mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-13 06:33:56 +00:00
9033020ae4
lots of the details changed. Made the following generalisations: - Recast everything to be entirely terms of bytes, instead of a mixture of (32-bit) words and bytes. This is a bit easier to understand, and made the following generalisations possible... - Almost 64-bit clean; no longer assuming 32-bit words/pointers. Only (I think) non-64-bit clean part is that VG_(malloc)() et al take an Int as the size arg, and size_t is 64-bits on 64-bit machines. - Made the alignment of blocks returned by malloc() et al completely controlled by a single value, VG_MIN_MALLOC_SZB. (Previously there were various magic numbers and assumptions about block alignment scattered throughout.) I tested this, all the regression tests pass with VG_MIN_MALLOC_SZB of 4, 8, 16, 32, 64. One thing required for this was to make redzones elastic; the asked-for redzone size is now the minimum size; it will use bigger ones if necessary to get the required alignment. Some other specific changes: - Made use of types a bit more; ie. actually using the type 'Block', rather than just having everything as arrays of words, so that should be a bit safer. - Removed the a->rz_check field, which was redundant wrt. a->clientmem. - Fixed up the decision about which list to use so the 4 lists which weren't ever being used now are -- the problem was that this hasn't been properly updated when alignment changed from 4 to 8 bytes. - Added a regression test for memalign() and posix_memalign(). memalign() was aborting if passed a bad alignment argument. - Added some high-level comments in various places, explaining how the damn thing works. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2579
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Default panicky definitions of template functions that tools ---*/
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/*--- should override. ---*/
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/*--- vg_defaults.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, an extensible x86 protected-mode
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emulator for monitoring program execution on x86-Unixes.
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Copyright (C) 2000-2004 Nicholas Nethercote
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njn25@cam.ac.uk
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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, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "vg_include.h"
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/* ---------------------------------------------------------------------
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Error messages (for malformed tools)
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------------------------------------------------------------------ */
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/* If the tool fails to define one or more of the required functions,
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* make it very clear what went wrong! */
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__attribute__ ((noreturn))
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void VG_(missing_tool_func) ( const Char* fn )
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{
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VG_(printf)(
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"\nTool error:\n"
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" The tool you have selected is missing the function `%s',\n"
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" which is required.\n\n",
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fn);
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VG_(skin_panic)("Missing tool function");
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}
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static __attribute__ ((noreturn))
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void malloc_panic ( const Char* fn )
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{
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VG_(printf)(
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"\nTool error:\n"
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" The tool you have selected is missing the function `%s'\n"
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" required because it is replacing malloc() et al.\n\n",
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fn);
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VG_(skin_panic)("Missing tool function");
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}
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/*------------------------------------------------------------*/
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/*--- Replacing malloc et al ---*/
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/*------------------------------------------------------------*/
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/* Default redzone size for CLIENT arena of Valgrind's malloc() */
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__attribute__ ((weak))
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UInt VG_(vg_malloc_redzone_szB) = 8;
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Bool VG_(sk_malloc_called_by_scheduler) = False;
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/* If the tool hasn't replaced malloc(), this one can be called from the
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scheduler, for the USERREQ__MALLOC user request used by vg_libpthread.c.
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(Nb: it cannot call glibc's malloc().) The lock variable ensures that the
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scheduler is the only place this can be called from; this ensures that a
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malloc()-replacing tool cannot forget to implement SK_(malloc)() or
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SK_(free)(). */
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__attribute__ ((weak))
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void* SK_(malloc)( Int size )
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{
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if (VG_(sk_malloc_called_by_scheduler))
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return VG_(cli_malloc)(VG_MIN_MALLOC_SZB, size);
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else
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malloc_panic(__PRETTY_FUNCTION__);
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}
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__attribute__ ((weak))
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void SK_(free)( void* p )
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{
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/* see comment for SK_(malloc)() above */
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if (VG_(sk_malloc_called_by_scheduler))
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VG_(cli_free)(p);
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else
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malloc_panic(__PRETTY_FUNCTION__);
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}
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/*--------------------------------------------------------------------*/
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/*--- end vg_defaults.c ---*/
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/*--------------------------------------------------------------------*/
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