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v8/src/bootstrapper.cc
sgjesse@chromium.org 677c043fee Handle array construction on native code. 
The construction of arrays when using the the Array function either as a constructor or a normal function is now handled fully in generated code in most cases. Only when Array is called with one argument which is either negative or abowe JSObject::kInitialMaxFastElementArray (which is currently 1000) or if the allocated object cannot fit in the room left in new space is the runtime system entered.

Two new native code built-in functions are added one for normal invocation and one for the construct call. The existing C++ builtin is renamed, but kept. When the normal invocation cannot be handled in generated code the C++ builtin is called. When the construct invocation cannot be handled in native code the generic construct stub is called (which will end up in the C++ builtin through a construct trampoline).

One thing that might be changed is preserving esi (constructor function) during the handling of a construct call. We know precisily what function we where calling anyway and can just reload it. This could remove the parameter construct_call to ArrayNativeCode and remove the handling of this from that function.

The X64 and ARM implementations are not part of this changelist.
Review URL: http://codereview.chromium.org/193125

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2899 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-09-16 11:17:57 +00:00

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// Copyright 2006-2008 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 "macro-assembler.h"
#include "natives.h"
namespace v8 {
namespace internal {
// A SourceCodeCache uses a FixedArray to store pairs of
// (AsciiString*, JSFunction*), mapping names of native code files
// (runtime.js, etc.) to precompiled functions. Instead of mapping
// names to functions it might make sense to let the JS2C tool
// generate an index for each native JS file.
class SourceCodeCache BASE_EMBEDDED {
public:
explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
void Initialize(bool create_heap_objects) {
cache_ = create_heap_objects ? Heap::empty_fixed_array() : NULL;
}
void Iterate(ObjectVisitor* v) {
v->VisitPointer(bit_cast<Object**, FixedArray**>(&cache_));
}
bool Lookup(Vector<const char> name, Handle<JSFunction>* handle) {
for (int i = 0; i < cache_->length(); i+=2) {
SeqAsciiString* str = SeqAsciiString::cast(cache_->get(i));
if (str->IsEqualTo(name)) {
*handle = Handle<JSFunction>(JSFunction::cast(cache_->get(i + 1)));
return true;
}
}
return false;
}
void Add(Vector<const char> name, Handle<JSFunction> fun) {
ASSERT(fun->IsBoilerplate());
HandleScope scope;
int length = cache_->length();
Handle<FixedArray> new_array =
Factory::NewFixedArray(length + 2, TENURED);
cache_->CopyTo(0, *new_array, 0, cache_->length());
cache_ = *new_array;
Handle<String> str = Factory::NewStringFromAscii(name, TENURED);
cache_->set(length, *str);
cache_->set(length + 1, *fun);
Script::cast(fun->shared()->script())->set_type(Smi::FromInt(type_));
}
private:
Script::Type type_;
FixedArray* cache_;
DISALLOW_COPY_AND_ASSIGN(SourceCodeCache);
};
static SourceCodeCache natives_cache(Script::TYPE_NATIVE);
static SourceCodeCache extensions_cache(Script::TYPE_EXTENSION);
Handle<String> Bootstrapper::NativesSourceLookup(int index) {
ASSERT(0 <= index && index < Natives::GetBuiltinsCount());
if (Heap::natives_source_cache()->get(index)->IsUndefined()) {
Handle<String> source_code =
Factory::NewStringFromAscii(Natives::GetScriptSource(index));
Heap::natives_source_cache()->set(index, *source_code);
}
Handle<Object> cached_source(Heap::natives_source_cache()->get(index));
return Handle<String>::cast(cached_source);
}
bool Bootstrapper::NativesCacheLookup(Vector<const char> name,
Handle<JSFunction>* handle) {
return natives_cache.Lookup(name, handle);
}
void Bootstrapper::NativesCacheAdd(Vector<const char> name,
Handle<JSFunction> fun) {
natives_cache.Add(name, fun);
}
void Bootstrapper::Initialize(bool create_heap_objects) {
natives_cache.Initialize(create_heap_objects);
extensions_cache.Initialize(create_heap_objects);
}
void Bootstrapper::TearDown() {
natives_cache.Initialize(false); // Yes, symmetrical
extensions_cache.Initialize(false);
}
// Pending fixups are code positions that refer to builtin code
// objects that were not available at the time the code was generated.
// The pending list is processed whenever an environment has been
// created.
class PendingFixups : public AllStatic {
public:
static void Add(Code* code, MacroAssembler* masm);
static bool Process(Handle<JSBuiltinsObject> builtins);
static void Iterate(ObjectVisitor* v);
private:
static List<Object*> code_;
static List<const char*> name_;
static List<int> pc_;
static List<uint32_t> flags_;
static void Clear();
};
List<Object*> PendingFixups::code_(0);
List<const char*> PendingFixups::name_(0);
List<int> PendingFixups::pc_(0);
List<uint32_t> PendingFixups::flags_(0);
void PendingFixups::Add(Code* code, MacroAssembler* masm) {
// Note this code is not only called during bootstrapping.
