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bootstrapper.cc
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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/base/ieee754.h"
#include "src/code-stubs.h"
#include "src/compiler.h"
#include "src/debug/debug.h"
#include "src/extensions/externalize-string-extension.h"
#include "src/extensions/free-buffer-extension.h"
#include "src/extensions/gc-extension.h"
#include "src/extensions/ignition-statistics-extension.h"
#include "src/extensions/statistics-extension.h"
#include "src/extensions/trigger-failure-extension.h"
#include "src/ffi/ffi-compiler.h"
#include "src/heap/heap.h"
#include "src/isolate-inl.h"
#include "src/snapshot/natives.h"
#include "src/snapshot/snapshot.h"
#include "src/wasm/wasm-js.h"
#if V8_INTL_SUPPORT
#include "src/objects/intl-objects.h"
#endif // V8_INTL_SUPPORT
namespace v8 {
namespace internal {
Bootstrapper::Bootstrapper(Isolate* isolate)
: isolate_(isolate),
nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION) {}
Handle<String> Bootstrapper::GetNativeSource(NativeType type, int index) {
NativesExternalStringResource* resource =
new NativesExternalStringResource(type, index);
Handle<ExternalOneByteString> source_code =
isolate_->factory()->NewNativeSourceString(resource);
isolate_->heap()->RegisterExternalString(*source_code);
DCHECK(source_code->is_short());
return source_code;
}
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;
v8::Extension* Bootstrapper::ignition_statistics_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_);
ignition_statistics_extension_ = new IgnitionStatisticsExtension;
v8::RegisterExtension(ignition_statistics_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;
delete ignition_statistics_extension_;
ignition_statistics_extension_ = NULL;
}
void Bootstrapper::TearDown() {
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,
size_t context_snapshot_index,
v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer,
GlobalContextType context_type);
Genesis(Isolate* isolate, MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template);
~Genesis() { }
Isolate* isolate() const { return isolate_; }
Factory* factory() const { return isolate_->factory(); }
Builtins* builtins() const { return isolate_->builtins(); }
Heap* heap() const { return isolate_->heap(); }
Handle<Context> result() { return result_; }
Handle<JSGlobalProxy> global_proxy() { return global_proxy_; }
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);
// Returns the %ThrowTypeError% intrinsic function.
// See ES#sec-%throwtypeerror% for details.
Handle<JSFunction> GetThrowTypeErrorIntrinsic();
void CreateSloppyModeFunctionMaps(Handle<JSFunction> empty);
void CreateStrictModeFunctionMaps(Handle<JSFunction> empty);
void CreateObjectFunction(Handle<JSFunction> empty);
void CreateIteratorMaps(Handle<JSFunction> empty);
void CreateAsyncIteratorMaps(Handle<JSFunction> empty);
void CreateAsyncFunctionMaps(Handle<JSFunction> empty);
void CreateJSProxyMaps();
// Make the "arguments" and "caller" properties throw a TypeError on access.
void AddRestrictedFunctionProperties(Handle<JSFunction> empty);
// 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 use the deserialized ones that are linked together with the
// rest of the context snapshot. At the end we link the global proxy and the
// context to each other.
Handle<JSGlobalObject> CreateNewGlobals(
v8::Local<v8::ObjectTemplate> global_proxy_template,
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);
// Hooks the given global proxy into the context in the case we do not
// replace the global object from the deserialized native context.
void HookUpGlobalProxy(Handle<JSGlobalProxy> global_proxy);
// 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();
// New context initialization. Used for creating a context from scratch.
void InitializeGlobal(Handle<JSGlobalObject> global_object,
Handle<JSFunction> empty_function,
GlobalContextType context_type);
void InitializeExperimentalGlobal();
// Depending on the situation, expose and/or get rid of the utils object.
void ConfigureUtilsObject(GlobalContextType 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> CreateArrayBuffer(Handle<String> name,
Builtins::Name call_byteLength,
BuiltinFunctionId byteLength_id,
Builtins::Name call_slice);
Handle<JSFunction> InstallInternalArray(Handle<JSObject> target,
const char* name,
ElementsKind elements_kind);
bool InstallNatives(GlobalContextType context_type);
void InstallTypedArray(const char* name, ElementsKind elements_kind,
Handle<JSFunction>* fun);
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:
base::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);
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_;
Handle<JSGlobalProxy> global_proxy_;
// Temporary function maps needed only during bootstrapping.
