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// Copyright 2017 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/init/setup-isolate.h"
#include "src/builtins/accessors.h"
#include "src/codegen/compilation-cache.h"
#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h"
#include "src/ic/handler-configuration.h"
#include "src/init/heap-symbols.h"
#include "src/interpreter/interpreter.h"
#include "src/objects/arguments.h"
#include "src/objects/cell-inl.h"
#include "src/objects/contexts.h"
#include "src/objects/data-handler.h"
#include "src/objects/debug-objects.h"
#include "src/objects/descriptor-array.h"
#include "src/objects/dictionary.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/instance-type-inl.h"
#include "src/objects/js-generator.h"
#include "src/objects/js-weak-refs.h"
#include "src/objects/layout-descriptor.h"
#include "src/objects/literal-objects-inl.h"
#include "src/objects/lookup-cache.h"
#include "src/objects/map.h"
#include "src/objects/microtask.h"
#include "src/objects/objects-inl.h"
#include "src/objects/oddball-inl.h"
#include "src/objects/ordered-hash-table.h"
#include "src/objects/promise.h"
#include "src/objects/script.h"
#include "src/objects/shared-function-info.h"
#include "src/objects/smi.h"
#include "src/objects/source-text-module.h"
#include "src/objects/stack-frame-info.h"
#include "src/objects/string.h"
#include "src/objects/synthetic-module.h"
#include "src/objects/template-objects-inl.h"
#include "src/regexp/regexp.h"
#include "src/wasm/wasm-objects.h"
#include "torque-generated/class-definitions-tq.h"
#include "torque-generated/internal-class-definitions-tq-inl.h"
namespace v8 {
namespace internal {
bool SetupIsolateDelegate::SetupHeapInternal(Heap* heap) {
return heap->CreateHeapObjects();
}
bool Heap::CreateHeapObjects() {
// Create initial maps.
if (!CreateInitialMaps()) return false;
CreateApiObjects();
// Create initial objects
CreateInitialObjects();
CreateInternalAccessorInfoObjects();
CHECK_EQ(0u, gc_count_);
set_native_contexts_list(ReadOnlyRoots(this).undefined_value());
set_allocation_sites_list(ReadOnlyRoots(this).undefined_value());
return true;
}
const Heap::StringTypeTable Heap::string_type_table[] = {
#define STRING_TYPE_ELEMENT(type, size, name, CamelName) \
{type, size, RootIndex::k##CamelName##Map},
STRING_TYPE_LIST(STRING_TYPE_ELEMENT)
#undef STRING_TYPE_ELEMENT
};
const Heap::ConstantStringTable Heap::constant_string_table[] = {
{"", RootIndex::kempty_string},
#define CONSTANT_STRING_ELEMENT(_, name, contents) \
{contents, RootIndex::k##name},
INTERNALIZED_STRING_LIST_GENERATOR(CONSTANT_STRING_ELEMENT, /* not used */)
#undef CONSTANT_STRING_ELEMENT
};
const Heap::StructTable Heap::struct_table[] = {
#define STRUCT_TABLE_ELEMENT(TYPE, Name, name) \
{TYPE, Name::kSize, RootIndex::k##Name##Map},
STRUCT_LIST(STRUCT_TABLE_ELEMENT)
#undef STRUCT_TABLE_ELEMENT
#define ALLOCATION_SITE_ELEMENT(_, TYPE, Name, Size, name) \
{TYPE, Name::kSize##Size, RootIndex::k##Name##Size##Map},
ALLOCATION_SITE_LIST(ALLOCATION_SITE_ELEMENT, /* not used */)
#undef ALLOCATION_SITE_ELEMENT
#define DATA_HANDLER_ELEMENT(_, TYPE, Name, Size, name) \
{TYPE, Name::kSizeWithData##Size, RootIndex::k##Name##Size##Map},
DATA_HANDLER_LIST(DATA_HANDLER_ELEMENT, /* not used */)
#undef DATA_HANDLER_ELEMENT
};
AllocationResult Heap::AllocateMap(InstanceType instance_type,
int instance_size,
ElementsKind elements_kind,
int inobject_properties) {
STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
bool is_js_object = InstanceTypeChecker::IsJSObject(instance_type);
DCHECK_IMPLIES(is_js_object &&
!Map::CanHaveFastTransitionableElementsKind(instance_type),
IsDictionaryElementsKind(elements_kind) ||
IsTerminalElementsKind(elements_kind));
HeapObject result;
// JSObjects have maps with a mutable prototype_validity_cell, so they cannot
// go in RO_SPACE.
AllocationResult allocation =
AllocateRaw(Map::kSize, is_js_object ? AllocationType::kMap
: AllocationType::kReadOnly);
if (!allocation.To(&result)) return allocation;
result.set_map_after_allocation(ReadOnlyRoots(this).meta_map(),
SKIP_WRITE_BARRIER);
Map map = isolate()->factory()->InitializeMap(
Map::cast(result), instance_type, instance_size, elements_kind,
inobject_properties);
return map;
}
AllocationResult Heap::AllocatePartialMap(InstanceType instance_type,
int instance_size) {
Object result;
AllocationResult allocation =
AllocateRaw(Map::kSize, AllocationType::kReadOnly);
if (!allocation.To(&result)) return allocation;
// Map::cast cannot be used due to uninitialized map field.
