cmodelint.cc

   1 #include <stdio.h>
   2 #include <string>
   3
   4 #include "model.h"
   5 #include "execution.h"
   6 #include "action.h"
   7 #include "history.h"
   8 #include "cmodelint.h"
   9 #include "snapshot-interface.h"
  10 #include "threads-model.h"
  11 #include "datarace.h"
  12
  13 memory_order orders[7] = {
  14         memory_order_relaxed, memory_order_consume, memory_order_acquire,
  15         memory_order_release, memory_order_acq_rel, memory_order_seq_cst,
  16 };
  17
  18 static void ensureModel() {
  19         if (!model) {
  20                 snapshot_system_init(10000, 1024, 1024, 40000);
  21                 model = new ModelChecker();
  22                 model->startChecker();
  23         }
  24 }
  25
  26 /** Performs a read action.*/
  27 uint64_t model_read_action(void * obj, memory_order ord) {
  28         return model->switch_to_master(new ModelAction(ATOMIC_READ, ord, obj));
  29 }
  30
  31 /** Performs a write action.*/
  32 void model_write_action(void * obj, memory_order ord, uint64_t val) {
  33         model->switch_to_master(new ModelAction(ATOMIC_WRITE, ord, obj, val));
  34 }
  35
  36 /** Performs an init action. */
  37 void model_init_action(void * obj, uint64_t val) {
  38         model->switch_to_master(new ModelAction(ATOMIC_INIT, memory_order_relaxed, obj, val));
  39 }
  40
  41 /**
  42  * Performs the read part of a RMW action. The next action must either be the
  43  * write part of the RMW action or an explicit close out of the RMW action w/o
  44  * a write.
  45  */
  46 uint64_t model_rmwr_action(void *obj, memory_order ord) {
  47         return model->switch_to_master(new ModelAction(ATOMIC_RMWR, ord, obj));
  48 }
  49
  50 /**
  51  * Performs the read part of a RMW CAS action. The next action must
  52  * either be the write part of the RMW action or an explicit close out
  53  * of the RMW action w/o a write.
  54  */
  55 uint64_t model_rmwrcas_action(void *obj, memory_order ord, uint64_t oldval, int size) {
  56         return model->switch_to_master(new ModelAction(ATOMIC_RMWRCAS, ord, obj, oldval, size));
  57 }
  58
  59
  60 /** Performs the write part of a RMW action. */
  61 void model_rmw_action(void *obj, memory_order ord, uint64_t val) {
  62         model->switch_to_master(new ModelAction(ATOMIC_RMW, ord, obj, val));
  63 }
  64
  65 /** Closes out a RMW action without doing a write. */
  66 void model_rmwc_action(void *obj, memory_order ord) {
  67         model->switch_to_master(new ModelAction(ATOMIC_RMWC, ord, obj));
  68 }
  69
  70 /** Issues a fence operation. */
  71 void model_fence_action(memory_order ord) {
  72         model->switch_to_master(new ModelAction(ATOMIC_FENCE, ord, FENCE_LOCATION));
  73 }
  74
  75 /* ---  helper functions --- */
  76 uint64_t model_rmwrcas_action_helper(void *obj, int atomic_index, uint64_t oldval, int size, const char *position) {
  77         ensureModel();
  78         return model->switch_to_master(new ModelAction(ATOMIC_RMWRCAS, position, orders[atomic_index], obj, oldval, size));
  79 }
  80
  81 uint64_t model_rmwr_action_helper(void *obj, int atomic_index, const char *position) {
  82         ensureModel();
  83         return model->switch_to_master(new ModelAction(ATOMIC_RMWR, position, orders[atomic_index], obj));
  84 }
  85
  86 void model_rmw_action_helper(void *obj, uint64_t val, int atomic_index, const char * position) {
  87         ensureModel();
  88         model->switch_to_master(new ModelAction(ATOMIC_RMW, position, orders[atomic_index], obj, val));
  89 }
  90
  91 void model_rmwc_action_helper(void *obj, int atomic_index, const char *position) {
  92         ensureModel();
  93         model->switch_to_master(new ModelAction(ATOMIC_RMWC, position, orders[atomic_index], obj));
  94 }
  95
  96 // cds volatile loads
  97 #define VOLATILELOAD(size) \
  98         uint ## size ## _t cds_volatile_load ## size(void * obj, const char * position) { \
  99                 ensureModel();                                                      \
 100                 return (uint ## size ## _t)model->switch_to_master(new ModelAction(ATOMIC_READ, position, memory_order_relaxed, obj)); \
 101         }
 102
 103 VOLATILELOAD(8)
 104 VOLATILELOAD(16)
 105 VOLATILELOAD(32)
 106 VOLATILELOAD(64)
 107
 108 // cds volatile stores
 109 #define VOLATILESTORE(size) \
 110         void cds_volatile_store ## size (void * obj, uint ## size ## _t val, const char * position) { \
