src/src/memcheck.h

   1
   2 /*
   3    ----------------------------------------------------------------
   4
   5    Notice that the following BSD-style license applies to this one
   6    file (memcheck.h) only.  The rest of Valgrind is licensed under the
   7    terms of the GNU General Public License, version 2, unless
   8    otherwise indicated.  See the COPYING file in the source
   9    distribution for details.
  10
  11    ----------------------------------------------------------------
  12
  13    This file is part of MemCheck, a heavyweight Valgrind tool for
  14    detecting memory errors.
  15
  16    Copyright (C) 2000-2010 Julian Seward.  All rights reserved.
  17
  18    Redistribution and use in source and binary forms, with or without
  19    modification, are permitted provided that the following conditions
  20    are met:
  21
  22    1. Redistributions of source code must retain the above copyright
  23       notice, this list of conditions and the following disclaimer.
  24
  25    2. The origin of this software must not be misrepresented; you must
  26       not claim that you wrote the original software.  If you use this
  27       software in a product, an acknowledgment in the product
  28       documentation would be appreciated but is not required.
  29
  30    3. Altered source versions must be plainly marked as such, and must
  31       not be misrepresented as being the original software.
  32
  33    4. The name of the author may not be used to endorse or promote
  34       products derived from this software without specific prior written
  35       permission.
  36
  37    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  38    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  39    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  40    ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  41    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  42    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  43    GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  44    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  45    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  46    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  47    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  48
  49    ----------------------------------------------------------------
  50
  51    Notice that the above BSD-style license applies to this one file
  52    (memcheck.h) only.  The entire rest of Valgrind is licensed under
  53    the terms of the GNU General Public License, version 2.  See the
  54    COPYING file in the source distribution for details.
  55
  56    ----------------------------------------------------------------
  57 */
  58
  59
  60 #ifndef __MEMCHECK_H
  61 #define __MEMCHECK_H
  62
  63
  64 /* This file is for inclusion into client (your!) code.
  65
  66    You can use these macros to manipulate and query memory permissions
  67    inside your own programs.
  68
  69    See comment near the top of valgrind.h on how to use them.
  70 */
  71
  72 #include "valgrind.h"
  73
  74 /* !! ABIWARNING !! ABIWARNING !! ABIWARNING !! ABIWARNING !!
  75    This enum comprises an ABI exported by Valgrind to programs
  76    which use client requests.  DO NOT CHANGE THE ORDER OF THESE
  77    ENTRIES, NOR DELETE ANY -- add new ones at the end. */
  78 typedef
  79    enum {
  80       VG_USERREQ__MAKE_MEM_NOACCESS = VG_USERREQ_TOOL_BASE('M','C'),
  81       VG_USERREQ__MAKE_MEM_UNDEFINED,
  82       VG_USERREQ__MAKE_MEM_DEFINED,
  83       VG_USERREQ__DISCARD,
  84       VG_USERREQ__CHECK_MEM_IS_ADDRESSABLE,
  85       VG_USERREQ__CHECK_MEM_IS_DEFINED,
  86       VG_USERREQ__DO_LEAK_CHECK,
  87       VG_USERREQ__COUNT_LEAKS,
  88
  89       VG_USERREQ__GET_VBITS,
  90       VG_USERREQ__SET_VBITS,
  91
  92       VG_USERREQ__CREATE_BLOCK,
  93
  94       VG_USERREQ__MAKE_MEM_DEFINED_IF_ADDRESSABLE,
  95
  96       /* Not next to VG_USERREQ__COUNT_LEAKS because it was added later. */
  97       VG_USERREQ__COUNT_LEAK_BLOCKS,
  98
  99       /* This is just for memcheck's internal use - don't use it */
 100       _VG_USERREQ__MEMCHECK_RECORD_OVERLAP_ERROR
 101          = VG_USERREQ_TOOL_BASE('M','C') + 256
 102    } Vg_MemCheckClientRequest;
 103
 104
 105
 106 /* Client-code macros to manipulate the state of memory. */
 107
 108 /* Mark memory at _qzz_addr as unaddressable for _qzz_len bytes. */
 109 #define VALGRIND_MAKE_MEM_NOACCESS(_qzz_addr,_qzz_len)           \
 110     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
 111                             VG_USERREQ__MAKE_MEM_NOACCESS,       \
 112                             (_qzz_addr), (_qzz_len), 0, 0, 0)
 113
 114 /* Similarly, mark memory at _qzz_addr as addressable but undefined
 115    for _qzz_len bytes. */
 116 #define VALGRIND_MAKE_MEM_UNDEFINED(_qzz_addr,_qzz_len)          \
