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Compute state intersection.

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This commit is contained in:
chriseth 2015-05-11 16:40:28 +02:00
parent 2fbcb5b9c8
commit 2870281fe8
1 changed files with 35 additions and 12 deletions
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47
KnownState.cpp
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@ -160,23 +160,46 @@ KnownState::StoreOperation KnownState::feedItem(AssemblyItem const& _item, bool
return op;
}
void KnownState::reduceToCommonKnowledge(KnownState const& /*_other*/)
/// Helper function for KnownState::reduceToCommonKnowledge, removes everything from
/// _this which is not in or not equal to the value in _other.
template <class _Mapping, class _KeyType = ExpressionClasses::Id> void intersect(
_Mapping& _this,
_Mapping const& _other,
function<_KeyType(_KeyType)> const& _keyTrans = [](_KeyType _k) { return _k; }
)
{
//@todo
*this = KnownState(m_expressionClasses);
for (auto it = _this.begin(); it != _this.end();)
if (_other.count(_keyTrans(it->first)) && _other.at(_keyTrans(it->first)) == it->second)
++it;
else
it = _this.erase(it);
}
void KnownState::reduceToCommonKnowledge(KnownState const& _other)
{
int stackDiff = m_stackHeight - _other.m_stackHeight;
function<int(int)> stackKeyTransform = [=](int _key) -> int { return _key - stackDiff; };
intersect(m_stackElements, _other.m_stackElements, stackKeyTransform);
// Use the smaller stack height. Essential to terminate in case of loops.
if (m_stackHeight > _other.m_stackHeight)
{
map<int, Id> shiftedStack;
for (auto const& stackElement: m_stackElements)
shiftedStack[stackElement.first - stackDiff] = stackElement.second;
m_stackElements = move(shiftedStack);
m_stackHeight = _other.m_stackHeight;
}
intersect(m_storageContent, _other.m_storageContent);
intersect(m_memoryContent, _other.m_memoryContent);
}
bool KnownState::operator==(const KnownState& _other) const
{
//@todo
return (
m_stackElements.empty() &&
_other.m_stackElements.empty() &&
m_storageContent.empty() &&
_other.m_storageContent.empty() &&
m_memoryContent.empty() &&
_other.m_memoryContent.empty()
);
return m_storageContent == _other.m_storageContent &&
m_memoryContent == _other.m_memoryContent &&
m_stackHeight == _other.m_stackHeight &&
m_stackElements == _other.m_stackElements;
}
ExpressionClasses::Id KnownState::stackElement(int _stackHeight, SourceLocation const& _location)