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| author | Jakub Jelinek <jakub@redhat.com> | 2002-02-12 22:39:42 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2002-02-12 22:39:42 +0100 |
| commit | 56d4428505c7dd85bf6a49dd9b22497331b39341 (patch) | |
| tree | c47e31ee211f6ebb4c3412768ea592590252152c /gcc/jump.c | |
| parent | 34e68c86fb3567f1046c4136bfec656387029613 (diff) | |
| download | gcc-56d4428505c7dd85bf6a49dd9b22497331b39341.tar.gz | |
jump.c (never_reached_warning): Add finish argument.
* jump.c (never_reached_warning): Add finish argument.
If finish is NULL, stop on CODE_LABEL, otherwise stop before first
real insn after end.
* rtl.h (never_reached_warning): Adjust prototype.
* cse.c (cse_insn): Pass NULL as finish to never_reached_warning.
* cfgrtl.c (flow_delete_block): Pass b->end as finish to
never_reached_warning.
* gcc.dg/Wunreachable-1.c: New test.
* gcc.dg/Wunreachable-2.c: New test.
From-SVN: r49713
Diffstat (limited to 'gcc/jump.c')
| -rw-r--r-- | gcc/jump.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/gcc/jump.c b/gcc/jump.c index fcb3c61800b..fc6bef07e48 100644 --- a/gcc/jump.c +++ b/gcc/jump.c @@ -1913,13 +1913,12 @@ delete_for_peephole (from, to) so it's possible to get spurious warnings from this. */ void -never_reached_warning (avoided_insn) - rtx avoided_insn; +never_reached_warning (avoided_insn, finish) + rtx avoided_insn, finish; { rtx insn; rtx a_line_note = NULL; - int two_avoided_lines = 0; - int contains_insn = 0; + int two_avoided_lines = 0, contains_insn = 0, reached_end = 0; if (! warn_notreached) return; @@ -1929,10 +1928,11 @@ never_reached_warning (avoided_insn) for (insn = avoided_insn; insn != NULL; insn = NEXT_INSN (insn)) { - if (GET_CODE (insn) == CODE_LABEL) + if (finish == NULL && GET_CODE (insn) == CODE_LABEL) break; - else if (GET_CODE (insn) == NOTE /* A line number note? */ - && NOTE_LINE_NUMBER (insn) >= 0) + + if (GET_CODE (insn) == NOTE /* A line number note? */ + && NOTE_LINE_NUMBER (insn) >= 0) { if (a_line_note == NULL) a_line_note = insn; @@ -1941,7 +1941,14 @@ never_reached_warning (avoided_insn) != NOTE_LINE_NUMBER (insn)); } else if (INSN_P (insn)) - contains_insn = 1; + { + if (reached_end) + break; + contains_insn = 1; + } + + if (insn == finish) + reached_end = 1; } if (two_avoided_lines && contains_insn) warning_with_file_and_line (NOTE_SOURCE_FILE (a_line_note), |