Add optional bounds to unroll loops in BMC model checker

test/libsolidity/SMTCheckerTest.cpp

@@ -122,6 +122,9 @@ SMTCheckerTest::SMTCheckerTest(string const& _filename): SyntaxTest(_filename, E
 			m_shouldRun = false;
 #endif
 	}
+
+	auto const& bmcLoopIterations = m_reader.sizetSetting("BMCLoopIterations", 1);
+	m_modelCheckerSettings.bmcLoopIterations = std::optional<unsigned>{bmcLoopIterations};
 }
 
 TestCase::TestResult SMTCheckerTest::run(ostream& _stream, string const& _linePrefix, bool _formatted)

test/libsolidity/SMTCheckerTest.h

@@ -55,6 +55,8 @@ protected:
 		Set in m_modelCheckerSettings.
 	SMTSolvers: `all`, `cvc4`, `z3`, `none`, where the default is `all`.
 		Set in m_modelCheckerSettings.
+	BMCLoopIterations: number of loop iterations for BMC engine, the default is 1.
+		Set in m_modelCheckerSettings.
 	*/
 
 	ModelCheckerSettings m_modelCheckerSettings;

test/libsolidity/smtCheckerTests/functions/functions_trivial_condition_for.sol

@@ -1,8 +0,0 @@
-contract C
-{
-	function f(bool x) public pure { require(x); for (;x;) {} }
-}
-// ====
-// SMTEngine: all
-// ----
-// Warning 6838: (65-66): BMC: Condition is always true.

test/libsolidity/smtCheckerTests/functions/functions_trivial_condition_while.sol

@@ -1,8 +0,0 @@
-contract C
-{
-	function f(bool x) public pure { require(x); while (x) {} }
-}
-// ====
-// SMTEngine: all
-// ----
-// Warning 6838: (66-67): BMC: Condition is always true.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_1.sol

@@ -0,0 +1,16 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		do {
+			++x;
+		} while (x < 2);
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_2.sol

@@ -0,0 +1,20 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			{
+				++x;
+				++x;
+			}
+		} while (x < 3);
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_3.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		do {
+			if (x >= 2)
+				++x;
+			++x;
+		} while (x < 3);
+		assert(x == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_4.sol

@@ -0,0 +1,15 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+		} while (true);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_5.sol

@@ -0,0 +1,22 @@
+contract C {
+    uint x;
+
+    function condition() private returns(bool) {
+		++x;
+		return x < 3;
+	}
+
+	function f() public {
+		require(x == 0);
+		do {
+		} while (condition());
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (77-80): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_assertion_fails_1.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		do {
+			++x;
+		} while (x < 2);
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 4661: (102-116): BMC: Assertion violation happens here.
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_assertion_fails_2.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			break;
+		} while (x < 3);
+		assert(x == 0);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 2
+// ----
+// Warning 5740: (87-92): Unreachable code.
+// Warning 4661: (97-111): BMC: Assertion violation happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_assertion_fails_3.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			continue;
+		} while (x < 2);
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 2
+// ----
+// Warning 4661: (100-114): BMC: Assertion violation happens here.
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_1.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			break;
+		} while (x < 3);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Warning 5740: (87-92): Unreachable code.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_2.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		do {
+			if (x > 0)
+				break;
+			++x;
+		} while (x < 3);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_3.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		do {
+			if (x >= 0) {
+				++x;
+				break;
+			}
+			++x;
+		} while (x < 3);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_4.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		do {
+			if (x > 0) {
+				++x;
+				break;
+			}
+			++x;
+		} while (x < 3);
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_5.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		do {
+			++x;
+			if (x > 1) {
+				++x;
+				break;
+			}
+		} while (x < 3);
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_6.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			if (x > 0) {
+ 				x = 2;
+				break;
+			}
+			if (x > 1) {
+				x = 3;
+				break;
+			}
+		} while (x < 3);
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_7.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			++x;
+			if (x > 1) {
+				x = 3;
+				break;
+ 			}
+			if (x > 0) {
+				x = 2;
+				break;
+ 			}
+		} while (x < 3);
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_8.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			break;
+		} while (++x < 2);
+        // loop condition is not executed after break
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 5740: (79-86): Unreachable code.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_continue_1.sol

@@ -0,0 +1,21 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			if (x > 1) {
+				break;
+ 			}
+			if (x >= 0) {
+				x = 10;
+				continue;
+ 			}
+		} while (x < 3);
+		assert(x == 10);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_break_continue_2.sol