Handle<Map> strict_function_with_home_object_map_;
Handle<Map> strict_function_with_name_and_home_object_map_;
// %ThrowTypeError%. See ES#sec-%throwtypeerror% for details.
Handle<JSFunction> restricted_properties_thrower_;
BootstrapperActive active_;
friend class Bootstrapper;
};
void Bootstrapper::Iterate(RootVisitor* 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, size_t context_snapshot_index,
v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer,
GlobalContextType context_type) {
HandleScope scope(isolate_);
Genesis genesis(isolate_, maybe_global_proxy, global_proxy_template,
context_snapshot_index, embedder_fields_deserializer,
context_type);
Handle<Context> env = genesis.result();
if (env.is_null() || !InstallExtensions(env, extensions)) {
return Handle<Context>();
}
return scope.CloseAndEscape(env);
}
Handle<JSGlobalProxy> Bootstrapper::NewRemoteContext(
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template) {
HandleScope scope(isolate_);
Genesis genesis(isolate_, maybe_global_proxy, global_proxy_template);
Handle<JSGlobalProxy> global_proxy = genesis.global_proxy();
if (global_proxy.is_null()) return Handle<JSGlobalProxy>();
return scope.CloseAndEscape(global_proxy);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
Isolate* isolate = env->GetIsolate();
isolate->counters()->errors_thrown_per_context()->AddSample(
env->GetErrorsThrown());
Heap* heap = isolate->heap();
Handle<JSGlobalProxy> global_proxy(JSGlobalProxy::cast(env->global_proxy()));
global_proxy->set_native_context(heap->null_value());
JSObject::ForceSetPrototype(global_proxy, isolate->factory()->null_value());
global_proxy->map()->SetConstructor(heap->null_value());
if (FLAG_track_detached_contexts) {
env->GetIsolate()->AddDetachedContext(env);
}
}
namespace {
void InstallFunction(Handle<JSObject> target, Handle<Name> property_name,
Handle<JSFunction> function, Handle<String> function_name,
PropertyAttributes attributes = DONT_ENUM) {
JSObject::AddProperty(target, property_name, function, attributes);
if (target->IsJSGlobalObject()) {
function->shared()->set_instance_class_name(*function_name);
}
}
void InstallFunction(Handle<JSObject> target, Handle<JSFunction> function,
Handle<Name> name,
PropertyAttributes attributes = DONT_ENUM) {
Handle<String> name_string = Name::ToFunctionName(name).ToHandleChecked();
InstallFunction(target, name, function, name_string, attributes);
}
Handle<JSFunction> CreateFunction(Isolate* isolate, Handle<String> name,
InstanceType type, int instance_size,
MaybeHandle<Object> maybe_prototype,
Builtins::Name call) {
Factory* factory = isolate->factory();
Handle<Code> call_code(isolate->builtins()->builtin(call));
Handle<Object> prototype;
Handle<JSFunction> result =
maybe_prototype.ToHandle(&prototype)
? factory->NewFunction(name, call_code, prototype, type,
instance_size, STRICT, IMMUTABLE)
: factory->NewFunctionWithoutPrototype(name, call_code, STRICT);
result->shared()->set_native(true);
return result;
}
Handle<JSFunction> InstallFunction(Handle<JSObject> target, Handle<Name> name,
InstanceType type, int instance_size,
MaybeHandle<Object> maybe_prototype,
Builtins::Name call,
PropertyAttributes attributes) {
Handle<String> name_string = Name::ToFunctionName(name).ToHandleChecked();
Handle<JSFunction> function =
CreateFunction(target->GetIsolate(), name_string, type, instance_size,
maybe_prototype, call);
InstallFunction(target, name, function, name_string, attributes);
return function;
}
