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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] a for statement in the if statement has incorrect coverage"
href="https://bugs.llvm.org/show_bug.cgi?id=51007">51007</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[llvm-cov] a for statement in the if statement has incorrect coverage
</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
static volatile unsigned short int true_var = 1;
static const unsigned short int false_var = 0;
extern int strcmp(const char *, const char *);
extern char *strcpy(char *, const char *);
extern void abort(void);
extern void exit(int);
void *buf[20];
void __attribute__((noinline))
sub2 (void)
{
__builtin_longjmp (buf, 1);
}
int
main ()
{
char *p = (char *) __builtin_alloca (20);
strcpy (p, "test");
if (__builtin_setjmp (buf))
{
if (strcmp (p, "test") != 0)
abort ();
exit (0);
}
{
int *q = (int *) __builtin_alloca (p[2] * sizeof (int));
int i;
if( true_var > 0 )
{
for (i = 0; i < p[2]; i++)
q[i] = 0;
while (1)
sub2 ();
}
}
——————————————————
$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
4| |static volatile unsigned short int true_var = 1;
5| |static const unsigned short int false_var = 0;
6| |
7| |extern int strcmp(const char *, const char *);
8| |extern char *strcpy(char *, const char *);
9| |extern void abort(void);
10| |extern void exit(int);
11| |
12| |void *buf[20];
13| |
14| |void __attribute__((noinline))
15| |sub2 (void)
16| 1|{
17| 1| __builtin_longjmp (buf, 1);
18| 1|}
19| |
20| |int
21| |main ()
22| 1|{
23| 1| char *p = (char *) __builtin_alloca (20);
24| |
25| 1| strcpy (p, "test");
26| |
27| 1| if (__builtin_setjmp (buf))
28| 1| {
29| 1| if (strcmp (p, "test") != 0)
30| 0| abort ();
31| |
32| 1| exit (0);
33| 1| }
34| |
35| 0| {
36| 0| int *q = (int *) __builtin_alloca (p[2] * sizeof (int));
37| 0| int i;
38| |
39| 0| if( true_var > 0 )
40| 1| {
41| 116| for (i = 0; i < p[2]; i++)
42| 115| q[i] = 0;
43| |
44| 2| while (1)
45| 1| sub2 ();
46| 1| }
47| 0| }
48| 0|}
Line 36 and 37 were wrongly marked as unexecuted, and the coverage of line 41
should be 115.</pre>
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