builtins.cc.svn-base

Google浏览器V8内核代码

  Object* raw_holder = TypeCheck(__argc__, __argv__, fun_data);

  if (raw_holder->IsNull()) {
    // This function cannot be called with the given receiver.  Abort!
    Handle<Object> obj =
        Factory::NewTypeError("illegal_invocation", HandleVector(&function, 1));
    return Top::Throw(*obj);
  }

  Object* raw_call_data = fun_data->call_code();
  if (!raw_call_data->IsUndefined()) {
    CallHandlerInfo* call_data = CallHandlerInfo::cast(raw_call_data);
    Object* callback_obj = call_data->callback();
    v8::InvocationCallback callback =
        v8::ToCData<v8::InvocationCallback>(callback_obj);
    Object* data_obj = call_data->data();
    Object* result;

    v8::Local<v8::Object> self =
        v8::Utils::ToLocal(Handle<JSObject>::cast(receiver));
    Handle<Object> data_handle(data_obj);
    v8::Local<v8::Value> data = v8::Utils::ToLocal(data_handle);
    ASSERT(raw_holder->IsJSObject());
    v8::Local<v8::Function> callee = v8::Utils::ToLocal(function);
    Handle<JSObject> holder_handle(JSObject::cast(raw_holder));
    v8::Local<v8::Object> holder = v8::Utils::ToLocal(holder_handle);
    LOG(ApiObjectAccess("call", JSObject::cast(*receiver)));
    v8::Arguments args = v8::ImplementationUtilities::NewArguments(
        data,
        holder,
        callee,
        is_construct,
        reinterpret_cast<void**>(__argv__ - 1),
        __argc__ - 1);

    v8::Handle<v8::Value> value;
    {
      // Leaving JavaScript.
      VMState state(OTHER);
      value = callback(args);
    }
    if (value.IsEmpty()) {
      result = Heap::undefined_value();
    } else {
      result = *reinterpret_cast<Object**>(*value);
    }

    RETURN_IF_SCHEDULED_EXCEPTION();
    if (!is_construct || result->IsJSObject()) return result;
  }

  return *receiver;
}
BUILTIN_END


// Handle calls to non-function objects created through the API that
// support calls.
BUILTIN(HandleApiCallAsFunction) {
  // Non-functions are never called as constructors.
  ASSERT(!CalledAsConstructor());

  // Get the object called.
  JSObject* obj = JSObject::cast(*receiver);

  // Get the invocation callback from the function descriptor that was
  // used to create the called object.
  ASSERT(obj->map()->has_instance_call_handler());
  JSFunction* constructor = JSFunction::cast(obj->map()->constructor());
  Object* template_info = constructor->shared()->function_data();
  Object* handler =
      FunctionTemplateInfo::cast(template_info)->instance_call_handler();
  ASSERT(!handler->IsUndefined());
  CallHandlerInfo* call_data = CallHandlerInfo::cast(handler);
  Object* callback_obj = call_data->callback();
  v8::InvocationCallback callback =
      v8::ToCData<v8::InvocationCallback>(callback_obj);

  // Get the data for the call and perform the callback.
  Object* data_obj = call_data->data();
  Object* result;
  { HandleScope scope;
    v8::Local<v8::Object> self =
        v8::Utils::ToLocal(Handle<JSObject>::cast(receiver));
    Handle<Object> data_handle(data_obj);
    v8::Local<v8::Value> data = v8::Utils::ToLocal(data_handle);
    Handle<JSFunction> callee_handle(constructor);
    v8::Local<v8::Function> callee = v8::Utils::ToLocal(callee_handle);
    LOG(ApiObjectAccess("call non-function", JSObject::cast(*receiver)));
    v8::Arguments args = v8::ImplementationUtilities::NewArguments(
        data,
        self,
        callee,
        false,
        reinterpret_cast<void**>(__argv__ - 1),
        __argc__ - 1);
    v8::Handle<v8::Value> value;
    {
      // Leaving JavaScript.
      VMState state(OTHER);
      value = callback(args);
    }
    if (value.IsEmpty()) {
      result = Heap::undefined_value();
    } else {
      result = *reinterpret_cast<Object**>(*value);
    }
  }
  // Check for exceptions and return result.
  RETURN_IF_SCHEDULED_EXCEPTION();
  return result;
}
BUILTIN_END


