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Preserve programmer specified labels, and emit debug info for them even if

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they are deleted.

From-SVN: r25883
This commit is contained in:
Nick Clifton 1999-03-21 12:14:09 +00:00 committed by Nick Clifton
parent 0fdb7c85ce
commit 088e716060
4 changed files with 35 additions and 4 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
Sun Mar 21 12:13:01 1999 Nick Clifton <nickc@cygnus.com>
* flow.c (can_delete_label_p): Do not allow user specified
labels to be deleted.
* dwarf2out.c (gen_label_die): Generate addresses for deleted
(programmer specified) labels.
* dwarfout.c (output_label_die): Generate addresses for deleted
(programmer specified) labels.
1999-03-21 Manfred Hollstein <manfred@s-direktnet.de>
* Makefile.in (xgcc$(exeext)): Add intl.o to list of files to be

8
gcc/dwarf2out.c
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@ -8583,7 +8583,13 @@ gen_label_die (decl, context_die)
else
{
insn = DECL_RTL (decl);
if (GET_CODE (insn) == CODE_LABEL)
/* Deleted labels are programmer specified labels which have been
eliminated because of various optimisations. We still emit them
here so that it is possible to put breakpoints on them. */
if (GET_CODE (insn) == CODE_LABEL
|| ((GET_CODE (insn) == NOTE
&& NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL)))
{
/* When optimization is enabled (via -O) some parts of the compiler
(e.g. jump.c and cse.c) may try to delete CODE_LABEL insns which

7
gcc/dwarfout.c
View File

@ -3519,7 +3519,12 @@ output_label_die (arg)
{
register rtx insn = DECL_RTL (decl);
if (GET_CODE (insn) == CODE_LABEL)
/* Deleted labels are programmer specified labels which have been
eliminated because of various optimisations. We still emit them
here so that it is possible to put breakpoints on them. */
if (GET_CODE (insn) == CODE_LABEL
|| ((GET_CODE (insn) == NOTE
&& NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL)))
{
char label[MAX_ARTIFICIAL_LABEL_BYTES];

15
gcc/flow.c
View File

@ -376,7 +376,7 @@ find_basic_blocks (f, nregs, file)
bb_eh_end = (rtx *) alloca (n_basic_blocks * sizeof (rtx));
label_value_list = find_basic_blocks_1 (f, bb_eh_end);
/* Record the block to which an insn belongs. */
/* ??? This should be done another way, by which (perhaps) a label is
tagged directly with the basic block that it starts. It is used for
@ -1241,7 +1241,7 @@ split_edge (edge_in)
pos = emit_jump_insn_after (gen_jump (old_succ->head), pos);
jump_block->end = pos;
emit_barrier_after (pos);
/* ... and clear fallthru on the outgoing edge. */
e->flags &= ~EDGE_FALLTHRU;
@ -1649,6 +1649,7 @@ delete_block (b)
notes. */
insn = b->head;
if (GET_CODE (insn) == CODE_LABEL)
{
rtx x, *prev = &exception_handler_labels;
@ -1793,6 +1794,16 @@ can_delete_label_p (label)
if (label == XEXP (x, 0))
return 0;
/* User declared labels must be preserved, but we can
convert them into a NOTE instead. */
if (LABEL_NAME (label) != 0)
{
PUT_CODE (label, NOTE);
NOTE_LINE_NUMBER (label) = NOTE_INSN_DELETED_LABEL;
NOTE_SOURCE_FILE (label) = 0;
return 0;
}
return 1;
}