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/*
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/>.
*/
/** @file ExtVMFace.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <libdevcore/Common.h>
#include <libevmface/Instruction.h>
#include <libethcore/CommonEth.h>
#include <libethcore/BlockInfo.h>
namespace dev
{
namespace eth
{
struct Post
{
Address from;
Address to;
u256 value;
bytes data;
u256 gas;
};
using PostList = std::list<Post>;
using OnOpFunc = std::function<void(uint64_t /*steps*/, Instruction /*instr*/, bigint /*newMemSize*/, bigint /*gasCost*/, void/*VM*/*, void/*ExtVM*/ const*)>;
/**
* @brief A null implementation of the class for specifying VM externalities.
*/
class ExtVMFace
{
public:
/// Null constructor.
ExtVMFace() {}
/// Full constructor.
ExtVMFace(Address _myAddress, Address _caller, Address _origin, u256 _value, u256 _gasPrice, bytesConstRef _data, bytesConstRef _code, BlockInfo const& _previousBlock, BlockInfo const& _currentBlock);
/// Get the code at the given location in code ROM.
byte getCode(u256 _n) const { return _n < code.size() ? code[(unsigned)_n] : 0; }
/// Read storage location.
u256 store(u256) { return 0; }
/// Write a value in storage.
void setStore(u256, u256) {}
/// Read address's balance.
u256 balance(Address) { return 0; }
/// Read address's code.
bytes const& codeAt(Address) { return NullBytes; }
/// Subtract amount from account's balance.
void subBalance(u256) {}
/// Determine account's TX count.
u256 txCount(Address) { return 0; }
/// Suicide the associated contract and give proceeds to the given address.
void suicide(Address) { suicides.insert(myAddress); }
/// Create a new (contract) account.
h160 create(u256, u256*, bytesConstRef, bytesConstRef) { return h160(); }
/// Make a new message call.
bool call(Address, u256, bytesConstRef, u256*, bytesRef, OnOpFunc const&, Address, Address) { return false; }
/// Post a new message call.
void post(Address _to, u256 _value, bytesConstRef _data, u256 _gas) { posts.push_back(Post({myAddress, _to, _value, _data.toBytes(), _gas})); }
/// Revert any changes made (by any of the other calls).
void revert() {}
/// Execute any posts that may exist, including those that are incurred as a result of earlier posts.
void doPosts() {}
Address myAddress; ///< Address associated with executing code (a contract, or contract-to-be).
Address caller; ///< Address which sent the message (either equal to origin or a contract).
Address origin; ///< Original transactor.
u256 value; ///< Value (in Wei) that was passed to this address.
u256 gasPrice; ///< Price of gas (that we already paid).
bytesConstRef data; ///< Current input data.
bytesConstRef code; ///< Current code that is executing.
BlockInfo previousBlock; ///< The previous block's information.
BlockInfo currentBlock; ///< The current block's information.
std::set<Address> suicides; ///< Any accounts that have suicided.
std::list<Post> posts; ///< Any posts that have been made.
};
}
}