@@ -0,0 +1,22 @@
+contract C {
+	function f() public pure {
+		uint x;
+		do {
+			if (x > 1) {
+				x = 3;
+				break;
+ 			}
+			if (x >= 0) {
+				x = 2;
+				continue;
+ 			}
+		} while (x < 4);
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_continue_1.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		do {
+			++x;
+			if (x == 3) {
+				continue;
+			}
+			++x;
+		} while (x < 3);
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_continue_2.sol

@@ -0,0 +1,25 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		uint y = 0;
+		do {
+			++x;
+			if (x == 2) {
+				++x;
+				y = 1;
+				continue;
+			}
+			if (x == 3) {
+				y = 2;
+				continue;
+			}
+		} while (x < 3);
+		assert(y == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_continue_3.sol

@@ -0,0 +1,24 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		uint y = 0;
+		do {
+			++x;
+			if (x > 0) {
+				y = 1;
+				continue;
+			}
+			if (x > 0) {
+				y = 2;
+				continue;
+			}
+		} while (x < 3);
+		assert(y == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_continue_4.sol

@@ -0,0 +1,25 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		uint i;
+		do {
+			++i;
+			if (i == 2) {
+				x = 2;
+				continue;
+			}
+			if (i == 1) {
+				x = 1;
+				continue;
+			}
+		} while (i < 3);
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_nested.sol

@@ -0,0 +1,22 @@
+contract C
+{
+	function f(uint z) public pure {
+		uint x = 0;
+		require(z == 0);
+		do {
+			uint y = 0;
+			do {
+				++z;
+				++y;
+			} while (y < 2);
+			++x;
+		} while (x < 2);
+		assert(z == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_nested_break.sol

@@ -0,0 +1,24 @@
+contract C
+{
+	function f(uint z) public pure {
+		uint x = 0;
+		require(z == 0);
+		do {
+			uint y = 0;
+			do {
+				if (y > 0)
+					break;
+				++z;
+				++y;
+			} while (y < 2);
+			++x;
+		} while (x < 2);
+		assert(z == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_nested_continue.sol

@@ -0,0 +1,24 @@
+contract C
+{
+	function f(uint z) public pure {
+		uint x = 0;
+		require(z == 0);
+		do {
+			uint y = 0;
+			do {
+				++y;
+				if (y > 0)
+					continue;
+				++z;
+			} while (y < 2);
+			++x;
+		} while (x < 2);
+		assert(z == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_1.sol

@@ -0,0 +1,20 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		do {
+			if (x >= 3)
+				y = 1;
+			++x;
+		} while (x < 3 || y == 1);
+        // BMC loop iteration setting is not enough to leave the loop
+		assert(x == 0); // should hold - no assumptions on value if didn't complete loop
+		assert(y == 0); // should hold - no assumptions on value if didn't complete loop
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_2.sol

@@ -0,0 +1,20 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		do {
+			if (x >= 3)
+				y = 1;
+			++x;
+		} while (x < 3 || y == 1);
+        // BMC loop iteration setting is just enough to leave the loop
+		assert(x == 3); // should hold
+		assert(y == 1); // should hold
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_3.sol

@@ -0,0 +1,20 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		do {
+			if (x >= 3)
+				y = 1;
+			++x;
+		} while (x < 3 || y == 1);
+        // BMC loop iteration setting is more than enough to leave the loop
+		assert(x == 3); // should hold
+		assert(y == 1); // should hold
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_shallow_unroll.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f(uint x) public pure {
+		require(x == 0);
+		uint y;
+		do {
+			++y;
+			if (y == 2)
+			    x = 3;
+		} while (y < 3);
+		// nothing is reported because loop condition is true after unrolling the loop one time
+		assert(x == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_1_fail.sol

@@ -1,19 +0,0 @@
-contract C
-{
-	function f(uint x) public pure {
-		require(x < 100);
-		for(uint i = 0; i < 10; ++i) {
-			// Overflows due to resetting x.
-			x = x + 1;
-		}
-		assert(x < 14);
-	}
-}
-// ====
-// SMTEngine: all
-// SMTSolvers: z3
-// ----
-// Warning 4984: (143-148): CHC: Overflow (resulting value larger than 2**256 - 1) might happen here.
-// Warning 6328: (156-170): CHC: Assertion violation happens here.
-// Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
-// Warning 2661: (143-148): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.

