diff --git a/evmcc/evmcc.cpp b/evmcc/evmcc.cpp
index 8a7ac5384..600980d44 100644
--- a/evmcc/evmcc.cpp
+++ b/evmcc/evmcc.cpp
@@ -94,7 +94,7 @@ int main(int argc, char** argv)
     if (opt_compile)
     {
     	auto compiler = eth::jit::Compiler();
-		auto module = compiler.compile(bytecode);
+		auto module = compiler.compile({bytecode.data(), bytecode.size()});
 		llvm::raw_os_ostream out(std::cout);
 		module->print(out, nullptr);
 
@@ -110,7 +110,7 @@ int main(int argc, char** argv)
 	if (opt_interpret)
 	{
 		auto engine = eth::jit::ExecutionEngine();
-		auto module = eth::jit::Compiler().compile(bytecode);
+		auto module = eth::jit::Compiler().compile({bytecode.data(), bytecode.size()});
 		module->dump();
 		auto result = engine.run(std::move(module));
 		return result;
diff --git a/libevmjit/Compiler.cpp b/libevmjit/Compiler.cpp
index 035abf287..cbb6118f4 100644
--- a/libevmjit/Compiler.cpp
+++ b/libevmjit/Compiler.cpp
@@ -29,7 +29,7 @@ Compiler::Compiler():
 	Type::init(m_builder.getContext());
 }
 
-void Compiler::createBasicBlocks(const bytes& bytecode)
+void Compiler::createBasicBlocks(bytesConstRef bytecode)
 {
 	std::set<ProgramCounter> splitPoints; // Sorted collections of instruction indices where basic blocks start/end
 	splitPoints.insert(0);	// First basic block
@@ -38,9 +38,9 @@ void Compiler::createBasicBlocks(const bytes& bytecode)
 	std::vector<ProgramCounter> indirectJumpTargets;
 	boost::dynamic_bitset<> validJumpTargets(bytecode.size());
 
-	for (auto curr = bytecode.cbegin(); curr != bytecode.cend(); ++curr)
+	for (auto curr = bytecode.begin(); curr != bytecode.end(); ++curr)
 	{
-		ProgramCounter currentPC = curr - bytecode.cbegin();
+		ProgramCounter currentPC = curr - bytecode.begin();
 		validJumpTargets[currentPC] = 1;
 
 		auto inst = static_cast<Instruction>(*curr);
@@ -51,7 +51,7 @@ void Compiler::createBasicBlocks(const bytes& bytecode)
 		{
 			auto numBytes = static_cast<size_t>(inst) - static_cast<size_t>(Instruction::PUSH1) + 1;
 			auto next = curr + numBytes + 1;
-			if (next >= bytecode.cend())
+			if (next >= bytecode.end())
 				break;
 
 			auto nextInst = static_cast<Instruction>(*next);
@@ -72,7 +72,7 @@ void Compiler::createBasicBlocks(const bytes& bytecode)
 					targetPC = bytecode.size();
 				splitPoints.insert(targetPC);
 
-				ProgramCounter jumpPC = (next - bytecode.cbegin());
+				ProgramCounter jumpPC = (next - bytecode.begin());
 				directJumpTargets[jumpPC] = targetPC;
 			}
 
@@ -95,7 +95,7 @@ void Compiler::createBasicBlocks(const bytes& bytecode)
 		case Instruction::SUICIDE:
 		{
 			// Create a basic block starting at the following instruction.
-			if (curr + 1 < bytecode.cend())
+			if (curr + 1 < bytecode.end())
 			{
 				splitPoints.insert(currentPC + 1);
 			}
@@ -149,7 +149,7 @@ void Compiler::createBasicBlocks(const bytes& bytecode)
 	}
 }
 
-std::unique_ptr<llvm::Module> Compiler::compile(const bytes& bytecode)
+std::unique_ptr<llvm::Module> Compiler::compile(bytesConstRef bytecode)
 {
 	auto module = std::make_unique<llvm::Module>("main", m_builder.getContext());
 
@@ -214,7 +214,7 @@ std::unique_ptr<llvm::Module> Compiler::compile(const bytes& bytecode)
 }
 
 
-void Compiler::compileBasicBlock(BasicBlock& basicBlock, const bytes& bytecode, Memory& memory, Ext& ext, GasMeter& gasMeter, llvm::BasicBlock* nextBasicBlock)
+void Compiler::compileBasicBlock(BasicBlock& basicBlock, bytesConstRef bytecode, Memory& memory, Ext& ext, GasMeter& gasMeter, llvm::BasicBlock* nextBasicBlock)
 {
 	auto& stack = basicBlock.getStack();
 	m_builder.SetInsertPoint(basicBlock.llvm());
diff --git a/libevmjit/Compiler.h b/libevmjit/Compiler.h
index bda154689..f708898d6 100644
--- a/libevmjit/Compiler.h
+++ b/libevmjit/Compiler.h
@@ -22,16 +22,16 @@ public:
 
 	Compiler();
 
-	std::unique_ptr<llvm::Module> compile(const bytes& bytecode);
+	std::unique_ptr<llvm::Module> compile(bytesConstRef bytecode);
 
 	void dumpBasicBlockGraph(std::ostream& out);
 
 
 private:
 
-	void createBasicBlocks(const bytes& bytecode);
+	void createBasicBlocks(bytesConstRef bytecode);
 
