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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_OBJECTS_MAP_INL_H_
#define V8_OBJECTS_MAP_INL_H_
#include "src/field-type.h"
#include "src/objects/map.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
CAST_ACCESSOR(Map)
InterceptorInfo* Map::GetNamedInterceptor() {
DCHECK(has_named_interceptor());
FunctionTemplateInfo* info = GetFunctionTemplateInfo();
return InterceptorInfo::cast(info->named_property_handler());
}
InterceptorInfo* Map::GetIndexedInterceptor() {
DCHECK(has_indexed_interceptor());
FunctionTemplateInfo* info = GetFunctionTemplateInfo();
return InterceptorInfo::cast(info->indexed_property_handler());
}
bool Map::IsInplaceGeneralizableField(PropertyConstness constness,
Representation representation,
FieldType* field_type) {
if (FLAG_track_constant_fields && FLAG_modify_map_inplace &&
(constness == kConst)) {
// kConst -> kMutable field generalization may happen in-place.
return true;
}
if (representation.IsHeapObject() && !field_type->IsAny()) {
return true;
}
return false;
}
bool Map::CanHaveFastTransitionableElementsKind(InstanceType instance_type) {
return instance_type == JS_ARRAY_TYPE || instance_type == JS_VALUE_TYPE ||
instance_type == JS_ARGUMENTS_TYPE;
}
bool Map::CanHaveFastTransitionableElementsKind() const {
return CanHaveFastTransitionableElementsKind(instance_type());
}
// static
void Map::GeneralizeIfCanHaveTransitionableFastElementsKind(
Isolate* isolate, InstanceType instance_type, PropertyConstness* constness,
Representation* representation, Handle<FieldType>* field_type) {
if (CanHaveFastTransitionableElementsKind(instance_type)) {
// We don't support propagation of field generalization through elements
// kind transitions because they are inserted into the transition tree
// before field transitions. In order to avoid complexity of handling
// such a case we ensure that all maps with transitionable elements kinds
// do not have fields that can be generalized in-place (without creation
// of a new map).
if (FLAG_track_constant_fields && FLAG_modify_map_inplace) {
// The constness is either already kMutable or should become kMutable if
// it was kConst.
*constness = kMutable;
}
if (representation->IsHeapObject()) {
// The field type is either already Any or should become Any if it was
// something else.
*field_type = FieldType::Any(isolate);
}
}
}
int NormalizedMapCache::GetIndex(Handle<Map> map) {
return map->Hash() % NormalizedMapCache::kEntries;
}
bool NormalizedMapCache::IsNormalizedMapCache(const HeapObject* obj) {
if (!obj->IsFixedArray()) return false;
if (FixedArray::cast(obj)->length() != NormalizedMapCache::kEntries) {
return false;
}
#ifdef VERIFY_HEAP
if (FLAG_verify_heap) {
reinterpret_cast<NormalizedMapCache*>(const_cast<HeapObject*>(obj))
->NormalizedMapCacheVerify();
}
#endif
return true;
}
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_MAP_INL_H_
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