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Fix var tracking ICE due to reorg. 

If during reorg we delete a code label, and as a result we decide to
delete all the code following that label, we hit this condition in
jump.c:delete_related_insns():

  if (was_code_label && prev && BARRIER_P (prev))                                

which passes and then we proceed to delete insns until we hit a
non-deleted code label.

During this traversal, we can end up deleting a CALL, but in doing so
we will leave the var tracking note for the call arguments around.

Later in dwarf2_var_location() we will ICE, because we can't find the
CALL when we search backwards for it.

gcc/

	* jump.c (delete_related_insns): If we remove a CALL, make sure
	we delete it's NOTE_INSN_CALL_ARG_LOCATION note too.

From-SVN: r187605
This commit is contained in:
David S. Miller 2012-05-16 19:54:19 +00:00 committed by David S. Miller
parent c417a9f2e0
commit bab9f63515
2 changed files with 25 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-05-16 David S. Miller <davem@davemloft.net>
* jump.c (delete_related_insns): If we remove a CALL, make sure
we delete it's NOTE_INSN_CALL_ARG_LOCATION note too.
2012-05-16 Richard Henderson <rth@redhat.com>
PR debug/52727

20
gcc/jump.c
View File

@ -1252,6 +1252,26 @@ delete_related_insns (rtx insn)
if (next != 0 && BARRIER_P (next))
delete_insn (next);
/* If this is a call, then we have to remove the var tracking note
for the call arguments. */
if (CALL_P (insn)
|| (NONJUMP_INSN_P (insn)
&& GET_CODE (PATTERN (insn)) == SEQUENCE
&& CALL_P (XVECEXP (PATTERN (insn), 0, 0))))
{
rtx p = insn;
for (p = NEXT_INSN (p);
p && NOTE_P (p);
p = NEXT_INSN (p))
if (NOTE_KIND (p) == NOTE_INSN_CALL_ARG_LOCATION)
{
remove_insn (p);
break;
}
}
/* If deleting a jump, decrement the count of the label,
and delete the label if it is now unused. */