43:
310:. If a module is found that defines that symbol it is linked together with the first object file, and any undefined external identifiers are added to the list of identifiers to be looked up. This process continues until all external references have been resolved. It is an error if one or more remains unresolved at the end of the process.
1187:
The symbol types in the SysV ABI (and nm's output) indicate the nature of each entry in the symbol table. Each symbol type is represented by a single character. For example, symbol table entries representing initialized data are denoted by the character "d" and symbol table entries for functions have
285:
As the lexical analyser spends a great proportion of its time looking up the symbol table, this activity has a crucial effect on the overall speed of the compiler. A symbol table must be organised in such a way that entries can be found as quickly as possible. Hash tables are usually used to organise
274:
a symbol "p" can be declared separately in several procedures, perhaps with different attributes. The scope of each declaration is the section of the program in which references to "p" resolve to that declaration. Each declaration represents a unique identifier "p". The symbol table must have some
282:. The time for searching in hash tables is independent of the number of elements stored in the table, so it is efficient for a large number of elements. It also simplifies the classification of literals in tabular format by including the classification in calculation of the hash key.
226:(IR) includes the symbol's name and its location or address. For a compiler targeting a platform with a concept of relocatability, it will also contain relocatability attributes (absolute, relocatable, etc.) and needed relocation information for relocatable symbols. Symbol tables for
1192:
section of an object file). Additionally, the capitalization of the symbol type indicates the type of linkage: lower-case letters indicate the symbol is local and upper-case indicates external (global) linkage.
230:
may store the symbol's type: string, integer, floating-point, etc., its size, and its dimensions and its bounds. Not all of this information is included in the output file, but may be provided for use in
239:
information is stored with or linked to the symbol table. Most compilers print some or all of this information in symbol table and cross-reference listings at the end of translation.
317:
an executable, many tools refer to the symbol table to check what addresses have been assigned to global variables and known functions. If the symbol table has been
1205:
programming language includes extensive support for creating and manipulating symbol tables. Properties that can be queried include whether a given symbol is a
1170:
are to be laid out in a binary file, so that different compilers, linkers and loaders can all consistently find and work with the symbols in a compiled object.
580:
In addition, the symbol table may also contain entries generated by the compiler for intermediate expression values (e.g., the expression that casts the
321:
or cleaned out before being converted into an executable, tools will find it harder to determine addresses or understand anything about the program.
199:
A symbol table may only exist in memory during the translation process, or it may be embedded in the output of the translation, such as in an
191:
or appearance in the source. In other words, the entries of a symbol table store the information related to the entry's corresponding symbol.
302:
will contain a symbol table of the identifiers it contains that are externally visible. During the linking of different object files, a
290:
are inevitable in a hash table, and a common way of handling them is to store the synonym in the next available free space in the table.
306:
will identify and resolve these symbol references. Usually all undefined external symbols will be searched for in one or more
1457:
1233:
Some programming languages allow the symbol table to be manipulated at run-time, so that symbols can be added at any time.
107:
79:
262:
A compiler may use one large symbol table for all symbols or use separated, or hierarchical symbol tables for different
255:
can all be used to implement a symbol table. The symbol table is accessed by most phases of a compiler, beginning with
188:
17:
126:
86:
1423:
227:
172:
164:
64:
93:
1245:
1234:
1202:
176:
60:
1484:
1163:
200:
223:
75:
1406:
1268:
330:
160:
53:
1357:
152:
1255:
programming language is essentially a symbol-table manipulation language; symbols are called
1248:
programming languages allow arbitrary, generic properties to be associated with each symbol.
484:
A C compiler that parses this code will contain at least the following symbol table entries:
211:
1174:
1167:
286:
a symbol table, where the keyword or identifier is 'hashed' to produce an array subscript.
252:
168:
31:
100:
8:
314:
307:
263:
1463:
303:
1394:
1453:
1467:
1445:
256:
140:
1382:
1441:
1321:
236:
1210:
1181:
287:
248:
148:
27:
Data structure used by a language translator such as a compiler or
Interpreter
1478:
1206:
222:
The minimum information contained in a symbol table used by a translator and
1449:
1280:
1218:
318:
1259:, and the relationships between symbols can be reasoned over. Similarly,
1285:
1214:
733:
299:
203:
184:
1184:
field, a "symbol type" field, and a symbol identifier (called "Name").
