| // 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 { |
| |
| static Handle<Map> ComputeObjectLiteralMap( |
| Handle<Context> context, |
| Handle<BoilerplateDescription> boilerplate_description, |
| bool* is_result_from_cache) { |
| int number_of_properties = boilerplate_description->backing_store_size(); |
| Isolate* isolate = context->GetIsolate(); |
| return isolate->factory()->ObjectLiteralMapFromCache( |
| context, number_of_properties, is_result_from_cache); |
| } |
| |
| MUST_USE_RESULT static MaybeHandle<Object> CreateLiteralBoilerplate( |
| Isolate* isolate, Handle<FeedbackVector> vector, |
| Handle<BoilerplateDescription> boilerplate_description); |
| |
| MUST_USE_RESULT static MaybeHandle<Object> CreateObjectLiteralBoilerplate( |
| Isolate* isolate, Handle<FeedbackVector> vector, |
| Handle<BoilerplateDescription> boilerplate_description, |
| bool should_have_fast_elements) { |
| Handle<Context> context = isolate->native_context(); |
| |
| // 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). |
| bool is_result_from_cache = false; |
| Handle<Map> map = ComputeObjectLiteralMap(context, boilerplate_description, |
| &is_result_from_cache); |
| |
| PretenureFlag pretenure_flag = |
| isolate->heap()->InNewSpace(*vector) ? NOT_TENURED : TENURED; |
| |
| Handle<JSObject> boilerplate = |
| isolate->factory()->NewJSObjectFromMap(map, pretenure_flag); |
| |
| // Normalize the elements of the boilerplate to save space if needed. |
| if (!should_have_fast_elements) JSObject::NormalizeElements(boilerplate); |
| |
| // Add the constant properties to the boilerplate. |
| int length = boilerplate_description->size(); |
| bool should_transform = |
| !is_result_from_cache && boilerplate->HasFastProperties(); |
| bool should_normalize = should_transform; |
| if (should_normalize) { |
| // TODO(verwaest): We might not want to ever normalize here. |
| JSObject::NormalizeProperties(boilerplate, KEEP_INOBJECT_PROPERTIES, length, |
| "Boilerplate"); |
| } |
| // 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->IsBoilerplateDescription()) { |
| // The value contains the boilerplate properties of a |
| // simple object or array literal. |
| Handle<BoilerplateDescription> boilerplate = |
| Handle<BoilerplateDescription>::cast(value); |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, value, |
| CreateLiteralBoilerplate(isolate, vector, boilerplate), Object); |
| } |
| MaybeHandle<Object> maybe_result; |
| uint32_t element_index = 0; |
| if (key->ToArrayIndex(&element_index)) { |
| // Array index (uint32). |
| if (value->IsUninitialized(isolate)) { |
| value = handle(Smi::kZero, isolate); |
| } |
| maybe_result = JSObject::SetOwnElementIgnoreAttributes( |
| boilerplate, element_index, value, NONE); |
| } else { |
| Handle<String> name = Handle<String>::cast(key); |
| DCHECK(!name->AsArrayIndex(&element_index)); |
| maybe_result = JSObject::SetOwnPropertyIgnoreAttributes(boilerplate, name, |
| value, NONE); |
| } |
| RETURN_ON_EXCEPTION(isolate, maybe_result, Object); |
| } |
| |
| // Transform to fast properties if necessary. For object literals with |
| // containing function literals we defer this operation until after all |
| // computed properties have been assigned so that we can generate |
| // constant function properties. |
| if (should_transform) { |
| JSObject::MigrateSlowToFast(boilerplate, |
| boilerplate->map()->unused_property_fields(), |
| "FastLiteral"); |
| } |
| return boilerplate; |
| } |
| |
| static MaybeHandle<Object> CreateArrayLiteralBoilerplate( |
| Isolate* isolate, Handle<FeedbackVector> vector, |
| Handle<ConstantElementsPair> elements) { |
| // Create the JSArray. |
| Handle<JSFunction> constructor = isolate->array_function(); |
| |
| PretenureFlag pretenure_flag = |
| isolate->heap()->InNewSpace(*vector) ? NOT_TENURED : TENURED; |
| |
| Handle<JSArray> object = Handle<JSArray>::cast( |
| isolate->factory()->NewJSObject(constructor, pretenure_flag)); |
| |
| ElementsKind constant_elements_kind = |
| static_cast<ElementsKind>(elements->elements_kind()); |
| Handle<FixedArrayBase> constant_elements_values(elements->constant_values()); |
| |
| { |
| DisallowHeapAllocation no_gc; |
