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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/init/bootstrapper.h"
#include "src/api/api-inl.h"
#include "src/api/api-natives.h"
#include "src/base/hashmap.h"
#include "src/base/ieee754.h"
#include "src/builtins/accessors.h"
#include "src/codegen/compiler.h"
#include "src/common/globals.h"
#include "src/debug/debug.h"
#include "src/execution/isolate-inl.h"
#include "src/execution/microtask-queue.h"
#include "src/execution/protectors.h"
#include "src/extensions/cputracemark-extension.h"
#include "src/extensions/externalize-string-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/logging/runtime-call-stats-scope.h"
#include "src/objects/instance-type.h"
#include "src/objects/js-array.h"
#include "src/objects/objects.h"
#include "src/sandbox/testing.h"
#ifdef ENABLE_VTUNE_TRACEMARK
#include "src/extensions/vtunedomain-support-extension.h"
#endif // ENABLE_VTUNE_TRACEMARK
#include "src/heap/heap-inl.h"
#include "src/logging/counters.h"
#include "src/logging/log.h"
#include "src/numbers/math-random.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/arguments.h"
#include "src/objects/function-kind.h"
#include "src/objects/hash-table-inl.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/intl-objects.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-atomics-synchronization.h"
#include "src/objects/js-iterator-helpers.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-break-iterator.h"
#include "src/objects/js-collator.h"
#include "src/objects/js-date-time-format.h"
#include "src/objects/js-display-names.h"
#include "src/objects/js-duration-format.h"
#include "src/objects/js-list-format.h"
#include "src/objects/js-locale.h"
#include "src/objects/js-number-format.h"
#include "src/objects/js-plural-rules.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-regexp-string-iterator.h"
#include "src/objects/js-regexp.h"
#include "src/objects/js-shadow-realm.h"
#ifdef V8_INTL_SUPPORT
#include "src/objects/js-relative-time-format.h"
#include "src/objects/js-segment-iterator.h"
#include "src/objects/js-segmenter.h"
#include "src/objects/js-segments.h"
#endif // V8_INTL_SUPPORT
#include "src/codegen/script-details.h"
#include "src/objects/js-raw-json.h"
#include "src/objects/js-shared-array.h"
#include "src/objects/js-struct.h"
#include "src/objects/js-temporal-objects-inl.h"
#include "src/objects/js-weak-refs.h"
#include "src/objects/ordered-hash-table.h"
#include "src/objects/property-cell.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/slots-inl.h"
#include "src/objects/swiss-name-dictionary-inl.h"
#include "src/objects/templates.h"
#include "src/snapshot/snapshot.h"
#include "src/zone/zone-hashmap.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/wasm/wasm-js.h"
#endif // V8_ENABLE_WEBASSEMBLY
namespace v8 {
namespace internal {
void SourceCodeCache::Initialize(Isolate* isolate, bool create_heap_objects) {
cache_ = create_heap_objects ? ReadOnlyRoots(isolate).empty_fixed_array()
: FixedArray();
}
void SourceCodeCache::Iterate(RootVisitor* v) {
v->VisitRootPointer(Root::kExtensions, nullptr, FullObjectSlot(&cache_));
}
bool SourceCodeCache::Lookup(Isolate* isolate, base::Vector<const char> name,
Handle<SharedFunctionInfo>* handle) {
for (int i = 0; i < cache_.length(); i += 2) {
SeqOneByteString str = SeqOneByteString::cast(cache_.get(i));
if (str.IsOneByteEqualTo(name)) {
*handle = Handle<SharedFunctionInfo>(
SharedFunctionInfo::cast(cache_.get(i + 1)), isolate);
return true;
}
}
return false;
}
void SourceCodeCache::Add(Isolate* isolate, base::Vector<const char> name,
Handle<SharedFunctionInfo> shared) {
Factory* factory = isolate->factory();
HandleScope scope(isolate);
int length = cache_.length();
Handle<FixedArray> new_array =
factory->NewFixedArray(length + 2, AllocationType::kOld);
cache_.CopyTo(0, *new_array, 0, cache_.length());
cache_ = *new_array;
Handle<String> str =
factory
->NewStringFromOneByte(base::Vector<const uint8_t>::cast(name),
AllocationType::kOld)
.ToHandleChecked();
DCHECK(!str.is_null());
cache_.set(length, *str);
cache_.set(length + 1, *shared);
Script::cast(shared->script()).set_type(type_);
}
Bootstrapper::Bootstrapper(Isolate* isolate)
: isolate_(isolate),
nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION) {}
void Bootstrapper::Initialize(bool create_heap_objects) {
extensions_cache_.Initialize(isolate_, create_heap_objects);
}
static const char* GCFunctionName() {
bool flag_given =