// TODO(1238487): This is a nasty hack. We need to improve the way we
// call builtins considerable to get rid of this and the hairy macros
// in builtins.cc.
Object* Builtins::builtin_passed_function;



static void Generate_LoadIC_ArrayLength(MacroAssembler* masm) {
  LoadIC::GenerateArrayLength(masm);
}


static void Generate_LoadIC_ShortStringLength(MacroAssembler* masm) {
  LoadIC::GenerateShortStringLength(masm);
}


static void Generate_LoadIC_MediumStringLength(MacroAssembler* masm) {
  LoadIC::GenerateMediumStringLength(masm);
}


static void Generate_LoadIC_LongStringLength(MacroAssembler* masm) {
  LoadIC::GenerateLongStringLength(masm);
}


static void Generate_LoadIC_FunctionPrototype(MacroAssembler* masm) {
  LoadIC::GenerateFunctionPrototype(masm);
}


static void Generate_LoadIC_Initialize(MacroAssembler* masm) {
  LoadIC::GenerateInitialize(masm);
}


static void Generate_LoadIC_PreMonomorphic(MacroAssembler* masm) {
  LoadIC::GeneratePreMonomorphic(masm);
}


static void Generate_LoadIC_Miss(MacroAssembler* masm) {
  LoadIC::GenerateMiss(masm);
}


static void Generate_LoadIC_Megamorphic(MacroAssembler* masm) {
  LoadIC::GenerateMegamorphic(masm);
}


static void Generate_LoadIC_Normal(MacroAssembler* masm) {
  LoadIC::GenerateNormal(masm);
}


static void Generate_KeyedLoadIC_Initialize(MacroAssembler* masm) {
  KeyedLoadIC::GenerateInitialize(masm);
}


static void Generate_KeyedLoadIC_Miss(MacroAssembler* masm) {
  KeyedLoadIC::GenerateMiss(masm);
}


static void Generate_KeyedLoadIC_Generic(MacroAssembler* masm) {
  KeyedLoadIC::GenerateGeneric(masm);
}


static void Generate_KeyedLoadIC_PreMonomorphic(MacroAssembler* masm) {
  KeyedLoadIC::GeneratePreMonomorphic(masm);
}


static void Generate_StoreIC_Initialize(MacroAssembler* masm) {
  StoreIC::GenerateInitialize(masm);
}


static void Generate_StoreIC_Miss(MacroAssembler* masm) {
  StoreIC::GenerateMiss(masm);
}


static void Generate_StoreIC_Megamorphic(MacroAssembler* masm) {
  StoreIC::GenerateMegamorphic(masm);
}


static void Generate_KeyedStoreIC_Generic(MacroAssembler* masm) {
  KeyedStoreIC::GenerateGeneric(masm);
}


static void Generate_KeyedStoreIC_Miss(MacroAssembler* masm) {
  KeyedStoreIC::GenerateMiss(masm);
}


static void Generate_KeyedStoreIC_Initialize(MacroAssembler* masm) {
  KeyedStoreIC::GenerateInitialize(masm);
}


Object* Builtins::builtins_[builtin_count] = { NULL, };
const char* Builtins::names_[builtin_count] = { NULL, };

#define DEF_ENUM_C(name) FUNCTION_ADDR(Builtin_##name),
  Address Builtins::c_functions_[cfunction_count] = {
    BUILTIN_LIST_C(DEF_ENUM_C)
  };
#undef DEF_ENUM_C

#define DEF_JS_NAME(name, ignore) #name,
#define DEF_JS_ARGC(ignore, argc) argc,
const char* Builtins::javascript_names_[id_count] = {
  BUILTINS_LIST_JS(DEF_JS_NAME)
};

int Builtins::javascript_argc_[id_count] = {
  BUILTINS_LIST_JS(DEF_JS_ARGC)
};
#undef DEF_JS_NAME
#undef DEF_JS_ARGC

static bool is_initialized = false;
void Builtins::Setup(bool create_heap_objects) {
  ASSERT(!is_initialized);