Map map = Map::unchecked_cast(result);
map.set_map_after_allocation(
Map::unchecked_cast(isolate()->root(RootIndex::kMetaMap)),
SKIP_WRITE_BARRIER);
map.set_instance_type(instance_type);
map.set_instance_size(instance_size);
// Initialize to only containing tagged fields.
if (FLAG_unbox_double_fields) {
map.set_layout_descriptor(LayoutDescriptor::FastPointerLayout());
}
// GetVisitorId requires a properly initialized LayoutDescriptor.
map.set_visitor_id(Map::GetVisitorId(map));
map.set_inobject_properties_start_or_constructor_function_index(0);
DCHECK(!map.IsJSObjectMap());
map.set_prototype_validity_cell(Smi::FromInt(Map::kPrototypeChainValid));
map.SetInObjectUnusedPropertyFields(0);
map.set_bit_field(0);
map.set_bit_field2(0);
int bit_field3 = Map::EnumLengthBits::encode(kInvalidEnumCacheSentinel) |
Map::OwnsDescriptorsBit::encode(true) |
Map::ConstructionCounterBits::encode(Map::kNoSlackTracking);
map.set_bit_field3(bit_field3);
DCHECK(!map.is_in_retained_map_list());
map.clear_padding();
map.set_elements_kind(TERMINAL_FAST_ELEMENTS_KIND);
return map;
}
void Heap::FinalizePartialMap(Map map) {
ReadOnlyRoots roots(this);
map.set_dependent_code(DependentCode::cast(roots.empty_weak_fixed_array()));
map.set_raw_transitions(MaybeObject::FromSmi(Smi::zero()));
map.SetInstanceDescriptors(isolate(), roots.empty_descriptor_array(), 0);
if (FLAG_unbox_double_fields) {
map.set_layout_descriptor(LayoutDescriptor::FastPointerLayout());
}
map.set_prototype(roots.null_value());
map.set_constructor_or_backpointer(roots.null_value());
}
AllocationResult Heap::Allocate(Map map, AllocationType allocation_type) {
DCHECK(map.instance_type() != MAP_TYPE);
int size = map.instance_size();
HeapObject result;
AllocationResult allocation = AllocateRaw(size, allocation_type);
if (!allocation.To(&result)) return allocation;
// New space objects are allocated white.
WriteBarrierMode write_barrier_mode =
allocation_type == AllocationType::kYoung ? SKIP_WRITE_BARRIER
: UPDATE_WRITE_BARRIER;
result.set_map_after_allocation(map, write_barrier_mode);
return result;
}
bool Heap::CreateInitialMaps() {
HeapObject obj;
{
AllocationResult allocation = AllocatePartialMap(MAP_TYPE, Map::kSize);
if (!allocation.To(&obj)) return false;
}
// Map::cast cannot be used due to uninitialized map field.
Map new_meta_map = Map::unchecked_cast(obj);
set_meta_map(new_meta_map);
new_meta_map.set_map_after_allocation(new_meta_map);
ReadOnlyRoots roots(this);
{ // Partial map allocation
#define ALLOCATE_PARTIAL_MAP(instance_type, size, field_name) \
{ \
Map map; \
if (!AllocatePartialMap((instance_type), (size)).To(&map)) return false; \
set_##field_name##_map(map); \
}
ALLOCATE_PARTIAL_MAP(FIXED_ARRAY_TYPE, kVariableSizeSentinel, fixed_array);
ALLOCATE_PARTIAL_MAP(WEAK_FIXED_ARRAY_TYPE, kVariableSizeSentinel,
weak_fixed_array);
ALLOCATE_PARTIAL_MAP(WEAK_ARRAY_LIST_TYPE, kVariableSizeSentinel,
weak_array_list);
ALLOCATE_PARTIAL_MAP(FIXED_ARRAY_TYPE, kVariableSizeSentinel,
fixed_cow_array)
DCHECK_NE(roots.fixed_array_map(), roots.fixed_cow_array_map());
ALLOCATE_PARTIAL_MAP(DESCRIPTOR_ARRAY_TYPE, kVariableSizeSentinel,
descriptor_array)
ALLOCATE_PARTIAL_MAP(ODDBALL_TYPE, Oddball::kSize, undefined);
ALLOCATE_PARTIAL_MAP(ODDBALL_TYPE, Oddball::kSize, null);
ALLOCATE_PARTIAL_MAP(ODDBALL_TYPE, Oddball::kSize, the_hole);
#undef ALLOCATE_PARTIAL_MAP
}
// Allocate the empty array.