List<MacroAssembler::Unresolved>* unresolved = masm->unresolved();
int n = unresolved->length();
for (int i = 0; i < n; i++) {
const char* name = unresolved->at(i).name;
code_.Add(code);
name_.Add(name);
pc_.Add(unresolved->at(i).pc);
flags_.Add(unresolved->at(i).flags);
LOG(StringEvent("unresolved", name));
}
}
bool PendingFixups::Process(Handle<JSBuiltinsObject> builtins) {
HandleScope scope;
// NOTE: Extra fixups may be added to the list during the iteration
// due to lazy compilation of functions during the processing. Do not
// cache the result of getting the length of the code list.
for (int i = 0; i < code_.length(); i++) {
const char* name = name_[i];
uint32_t flags = flags_[i];
Handle<String> symbol = Factory::LookupAsciiSymbol(name);
Object* o = builtins->GetProperty(*symbol);
#ifdef DEBUG
if (!o->IsJSFunction()) {
V8_Fatal(__FILE__, __LINE__, "Cannot resolve call to builtin %s", name);
}
#endif
Handle<JSFunction> f = Handle<JSFunction>(JSFunction::cast(o));
// Make sure the number of parameters match the formal parameter count.
int argc = Bootstrapper::FixupFlagsArgumentsCount::decode(flags);
USE(argc);
ASSERT(f->shared()->formal_parameter_count() == argc);
if (!f->is_compiled()) {
// Do lazy compilation and check for stack overflows.
if (!CompileLazy(f, CLEAR_EXCEPTION)) {
Clear();
return false;
}
}
Code* code = Code::cast(code_[i]);
Address pc = code->instruction_start() + pc_[i];
bool is_pc_relative = Bootstrapper::FixupFlagsIsPCRelative::decode(flags);
bool use_code_object = Bootstrapper::FixupFlagsUseCodeObject::decode(flags);
if (use_code_object) {
if (is_pc_relative) {
Assembler::set_target_address_at(
pc, reinterpret_cast<Address>(f->code()));
} else {
*reinterpret_cast<Object**>(pc) = f->code();
}
} else {
Assembler::set_target_address_at(pc, f->code()->instruction_start());
}
LOG(StringEvent("resolved", name));
}
Clear();
// TODO(1240818): We should probably try to avoid doing this for all
// the V8 builtin JS files. It should only happen after running
// runtime.js - just like there shouldn't be any fixups left after
// that.
for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
Handle<String> name = Factory::LookupAsciiSymbol(Builtins::GetName(id));
JSFunction* function = JSFunction::cast(builtins->GetProperty(*name));
builtins->set_javascript_builtin(id, function);
}
return true;
}
void PendingFixups::Clear() {
code_.Clear();
name_.Clear();
pc_.Clear();
flags_.Clear();
}
void PendingFixups::Iterate(ObjectVisitor* v) {
if (!code_.is_empty()) {
v->VisitPointers(&code_[0], &code_[0] + code_.length());
}
}
class Genesis BASE_EMBEDDED {
public:
Genesis(Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions);
~Genesis();
Handle<Context> result() { return result_; }
Genesis* previous() { return previous_; }
static Genesis* current() { return current_; }
// Support for thread preemption.
static int ArchiveSpacePerThread();
static char* ArchiveState(char* to);
static char* RestoreState(char* from);
private:
Handle<Context> global_context_;
// 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_;
static Genesis* current_;
Handle<Context> global_context() { return global_context_; }
void CreateRoots(v8::Handle<v8::ObjectTemplate> global_template,
Handle<Object> global_object);
void InstallNativeFunctions();
bool InstallNatives();
bool InstallExtensions(v8::ExtensionConfiguration* extensions);
bool InstallExtension(const char* name);
bool InstallExtension(v8::RegisteredExtension* current);
bool InstallSpecialObjects();
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);
Handle<DescriptorArray> ComputeFunctionInstanceDescriptor(
bool make_prototype_read_only,
bool make_prototype_enumerable = false);
void MakeFunctionInstancePrototypeWritable();
void AddSpecialFunction(Handle<JSObject> prototype,
const char* name,
Handle<Code> code);
void BuildSpecialFunctionTable();
static bool CompileBuiltin(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,
bool use_runtime_context);
Handle<Context> result_;
};
Genesis* Genesis::current_ = NULL;
void Bootstrapper::Iterate(ObjectVisitor* v) {
natives_cache.Iterate(v);
extensions_cache.Iterate(v);
PendingFixups::Iterate(v);
}
// While setting up the environment, we collect code positions that
// need to be patched before we can run any code in the environment.
void Bootstrapper::AddFixup(Code* code, MacroAssembler* masm) {
PendingFixups::Add(code, masm);
}
bool Bootstrapper::IsActive() {
return Genesis::current() != NULL;
}
Handle<Context> Bootstrapper::CreateEnvironment(
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
Genesis genesis(global_object, global_template, extensions);
return genesis.result();
}
static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) {
// object.__proto__ = proto;
Handle<Map> old_to_map = Handle<Map>(object->map());
Handle<Map> new_to_map = Factory::CopyMapDropTransitions(old_to_map);
new_to_map->set_prototype(*proto);
object->set_map(*new_to_map);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
JSGlobalProxy::cast(env->global_proxy())->set_context(*Factory::null_value());
SetObjectPrototype(Handle<JSObject>(env->global_proxy()),
Factory::null_value());
env->set_global_proxy(env->global());
env->global()->set_global_receiver(env->global());
}
Genesis::~Genesis() {
ASSERT(current_ == this);
current_ = previous_;
}
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) {
Handle<String> symbol = Factory::LookupAsciiSymbol(name);
Handle<Code> call_code = Handle<Code>(Builtins::builtin(call));
Handle<JSFunction> function =
Factory::NewFunctionWithPrototype(symbol,
type,
instance_size,
prototype,
call_code,
is_ecma_native);
SetProperty(target, symbol, function, DONT_ENUM);
if (is_ecma_native) {
function->shared()->set_instance_class_name(*symbol);
}
return function;
}
Handle<DescriptorArray> Genesis::ComputeFunctionInstanceDescriptor(
bool make_prototype_read_only,
bool make_prototype_enumerable) {
Handle<DescriptorArray> result = Factory::empty_descriptor_array();
// Add prototype.
