C++ JSContext::compartment方法代码示例

bool
BaselineFrame::initForOsr(InterpreterFrame *fp, uint32_t numStackValues)
{
    mozilla::PodZero(this);

    scopeChain_ = fp->scopeChain();

    if (fp->hasCallObjUnchecked())
        flags_ |= BaselineFrame::HAS_CALL_OBJ;

    if (fp->isEvalFrame()) {
        flags_ |= BaselineFrame::EVAL;
        evalScript_ = fp->script();
    }

    if (fp->script()->needsArgsObj() && fp->hasArgsObj()) {
        flags_ |= BaselineFrame::HAS_ARGS_OBJ;
        argsObj_ = &fp->argsObj();
    }

    if (fp->hasHookData()) {
        flags_ |= BaselineFrame::HAS_HOOK_DATA;
        hookData_ = fp->hookData();
    }

    if (fp->hasReturnValue())
        setReturnValue(fp->returnValue());

    if (fp->hasPushedSPSFrame())
        flags_ |= BaselineFrame::HAS_PUSHED_SPS_FRAME;

    frameSize_ = BaselineFrame::FramePointerOffset +
        BaselineFrame::Size() +
        numStackValues * sizeof(Value);

    JS_ASSERT(numValueSlots() == numStackValues);

    for (uint32_t i = 0; i < numStackValues; i++)
        *valueSlot(i) = fp->slots()[i];

    JSContext *cx = GetJSContextFromJitCode();
    if (cx->compartment()->debugMode()) {
        // In debug mode, update any Debugger.Frame objects for the
        // InterpreterFrame to point to the BaselineFrame.

        // The caller pushed a fake return address. ScriptFrameIter, used by the
        // debugger, wants a valid return address, but it's okay to just pick one.
        // In debug mode there's always at least 1 ICEntry (since there are always
        // debug prologue/epilogue calls).
        IonFrameIterator iter(cx);
        JS_ASSERT(iter.returnAddress() == nullptr);
        BaselineScript *baseline = fp->script()->baselineScript();
        iter.current()->setReturnAddress(baseline->returnAddressForIC(baseline->icEntry(0)));

        if (!Debugger::handleBaselineOsr(cx, fp, this))
            return false;
    }

    return true;
}

ErrorCopier::~ErrorCopier()
{
    JSContext* cx = ac->context()->asJSContext();
    if (ac->origin() != cx->compartment() && cx->isExceptionPending()) {
        RootedValue exc(cx);
        if (cx->getPendingException(&exc) && exc.isObject() && exc.toObject().is<ErrorObject>()) {
            cx->clearPendingException();
            ac.reset();
            Rooted<ErrorObject*> errObj(cx, &exc.toObject().as<ErrorObject>());
            JSObject* copyobj = CopyErrorObject(cx, errObj);
            if (copyobj)
                cx->setPendingException(ObjectValue(*copyobj));
        }
    }
}

ErrorCopier::~ErrorCopier()
{
    JSContext *cx = ac.ref().context()->asJSContext();
    if (ac.ref().origin() != cx->compartment() && cx->isExceptionPending()) {
        RootedValue exc(cx, cx->getPendingException());
        if (exc.isObject() && exc.toObject().is<ErrorObject>() &&
            exc.toObject().as<ErrorObject>().getExnPrivate())
        {
            cx->clearPendingException();
            ac.destroy();
            Rooted<JSObject*> errObj(cx, &exc.toObject());
            JSObject *copyobj = js_CopyErrorObject(cx, errObj, scope);
            if (copyobj)
                cx->setPendingException(ObjectValue(*copyobj));
        }
    }
}

ErrorCopier::~ErrorCopier()
{
    JSContext* cx = ac->context();

    // The provenance of Debugger.DebuggeeWouldRun is the topmost locking
    // debugger compartment; it should not be copied around.
    if (ac->origin() != cx->compartment() &&
        cx->isExceptionPending() &&
        !cx->isThrowingDebuggeeWouldRun())
    {
        RootedValue exc(cx);
        if (cx->getPendingException(&exc) && exc.isObject() && exc.toObject().is<ErrorObject>()) {
            cx->clearPendingException();
            ac.reset();
            Rooted<ErrorObject*> errObj(cx, &exc.toObject().as<ErrorObject>());
            JSObject* copyobj = CopyErrorObject(cx, errObj);
            if (copyobj)
                cx->setPendingException(ObjectValue(*copyobj));
        }
    }
}