  // Create a scope for the handles in the builtins.
  HandleScope scope;

  struct BuiltinDesc {
    byte* generator;
    byte* c_code;
    const char* s_name;  // name is only used for generating log information.
    int name;
    Code::Flags flags;
  };

#define DEF_FUNCTION_PTR_C(name)         \
    { FUNCTION_ADDR(Generate_Adaptor),   \
      FUNCTION_ADDR(Builtin_##name),     \
      #name,                             \
      c_##name,                          \
      Code::ComputeFlags(Code::BUILTIN)  \
    },

#define DEF_FUNCTION_PTR_A(name, kind, state) \
    { FUNCTION_ADDR(Generate_##name),         \
      NULL,                                   \
      #name,                                  \
      name,                                   \
      Code::ComputeFlags(Code::kind, state)   \
    },

  // Define array of pointers to generators and C builtin functions.
  static BuiltinDesc functions[] = {
      BUILTIN_LIST_C(DEF_FUNCTION_PTR_C)
      BUILTIN_LIST_A(DEF_FUNCTION_PTR_A)
      // Terminator:
      { NULL, NULL, NULL, builtin_count, static_cast<Code::Flags>(0) }
  };

#undef DEF_FUNCTION_PTR_C
#undef DEF_FUNCTION_PTR_A

  // For now we generate builtin adaptor code into a stack-allocated
  // buffer, before copying it into individual code objects.
  byte buffer[4*KB];

  // Traverse the list of builtins and generate an adaptor in a
  // separate code object for each one.
  for (int i = 0; i < builtin_count; i++) {
    if (create_heap_objects) {
      MacroAssembler masm(buffer, sizeof buffer);
      // Generate the code/adaptor.
      typedef void (*Generator)(MacroAssembler*, int);
      Generator g = FUNCTION_CAST<Generator>(functions[i].generator);
      // We pass all arguments to the generator, but it may not use all of
      // them.  This works because the first arguments are on top of the
      // stack.
      g(&masm, functions[i].name);
      // Move the code into the object heap.
      CodeDesc desc;
      masm.GetCode(&desc);
      Code::Flags flags =  functions[i].flags;
      Object* code = Heap::CreateCode(desc, NULL, flags);
      if (code->IsRetryAfterGC()) {
        CHECK(Heap::CollectGarbage(Failure::cast(code)->requested(),
                                   Failure::cast(code)->allocation_space()));
        code = Heap::CreateCode(desc, NULL, flags);
      }
      // Add any unresolved jumps or calls to the fixup list in the
      // bootstrapper.
      Bootstrapper::AddFixup(Code::cast(code), &masm);
      // Log the event and add the code to the builtins array.
      LOG(CodeCreateEvent("Builtin", Code::cast(code), functions[i].s_name));
      builtins_[i] = code;
#ifdef DEBUG
      if (FLAG_print_builtin_code) {
        PrintF("Builtin: %s\n", functions[i].s_name);
        code->Print();
        PrintF("\n");
      }
#endif
    } else {
      // Deserializing. The values will be filled in during IterateBuiltins.
      builtins_[i] = NULL;
    }
    names_[i] = functions[i].s_name;
  }

  // Mark as initialized.
  is_initialized = true;
}


void Builtins::TearDown() {
  is_initialized = false;
}


void Builtins::IterateBuiltins(ObjectVisitor* v) {
  v->VisitPointers(&builtins_[0], &builtins_[0] + builtin_count);
}


const char* Builtins::Lookup(byte* pc) {
  if (is_initialized) {  // may be called during initialization (disassembler!)
    for (int i = 0; i < builtin_count; i++) {
      Code* entry = Code::cast(builtins_[i]);
      if (entry->contains(pc)) {
        return names_[i];
      }
    }
  }
  return NULL;
}


} }  // namespace v8::internal