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// Copyright 2018 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_JS_WEAK_REFS_H_
#define V8_OBJECTS_JS_WEAK_REFS_H_
#include "src/objects/js-objects.h"
#include "torque-generated/bit-fields.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
class NativeContext;
class WeakCell;
#include "torque-generated/src/objects/js-weak-refs-tq.inc"
// FinalizationRegistry object from the JS Weak Refs spec proposal:
// https://github.com/tc39/proposal-weakrefs
class JSFinalizationRegistry
: public TorqueGeneratedJSFinalizationRegistry<JSFinalizationRegistry,
JSObject> {
public:
DECL_PRINTER(JSFinalizationRegistry)
EXPORT_DECL_VERIFIER(JSFinalizationRegistry)
DECL_BOOLEAN_ACCESSORS(scheduled_for_cleanup)
class BodyDescriptor;
inline static void RegisterWeakCellWithUnregisterToken(
Handle<JSFinalizationRegistry> finalization_registry,
Handle<WeakCell> weak_cell, Isolate* isolate);
inline static bool Unregister(
Handle<JSFinalizationRegistry> finalization_registry,
Handle<HeapObject> unregister_token, Isolate* isolate);
// RemoveUnregisterToken is called from both Unregister and during GC. Since
// it modifies slots in key_map and WeakCells and the normal write barrier is
// disabled during GC, we need to tell the GC about the modified slots via the
// gc_notify_updated_slot function.
enum RemoveUnregisterTokenMode {
kRemoveMatchedCellsFromRegistry,
kKeepMatchedCellsInRegistry
};
template <typename GCNotifyUpdatedSlotCallback>
inline bool RemoveUnregisterToken(
Tagged<HeapObject> unregister_token, Isolate* isolate,
RemoveUnregisterTokenMode removal_mode,
GCNotifyUpdatedSlotCallback gc_notify_updated_slot);
// Returns true if the cleared_cells list is non-empty.
inline bool NeedsCleanup() const;
// Remove the already-popped weak_cell from its unregister token linked list,
// as well as removing the entry from the key map if it is the only WeakCell
// with its unregister token. This method cannot GC and does not shrink the
// key map. Asserts that weak_cell has a non-undefined unregister token.
//
// It takes raw Addresses because it is called from CSA and Torque.
V8_EXPORT_PRIVATE static void RemoveCellFromUnregisterTokenMap(
Isolate* isolate, Address raw_finalization_registry,
Address raw_weak_cell);
// Bitfields in flags.
DEFINE_TORQUE_GENERATED_FINALIZATION_REGISTRY_FLAGS()
TQ_OBJECT_CONSTRUCTORS(JSFinalizationRegistry)
};
// Internal object for storing weak references in JSFinalizationRegistry.
class WeakCell : public TorqueGeneratedWeakCell<WeakCell, HeapObject> {
public:
EXPORT_DECL_VERIFIER(WeakCell)
class BodyDescriptor;
// Provide relaxed load access to target field.
inline Tagged<HeapObject> relaxed_target() const;
// Provide relaxed load access to the unregister token field.
inline Tagged<HeapObject> relaxed_unregister_token() const;
// Nullify is called during GC and it modifies the pointers in WeakCell and
// JSFinalizationRegistry. Thus we need to tell the GC about the modified
// slots via the gc_notify_updated_slot function. The normal write barrier is
// not enough, since it's disabled before GC.
template <typename GCNotifyUpdatedSlotCallback>
inline void Nullify(Isolate* isolate,
GCNotifyUpdatedSlotCallback gc_notify_updated_slot);
inline void RemoveFromFinalizationRegistryCells(Isolate* isolate);
TQ_OBJECT_CONSTRUCTORS(WeakCell)
};
class JSWeakRef : public TorqueGeneratedJSWeakRef<JSWeakRef, JSObject> {
public:
DECL_PRINTER(JSWeakRef)
EXPORT_DECL_VERIFIER(JSWeakRef)
class BodyDescriptor;
TQ_OBJECT_CONSTRUCTORS(JSWeakRef)
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_JS_WEAK_REFS_H_
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