1 /* 2 ---------------------------------------------------------------- 3 4 Notice that the above BSD-style license applies to this one file 5 (helgrind.h) only. The entire rest of Valgrind is licensed under 6 the terms of the GNU General Public License, version 2. See the 7 COPYING file in the source distribution for details. 8 9 ---------------------------------------------------------------- 10 11 This file is part of Helgrind, a Valgrind tool for detecting errors 12 in threaded programs. 13 14 Copyright (C) 2007-2015 OpenWorks LLP 15 info (at) open-works.co.uk 16 17 Redistribution and use in source and binary forms, with or without 18 modification, are permitted provided that the following conditions 19 are met: 20 21 1. Redistributions of source code must retain the above copyright 22 notice, this list of conditions and the following disclaimer. 23 24 2. The origin of this software must not be misrepresented; you must 25 not claim that you wrote the original software. If you use this 26 software in a product, an acknowledgment in the product 27 documentation would be appreciated but is not required. 28 29 3. Altered source versions must be plainly marked as such, and must 30 not be misrepresented as being the original software. 31 32 4. The name of the author may not be used to endorse or promote 33 products derived from this software without specific prior written 34 permission. 35 36 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 37 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 38 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 40 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 42 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 43 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 44 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 45 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 46 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 47 48 ---------------------------------------------------------------- 49 50 Notice that the above BSD-style license applies to this one file 51 (helgrind.h) only. The entire rest of Valgrind is licensed under 52 the terms of the GNU General Public License, version 2. See the 53 COPYING file in the source distribution for details. 54 55 ---------------------------------------------------------------- 56 */ 57 58 #ifndef __HELGRIND_H 59 #define __HELGRIND_H 60 61 #include "valgrind.h" 62 63 /* !! ABIWARNING !! ABIWARNING !! ABIWARNING !! ABIWARNING !! 64 This enum comprises an ABI exported by Valgrind to programs 65 which use client requests. DO NOT CHANGE THE ORDER OF THESE 66 ENTRIES, NOR DELETE ANY -- add new ones at the end. */ 67 typedef 68 enum { 69 VG_USERREQ__HG_CLEAN_MEMORY = VG_USERREQ_TOOL_BASE('H','G'), 70 71 /* The rest are for Helgrind's internal use. Not for end-user 72 use. Do not use them unless you are a Valgrind developer. */ 73 74 /* Notify the tool what this thread's pthread_t is. */ 75 _VG_USERREQ__HG_SET_MY_PTHREAD_T = VG_USERREQ_TOOL_BASE('H','G') 76 + 256, 77 _VG_USERREQ__HG_PTH_API_ERROR, /* char*, int */ 78 _VG_USERREQ__HG_PTHREAD_JOIN_POST, /* pthread_t of quitter */ 79 _VG_USERREQ__HG_PTHREAD_MUTEX_INIT_POST, /* pth_mx_t*, long mbRec */ 80 _VG_USERREQ__HG_PTHREAD_MUTEX_DESTROY_PRE, /* pth_mx_t*, long isInit */ 81 _VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_PRE, /* pth_mx_t* */ 82 _VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_POST, /* pth_mx_t* */ 83 _VG_USERREQ__HG_PTHREAD_MUTEX_ACQUIRE_PRE, /* void*, long isTryLock */ 84 _VG_USERREQ__HG_PTHREAD_MUTEX_ACQUIRE_POST, /* void* */ 85 _VG_USERREQ__HG_PTHREAD_COND_SIGNAL_PRE, /* pth_cond_t* */ 86 _VG_USERREQ__HG_PTHREAD_COND_BROADCAST_PRE, /* pth_cond_t* */ 87 _VG_USERREQ__HG_PTHREAD_COND_WAIT_PRE, /* pth_cond_t*, pth_mx_t* */ 88 _VG_USERREQ__HG_PTHREAD_COND_WAIT_POST, /* pth_cond_t*, pth_mx_t* */ 89 _VG_USERREQ__HG_PTHREAD_COND_DESTROY_PRE, /* pth_cond_t*, long isInit */ 90 _VG_USERREQ__HG_PTHREAD_RWLOCK_INIT_POST, /* pth_rwlk_t* */ 91 _VG_USERREQ__HG_PTHREAD_RWLOCK_DESTROY_PRE, /* pth_rwlk_t* */ 92 _VG_USERREQ__HG_PTHREAD_RWLOCK_LOCK_PRE, /* pth_rwlk_t*, long isW */ 93 _VG_USERREQ__HG_PTHREAD_RWLOCK_ACQUIRED, /* void*, long isW */ 94 _VG_USERREQ__HG_PTHREAD_RWLOCK_RELEASED, /* void* */ 95 _VG_USERREQ__HG_PTHREAD_RWLOCK_UNLOCK_POST, /* pth_rwlk_t* */ 96 _VG_USERREQ__HG_POSIX_SEM_INIT_POST, /* sem_t*, ulong value */ 97 _VG_USERREQ__HG_POSIX_SEM_DESTROY_PRE, /* sem_t* */ 98 _VG_USERREQ__HG_POSIX_SEM_RELEASED, /* void* */ 99 _VG_USERREQ__HG_POSIX_SEM_ACQUIRED, /* void* */ 100 _VG_USERREQ__HG_PTHREAD_BARRIER_INIT_PRE, /* pth_bar_t*, ulong, ulong */ 101 _VG_USERREQ__HG_PTHREAD_BARRIER_WAIT_PRE, /* pth_bar_t* */ 102 _VG_USERREQ__HG_PTHREAD_BARRIER_DESTROY_PRE, /* pth_bar_t* */ 103 _VG_USERREQ__HG_PTHREAD_SPIN_INIT_OR_UNLOCK_PRE, /* pth_slk_t* */ 104 _VG_USERREQ__HG_PTHREAD_SPIN_INIT_OR_UNLOCK_POST, /* pth_slk_t* */ 105 _VG_USERREQ__HG_PTHREAD_SPIN_LOCK_PRE, /* pth_slk_t* */ 106 _VG_USERREQ__HG_PTHREAD_SPIN_LOCK_POST, /* pth_slk_t* */ 107 _VG_USERREQ__HG_PTHREAD_SPIN_DESTROY_PRE, /* pth_slk_t* */ 108 _VG_USERREQ__HG_CLIENTREQ_UNIMP, /* char* */ 109 _VG_USERREQ__HG_USERSO_SEND_PRE, /* arbitrary UWord SO-tag */ 110 _VG_USERREQ__HG_USERSO_RECV_POST, /* arbitrary UWord SO-tag */ 111 _VG_USERREQ__HG_USERSO_FORGET_ALL, /* arbitrary UWord SO-tag */ 112 _VG_USERREQ__HG_RESERVED2, /* Do not use */ 113 _VG_USERREQ__HG_RESERVED3, /* Do not use */ 114 _VG_USERREQ__HG_RESERVED4, /* Do not use */ 115 _VG_USERREQ__HG_ARANGE_MAKE_UNTRACKED, /* Addr a, ulong len */ 116 _VG_USERREQ__HG_ARANGE_MAKE_TRACKED, /* Addr a, ulong len */ 117 _VG_USERREQ__HG_PTHREAD_BARRIER_RESIZE_PRE, /* pth_bar_t*, ulong */ 118 _VG_USERREQ__HG_CLEAN_MEMORY_HEAPBLOCK, /* Addr start_of_block */ 119 _VG_USERREQ__HG_PTHREAD_COND_INIT_POST, /* pth_cond_t*, pth_cond_attr_t*/ 120 _VG_USERREQ__HG_GNAT_MASTER_HOOK, /* void*d,void*m,Word ml */ 121 _VG_USERREQ__HG_GNAT_MASTER_COMPLETED_HOOK, /* void*s,Word ml */ 122 _VG_USERREQ__HG_GET_ABITS, /* Addr a,Addr abits, ulong len */ 123 _VG_USERREQ__HG_PTHREAD_CREATE_BEGIN, 124 _VG_USERREQ__HG_PTHREAD_CREATE_END, 125 _VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_PRE, /* pth_mx_t*,long isTryLock */ 126 _VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_POST, /* pth_mx_t *,long tookLock */ 127 _VG_USERREQ__HG_PTHREAD_RWLOCK_LOCK_POST, /* pth_rwlk_t*,long isW,long */ 128 _VG_USERREQ__HG_PTHREAD_RWLOCK_UNLOCK_PRE, /* pth_rwlk_t* */ 129 _VG_USERREQ__HG_POSIX_SEM_POST_PRE, /* sem_t* */ 130 _VG_USERREQ__HG_POSIX_SEM_POST_POST, /* sem_t* */ 131 _VG_USERREQ__HG_POSIX_SEM_WAIT_PRE, /* sem_t* */ 132 _VG_USERREQ__HG_POSIX_SEM_WAIT_POST, /* sem_t*, long tookLock */ 133 _VG_USERREQ__HG_PTHREAD_COND_SIGNAL_POST, /* pth_cond_t* */ 134 _VG_USERREQ__HG_PTHREAD_COND_BROADCAST_POST,/* pth_cond_t* */ 135 _VG_USERREQ__HG_RTLD_BIND_GUARD, /* int flags */ 136 _VG_USERREQ__HG_RTLD_BIND_CLEAR /* int flags */ 137 } Vg_TCheckClientRequest; 138 139 140 /*----------------------------------------------------------------*/ 141 /*--- ---*/ 142 /*--- Implementation-only facilities. Not for end-user use. ---*/ 143 /*--- For end-user facilities see below (the next section in ---*/ 144 /*--- this file.) ---*/ 145 /*--- ---*/ 146 /*----------------------------------------------------------------*/ 147 148 /* Do a client request. These are macros rather than a functions so 149 as to avoid having an extra frame in stack traces. 150 151 NB: these duplicate definitions in hg_intercepts.c. But here, we 152 have to make do with weaker typing (no definition of Word etc) and 153 no assertions, whereas in helgrind.h we can use those facilities. 154 Obviously it's important the two sets of definitions are kept in 155 sync. 156 157 The commented-out asserts should actually hold, but unfortunately 158 they can't be allowed to be visible here, because that would 159 require the end-user code to #include <assert.h>. 160 */ 161 162 #define DO_CREQ_v_W(_creqF, _ty1F,_arg1F) \ 163 do { \ 164 long int _arg1; \ 165 /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ 166 _arg1 = (long int)(_arg1F); \ 167 VALGRIND_DO_CLIENT_REQUEST_STMT( \ 168 (_creqF), \ 169 _arg1, 0,0,0,0); \ 170 } while (0) 171 172 #define DO_CREQ_W_W(_resF, _dfltF, _creqF, _ty1F,_arg1F) \ 173 do { \ 174 long int _arg1; \ 175 /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ 176 _arg1 = (long int)(_arg1F); \ 177 _qzz_res = VALGRIND_DO_CLIENT_REQUEST_EXPR( \ 178 (_dfltF), \ 179 (_creqF), \ 180 _arg1, 0,0,0,0); \ 181 _resF = _qzz_res; \ 182 } while (0) 183 184 #define DO_CREQ_v_WW(_creqF, _ty1F,_arg1F, _ty2F,_arg2F) \ 185 do { \ 186 long int _arg1, _arg2; \ 187 /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ 188 /* assert(sizeof(_ty2F) == sizeof(long int)); */ \ 189 _arg1 = (long int)(_arg1F); \ 190 _arg2 = (long int)(_arg2F); \ 191 VALGRIND_DO_CLIENT_REQUEST_STMT( \ 192 (_creqF), \ 193 _arg1,_arg2,0,0,0); \ 194 } while (0) 195 196 #define DO_CREQ_v_WWW(_creqF, _ty1F,_arg1F, \ 197 _ty2F,_arg2F, _ty3F, _arg3F) \ 198 do { \ 199 long int _arg1, _arg2, _arg3; \ 200 /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ 201 /* assert(sizeof(_ty2F) == sizeof(long int)); */ \ 202 /* assert(sizeof(_ty3F) == sizeof(long int)); */ \ 203 _arg1 = (long int)(_arg1F); \ 204 _arg2 = (long int)(_arg2F); \ 205 _arg3 = (long int)(_arg3F); \ 206 VALGRIND_DO_CLIENT_REQUEST_STMT( \ 207 (_creqF), \ 208 _arg1,_arg2,_arg3,0,0); \ 209 } while (0) 210 211 #define DO_CREQ_W_WWW(_resF, _dfltF, _creqF, _ty1F,_arg1F, \ 212 _ty2F,_arg2F, _ty3F, _arg3F) \ 213 do { \ 214 long int _qzz_res; \ 215 long int _arg1, _arg2, _arg3; \ 216 /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ 217 _arg1 = (long int)(_arg1F); \ 218 _arg2 = (long int)(_arg2F); \ 219 _arg3 = (long int)(_arg3F); \ 220 _qzz_res = VALGRIND_DO_CLIENT_REQUEST_EXPR( \ 221 (_dfltF), \ 222 (_creqF), \ 223 _arg1,_arg2,_arg3,0,0); \ 224 _resF = _qzz_res; \ 225 } while (0) 226 227 228 229 #define _HG_CLIENTREQ_UNIMP(_qzz_str) \ 230 DO_CREQ_v_W(_VG_USERREQ__HG_CLIENTREQ_UNIMP, \ 231 (char*),(_qzz_str)) 232 233 234 /*----------------------------------------------------------------*/ 235 /*--- ---*/ 236 /*--- Helgrind-native requests. These allow access to ---*/ 237 /*--- the same set of annotation primitives that are used ---*/ 238 /*--- to build the POSIX pthread wrappers. ---*/ 239 /*--- ---*/ 240 /*----------------------------------------------------------------*/ 241 242 /* ---------------------------------------------------------- 243 For describing ordinary mutexes (non-rwlocks). For rwlock 244 descriptions see ANNOTATE_RWLOCK_* below. 245 ---------------------------------------------------------- */ 246 247 /* Notify here immediately after mutex creation. _mbRec == 0 for a 248 non-recursive mutex, 1 for a recursive mutex. */ 249 #define VALGRIND_HG_MUTEX_INIT_POST(_mutex, _mbRec) \ 250 DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_MUTEX_INIT_POST, \ 251 void*,(_mutex), long,(_mbRec)) 252 253 /* Notify here immediately before mutex acquisition. _isTryLock == 0 254 for a normal acquisition, 1 for a "try" style acquisition. */ 255 #define VALGRIND_HG_MUTEX_LOCK_PRE(_mutex, _isTryLock) \ 256 DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_MUTEX_ACQUIRE_PRE, \ 257 void*,(_mutex), long,(_isTryLock)) 258 259 /* Notify here immediately after a successful mutex acquisition. */ 260 #define VALGRIND_HG_MUTEX_LOCK_POST(_mutex) \ 261 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_ACQUIRE_POST, \ 262 void*,(_mutex)) 263 264 /* Notify here immediately before a mutex release. */ 265 #define VALGRIND_HG_MUTEX_UNLOCK_PRE(_mutex) \ 266 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_PRE, \ 267 void*,(_mutex)) 268 269 /* Notify here immediately after a mutex release. */ 270 #define VALGRIND_HG_MUTEX_UNLOCK_POST(_mutex) \ 271 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_POST, \ 272 void*,(_mutex)) 273 274 /* Notify here immediately before mutex destruction. */ 275 #define VALGRIND_HG_MUTEX_DESTROY_PRE(_mutex) \ 276 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_DESTROY_PRE, \ 277 void*,(_mutex)) 278 279 /* ---------------------------------------------------------- 280 For describing semaphores. 281 ---------------------------------------------------------- */ 282 283 /* Notify here immediately after semaphore creation. */ 284 #define VALGRIND_HG_SEM_INIT_POST(_sem, _value) \ 285 DO_CREQ_v_WW(_VG_USERREQ__HG_POSIX_SEM_INIT_POST, \ 286 void*, (_sem), unsigned long, (_value)) 287 288 /* Notify here immediately after a semaphore wait (an acquire-style 289 operation) */ 290 #define VALGRIND_HG_SEM_WAIT_POST(_sem) \ 291 DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_ACQUIRED, \ 292 void*,(_sem)) 293 294 /* Notify here immediately before semaphore post (a release-style 295 operation) */ 296 #define VALGRIND_HG_SEM_POST_PRE(_sem) \ 297 DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_RELEASED, \ 298 void*,(_sem)) 299 300 /* Notify here immediately before semaphore destruction. */ 301 #define VALGRIND_HG_SEM_DESTROY_PRE(_sem) \ 302 DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_DESTROY_PRE, \ 303 void*, (_sem)) 304 305 /* ---------------------------------------------------------- 306 For describing barriers. 