Handle<JSFunction> InstallFunction(Handle<JSObject> target, const char* name,
InstanceType type, int instance_size,
MaybeHandle<Object> maybe_prototype,
Builtins::Name call) {
Factory* const factory = target->GetIsolate()->factory();
PropertyAttributes attributes = DONT_ENUM;
return InstallFunction(target, factory->InternalizeUtf8String(name), type,
instance_size, maybe_prototype, call, attributes);
}
Handle<JSFunction> SimpleCreateFunction(Isolate* isolate, Handle<String> name,
Builtins::Name call, int len,
bool adapt) {
Handle<JSFunction> fun =
CreateFunction(isolate, 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);
return fun;
}
Handle<JSFunction> SimpleInstallFunction(
Handle<JSObject> base, Handle<Name> property_name,
Handle<String> function_name, Builtins::Name call, int len, bool adapt,
PropertyAttributes attrs = DONT_ENUM,
BuiltinFunctionId id = kInvalidBuiltinFunctionId) {
Handle<JSFunction> fun =
SimpleCreateFunction(base->GetIsolate(), function_name, call, len, adapt);
if (id != kInvalidBuiltinFunctionId) {
fun->shared()->set_builtin_function_id(id);
}
InstallFunction(base, fun, property_name, attrs);
return fun;
}
Handle<JSFunction> SimpleInstallFunction(
Handle<JSObject> base, Handle<String> name, Builtins::Name call, int len,
bool adapt, PropertyAttributes attrs = DONT_ENUM,
BuiltinFunctionId id = kInvalidBuiltinFunctionId) {
return SimpleInstallFunction(base, name, name, call, len, adapt, attrs, id);
}
Handle<JSFunction> SimpleInstallFunction(
Handle<JSObject> base, Handle<Name> property_name,
const char* function_name, Builtins::Name call, int len, bool adapt,
PropertyAttributes attrs = DONT_ENUM,
BuiltinFunctionId id = kInvalidBuiltinFunctionId) {
Factory* const factory = base->GetIsolate()->factory();
// Function name does not have to be internalized.
return SimpleInstallFunction(
base, property_name, factory->NewStringFromAsciiChecked(function_name),
call, len, adapt, attrs, id);
}
Handle<JSFunction> SimpleInstallFunction(
Handle<JSObject> base, const char* name, Builtins::Name call, int len,
bool adapt, PropertyAttributes attrs = DONT_ENUM,
BuiltinFunctionId id = kInvalidBuiltinFunctionId) {
Factory* const factory = base->GetIsolate()->factory();
// Although function name does not have to be internalized the property name
// will be internalized during property addition anyway, so do it here now.
return SimpleInstallFunction(base, factory->InternalizeUtf8String(name), call,
len, adapt, attrs, id);
}
Handle<JSFunction> SimpleInstallFunction(Handle<JSObject> base,
const char* name, Builtins::Name call,
int len, bool adapt,
BuiltinFunctionId id) {
return SimpleInstallFunction(base, name, call, len, adapt, DONT_ENUM, id);
}
void SimpleInstallGetterSetter(Handle<JSObject> base, Handle<String> name,
Builtins::Name call_getter,
Builtins::Name call_setter,
PropertyAttributes attribs) {
Isolate* const isolate = base->GetIsolate();
Handle<String> getter_name =
Name::ToFunctionName(name, isolate->factory()->get_string())
.ToHandleChecked();
Handle<JSFunction> getter =
SimpleCreateFunction(isolate, getter_name, call_getter, 0, true);
Handle<String> setter_name =
Name::ToFunctionName(name, isolate->factory()->set_string())
.ToHandleChecked();
Handle<JSFunction> setter =
SimpleCreateFunction(isolate, setter_name, call_setter, 1, true);
JSObject::DefineAccessor(base, name, getter, setter, attribs).Check();
}
Handle<JSFunction> SimpleInstallGetter(Handle<JSObject> base,
Handle<String> name,
Handle<Name> property_name,
