summaryrefslogtreecommitdiffstats
path: root/generic/tclObj.c
blob: 5c8ff479685ced4655f7ced81db8b21017cabb8f (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
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
/*
 * tclObj.c --
 *
 *	This file contains Tcl object-related functions that are used by many
 *	Tcl commands.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 1999 by Scriptics Corporation.
 * Copyright (c) 2001 by ActiveState Corporation.
 * Copyright (c) 2005 by Kevin B. Kenny.  All rights reserved.
 * Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tommath.h"
#include <math.h>

/*
 * Table of all object types.
 */

static Tcl_HashTable typeTable;
static int typeTableInitialized = 0;	/* 0 means not yet initialized. */
TCL_DECLARE_MUTEX(tableMutex)

/*
 * Head of the list of free Tcl_Obj structs we maintain.
 */

Tcl_Obj *tclFreeObjList = NULL;

/*
 * The object allocator is single threaded. This mutex is referenced by the
 * TclNewObj macro, however, so must be visible.
 */

#ifdef TCL_THREADS
MODULE_SCOPE Tcl_Mutex tclObjMutex;
Tcl_Mutex tclObjMutex;
#endif

/*
 * Pointer to a heap-allocated string of length zero that the Tcl core uses as
 * the value of an empty string representation for an object. This value is
 * shared by all new objects allocated by Tcl_NewObj.
 */

char tclEmptyString = '\0';
char *tclEmptyStringRep = &tclEmptyString;

#if defined(TCL_MEM_DEBUG) && defined(TCL_THREADS)
/*
 * Structure for tracking the source file and line number where a given
 * Tcl_Obj was allocated.  We also track the pointer to the Tcl_Obj itself,
 * for sanity checking purposes.
 */

typedef struct {
    Tcl_Obj *objPtr;		/* The pointer to the allocated Tcl_Obj. */
    const char *file;		/* The name of the source file calling this
				 * function; used for debugging. */
    int line;			/* Line number in the source file; used for
				 * debugging. */
} ObjData;
#endif /* TCL_MEM_DEBUG && TCL_THREADS */

/*
 * All static variables used in this file are collected into a single instance
 * of the following structure.  For multi-threaded implementations, there is
 * one instance of this structure for each thread.
 *
 * Notice that different structures with the same name appear in other files.
 * The structure defined below is used in this file only.
 */

typedef struct ThreadSpecificData {
    Tcl_HashTable *lineCLPtr;   /* This table remembers for each Tcl_Obj
                                 * generated by a call to the function
                                 * TclSubstTokens() from a literal text
                                 * where bs+nl sequences occured in it, if
                                 * any. I.e. this table keeps track of
                                 * invisible and stripped continuation lines.
                                 * Its keys are Tcl_Obj pointers, the values
                                 * are ContLineLoc pointers. See the file
                                 * tclCompile.h for the definition of this
                                 * structure, and for references to all
                                 * related places in the core. */
#if defined(TCL_MEM_DEBUG) && defined(TCL_THREADS)
    Tcl_HashTable *objThreadMap;/* Thread local table that is used to check
                                 * that a Tcl_Obj was not allocated by some
                                 * other thread. */
#endif /* TCL_MEM_DEBUG && TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

static void             ContLineLocFree(char *clientData);
static void             TclThreadFinalizeContLines(ClientData clientData);
static ThreadSpecificData *TclGetContLineTable(void);

/*
 * Nested Tcl_Obj deletion management support
 *
 * All context references used in the object freeing code are pointers to this
 * structure; every thread will have its own structure instance. The purpose
 * of this structure is to allow deeply nested collections of Tcl_Objs to be
 * freed without taking a vast depth of C stack (which could cause all sorts
 * of breakage.)
 */

typedef struct PendingObjData {
    int deletionCount;		/* Count of the number of invokations of
				 * TclFreeObj() are on the stack (at least
				 * conceptually; many are actually expanded
				 * macros). */
    Tcl_Obj *deletionStack;	/* Stack of objects that have had TclFreeObj()
				 * invoked upon them but which can't be
				 * deleted yet because they are in a nested
				 * invokation of TclFreeObj(). By postponing
				 * this way, we limit the maximum overall C
				 * stack depth when deleting a complex object.
				 * The down-side is that we alter the overall
				 * behaviour by altering the order in which
				 * objects are deleted, and we change the
				 * order in which the string rep and the
				 * internal rep of an object are deleted. Note
				 * that code which assumes the previous
				 * behaviour in either of these respects is
				 * unsafe anyway; it was never documented as
				 * to exactly what would happen in these
				 * cases, and the overall contract of a
				 * user-level Tcl_DecrRefCount() is still
				 * preserved (assuming that a particular T_DRC
				 * would delete an object is not very
				 * safe). */
} PendingObjData;

/*
 * These are separated out so that some semantic content is attached
 * to them.
 */
#define ObjDeletionLock(contextPtr)	((contextPtr)->deletionCount++)
#define ObjDeletionUnlock(contextPtr)	((contextPtr)->deletionCount--)
#define ObjDeletePending(contextPtr)	((contextPtr)->deletionCount > 0)
#define ObjOnStack(contextPtr)		((contextPtr)->deletionStack != NULL)
#define PushObjToDelete(contextPtr,objPtr) \
    /* The string rep is already invalidated so we can use the bytes value \
     * for our pointer chain: push onto the head of the stack. */       \
    (objPtr)->bytes = (char *) ((contextPtr)->deletionStack);           \
    (contextPtr)->deletionStack = (objPtr)
#define PopObjToDelete(contextPtr,objPtrVar) \
    (objPtrVar) = (contextPtr)->deletionStack;                          \
    (contextPtr)->deletionStack = (Tcl_Obj *) (objPtrVar)->bytes

/*
 * Macro to set up the local reference to the deletion context.
 */
#ifndef TCL_THREADS
static PendingObjData pendingObjData;
#define ObjInitDeletionContext(contextPtr) \
    PendingObjData *const contextPtr = &pendingObjData
#elif HAVE_FAST_TSD
static __thread PendingObjData pendingObjData;
#define ObjInitDeletionContext(contextPtr) \
    PendingObjData *const contextPtr = &pendingObjData
#else
static Tcl_ThreadDataKey pendingObjDataKey;
#define ObjInitDeletionContext(contextPtr) \
    PendingObjData *const contextPtr =                                  \
	    Tcl_GetThreadData(&pendingObjDataKey, sizeof(PendingObjData))
#endif

/*
 * Macros to pack/unpack a bignum's fields in a Tcl_Obj internal rep
 */

#define PACK_BIGNUM(bignum, objPtr) \
    if ((bignum).used > 0x7fff) {                                       \
	mp_int *temp = (void *) ckalloc((unsigned) sizeof(mp_int));     \
	*temp = bignum;                                                 \
	(objPtr)->internalRep.ptrAndLongRep.ptr = temp;                 \
	(objPtr)->internalRep.ptrAndLongRep.value = (unsigned long)(-1); \
    } else {                                                            \
	if ((bignum).alloc > 0x7fff) {                                  \
	    mp_shrink(&(bignum));                                       \
	}                                                               \
	(objPtr)->internalRep.ptrAndLongRep.ptr = (void *) (bignum).dp; \
	(objPtr)->internalRep.ptrAndLongRep.value = ( ((bignum).sign << 30) \
		| ((bignum).alloc << 15) | ((bignum).used));            \
    }

#define UNPACK_BIGNUM(objPtr, bignum) \
    if ((objPtr)->internalRep.ptrAndLongRep.value == (unsigned long)(-1)) { \
	(bignum) = *((mp_int *) ((objPtr)->internalRep.ptrAndLongRep.ptr)); \
    } else {                                                            \
	(bignum).dp = (objPtr)->internalRep.ptrAndLongRep.ptr;          \
	(bignum).sign = (objPtr)->internalRep.ptrAndLongRep.value >> 30; \
	(bignum).alloc =                                                \
		((objPtr)->internalRep.ptrAndLongRep.value >> 15) & 0x7fff; \
	(bignum).used = (objPtr)->internalRep.ptrAndLongRep.value & 0x7fff; \
    }

/*
 * Prototypes for functions defined later in this file:
 */

static int		ParseBoolean(Tcl_Obj *objPtr);
static int		SetDoubleFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static int		SetIntFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static void		UpdateStringOfDouble(Tcl_Obj *objPtr);
static void		UpdateStringOfInt(Tcl_Obj *objPtr);
#ifndef NO_WIDE_TYPE
static void		UpdateStringOfWideInt(Tcl_Obj *objPtr);
static int		SetWideIntFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
#endif
static void		FreeBignum(Tcl_Obj *objPtr);
static void		DupBignum(Tcl_Obj *objPtr, Tcl_Obj *copyPtr);
static void		UpdateStringOfBignum(Tcl_Obj *objPtr);
static int		GetBignumFromObj(Tcl_Interp *interp, Tcl_Obj *objPtr,
			    int copy, mp_int *bignumValue);

/*
 * Prototypes for the array hash key methods.
 */

static Tcl_HashEntry *	AllocObjEntry(Tcl_HashTable *tablePtr, void *keyPtr);

/*
 * Prototypes for the CommandName object type.
 */

static void		DupCmdNameInternalRep(Tcl_Obj *objPtr,
			    Tcl_Obj *copyPtr);
static void		FreeCmdNameInternalRep(Tcl_Obj *objPtr);
static int		SetCmdNameFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);

/*
 * The structures below defines the Tcl object types defined in this file by
 * means of functions that can be invoked by generic object code. See also
 * tclStringObj.c, tclListObj.c, tclByteCode.c for other type manager
 * implementations.
 */

static const Tcl_ObjType oldBooleanType = {
    "boolean",			/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    NULL,			/* updateStringProc */
    TclSetBooleanFromAny		/* setFromAnyProc */
};
const Tcl_ObjType tclBooleanType = {
    "booleanString",		/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    NULL,			/* updateStringProc */
    TclSetBooleanFromAny		/* setFromAnyProc */
};
const Tcl_ObjType tclDoubleType = {
    "double",			/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    UpdateStringOfDouble,	/* updateStringProc */
    SetDoubleFromAny		/* setFromAnyProc */
};
const Tcl_ObjType tclIntType = {
    "int",			/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    UpdateStringOfInt,		/* updateStringProc */
    SetIntFromAny		/* setFromAnyProc */
};
#ifndef NO_WIDE_TYPE
const Tcl_ObjType tclWideIntType = {
    "wideInt",			/* name */
    NULL,			/* freeIntRepProc */
    NULL,			/* dupIntRepProc */
    UpdateStringOfWideInt,	/* updateStringProc */
    SetWideIntFromAny		/* setFromAnyProc */
};
#endif
const Tcl_ObjType tclBignumType = {
    "bignum",			/* name */
    FreeBignum,			/* freeIntRepProc */
    DupBignum,			/* dupIntRepProc */
    UpdateStringOfBignum,	/* updateStringProc */
    NULL			/* setFromAnyProc */
};

/*
 * The structure below defines the Tcl obj hash key type.
 */

const Tcl_HashKeyType tclObjHashKeyType = {
    TCL_HASH_KEY_TYPE_VERSION,	/* version */
    0,				/* flags */
    TclHashObjKey,		/* hashKeyProc */
    TclCompareObjKeys,		/* compareKeysProc */
    AllocObjEntry,		/* allocEntryProc */
    TclFreeObjEntry		/* freeEntryProc */
};

/*
 * The structure below defines the command name Tcl object type by means of
 * functions that can be invoked by generic object code. Objects of this type
 * cache the Command pointer that results from looking up command names in the
 * command hashtable. Such objects appear as the zeroth ("command name")
 * argument in a Tcl command.
 *
 * NOTE: the ResolvedCmdName that gets cached is stored in the
 * twoPtrValue.ptr1 field, and the twoPtrValue.ptr2 field is unused. You might
 * think you could use the simpler otherValuePtr field to store the single
 * ResolvedCmdName pointer, but DO NOT DO THIS. It seems that some extensions
 * use the second internal pointer field of the twoPtrValue field for their
 * own purposes.
 *
 * TRICKY POINT! Some extensions update this structure! (Notably, these
 * include TclBlend and TCom). This is highly ill-advised on their part, but
 * does allow them to delete a command when references to it are gone, which
 * is fragile but useful given their somewhat-OO style. Because of this, this
 * structure MUST NOT be const so that the C compiler puts the data in
 * writable memory. [Bug 2558422]
 * TODO: Provide a better API for those extensions so that they can coexist...
 */

Tcl_ObjType tclCmdNameType = {
    "cmdName",			/* name */
    FreeCmdNameInternalRep,	/* freeIntRepProc */
    DupCmdNameInternalRep,	/* dupIntRepProc */
    NULL,			/* updateStringProc */
    SetCmdNameFromAny		/* setFromAnyProc */
};

/*
 * Structure containing a cached pointer to a command that is the result of
 * resolving the command's name in some namespace. It is the internal
 * representation for a cmdName object. It contains the pointer along with
 * some information that is used to check the pointer's validity.
 */

typedef struct ResolvedCmdName {
    Command *cmdPtr;		/* A cached Command pointer. */
    Namespace *refNsPtr;	/* Points to the namespace containing the
				 * reference (not the namespace that contains
				 * the referenced command). NULL if the name
				 * is fully qualified.*/
    long refNsId;		/* refNsPtr's unique namespace id. Used to
				 * verify that refNsPtr is still valid (e.g.,
				 * it's possible that the cmd's containing
				 * namespace was deleted and a new one created
				 * at the same address). */
    int refNsCmdEpoch;		/* Value of the referencing namespace's
				 * cmdRefEpoch when the pointer was cached.
				 * Before using the cached pointer, we check
				 * if the namespace's epoch was incremented;
				 * if so, this cached pointer is invalid. */
    int cmdEpoch;		/* Value of the command's cmdEpoch when this
				 * pointer was cached. Before using the cached
				 * pointer, we check if the cmd's epoch was
				 * incremented; if so, the cmd was renamed,
				 * deleted, hidden, or exposed, and so the
				 * pointer is invalid. */
    int refCount;		/* Reference count: 1 for each cmdName object
				 * that has a pointer to this ResolvedCmdName
				 * structure as its internal rep. This
				 * structure can be freed when refCount
				 * becomes zero. */
} ResolvedCmdName;