307 ---------------------------------------------------------- */ 308 309 /* Notify here immediately before barrier creation. _count is the 310 capacity. _resizable == 0 means the barrier may not be resized, 1 311 means it may be. */ 312 #define VALGRIND_HG_BARRIER_INIT_PRE(_bar, _count, _resizable) \ 313 DO_CREQ_v_WWW(_VG_USERREQ__HG_PTHREAD_BARRIER_INIT_PRE, \ 314 void*,(_bar), \ 315 unsigned long,(_count), \ 316 unsigned long,(_resizable)) 317 318 /* Notify here immediately before arrival at a barrier. */ 319 #define VALGRIND_HG_BARRIER_WAIT_PRE(_bar) \ 320 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_BARRIER_WAIT_PRE, \ 321 void*,(_bar)) 322 323 /* Notify here immediately before a resize (change of barrier 324 capacity). If _newcount >= the existing capacity, then there is no 325 change in the state of any threads waiting at the barrier. If 326 _newcount < the existing capacity, and >= _newcount threads are 327 currently waiting at the barrier, then this notification is 328 considered to also have the effect of telling the checker that all 329 waiting threads have now moved past the barrier. (I can't think of 330 any other sane semantics.) */ 331 #define VALGRIND_HG_BARRIER_RESIZE_PRE(_bar, _newcount) \ 332 DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_BARRIER_RESIZE_PRE, \ 333 void*,(_bar), \ 334 unsigned long,(_newcount)) 335 336 /* Notify here immediately before barrier destruction. */ 337 #define VALGRIND_HG_BARRIER_DESTROY_PRE(_bar) \ 338 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_BARRIER_DESTROY_PRE, \ 339 void*,(_bar)) 340 341 /* ---------------------------------------------------------- 342 For describing memory ownership changes. 343 ---------------------------------------------------------- */ 344 345 /* Clean memory state. This makes Helgrind forget everything it knew 346 about the specified memory range. Effectively this announces that 347 the specified memory range now "belongs" to the calling thread, so 348 that: (1) the calling thread can access it safely without 349 synchronisation, and (2) all other threads must sync with this one 350 to access it safely. This is particularly useful for memory 351 allocators that wish to recycle memory. */ 352 #define VALGRIND_HG_CLEAN_MEMORY(_qzz_start, _qzz_len) \ 353 DO_CREQ_v_WW(VG_USERREQ__HG_CLEAN_MEMORY, \ 354 void*,(_qzz_start), \ 355 unsigned long,(_qzz_len)) 356 357 /* The same, but for the heap block starting at _qzz_blockstart. This 358 allows painting when we only know the address of an object, but not 359 its size, which is sometimes the case in C++ code involving 360 inheritance, and in which RTTI is not, for whatever reason, 361 available. Returns the number of bytes painted, which can be zero 362 for a zero-sized block. Hence, return values >= 0 indicate success 363 (the block was found), and the value -1 indicates block not 364 found, and -2 is returned when not running on Helgrind. */ 365 #define VALGRIND_HG_CLEAN_MEMORY_HEAPBLOCK(_qzz_blockstart) \ 366 (__extension__ \ 367 ({long int _npainted; \ 368 DO_CREQ_W_W(_npainted, (-2)/*default*/, \ 369 _VG_USERREQ__HG_CLEAN_MEMORY_HEAPBLOCK, \ 370 void*,(_qzz_blockstart)); \ 371 _npainted; \ 372 })) 373 374 /* ---------------------------------------------------------- 375 For error control. 376 ---------------------------------------------------------- */ 377 378 /* Tell H that an address range is not to be "tracked" until further 379 notice. This puts it in the NOACCESS state, in which case we 380 ignore all reads and writes to it. Useful for ignoring ranges of 381 memory where there might be races we don't want to see. If the 382 memory is subsequently reallocated via malloc/new/stack allocation, 383 then it is put back in the trackable state. Hence it is safe in 384 the situation where checking is disabled, the containing area is 385 deallocated and later reallocated for some other purpose. */ 386 #define VALGRIND_HG_DISABLE_CHECKING(_qzz_start, _qzz_len) \ 387 DO_CREQ_v_WW(_VG_USERREQ__HG_ARANGE_MAKE_UNTRACKED, \ 388 void*,(_qzz_start), \ 389 unsigned long,(_qzz_len)) 390 391 /* And put it back into the normal "tracked" state, that is, make it 392 once again subject to the normal race-checking machinery. This 393 puts it in the same state as new memory allocated by this thread -- 394 that is, basically owned exclusively by this thread. */ 395 #define VALGRIND_HG_ENABLE_CHECKING(_qzz_start, _qzz_len) \ 396 DO_CREQ_v_WW(_VG_USERREQ__HG_ARANGE_MAKE_TRACKED, \ 397 void*,(_qzz_start), \ 398 unsigned long,(_qzz_len)) 399 400 401 /* Checks the accessibility bits for addresses [zza..zza+zznbytes-1]. 