[lldb-dev] [Bug 45609] New: lldb wrongly stopped at abort() function within a nested for loop

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=45609

            Bug ID: 45609
           Summary: lldb wrongly stopped at abort() function within a
                    nested for loop
           Product: lldb
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: yangyibiao at hust.edu.cn
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

$ lldb --version
lldb version 9.0.1



$ clang -g small.c; lldb ./a.out
(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) b small.c:5
Breakpoint 1: where = a.out`main + 49 at small.c:5:12, address =
0x0000000000001171
(lldb) run
Process 45684 launched: '/home/yibiao/cv-gcov/a.out' (x86_64)
Process 45684 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
    frame #0: 0x0000555555555171 a.out`main at small.c:5:12
   2    {
   3      for (int x = 1; x < 2; x++)
   4        for (int y = -1; y <= 0; y++)
-> 5          if ((x - y) != (x - y))
   6            __builtin_abort ();
   7      return 0;
   8    }
(lldb) step
Process 45684 stopped
* thread #1, name = 'a.out', stop reason = step in
    frame #0: 0x000055555555518f a.out`main at small.c:4:31
   1    int main ()
   2    {
   3      for (int x = 1; x < 2; x++)
-> 4        for (int y = -1; y <= 0; y++)
   5          if ((x - y) != (x - y))
   6            __builtin_abort ();
   7      return 0;
(lldb) step
Process 45684 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
    frame #0: 0x0000555555555171 a.out`main at small.c:5:12
   2    {
   3      for (int x = 1; x < 2; x++)
   4        for (int y = -1; y <= 0; y++)
-> 5          if ((x - y) != (x - y))
   6            __builtin_abort ();
   7      return 0;
   8    }
(lldb) step
Process 45684 stopped
* thread #1, name = 'a.out', stop reason = step in
    frame #0: 0x000055555555518f a.out`main at small.c:4:31
   1    int main ()
   2    {
   3      for (int x = 1; x < 2; x++)
-> 4        for (int y = -1; y <= 0; y++)
   5          if ((x - y) != (x - y))
   6            __builtin_abort ();
   7      return 0;
(lldb) step
Process 45684 stopped
* thread #1, name = 'a.out', stop reason = step in
    frame #0: 0x000055555555519d a.out`main at small.c:6:25
   3      for (int x = 1; x < 2; x++)
   4        for (int y = -1; y <= 0; y++)
   5          if ((x - y) != (x - y))
-> 6            __builtin_abort ();
   7      return 0;
   8    }



/***
In the last step, lldb stopped at __builtin_abort(); statement.
When we directly setting breakpoint at small.c:6, lld is not stopped as
follows:
***/


$ lldb ./a.out
(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) b small.c:6
Breakpoint 1: where = a.out`main + 69 at small.c:6:8, address =
0x0000000000001185
(lldb) run
Process 45740 launched: '/home/yibiao/cv-gcov/a.out' (x86_64)
Process 45740 exited with status = 0 (0x00000000)


$ cat small.c
int main ()
{
  for (int x = 1; x < 2; x++)
    for (int y = -1; y <= 0; y++)
      if ((x - y) != (x - y))
        __builtin_abort ();
  return 0;
}

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