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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-cov: wrong code coverage when a label is in for loop"
href="https://bugs.llvm.org/show_bug.cgi?id=48263">48263</a>
</td>
</tr>
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<th>Summary</th>
<td>llvm-cov: wrong code coverage when a label is in for loop
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>libprofile library
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yangyibiao@hust.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ 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.</pre>
</div>
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