diff options
Diffstat (limited to 'js/src/gc/GCAPI.cpp')
| -rw-r--r-- | js/src/gc/GCAPI.cpp | 854 |
1 files changed, 854 insertions, 0 deletions
diff --git a/js/src/gc/GCAPI.cpp b/js/src/gc/GCAPI.cpp new file mode 100644 index 0000000000..ab6c3c297a --- /dev/null +++ b/js/src/gc/GCAPI.cpp @@ -0,0 +1,854 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * 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/. */ + +/* + * API functions and methods used by the rest of SpiderMonkey and by embeddings. + */ + +#include "mozilla/TimeStamp.h" + +#include "jsapi.h" +#include "jsfriendapi.h" + +#include "gc/GC.h" +#include "gc/PublicIterators.h" +#include "jit/JitZone.h" +#include "js/HeapAPI.h" +#include "js/Value.h" +#include "util/DifferentialTesting.h" +#include "vm/HelperThreads.h" +#include "vm/Realm.h" +#include "vm/Scope.h" + +#include "gc/Marking-inl.h" +#include "gc/StableCellHasher-inl.h" +#include "vm/GeckoProfiler-inl.h" +#include "vm/JSContext-inl.h" + +using namespace js; +using namespace js::gc; + +using mozilla::TimeStamp; + +extern JS_PUBLIC_API bool js::AddRawValueRoot(JSContext* cx, Value* vp, + const char* name) { + MOZ_ASSERT(vp); + MOZ_ASSERT(name); + bool ok = cx->runtime()->gc.addRoot(vp, name); + if (!ok) { + JS_ReportOutOfMemory(cx); + } + return ok; +} + +extern JS_PUBLIC_API void js::RemoveRawValueRoot(JSContext* cx, Value* vp) { + cx->runtime()->gc.removeRoot(vp); +} + +JS_PUBLIC_API JS::HeapState JS::RuntimeHeapState() { + return TlsContext.get()->runtime()->gc.heapState(); +} + +JS::AutoDisableGenerationalGC::AutoDisableGenerationalGC(JSContext* cx) + : cx(cx) { + if (!cx->generationalDisabled) { + cx->runtime()->gc.evictNursery(JS::GCReason::DISABLE_GENERATIONAL_GC); + cx->nursery().disable(); + } + ++cx->generationalDisabled; + MOZ_ASSERT(cx->nursery().isEmpty()); +} + +JS::AutoDisableGenerationalGC::~AutoDisableGenerationalGC() { + if (--cx->generationalDisabled == 0 && + cx->runtime()->gc.tunables.gcMaxNurseryBytes() > 0) { + cx->nursery().enable(); + } +} + +JS_PUBLIC_API bool JS::IsGenerationalGCEnabled(JSRuntime* rt) { + return !rt->mainContextFromOwnThread()->generationalDisabled; +} + +AutoDisableCompactingGC::AutoDisableCompactingGC(JSContext* cx) : cx(cx) { + ++cx->compactingDisabledCount; + if (cx->runtime()->gc.isIncrementalGCInProgress() && + cx->runtime()->gc.isCompactingGc()) { + FinishGC(cx); + } +} + +AutoDisableCompactingGC::~AutoDisableCompactingGC() { + MOZ_ASSERT(cx->compactingDisabledCount > 0); + --cx->compactingDisabledCount; +} + +#ifdef DEBUG + +/* Should only be called manually under gdb */ +void PreventGCDuringInteractiveDebug() { TlsContext.get()->suppressGC++; } + +#endif + +void js::ReleaseAllJITCode(JS::GCContext* gcx) { + js::CancelOffThreadIonCompile(gcx->runtime()); + + for (ZonesIter zone(gcx->runtime(), SkipAtoms); !zone.done(); zone.next()) { + zone->forceDiscardJitCode(gcx); + if (jit::JitZone* jitZone = zone->jitZone()) { + jitZone->discardStubs(); + } + } +} + +AutoSuppressGC::AutoSuppressGC(JSContext* cx) + : suppressGC_(cx->suppressGC.ref()) { + suppressGC_++; +} + +#ifdef DEBUG +AutoDisableProxyCheck::AutoDisableProxyCheck() { + TlsContext.get()->disableStrictProxyChecking(); +} + +AutoDisableProxyCheck::~AutoDisableProxyCheck() { + TlsContext.get()->enableStrictProxyChecking(); +} + +JS_PUBLIC_API void JS::AssertGCThingMustBeTenured(JSObject* obj) { + MOZ_ASSERT(obj->isTenured()); + MOZ_ASSERT(obj->getClass()->hasFinalize() && + !