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104 lines
2.6 KiB
104 lines
2.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file GasMeter.cpp
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* @author Christian <c@ethdev.com>
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* @date 2015
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*/
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#include "GasMeter.h"
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#include <libevmcore/Params.h>
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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GasMeter::GasConsumption& GasMeter::GasConsumption::operator+=(GasConsumption const& _other)
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{
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isInfinite = isInfinite || _other.isInfinite;
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if (isInfinite)
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return *this;
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bigint v = bigint(value) + _other.value;
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if (v > std::numeric_limits<u256>::max())
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isInfinite = true;
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else
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value = u256(v);
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return *this;
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}
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GasMeter::GasConsumption GasMeter::estimateMax(AssemblyItem const& _item)
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{
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switch (_item.type()) {
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case Push:
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case PushTag:
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return runGas(Instruction::PUSH1);
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case Tag:
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return runGas(Instruction::JUMPDEST);
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case Operation:
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{
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GasConsumption gas = runGas(_item.instruction());
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switch (_item.instruction())
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{
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case Instruction::SSTORE:
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// @todo logic can be improved
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gas += c_sstoreSetGas;
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break;
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case Instruction::SLOAD:
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gas += c_sloadGas;
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break;
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case Instruction::MSTORE:
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case Instruction::MSTORE8:
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case Instruction::MLOAD:
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case Instruction::RETURN:
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case Instruction::SHA3:
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case Instruction::CALLDATACOPY:
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case Instruction::CODECOPY:
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case Instruction::EXTCODECOPY:
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case Instruction::LOG0:
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case Instruction::LOG1:
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case Instruction::LOG2:
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case Instruction::LOG3:
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case Instruction::LOG4:
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case Instruction::CALL:
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case Instruction::CALLCODE:
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case Instruction::CREATE:
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case Instruction::EXP:
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// @todo logic can be improved
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gas = GasConsumption::infinite();
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break;
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default:
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break;
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}
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return gas;
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break;
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}
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default:
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break;
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}
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return GasConsumption::infinite();
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}
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GasMeter::GasConsumption GasMeter::runGas(Instruction _instruction)
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{
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if (_instruction == Instruction::JUMPDEST)
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return GasConsumption(1);
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int tier = instructionInfo(_instruction).gasPriceTier;
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return tier == InvalidTier ? GasConsumption::infinite() : c_tierStepGas[tier];
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}
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