JSScript*
GlobalHelperThreadState::finishParseTask(JSContext* maybecx, JSRuntime* rt, void* token)
{
    ScopedJSDeletePtr<ParseTask> parseTask;

    // The token is a ParseTask* which should be in the finished list.
    // Find and remove its entry.
    {
        AutoLockHelperThreadState lock;
        ParseTaskVector& finished = parseFinishedList();
        for (size_t i = 0; i < finished.length(); i++) {
            if (finished[i] == token) {
                parseTask = finished[i];
                remove(finished, &i);
                break;
            }
        }
    }
    MOZ_ASSERT(parseTask);

    if (!maybecx) {
        LeaveParseTaskZone(rt, parseTask);
        return nullptr;
    }

    JSContext* cx = maybecx;
    MOZ_ASSERT(cx->compartment());

    // Make sure we have all the constructors we need for the prototype
    // remapping below, since we can't GC while that's happening.
    Rooted<GlobalObject*> global(cx, &cx->global()->as<GlobalObject>());
    if (!EnsureParserCreatedClasses(cx)) {
        LeaveParseTaskZone(rt, parseTask);
        return nullptr;
    }

    mergeParseTaskCompartment(rt, parseTask, global, cx->compartment());

    if (!parseTask->finish(cx))
        return nullptr;

    RootedScript script(rt, parseTask->script);
    assertSameCompartment(cx, script);

    // Report any error or warnings generated during the parse, and inform the
    // debugger about the compiled scripts.
    for (size_t i = 0; i < parseTask->errors.length(); i++)
        parseTask->errors[i]->throwError(cx);
    if (parseTask->overRecursed)
        ReportOverRecursed(cx);
    if (cx->isExceptionPending())
        return nullptr;

    if (!script) {
        // No error was reported, but no script produced. Assume we hit out of
        // memory.
        ReportOutOfMemory(cx);
        return nullptr;
    }

    // The Debugger only needs to be told about the topmost script that was compiled.
    Debugger::onNewScript(cx, script);

    // Update the compressed source table with the result. This is normally
    // called by setCompressedSource when compilation occurs on the main thread.
    if (script->scriptSource()->hasCompressedSource())
        script->scriptSource()->updateCompressedSourceSet(rt);

    return script;
}

JSScript *
GlobalHelperThreadState::finishParseTask(JSContext *maybecx, JSRuntime *rt, void *token)
{
    ScopedJSDeletePtr<ParseTask> parseTask;

    // The token is a ParseTask* which should be in the finished list.
    // Find and remove its entry.
    {
        AutoLockHelperThreadState lock;
        ParseTaskVector &finished = parseFinishedList();
        for (size_t i = 0; i < finished.length(); i++) {
            if (finished[i] == token) {
                parseTask = finished[i];
                remove(finished, &i);
                break;
            }
        }
    }
    MOZ_ASSERT(parseTask);

    if (!maybecx) {
        LeaveParseTaskZone(rt, parseTask);
        return nullptr;
    }

    JSContext *cx = maybecx;
    MOZ_ASSERT(cx->compartment());

    // Make sure we have all the constructors we need for the prototype
    // remapping below, since we can't GC while that's happening.
    Rooted<GlobalObject*> global(cx, &cx->global()->as<GlobalObject>());
    if (!GlobalObject::ensureConstructor(cx, global, JSProto_Object) ||
        !GlobalObject::ensureConstructor(cx, global, JSProto_Array) ||
        !GlobalObject::ensureConstructor(cx, global, JSProto_Function) ||
        !GlobalObject::ensureConstructor(cx, global, JSProto_RegExp) ||
        !GlobalObject::ensureConstructor(cx, global, JSProto_Iterator))
    {
        LeaveParseTaskZone(rt, parseTask);
        return nullptr;
    }

    LeaveParseTaskZone(rt, parseTask);

    // Point the prototypes of any objects in the script's compartment to refer
    // to the corresponding prototype in the new compartment. This will briefly
    // create cross compartment pointers, which will be fixed by the
    // MergeCompartments call below.
    for (gc::ZoneCellIter iter(parseTask->cx->zone(), gc::FINALIZE_TYPE_OBJECT);
         !iter.done();
         iter.next())
    {
        types::TypeObject *object = iter.get<types::TypeObject>();
        TaggedProto proto(object->proto());
        if (!proto.isObject())
            continue;

