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Fix recursion protection.

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This commit is contained in:
chriseth 2021-08-19 12:14:50 +02:00
parent 4b038e3f02
commit 8926274000
2 changed files with 10 additions and 10 deletions
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17
libyul/optimiser/KnowledgeBase.cpp
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@ -88,22 +88,21 @@ optional<u256> KnowledgeBase::valueIfKnownConstant(YulString _a)
Expression KnowledgeBase::simplify(Expression _expression)
{
bool startedRecursion = (m_recursionCounter == 0);
ScopeGuard{[&] { if (startedRecursion) m_recursionCounter = 0; }};
m_counter = 0;
return simplifyRecursively(move(_expression));
}
if (startedRecursion)
m_recursionCounter = 100;
else if (m_recursionCounter == 1)
Expression KnowledgeBase::simplifyRecursively(Expression _expression)
{
if (m_counter++ > 100)
return _expression;
else
--m_recursionCounter;
if (holds_alternative<FunctionCall>(_expression))
for (Expression& arg: std::get<FunctionCall>(_expression).arguments)
arg = simplify(arg);
arg = simplifyRecursively(arg);
if (auto match = SimplificationRules::findFirstMatch(_expression, m_dialect, m_variableValues))
return simplify(match->action().toExpression(debugDataOf(_expression)));
return simplifyRecursively(match->action().toExpression(debugDataOf(_expression)));
return _expression;
}

3
libyul/optimiser/KnowledgeBase.h
View File

@ -56,10 +56,11 @@ public:
private:
Expression simplify(Expression _expression);
Expression simplifyRecursively(Expression _expression);
Dialect const& m_dialect;
std::map<YulString, AssignedValue> const& m_variableValues;
size_t m_recursionCounter = 0;
size_t m_counter = 0;
};
}