-	void compileBasicBlock(BasicBlock& basicBlock, const bytes& bytecode, class Memory& memory, class Ext& ext, class GasMeter& gasMeter, llvm::BasicBlock* nextBasicBlock);
+	void compileBasicBlock(BasicBlock& basicBlock, bytesConstRef bytecode, class Memory& memory, class Ext& ext, class GasMeter& gasMeter, llvm::BasicBlock* nextBasicBlock);
 
 	void linkBasicBlocks();
 
diff --git a/libevmjit/ExecutionEngine.cpp b/libevmjit/ExecutionEngine.cpp
index 6a494f42a..bac15a478 100644
--- a/libevmjit/ExecutionEngine.cpp
+++ b/libevmjit/ExecutionEngine.cpp
@@ -125,7 +125,7 @@ int ExecutionEngine::run(std::unique_ptr<llvm::Module> _module)
 
 	if (returnCode == ReturnCode::Return)
 	{
-		auto&& returnData = Memory::getReturnData(); // TODO: It might be better to place is in Runtime interface
+		returnData = Memory::getReturnData().toVector(); // TODO: It might be better to place is in Runtime interface
 
 		std::cout << "RETURN [ ";
 		for (auto it = returnData.begin(), end = returnData.end(); it != end; ++it)
diff --git a/libevmjit/ExecutionEngine.h b/libevmjit/ExecutionEngine.h
index 158df0283..f6fb49276 100644
--- a/libevmjit/ExecutionEngine.h
+++ b/libevmjit/ExecutionEngine.h
@@ -18,6 +18,8 @@ public:
 	ExecutionEngine();
 
 	int run(std::unique_ptr<llvm::Module> module);
+
+	bytes returnData;
 };
 
 }
diff --git a/libevmjit/VM.cpp b/libevmjit/VM.cpp
new file mode 100644
index 000000000..51cd7c5a3
--- /dev/null
+++ b/libevmjit/VM.cpp
@@ -0,0 +1,37 @@
+
+#include "VM.h"
+
+#include <libevm/VM.h>
+
+#include "ExecutionEngine.h"
+#include "Compiler.h"
+
+namespace dev
+{
+namespace eth
+{
+namespace jit
+{
+
+bytes VM::go(ExtVMFace& _ext)
+{
+	auto module = Compiler().compile(_ext.code);
+	module->dump();
+
+	ExecutionEngine engine;
+	auto exitCode = engine.run(std::move(module));
+
+	switch (exitCode)
+	{
+	case 101:
+		BOOST_THROW_EXCEPTION(BadJumpDestination());
+	case 102:
+		BOOST_THROW_EXCEPTION(OutOfGas());
+	}
+
+	return std::move(engine.returnData);
+}
+
+}
+}
+}
diff --git a/libevmjit/VM.h b/libevmjit/VM.h
new file mode 100644
index 000000000..3e7884b10
--- /dev/null
+++ b/libevmjit/VM.h
@@ -0,0 +1,32 @@
+
+#pragma once
+
+#include <libdevcore/Common.h>
+#include <libevm/ExtVMFace.h>
+
+namespace dev
+{
+namespace eth
+{
+namespace jit
+{
+
+class VM
+{
+public:
+	/// Construct VM object.
+	explicit VM(u256 _gas = 0): m_gas(_gas) {}
+
+	void reset(u256 _gas = 0) { m_gas = _gas; }
+
+	bytes go(ExtVMFace& _ext);
+
+	u256 gas() const { return m_gas; }
+
+private:
+	u256 m_gas = 0;
+};
+
+}
+}
+}
diff --git a/windows/LibEvmJit.vcxproj b/windows/LibEvmJit.vcxproj
index 17832d871..1c71bb082 100644
--- a/windows/LibEvmJit.vcxproj
+++ b/windows/LibEvmJit.vcxproj
@@ -133,6 +133,7 @@
     <ClCompile Include="..\libevmjit\Runtime.cpp" />
     <ClCompile Include="..\libevmjit\Type.cpp" />
     <ClCompile Include="..\libevmjit\Utils.cpp" />
+    <ClCompile Include="..\libevmjit\VM.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\libevmjit\BasicBlock.h" />
@@ -145,6 +146,7 @@
     <ClInclude Include="..\libevmjit\Runtime.h" />
     <ClInclude Include="..\libevmjit\Type.h" />
     <ClInclude Include="..\libevmjit\Utils.h" />
+    <ClInclude Include="..\libevmjit\VM.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/windows/LibEvmJit.vcxproj.filters b/windows/LibEvmJit.vcxproj.filters
index e24e4379e..a2008f971 100644
--- a/windows/LibEvmJit.vcxproj.filters
+++ b/windows/LibEvmJit.vcxproj.filters
@@ -36,6 +36,9 @@
     <ClCompile Include="..\libevmjit\Utils.cpp">
       <Filter>libevmjit</Filter>
     </ClCompile>
+    <ClCompile Include="..\libevmjit\VM.cpp">
+      <Filter>libevmjit</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\libevmjit\BasicBlock.h">
@@ -68,5 +71,8 @@
     <ClInclude Include="..\libevmjit\Utils.h">
       <Filter>libevmjit</Filter>
     </ClInclude>
+    <ClInclude Include="..\libevmjit\VM.h">
+      <Filter>libevmjit</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file