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* [Bug gcov-profile/101192] New: [GCOV] The coverage of a callee function goes wrong.
@ 2021-06-24 11:58 njuwy at smail dot nju.edu.cn
2021-07-02 7:17 ` [Bug gcov-profile/101192] " marxin at gcc dot gnu.org
2021-08-13 10:36 ` njuwy at smail dot nju.edu.cn
0 siblings, 2 replies; 3+ messages in thread
From: njuwy at smail dot nju.edu.cn @ 2021-06-24 11:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101192
Bug ID: 101192
Summary: [GCOV] The coverage of a callee function goes wrong.
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: njuwy at smail dot nju.edu.cn
CC: marxin at gcc dot gnu.org
Target Milestone: ---
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=release -enable-languages=c,c++
-disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)
$ cat test.c
#include<stdio.h>
#include<stdlib.h>
char a[] = "12345";
char b[] = "12345";
void loop(char *pz, char *pzDta) {
for (;;) {
switch (*(pz++) = *(pzDta++)) {
case 0:
goto loopDone2;
case '"':
case '\\':
pz[-1] = '\\';
*(pz++) = pzDta[-1];
}
}
loopDone2:;
if (a - pz != b - pzDta)
abort();
}
int main() {
loop(a, b);
exit(0);
}
$ gcc -O0 --coverage test.c;./a.out;gcov test;cat test.c.gcov
libgcov profiling error:/home/wangyang/coverage/test/test.gcda:overwriting an
existing profile data with a different timestamp
File 'test.c'
Lines executed:71.43% of 14
Creating 'test.c.gcov'
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 1:#include<stdio.h>
-: 2:#include<stdlib.h>
-: 3:char a[] = "12345";
-: 4:char b[] = "12345";
-: 5:
6: 6:void loop(char *pz, char *pzDta) {
-: 7: for (;;) {
6: 8: switch (*(pz++) = *(pzDta++)) {
1: 9: case 0:
1: 10: goto loopDone2;
-: 11:
#####: 12: case '"':
-: 13: case '\\':
#####: 14: pz[-1] = '\\';
#####: 15: *(pz++) = pzDta[-1];
-: 16: }
-: 17: }
1: 18:loopDone2:;
-: 19:
1: 20: if (a - pz != b - pzDta)
#####: 21: abort();
1: 22:}
-: 23:
1: 24:int main() {
1: 25: loop(a, b);
1: 26: exit(0);
-: 27:}
Lets see line 6, "loop" function was only executed once.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/101192] [GCOV] The coverage of a callee function goes wrong.
2021-06-24 11:58 [Bug gcov-profile/101192] New: [GCOV] The coverage of a callee function goes wrong njuwy at smail dot nju.edu.cn
@ 2021-07-02 7:17 ` marxin at gcc dot gnu.org
2021-08-13 10:36 ` njuwy at smail dot nju.edu.cn
1 sibling, 0 replies; 3+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-07-02 7:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101192
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-07-02
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, we are unlucky as ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb is shared
in by the loop and function entry.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/101192] [GCOV] The coverage of a callee function goes wrong.
2021-06-24 11:58 [Bug gcov-profile/101192] New: [GCOV] The coverage of a callee function goes wrong njuwy at smail dot nju.edu.cn
2021-07-02 7:17 ` [Bug gcov-profile/101192] " marxin at gcc dot gnu.org
@ 2021-08-13 10:36 ` njuwy at smail dot nju.edu.cn
1 sibling, 0 replies; 3+ messages in thread
From: njuwy at smail dot nju.edu.cn @ 2021-08-13 10:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101192
--- Comment #2 from Yang Wang <njuwy at smail dot nju.edu.cn> ---
*** Bug 101623 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-08-13 10:36 UTC | newest]
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2021-06-24 11:58 [Bug gcov-profile/101192] New: [GCOV] The coverage of a callee function goes wrong njuwy at smail dot nju.edu.cn
2021-07-02 7:17 ` [Bug gcov-profile/101192] " marxin at gcc dot gnu.org
2021-08-13 10:36 ` njuwy at smail dot nju.edu.cn
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