mcs/mcs/location.cs

   1 //
   2 // location.cs: Keeps track of the location of source code entity
   3 //
   4 // Author:
   5 //   Miguel de Icaza
   6 //   Atsushi Enomoto  <atsushi@ximian.com>
   7 //   Marek Safar (marek.safar@gmail.com)
   8 //
   9 // Copyright 2001 Ximian, Inc.
  10 // Copyright 2005 Novell, Inc.
  11 //
  12
  13 using System;
  14 using System.IO;
  15 using System.Collections.Generic;
  16 using Mono.CompilerServices.SymbolWriter;
  17 using System.Diagnostics;
  18 using System.Linq;
  19
  20 namespace Mono.CSharp {
  21         /// <summary>
  22         ///   This is one single source file.
  23         /// </summary>
  24         /// <remarks>
  25         ///   This is intentionally a class and not a struct since we need
  26         ///   to pass this by reference.
  27         /// </remarks>
  28         public class SourceFile : ISourceFile {
  29                 public readonly string Name;
  30                 public readonly string Path;
  31                 public readonly int Index;
  32                 public bool AutoGenerated;
  33                 public bool IsIncludeFile;
  34
  35                 SourceFileEntry file;
  36                 byte[] guid, checksum;
  37
  38                 public SourceFile (string name, string path, int index, bool is_include)
  39                 {
  40                         this.Index = index;
  41                         this.Name = name;
  42                         this.Path = path;
  43                         this.IsIncludeFile = is_include;
  44                 }
  45
  46                 public SourceFileEntry SourceFileEntry {
  47                         get { return file; }
  48                 }
  49
  50                 SourceFileEntry ISourceFile.Entry {
  51                         get { return file; }
  52                 }
  53
  54                 public void SetChecksum (byte[] guid, byte[] checksum)
  55                 {
  56                         this.guid = guid;
  57                         this.checksum = checksum;
  58                 }
  59
  60                 public virtual void DefineSymbolInfo (MonoSymbolWriter symwriter)
  61                 {
  62                         if (guid != null)
  63                                 file = symwriter.DefineDocument (Path, guid, checksum);
  64                         else {
  65                                 file = symwriter.DefineDocument (Path);
  66                                 if (AutoGenerated)
  67                                         file.SetAutoGenerated ();
  68                         }
  69                 }
  70
  71                 public override string ToString ()
  72                 {
  73                         return String.Format ("SourceFile ({0}:{1}:{2}:{3})",
  74                                               Name, Path, Index, SourceFileEntry);
  75                 }
  76         }
  77
  78         public class CompilationUnit : SourceFile, ICompileUnit
  79         {
  80                 CompileUnitEntry comp_unit;
  81                 Dictionary<string, SourceFile> include_files;
  82                 Dictionary<string, bool> conditionals;
  83
  84                 public CompilationUnit (string name, string path, int index)
  85                         : base (name, path, index, false)
  86                 { }
  87
  88                 public void AddFile (SourceFile file)
  89                 {
  90                         if (file == this)
  91                                 return;
  92
  93                         if (include_files == null)
  94                                 include_files = new Dictionary<string, SourceFile> ();
  95
  96                         if (!include_files.ContainsKey (file.Path))
  97                                 include_files.Add (file.Path, file);
  98                 }
  99
 100                 public void AddDefine (string value)
 101                 {
 102                         if (conditionals == null)
 103                                 conditionals = new Dictionary<string, bool> (2);
 104
 105                         conditionals [value] = true;
 106                 }
 107
 108                 public void AddUndefine (string value)
 109                 {
 110                         if (conditionals == null)
 111                                 conditionals = new Dictionary<string, bool> (2);
 112
 113                         conditionals [value] = false;
 114                 }
 115
 116                 CompileUnitEntry ICompileUnit.Entry {
 117                         get { return comp_unit; }
 118                 }
 119
 120                 public CompileUnitEntry CompileUnitEntry {
 121                         get { return comp_unit; }
 122                 }
 123
 124                 public override void DefineSymbolInfo (MonoSymbolWriter symwriter)
 125                 {
 126                         base.DefineSymbolInfo (symwriter);
 127
 128                         comp_unit = symwriter.DefineCompilationUnit (SourceFileEntry);
 129
 130                         if (include_files != null) {
 131                                 foreach (SourceFile include in include_files.Values) {
 132                                         include.DefineSymbolInfo (symwriter);
 133                                         comp_unit.AddFile (include.SourceFileEntry);
 134                                 }
 135                         }
 136                 }
 137
 138                 public bool IsConditionalDefined (string value)
