basic block reordering + java

Fri Sep 21 07:26:00 GMT 2001

With basic block reordering, we often see code from gcj that ends in...
.L20:
 call _Jv_ThrowNullPointerException
.L21:
 call _Jv_ThrowNullPointerException
.L22:
 call _Jv_ThrowNullPointerException
.L23:
 call _Jv_ThrowNullPointerException
.L24:
 call _Jv_ThrowNullPointerException
.L25:
 call _Jv_ThrowNullPointerException
.L26:
 call _Jv_ThrowNullPointerException
Is there an easy way for GCC to merge identical blocks?
Also, I find that if the last NullPointerException branch is taken,
printStackTrace() will produce incorrect results. You end up seeing the
function after this in place of the one calling _Jv_ThrowNullPointerException.
Should we be backing up the program counter somewhere? (or emitting a NOP at
the very end of each function?)
AG