#include "datarace.h"
-#include "threads.h"
+#include "model.h"
+#include "threads-model.h"
#include <stdio.h>
#include <cstring>
+#include "mymemory.h"
+#include "clockvector.h"
+#include "config.h"
struct ShadowTable *root;
+std::vector<struct DataRace *> unrealizedraces;
+void *memory_base;
+void *memory_top;
+
+/** This function initialized the data race detector. */
void initRaceDetector() {
- root=(struct ShadowTable *) calloc(sizeof(struct ShadowTable),1);
+ root = (struct ShadowTable *)snapshot_calloc(sizeof(struct ShadowTable), 1);
+ memory_base = snapshot_calloc(sizeof(struct ShadowBaseTable)*SHADOWBASETABLES, 1);
+ memory_top = ((char *)memory_base) + sizeof(struct ShadowBaseTable)*SHADOWBASETABLES;
}
-static uint64_t * lookupAddressEntry(void * address) {
+void * table_calloc(size_t size) {
+ if ((((char *)memory_base)+size)>memory_top) {
+ return snapshot_calloc(size, 1);
+ } else {
+ void *tmp=memory_base;
+ memory_base=((char *)memory_base)+size;
+ return tmp;
+ }
+}
+
+/** This function looks up the entry in the shadow table corresponding to a
+ * given address.*/
+static uint64_t * lookupAddressEntry(const void * address) {
struct ShadowTable *currtable=root;
-#ifdef BIT48
- currtable=(struct ShadowTable *) currtable->array[(((uintptr_t)address)>>32)&0xffff];
+#if BIT48
+ currtable=(struct ShadowTable *) currtable->array[(((uintptr_t)address)>>32)&MASK16BIT];
if (currtable==NULL) {
- currtable=(struct ShadowTable *) (root->array[(((uintptr_t)address)>>32)&MASK16BIT]=calloc(sizeof(struct ShadowTable),1));
+ currtable = (struct ShadowTable *)(root->array[(((uintptr_t)address)>>32)&MASK16BIT] = table_calloc(sizeof(struct ShadowTable)));
}
#endif
struct ShadowBaseTable * basetable=(struct ShadowBaseTable *) currtable->array[(((uintptr_t)address)>>16)&MASK16BIT];
if (basetable==NULL) {
- basetable=(struct ShadowBaseTable *) (currtable->array[(((uintptr_t)address)>>16)&MASK16BIT]=calloc(sizeof(struct ShadowBaseTable),1));
+ basetable = (struct ShadowBaseTable *)(currtable->array[(((uintptr_t)address)>>16)&MASK16BIT] = table_calloc(sizeof(struct ShadowBaseTable)));
}
return &basetable->array[((uintptr_t)address)&MASK16BIT];
}
return tid1 != tid2 && clock2 != 0 && clock1->getClock(tid2) <= clock2;
}
+/**
+ * Expands a record from the compact form to the full form. This is
+ * necessary for multiple readers or for very large thread ids or time
+ * stamps. */
static void expandRecord(uint64_t * shadow) {
uint64_t shadowval=*shadow;
modelclock_t writeClock = WRITEVECTOR(shadowval);
thread_id_t writeThread = int_to_id(WRTHREADID(shadowval));
- struct RaceRecord * record=(struct RaceRecord *)calloc(1,sizeof(struct RaceRecord));
+ struct RaceRecord *record = (struct RaceRecord *)snapshot_calloc(1, sizeof(struct RaceRecord));
record->writeThread=writeThread;
record->writeClock=writeClock;
if (readClock!=0) {
record->capacity=INITCAPACITY;
- record->thread=(thread_id_t *) malloc(sizeof(thread_id_t)*record->capacity);
- record->readClock=(modelclock_t *) malloc(sizeof(modelclock_t)*record->capacity);
+ record->thread = (thread_id_t *)snapshot_malloc(sizeof(thread_id_t)*record->capacity);
+ record->readClock = (modelclock_t *)snapshot_malloc(sizeof(modelclock_t)*record->capacity);
record->numReads=1;
record->thread[0]=readThread;
record->readClock[0]=readClock;
*shadow=(uint64_t) record;
}
-static void reportDataRace() {
- printf("The reportDataRace method should report useful things about this datarace!\n");