/*
 *-------------------------------------------------------------------------
 *
 * TclInitObjectSubsystem --
 *
 *	This function is invoked to perform once-only initialization of the
 *	type table. It also registers the object types defined in this file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Initializes the table of defined object types "typeTable" with builtin
 *	object types defined in this file.
 *
 *-------------------------------------------------------------------------
 */

void
TclInitObjSubsystem(void)
{
    Tcl_MutexLock(&tableMutex);
    typeTableInitialized = 1;
    Tcl_InitHashTable(&typeTable, TCL_STRING_KEYS);
    Tcl_MutexUnlock(&tableMutex);

    Tcl_RegisterObjType(&tclByteArrayType);
    Tcl_RegisterObjType(&tclDoubleType);
    Tcl_RegisterObjType(&tclEndOffsetType);
    Tcl_RegisterObjType(&tclIntType);
    Tcl_RegisterObjType(&tclStringType);
    Tcl_RegisterObjType(&tclListType);
    Tcl_RegisterObjType(&tclDictType);
    Tcl_RegisterObjType(&tclByteCodeType);
    Tcl_RegisterObjType(&tclArraySearchType);
    Tcl_RegisterObjType(&tclCmdNameType);
    Tcl_RegisterObjType(&tclRegexpType);
    Tcl_RegisterObjType(&tclProcBodyType);

    /* For backward compatibility only ... */
    Tcl_RegisterObjType(&oldBooleanType);
#ifndef NO_WIDE_TYPE
    Tcl_RegisterObjType(&tclWideIntType);
#endif

#ifdef TCL_COMPILE_STATS
    Tcl_MutexLock(&tclObjMutex);
    tclObjsAlloced = 0;
    tclObjsFreed = 0;
    {
	int i;

	for (i=0 ; i<TCL_MAX_SHARED_OBJ_STATS ; i++) {
	    tclObjsShared[i] = 0;
	}
    }
    Tcl_MutexUnlock(&tclObjMutex);
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeThreadObjects --
 *
 *	This function is called by Tcl_FinalizeThread to clean up thread
 *	specific Tcl_Obj information.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeThreadObjects(void)
{
#if defined(TCL_MEM_DEBUG) && defined(TCL_THREADS)
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch hSearch;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    Tcl_HashTable *tablePtr = tsdPtr->objThreadMap;

    if (tablePtr != NULL) {
	for (hPtr = Tcl_FirstHashEntry(tablePtr, &hSearch);
		hPtr != NULL; hPtr = Tcl_NextHashEntry(&hSearch)) {
	    ObjData *objData = Tcl_GetHashValue(hPtr);

	    if (objData != NULL) {
		ckfree(objData);
	    }
	}

	Tcl_DeleteHashTable(tablePtr);
	ckfree(tablePtr);
	tsdPtr->objThreadMap = NULL;
    }
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeObjects --
 *
 *	This function is called by Tcl_Finalize to clean up all registered
 *	Tcl_ObjType's and to reset the tclFreeObjList.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeObjects(void)
{
    Tcl_MutexLock(&tableMutex);
    if (typeTableInitialized) {
	Tcl_DeleteHashTable(&typeTable);
	typeTableInitialized = 0;
    }
    Tcl_MutexUnlock(&tableMutex);

    /*
     * All we do here is reset the head pointer of the linked list of free
     * Tcl_Obj's to NULL; the memory finalization will take care of releasing
     * memory for us.
     */
    Tcl_MutexLock(&tclObjMutex);
    tclFreeObjList = NULL;
    Tcl_MutexUnlock(&tclObjMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetContLineTable --
 *
 *	This procedure is a helper which returns the thread-specific
 *	hash-table used to track continuation line information associated with
 *	Tcl_Obj*, and the objThreadMap, etc.
 *
 * Results:
 *	A reference to the thread-data.
 *
 * Side effects:
 *	May allocate memory for the thread-data.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

static ThreadSpecificData *
TclGetContLineTable(void)
{
    /*
     * Initialize the hashtable tracking invisible continuation lines.  For
     * the release we use a thread exit handler to ensure that this is done
     * before TSD blocks are made invalid. The TclFinalizeObjects() which
     * would be the natural place for this is invoked afterwards, meaning that
     * we try to operate on a data structure already gone.
     */

    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (!tsdPtr->lineCLPtr) {
	tsdPtr->lineCLPtr = ckalloc(sizeof(Tcl_HashTable));
	Tcl_InitHashTable(tsdPtr->lineCLPtr, TCL_ONE_WORD_KEYS);
	Tcl_CreateThreadExitHandler(TclThreadFinalizeContLines,NULL);
    }
    return tsdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclContinuationsEnter --
 *
 *	This procedure is a helper which saves the continuation line
 *	information associated with a Tcl_Obj*.
 *
 * Results:
 *	A reference to the newly created continuation line location table.
 *
 * Side effects:
 *	Allocates memory for the table of continuation line locations.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

ContLineLoc *
TclContinuationsEnter(
    Tcl_Obj *objPtr,
    int num,
    int *loc)
{
    int newEntry;
    ThreadSpecificData *tsdPtr = TclGetContLineTable();
    Tcl_HashEntry *hPtr =
	    Tcl_CreateHashEntry(tsdPtr->lineCLPtr, objPtr, &newEntry);
    ContLineLoc *clLocPtr = ckalloc(sizeof(ContLineLoc) + num*sizeof(int));

    if (!newEntry) {
	/*
	 * We're entering ContLineLoc data for the same value more than one
	 * time. Taking care not to leak the old entry.
	 *
	 * This can happen when literals in a proc body are shared. See for
	 * example test info-30.19 where the action (code) for all branches of
	 * the switch command is identical, mapping them all to the same
	 * literal. An interesting result of this is that the number and
	 * locations (offset) of invisible continuation lines in the literal
	 * are the same for all occurences.
	 *
	 * Note that while reusing the existing entry is possible it requires
	 * the same actions as for a new entry because we have to copy the
	 * incoming num/loc data even so. Because we are called from
	 * TclContinuationsEnterDerived for this case, which modified the
	 * stored locations (Rebased to the proper relative offset). Just
	 * returning the stored entry would rebase them a second time, or
	 * more, hosing the data. It is easier to simply replace, as we are
	 * doing.
	 */

	ckfree(Tcl_GetHashValue(hPtr));
    }

    clLocPtr->num = num;
    memcpy(&clLocPtr->loc, loc, num*sizeof(int));
    clLocPtr->loc[num] = CLL_END;       /* Sentinel */
    Tcl_SetHashValue(hPtr, clLocPtr);

    return clLocPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclContinuationsEnterDerived --
 *
 *	This procedure is a helper which computes the continuation line
 *	information associated with a Tcl_Obj* cut from the middle of a
 *	script.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocates memory for the table of continuation line locations.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclContinuationsEnterDerived(
    Tcl_Obj *objPtr,
    int start,
    int *clNext)
{
    int length, end, num;
    int *wordCLLast = clNext;

    /*
     * We have to handle invisible continuations lines here as well, despite
     * the code we have in TclSubstTokens (TST) for that. Why ?  Nesting. If
     * our script is the sole argument to an 'eval' command, for example, the
     * scriptCLLocPtr we are using was generated by a previous call to TST,
     * and while the words we have here may contain continuation lines they
     * are invisible already, and the inner call to TST had no bs+nl sequences
     * to trigger its code.
     *
     * Luckily for us, the table we have to create here for the current word
     * has to be a slice of the table currently in use, with the locations
     * suitably modified to be relative to the start of the word instead of
     * relative to the script.
     *
     * That is what we are doing now. Determine the slice we need, and if not
     * empty, wrap it into a new table, and save the result into our
     * thread-global hashtable, as usual.
     */

    /*
     * First compute the range of the word within the script. (Is there a
     * better way which doesn't shimmer?)
     */

    Tcl_GetStringFromObj(objPtr, &length);
    end = start + length;       /* First char after the word */

    /*
     * Then compute the table slice covering the range of the word.
     */

    while (*wordCLLast >= 0 && *wordCLLast < end) {
	wordCLLast++;
    }

    /*
     * And generate the table from the slice, if it was not empty.
     */

    num = wordCLLast - clNext;
    if (num) {
	int i;
	ContLineLoc *clLocPtr = TclContinuationsEnter(objPtr, num, clNext);

	/*
	 * Re-base the locations.
	 */

	for (i=0 ; i<num ; i++) {
	    clLocPtr->loc[i] -= start;

	    /*
	     * Continuation lines coming before the string and affecting us
	     * should not happen, due to the proper maintenance of clNext
	     * during compilation.
	     */

	    if (clLocPtr->loc[i] < 0) {
		Tcl_Panic("Derived ICL data for object using offsets from before the script");
	    }
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclContinuationsCopy --
 *
 *	This procedure is a helper which copies the continuation line
 *	information associated with a Tcl_Obj* to another Tcl_Obj*. It is
 *	assumed that both contain the same string/script. Use this when a
 *	script is duplicated because it was shared.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocates memory for the table of continuation line locations.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclContinuationsCopy(
    Tcl_Obj *objPtr,
    Tcl_Obj *originObjPtr)
{
    ThreadSpecificData *tsdPtr = TclGetContLineTable();
    Tcl_HashEntry *hPtr =
            Tcl_FindHashEntry(tsdPtr->lineCLPtr, originObjPtr);

    if (hPtr) {
	ContLineLoc *clLocPtr = Tcl_GetHashValue(hPtr);

	TclContinuationsEnter(objPtr, clLocPtr->num, clLocPtr->loc);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclContinuationsGet --
 *
 *	This procedure is a helper which retrieves the continuation line
 *	information associated with a Tcl_Obj*, if it has any.
 *
 * Results:
 *	A reference to the continuation line location table, or NULL if the
 *	Tcl_Obj* has no such information associated with it.
 *
 * Side effects:
 *	None.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

ContLineLoc *
TclContinuationsGet(
    Tcl_Obj *objPtr)
{
    ThreadSpecificData *tsdPtr = TclGetContLineTable();
    Tcl_HashEntry *hPtr =
            Tcl_FindHashEntry(tsdPtr->lineCLPtr, objPtr);

    if (!hPtr) {
        return NULL;
    }
    return Tcl_GetHashValue(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclThreadFinalizeContLines --
 *
 *	This procedure is a helper which releases all continuation line
 *	information currently known. It is run as a thread exit handler.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Releases memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

static void
TclThreadFinalizeContLines(
    ClientData clientData)
{
    /*
     * Release the hashtable tracking invisible continuation lines.
     */

    ThreadSpecificData *tsdPtr = TclGetContLineTable();
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch hSearch;

    for (hPtr = Tcl_FirstHashEntry(tsdPtr->lineCLPtr, &hSearch);
	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&hSearch)) {
	/*
	 * We are not using Tcl_EventuallyFree (as in TclFreeObj()) because
	 * here we can be sure that the compiler will not hold references to
	 * the data in the hashtable, and using TEF might bork the
	 * finalization sequence.
	 */

	ContLineLocFree(Tcl_GetHashValue(hPtr));
	Tcl_DeleteHashEntry(hPtr);
    }
    Tcl_DeleteHashTable(tsdPtr->lineCLPtr);
    ckfree(tsdPtr->lineCLPtr);
    tsdPtr->lineCLPtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * ContLineLocFree --
 *
 *	The freProc for continuation line location tables.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Releases memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

static void
ContLineLocFree(
    char *clientData)
{
    ckfree(clientData);
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_RegisterObjType --
 *
 *	This function is called to register a new Tcl object type in the table
 *	of all object types supported by Tcl.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The type is registered in the Tcl type table. If there was already a
 *	type with the same name as in typePtr, it is replaced with the new
 *	type.
 *
 *--------------------------------------------------------------
 */

void
Tcl_RegisterObjType(
    const Tcl_ObjType *typePtr)	/* Information about object type; storage must
				 * be statically allocated (must live
				 * forever). */
{
    int isNew;

    Tcl_MutexLock(&tableMutex);
    Tcl_SetHashValue(
	    Tcl_CreateHashEntry(&typeTable, typePtr->name, &isNew), typePtr);
    Tcl_MutexUnlock(&tableMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AppendAllObjTypes --
 *
 *	This function appends onto the argument object the name of each object
 *	type as a list element. This includes the builtin object types (e.g.
 *	int, list) as well as those added using Tcl_NewObj. These names can be
 *	used, for example, with Tcl_GetObjType to get pointers to the
 *	corresponding Tcl_ObjType structures.
 *
 * Results:
 *	The return value is normally TCL_OK; in this case the object
 *	referenced by objPtr has each type name appended to it. If an error
 *	occurs, TCL_ERROR is returned and the interpreter's result holds an
 *	error message.
 *
 * Side effects:
 *	If necessary, the object referenced by objPtr is converted into a list
 *	object.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_AppendAllObjTypes(
    Tcl_Interp *interp,		/* Interpreter used for error reporting. */
    Tcl_Obj *objPtr)		/* Points to the Tcl object onto which the
				 * name of each registered type is appended as
				 * a list element. */
{
    register Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    int numElems;

    /*
     * Get the test for a valid list out of the way first.
     */

    if (TclListObjLength(interp, objPtr, &numElems) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Type names are NUL-terminated, not counted strings. This code relies on
     * that.
     */

    Tcl_MutexLock(&tableMutex);
    for (hPtr = Tcl_FirstHashEntry(&typeTable, &search);
	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
	Tcl_ListObjAppendElement(NULL, objPtr,
		Tcl_NewStringObj(Tcl_GetHashKey(&typeTable, hPtr), -1));
    }
    Tcl_MutexUnlock(&tableMutex);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetObjType --
 *
 *	This function looks up an object type by name.
 *
 * Results:
 *	If an object type with name matching "typeName" is found, a pointer to
 *	its Tcl_ObjType structure is returned; otherwise, NULL is returned.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

const Tcl_ObjType *
Tcl_GetObjType(
    const char *typeName)	/* Name of Tcl object type to look up. */
{
    register Tcl_HashEntry *hPtr;
    const Tcl_ObjType *typePtr = NULL;

