コード例 #1
0
ファイル: PdbFunction.cs プロジェクト: ARLM-Attic/cs-native
        /// <summary>
        /// </summary>
        /// <param name="bits">
        /// </param>
        /// <exception cref="PdbDebugException">
        /// </exception>
        private void ReadCustomMetadata(BitAccess bits)
        {
            var  savedPosition = bits.Position;
            byte version;

            bits.ReadUInt8(out version);
            if (version != 4)
            {
                throw new PdbDebugException("Unknown custom metadata item version: {0}", version);
            }

            byte kind;

            bits.ReadUInt8(out kind);
            bits.Align(4);
            uint numberOfBytesInItem;

            bits.ReadUInt32(out numberOfBytesInItem);
            switch (kind)
            {
            case 0:
                this.ReadUsingInfo(bits);
                break;

            case 1:
                this.ReadForwardInfo(bits);
                break;

            case 2:
                this.ReadForwardedToModuleInfo(bits);
                break;

            case 3:
                this.ReadIteratorLocals(bits);
                break;

            case 4:
                this.ReadForwardIterator(bits);
                break;

            default:
                throw new PdbDebugException("Unknown custom metadata item kind: {0}", kind);
            }

            bits.Position = savedPosition + (int)numberOfBytesInItem;
        }
コード例 #2
0
ファイル: PdbFile.cs プロジェクト: ARLM-Attic/cs-native
        /// <summary>
        /// </summary>
        /// <param name="funcs">
        /// </param>
        /// <param name="names">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <param name="dir">
        /// </param>
        /// <param name="nameIndex">
        /// </param>
        /// <param name="reader">
        /// </param>
        /// <param name="limit">
        /// </param>
        private static void LoadManagedLines(
            PdbFunction[] funcs, IntHashTable names, BitAccess bits, MsfDirectory dir, Dictionary <string, int> nameIndex, PdbReader reader, uint limit)
        {
            Array.Sort(funcs, PdbFunction.byAddress);
            var checks = new IntHashTable();

            // Read the files first
            var begin = bits.Position;

            while (bits.Position < limit)
            {
                int sig;
                int siz;
                bits.ReadInt32(out sig);
                bits.ReadInt32(out siz);
                var place  = bits.Position;
                var endSym = bits.Position + siz;

                switch ((DEBUG_S_SUBSECTION)sig)
                {
                case DEBUG_S_SUBSECTION.FILECHKSMS:
                    while (bits.Position < endSym)
                    {
                        CV_FileCheckSum chk;

                        var ni = bits.Position - place;
                        bits.ReadUInt32(out chk.name);
                        bits.ReadUInt8(out chk.len);
                        bits.ReadUInt8(out chk.type);

                        var name = (string)names[(int)chk.name];
                        int guidStream;
                        var doctypeGuid  = SymDocumentType.Text;
                        var languageGuid = SymLanguageType.CSharp;
                        var vendorGuid   = SymLanguageVendor.Microsoft;
                        if (nameIndex.TryGetValue("/src/files/" + name, out guidStream))
                        {
                            var guidBits = new BitAccess(0x100);
                            dir.streams[guidStream].Read(reader, guidBits);
                            LoadGuidStream(guidBits, out doctypeGuid, out languageGuid, out vendorGuid);
                        }

                        var src = new PdbSource((uint)ni, name, doctypeGuid, languageGuid, vendorGuid);
                        checks.Add(ni, src);
                        bits.Position += chk.len;
                        bits.Align(4);
                    }

                    bits.Position = endSym;
                    break;

                default:
                    bits.Position = endSym;
                    break;
                }
            }

            // Read the lines next.
            bits.Position = begin;
            while (bits.Position < limit)
            {
                int sig;
                int siz;
                bits.ReadInt32(out sig);
                bits.ReadInt32(out siz);
                var endSym = bits.Position + siz;

                switch ((DEBUG_S_SUBSECTION)sig)
                {
                case DEBUG_S_SUBSECTION.LINES:
                {
                    CV_LineSection sec;

                    bits.ReadUInt32(out sec.off);
                    bits.ReadUInt16(out sec.sec);
                    bits.ReadUInt16(out sec.flags);
                    bits.ReadUInt32(out sec.cod);
                    var func = FindFunction(funcs, sec.sec, sec.off);
                    if (func == null)
                    {
                        break;
                    }

                    // Count the line blocks.
                    var begSym = bits.Position;
                    var blocks = 0;
                    while (bits.Position < endSym)
                    {
                        CV_SourceFile file;
                        bits.ReadUInt32(out file.index);
                        bits.ReadUInt32(out file.count);
                        bits.ReadUInt32(out file.linsiz);         // Size of payload.
                        var linsiz = (int)file.count * (8 + ((sec.flags & 1) != 0 ? 4 : 0));
                        bits.Position += linsiz;
                        blocks++;
                    }

                    func.lines = new PdbLines[blocks];
                    var block = 0;

                    bits.Position = begSym;
                    while (bits.Position < endSym)
                    {
                        CV_SourceFile file;
                        bits.ReadUInt32(out file.index);
                        bits.ReadUInt32(out file.count);
                        bits.ReadUInt32(out file.linsiz);         // Size of payload.

