aboutsummaryrefslogtreecommitdiff
path: root/gdb/p-exp.y
blob: 213033d543883494fe7ba747958bd68b2fc240b4 (plain)
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
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
/* YACC parser for Pascal expressions, for GDB.
   Copyright (C) 2000-2020 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This file is derived from c-exp.y */

/* Parse a Pascal expression from text in a string,
   and return the result as a  struct expression  pointer.
   That structure contains arithmetic operations in reverse polish,
   with constants represented by operations that are followed by special data.
   See expression.h for the details of the format.
   What is important here is that it can be built up sequentially
   during the process of parsing; the lower levels of the tree always
   come first in the result.

   Note that malloc's and realloc's in this file are transformed to
   xmalloc and xrealloc respectively by the same sed command in the
   makefile that remaps any other malloc/realloc inserted by the parser
   generator.  Doing this with #defines and trying to control the interaction
   with include files (<malloc.h> and <stdlib.h> for example) just became
   too messy, particularly when such includes can be inserted at random
   times by the parser generator.  */

/* Known bugs or limitations:
    - pascal string operations are not supported at all.
    - there are some problems with boolean types.
    - Pascal type hexadecimal constants are not supported
      because they conflict with the internal variables format.
   Probably also lots of other problems, less well defined PM.  */
%{

#include "defs.h"
#include <ctype.h>
#include "expression.h"
#include "value.h"
#include "parser-defs.h"
#include "language.h"
#include "p-lang.h"
#include "bfd.h" /* Required by objfiles.h.  */
#include "symfile.h" /* Required by objfiles.h.  */
#include "objfiles.h" /* For have_full_symbols and have_partial_symbols.  */
#include "block.h"
#include "completer.h"

#define parse_type(ps) builtin_type (ps->gdbarch ())

/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
   etc).  */
#define GDB_YY_REMAP_PREFIX pascal_
#include "yy-remap.h"

/* The state of the parser, used internally when we are parsing the
   expression.  */

static struct parser_state *pstate = NULL;

/* Depth of parentheses.  */
static int paren_depth;

int yyparse (void);

static int yylex (void);

static void yyerror (const char *);

static char *uptok (const char *, int);
%}

/* Although the yacc "value" of an expression is not used,
   since the result is stored in the structure being created,
   other node types do have values.  */

%union
  {
    LONGEST lval;
    struct {
      LONGEST val;
      struct type *type;
    } typed_val_int;
    struct {
      gdb_byte val[16];
      struct type *type;
    } typed_val_float;
    struct symbol *sym;
    struct type *tval;
    struct stoken sval;
    struct ttype tsym;
    struct symtoken ssym;
    int voidval;
    const struct block *bval;
    enum exp_opcode opcode;
    struct internalvar *ivar;

    struct type **tvec;
    int *ivec;
  }

%{
/* YYSTYPE gets defined by %union */
static int parse_number (struct parser_state *,
			 const char *, int, int, YYSTYPE *);

static struct type *current_type;
static struct internalvar *intvar;
static int leftdiv_is_integer;
static void push_current_type (void);
static void pop_current_type (void);
static int search_field;
%}

%type <voidval> exp exp1 type_exp start normal_start variable qualified_name
%type <tval> type typebase
/* %type <bval> block */

/* Fancy type parsing.  */
%type <tval> ptype

%token <typed_val_int> INT
%token <typed_val_float> FLOAT

/* Both NAME and TYPENAME tokens represent symbols in the input,
   and both convey their data as strings.
   But a TYPENAME is a string that happens to be defined as a typedef
   or builtin type name (such as int or char)
   and a NAME is any other symbol.
   Contexts where this distinction is not important can use the
   nonterminal "name", which matches either NAME or TYPENAME.  */

%token <sval> STRING
%token <sval> FIELDNAME
%token <voidval> COMPLETE
%token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence.  */
%token <tsym> TYPENAME
%type <sval> name
%type <ssym> name_not_typename

/* A NAME_OR_INT is a symbol which is not known in the symbol table,
   but which would parse as a valid number in the current input radix.
   E.g. "c" when input_radix==16.  Depending on the parse, it will be
   turned into a name or into a number.  */

%token <ssym> NAME_OR_INT

%token STRUCT CLASS SIZEOF COLONCOLON
%token ERROR

/* Special type cases, put in to allow the parser to distinguish different
   legal basetypes.  */

%token <voidval> DOLLAR_VARIABLE


/* Object pascal */
%token THIS
%token <lval> TRUEKEYWORD FALSEKEYWORD

%left ','
%left ABOVE_COMMA
%right ASSIGN
%left NOT
%left OR
%left XOR
%left ANDAND
%left '=' NOTEQUAL
%left '<' '>' LEQ GEQ
%left LSH RSH DIV MOD
%left '@'
%left '+' '-'
%left '*' '/'
%right UNARY INCREMENT DECREMENT
%right ARROW '.' '[' '('
%left '^'
%token <ssym> BLOCKNAME
%type <bval> block
%left COLONCOLON


%%

start   :	{ current_type = NULL;
		  intvar = NULL;
		  search_field = 0;
		  leftdiv_is_integer = 0;
		}
		normal_start {}
	;

normal_start	:
		exp1
	|	type_exp
	;

type_exp:	type
			{ write_exp_elt_opcode (pstate, OP_TYPE);
			  write_exp_elt_type (pstate, $1);
			  write_exp_elt_opcode (pstate, OP_TYPE);
			  current_type = $1; } ;

/* Expressions, including the comma operator.  */
exp1	:	exp
	|	exp1 ',' exp
			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
	;

