Fix test builtins & add simple smoke test.

Author: aarlt

test/libsolidity/SemanticTest.cpp

@@ -61,6 +61,8 @@ SemanticTest::SemanticTest(
 	m_enforceGasCost(_enforceGasCost),
 	m_enforceGasCostMinValue(_enforceGasCostMinValue)
 {
+	initializeBuiltins();
+
 	string choice = m_reader.stringSetting("compileViaYul", "default");
 	if (choice == "also")
 	{
@@ -122,6 +124,15 @@ SemanticTest::SemanticTest(
 	}
 }
 
+void SemanticTest::initializeBuiltins()
+{
+	solAssert(m_builtins.count("smokeTest") == 0, "");
+	m_builtins["smokeTest"] = [](FunctionCall const&) -> std::optional<bytes>
+	{
+		return util::toBigEndian(u256(0x1234));
+	};
+}
+
 TestCase::TestResult SemanticTest::run(ostream& _stream, string const& _linePrefix, bool _formatted)
 {
 	TestResult result = TestResult::Success;

test/libsolidity/SemanticTest.h

@@ -78,6 +78,7 @@ class SemanticTest: public SolidityExecutionFramework, public EVMVersionRestrict
 private:
 	TestResult runTest(std::ostream& _stream, std::string const& _linePrefix, bool _formatted, bool _compileViaYul, bool _compileToEwasm);
 	bool checkGasCostExpectation(TestFunctionCall& io_test, bool _compileViaYul) const;
+	void initializeBuiltins();
 	SourceMap m_sources;
 	std::size_t m_lineOffset;
 	std::vector<TestFunctionCall> m_tests;

test/libsolidity/semanticTests/builtins/smoke_test.sol

@@ -0,0 +1,7 @@
+contract SmokeTest {
+}
+// ====
+// compileViaYul: also
+// ----
+// constructor()
+// smokeTest -> 0x1234

test/libsolidity/util/TestFileParser.cpp

@@ -127,6 +127,8 @@ vector<solidity::frontend::test::FunctionCall> TestFileParser::parseFunctionCall
 							tie(call.signature, lowLevelCall) = parseFunctionSignature();
 							if (lowLevelCall)
 								call.kind = FunctionCall::Kind::LowLevel;
+							else if (isBuiltinFunction(call.signature))
+								call.kind = FunctionCall::Kind::Builtin;
 
 							if (accept(Token::Comma, true))
 								call.value = parseFunctionCallValue();