(obj->getClass()->flags & JSCLASS_SKIP_NURSERY_FINALIZE)); +} + +JS_PUBLIC_API void JS::AssertGCThingIsNotNurseryAllocable(Cell* cell) { + MOZ_ASSERT(cell); + MOZ_ASSERT(!cell->is<JSObject>() && !cell->is<JSString>() && + !cell->is<JS::BigInt>()); +} + +JS_PUBLIC_API void js::gc::AssertGCThingHasType(js::gc::Cell* cell, + JS::TraceKind kind) { + if (!cell) { + MOZ_ASSERT(kind == JS::TraceKind::Null); + return; + } + + MOZ_ASSERT(IsCellPointerValid(cell)); + MOZ_ASSERT(cell->getTraceKind() == kind); +} +#endif + +#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED + +JS::AutoAssertNoGC::AutoAssertNoGC(JSContext* maybecx) { + if (maybecx) { + cx_ = maybecx; + } else if (TlsContext.initialized()) { + cx_ = TlsContext.get(); + } else { + cx_ = nullptr; + } + if (cx_) { + cx_->inUnsafeRegion++; + } +} + +JS::AutoAssertNoGC::~AutoAssertNoGC() { reset(); } + +void JS::AutoAssertNoGC::reset() { + if (cx_) { + MOZ_ASSERT(cx_->inUnsafeRegion > 0); + cx_->inUnsafeRegion--; + cx_ = nullptr; + } +} + +#endif // MOZ_DIAGNOSTIC_ASSERT_ENABLED + +#ifdef DEBUG + +JS::AutoEnterCycleCollection::AutoEnterCycleCollection(JSRuntime* rt) + : runtime_(rt) { + MOZ_ASSERT(CurrentThreadCanAccessRuntime(rt)); + MOZ_ASSERT(!JS::RuntimeHeapIsBusy()); + runtime_->gc.heapState_ = HeapState::CycleCollecting; +} + +JS::AutoEnterCycleCollection::~AutoEnterCycleCollection() { + MOZ_ASSERT(JS::RuntimeHeapIsCycleCollecting()); + runtime_->gc.heapState_ = HeapState::Idle; +} + +JS::AutoAssertGCCallback::AutoAssertGCCallback() : AutoSuppressGCAnalysis() { + MOZ_ASSERT(JS::RuntimeHeapIsCollecting()); +} + +#endif // DEBUG + +JS_PUBLIC_API const char* JS::GCTraceKindToAscii(JS::TraceKind kind) { + switch (kind) { +#define MAP_NAME(name, _0, _1, _2) \ + case JS::TraceKind::name: \ + return "JS " #name; + JS_FOR_EACH_TRACEKIND(MAP_NAME); +#undef MAP_NAME + default: + return "Invalid"; + } +} + +JS_PUBLIC_API size_t JS::GCTraceKindSize(JS::TraceKind kind) { + switch (kind) { +#define MAP_SIZE(name, type, _0, _1) \ + case JS::TraceKind::name: \ + return sizeof(type); + JS_FOR_EACH_TRACEKIND(MAP_SIZE); +#undef MAP_SIZE + default: + return 0; + } +} + +JS::GCCellPtr::GCCellPtr(const Value& v) + : GCCellPtr(v.toGCThing(), v.traceKind()) {} + +JS::TraceKind JS::GCCellPtr::outOfLineKind() const { + MOZ_ASSERT((ptr & OutOfLineTraceKindMask) == OutOfLineTraceKindMask); + MOZ_ASSERT(asCell()->isTenured()); + return MapAllocToTraceKind(asCell()->asTenured().getAllocKind()); +} + +JS_PUBLIC_API void JS::PrepareZoneForGC(JSContext* cx, Zone* zone) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + // If we got the zone from a shared atom, we may have the wrong atoms zone + // here. + if (zone->isAtomsZone()) { + zone = cx->runtime()->atomsZone(); + } + + MOZ_ASSERT(cx->runtime()->gc.hasZone(zone)); + zone->scheduleGC(); +} + +JS_PUBLIC_API void