solidity/libyul/optimiser/Semantics.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/>.
*/
/**
* Specific AST walkers that collect semantical facts.
*/
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#include <libyul/optimiser/Semantics.h>
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#include <libyul/Exceptions.h>
#include <libyul/AsmData.h>
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#include <libyul/Dialect.h>
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#include <libevmasm/SemanticInformation.h>
#include <libdevcore/CommonData.h>
using namespace std;
using namespace dev;
using namespace yul;
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MovableChecker::MovableChecker(Dialect const& _dialect):
m_dialect(_dialect)
{
}
MovableChecker::MovableChecker(Dialect const& _dialect, Expression const& _expression):
MovableChecker(_dialect)
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{
visit(_expression);
}
void MovableChecker::operator()(Identifier const& _identifier)
{
ASTWalker::operator()(_identifier);
m_variableReferences.emplace(_identifier.name);
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}
void MovableChecker::operator()(FunctionalInstruction const& _instr)
{
if (!eth::SemanticInformation::movable(_instr.instruction))
m_movable = false;
else
ASTWalker::operator()(_instr);
}
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void MovableChecker::operator()(FunctionCall const& _functionCall)
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{
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if (BuiltinFunction const* f = m_dialect.builtin(_functionCall.functionName.name))
if (f->movable)
{
ASTWalker::operator()(_functionCall);
return;
}
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m_movable = false;
}
void MovableChecker::visit(Statement const&)
{
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assertThrow(false, OptimizerException, "Movability for statement requested.");
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}