C++ WrapperValue类代码示例

js::RemapAllWrappersForObject(JSContext *cx, JSObject *oldTargetArg,
                              JSObject *newTargetArg)
{
    RootedValue origv(cx, ObjectValue(*oldTargetArg));
    RootedObject newTarget(cx, newTargetArg);

    AutoWrapperVector toTransplant(cx);
    if (!toTransplant.reserve(cx->runtime->numCompartments))
        return false;

    for (CompartmentsIter c(cx->runtime); !c.done(); c.next()) {
        if (WrapperMap::Ptr wp = c->lookupWrapper(origv)) {
            // We found a wrapper. Remember and root it.
            toTransplant.infallibleAppend(WrapperValue(wp));
        }
    }

    for (WrapperValue *begin = toTransplant.begin(), *end = toTransplant.end();
         begin != end; ++begin)
    {
        if (!RemapWrapper(cx, &begin->toObject(), newTarget))
            MOZ_CRASH();
    }

    return true;
}

js::RecomputeWrappers(JSContext *cx, const CompartmentFilter &sourceFilter,
                      const CompartmentFilter &targetFilter)
{
    AutoMaybeTouchDeadCompartments agc(cx);

    AutoWrapperVector toRecompute(cx);

    for (CompartmentsIter c(cx->runtime); !c.done(); c.next()) {
        // Filter by source compartment.
        if (!sourceFilter.match(c))
            continue;

        // Iterate over the wrappers, filtering appropriately.
        WrapperMap &pmap = c->crossCompartmentWrappers;
        for (WrapperMap::Enum e(pmap); !e.empty(); e.popFront()) {
            // Filter out non-objects.
            const CrossCompartmentKey &k = e.front().key;
            if (k.kind != CrossCompartmentKey::ObjectWrapper)
                continue;

            // Filter by target compartment.
            if (!targetFilter.match(k.wrapped->compartment()))
                continue;

            // Add it to the list.
            if (!toRecompute.append(WrapperValue(e)))
                return false;
        }
    }

    // Recompute all the wrappers in the list.
    for (WrapperValue *begin = toRecompute.begin(), *end = toRecompute.end(); begin != end; ++begin)
    {
        JSObject *wrapper = &begin->toObject();
        JSObject *wrapped = Wrapper::wrappedObject(wrapper);
        if (!RemapWrapper(cx, wrapper, wrapped))
            MOZ_CRASH();
    }

    return true;
}

//.........这里部分代码省略.........

      case SCRIPTVECTOR: {
        AutoScriptVector::VectorImpl &vector = static_cast<AutoScriptVector *>(this)->vector;
        MarkScriptRootRange(trc, vector.length(), vector.begin(), "js::AutoScriptVector.vector");
        return;
      }

      case OBJOBJHASHMAP: {
        AutoObjectObjectHashMap::HashMapImpl &map = static_cast<AutoObjectObjectHashMap *>(this)->map;
        for (AutoObjectObjectHashMap::Enum e(map); !e.empty(); e.popFront()) {
            MarkObjectRoot(trc, &e.front().value(), "AutoObjectObjectHashMap value");
            JS_SET_TRACING_LOCATION(trc, (void *)&e.front().key());
            JSObject *key = e.front().key();
            MarkObjectRoot(trc, &key, "AutoObjectObjectHashMap key");
            if (key != e.front().key())
                e.rekeyFront(key);
        }
        return;
      }

      case OBJU32HASHMAP: {
        AutoObjectUnsigned32HashMap *self = static_cast<AutoObjectUnsigned32HashMap *>(this);
        AutoObjectUnsigned32HashMap::HashMapImpl &map = self->map;
        for (AutoObjectUnsigned32HashMap::Enum e(map); !e.empty(); e.popFront()) {
            JSObject *key = e.front().key();
            MarkObjectRoot(trc, &key, "AutoObjectUnsignedHashMap key");
            if (key != e.front().key())
                e.rekeyFront(key);
        }
        return;
      }

