allocation_site); |
| |
| Label create_empty_array(this), |
| initialize_allocation_site(this, Label::kDeferred), done(this); |
| GotoIf(TaggedIsSmi(maybe_allocation_site), &initialize_allocation_site); |
| { |
| allocation_site = CAST(maybe_allocation_site); |
| Goto(&create_empty_array); |
| } |
| // TODO(cbruni): create the AllocationSite in CSA. |
| BIND(&initialize_allocation_site); |
| { |
| allocation_site = |
| CreateAllocationSiteInFeedbackVector(feedback_vector, SmiTag(slot)); |
| Goto(&create_empty_array); |
| } |
| |
| BIND(&create_empty_array); |
| TNode<Int32T> kind = LoadElementsKind(allocation_site.value()); |
| TNode<Context> native_context = LoadNativeContext(context); |
| Comment("LoadJSArrayElementsMap"); |
| Node* array_map = LoadJSArrayElementsMap(kind, native_context); |
| Node* zero = SmiConstant(0); |
| Comment("Allocate JSArray"); |
| Node* result = |
| AllocateJSArray(GetInitialFastElementsKind(), array_map, zero, zero, |
| allocation_site.value(), ParameterMode::SMI_PARAMETERS); |
| |
| Goto(&done); |
| BIND(&done); |
| |
| return result; |
| } |
| |
| TF_BUILTIN(CreateEmptyArrayLiteral, ConstructorBuiltinsAssembler) { |
| Node* feedback_vector = Parameter(Descriptor::kFeedbackVector); |
| Node* slot = SmiUntag(Parameter(Descriptor::kSlot)); |
| Node* context = Parameter(Descriptor::kContext); |
| Node* result = EmitCreateEmptyArrayLiteral(feedback_vector, slot, context); |
| Return(result); |
| } |
| |
| Node* ConstructorBuiltinsAssembler::EmitCreateShallowObjectLiteral( |
| Node* feedback_vector, Node* slot, Label* call_runtime) { |
| TNode<Object> maybe_allocation_site = |
| CAST(LoadFeedbackVectorSlot(feedback_vector, slot, 0, INTPTR_PARAMETERS)); |
| GotoIf(NotHasBoilerplate(maybe_allocation_site), call_runtime); |
| |
| TNode<AllocationSite> allocation_site = CAST(maybe_allocation_site); |
| TNode<JSObject> boilerplate = LoadBoilerplate(allocation_site); |
| TNode<Map> boilerplate_map = LoadMap(boilerplate); |
| CSA_ASSERT(this, IsJSObjectMap(boilerplate_map)); |
| |
| VARIABLE(var_properties, MachineRepresentation::kTagged); |
| { |
| Node* bit_field_3 = LoadMapBitField3(boilerplate_map); |
| GotoIf(IsSetWord32<Map::IsDeprecatedBit>(bit_field_3), call_runtime); |
| // Directly copy over the property store for dict-mode boilerplates. |
| Label if_dictionary(this), if_fast(this), done(this); |
| Branch(IsSetWord32<Map::IsDictionaryMapBit>(bit_field_3), &if_dictionary, |
| &if_fast); |
| BIND(&if_dictionary); |
| { |
| Comment("Copy dictionary properties"); |
| var_properties.Bind(CopyNameDictionary( |
| CAST(LoadSlowProperties(boilerplate)), call_runtime)); |
| // Slow objects have no in-object properties. |
| Goto(&done); |
| } |
| BIND(&if_fast); |
| { |
| // TODO(cbruni): support copying out-of-object properties. |
| Node* boilerplate_properties = LoadFastProperties(boilerplate); |
| GotoIfNot(IsEmptyFixedArray(boilerplate_properties), call_runtime); |
| var_properties.Bind(EmptyFixedArrayConstant()); |
| Goto(&done); |
| } |
| BIND(&done); |
| } |
| |
| VARIABLE(var_elements, MachineRepresentation::kTagged); |
| { |
| // Copy the elements backing store, assuming that it's flat. |
| Label if_empty_fixed_array(this), if_copy_elements(this), done(this); |
| Node* boilerplate_elements = LoadElements(boilerplate); |
| Branch(IsEmptyFixedArray(boilerplate_elements), &if_empty_fixed_array, |
| &if_copy_elements); |
| |
| BIND(&if_empty_fixed_array); |
| var_elements.Bind(boilerplate_elements); |
| Goto(&done); |
| |
| BIND(&if_copy_elements); |
| CSA_ASSERT(this, Word32BinaryNot( |
| IsFixedCOWArrayMap(LoadMap(boilerplate_elements)))); |
| ExtractFixedArrayFlags flags; |
| flags |= ExtractFixedArrayFlag::kAllFixedArrays; |
| flags |= ExtractFixedArrayFlag::kNewSpaceAllocationOnly; |
| flags |= ExtractFixedArrayFlag::kDontCopyCOW; |