Builtins::Name call, bool adapt) {
Isolate* const isolate = base->GetIsolate();
Handle<String> getter_name =
Name::ToFunctionName(name, isolate->factory()->get_string())
.ToHandleChecked();
Handle<JSFunction> getter =
SimpleCreateFunction(isolate, getter_name, call, 0, adapt);
Handle<Object> setter = isolate->factory()->undefined_value();
JSObject::DefineAccessor(base, property_name, getter, setter, DONT_ENUM)
.Check();
return getter;
}
Handle<JSFunction> SimpleInstallGetter(Handle<JSObject> base,
Handle<String> name, Builtins::Name call,
bool adapt) {
return SimpleInstallGetter(base, name, name, call, adapt);
}
Handle<JSFunction> SimpleInstallGetter(Handle<JSObject> base,
Handle<String> name, Builtins::Name call,
bool adapt, BuiltinFunctionId id) {
Handle<JSFunction> fun = SimpleInstallGetter(base, name, call, adapt);
fun->shared()->set_builtin_function_id(id);
return fun;
}
void InstallConstant(Isolate* isolate, Handle<JSObject> holder,
const char* name, Handle<Object> value) {
JSObject::AddProperty(
holder, isolate->factory()->NewStringFromAsciiChecked(name), value,
static_cast<PropertyAttributes>(DONT_DELETE | DONT_ENUM | READ_ONLY));
}
void InstallSpeciesGetter(Handle<JSFunction> constructor) {
Factory* factory = constructor->GetIsolate()->factory();
// TODO(adamk): We should be able to share a SharedFunctionInfo
// between all these JSFunctins.
SimpleInstallGetter(constructor, factory->symbol_species_string(),
factory->species_symbol(), Builtins::kReturnReceiver,
true);
}
} // namespace
Handle<JSFunction> Genesis::CreateEmptyFunction(Isolate* isolate) {
Factory* factory = isolate->factory();
// Allocate the function map first and then patch the prototype later.
Handle<Map> empty_function_map = factory->CreateSloppyFunctionMap(
FUNCTION_WITHOUT_PROTOTYPE, MaybeHandle<JSFunction>());
empty_function_map->set_is_prototype_map(true);
DCHECK(!empty_function_map->is_dictionary_map());
// Allocate the empty function as the prototype for function according to
// ES#sec-properties-of-the-function-prototype-object
Handle<Code> code(isolate->builtins()->EmptyFunction());
Handle<JSFunction> empty_function =
factory->NewFunction(empty_function_map, factory->empty_string(), code);
empty_function->shared()->set_language_mode(STRICT);
// --- E m p t y ---
Handle<String> source = factory->NewStringFromStaticChars("() {}");
Handle<Script> script = factory->NewScript(source);
script->set_type(Script::TYPE_NATIVE);
Handle<FixedArray> infos = factory->NewFixedArray(2);
script->set_shared_function_infos(*infos);
empty_function->shared()->set_start_position(0);
empty_function->shared()->set_end_position(source->length());
empty_function->shared()->set_function_literal_id(1);
empty_function->shared()->DontAdaptArguments();
SharedFunctionInfo::SetScript(handle(empty_function->shared()), script);
return empty_function;
}
void Genesis::CreateSloppyModeFunctionMaps(Handle<JSFunction> empty) {
Factory* factory = isolate_->factory();
Handle<Map> map;
//
// Allocate maps for sloppy functions without prototype.
//
map = factory->CreateSloppyFunctionMap(FUNCTION_WITHOUT_PROTOTYPE, empty);
native_context()->set_sloppy_function_without_prototype_map(*map);
//
// Allocate maps for sloppy functions with readonly prototype.
//
map =
factory->CreateSloppyFunctionMap(FUNCTION_WITH_READONLY_PROTOTYPE, empty);
native_context()->set_sloppy_function_with_readonly_prototype_map(*map);
//
// Allocate maps for sloppy functions with writable prototype.
