root/src/bootstrapper.cc
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DEFINITIONS
This source file includes following definitions.
- length_
- delete_these_arrays_on_tear_down_
- NativesSourceLookup
- Initialize
- AllocateAutoDeletedArray
- TearDown
- result
- previous
- isolate
- factory
- heap
- global_context
- Iterate
- CreateEnvironment
- SetObjectPrototype
- DetachGlobal
- ReattachGlobal
- InstallFunction
- ComputeFunctionInstanceDescriptor
- CreateFunctionMap
- CreateEmptyFunction
- ComputeStrictFunctionInstanceDescriptor
- GetThrowTypeErrorFunction
- CreateStrictModeFunctionMap
- CreateStrictModeFunctionMaps
- SetAccessors
- PoisonArgumentsAndCaller
- AddToWeakGlobalContextList
- CreateRoots
- CreateNewGlobals
- HookUpGlobalProxy
- HookUpInnerGlobal
- InitializeGlobal
- InitializeExperimentalGlobal
- CompileBuiltin
- CompileExperimentalBuiltin
- CompileNative
- CompileScriptCached
- InstallNativeFunctions
- InstallExperimentalNativeFunctions
- InstallNatives
- InstallExperimentalNatives
- ResolveBuiltinIdHolder
- InstallBuiltinFunctionId
- InstallBuiltinFunctionIds
- CreateCache
- InstallJSFunctionResultCaches
- InitializeNormalizedMapCaches
- InstallExtensions
- InstallSpecialObjects
- Hash
- MatchRegisteredExtensions
- get_state
- set_state
- InstallExtensions
- InstallExtension
- InstallExtension
- InstallJSBuiltins
- ConfigureGlobalObjects
- ConfigureApiObject
- TransferNamedProperties
- TransferIndexedProperties
- TransferObject
- MakeFunctionInstancePrototypeWritable
- ArchiveSpacePerThread
- ArchiveState
- RestoreState
- FreeThreadResources
// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "accessors.h"
#include "api.h"
#include "bootstrapper.h"
#include "compiler.h"
#include "debug.h"
#include "execution.h"
#include "global-handles.h"
#include "isolate-inl.h"
#include "macro-assembler.h"
#include "natives.h"
#include "objects-visiting.h"
#include "platform.h"
#include "snapshot.h"
#include "extensions/externalize-string-extension.h"
#include "extensions/gc-extension.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()
: 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) {
ASSERT(0 <= index && index < Natives::GetBuiltinsCount());
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
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());
Handle<String> source_code =
factory->NewExternalStringFromAscii(resource);
heap->natives_source_cache()->set(index, *source_code);
}
Handle<Object> cached_source(heap->natives_source_cache()->get(index));
return Handle<String>::cast(cached_source);
}
void Bootstrapper::Initialize(bool create_heap_objects) {
extensions_cache_.Initialize(create_heap_objects);
GCExtension::Register();
ExternalizeStringExtension::Register();
}
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();
ASSERT(len < 20); // 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();
ASSERT(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(false); // Yes, symmetrical
}
class Genesis BASE_EMBEDDED {
public:
Genesis(Isolate* isolate,
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions);
~Genesis() { }
Handle<Context> result() { return result_; }
Genesis* previous() { return previous_; }
Isolate* isolate() const { return isolate_; }
Factory* factory() const { return isolate_->factory(); }
Heap* heap() const { return isolate_->heap(); }
private:
Handle<Context> global_context_;
Isolate* isolate_;
// There may be more than one active genesis object: When GC is
// triggered during environment creation there may be weak handle
// processing callbacks which may create new environments.
Genesis* previous_;
Handle<Context> global_context() { return global_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> GetThrowTypeErrorFunction();
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_template,
Handle<Object> global_object,
Handle<GlobalObject>* global_proxy_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> inner_global,
Handle<JSGlobalProxy> global_proxy);
// Similarly, we want to use the inner global that has been created by the
// templates passed through the API. The inner global from the snapshot is
// detached from the other objects in the snapshot.
void HookUpInnerGlobal(Handle<GlobalObject> inner_global);
// New context initialization. Used for creating a context from scratch.
bool InitializeGlobal(Handle<GlobalObject> inner_global,
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();
bool InstallNatives();
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> global_context,
v8::ExtensionConfiguration* extensions);
static bool InstallExtension(const char* name,
ExtensionStates* extension_states);
static bool InstallExtension(v8::RegisteredExtension* current,
ExtensionStates* extension_states);
static void InstallSpecialObjects(Handle<Context> global_context);
bool InstallJSBuiltins(Handle<JSBuiltinsObject> builtins);
bool ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template);
bool ConfigureGlobalObjects(v8::Handle<v8::ObjectTemplate> global_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 PrototypePropertyMode {
DONT_ADD_PROTOTYPE,
ADD_READONLY_PROTOTYPE,
ADD_WRITEABLE_PROTOTYPE
};
Handle<Map> CreateFunctionMap(PrototypePropertyMode prototype_mode);
Handle<DescriptorArray> ComputeFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode);
void MakeFunctionInstancePrototypeWritable();
Handle<Map> CreateStrictModeFunctionMap(
PrototypePropertyMode prototype_mode,
Handle<JSFunction> empty_function);
Handle<DescriptorArray> ComputeStrictFunctionInstanceDescriptor(
PrototypePropertyMode propertyMode);
static bool CompileBuiltin(Isolate* isolate, int index);
static bool CompileExperimentalBuiltin(Isolate* isolate, int index);
static bool CompileNative(Vector<const char> name, Handle<String> source);
static bool CompileScriptCached(Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context);
Handle<Context> result_;
// Function instance maps. Function literal maps are created initially with
// a read only prototype for the processing of JS builtins. Later the function
// instance maps are replaced in order to make prototype writable.
// These are the final, writable prototype, maps.
Handle<Map> function_instance_map_writable_prototype_;
Handle<Map> strict_mode_function_instance_map_writable_prototype_;
Handle<JSFunction> throw_type_error_function;
BootstrapperActive active_;
friend class Bootstrapper;
};
void Bootstrapper::Iterate(ObjectVisitor* v) {
extensions_cache_.Iterate(v);
v->Synchronize(VisitorSynchronization::kExtensions);
}
Handle<Context> Bootstrapper::CreateEnvironment(
Isolate* isolate,
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
HandleScope scope;
Handle<Context> env;
Genesis genesis(isolate, global_object, global_template, extensions);
env = genesis.result();
if (!env.is_null()) {
if (InstallExtensions(env, extensions)) {
return env;
}
}
return Handle<Context>();
}
static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) {
// object.__proto__ = proto;
Factory* factory = object->GetIsolate()->factory();
Handle<Map> old_to_map = Handle<Map>(object->map());
Handle<Map> new_to_map = factory->CopyMap(old_to_map);
new_to_map->set_prototype(*proto);
object->set_map(*new_to_map);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
Factory* factory = env->GetIsolate()->factory();
JSGlobalProxy::cast(env->global_proxy())->set_context(*factory->null_value());
SetObjectPrototype(Handle<JSObject>(env->global_proxy()),
factory->null_value());
env->set_global_proxy(env->global());
env->global()->set_global_receiver(env->global());
}
void Bootstrapper::ReattachGlobal(Handle<Context> env,
Handle<Object> global_object) {
ASSERT(global_object->IsJSGlobalProxy());
Handle<JSGlobalProxy> global = Handle<JSGlobalProxy>::cast(global_object);
env->global()->set_global_receiver(*global);
env->set_global_proxy(*global);
SetObjectPrototype(global, Handle<JSObject>(env->global()));
global->set_context(*env);
}
static Handle<JSFunction> InstallFunction(Handle<JSObject> target,
const char* name,
InstanceType type,
int instance_size,
Handle<JSObject> prototype,
Builtins::Name call,
bool is_ecma_native) {
Isolate* isolate = target->GetIsolate();
Factory* factory = isolate->factory();
Handle<String> symbol = factory->LookupAsciiSymbol(name);
Handle<Code> call_code = Handle<Code>(isolate->builtins()->builtin(call));
Handle<JSFunction> function = prototype.is_null() ?
