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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30278] gdb gives wrong value at -O1
Date: Mon, 27 Mar 2023 14:50:54 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30278

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-03-27
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |tromey at sourceware dot o=
rg

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I wrote a long thing here about how this is the compiler's fault,
but now I see there really is a gdb bug.

"i" has a location list:

(gdb) info addr i
Symbol "i" is multi-location:
  Base address 0x401106  Range 0x401106-0x401106: a complex DWARF expressio=
n:
     0: DW_OP_lit0
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit1
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit2
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit3
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit4
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit5
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit6
     1: DW_OP_stack_value

  Range 0x401106-0x401106: a complex DWARF expression:
     0: DW_OP_lit7
     1: DW_OP_stack_value

  Range 0x401106-0x401116: a complex DWARF expression:
     0: DW_OP_lit8
     1: DW_OP_stack_value


And the PC is:

(gdb) p $pc
$2 =3D (void (*)()) 0x401106 <func_8>

gdb should be picking the last location in that list, because the=20
upper bound is exclusive, not inclusive.  All those other entries
are dead.

--=20
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