java exception

Yang Chang
Fri Jun 24 17:32:00 GMT 2005

Dear All,

I am trying to understand the GCJ implementation of Java exception 
mechanism. Currently, I am aware of that the GCJ compiler uses the return 
value of a "gen_reg_rtx(ptr_mode);"  (in function "get_exception_pointer") 
to represent something which holds a reference to an _Unwind_Exception 
struct and such a reference is passed to function _Unwind_RaiseException in 
libjava. However, I couldn't figure out how the two things map each other. 
I mean, how the _Unwind_RaiseException or some other lower level functions 
assign the aforementioned reference to what that rtx represents? and what 
that rtx really represents?

Thank you very much!!

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