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v8/src/bootstrapper.cc
bmeurer d49bb69a5e [runtime] Make elements backing store for arguments non-holey. 
Change sloppy and strict arguments objects to FAST_ELEMENTS for their
backing stores, which will allow us to optimize them easier. Also fixes
a bug in the elements accessors that was triggered by this change.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1433133003

Cr-Commit-Position: refs/heads/master@{#31942}
2015-11-11 12:08:48 +00:00

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// 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/bootstrapper.h"
#include "src/accessors.h"
#include "src/api-natives.h"
#include "src/code-stubs.h"
#include "src/extensions/externalize-string-extension.h"
#include "src/extensions/free-buffer-extension.h"
#include "src/extensions/gc-extension.h"
#include "src/extensions/statistics-extension.h"
#include "src/extensions/trigger-failure-extension.h"
#include "src/heap/heap.h"
#include "src/isolate-inl.h"
#include "src/snapshot/natives.h"
#include "src/snapshot/snapshot.h"
#include "third_party/fdlibm/fdlibm.h"
#if defined(V8_WASM)
#include "src/wasm/wasm-js.h"
#endif
namespace v8 {
namespace internal {
Bootstrapper::Bootstrapper(Isolate* isolate)
: isolate_(isolate),
nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION) {}
template <class Source>
Handle<String> Bootstrapper::SourceLookup(int index) {
DCHECK(0 <= index && index < Source::GetBuiltinsCount());
Heap* heap = isolate_->heap();
if (Source::GetSourceCache(heap)->get(index)->IsUndefined()) {
// We can use external strings for the natives.
Vector<const char> source = Source::GetScriptSource(index);
NativesExternalStringResource* resource =
new NativesExternalStringResource(source.start(), source.length());
// We do not expect this to throw an exception. Change this if it does.
Handle<String> source_code = isolate_->factory()
->NewExternalStringFromOneByte(resource)
.ToHandleChecked();
// Mark this external string with a special map.
source_code->set_map(isolate_->heap()->native_source_string_map());
Source::GetSourceCache(heap)->set(index, *source_code);
}
Handle<Object> cached_source(Source::GetSourceCache(heap)->get(index),
isolate_);
return Handle<String>::cast(cached_source);
}
template Handle<String> Bootstrapper::SourceLookup<Natives>(int index);
template Handle<String> Bootstrapper::SourceLookup<ExperimentalNatives>(
int index);
template Handle<String> Bootstrapper::SourceLookup<ExperimentalExtraNatives>(
int index);
template Handle<String> Bootstrapper::SourceLookup<ExtraNatives>(int index);
template Handle<String> Bootstrapper::SourceLookup<CodeStubNatives>(int index);
void Bootstrapper::Initialize(bool create_heap_objects) {
extensions_cache_.Initialize(isolate_, create_heap_objects);
}
static const char* GCFunctionName() {
bool flag_given = FLAG_expose_gc_as != NULL && strlen(FLAG_expose_gc_as) != 0;
return flag_given ? FLAG_expose_gc_as : "gc";
}
v8::Extension* Bootstrapper::free_buffer_extension_ = NULL;
v8::Extension* Bootstrapper::gc_extension_ = NULL;
v8::Extension* Bootstrapper::externalize_string_extension_ = NULL;
v8::Extension* Bootstrapper::statistics_extension_ = NULL;
v8::Extension* Bootstrapper::trigger_failure_extension_ = NULL;
void Bootstrapper::InitializeOncePerProcess() {
free_buffer_extension_ = new FreeBufferExtension;
v8::RegisterExtension(free_buffer_extension_);
gc_extension_ = new GCExtension(GCFunctionName());
v8::RegisterExtension(gc_extension_);
externalize_string_extension_ = new ExternalizeStringExtension;
v8::RegisterExtension(externalize_string_extension_);
statistics_extension_ = new StatisticsExtension;
v8::RegisterExtension(statistics_extension_);
trigger_failure_extension_ = new TriggerFailureExtension;
v8::RegisterExtension(trigger_failure_extension_);
}
void Bootstrapper::TearDownExtensions() {
delete free_buffer_extension_;
free_buffer_extension_ = NULL;
delete gc_extension_;
gc_extension_ = NULL;
delete externalize_string_extension_;
externalize_string_extension_ = NULL;
delete statistics_extension_;
statistics_extension_ = NULL;
delete trigger_failure_extension_;
trigger_failure_extension_ = NULL;
}
void DeleteNativeSources(Object* maybe_array) {
if (maybe_array->IsFixedArray()) {
FixedArray* array = FixedArray::cast(maybe_array);
for (int i = 0; i < array->length(); i++) {
Object* natives_source = array->get(i);
if (!natives_source->IsUndefined()) {
const NativesExternalStringResource* resource =
reinterpret_cast<const NativesExternalStringResource*>(
ExternalOneByteString::cast(natives_source)->resource());
delete resource;
}
}
}
}
void Bootstrapper::TearDown() {
DeleteNativeSources(Natives::GetSourceCache(isolate_->heap()));
DeleteNativeSources(ExperimentalNatives::GetSourceCache(isolate_->heap()));
DeleteNativeSources(ExtraNatives::GetSourceCache(isolate_->heap()));
DeleteNativeSources(
ExperimentalExtraNatives::GetSourceCache(isolate_->heap()));
DeleteNativeSources(CodeStubNatives::GetSourceCache(isolate_->heap()));
extensions_cache_.Initialize(isolate_, false); // Yes, symmetrical
}
class Genesis BASE_EMBEDDED {
public:
Genesis(Isolate* isolate, MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions, ContextType context_type);
~Genesis() { }
Isolate* isolate() const { return isolate_; }
Factory* factory() const { return isolate_->factory(); }
Heap* heap() const { return isolate_->heap(); }
Handle<Context> result() { return result_; }
private:
Handle<Context> native_context() { return native_context_; }
// Creates some basic objects. Used for creating a context from scratch.
void CreateRoots();
// Creates the empty function. Used for creating a context from scratch.
Handle<JSFunction> CreateEmptyFunction(Isolate* isolate);
// Creates the ThrowTypeError function. ECMA 5th Ed. 13.2.3
Handle<JSFunction> GetRestrictedFunctionPropertiesThrower();
Handle<JSFunction> GetStrictArgumentsPoisonFunction();
Handle<JSFunction> GetThrowTypeErrorIntrinsic(Builtins::Name builtin_name);
void CreateStrictModeFunctionMaps(Handle<JSFunction> empty);
void CreateStrongModeFunctionMaps(Handle<JSFunction> empty);
void CreateIteratorMaps();
// Make the "arguments" and "caller" properties throw a TypeError on access.
void AddRestrictedFunctionProperties(Handle<Map> map);
// Creates the global objects using the global proxy and the template passed
// in through the API. We call this regardless of whether we are building a
// context from scratch or using a deserialized one from the partial snapshot
// but in the latter case we don't use the objects it produces directly, as
// we have to used the deserialized ones that are linked together with the
// rest of the context snapshot.
Handle<JSGlobalObject> CreateNewGlobals(
v8::Local<v8::ObjectTemplate> global_proxy_template,
Handle<JSGlobalProxy> global_proxy);
// Hooks the given global proxy into the context. If the context was created
// by deserialization then this will unhook the global proxy that was
// deserialized, leaving the GC to pick it up.
void HookUpGlobalProxy(Handle<JSGlobalObject> global_object,
Handle<JSGlobalProxy> global_proxy);
// Similarly, we want to use the global that has been created by the templates
// passed through the API. The global from the snapshot is detached from the
// other objects in the snapshot.
void HookUpGlobalObject(Handle<JSGlobalObject> global_object,
Handle<FixedArray> outdated_contexts);
// The native context has a ScriptContextTable that store declarative bindings
// made in script scopes. Add a "this" binding to that table pointing to the
// global proxy.
void InstallGlobalThisBinding();
void HookUpGlobalThisBinding(Handle<FixedArray> outdated_contexts);
// New context initialization. Used for creating a context from scratch.
void InitializeGlobal(Handle<JSGlobalObject> global_object,
Handle<JSFunction> empty_function,
ContextType context_type);
void InitializeExperimentalGlobal();
// Depending on the situation, expose and/or get rid of the utils object.
void ConfigureUtilsObject(ContextType context_type);
#define DECLARE_FEATURE_INITIALIZATION(id, descr) \
void InitializeGlobal_##id();
HARMONY_INPROGRESS(DECLARE_FEATURE_INITIALIZATION)
HARMONY_STAGED(DECLARE_FEATURE_INITIALIZATION)
HARMONY_SHIPPING(DECLARE_FEATURE_INITIALIZATION)
#undef DECLARE_FEATURE_INITIALIZATION
Handle<JSFunction> InstallInternalArray(Handle<JSObject> target,
const char* name,
ElementsKind elements_kind);
bool InstallNatives(ContextType context_type);
void InstallTypedArray(const char* name, ElementsKind elements_kind,
Handle<JSFunction>* fun);
bool InstallExperimentalNatives();
bool InstallExtraNatives();
bool InstallExperimentalExtraNatives();
bool InstallDebuggerNatives();
void InstallBuiltinFunctionIds();
void InstallExperimentalBuiltinFunctionIds();
void InitializeNormalizedMapCaches();
enum ExtensionTraversalState {
UNVISITED, VISITED, INSTALLED
};
class ExtensionStates {
public:
ExtensionStates();
ExtensionTraversalState get_state(RegisteredExtension* extension);
void set_state(RegisteredExtension* extension,
ExtensionTraversalState state);
private:
HashMap map_;
DISALLOW_COPY_AND_ASSIGN(ExtensionStates);
};
// Used both for deserialized and from-scratch contexts to add the extensions
// provided.
static bool InstallExtensions(Handle<Context> native_context,
v8::ExtensionConfiguration* extensions);
static bool InstallAutoExtensions(Isolate* isolate,
ExtensionStates* extension_states);
static bool InstallRequestedExtensions(Isolate* isolate,
v8::ExtensionConfiguration* extensions,
ExtensionStates* extension_states);
static bool InstallExtension(Isolate* isolate,
const char* name,
ExtensionStates* extension_states);
static bool InstallExtension(Isolate* isolate,
v8::RegisteredExtension* current,
ExtensionStates* extension_states);
static bool InstallSpecialObjects(Handle<Context> native_context);
bool ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template);
bool ConfigureGlobalObjects(
v8::Local<v8::ObjectTemplate> global_proxy_template);
// Migrates all properties from the 'from' object to the 'to'
// object and overrides the prototype in 'to' with the one from
// 'from'.
void TransferObject(Handle<JSObject> from, Handle<JSObject> to);
void TransferNamedProperties(Handle<JSObject> from, Handle<JSObject> to);
void TransferIndexedProperties(Handle<JSObject> from, Handle<JSObject> to);
enum FunctionMode {
// With prototype.
FUNCTION_WITH_WRITEABLE_PROTOTYPE,
FUNCTION_WITH_READONLY_PROTOTYPE,
// Without prototype.
FUNCTION_WITHOUT_PROTOTYPE,
BOUND_FUNCTION
};
static bool IsFunctionModeWithPrototype(FunctionMode function_mode) {
return (function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ||
function_mode == FUNCTION_WITH_READONLY_PROTOTYPE);
}
Handle<Map> CreateSloppyFunctionMap(FunctionMode function_mode);
void SetFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode);
void MakeFunctionInstancePrototypeWritable();
Handle<Map> CreateStrictFunctionMap(FunctionMode function_mode,
Handle<JSFunction> empty_function);
Handle<Map> CreateStrongFunctionMap(Handle<JSFunction> empty_function,
bool is_constructor);
void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode);
void SetStrongFunctionInstanceDescriptor(Handle<Map> map);
static bool CallUtilsFunction(Isolate* isolate, const char* name);
static bool CompileExtension(Isolate* isolate, v8::Extension* extension);
Isolate* isolate_;
Handle<Context> result_;
Handle<Context> native_context_;
// Function maps. Function maps are created initially with a read only
// prototype for the processing of JS builtins. Later the function maps are
// replaced in order to make prototype writable. These are the final, writable
// prototype, maps.
