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function.c (thread_prologue_epilogue_insns): Don't move the line note at the head of the chain.

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* function.c (thread_prologue_epilogue_insns): Don't move the
        line note at the head of the chain.  Only force a lineno note
        before the end of block 0.

From-SVN: r34207
This commit is contained in:
Richard Henderson 2000-05-27 13:10:38 -07:00 • committed by Richard Henderson
parent 892ecf921f
commit 30196c1ff4
2 changed files with 33 additions and 24 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-05-27 Richard Henderson <rth@cygnus.com>
* function.c (thread_prologue_epilogue_insns): Don't move the
line note at the head of the chain. Only force a lineno note
before the end of block 0.
2000-05-27 Richard Henderson <rth@cygnus.com>
* gensupport.c (collect_insn_data): Record the maximum number

51
gcc/function.c
View file

@ -7038,10 +7038,11 @@ epilogue_done:
rtx insn, prev;
/* GDB handles `break f' by setting a breakpoint on the first
line note *after* the prologue. Which means (1) that if
line note after the prologue. Which means (1) that if
there are line number notes before where we inserted the
prologue we should move them, and (2) if there is no such
note, then we should generate one at the prologue. */
prologue we should move them, and (2) we should generate a
note before the end of the first basic block, if there isn't
one already there. */
for (insn = prologue_end; insn ; insn = prev)
{
@ -7050,32 +7051,34 @@ epilogue_done:
{
/* Note that we cannot reorder the first insn in the
chain, since rest_of_compilation relies on that
remaining constant. Do the next best thing. */
remaining constant. */
if (prev == NULL)
{
emit_line_note_after (NOTE_SOURCE_FILE (insn),
NOTE_LINE_NUMBER (insn),
prologue_end);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
}
else
reorder_insns (insn, insn, prologue_end);
break;
reorder_insns (insn, insn, prologue_end);
}
}
insn = NEXT_INSN (prologue_end);
if (! insn || GET_CODE (insn) != NOTE || NOTE_LINE_NUMBER (insn) <= 0)
/* Find the last line number note in the first block. */
for (insn = BASIC_BLOCK (0)->end;
insn != prologue_end;
insn = PREV_INSN (insn))
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
break;
/* If we didn't find one, make a copy of the first line number
we run across. */
if (! insn)
{
for (insn = next_active_insn (f); insn ; insn = PREV_INSN (insn))
{
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
{
emit_line_note_after (NOTE_SOURCE_FILE (insn),
NOTE_LINE_NUMBER (insn),
prologue_end);
break;
}
}
for (insn = next_active_insn (prologue_end);
insn;
insn = PREV_INSN (insn))
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
{
emit_line_note_after (NOTE_SOURCE_FILE (insn),
NOTE_LINE_NUMBER (insn),
prologue_end);
break;
}
}
}
#endif