summaryrefslogtreecommitdiffstats
path: root/generic/tclBasic.c
blob: ab1806efd98d7cce1822901e62b603f828a38669 (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
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
8368
8369
8370
8371
8372
8373
8374
8375
8376
8377
8378
8379
8380
8381
8382
8383
8384
8385
8386
8387
8388
8389
8390
8391
8392
8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
8407
8408
8409
8410
8411
8412
8413
8414
8415
8416
8417
8418
8419
8420
8421
8422
8423
8424
8425
8426
8427
8428
8429
8430
8431
8432
8433
8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
8463
8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
8526
8527
8528
8529
8530
8531
8532
8533
8534
8535
8536
8537
8538
8539
8540
8541
8542
8543
8544
8545
8546
8547
8548
8549
8550
8551
/*
 * tclBasic.c --
 *
 *	Contains the basic facilities for TCL command interpretation,
 *	including interpreter creation and deletion, command creation and
 *	deletion, and command/script execution.
 *
 * Copyright (c) 1987-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 * Copyright (c) 2001, 2002 by Kevin B. Kenny.  All rights reserved.
 * Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
 * Copyright (c) 2006-2008 by Joe Mistachkin.  All rights reserved.
 * Copyright (c) 2008 Miguel Sofer <msofer@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclBasic.c,v 1.380 2009/01/09 11:21:45 dkf Exp $
 */

#include "tclInt.h"
#include "tclOOInt.h"
#include "tclCompile.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#include "tommath.h"

#if NRE_ENABLE_ASSERTS
#include <assert.h>
#endif

/*
 * Determine whether we're using IEEE floating point
 */

#if (FLT_RADIX == 2) && (DBL_MANT_DIG == 53) && (DBL_MAX_EXP == 1024)
#   define IEEE_FLOATING_POINT
/* Largest odd integer that can be represented exactly in a double */
#   define MAX_EXACT 9007199254740991.0
#endif

/*
 * The following structure defines the client data for a math function
 * registered with Tcl_CreateMathFunc
 */

typedef struct OldMathFuncData {
    Tcl_MathProc *proc;		/* Handler function */
    int numArgs;		/* Number of args expected */
    Tcl_ValueType *argTypes;	/* Types of the args */
    ClientData clientData;	/* Client data for the handler function */
} OldMathFuncData;

/*
 * Static functions in this file:
 */

static char *	CallCommandTraces(Interp *iPtr, Command *cmdPtr,
		    const char *oldName, const char *newName, int flags);
static int	CancelEvalProc(ClientData clientData,
		    Tcl_Interp *interp, int code);
static int	CheckDoubleResult(Tcl_Interp *interp, double dResult);
static void	DeleteInterpProc(Tcl_Interp *interp);
static void	DeleteOpCmdClientData(ClientData clientData);
static Tcl_Obj *GetCommandSource(Interp *iPtr, int objc,
		    Tcl_Obj *const objv[], int lookup);
static void	ProcessUnexpectedResult(Tcl_Interp *interp, int returnCode);
static int	OldMathFuncProc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static void	OldMathFuncDeleteProc(ClientData clientData);
static int	ExprAbsFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprBinaryFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprBoolFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprCeilFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprDoubleFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprEntierFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprFloorFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprIntFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprIsqrtFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprRandFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprRoundFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprSqrtFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprSrandFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprUnaryFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static int	ExprWideFunc(ClientData clientData, Tcl_Interp *interp,
		    int argc, Tcl_Obj *const *objv);
static void	MathFuncWrongNumArgs(Tcl_Interp *interp, int expected,
		    int actual, Tcl_Obj *const *objv);
#ifdef USE_DTRACE
static int	DTraceObjCmd(ClientData dummy, Tcl_Interp *interp, int objc,
		    Tcl_Obj *const objv[]);
static int	DTraceCmdReturn(ClientData data[], Tcl_Interp *interp,
		    int result);
#else
#define		DTraceCmdReturn NULL
#endif

MODULE_SCOPE const TclStubs * const tclConstStubsPtr;

/*
 * Tcl_EvalObjv helpers
 */

static void		TEOV_SwitchVarFrame(Tcl_Interp *interp);
static void		TEOV_PushExceptionHandlers(Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[], int flags);
static inline Command *	TEOV_LookupCmdFromObj(Tcl_Interp *interp,
			    Tcl_Obj *namePtr, Namespace *lookupNsPtr);
static int		TEOV_NotFound(Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[], Namespace *lookupNsPtr);
static int		TEOV_RunEnterTraces(Tcl_Interp *interp,
			    Command **cmdPtrPtr, int objc,
			    Tcl_Obj *const objv[], Namespace *lookupNsPtr);
static Tcl_NRPostProc	TEOV_RestoreVarFrame;
static Tcl_NRPostProc	TEOV_RunLeaveTraces;
static Tcl_NRPostProc	TEOV_Exception;
static Tcl_NRPostProc	TEOV_Error;
static Tcl_NRPostProc	TEOEx_ListCallback;
static Tcl_NRPostProc	TEOEx_ByteCodeCallback;

static Tcl_NRPostProc   NRRunObjProc;

static Tcl_NRPostProc	AtProcExitCleanup;
static Tcl_NRPostProc   NRAtProcExitEval;

/*
 * The following structure define the commands in the Tcl core.
 */

typedef struct {
    const char *name;		/* Name of object-based command. */
    Tcl_ObjCmdProc *objProc;	/* Object-based function for command. */
    CompileProc *compileProc;	/* Function called to compile command. */
    Tcl_ObjCmdProc *nreProc;	/* NR-based function for command */
    int isSafe;			/* If non-zero, command will be present in
				 * safe interpreter. Otherwise it will be
				 * hidden. */
} CmdInfo;

/*
 * The built-in commands, and the functions that implement them:
 */

static const CmdInfo builtInCmds[] = {
    /*
     * Commands in the generic core.
     */

    {"append",		Tcl_AppendObjCmd,	TclCompileAppendCmd,	NULL,	1},
    {"apply",		Tcl_ApplyObjCmd,	NULL,			TclNRApplyObjCmd,	1},
    {"array",		Tcl_ArrayObjCmd,	NULL,			NULL,	1},
    {"break",		Tcl_BreakObjCmd,	TclCompileBreakCmd,	NULL,	1},
#ifndef EXCLUDE_OBSOLETE_COMMANDS
    {"case",		Tcl_CaseObjCmd,		NULL,			NULL,	1},
#endif
    {"catch",		Tcl_CatchObjCmd,	TclCompileCatchCmd,	TclNRCatchObjCmd,	1},
    {"concat",		Tcl_ConcatObjCmd,	NULL,			NULL,	1},
    {"continue",	Tcl_ContinueObjCmd,	TclCompileContinueCmd,	NULL,	1},
    {"coroutine",	NULL,			NULL,			TclNRCoroutineObjCmd,	1},
    {"error",		Tcl_ErrorObjCmd,	NULL,			NULL,	1},
    {"eval",		Tcl_EvalObjCmd,		NULL,			NULL,	1},
    {"expr",		Tcl_ExprObjCmd,		TclCompileExprCmd,	NULL,	1},
    {"for",		Tcl_ForObjCmd,		TclCompileForCmd,	TclNRForObjCmd,	1},
    {"foreach",		Tcl_ForeachObjCmd,	TclCompileForeachCmd,	TclNRForeachCmd,	1},
    {"format",		Tcl_FormatObjCmd,	NULL,			NULL,	1},
    {"global",		Tcl_GlobalObjCmd,	TclCompileGlobalCmd,	NULL,	1},
    {"if",		Tcl_IfObjCmd,		TclCompileIfCmd,	TclNRIfObjCmd,	1},
    {"incr",		Tcl_IncrObjCmd,		TclCompileIncrCmd,	NULL,	1},
    {"join",		Tcl_JoinObjCmd,		NULL,			NULL,	1},
    {"lappend",		Tcl_LappendObjCmd,	TclCompileLappendCmd,	NULL,	1},
    {"lassign",		Tcl_LassignObjCmd,	TclCompileLassignCmd,	NULL,	1},
    {"lindex",		Tcl_LindexObjCmd,	TclCompileLindexCmd,	NULL,	1},
    {"linsert",		Tcl_LinsertObjCmd,	NULL,			NULL,	1},
    {"list",		Tcl_ListObjCmd,		TclCompileListCmd,	NULL,	1},
    {"llength",		Tcl_LlengthObjCmd,	TclCompileLlengthCmd,	NULL,	1},
    {"lrange",		Tcl_LrangeObjCmd,	NULL,			NULL,	1},
    {"lrepeat",		Tcl_LrepeatObjCmd,	NULL,			NULL,	1},
    {"lreplace",	Tcl_LreplaceObjCmd,	NULL,			NULL,	1},
    {"lreverse",	Tcl_LreverseObjCmd,	NULL,			NULL,	1},
    {"lsearch",		Tcl_LsearchObjCmd,	NULL,			NULL,	1},
    {"lset",		Tcl_LsetObjCmd,		TclCompileLsetCmd,	NULL,	1},
    {"lsort",		Tcl_LsortObjCmd,	NULL,			NULL,	1},
    {"namespace",	Tcl_NamespaceObjCmd,	TclCompileNamespaceCmd,	TclNRNamespaceObjCmd,	1},
    {"package",		Tcl_PackageObjCmd,	NULL,			NULL,	1},
    {"proc",		Tcl_ProcObjCmd,		NULL,			NULL,	1},
    {"regexp",		Tcl_RegexpObjCmd,	TclCompileRegexpCmd,	NULL,	1},
    {"regsub",		Tcl_RegsubObjCmd,	NULL,			NULL,	1},
    {"rename",		Tcl_RenameObjCmd,	NULL,			NULL,	1},
    {"return",		Tcl_ReturnObjCmd,	TclCompileReturnCmd,	NULL,	1},
    {"scan",		Tcl_ScanObjCmd,		NULL,			NULL,	1},
    {"set",		Tcl_SetObjCmd,		TclCompileSetCmd,	NULL,	1},
    {"split",		Tcl_SplitObjCmd,	NULL,			NULL,	1},
    {"subst",		Tcl_SubstObjCmd,	NULL,			NULL,	1},
    {"switch",		Tcl_SwitchObjCmd,	TclCompileSwitchCmd,	NULL,	1},
    {"trace",		Tcl_TraceObjCmd,	NULL,			NULL,	1},
    {"unset",		Tcl_UnsetObjCmd,	NULL,			NULL,	1},
    {"uplevel",		Tcl_UplevelObjCmd,	NULL,			TclNRUplevelObjCmd,	1},
    {"upvar",		Tcl_UpvarObjCmd,	TclCompileUpvarCmd,	NULL,	1},
    {"variable",	Tcl_VariableObjCmd,	TclCompileVariableCmd,	NULL,	1},
    {"while",		Tcl_WhileObjCmd,	TclCompileWhileCmd,	TclNRWhileObjCmd,	1},
    {"yield",		NULL,			NULL,			TclNRYieldObjCmd,	1},

    /*
     * Commands in the OS-interface. Note that many of these are unsafe.
     */

    {"after",		Tcl_AfterObjCmd,	NULL,			NULL,	1},
    {"cd",		Tcl_CdObjCmd,		NULL,			NULL,	0},
    {"close",		Tcl_CloseObjCmd,	NULL,			NULL,	1},
    {"eof",		Tcl_EofObjCmd,		NULL,			NULL,	1},
    {"encoding",	Tcl_EncodingObjCmd,	NULL,			NULL,	0},
    {"exec",		Tcl_ExecObjCmd,		NULL,			NULL,	0},
    {"exit",		Tcl_ExitObjCmd,		NULL,			NULL,	0},
    {"fblocked",	Tcl_FblockedObjCmd,	NULL,			NULL,	1},
    {"fconfigure",	Tcl_FconfigureObjCmd,	NULL,			NULL,	0},
    {"fcopy",		Tcl_FcopyObjCmd,	NULL,			NULL,	1},
    {"file",		Tcl_FileObjCmd,		NULL,			NULL,	0},
    {"fileevent",	Tcl_FileEventObjCmd,	NULL,			NULL,	1},
    {"flush",		Tcl_FlushObjCmd,	NULL,			NULL,	1},
    {"gets",		Tcl_GetsObjCmd,		NULL,			NULL,	1},
    {"glob",		Tcl_GlobObjCmd,		NULL,			NULL,	0},
    {"load",		Tcl_LoadObjCmd,		NULL,			NULL,	0},
    {"open",		Tcl_OpenObjCmd,		NULL,			NULL,	0},
    {"pid",		Tcl_PidObjCmd,		NULL,			NULL,	1},
    {"puts",		Tcl_PutsObjCmd,		NULL,			NULL,	1},
    {"pwd",		Tcl_PwdObjCmd,		NULL,			NULL,	0},
    {"read",		Tcl_ReadObjCmd,		NULL,			NULL,	1},
    {"seek",		Tcl_SeekObjCmd,		NULL,			NULL,	1},
    {"socket",		Tcl_SocketObjCmd,	NULL,			NULL,	0},
    {"source",		Tcl_SourceObjCmd,	NULL,			TclNRSourceObjCmd,	0},
    {"tell",		Tcl_TellObjCmd,		NULL,			NULL,	1},
    {"time",		Tcl_TimeObjCmd,		NULL,			NULL,	1},
    {"unload",		Tcl_UnloadObjCmd,	NULL,			NULL,	0},
    {"update",		Tcl_UpdateObjCmd,	NULL,			NULL,	1},
    {"vwait",		Tcl_VwaitObjCmd,	NULL,			NULL,	1},
    {NULL,		NULL,			NULL,			NULL,	0}
};

/*
 * Math functions. All are safe.
 */

typedef struct {
    const char *name;		/* Name of the function. The full name is
				 * "::tcl::mathfunc::<name>". */
    Tcl_ObjCmdProc *objCmdProc;	/* Function that evaluates the function */
    ClientData clientData;	/* Client data for the function */
} BuiltinFuncDef;
static const BuiltinFuncDef BuiltinFuncTable[] = {
    { "abs",	ExprAbsFunc,	NULL			},
    { "acos",	ExprUnaryFunc,	(ClientData) acos	},
    { "asin",	ExprUnaryFunc,	(ClientData) asin	},
    { "atan",	ExprUnaryFunc,	(ClientData) atan	},
    { "atan2",	ExprBinaryFunc,	(ClientData) atan2	},
    { "bool",	ExprBoolFunc,	NULL			},
    { "ceil",	ExprCeilFunc,	NULL			},
    { "cos",	ExprUnaryFunc,	(ClientData) cos	},
    { "cosh",	ExprUnaryFunc,	(ClientData) cosh	},
    { "double",	ExprDoubleFunc,	NULL			},
    { "entier",	ExprEntierFunc,	NULL			},
    { "exp",	ExprUnaryFunc,	(ClientData) exp	},
    { "floor",	ExprFloorFunc,	NULL			},
    { "fmod",	ExprBinaryFunc,	(ClientData) fmod	},
    { "hypot",	ExprBinaryFunc,	(ClientData) hypot	},
    { "int",	ExprIntFunc,	NULL			},
    { "isqrt",	ExprIsqrtFunc,	NULL			},
    { "log",	ExprUnaryFunc,	(ClientData) log	},
    { "log10",	ExprUnaryFunc,	(ClientData) log10	},
    { "pow",	ExprBinaryFunc,	(ClientData) pow	},
    { "rand",	ExprRandFunc,	NULL			},
    { "round",	ExprRoundFunc,	NULL			},
    { "sin",	ExprUnaryFunc,	(ClientData) sin	},
    { "sinh",	ExprUnaryFunc,	(ClientData) sinh	},
    { "sqrt",	ExprSqrtFunc,	NULL			},
    { "srand",	ExprSrandFunc,	NULL			},
    { "tan",	ExprUnaryFunc,	(ClientData) tan	},
    { "tanh",	ExprUnaryFunc,	(ClientData) tanh	},
    { "wide",	ExprWideFunc,	NULL			},
    { NULL, NULL, NULL }
};

/*
 * TIP#174's math operators. All are safe.
 */

typedef struct {
    const char *name;		/* Name of object-based command. */
    Tcl_ObjCmdProc *objProc;	/* Object-based function for command. */
    CompileProc *compileProc;	/* Function called to compile command. */
    union {
	int numArgs;
	int identity;
    } i;
    const char *expected;	/* For error message, what argument(s)
				 * were expected. */
} OpCmdInfo;
static const OpCmdInfo mathOpCmds[] = {
    { "~",	TclSingleOpCmd,		TclCompileInvertOpCmd,
		/* numArgs */ {1},	"integer"},
    { "!",	TclSingleOpCmd,		TclCompileNotOpCmd,
		/* numArgs */ {1},	"boolean"},
    { "+",	TclVariadicOpCmd,	TclCompileAddOpCmd,
		/* identity */ {0},	NULL},
    { "*",	TclVariadicOpCmd,	TclCompileMulOpCmd,
		/* identity */ {1},	NULL},
    { "&",	TclVariadicOpCmd,	TclCompileAndOpCmd,
		/* identity */ {-1},	NULL},
    { "|",	TclVariadicOpCmd,	TclCompileOrOpCmd,
		/* identity */ {0},	NULL},
    { "^",	TclVariadicOpCmd,	TclCompileXorOpCmd,
		/* identity */ {0},	NULL},
    { "**",	TclVariadicOpCmd,	TclCompilePowOpCmd,
		/* identity */ {1},	NULL},
    { "<<",	TclSingleOpCmd,		TclCompileLshiftOpCmd,
		/* numArgs */ {2},	"integer shift"},
    { ">>",	TclSingleOpCmd,		TclCompileRshiftOpCmd,
		/* numArgs */ {2},	"integer shift"},
    { "%",	TclSingleOpCmd,		TclCompileModOpCmd,
		/* numArgs */ {2},	"integer integer"},
    { "!=",	TclSingleOpCmd,		TclCompileNeqOpCmd,
		/* numArgs */ {2},	"value value"},
    { "ne",	TclSingleOpCmd,		TclCompileStrneqOpCmd,
		/* numArgs */ {2},	"value value"},
    { "in",	TclSingleOpCmd,		TclCompileInOpCmd,
		/* numArgs */ {2},	"value list"},
    { "ni",	TclSingleOpCmd,		TclCompileNiOpCmd,
		/* numArgs */ {2},	"value list"},
    { "-",	TclNoIdentOpCmd,	TclCompileMinusOpCmd,
		/* unused */ {0},	"value ?value ...?"},
    { "/",	TclNoIdentOpCmd,	TclCompileDivOpCmd,
		/* unused */ {0},	"value ?value ...?"},
    { "<",	TclSortingOpCmd,	TclCompileLessOpCmd,
		/* unused */ {0},	NULL},
    { "<=",	TclSortingOpCmd,	TclCompileLeqOpCmd,
		/* unused */ {0},	NULL},
    { ">",	TclSortingOpCmd,	TclCompileGreaterOpCmd,
		/* unused */ {0},	NULL},
    { ">=",	TclSortingOpCmd,	TclCompileGeqOpCmd,
		/* unused */ {0},	NULL},
    { "==",	TclSortingOpCmd,	TclCompileEqOpCmd,
		/* unused */ {0},	NULL},
    { "eq",	TclSortingOpCmd,	TclCompileStreqOpCmd,
		/* unused */ {0},	NULL},
    { NULL,	NULL,			NULL,
		{0},			NULL}
};

/*
 * This is the script cancellation struct and hash table. The hash table is
 * used to keep track of the information necessary to process script
 * cancellation requests, including the original interp, asynchronous handler
 * tokens (created by Tcl_AsyncCreate), and the clientData and flags arguments
 * passed to Tcl_CancelEval on a per-interp basis. The cancelLock mutex is
 * used for protecting calls to Tcl_CancelEval as well as protecting access to
 * the hash table below.
 */

typedef struct {
    Tcl_Interp *interp;		/* Interp this struct belongs to */
    Tcl_AsyncHandler async;	/* Async handler token for script
				 * cancellation */
    char *result;		/* The script cancellation result or
				 * NULL for a default result */
    int length;			/* Length of the above error message */
    ClientData clientData;	/* Ignored */
    int flags;			/* Additional flags */
} CancelInfo;
static Tcl_HashTable cancelTable;
static int cancelTableInitialized = 0;	/* 0 means not yet initialized. */
TCL_DECLARE_MUTEX(cancelLock)

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeEvaluation --
 *
 *	Finalizes the script cancellation hash table.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeEvaluation(void)
{
    Tcl_MutexLock(&cancelLock);
    if (cancelTableInitialized == 1) {
	Tcl_DeleteHashTable(&cancelTable);
	cancelTableInitialized = 0;
    }
    Tcl_MutexUnlock(&cancelLock);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateInterp --
 *
 *	Create a new TCL command interpreter.
 *
 * Results:
 *	The return value is a token for the interpreter, which may be used in
 *	calls to functions like Tcl_CreateCmd, Tcl_Eval, or Tcl_DeleteInterp.
 *
 * Side effects:
 *	The command interpreter is initialized with the built-in commands and
 *	with the variables documented in tclvars(n).
 *
 *----------------------------------------------------------------------
 */

Tcl_Interp *
Tcl_CreateInterp(void)
{
    Interp *iPtr;
    Tcl_Interp *interp;
    Command *cmdPtr;
    const BuiltinFuncDef *builtinFuncPtr;
    const OpCmdInfo *opcmdInfoPtr;
    const CmdInfo *cmdInfoPtr;
    Tcl_Namespace *mathfuncNSPtr, *mathopNSPtr;
    Tcl_HashEntry *hPtr;
    int isNew;
    CancelInfo *cancelInfo;
    union {
	char c[sizeof(short)];
	short s;
    } order;
#ifdef TCL_COMPILE_STATS
    ByteCodeStats *statsPtr;
#endif /* TCL_COMPILE_STATS */
    char mathFuncName[32];
    CallFrame *framePtr;
    int result;

    TclInitSubsystems();

    /*
     * Panic if someone updated the CallFrame structure without also updating
     * the Tcl_CallFrame structure (or vice versa).
     */

    if (sizeof(Tcl_CallFrame) != sizeof(CallFrame)) {
	/*NOTREACHED*/
	Tcl_Panic("Tcl_CallFrame and CallFrame are not the same size");
    }

    if (cancelTableInitialized == 0) {
	Tcl_MutexLock(&cancelLock);
	if (cancelTableInitialized == 0) {
	    Tcl_InitHashTable(&cancelTable, TCL_ONE_WORD_KEYS);
	    cancelTableInitialized = 1;
	}
	Tcl_MutexUnlock(&cancelLock);
    }

    /*
     * Initialize support for namespaces and create the global namespace
     * (whose name is ""; an alias is "::"). This also initializes the Tcl
     * object type table and other object management code.
     */

    iPtr = (Interp *) ckalloc(sizeof(Interp));
    interp = (Tcl_Interp *) iPtr;

    iPtr->result = iPtr->resultSpace;
    iPtr->freeProc = NULL;
    iPtr->errorLine = 0;
    iPtr->objResultPtr = Tcl_NewObj();
    Tcl_IncrRefCount(iPtr->objResultPtr);
    iPtr->handle = TclHandleCreate(iPtr);
    iPtr->globalNsPtr = NULL;
    iPtr->hiddenCmdTablePtr = NULL;
    iPtr->interpInfo = NULL;

    iPtr->numLevels = 0;
    iPtr->maxNestingDepth = MAX_NESTING_DEPTH;
    iPtr->framePtr = NULL;	/* Initialise as soon as :: is available */
    iPtr->varFramePtr = NULL;	/* Initialise as soon as :: is available */

    /*
     * TIP #280 - Initialize the arrays used to extend the ByteCode and
     * Proc structures.
     */

    iPtr->cmdFramePtr = NULL;
    iPtr->linePBodyPtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineBCPtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineLAPtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
    iPtr->lineLABCPtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
    Tcl_InitHashTable(iPtr->linePBodyPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineBCPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineLAPtr, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(iPtr->lineLABCPtr, TCL_ONE_WORD_KEYS);

    iPtr->activeVarTracePtr = NULL;

    iPtr->returnOpts = NULL;
    iPtr->errorInfo = NULL;
    TclNewLiteralStringObj(iPtr->eiVar, "::errorInfo");
    Tcl_IncrRefCount(iPtr->eiVar);
    iPtr->errorCode = NULL;
    TclNewLiteralStringObj(iPtr->ecVar, "::errorCode");
    Tcl_IncrRefCount(iPtr->ecVar);
    iPtr->returnLevel = 1;
    iPtr->returnCode = TCL_OK;

    iPtr->rootFramePtr = NULL;	/* Initialise as soon as :: is available */
    iPtr->lookupNsPtr = NULL;

    iPtr->appendResult = NULL;
    iPtr->appendAvl = 0;
    iPtr->appendUsed = 0;

    Tcl_InitHashTable(&iPtr->packageTable, TCL_STRING_KEYS);
    iPtr->packageUnknown = NULL;

