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From: Philippe W. <phi...@so...> - 2017-11-16 22:57:09
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=53faacfda4ad6a27bc0e8ab859c1cc5388a61a5e commit 53faacfda4ad6a27bc0e8ab859c1cc5388a61a5e Author: Philippe Waroquiers <phi...@sk...> Date: Thu Nov 16 22:53:46 2017 +0100 Bypass gcc code generation bug triggered by -finline-functions commit 7dd9a7f8b3118c25014b0a77aff899e517c46bcd has added the flag -finline-functions. This triggers a code generation bug in gcc 6.3.0 (at least with gcc version 6.3.0 20170516 (Debian 6.3.0-18)). (this bug can be reproduced e.g. on gcc67, which is a debian 9.2 system) The bad code causes the debug trace to be indented by more than 500 characters, giving e.g. for the first debug line produced by stage 2: --12305:1:launcher launching /home/philippe/valgrind/git/smallthing/./.in_place/memcheck-amd64-linux --12305:1:debuglog DebugLog system started by Stage 2 (main), level 1 logging requested This commit bypasses the code generation bug, by moving the indent calculation just before its usage. Note: on amd64/x86, the code size of memcheck tool increases by about 12% with -finline-functions. In terms of perf impact (using perf/vg_perf) this gives mixed results : memcheck is usually slightly faster, but some tests are slower (e.g. heap_pdb4) callgrind is usually slower, but some tests are faster helgrind : some tests are slowed down, some tests are faster (some significantly faster such as sarp and ffbench). See below 2 runs of comparing trunk (with -finline-functions) with fixes (which does not have -finline-functions). -- Running tests in perf ---------------------------------------------- -- bigcode1 -- bigcode1 trunk_untouched:0.07s me: 2.2s (32.0x, -----) he: 1.7s (23.9x, -----) ca: 9.0s (129.0x, -----) bigcode1 fixes :0.07s me: 2.3s (32.3x, -0.9%) he: 1.7s (23.9x, 0.0%) ca: 8.8s (125.4x, 2.8%) -- bigcode2 -- bigcode2 trunk_untouched:0.07s me: 5.0s (72.1x, -----) he: 3.2s (46.0x, -----) ca:18.6s (266.4x, -----) bigcode2 fixes :0.07s me: 5.1s (73.0x, -1.2%) he: 3.2s (46.1x, -0.3%) ca:18.4s (262.9x, 1.3%) -- bz2 -- bz2 trunk_untouched:0.43s me: 4.5s (10.4x, -----) he: 6.7s (15.5x, -----) ca:10.4s (24.2x, -----) bz2 fixes :0.43s me: 4.5s (10.5x, -0.4%) he: 6.7s (15.5x, 0.0%) ca:10.1s (23.4x, 3.4%) -- fbench -- fbench trunk_untouched:0.14s me: 2.7s (19.6x, -----) he: 1.9s (13.4x, -----) ca: 4.0s (28.3x, -----) fbench fixes :0.14s me: 2.8s (19.9x, -1.8%) he: 2.0s (14.6x, -8.5%) ca: 3.9s (28.1x, 0.8%) -- ffbench -- ffbench trunk_untouched:0.15s me: 2.6s (17.1x, -----) he: 3.4s (22.4x, -----) ca: 1.5s (10.1x, -----) ffbench fixes :0.15s me: 2.6s (17.3x, -0.8%) he: 3.1s (20.9x, 6.8%) ca: 1.5s (10.0x, 1.3%) -- heap -- heap trunk_untouched:0.05s me: 3.6s (72.8x, -----) he: 5.0s (100.0x, -----) ca: 4.9s (98.2x, -----) heap fixes :0.05s me: 3.7s (73.6x, -1.1%) he: 5.1s (102.4x, -2.4%) ca: 4.8s (95.6x, 2.6%) -- heap_pdb4 -- heap_pdb4 trunk_untouched:0.06s me: 5.9s (97.7x, -----) he: 5.6s (93.7x, -----) ca: 5.2s (86.8x, -----) heap_pdb4 fixes :0.06s me: 5.8s (96.0x, 1.7%) he: 5.7s (95.3x, -1.8%) ca: 5.3s (87.7x, -1.0%) -- many-loss-records -- many-loss-records trunk_untouched:0.01s me: 1.0s (101.0x, -----) he: 0.8s (85.0x, -----) ca: 0.8s (78.0x, -----) many-loss-records fixes :0.01s me: 1.0s (100.0x, 1.0%) he: 0.9s (86.0x, -1.2%) ca: 0.8s (78.0x, 0.0%) -- many-xpts -- many-xpts trunk_untouched:0.03s me: 1.1s (38.3x, -----) he: 1.4s (46.0x, -----) ca: 1.9s (62.7x, -----) many-xpts fixes :0.03s me: 1.1s (37.0x, 3.5%) he: 1.4s (47.0x, -2.2%) ca: 1.8s (61.3x, 2.1%) -- memrw -- memrw trunk_untouched:0.04s me: 0.9s (21.5x, -----) he: 2.3s (58.0x, -----) ca: 1.9s (46.8x, -----) memrw fixes :0.04s me: 0.9s (22.0x, -2.3%) he: 2.3s (58.0x, 0.0%) ca: 1.9s (47.2x, -1.1%) -- sarp -- sarp trunk_untouched:0.02s me: 1.5s (77.0x, -----) he: 3.4s (168.5x, -----) ca: 1.3s (63.0x, -----) sarp fixes :0.02s me: 1.6s (80.0x, -3.9%) he: 4.0s (200.5x,-19.0%) ca: 1.3s (65.5x, -4.0%) -- tinycc -- tinycc trunk_untouched:0.10s me: 6.7s (66.7x, -----) he: 6.6s (65.9x, -----) ca: 7.2s (72.4x, -----) tinycc fixes :0.10s me: 6.6s (66.0x, 1.0%) he: 6.8s (68.0x, -3.2%) ca: 7.2s (72.1x, 0.4%) -- Finished tests in perf ---------------------------------------------- == 12 programs, 72 timings ================= -- Running tests in perf ---------------------------------------------- -- bigcode1 -- bigcode1 trunk_untouched:0.07s me: 2.2s (32.0x, -----) he: 1.7s (23.7x, -----) ca: 9.0s (129.1x, -----) bigcode1 fixes :0.07s me: 2.3s (32.3x, -0.9%) he: 1.7s (23.9x, -0.6%) ca: 8.8s (125.3x, 3.0%) -- bigcode2 -- bigcode2 trunk_untouched:0.07s me: 5.0s (72.1x, -----) he: 3.2s (46.0x, -----) ca:18.7s (266.6x, -----) bigcode2 fixes :0.07s me: 5.1s (72.9x, -1.0%) he: 3.2s (46.0x, 0.0%) ca:18.5s (263.7x, 1.1%) -- bz2 -- bz2 trunk_untouched:0.43s me: 4.5s (10.5x, -----) he: 6.7s (15.5x, -----) ca:10.4s (24.2x, -----) bz2 fixes :0.43s me: 4.5s (10.5x, -0.2%) he: 6.7s (15.5x, -0.2%) ca:10.1s (23.4x, 3.3%) -- fbench -- fbench trunk_untouched:0.14s me: 2.8s (19.6x, -----) he: 1.9s (13.4x, -----) ca: 4.0s (28.2x, -----) fbench fixes :0.14s me: 2.8s (19.9x, -1.1%) he: 2.0s (14.6x, -8.5%) ca: 3.9s (28.1x, 0.3%) -- ffbench -- ffbench trunk_untouched:0.15s me: 2.6s (17.1x, -----) he: 3.4s (22.5x, -----) ca: 1.5s (10.1x, -----) ffbench fixes :0.15s me: 2.6s (17.3x, -0.8%) he: 3.1s (20.8x, 7.4%) ca: 1.5s ( 9.9x, 2.0%) -- heap -- heap trunk_untouched:0.05s me: 3.6s (72.6x, -----) he: 5.0s (99.4x, -----) ca: 4.9s (98.4x, -----) heap fixes :0.05s me: 3.7s (73.6x, -1.4%) he: 5.1s (102.4x, -3.0%) ca: 4.8s (95.2x, 