402 If zzabits array is provided, copy the accessibility bits in zzabits. 403 Return values: 404 -2 if not running on helgrind 405 -1 if any parts of zzabits is not addressable 406 >= 0 : success. 407 When success, it returns the nr of addressable bytes found. 408 So, to check that a whole range is addressable, check 409 VALGRIND_HG_GET_ABITS(addr,NULL,len) == len 410 In addition, if you want to examine the addressability of each 411 byte of the range, you need to provide a non NULL ptr as 412 second argument, pointing to an array of unsigned char 413 of length len. 414 Addressable bytes are indicated with 0xff. 415 Non-addressable bytes are indicated with 0x00. 416 */ 417 #define VALGRIND_HG_GET_ABITS(zza,zzabits,zznbytes) \ 418 (__extension__ \ 419 ({long int _res; \ 420 DO_CREQ_W_WWW(_res, (-2)/*default*/, \ 421 _VG_USERREQ__HG_GET_ABITS, \ 422 void*,(zza), void*,(zzabits), \ 423 unsigned long,(zznbytes)); \ 424 _res; \ 425 })) 426 427 /*----------------------------------------------------------------*/ 428 /*--- ---*/ 429 /*--- ThreadSanitizer-compatible requests ---*/ 430 /*--- (mostly unimplemented) ---*/ 431 /*--- ---*/ 432 /*----------------------------------------------------------------*/ 433 434 /* A quite-broad set of annotations, as used in the ThreadSanitizer 435 project. This implementation aims to be a (source-level) 436 compatible implementation of the macros defined in: 437 438 http://code.google.com/p/data-race-test/source 439 /browse/trunk/dynamic_annotations/dynamic_annotations.h 440 441 (some of the comments below are taken from the above file) 442 443 The implementation here is very incomplete, and intended as a 444 starting point. Many of the macros are unimplemented. Rather than 445 allowing unimplemented macros to silently do nothing, they cause an 446 assertion. Intention is to implement them on demand. 447 448 The major use of these macros is to make visible to race detectors, 449 the behaviour (effects) of user-implemented synchronisation 450 primitives, that the detectors could not otherwise deduce from the 451 normal observation of pthread etc calls. 452 453 Some of the macros are no-ops in Helgrind. That's because Helgrind 454 is a pure happens-before detector, whereas ThreadSanitizer uses a 455 hybrid lockset and happens-before scheme, which requires more 456 accurate annotations for correct operation. 457 458 The macros are listed in the same order as in dynamic_annotations.h 459 (URL just above). 460 461 I should point out that I am less than clear about the intended 462 semantics of quite a number of them. Comments and clarifications 463 welcomed! 464 */ 465 466 /* ---------------------------------------------------------------- 467 These four allow description of user-level condition variables, 468 apparently in the style of POSIX's pthread_cond_t. Currently 469 unimplemented and will assert. 470 ---------------------------------------------------------------- 471 */ 472 /* Report that wait on the condition variable at address CV has 473 succeeded and the lock at address LOCK is now held. CV and LOCK 474 are completely arbitrary memory addresses which presumably mean 475 something to the application, but are meaningless to Helgrind. */ 476 #define ANNOTATE_CONDVAR_LOCK_WAIT(cv, lock) \ 477 _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_LOCK_WAIT") 478 479 /* Report that wait on the condition variable at CV has succeeded. 480 Variant w/o lock. */ 481 #define ANNOTATE_CONDVAR_WAIT(cv) \ 482 _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_WAIT") 483 484 /* Report that we are about to signal on the condition variable at 485 address CV. */ 486 #define ANNOTATE_CONDVAR_SIGNAL(cv) \ 487 _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_SIGNAL") 488 489 /* Report that we are about to signal_all on the condition variable at 490 CV. */ 491 #define ANNOTATE_CONDVAR_SIGNAL_ALL(cv) \ 492 _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_SIGNAL_ALL") 493 494 495 /* ---------------------------------------------------------------- 496 Create completely arbitrary happens-before edges between threads. 