The Tor Browser / file revision

 /* -*- 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 "jsfriendapi.h"

 #include "mozilla/PodOperations.h"

 #include <stdint.h>

 #include "jscntxt.h"

 #include "jscompartment.h"

 #include "jsgc.h"

 #include "jsobj.h"

 #include "jsproxy.h"

 #include "jswatchpoint.h"

 #include "jsweakmap.h"

 #include "jswrapper.h"

 #include "prmjtime.h"

 #include "builtin/TestingFunctions.h"

 #include "vm/WrapperObject.h"

 #include "jsobjinlines.h"

 #include "vm/ScopeObject-inl.h"

 using namespace js;

 using namespace JS;

 using mozilla::PodArrayZero;

 // Required by PerThreadDataFriendFields::getMainThread()

 JS_STATIC_ASSERT(offsetof(JSRuntime, mainThread) ==

                  PerThreadDataFriendFields::RuntimeMainThreadOffset);

 PerThreadDataFriendFields::PerThreadDataFriendFields()

 {

     PodArrayZero(nativeStackLimit);

 #if JS_STACK_GROWTH_DIRECTION > 0

     for (int i=0; i<StackKindCount; i++)

         nativeStackLimit[i] = UINTPTR_MAX;

 #endif

 #if defined(JSGC_USE_EXACT_ROOTING)

     PodArrayZero(thingGCRooters);

 #endif

 }

 JS_FRIEND_API(void)

 js::SetSourceHook(JSRuntime *rt, SourceHook *hook)

 {

     rt->sourceHook = hook;

 }

 JS_FRIEND_API(SourceHook *)

 js::ForgetSourceHook(JSRuntime *rt)

 {

     return rt->sourceHook.forget();

 }

 JS_FRIEND_API(void)

 JS_SetGrayGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data)

 {

     rt->gcGrayRootTracer.op = traceOp;

     rt->gcGrayRootTracer.data = data;

 }

 JS_FRIEND_API(JSString *)

 JS_GetAnonymousString(JSRuntime *rt)

 {

     JS_ASSERT(rt->hasContexts());

     return rt->commonNames->anonymous;

 }

 JS_FRIEND_API(void)

 JS_SetIsWorkerRuntime(JSRuntime *rt)

 {

     rt->setIsWorkerRuntime();

 }

 JS_FRIEND_API(JSObject *)

 JS_FindCompilationScope(JSContext *cx, HandleObject objArg)

 {

     RootedObject obj(cx, objArg);

     /*

      * We unwrap wrappers here. This is a little weird, but it's what's being

      * asked of us.

      */

     if (obj->is<WrapperObject>())

         obj = UncheckedUnwrap(obj);

     /*

      * Innerize the target_obj so that we compile in the correct (inner)

      * scope.

      */

     if (JSObjectOp op = obj->getClass()->ext.innerObject)

         obj = op(cx, obj);

     return obj;

 }

 JS_FRIEND_API(JSFunction *)

 JS_GetObjectFunction(JSObject *obj)

 {

     if (obj->is<JSFunction>())

         return &obj->as<JSFunction>();

     return nullptr;

 }

 JS_FRIEND_API(bool)

 JS_SplicePrototype(JSContext *cx, HandleObject obj, HandleObject proto)

 {

     /*

      * Change the prototype of an object which hasn't been used anywhere

      * and does not share its type with another object. Unlike JS_SetPrototype,

      * does not nuke type information for the object.

      */

     CHECK_REQUEST(cx);

     if (!obj->hasSingletonType()) {

         /*

          * We can see non-singleton objects when trying to splice prototypes

          * due to mutable __proto__ (ugh).

          */

         return JS_SetPrototype(cx, obj, proto);

     }

     Rooted<TaggedProto> tagged(cx, TaggedProto(proto));

     return obj->splicePrototype(cx, obj->getClass(), tagged);

 }

 JS_FRIEND_API(JSObject *)

 JS_NewObjectWithUniqueType(JSContext *cx, const JSClass *clasp, HandleObject proto,

                            HandleObject parent)

 {

     /*

      * Create our object with a null proto and then splice in the correct proto

      * after we setSingletonType, so that we don't pollute the default

      * TypeObject attached to our proto with information about our object, since

      * we're not going to be using that TypeObject anyway.

      */

     RootedObject obj(cx, NewObjectWithGivenProto(cx, (const js::Class *)clasp, nullptr,

                                                  parent, SingletonObject));

     if (!obj)

         return nullptr;

     if (!JS_SplicePrototype(cx, obj, proto))

         return nullptr;

     return obj;

 }

 JS_FRIEND_API(void)

 JS::PrepareZoneForGC(Zone *zone)

 {

     zone->scheduleGC();

 }

 JS_FRIEND_API(void)

 JS::PrepareForFullGC(JSRuntime *rt)

 {

     for (ZonesIter zone(rt, WithAtoms); !zone.done(); zone.next())

         zone->scheduleGC();

 }

 JS_FRIEND_API(void)

 JS::PrepareForIncrementalGC(JSRuntime *rt)

 {

     if (!JS::IsIncrementalGCInProgress(rt))

         return;

     for (ZonesIter zone(rt, WithAtoms); !zone.done(); zone.next()) {

         if (zone->wasGCStarted())

