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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30296] GDB showing <synthetic pointer> for struct members
 that are clearly not.
Date: Thu, 11 May 2023 21:48:20 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30296

--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D245f9db1fa8a=
355e9b18d0966fe20d6341e36813

commit 245f9db1fa8a355e9b18d0966fe20d6341e36813
Author: Tom Tromey <tom@tromey.com>
Date:   Thu Apr 20 15:47:41 2023 -0600

    Do not print <synthetic pointer> when piece is optimized out

    A user reported a bug where printing a certain array of integer types
    would result in the nonsensical:

    (gdb) p l_126
    $1 =3D {6639779683436459270, <synthetic pointer>, <synthetic pointer>,
<synthetic pointer>}

    I tracked this down to some issues in the DWARF expression code.
    First, check_pieced_synthetic_pointer did not account for the
    situation where a location expression does not describe all the bits
    of a value -- in this case it returned true, meaning there is a
    synthetic pointer, but in fact these bits are optimized out.  (It
    turns out this incorrect output had already been erroneously tested
    for as well.)

    Next, rw_pieced_value did not mark these bits as optimized-out,
    either.

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D30296

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