mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
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.
104 lines
2.9 KiB
C++
104 lines
2.9 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 optimizer.
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*/
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#pragma once
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#include <libyul/optimiser/ASTWalker.h>
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#include <liblangutil/EVMVersion.h>
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#include <libevmasm/Instruction.h>
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namespace solidity::yul
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{
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struct EVMDialect;
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/**
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* Gas meter for expressions only involving literals, identifiers and
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* EVM instructions.
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*
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* Assumes that EXP is not used with exponents larger than a single byte.
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* Is not particularly exact for anything apart from arithmetic.
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*
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* Assumes that Keccak-256 is computed on a single word (rounded up).
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*/
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class GasMeter
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{
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public:
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GasMeter(EVMDialect const& _dialect, bool _isCreation, bigint _runs):
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m_dialect(_dialect),
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m_isCreation{_isCreation},
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m_runs(_isCreation? 1 : _runs)
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{}
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/// @returns the full combined costs of deploying and evaluating the expression.
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bigint costs(Expression const& _expression) const;
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/// @returns the combined costs of deploying and running the instruction, not including
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/// the costs for its arguments.
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bigint instructionCosts(evmasm::Instruction _instruction) const;
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private:
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bigint combineCosts(std::pair<bigint, bigint> _costs) const;
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EVMDialect const& m_dialect;
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bool m_isCreation = false;
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bigint m_runs;
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};
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class GasMeterVisitor: public ASTWalker
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{
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public:
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static std::pair<bigint, bigint> 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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static std::pair<bigint, bigint> instructionCosts(
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evmasm::Instruction _instruction,
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EVMDialect const& _dialect,
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bool _isCreation = false
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);
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public:
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GasMeterVisitor(EVMDialect const& _dialect, bool _isCreation):
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m_dialect(_dialect),
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m_isCreation{_isCreation}
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{}
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void operator()(FunctionCall const& _funCall) override;
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void operator()(Literal const& _literal) override;
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void operator()(Identifier const& _identifier) override;
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private:
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bigint singleByteDataGas() const;
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/// Computes the cost of storing and executing the single instruction (excluding its arguments).
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/// For EXP, it assumes that the exponent is at most 255.
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/// Does not work particularly exact for anything apart from arithmetic.
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void instructionCostsInternal(evmasm::Instruction _instruction);
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EVMDialect const& m_dialect;
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bool m_isCreation = false;
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bigint m_runGas = 0;
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bigint m_dataGas = 0;
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};
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}
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