      case OBJHASHSET: {
        AutoObjectHashSet *self = static_cast<AutoObjectHashSet *>(this);
        AutoObjectHashSet::HashSetImpl &set = self->set;
        for (AutoObjectHashSet::Enum e(set); !e.empty(); e.popFront()) {
            JSObject *obj = e.front();
            MarkObjectRoot(trc, &obj, "AutoObjectHashSet value");
            if (obj != e.front())
                e.rekeyFront(obj);
        }
        return;
      }

      case HASHABLEVALUE: {
        AutoHashableValueRooter *rooter = static_cast<AutoHashableValueRooter *>(this);
        rooter->trace(trc);
        return;
      }

      case IONMASM: {
#ifdef JS_ION
        static_cast<js::jit::MacroAssembler::AutoRooter *>(this)->masm()->trace(trc);
#endif
        return;
      }

      case IONALLOC: {
#ifdef JS_ION
        static_cast<js::jit::AutoTempAllocatorRooter *>(this)->trace(trc);
#endif
        return;
      }

      case WRAPPER: {
        /*
         * We need to use MarkValueUnbarriered here because we mark wrapper
         * roots in every slice. This is because of some rule-breaking in
         * RemapAllWrappersForObject; see comment there.
         */
          MarkValueUnbarriered(trc, &static_cast<AutoWrapperRooter *>(this)->value.get(),
                               "JS::AutoWrapperRooter.value");
        return;
      }

      case WRAPVECTOR: {
        AutoWrapperVector::VectorImpl &vector = static_cast<AutoWrapperVector *>(this)->vector;
        /*
         * We need to use MarkValueUnbarriered here because we mark wrapper
         * roots in every slice. This is because of some rule-breaking in
         * RemapAllWrappersForObject; see comment there.
         */
        for (WrapperValue *p = vector.begin(); p < vector.end(); p++)
            MarkValueUnbarriered(trc, &p->get(), "js::AutoWrapperVector.vector");
        return;
      }

      case JSONPARSER:
        static_cast<js::JSONParser *>(this)->trace(trc);
        return;

      case CUSTOM:
        static_cast<JS::CustomAutoRooter *>(this)->trace(trc);
        return;
    }

    JS_ASSERT(tag_ >= 0);
    if (Value *vp = static_cast<AutoArrayRooter *>(this)->array)
        MarkValueRootRange(trc, tag_, vp, "JS::AutoArrayRooter.array");
}

//.........这里部分代码省略.........
        return;
    }

    case IDVALVECTOR: {
        AutoIdValueVector::VectorImpl& vector = static_cast<AutoIdValueVector*>(this)->vector;
        for (size_t i = 0; i < vector.length(); i++) {
            TraceRoot(trc, &vector[i].id, "js::AutoIdValueVector id");
            TraceRoot(trc, &vector[i].value, "js::AutoIdValueVector value");
        }
        return;
    }

    case SHAPEVECTOR: {
        AutoShapeVector::VectorImpl& vector = static_cast<js::AutoShapeVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), const_cast<Shape**>(vector.begin()),
                       "js::AutoShapeVector.vector");
        return;
    }

    case OBJVECTOR: {
        AutoObjectVector::VectorImpl& vector = static_cast<AutoObjectVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "JS::AutoObjectVector.vector");
        return;
    }

    case STRINGVECTOR: {
        AutoStringVector::VectorImpl& vector = static_cast<AutoStringVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "js::AutoStringVector.vector");
        return;
    }

    case NAMEVECTOR: {
        AutoNameVector::VectorImpl& vector = static_cast<AutoNameVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "js::AutoNameVector.vector");
        return;
    }

    case VALARRAY: {
        /*
         * We don't know the template size parameter, but we can safely treat it
         * as an AutoValueArray<1> because the length is stored separately.
         */
        AutoValueArray<1>* array = static_cast<AutoValueArray<1>*>(this);
        TraceRootRange(trc, array->length(), array->begin(), "js::AutoValueArray");
        return;
    }

    case SCRIPTVECTOR: {
        AutoScriptVector::VectorImpl& vector = static_cast<AutoScriptVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "js::AutoScriptVector.vector");
        return;
    }

    case HASHABLEVALUE: {
        AutoHashableValueRooter* rooter = static_cast<AutoHashableValueRooter*>(this);
        rooter->trace(trc);
        return;
    }

