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flow.c (life_analysis): After life analysis is complete... 

* flow.c (life_analysis): After life analysis is complete, do
        an optional scan over insns looking for REG_LABEL notes that
        reference a deleted label.
        (propagate_block_delete_insn): Verify INOTE is a CODE_LABEL
        before peeking at LABEL_NUSES.

From-SVN: r42131
This commit is contained in:
Jeffrey A Law 2001-05-16 04:12:33 +00:00 committed by Jeff Law
parent 48941cb809
commit fca790eb60
2 changed files with 34 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Tue May 15 22:14:09 2001 Jeffrey A Law (law@cygnus.com)
* flow.c (life_analysis): After life analysis is complete, do
an optional scan over insns looking for REG_LABEL notes that
reference a deleted label.
(propagate_block_delete_insn): Verify INOTE is a CODE_LABEL
before peeking at LABEL_NUSES.
2001-05-15 Richard Henderson <rth@redhat.com>
* unwind-sjlj.c (_Unwind_GetDataRelBase): New.

28
gcc/flow.c
View File

@ -2854,6 +2854,21 @@ life_analysis (f, file, flags)
dump_flow_info (file);
free_basic_block_vars (1);
#ifdef ENABLE_CHECKING
{
rtx insn;
/* Search for any REG_LABEL notes whih reference deleted labels. */
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
{
rtx inote = find_reg_note (insn, REG_LABEL, NULL_RTX);
if (inote && GET_CODE (inote) == NOTE_INSN_DELETED_LABEL)
abort ();
}
}
#endif
}
/* A subroutine of verify_wide_reg, called through for_each_rtx.
@ -3631,9 +3646,18 @@ propagate_block_delete_insn (bb, insn)
/* If the insn referred to a label, and that label was attached to
an ADDR_VEC, it's safe to delete the ADDR_VEC. In fact, it's
pretty much mandatory to delete it, because the ADDR_VEC may be
referencing labels that no longer exist. */
referencing labels that no longer exist.
if (inote)
INSN may reference a deleted label, particularly when a jump
table has been optimized into a direct jump. There's no
real good way to fix up the reference to the deleted label
when the label is deleted, so we just allow it here.
After dead code elimination is complete, we do search for
any REG_LABEL notes which reference deleted labels as a
sanity check. */
if (inote && GET_CODE (inote) == CODE_LABEL)
{
rtx label = XEXP (inote, 0);
rtx next;