The Tor Browser: js/src/jsfriendapi.cpp@b8a032363ba2 (annotated)

js/src/jsfriendapi.cpp@b8a032363ba2 (annotated)

js/src/jsfriendapi.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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 */

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js/src/jsfriendapi.cpp