https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101147
Bug ID: 101147
Summary: [GCOV] Wrong coverage with label inside "while" loop
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 <stdlib.h>
#include<stdio.h>
int x;
int main() {
int i = 0;
x = 0;
if (x) {
for (; i < 10; ++i) {
doit:
x = i;
}
}
if (!x)
goto doit;
if (x != 9)
__builtin_abort();
return 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:91.67% of 12
Creating 'test.c.gcov'
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 1:#include <stdlib.h>
-: 2:#include<stdio.h>
-: 3:
-: 4:int x;
1: 5:int main() {
1: 6: int i = 0;
1: 7: x = 0;
1: 8: if (x) {
10*: 9: for (; i < 10; ++i) {
9: 10: doit:
10: 11: x = i;
-: 12: }
-: 13: }
2: 14: if (!x)
1: 15: goto doit;
1: 16: if (x != 9)
#####: 17: __builtin_abort();
1: 18: return 0;
-: 19:}
Coverage of line 9 should be same as line 10
