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ccc827a6f8
v8/src/bootstrapper.cc
rossberg@chromium.org ccc827a6f8 Allocate block-scoped global bindings to global context. 
- The global object has a reference to the current global scope chain.
  Running a script adds to the chain if it contains global lexical declarations.
- Scripts are executed relative to a global, not a native context.
- Harmony let and const bindings are allocated to the innermost global context;
  var and function still live on the global object.
  (Lexical bindings are not reflected on the global object at all,
  but that will probably change later using accessors, as for modules.)
- Compilation of scripts now needs a (global) context (previously only eval did).
- The global scope chain represents one logical scope, so collision tests take
  the chain into account.

R=svenpanne@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/10872084

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12398 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-08-28 11:25:08 +00:00

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// 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"
#include "extensions/statistics-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();
StatisticsExtension::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> native_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> 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> 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> native_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> native_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);
void SetFunctionInstanceDescriptor(Handle<Map> map,
PrototypePropertyMode prototypeMode);
void MakeFunctionInstancePrototypeWritable();
Handle<Map> CreateStrictModeFunctionMap(
PrototypePropertyMode prototype_mode,
Handle<JSFunction> empty_function);
void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
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();
Handle<JSGlobalProxy> global_proxy(JSGlobalProxy::cast(env->global_proxy()));
global_proxy->set_native_context(*factory->null_value());
SetObjectPrototype(global_proxy, factory->null_value());
env->set_global_proxy(env->global_object());
env->global_object()->set_global_receiver(env->global_object());
}
void Bootstrapper::ReattachGlobal(Handle<Context> env,
Handle<JSGlobalProxy> global_proxy) {
env->global_object()->set_global_receiver(*global_proxy);
env->set_global_proxy(*global_proxy);
SetObjectPrototype(global_proxy, Handle<JSObject>(env->global_object()));
global_proxy->set_native_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;
}
void Genesis::SetFunctionInstanceDescriptor(
Handle<Map> map, PrototypePropertyMode prototypeMode) {
int size = (prototypeMode == DONT_ADD_PROTOTYPE) ? 4 : 5;
Handle<DescriptorArray> descriptors(factory()->NewDescriptorArray(size));
DescriptorArray::WhitenessWitness witness(*descriptors);
Handle<Foreign> length(factory()->NewForeign(&Accessors::FunctionLength));
Handle<Foreign> name(factory()->NewForeign(&Accessors::FunctionName));
Handle<Foreign> args(factory()->NewForeign(&Accessors::FunctionArguments));
Handle<Foreign> caller(factory()->NewForeign(&Accessors::FunctionCaller));
Handle<Foreign> prototype;
if (prototypeMode != DONT_ADD_PROTOTYPE) {
prototype = factory()->NewForeign(&Accessors::FunctionPrototype);
}
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
Map::SetDescriptors(map, descriptors);
{ // Add length.
CallbacksDescriptor d(*factory()->length_symbol(), *length, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add name.
CallbacksDescriptor d(*factory()->name_symbol(), *name, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add arguments.
CallbacksDescriptor d(*factory()->arguments_symbol(), *args, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add caller.
CallbacksDescriptor d(*factory()->caller_symbol(), *caller, attribs);
map->AppendDescriptor(&d, witness);
}
if (prototypeMode != DONT_ADD_PROTOTYPE) {
// Add prototype.
if (prototypeMode == ADD_WRITEABLE_PROTOTYPE) {
attribs = static_cast<PropertyAttributes>(attribs & ~READ_ONLY);
}
CallbacksDescriptor d(*factory()->prototype_symbol(), *prototype, attribs);
map->AppendDescriptor(&d, witness);
}
}
Handle<Map> Genesis::CreateFunctionMap(PrototypePropertyMode prototype_mode) {
Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetFunctionInstanceDescriptor(map, prototype_mode);
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);
native_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);
native_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);
native_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);
native_context()->set_object_function(*object_fun);
// Allocate a new prototype for the object function.