factory->NewFunctionWithoutPrototype(symbol, call_code) :
factory->NewFunctionWithPrototype(symbol,
type,
instance_size,
prototype,
call_code,
is_ecma_native);
PropertyAttributes attributes;
if (target->IsJSBuiltinsObject()) {
attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
} else {
attributes = DONT_ENUM;
}
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
target, symbol, function, attributes));
if (is_ecma_native) {
function->shared()->set_instance_class_name(*symbol);
}
function->shared()->set_native(true);
return function;
}
Handle<DescriptorArray> Genesis::ComputeFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode) {
int size = (prototypeMode == DONT_ADD_PROTOTYPE) ? 4 : 5;
Handle<DescriptorArray> descriptors(factory()->NewDescriptorArray(size));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
DescriptorArray::WhitenessWitness witness(*descriptors);
{ // Add length.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionLength));
CallbacksDescriptor d(*factory()->length_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
{ // Add name.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionName));
CallbacksDescriptor d(*factory()->name_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
{ // Add arguments.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionArguments));
CallbacksDescriptor d(*factory()->arguments_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
{ // Add caller.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionCaller));
CallbacksDescriptor d(*factory()->caller_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
if (prototypeMode != DONT_ADD_PROTOTYPE) {
// Add prototype.
if (prototypeMode == ADD_WRITEABLE_PROTOTYPE) {
attribs = static_cast<PropertyAttributes>(attribs & ~READ_ONLY);
}
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionPrototype));
CallbacksDescriptor d(*factory()->prototype_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
descriptors->Sort(witness);
return descriptors;
}
Handle<Map> Genesis::CreateFunctionMap(PrototypePropertyMode prototype_mode) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
Handle<DescriptorArray> descriptors =
ComputeFunctionInstanceDescriptor(prototype_mode);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(prototype_mode != DONT_ADD_PROTOTYPE);
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.
// Please note that the prototype property for function instances must be
// writable.
Handle<Map> function_instance_map =
CreateFunctionMap(ADD_WRITEABLE_PROTOTYPE);
global_context()->set_function_instance_map(*function_instance_map);
// Functions with this map will not have a 'prototype' property, and
// can not be used as constructors.
Handle<Map> function_without_prototype_map =
CreateFunctionMap(DONT_ADD_PROTOTYPE);
global_context()->set_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(ADD_READONLY_PROTOTYPE);
global_context()->set_function_map(*function_map);
// The final map for functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
function_instance_map_writable_prototype_ =
CreateFunctionMap(ADD_WRITEABLE_PROTOTYPE);
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
Handle<String> object_name = Handle<String>(heap->Object_symbol());
{ // --- O b j e c t ---
Handle<JSFunction> object_fun =
factory->NewFunction(object_name, factory->null_value());
Handle<Map> object_function_map =
factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
object_fun->set_initial_map(*object_function_map);
object_function_map->set_constructor(*object_fun);
global_context()->set_object_function(*object_fun);
// Allocate a new prototype for the object function.
Handle<JSObject> prototype = factory->NewJSObject(
isolate->object_function(),
TENURED);
global_context()->set_initial_object_prototype(*prototype);
SetPrototype(object_fun, prototype);
object_function_map->set_instance_descriptors(
heap->empty_descriptor_array());
}
// Allocate the empty function as the prototype for function ECMAScript
// 262 15.3.4.
Handle<String> symbol = factory->LookupAsciiSymbol("Empty");
Handle<JSFunction> empty_function =
factory->NewFunctionWithoutPrototype(symbol, CLASSIC_MODE);
// --- E m p t y ---
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kEmptyFunction));
empty_function->set_code(*code);
empty_function->shared()->set_code(*code);
Handle<String> source = factory->NewStringFromAscii(CStrVector("() {}"));
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.
global_context()->function_map()->set_prototype(*empty_function);
global_context()->function_instance_map()->set_prototype(*empty_function);
global_context()->function_without_prototype_map()->
set_prototype(*empty_function);
function_instance_map_writable_prototype_->set_prototype(*empty_function);
// Allocate the function map first and then patch the prototype later
Handle<Map> empty_function_map = CreateFunctionMap(DONT_ADD_PROTOTYPE);
empty_function_map->set_prototype(
global_context()->object_function()->prototype());
empty_function->set_map(*empty_function_map);
return empty_function;
}
Handle<DescriptorArray> Genesis::ComputeStrictFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode) {
int size = (prototypeMode == DONT_ADD_PROTOTYPE) ? 4 : 5;
Handle<DescriptorArray> descriptors(factory()->NewDescriptorArray(size));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
DescriptorArray::WhitenessWitness witness(*descriptors);
{ // Add length.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionLength));
CallbacksDescriptor d(*factory()->length_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
{ // Add name.
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionName));
CallbacksDescriptor d(*factory()->name_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
{ // Add arguments.
Handle<AccessorPair> arguments(factory()->NewAccessorPair());
CallbacksDescriptor d(*factory()->arguments_symbol(), *arguments, attribs);
descriptors->Append(&d, witness);
}
{ // Add caller.
Handle<AccessorPair> caller(factory()->NewAccessorPair());
CallbacksDescriptor d(*factory()->caller_symbol(), *caller, attribs);
descriptors->Append(&d, witness);
}
if (prototypeMode != DONT_ADD_PROTOTYPE) {
// Add prototype.
if (prototypeMode != ADD_WRITEABLE_PROTOTYPE) {
attribs = static_cast<PropertyAttributes>(attribs | READ_ONLY);
}
Handle<Foreign> f(factory()->NewForeign(&Accessors::FunctionPrototype));
CallbacksDescriptor d(*factory()->prototype_symbol(), *f, attribs);
descriptors->Append(&d, witness);
}
descriptors->Sort(witness);
return descriptors;
}
// ECMAScript 5th Edition, 13.2.3
Handle<JSFunction> Genesis::GetThrowTypeErrorFunction() {
if (throw_type_error_function.is_null()) {
Handle<String> name = factory()->LookupAsciiSymbol("ThrowTypeError");
throw_type_error_function =
factory()->NewFunctionWithoutPrototype(name, CLASSIC_MODE);
Handle<Code> code(isolate()->builtins()->builtin(
Builtins::kStrictModePoisonPill));
throw_type_error_function->set_map(
global_context()->function_map());
throw_type_error_function->set_code(*code);
throw_type_error_function->shared()->set_code(*code);
throw_type_error_function->shared()->DontAdaptArguments();
JSObject::PreventExtensions(throw_type_error_function);
}
return throw_type_error_function;
}
Handle<Map> Genesis::CreateStrictModeFunctionMap(
PrototypePropertyMode prototype_mode,
Handle<JSFunction> empty_function) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
Handle<DescriptorArray> descriptors =
ComputeStrictFunctionInstanceDescriptor(prototype_mode);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(prototype_mode != DONT_ADD_PROTOTYPE);
map->set_prototype(*empty_function);
return map;
}
void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
// Allocate map for the strict mode function instances.