v8_flags.expose_gc_as != nullptr && strlen(v8_flags.expose_gc_as) != 0;
return flag_given ? v8_flags.expose_gc_as : "gc";
}
static bool isValidCpuTraceMarkFunctionName() {
return v8_flags.expose_cputracemark_as != nullptr &&
strlen(v8_flags.expose_cputracemark_as) != 0;
}
void Bootstrapper::InitializeOncePerProcess() {
v8::RegisterExtension(std::make_unique<GCExtension>(GCFunctionName()));
v8::RegisterExtension(std::make_unique<ExternalizeStringExtension>());
v8::RegisterExtension(std::make_unique<StatisticsExtension>());
v8::RegisterExtension(std::make_unique<TriggerFailureExtension>());
v8::RegisterExtension(std::make_unique<IgnitionStatisticsExtension>());
if (isValidCpuTraceMarkFunctionName()) {
v8::RegisterExtension(std::make_unique<CpuTraceMarkExtension>(
v8_flags.expose_cputracemark_as));
}
#ifdef ENABLE_VTUNE_TRACEMARK
v8::RegisterExtension(
std::make_unique<VTuneDomainSupportExtension>("vtunedomainmark"));
#endif // ENABLE_VTUNE_TRACEMARK
}
void Bootstrapper::TearDown() {
extensions_cache_.Initialize(isolate_, false); // Yes, symmetrical
}
class Genesis {
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,
v8::MicrotaskQueue* microtask_queue);
Genesis(Isolate* isolate, MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template);
~Genesis() = default;
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<NativeContext> 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();
// 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 context 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);
void InitializeExperimentalGlobal();
void InitializeIteratorFunctions();
void InitializeCallSiteBuiltins();
void InitializeConsole(Handle<JSObject> extras_binding);
#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
void InitializeGlobal_regexp_linear_flag();
enum ArrayBufferKind { ARRAY_BUFFER, SHARED_ARRAY_BUFFER };
Handle<JSFunction> CreateArrayBuffer(Handle<String> name,
ArrayBufferKind array_buffer_kind);
bool InstallABunchOfRandomThings();
bool InstallExtrasBindings();
Handle<JSFunction> InstallTypedArray(const char* name,
ElementsKind elements_kind,
InstanceType constructor_type,
int rab_gsab_initial_map_index);
void InitializeMapCaches();
enum ExtensionTraversalState { UNVISITED, VISITED, INSTALLED };
class ExtensionStates {
public:
ExtensionStates();
ExtensionStates(const ExtensionStates&) = delete;
ExtensionStates& operator=(const ExtensionStates&) = delete;
ExtensionTraversalState get_state(RegisteredExtension* extension);
void set_state(RegisteredExtension* extension,
ExtensionTraversalState state);
private:
base::HashMap map_;
};
// Used both for deserialized and from-scratch contexts to add the extensions
// provided.
static bool InstallExtensions(Isolate* isolate,
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(Isolate* isolate,
Handle<Context> native_context);
bool ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template);
bool ConfigureGlobalObject(
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);
Handle<Map> CreateInitialMapForArraySubclass(int size,
int inobject_properties);
static bool CompileExtension(Isolate* isolate, v8::Extension* extension);
Isolate* isolate_;
Handle<Context> result_;
Handle<NativeContext> native_context_;
Handle<JSGlobalProxy> global_proxy_;
// %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,
v8::MicrotaskQueue* microtask_queue) {
HandleScope scope(isolate_);
Handle<Context> env;
{
Genesis genesis(isolate_, maybe_global_proxy, global_proxy_template,
context_snapshot_index, embedder_fields_deserializer,
microtask_queue);
env = genesis.result();
if (env.is_null() || !InstallExtensions(env, extensions)) {
return Handle<Context>();
}
}
LogAllMaps();
isolate_->heap()->NotifyBootstrapComplete();
return scope.CloseAndEscape(env);
}
Handle<JSGlobalProxy> Bootstrapper::NewRemoteContext(
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Local<v8::ObjectTemplate> global_proxy_template) {
HandleScope scope(isolate_);
Handle<JSGlobalProxy> global_proxy;
{
Genesis genesis(isolate_, maybe_global_proxy, global_proxy_template);
global_proxy = genesis.global_proxy();
if (global_proxy.is_null()) return Handle<JSGlobalProxy>();
}
LogAllMaps();
return scope.CloseAndEscape(global_proxy);
}
void Bootstrapper::LogAllMaps() {
if (!v8_flags.log_maps || isolate_->initialized_from_snapshot()) return;
// Log all created Map objects that are on the heap. For snapshots the Map
// logging happens during deserialization in order to avoid printing Maps
// multiple times during partial deserialization.
