// 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/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/isolate-inl.h"
#include "src/natives.h"
#include "src/snapshot.h"
#include "third_party/fdlibm/fdlibm.h"
namespace v8 {
namespace internal {
NativesExternalStringResource::NativesExternalStringResource(
Bootstrapper* bootstrapper,
const char* source,
size_t length)
: data_(source), length_(length) {
if (bootstrapper->delete_these_non_arrays_on_tear_down_ == NULL) {
bootstrapper->delete_these_non_arrays_on_tear_down_ = new List<char*>(2);
}
// The resources are small objects and we only make a fixed number of
// them, but let's clean them up on exit for neatness.
bootstrapper->delete_these_non_arrays_on_tear_down_->
Add(reinterpret_cast<char*>(this));
}
Bootstrapper::Bootstrapper(Isolate* isolate)
: isolate_(isolate),
nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION),
delete_these_non_arrays_on_tear_down_(NULL),
delete_these_arrays_on_tear_down_(NULL) {
}
Handle<String> Bootstrapper::NativesSourceLookup(int index) {
DCHECK(0 <= index && index < Natives::GetBuiltinsCount());
Heap* heap = isolate_->heap();
if (heap->natives_source_cache()->get(index)->IsUndefined()) {
// We can use external strings for the natives.
Vector<const char> source = Natives::GetRawScriptSource(index);
NativesExternalStringResource* resource =
new NativesExternalStringResource(this,
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();
heap->natives_source_cache()->set(index, *source_code);
}
Handle<Object> cached_source(heap->natives_source_cache()->get(index),
isolate_);
return Handle<String>::cast(cached_source);
}
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;
}
char* Bootstrapper::AllocateAutoDeletedArray(int bytes) {
char* memory = new char[bytes];
if (memory != NULL) {
if (delete_these_arrays_on_tear_down_ == NULL) {
delete_these_arrays_on_tear_down_ = new List<char*>(2);
}
delete_these_arrays_on_tear_down_->Add(memory);
}
return memory;
}
void Bootstrapper::TearDown() {
if (delete_these_non_arrays_on_tear_down_ != NULL) {
int len = delete_these_non_arrays_on_tear_down_->length();
DCHECK(len < 28); // Don't use this mechanism for unbounded allocations.
for (int i = 0; i < len; i++) {
delete delete_these_non_arrays_on_tear_down_->at(i);
delete_these_non_arrays_on_tear_down_->at(i) = NULL;
}
delete delete_these_non_arrays_on_tear_down_;
delete_these_non_arrays_on_tear_down_ = NULL;
}
if (delete_these_arrays_on_tear_down_ != NULL) {
int len = delete_these_arrays_on_tear_down_->length();
DCHECK(len < 1000); // Don't use this mechanism for unbounded allocations.
for (int i = 0; i < len; i++) {
delete[] delete_these_arrays_on_tear_down_->at(i);
delete_these_arrays_on_tear_down_->at(i) = NULL;
}
delete delete_these_arrays_on_tear_down_;
delete_these_arrays_on_tear_down_ = NULL;
}
extensions_cache_.Initialize(isolate_, false); // Yes, symmetrical
}
class Genesis BASE_EMBEDDED {
public:
Genesis(Isolate* isolate,
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Handle<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions);
~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> GetStrictPoisonFunction();
// Poison for sloppy generator function arguments/callee.
Handle<JSFunction> GetGeneratorPoisonFunction();
void CreateStrictModeFunctionMaps(Handle<JSFunction> empty);
// Make the "arguments" and "caller" properties throw a TypeError on access.
void PoisonArgumentsAndCaller(Handle<Map> map);
// Creates the global objects using the global 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<JSGlobalProxy> CreateNewGlobals(
v8::Handle<v8::ObjectTemplate> global_proxy_template,
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
Handle<GlobalObject>* global_object_out);
// 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<GlobalObject> 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<GlobalObject> global_object);
// New context initialization. Used for creating a context from scratch.
void InitializeGlobal(Handle<GlobalObject> global_object,
Handle<JSFunction> empty_function);
void InitializeExperimentalGlobal();
// Installs the contents of the native .js files on the global objects.
// Used for creating a context from scratch.
void InstallNativeFunctions();
void InstallExperimentalNativeFunctions();
Handle<JSFunction> InstallInternalArray(Handle<JSBuiltinsObject> builtins,
const char* name,
ElementsKind elements_kind);
bool InstallNatives();
void InstallTypedArray(
const char* name,
ElementsKind elements_kind,
Handle<JSFunction>* fun,
Handle<Map>* external_map);
bool InstallExperimentalNatives();
void InstallBuiltinFunctionIds();
void InstallJSFunctionResultCaches();
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 InstallJSBuiltins(Handle<JSBuiltinsObject> builtins);
bool ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template);
bool ConfigureGlobalObjects(
v8::Handle<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> CreateFunctionMap(FunctionMode function_mode);
void SetFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode);
void MakeFunctionInstancePrototypeWritable();
Handle<Map> CreateStrictFunctionMap(
FunctionMode function_mode,
Handle<JSFunction> empty_function);
void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode);
static bool CompileBuiltin(Isolate* isolate, int index);
static bool CompileExperimentalBuiltin(Isolate* isolate, int index);
static bool CompileNative(Isolate* isolate,
Vector<const char> name,
Handle<String> source);
static bool CompileScriptCached(Isolate* isolate,
Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context);
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> generator_poison_function;
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::Handle<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions) {
HandleScope scope(isolate_);
Genesis genesis(
isolate_, maybe_global_proxy, global_proxy_template, extensions);
Handle<Context> env = genesis.result();
if (env.is_null() || !InstallExtensions(env, extensions)) {
return Handle<Context>();
}
return scope.CloseAndEscape(env);
}
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);
new_map->set_prototype(*proto);
JSObject::MigrateToMap(object, new_map);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
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()->set_constructor(*factory->null_value());
}
static Handle<JSFunction> InstallFunction(Handle<JSObject> target,
const char* name,
InstanceType type,
int instance_size,
MaybeHandle<JSObject> maybe_prototype,
Builtins::Name call) {
Isolate* isolate = target->GetIsolate();
Factory* factory = isolate->factory();
Handle<String> internalized_name = factory->InternalizeUtf8String(name);
Handle<Code> call_code = Handle<Code>(isolate->builtins()->builtin(call));
Handle<JSObject> prototype;
Handle<JSFunction> function = maybe_prototype.ToHandle(&prototype)
? factory->NewFunction(internalized_name, call_code, prototype,
type, instance_size)
: factory->NewFunctionWithoutPrototype(internalized_name, call_code);
PropertyAttributes attributes;
if (target->IsJSBuiltinsObject()) {
attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
} else {
attributes = DONT_ENUM;
}
JSObject::AddProperty(target, internalized_name, function, attributes);
if (target->IsJSGlobalObject()) {
function->shared()->set_instance_class_name(*internalized_name);
}
function->shared()->set_native(true);
return function;
}
void Genesis::SetFunctionInstanceDescriptor(
Handle<Map> map, FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
Map::EnsureDescriptorSlack(map, size);
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), attribs);
{ // Add length.
