#include "clockvector.h"
#include "execution.h"
-SCAnalysis::SCAnalysis(const ModelExecution *execution) :
+SCAnalysis::SCAnalysis() :
cvmap(),
cyclic(false),
badrfset(),
lastwrmap(),
threadlists(1),
- execution(execution)
+ execution(NULL)
{
}
SCAnalysis::~SCAnalysis() {
}
+void SCAnalysis::setExecution(ModelExecution * execution) {
+ this->execution=execution;
+}
+
+char * SCAnalysis::name() {
+ char * name = "SC";
+ return name;
+}
+
void SCAnalysis::print_list(action_list_t *list) {
model_print("---------------------------------------------------------------------\n");
if (cyclic)
model_print("BRF ");
act->print();
if (badrfset.contains(act)) {
- model_print("Desired Rf: %u \n",badrfset.get(act)->get_seq_number());
+ model_print("Desired Rf: %u \n", badrfset.get(act)->get_seq_number());
}
}
hash = hash ^ (hash << 3) ^ ((*it)->hash());
}
void SCAnalysis::analyze(action_list_t *actions) {
- buildVectors(actions);
- computeCV(actions);
action_list_t *list = generateSC(actions);
check_rf(list);
print_list(list);
for (action_list_t::iterator it = list->begin(); it != list->end(); it++) {
const ModelAction *act = *it;
if (act->is_read()) {
- if (act->get_reads_from()!=lastwrmap.get(act->get_location()))
- badrfset.put(act,lastwrmap.get(act->get_location()));
+ if (act->get_reads_from() != lastwrmap.get(act->get_location()))
+ badrfset.put(act, lastwrmap.get(act->get_location()));
}
if (act->is_write())
lastwrmap.put(act->get_location(), act);
}
bool SCAnalysis::merge(ClockVector *cv, const ModelAction *act, const ModelAction *act2) {
- ClockVector * cv2=cvmap.get(act2);
- if (cv2==NULL)
+ ClockVector *cv2 = cvmap.get(act2);
+ if (cv2 == NULL)
return true;
if (cv2->getClock(act->get_tid()) >= act->get_seq_number() && act->get_seq_number() != 0) {
- cyclic=true;
+ cyclic = true;
//refuse to introduce cycles into clock vectors
return false;
}
return cv->merge(cv2);
}
-ModelAction * SCAnalysis::getNextAction() {
- ModelAction *act = NULL;
- /* Find the earliest in SC ordering */
- for (int i = 0; i <= maxthreads; i++) {
- action_list_t *threadlist = &threadlists[i];
- if (threadlist->empty())
+int SCAnalysis::getNextActions(ModelAction ** array) {
+ int count=0;
+
+ for (int t = 0; t <= maxthreads; t++) {
+ action_list_t *tlt = &threadlists[t];
+ if (tlt->empty())
continue;
- ModelAction *first = threadlist->front();
- if (act==NULL) {
- act = first;
+ ModelAction *act = tlt->front();
+ ClockVector *cv = cvmap.get(act);
+
+ /* Find the earliest in SC ordering */
+ for (int i = 0; i <= maxthreads; i++) {
+ if ( i == t )
+ continue;
+ action_list_t *threadlist = &threadlists[i];
+ if (threadlist->empty())
+ continue;
+ ModelAction *first = threadlist->front();
+ if (cv->synchronized_since(first)) {
+ act = NULL;
+ break;
+ }
+ }
+ if (act != NULL) {
+ array[count++]=act;
+ }
+ }
+ if (count != 0)
+ return count;
+ for (int t = 0; t <= maxthreads; t++) {
+ action_list_t *tlt = &threadlists[t];
+ if (tlt->empty())
continue;
+ ModelAction *act = tlt->front();
+ ClockVector *cv = act->get_cv();
+
+ /* Find the earliest in SC ordering */
+ for (int i = 0; i <= maxthreads; i++) {
+ if ( i == t )
+ continue;
+ action_list_t *threadlist = &threadlists[i];
+ if (threadlist->empty())
+ continue;
+ ModelAction *first = threadlist->front();
+ if (cv->synchronized_since(first)) {
+ act = NULL;
+ break;
+ }
}
- ClockVector *cv = cvmap.get(act);
- if (cv->synchronized_since(first)) {
- act = first;
+ if (act != NULL) {
+ array[count++]=act;
}
}
- if (act == NULL)
- return act;
- /* Find the model action with the earliest sequence number in case of a cycle.