    /* TIP #268 */
    if (getenv("TCL_PKG_PREFER_LATEST") == NULL) {
	iPtr->packagePrefer = PKG_PREFER_STABLE;
    } else {
	iPtr->packagePrefer = PKG_PREFER_LATEST;
    }

    iPtr->cmdCount = 0;
    TclInitLiteralTable(&(iPtr->literalTable));
    iPtr->compileEpoch = 0;
    iPtr->compiledProcPtr = NULL;
    iPtr->resolverPtr = NULL;
    iPtr->evalFlags = 0;
    iPtr->scriptFile = NULL;
    iPtr->flags = 0;
    iPtr->tracePtr = NULL;
    iPtr->tracesForbiddingInline = 0;
    iPtr->activeCmdTracePtr = NULL;
    iPtr->activeInterpTracePtr = NULL;
    iPtr->assocData = NULL;
    iPtr->execEnvPtr = NULL;	/* Set after namespaces initialized. */
    iPtr->emptyObjPtr = Tcl_NewObj();
				/* Another empty object. */
    Tcl_IncrRefCount(iPtr->emptyObjPtr);
    iPtr->resultSpace[0] = 0;
    iPtr->threadId = Tcl_GetCurrentThread();

    /*
     * Initialise the tables for variable traces and searches *before*
     * creating the global ns - so that the trace on errorInfo can be
     * recorded.
     */

    Tcl_InitHashTable(&iPtr->varTraces, TCL_ONE_WORD_KEYS);
    Tcl_InitHashTable(&iPtr->varSearches, TCL_ONE_WORD_KEYS);

    iPtr->globalNsPtr = NULL;	/* Force creation of global ns below. */
    iPtr->globalNsPtr = (Namespace *) Tcl_CreateNamespace(interp, "",
	    NULL, NULL);
    if (iPtr->globalNsPtr == NULL) {
	Tcl_Panic("Tcl_CreateInterp: can't create global namespace");
    }

    /*
     * Initialise the rootCallframe. It cannot be allocated on the stack, as
     * it has to be in place before TclCreateExecEnv tries to use a variable.
     */

    /* This is needed to satisfy GCC 3.3's strict aliasing rules */
    framePtr = (CallFrame *) ckalloc(sizeof(CallFrame));
    result = Tcl_PushCallFrame(interp, (Tcl_CallFrame *) framePtr,
	    (Tcl_Namespace *) iPtr->globalNsPtr, /*isProcCallFrame*/ 0);
    if (result != TCL_OK) {
	Tcl_Panic("Tcl_CreateInterp: failed to push the root stack frame");
    }
    framePtr->objc = 0;

    iPtr->framePtr = framePtr;
    iPtr->varFramePtr = framePtr;
    iPtr->rootFramePtr = framePtr;

    /*
     * Initialize support for code compilation and execution. We call
     * TclCreateExecEnv after initializing namespaces since it tries to
     * reference a Tcl variable (it links to the Tcl "tcl_traceExec"
     * variable).
     */

    iPtr->execEnvPtr = TclCreateExecEnv(interp);

    /*
     * TIP #219, Tcl Channel Reflection API support.
     */

    iPtr->chanMsg = NULL;

    /*
     * TIP #285, Script cancellation support.
     */

    iPtr->asyncCancelMsg = Tcl_NewObj();

    cancelInfo = (CancelInfo *) ckalloc(sizeof(CancelInfo));
    cancelInfo->interp = interp;

    iPtr->asyncCancel = Tcl_AsyncCreate(CancelEvalProc, cancelInfo);
    cancelInfo->async = iPtr->asyncCancel;
    cancelInfo->result = NULL;
    cancelInfo->length = 0;

    Tcl_MutexLock(&cancelLock);
    hPtr = Tcl_CreateHashEntry(&cancelTable, (char *) iPtr, &isNew);
    Tcl_SetHashValue(hPtr, cancelInfo);
    Tcl_MutexUnlock(&cancelLock);

    /*
     * Initialize the compilation and execution statistics kept for this
     * interpreter.
     */

#ifdef TCL_COMPILE_STATS
    statsPtr = &(iPtr->stats);
    statsPtr->numExecutions = 0;
    statsPtr->numCompilations = 0;
    statsPtr->numByteCodesFreed = 0;
    memset(statsPtr->instructionCount, 0,
	    sizeof(statsPtr->instructionCount));

    statsPtr->totalSrcBytes = 0.0;
    statsPtr->totalByteCodeBytes = 0.0;
    statsPtr->currentSrcBytes = 0.0;
    statsPtr->currentByteCodeBytes = 0.0;
    memset(statsPtr->srcCount, 0, sizeof(statsPtr->srcCount));
    memset(statsPtr->byteCodeCount, 0, sizeof(statsPtr->byteCodeCount));
    memset(statsPtr->lifetimeCount, 0, sizeof(statsPtr->lifetimeCount));

    statsPtr->currentInstBytes = 0.0;
    statsPtr->currentLitBytes = 0.0;
    statsPtr->currentExceptBytes = 0.0;
    statsPtr->currentAuxBytes = 0.0;
    statsPtr->currentCmdMapBytes = 0.0;

    statsPtr->numLiteralsCreated = 0;
    statsPtr->totalLitStringBytes = 0.0;
    statsPtr->currentLitStringBytes = 0.0;
    memset(statsPtr->literalCount, 0, sizeof(statsPtr->literalCount));
#endif /* TCL_COMPILE_STATS */

    /*
     * Initialise the stub table pointer.
     */

    iPtr->stubTable = tclConstStubsPtr;

    /*
     * Initialize the ensemble error message rewriting support.
     */

    iPtr->ensembleRewrite.sourceObjs = NULL;
    iPtr->ensembleRewrite.numRemovedObjs = 0;
    iPtr->ensembleRewrite.numInsertedObjs = 0;

    /*
     * TIP#143: Initialise the resource limit support.
     */

    TclInitLimitSupport(interp);

    /*
     * Initialise the thread-specific data ekeko. Note that the thread's alloc
     * cache was already initialised by the call to alloc the interp struct.
     */

#if defined(TCL_THREADS) && defined(USE_THREAD_ALLOC)
    iPtr->allocCache = TclpGetAllocCache();
#else
    iPtr->allocCache = NULL;
#endif
    iPtr->pendingObjDataPtr = NULL;
    iPtr->asyncReadyPtr = TclGetAsyncReadyPtr();
    iPtr->atExitPtr = NULL;

    /*
     * Create the core commands. Do it here, rather than calling
     * Tcl_CreateCommand, because it's faster (there's no need to check for a
     * pre-existing command by the same name). If a command has a Tcl_CmdProc
     * but no Tcl_ObjCmdProc, set the Tcl_ObjCmdProc to
     * TclInvokeStringCommand. This is an object-based wrapper function that
     * extracts strings, calls the string function, and creates an object for
     * the result. Similarly, if a command has a Tcl_ObjCmdProc but no
     * Tcl_CmdProc, set the Tcl_CmdProc to TclInvokeObjectCommand.
     */

    for (cmdInfoPtr = builtInCmds;  cmdInfoPtr->name != NULL; cmdInfoPtr++) {
	if ((cmdInfoPtr->objProc == NULL)
		&& (cmdInfoPtr->compileProc == NULL)
		&& (cmdInfoPtr->nreProc == NULL)) {
	    Tcl_Panic("builtin command with NULL object command proc and a NULL compile proc");
	}

	hPtr = Tcl_CreateHashEntry(&iPtr->globalNsPtr->cmdTable,
		cmdInfoPtr->name, &isNew);
	if (isNew) {
	    cmdPtr = (Command *) ckalloc(sizeof(Command));
	    cmdPtr->hPtr = hPtr;
	    cmdPtr->nsPtr = iPtr->globalNsPtr;
	    cmdPtr->refCount = 1;
	    cmdPtr->cmdEpoch = 0;
	    cmdPtr->compileProc = cmdInfoPtr->compileProc;
	    cmdPtr->proc = TclInvokeObjectCommand;
	    cmdPtr->clientData = cmdPtr;
	    cmdPtr->objProc = cmdInfoPtr->objProc;
	    cmdPtr->objClientData = NULL;
	    cmdPtr->deleteProc = NULL;
	    cmdPtr->deleteData = NULL;
	    cmdPtr->flags = 0;
	    cmdPtr->importRefPtr = NULL;
	    cmdPtr->tracePtr = NULL;
	    cmdPtr->nreProc = cmdInfoPtr->nreProc;
	    Tcl_SetHashValue(hPtr, cmdPtr);
	}
    }

    /*
     * Create the "binary", "chan", "dict", "info" and "string" ensembles.
     * Note that all these commands (and their subcommands that are not
     * present in the global namespace) are wholly safe.
     */

    TclInitBinaryCmd(interp);
    TclInitChanCmd(interp);
    TclInitDictCmd(interp);
    TclInitInfoCmd(interp);
    TclInitStringCmd(interp);
    TclInitPrefixCmd(interp);

    /*
     * Register "clock" subcommands. These *do* go through
     * Tcl_CreateObjCommand, since they aren't in the global namespace and
     * involve ensembles.
     */

    TclClockInit(interp);

    /*
     * Register the built-in functions. This is empty now that they are
     * implemented as commands in the ::tcl::mathfunc namespace.
     */

    /*
     * Register the default [interp bgerror] handler.
     */

    Tcl_CreateObjCommand(interp, "::tcl::Bgerror",
	    TclDefaultBgErrorHandlerObjCmd, NULL, NULL);

    /*
     * Create an unsupported command for debugging bytecode.
     */

    Tcl_CreateObjCommand(interp, "::tcl::unsupported::disassemble",
	    Tcl_DisassembleObjCmd, NULL, NULL);

    /*
     * Create the 'tailcall' command an unsupported command for 'atProcExit'
     */

    Tcl_NRCreateCommand(interp, "tailcall",
	    /*objProc*/ NULL, TclNRAtProcExitObjCmd, INT2PTR(TCL_NR_TAILCALL_TYPE),
	    NULL);

    Tcl_NRCreateCommand(interp, "::tcl::unsupported::atProcExit",
	    /*objProc*/ NULL, TclNRAtProcExitObjCmd, INT2PTR(TCL_NR_ATEXIT_TYPE),
	    NULL);

#ifdef USE_DTRACE
    /*
     * Register the tcl::dtrace command.
     */

    Tcl_CreateObjCommand(interp, "::tcl::dtrace", DTraceObjCmd, NULL, NULL);
#endif /* USE_DTRACE */

    /*
     * Register the builtin math functions.
     */

    mathfuncNSPtr = Tcl_CreateNamespace(interp, "::tcl::mathfunc", NULL,NULL);
    if (mathfuncNSPtr == NULL) {
	Tcl_Panic("Can't create math function namespace");
    }
    strcpy(mathFuncName, "::tcl::mathfunc::");
#define MATH_FUNC_PREFIX_LEN 17 /* == strlen("::tcl::mathfunc::") */
    for (builtinFuncPtr = BuiltinFuncTable; builtinFuncPtr->name != NULL;
	    builtinFuncPtr++) {
	strcpy(mathFuncName+MATH_FUNC_PREFIX_LEN, builtinFuncPtr->name);
	Tcl_CreateObjCommand(interp, mathFuncName,
		builtinFuncPtr->objCmdProc, builtinFuncPtr->clientData, NULL);
	Tcl_Export(interp, mathfuncNSPtr, builtinFuncPtr->name, 0);
    }

    /*
     * Register the mathematical "operator" commands. [TIP #174]
     */

    mathopNSPtr = Tcl_CreateNamespace(interp, "::tcl::mathop", NULL, NULL);
#define MATH_OP_PREFIX_LEN 15 /* == strlen("::tcl::mathop::") */
    if (mathopNSPtr == NULL) {
	Tcl_Panic("can't create math operator namespace");
    }
    Tcl_Export(interp, mathopNSPtr, "*", 1);
    strcpy(mathFuncName, "::tcl::mathop::");
    for (opcmdInfoPtr=mathOpCmds ; opcmdInfoPtr->name!=NULL ; opcmdInfoPtr++){
	TclOpCmdClientData *occdPtr = (TclOpCmdClientData *)
		ckalloc(sizeof(TclOpCmdClientData));

	occdPtr->op = opcmdInfoPtr->name;
	occdPtr->i.numArgs = opcmdInfoPtr->i.numArgs;
	occdPtr->expected = opcmdInfoPtr->expected;
	strcpy(mathFuncName + MATH_OP_PREFIX_LEN, opcmdInfoPtr->name);
	cmdPtr = (Command *) Tcl_CreateObjCommand(interp, mathFuncName,
		opcmdInfoPtr->objProc, occdPtr, DeleteOpCmdClientData);
	if (cmdPtr == NULL) {
	    Tcl_Panic("failed to create math operator %s",
		    opcmdInfoPtr->name);
	} else if (opcmdInfoPtr->compileProc != NULL) {
	    cmdPtr->compileProc = opcmdInfoPtr->compileProc;
	}
    }

    /*
     * Do Multiple/Safe Interps Tcl init stuff
     */

    TclInterpInit(interp);
    TclSetupEnv(interp);

    /*
     * TIP #59: Make embedded configuration information available.
     */

    TclInitEmbeddedConfigurationInformation(interp);

    /*
     * Compute the byte order of this machine.
     */

    order.s = 1;
    Tcl_SetVar2(interp, "tcl_platform", "byteOrder",
	    ((order.c[0] == 1) ? "littleEndian" : "bigEndian"),
	    TCL_GLOBAL_ONLY);

    Tcl_SetVar2Ex(interp, "tcl_platform", "wordSize",
	    Tcl_NewLongObj((long) sizeof(long)), TCL_GLOBAL_ONLY);

    /* TIP #291 */
    Tcl_SetVar2Ex(interp, "tcl_platform", "pointerSize",
	    Tcl_NewLongObj((long) sizeof(void *)), TCL_GLOBAL_ONLY);

    /*
     * Set up other variables such as tcl_version and tcl_library
     */

    Tcl_SetVar(interp, "tcl_patchLevel", TCL_PATCH_LEVEL, TCL_GLOBAL_ONLY);
    Tcl_SetVar(interp, "tcl_version", TCL_VERSION, TCL_GLOBAL_ONLY);
    Tcl_TraceVar2(interp, "tcl_precision", NULL,
	    TCL_GLOBAL_ONLY|TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
	    TclPrecTraceProc, NULL);
    TclpSetVariables(interp);

#ifdef TCL_THREADS
    /*
     * The existence of the "threaded" element of the tcl_platform array
     * indicates that this particular Tcl shell has been compiled with threads
     * turned on. Using "info exists tcl_platform(threaded)" a Tcl script can
     * introspect on the interpreter level of thread safety.
     */

    Tcl_SetVar2(interp, "tcl_platform", "threaded", "1", TCL_GLOBAL_ONLY);
#endif

    /*
     * Register Tcl's version number.
     * TIP #268: Full patchlevel instead of just major.minor
     */

    Tcl_PkgProvideEx(interp, "Tcl", TCL_PATCH_LEVEL,
	    (ClientData) tclConstStubsPtr);

    if (TclTommath_Init(interp) != TCL_OK) {
	Tcl_Panic(Tcl_GetString(Tcl_GetObjResult(interp)));
    }

    if (TclOOInit(interp) != TCL_OK) {
	Tcl_Panic(Tcl_GetString(Tcl_GetObjResult(interp)));
    }

    /*
     * Only build in zlib support if we've successfully detected a library to
     * compile and link against.
     */

#ifdef HAVE_ZLIB
    if (TclZlibInit(interp) != TCL_OK) {
	Tcl_Panic(Tcl_GetString(Tcl_GetObjResult(interp)));
    }
#endif

    TOP_CB(iPtr) = NULL;
    return interp;
}

static void
DeleteOpCmdClientData(
    ClientData clientData)
{
    TclOpCmdClientData *occdPtr = clientData;

    ckfree((char *) occdPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclHideUnsafeCommands --
 *
 *	Hides base commands that are not marked as safe from this interpreter.
 *
 * Results:
 *	TCL_OK if it succeeds, TCL_ERROR else.
 *
 * Side effects:
 *	Hides functionality in an interpreter.
 *
 *----------------------------------------------------------------------
 */

int
TclHideUnsafeCommands(
    Tcl_Interp *interp)		/* Hide commands in this interpreter. */
{
    register const CmdInfo *cmdInfoPtr;

    if (interp == NULL) {
	return TCL_ERROR;
    }
    for (cmdInfoPtr = builtInCmds; cmdInfoPtr->name != NULL; cmdInfoPtr++) {
	if (!cmdInfoPtr->isSafe) {
	    Tcl_HideCommand(interp, cmdInfoPtr->name, cmdInfoPtr->name);
	}
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_CallWhenDeleted --
 *
 *	Arrange for a function to be called before a given interpreter is
 *	deleted. The function is called as soon as Tcl_DeleteInterp is called;
 *	if Tcl_CallWhenDeleted is called on an interpreter that has already
 *	been deleted, the function will be called when the last Tcl_Release is
 *	done on the interpreter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When Tcl_DeleteInterp is invoked to delete interp, proc will be
 *	invoked. See the manual entry for details.
 *
 *--------------------------------------------------------------
 */

void
Tcl_CallWhenDeleted(
    Tcl_Interp *interp,		/* Interpreter to watch. */
    Tcl_InterpDeleteProc *proc,	/* Function to call when interpreter is about
				 * to be deleted. */
    ClientData clientData)	/* One-word value to pass to proc. */
{
    Interp *iPtr = (Interp *) interp;
    static Tcl_ThreadDataKey assocDataCounterKey;
    int *assocDataCounterPtr =
	    Tcl_GetThreadData(&assocDataCounterKey, (int)sizeof(int));
    int isNew;
    char buffer[32 + TCL_INTEGER_SPACE];
    AssocData *dPtr = (AssocData *) ckalloc(sizeof(AssocData));
    Tcl_HashEntry *hPtr;

    sprintf(buffer, "Assoc Data Key #%d", *assocDataCounterPtr);
    (*assocDataCounterPtr)++;

    if (iPtr->assocData == NULL) {
	iPtr->assocData = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
	Tcl_InitHashTable(iPtr->assocData, TCL_STRING_KEYS);
    }
    hPtr = Tcl_CreateHashEntry(iPtr->assocData, buffer, &isNew);
    dPtr->proc = proc;
    dPtr->clientData = clientData;
    Tcl_SetHashValue(hPtr, dPtr);
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_DontCallWhenDeleted --
 *
 *	Cancel the arrangement for a function to be called when a given
 *	interpreter is deleted.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If proc and clientData were previously registered as a callback via
 *	Tcl_CallWhenDeleted, they are unregistered. If they weren't previously
 *	registered then nothing happens.
 *
 *--------------------------------------------------------------
 */

void
Tcl_DontCallWhenDeleted(
    Tcl_Interp *interp,		/* Interpreter to watch. */
    Tcl_InterpDeleteProc *proc,	/* Function to call when interpreter is about
				 * to be deleted. */
    ClientData clientData)	/* One-word value to pass to proc. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashTable *hTablePtr;
    Tcl_HashSearch hSearch;
    Tcl_HashEntry *hPtr;
    AssocData *dPtr;

    hTablePtr = iPtr->assocData;
    if (hTablePtr == NULL) {
	return;
    }
    for (hPtr = Tcl_FirstHashEntry(hTablePtr, &hSearch); hPtr != NULL;
	    hPtr = Tcl_NextHashEntry(&hSearch)) {
	dPtr = Tcl_GetHashValue(hPtr);
	if ((dPtr->proc == proc) && (dPtr->clientData == clientData)) {
	    ckfree((char *) dPtr);
	    Tcl_DeleteHashEntry(hPtr);
	    return;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetAssocData --
 *
 *	Creates a named association between user-specified data, a delete
 *	function and this interpreter. If the association already exists the
 *	data is overwritten with the new data. The delete function will be
 *	invoked when the interpreter is deleted.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Sets the associated data, creates the association if needed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SetAssocData(
    Tcl_Interp *interp,		/* Interpreter to associate with. */
    const char *name,		/* Name for association. */
    Tcl_InterpDeleteProc *proc,	/* Proc to call when interpreter is about to
				 * be deleted. */
    ClientData clientData)	/* One-word value to pass to proc. */
{
    Interp *iPtr = (Interp *) interp;
    AssocData *dPtr;
    Tcl_HashEntry *hPtr;
    int isNew;

    if (iPtr->assocData == NULL) {
	iPtr->assocData = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
	Tcl_InitHashTable(iPtr->assocData, TCL_STRING_KEYS);
    }
    hPtr = Tcl_CreateHashEntry(iPtr->assocData, name, &isNew);
    if (isNew == 0) {
	dPtr = Tcl_GetHashValue(hPtr);
    } else {
	dPtr = (AssocData *) ckalloc(sizeof(AssocData));
    }
    dPtr->proc = proc;
    dPtr->clientData = clientData;

    Tcl_SetHashValue(hPtr, dPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteAssocData --
 *
 *	Deletes a named association of user-specified data with the specified
 *	interpreter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deletes the association.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteAssocData(
    Tcl_Interp *interp,		/* Interpreter to associate with. */
    const char *name)		/* Name of association. */
{
    Interp *iPtr = (Interp *) interp;
    AssocData *dPtr;
    Tcl_HashEntry *hPtr;

    if (iPtr->assocData == NULL) {
	return;
    }
    hPtr = Tcl_FindHashEntry(iPtr->assocData, name);
    if (hPtr == NULL) {
	return;
    }
    dPtr = Tcl_GetHashValue(hPtr);
    if (dPtr->proc != NULL) {
	dPtr->proc(dPtr->clientData, interp);
    }
    ckfree((char *) dPtr);
    Tcl_DeleteHashEntry(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetAssocData --
 *
 *	Returns the client data associated with this name in the specified
 *	interpreter.
 *
 * Results:
 *	The client data in the AssocData record denoted by the named
 *	association, or NULL.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_GetAssocData(
    Tcl_Interp *interp,		/* Interpreter associated with. */
    const char *name,		/* Name of association. */
    Tcl_InterpDeleteProc **procPtr)
				/* Pointer to place to store address of
				 * current deletion callback. */
{
    Interp *iPtr = (Interp *) interp;
    AssocData *dPtr;
    Tcl_HashEntry *hPtr;

    if (iPtr->assocData == NULL) {
	return NULL;
    }
    hPtr = Tcl_FindHashEntry(iPtr->assocData, name);
    if (hPtr == NULL) {
	return NULL;
    }
    dPtr = Tcl_GetHashValue(hPtr);
    if (procPtr != NULL) {
	*procPtr = dPtr->proc;
    }
    return dPtr->clientData;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InterpDeleted --
 *
 *	Returns nonzero if the interpreter has been deleted with a call to
 *	Tcl_DeleteInterp.
 *
 * Results:
 *	Nonzero if the interpreter is deleted, zero otherwise.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_InterpDeleted(
    Tcl_Interp *interp)
{
    return (((Interp *) interp)->flags & DELETED) ? 1 : 0;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteInterp --
 *
 *	Ensures that the interpreter will be deleted eventually. If there are
 *	no Tcl_Preserve calls in effect for this interpreter, it is deleted
 *	immediately, otherwise the interpreter is deleted when the last
 *	Tcl_Preserve is matched by a call to Tcl_Release. In either case, the
 *	function runs the currently registered deletion callbacks.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The interpreter is marked as deleted. The caller may still use it
 *	safely if there are calls to Tcl_Preserve in effect for the
 *	interpreter, but further calls to Tcl_Eval etc in this interpreter
 *	will fail.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteInterp(
    Tcl_Interp *interp)		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
{
    Interp *iPtr = (Interp *) interp;

    /*
     * If the interpreter has already been marked deleted, just punt.
     */

    if (iPtr->flags & DELETED) {
	return;
    }

    /*
     * Mark the interpreter as deleted. No further evals will be allowed.
     * Increase the compileEpoch as a signal to compiled bytecodes.
     */

    iPtr->flags |= DELETED;
    iPtr->compileEpoch++;

    /*
     * Ensure that the interpreter is eventually deleted.
     */

    Tcl_EventuallyFree(interp, (Tcl_FreeProc *) DeleteInterpProc);
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteInterpProc --
 *
 *	Helper function to delete an interpreter. This function is called when
 *	the last call to Tcl_Preserve on this interpreter is matched by a call
 *	to Tcl_Release. The function cleans up all resources used in the
 *	interpreter and calls all currently registered interpreter deletion
 *	callbacks.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Whatever the interpreter deletion callbacks do. Frees resources used
 *	by the interpreter.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteInterpProc(
    Tcl_Interp *interp)		/* Interpreter to delete. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;
    Tcl_HashTable *hTablePtr;
    ResolverScheme *resPtr, *nextResPtr;

    /*
     * Punt if there is an error in the Tcl_Release/Tcl_Preserve matchup.
     */

    if (iPtr->numLevels > 0) {
	Tcl_Panic("DeleteInterpProc called with active evals");
    }

    /*
     * The interpreter should already be marked deleted; otherwise how did we
     * get here?
     */

    if (!(iPtr->flags & DELETED)) {
	Tcl_Panic("DeleteInterpProc called on interpreter not marked deleted");
    }

    /*
     * TIP #219, Tcl Channel Reflection API. Discard a leftover state.
     */

    if (iPtr->chanMsg != NULL) {
	Tcl_DecrRefCount(iPtr->chanMsg);
	iPtr->chanMsg = NULL;
    }

