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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 [thread overview]
Message-ID: <bug-30278-4717-3wISiWyksP@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-30278-4717@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=30278
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 org
--- 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 expression:
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 = (void (*)()) 0x401106 <func_8>
gdb should be picking the last location in that list, because the
upper bound is exclusive, not inclusive. All those other entries
are dead.
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next prev parent reply other threads:[~2023-03-27 14:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-27 13:34 [Bug gdb/30278] New: " hluaw at connect dot ust.hk
2023-03-27 14:50 ` tromey at sourceware dot org [this message]
2023-03-27 14:59 ` [Bug gdb/30278] " tromey at sourceware dot org
2023-03-27 15:42 ` ssbssa at sourceware dot org
2023-03-27 20:48 ` tromey at sourceware dot org
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