/*
	This file is part of solidity.

	solidity is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	solidity is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * Adaptor between the abstract assembly and eth assembly.
 */

#pragma once

#include <libyul/backends/evm/AbstractAssembly.h>
#include <libyul/AsmAnalysis.h>
#include <liblangutil/SourceLocation.h>
#include <functional>

namespace dev
{
namespace eth
{
class Assembly;
class AssemblyItem;
}
}

namespace yul
{
struct Block;

class EthAssemblyAdapter: public AbstractAssembly
{
public:
	explicit EthAssemblyAdapter(dev::eth::Assembly& _assembly);
	void setSourceLocation(langutil::SourceLocation const& _location) override;
	int stackHeight() const override;
	void setStackHeight(int height) override;
	void appendInstruction(dev::eth::Instruction _instruction) override;
	void appendConstant(dev::u256 const& _constant) override;
	void appendLabel(LabelID _labelId) override;
	void appendLabelReference(LabelID _labelId) override;
	size_t newLabelId() override;
	size_t namedLabel(std::string const& _name) override;
	void appendLinkerSymbol(std::string const& _linkerSymbol) override;
	void appendJump(int _stackDiffAfter) override;
	void appendJumpTo(LabelID _labelId, int _stackDiffAfter) override;
	void appendJumpToIf(LabelID _labelId) override;
	void appendBeginsub(LabelID, int) override;
	void appendJumpsub(LabelID, int, int) override;
	void appendReturnsub(int, int) override;
	void appendAssemblySize() override;
	std::pair<std::shared_ptr<AbstractAssembly>, SubID> createSubAssembly() override;
	void appendDataOffset(SubID _sub) override;
	void appendDataSize(SubID _sub) override;
	SubID appendData(dev::bytes const& _data) override;

private:
	static LabelID assemblyTagToIdentifier(dev::eth::AssemblyItem const& _tag);

	dev::eth::Assembly& m_assembly;
	std::map<SubID, dev::u256> m_dataHashBySubId;
	size_t m_nextDataCounter = std::numeric_limits<size_t>::max() / 2;
};

class CodeGenerator
{
public:
	/// Performs code generation and appends generated to _assembly.
	static void assemble(
		Block const& _parsedData,
		AsmAnalysisInfo& _analysisInfo,
		dev::eth::Assembly& _assembly,
		langutil::EVMVersion _evmVersion,
		ExternalIdentifierAccess const& _identifierAccess = ExternalIdentifierAccess(),
		bool _useNamedLabelsForFunctions = false,
		bool _optimizeStackAllocation = false
	);
};

}