//
map = factory->CreateSloppyFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE,
empty);
native_context()->set_sloppy_function_map(*map);
map = factory->CreateSloppyFunctionMap(
FUNCTION_WITH_NAME_AND_WRITEABLE_PROTOTYPE, empty);
native_context()->set_sloppy_function_with_name_map(*map);
}
Handle<JSFunction> Genesis::GetThrowTypeErrorIntrinsic() {
if (!restricted_properties_thrower_.is_null()) {
return restricted_properties_thrower_;
}
Handle<String> name(factory()->empty_string());
Handle<Code> code(builtins()->StrictPoisonPillThrower());
Handle<JSFunction> function =
factory()->NewFunctionWithoutPrototype(name, code, STRICT);
function->shared()->DontAdaptArguments();
// %ThrowTypeError% must not have a name property.
if (JSReceiver::DeleteProperty(function, factory()->name_string())
.IsNothing()) {
DCHECK(false);
}
// length needs to be non configurable.
Handle<Object> value(Smi::FromInt(function->shared()->GetLength()),
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);
}
JSObject::MigrateSlowToFast(function, 0, "Bootstrapping");
restricted_properties_thrower_ = function;
return function;
}
void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
Factory* factory = isolate_->factory();
Handle<Map> map;
//
// Allocate maps for strict functions without prototype.
//
map = factory->CreateStrictFunctionMap(FUNCTION_WITHOUT_PROTOTYPE, empty);
native_context()->set_strict_function_without_prototype_map(*map);
map = factory->CreateStrictFunctionMap(METHOD_WITH_NAME, empty);
native_context()->set_method_with_name_map(*map);
map = factory->CreateStrictFunctionMap(METHOD_WITH_HOME_OBJECT, empty);
native_context()->set_method_with_home_object_map(*map);
map =
factory->CreateStrictFunctionMap(METHOD_WITH_NAME_AND_HOME_OBJECT, empty);
native_context()->set_method_with_name_and_home_object_map(*map);
//
// Allocate maps for strict functions with writable prototype.
//
map = factory->CreateStrictFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE,
empty);
native_context()->set_strict_function_map(*map);
map = factory->CreateStrictFunctionMap(
FUNCTION_WITH_NAME_AND_WRITEABLE_PROTOTYPE, empty);
native_context()->set_strict_function_with_name_map(*map);
strict_function_with_home_object_map_ = factory->CreateStrictFunctionMap(
FUNCTION_WITH_HOME_OBJECT_AND_WRITEABLE_PROTOTYPE, empty);
strict_function_with_name_and_home_object_map_ =
factory->CreateStrictFunctionMap(
FUNCTION_WITH_NAME_AND_HOME_OBJECT_AND_WRITEABLE_PROTOTYPE, empty);
//
// Allocate maps for strict functions with readonly prototype.
//
map =
factory->CreateStrictFunctionMap(FUNCTION_WITH_READONLY_PROTOTYPE, empty);
native_context()->set_strict_function_with_readonly_prototype_map(*map);
//
// Allocate map for class functions.
//
map = factory->CreateClassFunctionMap(empty);
native_context()->set_class_function_map(*map);
// Now that the strict mode function map is available, set up the
// restricted "arguments" and "caller" getters.
AddRestrictedFunctionProperties(empty);
}
void Genesis::CreateObjectFunction(Handle<JSFunction> empty_function) {
Factory* factory = isolate_->factory();
// --- O b j e c t ---
int unused = JSObject::kInitialGlobalObjectUnusedPropertiesCount;
int instance_size = JSObject::kHeaderSize + kPointerSize * unused;
Handle<JSFunction> object_fun =
CreateFunction(isolate_, factory->Object_string(), JS_OBJECT_TYPE,
instance_size, factory->null_value(), Builtins::kIllegal);
native_context()->set_object_function(*object_fun);
{
// Finish setting up Object function's initial map.
Map* initial_map = object_fun->initial_map();
initial_map->SetInObjectProperties(unused);
initial_map->set_unused_property_fields(unused);
initial_map->set_elements_kind(HOLEY_ELEMENTS);
}
// Allocate a new prototype for the object function.