497 498 If threads T1 .. Tn all do ANNOTATE_HAPPENS_BEFORE(obj) and later 499 (w.r.t. some notional global clock for the computation) thread Tm 500 does ANNOTATE_HAPPENS_AFTER(obj), then Helgrind will regard all 501 memory accesses done by T1 .. Tn before the ..BEFORE.. call as 502 happening-before all memory accesses done by Tm after the 503 ..AFTER.. call. Hence Helgrind won't complain about races if Tm's 504 accesses afterwards are to the same locations as accesses before by 505 any of T1 .. Tn. 506 507 OBJ is a machine word (unsigned long, or void*), is completely 508 arbitrary, and denotes the identity of some synchronisation object 509 you're modelling. 510 511 You must do the _BEFORE call just before the real sync event on the 512 signaller's side, and _AFTER just after the real sync event on the 513 waiter's side. 514 515 If none of the rest of these macros make sense to you, at least 516 take the time to understand these two. They form the very essence 517 of describing arbitrary inter-thread synchronisation events to 518 Helgrind. You can get a long way just with them alone. 519 520 See also, extensive discussion on semantics of this in 521 https://bugs.kde.org/show_bug.cgi?id=243935 522 523 ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) is interim until such time 524 as bug 243935 is fully resolved. It instructs Helgrind to forget 525 about any ANNOTATE_HAPPENS_BEFORE calls on the specified object, in 526 effect putting it back in its original state. Once in that state, 527 a use of ANNOTATE_HAPPENS_AFTER on it has no effect on the calling 528 thread. 529 530 An implementation may optionally release resources it has 531 associated with 'obj' when ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) 532 happens. Users are recommended to use 533 ANNOTATE_HAPPENS_BEFORE_FORGET_ALL to indicate when a 534 synchronisation object is no longer needed, so as to avoid 535 potential indefinite resource leaks. 536 ---------------------------------------------------------------- 537 */ 538 #define ANNOTATE_HAPPENS_BEFORE(obj) \ 539 DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_SEND_PRE, void*,(obj)) 540 541 #define ANNOTATE_HAPPENS_AFTER(obj) \ 542 DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_RECV_POST, void*,(obj)) 543 544 #define ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) \ 545 DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_FORGET_ALL, void*,(obj)) 546 547 /* ---------------------------------------------------------------- 548 Memory publishing. The TSan sources say: 549 550 Report that the bytes in the range [pointer, pointer+size) are about 551 to be published safely. The race checker will create a happens-before 552 arc from the call ANNOTATE_PUBLISH_MEMORY_RANGE(pointer, size) to 553 subsequent accesses to this memory. 554 555 I'm not sure I understand what this means exactly, nor whether it 556 is relevant for a pure h-b detector. Leaving unimplemented for 557 now. 558 ---------------------------------------------------------------- 559 */ 560 #define ANNOTATE_PUBLISH_MEMORY_RANGE(pointer, size) \ 561 _HG_CLIENTREQ_UNIMP("ANNOTATE_PUBLISH_MEMORY_RANGE") 562 563 /* DEPRECATED. Don't use it. */ 564 /* #define ANNOTATE_UNPUBLISH_MEMORY_RANGE(pointer, size) */ 565 566 /* DEPRECATED. Don't use it. */ 567 /* #define ANNOTATE_SWAP_MEMORY_RANGE(pointer, size) */ 568 569 570 /* ---------------------------------------------------------------- 571 TSan sources say: 572 573 Instruct the tool to create a happens-before arc between 574 MU->Unlock() and MU->Lock(). This annotation may slow down the 575 race detector; normally it is used only when it would be 576 difficult to annotate each of the mutex's critical sections 577 individually using the annotations above. 578 579 If MU is a posix pthread_mutex_t then Helgrind will do this anyway. 580 In any case, leave as unimp for now. I'm unsure about the intended 581 behaviour. 582 ---------------------------------------------------------------- 583 */ 584 #define ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(mu) \ 585 _HG_CLIENTREQ_UNIMP("ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX") 586 587 /* Deprecated. Use ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX. */ 588 /* #define ANNOTATE_MUTEX_IS_USED_AS_CONDVAR(mu) */ 589 590 591 /* ---------------------------------------------------------------- 592 TSan sources say: 593 594 Annotations useful when defining memory allocators, or when 595 memory that was protected in one way starts to be protected in 596 another. 