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      1 
      2 /*--------------------------------------------------------------------*/
      3 /*--- Malloc replacement.                     replacemalloc_core.c ---*/
      4 /*--------------------------------------------------------------------*/
      5 
      6 /*
      7    This file is part of Valgrind, a dynamic binary instrumentation
      8    framework.
      9 
     10    Copyright (C) 2000-2015 Julian Seward
     11       jseward (at) acm.org
     12 
     13    This program is free software; you can redistribute it and/or
     14    modify it under the terms of the GNU General Public License as
     15    published by the Free Software Foundation; either version 2 of the
     16    License, or (at your option) any later version.
     17 
     18    This program is distributed in the hope that it will be useful, but
     19    WITHOUT ANY WARRANTY; without even the implied warranty of
     20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     21    General Public License for more details.
     22 
     23    You should have received a copy of the GNU General Public License
     24    along with this program; if not, write to the Free Software
     25    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     26    02111-1307, USA.
     27 
     28    The GNU General Public License is contained in the file COPYING.
     29 */
     30 
     31 #include "pub_core_basics.h"
     32 #include "pub_core_libcbase.h"
     33 #include "pub_core_libcprint.h"
     34 #include "pub_core_libcassert.h"
     35 #include "pub_core_tooliface.h"       // VG_(needs)
     36 #include "pub_core_mallocfree.h"
     37 #include "pub_core_options.h"
     38 #include "pub_core_replacemalloc.h"
     39 
     40 /*------------------------------------------------------------*/
     41 /*--- Command line options                                 ---*/
     42 /*------------------------------------------------------------*/
     43 
     44 /* Nb: the allocator always rounds blocks up to a multiple of
     45    VG_MIN_MALLOC_SZB.
     46 */
     47 
     48 /* DEBUG: print malloc details?  default: NO */
     49 Bool VG_(clo_trace_malloc)  = False;
     50 
     51 /* Minimum alignment in functions that don't specify alignment explicitly.
     52    default: 0, i.e. use VG_MIN_MALLOC_SZB. */
     53 UInt VG_(clo_alignment)     = VG_MIN_MALLOC_SZB;
     54 
     55 
     56 Bool VG_(replacement_malloc_process_cmd_line_option)(const HChar* arg)
     57 {
     58    if VG_INT_CLO(arg, "--alignment", VG_(clo_alignment)) {
     59       if (VG_(clo_alignment) < VG_MIN_MALLOC_SZB ||
     60           VG_(clo_alignment) > 4096 ||
     61           VG_(log2)( VG_(clo_alignment) ) == -1 /* not a power of 2 */)
     62       {
     63          VG_(fmsg_bad_option)(arg,
     64             "Alignment must be a power of 2 in the range %d..4096.\n",
     65             VG_MIN_MALLOC_SZB);
     66       }
     67    }
     68 
     69    else if VG_BOOL_CLO(arg, "--trace-malloc",  VG_(clo_trace_malloc)) {}
     70    else
     71       return False;
     72 
     73    return True;
     74 }
     75 
     76 SizeT VG_(malloc_effective_client_redzone_size)(void)
     77 {
     78    vg_assert(VG_(needs).malloc_replacement);
     79 
     80    return VG_(arena_redzone_size)(VG_AR_CLIENT);
     81 }
     82 
     83 /*------------------------------------------------------------*/
     84 /*--- Useful functions                                     ---*/
     85 /*------------------------------------------------------------*/
     86 
     87 void* VG_(cli_malloc) ( SizeT align, SizeT nbytes )
     88 {
     89    // 'align' should be valid (ie. big enough and a power of two) by now.
     90    // VG_(arena_memalign)() will abort if it's not.
     91    if (VG_MIN_MALLOC_SZB == align)
     92       return VG_(arena_malloc)   ( VG_AR_CLIENT, "replacemalloc.cm.1",
     93                                    nbytes );
     94    else
     95       return VG_(arena_memalign) ( VG_AR_CLIENT, "replacemalloc.cm.2",
     96                                    align, nbytes );
     97 }
     98 
     99 void VG_(cli_free) ( void* p )
    100 {
    101    VG_(arena_free) ( VG_AR_CLIENT, p );
    102 }
    103 
    104 // Useful for querying user blocks.
    105 SizeT VG_(cli_malloc_usable_size) ( void* p )
    106 {
    107    return VG_(arena_malloc_usable_size)(VG_AR_CLIENT, p);
    108 }
    109 
    110 Bool VG_(addr_is_in_block)( Addr a, Addr start, SizeT size, SizeT rz_szB )
    111 {
    112    return ( start - rz_szB <= a  &&  a < start + size + rz_szB );
    113 }
    114 
    115 /*--------------------------------------------------------------------*/
    116 /*--- end                                                          ---*/
    117 /*--------------------------------------------------------------------*/
    118