objects-inl.h.svn-base

Google浏览器V8内核代码

                               int argc) {
  // Compute the bit mask.
  int bits = kind << kFlagsKindShift;
  bits |= ic_state << kFlagsICStateShift;
  bits |= type << kFlagsTypeShift;
  bits |= argc << kFlagsArgumentsCountShift;
  // Cast to flags and validate result before returning it.
  Flags result = static_cast<Flags>(bits);
  ASSERT(ExtractKindFromFlags(result) == kind);
  ASSERT(ExtractICStateFromFlags(result) == ic_state);
  ASSERT(ExtractTypeFromFlags(result) == type);
  ASSERT(ExtractArgumentsCountFromFlags(result) == argc);
  return result;
}


Code::Flags Code::ComputeMonomorphicFlags(Kind kind,
                                          PropertyType type,
                                          int argc) {
  return ComputeFlags(kind, MONOMORPHIC, type, argc);
}


Code::Kind Code::ExtractKindFromFlags(Flags flags) {
  int bits = (flags & kFlagsKindMask) >> kFlagsKindShift;
  return static_cast<Kind>(bits);
}


InlineCacheState Code::ExtractICStateFromFlags(Flags flags) {
  int bits = (flags & kFlagsICStateMask) >> kFlagsICStateShift;
  return static_cast<InlineCacheState>(bits);
}


PropertyType Code::ExtractTypeFromFlags(Flags flags) {
  int bits = (flags & kFlagsTypeMask) >> kFlagsTypeShift;
  return static_cast<PropertyType>(bits);
}


int Code::ExtractArgumentsCountFromFlags(Flags flags) {
  return (flags & kFlagsArgumentsCountMask) >> kFlagsArgumentsCountShift;
}


Code::Flags Code::RemoveTypeFromFlags(Flags flags) {
  int bits = flags & ~kFlagsTypeMask;
  return static_cast<Flags>(bits);
}


Object* Map::prototype() {
  return READ_FIELD(this, kPrototypeOffset);
}


void Map::set_prototype(Object* value) {
  ASSERT(value->IsNull() || value->IsJSObject());
  WRITE_FIELD(this, kPrototypeOffset, value);
  WRITE_BARRIER(this, kPrototypeOffset);
}


ACCESSORS(Map, instance_descriptors, DescriptorArray,
          kInstanceDescriptorsOffset)
ACCESSORS(Map, code_cache, FixedArray, kCodeCacheOffset)
ACCESSORS(Map, constructor, Object, kConstructorOffset)

ACCESSORS(JSFunction, shared, SharedFunctionInfo, kSharedFunctionInfoOffset)
ACCESSORS(JSFunction, literals, FixedArray, kLiteralsOffset)

ACCESSORS(GlobalObject, builtins, JSBuiltinsObject, kBuiltinsOffset)
ACCESSORS(GlobalObject, global_context, Context, kGlobalContextOffset)

ACCESSORS(JSGlobalObject, security_token, Object, kSecurityTokenOffset)

ACCESSORS(AccessorInfo, getter, Object, kGetterOffset)
ACCESSORS(AccessorInfo, setter, Object, kSetterOffset)
ACCESSORS(AccessorInfo, data, Object, kDataOffset)
ACCESSORS(AccessorInfo, name, Object, kNameOffset)
ACCESSORS(AccessorInfo, flag, Smi, kFlagOffset)

ACCESSORS(AccessCheckInfo, named_callback, Object, kNamedCallbackOffset)
ACCESSORS(AccessCheckInfo, indexed_callback, Object, kIndexedCallbackOffset)
ACCESSORS(AccessCheckInfo, data, Object, kDataOffset)

ACCESSORS(InterceptorInfo, getter, Object, kGetterOffset)
ACCESSORS(InterceptorInfo, setter, Object, kSetterOffset)
ACCESSORS(InterceptorInfo, query, Object, kQueryOffset)
ACCESSORS(InterceptorInfo, deleter, Object, kDeleterOffset)
ACCESSORS(InterceptorInfo, enumerator, Object, kEnumeratorOffset)
ACCESSORS(InterceptorInfo, data, Object, kDataOffset)