/* Expressions, not including the comma operator.  */
exp	:	exp '^'   %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_IND);
			  if (current_type)
			    current_type = TYPE_TARGET_TYPE (current_type); }
	;

exp	:	'@' exp    %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_ADDR);
			  if (current_type)
			    current_type = TYPE_POINTER_TYPE (current_type); }
	;

exp	:	'-' exp    %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
	;

exp	:	NOT exp    %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
	;

exp	:	INCREMENT '(' exp ')'   %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
	;

exp	:	DECREMENT  '(' exp ')'   %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
	;


field_exp	:	exp '.'	%prec UNARY
			{ search_field = 1; }
	;

exp	:	field_exp FIELDNAME
			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  write_exp_string (pstate, $2);
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  search_field = 0;
			  if (current_type)
			    {
			      while (TYPE_CODE (current_type)
				     == TYPE_CODE_PTR)
				current_type =
				  TYPE_TARGET_TYPE (current_type);
			      current_type = lookup_struct_elt_type (
				current_type, $2.ptr, 0);
			    }
			 }
	;


exp	:	field_exp name
			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  write_exp_string (pstate, $2);
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  search_field = 0;
			  if (current_type)
			    {
			      while (TYPE_CODE (current_type)
				     == TYPE_CODE_PTR)
				current_type =
				  TYPE_TARGET_TYPE (current_type);
			      current_type = lookup_struct_elt_type (
				current_type, $2.ptr, 0);
			    }
			}
	;
exp	:	field_exp  name COMPLETE
			{ pstate->mark_struct_expression ();
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  write_exp_string (pstate, $2);
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
	;
exp	:	field_exp COMPLETE
			{ struct stoken s;
			  pstate->mark_struct_expression ();
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			  s.ptr = "";
			  s.length = 0;
			  write_exp_string (pstate, s);
			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
	;

exp	:	exp '['
			/* We need to save the current_type value.  */
			{ const char *arrayname;
			  int arrayfieldindex;
			  arrayfieldindex = is_pascal_string_type (
				current_type, NULL, NULL,
				NULL, NULL, &arrayname);
			  if (arrayfieldindex)
			    {
			      struct stoken stringsval;
			      char *buf;

			      buf = (char *) alloca (strlen (arrayname) + 1);
			      stringsval.ptr = buf;
			      stringsval.length = strlen (arrayname);
			      strcpy (buf, arrayname);
			      current_type = TYPE_FIELD_TYPE (current_type,
				arrayfieldindex - 1);
			      write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			      write_exp_string (pstate, stringsval);
			      write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
			    }
			  push_current_type ();  }
		exp1 ']'
			{ pop_current_type ();
			  write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT);
			  if (current_type)
			    current_type = TYPE_TARGET_TYPE (current_type); }
	;

exp	:	exp '('
			/* This is to save the value of arglist_len
			   being accumulated by an outer function call.  */
			{ push_current_type ();
			  pstate->start_arglist (); }
		arglist ')'	%prec ARROW
			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
			  write_exp_elt_longcst (pstate,
						 pstate->end_arglist ());
			  write_exp_elt_opcode (pstate, OP_FUNCALL);
			  pop_current_type ();
			  if (current_type)
 	  		    current_type = TYPE_TARGET_TYPE (current_type);
			}
	;

arglist	:
         | exp
			{ pstate->arglist_len = 1; }
	 | arglist ',' exp   %prec ABOVE_COMMA
			{ pstate->arglist_len++; }
	;

exp	:	type '(' exp ')' %prec UNARY
			{ if (current_type)
			    {
			      /* Allow automatic dereference of classes.  */
			      if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
				  && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_STRUCT)
				  && (TYPE_CODE ($1) == TYPE_CODE_STRUCT))
				write_exp_elt_opcode (pstate, UNOP_IND);
			    }
			  write_exp_elt_opcode (pstate, UNOP_CAST);
			  write_exp_elt_type (pstate, $1);
			  write_exp_elt_opcode (pstate, UNOP_CAST);
			  current_type = $1; }
	;

exp	:	'(' exp1 ')'
			{ }
	;

/* Binary operators in order of decreasing precedence.  */

exp	:	exp '*' exp
			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
	;

exp	:	exp '/' {
			  if (current_type && is_integral_type (current_type))
			    leftdiv_is_integer = 1;
			}
		exp
			{
			  if (leftdiv_is_integer && current_type
			      && is_integral_type (current_type))
			    {
			      write_exp_elt_opcode (pstate, UNOP_CAST);
			      write_exp_elt_type (pstate,
						  parse_type (pstate)
						  ->builtin_long_double);
			      current_type
				= parse_type (pstate)->builtin_long_double;
			      write_exp_elt_opcode (pstate, UNOP_CAST);
			      leftdiv_is_integer = 0;
			    }

			  write_exp_elt_opcode (pstate, BINOP_DIV);
			}
	;

exp	:	exp DIV exp
			{ write_exp_elt_opcode (pstate, BINOP_INTDIV); }
	;

exp	:	exp MOD exp
			{ write_exp_elt_opcode (pstate, BINOP_REM); }
	;

exp	:	exp '+' exp
			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
	;

exp	:	exp '-' exp
			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
	;

exp	:	exp LSH exp
			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
	;

exp	:	exp RSH exp
			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
	;

exp	:	exp '=' exp
			{ write_exp_elt_opcode (pstate, BINOP_EQUAL);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp NOTEQUAL exp
			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp LEQ exp
			{ write_exp_elt_opcode (pstate, BINOP_LEQ);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp GEQ exp
			{ write_exp_elt_opcode (pstate, BINOP_GEQ);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp '<' exp
			{ write_exp_elt_opcode (pstate, BINOP_LESS);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp '>' exp
			{ write_exp_elt_opcode (pstate, BINOP_GTR);
			  current_type = parse_type (pstate)->builtin_bool;
			}
	;

exp	:	exp ANDAND exp
			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
	;

exp	:	exp XOR exp
			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
	;

exp	:	exp OR exp
			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
	;

exp	:	exp ASSIGN exp
			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
	;

exp	:	TRUEKEYWORD
			{ write_exp_elt_opcode (pstate, OP_BOOL);
			  write_exp_elt_longcst (pstate, (LONGEST) $1);
			  current_type = parse_type (pstate)->builtin_bool;
			  write_exp_elt_opcode (pstate, OP_BOOL); }
	;

exp	:	FALSEKEYWORD
			{ write_exp_elt_opcode (pstate, OP_BOOL);
			  write_exp_elt_longcst (pstate, (LONGEST) $1);
			  current_type = parse_type (pstate)->builtin_bool;
			  write_exp_elt_opcode (pstate, OP_BOOL); }
	;

