uint64_t shadowval = *shadow;
if (ISSHORTRECORD(shadowval)) {
//Do we have a non atomic write with a non-zero clock
- return ((WRITEVECTOR(shadowval) != 0) && !(ATOMICMASK & shadowval));
+ return !(ATOMICMASK & shadowval);
} else {
if (shadowval == 0)
- return false;
+ return true;
struct RaceRecord *record = (struct RaceRecord *)shadowval;
- return !record->isAtomic && record->writeClock != 0;
+ return !record->isAtomic;
}
}
if (ISSHORTRECORD(shadowval)) {
*shadow = shadowval | ATOMICMASK;
} else {
- if (shadowval == 0)
+ if (shadowval == 0) {
+ *shadow = ATOMICMASK | ENCODEOP(0, 0, 0, 0);
return;
+ }
struct RaceRecord *record = (struct RaceRecord *)shadowval;
record->isAtomic = 1;
}
void getStoreThreadAndClock(const void *address, thread_id_t * thread, modelclock_t * clock) {
uint64_t * shadow = lookupAddressEntry(address);
uint64_t shadowval = *shadow;
- if (ISSHORTRECORD(shadowval)) {
+ if (ISSHORTRECORD(shadowval) || shadowval == 0) {
//Do we have a non atomic write with a non-zero clock
*thread = WRTHREADID(shadowval);
*clock = WRITEVECTOR(shadowval);
goto Exit;
}
- if (shadowval && ATOMICMASK)
+ if (shadowval & ATOMICMASK)
return;
{
else model_free(race);
}
}
+
+void raceCheckReadOpt(thread_id_t thread, const void * addr, int bytes)
+{
+ const ModelExecution * execution = get_execution();
+ ClockVector *currClock = execution->get_cv(thread);
+ if (currClock == NULL)
+ return;
+
+ int threadid = id_to_int(thread);
+ modelclock_t ourClock = currClock->getClock(thread);
+ bool should_expand = threadid > MAXTHREADID || ourClock > MAXWRITEVECTOR;
+
+ bool hasRace = false;
+
+ for (int i = 0; i < bytes; i++) {
+ const void * location = (void *)(((uintptr_t)addr) + i);
+ uint64_t *shadow = lookupAddressEntry(location);
+ uint64_t shadowval = *shadow;
+
+ struct DataRace * race = NULL;
+
+ /* Do full record */
+ if (shadowval != 0 && !ISSHORTRECORD(shadowval)) {
+ race = fullRaceCheckRead(thread, location, shadow, currClock);
+ goto Exit;
+ }
+
+ {
+ /* Thread ID is too large or clock is too large. */
+ if (should_expand) {
+ expandRecord(shadow);
+ race = fullRaceCheckRead(thread, location, shadow, currClock);
+ goto Exit;
+ }
+
+ /* Check for datarace against last write. */
+
+ modelclock_t writeClock = WRITEVECTOR(shadowval);
+ thread_id_t writeThread = int_to_id(WRTHREADID(shadowval));
+
+ // If there is already has a race, skip check
+ if (!hasRace && clock_may_race(currClock, thread, writeClock, writeThread)) {
+ /* We have a datarace */
+ race = reportDataRace(writeThread, writeClock, true, execution->get_parent_action(thread), false, location);
+ }
+
+ modelclock_t readClock = READVECTOR(shadowval);
+ thread_id_t readThread = int_to_id(RDTHREADID(shadowval));
+
+ if (clock_may_race(currClock, thread, readClock, readThread)) {
+ /* We don't subsume this read... Have to expand record. */
+ expandRecord(shadow);
+ struct RaceRecord *record = (struct RaceRecord *) (*shadow);
+ record->thread[1] = thread;
+ record->readClock[1] = ourClock;
+ record->numReads++;
+
+ goto Exit;
+ }
+
+ *shadow = ENCODEOP(threadid, ourClock, id_to_int(writeThread), writeClock) | (shadowval & ATOMICMASK);
+ }
+Exit:
+ if (race) {
+ hasRace = true;
+ race->numframes=backtrace(race->backtrace, sizeof(race->backtrace)/sizeof(void*));
+ if (raceset->add(race))
+ assert_race(race);
+ else model_free(race);
+ }
+ }
+}