    Tcl_MutexLock(&tableMutex);
    hPtr = Tcl_FindHashEntry(&typeTable, typeName);
    if (hPtr != NULL) {
	typePtr = Tcl_GetHashValue(hPtr);
    }
    Tcl_MutexUnlock(&tableMutex);
    return typePtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ConvertToType --
 *
 *	Convert the Tcl object "objPtr" to have type "typePtr" if possible.
 *
 * Results:
 *	The return value is TCL_OK on success and TCL_ERROR on failure. If
 *	TCL_ERROR is returned, then the interpreter's result contains an error
 *	message unless "interp" is NULL. Passing a NULL "interp" allows this
 *	function to be used as a test whether the conversion could be done
 *	(and in fact was done).
 *
 * Side effects:
 *	Any internal representation for the old type is freed.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_ConvertToType(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr,		/* The object to convert. */
    const Tcl_ObjType *typePtr)	/* The target type. */
{
    if (objPtr->typePtr == typePtr) {
	return TCL_OK;
    }

    /*
     * Use the target type's Tcl_SetFromAnyProc to set "objPtr"s internal form
     * as appropriate for the target type. This frees the old internal
     * representation.
     */

    if (typePtr->setFromAnyProc == NULL) {
	Tcl_Panic("may not convert object to type %s", typePtr->name);
    }

    return typePtr->setFromAnyProc(interp, objPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TclDbDumpActiveObjects --
 *
 *	This function is called to dump all of the active Tcl_Obj structs this
 *	allocator knows about.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

void
TclDbDumpActiveObjects(
    FILE *outFile)
{
#if defined(TCL_MEM_DEBUG) && defined(TCL_THREADS)
    Tcl_HashSearch hSearch;
    Tcl_HashEntry *hPtr;
    Tcl_HashTable *tablePtr;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    tablePtr = tsdPtr->objThreadMap;

    if (tablePtr != NULL) {
	fprintf(outFile, "total objects: %d\n", tablePtr->numEntries);
	for (hPtr = Tcl_FirstHashEntry(tablePtr, &hSearch); hPtr != NULL;
		hPtr = Tcl_NextHashEntry(&hSearch)) {
	    ObjData *objData = Tcl_GetHashValue(hPtr);

	    if (objData != NULL) {
		fprintf(outFile,
			"key = 0x%p, objPtr = 0x%p, file = %s, line = %d\n",
			Tcl_GetHashKey(tablePtr, hPtr), objData->objPtr,
			objData->file, objData->line);
	    } else {
		fprintf(outFile, "key = 0x%p\n",
			Tcl_GetHashKey(tablePtr, hPtr));
	    }
	}
    }
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TclDbInitNewObj --
 *
 *	Called via the TclNewObj or TclDbNewObj macros when TCL_MEM_DEBUG is
 *	enabled. This function will initialize the members of a Tcl_Obj
 *	struct. Initilization would be done inline via the TclNewObj macro
 *	when compiling without TCL_MEM_DEBUG.
 *
 * Results:
 *	The Tcl_Obj struct members are initialized.
 *
 * Side effects:
 *	None.
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
void
TclDbInitNewObj(
    register Tcl_Obj *objPtr,
    register const char *file,	/* The name of the source file calling this
				 * function; used for debugging. */
    register int line)		/* Line number in the source file; used for
				 * debugging. */
{
    objPtr->refCount = 0;
    objPtr->bytes = tclEmptyStringRep;
    objPtr->length = 0;
    objPtr->typePtr = NULL;

#ifdef TCL_THREADS
    /*
     * Add entry to a thread local map used to check if a Tcl_Obj was
     * allocated by the currently executing thread.
     */

    if (!TclInExit()) {
	Tcl_HashEntry *hPtr;
	Tcl_HashTable *tablePtr;
	int isNew;
	ObjData *objData;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	if (tsdPtr->objThreadMap == NULL) {
	    tsdPtr->objThreadMap = ckalloc(sizeof(Tcl_HashTable));
	    Tcl_InitHashTable(tsdPtr->objThreadMap, TCL_ONE_WORD_KEYS);
	}
	tablePtr = tsdPtr->objThreadMap;
	hPtr = Tcl_CreateHashEntry(tablePtr, objPtr, &isNew);
	if (!isNew) {
	    Tcl_Panic("expected to create new entry for object map");
	}

	/*
	 * Record the debugging information.
	 */

	objData = ckalloc(sizeof(ObjData));
	objData->objPtr = objPtr;
	objData->file = file;
	objData->line = line;
	Tcl_SetHashValue(hPtr, objData);
    }
#endif /* TCL_THREADS */
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewObj --
 *
 *	This function is normally called when not debugging: i.e., when
 *	TCL_MEM_DEBUG is not defined. It creates new Tcl objects that denote
 *	the empty string. These objects have a NULL object type and NULL
 *	string representation byte pointer. Type managers call this routine to
 *	allocate new objects that they further initialize.
 *
 *	When TCL_MEM_DEBUG is defined, this function just returns the result
 *	of calling the debugging version Tcl_DbNewObj.
 *
 * Results:
 *	The result is a newly allocated object that represents the empty
 *	string. The new object's typePtr is set NULL and its ref count is set
 *	to 0.
 *
 * Side effects:
 *	If compiling with TCL_COMPILE_STATS, this function increments the
 *	global count of allocated objects (tclObjsAlloced).
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewObj

Tcl_Obj *
Tcl_NewObj(void)
{
    return Tcl_DbNewObj("unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewObj(void)
{
    register Tcl_Obj *objPtr;

    /*
     * Use the macro defined in tclInt.h - it will use the correct allocator.
     */

    TclNewObj(objPtr);
    return objPtr;
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewObj --
 *
 *	This function is normally called when debugging: i.e., when
 *	TCL_MEM_DEBUG is defined. It creates new Tcl objects that denote the
 *	empty string. It is the same as the Tcl_NewObj function above except
 *	that it calls Tcl_DbCkalloc directly with the file name and line
 *	number from its caller. This simplifies debugging since then the
 *	[memory active] command will report the correct file name and line
 *	number when reporting objects that haven't been freed.
 *
 *	When TCL_MEM_DEBUG is not defined, this function just returns the
 *	result of calling Tcl_NewObj.
 *
 * Results:
 *	The result is a newly allocated that represents the empty string. The
 *	new object's typePtr is set NULL and its ref count is set to 0.
 *
 * Side effects:
 *	If compiling with TCL_COMPILE_STATS, this function increments the
 *	global count of allocated objects (tclObjsAlloced).
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewObj(
    register const char *file,	/* The name of the source file calling this
				 * function; used for debugging. */
    register int line)		/* Line number in the source file; used for
				 * debugging. */
{
    register Tcl_Obj *objPtr;

    /*
     * Use the macro defined in tclInt.h - it will use the correct allocator.
     */

    TclDbNewObj(objPtr, file, line);
    return objPtr;
}
#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewObj(
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    return Tcl_NewObj();
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * TclAllocateFreeObjects --
 *
 *	Function to allocate a number of free Tcl_Objs. This is done using a
 *	single ckalloc to reduce the overhead for Tcl_Obj allocation.
 *
 *	Assumes mutex is held.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	tclFreeObjList, the head of the list of free Tcl_Objs, is set to the
 *	first of a number of free Tcl_Obj's linked together by their
 *	internalRep.twoPtrValue.ptr1's.
 *
 *----------------------------------------------------------------------
 */

#define OBJS_TO_ALLOC_EACH_TIME 100

void
TclAllocateFreeObjects(void)
{
    size_t bytesToAlloc = (OBJS_TO_ALLOC_EACH_TIME * sizeof(Tcl_Obj));
    char *basePtr;
    register Tcl_Obj *prevPtr, *objPtr;
    register int i;

    /*
     * This has been noted by Purify to be a potential leak. The problem is
     * that Tcl, when not TCL_MEM_DEBUG compiled, keeps around all allocated
     * Tcl_Obj's, pointed to by tclFreeObjList, when freed instead of actually
     * freeing the memory. TclFinalizeObjects() does not ckfree() this memory,
     * but leaves it to Tcl's memory subsystem finalization to release it.
     * Purify apparently can't figure that out, and fires a false alarm.
     */

    basePtr = ckalloc(bytesToAlloc);

    prevPtr = NULL;
    objPtr = (Tcl_Obj *) basePtr;
    for (i = 0; i < OBJS_TO_ALLOC_EACH_TIME; i++) {
	objPtr->internalRep.twoPtrValue.ptr1 = prevPtr;
	prevPtr = objPtr;
	objPtr++;
    }
    tclFreeObjList = prevPtr;
}
#undef OBJS_TO_ALLOC_EACH_TIME

/*
 *----------------------------------------------------------------------
 *
 * TclFreeObj --
 *
 *	This function frees the memory associated with the argument object.
 *	It is called by the tcl.h macro Tcl_DecrRefCount when an object's ref
 *	count is zero. It is only "public" since it must be callable by that
 *	macro wherever the macro is used. It should not be directly called by
 *	clients.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deallocates the storage for the object's Tcl_Obj structure after
 *	deallocating the string representation and calling the type-specific
 *	Tcl_FreeInternalRepProc to deallocate the object's internal
 *	representation. If compiling with TCL_COMPILE_STATS, this function
 *	increments the global count of freed objects (tclObjsFreed).
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
void
TclFreeObj(
    register Tcl_Obj *objPtr)	/* The object to be freed. */
{
    register const Tcl_ObjType *typePtr = objPtr->typePtr;

    /*
     * This macro declares a variable, so must come here...
     */

    ObjInitDeletionContext(context);

    if (objPtr->refCount < -1) {
	Tcl_Panic("Reference count for %p was negative", objPtr);
    }

    /*
     * Invalidate the string rep first so we can use the bytes value for our
     * pointer chain, and signal an obj deletion (as opposed to shimmering)
     * with 'length == -1'.
     */

    TclInvalidateStringRep(objPtr);
    objPtr->length = -1;

    if (ObjDeletePending(context)) {
	PushObjToDelete(context, objPtr);
    } else {
	TCL_DTRACE_OBJ_FREE(objPtr);
	if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
	    ObjDeletionLock(context);
	    typePtr->freeIntRepProc(objPtr);
	    ObjDeletionUnlock(context);
	}

	Tcl_MutexLock(&tclObjMutex);
	ckfree(objPtr);
	Tcl_MutexUnlock(&tclObjMutex);
	TclIncrObjsFreed();
	ObjDeletionLock(context);
	while (ObjOnStack(context)) {
	    Tcl_Obj *objToFree;

	    PopObjToDelete(context, objToFree);
	    TCL_DTRACE_OBJ_FREE(objToFree);
	    TclFreeIntRep(objToFree);

	    Tcl_MutexLock(&tclObjMutex);
	    ckfree(objToFree);
	    Tcl_MutexUnlock(&tclObjMutex);
	    TclIncrObjsFreed();
	}
	ObjDeletionUnlock(context);
    }

    /*
     * We cannot use TclGetContinuationTable() here, because that may
     * re-initialize the thread-data for calls coming after the finalization.
     * We have to access it using the low-level call and then check for
     * validity. This function can be called after TclFinalizeThreadData() has
     * already killed the thread-global data structures. Performing
     * TCL_TSD_INIT will leave us with an un-initialized memory block upon
     * which we crash (if we where to access the uninitialized hashtable).
     */

    {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
        Tcl_HashEntry *hPtr;

	if (tsdPtr->lineCLPtr) {
            hPtr = Tcl_FindHashEntry(tsdPtr->lineCLPtr, objPtr);
	    if (hPtr) {
		Tcl_EventuallyFree(Tcl_GetHashValue(hPtr), ContLineLocFree);
		Tcl_DeleteHashEntry(hPtr);
	    }
	}
    }
}
#else /* TCL_MEM_DEBUG */

void
TclFreeObj(
    register Tcl_Obj *objPtr)	/* The object to be freed. */
{
    /*
     * Invalidate the string rep first so we can use the bytes value for our
     * pointer chain, and signal an obj deletion (as opposed to shimmering)
     * with 'length == -1'.
     */

    TclInvalidateStringRep(objPtr);
    objPtr->length = -1;

    if (!objPtr->typePtr || !objPtr->typePtr->freeIntRepProc) {
	/*
	 * objPtr can be freed safely, as it will not attempt to free any
	 * other objects: it will not cause recursive calls to this function.
	 */

	TCL_DTRACE_OBJ_FREE(objPtr);
	TclFreeObjStorage(objPtr);
	TclIncrObjsFreed();
    } else {
	/*
	 * This macro declares a variable, so must come here...
	 */

	ObjInitDeletionContext(context);

	if (ObjDeletePending(context)) {
	    PushObjToDelete(context, objPtr);
	} else {
	    /*
	     * Note that the contents of the while loop assume that the string
	     * rep has already been freed and we don't want to do anything
	     * fancy with adding to the queue inside ourselves. Must take care
	     * to unstack the object first since freeing the internal rep can
	     * add further objects to the stack. The code assumes that it is
	     * the first thing in a block; all current usages in the core
	     * satisfy this.
	     */

	    TCL_DTRACE_OBJ_FREE(objPtr);
	    ObjDeletionLock(context);
	    objPtr->typePtr->freeIntRepProc(objPtr);
	    ObjDeletionUnlock(context);

	    TclFreeObjStorage(objPtr);
	    TclIncrObjsFreed();
	    ObjDeletionLock(context);
	    while (ObjOnStack(context)) {
		Tcl_Obj *objToFree;

		PopObjToDelete(context, objToFree);
		TCL_DTRACE_OBJ_FREE(objToFree);
		if ((objToFree->typePtr != NULL)
			&& (objToFree->typePtr->freeIntRepProc != NULL)) {
		    objToFree->typePtr->freeIntRepProc(objToFree);
		}
		TclFreeObjStorage(objToFree);
		TclIncrObjsFreed();
	    }
	    ObjDeletionUnlock(context);
	}
    }

    /*
     * We cannot use TclGetContinuationTable() here, because that may
     * re-initialize the thread-data for calls coming after the finalization.
     * We have to access it using the low-level call and then check for
     * validity. This function can be called after TclFinalizeThreadData() has
     * already killed the thread-global data structures. Performing
     * TCL_TSD_INIT will leave us with an un-initialized memory block upon
     * which we crash (if we where to access the uninitialized hashtable).
     */

