1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
|
//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using Microsoft.Contracts;
namespace Microsoft.Boogie {
[Immutable]
public interface IToken {
int kind {get; set; } // token kind
string filename {get; set; } // token file
int pos {get; set; } // token position in the source text (starting at 0)
int col {get; set; } // token column (starting at 0)
int line {get; set; } // token line (starting at 1)
string/*!*/ val {get; set; } // token value
bool IsValid { get; }
}
[Immutable]
public class Token : IToken {
int _kind; // token kind
string _filename; // token file
int _pos; // token position in the source text (starting at 0)
int _col; // token column (starting at 0)
int _line; // token line (starting at 1)
string/*!*/ _val = "foo"; // token value
public static IToken! NoToken = new Token();
public Token();
public Token(int linenum, int colnum) {
this._line = linenum;
this._col = colnum;
base();
}
public int kind {
get { return this._kind; }
set { this._kind = value; }
}
public string filename{
get { return this._filename; }
set { this._filename = value; }
}
public int pos{
get { return this._pos; }
set { this._pos = value; }
}
public int col{
get { return this._col; }
set { this._col = value; }
}
public int line{
get { return this._line; }
set { this._line = value; }
}
public string/*!*/ val{
get { return this._val; }
set { this._val = value; }
}
public bool IsValid { get { return this._filename != null; } }
}
}
namespace BoogiePL {
using Microsoft.Boogie;
public class Buffer {
static string/*!*/ buf;
static int bufLen;
static int pos;
public const int eof = '\uffff';
public static void Fill(StreamReader! reader) {
List<string!> defines = new List<string!>();
Fill(reader, defines);
}
struct ReadState {
public bool hasSeenElse;
public bool mayStillIncludeAnotherAlternative;
public ReadState(bool hasSeenElse, bool mayStillIncludeAnotherAlternative) {
this.hasSeenElse = hasSeenElse;
this.mayStillIncludeAnotherAlternative = mayStillIncludeAnotherAlternative;
}
}
public static void Fill(StreamReader! reader, List<string!>! defines) {
StringBuilder sb = new StringBuilder();
List<ReadState>! readState = new List<ReadState>(); // readState.Count is the current nesting level of #if's
int ignoreCutoff = -1; // -1 means we're not ignoring; for 0<=n, n means we're ignoring because of something at nesting level n
while (true)
invariant -1 <= ignoreCutoff && ignoreCutoff < readState.Count;
{
string s = reader.ReadLine();
if (s == null) {
if (readState.Count != 0) {
sb.AppendLine("#MalformedInput: missing #endif");
}
break;
}
string t = s.Trim();
if (t.StartsWith("#if")) {
ReadState rs = new ReadState(false, false);
if (ignoreCutoff != -1) {
// we're already in a state of ignoring, so continue to ignore
} else if (IfdefConditionSaysToInclude(t.Substring(3).TrimStart(), defines)) {
// include this branch
} else {
ignoreCutoff = readState.Count; // start ignoring
rs.mayStillIncludeAnotherAlternative = true; // allow some later "elsif" or "else" branch to be included
}
readState.Add(rs);
sb.AppendLine(); // ignore the #if line
} else if (t.StartsWith("#elsif")) {
ReadState rs;
if (readState.Count == 0 || (rs = readState[readState.Count-1]).hasSeenElse) {
sb.AppendLine("#MalformedInput: misplaced #elsif"); // malformed input
break;
}
if (ignoreCutoff == -1) {
// we had included the previous branch
assert !rs.mayStillIncludeAnotherAlternative;
ignoreCutoff = readState.Count-1; // start ignoring
} else if (rs.mayStillIncludeAnotherAlternative && IfdefConditionSaysToInclude(t.Substring(6).TrimStart(), defines)) {
// include this branch, but no subsequent branch at this level
ignoreCutoff = -1;
rs.mayStillIncludeAnotherAlternative = false;
readState[readState.Count-1] = rs;
}
sb.AppendLine(); // ignore the #elsif line
} else if (t == "#else") {
ReadState rs;
if (readState.Count == 0 || (rs = readState[readState.Count-1]).hasSeenElse) {
sb.AppendLine("#MalformedInput: misplaced #else"); // malformed input
break;
}
rs.hasSeenElse = true;
