https://bugs.llvm.org/show_bug.cgi?id=50776
Bug ID: 50776
Summary: [LLVM-COV] The FALSE condition of "for" statement
results in wrong coverage
Product: Runtime Libraries
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: libprofile library
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
$ 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 <stdlib.h>
int main(void) {
unsigned int a;
unsigned char b;
for (a = 0, b = 2;
a > b;
a++)
{
printf("Inloop: %d\n",a);
}
printf("Outloop: %d\n",a);
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
Outloop: 0
1| |#include <stdlib.h>
2| |
3| 1|int main(void) {
4| 1| unsigned int a;
5| 1| unsigned char b;
6| 1| for (a = 0, b = 2;
7| 1| a > b;
8| 1| a++)
9| 0| {
10| 0| printf("Inloop: %d\n",a);
11| 0| }
12| 1| printf("Outloop: %d\n",a);
13| 1| return 0;
14| 1|}
Absolutely, line 8 was not executed.
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