Handle<Map> strict_mode_function_instance_map =
CreateStrictModeFunctionMap(ADD_WRITEABLE_PROTOTYPE, empty);
global_context()->set_strict_mode_function_instance_map(
*strict_mode_function_instance_map);
// Allocate map for the prototype-less strict mode instances.
Handle<Map> strict_mode_function_without_prototype_map =
CreateStrictModeFunctionMap(DONT_ADD_PROTOTYPE, empty);
global_context()->set_strict_mode_function_without_prototype_map(
*strict_mode_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_mode_function_map =
CreateStrictModeFunctionMap(ADD_READONLY_PROTOTYPE, empty);
global_context()->set_strict_mode_function_map(
*strict_mode_function_map);
// The final map for the strict mode functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
strict_mode_function_instance_map_writable_prototype_ =
CreateStrictModeFunctionMap(ADD_WRITEABLE_PROTOTYPE, empty);
// Complete the callbacks.
PoisonArgumentsAndCaller(strict_mode_function_instance_map);
PoisonArgumentsAndCaller(strict_mode_function_without_prototype_map);
PoisonArgumentsAndCaller(strict_mode_function_map);
PoisonArgumentsAndCaller(
strict_mode_function_instance_map_writable_prototype_);
}
static void SetAccessors(Handle<Map> map,
Handle<String> name,
Handle<JSFunction> func) {
DescriptorArray* descs = map->instance_descriptors();
int number = descs->Search(*name);
AccessorPair* accessors = AccessorPair::cast(descs->GetValue(number));
accessors->set_getter(*func);
accessors->set_setter(*func);
}
void Genesis::PoisonArgumentsAndCaller(Handle<Map> map) {
SetAccessors(map, factory()->arguments_symbol(), GetThrowTypeErrorFunction());
SetAccessors(map, factory()->caller_symbol(), GetThrowTypeErrorFunction());
}
static void AddToWeakGlobalContextList(Context* context) {
ASSERT(context->IsGlobalContext());
Heap* heap = context->GetIsolate()->heap();
#ifdef DEBUG
{ // NOLINT
ASSERT(context->get(Context::NEXT_CONTEXT_LINK)->IsUndefined());
// Check that context is not in the list yet.
for (Object* current = heap->global_contexts_list();
!current->IsUndefined();
current = Context::cast(current)->get(Context::NEXT_CONTEXT_LINK)) {
ASSERT(current != context);
}
}
#endif
context->set(Context::NEXT_CONTEXT_LINK, heap->global_contexts_list());
heap->set_global_contexts_list(context);
}
void Genesis::CreateRoots() {
// Allocate the global 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
// global context).
global_context_ = Handle<Context>::cast(isolate()->global_handles()->Create(
*factory()->NewGlobalContext()));
AddToWeakGlobalContextList(*global_context_);
isolate()->set_context(*global_context());
// Allocate the message listeners object.
{
v8::NeanderArray listeners;
global_context()->set_message_listeners(*listeners.value());
}
}
Handle<JSGlobalProxy> Genesis::CreateNewGlobals(
v8::Handle<v8::ObjectTemplate> global_template,
Handle<Object> global_object,
Handle<GlobalObject>* inner_global_out) {
// The argument global_template aka data is an ObjectTemplateInfo.
// It has a constructor pointer that points at global_constructor which is a
// FunctionTemplateInfo.
// The global_constructor is used to create or reinitialize the global_proxy.
// The global_constructor also has a prototype_template pointer that points at
// js_global_template which is an ObjectTemplateInfo.
// That in turn has a constructor pointer that points at
// js_global_constructor which is a FunctionTemplateInfo.
// js_global_constructor is used to make js_global_function
// js_global_function is used to make the new inner_global.
//
// --- G l o b a l ---
// Step 1: Create a fresh inner JSGlobalObject.
Handle<JSFunction> js_global_function;
Handle<ObjectTemplateInfo> js_global_template;
if (!global_template.IsEmpty()) {
// Get prototype template of the global_template.
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_template);
Handle<FunctionTemplateInfo> global_constructor =
Handle<FunctionTemplateInfo>(
FunctionTemplateInfo::cast(data->constructor()));
Handle<Object> proto_template(global_constructor->prototype_template());
if (!proto_template->IsUndefined()) {
js_global_template =
Handle<ObjectTemplateInfo>::cast(proto_template);
}
}
if (js_global_template.is_null()) {
Handle<String> name = Handle<String>(heap()->empty_symbol());
Handle<Code> code = Handle<Code>(isolate()->builtins()->builtin(
Builtins::kIllegal));
js_global_function =
factory()->NewFunction(name, JS_GLOBAL_OBJECT_TYPE,
JSGlobalObject::kSize, code, true);
// Change the constructor property of the prototype of the
// hidden global function to refer to the Object function.
Handle<JSObject> prototype =
Handle<JSObject>(
JSObject::cast(js_global_function->instance_prototype()));
CHECK_NOT_EMPTY_HANDLE(isolate(),
JSObject::SetLocalPropertyIgnoreAttributes(
prototype, factory()->constructor_symbol(),
isolate()->object_function(), NONE));
} else {
Handle<FunctionTemplateInfo> js_global_constructor(
FunctionTemplateInfo::cast(js_global_template->constructor()));
js_global_function =
factory()->CreateApiFunction(js_global_constructor,
factory()->InnerGlobalObject);
}
js_global_function->initial_map()->set_is_hidden_prototype();
Handle<GlobalObject> inner_global =
factory()->NewGlobalObject(js_global_function);
if (inner_global_out != NULL) {
*inner_global_out = inner_global;
}
// Step 2: create or re-initialize the global proxy object.