+/** This function is called when we detect a data race.*/
+static void reportDataRace(thread_id_t oldthread, modelclock_t oldclock, bool isoldwrite, ModelAction *newaction, bool isnewwrite, const void *address) {
+ struct DataRace *race = (struct DataRace *)snapshot_malloc(sizeof(struct DataRace));
+ race->oldthread=oldthread;
+ race->oldclock=oldclock;
+ race->isoldwrite=isoldwrite;
+ race->newaction=newaction;
+ race->isnewwrite=isnewwrite;
+ race->address=address;
+ unrealizedraces.push_back(race);
+
+ /* If the race is realized, bail out now. */
+ if (checkDataRaces())
+ model->switch_to_master(NULL);
+}
+
+/**
+ * @brief Check and report data races
+ *
+ * If the trace is feasible (a feasible prefix), clear out the list of
+ * unrealized data races, asserting any realized ones as execution bugs so that
+ * the model-checker will end the execution.
+ *
+ * @return True if any data races were realized
+ */
+bool checkDataRaces() {
+ if (model->isfeasibleprefix()) {
+ bool race_asserted = false;
+ /* Prune the non-racing unrealized dataraces */
+ for (unsigned i = 0; i < unrealizedraces.size(); i++) {
+ struct DataRace *race = unrealizedraces[i];
+ if (clock_may_race(race->newaction->get_cv(), race->newaction->get_tid(), race->oldclock, race->oldthread)) {
+ assert_race(race);
+ race_asserted = true;
+ }
+ snapshot_free(race);
+ }
+ unrealizedraces.clear();
+ return race_asserted;
+ }
+ return false;
+}
+
+/**
+ * @brief Assert a data race
+ *
+ * Asserts a data race which is currently realized, causing the execution to
+ * end and stashing a message in the model-checker's bug list
+ *
+ * @param race The race to report
+ */
+void assert_race(struct DataRace *race)
+{
+ char buf[200];
+ char *ptr = buf;
+ ptr += sprintf(ptr, "Data race detected @ address %p:\n", race->address);
+ ptr += sprintf(ptr, " Access 1: %5s in thread %2d @ clock %3u\n",
+ race->isoldwrite ? "write" : "read",
+ id_to_int(race->oldthread), race->oldclock);
+ ptr += sprintf(ptr, " Access 2: %5s in thread %2d @ clock %3u",
+ race->isnewwrite ? "write" : "read",
+ id_to_int(race->newaction->get_tid()), race->newaction->get_seq_number());
+ model->assert_bug(buf);
}
-void fullRaceCheckWrite(thread_id_t thread, uint64_t * shadow, ClockVector *currClock) {
+/** This function does race detection for a write on an expanded record. */
+void fullRaceCheckWrite(thread_id_t thread, void *location, uint64_t * shadow, ClockVector *currClock) {
struct RaceRecord * record=(struct RaceRecord *) (*shadow);
/* Check for datarace against last read. */
if (clock_may_race(currClock, thread, readClock, readThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(readThread, readClock, false, model->get_parent_action(thread), true, location);
}
}
if (clock_may_race(currClock, thread, writeClock, writeThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(writeThread, writeClock, true, model->get_parent_action(thread), true, location);
}
record->numReads=0;
record->writeClock=ourClock;
}
+/** This function does race detection on a write. */
void raceCheckWrite(thread_id_t thread, void *location, ClockVector *currClock) {
uint64_t * shadow=lookupAddressEntry(location);
uint64_t shadowval=*shadow;
/* Do full record */
if (shadowval!=0&&!ISSHORTRECORD(shadowval)) {
- fullRaceCheckWrite(thread, shadow, currClock);
+ fullRaceCheckWrite(thread, location, shadow, currClock);
return;
}
/* Thread ID is too large or clock is too large. */
if (threadid > MAXTHREADID || ourClock > MAXWRITEVECTOR) {
expandRecord(shadow);