CallbacksDescriptor d(Handle<Name>(Name::cast(length->name())),
length, attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), attribs);
{ // Add name.
CallbacksDescriptor d(Handle<Name>(Name::cast(name->name())),
name, attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> args =
Accessors::FunctionArgumentsInfo(isolate(), attribs);
{ // Add arguments.
CallbacksDescriptor d(Handle<Name>(Name::cast(args->name())),
args, attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> caller =
Accessors::FunctionCallerInfo(isolate(), attribs);
{ // Add caller.
CallbacksDescriptor d(Handle<Name>(Name::cast(caller->name())),
caller, attribs);
map->AppendDescriptor(&d);
}
if (IsFunctionModeWithPrototype(function_mode)) {
if (function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE) {
attribs = static_cast<PropertyAttributes>(attribs & ~READ_ONLY);
}
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), attribs);
CallbacksDescriptor d(Handle<Name>(Name::cast(prototype->name())),
prototype, attribs);
map->AppendDescriptor(&d);
}
}
Handle<Map> Genesis::CreateFunctionMap(FunctionMode function_mode) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetFunctionInstanceDescriptor(map, function_mode);
map->set_function_with_prototype(IsFunctionModeWithPrototype(function_mode));
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 =
CreateFunctionMap(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 =
CreateFunctionMap(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_ =
CreateFunctionMap(FUNCTION_WITH_WRITEABLE_PROTOTYPE);
Factory* factory = isolate->factory();
Handle<String> object_name = factory->Object_string();
{ // --- 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->set_inobject_properties(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.
Handle<JSObject> prototype = factory->NewJSObject(
isolate->object_function(),
TENURED);
Handle<Map> map = Map::Copy(handle(prototype->map()));
map->set_is_prototype_map(true);
prototype->set_map(*map);
native_context()->set_initial_object_prototype(*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(*prototype);
Accessors::FunctionSetPrototype(object_fun, prototype);
}
// Allocate the empty function as the prototype for function ECMAScript
// 262 15.3.4.
Handle<String> empty_string =
factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("Empty"));
Handle<Code> code(isolate->builtins()->builtin(Builtins::kEmptyFunction));
Handle<JSFunction> empty_function = factory->NewFunctionWithoutPrototype(
empty_string, code);
// Allocate the function map first and then patch the prototype later
Handle<Map> empty_function_map =
CreateFunctionMap(FUNCTION_WITHOUT_PROTOTYPE);
DCHECK(!empty_function_map->is_dictionary_map());
empty_function_map->set_prototype(
native_context()->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(Smi::FromInt(Script::TYPE_NATIVE));
empty_function->shared()->set_script(*script);
empty_function->shared()->set_start_position(0);
empty_function->shared()->set_end_position(source->length());
empty_function->shared()->DontAdaptArguments();
// Set prototypes for the function maps.
native_context()->sloppy_function_map()->set_prototype(*empty_function);
native_context()->sloppy_function_without_prototype_map()->
set_prototype(*empty_function);
sloppy_function_map_writable_prototype_->set_prototype(*empty_function);
return empty_function;
}
void Genesis::SetStrictFunctionInstanceDescriptor(
Handle<Map> map, FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
Map::EnsureDescriptorSlack(map, size);
Handle<AccessorPair> arguments(factory()->NewAccessorPair());
Handle<AccessorPair> caller(factory()->NewAccessorPair());
PropertyAttributes rw_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
// Add length.
if (function_mode == BOUND_FUNCTION) {
Handle<String> length_string = isolate()->factory()->length_string();
FieldDescriptor d(length_string, 0, ro_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);
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), ro_attribs);
CallbacksDescriptor d(Handle<Name>(Name::cast(length->name())),
length, ro_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), ro_attribs);
{ // Add name.
CallbacksDescriptor d(Handle<Name>(Name::cast(name->name())),
name, ro_attribs);
map->AppendDescriptor(&d);
}
{ // Add arguments.
CallbacksDescriptor d(factory()->arguments_string(), arguments,
rw_attribs);
map->AppendDescriptor(&d);
}
{ // Add caller.
CallbacksDescriptor d(factory()->caller_string(), caller, rw_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);
CallbacksDescriptor d(Handle<Name>(Name::cast(prototype->name())),
prototype, attribs);
map->AppendDescriptor(&d);
}
}
// ECMAScript 5th Edition, 13.2.3
Handle<JSFunction> Genesis::GetStrictPoisonFunction() {
if (strict_poison_function.is_null()) {
Handle<String> name = factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("ThrowTypeError"));
Handle<Code> code(isolate()->builtins()->builtin(
Builtins::kStrictModePoisonPill));
strict_poison_function = factory()->NewFunctionWithoutPrototype(name, code);
strict_poison_function->set_map(native_context()->sloppy_function_map());
strict_poison_function->shared()->DontAdaptArguments();
JSObject::PreventExtensions(strict_poison_function).Assert();
}
return strict_poison_function;
}
Handle<JSFunction> Genesis::GetGeneratorPoisonFunction() {
if (generator_poison_function.is_null()) {
Handle<String> name = factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("ThrowTypeError"));
Handle<Code> code(isolate()->builtins()->builtin(
Builtins::kGeneratorPoisonPill));
generator_poison_function = factory()->NewFunctionWithoutPrototype(
name, code);
generator_poison_function->set_map(native_context()->sloppy_function_map());
generator_poison_function->shared()->DontAdaptArguments();
JSObject::PreventExtensions(generator_poison_function).Assert();
}
return generator_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_function_with_prototype(IsFunctionModeWithPrototype(function_mode));
map->set_prototype(*empty_function);
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 bound functions.