{
AllocationResult alloc =
AllocateRaw(FixedArray::SizeFor(0), AllocationType::kReadOnly);
if (!alloc.To(&obj)) return false;
obj.set_map_after_allocation(roots.fixed_array_map(), SKIP_WRITE_BARRIER);
FixedArray::cast(obj).set_length(0);
}
set_empty_fixed_array(FixedArray::cast(obj));
{
AllocationResult alloc =
AllocateRaw(WeakFixedArray::SizeFor(0), AllocationType::kReadOnly);
if (!alloc.To(&obj)) return false;
obj.set_map_after_allocation(roots.weak_fixed_array_map(),
SKIP_WRITE_BARRIER);
WeakFixedArray::cast(obj).set_length(0);
}
set_empty_weak_fixed_array(WeakFixedArray::cast(obj));
{
AllocationResult allocation = AllocateRaw(WeakArrayList::SizeForCapacity(0),
AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
obj.set_map_after_allocation(roots.weak_array_list_map(),
SKIP_WRITE_BARRIER);
WeakArrayList::cast(obj).set_capacity(0);
WeakArrayList::cast(obj).set_length(0);
}
set_empty_weak_array_list(WeakArrayList::cast(obj));
{
AllocationResult allocation =
Allocate(roots.null_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_null_value(Oddball::cast(obj));
Oddball::cast(obj).set_kind(Oddball::kNull);
{
AllocationResult allocation =
Allocate(roots.undefined_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_undefined_value(Oddball::cast(obj));
Oddball::cast(obj).set_kind(Oddball::kUndefined);
DCHECK(!InYoungGeneration(roots.undefined_value()));
{
AllocationResult allocation =
Allocate(roots.the_hole_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_the_hole_value(Oddball::cast(obj));
Oddball::cast(obj).set_kind(Oddball::kTheHole);
// Set preliminary exception sentinel value before actually initializing it.
set_exception(roots.null_value());
// Setup the struct maps first (needed for the EnumCache).
for (unsigned i = 0; i < arraysize(struct_table); i++) {
const StructTable& entry = struct_table[i];
Map map;
if (!AllocatePartialMap(entry.type, entry.size).To(&map)) return false;
roots_table()[entry.index] = map.ptr();
}
// Allocate the empty enum cache.
{
AllocationResult allocation =
Allocate(roots.enum_cache_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_empty_enum_cache(EnumCache::cast(obj));
EnumCache::cast(obj).set_keys(roots.empty_fixed_array());
EnumCache::cast(obj).set_indices(roots.empty_fixed_array());
// Allocate the empty descriptor array.
{
int size = DescriptorArray::SizeFor(0);
if (!AllocateRaw(size, AllocationType::kReadOnly).To(&obj)) return false;
obj.set_map_after_allocation(roots.descriptor_array_map(),
SKIP_WRITE_BARRIER);
DescriptorArray array = DescriptorArray::cast(obj);
array.Initialize(roots.empty_enum_cache(), roots.undefined_value(), 0, 0);
}
set_empty_descriptor_array(DescriptorArray::cast(obj));
// Fix the instance_descriptors for the existing maps.
FinalizePartialMap(roots.meta_map());
FinalizePartialMap(roots.fixed_array_map());
FinalizePartialMap(roots.weak_fixed_array_map());
FinalizePartialMap(roots.weak_array_list_map());
FinalizePartialMap(roots.fixed_cow_array_map());
FinalizePartialMap(roots.descriptor_array_map());
FinalizePartialMap(roots.undefined_map());
roots.undefined_map().set_is_undetectable(true);
FinalizePartialMap(roots.null_map());
roots.null_map().set_is_undetectable(true);
FinalizePartialMap(roots.the_hole_map());
for (unsigned i = 0; i < arraysize(struct_table); ++i) {
const StructTable& entry = struct_table[i];
FinalizePartialMap(Map::cast(Object(roots_table()[entry.index])));
}
{ // Map allocation
#define ALLOCATE_MAP(instance_type, size, field_name) \
{ \
Map map; \
if (!AllocateMap((instance_type), size).To(&map)) return false; \
set_##field_name##_map(map); \
}
#define ALLOCATE_VARSIZE_MAP(instance_type, field_name) \
ALLOCATE_MAP(instance_type, kVariableSizeSentinel, field_name)
#define ALLOCATE_PRIMITIVE_MAP(instance_type, size, field_name, \
constructor_function_index) \
{ \
ALLOCATE_MAP((instance_type), (size), field_name); \
roots.field_name##_map().SetConstructorFunctionIndex( \
(constructor_function_index)); \
}
ALLOCATE_VARSIZE_MAP(SCOPE_INFO_TYPE, scope_info)
ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, module_info)
ALLOCATE_VARSIZE_MAP(CLOSURE_FEEDBACK_CELL_ARRAY_TYPE,
closure_feedback_cell_array)
ALLOCATE_VARSIZE_MAP(FEEDBACK_VECTOR_TYPE, feedback_vector)
ALLOCATE_PRIMITIVE_MAP(HEAP_NUMBER_TYPE, HeapNumber::kSize, heap_number,
Context::NUMBER_FUNCTION_INDEX)
ALLOCATE_PRIMITIVE_MAP(SYMBOL_TYPE, Symbol::kSize, symbol,
Context::SYMBOL_FUNCTION_INDEX)
ALLOCATE_MAP(FOREIGN_TYPE, Foreign::kSize, foreign)
ALLOCATE_PRIMITIVE_MAP(ODDBALL_TYPE, Oddball::kSize, boolean,
Context::BOOLEAN_FUNCTION_INDEX);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, uninitialized);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, arguments_marker);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, exception);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, termination_exception);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, optimized_out);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, stale_register);
ALLOCATE_MAP(ODDBALL_TYPE, Oddball::kSize, self_reference_marker);
ALLOCATE_VARSIZE_MAP(BIGINT_TYPE, bigint);
for (unsigned i = 0; i < arraysize(string_type_table); i++) {
const StringTypeTable& entry = string_type_table[i];
Map map;
if (!AllocateMap(entry.type, entry.size).To(&map)) return false;
map.SetConstructorFunctionIndex(Context::STRING_FUNCTION_INDEX);
// Mark cons string maps as unstable, because their objects can change
// maps during GC.
if (StringShape(entry.type).IsCons()) map.mark_unstable();
roots_table()[entry.index] = map.ptr();
}
{ // Create a separate external one byte string map for native sources.
