| // 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/ast/ast.h" |
| #include "src/common/globals.h" |
| #include "src/execution/arguments-inl.h" |
| #include "src/execution/isolate-inl.h" |
| #include "src/objects/allocation-site-scopes-inl.h" |
| #include "src/objects/hash-table-inl.h" |
| #include "src/objects/heap-number-inl.h" |
| #include "src/objects/js-regexp-inl.h" |
| #include "src/objects/literal-objects-inl.h" |
| #include "src/runtime/runtime.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| namespace { |
| |
| bool IsUninitializedLiteralSite(Tagged<Object> literal_site) { |
| return literal_site == Smi::zero(); |
| } |
| |
| bool HasBoilerplate(Handle<Object> literal_site) { |
| return !IsSmi(*literal_site); |
| } |
| |
| void PreInitializeLiteralSite(Handle<FeedbackVector> vector, |
| FeedbackSlot slot) { |
| vector->SynchronizedSet(slot, Smi::FromInt(1)); |
| } |
| |
| template <class ContextObject> |
| class JSObjectWalkVisitor { |
| public: |
| explicit JSObjectWalkVisitor(ContextObject* site_context) |
| : site_context_(site_context) {} |
| |
| V8_WARN_UNUSED_RESULT MaybeHandle<JSObject> StructureWalk( |
| Handle<JSObject> object); |
| |
| protected: |
| V8_WARN_UNUSED_RESULT inline MaybeHandle<JSObject> VisitElementOrProperty( |
| Handle<JSObject> object, Handle<JSObject> value) { |
| // Dont create allocation sites for nested object literals |
| if (!IsJSArray(*value)) { |
| return StructureWalk(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_; |
| }; |
| |
| template <class ContextObject> |
| MaybeHandle<JSObject> JSObjectWalkVisitor<ContextObject>::StructureWalk( |
| Handle<JSObject> object) { |
| Isolate* isolate = this->isolate(); |
| bool copying = ContextObject::kCopying; |
| |
| { |
| StackLimitCheck check(isolate); |
| |
| if (check.HasOverflowed()) { |
| isolate->StackOverflow(); |
| return MaybeHandle<JSObject>(); |
| } |
| } |
| |
| if (object->map(isolate)->is_deprecated()) { |
| base::SharedMutexGuard<base::kExclusive> mutex_guard( |
| isolate->boilerplate_migration_access()); |
| JSObject::MigrateInstance(isolate, object); |
| } |
| |
| Handle<JSObject> copy; |
| if (copying) { |
| // JSFunction objects are not allowed to be in normal boilerplates at all. |
| DCHECK(!IsJSFunction(*object, isolate)); |
| 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)); |
| |
| HandleScope scope(isolate); |
| |
| // Deep copy own properties. Arrays only have 1 property "length". |
| if (!IsJSArray(*copy, isolate)) { |
| if (copy->HasFastProperties(isolate)) { |
| Handle<DescriptorArray> descriptors( |
| copy->map(isolate)->instance_descriptors(isolate), isolate); |
| for (InternalIndex i : copy->map(isolate)->IterateOwnDescriptors()) { |
| PropertyDetails details = descriptors->GetDetails(i); |
| DCHECK_EQ(PropertyLocation::kField, details.location()); |
| DCHECK_EQ(PropertyKind::kData, details.kind()); |
| FieldIndex index = FieldIndex::ForPropertyIndex( |
| copy->map(isolate), details.field_index(), |
| details.representation()); |
| Tagged<Object> raw = copy->RawFastPropertyAt(isolate, index); |
| if (IsJSObject(raw, isolate)) { |
| 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 && details.representation().IsDouble()) { |
| uint64_t double_value = HeapNumber::cast(raw)->value_as_bits(); |
| auto value = isolate->factory()->NewHeapNumberFromBits(double_value); |
| copy->FastPropertyAtPut(index, *value); |
| } |
| } |
| } else { |
| if (V8_ENABLE_SWISS_NAME_DICTIONARY_BOOL) { |
| Handle<SwissNameDictionary> dict( |
| copy->property_dictionary_swiss(isolate), isolate); |
