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Merge pull request #5325 from ethereum/fixDataFlow

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[Yul] Fix data flow analyzer for function definitions.
This commit is contained in:
chriseth
2018-11-08 12:52:51 +01:00
committed by GitHub
parent b801e61611 b2b11eaa00
commit cd11f7cfac
3 changed files with 117 additions and 0 deletions
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libyul/optimiser/DataFlowAnalyzer.cpp
+13
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@@ -84,13 +84,26 @@ void DataFlowAnalyzer::operator()(Switch& _switch)
void DataFlowAnalyzer::operator()(FunctionDefinition& _fun)
{
// Save all information. We might rather reinstantiate this class,
// but this could be difficult if it is subclassed.
map<YulString, Expression const*> value;
map<YulString, set<YulString>> references;
map<YulString, set<YulString>> referencedBy;
m_value.swap(value);
m_references.swap(references);
m_referencedBy.swap(referencedBy);
pushScope(true);
for (auto const& parameter: _fun.parameters)
m_variableScopes.back().variables.emplace(parameter.name);
for (auto const& var: _fun.returnVariables)
m_variableScopes.back().variables.emplace(var.name);
ASTModifier::operator()(_fun);
popScope();
m_value.swap(value);
m_references.swap(references);
m_referencedBy.swap(referencedBy);
}
void DataFlowAnalyzer::operator()(ForLoop& _for)