Merge pull request #6398 from ethereum/yulInterpreter-maxSteps

yulInterpreter: Add timeout based on the number of interpreted statem…

test/libyul/YulInterpreterTest.cpp

@@ -130,12 +130,14 @@ string YulInterpreterTest::interpret()
 {
 	InterpreterState state;
 	state.maxTraceSize = 10000;
+	state.maxSteps = 10000;
+	state.maxMemSize = 0x20000000;
 	Interpreter interpreter(state);
 	try
 	{
 		interpreter(*m_ast);
 	}
-	catch (InterpreterTerminated const&)
+	catch (InterpreterTerminatedGeneric const&)
 	{
 	}
 

test/tools/ossfuzz/strictasm_diff_ossfuzz.cpp

@@ -76,9 +76,26 @@ extern "C" int LLVMFuzzerTestOneInput(uint8_t const* _data, size_t _size)
 
 	ostringstream os1;
 	ostringstream os2;
+	try
+	{
 		yulFuzzerUtil::interpret(os1, stack.parserResult()->code);
+	}
+	catch (yul::test::StepLimitReached const&)
+	{
+		return 0;
+	}
+	catch (yul::test::InterpreterTerminatedGeneric const&)
+	{
+	}
+
 	stack.optimize();
+	try
+	{
 		yulFuzzerUtil::interpret(os2, stack.parserResult()->code);
+	}
+	catch (yul::test::InterpreterTerminatedGeneric const&)
+	{
+	}
 
 	bool isTraceEq = (os1.str() == os2.str());
 	yulAssert(isTraceEq, "Interpreted traces for optimized and unoptimized code differ.");

test/tools/ossfuzz/yulFuzzerCommon.cpp

@@ -24,16 +24,9 @@ void yulFuzzerUtil::interpret(ostream& _os, shared_ptr<yul::Block> _ast)
 {
 	InterpreterState state;
 	state.maxTraceSize = 75;
-	state.maxSteps = 10000;
+	state.maxSteps = 100;
 	Interpreter interpreter(state);
-	try
-	{
 	interpreter(*_ast);
-	}
-	catch (InterpreterTerminated const&)
-	{
-	}
-
 	_os << "Trace:" << endl;
 	for (auto const& line: interpreter.trace())
 		_os << "  " << line << endl;

test/tools/ossfuzz/yulProto_diff_ossfuzz.cpp

@@ -72,9 +72,26 @@ DEFINE_PROTO_FUZZER(Function const& _input)
 
 	ostringstream os1;
 	ostringstream os2;
+	try
+	{
 		yulFuzzerUtil::interpret(os1, stack.parserResult()->code);
+	}
+	catch (yul::test::StepLimitReached const&)
+	{
+		return;
+	}
+	catch (yul::test::InterpreterTerminatedGeneric const&)
+	{
+	}
+
 	stack.optimize();
+	try
+	{
 		yulFuzzerUtil::interpret(os2, stack.parserResult()->code);
+	}
+	catch (yul::test::InterpreterTerminatedGeneric const&)
+	{
+	}
 
 	bool isTraceEq = (os1.str() == os2.str());
 	yulAssert(isTraceEq, "Interpreted traces for optimized and unoptimized code differ.");

test/tools/yulInterpreter/EVMInstructionInterpreter.cpp

@@ -106,7 +106,7 @@ u256 EVMInstructionInterpreter::eval(
 	switch (_instruction)
 	{
 	case Instruction::STOP:
-		throw InterpreterTerminated();
+		throw ExplicitlyTerminated();
 	// --------------- arithmetic ---------------
 	case Instruction::ADD:
 		return arg[0] + arg[1];
@@ -342,18 +342,18 @@ u256 EVMInstructionInterpreter::eval(
 		if (logMemoryRead(arg[0], arg[1]))
 			data = bytesConstRef(m_state.memory.data() + size_t(arg[0]), size_t(arg[1])).toBytes();
 		logTrace(_instruction, arg, data);
-		throw InterpreterTerminated();
+		throw ExplicitlyTerminated();
 	}
 	case Instruction::REVERT:
 		logMemoryRead(arg[0], arg[1]);
 		logTrace(_instruction, arg);
-		throw InterpreterTerminated();
+		throw ExplicitlyTerminated();
 	case Instruction::INVALID:
 		logTrace(_instruction);
-		throw InterpreterTerminated();
+		throw ExplicitlyTerminated();
 	case Instruction::SELFDESTRUCT:
 		logTrace(_instruction, arg);
-		throw InterpreterTerminated();
+		throw ExplicitlyTerminated();
 	case Instruction::POP:
 		break;
 	// --------------- invalid in strict assembly ---------------
@@ -492,6 +492,6 @@ void EVMInstructionInterpreter::logTrace(std::string const& _pseudoInstruction,
 	if (m_state.maxTraceSize > 0 && m_state.trace.size() >= m_state.maxTraceSize)
 	{
 		m_state.trace.emplace_back("Trace size limit reached.");
-		throw InterpreterTerminated();
+		throw TraceLimitReached();
 	}
 }

test/tools/yulInterpreter/Interpreter.cpp

@@ -132,7 +132,7 @@ void Interpreter::operator()(Block const& _block)
 	if (m_state.maxSteps > 0 && m_state.numSteps >= m_state.maxSteps)
 	{
 		m_state.trace.emplace_back("Interpreter execution step limit reached.");
-		throw InterpreterTerminated();
+		throw StepLimitReached();
 	}
 	openScope();
 	// Register functions.

test/tools/yulInterpreter/Interpreter.h

@@ -35,7 +35,19 @@ namespace yul
 namespace test
 {
 
-class InterpreterTerminated: dev::Exception
+class InterpreterTerminatedGeneric: public dev::Exception
+{
+};
+
+class ExplicitlyTerminated: public InterpreterTerminatedGeneric
+{
+};
+
+class StepLimitReached: public InterpreterTerminatedGeneric
+{
+};
+
+class TraceLimitReached: public InterpreterTerminatedGeneric
 {
 };
 

test/tools/yulrun.cpp

@@ -96,7 +96,7 @@ void interpret(string const& _source)
 	{
 		interpreter(*ast);
 	}
-	catch (InterpreterTerminated const&)
+	catch (InterpreterTerminatedGeneric const&)
 	{
 	}