    case IONMASM: {
        static_cast<js::jit::MacroAssembler::AutoRooter*>(this)->masm()->trace(trc);
        return;
    }

    case WRAPPER: {
        /*
         * We need to use TraceManuallyBarrieredEdge here because we mark
         * wrapper roots in every slice. This is because of some rule-breaking
         * in RemapAllWrappersForObject; see comment there.
         */
        TraceManuallyBarrieredEdge(trc, &static_cast<AutoWrapperRooter*>(this)->value.get(),
                                   "JS::AutoWrapperRooter.value");
        return;
    }

    case WRAPVECTOR: {
        AutoWrapperVector::VectorImpl& vector = static_cast<AutoWrapperVector*>(this)->vector;
        /*
         * We need to use TraceManuallyBarrieredEdge here because we mark
         * wrapper roots in every slice. This is because of some rule-breaking
         * in RemapAllWrappersForObject; see comment there.
         */
        for (WrapperValue* p = vector.begin(); p < vector.end(); p++)
            TraceManuallyBarrieredEdge(trc, &p->get(), "js::AutoWrapperVector.vector");
        return;
    }

    case JSONPARSER:
        static_cast<js::JSONParserBase*>(this)->trace(trc);
        return;

    case CUSTOM:
        static_cast<JS::CustomAutoRooter*>(this)->trace(trc);
        return;
    }

    MOZ_ASSERT(tag_ >= 0);
    if (Value* vp = static_cast<AutoArrayRooter*>(this)->array)
        TraceRootRange(trc, tag_, vp, "JS::AutoArrayRooter.array");
}

inline void
AutoGCRooter::trace(JSTracer* trc)
{
    switch (tag_) {
      case PARSER:
        frontend::MarkParser(trc, this);
        return;

      case VALVECTOR: {
        AutoValueVector::VectorImpl& vector = static_cast<AutoValueVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "JS::AutoValueVector.vector");
        return;
      }

      case IDVECTOR: {
        AutoIdVector::VectorImpl& vector = static_cast<AutoIdVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "JS::AutoIdVector.vector");
        return;
      }

      case OBJVECTOR: {
        AutoObjectVector::VectorImpl& vector = static_cast<AutoObjectVector*>(this)->vector;
        TraceRootRange(trc, vector.length(), vector.begin(), "JS::AutoObjectVector.vector");
        return;
      }

      case VALARRAY: {
        /*
         * We don't know the template size parameter, but we can safely treat it
         * as an AutoValueArray<1> because the length is stored separately.
         */
        AutoValueArray<1>* array = static_cast<AutoValueArray<1>*>(this);
        TraceRootRange(trc, array->length(), array->begin(), "js::AutoValueArray");
        return;
      }

      case IONMASM: {
        static_cast<js::jit::MacroAssembler::AutoRooter*>(this)->masm()->trace(trc);
        return;
      }

      case WRAPPER: {
        /*
         * We need to use TraceManuallyBarrieredEdge here because we mark
         * wrapper roots in every slice. This is because of some rule-breaking
         * in RemapAllWrappersForObject; see comment there.
         */
        TraceManuallyBarrieredEdge(trc, &static_cast<AutoWrapperRooter*>(this)->value.get(),
                                   "JS::AutoWrapperRooter.value");
        return;
      }

      case WRAPVECTOR: {
        AutoWrapperVector::VectorImpl& vector = static_cast<AutoWrapperVector*>(this)->vector;
        /*
         * We need to use TraceManuallyBarrieredEdge here because we mark
         * wrapper roots in every slice. This is because of some rule-breaking
         * in RemapAllWrappersForObject; see comment there.
         */
        for (WrapperValue* p = vector.begin(); p < vector.end(); p++)
            TraceManuallyBarrieredEdge(trc, &p->get(), "js::AutoWrapperVector.vector");
        return;
      }

      case CUSTOM:
        static_cast<JS::CustomAutoRooter*>(this)->trace(trc);
        return;
    }

    MOZ_ASSERT(tag_ >= 0);
    if (Value* vp = static_cast<AutoArrayRooter*>(this)->array)
        TraceRootRange(trc, tag_, vp, "JS::AutoArrayRooter.array");
}

