ios

Implicit declaration of function 'instrumentObjcMessageSends' is invalid in C99

FIX: add 

extern void instrumentObjcMessageSends(BOOL);

也可以lldb> call (void)instrumentObjcMessageSends(YES)

_objc_msgForward在进行消息转发的过程中会涉及以下这几个方法：resolveInstanceMethod:方法 (或 resolveClassMethod:)。forwardingTargetForSelector:方法methodSignatureForSelector:方法forwardInvocation:方法doesNotRecognizeSelector: 方法