/// <summary>
/// Creates the alias to this entry and returnes data which can be used to aliasing the target.
/// </summary>
/// <param name="snapshot">The snapshot.</param>
/// <returns>
/// Alias data fro the newly created aliases.
/// </returns>
public AliasData CreateAliasToEntry(Snapshot snapshot)
{
//Collect alias indexes
AssignCollector indexesCollector = new AssignCollector(snapshot);
indexesCollector.ProcessPath(path);
//Memory locations where to get data from
ReadCollector valueCollector = new ReadCollector(snapshot);
valueCollector.ProcessPath(path);
//Get data from locations
ReadWorker worker = new ReadWorker(snapshot);
MemoryEntry value = worker.ReadValue(valueCollector);
//Makes deep copy of data to prevent changes after assign alias
TemporaryIndex temporaryIndex = snapshot.CreateTemporary();
MergeWithinSnapshotWorker mergeWorker = new MergeWithinSnapshotWorker(snapshot);
mergeWorker.MergeMemoryEntry(temporaryIndex, value);
AliasData data = new AliasData(indexesCollector.MustIndexes, indexesCollector.MayIndexes, temporaryIndex);
data.TemporaryIndexToRealease(temporaryIndex);
return(data);
}
/// <summary>
/// Assigns the specified collector.
/// </summary>
/// <param name="collector">The collector.</param>
/// <param name="sourceIndex">Index of the source.</param>
internal void Assign(IIndexCollector collector, MemoryIndex sourceIndex)
{
foreach (MemoryIndex mustIndex in collector.MustIndexes)
{
snapshot.DestroyMemory(mustIndex);
CopyWithinSnapshotWorker copyWorker = new CopyWithinSnapshotWorker(snapshot, true);
copyWorker.Copy(sourceIndex, mustIndex);
}
foreach (MemoryIndex mayIndex in collector.MayIndexes)
{
MergeWithinSnapshotWorker mergeWorker = new MergeWithinSnapshotWorker(snapshot);
mergeWorker.MergeIndexes(mayIndex, sourceIndex);
}
MemoryEntry entry = snapshot.Structure.GetMemoryEntry(sourceIndex);
LocationVisitor mustVisitor = new LocationVisitor(snapshot, entry, true);
foreach (ValueLocation location in collector.MustLocation)
{
location.Accept(mustVisitor);
}
LocationVisitor mayVisitor = new LocationVisitor(snapshot, entry, false);
foreach (ValueLocation location in collector.MayLocaton)
{
location.Accept(mayVisitor);
}
}
/// <summary>
/// Gets the snapshot entry of temporary index associated with this memory entry.
/// </summary>
/// <param name="context">The context.</param>
private SnapshotEntry getTemporary(SnapshotBase context)
{
Snapshot snapshot = SnapshotEntry.ToSnapshot(context);
if (temporaryLocation == null)
{
temporaryIndex = snapshot.CreateTemporary();
MergeWithinSnapshotWorker mergeWorker = new MergeWithinSnapshotWorker(snapshot);
mergeWorker.MergeMemoryEntry(temporaryIndex, dataEntry);
temporaryLocation = new SnapshotEntry(MemoryPath.MakePathTemporary(temporaryIndex));
}
return(temporaryLocation);
}
/// <summary>
/// Writes the memory normal.
/// </summary>
/// <param name="snapshot">The snapshot.</param>
/// <param name="value">The value.</param>
/// <param name="forceStrongWrite">if set to <c>true</c> [force strong write].</param>
private void writeMemoryNormal(Snapshot snapshot, MemoryEntry value, bool forceStrongWrite)
{
TemporaryIndex temporaryIndex = snapshot.CreateTemporary();
MergeWithinSnapshotWorker mergeWorker = new MergeWithinSnapshotWorker(snapshot);
mergeWorker.MergeMemoryEntry(temporaryIndex, value);
AssignCollector collector = new AssignCollector(snapshot);
collector.ProcessPath(path);
if (forceStrongWrite)
{
collector.SetAllToMust();
}
AssignWorker worker = new AssignWorker(snapshot);
worker.Assign(collector, temporaryIndex);
snapshot.ReleaseTemporary(temporaryIndex);
}