https://bugs.llvm.org/show_bug.cgi?id=48263
Bug ID: 48263
Summary: llvm-cov: wrong code coverage when a label is in for
loop
Product: Runtime Libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: libprofile library
Assignee: unassignedb...@nondot.org
Reporter: yangyib...@hust.edu.cn
CC: llvm-bugs@lists.llvm.org
$ cat test.c
void foo()
{
int a = 0;
if (a < 0)
goto L1;
for (int c = 0; c < 3; c++)
L1:
a = a + 1;
printf("%d\n", a);
}
int main() { foo(); }
$ clang -O0 -w -fcoverage-mapping -fprofile-instr-generate=test.profraw test.c;
./a.out; llvm-profdata merge test.profraw -o test.profdata; llvm-cov show a.out
-instr-profile=test.profdata test.c > test.c.lcov; cat test.c.lcov
3
1| |void foo()
2| 1|{
3| 1| int a = 0;
4| 1| if (a < 0)
5| 0| goto L1;
6| 4| for (int c = 0; c < 3; c++)
7| 6| L1:
8| 6| a = a + 1;
9| 1|
10| 1| printf("%d\n", a);
11| 1|}
12| |
13| 1|int main() { foo(); }
#################
Line #6 is wrongly marked as executed 6 times. Actually, it only executed three
times since the finally value of 'a' is 3.
When debug this program in lldb, line 6 is only hit 3 times.
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