Merge pull request #6665 from ethereum/smt_inline_external_this

[SMTChecker] Inline external function calls to `this`

test/libsolidity/smtCheckerTests/functions/function_call_does_not_clear_local_vars.sol

@@ -9,4 +9,5 @@ contract C {
     }
 }
 // ----
+// Warning: (99-107): Assertion checker does not support recursive function calls.
 // Warning: (141-144): Assertion checker does not support recursive function calls.

test/libsolidity/smtCheckerTests/functions/this_external_call.sol

@@ -0,0 +1,14 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	uint x;
+	function f(uint y) public {
+		x = y;
+	}
+	function g(uint y) public {
+		require(y < 1000);
+		this.f(y);
+		assert(x < 1000);
+	}
+}

test/libsolidity/smtCheckerTests/functions/this_external_call_return.sol

@@ -0,0 +1,15 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	uint x;
+	function f(uint y) public returns (uint) {
+		x = y;
+		return x;
+	}
+	function g(uint y) public {
+		require(y < 1000);
+		uint z = this.f(y);
+		assert(z < 1000);
+	}
+}

test/libsolidity/smtCheckerTests/functions/this_fake.sol

@@ -0,0 +1,24 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+    uint public x;
+    C c;
+    function f(C _c) public {
+        c = _c;
+    }
+    function g() public {
+        C this = c;
+		x = 0;
+        this.h();
+		// State knowledge is erased.
+		// Function call is not inlined.
+		assert(x == 0);
+    }
+    function h() public {
+        x = 2;
+    }
+}
+// ----
+// Warning: (160-166): This declaration shadows a builtin symbol.
+// Warning: (268-282): Assertion violation happens here

test/libsolidity/smtCheckerTests/functions/this_state.sol

@@ -0,0 +1,15 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+    uint public x;
+    function g() public {
+		x = 0;
+        this.h();
+		// Function call is inlined.
+		assert(x == 2);
+    }
+    function h() public {
+        x = 2;
+    }
+}