| for (InternalIndex i : dict->IterateEntries()) { |
| Tagged<Object> raw = dict->ValueAt(i); |
| if (!IsJSObject(raw, isolate)) continue; |
| DCHECK(IsName(dict->KeyAt(i))); |
| Handle<JSObject> value(JSObject::cast(raw), isolate); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, VisitElementOrProperty(copy, value), JSObject); |
| if (copying) dict->ValueAtPut(i, *value); |
| } |
| } else { |
| Handle<NameDictionary> dict(copy->property_dictionary(isolate), |
| isolate); |
| for (InternalIndex i : dict->IterateEntries()) { |
| Tagged<Object> raw = dict->ValueAt(isolate, i); |
| if (!IsJSObject(raw, isolate)) continue; |
| DCHECK(IsName(dict->KeyAt(isolate, i))); |
| 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(isolate)->length() == 0) return copy; |
| } |
| |
| // Deep copy own elements. |
| switch (copy->GetElementsKind(isolate)) { |
| case PACKED_ELEMENTS: |
| case PACKED_FROZEN_ELEMENTS: |
| case PACKED_SEALED_ELEMENTS: |
| case PACKED_NONEXTENSIBLE_ELEMENTS: |
| case HOLEY_FROZEN_ELEMENTS: |
| case HOLEY_SEALED_ELEMENTS: |
| case HOLEY_NONEXTENSIBLE_ELEMENTS: |
| case HOLEY_ELEMENTS: |
| case SHARED_ARRAY_ELEMENTS: { |
| Handle<FixedArray> elements(FixedArray::cast(copy->elements(isolate)), |
| isolate); |
| if (elements->map(isolate) == |
| ReadOnlyRoots(isolate).fixed_cow_array_map()) { |
| #ifdef DEBUG |
| for (int i = 0; i < elements->length(); i++) { |
| DCHECK(!IsJSObject(elements->get(i))); |
| } |
| #endif |
| } else { |
| for (int i = 0; i < elements->length(); i++) { |
| Tagged<Object> raw = elements->get(i); |
| if (!IsJSObject(raw, isolate)) 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(isolate), isolate); |
| for (InternalIndex i : element_dictionary->IterateEntries()) { |
| Tagged<Object> raw = element_dictionary->ValueAt(isolate, i); |
| if (!IsJSObject(raw, isolate)) 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: |
| case WASM_ARRAY_ELEMENTS: |
| UNREACHABLE(); |
| |
| #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype) case TYPE##_ELEMENTS: |
| |
| TYPED_ARRAYS(TYPED_ARRAY_CASE) |
| RAB_GSAB_TYPED_ARRAYS(TYPED_ARRAY_CASE) |
| #undef TYPED_ARRAY_CASE |
| // Typed elements cannot be created using an object literal. |
| UNREACHABLE(); |
| |
| 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(); |
| } |
| |
| 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(true)); |
| scope_site = Handle<AllocationSite>(*top(), isolate()); |
| if (v8_flags.trace_creation_allocation_sites) { |
| PrintF("*** Creating top level %s AllocationSite %p\n", "Fat", |
| reinterpret_cast<void*>(scope_site->ptr())); |
| } |
| } else { |
| DCHECK(!current().is_null()); |
| scope_site = isolate()->factory()->NewAllocationSite(false); |
| if (v8_flags.trace_creation_allocation_sites) { |
| PrintF( |
| "*** Creating nested %s AllocationSite (top, current, new) (%p, " |
| "%p, " |
| "%p)\n", |
| "Slim", reinterpret_cast<void*>(top()->ptr()), |
| reinterpret_cast<void*>(current()->ptr()), |
| reinterpret_cast<void*>(scope_site->ptr())); |
| } |
| 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, kReleaseStore); |
| if (v8_flags.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", |
| reinterpret_cast<void*>(scope_site->ptr()), |
| reinterpret_cast<void*>(object->ptr())); |
| } else { |
| PrintF("*** Setting AllocationSite (%p, %p) transition_info %p\n", |
| reinterpret_cast<void*>(top()->ptr()), |
| reinterpret_cast<void*>(scope_site->ptr()), |
| reinterpret_cast<void*>(object->ptr())); |
| } |
| } |
| } |
| static const bool kCopying = false; |
