From f3a347bdc8a6f4f1f7f2292570844239c17fa683 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <pawel.bylica@imapp.pl>
Date: Tue, 30 Sep 2014 17:11:50 +0200
Subject: [PATCH] Starting ExtVM binary interface

---
 evmcc/Compiler.cpp        |  3 +++
 evmcc/ExecutionEngine.cpp |  5 ++++
 evmcc/Ext.cpp             | 52 +++++++++++++++++++++++++++++++++++++++
 evmcc/Ext.h               | 22 +++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 evmcc/Ext.cpp
 create mode 100644 evmcc/Ext.h

diff --git a/evmcc/Compiler.cpp b/evmcc/Compiler.cpp
index 3cd12833f0..4237b59aa0 100644
--- a/evmcc/Compiler.cpp
+++ b/evmcc/Compiler.cpp
@@ -6,6 +6,7 @@
 #include <libevmface/Instruction.h>
 
 #include "Stack.h"
+#include "Ext.h"
 
 namespace evmcc
 {
@@ -56,6 +57,8 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 	// Init stack
 	auto stack = Stack(builder, module.get());
 
+	auto ext = Ext(builder);
+
 	for (auto pc = bytecode.cbegin(); pc != bytecode.cend(); ++pc)
 	{
 		using dev::eth::Instruction;
diff --git a/evmcc/ExecutionEngine.cpp b/evmcc/ExecutionEngine.cpp
index e59d6024a8..3b3205af44 100644
--- a/evmcc/ExecutionEngine.cpp
+++ b/evmcc/ExecutionEngine.cpp
@@ -13,6 +13,8 @@
 #include <llvm/Support/PrettyStackTrace.h>
 #include <llvm/Support/Host.h>
 
+#include "Ext.h"
+
 namespace evmcc
 {
 
@@ -66,6 +68,9 @@ int ExecutionEngine::run(std::unique_ptr<llvm::Module> _module)
 	_module.release();	// Successfully created llvm::ExecutionEngine takes ownership of the module
 	exec->finalizeObject();
 
+	auto ext = std::make_unique<dev::eth::ExtVMFace>();
+	Ext::init(std::move(ext));
+
 	auto entryFunc = module->getFunction("main");
 	if (!entryFunc)
 	{
diff --git a/evmcc/Ext.cpp b/evmcc/Ext.cpp
new file mode 100644
index 0000000000..1384694bee
--- /dev/null
+++ b/evmcc/Ext.cpp
@@ -0,0 +1,52 @@
+
+#include "Ext.h"
+
+#include <llvm/IR/Function.h>
+#include <llvm/IR/TypeBuilder.h>
+
+#ifdef _MSC_VER
+#define EXPORT __declspec(dllexport)
+#else
+#define EXPORT
+#endif
+
+using namespace llvm;
+using llvm::types::i;
+using Linkage = llvm::GlobalValue::LinkageTypes;
+
+namespace evmcc
+{
+
+std::unique_ptr<dev::eth::ExtVMFace> g_ext;
+
+void Ext::init(std::unique_ptr<dev::eth::ExtVMFace> _ext)
+{
+	g_ext = std::move(_ext);
+}
+
+Ext::Ext(llvm::IRBuilder<>& _builder)
+	: m_builder(_builder)
+{
+	auto module = m_builder.GetInsertBlock()->getParent()->getParent();
+	auto&& ctx = _builder.getContext();
+
+	Function::Create(TypeBuilder<void(i<256>*, i<256>*), true>::get(ctx), Linkage::ExternalLinkage, "ext_store", module);
+	Function::Create(TypeBuilder<void(i<256>*, i<256>*), true>::get(ctx), Linkage::ExternalLinkage, "ext_setStore", module);
+}
+
+extern "C"
+{
+
+EXPORT void ext_store(void* _index, void* _value)
+{
+
+}
+
+EXPORT void ext_setStore(void* _index, void* _value)
+{
+
+}
+
+}
+
+}
\ No newline at end of file
diff --git a/evmcc/Ext.h b/evmcc/Ext.h
new file mode 100644
index 0000000000..f1c88d849e
--- /dev/null
+++ b/evmcc/Ext.h
@@ -0,0 +1,22 @@
+
+#include <llvm/IR/IRBuilder.h>
+
+#include <libevm/ExtVMFace.h>
+
+namespace evmcc
+{
+
+
+
+class Ext
+{
+public:
+	Ext(llvm::IRBuilder<>& _builder);
+	static void init(std::unique_ptr<dev::eth::ExtVMFace> _ext);
+
+private:
+	llvm::IRBuilder<>& m_builder;
+};
+	
+
+}
\ No newline at end of file