V3MPDRCube* const V3VrfMPDR::recursiveBlockCube(V3MPDRCube* const badCube) { // Create a Queue for Blocking Cubes V3BucketList<V3MPDRCube*> badQueue(getPDRFrame()); assert (badCube); badQueue.add(getPDRDepth(), badCube); // Block Cubes from the Queue V3MPDRTimedCube baseCube, generalizedCube; while (badQueue.pop(baseCube.first, baseCube.second)) { assert (baseCube.first < getPDRFrame()); if (!baseCube.first) { // Clear All Cubes in badQueue before Return V3Set<const V3MPDRCube*>::Set traceCubes; traceCubes.clear(); const V3MPDRCube* traceCube = baseCube.second; while (true) { traceCubes.insert(traceCube); if (_pdrBad == traceCube) break; traceCube = traceCube->getNextCube(); } while (badQueue.pop(generalizedCube.first, generalizedCube.second)) { if (traceCubes.end() == traceCubes.find(generalizedCube.second)) delete generalizedCube.second; } return baseCube.second; // A Cube cannot be blocked by R0 --> Cex } if (!isBlocked(baseCube)) { assert (!existInitial(baseCube.second->getState())); // Check Reachability : SAT (R ^ ~cube ^ T ^ cube') if (checkReachability(baseCube.first, baseCube.second->getState())) { // SAT, Not Blocked Yet if (profileON()) _ternaryStat->start(); generalizedCube.second = extractModel(baseCube.second, baseCube.first - 1); if (profileON()) _ternaryStat->end(); badQueue.add(baseCube.first - 1, generalizedCube.second); // This Cube should be blocked in previous frame badQueue.add(baseCube.first, baseCube.second); // This Cube has not yet been blocked (postpone to future) } else { // UNSAT, Blocked bool satGen = true; while (true) { if (profileON()) _generalStat->start(); generalizedCube.first = baseCube.first; generalizedCube.second = new V3MPDRCube(*(baseCube.second)); generalization(generalizedCube); // Generalization if (profileON()) _generalStat->end(); addBlockedCube(generalizedCube); // Record this Cube that is bad and to be blocked // I found Niklas Een has modified the original IWLS paper and alter the line below // However, I suggest the alteration restricts PDR (i.e. fold-free) and does not help if (satGen && (baseCube.first < getPDRDepth()) && (generalizedCube.first < getPDRFrame())) badQueue.add(baseCube.first + 1, baseCube.second); //if ((baseCube.first < getPDRDepth()) && (generalizedCube.first < getPDRDepth())) // badQueue.add(generalizedCube.first + 1, baseCube.second); if (!isForwardSATGen() || getPDRDepth() <= generalizedCube.first) break; baseCube.second = forwardModel(generalizedCube.second); if (!baseCube.second) break; baseCube.first = baseCube.first + 1; satGen = false; if (checkReachability(baseCube.first, baseCube.second->getState())) break; } } } //else delete baseCube.second; } return 0; }
V3SIPDRCube* const V3SVrfIPDR::recursiveBlockCube2(V3SIPDRCube* const badCube) { //unfolding_depth uint32_t d = _decompDepth; //cerr << "_decompDepth : " << d << endl; if(heavy_debug) cerr << "\n\n\nrecursiveBlockCube2\n"; // Create a Queue for Blocking Cubes V3BucketList<V3SIPDRCube*> badQueue(getPDRFrame()); assert (badCube); badQueue.add(getPDRDepth(), badCube); vector<uint32_t> v; for (unsigned i = 0; i <= getPDRDepth(); ++i){ v.push_back(0); } // Block Cubes from the Queue V3SIPDRTimedCube baseCube, generalizedCube; while (badQueue.pop(baseCube.first, baseCube.second)) { v[baseCube.first]++; if(heavy_debug){ cerr << "\nPoped: baseCube frame: " << baseCube.first << ", cube: "; printState( baseCube.second->getState() ); } assert (baseCube.first < getPDRFrame()); if (!baseCube.first) { // Clear All Cubes in badQueue before Return V3Set<const V3SIPDRCube*>::Set traceCubes; traceCubes.clear(); const V3SIPDRCube* traceCube = baseCube.second; while (true) { traceCubes.insert(traceCube); if (_pdrBad == traceCube) break; traceCube = traceCube->getNextCube(); } while (badQueue.pop(generalizedCube.first, generalizedCube.second)) { if (traceCubes.end() == traceCubes.find(generalizedCube.second)) delete generalizedCube.second; } return baseCube.second; // A Cube cannot be blocked by R0 --> Cex } if (!isBlocked(baseCube)) { assert (!existInitial2(baseCube.second->getState())); // Check Reachability : SAT (R ^ ~cube ^ T ^ cube') if( baseCube.first >= d && v[baseCube.first] > 10){ //if( false ){ if(checkReachability2(baseCube.first - d + 1, baseCube.second->getState(),false)){ if(heavy_debug){ cerr << "SAT, generalizing... Frame before gen:" << baseCube.first << " Cube before gen:"; printState(baseCube.second->getState()); } if (profileON()) _ternaryStat->start(); generalizedCube.second = extractModel2(baseCube.first - d, baseCube.second); if (profileON()) _ternaryStat->end(); if(heavy_debug){ cerr << "SAT, pushing to queue, Frame after gen:" << baseCube.first-d << " Cube after gen:"; printState(generalizedCube.second->getState()); } badQueue.add(baseCube.first - d, generalizedCube.second); // This Cube should be blocked in previous frame badQueue.add(baseCube.first, baseCube.second); // This Cube has not yet been blocked (postpone to future) //cout << "WOW" << endl; continue; } } if (checkReachability(baseCube.first, baseCube.second->getState())) { // SAT, Not Blocked Yet if(heavy_debug){ cerr << "SAT, generalizing... Frame before gen:" << baseCube.first << " Cube before gen:"; printState(baseCube.second->getState()); } if (profileON()) _ternaryStat->start(); generalizedCube.second = extractModel(baseCube.first - 1, baseCube.second); if (profileON()) _ternaryStat->end(); if(heavy_debug){ cerr << "SAT, pushing to queue, Frame after gen:" << baseCube.first-1 << " Cube after gen:"; printState(generalizedCube.second->getState()); } badQueue.add(baseCube.first - 1, generalizedCube.second); // This Cube should be blocked in previous frame badQueue.add(baseCube.first, baseCube.second); // This Cube has not yet been blocked (postpone to future) } else { // UNSAT, Blocked if (profileON()) _generalStat->start(); generalizedCube.first = baseCube.first; generalizedCube.second = new V3SIPDRCube(*(baseCube.second)); generalization2(generalizedCube); // Generalization if (profileON()) _generalStat->end(); addBlockedCube(generalizedCube); // Record this Cube that is bad and to be blocked if ((baseCube.first < getPDRDepth()) && (generalizedCube.first < getPDRFrame())) badQueue.add(baseCube.first + 1, baseCube.second); } } } return 0; }