Handle<JSObject> prototype = factory->NewJSObject(
isolate->object_function(),
TENURED);
native_context()->set_initial_object_prototype(*prototype);
SetPrototype(object_fun, prototype);
}
// 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.
native_context()->function_map()->set_prototype(*empty_function);
native_context()->function_instance_map()->set_prototype(*empty_function);
native_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(
native_context()->object_function()->prototype());
empty_function->set_map(*empty_function_map);
return empty_function;
}
void Genesis::SetStrictFunctionInstanceDescriptor(
Handle<Map> map, PrototypePropertyMode prototypeMode) {
int size = (prototypeMode == DONT_ADD_PROTOTYPE) ? 4 : 5;
Handle<DescriptorArray> descriptors(factory()->NewDescriptorArray(size));
DescriptorArray::WhitenessWitness witness(*descriptors);
Handle<Foreign> length(factory()->NewForeign(&Accessors::FunctionLength));
Handle<Foreign> name(factory()->NewForeign(&Accessors::FunctionName));
Handle<AccessorPair> arguments(factory()->NewAccessorPair());
Handle<AccessorPair> caller(factory()->NewAccessorPair());
Handle<Foreign> prototype;
if (prototypeMode != DONT_ADD_PROTOTYPE) {
prototype = factory()->NewForeign(&Accessors::FunctionPrototype);
}
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
Map::SetDescriptors(map, descriptors);
{ // Add length.
CallbacksDescriptor d(*factory()->length_symbol(), *length, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add name.
CallbacksDescriptor d(*factory()->name_symbol(), *name, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add arguments.
CallbacksDescriptor d(*factory()->arguments_symbol(), *arguments, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add caller.
CallbacksDescriptor d(*factory()->caller_symbol(), *caller, attribs);
map->AppendDescriptor(&d, witness);
}
if (prototypeMode != DONT_ADD_PROTOTYPE) {
// Add prototype.
if (prototypeMode != ADD_WRITEABLE_PROTOTYPE) {
attribs = static_cast<PropertyAttributes>(attribs | READ_ONLY);
}
CallbacksDescriptor d(*factory()->prototype_symbol(), *prototype, attribs);
map->AppendDescriptor(&d, witness);
}
}
// 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(
native_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);
SetStrictFunctionInstanceDescriptor(map, prototype_mode);
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);
native_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);
native_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);
native_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 AddToWeakNativeContextList(Context* context) {
ASSERT(context->IsNativeContext());
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->native_contexts_list();
!current->IsUndefined();
current = Context::cast(current)->get(Context::NEXT_CONTEXT_LINK)) {
ASSERT(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_ = Handle<Context>::cast(isolate()->global_handles()->Create(
*factory()->NewNativeContext()));
AddToWeakNativeContextList(*native_context_);
isolate()->set_context(*native_context());
// Allocate the message listeners object.
{
v8::NeanderArray listeners;
native_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();
js_global_function->initial_map()->set_dictionary_map(true);
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 native context for the global object.
inner_global->set_native_context(*native_context());
inner_global->set_global_context(*native_context());
inner_global->set_global_receiver(*global_proxy);
global_proxy->set_native_context(*native_context());
native_context()->set_global_proxy(*global_proxy);
}
void Genesis::HookUpInnerGlobal(Handle<GlobalObject> inner_global) {
Handle<GlobalObject> inner_global_from_snapshot(
GlobalObject::cast(native_context_->extension()));
Handle<JSBuiltinsObject> builtins_global(native_context_->builtins());
native_context_->set_extension(*inner_global);
native_context_->set_global_object(*inner_global);
native_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).
native_context()->set_closure(*empty_function);
native_context()->set_previous(NULL);
// Set extension and global object.
native_context()->set_extension(*inner_global);
native_context()->set_global_object(*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.
native_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>(native_context()->global_object());
// 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<Map> initial_map(array_function->initial_map());
Handle<DescriptorArray> array_descriptors(factory->NewDescriptorArray(1));
DescriptorArray::WhitenessWitness witness(*array_descriptors);
Handle<Foreign> array_length(factory->NewForeign(&Accessors::ArrayLength));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
Map::SetDescriptors(initial_map, array_descriptors);
{ // Add length.
