Use code hash as main function name

libevmjit/Cache.h

@@ -18,10 +18,12 @@ class ExecBundle
 {
 public:
 	std::unique_ptr<llvm::ExecutionEngine> engine;
+	std::string mainFuncName;
 
 	ExecBundle() = default;
 	ExecBundle(ExecBundle&& _other):
-		engine(std::move(_other.engine))
+		engine(std::move(_other.engine)),
+		mainFuncName(std::move(_other.mainFuncName))
 	{}
 
 	ExecBundle(ExecBundle const&) = delete;

libevmjit/Compiler.cpp

@@ -164,7 +164,7 @@ std::unique_ptr<llvm::Module> Compiler::compile(bytes const& _bytecode)
 
 	// Create main function
 	auto mainFuncType = llvm::FunctionType::get(Type::MainReturn, Type::RuntimePtr, false);
-	m_mainFunc = llvm::Function::Create(mainFuncType, llvm::Function::ExternalLinkage, "main", module.get());
+	m_mainFunc = llvm::Function::Create(mainFuncType, llvm::Function::ExternalLinkage, strHash, module.get());
 	m_mainFunc->getArgumentList().front().setName("rt");
 
 	// Create the basic blocks.

libevmjit/CompilerHelper.cpp

@@ -2,6 +2,7 @@
 #include "CompilerHelper.h"
 
 #include <llvm/IR/Function.h>
+#include <llvm/IR/Module.h>
 
 #include "RuntimeManager.h"
 
@@ -25,10 +26,11 @@ llvm::Module* CompilerHelper::getModule()
 
 llvm::Function* CompilerHelper::getMainFunction()
 {
+	// TODO: Rename or change semantics of getMainFunction() function
 	assert(m_builder.GetInsertBlock());
 	auto mainFunc = m_builder.GetInsertBlock()->getParent();
 	assert(mainFunc);
-	if (mainFunc->getName() == "main")
+	if (mainFunc == &mainFunc->getParent()->getFunctionList().front())  // Main function is the first one in module
 		return mainFunc;
 	return nullptr;
 }

libevmjit/ExecutionEngine.cpp

@@ -68,6 +68,7 @@ ReturnCode ExecutionEngine::run(std::unique_ptr<llvm::Module> _module, RuntimeDa
 	_module->setTargetTriple(triple.str());
 
 	ExecBundle exec;
+	exec.mainFuncName = _module->getModuleIdentifier();
 	exec.engine.reset(builder.create());
 	if (!exec.engine)
 		return ReturnCode::LLVMConfigError;
@@ -110,7 +111,7 @@ ReturnCode runEntryFunc(ExecBundle const& _exec, Runtime* _runtime)
 	// to allow function to be executed.
 	// That might be related to memory manager. Can we share one?
 	typedef ReturnCode(*EntryFuncPtr)(Runtime*);
-	auto entryFuncPtr = (EntryFuncPtr)_exec.engine->getFunctionAddress("main");
+	auto entryFuncPtr = (EntryFuncPtr)_exec.engine->getFunctionAddress(_exec.mainFuncName);
 
 	ReturnCode returnCode{};
 	auto sj = setjmp(_runtime->getJmpBuf());