https://github.com/mozilla/gecko-dev
Tip revision: 2184b6756754ce9727f02b314ff13701993a5ac6 authored by ffxbld on 17 March 2017, 05:39:03 UTC
Added FENNEC_52_0_1_RELEASE FENNEC_52_0_1_BUILD1 tag(s) for changeset c2473a54d5d4. DONTBUILD CLOSED TREE a=release
Added FENNEC_52_0_1_RELEASE FENNEC_52_0_1_BUILD1 tag(s) for changeset c2473a54d5d4. DONTBUILD CLOSED TREE a=release
Tip revision: 2184b67
jsweakmap.cpp
/* -*- 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 http://mozilla.org/MPL/2.0/. */
#include "jsweakmap.h"
#include <string.h>
#include "jsapi.h"
#include "jscntxt.h"
#include "jsfriendapi.h"
#include "jsobj.h"
#include "jswrapper.h"
#include "js/GCAPI.h"
#include "vm/GlobalObject.h"
#include "jsobjinlines.h"
using namespace js;
using namespace js::gc;
WeakMapBase::WeakMapBase(JSObject* memOf, Zone* zone)
: memberOf(memOf),
zone(zone),
marked(false)
{
MOZ_ASSERT_IF(memberOf, memberOf->compartment()->zone() == zone);
}
WeakMapBase::~WeakMapBase()
{
MOZ_ASSERT(CurrentThreadIsGCSweeping());
}
void
WeakMapBase::unmarkZone(JS::Zone* zone)
{
for (WeakMapBase* m : zone->gcWeakMapList)
m->marked = false;
}
void
WeakMapBase::markAll(JS::Zone* zone, JSTracer* tracer)
{
MOZ_ASSERT(tracer->weakMapAction() != DoNotTraceWeakMaps);
for (WeakMapBase* m : zone->gcWeakMapList) {
m->trace(tracer);
TraceNullableEdge(tracer, &m->memberOf, "memberOf");
}
}
bool
WeakMapBase::markZoneIteratively(JS::Zone* zone, JSTracer* tracer)
{
bool markedAny = false;
for (WeakMapBase* m : zone->gcWeakMapList) {
if (m->marked && m->traceEntries(tracer))
markedAny = true;
}
return markedAny;
}
bool
WeakMapBase::findInterZoneEdges(JS::Zone* zone)
{
for (WeakMapBase* m : zone->gcWeakMapList) {
if (!m->findZoneEdges())
return false;
}
return true;
}
void
WeakMapBase::sweepZone(JS::Zone* zone)
{
for (WeakMapBase* m = zone->gcWeakMapList.getFirst(); m; ) {
WeakMapBase* next = m->getNext();
if (m->marked) {
m->sweep();
} else {
/* Destroy the hash map now to catch any use after this point. */
m->finish();
m->removeFrom(zone->gcWeakMapList);
}
m = next;
}
#ifdef DEBUG
for (WeakMapBase* m : zone->gcWeakMapList)
MOZ_ASSERT(m->isInList() && m->marked);
#endif
}
void
WeakMapBase::traceAllMappings(WeakMapTracer* tracer)
{
JSRuntime* rt = tracer->context;
for (ZonesIter zone(rt, SkipAtoms); !zone.done(); zone.next()) {
for (WeakMapBase* m : zone->gcWeakMapList) {
// The WeakMapTracer callback is not allowed to GC.
JS::AutoSuppressGCAnalysis nogc;
m->traceMappings(tracer);
}
}
}
bool
WeakMapBase::saveZoneMarkedWeakMaps(JS::Zone* zone, WeakMapSet& markedWeakMaps)
{
for (WeakMapBase* m : zone->gcWeakMapList) {
if (m->marked && !markedWeakMaps.put(m))
return false;
}
return true;
}
void
WeakMapBase::restoreMarkedWeakMaps(WeakMapSet& markedWeakMaps)
{
for (WeakMapSet::Range r = markedWeakMaps.all(); !r.empty(); r.popFront()) {
WeakMapBase* map = r.front();
MOZ_ASSERT(map->zone->isGCMarking());
MOZ_ASSERT(!map->marked);
map->marked = true;
}
}
bool
ObjectValueMap::findZoneEdges()
{
/*
* For unmarked weakmap keys with delegates in a different zone, add a zone
* edge to ensure that the delegate zone finishes marking before the key
* zone.
*/
JS::AutoSuppressGCAnalysis nogc;
for (Range r = all(); !r.empty(); r.popFront()) {
JSObject* key = r.front().key();
if (key->asTenured().isMarked(BLACK) && !key->asTenured().isMarked(GRAY))
continue;
JSObject* delegate = getDelegate(key);
if (!delegate)
continue;
Zone* delegateZone = delegate->zone();
if (delegateZone == zone || !delegateZone->isGCMarking())
continue;
if (!delegateZone->gcZoneGroupEdges.put(key->zone()))
return false;
}
return true;
}
ObjectWeakMap::ObjectWeakMap(JSContext* cx)
: map(cx, nullptr)
{}
bool
ObjectWeakMap::init()
{
return map.init();
}
JSObject*
ObjectWeakMap::lookup(const JSObject* obj)
{
MOZ_ASSERT(map.initialized());
if (ObjectValueMap::Ptr p = map.lookup(const_cast<JSObject*>(obj)))
return &p->value().toObject();
return nullptr;
}
bool
ObjectWeakMap::add(JSContext* cx, JSObject* obj, JSObject* target)
{
MOZ_ASSERT(obj && target);
MOZ_ASSERT(map.initialized());
MOZ_ASSERT(!map.has(obj));
if (!map.put(obj, ObjectValue(*target))) {
ReportOutOfMemory(cx);
return false;
}
return true;
}
void
ObjectWeakMap::clear()
{
MOZ_ASSERT(map.initialized());
map.clear();
}
void
ObjectWeakMap::trace(JSTracer* trc)
{
MOZ_ASSERT(map.initialized());
map.trace(trc);
}
size_t
ObjectWeakMap::sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
{
MOZ_ASSERT(map.initialized());
return map.sizeOfExcludingThis(mallocSizeOf);
}
#ifdef JSGC_HASH_TABLE_CHECKS
void
ObjectWeakMap::checkAfterMovingGC()
{
MOZ_ASSERT(map.initialized());
for (ObjectValueMap::Range r = map.all(); !r.empty(); r.popFront()) {
CheckGCThingAfterMovingGC(r.front().key().get());
CheckGCThingAfterMovingGC(&r.front().value().toObject());
}
}
#endif // JSGC_HASH_TABLE_CHECKS