CallbacksDescriptor d(*factory->length_symbol(), *array_length, attribs);
array_function->initial_map()->AppendDescriptor(&d, witness);
}
// 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);
}
{ // --- 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);
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, true);
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, true);
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());
Handle<DescriptorArray> string_descriptors(factory->NewDescriptorArray(1));
DescriptorArray::WhitenessWitness witness(*string_descriptors);
Handle<Foreign> string_length(
factory->NewForeign(&Accessors::StringLength));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
Map::SetDescriptors(string_map, string_descriptors);
{ // Add length.
CallbacksDescriptor d(*factory->length_symbol(), *string_length, attribs);
string_map->AppendDescriptor(&d, witness);
}
}
{ // --- 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);
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, true);
native_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());
PropertyAttributes final =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(5);
DescriptorArray::WhitenessWitness witness(*descriptors);
Map::SetDescriptors(initial_map, descriptors);
{
// ECMA-262, section 15.10.7.1.
FieldDescriptor field(heap->source_symbol(),
JSRegExp::kSourceFieldIndex,
final);
initial_map->AppendDescriptor(&field, witness);
}
{
// ECMA-262, section 15.10.7.2.
FieldDescriptor field(heap->global_symbol(),
JSRegExp::kGlobalFieldIndex,
final);
initial_map->AppendDescriptor(&field, witness);
}
{
// ECMA-262, section 15.10.7.3.
FieldDescriptor field(heap->ignore_case_symbol(),
JSRegExp::kIgnoreCaseFieldIndex,
final);
initial_map->AppendDescriptor(&field, witness);
}
{
// ECMA-262, section 15.10.7.4.
FieldDescriptor field(heap->multiline_symbol(),
JSRegExp::kMultilineFieldIndex,
final);
initial_map->AppendDescriptor(&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);
initial_map->AppendDescriptor(&field, 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_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(native_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(
native_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));
native_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(native_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);
native_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(native_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());
native_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 map. Allocate one in-object field for length.
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE,
Heap::kArgumentsObjectSizeStrict);
// Create the descriptor array for the arguments object.
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(3);
DescriptorArray::WhitenessWitness witness(*descriptors);
Map::SetDescriptors(map, descriptors);
{ // length
FieldDescriptor d(*factory->length_symbol(), 0, DONT_ENUM);
map->AppendDescriptor(&d, witness);
}
{ // callee
CallbacksDescriptor d(*factory->callee_symbol(),
*callee,
attributes);
map->AppendDescriptor(&d, witness);
}
{ // caller
CallbacksDescriptor d(*factory->caller_symbol(),
*caller,
attributes);
map->AppendDescriptor(&d, witness);
}
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 non-strict arguments boilerplate.
map->set_constructor(
native_context()->arguments_boilerplate()->map()->constructor());
// Allocate the arguments boilerplate object.
Handle<JSObject> result = factory->NewJSObjectFromMap(map);
native_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);
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_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
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_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
native_context()->set_call_as_constructor_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
// Initialize the out of memory slot.
native_context()->set_out_of_memory(heap->false_value());
// Initialize the data slot.
native_context()->set_data(heap->undefined_value());
{
// Initialize the random seed slot.
