2 // location.cs: Keeps track of the location of source code entity
6 // Atsushi Enomoto <atsushi@ximian.com>
7 // Marek Safar (marek.safar@gmail.com)
9 // Copyright 2001 Ximian, Inc.
10 // Copyright 2005 Novell, Inc.
14 using System.Collections.Generic;
15 using Mono.CompilerServices.SymbolWriter;
16 using System.Diagnostics;
22 // This is one single source file.
24 public class SourceFile : IEquatable<SourceFile>
27 // Used by #line directive to track hidden sequence point
30 struct LocationRegion : IComparable<LocationRegion>
32 public readonly Location Start;
33 public readonly Location End;
35 public LocationRegion (Location start, Location end)
41 public int CompareTo (LocationRegion other)
43 if (Start.Row == other.Start.Row)
44 return Start.Column.CompareTo (other.Start.Column);
46 return Start.Row.CompareTo (other.Start.Row);
49 public override string ToString ()
51 return Start.ToString () + " - " + End.ToString ();
55 static readonly byte[] MD5Algorith = { 96, 166, 110, 64, 207, 100, 130, 76, 182, 240, 66, 212, 129, 114, 167, 153 };
57 public readonly string Name;
58 public readonly string FullPathName;
59 public readonly int Index;
60 public bool AutoGenerated;
63 byte[] algGuid, checksum;
64 List<LocationRegion> hidden_lines;
66 public SourceFile (string name, string path, int index)
70 this.FullPathName = path;
73 public byte[] Checksum {
79 public bool HasChecksum {
81 return checksum != null;
85 public SourceFileEntry SourceFileEntry {
91 public void SetChecksum (byte[] checksum)
93 SetChecksum (MD5Algorith, checksum);
96 public void SetChecksum (byte[] algorithmGuid, byte[] checksum)
98 this.algGuid = algorithmGuid;
99 this.checksum = checksum;
102 public SourceFileEntry CreateSymbolInfo (MonoSymbolFile symwriter)
104 if (hidden_lines != null)
105 hidden_lines.Sort ();
107 file = new SourceFileEntry (symwriter, FullPathName, algGuid, checksum);
109 file.SetAutoGenerated ();
114 public bool Equals (SourceFile other)
116 return FullPathName == other.FullPathName;
119 public bool IsHiddenLocation (Location loc)
121 if (hidden_lines == null)
124 int index = hidden_lines.BinarySearch (new LocationRegion (loc, loc));
127 var found = hidden_lines[index - 1];
128 if (loc.Row < found.End.Row)
135 public void RegisterHiddenScope (Location start, Location end)
137 if (hidden_lines == null)
138 hidden_lines = new List<LocationRegion> ();
140 hidden_lines.Add (new LocationRegion (start, end));
143 public override string ToString ()
145 return String.Format ("SourceFile ({0}:{1}:{2})", Name, FullPathName, Index);
150 /// Keeps track of the location in the program
154 /// This uses a compact representation and a couple of auxiliary
155 /// structures to keep track of tokens to (file,line and column)
156 /// mappings. The usage of the bits is:
158 /// - 16 bits for "checkpoint" which is a mixed concept of
159 /// file and "line segment"
160 /// - 8 bits for line delta (offset) from the line segment
161 /// - 8 bits for column number.
163 /// http://lists.ximian.com/pipermail/mono-devel-list/2004-December/009508.html
165 public struct Location : IEquatable<Location>
168 public readonly int LineOffset;
169 public readonly int File;
171 public Checkpoint (int file, int line)
174 LineOffset = line - (int) (line % (1 << line_delta_bits));
181 const int column_bits = 24;
182 const int line_delta_bits = 24;
186 const int column_bits = 8;
187 const int line_delta_bits = 8;
189 const int checkpoint_bits = 16;
191 const int column_mask = (1 << column_bits) - 1;
192 const int max_column = column_mask;
194 static List<SourceFile> source_list;
195 static int current_source;
196 static Checkpoint [] checkpoints;
197 static int checkpoint_index;
199 public readonly static Location Null = new Location ();
200 public static bool InEmacs;
207 public static void Reset ()
209 source_list = new List<SourceFile> ();
211 checkpoint_index = 0;
214 public static void AddFile (SourceFile file)
216 source_list.Add (file);
220 // After adding all source files we want to compile with AddFile(), this method
221 // must be called to `reserve' an appropriate number of bits in the token for the
222 // source file. We reserve some extra space for files we encounter via #line
223 // directives while parsing.
225 static public void Initialize (List<SourceFile> files)
227 #if NET_4_0 || MONODROID
228 source_list.AddRange (files);
230 source_list.AddRange (files.ToArray ());
233 checkpoints = new Checkpoint [System.Math.Max (1, source_list.Count * 2)];
234 if (checkpoints.Length > 0)
235 checkpoints [0] = new Checkpoint (0, 0);
238 static public void Push (SourceFile file)
240 current_source = file != null ? file.Index : -1;
241 // File is always pushed before being changed.
244 public Location (int row, int column)
249 if (column > max_column)
255 // FIXME: This value is certainly wrong but what was the intension
256 int max = checkpoint_index < 10 ?