| }; |
| |
| MaybeHandle<JSObject> DeepWalk(Handle<JSObject> object, |
| DeprecationUpdateContext* site_context) { |
| JSObjectWalkVisitor<DeprecationUpdateContext> v(site_context); |
| 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); |
| 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) { |
| JSObjectWalkVisitor<AllocationSiteUsageContext> v(site_context); |
| MaybeHandle<JSObject> copy = v.StructureWalk(object); |
| Handle<JSObject> for_assert; |
| DCHECK(!copy.ToHandle(&for_assert) || !for_assert.is_identical_to(object)); |
| return copy; |
| } |
| |
| Handle<JSObject> CreateObjectLiteral( |
| Isolate* isolate, |
| Handle<ObjectBoilerplateDescription> object_boilerplate_description, |
| int flags, AllocationType allocation); |
| |
| Handle<JSObject> CreateArrayLiteral( |
| Isolate* isolate, |
| Handle<ArrayBoilerplateDescription> array_boilerplate_description, |
| AllocationType allocation); |
| |
| struct ObjectLiteralHelper { |
| static inline Handle<JSObject> Create(Isolate* isolate, |
| Handle<HeapObject> description, |
| int flags, AllocationType allocation) { |
| Handle<ObjectBoilerplateDescription> object_boilerplate_description = |
| Handle<ObjectBoilerplateDescription>::cast(description); |
| return CreateObjectLiteral(isolate, object_boilerplate_description, flags, |
| allocation); |
| } |
| }; |
| |
| struct ArrayLiteralHelper { |
| static inline Handle<JSObject> Create(Isolate* isolate, |
| Handle<HeapObject> description, |
| int flags_not_used, |
| AllocationType allocation) { |
| Handle<ArrayBoilerplateDescription> array_boilerplate_description = |
| Handle<ArrayBoilerplateDescription>::cast(description); |
| return CreateArrayLiteral(isolate, array_boilerplate_description, |
| allocation); |
| } |
| }; |
| |
| Handle<JSObject> CreateObjectLiteral( |
| Isolate* isolate, |
| Handle<ObjectBoilerplateDescription> object_boilerplate_description, |
| int flags, AllocationType allocation) { |
| Handle<NativeContext> native_context = isolate->native_context(); |
| 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 = |
| object_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 = |
| isolate->factory()->NewFastOrSlowJSObjectFromMap( |
| map, number_of_properties, allocation); |
| |
| // 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 = object_boilerplate_description->boilerplate_properties_count(); |
| // TODO(verwaest): Support tracking representations in the boilerplate. |
| for (int index = 0; index < length; index++) { |
| Handle<Object> key(object_boilerplate_description->name(index), isolate); |
| Handle<Object> value(object_boilerplate_description->value(index), isolate); |
| |
| if (IsHeapObject(*value)) { |
| if (IsArrayBoilerplateDescription(HeapObject::cast(*value), isolate)) { |
| Handle<ArrayBoilerplateDescription> array_boilerplate = |
| Handle<ArrayBoilerplateDescription>::cast(value); |
| value = CreateArrayLiteral(isolate, array_boilerplate, allocation); |
| |
| } else if (IsObjectBoilerplateDescription(HeapObject::cast(*value), |
| isolate)) { |
| Handle<ObjectBoilerplateDescription> object_boilerplate = |
| Handle<ObjectBoilerplateDescription>::cast(value); |
| value = CreateObjectLiteral(isolate, object_boilerplate, |
| object_boilerplate->flags(), allocation); |
| } |
| } |
| |
| uint32_t element_index = 0; |
| if (Object::ToArrayIndex(*key, &element_index)) { |
| // Array index (uint32). |
| if (IsUninitialized(*value, isolate)) { |
| value = handle(Smi::zero(), 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; |
