/*
	This file is part of cpp-ethereum.

	cpp-ethereum 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.

	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @author Christian <c@ethdev.com>
 * @date 2016
 * Parsed inline assembly to be used by the AST
 */

#pragma once

#include <boost/variant.hpp>
#include <libevmasm/Instruction.h>

namespace dev
{
namespace solidity
{
namespace assembly
{

/// What follows are the AST nodes for assembly.

/// Direct EVM instruction (except PUSHi and JUMPDEST)
struct Instruction { eth::Instruction instruction; };
/// Literal number or string (up to 32 bytes)
struct Literal { bool isNumber; std::string value; };
/// External / internal identifier or label reference
struct Identifier { std::string name; };
struct FunctionalInstruction;
/// Jump label ("name:")
struct Label { std::string name; };
/// Assignemnt (":= x", moves stack top into x, potentially multiple slots)
struct Assignment { Identifier variableName; };
struct FunctionalAssignment;
struct VariableDeclaration;
struct Block;
using Statement = boost::variant<Instruction, Literal, Label, Assignment, Identifier, FunctionalAssignment, FunctionalInstruction, VariableDeclaration, Block>;
/// Functional assignment ("x := mload(20)", expects push-1-expression on the right hand
/// side and requires x to occupy exactly one stack slot.
struct FunctionalAssignment { Identifier variableName; std::shared_ptr<Statement> value; };
/// Functional instruction, e.g. "mul(mload(20), add(2, x))"
struct FunctionalInstruction { Instruction instruction; std::vector<Statement> arguments; };
/// Block-scope variable declaration ("let x := mload(20)"), non-hoisted
struct VariableDeclaration { std::string name; std::shared_ptr<Statement> value; };
/// Block that creates a scope (frees declared stack variables)
struct Block { std::vector<Statement> statements; };

}
}
}