private int GuessSpill(RegisterClass @class, VariableData vd, int allocableRegs)
{
if (allocableRegs == 0)
{
throw new ArgumentException();
}
return(0);
}
public void Setup(VariableData vd, VariableFlags flags = 0, int inRegs = 0, int allocableRegs = 0)
{
VariableData = vd;
Flags = flags;
UsageCount = 0;
InRegIndex = RegisterIndex.Invalid;
OutRegIndex = RegisterIndex.Invalid;
InRegs = inRegs;
AllocableRegs = allocableRegs;
}
public void RegisterContextVariable(VariableData vd)
{
if (vd.LocalId != Constants.InvalidId)
{
return;
}
vd.LocalId = ContextVd.Count;
ContextVd.Add(vd);
}
public VariableAttributes Add(VariableData vd, VariableFlags flags, int newAllocable)
{
var va = _tmpList[VariableCount++];
va.Setup(vd, flags, 0, newAllocable);
va.UsageCount += 1;
vd.Attributes = va;
RegisterContextVariable(vd);
RegCount.Add(vd.Info.RegisterClass);
return(va);
}
public VariableAttributes FindAttributesByClass(RegisterClass @class, VariableData vd)
{
var list = GetListByClass(@class);
var count = Count.Get(@class);
for (var i = 0; i < count; i++)
{
if (list[i].VariableData == vd)
{
return(list[i]);
}
}
return(null);
}
public VariableAttributes FindAttributes(VariableData vd)
{
var list = Attributes;
var count = AttributesCount;
for (var i = 0; i < count; i++)
{
if (list[i].VariableData == vd)
{
return(list[i]);
}
}
return(null);
}
private void InsertCallArgument(CallNode call, VariableData sVd, FunctionInOut arg, int argIndex, ref SArgData[] sArgList, ref int sArgCount)
{
int i;
var aType = arg.VariableType;
var sType = sVd.Type;
// First locate or create sArgBase.
for (i = 0; i < sArgCount; i++)
{
if (sArgList[i].Svd == sVd && sArgList[i].Cvd == null)
{
break;
}
}
var sArgData = sArgList[i];
if (i == sArgCount)
{
sArgData.Svd = sVd;
sArgData.Cvd = null;
sArgData.Arg = null;
sArgData.Type = VariableType.Invalid;
sArgCount++;
}
var sInfo = sType.GetVariableInfo();
var sClass = sInfo.RegisterClass;
if (SArgData.MustConvertSArg(aType, sType))
{
var cType = SArgData.TypeOfConvertedSArg(aType, sType);
var cInfo = cType.GetVariableInfo();
var cClass = cInfo.RegisterClass;
while (++i < sArgCount)
{
sArgData = sArgList[i];
if (sArgData.Svd != sVd)
{
break;
}
if (sArgData.Cvd.Type != cType || sArgData.Type != aType)
{
continue;
}
sArgData.Arg.AffectedArguments |= Utils.Mask(argIndex);
return;
}
var cVd = _compiler.CreateVariableData(cType, cInfo, null);
var sArg = new CallArgumentNode(call, sVd, cVd);
var map = new VariableMap(2);
_variableContext.RegisterContextVariable(cVd);
_variableContext.RegisterContextVariable(sVd);
map.Count.Add(sClass);
map.Count.Add(cClass);
if (sClass <= cClass)
{
map.Attributes[0].Setup(sVd, VariableFlags.RReg, 0, _variableContext.GaRegs[sClass]);
map.Attributes[1].Setup(cVd, VariableFlags.WReg, 0, _variableContext.GaRegs[cClass]);
map.Start.Set(cClass, (sClass != cClass).AsInt());
}
else
{
map.Attributes[0].Setup(cVd, VariableFlags.WReg, 0, _variableContext.GaRegs[cClass]);
map.Attributes[1].Setup(sVd, VariableFlags.RReg, 0, _variableContext.GaRegs[sClass]);
map.Start.Set(sClass, 1);
}
sArg.VariableMap = map;
sArg.AffectedArguments |= Utils.Mask(argIndex);
_compiler.AddNodeBefore(sArg, call);
//::memmove(sArgData + 1, sArgData, (sArgCount - i) * sizeof(SArgData));
var tmp = new SArgData[sArgCount + 1];
Array.Copy(sArgList, 0, tmp, 0, i);
Array.Copy(sArgList, i + 1, tmp, i + 1, sArgCount - i);