Handle<Map> bound_function_map =
CreateStrictFunctionMap(BOUND_FUNCTION, empty);
native_context()->set_bound_function_map(*bound_function_map);
// Complete the callbacks.
PoisonArgumentsAndCaller(strict_function_without_prototype_map);
PoisonArgumentsAndCaller(strict_function_map);
PoisonArgumentsAndCaller(strict_function_map_writable_prototype_);
PoisonArgumentsAndCaller(bound_function_map);
}
static void SetAccessors(Handle<Map> map,
Handle<String> name,
Handle<JSFunction> func) {
DescriptorArray* descs = map->instance_descriptors();
int number = descs->SearchWithCache(*name, *map);
AccessorPair* accessors = AccessorPair::cast(descs->GetValue(number));
accessors->set_getter(*func);
accessors->set_setter(*func);
}
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);
CallbacksDescriptor descriptor(name, accessor_pair, attributes);
descriptors->Replace(idx, &descriptor);
}
void Genesis::PoisonArgumentsAndCaller(Handle<Map> map) {
SetAccessors(map, factory()->arguments_string(), GetStrictPoisonFunction());
SetAccessors(map, factory()->caller_string(), GetStrictPoisonFunction());
}
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());
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());
}
}
Handle<JSGlobalProxy> Genesis::CreateNewGlobals(
v8::Handle<v8::ObjectTemplate> global_proxy_template,
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
Handle<GlobalObject>* global_object_out) {
// 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 create or reinitialize 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 =
factory()->CreateApiFunction(js_global_object_constructor,
factory()->the_hole_value(),
factory()->GlobalObjectType);
}
js_global_object_function->initial_map()->set_is_hidden_prototype();
js_global_object_function->initial_map()->set_dictionary_map(true);
Handle<GlobalObject> global_object =
factory()->NewGlobalObject(js_global_object_function);
if (global_object_out != NULL) {
*global_object_out = global_object;
}
// Step 2: create or 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 =
factory()->CreateApiFunction(global_constructor,
factory()->the_hole_value(),
factory()->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.
Handle<JSGlobalProxy> global_proxy;
if (maybe_global_proxy.ToHandle(&global_proxy)) {
factory()->ReinitializeJSGlobalProxy(global_proxy, global_proxy_function);
} else {
global_proxy = Handle<JSGlobalProxy>::cast(
factory()->NewJSObject(global_proxy_function, TENURED));
global_proxy->set_hash(heap()->undefined_value());
}
return global_proxy;
}
void Genesis::HookUpGlobalProxy(Handle<GlobalObject> 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_context(*native_context());
global_object->set_global_proxy(*global_proxy);
global_proxy->set_native_context(*native_context());
native_context()->set_global_proxy(*global_proxy);
}
void Genesis::HookUpGlobalObject(Handle<GlobalObject> global_object) {
Handle<GlobalObject> global_object_from_snapshot(
GlobalObject::cast(native_context()->extension()));
Handle<JSBuiltinsObject> builtins_global(native_context()->builtins());
native_context()->set_extension(*global_object);
native_context()->set_global_object(*global_object);
native_context()->set_security_token(*global_object);
static const PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
Runtime::DefineObjectProperty(builtins_global, factory()->global_string(),
global_object, attributes).Assert();
// Set up the reference from the global object to the builtins object.
JSGlobalObject::cast(*global_object)->set_builtins(*builtins_global);
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<GlobalObject> global_object,
Handle<JSFunction> empty_function) {
// --- 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();
Heap* heap = isolate->heap();
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
InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
empty_function, Builtins::kIllegal);
{ // --- 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.
CallbacksDescriptor d(
Handle<Name>(Name::cast(array_length->name())),
array_length, attribs);
array_function->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);
}
{ // --- 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::kIllegal);
string_fun->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kStringConstructCode));
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.
CallbacksDescriptor 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::kIllegal);
native_context()->set_symbol_function(*symbol_fun);
}
{ // --- D a t e ---
// Builtin functions for Date.prototype.
Handle<JSFunction> date_fun =
InstallFunction(global, "Date", JS_DATE_TYPE, JSDate::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal);
native_context()->set_date_function(*date_fun);
}
{ // -- 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->inobject_properties());
PropertyAttributes final =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Map::EnsureDescriptorSlack(initial_map, 5);
{
// ECMA-262, section 15.10.7.1.
FieldDescriptor field(factory->source_string(),
JSRegExp::kSourceFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
}
{
// ECMA-262, section 15.10.7.2.
FieldDescriptor field(factory->global_string(),
JSRegExp::kGlobalFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
}
{
// ECMA-262, section 15.10.7.3.
FieldDescriptor field(factory->ignore_case_string(),
JSRegExp::kIgnoreCaseFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
}
{
// ECMA-262, section 15.10.7.4.
FieldDescriptor field(factory->multiline_string(),
JSRegExp::kMultilineFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
}
{
// ECMA-262, section 15.10.7.5.
PropertyAttributes writable =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
FieldDescriptor field(factory->last_index_string(),
JSRegExp::kLastIndexFieldIndex,
writable,
Representation::Tagged());
initial_map->AppendDescriptor(&field);
}
initial_map->set_inobject_properties(5);
initial_map->set_pre_allocated_property_fields(5);
initial_map->set_unused_property_fields(0);
initial_map->set_instance_size(
initial_map->instance_size() + 5 * kPointerSize);
initial_map->set_visitor_id(StaticVisitorBase::GetVisitorId(*initial_map));
// RegExp prototype object is itself a RegExp.
