5 files changed, 71 insertions, 8 deletions
diff --git a/libs/ezsat/Makefile b/libs/ezsat/Makefile
index 1dcb5d15..b1f86416 100644
--- a/libs/ezsat/Makefile
+++ b/libs/ezsat/Makefile
@@ -18,7 +18,8 @@ test: all
 	./testbench
 	./demo_bit
 	./demo_vec
-	./demo_cmp
+	# ./demo_cmp
+	# ./puzzle3d
 
 clean:
 	rm -f demo_bit demo_vec demo_cmp testbench puzzle3d *.o *.d
diff --git a/libs/ezsat/ezminisat.cc b/libs/ezsat/ezminisat.cc
index 6a6c075f..3f43f3ec 100644
--- a/libs/ezsat/ezminisat.cc
+++ b/libs/ezsat/ezminisat.cc
@@ -63,7 +63,8 @@ void ezMiniSAT::clear()
 #if EZMINISAT_SIMPSOLVER && EZMINISAT_INCREMENTAL
 void ezMiniSAT::freeze(int id)
 {
-	cnfFrozenVars.insert(bind(id));
+	if (!mode_non_incremental())
+		cnfFrozenVars.insert(bind(id));
 }
 
 bool ezMiniSAT::eliminated(int idx)
@@ -89,6 +90,8 @@ void ezMiniSAT::alarmHandler(int)
 
 bool ezMiniSAT::solver(const std::vector<int> &modelExpressions, std::vector<bool> &modelValues, const std::vector<int> &assumptions)
 {
+	preSolverCallback();
+
 	solverTimoutStatus = false;
 
 	if (0) {
diff --git a/libs/ezsat/ezsat.cc b/libs/ezsat/ezsat.cc
index 6da363fc..4c0b624b 100644
--- a/libs/ezsat/ezsat.cc
+++ b/libs/ezsat/ezsat.cc
@@ -30,6 +30,11 @@ const int ezSAT::FALSE = 2;
 
 ezSAT::ezSAT()
 {
+	flag_keep_cnf = false;
+	flag_non_incremental = false;
+
+	non_incremental_solve_used_up = false;
+
 	cnfConsumed = false;
 	cnfVariableCount = 0;
 	cnfClausesCount = 0;
@@ -588,19 +593,40 @@ int ezSAT::bind(int id, bool auto_freeze)
 
 void ezSAT::consumeCnf()
 {
-	cnfConsumed = true;
+	if (mode_keep_cnf())
+		cnfClausesBackup.insert(cnfClausesBackup.end(), cnfClauses.begin(), cnfClauses.end());
+	else
+		cnfConsumed = true;
 	cnfClauses.clear();
 }
 
 void ezSAT::consumeCnf(std::vector<std::vector<int>> &cnf)
 {
-	cnfConsumed = true;
+	if (mode_keep_cnf())
+		cnfClausesBackup.insert(cnfClausesBackup.end(), cnfClauses.begin(), cnfClauses.end());
+	else
+		cnfConsumed = true;
 	cnf.swap(cnfClauses);
 	cnfClauses.clear();
 }
 
+void ezSAT::getFullCnf(std::vector<std::vector<int>> &full_cnf) const
+{
+	assert(full_cnf.empty());
+	full_cnf.insert(full_cnf.end(), cnfClausesBackup.begin(), cnfClausesBackup.end());
+	full_cnf.insert(full_cnf.end(), cnfClauses.begin(), cnfClauses.end());
+}
+
+void ezSAT::preSolverCallback()
+{
+	assert(!non_incremental_solve_used_up);
+	if (mode_non_incremental())
+		non_incremental_solve_used_up = true;
+}
+
 bool ezSAT::solver(const std::vector<int>&, std::vector<bool>&, const std::vector<int>&)
 {
+	preSolverCallback();
 	fprintf(stderr, "************************************************************************\n");
 	fprintf(stderr, "ERROR: You are trying to use the solve() method of the ezSAT base class!\n");
 	fprintf(stderr, "Use a dervied class like ezMiniSAT instead.\n");
@@ -1081,16 +1107,26 @@ void ezSAT::printDIMACS(FILE *f, bool verbose) const
 			if (cnfExpressionVariables[i] != 0)
 				fprintf(f, "c %*d: %s\n", digits, cnfExpressionVariables[i], to_string(-i-1).c_str());
 
+		if (mode_keep_cnf()) {
+			fprintf(f, "c\n");
+			fprintf(f, "c %d clauses from backup, %d from current buffer\n",
+					int(cnfClausesBackup.size()), int(cnfClauses.size()));
+		}
+
 		fprintf(f, "c\n");
 	}
 