if (ignoreCutoff == -1) {
// we had included the previous branch
assert !rs.mayStillIncludeAnotherAlternative;
ignoreCutoff = readState.Count-1; // start ignoring
} else if (rs.mayStillIncludeAnotherAlternative) {
// include this branch
ignoreCutoff = -1;
rs.mayStillIncludeAnotherAlternative = false;
}
readState[readState.Count-1] = rs;
sb.AppendLine(); // ignore the #else line
} else if (t == "#endif") {
if (readState.Count == 0) {
sb.AppendLine("#MalformedInput: misplaced #endif"); // malformed input
break;
}
readState.RemoveAt(readState.Count-1); // pop
if (ignoreCutoff == readState.Count) {
// we had ignored the branch that ends here; so, now we start including again
ignoreCutoff = -1;
}
sb.AppendLine(); // ignore the #endif line
} else if (ignoreCutoff == -1) {
sb.AppendLine(s); // included line
} else {
sb.AppendLine(); // ignore the line
}
}
Fill(sb.ToString());
}
// "arg" is assumed to be trimmed
private static bool IfdefConditionSaysToInclude(string! arg, List<string!>! defines) {
bool sense = true;
while (arg.StartsWith("!")) {
sense = !sense;
arg = arg.Substring(1).TrimStart();
}
return defines.Contains(arg) == sense;
}
public static void Fill(string! text) {
buf = text;
bufLen = buf.Length;
pos = 0;
}
public static int Read() {
if (pos < bufLen) {
return buf[pos++];
} else {
return eof;
}
}
public static string/*!*/ ReadToEOL() {
int x = buf.IndexOf('\n', pos);
if (x == -1) {
string s = buf.Substring(pos);
pos = buf.Length;
return s;
} else {
string s = buf.Substring(pos, x+1 - pos); // also include the '\n'
pos = x+1;
return s;
}
}
public static int Pos {
get { return pos; }
set {
if (value < 0) pos = 0; else if (value >= bufLen) pos = bufLen; else pos = value;
}
}
}
public class Scanner {
const char EOF = '\0';
const char CR = '\r';
const char LF = '\n';
[Microsoft.Contracts.Verify(false)]
static Scanner() {
start[0] = 57;
start[33] = 41;
start[34] = 6;
start[35] = 2;
start[36] = 2;
start[37] = 51;
start[38] = 34;
start[39] = 2;
start[40] = 11;
start[41] = 12;
start[42] = 24;
start[43] = 47;
start[44] = 14;
start[45] = 49;
start[46] = 2;
start[47] = 50;
start[48] = 9;
start[49] = 9;
start[50] = 9;
start[51] = 9;
start[52] = 9;
start[53] = 9;
start[54] = 9;
start[55] = 9;
start[56] = 9;
start[57] = 9;
start[58] = 13;
start[59] = 10;
start[60] = 17;
start[61] = 21;
start[62] = 18;
start[63] = 2;
start[65] = 2;
start[66] = 2;
start[67] = 2;
start[68] = 2;
start[69] = 2;
start[70] = 2;
start[71] = 2;
start[72] = 2;
start[73] = 2;
start[74] = 2;
start[75] = 2;
start[76] = 2;
start[77] = 2;
start[78] = 2;
start[79] = 2;
start[80] = 2;
start[81] = 2;
start[82] = 2;
start[83] = 2;
start[84] = 2;
start[85] = 2;
start[86] = 2;
start[87] = 2;
start[88] = 2;
start[89] = 2;
start[90] = 2;
start[91] = 15;
start[92] = 1;
start[93] = 16;
start[94] = 2;
start[95] = 2;
start[96] = 2;
start[97] = 2;
start[98] = 2;
start[99] = 2;
start[100] = 2;
start[101] = 2;
start[102] = 2;
start[103] = 2;
start[104] = 2;
start[105] = 2;
start[106] = 2;
start[107] = 2;
start[108] = 2;
start[109] = 2;
start[110] = 2;
start[111] = 2;
start[112] = 2;
start[113] = 2;
start[114] = 2;
start[115] = 2;
start[116] = 2;
start[117] = 2;
start[118] = 2;
start[119] = 2;
start[120] = 2;
start[121] = 2;
start[122] = 2;
start[123] = 19;
start[124] = 37;
start[125] = 20;
start[126] = 2;
start[172] = 52;
start[8226] = 56;
start[8656] = 33;
start[8658] = 32;
start[8660] = 29;
start[8704] = 53;
start[8707] = 54;
start[8743] = 36;
start[8744] = 39;
start[8800] = 44;
start[8804] = 45;
start[8805] = 46;
}
const int noSym = 85;
static short[] start = new short[16385];
static Token/*!*/ t; // current token
static char ch; // current input character
static int pos; // column number of current character
static int line; // line number of current character
static int lineStart; // start position of current line
static Queue! oldEols; // EOLs that appeared in a comment;
static BitArray/*!*/ ignore; // set of characters to be ignored by the scanner
static string Filename;
///<summary>
///Initializes the scanner. Note: first fill the Buffer.