Handle<Map> proto_map = Map::Copy(initial_map);
proto_map->set_prototype(native_context()->initial_object_prototype());
Handle<JSObject> proto = factory->NewJSObjectFromMap(proto_map);
proto->InObjectPropertyAtPut(JSRegExp::kSourceFieldIndex,
heap->query_colon_string());
proto->InObjectPropertyAtPut(JSRegExp::kGlobalFieldIndex,
heap->false_value());
proto->InObjectPropertyAtPut(JSRegExp::kIgnoreCaseFieldIndex,
heap->false_value());
proto->InObjectPropertyAtPut(JSRegExp::kMultilineFieldIndex,
heap->false_value());
proto->InObjectPropertyAtPut(JSRegExp::kLastIndexFieldIndex,
Smi::FromInt(0),
SKIP_WRITE_BARRIER); // It's a Smi.
proto_map->set_is_prototype_map(true);
initial_map->set_prototype(*proto);
factory->SetRegExpIrregexpData(Handle<JSRegExp>::cast(proto),
JSRegExp::IRREGEXP, factory->empty_string(),
JSRegExp::Flags(0), 0);
}
{ // -- 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->SetInstanceClassName(*name);
Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
DCHECK(json_object->IsJSObject());
JSObject::AddProperty(global, name, json_object, DONT_ENUM);
native_context()->set_json_object(*json_object);
}
{ // -- 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; \
Handle<Map> external_map; \
InstallTypedArray(#Type "Array", \
TYPE##_ELEMENTS, \
&fun, \
&external_map); \
native_context()->set_##type##_array_fun(*fun); \
native_context()->set_##type##_array_external_map(*external_map); \
}
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
InstallFunction(global, "Map", JS_MAP_TYPE, JSMap::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
// -- S e t
InstallFunction(global, "Set", JS_SET_TYPE, JSSet::kSize,
isolate->initial_object_prototype(), Builtins::kIllegal);
{ // Set up the iterator result object
STATIC_ASSERT(JSGeneratorObject::kResultPropertyCount == 2);
Handle<JSFunction> object_function(native_context()->object_function());
Handle<Map> iterator_result_map =
Map::Create(isolate, JSGeneratorObject::kResultPropertyCount);
DCHECK_EQ(JSGeneratorObject::kResultSize,
iterator_result_map->instance_size());
DCHECK_EQ(JSGeneratorObject::kResultPropertyCount,
iterator_result_map->inobject_properties());
Map::EnsureDescriptorSlack(iterator_result_map,
JSGeneratorObject::kResultPropertyCount);
FieldDescriptor value_descr(factory->value_string(),
JSGeneratorObject::kResultValuePropertyIndex,
NONE, Representation::Tagged());
iterator_result_map->AppendDescriptor(&value_descr);
FieldDescriptor done_descr(factory->done_string(),
JSGeneratorObject::kResultDonePropertyIndex,
NONE, Representation::Tagged());
iterator_result_map->AppendDescriptor(&done_descr);
iterator_result_map->set_unused_property_fields(0);
iterator_result_map->set_pre_allocated_property_fields(
JSGeneratorObject::kResultPropertyCount);
DCHECK_EQ(JSGeneratorObject::kResultSize,
iterator_result_map->instance_size());
native_context()->set_iterator_result_map(*iterator_result_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);
// Create the descriptor array for the arguments object.
Map::EnsureDescriptorSlack(map, 2);
{ // length
FieldDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // callee
FieldDescriptor d(factory->callee_string(), Heap::kArgumentsCalleeIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
// @@iterator method is added later.
map->set_function_with_prototype(true);
map->set_pre_allocated_property_fields(2);
map->set_inobject_properties(2);
native_context()->set_sloppy_arguments_map(*map);
DCHECK(!function->has_initial_map());
JSFunction::SetInitialMap(function, map,
isolate->initial_object_prototype());
DCHECK(map->inobject_properties() > Heap::kArgumentsCalleeIndex);
DCHECK(map->inobject_properties() > Heap::kArgumentsLengthIndex);
DCHECK(!map->is_dictionary_map());
DCHECK(IsFastObjectElementsKind(map->elements_kind()));
}
{ // --- aliased arguments map
Handle<Map> map = Map::Copy(isolate->sloppy_arguments_map());
map->set_elements_kind(SLOPPY_ARGUMENTS_ELEMENTS);
DCHECK_EQ(2, map->pre_allocated_property_fields());
native_context()->set_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 = GetStrictPoisonFunction();
// 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);
// Create the descriptor array for the arguments object.
Map::EnsureDescriptorSlack(map, 3);
{ // length
FieldDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
DONT_ENUM, Representation::Tagged());
map->AppendDescriptor(&d);
}
{ // callee
CallbacksDescriptor d(factory->callee_string(), callee, attributes);
map->AppendDescriptor(&d);
}
{ // caller
CallbacksDescriptor d(factory->caller_string(), caller, attributes);
map->AppendDescriptor(&d);
}
// @@iterator method is added later.
map->set_function_with_prototype(true);
map->set_prototype(native_context()->object_function()->prototype());
map->set_pre_allocated_property_fields(1);
map->set_inobject_properties(1);
// Copy constructor from the sloppy arguments boilerplate.
map->set_constructor(
native_context()->sloppy_arguments_map()->constructor());
native_context()->set_strict_arguments_map(*map);
DCHECK(map->inobject_properties() > 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();
}
// Initialize the embedder data slot.
Handle<FixedArray> embedder_data = factory->NewFixedArray(3);
native_context()->set_embedder_data(*embedder_data);
}
void Genesis::InstallTypedArray(
const char* name,
ElementsKind elements_kind,
Handle<JSFunction>* fun,
Handle<Map>* external_map) {
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;
ElementsKind external_kind = GetNextTransitionElementsKind(elements_kind);
*external_map = Map::AsElementsKind(initial_map, external_kind);
}
void Genesis::InitializeExperimentalGlobal() {
// TODO(erikcorry): Move this into Genesis::InitializeGlobal once we no
// longer need to live behind a flag.
Handle<JSObject> builtins(native_context()->builtins());
Handle<HeapObject> flag(
FLAG_harmony_regexps ? heap()->true_value() : heap()->false_value());
PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
Runtime::DefineObjectProperty(builtins, factory()->harmony_regexps_string(),
flag, attributes).Assert();
}
bool Genesis::CompileBuiltin(Isolate* isolate, int index) {
Vector<const char> name = Natives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->NativesSourceLookup(index);
return CompileNative(isolate, name, source_code);
}
bool Genesis::CompileExperimentalBuiltin(Isolate* isolate, int index) {
Vector<const char> name = ExperimentalNatives::GetScriptName(index);
Factory* factory = isolate->factory();
Handle<String> source_code;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, source_code, factory->NewStringFromAscii(
ExperimentalNatives::GetRawScriptSource(index)),
false);
return CompileNative(isolate, name, source_code);
}
bool Genesis::CompileNative(Isolate* isolate,
Vector<const char> name,
Handle<String> source) {
HandleScope scope(isolate);
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.HasOverflowed()) return false;
bool result = CompileScriptCached(isolate,
name,
source,
NULL,
NULL,
Handle<Context>(isolate->context()),
true);
DCHECK(isolate->has_pending_exception() != result);
if (!result) isolate->clear_pending_exception();
return result;
}
bool Genesis::CompileScriptCached(Isolate* isolate,
Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context) {
Factory* factory = isolate->factory();
HandleScope scope(isolate);
Handle<SharedFunctionInfo> function_info;
// If we can't find the function in the cache, we compile a new
// function and insert it into the cache.
