ethminer/evmjit/libevmjit/CompilerHelper.h

#pragma once

#include "preprocessor/llvm_includes_start.h"
#include <llvm/IR/IRBuilder.h>
#include "preprocessor/llvm_includes_end.h"


namespace dev
{
namespace eth
{
namespace jit
{
class RuntimeManager;

/// Base class for compiler helpers like Memory, GasMeter, etc.
class CompilerHelper
{
protected:
	CompilerHelper(llvm::IRBuilder<>& _builder);

	CompilerHelper(const CompilerHelper&) = delete;
	CompilerHelper& operator=(CompilerHelper) = delete;

	/// Reference to the IR module being compiled
	llvm::Module* getModule();

	/// Reference to the main module function
	llvm::Function* getMainFunction();

	/// Reference to parent compiler IR builder
	llvm::IRBuilder<>& m_builder;
	llvm::IRBuilder<>& getBuilder() { return m_builder; }

	llvm::CallInst* createCall(llvm::Function* _func, std::initializer_list<llvm::Value*> const& _args);

	friend class RuntimeHelper;
};


/// Compiler helper that depends on runtime data
class RuntimeHelper : public CompilerHelper
{
protected:
	RuntimeHelper(RuntimeManager& _runtimeManager);

	RuntimeManager& getRuntimeManager() { return m_runtimeManager; }

private:
	RuntimeManager& m_runtimeManager;
};


/// Saves the insert point of the IR builder and restores it when destructed
struct InsertPointGuard
{
	InsertPointGuard(llvm::IRBuilder<>& _builder) :
		m_builder(_builder),
		m_insertBB(m_builder.GetInsertBlock()),
		m_insertPt(m_builder.GetInsertPoint())
	{}

	InsertPointGuard(const InsertPointGuard&) = delete;
	void operator=(InsertPointGuard) = delete;

	~InsertPointGuard()
	{
		m_builder.SetInsertPoint(m_insertBB, m_insertPt);
	}

private:
	llvm::IRBuilder<>& m_builder;
	llvm::BasicBlock* m_insertBB;
	llvm::BasicBlock::iterator m_insertPt;
};

}
}
}