| DCHECK(IsFastElementsKind(constant_elements_kind)); |
| Context* native_context = isolate->context()->native_context(); |
| Object* map = |
| native_context->get(Context::ArrayMapIndex(constant_elements_kind)); |
| object->set_map(Map::cast(map)); |
| } |
| |
| Handle<FixedArrayBase> copied_elements_values; |
| if (IsFastDoubleElementsKind(constant_elements_kind)) { |
| copied_elements_values = isolate->factory()->CopyFixedDoubleArray( |
| Handle<FixedDoubleArray>::cast(constant_elements_values)); |
| } else { |
| DCHECK(IsFastSmiOrObjectElementsKind(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)->IsBoilerplateDescription()) { |
| // The value contains the boilerplate properties of a |
| // simple object or array literal. |
| Handle<BoilerplateDescription> boilerplate( |
| BoilerplateDescription::cast(fixed_array_values->get(i))); |
| Handle<Object> result; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, result, |
| CreateLiteralBoilerplate(isolate, vector, boilerplate), |
| Object); |
| fixed_array_values_copy->set(i, *result); |
| } |
| }); |
| } |
| } |
| object->set_elements(*copied_elements_values); |
| object->set_length(Smi::FromInt(copied_elements_values->length())); |
| |
| JSObject::ValidateElements(object); |
| return object; |
| } |
| |
| MUST_USE_RESULT static MaybeHandle<Object> CreateLiteralBoilerplate( |
| Isolate* isolate, Handle<FeedbackVector> vector, |
| Handle<BoilerplateDescription> array) { |
| Handle<HeapObject> elements = CompileTimeValue::GetElements(array); |
| switch (CompileTimeValue::GetLiteralType(array)) { |
| case CompileTimeValue::OBJECT_LITERAL_FAST_ELEMENTS: { |
| Handle<BoilerplateDescription> props = |
| Handle<BoilerplateDescription>::cast(elements); |
| return CreateObjectLiteralBoilerplate(isolate, vector, props, true); |
| } |
| case CompileTimeValue::OBJECT_LITERAL_SLOW_ELEMENTS: { |
| Handle<BoilerplateDescription> props = |
| Handle<BoilerplateDescription>::cast(elements); |
| return CreateObjectLiteralBoilerplate(isolate, vector, props, false); |
| } |
| case CompileTimeValue::ARRAY_LITERAL: { |
| Handle<ConstantElementsPair> elems = |
| Handle<ConstantElementsPair>::cast(elements); |
| return CreateArrayLiteralBoilerplate(isolate, vector, elems); |
| } |
| default: |
| UNREACHABLE(); |
| return MaybeHandle<Object>(); |
| } |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_CreateRegExpLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, closure, 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> boilerplate(closure->feedback_vector()->Get(literal_slot), |
| isolate); |
| if (boilerplate->IsUndefined(isolate)) { |
| ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| isolate, boilerplate, JSRegExp::New(pattern, JSRegExp::Flags(flags))); |
| closure->feedback_vector()->Set(literal_slot, *boilerplate); |
| } |
| return *JSRegExp::Copy(Handle<JSRegExp>::cast(boilerplate)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_CreateObjectLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, closure, 0); |
| CONVERT_SMI_ARG_CHECKED(literals_index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(BoilerplateDescription, boilerplate_description, |
| 2); |
| CONVERT_SMI_ARG_CHECKED(flags, 3); |
| Handle<FeedbackVector> vector(closure->feedback_vector(), isolate); |
| bool should_have_fast_elements = (flags & ObjectLiteral::kFastElements) != 0; |
| bool enable_mementos = (flags & ObjectLiteral::kDisableMementos) == 0; |
| |
| FeedbackSlot literals_slot(FeedbackVector::ToSlot(literals_index)); |
| CHECK(literals_slot.ToInt() < vector->slot_count()); |
| |
| // Check if boilerplate exists. If not, create it first. |
| Handle<Object> literal_site(vector->Get(literals_slot), isolate); |
| Handle<AllocationSite> site; |
| Handle<JSObject> boilerplate; |
| if (literal_site->IsUndefined(isolate)) { |
| Handle<Object> raw_boilerplate; |
| ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| isolate, raw_boilerplate, |
| CreateObjectLiteralBoilerplate(isolate, vector, boilerplate_description, |
| should_have_fast_elements)); |
| boilerplate = Handle<JSObject>::cast(raw_boilerplate); |
| |
| AllocationSiteCreationContext creation_context(isolate); |