Handle<Map> sloppy_function_map_writable_prototype_;
Handle<Map> strict_function_map_writable_prototype_;
Handle<JSFunction> strict_poison_function_;
Handle<JSFunction> restricted_function_properties_thrower_;
BootstrapperActive active_;
friend class Bootstrapper;
};
void Bootstrapper::Iterate(ObjectVisitor* v) {
extensions_cache_.Iterate(v);
v->Synchronize(VisitorSynchronization::kExtensions);
}
Handle<Context> Bootstrapper::CreateEnvironment(
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions, ContextType context_type) {
HandleScope scope(isolate_);
Genesis genesis(isolate_, maybe_global_proxy, global_proxy_template,
extensions, context_type);
Handle<Context> env = genesis.result();
if (env.is_null() ||
(context_type != THIN_CONTEXT && !InstallExtensions(env, extensions))) {
return Handle<Context>();
}
return scope.CloseAndEscape(env);
}
bool Bootstrapper::CreateCodeStubContext(Isolate* isolate) {
HandleScope scope(isolate);
SaveContext save_context(isolate);
BootstrapperActive active(this);
v8::ExtensionConfiguration no_extensions;
Handle<Context> native_context = CreateEnvironment(
MaybeHandle<JSGlobalProxy>(), v8::Local<v8::ObjectTemplate>(),
&no_extensions, THIN_CONTEXT);
isolate->heap()->SetRootCodeStubContext(*native_context);
isolate->set_context(*native_context);
Handle<JSObject> code_stub_exports =
isolate->factory()->NewJSObject(isolate->object_function());
JSObject::NormalizeProperties(code_stub_exports, CLEAR_INOBJECT_PROPERTIES, 2,
"container to export to extra natives");
isolate->heap()->SetRootCodeStubExportsObject(*code_stub_exports);
return InstallCodeStubNatives(isolate);
}
static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) {
// object.__proto__ = proto;
Handle<Map> old_map = Handle<Map>(object->map());
Handle<Map> new_map = Map::Copy(old_map, "SetObjectPrototype");
Map::SetPrototype(new_map, proto, FAST_PROTOTYPE);
JSObject::MigrateToMap(object, new_map);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
env->GetIsolate()->counters()->errors_thrown_per_context()->AddSample(
env->GetErrorsThrown());
Factory* factory = env->GetIsolate()->factory();
Handle<JSGlobalProxy> global_proxy(JSGlobalProxy::cast(env->global_proxy()));
global_proxy->set_native_context(*factory->null_value());
SetObjectPrototype(global_proxy, factory->null_value());
global_proxy->map()->SetConstructor(*factory->null_value());
if (FLAG_track_detached_contexts) {
env->GetIsolate()->AddDetachedContext(env);
}
}
namespace {
Handle<JSFunction> InstallFunction(Handle<JSObject> target, Handle<Name> name,
InstanceType type, int instance_size,
MaybeHandle<JSObject> maybe_prototype,
Builtins::Name call,
PropertyAttributes attributes,
bool strict_function_map = false) {
Isolate* isolate = target->GetIsolate();
Factory* factory = isolate->factory();
Handle<String> name_string = Name::ToFunctionName(name).ToHandleChecked();
Handle<Code> call_code = Handle<Code>(isolate->builtins()->builtin(call));
Handle<JSObject> prototype;
static const bool kReadOnlyPrototype = false;
static const bool kInstallConstructor = false;
Handle<JSFunction> function =
maybe_prototype.ToHandle(&prototype)
? factory->NewFunction(name_string, call_code, prototype, type,
instance_size, kReadOnlyPrototype,
kInstallConstructor, strict_function_map)
: factory->NewFunctionWithoutPrototype(name_string, call_code,
strict_function_map);
JSObject::AddProperty(target, name, function, attributes);
if (target->IsJSGlobalObject()) {
function->shared()->set_instance_class_name(*name_string);
}
function->shared()->set_native(true);
return function;
}
Handle<JSFunction> InstallFunction(Handle<JSObject> target, const char* name,
InstanceType type, int instance_size,
MaybeHandle<JSObject> maybe_prototype,
Builtins::Name call,
bool strict_function_map = false) {
Factory* const factory = target->GetIsolate()->factory();
PropertyAttributes attributes = DONT_ENUM;
return InstallFunction(target, factory->InternalizeUtf8String(name), type,
instance_size, maybe_prototype, call, attributes,
strict_function_map);
}
} // namespace
void Genesis::SetFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
Map::EnsureDescriptorSlack(map, size);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
PropertyAttributes roc_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), roc_attribs);
{ // Add length.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
length, roc_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), ro_attribs);
{ // Add name.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(name->name())), name,
roc_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> args =
Accessors::FunctionArgumentsInfo(isolate(), ro_attribs);
{ // Add arguments.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(args->name())), args,
ro_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> caller =
Accessors::FunctionCallerInfo(isolate(), ro_attribs);
{ // Add caller.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(caller->name())),
caller, ro_attribs);
map->AppendDescriptor(&d);
}
if (IsFunctionModeWithPrototype(function_mode)) {
if (function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE) {
ro_attribs = static_cast<PropertyAttributes>(ro_attribs & ~READ_ONLY);
}
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), ro_attribs);
AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
prototype, ro_attribs);
map->AppendDescriptor(&d);
}
}
Handle<Map> Genesis::CreateSloppyFunctionMap(FunctionMode function_mode) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetFunctionInstanceDescriptor(map, function_mode);
map->set_is_constructor(IsFunctionModeWithPrototype(function_mode));
map->set_is_callable();
return map;
}
Handle<JSFunction> Genesis::CreateEmptyFunction(Isolate* isolate) {
// Allocate the map for function instances. Maps are allocated first and their
// prototypes patched later, once empty function is created.
// Functions with this map will not have a 'prototype' property, and
// can not be used as constructors.
Handle<Map> function_without_prototype_map =
CreateSloppyFunctionMap(FUNCTION_WITHOUT_PROTOTYPE);
native_context()->set_sloppy_function_without_prototype_map(
*function_without_prototype_map);
// Allocate the function map. This map is temporary, used only for processing
// of builtins.
// Later the map is replaced with writable prototype map, allocated below.
Handle<Map> function_map =
CreateSloppyFunctionMap(FUNCTION_WITH_READONLY_PROTOTYPE);
native_context()->set_sloppy_function_map(*function_map);
native_context()->set_sloppy_function_with_readonly_prototype_map(
*function_map);
// The final map for functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
sloppy_function_map_writable_prototype_ =
CreateSloppyFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE);
Factory* factory = isolate->factory();
Handle<String> object_name = factory->Object_string();
Handle<JSObject> object_function_prototype;
{ // --- O b j e c t ---
Handle<JSFunction> object_fun = factory->NewFunction(object_name);
int unused = JSObject::kInitialGlobalObjectUnusedPropertiesCount;
int instance_size = JSObject::kHeaderSize + kPointerSize * unused;
Handle<Map> object_function_map =
factory->NewMap(JS_OBJECT_TYPE, instance_size);
object_function_map->SetInObjectProperties(unused);
JSFunction::SetInitialMap(object_fun, object_function_map,
isolate->factory()->null_value());
object_function_map->set_unused_property_fields(unused);
native_context()->set_object_function(*object_fun);
// Allocate a new prototype for the object function.
object_function_prototype =
factory->NewJSObject(isolate->object_function(), TENURED);
Handle<Map> map = Map::Copy(handle(object_function_prototype->map()),
"EmptyObjectPrototype");
map->set_is_prototype_map(true);
object_function_prototype->set_map(*map);
native_context()->set_initial_object_prototype(*object_function_prototype);
// For bootstrapping set the array prototype to be the same as the object
// prototype, otherwise the missing initial_array_prototype will cause
// assertions during startup.
native_context()->set_initial_array_prototype(*object_function_prototype);
Accessors::FunctionSetPrototype(object_fun, object_function_prototype)
.Assert();
// Allocate initial strong object map.
Handle<Map> strong_object_map =
Map::Copy(Handle<Map>(object_fun->initial_map()), "EmptyStrongObject");
strong_object_map->set_is_strong();
native_context()->set_js_object_strong_map(*strong_object_map);
}
// Allocate the empty function as the prototype for function - ES6 19.2.3
Handle<Code> code(isolate->builtins()->builtin(Builtins::kEmptyFunction));
Handle<JSFunction> empty_function =
factory->NewFunctionWithoutPrototype(factory->empty_string(), code);
// Allocate the function map first and then patch the prototype later
Handle<Map> empty_function_map =
CreateSloppyFunctionMap(FUNCTION_WITHOUT_PROTOTYPE);
DCHECK(!empty_function_map->is_dictionary_map());
Map::SetPrototype(empty_function_map, object_function_prototype);
empty_function_map->set_is_prototype_map(true);
empty_function->set_map(*empty_function_map);
// --- E m p t y ---
Handle<String> source = factory->NewStringFromStaticChars("() {}");
Handle<Script> script = factory->NewScript(source);
script->set_type(Script::TYPE_NATIVE);
empty_function->shared()->set_start_position(0);
empty_function->shared()->set_end_position(source->length());
empty_function->shared()->DontAdaptArguments();
SharedFunctionInfo::SetScript(handle(empty_function->shared()), script);
// Set prototypes for the function maps.
Handle<Map> sloppy_function_map(native_context()->sloppy_function_map(),
isolate);
Handle<Map> sloppy_function_without_prototype_map(
native_context()->sloppy_function_without_prototype_map(), isolate);
Map::SetPrototype(sloppy_function_map, empty_function);
Map::SetPrototype(sloppy_function_without_prototype_map, empty_function);
Map::SetPrototype(sloppy_function_map_writable_prototype_, empty_function);
// ES6 draft 03-17-2015, section 8.2.2 step 12
AddRestrictedFunctionProperties(empty_function_map);
return empty_function;
}
void Genesis::SetStrictFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
Map::EnsureDescriptorSlack(map, size);
PropertyAttributes rw_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
PropertyAttributes roc_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
if (function_mode == BOUND_FUNCTION) {
{ // Add length.
Handle<String> length_string = isolate()->factory()->length_string();
DataDescriptor d(length_string, 0, roc_attribs, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // Add name.
Handle<String> name_string = isolate()->factory()->name_string();
DataDescriptor d(name_string, 1, roc_attribs, Representation::Tagged());
map->AppendDescriptor(&d);
}
} else {
DCHECK(function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ||
function_mode == FUNCTION_WITH_READONLY_PROTOTYPE ||
function_mode == FUNCTION_WITHOUT_PROTOTYPE);
{ // Add length.
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), roc_attribs);
AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
length, roc_attribs);
map->AppendDescriptor(&d);
}
{ // Add name.
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), roc_attribs);
AccessorConstantDescriptor d(Handle<Name>(Name::cast(name->name())), name,
roc_attribs);
map->AppendDescriptor(&d);
}
}
if (IsFunctionModeWithPrototype(function_mode)) {
// Add prototype.
PropertyAttributes attribs =
function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ? rw_attribs
: ro_attribs;
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), attribs);
AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
prototype, attribs);
map->AppendDescriptor(&d);
}
}
void Genesis::SetStrongFunctionInstanceDescriptor(Handle<Map> map) {
Map::EnsureDescriptorSlack(map, 2);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), ro_attribs);
{ // Add length.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
length, ro_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), ro_attribs);
{ // Add name.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(name->name())), name,
ro_attribs);
map->AppendDescriptor(&d);
}
}
// Creates the %ThrowTypeError% function.
Handle<JSFunction> Genesis::GetThrowTypeErrorIntrinsic(
Builtins::Name builtin_name) {
Handle<String> name =
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("ThrowTypeError"));
Handle<Code> code(isolate()->builtins()->builtin(builtin_name));
Handle<JSFunction> function =
factory()->NewFunctionWithoutPrototype(name, code);
function->set_map(native_context()->sloppy_function_map());
function->shared()->DontAdaptArguments();
// %ThrowTypeError% must not have a name property.
JSReceiver::DeleteProperty(function, factory()->name_string()).Assert();
// length needs to be non configurable.
Handle<Object> value(Smi::FromInt(function->shared()->length()), isolate());
JSObject::SetOwnPropertyIgnoreAttributes(
function, factory()->length_string(), value,
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY))
.Assert();
if (JSObject::PreventExtensions(function, Object::THROW_ON_ERROR).IsNothing())
DCHECK(false);
return function;
}
// ECMAScript 5th Edition, 13.2.3
Handle<JSFunction> Genesis::GetRestrictedFunctionPropertiesThrower() {
if (restricted_function_properties_thrower_.is_null()) {
restricted_function_properties_thrower_ = GetThrowTypeErrorIntrinsic(
Builtins::kRestrictedFunctionPropertiesThrower);
}
return restricted_function_properties_thrower_;
}
Handle<JSFunction> Genesis::GetStrictArgumentsPoisonFunction() {
if (strict_poison_function_.is_null()) {
strict_poison_function_ = GetThrowTypeErrorIntrinsic(
Builtins::kRestrictedStrictArgumentsPropertiesThrower);
}
return strict_poison_function_;
}
Handle<Map> Genesis::CreateStrictFunctionMap(
FunctionMode function_mode, Handle<JSFunction> empty_function) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetStrictFunctionInstanceDescriptor(map, function_mode);
map->set_is_constructor(IsFunctionModeWithPrototype(function_mode));
map->set_is_callable();
Map::SetPrototype(map, empty_function);
return map;
}
Handle<Map> Genesis::CreateStrongFunctionMap(
Handle<JSFunction> empty_function, bool is_constructor) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetStrongFunctionInstanceDescriptor(map);
map->set_is_constructor(is_constructor);
Map::SetPrototype(map, empty_function);
map->set_is_callable();
map->set_is_extensible(is_constructor);
map->set_is_strong();
return map;
}
void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
// Allocate map for the prototype-less strict mode instances.
Handle<Map> strict_function_without_prototype_map =
CreateStrictFunctionMap(FUNCTION_WITHOUT_PROTOTYPE, empty);
native_context()->set_strict_function_without_prototype_map(
*strict_function_without_prototype_map);
// Allocate map for the strict mode functions. This map is temporary, used
// only for processing of builtins.
// Later the map is replaced with writable prototype map, allocated below.
Handle<Map> strict_function_map =
CreateStrictFunctionMap(FUNCTION_WITH_READONLY_PROTOTYPE, empty);
native_context()->set_strict_function_map(*strict_function_map);
// The final map for the strict mode functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
strict_function_map_writable_prototype_ =
CreateStrictFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE, empty);
// Special map for non-constructor bound functions.
// TODO(bmeurer): Bound functions should not be represented as JSFunctions.
Handle<Map> bound_function_without_constructor_map =
CreateStrictFunctionMap(BOUND_FUNCTION, empty);
native_context()->set_bound_function_without_constructor_map(
*bound_function_without_constructor_map);
// Special map for constructor bound functions.
// TODO(bmeurer): Bound functions should not be represented as JSFunctions.
Handle<Map> bound_function_with_constructor_map =
Map::Copy(bound_function_without_constructor_map, "IsConstructor");
bound_function_with_constructor_map->set_is_constructor(true);
native_context()->set_bound_function_with_constructor_map(
*bound_function_with_constructor_map);
}
void Genesis::CreateStrongModeFunctionMaps(Handle<JSFunction> empty) {
// Allocate map for strong mode instances, which never have prototypes.
Handle<Map> strong_function_map = CreateStrongFunctionMap(empty, false);
native_context()->set_strong_function_map(*strong_function_map);
// Constructors do, though.
Handle<Map> strong_constructor_map = CreateStrongFunctionMap(empty, true);
native_context()->set_strong_constructor_map(*strong_constructor_map);
}
void Genesis::CreateIteratorMaps() {
// Create iterator-related meta-objects.
Handle<JSObject> iterator_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Handle<JSObject> generator_object_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Handle<JSObject> generator_function_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SetObjectPrototype(generator_object_prototype, iterator_prototype);
JSObject::AddProperty(generator_function_prototype,
factory()->InternalizeUtf8String("prototype"),
generator_object_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
// Create maps for generator functions and their prototypes. Store those
// maps in the native context. The "prototype" property descriptor is
// writable, non-enumerable, and non-configurable (as per ES6 draft
// 04-14-15, section 25.2.4.3).
