This file is indexed.

/usr/share/gnu-smalltalk/kernel/SysExcept.st is in gnu-smalltalk-common 3.2.5-1build2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   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
"======================================================================
|
|   ANSI exception handling classes
|
|
 ======================================================================"

"======================================================================
|
| Copyright 2000, 2001, 2002, 2007, 2008, 2009 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
| 
| The GNU Smalltalk class library 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 Lesser
| General Public License for more details.
| 
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.  
|
 ======================================================================"



Exception subclass: Error [
    
    <category: 'Language-Exceptions'>
    <comment: 'Error represents a fatal error.  Instances of it are not resumable.'>

    description [
	"Answer a textual description of the exception."

	<category: 'exception description'>
	^'An exceptional condition has occurred, and has prevented normal
continuation of processing.'
    ]

    isResumable [
	"Answer false.  Error exceptions are by default unresumable; subclasses
	 can override this method if desired."

	<category: 'exception description'>
	^false
    ]
]



Exception subclass: Notification [
    
    <category: 'Language-Exceptions'>
    <comment: 'Notification represents a resumable, exceptional yet non-erroneous,
situation.  Signaling a notification in absence of an handler simply
returns nil.'>

    description [
	"Answer a textual description of the exception."

	<category: 'exception description'>
	^'An exceptional condition has occurred, but it is not to be considered
an error.'
    ]

    isResumable [
	"Answer true.  Notification exceptions are by default resumable."

	<category: 'exception description'>
	^true
    ]

    defaultAction [
	"Do the default action for notifications, which is to resume execution
	 of the context which signaled the exception."

	<category: 'exception description'>
	self resume: nil
    ]
]



Notification subclass: Warning [
    
    <category: 'Language-Exceptions'>
    <comment: 'Warning represents an `important'' but resumable error.'>

    description [
	"Answer a textual description of the exception."

	<category: 'exception description'>
	^'An exceptional condition has occurred.  It is reported to the user
even though it is not to be considered an error.'
    ]
]


Exception subclass: Halt [
    
    <category: 'Language-Exceptions'>
    <comment: 'Halt represents a resumable error, usually a bug.'>

    description [
	"Answer a textual description of the exception."

	<category: 'description'>
	^'#halt was sent.'
    ]

    isResumable [
	"Answer true.  #halt exceptions are by default resumable."

	<category: 'description'>
	^true
    ]
]



Error subclass: ArithmeticError [
    
    <category: 'Language-Exceptions'>
    <comment: 'An ArithmeticError exception is raised by numeric classes when a program
tries to do something wrong, such as extracting the square root of a
negative number.'>

    description [
	"Answer a textual description of the exception."

	<category: 'description'>
	^'The program attempted to do an impossible arithmetic operation'
    ]

    isResumable [
	"Answer true.  Arithmetic exceptions are by default resumable."

	<category: 'description'>
	^true
    ]
]



Error subclass: MessageNotUnderstood [
    | message receiver |
    
    <category: 'Language-Exceptions'>
    <comment: 'MessageNotUnderstood represents an error during message lookup. Signaling
it is the default action of the #doesNotUnderstand: handler'>

    message [
	"Answer the message that wasn't understood"

	<category: 'accessing'>
	^message
    ]

    receiver [
	"Answer the object to whom the message send was directed"

	<category: 'accessing'>
	^receiver
    ]

    message: aMessage receiver: anObject [
	<category: 'private'>
	message := aMessage.
	receiver := anObject.
	self messageText: 'did not understand ' , message selector printString
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'description'>
	^'The program sent a message which was not understood by the receiver.'
    ]

    isResumable [
	"Answer true.  #doesNotUnderstand: exceptions are by default resumable."

	<category: 'description'>
	^true
    ]
]



ArithmeticError subclass: ZeroDivide [
    | dividend |
    
    <category: 'Language-Exceptions'>
    <comment: 'A ZeroDivide exception is raised by numeric classes when a program tries
to divide by zero.  Information on the dividend is available to the
handler.'>

    ZeroDivide class >> dividend: aNumber [
	"Create a new ZeroDivide object remembering that the dividend was
	 aNumber."

	<category: 'instance creation'>
	^super new dividend: aNumber
    ]

    ZeroDivide class >> new [
	"Create a new ZeroDivide object; the dividend is conventionally
	 set to zero."

