cerc-io/solidity
10
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Compute state intersection.

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
KnownState.cpp
View File

@ -160,23 +160,46 @@ KnownState::StoreOperation KnownState::feedItem(AssemblyItem const& _item, bool
return op; 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 for (auto it = _this.begin(); it != _this.end();)
*this = KnownState(m_expressionClasses); 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 bool KnownState::operator==(const KnownState& _other) const
{ {
//@todo return m_storageContent == _other.m_storageContent &&
return ( m_memoryContent == _other.m_memoryContent &&
m_stackElements.empty() && m_stackHeight == _other.m_stackHeight &&
_other.m_stackElements.empty() && m_stackElements == _other.m_stackElements;
m_storageContent.empty() &&
_other.m_storageContent.empty() &&
m_memoryContent.empty() &&
_other.m_memoryContent.empty()
);
} }
ExpressionClasses::Id KnownState::stackElement(int _stackHeight, SourceLocation const& _location) ExpressionClasses::Id KnownState::stackElement(int _stackHeight, SourceLocation const& _location)