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<head>
<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] wrong coverage for a for loop within "exit(0)" statement"
href="https://bugs.llvm.org/show_bug.cgi?id=51011">51011</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[llvm-cov] wrong coverage for a for loop within "exit(0)" statement
</td>
</tr>
<tr>
<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>byone.heng@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$./clang -v
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
b6c8feb29fce39121884f7e08ec6eb0f58da3fb7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/x/project/llvm-project/build/install/bin/.
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
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
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$cat test.c
———————————————————
unsigned int true_var = 1;
static const unsigned int false_var = 0;
extern void exit (int);
extern void abort (void);
volatile int a = 1;
volatile int b = 0;
volatile int x = 2;
volatile signed int r = 8;
void __attribute__((noinline))
foo (void)
{
exit (0);
}
int
main (void)
{
int si1 = a;
int si2 = b;
int i;
for (i = 0; i < 100; ++i) {
foo ();
if (x == 8)
i++;
r += i + si1 % si2;
}
abort ();
}
——————————————————
$clang -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| |
2| |unsigned int true_var = 1;
3| |static const unsigned int false_var = 0;
4| |extern void exit (int);
5| |extern void abort (void);
6| |
7| |volatile int a = 1;
8| |volatile int b = 0;
9| |volatile int x = 2;
10| |volatile signed int r = 8;
11| |
12| |void __attribute__((noinline))
13| |foo (void)
14| 1|{
15| 1| exit (0);
16| 1|}
17| |
18| |int
19| |main (void)
20| 1|{
21| 1| int si1 = a;
22| 1| int si2 = b;
23| 1| int i;
24| |
25| 2| for (i = 0; i < 100; ++i) {
26| 1| foo ();
27| 1| if (x == 8)
28| 0| i++;
29| 1| r += i + si1 % si2;
30| 1| }
31| 1| abort ();
32| 1|}
This bug is similar to <a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvm-cov] wrong coverage after executing exit(0) statement"
href="show_bug.cgi?id=51003">bug 51003</a>, I am not sure whether they belong to the same
bug.
Line 25 should be executed once. Line 27 and 29 should not be executed.</pre>
</div>
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