	<category: 'instance creation'>
	^super new dividend: 0
    ]

    dividend [
	"Answer the number that was being divided by zero"

	<category: 'accessing'>
	^dividend
    ]

    dividend: aNumber [
	<category: 'private'>
	dividend := aNumber
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'description'>
	^'The program attempted to divide a number by zero'
    ]
]



Namespace current: SystemExceptions [

Notification subclass: ProcessBeingTerminated [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a process is terminated.'>

    | semaphore |

    ProcessBeingTerminated class >> initialize [
	(UndefinedObject>>#'__terminate')
	    makeReadOnly: false;
	    descriptor: ((MethodInfo new: 1)
		methodClass: UndefinedObject;
		selector: #'__terminate';
		at: 1 put: (Message
		    selector: #exceptionHandlerSearch:reset:
		    arguments: {
			[ :context :signal |
			    (self handles: signal)
				ifTrue: [
				    signal
					onDoBlock: nil
					handlerBlock: [ :sig | thisContext environment continue: nil ]
					onDoContext: nil
					previousState: nil.
				    #found ]
				ifFalse: [nil] ].
			[ :context | ] });
		yourself);
	    makeReadOnly: true
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'the current process is being terminated'
    ]

    semaphore [
	"If the process was waiting on a semaphore, answer it."

	<category: 'accessing'>
	^semaphore
    ]

    semaphore: aSemaphore [
	"If the process was waiting on a semaphore, answer it."

	<category: 'accessing'>
	semaphore := aSemaphore
    ]
]

]


Namespace current: SystemExceptions [

Notification subclass: EndOfStream [
    | stream |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a stream reaches its end.'>

    EndOfStream class >> signalOn: stream [
	"Answer an exception reporting the parameter has reached its end."

	<category: 'signaling'>
	^(self new)
	    stream: stream;
	    signal
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'end of stream reached'
    ]

    stream [
	"Answer the stream whose end was reached."

	<category: 'accessing'>
	^stream
    ]

    stream: anObject [
	"Set the stream whose end was reached."

	<category: 'accessing'>
	stream := anObject
    ]
]

]



Namespace current: SystemExceptions [

Error subclass: NotEnoughElements [
    | remainingCount |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes #next: but not enough items remain in the
stream.'>

    NotEnoughElements class >> signalOn: remainingCount [
	"Answer an exception reporting the parameter as invalid."

	<category: 'signaling'>
	^(self new)
	    remainingCount: remainingCount;
	    signal
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'premature end of stream'
    ]

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'%1: %2 element(s) missing' % 
		{self basicMessageText.
		self remainingCount}
    ]

    remainingCount [
	"Answer the number of items that were to be read."

	<category: 'accessing'>
	^remainingCount
    ]

    remainingCount: anObject [
	"Set the number of items that were to be read."

	<category: 'accessing'>
	remainingCount := anObject
    ]
]

]



Namespace current: SystemExceptions [

Error subclass: InvalidValue [
    | value |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a method with an invalid receiver or argument.'>

    InvalidValue class >> signalOn: value [
	"Answer an exception reporting the parameter as invalid."

	<category: 'signaling'>
	^(self new)
	    value: value;
	    signal
    ]

    InvalidValue class >> signalOn: value reason: reason [
	"Answer an exception reporting `value' as invalid, for the given
	 reason."

	<category: 'signaling'>
	^(self new)
	    value: value;
	    signal: reason
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'unknown error'
    ]

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'Invalid value %1: %2' % 
		{self value.
		self basicMessageText}
    ]

    value [
	"Answer the object that was found to be invalid."

	<category: 'accessing'>
	^value
    ]

    value: anObject [
	"Set the object that was found to be invalid."

	<category: 'accessing'>
	value := anObject
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: InvalidState [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a method and the receiver or an argument
are in an invalid state for the method.'>

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'%1 is in an invalid state: %2' % 
		{self value.
		self basicMessageText}
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: NotIndexable [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when an object is not indexable.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'object not indexable'
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: ReadOnlyObject [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one writes to a read-only object.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'object is read-only'
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: EmptyCollection [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a method on an empty collection.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'the collection is empty'
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: InvalidArgument [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a method with an invalid argument.'>

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'Invalid argument %1: %2' % 
		{self value.
		self basicMessageText}
    ]
]

]



Namespace current: SystemExceptions [

InvalidArgument subclass: AlreadyDefined [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one tries to define a symbol (class or pool variable) that
is already defined.'>

    description [
	"Answer a description for the error"

	<category: 'accessing'>
	^'symbol already defined'
    ]
]

]



Namespace current: SystemExceptions [

InvalidArgument subclass: ArgumentOutOfRange [
    | low high |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a method with an argument outside of its
valid range.'>

    ArgumentOutOfRange class >> signalOn: value mustBeBetween: low and: high [
	"Raise the exception.  The given value was not between low and high."