    /*
     * TIP #285, Script cancellation support. Delete this interp from the
     * global hash table of CancelInfo structs.
     */

    Tcl_MutexLock(&cancelLock);
    hPtr = Tcl_FindHashEntry(&cancelTable, (char *) iPtr);
    if (hPtr != NULL) {
	CancelInfo *cancelInfo = Tcl_GetHashValue(hPtr);

	if (cancelInfo != NULL) {
	    if (cancelInfo->result != NULL) {
		ckfree((char *) cancelInfo->result);
	    }
	    ckfree((char *) cancelInfo);
	}

	Tcl_DeleteHashEntry(hPtr);
    }

    if (iPtr->asyncCancel != NULL) {
	Tcl_AsyncDelete(iPtr->asyncCancel);
	iPtr->asyncCancel = NULL;
    }

    if (iPtr->asyncCancelMsg != NULL) {
	Tcl_DecrRefCount(iPtr->asyncCancelMsg);
	iPtr->asyncCancelMsg = NULL;
    }
    Tcl_MutexUnlock(&cancelLock);

    /*
     * Shut down all limit handler callback scripts that call back into this
     * interpreter. Then eliminate all limit handlers for this interpreter.
     */

    TclRemoveScriptLimitCallbacks(interp);
    TclLimitRemoveAllHandlers(interp);

    /*
     * Dismantle the namespace here, before we clear the assocData. If any
     * background errors occur here, they will be deleted below.
     *
     * Dismantle the namespace after freeing the iPtr->handle so that each
     * bytecode releases its literals without caring to update the literal
     * table, as it will be freed later in this function without further use.
     */

    TclCleanupLiteralTable(interp, &(iPtr->literalTable));
    TclHandleFree(iPtr->handle);
    TclTeardownNamespace(iPtr->globalNsPtr);

    /*
     * Delete all the hidden commands.
     */

    hTablePtr = iPtr->hiddenCmdTablePtr;
    if (hTablePtr != NULL) {
	/*
	 * Non-pernicious deletion. The deletion callbacks will not be allowed
	 * to create any new hidden or non-hidden commands.
	 * Tcl_DeleteCommandFromToken() will remove the entry from the
	 * hiddenCmdTablePtr.
	 */

	hPtr = Tcl_FirstHashEntry(hTablePtr, &search);
	for (; hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
	    Tcl_DeleteCommandFromToken(interp, Tcl_GetHashValue(hPtr));
	}
	Tcl_DeleteHashTable(hTablePtr);
	ckfree((char *) hTablePtr);
    }

    /*
     * Invoke deletion callbacks; note that a callback can create new
     * callbacks, so we iterate.
     */

    while (iPtr->assocData != NULL) {
	AssocData *dPtr;

	hTablePtr = iPtr->assocData;
	iPtr->assocData = NULL;
	for (hPtr = Tcl_FirstHashEntry(hTablePtr, &search);
		hPtr != NULL;
		hPtr = Tcl_FirstHashEntry(hTablePtr, &search)) {
	    dPtr = Tcl_GetHashValue(hPtr);
	    Tcl_DeleteHashEntry(hPtr);
	    if (dPtr->proc != NULL) {
		dPtr->proc(dPtr->clientData, interp);
	    }
	    ckfree((char *) dPtr);
	}
	Tcl_DeleteHashTable(hTablePtr);
	ckfree((char *) hTablePtr);
    }

    /*
     * Pop the root frame pointer and finish deleting the global
     * namespace. The order is important [Bug 1658572].
     */

    if (iPtr->framePtr != iPtr->rootFramePtr) {
	Tcl_Panic("DeleteInterpProc: popping rootCallFrame with other frames on top");
    }
    Tcl_PopCallFrame(interp);
    ckfree((char *) iPtr->rootFramePtr);
    iPtr->rootFramePtr = NULL;
    Tcl_DeleteNamespace((Tcl_Namespace *) iPtr->globalNsPtr);

    /*
     * Free up the result *after* deleting variables, since variable deletion
     * could have transferred ownership of the result string to Tcl.
     */

    Tcl_FreeResult(interp);
    iPtr->result = NULL;
    Tcl_DecrRefCount(iPtr->objResultPtr);
    iPtr->objResultPtr = NULL;
    Tcl_DecrRefCount(iPtr->ecVar);
    if (iPtr->errorCode) {
	Tcl_DecrRefCount(iPtr->errorCode);
	iPtr->errorCode = NULL;
    }
    Tcl_DecrRefCount(iPtr->eiVar);
    if (iPtr->errorInfo) {
	Tcl_DecrRefCount(iPtr->errorInfo);
	iPtr->errorInfo = NULL;
    }
    if (iPtr->returnOpts) {
	Tcl_DecrRefCount(iPtr->returnOpts);
    }
    if (iPtr->appendResult != NULL) {
	ckfree(iPtr->appendResult);
	iPtr->appendResult = NULL;
    }
    TclFreePackageInfo(iPtr);
    while (iPtr->tracePtr != NULL) {
	Tcl_DeleteTrace((Tcl_Interp *) iPtr, (Tcl_Trace) iPtr->tracePtr);
    }
    if (iPtr->execEnvPtr != NULL) {
	TclDeleteExecEnv(iPtr->execEnvPtr);
    }
    Tcl_DecrRefCount(iPtr->emptyObjPtr);
    iPtr->emptyObjPtr = NULL;

    resPtr = iPtr->resolverPtr;
    while (resPtr) {
	nextResPtr = resPtr->nextPtr;
	ckfree(resPtr->name);
	ckfree((char *) resPtr);
	resPtr = nextResPtr;
    }

    /*
     * Free up literal objects created for scripts compiled by the
     * interpreter.
     */

    TclDeleteLiteralTable(interp, &(iPtr->literalTable));

    /*
     * TIP #280 - Release the arrays for ByteCode/Proc extension, and
     * contents.
     */

    {
	Tcl_HashEntry *hPtr;
	Tcl_HashSearch hSearch;
	int i;

	for (hPtr = Tcl_FirstHashEntry(iPtr->linePBodyPtr, &hSearch);
		hPtr != NULL;
		hPtr = Tcl_NextHashEntry(&hSearch)) {
	    CmdFrame *cfPtr = Tcl_GetHashValue(hPtr);

	    if (cfPtr->type == TCL_LOCATION_SOURCE) {
		Tcl_DecrRefCount(cfPtr->data.eval.path);
	    }
	    ckfree((char *) cfPtr->line);
	    ckfree((char *) cfPtr);
	    Tcl_DeleteHashEntry(hPtr);
	}
	Tcl_DeleteHashTable(iPtr->linePBodyPtr);
	ckfree((char *) iPtr->linePBodyPtr);
	iPtr->linePBodyPtr = NULL;

	/*
	 * See also tclCompile.c, TclCleanupByteCode
	 */

	for (hPtr = Tcl_FirstHashEntry(iPtr->lineBCPtr, &hSearch);
		hPtr != NULL;
		hPtr = Tcl_NextHashEntry(&hSearch)) {
	    ExtCmdLoc *eclPtr = Tcl_GetHashValue(hPtr);

	    if (eclPtr->type == TCL_LOCATION_SOURCE) {
		Tcl_DecrRefCount(eclPtr->path);
	    }
	    for (i=0; i< eclPtr->nuloc; i++) {
		ckfree((char *) eclPtr->loc[i].line);
	    }

	    if (eclPtr->loc != NULL) {
		ckfree((char *) eclPtr->loc);
	    }

	    if (eclPtr->eiloc != NULL) {
		ckfree((char *) eclPtr->eiloc);
	    }

	    ckfree((char *) eclPtr);
	    Tcl_DeleteHashEntry(hPtr);
	}
	Tcl_DeleteHashTable(iPtr->lineBCPtr);
	ckfree((char *) iPtr->lineBCPtr);
	iPtr->lineBCPtr = NULL;

	/*
	 * Location stack for uplevel/eval/... scripts which were passed
	 * through proc arguments. Actually we track all arguments as we
	 * don't, cannot know which arguments will be used as scripts and
	 * which won't.
	 */

	if (iPtr->lineLAPtr->numEntries) {
	    /*
	     * When the interp goes away we have nothing on the stack, so
	     * there are no arguments, so this table has to be empty.
	     */

	    Tcl_Panic("Argument location tracking table not empty");
	}

	Tcl_DeleteHashTable(iPtr->lineLAPtr);
	ckfree((char *) iPtr->lineLAPtr);
	iPtr->lineLAPtr = NULL;

	if (iPtr->lineLABCPtr->numEntries) {
	    /*
	     * When the interp goes away we have nothing on the stack, so
	     * there are no arguments, so this table has to be empty.
	     */

	    Tcl_Panic("Argument location tracking table not empty");
	}

	Tcl_DeleteHashTable(iPtr->lineLABCPtr);
	ckfree((char *) iPtr->lineLABCPtr);
	iPtr->lineLABCPtr = NULL;
    }

    Tcl_DeleteHashTable(&iPtr->varTraces);
    Tcl_DeleteHashTable(&iPtr->varSearches);

    ckfree((char *) iPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_HideCommand --
 *
 *	Makes a command hidden so that it cannot be invoked from within an
 *	interpreter, only from within an ancestor.
 *
 * Results:
 *	A standard Tcl result; also leaves a message in the interp's result if
 *	an error occurs.
 *
 * Side effects:
 *	Removes a command from the command table and create an entry into the
 *	hidden command table under the specified token name.
 *
 *---------------------------------------------------------------------------
 */

int
Tcl_HideCommand(
    Tcl_Interp *interp,		/* Interpreter in which to hide command. */
    const char *cmdName,	/* Name of command to hide. */
    const char *hiddenCmdToken)	/* Token name of the to-be-hidden command. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Command cmd;
    Command *cmdPtr;
    Tcl_HashTable *hiddenCmdTablePtr;
    Tcl_HashEntry *hPtr;
    int isNew;

    if (iPtr->flags & DELETED) {
	/*
	 * The interpreter is being deleted. Do not create any new structures,
	 * because it is not safe to modify the interpreter.
	 */

	return TCL_ERROR;
    }

    /*
     * Disallow hiding of commands that are currently in a namespace or
     * renaming (as part of hiding) into a namespace (because the current
     * implementation with a single global table and the needed uniqueness of
     * names cause problems with namespaces).
     *
     * We don't need to check for "::" in cmdName because the real check is on
     * the nsPtr below.
     *
     * hiddenCmdToken is just a string which is not interpreted in any way. It
     * may contain :: but the string is not interpreted as a namespace
     * qualifier command name. Thus, hiding foo::bar to foo::bar and then
     * trying to expose or invoke ::foo::bar will NOT work; but if the
     * application always uses the same strings it will get consistent
     * behaviour.
     *
     * But as we currently limit ourselves to the global namespace only for
     * the source, in order to avoid potential confusion, lets prevent "::" in
     * the token too. - dl
     */

    if (strstr(hiddenCmdToken, "::") != NULL) {
	Tcl_AppendResult(interp,
		"cannot use namespace qualifiers in hidden command"
		" token (rename)", NULL);
	return TCL_ERROR;
    }

    /*
     * Find the command to hide. An error is returned if cmdName can't be
     * found. Look up the command only from the global namespace. Full path of
     * the command must be given if using namespaces.
     */

    cmd = Tcl_FindCommand(interp, cmdName, NULL,
	    /*flags*/ TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY);
    if (cmd == (Tcl_Command) NULL) {
	return TCL_ERROR;
    }
    cmdPtr = (Command *) cmd;

    /*
     * Check that the command is really in global namespace
     */

    if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
	Tcl_AppendResult(interp, "can only hide global namespace commands"
		" (use rename then hide)", NULL);
	return TCL_ERROR;
    }

    /*
     * Initialize the hidden command table if necessary.
     */

    hiddenCmdTablePtr = iPtr->hiddenCmdTablePtr;
    if (hiddenCmdTablePtr == NULL) {
	hiddenCmdTablePtr = (Tcl_HashTable *)
		ckalloc((unsigned) sizeof(Tcl_HashTable));
	Tcl_InitHashTable(hiddenCmdTablePtr, TCL_STRING_KEYS);
	iPtr->hiddenCmdTablePtr = hiddenCmdTablePtr;
    }

    /*
     * It is an error to move an exposed command to a hidden command with
     * hiddenCmdToken if a hidden command with the name hiddenCmdToken already
     * exists.
     */

    hPtr = Tcl_CreateHashEntry(hiddenCmdTablePtr, hiddenCmdToken, &isNew);
    if (!isNew) {
	Tcl_AppendResult(interp, "hidden command named \"", hiddenCmdToken,
		"\" already exists", NULL);
	return TCL_ERROR;
    }

    /*
     * NB: This code is currently 'like' a rename to a specialy set apart name
     * table. Changes here and in TclRenameCommand must be kept in synch until
     * the common parts are actually factorized out.
     */

    /*
     * Remove the hash entry for the command from the interpreter command
     * table. This is like deleting the command, so bump its command epoch;
     * this invalidates any cached references that point to the command.
     */

    if (cmdPtr->hPtr != NULL) {
	Tcl_DeleteHashEntry(cmdPtr->hPtr);
	cmdPtr->hPtr = NULL;
	cmdPtr->cmdEpoch++;
    }

    /*
     * The list of command exported from the namespace might have changed.
     * However, we do not need to recompute this just yet; next time we need
     * the info will be soon enough.
     */

    TclInvalidateNsCmdLookup(cmdPtr->nsPtr);

    /*
     * Now link the hash table entry with the command structure. We ensured
     * above that the nsPtr was right.
     */

    cmdPtr->hPtr = hPtr;
    Tcl_SetHashValue(hPtr, cmdPtr);

    /*
     * If the command being hidden has a compile function, increment the
     * interpreter's compileEpoch to invalidate its compiled code. This makes
     * sure that we don't later try to execute old code compiled with
     * command-specific (i.e., inline) bytecodes for the now-hidden command.
     * This field is checked in Tcl_EvalObj and ObjInterpProc, and code whose
     * compilation epoch doesn't match is recompiled.
     */

    if (cmdPtr->compileProc != NULL) {
	iPtr->compileEpoch++;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ExposeCommand --
 *
 *	Makes a previously hidden command callable from inside the interpreter
 *	instead of only by its ancestors.
 *
 * Results:
 *	A standard Tcl result. If an error occurs, a message is left in the
 *	interp's result.
 *
 * Side effects:
 *	Moves commands from one hash table to another.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_ExposeCommand(
    Tcl_Interp *interp,		/* Interpreter in which to make command
				 * callable. */
    const char *hiddenCmdToken,	/* Name of hidden command. */
    const char *cmdName)	/* Name of to-be-exposed command. */
{
    Interp *iPtr = (Interp *) interp;
    Command *cmdPtr;
    Namespace *nsPtr;
    Tcl_HashEntry *hPtr;
    Tcl_HashTable *hiddenCmdTablePtr;
    int isNew;

    if (iPtr->flags & DELETED) {
	/*
	 * The interpreter is being deleted. Do not create any new structures,
	 * because it is not safe to modify the interpreter.
	 */

	return TCL_ERROR;
    }

    /*
     * Check that we have a regular name for the command (that the user is not
     * trying to do an expose and a rename (to another namespace) at the same
     * time).
     */

    if (strstr(cmdName, "::") != NULL) {
	Tcl_AppendResult(interp, "cannot expose to a namespace "
		"(use expose to toplevel, then rename)", NULL);
	return TCL_ERROR;
    }

    /*
     * Get the command from the hidden command table:
     */

    hPtr = NULL;
    hiddenCmdTablePtr = iPtr->hiddenCmdTablePtr;
    if (hiddenCmdTablePtr != NULL) {
	hPtr = Tcl_FindHashEntry(hiddenCmdTablePtr, hiddenCmdToken);
    }
    if (hPtr == NULL) {
	Tcl_AppendResult(interp, "unknown hidden command \"", hiddenCmdToken,
		"\"", NULL);
	return TCL_ERROR;
    }
    cmdPtr = Tcl_GetHashValue(hPtr);

    /*
     * Check that we have a true global namespace command (enforced by
     * Tcl_HideCommand() but let's double check. (If it was not, we would not
     * really know how to handle it).
     */

    if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
	/*
	 * This case is theoritically impossible, we might rather Tcl_Panic()
	 * than 'nicely' erroring out ?
	 */

	Tcl_AppendResult(interp,
		"trying to expose a non global command name space command",
		NULL);
	return TCL_ERROR;
    }

    /*
     * This is the global table.
     */

    nsPtr = cmdPtr->nsPtr;

    /*
     * It is an error to overwrite an existing exposed command as a result of
     * exposing a previously hidden command.
     */

    hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, cmdName, &isNew);
    if (!isNew) {
	Tcl_AppendResult(interp, "exposed command \"", cmdName,
		"\" already exists", NULL);
	return TCL_ERROR;
    }

    /*
     * The list of command exported from the namespace might have changed.
     * However, we do not need to recompute this just yet; next time we need
     * the info will be soon enough.
     */

    TclInvalidateNsCmdLookup(nsPtr);

    /*
     * Remove the hash entry for the command from the interpreter hidden
     * command table.
     */

    if (cmdPtr->hPtr != NULL) {
	Tcl_DeleteHashEntry(cmdPtr->hPtr);
	cmdPtr->hPtr = NULL;
    }

    /*
     * Now link the hash table entry with the command structure. This is like
     * creating a new command, so deal with any shadowing of commands in the
     * global namespace.
     */

    cmdPtr->hPtr = hPtr;

    Tcl_SetHashValue(hPtr, cmdPtr);

    /*
     * Not needed as we are only in the global namespace (but would be needed
     * again if we supported namespace command hiding)
     *
     * TclResetShadowedCmdRefs(interp, cmdPtr);
     */

    /*
     * If the command being exposed has a compile function, increment
     * interpreter's compileEpoch to invalidate its compiled code. This makes
     * sure that we don't later try to execute old code compiled assuming the
     * command is hidden. This field is checked in Tcl_EvalObj and
     * ObjInterpProc, and code whose compilation epoch doesn't match is
     * recompiled.
     */

    if (cmdPtr->compileProc != NULL) {
	iPtr->compileEpoch++;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateCommand --
 *
 *	Define a new command in a command table.
 *
 * Results:
 *	The return value is a token for the command, which can be used in
 *	future calls to Tcl_GetCommandName.
 *
 * Side effects:
 *	If a command named cmdName already exists for interp, it is deleted.
 *	In the future, when cmdName is seen as the name of a command by
 *	Tcl_Eval, proc will be called. To support the bytecode interpreter,
 *	the command is created with a wrapper Tcl_ObjCmdProc
 *	(TclInvokeStringCommand) that eventially calls proc. When the command
 *	is deleted from the table, deleteProc will be called. See the manual
 *	entry for details on the calling sequence.
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
Tcl_CreateCommand(
    Tcl_Interp *interp,		/* Token for command interpreter returned by a
				 * previous call to Tcl_CreateInterp. */
    const char *cmdName,	/* Name of command. If it contains namespace
				 * qualifiers, the new command is put in the
				 * specified namespace; otherwise it is put in
				 * the global namespace. */
    Tcl_CmdProc *proc,		/* Function to associate with cmdName. */
    ClientData clientData,	/* Arbitrary value passed to string proc. */
    Tcl_CmdDeleteProc *deleteProc)
				/* If not NULL, gives a function to call when
				 * this command is deleted. */
{
    Interp *iPtr = (Interp *) interp;
    ImportRef *oldRefPtr = NULL;
    Namespace *nsPtr, *dummy1, *dummy2;
    Command *cmdPtr, *refCmdPtr;
    Tcl_HashEntry *hPtr;
    const char *tail;
    int isNew;
    ImportedCmdData *dataPtr;

    if (iPtr->flags & DELETED) {
	/*
	 * The interpreter is being deleted. Don't create any new commands;
	 * it's not safe to muck with the interpreter anymore.
	 */

	return (Tcl_Command) NULL;
    }

    /*
     * Determine where the command should reside. If its name contains
     * namespace qualifiers, we put it in the specified namespace; otherwise,
     * we always put it in the global namespace.
     */

    if (strstr(cmdName, "::") != NULL) {
	TclGetNamespaceForQualName(interp, cmdName, NULL,
		TCL_CREATE_NS_IF_UNKNOWN, &nsPtr, &dummy1, &dummy2, &tail);
	if ((nsPtr == NULL) || (tail == NULL)) {
	    return (Tcl_Command) NULL;
	}
    } else {
	nsPtr = iPtr->globalNsPtr;
	tail = cmdName;
    }

    hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &isNew);
    if (!isNew) {
	/*
	 * Command already exists. Delete the old one. Be careful to preserve
	 * any existing import links so we can restore them down below. That
	 * way, you can redefine a command and its import status will remain
	 * intact.
	 */

	cmdPtr = Tcl_GetHashValue(hPtr);
	oldRefPtr = cmdPtr->importRefPtr;
	cmdPtr->importRefPtr = NULL;

	Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
	hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &isNew);
	if (!isNew) {
	    /*
	     * If the deletion callback recreated the command, just throw away
	     * the new command (if we try to delete it again, we could get
	     * stuck in an infinite loop).
	     */

	     ckfree(Tcl_GetHashValue(hPtr));
	}
    } else {
	/*
	 * The list of command exported from the namespace might have changed.
	 * However, we do not need to recompute this just yet; next time we
	 * need the info will be soon enough.
	 */

	TclInvalidateNsCmdLookup(nsPtr);
	TclInvalidateNsPath(nsPtr);
    }
    cmdPtr = (Command *) ckalloc(sizeof(Command));
    Tcl_SetHashValue(hPtr, cmdPtr);
    cmdPtr->hPtr = hPtr;
    cmdPtr->nsPtr = nsPtr;
    cmdPtr->refCount = 1;
    cmdPtr->cmdEpoch = 0;
    cmdPtr->compileProc = NULL;
    cmdPtr->objProc = TclInvokeStringCommand;
    cmdPtr->objClientData = cmdPtr;
    cmdPtr->proc = proc;
    cmdPtr->clientData = clientData;
    cmdPtr->deleteProc = deleteProc;
    cmdPtr->deleteData = clientData;
    cmdPtr->flags = 0;
    cmdPtr->importRefPtr = NULL;
    cmdPtr->tracePtr = NULL;
    cmdPtr->nreProc = NULL;

    /*
     * Plug in any existing import references found above. Be sure to update
     * all of these references to point to the new command.
     */

    if (oldRefPtr != NULL) {
	cmdPtr->importRefPtr = oldRefPtr;
	while (oldRefPtr != NULL) {
	    refCmdPtr = oldRefPtr->importedCmdPtr;
	    dataPtr = refCmdPtr->objClientData;
	    dataPtr->realCmdPtr = cmdPtr;
	    oldRefPtr = oldRefPtr->nextPtr;
	}
    }

    /*
     * We just created a command, so in its namespace and all of its parent
     * namespaces, it may shadow global commands with the same name. If any
     * shadowed commands are found, invalidate all cached command references
     * in the affected namespaces.
     */

    TclResetShadowedCmdRefs(interp, cmdPtr);
    return (Tcl_Command) cmdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateObjCommand --
 *
 *	Define a new object-based command in a command table.
 *
 * Results:
 *	The return value is a token for the command, which can be used in
 *	future calls to Tcl_GetCommandName.
 *
 * Side effects:
 *	If no command named "cmdName" already exists for interp, one is
 *	created. Otherwise, if a command does exist, then if the object-based
 *	Tcl_ObjCmdProc is TclInvokeStringCommand, we assume Tcl_CreateCommand
 *	was called previously for the same command and just set its
 *	Tcl_ObjCmdProc to the argument "proc"; otherwise, we delete the old
 *	command.
 *
 *	In the future, during bytecode evaluation when "cmdName" is seen as
 *	the name of a command by Tcl_EvalObj or Tcl_Eval, the object-based
 *	Tcl_ObjCmdProc proc will be called. When the command is deleted from
 *	the table, deleteProc will be called. See the manual entry for details
 *	on the calling sequence.
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
Tcl_CreateObjCommand(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * previous call to Tcl_CreateInterp). */
    const char *cmdName,	/* Name of command. If it contains namespace
				 * qualifiers, the new command is put in the
				 * specified namespace; otherwise it is put in
				 * the global namespace. */
    Tcl_ObjCmdProc *proc,	/* Object-based function to associate with
				 * name. */
    ClientData clientData,	/* Arbitrary value to pass to object
				 * function. */
    Tcl_CmdDeleteProc *deleteProc)
				/* If not NULL, gives a function to call when
				 * this command is deleted. */
{
    Interp *iPtr = (Interp *) interp;
    ImportRef *oldRefPtr = NULL;
    Namespace *nsPtr, *dummy1, *dummy2;
    Command *cmdPtr, *refCmdPtr;
    Tcl_HashEntry *hPtr;
    const char *tail;
    int isNew;
    ImportedCmdData *dataPtr;

    if (iPtr->flags & DELETED) {
	/*
	 * The interpreter is being deleted. Don't create any new commands;
	 * it's not safe to muck with the interpreter anymore.
	 */

	return (Tcl_Command) NULL;
    }

    /*
     * Determine where the command should reside. If its name contains
     * namespace qualifiers, we put it in the specified namespace; otherwise,
     * we always put it in the global namespace.
     */

    if (strstr(cmdName, "::") != NULL) {
	TclGetNamespaceForQualName(interp, cmdName, NULL,
		TCL_CREATE_NS_IF_UNKNOWN, &nsPtr, &dummy1, &dummy2, &tail);
	if ((nsPtr == NULL) || (tail == NULL)) {
	    return (Tcl_Command) NULL;
	}
    } else {
	nsPtr = iPtr->globalNsPtr;
	tail = cmdName;
    }

    hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &isNew);
    TclInvalidateNsPath(nsPtr);
    if (!isNew) {
	cmdPtr = Tcl_GetHashValue(hPtr);