 139                 {
 140                         if (conditionals != null) {
 141                                 bool res;
 142                                 if (conditionals.TryGetValue (value, out res))
 143                                         return res;
 144
 145                                 // When conditional was undefined
 146                                 if (conditionals.ContainsKey (value))
 147                                         return false;
 148                         }
 149
 150                         return RootContext.IsConditionalDefined (value);
 151                 }
 152         }
 153
 154         /// <summary>
 155         ///   Keeps track of the location in the program
 156         /// </summary>
 157         ///
 158         /// <remarks>
 159         ///   This uses a compact representation and a couple of auxiliary
 160         ///   structures to keep track of tokens to (file,line and column)
 161         ///   mappings. The usage of the bits is:
 162         ///
 163         ///     - 16 bits for "checkpoint" which is a mixed concept of
 164         ///       file and "line segment"
 165         ///     - 8 bits for line delta (offset) from the line segment
 166         ///     - 8 bits for column number.
 167         ///
 168         ///   http://lists.ximian.com/pipermail/mono-devel-list/2004-December/009508.html
 169         /// </remarks>
 170         public struct Location {
 171                 int token;
 172
 173                 struct Checkpoint {
 174                         public readonly int LineOffset;
 175                         public readonly int CompilationUnit;
 176                         public readonly int File;
 177
 178                         public Checkpoint (int compile_unit, int file, int line)
 179                         {
 180                                 File = file;
 181                                 CompilationUnit = compile_unit;
 182                                 LineOffset = line - (int) (line % (1 << line_delta_bits));
 183                         }
 184                 }
 185
 186                 static List<SourceFile> source_list;
 187                 static List<CompilationUnit> compile_units;
 188                 static Dictionary<string, int> source_files;
 189                 static int checkpoint_bits;
 190                 static int source_count;
 191                 static int current_source;
 192                 static int current_compile_unit;
 193                 static int line_delta_bits;
 194                 static int line_delta_mask;
 195                 static int column_bits;
 196                 static int column_mask;
 197                 static Checkpoint [] checkpoints;
 198                 static int checkpoint_index;
 199
 200                 public readonly static Location Null = new Location (-1);
 201                 public static bool InEmacs;
 202
 203                 static Location ()
 204                 {
 205                         Reset ();
 206                         checkpoints = new Checkpoint [10];
 207                 }
 208
 209                 public static void Reset ()
 210                 {
 211                         source_files = new Dictionary<string, int> ();
 212                         source_list = new List<SourceFile> ();
 213                         compile_units = new List<CompilationUnit> ();
 214                         current_source = 0;
 215                         current_compile_unit = 0;
 216                         source_count = 0;
 217                 }
 218
 219                 // <summary>
 220                 //   This must be called before parsing/tokenizing any files.
 221                 // </summary>
 222                 static public void AddFile (Report r, string name)
 223                 {
 224                         string path = Path.GetFullPath (name);
 225                         int id;
 226                         if (source_files.TryGetValue (path, out id)){
 227                                 string other_name = source_list [id - 1].Name;
 228                                 if (name.Equals (other_name))
 229                                         r.Warning (2002, 1, "Source file `{0}' specified multiple times", other_name);
 230                                 else
 231                                         r.Warning (2002, 1, "Source filenames `{0}' and `{1}' both refer to the same file: {2}", name, other_name, path);
 232                                 return;
 233                         }
 234
 235                         source_files.Add (path, ++source_count);
 236                         CompilationUnit unit = new CompilationUnit (name, path, source_count);
 237                         source_list.Add (unit);
 238                         compile_units.Add (unit);
 239                 }
 240
 241                 public static IList<CompilationUnit> SourceFiles {
 242                         get {
 243                                 return compile_units;
 244                         }
 245                 }
 246
 247                 // <summary>
 248                 //   After adding all source files we want to compile with AddFile(), this method
 249                 //   must be called to `reserve' an appropriate number of bits in the token for the
 250                 //   source file.  We reserve some extra space for files we encounter via #line
 251                 //   directives while parsing.