- fullRaceCheckWrite(thread, shadow, currClock);
+ fullRaceCheckWrite(thread, location, shadow, currClock);
return;
}
if (clock_may_race(currClock, thread, readClock, readThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(readThread, readClock, false, model->get_parent_action(thread), true, location);
}
/* Check for datarace against last write. */
if (clock_may_race(currClock, thread, writeClock, writeThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(writeThread, writeClock, true, model->get_parent_action(thread), true, location);
}
*shadow = ENCODEOP(0, 0, threadid, ourClock);
}
-void fullRaceCheckRead(thread_id_t thread, uint64_t * shadow, ClockVector *currClock) {
+/** This function does race detection on a read for an expanded record. */
+void fullRaceCheckRead(thread_id_t thread, const void *location, uint64_t * shadow, ClockVector *currClock) {
struct RaceRecord * record=(struct RaceRecord *) (*shadow);
/* Check for datarace against last write. */
if (clock_may_race(currClock, thread, writeClock, writeThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(writeThread, writeClock, true, model->get_parent_action(thread), false, location);
}
/* Shorten vector when possible */
if (copytoindex>=record->capacity) {
int newCapacity=record->capacity*2;
- thread_id_t *newthread=(thread_id_t *) malloc(sizeof(thread_id_t)*newCapacity);
- modelclock_t * newreadClock=(modelclock_t *) malloc(sizeof(modelclock_t)*newCapacity);
+ thread_id_t *newthread = (thread_id_t *)snapshot_malloc(sizeof(thread_id_t)*newCapacity);
+ modelclock_t *newreadClock =( modelclock_t *)snapshot_malloc(sizeof(modelclock_t)*newCapacity);
std::memcpy(newthread, record->thread, record->capacity*sizeof(thread_id_t));
std::memcpy(newreadClock, record->readClock, record->capacity*sizeof(modelclock_t));
- free(record->readClock);
- free(record->thread);
+ snapshot_free(record->readClock);
+ snapshot_free(record->thread);
record->readClock=newreadClock;
record->thread=newthread;
record->capacity=newCapacity;
record->numReads=copytoindex+1;
}
-void raceCheckRead(thread_id_t thread, void *location, ClockVector *currClock) {
+/** This function does race detection on a read. */
+void raceCheckRead(thread_id_t thread, const void *location, ClockVector *currClock) {
uint64_t * shadow=lookupAddressEntry(location);
uint64_t shadowval=*shadow;
/* Do full record */
if (shadowval!=0&&!ISSHORTRECORD(shadowval)) {
- fullRaceCheckRead(thread, shadow, currClock);
+ fullRaceCheckRead(thread, location, shadow, currClock);
return;
}
/* Thread ID is too large or clock is too large. */
if (threadid > MAXTHREADID || ourClock > MAXWRITEVECTOR) {
expandRecord(shadow);
- fullRaceCheckRead(thread, shadow, currClock);
+ fullRaceCheckRead(thread, location, shadow, currClock);
return;
}
if (clock_may_race(currClock, thread, writeClock, writeThread)) {
/* We have a datarace */
- reportDataRace();
+ reportDataRace(writeThread, writeClock, true, model->get_parent_action(thread), false, location);
}
modelclock_t readClock = READVECTOR(shadowval);
if (clock_may_race(currClock, thread, readClock, readThread)) {
/* We don't subsume this read... Have to expand record. */
expandRecord(shadow);
- fullRaceCheckRead(thread, shadow, currClock);
+ fullRaceCheckRead(thread, location, shadow, currClock);
return;
}
- *shadow = ENCODEOP(writeThread, writeClock, threadid, ourClock);
+ *shadow = ENCODEOP(threadid, ourClock, id_to_int(writeThread), writeClock);
}
projects / c11tester.git / blobdiff