private static int CompareNativeVarInfo(NativeVarInfo left, NativeVarInfo right)
{
if (left.VariableNumber < right.VariableNumber)
{
return(-1);
}
else if (left.VariableNumber > right.VariableNumber)
{
return(1);
}
else if (left.StartOffset < right.StartOffset)
{
return(-1);
}
else if (left.StartOffset > right.StartOffset)
{
return(1);
}
else
{
return(0);
}
}
private void ParseNativeVarInfo(byte[] image, int offset)
{
// Each Varinfo has a:
// - native start +End offset. We can use a delta for the end offset.
// - Il variable number. These are usually small.
// - VarLoc information. This is a tagged variant.
// The entries aren't sorted in any particular order.
NibbleReader reader = new NibbleReader(image, offset);
uint nativeVarCount = reader.ReadUInt();
for (int i = 0; i < nativeVarCount; ++i)
{
var entry = new NativeVarInfo();
entry.StartOffset = reader.ReadUInt();
entry.EndOffset = entry.StartOffset + reader.ReadUInt();
entry.VariableNumber = (uint)(reader.ReadUInt() + (int)ImplicitILArguments.Max);
var varLoc = new VarLoc();
varLoc.VarLocType = (VarLocType)reader.ReadUInt();
switch (varLoc.VarLocType)
{
case VarLocType.VLT_REG:
case VarLocType.VLT_REG_FP:
case VarLocType.VLT_REG_BYREF:
varLoc.Data1 = (int)reader.ReadUInt();
break;
case VarLocType.VLT_STK:
case VarLocType.VLT_STK_BYREF:
varLoc.Data1 = (int)reader.ReadUInt();
varLoc.Data2 = ReadEncodedStackOffset(reader);
break;
case VarLocType.VLT_REG_REG:
varLoc.Data1 = (int)reader.ReadUInt();
varLoc.Data2 = (int)reader.ReadUInt();
break;
case VarLocType.VLT_REG_STK:
varLoc.Data1 = (int)reader.ReadUInt();
varLoc.Data2 = (int)reader.ReadUInt();
varLoc.Data3 = ReadEncodedStackOffset(reader);
break;
case VarLocType.VLT_STK_REG:
varLoc.Data1 = ReadEncodedStackOffset(reader);
varLoc.Data2 = (int)reader.ReadUInt();
varLoc.Data3 = (int)reader.ReadUInt();
break;
case VarLocType.VLT_STK2:
varLoc.Data1 = (int)reader.ReadUInt();
varLoc.Data2 = ReadEncodedStackOffset(reader);
break;
case VarLocType.VLT_FPSTK:
varLoc.Data1 = (int)reader.ReadUInt();
break;
case VarLocType.VLT_FIXED_VA:
varLoc.Data1 = (int)reader.ReadUInt();
break;
default:
throw new BadImageFormatException("Unexpected var loc type");
}
entry.VariableLocation = varLoc;
_variablesList.Add(entry);
}
if (_normalize)
{
_variablesList.Sort(CompareNativeVarInfo);
}
}