Handle<JSObject> object_function_prototype =
factory->NewFunctionPrototype(object_fun);
Handle<Map> map = Map::Copy(handle(object_function_prototype->map()),
"EmptyObjectPrototype");
map->set_is_prototype_map(true);
// Ban re-setting Object.prototype.__proto__ to prevent Proxy security bug
map->set_immutable_proto(true);
object_function_prototype->set_map(*map);
// Complete setting up empty function.
{
Handle<Map> empty_function_map(empty_function->map(), isolate_);
Map::SetPrototype(empty_function_map, object_function_prototype);
}
native_context()->set_initial_object_prototype(*object_function_prototype);
JSFunction::SetPrototype(object_fun, object_function_prototype);
{
// Set up slow map for Object.create(null) instances without in-object
// properties.
Handle<Map> map(object_fun->initial_map(), isolate_);
map = Map::CopyInitialMapNormalized(map);
Map::SetPrototype(map, factory->null_value());
native_context()->set_slow_object_with_null_prototype_map(*map);
// Set up slow map for literals with too many properties.
map = Map::Copy(map, "slow_object_with_object_prototype_map");
Map::SetPrototype(map, object_function_prototype);
native_context()->set_slow_object_with_object_prototype_map(*map);
}
}
namespace {
Handle<Map> CreateNonConstructorMap(Handle<Map> source_map,
Handle<JSObject> prototype,
const char* reason) {
Handle<Map> map = Map::Copy(source_map, reason);
map->set_is_constructor(false);
Map::SetPrototype(map, prototype);
return map;
}
} // namespace
void Genesis::CreateIteratorMaps(Handle<JSFunction> empty) {
// Create iterator-related meta-objects.
Handle<JSObject> iterator_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SimpleInstallFunction(iterator_prototype, factory()->iterator_symbol(),
"[Symbol.iterator]", Builtins::kReturnReceiver, 0,
true);
native_context()->set_initial_iterator_prototype(*iterator_prototype);
Handle<JSObject> generator_object_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
native_context()->set_initial_generator_prototype(
*generator_object_prototype);
JSObject::ForceSetPrototype(generator_object_prototype, iterator_prototype);
Handle<JSObject> generator_function_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
JSObject::ForceSetPrototype(generator_function_prototype, empty);
JSObject::AddProperty(
generator_function_prototype, factory()->to_string_tag_symbol(),
factory()->NewStringFromAsciiChecked("GeneratorFunction"),
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::AddProperty(generator_function_prototype,
factory()->prototype_string(),
generator_object_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::AddProperty(generator_object_prototype,
factory()->constructor_string(),
generator_function_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::AddProperty(generator_object_prototype,
factory()->to_string_tag_symbol(),
factory()->NewStringFromAsciiChecked("Generator"),
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
SimpleInstallFunction(generator_object_prototype, "next",
Builtins::kGeneratorPrototypeNext, 1, false);
SimpleInstallFunction(generator_object_prototype, "return",
Builtins::kGeneratorPrototypeReturn, 1, false);
SimpleInstallFunction(generator_object_prototype, "throw",
Builtins::kGeneratorPrototypeThrow, 1, false);
// Internal version of generator_prototype_next, flagged as non-native such
// that it doesn't show up in Error traces.
Handle<JSFunction> generator_next_internal =
SimpleCreateFunction(isolate(), factory()->next_string(),
Builtins::kGeneratorPrototypeNext, 1, false);
generator_next_internal->shared()->set_native(false);
native_context()->set_generator_next_internal(*generator_next_internal);
// 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).
// Generator functions do not have "caller" or "arguments" accessors.