///</summary>
///<param name="filename">File name used for error reporting</param>
public static void Init (string filename) {
Filename = filename;
pos = -1; line = 1; lineStart = 0;
oldEols = new Queue();
NextCh();
ignore = new BitArray(16384);
ignore[9] = true; ignore[10] = true; ignore[13] = true; ignore[32] = true;
}
private static void NextCh() {
if (oldEols.Count > 0) {
ch = (char) ((!)oldEols.Dequeue());
} else {
while (true) {
ch = (char)Buffer.Read(); pos++;
if (ch == Buffer.eof) {
ch = EOF;
} else if (ch == LF) {
line++;
lineStart = pos + 1;
} else if (ch == '#' && pos == lineStart) {
int prLine = line;
int prColumn = pos - lineStart; // which is 0
string hashLine = Buffer.ReadToEOL(); pos += hashLine.Length;
line++;
lineStart = pos + 1;
hashLine = hashLine.TrimEnd(null);
if (hashLine.StartsWith("line ") || hashLine == "line") {
// parse #line pragma: #line num [filename]
string h = hashLine.Substring(4).TrimStart(null);
int x = h.IndexOf(' ');
if (x == -1) {
x = h.Length; // this will be convenient below when we look for a filename
}
try {
int li = int.Parse(h.Substring(0, x));
h = h.Substring(x).Trim();
// act on #line
line = li;
if (h.Length != 0) {
// a filename was specified
Filename = h;
}
continue; // successfully parsed and acted on the #line pragma
} catch (FormatException) {
// just fall down through to produce an error message
}
Errors.SemErr(Filename, prLine, prColumn, "Malformed (#line num [filename]) pragma: #" + hashLine);
continue;
}
Errors.SemErr(Filename, prLine, prColumn, "Unrecognized pragma: #" + hashLine);
continue;
}
return;
}
}
}
static bool Comment0() {
int level = 1, line0 = line, lineStart0 = lineStart;
NextCh();
if (ch == '/') {
NextCh();
for(;;) {
if (ch == 10) {
level--;
if (level == 0) {
while(line0 < line) {oldEols.Enqueue('\r'); oldEols.Enqueue('\n'); line0++;}
NextCh(); return true;
}
NextCh();
} else if (ch == EOF) return false;
else NextCh();
}
} else {
if (ch==CR) {line--; lineStart = lineStart0;}
pos = pos - 2; Buffer.Pos = pos+1; NextCh();
}
return false;
}
static bool Comment1() {
int level = 1, line0 = line, lineStart0 = lineStart;
NextCh();
if (ch == '*') {
NextCh();
for(;;) {
if (ch == '*') {
NextCh();
if (ch == '/') {
level--;
if (level == 0) {
while(line0 < line) {oldEols.Enqueue('\r'); oldEols.Enqueue('\n'); line0++;}
NextCh(); return true;
}
NextCh();
}
} else if (ch == '/') {
NextCh();
if (ch == '*') {
level++; NextCh();
}
} else if (ch == EOF) return false;
else NextCh();
}
} else {
if (ch==CR) {line--; lineStart = lineStart0;}
pos = pos - 2; Buffer.Pos = pos+1; NextCh();
}
return false;
}
static void CheckLiteral() {
switch (t.val) {
case "var": t.kind = 6; break;
case "where": t.kind = 12; break;
case "int": t.kind = 13; break;
case "bool": t.kind = 14; break;
case "const": t.kind = 19; break;
case "unique": t.kind = 20; break;
case "extends": t.kind = 21; break;
case "complete": t.kind = 22; break;
case "function": t.kind = 23; break;
case "returns": t.kind = 24; break;
case "axiom": t.kind = 27; break;
case "type": t.kind = 28; break;