    {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
        Tcl_HashEntry *hPtr;

	if (tsdPtr->lineCLPtr) {
            hPtr = Tcl_FindHashEntry(tsdPtr->lineCLPtr, objPtr);
	    if (hPtr) {
		Tcl_EventuallyFree(Tcl_GetHashValue(hPtr), ContLineLocFree);
		Tcl_DeleteHashEntry(hPtr);
	    }
	}
    }
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * TclObjBeingDeleted --
 *
 *	This function returns 1 when the Tcl_Obj is being deleted. It is
 *	provided for the rare cases where the reason for the loss of an
 *	internal rep might be relevant. [FR 1512138]
 *
 * Results:
 *	1 if being deleted, 0 otherwise.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclObjBeingDeleted(
    Tcl_Obj *objPtr)
{
    return (objPtr->length == -1);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DuplicateObj --
 *
 *	Create and return a new object that is a duplicate of the argument
 *	object.
 *
 * Results:
 *	The return value is a pointer to a newly created Tcl_Obj. This object
 *	has reference count 0 and the same type, if any, as the source object
 *	objPtr. Also:
 *	  1) If the source object has a valid string rep, we copy it;
 *	     otherwise, the duplicate's string rep is set NULL to mark it
 *	     invalid.
 *	  2) If the source object has an internal representation (i.e. its
 *	     typePtr is non-NULL), the new object's internal rep is set to a
 *	     copy; otherwise the new internal rep is marked invalid.
 *
 * Side effects:
 *	What constitutes "copying" the internal representation depends on the
 *	type. For example, if the argument object is a list, the element
 *	objects it points to will not actually be copied but will be shared
 *	with the duplicate list. That is, the ref counts of the element
 *	objects will be incremented.
 *
 *----------------------------------------------------------------------
 */

#define SetDuplicateObj(dupPtr, objPtr)					\
    {									\
	const Tcl_ObjType *typePtr = (objPtr)->typePtr;			\
	const char *bytes = (objPtr)->bytes;				\
	if (bytes) {							\
	    TclInitStringRep((dupPtr), bytes, (objPtr)->length);	\
	} else {							\
	    (dupPtr)->bytes = NULL;					\
	}								\
	if (typePtr) {							\
	    if (typePtr->dupIntRepProc) {				\
		typePtr->dupIntRepProc((objPtr), (dupPtr));		\
	    } else {							\
		(dupPtr)->internalRep = (objPtr)->internalRep;		\
		(dupPtr)->typePtr = typePtr;				\
	    }								\
	}								\
    }

Tcl_Obj *
Tcl_DuplicateObj(
    Tcl_Obj *objPtr)		/* The object to duplicate. */
{
    Tcl_Obj *dupPtr;

    TclNewObj(dupPtr);
    SetDuplicateObj(dupPtr, objPtr);
    return dupPtr;
}

void
TclSetDuplicateObj(
    Tcl_Obj *dupPtr,
    Tcl_Obj *objPtr)
{
    if (Tcl_IsShared(dupPtr)) {
	Tcl_Panic("%s called with shared object", "TclSetDuplicateObj");
    }
    TclInvalidateStringRep(dupPtr);
    TclFreeIntRep(dupPtr);
    SetDuplicateObj(dupPtr, objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetString --
 *
 *	Returns the string representation byte array pointer for an object.
 *
 * Results:
 *	Returns a pointer to the string representation of objPtr. The byte
 *	array referenced by the returned pointer must not be modified by the
 *	caller. Furthermore, the caller must copy the bytes if they need to
 *	retain them since the object's string rep can change as a result of
 *	other operations.
 *
 * Side effects:
 *	May call the object's updateStringProc to update the string
 *	representation from the internal representation.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_GetString(
    register Tcl_Obj *objPtr)	/* Object whose string rep byte pointer should
				 * be returned. */
{
    if (objPtr->bytes != NULL) {
	return objPtr->bytes;
    }

    /*
     * Note we do not check for objPtr->typePtr == NULL.  An invariant of
     * a properly maintained Tcl_Obj is that at least  one of objPtr->bytes
     * and objPtr->typePtr must not be NULL.  If broken extensions fail to
     * maintain that invariant, we can crash here.
     */

    if (objPtr->typePtr->updateStringProc == NULL) {
	/*
	 * Those Tcl_ObjTypes which choose not to define an updateStringProc
	 * must be written in such a way that (objPtr->bytes) never becomes
	 * NULL.  This panic was added in Tcl 8.1.
	 */

	Tcl_Panic("UpdateStringProc should not be invoked for type %s",
		objPtr->typePtr->name);
    }
    objPtr->typePtr->updateStringProc(objPtr);
    if (objPtr->bytes == NULL || objPtr->length < 0
	    || objPtr->bytes[objPtr->length] != '\0') {
	Tcl_Panic("UpdateStringProc for type '%s' "
		"failed to create a valid string rep", objPtr->typePtr->name);
    }
    return objPtr->bytes;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetStringFromObj --
 *
 *	Returns the string representation's byte array pointer and length for
 *	an object.
 *
 * Results:
 *	Returns a pointer to the string representation of objPtr. If lengthPtr
 *	isn't NULL, the length of the string representation is stored at
 *	*lengthPtr. The byte array referenced by the returned pointer must not
 *	be modified by the caller. Furthermore, the caller must copy the bytes
 *	if they need to retain them since the object's string rep can change
 *	as a result of other operations.
 *
 * Side effects:
 *	May call the object's updateStringProc to update the string
 *	representation from the internal representation.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_GetStringFromObj(
    register Tcl_Obj *objPtr,	/* Object whose string rep byte pointer should
				 * be returned. */
    register int *lengthPtr)	/* If non-NULL, the location where the string
				 * rep's byte array length should * be stored.
				 * If NULL, no length is stored. */
{
    (void) TclGetString(objPtr);

    if (lengthPtr != NULL) {
	*lengthPtr = objPtr->length;
    }
    return objPtr->bytes;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InvalidateStringRep --
 *
 *	This function is called to invalidate an object's string
 *	representation.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deallocates the storage for any old string representation, then sets
 *	the string representation NULL to mark it invalid.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_InvalidateStringRep(
    register Tcl_Obj *objPtr)	/* Object whose string rep byte pointer should
				 * be freed. */
{
    TclInvalidateStringRep(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetBooleanFromObj --
 *
 *	Attempt to return a boolean from the Tcl object "objPtr". This
 *	includes conversion from any of Tcl's numeric types.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	The intrep of *objPtr may be changed.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetBooleanFromObj(
    Tcl_Interp *interp,         /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr,	/* The object from which to get boolean. */
    register int *boolPtr)	/* Place to store resulting boolean. */
{
    do {
	if (objPtr->typePtr == &tclIntType) {
	    *boolPtr = (objPtr->internalRep.longValue != 0);
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclBooleanType) {
	    *boolPtr = (int) objPtr->internalRep.longValue;
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclDoubleType) {
	    /*
	     * Caution: Don't be tempted to check directly for the "double"
	     * Tcl_ObjType and then compare the intrep to 0.0. This isn't
	     * reliable because a "double" Tcl_ObjType can hold the NaN value.
	     * Use the API Tcl_GetDoubleFromObj, which does the checking and
	     * sets the proper error message for us.
	     */

	    double d;

	    if (Tcl_GetDoubleFromObj(interp, objPtr, &d) != TCL_OK) {
		return TCL_ERROR;
	    }
	    *boolPtr = (d != 0.0);
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclBignumType) {
	    *boolPtr = 1;
	    return TCL_OK;
	}
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    *boolPtr = (objPtr->internalRep.wideValue != 0);
	    return TCL_OK;
	}
#endif
    } while ((ParseBoolean(objPtr) == TCL_OK) || (TCL_OK ==
	    TclParseNumber(interp, objPtr, "boolean value", NULL,-1,NULL,0)));
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * TclSetBooleanFromAny --
 *
 *	Attempt to generate a boolean internal form for the Tcl object
 *	"objPtr".
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs during
 *	conversion, an error message is left in the interpreter's result
 *	unless "interp" is NULL.
 *
 * Side effects:
 *	If no error occurs, an integer 1 or 0 is stored as "objPtr"s internal
 *	representation and the type of "objPtr" is set to boolean.
 *
 *----------------------------------------------------------------------
 */

int
TclSetBooleanFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr)	/* The object to convert. */
{
    /*
     * For some "pure" numeric Tcl_ObjTypes (no string rep), we can determine
     * whether a boolean conversion is possible without generating the string
     * rep.
     */

    if (objPtr->bytes == NULL) {
	if (objPtr->typePtr == &tclIntType) {
	    switch (objPtr->internalRep.longValue) {
	    case 0L: case 1L:
		return TCL_OK;
	    }
	    goto badBoolean;
	}

	if (objPtr->typePtr == &tclBignumType) {
	    goto badBoolean;
	}

#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    goto badBoolean;
	}
#endif

	if (objPtr->typePtr == &tclDoubleType) {
	    goto badBoolean;
	}
    }

    if (ParseBoolean(objPtr) == TCL_OK) {
	return TCL_OK;
    }

  badBoolean:
    if (interp != NULL) {
	int length;
	const char *str = Tcl_GetStringFromObj(objPtr, &length);
	Tcl_Obj *msg;

	TclNewLiteralStringObj(msg, "expected boolean value but got \"");
	Tcl_AppendLimitedToObj(msg, str, length, 50, "");
	Tcl_AppendToObj(msg, "\"", -1);
	Tcl_SetObjResult(interp, msg);
	Tcl_SetErrorCode(interp, "TCL", "VALUE", "BOOLEAN", NULL);
    }
    return TCL_ERROR;
}

static int
ParseBoolean(
    register Tcl_Obj *objPtr)	/* The object to parse/convert. */
{
    int i, length, newBool;
    char lowerCase[6];
    const char *str = TclGetStringFromObj(objPtr, &length);

    if ((length == 0) || (length > 5)) {
	/*
         * Longest valid boolean string rep. is "false".
         */

	return TCL_ERROR;
    }

    switch (str[0]) {
    case '0':
	if (length == 1) {
	    newBool = 0;
	    goto numericBoolean;
	}
	return TCL_ERROR;
    case '1':
	if (length == 1) {
	    newBool = 1;
	    goto numericBoolean;
	}
	return TCL_ERROR;
    }

    /*
     * Force to lower case for case-insensitive detection. Filter out known
     * invalid characters at the same time.
     */

    for (i=0; i < length; i++) {
	char c = str[i];

	switch (c) {
	case 'A': case 'E': case 'F': case 'L': case 'N':
	case 'O': case 'R': case 'S': case 'T': case 'U': case 'Y':
	    lowerCase[i] = c + (char) ('a' - 'A');
	    break;
	case 'a': case 'e': case 'f': case 'l': case 'n':
	case 'o': case 'r': case 's': case 't': case 'u': case 'y':
	    lowerCase[i] = c;
	    break;
	default:
	    return TCL_ERROR;
	}
    }
    lowerCase[length] = 0;
    switch (lowerCase[0]) {
    case 'y':
	/*
	 * Checking the 'y' is redundant, but makes the code clearer.
	 */
	if (strncmp(lowerCase, "yes", (size_t) length) == 0) {
	    newBool = 1;
	    goto goodBoolean;
	}
	return TCL_ERROR;
    case 'n':
	if (strncmp(lowerCase, "no", (size_t) length) == 0) {
	    newBool = 0;
	    goto goodBoolean;
	}
	return TCL_ERROR;
    case 't':
	if (strncmp(lowerCase, "true", (size_t) length) == 0) {
	    newBool = 1;
	    goto goodBoolean;
	}
	return TCL_ERROR;
    case 'f':
	if (strncmp(lowerCase, "false", (size_t) length) == 0) {
	    newBool = 0;
	    goto goodBoolean;
	}
	return TCL_ERROR;
    case 'o':
	if (length < 2) {
	    return TCL_ERROR;
	}
	if (strncmp(lowerCase, "on", (size_t) length) == 0) {
	    newBool = 1;
	    goto goodBoolean;
	} else if (strncmp(lowerCase, "off", (size_t) length) == 0) {
	    newBool = 0;
	    goto goodBoolean;
	}
	return TCL_ERROR;
    default:
	return TCL_ERROR;
    }

    /*
     * Free the old internalRep before setting the new one. We do this as late
     * as possible to allow the conversion code, in particular
     * Tcl_GetStringFromObj, to use that old internalRep.
     */

  goodBoolean:
    TclFreeIntRep(objPtr);
    objPtr->internalRep.longValue = newBool;
    objPtr->typePtr = &tclBooleanType;
    return TCL_OK;

  numericBoolean:
    TclFreeIntRep(objPtr);
    objPtr->internalRep.longValue = newBool;
    objPtr->typePtr = &tclIntType;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewDoubleObj --
 *
 *	This function is normally called when not debugging: i.e., when
 *	TCL_MEM_DEBUG is not defined. It creates a new double object and
 *	initializes it from the argument double value.
 *
 *	When TCL_MEM_DEBUG is defined, this function just returns the result
 *	of calling the debugging version Tcl_DbNewDoubleObj.
 *
 * Results:
 *	The newly created object is returned. This object will have an
 *	invalid string representation. The returned object has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewDoubleObj

Tcl_Obj *
Tcl_NewDoubleObj(
    register double dblValue)	/* Double used to initialize the object. */
{
    return Tcl_DbNewDoubleObj(dblValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewDoubleObj(
    register double dblValue)	/* Double used to initialize the object. */
{
    register Tcl_Obj *objPtr;