 252                 // </summary>
 253                 static public void Initialize ()
 254                 {
 255                         checkpoints = new Checkpoint [source_list.Count * 2];
 256                         if (checkpoints.Length > 0)
 257                                 checkpoints [0] = new Checkpoint (0, 0, 0);
 258
 259                         column_bits = 8;
 260                         column_mask = 0xFF;
 261                         line_delta_bits = 8;
 262                         line_delta_mask = 0xFF00;
 263                         checkpoint_index = 0;
 264                         checkpoint_bits = 16;
 265                 }
 266
 267                 // <remarks>
 268                 //   This is used when we encounter a #line preprocessing directive.
 269                 // </remarks>
 270                 static public SourceFile LookupFile (CompilationUnit comp_unit, string name)
 271                 {
 272                         string path;
 273                         if (!Path.IsPathRooted (name)) {
 274                                 string root = Path.GetDirectoryName (comp_unit.Path);
 275                                 path = Path.Combine (root, name);
 276                         } else
 277                                 path = name;
 278
 279                         if (!source_files.ContainsKey (path)) {
 280                                 if (source_count >= (1 << checkpoint_bits))
 281                                         return new SourceFile (name, path, 0, true);
 282
 283                                 source_files.Add (path, ++source_count);
 284                                 SourceFile retval = new SourceFile (name, path, source_count, true);
 285                                 source_list.Add (retval);
 286                                 return retval;
 287                         }
 288
 289                         int index = (int) source_files [path];
 290                         return (SourceFile) source_list [index - 1];
 291                 }
 292
 293                 static public void Push (CompilationUnit compile_unit, SourceFile file)
 294                 {
 295                         current_source = file != null ? file.Index : -1;
 296                         current_compile_unit = compile_unit != null ? compile_unit.Index : -1;
 297                         // File is always pushed before being changed.
 298                 }
 299
 300                 // <remarks>
 301                 //   If we're compiling with debugging support, this is called between parsing
 302                 //   and code generation to register all the source files with the
 303                 //   symbol writer.
 304                 // </remarks>
 305                 static public void DefineSymbolDocuments (MonoSymbolWriter symwriter)
 306                 {
 307                         foreach (CompilationUnit unit in compile_units)
 308                                 unit.DefineSymbolInfo (symwriter);
 309                 }
 310
 311                 public Location (int row)
 312                         : this (row, 0)
 313                 {
 314                 }
 315
 316                 public Location (int row, int column)
 317                 {
 318                         if (row <= 0)
 319                                 token = 0;
 320                         else {
 321                                 if (column > 254)
 322                                         column = 254;
 323                                 if (column < 0)
 324                                         column = 255;
 325                                 int target = -1;
 326                                 int delta = 0;
 327                                 int max = checkpoint_index < 10 ?