Handle<Map> map;
map = CreateNonConstructorMap(isolate()->strict_function_map(),
generator_function_prototype,
"GeneratorFunction");
native_context()->set_generator_function_map(*map);
map = CreateNonConstructorMap(isolate()->strict_function_with_name_map(),
generator_function_prototype,
"GeneratorFunction with name");
native_context()->set_generator_function_with_name_map(*map);
map = CreateNonConstructorMap(strict_function_with_home_object_map_,
generator_function_prototype,
"GeneratorFunction with home object");
native_context()->set_generator_function_with_home_object_map(*map);
map = CreateNonConstructorMap(strict_function_with_name_and_home_object_map_,
generator_function_prototype,
"GeneratorFunction with name and home object");
native_context()->set_generator_function_with_name_and_home_object_map(*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);
}
void Genesis::CreateAsyncIteratorMaps(Handle<JSFunction> empty) {
// %AsyncIteratorPrototype%
// proposal-async-iteration/#sec-asynciteratorprototype
Handle<JSObject> async_iterator_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SimpleInstallFunction(
async_iterator_prototype, factory()->async_iterator_symbol(),
"[Symbol.asyncIterator]", Builtins::kReturnReceiver, 0, true);
// %AsyncFromSyncIteratorPrototype%
// proposal-async-iteration/#sec-%asyncfromsynciteratorprototype%-object
Handle<JSObject> async_from_sync_iterator_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SimpleInstallFunction(async_from_sync_iterator_prototype,
factory()->next_string(),
Builtins::kAsyncFromSyncIteratorPrototypeNext, 1, true);
SimpleInstallFunction(
async_from_sync_iterator_prototype, factory()->return_string(),
Builtins::kAsyncFromSyncIteratorPrototypeReturn, 1, true);
SimpleInstallFunction(
async_from_sync_iterator_prototype, factory()->throw_string(),
Builtins::kAsyncFromSyncIteratorPrototypeThrow, 1, true);
JSObject::AddProperty(
async_from_sync_iterator_prototype, factory()->to_string_tag_symbol(),
factory()->NewStringFromAsciiChecked("Async-from-Sync Iterator"),
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::ForceSetPrototype(async_from_sync_iterator_prototype,
async_iterator_prototype);
Handle<Map> async_from_sync_iterator_map = factory()->NewMap(
JS_ASYNC_FROM_SYNC_ITERATOR_TYPE, JSAsyncFromSyncIterator::kSize);
Map::SetPrototype(async_from_sync_iterator_map,
async_from_sync_iterator_prototype);
native_context()->set_async_from_sync_iterator_map(
*async_from_sync_iterator_map);
// Async Generators
Handle<String> AsyncGeneratorFunction_string =
factory()->NewStringFromAsciiChecked("AsyncGeneratorFunction", TENURED);
Handle<JSObject> async_generator_object_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Handle<JSObject> async_generator_function_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
// %AsyncGenerator% / %AsyncGeneratorFunction%.prototype
JSObject::ForceSetPrototype(async_generator_function_prototype, empty);
// The value of AsyncGeneratorFunction.prototype.prototype is the
// %AsyncGeneratorPrototype% intrinsic object.
// This property has the attributes
// { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }.
JSObject::AddProperty(async_generator_function_prototype,
factory()->prototype_string(),
async_generator_object_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::AddProperty(async_generator_function_prototype,
factory()->to_string_tag_symbol(),
AsyncGeneratorFunction_string,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
// %AsyncGeneratorPrototype%
JSObject::ForceSetPrototype(async_generator_object_prototype,
async_iterator_prototype);
JSObject::AddProperty(async_generator_object_prototype,
factory()->to_string_tag_symbol(),
factory()->NewStringFromAsciiChecked("AsyncGenerator"),
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
SimpleInstallFunction(async_generator_object_prototype, "next",
Builtins::kAsyncGeneratorPrototypeNext, 1, false);
SimpleInstallFunction(async_generator_object_prototype, "return",
Builtins::kAsyncGeneratorPrototypeReturn, 1, false);
SimpleInstallFunction(async_generator_object_prototype, "throw",
Builtins::kAsyncGeneratorPrototypeThrow, 1, false);
// 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).
// Async Generator functions do not have "caller" or "arguments" accessors.