    TclNewDoubleObj(objPtr, dblValue);
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewDoubleObj --
 *
 *	This function is normally called when debugging: i.e., when
 *	TCL_MEM_DEBUG is defined. It creates new double objects. It is the
 *	same as the Tcl_NewDoubleObj function above except that it calls
 *	Tcl_DbCkalloc directly with the file name and line number from its
 *	caller. This simplifies debugging since then the [memory active]
 *	command will report the correct file name and line number when
 *	reporting objects that haven't been freed.
 *
 *	When TCL_MEM_DEBUG is not defined, this function just returns the
 *	result of calling Tcl_NewDoubleObj.
 *
 * Results:
 *	The newly created object is returned. This object will have an invalid
 *	string representation. The returned object has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewDoubleObj(
    register double dblValue,	/* Double used to initialize the object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;

    objPtr->internalRep.doubleValue = dblValue;
    objPtr->typePtr = &tclDoubleType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewDoubleObj(
    register double dblValue,	/* Double used to initialize the object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    return Tcl_NewDoubleObj(dblValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetDoubleObj --
 *
 *	Modify an object to be a double object and to have the specified
 *	double value.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's old string rep, if any, is freed. Also, any old internal
 *	rep is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetDoubleObj(
    register Tcl_Obj *objPtr,	/* Object whose internal rep to init. */
    register double dblValue)	/* Double used to set the object's value. */
{
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetDoubleObj");
    }

    TclSetDoubleObj(objPtr, dblValue);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetDoubleFromObj --
 *
 *	Attempt to return a double from the Tcl object "objPtr". If the object
 *	is not already a double, an attempt will be made to convert it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already a double, the conversion will free any
 *	old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetDoubleFromObj(
    Tcl_Interp *interp,         /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr,	/* The object from which to get a double. */
    register double *dblPtr)	/* Place to store resulting double. */
{
    do {
	if (objPtr->typePtr == &tclDoubleType) {
	    if (TclIsNaN(objPtr->internalRep.doubleValue)) {
		if (interp != NULL) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "floating point value is Not a Number", -1));
                    Tcl_SetErrorCode(interp, "TCL", "VALUE", "DOUBLE", "NAN",
                            NULL);
		}
		return TCL_ERROR;
	    }
	    *dblPtr = (double) objPtr->internalRep.doubleValue;
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclIntType) {
	    *dblPtr = objPtr->internalRep.longValue;
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclBignumType) {
	    mp_int big;

	    UNPACK_BIGNUM(objPtr, big);
	    *dblPtr = TclBignumToDouble(&big);
	    return TCL_OK;
	}
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    *dblPtr = (double) objPtr->internalRep.wideValue;
	    return TCL_OK;
	}
#endif
    } while (SetDoubleFromAny(interp, objPtr) == TCL_OK);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * SetDoubleFromAny --
 *
 *	Attempt to generate an double-precision floating point internal form
 *	for the Tcl object "objPtr".
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If no error occurs, a double is stored as "objPtr"s internal
 *	representation.
 *
 *----------------------------------------------------------------------
 */

static int
SetDoubleFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr)	/* The object to convert. */
{
    return TclParseNumber(interp, objPtr, "floating-point number", NULL, -1,
	    NULL, 0);
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfDouble --
 *
 *	Update the string representation for a double-precision floating point
 *	object. This must obey the current tcl_precision value for
 *	double-to-string conversions. Note: This function does not free an
 *	existing old string rep so storage will be lost if this has not
 *	already been done.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to a valid string that results from the
 *	double-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfDouble(
    register Tcl_Obj *objPtr)	/* Double obj with string rep to update. */
{
    char buffer[TCL_DOUBLE_SPACE];
    register int len;

    Tcl_PrintDouble(NULL, objPtr->internalRep.doubleValue, buffer);
    len = strlen(buffer);

    objPtr->bytes = ckalloc(len + 1);
    memcpy(objPtr->bytes, buffer, (unsigned) len + 1);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetIntFromObj --
 *
 *	Attempt to return an int from the Tcl object "objPtr". If the object
 *	is not already an int, an attempt will be made to convert it to one.
 *
 *	Integer and long integer objects share the same "integer" type
 *	implementation. We store all integers as longs and Tcl_GetIntFromObj
 *	checks whether the current value of the long can be represented by an
 *	int.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion or if the long integer held by the object can not be
 *	represented by an int, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already an int, the conversion will free any old
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetIntFromObj(
    Tcl_Interp *interp,         /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr,	/* The object from which to get a int. */
    register int *intPtr)	/* Place to store resulting int. */
{
#if (LONG_MAX == INT_MAX)
    return TclGetLongFromObj(interp, objPtr, (long *) intPtr);
#else
    long l;

    if (TclGetLongFromObj(interp, objPtr, &l) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((ULONG_MAX > UINT_MAX) && ((l > UINT_MAX) || (l < -(long)UINT_MAX))) {
	if (interp != NULL) {
	    const char *s =
		    "integer value too large to represent as non-long integer";
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(s, -1));
	    Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, NULL);
	}
	return TCL_ERROR;
    }
    *intPtr = (int) l;
    return TCL_OK;
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * SetIntFromAny --
 *
 *	Attempts to force the internal representation for a Tcl object to
 *	tclIntType, specifically.
 *
 * Results:
 *	The return value is a standard object Tcl result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 *----------------------------------------------------------------------
 */

static int
SetIntFromAny(
    Tcl_Interp *interp,		/* Tcl interpreter */
    Tcl_Obj *objPtr)		/* Pointer to the object to convert */
{
    long l;

    return TclGetLongFromObj(interp, objPtr, &l);
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfInt --
 *
 *	Update the string representation for an integer object. Note: This
 *	function does not free an existing old string rep so storage will be
 *	lost if this has not already been done.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to a valid string that results from the
 *	int-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfInt(
    register Tcl_Obj *objPtr)	/* Int object whose string rep to update. */
{
    char buffer[TCL_INTEGER_SPACE];
    register int len;

    len = TclFormatInt(buffer, objPtr->internalRep.longValue);

    objPtr->bytes = ckalloc(len + 1);
    memcpy(objPtr->bytes, buffer, (unsigned) len + 1);
    objPtr->length = len;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewLongObj --
 *
 *	If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *	Tcl_NewLongObj to create a new long integer object end up calling the
 *	debugging function Tcl_DbNewLongObj instead.
 *
 *	Otherwise, if the client is compiled without TCL_MEM_DEBUG defined,
 *	calls to Tcl_NewLongObj result in a call to one of the two
 *	Tcl_NewLongObj implementations below. We provide two implementations
 *	so that the Tcl core can be compiled to do memory debugging of the
 *	core even if a client does not request it for itself.
 *
 *	Integer and long integer objects share the same "integer" type
 *	implementation. We store all integers as longs and Tcl_GetIntFromObj
 *	checks whether the current value of the long can be represented by an
 *	int.
 *
 * Results:
 *	The newly created object is returned. This object will have an invalid
 *	string representation. The returned object has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewLongObj

Tcl_Obj *
Tcl_NewLongObj(
    register long longValue)	/* Long integer used to initialize the
				 * new object. */
{
    return Tcl_DbNewLongObj(longValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewLongObj(
    register long longValue)	/* Long integer used to initialize the
				 * new object. */
{
    register Tcl_Obj *objPtr;

    TclNewLongObj(objPtr, longValue);
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewLongObj --
 *
 *	If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *	Tcl_NewIntObj and Tcl_NewLongObj to create new integer or long integer
 *	objects end up calling the debugging function Tcl_DbNewLongObj
 *	instead. We provide two implementations of Tcl_DbNewLongObj so that
 *	whether the Tcl core is compiled to do memory debugging of the core is
 *	independent of whether a client requests debugging for itself.
 *
 *	When the core is compiled with TCL_MEM_DEBUG defined, Tcl_DbNewLongObj
 *	calls Tcl_DbCkalloc directly with the file name and line number from
 *	its caller. This simplifies debugging since then the [memory active]
 *	command will report the caller's file name and line number when
 *	reporting objects that haven't been freed.
 *
 *	Otherwise, when the core is compiled without TCL_MEM_DEBUG defined,
 *	this function just returns the result of calling Tcl_NewLongObj.
 *
 * Results:
 *	The newly created long integer object is returned. This object will
 *	have an invalid string representation. The returned object has ref
 *	count 0.
 *
 * Side effects:
 *	Allocates memory.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewLongObj(
    register long longValue,	/* Long integer used to initialize the new
				 * object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    objPtr->bytes = NULL;

    objPtr->internalRep.longValue = longValue;
    objPtr->typePtr = &tclIntType;
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewLongObj(
    register long longValue,	/* Long integer used to initialize the new
				 * object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    return Tcl_NewLongObj(longValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetLongObj --
 *
 *	Modify an object to be an integer object and to have the specified
 *	long integer value.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's old string rep, if any, is freed. Also, any old internal
 *	rep is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetLongObj(
    register Tcl_Obj *objPtr,	/* Object whose internal rep to init. */
    register long longValue)	/* Long integer used to initialize the
				 * object's value. */
{
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetLongObj");
    }

    TclSetLongObj(objPtr, longValue);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetLongFromObj --
 *
 *	Attempt to return an long integer from the Tcl object "objPtr". If the
 *	object is not already an int object, an attempt will be made to
 *	convert it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already an int object, the conversion will free
 *	any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetLongFromObj(
    Tcl_Interp *interp,         /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr,	/* The object from which to get a long. */
    register long *longPtr)	/* Place to store resulting long. */
{
    do {
	if (objPtr->typePtr == &tclIntType) {
	    *longPtr = objPtr->internalRep.longValue;
	    return TCL_OK;
	}
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    /*
	     * We return any integer in the range -ULONG_MAX to ULONG_MAX
	     * converted to a long, ignoring overflow. The rule preserves
	     * existing semantics for conversion of integers on input, but
	     * avoids inadvertent demotion of wide integers to 32-bit ones in
	     * the internal rep.
	     */

	    Tcl_WideInt w = objPtr->internalRep.wideValue;

	    if (w >= -(Tcl_WideInt)(ULONG_MAX)
		    && w <= (Tcl_WideInt)(ULONG_MAX)) {
		*longPtr = Tcl_WideAsLong(w);
		return TCL_OK;
	    }
	    goto tooLarge;
	}
#endif
	if (objPtr->typePtr == &tclDoubleType) {
	    if (interp != NULL) {
                Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "expected integer but got \"%s\"",
                        Tcl_GetString(objPtr)));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "INTEGER", NULL);
	    }
	    return TCL_ERROR;
	}
	if (objPtr->typePtr == &tclBignumType) {
	    /*
	     * Must check for those bignum values that can fit in a long, even
	     * when auto-narrowing is enabled. Only those values in the signed
	     * long range get auto-narrowed to tclIntType, while all the
	     * values in the unsigned long range will fit in a long.
	     */

	    mp_int big;

	    UNPACK_BIGNUM(objPtr, big);
	    if ((size_t) big.used <= (CHAR_BIT * sizeof(long) + DIGIT_BIT - 1)
		    / DIGIT_BIT) {
		unsigned long value = 0, numBytes = sizeof(long);
		long scratch;
		unsigned char *bytes = (unsigned char *) &scratch;

		if (mp_to_unsigned_bin_n(&big, bytes, &numBytes) == MP_OKAY) {
		    while (numBytes-- > 0) {
			value = (value << CHAR_BIT) | *bytes++;
		    }
		    if (big.sign) {
			*longPtr = - (long) value;
		    } else {
			*longPtr = (long) value;
		    }
		    return TCL_OK;
		}
	    }
#ifndef NO_WIDE_TYPE
	tooLarge:
#endif
	    if (interp != NULL) {
		const char *s = "integer value too large to represent";
		Tcl_Obj *msg = Tcl_NewStringObj(s, -1);

		Tcl_SetObjResult(interp, msg);
		Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, NULL);
	    }
	    return TCL_ERROR;
	}
    } while (TclParseNumber(interp, objPtr, "integer", NULL, -1, NULL,
	    TCL_PARSE_INTEGER_ONLY)==TCL_OK);
    return TCL_ERROR;
}
#ifndef NO_WIDE_TYPE

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfWideInt --
 *
 *	Update the string representation for a wide integer object. Note: this
 *	function does not free an existing old string rep so storage will be
 *	lost if this has not already been done.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to a valid string that results from the
 *	wideInt-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfWideInt(
    register Tcl_Obj *objPtr)	/* Int object whose string rep to update. */
{
    char buffer[TCL_INTEGER_SPACE+2];
    register unsigned len;
    register Tcl_WideInt wideVal = objPtr->internalRep.wideValue;

    /*
     * Note that sprintf will generate a compiler warning under Mingw claiming
     * %I64 is an unknown format specifier. Just ignore this warning. We can't
     * use %L as the format specifier since that gets printed as a 32 bit
     * value.
     */

    sprintf(buffer, "%" TCL_LL_MODIFIER "d", wideVal);
    len = strlen(buffer);
    objPtr->bytes = ckalloc(len + 1);
    memcpy(objPtr->bytes, buffer, len + 1);
    objPtr->length = len;
}
#endif /* !NO_WIDE_TYPE */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewWideIntObj --
 *
 *	If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *	Tcl_NewWideIntObj to create a new 64-bit integer object end up calling
 *	the debugging function Tcl_DbNewWideIntObj instead.
 *
 *	Otherwise, if the client is compiled without TCL_MEM_DEBUG defined,
 *	calls to Tcl_NewWideIntObj result in a call to one of the two
 *	Tcl_NewWideIntObj implementations below. We provide two
 *	implementations so that the Tcl core can be compiled to do memory
 *	debugging of the core even if a client does not request it for itself.
 *
 * Results:
 *	The newly created object is returned. This object will have an invalid
 *	string representation. The returned object has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewWideIntObj

Tcl_Obj *
Tcl_NewWideIntObj(
    register Tcl_WideInt wideValue)
				/* Wide integer used to initialize the new
				 * object. */
{
    return Tcl_DbNewWideIntObj(wideValue, "unknown", 0);
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_NewWideIntObj(
    register Tcl_WideInt wideValue)
				/* Wide integer used to initialize the new
				 * object. */
{
    register Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    Tcl_SetWideIntObj(objPtr, wideValue);
    return objPtr;
}
#endif /* if TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewWideIntObj --
 *
 *	If a client is compiled with TCL_MEM_DEBUG defined, calls to
 *	Tcl_NewWideIntObj to create new wide integer end up calling the
 *	debugging function Tcl_DbNewWideIntObj instead. We provide two
 *	implementations of Tcl_DbNewWideIntObj so that whether the Tcl core is
 *	compiled to do memory debugging of the core is independent of whether
 *	a client requests debugging for itself.
 *
 *	When the core is compiled with TCL_MEM_DEBUG defined,
 *	Tcl_DbNewWideIntObj calls Tcl_DbCkalloc directly with the file name
 *	and line number from its caller. This simplifies debugging since then
 *	the checkmem command will report the caller's file name and line
 *	number when reporting objects that haven't been freed.
 *
 *	Otherwise, when the core is compiled without TCL_MEM_DEBUG defined,
 *	this function just returns the result of calling Tcl_NewWideIntObj.
 *
 * Results:
 *	The newly created wide integer object is returned. This object will
 *	have an invalid string representation. The returned object has ref
 *	count 0.
 *
 * Side effects:
 *	Allocates memory.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG

Tcl_Obj *
Tcl_DbNewWideIntObj(
    register Tcl_WideInt wideValue,
				/* Wide integer used to initialize the new
				 * object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    register Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    Tcl_SetWideIntObj(objPtr, wideValue);
    return objPtr;
}

#else /* if not TCL_MEM_DEBUG */

Tcl_Obj *
Tcl_DbNewWideIntObj(
    register Tcl_WideInt wideValue,
				/* Long integer used to initialize the new
				 * object. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
    return Tcl_NewWideIntObj(wideValue);
}
#endif /* TCL_MEM_DEBUG */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetWideIntObj --
 *
 *	Modify an object to be a wide integer object and to have the specified
 *	wide integer value.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's old string rep, if any, is freed. Also, any old internal
 *	rep is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetWideIntObj(
    register Tcl_Obj *objPtr,	/* Object w. internal rep to init. */
    register Tcl_WideInt wideValue)
				/* Wide integer used to initialize the
				 * object's value. */
{
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetWideIntObj");
    }

    if ((wideValue >= (Tcl_WideInt) LONG_MIN)
	    && (wideValue <= (Tcl_WideInt) LONG_MAX)) {
	TclSetLongObj(objPtr, (long) wideValue);
    } else {
#ifndef NO_WIDE_TYPE
	TclSetWideIntObj(objPtr, wideValue);
#else
	mp_int big;

	TclBNInitBignumFromWideInt(&big, wideValue);
	Tcl_SetBignumObj(objPtr, &big);
#endif
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetWideIntFromObj --
 *
 *	Attempt to return a wide integer from the Tcl object "objPtr". If the
 *	object is not already a wide int object, an attempt will be made to
 *	convert it to one.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	If the object is not already an int object, the conversion will free
 *	any old internal representation.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetWideIntFromObj(
    Tcl_Interp *interp,         /* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr,	/* Object from which to get a wide int. */
    register Tcl_WideInt *wideIntPtr)
				/* Place to store resulting long. */
{
    do {
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    *wideIntPtr = objPtr->internalRep.wideValue;
	    return TCL_OK;
	}
#endif
	if (objPtr->typePtr == &tclIntType) {
	    *wideIntPtr = (Tcl_WideInt) objPtr->internalRep.longValue;
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclDoubleType) {
	    if (interp != NULL) {
                Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "expected integer but got \"%s\"",
                        Tcl_GetString(objPtr)));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "INTEGER", NULL);
	    }
	    return TCL_ERROR;
	}
	if (objPtr->typePtr == &tclBignumType) {
	    /*
	     * Must check for those bignum values that can fit in a
	     * Tcl_WideInt, even when auto-narrowing is enabled.
	     */

	    mp_int big;

	    UNPACK_BIGNUM(objPtr, big);
	    if ((size_t) big.used <= (CHAR_BIT * sizeof(Tcl_WideInt)
		     + DIGIT_BIT - 1) / DIGIT_BIT) {
		Tcl_WideUInt value = 0;
		unsigned long numBytes = sizeof(Tcl_WideInt);
		Tcl_WideInt scratch;
		unsigned char *bytes = (unsigned char *) &scratch;

		if (mp_to_unsigned_bin_n(&big, bytes, &numBytes) == MP_OKAY) {
		    while (numBytes-- > 0) {
			value = (value << CHAR_BIT) | *bytes++;
		    }
		    if (big.sign) {
			*wideIntPtr = - (Tcl_WideInt) value;
		    } else {
			*wideIntPtr = (Tcl_WideInt) value;
		    }
		    return TCL_OK;
		}
	    }
	    if (interp != NULL) {
		const char *s = "integer value too large to represent";
		Tcl_Obj *msg = Tcl_NewStringObj(s, -1);

		Tcl_SetObjResult(interp, msg);
		Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW", s, NULL);
	    }
	    return TCL_ERROR;
	}
    } while (TclParseNumber(interp, objPtr, "integer", NULL, -1, NULL,
	    TCL_PARSE_INTEGER_ONLY)==TCL_OK);
    return TCL_ERROR;
}
#ifndef NO_WIDE_TYPE

/*
 *----------------------------------------------------------------------
 *
 * SetWideIntFromAny --
 *
 *	Attempts to force the internal representation for a Tcl object to
 *	tclWideIntType, specifically.
 *
 * Results:
 *	The return value is a standard object Tcl result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 *----------------------------------------------------------------------
 */

static int
SetWideIntFromAny(
    Tcl_Interp *interp,		/* Tcl interpreter */
    Tcl_Obj *objPtr)		/* Pointer to the object to convert */
{
    Tcl_WideInt w;
    return Tcl_GetWideIntFromObj(interp, objPtr, &w);
}
#endif /* !NO_WIDE_TYPE */

/*
 *----------------------------------------------------------------------
 *
 * FreeBignum --
 *
 *	This function frees the internal rep of a bignum.
 *
 * Results:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
FreeBignum(
    Tcl_Obj *objPtr)
{
    mp_int toFree;		/* Bignum to free */

    UNPACK_BIGNUM(objPtr, toFree);
    mp_clear(&toFree);
    if ((long) objPtr->internalRep.ptrAndLongRep.value < 0) {
	ckfree(objPtr->internalRep.ptrAndLongRep.ptr);
    }
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * DupBignum --
 *
 *	This function duplicates the internal rep of a bignum.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The destination object receies a copy of the source object
 *
 *----------------------------------------------------------------------
 */

static void
DupBignum(
    Tcl_Obj *srcPtr,
    Tcl_Obj *copyPtr)
{
    mp_int bignumVal;
    mp_int bignumCopy;

    copyPtr->typePtr = &tclBignumType;
    UNPACK_BIGNUM(srcPtr, bignumVal);
    if (mp_init_copy(&bignumCopy, &bignumVal) != MP_OKAY) {
	Tcl_Panic("initialization failure in DupBignum");
    }
    PACK_BIGNUM(bignumCopy, copyPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfBignum --
 *
 *	This function updates the string representation of a bignum object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to whatever results from the bignum-
 *	to-string conversion.
 *
 * The object's existing string representation is NOT freed; memory will leak
 * if the string rep is still valid at the time this function is called.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfBignum(
    Tcl_Obj *objPtr)
{
    mp_int bignumVal;
    int size;
    int status;
    char *stringVal;

    UNPACK_BIGNUM(objPtr, bignumVal);
    status = mp_radix_size(&bignumVal, 10, &size);
    if (status != MP_OKAY) {
	Tcl_Panic("radix size failure in UpdateStringOfBignum");
    }
    if (size == 3) {
	/*
	 * mp_radix_size() returns 3 when more than INT_MAX bytes would be
	 * needed to hold the string rep (because mp_radix_size ignores
	 * integer overflow issues). When we know the string rep will be more
	 * than 3, we can conclude the string rep would overflow our string
	 * length limits.
	 *
	 * Note that so long as we enforce our bignums to the size that fits
	 * in a packed bignum, this branch will never be taken.
	 */

	Tcl_Panic("UpdateStringOfBignum: string length limit exceeded");
    }
    stringVal = ckalloc(size);
    status = mp_toradix_n(&bignumVal, stringVal, 10, size);
    if (status != MP_OKAY) {
	Tcl_Panic("conversion failure in UpdateStringOfBignum");
    }
    objPtr->bytes = stringVal;
    objPtr->length = size - 1;	/* size includes a trailing NUL byte. */
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewBignumObj --
 *
 *	Creates an initializes a bignum object.
 *
 * Results:
 *	Returns the newly created object.
 *
 * Side effects:
 *	The bignum value is cleared, since ownership has transferred to Tcl.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
#undef Tcl_NewBignumObj

Tcl_Obj *
Tcl_NewBignumObj(
    mp_int *bignumValue)
{
    return Tcl_DbNewBignumObj(bignumValue, "unknown", 0);
}
#else
Tcl_Obj *
Tcl_NewBignumObj(
    mp_int *bignumValue)
{
    Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    Tcl_SetBignumObj(objPtr, bignumValue);
    return objPtr;
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbNewBignumObj --
 *
 *	This function is normally called when debugging: that is, when
 *	TCL_MEM_DEBUG is defined. It constructs a bignum object, recording the
 *	creation point so that [memory active] can report it.
 *
 * Results:
 *	Returns the newly created object.
 *
 * Side effects:
 *	The bignum value is cleared, since ownership has transferred to Tcl.
 *
 *----------------------------------------------------------------------
 */

#ifdef TCL_MEM_DEBUG
Tcl_Obj *
Tcl_DbNewBignumObj(
    mp_int *bignumValue,
    const char *file,
    int line)
{
    Tcl_Obj *objPtr;

    TclDbNewObj(objPtr, file, line);
    Tcl_SetBignumObj(objPtr, bignumValue);
    return objPtr;
}
#else
Tcl_Obj *
Tcl_DbNewBignumObj(
    mp_int *bignumValue,
    const char *file,
    int line)
{
    return Tcl_NewBignumObj(bignumValue);
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * GetBignumFromObj --
 *
 *	This function retrieves a 'bignum' value from a Tcl object, converting
 *	the object if necessary. Either copies or transfers the mp_int value
 *	depending on the copy flag value passed in.
 *
 * Results:
 *	Returns TCL_OK if the conversion is successful, TCL_ERROR otherwise.
 *
 * Side effects:
 *	A copy of bignum is stored in *bignumValue, which is expected to be
 *	uninitialized or cleared. If conversion fails, and the 'interp'
 *	argument is not NULL, an error message is stored in the interpreter
 *	result.
 *
 *----------------------------------------------------------------------
 */

static int
GetBignumFromObj(
    Tcl_Interp *interp,		/* Tcl interpreter for error reporting */
    Tcl_Obj *objPtr,		/* Object to read */
    int copy,			/* Whether to copy the returned bignum value */
    mp_int *bignumValue)	/* Returned bignum value. */
{
    do {
	if (objPtr->typePtr == &tclBignumType) {
	    if (copy || Tcl_IsShared(objPtr)) {
		mp_int temp;

		UNPACK_BIGNUM(objPtr, temp);
		mp_init_copy(bignumValue, &temp);
	    } else {
		UNPACK_BIGNUM(objPtr, *bignumValue);
		objPtr->internalRep.ptrAndLongRep.ptr = NULL;
		objPtr->internalRep.ptrAndLongRep.value = 0;
		objPtr->typePtr = NULL;
		if (objPtr->bytes == NULL) {
		    TclInitStringRep(objPtr, tclEmptyStringRep, 0);
		}
	    }
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclIntType) {
	    TclBNInitBignumFromLong(bignumValue, objPtr->internalRep.longValue);
	    return TCL_OK;
	}
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    TclBNInitBignumFromWideInt(bignumValue,
		    objPtr->internalRep.wideValue);
	    return TCL_OK;
	}
#endif
	if (objPtr->typePtr == &tclDoubleType) {
	    if (interp != NULL) {
                Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                        "expected integer but got \"%s\"",
                        Tcl_GetString(objPtr)));
		Tcl_SetErrorCode(interp, "TCL", "VALUE", "INTEGER", NULL);
	    }
	    return TCL_ERROR;
	}
    } while (TclParseNumber(interp, objPtr, "integer", NULL, -1, NULL,
	    TCL_PARSE_INTEGER_ONLY)==TCL_OK);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetBignumFromObj --
 *
 *	This function retrieves a 'bignum' value from a Tcl object, converting
 *	the object if necessary.
 *
 * Results:
 *	Returns TCL_OK if the conversion is successful, TCL_ERROR otherwise.
 *
 * Side effects:
 *	A copy of bignum is stored in *bignumValue, which is expected to be
 *	uninitialized or cleared. If conversion fails, an the 'interp'
 *	argument is not NULL, an error message is stored in the interpreter
 *	result.
 *
 *	It is expected that the caller will NOT have invoked mp_init on the
 *	bignum value before passing it in. Tcl will initialize the mp_int as
 *	it sets the value. The value is a copy of the value in objPtr, so it
 *	becomes the responsibility of the caller to call mp_clear on it.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetBignumFromObj(
    Tcl_Interp *interp,		/* Tcl interpreter for error reporting */
    Tcl_Obj *objPtr,		/* Object to read */
    mp_int *bignumValue)	/* Returned bignum value. */
{
    return GetBignumFromObj(interp, objPtr, 1, bignumValue);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_TakeBignumFromObj --
 *
 *	This function retrieves a 'bignum' value from a Tcl object, converting
 *	the object if necessary.
 *
 * Results:
 *	Returns TCL_OK if the conversion is successful, TCL_ERROR otherwise.
 *
 * Side effects:
 *	A copy of bignum is stored in *bignumValue, which is expected to be
 *	uninitialized or cleared. If conversion fails, an the 'interp'
 *	argument is not NULL, an error message is stored in the interpreter
 *	result.
 *
 *	It is expected that the caller will NOT have invoked mp_init on the
 *	bignum value before passing it in. Tcl will initialize the mp_int as
 *	it sets the value. The value is transferred from the internals of
 *	objPtr to the caller, passing responsibility of the caller to call
 *	mp_clear on it. The objPtr is cleared to hold an empty value.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_TakeBignumFromObj(
    Tcl_Interp *interp,		/* Tcl interpreter for error reporting */
    Tcl_Obj *objPtr,		/* Object to read */
    mp_int *bignumValue)	/* Returned bignum value. */
{
    return GetBignumFromObj(interp, objPtr, 0, bignumValue);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetBignumObj --
 *
 *	This function sets the value of a Tcl_Obj to a large integer.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Object value is stored. The bignum value is cleared, since ownership
 *	has transferred to Tcl.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetBignumObj(
    Tcl_Obj *objPtr,		/* Object to set */
    mp_int *bignumValue)	/* Value to store */
{
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetBignumObj");
    }
    if ((size_t) bignumValue->used
	    <= (CHAR_BIT * sizeof(long) + DIGIT_BIT - 1) / DIGIT_BIT) {
	unsigned long value = 0, numBytes = sizeof(long);
	long scratch;
	unsigned char *bytes = (unsigned char *) &scratch;