257 checkpoint_index : 10;
258 for (int i = 0; i < max; i++) {
259 int offset = checkpoints [checkpoint_index - i].LineOffset;
260 delta = row - offset;
262 delta < (1 << line_delta_bits) &&
263 checkpoints [checkpoint_index - i].File == current_source) {
264 target = checkpoint_index - i;
269 AddCheckpoint (current_source, row);
270 target = checkpoint_index;
271 delta = row % (1 << line_delta_bits);
275 (delta << column_bits) +
276 (target << (line_delta_bits + column_bits));
280 token = l > 0xFFFFFFFF ? 0 : (int) l;
285 public static Location operator - (Location loc, int columns)
287 return new Location (loc.Row, loc.Column - columns);
290 static void AddCheckpoint (int file, int row)
292 if (checkpoints.Length == ++checkpoint_index) {
293 Array.Resize (ref checkpoints, checkpoint_index * 2);
295 checkpoints [checkpoint_index] = new Checkpoint (file, row);
298 string FormatLocation (string fileName)
300 if (column_bits == 0 || InEmacs)
301 return fileName + "(" + Row.ToString () + "):";
303 return fileName + "(" + Row.ToString () + "," + Column.ToString () +
304 (Column == max_column ? "+):" : "):");
307 public override string ToString ()
309 return FormatLocation (Name);
312 public string ToStringFullName ()
314 return FormatLocation (NameFullPath);
318 /// Whether the Location is Null
321 get { return token == 0; }
327 if (token == 0 || index <= 0)
330 SourceFile file = source_list [index - 1];
335 public string NameFullPath {
338 if (token == 0 || index <= 0)
341 return source_list[index - 1].FullPathName;
345 int CheckpointIndex {
347 const int checkpoint_mask = (1 << checkpoint_bits) - 1;
348 return ((int) (token >> (line_delta_bits + column_bits))) & checkpoint_mask;
357 int offset = checkpoints[CheckpointIndex].LineOffset;
359 const int line_delta_mask = (1 << column_bits) - 1;
360 return offset + (((int)(token >> column_bits)) & line_delta_mask);
368 return (int) (token & column_mask);
376 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));
377 return checkpoints [CheckpointIndex].File;
381 // The ISymbolDocumentWriter interface is used by the symbol writer to
382 // describe a single source file - for each source file there's exactly
383 // one corresponding ISymbolDocumentWriter instance.
385 // This class has an internal hash table mapping source document names
386 // to such ISymbolDocumentWriter instances - so there's exactly one
387 // instance per document.
389 // This property returns the ISymbolDocumentWriter instance which belongs
390 // to the location's source file.
392 // If we don't have a symbol writer, this property is always null.
393 public SourceFile SourceFile {
398 return source_list [index - 1];
402 #region IEquatable<Location> Members
404 public bool Equals (Location other)
406 return this.token == other.token;
413 // A bag of additional locations to support full ast tree
415 public class LocationsBag
417 public class MemberLocations
419 public readonly IList<Tuple<Modifiers, Location>> Modifiers;
420 Location[] locations;
422 public MemberLocations (IList<Tuple<Modifiers, Location>> mods, Location[] locs)
430 public Location this [int index] {
432 return locations [index];
438 return locations.Length;
444 public void AddLocations (params Location[] additional)
446 if (locations == null) {
447 locations = additional;
449 int pos = locations.Length;
450 Array.Resize (ref locations, pos + additional.Length);
451 additional.CopyTo (locations, pos);
456 Dictionary<object, Location[]> simple_locs = new Dictionary<object, Location[]> (ReferenceEquality<object>.Default);
457 Dictionary<MemberCore, MemberLocations> member_locs = new Dictionary<MemberCore, MemberLocations> (ReferenceEquality<MemberCore>.Default);
459 [Conditional ("FULL_AST")]
460 public void AddLocation (object element, params Location[] locations)
462 simple_locs.Add (element, locations);
465 [Conditional ("FULL_AST")]
466 public void AddStatement (object element, params Location[] locations)
468 if (locations.Length == 0)
469 throw new ArgumentException ("Statement is missing semicolon location");
471 simple_locs.Add (element, locations);
474 [Conditional ("FULL_AST")]
475 public void AddMember (MemberCore member, IList<Tuple<Modifiers, Location>> modLocations, params Location[] locations)
477 member_locs.Add (member, new MemberLocations (modLocations, locations));
480 [Conditional ("FULL_AST")]
481 public void AppendTo (object existing, params Location[] locations)
484 if (simple_locs.TryGetValue (existing, out locs)) {
485 simple_locs [existing] = locs.Concat (locations).ToArray ();
490 [Conditional ("FULL_AST")]
491 public void AppendToMember (MemberCore existing, params Location[] locations)
493 MemberLocations member;
494 if (member_locs.TryGetValue (existing, out member)) {
495 member.AddLocations (locations);
500 public Location[] GetLocations (object element)
503 simple_locs.TryGetValue (element, out found);
507 public MemberLocations GetMemberLocation (MemberCore element)
509 MemberLocations found;
510 member_locs.TryGetValue (element, out found);