| // Copyright 2014 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/runtime/runtime-utils.h" |
| |
| #include "src/allocation-site-scopes.h" |
| #include "src/arguments.h" |
| #include "src/ast/ast.h" |
| #include "src/ast/compile-time-value.h" |
| #include "src/isolate-inl.h" |
| #include "src/runtime/runtime.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| namespace { |
| |
| bool IsUninitializedLiteralSite(Object* literal_site) { |
| return literal_site == Smi::kZero; |
| } |
| |
| bool HasBoilerplate(Isolate* isolate, Handle<Object> literal_site) { |
| return !literal_site->IsSmi(); |
| } |
| |
| void PreInitializeLiteralSite(Handle<FeedbackVector> vector, |
| FeedbackSlot slot) { |
| vector->Set(slot, Smi::FromInt(1)); |
| } |
| |
| Handle<Object> InnerCreateBoilerplate(Isolate* isolate, |
| Handle<FixedArray> compile_time_value, |
| PretenureFlag pretenure_flag); |
| |
| enum DeepCopyHints { kNoHints = 0, kObjectIsShallow = 1 }; |
| |
| template <class ContextObject> |
| class JSObjectWalkVisitor { |
| public: |
| JSObjectWalkVisitor(ContextObject* site_context, DeepCopyHints hints) |
| : site_context_(site_context), hints_(hints) {} |
| |
| MUST_USE_RESULT MaybeHandle<JSObject> StructureWalk(Handle<JSObject> object); |
| |
| protected: |
| MUST_USE_RESULT inline MaybeHandle<JSObject> VisitElementOrProperty( |
| Handle<JSObject> object, Handle<JSObject> value) { |
| Handle<AllocationSite> current_site = site_context()->EnterNewScope(); |
| MaybeHandle<JSObject> copy_of_value = StructureWalk(value); |
| site_context()->ExitScope(current_site, value); |
| return copy_of_value; |
| } |
| |
| inline ContextObject* site_context() { return site_context_; } |
| inline Isolate* isolate() { return site_context()->isolate(); } |
| |
| private: |
| ContextObject* site_context_; |
| const DeepCopyHints hints_; |
| }; |
| |
| template <class ContextObject> |
| MaybeHandle<JSObject> JSObjectWalkVisitor<ContextObject>::StructureWalk( |
| Handle<JSObject> object) { |
| Isolate* isolate = this->isolate(); |
| bool copying = ContextObject::kCopying; |
| bool shallow = hints_ == kObjectIsShallow; |
| |
| if (!shallow) { |
| StackLimitCheck check(isolate); |
| |
| if (check.HasOverflowed()) { |
| isolate->StackOverflow(); |
| return MaybeHandle<JSObject>(); |
| } |
| } |
| |
| if (object->map()->is_deprecated()) { |
| JSObject::MigrateInstance(object); |
| } |
| |
| Handle<JSObject> copy; |
| if (copying) { |
| // JSFunction objects are not allowed to be in normal boilerplates at all. |
| DCHECK(!object->IsJSFunction()); |
| Handle<AllocationSite> site_to_pass; |
| if (site_context()->ShouldCreateMemento(object)) { |
| site_to_pass = site_context()->current(); |
| } |
| copy = isolate->factory()->CopyJSObjectWithAllocationSite(object, |
| site_to_pass); |
| } else { |
| copy = object; |
| } |
| |
| DCHECK(copying || copy.is_identical_to(object)); |
| |
| if (shallow) return copy; |
| |
| HandleScope scope(isolate); |
| |
| // Deep copy own properties. Arrays only have 1 property "length". |
| if (!copy->IsJSArray()) { |
| if (copy->HasFastProperties()) { |
| Handle<DescriptorArray> descriptors(copy->map()->instance_descriptors()); |
| int limit = copy->map()->NumberOfOwnDescriptors(); |
| for (int i = 0; i < limit; i++) { |
| DCHECK_EQ(kField, descriptors->GetDetails(i).location()); |
| DCHECK_EQ(kData, descriptors->GetDetails(i).kind()); |
| FieldIndex index = FieldIndex::ForDescriptor(copy->map(), i); |
| if (copy->IsUnboxedDoubleField(index)) continue; |
