https://bugs.llvm.org/show_bug.cgi?id=37083
Bug ID: 37083
Summary: [LLVM-COV] wrong coverage for a label pointed by a
static pointer in a static function
Product: Runtime Libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: libprofile library
Assignee: unassignedb...@nondot.org
Reporter: yangyib...@nju.edu.cn
CC: llvm-bugs@lists.llvm.org
$ cat small.c
#include <stdio.h>
static int doit(int x){
__label__ lbl1;
__label__ lbl2;
static int jtab_init = 0;
static void *jtab[2];
if(!jtab_init) {
jtab[0] = &&lbl1;
jtab[1] = &&lbl2;
jtab_init = 1;
}
if (jtab[x]==(&&lbl1))
printf("call doit(%d) *jtab[x] at lbl1\n", x);
if (jtab[x]==(&&lbl2))
printf("call doit(%d) *jtab[x] at lbl2\n", x);
goto *jtab[x];
lbl1:
return 1;
lbl2:
return 2;
}
int main(void){
doit(0);
doit(1);
return 0;
}
$ clang -O0 -g -fcoverage-mapping -fprofile-instr-generate=small.profraw
small.c; ./a.out; llvm-profdata merge small.profraw -o small.profdata; llvm-cov
show a.out -instr-profile=small.profdata small.c > small.gcov; cat small.gcov
call doit(0) *jtab[x] at lbl1
call doit(1) *jtab[x] at lbl2
1| |#include <stdio.h>
2| |
3| 2|static int doit(int x){
4| 2| __label__ lbl1;
5| 2| __label__ lbl2;
6| 2| static int jtab_init = 0;
7| 2| static void *jtab[2];
8| 2|
9| 2| if(!jtab_init) {
10| 1| jtab[0] = &&lbl1;
11| 1| jtab[1] = &&lbl2;
12| 1| jtab_init = 1;
13| 1| }
14| 2|
15| 2| if (jtab[x]==(&&lbl1))
16| 1| printf("call doit(%d) *jtab[x] at lbl1\n", x);
17| 2| if (jtab[x]==(&&lbl2))
18| 1| printf("call doit(%d) *jtab[x] at lbl2\n", x);
19| 2|
20| 2| goto *jtab[x];
21| 2|
22| 2|lbl1:
23| 1| return 1;
24| 1|lbl2:
25| 1| return 2;
26| 0|}
27| |
28| 1|int main(void){
29| 1| doit(0);
30| 1| doit(1);
31| 1|
32| 1| return 0;
33| 1|}
*****
Line #22 is wrongly marked as executed twice. However, from the output of the
program, a the second call to doit function. *jtab[x] is equal to lbl2,
therefore, Line #22 should be only executed once.
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