ACCESSORS(CallHandlerInfo, callback, Object, kCallbackOffset)
ACCESSORS(CallHandlerInfo, data, Object, kDataOffset)

ACCESSORS(TemplateInfo, tag, Object, kTagOffset)
ACCESSORS(TemplateInfo, property_list, Object, kPropertyListOffset)

ACCESSORS(FunctionTemplateInfo, serial_number, Object, kSerialNumberOffset)
ACCESSORS(FunctionTemplateInfo, call_code, Object, kCallCodeOffset)
ACCESSORS(FunctionTemplateInfo, property_accessors, Object,
          kPropertyAccessorsOffset)
ACCESSORS(FunctionTemplateInfo, prototype_template, Object,
          kPrototypeTemplateOffset)
ACCESSORS(FunctionTemplateInfo, parent_template, Object, kParentTemplateOffset)
ACCESSORS(FunctionTemplateInfo, named_property_handler, Object,
          kNamedPropertyHandlerOffset)
ACCESSORS(FunctionTemplateInfo, indexed_property_handler, Object,
          kIndexedPropertyHandlerOffset)
ACCESSORS(FunctionTemplateInfo, instance_template, Object,
          kInstanceTemplateOffset)
ACCESSORS(FunctionTemplateInfo, class_name, Object, kClassNameOffset)
ACCESSORS(FunctionTemplateInfo, signature, Object, kSignatureOffset)
ACCESSORS(FunctionTemplateInfo, instance_call_handler, Object,
          kInstanceCallHandlerOffset)
ACCESSORS(FunctionTemplateInfo, access_check_info, Object,
          kAccessCheckInfoOffset)
ACCESSORS(FunctionTemplateInfo, flag, Smi, kFlagOffset)

ACCESSORS(ObjectTemplateInfo, constructor, Object, kConstructorOffset)
ACCESSORS(ObjectTemplateInfo, internal_field_count, Object,
          kInternalFieldCountOffset)

ACCESSORS(SignatureInfo, receiver, Object, kReceiverOffset)
ACCESSORS(SignatureInfo, args, Object, kArgsOffset)

ACCESSORS(TypeSwitchInfo, types, Object, kTypesOffset)

ACCESSORS(Script, source, Object, kSourceOffset)
ACCESSORS(Script, name, Object, kNameOffset)
ACCESSORS(Script, line_offset, Smi, kLineOffsetOffset)
ACCESSORS(Script, column_offset, Smi, kColumnOffsetOffset)
ACCESSORS(Script, wrapper, Proxy, kWrapperOffset)
ACCESSORS(Script, type, Smi, kTypeOffset)

ACCESSORS(DebugInfo, shared, SharedFunctionInfo, kSharedFunctionInfoIndex)
ACCESSORS(DebugInfo, original_code, Code, kOriginalCodeIndex)
ACCESSORS(DebugInfo, code, Code, kPatchedCodeIndex)
ACCESSORS(DebugInfo, break_points, FixedArray, kBreakPointsStateIndex)

ACCESSORS(BreakPointInfo, code_position, Smi, kCodePositionIndex)
ACCESSORS(BreakPointInfo, source_position, Smi, kSourcePositionIndex)
ACCESSORS(BreakPointInfo, statement_position, Smi, kStatementPositionIndex)
ACCESSORS(BreakPointInfo, break_point_objects, Object, kBreakPointObjectsIndex)

