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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-cov: marco in if statement leads to wrong code coverage"
href="https://bugs.llvm.org/show_bug.cgi?id=48278">48278</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm-cov: marco in if statement leads to wrong code coverage
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>libprofile library
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yangyibiao@nju.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ cat test.c
#define MK(A) (A << 2)
int foo(int q)
{
if (q != MK(2))
return 0;
else
return 1;
}
void main()
{
int q = MK(2);
int r = foo(q);
printf("%d\n", r);
}
$ 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
1| 2|#define MK(A) (A << 2)
2| |
3| |int foo(int q)
4| 1|{
5| 1| if (q != MK(2))
6| 1| return 0;
7| 1| else
8| 1| return 1;
9| 1|}
10| |
11| |void main()
12| 1|{
13| 1| int q = MK(2);
14| 1| int r = foo(q);
15| 1| printf("%d\n", r);
16| 1|}
#################
Line #6 is wrongly marked as executed. When debug this program, Line#6 is not
hit by LLDB.
$ clang --version; llvm-cov --version
clang version 11.0.0 (/home/yibiao/.cache/yay/llvm-git/llvm-project
871beba234a83a2a02da9dedbd59b91a1bfbd7af)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
LLVM (<a href="http://llvm.org/">http://llvm.org/</a>):
LLVM version 11.0.0
Optimized build.
Default target: x86_64-pc-linux-gnu
Host CPU: skylake</pre>
</div>
</p>
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