coregrind/m_replacemalloc/replacemalloc_core.c

/*--------------------------------------------------------------------*/
/*--- Malloc replacement.                     replacemalloc_core.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2007 Julian Seward 
      jseward@acm.org

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307, USA.

   The GNU General Public License is contained in the file COPYING.
*/

#include "pub_core_basics.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcprint.h"
#include "pub_core_mallocfree.h"
#include "pub_core_options.h"
#include "pub_core_replacemalloc.h"

/*------------------------------------------------------------*/
/*--- Command line options                                 ---*/
/*------------------------------------------------------------*/

/* Nb: the allocator always rounds blocks up to a multiple of
   VG_MIN_MALLOC_SZB.
*/

/* DEBUG: print malloc details?  default: NO */
Bool VG_(clo_trace_malloc)  = False;

/* Minimum alignment in functions that don't specify alignment explicitly.
   default: 0, i.e. use VG_MIN_MALLOC_SZB. */
UInt VG_(clo_alignment)     = VG_MIN_MALLOC_SZB;


Bool VG_(replacement_malloc_process_cmd_line_option)(Char* arg)
{
   if (VG_CLO_STREQN(12, arg, "--alignment=")) {
      VG_(clo_alignment) = (UInt)VG_(atoll)(&arg[12]);

      if (VG_(clo_alignment) < VG_MIN_MALLOC_SZB
          || VG_(clo_alignment) > 4096
          || VG_(log2)( VG_(clo_alignment) ) == -1 /* not a power of 2 */) {
         VG_(message)(Vg_UserMsg, "");
         VG_(message)(Vg_UserMsg, 
            "Invalid --alignment= setting.  "
            "Should be a power of 2, >= %d, <= 4096.", VG_MIN_MALLOC_SZB);
         VG_(err_bad_option)("--alignment");
      }
   }

   else VG_BOOL_CLO(arg, "--trace-malloc",  VG_(clo_trace_malloc))
   else 
      return False;

   return True;
}

void VG_(replacement_malloc_print_usage)(void)
{
   VG_(printf)(
"    --alignment=<number>      set minimum alignment of allocations [%d]\n",
   VG_MIN_MALLOC_SZB
   );
}

void VG_(replacement_malloc_print_debug_usage)(void)
{
   VG_(printf)(
"    --trace-malloc=no|yes     show client malloc details? [no]\n"
   );
}

/*------------------------------------------------------------*/
/*--- Useful functions                                     ---*/
/*------------------------------------------------------------*/

void* VG_(cli_malloc) ( SizeT align, SizeT nbytes )                 
{                                                                             
   // 'align' should be valid (ie. big enough and a power of two) by now.
   // VG_(arena_memalign)() will abort if it's not.
   if (VG_MIN_MALLOC_SZB == align)
      return VG_(arena_malloc)   ( VG_AR_CLIENT, nbytes ); 
   else                                                                       
      return VG_(arena_memalign) ( VG_AR_CLIENT, align, nbytes );
}                                                                             

void VG_(cli_free) ( void* p )                                   
{                                                                             
   VG_(arena_free) ( VG_AR_CLIENT, p );                          
}

Bool VG_(addr_is_in_block)( Addr a, Addr start, SizeT size, SizeT rz_szB )
{
   return ( start - rz_szB <= a  &&  a < start + size + rz_szB );
}

/*--------------------------------------------------------------------*/
/*--- end                                                          ---*/
/*--------------------------------------------------------------------*/