/// <summary>
/// Prepares operation for every descendant index of target array.
/// </summary>
/// <param name="operation">The operation.</param>
/// <returns>Array where the input arrays is merged into.</returns>
private void mergeArrays(MergeOperation operation)
{
AssociativeArray targetArray = Structure.Readonly.GetArray(operation.TargetIndex);
IArrayDescriptor targetDescriptor = Structure.Readonly.GetDescriptor(targetArray);
ContainerOperations collectIndexes = new ContainerOperations(this, targetDescriptor, operation.TargetIndex, targetDescriptor.UnknownIndex);
foreach (var operationData in operation.Indexes)
{
MemoryIndex index = operationData.Item1;
Snapshot snapshot = operationData.Item2;
AssociativeArray arrayValue;
if (snapshot.Structure.Readonly.TryGetArray(index, out arrayValue))
{
IArrayDescriptor descriptor = snapshot.Structure.Readonly.GetDescriptor(arrayValue);
collectIndexes.AddContainer(descriptor, snapshot);
}
else
{
collectIndexes.SetUndefined();
}
}
collectIndexes.MergeContainers();
}
/// <summary>
/// Creates the merge operation for all fields of specified object.
/// </summary>
/// <param name="objectValue">The object value.</param>
private void mergeObject(ObjectValue objectValue)
{
IObjectDescriptorBuilder builder =
Factories.StructuralContainersFactories.ObjectDescriptorFactory.CreateObjectDescriptor(writeableStrucure, objectValue, null, ObjectIndex.CreateUnknown(objectValue))
.Builder(writeableStrucure);
ContainerOperations collectVariables = new ContainerOperations(this, builder, builder.UnknownIndex, builder.UnknownIndex);
foreach (Snapshot snapshot in sourceSnapshots)
{
IObjectDescriptor descriptor;
if (snapshot.Structure.Readonly.TryGetDescriptor(objectValue, out descriptor))
{
collectVariables.CollectIndexes(snapshot, builder.UnknownIndex, descriptor);
builder.SetType(descriptor.Type);
}
else
{
collectVariables.SetUndefined();
}
}
collectVariables.MergeContainers();
writeableStrucure.SetDescriptor(objectValue, builder.Build(writeableStrucure));
}
/// <summary>
/// Prepares operation for every descendant index and merge the array into one which will be
/// stored in the target memory entry.
/// </summary>
/// <param name="operation">The operation.</param>
/// <returns>Array where the input arrays is merged into.</returns>
private Value mergeArrays(MergeOperation operation)
{
var structure = writeableStrucure;
IArrayDescriptorBuilder builder = Factories.StructuralContainersFactories.ArrayDescriptorFactory.CreateArrayDescriptor(writeableStrucure, null, operation.TargetIndex).Builder(structure);
builder.SetUnknownIndex(operation.TargetIndex.CreateUnknownIndex());
ContainerOperations collectVariables = new ContainerOperations(this, builder, operation.TargetIndex, builder.UnknownIndex);
// Collecting possible indexes of merged array
AssociativeArray targetArray = null;
foreach (var operationData in operation.Indexes)
{
MemoryIndex index = operationData.Item1;
Snapshot snapshot = operationData.Item2;
AssociativeArray arrayValue;
if (snapshot.Structure.Readonly.TryGetArray(index, out arrayValue))
{
// Target array value will be the firs one
if (targetArray == null)
{
if (index.Equals(operation.TargetIndex))
{
targetArray = arrayValue;
}
}
IArrayDescriptor descriptor = snapshot.Structure.Readonly.GetDescriptor(arrayValue);
collectVariables.CollectIndexes(snapshot, index, descriptor);
}
else
{
collectVariables.SetUndefined();
}
}
if (targetArray == null)
{
targetArray = targetSnapshot.CreateArray();
}
builder.SetArrayValue(targetArray);
collectVariables.MergeContainers();
structure.SetArray(operation.TargetIndex, targetArray);
structure.SetDescriptor(targetArray, builder.Build(structure));
return(targetArray);
}
/// <summary>
/// Main method of merge algorithm.
///
/// iI first phase prepares new empty data collection. Then collects all root memory locations and
/// prepares their operations. As the final step process all merge operations which traverses the
/// memory tree and merges data from all source indexes.
/// </summary>
internal void Merge()
{
ContainerOperations[] collectVariables = new ContainerOperations[targetCallLevel + 1];
ContainerOperations[] collectControl = new ContainerOperations[targetCallLevel + 1];
MergeOperation returnOperation = new MergeOperation();
for (int x = 0; x <= targetCallLevel; x++)
{
IReadonlyIndexContainer variables = Structure.Readonly.GetReadonlyStackContext(x).ReadonlyVariables;
collectVariables[x] = new ContainerOperations(this, variables, variables.UnknownIndex, variables.UnknownIndex);
IReadonlyIndexContainer control = Structure.Readonly.GetReadonlyStackContext(x).ReadonlyControllVariables;
collectControl[x] = new ContainerOperations(this, control, control.UnknownIndex, control.UnknownIndex);
}
foreach (Snapshot snapshot in sourceSnapshots)
{
for (int sourceLevel = 0, targetLevel = 0; targetLevel <= targetCallLevel; sourceLevel++, targetLevel++)
{
if (sourceLevel == snapshot.CallLevel && snapshot.CallLevel != targetCallLevel)
{
if (isCallMerge)
{
break;
}
else
{
targetLevel = targetCallLevel;
}
}
IReadonlyIndexContainer variables = snapshot.Structure.Readonly.GetReadonlyStackContext(sourceLevel).ReadonlyVariables;
collectVariables[targetLevel].AddContainer(variables, snapshot);
IReadonlyIndexContainer control = snapshot.Structure.Readonly.GetReadonlyStackContext(sourceLevel).ReadonlyControllVariables;
collectControl[targetLevel].AddContainer(control, snapshot);
}
}
mergeObjects();
for (int x = 0; x <= targetCallLevel; x++)
{
collectVariables[x].MergeContainers();
collectControl[x].MergeContainers();
mergeTemporary(x);
}
processMerge();
}
/// <summary>
/// Creates the merge operation for all fields of specified object.
