api.cc.svn-base

Google浏览器V8内核代码

Local<Int32> Value::ToInt32() {
  if (IsDeadCheck("v8::Value::ToInt32()")) return Local<Int32>();
  LOG_API("ToInt32");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  i::Handle<i::Object> num;
  if (obj->IsSmi()) {
    num = obj;
  } else {
    EXCEPTION_PREAMBLE();
    num = i::Execution::ToInt32(obj, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(Local<Int32>());
  }
  return Local<Int32>(ToApi<Int32>(num));
}


Local<Uint32> Value::ToUint32() {
  if (IsDeadCheck("v8::Value::ToUint32()")) return Local<Uint32>();
  LOG_API("ToUInt32");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  i::Handle<i::Object> num;
  if (obj->IsSmi()) {
    num = obj;
  } else {
    EXCEPTION_PREAMBLE();
    num = i::Execution::ToUint32(obj, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(Local<Uint32>());
  }
  return Local<Uint32>(ToApi<Uint32>(num));
}


Local<Uint32> Value::ToArrayIndex() {
  if (IsDeadCheck("v8::Value::ToArrayIndex()")) return Local<Uint32>();
  LOG_API("ToArrayIndex");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (obj->IsSmi()) {
    if (i::Smi::cast(*obj)->value() >= 0) return Utils::Uint32ToLocal(obj);
    return Local<Uint32>();
  }
  EXCEPTION_PREAMBLE();
  i::Handle<i::Object> string_obj =
      i::Execution::ToString(obj, &has_pending_exception);
  EXCEPTION_BAILOUT_CHECK(Local<Uint32>());
  i::Handle<i::String> str = i::Handle<i::String>::cast(string_obj);
  uint32_t index;
  if (str->AsArrayIndex(&index)) {
    i::Handle<i::Object> value;
    if (index <= static_cast<uint32_t>(i::Smi::kMaxValue)) {
      value = i::Handle<i::Object>(i::Smi::FromInt(index));
    } else {
      value = i::Factory::NewNumber(index);
    }
    return Utils::Uint32ToLocal(value);
  }
  return Local<Uint32>();
}


int32_t Value::Int32Value() {
  if (IsDeadCheck("v8::Value::Int32Value()")) return 0;
  LOG_API("Int32Value");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (obj->IsSmi()) {
    return i::Smi::cast(*obj)->value();
  } else {
    LOG_API("Int32Value (slow)");
    EXCEPTION_PREAMBLE();
    i::Handle<i::Object> num =
        i::Execution::ToInt32(obj, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(0);
    if (num->IsSmi()) {
      return i::Smi::cast(*num)->value();
    } else {
      return static_cast<int32_t>(num->Number());
    }
  }
}


bool Value::Equals(Handle<Value> that) {
  if (IsDeadCheck("v8::Value::Equals()")
      || EmptyCheck("v8::Value::Equals()", this)
      || EmptyCheck("v8::Value::Equals()", that))
    return false;
  LOG_API("Equals");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  i::Handle<i::Object> other = Utils::OpenHandle(*that);
  i::Object** args[1] = { other.location() };
  EXCEPTION_PREAMBLE();
  i::Handle<i::Object> result =
      CallV8HeapFunction("EQUALS", obj, 1, args, &has_pending_exception);
  EXCEPTION_BAILOUT_CHECK(false);
  return *result == i::Smi::FromInt(i::EQUAL);
}


bool Value::StrictEquals(Handle<Value> that) {
  if (IsDeadCheck("v8::Value::StrictEquals()")
      || EmptyCheck("v8::Value::StrictEquals()", this)
      || EmptyCheck("v8::Value::StrictEquals()", that))
    return false;
  LOG_API("StrictEquals");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  i::Handle<i::Object> other = Utils::OpenHandle(*that);
  // Must check HeapNumber first, since NaN !== NaN.
  if (obj->IsHeapNumber()) {
    if (!other->IsNumber()) return false;
    double x = obj->Number();
    double y = other->Number();
    // Must check explicitly for NaN:s on Windows, but -0 works fine.
    return x == y && !isnan(x) && !isnan(y);
  } else if (*obj == *other) {  // Also covers Booleans.
    return true;
  } else if (obj->IsSmi()) {
    return other->IsNumber() && obj->Number() == other->Number();
  } else if (obj->IsString()) {
    return other->IsString() &&
      i::String::cast(*obj)->Equals(i::String::cast(*other));
  } else if (obj->IsUndefined() || obj->IsUndetectableObject()) {
    return other->IsUndefined() || other->IsUndetectableObject();
  } else {
    return false;
  }
}