| } |
| |
| Handle<JSObject> CreateArrayLiteral( |
| Isolate* isolate, |
| Handle<ArrayBoilerplateDescription> array_boilerplate_description, |
| AllocationType allocation) { |
| ElementsKind constant_elements_kind = |
| array_boilerplate_description->elements_kind(); |
| |
| Handle<FixedArrayBase> constant_elements_values( |
| array_boilerplate_description->constant_elements(isolate), isolate); |
| |
| // Create the JSArray. |
| 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) == |
| ReadOnlyRoots(isolate).fixed_cow_array_map()); |
| if (is_cow) { |
| copied_elements_values = constant_elements_values; |
| if (DEBUG_BOOL) { |
| Handle<FixedArray> fixed_array_values = |
| Handle<FixedArray>::cast(copied_elements_values); |
| for (int i = 0; i < fixed_array_values->length(); i++) { |
| DCHECK(!IsFixedArray(fixed_array_values->get(i))); |
| } |
| } |
| } 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 (int i = 0; i < fixed_array_values->length(); i++) { |
| Tagged<Object> value = fixed_array_values_copy->get(i); |
| Tagged<HeapObject> value_heap_object; |
| if (value.GetHeapObject(isolate, &value_heap_object)) { |
| if (IsArrayBoilerplateDescription(value_heap_object, isolate)) { |
| HandleScope sub_scope(isolate); |
| Handle<ArrayBoilerplateDescription> boilerplate( |
| ArrayBoilerplateDescription::cast(value_heap_object), isolate); |
| Handle<JSObject> result = |
| CreateArrayLiteral(isolate, boilerplate, allocation); |
| fixed_array_values_copy->set(i, *result); |
| |
| } else if (IsObjectBoilerplateDescription(value_heap_object, |
| isolate)) { |
| HandleScope sub_scope(isolate); |
| Handle<ObjectBoilerplateDescription> boilerplate( |
| ObjectBoilerplateDescription::cast(value_heap_object), isolate); |
| Handle<JSObject> result = CreateObjectLiteral( |
| isolate, boilerplate, boilerplate->flags(), allocation); |
| fixed_array_values_copy->set(i, *result); |
| } |
| } |
| } |
| } |
| } |
| return isolate->factory()->NewJSArrayWithElements( |
| copied_elements_values, constant_elements_kind, |
| copied_elements_values->length(), allocation); |
| } |
| |
| template <typename LiteralHelper> |
| MaybeHandle<JSObject> CreateLiteralWithoutAllocationSite( |
| Isolate* isolate, Handle<HeapObject> description, int flags) { |
| Handle<JSObject> literal = LiteralHelper::Create(isolate, description, flags, |
| AllocationType::kYoung); |
| DeprecationUpdateContext update_context(isolate); |
| RETURN_ON_EXCEPTION(isolate, DeepWalk(literal, &update_context), JSObject); |
| return literal; |
| } |
| |
| template <typename LiteralHelper> |
| MaybeHandle<JSObject> CreateLiteral(Isolate* isolate, |
| Handle<HeapObject> maybe_vector, |
| int literals_index, |
| Handle<HeapObject> description, int flags) { |
| if (!IsFeedbackVector(*maybe_vector)) { |
| DCHECK(IsUndefined(*maybe_vector)); |
| return CreateLiteralWithoutAllocationSite<LiteralHelper>( |
| isolate, description, flags); |
| } |
| Handle<FeedbackVector> vector = Handle<FeedbackVector>::cast(maybe_vector); |
| FeedbackSlot literals_slot(FeedbackVector::ToSlot(literals_index)); |
| CHECK(literals_slot.ToInt() < vector->length()); |
| Handle<Object> literal_site(Tagged<Object>::cast(vector->Get(literals_slot)), |
| isolate); |
| Handle<AllocationSite> site; |
| Handle<JSObject> boilerplate; |
| |
| if (HasBoilerplate(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; |
| if (!needs_initial_allocation_site && |
| IsUninitializedLiteralSite(*literal_site)) { |
| PreInitializeLiteralSite(vector, literals_slot); |