ACCESSORS(SharedFunctionInfo, name, Object, kNameOffset)
ACCESSORS(SharedFunctionInfo, instance_class_name, Object,
          kInstanceClassNameOffset)
ACCESSORS(SharedFunctionInfo, function_data, Object,
          kExternalReferenceDataOffset)
ACCESSORS(SharedFunctionInfo, lazy_load_data, Object, kLazyLoadDataOffset)
ACCESSORS(SharedFunctionInfo, script, Object, kScriptOffset)
ACCESSORS(SharedFunctionInfo, debug_info, Object, kDebugInfoOffset)

BOOL_ACCESSORS(FunctionTemplateInfo, flag, hidden_prototype,
               kHiddenPrototypeBit)
BOOL_ACCESSORS(FunctionTemplateInfo, flag, undetectable, kUndetectableBit)
BOOL_ACCESSORS(FunctionTemplateInfo, flag, needs_access_check,
               kNeedsAccessCheckBit)
BOOL_ACCESSORS(SharedFunctionInfo, start_position_and_type, is_expression,
               kIsExpressionBit)
BOOL_ACCESSORS(SharedFunctionInfo, start_position_and_type, is_toplevel,
               kIsTopLevelBit)

INT_ACCESSORS(SharedFunctionInfo, length, kLengthOffset)
INT_ACCESSORS(SharedFunctionInfo, formal_parameter_count,
              kFormalParameterCountOffset)
INT_ACCESSORS(SharedFunctionInfo, expected_nof_properties,
              kExpectedNofPropertiesOffset)
INT_ACCESSORS(SharedFunctionInfo, start_position_and_type,
              kStartPositionAndTypeOffset)
INT_ACCESSORS(SharedFunctionInfo, end_position, kEndPositionOffset)
INT_ACCESSORS(SharedFunctionInfo, function_token_position,
              kFunctionTokenPositionOffset)


void SharedFunctionInfo::DontAdaptArguments() {
  ASSERT(code()->kind() == Code::BUILTIN);
  set_formal_parameter_count(kDontAdaptArgumentsSentinel);
}


int SharedFunctionInfo::start_position() {
  return start_position_and_type() >> kStartPositionShift;
}


void SharedFunctionInfo::set_start_position(int start_position) {
  set_start_position_and_type((start_position << kStartPositionShift)
    | (start_position_and_type() & ~kStartPositionMask));
}


Code* SharedFunctionInfo::code() {
  return Code::cast(READ_FIELD(this, kCodeOffset));
}


void SharedFunctionInfo::set_code(Code* value) {
  WRITE_FIELD(this, kCodeOffset, value);
  WRITE_BARRIER(this, kCodeOffset);
}


bool SharedFunctionInfo::is_compiled() {
  // TODO(1242782): Create a code kind for uncompiled code.
  return code()->kind() != Code::STUB;
}


bool JSFunction::IsBoilerplate() {
  return map() == Heap::boilerplate_function_map();
}


bool JSFunction::IsLoaded() {
  return shared()->lazy_load_data() == Heap::undefined_value();
}


Code* JSFunction::code() {
  return shared()->code();
}


void JSFunction::set_code(Code* value) {
  shared()->set_code(value);
}


Context* JSFunction::context() {
  return Context::cast(READ_FIELD(this, kContextOffset));
}


Object* JSFunction::unchecked_context() {
  return READ_FIELD(this, kContextOffset);
}


void JSFunction::set_context(Object* value) {
  ASSERT(value == Heap::undefined_value() || value->IsContext());
  WRITE_FIELD(this, kContextOffset, value);
  WRITE_BARRIER(this, kContextOffset);
}

ACCESSORS(JSFunction, prototype_or_initial_map, Object,
          kPrototypeOrInitialMapOffset)


Map* JSFunction::initial_map() {
  return Map::cast(prototype_or_initial_map());
}


void JSFunction::set_initial_map(Map* value) {
  set_prototype_or_initial_map(value);
}


bool JSFunction::has_initial_map() {
  return prototype_or_initial_map()->IsMap();
}


bool JSFunction::has_instance_prototype() {
  return has_initial_map() || !prototype_or_initial_map()->IsTheHole();
}


bool JSFunction::has_prototype() {
  return map()->has_non_instance_prototype() || has_instance_prototype();
}