             PrepareZoneForGC(zone);

     }

 }

 JS_FRIEND_API(bool)

 JS::IsGCScheduled(JSRuntime *rt)

 {

     for (ZonesIter zone(rt, WithAtoms); !zone.done(); zone.next()) {

         if (zone->isGCScheduled())

             return true;

     }

     return false;

 }

 JS_FRIEND_API(void)

 JS::SkipZoneForGC(Zone *zone)

 {

     zone->unscheduleGC();

 }

 JS_FRIEND_API(void)

 JS::GCForReason(JSRuntime *rt, gcreason::Reason reason)

 {

     GC(rt, GC_NORMAL, reason);

 }

 JS_FRIEND_API(void)

 JS::ShrinkingGC(JSRuntime *rt, gcreason::Reason reason)

 {

     GC(rt, GC_SHRINK, reason);

 }

 JS_FRIEND_API(void)

 JS::IncrementalGC(JSRuntime *rt, gcreason::Reason reason, int64_t millis)

 {

     GCSlice(rt, GC_NORMAL, reason, millis);

 }

 JS_FRIEND_API(void)

 JS::FinishIncrementalGC(JSRuntime *rt, gcreason::Reason reason)

 {

     GCFinalSlice(rt, GC_NORMAL, reason);

 }

 JS_FRIEND_API(JSPrincipals *)

 JS_GetCompartmentPrincipals(JSCompartment *compartment)

 {

     return compartment->principals;

 }

 JS_FRIEND_API(void)

 JS_SetCompartmentPrincipals(JSCompartment *compartment, JSPrincipals *principals)

 {

     // Short circuit if there's no change.

     if (principals == compartment->principals)

         return;

     // Any compartment with the trusted principals -- and there can be

     // multiple -- is a system compartment.

     const JSPrincipals *trusted = compartment->runtimeFromMainThread()->trustedPrincipals();

     bool isSystem = principals && principals == trusted;

     // Clear out the old principals, if any.

     if (compartment->principals) {

         JS_DropPrincipals(compartment->runtimeFromMainThread(), compartment->principals);

         compartment->principals = nullptr;

         // We'd like to assert that our new principals is always same-origin

         // with the old one, but JSPrincipals doesn't give us a way to do that.

         // But we can at least assert that we're not switching between system

         // and non-system.

         JS_ASSERT(compartment->isSystem == isSystem);

     }

     // Set up the new principals.

     if (principals) {

         JS_HoldPrincipals(principals);

         compartment->principals = principals;

     }

     // Update the system flag.

     compartment->isSystem = isSystem;

 }

 JS_FRIEND_API(bool)

 JS_WrapPropertyDescriptor(JSContext *cx, JS::MutableHandle<js::PropertyDescriptor> desc)

 {

     return cx->compartment()->wrap(cx, desc);

 }

 JS_FRIEND_API(bool)

 JS_WrapAutoIdVector(JSContext *cx, js::AutoIdVector &props)

 {

     return cx->compartment()->wrap(cx, props);

 }

 JS_FRIEND_API(void)

 JS_TraceShapeCycleCollectorChildren(JSTracer *trc, void *shape)

 {

     MarkCycleCollectorChildren(trc, static_cast<Shape *>(shape));

 }

 static bool

 DefineHelpProperty(JSContext *cx, HandleObject obj, const char *prop, const char *value)

 {

     RootedAtom atom(cx, Atomize(cx, value, strlen(value)));

     if (!atom)

         return false;

     return JS_DefineProperty(cx, obj, prop, atom, JSPROP_READONLY | JSPROP_PERMANENT,

                              JS_PropertyStub, JS_StrictPropertyStub);

 }

 JS_FRIEND_API(bool)

 JS_DefineFunctionsWithHelp(JSContext *cx, HandleObject obj, const JSFunctionSpecWithHelp *fs)

 {

     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, obj);

     for (; fs->name; fs++) {

         JSAtom *atom = Atomize(cx, fs->name, strlen(fs->name));

         if (!atom)

             return false;

         Rooted<jsid> id(cx, AtomToId(atom));

         RootedFunction fun(cx, DefineFunction(cx, obj, id, fs->call, fs->nargs, fs->flags));

         if (!fun)

             return false;

         if (fs->usage) {

             if (!DefineHelpProperty(cx, fun, "usage", fs->usage))

                 return false;

         }

         if (fs->help) {

             if (!DefineHelpProperty(cx, fun, "help", fs->help))

                 return false;

         }

     }

     return true;

 }

 JS_FRIEND_API(bool)

 js_ObjectClassIs(JSContext *cx, HandleObject obj, ESClassValue classValue)

 {

     return ObjectClassIs(obj, classValue, cx);

 }

 JS_FRIEND_API(const char *)

 js_ObjectClassName(JSContext *cx, HandleObject obj)

 {

     return JSObject::className(cx, obj);

 }

 JS_FRIEND_API(JS::Zone *)

 js::GetCompartmentZone(JSCompartment *comp)

 {

     return comp->zone();

 }

 JS_FRIEND_API(bool)

 js::IsSystemCompartment(JSCompartment *comp)

