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      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) 2000-2015 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       VG_USERREQ__ENABLE_ADDR_ERROR_REPORTING_IN_RANGE,
    100       VG_USERREQ__DISABLE_ADDR_ERROR_REPORTING_IN_RANGE,
    101 
    102       /* This is just for memcheck's internal use - don't use it */
    103       _VG_USERREQ__MEMCHECK_RECORD_OVERLAP_ERROR
    104          = VG_USERREQ_TOOL_BASE('M','C') + 256
    105    } Vg_MemCheckClientRequest;
    106 
    107 
    108 
    109 /* Client-code macros to manipulate the state of memory. */
    110 
    111 /* Mark memory at _qzz_addr as unaddressable for _qzz_len bytes. */
    112 #define VALGRIND_MAKE_MEM_NOACCESS(_qzz_addr,_qzz_len)           \
    113     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
    114                             VG_USERREQ__MAKE_MEM_NOACCESS,       \
    115                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    116 
    117 /* Similarly, mark memory at _qzz_addr as addressable but undefined
    118    for _qzz_len bytes. */
    119 #define VALGRIND_MAKE_MEM_UNDEFINED(_qzz_addr,_qzz_len)          \
    120     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
    121                             VG_USERREQ__MAKE_MEM_UNDEFINED,      \
    122                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    123 
    124 /* Similarly, mark memory at _qzz_addr as addressable and defined
    125    for _qzz_len bytes. */
    126 #define VALGRIND_MAKE_MEM_DEFINED(_qzz_addr,_qzz_len)            \
    127     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
    128                             VG_USERREQ__MAKE_MEM_DEFINED,        \
    129                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    130 
    131 /* Similar to VALGRIND_MAKE_MEM_DEFINED except that addressability is
    132    not altered: bytes which are addressable are marked as defined,
    133    but those which are not addressable are left unchanged. */
    134 #define VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE(_qzz_addr,_qzz_len)     \
    135     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,              \
    136                             VG_USERREQ__MAKE_MEM_DEFINED_IF_ADDRESSABLE, \
    137                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    138 
    139 /* Create a block-description handle.  The description is an ascii
    140    string which is included in any messages pertaining to addresses
    141    within the specified memory range.  Has no other effect on the
    142    properties of the memory range. */
    143 #define VALGRIND_CREATE_BLOCK(_qzz_addr,_qzz_len, _qzz_desc)	   \
    144     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,        \
    145                             VG_USERREQ__CREATE_BLOCK,              \
    146                             (_qzz_addr), (_qzz_len), (_qzz_desc),  \
    147                             0, 0)
    148 
    149 /* Discard a block-description-handle. Returns 1 for an
    150    invalid handle, 0 for a valid handle. */
    151 #define VALGRIND_DISCARD(_qzz_blkindex)                          \
    152     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,      \
    153                             VG_USERREQ__DISCARD,                 \
    154                             0, (_qzz_blkindex), 0, 0, 0)
    155 
    156 
    157 /* Client-code macros to check the state of memory. */
    158 
    159 /* Check that memory at _qzz_addr is addressable for _qzz_len bytes.
    160    If suitable addressibility is not established, Valgrind prints an
    161    error message and returns the address of the first offending byte.
    162    Otherwise it returns zero. */
    163 #define VALGRIND_CHECK_MEM_IS_ADDRESSABLE(_qzz_addr,_qzz_len)      \
    164     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                             \
    165                             VG_USERREQ__CHECK_MEM_IS_ADDRESSABLE,  \
    166                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    167 
    168 /* Check that memory at _qzz_addr is addressable and defined for
    169    _qzz_len bytes.  If suitable addressibility and definedness are not
    170    established, Valgrind prints an error message and returns the
    171    address of the first offending byte.  Otherwise it returns zero. */
    172 #define VALGRIND_CHECK_MEM_IS_DEFINED(_qzz_addr,_qzz_len)        \
    173     VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                           \
    174                             VG_USERREQ__CHECK_MEM_IS_DEFINED,    \
    175                             (_qzz_addr), (_qzz_len), 0, 0, 0)
    176 
    177 /* Use this macro to force the definedness and addressibility of an
    178    lvalue to be checked.  If suitable addressibility and definedness
    179    are not established, Valgrind prints an error message and returns
    180    the address of the first offending byte.  Otherwise it returns
    181    zero. */
    182 #define VALGRIND_CHECK_VALUE_IS_DEFINED(__lvalue)                \
    183    VALGRIND_CHECK_MEM_IS_DEFINED(                                \
    184       (volatile unsigned char *)&(__lvalue),                     \
    185                       (unsigned long)(sizeof (__lvalue)))
    186 
    187 
    188 /* Do a full memory leak check (like --leak-check=full) mid-execution. */
    189 #define VALGRIND_DO_LEAK_CHECK                                   \
    190     VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DO_LEAK_CHECK,   \
    191                                     0, 0, 0, 0, 0)
    192 
    193 /* Same as VALGRIND_DO_LEAK_CHECK but only showing the entries for
    194    which there was an increase in leaked bytes or leaked nr of blocks
    195    since the previous leak search. */
    196 #define VALGRIND_DO_ADDED_LEAK_CHECK                            \
    197     VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DO_LEAK_CHECK,  \
    198                                     0, 1, 0, 0, 0)
    199 
    200 /* Same as VALGRIND_DO_ADDED_LEAK_CHECK but showing entries with
    201    increased or decreased leaked bytes/blocks since previous leak
    202    search. */
    203 #define VALGRIND_DO_CHANGED_LEAK_CHECK                          \
