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<head>
<base href="https://bugs.llvm.org/">
</head>
<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] "assert" function in "else" structure has wrong coverage"
href="https://bugs.llvm.org/show_bug.cgi?id=51267">51267</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LLVM-COV] "assert" function in "else" structure has 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 <assert.h>
#include <stdio.h>
#include <string.h>
static inline __attribute__((__artificial__)) void *a(char *c, const char *d,
long n) {
return __builtin___memcpy_chk(c, d, n, __builtin_object_size(c, 0));
}
typedef struct {
char *data;
int len;
} sb_t;
const char __sb_slop[1];
static void inline set0(sb_t *c) {
if (c->data != __sb_slop)
c->data[0] = 0;
else
assert(c->data[0] == 0);
}
char buf[5];
sb_t l = {.data = buf, .len = 0};
void o() {
char *data = "abcd";
sb_t h = l;
set0(&h);
a(h.data, data, strlen(data));
printf("%s\n", h.data);
printf("%d\n", h.data == __sb_slop);
printf("%d\n", h.data == buf);
set0(&h);
}
int main(void) {
o();
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
abcd
0
1
1| |#include <assert.h>
2| |#include <stdio.h>
3| |#include <string.h>
4| |
5| |static inline __attribute__((__artificial__)) void *a(char *c,
const char *d,
6| 1| long n) {
7| 1| return __builtin___memcpy_chk(c, d, n, __builtin_object_size(c,
0));
8| 1|}
9| |typedef struct {
10| | char *data;
11| | int len;
12| |} sb_t;
13| |const char __sb_slop[1];
14| 2|static void inline set0(sb_t *c) {
15| 2| if (c->data != __sb_slop)
16| 2| c->data[0] = 0;
17| 2| else
18| 2|
19| 2| assert(c->data[0] == 0);
20| 2|}
21| |char buf[5];
22| |sb_t l = {.data = buf, .len = 0};
23| 1|void o() {
24| 1| char *data = "abcd";
25| 1| sb_t h = l;
26| 1| set0(&h);
27| 1| a(h.data, data, strlen(data));
28| 1| printf("%s\n", h.data);
29| 1| printf("%d\n", h.data == __sb_slop);
30| 1| printf("%d\n", h.data == buf);
31| 1| set0(&h);
32| 1|}
33| 1|int main(void) {
34| 1| o();
35| 1| return 0;
36| 1|}
Line 17 to 19 were not executed</pre>
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