diff --git a/.gitignore b/.gitignore
index b6abc22a3..8d8974809 100644
--- a/.gitignore
+++ b/.gitignore
@@ -65,7 +65,6 @@ DerivedData
 project.pbxproj
 
 
-evmjit
 doc/html
 *.autosave
 node_modules/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1246e152..9bab77585 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -124,9 +124,7 @@ include(EthExecutableHelper)
 createBuildInfo()
 
 if (EVMJIT)
-	# Workaround for Ubuntu broken LLVM package
-	link_directories(/usr/lib/llvm-3.5/lib)
-	
+	set(EVMJIT_CPP TRUE) # include CPP-JIT connector
 	add_subdirectory(evmjit)
 endif()
 
diff --git a/evmjit/.gitignore b/evmjit/.gitignore
new file mode 100644
index 000000000..84c048a73
--- /dev/null
+++ b/evmjit/.gitignore
@@ -0,0 +1 @@
+/build/
diff --git a/evmjit/CMakeLists.txt b/evmjit/CMakeLists.txt
index 18601b921..519346007 100644
--- a/evmjit/CMakeLists.txt
+++ b/evmjit/CMakeLists.txt
@@ -4,8 +4,18 @@ project(evmjit)
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
+if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+else()
+	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -fPIC")
+endif()
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+	# Do not allow unresovled symbols in shared library (default on linux)
+	set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined")
+endif()
+
 # LLVM
-if(LLVM_DIR)	# local LLVM build
+if(LLVM_DIR OR APPLE)	# local LLVM build
 	find_package(LLVM REQUIRED CONFIG)
 	message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 	message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
@@ -18,11 +28,19 @@ else()
 	execute_process(COMMAND llvm-config-3.5 --includedir OUTPUT_VARIABLE LLVM_INCLUDE_DIRS)
 	message(STATUS "LLVM include dirs: ${LLVM_INCLUDE_DIRS}")
 	set(LLVM_LIBS "-lLLVMBitWriter -lLLVMX86CodeGen -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMInstCombine -lLLVMTransformUtils -lLLVMipa -lLLVMAnalysis -lLLVMX86AsmParser -lLLVMX86Desc -lLLVMX86Info -lLLVMX86AsmPrinter -lLLVMX86Utils -lLLVMMCJIT -lLLVMTarget -lLLVMRuntimeDyld -lLLVMObject -lLLVMMCParser -lLLVMBitReader -lLLVMExecutionEngine -lLLVMMC -lLLVMCore -lLLVMSupport -lz -lpthread -lffi -ltinfo -ldl -lm")
+	add_definitions(-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS)
+	link_directories(/usr/lib/llvm-3.5/lib)
 endif()
 
 # Boost
 find_package(Boost REQUIRED)
 
 add_subdirectory(libevmjit)
-add_subdirectory(libevmjit-cpp)
-add_subdirectory(evmcc)
+
+if(EVMJIT_CPP)
+	add_subdirectory(libevmjit-cpp)
+endif()
+
+if(EVMJIT_TOOLS)
+	add_subdirectory(evmcc)
+endif()
diff --git a/evmjit/libevmjit-cpp/Env.cpp b/evmjit/libevmjit-cpp/Env.cpp
index 6320aa222..90474c7e4 100644
--- a/evmjit/libevmjit-cpp/Env.cpp
+++ b/evmjit/libevmjit-cpp/Env.cpp
@@ -89,7 +89,7 @@ extern "C"
 		*o_hash = hash;
 	}
 
-	EXPORT byte const* env_getExtCode(ExtVMFace* _env, h256* _addr256, uint64_t* o_size)
+	EXPORT byte const* env_extcode(ExtVMFace* _env, h256* _addr256, uint64_t* o_size)
 	{
 		auto addr = right160(*_addr256);
 		auto& code = _env->codeAt(addr);
diff --git a/evmjit/libevmjit/BasicBlock.h b/evmjit/libevmjit/BasicBlock.h
index 7a5364a4e..cda4f89bd 100644
--- a/evmjit/libevmjit/BasicBlock.h
+++ b/evmjit/libevmjit/BasicBlock.h
@@ -57,7 +57,7 @@ public:
 	explicit BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest);
 
