mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
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50bded71b2
Adds a new warning to memcheck when realloc is used with a size of 0. For a long time this has been "implementation defined" and so non-portable. With C23 it will become UB. Also adds a switch to turn off the error generation and a second switch to select between the most common "implementation" behaviours. The defaults for this second switch are baked in at build time.
88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Malloc replacement. pub_tool_replacemalloc.h ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2017 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef __PUB_TOOL_REPLACEMALLOC_H
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#define __PUB_TOOL_REPLACEMALLOC_H
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#include "pub_tool_basics.h" // Addr
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/* If a tool replaces malloc() et al, the easiest way to do so is to
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link libreplacemalloc_toolpreload.o into its vgpreload_*.so file, and
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use the functions declared below. You can do it from scratch,
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though, if you enjoy that sort of thing. */
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/* Can be called from VG_(tdict).malloc_malloc et al to do the actual
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* alloc/freeing. */
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extern void* VG_(cli_malloc) ( SizeT align, SizeT nbytes );
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extern void* VG_(cli_realloc)( void* ptr, SizeT nbytes );
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extern void VG_(cli_free) ( void* p );
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// Returns the usable size of a heap-block. It's the asked-for size plus
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// possibly some more due to rounding up.
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extern SizeT VG_(cli_malloc_usable_size)( void* p );
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/* If a tool uses deferred freeing (e.g. memcheck to catch accesses to
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freed memory) it can maintain number and total size of queued blocks
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in these variable to provide more accurate statistics about client
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memory usage. Currently used by mallinfo(). */
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extern Long VG_(free_queue_volume);
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extern Long VG_(free_queue_length);
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/* Check if an address is within a range, allowing for redzones at edges */
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extern Bool VG_(addr_is_in_block)( Addr a, Addr start,
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SizeT size, SizeT rz_szB );
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/* ------------------------------------------------------------------ */
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/* Some options that can be used by a tool if malloc() et al are replaced.
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The tool should call the functions in the appropriate places to give
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control over these aspects of Valgrind's version of malloc(). */
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/* DEBUG: print malloc details? default: NO */
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extern Bool VG_(clo_trace_malloc);
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/* Minimum alignment in functions that don't specify alignment explicitly.
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default: VG_MIN_MALLOC_SZB */
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extern UInt VG_(clo_alignment);
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/* Controls the behaviour of realloc(ptr, 0) */
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extern Bool VG_(clo_realloc_zero_bytes_frees);
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extern Bool VG_(replacement_malloc_process_cmd_line_option) ( const HChar* arg );
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// If tool is replacing malloc for the client, the below returns
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// the effective client redzone as derived from the default
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// provided by the tool, VG_(clo_redzone_size) and the minimum
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// redzone required by m_mallocfree.c.
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// It is an error to call this before VG_(needs_malloc_replacement) has
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// been called.
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extern SizeT VG_(malloc_effective_client_redzone_size)(void);
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#endif // __PUB_TOOL_REPLACEMALLOC_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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