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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] Using "setjmp" statement leads wrong coverage"
href="https://bugs.llvm.org/show_bug.cgi?id=50775">50775</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LLVM-COV] Using "setjmp" statement leads wrong coverage
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>11.0
</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>enhancement
</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>cnwy1996@outlook.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ clang -v
clang version 11.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/wangyang/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ cat test.c
#include <setjmp.h>
#include <stdlib.h>
jmp_buf env;
extern void sub(void);
int called;
__attribute__((__noinline__)) int sjtest() {
int i;
if (setjmp(env))
return 99;
for (i = 0; i < 10; i++)
sub();
printf("Executed!\n");
longjmp(env, 1);
}
__attribute__((__noinline__)) void sub(void) { called++; }
int main(void) {
if (sjtest() != 99 || called != 10)
abort();
exit(0);
}
$ clang -w -O0 -g -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.lcov; cat test.lcov
Executed!
1| |#include <setjmp.h>
2| |#include <stdlib.h>
3| |
4| |jmp_buf env;
5| |extern void sub(void);
6| |int called;
7| 1|__attribute__((__noinline__)) int sjtest() {
8| 1| int i;
9| 1| if (setjmp(env))
10| 1| return 99;
11| 0|
12| 10| for (i = 0; i < 10; i++)
13| 10| sub();
14| 0| printf("Executed!\n");
15| 0| longjmp(env, 1);
16| 0|}
17| |
18| 10|__attribute__((__noinline__)) void sub(void) { called++; }
19| |
20| |
21| 1|int main(void) {
22| 1| if (sjtest() != 99 || called != 10)
23| 0| abort();
24| 1| exit(0);
25| 1|}
We can see that line 14 and 15 were wrongly marked as unexecuted, and the
coverage of line 12 should be 11.</pre>
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