Handle<ByteArray> zeroed_byte_array(
factory->NewByteArray(kRandomStateSize));
native_context()->set_random_seed(*zeroed_byte_array);
memset(zeroed_byte_array->GetDataStartAddress(), 0, kRandomStateSize);
}
return true;
}
void Genesis::InitializeExperimentalGlobal() {
Handle<JSObject> global = Handle<JSObject>(native_context()->global_object());
// 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,
top_context,
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->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());
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 = \
native_context()->builtins()->GetPropertyNoExceptionThrown( \
*var##_name); \
native_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 native_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);
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_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(native_context()->global_object());
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(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_symbol(),
factory()->undefined_value());
ASSERT(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, false);
Handle<JSObject> prototype =
factory()->NewJSObject(isolate()->object_function(), TENURED);
SetPrototype(script_fun, prototype);
native_context()->set_script_function(*script_fun);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
Handle<DescriptorArray> script_descriptors(
factory()->NewDescriptorArray(13));
DescriptorArray::WhitenessWitness witness(*script_descriptors);
Handle<Foreign> script_source(
factory()->NewForeign(&Accessors::ScriptSource));
Handle<Foreign> script_name(factory()->NewForeign(&Accessors::ScriptName));
Handle<String> id_symbol(factory()->LookupAsciiSymbol("id"));
Handle<Foreign> script_id(factory()->NewForeign(&Accessors::ScriptId));
Handle<String> line_offset_symbol(
factory()->LookupAsciiSymbol("line_offset"));
Handle<Foreign> script_line_offset(
factory()->NewForeign(&Accessors::ScriptLineOffset));
Handle<String> column_offset_symbol(
factory()->LookupAsciiSymbol("column_offset"));
Handle<Foreign> script_column_offset(
factory()->NewForeign(&Accessors::ScriptColumnOffset));
Handle<String> data_symbol(factory()->LookupAsciiSymbol("data"));
Handle<Foreign> script_data(factory()->NewForeign(&Accessors::ScriptData));
Handle<String> type_symbol(factory()->LookupAsciiSymbol("type"));
Handle<Foreign> script_type(factory()->NewForeign(&Accessors::ScriptType));
Handle<String> compilation_type_symbol(
factory()->LookupAsciiSymbol("compilation_type"));
Handle<Foreign> script_compilation_type(
factory()->NewForeign(&Accessors::ScriptCompilationType));
Handle<String> line_ends_symbol(factory()->LookupAsciiSymbol("line_ends"));
Handle<Foreign> script_line_ends(
factory()->NewForeign(&Accessors::ScriptLineEnds));
Handle<String> context_data_symbol(
factory()->LookupAsciiSymbol("context_data"));
Handle<Foreign> script_context_data(
factory()->NewForeign(&Accessors::ScriptContextData));
Handle<String> eval_from_script_symbol(
factory()->LookupAsciiSymbol("eval_from_script"));
Handle<Foreign> script_eval_from_script(
factory()->NewForeign(&Accessors::ScriptEvalFromScript));
Handle<String> eval_from_script_position_symbol(
factory()->LookupAsciiSymbol("eval_from_script_position"));
Handle<Foreign> script_eval_from_script_position(
factory()->NewForeign(&Accessors::ScriptEvalFromScriptPosition));
Handle<String> eval_from_function_name_symbol(
factory()->LookupAsciiSymbol("eval_from_function_name"));
Handle<Foreign> script_eval_from_function_name(
factory()->NewForeign(&Accessors::ScriptEvalFromFunctionName));
PropertyAttributes attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Map::SetDescriptors(script_map, script_descriptors);
{
CallbacksDescriptor d(
*factory()->source_symbol(), *script_source, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*factory()->name_symbol(), *script_name, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*id_symbol, *script_id, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*line_offset_symbol, *script_line_offset, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*column_offset_symbol, *script_column_offset, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*data_symbol, *script_data, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*type_symbol, *script_type, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*compilation_type_symbol, *script_compilation_type, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(*line_ends_symbol, *script_line_ends, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*context_data_symbol, *script_context_data, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*eval_from_script_symbol, *script_eval_from_script, attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*eval_from_script_position_symbol,
*script_eval_from_script_position,
attribs);
script_map->AppendDescriptor(&d, witness);
}
{
CallbacksDescriptor d(
*eval_from_function_name_symbol,
*script_eval_from_function_name,
attribs);
script_map->AppendDescriptor(&d, witness);
}
// 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);
native_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();
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<Map> initial_map(array_function->initial_map());
Handle<DescriptorArray> array_descriptors(factory()->NewDescriptorArray(1));
DescriptorArray::WhitenessWitness witness(*array_descriptors);
Handle<Foreign> array_length(factory()->NewForeign(
&Accessors::ArrayLength));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
Map::SetDescriptors(initial_map, array_descriptors);
{ // Add length.