	<category: 'signaling'>
	| errorString |
	errorString := RegressionTesting 
		    ifTrue: ['argument out of range']
		    ifFalse: 
			['argument must be between ' , low printString , ' and ' , high printString].
	^(self new)
	    value: value;
	    low: low;
	    high: high;
	    signal: errorString
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'argument out of range'
    ]

    low [
	"Answer the lowest value that was permitted."

	<category: 'accessing'>
	^low
    ]

    low: aMagnitude [
	"Set the lowest value that was permitted."

	<category: 'accessing'>
	low := aMagnitude
    ]

    high [
	"Answer the highest value that was permitted."

	<category: 'accessing'>
	^high
    ]

    high: aMagnitude [
	"Set the highest value that was permitted."

	<category: 'accessing'>
	high := aMagnitude
    ]
]

]



Namespace current: SystemExceptions [

ArgumentOutOfRange subclass: IndexOutOfRange [
    | collection |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes am accessor method with an index outside of its
valid range.'>

    IndexOutOfRange class >> signalOn: aCollection withIndex: value [
	"The given index was out of range in aCollection."

	<category: 'signaling'>
	^(self new)
	    collection: aCollection;
	    value: value;
	    signal
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'index out of range'
    ]

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'Invalid index %1: %2' % 
		{self value.
		self basicMessageText}
    ]

    collection [
	"Answer the collection that triggered the error"

	<category: 'accessing'>
	^collection
    ]

    collection: anObject [
	"Set the collection that triggered the error"

	<category: 'accessing'>
	collection := anObject
    ]
]

]



Namespace current: SystemExceptions [

InvalidArgument subclass: InvalidSize [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when an argument has an invalid size.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'invalid size'
    ]
]

]



Namespace current: SystemExceptions [

InvalidArgument subclass: NotFound [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when something is searched without success.'>

    NotFound class >> signalOn: value what: aString [
	"Raise an exception; aString specifies what was not found (a key,
	 an object, a class, and so on)."

	<category: 'accessing'>
	^(self new)
	    value: value;
	    signal: aString , ' not found'
    ]

    NotFound class >> signalOn: value reason: aString [
	"Raise an exception: reason specifies the reason of the exception."

	<category: 'accessing'>
	^(self new)
	    value: value;
	    signal: aString
    ]
 
    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'not found'
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: WrongClass [
    | validClasses |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when an argument is constrained to be an instance of a determinate
class, and this constraint is not respected by the caller.'>

    WrongClass class >> signalOn: anObject mustBe: aClassOrArray [
	"Raise an exception.  The given object should have been an instance
	 of one of the classes indicated by aClassOrArray (which should be
	 a single class or an array of classes).  Whether instances of
	 subclasses are allowed should be clear from the context, though
	 in general (i.e. with the exception of a few system messages)
	 they should be."

	<category: 'signaling'>
	(aClassOrArray isKindOf: Collection) 
	    ifFalse: [^self signalOn: anObject mustBe: {aClassOrArray binding}].
	^(self new)
	    validClasses: aClassOrArray;
	    value: anObject;
	    signal
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'wrong argument type'
    ]

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	self validClasses isNil 
	    ifTrue: [^'Invalid argument ' , self value printString].
	^'Invalid argument %1: must be %2' % 
		{self value.
		self validClassesString}
    ]

    validClasses [
	"Answer the list of classes whose instances would have been valid."

	<category: 'accessing'>
	^validClasses
    ]

    validClassesString [
	"Answer the list of classes whose instances would have been valid,
	 formatted as a string."

	<category: 'accessing'>
	^String streamContents: 
		[:str | 
		validClasses keysAndValuesDo: 
			[:idx :classOrBinding | 
			| name class |
			idx > 1 
			    ifTrue: 
				[idx = validClasses size 
				    ifFalse: [str nextPutAll: ', ']
				    ifTrue: [str nextPutAll: ' or ']].
			class := classOrBinding isClass 
				    ifTrue: [classOrBinding]
				    ifFalse: [classOrBinding value].
			name := class nameIn: Namespace current.
			name first isVowel 
			    ifTrue: [str nextPutAll: 'an ']
			    ifFalse: [str nextPutAll: 'a '].
			str nextPutAll: name]]
    ]

    validClasses: aCollection [
	"Set the list of classes whose instances would have been valid."

