[llvm-bugs] [Bug 51023] New: [llvm-cov]

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51023

            Bug ID: 51023
           Summary: [llvm-cov]
           Product: Runtime Libraries
           Version: 12.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libprofile library
          Assignee: unassignedbugs at nondot.org
          Reporter: byone.heng at gmail.com
                CC: llvm-bugs at lists.llvm.org

$./clang -v                                                                     
clang version 12.0.0 (https://github.com/llvm/llvm-project.git
b6c8feb29fce39121884f7e08ec6eb0f58da3fb7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/x/project/llvm-project/build/install/bin/.
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
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
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$cat test.c
———————————————————

const volatile unsigned char true_var = 1;
static unsigned short int false_var = 0;

int a = 2, b, c, d;

int
foo ()
{
  for (;; c++)
    if ((b > 0) | (a & 1))
      ;
    else
      {
        d = a;
        return 0;
      }
}

int
main ()
{
  foo ();
  if (d != 2)
    __builtin_abort ();
  return 0;

——————————————————

$clang -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

    3|       |const volatile unsigned char true_var = 1;
    4|       |static unsigned short int false_var = 0;
    5|       |
    6|       |int a = 2, b, c, d;
    7|       |
    8|       |int
    9|       |foo ()
   10|      1|{
   11|      0|  for (;; c++)
   12|      1|    if ((b > 0) | (a & 1))
   13|      0|      ;
   14|      1|    else
   15|      1|   {
   16|      1|     d = a;
   17|      1|     return 0;
   18|      1|   }
   19|      1|}
   20|       |
   21|       |int
   22|       |main ()
   23|      1|{
   24|      1|  foo ();
   25|      1|  if (d != 2)
   26|      0|    __builtin_abort ();
   27|      1|  return 0;
   28|      1|}

Line 11 should be executed once.

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