if (cache == NULL || !cache->Lookup(name, &function_info)) {
DCHECK(source->IsOneByteRepresentation());
Handle<String> script_name =
factory->NewStringFromUtf8(name).ToHandleChecked();
function_info = Compiler::CompileScript(
source, script_name, 0, 0, false, top_context, extension, NULL,
ScriptCompiler::kNoCompileOptions,
use_runtime_context ? NATIVES_CODE : NOT_NATIVES_CODE);
if (function_info.is_null()) return false;
if (cache != NULL) 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.
DCHECK(top_context->IsNativeContext());
Handle<Context> context =
Handle<Context>(use_runtime_context
? Handle<Context>(top_context->runtime_context())
: top_context);
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 =
Handle<Object>(use_runtime_context
? top_context->builtins()
: top_context->global_object(),
isolate);
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<GlobalObject> 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_EQ(NULL, 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);
}
#define INSTALL_NATIVE(Type, name, var) \
Handle<String> var##_name = \
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR(name)); \
Handle<Object> var##_native = \
Object::GetProperty(handle(native_context()->builtins()), var##_name) \
.ToHandleChecked(); \
native_context()->set_##var(Type::cast(*var##_native));
#define INSTALL_NATIVE_MATH(name) \
{ \
Handle<Object> fun = \
ResolveBuiltinIdHolder(native_context(), "Math." #name); \
native_context()->set_math_##name##_fun(JSFunction::cast(*fun)); \
}
void Genesis::InstallNativeFunctions() {
HandleScope scope(isolate());
INSTALL_NATIVE(JSFunction, "CreateDate", create_date_fun);
INSTALL_NATIVE(JSFunction, "ToNumber", to_number_fun);
INSTALL_NATIVE(JSFunction, "ToString", to_string_fun);
INSTALL_NATIVE(JSFunction, "ToDetailString", to_detail_string_fun);
INSTALL_NATIVE(JSFunction, "ToObject", to_object_fun);
INSTALL_NATIVE(JSFunction, "ToInteger", to_integer_fun);
INSTALL_NATIVE(JSFunction, "ToUint32", to_uint32_fun);
INSTALL_NATIVE(JSFunction, "ToInt32", to_int32_fun);
INSTALL_NATIVE(JSFunction, "GlobalEval", global_eval_fun);
INSTALL_NATIVE(JSFunction, "Instantiate", instantiate_fun);
INSTALL_NATIVE(JSFunction, "ConfigureTemplateInstance",
configure_instance_fun);
INSTALL_NATIVE(JSFunction, "GetStackTraceLine", get_stack_trace_line_fun);
INSTALL_NATIVE(JSObject, "functionCache", function_cache);
INSTALL_NATIVE(JSFunction, "ToCompletePropertyDescriptor",
to_complete_property_descriptor);
INSTALL_NATIVE(JSFunction, "IsPromise", is_promise);
INSTALL_NATIVE(JSFunction, "PromiseCreate", promise_create);
INSTALL_NATIVE(JSFunction, "PromiseResolve", promise_resolve);
INSTALL_NATIVE(JSFunction, "PromiseReject", promise_reject);
INSTALL_NATIVE(JSFunction, "PromiseChain", promise_chain);
INSTALL_NATIVE(JSFunction, "PromiseCatch", promise_catch);
INSTALL_NATIVE(JSFunction, "PromiseThen", promise_then);
INSTALL_NATIVE(JSFunction, "NotifyChange", observers_notify_change);
INSTALL_NATIVE(JSFunction, "EnqueueSpliceRecord", observers_enqueue_splice);
INSTALL_NATIVE(JSFunction, "BeginPerformSplice",
observers_begin_perform_splice);
INSTALL_NATIVE(JSFunction, "EndPerformSplice",
observers_end_perform_splice);
INSTALL_NATIVE(JSFunction, "NativeObjectObserve",
native_object_observe);
INSTALL_NATIVE(JSFunction, "NativeObjectGetNotifier",
native_object_get_notifier);
INSTALL_NATIVE(JSFunction, "NativeObjectNotifierPerformChange",
native_object_notifier_perform_change);
INSTALL_NATIVE(Symbol, "symbolIterator", iterator_symbol);
INSTALL_NATIVE(Symbol, "symbolUnscopables", unscopables_symbol);
INSTALL_NATIVE(JSFunction, "ArrayValues", array_values_iterator);
INSTALL_NATIVE_MATH(abs)
INSTALL_NATIVE_MATH(acos)
INSTALL_NATIVE_MATH(asin)
INSTALL_NATIVE_MATH(atan)
INSTALL_NATIVE_MATH(atan2)
INSTALL_NATIVE_MATH(ceil)
INSTALL_NATIVE_MATH(cos)
INSTALL_NATIVE_MATH(exp)
INSTALL_NATIVE_MATH(floor)
INSTALL_NATIVE_MATH(imul)
INSTALL_NATIVE_MATH(log)
INSTALL_NATIVE_MATH(max)
INSTALL_NATIVE_MATH(min)
INSTALL_NATIVE_MATH(pow)
INSTALL_NATIVE_MATH(random)
INSTALL_NATIVE_MATH(round)
INSTALL_NATIVE_MATH(sin)
INSTALL_NATIVE_MATH(sqrt)
INSTALL_NATIVE_MATH(tan)
}
void Genesis::InstallExperimentalNativeFunctions() {
if (FLAG_harmony_proxies) {
INSTALL_NATIVE(JSFunction, "DerivedHasTrap", derived_has_trap);
INSTALL_NATIVE(JSFunction, "DerivedGetTrap", derived_get_trap);
INSTALL_NATIVE(JSFunction, "DerivedSetTrap", derived_set_trap);
INSTALL_NATIVE(JSFunction, "ProxyEnumerate", proxy_enumerate);
}
}
#undef INSTALL_NATIVE
Handle<JSFunction> Genesis::InstallInternalArray(
Handle<JSBuiltinsObject> builtins,
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(
builtins, 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);
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.