 	BasicBlock(const BasicBlock&) = delete;
-	void operator=(const BasicBlock&) = delete;
+	BasicBlock& operator=(const BasicBlock&) = delete;
 
 	llvm::BasicBlock* llvm() { return m_llvmBB; }
 
@@ -66,6 +66,9 @@ public:
 
 	bool isJumpDest() const { return m_isJumpDest; }
 
+	llvm::Value* getJumpTarget() const { return m_jumpTarget; }
+	void setJumpTarget(llvm::Value* _jumpTarget) { m_jumpTarget = _jumpTarget; }
+
 	LocalStack& localStack() { return m_stack; }
 
 	/// Optimization: propagates values between local stacks in basic blocks
@@ -112,6 +115,9 @@ private:
 	/// Is the basic block a valid jump destination.
 	/// JUMPDEST is the first instruction of the basic block.
 	bool const m_isJumpDest = false;
+
+	/// If block finishes with dynamic jump target index is stored here
+	llvm::Value* m_jumpTarget = nullptr;
 };
 
 }
diff --git a/evmjit/libevmjit/CMakeLists.txt b/evmjit/libevmjit/CMakeLists.txt
index 7c35169a7..c1acfc409 100644
--- a/evmjit/libevmjit/CMakeLists.txt
+++ b/evmjit/libevmjit/CMakeLists.txt
@@ -2,23 +2,24 @@ set(TARGET_NAME evmjit)
 
 file(GLOB SOURCES "*.cpp")
 file(GLOB HEADERS "*.h")
+set(INTERFACE_HEADERS interface.h)
 source_group("" FILES ${HEADERS})
 source_group("" FILES ${SOURCES})
 
 if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
 	# Disable rtti for Cache as LLVM has no rtti
 	set_source_files_properties(Cache.cpp PROPERTIES COMPILE_FLAGS -fno-rtti)
-endif ()
+endif()
 
-add_library(${TARGET_NAME} ${SOURCES} ${HEADERS})
+add_library(${TARGET_NAME} SHARED ${SOURCES} ${HEADERS})
 set_property(TARGET ${TARGET_NAME} PROPERTY FOLDER "libs")
 
 include_directories(${LLVM_INCLUDE_DIRS})
 include_directories(${Boost_INCLUDE_DIRS})
 
-target_link_libraries(${TARGET_NAME} ${LLVM_LIBS})
+target_link_libraries(${TARGET_NAME} PRIVATE ${LLVM_LIBS})
 
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
 
-#install( TARGETS ${EXECUTABLE} ARCHIVE DESTINATION lib LIBRARY DESTINATION lib )
-#install( FILES ${HEADERS} DESTINATION include/${EXECUTABLE} )
+install(TARGETS ${TARGET_NAME} LIBRARY DESTINATION lib)
+install(FILES ${INTERFACE_HEADERS} DESTINATION include/${TARGET_NAME})
diff --git a/evmjit/libevmjit/Cache.cpp b/evmjit/libevmjit/Cache.cpp
index 0b725bc24..0e6fb517a 100644
--- a/evmjit/libevmjit/Cache.cpp
+++ b/evmjit/libevmjit/Cache.cpp
@@ -36,6 +36,20 @@ std::unique_ptr<llvm::Module> Cache::getObject(std::string const& id)
 	llvm::sys::path::system_temp_directory(false, cachePath);
 	llvm::sys::path::append(cachePath, "evm_objs", id);
 