Map map;
AllocationResult allocation =
AllocateMap(UNCACHED_EXTERNAL_ONE_BYTE_STRING_TYPE,
ExternalOneByteString::kUncachedSize);
if (!allocation.To(&map)) return false;
map.SetConstructorFunctionIndex(Context::STRING_FUNCTION_INDEX);
set_native_source_string_map(map);
}
ALLOCATE_VARSIZE_MAP(FIXED_DOUBLE_ARRAY_TYPE, fixed_double_array)
roots.fixed_double_array_map().set_elements_kind(HOLEY_DOUBLE_ELEMENTS);
ALLOCATE_VARSIZE_MAP(FEEDBACK_METADATA_TYPE, feedback_metadata)
ALLOCATE_VARSIZE_MAP(BYTE_ARRAY_TYPE, byte_array)
ALLOCATE_VARSIZE_MAP(BYTECODE_ARRAY_TYPE, bytecode_array)
ALLOCATE_VARSIZE_MAP(FREE_SPACE_TYPE, free_space)
ALLOCATE_VARSIZE_MAP(PROPERTY_ARRAY_TYPE, property_array)
ALLOCATE_VARSIZE_MAP(SMALL_ORDERED_HASH_MAP_TYPE, small_ordered_hash_map)
ALLOCATE_VARSIZE_MAP(SMALL_ORDERED_HASH_SET_TYPE, small_ordered_hash_set)
ALLOCATE_VARSIZE_MAP(SMALL_ORDERED_NAME_DICTIONARY_TYPE,
small_ordered_name_dictionary)
ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, sloppy_arguments_elements)
ALLOCATE_VARSIZE_MAP(CODE_TYPE, code)
ALLOCATE_MAP(CELL_TYPE, Cell::kSize, cell);
{
// The invalid_prototype_validity_cell is needed for JSObject maps.
Smi value = Smi::FromInt(Map::kPrototypeChainInvalid);
AllocationResult alloc = AllocateRaw(Cell::kSize, AllocationType::kOld);
if (!alloc.To(&obj)) return false;
obj.set_map_after_allocation(roots.cell_map(), SKIP_WRITE_BARRIER);
Cell::cast(obj).set_value(value);
set_invalid_prototype_validity_cell(Cell::cast(obj));
}
ALLOCATE_MAP(PROPERTY_CELL_TYPE, PropertyCell::kSize, global_property_cell)
ALLOCATE_MAP(FILLER_TYPE, kTaggedSize, one_pointer_filler)
ALLOCATE_MAP(FILLER_TYPE, 2 * kTaggedSize, two_pointer_filler)
// The "no closures" and "one closure" FeedbackCell maps need
// to be marked unstable because their objects can change maps.
ALLOCATE_MAP(
FEEDBACK_CELL_TYPE, FeedbackCell::kAlignedSize, no_closures_cell)
roots.no_closures_cell_map().mark_unstable();
ALLOCATE_MAP(
FEEDBACK_CELL_TYPE, FeedbackCell::kAlignedSize, one_closure_cell)
roots.one_closure_cell_map().mark_unstable();
ALLOCATE_MAP(
FEEDBACK_CELL_TYPE, FeedbackCell::kAlignedSize, many_closures_cell)
ALLOCATE_VARSIZE_MAP(TRANSITION_ARRAY_TYPE, transition_array)
ALLOCATE_VARSIZE_MAP(HASH_TABLE_TYPE, hash_table)
ALLOCATE_VARSIZE_MAP(ORDERED_HASH_MAP_TYPE, ordered_hash_map)
ALLOCATE_VARSIZE_MAP(ORDERED_HASH_SET_TYPE, ordered_hash_set)
ALLOCATE_VARSIZE_MAP(ORDERED_NAME_DICTIONARY_TYPE, ordered_name_dictionary)
ALLOCATE_VARSIZE_MAP(NAME_DICTIONARY_TYPE, name_dictionary)
ALLOCATE_VARSIZE_MAP(GLOBAL_DICTIONARY_TYPE, global_dictionary)
ALLOCATE_VARSIZE_MAP(NUMBER_DICTIONARY_TYPE, number_dictionary)
ALLOCATE_VARSIZE_MAP(SIMPLE_NUMBER_DICTIONARY_TYPE,
simple_number_dictionary)
ALLOCATE_VARSIZE_MAP(STRING_TABLE_TYPE, string_table)
ALLOCATE_VARSIZE_MAP(EMBEDDER_DATA_ARRAY_TYPE, embedder_data_array)
ALLOCATE_VARSIZE_MAP(EPHEMERON_HASH_TABLE_TYPE, ephemeron_hash_table)
ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, array_list)
ALLOCATE_VARSIZE_MAP(FUNCTION_CONTEXT_TYPE, function_context)
ALLOCATE_VARSIZE_MAP(CATCH_CONTEXT_TYPE, catch_context)
ALLOCATE_VARSIZE_MAP(WITH_CONTEXT_TYPE, with_context)
ALLOCATE_VARSIZE_MAP(DEBUG_EVALUATE_CONTEXT_TYPE, debug_evaluate_context)
ALLOCATE_VARSIZE_MAP(AWAIT_CONTEXT_TYPE, await_context)
ALLOCATE_VARSIZE_MAP(BLOCK_CONTEXT_TYPE, block_context)