//.........这里部分代码省略.........
      case VALARRAY: {
        /*
         * We don't know the template size parameter, but we can safely treat it
         * as an AutoValueArray<1> because the length is stored separately.
         */
        AutoValueArray<1> *array = static_cast<AutoValueArray<1> *>(this);
        MarkValueRootRange(trc, array->length(), array->begin(), "js::AutoValueArray");
        return;
      }

      case SCRIPTVECTOR: {
        AutoScriptVector::VectorImpl &vector = static_cast<AutoScriptVector *>(this)->vector;
        MarkScriptRootRange(trc, vector.length(), vector.begin(), "js::AutoScriptVector.vector");
        return;
      }

      case OBJOBJHASHMAP: {
        AutoObjectObjectHashMap::HashMapImpl &map = static_cast<AutoObjectObjectHashMap *>(this)->map;
        for (AutoObjectObjectHashMap::Enum e(map); !e.empty(); e.popFront()) {
            MarkObjectRoot(trc, &e.front().value(), "AutoObjectObjectHashMap value");
            trc->setTracingLocation((void *)&e.front().key());
            JSObject *key = e.front().key();
            MarkObjectRoot(trc, &key, "AutoObjectObjectHashMap key");
            if (key != e.front().key())
                e.rekeyFront(key);
        }
        return;
      }

      case OBJU32HASHMAP: {
        AutoObjectUnsigned32HashMap *self = static_cast<AutoObjectUnsigned32HashMap *>(this);
        AutoObjectUnsigned32HashMap::HashMapImpl &map = self->map;
        for (AutoObjectUnsigned32HashMap::Enum e(map); !e.empty(); e.popFront()) {
            JSObject *key = e.front().key();
            MarkObjectRoot(trc, &key, "AutoObjectUnsignedHashMap key");
            if (key != e.front().key())
                e.rekeyFront(key);
        }
        return;
      }

      case OBJHASHSET: {
        AutoObjectHashSet *self = static_cast<AutoObjectHashSet *>(this);
        AutoObjectHashSet::HashSetImpl &set = self->set;
        for (AutoObjectHashSet::Enum e(set); !e.empty(); e.popFront()) {
            JSObject *obj = e.front();
            MarkObjectRoot(trc, &obj, "AutoObjectHashSet value");
            if (obj != e.front())
                e.rekeyFront(obj);
        }
        return;
      }

      case HASHABLEVALUE: {
        AutoHashableValueRooter *rooter = static_cast<AutoHashableValueRooter *>(this);
        rooter->trace(trc);
        return;
      }

      case IONMASM: {
        static_cast<js::jit::MacroAssembler::AutoRooter *>(this)->masm()->trace(trc);
        return;
      }

      case WRAPPER: {
        /*
         * We need to use MarkValueUnbarriered here because we mark wrapper
         * roots in every slice. This is because of some rule-breaking in
         * RemapAllWrappersForObject; see comment there.
         */
          MarkValueUnbarriered(trc, &static_cast<AutoWrapperRooter *>(this)->value.get(),
                               "JS::AutoWrapperRooter.value");
        return;
      }

      case WRAPVECTOR: {
        AutoWrapperVector::VectorImpl &vector = static_cast<AutoWrapperVector *>(this)->vector;
        /*
         * We need to use MarkValueUnbarriered here because we mark wrapper
         * roots in every slice. This is because of some rule-breaking in
         * RemapAllWrappersForObject; see comment there.
         */
        for (WrapperValue *p = vector.begin(); p < vector.end(); p++)
            MarkValueUnbarriered(trc, &p->get(), "js::AutoWrapperVector.vector");
        return;
      }

      case JSONPARSER:
        static_cast<js::JSONParserBase *>(this)->trace(trc);
        return;

      case CUSTOM:
        static_cast<JS::CustomAutoRooter *>(this)->trace(trc);
        return;
    }

    MOZ_ASSERT(tag_ >= 0);
    if (Value *vp = static_cast<AutoArrayRooter *>(this)->array)
        MarkValueRootRange(trc, tag_, vp, "JS::AutoArrayRooter.array");
}