Object* JSFunction::instance_prototype() {
  ASSERT(has_instance_prototype());
  if (has_initial_map()) return initial_map()->prototype();
  // When there is no initial map and the prototype is a JSObject, the
  // initial map field is used for the prototype field.
  return prototype_or_initial_map();
}


Object* JSFunction::prototype() {
  ASSERT(has_prototype());
  // If the function's prototype property has been set to a non-JSObject
  // value, that value is stored in the constructor field of the map.
  if (map()->has_non_instance_prototype()) return map()->constructor();
  return instance_prototype();
}


bool JSFunction::is_compiled() {
  return shared()->is_compiled();
}


Object* JSBuiltinsObject::javascript_builtin(Builtins::JavaScript id) {
  ASSERT(0 <= id && id < kJSBuiltinsCount);
  return READ_FIELD(this, kJSBuiltinsOffset + (id * kPointerSize));
}


void JSBuiltinsObject::set_javascript_builtin(Builtins::JavaScript id,
                                              Object* value) {
  ASSERT(0 <= id && id < kJSBuiltinsCount);
  WRITE_FIELD(this, kJSBuiltinsOffset + (id * kPointerSize), value);
  WRITE_BARRIER(this, kJSBuiltinsOffset + (id * kPointerSize));
}


Address Proxy::proxy() {
  return AddressFrom<Address>(READ_INT_FIELD(this, kProxyOffset));
}


void Proxy::set_proxy(Address value) {
  WRITE_INT_FIELD(this, kProxyOffset, OffsetFrom(value));
}


void Proxy::ProxyIterateBody(ObjectVisitor* visitor) {
  visitor->VisitExternalReference(
      reinterpret_cast<Address *>(FIELD_ADDR(this, kProxyOffset)));
}


ACCESSORS(JSValue, value, Object, kValueOffset)


JSValue* JSValue::cast(Object* obj) {
  ASSERT(obj->IsJSValue());
  ASSERT(HeapObject::cast(obj)->Size() == JSValue::kSize);
  return reinterpret_cast<JSValue*>(obj);
}


INT_ACCESSORS(Code, instruction_size, kInstructionSizeOffset)
INT_ACCESSORS(Code, relocation_size, kRelocationSizeOffset)
INT_ACCESSORS(Code, sinfo_size, kSInfoSizeOffset)


Code::ICTargetState Code::ic_flag() {
  return static_cast<ICTargetState>(READ_BYTE_FIELD(this, kICFlagOffset));
}


void Code::set_ic_flag(ICTargetState value) {
  WRITE_BYTE_FIELD(this, kICFlagOffset, value);
}


byte* Code::instruction_start()  {
  return FIELD_ADDR(this, kHeaderSize);
}


int Code::body_size() {
  return RoundUp(instruction_size() + relocation_size(), kObjectAlignment);
}


byte* Code::relocation_start() {
  return FIELD_ADDR(this, CodeSize() - sinfo_size() - relocation_size());
}


byte* Code::entry() {
  return instruction_start();
}


bool Code::contains(byte* pc) {
  return (instruction_start() <= pc) &&
      (pc < instruction_start() + instruction_size());
}


byte* Code::sinfo_start() {
  return FIELD_ADDR(this, CodeSize() - sinfo_size());
}


ACCESSORS(JSArray, length, Object, kLengthOffset)


ACCESSORS(JSRegExp, data, Object, kDataOffset)
ACCESSORS(JSRegExp, type, Object, kTypeOffset)


JSRegExp::Type JSRegExp::type_tag() {
  return static_cast<JSRegExp::Type>(Smi::cast(type())->value());
}


void JSRegExp::set_type_tag(JSRegExp::Type value) {
  set_type(Smi::FromInt(value));
}


bool JSObject::HasFastElements() {
  return !elements()->IsDictionary();
}


bool JSObject::HasNamedInterceptor() {
  return map()->has_named_interceptor();
}


bool JSObject::HasIndexedInterceptor() {
  return map()->has_indexed_interceptor();
}