Handle<JSFunction> global_proxy_function;
if (global_template.IsEmpty()) {
Handle<String> name = Handle<String>(heap()->empty_symbol());
Handle<Code> code = Handle<Code>(isolate()->builtins()->builtin(
Builtins::kIllegal));
global_proxy_function =
factory()->NewFunction(name, JS_GLOBAL_PROXY_TYPE,
JSGlobalProxy::kSize, code, true);
} else {
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_template);
Handle<FunctionTemplateInfo> global_constructor(
FunctionTemplateInfo::cast(data->constructor()));
global_proxy_function =
factory()->CreateApiFunction(global_constructor,
factory()->OuterGlobalObject);
}
Handle<String> global_name = factory()->LookupAsciiSymbol("global");
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.
if (global_object.location() != NULL) {
ASSERT(global_object->IsJSGlobalProxy());
return ReinitializeJSGlobalProxy(
global_proxy_function,
Handle<JSGlobalProxy>::cast(global_object));
} else {
return Handle<JSGlobalProxy>::cast(
factory()->NewJSObject(global_proxy_function, TENURED));
}
}
void Genesis::HookUpGlobalProxy(Handle<GlobalObject> inner_global,
Handle<JSGlobalProxy> global_proxy) {
// Set the global context for the global object.
inner_global->set_global_context(*global_context());
inner_global->set_global_receiver(*global_proxy);
global_proxy->set_context(*global_context());
global_context()->set_global_proxy(*global_proxy);
}
void Genesis::HookUpInnerGlobal(Handle<GlobalObject> inner_global) {
Handle<GlobalObject> inner_global_from_snapshot(
GlobalObject::cast(global_context_->extension()));
Handle<JSBuiltinsObject> builtins_global(global_context_->builtins());
global_context_->set_extension(*inner_global);
global_context_->set_global(*inner_global);
global_context_->set_security_token(*inner_global);
static const PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
ForceSetProperty(builtins_global,
factory()->LookupAsciiSymbol("global"),
inner_global,
attributes);
// Set up the reference from the global object to the builtins object.
JSGlobalObject::cast(*inner_global)->set_builtins(*builtins_global);
TransferNamedProperties(inner_global_from_snapshot, inner_global);
TransferIndexedProperties(inner_global_from_snapshot, inner_global);
}
// This is only called if we are not using snapshots. The equivalent
// work in the snapshot case is done in HookUpInnerGlobal.
bool Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
Handle<JSFunction> empty_function) {
// --- G l o b a l C o n t e x t ---
// Use the empty function as closure (no scope info).
global_context()->set_closure(*empty_function);
global_context()->set_previous(NULL);
// Set extension and global object.
global_context()->set_extension(*inner_global);
global_context()->set_global(*inner_global);
// Security setup: Set the security token of the global object to
// its the inner global. This makes the security check between two
// different contexts fail by default even in case of global
// object reinitialization.
global_context()->set_security_token(*inner_global);
Isolate* isolate = inner_global->GetIsolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
Handle<String> object_name = Handle<String>(heap->Object_symbol());
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
inner_global, object_name,
isolate->object_function(), DONT_ENUM));
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
// Install global Function object
InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
empty_function, Builtins::kIllegal, true); // ECMA native.
{ // --- A r r a y ---
Handle<JSFunction> array_function =
InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
isolate->initial_object_prototype(),
Builtins::kArrayCode, true);
array_function->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kArrayConstructCode));
array_function->shared()->DontAdaptArguments();
// This seems a bit hackish, but we need to make sure Array.length
// is 1.
array_function->shared()->set_length(1);
Handle<DescriptorArray> array_descriptors =
factory->CopyAppendForeignDescriptor(
factory->empty_descriptor_array(),
factory->length_symbol(),
factory->NewForeign(&Accessors::ArrayLength),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE));
// 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.
global_context()->set_array_function(*array_function);
array_function->initial_map()->set_instance_descriptors(*array_descriptors);
}
{ // --- N u m b e r ---
Handle<JSFunction> number_fun =
InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
global_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, true);
global_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, true);
string_fun->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kStringConstructCode));
global_context()->set_string_function(*string_fun);
// Add 'length' property to strings.
Handle<DescriptorArray> string_descriptors =
factory->CopyAppendForeignDescriptor(
factory->empty_descriptor_array(),
factory->length_symbol(),
factory->NewForeign(&Accessors::StringLength),
static_cast<PropertyAttributes>(DONT_ENUM |
DONT_DELETE |
READ_ONLY));
Handle<Map> string_map =
Handle<Map>(global_context()->string_function()->initial_map());
string_map->set_instance_descriptors(*string_descriptors);
}
{ // --- 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, true);
global_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, true);
global_context()->set_regexp_function(*regexp_fun);
ASSERT(regexp_fun->has_initial_map());
Handle<Map> initial_map(regexp_fun->initial_map());
ASSERT_EQ(0, initial_map->inobject_properties());
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(5);
DescriptorArray::WhitenessWitness witness(*descriptors);
PropertyAttributes final =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
{
// ECMA-262, section 15.10.7.1.
FieldDescriptor field(heap->source_symbol(),
JSRegExp::kSourceFieldIndex,
final);
descriptors->Append(&field, witness);
}
{
// ECMA-262, section 15.10.7.2.
FieldDescriptor field(heap->global_symbol(),
JSRegExp::kGlobalFieldIndex,
final);
descriptors->Append(&field, witness);
}
{
// ECMA-262, section 15.10.7.3.
FieldDescriptor field(heap->ignore_case_symbol(),
JSRegExp::kIgnoreCaseFieldIndex,
final);
descriptors->Append(&field, witness);
}
{
// ECMA-262, section 15.10.7.4.
FieldDescriptor field(heap->multiline_symbol(),
JSRegExp::kMultilineFieldIndex,
final);
descriptors->Append(&field, witness);
}
{
// ECMA-262, section 15.10.7.5.
PropertyAttributes writable =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
FieldDescriptor field(heap->last_index_symbol(),
JSRegExp::kLastIndexFieldIndex,
writable);
descriptors->Append(&field, witness);
}
descriptors->Sort(witness);
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_instance_descriptors(*descriptors);
initial_map->set_visitor_id(StaticVisitorBase::GetVisitorId(*initial_map));
// RegExp prototype object is itself a RegExp.
Handle<Map> proto_map = factory->CopyMap(initial_map);
proto_map->set_prototype(global_context()->initial_object_prototype());
Handle<JSObject> proto = factory->NewJSObjectFromMap(proto_map);
proto->InObjectPropertyAtPut(JSRegExp::kSourceFieldIndex,
heap->query_colon_symbol());
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.
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->NewStringFromAscii(CStrVector("JSON"));
Handle<JSFunction> cons = factory->NewFunction(name,
factory->the_hole_value());
{ MaybeObject* result = cons->SetInstancePrototype(
global_context()->initial_object_prototype());
if (result->IsFailure()) return false;
}
cons->SetInstanceClassName(*name);
Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
ASSERT(json_object->IsJSObject());
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
global, name, json_object, DONT_ENUM));
global_context()->set_json_object(*json_object);
}
{ // --- arguments_boilerplate_
// Make sure we can recognize argument objects at runtime.
// This is done by introducing an anonymous function with
// class_name equals 'Arguments'.
Handle<String> symbol = factory->LookupAsciiSymbol("Arguments");
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSObject> prototype =
Handle<JSObject>(
JSObject::cast(global_context()->object_function()->prototype()));
Handle<JSFunction> function =
factory->NewFunctionWithPrototype(symbol,
JS_OBJECT_TYPE,
JSObject::kHeaderSize,
prototype,
code,
false);
ASSERT(!function->has_initial_map());
function->shared()->set_instance_class_name(*symbol);
function->shared()->set_expected_nof_properties(2);
Handle<JSObject> result = factory->NewJSObject(function);
global_context()->set_arguments_boilerplate(*result);
// Note: length must be added as the first property and
// callee must be added as the second property.