	<category: 'accessing'>
	validClasses := aCollection
    ]
]

]



Namespace current: SystemExceptions [

WrongClass subclass: MustBeBoolean [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one invokes a boolean method on a non-boolean.'>

    MustBeBoolean class >> signalOn: anObject [
	"Signal a new exception, with the bad value in question being
	 anObject."
	<category: 'signaling'>
	^self signalOn: anObject mustBe: #(#{Boolean})
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: ProcessTerminated [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when somebody tries to resume or interrupt a terminated process.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'process has/was already terminated'
    ]
]

]



Namespace current: SystemExceptions [

InvalidValue subclass: InvalidProcessState [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am an error raised when trying to resume a terminated process, or
stuff like that.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'invalid operation for this process'
    ]
]

]



Namespace current: SystemExceptions [

Error subclass: MutationError [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am an error raised when a class is mutated in an invalid way.'>

    MutationError class >> new [
	"Create an instance of the receiver, which you will be able to
	 signal later."

	<category: 'instance creation'>
	^self basicNew initialize: nil
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'cannot mutate the class this way'
    ]
]

]



Namespace current: SystemExceptions [

Error subclass: VMError [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am an error related to the innards of the system.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'virtual machine error'
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: SecurityError [
    | failedPermission |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am an error raised when an untrusted object tries to do an insecure
operation.'>

    SecurityError class >> signal: aPermission [
	"Raise the exception, setting to aPermission the permission
	 that was tested and failed."

	<category: 'accessing'>
	^(self new)
	    failedPermission: aPermission;
	    signal
    ]

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'insecure operation in an untrusted context'
    ]

    failedPermission [
	"Answer the permission that was tested and that failed."

	<category: 'accessing'>
	^failedPermission
    ]

    failedPermission: anObject [
	"Set which permission was tested and failed."

	<category: 'accessing'>
	failedPermission := anObject
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: VerificationError [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when the verification of a method fails.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'a method did not pass the bytecode verification process'
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: BadReturn [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one tries to return from an already-terminated method.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'return from a dead method context'
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: UserInterrupt [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one presses Ctrl-C.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'interrupted!!!'
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: NoRunnableProcess [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when no runnable process can be found in the image.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'no runnable process'
    ]
]

]



Namespace current: SystemExceptions [

VMError subclass: PrimitiveFailed [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a primitive fails for some reason.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'primitive operation failed'
    ]
]

]



Namespace current: SystemExceptions [

PrimitiveFailed subclass: WrongArgumentCount [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when one tries to evaluate a method (via #perform:...) or a
block but passes the wrong number of arguments.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'wrong number of arguments'
    ]
]

]



Namespace current: SystemExceptions [

PrimitiveFailed subclass: CInterfaceError [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when an error happens that is related to the C interface.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'error in the C-language interface'
    ]
]

]



Namespace current: SystemExceptions [

PrimitiveFailed subclass: FileError [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when an error happens that is related to the file system.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'file system error'
    ]
]

]



Namespace current: SystemExceptions [

Error subclass: NotImplemented [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a method is called that has not been implemented.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'method is not implemented'
    ]
]

]



Namespace current: SystemExceptions [

NotImplemented subclass: NotYetImplemented [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a method is called that has not been implemented yet.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'not yet implemented'
    ]
]

]



Namespace current: SystemExceptions [

NotImplemented subclass: ShouldNotImplement [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a method is called that a class wishes that is not
called.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'should not be implemented in this class'
    ]
]

]



Namespace current: SystemExceptions [

ShouldNotImplement subclass: WrongMessageSent [
    | selector suggestedSelector |
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a method is called that a class wishes that is not
called.  This exception also includes a suggestion on which message
should be sent instead'>

    WrongMessageSent class >> signalOn: selector useInstead: aSymbol [
	"Raise an exception, signaling which selector was sent and suggesting
	 a valid alternative."

	<category: 'signaling'>
	^(self new)
	    selector: selector;
	    suggestedSelector: aSymbol;
	    signal
    ]

    messageText [
	"Answer an exception's message text."

	<category: 'accessing'>
	^'%1, use %2 instead' % 
		{self basicMessageText.
		self suggestedSelector storeString}
    ]

    selector [
	"Answer which selector was sent."

	<category: 'accessing'>
	^selector
    ]

    selector: aSymbol [
	"Set which selector was sent."

	<category: 'accessing'>
	selector := aSymbol
    ]

    suggestedSelector [
	"Answer a valid alternative to the selector that was used."

	<category: 'accessing'>
	^suggestedSelector
    ]

    suggestedSelector: aSymbol [
	"Set a valid alternative to the selector that was used."