test/libsolidity/smtCheckerTests/loops/for_1_false_positive.sol

@@ -14,4 +14,4 @@ contract C
 // ----
 // Warning 4984: (106-111): CHC: Overflow (resulting value larger than 2**256 - 1) might happen here.
 // Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
-// Warning 2661: (106-111): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_1.sol

@@ -0,0 +1,15 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i)
+			++x;
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_2.sol

@@ -0,0 +1,15 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i)
+			x = i;
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_3.sol

@@ -0,0 +1,16 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i)
+			if (i > 1)
+				x = 10;
+		assert(x == 10);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+//  Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_4.sol

@@ -0,0 +1,15 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 0; ++i)
+			++x;
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_5.sol

@@ -0,0 +1,14 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (; x < 0; ++x) {}
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_6.sol

@@ -0,0 +1,16 @@
+contract C
+{
+	function f() public pure {
+		uint x = 0;
+		for (uint i = 1; i < 3;) {
+			x = i;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_7.sol

@@ -0,0 +1,23 @@
+contract C
+{
+	uint x;
+
+	function condition() private returns(bool) {
+		++x;
+		return x < 3;
+	}
+
+	function f() public {
+		require(x == 0);
+		for (; condition();) {
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (71-74): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_8.sol

@@ -0,0 +1,31 @@
+contract C
+{
+	uint x;
+	uint y;
+
+	function condition() private returns(bool) {
+		++x;
+		return x < 3;
+	}
+
+	function expression() private {
+		++y;
+	}
+
+	function f() public {
+		require(x == 0);
+		require(y == 0);
+		for (; condition(); expression()) {
+		}
+		assert(x == 3);
+		assert(y == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (80-83): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Warning 2661: (140-143): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_assertion_fails_1.sol

@@ -0,0 +1,16 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i)
+			++x;
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 4661: (92-106): BMC: Assertion violation happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_assertion_fails_2.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i) {
+			++x;
+			break;
+		}
+		assert(x == 0);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 5740: (77-80): Unreachable code.
+// Warning 4661: (108-122): BMC: Assertion violation happens here.
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_assertion_fails_3.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i) {
+			++x;
+			continue;
+		}
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 4661: (111-125): BMC: Assertion violation happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_1.sol

@@ -0,0 +1,19 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			break;
+			++x;
+		}
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Warning 5740: (77-80): Unreachable code.
+// Warning 5740: (97-100): Unreachable code.
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_2.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			++x;
+ 			break;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Warning 5740: (77-80): Unreachable code.
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_3.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 0)
+				break;
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_4.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			++x;
+			if (i > 0)
+				break;
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_5.sol

@@ -0,0 +1,23 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 1) {
+				x = 1;
+				break;
+			}
+			if (i > 1) {
+				x = 2;
+				break;
+			}
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_6.sol

@@ -0,0 +1,23 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 1) {
+				x = 1;
+				break;
+			}
+			if (i >= 1) {
+				x = 2;
+				break;
+			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_7.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (;;) {
+			++x;
+			break;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_8.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (;;) {
+ 			break;
+			++x;
+		}
+		assert(x == 0);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Warning 5740: (78-81): Unreachable code.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_9.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (;x < 2;) {
+			++x;
+ 			break;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_continue_1.sol

@@ -0,0 +1,22 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 1) {
+				break;
+ 			}
+			if (i >= 0) {
+				x = 10;
+				continue;
+ 			}
+		}
+		assert(x == 10);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_continue_2.sol

@@ -0,0 +1,23 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i) {
+			if (i > 0) {
+				x = 1;
+				break;
+ 			}
+			if (i >= 0) {
+				x = 2;
+				continue;
+			}
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 2
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_break_continue_3.sol

@@ -0,0 +1,22 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 0) {
+				x = 1;
+				break;
+ 			} else {
+				x = 2;
+				continue;
+			}
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_continue_1.sol

@@ -0,0 +1,18 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		for (uint i = 0; i < 3; ++i) {
+			if (i > 1)
+				continue;
+			++x;
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_continue_2.sol

@@ -0,0 +1,23 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i) {
+			if (i == 1) {
+				x = 1;
+				continue;
+			}
+			if (i == 0) {
+				x = 2;
+				continue;
+			}
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_continue_3.sol