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
result, factory->length_symbol(),
factory->undefined_value(), DONT_ENUM));
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
result, factory->callee_symbol(),
factory->undefined_value(), DONT_ENUM));
#ifdef DEBUG
LookupResult lookup(isolate);
result->LocalLookup(heap->callee_symbol(), &lookup);
ASSERT(lookup.IsField());
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsCalleeIndex);
result->LocalLookup(heap->length_symbol(), &lookup);
ASSERT(lookup.IsField());
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsCalleeIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsLengthIndex);
// Check the state of the object.
ASSERT(result->HasFastProperties());
ASSERT(result->HasFastObjectElements());
#endif
}
{ // --- aliased_arguments_boilerplate_
// Set up a well-formed parameter map to make assertions happy.
Handle<FixedArray> elements = factory->NewFixedArray(2);
elements->set_map(heap->non_strict_arguments_elements_map());
Handle<FixedArray> array;
array = factory->NewFixedArray(0);
elements->set(0, *array);
array = factory->NewFixedArray(0);
elements->set(1, *array);
Handle<Map> old_map(global_context()->arguments_boilerplate()->map());
Handle<Map> new_map = factory->CopyMap(old_map);
new_map->set_pre_allocated_property_fields(2);
Handle<JSObject> result = factory->NewJSObjectFromMap(new_map);
// Set elements kind after allocating the object because
// NewJSObjectFromMap assumes a fast elements map.
new_map->set_elements_kind(NON_STRICT_ARGUMENTS_ELEMENTS);
result->set_elements(*elements);
ASSERT(result->HasNonStrictArgumentsElements());
global_context()->set_aliased_arguments_boilerplate(*result);
}
{ // --- strict mode arguments boilerplate
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> throw_function =
GetThrowTypeErrorFunction();
// Install the ThrowTypeError functions.
callee->set_getter(*throw_function);
callee->set_setter(*throw_function);
caller->set_getter(*throw_function);
caller->set_setter(*throw_function);
// Create the descriptor array for the arguments object.
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(3);
DescriptorArray::WhitenessWitness witness(*descriptors);
{ // length
FieldDescriptor d(*factory->length_symbol(), 0, DONT_ENUM);
descriptors->Append(&d, witness);
}
{ // callee
CallbacksDescriptor d(*factory->callee_symbol(),
*callee,
attributes);
descriptors->Append(&d, witness);
}
{ // caller
CallbacksDescriptor d(*factory->caller_symbol(),
*caller,
attributes);
descriptors->Append(&d, witness);
}
descriptors->Sort(witness);
// Create the map. Allocate one in-object field for length.
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE,
Heap::kArgumentsObjectSizeStrict);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(true);
map->set_prototype(global_context()->object_function()->prototype());
map->set_pre_allocated_property_fields(1);
map->set_inobject_properties(1);
// Copy constructor from the non-strict arguments boilerplate.
map->set_constructor(
global_context()->arguments_boilerplate()->map()->constructor());
// Allocate the arguments boilerplate object.
Handle<JSObject> result = factory->NewJSObjectFromMap(map);
global_context()->set_strict_mode_arguments_boilerplate(*result);
// Add length property only for strict mode boilerplate.
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
result, factory->length_symbol(),
factory->undefined_value(), DONT_ENUM));
#ifdef DEBUG
LookupResult lookup(isolate);
result->LocalLookup(heap->length_symbol(), &lookup);
ASSERT(lookup.IsField());
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsLengthIndex);
// Check the state of the object.
ASSERT(result->HasFastProperties());
ASSERT(result->HasFastObjectElements());
#endif
}
{ // --- 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_symbol(),
JS_CONTEXT_EXTENSION_OBJECT_TYPE,
JSObject::kHeaderSize,
code,
true);
Handle<String> name = factory->LookupAsciiSymbol("context_extension");
context_extension_fun->shared()->set_instance_class_name(*name);
global_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_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_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_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_context()->set_call_as_constructor_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
// Initialize the out of memory slot.
global_context()->set_out_of_memory(heap->false_value());
// Initialize the data slot.
global_context()->set_data(heap->undefined_value());
{
// Initialize the random seed slot.
Handle<ByteArray> zeroed_byte_array(
factory->NewByteArray(kRandomStateSize));
global_context()->set_random_seed(*zeroed_byte_array);
memset(zeroed_byte_array->GetDataStartAddress(), 0, kRandomStateSize);
}
return true;
}
void Genesis::InitializeExperimentalGlobal() {
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
// TODO(mstarzinger): Move this into Genesis::InitializeGlobal once we no
// longer need to live behind a flag, so functions get added to the snapshot.
if (FLAG_harmony_collections) {
{ // -- S e t
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
InstallFunction(global, "Set", JS_SET_TYPE, JSSet::kSize,
prototype, Builtins::kIllegal, true);
}
{ // -- M a p
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
InstallFunction(global, "Map", JS_MAP_TYPE, JSMap::kSize,
prototype, Builtins::kIllegal, true);
}
{ // -- W e a k M a p
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
InstallFunction(global, "WeakMap", JS_WEAK_MAP_TYPE, JSWeakMap::kSize,
prototype, Builtins::kIllegal, true);
}
}
}
bool Genesis::CompileBuiltin(Isolate* isolate, int index) {
Vector<const char> name = Natives::GetScriptName(index);
Handle<String> source_code =
isolate->bootstrapper()->NativesSourceLookup(index);
return CompileNative(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 =
factory->NewStringFromAscii(
ExperimentalNatives::GetRawScriptSource(index));
return CompileNative(name, source_code);
}
bool Genesis::CompileNative(Vector<const char> name, Handle<String> source) {
HandleScope scope;
Isolate* isolate = source->GetIsolate();
#ifdef ENABLE_DEBUGGER_SUPPORT
isolate->debugger()->set_compiling_natives(true);
#endif
// 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::Current());
if (check.HasOverflowed()) return false;
bool result = CompileScriptCached(name,
source,
NULL,
NULL,
Handle<Context>(isolate->context()),
true);
ASSERT(isolate->has_pending_exception() != result);
if (!result) isolate->clear_pending_exception();
#ifdef ENABLE_DEBUGGER_SUPPORT
isolate->debugger()->set_compiling_natives(false);
#endif
return result;
}
bool Genesis::CompileScriptCached(Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context) {
Factory* factory = source->GetIsolate()->factory();
HandleScope scope;
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)) {
ASSERT(source->IsAsciiRepresentation());
Handle<String> script_name = factory->NewStringFromUtf8(name);
function_info = Compiler::Compile(
source,
script_name,
0,
0,
extension,
NULL,
Handle<String>::null(),
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.