JS::PrepareForFullGC(JSContext* cx) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + cx->runtime()->gc.fullGCRequested = true; + for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) { + zone->scheduleGC(); + } +} + +JS_PUBLIC_API void JS::PrepareForIncrementalGC(JSContext* cx) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + if (!JS::IsIncrementalGCInProgress(cx)) { + return; + } + + for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) { + if (zone->wasGCStarted()) { + zone->scheduleGC(); + } + } +} + +JS_PUBLIC_API bool JS::IsGCScheduled(JSContext* cx) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) { + if (zone->isGCScheduled()) { + return true; + } + } + + return false; +} + +JS_PUBLIC_API void JS::SkipZoneForGC(JSContext* cx, Zone* zone) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + MOZ_ASSERT(cx->runtime()->gc.hasZone(zone)); + + cx->runtime()->gc.fullGCRequested = false; + zone->unscheduleGC(); +} + +static inline void CheckGCOptions(JS::GCOptions options) { + MOZ_ASSERT(options == JS::GCOptions::Normal || + options == JS::GCOptions::Shrink || + options == JS::GCOptions::Shutdown); +} + +JS_PUBLIC_API void JS::NonIncrementalGC(JSContext* cx, JS::GCOptions options, + GCReason reason) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + CheckGCOptions(options); + + cx->runtime()->gc.gc(options, reason); + + MOZ_ASSERT(!IsIncrementalGCInProgress(cx)); +} + +JS_PUBLIC_API void JS::StartIncrementalGC(JSContext* cx, JS::GCOptions options, + GCReason reason, + const js::SliceBudget& budget) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + CheckGCOptions(options); + + cx->runtime()->gc.startGC(options, reason, budget); +} + +JS_PUBLIC_API void JS::IncrementalGCSlice(JSContext* cx, GCReason reason, + const js::SliceBudget& budget) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + cx->runtime()->gc.gcSlice(reason, budget); +} + +JS_PUBLIC_API bool JS::IncrementalGCHasForegroundWork(JSContext* cx) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + return cx->runtime()->gc.hasForegroundWork(); +} + +JS_PUBLIC_API void JS::FinishIncrementalGC(JSContext* cx, GCReason reason) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + cx->runtime()->gc.finishGC(reason); +} + +JS_PUBLIC_API void JS::AbortIncrementalGC(JSContext* cx) { + AssertHeapIsIdle(); + CHECK_THREAD(cx); + + if (IsIncrementalGCInProgress(cx)) { + cx->runtime()->gc.abortGC(); + } +} + +char16_t* JS::GCDescription::formatSliceMessage(JSContext* cx) const { + UniqueChars cstr = cx->runtime()->gc.stats().formatCompactSliceMessage(); + + size_t nchars = strlen(cstr.get()); + UniqueTwoByteChars out(js_pod_malloc<char16_t>(nchars + 1)); + if (!out) { + return nullptr; + } + out.get()[nchars] = 0; + + CopyAndInflateChars(out.get(), cstr.get(), nchars); + return out.release(); +} + +char16_t* JS::GCDescription::formatSummaryMessage(JSContext* cx) const { + UniqueChars cstr = cx->runtime()->gc.stats().formatCompactSummaryMessage(); + + size_t nchars = strlen(cstr.get()); + UniqueTwoByteChars out(js_pod_malloc<char16_t>(nchars + 1)); + if (!out) { + return nullptr; + } + out.get()[nchars] = 0; + + CopyAndInflateChars(out.get(), cstr.get(), nchars); + return