LOG(isolate_, LogAllMaps());
}
namespace {
#ifdef DEBUG
bool IsFunctionMapOrSpecialBuiltin(Handle<Map> map, Builtin builtin,
Handle<Context> context) {
// During bootstrapping some of these maps could be not created yet.
return ((*map == context->get(Context::STRICT_FUNCTION_MAP_INDEX)) ||
(*map == context->get(
Context::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX)) ||
(*map ==
context->get(
Context::STRICT_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX)) ||
// Check if it's a creation of an empty or Proxy function during
// bootstrapping.
(builtin == Builtin::kEmptyFunction ||
builtin == Builtin::kProxyConstructor));
}
#endif // DEBUG
V8_NOINLINE Handle<JSFunction> CreateFunctionForBuiltin(Isolate* isolate,
Handle<String> name,
Handle<Map> map,
Builtin builtin) {
Factory* factory = isolate->factory();
Handle<NativeContext> context(isolate->native_context());
DCHECK(IsFunctionMapOrSpecialBuiltin(map, builtin, context));
Handle<SharedFunctionInfo> info =
factory->NewSharedFunctionInfoForBuiltin(name, builtin);
info->set_language_mode(LanguageMode::kStrict);
return Factory::JSFunctionBuilder{isolate, info, context}
.set_map(map)
.Build();
}
V8_NOINLINE Handle<JSFunction> CreateFunctionForBuiltinWithPrototype(
Isolate* isolate, Handle<String> name, Builtin builtin,
Handle<HeapObject> prototype, InstanceType type, int instance_size,
int inobject_properties, MutableMode prototype_mutability) {
Factory* factory = isolate->factory();
Handle<NativeContext> context(isolate->native_context());
Handle<Map> map =
prototype_mutability == MUTABLE
? isolate->strict_function_map()
: isolate->strict_function_with_readonly_prototype_map();
DCHECK(IsFunctionMapOrSpecialBuiltin(map, builtin, context));
Handle<SharedFunctionInfo> info =
factory->NewSharedFunctionInfoForBuiltin(name, builtin);
info->set_language_mode(LanguageMode::kStrict);
info->set_expected_nof_properties(inobject_properties);
Handle<JSFunction> result =
Factory::JSFunctionBuilder{isolate, info, context}.set_map(map).Build();
ElementsKind elements_kind;
switch (type) {
case JS_ARRAY_TYPE:
elements_kind = PACKED_SMI_ELEMENTS;
break;
case JS_ARGUMENTS_OBJECT_TYPE:
elements_kind = PACKED_ELEMENTS;
break;
default:
elements_kind = TERMINAL_FAST_ELEMENTS_KIND;
break;
}
Handle<Map> initial_map =
factory->NewMap(type, instance_size, elements_kind, inobject_properties);
if (type == JS_FUNCTION_TYPE) {
DCHECK_EQ(instance_size, JSFunction::kSizeWithPrototype);
// Since we are creating an initial map for JSFunction objects with
// prototype slot, set the respective bit.
initial_map->set_has_prototype_slot(true);
}
// TODO(littledan): Why do we have this is_generator test when
// NewFunctionPrototype already handles finding an appropriately
// shared prototype?
