[llvm-bugs] [Bug 51512] New: Wrong line information at Og

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51512

            Bug ID: 51512
           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: artuso at diag.uniroma1.it
                CC: jdevlieghere at apple.com, keith.walker at arm.com,
                    llvm-bugs at lists.llvm.org,
                    paul_robinson at playstation.sony.com

Comment:
Step at variable declaration (line 6).

Steps to reproduce bug:

root at 5cd8c077ddd7:/home/stepping/output# clang -v
clang version 14.0.0 (https://github.com/llvm/llvm-project.git
957334382cd12ec07b46c0ddfdcc220731f6d80f)
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

root at 5cd8c077ddd7:/home/stepping/output# lldb -v
lldb version 14.0.0 (https://github.com/llvm/llvm-project.git revision
957334382cd12ec07b46c0ddfdcc220731f6d80f)
  clang revision 957334382cd12ec07b46c0ddfdcc220731f6d80f
  llvm revision 957334382cd12ec07b46c0ddfdcc220731f6d80f

root at 5cd8c077ddd7:/home/stepping/output# cat a.c
int a, c, e, f;
static int *b = &a;
short d = 6;
void func_15() {
  for (; c >= 0; c--) {
    int i, j;
    *b = f;
  }
}
int main() {
  func_15();
  for (; d <= 0;) {
    int g[4];
    g[e] = &b;
  }
}
root at 5cd8c077ddd7:/home/stepping/output# cat -n a.c
     1  int a, c, e, f;
     2  static int *b = &a;
     3  short d = 6;
     4  void func_15() {
     5    for (; c >= 0; c--) {
     6      int i, j;
     7      *b = f;
     8    }
     9  }
    10  int main() {
    11    func_15();
    12    for (; d <= 0;) {
    13      int g[4];
    14      g[e] = &b;
    15    }
    16  }

root at 5cd8c077ddd7:/home/stepping/output# clang -g -Og a.c -o opt
a.c:14:10: warning: incompatible pointer to integer conversion assigning to
'int' from 'int **' [-Wint-conversion]
    g[e] = &b;
         ^ ~~
1 warning generated.

root at 5cd8c077ddd7:/home/stepping/output# lldb opt
(lldb) target create "opt"
Current executable set to '/home/stepping/output/opt' (x86_64).
(lldb) b 6
Breakpoint 1: 2 locations.
(lldb) r
Process 38586 launched: '/home/stepping/output/opt' (x86_64)
Process 38586 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.2
    frame #0: 0x00000000004004e0 opt`main [inlined] func_15 at a.c:6:9
   3    short d = 6;
   4    void func_15() {
   5      for (; c >= 0; c--) {
-> 6        int i, j;
   7        *b = f;
   8      }
   9    }
(lldb) di -l
opt`main:
->  0x4004e0 <+32>: movl   %ecx, %edx

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