PropertyAttributes attributes = static_cast<PropertyAttributes>(
(make_prototype_enumerable ? 0 : DONT_ENUM)
| DONT_DELETE
| (make_prototype_read_only ? READ_ONLY : 0));
result =
Factory::CopyAppendProxyDescriptor(
result,
Factory::prototype_symbol(),
Factory::NewProxy(&Accessors::FunctionPrototype),
attributes);
attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
// Add length.
result =
Factory::CopyAppendProxyDescriptor(
result,
Factory::length_symbol(),
Factory::NewProxy(&Accessors::FunctionLength),
attributes);
// Add name.
result =
Factory::CopyAppendProxyDescriptor(
result,
Factory::name_symbol(),
Factory::NewProxy(&Accessors::FunctionName),
attributes);
// Add arguments.
result =
Factory::CopyAppendProxyDescriptor(
result,
Factory::arguments_symbol(),
Factory::NewProxy(&Accessors::FunctionArguments),
attributes);
// Add caller.
result =
Factory::CopyAppendProxyDescriptor(
result,
Factory::caller_symbol(),
Factory::NewProxy(&Accessors::FunctionCaller),
attributes);
return result;
}
void Genesis::CreateRoots(v8::Handle<v8::ObjectTemplate> global_template,
Handle<Object> global_object) {
HandleScope scope;
// Allocate the global context FixedArray first and then patch the
// closure and extension object later (we need the empty function
// and the global object, but in order to create those, we need the
// global context).
global_context_ =
Handle<Context>::cast(
GlobalHandles::Create(*Factory::NewGlobalContext()));
Top::set_context(*global_context());
// Allocate the message listeners object.
v8::NeanderArray listeners;
global_context()->set_message_listeners(*listeners.value());
// Allocate the map for function instances.
Handle<Map> fm = Factory::NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
global_context()->set_function_instance_map(*fm);
// Please note that the prototype property for function instances must be
// writable.
Handle<DescriptorArray> function_map_descriptors =
ComputeFunctionInstanceDescriptor(false, false);
fm->set_instance_descriptors(*function_map_descriptors);
// Allocate the function map first and then patch the prototype later
fm = Factory::NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
global_context()->set_function_map(*fm);
function_map_descriptors = ComputeFunctionInstanceDescriptor(true);
fm->set_instance_descriptors(*function_map_descriptors);
Handle<String> object_name = Handle<String>(Heap::Object_symbol());
{ // --- O b j e c t ---
Handle<JSFunction> object_fun =
Factory::NewFunction(object_name, Factory::null_value());
Handle<Map> object_function_map =
Factory::NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
object_fun->set_initial_map(*object_function_map);
object_function_map->set_constructor(*object_fun);
global_context()->set_object_function(*object_fun);
// Allocate a new prototype for the object function.
Handle<JSObject> prototype = Factory::NewJSObject(Top::object_function(),
TENURED);
global_context()->set_initial_object_prototype(*prototype);
SetPrototype(object_fun, prototype);
object_function_map->
set_instance_descriptors(Heap::empty_descriptor_array());
}
// Allocate the empty function as the prototype for function ECMAScript
// 262 15.3.4.
Handle<String> symbol = Factory::LookupAsciiSymbol("Empty");
Handle<JSFunction> empty_function =
Factory::NewFunction(symbol, Factory::null_value());
{ // --- E m p t y ---
Handle<Code> code =
Handle<Code>(Builtins::builtin(Builtins::EmptyFunction));
empty_function->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();
global_context()->function_map()->set_prototype(*empty_function);
global_context()->function_instance_map()->set_prototype(*empty_function);
// Allocate the function map first and then patch the prototype later
Handle<Map> empty_fm = Factory::CopyMapDropDescriptors(fm);
empty_fm->set_instance_descriptors(*function_map_descriptors);
empty_fm->set_prototype(global_context()->object_function()->prototype());
empty_function->set_map(*empty_fm);
}
{ // --- G l o b a l ---
// Step 1: create a fresh inner JSGlobalObject
Handle<GlobalObject> object;
{
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>(Builtins::builtin(Builtins::Illegal));
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()));
SetProperty(prototype, Factory::constructor_symbol(),
Top::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();
object = Factory::NewGlobalObject(js_global_function);
}
// Set the global context for the global object.
object->set_global_context(*global_context());
// Step 2: create or re-initialize the global proxy object.
