Merge pull request #624 from chriseth/inaccessibleDynType

Inaccessible dynamic types

test/libsolidity/SolidityEndToEndTest.cpp

@@ -6793,6 +6793,51 @@ BOOST_AUTO_TEST_CASE(cleanup_bytes_types)
 	BOOST_CHECK(callContractFunction("f(bytes2,uint16)", string("abc"), u256(0x040102)) == encodeArgs(0));
 }
 
+BOOST_AUTO_TEST_CASE(skip_dynamic_types)
+{
+	// The EVM cannot provide access to dynamically-sized return values, so we have to skip them.
+	char const* sourceCode = R"(
+		contract C {
+			function f() returns (uint, uint[], uint) {
+				return (7, new uint[](2), 8);
+			}
+			function g() returns (uint, uint) {
+				// Previous implementation "moved" b to the second place and did not skip.
+				var (a, _, b) = this.f();
+				return (a, b);
+			}
+		}
+	)";
+	compileAndRun(sourceCode, 0, "C");
+	BOOST_CHECK(callContractFunction("g()") == encodeArgs(u256(7), u256(8)));
+}
+
+BOOST_AUTO_TEST_CASE(skip_dynamic_types_for_structs)
+{
+	// For accessors, the dynamic types are already removed in the external signature itself.
+	char const* sourceCode = R"(
+		contract C {
+			struct S {
+				uint x;
+				string a; // this is present in the accessor
+				uint[] b; // this is not present
+				uint y;
+			}
+			S public s;
+			function g() returns (uint, uint) {
+				s.x = 2;
+				s.a = "abc";
+				s.b = [7, 8, 9];
+				s.y = 6;
+				var (x, a, y) = this.s();
+				return (x, y);
+			}
+		}
+	)";
+	compileAndRun(sourceCode, 0, "C");
+	BOOST_CHECK(callContractFunction("g()") == encodeArgs(u256(2), u256(6)));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -2154,6 +2154,8 @@ BOOST_AUTO_TEST_CASE(dynamic_return_types_not_possible)
 			function f(uint) returns (string);
 			function g() {
 				var (x,) = this.f(2);
+				// we can assign to x but it is not usable.
+				bytes(x).length;
 			}
 		}
 	)";