case "procedure": t.kind = 30; break;
case "implementation": t.kind = 31; break;
case "modifies": t.kind = 32; break;
case "free": t.kind = 33; break;
case "requires": t.kind = 34; break;
case "ensures": t.kind = 35; break;
case "goto": t.kind = 38; break;
case "return": t.kind = 39; break;
case "if": t.kind = 40; break;
case "else": t.kind = 41; break;
case "while": t.kind = 42; break;
case "invariant": t.kind = 43; break;
case "break": t.kind = 45; break;
case "assert": t.kind = 46; break;
case "assume": t.kind = 47; break;
case "havoc": t.kind = 48; break;
case "call": t.kind = 50; break;
case "forall": t.kind = 51; break;
case "false": t.kind = 77; break;
case "true": t.kind = 78; break;
case "old": t.kind = 79; break;
case "exists": t.kind = 81; break;
default: break;
}
}
public static Token/*!*/ Scan() {
while (ignore[ch]) { NextCh(); }
if (ch == '/' && Comment0() || ch == '/' && Comment1() ) return Scan();
t = new Token();
t.pos = pos; t.col = pos - lineStart + 1; t.line = line; t.filename = Filename;
int state = (/*^ (!) ^*/ start)[ch];
StringBuilder buf = new StringBuilder(16);
buf.Append(ch); NextCh();
switch (state) {
case 0: {t.kind = noSym; goto done;} // NextCh already done
case 1:
if ((ch >= '#' && ch <= '$' || ch == 39 || ch == '.' || ch == '?' || ch >= 'A' && ch <= 'Z' || ch >= '^' && ch <= 'z' || ch == '~')) {buf.Append(ch); NextCh(); goto case 2;}
else {t.kind = noSym; goto done;}
case 2:
if ((ch >= '#' && ch <= '$' || ch == 39 || ch == '.' || ch >= '0' && ch <= '9' || ch == '?' || ch >= 'A' && ch <= 'Z' || ch >= '^' && ch <= 'z' || ch == '~')) {buf.Append(ch); NextCh(); goto case 2;}
else {t.kind = 1; t.val = buf.ToString(); CheckLiteral(); return t;}
case 3:
if (ch == 'v') {buf.Append(ch); NextCh(); goto case 4;}
else {t.kind = noSym; goto done;}
case 4:
if ((ch >= '0' && ch <= '9')) {buf.Append(ch); NextCh(); goto case 5;}
else {t.kind = noSym; goto done;}
case 5:
if ((ch >= '0' && ch <= '9')) {buf.Append(ch); NextCh(); goto case 5;}
else {t.kind = 2; goto done;}
case 6:
if ((ch == '"')) {buf.Append(ch); NextCh(); goto case 7;}
else if ((ch >= ' ' && ch <= '!' || ch >= '#' && ch <= '~')) {buf.Append(ch); NextCh(); goto case 6;}
else {t.kind = noSym; goto done;}
case 7:
{t.kind = 4; goto done;}
case 8:
if ((ch >= '0' && ch <= '9')) {buf.Append(ch); NextCh(); goto case 8;}
else {t.kind = 5; goto done;}
case 9:
if ((ch >= '0' && ch <= '9')) {buf.Append(ch); NextCh(); goto case 9;}
else if (ch == 'b') {buf.Append(ch); NextCh(); goto case 3;}
else if (ch == '.') {buf.Append(ch); NextCh(); goto case 8;}
else {t.kind = 3; goto done;}
case 10:
{t.kind = 7; goto done;}
case 11:
{t.kind = 8; goto done;}
case 12:
{t.kind = 9; goto done;}
case 13:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 25;}
else if (ch == ':') {buf.Append(ch); NextCh(); goto case 55;}
else {t.kind = 10; goto done;}
case 14:
{t.kind = 11; goto done;}
case 15:
{t.kind = 15; goto done;}
case 16:
{t.kind = 16; goto done;}
case 17:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 26;}