	if (mp_to_unsigned_bin_n(bignumValue, bytes, &numBytes) != MP_OKAY) {
	    goto tooLargeForLong;
	}
	while (numBytes-- > 0) {
	    value = (value << CHAR_BIT) | *bytes++;
	}
	if (value > (((~(unsigned long)0) >> 1) + bignumValue->sign)) {
	    goto tooLargeForLong;
	}
	if (bignumValue->sign) {
	    TclSetLongObj(objPtr, -(long)value);
	} else {
	    TclSetLongObj(objPtr, (long)value);
	}
	mp_clear(bignumValue);
	return;
    }
  tooLargeForLong:
#ifndef NO_WIDE_TYPE
    if ((size_t) bignumValue->used
	    <= (CHAR_BIT * sizeof(Tcl_WideInt) + DIGIT_BIT - 1) / DIGIT_BIT) {
	Tcl_WideUInt value = 0;
	unsigned long numBytes = sizeof(Tcl_WideInt);
	Tcl_WideInt scratch;
	unsigned char *bytes = (unsigned char *)&scratch;

	if (mp_to_unsigned_bin_n(bignumValue, bytes, &numBytes) != MP_OKAY) {
	    goto tooLargeForWide;
	}
	while (numBytes-- > 0) {
	    value = (value << CHAR_BIT) | *bytes++;
	}
	if (value > (((~(Tcl_WideUInt)0) >> 1) + bignumValue->sign)) {
	    goto tooLargeForWide;
	}
	if (bignumValue->sign) {
	    TclSetWideIntObj(objPtr, -(Tcl_WideInt)value);
	} else {
	    TclSetWideIntObj(objPtr, (Tcl_WideInt)value);
	}
	mp_clear(bignumValue);
	return;
    }
  tooLargeForWide:
#endif
    TclInvalidateStringRep(objPtr);
    TclFreeIntRep(objPtr);
    TclSetBignumIntRep(objPtr, bignumValue);
}

/*
 *----------------------------------------------------------------------
 *
 * TclSetBignumIntRep --
 *
 *	Install a bignum into the internal representation of an object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Object internal representation is updated and object type is set. The
 *	bignum value is cleared, since ownership has transferred to the
 *	object.
 *
 *----------------------------------------------------------------------
 */

void
TclSetBignumIntRep(
    Tcl_Obj *objPtr,
    mp_int *bignumValue)
{
    objPtr->typePtr = &tclBignumType;
    PACK_BIGNUM(*bignumValue, objPtr);

    /*
     * Clear the mp_int value.
     *
     * Don't call mp_clear() because it would free the digit array we just
     * packed into the Tcl_Obj.
     */

    bignumValue->dp = NULL;
    bignumValue->alloc = bignumValue->used = 0;
    bignumValue->sign = MP_NEG;
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetNumberFromObj --
 *
 *      Extracts a number (of any possible numeric type) from an object.
 *
 * Results:
 *      Whether the extraction worked. The type is stored in the variable
 *      referred to by the typePtr argument, and a pointer to the
 *      representation is stored in the variable referred to by the
 *      clientDataPtr.
 *
 * Side effects:
 *      Can allocate thread-specific data for handling the copy-out space for
 *      bignums; this space is shared within a thread.
 *
 *----------------------------------------------------------------------
 */

int
TclGetNumberFromObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr,
    ClientData *clientDataPtr,
    int *typePtr)
{
    do {
	if (objPtr->typePtr == &tclDoubleType) {
	    if (TclIsNaN(objPtr->internalRep.doubleValue)) {
		*typePtr = TCL_NUMBER_NAN;
	    } else {
		*typePtr = TCL_NUMBER_DOUBLE;
	    }
	    *clientDataPtr = &objPtr->internalRep.doubleValue;
	    return TCL_OK;
	}
	if (objPtr->typePtr == &tclIntType) {
	    *typePtr = TCL_NUMBER_LONG;
	    *clientDataPtr = &objPtr->internalRep.longValue;
	    return TCL_OK;
	}
#ifndef NO_WIDE_TYPE
	if (objPtr->typePtr == &tclWideIntType) {
	    *typePtr = TCL_NUMBER_WIDE;
	    *clientDataPtr = &objPtr->internalRep.wideValue;
	    return TCL_OK;
	}
#endif
	if (objPtr->typePtr == &tclBignumType) {
	    static Tcl_ThreadDataKey bignumKey;
	    mp_int *bigPtr = Tcl_GetThreadData(&bignumKey,
		    (int) sizeof(mp_int));

	    UNPACK_BIGNUM(objPtr, *bigPtr);
	    *typePtr = TCL_NUMBER_BIG;
	    *clientDataPtr = bigPtr;
	    return TCL_OK;
	}
    } while (TCL_OK ==
	    TclParseNumber(interp, objPtr, "number", NULL, -1, NULL, 0));
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbIncrRefCount --
 *
 *	This function is normally called when debugging: i.e., when
 *	TCL_MEM_DEBUG is defined. This checks to see whether or not the memory
 *	has been freed before incrementing the ref count.
 *
 *	When TCL_MEM_DEBUG is not defined, this function just increments the
 *	reference count of the object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's ref count is incremented.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DbIncrRefCount(
    register Tcl_Obj *objPtr,	/* The object we are registering a reference
				 * to. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
	fprintf(stderr, "file = %s, line = %d\n", file, line);
	fflush(stderr);
	Tcl_Panic("incrementing refCount of previously disposed object");
    }

# ifdef TCL_THREADS
    /*
     * Check to make sure that the Tcl_Obj was allocated by the current
     * thread. Don't do this check when shutting down since thread local
     * storage can be finalized before the last Tcl_Obj is freed.
     */

    if (!TclInExit()) {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	Tcl_HashTable *tablePtr = tsdPtr->objThreadMap;
	Tcl_HashEntry *hPtr;

	if (!tablePtr) {
	    Tcl_Panic("object table not initialized");
	}
	hPtr = Tcl_FindHashEntry(tablePtr, objPtr);
	if (!hPtr) {
	    Tcl_Panic("Trying to %s of Tcl_Obj allocated in another thread",
                    "incr ref count");
	}
    }
# endif /* TCL_THREADS */
#endif /* TCL_MEM_DEBUG */
    ++(objPtr)->refCount;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbDecrRefCount --
 *
 *	This function is normally called when debugging: i.e., when
 *	TCL_MEM_DEBUG is defined. This checks to see whether or not the memory
 *	has been freed before decrementing the ref count.
 *
 *	When TCL_MEM_DEBUG is not defined, this function just decrements the
 *	reference count of the object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's ref count is incremented.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DbDecrRefCount(
    register Tcl_Obj *objPtr,	/* The object we are releasing a reference
				 * to. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
	fprintf(stderr, "file = %s, line = %d\n", file, line);
	fflush(stderr);
	Tcl_Panic("decrementing refCount of previously disposed object");
    }

# ifdef TCL_THREADS
    /*
     * Check to make sure that the Tcl_Obj was allocated by the current
     * thread. Don't do this check when shutting down since thread local
     * storage can be finalized before the last Tcl_Obj is freed.
     */

    if (!TclInExit()) {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	Tcl_HashTable *tablePtr = tsdPtr->objThreadMap;
	Tcl_HashEntry *hPtr;

	if (!tablePtr) {
	    Tcl_Panic("object table not initialized");
	}
	hPtr = Tcl_FindHashEntry(tablePtr, objPtr);
	if (!hPtr) {
	    Tcl_Panic("Trying to %s of Tcl_Obj allocated in another thread",
                    "decr ref count");
	}

	/*
	 * If the Tcl_Obj is going to be deleted, remove the entry.
	 */

	if (objPtr->refCount < 2) {
	    ObjData *objData = Tcl_GetHashValue(hPtr);

	    if (objData != NULL) {
		ckfree(objData);
	    }

	    Tcl_DeleteHashEntry(hPtr);
	}
    }
# endif /* TCL_THREADS */
#endif /* TCL_MEM_DEBUG */

    if ((objPtr)->refCount-- < 2) {
	TclFreeObj(objPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DbIsShared --
 *
 *	This function is normally called when debugging: i.e., when
 *	TCL_MEM_DEBUG is defined. It tests whether the object has a ref count
 *	greater than one.
 *
 *	When TCL_MEM_DEBUG is not defined, this function just tests if the
 *	object has a ref count greater than one.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_DbIsShared(
    register Tcl_Obj *objPtr,	/* The object to test for being shared. */
    const char *file,		/* The name of the source file calling this
				 * function; used for debugging. */
    int line)			/* Line number in the source file; used for
				 * debugging. */
{
#ifdef TCL_MEM_DEBUG
    if (objPtr->refCount == 0x61616161) {
	fprintf(stderr, "file = %s, line = %d\n", file, line);
	fflush(stderr);
	Tcl_Panic("checking whether previously disposed object is shared");
    }

# ifdef TCL_THREADS
    /*
     * Check to make sure that the Tcl_Obj was allocated by the current
     * thread. Don't do this check when shutting down since thread local
     * storage can be finalized before the last Tcl_Obj is freed.
     */

    if (!TclInExit()) {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	Tcl_HashTable *tablePtr = tsdPtr->objThreadMap;
	Tcl_HashEntry *hPtr;

	if (!tablePtr) {
	    Tcl_Panic("object table not initialized");
	}
	hPtr = Tcl_FindHashEntry(tablePtr, objPtr);
	if (!hPtr) {
	    Tcl_Panic("Trying to %s of Tcl_Obj allocated in another thread",
                    "check shared status");
	}
    }
# endif /* TCL_THREADS */
#endif /* TCL_MEM_DEBUG */

#ifdef TCL_COMPILE_STATS
    Tcl_MutexLock(&tclObjMutex);
    if ((objPtr)->refCount <= 1) {
	tclObjsShared[1]++;
    } else if ((objPtr)->refCount < TCL_MAX_SHARED_OBJ_STATS) {
	tclObjsShared[(objPtr)->refCount]++;
    } else {
	tclObjsShared[0]++;
    }
    Tcl_MutexUnlock(&tclObjMutex);
#endif /* TCL_COMPILE_STATS */

    return ((objPtr)->refCount > 1);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitObjHashTable --
 *
 *	Given storage for a hash table, set up the fields to prepare the hash
 *	table for use, the keys are Tcl_Obj *.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	TablePtr is now ready to be passed to Tcl_FindHashEntry and
 *	Tcl_CreateHashEntry.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_InitObjHashTable(
    register Tcl_HashTable *tablePtr)
				/* Pointer to table record, which is supplied
				 * by the caller. */
{
    Tcl_InitCustomHashTable(tablePtr, TCL_CUSTOM_PTR_KEYS,
	    &tclObjHashKeyType);
}

/*
 *----------------------------------------------------------------------
 *
 * AllocObjEntry --
 *
 *	Allocate space for a Tcl_HashEntry containing the Tcl_Obj * key.
 *
 * Results:
 *	The return value is a pointer to the created entry.
 *
 * Side effects:
 *	Increments the reference count on the object.
 *
 *----------------------------------------------------------------------
 */

static Tcl_HashEntry *
AllocObjEntry(
    Tcl_HashTable *tablePtr,	/* Hash table. */
    void *keyPtr)		/* Key to store in the hash table entry. */
{
    Tcl_Obj *objPtr = keyPtr;
    Tcl_HashEntry *hPtr = ckalloc(sizeof(Tcl_HashEntry));

    hPtr->key.objPtr = objPtr;
    Tcl_IncrRefCount(objPtr);
    hPtr->clientData = NULL;

    return hPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompareObjKeys --
 *
 *	Compares two Tcl_Obj * keys.
 *
 * Results:
 *	The return value is 0 if they are different and 1 if they are the
 *	same.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclCompareObjKeys(
    void *keyPtr,		/* New key to compare. */
    Tcl_HashEntry *hPtr)	/* Existing key to compare. */
{
    Tcl_Obj *objPtr1 = keyPtr;
    Tcl_Obj *objPtr2 = (Tcl_Obj *) hPtr->key.oneWordValue;
    register const char *p1, *p2;
    register int l1, l2;

    /*
     * If the object pointers are the same then they match.
     */

    if (objPtr1 == objPtr2) {
	return 1;
    }

    /*
     * Don't use Tcl_GetStringFromObj as it would prevent l1 and l2 being
     * in a register.
     */

    p1 = TclGetString(objPtr1);
    l1 = objPtr1->length;
    p2 = TclGetString(objPtr2);
    l2 = objPtr2->length;

    /*
     * Only compare if the string representations are of the same length.
     */

    if (l1 == l2) {
	for (;; p1++, p2++, l1--) {
	    if (*p1 != *p2) {
		break;
	    }
	    if (l1 == 0) {
		return 1;
	    }
	}
    }

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFreeObjEntry --
 *
 *	Frees space for a Tcl_HashEntry containing the Tcl_Obj * key.
 *
 * Results:
 *	The return value is a pointer to the created entry.
 *
 * Side effects:
 *	Decrements the reference count of the object.
 *
 *----------------------------------------------------------------------
 */

void
TclFreeObjEntry(
    Tcl_HashEntry *hPtr)	/* Hash entry to free. */
{
    Tcl_Obj *objPtr = (Tcl_Obj *) hPtr->key.oneWordValue;

    Tcl_DecrRefCount(objPtr);
    ckfree(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclHashObjKey --
 *
 *	Compute a one-word summary of the string representation of the
 *	Tcl_Obj, which can be used to generate a hash index.
 *
 * Results:
 *	The return value is a one-word summary of the information in the
 *	string representation of the Tcl_Obj.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

unsigned int
TclHashObjKey(
    Tcl_HashTable *tablePtr,	/* Hash table. */
    void *keyPtr)		/* Key from which to compute hash value. */
{
    Tcl_Obj *objPtr = keyPtr;
    int length;
    const char *string = TclGetStringFromObj(objPtr, &length);
    unsigned int result = 0;

