public DesktopInstanceField()

in ClrMemDiag/Desktop/fields.cs [463:594]
100 lines of code
43 McCabe index (conditional complexity)

        public DesktopInstanceField(DesktopGCHeap heap, IFieldData data, string name, FieldAttributes attributes, IntPtr sig, int sigLen)
        {
            _name = name;
            _field = data;
            _attributes = attributes;

            ulong mt = data.TypeMethodTable;
            if (mt != 0)
                _type = (BaseDesktopHeapType)heap.GetTypeByMethodTable(mt, 0);

            if (_type == null)
            {
                if (sig != IntPtr.Zero && sigLen > 0)
                {
                    SigParser sigParser = new SigParser(sig, sigLen);

                    bool res;
                    int sigType, etype = 0;

                    if (res = sigParser.GetCallingConvInfo(out sigType))
                        Debug.Assert(sigType == SigParser.IMAGE_CEE_CS_CALLCONV_FIELD);

                    res = res && sigParser.SkipCustomModifiers();
                    res = res && sigParser.GetElemType(out etype);


                    // Generic instantiation
                    if (etype == 0x15)
                        res = res && sigParser.GetElemType(out etype);

                    if (res)
                    {
                        ClrElementType type = (ClrElementType)etype;

                        if (type == ClrElementType.Array)
                        {
                            res = sigParser.PeekElemType(out etype);
                            res = res && sigParser.SkipExactlyOne();

                            int ranks = 0;
                            res = res && sigParser.GetData(out ranks);

                            if (res)
                                _type = heap.GetArrayType((ClrElementType)etype, ranks, null);
                        }
                        else if (type == ClrElementType.SZArray)
                        {
                            res = sigParser.PeekElemType(out etype);
                            type = (ClrElementType)etype;

                            if (DesktopRuntimeBase.IsObjectReference(type))
                                _type = (BaseDesktopHeapType)heap.GetBasicType(ClrElementType.SZArray);
                            else
                                _type = (BaseDesktopHeapType)heap.GetArrayType(type, -1, null);
                        }
                        else if (type == ClrElementType.Pointer)
                        {
                            // Only deal with single pointers for now and types that have already been constructed
                            res = sigParser.GetElemType(out etype);
                            type = (ClrElementType)etype;

                            int token;
                            sigParser.GetToken(out token);
                            BaseDesktopHeapType innerType = (BaseDesktopHeapType)heap.GetTypeByToken(heap.DesktopRuntime.GetModule(data.Module), Convert.ToUInt32(token));

                            if (innerType == null)
                            {
                                innerType = (BaseDesktopHeapType)heap.GetBasicType(type);
                            }

                            _type = heap.CreatePointerType(innerType, type, null);
                        }
                        else
                        {
                            // If it's a class or struct, then try to get the token
                            int token = 0;
                            if (etype == 0x11 || etype == 0x12)
                                res = res && sigParser.GetToken(out token);

                            if (token != 0)
                                _type = (BaseDesktopHeapType)heap.GetTypeByToken(heap.DesktopRuntime.GetModule(data.Module), (uint)token);

                            if (_type == null)
                                if ((_type = (BaseDesktopHeapType)heap.GetBasicType((ClrElementType)etype)) == null)
                                    _type = heap.DesktopErrorType;
                        }
                    }
                }

                if (_type == null)
                    _type = (BaseDesktopHeapType)heap.GetBasicType(ElementType);
            }
            else if (ElementType != ClrElementType.Class)
            {
                _type.ElementType = ElementType;
            }

            if (_type.IsArray && _type.ComponentType == null)
            {
                if (sig != IntPtr.Zero && sigLen > 0)
                {
                    SigParser sigParser = new SigParser(sig, sigLen);

                    bool res;
                    int sigType, etype = 0;

                    if (res = sigParser.GetCallingConvInfo(out sigType))
                        Debug.Assert(sigType == SigParser.IMAGE_CEE_CS_CALLCONV_FIELD);

                    res = res && sigParser.SkipCustomModifiers();
                    res = res && sigParser.GetElemType(out etype);
                    
                    res = res && sigParser.GetElemType(out etype);

                    // Generic instantiation
                    if (etype == 0x15)
                        res = res && sigParser.GetElemType(out etype);

                    // If it's a class or struct, then try to get the token
                    int token = 0;
                    if (etype == 0x11 || etype == 0x12)
                        res = res && sigParser.GetToken(out token);
                    
                    if (token != 0)
                        _type.ComponentType = heap.GetTypeByToken(heap.DesktopRuntime.GetModule(data.Module), (uint)token);
                    
                    else if (_type.ComponentType == null)
                        if ((_type.ComponentType = heap.GetBasicType((ClrElementType)etype)) == null)
                            _type.ComponentType = heap.DesktopErrorType;
                }
            }
        }