https://bugs.llvm.org/show_bug.cgi?id=48264
Bug ID: 48264
Summary: llvm-cov: wrong code coverage for statements before
fork()
Product: Runtime Libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: libprofile library
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
$ cat test.c
int main()
{
int a = 1, c = 0;
c = c-a;
while(c>1)
{
c = c+a;
}
int pid = fork();
return 0;
}
$ clang -O0 -w -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.c.lcov; cat test.c.lcov
1| |int main()
2| 2|{
3| 2| int a = 1, c = 0;
4| 2| c = c-a;
5| 2| while(c>1)
6| 0| {
7| 0| c = c+a;
8| 0| }
9| 2| int pid = fork();
10| 2| return 0;
11| 2|}
##############
We can found that Line#3 and Line#4 are both wrongly marked as executed twice.
When debug this program in lldb, Line#3 and Line#4 only hit once.
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