Saves the exception state from the specified context.
JSExceptionState * JS_SaveExceptionState(JSContext *cx);
||Pointer to a JS context from which to derive runtime information. Requires request. In a
Saves the current exception state (that is, any pending exception, or a cleared exception state) associated with the specified context
cx, and returns a
JSExceptionState object holding this state. That object may then be used to restore again the context using
JS_RestoreExceptionState, or discarded using
JS_DropExceptionState. Either of those two functions frees any memory used by the
JSExceptionState created by this function automatically roots any pending exception object which needs to be protected from the GC.
This function returns
NULL if the engine was not built with support for exceptions.