if (!IsResumableFunction(info->kind()) && prototype->IsTheHole(isolate)) {
prototype = factory->NewFunctionPrototype(result);
}
JSFunction::SetInitialMap(isolate, result, initial_map, prototype);
return result;
}
V8_NOINLINE Handle<JSFunction> CreateFunctionForBuiltinWithoutPrototype(
Isolate* isolate, Handle<String> name, Builtin builtin) {
Factory* factory = isolate->factory();
Handle<NativeContext> context(isolate->native_context());
Handle<Map> map = isolate->strict_function_without_prototype_map();
DCHECK(IsFunctionMapOrSpecialBuiltin(map, builtin, context));
Handle<SharedFunctionInfo> info =
factory->NewSharedFunctionInfoForBuiltin(name, builtin);
info->set_language_mode(LanguageMode::kStrict);
return Factory::JSFunctionBuilder{isolate, info, context}
.set_map(map)
.Build();
}
V8_NOINLINE Handle<JSFunction> CreateFunction(
Isolate* isolate, Handle<String> name, InstanceType type, int instance_size,
int inobject_properties, Handle<HeapObject> prototype, Builtin builtin) {
DCHECK(Builtins::HasJSLinkage(builtin));
Handle<JSFunction> result = CreateFunctionForBuiltinWithPrototype(
isolate, name, builtin, prototype, type, instance_size,
inobject_properties, IMMUTABLE);
// Make the JSFunction's prototype object fast.
JSObject::MakePrototypesFast(handle(result->prototype(), isolate),
kStartAtReceiver, isolate);
// Make the resulting JSFunction object fast.
JSObject::MakePrototypesFast(result, kStartAtReceiver, isolate);
result->shared().set_native(true);
return result;
}
V8_NOINLINE Handle<JSFunction> CreateFunction(
Isolate* isolate, const char* name, InstanceType type, int instance_size,
int inobject_properties, Handle<HeapObject> prototype, Builtin builtin) {
return CreateFunction(isolate,
isolate->factory()->InternalizeUtf8String(name), type,
instance_size, inobject_properties, prototype, builtin);
}
V8_NOINLINE Handle<JSFunction> InstallFunction(
Isolate* isolate, Handle<JSObject> target, Handle<String> name,
InstanceType type, int instance_size, int inobject_properties,
Handle<HeapObject> prototype, Builtin call) {
DCHECK(Builtins::HasJSLinkage(call));
Handle<JSFunction> function = CreateFunction(
isolate, name, type, instance_size, inobject_properties, prototype, call);
JSObject::AddProperty(isolate, target, name, function, DONT_ENUM);
return function;
}
V8_NOINLINE Handle<JSFunction> InstallFunction(
Isolate* isolate, Handle<JSObject> target, const char* name,
InstanceType type, int instance_size, int inobject_properties,
Handle<HeapObject> prototype, Builtin call) {
return InstallFunction(isolate, target,
isolate->factory()->InternalizeUtf8String(name), type,
instance_size, inobject_properties, prototype, call);
}
V8_NOINLINE Handle<JSFunction> CreateSharedObjectConstructor(
Isolate* isolate, Handle<String> name, InstanceType type, int instance_size,
int inobject_properties, ElementsKind element_kind, Builtin builtin) {
Factory* factory = isolate->factory();
Handle<SharedFunctionInfo> info = factory->NewSharedFunctionInfoForBuiltin(
name, builtin, FunctionKind::kNormalFunction);
info->set_language_mode(LanguageMode::kStrict);
Handle<JSFunction> constructor =
Factory::JSFunctionBuilder{isolate, info, isolate->native_context()}
.set_map(isolate->strict_function_with_readonly_prototype_map())
.Build();
Handle<Map> instance_map =
factory->NewMap(type, instance_size, element_kind, inobject_properties,
AllocationType::kSharedMap);
// Shared objects have fixed layout ahead of time, so there's no slack.
instance_map->SetInObjectUnusedPropertyFields(0);
// Shared objects are not extensible and have a null prototype.
instance_map->set_is_extensible(false);
JSFunction::SetInitialMap(isolate, constructor, instance_map,
factory->null_value(), factory->null_value());
constructor->map().SetConstructor(ReadOnlyRoots(isolate).null_value());
constructor->map().set_has_non_instance_prototype(true);
return constructor;
}
// This sets a constructor instance type on the constructor map which will be
// used in IsXxxConstructor() predicates. Having such predicates helps figuring
// out if a protector cell should be invalidated. If there are no protector
// cell checks required for constructor, this function must not be used.
// Note, this function doesn't create a copy of the constructor's map. So it's
// better to set constructor instance type after all the properties are added
// to the constructor and thus the map is already guaranteed to be unique.