	<category: 'accessing'>
	suggestedSelector := aSymbol
    ]
]

]



Namespace current: SystemExceptions [

ShouldNotImplement subclass: SubclassResponsibility [
    
    <category: 'Language-Exceptions'>
    <comment: 'I am raised when a method is called whose implementation is the responsibility
of concrete subclass.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'method is responsibility of a subclass'
    ]
]

]



Namespace current: SystemExceptions [

Exception subclass: UnhandledException [

    | originalException |

    <category: 'Language-Exception'>
    <comment: 'I am raised when a backtrace is shown to terminate the
current process.'>

    description [
	"Answer a textual description of the exception."

	<category: 'accessing'>
	^'an unhandled exception occurred in the current process'
    ]

    defaultAction [
	"Terminate the current process."

	<category: 'accessing'>
	| debugger debuggerClass context |
	Transcript flush.
	debugger := Processor activeDebugger.
	debugger isNil ifFalse: [^debugger stopInferior: self messageText ].
	debuggerClass := thisContext debuggerClass.
	debuggerClass isNil 
	    ifFalse: [^debuggerClass open: self originalException creator printString , ' error: ' , self messageText ].

	"Default behavior - print backtrace"
	RegressionTesting ifFalse: [self originalException creator basicPrint].
	Transcript
	    nextPutAll: ' error: ';
	    display: self messageText;
	    nl.
	RegressionTesting 
	    ifFalse: 
		[context := thisContext.
		[context isInternalExceptionHandlingContext] 
		    whileTrue: [context := context parentContext].
		context backtraceOn: Transcript].

	thisContext environment continue: nil
    ]

    instantiateDefaultHandler [
	"Private - Fill the receiver with information on its default handler."

	<category: 'private'>
        | signalingContext resumeContext |

	"This exception is kind of special, as we forcedly have to find
         a place to resume---even if the exception was not resumable!
         This typically will happens when the user steps out of the
         exception handling gobbledegook in the debugger."
        signalingContext := thisContext.
        [resumeContext := signalingContext parentContext.
        resumeContext isEnvironment not
            and: [resumeContext isInternalExceptionHandlingContext]]
                whileTrue: [signalingContext := resumeContext].

	self 
	    onDoBlock: nil
	    handlerBlock: [ :ex | ex defaultAction ]
	    onDoContext: signalingContext
	    previousState: nil
    ]

    originalException [
	"Answer the uncaught exception."

	<category: 'accessing'>
	^originalException
    ]

    originalException: anObject [
	"Set the uncaught exception to anObject."

	<category: 'accessing'>
	originalException := anObject
    ]
]

]



Namespace current: Kernel [

Notification subclass: TimeoutNotification [
    | delay |
    <category: 'Language-Implementation'>
    <comment: 'I get send by the timeout handling of a Delay
and I am the indication that the time is up and that one should come
to an end.'>

    TimeoutNotification class >> on: aDelay [
        <category: 'creation'>
        ^ self new
            delay: aDelay; yourself
    ]

    delay: aDelay [
        <category: 'private'>
        delay := aDelay
    ]

    delay [
        <category: 'private'>
        ^ delay
    ]

    isResumable [
        <category: 'private'>
        ^ false
    ]

    defaultAction [
	"We are not resumable, so do nothing.  This should really never happen."

	<category: 'exception description'>
    ]
]

]

Number extend [

    arithmeticError: msg [
	"Raise an ArithmeticError exception having msg as its message text."

	<category: 'error raising'>
	^ArithmeticError new signal: msg
    ]

    zeroDivide [
	"Raise a division-by-zero (ZeroDivide) exception whose dividend
	 is the receiver."

	<category: 'error raising'>
	^(ZeroDivide dividend: self) signal
    ]

]



Object extend [

    doesNotUnderstand: aMessage [
	"Called by the system when a selector was not found. message is a
	 Message containing information on the receiver"

	"aMessage inspect."

	"thisContext parentContext method inspect."

	"ObjectMemory abort."

	<category: 'error raising'>
	^(MessageNotUnderstood new)
	    message: aMessage receiver: self;
	    signal
    ]

    error: message [
	"Display a walkback for the receiver, with the given error message.
	 Signal an `Error' exception."

	<category: 'error raising'>
	^Error new signal: message
    ]

    halt: message [
	"Display a walkback for the receiver, with the given error message.
	 Signal an `Halt' exception."

	<category: 'error raising'>
	^Halt new signal: message
    ]

]



Eval [
    SystemExceptions.ProcessBeingTerminated initialize
]