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final: accept markers at line 0

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Back when I introduced debug markers, I seem to have been under the
impression that location line 0 would only ever occur for unknown and
builtin locations.

Though line 0 never comes up in normal processing of source files, and
debug info formats often cannot represent them, I suppose there's no
need to preemptively discard them during final.


for  gcc/ChangeLog

	PR debug/97714
	* final.c (notice_source_line): Narrow down the condition to
	skip a line-0 marker.

for  gcc/testsuite/ChangeLog

	PR debug/97714
	* gcc.dg/debug/pr97714.c: New.
This commit is contained in:
Alexandre Oliva 2020-12-31 21:37:24 -03:00
parent bf5cbb9edf
commit 57450da2fe
2 changed files with 16 additions and 6 deletions
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9
gcc/final.c
View File

@ -3250,12 +3250,11 @@ notice_source_line (rtx_insn *insn, bool *is_stmt)
{
location_t loc = NOTE_MARKER_LOCATION (insn);
expanded_location xloc = expand_location (loc);
if (xloc.line == 0)
{
gcc_checking_assert (LOCATION_LOCUS (loc) == UNKNOWN_LOCATION
|| LOCATION_LOCUS (loc) == BUILTINS_LOCATION);
if (xloc.line == 0
&& (LOCATION_LOCUS (loc) == UNKNOWN_LOCATION
|| LOCATION_LOCUS (loc) == BUILTINS_LOCATION))
return false;
}
filename = xloc.file;
linenum = xloc.line;
columnnum = xloc.column;

11
gcc/testsuite/gcc.dg/debug/pr97714.c Normal file
View File

@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O -g" } */
void
function ()
{
if (0)
{
#line 0 "whatever"
}
}