597 598 Report that a new memory at "address" of size "size" has been 599 allocated. This might be used when the memory has been retrieved 600 from a free list and is about to be reused, or when a the locking 601 discipline for a variable changes. 602 603 AFAICS this is the same as VALGRIND_HG_CLEAN_MEMORY. 604 ---------------------------------------------------------------- 605 */ 606 #define ANNOTATE_NEW_MEMORY(address, size) \ 607 VALGRIND_HG_CLEAN_MEMORY((address), (size)) 608 609 610 /* ---------------------------------------------------------------- 611 TSan sources say: 612 613 Annotations useful when defining FIFO queues that transfer data 614 between threads. 615 616 All unimplemented. Am not claiming to understand this (yet). 617 ---------------------------------------------------------------- 618 */ 619 620 /* Report that the producer-consumer queue object at address PCQ has 621 been created. The ANNOTATE_PCQ_* annotations should be used only 622 for FIFO queues. For non-FIFO queues use ANNOTATE_HAPPENS_BEFORE 623 (for put) and ANNOTATE_HAPPENS_AFTER (for get). */ 624 #define ANNOTATE_PCQ_CREATE(pcq) \ 625 _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_CREATE") 626 627 /* Report that the queue at address PCQ is about to be destroyed. */ 628 #define ANNOTATE_PCQ_DESTROY(pcq) \ 629 _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_DESTROY") 630 631 /* Report that we are about to put an element into a FIFO queue at 632 address PCQ. */ 633 #define ANNOTATE_PCQ_PUT(pcq) \ 634 _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_PUT") 635 636 /* Report that we've just got an element from a FIFO queue at address 637 PCQ. */ 638 #define ANNOTATE_PCQ_GET(pcq) \ 639 _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_GET") 640 641 642 /* ---------------------------------------------------------------- 643 Annotations that suppress errors. It is usually better to express 644 the program's synchronization using the other annotations, but 645 these can be used when all else fails. 646 647 Currently these are all unimplemented. I can't think of a simple 648 way to implement them without at least some performance overhead. 649 ---------------------------------------------------------------- 650 */ 651 652 /* Report that we may have a benign race at "pointer", with size 653 "sizeof(*(pointer))". "pointer" must be a non-void* pointer. Insert at the 654 point where "pointer" has been allocated, preferably close to the point 655 where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC. 656 657 XXX: what's this actually supposed to do? And what's the type of 658 DESCRIPTION? When does the annotation stop having an effect? 659 */ 660 #define ANNOTATE_BENIGN_RACE(pointer, description) \ 661 _HG_CLIENTREQ_UNIMP("ANNOTATE_BENIGN_RACE") 662 663 /* Same as ANNOTATE_BENIGN_RACE(address, description), but applies to 664 the memory range [address, address+size). */ 665 #define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \ 666 VALGRIND_HG_DISABLE_CHECKING(address, size) 667 668 /* Request the analysis tool to ignore all reads in the current thread 669 until ANNOTATE_IGNORE_READS_END is called. Useful to ignore 670 intentional racey reads, while still checking other reads and all 671 writes. */ 672 #define ANNOTATE_IGNORE_READS_BEGIN() \ 673 _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_READS_BEGIN") 674 675 /* Stop ignoring reads. */ 676 #define ANNOTATE_IGNORE_READS_END() \ 677 _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_READS_END") 678 679 /* Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes. */ 680 #define ANNOTATE_IGNORE_WRITES_BEGIN() \ 681 _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_WRITES_BEGIN") 682 683 /* Stop ignoring writes. */ 684 #define ANNOTATE_IGNORE_WRITES_END() \ 685 _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_WRITES_END") 686 687 /* Start ignoring all memory accesses (reads and writes). */ 688 #define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \ 689 do { \ 690 ANNOTATE_IGNORE_READS_BEGIN(); \ 691 ANNOTATE_IGNORE_WRITES_BEGIN(); \ 692 } while (0) 693 694 /* Stop ignoring all memory accesses. */ 695 #define ANNOTATE_IGNORE_READS_AND_WRITES_END() \ 696 do { \ 697 ANNOTATE_IGNORE_WRITES_END(); \ 698 ANNOTATE_IGNORE_READS_END(); \ 699 } while (0) 700 701 702 /* ---------------------------------------------------------------- 703 Annotations useful for debugging. 