 {

     return comp->isSystem;

 }

 JS_FRIEND_API(bool)

 js::IsSystemZone(Zone *zone)

 {

     return zone->isSystem;

 }

 JS_FRIEND_API(bool)

 js::IsAtomsCompartment(JSCompartment *comp)

 {

     return comp->runtimeFromAnyThread()->isAtomsCompartment(comp);

 }

 JS_FRIEND_API(bool)

 js::IsInNonStrictPropertySet(JSContext *cx)

 {

     jsbytecode *pc;

     JSScript *script = cx->currentScript(&pc, JSContext::ALLOW_CROSS_COMPARTMENT);

     return script && !script->strict() && (js_CodeSpec[*pc].format & JOF_SET);

 }

 JS_FRIEND_API(bool)

 js::IsFunctionObject(JSObject *obj)

 {

     return obj->is<JSFunction>();

 }

 JS_FRIEND_API(bool)

 js::IsScopeObject(JSObject *obj)

 {

     return obj->is<ScopeObject>();

 }

 JS_FRIEND_API(bool)

 js::IsCallObject(JSObject *obj)

 {

     return obj->is<CallObject>();

 }

 JS_FRIEND_API(JSObject *)

 js::GetObjectParentMaybeScope(JSObject *obj)

 {

     return obj->enclosingScope();

 }

 JS_FRIEND_API(JSObject *)

 js::GetGlobalForObjectCrossCompartment(JSObject *obj)

 {

     return &obj->global();

 }

 JS_FRIEND_API(void)

 js::SetPendingExceptionCrossContext(JSContext *cx, JS::HandleValue v)

 {

     cx->setPendingException(v);

 }

 JS_FRIEND_API(void)

 js::AssertSameCompartment(JSContext *cx, JSObject *obj)

 {

     assertSameCompartment(cx, obj);

 }

 #ifdef DEBUG

 JS_FRIEND_API(void)

 js::AssertSameCompartment(JSObject *objA, JSObject *objB)

 {

     JS_ASSERT(objA->compartment() == objB->compartment());

 }

 #endif

 JS_FRIEND_API(JSObject *)

 js::DefaultObjectForContextOrNull(JSContext *cx)

 {

     if (cx->options().noDefaultCompartmentObject())

         return nullptr;

     return cx->maybeDefaultCompartmentObject();

 }

 JS_FRIEND_API(void)

 js::SetDefaultObjectForContext(JSContext *cx, JSObject *obj)

 {

     cx->setDefaultCompartmentObject(obj);

 }

 JS_FRIEND_API(void)

 js::NotifyAnimationActivity(JSObject *obj)

 {

     obj->compartment()->lastAnimationTime = PRMJ_Now();

 }

 JS_FRIEND_API(uint32_t)

 js::GetObjectSlotSpan(JSObject *obj)

 {

     return obj->slotSpan();

 }

 JS_FRIEND_API(bool)

 js::IsObjectInContextCompartment(JSObject *obj, const JSContext *cx)

 {

     return obj->compartment() == cx->compartment();

 }

 JS_FRIEND_API(bool)

 js::RunningWithTrustedPrincipals(JSContext *cx)

 {

     return cx->runningWithTrustedPrincipals();

 }

 JS_FRIEND_API(JSScript *)

 js::GetOutermostEnclosingFunctionOfScriptedCaller(JSContext *cx)

 {

     ScriptFrameIter iter(cx);

     if (iter.done())

         return nullptr;

     if (!iter.isFunctionFrame())

         return nullptr;

     RootedFunction scriptedCaller(cx, iter.callee());

     RootedScript outermost(cx, scriptedCaller->nonLazyScript());

     for (StaticScopeIter<NoGC> i(scriptedCaller); !i.done(); i++) {

         if (i.type() == StaticScopeIter<NoGC>::FUNCTION)

             outermost = i.funScript();

     }

     return outermost;

 }

 JS_FRIEND_API(JSFunction *)

 js::DefineFunctionWithReserved(JSContext *cx, JSObject *objArg, const char *name, JSNative call,

                                unsigned nargs, unsigned attrs)

 {

     RootedObject obj(cx, objArg);

     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, obj);

     JSAtom *atom = Atomize(cx, name, strlen(name));

     if (!atom)

         return nullptr;

     Rooted<jsid> id(cx, AtomToId(atom));

     return DefineFunction(cx, obj, id, call, nargs, attrs, JSFunction::ExtendedFinalizeKind);

 }

 JS_FRIEND_API(JSFunction *)

 js::NewFunctionWithReserved(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,

                             JSObject *parentArg, const char *name)

 {

     RootedObject parent(cx, parentArg);

     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, parent);

     RootedAtom atom(cx);

     if (name) {

         atom = Atomize(cx, name, strlen(name));

         if (!atom)

             return nullptr;

     }

     JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);

     return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, atom,

                        JSFunction::ExtendedFinalizeKind);

 }

 JS_FRIEND_API(JSFunction *)

 js::NewFunctionByIdWithReserved(JSContext *cx, JSNative native, unsigned nargs, unsigned flags, JSObject *parentArg,

                                 jsid id)

 {

     RootedObject parent(cx, parentArg);

