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/*
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/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2016
* Full-stack Solidity inline assember.
*/
#pragma once
#include <libsolidity/interface/Exceptions.h>
#include <string>
#include <functional>
namespace dev
{
namespace eth
{
class Assembly;
}
namespace solidity
{
class Scanner;
namespace assembly
{
struct Block;
struct Identifier;
enum class IdentifierContext { LValue, RValue };
/// Object that is used to resolve references and generate code for access to identifiers external
/// to inline assembly (not used in standalone assembly mode).
struct ExternalIdentifierAccess
{
using Resolver = std::function<size_t(assembly::Identifier const&, IdentifierContext)>;
/// Resolve a an external reference given by the identifier in the given context.
/// @returns the size of the value (number of stack slots) or size_t(-1) if not found.
Resolver resolve;
using CodeGenerator = std::function<void(assembly::Identifier const&, IdentifierContext, eth::Assembly&)>;
/// Generate code for retrieving the value (rvalue context) or storing the value (lvalue context)
/// of an identifier. The code should be appended to the assembly. In rvalue context, the value is supposed
/// to be put onto the stack, in lvalue context, the value is assumed to be at the top of the stack.
CodeGenerator generateCode;
};
class InlineAssemblyStack
{
public:
/// Parse the given inline assembly chunk starting with `{` and ending with the corresponding `}`.
/// @return false or error.
bool parse(
std::shared_ptr<Scanner> const& _scanner,
ExternalIdentifierAccess::Resolver const& _externalIdentifierResolver = ExternalIdentifierAccess::Resolver()
);
/// Converts the parser result back into a string form (not necessarily the same form
/// as the source form, but it should parse into the same parsed form again).
std::string toString();
eth::Assembly assemble();
/// Parse and assemble a string in one run - for use in Solidity code generation itself.
bool parseAndAssemble(
std::string const& _input,
eth::Assembly& _assembly,
ExternalIdentifierAccess const& _identifierAccess = ExternalIdentifierAccess()
);
ErrorList const& errors() const { return m_errors; }
private:
std::shared_ptr<Block> m_parserResult;
ErrorList m_errors;
};
}
}
}
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