[llvm-bugs] [Bug 46009] New: Wrong line information at Og

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46009

            Bug ID: 46009
           Summary: Wrong line information at Og
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: DebugInfo
          Assignee: unassignedbugs at nondot.org
          Reporter: massarelli at diag.uniroma1.it
                CC: ditaliano at apple.com, jdevlieghere at apple.com,
                    keith.walker at arm.com, llvm-bugs at lists.llvm.org,
                    paul_robinson at playstation.sony.com

Line 8 should not be hit.

$ cat a.c
int a,  b,  c ;
int main ()
{
    {int ui1 = 5,  ui2 = b;
       c =  
          ui2 == 0 ? 
          ui1 : 
          (ui1 / ui2); 
     }
}

$ clang -v
clang version 11.0.0 (https://github.com/llvm/llvm-project.git
268fa40daa151d3b4bff1df12b62e5dae94685d7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
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
Selected multilib: .;@m64

$ lldb -v

$ lldb opt 
(lldb) target create "opt"
Current executable set to 'opt' (x86_64).
(lldb) b main
Breakpoint 1: where = opt`main at a.c:4:26, address = 0x0000000000400480
(lldb) r
Process 65 launched: 'opt' (x86_64)
Process 65 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.1
    frame #0: 0x0000000000400480 opt`main at a.c:4:26
   1    int a,  b,  c ;
   2    int main ()
   3    {
-> 4        {int ui1 = 5,  ui2 = b;
   5           c =  
   6              ui2 == 0 ? 
   7              ui1 : 
(lldb) s
Process 65 stopped
* thread #1, name = 'opt', stop reason = step in
    frame #0: 0x0000000000400486 opt`main at a.c:8:16
   5           c =  
   6              ui2 == 0 ? 
   7              ui1 : 
-> 8              (ui1 / ui2); 
   9         }
   10   }
(lldb) di
opt`main:
    0x400480 <+0>:  movl   0x200ba6(%rip), %ecx      ; b
->  0x400486 <+6>:  movl   $0x5, %eax
    0x40048b <+11>: testl  %ecx, %ecx
    0x40048d <+13>: je     0x400493                  ; <+19> at a.c:5:10
    0x40048f <+15>: xorl   %edx, %edx
    0x400491 <+17>: idivl  %ecx
    0x400493 <+19>: movl   %eax, 0x200b97(%rip)      ; c
    0x400499 <+25>: xorl   %eax, %eax
    0x40049b <+27>: retq   
(lldb) s
Process 65 stopped
* thread #1, name = 'opt', stop reason = step in
    frame #0: 0x000000000040048b opt`main at a.c:6:15
   3    {
   4        {int ui1 = 5,  ui2 = b;
   5           c =  
-> 6              ui2 == 0 ? 
   7              ui1 : 
   8              (ui1 / ui2); 
   9         }
(lldb) s
Process 65 stopped
* thread #1, name = 'opt', stop reason = step in
    frame #0: 0x0000000000400493 opt`main at a.c:5:10
   2    int main ()
   3    {
   4        {int ui1 = 5,  ui2 = b;
-> 5           c =  
   6              ui2 == 0 ? 
   7              ui1 : 
   8              (ui1 / ui2); 
(lldb) s
Process 65 stopped
* thread #1, name = 'opt', stop reason = step in
    frame #0: 0x0000000000400499 opt`main at a.c:10:1
   7              ui1 : 
   8              (ui1 / ui2); 
   9         }
-> 10   }

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