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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 - line coverage shows coverage of comments"
href="https://bugs.llvm.org/show_bug.cgi?id=45757">45757</a>
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<th>Summary</th>
<td>line coverage shows coverage of comments
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>hans@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk, vsk@apple.com
</td>
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<p>
<div>
<pre>For example:
$ cat /tmp/a.c
int f(int x) {
if (x == 42) {
// <a href="show_bug.cgi?id=45757#c1">Comment 1</a>.
return 1;
}
// <a href="show_bug.cgi?id=45757#c2">Comment 2</a>.
return 0;
}
int main() {
f(1);
return 0;
}
$ bin/clang -fcoverage-mapping -fprofile-instr-generate /tmp/a.c
$ ./a.out
$ bin/llvm-profdata merge default.profraw -o default.profdata
$ bin/llvm-cov show a.out -instr-profile=default.profdata
1| 1|int f(int x) {
2| 1| if (x == 42) {
3| 0| // <a href="show_bug.cgi?id=45757#c1">Comment 1</a>.
4| 0| return 1;
5| 0| }
6| 1| // <a href="show_bug.cgi?id=45757#c2">Comment 2</a>.
7| 1| return 0;
8| 1|}
9| |
10| 1|int main() {
11| 1| f(1);
12| 1| return 0;
13| 1|}
<a href="show_bug.cgi?id=45757#c1">Comment 1</a> gets an execution count of 0 (and shows on red background in the
console) but <a href="show_bug.cgi?id=45757#c2">Comment 2</a> is marked executed.
Does it make sense to have counters for comments, since they can't really be
executed?
(This was reported by Chromium's code coverage folks in
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=1074518">https://bugs.chromium.org/p/chromium/issues/detail?id=1074518</a>)
It seems gcc/gcov doesn't count the comment lines (gcc -fprofile-arcs
-ftest-coverage /tmp/a.c && ./a.out && gcov a.c && cat a.c.gcov).</pre>
</div>
</p>
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