| var_elements.Bind(CloneFixedArray(boilerplate_elements, flags)); |
| Goto(&done); |
| BIND(&done); |
| } |
| |
| // Ensure new-space allocation for a fresh JSObject so we can skip write |
| // barriers when copying all object fields. |
| STATIC_ASSERT(JSObject::kMaxInstanceSize < kMaxRegularHeapObjectSize); |
| Node* instance_size = |
| TimesPointerSize(LoadMapInstanceSizeInWords(boilerplate_map)); |
| Node* allocation_size = instance_size; |
| bool needs_allocation_memento = FLAG_allocation_site_pretenuring; |
| if (needs_allocation_memento) { |
| // Prepare for inner-allocating the AllocationMemento. |
| allocation_size = |
| IntPtrAdd(instance_size, IntPtrConstant(AllocationMemento::kSize)); |
| } |
| |
| Node* copy = AllocateInNewSpace(allocation_size); |
| { |
| Comment("Initialize Literal Copy"); |
| // Initialize Object fields. |
| StoreMapNoWriteBarrier(copy, boilerplate_map); |
| StoreObjectFieldNoWriteBarrier(copy, JSObject::kPropertiesOrHashOffset, |
| var_properties.value()); |
| StoreObjectFieldNoWriteBarrier(copy, JSObject::kElementsOffset, |
| var_elements.value()); |
| } |
| |
| // Initialize the AllocationMemento before potential GCs due to heap number |
| // allocation when copying the in-object properties. |
| if (needs_allocation_memento) { |
| InitializeAllocationMemento(copy, instance_size, allocation_site); |
| } |
| |
| { |
| // Copy over in-object properties. |
| Label continue_with_write_barrier(this), done_init(this); |
| VARIABLE(offset, MachineType::PointerRepresentation(), |
| IntPtrConstant(JSObject::kHeaderSize)); |
| // Mutable heap numbers only occur on 32-bit platforms. |
| bool may_use_mutable_heap_numbers = |
| FLAG_track_double_fields && !FLAG_unbox_double_fields; |
| { |
| Comment("Copy in-object properties fast"); |
| Label continue_fast(this, &offset); |
| Branch(WordEqual(offset.value(), instance_size), &done_init, |
| &continue_fast); |
| BIND(&continue_fast); |
| Node* field = LoadObjectField(boilerplate, offset.value()); |
| if (may_use_mutable_heap_numbers) { |
| Label store_field(this); |
| GotoIf(TaggedIsSmi(field), &store_field); |
| GotoIf(IsMutableHeapNumber(field), &continue_with_write_barrier); |
| Goto(&store_field); |
| BIND(&store_field); |
| } |
| StoreObjectFieldNoWriteBarrier(copy, offset.value(), field); |
| offset.Bind(IntPtrAdd(offset.value(), IntPtrConstant(kPointerSize))); |
| Branch(WordNotEqual(offset.value(), instance_size), &continue_fast, |
| &done_init); |
| } |
| |
| if (!may_use_mutable_heap_numbers) { |
| BIND(&done_init); |
| return copy; |
| } |
| // Continue initializing the literal after seeing the first sub-object |
| // potentially causing allocation. In this case we prepare the new literal |
| // by copying all pending fields over from the boilerplate and emit full |
| // write barriers from here on. |
| BIND(&continue_with_write_barrier); |
| { |
| Comment("Copy in-object properties slow"); |
| BuildFastLoop(offset.value(), instance_size, |
| [=](Node* offset) { |
| Node* field = LoadObjectField(boilerplate, offset); |
| StoreObjectFieldNoWriteBarrier(copy, offset, field); |
| }, |
| kPointerSize, INTPTR_PARAMETERS, IndexAdvanceMode::kPost); |
| Comment("Copy mutable HeapNumber values"); |
| BuildFastLoop(offset.value(), instance_size, |
| [=](Node* offset) { |
| Node* field = LoadObjectField(copy, offset); |
| Label copy_mutable_heap_number(this, Label::kDeferred), |
| continue_loop(this); |
| // We only have to clone complex field values. |
| GotoIf(TaggedIsSmi(field), &continue_loop); |
| Branch(IsMutableHeapNumber(field), |
| ©_mutable_heap_number, &continue_loop); |
| BIND(©_mutable_heap_number); |
| { |
| Node* double_value = LoadHeapNumberValue(field); |
| Node* mutable_heap_number = |
| AllocateMutableHeapNumberWithValue(double_value); |