ALLOCATE_VARSIZE_MAP(MODULE_CONTEXT_TYPE, module_context)
ALLOCATE_VARSIZE_MAP(NATIVE_CONTEXT_TYPE, native_context)
ALLOCATE_VARSIZE_MAP(EVAL_CONTEXT_TYPE, eval_context)
ALLOCATE_VARSIZE_MAP(SCRIPT_CONTEXT_TYPE, script_context)
ALLOCATE_VARSIZE_MAP(SCRIPT_CONTEXT_TABLE_TYPE, script_context_table)
ALLOCATE_VARSIZE_MAP(OBJECT_BOILERPLATE_DESCRIPTION_TYPE,
object_boilerplate_description)
ALLOCATE_MAP(CALL_HANDLER_INFO_TYPE, CallHandlerInfo::kSize,
side_effect_call_handler_info)
ALLOCATE_MAP(CALL_HANDLER_INFO_TYPE, CallHandlerInfo::kSize,
side_effect_free_call_handler_info)
ALLOCATE_MAP(CALL_HANDLER_INFO_TYPE, CallHandlerInfo::kSize,
next_call_side_effect_free_call_handler_info)
ALLOCATE_VARSIZE_MAP(PREPARSE_DATA_TYPE, preparse_data)
ALLOCATE_MAP(UNCOMPILED_DATA_WITHOUT_PREPARSE_DATA_TYPE,
UncompiledDataWithoutPreparseData::kSize,
uncompiled_data_without_preparse_data)
ALLOCATE_MAP(UNCOMPILED_DATA_WITH_PREPARSE_DATA_TYPE,
UncompiledDataWithPreparseData::kSize,
uncompiled_data_with_preparse_data)
ALLOCATE_MAP(SHARED_FUNCTION_INFO_TYPE, SharedFunctionInfo::kAlignedSize,
shared_function_info)
ALLOCATE_MAP(SOURCE_TEXT_MODULE_TYPE, SourceTextModule::kSize,
source_text_module)
ALLOCATE_MAP(SYNTHETIC_MODULE_TYPE, SyntheticModule::kSize,
synthetic_module)
ALLOCATE_MAP(CODE_DATA_CONTAINER_TYPE, CodeDataContainer::kSize,
code_data_container)
ALLOCATE_MAP(WEAK_CELL_TYPE, WeakCell::kSize, weak_cell)
ALLOCATE_MAP(JS_MESSAGE_OBJECT_TYPE, JSMessageObject::kSize, message_object)
ALLOCATE_MAP(JS_OBJECT_TYPE, JSObject::kHeaderSize + kEmbedderDataSlotSize,
external)
external_map().set_is_extensible(false);
#undef ALLOCATE_PRIMITIVE_MAP
#undef ALLOCATE_VARSIZE_MAP
#undef ALLOCATE_MAP
}
{
AllocationResult alloc =
AllocateRaw(FixedArray::SizeFor(0), AllocationType::kReadOnly);
if (!alloc.To(&obj)) return false;
obj.set_map_after_allocation(roots.scope_info_map(), SKIP_WRITE_BARRIER);
FixedArray::cast(obj).set_length(0);
}
set_empty_scope_info(ScopeInfo::cast(obj));
{
// Empty boilerplate needs a field for literal_flags
AllocationResult alloc =
AllocateRaw(FixedArray::SizeFor(1), AllocationType::kReadOnly);
if (!alloc.To(&obj)) return false;
obj.set_map_after_allocation(roots.object_boilerplate_description_map(),
SKIP_WRITE_BARRIER);
FixedArray::cast(obj).set_length(1);
FixedArray::cast(obj).set(ObjectBoilerplateDescription::kLiteralTypeOffset,
Smi::kZero);
}
set_empty_object_boilerplate_description(
ObjectBoilerplateDescription::cast(obj));
{
// Empty array boilerplate description
AllocationResult alloc = Allocate(roots.array_boilerplate_description_map(),
AllocationType::kReadOnly);
if (!alloc.To(&obj)) return false;
ArrayBoilerplateDescription::cast(obj).set_constant_elements(
roots.empty_fixed_array());
ArrayBoilerplateDescription::cast(obj).set_elements_kind(
ElementsKind::PACKED_SMI_ELEMENTS);
}
set_empty_array_boilerplate_description(
ArrayBoilerplateDescription::cast(obj));
{
AllocationResult allocation =
Allocate(roots.boolean_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_true_value(Oddball::cast(obj));
Oddball::cast(obj).set_kind(Oddball::kTrue);
{
AllocationResult allocation =
Allocate(roots.boolean_map(), AllocationType::kReadOnly);
if (!allocation.To(&obj)) return false;
}
set_false_value(Oddball::cast(obj));
Oddball::cast(obj).set_kind(Oddball::kFalse);
// Empty arrays.
