mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
ef6ff2f055
Deprecates `block.difficulty` and disallow `difficulty()` in inline assembly for EVM versions >= paris. The change is due to the renaming introduced by EIP-4399 (see: https://eips.ethereum.org/EIPS/eip-4399). Introduces `block.prevrandao` in Solidity and `prevrandao()` in inline assembly for EVM versions >= paris. Co-authored-by: Alex Beregszaszi <alex@rtfs.hu> Co-authored-by: Daniel <daniel@ekpyron.org> Co-authored-by: matheusaaguiar <95899911+matheusaaguiar@users.noreply.github.com> Co-authored-by: Nikola Matić <nikola.matic@ethereum.org>
82 lines
2.4 KiB
C++
82 lines
2.4 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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* Some useful snippets for the optimiser.
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*/
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#include <libyul/optimiser/OptimizerUtilities.h>
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#include <libyul/backends/evm/EVMDialect.h>
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#include <libyul/Dialect.h>
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#include <libyul/AST.h>
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#include <liblangutil/Token.h>
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#include <libsolutil/CommonData.h>
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#include <range/v3/action/remove_if.hpp>
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using namespace std;
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using namespace solidity;
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using namespace solidity::langutil;
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using namespace solidity::util;
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using namespace solidity::yul;
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void yul::removeEmptyBlocks(Block& _block)
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{
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auto isEmptyBlock = [](Statement const& _st) -> bool {
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return holds_alternative<Block>(_st) && std::get<Block>(_st).statements.empty();
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};
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ranges::actions::remove_if(_block.statements, isEmptyBlock);
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}
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bool yul::isRestrictedIdentifier(Dialect const& _dialect, YulString const& _identifier)
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{
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return _identifier.empty() || TokenTraits::isYulKeyword(_identifier.str()) || _dialect.reservedIdentifier(_identifier);
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}
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optional<evmasm::Instruction> yul::toEVMInstruction(Dialect const& _dialect, YulString const& _name)
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{
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if (auto const* dialect = dynamic_cast<EVMDialect const*>(&_dialect))
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if (BuiltinFunctionForEVM const* builtin = dialect->builtin(_name))
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return builtin->instruction;
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return nullopt;
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}
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langutil::EVMVersion const yul::evmVersionFromDialect(Dialect const& _dialect)
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{
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if (auto const* dialect = dynamic_cast<EVMDialect const*>(&_dialect))
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return dialect->evmVersion();
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return langutil::EVMVersion();
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}
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void StatementRemover::operator()(Block& _block)
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{
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util::iterateReplacing(
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_block.statements,
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[&](Statement& _statement) -> std::optional<vector<Statement>>
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{
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if (m_toRemove.count(&_statement))
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return {vector<Statement>{}};
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else
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return nullopt;
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}
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);
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ASTModifier::operator()(_block);
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}
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