| Object* raw = copy->RawFastPropertyAt(index); |
| if (raw->IsJSObject()) { |
| Handle<JSObject> value(JSObject::cast(raw), isolate); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, VisitElementOrProperty(copy, value), JSObject); |
| if (copying) copy->FastPropertyAtPut(index, *value); |
| } else if (copying && raw->IsMutableHeapNumber()) { |
| DCHECK(descriptors->GetDetails(i).representation().IsDouble()); |
| uint64_t double_value = HeapNumber::cast(raw)->value_as_bits(); |
| Handle<HeapNumber> value = isolate->factory()->NewHeapNumber(MUTABLE); |
| value->set_value_as_bits(double_value); |
| copy->FastPropertyAtPut(index, *value); |
| } |
| } |
| } else { |
| Handle<NameDictionary> dict(copy->property_dictionary()); |
| for (int i = 0; i < dict->Capacity(); i++) { |
| Object* raw = dict->ValueAt(i); |
| if (!raw->IsJSObject()) continue; |
| DCHECK(dict->KeyAt(i)->IsName()); |
| Handle<JSObject> value(JSObject::cast(raw), isolate); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, VisitElementOrProperty(copy, value), JSObject); |
| if (copying) dict->ValueAtPut(i, *value); |
| } |
| } |
| |
| // Assume non-arrays don't end up having elements. |
| if (copy->elements()->length() == 0) return copy; |
| } |
| |
| // Deep copy own elements. |
| switch (copy->GetElementsKind()) { |
| case PACKED_ELEMENTS: |
| case HOLEY_ELEMENTS: { |
| Handle<FixedArray> elements(FixedArray::cast(copy->elements())); |
| if (elements->map() == isolate->heap()->fixed_cow_array_map()) { |
| #ifdef DEBUG |
| for (int i = 0; i < elements->length(); i++) { |
| DCHECK(!elements->get(i)->IsJSObject()); |
| } |
| #endif |
| } else { |
| for (int i = 0; i < elements->length(); i++) { |
| Object* raw = elements->get(i); |
| if (!raw->IsJSObject()) continue; |
| Handle<JSObject> value(JSObject::cast(raw), isolate); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, VisitElementOrProperty(copy, value), JSObject); |
| if (copying) elements->set(i, *value); |
| } |
| } |
| break; |
| } |
| case DICTIONARY_ELEMENTS: { |
| Handle<NumberDictionary> element_dictionary(copy->element_dictionary()); |
| int capacity = element_dictionary->Capacity(); |
| for (int i = 0; i < capacity; i++) { |
| Object* raw = element_dictionary->ValueAt(i); |
| if (!raw->IsJSObject()) continue; |
| Handle<JSObject> value(JSObject::cast(raw), isolate); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, VisitElementOrProperty(copy, value), JSObject); |
| if (copying) element_dictionary->ValueAtPut(i, *value); |
| } |
| break; |
| } |
| case FAST_SLOPPY_ARGUMENTS_ELEMENTS: |
| case SLOW_SLOPPY_ARGUMENTS_ELEMENTS: |
| UNIMPLEMENTED(); |
| break; |
| case FAST_STRING_WRAPPER_ELEMENTS: |
| case SLOW_STRING_WRAPPER_ELEMENTS: |
| UNREACHABLE(); |
| break; |
| |
| #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) case TYPE##_ELEMENTS: |
| |
| TYPED_ARRAYS(TYPED_ARRAY_CASE) |
| #undef TYPED_ARRAY_CASE |
| // Typed elements cannot be created using an object literal. |
| UNREACHABLE(); |
| break; |
| |
| case PACKED_SMI_ELEMENTS: |
| case HOLEY_SMI_ELEMENTS: |
| case PACKED_DOUBLE_ELEMENTS: |
| case HOLEY_DOUBLE_ELEMENTS: |
| case NO_ELEMENTS: |
| // No contained objects, nothing to do. |
| break; |
| } |
| |
| return copy; |
| } |
| |
| class DeprecationUpdateContext { |
| public: |
| explicit DeprecationUpdateContext(Isolate* isolate) { isolate_ = isolate; } |
| Isolate* isolate() { return isolate_; } |
| bool ShouldCreateMemento(Handle<JSObject> object) { return false; } |