 111                 ensureModel();                                                      \
 112                 model->switch_to_master(new ModelAction(ATOMIC_WRITE, position, memory_order_relaxed, obj, (uint64_t) val)); \
 113                 *((volatile uint ## size ## _t *)obj) = val;            \
 114                 thread_id_t tid = thread_current()->get_id();           \
 115                 for(int i=0;i < size / 8;i++) {                         \
 116                         recordWrite(tid, (void *)(((char *)obj)+i));          \
 117                 }                                                       \
 118         }
 119
 120 VOLATILESTORE(8)
 121 VOLATILESTORE(16)
 122 VOLATILESTORE(32)
 123 VOLATILESTORE(64)
 124
 125 // cds atomic inits
 126 #define CDSATOMICINT(size)                                              \
 127         void cds_atomic_init ## size (void * obj, uint ## size ## _t val, const char * position) { \
 128                 ensureModel();                                                      \
 129                 model->switch_to_master(new ModelAction(ATOMIC_INIT, position, memory_order_relaxed, obj, (uint64_t) val)); \
 130                 *((volatile uint ## size ## _t *)obj) = val;                                 \
 131                 thread_id_t tid = thread_current()->get_id();           \
 132                 for(int i=0;i < size / 8;i++) {                       \
 133                         recordWrite(tid, (void *)(((char *)obj)+i));          \
 134                 }                                                       \
 135         }
 136
 137 CDSATOMICINT(8)
 138 CDSATOMICINT(16)
 139 CDSATOMICINT(32)
 140 CDSATOMICINT(64)
 141
 142 // cds atomic loads
 143 #define CDSATOMICLOAD(size)                                             \
 144         uint ## size ## _t cds_atomic_load ## size(void * obj, int atomic_index, const char * position) { \
 145                 ensureModel();                                                      \
 146                 return (uint ## size ## _t)model->switch_to_master( \
 147                         new ModelAction(ATOMIC_READ, position, orders[atomic_index], obj)); \
 148         }
 149
 150 CDSATOMICLOAD(8)
 151 CDSATOMICLOAD(16)
 152 CDSATOMICLOAD(32)
 153 CDSATOMICLOAD(64)
 154
 155 // cds atomic stores
 156 #define CDSATOMICSTORE(size)                                            \
 157         void cds_atomic_store ## size(void * obj, uint ## size ## _t val, int atomic_index, const char * position) { \
 158                 ensureModel();                                                        \
 159                 model->switch_to_master(new ModelAction(ATOMIC_WRITE, position, orders[atomic_index], obj, (uint64_t) val)); \
 160                 *((volatile uint ## size ## _t *)obj) = val;                     \
 161                 thread_id_t tid = thread_current()->get_id();           \
 162                 for(int i=0;i < size / 8;i++) {                       \
 163                         recordWrite(tid, (void *)(((char *)obj)+i));          \
 164                 }                                                       \
 165         }
 166
 167 CDSATOMICSTORE(8)
 168 CDSATOMICSTORE(16)
 169 CDSATOMICSTORE(32)
 170 CDSATOMICSTORE(64)
 171
 172
 173 #define _ATOMIC_RMW_(__op__, size, addr, val, atomic_index, position)            \
 174         ({                                                                      \
 175                 uint ## size ## _t _old = model_rmwr_action_helper(addr, atomic_index, position);   \
 176                 uint ## size ## _t _copy = _old;                                          \
 177                 uint ## size ## _t _val = val;                                            \
 178                 _copy __op__ _val;                                                    \
 179                 model_rmw_action_helper(addr, (uint64_t) _copy, atomic_index, position);        \
 180                 *((volatile uint ## size ## _t *)addr) = _copy;                  \
 181                 thread_id_t tid = thread_current()->get_id();           \
 182                 for(int i=0;i < size / 8;i++) {                       \
 183                         recordWrite(tid, (void *)(((char *)addr)+i));         \
 184                 }                                                       \
 185                 return _old;                                                          \
 186         })
 187
 188 // cds atomic exchange
