Kill steps limit option in VM.

evmjit/libevmjit-cpp/JitVM.cpp

@@ -18,7 +18,7 @@ namespace eth
 
 extern "C" void env_sload(); // fake declaration for linker symbol stripping workaround, see a call below
 
-bytesConstRef JitVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _step)
+bytesConstRef JitVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp)
 {
 	using namespace jit;
 
@@ -33,7 +33,7 @@ bytesConstRef JitVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _on
 	{
 		cwarn << "Execution rejected by EVM JIT (gas limit: " << io_gas << "), executing with interpreter";
 		m_fallbackVM = VMFactory::create(VMKind::Interpreter);
-		return m_fallbackVM->execImpl(io_gas, _ext, _onOp, _step);
+		return m_fallbackVM->execImpl(io_gas, _ext, _onOp);
 	}
 
 	m_data.gas 			= static_cast<decltype(m_data.gas)>(io_gas);

evmjit/libevmjit-cpp/JitVM.h

@@ -11,7 +11,7 @@ namespace eth
 class JitVM: public VMFace
 {
 public:
-	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps) override final;
+	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp) override final;
 
 private:
 	jit::RuntimeData m_data;

libethereum/Executive.cpp

@@ -246,10 +246,6 @@ bool Executive::go(OnOpFunc const& _onOp)
 					vm->exec(m_gas, *m_ext, m_outRef, _onOp); // take only expected output
 			}
 		}
-		catch (StepsDone const&)
-		{
-			return false;
-		}
 		catch (VMException const& _e)
 		{
 			clog(StateSafeExceptions) << "Safe VM Exception. " << diagnostic_information(_e);

libevm/SmartVM.cpp

@@ -41,7 +41,7 @@ namespace
 	}
 }
 
-bytesConstRef SmartVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps)
+bytesConstRef SmartVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp)
 {
 	auto codeHash = sha3(_ext.code);
 	auto vmKind = VMKind::Interpreter; // default VM
@@ -68,7 +68,7 @@ bytesConstRef SmartVM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _
 	// TODO: Selected VM must be kept only because it returns reference to its internal memory.
 	//       VM implementations should be stateless, without escaping memory reference.
 	m_selectedVM = VMFactory::create(vmKind);
-	return m_selectedVM->execImpl(io_gas, _ext, _onOp, _steps);
+	return m_selectedVM->execImpl(io_gas, _ext, _onOp);
 }
 
 }

libevm/SmartVM.h

@@ -31,7 +31,7 @@ namespace eth
 class SmartVM: public VMFace
 {
 public:
-	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps) override final;
+	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp) override final;
 
 private:
 	std::unique_ptr<VMFace> m_selectedVM;

libevm/VM.cpp

@@ -45,7 +45,7 @@ static array<InstructionMetric, 256> metrics()
 	return s_ret;
 }
 
-bytesConstRef VM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps)
+bytesConstRef VM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp)
 {
 	// Reset leftovers from possible previous run
 	m_curPC = 0;
@@ -73,8 +73,7 @@ bytesConstRef VM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp,
 				i += _ext.code[i] - (unsigned)Instruction::PUSH1 + 1;
 		}
 	u256 nextPC = m_curPC + 1;
-	auto osteps = _steps;
-	for (bool stopped = false; !stopped && _steps--; m_curPC = nextPC, nextPC = m_curPC + 1)
+	for (uint64_t steps = 0; true; m_curPC = nextPC, nextPC = m_curPC + 1, ++steps)
 	{
 		// INSTRUCTION...
 		Instruction inst = (Instruction)_ext.getCode(m_curPC);
@@ -97,7 +96,7 @@ bytesConstRef VM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp,
 		auto onOperation = [&]()
 		{
 			if (_onOp)
-				_onOp(osteps - _steps - 1, inst, newTempSize > m_temp.size() ? (newTempSize - m_temp.size()) / 32 : bigint(0), runGas, io_gas, this, &_ext);
+				_onOp(steps, inst, newTempSize > m_temp.size() ? (newTempSize - m_temp.size()) / 32 : bigint(0), runGas, io_gas, this, &_ext);
 		};
 
 		switch (inst)
@@ -670,7 +669,5 @@ bytesConstRef VM::execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp,
 		}
 	}
 
-	if (_steps == (uint64_t)-1)
-		BOOST_THROW_EXCEPTION(StepsDone());
 	return bytesConstRef();
 }

libevm/VM.h

@@ -52,7 +52,7 @@ inline u256 fromAddress(Address _a)
 class VM: public VMFace
 {
 public:
-	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps) override final;
+	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp) override final;
 
 	u256 curPC() const { return m_curPC; }
 

libevm/VMFace.h

@@ -26,7 +26,6 @@ namespace eth
 {
 
 struct VMException: virtual Exception {};
-struct StepsDone: virtual VMException {};
 struct BreakPointHit: virtual VMException {};
 struct BadInstruction: virtual VMException {};
 struct BadJumpDestination: virtual VMException {};
@@ -46,19 +45,19 @@ public:
 	/// Execute EVM code by VM.
 	///
 	/// @param _out		Expected output
-	void exec(u256& io_gas, ExtVMFace& _ext, bytesRef _out, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1)
+	void exec(u256& io_gas, ExtVMFace& _ext, bytesRef _out, OnOpFunc const& _onOp = {})
 	{
-		execImpl(io_gas, _ext, _onOp, _steps).copyTo(_out);
+		execImpl(io_gas, _ext, _onOp).copyTo(_out);
 	}
 
 	/// The same as above but returns a copy of full output.
-	bytes exec(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1)
+	bytes exec(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp = {})
 	{
-		return execImpl(io_gas, _ext, _onOp, _steps).toVector();
+		return execImpl(io_gas, _ext, _onOp).toVector();
 	}
 
 	/// VM implementation
-	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps) = 0;
+	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp) = 0;
 };
 
 }