| StoreObjectField(copy, offset, mutable_heap_number); |
| Goto(&continue_loop); |
| } |
| BIND(&continue_loop); |
| }, |
| kPointerSize, INTPTR_PARAMETERS, IndexAdvanceMode::kPost); |
| Goto(&done_init); |
| } |
| BIND(&done_init); |
| } |
| return copy; |
| } |
| |
| TF_BUILTIN(CreateShallowObjectLiteral, ConstructorBuiltinsAssembler) { |
| Label call_runtime(this); |
| Node* feedback_vector = Parameter(Descriptor::kFeedbackVector); |
| Node* slot = SmiUntag(Parameter(Descriptor::kSlot)); |
| Node* copy = |
| EmitCreateShallowObjectLiteral(feedback_vector, slot, &call_runtime); |
| Return(copy); |
| |
| BIND(&call_runtime); |
| Node* object_boilerplate_description = |
| Parameter(Descriptor::kObjectBoilerplateDescription); |
| Node* flags = Parameter(Descriptor::kFlags); |
| Node* context = Parameter(Descriptor::kContext); |
| TailCallRuntime(Runtime::kCreateObjectLiteral, context, feedback_vector, |
| SmiTag(slot), object_boilerplate_description, flags); |
| } |
| |
| // Used by the CreateEmptyObjectLiteral bytecode and the Object constructor. |
| Node* ConstructorBuiltinsAssembler::EmitCreateEmptyObjectLiteral( |
| Node* context) { |
| Node* native_context = LoadNativeContext(context); |
| Node* object_function = |
| LoadContextElement(native_context, Context::OBJECT_FUNCTION_INDEX); |
| Node* map = LoadObjectField(object_function, |
| JSFunction::kPrototypeOrInitialMapOffset); |
| CSA_ASSERT(this, IsMap(map)); |
| // Ensure that slack tracking is disabled for the map. |
| STATIC_ASSERT(Map::kNoSlackTracking == 0); |
| CSA_ASSERT( |
| this, IsClearWord32<Map::ConstructionCounterBits>(LoadMapBitField3(map))); |
| Node* empty_fixed_array = EmptyFixedArrayConstant(); |
| Node* result = |
| AllocateJSObjectFromMap(map, empty_fixed_array, empty_fixed_array); |
| return result; |
| } |
| |
| // ES #sec-object-constructor |
| TF_BUILTIN(ObjectConstructor, ConstructorBuiltinsAssembler) { |
| int const kValueArg = 0; |
| Node* argc = |
| ChangeInt32ToIntPtr(Parameter(Descriptor::kJSActualArgumentsCount)); |
| CodeStubArguments args(this, argc); |
| Node* context = Parameter(Descriptor::kContext); |
| Node* new_target = Parameter(Descriptor::kJSNewTarget); |
| |
| VARIABLE(var_result, MachineRepresentation::kTagged); |
| Label if_subclass(this, Label::kDeferred), if_notsubclass(this), |
| return_result(this); |
| GotoIf(IsUndefined(new_target), &if_notsubclass); |
| TNode<JSFunction> target = CAST(Parameter(Descriptor::kJSTarget)); |
| Branch(WordEqual(new_target, target), &if_notsubclass, &if_subclass); |
| |
| BIND(&if_subclass); |
| { |
| Node* result = |
| CallBuiltin(Builtins::kFastNewObject, context, target, new_target); |
| var_result.Bind(result); |
| Goto(&return_result); |
| } |
| |
| BIND(&if_notsubclass); |
| { |
| Label if_newobject(this, Label::kDeferred), if_toobject(this); |
| |
| Node* value_index = IntPtrConstant(kValueArg); |
| GotoIf(UintPtrGreaterThanOrEqual(value_index, argc), &if_newobject); |
| Node* value = args.AtIndex(value_index); |
| GotoIf(IsNull(value), &if_newobject); |
| Branch(IsUndefined(value), &if_newobject, &if_toobject); |
| |
| BIND(&if_newobject); |
| { |
| Node* result = EmitCreateEmptyObjectLiteral(context); |
| var_result.Bind(result); |
| Goto(&return_result); |
| } |
| |
| BIND(&if_toobject); |
| { |
| Node* result = CallBuiltin(Builtins::kToObject, context, value); |
| var_result.Bind(result); |
| Goto(&return_result); |
| } |
| } |
| |
| BIND(&return_result); |
| args.PopAndReturn(var_result.value()); |
| } |
| |
| // ES #sec-number-constructor |
| TF_BUILTIN(NumberConstructor, ConstructorBuiltinsAssembler) { |
| Node* context = Parameter(Descriptor::kContext); |
| Node* argc = |
| ChangeInt32ToIntPtr(Parameter(Descriptor::kJSActualArgumentsCount)); |
| CodeStubArguments args(this, argc); |
| |
| // 1. If no arguments were passed to this function invocation, let n be +0. |