ASSERT(top_context->IsGlobalContext());
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());
bool has_pending_exception;
Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
if (has_pending_exception) return false;
return true;
}
#define INSTALL_NATIVE(Type, name, var) \
Handle<String> var##_name = factory()->LookupAsciiSymbol(name); \
Object* var##_native = \
global_context()->builtins()->GetPropertyNoExceptionThrown( \
*var##_name); \
global_context()->set_##var(Type::cast(var##_native));
void Genesis::InstallNativeFunctions() {
HandleScope scope;
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);
}
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
bool Genesis::InstallNatives() {
HandleScope scope;
// 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 global_context directly in the object.
Handle<Code> code = Handle<Code>(
isolate()->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> builtins_fun =
factory()->NewFunction(factory()->empty_symbol(),
JS_BUILTINS_OBJECT_TYPE,
JSBuiltinsObject::kSize, code, true);
Handle<String> name = factory()->LookupAsciiSymbol("builtins");
builtins_fun->shared()->set_instance_class_name(*name);
// Allocate the builtins object.
Handle<JSBuiltinsObject> builtins =
Handle<JSBuiltinsObject>::cast(factory()->NewGlobalObject(builtins_fun));
builtins->set_builtins(*builtins);
builtins->set_global_context(*global_context());
builtins->set_global_receiver(*builtins);
// 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_symbol = factory()->LookupAsciiSymbol("global");
Handle<Object> global_obj(global_context()->global());
CHECK_NOT_EMPTY_HANDLE(isolate(),
JSObject::SetLocalPropertyIgnoreAttributes(
builtins, global_symbol, global_obj, attributes));
// Set up the reference from the global object to the builtins object.
JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins);
// Create a bridge function that has context in the global context.
Handle<JSFunction> bridge =
factory()->NewFunction(factory()->empty_symbol(),
factory()->undefined_value());
ASSERT(bridge->context() == *isolate()->global_context());
// Allocate the builtins context.
Handle<Context> context =
factory()->NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge);
context->set_global(*builtins); // override builtins global object
global_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, false);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SetPrototype(script_fun, prototype);
global_context()->set_script_function(*script_fun);
// Add 'source' and 'data' property to scripts.
PropertyAttributes common_attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<Foreign> foreign_source =
factory()->NewForeign(&Accessors::ScriptSource);
Handle<DescriptorArray> script_descriptors =
factory()->CopyAppendForeignDescriptor(
factory()->empty_descriptor_array(),
factory()->LookupAsciiSymbol("source"),
foreign_source,
common_attributes);
Handle<Foreign> foreign_name =
factory()->NewForeign(&Accessors::ScriptName);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("name"),
foreign_name,
common_attributes);
Handle<Foreign> foreign_id = factory()->NewForeign(&Accessors::ScriptId);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("id"),
foreign_id,
common_attributes);
Handle<Foreign> foreign_line_offset =
factory()->NewForeign(&Accessors::ScriptLineOffset);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("line_offset"),
foreign_line_offset,
common_attributes);
Handle<Foreign> foreign_column_offset =
factory()->NewForeign(&Accessors::ScriptColumnOffset);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("column_offset"),
foreign_column_offset,
common_attributes);
Handle<Foreign> foreign_data =
factory()->NewForeign(&Accessors::ScriptData);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("data"),
foreign_data,
common_attributes);
Handle<Foreign> foreign_type =
factory()->NewForeign(&Accessors::ScriptType);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("type"),
foreign_type,
common_attributes);
Handle<Foreign> foreign_compilation_type =
factory()->NewForeign(&Accessors::ScriptCompilationType);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("compilation_type"),
foreign_compilation_type,
common_attributes);
Handle<Foreign> foreign_line_ends =
factory()->NewForeign(&Accessors::ScriptLineEnds);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("line_ends"),
foreign_line_ends,
common_attributes);
Handle<Foreign> foreign_context_data =
factory()->NewForeign(&Accessors::ScriptContextData);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("context_data"),
foreign_context_data,
common_attributes);
Handle<Foreign> foreign_eval_from_script =
factory()->NewForeign(&Accessors::ScriptEvalFromScript);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("eval_from_script"),
foreign_eval_from_script,
common_attributes);
Handle<Foreign> foreign_eval_from_script_position =
factory()->NewForeign(&Accessors::ScriptEvalFromScriptPosition);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("eval_from_script_position"),
foreign_eval_from_script_position,
common_attributes);
Handle<Foreign> foreign_eval_from_function_name =
factory()->NewForeign(&Accessors::ScriptEvalFromFunctionName);
script_descriptors =
factory()->CopyAppendForeignDescriptor(
script_descriptors,
factory()->LookupAsciiSymbol("eval_from_function_name"),
foreign_eval_from_function_name,
common_attributes);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
script_map->set_instance_descriptors(*script_descriptors);
// 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, false);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SetPrototype(opaque_reference_fun, prototype);
global_context()->set_opaque_reference_function(*opaque_reference_fun);
}
{ // --- 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<JSFunction> array_function =
InstallFunction(builtins,
"InternalArray",
JS_ARRAY_TYPE,
JSArray::kSize,
isolate()->initial_object_prototype(),
Builtins::kInternalArrayCode,
true);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SetPrototype(array_function, prototype);
array_function->shared()->set_construct_stub(
isolate()->builtins()->builtin(Builtins::kArrayConstructCode));
array_function->shared()->DontAdaptArguments();
// 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.
MaybeObject* maybe_map =
array_function->initial_map()->Copy(DescriptorArray::MAY_BE_SHARED);
Map* new_map;
if (!maybe_map->To(&new_map)) return false;
new_map->set_elements_kind(FAST_HOLEY_ELEMENTS);
array_function->set_initial_map(new_map);
// Make "length" magic on instances.
Handle<DescriptorArray> array_descriptors =
factory()->CopyAppendForeignDescriptor(
factory()->empty_descriptor_array(),
factory()->length_symbol(),
factory()->NewForeign(&Accessors::ArrayLength),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE));
array_function->initial_map()->set_instance_descriptors(
*array_descriptors);
global_context()->set_internal_array_function(*array_function);
}
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(global_context()->string_function());
ASSERT(JSObject::cast(
string_function->initial_map()->prototype())->HasFastProperties());
global_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_class_symbol();
Handle<JSFunction> function =
Handle<JSFunction>::cast(GetProperty(isolate()->global(), key));
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,
Handle<JSObject>::null(),
Builtins::kFunctionCall,
false);
Handle<JSFunction> apply =
InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
Handle<JSObject>::null(),
Builtins::kFunctionApply,
false);
// 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();
ASSERT(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(global_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".
