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re PR c/10175 (-Wunreachable-code doesn't work for single lines) 

PR c/10175
        * jump.c (never_reached_warning): Look backwards for a line note.

From-SVN: r65228
This commit is contained in:
Jason Merrill 2003-04-03 20:22:47 -05:00
parent 250abc11ec
commit 3e22acbe17
2 changed files with 18 additions and 3 deletions
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9
gcc/ChangeLog
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@ -1,7 +1,12 @@
2003-04-03 Jason Merrill <jason@redhat.com>
PR c/10175
* jump.c (never_reached_warning): Look backwards for a line note.
2003-04-02 Richard Henderson <rth@redhat.com>
* dwarf2out.c (output_call_frame_info): Ignore fde->nothrow as an
optimization when flag_exceptions not enabled.
* dwarf2out.c (output_call_frame_info): Ignore fde->nothrow as an
optimization when flag_exceptions not enabled.
2003-03-30 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>

12
gcc/jump.c
View File

@ -1954,10 +1954,20 @@ never_reached_warning (avoided_insn, finish)
if (!warn_notreached)
return;
/* Back up to the first of any NOTEs preceding avoided_insn; flow passes
us the head of a block, a NOTE_INSN_BASIC_BLOCK, which often follows
the line note. */
for (insn = PREV_INSN (avoided_insn); ; insn = PREV_INSN (insn))
if (GET_CODE (insn) != NOTE)
{
insn = NEXT_INSN (insn);
break;
}
/* Scan forwards, looking at LINE_NUMBER notes, until we hit a LABEL
in case FINISH is NULL, otherwise until we run out of insns. */
for (insn = avoided_insn; insn != NULL; insn = NEXT_INSN (insn))
for (; insn != NULL; insn = NEXT_INSN (insn))
{
if ((finish == NULL && GET_CODE (insn) == CODE_LABEL)
|| GET_CODE (insn) == BARRIER)