CallbacksDescriptor d(
Handle<Name>(Name::cast(array_length->name())), array_length, attribs);
array_function->initial_map()->AppendDescriptor(&d);
}
return array_function;
}
bool Genesis::InstallNatives() {
HandleScope scope(isolate());
// Create a function for the builtins object. Allocate space for the
// JavaScript builtins, a reference to the builtins object
// (itself) and a reference to the native_context directly in the object.
Handle<Code> code = Handle<Code>(
isolate()->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> builtins_fun = factory()->NewFunction(
factory()->empty_string(), code, JS_BUILTINS_OBJECT_TYPE,
JSBuiltinsObject::kSize);
Handle<String> name =
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("builtins"));
builtins_fun->shared()->set_instance_class_name(*name);
builtins_fun->initial_map()->set_dictionary_map(true);
builtins_fun->initial_map()->set_prototype(heap()->null_value());
// Allocate the builtins object.
Handle<JSBuiltinsObject> builtins =
Handle<JSBuiltinsObject>::cast(factory()->NewGlobalObject(builtins_fun));
builtins->set_builtins(*builtins);
builtins->set_native_context(*native_context());
builtins->set_global_context(*native_context());
builtins->set_global_proxy(native_context()->global_proxy());
// Set up the 'global' properties of the builtins object. The
// 'global' property that refers to the global object is the only
// way to get from code running in the builtins context to the
// global object.
static const PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
Handle<String> global_string =
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("global"));
Handle<Object> global_obj(native_context()->global_object(), isolate());
JSObject::AddProperty(builtins, global_string, global_obj, attributes);
Handle<String> builtins_string =
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("builtins"));
JSObject::AddProperty(builtins, builtins_string, builtins, attributes);
// Set up the reference from the global object to the builtins object.
JSGlobalObject::cast(native_context()->global_object())->
set_builtins(*builtins);
// 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 builtins context.
Handle<Context> context =
factory()->NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge);
context->set_global_object(*builtins); // override builtins global object
native_context()->set_runtime_context(*context);
{ // -- S c r i p t
// Builtin functions for Script.
Handle<JSFunction> script_fun = InstallFunction(
builtins, "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);
native_context()->set_script_function(*script_fun);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
Map::EnsureDescriptorSlack(script_map, 14);
PropertyAttributes attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<AccessorInfo> script_column =
Accessors::ScriptColumnOffsetInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_column->name())),
script_column, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_id =
Accessors::ScriptIdInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_id->name())),
script_id, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_name =
Accessors::ScriptNameInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_name->name())),
script_name, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_line =
Accessors::ScriptLineOffsetInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_line->name())),
script_line, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_source =
Accessors::ScriptSourceInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_source->name())),
script_source, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_type =
Accessors::ScriptTypeInfo(isolate(), attribs);
{
CallbacksDescriptor d(Handle<Name>(Name::cast(script_type->name())),
script_type, attribs);
script_map->AppendDescriptor(&d);
}
Handle<AccessorInfo> script_compilation_type =
Accessors::ScriptCompilationTypeInfo(isolate(), attribs);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor 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);
{
CallbacksDescriptor d(
Handle<Name>(Name::cast(script_source_mapping_url->name())),
script_source_mapping_url, attribs);
script_map->AppendDescriptor(&d);
}
// Allocate the empty script.
Handle<Script> script = factory()->NewScript(factory()->empty_string());
script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
heap()->public_set_empty_script(*script);
}
{
// 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 = InstallFunction(
builtins, "OpaqueReference", JS_VALUE_TYPE, JSValue::kSize,
isolate()->initial_object_prototype(), Builtins::kIllegal);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Accessors::FunctionSetPrototype(opaque_reference_fun, prototype);
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.
{
Handle<JSFunction> array_function =
InstallInternalArray(builtins, "InternalArray", FAST_HOLEY_ELEMENTS);
native_context()->set_internal_array_function(*array_function);
}
{
InstallInternalArray(builtins, "InternalPackedArray", FAST_ELEMENTS);
}
{ // -- S e t I t e r a t o r
Handle<JSFunction> set_iterator_function = InstallFunction(
builtins, "SetIterator", JS_SET_ITERATOR_TYPE, JSSetIterator::kSize,
isolate()->initial_object_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<JSFunction> map_iterator_function = InstallFunction(
builtins, "MapIterator", JS_MAP_ITERATOR_TYPE, JSMapIterator::kSize,
isolate()->initial_object_prototype(), Builtins::kIllegal);
native_context()->set_map_iterator_map(
map_iterator_function->initial_map());
}
{
// Create generator meta-objects and install them on the builtins object.
Handle<JSObject> builtins(native_context()->builtins());
Handle<JSObject> generator_object_prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
Handle<JSFunction> generator_function_prototype =
InstallFunction(builtins, "GeneratorFunctionPrototype",
JS_FUNCTION_TYPE, JSFunction::kHeaderSize,
generator_object_prototype, Builtins::kIllegal);
InstallFunction(builtins, "GeneratorFunction", JS_FUNCTION_TYPE,
JSFunction::kSize, generator_function_prototype,
Builtins::kIllegal);
// Create maps for generator functions and their prototypes. Store those
// maps in the native context.
Handle<Map> generator_function_map =
Map::Copy(sloppy_function_map_writable_prototype_);
generator_function_map->set_prototype(*generator_function_prototype);
native_context()->set_sloppy_generator_function_map(
*generator_function_map);
// The "arguments" and "caller" instance properties aren't specified, so
// technically we could leave them out. They make even less sense for
// generators than for functions. Still, the same argument that it makes
// sense to keep them around but poisoned in strict mode applies to
// generators as well. With poisoned accessors, naive callers can still
// iterate over the properties without accessing them.
//
// We can't use PoisonArgumentsAndCaller because that mutates accessor pairs
// in place, and the initial state of the generator function map shares the
// accessor pair with sloppy functions. Also the error message should be
// different. Also unhappily, we can't use the API accessors to implement
// poisoning, because API accessors present themselves as data properties,
// not accessor properties, and so getOwnPropertyDescriptor raises an
// exception as it tries to get the values. Sadness.