Handle<Map> map;
map = CreateNonConstructorMap(isolate()->strict_function_map(),
async_generator_function_prototype,
"AsyncGeneratorFunction");
native_context()->set_async_generator_function_map(*map);
map = CreateNonConstructorMap(isolate()->strict_function_with_name_map(),
async_generator_function_prototype,
"AsyncGeneratorFunction with name");
native_context()->set_async_generator_function_with_name_map(*map);
map = CreateNonConstructorMap(strict_function_with_home_object_map_,
async_generator_function_prototype,
"AsyncGeneratorFunction with home object");
native_context()->set_async_generator_function_with_home_object_map(*map);
map = CreateNonConstructorMap(
strict_function_with_name_and_home_object_map_,
async_generator_function_prototype,
"AsyncGeneratorFunction with name and home object");
native_context()->set_async_generator_function_with_name_and_home_object_map(
*map);
Handle<JSFunction> object_function(native_context()->object_function());
Handle<Map> async_generator_object_prototype_map = Map::Create(isolate(), 0);
Map::SetPrototype(async_generator_object_prototype_map,
async_generator_object_prototype);
native_context()->set_async_generator_object_prototype_map(
*async_generator_object_prototype_map);
}
void Genesis::CreateAsyncFunctionMaps(Handle<JSFunction> empty) {
// %AsyncFunctionPrototype% intrinsic
Handle<JSObject> async_function_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
JSObject::ForceSetPrototype(async_function_prototype, empty);
JSObject::AddProperty(async_function_prototype,
factory()->to_string_tag_symbol(),
factory()->NewStringFromAsciiChecked("AsyncFunction"),
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
Handle<Map> map;
map = CreateNonConstructorMap(
isolate()->strict_function_without_prototype_map(),
async_function_prototype, "AsyncFunction");
native_context()->set_async_function_map(*map);
map = CreateNonConstructorMap(isolate()->method_with_name_map(),
async_function_prototype,
"AsyncFunction with name");
native_context()->set_async_function_with_name_map(*map);
map = CreateNonConstructorMap(isolate()->method_with_home_object_map(),
async_function_prototype,
"AsyncFunction with home object");
native_context()->set_async_function_with_home_object_map(*map);
map = CreateNonConstructorMap(
isolate()->method_with_name_and_home_object_map(),
async_function_prototype, "AsyncFunction with name and home object");
native_context()->set_async_function_with_name_and_home_object_map(*map);
}
void Genesis::CreateJSProxyMaps() {
// Allocate maps for all Proxy types.
// Next to the default proxy, we need maps indicating callable and
// constructable proxies.
Handle<Map> proxy_map =
factory()->NewMap(JS_PROXY_TYPE, JSProxy::kSize, PACKED_ELEMENTS);
proxy_map->set_dictionary_map(true);
native_context()->set_proxy_map(*proxy_map);
Handle<Map> proxy_callable_map = Map::Copy(proxy_map, "callable Proxy");
proxy_callable_map->set_is_callable();
native_context()->set_proxy_callable_map(*proxy_callable_map);
proxy_callable_map->SetConstructor(native_context()->function_function());
Handle<Map> proxy_constructor_map =
Map::Copy(proxy_callable_map, "constructor Proxy");
proxy_constructor_map->set_is_constructor(true);
native_context()->set_proxy_constructor_map(*proxy_constructor_map);
}
namespace {
void ReplaceAccessors(Handle<Map> map, Handle<String> name,
PropertyAttributes attributes,
Handle<AccessorPair> accessor_pair) {
DescriptorArray* descriptors = map->instance_descriptors();
int idx = descriptors->SearchWithCache(map->GetIsolate(), *name, *map);
Descriptor d = Descriptor::AccessorConstant(name, accessor_pair, attributes);
descriptors->Replace(idx, &d);
}
} // namespace
void Genesis::AddRestrictedFunctionProperties(Handle<JSFunction> empty) {
PropertyAttributes rw_attribs = static_cast<PropertyAttributes>(DONT_ENUM);
Handle<JSFunction> thrower = GetThrowTypeErrorIntrinsic();
Handle<AccessorPair> accessors = factory()->NewAccessorPair();
accessors->set_getter(*thrower);
accessors->set_setter(*thrower);
Handle<Map> map(empty->map());
ReplaceAccessors(map, factory()->arguments_string(), rw_attribs, accessors);
ReplaceAccessors(map, factory()->caller_string(), rw_attribs, accessors);
}
static void AddToWeakNativeContextList(Context* context) {
DCHECK(context->IsNativeContext());