279:
180:
210:, or as a resource for formatting a diagnostic report during or after
1222:
1177:
232:
42:
1437:
207:
206:
for later use. For example, it might be used during an interactive
156:
1429:
1260:
1252:
1188:
the symbol type "t" (because executable code is located in the
278:
A common data structure used to implement symbol tables is the
251:
are available for implementing tables. Trees, linear lists and
1303:
1301:
1433:
267:
30:"Symbol (computing)" redirects here. For the data type, see
1338:
1298:
1241:
1160:
275:
means of differentiating references to the different "p"s.
271:
1422:
Copper, Keith D.; Torczon, Linda (18 January 2011).
1196:
67:. Unsourced material may be challenged and removed.
1228:
1159:An example of a symbol table can be found in the
1476:
588:, and the return value of the call to function
187:is associated with information relating to its
1421:
1344:
1307:
1263:provides a dynamic symbol table, called the
266:. For example, in a scoped language such as
401:// Sum all the values bar(1) to bar(count)
329:Consider the following program written in
127:Learn how and when to remove this message
1166:(ABI) specification, which mandates how
259:, and continuing through optimization.
14:
1477:
1319:
1180:utility. This format uses a sorted
595:
65:adding citations to reliable sources
36:
1221:, whether it is imported, and what
1173:The SysV ABI is implemented in the
592:), statement labels, and so forth.
24:
1237:is an example of such a language.
25:
1496:
242:
1197:Example: the Python symbol table
228:high-level programming languages
41:
1415:
338:// Declare an external function
293:
52:needs additional citations for
1399:
1387:
1375:
1350:
1313:
1229:Example: Dynamic symbol tables
235:. In many cases, the symbol's
217:
13:
1:
1291:
194:
1164:Application Binary Interface
7:
1274:
362:// Define a public function
224:intermediate representation
10:
1501:
324:
29:
1345:Copper & Torczon 2011
1308:Copper & Torczon 2011
1269:knowledge representation
601:Example table: SysV ABI
335:
1450:10.1016/C2009-0-27982-7
1425:Engineering a Compiler
900:AT91F_US_SetTimeguard
779:AT91F_SpuriousHandler
711:AT91F_US3_CfgPIO_useB
1320:Nguyen, Binh (2004).
878:AT91F_US_SetBaudrate
584:loop variable into a
253:self-organizing lists
1395:Racket Documentation
1383:Python documentation
1267:, which is used for
955:AT91F_PDC_SetNextRx
944:AT91F_PDC_SetNextTx
933:AT91F_PDC_DisableTx
922:AT91F_PDC_DisableRx
856:AT91F_PIO_CfgPeriph
722:AT91F_PIO_CfgPeriph
61:improve this article
32:Symbol (programming)
1485:Compiler structures
1407:Guile Documentation
999:AT91F_PDC_EnableTx
988:AT91F_PDC_EnableRx
867:AT91F_US_Configure
834:AT91F_LowLevelInit
823:AT91F_UndefHandler
602:
574:for-loop statement
548:function parameter
522:function parameter
315:reverse engineering
151:used by a language
1010:AT91F_US_EnableTx
889:AT91F_US_Baudrate
845:AT91F_DBGU_CfgPIO
746:AT91F_DBGU_Printk
600:
18:Symbol (computing)
1459:978-0-12-088478-0
1157:
1156:
1043:__aeabi_uidivmod
801:AT91F_FetchAbort
768:AT91F_US_PutChar
757:AT91F_US_TxReady
596:Example: SysV ABI
578:
577:
208:debugging session
137:
136:
129:
111:
16:(Redirected from
1492:
1471:
1409:
1403:
1397:
1391:
1385:
1379:
1373:
1372:
1370:
1368:
1354:
1348:
1342:
1336:
1335:
1333:
1331:
1323:Linux Dictionary
1317:
1311:
1305:
1213:, whether it is
977:AT91F_PDC_SetRx
966:AT91F_PDC_SetTx
790:AT91F_DataAbort
603:
599:
591:
587:
583:
568:
555:
542:
532:function, double
529:
516:
506:function, double
503:
487:
486:
480:
477:
474:
471:
468:
465:
462:
459:
456:
453:
450:
447:
444:
441:
438:
435:
432:
429:
426:
423:
420:
417:
414:
411:
408:
405:
402:
399:
396:
393:
390:
387:
384:
381:
378:
375:
372:
369:
366:
363:
360:
357:
354:
351:
348:
345:
342:
339:
308:object libraries
257:lexical analysis
141:computer science
132:
125:
121:
118:
112:
110:
69:
45:
37:
21:
1500:
1499:
1495:
1494:
1493:
1491:
1490:
1489:
1475:
1474:
1460:
1442:Rice University
1418:
1413:
1412:
1404:
1400:
1392:
1388:
1380:
1376:
1366:
1364:
1356:
1355:
1351:
1343:
1339:
1329:
1327:
1318:
1314:
1306:
1299:
1294:
1277:
1231:
1225:it belongs to.