Handle<Map> strict_function_map(strict_function_map_writable_prototype_);
// Generator functions do not have "caller" or "arguments" accessors.
Handle<Map> sloppy_generator_function_map =
Map::Copy(strict_function_map, "SloppyGeneratorFunction");
Map::SetPrototype(sloppy_generator_function_map,
generator_function_prototype);
native_context()->set_sloppy_generator_function_map(
*sloppy_generator_function_map);
Handle<Map> strict_generator_function_map =
Map::Copy(strict_function_map, "StrictGeneratorFunction");
Map::SetPrototype(strict_generator_function_map,
generator_function_prototype);
native_context()->set_strict_generator_function_map(
*strict_generator_function_map);
Handle<Map> strong_function_map(native_context()->strong_function_map());
Handle<Map> strong_generator_function_map =
Map::Copy(strong_function_map, "StrongGeneratorFunction");
Map::SetPrototype(strong_generator_function_map,
generator_function_prototype);
native_context()->set_strong_generator_function_map(
*strong_generator_function_map);
Handle<JSFunction> object_function(native_context()->object_function());
Handle<Map> generator_object_prototype_map = Map::Create(isolate(), 0);
Map::SetPrototype(generator_object_prototype_map, generator_object_prototype);
native_context()->set_generator_object_prototype_map(
*generator_object_prototype_map);
}
static void ReplaceAccessors(Handle<Map> map,
Handle<String> name,
PropertyAttributes attributes,
Handle<AccessorPair> accessor_pair) {
DescriptorArray* descriptors = map->instance_descriptors();
int idx = descriptors->SearchWithCache(*name, *map);
AccessorConstantDescriptor descriptor(name, accessor_pair, attributes);
descriptors->Replace(idx, &descriptor);
}
void Genesis::AddRestrictedFunctionProperties(Handle<Map> map) {
PropertyAttributes rw_attribs = static_cast<PropertyAttributes>(DONT_ENUM);
Handle<JSFunction> thrower = GetRestrictedFunctionPropertiesThrower();
Handle<AccessorPair> accessors = factory()->NewAccessorPair();
accessors->set_getter(*thrower);
accessors->set_setter(*thrower);
ReplaceAccessors(map, factory()->arguments_string(), rw_attribs, accessors);
ReplaceAccessors(map, factory()->caller_string(), rw_attribs, accessors);
}
static void AddToWeakNativeContextList(Context* context) {
DCHECK(context->IsNativeContext());
Heap* heap = context->GetIsolate()->heap();
#ifdef DEBUG
{ // NOLINT
DCHECK(context->get(Context::NEXT_CONTEXT_LINK)->IsUndefined());
// Check that context is not in the list yet.
for (Object* current = heap->native_contexts_list();
!current->IsUndefined();
current = Context::cast(current)->get(Context::NEXT_CONTEXT_LINK)) {
DCHECK(current != context);
}
}
#endif
context->set(Context::NEXT_CONTEXT_LINK, heap->native_contexts_list(),
UPDATE_WEAK_WRITE_BARRIER);
heap->set_native_contexts_list(context);
}
void Genesis::CreateRoots() {
// Allocate the native context FixedArray first and then patch the
// closure and extension object later (we need the empty function
// and the global object, but in order to create those, we need the
// native context).
native_context_ = factory()->NewNativeContext();
AddToWeakNativeContextList(*native_context());
isolate()->set_context(*native_context());
// Allocate the message listeners object.
{
v8::NeanderArray listeners(isolate());
native_context()->set_message_listeners(*listeners.value());
}
}
void Genesis::InstallGlobalThisBinding() {
Handle<ScriptContextTable> script_contexts(
native_context()->script_context_table());
Handle<ScopeInfo> scope_info = ScopeInfo::CreateGlobalThisBinding(isolate());
Handle<JSFunction> closure(native_context()->closure());
Handle<Context> context = factory()->NewScriptContext(closure, scope_info);
// Go ahead and hook it up while we're at it.
int slot = scope_info->ReceiverContextSlotIndex();
DCHECK_EQ(slot, Context::MIN_CONTEXT_SLOTS);
context->set(slot, native_context()->global_proxy());
Handle<ScriptContextTable> new_script_contexts =
ScriptContextTable::Extend(script_contexts, context);
native_context()->set_script_context_table(*new_script_contexts);
}
void Genesis::HookUpGlobalThisBinding(Handle<FixedArray> outdated_contexts) {
// One of these contexts should be the one that declares the global "this"
// binding.
for (int i = 0; i < outdated_contexts->length(); ++i) {
Context* context = Context::cast(outdated_contexts->get(i));
if (context->IsScriptContext()) {
ScopeInfo* scope_info = context->scope_info();
int slot = scope_info->ReceiverContextSlotIndex();
if (slot >= 0) {
DCHECK_EQ(slot, Context::MIN_CONTEXT_SLOTS);
context->set(slot, native_context()->global_proxy());
}
}
}
}
Handle<JSGlobalObject> Genesis::CreateNewGlobals(
v8::Local<v8::ObjectTemplate> global_proxy_template,
Handle<JSGlobalProxy> global_proxy) {
// The argument global_proxy_template aka data is an ObjectTemplateInfo.
// It has a constructor pointer that points at global_constructor which is a
// FunctionTemplateInfo.
// The global_proxy_constructor is used to (re)initialize the
// global_proxy. The global_proxy_constructor also has a prototype_template
// pointer that points at js_global_object_template which is an
// ObjectTemplateInfo.
// That in turn has a constructor pointer that points at
// js_global_object_constructor which is a FunctionTemplateInfo.
// js_global_object_constructor is used to make js_global_object_function
// js_global_object_function is used to make the new global_object.
//
// --- G l o b a l ---
// Step 1: Create a fresh JSGlobalObject.
Handle<JSFunction> js_global_object_function;
Handle<ObjectTemplateInfo> js_global_object_template;
if (!global_proxy_template.IsEmpty()) {
// Get prototype template of the global_proxy_template.
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_proxy_template);
Handle<FunctionTemplateInfo> global_constructor =
Handle<FunctionTemplateInfo>(
FunctionTemplateInfo::cast(data->constructor()));
Handle<Object> proto_template(global_constructor->prototype_template(),
isolate());
if (!proto_template->IsUndefined()) {
js_global_object_template =
Handle<ObjectTemplateInfo>::cast(proto_template);
}
}
if (js_global_object_template.is_null()) {
Handle<String> name = Handle<String>(heap()->empty_string());
Handle<Code> code = Handle<Code>(isolate()->builtins()->builtin(
Builtins::kIllegal));
Handle<JSObject> prototype =
factory()->NewFunctionPrototype(isolate()->object_function());
js_global_object_function = factory()->NewFunction(
name, code, prototype, JS_GLOBAL_OBJECT_TYPE, JSGlobalObject::kSize);
#ifdef DEBUG
LookupIterator it(prototype, factory()->constructor_string(),
LookupIterator::OWN_SKIP_INTERCEPTOR);
Handle<Object> value = JSReceiver::GetProperty(&it).ToHandleChecked();
DCHECK(it.IsFound());
DCHECK_EQ(*isolate()->object_function(), *value);
#endif
} else {
Handle<FunctionTemplateInfo> js_global_object_constructor(
FunctionTemplateInfo::cast(js_global_object_template->constructor()));
js_global_object_function = ApiNatives::CreateApiFunction(
isolate(), js_global_object_constructor, factory()->the_hole_value(),
ApiNatives::GlobalObjectType);
}
js_global_object_function->initial_map()->set_is_prototype_map(true);
js_global_object_function->initial_map()->set_is_hidden_prototype();
js_global_object_function->initial_map()->set_dictionary_map(true);
Handle<JSGlobalObject> global_object =
factory()->NewJSGlobalObject(js_global_object_function);
// Step 2: (re)initialize the global proxy object.
Handle<JSFunction> global_proxy_function;
if (global_proxy_template.IsEmpty()) {
Handle<String> name = Handle<String>(heap()->empty_string());
Handle<Code> code = Handle<Code>(isolate()->builtins()->builtin(
Builtins::kIllegal));
global_proxy_function = factory()->NewFunction(
name, code, JS_GLOBAL_PROXY_TYPE, JSGlobalProxy::kSize);
} else {
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_proxy_template);
Handle<FunctionTemplateInfo> global_constructor(
FunctionTemplateInfo::cast(data->constructor()));
global_proxy_function = ApiNatives::CreateApiFunction(
isolate(), global_constructor, factory()->the_hole_value(),
ApiNatives::GlobalProxyType);
}
Handle<String> global_name = factory()->global_string();
global_proxy_function->shared()->set_instance_class_name(*global_name);
global_proxy_function->initial_map()->set_is_access_check_needed(true);
// Set global_proxy.__proto__ to js_global after ConfigureGlobalObjects
// Return the global proxy.
factory()->ReinitializeJSGlobalProxy(global_proxy, global_proxy_function);
return global_object;
}
void Genesis::HookUpGlobalProxy(Handle<JSGlobalObject> global_object,
Handle<JSGlobalProxy> global_proxy) {
// Set the native context for the global object.
global_object->set_native_context(*native_context());
global_object->set_global_proxy(*global_proxy);
global_proxy->set_native_context(*native_context());
// If we deserialized the context, the global proxy is already
// correctly set up. Otherwise it's undefined.
DCHECK(native_context()->get(Context::GLOBAL_PROXY_INDEX)->IsUndefined() ||
native_context()->global_proxy() == *global_proxy);
native_context()->set_global_proxy(*global_proxy);
}
void Genesis::HookUpGlobalObject(Handle<JSGlobalObject> global_object,
Handle<FixedArray> outdated_contexts) {
Handle<JSGlobalObject> global_object_from_snapshot(
JSGlobalObject::cast(native_context()->extension()));
native_context()->set_extension(*global_object);
native_context()->set_security_token(*global_object);
// Replace outdated global objects in deserialized contexts.
for (int i = 0; i < outdated_contexts->length(); ++i) {
Context* context = Context::cast(outdated_contexts->get(i));
// Assert that there is only one native context.
DCHECK(!context->IsNativeContext() || context == *native_context());
DCHECK_EQ(context->global_object(), *global_object_from_snapshot);
context->set_global_object(*global_object);
}
TransferNamedProperties(global_object_from_snapshot, global_object);
TransferIndexedProperties(global_object_from_snapshot, global_object);
}
// This is only called if we are not using snapshots. The equivalent
// work in the snapshot case is done in HookUpGlobalObject.
void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
Handle<JSFunction> empty_function,
ContextType context_type) {
// --- N a t i v e C o n t e x t ---
// Use the empty function as closure (no scope info).
native_context()->set_closure(*empty_function);
native_context()->set_previous(NULL);
// Set extension and global object.
native_context()->set_extension(*global_object);
native_context()->set_global_object(*global_object);
// Security setup: Set the security token of the native context to the global
// object. This makes the security check between two different contexts fail
// by default even in case of global object reinitialization.
native_context()->set_security_token(*global_object);
Isolate* isolate = global_object->GetIsolate();
Factory* factory = isolate->factory();
Handle<ScriptContextTable> script_context_table =
factory->NewScriptContextTable();
native_context()->set_script_context_table(*script_context_table);
InstallGlobalThisBinding();
Handle<String> object_name = factory->Object_string();
JSObject::AddProperty(
global_object, object_name, isolate->object_function(), DONT_ENUM);
Handle<JSObject> global(native_context()->global_object());
// Install global Function object
Handle<JSFunction> function_function =
InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
empty_function, Builtins::kIllegal);
function_function->initial_map()->set_is_callable();
function_function->initial_map()->set_is_constructor(true);
{ // --- A r r a y ---
Handle<JSFunction> array_function =
InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
isolate->initial_object_prototype(),
Builtins::kArrayCode);
array_function->shared()->DontAdaptArguments();
array_function->shared()->set_function_data(Smi::FromInt(kArrayCode));
// This seems a bit hackish, but we need to make sure Array.length
// is 1.
array_function->shared()->set_length(1);
Handle<Map> initial_map(array_function->initial_map());
// This assert protects an optimization in
// HGraphBuilder::JSArrayBuilder::EmitMapCode()
DCHECK(initial_map->elements_kind() == GetInitialFastElementsKind());
Map::EnsureDescriptorSlack(initial_map, 1);
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
Handle<AccessorInfo> array_length =
Accessors::ArrayLengthInfo(isolate, attribs);
{ // Add length.
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(array_length->name())), array_length,
attribs);
initial_map->AppendDescriptor(&d);
}
// array_function is used internally. JS code creating array object should
// search for the 'Array' property on the global object and use that one
// as the constructor. 'Array' property on a global object can be
// overwritten by JS code.
native_context()->set_array_function(*array_function);
// Cache the array maps, needed by ArrayConstructorStub
CacheInitialJSArrayMaps(native_context(), initial_map);
ArrayConstructorStub array_constructor_stub(isolate);
Handle<Code> code = array_constructor_stub.GetCode();
array_function->shared()->set_construct_stub(*code);
Handle<Map> initial_strong_map =
Map::Copy(initial_map, "SetInstancePrototype");
initial_strong_map->set_is_strong();
CacheInitialJSArrayMaps(native_context(), initial_strong_map);
}
{ // --- N u m b e r ---
Handle<JSFunction> number_fun =
InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_number_function(*number_fun);
}
{ // --- B o o l e a n ---
Handle<JSFunction> boolean_fun =
InstallFunction(global, "Boolean", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_boolean_function(*boolean_fun);
}
{ // --- S t r i n g ---
Handle<JSFunction> string_fun = InstallFunction(
global, "String", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(), Builtins::kStringConstructor);
string_fun->shared()->set_construct_stub(isolate->builtins()->builtin(
Builtins::kStringConstructor_ConstructStub));
string_fun->shared()->DontAdaptArguments();
string_fun->shared()->set_length(1);
native_context()->set_string_function(*string_fun);
Handle<Map> string_map =
Handle<Map>(native_context()->string_function()->initial_map());
Map::EnsureDescriptorSlack(string_map, 1);
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<AccessorInfo> string_length(
Accessors::StringLengthInfo(isolate, attribs));
{ // Add length.