     JS_ASSERT(JSID_IS_STRING(id));

     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, parent);

     RootedAtom atom(cx, JSID_TO_ATOM(id));

     JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);

     return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, atom,

                        JSFunction::ExtendedFinalizeKind);

 }

 JS_FRIEND_API(JSObject *)

 js::InitClassWithReserved(JSContext *cx, JSObject *objArg, JSObject *parent_protoArg,

                           const JSClass *clasp, JSNative constructor, unsigned nargs,

                           const JSPropertySpec *ps, const JSFunctionSpec *fs,

                           const JSPropertySpec *static_ps, const JSFunctionSpec *static_fs)

 {

     RootedObject obj(cx, objArg);

     RootedObject parent_proto(cx, parent_protoArg);

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, obj, parent_proto);

     return js_InitClass(cx, obj, parent_proto, Valueify(clasp), constructor,

                         nargs, ps, fs, static_ps, static_fs, nullptr,

                         JSFunction::ExtendedFinalizeKind);

 }

 JS_FRIEND_API(const Value &)

 js::GetFunctionNativeReserved(JSObject *fun, size_t which)

 {

     JS_ASSERT(fun->as<JSFunction>().isNative());

     return fun->as<JSFunction>().getExtendedSlot(which);

 }

 JS_FRIEND_API(void)

 js::SetFunctionNativeReserved(JSObject *fun, size_t which, const Value &val)

 {

     JS_ASSERT(fun->as<JSFunction>().isNative());

     MOZ_ASSERT_IF(val.isObject(), val.toObject().compartment() == fun->compartment());

     fun->as<JSFunction>().setExtendedSlot(which, val);

 }

 JS_FRIEND_API(bool)

 js::GetObjectProto(JSContext *cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JSObject*> proto)

 {

     if (IsProxy(obj))

         return JS_GetPrototype(cx, obj, proto);

     proto.set(reinterpret_cast<const shadow::Object*>(obj.get())->type->proto);

     return true;

 }

 JS_FRIEND_API(bool)

 js::GetOriginalEval(JSContext *cx, HandleObject scope, MutableHandleObject eval)

 {

     assertSameCompartment(cx, scope);

     Rooted<GlobalObject *> global(cx, &scope->global());

     return GlobalObject::getOrCreateEval(cx, global, eval);

 }

 JS_FRIEND_API(void)

 js::SetReservedSlotWithBarrier(JSObject *obj, size_t slot, const js::Value &value)

 {

     obj->setSlot(slot, value);

 }

 JS_FRIEND_API(bool)

 js::GetGeneric(JSContext *cx, JSObject *objArg, JSObject *receiverArg, jsid idArg,

                Value *vp)

 {

     RootedObject obj(cx, objArg), receiver(cx, receiverArg);

     RootedId id(cx, idArg);

     RootedValue value(cx);

     if (!JSObject::getGeneric(cx, obj, receiver, id, &value))

         return false;

     *vp = value;

     return true;

 }

 void

 js::SetPreserveWrapperCallback(JSRuntime *rt, PreserveWrapperCallback callback)

 {

     rt->preserveWrapperCallback = callback;

 }

 /*

  * The below code is for temporary telemetry use. It can be removed when

  * sufficient data has been harvested.

  */

 namespace js {

 // Defined in vm/GlobalObject.cpp.

 extern size_t sSetProtoCalled;

 }

 JS_FRIEND_API(size_t)

 JS_SetProtoCalled(JSContext *)

 {

     return sSetProtoCalled;

 }

 // Defined in jsiter.cpp.

 extern size_t sCustomIteratorCount;

 JS_FRIEND_API(size_t)

 JS_GetCustomIteratorCount(JSContext *cx)

 {

     return sCustomIteratorCount;

 }

 JS_FRIEND_API(bool)

 JS_IsDeadWrapper(JSObject *obj)

 {

     if (!obj->is<ProxyObject>()) {

         return false;

     }

     return obj->as<ProxyObject>().handler()->family() == &DeadObjectProxy::sDeadObjectFamily;

 }

 void

 js::TraceWeakMaps(WeakMapTracer *trc)

 {

     WeakMapBase::traceAllMappings(trc);

     WatchpointMap::traceAll(trc);

 }

 extern JS_FRIEND_API(bool)

 js::AreGCGrayBitsValid(JSRuntime *rt)

 {

     return rt->gcGrayBitsValid;

 }

 JS_FRIEND_API(bool)

 js::ZoneGlobalsAreAllGray(JS::Zone *zone)

 {

     for (CompartmentsInZoneIter comp(zone); !comp.done(); comp.next()) {

         JSObject *obj = comp->maybeGlobal();

         if (!obj || !JS::GCThingIsMarkedGray(obj))

             return false;

     }

     return true;

 }

 JS_FRIEND_API(JSGCTraceKind)

 js::GCThingTraceKind(void *thing)

 {

     JS_ASSERT(thing);

     return gc::GetGCThingTraceKind(thing);

 }

 JS_FRIEND_API(void)

 js::VisitGrayWrapperTargets(Zone *zone, GCThingCallback callback, void *closure)