1199:
911:AT91F_PDC_Open
598:
589:
585:
581:
566:
553:
540:
527:
514:
501:
482:
481:
478:
475:
472:
469:
466:
463:
460:
457:
454:
451:
448:
445:
442:
439:
436:
433:
430:
427:
424:
421:
418:
415:
412:
409:
406:
403:
400:
397:
394:
391:
388:
385:
382:
379:
376:
373:
370:
367:
364:
361:
358:
355:
352:
349:
346:
343:
340:
337:
327:
296:
249:data structures
245:
237:cross-reference
220:
197:
183:in a program's
133:
122:
116:
113:
70:
68:
58:
46:
35:
28:
23:
22:
15:
12:
11:
5:
1498:
1488:
1487:
1473:
1472:
1458:
1428:(2 ed.).
1417:
1414:
1411:
1410:
1398:
1386:
1374:
1362:sourceware.org
1349:
1347:, p. 254.
1337:
1326:. p. 1482
1312:
1310:, p. 253.
1296:
1295:
1293:
1290:
1289:
1288:
1283:
1276:
1273:
1230:
1227:
1211:bound variable
1198:
1195:
1182:memory address
1155:
1154:
1151:
1148:
1144:
1143:
1140:
1137:
1133:
1132:
1131:__bss_start__
1129:
1126:
1122:
1121:
1118:
1115:
1111:
1110:
1107:
1104:
1100:
1099:
1096:
1093:
1089:
1088:
1085:
1082:
1078:
1077:
1074:
1071:
1067:
1066:
1065:__aeabi_ldiv0
1063:
1060:
1056:
1055:
1054:__aeabi_idiv0
1052:
1049:
1045:
1044:
1041:
1038:
1034:
1033:
1030:
1027:
1023:
1022:
1021:__aeabi_uidiv
1019:
1016:
1012:
1011:
1008:
1005:
1001:
1000:
997:
994:
990:
989:
986:
983:
979:
978:
975:
972:
968:
967:
964:
961:
957:
956:
953:
950:
946:
945:
942:
939:
935:
934:
931:
928:
924:
923:
920:
917:
913:
912:
909:
906:
902:
901:
898:
895:
891:
890:
887:
884:
880:
879:
876:
873:
869:
868:
865:
862:
858:
857:
854:
851:
847:
846:
843:
840:
836:
835:
832:
829:
825:
824:
821:
818:
814:
813:
810:
807:
803:
802:
799:
796:
792:
791:
788:
785:
781:
780:
777:
774:
770:
769:
766:
763:
759:
758:
755:
752:
748:
747:
744:
741:
737:
736:
731:
728:
724:
723:
720:
717:
713:
712:
709:
706:
702:
701:
698:
695:
691:
690:
687:
684:
680:
679:
676:
673:
669:
668:
665:
662:
658:
657:
654:
651:
647:
646:
643:
640:
636:
635:
632:
629:
625:
624:
621:
618:
614:
613:
610:
607:
597:
594:
576:
575:
572:
569:
563:
562:
559:
556:
550:
549:
546:
543:
537:
536:
533:
530:
524:
523:
520:
517:
511:
510:
507:
504:
498:
497:
494:
491:
336:
326:
323:
295:
292:
244:
243:Implementation
241:
219:
216:
214:of a program.