AccessorConstantDescriptor d(factory->length_string(), string_length,
attribs);
string_map->AppendDescriptor(&d);
}
}
{
// --- S y m b o l ---
Handle<JSFunction> symbol_fun = InstallFunction(
global, "Symbol", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(), Builtins::kSymbolConstructor);
symbol_fun->shared()->set_construct_stub(isolate->builtins()->builtin(
Builtins::kSymbolConstructor_ConstructStub));
symbol_fun->shared()->set_internal_formal_parameter_count(1);
symbol_fun->shared()->set_length(1);
native_context()->set_symbol_function(*symbol_fun);
}
{ // --- D a t e ---
// Builtin functions for Date.prototype.
InstallFunction(global, "Date", JS_DATE_TYPE, JSDate::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
}
{ // -- R e g E x p
// Builtin functions for RegExp.prototype.
Handle<JSFunction> regexp_fun =
InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_regexp_function(*regexp_fun);
DCHECK(regexp_fun->has_initial_map());
Handle<Map> initial_map(regexp_fun->initial_map());
DCHECK_EQ(0, initial_map->GetInObjectProperties());
Map::EnsureDescriptorSlack(initial_map, 1);
// ECMA-262, section 15.10.7.5.
PropertyAttributes writable =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
DataDescriptor field(factory->last_index_string(),
JSRegExp::kLastIndexFieldIndex, writable,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
static const int num_fields = JSRegExp::kInObjectFieldCount;
initial_map->SetInObjectProperties(num_fields);
initial_map->set_unused_property_fields(0);
initial_map->set_instance_size(initial_map->instance_size() +
num_fields * kPointerSize);
}
// Initialize the embedder data slot.
Handle<FixedArray> embedder_data = factory->NewFixedArray(3);
native_context()->set_embedder_data(*embedder_data);
if (context_type == THIN_CONTEXT) return;
{ // -- J S O N
Handle<String> name = factory->InternalizeUtf8String("JSON");
Handle<JSFunction> cons = factory->NewFunction(name);
JSFunction::SetInstancePrototype(cons,
Handle<Object>(native_context()->initial_object_prototype(), isolate));
cons->shared()->set_instance_class_name(*name);
Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
DCHECK(json_object->IsJSObject());
JSObject::AddProperty(global, name, json_object, DONT_ENUM);
}
{ // -- M a t h
Handle<String> name = factory->InternalizeUtf8String("Math");
Handle<JSFunction> cons = factory->NewFunction(name);
JSFunction::SetInstancePrototype(
cons,
Handle<Object>(native_context()->initial_object_prototype(), isolate));
cons->shared()->set_instance_class_name(*name);
Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
DCHECK(json_object->IsJSObject());
JSObject::AddProperty(global, name, json_object, DONT_ENUM);
}
{ // -- A r r a y B u f f e r
Handle<JSFunction> array_buffer_fun =
InstallFunction(
global, "ArrayBuffer", JS_ARRAY_BUFFER_TYPE,
JSArrayBuffer::kSizeWithInternalFields,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_array_buffer_fun(*array_buffer_fun);
}
{ // -- T y p e d A r r a y s
#define INSTALL_TYPED_ARRAY(Type, type, TYPE, ctype, size) \
{ \
Handle<JSFunction> fun; \
InstallTypedArray(#Type "Array", TYPE##_ELEMENTS, &fun); \
native_context()->set_##type##_array_fun(*fun); \
}
TYPED_ARRAYS(INSTALL_TYPED_ARRAY)
#undef INSTALL_TYPED_ARRAY
Handle<JSFunction> data_view_fun =
InstallFunction(
global, "DataView", JS_DATA_VIEW_TYPE,
JSDataView::kSizeWithInternalFields,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_data_view_fun(*data_view_fun);
}
{ // -- M a p
Handle<JSFunction> js_map_fun = InstallFunction(
global, "Map", JS_MAP_TYPE, JSMap::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
native_context()->set_js_map_fun(*js_map_fun);
}
{ // -- S e t
Handle<JSFunction> js_set_fun = InstallFunction(
global, "Set", JS_SET_TYPE, JSSet::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
native_context()->set_js_set_fun(*js_set_fun);
}
{ // -- I t e r a t o r R e s u l t
Handle<Map> map =
factory->NewMap(JS_ITERATOR_RESULT_TYPE, JSIteratorResult::kSize);
Map::SetPrototype(map, isolate->initial_object_prototype());
Map::EnsureDescriptorSlack(map, 2);
{ // value
DataDescriptor d(factory->value_string(), JSIteratorResult::kValueIndex,
NONE, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // done
DataDescriptor d(factory->done_string(), JSIteratorResult::kDoneIndex,
NONE, Representation::Tagged());
map->AppendDescriptor(&d);
}
map->SetInObjectProperties(2);
native_context()->set_iterator_result_map(*map);
}
// -- W e a k M a p
InstallFunction(global, "WeakMap", JS_WEAK_MAP_TYPE, JSWeakMap::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
// -- W e a k S e t
InstallFunction(global, "WeakSet", JS_WEAK_SET_TYPE, JSWeakSet::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
{ // --- sloppy arguments map
// Make sure we can recognize argument objects at runtime.
// This is done by introducing an anonymous function with
// class_name equals 'Arguments'.
Handle<String> arguments_string = factory->Arguments_string();
Handle<Code> code(isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> function = factory->NewFunctionWithoutPrototype(
arguments_string, code);
function->shared()->set_instance_class_name(*arguments_string);
Handle<Map> map = factory->NewMap(
JS_OBJECT_TYPE, Heap::kSloppyArgumentsObjectSize, FAST_ELEMENTS);
// Create the descriptor array for the arguments object.
Map::EnsureDescriptorSlack(map, 2);
{ // length
DataDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // callee
DataDescriptor d(factory->callee_string(), Heap::kArgumentsCalleeIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
// @@iterator method is added later.
map->SetInObjectProperties(2);
native_context()->set_sloppy_arguments_map(*map);
DCHECK(!function->has_initial_map());
JSFunction::SetInitialMap(function, map,
isolate->initial_object_prototype());
DCHECK(map->GetInObjectProperties() > Heap::kArgumentsCalleeIndex);
DCHECK(map->GetInObjectProperties() > Heap::kArgumentsLengthIndex);
DCHECK(!map->is_dictionary_map());
DCHECK(IsFastObjectElementsKind(map->elements_kind()));
}
{ // --- fast and slow aliased arguments map
Handle<Map> map = isolate->sloppy_arguments_map();
map = Map::Copy(map, "FastAliasedArguments");
map->set_elements_kind(FAST_SLOPPY_ARGUMENTS_ELEMENTS);
DCHECK_EQ(2, map->GetInObjectProperties());
native_context()->set_fast_aliased_arguments_map(*map);
map = Map::Copy(map, "SlowAliasedArguments");
map->set_elements_kind(SLOW_SLOPPY_ARGUMENTS_ELEMENTS);
DCHECK_EQ(2, map->GetInObjectProperties());
native_context()->set_slow_aliased_arguments_map(*map);
}
{ // --- strict mode arguments map
const PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
// Create the ThrowTypeError functions.
Handle<AccessorPair> callee = factory->NewAccessorPair();
Handle<AccessorPair> caller = factory->NewAccessorPair();
Handle<JSFunction> poison = GetStrictArgumentsPoisonFunction();
// Install the ThrowTypeError functions.
callee->set_getter(*poison);
callee->set_setter(*poison);
caller->set_getter(*poison);
caller->set_setter(*poison);
// Create the map. Allocate one in-object field for length.
Handle<Map> map = factory->NewMap(
JS_OBJECT_TYPE, Heap::kStrictArgumentsObjectSize, FAST_ELEMENTS);
// Create the descriptor array for the arguments object.
Map::EnsureDescriptorSlack(map, 3);
{ // length
DataDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // callee
AccessorConstantDescriptor d(factory->callee_string(), callee,
attributes);
map->AppendDescriptor(&d);
}
{ // caller
AccessorConstantDescriptor d(factory->caller_string(), caller,
attributes);
map->AppendDescriptor(&d);
}
// @@iterator method is added later.
DCHECK_EQ(native_context()->object_function()->prototype(),
*isolate->initial_object_prototype());
Map::SetPrototype(map, isolate->initial_object_prototype());
map->SetInObjectProperties(1);
// Copy constructor from the sloppy arguments boilerplate.
map->SetConstructor(
native_context()->sloppy_arguments_map()->GetConstructor());
native_context()->set_strict_arguments_map(*map);
DCHECK(map->GetInObjectProperties() > Heap::kArgumentsLengthIndex);
DCHECK(!map->is_dictionary_map());
DCHECK(IsFastObjectElementsKind(map->elements_kind()));
}
{ // --- context extension
// Create a function for the context extension objects.
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> context_extension_fun = factory->NewFunction(
factory->empty_string(), code, JS_CONTEXT_EXTENSION_OBJECT_TYPE,
JSObject::kHeaderSize);
Handle<String> name = factory->InternalizeOneByteString(
STATIC_CHAR_VECTOR("context_extension"));
context_extension_fun->shared()->set_instance_class_name(*name);
native_context()->set_context_extension_function(*context_extension_fun);
}
{
// Set up the call-as-function delegate.
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kHandleApiCallAsFunction));
Handle<JSFunction> delegate = factory->NewFunction(
factory->empty_string(), code, JS_OBJECT_TYPE, JSObject::kHeaderSize);
native_context()->set_call_as_function_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
{
// Set up the call-as-constructor delegate.
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kHandleApiCallAsConstructor));
Handle<JSFunction> delegate = factory->NewFunction(
factory->empty_string(), code, JS_OBJECT_TYPE, JSObject::kHeaderSize);
native_context()->set_call_as_constructor_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
}
void Genesis::InstallTypedArray(const char* name, ElementsKind elements_kind,
Handle<JSFunction>* fun) {
Handle<JSObject> global = Handle<JSObject>(native_context()->global_object());
Handle<JSFunction> result = InstallFunction(
global, name, JS_TYPED_ARRAY_TYPE, JSTypedArray::kSize,
isolate()->initial_object_prototype(), Builtins::kIllegal);
Handle<Map> initial_map = isolate()->factory()->NewMap(
JS_TYPED_ARRAY_TYPE,
JSTypedArray::kSizeWithInternalFields,
elements_kind);
JSFunction::SetInitialMap(result, initial_map,
handle(initial_map->prototype(), isolate()));
*fun = result;
}
void Genesis::InitializeExperimentalGlobal() {
#define FEATURE_INITIALIZE_GLOBAL(id, descr) InitializeGlobal_##id();
HARMONY_INPROGRESS(FEATURE_INITIALIZE_GLOBAL)
HARMONY_STAGED(FEATURE_INITIALIZE_GLOBAL)
HARMONY_SHIPPING(FEATURE_INITIALIZE_GLOBAL)
#undef FEATURE_INITIALIZE_GLOBAL
}
bool Bootstrapper::CompileBuiltin(Isolate* isolate, int index) {
Vector<const char> name = Natives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->SourceLookup<Natives>(index);
// We pass in extras_utils so that builtin code can set it up for later use
// by actual extras code, compiled with CompileExtraBuiltin.
Handle<Object> global = isolate->global_object();
Handle<Object> utils = isolate->natives_utils_object();
Handle<Object> extras_utils = isolate->extras_utils_object();
Handle<Object> args[] = {global, utils, extras_utils};
return Bootstrapper::CompileNative(isolate, name, source_code,
arraysize(args), args);
}
bool Bootstrapper::CompileExperimentalBuiltin(Isolate* isolate, int index) {
HandleScope scope(isolate);
Vector<const char> name = ExperimentalNatives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->SourceLookup<ExperimentalNatives>(index);
Handle<Object> global = isolate->global_object();
Handle<Object> utils = isolate->natives_utils_object();
Handle<Object> args[] = {global, utils};
return Bootstrapper::CompileNative(isolate, name, source_code,
arraysize(args), args);
}
bool Bootstrapper::CompileExtraBuiltin(Isolate* isolate, int index) {
HandleScope scope(isolate);
Vector<const char> name = ExtraNatives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->SourceLookup<ExtraNatives>(index);
Handle<Object> global = isolate->global_object();
Handle<Object> binding = isolate->extras_binding_object();
Handle<Object> extras_utils = isolate->extras_utils_object();
Handle<Object> args[] = {global, binding, extras_utils};
return Bootstrapper::CompileNative(isolate, name, source_code,
arraysize(args), args);
}
bool Bootstrapper::CompileExperimentalExtraBuiltin(Isolate* isolate,
int index) {
HandleScope scope(isolate);
Vector<const char> name = ExperimentalExtraNatives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->SourceLookup<ExperimentalExtraNatives>(index);
Handle<Object> global = isolate->global_object();
Handle<Object> binding = isolate->extras_binding_object();
Handle<Object> extras_utils = isolate->extras_utils_object();
Handle<Object> args[] = {global, binding, extras_utils};
return Bootstrapper::CompileNative(isolate, name, source_code,
arraysize(args), args);
}
bool Bootstrapper::CompileCodeStubBuiltin(Isolate* isolate, int index) {
HandleScope scope(isolate);
Vector<const char> name = CodeStubNatives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->SourceLookup<CodeStubNatives>(index);
Handle<JSObject> global(isolate->global_object());
Handle<JSObject> exports(isolate->heap()->code_stub_exports_object());
Handle<Object> args[] = {global, exports};
bool result =
CompileNative(isolate, name, source_code, arraysize(args), args);
return result;
}
bool Bootstrapper::CompileNative(Isolate* isolate, Vector<const char> name,
Handle<String> source, int argc,
Handle<Object> argv[]) {
SuppressDebug compiling_natives(isolate->debug());
// During genesis, the boilerplate for stack overflow won't work until the
// environment has been at least partially initialized. Add a stack check
// before entering JS code to catch overflow early.
