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-rw-r--r--js/src/gc/GCAPI.cpp798
1 files changed, 798 insertions, 0 deletions
diff --git a/js/src/gc/GCAPI.cpp b/js/src/gc/GCAPI.cpp
new file mode 100644
index 0000000000..7911baaf93
--- /dev/null
+++ b/js/src/gc/GCAPI.cpp
@@ -0,0 +1,798 @@
+/* -*- 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/JitRealm.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);
+ }
+
+ for (RealmsIter realm(gcx->runtime()); !realm.done(); realm.next()) {
+ if (jit::JitRealm* jitRealm = realm->jitRealm()) {
+ jitRealm->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() {
+ if (cx_) {
+ MOZ_ASSERT(cx_->inUnsafeRegion > 0);
+ cx_->inUnsafeRegion--;
+ }
+}
+
+#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 JS::GCNurseryCollectionCallback
+JS::SetGCNurseryCollectionCallback(JSContext* cx,
+ GCNurseryCollectionCallback callback) {
+ return cx->runtime()->gc.setNurseryCollectionCallback(callback);
+}
+
+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);
+ double 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");
+}
+
+} /* 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);
+}