exp	:	INT
			{ write_exp_elt_opcode (pstate, OP_LONG);
			  write_exp_elt_type (pstate, $1.type);
			  current_type = $1.type;
			  write_exp_elt_longcst (pstate, (LONGEST)($1.val));
			  write_exp_elt_opcode (pstate, OP_LONG); }
	;

exp	:	NAME_OR_INT
			{ YYSTYPE val;
			  parse_number (pstate, $1.stoken.ptr,
					$1.stoken.length, 0, &val);
			  write_exp_elt_opcode (pstate, OP_LONG);
			  write_exp_elt_type (pstate, val.typed_val_int.type);
			  current_type = val.typed_val_int.type;
			  write_exp_elt_longcst (pstate, (LONGEST)
						 val.typed_val_int.val);
			  write_exp_elt_opcode (pstate, OP_LONG);
			}
	;


exp	:	FLOAT
			{ write_exp_elt_opcode (pstate, OP_FLOAT);
			  write_exp_elt_type (pstate, $1.type);
			  current_type = $1.type;
			  write_exp_elt_floatcst (pstate, $1.val);
			  write_exp_elt_opcode (pstate, OP_FLOAT); }
	;

exp	:	variable
	;

exp	:	DOLLAR_VARIABLE
			/* Already written by write_dollar_variable.
			   Handle current_type.  */
 			{  if (intvar) {
 			     struct value * val, * mark;

			     mark = value_mark ();
 			     val = value_of_internalvar (pstate->gdbarch (),
 							 intvar);
 			     current_type = value_type (val);
			     value_release_to_mark (mark);
 			   }
 			}
 	;

exp	:	SIZEOF '(' type ')'	%prec UNARY
			{ write_exp_elt_opcode (pstate, OP_LONG);
			  write_exp_elt_type (pstate,
					    parse_type (pstate)->builtin_int);
			  current_type = parse_type (pstate)->builtin_int;
			  $3 = check_typedef ($3);
			  write_exp_elt_longcst (pstate,
						 (LONGEST) TYPE_LENGTH ($3));
			  write_exp_elt_opcode (pstate, OP_LONG); }
	;

exp	:	SIZEOF  '(' exp ')'      %prec UNARY
			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF);
			  current_type = parse_type (pstate)->builtin_int; }

exp	:	STRING
			{ /* C strings are converted into array constants with
			     an explicit null byte added at the end.  Thus
			     the array upper bound is the string length.
			     There is no such thing in C as a completely empty
			     string.  */
			  const char *sp = $1.ptr; int count = $1.length;

			  while (count-- > 0)
			    {
			      write_exp_elt_opcode (pstate, OP_LONG);
			      write_exp_elt_type (pstate,
						  parse_type (pstate)
						  ->builtin_char);
			      write_exp_elt_longcst (pstate,
						     (LONGEST) (*sp++));
			      write_exp_elt_opcode (pstate, OP_LONG);
			    }
			  write_exp_elt_opcode (pstate, OP_LONG);
			  write_exp_elt_type (pstate,
					      parse_type (pstate)
					      ->builtin_char);
			  write_exp_elt_longcst (pstate, (LONGEST)'\0');
			  write_exp_elt_opcode (pstate, OP_LONG);
			  write_exp_elt_opcode (pstate, OP_ARRAY);
			  write_exp_elt_longcst (pstate, (LONGEST) 0);
			  write_exp_elt_longcst (pstate,
						 (LONGEST) ($1.length));
			  write_exp_elt_opcode (pstate, OP_ARRAY); }
	;

/* Object pascal  */
exp	:	THIS
			{
			  struct value * this_val;
			  struct type * this_type;
			  write_exp_elt_opcode (pstate, OP_THIS);
			  write_exp_elt_opcode (pstate, OP_THIS);
			  /* We need type of this.  */
			  this_val
			    = value_of_this_silent (pstate->language ());
			  if (this_val)
			    this_type = value_type (this_val);
			  else
			    this_type = NULL;
			  if (this_type)
			    {
			      if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
				{
				  this_type = TYPE_TARGET_TYPE (this_type);
				  write_exp_elt_opcode (pstate, UNOP_IND);
				}
			    }

			  current_type = this_type;
			}
	;

/* end of object pascal.  */

block	:	BLOCKNAME
			{
			  if ($1.sym.symbol != 0)
			      $$ = SYMBOL_BLOCK_VALUE ($1.sym.symbol);
			  else
			    {
			      std::string copy = copy_name ($1.stoken);
			      struct symtab *tem =
				  lookup_symtab (copy.c_str ());
			      if (tem)
				$$ = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (tem),
							STATIC_BLOCK);
			      else
				error (_("No file or function \"%s\"."),
				       copy.c_str ());
			    }
			}
	;

block	:	block COLONCOLON name
			{
			  std::string copy = copy_name ($3);
			  struct symbol *tem
			    = lookup_symbol (copy.c_str (), $1,
					     VAR_DOMAIN, NULL).symbol;

			  if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
			    error (_("No function \"%s\" in specified context."),
				   copy.c_str ());
			  $$ = SYMBOL_BLOCK_VALUE (tem); }
	;

variable:	block COLONCOLON name
			{ struct block_symbol sym;

			  std::string copy = copy_name ($3);
			  sym = lookup_symbol (copy.c_str (), $1,
					       VAR_DOMAIN, NULL);
			  if (sym.symbol == 0)
			    error (_("No symbol \"%s\" in specified context."),
				   copy.c_str ());

