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Refactor termination detection.

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This commit is contained in:
chriseth
2019-05-13 18:58:36 +02:00
parent 1d75770700
commit 99e96c2d66
6 changed files with 89 additions and 54 deletions
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libyul/optimiser/Semantics.cpp
+38
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@@ -72,3 +72,41 @@ void MovableChecker::visit(Statement const&)
{
assertThrow(false, OptimizerException, "Movability for statement requested.");
}
pair<TerminationFinder::ControlFlow, size_t> TerminationFinder::firstUnconditionalControlFlowChange(
vector<Statement> const& _statements
)
{
for (size_t i = 0; i < _statements.size(); ++i)
{
ControlFlow controlFlow = controlFlowKind(_statements[i]);
if (controlFlow != ControlFlow::FlowOut)
return {controlFlow, i};
}
return {ControlFlow::FlowOut, size_t(-1)};
}
TerminationFinder::ControlFlow TerminationFinder::controlFlowKind(Statement const& _statement)
{
if (
_statement.type() == typeid(ExpressionStatement) &&
isTerminatingBuiltin(boost::get<ExpressionStatement>(_statement))
)
return ControlFlow::Terminate;
else if (_statement.type() == typeid(Break))
return ControlFlow::Break;
else if (_statement.type() == typeid(Continue))
return ControlFlow::Continue;
else
return ControlFlow::FlowOut;
}
bool TerminationFinder::isTerminatingBuiltin(ExpressionStatement const& _exprStmnt)
{
if (_exprStmnt.expression.type() != typeid(FunctionalInstruction))
return false;
return eth::SemanticInformation::terminatesControlFlow(
boost::get<FunctionalInstruction>(_exprStmnt.expression).instruction
);
}