Handle<JSGlobalProxy> global_proxy;
{
Handle<JSFunction> global_proxy_function;
if (global_template.IsEmpty()) {
Handle<String> name = Handle<String>(Heap::empty_symbol());
Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal));
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
if (global_object.location() != NULL) {
ASSERT(global_object->IsJSGlobalProxy());
global_proxy =
ReinitializeJSGlobalProxy(
global_proxy_function,
Handle<JSGlobalProxy>::cast(global_object));
} else {
global_proxy = Handle<JSGlobalProxy>::cast(
Factory::NewJSObject(global_proxy_function, TENURED));
}
// 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.
object->set_global_receiver(*global_proxy);
global_proxy->set_context(*global_context());
}
{ // --- G l o b a l C o n t e x t ---
// use the empty function as closure (no scope info)
global_context()->set_closure(*empty_function);
global_context()->set_fcontext(*global_context());
global_context()->set_previous(NULL);
// set extension and global object
global_context()->set_extension(*object);
global_context()->set_global(*object);
global_context()->set_global_proxy(*global_proxy);
// use inner global object as security token by default
global_context()->set_security_token(*object);
}
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
SetProperty(global, object_name, Top::object_function(), DONT_ENUM);
}
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
// Install global Function object
InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
empty_function, Builtins::Illegal, true); // ECMA native.
{ // --- A r r a y ---
Handle<JSFunction> array_function =
InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
Top::initial_object_prototype(), Builtins::ArrayCode,
true);
array_function->shared()->set_construct_stub(
Builtins::builtin(Builtins::ArrayConstructCode));
array_function->shared()->DontAdaptArguments();
// This seems a bit hackish, but we need to make sure Array.length
// is 1.
array_function->shared()->set_length(1);
Handle<DescriptorArray> array_descriptors =
Factory::CopyAppendProxyDescriptor(
Factory::empty_descriptor_array(),
Factory::length_symbol(),
Factory::NewProxy(&Accessors::ArrayLength),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE));
// Cache the fast JavaScript array map
global_context()->set_js_array_map(array_function->initial_map());
global_context()->js_array_map()->set_instance_descriptors(
*array_descriptors);
// array_function is used internally. JS code creating array object should
// search for the 'Array' property on the global object and use that one
// as the constructor. 'Array' property on a global object can be
// overwritten by JS code.
global_context()->set_array_function(*array_function);
}
{ // --- N u m b e r ---
Handle<JSFunction> number_fun =
InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
true);
global_context()->set_number_function(*number_fun);
}
{ // --- B o o l e a n ---
Handle<JSFunction> boolean_fun =
InstallFunction(global, "Boolean", JS_VALUE_TYPE, JSValue::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
true);
global_context()->set_boolean_function(*boolean_fun);
}
{ // --- S t r i n g ---
Handle<JSFunction> string_fun =
InstallFunction(global, "String", JS_VALUE_TYPE, JSValue::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
true);
global_context()->set_string_function(*string_fun);
// Add 'length' property to strings.
Handle<DescriptorArray> string_descriptors =
Factory::CopyAppendProxyDescriptor(
Factory::empty_descriptor_array(),
Factory::length_symbol(),
Factory::NewProxy(&Accessors::StringLength),
static_cast<PropertyAttributes>(DONT_ENUM |
DONT_DELETE |
READ_ONLY));
Handle<Map> string_map =
Handle<Map>(global_context()->string_function()->initial_map());
string_map->set_instance_descriptors(*string_descriptors);
}
{ // --- D a t e ---
// Builtin functions for Date.prototype.
Handle<JSFunction> date_fun =
InstallFunction(global, "Date", JS_VALUE_TYPE, JSValue::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
true);
global_context()->set_date_function(*date_fun);
}
{ // -- R e g E x p
// Builtin functions for RegExp.prototype.
Handle<JSFunction> regexp_fun =
InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
true);
global_context()->set_regexp_function(*regexp_fun);
}
{ // -- J S O N
Handle<String> name = Factory::NewStringFromAscii(CStrVector("JSON"));
Handle<JSFunction> cons = Factory::NewFunction(
name,
Factory::the_hole_value());
cons->SetInstancePrototype(global_context()->initial_object_prototype());
cons->SetInstanceClassName(*name);
Handle<JSObject> json_object = Factory::NewJSObject(cons, TENURED);
ASSERT(json_object->IsJSObject());
SetProperty(global, name, json_object, DONT_ENUM);
global_context()->set_json_object(*json_object);
}
{ // --- arguments_boilerplate_
// Make sure we can recognize argument objects at runtime.
// This is done by introducing an anonymous function with
// class_name equals 'Arguments'.
Handle<String> symbol = Factory::LookupAsciiSymbol("Arguments");
Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal));
Handle<JSObject> prototype =
Handle<JSObject>(
JSObject::cast(global_context()->object_function()->prototype()));
Handle<JSFunction> function =
Factory::NewFunctionWithPrototype(symbol,
JS_OBJECT_TYPE,
JSObject::kHeaderSize,
prototype,
code,
false);
ASSERT(!function->has_initial_map());
function->shared()->set_instance_class_name(*symbol);
function->shared()->set_expected_nof_properties(2);
Handle<JSObject> result = Factory::NewJSObject(function);
global_context()->set_arguments_boilerplate(*result);
// Note: callee must be added as the first property and
// length must be added as the second property.
