replacemalloc_core.c revision 8f943afc22a6a683b78271836c8ddc462b4824a9 
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) 2000-2011 Julian Seward
11      jseward@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_mallocfree.h"
35#include "pub_core_options.h"
36#include "pub_core_replacemalloc.h"
37
38/*------------------------------------------------------------*/
39/*--- Command line options                                 ---*/
40/*------------------------------------------------------------*/
41
42/* Nb: the allocator always rounds blocks up to a multiple of
43   VG_MIN_MALLOC_SZB.
44*/
45
46/* DEBUG: print malloc details?  default: NO */
47Bool VG_(clo_trace_malloc)  = False;
48
49/* Minimum alignment in functions that don't specify alignment explicitly.
50   default: 0, i.e. use VG_MIN_MALLOC_SZB. */
51UInt VG_(clo_alignment)     = VG_MIN_MALLOC_SZB;
52
53
54Bool VG_(replacement_malloc_process_cmd_line_option)(Char* arg)
55{
56   if VG_INT_CLO(arg, "--alignment", VG_(clo_alignment)) {
57      if (VG_(clo_alignment) < VG_MIN_MALLOC_SZB ||
58          VG_(clo_alignment) > 4096 ||
59          VG_(log2)( VG_(clo_alignment) ) == -1 /* not a power of 2 */)
60      {
61         VG_(fmsg_bad_option)(arg,
62            "Alignment must be a power of 2 in the range %d..4096.\n",
63            VG_MIN_MALLOC_SZB);
64      }
65   }
66
67   else if VG_BOOL_CLO(arg, "--trace-malloc",  VG_(clo_trace_malloc)) {}
68   else
69      return False;
70
71   return True;
72}
73
74/*------------------------------------------------------------*/
75/*--- Useful functions                                     ---*/
76/*------------------------------------------------------------*/
77
78void* VG_(cli_malloc) ( SizeT align, SizeT nbytes )
79{
80   // 'align' should be valid (ie. big enough and a power of two) by now.
81   // VG_(arena_memalign)() will abort if it's not.
82   if (VG_MIN_MALLOC_SZB == align)
83      return VG_(arena_malloc)   ( VG_AR_CLIENT, "replacemalloc.cm.1",
84                                   nbytes );
85   else
86      return VG_(arena_memalign) ( VG_AR_CLIENT, "replacemalloc.cm.2",
87                                   align, nbytes );
88}
89
90void VG_(cli_free) ( void* p )
91{
92   VG_(arena_free) ( VG_AR_CLIENT, p );
93}
94
95Bool VG_(addr_is_in_block)( Addr a, Addr start, SizeT size, SizeT rz_szB )
96{
97   return ( start - rz_szB <= a  &&  a < start + size + rz_szB );
98}
99
100/*--------------------------------------------------------------------*/
101/*--- end                                                          ---*/
102/*--------------------------------------------------------------------*/
103