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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [LLVM-COV] When the function pointer is used as a parameter, the coverage igoes wrong"
href="https://bugs.llvm.org/show_bug.cgi?id=49483">49483</a>
</td>
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<tr>
<th>Summary</th>
<td>[LLVM-COV] When the function pointer is used as a parameter, the coverage igoes wrong
</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>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>cnwy1996@outlook.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<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<stdio.h>
void free(void *ptr) {
printf("passed\n");
}
void *foo(void) {
printf("return\n");
return 0;
}
int main(void) {
void *p = foo();
free(p);
return 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
passed
return
passed
passed
passed
1| |#include<stdio.h>
2| 2|void free(void *ptr) {
3| 2|printf("passed\n");
4| 2|}
5| |
6| 1|void *foo(void) {
7| 1|printf("return\n");
8| 1|return 0;
9| 1|}
10| |
11| 1|int main(void) {
12| 1| void *p = foo();
13| 1| free(p);
14| 1| return 0;
15| 1|}
The result shows that function "free" was executed 4 times.</pre>
</div>
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