-	fprintf(f, "p cnf %d %d\n", cnfVariableCount, int(cnfClauses.size()));
+	std::vector<std::vector<int>> all_clauses;
+	getFullCnf(all_clauses);
+	assert(cnfClausesCount == int(all_clauses.size()));
+
+	fprintf(f, "p cnf %d %d\n", cnfVariableCount, cnfClausesCount);
 	int maxClauseLen = 0;
-	for (auto &clause : cnfClauses)
+	for (auto &clause : all_clauses)
 		maxClauseLen = std::max(int(clause.size()), maxClauseLen);
 	if (!verbose)
 		maxClauseLen = std::min(maxClauseLen, 3);
-	for (auto &clause : cnfClauses) {
+	for (auto &clause : all_clauses) {
 		for (auto idx : clause)
 			fprintf(f, " %*d", digits, idx);
 		if (maxClauseLen >= int(clause.size()))
diff --git a/libs/ezsat/ezsat.h b/libs/ezsat/ezsat.h
index 85240556..83e1b23c 100644
--- a/libs/ezsat/ezsat.h
+++ b/libs/ezsat/ezsat.h
@@ -48,6 +48,11 @@ public:
 	static const int FALSE;
 
 private:
+	bool flag_keep_cnf;
+	bool flag_non_incremental;
+
+	bool non_incremental_solve_used_up;
+
 	std::map<std::string, int> literalsCache;
 	std::vector<std::string> literals;
 
@@ -57,7 +62,7 @@ private:
 	bool cnfConsumed;
 	int cnfVariableCount, cnfClausesCount;
 	std::vector<int> cnfLiteralVariables, cnfExpressionVariables;
-	std::vector<std::vector<int>> cnfClauses;
+	std::vector<std::vector<int>> cnfClauses, cnfClausesBackup;
 
 	void add_clause(const std::vector<int> &args);
 	void add_clause(const std::vector<int> &args, bool argsPolarity, int a = 0, int b = 0, int c = 0);
@@ -67,6 +72,9 @@ private:
 	int bind_cnf_and(const std::vector<int> &args);
 	int bind_cnf_or(const std::vector<int> &args);
 
+protected:
+	void preSolverCallback();
+
 public:
 	int solverTimeout;
 	bool solverTimoutStatus;
@@ -74,6 +82,12 @@ public:
 	ezSAT();
 	virtual ~ezSAT();
 
+	void keep_cnf() { flag_keep_cnf = true; }
+	void non_incremental() { flag_non_incremental = true; }
+
+	bool mode_keep_cnf() const { return flag_keep_cnf; }
+	bool mode_non_incremental() const { return flag_non_incremental; }
+
 	// manage expressions
 
 	int value(bool val);
@@ -155,6 +169,9 @@ public:
 	void consumeCnf();
 	void consumeCnf(std::vector<std::vector<int>> &cnf);
 
+	// use this function to get the full CNF in keep_cnf mode
+	void getFullCnf(std::vector<std::vector<int>> &full_cnf) const;
+
 	std::string cnfLiteralInfo(int idx) const;
 
 	// simple helpers for build expressions easily
diff --git a/libs/ezsat/testbench.cc b/libs/ezsat/testbench.cc
index 8332ad91..d20258c3 100644
--- a/libs/ezsat/testbench.cc
+++ b/libs/ezsat/testbench.cc
@@ -64,6 +64,7 @@ void test_simple()
 	printf("==== %s ====\n\n", __PRETTY_FUNCTION__);
 
 	ezMiniSAT sat;
+	sat.non_incremental();
 	sat.assume(sat.OR("A", "B"));
 	sat.assume(sat.NOT(sat.AND("A", "B")));
 	test(sat);
@@ -121,6 +122,8 @@ void test_xorshift32()
 	printf("==== %s ====\n\n", __PRETTY_FUNCTION__);
 
 	ezMiniSAT sat;
+	sat.keep_cnf();
+
 	xorshift128 rng;
 
 	std::vector<int> bits = sat.vec_var("i", 32);
@@ -137,6 +140,9 @@ void test_xorshift32()
 	test_xorshift32_try(sat, rng());
 	test_xorshift32_try(sat, rng());
 	test_xorshift32_try(sat, rng());
+
+	sat.printDIMACS(stdout, true);
+	printf("\n");
 }
 
 // ------------------------------------------------------------------------------------------------------------