| inline void ExitScope(Handle<AllocationSite> scope_site, |
| Handle<JSObject> object) {} |
| Handle<AllocationSite> EnterNewScope() { return Handle<AllocationSite>(); } |
| Handle<AllocationSite> current() { |
| UNREACHABLE(); |
| return Handle<AllocationSite>(); |
| } |
| |
| static const bool kCopying = false; |
| |
| private: |
| Isolate* isolate_; |
| }; |
| |
| // AllocationSiteCreationContext aids in the creation of AllocationSites to |
| // accompany object literals. |
| class AllocationSiteCreationContext : public AllocationSiteContext { |
| public: |
| explicit AllocationSiteCreationContext(Isolate* isolate) |
| : AllocationSiteContext(isolate) {} |
| |
| Handle<AllocationSite> EnterNewScope() { |
| Handle<AllocationSite> scope_site; |
| if (top().is_null()) { |
| // We are creating the top level AllocationSite as opposed to a nested |
| // AllocationSite. |
| InitializeTraversal(isolate()->factory()->NewAllocationSite()); |
| scope_site = Handle<AllocationSite>(*top(), isolate()); |
| if (FLAG_trace_creation_allocation_sites) { |
| PrintF("*** Creating top level AllocationSite %p\n", |
| static_cast<void*>(*scope_site)); |
| } |
| } else { |
| DCHECK(!current().is_null()); |
| scope_site = isolate()->factory()->NewAllocationSite(); |
| if (FLAG_trace_creation_allocation_sites) { |
| PrintF("Creating nested site (top, current, new) (%p, %p, %p)\n", |
| static_cast<void*>(*top()), static_cast<void*>(*current()), |
| static_cast<void*>(*scope_site)); |
| } |
| current()->set_nested_site(*scope_site); |
| update_current_site(*scope_site); |
| } |
| DCHECK(!scope_site.is_null()); |
| return scope_site; |
| } |
| void ExitScope(Handle<AllocationSite> scope_site, Handle<JSObject> object) { |
| if (object.is_null()) return; |
| scope_site->set_boilerplate(*object); |
| if (FLAG_trace_creation_allocation_sites) { |
| bool top_level = |
| !scope_site.is_null() && top().is_identical_to(scope_site); |
| if (top_level) { |
| PrintF("*** Setting AllocationSite %p transition_info %p\n", |
| static_cast<void*>(*scope_site), static_cast<void*>(*object)); |
| } else { |
| PrintF("Setting AllocationSite (%p, %p) transition_info %p\n", |
| static_cast<void*>(*top()), static_cast<void*>(*scope_site), |
| static_cast<void*>(*object)); |
| } |
| } |
| } |
| static const bool kCopying = false; |
| }; |
| |
| MaybeHandle<JSObject> DeepWalk(Handle<JSObject> object, |
| DeprecationUpdateContext* site_context) { |
| JSObjectWalkVisitor<DeprecationUpdateContext> v(site_context, kNoHints); |
| MaybeHandle<JSObject> result = v.StructureWalk(object); |
| Handle<JSObject> for_assert; |
| DCHECK(!result.ToHandle(&for_assert) || for_assert.is_identical_to(object)); |
| return result; |
| } |
| |
| MaybeHandle<JSObject> DeepWalk(Handle<JSObject> object, |
| AllocationSiteCreationContext* site_context) { |
| JSObjectWalkVisitor<AllocationSiteCreationContext> v(site_context, kNoHints); |
| MaybeHandle<JSObject> result = v.StructureWalk(object); |
| Handle<JSObject> for_assert; |
| DCHECK(!result.ToHandle(&for_assert) || for_assert.is_identical_to(object)); |
| return result; |
| } |
| |
| MaybeHandle<JSObject> DeepCopy(Handle<JSObject> object, |
| AllocationSiteUsageContext* site_context, |
| DeepCopyHints hints) { |
| JSObjectWalkVisitor<AllocationSiteUsageContext> v(site_context, hints); |
| MaybeHandle<JSObject> copy = v.StructureWalk(object); |
| Handle<JSObject> for_assert; |
| DCHECK(!copy.ToHandle(&for_assert) || !for_assert.is_identical_to(object)); |
| return copy; |