+#if defined(__GNUC__) && !defined(NDEBUG)
+	llvm::sys::fs::file_status st;
+	auto err = llvm::sys::fs::status(cachePath.str(), st);
+	if (err)
+		return nullptr;
+	auto mtime = st.getLastModificationTime().toEpochTime();
+
+	std::tm tm;
+	strptime(__DATE__ __TIME__, " %b %d %Y %H:%M:%S", &tm);
+	auto btime = (uint64_t)std::mktime(&tm);
+	if (btime > mtime)
+		return nullptr;
+#endif
+
 	if (auto r = llvm::MemoryBuffer::getFile(cachePath.str(), -1, false))
 		lastObject = llvm::MemoryBuffer::getMemBufferCopy(r.get()->getBuffer());
 	else if (r.getError() != std::make_error_code(std::errc::no_such_file_or_directory))
diff --git a/evmjit/libevmjit/Compiler.cpp b/evmjit/libevmjit/Compiler.cpp
index 26c78b4ca..1d00fd225 100644
--- a/evmjit/libevmjit/Compiler.cpp
+++ b/evmjit/libevmjit/Compiler.cpp
@@ -100,7 +100,7 @@ llvm::BasicBlock* Compiler::getJumpTableBlock()
 		m_jumpTableBlock.reset(new BasicBlock("JumpTable", m_mainFunc, m_builder, true));
 		InsertPointGuard g{m_builder};
 		m_builder.SetInsertPoint(m_jumpTableBlock->llvm());
-		auto dest = m_jumpTableBlock->localStack().pop();
+		auto dest = m_builder.CreatePHI(Type::Word, 8, "target");
 		auto switchInstr = m_builder.CreateSwitch(dest, getBadJumpBlock());
 		for (auto&& p : m_basicBlocks)
 		{
@@ -165,6 +165,26 @@ std::unique_ptr<llvm::Module> Compiler::compile(bytes const& _bytecode, std::str
 
 	removeDeadBlocks();
 
+	// Link jump table target index
+	if (m_jumpTableBlock)
+	{
+		auto phi = llvm::cast<llvm::PHINode>(&m_jumpTableBlock->llvm()->getInstList().front());
+		for (auto predIt = llvm::pred_begin(m_jumpTableBlock->llvm()); predIt != llvm::pred_end(m_jumpTableBlock->llvm()); ++predIt)
+		{
+			BasicBlock* pred = nullptr;
+			for (auto&& p : m_basicBlocks)
+			{
+				if (p.second.llvm() == *predIt)
+				{
+					pred = &p.second;
+					break;
+				}
+			}
+
+			phi->addIncoming(pred->getJumpTarget(), pred->llvm());
+		}
+	}
+
 	dumpCFGifRequired("blocks-init.dot");
 
 	if (m_options.optimizeStack)
@@ -394,7 +414,8 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
 
 			value = Endianness::toBE(m_builder, value);
 			auto bytes = m_builder.CreateBitCast(value, llvm::VectorType::get(Type::Byte, 32), "bytes");
-			auto byte = m_builder.CreateExtractElement(bytes, byteNum, "byte");
+			auto safeByteNum = m_builder.CreateZExt(m_builder.CreateTrunc(byteNum, m_builder.getIntNTy(5)), Type::lowPrecision); // Trim index, large values can crash
+			auto byte = m_builder.CreateExtractElement(bytes, safeByteNum, "byte");
 			value = m_builder.CreateZExt(byte, Type::Word);
 
 			auto byteNumValid = m_builder.CreateICmpULT(byteNum, Constant::get(32));
@@ -564,7 +585,7 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
 				}
 				else
 				{
-					stack.push(target);
+					_basicBlock.setJumpTarget(target);
 					m_builder.CreateBr(getJumpTableBlock());
 				}
 			}
@@ -580,7 +601,7 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
 				}
 				else
 				{
-					stack.push(target);
+					_basicBlock.setJumpTarget(target);
 					m_builder.CreateCondBr(cond, getJumpTableBlock(), _nextBasicBlock);
 				}
 			}
diff --git a/evmjit/libevmjit/ExecutionEngine.cpp b/evmjit/libevmjit/ExecutionEngine.cpp
index 7e99932c3..b6b140fd5 100644
--- a/evmjit/libevmjit/ExecutionEngine.cpp
+++ b/evmjit/libevmjit/ExecutionEngine.cpp
@@ -19,7 +19,12 @@
 #include "Compiler.h"
 #include "Cache.h"
 