StackLimitCheck check(isolate);
if (check.JsHasOverflowed(1 * KB)) {
isolate->StackOverflow();
return false;
}
Handle<Context> context(isolate->context());
Handle<String> script_name =
isolate->factory()->NewStringFromUtf8(name).ToHandleChecked();
Handle<SharedFunctionInfo> function_info = Compiler::CompileScript(
source, script_name, 0, 0, ScriptOriginOptions(), Handle<Object>(),
context, NULL, NULL, ScriptCompiler::kNoCompileOptions, NATIVES_CODE,
false);
if (function_info.is_null()) return false;
DCHECK(context->IsNativeContext());
Handle<Context> runtime_context(context->runtime_context());
Handle<JSFunction> fun =
isolate->factory()->NewFunctionFromSharedFunctionInfo(function_info,
runtime_context);
Handle<Object> receiver = isolate->factory()->undefined_value();
// For non-extension scripts, run script to get the function wrapper.
Handle<Object> wrapper;
if (!Execution::Call(isolate, fun, receiver, 0, NULL).ToHandle(&wrapper)) {
return false;
}
// Then run the function wrapper.
return !Execution::Call(isolate, Handle<JSFunction>::cast(wrapper), receiver,
argc, argv).is_null();
}
bool Genesis::CallUtilsFunction(Isolate* isolate, const char* name) {
Handle<JSObject> utils =
Handle<JSObject>::cast(isolate->natives_utils_object());
Handle<String> name_string =
isolate->factory()->NewStringFromAsciiChecked(name);
Handle<Object> fun = JSObject::GetDataProperty(utils, name_string);
Handle<Object> receiver = isolate->factory()->undefined_value();
Handle<Object> args[] = {utils};
return !Execution::Call(isolate, fun, receiver, 1, args).is_null();
}
bool Genesis::CompileExtension(Isolate* isolate, v8::Extension* extension) {
Factory* factory = isolate->factory();
HandleScope scope(isolate);
Handle<SharedFunctionInfo> function_info;
Handle<String> source =
isolate->factory()
->NewExternalStringFromOneByte(extension->source())
.ToHandleChecked();
DCHECK(source->IsOneByteRepresentation());
// If we can't find the function in the cache, we compile a new
// function and insert it into the cache.
Vector<const char> name = CStrVector(extension->name());
SourceCodeCache* cache = isolate->bootstrapper()->extensions_cache();
Handle<Context> context(isolate->context());
DCHECK(context->IsNativeContext());
if (!cache->Lookup(name, &function_info)) {
Handle<String> script_name =
factory->NewStringFromUtf8(name).ToHandleChecked();
function_info = Compiler::CompileScript(
source, script_name, 0, 0, ScriptOriginOptions(), Handle<Object>(),
context, extension, NULL, ScriptCompiler::kNoCompileOptions,
NOT_NATIVES_CODE, false);
if (function_info.is_null()) return false;
cache->Add(name, function_info);
}
// Set up the function context. Conceptually, we should clone the
// function before overwriting the context but since we're in a
// single-threaded environment it is not strictly necessary.
Handle<JSFunction> fun =
factory->NewFunctionFromSharedFunctionInfo(function_info, context);
// Call function using either the runtime object or the global
// object as the receiver. Provide no parameters.
Handle<Object> receiver = isolate->global_object();
return !Execution::Call(isolate, fun, receiver, 0, NULL).is_null();
}
static Handle<JSObject> ResolveBuiltinIdHolder(Handle<Context> native_context,
const char* holder_expr) {
Isolate* isolate = native_context->GetIsolate();
Factory* factory = isolate->factory();
Handle<JSGlobalObject> global(native_context->global_object());
const char* period_pos = strchr(holder_expr, '.');
if (period_pos == NULL) {
return Handle<JSObject>::cast(
Object::GetPropertyOrElement(
global, factory->InternalizeUtf8String(holder_expr))
.ToHandleChecked());
}
const char* inner = period_pos + 1;
DCHECK(!strchr(inner, '.'));
Vector<const char> property(holder_expr,
static_cast<int>(period_pos - holder_expr));
Handle<String> property_string = factory->InternalizeUtf8String(property);
DCHECK(!property_string.is_null());
Handle<JSObject> object = Handle<JSObject>::cast(
Object::GetProperty(global, property_string).ToHandleChecked());
if (strcmp("prototype", inner) == 0) {
Handle<JSFunction> function = Handle<JSFunction>::cast(object);
return Handle<JSObject>(JSObject::cast(function->prototype()));
}
Handle<String> inner_string = factory->InternalizeUtf8String(inner);
DCHECK(!inner_string.is_null());
Handle<Object> value =
Object::GetProperty(object, inner_string).ToHandleChecked();
return Handle<JSObject>::cast(value);
}
template <typename Data>
Handle<JSTypedArray> CreateTypedArray(Isolate* isolate, ExternalArrayType type,
size_t num_elements, Data** data) {
size_t byte_length = num_elements * sizeof(**data);
Handle<JSArrayBuffer> buffer =
isolate->factory()->NewJSArrayBuffer(SharedFlag::kNotShared, TENURED);
bool is_external = (*data != nullptr);
if (!is_external) {
*data = reinterpret_cast<Data*>(
isolate->array_buffer_allocator()->Allocate(byte_length));
}
JSArrayBuffer::Setup(buffer, isolate, is_external, *data, byte_length,
SharedFlag::kNotShared);
return isolate->factory()->NewJSTypedArray(type, buffer, 0, num_elements,
TENURED);
}
void Genesis::ConfigureUtilsObject(ContextType context_type) {
switch (context_type) {
// We still need the utils object to find debug functions.
case DEBUG_CONTEXT:
return;
// Expose the natives in global if a valid name for it is specified.
case FULL_CONTEXT: {
// We still need the utils object after deserialization.
if (isolate()->serializer_enabled()) return;
if (FLAG_expose_natives_as == NULL) break;
if (strlen(FLAG_expose_natives_as) == 0) break;
HandleScope scope(isolate());
Handle<String> natives_key =
factory()->InternalizeUtf8String(FLAG_expose_natives_as);
uint32_t dummy_index;
if (natives_key->AsArrayIndex(&dummy_index)) break;
Handle<Object> utils = isolate()->natives_utils_object();
Handle<JSObject> global = isolate()->global_object();
JSObject::AddProperty(global, natives_key, utils, DONT_ENUM);
break;
}
case THIN_CONTEXT:
break;
}
// The utils object can be removed for cases that reach this point.
native_context()->set_natives_utils_object(heap()->undefined_value());
#ifdef DEBUG
JSGlobalObject* dummy = native_context()->runtime_context()->global_object();
DCHECK_EQ(0, dummy->elements()->length());
DCHECK_EQ(0, GlobalDictionary::cast(dummy->properties())->NumberOfElements());
#endif
}
void Bootstrapper::ExportFromRuntime(Isolate* isolate,
Handle<JSObject> container) {
Factory* factory = isolate->factory();
HandleScope scope(isolate);
Handle<Context> native_context = isolate->native_context();
#define EXPORT_PRIVATE_SYMBOL(NAME) \
Handle<String> NAME##_name = factory->NewStringFromAsciiChecked(#NAME); \
JSObject::AddProperty(container, NAME##_name, factory->NAME(), NONE);
PRIVATE_SYMBOL_LIST(EXPORT_PRIVATE_SYMBOL)
#undef EXPORT_PRIVATE_SYMBOL
#define EXPORT_PUBLIC_SYMBOL(NAME, DESCRIPTION) \
Handle<String> NAME##_name = factory->NewStringFromAsciiChecked(#NAME); \
JSObject::AddProperty(container, NAME##_name, factory->NAME(), NONE);
PUBLIC_SYMBOL_LIST(EXPORT_PUBLIC_SYMBOL)
WELL_KNOWN_SYMBOL_LIST(EXPORT_PUBLIC_SYMBOL)
#undef EXPORT_PUBLIC_SYMBOL
{
Handle<JSFunction> apply = InstallFunction(
container, "reflect_apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kReflectApply);
apply->shared()->set_internal_formal_parameter_count(3);
apply->shared()->set_length(3);
Handle<TypeFeedbackVector> feedback_vector =
TypeFeedbackVector::CreatePushAppliedArgumentsVector(isolate);
apply->shared()->set_feedback_vector(*feedback_vector);
native_context->set_reflect_apply(*apply);
}
{
Handle<JSFunction> construct = InstallFunction(
container, "reflect_construct", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kReflectConstruct);
construct->shared()->set_internal_formal_parameter_count(3);
construct->shared()->set_length(2);
Handle<TypeFeedbackVector> feedback_vector =
TypeFeedbackVector::CreatePushAppliedArgumentsVector(isolate);
construct->shared()->set_feedback_vector(*feedback_vector);
native_context->set_reflect_construct(*construct);
}
Handle<JSObject> iterator_prototype;
{
PrototypeIterator iter(native_context->generator_object_prototype_map());
iter.Advance(); // Advance to the prototype of generator_object_prototype.
iterator_prototype = Handle<JSObject>(iter.GetCurrent<JSObject>());
JSObject::AddProperty(container,
factory->InternalizeUtf8String("IteratorPrototype"),
iterator_prototype, NONE);
}
{
PrototypeIterator iter(native_context->sloppy_generator_function_map());
Handle<JSObject> generator_function_prototype(iter.GetCurrent<JSObject>());
JSObject::AddProperty(
container, factory->InternalizeUtf8String("GeneratorFunctionPrototype"),
generator_function_prototype, NONE);
static const bool kUseStrictFunctionMap = true;
Handle<JSFunction> generator_function_function =
InstallFunction(container, "GeneratorFunction", JS_FUNCTION_TYPE,
JSFunction::kSize, generator_function_prototype,
Builtins::kIllegal, kUseStrictFunctionMap);
generator_function_function->initial_map()->set_is_callable();
generator_function_function->initial_map()->set_is_constructor(true);
}
{ // -- S e t I t e r a t o r
Handle<JSObject> set_iterator_prototype =
isolate->factory()->NewJSObject(isolate->object_function(), TENURED);
SetObjectPrototype(set_iterator_prototype, iterator_prototype);
Handle<JSFunction> set_iterator_function = InstallFunction(
container, "SetIterator", JS_SET_ITERATOR_TYPE, JSSetIterator::kSize,
set_iterator_prototype, Builtins::kIllegal);
native_context->set_set_iterator_map(set_iterator_function->initial_map());
}
{ // -- M a p I t e r a t o r
Handle<JSObject> map_iterator_prototype =
isolate->factory()->NewJSObject(isolate->object_function(), TENURED);
SetObjectPrototype(map_iterator_prototype, iterator_prototype);
Handle<JSFunction> map_iterator_function = InstallFunction(
container, "MapIterator", JS_MAP_ITERATOR_TYPE, JSMapIterator::kSize,
map_iterator_prototype, Builtins::kIllegal);
native_context->set_map_iterator_map(map_iterator_function->initial_map());
}
{ // -- S c r i p t
// Builtin functions for Script.