			  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
			  write_exp_elt_block (pstate, sym.block);
			  write_exp_elt_sym (pstate, sym.symbol);
			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
	;

qualified_name:	typebase COLONCOLON name
			{
			  struct type *type = $1;

			  if (TYPE_CODE (type) != TYPE_CODE_STRUCT
			      && TYPE_CODE (type) != TYPE_CODE_UNION)
			    error (_("`%s' is not defined as an aggregate type."),
				   TYPE_NAME (type));

			  write_exp_elt_opcode (pstate, OP_SCOPE);
			  write_exp_elt_type (pstate, type);
			  write_exp_string (pstate, $3);
			  write_exp_elt_opcode (pstate, OP_SCOPE);
			}
	;

variable:	qualified_name
	|	COLONCOLON name
			{
			  std::string name = copy_name ($2);
			  struct symbol *sym;
			  struct bound_minimal_symbol msymbol;

			  sym =
			    lookup_symbol (name.c_str (),
					   (const struct block *) NULL,
					   VAR_DOMAIN, NULL).symbol;
			  if (sym)
			    {
			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
			      write_exp_elt_block (pstate, NULL);
			      write_exp_elt_sym (pstate, sym);
			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
			      break;
			    }

			  msymbol
			    = lookup_bound_minimal_symbol (name.c_str ());
			  if (msymbol.minsym != NULL)
			    write_exp_msymbol (pstate, msymbol);
			  else if (!have_full_symbols ()
				   && !have_partial_symbols ())
			    error (_("No symbol table is loaded.  "
				   "Use the \"file\" command."));
			  else
			    error (_("No symbol \"%s\" in current context."),
				   name.c_str ());
			}
	;

variable:	name_not_typename
			{ struct block_symbol sym = $1.sym;

			  if (sym.symbol)
			    {
			      if (symbol_read_needs_frame (sym.symbol))
				pstate->block_tracker->update (sym);

			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
			      write_exp_elt_block (pstate, sym.block);
			      write_exp_elt_sym (pstate, sym.symbol);
			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
			      current_type = sym.symbol->type; }
			  else if ($1.is_a_field_of_this)
			    {
			      struct value * this_val;
			      struct type * this_type;
			      /* Object pascal: it hangs off of `this'.  Must
			         not inadvertently convert from a method call
				 to data ref.  */
			      pstate->block_tracker->update (sym);
			      write_exp_elt_opcode (pstate, OP_THIS);
			      write_exp_elt_opcode (pstate, OP_THIS);
			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
			      write_exp_string (pstate, $1.stoken);
			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
			      /* We need type of this.  */
			      this_val
				= value_of_this_silent (pstate->language ());
			      if (this_val)
				this_type = value_type (this_val);
			      else
				this_type = NULL;
			      if (this_type)
				current_type = lookup_struct_elt_type (
				  this_type,
				  copy_name ($1.stoken).c_str (), 0);
			      else
				current_type = NULL;
			    }
			  else
			    {
			      struct bound_minimal_symbol msymbol;
			      std::string arg = copy_name ($1.stoken);

			      msymbol =
				lookup_bound_minimal_symbol (arg.c_str ());
			      if (msymbol.minsym != NULL)
				write_exp_msymbol (pstate, msymbol);
			      else if (!have_full_symbols ()
				       && !have_partial_symbols ())
				error (_("No symbol table is loaded.  "
				       "Use the \"file\" command."));
			      else
				error (_("No symbol \"%s\" in current context."),
				       arg.c_str ());
			    }
			}
	;


ptype	:	typebase
	;

/* We used to try to recognize more pointer to member types here, but
   that didn't work (shift/reduce conflicts meant that these rules never
   got executed).  The problem is that
     int (foo::bar::baz::bizzle)
   is a function type but
     int (foo::bar::baz::bizzle::*)
   is a pointer to member type.  Stroustrup loses again!  */

type	:	ptype
	;

typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
	:	'^' typebase
			{ $$ = lookup_pointer_type ($2); }
	|	TYPENAME
			{ $$ = $1.type; }
	|	STRUCT name
			{ $$
			    = lookup_struct (copy_name ($2).c_str (),
					     pstate->expression_context_block);
			}
	|	CLASS name
			{ $$
			    = lookup_struct (copy_name ($2).c_str (),
					     pstate->expression_context_block);
			}
	/* "const" and "volatile" are curently ignored.  A type qualifier
	   after the type is handled in the ptype rule.  I think these could
	   be too.  */
	;

name	:	NAME { $$ = $1.stoken; }
	|	BLOCKNAME { $$ = $1.stoken; }
	|	TYPENAME { $$ = $1.stoken; }
	|	NAME_OR_INT  { $$ = $1.stoken; }
	;

name_not_typename :	NAME
	|	BLOCKNAME
/* These would be useful if name_not_typename was useful, but it is just
   a fake for "variable", so these cause reduce/reduce conflicts because
   the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
   =exp) or just an exp.  If name_not_typename was ever used in an lvalue
   context where only a name could occur, this might be useful.
  	|	NAME_OR_INT
 */
	;

%%

/* Take care of parsing a number (anything that starts with a digit).
   Set yylval and return the token type; update lexptr.
   LEN is the number of characters in it.  */

/*** Needs some error checking for the float case ***/

static int
parse_number (struct parser_state *par_state,
	      const char *p, int len, int parsed_float, YYSTYPE *putithere)
{
  /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
     here, and we do kind of silly things like cast to unsigned.  */
  LONGEST n = 0;
  LONGEST prevn = 0;
  ULONGEST un;

  int i = 0;
  int c;
  int base = input_radix;
  int unsigned_p = 0;

  /* Number of "L" suffixes encountered.  */
  int long_p = 0;

  /* We have found a "L" or "U" suffix.  */
  int found_suffix = 0;

  ULONGEST high_bit;
  struct type *signed_type;
  struct type *unsigned_type;

  if (parsed_float)
    {
      /* Handle suffixes: 'f' for float, 'l' for long double.
         FIXME: This appears to be an extension -- do we want this?  */
      if (len >= 1 && tolower (p[len - 1]) == 'f')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_float;
	  len--;
	}
      else if (len >= 1 && tolower (p[len - 1]) == 'l')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_long_double;
	  len--;
	}
      /* Default type for floating-point literals is double.  */
      else
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_double;
	}

      if (!parse_float (p, len,
			putithere->typed_val_float.type,
			putithere->typed_val_float.val))
	return ERROR;
      return FLOAT;
    }

