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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 for statements before fork()"
href="https://bugs.llvm.org/show_bug.cgi?id=48264">48264</a>
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<th>Summary</th>
<td>llvm-cov: wrong code coverage for statements before fork()
</td>
</tr>
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<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>libprofile library
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<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
int main()
{
int a = 1, c = 0;
c = c-a;
while(c>1)
{
c = c+a;
}
int pid = fork();
return 0;
}
$ 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
1| |int main()
2| 2|{
3| 2| int a = 1, c = 0;
4| 2| c = c-a;
5| 2| while(c>1)
6| 0| {
7| 0| c = c+a;
8| 0| }
9| 2| int pid = fork();
10| 2| return 0;
11| 2|}
##############
We can found that Line#3 and Line#4 are both wrongly marked as executed twice.
When debug this program in lldb, Line#3 and Line#4 only hit once.</pre>
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