[Bug middle-end/111505] [14 Regression] Asan (address-sanitizer) bootstrap fails since r14-4003-geaa8e8541349df

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111505

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Sergei Trofimovich <slyfox@gcc.gnu.org>:

https://gcc.gnu.org/g:7525707c5f3edb46958c4fdfbe30de5ddfa8923a

commit r14-4327-g7525707c5f3edb46958c4fdfbe30de5ddfa8923a
Author: Sergei Trofimovich <siarheit@google.com>
Date:   Thu Sep 28 20:20:31 2023 +0100

    ggc: do not wipe out unrelated data via gt_ggc_rtab [PR111505]

    There are 3 GC root tables:

       gt_ggc_rtab
       gt_ggc_deletable_rtab
       gt_pch_scalar_rtab

    `deletable` and `scalar` tables are both simple: each element always
    contains a pointer to the beginning of the object and it's size is the
    full object.

    `rtab` is different: it's `base` is a pointer in the middle of the
    struct and `stride` points to the next GC pointer in the array.

    Before the change there were 2 problems:

    1. We memset()ed not just pointers but data around them.
    2. We wen out of bounds of the last object described by gt_ggc_rtab
       and triggered bootstrap failures in profile and asan bootstraps.

    After the change we handle only pointers themselves like the rest of
    ggc-common.cc code.

    gcc/
            PR middle-end/111505
            * ggc-common.cc (ggc_zero_out_root_pointers, ggc_common_finalize):
            Add new helper. Use helper instead of memset() to wipe out
pointers.