196:
193:
149:data structure
135:
134:
76:"Symbol table"
49:
47:
40:
26:
9:
6:
4:
3:
2:
1497:
1486:
1483:
1482:
1480:
1469:
1465:
1461:
1455:
1451:
1447:
1443:
1439:
1435:
1431:
1427:
1426:
1420:
1419:
1408:
1402:
1396:
1390:
1384:
1378:
1363:
1359:
1353:
1346:
1341:
1325:
1324:
1316:
1309:
1304:
1302:
1297:
1287:
1284:
1282:
1279:
1278:
1272:
1270:
1266:
1262:
1258:
1254:
1249:
1247:
1243:
1238:
1236:
1226:
1224:
1220:
1216:
1212:
1208:
1207:free variable
1204:
1194:
1191:
1185:
1183:
1179:
1176:
1175:GNU binutils'
1171:
1169:
1165:
1162:
1152:
1149:
1146:
1145:
1141:
1138:
1135:
1134:
1130:
1127:
1124:
1123:
1119:
1116:
1113:
1112:
1108:
1105:
1102:
1101:
1097:
1094:
1091:
1090:
1086:
1083:
1080:
1079:
1075:
1072:
1069:
1068:
1064:
1061:
1058:
1057:
1053:
1050:
1047:
1046:
1042:
1039:
1036:
1035:
1031:
1028:
1025:
1024:
1020:
1017:
1014:
1013:
1009:
1006:
1003:
1002:
998:
995:
992:
991:
987:
984:
981:
980:
976:
973:
970:
969:
965:
962:
959:
958:
954:
951:
948:
947:
943:
940:
937:
936:
932:
929:
926:
925:
921:
918:
915:
914:
910:
907:
904:
903:
899:
896:
893:
892:
888:
885:
882:
881:
877:
874:
871:
870:
866:
863:
860:
859:
855:
852:
849:
848:
844:
841:
838:
837:
833:
830:
827:
826:
822:
819:
816:
815:
811:
808:
805:
804:
800:
797:
794:
793:
789:
786:
783:
782:
778:
775:
772:
771:
767:
764:
761:
760:
756:
753:
750:
749:
745:
742:
739:
738:
735:
732:
729:
726:
725:
721:
718:
715:
714:
710:
707:
704:
703:
699:
696:
693:
692:
688:
685:
682:
681:
677:
674:
671:
670:
666:
663:
660:
659:
655:
652:
649:
648:
644:
641:
638:
637:
633:
630:
627:
626:
622:
619:
616:
615:
611:
608:
605:
604:
593:
573:
570:
565:
564:
560:
557:
552:
551:
547:
544:
539:
538:
534:
531:
526:
525:
521:
518:
513:
512:
508:
505:
500:
499:
495:
492:
489:
488:
485:
334:
332:
322:
320:
316:
311:
309:
305:
301:
291:
289:
283:
281:
276:
273:
269:
265:
260:
258:
254:
250:
240:
238:
234:
229:
225:
215:
213:
209:
205:
202:
192:
190:
186:
182:
178:
174:
170:
166:
163:, where each
162:
158:
154:
150:
146:
142:
131:
128:
120:
117:November 2012
109:
106:
102:
99:
95:
92:
88:
85:
81:
78: –
77:
73:
72:Find sources:
66:
62:
56:
55:
50:This article
48:
44:
39:
38:
33:
19:
1424:
1416:Bibliography
1401:
1389:
1377:
1365:. Retrieved
1361:
1352:
1340:
1328:. Retrieved
1322:
1315:
1281:Debug symbol
1264:
1256:
1250:
1239:
1232:
1219:global scope
1200:
1189:
1186:
1172:
1158:
1120:__bss_start
1109:__bss_end__
812:AT91F_Undef
579:
561:block local
490:Symbol name
483:
328:
312:
297:
294:Applications
284:
277:
261:
246:
221:
198:
145:symbol table
144:
138:
123:
114:
104:
97:
90:
83:
71:
59:Please help
54:verification
51:
1381:symtable —
1286:.debug_info
1215:block scope
300:object file
218:Description
204:object file
189:declaration
185:source code