	/*
	 * Command already exists. If its object-based Tcl_ObjCmdProc is
	 * TclInvokeStringCommand, we just set its Tcl_ObjCmdProc to the
	 * argument "proc". Otherwise, we delete the old command.
	 */

	if (cmdPtr->objProc == TclInvokeStringCommand) {
	    cmdPtr->objProc = proc;
	    cmdPtr->objClientData = clientData;
	    cmdPtr->deleteProc = deleteProc;
	    cmdPtr->deleteData = clientData;
	    return (Tcl_Command) cmdPtr;
	}

	/*
	 * Otherwise, we delete the old command. Be careful to preserve any
	 * existing import links so we can restore them down below. That way,
	 * you can redefine a command and its import status will remain
	 * intact.
	 */

	oldRefPtr = cmdPtr->importRefPtr;
	cmdPtr->importRefPtr = NULL;

	Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
	hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &isNew);
	if (!isNew) {
	    /*
	     * If the deletion callback recreated the command, just throw away
	     * the new command (if we try to delete it again, we could get
	     * stuck in an infinite loop).
	     */

	     ckfree(Tcl_GetHashValue(hPtr));
	}
    } else {
	/*
	 * The list of command exported from the namespace might have changed.
	 * However, we do not need to recompute this just yet; next time we
	 * need the info will be soon enough.
	 */

	TclInvalidateNsCmdLookup(nsPtr);
    }
    cmdPtr = (Command *) ckalloc(sizeof(Command));
    Tcl_SetHashValue(hPtr, cmdPtr);
    cmdPtr->hPtr = hPtr;
    cmdPtr->nsPtr = nsPtr;
    cmdPtr->refCount = 1;
    cmdPtr->cmdEpoch = 0;
    cmdPtr->compileProc = NULL;
    cmdPtr->objProc = proc;
    cmdPtr->objClientData = clientData;
    cmdPtr->proc = TclInvokeObjectCommand;
    cmdPtr->clientData = cmdPtr;
    cmdPtr->deleteProc = deleteProc;
    cmdPtr->deleteData = clientData;
    cmdPtr->flags = 0;
    cmdPtr->importRefPtr = NULL;
    cmdPtr->tracePtr = NULL;
    cmdPtr->nreProc = NULL;

    /*
     * Plug in any existing import references found above. Be sure to update
     * all of these references to point to the new command.
     */

    if (oldRefPtr != NULL) {
	cmdPtr->importRefPtr = oldRefPtr;
	while (oldRefPtr != NULL) {
	    refCmdPtr = oldRefPtr->importedCmdPtr;
	    dataPtr = refCmdPtr->objClientData;
	    dataPtr->realCmdPtr = cmdPtr;
	    oldRefPtr = oldRefPtr->nextPtr;
	}
    }

    /*
     * We just created a command, so in its namespace and all of its parent
     * namespaces, it may shadow global commands with the same name. If any
     * shadowed commands are found, invalidate all cached command references
     * in the affected namespaces.
     */

    TclResetShadowedCmdRefs(interp, cmdPtr);
    return (Tcl_Command) cmdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInvokeStringCommand --
 *
 *	"Wrapper" Tcl_ObjCmdProc used to call an existing string-based
 *	Tcl_CmdProc if no object-based function exists for a command. A
 *	pointer to this function is stored as the Tcl_ObjCmdProc in a Command
 *	structure. It simply turns around and calls the string Tcl_CmdProc in
 *	the Command structure.
 *
 * Results:
 *	A standard Tcl object result value.
 *
 * Side effects:
 *	Besides those side effects of the called Tcl_CmdProc,
 *	TclInvokeStringCommand allocates and frees storage.
 *
 *----------------------------------------------------------------------
 */

int
TclInvokeStringCommand(
    ClientData clientData,	/* Points to command's Command structure. */
    Tcl_Interp *interp,		/* Current interpreter. */
    register int objc,		/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Command *cmdPtr = clientData;
    int i, result;
    const char **argv =
	    TclStackAlloc(interp, (unsigned)(objc + 1) * sizeof(char *));

    for (i = 0; i < objc; i++) {
	argv[i] = Tcl_GetString(objv[i]);
    }
    argv[objc] = 0;

    /*
     * Invoke the command's string-based Tcl_CmdProc.
     */

    result = cmdPtr->proc(cmdPtr->clientData, interp, objc, argv);

    TclStackFree(interp, (char **)argv);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInvokeObjectCommand --
 *
 *	"Wrapper" Tcl_CmdProc used to call an existing object-based
 *	Tcl_ObjCmdProc if no string-based function exists for a command. A
 *	pointer to this function is stored as the Tcl_CmdProc in a Command
 *	structure. It simply turns around and calls the object Tcl_ObjCmdProc
 *	in the Command structure.
 *
 * Results:
 *	A standard Tcl string result value.
 *
 * Side effects:
 *	Besides those side effects of the called Tcl_CmdProc,
 *	TclInvokeStringCommand allocates and frees storage.
 *
 *----------------------------------------------------------------------
 */

int
TclInvokeObjectCommand(
    ClientData clientData,	/* Points to command's Command structure. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int argc,			/* Number of arguments. */
    register const char **argv)	/* Argument strings. */
{
    Command *cmdPtr = clientData;
    Tcl_Obj *objPtr;
    int i, length, result;
    Tcl_Obj **objv =
	    TclStackAlloc(interp, (unsigned)(argc * sizeof(Tcl_Obj *)));

    for (i = 0; i < argc; i++) {
	length = strlen(argv[i]);
	TclNewStringObj(objPtr, argv[i], length);
	Tcl_IncrRefCount(objPtr);
	objv[i] = objPtr;
    }

    /*
     * Invoke the command's object-based Tcl_ObjCmdProc.
     */

    result = cmdPtr->objProc(cmdPtr->objClientData, interp, argc, objv);

    /*
     * Move the interpreter's object result to the string result, then reset
     * the object result.
     */

    (void) Tcl_GetStringResult(interp);

    /*
     * Decrement the ref counts for the argument objects created above, then
     * free the objv array if malloc'ed storage was used.
     */

    for (i = 0; i < argc; i++) {
	objPtr = objv[i];
	Tcl_DecrRefCount(objPtr);
    }
    TclStackFree(interp, objv);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclRenameCommand --
 *
 *	Called to give an existing Tcl command a different name. Both the old
 *	command name and the new command name can have "::" namespace
 *	qualifiers. If the new command has a different namespace context, the
 *	command will be moved to that namespace and will execute in the
 *	context of that new namespace.
 *
 *	If the new command name is NULL or the null string, the command is
 *	deleted.
 *
 * Results:
 *	Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
 *
 * Side effects:
 *	If anything goes wrong, an error message is returned in the
 *	interpreter's result object.
 *
 *----------------------------------------------------------------------
 */

int
TclRenameCommand(
    Tcl_Interp *interp,		/* Current interpreter. */
    const char *oldName,	/* Existing command name. */
    const char *newName)	/* New command name. */
{
    Interp *iPtr = (Interp *) interp;
    const char *newTail;
    Namespace *cmdNsPtr, *newNsPtr, *dummy1, *dummy2;
    Tcl_Command cmd;
    Command *cmdPtr;
    Tcl_HashEntry *hPtr, *oldHPtr;
    int isNew, result;
    Tcl_Obj *oldFullName;
    Tcl_DString newFullName;

    /*
     * Find the existing command. An error is returned if cmdName can't be
     * found.
     */

    cmd = Tcl_FindCommand(interp, oldName, NULL, /*flags*/ 0);
    cmdPtr = (Command *) cmd;
    if (cmdPtr == NULL) {
	Tcl_AppendResult(interp, "can't ",
		((newName == NULL)||(*newName == '\0'))? "delete":"rename",
		" \"", oldName, "\": command doesn't exist", NULL);
	return TCL_ERROR;
    }
    cmdNsPtr = cmdPtr->nsPtr;
    oldFullName = Tcl_NewObj();
    Tcl_IncrRefCount(oldFullName);
    Tcl_GetCommandFullName(interp, cmd, oldFullName);

    /*
     * If the new command name is NULL or empty, delete the command. Do this
     * with Tcl_DeleteCommandFromToken, since we already have the command.
     */

    if ((newName == NULL) || (*newName == '\0')) {
	Tcl_DeleteCommandFromToken(interp, cmd);
	result = TCL_OK;
	goto done;
    }

    /*
     * Make sure that the destination command does not already exist. The
     * rename operation is like creating a command, so we should automatically
     * create the containing namespaces just like Tcl_CreateCommand would.
     */

    TclGetNamespaceForQualName(interp, newName, NULL,
	    TCL_CREATE_NS_IF_UNKNOWN, &newNsPtr, &dummy1, &dummy2, &newTail);

    if ((newNsPtr == NULL) || (newTail == NULL)) {
	Tcl_AppendResult(interp, "can't rename to \"", newName,
		"\": bad command name", NULL);
	result = TCL_ERROR;
	goto done;
    }
    if (Tcl_FindHashEntry(&newNsPtr->cmdTable, newTail) != NULL) {
	Tcl_AppendResult(interp, "can't rename to \"", newName,
		 "\": command already exists", NULL);
	result = TCL_ERROR;
	goto done;
    }

    /*
     * Warning: any changes done in the code here are likely to be needed in
     * Tcl_HideCommand() code too (until the common parts are extracted out).
     * - dl
     */

    /*
     * Put the command in the new namespace so we can check for an alias loop.
     * Since we are adding a new command to a namespace, we must handle any
     * shadowing of the global commands that this might create.
     */

    oldHPtr = cmdPtr->hPtr;
    hPtr = Tcl_CreateHashEntry(&newNsPtr->cmdTable, newTail, &isNew);
    Tcl_SetHashValue(hPtr, cmdPtr);
    cmdPtr->hPtr = hPtr;
    cmdPtr->nsPtr = newNsPtr;
    TclResetShadowedCmdRefs(interp, cmdPtr);

    /*
     * Now check for an alias loop. If we detect one, put everything back the
     * way it was and report the error.
     */

    result = TclPreventAliasLoop(interp, interp, (Tcl_Command) cmdPtr);
    if (result != TCL_OK) {
	Tcl_DeleteHashEntry(cmdPtr->hPtr);
	cmdPtr->hPtr = oldHPtr;
	cmdPtr->nsPtr = cmdNsPtr;
	goto done;
    }

    /*
     * The list of command exported from the namespace might have changed.
     * However, we do not need to recompute this just yet; next time we need
     * the info will be soon enough. These might refer to the same variable,
     * but that's no big deal.
     */

    TclInvalidateNsCmdLookup(cmdNsPtr);
    TclInvalidateNsCmdLookup(cmdPtr->nsPtr);

    /*
     * Script for rename traces can delete the command "oldName". Therefore
     * increment the reference count for cmdPtr so that it's Command structure
     * is freed only towards the end of this function by calling
     * TclCleanupCommand.
     *
     * The trace function needs to get a fully qualified name for old and new
     * commands [Tcl bug #651271], or else there's no way for the trace
     * function to get the namespace from which the old command is being
     * renamed!
     */

    Tcl_DStringInit(&newFullName);
    Tcl_DStringAppend(&newFullName, newNsPtr->fullName, -1);
    if (newNsPtr != iPtr->globalNsPtr) {
	Tcl_DStringAppend(&newFullName, "::", 2);
    }
    Tcl_DStringAppend(&newFullName, newTail, -1);
    cmdPtr->refCount++;
    CallCommandTraces(iPtr, cmdPtr, Tcl_GetString(oldFullName),
	    Tcl_DStringValue(&newFullName), TCL_TRACE_RENAME);
    Tcl_DStringFree(&newFullName);

    /*
     * The new command name is okay, so remove the command from its current
     * namespace. This is like deleting the command, so bump the cmdEpoch to
     * invalidate any cached references to the command.
     */

    Tcl_DeleteHashEntry(oldHPtr);
    cmdPtr->cmdEpoch++;

    /*
     * If the command being renamed has a compile function, increment the
     * interpreter's compileEpoch to invalidate its compiled code. This makes
     * sure that we don't later try to execute old code compiled for the
     * now-renamed command.
     */

    if (cmdPtr->compileProc != NULL) {
	iPtr->compileEpoch++;
    }

    /*
     * Now free the Command structure, if the "oldName" command has been
     * deleted by invocation of rename traces.
     */

    TclCleanupCommandMacro(cmdPtr);
    result = TCL_OK;

  done:
    TclDecrRefCount(oldFullName);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetCommandInfo --
 *
 *	Modifies various information about a Tcl command. Note that this
 *	function will not change a command's namespace; use TclRenameCommand
 *	to do that. Also, the isNativeObjectProc member of *infoPtr is
 *	ignored.
 *
 * Results:
 *	If cmdName exists in interp, then the information at *infoPtr is
 *	stored with the command in place of the current information and 1 is
 *	returned. If the command doesn't exist then 0 is returned.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_SetCommandInfo(
    Tcl_Interp *interp,		/* Interpreter in which to look for
				 * command. */
    const char *cmdName,	/* Name of desired command. */
    const Tcl_CmdInfo *infoPtr)	/* Where to find information to store in the
				 * command. */
{
    Tcl_Command cmd;

    cmd = Tcl_FindCommand(interp, cmdName, NULL, /*flags*/ 0);
    return Tcl_SetCommandInfoFromToken(cmd, infoPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetCommandInfoFromToken --
 *
 *	Modifies various information about a Tcl command. Note that this
 *	function will not change a command's namespace; use TclRenameCommand
 *	to do that. Also, the isNativeObjectProc member of *infoPtr is
 *	ignored.
 *
 * Results:
 *	If cmdName exists in interp, then the information at *infoPtr is
 *	stored with the command in place of the current information and 1 is
 *	returned. If the command doesn't exist then 0 is returned.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_SetCommandInfoFromToken(
    Tcl_Command cmd,
    const Tcl_CmdInfo *infoPtr)
{
    Command *cmdPtr;		/* Internal representation of the command */

    if (cmd == (Tcl_Command) NULL) {
	return 0;
    }

    /*
     * The isNativeObjectProc and nsPtr members of *infoPtr are ignored.
     */

    cmdPtr = (Command *) cmd;
    cmdPtr->proc = infoPtr->proc;
    cmdPtr->clientData = infoPtr->clientData;
    if (infoPtr->objProc == NULL) {
	cmdPtr->objProc = TclInvokeStringCommand;
	cmdPtr->objClientData = cmdPtr;
	cmdPtr->nreProc = NULL;
    } else {
	if (infoPtr->objProc != cmdPtr->objProc) {
	    cmdPtr->nreProc = NULL;
	    cmdPtr->objProc = infoPtr->objProc;
	}
	cmdPtr->objClientData = infoPtr->objClientData;
    }
    cmdPtr->deleteProc = infoPtr->deleteProc;
    cmdPtr->deleteData = infoPtr->deleteData;
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandInfo --
 *
 *	Returns various information about a Tcl command.
 *
 * Results:
 *	If cmdName exists in interp, then *infoPtr is modified to hold
 *	information about cmdName and 1 is returned. If the command doesn't
 *	exist then 0 is returned and *infoPtr isn't modified.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetCommandInfo(
    Tcl_Interp *interp,		/* Interpreter in which to look for
				 * command. */
    const char *cmdName,	/* Name of desired command. */
    Tcl_CmdInfo *infoPtr)	/* Where to store information about
				 * command. */
{
    Tcl_Command cmd;

    cmd = Tcl_FindCommand(interp, cmdName, NULL, /*flags*/ 0);
    return Tcl_GetCommandInfoFromToken(cmd, infoPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandInfoFromToken --
 *
 *	Returns various information about a Tcl command.
 *
 * Results:
 *	Copies information from the command identified by 'cmd' into a
 *	caller-supplied structure and returns 1. If the 'cmd' is NULL, leaves
 *	the structure untouched and returns 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetCommandInfoFromToken(
    Tcl_Command cmd,
    Tcl_CmdInfo *infoPtr)
{
    Command *cmdPtr;		/* Internal representation of the command */

    if (cmd == (Tcl_Command) NULL) {
	return 0;
    }

    /*
     * Set isNativeObjectProc 1 if objProc was registered by a call to
     * Tcl_CreateObjCommand. Otherwise set it to 0.
     */

    cmdPtr = (Command *) cmd;
    infoPtr->isNativeObjectProc =
	    (cmdPtr->objProc != TclInvokeStringCommand);
    infoPtr->objProc = cmdPtr->objProc;
    infoPtr->objClientData = cmdPtr->objClientData;
    infoPtr->proc = cmdPtr->proc;
    infoPtr->clientData = cmdPtr->clientData;
    infoPtr->deleteProc = cmdPtr->deleteProc;
    infoPtr->deleteData = cmdPtr->deleteData;
    infoPtr->namespacePtr = (Tcl_Namespace *) cmdPtr->nsPtr;

    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandName --
 *
 *	Given a token returned by Tcl_CreateCommand, this function returns the
 *	current name of the command (which may have changed due to renaming).
 *
 * Results:
 *	The return value is the name of the given command.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

const char *
Tcl_GetCommandName(
    Tcl_Interp *interp,		/* Interpreter containing the command. */
    Tcl_Command command)	/* Token for command returned by a previous
				 * call to Tcl_CreateCommand. The command must
				 * not have been deleted. */
{
    Command *cmdPtr = (Command *) command;

    if ((cmdPtr == NULL) || (cmdPtr->hPtr == NULL)) {
	/*
	 * This should only happen if command was "created" after the
	 * interpreter began to be deleted, so there isn't really any command.
	 * Just return an empty string.
	 */

	return "";
    }

    return Tcl_GetHashKey(cmdPtr->hPtr->tablePtr, cmdPtr->hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCommandFullName --
 *
 *	Given a token returned by, e.g., Tcl_CreateCommand or Tcl_FindCommand,
 *	this function appends to an object the command's full name, qualified
 *	by a sequence of parent namespace names. The command's fully-qualified
 *	name may have changed due to renaming.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The command's fully-qualified name is appended to the string
 *	representation of objPtr.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_GetCommandFullName(
    Tcl_Interp *interp,		/* Interpreter containing the command. */
    Tcl_Command command,	/* Token for command returned by a previous
				 * call to Tcl_CreateCommand. The command must
				 * not have been deleted. */
    Tcl_Obj *objPtr)		/* Points to the object onto which the
				 * command's full name is appended. */

{
    Interp *iPtr = (Interp *) interp;
    register Command *cmdPtr = (Command *) command;
    char *name;

    /*
     * Add the full name of the containing namespace, followed by the "::"
     * separator, and the command name.
     */

    if (cmdPtr != NULL) {
	if (cmdPtr->nsPtr != NULL) {
	    Tcl_AppendToObj(objPtr, cmdPtr->nsPtr->fullName, -1);
	    if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
		Tcl_AppendToObj(objPtr, "::", 2);
	    }
	}
	if (cmdPtr->hPtr != NULL) {
	    name = Tcl_GetHashKey(cmdPtr->hPtr->tablePtr, cmdPtr->hPtr);
	    Tcl_AppendToObj(objPtr, name, -1);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteCommand --
 *
 *	Remove the given command from the given interpreter.
 *
 * Results:
 *	0 is returned if the command was deleted successfully. -1 is returned
 *	if there didn't exist a command by that name.
 *
 * Side effects:
 *	cmdName will no longer be recognized as a valid command for interp.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_DeleteCommand(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous Tcl_CreateInterp call). */
    const char *cmdName)	/* Name of command to remove. */
{
    Tcl_Command cmd;

    /*
     * Find the desired command and delete it.
     */

    cmd = Tcl_FindCommand(interp, cmdName, NULL, /*flags*/ 0);
    if (cmd == (Tcl_Command) NULL) {
	return -1;
    }
    return Tcl_DeleteCommandFromToken(interp, cmd);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteCommandFromToken --
 *
 *	Removes the given command from the given interpreter. This function
 *	resembles Tcl_DeleteCommand, but takes a Tcl_Command token instead of
 *	a command name for efficiency.
 *
 * Results:
 *	0 is returned if the command was deleted successfully. -1 is returned
 *	if there didn't exist a command by that name.
 *
 * Side effects:
 *	The command specified by "cmd" will no longer be recognized as a valid
 *	command for "interp".
 *
 *----------------------------------------------------------------------
 */

int
Tcl_DeleteCommandFromToken(
    Tcl_Interp *interp,		/* Token for command interpreter returned by a
				 * previous call to Tcl_CreateInterp. */
    Tcl_Command cmd)		/* Token for command to delete. */
{
    Interp *iPtr = (Interp *) interp;
    Command *cmdPtr = (Command *) cmd;
    ImportRef *refPtr, *nextRefPtr;
    Tcl_Command importCmd;

    /*
     * Bump the command epoch counter. This will invalidate all cached
     * references that point to this command.
     */

    cmdPtr->cmdEpoch++;

    /*
     * The code here is tricky. We can't delete the hash table entry before
     * invoking the deletion callback because there are cases where the
     * deletion callback needs to invoke the command (e.g. object systems such
     * as OTcl). However, this means that the callback could try to delete or
     * rename the command. The deleted flag allows us to detect these cases
     * and skip nested deletes.
     */

    if (cmdPtr->flags & CMD_IS_DELETED) {
	/*
	 * Another deletion is already in progress. Remove the hash table
	 * entry now, but don't invoke a callback or free the command
	 * structure. Take care to only remove the hash entry if it has not
	 * already been removed; otherwise if we manage to hit this function
	 * three times, everything goes up in smoke. [Bug 1220058]
	 */

	if (cmdPtr->hPtr != NULL) {
	    Tcl_DeleteHashEntry(cmdPtr->hPtr);
	    cmdPtr->hPtr = NULL;
	}
	return 0;
    }

    /*
     * We must delete this command, even though both traces and delete procs
     * may try to avoid this (renaming the command etc). Also traces and
     * delete procs may try to delete the command themsevles. This flag
     * declares that a delete is in progress and that recursive deletes should
     * be ignored.
     */

    cmdPtr->flags |= CMD_IS_DELETED;

    /*
     * Call trace functions for the command being deleted. Then delete its
     * traces.
     */

    if (cmdPtr->tracePtr != NULL) {
	CommandTrace *tracePtr;
	CallCommandTraces(iPtr,cmdPtr,NULL,NULL,TCL_TRACE_DELETE);

	/*
	 * Now delete these traces.
	 */

	tracePtr = cmdPtr->tracePtr;
	while (tracePtr != NULL) {
	    CommandTrace *nextPtr = tracePtr->nextPtr;
	    if ((--tracePtr->refCount) <= 0) {
		ckfree((char *) tracePtr);
	    }
	    tracePtr = nextPtr;
	}
	cmdPtr->tracePtr = NULL;
    }

    /*
     * The list of command exported from the namespace might have changed.
     * However, we do not need to recompute this just yet; next time we need
     * the info will be soon enough.
     */

    TclInvalidateNsCmdLookup(cmdPtr->nsPtr);

    /*
     * If the command being deleted has a compile function, increment the
     * interpreter's compileEpoch to invalidate its compiled code. This makes
     * sure that we don't later try to execute old code compiled with
     * command-specific (i.e., inline) bytecodes for the now-deleted command.
     * This field is checked in Tcl_EvalObj and ObjInterpProc, and code whose
     * compilation epoch doesn't match is recompiled.
     */

    if (cmdPtr->compileProc != NULL) {
	iPtr->compileEpoch++;
    }

    if (cmdPtr->deleteProc != NULL) {
	/*
	 * Delete the command's client data. If this was an imported command
	 * created when a command was imported into a namespace, this client
	 * data will be a pointer to a ImportedCmdData structure describing
	 * the "real" command that this imported command refers to.
	 *
	 * If you are getting a crash during the call to deleteProc and
	 * cmdPtr->deleteProc is a pointer to the function free(), the most
	 * likely cause is that your extension allocated memory for the
	 * clientData argument to Tcl_CreateObjCommand() with the ckalloc()
	 * macro and you are now trying to deallocate this memory with free()
	 * instead of ckfree(). You should pass a pointer to your own method
	 * that calls ckfree().
	 */

	cmdPtr->deleteProc(cmdPtr->deleteData);
    }

    /*
     * If this command was imported into other namespaces, then imported
     * commands were created that refer back to this command. Delete these
     * imported commands now.
     */

    for (refPtr = cmdPtr->importRefPtr; refPtr != NULL;
	    refPtr = nextRefPtr) {
	nextRefPtr = refPtr->nextPtr;
	importCmd = (Tcl_Command) refPtr->importedCmdPtr;
	Tcl_DeleteCommandFromToken(interp, importCmd);
    }