{
if (!AllocateRaw(ByteArray::SizeFor(0), AllocationType::kReadOnly).To(&obj))
return false;
obj.set_map_after_allocation(roots.byte_array_map(), SKIP_WRITE_BARRIER);
ByteArray::cast(obj).set_length(0);
set_empty_byte_array(ByteArray::cast(obj));
}
{
if (!AllocateRaw(FixedArray::SizeFor(0), AllocationType::kReadOnly)
.To(&obj)) {
return false;
}
obj.set_map_after_allocation(roots.property_array_map(),
SKIP_WRITE_BARRIER);
PropertyArray::cast(obj).initialize_length(0);
set_empty_property_array(PropertyArray::cast(obj));
}
{
if (!AllocateRaw(FixedArray::SizeFor(0), AllocationType::kReadOnly)
.To(&obj)) {
return false;
}
obj.set_map_after_allocation(roots.closure_feedback_cell_array_map(),
SKIP_WRITE_BARRIER);
FixedArray::cast(obj).set_length(0);
set_empty_closure_feedback_cell_array(ClosureFeedbackCellArray::cast(obj));
}
DCHECK(!InYoungGeneration(roots.empty_fixed_array()));
roots.bigint_map().SetConstructorFunctionIndex(
Context::BIGINT_FUNCTION_INDEX);
return true;
}
void Heap::CreateApiObjects() {
Isolate* isolate = this->isolate();
HandleScope scope(isolate);
set_message_listeners(*TemplateList::New(isolate, 2));
Handle<InterceptorInfo> info =
Handle<InterceptorInfo>::cast(isolate->factory()->NewStruct(
INTERCEPTOR_INFO_TYPE, AllocationType::kReadOnly));
info->set_flags(0);
set_noop_interceptor_info(*info);
}
void Heap::CreateInitialObjects() {
HandleScope scope(isolate());
Factory* factory = isolate()->factory();
ReadOnlyRoots roots(this);
// The -0 value must be set before NewNumber works.
set_minus_zero_value(
*factory->NewHeapNumber(-0.0, AllocationType::kReadOnly));
DCHECK(std::signbit(roots.minus_zero_value().Number()));
set_nan_value(*factory->NewHeapNumber(
std::numeric_limits<double>::quiet_NaN(), AllocationType::kReadOnly));
set_hole_nan_value(*factory->NewHeapNumberFromBits(
kHoleNanInt64, AllocationType::kReadOnly));
set_infinity_value(
*factory->NewHeapNumber(V8_INFINITY, AllocationType::kReadOnly));
set_minus_infinity_value(
*factory->NewHeapNumber(-V8_INFINITY, AllocationType::kReadOnly));
set_hash_seed(*factory->NewByteArray(kInt64Size, AllocationType::kReadOnly));
InitializeHashSeed();
// There's no "current microtask" in the beginning.
set_current_microtask(roots.undefined_value());
set_dirty_js_finalization_groups(roots.undefined_value());
set_weak_refs_keep_during_job(roots.undefined_value());
// Allocate cache for single character one byte strings.
set_single_character_string_cache(*factory->NewFixedArray(
String::kMaxOneByteCharCode + 1, AllocationType::kOld));
// Allocate initial string table.
set_string_table(*StringTable::New(isolate(), kInitialStringTableSize));
for (unsigned i = 0; i < arraysize(constant_string_table); i++) {
Handle<String> str =
factory->InternalizeUtf8String(constant_string_table[i].contents);
roots_table()[constant_string_table[i].index] = str->ptr();
}
// Allocate
// Finish initializing oddballs after creating the string table.
Oddball::Initialize(isolate(), factory->undefined_value(), "undefined",
factory->nan_value(), "undefined", Oddball::kUndefined);
// Initialize the null_value.
Oddball::Initialize(isolate(), factory->null_value(), "null",
handle(Smi::kZero, isolate()), "object", Oddball::kNull);
// Initialize the_hole_value.
Oddball::Initialize(isolate(), factory->the_hole_value(), "hole",
factory->hole_nan_value(), "undefined",
Oddball::kTheHole);
// Initialize the true_value.
Oddball::Initialize(isolate(), factory->true_value(), "true",
handle(Smi::FromInt(1), isolate()), "boolean",
Oddball::kTrue);
// Initialize the false_value.
Oddball::Initialize(isolate(), factory->false_value(), "false",
handle(Smi::kZero, isolate()), "boolean",
Oddball::kFalse);
set_uninitialized_value(
*factory->NewOddball(factory->uninitialized_map(), "uninitialized",
handle(Smi::FromInt(-1), isolate()), "undefined",
Oddball::kUninitialized));
set_arguments_marker(
*factory->NewOddball(factory->arguments_marker_map(), "arguments_marker",
handle(Smi::FromInt(-4), isolate()), "undefined",
Oddball::kArgumentsMarker));
set_termination_exception(*factory->NewOddball(
factory->termination_exception_map(), "termination_exception",
handle(Smi::FromInt(-3), isolate()), "undefined", Oddball::kOther));
set_exception(*factory->NewOddball(factory->exception_map(), "exception",
handle(Smi::FromInt(-5), isolate()),
"undefined", Oddball::kException));
set_optimized_out(*factory->NewOddball(factory->optimized_out_map(),
"optimized_out",
handle(Smi::FromInt(-6), isolate()),
"undefined", Oddball::kOptimizedOut));
set_stale_register(
*factory->NewOddball(factory->stale_register_map(), "stale_register",
handle(Smi::FromInt(-7), isolate()), "undefined",
Oddball::kStaleRegister));
// Initialize the self-reference marker.