out.release(); +} + +JS::dbg::GarbageCollectionEvent::Ptr JS::GCDescription::toGCEvent( + JSContext* cx) const { + return JS::dbg::GarbageCollectionEvent::Create( + cx->runtime(), cx->runtime()->gc.stats(), + cx->runtime()->gc.majorGCCount()); +} + +TimeStamp JS::GCDescription::startTime(JSContext* cx) const { + return cx->runtime()->gc.stats().start(); +} + +TimeStamp JS::GCDescription::endTime(JSContext* cx) const { + return cx->runtime()->gc.stats().end(); +} + +TimeStamp JS::GCDescription::lastSliceStart(JSContext* cx) const { + return cx->runtime()->gc.stats().slices().back().start; +} + +TimeStamp JS::GCDescription::lastSliceEnd(JSContext* cx) const { + return cx->runtime()->gc.stats().slices().back().end; +} + +JS::UniqueChars JS::GCDescription::sliceToJSONProfiler(JSContext* cx) const { + size_t slices = cx->runtime()->gc.stats().slices().length(); + MOZ_ASSERT(slices > 0); + return cx->runtime()->gc.stats().renderJsonSlice(slices - 1); +} + +JS::UniqueChars JS::GCDescription::formatJSONProfiler(JSContext* cx) const { + return cx->runtime()->gc.stats().renderJsonMessage(); +} + +JS_PUBLIC_API JS::UniqueChars JS::MinorGcToJSON(JSContext* cx) { + JSRuntime* rt = cx->runtime(); + return rt->gc.stats().renderNurseryJson(); +} + +JS_PUBLIC_API JS::GCSliceCallback JS::SetGCSliceCallback( + JSContext* cx, GCSliceCallback callback) { + return cx->runtime()->gc.setSliceCallback(callback); +} + +JS_PUBLIC_API JS::DoCycleCollectionCallback JS::SetDoCycleCollectionCallback( + JSContext* cx, JS::DoCycleCollectionCallback callback) { + return cx->runtime()->gc.setDoCycleCollectionCallback(callback); +} + +JS_PUBLIC_API bool JS::AddGCNurseryCollectionCallback( + JSContext* cx, GCNurseryCollectionCallback callback, void* data) { + return cx->runtime()->gc.addNurseryCollectionCallback(callback, data); +} + +JS_PUBLIC_API void JS::RemoveGCNurseryCollectionCallback( + JSContext* cx, GCNurseryCollectionCallback callback, void* data) { + return cx->runtime()->gc.removeNurseryCollectionCallback(callback, data); +} + +JS_PUBLIC_API void JS::SetLowMemoryState(JSContext* cx, bool newState) { + return cx->runtime()->gc.setLowMemoryState(newState); +} + +JS_PUBLIC_API void JS::DisableIncrementalGC(JSContext* cx) { + cx->runtime()->gc.disallowIncrementalGC(); +} + +JS_PUBLIC_API bool JS::IsIncrementalGCEnabled(JSContext* cx) { + GCRuntime& gc = cx->runtime()->gc; + return gc.isIncrementalGCEnabled() && gc.isIncrementalGCAllowed(); +} + +JS_PUBLIC_API bool JS::IsIncrementalGCInProgress(JSContext* cx) { + return cx->runtime()->gc.isIncrementalGCInProgress(); +} + +JS_PUBLIC_API bool JS::IsIncrementalGCInProgress(JSRuntime* rt) { + return rt->gc.isIncrementalGCInProgress() && + !rt->gc.isVerifyPreBarriersEnabled(); +} + +JS_PUBLIC_API bool JS::IsIncrementalBarrierNeeded(JSContext* cx) { + if (JS::RuntimeHeapIsBusy()) { + return false; + } + + auto state = cx->runtime()->gc.state(); + return state != gc::State::NotActive && state <= gc::State::Sweep; +} + +JS_PUBLIC_API void JS::IncrementalPreWriteBarrier(JSObject* obj) { + if (!obj) { + return; + } + + AutoGeckoProfilerEntry