Handle<JSFunction> script_fun = InstallFunction(
container, "Script", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
Handle<JSObject> prototype =
factory->NewJSObject(isolate->object_function(), TENURED);
Accessors::FunctionSetPrototype(script_fun, prototype).Assert();
native_context->set_script_function(*script_fun);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
Map::EnsureDescriptorSlack(script_map, 15);
PropertyAttributes attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<AccessorInfo> script_column =
Accessors::ScriptColumnOffsetInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_column->name())), script_column,
attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_id = Accessors::ScriptIdInfo(isolate, attribs);
{
AccessorConstantDescriptor d(Handle<Name>(Name::cast(script_id->name())),
script_id, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_name =
Accessors::ScriptNameInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_name->name())), script_name, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_line =
Accessors::ScriptLineOffsetInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_line->name())), script_line, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_source =
Accessors::ScriptSourceInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_source->name())), script_source,
attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_type =
Accessors::ScriptTypeInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_type->name())), script_type, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_compilation_type =
Accessors::ScriptCompilationTypeInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_compilation_type->name())),
script_compilation_type, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_line_ends =
Accessors::ScriptLineEndsInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_line_ends->name())), script_line_ends,
attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_context_data =
Accessors::ScriptContextDataInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_context_data->name())),
script_context_data, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_eval_from_script =
Accessors::ScriptEvalFromScriptInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_eval_from_script->name())),
script_eval_from_script, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_eval_from_script_position =
Accessors::ScriptEvalFromScriptPositionInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_eval_from_script_position->name())),
script_eval_from_script_position, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_eval_from_function_name =
Accessors::ScriptEvalFromFunctionNameInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_eval_from_function_name->name())),
script_eval_from_function_name, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_source_url =
Accessors::ScriptSourceUrlInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_source_url->name())),
script_source_url, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_source_mapping_url =
Accessors::ScriptSourceMappingUrlInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_source_mapping_url->name())),
script_source_mapping_url, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_is_embedder_debug_script =
Accessors::ScriptIsEmbedderDebugScriptInfo(isolate, attribs);
{
AccessorConstantDescriptor d(
Handle<Name>(Name::cast(script_is_embedder_debug_script->name())),
script_is_embedder_debug_script, attribs);
script_map->AppendDescriptor(&d);
}
}
}
void Bootstrapper::ExportExperimentalFromRuntime(Isolate* isolate,
Handle<JSObject> container) {
HandleScope scope(isolate);
#define INITIALIZE_FLAG(FLAG) \
{ \
Handle<String> name = \
isolate->factory()->NewStringFromAsciiChecked(#FLAG); \
JSObject::AddProperty(container, name, \
isolate->factory()->ToBoolean(FLAG), NONE); \
}
INITIALIZE_FLAG(FLAG_harmony_tostring)
INITIALIZE_FLAG(FLAG_harmony_tolength)
#undef INITIALIZE_FLAG
}
#define EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(id) \
void Genesis::InitializeGlobal_##id() {}
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_modules)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_array_includes)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_proxies)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_sloppy)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_sloppy_function)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_sloppy_let)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_rest_parameters)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_default_parameters)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_destructuring)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_object_observe)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_regexps)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_unicode_regexps)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_completion)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_tolength)
EMPTY_INITIALIZE_GLOBAL_FOR_FEATURE(harmony_do_expressions)
static void SimpleInstallFunction(Handle<JSObject>& base, const char* name,
Builtins::Name call, int len, bool adapt) {
Handle<JSFunction> fun =
InstallFunction(base, name, JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), call);
if (adapt) {
fun->shared()->set_internal_formal_parameter_count(len);
} else {
fun->shared()->DontAdaptArguments();
}
fun->shared()->set_length(len);
}
void InstallPublicSymbol(Factory* factory, Handle<Context> native_context,
const char* name, Handle<Symbol> value) {
Handle<JSGlobalObject> global(
JSGlobalObject::cast(native_context->global_object()));
Handle<String> symbol_string = factory->InternalizeUtf8String("Symbol");
Handle<JSObject> symbol = Handle<JSObject>::cast(
JSObject::GetProperty(global, symbol_string).ToHandleChecked());
Handle<String> name_string = factory->InternalizeUtf8String(name);
PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
JSObject::AddProperty(symbol, name_string, value, attributes);
}
void Genesis::InitializeGlobal_harmony_tostring() {
if (!FLAG_harmony_tostring) return;
InstallPublicSymbol(factory(), native_context(), "toStringTag",
factory()->to_string_tag_symbol());
}
void Genesis::InitializeGlobal_harmony_concat_spreadable() {
if (!FLAG_harmony_concat_spreadable) return;
InstallPublicSymbol(factory(), native_context(), "isConcatSpreadable",
factory()->is_concat_spreadable_symbol());
}
void Genesis::InitializeGlobal_harmony_regexp_subclass() {
if (!FLAG_harmony_regexp_subclass) return;
InstallPublicSymbol(factory(), native_context(), "match",
factory()->match_symbol());
InstallPublicSymbol(factory(), native_context(), "replace",
factory()->replace_symbol());
InstallPublicSymbol(factory(), native_context(), "search",
factory()->search_symbol());
InstallPublicSymbol(factory(), native_context(), "split",
factory()->split_symbol());
}
void Genesis::InitializeGlobal_harmony_reflect() {
if (!FLAG_harmony_reflect) return;
Handle<JSGlobalObject> global(JSGlobalObject::cast(
native_context()->global_object()));
Handle<String> reflect_string =
factory()->NewStringFromStaticChars("Reflect");
Handle<JSObject> reflect =
factory()->NewJSObject(isolate()->object_function(), TENURED);
JSObject::AddProperty(global, reflect_string, reflect, DONT_ENUM);
SimpleInstallFunction(reflect, "defineProperty",
Builtins::kReflectDefineProperty, 3, true);
SimpleInstallFunction(reflect, "deleteProperty",
Builtins::kReflectDeleteProperty, 2, true);
SimpleInstallFunction(reflect, "get",
Builtins::kReflectGet, 3, false);
SimpleInstallFunction(reflect, "getOwnPropertyDescriptor",
Builtins::kReflectGetOwnPropertyDescriptor, 2, true);
SimpleInstallFunction(reflect, "getPrototypeOf",
Builtins::kReflectGetPrototypeOf, 1, true);
SimpleInstallFunction(reflect, "has",
Builtins::kReflectHas, 2, true);
SimpleInstallFunction(reflect, "isExtensible",
Builtins::kReflectIsExtensible, 1, true);
SimpleInstallFunction(reflect, "preventExtensions",
Builtins::kReflectPreventExtensions, 1, true);
SimpleInstallFunction(reflect, "set",
Builtins::kReflectSet, 3, false);
SimpleInstallFunction(reflect, "setPrototypeOf",
Builtins::kReflectSetPrototypeOf, 2, true);
}
void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
if (!FLAG_harmony_sharedarraybuffer) return;
Handle<JSGlobalObject> global(
JSGlobalObject::cast(native_context()->global_object()));
Handle<JSFunction> shared_array_buffer_fun = InstallFunction(
global, "SharedArrayBuffer", JS_ARRAY_BUFFER_TYPE,
JSArrayBuffer::kSizeWithInternalFields,
isolate()->initial_object_prototype(), Builtins::kIllegal);
native_context()->set_shared_array_buffer_fun(*shared_array_buffer_fun);
}
void Genesis::InitializeGlobal_harmony_simd() {
if (!FLAG_harmony_simd) return;
Handle<JSGlobalObject> global(
JSGlobalObject::cast(native_context()->global_object()));
Isolate* isolate = global->GetIsolate();
Factory* factory = isolate->factory();
Handle<String> name = factory->InternalizeUtf8String("SIMD");
Handle<JSFunction> cons = factory->NewFunction(name);
JSFunction::SetInstancePrototype(
cons,
Handle<Object>(native_context()->initial_object_prototype(), isolate));
cons->shared()->set_instance_class_name(*name);
Handle<JSObject> simd_object = factory->NewJSObject(cons, TENURED);
DCHECK(simd_object->IsJSObject());
JSObject::AddProperty(global, name, simd_object, DONT_ENUM);
// Install SIMD type functions. Set the instance class names since
// InstallFunction only does this when we install on the JSGlobalObject.
#define SIMD128_INSTALL_FUNCTION(TYPE, Type, type, lane_count, lane_type) \
Handle<JSFunction> type##_function = InstallFunction( \
simd_object, #Type, JS_VALUE_TYPE, JSValue::kSize, \
isolate->initial_object_prototype(), Builtins::kIllegal); \
native_context()->set_##type##_function(*type##_function); \
type##_function->shared()->set_instance_class_name(*factory->Type##_string());
SIMD128_TYPES(SIMD128_INSTALL_FUNCTION)
#undef SIMD128_INSTALL_FUNCTION
}
Handle<JSFunction> Genesis::InstallInternalArray(Handle<JSObject> target,
const char* name,
ElementsKind elements_kind) {
// --- I n t e r n a l A r r a y ---
// An array constructor on the builtins object that works like
// the public Array constructor, except that its prototype
// doesn't inherit from Object.prototype.
// To be used only for internal work by builtins. Instances
// must not be leaked to user code.
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Handle<JSFunction> array_function =
InstallFunction(target, name, JS_ARRAY_TYPE, JSArray::kSize, prototype,
Builtins::kInternalArrayCode);
InternalArrayConstructorStub internal_array_constructor_stub(isolate());
Handle<Code> code = internal_array_constructor_stub.GetCode();
array_function->shared()->set_construct_stub(*code);
array_function->shared()->DontAdaptArguments();
Handle<Map> original_map(array_function->initial_map());
Handle<Map> initial_map = Map::Copy(original_map, "InternalArray");
initial_map->set_elements_kind(elements_kind);
JSFunction::SetInitialMap(array_function, initial_map, prototype);
// Make "length" magic on instances.
Map::EnsureDescriptorSlack(initial_map, 1);
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
Handle<AccessorInfo> array_length =
Accessors::ArrayLengthInfo(isolate(), attribs);
{ // Add length.
AccessorConstantDescriptor d(Handle<Name>(Name::cast(array_length->name())),
array_length, attribs);
initial_map->AppendDescriptor(&d);
}
return array_function;
}
bool Genesis::InstallNatives(ContextType context_type) {
HandleScope scope(isolate());
// Create a bridge function that has context in the native context.
Handle<JSFunction> bridge = factory()->NewFunction(factory()->empty_string());
DCHECK(bridge->context() == *isolate()->native_context());
// Allocate the runtime context.
{
Handle<Context> context =
factory()->NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge);
native_context()->set_runtime_context(*context);
Handle<Code> code = isolate()->builtins()->Illegal();
Handle<JSFunction> global_fun =
factory()->NewFunction(factory()->empty_string(), code,
JS_GLOBAL_OBJECT_TYPE, JSGlobalObject::kSize);
global_fun->initial_map()->set_dictionary_map(true);
global_fun->initial_map()->set_prototype(heap()->null_value());
Handle<JSGlobalObject> dummy_global =
Handle<JSGlobalObject>::cast(factory()->NewJSGlobalObject(global_fun));
dummy_global->set_native_context(*native_context());
dummy_global->set_global_proxy(native_context()->global_proxy());
context->set_global_object(*dummy_global);
// Something went wrong if we actually need to write into the dummy global.
dummy_global->set_properties(*GlobalDictionary::New(isolate(), 0));
dummy_global->set_elements(heap()->empty_fixed_array());
}
// Set up the utils object as shared container between native scripts.
Handle<JSObject> utils = factory()->NewJSObject(isolate()->object_function());
JSObject::NormalizeProperties(utils, CLEAR_INOBJECT_PROPERTIES, 16,
"utils container for native scripts");
native_context()->set_natives_utils_object(*utils);
// Set up the extras utils object as a shared container between native
// scripts and extras. (Extras consume things added there by native scripts.)
Handle<JSObject> extras_utils =
factory()->NewJSObject(isolate()->object_function());
native_context()->set_extras_utils_object(*extras_utils);
InstallInternalArray(extras_utils, "InternalPackedArray", FAST_ELEMENTS);
int builtin_index = Natives::GetDebuggerCount();
// Only run prologue.js and runtime.js at this point.
DCHECK_EQ(builtin_index, Natives::GetIndex("prologue"));
if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
DCHECK_EQ(builtin_index, Natives::GetIndex("runtime"));
if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
// A thin context is ready at this point.
if (context_type == THIN_CONTEXT) return true;
{
// Builtin function for OpaqueReference -- a JSValue-based object,
// that keeps its field isolated from JavaScript code. It may store
// objects, that JavaScript code may not access.
Handle<JSFunction> opaque_reference_fun = factory()->NewFunction(
factory()->empty_string(), isolate()->builtins()->Illegal(),
isolate()->initial_object_prototype(), JS_VALUE_TYPE, JSValue::kSize);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Accessors::FunctionSetPrototype(opaque_reference_fun, prototype).Assert();
native_context()->set_opaque_reference_function(*opaque_reference_fun);
}
// InternalArrays should not use Smi-Only array optimizations. There are too
// many places in the C++ runtime code (e.g. RegEx) that assume that
// elements in InternalArrays can be set to non-Smi values without going
// through a common bottleneck that would make the SMI_ONLY -> FAST_ELEMENT
// transition easy to trap. Moreover, they rarely are smi-only.
{
HandleScope scope(isolate());
Handle<JSObject> utils =
Handle<JSObject>::cast(isolate()->natives_utils_object());
Handle<JSFunction> array_function =
InstallInternalArray(utils, "InternalArray", FAST_HOLEY_ELEMENTS);
native_context()->set_internal_array_function(*array_function);
InstallInternalArray(utils, "InternalPackedArray", FAST_ELEMENTS);
}
// Run the rest of the native scripts.
while (builtin_index < Natives::GetBuiltinsCount()) {
if (!Bootstrapper::CompileBuiltin(isolate(), builtin_index++)) return false;
}
if (!CallUtilsFunction(isolate(), "PostNatives")) return false;
auto function_cache =
ObjectHashTable::New(isolate(), ApiNatives::kInitialFunctionCacheSize,
USE_CUSTOM_MINIMUM_CAPACITY);
native_context()->set_function_cache(*function_cache);
// Store the map for the %ObjectPrototype% after the natives has been compiled
// and the Object function has been set up.
Handle<JSFunction> object_function(native_context()->object_function());
DCHECK(JSObject::cast(object_function->initial_map()->prototype())
->HasFastProperties());
native_context()->set_object_function_prototype_map(
HeapObject::cast(object_function->initial_map()->prototype())->map());
// Store the map for the %StringPrototype% after the natives has been compiled
// and the String function has been set up.
Handle<JSFunction> string_function(native_context()->string_function());
DCHECK(JSObject::cast(
string_function->initial_map()->prototype())->HasFastProperties());
native_context()->set_string_function_prototype_map(
HeapObject::cast(string_function->initial_map()->prototype())->map());
// Install Date.prototype[@@toPrimitive].
{
Handle<String> key = factory()->Date_string();
Handle<JSFunction> date = Handle<JSFunction>::cast(
Object::GetProperty(handle(native_context()->global_object()), key)
.ToHandleChecked());
Handle<JSObject> proto =
Handle<JSObject>(JSObject::cast(date->instance_prototype()));
// Install the @@toPrimitive function.
Handle<JSFunction> to_primitive =
InstallFunction(proto, factory()->to_primitive_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, MaybeHandle<JSObject>(),
Builtins::kDateToPrimitive,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
// Set the expected parameters for @@toPrimitive to 1; required by builtin.
to_primitive->shared()->set_internal_formal_parameter_count(1);
// Set the length for the function to satisfy ECMA-262.
to_primitive->shared()->set_length(1);
}
// Install Array.prototype.concat
{
Handle<JSFunction> array_constructor(native_context()->array_function());
Handle<JSObject> proto(JSObject::cast(array_constructor->prototype()));
Handle<JSFunction> concat =
InstallFunction(proto, "concat", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kArrayConcat);
// Make sure that Array.prototype.concat appears to be compiled.
// The code will never be called, but inline caching for call will
// only work if it appears to be compiled.
concat->shared()->DontAdaptArguments();
DCHECK(concat->is_compiled());
// Set the lengths for the functions to satisfy ECMA-262.
concat->shared()->set_length(1);
}
// Install InternalArray.prototype.concat
{
Handle<JSFunction> array_constructor(
native_context()->internal_array_function());
Handle<JSObject> proto(JSObject::cast(array_constructor->prototype()));
Handle<JSFunction> concat =
InstallFunction(proto, "concat", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kArrayConcat);
// Make sure that InternalArray.prototype.concat appears to be compiled.
// The code will never be called, but inline caching for call will
// only work if it appears to be compiled.
concat->shared()->DontAdaptArguments();
DCHECK(concat->is_compiled());
// Set the lengths for the functions to satisfy ECMA-262.
concat->shared()->set_length(1);
}
// Install Function.prototype.call and apply.
{
Handle<String> key = factory()->Function_string();
Handle<JSFunction> function =
Handle<JSFunction>::cast(Object::GetProperty(
handle(native_context()->global_object()), key).ToHandleChecked());
Handle<JSObject> proto =
Handle<JSObject>(JSObject::cast(function->instance_prototype()));
// Install the call and the apply functions.
Handle<JSFunction> call =
InstallFunction(proto, "call", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kFunctionCall);
Handle<JSFunction> apply =
InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
MaybeHandle<JSObject>(), Builtins::kFunctionApply);
Handle<TypeFeedbackVector> feedback_vector =
TypeFeedbackVector::CreatePushAppliedArgumentsVector(isolate());
apply->shared()->set_feedback_vector(*feedback_vector);
// Make sure that Function.prototype.call appears to be compiled.
