[LLVM-COV] Wrong coverage with "abort" function

[llvmbot]

Bugzilla Link	49438
Version	11.0
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

$ 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
extern void abort(void);

#define f(x) x

int main() {
#if f(1) == f // (// 1 //)
int x;
#endif
x = 0;
while(x<2){
if (f
// (
// 0 //
/**/))
abort();
x++;
}
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
1| |extern void abort(void);
2| |
3| 4|#define f(x) x
4| |
5| 1|int main() {
6| 1|#if f(1) == f // (// 1 //)
7| 1| int x;
8| 1|#endif
9| 1| x = 0;
10| 3| while(x<2){
11| 2| if (f
12| 2| // (
13| 2| // 0 //
14| 2| /**/))
15| 2| abort();
16| 2| x++;
17| 2|}
18| 1| return 0;
19| 1|}

Line #​15 should not be executed

[NJUocean]

In 14, the coverage is correct with the same commands.

    1|       |extern void abort(void);
    2|       |
    3|      4|#define f(x) x
    4|       |
    5|      1|int main() {
    6|      1|#if f(1) == f /**/ (/**/ 1 /**/)
    7|      1|  int x;
    8|      1|#endif
    9|      1|  x = 0;
   10|      3|  while(x<2){
   11|      2|  if (f
   12|      2|      /**/ (
   13|      2|          /**/ 0 /**/
   14|      2|          /**/))
   15|      0|    abort();
   16|      2|  x++;
   17|      2|}
   18|      1|  return 0;
   19|      1|}