| VARIABLE(var_n, MachineRepresentation::kTagged, SmiConstant(0)); |
| Label if_nloaded(this, &var_n); |
| GotoIf(WordEqual(argc, IntPtrConstant(0)), &if_nloaded); |
| |
| // 2. Else, |
| // a. Let prim be ? ToNumeric(value). |
| // b. If Type(prim) is BigInt, let n be the Number value for prim. |
| // c. Otherwise, let n be prim. |
| Node* value = args.AtIndex(0); |
| var_n.Bind(ToNumber(context, value, BigIntHandling::kConvertToNumber)); |
| Goto(&if_nloaded); |
| |
| BIND(&if_nloaded); |
| { |
| // 3. If NewTarget is undefined, return n. |
| Node* n_value = var_n.value(); |
| Node* new_target = Parameter(Descriptor::kJSNewTarget); |
| Label return_n(this), constructnumber(this, Label::kDeferred); |
| Branch(IsUndefined(new_target), &return_n, &constructnumber); |
| |
| BIND(&return_n); |
| { args.PopAndReturn(n_value); } |
| |
| BIND(&constructnumber); |
| { |
| // 4. Let O be ? OrdinaryCreateFromConstructor(NewTarget, |
| // "%NumberPrototype%", « [[NumberData]] »). |
| // 5. Set O.[[NumberData]] to n. |
| // 6. Return O. |
| |
| // We are not using Parameter(Descriptor::kJSTarget) and loading the value |
| // from the current frame here in order to reduce register pressure on the |
| // fast path. |
| TNode<JSFunction> target = LoadTargetFromFrame(); |
| Node* result = |
| CallBuiltin(Builtins::kFastNewObject, context, target, new_target); |
| StoreObjectField(result, JSValue::kValueOffset, n_value); |
| args.PopAndReturn(result); |
| } |
| } |
| } |
| |
| TF_BUILTIN(GenericConstructorLazyDeoptContinuation, |
| ConstructorBuiltinsAssembler) { |
| Node* result = Parameter(Descriptor::kResult); |
| Return(result); |
| } |
| |
| // https://tc39.github.io/ecma262/#sec-string-constructor |
| TF_BUILTIN(StringConstructor, ConstructorBuiltinsAssembler) { |
| Node* context = Parameter(Descriptor::kContext); |
| Node* argc = |
| ChangeInt32ToIntPtr(Parameter(Descriptor::kJSActualArgumentsCount)); |
| CodeStubArguments args(this, argc); |
| |
| TNode<Object> new_target = CAST(Parameter(Descriptor::kJSNewTarget)); |
| |
| // 1. If no arguments were passed to this function invocation, let s be "". |
| VARIABLE(var_s, MachineRepresentation::kTagged, EmptyStringConstant()); |
| Label if_sloaded(this, &var_s); |
| GotoIf(WordEqual(argc, IntPtrConstant(0)), &if_sloaded); |
| |
| // 2. Else, |
| // a. If NewTarget is undefined [...] |
| Node* value = args.AtIndex(0); |
| Label if_tostring(this, &var_s); |
| GotoIfNot(IsUndefined(new_target), &if_tostring); |
| |
| // 2a. [...] and Type(value) is Symbol, return SymbolDescriptiveString(value). |
| GotoIf(TaggedIsSmi(value), &if_tostring); |
| GotoIfNot(IsSymbol(value), &if_tostring); |
| { |
| Node* result = |
| CallRuntime(Runtime::kSymbolDescriptiveString, context, value); |
| args.PopAndReturn(result); |
| } |
| |
| // 2b. Let s be ? ToString(value). |
| BIND(&if_tostring); |
| { |
| var_s.Bind(CallBuiltin(Builtins::kToString, context, value)); |
| Goto(&if_sloaded); |
| } |
| |
| // 3. If NewTarget is undefined, return s. |
| BIND(&if_sloaded); |
| { |
| Node* s_value = var_s.value(); |
| Label return_s(this), constructstring(this, Label::kDeferred); |
| Branch(IsUndefined(new_target), &return_s, &constructstring); |
| |
| BIND(&return_s); |
| { args.PopAndReturn(s_value); } |
| |
| BIND(&constructstring); |
| { |
| // We are not using Parameter(Descriptor::kJSTarget) and loading the value |
| // from the current frame here in order to reduce register pressure on the |
| // fast path. |
| TNode<JSFunction> target = LoadTargetFromFrame(); |
| |
| Node* result = |
| CallBuiltin(Builtins::kFastNewObject, context, target, new_target); |
| StoreObjectField(result, JSValue::kValueOffset, s_value); |
| args.PopAndReturn(result); |
| } |
| } |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