 {

     JSRuntime *rt = zone->runtimeFromMainThread();

     for (CompartmentsInZoneIter comp(zone); !comp.done(); comp.next()) {

         for (JSCompartment::WrapperEnum e(comp); !e.empty(); e.popFront()) {

             gc::Cell *thing = e.front().key().wrapped;

             if (!IsInsideNursery(rt, thing) && thing->isMarked(gc::GRAY))

                 callback(closure, thing);

         }

     }

 }

 JS_FRIEND_API(JSObject *)

 js::GetWeakmapKeyDelegate(JSObject *key)

 {

     if (JSWeakmapKeyDelegateOp op = key->getClass()->ext.weakmapKeyDelegateOp)

         return op(key);

     return nullptr;

 }

 JS_FRIEND_API(void)

 JS_SetAccumulateTelemetryCallback(JSRuntime *rt, JSAccumulateTelemetryDataCallback callback)

 {

     rt->telemetryCallback = callback;

 }

 JS_FRIEND_API(JSObject *)

 JS_CloneObject(JSContext *cx, HandleObject obj, HandleObject protoArg, HandleObject parent)

 {

     Rooted<js::TaggedProto> proto(cx, protoArg.get());

     return CloneObject(cx, obj, proto, parent);

 }

 #ifdef DEBUG

 JS_FRIEND_API(void)

 js_DumpString(JSString *str)

 {

     str->dump();

 }

 JS_FRIEND_API(void)

 js_DumpAtom(JSAtom *atom)

 {

     atom->dump();

 }

 JS_FRIEND_API(void)

 js_DumpChars(const jschar *s, size_t n)

 {

     fprintf(stderr, "jschar * (%p) = ", (void *) s);

     JSString::dumpChars(s, n);

     fputc('\n', stderr);

 }

 JS_FRIEND_API(void)

 js_DumpObject(JSObject *obj)

 {

     if (!obj) {

         fprintf(stderr, "NULL\n");

         return;

     }

     obj->dump();

 }

 #endif

 struct DumpHeapTracer : public JSTracer

 {

     FILE   *output;

     DumpHeapTracer(FILE *fp, JSRuntime *rt, JSTraceCallback callback,

                    WeakMapTraceKind weakTraceKind)

       : JSTracer(rt, callback, weakTraceKind), output(fp)

     {}

 };

 static char

 MarkDescriptor(void *thing)

 {

     gc::Cell *cell = static_cast<gc::Cell*>(thing);

     if (cell->isMarked(gc::BLACK))

         return cell->isMarked(gc::GRAY) ? 'G' : 'B';

     else

         return cell->isMarked(gc::GRAY) ? 'X' : 'W';

 }

 static void

 DumpHeapVisitZone(JSRuntime *rt, void *data, Zone *zone)

 {

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(data);

     fprintf(dtrc->output, "# zone %p\n", (void *)zone);

 }

 static void

 DumpHeapVisitCompartment(JSRuntime *rt, void *data, JSCompartment *comp)

 {

     char name[1024];

     if (rt->compartmentNameCallback)

         (*rt->compartmentNameCallback)(rt, comp, name, sizeof(name));

     else

         strcpy(name, "<unknown>");

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(data);

     fprintf(dtrc->output, "# compartment %s [in zone %p]\n", name, (void *)comp->zone());

 }

 static void

 DumpHeapVisitArena(JSRuntime *rt, void *data, gc::Arena *arena,

                    JSGCTraceKind traceKind, size_t thingSize)

 {

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(data);

     fprintf(dtrc->output, "# arena allockind=%u size=%u\n",

             unsigned(arena->aheader.getAllocKind()), unsigned(thingSize));

 }

 static void

 DumpHeapVisitCell(JSRuntime *rt, void *data, void *thing,

                   JSGCTraceKind traceKind, size_t thingSize)

 {

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(data);

     char cellDesc[1024 * 32];

     JS_GetTraceThingInfo(cellDesc, sizeof(cellDesc), dtrc, thing, traceKind, true);

     fprintf(dtrc->output, "%p %c %s\n", thing, MarkDescriptor(thing), cellDesc);

     JS_TraceChildren(dtrc, thing, traceKind);

 }

 static void

 DumpHeapVisitChild(JSTracer *trc, void **thingp, JSGCTraceKind kind)

 {

     if (gc::IsInsideNursery(trc->runtime(), *thingp))

         return;

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(trc);

     char buffer[1024];

     fprintf(dtrc->output, "> %p %c %s\n", *thingp, MarkDescriptor(*thingp),

             dtrc->getTracingEdgeName(buffer, sizeof(buffer)));

 }

 static void

 DumpHeapVisitRoot(JSTracer *trc, void **thingp, JSGCTraceKind kind)

 {

     if (gc::IsInsideNursery(trc->runtime(), *thingp))

         return;

     DumpHeapTracer *dtrc = static_cast<DumpHeapTracer *>(trc);

     char buffer[1024];

     fprintf(dtrc->output, "%p %c %s\n", *thingp, MarkDescriptor(*thingp),

             dtrc->getTracingEdgeName(buffer, sizeof(buffer)));

 }

 void

 js::DumpHeapComplete(JSRuntime *rt, FILE *fp, js::DumpHeapNurseryBehaviour nurseryBehaviour)