CallbacksDescriptor d(
*factory()->length_symbol(), *array_length, attribs);
array_function->initial_map()->AppendDescriptor(&d, witness);
}
native_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(native_context()->string_function());
ASSERT(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_class_symbol();
Handle<JSFunction> function =
Handle<JSFunction>::cast(GetProperty(isolate()->global_object(), 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(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".
Handle<DescriptorArray> reresult_descriptors =
factory()->NewDescriptorArray(3);
DescriptorArray::WhitenessWitness witness(*reresult_descriptors);
Map::SetDescriptors(initial_map, reresult_descriptors);
{
JSFunction* array_function = native_context()->array_function();
Handle<DescriptorArray> array_descriptors(
array_function->initial_map()->instance_descriptors());
String* length = heap()->length_symbol();
int old = array_descriptors->SearchWithCache(length);
ASSERT(old != DescriptorArray::kNotFound);
CallbacksDescriptor desc(length,
array_descriptors->GetValue(old),
array_descriptors->GetDetails(old).attributes());
initial_map->AppendDescriptor(&desc, witness);
}
{
FieldDescriptor index_field(heap()->index_symbol(),
JSRegExpResult::kIndexIndex,
NONE);
initial_map->AppendDescriptor(&index_field, witness);
}
{
FieldDescriptor input_field(heap()->input_symbol(),
JSRegExpResult::kInputIndex,
NONE);
initial_map->AppendDescriptor(&input_field, witness);
}
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);
}
#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> native_context,
const char* holder_expr) {
Factory* factory = native_context->GetIsolate()->factory();
Handle<GlobalObject> global(native_context->global_object());
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( \
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<FixedArray> array(
FACTORY->NewFixedArray(NormalizedMapCache::kEntries, TENURED));
native_context()->set_normalized_map_cache(NormalizedMapCache::cast(*array));
}
bool Bootstrapper::InstallExtensions(Handle<Context> native_context,
v8::ExtensionConfiguration* extensions) {
Isolate* isolate = native_context->GetIsolate();
BootstrapperActive active;
SaveContext saved_context(isolate);
isolate->set_context(*native_context);
if (!Genesis::InstallExtensions(native_context, extensions)) return false;
Genesis::InstallSpecialObjects(native_context);
return true;
}
void Genesis::InstallSpecialObjects(Handle<Context> native_context) {
Isolate* isolate = native_context->GetIsolate();
Factory* factory = isolate->factory();
HandleScope scope;
Handle<JSGlobalObject> global(JSGlobalObject::cast(
native_context->global_object()));
// 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 native context to allow calling between these (otherwise
// exposing debug global object doesn't make much sense).
debug->debug_context()->set_security_token(
native_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> native_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 (FLAG_track_gc_object_stats) {
InstallExtension("v8/statistics", &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(native_context()->global_proxy()));
Handle<JSObject> inner_global(
JSObject::cast(native_context()->global_object()));
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.descriptor_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.
native_context()->set_function_map(
*function_instance_map_writable_prototype_);
native_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()) {
native_context_ =
Handle<Context>::cast(isolate->global_handles()->Create(*new_context));
AddToWeakNativeContextList(*native_context_);
isolate->set_context(*native_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_ = 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() {
ASSERT(!IsActive());
}
} } // namespace v8::internal
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