bootstrapper.cc.svn-base

Google浏览器V8内核代码

            JSObject::cast(global_context()->object_function()->prototype()));
    Handle<JSFunction> function =
        Factory::NewFunctionWithPrototype(symbol, JS_OBJECT_TYPE,
                                          JSObject::kHeaderSize, prototype,
                                          code, true);
    function->shared()->set_instance_class_name(*symbol);

    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);

    // Check the state of the object.
    ASSERT(result->HasFastProperties());
    ASSERT(result->HasFastElements());
  }

  {  // --- 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_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();

  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());
}


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;
  Debugger::set_compiling_natives(true);
  bool result =
      CompileScriptCached(name, source, &natives_cache, NULL, true);
  ASSERT(Top::has_pending_exception() != result);
  if (!result) Top::clear_pending_exception();
  Debugger::set_compiling_natives(false);
  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)) {
#ifdef DEBUG
    ASSERT(source->IsAscii());
#endif
    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);
  SetExpectedNofProperties(builtins_fun, 100);

  // Allocate the builtins object.
  Handle<JSBuiltinsObject> builtins =
      Handle<JSBuiltinsObject>::cast(Factory::NewJSObject(builtins_fun,
                                                          TENURED));
  builtins->set_builtins(*builtins);
  builtins->set_global_context(*global_context());

  // 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_data = Factory::NewProxy(&Accessors::ScriptName);
    script_descriptors =
        Factory::CopyAppendProxyDescriptor(
            script_descriptors,
            Factory::LookupAsciiSymbol("name"),
            proxy_data,
            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_type = Factory::NewProxy(&Accessors::ScriptType);
    script_descriptors =
        Factory::CopyAppendProxyDescriptor(
            script_descriptors,
            Factory::LookupAsciiSymbol("type"),
            proxy_type,
            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());
    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()),
              Handle<Context>(Top::security_context()));
    SetupLazy(Handle<JSFunction>(global_context()->regexp_function()),
              Natives::GetIndex("regexp"),
              Top::global_context(),
              Handle<Context>(Top::context()->runtime_context()),
              Handle<Context>(Top::security_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 paramters 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);
  }

  // Make sure that the builtins object has fast properties.
  // If the ASSERT below fails, please increase the expected number of
  // properties for the builtins object.
  ASSERT(builtins->HasFastProperties());
#ifdef DEBUG
  builtins->Verify();
#endif
  return true;
}


bool Genesis::InstallSpecialObjects() {
  HandleScope scope;
  Handle<JSGlobalObject> global(
      JSGlobalObject::cast(global_context()->global()));