 {

 #ifdef JSGC_GENERATIONAL

     if (nurseryBehaviour == js::CollectNurseryBeforeDump)

         MinorGC(rt, JS::gcreason::API);

 #endif

     DumpHeapTracer dtrc(fp, rt, DumpHeapVisitRoot, TraceWeakMapKeysValues);

     TraceRuntime(&dtrc);

     fprintf(dtrc.output, "==========\n");

     dtrc.setTraceCallback(DumpHeapVisitChild);

     IterateZonesCompartmentsArenasCells(rt, &dtrc,

                                         DumpHeapVisitZone,

                                         DumpHeapVisitCompartment,

                                         DumpHeapVisitArena,

                                         DumpHeapVisitCell);

     fflush(dtrc.output);

 }

 JS_FRIEND_API(const JSStructuredCloneCallbacks *)

 js::GetContextStructuredCloneCallbacks(JSContext *cx)

 {

     return cx->runtime()->structuredCloneCallbacks;

 }

 #ifdef JS_THREADSAFE

 JS_FRIEND_API(bool)

 js::ContextHasOutstandingRequests(const JSContext *cx)

 {

     return cx->outstandingRequests > 0;

 }

 #endif

 JS_FRIEND_API(void)

 js::SetActivityCallback(JSRuntime *rt, ActivityCallback cb, void *arg)

 {

     rt->activityCallback = cb;

     rt->activityCallbackArg = arg;

 }

 JS_FRIEND_API(bool)

 js::IsContextRunningJS(JSContext *cx)

 {

     return cx->currentlyRunning();

 }

 JS_FRIEND_API(JS::GCSliceCallback)

 JS::SetGCSliceCallback(JSRuntime *rt, GCSliceCallback callback)

 {

     JS::GCSliceCallback old = rt->gcSliceCallback;

     rt->gcSliceCallback = callback;

     return old;

 }

 JS_FRIEND_API(bool)

 JS::WasIncrementalGC(JSRuntime *rt)

 {

     return rt->gcIsIncremental;

 }

 jschar *

 GCDescription::formatMessage(JSRuntime *rt) const

 {

     return rt->gcStats.formatMessage();

 }

 jschar *

 GCDescription::formatJSON(JSRuntime *rt, uint64_t timestamp) const

 {

     return rt->gcStats.formatJSON(timestamp);

 }

 JS_FRIEND_API(void)

 JS::NotifyDidPaint(JSRuntime *rt)

 {

     if (rt->gcZeal() == gc::ZealFrameVerifierPreValue) {

         gc::VerifyBarriers(rt, gc::PreBarrierVerifier);

         return;

     }

     if (rt->gcZeal() == gc::ZealFrameVerifierPostValue) {

         gc::VerifyBarriers(rt, gc::PostBarrierVerifier);

         return;

     }

     if (rt->gcZeal() == gc::ZealFrameGCValue) {

         PrepareForFullGC(rt);

         GCSlice(rt, GC_NORMAL, gcreason::REFRESH_FRAME);

         return;

     }

     if (JS::IsIncrementalGCInProgress(rt) && !rt->gcInterFrameGC) {

         JS::PrepareForIncrementalGC(rt);

         GCSlice(rt, GC_NORMAL, gcreason::REFRESH_FRAME);

     }

     rt->gcInterFrameGC = false;

 }

 JS_FRIEND_API(bool)

 JS::IsIncrementalGCEnabled(JSRuntime *rt)

 {

     return rt->gcIncrementalEnabled && rt->gcMode() == JSGC_MODE_INCREMENTAL;

 }

 JS_FRIEND_API(bool)

 JS::IsIncrementalGCInProgress(JSRuntime *rt)

 {

     return rt->gcIncrementalState != gc::NO_INCREMENTAL && !rt->gcVerifyPreData;

 }

 JS_FRIEND_API(void)

 JS::DisableIncrementalGC(JSRuntime *rt)

 {

     rt->gcIncrementalEnabled = false;

 }

 JS::AutoDisableGenerationalGC::AutoDisableGenerationalGC(JSRuntime *rt)

   : runtime(rt)

 #if defined(JSGC_GENERATIONAL) && defined(JS_GC_ZEAL)

   , restartVerifier(rt->gcVerifyPostData)

 #endif

 {

 #ifdef JSGC_GENERATIONAL

     if (IsGenerationalGCEnabled(rt)) {

 #ifdef JS_GC_ZEAL

         if (restartVerifier)

             gc::EndVerifyPostBarriers(rt);

 #endif

         MinorGC(rt, JS::gcreason::API);

         rt->gcNursery.disable();

         rt->gcStoreBuffer.disable();

     }

 #endif

     ++rt->gcGenerationalDisabled;

 }

 JS::AutoDisableGenerationalGC::~AutoDisableGenerationalGC()

 {

     JS_ASSERT(runtime->gcGenerationalDisabled > 0);

     --runtime->gcGenerationalDisabled;

 #ifdef JSGC_GENERATIONAL

     if (runtime->gcGenerationalDisabled == 0) {

         runtime->gcNursery.enable();

         runtime->gcStoreBuffer.enable();

