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Improved exception safety in CSE.

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Fixes #2135
This commit is contained in:
chriseth 2015-06-10 09:58:59 +02:00
parent 6cc76baeac
commit a72e357c4e
1 changed files with 13 additions and 8 deletions
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21
CommonSubexpressionEliminator.cpp
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@ -35,6 +35,19 @@ vector<AssemblyItem> CommonSubexpressionEliminator::getOptimizedItems()
{
optimizeBreakingItem();
KnownState nextInitialState = m_state;
if (m_breakingItem)
nextInitialState.feedItem(*m_breakingItem);
KnownState nextState = nextInitialState;
ScopeGuard reset([&]()
{
m_breakingItem = nullptr;
m_storeOperations.clear();
m_initialState = move(nextInitialState);
m_state = move(nextState);
});
map<int, Id> initialStackContents;
map<int, Id> targetStackContents;
int minHeight = m_state.stackHeight() + 1;
@ -52,15 +65,7 @@ vector<AssemblyItem> CommonSubexpressionEliminator::getOptimizedItems()
targetStackContents
);
if (m_breakingItem)
{
items.push_back(*m_breakingItem);
m_state.feedItem(*m_breakingItem);
}
// cleanup
m_initialState = m_state;
m_breakingItem = nullptr;
m_storeOperations.clear();
return items;
}