@@ -0,0 +1,24 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		for (uint i = 0; i < 3; ++i) {
+			if (x > 1) {
+				x = 10;
+				continue;
+			}
+ 			if (x > 0) {
+				x = 11;
+				continue;
+			}
+			++x;
+		}
+		assert(x == 10);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_continue_4.sol

@@ -0,0 +1,24 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (; x < 2; ++x) {
+			if (x > 1) {
+				x = 10;
+				continue;
+			}
+			if (x > 0) {
+				x = 11;
+				continue;
+			}
+		}
+		// x > 0 branch triggers x = 11 and continue triggers ++x loop expression
+		assert(x == 12);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_continue_5.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (; x < 2; ++x) {
+			continue;
+		}
+		// loop expression is executed after continue
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_false_positive.sol

@@ -0,0 +1,16 @@
+contract C
+{
+	function f() public pure {
+		uint x = 0;
+		for (;;) {
+			x = 1;
+		}
+		assert(x == 1000);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_nested.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f() public pure {
+		uint x;
+		for (uint i = 0; i < 2; ++i) {
+			for (uint j = 0; j < 2; ++j)
+				++x;
+		}
+		assert(x == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_nested_break.sol

@@ -0,0 +1,22 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		for (uint i = 0; i < 2; ++i) {
+			for (uint j = 0; j < 2; ++j) {
+				x = x + 1;
+				break;
+			}
+			break;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 5740: (92-95): Unreachable code.
+// Warning 5740: (126-129): Unreachable code.
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_nested_continue.sol

@@ -0,0 +1,20 @@
+contract C
+{
+	function f() public pure {
+		uint x = 0;
+		for (uint i = 0; i < 2; ++i) {
+			for (uint j = 0; j < 2; ++j) {
+			    if (i > 0)
+					continue;
+				++x;
+			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_semantics_1.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		for (; x < 3 || y == 1; ++x) {
+			if (x >= 3)
+				y = 1;
+		}
+        // BMC loop iteration setting is not enough to leave the loop
+		assert(x == 0); // should hold - no assumptions on value if didn't complete loop
+		assert(y == 0); // should hold - no assumptions on value if didn't complete loop
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_semantics_2.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		for (; x < 3 || y == 1; ++x) {
+			if (x >= 3)
+				y = 1;
+		}
+        // BMC loop iteration setting is just enough to leave the loop
+		assert(x == 3); // should hold - no assumptions on value if didn't complete loop
+		assert(y == 0); // should hold - no assumptions on value if didn't complete loop
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_semantics_3.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		for (; x < 3 || y == 1; ++x) {
+			if (x >= 3)
+				y = 1;
+		}
+        // BMC loop iteration setting is more than enough to leave the loop
+		assert(x == 3); // should hold - no assumptions on value if didn't complete loop
+		assert(y == 0); // should hold - no assumptions on value if didn't complete loop
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_shallow_unroll.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f() public pure {
+		uint x = 0;
+		for (uint i = 0; i < 2; ++i) {
+			++x;
+		}
+		// nothing is reported because loop condition is still true after BMCLoopIterations
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_trivial_condition_1.sol

@@ -10,4 +10,3 @@ contract C {
 // SMTSolvers: z3
 // ----
 // Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
-// Warning 6838: (90-96): BMC: Condition is always true.

test/libsolidity/smtCheckerTests/loops/for_loop_trivial_condition_2.sol

@@ -13,4 +13,3 @@ contract C {
 // SMTSolvers: z3
 // ----
 // Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
-// Warning 6838: (106-112): BMC: Condition is always true.

test/libsolidity/smtCheckerTests/loops/for_loop_unreachable_1.sol

@@ -1,13 +0,0 @@
-contract C {
-    function f(uint x) public pure {
-        require(x == 2);
-        for (; x > 2;) {}
-        assert(x == 2);
-    }
-}
-// ====
-// SMTEngine: all
-// SMTSolvers: z3
-// ----
-// Info 1391: CHC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
-// Warning 6838: (90-95): BMC: Condition is always false.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_1.sol

@@ -0,0 +1,18 @@
+contract C {
+	function f(uint x) public pure {
+		require(x == 0);
+		uint y;
+		while (y < 3) {
+			++y;
+			if (y == 2)
+			    x = 3;
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 2
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_2.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			{
+				++x;
+				++x;
+			}
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_3.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			if (x >= 2)
+				++x;
+			++x;
+		}
+		assert(x == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_4.sol

@@ -0,0 +1,15 @@
+contract C {
+	function f(uint x) public pure {
+		x = 0;
+		while (x < 1) {
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_5.sol

@@ -0,0 +1,15 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (true) {
+			++x;
+		}
+		assert(x == 1000);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 1
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_7.sol

@@ -0,0 +1,22 @@
+contract C {
+    uint x;
+
+    function condition() private returns(bool) {
+		++x;
+		return x < 3;
+	}
+
+	function f() public {
+		require(x == 0);
+		while (condition()) {
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (77-80): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_assertion_fails_1.sol

@@ -0,0 +1,17 @@
+contract C
+{
+	function f(uint x) public pure {
+		require(x == 0);
+		while (x < 2) {
+			++x;
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 4661: (98-112): BMC: Assertion violation happens here.
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_assertion_fails_2.sol

@@ -0,0 +1,18 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 2) {
+			++x;
+			break;
+		}
+		assert(x == 0);
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 2
+// ----
+// Warning 4661: (93-107): BMC: Assertion violation happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_assertion_fails_3.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 2) {
+			++x;
+			continue;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Warning 4661: (96-110): BMC: Assertion violation happens here.
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_1.sol

@@ -0,0 +1,16 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			break;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_2.sol

@@ -0,0 +1,17 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			if (x > 0)
+				break;
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_3.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			if (x > 0) {
+				++x;
+				break;
+			}
+			++x;
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_4.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			if (x > 0) {
+ 				++x;
+				break;
+			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_5.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			if (x > 1) {
+				++x;
+				break;
+			}
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_6.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			if (x > 0) {
+ 				x = 2;
+				break;
+			}
+			if (x > 1) {
+				x = 3;
+				break;
+			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_7.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			++x;
+			if (x > 1) {
+				x = 3;
+				break;
+ 			}
+			if (x > 0) {
+				x = 2;
+				break;
+ 			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_8.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		while (x < 3) {
+			if (x >= 0) {
+				++x;
+				break;
+			}
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_9.sol

@@ -0,0 +1,18 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		while (x < 3) {
+			++x;
+			break;
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Warning 5740: (94-97): Unreachable code.
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_continue_1.sol

@@ -0,0 +1,21 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			if (x > 1) {
+				break;
+ 			}
+			if (x >= 0) {
+				x = 10;
+				continue;
+ 			}
+		}
+		assert(x == 10);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_break_continue_2.sol

@@ -0,0 +1,22 @@
+contract C {
+	function f() public pure {
+		uint x;
+		while (x < 3) {
+			if (x > 1) {
+				x = 3;
+				break;
+ 			}
+			if (x >= 0) {
+				x = 2;
+				continue;
+ 			}
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 1 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_continue_1.sol

@@ -0,0 +1,19 @@
+contract C {
+	function f() public pure {
+		uint x;
+		uint i;
+		while (i < 3) {
+			++i;
+			if (i > 1)
+				continue;
+			++x;
+		}
+		assert(x == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_continue_2.sol

@@ -0,0 +1,24 @@
+contract C {
+	function f(uint x) public pure {
+		require(x == 0);
+		uint i;
+		while (i < 3) {
+			 ++i;
+			if (i == 2) {
+				x = 2;
+				continue;
+			}
+			if (i == 1) {
+				x = 1;
+				continue;
+			}
+		}
+		assert(x == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_nested.sol

@@ -0,0 +1,22 @@
+contract C {
+	function f(uint z) public pure {
+		uint x = 0;
+		require(z == 0);
+		while (x < 2) {
+			uint y = 0;
+			while (y < 2) {
+				++z;
+				++y;
+			}
+			++x;
+		}
+		assert(z == 4);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
+

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_nested_break.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f(uint z) public pure {
+		uint x = 0;
+		require(z == 0);
+		while (x < 2) {
+			uint y = 0;
+			while (y < 2) {
+				if (y > 0)
+					break;
+				++z;
+				++y;
+			}
+			++x;
+		}
+		assert(z == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 3
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_nested_continue.sol

@@ -0,0 +1,23 @@
+contract C {
+	function f() public pure {
+		uint x;
+		uint i;
+		while (i < 3) {
+			++i;
+			uint j;
+			while (j < 3) {
+				++j;
+				if (i > 1)
+					continue;
+				++x;
+			}
+		}
+		assert(x == 3);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 4
+// ----
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.