 #ifdef JS_GC_ZEAL

         if (restartVerifier)

             gc::StartVerifyPostBarriers(runtime);

 #endif

     }

 #endif

 }

 extern JS_FRIEND_API(bool)

 JS::IsGenerationalGCEnabled(JSRuntime *rt)

 {

     return rt->gcGenerationalDisabled == 0;

 }

 JS_FRIEND_API(bool)

 JS::IsIncrementalBarrierNeeded(JSRuntime *rt)

 {

     return rt->gcIncrementalState == gc::MARK && !rt->isHeapBusy();

 }

 JS_FRIEND_API(bool)

 JS::IsIncrementalBarrierNeeded(JSContext *cx)

 {

     return IsIncrementalBarrierNeeded(cx->runtime());

 }

 JS_FRIEND_API(void)

 JS::IncrementalObjectBarrier(JSObject *obj)

 {

     if (!obj)

         return;

     JS_ASSERT(!obj->zone()->runtimeFromMainThread()->isHeapMajorCollecting());

     AutoMarkInDeadZone amn(obj->zone());

     JSObject::writeBarrierPre(obj);

 }

 JS_FRIEND_API(void)

 JS::IncrementalReferenceBarrier(void *ptr, JSGCTraceKind kind)

 {

     if (!ptr)

         return;

     if (kind == JSTRACE_STRING && StringIsPermanentAtom(static_cast<JSString *>(ptr)))

         return;

     gc::Cell *cell = static_cast<gc::Cell *>(ptr);

     Zone *zone = kind == JSTRACE_OBJECT

                  ? static_cast<JSObject *>(cell)->zone()

                  : cell->tenuredZone();

     JS_ASSERT(!zone->runtimeFromMainThread()->isHeapMajorCollecting());

     AutoMarkInDeadZone amn(zone);

     if (kind == JSTRACE_OBJECT)

         JSObject::writeBarrierPre(static_cast<JSObject*>(cell));

     else if (kind == JSTRACE_STRING)

         JSString::writeBarrierPre(static_cast<JSString*>(cell));

     else if (kind == JSTRACE_SCRIPT)

         JSScript::writeBarrierPre(static_cast<JSScript*>(cell));

     else if (kind == JSTRACE_LAZY_SCRIPT)

         LazyScript::writeBarrierPre(static_cast<LazyScript*>(cell));

     else if (kind == JSTRACE_SHAPE)

         Shape::writeBarrierPre(static_cast<Shape*>(cell));

     else if (kind == JSTRACE_BASE_SHAPE)

         BaseShape::writeBarrierPre(static_cast<BaseShape*>(cell));

     else if (kind == JSTRACE_TYPE_OBJECT)

         types::TypeObject::writeBarrierPre((types::TypeObject *) ptr);

     else

         MOZ_ASSUME_UNREACHABLE("invalid trace kind");

 }

 JS_FRIEND_API(void)

 JS::IncrementalValueBarrier(const Value &v)

 {

     js::HeapValue::writeBarrierPre(v);

 }

 JS_FRIEND_API(void)

 JS::PokeGC(JSRuntime *rt)

 {

     rt->gcPoke = true;

 }

 JS_FRIEND_API(JSCompartment *)

 js::GetAnyCompartmentInZone(JS::Zone *zone)

 {

     CompartmentsInZoneIter comp(zone);

     JS_ASSERT(!comp.done());

     return comp.get();

 }

 bool

 JS::ObjectPtr::isAboutToBeFinalized()

 {

     return JS_IsAboutToBeFinalized(&value);

 }

 void

 JS::ObjectPtr::trace(JSTracer *trc, const char *name)

 {

     JS_CallHeapObjectTracer(trc, &value, name);

 }

 JS_FRIEND_API(JSObject *)

 js::GetTestingFunctions(JSContext *cx)

 {

     RootedObject obj(cx, JS_NewObject(cx, nullptr, NullPtr(), NullPtr()));

     if (!obj)

         return nullptr;

     if (!DefineTestingFunctions(cx, obj, false))

         return nullptr;

     return obj;

 }

 #ifdef DEBUG

 JS_FRIEND_API(unsigned)

 js::GetEnterCompartmentDepth(JSContext *cx)

 {

   return cx->getEnterCompartmentDepth();

 }

 #endif

 JS_FRIEND_API(void)

 js::SetDOMCallbacks(JSRuntime *rt, const DOMCallbacks *callbacks)

 {

     rt->DOMcallbacks = callbacks;

 }

 JS_FRIEND_API(const DOMCallbacks *)

 js::GetDOMCallbacks(JSRuntime *rt)

 {

     return rt->DOMcallbacks;

 }

 static const void *gDOMProxyHandlerFamily = nullptr;

 static uint32_t gDOMProxyExpandoSlot = 0;

 static DOMProxyShadowsCheck gDOMProxyShadowsCheck;

 JS_FRIEND_API(void)

 js::SetDOMProxyInformation(const void *domProxyHandlerFamily, uint32_t domProxyExpandoSlot,

                            DOMProxyShadowsCheck domProxyShadowsCheck)