 328                                         checkpoint_index : 10;
 329                                 for (int i = 0; i < max; i++) {
 330                                         int offset = checkpoints [checkpoint_index - i].LineOffset;
 331                                         delta = row - offset;
 332                                         if (delta >= 0 &&
 333                                                 delta < (1 << line_delta_bits) &&
 334                                                 checkpoints [checkpoint_index - i].File == current_source) {
 335                                                 target = checkpoint_index - i;
 336                                                 break;
 337                                         }
 338                                 }
 339                                 if (target == -1) {
 340                                         AddCheckpoint (current_compile_unit, current_source, row);
 341                                         target = checkpoint_index;
 342                                         delta = row % (1 << line_delta_bits);
 343                                 }
 344                                 long l = column +
 345                                         (long) (delta << column_bits) +
 346                                         (long) (target << (line_delta_bits + column_bits));
 347                                 token = l > 0xFFFFFFFF ? 0 : (int) l;
 348                         }
 349                 }
 350
 351                 public static Location operator - (Location loc, int columns)
 352                 {
 353                         return new Location (loc.Row, loc.Column - columns);
 354                 }
 355
 356                 static void AddCheckpoint (int compile_unit, int file, int row)
 357                 {
 358                         if (checkpoints.Length == ++checkpoint_index) {
 359                                 Checkpoint [] tmp = new Checkpoint [checkpoint_index * 2];
 360                                 Array.Copy (checkpoints, tmp, checkpoints.Length);
 361                                 checkpoints = tmp;
 362                         }
 363                         checkpoints [checkpoint_index] = new Checkpoint (compile_unit, file, row);
 364                 }
 365
 366                 public override string ToString ()
 367                 {
 368                         if (column_bits == 0 || InEmacs)
 369                                 return Name + "(" + Row.ToString () + "):";
 370                         else
 371                                 return Name + "(" + Row.ToString () + "," + Column.ToString () +
 372                                         (Column == column_mask ? "+):" : "):");
 373                 }
 374
 375                 /// <summary>
 376                 ///   Whether the Location is Null
 377                 /// </summary>
 378                 public bool IsNull {
 379                         get { return token == 0; }
 380                 }
 381
 382                 public string Name {
 383                         get {
 384                                 int index = File;
 385                                 if (token == 0 || index == 0)
 386                                         return "Internal";
 387
 388                                 SourceFile file = (SourceFile) source_list [index - 1];
 389                                 return file.Name;
 390                         }
 391                 }
 392
 393                 int CheckpointIndex {
 394                         get { return (int) ((token & 0xFFFF0000) >> (line_delta_bits + column_bits)); }
 395                 }
 396
 397                 public int Row {
 398                         get {
 399                                 if (token == 0)
 400                                         return 1;
 401                                 return checkpoints [CheckpointIndex].LineOffset + ((token & line_delta_mask) >> column_bits);
 402                         }
 403                 }
 404
 405                 public int Column {
 406                         get {
 407                                 if (token == 0)
 408                                         return 1;
 409                                 int col = (int) (token & column_mask);
 410                                 return col == 255 ? 1 : col;
 411                         }
 412                 }
 413
 414                 public bool Hidden {
 415                         get {
 416                                 return (int) (token & column_mask) == 255;
 417                         }
 418                 }
 419
 420                 public int CompilationUnitIndex {
 421                         get {
 422                                 if (token == 0)
 423                                         return 0;
 424 if (checkpoints.Length <= CheckpointIndex) throw new Exception (String.Format ("Should not happen. Token is {0:X04}, checkpoints are {1}, index is {2}", token, checkpoints.Length, CheckpointIndex));
 425                                 return checkpoints [CheckpointIndex].CompilationUnit;
 426                         }
 427                 }
 428
 429                 public int File {
 430                         get {
 431                                 if (token == 0)
 432                                         return 0;
 433 if (checkpoints.Length <= CheckpointIndex) throw new Exception (String.Format ("Should not happen. Token is {0:X04}, checkpoints are {1}, index is {2}", token, checkpoints.Length, CheckpointIndex));
 434                                 return checkpoints [CheckpointIndex].File;
 435                         }
 436                 }
 437
 438                 // The ISymbolDocumentWriter interface is used by the symbol writer to
 439                 // describe a single source file - for each source file there's exactly
 440                 // one corresponding ISymbolDocumentWriter instance.
 441                 //
 442                 // This class has an internal hash table mapping source document names
 443                 // to such ISymbolDocumentWriter instances - so there's exactly one
 444                 // instance per document.
 445                 //
 446                 // This property returns the ISymbolDocumentWriter instance which belongs
 447                 // to the location's source file.