SetProperty(result, Factory::callee_symbol(),
Factory::undefined_value(),
DONT_ENUM);
SetProperty(result, Factory::length_symbol(),
Factory::undefined_value(),
DONT_ENUM);
#ifdef DEBUG
LookupResult lookup;
result->LocalLookup(Heap::callee_symbol(), &lookup);
ASSERT(lookup.IsValid() && (lookup.type() == FIELD));
ASSERT(lookup.GetFieldIndex() == Heap::arguments_callee_index);
result->LocalLookup(Heap::length_symbol(), &lookup);
ASSERT(lookup.IsValid() && (lookup.type() == FIELD));
ASSERT(lookup.GetFieldIndex() == Heap::arguments_length_index);
ASSERT(result->map()->inobject_properties() > Heap::arguments_callee_index);
ASSERT(result->map()->inobject_properties() > Heap::arguments_length_index);
// Check the state of the object.
ASSERT(result->HasFastProperties());
ASSERT(result->HasFastElements());
#endif
}
{ // --- context extension
// Create a function for the context extension objects.
Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal));
Handle<JSFunction> context_extension_fun =
Factory::NewFunction(Factory::empty_symbol(),
JS_CONTEXT_EXTENSION_OBJECT_TYPE,
JSObject::kHeaderSize,
code,
true);
Handle<String> name = Factory::LookupAsciiSymbol("context_extension");
context_extension_fun->shared()->set_instance_class_name(*name);
global_context()->set_context_extension_function(*context_extension_fun);
}
{
// Setup the call-as-function delegate.
Handle<Code> code =
Handle<Code>(Builtins::builtin(Builtins::HandleApiCallAsFunction));
Handle<JSFunction> delegate =
Factory::NewFunction(Factory::empty_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_context()->set_call_as_function_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
{
// Setup the call-as-constructor delegate.
Handle<Code> code =
Handle<Code>(Builtins::builtin(Builtins::HandleApiCallAsConstructor));
Handle<JSFunction> delegate =
Factory::NewFunction(Factory::empty_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_context()->set_call_as_constructor_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
global_context()->set_special_function_table(Heap::empty_fixed_array());
// Initialize the out of memory slot.
global_context()->set_out_of_memory(Heap::false_value());
// Initialize the data slot.
global_context()->set_data(Heap::undefined_value());
}
bool Genesis::CompileBuiltin(int index) {
Vector<const char> name = Natives::GetScriptName(index);
Handle<String> source_code = Bootstrapper::NativesSourceLookup(index);
return CompileNative(name, source_code);
}
bool Genesis::CompileNative(Vector<const char> name, Handle<String> source) {
HandleScope scope;
#ifdef ENABLE_DEBUGGER_SUPPORT
Debugger::set_compiling_natives(true);
#endif
bool result =
CompileScriptCached(name, source, &natives_cache, NULL, true);
ASSERT(Top::has_pending_exception() != result);
if (!result) Top::clear_pending_exception();
#ifdef ENABLE_DEBUGGER_SUPPORT
Debugger::set_compiling_natives(false);
#endif
return result;
}
bool Genesis::CompileScriptCached(Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
bool use_runtime_context) {
HandleScope scope;
Handle<JSFunction> boilerplate;
// If we can't find the function in the cache, we compile a new
// function and insert it into the cache.
if (!cache->Lookup(name, &boilerplate)) {
ASSERT(source->IsAsciiRepresentation());
Handle<String> script_name = Factory::NewStringFromUtf8(name);
boilerplate =
Compiler::Compile(source, script_name, 0, 0, extension, NULL);
if (boilerplate.is_null()) return false;
cache->Add(name, boilerplate);
}
// Setup the function context. Conceptually, we should clone the
// function before overwriting the context but since we're in a
// single-threaded environment it is not strictly necessary.
ASSERT(Top::context()->IsGlobalContext());
Handle<Context> context =
Handle<Context>(use_runtime_context
? Top::context()->runtime_context()
: Top::context());
Handle<JSFunction> fun =
Factory::NewFunctionFromBoilerplate(boilerplate, context);
// Call function using the either the runtime object or the global
// object as the receiver. Provide no parameters.
Handle<Object> receiver =
Handle<Object>(use_runtime_context
? Top::context()->builtins()
: Top::context()->global());
bool has_pending_exception;
Handle<Object> result =
Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
if (has_pending_exception) return false;
return PendingFixups::Process(
Handle<JSBuiltinsObject>(Top::context()->builtins()));
}
#define INSTALL_NATIVE(Type, name, var) \
Handle<String> var##_name = Factory::LookupAsciiSymbol(name); \
global_context()->set_##var(Type::cast(global_context()-> \
builtins()-> \
GetProperty(*var##_name)));
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, "ToBoolean", to_boolean_fun);
INSTALL_NATIVE(JSFunction, "Instantiate", instantiate_fun);
INSTALL_NATIVE(JSFunction, "ConfigureTemplateInstance",
configure_instance_fun);
INSTALL_NATIVE(JSFunction, "MakeMessage", make_message_fun);
INSTALL_NATIVE(JSFunction, "GetStackTraceLine", get_stack_trace_line_fun);
INSTALL_NATIVE(JSObject, "functionCache", function_cache);
}
#undef INSTALL_NATIVE
bool Genesis::InstallNatives() {
HandleScope scope;
// Create a function for the builtins object. Allocate space for the
// JavaScript builtins, a reference to the builtins object
// (itself) and a reference to the global_context directly in the object.