 189 #define CDSATOMICEXCHANGE(size)                                         \
 190         uint ## size ## _t cds_atomic_exchange ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 191                 _ATOMIC_RMW_( =, size, addr, val, atomic_index, position);          \
 192         }
 193
 194 CDSATOMICEXCHANGE(8)
 195 CDSATOMICEXCHANGE(16)
 196 CDSATOMICEXCHANGE(32)
 197 CDSATOMICEXCHANGE(64)
 198
 199 // cds atomic fetch add
 200 #define CDSATOMICADD(size)                                              \
 201         uint ## size ## _t cds_atomic_fetch_add ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 202                 _ATOMIC_RMW_( +=, size, addr, val, atomic_index, position);         \
 203         }
 204
 205 CDSATOMICADD(8)
 206 CDSATOMICADD(16)
 207 CDSATOMICADD(32)
 208 CDSATOMICADD(64)
 209
 210 // cds atomic fetch sub
 211 #define CDSATOMICSUB(size)                                              \
 212         uint ## size ## _t cds_atomic_fetch_sub ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 213                 _ATOMIC_RMW_( -=, size, addr, val, atomic_index, position);         \
 214         }
 215
 216 CDSATOMICSUB(8)
 217 CDSATOMICSUB(16)
 218 CDSATOMICSUB(32)
 219 CDSATOMICSUB(64)
 220
 221 // cds atomic fetch and
 222 #define CDSATOMICAND(size)                                              \
 223         uint ## size ## _t cds_atomic_fetch_and ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 224                 _ATOMIC_RMW_( &=, size, addr, val, atomic_index, position);         \
 225         }
 226
 227 CDSATOMICAND(8)
 228 CDSATOMICAND(16)
 229 CDSATOMICAND(32)
 230 CDSATOMICAND(64)
 231
 232 // cds atomic fetch or
 233 #define CDSATOMICOR(size)                                               \
 234         uint ## size ## _t cds_atomic_fetch_or ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 235                 _ATOMIC_RMW_( |=, size, addr, val, atomic_index, position);         \
 236         }
 237
 238 CDSATOMICOR(8)
 239 CDSATOMICOR(16)
 240 CDSATOMICOR(32)
 241 CDSATOMICOR(64)
 242
 243 // cds atomic fetch xor
 244 #define CDSATOMICXOR(size)                                              \
 245         uint ## size ## _t cds_atomic_fetch_xor ## size(void* addr, uint ## size ## _t val, int atomic_index, const char * position) { \
 246                 _ATOMIC_RMW_( ^=, size, addr, val, atomic_index, position);         \
 247         }
 248
 249 CDSATOMICXOR(8)
 250 CDSATOMICXOR(16)
 251 CDSATOMICXOR(32)
 252 CDSATOMICXOR(64)
 253
 254 // cds atomic compare and exchange
 255 // In order to accomodate the LLVM PASS, the return values are not true or false.
 256
 257 #define _ATOMIC_CMPSWP_WEAK_ _ATOMIC_CMPSWP_
 258 #define _ATOMIC_CMPSWP_(size, addr, expected, desired, atomic_index, position)                            \
 259         ({                                                                                              \
 260                 uint ## size ## _t _desired = desired;                                                            \
 261                 uint ## size ## _t _expected = expected;                                                          \
 262                 uint ## size ## _t _old = model_rmwrcas_action_helper(addr, atomic_index, _expected, sizeof(_expected), position); \
 263                 if (_old == _expected) {                                                                    \
 264                         model_rmw_action_helper(addr, (uint64_t) _desired, atomic_index, position); \
 265                         *((volatile uint ## size ## _t *)addr) = desired;                        \
 266                         thread_id_t tid = thread_current()->get_id();           \
 267                         for(int i=0;i < size / 8;i++) {                       \
 268                                 recordWrite(tid, (void *)(((char *)addr)+i));         \
 269                         }                                                       \
 270                         return _expected; }                                     \
 271                 else {                                                                                        \
 272                         model_rmwc_action_helper(addr, atomic_index, position); _expected = _old; return _old; }              \
 273         })
 274
 275 // atomic_compare_exchange version 1: the CmpOperand (corresponds to expected)
 276 // extracted from LLVM IR is an integer type.
