Figure 10- 84 Inspect cross references
Figure 10- 85 [IMChatRegistry _registerChatDictionary:forChat:isIncoming:newGUID:]
According to the above figures, IMChat comes from the 2nd argument of [IMChatRegistry
_registerChatDictionary:forChat:isIncoming:newGUID:], whose caller is:
Process 248623 stopped
* thread #1: tid = 0x3cb2f, 0x33235944 IMCore`___lldb_unnamed_function2048$$IMCore,
queue = 'com.apple.main-thread, stop reason = breakpoint 17.1