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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] Dead code after goto statement was wrongly marked as executed"
href="https://bugs.llvm.org/show_bug.cgi?id=49426">49426</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LLVM-COV] Dead code after goto statement was wrongly marked as executed
</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>
<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
extern void abort(void);
extern void exit(int);
int sub1(int val) { return val; }
int testcond(int val) {
int flag1;
{
int t1 = val;
{
int t2 = t1;
{
flag1 = sub1(t2) == 0;
goto lab1;
t2++;
};
}
lab1:;
}
if (flag1 != 0)
return 0x4d0000;
else
return 0;
}
int main(void) {
if (testcond(1))
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
1| |extern void abort(void);
2| |extern void exit(int);
3| |
4| 1|int sub1(int val) { return val; }
5| |
6| 1|int testcond(int val) {
7| 1| int flag1;
8| 1|
9| 1| {
10| 1| int t1 = val;
11| 1| {
12| 1| int t2 = t1;
13| 1| {
14| 1| flag1 = sub1(t2) == 0;
15| 1| goto lab1;
16| 1| t2++;
17| 0| };
18| 0| }
19| 1| lab1:;
20| 1| }
21| 1|
22| 1| if (flag1 != 0)
23| 0| return 0x4d0000;
24| 1| else
25| 1| return 0;
26| 1|}
27| |
28| 1|int main(void) {
29| 1| if (testcond(1))
30| 0| abort();
31| 1| exit(0);
32| 1|}
Line #16 should never be excuted.</pre>
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