 277 #define CDSATOMICCASV1(size)                                            \
 278         uint ## size ## _t cds_atomic_compare_exchange ## size ## _v1(void* addr, uint ## size ## _t expected, uint ## size ## _t desired, int atomic_index_succ, int atomic_index_fail, const char *position) { \
 279                 _ATOMIC_CMPSWP_(size, addr, expected, desired, atomic_index_succ, position); \
 280         }
 281
 282 CDSATOMICCASV1(8)
 283 CDSATOMICCASV1(16)
 284 CDSATOMICCASV1(32)
 285 CDSATOMICCASV1(64)
 286
 287 // atomic_compare_exchange version 2
 288 #define CDSATOMICCASV2(size)                                            \
 289         bool cds_atomic_compare_exchange ## size ## _v2(void* addr, uint ## size ## _t* expected, uint ## size ## _t desired, int atomic_index_succ, int atomic_index_fail, const char *position) { \
 290                 uint ## size ## _t ret = cds_atomic_compare_exchange ## size ## _v1(addr, *expected, desired, atomic_index_succ, atomic_index_fail, position); \
 291                 if (ret == *expected) {return true;} else {return false;}               \
 292         }
 293
 294 CDSATOMICCASV2(8)
 295 CDSATOMICCASV2(16)
 296 CDSATOMICCASV2(32)
 297 CDSATOMICCASV2(64)
 298
 299 // cds atomic thread fence
 300
 301 void cds_atomic_thread_fence(int atomic_index, const char * position) {
 302         model->switch_to_master(
 303                 new ModelAction(ATOMIC_FENCE, position, orders[atomic_index], FENCE_LOCATION)
 304                 );
 305 }
 306
 307 /*
 308  #define _ATOMIC_CMPSWP_( __a__, __e__, __m__, __x__ )                         \
 309         ({ volatile __typeof__((__a__)->__f__)* __p__ = & ((__a__)->__f__);   \
 310                 __typeof__(__e__) __q__ = (__e__);                            \
 311                 __typeof__(__m__) __v__ = (__m__);                            \
 312                 bool __r__;                                                   \
 313                 __typeof__((__a__)->__f__) __t__=(__typeof__((__a__)->__f__)) model_rmwr_action((void *)__p__, __x__); \
 314                 if (__t__ == * __q__ ) {                                      \
 315                         model_rmw_action((void *)__p__, __x__, (uint64_t) __v__); __r__ = true; } \
 316                 else {  model_rmwc_action((void *)__p__, __x__); *__q__ = __t__;  __r__ = false;} \
 317                 __r__; })
 318
 319  #define _ATOMIC_FENCE_( __x__ ) \
 320         ({ model_fence_action(__x__);})
 321  */
 322
 323 /*
 324
 325  #define _ATOMIC_MODIFY_( __a__, __o__, __m__, __x__ )                         \
 326         ({ volatile __typeof__((__a__)->__f__)* __p__ = & ((__a__)->__f__);   \
 327         __typeof__((__a__)->__f__) __old__=(__typeof__((__a__)->__f__)) model_rmwr_action((void *)__p__, __x__); \
 328         __typeof__(__m__) __v__ = (__m__);                                    \
 329         __typeof__((__a__)->__f__) __copy__= __old__;                         \
 330         __copy__ __o__ __v__;                                                 \
 331         model_rmw_action((void *)__p__, __x__, (uint64_t) __copy__);          \
 332         __old__ = __old__;  Silence clang (-Wunused-value)                    \
 333          })
 334  */
 335
 336 void cds_func_entry(const char * funcName) {
 337         ensureModel();
 338         Thread * th = thread_current();
 339         uint32_t func_id;
 340
 341         ModelHistory *history = model->get_history();
 342         if ( !history->getFuncMap()->contains(funcName) ) {
 343                 // add func id to func map
 344                 func_id = history->get_func_counter();
 345                 history->incr_func_counter();
 346                 history->getFuncMap()->put(funcName, func_id);
 347
 348                 // add func id to reverse func map
 349                 ModelVector<const char *> * func_map_rev = history->getFuncMapRev();
 350                 if ( func_map_rev->size() <= func_id )
 351                         func_map_rev->resize( func_id + 1 );
 352                 func_map_rev->at(func_id) = funcName;
 353         } else {
 354                 func_id = history->getFuncMap()->get(funcName);
 355         }
 356
 357         history->enter_function(func_id, th->get_id());
 358 }
 359
 360 void cds_func_exit(const char * funcName) {
 361         ensureModel();
 362         Thread * th = thread_current();
 363         uint32_t func_id;
 364
 365         ModelHistory *history = model->get_history();
 366         func_id = history->getFuncMap()->get(funcName);
 367
 368         /* func_id not found; this could happen in the case where a function calls cds_func_entry
 369          * when the model has been defined yet, but then an atomic inside the function initializes
 370          * the model. And then cds_func_exit is called upon the function exiting.
 371          */
 372         if (func_id == 0)
 373                 return;
 374
 375         history->exit_function(func_id, th->get_id());
 376 }