Merge pull request #9881 from ethereum/smt_fixed_bytes_index_access

[SMTChecker] Support fixed bytes index access

test/libsolidity/smtCheckerTests/operators/index_access_for_bytes.sol

@@ -6,5 +6,3 @@ contract C {
     }
 }
 // ----
-// Warning 7989: (116-120): Assertion checker does not yet support index accessing fixed bytes.
-// Warning 7989: (108-122): Assertion checker does not yet support index accessing fixed bytes.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_1.sol

@@ -6,4 +6,3 @@ contract c {
 	}
 }
 // ----
-// Warning 7989: (123-134): Assertion checker does not yet support index accessing fixed bytes.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_2.sol

@@ -6,6 +6,4 @@ contract C {
 	}
 }
 // ----
-// Warning 7989: (101-108): Assertion checker does not yet support index accessing fixed bytes.
-// Warning 7989: (112-121): Assertion checker does not yet support index accessing fixed bytes.
 // Warning 3046: (117-120): Division by zero happens here.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_3.sol

@@ -13,5 +13,3 @@ contract C {
 	}
 }
 // ----
-// Warning 7989: (238-247): Assertion checker does not yet support index accessing fixed bytes.
-// Warning 7989: (251-257): Assertion checker does not yet support index accessing fixed bytes.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_4.sol

@@ -0,0 +1,15 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		bytes32 x = 0x00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff;
+		byte z = 0x00;
+		byte o = 0xff;
+		assert(x[0] == z);
+		assert(x[31] == o);
+		assert(x[0] == x[22]);
+		assert(x[0] == x[23]);
+	}
+}
+// ----
+// Warning 6328: (260-281): Assertion violation happens here.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_5.sol

@@ -0,0 +1,16 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		bytes4 x = 0x01020304;
+		byte b = 0x02;
+		assert(x[0] == b); // fails
+		assert(x[1] == b);
+		assert(x[2] == b); // fails
+		assert(x[3] == b); // fails
+	}
+}
+// ----
+// Warning 6328: (118-135): Assertion violation happens here.
+// Warning 6328: (169-186): Assertion violation happens here.
+// Warning 6328: (199-216): Assertion violation happens here.

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_6.sol

@@ -0,0 +1,11 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		bytes4 x = 0x01020304;
+		byte b = x[3];
+		assert(b == b[0]);
+		assert(b == b[0][0]);
+		assert(b == b[0][0][0][0][0][0][0][0][0][0][0]);
+	}
+}

test/libsolidity/smtCheckerTests/types/fixed_bytes_access_7.sol

@@ -0,0 +1,16 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(uint i) public pure {
+		bytes4 x = 0x01020304;
+		require(i > 3);
+		assert(x[i] == 0x00);
+		i = 5;
+		assert(x[i] == 0);
+		assert(x[i] != 0);
+	}
+}
+// ----
+// Warning 6328: (125-145): Assertion violation happens here.
+// Warning 6328: (158-175): Assertion violation happens here.
+// Warning 6328: (179-196): Assertion violation happens here.