uint32_t Value::Uint32Value() {
  if (IsDeadCheck("v8::Value::Uint32Value()")) return 0;
  LOG_API("Uint32Value");
  i::Handle<i::Object> obj = Utils::OpenHandle(this);
  if (obj->IsSmi()) {
    return i::Smi::cast(*obj)->value();
  } else {
    EXCEPTION_PREAMBLE();
    i::Handle<i::Object> num =
        i::Execution::ToUint32(obj, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(0);
    if (num->IsSmi()) {
      return i::Smi::cast(*num)->value();
    } else {
      return static_cast<uint32_t>(num->Number());
    }
  }
}


bool v8::Object::Set(v8::Handle<Value> key, v8::Handle<Value> value,
                             v8::PropertyAttribute attribs) {
  ON_BAILOUT("v8::Object::Set()", return false);
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
  EXCEPTION_PREAMBLE();
  i::Handle<i::Object> obj = i::SetProperty(
      self,
      key_obj,
      value_obj,
      static_cast<PropertyAttributes>(attribs));
  has_pending_exception = obj.is_null();
  EXCEPTION_BAILOUT_CHECK(false);
  return true;
}


Local<Value> v8::Object::Get(v8::Handle<Value> key) {
  ON_BAILOUT("v8::Object::Get()", return Local<v8::Value>());
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
  EXCEPTION_PREAMBLE();
  i::Handle<i::Object> result = i::GetProperty(self, key_obj);
  has_pending_exception = result.is_null();
  EXCEPTION_BAILOUT_CHECK(Local<Value>());
  return Utils::ToLocal(result);
}


Local<Value> v8::Object::GetPrototype() {
  ON_BAILOUT("v8::Object::GetPrototype()", return Local<v8::Value>());
  i::Handle<i::Object> self = Utils::OpenHandle(this);
  i::Handle<i::Object> result = i::GetPrototype(self);
  return Utils::ToLocal(result);
}


Local<String> v8::Object::ObjectProtoToString() {
  ON_BAILOUT("v8::Object::ObjectProtoToString()", return Local<v8::String>());
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);

  i::Handle<i::Object> name(self->class_name());

  // Native implementation of Object.prototype.toString (v8natives.js):
  //   var c = %ClassOf(this);
  //   if (c === 'Arguments') c  = 'Object';
  //   return "[object " + c + "]";

  if (!name->IsString()) {
    return v8::String::New("[object ]");

  } else {
    i::Handle<i::String> class_name = i::Handle<i::String>::cast(name);
    if (class_name->IsEqualTo(i::CStrVector("Arguments"))) {
      return v8::String::New("[object Object]");

    } else {
      const char* prefix = "[object ";
      Local<String> str = Utils::ToLocal(class_name);
      const char* postfix = "]";

      size_t prefix_len = strlen(prefix);
      size_t str_len = str->Length();
      size_t postfix_len = strlen(postfix);

      size_t buf_len = prefix_len + str_len + postfix_len;
      char* buf = i::NewArray<char>(buf_len);

      // Write prefix.
      char* ptr = buf;
      memcpy(ptr, prefix, prefix_len * v8::internal::kCharSize);
      ptr += prefix_len;

      // Write real content.
      str->WriteAscii(ptr, 0, str_len);
      ptr += str_len;

      // Write postfix.
      memcpy(ptr, postfix, postfix_len * v8::internal::kCharSize);

      // Copy the buffer into a heap-allocated string and return it.
      Local<String> result = v8::String::New(buf, buf_len);
      i::DeleteArray(buf);
      return result;
    }
  }
}


bool v8::Object::Delete(v8::Handle<String> key) {
  ON_BAILOUT("v8::Object::Delete()", return false);
  HandleScope scope;
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  return i::DeleteProperty(self, key_obj)->IsTrue();
}


bool v8::Object::Has(v8::Handle<String> key) {
  ON_BAILOUT("v8::Object::Has()", return false);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  return self->HasProperty(*key_obj);
}


bool v8::Object::Delete(uint32_t index) {
  ON_BAILOUT("v8::Object::DeleteProperty()", return false);
  HandleScope scope;
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  return i::DeleteElement(self, index)->IsTrue();
}


bool v8::Object::Has(uint32_t index) {
  ON_BAILOUT("v8::Object::HasProperty()", return false);
  i::Handle<i::JSObject> self = Utils::OpenHandle(this);
  return self->HasElement(index);
}


bool v8::Object::HasRealNamedProperty(Handle<String> key) {
  ON_BAILOUT("v8::Object::HasRealNamedProperty()", return false);
  return Utils::OpenHandle(this)->HasRealNamedProperty(
      *Utils::OpenHandle(*key));
}


bool v8::Object::HasRealIndexedProperty(uint32_t index) {
  ON_BAILOUT("v8::Object::HasRealIndexedProperty()", return false);
  return Utils::OpenHandle(this)->HasRealElementProperty(index);
}