    /*
     * Don't use hPtr to delete the hash entry here, because it's possible
     * that the deletion callback renamed the command. Instead, use
     * cmdPtr->hptr, and make sure that no-one else has already deleted the
     * hash entry.
     */

    if (cmdPtr->hPtr != NULL) {
	Tcl_DeleteHashEntry(cmdPtr->hPtr);
	cmdPtr->hPtr = NULL;
    }

    /*
     * Mark the Command structure as no longer valid. This allows
     * TclExecuteByteCode to recognize when a Command has logically been
     * deleted and a pointer to this Command structure cached in a CmdName
     * object is invalid. TclExecuteByteCode will look up the command again in
     * the interpreter's command hashtable.
     */

    cmdPtr->objProc = NULL;

    /*
     * Now free the Command structure, unless there is another reference to it
     * from a CmdName Tcl object in some ByteCode code sequence. In that case,
     * delay the cleanup until all references are either discarded (when a
     * ByteCode is freed) or replaced by a new reference (when a cached
     * CmdName Command reference is found to be invalid and TclExecuteByteCode
     * looks up the command in the command hashtable).
     */

    TclCleanupCommandMacro(cmdPtr);
    return 0;
}

static char *
CallCommandTraces(
    Interp *iPtr,		/* Interpreter containing command. */
    Command *cmdPtr,		/* Command whose traces are to be invoked. */
    const char *oldName,	/* Command's old name, or NULL if we must get
				 * the name from cmdPtr */
    const char *newName,	/* Command's new name, or NULL if the command
				 * is not being renamed */
    int flags)			/* Flags indicating the type of traces to
				 * trigger, either TCL_TRACE_DELETE or
				 * TCL_TRACE_RENAME. */
{
    register CommandTrace *tracePtr;
    ActiveCommandTrace active;
    char *result;
    Tcl_Obj *oldNamePtr = NULL;
    Tcl_InterpState state = NULL;

    if (cmdPtr->flags & CMD_TRACE_ACTIVE) {
	/*
	 * While a rename trace is active, we will not process any more rename
	 * traces; while a delete trace is active we will never reach here -
	 * because Tcl_DeleteCommandFromToken checks for the condition
	 * (cmdPtr->flags & CMD_IS_DELETED) and returns immediately when a
	 * command deletion is in progress. For all other traces, delete
	 * traces will not be invoked but a call to TraceCommandProc will
	 * ensure that tracePtr->clientData is freed whenever the command
	 * "oldName" is deleted.
	 */

	if (cmdPtr->flags & TCL_TRACE_RENAME) {
	    flags &= ~TCL_TRACE_RENAME;
	}
	if (flags == 0) {
	    return NULL;
	}
    }
    cmdPtr->flags |= CMD_TRACE_ACTIVE;
    cmdPtr->refCount++;

    result = NULL;
    active.nextPtr = iPtr->activeCmdTracePtr;
    active.reverseScan = 0;
    iPtr->activeCmdTracePtr = &active;

    if (flags & TCL_TRACE_DELETE) {
	flags |= TCL_TRACE_DESTROYED;
    }
    active.cmdPtr = cmdPtr;

    Tcl_Preserve(iPtr);

    for (tracePtr = cmdPtr->tracePtr; tracePtr != NULL;
	    tracePtr = active.nextTracePtr) {
	active.nextTracePtr = tracePtr->nextPtr;
	if (!(tracePtr->flags & flags)) {
	    continue;
	}
	cmdPtr->flags |= tracePtr->flags;
	if (oldName == NULL) {
	    TclNewObj(oldNamePtr);
	    Tcl_IncrRefCount(oldNamePtr);
	    Tcl_GetCommandFullName((Tcl_Interp *) iPtr,
		    (Tcl_Command) cmdPtr, oldNamePtr);
	    oldName = TclGetString(oldNamePtr);
	}
	tracePtr->refCount++;
	if (state == NULL) {
	    state = Tcl_SaveInterpState((Tcl_Interp *) iPtr, TCL_OK);
	}
	tracePtr->traceProc(tracePtr->clientData, (Tcl_Interp *) iPtr,
		oldName, newName, flags);
	cmdPtr->flags &= ~tracePtr->flags;
	if ((--tracePtr->refCount) <= 0) {
	    ckfree((char *) tracePtr);
	}
    }

    if (state) {
	Tcl_RestoreInterpState((Tcl_Interp *) iPtr, state);
    }

    /*
     * If a new object was created to hold the full oldName, free it now.
     */

    if (oldNamePtr != NULL) {
	TclDecrRefCount(oldNamePtr);
    }

    /*
     * Restore the variable's flags, remove the record of our active traces,
     * and then return.
     */

    cmdPtr->flags &= ~CMD_TRACE_ACTIVE;
    cmdPtr->refCount--;
    iPtr->activeCmdTracePtr = active.nextPtr;
    Tcl_Release(iPtr);
    return result;
}

static int
CancelEvalProc(
    ClientData clientData,	/* Interp to cancel the script in progress. */
    Tcl_Interp *interp,		/* Ignored */
    int code)			/* Current return code from command. */
{
    CancelInfo *cancelInfo = clientData;
    Interp *iPtr;

    if (cancelInfo != NULL) {
	Tcl_MutexLock(&cancelLock);
	iPtr = (Interp *) cancelInfo->interp;

	if (iPtr != NULL) {
	    /*
	     * Setting this flag will cause the script in progress to be
	     * canceled as soon as possible. The core honors this flag at all
	     * the necessary places to ensure script cancellation is
	     * responsive. Extensions can check for this flag by calling
	     * Tcl_Canceled and checking if TCL_ERROR is returned or they can
	     * choose to ignore the script cancellation flag and the
	     * associated functionality altogether.
	     */

	    iPtr->flags |= CANCELED;

	    /*
	     * Currently, we only care about the TCL_CANCEL_UNWIND flag from
	     * Tcl_CancelEval. We do not want to simply combine all the flags
	     * from original Tcl_CancelEval call with the interp flags here
	     * just in case the caller passed flags that might cause behaviour
	     * unrelated to script cancellation.
	     */

	    if (cancelInfo->flags & TCL_CANCEL_UNWIND) {
		iPtr->flags |= TCL_CANCEL_UNWIND;
	    }

	    /*
	     * Create the result object now so that Tcl_Canceled can avoid
	     * locking the cancelLock mutex.
	     */
	    if (cancelInfo->result != NULL) {
		Tcl_SetStringObj(iPtr->asyncCancelMsg, cancelInfo->result,
			cancelInfo->length);
	    } else {
		Tcl_SetObjLength(iPtr->asyncCancelMsg, 0);
	    }
	}
	Tcl_MutexUnlock(&cancelLock);
    }

    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * GetCommandSource --
 *
 *	This function returns a Tcl_Obj with the full source string for the
 *	command. This insures that traces get a correct NUL-terminated command
 *	string. The Tcl_Obj has refCount==1.
 *
 *	*** MAINTAINER WARNING ***
 *	The returned Tcl_Obj is all wrong for any purpose but getting the
 *	source string for an objc/objv command line in the stringRep (no
 *	stringRep if no source is available) and the corresponding substituted
 *	version in the List intrep.
 *	This means that the intRep and stringRep DO NOT COINCIDE! Using these
 *	Tcl_Objs normally is likely to break things.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj *
GetCommandSource(
    Interp *iPtr,
    int objc,
    Tcl_Obj *const objv[],
    int lookup)
{
    Tcl_Obj *objPtr, *obj2Ptr;
    CmdFrame *cfPtr = iPtr->cmdFramePtr;
    const char *command = NULL;
    int numChars;

    objPtr = Tcl_NewListObj(objc, objv);
    if (lookup && cfPtr && (cfPtr->numLevels == iPtr->numLevels-1)) {
	switch (cfPtr->type) {
	case TCL_LOCATION_EVAL:
	case TCL_LOCATION_SOURCE:
	    command = cfPtr->cmd.str.cmd;
	    numChars = cfPtr->cmd.str.len;
	    break;
	case TCL_LOCATION_BC:
	case TCL_LOCATION_PREBC:
	    command = TclGetSrcInfoForCmd(iPtr, &numChars);
	    break;
	case TCL_LOCATION_EVAL_LIST:
	    /* Got it already */
	    break;
	}
	if (command) {
	    obj2Ptr = Tcl_NewStringObj(command, numChars);
	    objPtr->bytes = obj2Ptr->bytes;
	    objPtr->length = numChars;
	    obj2Ptr->bytes = NULL;
	    Tcl_DecrRefCount(obj2Ptr);
	}
    }
    Tcl_IncrRefCount(objPtr);
    return objPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCleanupCommand --
 *
 *	This function frees up a Command structure unless it is still
 *	referenced from an interpreter's command hashtable or from a CmdName
 *	Tcl object representing the name of a command in a ByteCode
 *	instruction sequence.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory gets freed unless a reference to the Command structure still
 *	exists. In that case the cleanup is delayed until the command is
 *	deleted or when the last ByteCode referring to it is freed.
 *
 *----------------------------------------------------------------------
 */

void
TclCleanupCommand(
    register Command *cmdPtr)	/* Points to the Command structure to
				 * be freed. */
{
    cmdPtr->refCount--;
    if (cmdPtr->refCount <= 0) {
	ckfree((char *) cmdPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateMathFunc --
 *
 *	Creates a new math function for expressions in a given interpreter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The Tcl function defined by "name" is created or redefined. If the
 *	function already exists then its definition is replaced; this includes
 *	the builtin functions. Redefining a builtin function forces all
 *	existing code to be invalidated since that code may be compiled using
 *	an instruction specific to the replaced function. In addition,
 *	redefioning a non-builtin function will force existing code to be
 *	invalidated if the number of arguments has changed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateMathFunc(
    Tcl_Interp *interp,		/* Interpreter in which function is to be
				 * available. */
    const char *name,		/* Name of function (e.g. "sin"). */
    int numArgs,		/* Nnumber of arguments required by
				 * function. */
    Tcl_ValueType *argTypes,	/* Array of types acceptable for each
				 * argument. */
    Tcl_MathProc *proc,		/* C function that implements the math
				 * function. */
    ClientData clientData)	/* Additional value to pass to the
				 * function. */
{
    Tcl_DString bigName;
    OldMathFuncData *data = (OldMathFuncData *)
	    ckalloc(sizeof(OldMathFuncData));

    data->proc = proc;
    data->numArgs = numArgs;
    data->argTypes = (Tcl_ValueType *)
	    ckalloc(numArgs * sizeof(Tcl_ValueType));
    memcpy(data->argTypes, argTypes, numArgs * sizeof(Tcl_ValueType));
    data->clientData = clientData;

    Tcl_DStringInit(&bigName);
    Tcl_DStringAppend(&bigName, "::tcl::mathfunc::", -1);
    Tcl_DStringAppend(&bigName, name, -1);

    Tcl_CreateObjCommand(interp, Tcl_DStringValue(&bigName),
	    OldMathFuncProc, data, OldMathFuncDeleteProc);
    Tcl_DStringFree(&bigName);
}

/*
 *----------------------------------------------------------------------
 *
 * OldMathFuncProc --
 *
 *	Dispatch to a math function created with Tcl_CreateMathFunc
 *
 * Results:
 *	Returns a standard Tcl result.
 *
 * Side effects:
 *	Whatever the math function does.
 *
 *----------------------------------------------------------------------
 */

static int
OldMathFuncProc(
    ClientData clientData,	/* Ponter to OldMathFuncData describing the
				 * function being called */
    Tcl_Interp *interp,		/* Tcl interpreter */
    int objc,			/* Actual parameter count */
    Tcl_Obj *const *objv)	/* Parameter vector */
{
    Tcl_Obj *valuePtr;
    OldMathFuncData *dataPtr = clientData;
    Tcl_Value funcResult, *args;
    int result;
    int j, k;
    double d;

    /*
     * Check argument count.
     */

    if (objc != dataPtr->numArgs + 1) {
	MathFuncWrongNumArgs(interp, dataPtr->numArgs+1, objc, objv);
	return TCL_ERROR;
    }

    /*
     * Convert arguments from Tcl_Obj's to Tcl_Value's.
     */

    args = (Tcl_Value *) ckalloc(dataPtr->numArgs * sizeof(Tcl_Value));
    for (j = 1, k = 0; j < objc; ++j, ++k) {
	/* TODO: Convert to TclGetNumberFromObj() ? */
	valuePtr = objv[j];
	result = Tcl_GetDoubleFromObj(NULL, valuePtr, &d);
#ifdef ACCEPT_NAN
	if ((result != TCL_OK) && (valuePtr->typePtr == &tclDoubleType)) {
	    d = valuePtr->internalRep.doubleValue;
	    result = TCL_OK;
	}
#endif
	if (result != TCL_OK) {
	    /*
	     * We have a non-numeric argument.
	     */

	    Tcl_SetResult(interp,
		    "argument to math function didn't have numeric value",
		    TCL_STATIC);
	    TclCheckBadOctal(interp, Tcl_GetString(valuePtr));
	    ckfree((char *) args);
	    return TCL_ERROR;
	}

	/*
	 * Copy the object's numeric value to the argument record, converting
	 * it if necessary.
	 *
	 * NOTE: no bignum support; use the new mathfunc interface for that.
	 */

	args[k].type = dataPtr->argTypes[k];
	switch (args[k].type) {
	case TCL_EITHER:
	    if (Tcl_GetLongFromObj(NULL, valuePtr, &(args[k].intValue))
		    == TCL_OK) {
		args[k].type = TCL_INT;
		break;
	    }
	    if (Tcl_GetWideIntFromObj(interp, valuePtr, &(args[k].wideValue))
		    == TCL_OK) {
		args[k].type = TCL_WIDE_INT;
		break;
	    }
	    args[k].type = TCL_DOUBLE;
	    /* FALLTHROUGH */

	case TCL_DOUBLE:
	    args[k].doubleValue = d;
	    break;
	case TCL_INT:
	    if (ExprIntFunc(NULL, interp, 2, &(objv[j-1])) != TCL_OK) {
		ckfree((char *) args);
		return TCL_ERROR;
	    }
	    valuePtr = Tcl_GetObjResult(interp);
	    Tcl_GetLongFromObj(NULL, valuePtr, &(args[k].intValue));
	    Tcl_ResetResult(interp);
	    break;
	case TCL_WIDE_INT:
	    if (ExprWideFunc(NULL, interp, 2, &(objv[j-1])) != TCL_OK) {
		ckfree((char *) args);
		return TCL_ERROR;
	    }
	    valuePtr = Tcl_GetObjResult(interp);
	    Tcl_GetWideIntFromObj(NULL, valuePtr, &(args[k].wideValue));
	    Tcl_ResetResult(interp);
	    break;
	}
    }

    /*
     * Call the function.
     */

    errno = 0;
    result = dataPtr->proc(dataPtr->clientData, interp, args, &funcResult);
    ckfree((char *) args);
    if (result != TCL_OK) {
	return result;
    }

    /*
     * Return the result of the call.
     */

    if (funcResult.type == TCL_INT) {
	TclNewLongObj(valuePtr, funcResult.intValue);
    } else if (funcResult.type == TCL_WIDE_INT) {
	valuePtr = Tcl_NewWideIntObj(funcResult.wideValue);
    } else {
	return CheckDoubleResult(interp, funcResult.doubleValue);
    }
    Tcl_SetObjResult(interp, valuePtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * OldMathFuncDeleteProc --
 *
 *	Cleans up after deleting a math function registered with
 *	Tcl_CreateMathFunc
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees allocated memory.
 *
 *----------------------------------------------------------------------
 */

static void
OldMathFuncDeleteProc(
     ClientData clientData)
{
    OldMathFuncData *dataPtr = clientData;

    ckfree((char *) dataPtr->argTypes);
    ckfree((char *) dataPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetMathFuncInfo --
 *
 *	Discovers how a particular math function was created in a given
 *	interpreter.
 *
 * Results:
 *	TCL_OK if it succeeds, TCL_ERROR else (leaving an error message in the
 *	interpreter result if that happens.)
 *
 * Side effects:
 *	If this function succeeds, the variables pointed to by the numArgsPtr
 *	and argTypePtr arguments will be updated to detail the arguments
 *	allowed by the function. The variable pointed to by the procPtr
 *	argument will be set to NULL if the function is a builtin function,
 *	and will be set to the address of the C function used to implement the
 *	math function otherwise (in which case the variable pointed to by the
 *	clientDataPtr argument will also be updated.)
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GetMathFuncInfo(
    Tcl_Interp *interp,
    const char *name,
    int *numArgsPtr,
    Tcl_ValueType **argTypesPtr,
    Tcl_MathProc **procPtr,
    ClientData *clientDataPtr)
{
    Tcl_Obj *cmdNameObj;
    Command *cmdPtr;

    /*
     * Get the command that implements the math function.
     */

    TclNewLiteralStringObj(cmdNameObj, "tcl::mathfunc::");
    Tcl_AppendToObj(cmdNameObj, name, -1);
    Tcl_IncrRefCount(cmdNameObj);
    cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, cmdNameObj);
    Tcl_DecrRefCount(cmdNameObj);

    /*
     * Report unknown functions.
     */

    if (cmdPtr == NULL) {
	Tcl_Obj *message;

	TclNewLiteralStringObj(message, "unknown math function \"");
	Tcl_AppendToObj(message, name, -1);
	Tcl_AppendToObj(message, "\"", 1);
	Tcl_SetObjResult(interp, message);
	*numArgsPtr = -1;
	*argTypesPtr = NULL;
	*procPtr = NULL;
	*clientDataPtr = NULL;
	return TCL_ERROR;
    }

    /*
     * Retrieve function info for user defined functions; return dummy
     * information for builtins.
     */

    if (cmdPtr->objProc == &OldMathFuncProc) {
	OldMathFuncData *dataPtr = cmdPtr->clientData;

	*procPtr = dataPtr->proc;
	*numArgsPtr = dataPtr->numArgs;
	*argTypesPtr = dataPtr->argTypes;
	*clientDataPtr = dataPtr->clientData;
    } else {
	*procPtr = NULL;
	*numArgsPtr = -1;
	*argTypesPtr = NULL;
	*procPtr = NULL;
	*clientDataPtr = NULL;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ListMathFuncs --
 *
 *	Produces a list of all the math functions defined in a given
 *	interpreter.
 *
 * Results:
 *	A pointer to a Tcl_Obj structure with a reference count of zero, or
 *	NULL in the case of an error (in which case a suitable error message
 *	will be left in the interpreter result.)
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj *
Tcl_ListMathFuncs(
    Tcl_Interp *interp,
    const char *pattern)
{
    Namespace *globalNsPtr = (Namespace *) Tcl_GetGlobalNamespace(interp);
    Namespace *nsPtr;
    Namespace *dummy1NsPtr;
    Namespace *dummy2NsPtr;
    const char *dummyNamePtr;
    Tcl_Obj *result = Tcl_NewObj();

    TclGetNamespaceForQualName(interp, "::tcl::mathfunc",
	    globalNsPtr, TCL_FIND_ONLY_NS | TCL_GLOBAL_ONLY,
	    &nsPtr, &dummy1NsPtr, &dummy2NsPtr, &dummyNamePtr);
    if (nsPtr == NULL) {
	return result;
    }

    if ((pattern != NULL) && TclMatchIsTrivial(pattern)) {
	if (Tcl_FindHashEntry(&nsPtr->cmdTable, pattern) != NULL) {
	    Tcl_ListObjAppendElement(NULL, result,
		    Tcl_NewStringObj(pattern, -1));
	}
    } else {
	Tcl_HashSearch cmdHashSearch;
	Tcl_HashEntry *cmdHashEntry =
		Tcl_FirstHashEntry(&nsPtr->cmdTable,&cmdHashSearch);

	for (; cmdHashEntry != NULL;
		cmdHashEntry = Tcl_NextHashEntry(&cmdHashSearch)) {
	    const char *cmdNamePtr =
		    Tcl_GetHashKey(&nsPtr->cmdTable, cmdHashEntry);

	    if (pattern == NULL || Tcl_StringMatch(cmdNamePtr, pattern)) {
		Tcl_ListObjAppendElement(NULL, result,
			Tcl_NewStringObj(cmdNamePtr, -1));
	    }
	}
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInterpReady --
 *
 *	Check if an interpreter is ready to eval commands or scripts, i.e., if
 *	it was not deleted and if the nesting level is not too high.
 *
 * Results:
 *	The return value is TCL_OK if it the interpreter is ready, TCL_ERROR
 *	otherwise.
 *
 * Side effects:
 *	The interpreters object and string results are cleared.
 *
 *----------------------------------------------------------------------
 */

int
TclInterpReady(
    Tcl_Interp *interp)
{
    register Interp *iPtr = (Interp *) interp;

    /*
     * Reset both the interpreter's string and object results and clear out
     * any previous error information.
     */

    Tcl_ResetResult(interp);

    /*
     * If the interpreter has been deleted, return an error.
     */

    if (iPtr->flags & DELETED) {
	/* JJM - Superfluous Tcl_ResetResult call removed. */
	Tcl_AppendResult(interp,
		"attempt to call eval in deleted interpreter", NULL);
	Tcl_SetErrorCode(interp, "TCL", "IDELETE",
		"attempt to call eval in deleted interpreter", NULL);
	return TCL_ERROR;
    }

    if (iPtr->execEnvPtr->rewind ||
	    (TCL_OK != Tcl_Canceled(interp, TCL_LEAVE_ERR_MSG))) {
	return TCL_ERROR;
    }

    /*
     * Check depth of nested calls to Tcl_Eval: if this gets too large, it's
     * probably because of an infinite loop somewhere.
     */

    if (((iPtr->numLevels) <= iPtr->maxNestingDepth)) {
	return TCL_OK;
    }

    Tcl_AppendResult(interp,
	    "too many nested evaluations (infinite loop?)", NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * TclResetCancellation --
 *
 *	Reset the script cancellation flags if the nesting level
 *	(iPtr->numLevels) for the interp is zero or argument force is
 *	non-zero.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	The script cancellation flags for the interp may be reset.
 *
 *----------------------------------------------------------------------
 */

int
TclResetCancellation(
    Tcl_Interp *interp,
    int force)
{
    register Interp *iPtr = (Interp *) interp;

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

    if (force || (iPtr->numLevels == 0)) {
	iPtr->flags &= (~(CANCELED | TCL_CANCEL_UNWIND));
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Canceled --
 *
 *	Check if the script in progress has been canceled, i.e.,
 *	Tcl_CancelEval was called for this interpreter or any of its master
 *	interpreters.
 *
 * Results:
 *	The return value is TCL_OK if the script evaluation has not been
 *	canceled, TCL_ERROR otherwise.
 *
 *	If "flags" contains TCL_LEAVE_ERR_MSG, an error message is returned in
 *	the interpreter's result object. Otherwise, the interpreter's result
 *	object is left unchanged. If "flags" contains TCL_CANCEL_UNWIND,
 *	TCL_ERROR will only be returned if the script evaluation is being
 *	completely unwound.
 *
 * Side effects:
 *	The CANCELED flag for the interp will be reset if it is set.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_Canceled(
    Tcl_Interp *interp,
    int flags)
{
    register Interp *iPtr = (Interp *) interp;

    /*
     * Traverse up the to the top-level interp, checking for the CANCELED flag
     * along the way. If any of the intervening interps have the CANCELED flag
     * set, the current script in progress is considered to be canceled and we
     * stop checking. Otherwise, if any interp has the DELETED flag set we
     * stop checking.
     */

    for (; iPtr!=NULL; iPtr = (Interp *) Tcl_GetMaster((Tcl_Interp *) iPtr)) {
	/*
	 * Has the current script in progress for this interpreter been
	 * canceled or is the stack being unwound due to the previous script
	 * cancellation?
	 */

	if ((iPtr->flags & CANCELED) || (iPtr->flags & TCL_CANCEL_UNWIND)) {
	    /*
	     * The CANCELED flag is a one-shot flag that is reset immediately
	     * upon being detected; however, if the TCL_CANCEL_UNWIND flag is
	     * set we will continue to report that the script in progress has
	     * been canceled thereby allowing the evaluation stack for the
	     * interp to be fully unwound.
	     */

	    iPtr->flags &= ~CANCELED;

	    /*
	     * The CANCELED flag was detected and reset; however, if the
	     * caller specified the TCL_CANCEL_UNWIND flag, we only return
	     * TCL_ERROR (indicating that the script in progress has been
	     * canceled) if the evaluation stack for the interp is being fully
	     * unwound.
	     */

	    if (!(flags & TCL_CANCEL_UNWIND)
		    || (iPtr->flags & TCL_CANCEL_UNWIND)) {
		/*
		 * If the TCL_LEAVE_ERR_MSG flags bit is set, place an error
		 * in the interp's result; otherwise, we leave it alone.
		 */

		if (flags & TCL_LEAVE_ERR_MSG) {
		    const char *id, *message = NULL;
		    int length;

		    /*
		     * Setup errorCode variables so that we can differentiate
		     * between being canceled and unwound.
		     */

		    if (iPtr->asyncCancelMsg != NULL) {
			message = Tcl_GetStringFromObj(iPtr->asyncCancelMsg,
				&length);
		    } else {
			length = 0;
		    }

		    if (iPtr->flags & TCL_CANCEL_UNWIND) {
			id = "IUNWIND";
			if (length == 0) {
			    message = "eval unwound";
			}
		    } else {
			id = "ICANCEL";
			if (length == 0) {
			    message = "eval canceled";
			}
		    }