| return CreateLiteralWithoutAllocationSite<LiteralHelper>( |
| isolate, description, flags); |
| } else { |
| boilerplate = LiteralHelper::Create(isolate, description, flags, |
| AllocationType::kOld); |
| } |
| // 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->SynchronizedSet(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); |
| usage_context.ExitScope(site, boilerplate); |
| return copy; |
| } |
| |
| } // namespace |
| |
| RUNTIME_FUNCTION(Runtime_CreateObjectLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| Handle<HeapObject> maybe_vector = args.at<HeapObject>(0); |
| int literals_index = args.tagged_index_value_at(1); |
| Handle<ObjectBoilerplateDescription> description = |
| args.at<ObjectBoilerplateDescription>(2); |
| int flags = args.smi_value_at(3); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, CreateLiteral<ObjectLiteralHelper>( |
| isolate, maybe_vector, literals_index, description, flags)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_CreateArrayLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| Handle<HeapObject> maybe_vector = args.at<HeapObject>(0); |
| int literals_index = args.tagged_index_value_at(1); |
| Handle<ArrayBoilerplateDescription> elements = |
| args.at<ArrayBoilerplateDescription>(2); |
| int flags = args.smi_value_at(3); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, CreateLiteral<ArrayLiteralHelper>( |
| isolate, maybe_vector, literals_index, elements, flags)); |
| } |
| |
| RUNTIME_FUNCTION(Runtime_CreateRegExpLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| Handle<HeapObject> maybe_vector = args.at<HeapObject>(0); |
| int index = args.tagged_index_value_at(1); |
| Handle<String> pattern = args.at<String>(2); |
| int flags = args.smi_value_at(3); |
| |
| if (IsUndefined(*maybe_vector)) { |
| // We don't have a vector; don't create a boilerplate, simply construct a |
| // plain JSRegExp instance and return it. |
| RETURN_RESULT_OR_FAILURE( |
| isolate, JSRegExp::New(isolate, pattern, JSRegExp::Flags(flags))); |
| } |
| |
| Handle<FeedbackVector> vector = Handle<FeedbackVector>::cast(maybe_vector); |
| FeedbackSlot literal_slot(FeedbackVector::ToSlot(index)); |
| Handle<Object> literal_site(Tagged<Object>::cast(vector->Get(literal_slot)), |
| isolate); |
| |
| // This function must not be called when a boilerplate already exists (if it |
| // exists, callers should instead copy the boilerplate into a new JSRegExp |
| // instance). |
| CHECK(!HasBoilerplate(literal_site)); |
| |
| Handle<JSRegExp> regexp_instance; |
| ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| isolate, regexp_instance, |
| JSRegExp::New(isolate, pattern, JSRegExp::Flags(flags))); |
| |
| // JSRegExp literal sites are initialized in a two-step process: |
| // Uninitialized-Preinitialized, and Preinitialized-Initialized. |
| if (IsUninitializedLiteralSite(*literal_site)) { |
| PreInitializeLiteralSite(vector, literal_slot); |
| return *regexp_instance; |
| } |
| |
| Handle<FixedArray> data(FixedArray::cast(regexp_instance->data()), isolate); |
| Handle<String> source(String::cast(regexp_instance->source()), isolate); |
| Handle<RegExpBoilerplateDescription> boilerplate = |
| isolate->factory()->NewRegExpBoilerplateDescription( |
| data, source, |
| Smi::FromInt(static_cast<int>(regexp_instance->flags()))); |
| |
| vector->SynchronizedSet(literal_slot, *boilerplate); |
| DCHECK(HasBoilerplate( |
| handle(Tagged<Object>::cast(vector->Get(literal_slot)), isolate))); |
| |
| return *regexp_instance; |
| } |
| |
| } // namespace internal |
| } // namespace v8 |