// The code will never be called, but inline caching for call will
// only work if it appears to be compiled.
call->shared()->DontAdaptArguments();
DCHECK(call->is_compiled());
// Set the expected parameters for apply to 2; required by builtin.
apply->shared()->set_internal_formal_parameter_count(2);
// Set the lengths for the functions to satisfy ECMA-262.
call->shared()->set_length(1);
apply->shared()->set_length(2);
}
InstallBuiltinFunctionIds();
// Create a constructor for RegExp results (a variant of Array that
// predefines the two properties index and match).
{
// RegExpResult initial map.
// Find global.Array.prototype to inherit from.
Handle<JSFunction> array_constructor(native_context()->array_function());
Handle<JSObject> array_prototype(
JSObject::cast(array_constructor->instance_prototype()));
// Add initial map.
Handle<Map> initial_map =
factory()->NewMap(JS_ARRAY_TYPE, JSRegExpResult::kSize);
initial_map->SetConstructor(*array_constructor);
// Set prototype on map.
initial_map->set_non_instance_prototype(false);
Map::SetPrototype(initial_map, array_prototype);
// Update map with length accessor from Array and add "index" and "input".
Map::EnsureDescriptorSlack(initial_map, 3);
{
JSFunction* array_function = native_context()->array_function();
Handle<DescriptorArray> array_descriptors(
array_function->initial_map()->instance_descriptors());
Handle<String> length = factory()->length_string();
int old = array_descriptors->SearchWithCache(
*length, array_function->initial_map());
DCHECK(old != DescriptorArray::kNotFound);
AccessorConstantDescriptor desc(
length, handle(array_descriptors->GetValue(old), isolate()),
array_descriptors->GetDetails(old).attributes());
initial_map->AppendDescriptor(&desc);
}
{
DataDescriptor index_field(factory()->index_string(),
JSRegExpResult::kIndexIndex, NONE,
Representation::Tagged());
initial_map->AppendDescriptor(&index_field);
}
{
DataDescriptor input_field(factory()->input_string(),
JSRegExpResult::kInputIndex, NONE,
Representation::Tagged());
initial_map->AppendDescriptor(&input_field);
}
initial_map->SetInObjectProperties(2);
initial_map->set_unused_property_fields(0);
native_context()->set_regexp_result_map(*initial_map);
}
// Add @@iterator method to the arguments object maps.
{
PropertyAttributes attribs = DONT_ENUM;
Handle<AccessorInfo> arguments_iterator =
Accessors::ArgumentsIteratorInfo(isolate(), attribs);
{
AccessorConstantDescriptor d(factory()->iterator_symbol(),
arguments_iterator, attribs);
Handle<Map> map(native_context()->sloppy_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
{
AccessorConstantDescriptor d(factory()->iterator_symbol(),
arguments_iterator, attribs);
Handle<Map> map(native_context()->fast_aliased_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
{
AccessorConstantDescriptor d(factory()->iterator_symbol(),
arguments_iterator, attribs);
Handle<Map> map(native_context()->slow_aliased_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
{
AccessorConstantDescriptor d(factory()->iterator_symbol(),
arguments_iterator, attribs);
Handle<Map> map(native_context()->strict_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
}
return true;
}
bool Genesis::InstallExperimentalNatives() {
static const char* harmony_array_includes_natives[] = {
"native harmony-array-includes.js", nullptr};
static const char* harmony_proxies_natives[] = {"native proxy.js", nullptr};
static const char* harmony_modules_natives[] = {nullptr};
static const char* harmony_regexps_natives[] = {"native harmony-regexp.js",
nullptr};
static const char* harmony_tostring_natives[] = {nullptr};
static const char* harmony_sloppy_natives[] = {nullptr};
static const char* harmony_sloppy_function_natives[] = {nullptr};
static const char* harmony_sloppy_let_natives[] = {nullptr};
static const char* harmony_unicode_regexps_natives[] = {nullptr};
static const char* harmony_rest_parameters_natives[] = {nullptr};
static const char* harmony_default_parameters_natives[] = {nullptr};
static const char* harmony_reflect_natives[] = {"native harmony-reflect.js",
nullptr};
static const char* harmony_destructuring_natives[] = {nullptr};
static const char* harmony_object_observe_natives[] = {
"native harmony-object-observe.js", nullptr};
static const char* harmony_sharedarraybuffer_natives[] = {
"native harmony-sharedarraybuffer.js", "native harmony-atomics.js", NULL};
static const char* harmony_concat_spreadable_natives[] = {nullptr};
static const char* harmony_simd_natives[] = {"native harmony-simd.js",
nullptr};
static const char* harmony_tolength_natives[] = {nullptr};
static const char* harmony_completion_natives[] = {nullptr};
static const char* harmony_do_expressions_natives[] = {nullptr};
static const char* harmony_regexp_subclass_natives[] = {nullptr};
for (int i = ExperimentalNatives::GetDebuggerCount();
i < ExperimentalNatives::GetBuiltinsCount(); i++) {
#define INSTALL_EXPERIMENTAL_NATIVES(id, desc) \
if (FLAG_##id) { \
for (size_t j = 0; id##_natives[j] != NULL; j++) { \
Vector<const char> script_name = ExperimentalNatives::GetScriptName(i); \
if (strncmp(script_name.start(), id##_natives[j], \
script_name.length()) == 0) { \
if (!Bootstrapper::CompileExperimentalBuiltin(isolate(), i)) { \
return false; \
} \
} \
} \
}
HARMONY_INPROGRESS(INSTALL_EXPERIMENTAL_NATIVES);
HARMONY_STAGED(INSTALL_EXPERIMENTAL_NATIVES);
HARMONY_SHIPPING(INSTALL_EXPERIMENTAL_NATIVES);
#undef INSTALL_EXPERIMENTAL_NATIVES
}
if (!CallUtilsFunction(isolate(), "PostExperimentals")) return false;
InstallExperimentalBuiltinFunctionIds();
return true;
}
bool Genesis::InstallExtraNatives() {
HandleScope scope(isolate());
Handle<JSObject> extras_binding =
factory()->NewJSObject(isolate()->object_function());
native_context()->set_extras_binding_object(*extras_binding);
for (int i = ExtraNatives::GetDebuggerCount();
i < ExtraNatives::GetBuiltinsCount(); i++) {
if (!Bootstrapper::CompileExtraBuiltin(isolate(), i)) return false;
}
return true;
}
bool Genesis::InstallExperimentalExtraNatives() {
for (int i = ExperimentalExtraNatives::GetDebuggerCount();
i < ExperimentalExtraNatives::GetBuiltinsCount(); i++) {
if (!Bootstrapper::CompileExperimentalExtraBuiltin(isolate(), i))
return false;
}
return true;
}
bool Genesis::InstallDebuggerNatives() {
for (int i = 0; i < Natives::GetDebuggerCount(); ++i) {
if (!Bootstrapper::CompileBuiltin(isolate(), i)) return false;
}
return CallUtilsFunction(isolate(), "PostDebug");
}
bool Bootstrapper::InstallCodeStubNatives(Isolate* isolate) {
for (int i = CodeStubNatives::GetDebuggerCount();
i < CodeStubNatives::GetBuiltinsCount(); i++) {
if (!CompileCodeStubBuiltin(isolate, i)) return false;
}
return true;
}
static void InstallBuiltinFunctionId(Handle<JSObject> holder,
const char* function_name,
BuiltinFunctionId id) {
Isolate* isolate = holder->GetIsolate();
Handle<Object> function_object =
Object::GetProperty(isolate, holder, function_name).ToHandleChecked();
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
function->shared()->set_function_data(Smi::FromInt(id));
}
#define INSTALL_BUILTIN_ID(holder_expr, fun_name, name) \
{ #holder_expr, #fun_name, k##name } \
,
void Genesis::InstallBuiltinFunctionIds() {
HandleScope scope(isolate());
struct BuiltinFunctionIds {
const char* holder_expr;
const char* fun_name;
BuiltinFunctionId id;
};
const BuiltinFunctionIds builtins[] = {
FUNCTIONS_WITH_ID_LIST(INSTALL_BUILTIN_ID)};
for (const BuiltinFunctionIds& builtin : builtins) {
Handle<JSObject> holder =
ResolveBuiltinIdHolder(native_context(), builtin.holder_expr);
InstallBuiltinFunctionId(holder, builtin.fun_name, builtin.id);
}
}
void Genesis::InstallExperimentalBuiltinFunctionIds() {
if (FLAG_harmony_sharedarraybuffer) {
struct BuiltinFunctionIds {
const char* holder_expr;
const char* fun_name;
BuiltinFunctionId id;
};
const BuiltinFunctionIds atomic_builtins[] = {
ATOMIC_FUNCTIONS_WITH_ID_LIST(INSTALL_BUILTIN_ID)};
for (const BuiltinFunctionIds& builtin : atomic_builtins) {
Handle<JSObject> holder =
ResolveBuiltinIdHolder(native_context(), builtin.holder_expr);
InstallBuiltinFunctionId(holder, builtin.fun_name, builtin.id);
}
}
}
#undef INSTALL_BUILTIN_ID
void Genesis::InitializeNormalizedMapCaches() {
Handle<NormalizedMapCache> cache = NormalizedMapCache::New(isolate());
native_context()->set_normalized_map_cache(*cache);
}
bool Bootstrapper::InstallExtensions(Handle<Context> native_context,
v8::ExtensionConfiguration* extensions) {
BootstrapperActive active(this);
SaveContext saved_context(isolate_);
isolate_->set_context(*native_context);
return Genesis::InstallExtensions(native_context, extensions) &&
Genesis::InstallSpecialObjects(native_context);
}
bool Genesis::InstallSpecialObjects(Handle<Context> native_context) {
Isolate* isolate = native_context->GetIsolate();
// Don't install extensions into the snapshot.
if (isolate->serializer_enabled()) return true;
Factory* factory = isolate->factory();
HandleScope scope(isolate);
Handle<JSGlobalObject> global(JSGlobalObject::cast(
native_context->global_object()));
Handle<JSObject> Error = Handle<JSObject>::cast(
Object::GetProperty(isolate, global, "Error").ToHandleChecked());
Handle<String> name =
factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("stackTraceLimit"));
Handle<Smi> stack_trace_limit(Smi::FromInt(FLAG_stack_trace_limit), isolate);
JSObject::AddProperty(Error, name, stack_trace_limit, NONE);
// Expose the debug global object in global if a name for it is specified.
if (FLAG_expose_debug_as != NULL && strlen(FLAG_expose_debug_as) != 0) {
// If loading fails we just bail out without installing the
// debugger but without tanking the whole context.
Debug* debug = isolate->debug();
if (!debug->Load()) return true;
Handle<Context> debug_context = debug->debug_context();
// Set the security token for the debugger context to the same as
// the shell native context to allow calling between these (otherwise
// exposing debug global object doesn't make much sense).
debug_context->set_security_token(native_context->security_token());
Handle<String> debug_string =
factory->InternalizeUtf8String(FLAG_expose_debug_as);
uint32_t index;
if (debug_string->AsArrayIndex(&index)) return true;
Handle<Object> global_proxy(debug_context->global_proxy(), isolate);
JSObject::AddProperty(global, debug_string, global_proxy, DONT_ENUM);
}
#if defined(V8_WASM)
WasmJs::Install(isolate, global);
#endif
return true;
}
static uint32_t Hash(RegisteredExtension* extension) {
return v8::internal::ComputePointerHash(extension);
}
Genesis::ExtensionStates::ExtensionStates() : map_(HashMap::PointersMatch, 8) {}
Genesis::ExtensionTraversalState Genesis::ExtensionStates::get_state(
RegisteredExtension* extension) {
i::HashMap::Entry* entry = map_.Lookup(extension, Hash(extension));
if (entry == NULL) {
return UNVISITED;
}
return static_cast<ExtensionTraversalState>(
reinterpret_cast<intptr_t>(entry->value));
}
void Genesis::ExtensionStates::set_state(RegisteredExtension* extension,
ExtensionTraversalState state) {
map_.LookupOrInsert(extension, Hash(extension))->value =
reinterpret_cast<void*>(static_cast<intptr_t>(state));
}
bool Genesis::InstallExtensions(Handle<Context> native_context,
v8::ExtensionConfiguration* extensions) {
Isolate* isolate = native_context->GetIsolate();
ExtensionStates extension_states; // All extensions have state UNVISITED.
return InstallAutoExtensions(isolate, &extension_states) &&
(!FLAG_expose_free_buffer ||
InstallExtension(isolate, "v8/free-buffer", &extension_states)) &&
(!FLAG_expose_gc ||
InstallExtension(isolate, "v8/gc", &extension_states)) &&
(!FLAG_expose_externalize_string ||
InstallExtension(isolate, "v8/externalize", &extension_states)) &&
(!FLAG_track_gc_object_stats ||
InstallExtension(isolate, "v8/statistics", &extension_states)) &&
(!FLAG_expose_trigger_failure ||
InstallExtension(isolate, "v8/trigger-failure", &extension_states)) &&
InstallRequestedExtensions(isolate, extensions, &extension_states);
}
bool Genesis::InstallAutoExtensions(Isolate* isolate,
ExtensionStates* extension_states) {
for (v8::RegisteredExtension* it = v8::RegisteredExtension::first_extension();
it != NULL;
it = it->next()) {
if (it->extension()->auto_enable() &&
!InstallExtension(isolate, it, extension_states)) {
return false;
}
}
return true;
}
bool Genesis::InstallRequestedExtensions(Isolate* isolate,
v8::ExtensionConfiguration* extensions,
ExtensionStates* extension_states) {
for (const char** it = extensions->begin(); it != extensions->end(); ++it) {
if (!InstallExtension(isolate, *it, extension_states)) return false;
}
return true;
}
// Installs a named extension. This methods is unoptimized and does
// not scale well if we want to support a large number of extensions.
bool Genesis::InstallExtension(Isolate* isolate,
const char* name,
ExtensionStates* extension_states) {
for (v8::RegisteredExtension* it = v8::RegisteredExtension::first_extension();
it != NULL;
it = it->next()) {
if (strcmp(name, it->extension()->name()) == 0) {
return InstallExtension(isolate, it, extension_states);
}
}
return Utils::ApiCheck(false,
"v8::Context::New()",
"Cannot find required extension");
}
bool Genesis::InstallExtension(Isolate* isolate,
v8::RegisteredExtension* current,
ExtensionStates* extension_states) {
HandleScope scope(isolate);
if (extension_states->get_state(current) == INSTALLED) return true;
// The current node has already been visited so there must be a
// cycle in the dependency graph; fail.
if (!Utils::ApiCheck(extension_states->get_state(current) != VISITED,
"v8::Context::New()",
"Circular extension dependency")) {
return false;
}
DCHECK(extension_states->get_state(current) == UNVISITED);
extension_states->set_state(current, VISITED);
v8::Extension* extension = current->extension();
// Install the extension's dependencies
for (int i = 0; i < extension->dependency_count(); i++) {
if (!InstallExtension(isolate,
extension->dependencies()[i],
extension_states)) {
return false;
}
}
// We do not expect this to throw an exception. Change this if it does.
bool result = CompileExtension(isolate, extension);
DCHECK(isolate->has_pending_exception() != result);
if (!result) {
// We print out the name of the extension that fail to install.