  /* Handle base-switching prefixes 0x, 0t, 0d, 0.  */
  if (p[0] == '0')
    switch (p[1])
      {
      case 'x':
      case 'X':
	if (len >= 3)
	  {
	    p += 2;
	    base = 16;
	    len -= 2;
	  }
	break;

      case 't':
      case 'T':
      case 'd':
      case 'D':
	if (len >= 3)
	  {
	    p += 2;
	    base = 10;
	    len -= 2;
	  }
	break;

      default:
	base = 8;
	break;
      }

  while (len-- > 0)
    {
      c = *p++;
      if (c >= 'A' && c <= 'Z')
	c += 'a' - 'A';
      if (c != 'l' && c != 'u')
	n *= base;
      if (c >= '0' && c <= '9')
	{
	  if (found_suffix)
	    return ERROR;
	  n += i = c - '0';
	}
      else
	{
	  if (base > 10 && c >= 'a' && c <= 'f')
	    {
	      if (found_suffix)
		return ERROR;
	      n += i = c - 'a' + 10;
	    }
	  else if (c == 'l')
	    {
	      ++long_p;
	      found_suffix = 1;
	    }
	  else if (c == 'u')
	    {
	      unsigned_p = 1;
	      found_suffix = 1;
	    }
	  else
	    return ERROR;	/* Char not a digit */
	}
      if (i >= base)
	return ERROR;		/* Invalid digit in this base.  */

      /* Portably test for overflow (only works for nonzero values, so make
	 a second check for zero).  FIXME: Can't we just make n and prevn
	 unsigned and avoid this?  */
      if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
	unsigned_p = 1;		/* Try something unsigned.  */

      /* Portably test for unsigned overflow.
	 FIXME: This check is wrong; for example it doesn't find overflow
	 on 0x123456789 when LONGEST is 32 bits.  */
      if (c != 'l' && c != 'u' && n != 0)
	{
	  if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
	    error (_("Numeric constant too large."));
	}
      prevn = n;
    }

  /* An integer constant is an int, a long, or a long long.  An L
     suffix forces it to be long; an LL suffix forces it to be long
     long.  If not forced to a larger size, it gets the first type of
     the above that it fits in.  To figure out whether it fits, we
     shift it right and see whether anything remains.  Note that we
     can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
     operation, because many compilers will warn about such a shift
     (which always produces a zero result).  Sometimes gdbarch_int_bit
     or gdbarch_long_bit will be that big, sometimes not.  To deal with
     the case where it is we just always shift the value more than
     once, with fewer bits each time.  */

  un = (ULONGEST)n >> 2;
  if (long_p == 0
      && (un >> (gdbarch_int_bit (par_state->gdbarch ()) - 2)) == 0)
    {
      high_bit
	= ((ULONGEST)1) << (gdbarch_int_bit (par_state->gdbarch ()) - 1);

      /* A large decimal (not hex or octal) constant (between INT_MAX
	 and UINT_MAX) is a long or unsigned long, according to ANSI,
	 never an unsigned int, but this code treats it as unsigned
	 int.  This probably should be fixed.  GCC gives a warning on
	 such constants.  */

      unsigned_type = parse_type (par_state)->builtin_unsigned_int;
      signed_type = parse_type (par_state)->builtin_int;
    }
  else if (long_p <= 1
	   && (un >> (gdbarch_long_bit (par_state->gdbarch ()) - 2)) == 0)
    {
      high_bit
	= ((ULONGEST)1) << (gdbarch_long_bit (par_state->gdbarch ()) - 1);
      unsigned_type = parse_type (par_state)->builtin_unsigned_long;
      signed_type = parse_type (par_state)->builtin_long;
    }
  else
    {
      int shift;
      if (sizeof (ULONGEST) * HOST_CHAR_BIT
	  < gdbarch_long_long_bit (par_state->gdbarch ()))
	/* A long long does not fit in a LONGEST.  */
	shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
      else
	shift = (gdbarch_long_long_bit (par_state->gdbarch ()) - 1);
      high_bit = (ULONGEST) 1 << shift;
      unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
      signed_type = parse_type (par_state)->builtin_long_long;
    }

   putithere->typed_val_int.val = n;

   /* If the high bit of the worked out type is set then this number
      has to be unsigned.  */

   if (unsigned_p || (n & high_bit))
     {
       putithere->typed_val_int.type = unsigned_type;
     }
   else
     {
       putithere->typed_val_int.type = signed_type;
     }

   return INT;
}


struct type_push
{
  struct type *stored;
  struct type_push *next;
};

static struct type_push *tp_top = NULL;

static void
push_current_type (void)
{
  struct type_push *tpnew;
  tpnew = (struct type_push *) malloc (sizeof (struct type_push));
  tpnew->next = tp_top;
  tpnew->stored = current_type;
  current_type = NULL;
  tp_top = tpnew;
}

static void
pop_current_type (void)
{
  struct type_push *tp = tp_top;
  if (tp)
    {
      current_type = tp->stored;
      tp_top = tp->next;
      free (tp);
    }
}

struct token
{
  const char *oper;
  int token;
  enum exp_opcode opcode;
};

static const struct token tokentab3[] =
  {
    {"shr", RSH, BINOP_END},
    {"shl", LSH, BINOP_END},
    {"and", ANDAND, BINOP_END},
    {"div", DIV, BINOP_END},
    {"not", NOT, BINOP_END},
    {"mod", MOD, BINOP_END},
    {"inc", INCREMENT, BINOP_END},
    {"dec", DECREMENT, BINOP_END},
    {"xor", XOR, BINOP_END}
  };

static const struct token tokentab2[] =
  {
    {"or", OR, BINOP_END},
    {"<>", NOTEQUAL, BINOP_END},
    {"<=", LEQ, BINOP_END},
    {">=", GEQ, BINOP_END},
    {":=", ASSIGN, BINOP_END},
    {"::", COLONCOLON, BINOP_END} };

