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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: Regression: switch-case often leads to uncoverable regions"
href="https://bugs.llvm.org/show_bug.cgi?id=45300">45300</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm-cov: Regression: switch-case often leads to uncoverable regions
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dennis.felsing@sap.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ cat x.cpp
#include <iostream>
void f(int argc)
{
switch (argc) {
case 1: {
std::cout << "1" << std::endl;
return;
}
}
}
int main(int argc, char** /*argv*/)
{
f(argc);
f(argc+1);
}
$ clang++ --version
clang version 10.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -fprofile-instr-generate -fcoverage-mapping x.cpp -o x
$ ./x
1
$ llvm-profdata merge default.profraw -o default.profdata
$ llvm-cov show ./x -instr-profile=default.profdata
1| |#include <iostream>
2| |
3| |void f(int argc)
4| 2|{
5| 2| switch (argc) {
6| 1| case 1: {
7| 1| std::cout << "1" << std::endl;
8| 1| return;
9| 0| }
10| 2| }
11| 2|}
12| |
13| |int main(int argc, char** /*argv*/)
14| 1|{
15| 1| f(argc);
16| 1| f(argc+1);
17| 1|}
Note that line 9 is uncovered and impossible to cover.
With LLVM 9.0.0 this worked fine:
1| |#include <iostream>
2| |
3| |void f(int argc)
4| 2|{
5| 2| switch (argc) {
6| 2| case 1: {
7| 1| std::cout << "1" << std::endl;
8| 1| return;
9| 2| }
10| 2| }
11| 2|}
12| |
13| |int main(int argc, char** /*argv*/)
14| 1|{
15| 1| f(argc);
16| 1| f(argc+1);
17| 1|}
Best regards
Dennis</pre>
</div>
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