Handle<AccessorPair> poison_pair(factory()->NewAccessorPair());
PropertyAttributes rw_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
Handle<JSFunction> poison_function = GetGeneratorPoisonFunction();
poison_pair->set_getter(*poison_function);
poison_pair->set_setter(*poison_function);
ReplaceAccessors(generator_function_map, factory()->arguments_string(),
rw_attribs, poison_pair);
ReplaceAccessors(generator_function_map, factory()->caller_string(),
rw_attribs, poison_pair);
Handle<Map> strict_function_map(native_context()->strict_function_map());
Handle<Map> strict_generator_function_map = Map::Copy(strict_function_map);
// "arguments" and "caller" already poisoned.
strict_generator_function_map->set_prototype(*generator_function_prototype);
native_context()->set_strict_generator_function_map(
*strict_generator_function_map);
Handle<JSFunction> object_function(native_context()->object_function());
Handle<Map> generator_object_prototype_map = Map::Create(isolate(), 0);
generator_object_prototype_map->set_prototype(*generator_object_prototype);
native_context()->set_generator_object_prototype_map(
*generator_object_prototype_map);
}
if (FLAG_disable_native_files) {
PrintF("Warning: Running without installed natives!\n");
return true;
}
// Install natives.
for (int i = Natives::GetDebuggerCount();
i < Natives::GetBuiltinsCount();
i++) {
if (!CompileBuiltin(isolate(), i)) return false;
// TODO(ager): We really only need to install the JS builtin
// functions on the builtins object after compiling and running
// runtime.js.
if (!InstallJSBuiltins(builtins)) return false;
}
InstallNativeFunctions();
// Store the map for the string prototype 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 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);
if (FLAG_vector_ics) {
// Apply embeds an IC, so we need a type vector of size 1 in the shared
// function info.
Handle<TypeFeedbackVector> feedback_vector =
factory()->NewTypeFeedbackVector(1);
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_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->set_constructor(*array_constructor);
// Set prototype on map.
initial_map->set_non_instance_prototype(false);
initial_map->set_prototype(*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);
CallbacksDescriptor desc(length,
handle(array_descriptors->GetValue(old),
isolate()),
array_descriptors->GetDetails(old).attributes());
initial_map->AppendDescriptor(&desc);
}
{
FieldDescriptor index_field(factory()->index_string(),
JSRegExpResult::kIndexIndex,
NONE,
Representation::Tagged());
initial_map->AppendDescriptor(&index_field);
}
{
FieldDescriptor input_field(factory()->input_string(),
JSRegExpResult::kInputIndex,
NONE,
Representation::Tagged());
initial_map->AppendDescriptor(&input_field);
}
initial_map->set_inobject_properties(2);
initial_map->set_pre_allocated_property_fields(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);
{
CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
arguments_iterator, attribs);
Handle<Map> map(native_context()->sloppy_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
{
CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
arguments_iterator, attribs);
Handle<Map> map(native_context()->aliased_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
{
CallbacksDescriptor d(Handle<Name>(native_context()->iterator_symbol()),
arguments_iterator, attribs);
Handle<Map> map(native_context()->strict_arguments_map());
Map::EnsureDescriptorSlack(map, 1);
map->AppendDescriptor(&d);
}
}
#ifdef VERIFY_HEAP
builtins->ObjectVerify();
#endif
return true;
}
#define INSTALL_EXPERIMENTAL_NATIVE(i, flag, file) \
if (FLAG_harmony_##flag && \
strcmp(ExperimentalNatives::GetScriptName(i).start(), \
"native " file) == 0) { \
if (!CompileExperimentalBuiltin(isolate(), i)) return false; \
}
bool Genesis::InstallExperimentalNatives() {
for (int i = ExperimentalNatives::GetDebuggerCount();
i < ExperimentalNatives::GetBuiltinsCount();
i++) {
INSTALL_EXPERIMENTAL_NATIVE(i, proxies, "proxy.js")
INSTALL_EXPERIMENTAL_NATIVE(i, strings, "harmony-string.js")
INSTALL_EXPERIMENTAL_NATIVE(i, arrays, "harmony-array.js")
INSTALL_EXPERIMENTAL_NATIVE(i, classes, "harmony-classes.js")
}
InstallExperimentalNativeFunctions();
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));
}
void Genesis::InstallBuiltinFunctionIds() {
HandleScope scope(isolate());
#define INSTALL_BUILTIN_ID(holder_expr, fun_name, name) \
{ \
Handle<JSObject> holder = ResolveBuiltinIdHolder( \
native_context(), #holder_expr); \
BuiltinFunctionId id = k##name; \
InstallBuiltinFunctionId(holder, #fun_name, id); \
}
FUNCTIONS_WITH_ID_LIST(INSTALL_BUILTIN_ID)
#undef INSTALL_BUILTIN_ID
}
// Do not forget to update macros.py with named constant
// of cache id.
#define JSFUNCTION_RESULT_CACHE_LIST(F) \
F(16, native_context()->regexp_function())
static FixedArray* CreateCache(int size, Handle<JSFunction> factory_function) {
Factory* factory = factory_function->GetIsolate()->factory();
// Caches are supposed to live for a long time, allocate in old space.
int array_size = JSFunctionResultCache::kEntriesIndex + 2 * size;
// Cannot use cast as object is not fully initialized yet.
JSFunctionResultCache* cache = reinterpret_cast<JSFunctionResultCache*>(
*factory->NewFixedArrayWithHoles(array_size, TENURED));
cache->set(JSFunctionResultCache::kFactoryIndex, *factory_function);
cache->MakeZeroSize();
return cache;
}
void Genesis::InstallJSFunctionResultCaches() {
const int kNumberOfCaches = 0 +
#define F(size, func) + 1
JSFUNCTION_RESULT_CACHE_LIST(F)
#undef F
;
Handle<FixedArray> caches =
factory()->NewFixedArray(kNumberOfCaches, TENURED);
int index = 0;
#define F(size, func) do { \
FixedArray* cache = CreateCache((size), Handle<JSFunction>(func)); \
caches->set(index++, cache); \
} while (false)
JSFUNCTION_RESULT_CACHE_LIST(F);
#undef F
native_context()->set_jsfunction_result_caches(*caches);
}
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 natives in global if a name for it is specified.
if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) {
Handle<String> natives =
factory->InternalizeUtf8String(FLAG_expose_natives_as);
uint32_t dummy_index;
if (natives->AsArrayIndex(&dummy_index)) return true;
JSObject::AddProperty(global, natives, handle(global->builtins()),
DONT_ENUM);
}
// Expose the stack trace symbol to native JS.