sArgList = tmp;
sArgData.Svd = sVd;
sArgData.Cvd = cVd;
sArgData.Arg = sArg;
sArgData.Type = aType;
sArgCount++;
}
else
{
var sArg = sArgData.Arg;
_variableContext.RegisterContextVariable(sVd);
if (sArg == null)
{
sArg = new CallArgumentNode(call, sVd, null);
var map = new VariableMap(1);
map.Count.Add(sClass);
map.Attributes[0].Setup(sVd, VariableFlags.RReg, 0, _variableContext.GaRegs[sClass]);
sArg.VariableMap = map;
sArgData.Arg = sArg;
_compiler.AddNodeBefore(sArg, call);
}
sArg.AffectedArguments |= Utils.Mask(argIndex);
}
}
private int GuessAlloc(RegisterClass @class, VariableData vd, int allocableRegs)
{
if (allocableRegs == 0)
{
throw new ArgumentException();
}
if (allocableRegs.IsPowerOf2())
{
return(allocableRegs);
}
var safeRegs = allocableRegs;
var node = Node;
for (var j = 0; j < Assembler.MaxLookAhead; j++)
{
if (node.Flags.IsSet(CodeNodeFlags.Ret) || node.Flags.IsSet(CodeNodeFlags.Jcc))
{
break;
}
if (node.Flags.IsSet(CodeNodeFlags.Jmp))
{
node = node.As <JumpNode>().Target;
if (node == null)
{
break;
}
}
node = node.Next;
if (node == null)
{
throw new ArgumentException();
}
var map = node.VariableMap;
if (map == null)
{
continue;
}
var va = map.FindAttributesByClass(@class, vd);
if (va != null)
{
var inRegs = va.InRegs;
if (inRegs != 0)
{
safeRegs = allocableRegs;
allocableRegs &= inRegs;
return(allocableRegs == 0 ? safeRegs : allocableRegs);
}
}
safeRegs = allocableRegs;
allocableRegs &= ~(map.InRegs.Get(@class) | map.OutRegs.Get(@class) | map.ClobberedRegs.Get(@class));
if (allocableRegs == 0)
{
break;
}
}
return(safeRegs);
}
private int GuessAlloc(VariableData vd, int allocableRegs, RegisterClass @class)
{
if (!(allocableRegs != 0))
{
throw new ArgumentException();
}
if (allocableRegs.IsPowerOf2())
{
return(allocableRegs);
}
var safeRegs = allocableRegs;
var localId = vd.LocalId;
var node = Node;
for (var i = 0; i < Assembler.MaxLookAhead; i++)
{
var liveness = node.Liveness;
// If the variable becomes dead it doesn't make sense to continue.
if (liveness != null && liveness.GetBit(localId) == 0)
{
break;
}
// Stop on `HLSentinel` and `HLRet`.
if (node.Flags.IsSet(CodeNodeFlags.Ret))
{
break;
}
// Stop on conditional jump, we don't follow them.
if (node.Flags.IsSet(CodeNodeFlags.Jcc))
{
break;
}
// Advance on non-conditional jump.
if (node.Flags.IsSet(CodeNodeFlags.Jmp))
{
node = node.As <JumpNode>().Target;
// Stop on jump that is not followed.
if (node == null)
{
break;
}
}
node = node.Next;
if (node == null)
{
throw new ArgumentException();
}
var map = node.VariableMap;
if (map == null)
{
continue;
}
var va = map.FindAttributesByClass(@class, vd);
if (va != null)
{
// If the variable is overwritten it doesn't mase sense to continue.
if ((va.Flags & VariableFlags.RAll) == 0)
{
break;
}
var mask = va.AllocableRegs;
if (mask != 0)
{
allocableRegs &= mask;
if (allocableRegs == 0)
{
break;
}
safeRegs = allocableRegs;
}
mask = va.InRegs;
if (mask != 0)
{
allocableRegs &= mask;
if (allocableRegs == 0)
{
break;
}
safeRegs = allocableRegs;
break;
}
allocableRegs &= ~(map.OutRegs.Get(@class) | map.ClobberedRegs.Get(@class));
if (allocableRegs == 0)
{
break;
}
}
else
{
allocableRegs &= ~(map.InRegs.Get(@class) | map.OutRegs.Get(@class) | map.ClobberedRegs.Get(@class));
if (allocableRegs == 0)
{
break;
}
}
safeRegs = allocableRegs;
}
return(safeRegs);
}