3.3%) -- heap_pdb4 -- heap_pdb4 trunk_untouched:0.06s me: 5.9s (98.0x, -----) he: 5.6s (94.0x, -----) ca: 5.2s (86.8x, -----) heap_pdb4 fixes :0.06s me: 5.8s (96.0x, 2.0%) he: 5.7s (94.8x, -0.9%) ca: 5.2s (87.3x, -0.6%) -- many-loss-records -- many-loss-records trunk_untouched:0.01s me: 1.0s (101.0x, -----) he: 0.8s (85.0x, -----) ca: 0.8s (76.0x, -----) many-loss-records fixes :0.01s me: 1.0s (100.0x, 1.0%) he: 0.9s (87.0x, -2.4%) ca: 0.8s (77.0x, -1.3%) -- many-xpts -- many-xpts trunk_untouched:0.03s me: 1.2s (38.7x, -----) he: 1.4s (45.3x, -----) ca: 1.9s (62.7x, -----) many-xpts fixes :0.03s me: 1.1s (37.0x, 4.3%) he: 1.4s (47.0x, -3.7%) ca: 1.8s (61.3x, 2.1%) -- memrw -- memrw trunk_untouched:0.04s me: 0.9s (22.0x, -----) he: 2.3s (58.2x, -----) ca: 1.9s (46.5x, -----) memrw fixes :0.04s me: 0.9s (21.8x, 1.1%) he: 2.3s (58.2x, 0.0%) ca: 1.9s (47.2x, -1.6%) -- sarp -- sarp trunk_untouched:0.02s me: 1.5s (76.5x, -----) he: 3.4s (167.5x, -----) ca: 1.3s (63.0x, -----) sarp fixes :0.02s me: 1.6s (79.5x, -3.9%) he: 4.0s (200.5x,-19.7%) ca: 1.3s (65.5x, -4.0%) -- tinycc -- tinycc trunk_untouched:0.10s me: 6.6s (66.3x, -----) he: 6.6s (66.2x, -----) ca: 7.2s (72.4x, -----) tinycc fixes :0.10s me: 6.6s (66.1x, 0.3%) he: 6.8s (68.1x, -2.9%) ca: 7.2s (72.2x, 0.3%) -- Finished tests in perf ---------------------------------------------- == 12 programs, 72 timings ================= Diff: --- coregrind/m_debuglog.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/coregrind/m_debuglog.c b/coregrind/m_debuglog.c index bb9aa1b..7e8b59f 100644 --- a/coregrind/m_debuglog.c +++ b/coregrind/m_debuglog.c @@ -1203,9 +1203,6 @@ void VG_(debugLog) ( Int level, const HChar* modulename, if (level > loglevel) return; - indent = 2*level - 1; - if (indent < 1) indent = 1; - buf.n = 0; buf.buf[0] = 0; pid = local_sys_getpid(); @@ -1223,6 +1220,8 @@ void VG_(debugLog) ( Int level, const HChar* modulename, (void)myvprintf_int64 ( add_to_buf, &buf, 0, 10, 1, False, (ULong)level ); (void)myvprintf_str ( add_to_buf, &buf, 0, 1, ":", False ); (void)myvprintf_str ( add_to_buf, &buf, 0, 8, modulename, False ); + indent = 2*level - 1; + if (indent < 1) indent = 1; (void)myvprintf_str ( add_to_buf, &buf, 0, indent, "", False ); va_start(vargs,format); |
|
From: Michael M. <mos...@gm...> - 2017-11-16 04:59:07
|
Hi,
I have a custom memory allocator that needs to change a header in free
function, so I am disabling error reporting with
VALGRIND_DISABLE_ADDR_ERROR_REPORTING_IN_RANGE;
However the comparison right after that reports gives the following message
==8374== Conditional jump or move depends on uninitialised value(s)
Why is that the case?
(valgrind 3.13.0, x86_64 )
VALGRIND_DISABLE_ADDR_ERROR_REPORTING_IN_RANGE( pItem,
sizeof(ItemInPagePH) );
if (pItem->magic() == MEMORY_POOL_MAGIC_VALUE)
{
}
|