private static void StoreMethodLocalValue(
ValueBasicBlockPair[] valueCollection,
ValueNode valueToStore,
int index,
int curBasicBlock)
{
ValueBasicBlockPair newValue = new ValueBasicBlockPair {
BasicBlockIndex = curBasicBlock
};
ValueBasicBlockPair existingValue = valueCollection[index];
if (existingValue.Value != null &&
existingValue.BasicBlockIndex == curBasicBlock)
{
// If the previous value was stored in the current basic block, then we can safely
// overwrite the previous value with the new one.
newValue.Value = valueToStore;
}
else
{
// If the previous value came from a previous basic block, then some other use of
// the local could see the previous value, so we must merge the new value with the
// old value.
newValue.Value = MergePointValue.MergeValues(existingValue.Value, valueToStore);
}
valueCollection[index] = newValue;
}
private static StackSlot MergeStackElement(StackSlot a, StackSlot b)
{
StackSlot mergedSlot;
if (b.Value == null)
{
mergedSlot = a;
}
else if (a.Value == null)
{
mergedSlot = b;
}
else
{
mergedSlot = new StackSlot(MergePointValue.MergeValues(a.Value, b.Value));
}
return(mergedSlot);
}
private static void StoreMethodLocalValue <KeyType>(
Dictionary <KeyType, ValueBasicBlockPair> valueCollection,
ValueNode valueToStore,
KeyType collectionKey,
int curBasicBlock,
int?maxTrackedValues = null)
{
ValueBasicBlockPair newValue = new ValueBasicBlockPair {
BasicBlockIndex = curBasicBlock
};
ValueBasicBlockPair existingValue;
if (valueCollection.TryGetValue(collectionKey, out existingValue))
{
if (existingValue.BasicBlockIndex == curBasicBlock)
{
// If the previous value was stored in the current basic block, then we can safely
// overwrite the previous value with the new one.
newValue.Value = valueToStore;
}
else
{
// If the previous value came from a previous basic block, then some other use of
// the local could see the previous value, so we must merge the new value with the
// old value.
newValue.Value = MergePointValue.MergeValues(existingValue.Value, valueToStore);
}
valueCollection[collectionKey] = newValue;
}
else if (maxTrackedValues == null || valueCollection.Count < maxTrackedValues)
{
// We're not currently tracking a value a this index, so store the value now.
newValue.Value = valueToStore;
valueCollection[collectionKey] = newValue;
}
}