161:interpreter
1405:Symbols -
1393:Symbols -
1292:References
1032:__udivsi3
678:InitReset
288:Collisions
280:hash table
195:Background
165:identifier
155:such as a
153:translator
87:newspapers
1265:atomspace
1240:Both the
1223:namespace
247:Numerous
233:debugging
212:execution
177:procedure
1479:Category
1468:40425497
1438:Elsevier
1275:See also
1244:and the
1147:200009a4
1136:200009a4
1125:200009a4
1114:200009a4
1103:200009a4
1092:200009a0
1081:200009a0
1070:2000089c
1059:2000089c
1048:2000089c
1037:20000884
1026:20000788
1015:20000788
1004:2000075c
993:20000730
982:20000704
971:200006c0
960:2000067c
949:20000638
938:200005f4
927:200005c8
916:2000059c
905:2000051c
894:200004ec
883:2000041c
872:200003dc
861:20000360
850:2000030c
839:200002e0
828:20000284
817:20000268
806:2000024c
795:20000230
784:20000214
773:200001f8
762:200001c0
751:20000190
740:20000120
727:200000b0
716:2000005c
705:20000030
694:20000024
683:20000018
672:2000000c
661:20000008
650:20000004
639:00000080
628:00000040
617:00000020
319:stripped
181:function
173:constant
157:compiler
1430:Houston
1367:May 30,
1330:Apr 14,
1261:OpenCog
1168:symbols
1142:_edata
1098:_etext
1076:__div0
667:fiqvec
656:irqvec
606:Address
535:global
509:extern
325:Example
101:scholar
1466:
1456:
1253:Prolog
1246:Scheme
1235:Racket
1203:Python
1087:_data
689:_main
645:I_BIT
634:F_BIT
623:T_BIT
586:double
558:double
519:double
496:Scope
470:return
458:double
386:double
365:double
353:double
344:double
341:extern
313:While
304:linker
264:scopes
169:symbol
103:
96:
89:
82:
74:
1464:S2CID
1434:Texas
1257:atoms
1209:or a
1153:_end
612:Name
590:bar()
541:count
493:Type
431:count
428:<=
377:count
268:Algol
147:is a
108:JSTOR
94:books
1454:ISBN
1369:2020
1358:"nm"
1332:2018
1251:The
1242:LISP
1201:The
1190:text
1161:SysV
734:main
700:End
609:Type
272:PL/I
179:and
167:(or
143:, a
80:news
1446:doi
1217:or
571:int
554:sum
545:int
528:foo
502:bar
473:sum
452:bar
446:sum
410:int
404:for
395:0.0
389:sum
374:int
368:foo
347:bar
298:An
270:or
201:ABI
171:),
159:or
139:In
63:by
1481::
1462:.
1452:.
1444:.
1440:,
1436::
1432:,
1360:.
1300:^
1271:.
1178:nm
467:);
455:((
449:+=
440:++
359:);
333::
175:,
1470:.
1448::
1371:.
1334:.
1150:A
1139:A
1128:A
1117:A
1106:A
1095:A
1084:D
1073:T
1062:T
1051:T
1040:T
1029:T
1018:T
1007:t
996:t
985:t
974:t
963:t
952:t
941:t
930:t
919:t
908:t
897:t
886:t
875:t
864:t
853:t
842:t
831:T
820:T
809:T
798:T
787:T
776:T
765:t
754:t
743:T
730:T
719:t
708:T
697:t
686:T
675:t
664:t
653:t
642:a
631:a
620:a
582:i
567:i
515:x
479:}
476:;
464:i
461:)
443:)
437:i
434:;
425:i
422:;
419:1
416:=
413:i
407:(
398:;
392:=
383:{
380:)
371:(
356:x
350:(
331:C
130:)
124:(
119:)
115:(
105:·
98:·
91:·
84:·
57:.
34:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