/* Allocate uppercased var: */
/* make an uppercased copy of tokstart.  */
static char *
uptok (const char *tokstart, int namelen)
{
  int i;
  char *uptokstart = (char *)malloc(namelen+1);
  for (i = 0;i <= namelen;i++)
    {
      if ((tokstart[i]>='a' && tokstart[i]<='z'))
        uptokstart[i] = tokstart[i]-('a'-'A');
      else
        uptokstart[i] = tokstart[i];
    }
  uptokstart[namelen]='\0';
  return uptokstart;
}

/* Read one token, getting characters through lexptr.  */

static int
yylex (void)
{
  int c;
  int namelen;
  const char *tokstart;
  char *uptokstart;
  const char *tokptr;
  int explen, tempbufindex;
  static char *tempbuf;
  static int tempbufsize;

 retry:

  pstate->prev_lexptr = pstate->lexptr;

  tokstart = pstate->lexptr;
  explen = strlen (pstate->lexptr);

  /* See if it is a special token of length 3.  */
  if (explen > 2)
    for (int i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
      if (strncasecmp (tokstart, tokentab3[i].oper, 3) == 0
          && (!isalpha (tokentab3[i].oper[0]) || explen == 3
              || (!isalpha (tokstart[3])
		  && !isdigit (tokstart[3]) && tokstart[3] != '_')))
        {
          pstate->lexptr += 3;
          yylval.opcode = tokentab3[i].opcode;
          return tokentab3[i].token;
        }

  /* See if it is a special token of length 2.  */
  if (explen > 1)
  for (int i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
      if (strncasecmp (tokstart, tokentab2[i].oper, 2) == 0
          && (!isalpha (tokentab2[i].oper[0]) || explen == 2
              || (!isalpha (tokstart[2])
		  && !isdigit (tokstart[2]) && tokstart[2] != '_')))
        {
          pstate->lexptr += 2;
          yylval.opcode = tokentab2[i].opcode;
          return tokentab2[i].token;
        }

  switch (c = *tokstart)
    {
    case 0:
      if (search_field && pstate->parse_completion)
	return COMPLETE;
      else
       return 0;

    case ' ':
    case '\t':
    case '\n':
      pstate->lexptr++;
      goto retry;

    case '\'':
      /* We either have a character constant ('0' or '\177' for example)
	 or we have a quoted symbol reference ('foo(int,int)' in object pascal
	 for example).  */
      pstate->lexptr++;
      c = *pstate->lexptr++;
      if (c == '\\')
	c = parse_escape (pstate->gdbarch (), &pstate->lexptr);
      else if (c == '\'')
	error (_("Empty character constant."));

      yylval.typed_val_int.val = c;
      yylval.typed_val_int.type = parse_type (pstate)->builtin_char;

      c = *pstate->lexptr++;
      if (c != '\'')
	{
	  namelen = skip_quoted (tokstart) - tokstart;
	  if (namelen > 2)
	    {
	      pstate->lexptr = tokstart + namelen;
	      if (pstate->lexptr[-1] != '\'')
		error (_("Unmatched single quote."));
	      namelen -= 2;
              tokstart++;
              uptokstart = uptok(tokstart,namelen);
	      goto tryname;
	    }
	  error (_("Invalid character constant."));
	}
      return INT;

    case '(':
      paren_depth++;
      pstate->lexptr++;
      return c;

    case ')':
      if (paren_depth == 0)
	return 0;
      paren_depth--;
      pstate->lexptr++;
      return c;

    case ',':
      if (pstate->comma_terminates && paren_depth == 0)
	return 0;
      pstate->lexptr++;
      return c;

    case '.':
      /* Might be a floating point number.  */
      if (pstate->lexptr[1] < '0' || pstate->lexptr[1] > '9')
	{
	  goto symbol;		/* Nope, must be a symbol.  */
	}

      /* FALL THRU.  */

    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
      {
	/* It's a number.  */
	int got_dot = 0, got_e = 0, toktype;
	const char *p = tokstart;
	int hex = input_radix > 10;

	if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
	  {
	    p += 2;
	    hex = 1;
	  }
	else if (c == '0' && (p[1]=='t' || p[1]=='T'
			      || p[1]=='d' || p[1]=='D'))
	  {
	    p += 2;
	    hex = 0;
	  }

	for (;; ++p)
	  {
	    /* This test includes !hex because 'e' is a valid hex digit
	       and thus does not indicate a floating point number when
	       the radix is hex.  */
	    if (!hex && !got_e && (*p == 'e' || *p == 'E'))
	      got_dot = got_e = 1;
	    /* This test does not include !hex, because a '.' always indicates
	       a decimal floating point number regardless of the radix.  */
	    else if (!got_dot && *p == '.')
	      got_dot = 1;
	    else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
		     && (*p == '-' || *p == '+'))
	      /* This is the sign of the exponent, not the end of the
		 number.  */
	      continue;
	    /* We will take any letters or digits.  parse_number will
	       complain if past the radix, or if L or U are not final.  */
	    else if ((*p < '0' || *p > '9')
		     && ((*p < 'a' || *p > 'z')
				  && (*p < 'A' || *p > 'Z')))
	      break;
	  }
	toktype = parse_number (pstate, tokstart,
				p - tokstart, got_dot | got_e, &yylval);
        if (toktype == ERROR)
	  {
	    char *err_copy = (char *) alloca (p - tokstart + 1);

	    memcpy (err_copy, tokstart, p - tokstart);
	    err_copy[p - tokstart] = 0;
	    error (_("Invalid number \"%s\"."), err_copy);
	  }
	pstate->lexptr = p;
	return toktype;
      }

    case '+':
    case '-':
    case '*':
    case '/':
    case '|':
    case '&':
    case '^':
    case '~':
    case '!':
    case '@':
    case '<':
    case '>':
    case '[':
    case ']':
    case '?':
    case ':':
    case '=':
    case '{':
    case '}':
    symbol:
      pstate->lexptr++;
      return c;

    case '"':

