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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef jswatchpoint_h
#define jswatchpoint_h
#include "jsalloc.h"
#include "gc/Barrier.h"
#include "js/HashTable.h"
namespace js {
struct WeakMapTracer;
struct WatchKey {
WatchKey() {}
WatchKey(JSObject* obj, jsid id) : object(obj), id(id) {}
WatchKey(const WatchKey& key) : object(key.object.get()), id( {}
// These are traced unconditionally during minor GC, so do not require
// post-barriers.
PreBarrieredObject object;
PreBarrieredId id;
bool operator!=(const WatchKey& other) const {
return object != other.object || id !=;
typedef bool
(* JSWatchPointHandler)(JSContext* cx, JSObject* obj, jsid id, JS::Value old,
JS::Value* newp, void* closure);
struct Watchpoint {
JSWatchPointHandler handler;
PreBarrieredObject closure; /* This is always marked in minor GCs and so doesn't require a postbarrier. */
bool held; /* true if currently running handler */
Watchpoint(JSWatchPointHandler handler, JSObject* closure, bool held)
: handler(handler), closure(closure), held(held) {}
struct WatchKeyHasher
typedef WatchKey Lookup;
static inline js::HashNumber hash(const Lookup& key);
static bool match(const WatchKey& k, const Lookup& l) {
return MovableCellHasher<PreBarrieredObject>::match(k.object, l.object) &&
static void rekey(WatchKey& k, const WatchKey& newKey) {
class WatchpointMap {
typedef HashMap<WatchKey, Watchpoint, WatchKeyHasher, SystemAllocPolicy> Map;
bool init();
bool watch(JSContext* cx, HandleObject obj, HandleId id,
JSWatchPointHandler handler, HandleObject closure);
void unwatch(JSObject* obj, jsid id,
JSWatchPointHandler* handlerp, JSObject** closurep);
void unwatchObject(JSObject* obj);
void clear();
bool triggerWatchpoint(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp);
bool markIteratively(JSTracer* trc);
void markAll(JSTracer* trc);
static void sweepAll(JSRuntime* rt);
void sweep();
static void traceAll(WeakMapTracer* trc);
void trace(WeakMapTracer* trc);
Map map;
} // namespace js
#endif /* jswatchpoint_h */