[llvm-bugs] [Bug 35495] New: [LLVM-COV] statement inside a label after a non-executed statement is wrongly marked as non executed in llvm-cov

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35495

            Bug ID: 35495
           Summary: [LLVM-COV] statement inside a label after a
                    non-executed statement is wrongly marked as non
                    executed in llvm-cov
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yangyibiao at nju.edu.cn
                CC: llvm-bugs at lists.llvm.org

$ clang -v
clang version 6.0.0-svn319460-1~exp1 (trunk)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.1
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.2.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Candidate multilib: .;@m64
Selected multilib: .;@m64

$ cat small.c
void main()
{
    int v;
    if (1) 
        goto lbl;
    v = 0;
lbl:
    if (1) 
        ;
    v = 1;
}

$ clang -w -O0 -g -fcoverage-mapping -fprofile-instr-generate=small.profraw
small.c; ./a.out; llvm-profdata merge small.profraw -o small.profdata; llvm-cov
show a.out -instr-profile=small.profdata small.c > small.gcov

$ cat small.gcov
    1|       |void main()
    2|      1|{
    3|      1|    int v;
    4|      1|    if (1) 
    5|      1|        goto lbl;
    6|      0|    v = 0;
    7|      1|lbl:
    8|      1|    if (1) 
    9|      1|        ;
   10|      0|    v = 1;
   11|      0|}

We can find that Line #10 and Line #11 are wrongly marked as not executed. If
we delete Line #6 from small.c, the coverage information is correct.

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