      /* Build the gdb internal form of the input string in tempbuf,
	 translating any standard C escape forms seen.  Note that the
	 buffer is null byte terminated *only* for the convenience of
	 debugging gdb itself and printing the buffer contents when
	 the buffer contains no embedded nulls.  Gdb does not depend
	 upon the buffer being null byte terminated, it uses the length
	 string instead.  This allows gdb to handle C strings (as well
	 as strings in other languages) with embedded null bytes.  */

      tokptr = ++tokstart;
      tempbufindex = 0;

      do {
	/* Grow the static temp buffer if necessary, including allocating
	   the first one on demand.  */
	if (tempbufindex + 1 >= tempbufsize)
	  {
	    tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
	  }

	switch (*tokptr)
	  {
	  case '\0':
	  case '"':
	    /* Do nothing, loop will terminate.  */
	    break;
	  case '\\':
	    ++tokptr;
	    c = parse_escape (pstate->gdbarch (), &tokptr);
	    if (c == -1)
	      {
		continue;
	      }
	    tempbuf[tempbufindex++] = c;
	    break;
	  default:
	    tempbuf[tempbufindex++] = *tokptr++;
	    break;
	  }
      } while ((*tokptr != '"') && (*tokptr != '\0'));
      if (*tokptr++ != '"')
	{
	  error (_("Unterminated string in expression."));
	}
      tempbuf[tempbufindex] = '\0';	/* See note above.  */
      yylval.sval.ptr = tempbuf;
      yylval.sval.length = tempbufindex;
      pstate->lexptr = tokptr;
      return (STRING);
    }

  if (!(c == '_' || c == '$'
	|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
    /* We must have come across a bad character (e.g. ';').  */
    error (_("Invalid character '%c' in expression."), c);

  /* It's a name.  See how long it is.  */
  namelen = 0;
  for (c = tokstart[namelen];
       (c == '_' || c == '$' || (c >= '0' && c <= '9')
	|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
    {
      /* Template parameter lists are part of the name.
	 FIXME: This mishandles `print $a<4&&$a>3'.  */
      if (c == '<')
	{
	  int i = namelen;
	  int nesting_level = 1;
	  while (tokstart[++i])
	    {
	      if (tokstart[i] == '<')
		nesting_level++;
	      else if (tokstart[i] == '>')
		{
		  if (--nesting_level == 0)
		    break;
		}
	    }
	  if (tokstart[i] == '>')
	    namelen = i;
	  else
	    break;
	}

      /* do NOT uppercase internals because of registers !!!  */
      c = tokstart[++namelen];
    }

  uptokstart = uptok(tokstart,namelen);

  /* The token "if" terminates the expression and is NOT
     removed from the input stream.  */
  if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
    {
      free (uptokstart);
      return 0;
    }

  pstate->lexptr += namelen;

  tryname:

  /* Catch specific keywords.  Should be done with a data structure.  */
  switch (namelen)
    {
    case 6:
      if (strcmp (uptokstart, "OBJECT") == 0)
	{
	  free (uptokstart);
	  return CLASS;
	}
      if (strcmp (uptokstart, "RECORD") == 0)
	{
	  free (uptokstart);
	  return STRUCT;
	}
      if (strcmp (uptokstart, "SIZEOF") == 0)
	{
	  free (uptokstart);
	  return SIZEOF;
	}
      break;
    case 5:
      if (strcmp (uptokstart, "CLASS") == 0)
	{
	  free (uptokstart);
	  return CLASS;
	}
      if (strcmp (uptokstart, "FALSE") == 0)
	{
          yylval.lval = 0;
	  free (uptokstart);
          return FALSEKEYWORD;
        }
      break;
    case 4:
      if (strcmp (uptokstart, "TRUE") == 0)
	{
          yylval.lval = 1;
	  free (uptokstart);
  	  return TRUEKEYWORD;
        }
      if (strcmp (uptokstart, "SELF") == 0)
        {
          /* Here we search for 'this' like
             inserted in FPC stabs debug info.  */
	  static const char this_name[] = "this";

	  if (lookup_symbol (this_name, pstate->expression_context_block,
			     VAR_DOMAIN, NULL).symbol)
	    {
	      free (uptokstart);
	      return THIS;
	    }
	}
      break;
    default:
      break;
    }

  yylval.sval.ptr = tokstart;
  yylval.sval.length = namelen;

  if (*tokstart == '$')
    {
      char *tmp;

      /* $ is the normal prefix for pascal hexadecimal values
        but this conflicts with the GDB use for debugger variables
        so in expression to enter hexadecimal values
        we still need to use C syntax with 0xff  */
      write_dollar_variable (pstate, yylval.sval);
      tmp = (char *) alloca (namelen + 1);
      memcpy (tmp, tokstart, namelen);
      tmp[namelen] = '\0';
      intvar = lookup_only_internalvar (tmp + 1);
      free (uptokstart);
      return DOLLAR_VARIABLE;
    }

  /* Use token-type BLOCKNAME for symbols that happen to be defined as
     functions or symtabs.  If this is not so, then ...
     Use token-type TYPENAME for symbols that happen to be defined
     currently as names of types; NAME for other symbols.
     The caller is not constrained to care about the distinction.  */
  {
    std::string tmp = copy_name (yylval.sval);
    struct symbol *sym;
    struct field_of_this_result is_a_field_of_this;
    int is_a_field = 0;
    int hextype;

    is_a_field_of_this.type = NULL;
    if (search_field && current_type)
      is_a_field = (lookup_struct_elt_type (current_type,
					    tmp.c_str (), 1) != NULL);
    if (is_a_field)
      sym = NULL;
    else
      sym = lookup_symbol (tmp.c_str (), pstate->expression_context_block,
			   VAR_DOMAIN, &is_a_field_of_this).symbol;
    /* second chance uppercased (as Free Pascal does).  */
    if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
      {
       for (int i = 0; i <= namelen; i++)
         {
           if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
             tmp[i] -= ('a'-'A');
         }
       if (search_field && current_type)
	 is_a_field = (lookup_struct_elt_type (current_type,
					       tmp.c_str (), 1) != NULL);
       if (is_a_field)
	 sym = NULL;
       else
	 sym = lookup_symbol (tmp.c_str (), pstate->expression_context_block,
			      VAR_DOMAIN, &is_a_field_of_this).symbol;
      }
    /* Third chance Capitalized (as GPC does).  */
    if (!sym && is_a_field_of_this.type == NULL && !is_a_field)
      {
       for (int i = 0; i <= namelen; i++)
         {
           if (i == 0)
             {
              if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
                tmp[i] -= ('a'-'A');
             }
           else
           if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
             tmp[i] -= ('A'-'a');
          }
       if (search_field && current_type)
	 is_a_field = (lookup_struct_elt_type (current_type,
					       tmp.c_str (), 1) != NULL);
       if (is_a_field)
	 sym = NULL;
       else
	 sym = lookup_symbol (tmp.c_str (), pstate->expression_context_block,
			      VAR_DOMAIN, &is_a_field_of_this).symbol;
      }

