C++ HandleValue::isNullOrUndefined方法代码示例

本文整理汇总了C++中HandleValue::isNullOrUndefined方法的典型用法代码示例。如果您正苦于以下问题：C++ HandleValue::isNullOrUndefined方法的具体用法？C++ HandleValue::isNullOrUndefined怎么用？C++ HandleValue::isNullOrUndefined使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类HandleValue的用法示例。

在下文中一共展示了HandleValue::isNullOrUndefined方法的10个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: selfHostedObject

static bool
CloneValue(JSContext *cx, HandleValue selfHostedValue, MutableHandleValue vp)
{
    if (selfHostedValue.isObject()) {
        RootedObject selfHostedObject(cx, &selfHostedValue.toObject());
        JSObject *clone = CloneObject(cx, selfHostedObject);
        if (!clone)
            return false;
        vp.setObject(*clone);
    } else if (selfHostedValue.isBoolean() || selfHostedValue.isNumber() || selfHostedValue.isNullOrUndefined()) {
        // Nothing to do here: these are represented inline in the value.
        vp.set(selfHostedValue);
    } else if (selfHostedValue.isString()) {
        if (!selfHostedValue.toString()->isFlat())
            MOZ_CRASH();
        JSFlatString *selfHostedString = &selfHostedValue.toString()->asFlat();
        JSString *clone = CloneString(cx, selfHostedString);
        if (!clone)
            return false;
        vp.setString(clone);
    } else {
        MOZ_CRASH("Self-hosting CloneValue can't clone given value.");
    }
    return true;
}

开发者ID:L2-D2，项目名称:gecko-dev，代码行数:25，代码来源:SelfHosting.cpp

示例2: selfHostedObject

static bool
CloneValue(JSContext *cx, HandleValue selfHostedValue, MutableHandleValue vp)
{
    if (selfHostedValue.isObject()) {
        RootedNativeObject selfHostedObject(cx, &selfHostedValue.toObject().as<NativeObject>());
        JSObject *clone = CloneObject(cx, selfHostedObject);
        if (!clone)
            return false;
        vp.setObject(*clone);
    } else if (selfHostedValue.isBoolean() || selfHostedValue.isNumber() || selfHostedValue.isNullOrUndefined()) {
        // Nothing to do here: these are represented inline in the value.
        vp.set(selfHostedValue);
    } else if (selfHostedValue.isString()) {
        if (!selfHostedValue.toString()->isFlat())
            MOZ_CRASH();
        JSFlatString *selfHostedString = &selfHostedValue.toString()->asFlat();
        JSString *clone = CloneString(cx, selfHostedString);
        if (!clone)
            return false;
        vp.setString(clone);
    } else if (selfHostedValue.isSymbol()) {
        // Well-known symbols are shared.
        mozilla::DebugOnly<JS::Symbol *> sym = selfHostedValue.toSymbol();
        MOZ_ASSERT(sym->isWellKnownSymbol());
        MOZ_ASSERT(cx->wellKnownSymbols().get(size_t(sym->code())) == sym);
        vp.set(selfHostedValue);
    } else {
        MOZ_CRASH("Self-hosting CloneValue can't clone given value.");
    }
    return true;
}

开发者ID:fatman2021，项目名称:gecko-dev，代码行数:31，代码来源:SelfHosting.cpp

示例3: CallArgsFromVp

static bool
ProtoSetter(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    HandleValue thisv = args.thisv();
    if (thisv.isNullOrUndefined()) {
        ReportIncompatible(cx, args);
        return false;
    }
    if (thisv.isPrimitive()) {
        // Mutating a boxed primitive's [[Prototype]] has no side effects.
        args.rval().setUndefined();
        return true;
    }

    if (!cx->runningWithTrustedPrincipals())
        ++sSetProtoCalled;

    Rooted<JSObject*> obj(cx, &args.thisv().toObject());

    /* Do nothing if __proto__ isn't being set to an object or null. */
    if (args.length() == 0 || !args[0].isObjectOrNull()) {
        args.rval().setUndefined();
        return true;
    }

    Rooted<JSObject*> newProto(cx, args[0].toObjectOrNull());
    if (!SetPrototype(cx, obj, newProto))
        return false;

    args.rval().setUndefined();
    return true;
}

开发者ID:MekliCZ，项目名称:positron，代码行数:34，代码来源:Object.cpp

示例4: ToString

bool
xpc_qsJsvalToCharStr(JSContext *cx, HandleValue v, JSAutoByteString *bytes)
{
    MOZ_ASSERT(!bytes->ptr());

    if (v.isNullOrUndefined())
      return true;

    JSString *str = ToString(cx, v);
    if (!str)
      return false;
    return !!bytes->encodeLatin1(cx, str);
}

开发者ID:iHaD，项目名称:Spidermonkey，代码行数:13，代码来源:XPCQuickStubs.cpp

示例5:

static bool
TestProtoSetterThis(HandleValue v)
{
    if (v.isNullOrUndefined())
        return false;

    /* These will work as if on a boxed primitive; dumb, but whatever. */
    if (!v.isObject())
        return true;

    /* Otherwise, only accept non-proxies. */
    return !v.toObject().is<ProxyObject>();
}

开发者ID:chenghuk，项目名称:mozilla-central，代码行数:13，代码来源:GlobalObject.cpp

示例6: obj

static bool
ProtoGetter(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    HandleValue thisv = args.thisv();
    if (thisv.isNullOrUndefined()) {
        ReportIncompatible(cx, args);
        return false;
    }
    if (thisv.isPrimitive() && !BoxNonStrictThis(cx, args))
        return false;

