glibc/sysdeps/generic/set-freeres-system.h

/* System specific resource deallocation.  Generic version.
   Copyright (C) 2022 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

/* Each system may define weak functions to free any resource allocated with
   malloc to avoid interfere with mtrace.  */

#include <set-freeres-os.h>
#include <set-freeres-fp.h>

#define call_freeres_system_funcs	\
  call_freeres_os_funcs;		\
  call_freeres_fp_funcs
Move libc_freeres_ptrs and libc_subfreeres to hidden/weak functions They are both used by __libc_freeres to free all library malloc allocated resources to help tooling like mtrace or valgrind with memory leak tracking. The current scheme uses assembly markers and linker script entries to consolidate the free routine function pointers in the RELRO segment and to be freed buffers in BSS. This patch changes it to use specific free functions for libc_freeres_ptrs buffers and call the function pointer array directly with call_function_static_weak. It allows the removal of both the internal macros and the linker script sections. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> 2022-12-27 21:11:42 +00:00			`/* System specific resource deallocation. Generic version.`
			`Copyright (C) 2022 Free Software Foundation, Inc.`
			`This file is part of the GNU C Library.`

			`The GNU C Library is free software; you can redistribute it and/or`
			`modify it under the terms of the GNU Lesser General Public`
			`License as published by the Free Software Foundation; either`
			`version 2.1 of the License, or (at your option) any later version.`

			`The GNU C Library is distributed in the hope that it will be useful,`
			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
			`Lesser General Public License for more details.`

			`You should have received a copy of the GNU Lesser General Public`
			`License along with the GNU C Library; if not, see`
			`<https://www.gnu.org/licenses/>. */`

			`/* Each system may define weak functions to free any resource allocated with`
			`malloc to avoid interfere with mtrace. */`

			`#include <set-freeres-os.h>`
			`#include <set-freeres-fp.h>`

			`#define call_freeres_system_funcs \`
			`call_freeres_os_funcs; \`
			`call_freeres_fp_funcs`