/// </summary>
/// <param name="objectValue">The object value.</param>
private void mergeObject(ObjectValue objectValue)
{
IObjectDescriptor targetDescriptor = Structure.Readonly.GetDescriptor(objectValue);
ContainerOperations collectVariables = new ContainerOperations(this, targetDescriptor, targetDescriptor.UnknownIndex, targetDescriptor.UnknownIndex);
foreach (Snapshot snapshot in sourceSnapshots)
{
IObjectDescriptor descriptor;
if (snapshot.Structure.Readonly.TryGetDescriptor(objectValue, out descriptor))
{
collectVariables.AddContainer(descriptor, snapshot);
}
else
{
collectVariables.SetUndefined();
}
}
collectVariables.MergeContainers();
}
/// <summary>
/// Main method of merge algorithm.
///
/// in first phase prepares new empty structure and data collections. Then collects all root memory locations
/// and prepares their operations. As the final step process all merge operations which traverses the memory tree
/// and creates new memory locations in target structure with the data from all source indexes.
/// </summary>
internal void Merge()
{
ContainerOperations[] collectVariables = new ContainerOperations[targetSnapshotCallLevel + 1];
ContainerOperations[] collectControl = new ContainerOperations[targetSnapshotCallLevel + 1];
MergeOperation returnOperation = new MergeOperation();
// Prepares empty structure for target snapshot
for (int x = 0; x <= targetSnapshotCallLevel; x++)
{
writeableStrucure.AddLocalLevel();
IWriteableIndexContainer variables = writeableStrucure.GetWriteableStackContext(x).WriteableVariables;
collectVariables[x] = new ContainerOperations(this, variables, variables.UnknownIndex, variables.UnknownIndex);
IWriteableIndexContainer control = writeableStrucure.GetWriteableStackContext(x).WriteableControllVariables;
collectControl[x] = new ContainerOperations(this, control, control.UnknownIndex, control.UnknownIndex);
}
// Collects all objects and root locations from the source objects
foreach (Snapshot snapshot in sourceSnapshots)
{
collectObjects(snapshot);
for (int sourceLevel = 0, targetLevel = 0; targetLevel <= targetSnapshotCallLevel; sourceLevel++, targetLevel++)
{
// Local levels of snaphot has to be merged together no matter to call level of each snapshot.
if (sourceLevel == snapshot.CallLevel && snapshot.CallLevel != targetSnapshotCallLevel)
{
if (isCallMerge)
{
// When this is the call merge the local level is forgotten
break;
}
else
{
targetLevel = targetSnapshotCallLevel;
}
}
// Gets all root locations
IWriteableIndexContainer targetVariables = writeableStrucure.GetWriteableStackContext(targetLevel).WriteableVariables;
IReadonlyIndexContainer sourceVariables = snapshot.Structure.Readonly.GetReadonlyStackContext(sourceLevel).ReadonlyVariables;
collectVariables[targetLevel].CollectIndexes(snapshot, targetVariables.UnknownIndex, sourceVariables);
IWriteableIndexContainer targetControlls = writeableStrucure.GetWriteableStackContext(targetLevel).WriteableControllVariables;
IReadonlyIndexContainer sourceControlls = snapshot.Structure.Readonly.GetReadonlyStackContext(sourceLevel).ReadonlyControllVariables;
collectControl[targetLevel].CollectIndexes(snapshot, targetControlls.UnknownIndex, sourceControlls);
collectTemporary(snapshot, sourceLevel, targetLevel);
}
foreach (var name in snapshot.Structure.Readonly.GetFunctions())
{
foreach (var decl in snapshot.Structure.Readonly.GetFunction(name))
{
writeableStrucure.AddFunctiondeclaration(name, decl);
}
}
foreach (var name in snapshot.Structure.Readonly.GetClasses())
{
foreach (var decl in snapshot.Structure.Readonly.GetClass(name))
{
writeableStrucure.AddClassDeclaration(name, decl);
}
}
// When is it call merge remember which arrays was forgotten in order to support arrays in returns
if (isCallMerge)
{
foreach (AssociativeArray array in snapshot.Structure.Readonly.ReadonlyLocalContext.ReadonlyArrays)
{
writeableStrucure.AddCallArray(array, snapshot);
}
}
}
mergeObjects();
// Prepares operations for all root locations
for (int x = 0; x <= targetSnapshotCallLevel; x++)
{
collectVariables[x].MergeContainers();
collectControl[x].MergeContainers();
mergeTemporary(x);
}
processMerge();
// Build aliases
foreach (var alias in memoryAliases)
{
writeableStrucure.SetAlias(alias.Key, alias.Value.Build(writeableStrucure));
}
}