mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
122 lines
3.2 KiB
C++
122 lines
3.2 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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/**
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* Specific AST walkers that collect semantical facts.
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*/
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#include <libyul/optimiser/Semantics.h>
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#include <libyul/Exceptions.h>
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#include <libyul/AsmData.h>
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#include <libyul/Dialect.h>
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#include <libevmasm/SemanticInformation.h>
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#include <libdevcore/CommonData.h>
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using namespace std;
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using namespace dev;
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using namespace yul;
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MovableChecker::MovableChecker(Dialect const& _dialect):
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m_dialect(_dialect)
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{
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}
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MovableChecker::MovableChecker(Dialect const& _dialect, Expression const& _expression):
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MovableChecker(_dialect)
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{
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visit(_expression);
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}
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void MovableChecker::operator()(Identifier const& _identifier)
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{
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ASTWalker::operator()(_identifier);
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m_variableReferences.emplace(_identifier.name);
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}
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void MovableChecker::operator()(FunctionalInstruction const& _instr)
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{
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ASTWalker::operator()(_instr);
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if (!eth::SemanticInformation::movable(_instr.instruction))
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m_movable = false;
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if (!eth::SemanticInformation::sideEffectFree(_instr.instruction))
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m_sideEffectFree = false;
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}
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void MovableChecker::operator()(FunctionCall const& _functionCall)
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{
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ASTWalker::operator()(_functionCall);
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if (BuiltinFunction const* f = m_dialect.builtin(_functionCall.functionName.name))
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{
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if (!f->movable)
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m_movable = false;
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if (!f->sideEffectFree)
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m_sideEffectFree = false;
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}
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else
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{
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m_movable = false;
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m_sideEffectFree = false;
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}
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}
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void MovableChecker::visit(Statement const&)
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{
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assertThrow(false, OptimizerException, "Movability for statement requested.");
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}
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pair<TerminationFinder::ControlFlow, size_t> TerminationFinder::firstUnconditionalControlFlowChange(
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vector<Statement> const& _statements
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)
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{
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for (size_t i = 0; i < _statements.size(); ++i)
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{
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ControlFlow controlFlow = controlFlowKind(_statements[i]);
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if (controlFlow != ControlFlow::FlowOut)
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return {controlFlow, i};
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}
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return {ControlFlow::FlowOut, size_t(-1)};
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}
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TerminationFinder::ControlFlow TerminationFinder::controlFlowKind(Statement const& _statement)
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{
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if (
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_statement.type() == typeid(ExpressionStatement) &&
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isTerminatingBuiltin(boost::get<ExpressionStatement>(_statement))
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)
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return ControlFlow::Terminate;
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else if (_statement.type() == typeid(Break))
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return ControlFlow::Break;
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else if (_statement.type() == typeid(Continue))
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return ControlFlow::Continue;
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else
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return ControlFlow::FlowOut;
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}
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bool TerminationFinder::isTerminatingBuiltin(ExpressionStatement const& _exprStmnt)
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{
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if (_exprStmnt.expression.type() != typeid(FunctionalInstruction))
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return false;
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return eth::SemanticInformation::terminatesControlFlow(
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boost::get<FunctionalInstruction>(_exprStmnt.expression).instruction
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);
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}
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