public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug preprocessor/34869] New: valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c
@ 2008-01-19 12:00 hp at gcc dot gnu dot org
2008-04-18 16:39 ` [Bug preprocessor/34869] " tromey at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hp at gcc dot gnu dot org @ 2008-01-19 12:00 UTC (permalink / raw)
To: gcc-bugs
A r131535 of trunk (a later revision is recommended, at least >= r131589)
bootstrapped with --enable-langugages=c --enable-checking=release,valgrind
shows these error indications for gcc.dg/cpp/line5.c (as in gcc.log, but only
the first 3 are shown):
Executing on host: /tmp/hptest8/obj/gcc/xgcc -B/tmp/hptest8/obj/gcc/
/tmp/hptest8/gcc/gcc/testsuite/gcc.dg/cpp/line5.c -fpreproc
essed -fno-show-column -E -o line5.i (timeout = 300)
==24251== Conditional jump or move depends on uninitialised value(s)
==24251== at 0x92D27B: _cpp_lex_token (lex.c:783)
==24251== by 0x92F6FC: cpp_get_token (macro.c:1110)
==24251== by 0x4499B7: preprocess_file (c-ppoutput.c:148)
==24251== by 0x4422C0: c_common_init (c-opts.c:1237)
==24251== by 0x44C21D: c_objc_common_init (c-objc-common.c:72)
==24251== by 0x5F5FA7: toplev_main (toplev.c:2128)
==24251== by 0x387301E073: (below main) (in /lib64/libc-2.7.so)
==24251==
==24251== Conditional jump or move depends on uninitialised value(s)
==24251== at 0x92F712: cpp_get_token (macro.c:1137)
==24251== by 0x4499B7: preprocess_file (c-ppoutput.c:148)
==24251== by 0x4422C0: c_common_init (c-opts.c:1237)
==24251== by 0x44C21D: c_objc_common_init (c-objc-common.c:72)
==24251== by 0x5F5FA7: toplev_main (toplev.c:2128)
==24251== by 0x387301E073: (below main) (in /lib64/libc-2.7.so)
==24251==
==24251== Conditional jump or move depends on uninitialised value(s)
==24251== at 0x4499C2: preprocess_file (c-ppoutput.c:150)
==24251== by 0x4422C0: c_common_init (c-opts.c:1237)
==24251== by 0x44C21D: c_objc_common_init (c-objc-common.c:72)
==24251== by 0x5F5FA7: toplev_main (toplev.c:2128)
==24251== by 0x387301E073: (below main) (in /lib64/libc-2.7.so)
--
Summary: valgrind error indication in testsuite from
_cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hp at gcc dot gnu dot org
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34869
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug preprocessor/34869] valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c
2008-01-19 12:00 [Bug preprocessor/34869] New: valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c hp at gcc dot gnu dot org
@ 2008-04-18 16:39 ` tromey at gcc dot gnu dot org
2009-04-23 17:10 ` lauras at gcc dot gnu dot org
2010-02-11 20:58 ` jakub at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: tromey at gcc dot gnu dot org @ 2008-04-18 16:39 UTC (permalink / raw)
To: gcc-bugs
--
tromey at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-04-18 16:38:18
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34869
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug preprocessor/34869] valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c
2008-01-19 12:00 [Bug preprocessor/34869] New: valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c hp at gcc dot gnu dot org
2008-04-18 16:39 ` [Bug preprocessor/34869] " tromey at gcc dot gnu dot org
@ 2009-04-23 17:10 ` lauras at gcc dot gnu dot org
2010-02-11 20:58 ` jakub at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: lauras at gcc dot gnu dot org @ 2009-04-23 17:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from lauras at gcc dot gnu dot org 2009-04-23 17:09 -------
It looks like _cpp_lex_direct lexes ahead even if there unused lookahead
tokens, which later causes uninitialized tokens as reported by valgrind. I am
bootstrapping the patch below which seems to fix the issue.
Index: libcpp/lex.c
===================================================================
--- libcpp/lex.c (revision 146637)
+++ libcpp/lex.c (working copy)
@@ -880,8 +880,8 @@
}
/* Lex a token into RESULT (external interface). Takes care of issues
- like directive handling, token lookahead, multiple include
- optimization and skipping. */
+ like directive handling, multiple include optimization and
+ skipping. */
const cpp_token *
_cpp_lex_token (cpp_reader *pfile)
{
@@ -900,13 +900,7 @@
|| pfile->cur_token >= pfile->cur_run->limit)
abort ();
- if (pfile->lookaheads)
- {
- pfile->lookaheads--;
- result = pfile->cur_token++;
- }
- else
- result = _cpp_lex_direct (pfile);
+ result = _cpp_lex_direct (pfile);
if (result->flags & BOL)
{
@@ -1003,10 +997,11 @@
/* Lex a token into pfile->cur_token, which is also incremented, to
get diagnostics pointing to the correct location.
- Does not handle issues such as token lookahead, multiple-include
- optimization, directives, skipping etc. This function is only
- suitable for use by _cpp_lex_token, and in special cases like
- lex_expansion_token which doesn't care for any of these issues.
+ Is able to handle token lookahead, but does not handle issues such
+ as multiple-include optimization, directives, skipping etc. This
+ function is only suitable for use by _cpp_lex_token, and in special
+ cases like lex_expansion_token which doesn't care for any of these
+ issues.
When meeting a newline, returns CPP_EOF if parsing a directive,
otherwise returns to the start of the token buffer if permissible.
@@ -1019,6 +1014,12 @@
const unsigned char *comment_start;
cpp_token *result = pfile->cur_token++;
+ if (pfile->lookaheads)
+ {
+ pfile->lookaheads--;
+ return result;
+ }
+
fresh_line:
result->flags = 0;
buffer = pfile->buffer;
--
lauras at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lauras at gcc dot gnu dot
| |org
Last reconfirmed|2008-04-18 16:38:18 |2009-04-23 17:09:55
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34869
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug preprocessor/34869] valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c
2008-01-19 12:00 [Bug preprocessor/34869] New: valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c hp at gcc dot gnu dot org
2008-04-18 16:39 ` [Bug preprocessor/34869] " tromey at gcc dot gnu dot org
2009-04-23 17:10 ` lauras at gcc dot gnu dot org
@ 2010-02-11 20:58 ` jakub at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-02-11 20:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2010-02-11 20:57 -------
Should be fixed by
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156720
on the trunk and
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=156721
on the 4.4 branch.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34869
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-02-11 20:58 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-01-19 12:00 [Bug preprocessor/34869] New: valgrind error indication in testsuite from _cpp_lex_token (lex.c:783) with gcc.dg/cpp/line5.c hp at gcc dot gnu dot org
2008-04-18 16:39 ` [Bug preprocessor/34869] " tromey at gcc dot gnu dot org
2009-04-23 17:10 ` lauras at gcc dot gnu dot org
2010-02-11 20:58 ` jakub at gcc dot gnu dot org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).