| } |
| |
| struct ObjectBoilerplate { |
| static Handle<JSObject> Create(Isolate* isolate, |
| Handle<HeapObject> description, int flags, |
| PretenureFlag pretenure_flag) { |
| Handle<Context> native_context = isolate->native_context(); |
| Handle<BoilerplateDescription> boilerplate_description = |
| Handle<BoilerplateDescription>::cast(description); |
| bool use_fast_elements = (flags & ObjectLiteral::kFastElements) != 0; |
| bool has_null_prototype = (flags & ObjectLiteral::kHasNullPrototype) != 0; |
| |
| // In case we have function literals, we want the object to be in |
| // slow properties mode for now. We don't go in the map cache because |
| // maps with constant functions can't be shared if the functions are |
| // not the same (which is the common case). |
| int number_of_properties = boilerplate_description->backing_store_size(); |
| |
| // Ignoring number_of_properties for force dictionary map with |
| // __proto__:null. |
| Handle<Map> map = |
| has_null_prototype |
| ? handle(native_context->slow_object_with_null_prototype_map(), |
| isolate) |
| : isolate->factory()->ObjectLiteralMapFromCache( |
| native_context, number_of_properties); |
| |
| Handle<JSObject> boilerplate = |
| map->is_dictionary_map() |
| ? isolate->factory()->NewSlowJSObjectFromMap( |
| map, number_of_properties, pretenure_flag) |
| : isolate->factory()->NewJSObjectFromMap(map, pretenure_flag); |
| |
| // Normalize the elements of the boilerplate to save space if needed. |
| if (!use_fast_elements) JSObject::NormalizeElements(boilerplate); |
| |
| // Add the constant properties to the boilerplate. |
| int length = boilerplate_description->size(); |
| // TODO(verwaest): Support tracking representations in the boilerplate. |
| for (int index = 0; index < length; index++) { |
| Handle<Object> key(boilerplate_description->name(index), isolate); |
| Handle<Object> value(boilerplate_description->value(index), isolate); |
| if (value->IsFixedArray()) { |
| // The value contains the CompileTimeValue with the boilerplate |
| // properties of a simple object or array literal. |
| Handle<FixedArray> compile_time_value = Handle<FixedArray>::cast(value); |
| value = |
| InnerCreateBoilerplate(isolate, compile_time_value, pretenure_flag); |
| } |
| uint32_t element_index = 0; |
| if (key->ToArrayIndex(&element_index)) { |
| // Array index (uint32). |
| if (value->IsUninitialized(isolate)) { |
| value = handle(Smi::kZero, isolate); |
| } |
| JSObject::SetOwnElementIgnoreAttributes(boilerplate, element_index, |
| value, NONE) |
| .Check(); |
| } else { |
| Handle<String> name = Handle<String>::cast(key); |
| DCHECK(!name->AsArrayIndex(&element_index)); |
| JSObject::SetOwnPropertyIgnoreAttributes(boilerplate, name, value, NONE) |
| .Check(); |
| } |
| } |
| |
| if (map->is_dictionary_map() && !has_null_prototype) { |
| // TODO(cbruni): avoid making the boilerplate fast again, the clone stub |
| // supports dict-mode objects directly. |
| JSObject::MigrateSlowToFast(boilerplate, |
| boilerplate->map()->UnusedPropertyFields(), |
| "FastLiteral"); |
| } |
| return boilerplate; |
| } |
| }; |
| |
| struct ArrayBoilerplate { |
| static Handle<JSObject> Create(Isolate* isolate, |
| Handle<HeapObject> description, int flags, |
| PretenureFlag pretenure_flag) { |
| Handle<ConstantElementsPair> elements = |
| Handle<ConstantElementsPair>::cast(description); |
| // Create the JSArray. |
| ElementsKind constant_elements_kind = |
| static_cast<ElementsKind>(elements->elements_kind()); |
