internal PdbFunction()

in ClrMemDiag/Utilities/PDB/PdbFunction.cs [243:392]
120 lines of code
21 McCabe index (conditional complexity)

        internal PdbFunction(/*string module, */ManProcSym proc, BitAccess bits)
        {
            this.Token = proc.token;
            //this.module = module;
            //this.name = proc.name;
            //this.flags = proc.flags;
            this.Segment = proc.seg;
            this.Address = proc.off;
            //this.length = proc.len;

            if (proc.seg != 1)
            {
                throw new PdbDebugException("Segment is {0}, not 1.", proc.seg);
            }
            if (proc.parent != 0 || proc.next != 0)
            {
                throw new PdbDebugException("Warning parent={0}, next={1}",
                                            proc.parent, proc.next);
            }
            //if (proc.dbgStart != 0 || proc.dbgEnd != 0) {
            //  throw new PdbDebugException("Warning DBG start={0}, end={1}",
            //                              proc.dbgStart, proc.dbgEnd);
            //}

            int constantCount;
            int scopeCount;
            int slotCount;
            int usedNamespacesCount;
            CountScopesAndSlots(bits, proc.end, out constantCount, out scopeCount, out slotCount, out usedNamespacesCount);
            int scope = constantCount > 0 || slotCount > 0 || usedNamespacesCount > 0 ? 1 : 0;
            int slot = 0;
            int constant = 0;
            int usedNs = 0;
            Scopes = new PdbScope[scopeCount + scope];
            Slots = new PdbSlot[slotCount];
            Constants = new PdbConstant[constantCount];
            Namespaces = new string[usedNamespacesCount];

            if (scope > 0)
                Scopes[0] = new PdbScope(this.Address, proc.len, Slots, Constants, Namespaces);

            while (bits.Position < proc.end)
            {
                ushort siz;
                ushort rec;

                bits.ReadUInt16(out siz);
                int star = bits.Position;
                int stop = bits.Position + siz;
                bits.Position = star;
                bits.ReadUInt16(out rec);

                switch ((SYM)rec)
                {
                    case SYM.S_OEM:
                        {          // 0x0404
                            OemSymbol oem;

                            bits.ReadGuid(out oem.idOem);
                            bits.ReadUInt32(out oem.typind);
                            // internal byte[]   rgl;        // user data, force 4-byte alignment

                            if (oem.idOem == msilMetaData)
                            {
                                string name = bits.ReadString();
                                if (name == "MD2")
                                {
                                    byte version;
                                    bits.ReadUInt8(out version);
                                    if (version == 4)
                                    {
                                        byte count;
                                        bits.ReadUInt8(out count);
                                        bits.Align(4);
                                        while (count-- > 0)
                                            this.ReadCustomMetadata(bits);
                                    }
                                }
                                bits.Position = stop;
                                break;
                            }
                            else
                            {
                                throw new PdbDebugException("OEM section: guid={0} ti={1}",
                                                            oem.idOem, oem.typind);
                                // bits.Position = stop;
                            }
                        }

                    case SYM.S_BLOCK32:
                        {
                            BlockSym32 block = new BlockSym32();

                            bits.ReadUInt32(out block.parent);
                            bits.ReadUInt32(out block.end);
                            bits.ReadUInt32(out block.len);
                            bits.ReadUInt32(out block.off);
                            bits.ReadUInt16(out block.seg);
                            bits.SkipCString(out block.name);
                            bits.Position = stop;

                            Scopes[scope++] = new PdbScope(this.Address, block, bits, out slotToken);
                            bits.Position = (int)block.end;
                            break;
                        }

                    case SYM.S_MANSLOT:
                        uint typind;
                        Slots[slot++] = new PdbSlot(bits, out typind);
                        bits.Position = stop;
                        break;

                    case SYM.S_MANCONSTANT:
                        Constants[constant++] = new PdbConstant(bits);
                        bits.Position = stop;
                        break;

                    case SYM.S_UNAMESPACE:
                        bits.ReadCString(out Namespaces[usedNs++]);
                        bits.Position = stop;
                        break;

                    case SYM.S_END:
                        bits.Position = stop;
                        break;

                    default:
                        {
                            //throw new PdbDebugException("Unknown SYM: {0}", (SYM)rec);
                            bits.Position = stop;
                            break;
                        }
                }
            }

            if (bits.Position != proc.end)
            {
                throw new PdbDebugException("Not at S_END");
            }

            ushort esiz;
            ushort erec;
            bits.ReadUInt16(out esiz);
            bits.ReadUInt16(out erec);

            if (erec != (ushort)SYM.S_END)
            {
                throw new PdbDebugException("Missing S_END");
            }
        }