- */
+ ASSERT(count==0 || cyclic);
- for (int i = 0; i <= maxthreads; i++) {
- action_list_t *threadlist = &threadlists[i];
- if (threadlist->empty())
- continue;
- ModelAction *first = threadlist->front();
- ClockVector *cvfirst = cvmap.get(first);
- if (first->get_seq_number()<act->get_seq_number()) {
- bool candidate=true;
- for (int j = 0; j <= maxthreads; j++) {
- action_list_t *threadlist2 = &threadlists[j];
- if (threadlist2->empty())
+ return count;
+}
+
+ModelAction * SCAnalysis::pruneArray(ModelAction **array,int count) {
+ /* No choice */
+ if (count == 1)
+ return array[0];
+
+ /* Choose first non-write action */
+ ModelAction *nonwrite=NULL;
+ for(int i=0;i<count;i++) {
+ if (!array[i]->is_write())
+ if (nonwrite==NULL || nonwrite->get_seq_number() > array[i]->get_seq_number())
+ nonwrite = array[i];
+ }
+ if (nonwrite != NULL)
+ return nonwrite;
+
+ /* Look for non-conflicting action */
+ ModelAction *nonconflict=NULL;
+ for(int a=0;a<count;a++) {
+ ModelAction *act=array[a];
+ for (int i = 0; i <= maxthreads && act != NULL; i++) {
+ thread_id_t tid = int_to_id(i);
+ if (tid == act->get_tid())
+ continue;
+
+ action_list_t *list = &threadlists[id_to_int(tid)];
+ for (action_list_t::iterator rit = list->begin(); rit != list->end(); rit++) {
+ ModelAction *write = *rit;
+ if (!write->is_write())
continue;
- ModelAction *check = threadlist2->front();
- if ((check!=first) &&
- cvfirst->synchronized_since(check)) {
- candidate=false;
+ ClockVector *writecv = cvmap.get(write);
+ if (writecv->synchronized_since(act))
+ break;
+ if (write->get_location() == act->get_location()) {
+ //write is sc after act
+ act = NULL;
break;
}
}
- if (candidate)
- act=first;
}
- }
-
- /* See if hb demands an earlier action. */
- for (int i = 0; i <= maxthreads; i++) {
- action_list_t *threadlist = &threadlists[i];
- if (threadlist->empty())
- continue;
- ModelAction *first = threadlist->front();
- ClockVector *cv = act->get_cv();
- if (cv->synchronized_since(first)) {
- act = first;
+ if (act != NULL) {
+ if (nonconflict == NULL || nonconflict->get_seq_number() > act->get_seq_number())
+ nonconflict=act;
}
}
- return act;
+ return nonconflict;
}
action_list_t * SCAnalysis::generateSC(action_list_t *list) {
+ int numactions=buildVectors(list);
+ computeCV(list);
+
action_list_t *sclist = new action_list_t();
+ ModelAction **array = (ModelAction **)model_calloc(1, (maxthreads + 1) * sizeof(ModelAction *));
+ int * choices = (int *) model_calloc(1, sizeof(int)*numactions);
+ int endchoice = 0;
+ int currchoice = 0;
+ int lastchoice = -1;
while (true) {
- ModelAction *act = getNextAction();
- if (act == NULL)
+ int numActions = getNextActions(array);
+ if (numActions == 0)
break;
+ ModelAction * act=pruneArray(array, numActions);
+ if (act == NULL) {
+ if (currchoice < endchoice) {
+ act = array[choices[currchoice]];
+ //check whether there is still another option
+ if ((choices[currchoice]+1)<numActions)
+ lastchoice=currchoice;
+ currchoice++;
+ } else {
+ act = array[0];
+ choices[currchoice]=0;
+ if (numActions>1)
+ lastchoice=currchoice;
+ currchoice++;
+ }
+ }
thread_id_t tid = act->get_tid();
//remove action
threadlists[id_to_int(tid)].pop_front();
//add ordering constraints from this choice
if (updateConstraints(act)) {
//propagate changes if we have them
+ bool prevc=cyclic;
computeCV(list);
+ if (!prevc && cyclic) {
+ model_print("ROLLBACK in SC\n");
+ //check whether we have another choice
+ if (lastchoice != -1) {
+ //have to reset everything
+ choices[lastchoice]++;
+ endchoice=lastchoice+1;
+ currchoice=0;
+ lastchoice=-1;
+ reset(list);
+ buildVectors(list);
+ computeCV(list);
+ sclist->clear();
+ continue;
+ }
+ }
}
//add action to end
sclist->push_back(act);
}
+ model_free(array);
return sclist;
}
-void SCAnalysis::buildVectors(action_list_t *list) {
+int SCAnalysis::buildVectors(action_list_t *list) {
maxthreads = 0;
+ int numactions = 0;
for (action_list_t::iterator it = list->begin(); it != list->end(); it++) {
ModelAction *act = *it;
+ numactions++;
int threadid = id_to_int(act->get_tid());
if (threadid > maxthreads) {
threadlists.resize(threadid + 1);
}
threadlists[threadid].push_back(act);
}
+ return numactions;
+}
+
+void SCAnalysis::reset(action_list_t *list) {
+ for (int t = 0; t <= maxthreads; t++) {
+ action_list_t *tlt = &threadlists[t];
+ tlt->clear();
+ }
+ for (action_list_t::iterator it = list->begin(); it != list->end(); it++) {
+ ModelAction *act = *it;
+ delete cvmap.get(act);
+ cvmap.put(act, NULL);
+ }
+
+ cyclic=false;
}
bool SCAnalysis::updateConstraints(ModelAction *act) {
write -rf-> R =>
write2 -sc-> write */
if (cv->synchronized_since(write2)) {
- changed |= writecv==NULL || merge(writecv, write, write2);
+ changed |= writecv == NULL || merge(writecv, write, write2);
break;
}
}
projects / model-checker.git / blobdiff