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using System;
namespace ARMeilleure.IntermediateRepresentation
{
class Node : IIntrusiveListNode<Node>
{
public Node ListPrevious { get; set; }
public Node ListNext { get; set; }
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;
public int DestinationsCount => _destinations.Length;
public int SourcesCount => _sources.Length;
public Node(Operand destination, int sourcesCount)
{
Destination = destination;
_sources = new Operand[sourcesCount];
}
public Node(Operand[] destinations, int sourcesCount)
{
SetDestinations(destinations ?? throw new ArgumentNullException(nameof(destinations)));
_sources = new Operand[sourcesCount];
}
public Operand GetDestination(int index)
{
return _destinations[index];
}
public Operand GetSource(int index)
{
return _sources[index];
}
public void SetDestination(int index, Operand destination)
{
RemoveAssignment(_destinations[index]);
AddAssignment(destination);
_destinations[index] = destination;
}
public void SetSource(int index, Operand source)
{
RemoveUse(_sources[index]);
AddUse(source);
_sources[index] = source;
}
public void SetDestinations(Operand[] destinations)
{
if (_destinations != null)
{
for (int index = 0; index < _destinations.Length; index++)
{
RemoveAssignment(_destinations[index]);
}
_destinations = destinations;
}
else
{
_destinations = new Operand[destinations.Length];
}
for (int index = 0; index < destinations.Length; index++)
{
Operand newOp = destinations[index];
_destinations[index] = newOp;
AddAssignment(newOp);
}
}
public void SetSources(Operand[] sources)
{
for (int index = 0; index < _sources.Length; index++)
{
RemoveUse(_sources[index]);
}
_sources = new Operand[sources.Length];
for (int index = 0; index < sources.Length; index++)
{
Operand newOp = sources[index];
_sources[index] = newOp;
AddUse(newOp);
}
}
private void AddAssignment(Operand op)
{
if (op == null)
{
return;
}
if (op.Kind == OperandKind.LocalVariable)
{
op.Assignments.Add(this);
}
else if (op.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)op;
if (memOp.BaseAddress != null)
{
memOp.BaseAddress.Assignments.Add(this);
}
if (memOp.Index != null)
{
memOp.Index.Assignments.Add(this);
}
}
}
private void RemoveAssignment(Operand op)
{
if (op == null)
{
return;
}
if (op.Kind == OperandKind.LocalVariable)
{
op.Assignments.Remove(this);
}
else if (op.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)op;
if (memOp.BaseAddress != null)
{
memOp.BaseAddress.Assignments.Remove(this);
}
if (memOp.Index != null)
{
memOp.Index.Assignments.Remove(this);
}
}
}
private void AddUse(Operand op)
{
if (op == null)
{
return;
}
if (op.Kind == OperandKind.LocalVariable)
{
op.Uses.Add(this);
}
else if (op.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)op;
if (memOp.BaseAddress != null)
{
memOp.BaseAddress.Uses.Add(this);
}
if (memOp.Index != null)
{
memOp.Index.Uses.Add(this);
}
}
}
private void RemoveUse(Operand op)
{
if (op == null)
{
return;
}
if (op.Kind == OperandKind.LocalVariable)
{
op.Uses.Remove(this);
}
else if (op.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)op;
if (memOp.BaseAddress != null)
{
memOp.BaseAddress.Uses.Remove(this);
}
if (memOp.Index != null)
{
memOp.Index.Uses.Remove(this);
}
}
}
}
}
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