[llvm-bugs] [Bug 49483] New: [LLVM-COV] When the function pointer is used as a parameter, the coverage igoes wrong

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49483

            Bug ID: 49483
           Summary: [LLVM-COV] When the function pointer is used as a
                    parameter, the coverage igoes wrong
           Product: Runtime Libraries
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: libprofile library
          Assignee: unassignedbugs at nondot.org
          Reporter: cnwy1996 at outlook.com
                CC: llvm-bugs at lists.llvm.org

$ 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<stdio.h>
void free(void *ptr) {
printf("passed\n");
}

void *foo(void) {
printf("return\n");
return 0; 
}

int main(void) {
  void *p = foo();
  free(p);
  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
passed
return
passed
passed
passed
    1|       |#include<stdio.h>
    2|      2|void free(void *ptr) {
    3|      2|printf("passed\n");
    4|      2|}
    5|       |
    6|      1|void *foo(void) {
    7|      1|printf("return\n");
    8|      1|return 0; 
    9|      1|}
   10|       |
   11|      1|int main(void) {
   12|      1|  void *p = foo();
   13|      1|  free(p);
   14|      1|  return 0;
   15|      1|}

The result shows that function "free" was executed 4 times.

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