V8_NOINLINE void SetConstructorInstanceType(Isolate* isolate,
Handle<JSFunction> constructor,
InstanceType constructor_type) {
DCHECK(InstanceTypeChecker::IsJSFunction(constructor_type));
DCHECK_NE(constructor_type, JS_FUNCTION_TYPE);
Map map = constructor->map();
// Check we don't accidentally change one of the existing maps.
DCHECK_NE(map, *isolate->strict_function_map());
DCHECK_NE(map, *isolate->strict_function_with_readonly_prototype_map());
// Constructor function map is always a root map, and thus we don't have to
// deal with updating the whole transition tree.
DCHECK(map.GetBackPointer().IsUndefined(isolate));
DCHECK_EQ(JS_FUNCTION_TYPE, map.instance_type());
map.set_instance_type(constructor_type);
}
V8_NOINLINE Handle<JSFunction> SimpleCreateFunction(Isolate* isolate,
Handle<String> name,
Builtin call, int len,
bool adapt) {
DCHECK(Builtins::HasJSLinkage(call));
name = String::Flatten(isolate, name, AllocationType::kOld);
Handle<JSFunction> fun =
CreateFunctionForBuiltinWithoutPrototype(isolate, name, call);
// Make the resulting JSFunction object fast.
JSObject::MakePrototypesFast(fun, kStartAtReceiver, isolate);
fun->shared().set_native(true);
if (adapt) {
fun->shared().set_internal_formal_parameter_count(JSParameterCount(len));
} else {
fun->shared().DontAdaptArguments();
}
fun->shared().set_length(len);
return fun;
}
V8_NOINLINE Handle<JSFunction> InstallFunctionWithBuiltinId(
Isolate* isolate, Handle<JSObject> base, const char* name, Builtin call,
int len, bool adapt) {
Handle<String> internalized_name =
isolate->factory()->InternalizeUtf8String(name);
Handle<JSFunction> fun =
SimpleCreateFunction(isolate, internalized_name, call, len, adapt);
JSObject::AddProperty(isolate, base, internalized_name, fun, DONT_ENUM);
return fun;
}
V8_NOINLINE Handle<JSFunction> InstallFunctionAtSymbol(
Isolate* isolate, Handle<JSObject> base, Handle<Symbol> symbol,
const char* symbol_string, Builtin call, int len, bool adapt,
PropertyAttributes attrs = DONT_ENUM) {
Handle<String> internalized_symbol =
isolate->factory()->InternalizeUtf8String(symbol_string);
Handle<JSFunction> fun =
SimpleCreateFunction(isolate, internalized_symbol, call, len, adapt);
JSObject::AddProperty(isolate, base, symbol, fun, attrs);
return fun;
}
V8_NOINLINE void SimpleInstallGetterSetter(Isolate* isolate,
Handle<JSObject> base,
Handle<String> name,
Builtin call_getter,
Builtin call_setter) {
Handle<String> getter_name =
Name::ToFunctionName(isolate, name, isolate->factory()->get_string())
.ToHandleChecked();
Handle<JSFunction> getter =
SimpleCreateFunction(isolate, getter_name, call_getter, 0, true);
Handle<String> setter_name =
Name::ToFunctionName(isolate, name, isolate->factory()->set_string())
.ToHandleChecked();
Handle<JSFunction> setter =
SimpleCreateFunction(isolate, setter_name, call_setter, 1, true);
JSObject::DefineAccessor(base, name, getter, setter, DONT_ENUM).Check();
}
void SimpleInstallGetterSetter(Isolate* isolate, Handle<JSObject> base,
const char* name, Builtin call_getter,
Builtin call_setter) {
SimpleInstallGetterSetter(isolate, base,
isolate->factory()->InternalizeUtf8String(name),
call_getter, call_setter);
}
V8_NOINLINE Handle<JSFunction> SimpleInstallGetter(Isolate* isolate,
Handle<JSObject> base,
Handle<Name> name,
Handle<Name> property_name,
Builtin call, bool adapt) {
Handle<String> getter_name =
Name::ToFunctionName(isolate, 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;
}
V8_NOINLINE Handle<JSFunction> SimpleInstallGetter(Isolate* isolate,
Handle<JSObject> base,
Handle<Name> name,
Builtin call, bool adapt) {
return SimpleInstallGetter(isolate, base, name, name, call, adapt);
}
V8_NOINLINE void InstallConstant(Isolate* isolate, Handle<JSObject> holder,
const char* name, Handle<Object> value) {
JSObject::AddProperty(
isolate, holder, isolate->factory()->InternalizeUtf8String(name), value,
static_cast<PropertyAttributes>(DONT_DELETE | DONT_ENUM | READ_ONLY));
}
V8_NOINLINE void InstallTrueValuedProperty(Isolate* isolate,
Handle<JSObject> holder,
const char* name) {
JSObject::AddProperty(isolate, holder,
isolate->factory()->InternalizeUtf8String(name),
isolate->factory()->true_value(), NONE);
}
V8_NOINLINE void InstallSpeciesGetter(Isolate* isolate,
Handle<JSFunction> constructor) {
Factory* factory = isolate->factory();
// TODO(adamk): We should be able to share a SharedFunctionInfo
// between all these JSFunctins.
