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From: "njuwy at smail dot nju.edu.cn" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/101487] New: [GCOV] Wrong coverage of "switch"
 inside "while" loop
Date: Sat, 17 Jul 2021 13:04:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101487

            Bug ID: 101487
           Summary: [GCOV] Wrong coverage of "switch" inside "while" loop
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: njuwy at smail dot nju.edu.cn
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

$ gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/usr/local/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto=
-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=3Drelease -enable-languages=
=3Dc,c++
-disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)=20

$ cat test.c
void foo(int x, int y) {
  while (x > 0)
    switch (({
      if (y)
        break;
      y;
    })) {
    case 2:
      x =3D 0;
    }
}

int main() {
  foo(1, 1);
  return 0;
}

$ gcc -O0 --coverage test.c;./a.out;gcov test;cat test.c.gcov
File 'test.c'
Lines executed:66.67% of 12
Creating 'test.c.gcov'

        -:    0:Source:test.c
        -:    0:Graph:test.gcno
        -:    0:Data:test.gcda
        -:    0:Runs:1
        1:    1:void foo(int x, int y) {
        1:    2:  while (x > 0)
    #####:    3:    switch (({
        1:    4:      if (y)
        1:    5:        break;
    #####:    6:      y;
        -:    7:    })) {
    #####:    8:    case 2:
    #####:    9:      x =3D 0;
        -:   10:    }
        1:   11:}
        -:   12:
        1:   13:int main() {
        1:   14:  foo(1, 1);
        1:   15:  return 0;
        -:   16:}


Line 3 was wrongly marked as unexecuted=