From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 23F9D3858CDA; Thu,  6 Apr 2023 06:13:44 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 23F9D3858CDA
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org;
	s=default; t=1680761624;
	bh=0rn/SGeqBjJ86287fZzaSFKZJwrHTLfs9JvE2XronKs=;
	h=From:To:Subject:Date:From;
	b=OMZgTy2RX5w7C+CbbTgJ7njj8AB3IGORCwGWBYP4OTZbO2bivmzIn8p7GK3OWCFXd
	 osBgMTIhm8F6THP4wPGYsk4ced6hlrPzDP191KlxQfsx87LnLh0ykNn9xOPnEwdUpR
	 tCG9i/WiHsYiFGgAotH37X0Eohysu+3uJXWAov9g=
From: "hluaw at connect dot ust.hk" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30319] New: GDB shows "Incompatible DWARF Stack" when it's
 actually compatible
Date: Thu, 06 Apr 2023 06:13:43 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 13.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hluaw at connect dot ust.hk
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-30319-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gdb-prs.sourceware.org>

https://sourceware.org/bugzilla/show_bug.cgi?id=3D30319

            Bug ID: 30319
           Summary: GDB shows "Incompatible DWARF Stack" when it's
                    actually compatible
           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 =3D 9067;
volatile uint16_t *c =3D (volatile uint16_t*)&b;
int *d =3D &a;
int func_1() {
  uint16_t e[7][2][8];
  uint32_t f =3D 37455;
  int32_t l_146;
  a =3D 0;
  l_146 =3D *c * f;
  *d =3D e[3][1][5];
  return l_146;
}
int main() { func_1(); return 0; }

Compiled with clang 15.0.7 and -O1 -g.

For l_146, the following DWARF is generated.

(gdb) info addr l_146
Symbol "l_146" is multi-location:
  Range 0x555555554674-0x55555555467b: a complex DWARF expression:
     0: DW_OP_breg0 0 [$rax]
     2: DW_OP_constu 65535
     6: DW_OP_and
     7: DW_OP_convert<DW_ATE_unsigned_16 [0x27]>
    12: DW_OP_convert<DW_ATE_unsigned_32 [0x2b]>
    17: DW_OP_constu 37455
    21: DW_OP_mul
    22: DW_OP_stack_value
(gdb) p l_146
Incompatible types on DWARF stack

GDB complaining that this DWARF expression is invalid since on DW_OP_mul, b=
ut
this DWARF is in fact valid since it performs a explicit conversion, and
DW_OP_constu 37455 is automatically unsigned.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=