SimpleInstallGetter(isolate, constructor, factory->symbol_species_string(),
factory->species_symbol(), Builtin::kReturnReceiver,
true);
}
V8_NOINLINE void InstallToStringTag(Isolate* isolate, Handle<JSObject> holder,
Handle<String> value) {
JSObject::AddProperty(isolate, holder,
isolate->factory()->to_string_tag_symbol(), value,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
}
void InstallToStringTag(Isolate* isolate, Handle<JSObject> holder,
const char* value) {
InstallToStringTag(isolate, holder,
isolate->factory()->InternalizeUtf8String(value));
}
} // namespace
Handle<JSFunction> Genesis::CreateEmptyFunction() {
// 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<JSFunction> empty_function =
CreateFunctionForBuiltin(isolate(), factory()->empty_string(),
empty_function_map, Builtin::kEmptyFunction);
native_context()->set_empty_function(*empty_function);
// --- E m p t y ---
Handle<String> source = factory()->NewStringFromStaticChars("() {}");
Handle<Script> script = factory()->NewScript(source);
script->set_type(Script::TYPE_NATIVE);
Handle<WeakFixedArray> infos = factory()->NewWeakFixedArray(2);
script->set_shared_function_infos(*infos);
empty_function->shared().set_raw_scope_info(
ReadOnlyRoots(isolate()).empty_function_scope_info());
empty_function->shared().DontAdaptArguments();
empty_function->shared().SetScript(ReadOnlyRoots(isolate()), *script, 1);
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<JSFunction> function = CreateFunctionForBuiltinWithoutPrototype(
isolate(), name, Builtin::kStrictPoisonPillThrower);
function->shared().DontAdaptArguments();
// %ThrowTypeError% must have a name property with an empty string value. Per
// spec, ThrowTypeError's name is non-configurable, unlike ordinary functions'
// name property. To redefine it to be non-configurable, use
// SetOwnPropertyIgnoreAttributes.
JSObject::SetOwnPropertyIgnoreAttributes(
function, factory()->name_string(), factory()->empty_string(),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY))
.Assert();
// length needs to be non configurable.
Handle<Object> value(Smi::FromInt(function->length()), isolate());
JSObject::SetOwnPropertyIgnoreAttributes(
function, factory()->length_string(), value,
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY))
.Assert();
if (JSObject::PreventExtensions(isolate_, function, kThrowOnError)
.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);
//
// 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);
//
// 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 inobject_properties = JSObject::kInitialGlobalObjectUnusedPropertiesCount;
int instance_size = JSObject::kHeaderSize + kTaggedSize * inobject_properties;
Handle<JSFunction> object_fun = CreateFunction(
isolate_, factory->Object_string(), JS_OBJECT_TYPE, instance_size,
inobject_properties, factory->null_value(), Builtin::kObjectConstructor);
object_fun->shared().set_length(1);
object_fun->shared().DontAdaptArguments();
native_context()->set_object_function(*object_fun);
{
// Finish setting up Object function's initial map.
Map initial_map = object_fun->initial_map();
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(
isolate(), handle(object_function_prototype->map(), isolate()),
"EmptyObjectPrototype");
map->set_is_prototype_map(true);
// Ban re-setting Object.prototype.__proto__ to prevent Proxy security bug
map->set_is_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(isolate(), empty_function_map, object_function_prototype);
}
native_context()->set_initial_object_prototype(*object_function_prototype);
JSFunction::SetPrototype(object_fun, object_function_prototype);
object_function_prototype->map().set_instance_type(JS_OBJECT_PROTOTYPE_TYPE);
{
// Set up slow map for Object.create(null) instances without in-object
// properties.
