From 1861843a24d1a4aa62e20a3cfdab383131a4ebfb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <pawel.bylica@imapp.pl>
Date: Wed, 14 Jan 2015 09:08:17 +0100
Subject: [PATCH] EVM JIT called from Go, env_sha3 callback works

---
 libevmjit/CMakeLists.txt               |  3 +-
 libevmjit/ExecutionEngine.cpp          |  2 +-
 libevmjit/interface.cpp                | 63 ++++++++++++++++++++++++++
 libevmjit/{interface.c => interface.h} | 17 ++++++-
 4 files changed, 82 insertions(+), 3 deletions(-)
 create mode 100644 libevmjit/interface.cpp
 rename libevmjit/{interface.c => interface.h} (87%)

diff --git a/libevmjit/CMakeLists.txt b/libevmjit/CMakeLists.txt
index 7c35169a7..28b501ee3 100644
--- a/libevmjit/CMakeLists.txt
+++ b/libevmjit/CMakeLists.txt
@@ -10,7 +10,8 @@ if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
 	set_source_files_properties(Cache.cpp PROPERTIES COMPILE_FLAGS -fno-rtti)
 endif ()
 
-add_library(${TARGET_NAME} ${SOURCES} ${HEADERS})
+link_directories(/usr/lib/llvm-3.5/lib)
+add_library(${TARGET_NAME} SHARED ${SOURCES} ${HEADERS})
 set_property(TARGET ${TARGET_NAME} PROPERTY FOLDER "libs")
 
 include_directories(${LLVM_INCLUDE_DIRS})
diff --git a/libevmjit/ExecutionEngine.cpp b/libevmjit/ExecutionEngine.cpp
index 7e99932c3..71142fbee 100644
--- a/libevmjit/ExecutionEngine.cpp
+++ b/libevmjit/ExecutionEngine.cpp
@@ -49,7 +49,7 @@ ReturnCode runEntryFunc(EntryFuncPtr _mainFunc, Runtime* _runtime)
 
 std::string codeHash(bytes const& _code)
 {
-	std::array<dev::eth::jit::byte, 32> binHash;
+	std::array<byte, 32> binHash;
 	env_sha3(_code.data(), _code.size(), &binHash);
 
 	std::ostringstream os;
diff --git a/libevmjit/interface.cpp b/libevmjit/interface.cpp
new file mode 100644
index 000000000..ec7d07b33
--- /dev/null
+++ b/libevmjit/interface.cpp
@@ -0,0 +1,63 @@
+#include "interface.h"
+#include <cstdio>
+#include "ExecutionEngine.h"
+
+extern "C"
+{
+
+int evmjit_run()
+{
+	using namespace dev::eth::jit;
+
+	ExecutionEngine engine;
+	u256 gas = 100000;
+
+	bytes bytecode = { 0x60, 0x01 };
+
+	// Create random runtime data
+	RuntimeData data;
+	data.set(RuntimeData::Gas, gas);
+	data.set(RuntimeData::Address, 0);
+	data.set(RuntimeData::Caller, 0);
+	data.set(RuntimeData::Origin, 0);
+	data.set(RuntimeData::CallValue, 0xabcd);
+	data.set(RuntimeData::CallDataSize, 3);
+	data.set(RuntimeData::GasPrice, 1003);
+	data.set(RuntimeData::CoinBase, 0);
+	data.set(RuntimeData::TimeStamp, 1005);
+	data.set(RuntimeData::Number, 1006);
+	data.set(RuntimeData::Difficulty, 16);
+	data.set(RuntimeData::GasLimit, 1008);
+	data.set(RuntimeData::CodeSize, bytecode.size());
+	data.callData = (uint8_t*)"abc";
+	data.code = bytecode.data();
+
+	// BROKEN: env_* functions must be implemented & RuntimeData struct created
+	// TODO: Do not compile module again
+	auto result = engine.run(bytecode, &data, nullptr);
+	return static_cast<int>(result);
+}
+
+// Runtime callback functions  - implementations must be provided by external language (Go, C++, Python)
+void evm_jit_rt_sload(evm_jit_rt* _rt, i256* _index, i256* _ret);
+void evm_jit_rt_sstore(evm_jit_rt* _rt, i256* _index, i256* _value);
+void evm_jit_rt_balance(evm_jit_rt* _rt, h256* _address, i256* _ret);
+// And so on...
+
+evm_jit* evm_jit_create(evm_jit_rt*)
+{
+	printf("EVM JIT create");
+
+	int* a = nullptr;
+	*a = 1;
+
+	return nullptr;
+}
+
+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);
+
+}
diff --git a/libevmjit/interface.c b/libevmjit/interface.h
similarity index 87%
rename from libevmjit/interface.c
rename to libevmjit/interface.h
index 47589578b..0e3076283 100644
--- a/libevmjit/interface.c
+++ b/libevmjit/interface.h
@@ -1,4 +1,10 @@
-#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int evmjit_run();
 
 // JIT object opaque type
 typedef struct evm_jit evm_jit;
@@ -9,6 +15,11 @@ typedef int evm_jit_return_code;
 // Host-endian 256-bit integer type
 typedef struct i256 i256;
 
+struct h256
+{
+	char b[33];
+};
+
 // Big-endian right aligned 256-bit hash
 typedef struct h256 h256;
 
@@ -28,3 +39,7 @@ 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