RETURN_ON_EXCEPTION_VALUE(isolate,
JSObject::SetOwnPropertyIgnoreAttributes(
handle(native_context->builtins(), isolate),
factory->InternalizeOneByteString(
STATIC_CHAR_VECTOR("stack_trace_symbol")),
factory->stack_trace_symbol(), NONE),
false);
// 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);
}
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), false);
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_.Lookup(extension, Hash(extension), true)->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.
Handle<String> source_code =
isolate->factory()
->NewExternalStringFromOneByte(extension->source())
.ToHandleChecked();
bool result = CompileScriptCached(isolate,
CStrVector(extension->name()),
source_code,
isolate->bootstrapper()->extensions_cache(),
extension,
Handle<Context>(isolate->context()),
false);
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::InstallJSBuiltins(Handle<JSBuiltinsObject> builtins) {
HandleScope scope(isolate());
for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
Handle<Object> function_object = Object::GetProperty(
isolate(), builtins, Builtins::GetName(id)).ToHandleChecked();
Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
builtins->set_javascript_builtin(id, *function);
// TODO(mstarzinger): This is just a temporary hack to make TurboFan work,
// the correct solution is to restore the context register after invoking
// builtins from full-codegen.
function->shared()->set_optimization_disabled(true);
if (!Compiler::EnsureCompiled(function, CLEAR_EXCEPTION)) {
return false;
}
builtins->set_javascript_builtin_code(id, function->shared()->code());
}
return true;
}
bool Genesis::ConfigureGlobalObjects(
v8::Handle<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()));
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 =
Execution::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 (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 FIELD: {
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 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 CALLBACKS: {
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 = PropertyDetails(
details.attributes(), CALLBACKS, i + 1);
JSObject::SetNormalizedProperty(to, key, callbacks, d);
break;
}
// Do not occur since the from object has fast properties.
case NORMAL:
UNREACHABLE();
break;
}
}
} 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());
if (value->IsPropertyCell()) {
value = Handle<Object>(PropertyCell::cast(*value)->value(),
isolate());
}
PropertyDetails details = properties->DetailsAt(i);
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) {
if (isolate->serializer_enabled()) {
// Disable tracking double fields because heap numbers treated as
// immutable by the serializer.
FLAG_track_double_fields = false;
}
}
~NoTrackDoubleFieldsForSerializerScope() {
FLAG_track_double_fields = flag_;
}
private:
bool flag_;
};
Genesis::Genesis(Isolate* isolate,
MaybeHandle<JSGlobalProxy> maybe_global_proxy,
v8::Handle<v8::ObjectTemplate> global_proxy_template,
v8::ExtensionConfiguration* extensions)
: 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()) return;
// We can only de-serialize a context if the isolate was initialized from
// a snapshot. Otherwise we have to build the context from scratch.
if (isolate->initialized_from_snapshot()) {
native_context_ = Snapshot::NewContextFromSnapshot(isolate);
} else {
native_context_ = Handle<Context>();
}
if (!native_context().is_null()) {
AddToWeakNativeContextList(*native_context());
isolate->set_context(*native_context());
isolate->counters()->contexts_created_by_snapshot()->Increment();
Handle<GlobalObject> global_object;
Handle<JSGlobalProxy> global_proxy = CreateNewGlobals(
global_proxy_template, maybe_global_proxy, &global_object);
HookUpGlobalProxy(global_object, global_proxy);
HookUpGlobalObject(global_object);
native_context()->builtins()->set_global_proxy(
native_context()->global_proxy());
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);
Handle<GlobalObject> global_object;
Handle<JSGlobalProxy> global_proxy = CreateNewGlobals(
global_proxy_template, maybe_global_proxy, &global_object);
HookUpGlobalProxy(global_object, global_proxy);
InitializeGlobal(global_object, empty_function);
InstallJSFunctionResultCaches();
InitializeNormalizedMapCaches();
if (!InstallNatives()) return;
MakeFunctionInstancePrototypeWritable();
if (!ConfigureGlobalObjects(global_proxy_template)) return;
isolate->counters()->contexts_created_from_scratch()->Increment();
}
// Install experimental natives.
if (!InstallExperimentalNatives()) return;
InitializeExperimentalGlobal();
// We can't (de-)serialize typed arrays currently, but we are lucky: The state
// of the random number generator needs no initialization during snapshot
// creation time and we don't need trigonometric functions then.
if (!isolate->serializer_enabled()) {
// Initially seed the per-context random number generator using the
// per-isolate random number generator.
const int num_elems = 2;
const int num_bytes = num_elems * sizeof(uint32_t);
uint32_t* state = reinterpret_cast<uint32_t*>(malloc(num_bytes));
do {
isolate->random_number_generator()->NextBytes(state, num_bytes);
} while (state[0] == 0 || state[1] == 0);
v8::Local<v8::ArrayBuffer> buffer = v8::ArrayBuffer::New(
reinterpret_cast<v8::Isolate*>(isolate), state, num_bytes);
Utils::OpenHandle(*buffer)->set_should_be_freed(true);
v8::Local<v8::Uint32Array> ta = v8::Uint32Array::New(buffer, 0, num_elems);
Handle<JSBuiltinsObject> builtins(native_context()->builtins());
Runtime::DefineObjectProperty(builtins, factory()->InternalizeOneByteString(
STATIC_CHAR_VECTOR("rngstate")),
Utils::OpenHandle(*ta), NONE).Assert();
// Initialize trigonometric lookup tables and constants.
const int constants_size = arraysize(fdlibm::MathConstants::constants);
const int table_num_bytes = constants_size * kDoubleSize;
v8::Local<v8::ArrayBuffer> trig_buffer = v8::ArrayBuffer::New(
reinterpret_cast<v8::Isolate*>(isolate),
const_cast<double*>(fdlibm::MathConstants::constants), table_num_bytes);
v8::Local<v8::Float64Array> trig_table =
v8::Float64Array::New(trig_buffer, 0, constants_size);
Runtime::DefineObjectProperty(
builtins,
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("kMath")),
Utils::OpenHandle(*trig_table), NONE).Assert();
}
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 v8::internal