Handle<Code> code = Handle<Code>(Builtins::builtin(Builtins::Illegal));
Handle<JSFunction> builtins_fun =
Factory::NewFunction(Factory::empty_symbol(), JS_BUILTINS_OBJECT_TYPE,
JSBuiltinsObject::kSize, code, true);
Handle<String> name = Factory::LookupAsciiSymbol("builtins");
builtins_fun->shared()->set_instance_class_name(*name);
// Allocate the builtins object.
Handle<JSBuiltinsObject> builtins =
Handle<JSBuiltinsObject>::cast(Factory::NewGlobalObject(builtins_fun));
builtins->set_builtins(*builtins);
builtins->set_global_context(*global_context());
builtins->set_global_receiver(*builtins);
// Setup 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);
SetProperty(builtins, Factory::LookupAsciiSymbol("global"),
Handle<Object>(global_context()->global()), attributes);
// Setup the reference from the global object to the builtins object.
JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins);
// Create a bridge function that has context in the global context.
Handle<JSFunction> bridge =
Factory::NewFunction(Factory::empty_symbol(), Factory::undefined_value());
ASSERT(bridge->context() == *Top::global_context());
// Allocate the builtins context.
Handle<Context> context =
Factory::NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge);
context->set_global(*builtins); // override builtins global object
global_context()->set_runtime_context(*context);
{ // -- S c r i p t
// Builtin functions for Script.
Handle<JSFunction> script_fun =
InstallFunction(builtins, "Script", JS_VALUE_TYPE, JSValue::kSize,
Top::initial_object_prototype(), Builtins::Illegal,
false);
Handle<JSObject> prototype =
Factory::NewJSObject(Top::object_function(), TENURED);
SetPrototype(script_fun, prototype);
global_context()->set_script_function(*script_fun);
// Add 'source' and 'data' property to scripts.
PropertyAttributes common_attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<Proxy> proxy_source = Factory::NewProxy(&Accessors::ScriptSource);
Handle<DescriptorArray> script_descriptors =
Factory::CopyAppendProxyDescriptor(
Factory::empty_descriptor_array(),
Factory::LookupAsciiSymbol("source"),
proxy_source,
common_attributes);
Handle<Proxy> proxy_name = Factory::NewProxy(&Accessors::ScriptName);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("name"),
proxy_name,
common_attributes);
Handle<Proxy> proxy_id = Factory::NewProxy(&Accessors::ScriptId);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("id"),
proxy_id,
common_attributes);
Handle<Proxy> proxy_line_offset =
Factory::NewProxy(&Accessors::ScriptLineOffset);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("line_offset"),
proxy_line_offset,
common_attributes);
Handle<Proxy> proxy_column_offset =
Factory::NewProxy(&Accessors::ScriptColumnOffset);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("column_offset"),
proxy_column_offset,
common_attributes);
Handle<Proxy> proxy_data = Factory::NewProxy(&Accessors::ScriptData);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("data"),
proxy_data,
common_attributes);
Handle<Proxy> proxy_type = Factory::NewProxy(&Accessors::ScriptType);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("type"),
proxy_type,
common_attributes);
Handle<Proxy> proxy_compilation_type =
Factory::NewProxy(&Accessors::ScriptCompilationType);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("compilation_type"),
proxy_compilation_type,
common_attributes);
Handle<Proxy> proxy_line_ends =
Factory::NewProxy(&Accessors::ScriptLineEnds);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("line_ends"),
proxy_line_ends,
common_attributes);
Handle<Proxy> proxy_context_data =
Factory::NewProxy(&Accessors::ScriptContextData);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("context_data"),
proxy_context_data,
common_attributes);
Handle<Proxy> proxy_eval_from_function =
Factory::NewProxy(&Accessors::ScriptEvalFromFunction);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("eval_from_function"),
proxy_eval_from_function,
common_attributes);
Handle<Proxy> proxy_eval_from_position =
Factory::NewProxy(&Accessors::ScriptEvalFromPosition);
script_descriptors =
Factory::CopyAppendProxyDescriptor(
script_descriptors,
Factory::LookupAsciiSymbol("eval_from_position"),
proxy_eval_from_position,
common_attributes);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
script_map->set_instance_descriptors(*script_descriptors);
// Allocate the empty script.
Handle<Script> script = Factory::NewScript(Factory::empty_string());
script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
global_context()->set_empty_script(*script);
}
if (FLAG_natives_file == NULL) {
// Without natives file, install default natives.
for (int i = Natives::GetDelayCount();
i < Natives::GetBuiltinsCount();
i++) {
if (!CompileBuiltin(i)) return false;
}
// Setup natives with lazy loading.