| |
| Handle<FixedArrayBase> constant_elements_values( |
| elements->constant_values()); |
| Handle<FixedArrayBase> copied_elements_values; |
| if (IsDoubleElementsKind(constant_elements_kind)) { |
| copied_elements_values = isolate->factory()->CopyFixedDoubleArray( |
| Handle<FixedDoubleArray>::cast(constant_elements_values)); |
| } else { |
| DCHECK(IsSmiOrObjectElementsKind(constant_elements_kind)); |
| const bool is_cow = (constant_elements_values->map() == |
| isolate->heap()->fixed_cow_array_map()); |
| if (is_cow) { |
| copied_elements_values = constant_elements_values; |
| #if DEBUG |
| Handle<FixedArray> fixed_array_values = |
| Handle<FixedArray>::cast(copied_elements_values); |
| for (int i = 0; i < fixed_array_values->length(); i++) { |
| DCHECK(!fixed_array_values->get(i)->IsFixedArray()); |
| } |
| #endif |
| } else { |
| Handle<FixedArray> fixed_array_values = |
| Handle<FixedArray>::cast(constant_elements_values); |
| Handle<FixedArray> fixed_array_values_copy = |
| isolate->factory()->CopyFixedArray(fixed_array_values); |
| copied_elements_values = fixed_array_values_copy; |
| FOR_WITH_HANDLE_SCOPE( |
| isolate, int, i = 0, i, i < fixed_array_values->length(), i++, { |
| if (fixed_array_values->get(i)->IsFixedArray()) { |
| // The value contains the CompileTimeValue with the |
| // boilerplate description of a simple object or |
| // array literal. |
| Handle<FixedArray> compile_time_value( |
| FixedArray::cast(fixed_array_values->get(i))); |
| Handle<Object> result = InnerCreateBoilerplate( |
| isolate, compile_time_value, pretenure_flag); |
| fixed_array_values_copy->set(i, *result); |
| } |
| }); |
| } |
| } |
| |
| return isolate->factory()->NewJSArrayWithElements( |
| copied_elements_values, constant_elements_kind, |
| copied_elements_values->length(), pretenure_flag); |
| } |
| }; |
| |
| Handle<Object> InnerCreateBoilerplate(Isolate* isolate, |
| Handle<FixedArray> compile_time_value, |
| PretenureFlag pretenure_flag) { |
| Handle<HeapObject> elements = |
| CompileTimeValue::GetElements(compile_time_value); |
| int flags = CompileTimeValue::GetLiteralTypeFlags(compile_time_value); |
| if (flags == CompileTimeValue::kArrayLiteralFlag) { |
| return ArrayBoilerplate::Create(isolate, elements, flags, pretenure_flag); |
| } |
| return ObjectBoilerplate::Create(isolate, elements, flags, pretenure_flag); |
| } |
| |
| template <typename Boilerplate> |
| MaybeHandle<JSObject> CreateLiteral(Isolate* isolate, |
| Handle<FeedbackVector> vector, |
| int literals_index, |
| Handle<HeapObject> description, int flags) { |
| FeedbackSlot literals_slot(FeedbackVector::ToSlot(literals_index)); |
| CHECK(literals_slot.ToInt() < vector->length()); |
| Handle<Object> literal_site(vector->Get(literals_slot), isolate); |
| DeepCopyHints copy_hints = |
| (flags & AggregateLiteral::kIsShallow) ? kObjectIsShallow : kNoHints; |
| if (FLAG_track_double_fields && !FLAG_unbox_double_fields) { |
| // Make sure we properly clone mutable heap numbers on 32-bit platforms. |
| copy_hints = kNoHints; |
| } |
| |
| Handle<AllocationSite> site; |
| Handle<JSObject> boilerplate; |
| |
| if (HasBoilerplate(isolate, literal_site)) { |
| site = Handle<AllocationSite>::cast(literal_site); |
| boilerplate = Handle<JSObject>(site->boilerplate(), isolate); |
| } else { |
| // Eagerly create AllocationSites for literals that contain an Array. |
| bool needs_initial_allocation_site = |
| (flags & AggregateLiteral::kNeedsInitialAllocationSite) != 0; |
