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using System;
using System.Collections.Generic;
namespace ARMeilleure.IntermediateRepresentation
{
class Node
{
public Operand Destination
{
get
{
return _destinations.Length != 0 ? GetDestination(0) : null;
}
set
{
if (value != null)
{
SetDestinations(new Operand[] { value });
}
else
{
SetDestinations(new Operand[0]);
}
}
}
private Operand[] _destinations;
private Operand[] _sources;
private LinkedListNode<Node>[] _asgUseNodes;
private LinkedListNode<Node>[] _srcUseNodes;
public int DestinationsCount => _destinations.Length;
public int SourcesCount => _sources.Length;
public Node(Operand destination, int sourcesCount)
{
Destination = destination;
_sources = new Operand[sourcesCount];
_srcUseNodes = new LinkedListNode<Node>[sourcesCount];
}
public Node(Operand[] destinations, int sourcesCount)
{
SetDestinations(destinations ?? throw new ArgumentNullException(nameof(destinations)));
_sources = new Operand[sourcesCount];
_srcUseNodes = new LinkedListNode<Node>[sourcesCount];
}
public Operand GetDestination(int index)
{
return _destinations[index];
}
public Operand GetSource(int index)
{
return _sources[index];
}
public void SetDestination(int index, Operand destination)
{
Operand oldOp = _destinations[index];
if (oldOp != null && oldOp.Kind == OperandKind.LocalVariable)
{
oldOp.Assignments.Remove(_asgUseNodes[index]);
}
if (destination != null && destination.Kind == OperandKind.LocalVariable)
{
_asgUseNodes[index] = destination.Assignments.AddLast(this);
}
_destinations[index] = destination;
}
public void SetSource(int index, Operand source)
{
Operand oldOp = _sources[index];
if (oldOp != null && oldOp.Kind == OperandKind.LocalVariable)
{
oldOp.Uses.Remove(_srcUseNodes[index]);
}
if (source != null && source.Kind == OperandKind.LocalVariable)
{
_srcUseNodes[index] = source.Uses.AddLast(this);
}
_sources[index] = source;
}
public void SetDestinations(Operand[] destinations)
{
if (_destinations != null)
{
for (int index = 0; index < _destinations.Length; index++)
{
Operand oldOp = _destinations[index];
if (oldOp != null && oldOp.Kind == OperandKind.LocalVariable)
{
oldOp.Assignments.Remove(_asgUseNodes[index]);
}
}
_destinations = destinations;
}
else
{
_destinations = new Operand[destinations.Length];
}
_asgUseNodes = new LinkedListNode<Node>[destinations.Length];
for (int index = 0; index < destinations.Length; index++)
{
Operand newOp = destinations[index];
_destinations[index] = newOp;
if (newOp.Kind == OperandKind.LocalVariable)
{
_asgUseNodes[index] = newOp.Assignments.AddLast(this);
}
}
}
public void SetSources(Operand[] sources)
{
for (int index = 0; index < _sources.Length; index++)
{
Operand oldOp = _sources[index];
if (oldOp != null && oldOp.Kind == OperandKind.LocalVariable)
{
oldOp.Uses.Remove(_srcUseNodes[index]);
}
}
_sources = new Operand[sources.Length];
_srcUseNodes = new LinkedListNode<Node>[sources.Length];
for (int index = 0; index < sources.Length; index++)
{
Operand newOp = sources[index];
_sources[index] = newOp;
if (newOp.Kind == OperandKind.LocalVariable)
{
_srcUseNodes[index] = newOp.Uses.AddLast(this);
}
}
}
}
}
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