mirror of
https://github.com/classilla/tenfourfox.git
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227 lines
5.3 KiB
C++
227 lines
5.3 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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#include "jsweakmap.h"
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#include <string.h>
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#include "jsapi.h"
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#include "jscntxt.h"
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#include "jsfriendapi.h"
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#include "jsobj.h"
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#include "jswrapper.h"
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#include "js/GCAPI.h"
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#include "vm/GlobalObject.h"
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#include "jsobjinlines.h"
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using namespace js;
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using namespace js::gc;
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WeakMapBase::WeakMapBase(JSObject* memOf, Zone* zone)
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: memberOf(memOf),
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zone(zone),
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marked(false)
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{
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MOZ_ASSERT_IF(memberOf, memberOf->compartment()->zone() == zone);
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}
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WeakMapBase::~WeakMapBase()
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{
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MOZ_ASSERT(CurrentThreadIsGCSweeping());
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}
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void
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WeakMapBase::unmarkZone(JS::Zone* zone)
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{
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for (WeakMapBase* m : zone->gcWeakMapList)
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m->marked = false;
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}
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void
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WeakMapBase::markAll(JS::Zone* zone, JSTracer* tracer)
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{
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MOZ_ASSERT(tracer->weakMapAction() != DoNotTraceWeakMaps);
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for (WeakMapBase* m : zone->gcWeakMapList) {
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m->trace(tracer);
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if (m->memberOf)
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TraceEdge(tracer, &m->memberOf, "memberOf");
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}
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}
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bool
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WeakMapBase::markZoneIteratively(JS::Zone* zone, JSTracer* tracer)
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{
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bool markedAny = false;
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for (WeakMapBase* m : zone->gcWeakMapList) {
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if (m->marked && m->traceEntries(tracer))
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markedAny = true;
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}
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return markedAny;
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}
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bool
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WeakMapBase::findInterZoneEdges(JS::Zone* zone)
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{
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for (WeakMapBase* m : zone->gcWeakMapList) {
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if (!m->findZoneEdges())
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return false;
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}
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return true;
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}
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void
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WeakMapBase::sweepZone(JS::Zone* zone)
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{
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for (WeakMapBase* m = zone->gcWeakMapList.getFirst(); m; ) {
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WeakMapBase* next = m->getNext();
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if (m->marked) {
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m->sweep();
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} else {
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/* Destroy the hash map now to catch any use after this point. */
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m->finish();
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m->removeFrom(zone->gcWeakMapList);
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}
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m = next;
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}
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#ifdef DEBUG
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for (WeakMapBase* m : zone->gcWeakMapList) {
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MOZ_ASSERT(m->isInList() && m->marked);
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}
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#endif
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}
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void
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WeakMapBase::traceAllMappings(WeakMapTracer* tracer)
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{
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JSRuntime* rt = tracer->runtime;
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for (ZonesIter zone(rt, SkipAtoms); !zone.done(); zone.next()) {
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for (WeakMapBase* m : zone->gcWeakMapList) {
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// The WeakMapTracer callback is not allowed to GC.
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JS::AutoSuppressGCAnalysis nogc;
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m->traceMappings(tracer);
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}
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}
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}
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bool
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WeakMapBase::saveZoneMarkedWeakMaps(JS::Zone* zone, WeakMapSet& markedWeakMaps)
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{
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for (WeakMapBase* m : zone->gcWeakMapList) {
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if (m->marked && !markedWeakMaps.put(m))
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return false;
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}
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return true;
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}
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void
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WeakMapBase::restoreMarkedWeakMaps(WeakMapSet& markedWeakMaps)
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{
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for (WeakMapSet::Range r = markedWeakMaps.all(); !r.empty(); r.popFront()) {
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WeakMapBase* map = r.front();
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MOZ_ASSERT(map->zone->isGCMarking());
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MOZ_ASSERT(!map->marked);
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map->marked = true;
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}
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}
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bool
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ObjectValueMap::findZoneEdges()
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{
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/*
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* For unmarked weakmap keys with delegates in a different zone, add a zone
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* edge to ensure that the delegate zone finishes marking before the key
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* zone.
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*/
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JS::AutoSuppressGCAnalysis nogc;
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for (Range r = all(); !r.empty(); r.popFront()) {
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JSObject* key = r.front().key();
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if (key->asTenured().isMarked(BLACK) && !key->asTenured().isMarked(GRAY))
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continue;
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JSWeakmapKeyDelegateOp op = key->getClass()->ext.weakmapKeyDelegateOp;
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if (!op)
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continue;
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JSObject* delegate = op(key);
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if (!delegate)
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continue;
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Zone* delegateZone = delegate->zone();
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if (delegateZone == zone || !delegateZone->isGCMarking())
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continue;
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if (!delegateZone->gcZoneGroupEdges.put(key->zone()))
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return false;
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}
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return true;
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}
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ObjectWeakMap::ObjectWeakMap(JSContext* cx)
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: map(cx, nullptr)
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{}
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bool
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ObjectWeakMap::init()
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{
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return map.init();
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}
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JSObject*
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ObjectWeakMap::lookup(const JSObject* obj)
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{
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MOZ_ASSERT(map.initialized());
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if (ObjectValueMap::Ptr p = map.lookup(const_cast<JSObject*>(obj)))
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return &p->value().toObject();
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return nullptr;
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}
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bool
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ObjectWeakMap::add(JSContext* cx, JSObject* obj, JSObject* target)
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{
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MOZ_ASSERT(obj && target);
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MOZ_ASSERT(map.initialized());
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MOZ_ASSERT(!map.has(obj));
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if (!map.put(obj, ObjectValue(*target))) {
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ReportOutOfMemory(cx);
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return false;
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}
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return true;
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}
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void
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ObjectWeakMap::clear()
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{
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MOZ_ASSERT(map.initialized());
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map.clear();
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}
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void
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ObjectWeakMap::trace(JSTracer* trc)
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{
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MOZ_ASSERT(map.initialized());
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map.trace(trc);
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}
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size_t
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ObjectWeakMap::sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
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{
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MOZ_ASSERT(map.initialized());
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return map.sizeOfExcludingThis(mallocSizeOf);
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}
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#ifdef JSGC_HASH_TABLE_CHECKS
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void
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ObjectWeakMap::checkAfterMovingGC()
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{
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MOZ_ASSERT(map.initialized());
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for (ObjectValueMap::Range r = map.all(); !r.empty(); r.popFront()) {
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CheckGCThingAfterMovingGC(r.front().key().get());
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CheckGCThingAfterMovingGC(&r.front().value().toObject());
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}
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}
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#endif // JSGC_HASH_TABLE_CHECKS
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