/// <summary>
/// Generates a mask to best represent parts of the signature to be compared
/// </summary>
public static ulong GetMask(ref DFunctionSignature signature)
{
var value = signature.Value;
ulong mask = 0;
//ulong argTypeMask = TypeMask; //(int)ValueTypes.Any;
//while ((value & mask) != value)
//{
// if ((value & argTypeMask) != 0)
// mask |= argTypeMask;
// argTypeMask <<= BitsPerType;
//}
var argOffset = 0;
while (value != 0)
{
var argType = value & TypeMask;
if (argType != 0)
{
///TODO: we used to have the following code so that higher types can capture lowe types. (e.g. Object captures also Array). However
///this causes problem in the code cache and we should make sure we don't add repetitive code to it.
//if (argType == (ulong)ValueTypes.Object)
// mask |= ((ulong)ValueTypes.Object << argOffset);
//else
mask |= ((ulong)TypeMask << argOffset);
}
argOffset += BitsPerType;
value >>= BitsPerType;
}
return(mask);
}
/// <summary>
/// Generates a mask to best represent parts of the signature to be compared
/// </summary>
public static ulong GetMask(ref DFunctionSignature signature)
{
var value = signature.Value;
ulong mask = 0;
//ulong argTypeMask = TypeMask; //(int)ValueTypes.Any;
//while ((value & mask) != value)
//{
// if ((value & argTypeMask) != 0)
// mask |= argTypeMask;
// argTypeMask <<= BitsPerType;
//}
var argOffset = 0;
while (value != 0)
{
var argType = value & TypeMask;
if (argType != 0)
///TODO: we used to have the following code so that higher types can capture lowe types. (e.g. Object captures also Array). However
///this causes problem in the code cache and we should make sure we don't add repetitive code to it.
//if (argType == (ulong)ValueTypes.Object)
// mask |= ((ulong)ValueTypes.Object << argOffset);
//else
mask |= ((ulong)TypeMask << argOffset);
argOffset += BitsPerType;
value >>= BitsPerType;
}
return mask;
}
static DFunctionSignature()
{
EmptySignature = new DFunctionSignature();
EmptySignature.Value = 0; //Set all unused bits to ValueTypes.Undefined
Debug.Assert((int)ValueTypes.Undefined == 0x0, "Invalid value assigned to Undefined value type");
//EmptySignature.Value = ulong.MaxValue; //Set all unused bits to ValueTypes.Unknown
//Debug.Assert((int)ValueTypes.Unknown == 0xF, "Invalid value assigned to Unknown value type");
}
static DFunctionSignature()
{
EmptySignature = new DFunctionSignature();
EmptySignature.Value = 0; //Set all unused bits to ValueTypes.Undefined
Debug.Assert((int)ValueTypes.Undefined == 0x0, "Invalid value assigned to Undefined value type");
//EmptySignature.Value = ulong.MaxValue; //Set all unused bits to ValueTypes.Unknown
//Debug.Assert((int)ValueTypes.Unknown == 0xF, "Invalid value assigned to Unknown value type");
}
public T Get(ref DFunctionSignature signature)
{
for (int i = _items.Count - 1; i >= 0; --i)
{
var funcCode = _items[i].Code;
if (funcCode.MatchSignature(ref signature))
{
//TODO: optimizations such as: update count, bring to front, etc.
return(funcCode);
}
}
return(null);
}
public DFunctionCode(ref DFunctionSignature signature)
{
SignatureMask.Value = DFunctionSignature.GetMask(ref signature);
Signature.Value = SignatureMask.Value & signature.Value;
}
public bool MatchSignature(ref DFunctionSignature signature)
{
return((signature.Value & SignatureMask.Value) == Signature.Value);
}
public DFunctionCode(ref DFunctionSignature signature)
{
SignatureMask.Value = DFunctionSignature.GetMask(ref signature);
Signature.Value = SignatureMask.Value & signature.Value;
}
public bool MatchSignature(ref DFunctionSignature signature)
{
return (signature.Value & SignatureMask.Value) == Signature.Value;
}