else if (ch == ':') {buf.Append(ch); NextCh(); goto case 43;}
else {t.kind = 17; goto done;}
case 18:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 40;}
else {t.kind = 18; goto done;}
case 19:
if (ch == '{') {buf.Append(ch); NextCh(); goto case 22;}
else {t.kind = 25; goto done;}
case 20:
if (ch == '}') {buf.Append(ch); NextCh(); goto case 23;}
else {t.kind = 26; goto done;}
case 21:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 30;}
else {t.kind = 29; goto done;}
case 22:
{t.kind = 36; goto done;}
case 23:
{t.kind = 37; goto done;}
case 24:
{t.kind = 44; goto done;}
case 25:
{t.kind = 49; goto done;}
case 26:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 27;}
else {t.kind = 63; goto done;}
case 27:
if (ch == '>') {buf.Append(ch); NextCh(); goto case 28;}
else {t.kind = 56; goto done;}
case 28:
{t.kind = 52; goto done;}
case 29:
{t.kind = 53; goto done;}
case 30:
if (ch == '>') {buf.Append(ch); NextCh(); goto case 31;}
else {t.kind = 62; goto done;}
case 31:
{t.kind = 54; goto done;}
case 32:
{t.kind = 55; goto done;}
case 33:
{t.kind = 57; goto done;}
case 34:
if (ch == '&') {buf.Append(ch); NextCh(); goto case 35;}
else {t.kind = noSym; goto done;}
case 35:
{t.kind = 58; goto done;}
case 36:
{t.kind = 59; goto done;}
case 37:
if (ch == '|') {buf.Append(ch); NextCh(); goto case 38;}
else {t.kind = noSym; goto done;}
case 38:
{t.kind = 60; goto done;}
case 39:
{t.kind = 61; goto done;}
case 40:
{t.kind = 64; goto done;}
case 41:
if (ch == '=') {buf.Append(ch); NextCh(); goto case 42;}
else {t.kind = 75; goto done;}
case 42:
{t.kind = 65; goto done;}
case 43:
{t.kind = 66; goto done;}
case 44:
{t.kind = 67; goto done;}
case 45:
{t.kind = 68; goto done;}
case 46:
{t.kind = 69; goto done;}
case 47:
if (ch == '+') {buf.Append(ch); NextCh(); goto case 48;}
else {t.kind = 71; goto done;}
case 48:
{t.kind = 70; goto done;}
case 49:
{t.kind = 72; goto done;}
case 50:
{t.kind = 73; goto done;}
case 51:
{t.kind = 74; goto done;}
case 52:
{t.kind = 76; goto done;}
case 53:
{t.kind = 80; goto done;}
case 54:
{t.kind = 82; goto done;}
case 55:
{t.kind = 83; goto done;}
case 56:
{t.kind = 84; goto done;}
case 57: {t.kind = 0; goto done;}
}
done:
t.val = buf.ToString();
return t;
}
} // end Scanner
public delegate void ErrorProc(int n, string filename, int line, int col);
public class Errors {
public static int count = 0; // number of errors detected
public static ErrorProc/*!*/ SynErr; // syntactic errors
public static void SemErr(string filename, int line, int col, string! msg) { // semantic errors
ConsoleColor color = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("{0}({1},{2}): Error: {3}", filename, line, col, msg);
Console.ForegroundColor = color;
count++;
}
public static void SemErr(IToken! tok, string! msg) { // semantic errors
SemErr(tok.filename, tok.line, tok.col, msg);
}
public static void Exception (string s) {
ConsoleColor color = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine(s);
Console.ForegroundColor = color;
System.Environment.Exit(0);
}
} // Errors
} // end namespace
|