Handle<Map> map(object_fun->initial_map(), isolate_);
map = Map::CopyInitialMapNormalized(isolate(), map);
Map::SetPrototype(isolate(), 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(isolate(), map, "slow_object_with_object_prototype_map");
Map::SetPrototype(isolate(), map, object_function_prototype);
native_context()->set_slow_object_with_object_prototype_map(*map);
}
}
namespace {
Handle<Map> CreateNonConstructorMap(Isolate* isolate, Handle<Map> source_map,
Handle<JSObject> prototype,
const char* reason) {
Handle<Map> map = Map::Copy(isolate, source_map, reason);
// Ensure the resulting map has prototype slot (it is necessary for storing
// inital map even when the prototype property is not required).
if (!map->has_prototype_slot()) {
// Re-set the unused property fields after changing the instance size.
int unused_property_fields = map->UnusedPropertyFields();
map->set_instance_size(map->instance_size() + kTaggedSize);
// The prototype slot shifts the in-object properties area by one slot.
map->SetInObjectPropertiesStartInWords(
map->GetInObjectPropertiesStartInWords() + 1);
map->set_has_prototype_slot(true);
map->SetInObjectUnusedPropertyFields(unused_property_fields);
}
map->set_is_constructor(false);
Map::SetPrototype(isolate, map, prototype);
return map;
}
} // namespace
Handle<JSFunction> SimpleInstallFunction(Isolate* isolate,
Handle<JSObject> base,
const char* name, Builtin call,
int len, bool adapt,
PropertyAttributes attrs) {
// Although function name does not have to be internalized the property name
// will be internalized during property addition anyway, so do it here now.
Handle<String> internalized_name =
isolate->factory()->InternalizeUtf8String(name);
Handle<JSFunction> fun =
SimpleCreateFunction(isolate, internalized_name, call, len, adapt);
JSObject::AddProperty(isolate, base, internalized_name, fun, attrs);
return fun;
}
void Genesis::CreateIteratorMaps(Handle<JSFunction> empty) {
// Create iterator-related meta-objects.
Handle<JSObject> iterator_prototype = factory()->NewJSObject(
isolate()->object_function(), AllocationType::kOld);
InstallFunctionAtSymbol(isolate(), iterator_prototype,
factory()->iterator_symbol(), "[Symbol.iterator]",
Builtin::kReturnReceiver, 0, true);
native_context()->set_initial_iterator_prototype(*iterator_prototype);
CHECK_NE(iterator_prototype->map().ptr(),
isolate_->initial_object_prototype()->map().ptr());
iterator_prototype->map().set_instance_type(JS_ITERATOR_PROTOTYPE_TYPE);
Handle<JSObject> generator_object_prototype = factory()->NewJSObject(
isolate()->object_function(), AllocationType::kOld);
native_context()->set_initial_generator_prototype(
*generator_object_prototype);
JSObject::ForceSetPrototype(isolate(), generator_object_prototype,
iterator_prototype);
Handle<JSObject> generator_function_prototype = factory()->NewJSObject(
isolate()->object_function(), AllocationType::kOld);
JSObject::ForceSetPrototype(isolate(), generator_function_prototype, empty);
InstallToStringTag(isolate(), generator_function_prototype,
"GeneratorFunction");
JSObject::AddProperty(isolate(), generator_function_prototype,
factory()->prototype_string(),
generator_object_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
JSObject::AddProperty(isolate(), generator_object_prototype,
factory()->constructor_string(),
generator_function_prototype,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
InstallToStringTag(isolate(), generator_object_prototype, "Generator");
SimpleInstallFunction(isolate(), generator_object_prototype, "next",
Builtin::kGeneratorPrototypeNext, 1, false);
SimpleInstallFunction(isolate(), generator_object_prototype, "return",
Builtin::kGeneratorPrototypeReturn, 1, false);
SimpleInstallFunction(isolate(), generator_object_prototype, "throw",
Builtin::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(),
Builtin::kGeneratorPrototypeNext, 1, false);
generator_next_internal->shared().set_native(false);
native_context()->set_generator_next_internal(*generator_next_internal);
// Internal version of async module functions, flagged as non-native such
// that they don't show up in Error traces.
{
Handle<JSFunction> async_module_evaluate_internal =
SimpleCreateFunction(isolate(), factory()->next_string(),
Builtin::kAsyncModuleEvaluate, 1, false);