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cf984dfab1
--HG-- extra : rebase_source : 24f858eff637994394e6e9ec0f5ba01add2fbbf7
91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jswatchpoint_h
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#define jswatchpoint_h
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#include "jsalloc.h"
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#include "gc/Barrier.h"
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#include "js/HashTable.h"
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namespace js {
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struct WeakMapTracer;
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struct WatchKey {
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WatchKey() {}
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WatchKey(JSObject* obj, jsid id) : object(obj), id(id) {}
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WatchKey(const WatchKey& key) : object(key.object.get()), id(key.id.get()) {}
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// These are traced unconditionally during minor GC, so do not require
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// post-barriers.
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PreBarrieredObject object;
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PreBarrieredId id;
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bool operator!=(const WatchKey& other) const {
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return object != other.object || id != other.id;
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}
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};
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typedef bool
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(* JSWatchPointHandler)(JSContext* cx, JSObject* obj, jsid id, JS::Value old,
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JS::Value* newp, void* closure);
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struct Watchpoint {
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JSWatchPointHandler handler;
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PreBarrieredObject closure; /* This is always marked in minor GCs and so doesn't require a postbarrier. */
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bool held; /* true if currently running handler */
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Watchpoint(JSWatchPointHandler handler, JSObject* closure, bool held)
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: handler(handler), closure(closure), held(held) {}
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};
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struct WatchKeyHasher
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{
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typedef WatchKey Lookup;
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static inline js::HashNumber hash(const Lookup& key);
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static bool match(const WatchKey& k, const Lookup& l) {
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return MovableCellHasher<PreBarrieredObject>::match(k.object, l.object) &&
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DefaultHasher<PreBarrieredId>::match(k.id, l.id);
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}
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static void rekey(WatchKey& k, const WatchKey& newKey) {
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k.object.unsafeSet(newKey.object);
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k.id.unsafeSet(newKey.id);
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}
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};
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class WatchpointMap {
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public:
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typedef HashMap<WatchKey, Watchpoint, WatchKeyHasher, SystemAllocPolicy> Map;
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bool init();
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bool watch(JSContext* cx, HandleObject obj, HandleId id,
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JSWatchPointHandler handler, HandleObject closure);
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void unwatch(JSObject* obj, jsid id,
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JSWatchPointHandler* handlerp, JSObject** closurep);
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void unwatchObject(JSObject* obj);
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void clear();
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bool triggerWatchpoint(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp);
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bool markIteratively(JSTracer* trc);
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void markAll(JSTracer* trc);
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static void sweepAll(JSRuntime* rt);
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void sweep();
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static void traceAll(WeakMapTracer* trc);
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void trace(WeakMapTracer* trc);
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private:
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Map map;
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};
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} // namespace js
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#endif /* jswatchpoint_h */
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