mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
71 lines
2.5 KiB
C++
71 lines
2.5 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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#include <libsolidity/ast/AST.h>
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#include <libsolidity/ast/ASTUtils.h>
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#include <libsolutil/Algorithms.h>
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namespace solidity::frontend
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{
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bool isConstantVariableRecursive(VariableDeclaration const& _varDecl)
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{
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solAssert(_varDecl.isConstant(), "Constant variable expected");
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auto referencedDeclaration = [&](Expression const* _e) -> VariableDeclaration const*
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{
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if (auto identifier = dynamic_cast<Identifier const*>(_e))
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return dynamic_cast<VariableDeclaration const*>(identifier->annotation().referencedDeclaration);
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else if (auto memberAccess = dynamic_cast<MemberAccess const*>(_e))
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return dynamic_cast<VariableDeclaration const*>(memberAccess->annotation().referencedDeclaration);
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return nullptr;
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};
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auto visitor = [&](VariableDeclaration const& _variable, util::CycleDetector<VariableDeclaration>& _cycleDetector, size_t _depth)
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{
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solAssert(_depth < 256, "Recursion depth limit reached");
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if (auto referencedVarDecl = referencedDeclaration(_variable.value().get()))
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if (referencedVarDecl->isConstant())
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if (_cycleDetector.run(*referencedVarDecl))
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return;
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};
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return util::CycleDetector<VariableDeclaration>(visitor).run(_varDecl);
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}
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VariableDeclaration const* rootConstVariableDeclaration(VariableDeclaration const& _varDecl)
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{
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solAssert(_varDecl.isConstant(), "Constant variable expected");
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solAssert(!isConstantVariableRecursive(_varDecl), "Recursive declaration");
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VariableDeclaration const* rootDecl = &_varDecl;
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Identifier const* identifier;
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while ((identifier = dynamic_cast<Identifier const*>(rootDecl->value().get())))
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{
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auto referencedVarDecl = dynamic_cast<VariableDeclaration const*>(identifier->annotation().referencedDeclaration);
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if (!referencedVarDecl || !referencedVarDecl->isConstant())
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return nullptr;
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rootDecl = referencedVarDecl;
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}
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return rootDecl;
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}
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}
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