 {

     gDOMProxyHandlerFamily = domProxyHandlerFamily;

     gDOMProxyExpandoSlot = domProxyExpandoSlot;

     gDOMProxyShadowsCheck = domProxyShadowsCheck;

 }

 const void *

 js::GetDOMProxyHandlerFamily()

 {

     return gDOMProxyHandlerFamily;

 }

 uint32_t

 js::GetDOMProxyExpandoSlot()

 {

     return gDOMProxyExpandoSlot;

 }

 DOMProxyShadowsCheck

 js::GetDOMProxyShadowsCheck()

 {

     return gDOMProxyShadowsCheck;

 }

 bool

 js::detail::IdMatchesAtom(jsid id, JSAtom *atom)

 {

     return id == INTERNED_STRING_TO_JSID(nullptr, atom);

 }

 JS_FRIEND_API(JSContext *)

 js::DefaultJSContext(JSRuntime *rt)

 {

     if (rt->defaultJSContextCallback) {

         JSContext *cx = rt->defaultJSContextCallback(rt);

         JS_ASSERT(cx);

         return cx;

     }

     JS_ASSERT(rt->contextList.getFirst() == rt->contextList.getLast());

     return rt->contextList.getFirst();

 }

 JS_FRIEND_API(void)

 js::SetDefaultJSContextCallback(JSRuntime *rt, DefaultJSContextCallback cb)

 {

     rt->defaultJSContextCallback = cb;

 }

 #ifdef DEBUG

 JS_FRIEND_API(void)

 js::Debug_SetActiveJSContext(JSRuntime *rt, JSContext *cx)

 {

     rt->activeContext = cx;

 }

 #endif

 JS_FRIEND_API(void)

 js::SetCTypesActivityCallback(JSRuntime *rt, CTypesActivityCallback cb)

 {

     rt->ctypesActivityCallback = cb;

 }

 js::AutoCTypesActivityCallback::AutoCTypesActivityCallback(JSContext *cx,

                                                            js::CTypesActivityType beginType,

                                                            js::CTypesActivityType endType

                                                            MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)

   : cx(cx), callback(cx->runtime()->ctypesActivityCallback), endType(endType)

 {

     MOZ_GUARD_OBJECT_NOTIFIER_INIT;

     if (callback)

         callback(cx, beginType);

 }

 JS_FRIEND_API(void)

 js::SetObjectMetadataCallback(JSContext *cx, ObjectMetadataCallback callback)

 {

     cx->compartment()->setObjectMetadataCallback(callback);

 }

 JS_FRIEND_API(bool)

 js::SetObjectMetadata(JSContext *cx, HandleObject obj, HandleObject metadata)

 {

     return JSObject::setMetadata(cx, obj, metadata);

 }

 JS_FRIEND_API(JSObject *)

 js::GetObjectMetadata(JSObject *obj)

 {

     return obj->getMetadata();

 }

 JS_FRIEND_API(void)

 js::UnsafeDefineElement(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleValue value)

 {

     JS_ASSERT(obj->isNative());

     JS_ASSERT(index < obj->getDenseInitializedLength());

     obj->setDenseElementWithType(cx, index, value);

 }

 JS_FRIEND_API(bool)

 js_DefineOwnProperty(JSContext *cx, JSObject *objArg, jsid idArg,

                      JS::Handle<js::PropertyDescriptor> descriptor, bool *bp)

 {

     RootedObject obj(cx, objArg);

     RootedId id(cx, idArg);

     JS_ASSERT(cx->runtime()->heapState == js::Idle);

     CHECK_REQUEST(cx);

     assertSameCompartment(cx, obj, id, descriptor.value());

     if (descriptor.hasGetterObject())

         assertSameCompartment(cx, descriptor.getterObject());

     if (descriptor.hasSetterObject())

         assertSameCompartment(cx, descriptor.setterObject());

     return DefineOwnProperty(cx, HandleObject(obj), id, descriptor, bp);

 }

 JS_FRIEND_API(bool)

 js_ReportIsNotFunction(JSContext *cx, JS::HandleValue v)

 {

     return ReportIsNotFunction(cx, v);

 }

 #ifdef DEBUG

 JS_PUBLIC_API(bool)

 js::IsInRequest(JSContext *cx)

 {

 #ifdef JS_THREADSAFE

     return !!cx->runtime()->requestDepth;

 #else

     return true;

 #endif

 }

 #endif

 #ifdef JSGC_GENERATIONAL

 JS_FRIEND_API(void)

 JS_StoreObjectPostBarrierCallback(JSContext* cx,

                                   void (*callback)(JSTracer *trc, JSObject *key, void *data),

                                   JSObject *key, void *data)

 {

     JSRuntime *rt = cx->runtime();

     if (IsInsideNursery(rt, key))

         rt->gcStoreBuffer.putCallback(callback, key, data);

 }

 extern JS_FRIEND_API(void)

 JS_StoreStringPostBarrierCallback(JSContext* cx,

                                   void (*callback)(JSTracer *trc, JSString *key, void *data),

                                   JSString *key, void *data)

 {

     JSRuntime *rt = cx->runtime();

     if (IsInsideNursery(rt, key))

         rt->gcStoreBuffer.putCallback(callback, key, data);

 }

 #endif /* JSGC_GENERATIONAL */