// When an error is thrown during bootstrapping we automatically print
// the line number at which this happened to the console in the isolate
// error throwing functionality.
base::OS::PrintError("Error installing extension '%s'.\n",
current->extension()->name());
isolate->clear_pending_exception();
}
extension_states->set_state(current, INSTALLED);
isolate->NotifyExtensionInstalled();
return result;
}
bool Genesis::ConfigureGlobalObjects(
v8::Local<v8::ObjectTemplate> global_proxy_template) {
Handle<JSObject> global_proxy(
JSObject::cast(native_context()->global_proxy()));
Handle<JSObject> global_object(
JSObject::cast(native_context()->global_object()));
if (!global_proxy_template.IsEmpty()) {
// Configure the global proxy object.
Handle<ObjectTemplateInfo> global_proxy_data =
v8::Utils::OpenHandle(*global_proxy_template);
if (!ConfigureApiObject(global_proxy, global_proxy_data)) return false;
// Configure the global object.
Handle<FunctionTemplateInfo> proxy_constructor(
FunctionTemplateInfo::cast(global_proxy_data->constructor()));
if (!proxy_constructor->prototype_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> global_object_data(
ObjectTemplateInfo::cast(proxy_constructor->prototype_template()));
if (!ConfigureApiObject(global_object, global_object_data)) return false;
}
}
SetObjectPrototype(global_proxy, global_object);
native_context()->set_initial_array_prototype(
JSArray::cast(native_context()->array_function()->prototype()));
native_context()->set_array_buffer_map(
native_context()->array_buffer_fun()->initial_map());
native_context()->set_js_map_map(
native_context()->js_map_fun()->initial_map());
native_context()->set_js_set_map(
native_context()->js_set_fun()->initial_map());
return true;
}
bool Genesis::ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template) {
DCHECK(!object_template.is_null());
DCHECK(FunctionTemplateInfo::cast(object_template->constructor())
->IsTemplateFor(object->map()));;
MaybeHandle<JSObject> maybe_obj =
ApiNatives::InstantiateObject(object_template);
Handle<JSObject> obj;
if (!maybe_obj.ToHandle(&obj)) {
DCHECK(isolate()->has_pending_exception());
isolate()->clear_pending_exception();
return false;
}
TransferObject(obj, object);
return true;
}
void Genesis::TransferNamedProperties(Handle<JSObject> from,
Handle<JSObject> to) {
// If JSObject::AddProperty asserts due to already existing property,
// it is likely due to both global objects sharing property name(s).
// Merging those two global objects is impossible.
// The global template must not create properties that already exist
// in the snapshotted global object.
if (from->HasFastProperties()) {
Handle<DescriptorArray> descs =
Handle<DescriptorArray>(from->map()->instance_descriptors());
for (int i = 0; i < from->map()->NumberOfOwnDescriptors(); i++) {
PropertyDetails details = descs->GetDetails(i);
switch (details.type()) {
case DATA: {
HandleScope inner(isolate());
Handle<Name> key = Handle<Name>(descs->GetKey(i));
FieldIndex index = FieldIndex::ForDescriptor(from->map(), i);
DCHECK(!descs->GetDetails(i).representation().IsDouble());
Handle<Object> value = Handle<Object>(from->RawFastPropertyAt(index),
isolate());
JSObject::AddProperty(to, key, value, details.attributes());
break;
}
case DATA_CONSTANT: {
HandleScope inner(isolate());
Handle<Name> key = Handle<Name>(descs->GetKey(i));
Handle<Object> constant(descs->GetConstant(i), isolate());
JSObject::AddProperty(to, key, constant, details.attributes());
break;
}
case ACCESSOR:
UNREACHABLE();
case ACCESSOR_CONSTANT: {
Handle<Name> key(descs->GetKey(i));
LookupIterator it(to, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
// If the property is already there we skip it
if (it.IsFound()) continue;
HandleScope inner(isolate());
DCHECK(!to->HasFastProperties());
// Add to dictionary.
Handle<Object> callbacks(descs->GetCallbacksObject(i), isolate());
PropertyDetails d(details.attributes(), ACCESSOR_CONSTANT, i + 1,
PropertyCellType::kMutable);
JSObject::SetNormalizedProperty(to, key, callbacks, d);
break;
}
}
}
} else if (from->IsJSGlobalObject()) {
Handle<GlobalDictionary> properties =
Handle<GlobalDictionary>(from->global_dictionary());
int capacity = properties->Capacity();
for (int i = 0; i < capacity; i++) {
Object* raw_key(properties->KeyAt(i));
if (properties->IsKey(raw_key)) {
DCHECK(raw_key->IsName());
// If the property is already there we skip it.
Handle<Name> key(Name::cast(raw_key));
LookupIterator it(to, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
if (it.IsFound()) continue;
// Set the property.
DCHECK(properties->ValueAt(i)->IsPropertyCell());
Handle<PropertyCell> cell(PropertyCell::cast(properties->ValueAt(i)));
Handle<Object> value(cell->value(), isolate());
if (value->IsTheHole()) continue;
PropertyDetails details = cell->property_details();
DCHECK_EQ(kData, details.kind());
JSObject::AddProperty(to, key, value, details.attributes());
}
}
} else {
Handle<NameDictionary> properties =
Handle<NameDictionary>(from->property_dictionary());
int capacity = properties->Capacity();
for (int i = 0; i < capacity; i++) {
Object* raw_key(properties->KeyAt(i));
if (properties->IsKey(raw_key)) {
DCHECK(raw_key->IsName());
// If the property is already there we skip it.
Handle<Name> key(Name::cast(raw_key));
LookupIterator it(to, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
if (it.IsFound()) continue;
// Set the property.
Handle<Object> value = Handle<Object>(properties->ValueAt(i),
isolate());
DCHECK(!value->IsCell());
DCHECK(!value->IsTheHole());
PropertyDetails details = properties->DetailsAt(i);
DCHECK_EQ(kData, details.kind());
JSObject::AddProperty(to, key, value, details.attributes());
}
}
}
}
void Genesis::TransferIndexedProperties(Handle<JSObject> from,
Handle<JSObject> to) {
// Cloning the elements array is sufficient.
Handle<FixedArray> from_elements =
Handle<FixedArray>(FixedArray::cast(from->elements()));
Handle<FixedArray> to_elements = factory()->CopyFixedArray(from_elements);
to->set_elements(*to_elements);
}
void Genesis::TransferObject(Handle<JSObject> from, Handle<JSObject> to) {
HandleScope outer(isolate());
DCHECK(!from->IsJSArray());
DCHECK(!to->IsJSArray());
TransferNamedProperties(from, to);
TransferIndexedProperties(from, to);
// Transfer the prototype (new map is needed).
Handle<Object> proto(from->map()->prototype(), isolate());
SetObjectPrototype(to, proto);
}
void Genesis::MakeFunctionInstancePrototypeWritable() {
// The maps with writable prototype are created in CreateEmptyFunction
// and CreateStrictModeFunctionMaps respectively. Initially the maps are
// created with read-only prototype for JS builtins processing.
DCHECK(!sloppy_function_map_writable_prototype_.is_null());
DCHECK(!strict_function_map_writable_prototype_.is_null());
// Replace function instance maps to make prototype writable.
native_context()->set_sloppy_function_map(
*sloppy_function_map_writable_prototype_);
native_context()->set_strict_function_map(
*strict_function_map_writable_prototype_);
}
class NoTrackDoubleFieldsForSerializerScope {
public:
explicit NoTrackDoubleFieldsForSerializerScope(Isolate* isolate)
: flag_(FLAG_track_double_fields), enabled_(false) {
if (isolate->serializer_enabled()) {
// Disable tracking double fields because heap numbers treated as
// immutable by the serializer.
FLAG_track_double_fields = false;
enabled_ = true;
}
}
~NoTrackDoubleFieldsForSerializerScope() {
if (enabled_) {
FLAG_track_double_fields = flag_;
}
}
private:
bool flag_;
bool enabled_;
};
Genesis::Genesis(Isolate* isolate,
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions,
ContextType context_type)
: isolate_(isolate), active_(isolate->bootstrapper()) {
NoTrackDoubleFieldsForSerializerScope disable_scope(isolate);
result_ = Handle<Context>::null();
// Before creating the roots we must save the context and restore it
// on all function exits.
SaveContext saved_context(isolate);
// During genesis, the boilerplate for stack overflow won't work until the
// environment has been at least partially initialized. Add a stack check
// before entering JS code to catch overflow early.
StackLimitCheck check(isolate);
if (check.HasOverflowed()) {
isolate->StackOverflow();
return;
}
// The deserializer needs to hook up references to the global proxy.
// Create an uninitialized global proxy now if we don't have one
// and initialize it later in CreateNewGlobals.
Handle<JSGlobalProxy> global_proxy;
if (!maybe_global_proxy.ToHandle(&global_proxy)) {
global_proxy = isolate->factory()->NewUninitializedJSGlobalProxy();
}
// We can only de-serialize a context if the isolate was initialized from
// a snapshot. Otherwise we have to build the context from scratch.
// Also create a context from scratch to expose natives, if required by flag.
Handle<FixedArray> outdated_contexts;
if (!isolate->initialized_from_snapshot() ||
!Snapshot::NewContextFromSnapshot(isolate, global_proxy,
&outdated_contexts)
.ToHandle(&native_context_)) {
native_context_ = Handle<Context>();
}
if (!native_context().is_null()) {
AddToWeakNativeContextList(*native_context());
isolate->set_context(*native_context());
isolate->counters()->contexts_created_by_snapshot()->Increment();
#if TRACE_MAPS
if (FLAG_trace_maps) {
Handle<JSFunction> object_fun = isolate->object_function();
PrintF("[TraceMap: InitialMap map= %p SFI= %d_Object ]\n",
reinterpret_cast<void*>(object_fun->initial_map()),
object_fun->shared()->unique_id());
Map::TraceAllTransitions(object_fun->initial_map());
}
#endif
Handle<JSGlobalObject> global_object =
CreateNewGlobals(global_proxy_template, global_proxy);
HookUpGlobalProxy(global_object, global_proxy);
HookUpGlobalObject(global_object, outdated_contexts);
HookUpGlobalThisBinding(outdated_contexts);
if (!ConfigureGlobalObjects(global_proxy_template)) return;
} else {
// We get here if there was no context snapshot.
CreateRoots();
Handle<JSFunction> empty_function = CreateEmptyFunction(isolate);
CreateStrictModeFunctionMaps(empty_function);
CreateStrongModeFunctionMaps(empty_function);
CreateIteratorMaps();
Handle<JSGlobalObject> global_object =
CreateNewGlobals(global_proxy_template, global_proxy);
HookUpGlobalProxy(global_object, global_proxy);
InitializeGlobal(global_object, empty_function, context_type);
InitializeNormalizedMapCaches();
if (!InstallNatives(context_type)) return;
MakeFunctionInstancePrototypeWritable();
if (context_type != THIN_CONTEXT) {
if (!InstallExtraNatives()) return;
if (!ConfigureGlobalObjects(global_proxy_template)) return;
}
isolate->counters()->contexts_created_from_scratch()->Increment();
// Re-initialize the counter because it got incremented during snapshot
// creation.
isolate->native_context()->set_errors_thrown(Smi::FromInt(0));
}
// Install experimental natives. Do not include them into the
// snapshot as we should be able to turn them off at runtime. Re-installing
// them after they have already been deserialized would also fail.
if (context_type == FULL_CONTEXT) {
if (!isolate->serializer_enabled()) {
InitializeExperimentalGlobal();
if (!InstallExperimentalNatives()) return;
if (FLAG_experimental_extras) {
if (!InstallExperimentalExtraNatives()) return;
}
}
// The serializer cannot serialize typed arrays. Reset those typed arrays
// for each new context.
} else if (context_type == DEBUG_CONTEXT) {
DCHECK(!isolate->serializer_enabled());
InitializeExperimentalGlobal();
if (!InstallDebuggerNatives()) return;
}
ConfigureUtilsObject(context_type);
// Check that the script context table is empty except for the 'this' binding.
// We do not need script contexts for native scripts.
if (!FLAG_global_var_shortcuts) {
DCHECK_EQ(1, native_context()->script_context_table()->used());
}
result_ = native_context();
}
// Support for thread preemption.
// Reserve space for statics needing saving and restoring.
int Bootstrapper::ArchiveSpacePerThread() {
return sizeof(NestingCounterType);
}
// Archive statics that are thread-local.
char* Bootstrapper::ArchiveState(char* to) {
*reinterpret_cast<NestingCounterType*>(to) = nesting_;
nesting_ = 0;
return to + sizeof(NestingCounterType);
}
// Restore statics that are thread-local.
char* Bootstrapper::RestoreState(char* from) {
nesting_ = *reinterpret_cast<NestingCounterType*>(from);
return from + sizeof(NestingCounterType);
}
// Called when the top-level V8 mutex is destroyed.
void Bootstrapper::FreeThreadResources() {
DCHECK(!IsActive());
}
} // namespace internal
} // namespace v8
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