如果我在V8中没有HandleScope的情况下新建一个Local <值>，会发生什么？

Question

是允许的吗？或者如果我这样做会发生什么。 这个处理程序是不是由GC跟踪，还是由GC跟踪但未发布？

在v8.h：

 /**
 * A stack-allocated class that governs a number of local handles.
 * After a handle scope has been created, all local handles will be
 * allocated within that handle scope until either the handle scope is
 * deleted or another handle scope is created.  If there is already a
* handle scope and a new one is created, all allocations will take
* place in the new handle scope until it is deleted.  After that,
 * new handles will again be allocated in the original handle scope.
*
* After the handle scope of a local handle has been deleted the
* garbage collector will no longer track the object stored in the
* handle and may deallocate it.  The behavior of accessing a handle
* for which the handle scope has been deleted is undefined.
*/
class V8_EXPORT HandleScope {

Answer 1

V8爆炸了。如果您正在运行调试版本，您将收到更好的错误消息，但它会崩溃。

关于“check_api_usage”或类似的东西。

我已经看过很多次了。

如果您需要保持比词法范围更长的javascript值，则需要将其放入（更昂贵的）v8::Global<T>对象中。请注意，global是仅移动的，类似于unique_ptr。