                        var src = (PdbSource)checks[(int)file.index];
                        var tmp = new PdbLines(src, file.count);
                        func.lines[block++] = tmp;
                        var lines = tmp.lines;

                        var plin = bits.Position;
                        var pcol = bits.Position + 8 * (int)file.count;

                        for (var i = 0; i < file.count; i++)
                        {
                            CV_Line line;
                            var     column = new CV_Column();

                            bits.Position = plin + 8 * i;
                            bits.ReadUInt32(out line.offset);
                            bits.ReadUInt32(out line.flags);

                            var lineBegin = line.flags & (uint)CV_Line_Flags.linenumStart;
                            var delta     = (line.flags & (uint)CV_Line_Flags.deltaLineEnd) >> 24;
                            var statement = (line.flags & (uint)CV_Line_Flags.fStatement) == 0;
                            if ((sec.flags & 1) != 0)
                            {
                                bits.Position = pcol + 4 * i;
                                bits.ReadUInt16(out column.offColumnStart);
                                bits.ReadUInt16(out column.offColumnEnd);
                            }

                            lines[i] = new PdbLine(line.offset, lineBegin, column.offColumnStart, lineBegin + delta, column.offColumnEnd);
                        }
                    }

                    break;
                }
                }

                bits.Position = endSym;
            }
        }
コード例 #3
0
ファイル: PdbFile.cs プロジェクト: afrog33k/csnative
        /// <summary>
        /// </summary>
        /// <param name="funcs">
        /// </param>
        /// <param name="names">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <param name="dir">
        /// </param>
        /// <param name="nameIndex">
        /// </param>
        /// <param name="reader">
        /// </param>
        /// <param name="limit">
        /// </param>
        private static void LoadManagedLines(
            PdbFunction[] funcs, IntHashTable names, BitAccess bits, MsfDirectory dir, Dictionary<string, int> nameIndex, PdbReader reader, uint limit)
        {
            Array.Sort(funcs, PdbFunction.byAddress);
            var checks = new IntHashTable();

            // Read the files first
            var begin = bits.Position;
            while (bits.Position < limit)
            {
                int sig;
                int siz;
                bits.ReadInt32(out sig);
                bits.ReadInt32(out siz);
                var place = bits.Position;
                var endSym = bits.Position + siz;

                switch ((DEBUG_S_SUBSECTION)sig)
                {
                    case DEBUG_S_SUBSECTION.FILECHKSMS:
                        while (bits.Position < endSym)
                        {
                            CV_FileCheckSum chk;

                            var ni = bits.Position - place;
                            bits.ReadUInt32(out chk.name);
                            bits.ReadUInt8(out chk.len);
                            bits.ReadUInt8(out chk.type);

                            var name = (string)names[(int)chk.name];
                            int guidStream;
                            var doctypeGuid = SymDocumentType.Text;
                            var languageGuid = SymLanguageType.CSharp;
                            var vendorGuid = SymLanguageVendor.Microsoft;
                            if (nameIndex.TryGetValue("/src/files/" + name, out guidStream))
                            {
                                var guidBits = new BitAccess(0x100);
                                dir.streams[guidStream].Read(reader, guidBits);
                                LoadGuidStream(guidBits, out doctypeGuid, out languageGuid, out vendorGuid);
                            }

                            var src = new PdbSource((uint)ni, name, doctypeGuid, languageGuid, vendorGuid);
                            checks.Add(ni, src);
                            bits.Position += chk.len;
                            bits.Align(4);
                        }

                        bits.Position = endSym;
                        break;

                    default:
                        bits.Position = endSym;
                        break;
                }
            }

            // Read the lines next.
            bits.Position = begin;
            while (bits.Position < limit)
            {
                int sig;
                int siz;
                bits.ReadInt32(out sig);
                bits.ReadInt32(out siz);
                var endSym = bits.Position + siz;

                switch ((DEBUG_S_SUBSECTION)sig)
                {
                    case DEBUG_S_SUBSECTION.LINES:
                        {
                            CV_LineSection sec;

                            bits.ReadUInt32(out sec.off);
                            bits.ReadUInt16(out sec.sec);
                            bits.ReadUInt16(out sec.flags);
                            bits.ReadUInt32(out sec.cod);
                            var func = FindFunction(funcs, sec.sec, sec.off);
                            if (func == null)
                            {
                                break;
                            }

