+++ /dev/null
-#include "scanalysis.h"
-#include "action.h"
-#include "threads-model.h"
-#include "clockvector.h"
-#include "execution.h"
-#include <sys/time.h>
-
-
-SCAnalysis::SCAnalysis() :
- cvmap(),
- cyclic(false),
- badrfset(),
- lastwrmap(),
- threadlists(1),
- execution(NULL),
- print_always(false),
- print_buggy(true),
- print_nonsc(false),
- time(false),
- stats((struct sc_statistics *)model_calloc(1, sizeof(struct sc_statistics)))
-{
-}
-
-SCAnalysis::~SCAnalysis() {
- delete(stats);
-}
-
-void SCAnalysis::setExecution(ModelExecution * execution) {
- this->execution=execution;
-}
-
-const char * SCAnalysis::name() {
- const char * name = "SC";
- return name;
-}
-
-void SCAnalysis::finish() {
- if (time)
- model_print("Elapsed time in usec %llu\n", stats->elapsedtime);
- model_print("SC count: %u\n", stats->sccount);
- model_print("Non-SC count: %u\n", stats->nonsccount);
- model_print("Total actions: %llu\n", stats->actions);
- unsigned long long actionperexec=(stats->actions)/(stats->sccount+stats->nonsccount);
- model_print("Actions per execution: %llu\n", actionperexec);
-}
-
-bool SCAnalysis::option(char * opt) {
- if (strcmp(opt, "verbose")==0) {
- print_always=true;
- return false;
- } else if (strcmp(opt, "buggy")==0) {
- return false;
- } else if (strcmp(opt, "quiet")==0) {
- print_buggy=false;
- return false;
- } else if (strcmp(opt, "nonsc")==0) {
- print_nonsc=true;
- return false;
- } else if (strcmp(opt, "time")==0) {
- time=true;
- return false;
- } else if (strcmp(opt, "help") != 0) {
- model_print("Unrecognized option: %s\n", opt);
- }
-
- model_print("SC Analysis options\n");
- model_print("verbose -- print all feasible executions\n");
- model_print("buggy -- print only buggy executions (default)\n");
- model_print("nonsc -- print non-sc execution\n");
- model_print("quiet -- print nothing\n");
- model_print("time -- time execution of scanalysis\n");
- model_print("\n");
-
- return true;
-}
-
-void SCAnalysis::print_list(action_list_t *list) {
- model_print("---------------------------------------------------------------------\n");
- if (cyclic)
- model_print("Not SC\n");
- unsigned int hash = 0;
-
- for (action_list_t::iterator it = list->begin(); it != list->end(); it++) {
- const ModelAction *act = *it;
- if (act->get_seq_number() > 0) {
- if (badrfset.contains(act))
- model_print("BRF ");
- act->print();
- if (badrfset.contains(act)) {
- model_print("Desired Rf: %u \n", badrfset.get(act)->get_seq_number());
- }
- }
- hash = hash ^ (hash << 3) ^ ((*it)->hash());
- }
- model_print("HASH %u\n", hash);
- model_print("---------------------------------------------------------------------\n");
-}
-
-void SCAnalysis::analyze(action_list_t *actions) {
-
- struct timeval start;
- struct timeval finish;
- if (time)
- gettimeofday(&start, NULL);
- action_list_t *list = generateSC(actions);
- check_rf(list);
- if (print_always || (print_buggy && execution->have_bug_reports())|| (print_nonsc && cyclic))
- print_list(list);
- if (time) {
- gettimeofday(&finish, NULL);
- stats->elapsedtime+=((finish.tv_sec*1000000+finish.tv_usec)-(start.tv_sec*1000000+start.tv_usec));
- }
- update_stats();
-}
-
-void SCAnalysis::update_stats() {
- if (cyclic) {
- stats->nonsccount++;
- } else {
- stats->sccount++;
- }
-}
-
-void SCAnalysis::check_rf(action_list_t *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->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)
- return true;
- if (cv2->getClock(act->get_tid()) >= act->get_seq_number() && act->get_seq_number() != 0) {
- cyclic = true;
- //refuse to introduce cycles into clock vectors
- return false;
- }
-
- return cv->merge(cv2);
-}
-