bool v8::Object::HasRealNamedCallbackProperty(Handle<String> key) {
  ON_BAILOUT("v8::Object::HasRealNamedCallbackProperty()", return false);
  return Utils::OpenHandle(this)->HasRealNamedCallbackProperty(
      *Utils::OpenHandle(*key));
}


bool v8::Object::HasNamedLookupInterceptor() {
  ON_BAILOUT("v8::Object::HasNamedLookupInterceptor()", return false);
  return Utils::OpenHandle(this)->HasNamedInterceptor();
}


bool v8::Object::HasIndexedLookupInterceptor() {
  ON_BAILOUT("v8::Object::HasIndexedLookupInterceptor()", return false);
  return Utils::OpenHandle(this)->HasIndexedInterceptor();
}


Handle<Value> v8::Object::GetRealNamedPropertyInPrototypeChain(
      Handle<String> key) {
  ON_BAILOUT("v8::Object::GetRealNamedPropertyInPrototypeChain()",
             return Local<Value>());
  i::Handle<i::JSObject> self_obj = Utils::OpenHandle(this);
  i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
  i::LookupResult lookup;
  self_obj->LookupRealNamedPropertyInPrototypes(*key_obj, &lookup);
  if (lookup.IsValid()) {
    PropertyAttributes attributes;
    i::Handle<i::Object> result(self_obj->GetProperty(*self_obj,
                                                      &lookup,
                                                      *key_obj,
                                                      &attributes));
    return Utils::ToLocal(result);
  }
  return Local<Value>();  // No real property was found in prototype chain.
}


Local<v8::Object> Function::NewInstance() {
  return NewInstance(0, NULL);
}


Local<v8::Object> Function::NewInstance(int argc,
                                        v8::Handle<v8::Value> argv[]) {
  ON_BAILOUT("v8::Function::NewInstance()", return Local<v8::Object>());
  LOG_API("Function::NewInstance");
  HandleScope scope;
  i::Handle<i::JSFunction> function = Utils::OpenHandle(this);
  STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
  i::Object*** args = reinterpret_cast<i::Object***>(argv);
  EXCEPTION_PREAMBLE();
  i::Handle<i::Object> returned =
      i::Execution::New(function, argc, args, &has_pending_exception);
  EXCEPTION_BAILOUT_CHECK(Local<v8::Object>());
  return scope.Close(Utils::ToLocal(i::Handle<i::JSObject>::cast(returned)));
}


Local<v8::Value> Function::Call(v8::Handle<v8::Object> recv, int argc,
                                v8::Handle<v8::Value> argv[]) {
  ON_BAILOUT("v8::Function::Call()", return Local<v8::Value>());
  LOG_API("Function::Call");
  i::Object* raw_result = NULL;
  {
    HandleScope scope;
    i::Handle<i::JSFunction> fun = Utils::OpenHandle(this);
    i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
    STATIC_ASSERT(sizeof(v8::Handle<v8::Value>) == sizeof(i::Object**));
    i::Object*** args = reinterpret_cast<i::Object***>(argv);
    EXCEPTION_PREAMBLE();
    i::Handle<i::Object> returned =
        i::Execution::Call(fun, recv_obj, argc, args, &has_pending_exception);
    EXCEPTION_BAILOUT_CHECK(Local<Object>());
    raw_result = *returned;
  }
  i::Handle<i::Object> result(raw_result);
  return Utils::ToLocal(result);
}


void Function::SetName(v8::Handle<v8::String> name) {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  func->shared()->set_name(*Utils::OpenHandle(*name));
}


Handle<Value> Function::GetName() {
  i::Handle<i::JSFunction> func = Utils::OpenHandle(this);
  return Utils::ToLocal(i::Handle<i::Object>(func->shared()->name()));
}


int String::Length() {
  if (IsDeadCheck("v8::String::Length()")) return 0;
  return Utils::OpenHandle(this)->length();
}


int String::Utf8Length() {
  if (IsDeadCheck("v8::String::Utf8Length()")) return 0;
  return Utils::OpenHandle(this)->Utf8Length();
}


int String::WriteUtf8(char* buffer, int capacity) {
  if (IsDeadCheck("v8::String::WriteUtf8()")) return 0;
  LOG_API("String::WriteUtf8");
  i::Handle<i::String> str = Utils::OpenHandle(this);
  write_input_buffer.Reset(0, *str);
  int len = str->length();
  // Encode the first K - 3 bytes directly into the buffer since we
  // know there's room for them.  If no capacity is given we copy all
  // of them here.
  int fast_end = capacity - (unibrow::Utf8::kMaxEncodedSize - 1);
  int i;