		    Tcl_ResetResult(interp);
		    Tcl_AppendResult(interp, message, NULL);
		    Tcl_SetErrorCode(interp, "TCL", id, message, NULL);
		}

		/*
		 * Return TCL_ERROR to the caller (not necessarily just the
		 * Tcl core itself) that indicates further processing of the
		 * script or command in progress should halt gracefully and as
		 * soon as possible.
		 */

		return TCL_ERROR;
	    }
	} else {
	    /*
	     * FIXME: If this interpreter is being deleted we cannot continue
	     *	to traverse up the interp chain due to an issue with
	     *	Tcl_GetMaster (really the slave interp bookkeeping) that
	     *	causes us to run off into a freed interp struct. Ideally, this
	     *	check would not be necessary because Tcl_GetMaster would
	     *	return NULL instead of a pointer to invalid (freed) memory.
	     */

	    if (iPtr->flags & DELETED) {
		break;
	    }
	}
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CancelEval --
 *
 *	This function schedules the cancellation of the current script in the
 *	given interpreter.
 *
 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. Since the interp may belong to a different thread, no error
 *	message can be left in the interp's result.
 *
 * Side effects:
 *	The script in progress in the specified interpreter will be canceled
 *	with TCL_ERROR after asynchronous handlers are invoked at the next
 *	Tcl_Canceled check.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_CancelEval(
    Tcl_Interp *interp,		/* Interpreter in which to cancel the
				 * script. */
    Tcl_Obj *resultObjPtr,	/* The script cancellation error message or
				 * NULL for a default error message. */
    ClientData clientData,	/* Passed to CancelEvalProc. */
    int flags)			/* Collection of OR-ed bits that control
				 * the cancellation of the script. Only
				 * TCL_CANCEL_UNWIND is currently
				 * supported. */
{
    Tcl_HashEntry *hPtr;
    CancelInfo *cancelInfo;
    int code = TCL_ERROR;
    const char *result;

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

    Tcl_MutexLock(&cancelLock);
    if (cancelTableInitialized != 1) {
	/*
	 * No CancelInfo hash table (Tcl_CreateInterp has never been called?)
	 */

	goto done;
    }
    hPtr = Tcl_FindHashEntry(&cancelTable, (char *) interp);
    if (hPtr == NULL) {
	/*
	 * No CancelInfo record for this interpreter.
	 */

	goto done;
    }
    cancelInfo = Tcl_GetHashValue(hPtr);

    /*
     * Populate information needed by the interpreter thread to fulfill the
     * cancellation request. Currently, clientData is ignored. If the
     * TCL_CANCEL_UNWIND flags bit is set, the script in progress is not
     * allowed to catch the script cancellation because the evaluation stack
     * for the interp is completely unwound.
     */

    if (resultObjPtr != NULL) {
	result = Tcl_GetStringFromObj(resultObjPtr, &cancelInfo->length);
	cancelInfo->result = ckrealloc(cancelInfo->result,cancelInfo->length);
	memcpy(cancelInfo->result, result, (size_t) cancelInfo->length);
	TclDecrRefCount(resultObjPtr);	/* Discard their result object. */
    } else {
	cancelInfo->result = NULL;
	cancelInfo->length = 0;
    }
    cancelInfo->clientData = clientData;
    cancelInfo->flags = flags;
    Tcl_AsyncMark(cancelInfo->async);
    code = TCL_OK;

  done:
    Tcl_MutexUnlock(&cancelLock);
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InterpActive --
 *
 *	Returns non-zero if the specified interpreter is in use, i.e. if there
 *	is an evaluation currently active in the interpreter.
 *
 * Results:
 *	See above.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_InterpActive(
    Tcl_Interp *interp)
{
    return ((Interp *) interp)->numLevels > 0;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalObjv --
 *
 *	This function evaluates a Tcl command that has already been parsed
 *	into words, with one Tcl_Obj holding each word.
 *
 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. A result or error message is left in interp's result.
 *
 * Side effects:
 *	Always pushes a callback. Other side effects depend on the command.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_EvalObjv(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * command. Also used for error reporting. */
    int objc,			/* Number of words in command. */
    Tcl_Obj *const objv[],	/* An array of pointers to objects that are
				 * the words that make up the command. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL, TCL_EVAL_INVOKE and
				 * TCL_EVAL_NOERR are currently supported. */
{
    int result;
    TEOV_callback *rootPtr = TOP_CB(interp);

    result = TclNREvalObjv(interp, objc, objv, flags, NULL);
    return TclNRRunCallbacks(interp, result, rootPtr, 0);
}

int
TclNREvalObjv(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * command. Also used for error reporting. */
    int objc,			/* Number of words in command. */
    Tcl_Obj *const objv[],	/* An array of pointers to objects that are
				 * the words that make up the command. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL, TCL_EVAL_INVOKE and
				 * TCL_EVAL_NOERR are currently supported. */
    Command *cmdPtr)		/* NULL if the Command is to be looked up
				 * here, otherwise the pointer to the
				 * requested Command struct to be invoked. */
{
    Interp *iPtr = (Interp *) interp;
    int result;
    Namespace *lookupNsPtr = iPtr->lookupNsPtr;
    Tcl_ObjCmdProc *objProc;
    ClientData objClientData;
    Command **cmdPtrPtr;

    iPtr->lookupNsPtr = NULL;

    /*
     * Push a callback with cleanup tasks for commands; the cmdPtr at data[0]
     * will be filled later when the command is found: save its address at
     * objProcPtr.
     *
     * data[1] stores a marker for use by tailcalls; it will be reset to 0 by
     * command redirectors (imports, alias, ensembles) so that tailcalls
     * finishes the source command and not just the target.
     */

    TclNRAddCallback(interp, NRCommand, NULL, NULL, NULL, NULL);
    cmdPtrPtr = (Command **) &(TOP_CB(interp)->data[0]);

    iPtr->numLevels++;
    result = TclInterpReady(interp);

    if ((result != TCL_OK) || (objc == 0)) {
	return result;
    }

    if (cmdPtr) {
	goto commandFound;
    }

    /*
     * Push records for task to be done on return, in INVERSE order. First, if
     * needed, the exception handlers (as they should happen last).
     */

    if (!(flags & TCL_EVAL_NOERR)) {
	TEOV_PushExceptionHandlers(interp, objc, objv, flags);
    }

    /*
     * Configure evaluation context to match the requested flags.
     */

    if ((flags & TCL_EVAL_INVOKE) || lookupNsPtr) {
	if (!lookupNsPtr) {
	    lookupNsPtr = iPtr->globalNsPtr;
	}
    } else {
	if (flags & TCL_EVAL_GLOBAL) {
	    TEOV_SwitchVarFrame(interp);
	    lookupNsPtr = iPtr->globalNsPtr;
	}

	/*
	 * TCL_EVAL_INVOKE was not set: clear rewrite rules
	 */

	iPtr->ensembleRewrite.sourceObjs = NULL;
    }

    /*
     * Lookup the command
     */

    cmdPtr = TEOV_LookupCmdFromObj(interp, objv[0], lookupNsPtr);
    if (!cmdPtr) {
    notFound:
	result = TEOV_NotFound(interp, objc, objv, lookupNsPtr);
	return result;
    }

    iPtr->cmdCount++;
    if (TclLimitExceeded(iPtr->limit)) {
	return TCL_ERROR;
    }

    /*
     * Found a command! The real work begins now ...
     */

  commandFound:
    if (iPtr->tracePtr || (cmdPtr->flags & CMD_HAS_EXEC_TRACES)) {
	/*
	 * Call enter traces. They will schedule a call to the leave traces if
	 * necessary.
	 */

	result = TEOV_RunEnterTraces(interp, &cmdPtr, objc, objv, lookupNsPtr);
	if (!cmdPtr) {
	    goto notFound;
	}
	if (result != TCL_OK) {
	    return result;
	}
    }

    if (TCL_DTRACE_CMD_ARGS_ENABLED()) {
	char *a[10];
	int i = 0;

	while (i < 10) {
	    a[i] = i < objc ? TclGetString(objv[i]) : NULL; i++;
	}
	TCL_DTRACE_CMD_ARGS(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    if (TCL_DTRACE_CMD_INFO_ENABLED() && iPtr->cmdFramePtr) {
	Tcl_Obj *info = TclInfoFrame(interp, iPtr->cmdFramePtr);
	const char *a[6]; int i[2];

	TclDTraceInfo(info, a, i);
	TCL_DTRACE_CMD_INFO(a[0], a[1], a[2], a[3], i[0], i[1], a[4], a[5]);
	TclDecrRefCount(info);
    }
    if (TCL_DTRACE_CMD_RETURN_ENABLED() || TCL_DTRACE_CMD_RESULT_ENABLED()) {
	TclNRAddCallback(interp, DTraceCmdReturn, objv[0], NULL, NULL, NULL);
    }
    if (TCL_DTRACE_CMD_ENTRY_ENABLED()) {
	TCL_DTRACE_CMD_ENTRY(TclGetString(objv[0]), objc - 1,
		(Tcl_Obj **)(objv + 1));
    }

    /*
     * Fix the original callback to point to the now known cmdPtr. Insure that
     * the Command struct lives until the command returns.
     */

    *cmdPtrPtr = cmdPtr;
    cmdPtr->refCount++;

    /*
     * Find the objProc to call: nreProc if available, objProc otherwise. Push
     * a callback to do the actual running.
     */

    objProc = cmdPtr->nreProc;
    if (!objProc) {
	objProc = cmdPtr->objProc;
    }
    objClientData = cmdPtr->objClientData;

    TclNRAddCallback(interp, NRRunObjProc, objProc, objClientData,
	    INT2PTR(objc), (ClientData) objv);
    return TCL_OK;
}

int
TclNRRunCallbacks(
    Tcl_Interp *interp,
    int result,
    struct TEOV_callback *rootPtr,
				/* All callbacks down to rootPtr not inclusive
				 * are to be run. */
    int tebcCall)		/* Normal callers set this to 0; TEBC sets it
				 * to 1 when executing a bytecode, to 2 when
				 * cleaning up after a bytecode returns. */
{
    Interp *iPtr = (Interp *) interp;
    TEOV_callback *callbackPtr;
    Tcl_NRPostProc *procPtr;

    /*
     * If the interpreter has a non-empty string result, the result object is
     * either empty or stale because some function set interp->result
     * directly. If so, move the string result to the result object, then
     * reset the string result.
     *
     * This only needs to be done for the first item in the list: all other
     * are for NR function calls, and those are Tcl_Obj based.
     */

    if (*(iPtr->result) != 0) {
	(void) Tcl_GetObjResult(interp);
    }

  restart:
    while (TOP_CB(interp) != rootPtr) {
	callbackPtr = TOP_CB(interp);

	procPtr = callbackPtr->procPtr;

	if (tebcCall && (procPtr == NRCallTEBC)) {
	    NRE_ASSERT(result==TCL_OK);
	    return TCL_OK;
	}

	/*
	 * IMPLEMENTATION REMARKS (FIXME)
	 *
	 * Add here other direct handling possibilities for optimisation? One
	 * could handle the very frequent NRCommand and NRRunObjProc right
	 * here to save an indirect function call and improve icache
	 * management. Would it? Test it, time it ...
	 */

	TOP_CB(interp) = callbackPtr->nextPtr;
	result = procPtr(callbackPtr->data, interp, result);
	TCLNR_FREE(interp, callbackPtr);
    }
    if (iPtr->atExitPtr) {
	callbackPtr = iPtr->atExitPtr;
	while (callbackPtr->nextPtr) {
	    callbackPtr = callbackPtr->nextPtr;
	}
	callbackPtr->nextPtr = rootPtr;
	TOP_CB(iPtr) = iPtr->atExitPtr;
	iPtr->atExitPtr = NULL;
	goto restart;
    }
    return result;
}

int
NRCommand(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    Command *cmdPtr = data[0];
    /* int cmdStart = PTR2INT(data[1]); NOT USED HERE */

    if (cmdPtr) {
	TclCleanupCommandMacro(cmdPtr);
    }
    ((Interp *)interp)->numLevels--;

    /* OPT ??
     * Do not interrupt a series of cleanups with async or limit checks:
     * just check at the end?
     */

    if (TclAsyncReady(iPtr)) {
	result = Tcl_AsyncInvoke(interp, result);
    }
    if (result == TCL_OK) {
	result = Tcl_Canceled(interp, TCL_LEAVE_ERR_MSG);
    }
    if (result == TCL_OK && TclLimitReady(iPtr->limit)) {
	result = Tcl_LimitCheck(interp);
    }
    return result;
}

static int
NRRunObjProc(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    /* OPT: do not call? */

    Tcl_ObjCmdProc *objProc = data[0];
    ClientData objClientData = data[1];
    int objc = PTR2INT(data[2]);
    Tcl_Obj **objv = data[3];

    if (result == TCL_OK) {
	return objProc(objClientData, interp, objc, objv);
    }
    return result;
}

int
NRCallTEBC(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    /*
     * This is not run normally, the callback is passed up to tebc. This
     function is only called when no tebc is above.
     */
    int type = PTR2INT(data[0]);
    Interp *iPtr = ((Interp *) interp);

    NRE_ASSERT(result == TCL_OK);

    switch (type) {
    case TCL_NR_BC_TYPE:
	return TclExecuteByteCode(interp, data[1]);
    case TCL_NR_ATEXIT_TYPE:
    case TCL_NR_TAILCALL_TYPE:
	/* For atProcExit and tailcalls */
	Tcl_SetResult(interp,
		"atProcExit/tailcall can only be called from a proc or lambda",
		TCL_STATIC);
	return TCL_ERROR;
    case TCL_NR_YIELD_TYPE:
	if (iPtr->execEnvPtr->corPtr) {
	    Tcl_SetResult(interp, "cannot yield: C stack busy", TCL_STATIC);
	    Tcl_SetErrorCode(interp, "COROUTINE_CANT_YIELD", NULL);
	} else {
	    Tcl_SetResult(interp, "yield can only be called in a coroutine",
		    TCL_STATIC);
	    Tcl_SetErrorCode(interp, "COROUTINE_ILLEGAL_YIELD", NULL);
	}
	return TCL_ERROR;
    default:
	Tcl_Panic("unknown call type to TEBC");
    }
    return result; /* not reached */
}

/*
 *----------------------------------------------------------------------
 *
 * TEOV_Exception	 -
 * TEOV_LookupCmdFromObj -
 * TEOV_RunEnterTraces	 -
 * TEOV_RunLeaveTraces	 -
 * TEOV_NotFound	 -
 *
 *	These are helper functions for Tcl_EvalObjv.
 *
 *----------------------------------------------------------------------
 */

static void
TEOV_PushExceptionHandlers(
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[],
    int flags)
{
    Interp *iPtr = (Interp *) interp;

    /*
     * If any error processing is necessary, push the appropriate records.
     * Note that we have to push them in the inverse order: first the one that
     * has to run last.
     */

    if (!(flags & TCL_EVAL_INVOKE)) {
	/*
	 * Error messages
	 */

	TclNRAddCallback(interp, TEOV_Error, INT2PTR(objc),
		(ClientData) objv, NULL, NULL);
    }

    if (iPtr->numLevels == 1) {
	/*
	 * No CONTINUE or BREAK at level 0, manage RETURN
	 */

	TclNRAddCallback(interp, TEOV_Exception, INT2PTR(iPtr->evalFlags),
		NULL, NULL, NULL);
    }
}

static void
TEOV_SwitchVarFrame(
    Tcl_Interp *interp)
{
    Interp *iPtr = (Interp *) interp;

    /*
     * Change the varFrame to be the rootVarFrame, and push a record to
     * restore things at the end.
     */

    TclNRAddCallback(interp, TEOV_RestoreVarFrame, iPtr->varFramePtr, NULL,
	    NULL, NULL);
    iPtr->varFramePtr = iPtr->rootFramePtr;
}

static int
TEOV_RestoreVarFrame(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    ((Interp *) interp)->varFramePtr = data[0];
    return result;
}

static int
TEOV_Exception(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    int allowExceptions = (PTR2INT(data[0]) & TCL_ALLOW_EXCEPTIONS);

    if (result != TCL_OK) {
	if (result == TCL_RETURN) {
	    result = TclUpdateReturnInfo(iPtr);
	}
	if ((result != TCL_ERROR) && !allowExceptions) {
	    ProcessUnexpectedResult(interp, result);
	    result = TCL_ERROR;
	}
    }

    /*
     * We are returning to level 0, so should process TclResetCancellation. As
     * numLevels has not *yet* been decreased, do not call it: do the thing
     * here directly.
     */

    iPtr->flags &= (~(CANCELED | TCL_CANCEL_UNWIND));
    return result;
}

static int
TEOV_Error(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *listPtr;
    char *cmdString;
    int cmdLen;
    int objc = PTR2INT(data[0]);
    Tcl_Obj **objv = data[1];

    if ((result == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)){
	/*
	 * If there was an error, a command string will be needed for the
	 * error log: get it out of the itemPtr. The details depend on the
	 * type
	 */

	listPtr = Tcl_NewListObj(objc, objv);
	cmdString = Tcl_GetStringFromObj(listPtr, &cmdLen);
	Tcl_LogCommandInfo(interp, cmdString, cmdString, cmdLen);
	Tcl_DecrRefCount(listPtr);
    }
    iPtr->flags &= ~ERR_ALREADY_LOGGED;
    return result;
}

static int
TEOV_NotFound(
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[],
    Namespace *lookupNsPtr)
{
    Command * cmdPtr;
    Interp *iPtr = (Interp *) interp;
    int i, newObjc, handlerObjc;
    Tcl_Obj **newObjv, **handlerObjv;
    CallFrame *varFramePtr = iPtr->varFramePtr;
    int result = TCL_OK;
    Namespace *currNsPtr = NULL;/* Used to check for and invoke any registered
				 * unknown command handler for the current
				 * namespace (TIP 181). */
    Namespace *savedNsPtr = NULL;

    currNsPtr = varFramePtr->nsPtr;
    if ((currNsPtr == NULL) || (currNsPtr->unknownHandlerPtr == NULL)) {
	currNsPtr = iPtr->globalNsPtr;
	if (currNsPtr == NULL) {
	    Tcl_Panic("Tcl_EvalObjv: NULL global namespace pointer");
	}
    }

    /*
     * Check to see if the resolution namespace has lost its unknown handler.
     * If so, reset it to "::unknown".
     */

    if (currNsPtr->unknownHandlerPtr == NULL) {
	TclNewLiteralStringObj(currNsPtr->unknownHandlerPtr, "::unknown");
	Tcl_IncrRefCount(currNsPtr->unknownHandlerPtr);
    }

    /*
     * Get the list of words for the unknown handler and allocate enough space
     * to hold both the handler prefix and all words of the command invokation
     * itself.
     */

    Tcl_ListObjGetElements(NULL, currNsPtr->unknownHandlerPtr,
	    &handlerObjc, &handlerObjv);
    newObjc = objc + handlerObjc;
    newObjv = TclStackAlloc(interp, (int) sizeof(Tcl_Obj *) * newObjc);

    /*
     * Copy command prefix from unknown handler and add on the real command's
     * full argument list. Note that we only use memcpy() once because we have
     * to increment the reference count of all the handler arguments anyway.
     */

    for (i = 0; i < handlerObjc; ++i) {
	newObjv[i] = handlerObjv[i];
	Tcl_IncrRefCount(newObjv[i]);
    }
    memcpy(newObjv+handlerObjc, objv, sizeof(Tcl_Obj *) * (unsigned)objc);

    /*
     * Look up and invoke the handler (by recursive call to this function). If
     * there is no handler at all, instead of doing the recursive call we just
     * generate a generic error message; it would be an infinite-recursion
     * nightmare otherwise.
     *
     * In this case we worry a bit less about recursion for now, and call the
     * "blocking" interface.
     */

    cmdPtr = TEOV_LookupCmdFromObj(interp, newObjv[0], lookupNsPtr);
    if (cmdPtr == NULL) {
	Tcl_AppendResult(interp, "invalid command name \"",
		TclGetString(objv[0]), "\"", NULL);
	result = TCL_ERROR;
    } else {
	if (lookupNsPtr) {
	    savedNsPtr = varFramePtr->nsPtr;
	    varFramePtr->nsPtr = lookupNsPtr;
	}
	result = Tcl_EvalObjv(interp, newObjc, newObjv, TCL_EVAL_NOERR);
	if (savedNsPtr) {
	    varFramePtr->nsPtr = savedNsPtr;
	}
    }

    /*
     * Release any resources we locked and allocated during the handler call.
     */

    for (i = 0; i < handlerObjc; ++i) {
	Tcl_DecrRefCount(newObjv[i]);
    }
    TclStackFree(interp, newObjv);
    return result;
}

static int
TEOV_RunEnterTraces(
    Tcl_Interp *interp,
    Command **cmdPtrPtr,
    int objc,
    Tcl_Obj *const objv[],
    Namespace *lookupNsPtr)
{
    Interp *iPtr = (Interp *) interp;
    Command *cmdPtr = *cmdPtrPtr;
    int traceCode = TCL_OK;
    int cmdEpoch = cmdPtr->cmdEpoch;
    int newEpoch;
    char *command;
    int length;
    Tcl_Obj *commandPtr;

    commandPtr = GetCommandSource(iPtr, objc, objv, 1);
    command = Tcl_GetStringFromObj(commandPtr, &length);

    /*
     * Call trace functions.
     * Execute any command or execution traces. Note that we bump up the
     * command's reference count for the duration of the calling of the traces
     * so that the structure doesn't go away underneath our feet.
     */

    cmdPtr->refCount++;
    if (iPtr->tracePtr) {
	traceCode = TclCheckInterpTraces(interp, command, length,
		cmdPtr, TCL_OK, TCL_TRACE_ENTER_EXEC, objc, objv);
    }
    if ((cmdPtr->flags & CMD_HAS_EXEC_TRACES) && (traceCode == TCL_OK)) {
	traceCode = TclCheckExecutionTraces(interp, command, length,
		cmdPtr, TCL_OK, TCL_TRACE_ENTER_EXEC, objc, objv);
    }
    newEpoch = cmdPtr->cmdEpoch;
    TclCleanupCommandMacro(cmdPtr);

    /*
     * If the traces modified/deleted the command or any existing traces, they
     * will update the command's epoch. We need to lookup again, but do not
     * run enter traces on the newly found cmdPtr.
     */

    if (cmdEpoch != newEpoch) {
	cmdPtr = TEOV_LookupCmdFromObj(interp, objv[0], lookupNsPtr);
	*cmdPtrPtr = cmdPtr;
    }

    if (cmdPtr) {
	/*
	 * Command was found: push a record to schedule the leave traces.
	 */

	TclNRAddCallback(interp, TEOV_RunLeaveTraces, INT2PTR(traceCode),
		commandPtr, cmdPtr, NULL);
	cmdPtr->refCount++;
    } else {
	Tcl_DecrRefCount(commandPtr);
    }
    return traceCode;
}

static int
TEOV_RunLeaveTraces(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    char *command;
    int length, objc;
    Tcl_Obj **objv;
    int traceCode = PTR2INT(data[0]);
    Tcl_Obj *commandPtr = data[1];
    Command *cmdPtr = data[2];

    command = Tcl_GetStringFromObj(commandPtr, &length);
    if (TCL_OK != Tcl_ListObjGetElements(interp, commandPtr, &objc, &objv)) {
	Tcl_Panic("Who messed with commandPtr?");
    }

    if (!(cmdPtr->flags & CMD_IS_DELETED)) {
	if ((cmdPtr->flags & CMD_HAS_EXEC_TRACES) && traceCode == TCL_OK){
	    traceCode = TclCheckExecutionTraces(interp, command, length,
		    cmdPtr, result, TCL_TRACE_LEAVE_EXEC, objc, objv);
	}
	if (iPtr->tracePtr != NULL && traceCode == TCL_OK) {
	    traceCode = TclCheckInterpTraces(interp, command, length,
		    cmdPtr, result, TCL_TRACE_LEAVE_EXEC, objc, objv);
	}
    }
    Tcl_DecrRefCount(commandPtr);

    /*
     * As cmdPtr is set, TclNRRunCallbacks is about to reduce the numlevels.
     * Prevent that by resetting the cmdPtr field and dealing right here with
     * cmdPtr->refCount.
     */