SetupLazy(Handle<JSFunction>(global_context()->date_function()),
Natives::GetIndex("date"),
Top::global_context(),
Handle<Context>(Top::context()->runtime_context()));
SetupLazy(Handle<JSFunction>(global_context()->regexp_function()),
Natives::GetIndex("regexp"),
Top::global_context(),
Handle<Context>(Top::context()->runtime_context()));
SetupLazy(Handle<JSObject>(global_context()->json_object()),
Natives::GetIndex("json"),
Top::global_context(),
Handle<Context>(Top::context()->runtime_context()));
} else if (strlen(FLAG_natives_file) != 0) {
// Otherwise install natives from natives file if file exists and
// compiles.
bool exists;
Vector<const char> source = ReadFile(FLAG_natives_file, &exists);
Handle<String> source_string = Factory::NewStringFromAscii(source);
if (source.is_empty()) return false;
bool result = CompileNative(CStrVector(FLAG_natives_file), source_string);
if (!result) return false;
} else {
// Empty natives file name - do not install any natives.
PrintF("Warning: Running without installed natives!\n");
return true;
}
InstallNativeFunctions();
// Install Function.prototype.call and apply.
{ Handle<String> key = Factory::function_class_symbol();
Handle<JSFunction> function =
Handle<JSFunction>::cast(GetProperty(Top::global(), key));
Handle<JSObject> proto =
Handle<JSObject>(JSObject::cast(function->instance_prototype()));
// Install the call and the apply functions.
Handle<JSFunction> call =
InstallFunction(proto, "call", JS_OBJECT_TYPE, JSObject::kHeaderSize,
Factory::NewJSObject(Top::object_function(), TENURED),
Builtins::FunctionCall,
false);
Handle<JSFunction> apply =
InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
Factory::NewJSObject(Top::object_function(), TENURED),
Builtins::FunctionApply,
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);
}
#ifdef DEBUG
builtins->Verify();
#endif
return true;
}
bool Genesis::InstallSpecialObjects() {
HandleScope scope;
Handle<JSGlobalObject> js_global(
JSGlobalObject::cast(global_context()->global()));
// Expose the natives in global if a name for it is specified.
if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) {
Handle<String> natives_string =
Factory::LookupAsciiSymbol(FLAG_expose_natives_as);
SetProperty(js_global, natives_string,
Handle<JSObject>(js_global->builtins()), DONT_ENUM);
}
Handle<Object> Error = GetProperty(js_global, "Error");
if (Error->IsJSObject()) {
Handle<String> name = Factory::LookupAsciiSymbol("stackTraceLimit");
SetProperty(Handle<JSObject>::cast(Error),
name,
Handle<Smi>(Smi::FromInt(FLAG_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) {
// If loading fails we just bail out without installing the
// debugger but without tanking the whole context.
if (!Debug::Load())
return true;
// Set the security token for the debugger context to the same as
// the shell global context to allow calling between these (otherwise
// exposing debug global object doesn't make much sense).
Debug::debug_context()->set_security_token(
global_context()->security_token());
Handle<String> debug_string =
Factory::LookupAsciiSymbol(FLAG_expose_debug_as);
SetProperty(js_global, debug_string,
Handle<Object>(Debug::debug_context()->global_proxy()), DONT_ENUM);
}
#endif
return true;
}
bool Genesis::InstallExtensions(v8::ExtensionConfiguration* extensions) {
// Clear coloring of extension list
v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
while (current != NULL) {
current->set_state(v8::UNVISITED);
current = current->next();
}
// Install auto extensions
current = v8::RegisteredExtension::first_extension();
while (current != NULL) {
if (current->extension()->auto_enable())
InstallExtension(current);
current = current->next();
}
if (FLAG_expose_gc) InstallExtension("v8/gc");
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]))
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) {
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);
}
bool Genesis::InstallExtension(v8::RegisteredExtension* current) {
HandleScope scope;
if (current->state() == v8::INSTALLED) return true;
// The current node has already been visited so there must be a
// cycle in the dependency graph; fail.
if (current->state() == v8::VISITED) {
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Circular extension dependency");
return false;
}
ASSERT(current->state() == v8::UNVISITED);
current->set_state(v8::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])) return false;
}
Vector<const char> source = CStrVector(extension->source());
Handle<String> source_code = Factory::NewStringFromAscii(source);
bool result = CompileScriptCached(CStrVector(extension->name()),
source_code,
&extensions_cache, extension,
false);
ASSERT(Top::has_pending_exception() != result);
if (!result) {
Top::clear_pending_exception();
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Error installing extension");
}
current->set_state(v8::INSTALLED);
return result;
}
bool Genesis::ConfigureGlobalObjects(
v8::Handle<v8::ObjectTemplate> global_proxy_template) {
Handle<JSObject> global_proxy(
JSObject::cast(global_context()->global_proxy()));
Handle<JSObject> js_global(JSObject::cast(global_context()->global()));
if (!global_proxy_template.IsEmpty()) {
// Configure the global proxy object.
Handle<ObjectTemplateInfo> proxy_data =
v8::Utils::OpenHandle(*global_proxy_template);
if (!ConfigureApiObject(global_proxy, proxy_data)) return false;
// Configure the inner global object.