                            // Count the line blocks.
                            var begSym = bits.Position;
                            var blocks = 0;
                            while (bits.Position < endSym)
                            {
                                CV_SourceFile file;
                                bits.ReadUInt32(out file.index);
                                bits.ReadUInt32(out file.count);
                                bits.ReadUInt32(out file.linsiz); // Size of payload.
                                var linsiz = (int)file.count * (8 + ((sec.flags & 1) != 0 ? 4 : 0));
                                bits.Position += linsiz;
                                blocks++;
                            }

                            func.lines = new PdbLines[blocks];
                            var block = 0;

                            bits.Position = begSym;
                            while (bits.Position < endSym)
                            {
                                CV_SourceFile file;
                                bits.ReadUInt32(out file.index);
                                bits.ReadUInt32(out file.count);
                                bits.ReadUInt32(out file.linsiz); // Size of payload.

                                var src = (PdbSource)checks[(int)file.index];
                                var tmp = new PdbLines(src, file.count);
                                func.lines[block++] = tmp;
                                var lines = tmp.lines;

                                var plin = bits.Position;
                                var pcol = bits.Position + 8 * (int)file.count;

                                for (var i = 0; i < file.count; i++)
                                {
                                    CV_Line line;
                                    var column = new CV_Column();

                                    bits.Position = plin + 8 * i;
                                    bits.ReadUInt32(out line.offset);
                                    bits.ReadUInt32(out line.flags);

                                    var lineBegin = line.flags & (uint)CV_Line_Flags.linenumStart;
                                    var delta = (line.flags & (uint)CV_Line_Flags.deltaLineEnd) >> 24;
                                    var statement = (line.flags & (uint)CV_Line_Flags.fStatement) == 0;
                                    if ((sec.flags & 1) != 0)
                                    {
                                        bits.Position = pcol + 4 * i;
                                        bits.ReadUInt16(out column.offColumnStart);
                                        bits.ReadUInt16(out column.offColumnEnd);
                                    }

                                    lines[i] = new PdbLine(line.offset, lineBegin, column.offColumnStart, lineBegin + delta, column.offColumnEnd);
                                }
                            }

                            break;
                        }
                }

                bits.Position = endSym;
            }
        }
コード例 #4
0
ファイル: PdbFunction.cs プロジェクト: afrog33k/csnative
        /// <summary>
        /// </summary>
        /// <param name="bits">
        /// </param>
        /// <exception cref="PdbDebugException">
        /// </exception>
        private void ReadCustomMetadata(BitAccess bits)
        {
            var savedPosition = bits.Position;
            byte version;
            bits.ReadUInt8(out version);
            if (version != 4)
            {
                throw new PdbDebugException("Unknown custom metadata item version: {0}", version);
            }

            byte kind;
            bits.ReadUInt8(out kind);
            bits.Align(4);
            uint numberOfBytesInItem;
            bits.ReadUInt32(out numberOfBytesInItem);
            switch (kind)
            {
                case 0:
                    this.ReadUsingInfo(bits);
                    break;
                case 1:
                    this.ReadForwardInfo(bits);
                    break;
                case 2:
                    this.ReadForwardedToModuleInfo(bits);
                    break;
                case 3:
                    this.ReadIteratorLocals(bits);
                    break;
                case 4:
                    this.ReadForwardIterator(bits);
                    break;
                default:
                    throw new PdbDebugException("Unknown custom metadata item kind: {0}", kind);
            }

            bits.Position = savedPosition + (int)numberOfBytesInItem;
        }
コード例 #5
0
ファイル: PdbFunction.cs プロジェクト: afrog33k/csnative
        /// <summary>
        /// </summary>
        /// <param name="module">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <param name="limit">
        /// </param>
        /// <param name="readStrings">
        /// </param>
        /// <returns>
        /// </returns>
        internal static PdbFunction[] LoadManagedFunctions(string module, BitAccess bits, uint limit, bool readStrings)
        {
            var mod = StripNamespace(module);
            var begin = bits.Position;
            var count = 0;

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

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

                switch ((SYM)rec)
                {
                    case SYM.S_GMANPROC:
                    case SYM.S_LMANPROC:
                        ManProcSym proc;
                        bits.ReadUInt32(out proc.parent);
                        bits.ReadUInt32(out proc.end);
                        bits.Position = (int)proc.end;
                        count++;
                        break;

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

                    default:

                        // Console.WriteLine("{0,6}: {1:x2} {2}",
                        // bits.Position, rec, (SYM)rec);
                        bits.Position = stop;
                        break;
                }
            }

            if (count == 0)
            {
                return null;
            }

            bits.Position = begin;
            var funcs = new PdbFunction[count];
            var func = 0;

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

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

                switch ((SYM)rec)
                {
                    case SYM.S_GMANPROC:
                    case SYM.S_LMANPROC:
                        ManProcSym proc;
                        var offset = bits.Position;