        JSProtoKey key = JS::IdentifyStandardPrototype(proto.toObject());
        if (key == JSProto_Null)
            continue;
        MOZ_ASSERT(key == JSProto_Object || key == JSProto_Array ||
                   key == JSProto_Function || key == JSProto_RegExp ||
                   key == JSProto_Iterator);

        JSObject *newProto = GetBuiltinPrototypePure(global, key);
        MOZ_ASSERT(newProto);

        object->setProtoUnchecked(TaggedProto(newProto));
    }

    // Move the parsed script and all its contents into the desired compartment.
    gc::MergeCompartments(parseTask->cx->compartment(), cx->compartment());
    if (!parseTask->finish(cx))
        return nullptr;

    RootedScript script(rt, parseTask->script);
    assertSameCompartment(cx, script);

    // Report any error or warnings generated during the parse, and inform the
    // debugger about the compiled scripts.
    for (size_t i = 0; i < parseTask->errors.length(); i++)
        parseTask->errors[i]->throwError(cx);
    if (parseTask->overRecursed)
        js_ReportOverRecursed(cx);

    if (script) {
        // The Debugger only needs to be told about the topmost script that was compiled.
        GlobalObject *compileAndGoGlobal = nullptr;
        if (script->compileAndGo())
            compileAndGoGlobal = &script->global();
        Debugger::onNewScript(cx, script, compileAndGoGlobal);

        // Update the compressed source table with the result. This is normally
        // called by setCompressedSource when compilation occurs on the main thread.
        if (script->scriptSource()->hasCompressedSource())
            script->scriptSource()->updateCompressedSourceSet(rt);
    }

    return script;
}

bool
BaselineFrame::initForOsr(InterpreterFrame *fp, uint32_t numStackValues)
{
    mozilla::PodZero(this);

    scopeChain_ = fp->scopeChain();

    if (fp->hasCallObjUnchecked())
        flags_ |= BaselineFrame::HAS_CALL_OBJ;

    if (fp->isEvalFrame()) {
        flags_ |= BaselineFrame::EVAL;
        evalScript_ = fp->script();
    }

    if (fp->script()->needsArgsObj() && fp->hasArgsObj()) {
        flags_ |= BaselineFrame::HAS_ARGS_OBJ;
        argsObj_ = &fp->argsObj();
    }

    if (fp->hasReturnValue())
        setReturnValue(fp->returnValue());

    // If the interpreter pushed an SPS frame when it entered the function, the
    // interpreter will pop it after the OSR trampoline returns.  In order for
    // the Baseline frame to have its SPS flag set, it must have its own SPS
    // frame, which the Baseline code will pop on return.  Note that the
    // profiler may have been enabled or disabled after the function was entered
    // but before OSR.
    JSContext *cx = GetJSContextFromJitCode();
    SPSProfiler *p = &(cx->runtime()->spsProfiler);
    if (p->enabled()) {
        p->enter(fp->script(), fp->maybeFun());
        flags_ |= BaselineFrame::HAS_PUSHED_SPS_FRAME;
    }

    frameSize_ = BaselineFrame::FramePointerOffset +
        BaselineFrame::Size() +
        numStackValues * sizeof(Value);

    MOZ_ASSERT(numValueSlots() == numStackValues);

    for (uint32_t i = 0; i < numStackValues; i++)
        *valueSlot(i) = fp->slots()[i];

    if (cx->compartment()->debugMode()) {
        // In debug mode, update any Debugger.Frame objects for the
        // InterpreterFrame to point to the BaselineFrame.

        // The caller pushed a fake return address. ScriptFrameIter, used by the
        // debugger, wants a valid return address, but it's okay to just pick one.
        // In debug mode there's always at least 1 ICEntry (since there are always
        // debug prologue/epilogue calls).
        JitFrameIterator iter(cx);
        MOZ_ASSERT(iter.returnAddress() == nullptr);
        BaselineScript *baseline = fp->script()->baselineScript();
        iter.current()->setReturnAddress(baseline->returnAddressForIC(baseline->icEntry(0)));

        if (!Debugger::handleBaselineOsr(cx, fp, this))
            return false;
    }

    return true;
}