From 2b83b75c4b1885193bb05dcb4ecafe995c69ca35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <pawel.bylica@imapp.pl>
Date: Thu, 18 Dec 2014 14:27:59 +0100
Subject: [PATCH] Object cache wit memory leaks

---
 libevmjit/Cache.cpp           | 23 +++++++++++++++++++++++
 libevmjit/Cache.h             | 22 ++++++++++++++++++++++
 libevmjit/ExecutionEngine.cpp |  3 +++
 3 files changed, 48 insertions(+)

diff --git a/libevmjit/Cache.cpp b/libevmjit/Cache.cpp
index 115322fef3..f9ca473988 100644
--- a/libevmjit/Cache.cpp
+++ b/libevmjit/Cache.cpp
@@ -2,6 +2,7 @@
 #include <unordered_map>
 #include <cassert>
 #include <iostream>
+#include <llvm/IR/Module.h>
 
 namespace dev
 {
@@ -45,6 +46,28 @@ ExecBundle* Cache::findExec(Cache::Key _key)
 	return nullptr;
 }
 
+ObjectCache* Cache::getObjectCache()
+{
+	static ObjectCache objectCache;
+	return &objectCache;
+}
+
+
+void ObjectCache::notifyObjectCompiled(llvm::Module const* _module, llvm::MemoryBuffer const* _object)
+{
+	auto&& key = _module->getModuleIdentifier();
+	auto obj = llvm::MemoryBuffer::getMemBufferCopy(_object->getBuffer());
+	m_map.insert(std::make_pair(key, obj));
+}
+
+llvm::MemoryBuffer* ObjectCache::getObject(llvm::Module const* _module)
+{
+	auto it = m_map.find(_module->getModuleIdentifier());
+	if (it != m_map.end())
+		return llvm::MemoryBuffer::getMemBufferCopy(it->second->getBuffer());
+	return nullptr;
+}
+
 }
 }
 }
diff --git a/libevmjit/Cache.h b/libevmjit/Cache.h
index 42e56f5442..6d15853295 100644
--- a/libevmjit/Cache.h
+++ b/libevmjit/Cache.h
@@ -1,7 +1,9 @@
 #pragma once
 
 #include <memory>
+#include <unordered_map>
 #include <llvm/ExecutionEngine/ExecutionEngine.h>
+#include <llvm/ExecutionEngine/ObjectCache.h>
 
 
 namespace dev
@@ -26,6 +28,24 @@ public:
 	void operator=(ExecBundle) = delete;
 };
 
+
+class ObjectCache : public llvm::ObjectCache
+{
+public:
+	/// notifyObjectCompiled - Provides a pointer to compiled code for Module M.
+	virtual void notifyObjectCompiled(llvm::Module const* _module, llvm::MemoryBuffer const* _object) final override;
+
+	/// getObjectCopy - Returns a pointer to a newly allocated MemoryBuffer that
+	/// contains the object which corresponds with Module M, or 0 if an object is
+	/// not available. The caller owns both the MemoryBuffer returned by this
+	/// and the memory it references.
+	virtual llvm::MemoryBuffer* getObject(llvm::Module const* _module) final override;
+
+private:
+	std::unordered_map<std::string, llvm::MemoryBuffer*> m_map;
+};
+
+
 class Cache
 {
 public:
@@ -33,6 +53,8 @@ public:
 
 	static ExecBundle& registerExec(Key _key, ExecBundle&& _exec);
 	static ExecBundle* findExec(Key _key);
+
+	static ObjectCache* getObjectCache();
 };
 
 }
diff --git a/libevmjit/ExecutionEngine.cpp b/libevmjit/ExecutionEngine.cpp
index 66d840fd5b..162851ae8f 100644
--- a/libevmjit/ExecutionEngine.cpp
+++ b/libevmjit/ExecutionEngine.cpp
@@ -42,6 +42,7 @@ ReturnCode ExecutionEngine::run(bytes const& _code, RuntimeData* _data, Env* _en
 	}*/
 
 	auto module = Compiler({}).compile(_code);
+	//module->dump();
 	return run(std::move(module), _data, _env, _code);
 }
 
@@ -73,6 +74,8 @@ ReturnCode ExecutionEngine::run(std::unique_ptr<llvm::Module> _module, RuntimeDa
 	_module.release();        // Successfully created llvm::ExecutionEngine takes ownership of the module
 	memoryManager.release();  // and memory manager
 
+	exec.engine->setObjectCache(Cache::getObjectCache());
+
 	// TODO: Finalization not needed when llvm::ExecutionEngine::getFunctionAddress used
 	//auto finalizationStartTime = std::chrono::high_resolution_clock::now();
 	//exec.engine->finalizeObject();