    204     VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DO_LEAK_CHECK,  \
    205                                     0, 2, 0, 0, 0)
    206 
    207 /* Do a summary memory leak check (like --leak-check=summary) mid-execution. */
    208 #define VALGRIND_DO_QUICK_LEAK_CHECK                             \
    209     VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DO_LEAK_CHECK,   \
    210                                     1, 0, 0, 0, 0)
    211 
    212 /* Return number of leaked, dubious, reachable and suppressed bytes found by
    213    all previous leak checks.  They must be lvalues.  */
    214 #define VALGRIND_COUNT_LEAKS(leaked, dubious, reachable, suppressed)     \
    215    /* For safety on 64-bit platforms we assign the results to private
    216       unsigned long variables, then assign these to the lvalues the user
    217       specified, which works no matter what type 'leaked', 'dubious', etc
    218       are.  We also initialise '_qzz_leaked', etc because
    219       VG_USERREQ__COUNT_LEAKS doesn't mark the values returned as
    220       defined. */                                                        \
    221    {                                                                     \
    222     unsigned long _qzz_leaked    = 0, _qzz_dubious    = 0;               \
    223     unsigned long _qzz_reachable = 0, _qzz_suppressed = 0;               \
    224     VALGRIND_DO_CLIENT_REQUEST_STMT(                                     \
    225                                VG_USERREQ__COUNT_LEAKS,                  \
    226                                &_qzz_leaked, &_qzz_dubious,              \
    227                                &_qzz_reachable, &_qzz_suppressed, 0);    \
    228     leaked     = _qzz_leaked;                                            \
    229     dubious    = _qzz_dubious;                                           \
    230     reachable  = _qzz_reachable;                                         \
    231     suppressed = _qzz_suppressed;                                        \
    232    }
    233 
    234 /* Return number of leaked, dubious, reachable and suppressed bytes found by
    235    all previous leak checks.  They must be lvalues.  */
    236 #define VALGRIND_COUNT_LEAK_BLOCKS(leaked, dubious, reachable, suppressed) \
    237    /* For safety on 64-bit platforms we assign the results to private
    238       unsigned long variables, then assign these to the lvalues the user
    239       specified, which works no matter what type 'leaked', 'dubious', etc
    240       are.  We also initialise '_qzz_leaked', etc because
    241       VG_USERREQ__COUNT_LEAKS doesn't mark the values returned as
    242       defined. */                                                        \
    243    {                                                                     \
    244     unsigned long _qzz_leaked    = 0, _qzz_dubious    = 0;               \
    245     unsigned long _qzz_reachable = 0, _qzz_suppressed = 0;               \
    246     VALGRIND_DO_CLIENT_REQUEST_STMT(                                     \
    247                                VG_USERREQ__COUNT_LEAK_BLOCKS,            \
    248                                &_qzz_leaked, &_qzz_dubious,              \
    249                                &_qzz_reachable, &_qzz_suppressed, 0);    \
    250     leaked     = _qzz_leaked;                                            \
    251     dubious    = _qzz_dubious;                                           \
    252     reachable  = _qzz_reachable;                                         \
    253     suppressed = _qzz_suppressed;                                        \
    254    }
    255 
    256 
    257 /* Get the validity data for addresses [zza..zza+zznbytes-1] and copy it
    258    into the provided zzvbits array.  Return values:
    259       0   if not running on valgrind
    260       1   success
    261       2   [previously indicated unaligned arrays;  these are now allowed]
    262       3   if any parts of zzsrc/zzvbits are not addressable.
    263    The metadata is not copied in cases 0, 2 or 3 so it should be
    264    impossible to segfault your system by using this call.
    265 */
    266 #define VALGRIND_GET_VBITS(zza,zzvbits,zznbytes)                \
    267     (unsigned)VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                \
    268                                     VG_USERREQ__GET_VBITS,      \
    269                                     (const char*)(zza),         \
    270                                     (char*)(zzvbits),           \
    271                                     (zznbytes), 0, 0)
    272 
    273 /* Set the validity data for addresses [zza..zza+zznbytes-1], copying it
    274    from the provided zzvbits array.  Return values:
    275       0   if not running on valgrind
    276       1   success
    277       2   [previously indicated unaligned arrays;  these are now allowed]
    278       3   if any parts of zza/zzvbits are not addressable.
    279    The metadata is not copied in cases 0, 2 or 3 so it should be
    280    impossible to segfault your system by using this call.
    281 */
    282 #define VALGRIND_SET_VBITS(zza,zzvbits,zznbytes)                \
    283     (unsigned)VALGRIND_DO_CLIENT_REQUEST_EXPR(0,                \
    284                                     VG_USERREQ__SET_VBITS,      \
    285                                     (const char*)(zza),         \
    286                                     (const char*)(zzvbits),     \
    287                                     (zznbytes), 0, 0 )
    288 
    289 /* Disable and re-enable reporting of addressing errors in the
    290    specified address range. */
    291 #define VALGRIND_DISABLE_ADDR_ERROR_REPORTING_IN_RANGE(_qzz_addr,_qzz_len) \
    292     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,    \
    293        VG_USERREQ__DISABLE_ADDR_ERROR_REPORTING_IN_RANGE,      \
    294        (_qzz_addr), (_qzz_len), 0, 0, 0)
    295 
    296 #define VALGRIND_ENABLE_ADDR_ERROR_REPORTING_IN_RANGE(_qzz_addr,_qzz_len) \
    297     VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default return */,    \
    298        VG_USERREQ__ENABLE_ADDR_ERROR_REPORTING_IN_RANGE,       \
    299        (_qzz_addr), (_qzz_len), 0, 0, 0)
    300 
    301 #endif
    302 
    303