-extern "C" void env_sha3(dev::eth::jit::byte const* _begin, uint64_t _size, std::array<dev::eth::jit::byte, 32>* o_hash);
+#if defined(NDEBUG)
+#define DEBUG_ENV_OPTION(name) false
+#else
+#include <cstdlib>
+#define DEBUG_ENV_OPTION(name) (std::getenv(#name) != nullptr)
+#endif
 
 namespace dev
 {
@@ -49,14 +54,17 @@ ReturnCode runEntryFunc(EntryFuncPtr _mainFunc, Runtime* _runtime)
 
 std::string codeHash(bytes const& _code)
 {
-	std::array<dev::eth::jit::byte, 32> binHash;
-	env_sha3(_code.data(), _code.size(), &binHash);
-
-	std::ostringstream os;
-	for (auto i: binHash)
-		os << std::hex << std::setfill('0') << std::setw(2) << (int)(std::make_unsigned<decltype(i)>::type)i;
-
-	return os.str();
+	uint32_t hash = 0;
+	for (auto b : _code)
+	{
+		hash += b;
+		hash += (hash << 10);
+		hash ^= (hash >> 6);
+	}
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+	return std::to_string(hash);
 }
 
 }
@@ -64,6 +72,8 @@ std::string codeHash(bytes const& _code)
 ReturnCode ExecutionEngine::run(bytes const& _code, RuntimeData* _data, Env* _env)
 {
 	static std::unique_ptr<llvm::ExecutionEngine> ee;  // TODO: Use Managed Objects from LLVM?
+	static auto debugDumpModule = DEBUG_ENV_OPTION(EVMJIT_DUMP_MODULE);
+	static bool objectCacheEnabled = !DEBUG_ENV_OPTION(EVMJIT_CACHE_OFF);
 
 	auto mainFuncName = codeHash(_code);
 	EntryFuncPtr entryFuncPtr{};
@@ -74,14 +84,14 @@ ReturnCode ExecutionEngine::run(bytes const& _code, RuntimeData* _data, Env* _en
 	}
 	else
 	{
-		bool objectCacheEnabled = true;
 		auto objectCache = objectCacheEnabled ? Cache::getObjectCache() : nullptr;
 		std::unique_ptr<llvm::Module> module;
 		if (objectCache)
 			module = Cache::getObject(mainFuncName);
 		if (!module)
 			module = Compiler({}).compile(_code, mainFuncName);
-		//module->dump();
+		if (debugDumpModule)
+			module->dump();
 		if (!ee)
 		{
 			llvm::InitializeNativeTarget();
@@ -92,7 +102,7 @@ ReturnCode ExecutionEngine::run(bytes const& _code, RuntimeData* _data, Env* _en
 			builder.setUseMCJIT(true);
 			std::unique_ptr<llvm::SectionMemoryManager> memoryManager(new llvm::SectionMemoryManager);
 			builder.setMCJITMemoryManager(memoryManager.get());
-			builder.setOptLevel(llvm::CodeGenOpt::Default);
+			builder.setOptLevel(llvm::CodeGenOpt::None);
 
 			auto triple = llvm::Triple(llvm::sys::getProcessTriple());
 			if (triple.getOS() == llvm::Triple::OSType::Win32)
diff --git a/evmjit/libevmjit/Ext.cpp b/evmjit/libevmjit/Ext.cpp
index aae68f43a..a37a6fe99 100644
--- a/evmjit/libevmjit/Ext.cpp
+++ b/evmjit/libevmjit/Ext.cpp
@@ -5,9 +5,6 @@
 #include <llvm/IR/TypeBuilder.h>
 #include <llvm/IR/IntrinsicInst.h>
 
-//#include <libdevcrypto/SHA3.h>
-//#include <libevm/FeeStructure.h>
-
 #include "RuntimeManager.h"
 #include "Memory.h"
 #include "Type.h"
@@ -23,12 +20,9 @@ namespace jit
 Ext::Ext(RuntimeManager& _runtimeManager, Memory& _memoryMan):
 	RuntimeHelper(_runtimeManager),
 	m_memoryMan(_memoryMan)
-#ifdef __MSCVER
-	,
-	m_funcs({}),  // The only std::array initialization that works in both Visual Studio & GCC
-	m_argAllocas({})
-#endif
 {
+	m_funcs = decltype(m_funcs)();
+	m_argAllocas = decltype(m_argAllocas)();
 	m_size = m_builder.CreateAlloca(Type::Size, nullptr, "env.size");
 }
 
