mirror of
https://github.com/ethereum/solidity
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011f8d3ff7
Since the gas calculation can involve multiplication by ``--optimize-runs``, it is possible that `size_t` is not enough to represent the total gas.
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/*
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This file is part of solidity.
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solidity 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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solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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/**
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* Module providing metrics for the EVM optimizer.
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*/
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#include <libyul/backends/evm/EVMMetrics.h>
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#include <libyul/AST.h>
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#include <libyul/Exceptions.h>
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#include <libyul/Utilities.h>
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#include <libyul/backends/evm/EVMDialect.h>
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#include <libevmasm/Instruction.h>
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#include <libevmasm/GasMeter.h>
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#include <libsolutil/Visitor.h>
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#include <libsolutil/CommonData.h>
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using namespace std;
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using namespace solidity;
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using namespace solidity::yul;
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using namespace solidity::util;
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bigint GasMeter::costs(Expression const& _expression) const
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{
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return combineCosts(GasMeterVisitor::costs(_expression, m_dialect, m_isCreation));
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}
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bigint GasMeter::instructionCosts(evmasm::Instruction _instruction) const
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{
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return combineCosts(GasMeterVisitor::instructionCosts(_instruction, m_dialect, m_isCreation));
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}
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bigint GasMeter::combineCosts(std::pair<bigint, bigint> _costs) const
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{
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return _costs.first * m_runs + _costs.second;
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}
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pair<bigint, bigint> GasMeterVisitor::costs(
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Expression const& _expression,
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EVMDialect const& _dialect,
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bool _isCreation
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)
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{
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GasMeterVisitor gmv(_dialect, _isCreation);
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gmv.visit(_expression);
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return {gmv.m_runGas, gmv.m_dataGas};
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}
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pair<bigint, bigint> GasMeterVisitor::instructionCosts(
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evmasm::Instruction _instruction,
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EVMDialect const& _dialect,
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bool _isCreation
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)
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{
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GasMeterVisitor gmv(_dialect, _isCreation);
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gmv.instructionCostsInternal(_instruction);
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return {gmv.m_runGas, gmv.m_dataGas};
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}
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void GasMeterVisitor::operator()(FunctionCall const& _funCall)
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{
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ASTWalker::operator()(_funCall);
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if (BuiltinFunctionForEVM const* f = m_dialect.builtin(_funCall.functionName.name))
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if (f->instruction)
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{
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instructionCostsInternal(*f->instruction);
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return;
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}
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yulAssert(false, "Functions not implemented.");
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}
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void GasMeterVisitor::operator()(Literal const& _lit)
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{
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m_runGas += evmasm::GasMeter::runGas(evmasm::Instruction::PUSH1);
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m_dataGas +=
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singleByteDataGas() +
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evmasm::GasMeter::dataGas(
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toCompactBigEndian(valueOfLiteral(_lit), 1),
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m_isCreation,
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m_dialect.evmVersion()
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);
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}
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void GasMeterVisitor::operator()(Identifier const&)
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{
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m_runGas += evmasm::GasMeter::runGas(evmasm::Instruction::DUP1);
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m_dataGas += singleByteDataGas();
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}
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bigint GasMeterVisitor::singleByteDataGas() const
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{
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if (m_isCreation)
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return evmasm::GasCosts::txDataNonZeroGas(m_dialect.evmVersion());
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else
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return evmasm::GasCosts::createDataGas;
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}
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void GasMeterVisitor::instructionCostsInternal(evmasm::Instruction _instruction)
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{
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if (_instruction == evmasm::Instruction::EXP)
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m_runGas += evmasm::GasCosts::expGas + evmasm::GasCosts::expByteGas(m_dialect.evmVersion());
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else if (_instruction == evmasm::Instruction::KECCAK256)
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// Assumes that Keccak-256 is computed on a single word (rounded up).
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m_runGas += evmasm::GasCosts::keccak256Gas + evmasm::GasCosts::keccak256WordGas;
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else
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m_runGas += evmasm::GasMeter::runGas(_instruction);
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m_dataGas += singleByteDataGas();
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}
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