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From: "hluaw at connect dot ust.hk" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30318] New: GDB showing outdate value even though DWARF has
 a new value.
Date: Thu, 06 Apr 2023 03:03:32 +0000
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X-Bugzilla-Component: gdb
X-Bugzilla-Version: 13.1
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30318

            Bug ID: 30318
           Summary: GDB showing outdate value even though DWARF has a new
                    value.
           Product: gdb
           Version: 13.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: hluaw at connect dot ust.hk
  Target Milestone: ---

Given the following code:
#include "stdint.h"
int a, b;
int func_17() {
  int32_t *l_26 =3D 0;
  int32_t **c =3D &l_26;
  *c =3D &a;
  b =3D 0;
  return a;
}
int main() { func_17(); }

Compiled with gcc 12.2.0 with -O2 and -g

For l_26 the DWARF says:
(gdb) info addr l_26
Symbol "l_26" is multi-location:
  Base address 0x401020  Range 0x401020-0x401020: the constant 0
  Range 0x401020-0x40102a: a complex DWARF expression:
     0: DW_OP_addr 0x404030
     9: DW_OP_stack_value
(gdb) p $pc
$2 =3D (void (*)()) 0x401020 <main>
(gdb) p l_26
$3 =3D (int32_t *) 0x0

Though $pc is at the inclusive beginning of a valid range, gdb still says i=
t's
zero.

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