solidity/libsolidity/ast/ASTUtils.cpp

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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0
#include <libsolidity/ast/AST.h>
#include <libsolidity/ast/ASTUtils.h>
#include <libsolutil/Algorithms.h>
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namespace solidity::frontend
{
bool isConstantVariableRecursive(VariableDeclaration const& _varDecl)
{
solAssert(_varDecl.isConstant(), "Constant variable expected");
auto visitor = [](VariableDeclaration const& _variable, util::CycleDetector<VariableDeclaration>& _cycleDetector, size_t _depth)
{
solAssert(_depth < 256, "Recursion depth limit reached");
if (!_variable.value())
// This should result in an error later on.
return;
if (auto referencedVarDecl = dynamic_cast<VariableDeclaration const*>(
ASTNode::referencedDeclaration(*_variable.value()))
)
if (referencedVarDecl->isConstant())
_cycleDetector.run(*referencedVarDecl);
};
return util::CycleDetector<VariableDeclaration>(visitor).run(_varDecl) != nullptr;
}
VariableDeclaration const* rootConstVariableDeclaration(VariableDeclaration const& _varDecl)
{
solAssert(_varDecl.isConstant(), "Constant variable expected");
solAssert(!isConstantVariableRecursive(_varDecl), "Recursive declaration");
VariableDeclaration const* rootDecl = &_varDecl;
Identifier const* identifier;
while ((identifier = dynamic_cast<Identifier const*>(rootDecl->value().get())))
{
auto referencedVarDecl = dynamic_cast<VariableDeclaration const*>(identifier->annotation().referencedDeclaration);
if (!referencedVarDecl || !referencedVarDecl->isConstant())
return nullptr;
rootDecl = referencedVarDecl;
}
return rootDecl;
}
}