                        bits.ReadUInt32(out proc.parent);
                        bits.ReadUInt32(out proc.end);
                        bits.ReadUInt32(out proc.next);
                        bits.ReadUInt32(out proc.len);
                        bits.ReadUInt32(out proc.dbgStart);
                        bits.ReadUInt32(out proc.dbgEnd);
                        bits.ReadUInt32(out proc.token);
                        bits.ReadUInt32(out proc.off);
                        bits.ReadUInt16(out proc.seg);
                        bits.ReadUInt8(out proc.flags);
                        bits.ReadUInt16(out proc.retReg);
                        if (readStrings)
                        {
                            bits.ReadCString(out proc.name);
                        }
                        else
                        {
                            bits.SkipCString(out proc.name);
                        }

                        // Console.WriteLine("token={0:X8} [{1}::{2}]", proc.token, module, proc.name);
                        bits.Position = stop;
                        funcs[func++] = new PdbFunction(module, proc, bits);
                        break;

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

            return funcs;
        }
コード例 #6
0
ファイル: PdbFunction.cs プロジェクト: afrog33k/csnative
        /// <summary>
        /// </summary>
        /// <param name="module">
        /// </param>
        /// <param name="proc">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <exception cref="PdbDebugException">
        /// </exception>
        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;
            this.slotToken = 0;

            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);
            this.scopes = new PdbScope[scopeCount];
            var scope = 0;

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

                bits.ReadUInt16(out siz);
                var star = bits.Position;
                var 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)
                            {
                                var 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:
                        {
                            var block = new BlockSym32();

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

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

                    case SYM.S_UNAMESPACE:
                        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");
            }
        }
コード例 #7
0
ファイル: PdbFunction.cs プロジェクト: ARLM-Attic/cs-native
        /// <summary>
        /// </summary>
        /// <param name="module">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <param name="limit">
        /// </param>
        /// <param name="readStrings">
        /// </param>
        /// <returns>
        /// </returns>
        internal static PdbFunction[] LoadManagedFunctions(string module, BitAccess bits, uint limit, bool readStrings)
        {
            var mod   = StripNamespace(module);
            var begin = bits.Position;
            var count = 0;

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

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

                switch ((SYM)rec)
                {
                case SYM.S_GMANPROC:
                case SYM.S_LMANPROC:
                    ManProcSym proc;
                    bits.ReadUInt32(out proc.parent);
                    bits.ReadUInt32(out proc.end);
                    bits.Position = (int)proc.end;
                    count++;
                    break;

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

                default:

                    // Console.WriteLine("{0,6}: {1:x2} {2}",
                    // bits.Position, rec, (SYM)rec);
                    bits.Position = stop;
                    break;
                }
            }

            if (count == 0)
            {
                return(null);
            }

            bits.Position = begin;
            var funcs = new PdbFunction[count];
            var func  = 0;

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

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

                switch ((SYM)rec)
                {
                case SYM.S_GMANPROC:
                case SYM.S_LMANPROC:
                    ManProcSym proc;
                    var        offset = bits.Position;

                    bits.ReadUInt32(out proc.parent);
                    bits.ReadUInt32(out proc.end);
                    bits.ReadUInt32(out proc.next);
                    bits.ReadUInt32(out proc.len);
                    bits.ReadUInt32(out proc.dbgStart);
                    bits.ReadUInt32(out proc.dbgEnd);
                    bits.ReadUInt32(out proc.token);
                    bits.ReadUInt32(out proc.off);
                    bits.ReadUInt16(out proc.seg);
                    bits.ReadUInt8(out proc.flags);
                    bits.ReadUInt16(out proc.retReg);
                    if (readStrings)
                    {
                        bits.ReadCString(out proc.name);
                    }
                    else
                    {
                        bits.SkipCString(out proc.name);
                    }

                    // Console.WriteLine("token={0:X8} [{1}::{2}]", proc.token, module, proc.name);
                    bits.Position = stop;
                    funcs[func++] = new PdbFunction(module, proc, bits);
                    break;

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

            return(funcs);
        }
コード例 #8
0
ファイル: PdbFunction.cs プロジェクト: ARLM-Attic/cs-native
        /// <summary>
        /// </summary>
        /// <param name="module">
        /// </param>
        /// <param name="proc">
        /// </param>
        /// <param name="bits">
        /// </param>
        /// <exception cref="PdbDebugException">
        /// </exception>
        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;
            this.slotToken = 0;

            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);
            this.scopes = new PdbScope[scopeCount];
            var scope = 0;

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

                bits.ReadUInt16(out siz);
                var star = bits.Position;
                var 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)
                    {
                        var 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:
                {
                    var block = new BlockSym32();

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

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

                case SYM.S_UNAMESPACE:
                    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");
            }
        }