本文整理汇总了C++中MutableHandleValue::isNull方法的典型用法代码示例。如果您正苦于以下问题：C++ MutableHandleValue::isNull方法的具体用法？C++ MutableHandleValue::isNull怎么用？C++ MutableHandleValue::isNull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MutableHandleValue的用法示例。
在下文中一共展示了MutableHandleValue::isNull方法的2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: bytes
// ES8 rev 0c1bd3004329336774cbc90de727cd0cf5f11e93 7.3.9 GetMethod,
// reimplemented for proxy handler trap-getting to produce better error
// messages.
static bool
GetProxyTrap(JSContext* cx, HandleObject handler, HandlePropertyName name, MutableHandleValue func)
{
// Steps 2, 5.
if (!GetProperty(cx, handler, handler, name, func))
return false;
// Step 3.
if (func.isUndefined())
return true;
if (func.isNull()) {
func.setUndefined();
return true;
}
// Step 4.
if (!IsCallable(func)) {
JSAutoByteString bytes(cx, name);
if (!bytes)
return false;
JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_BAD_TRAP, bytes.ptr());
return false;
}
return true;
}示例2: iter
static JSBool
fun_getProperty(JSContext *cx, HandleObject obj_, HandleId id, MutableHandleValue vp)
{
JSObject *obj = obj_;
while (!obj->isFunction()) {
obj = obj->getProto();
if (!obj)
return true;
}
JSFunction *fun = obj->toFunction();
/*
* Mark the function's script as uninlineable, to expand any of its
* frames on the stack before we go looking for them. This allows the
* below walk to only check each explicit frame rather than needing to
* check any calls that were inlined.
*/
if (fun->isInterpreted()) {
fun->script()->uninlineable = true;
MarkTypeObjectFlags(cx, fun, OBJECT_FLAG_UNINLINEABLE);
}
/* Set to early to null in case of error */
vp.setNull();
/* Find fun's top-most activation record. */
StackIter iter(cx);
for (; !iter.done(); ++iter) {
if (!iter.isFunctionFrame() || iter.isEvalFrame())
continue;
if (iter.callee() == fun)
break;
}
if (iter.done())
return true;
StackFrame *fp = iter.fp();
if (JSID_IS_ATOM(id, cx->runtime->atomState.argumentsAtom)) {
if (fun->hasRest()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_FUNCTION_ARGUMENTS_AND_REST);
return false;
}
/* Warn if strict about f.arguments or equivalent unqualified uses. */
if (!JS_ReportErrorFlagsAndNumber(cx, JSREPORT_WARNING | JSREPORT_STRICT, js_GetErrorMessage,
NULL, JSMSG_DEPRECATED_USAGE, js_arguments_str)) {
return false;
}
ArgumentsObject *argsobj = ArgumentsObject::createUnexpected(cx, fp);
if (!argsobj)
return false;
vp.setObject(*argsobj);
return true;
}
#ifdef JS_METHODJIT
if (JSID_IS_ATOM(id, cx->runtime->atomState.callerAtom) && fp && fp->prev()) {
/*
* If the frame was called from within an inlined frame, mark the
* innermost function as uninlineable to expand its frame and allow us
* to recover its callee object.
*/
InlinedSite *inlined;
jsbytecode *prevpc = fp->prevpc(&inlined);
if (inlined) {
mjit::JITChunk *chunk = fp->prev()->jit()->chunk(prevpc);
JSFunction *fun = chunk->inlineFrames()[inlined->inlineIndex].fun;
fun->script()->uninlineable = true;
MarkTypeObjectFlags(cx, fun, OBJECT_FLAG_UNINLINEABLE);
}
}
#endif
if (JSID_IS_ATOM(id, cx->runtime->atomState.callerAtom)) {
++iter;
if (iter.done() || !iter.isFunctionFrame()) {
JS_ASSERT(vp.isNull());
return true;
}
vp.set(iter.calleev());
/* Censor the caller if it is from another compartment. */
JSObject &caller = vp.toObject();
if (caller.compartment() != cx->compartment) {
vp.setNull();
} else if (caller.isFunction()) {
JSFunction *callerFun = caller.toFunction();
if (callerFun->isInterpreted() && callerFun->inStrictMode()) {
JS_ReportErrorFlagsAndNumber(cx, JSREPORT_ERROR, js_GetErrorMessage, NULL,
JSMSG_CALLER_IS_STRICT);
return false;
}
}
return true;
}
//.........这里部分代码省略.........