-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 *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;
- }
- }
- if (act != NULL) {
- array[count++]=act;
- }
- }
-
- ASSERT(count==0 || cyclic);
-
- 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;
- 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 (act != NULL) {
- if (nonconflict == NULL || nonconflict->get_seq_number() > act->get_seq_number())
- nonconflict=act;
- }
- }
- return nonconflict;
-}
-
-action_list_t * SCAnalysis::generateSC(action_list_t *list) {
- int numactions=buildVectors(list);
- stats->actions+=numactions;
-
- 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) {
- 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;
-}
-
-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);
- maxthreads = threadid;
- }
- 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) {
- bool changed = false;
- for (int i = 0; i <= maxthreads; 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;
- ClockVector *writecv = cvmap.get(write);
- if (writecv->synchronized_since(act))
- break;
- if (write->get_location() == act->get_location()) {
- //write is sc after act
- merge(writecv, write, act);
- changed = true;
- break;
- }
- }
- }
- return changed;
-}
-
-bool SCAnalysis::processRead(ModelAction *read, ClockVector *cv) {
- bool changed = false;
-
- /* Merge in the clock vector from the write */
- const ModelAction *write = read->get_reads_from();
- ClockVector *writecv = cvmap.get(write);
- changed |= merge(cv, read, write) && (*read < *write);
-
- for (int i = 0; i <= maxthreads; i++) {
- thread_id_t tid = int_to_id(i);
- if (tid == read->get_tid())
- continue;
- if (tid == write->get_tid())
- continue;
- action_list_t *list = execution->get_actions_on_obj(read->get_location(), tid);
- if (list == NULL)
- continue;
- for (action_list_t::reverse_iterator rit = list->rbegin(); rit != list->rend(); rit++) {
- ModelAction *write2 = *rit;
- if (!write2->is_write())
- continue;
-
- ClockVector *write2cv = cvmap.get(write2);
- if (write2cv == NULL)
- continue;
-
- /* write -sc-> write2 &&
- write -rf-> R =>
- R -sc-> write2 */
- if (write2cv->synchronized_since(write)) {
- changed |= merge(write2cv, write2, read);
- }
-
- //looking for earliest write2 in iteration to satisfy this
- /* write2 -sc-> R &&
- write -rf-> R =>
- write2 -sc-> write */
- if (cv->synchronized_since(write2)) {
- changed |= writecv == NULL || merge(writecv, write, write2);
- break;
- }
- }
- }
- return changed;
-}
-
-void SCAnalysis::computeCV(action_list_t *list) {
- bool changed = true;
- bool firsttime = true;
- ModelAction **last_act = (ModelAction **)model_calloc(1, (maxthreads + 1) * sizeof(ModelAction *));
- while (changed) {
- changed = changed&firsttime;
- firsttime = false;
-
- for (action_list_t::iterator it = list->begin(); it != list->end(); it++) {
- ModelAction *act = *it;
- ModelAction *lastact = last_act[id_to_int(act->get_tid())];
- if (act->is_thread_start())
- lastact = execution->get_thread(act)->get_creation();
- last_act[id_to_int(act->get_tid())] = act;
- ClockVector *cv = cvmap.get(act);
- if (cv == NULL) {
- cv = new ClockVector(NULL, act);
- cvmap.put(act, cv);
- }
- if (lastact != NULL) {
- merge(cv, act, lastact);
- }
- if (act->is_thread_join()) {
- Thread *joinedthr = act->get_thread_operand();
- ModelAction *finish = execution->get_last_action(joinedthr->get_id());
- changed |= merge(cv, act, finish);
- }
- if (act->is_read()) {
- changed |= processRead(act, cv);
- }
- }
- /* Reset the last action array */
- if (changed) {
- bzero(last_act, (maxthreads + 1) * sizeof(ModelAction *));
- }
- }
- model_free(last_act);
-}
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