704 705 Again, so for unimplemented, partly for performance reasons. 706 ---------------------------------------------------------------- 707 */ 708 709 /* Request to trace every access to ADDRESS. */ 710 #define ANNOTATE_TRACE_MEMORY(address) \ 711 _HG_CLIENTREQ_UNIMP("ANNOTATE_TRACE_MEMORY") 712 713 /* Report the current thread name to a race detector. */ 714 #define ANNOTATE_THREAD_NAME(name) \ 715 _HG_CLIENTREQ_UNIMP("ANNOTATE_THREAD_NAME") 716 717 718 /* ---------------------------------------------------------------- 719 Annotations for describing behaviour of user-implemented lock 720 primitives. In all cases, the LOCK argument is a completely 721 arbitrary machine word (unsigned long, or void*) and can be any 722 value which gives a unique identity to the lock objects being 723 modelled. 724 725 We just pretend they're ordinary posix rwlocks. That'll probably 726 give some rather confusing wording in error messages, claiming that 727 the arbitrary LOCK values are pthread_rwlock_t*'s, when in fact 728 they are not. Ah well. 729 ---------------------------------------------------------------- 730 */ 731 /* Report that a lock has just been created at address LOCK. */ 732 #define ANNOTATE_RWLOCK_CREATE(lock) \ 733 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_INIT_POST, \ 734 void*,(lock)) 735 736 /* Report that the lock at address LOCK is about to be destroyed. */ 737 #define ANNOTATE_RWLOCK_DESTROY(lock) \ 738 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_DESTROY_PRE, \ 739 void*,(lock)) 740 741 /* Report that the lock at address LOCK has just been acquired. 742 is_w=1 for writer lock, is_w=0 for reader lock. */ 743 #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ 744 DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_RWLOCK_ACQUIRED, \ 745 void*,(lock), unsigned long,(is_w)) 746 747 /* Report that the lock at address LOCK is about to be released. */ 748 #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ 749 DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_RELEASED, \ 750 void*,(lock)) /* is_w is ignored */ 751 752 753 /* ------------------------------------------------------------- 754 Annotations useful when implementing barriers. They are not 755 normally needed by modules that merely use barriers. 756 The "barrier" argument is a pointer to the barrier object. 757 ---------------------------------------------------------------- 758 */ 759 760 /* Report that the "barrier" has been initialized with initial 761 "count". If 'reinitialization_allowed' is true, initialization is 762 allowed to happen multiple times w/o calling barrier_destroy() */ 763 #define ANNOTATE_BARRIER_INIT(barrier, count, reinitialization_allowed) \ 764 _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_INIT") 765 766 /* Report that we are about to enter barrier_wait("barrier"). */ 767 #define ANNOTATE_BARRIER_WAIT_BEFORE(barrier) \ 768 _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") 769 770 /* Report that we just exited barrier_wait("barrier"). */ 771 #define ANNOTATE_BARRIER_WAIT_AFTER(barrier) \ 772 _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") 773 774 /* Report that the "barrier" has been destroyed. */ 775 #define ANNOTATE_BARRIER_DESTROY(barrier) \ 776 _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") 777 778 779 /* ---------------------------------------------------------------- 780 Annotations useful for testing race detectors. 781 ---------------------------------------------------------------- 782 */ 783 784 /* Report that we expect a race on the variable at ADDRESS. Use only 785 in unit tests for a race detector. */ 786 #define ANNOTATE_EXPECT_RACE(address, description) \ 787 _HG_CLIENTREQ_UNIMP("ANNOTATE_EXPECT_RACE") 788 789 /* A no-op. Insert where you like to test the interceptors. */ 790 #define ANNOTATE_NO_OP(arg) \ 791 _HG_CLIENTREQ_UNIMP("ANNOTATE_NO_OP") 792 793 /* Force the race detector to flush its state. The actual effect depends on 794 * the implementation of the detector. */ 795 #define ANNOTATE_FLUSH_STATE() \ 796 _HG_CLIENTREQ_UNIMP("ANNOTATE_FLUSH_STATE") 797 798 #endif /* __HELGRIND_H */ 799