Handle<DescriptorArray> reresult_descriptors =
factory()->NewDescriptorArray(3);
DescriptorArray::WhitenessWitness witness(*reresult_descriptors);
JSFunction* array_function = global_context()->array_function();
Handle<DescriptorArray> array_descriptors(
array_function->initial_map()->instance_descriptors());
int old = array_descriptors->SearchWithCache(heap()->length_symbol());
reresult_descriptors->CopyFrom(0, *array_descriptors, old, witness);
reresult_descriptors->SetLastAdded(0);
{
FieldDescriptor index_field(heap()->index_symbol(),
JSRegExpResult::kIndexIndex,
NONE);
reresult_descriptors->Append(&index_field, witness);
}
{
FieldDescriptor input_field(heap()->input_symbol(),
JSRegExpResult::kInputIndex,
NONE);
reresult_descriptors->Append(&input_field, witness);
}
reresult_descriptors->Sort(witness);
initial_map->set_inobject_properties(2);
initial_map->set_pre_allocated_property_fields(2);
initial_map->set_unused_property_fields(0);
initial_map->set_instance_descriptors(*reresult_descriptors);
global_context()->set_regexp_result_map(*initial_map);
}
#ifdef DEBUG
builtins->Verify();
#endif
return true;
}
bool Genesis::InstallExperimentalNatives() {
for (int i = ExperimentalNatives::GetDebuggerCount();
i < ExperimentalNatives::GetBuiltinsCount();
i++) {
if (FLAG_harmony_proxies &&
strcmp(ExperimentalNatives::GetScriptName(i).start(),
"native proxy.js") == 0) {
if (!CompileExperimentalBuiltin(isolate(), i)) return false;
}
if (FLAG_harmony_collections &&
strcmp(ExperimentalNatives::GetScriptName(i).start(),
"native collection.js") == 0) {
if (!CompileExperimentalBuiltin(isolate(), i)) return false;
}
}
InstallExperimentalNativeFunctions();
return true;
}
static Handle<JSObject> ResolveBuiltinIdHolder(
Handle<Context> global_context,
const char* holder_expr) {
Factory* factory = global_context->GetIsolate()->factory();
Handle<GlobalObject> global(global_context->global());
const char* period_pos = strchr(holder_expr, '.');
if (period_pos == NULL) {
return Handle<JSObject>::cast(
GetProperty(global, factory->LookupAsciiSymbol(holder_expr)));
}
ASSERT_EQ(".prototype", period_pos);
Vector<const char> property(holder_expr,
static_cast<int>(period_pos - holder_expr));
Handle<JSFunction> function = Handle<JSFunction>::cast(
GetProperty(global, factory->LookupSymbol(property)));
return Handle<JSObject>(JSObject::cast(function->prototype()));
}
static void InstallBuiltinFunctionId(Handle<JSObject> holder,
const char* function_name,
BuiltinFunctionId id) {
Factory* factory = holder->GetIsolate()->factory();
Handle<String> name = factory->LookupAsciiSymbol(function_name);
Object* function_object = holder->GetProperty(*name)->ToObjectUnchecked();
Handle<JSFunction> function(JSFunction::cast(function_object));
function->shared()->set_function_data(Smi::FromInt(id));
}
void Genesis::InstallBuiltinFunctionIds() {
HandleScope scope;
#define INSTALL_BUILTIN_ID(holder_expr, fun_name, name) \
{ \
Handle<JSObject> holder = ResolveBuiltinIdHolder( \
global_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, global_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
global_context()->set_jsfunction_result_caches(*caches);
}
void Genesis::InitializeNormalizedMapCaches() {
Handle<FixedArray> array(
FACTORY->NewFixedArray(NormalizedMapCache::kEntries, TENURED));
global_context()->set_normalized_map_cache(NormalizedMapCache::cast(*array));
}
bool Bootstrapper::InstallExtensions(Handle<Context> global_context,
v8::ExtensionConfiguration* extensions) {
Isolate* isolate = global_context->GetIsolate();
BootstrapperActive active;
SaveContext saved_context(isolate);
isolate->set_context(*global_context);
if (!Genesis::InstallExtensions(global_context, extensions)) return false;
Genesis::InstallSpecialObjects(global_context);
return true;
}
void Genesis::InstallSpecialObjects(Handle<Context> global_context) {
Isolate* isolate = global_context->GetIsolate();
Factory* factory = isolate->factory();
HandleScope scope;
Handle<JSGlobalObject> global(JSGlobalObject::cast(global_context->global()));
// 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->LookupAsciiSymbol(FLAG_expose_natives_as);
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
global, natives,
Handle<JSObject>(global->builtins()),
DONT_ENUM));
}
Handle<Object> Error = GetProperty(global, "Error");
if (Error->IsJSObject()) {
Handle<String> name = factory->LookupAsciiSymbol("stackTraceLimit");
Handle<Smi> stack_trace_limit(Smi::FromInt(FLAG_stack_trace_limit));
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
Handle<JSObject>::cast(Error), name,
stack_trace_limit, NONE));
}
#ifdef ENABLE_DEBUGGER_SUPPORT
// 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) {
Debug* debug = Isolate::Current()->debug();
// If loading fails we just bail out without installing the
// debugger but without tanking the whole context.
if (!debug->Load()) return;
// Set the security token for the debugger context to the same as
// the shell global context to allow calling between these (otherwise
// exposing debug global object doesn't make much sense).
debug->debug_context()->set_security_token(
global_context->security_token());
Handle<String> debug_string =
factory->LookupAsciiSymbol(FLAG_expose_debug_as);
Handle<Object> global_proxy(debug->debug_context()->global_proxy());
CHECK_NOT_EMPTY_HANDLE(isolate,
JSObject::SetLocalPropertyIgnoreAttributes(
global, debug_string, global_proxy, DONT_ENUM));
}
#endif
}
static uint32_t Hash(RegisteredExtension* extension) {
return v8::internal::ComputePointerHash(extension);
}
static bool MatchRegisteredExtensions(void* key1, void* key2) {
return key1 == key2;
}
Genesis::ExtensionStates::ExtensionStates()
: map_(MatchRegisteredExtensions, 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> global_context,
v8::ExtensionConfiguration* extensions) {
// TODO(isolates): Extensions on multiple isolates may take a little more
// effort. (The external API reads 'ignore'-- does that mean
// we can break the interface?)
ExtensionStates extension_states; // All extensions have state UNVISITED.
// Install auto extensions.
v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
while (current != NULL) {
if (current->extension()->auto_enable())
InstallExtension(current, &extension_states);
current = current->next();
}
if (FLAG_expose_gc) InstallExtension("v8/gc", &extension_states);
if (FLAG_expose_externalize_string) {
InstallExtension("v8/externalize", &extension_states);
}
if (extensions == NULL) return true;
// Install required extensions
int count = v8::ImplementationUtilities::GetNameCount(extensions);
const char** names = v8::ImplementationUtilities::GetNames(extensions);
for (int i = 0; i < count; i++) {
if (!InstallExtension(names[i], &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(const char* name,
ExtensionStates* extension_states) {
v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
// Loop until we find the relevant extension
while (current != NULL) {
if (strcmp(name, current->extension()->name()) == 0) break;
current = current->next();
}
// Didn't find the extension; fail.
if (current == NULL) {
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Cannot find required extension");
return false;
}
return InstallExtension(current, extension_states);
}
bool Genesis::InstallExtension(v8::RegisteredExtension* current,
ExtensionStates* extension_states) {
HandleScope scope;
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 (extension_states->get_state(current) == VISITED) {
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Circular extension dependency");
return false;
}
ASSERT(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(extension->dependencies()[i], extension_states))
return false;
}
Isolate* isolate = Isolate::Current();
Handle<String> source_code =
isolate->factory()->NewExternalStringFromAscii(extension->source());
bool result = CompileScriptCached(
CStrVector(extension->name()),
source_code,
isolate->bootstrapper()->extensions_cache(),
extension,
Handle<Context>(isolate->context()),
false);
ASSERT(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.
