public void Begin()
{
RegCount = new RegisterCount();
InRegs = new RegisterMask();
OutRegs = new RegisterMask();
ClobberedRegs = new RegisterMask();
}
public VariableMap(int attrCount)
{
InRegs = new RegisterMask();
OutRegs = new RegisterMask();
ClobberedRegs = new RegisterMask();
Start = new RegisterCount();
Count = new RegisterCount();
AttributesCount = attrCount;
Attributes = new VariableAttributes[attrCount].InitializeWith(() => new VariableAttributes());
}
public void End(CodeNode node)
{
if (VariableCount == 0 && ClobberedRegs.IsEmpty)
{
return;
}
var vaIndex = new RegisterCount();
vaIndex.IndexFrom(RegCount);
var vaMap = new VariableMap(VariableCount);
vaMap.Count.CopyFrom(RegCount);
vaMap.Start.CopyFrom(vaIndex);
vaMap.InRegs.CopyFrom(InRegs);
vaMap.OutRegs.CopyFrom(OutRegs);
vaMap.ClobberedRegs.CopyFrom(ClobberedRegs);
var vi = 0;
while (VariableCount != 0)
{
var va = _tmpList[vi];
var vd = va.VariableData;
var @class = vd.Info.RegisterClass;
var dstIndex = vaIndex.Get(@class);
vaIndex.Add(@class);
if (va.InRegs != 0)
{
va.AllocableRegs = va.InRegs;
}
else if (va.OutRegIndex != RegisterIndex.Invalid)
{
va.AllocableRegs = Utils.Mask(va.OutRegIndex);
}
else
{
va.AllocableRegs &= ~InRegs.Get(@class);
}
vd.Attributes = null;
vaMap.Attributes[dstIndex].CopyFrom(va);
vi++;
VariableCount--;
}
node.VariableMap = vaMap;
return;
}