set_self_reference_marker(
*factory->NewSelfReferenceMarker(AllocationType::kReadOnly));
set_interpreter_entry_trampoline_for_profiling(roots.undefined_value());
{
HandleScope scope(isolate());
#define SYMBOL_INIT(_, name) \
{ \
Handle<Symbol> symbol( \
isolate()->factory()->NewPrivateSymbol(AllocationType::kReadOnly)); \
roots_table()[RootIndex::k##name] = symbol->ptr(); \
}
PRIVATE_SYMBOL_LIST_GENERATOR(SYMBOL_INIT, /* not used */)
#undef SYMBOL_INIT
}
{
HandleScope scope(isolate());
#define SYMBOL_INIT(_, name, description) \
Handle<Symbol> name = factory->NewSymbol(AllocationType::kReadOnly); \
Handle<String> name##d = factory->InternalizeUtf8String(#description); \
name->set_name(*name##d); \
roots_table()[RootIndex::k##name] = name->ptr();
PUBLIC_SYMBOL_LIST_GENERATOR(SYMBOL_INIT, /* not used */)
#undef SYMBOL_INIT
#define SYMBOL_INIT(_, name, description) \
Handle<Symbol> name = factory->NewSymbol(AllocationType::kReadOnly); \
Handle<String> name##d = factory->InternalizeUtf8String(#description); \
name->set_is_well_known_symbol(true); \
name->set_name(*name##d); \
roots_table()[RootIndex::k##name] = name->ptr();
WELL_KNOWN_SYMBOL_LIST_GENERATOR(SYMBOL_INIT, /* not used */)
#undef SYMBOL_INIT
// Mark "Interesting Symbols" appropriately.
to_string_tag_symbol->set_is_interesting_symbol(true);
}
Handle<NameDictionary> empty_property_dictionary = NameDictionary::New(
isolate(), 1, AllocationType::kReadOnly, USE_CUSTOM_MINIMUM_CAPACITY);
DCHECK(!empty_property_dictionary->HasSufficientCapacityToAdd(1));
set_empty_property_dictionary(*empty_property_dictionary);
set_public_symbol_table(*empty_property_dictionary);
set_api_symbol_table(*empty_property_dictionary);
set_api_private_symbol_table(*empty_property_dictionary);
set_number_string_cache(*factory->NewFixedArray(
kInitialNumberStringCacheSize * 2, AllocationType::kOld));
// Allocate cache for string split and regexp-multiple.
set_string_split_cache(*factory->NewFixedArray(
RegExpResultsCache::kRegExpResultsCacheSize, AllocationType::kOld));
set_regexp_multiple_cache(*factory->NewFixedArray(
RegExpResultsCache::kRegExpResultsCacheSize, AllocationType::kOld));
// Allocate FeedbackCell for builtins.
Handle<FeedbackCell> many_closures_cell =
factory->NewManyClosuresCell(factory->undefined_value());
set_many_closures_cell(*many_closures_cell);
{
Handle<FixedArray> empty_sloppy_arguments_elements =
factory->NewFixedArray(2, AllocationType::kReadOnly);
empty_sloppy_arguments_elements->set_map_after_allocation(
roots.sloppy_arguments_elements_map(), SKIP_WRITE_BARRIER);
set_empty_sloppy_arguments_elements(*empty_sloppy_arguments_elements);
}
set_detached_contexts(roots.empty_weak_array_list());
set_retained_maps(roots.empty_weak_array_list());
set_retaining_path_targets(roots.empty_weak_array_list());
set_feedback_vectors_for_profiling_tools(roots.undefined_value());
set_pending_optimize_for_test_bytecode(roots.undefined_value());
set_script_list(roots.empty_weak_array_list());
Handle<NumberDictionary> slow_element_dictionary = NumberDictionary::New(
isolate(), 1, AllocationType::kReadOnly, USE_CUSTOM_MINIMUM_CAPACITY);
DCHECK(!slow_element_dictionary->HasSufficientCapacityToAdd(1));
slow_element_dictionary->set_requires_slow_elements();
set_empty_slow_element_dictionary(*slow_element_dictionary);
set_materialized_objects(*factory->NewFixedArray(0, AllocationType::kOld));
// Handling of script id generation is in Heap::NextScriptId().
set_last_script_id(Smi::FromInt(v8::UnboundScript::kNoScriptId));
set_last_debugging_id(Smi::FromInt(DebugInfo::kNoDebuggingId));
set_next_template_serial_number(Smi::zero());
// Allocate the empty OrderedHashMap.
Handle<FixedArray> empty_ordered_hash_map = factory->NewFixedArray(
OrderedHashMap::HashTableStartIndex(), AllocationType::kReadOnly);
empty_ordered_hash_map->set_map_no_write_barrier(
*factory->ordered_hash_map_map());
for (int i = 0; i < empty_ordered_hash_map->length(); ++i) {
empty_ordered_hash_map->set(i, Smi::kZero);
}
set_empty_ordered_hash_map(*empty_ordered_hash_map);
// Allocate the empty OrderedHashSet.