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;
Factory* factory = builtins->GetIsolate()->factory();
for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
Handle<String> name = factory->LookupAsciiSymbol(Builtins::GetName(id));
Object* function_object = builtins->GetPropertyNoExceptionThrown(*name);
Handle<JSFunction> function
= Handle<JSFunction>(JSFunction::cast(function_object));
builtins->set_javascript_builtin(id, *function);
if (!JSFunction::CompileLazy(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(global_context()->global_proxy()));
Handle<JSObject> inner_global(JSObject::cast(global_context()->global()));
if (!global_proxy_template.IsEmpty()) {
// Configure the global proxy object.
Handle<ObjectTemplateInfo> proxy_data =
v8::Utils::OpenHandle(*global_proxy_template);
if (!ConfigureApiObject(global_proxy, proxy_data)) return false;
// Configure the inner global object.
Handle<FunctionTemplateInfo> proxy_constructor(
FunctionTemplateInfo::cast(proxy_data->constructor()));
if (!proxy_constructor->prototype_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> inner_data(
ObjectTemplateInfo::cast(proxy_constructor->prototype_template()));
if (!ConfigureApiObject(inner_global, inner_data)) return false;
}
}
SetObjectPrototype(global_proxy, inner_global);
return true;
}
bool Genesis::ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template) {
ASSERT(!object_template.is_null());
ASSERT(object->IsInstanceOf(
FunctionTemplateInfo::cast(object_template->constructor())));
bool pending_exception = false;
Handle<JSObject> obj =
Execution::InstantiateObject(object_template, &pending_exception);
if (pending_exception) {
ASSERT(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 < descs->number_of_descriptors(); i++) {
PropertyDetails details = descs->GetDetails(i);
switch (details.type()) {
case FIELD: {
HandleScope inner;
Handle<String> key = Handle<String>(descs->GetKey(i));
int index = descs->GetFieldIndex(i);
Handle<Object> value = Handle<Object>(from->FastPropertyAt(index));
CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
JSObject::SetLocalPropertyIgnoreAttributes(
to, key, value, details.attributes()));
break;
}
case CONSTANT_FUNCTION: {
HandleScope inner;
Handle<String> key = Handle<String>(descs->GetKey(i));
Handle<JSFunction> fun =
Handle<JSFunction>(descs->GetConstantFunction(i));
CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
JSObject::SetLocalPropertyIgnoreAttributes(
to, key, fun, details.attributes()));
break;
}
case CALLBACKS: {
LookupResult result(isolate());
to->LocalLookup(descs->GetKey(i), &result);
// If the property is already there we skip it
if (result.IsFound()) continue;
HandleScope inner;
ASSERT(!to->HasFastProperties());
// Add to dictionary.
Handle<String> key = Handle<String>(descs->GetKey(i));
Handle<Object> callbacks(descs->GetCallbacksObject(i));
PropertyDetails d =
PropertyDetails(details.attributes(), CALLBACKS, details.index());
JSObject::SetNormalizedProperty(to, key, callbacks, d);
break;
}
case NORMAL:
// Do not occur since the from object has fast properties.
case HANDLER:
case INTERCEPTOR:
case TRANSITION:
case NONEXISTENT:
// No element in instance descriptors have proxy or interceptor type.
UNREACHABLE();
break;
}
}
} else {
Handle<StringDictionary> properties =
Handle<StringDictionary>(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)) {
ASSERT(raw_key->IsString());
// If the property is already there we skip it.
LookupResult result(isolate());
to->LocalLookup(String::cast(raw_key), &result);
if (result.IsFound()) continue;
// Set the property.
Handle<String> key = Handle<String>(String::cast(raw_key));
Handle<Object> value = Handle<Object>(properties->ValueAt(i));
if (value->IsJSGlobalPropertyCell()) {
value = Handle<Object>(JSGlobalPropertyCell::cast(*value)->value());
}
PropertyDetails details = properties->DetailsAt(i);
CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
JSObject::SetLocalPropertyIgnoreAttributes(
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;
Factory* factory = from->GetIsolate()->factory();
ASSERT(!from->IsJSArray());
ASSERT(!to->IsJSArray());
TransferNamedProperties(from, to);
TransferIndexedProperties(from, to);
// Transfer the prototype (new map is needed).
Handle<Map> old_to_map = Handle<Map>(to->map());
Handle<Map> new_to_map = factory->CopyMap(old_to_map);
new_to_map->set_prototype(from->map()->prototype());
to->set_map(*new_to_map);
}
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.
ASSERT(!function_instance_map_writable_prototype_.is_null());
ASSERT(!strict_mode_function_instance_map_writable_prototype_.is_null());
// Replace function instance maps to make prototype writable.
global_context()->set_function_map(
*function_instance_map_writable_prototype_);
global_context()->set_strict_mode_function_map(
*strict_mode_function_instance_map_writable_prototype_);
}
Genesis::Genesis(Isolate* isolate,
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) : isolate_(isolate) {
result_ = Handle<Context>::null();
// If V8 isn't running and cannot be initialized, just return.
if (!V8::IsRunning() && !V8::Initialize(NULL)) return;
// Before creating the roots we must save the context and restore it
// on all function exits.
HandleScope scope;
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::Current());
if (check.HasOverflowed()) return;
Handle<Context> new_context = Snapshot::NewContextFromSnapshot();
if (!new_context.is_null()) {
global_context_ =
Handle<Context>::cast(isolate->global_handles()->Create(*new_context));
AddToWeakGlobalContextList(*global_context_);
isolate->set_context(*global_context_);
isolate->counters()->contexts_created_by_snapshot()->Increment();
Handle<GlobalObject> inner_global;
Handle<JSGlobalProxy> global_proxy =
CreateNewGlobals(global_template,
global_object,
&inner_global);
HookUpGlobalProxy(inner_global, global_proxy);
HookUpInnerGlobal(inner_global);
if (!ConfigureGlobalObjects(global_template)) return;
} else {
// We get here if there was no context snapshot.
CreateRoots();
Handle<JSFunction> empty_function = CreateEmptyFunction(isolate);
CreateStrictModeFunctionMaps(empty_function);
Handle<GlobalObject> inner_global;
Handle<JSGlobalProxy> global_proxy =
CreateNewGlobals(global_template, global_object, &inner_global);
HookUpGlobalProxy(inner_global, global_proxy);
if (!InitializeGlobal(inner_global, empty_function)) return;
InstallJSFunctionResultCaches();
InitializeNormalizedMapCaches();
if (!InstallNatives()) return;
MakeFunctionInstancePrototypeWritable();
if (!ConfigureGlobalObjects(global_template)) return;
isolate->counters()->contexts_created_from_scratch()->Increment();
}
// Initialize experimental globals and install experimental natives.
InitializeExperimentalGlobal();
if (!InstallExperimentalNatives()) return;
result_ = global_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() {
ASSERT(!IsActive());
}
} } // namespace v8::internal