 448                 //
 449                 // If we don't have a symbol writer, this property is always null.
 450                 public SourceFile SourceFile {
 451                         get {
 452                                 int index = File;
 453                                 if (index == 0)
 454                                         return null;
 455                                 return (SourceFile) source_list [index - 1];
 456                         }
 457                 }
 458
 459                 public CompilationUnit CompilationUnit {
 460                         get {
 461                                 int index = CompilationUnitIndex;
 462                                 if (index == 0)
 463                                         return null;
 464                                 return (CompilationUnit) source_list [index - 1];
 465                         }
 466                 }
 467         }
 468
 469         //
 470         // A bag of additional locations to support full ast tree
 471         //
 472         public class LocationsBag
 473         {
 474                 public class MemberLocations
 475                 {
 476                         public readonly IList<Tuple<Modifiers, Location>> Modifiers;
 477                         Location[] locations;
 478
 479                         public MemberLocations (IList<Tuple<Modifiers, Location>> mods, Location[] locs)
 480                         {
 481                                 Modifiers = mods;
 482                                 locations = locs;
 483                         }
 484
 485                         #region Properties
 486
 487                         public Location this [int index] {
 488                                 get {
 489                                         return locations [index];
 490                                 }
 491                         }
 492
 493                         public int Count {
 494                                 get {
 495                                         return locations.Length;
 496                                 }
 497                         }
 498
 499                         #endregion
 500
 501                         public void AddLocations (params Location[] additional)
 502                         {
 503                                 if (locations == null) {
 504                                         locations = additional;
 505                                 } else {
 506                                         int pos = locations.Length;
 507                                         Array.Resize (ref locations, pos + additional.Length);
 508                                         additional.CopyTo (locations, pos);
 509                                 }
 510                         }
 511                 }
 512
 513                 Dictionary<object, Location[]> simple_locs = new Dictionary<object, Location[]> (ReferenceEquality<object>.Default);
 514                 Dictionary<MemberCore, MemberLocations> member_locs = new Dictionary<MemberCore, MemberLocations> (ReferenceEquality<MemberCore>.Default);
 515
 516                 [Conditional ("FULL_AST")]
 517                 public void AddLocation (object element, params Location[] locations)
 518                 {
 519                         simple_locs.Add (element, locations);
 520                 }
 521
 522                 [Conditional ("FULL_AST")]
 523                 public void AddStatement (object element, params Location[] locations)
 524                 {
 525                         if (locations.Length == 0)
 526                                 throw new ArgumentException ("Statement is missing semicolon location");
 527
 528                         simple_locs.Add (element, locations);
 529                 }
 530
 531                 [Conditional ("FULL_AST")]
 532                 public void AddMember (MemberCore member, IList<Tuple<Modifiers, Location>> modLocations, params Location[] locations)
 533                 {
 534                         member_locs.Add (member, new MemberLocations (modLocations, locations));
 535                 }
 536
 537                 [Conditional ("FULL_AST")]
 538                 public void AppendTo (object existing, params Location[] locations)
 539                 {
 540                         Location[] locs;
 541                         if (simple_locs.TryGetValue (existing, out locs)) {
 542                                 simple_locs [existing] = locs.Concat (locations).ToArray ();
 543                                 return;
 544                         }
 545                 }
 546
 547                 [Conditional ("FULL_AST")]
 548                 public void AppendToMember (MemberCore existing, params Location[] locations)
 549                 {
 550                         MemberLocations member;
 551                         if (member_locs.TryGetValue (existing, out member)) {
 552                                 member.AddLocations (locations);
 553                                 return;
 554                         }
 555                 }
 556
 557                 public Location[] GetLocations (object element)
 558                 {
 559                         Location[] found;
 560                         simple_locs.TryGetValue (element, out found);
 561                         return found;
 562                 }
 563
 564                 public MemberLocations GetMemberLocation (MemberCore element)
 565                 {
 566                         MemberLocations found;
 567                         member_locs.TryGetValue (element, out found);
 568                         return found;
 569                 }
 570         }
 571 }