Handle<FunctionTemplateInfo> proxy_constructor(
FunctionTemplateInfo::cast(proxy_data->constructor()));
if (!proxy_constructor->prototype_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> inner_data(
ObjectTemplateInfo::cast(proxy_constructor->prototype_template()));
if (!ConfigureApiObject(js_global, inner_data)) return false;
}
}
SetObjectPrototype(global_proxy, js_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(Top::has_pending_exception());
Top::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 = PropertyDetails(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));
SetProperty(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));
SetProperty(to, key, fun, details.attributes());
break;
}
case CALLBACKS: {
LookupResult result;
to->LocalLookup(descs->GetKey(i), &result);
// If the property is already there we skip it
if (result.IsValid()) continue;
HandleScope inner;
Handle<DescriptorArray> inst_descs =
Handle<DescriptorArray>(to->map()->instance_descriptors());
Handle<String> key = Handle<String>(descs->GetKey(i));
Handle<Object> entry = Handle<Object>(descs->GetCallbacksObject(i));
inst_descs = Factory::CopyAppendProxyDescriptor(inst_descs,
key,
entry,
details.attributes());
to->map()->set_instance_descriptors(*inst_descs);
break;
}
case MAP_TRANSITION:
case CONSTANT_TRANSITION:
case NULL_DESCRIPTOR:
// Ignore non-properties.
break;
case NORMAL:
// Do not occur since the from object has fast properties.
case INTERCEPTOR:
// No element in instance descriptors have 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;
to->LocalLookup(String::cast(raw_key), &result);
if (result.IsValid()) 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);
SetProperty(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;
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::CopyMapDropTransitions(old_to_map);
new_to_map->set_prototype(from->map()->prototype());
to->set_map(*new_to_map);
}
void Genesis::MakeFunctionInstancePrototypeWritable() {
// Make a new function map so all future functions
// will have settable and enumerable prototype properties.
HandleScope scope;
Handle<DescriptorArray> function_map_descriptors =
ComputeFunctionInstanceDescriptor(false);
Handle<Map> fm = Factory::CopyMapDropDescriptors(Top::function_map());
fm->set_instance_descriptors(*function_map_descriptors);
Top::context()->global_context()->set_function_map(*fm);
}
void Genesis::AddSpecialFunction(Handle<JSObject> prototype,
const char* name,
Handle<Code> code) {
Handle<String> key = Factory::LookupAsciiSymbol(name);
Handle<Object> value = Handle<Object>(prototype->GetProperty(*key));
if (value->IsJSFunction()) {
Handle<JSFunction> optimized = Factory::NewFunction(key,
JS_OBJECT_TYPE,
JSObject::kHeaderSize,
code,
false);
optimized->shared()->DontAdaptArguments();
int len = global_context()->special_function_table()->length();
Handle<FixedArray> new_array = Factory::NewFixedArray(len + 3);
for (int index = 0; index < len; index++) {
new_array->set(index,
global_context()->special_function_table()->get(index));
}
new_array->set(len+0, *prototype);
new_array->set(len+1, *value);
new_array->set(len+2, *optimized);
global_context()->set_special_function_table(*new_array);
}
}
void Genesis::BuildSpecialFunctionTable() {
HandleScope scope;
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
// Add special versions for Array.prototype.pop and push.
Handle<JSFunction> function =
Handle<JSFunction>(
JSFunction::cast(global->GetProperty(Heap::Array_symbol())));
Handle<JSObject> visible_prototype =
Handle<JSObject>(JSObject::cast(function->prototype()));
// Remember to put push and pop on the hidden prototype if it's there.
Handle<JSObject> push_and_pop_prototype;
Handle<Object> superproto(visible_prototype->GetPrototype());
if (superproto->IsJSObject() &&
JSObject::cast(*superproto)->map()->is_hidden_prototype()) {
push_and_pop_prototype = Handle<JSObject>::cast(superproto);
} else {
push_and_pop_prototype = visible_prototype;
}
AddSpecialFunction(push_and_pop_prototype, "pop",
Handle<Code>(Builtins::builtin(Builtins::ArrayPop)));
AddSpecialFunction(push_and_pop_prototype, "push",
Handle<Code>(Builtins::builtin(Builtins::ArrayPush)));
}
Genesis::Genesis(Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
// Link this genesis object into the stacked genesis chain. This
// must be done before any early exits because the destructor
// will always do unlinking.
previous_ = current_;
current_ = this;
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 context;
CreateRoots(global_template, global_object);
if (!InstallNatives()) return;
MakeFunctionInstancePrototypeWritable();
BuildSpecialFunctionTable();
if (!ConfigureGlobalObjects(global_template)) return;
if (!InstallExtensions(extensions)) return;
if (!InstallSpecialObjects()) return;
result_ = global_context_;
}
// Support for thread preemption.
// Reserve space for statics needing saving and restoring.
int Bootstrapper::ArchiveSpacePerThread() {
return Genesis::ArchiveSpacePerThread();
}
// Archive statics that are thread local.
char* Bootstrapper::ArchiveState(char* to) {
return Genesis::ArchiveState(to);
}
// Restore statics that are thread local.
char* Bootstrapper::RestoreState(char* from) {
return Genesis::RestoreState(from);
}
// Reserve space for statics needing saving and restoring.
int Genesis::ArchiveSpacePerThread() {
return sizeof(current_);
}
// Archive statics that are thread local.
char* Genesis::ArchiveState(char* to) {
*reinterpret_cast<Genesis**>(to) = current_;
current_ = NULL;
return to + sizeof(current_);
}
// Restore statics that are thread local.
char* Genesis::RestoreState(char* from) {
current_ = *reinterpret_cast<Genesis**>(from);
return from + sizeof(current_);
}
} } // namespace v8::internal
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