| // TODO(cbruni): Even in the case where we need an initial allocation site |
| // we could still create the boilerplate lazily to save memory. |
| if (!needs_initial_allocation_site && |
| IsUninitializedLiteralSite(*literal_site)) { |
| PreInitializeLiteralSite(vector, literals_slot); |
| boilerplate = |
| Boilerplate::Create(isolate, description, flags, NOT_TENURED); |
| if (copy_hints == kNoHints) { |
| DeprecationUpdateContext update_context(isolate); |
| RETURN_ON_EXCEPTION(isolate, DeepWalk(boilerplate, &update_context), |
| JSObject); |
| } |
| return boilerplate; |
| } else { |
| PretenureFlag pretenure_flag = |
| isolate->heap()->InNewSpace(*vector) ? NOT_TENURED : TENURED; |
| boilerplate = |
| Boilerplate::Create(isolate, description, flags, pretenure_flag); |
| } |
| // Install AllocationSite objects. |
| AllocationSiteCreationContext creation_context(isolate); |
| site = creation_context.EnterNewScope(); |
| RETURN_ON_EXCEPTION(isolate, DeepWalk(boilerplate, &creation_context), |
| JSObject); |
| creation_context.ExitScope(site, boilerplate); |
| |
| vector->Set(literals_slot, *site); |
| } |
| |
| STATIC_ASSERT(static_cast<int>(ObjectLiteral::kDisableMementos) == |
| static_cast<int>(ArrayLiteral::kDisableMementos)); |
| bool enable_mementos = (flags & ObjectLiteral::kDisableMementos) == 0; |
| |
| // Copy the existing boilerplate. |
| AllocationSiteUsageContext usage_context(isolate, site, enable_mementos); |
| usage_context.EnterNewScope(); |
| MaybeHandle<JSObject> copy = |
| DeepCopy(boilerplate, &usage_context, copy_hints); |
| usage_context.ExitScope(site, boilerplate); |
| return copy; |
| } |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_CreateObjectLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 0); |
| CONVERT_SMI_ARG_CHECKED(literals_index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(BoilerplateDescription, description, 2); |
| CONVERT_SMI_ARG_CHECKED(flags, 3); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, CreateLiteral<ObjectBoilerplate>(isolate, vector, literals_index, |
| description, flags)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_CreateArrayLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 0); |
| CONVERT_SMI_ARG_CHECKED(literals_index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(ConstantElementsPair, elements, 2); |
| CONVERT_SMI_ARG_CHECKED(flags, 3); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, CreateLiteral<ArrayBoilerplate>(isolate, vector, literals_index, |
| elements, flags)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_CreateRegExpLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 0); |
| CONVERT_SMI_ARG_CHECKED(index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(String, pattern, 2); |
| CONVERT_SMI_ARG_CHECKED(flags, 3); |
| |
| FeedbackSlot literal_slot(FeedbackVector::ToSlot(index)); |
| |
| // Check if boilerplate exists. If not, create it first. |
| Handle<Object> literal_site(vector->Get(literal_slot), isolate); |
| Handle<Object> boilerplate; |
| if (!HasBoilerplate(isolate, literal_site)) { |
| ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| isolate, boilerplate, JSRegExp::New(pattern, JSRegExp::Flags(flags))); |
| if (IsUninitializedLiteralSite(*literal_site)) { |
| PreInitializeLiteralSite(vector, literal_slot); |
| return *boilerplate; |
| } |
| vector->Set(literal_slot, *boilerplate); |
| } |
| return *JSRegExp::Copy(Handle<JSRegExp>::cast(boilerplate)); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