Handle<FixedArray> empty_ordered_hash_set = factory->NewFixedArray(
OrderedHashSet::HashTableStartIndex(), AllocationType::kReadOnly);
empty_ordered_hash_set->set_map_no_write_barrier(
*factory->ordered_hash_set_map());
for (int i = 0; i < empty_ordered_hash_set->length(); ++i) {
empty_ordered_hash_set->set(i, Smi::kZero);
}
set_empty_ordered_hash_set(*empty_ordered_hash_set);
// Allocate the empty FeedbackMetadata.
Handle<FeedbackMetadata> empty_feedback_metadata =
factory->NewFeedbackMetadata(0, 0, AllocationType::kReadOnly);
set_empty_feedback_metadata(*empty_feedback_metadata);
// Canonical scope arrays.
Handle<ScopeInfo> global_this_binding =
ScopeInfo::CreateGlobalThisBinding(isolate());
set_global_this_binding_scope_info(*global_this_binding);
Handle<ScopeInfo> empty_function =
ScopeInfo::CreateForEmptyFunction(isolate());
set_empty_function_scope_info(*empty_function);
// Allocate the empty script.
Handle<Script> script = factory->NewScript(factory->empty_string());
script->set_type(Script::TYPE_NATIVE);
// This is used for exceptions thrown with no stack frames. Such exceptions
// can be shared everywhere.
script->set_origin_options(ScriptOriginOptions(true, false));
set_empty_script(*script);
Handle<Cell> array_constructor_cell = factory->NewCell(
handle(Smi::FromInt(Isolate::kProtectorValid), isolate()));
set_array_constructor_protector(*array_constructor_cell);
Handle<PropertyCell> cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_no_elements_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string(),
AllocationType::kReadOnly);
cell->set_value(roots.the_hole_value());
set_empty_property_cell(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_array_iterator_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_map_iterator_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_set_iterator_protector(*cell);
Handle<Cell> is_concat_spreadable_cell = factory->NewCell(
handle(Smi::FromInt(Isolate::kProtectorValid), isolate()));
set_is_concat_spreadable_protector(*is_concat_spreadable_cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_array_species_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_typed_array_species_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_promise_species_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_string_iterator_protector(*cell);
Handle<Cell> string_length_overflow_cell = factory->NewCell(
handle(Smi::FromInt(Isolate::kProtectorValid), isolate()));
set_string_length_protector(*string_length_overflow_cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_array_buffer_detaching_protector(*cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_promise_hook_protector(*cell);
Handle<Cell> promise_resolve_cell = factory->NewCell(
handle(Smi::FromInt(Isolate::kProtectorValid), isolate()));
set_promise_resolve_protector(*promise_resolve_cell);
cell = factory->NewPropertyCell(factory->empty_string());
cell->set_value(Smi::FromInt(Isolate::kProtectorValid));
set_promise_then_protector(*cell);
set_serialized_objects(roots.empty_fixed_array());
set_serialized_global_proxy_sizes(roots.empty_fixed_array());
set_noscript_shared_function_infos(roots.empty_weak_array_list());
/* Canonical off-heap trampoline data */
set_off_heap_trampoline_relocation_info(
*Builtins::GenerateOffHeapTrampolineRelocInfo(isolate_));
set_trampoline_trivial_code_data_container(
*isolate()->factory()->NewCodeDataContainer(0,
AllocationType::kReadOnly));
set_trampoline_promise_rejection_code_data_container(
*isolate()->factory()->NewCodeDataContainer(
Code::IsPromiseRejectionField::encode(true),
AllocationType::kReadOnly));
// Evaluate the hash values which will then be cached in the strings.
isolate()->factory()->zero_string()->Hash();
isolate()->factory()->one_string()->Hash();
// Initialize builtins constants table.
set_builtins_constants_table(roots.empty_fixed_array());
// Initialize descriptor cache.
isolate_->descriptor_lookup_cache()->Clear();
// Initialize compilation cache.
isolate_->compilation_cache()->Clear();
}
void Heap::CreateInternalAccessorInfoObjects() {
Isolate* isolate = this->isolate();
HandleScope scope(isolate);
Handle<AccessorInfo> accessor_info;
#define INIT_ACCESSOR_INFO(_, accessor_name, AccessorName, ...) \
accessor_info = Accessors::Make##AccessorName##Info(isolate); \
roots_table()[RootIndex::k##AccessorName##Accessor] = accessor_info->ptr();
ACCESSOR_INFO_LIST_GENERATOR(INIT_ACCESSOR_INFO, /* not used */)
#undef INIT_ACCESSOR_INFO
#define INIT_SIDE_EFFECT_FLAG(_, accessor_name, AccessorName, GetterType, \
SetterType) \
AccessorInfo::cast( \
Object(roots_table()[RootIndex::k##AccessorName##Accessor])) \
.set_getter_side_effect_type(SideEffectType::GetterType); \
AccessorInfo::cast( \
Object(roots_table()[RootIndex::k##AccessorName##Accessor])) \
.set_setter_side_effect_type(SideEffectType::SetterType);
ACCESSOR_INFO_LIST_GENERATOR(INIT_SIDE_EFFECT_FLAG, /* not used */)
#undef INIT_SIDE_EFFECT_FLAG
}
} // namespace internal
} // namespace v8