    /*
     * I tried a zillion different hash functions and asked many other people
     * for advice. Many people had their own favorite functions, all
     * different, but no-one had much idea why they were good ones. I chose
     * the one below (multiply by 9 and add new character) because of the
     * following reasons:
     *
     * 1. Multiplying by 10 is perfect for keys that are decimal strings, and
     *    multiplying by 9 is just about as good.
     * 2. Times-9 is (shift-left-3) plus (old). This means that each
     *    character's bits hang around in the low-order bits of the hash value
     *    for ever, plus they spread fairly rapidly up to the high-order bits
     *    to fill out the hash value. This seems works well both for decimal
     *    and non-decimal strings.
     *
     * Note that this function is very weak against malicious strings; it's
     * very easy to generate multiple keys that have the same hashcode. On the
     * other hand, that hardly ever actually occurs and this function *is*
     * very cheap, even by comparison with industry-standard hashes like FNV.
     * If real strength of hash is required though, use a custom hash based on
     * Bob Jenkins's lookup3(), but be aware that it's significantly slower.
     * Tcl does not use that level of strength because it typically does not
     * need it (and some of the aspects of that strength are genuinely
     * unnecessary given the rest of Tcl's hash machinery, and the fact that
     * we do not either transfer hashes to another machine, use them as a true
     * substitute for equality, or attempt to minimize work in rebuilding the
     * hash table).
     *
     * See also HashStringKey in tclHash.c.
     * See also HashString in tclLiteral.c.
     *
     * See [tcl-Feature Request #2958832]
     */

    if (length > 0) {
	result = UCHAR(*string);
	while (--length) {
	    result += (result << 3) + UCHAR(*++string);
	}
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandFromObj --
 *
 *	Returns the command specified by the name in a Tcl_Obj.
 *
 * Results:
 *	Returns a token for the command if it is found. Otherwise, if it can't
 *	be found or there is an error, returns NULL.
 *
 * Side effects:
 *	May update the internal representation for the object, caching the
 *	command reference so that the next time this function is called with
 *	the same object, the command can be found quickly.
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
Tcl_GetCommandFromObj(
    Tcl_Interp *interp,		/* The interpreter in which to resolve the
				 * command and to report errors. */
    register Tcl_Obj *objPtr)	/* The object containing the command's name.
				 * If the name starts with "::", will be
				 * looked up in global namespace. Else, looked
				 * up first in the current namespace, then in
				 * global namespace. */
{
    register ResolvedCmdName *resPtr;

    /*
     * Get the internal representation, converting to a command type if
     * needed. The internal representation is a ResolvedCmdName that points to
     * the actual command.
     *
     * Check the context namespace and the namespace epoch of the resolved
     * symbol to make sure that it is fresh. Note that we verify that the
     * namespace id of the context namespace is the same as the one we cached;
     * this insures that the namespace wasn't deleted and a new one created at
     * the same address with the same command epoch. Note that fully qualified
     * names have a NULL refNsPtr, these checks needn't be made.
     *
     * Check also that the command's epoch is up to date, and that the command
     * is not deleted.
     *
     * If any check fails, then force another conversion to the command type,
     * to discard the old rep and create a new one.
     */

    resPtr = objPtr->internalRep.twoPtrValue.ptr1;
    if ((objPtr->typePtr == &tclCmdNameType) && (resPtr != NULL)) {
        register Command *cmdPtr = resPtr->cmdPtr;

        if ((cmdPtr->cmdEpoch == resPtr->cmdEpoch)
                && !(cmdPtr->flags & CMD_IS_DELETED)
                && (interp == cmdPtr->nsPtr->interp)
                && !(cmdPtr->nsPtr->flags & NS_DYING)) {
            register Namespace *refNsPtr = (Namespace *)
                    TclGetCurrentNamespace(interp);

            if ((resPtr->refNsPtr == NULL)
                || ((refNsPtr == resPtr->refNsPtr)
                    && (resPtr->refNsId == refNsPtr->nsId)
                    && (resPtr->refNsCmdEpoch == refNsPtr->cmdRefEpoch))) {
                return (Tcl_Command) cmdPtr;
            }
        }
    }

    /*
     * OK, must create a new internal representation (or fail) as any cache we
     * had is invalid one way or another.
     */

    if (SetCmdNameFromAny(interp, objPtr) != TCL_OK) {
        return NULL;
    }
    resPtr = objPtr->internalRep.twoPtrValue.ptr1;
    return (Tcl_Command) (resPtr ? resPtr->cmdPtr : NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * TclSetCmdNameObj --
 *
 *	Modify an object to be an CmdName object that refers to the argument
 *	Command structure.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's old internal rep is freed. It's string rep is not
 *	changed. The refcount in the Command structure is incremented to keep
 *	it from being freed if the command is later deleted until
 *	TclNRExecuteByteCode has a chance to recognize that it was deleted.
 *
 *----------------------------------------------------------------------
 */

void
TclSetCmdNameObj(
    Tcl_Interp *interp,		/* Points to interpreter containing command
				 * that should be cached in objPtr. */
    register Tcl_Obj *objPtr,	/* Points to Tcl object to be changed to a
				 * CmdName object. */
    Command *cmdPtr)		/* Points to Command structure that the
				 * CmdName object should refer to. */
{
    Interp *iPtr = (Interp *) interp;
    register ResolvedCmdName *resPtr;
    register Namespace *currNsPtr;
    const char *name;

    if (objPtr->typePtr == &tclCmdNameType) {
	return;
    }

    cmdPtr->refCount++;
    resPtr = ckalloc(sizeof(ResolvedCmdName));
    resPtr->cmdPtr = cmdPtr;
    resPtr->cmdEpoch = cmdPtr->cmdEpoch;
    resPtr->refCount = 1;

    name = TclGetString(objPtr);
    if ((*name++ == ':') && (*name == ':')) {
	/*
	 * The name is fully qualified: set the referring namespace to
	 * NULL.
	 */

	resPtr->refNsPtr = NULL;
    } else {
	/*
	 * Get the current namespace.
	 */

	currNsPtr = iPtr->varFramePtr->nsPtr;

	resPtr->refNsPtr = currNsPtr;
	resPtr->refNsId = currNsPtr->nsId;
	resPtr->refNsCmdEpoch = currNsPtr->cmdRefEpoch;
    }

    TclFreeIntRep(objPtr);
    objPtr->internalRep.twoPtrValue.ptr1 = resPtr;
    objPtr->internalRep.twoPtrValue.ptr2 = NULL;
    objPtr->typePtr = &tclCmdNameType;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeCmdNameInternalRep --
 *
 *	Frees the resources associated with a cmdName object's internal
 *	representation.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Decrements the ref count of any cached ResolvedCmdName structure
 *	pointed to by the cmdName's internal representation. If this is the
 *	last use of the ResolvedCmdName, it is freed. This in turn decrements
 *	the ref count of the Command structure pointed to by the
 *	ResolvedSymbol, which may free the Command structure.
 *
 *----------------------------------------------------------------------
 */

static void
FreeCmdNameInternalRep(
    register Tcl_Obj *objPtr)	/* CmdName object with internal
				 * representation to free. */
{
    register ResolvedCmdName *resPtr = objPtr->internalRep.twoPtrValue.ptr1;

    if (resPtr != NULL) {
	/*
	 * Decrement the reference count of the ResolvedCmdName structure. If
	 * there are no more uses, free the ResolvedCmdName structure.
	 */

	resPtr->refCount--;
	if (resPtr->refCount == 0) {
	    /*
	     * Now free the cached command, unless it is still in its hash
	     * table or if there are other references to it from other cmdName
	     * objects.
	     */

	    Command *cmdPtr = resPtr->cmdPtr;

	    TclCleanupCommandMacro(cmdPtr);
	    ckfree(resPtr);
	}
    }
    objPtr->typePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * DupCmdNameInternalRep --
 *
 *	Initialize the internal representation of an cmdName Tcl_Obj to a copy
 *	of the internal representation of an existing cmdName object.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	"copyPtr"s internal rep is set to point to the ResolvedCmdName
 *	structure corresponding to "srcPtr"s internal rep. Increments the ref
 *	count of the ResolvedCmdName structure pointed to by the cmdName's
 *	internal representation.
 *
 *----------------------------------------------------------------------
 */

static void
DupCmdNameInternalRep(
    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    register Tcl_Obj *copyPtr)	/* Object with internal rep to set. */
{
    register ResolvedCmdName *resPtr = srcPtr->internalRep.twoPtrValue.ptr1;

    copyPtr->internalRep.twoPtrValue.ptr1 = resPtr;
    copyPtr->internalRep.twoPtrValue.ptr2 = NULL;
    if (resPtr != NULL) {
	resPtr->refCount++;
    }
    copyPtr->typePtr = &tclCmdNameType;
}

/*
 *----------------------------------------------------------------------
 *
 * SetCmdNameFromAny --
 *
 *	Generate an cmdName internal form for the Tcl object "objPtr".
 *
 * Results:
 *	The return value is a standard Tcl result. The conversion always
 *	succeeds and TCL_OK is returned.
 *
 * Side effects:
 *	A pointer to a ResolvedCmdName structure that holds a cached pointer
 *	to the command with a name that matches objPtr's string rep is stored
 *	as objPtr's internal representation. This ResolvedCmdName pointer will
 *	be NULL if no matching command was found. The ref count of the cached
 *	Command's structure (if any) is also incremented.
 *
 *----------------------------------------------------------------------
 */

static int
SetCmdNameFromAny(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    register Tcl_Obj *objPtr)	/* The object to convert. */
{
    Interp *iPtr = (Interp *) interp;
    const char *name;
    register Command *cmdPtr;
    Namespace *currNsPtr;
    register ResolvedCmdName *resPtr;

    if (interp == NULL) {
	return TCL_ERROR;
    }

    /*
     * Find the Command structure, if any, that describes the command called
     * "name". Build a ResolvedCmdName that holds a cached pointer to this
     * Command, and bump the reference count in the referenced Command
     * structure. A Command structure will not be deleted as long as it is
     * referenced from a CmdName object.
     */

    name = TclGetString(objPtr);
    cmdPtr = (Command *)
	    Tcl_FindCommand(interp, name, /*ns*/ NULL, /*flags*/ 0);

    /*
     * Free the old internalRep before setting the new one. Do this after
     * getting the string rep to allow the conversion code (in particular,
     * Tcl_GetStringFromObj) to use that old internalRep.
     */

    if (cmdPtr) {
	cmdPtr->refCount++;
	resPtr = objPtr->internalRep.twoPtrValue.ptr1;
	if ((objPtr->typePtr == &tclCmdNameType)
		&& resPtr && (resPtr->refCount == 1)) {
	    /*
	     * Reuse the old ResolvedCmdName struct instead of freeing it
	     */

	    Command *oldCmdPtr = resPtr->cmdPtr;

	    if (--oldCmdPtr->refCount == 0) {
		TclCleanupCommandMacro(oldCmdPtr);
	    }
	} else {
	    TclFreeIntRep(objPtr);
	    resPtr = ckalloc(sizeof(ResolvedCmdName));
	    resPtr->refCount = 1;
	    objPtr->internalRep.twoPtrValue.ptr1 = resPtr;
	    objPtr->internalRep.twoPtrValue.ptr2 = NULL;
	    objPtr->typePtr = &tclCmdNameType;
	}
	resPtr->cmdPtr = cmdPtr;
	resPtr->cmdEpoch = cmdPtr->cmdEpoch;
	if ((*name++ == ':') && (*name == ':')) {
	    /*
	     * The name is fully qualified: set the referring namespace to
	     * NULL.
	     */

	    resPtr->refNsPtr = NULL;
	} else {
	    /*
	     * Get the current namespace.
	     */

	    currNsPtr = iPtr->varFramePtr->nsPtr;

	    resPtr->refNsPtr = currNsPtr;
	    resPtr->refNsId = currNsPtr->nsId;
	    resPtr->refNsCmdEpoch = currNsPtr->cmdRefEpoch;
	}
    } else {
	TclFreeIntRep(objPtr);
	objPtr->internalRep.twoPtrValue.ptr1 = NULL;
	objPtr->internalRep.twoPtrValue.ptr2 = NULL;
	objPtr->typePtr = &tclCmdNameType;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_RepresentationCmd --
 *
 *	Implementation of the "tcl::unsupported::representation" command.
 *
 * Results:
 *	Reports the current representation (Tcl_Obj type) of its argument.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_RepresentationCmd(
    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    char ptrBuffer[2*TCL_INTEGER_SPACE+6];
    Tcl_Obj *descObj;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "value");
	return TCL_ERROR;
    }

    /*
     * Value is a bignum with a refcount of 14, object pointer at 0x12345678,
     * internal representation 0x45671234:0x98765432, string representation
     * "1872361827361287"
     */

    sprintf(ptrBuffer, "%p", (void *) objv[1]);
    descObj = Tcl_ObjPrintf("value is a %s with a refcount of %d,"
            " object pointer at %s",
            objv[1]->typePtr ? objv[1]->typePtr->name : "pure string",
	    objv[1]->refCount, ptrBuffer);

    if (objv[1]->typePtr) {
	sprintf(ptrBuffer, "%p:%p",
		(void *) objv[1]->internalRep.twoPtrValue.ptr1,
		(void *) objv[1]->internalRep.twoPtrValue.ptr2);
	Tcl_AppendPrintfToObj(descObj, ", internal representation %s",
		ptrBuffer);
    }

    if (objv[1]->bytes) {
        Tcl_AppendToObj(descObj, ", string representation \"", -1);
	Tcl_AppendLimitedToObj(descObj, objv[1]->bytes, objv[1]->length,
                16, "...");
	Tcl_AppendToObj(descObj, "\"", -1);
    } else {
	Tcl_AppendToObj(descObj, ", no string representation", -1);
    }

    Tcl_SetObjResult(interp, descObj);
    return TCL_OK;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 */