[llvm-bugs] [Bug 38065] New: Wrong line hit counts for a single-line function

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38065

            Bug ID: 38065
           Summary: Wrong line hit counts for a single-line function
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: mcastelluccio at mozilla.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20522
  --> https://bugs.llvm.org/attachment.cgi?id=20522&action=edit
Archive with GCNO, GCDA, source file and GCOV output

clang --coverage -fno-exceptions -O0 main.c
./a.out
llvm-cov gcov main.gcda

The result is:
        -:    0:Source:main.c
        -:    0:Graph:main.gcno
        -:    0:Data:main.gcda
        -:    0:Runs:1
        -:    0:Programs:1
        3:    1:void f(int K) { if (K) {} }
        -:    2:
        -:    3:int main(void)
        -:    4:{
        1:    5:  f(5);
        -:    6:
        1:    7:  return 0;
        -:    8:}

Or with llvm-cov gcov -a -b -c main.gcda:
        -:    0:Source:main.c
        -:    0:Graph:main.gcno
        -:    0:Data:main.gcda
        -:    0:Runs:1
        -:    0:Programs:1
function f called 1 returned 100% blocks executed 100%
        1:    1:void f(int K) { if (K) {} }
        1:    1-block  0
branch  0 taken 1
branch  1 taken 0
        1:    1-block  1
        1:    1-block  2
        -:    2:
function main called 1 returned 100% blocks executed 100%
        -:    3:int main(void)
        -:    4:{
        1:    5:  f(5);
        -:    6:
        1:    7:  return 0;
        1:    7-block  0
        -:    8:}

Clearly, f is only called once, so the count should be 1 and not 3.

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