Dictionary* JSObject::property_dictionary() {
  ASSERT(!HasFastProperties());
  return Dictionary::cast(properties());
}


Dictionary* JSObject::element_dictionary() {
  ASSERT(!HasFastElements());
  return Dictionary::cast(elements());
}


bool String::HasHashCode() {
  return (length_field() & kHashComputedMask) != 0;
}


uint32_t String::Hash() {
  // Fast case: has hash code already been computed?
  int hash = length_field();
  if (hash & kHashComputedMask) return hash;
  // Slow case: compute hash code and set it..
  return ComputeAndSetHash();
}


bool String::AsArrayIndex(uint32_t* index) {
  int hash = length_field();
  if ((hash & kHashComputedMask) && !(hash & kIsArrayIndexMask)) return false;
  return SlowAsArrayIndex(index);
}


Object* JSObject::GetPrototype() {
  return JSObject::cast(this)->map()->prototype();
}


PropertyAttributes JSObject::GetPropertyAttribute(String* key) {
  return GetPropertyAttributeWithReceiver(this, key);
}


bool JSObject::HasElement(uint32_t index) {
  return HasElementWithReceiver(this, index);
}


bool AccessorInfo::all_can_read() {
  return BooleanBit::get(flag(), kAllCanReadBit);
}


void AccessorInfo::set_all_can_read(bool value) {
  set_flag(BooleanBit::set(flag(), kAllCanReadBit, value));
}


bool AccessorInfo::all_can_write() {
  return BooleanBit::get(flag(), kAllCanWriteBit);
}


void AccessorInfo::set_all_can_write(bool value) {
  set_flag(BooleanBit::set(flag(), kAllCanWriteBit, value));
}


PropertyAttributes AccessorInfo::property_attributes() {
  return AttributesField::decode(static_cast<uint32_t>(flag()->value()));
}


void AccessorInfo::set_property_attributes(PropertyAttributes attributes) {
  ASSERT(AttributesField::is_valid(attributes));
  int rest_value = flag()->value() & ~AttributesField::mask();
  set_flag(Smi::FromInt(rest_value | AttributesField::encode(attributes)));
}

void Dictionary::SetEntry(int entry,
                          Object* key,
                          Object* value,
                          PropertyDetails details) {
  ASSERT(!key->IsString() || details.index() > 0);
  int index = EntryToIndex(entry);
  WriteBarrierMode mode = GetWriteBarrierMode();
  set(index, key, mode);
  set(index+1, value, mode);
  fast_set(this, index+2, details.AsSmi());
}


void Map::ClearCodeCache() {
  // No write barrier is needed since empty_fixed_array is not in new space.
  // Please note this function is used during marking:
  //  - MarkCompactCollector::MarkUnmarkedObject
  ASSERT(!Heap::InNewSpace(Heap::empty_fixed_array()));
  WRITE_FIELD(this, kCodeCacheOffset, Heap::empty_fixed_array());
}


#undef CAST_ACCESSOR
#undef INT_ACCESSORS
#undef SMI_ACCESSORS
#undef ACCESSORS
#undef FIELD_ADDR
#undef READ_FIELD
#undef WRITE_FIELD
#undef WRITE_BARRIER
#undef READ_MEMADDR_FIELD
#undef WRITE_MEMADDR_FIELD
#undef READ_DOUBLE_FIELD
#undef WRITE_DOUBLE_FIELD
#undef READ_INT_FIELD
#undef WRITE_INT_FIELD
#undef READ_SHORT_FIELD
#undef WRITE_SHORT_FIELD
#undef READ_BYTE_FIELD
#undef WRITE_BYTE_FIELD


} }  // namespace v8::internal

#endif  // V8_OBJECTS_INL_H_