profilingStackFrame( + TlsContext.get(), "IncrementalPreWriteBarrier(JSObject*)", + JS::ProfilingCategoryPair::GCCC_Barrier); + PreWriteBarrier(obj); +} + +JS_PUBLIC_API void JS::IncrementalPreWriteBarrier(GCCellPtr thing) { + if (!thing) { + return; + } + + AutoGeckoProfilerEntry profilingStackFrame( + TlsContext.get(), "IncrementalPreWriteBarrier(GCCellPtr)", + JS::ProfilingCategoryPair::GCCC_Barrier); + CellPtrPreWriteBarrier(thing); +} + +JS_PUBLIC_API bool JS::WasIncrementalGC(JSRuntime* rt) { + return rt->gc.isIncrementalGc(); +} + +bool js::gc::CreateUniqueIdForNativeObject(NativeObject* nobj, uint64_t* uidp) { + JSRuntime* runtime = nobj->runtimeFromMainThread(); + *uidp = NextCellUniqueId(runtime); + JSContext* cx = runtime->mainContextFromOwnThread(); + return nobj->setUniqueId(cx, *uidp); +} + +bool js::gc::CreateUniqueIdForNonNativeObject(Cell* cell, + UniqueIdMap::AddPtr ptr, + uint64_t* uidp) { + // If the cell is in the nursery, hopefully unlikely, then we need to tell the + // nursery about it so that it can sweep the uid if the thing does not get + // tenured. + JSRuntime* runtime = cell->runtimeFromMainThread(); + if (IsInsideNursery(cell) && + !runtime->gc.nursery().addedUniqueIdToCell(cell)) { + return false; + } + + // Set a new uid on the cell. + *uidp = NextCellUniqueId(runtime); + return cell->zone()->uniqueIds().add(ptr, cell, *uidp); +} + +uint64_t js::gc::NextCellUniqueId(JSRuntime* rt) { + return rt->gc.nextCellUniqueId(); +} + +namespace js { + +static const struct GCParamInfo { + const char* name; + JSGCParamKey key; + bool writable; +} GCParameters[] = { +#define DEFINE_PARAM_INFO(name, key, writable) {name, key, writable}, + FOR_EACH_GC_PARAM(DEFINE_PARAM_INFO) +#undef DEFINE_PARAM_INFO +}; + +bool GetGCParameterInfo(const char* name, JSGCParamKey* keyOut, + bool* writableOut) { + MOZ_ASSERT(keyOut); + MOZ_ASSERT(writableOut); + + for (const GCParamInfo& info : GCParameters) { + if (strcmp(name, info.name) == 0) { + *keyOut = info.key; + *writableOut = info.writable; + return true; + } + } + + return false; +} + +namespace gc { +namespace MemInfo { + +static bool GCBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.heapSize.bytes())); + return true; +} + +static bool MallocBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + size_t bytes = 0; + for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) { + bytes += zone->mallocHeapSize.bytes(); + } + args.rval().setNumber(bytes); + return true; +} + +static bool GCMaxBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.tunables.gcMaxBytes())); + return true; +} + +static bool GCHighFreqGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setBoolean( + cx->runtime()->gc.schedulingState.inHighFrequencyGCMode()); + return true; +} + +static bool GCNumberGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.gcNumber())); + return true; +} + +static bool MajorGCCountGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.majorGCCount())); + return true; +} + +static bool MinorGCCountGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.minorGCCount())); + return true; +} + +static bool GCSliceCountGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.gcSliceCount())); + return