mirrored from https://chromium.googlesource.com/v8/v8.git
/
bootstrapper.cc
2626 lines (2272 loc) · 104 KB
/
bootstrapper.cc
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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"
#include "code-stubs.h"
namespace v8 {
namespace internal {
NativesExternalStringResource::NativesExternalStringResource(
Bootstrapper* bootstrapper,
const char* source,
size_t length)
: data_(source), length_(length) {
if (bootstrapper->delete_these_non_arrays_on_tear_down_ == NULL) {
bootstrapper->delete_these_non_arrays_on_tear_down_ = new List<char*>(2);
}
// The resources are small objects and we only make a fixed number of
// them, but let's clean them up on exit for neatness.
bootstrapper->delete_these_non_arrays_on_tear_down_->
Add(reinterpret_cast<char*>(this));
}
Bootstrapper::Bootstrapper(Isolate* isolate)
: isolate_(isolate),
nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION),
delete_these_non_arrays_on_tear_down_(NULL),
delete_these_arrays_on_tear_down_(NULL) {
}
Handle<String> Bootstrapper::NativesSourceLookup(int index) {
ASSERT(0 <= index && index < Natives::GetBuiltinsCount());
Heap* heap = isolate_->heap();
if (heap->natives_source_cache()->get(index)->IsUndefined()) {
// We can use external strings for the natives.
Vector<const char> source = Natives::GetRawScriptSource(index);
NativesExternalStringResource* resource =
new NativesExternalStringResource(this,
source.start(),
source.length());
Handle<String> source_code =
isolate_->factory()->NewExternalStringFromAscii(resource);
heap->natives_source_cache()->set(index, *source_code);
}
Handle<Object> cached_source(heap->natives_source_cache()->get(index),
isolate_);
return Handle<String>::cast(cached_source);
}
void Bootstrapper::Initialize(bool create_heap_objects) {
extensions_cache_.Initialize(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() { }
Isolate* isolate() const { return isolate_; }
Factory* factory() const { return isolate_->factory(); }
Heap* heap() const { return isolate_->heap(); }
Handle<Context> result() { return result_; }
private:
Handle<Context> native_context() { return native_context_; }
// Creates some basic objects. Used for creating a context from scratch.
void CreateRoots();
// Creates the empty function. Used for creating a context from scratch.
Handle<JSFunction> CreateEmptyFunction(Isolate* isolate);
// Creates the ThrowTypeError function. ECMA 5th Ed. 13.2.3
Handle<JSFunction> 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();
Handle<JSFunction> InstallInternalArray(Handle<JSBuiltinsObject> builtins,
const char* name,
ElementsKind elements_kind);
bool InstallNatives();
Handle<JSFunction> InstallTypedArray(const char* name);
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(Isolate* isolate,
const char* name,
ExtensionStates* extension_states);
static bool InstallExtension(Isolate* isolate,
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(Isolate* isolate,
Vector<const char> name,
Handle<String> source);
static bool CompileScriptCached(Isolate* isolate,
Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context);
Isolate* isolate_;
Handle<Context> result_;
Handle<Context> native_context_;
// Function 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(
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
HandleScope scope(isolate_);
Genesis genesis(isolate_, global_object, global_template, extensions);
Handle<Context> env = genesis.result();
if (env.is_null() || !InstallExtensions(env, extensions)) {
return Handle<Context>();
}
return scope.CloseAndEscape(env);
}
static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) {
// object.__proto__ = proto;
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> internalized_name = factory->InternalizeUtf8String(name);
Handle<Code> call_code = Handle<Code>(isolate->builtins()->builtin(call));
Handle<JSFunction> function = prototype.is_null() ?
factory->NewFunctionWithoutPrototype(internalized_name, call_code) :
factory->NewFunctionWithPrototype(internalized_name,
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, internalized_name, function, attributes));
if (is_ecma_native) {
function->shared()->set_instance_class_name(*internalized_name);
}
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(0, 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->set_instance_descriptors(*descriptors);
{ // Add length.
CallbacksDescriptor d(*factory()->length_string(), *length, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add name.
CallbacksDescriptor d(*factory()->name_string(), *name, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add arguments.
CallbacksDescriptor d(*factory()->arguments_string(), *args, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add caller.
CallbacksDescriptor d(*factory()->caller_string(), *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_string(), *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_string());
{ // --- 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> empty_string =
factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("Empty"));
Handle<JSFunction> empty_function =
factory->NewFunctionWithoutPrototype(empty_string, 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->NewStringFromOneByte(STATIC_ASCII_VECTOR("() {}"));
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(0, 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->set_instance_descriptors(*descriptors);
{ // Add length.
CallbacksDescriptor d(*factory()->length_string(), *length, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add name.
CallbacksDescriptor d(*factory()->name_string(), *name, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add arguments.
CallbacksDescriptor d(*factory()->arguments_string(), *arguments, attribs);
map->AppendDescriptor(&d, witness);
}
{ // Add caller.
CallbacksDescriptor d(*factory()->caller_string(), *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_string(), *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()->InternalizeOneByteString(
STATIC_ASCII_VECTOR("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->SearchWithCache(*name, *map);
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_string(), GetThrowTypeErrorFunction());
SetAccessors(map, factory()->caller_string(), 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_ = 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(),
isolate());
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_string());
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_string(),
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_string());
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()->InternalizeOneByteString(
STATIC_ASCII_VECTOR("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()->InternalizeOneByteString(
STATIC_ASCII_VECTOR("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_string());
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()->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(0, 1));
DescriptorArray::WhitenessWitness witness(*array_descriptors);
Handle<Foreign> array_length(factory->NewForeign(&Accessors::ArrayLength));
PropertyAttributes attribs = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE);
initial_map->set_instance_descriptors(*array_descriptors);
{ // Add length.
CallbacksDescriptor d(*factory->length_string(), *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);
if (FLAG_optimize_constructed_arrays) {
// Cache the array maps, needed by ArrayConstructorStub
CacheInitialJSArrayMaps(native_context(), initial_map);
ArrayConstructorStub array_constructor_stub(isolate);
Handle<Code> code = array_constructor_stub.GetCode(isolate);
array_function->shared()->set_construct_stub(*code);
} else {
array_function->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kCommonArrayConstructCode));
}
}
{ // --- 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(0, 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);
string_map->set_instance_descriptors(*string_descriptors);
{ // Add length.
CallbacksDescriptor d(*factory->length_string(), *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(0, 5);
DescriptorArray::WhitenessWitness witness(*descriptors);
initial_map->set_instance_descriptors(*descriptors);
{
// ECMA-262, section 15.10.7.1.
FieldDescriptor field(heap->source_string(),
JSRegExp::kSourceFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field, witness);
}
{
// ECMA-262, section 15.10.7.2.
FieldDescriptor field(heap->global_string(),
JSRegExp::kGlobalFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field, witness);
}
{
// ECMA-262, section 15.10.7.3.
FieldDescriptor field(heap->ignore_case_string(),
JSRegExp::kIgnoreCaseFieldIndex,
final,
Representation::Tagged());
initial_map->AppendDescriptor(&field, witness);