    TclCleanupCommandMacro(cmdPtr);

    if (traceCode != TCL_OK) {
	return traceCode;
    }
    return result;
}

static inline Command *
TEOV_LookupCmdFromObj(
    Tcl_Interp *interp,
    Tcl_Obj *namePtr,
    Namespace *lookupNsPtr)
{
    Interp *iPtr = (Interp *) interp;
    Command *cmdPtr;
    Namespace *savedNsPtr = iPtr->varFramePtr->nsPtr;

    if (lookupNsPtr) {
	iPtr->varFramePtr->nsPtr = lookupNsPtr;
	iPtr->lookupNsPtr = NULL;
    }
    cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, namePtr);
    iPtr->varFramePtr->nsPtr = savedNsPtr;
    return cmdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalTokensStandard --
 *
 *	Given an array of tokens parsed from a Tcl command (e.g., the tokens
 *	that make up a word or the index for an array variable) this function
 *	evaluates the tokens and concatenates their values to form a single
 *	result value.
 *
 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. A result or error message is left in interp's result.
 *
 * Side effects:
 *	Depends on the array of tokens being evaled.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_EvalTokensStandard(
    Tcl_Interp *interp,		/* Interpreter in which to lookup variables,
				 * execute nested commands, and report
				 * errors. */
    Tcl_Token *tokenPtr,	/* Pointer to first in an array of tokens to
				 * evaluate and concatenate. */
    int count)			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
{
    return TclSubstTokens(interp, tokenPtr, count, /* numLeftPtr */ NULL, 1);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalTokens --
 *
 *	Given an array of tokens parsed from a Tcl command (e.g., the tokens
 *	that make up a word or the index for an array variable) this function
 *	evaluates the tokens and concatenates their values to form a single
 *	result value.
 *
 * Results:
 *	The return value is a pointer to a newly allocated Tcl_Obj containing
 *	the value of the array of tokens. The reference count of the returned
 *	object has been incremented. If an error occurs in evaluating the
 *	tokens then a NULL value is returned and an error message is left in
 *	interp's result.
 *
 * Side effects:
 *	A new object is allocated to hold the result.
 *
 *----------------------------------------------------------------------
 *
 * This uses a non-standard return convention; its use is now deprecated. It
 * is a wrapper for the new function Tcl_EvalTokensStandard, and is not used
 * in the core any longer. It is only kept for backward compatibility.
 */

Tcl_Obj *
Tcl_EvalTokens(
    Tcl_Interp *interp,		/* Interpreter in which to lookup variables,
				 * execute nested commands, and report
				 * errors. */
    Tcl_Token *tokenPtr,	/* Pointer to first in an array of tokens to
				 * evaluate and concatenate. */
    int count)			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
{
    Tcl_Obj *resPtr;

    if (Tcl_EvalTokensStandard(interp, tokenPtr, count) != TCL_OK) {
	return NULL;
    }
    resPtr = Tcl_GetObjResult(interp);
    Tcl_IncrRefCount(resPtr);
    Tcl_ResetResult(interp);
    return resPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalEx, TclEvalEx --
 *
 *	This function evaluates a Tcl script without using the compiler or
 *	byte-code interpreter. It just parses the script, creates values for
 *	each word of each command, then calls EvalObjv to execute each
 *	command.
 *
 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. A result or error message is left in interp's result.
 *
 * Side effects:
 *	Depends on the script.
 *
 * TIP #280 : Keep public API, internally extended API.
 *----------------------------------------------------------------------
 */

int
Tcl_EvalEx(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * script. Also used for error reporting. */
    const char *script,		/* First character of script to evaluate. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first null character. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL is currently supported. */
{
    return TclEvalEx(interp, script, numBytes, flags, 1);
}

int
TclEvalEx(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * script. Also used for error reporting. */
    const char *script,		/* First character of script to evaluate. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first NUL character. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL is currently supported. */
    int line)			/* The line the script starts on. */
{
    Interp *iPtr = (Interp *) interp;
    const char *p, *next;
    const unsigned int minObjs = 20;
    Tcl_Obj **objv, **objvSpace;
    int *expand, *lines, *lineSpace;
    Tcl_Token *tokenPtr;
    int commandLength, bytesLeft, expandRequested, code = TCL_OK;
    CallFrame *savedVarFramePtr;/* Saves old copy of iPtr->varFramePtr in case
				 * TCL_EVAL_GLOBAL was set. */
    int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
    int gotParse = 0;
    unsigned int i, objectsUsed = 0;
				/* These variables keep track of how much
				 * state has been allocated while evaluating
				 * the script, so that it can be freed
				 * properly if an error occurs. */
    Tcl_Parse *parsePtr = TclStackAlloc(interp, sizeof(Tcl_Parse));
    CmdFrame *eeFramePtr = TclStackAlloc(interp, sizeof(CmdFrame));
    Tcl_Obj **stackObjArray =
	    TclStackAlloc(interp, minObjs * sizeof(Tcl_Obj *));
    int *expandStack = TclStackAlloc(interp, minObjs * sizeof(int));
    int *linesStack = TclStackAlloc(interp, minObjs * sizeof(int));
				/* TIP #280 Structures for tracking of command
				 * locations. */

    if (numBytes < 0) {
	numBytes = strlen(script);
    }
    Tcl_ResetResult(interp);

    savedVarFramePtr = iPtr->varFramePtr;
    if (flags & TCL_EVAL_GLOBAL) {
	iPtr->varFramePtr = iPtr->rootFramePtr;
    }

    /*
     * Each iteration through the following loop parses the next command from
     * the script and then executes it.
     */

    objv = objvSpace = stackObjArray;
    lines = lineSpace = linesStack;
    expand = expandStack;
    p = script;
    bytesLeft = numBytes;

    /*
     * TIP #280 Initialize tracking. Do not push on the frame stack yet.
     *
     * We may cont. counting based on a specific context (CTX), or open a new
     * context, either for a sourced script, or 'eval'. For sourced files we
     * always have a path object, even if nothing was specified in the interp
     * itself. That makes code using it simpler as NULL checks can be left
     * out. Sourced file without path in the 'scriptFile' is possible during
     * Tcl initialization.
     */

    eeFramePtr->level = iPtr->cmdFramePtr ? iPtr->cmdFramePtr->level + 1 : 1;
    eeFramePtr->numLevels = iPtr->numLevels;
    eeFramePtr->framePtr = iPtr->framePtr;
    eeFramePtr->nextPtr = iPtr->cmdFramePtr;
    eeFramePtr->nline = 0;
    eeFramePtr->line = NULL;

    iPtr->cmdFramePtr = eeFramePtr;
    if (iPtr->evalFlags & TCL_EVAL_CTX) {
	/*
	 * Path information comes out of the context.
	 */

	eeFramePtr->type = TCL_LOCATION_SOURCE;
	eeFramePtr->data.eval.path = iPtr->invokeCmdFramePtr->data.eval.path;
	Tcl_IncrRefCount(eeFramePtr->data.eval.path);
    } else if (iPtr->evalFlags & TCL_EVAL_FILE) {
	/*
	 * Set up for a sourced file.
	 */

	eeFramePtr->type = TCL_LOCATION_SOURCE;

	if (iPtr->scriptFile) {
	    /*
	     * Normalization here, to have the correct pwd. Should have
	     * negligible impact on performance, as the norm should have been
	     * done already by the 'source' invoking us, and it caches the
	     * result.
	     */

	    Tcl_Obj *norm = Tcl_FSGetNormalizedPath(interp, iPtr->scriptFile);

	    if (norm == NULL) {
		/*
		 * Error message in the interp result.
		 */

		code = TCL_ERROR;
		goto error;
	    }
	    eeFramePtr->data.eval.path = norm;
	} else {
	    TclNewLiteralStringObj(eeFramePtr->data.eval.path, "");
	}
	Tcl_IncrRefCount(eeFramePtr->data.eval.path);
    } else {
	/*
	 * Set up for plain eval.
	 */

	eeFramePtr->type = TCL_LOCATION_EVAL;
	eeFramePtr->data.eval.path = NULL;
    }

    iPtr->evalFlags = 0;
    do {
	if (Tcl_ParseCommand(interp, p, bytesLeft, 0, parsePtr) != TCL_OK) {
	    code = TCL_ERROR;
	    goto error;
	}

	/*
	 * TIP #280 Track lines. The parser may have skipped text till it
	 * found the command we are now at. We have to count the lines in this
	 * block.
	 */

	TclAdvanceLines(&line, p, parsePtr->commandStart);

	gotParse = 1;
	if (parsePtr->numWords > 0) {
	    /*
	     * TIP #280. Track lines within the words of the current command.
	     */

	    int wordLine = line;
	    const char *wordStart = parsePtr->commandStart;

	    /*
	     * Generate an array of objects for the words of the command.
	     */

 	    unsigned int objectsNeeded = 0;
	    unsigned int numWords = parsePtr->numWords;

	    if (numWords > minObjs) {
		expand = (int *) ckalloc(numWords * sizeof(int));
		objvSpace = (Tcl_Obj **)
			ckalloc(numWords * sizeof(Tcl_Obj *));
		lineSpace = (int *) ckalloc(numWords * sizeof(int));
	    }
	    expandRequested = 0;
	    objv = objvSpace;
	    lines = lineSpace;

	    iPtr->cmdFramePtr = eeFramePtr->nextPtr;
	    for (objectsUsed = 0, tokenPtr = parsePtr->tokenPtr;
		    objectsUsed < numWords;
		    objectsUsed++, tokenPtr += tokenPtr->numComponents+1) {
		/*
		 * TIP #280. Track lines to current word. Save the information
		 * on a per-word basis, signaling dynamic words as needed.
		 * Make the information available to the recursively called
		 * evaluator as well, including the type of context (source
		 * vs. eval).
		 */

		TclAdvanceLines(&wordLine, wordStart, tokenPtr->start);
		wordStart = tokenPtr->start;

		lines[objectsUsed] = TclWordKnownAtCompileTime(tokenPtr, NULL)
			? wordLine : -1;

		if (eeFramePtr->type == TCL_LOCATION_SOURCE) {
		    iPtr->evalFlags |= TCL_EVAL_FILE;
		}

		code = TclSubstTokens(interp, tokenPtr+1,
			tokenPtr->numComponents, NULL, wordLine);

		iPtr->evalFlags = 0;

		if (code != TCL_OK) {
		    break;
		}
		objv[objectsUsed] = Tcl_GetObjResult(interp);
		Tcl_IncrRefCount(objv[objectsUsed]);
		if (tokenPtr->type == TCL_TOKEN_EXPAND_WORD) {
		    int numElements;

		    code = TclListObjLength(interp, objv[objectsUsed],
			    &numElements);
		    if (code == TCL_ERROR) {
			/*
			 * Attempt to expand a non-list.
			 */

			Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
				"\n    (expanding word %d)", objectsUsed));
			Tcl_DecrRefCount(objv[objectsUsed]);
			break;
		    }
		    expandRequested = 1;
		    expand[objectsUsed] = 1;

		    objectsNeeded += (numElements ? numElements : 1);
		} else {
		    expand[objectsUsed] = 0;
		    objectsNeeded++;
		}
	    } /* for loop */
	    iPtr->cmdFramePtr = eeFramePtr;
	    if (code != TCL_OK) {
		goto error;
	    }
	    if (expandRequested) {
		/*
		 * Some word expansion was requested. Check for objv resize.
		 */

		Tcl_Obj **copy = objvSpace;
		int *lcopy = lineSpace;
		int wordIdx = numWords;
		int objIdx = objectsNeeded - 1;

		if ((numWords > minObjs) || (objectsNeeded > minObjs)) {
		    objv = objvSpace = (Tcl_Obj **)
			    ckalloc(objectsNeeded * sizeof(Tcl_Obj *));
		    lines = lineSpace = (int *)
			    ckalloc(objectsNeeded * sizeof(int));
		}

		objectsUsed = 0;
		while (wordIdx--) {
		    if (expand[wordIdx]) {
			int numElements;
			Tcl_Obj **elements, *temp = copy[wordIdx];

			Tcl_ListObjGetElements(NULL, temp, &numElements,
				&elements);
			objectsUsed += numElements;
			while (numElements--) {
			    lines[objIdx] = -1;
			    objv[objIdx--] = elements[numElements];
			    Tcl_IncrRefCount(elements[numElements]);
			}
			Tcl_DecrRefCount(temp);
		    } else {
			lines[objIdx] = lcopy[wordIdx];
			objv[objIdx--] = copy[wordIdx];
			objectsUsed++;
		    }
		}
		objv += objIdx+1;

		if (copy != stackObjArray) {
		    ckfree((char *) copy);
		}
		if (lcopy != linesStack) {
		    ckfree((char *) lcopy);
		}
	    }

	    /*
	     * Execute the command and free the objects for its words.
	     *
	     * TIP #280: Remember the command itself for 'info frame'. We
	     * shorten the visible command by one char to exclude the
	     * termination character, if necessary. Here is where we put our
	     * frame on the stack of frames too. _After_ the nested commands
	     * have been executed.
	     */

	    eeFramePtr->cmd.str.cmd = parsePtr->commandStart;
	    eeFramePtr->cmd.str.len = parsePtr->commandSize;

	    if (parsePtr->term ==
		    parsePtr->commandStart + parsePtr->commandSize - 1) {
		eeFramePtr->cmd.str.len--;
	    }

	    eeFramePtr->nline = objectsUsed;
	    eeFramePtr->line = lines;

	    TclArgumentEnter(interp, objv, objectsUsed, eeFramePtr);
	    code = Tcl_EvalObjv(interp, objectsUsed, objv, TCL_EVAL_NOERR);
	    TclArgumentRelease(interp, objv, objectsUsed);

	    eeFramePtr->line = NULL;
	    eeFramePtr->nline = 0;

	    if (code != TCL_OK) {
		goto error;
	    }
	    for (i = 0; i < objectsUsed; i++) {
		Tcl_DecrRefCount(objv[i]);
	    }
	    objectsUsed = 0;
	    if (objvSpace != stackObjArray) {
		ckfree((char *) objvSpace);
		objvSpace = stackObjArray;
		ckfree((char *) lineSpace);
		lineSpace = linesStack;
	    }

	    /*
	     * Free expand separately since objvSpace could have been
	     * reallocated above.
	     */

	    if (expand != expandStack) {
		ckfree((char *) expand);
		expand = expandStack;
	    }
	}

	/*
	 * Advance to the next command in the script.
	 *
	 * TIP #280 Track Lines. Now we track how many lines were in the
	 * executed command.
	 */

	next = parsePtr->commandStart + parsePtr->commandSize;
	bytesLeft -= next - p;
	p = next;
	TclAdvanceLines(&line, parsePtr->commandStart, p);
	Tcl_FreeParse(parsePtr);
	gotParse = 0;
    } while (bytesLeft > 0);
    iPtr->varFramePtr = savedVarFramePtr;
    code = TCL_OK;
    goto cleanup_return;

  error:
    /*
     * Generate and log various pieces of error information.
     */

    if (iPtr->numLevels == 0) {
	if (code == TCL_RETURN) {
	    code = TclUpdateReturnInfo(iPtr);
	}
	if ((code != TCL_OK) && (code != TCL_ERROR) && !allowExceptions) {
	    ProcessUnexpectedResult(interp, code);
	    code = TCL_ERROR;
	}
    }
    if ((code == TCL_ERROR) && !(iPtr->flags & ERR_ALREADY_LOGGED)) {
	commandLength = parsePtr->commandSize;
	if (parsePtr->term == parsePtr->commandStart + commandLength - 1) {
	    /*
	     * The terminator character (such as ; or ]) of the command where
	     * the error occurred is the last character in the parsed command.
	     * Reduce the length by one so that the error message doesn't
	     * include the terminator character.
	     */

	    commandLength -= 1;
	}
	Tcl_LogCommandInfo(interp, script, parsePtr->commandStart,
		commandLength);
    }
    iPtr->flags &= ~ERR_ALREADY_LOGGED;

    /*
     * Then free resources that had been allocated to the command.
     */

    for (i = 0; i < objectsUsed; i++) {
	Tcl_DecrRefCount(objv[i]);
    }
    if (gotParse) {
	Tcl_FreeParse(parsePtr);
    }
    if (objvSpace != stackObjArray) {
	ckfree((char *) objvSpace);
	ckfree((char *) lineSpace);
    }
    if (expand != expandStack) {
	ckfree((char *) expand);
    }
    iPtr->varFramePtr = savedVarFramePtr;

 cleanup_return:
    /*
     * TIP #280. Release the local CmdFrame, and its contents.
     */

    iPtr->cmdFramePtr = iPtr->cmdFramePtr->nextPtr;
    if (eeFramePtr->type == TCL_LOCATION_SOURCE) {
	Tcl_DecrRefCount(eeFramePtr->data.eval.path);
    }
    TclStackFree(interp, linesStack);
    TclStackFree(interp, expandStack);
    TclStackFree(interp, stackObjArray);
    TclStackFree(interp, eeFramePtr);
    TclStackFree(interp, parsePtr);

    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * TclAdvanceLines --
 *
 *	This function is a helper which counts the number of lines in a block
 *	of text and advances an external counter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The specified counter is advanced per the number of lines found.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclAdvanceLines(
    int *line,
    const char *start,
    const char *end)
{
    register const char *p;

    for (p = start; p < end; p++) {
	if (*p == '\n') {
	    (*line)++;
	}
    }
}

/*
 *----------------------------------------------------------------------
 * Note: The whole data structure access for argument location tracking is
 * hidden behind these three functions. The only parts open are the lineLAPtr
 * field in the Interp structure. The CFWord definition is internal to here.
 * Should make it easier to redo the data structures if we find something more
 * space/time efficient.
 */

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentEnter --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	enters location references for the arguments of a command to be
 *	invoked. Only the first entry has the actual data, further entries
 *	simply count the usage up.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May allocate memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentEnter(
    Tcl_Interp *interp,
    Tcl_Obj **objv,
    int objc,
    CmdFrame *cfPtr)
{
    Interp *iPtr = (Interp *) interp;
    int new, i;
    Tcl_HashEntry *hPtr;
    CFWord *cfwPtr;

    for (i = 1; i < objc; i++) {
	/*
	 * Ignore argument words without line information (= dynamic). If they
	 * are variables they may have location information associated with
	 * that, either through globally recorded 'set' invokations, or
	 * literals in bytecode. Eitehr way there is no need to record
	 * something here.
	 */

	if (cfPtr->line[i] < 0) {
	    continue;
	}
	hPtr = Tcl_CreateHashEntry(iPtr->lineLAPtr, (char *) objv[i], &new);
	if (new) {
	    /*
	     * The word is not on the stack yet, remember the current location
	     * and initialize references.
	     */

	    cfwPtr = (CFWord *) ckalloc(sizeof(CFWord));
	    cfwPtr->framePtr = cfPtr;
	    cfwPtr->word = i;
	    cfwPtr->refCount = 1;
	    Tcl_SetHashValue(hPtr, cfwPtr);
	} else {
	    /*
	     * The word is already on the stack, its current location is not
	     * relevant. Just remember the reference to prevent early removal.
	     */

	    cfwPtr = Tcl_GetHashValue(hPtr);
	    cfwPtr->refCount++;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentRelease --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension.
 *	It removes the location references for the arguments of a command
 *	just done. Usage is counted down, the data is removed only when
 *	no user is left over.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May release memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentRelease(
    Tcl_Interp *interp,
    Tcl_Obj **objv,
    int objc)
{
    Interp *iPtr = (Interp *) interp;
    int i;

    for (i = 1; i < objc; i++) {
	CFWord *cfwPtr;
	Tcl_HashEntry *hPtr = Tcl_FindHashEntry(iPtr->lineLAPtr,
		(char *) objv[i]);

	if (!hPtr) {
	    continue;
	}
	cfwPtr = (CFWord *) Tcl_GetHashValue(hPtr);

	cfwPtr->refCount--;
	if (cfwPtr->refCount > 0) {
	    continue;
	}

	ckfree((char *) cfwPtr);
	Tcl_DeleteHashEntry(hPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentBCEnter --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	enters location references for the literal arguments of commands in
 *	bytecode about to be invoked. Only the first entry has the actual
 *	data, further entries simply count the usage up.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May allocate memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentBCEnter(
     Tcl_Interp *interp,
     void *codePtr,
     CmdFrame *cfPtr)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hePtr = Tcl_FindHashEntry(iPtr->lineBCPtr,
	    (char *) codePtr);

    if (hePtr) {
	ExtCmdLoc *eclPtr = Tcl_GetHashValue(hePtr);
	int i;

	for (i = 0; i < eclPtr->nueiloc; i++) {
	    ExtIndex *eiPtr = &eclPtr->eiloc[i];
	    Tcl_Obj *obj = eiPtr->obj;
	    int new;
	    Tcl_HashEntry *hPtr;
	    CFWordBC *cfwPtr;

	    hPtr = Tcl_CreateHashEntry(iPtr->lineLABCPtr, (char *) obj, &new);
	    if (new) {
		/*
		 * The word is not on the stack yet, remember the current
		 * location and initialize references.
		 */

		cfwPtr = (CFWordBC *) ckalloc(sizeof(CFWordBC));
		cfwPtr->framePtr = cfPtr;
		cfwPtr->eiPtr = eiPtr;
		cfwPtr->refCount = 1;
		Tcl_SetHashValue(hPtr, cfwPtr);
	    } else {
		/*
		 * The word is already on the stack, its current location is
		 * not relevant. Just remember the reference to prevent early
		 * removal.
		 */

		cfwPtr = Tcl_GetHashValue(hPtr);
		cfwPtr->refCount++;
	    }
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentBCRelease --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension. It
 *	removes the location references for the literal arguments of commands
 *	in bytecode just done. Usage is counted down, the data is removed only
 *	when no user is left over.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May release memory.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentBCRelease(
     Tcl_Interp *interp,
     void *codePtr)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hePtr = Tcl_FindHashEntry(iPtr->lineBCPtr,
	    (char *) codePtr);

    if (hePtr) {
	ExtCmdLoc *eclPtr = Tcl_GetHashValue(hePtr);
	int i;

	for (i = 0; i < eclPtr->nueiloc; i++) {
	    Tcl_Obj *obj = eclPtr->eiloc[i].obj;
	    Tcl_HashEntry *hPtr = Tcl_FindHashEntry(iPtr->lineLABCPtr,
		    (char *) obj);
	    CFWordBC *cfwPtr;

	    if (!hPtr) {
		continue;
	    }

	    cfwPtr = Tcl_GetHashValue(hPtr);

	    cfwPtr->refCount--;
	    if (cfwPtr->refCount > 0) {
		continue;
	    }

	    ckfree((char *) cfwPtr);
	    Tcl_DeleteHashEntry(hPtr);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclArgumentGet --
 *
 *	This procedure is a helper for the TIP #280 uplevel extension.
 *	It find the location references for a Tcl_Obj, if any.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Writes found location information into the result arguments.
 *
 * TIP #280
 *----------------------------------------------------------------------
 */

void
TclArgumentGet(
    Tcl_Interp *interp,
    Tcl_Obj *obj,
    CmdFrame **cfPtrPtr,
    int *wordPtr)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_HashEntry *hPtr;
    CmdFrame *framePtr;

    /*
     * An object which either has no string rep or else is a canonical list is
     * guaranteed to have been generated dynamically: bail out, this cannot
     * have a usable absolute location. _Do not touch_ the information the set
     * up by the caller. It knows better than us.
     */

    if ((!obj->bytes) || ((obj->typePtr == &tclListType) &&
	    ((List *)obj->internalRep.twoPtrValue.ptr1)->canonicalFlag)) {
	return;
    }

    /*
     * First look for location information recorded in the argument
     * stack. That is nearest.
     */

    hPtr = Tcl_FindHashEntry(iPtr->lineLAPtr, (char *) obj);
    if (hPtr) {
	CFWord *cfwPtr = Tcl_GetHashValue(hPtr);

	*wordPtr = cfwPtr->word;
	*cfPtrPtr = cfwPtr->framePtr;
	return;
    }

    /*
     * Check if the Tcl_Obj has location information as a bytecode literal, in
     * that stack.
     */

    hPtr = Tcl_FindHashEntry(iPtr->lineLABCPtr, (char *) obj);
    if (hPtr) {
	CFWordBC *cfwPtr = Tcl_GetHashValue(hPtr);
	ExtIndex *eiPtr = cfwPtr->eiPtr;

	framePtr = cfwPtr->framePtr;
	framePtr->data.tebc.pc = (char *) (((ByteCode *)
		framePtr->data.tebc.codePtr)->codeStart + eiPtr->pc);
	*cfPtrPtr = cfwPtr->framePtr;
	*wordPtr = eiPtr->word;
	return;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Eval --
 *
 *	Execute a Tcl command in a string. This function executes the script
 *	directly, rather than compiling it to bytecodes. Before the arrival of
 *	the bytecode compiler in Tcl 8.0 Tcl_Eval was the main function used
 *	for executing Tcl commands, but nowadays it isn't used much.
 *
 * Results:
 *	The return value is one of the return codes defined in tcl.h (such as
 *	TCL_OK), and interp's result contains a value to supplement the return
 *	code. The value of the result will persist only until the next call to
 *	Tcl_Eval or Tcl_EvalObj: you must copy it or lose it!
 *
 * Side effects:
 *	Can be almost arbitrary, depending on the commands in the script.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_Eval(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * previous call to Tcl_CreateInterp). */
    const char *script)		/* Pointer to TCL command to execute. */
{
    int code = Tcl_EvalEx(interp, script, -1, 0);

    /*
     * For backwards compatibility with old C code that predates the object
     * system in Tcl 8.0, we have to mirror the object result back into the
     * string result (some callers may expect it there).
     */

    (void) Tcl_GetStringResult(interp);
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalObj, Tcl_GlobalEvalObj --
 *
 *	These functions are deprecated but we keep them around for backwards
 *	compatibility reasons.
 *
 * Results:
 *	See the functions they call.
 *
 * Side effects:
 *	See the functions they call.
 *
 *----------------------------------------------------------------------
 */