    RootedObject obj(cx, &args.thisv().toObject());
    RootedObject proto(cx);
    if (!GetPrototype(cx, obj, &proto))
        return false;
    args.rval().setObjectOrNull(proto);
    return true;
}

开发者ID:logicoftekk，项目名称:cyberfox，代码行数:19，代码来源:Object.cpp

示例7: callee

static bool
ProtoSetter(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Do this here, rather than after the this-check so even likely-buggy
    // use of the __proto__ setter on unacceptable values, where no subsequent
    // use occurs on an acceptable value, will trigger a warning.
    RootedObject callee(cx, &args.callee());
    if (!GlobalObject::warnOnceAboutPrototypeMutation(cx, callee))
       return false;

    HandleValue thisv = args.thisv();
    if (thisv.isNullOrUndefined()) {
        ReportIncompatible(cx, args);
        return false;
    }
    if (thisv.isPrimitive()) {
        // Mutating a boxed primitive's [[Prototype]] has no side effects.
        args.rval().setUndefined();
        return true;
    }

    if (!cx->runningWithTrustedPrincipals())
        ++sSetProtoCalled;

    Rooted<JSObject*> obj(cx, &args.thisv().toObject());

    /* Do nothing if __proto__ isn't being set to an object or null. */
    if (args.length() == 0 || !args[0].isObjectOrNull()) {
        args.rval().setUndefined();
        return true;
    }

    Rooted<JSObject*> newProto(cx, args[0].toObjectOrNull());
    if (!SetPrototype(cx, obj, newProto))
        return false;

    args.rval().setUndefined();
    return true;
}

开发者ID:logicoftekk，项目名称:cyberfox，代码行数:41，代码来源:Object.cpp

示例8: obj

static bool
ProtoSetterImpl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(TestProtoThis(args.thisv()));

    HandleValue thisv = args.thisv();
    if (thisv.isPrimitive()) {
        JS_ASSERT(!thisv.isNullOrUndefined());

        // Mutating a boxed primitive's [[Prototype]] has no side effects.
        args.rval().setUndefined();
        return true;
    }

    if (!cx->runningWithTrustedPrincipals())
        ++sSetProtoCalled;

    Rooted<JSObject*> obj(cx, &args.thisv().toObject());

    /* Do nothing if __proto__ isn't being set to an object or null. */
    if (args.length() == 0 || !args[0].isObjectOrNull()) {
        args.rval().setUndefined();
        return true;
    }

    Rooted<JSObject*> newProto(cx, args[0].toObjectOrNull());

    bool success;
    if (!JSObject::setProto(cx, obj, newProto, &success))
        return false;

    if (!success) {
        js_ReportValueError(cx, JSMSG_SETPROTOTYPEOF_FAIL, JSDVG_IGNORE_STACK, thisv, js::NullPtr());
        return false;
    }

    args.rval().setUndefined();
    return true;
}

开发者ID:elefant，项目名称:gecko-dev，代码行数:39，代码来源:GlobalObject.cpp

示例9:

static bool
TestProtoThis(HandleValue v)
{
    return !v.isNullOrUndefined();
}

开发者ID:elefant，项目名称:gecko-dev，代码行数:5，代码来源:GlobalObject.cpp

示例10: nid

static bool
ProtoSetterImpl(JSContext *cx, CallArgs args)
{
    JS_ASSERT(TestProtoSetterThis(args.thisv()));

    HandleValue thisv = args.thisv();
    if (thisv.isPrimitive()) {
        JS_ASSERT(!thisv.isNullOrUndefined());

        // Mutating a boxed primitive's [[Prototype]] has no side effects.
        args.rval().setUndefined();
        return true;
    }

    if (!cx->runningWithTrustedPrincipals())
        ++sSetProtoCalled;

    Rooted<JSObject*> obj(cx, &args.thisv().toObject());

    /* ES5 8.6.2 forbids changing [[Prototype]] if not [[Extensible]]. */
    bool extensible;
    if (!JSObject::isExtensible(cx, obj, &extensible))
        return false;
    if (!extensible) {
        obj->reportNotExtensible(cx);
        return false;
    }

    /*
     * Disallow mutating the [[Prototype]] of a proxy that wasn't simply
     * wrapping some other object.  Also disallow it on ArrayBuffer objects,
     * which due to their complicated delegate-object shenanigans can't easily
     * have a mutable [[Prototype]].
     */
    if (obj->is<ProxyObject>() || obj->is<ArrayBufferObject>()) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
                             "Object", "__proto__ setter",
                             obj->is<ProxyObject>() ? "Proxy" : "ArrayBuffer");
        return false;
    }

    /* Do nothing if __proto__ isn't being set to an object or null. */
    if (args.length() == 0 || !args[0].isObjectOrNull()) {
        args.rval().setUndefined();
        return true;
    }

    Rooted<JSObject*> newProto(cx, args[0].toObjectOrNull());

    unsigned dummy;
    RootedId nid(cx, NameToId(cx->names().proto));
    RootedValue v(cx);
    if (!CheckAccess(cx, obj, nid, JSAccessMode(JSACC_PROTO | JSACC_WRITE), &v, &dummy))
        return false;

    if (!SetClassAndProto(cx, obj, obj->getClass(), newProto, true))
        return false;

    args.rval().setUndefined();
    return true;
}

开发者ID:chenghuk，项目名称:mozilla-central，代码行数:61，代码来源:GlobalObject.cpp

注：本文中的HandleValue::isNullOrUndefined方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。