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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug testsuite/29813] [gdb/testsuite, powerpc64le] FAIL:
 gdb.base/vla-optimized-out.exp: o1: printed size of optimized out vla
Date: Mon, 21 Nov 2022 12:56:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29813

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> I suppose the following happens.  The DW_OP_GNU_entry_value needs to be
> evaluated, and gdb looks for a call site matching this pc:
> ...
> (gdb) up
> #1  0x0000000010000690 in main () at
> gdb/testsuite/gdb.base/vla-optimized-out.c:42
> 42        j =3D f1 (i);
> (gdb)
> ...
>=20
> There is a call site here:
> ...
>  <2><f6>: Abbrev Number: 5 (DW_TAG_GNU_call_site)
>     <f7>   DW_AT_low_pc      : 0x10000694
>     <ff>   DW_AT_abstract_origin: <0x110>
> ...
> which is not matched because it's 0x4 off.

That seems to be indeed the case:
...
(gdb) up
#1  0x00000000114d2d28 in throw_it (reason=3DRETURN_ERROR,
error=3DNO_ENTRY_VALUE_ERROR,=20
    fmt=3D0x11597848 "DW_OP_entry_value resolving cannot find DW_TAG_call_s=
ite %s
in %s",=20
    ap=3D0x7fffffffc6a0 "\244\006m\022")
    at /suse/tdevries/gdb/src/gdbsupport/common-exceptions.cc:200
...

BTW, looking at the gcc sources, the bl;nop in call_value_nonlocal_aix<mode>
disappears in gcc-9-branch.

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