@@ -74,7 +68,6 @@ llvm::Value* Ext::getArgAlloca()
 		getBuilder().SetInsertPoint(getMainFunction()->front().getFirstNonPHI());
 		a = getBuilder().CreateAlloca(Type::Word, nullptr, "arg");
 	}
-		
 	return a;
 }
 
diff --git a/evmjit/libevmjit/Runtime.h b/evmjit/libevmjit/Runtime.h
index 8cc5b7968..f97efa128 100644
--- a/evmjit/libevmjit/Runtime.h
+++ b/evmjit/libevmjit/Runtime.h
@@ -34,7 +34,7 @@ public:
 	Runtime(RuntimeData* _data, Env* _env);
 
 	Runtime(const Runtime&) = delete;
-	void operator=(const Runtime&) = delete;
+	Runtime& operator=(const Runtime&) = delete;
 
 	StackImpl& getStack() { return m_stack; }
 	MemoryImpl& getMemory() { return m_memory; }
diff --git a/evmjit/libevmjit/interface.cpp b/evmjit/libevmjit/interface.cpp
new file mode 100644
index 000000000..eef92d00f
--- /dev/null
+++ b/evmjit/libevmjit/interface.cpp
@@ -0,0 +1,34 @@
+#include "interface.h"
+#include <cstdio>
+#include "ExecutionEngine.h"
+
+extern "C"
+{
+
+evmjit_result evmjit_run(void* _data, void* _env)
+{
+	using namespace dev::eth::jit;
+
+	auto data = static_cast<RuntimeData*>(_data);
+
+	ExecutionEngine engine;
+
+	auto codePtr = data->code;
+	auto codeSize = data->elems[RuntimeData::CodeSize].a;
+	bytes bytecode;
+	bytecode.insert(bytecode.end(), codePtr, codePtr + codeSize);
+
+	auto returnCode = engine.run(bytecode, data, static_cast<Env*>(_env));
+	evmjit_result result = {static_cast<int32_t>(returnCode), 0, nullptr};
+	if (returnCode == ReturnCode::Return && !engine.returnData.empty())
+	{
+		// TODO: Optimized returning data. Allocating memory on client side by callback function might be a good idea
+		result.returnDataSize = engine.returnData.size();
+		result.returnData = std::malloc(result.returnDataSize);
+		std::memcpy(result.returnData, engine.returnData.data(), result.returnDataSize);
+	}
+
+	return result;
+}
+
+}
diff --git a/evmjit/libevmjit/interface.c b/evmjit/libevmjit/interface.h
similarity index 76%
rename from evmjit/libevmjit/interface.c
rename to evmjit/libevmjit/interface.h
index 47589578b..5d9307ab2 100644
--- a/evmjit/libevmjit/interface.c
+++ b/evmjit/libevmjit/interface.h
@@ -1,5 +1,20 @@
+#include <stddef.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct evmjit_result
+{
+	int32_t  returnCode;
+	uint64_t returnDataSize;
+	void*    returnData;
+
+} evmjit_result;
+
+evmjit_result evmjit_run(void* _data, void* _env);
+
 // JIT object opaque type
 typedef struct evm_jit evm_jit;
 
@@ -9,6 +24,11 @@ typedef int evm_jit_return_code;
 // Host-endian 256-bit integer type
 typedef struct i256 i256;
 
+struct i256
+{
+	char b[33];
+};
+
 // Big-endian right aligned 256-bit hash
 typedef struct h256 h256;
 
@@ -28,3 +48,7 @@ evm_jit_return_code evm_jit_execute(evm_jit* _jit);
 void evm_jit_get_return_data(evm_jit* _jit, char* _return_data_offset, size_t* _return_data_size);
 
 void evm_jit_destroy(evm_jit* _jit);
+
+#ifdef __cplusplus
+}
+#endif