| site = creation_context.EnterNewScope(); |
| RETURN_FAILURE_ON_EXCEPTION( |
| isolate, JSObject::DeepWalk(boilerplate, &creation_context)); |
| creation_context.ExitScope(site, boilerplate); |
| |
| // Update the functions literal and return the boilerplate. |
| vector->Set(literals_slot, *site); |
| } else { |
| site = Handle<AllocationSite>::cast(literal_site); |
| boilerplate = |
| Handle<JSObject>(JSObject::cast(site->transition_info()), isolate); |
| } |
| |
| AllocationSiteUsageContext usage_context(isolate, site, enable_mementos); |
| usage_context.EnterNewScope(); |
| MaybeHandle<Object> maybe_copy = |
| JSObject::DeepCopy(boilerplate, &usage_context); |
| usage_context.ExitScope(site, boilerplate); |
| RETURN_RESULT_OR_FAILURE(isolate, maybe_copy); |
| } |
| |
| MUST_USE_RESULT static MaybeHandle<AllocationSite> GetLiteralAllocationSite( |
| Isolate* isolate, Handle<FeedbackVector> vector, FeedbackSlot literals_slot, |
| Handle<ConstantElementsPair> elements) { |
| // Check if boilerplate exists. If not, create it first. |
| Handle<Object> literal_site(vector->Get(literals_slot), isolate); |
| Handle<AllocationSite> site; |
| if (literal_site->IsUndefined(isolate)) { |
| Handle<Object> boilerplate; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, boilerplate, |
| CreateArrayLiteralBoilerplate(isolate, vector, elements), |
| AllocationSite); |
| |
| AllocationSiteCreationContext creation_context(isolate); |
| site = creation_context.EnterNewScope(); |
| if (JSObject::DeepWalk(Handle<JSObject>::cast(boilerplate), |
| &creation_context).is_null()) { |
| return Handle<AllocationSite>::null(); |
| } |
| creation_context.ExitScope(site, Handle<JSObject>::cast(boilerplate)); |
| |
| vector->Set(literals_slot, *site); |
| } else { |
| site = Handle<AllocationSite>::cast(literal_site); |
| } |
| |
| return site; |
| } |
| |
| static MaybeHandle<JSObject> CreateArrayLiteralImpl( |
| Isolate* isolate, Handle<FeedbackVector> vector, FeedbackSlot literals_slot, |
| Handle<ConstantElementsPair> elements, int flags) { |
| CHECK(literals_slot.ToInt() < vector->slot_count()); |
| Handle<AllocationSite> site; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, site, |
| GetLiteralAllocationSite(isolate, vector, literals_slot, elements), |
| JSObject); |
| |
| bool enable_mementos = (flags & ArrayLiteral::kDisableMementos) == 0; |
| Handle<JSObject> boilerplate(JSObject::cast(site->transition_info())); |
| AllocationSiteUsageContext usage_context(isolate, site, enable_mementos); |
| usage_context.EnterNewScope(); |
| JSObject::DeepCopyHints hints = (flags & ArrayLiteral::kShallowElements) == 0 |
| ? JSObject::kNoHints |
| : JSObject::kObjectIsShallow; |
| MaybeHandle<JSObject> copy = |
| JSObject::DeepCopy(boilerplate, &usage_context, hints); |
| usage_context.ExitScope(site, boilerplate); |
| return copy; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_CreateArrayLiteral) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(4, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, closure, 0); |
| CONVERT_SMI_ARG_CHECKED(literals_index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(ConstantElementsPair, elements, 2); |
| CONVERT_SMI_ARG_CHECKED(flags, 3); |
| |
| FeedbackSlot literals_slot(FeedbackVector::ToSlot(literals_index)); |
| Handle<FeedbackVector> vector(closure->feedback_vector(), isolate); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, |
| CreateArrayLiteralImpl(isolate, vector, literals_slot, elements, flags)); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_CreateArrayLiteralStubBailout) { |
| HandleScope scope(isolate); |
| DCHECK_EQ(3, args.length()); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, closure, 0); |
| CONVERT_SMI_ARG_CHECKED(literals_index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(ConstantElementsPair, elements, 2); |
| |
| Handle<FeedbackVector> vector(closure->feedback_vector(), isolate); |
| FeedbackSlot literals_slot(FeedbackVector::ToSlot(literals_index)); |
| RETURN_RESULT_OR_FAILURE( |
| isolate, CreateArrayLiteralImpl(isolate, vector, literals_slot, elements, |
| ArrayLiteral::kShallowElements)); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |