[isoltest] Support FAILURE with reason.

test/libsolidity/semanticTests/smoke_test.sol

@@ -18,9 +18,12 @@ contract C {
     function balance() payable public returns (uint256) {
         return address(this).balance;
     }
-    function e(uint a) public {
+    function d(uint a) public {
         state = a;
     }
+    function e() public {
+        revert("Transaction failed.");
+    }
     function f() payable public returns (uint) {
         return 2;
     }
@@ -88,12 +91,15 @@ contract C {
         return (["any", "any"], ["any", "any", "any"]);
     }
 }
+// ====
+// EVMVersion: >homestead
 // ----
 // constructor(), 2 ether: 3 ->
 // state() -> 3
 // balance() -> 2
 // _() -> FAILURE
-// e(uint256): 4
+// d(uint256): 4
+// e() -> FAILURE, hex"08c379a0", 0x20, 19, "Transaction failed."
 // f() -> 2
 // f(uint256): 3 -> 3, 3
 // f(), 1 ether -> 2

test/libsolidity/util/BytesUtils.cpp

@@ -202,21 +202,28 @@ string BytesUtils::formatString(bytes const& _bytes, size_t _cutOff)
 	return os.str();
 }
 
-string BytesUtils::formatRawBytes(bytes const& _bytes)
+string BytesUtils::formatRawBytes(bytes const& _bytes, string _linePrefix, bool _withSignature)
 {
 	if (_bytes.empty())
-		return "[]";
+		return _linePrefix + "[]";
 
 	stringstream os;
 	auto it = _bytes.begin();
-	for (size_t i = 0; i < _bytes.size(); i += 32)
+
+	if (_withSignature)
 	{
-		bytes byteRange{it, it + 32};
+		os << _linePrefix << bytes{it, it + 4} << endl;
+		it += 4;
+	}
 
-		os << "  " << byteRange;
+	bytes tail{it, _bytes.end()};
+	it = tail.begin();
 
+	for (size_t i = 0; i < tail.size(); i += 32)
+	{
+		os << _linePrefix << bytes{it, it + 32};
 		it += 32;
-		if (it != _bytes.end())
+		if (it != tail.end())
 			os << endl;
 	}
 
@@ -287,11 +294,12 @@ string BytesUtils::formatBytesRange(
 		else
 			os << parameter.rawString;
 
-
-		it += static_cast<long>(parameter.abiType.size);
 		if (&parameter != &_parameters.back())
 			os << ", ";
+
+		it += static_cast<long>(parameter.abiType.size);
 	}
+
 	return os.str();
 }
 

test/libsolidity/util/BytesUtils.h

@@ -101,10 +101,14 @@ public:
 		return formatString(_bytes, _bytes.size());
 	}
 
-	/// Returns a string representation of given _bytes. Adds a newline
-	/// every 32 bytes to increase readability.
 	/// Used to print returned bytes from function calls to the commandline.
-	static std::string formatRawBytes(bytes const& _bytes);
+	/// Returns a string representation of given _bytes in ranges of 32 bytes.
+	/// If _withSignature is true, the first 4 bytes will be formatted separately.
+	static std::string formatRawBytes(
+		bytes const& _bytes,
+		std::string _linePrefix = "",
+		bool _withSignature = false
+	);
 
 	/// Formats given _bytes with type information passed in _abiType.
 	static std::string formatBytes(bytes const& _bytes, ABIType const& _abiType);

test/libsolidity/util/TestFileParserTests.cpp

@@ -219,6 +219,23 @@ BOOST_AUTO_TEST_CASE(non_existent_call_revert)
 	testFunctionCall(calls.at(0), Mode::MultiLine, "i_am_not_there()", true);
 }
 
+BOOST_AUTO_TEST_CASE(call_revert_message)
+{
+	char const* source = R"(
+		// f() -> FAILURE, hex"08c379a0", 0x20, 6, "Revert"
+	)";
+	auto const calls = parse(source);
+	BOOST_REQUIRE_EQUAL(calls.size(), 1);
+	testFunctionCall(
+		calls.at(0),
+		Mode::SingleLine,
+		"f()",
+		true,
+		fmt::encodeArgs(),
+		fromHex("08c379a0") + fmt::encodeDyn(string{"Revert"})
+	);
+}
+
 BOOST_AUTO_TEST_CASE(call_expectations_empty_single_line)
 {
 	char const* source = R"(

test/libsolidity/util/TestFunctionCall.cpp

@@ -101,7 +101,7 @@ string TestFunctionCall::format(
 		{
 			bool const isFailure = m_call.expectations.failure;
 			result = isFailure ?
-				failure :
+				formatFailure(_errorReporter, m_call, m_rawBytes, _renderResult, highlight) :
 				formatRawParameters(m_call.expectations.result);
 			if (!result.empty())
 				AnsiColorized(stream, highlight, {dev::formatting::RED_BACKGROUND}) << ws << result;
@@ -111,7 +111,7 @@ string TestFunctionCall::format(
 			bytes output = m_rawBytes;
 			bool const isFailure = m_failure;
 			result = isFailure ?
-				failure :
+				formatFailure(_errorReporter, m_call, output, _renderResult, highlight) :
 				matchesExpectation() ?
 					formatRawParameters(m_call.expectations.result) :
 					formatBytesParameters(
@@ -122,6 +122,14 @@ string TestFunctionCall::format(
 						highlight
 					);
 
+			if (!matchesExpectation())
+			{
+				_errorReporter.warning(
+					"The call to \"" + m_call.signature + "\" returned \n" +
+					BytesUtils::formatRawBytes(output, _linePrefix, isFailure && !output.empty())
+				);
+			}
+
 			if (isFailure)
 				AnsiColorized(stream, highlight, {dev::formatting::RED_BACKGROUND}) << ws << result;
 			else
@@ -155,49 +163,97 @@ string TestFunctionCall::formatBytesParameters(
 	bytes const& _bytes,
 	string const& _signature,
 	dev::solidity::test::ParameterList const& _parameters,
-	bool _highlight
+	bool _highlight,
+	bool _failure
 ) const
 {
 	using ParameterList = dev::solidity::test::ParameterList;
 
 	stringstream os;
+
 	if (_bytes.empty())
 		return {};
 
-	_errorReporter.warning("The call to \"" + _signature + "\" returned \n" + BytesUtils::formatRawBytes(_bytes));
+	if (_failure)
-
-	boost::optional<ParameterList> abiParams = ContractABIUtils::parametersFromJsonOutputs(
-		_errorReporter,
-		m_contractABI,
-		_signature
-	);
-
-	if (abiParams)
 	{
-		boost::optional<ParameterList> preferredParams = ContractABIUtils::preferredParameters(
+		ParameterList defaultParameters;
-			_errorReporter,
-			_parameters,
-			abiParams.get(),
-			_bytes
-		);
 
-		if (preferredParams)
+		defaultParameters.push_back(Parameter{bytes(), "", ABIType{ABIType::HexString, ABIType::AlignNone, 4}, FormatInfo{}});
-		{
+		defaultParameters.push_back(Parameter{bytes(), "", ABIType{ABIType::Hex}, FormatInfo{}});
-			ContractABIUtils::overwriteParameters(_errorReporter, preferredParams.get(), abiParams.get());
+		defaultParameters.push_back(Parameter{bytes(), "", ABIType{ABIType::UnsignedDec}, FormatInfo{}});
-			os << BytesUtils::formatBytesRange(_bytes, preferredParams.get(), _highlight);
+		defaultParameters.push_back(Parameter{bytes(), "", ABIType{ABIType::String}, FormatInfo{}});
-		}
+
+		os << BytesUtils::formatBytesRange(_bytes, defaultParameters, _highlight);
+
+		return os.str();
 	}
 	else
 	{
-		ParameterList defaultParameters;
+		boost::optional<ParameterList> abiParams = ContractABIUtils::parametersFromJsonOutputs(
-		fill_n(
+			_errorReporter,
-			back_inserter(defaultParameters),
+			m_contractABI,
-			ceil(_bytes.size() / 32),
+			_signature
-			Parameter{bytes(), "", ABIType{ABIType::Hex}, FormatInfo{}}
 		);
-		ContractABIUtils::overwriteParameters(_errorReporter, defaultParameters, _parameters);
+
-		os << BytesUtils::formatBytesRange(_bytes, defaultParameters, _highlight);
+		if (abiParams)
+		{
+			boost::optional<ParameterList> preferredParams = ContractABIUtils::preferredParameters(
+				_errorReporter,
+				_parameters,
+				abiParams.get(),
+				_bytes
+			);
+
+			if (preferredParams)
+			{
+				ContractABIUtils::overwriteParameters(_errorReporter, preferredParams.get(), abiParams.get());
+				os << BytesUtils::formatBytesRange(_bytes, preferredParams.get(), _highlight);
+			}
+		}
+		else
+		{
+			ParameterList defaultParameters;
+			fill_n(
+				back_inserter(defaultParameters),
+				ceil(_bytes.size() / 32),
+				Parameter{bytes(), "", ABIType{ABIType::UnsignedDec}, FormatInfo{}}
+			);
+			ContractABIUtils::overwriteParameters(_errorReporter, defaultParameters, _parameters);
+			os << BytesUtils::formatBytesRange(_bytes, defaultParameters, _highlight);
+		}
+		return os.str();
 	}
+}
+
+string TestFunctionCall::formatFailure(
+	ErrorReporter& _errorReporter,
+	dev::solidity::test::FunctionCall const& _call,
+	bytes const& _output,
+	bool _renderResult,
+	bool _highlight
+) const
+{
+	using Token = soltest::Token;
+
+	stringstream os;
+
+	os << formatToken(Token::Failure);
+
+	if (!_output.empty())
+		os << ", ";
+
+	if (_renderResult)
+		os << formatBytesParameters(
+			_errorReporter,
+			_output,
+			_call.signature,
+			_call.expectations.result,
+			_highlight,
+			true
+		);
+	else
+		os << formatRawParameters(_call.expectations.result);
+
 	return os.str();
 }
 

test/libsolidity/util/TestFunctionCall.h

@@ -95,7 +95,8 @@ private:
 		bytes const& _bytes,
 		std::string const& _signature,
 		ParameterList const& _params,
-		bool highlight = false
+		bool highlight = false,
+		bool failure = false
 	) const;
 
 	/// Formats a given _bytes applying the _abiType.
@@ -104,6 +105,15 @@ private:
 		ABIType const& _abiType
 	) const;
 
+	/// Formats a FAILURE plus additional parameters, if e.g. a revert message was returned.
+	std::string formatFailure(
+		ErrorReporter& _errorReporter,
+		FunctionCall const& _call,
+		bytes const& _output,
+		bool _renderResult,
+		bool _highlight
+	) const;
+
 	/// Formats the given parameters using their raw string representation.
 	std::string formatRawParameters(
 		ParameterList const& _params,