    if (is_a_field || (is_a_field_of_this.type != NULL))
      {
	tempbuf = (char *) realloc (tempbuf, namelen + 1);
	strncpy (tempbuf, tmp.c_str (), namelen);
	tempbuf [namelen] = 0;
	yylval.sval.ptr = tempbuf;
	yylval.sval.length = namelen;
	yylval.ssym.sym.symbol = NULL;
	yylval.ssym.sym.block = NULL;
	free (uptokstart);
        yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
	if (is_a_field)
	  return FIELDNAME;
	else
	  return NAME;
      }
    /* Call lookup_symtab, not lookup_partial_symtab, in case there are
       no psymtabs (coff, xcoff, or some future change to blow away the
       psymtabs once once symbols are read).  */
    if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
        || lookup_symtab (tmp.c_str ()))
      {
	yylval.ssym.sym.symbol = sym;
	yylval.ssym.sym.block = NULL;
	yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
	free (uptokstart);
	return BLOCKNAME;
      }
    if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
        {
#if 1
	  /* Despite the following flaw, we need to keep this code enabled.
	     Because we can get called from check_stub_method, if we don't
	     handle nested types then it screws many operations in any
	     program which uses nested types.  */
	  /* In "A::x", if x is a member function of A and there happens
	     to be a type (nested or not, since the stabs don't make that
	     distinction) named x, then this code incorrectly thinks we
	     are dealing with nested types rather than a member function.  */

	  const char *p;
	  const char *namestart;
	  struct symbol *best_sym;

	  /* Look ahead to detect nested types.  This probably should be
	     done in the grammar, but trying seemed to introduce a lot
	     of shift/reduce and reduce/reduce conflicts.  It's possible
	     that it could be done, though.  Or perhaps a non-grammar, but
	     less ad hoc, approach would work well.  */

	  /* Since we do not currently have any way of distinguishing
	     a nested type from a non-nested one (the stabs don't tell
	     us whether a type is nested), we just ignore the
	     containing type.  */

	  p = pstate->lexptr;
	  best_sym = sym;
	  while (1)
	    {
	      /* Skip whitespace.  */
	      while (*p == ' ' || *p == '\t' || *p == '\n')
		++p;
	      if (*p == ':' && p[1] == ':')
		{
		  /* Skip the `::'.  */
		  p += 2;
		  /* Skip whitespace.  */
		  while (*p == ' ' || *p == '\t' || *p == '\n')
		    ++p;
		  namestart = p;
		  while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
			 || (*p >= 'a' && *p <= 'z')
			 || (*p >= 'A' && *p <= 'Z'))
		    ++p;
		  if (p != namestart)
		    {
		      struct symbol *cur_sym;
		      /* As big as the whole rest of the expression, which is
			 at least big enough.  */
		      char *ncopy
			= (char *) alloca (tmp.size () + strlen (namestart)
					   + 3);
		      char *tmp1;

		      tmp1 = ncopy;
		      memcpy (tmp1, tmp.c_str (), tmp.size ());
		      tmp1 += tmp.size ();
		      memcpy (tmp1, "::", 2);
		      tmp1 += 2;
		      memcpy (tmp1, namestart, p - namestart);
		      tmp1[p - namestart] = '\0';
		      cur_sym
			= lookup_symbol (ncopy,
					 pstate->expression_context_block,
					 VAR_DOMAIN, NULL).symbol;
		      if (cur_sym)
			{
			  if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
			    {
			      best_sym = cur_sym;
			      pstate->lexptr = p;
			    }
			  else
			    break;
			}
		      else
			break;
		    }
		  else
		    break;
		}
	      else
		break;
	    }

	  yylval.tsym.type = SYMBOL_TYPE (best_sym);
#else /* not 0 */
	  yylval.tsym.type = SYMBOL_TYPE (sym);
#endif /* not 0 */
	  free (uptokstart);
	  return TYPENAME;
        }
    yylval.tsym.type
      = language_lookup_primitive_type (pstate->language (),
					pstate->gdbarch (), tmp.c_str ());
    if (yylval.tsym.type != NULL)
      {
	free (uptokstart);
	return TYPENAME;
      }

    /* Input names that aren't symbols but ARE valid hex numbers,
       when the input radix permits them, can be names or numbers
       depending on the parse.  Note we support radixes > 16 here.  */
    if (!sym
        && ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10)
            || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
      {
 	YYSTYPE newlval;	/* Its value is ignored.  */
	hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
	if (hextype == INT)
	  {
	    yylval.ssym.sym.symbol = sym;
	    yylval.ssym.sym.block = NULL;
	    yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
	    free (uptokstart);
	    return NAME_OR_INT;
	  }
      }

    free(uptokstart);
    /* Any other kind of symbol.  */
    yylval.ssym.sym.symbol = sym;
    yylval.ssym.sym.block = NULL;
    return NAME;
  }
}

int
pascal_parse (struct parser_state *par_state)
{
  /* Setting up the parser state.  */
  scoped_restore pstate_restore = make_scoped_restore (&pstate);
  gdb_assert (par_state != NULL);
  pstate = par_state;
  paren_depth = 0;

  return yyparse ();
}

static void
yyerror (const char *msg)
{
  if (pstate->prev_lexptr)
    pstate->lexptr = pstate->prev_lexptr;

  error (_("A %s in expression, near `%s'."), msg, pstate->lexptr);
}