 117     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
 118                             VG_USERREQ__MAKE_MEM_UNDEFINED,      \
 119                             (_qzz_addr), (_qzz_len), 0, 0, 0)
 120
 121 /* Similarly, mark memory at _qzz_addr as addressable and defined
 122    for _qzz_len bytes. */
 123 #define VALGRIND_MAKE_MEM_DEFINED(_qzz_addr,_qzz_len)            \
 124     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
 125                             VG_USERREQ__MAKE_MEM_DEFINED,        \
 126                             (_qzz_addr), (_qzz_len), 0, 0, 0)
 127
 128 /* Similar to VALGRIND_MAKE_MEM_DEFINED except that addressability is
 129    not altered: bytes which are addressable are marked as defined,
 130    but those which are not addressable are left unchanged. */
 131 #define VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE(_qzz_addr,_qzz_len)     \
 132     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,              \
 133                             VG_USERREQ__MAKE_MEM_DEFINED_IF_ADDRESSABLE, \
 134                             (_qzz_addr), (_qzz_len), 0, 0, 0)
 135
 136 /* Create a block-description handle.  The description is an ascii
 137    string which is included in any messages pertaining to addresses
 138    within the specified memory range.  Has no other effect on the
 139    properties of the memory range. */
 140 #define VALGRIND_CREATE_BLOCK(_qzz_addr,_qzz_len, _qzz_desc)       \
 141     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,        \
 142                             VG_USERREQ__CREATE_BLOCK,              \
 143                             (_qzz_addr), (_qzz_len), (_qzz_desc),  \
 144                             0, 0)
 145
 146 /* Discard a block-description-handle. Returns 1 for an
 147    invalid handle, 0 for a valid handle. */
 148 #define VALGRIND_DISCARD(_qzz_blkindex)                          \
 149     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
 150                             VG_USERREQ__DISCARD,                 \
 151                             0, (_qzz_blkindex), 0, 0, 0)
 152
 153
 154 /* Client-code macros to check the state of memory. */
 155
 156 /* Check that memory at _qzz_addr is addressable for _qzz_len bytes.
 157    If suitable addressibility is not established, Valgrind prints an
 158    error message and returns the address of the first offending byte.
 159    Otherwise it returns zero. */
 160 #define VALGRIND_CHECK_MEM_IS_ADDRESSABLE(_qzz_addr,_qzz_len)      \
 161     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                             \
 162                             VG_USERREQ__CHECK_MEM_IS_ADDRESSABLE,  \
 163                             (_qzz_addr), (_qzz_len), 0, 0, 0)
 164
 165 /* Check that memory at _qzz_addr is addressable and defined for
 166    _qzz_len bytes.  If suitable addressibility and definedness are not
 167    established, Valgrind prints an error message and returns the
 168    address of the first offending byte.  Otherwise it returns zero. */
 169 #define VALGRIND_CHECK_MEM_IS_DEFINED(_qzz_addr,_qzz_len)        \
 170     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                           \
 171                             VG_USERREQ__CHECK_MEM_IS_DEFINED,    \
 172                             (_qzz_addr), (_qzz_len), 0, 0, 0);
 173
 174 /* Use this macro to force the definedness and addressibility of an
 175    lvalue to be checked.  If suitable addressibility and definedness
 176    are not established, Valgrind prints an error message and returns
 177    the address of the first offending byte.  Otherwise it returns
 178    zero. */
 179 #define VALGRIND_CHECK_VALUE_IS_DEFINED(__lvalue)                \
 180    VALGRIND_CHECK_MEM_IS_DEFINED(                                \
 181       (volatile unsigned char *)&(__lvalue),                     \
 182                       (unsigned long)(sizeof (__lvalue)))
 183
 184
 185 /* Do a full memory leak check (like --leak-check=full) mid-execution. */
 186 #define VALGRIND_DO_LEAK_CHECK                                   \
 187    {unsigned long _qzz_res;                                      \
 188     VALGRIND_DO_CLIENT_REQUEST(_qzz_res, 0,                      \
 189                             VG_USERREQ__DO_LEAK_CHECK,           \
 190                             0, 0, 0, 0, 0);                      \
 191    }
 192
 193 /* Do a summary memory leak check (like --leak-check=summary) mid-execution. */
 194 #define VALGRIND_DO_QUICK_LEAK_CHECK                             \
 195    {unsigned long _qzz_res;                                      \
 196     VALGRIND_DO_CLIENT_REQUEST(_qzz_res, 0,                      \
 197                             VG_USERREQ__DO_LEAK_CHECK,           \
 198                             1, 0, 0, 0, 0);                      \
 199    }
 200