true; +} + +static bool GCCompartmentCount(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + size_t count = 0; + for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) { + count += zone->compartments().length(); + } + + args.rval().setNumber(double(count)); + return true; +} + +static bool GCLastStartReason(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + const char* reason = ExplainGCReason(cx->runtime()->gc.lastStartReason()); + RootedString str(cx, JS_NewStringCopyZ(cx, reason)); + if (!str) { + return false; + } + + args.rval().setString(str); + return true; +} + +static bool ZoneGCBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->zone()->gcHeapSize.bytes())); + return true; +} + +static bool ZoneGCTriggerBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->zone()->gcHeapThreshold.startBytes())); + return true; +} + +static bool ZoneGCAllocTriggerGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + bool highFrequency = + cx->runtime()->gc.schedulingState.inHighFrequencyGCMode(); + args.rval().setNumber( + double(cx->zone()->gcHeapThreshold.eagerAllocTrigger(highFrequency))); + return true; +} + +static bool ZoneMallocBytesGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->zone()->mallocHeapSize.bytes())); + return true; +} + +static bool ZoneMallocTriggerBytesGetter(JSContext* cx, unsigned argc, + Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->zone()->mallocHeapThreshold.startBytes())); + return true; +} + +static bool ZoneGCNumberGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setNumber(double(cx->runtime()->gc.gcNumber())); + return true; +} + +#ifdef DEBUG +static bool DummyGetter(JSContext* cx, unsigned argc, Value* vp) { + CallArgs args = CallArgsFromVp(argc, vp); + args.rval().setUndefined(); + return true; +} +#endif + +} /* namespace MemInfo */ + +JSObject* NewMemoryInfoObject(JSContext* cx) { + RootedObject obj(cx, JS_NewObject(cx, nullptr)); + if (!obj) { + return nullptr; + } + + using namespace MemInfo; + struct NamedGetter { + const char* name; + JSNative getter; + } getters[] = {{"gcBytes", GCBytesGetter}, + {"gcMaxBytes", GCMaxBytesGetter}, + {"mallocBytes", MallocBytesGetter}, + {"gcIsHighFrequencyMode", GCHighFreqGetter}, + {"gcNumber", GCNumberGetter}, + {"majorGCCount", MajorGCCountGetter}, + {"minorGCCount", MinorGCCountGetter}, + {"sliceCount", GCSliceCountGetter}, + {"compartmentCount", GCCompartmentCount}, + {"lastStartReason", GCLastStartReason}}; + + for (auto pair : getters) { + JSNative getter = pair.getter; + +#ifdef DEBUG + if (js::SupportDifferentialTesting()) { + getter = DummyGetter; + } +#endif + + if (!JS_DefineProperty(cx, obj, pair.name, getter, nullptr, + JSPROP_ENUMERATE)) { + return nullptr; + } + } + + RootedObject zoneObj(cx, JS_NewObject(cx, nullptr)); + if (!zoneObj) { + return nullptr; + } + + if (!JS_DefineProperty(cx, obj, "zone", zoneObj, JSPROP_ENUMERATE)) { + return nullptr; + } + + struct NamedZoneGetter { + const char* name; + JSNative getter; + } zoneGetters[] = {{"gcBytes", ZoneGCBytesGetter}, + {"gcTriggerBytes", ZoneGCTriggerBytesGetter}, + {"gcAllocTrigger", ZoneGCAllocTriggerGetter}, + {"mallocBytes", ZoneMallocBytesGetter}, + {"mallocTriggerBytes", ZoneMallocTriggerBytesGetter}, + {"gcNumber", ZoneGCNumberGetter}}; + + for (auto pair : zoneGetters) { + JSNative getter = pair.getter; + +#ifdef DEBUG + if (js::SupportDifferentialTesting()) { + getter = DummyGetter; + } +#endif + + if (!JS_DefineProperty(cx, zoneObj, pair.name, getter, nullptr, + JSPROP_ENUMERATE)) { + return nullptr; + } + } + + return obj; +} + +const char* StateName(State state) { + switch (state) { +#define MAKE_CASE(name) \ + case State::name: \ + return #name; + GCSTATES(MAKE_CASE) +#undef MAKE_CASE + } + MOZ_CRASH("Invalid gc::State enum value"); +} + +const char* StateName(JS::Zone::GCState state) { + switch (state) { + case JS::Zone::NoGC: + return "NoGC"; + case JS::Zone::Prepare: + return "Prepare"; + case JS::Zone::MarkBlackOnly: + return "MarkBlackOnly"; + case JS::Zone::MarkBlackAndGray: + return "MarkBlackAndGray"; + case JS::Zone::Sweep: + return "Sweep"; + case JS::Zone::Finished: + return "Finished"; + case JS::Zone::Compact: + return "Compact"; + case JS::Zone::VerifyPreBarriers: + return "VerifyPreBarriers"; + case JS::Zone::Limit: + break; + } + MOZ_CRASH("Invalid Zone::GCState enum value"); +} + +const char* CellColorName(CellColor color) { + switch (color) { + case CellColor::White: + return "white"; + case CellColor::Black: + return "black"; + case CellColor::Gray: + return "gray"; + default: + MOZ_CRASH("Unexpected cell color"); + } +} + +} /* namespace gc */ +} /* namespace js */ + +JS_PUBLIC_API void js::gc::FinalizeDeadNurseryObject(JSContext* cx, + JSObject* obj) { + CHECK_THREAD(cx); + MOZ_ASSERT(JS::RuntimeHeapIsMinorCollecting()); + + MOZ_ASSERT(obj); + MOZ_ASSERT(IsInsideNursery(obj)); + MOZ_ASSERT(!IsForwarded(obj)); + + const JSClass* jsClass = JS::GetClass(obj); + jsClass->doFinalize(cx->gcContext(), obj); +} + +JS_PUBLIC_API void js::gc::SetPerformanceHint(JSContext* cx, + PerformanceHint hint) { + CHECK_THREAD(cx); + MOZ_ASSERT(!JS::RuntimeHeapIsCollecting()); + + cx->runtime()->gc.setPerformanceHint(hint); +} + +AutoSelectGCHeap::AutoSelectGCHeap(JSContext* cx, + size_t allowedNurseryCollections) + : cx_(cx), allowedNurseryCollections_(allowedNurseryCollections) { + JS::AddGCNurseryCollectionCallback(cx, &NurseryCollectionCallback, this); +} + +AutoSelectGCHeap::~AutoSelectGCHeap() { + JS::RemoveGCNurseryCollectionCallback(cx_, &NurseryCollectionCallback, this); +} + +/* static */ +void AutoSelectGCHeap::NurseryCollectionCallback(JSContext* cx, + JS::GCNurseryProgress progress, + JS::GCReason reason, + void* data) { + if (progress == JS::GCNurseryProgress::GC_NURSERY_COLLECTION_END) { + static_cast<AutoSelectGCHeap*>(data)->onNurseryCollectionEnd(); + } +} + +void AutoSelectGCHeap::onNurseryCollectionEnd() { + if (allowedNurseryCollections_ != 0) { + allowedNurseryCollections_--; + return; + } + + heap_ = gc::Heap::Tenured; +} + +JS_PUBLIC_API void js::gc::LockStoreBuffer(JSRuntime* runtime) { + MOZ_ASSERT(runtime); + runtime->gc.lockStoreBuffer(); +} + +JS_PUBLIC_API void js::gc::UnlockStoreBuffer(JSRuntime* runtime) { + MOZ_ASSERT(runtime); + runtime->gc.unlockStoreBuffer(); +} |