 201 /* Return number of leaked, dubious, reachable and suppressed bytes found by
 202    all previous leak checks.  They must be lvalues.  */
 203 #define VALGRIND_COUNT_LEAKS(leaked, dubious, reachable, suppressed)     \
 204    /* For safety on 64-bit platforms we assign the results to private
 205       unsigned long variables, then assign these to the lvalues the user
 206       specified, which works no matter what type 'leaked', 'dubious', etc
 207       are.  We also initialise '_qzz_leaked', etc because
 208       VG_USERREQ__COUNT_LEAKS doesn't mark the values returned as
 209       defined. */                                                        \
 210    {unsigned long _qzz_res;                                              \
 211     unsigned long _qzz_leaked    = 0, _qzz_dubious    = 0;               \
 212     unsigned long _qzz_reachable = 0, _qzz_suppressed = 0;               \
 213     VALGRIND_DO_CLIENT_REQUEST(_qzz_res, 0,                              \
 214                                VG_USERREQ__COUNT_LEAKS,                  \
 215                                &_qzz_leaked, &_qzz_dubious,              \
 216                                &_qzz_reachable, &_qzz_suppressed, 0);    \
 217     leaked     = _qzz_leaked;                                            \
 218     dubious    = _qzz_dubious;                                           \
 219     reachable  = _qzz_reachable;                                         \
 220     suppressed = _qzz_suppressed;                                        \
 221    }
 222
 223 /* Return number of leaked, dubious, reachable and suppressed bytes found by
 224    all previous leak checks.  They must be lvalues.  */
 225 #define VALGRIND_COUNT_LEAK_BLOCKS(leaked, dubious, reachable, suppressed) \
 226    /* For safety on 64-bit platforms we assign the results to private
 227       unsigned long variables, then assign these to the lvalues the user
 228       specified, which works no matter what type 'leaked', 'dubious', etc
 229       are.  We also initialise '_qzz_leaked', etc because
 230       VG_USERREQ__COUNT_LEAKS doesn't mark the values returned as
 231       defined. */                                                        \
 232    {unsigned long _qzz_res;                                              \
 233     unsigned long _qzz_leaked    = 0, _qzz_dubious    = 0;               \
 234     unsigned long _qzz_reachable = 0, _qzz_suppressed = 0;               \
 235     VALGRIND_DO_CLIENT_REQUEST(_qzz_res, 0,                              \
 236                                VG_USERREQ__COUNT_LEAK_BLOCKS,            \
 237                                &_qzz_leaked, &_qzz_dubious,              \
 238                                &_qzz_reachable, &_qzz_suppressed, 0);    \
 239     leaked     = _qzz_leaked;                                            \
 240     dubious    = _qzz_dubious;                                           \
 241     reachable  = _qzz_reachable;                                         \
 242     suppressed = _qzz_suppressed;                                        \
 243    }
 244
 245
 246 /* Get the validity data for addresses [zza..zza+zznbytes-1] and copy it
 247    into the provided zzvbits array.  Return values:
 248       0   if not running on valgrind
 249       1   success
 250       2   [previously indicated unaligned arrays;  these are now allowed]
 251       3   if any parts of zzsrc/zzvbits are not addressable.
 252    The metadata is not copied in cases 0, 2 or 3 so it should be
 253    impossible to segfault your system by using this call.
 254 */
 255 #define VALGRIND_GET_VBITS(zza,zzvbits,zznbytes)                     \
 256     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                               \
 257                                     VG_USERREQ__GET_VBITS,           \
 258                                     (char*)(zza), (char*)(zzvbits),  \
 259                                     (zznbytes), 0, 0)
 260
 261 /* Set the validity data for addresses [zza..zza+zznbytes-1], copying it
 262    from the provided zzvbits array.  Return values:
 263       0   if not running on valgrind
 264       1   success
 265       2   [previously indicated unaligned arrays;  these are now allowed]
 266       3   if any parts of zza/zzvbits are not addressable.
 267    The metadata is not copied in cases 0, 2 or 3 so it should be
 268    impossible to segfault your system by using this call.
 269 */
 270 #define VALGRIND_SET_VBITS(zza,zzvbits,zznbytes)                     \
 271     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                               \
 272                                     VG_USERREQ__SET_VBITS,           \
 273                                     (char*)(zza), (char*)(zzvbits),  \
 274                                     (zznbytes), 0, 0 )
 275
 276 #endif
 277