#undef Tcl_EvalObj
int
Tcl_EvalObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr)
{
    return Tcl_EvalObjEx(interp, objPtr, 0);
}
#undef Tcl_GlobalEvalObj
int
Tcl_GlobalEvalObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr)
{
    return Tcl_EvalObjEx(interp, objPtr, TCL_EVAL_GLOBAL);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalObjEx, TclEvalObjEx --
 *
 *	Execute Tcl commands stored in a Tcl object. These commands are
 *	compiled into bytecodes if necessary, unless TCL_EVAL_DIRECT is
 *	specified.
 *
 * Results:
 *	The return value is one of the return codes defined in tcl.h (such as
 *	TCL_OK), and the interpreter's result contains a value to supplement
 *	the return code.
 *
 * Side effects:
 *	The object is converted, if necessary, to a ByteCode object that holds
 *	the bytecode instructions for the commands. Executing the commands
 *	will almost certainly have side effects that depend on those commands.
 *
 * TIP #280 : Keep public API, internally extended API.
 *----------------------------------------------------------------------
 */

int
Tcl_EvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
{
    return TclEvalObjEx(interp, objPtr, flags, NULL, 0);
}

int
TclEvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
    const CmdFrame *invoker,	/* Frame of the command doing the eval. */
    int word)			/* Index of the word which is in objPtr. */
{
    int result = TCL_OK;
    TEOV_callback *rootPtr = TOP_CB(interp);

    result = TclNREvalObjEx(interp, objPtr, flags, invoker, word);
    return TclNRRunCallbacks(interp, result, rootPtr, 0);
}

int
TclNREvalObjEx(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * a previous call to Tcl_CreateInterp). */
    register Tcl_Obj *objPtr,	/* Pointer to object containing commands to
				 * execute. */
    int flags,			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Supported values
				 * are TCL_EVAL_GLOBAL and TCL_EVAL_DIRECT. */
    const CmdFrame *invoker,	/* Frame of the command doing the eval. */
    int word)			/* Index of the word which is in objPtr. */
{
    Interp *iPtr = (Interp *) interp;
    int result;
    List *listRepPtr = objPtr->internalRep.twoPtrValue.ptr1;

    /*
     * This function consists of three independent blocks for: direct
     * evaluation of canonical lists, compileation and bytecode execution and
     * finally direct evaluation. Precisely one of these blocks will be run.
     */

    if ((objPtr->typePtr == &tclListType) &&	   /* is a list... */
	    ((objPtr->bytes == NULL ||		   /* ...without a string rep */
		    listRepPtr->canonicalFlag))) { /* ...or that is canonical */
	Tcl_Obj *listPtr = objPtr;
	CmdFrame *eoFramePtr = NULL;
	int objc;
	Tcl_Obj **objv;

	/*
	 * Pure List Optimization (no string representation). In this case, we
	 * can safely use Tcl_EvalObjv instead and get an appreciable
	 * improvement in execution speed. This is because it allows us to
	 * avoid a setFromAny step that would just pack everything into a
	 * string and back out again.
	 *
	 * This also preserves any associations between list elements and
	 * location information for such elements.
	 *
	 * This restriction has been relaxed a bit by storing in lists whether
	 * they are "canonical" or not (a canonical list being one that is
	 * either pure or that has its string rep derived by
	 * UpdateStringOfList from the internal rep).
	 */

	if (word != INT_MIN) {
	    /*
	     * TIP #280 Structures for tracking lines. As we know that this is
	     * dynamic execution we ignore the invoker, even if known.
	     *
	     * TIP #280. We do _not_ compute all the line numbers for the
	     * words in the command. For the eval of a pure list the most
	     * sensible choice is to put all words on line 1. Given that we
	     * neither need memory for them nor compute anything. 'line' is
	     * left NULL. The two places using this information (TclInfoFrame,
	     * and TclInitCompileEnv), are special-cased to use the proper
	     * line number directly instead of accessing the 'line' array.
	     *
	     * Note that we use (word==INTMIN) to signal that no command frame
	     * should be pushed, as needed by alias and ensemble redirections.
	     */

	    eoFramePtr = TclStackAlloc(interp, sizeof(CmdFrame));
	    eoFramePtr->nline = 0;
	    eoFramePtr->line = NULL;

	    eoFramePtr->type = TCL_LOCATION_EVAL_LIST;
	    eoFramePtr->level = (iPtr->cmdFramePtr == NULL?
		    1 : iPtr->cmdFramePtr->level + 1);
	    eoFramePtr->numLevels = iPtr->numLevels;
	    eoFramePtr->framePtr = iPtr->framePtr;
	    eoFramePtr->nextPtr = iPtr->cmdFramePtr;

	    eoFramePtr->cmd.listPtr = objPtr;
	    eoFramePtr->data.eval.path = NULL;

	    iPtr->cmdFramePtr = eoFramePtr;
	}

	/*
	 * Shimmer protection! Always pass an unshared obj. The caller could
	 * incr the refCount of objPtr AFTER calling us! To be completely safe
	 * we always make a copy. The callback takes care od the refCounts for
	 * both listPtr and objPtr.
	 *
	 * FIXME OPT: preserve just the internal rep?
	 */

	Tcl_IncrRefCount(objPtr);
	listPtr = TclListObjCopy(interp, objPtr);
	Tcl_IncrRefCount(listPtr);
	TclNRAddCallback(interp, TEOEx_ListCallback, objPtr, eoFramePtr,
		listPtr, NULL);

	ListObjGetElements(listPtr, objc, objv);
	return TclNREvalObjv(interp, objc, objv, flags, NULL);
    }

    if (!(flags & TCL_EVAL_DIRECT)) {
	/*
	 * Let the compiler/engine subsystem do the evaluation.
	 *
	 * TIP #280 The invoker provides us with the context for the script.
	 * We transfer this to the byte code compiler.
	 */

	int allowExceptions = (iPtr->evalFlags & TCL_ALLOW_EXCEPTIONS);
	ByteCode *codePtr;
	CallFrame *savedVarFramePtr = NULL;	/* Saves old copy of
						 * iPtr->varFramePtr in case
						 * TCL_EVAL_GLOBAL was set. */

	if (flags & TCL_EVAL_GLOBAL) {
	    savedVarFramePtr = iPtr->varFramePtr;
	    iPtr->varFramePtr = iPtr->rootFramePtr;
	}
	Tcl_IncrRefCount(objPtr);
	codePtr = TclCompileObj(interp, objPtr, invoker, word);

	TclNRAddCallback(interp, TEOEx_ByteCodeCallback, savedVarFramePtr,
		    objPtr, INT2PTR(allowExceptions), NULL);
	TclNRAddCallback(interp, NRCallTEBC, INT2PTR(TCL_NR_BC_TYPE), codePtr,
		NULL, NULL);
	return TCL_OK;
    }

    {
	/*
	 * We're not supposed to use the compiler or byte-code
	 * interpreter. Let Tcl_EvalEx evaluate the command directly (and
	 * probably more slowly).
	 *
	 * TIP #280. Propagate context as much as we can. Especially if the
	 * script to evaluate is a single literal it makes sense to look if
	 * our context is one with absolute line numbers we can then track
	 * into the literal itself too.
	 *
	 * See also tclCompile.c, TclInitCompileEnv, for the equivalent code
	 * in the bytecode compiler.
	 */

	char *script;
	int numSrcBytes;

	Tcl_IncrRefCount(objPtr);
	if (invoker == NULL) {
	    /*
	     * No context, force opening of our own.
	     */

	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
	    result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
	} else {
	    /*
	     * We have an invoker, describing the command asking for the
	     * evaluation of a subordinate script. This script may originate
	     * in a literal word, or from a variable, etc. Using the line
	     * array we now check if we have good line information for the
	     * relevant word. The type of context is relevant as well. In a
	     * non-'source' context we don't have to try tracking lines.
	     *
	     * First see if the word exists and is a literal. If not we go
	     * through the easy dynamic branch. No need to perform more
	     * complex invokations.
	     */

	    int pc = 0;
	    CmdFrame *ctxPtr = TclStackAlloc(interp, sizeof(CmdFrame));

	    *ctxPtr = *invoker;
	    if (invoker->type == TCL_LOCATION_BC) {
		/*
		 * Note: Type BC => ctxPtr->data.eval.path is not used.
		 * ctxPtr->data.tebc.codePtr is used instead.
		 */

		TclGetSrcInfoForPc(ctxPtr);
		pc = 1;
	    }

	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);

	    if ((invoker->nline <= word) ||
		    (invoker->line[word] < 0) ||
		    (ctxPtr->type != TCL_LOCATION_SOURCE)) {
		/*
		 * Dynamic script, or dynamic context, force our own context.
		 */

		result = Tcl_EvalEx(interp, script, numSrcBytes, flags);
	    } else {
		/*
		 * Absolute context to reuse.
		 */

		iPtr->invokeCmdFramePtr = ctxPtr;
		iPtr->evalFlags |= TCL_EVAL_CTX;

		result = TclEvalEx(interp, script, numSrcBytes, flags,
			ctxPtr->line[word]);

		if (pc) {
		    /*
		     * Death of SrcInfo reference.
		     */

		    Tcl_DecrRefCount(ctxPtr->data.eval.path);
		}
	    }
	    TclStackFree(interp, ctxPtr);
	}
	TclDecrRefCount(objPtr);
	return result;
    }
}

static int
TEOEx_ByteCodeCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    CallFrame *savedVarFramePtr = data[0];
    Tcl_Obj *objPtr = data[1];
    int allowExceptions = PTR2INT(data[2]);

    if (iPtr->numLevels == 0) {
	if (result == TCL_RETURN) {
	    result = TclUpdateReturnInfo(iPtr);
	}
	if ((result != TCL_OK) && (result != TCL_ERROR) && !allowExceptions) {
	    char *script;
	    int numSrcBytes;

	    ProcessUnexpectedResult(interp, result);
	    result = TCL_ERROR;
	    script = Tcl_GetStringFromObj(objPtr, &numSrcBytes);
	    Tcl_LogCommandInfo(interp, script, script, numSrcBytes);
	}

	/*
	 * We are returning to level 0, so should call TclResetCancellation.
	 * Let us just unset the flags inline.
	 */

	iPtr->flags &= (~(CANCELED | TCL_CANCEL_UNWIND));
    }
    iPtr->evalFlags = 0;

    /*
     * Restore the callFrame if this was a TCL_EVAL_GLOBAL.
     */

    if (savedVarFramePtr) {
	iPtr->varFramePtr = savedVarFramePtr;
    }

    TclDecrRefCount(objPtr);
    return result;
}

static int
TEOEx_ListCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *objPtr = data[0];
    CmdFrame *eoFramePtr = data[1];
    Tcl_Obj *listPtr = data[2];

    /*
     * Remove the cmdFrame
     */

    if (eoFramePtr) {
	iPtr->cmdFramePtr = eoFramePtr->nextPtr;
	TclStackFree(interp, eoFramePtr);
    }
    TclDecrRefCount(objPtr);
    TclDecrRefCount(listPtr);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * ProcessUnexpectedResult --
 *
 *	Function called by Tcl_EvalObj to set the interpreter's result value
 *	to an appropriate error message when the code it evaluates returns an
 *	unexpected result code (not TCL_OK and not TCL_ERROR) to the topmost
 *	evaluation level.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The interpreter result is set to an error message appropriate to the
 *	result code.
 *
 *----------------------------------------------------------------------
 */

static void
ProcessUnexpectedResult(
    Tcl_Interp *interp,		/* The interpreter in which the unexpected
				 * result code was returned. */
    int returnCode)		/* The unexpected result code. */
{
    Tcl_ResetResult(interp);
    if (returnCode == TCL_BREAK) {
	Tcl_AppendResult(interp,
		"invoked \"break\" outside of a loop", NULL);
    } else if (returnCode == TCL_CONTINUE) {
	Tcl_AppendResult(interp,
		"invoked \"continue\" outside of a loop", NULL);
    } else {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"command returned bad code: %d", returnCode));
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean --
 *
 *	Functions to evaluate an expression and return its value in a
 *	particular form.
 *
 * Results:
 *	Each of the functions below returns a standard Tcl result. If an error
 *	occurs then an error message is left in the interp's result. Otherwise
 *	the value of the expression, in the appropriate form, is stored at
 *	*ptr. If the expression had a result that was incompatible with the
 *	desired form then an error is returned.
 *
 * Side effects:
 *	None.
 *
 *---------------------------------------------------------------------------
 */

int
Tcl_ExprLong(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    const char *exprstring,	/* Expression to evaluate. */
    long *ptr)			/* Where to store result. */
{
    register Tcl_Obj *exprPtr;
    int result = TCL_OK;
    if (*exprstring == '\0') {
	/*
	 * Legacy compatibility - return 0 for the zero-length string.
	 */

	*ptr = 0;
    } else {
	exprPtr = Tcl_NewStringObj(exprstring, -1);
	Tcl_IncrRefCount(exprPtr);
	result = Tcl_ExprLongObj(interp, exprPtr, ptr);
	Tcl_DecrRefCount(exprPtr);
	if (result != TCL_OK) {
	    (void) Tcl_GetStringResult(interp);
	}
    }
    return result;
}

int
Tcl_ExprDouble(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    const char *exprstring,	/* Expression to evaluate. */
    double *ptr)		/* Where to store result. */
{
    register Tcl_Obj *exprPtr;
    int result = TCL_OK;

    if (*exprstring == '\0') {
	/*
	 * Legacy compatibility - return 0 for the zero-length string.
	 */

	*ptr = 0.0;
    } else {
	exprPtr = Tcl_NewStringObj(exprstring, -1);
	Tcl_IncrRefCount(exprPtr);
	result = Tcl_ExprDoubleObj(interp, exprPtr, ptr);
	Tcl_DecrRefCount(exprPtr);
				/* Discard the expression object. */
	if (result != TCL_OK) {
	    (void) Tcl_GetStringResult(interp);
	}
    }
    return result;
}

int
Tcl_ExprBoolean(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    const char *exprstring,	/* Expression to evaluate. */
    int *ptr)			/* Where to store 0/1 result. */
{
    if (*exprstring == '\0') {
	/*
	 * An empty string. Just set the result boolean to 0 (false).
	 */

	*ptr = 0;
	return TCL_OK;
    } else {
	int result;
	Tcl_Obj *exprPtr = Tcl_NewStringObj(exprstring, -1);

	Tcl_IncrRefCount(exprPtr);
	result = Tcl_ExprBooleanObj(interp, exprPtr, ptr);
	Tcl_DecrRefCount(exprPtr);
	if (result != TCL_OK) {
	    /*
	     * Move the interpreter's object result to the string result, then
	     * reset the object result.
	     */

	    (void) Tcl_GetStringResult(interp);
	}
	return result;
    }
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj --
 *
 *	Functions to evaluate an expression in an object and return its value
 *	in a particular form.
 *
 * Results:
 *	Each of the functions below returns a standard Tcl result object. If
 *	an error occurs then an error message is left in the interpreter's
 *	result. Otherwise the value of the expression, in the appropriate
 *	form, is stored at *ptr. If the expression had a result that was
 *	incompatible with the desired form then an error is returned.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

int
Tcl_ExprLongObj(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    register Tcl_Obj *objPtr,	/* Expression to evaluate. */
    long *ptr)			/* Where to store long result. */
{
    Tcl_Obj *resultPtr;
    int result, type;
    double d;
    ClientData internalPtr;

    result = Tcl_ExprObj(interp, objPtr, &resultPtr);
    if (result != TCL_OK) {
	return TCL_ERROR;
    }

    if (TclGetNumberFromObj(interp, resultPtr, &internalPtr, &type)!=TCL_OK) {
	return TCL_ERROR;
    }

    switch (type) {
    case TCL_NUMBER_DOUBLE: {
	mp_int big;

	d = *((const double *) internalPtr);
	Tcl_DecrRefCount(resultPtr);
	if (Tcl_InitBignumFromDouble(interp, d, &big) != TCL_OK) {
	    return TCL_ERROR;
	}
	resultPtr = Tcl_NewBignumObj(&big);
	/* FALLTHROUGH */
    }
    case TCL_NUMBER_LONG:
    case TCL_NUMBER_WIDE:
    case TCL_NUMBER_BIG:
	result = TclGetLongFromObj(interp, resultPtr, ptr);
	break;

    case TCL_NUMBER_NAN:
	Tcl_GetDoubleFromObj(interp, resultPtr, &d);
	result = TCL_ERROR;
    }

    Tcl_DecrRefCount(resultPtr);/* Discard the result object. */
    return result;
}

int
Tcl_ExprDoubleObj(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    register Tcl_Obj *objPtr,	/* Expression to evaluate. */
    double *ptr)		/* Where to store double result. */
{
    Tcl_Obj *resultPtr;
    int result, type;
    ClientData internalPtr;

    result = Tcl_ExprObj(interp, objPtr, &resultPtr);
    if (result != TCL_OK) {
	return TCL_ERROR;
    }

    result = TclGetNumberFromObj(interp, resultPtr, &internalPtr, &type);
    if (result == TCL_OK) {
	switch (type) {
	case TCL_NUMBER_NAN:
#ifndef ACCEPT_NAN
	    result = Tcl_GetDoubleFromObj(interp, resultPtr, ptr);
	    break;
#endif
	case TCL_NUMBER_DOUBLE:
	    *ptr = *((const double *) internalPtr);
	    result = TCL_OK;
	    break;
	default:
	    result = Tcl_GetDoubleFromObj(interp, resultPtr, ptr);
	}
    }
    Tcl_DecrRefCount(resultPtr);/* Discard the result object. */
    return result;
}

int
Tcl_ExprBooleanObj(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    register Tcl_Obj *objPtr,	/* Expression to evaluate. */
    int *ptr)			/* Where to store 0/1 result. */
{
    Tcl_Obj *resultPtr;
    int result;

    result = Tcl_ExprObj(interp, objPtr, &resultPtr);
    if (result == TCL_OK) {
	result = Tcl_GetBooleanFromObj(interp, resultPtr, ptr);
	Tcl_DecrRefCount(resultPtr);
				/* Discard the result object. */
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclObjInvokeNamespace --
 *
 *	Object version: Invokes a Tcl command, given an objv/objc, from either
 *	the exposed or hidden set of commands in the given interpreter.
 *
 *	NOTE: The command is invoked in the global stack frame of the
 *	interpreter or namespace, thus it cannot see any current state on the
 *	stack of that interpreter.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	Whatever the command does.
 *
 *----------------------------------------------------------------------
 */

int
TclObjInvokeNamespace(
    Tcl_Interp *interp,		/* Interpreter in which command is to be
				 * invoked. */
    int objc,			/* Count of arguments. */
    Tcl_Obj *const objv[],	/* Argument objects; objv[0] points to the
				 * name of the command to invoke. */
    Tcl_Namespace *nsPtr,	/* The namespace to use. */
    int flags)			/* Combination of flags controlling the call:
				 * TCL_INVOKE_HIDDEN, TCL_INVOKE_NO_UNKNOWN,
				 * or TCL_INVOKE_NO_TRACEBACK. */
{
    int result;
    Tcl_CallFrame *framePtr;

    /*
     * Make the specified namespace the current namespace and invoke the
     * command.
     */

    result = TclPushStackFrame(interp, &framePtr, nsPtr, /*isProcFrame*/0);
    if (result != TCL_OK) {
	return TCL_ERROR;
    }

    result = TclObjInvoke(interp, objc, objv, flags);

    TclPopStackFrame(interp);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclObjInvoke --
 *
 *	Invokes a Tcl command, given an objv/objc, from either the exposed or
 *	the hidden sets of commands in the given interpreter.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	Whatever the command does.
 *
 *----------------------------------------------------------------------
 */

int
TclObjInvoke(
    Tcl_Interp *interp,		/* Interpreter in which command is to be
				 * invoked. */
    int objc,			/* Count of arguments. */
    Tcl_Obj *const objv[],	/* Argument objects; objv[0] points to the
				 * name of the command to invoke. */
    int flags)			/* Combination of flags controlling the call:
				 * TCL_INVOKE_HIDDEN, TCL_INVOKE_NO_UNKNOWN,
				 * or TCL_INVOKE_NO_TRACEBACK. */
{
    register Interp *iPtr = (Interp *) interp;
    Tcl_HashTable *hTblPtr;	/* Table of hidden commands. */
    char *cmdName;		/* Name of the command from objv[0]. */
    Tcl_HashEntry *hPtr = NULL;
    Command *cmdPtr;
    int result;

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

    if ((objc < 1) || (objv == NULL)) {
	Tcl_AppendResult(interp, "illegal argument vector", NULL);
	return TCL_ERROR;
    }

    if ((flags & TCL_INVOKE_HIDDEN) == 0) {
	Tcl_Panic("TclObjInvoke: called without TCL_INVOKE_HIDDEN");
    }

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

    cmdName = TclGetString(objv[0]);
    hTblPtr = iPtr->hiddenCmdTablePtr;
    if (hTblPtr != NULL) {
	hPtr = Tcl_FindHashEntry(hTblPtr, cmdName);
    }
    if (hPtr == NULL) {
	Tcl_AppendResult(interp, "invalid hidden command name \"",
		cmdName, "\"", NULL);
	return TCL_ERROR;
    }
    cmdPtr = Tcl_GetHashValue(hPtr);

    /*
     * Invoke the command function.
     */

    iPtr->cmdCount++;
    result = cmdPtr->objProc(cmdPtr->objClientData, interp, objc, objv);

    /*
     * If an error occurred, record information about what was being executed
     * when the error occurred.
     */

    if ((result == TCL_ERROR)
	    && ((flags & TCL_INVOKE_NO_TRACEBACK) == 0)
	    && ((iPtr->flags & ERR_ALREADY_LOGGED) == 0)) {
	int length;
	Tcl_Obj *command = Tcl_NewListObj(objc, objv);
	const char *cmdString;

	Tcl_IncrRefCount(command);
	cmdString = Tcl_GetStringFromObj(command, &length);
	Tcl_LogCommandInfo(interp, cmdString, cmdString, length);
	Tcl_DecrRefCount(command);
	iPtr->flags &= ~ERR_ALREADY_LOGGED;
    }
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_ExprString --
 *
 *	Evaluate an expression in a string and return its value in string
 *	form.
 *
 * Results:
 *	A standard Tcl result. If the result is TCL_OK, then the interp's
 *	result is set to the string value of the expression. If the result is
 *	TCL_ERROR, then the interp's result contains an error message.
 *
 * Side effects:
 *	A Tcl object is allocated to hold a copy of the expression string.
 *	This expression object is passed to Tcl_ExprObj and then deallocated.
 *
 *---------------------------------------------------------------------------
 */

int
Tcl_ExprString(
    Tcl_Interp *interp,		/* Context in which to evaluate the
				 * expression. */
    const char *expr)		/* Expression to evaluate. */
{
    int code = TCL_OK;

    if (expr[0] == '\0') {
	/*
	 * An empty string. Just set the interpreter's result to 0.
	 */

	Tcl_SetResult(interp, "0", TCL_VOLATILE);
    } else {
	Tcl_Obj *resultPtr, *exprObj = Tcl_NewStringObj(expr, -1);

	Tcl_IncrRefCount(exprObj);
	code = Tcl_ExprObj(interp, exprObj, &resultPtr);
	Tcl_DecrRefCount(exprObj);
	if (code == TCL_OK) {
	    Tcl_SetObjResult(interp, resultPtr);
	    Tcl_DecrRefCount(resultPtr);
	}

	/*
	 * Force the string rep of the interp result.
	 */

	(void) Tcl_GetStringResult(interp);
    }
    return code;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AppendObjToErrorInfo --
 *
 *	Add a Tcl_Obj value to the errorInfo field that describes the current
 *	error.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The value of the Tcl_obj is appended to the errorInfo field. If we are
 *	just starting to log an error, errorInfo is initialized from the error
 *	message in the interpreter's result.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AppendObjToErrorInfo(
    Tcl_Interp *interp,		/* Interpreter to which error information
				 * pertains. */
    Tcl_Obj *objPtr)		/* Message to record. */
{
    int length;
    const char *message = TclGetStringFromObj(objPtr, &length);

    Tcl_IncrRefCount(objPtr);
    Tcl_AddObjErrorInfo(interp, message, length);
    Tcl_DecrRefCount(objPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AddErrorInfo --
 *
 *	Add information to the errorInfo field that describes the current
 *	error.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The contents of message are appended to the errorInfo field. If we are
 *	just starting to log an error, errorInfo is initialized from the error
 *	message in the interpreter's result.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AddErrorInfo(
    Tcl_Interp *interp,		/* Interpreter to which error information
				 * pertains. */
    const char *message)	/* Message to record. */
{
    Tcl_AddObjErrorInfo(interp, message, -1);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AddObjErrorInfo --
 *
 *	Add information to the errorInfo field that describes the current
 *	error. This routine differs from Tcl_AddErrorInfo by taking a byte
 *	pointer and length.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	"length" bytes from "message" are appended to the errorInfo field. If
 *	"length" is negative, use bytes up to the first NULL byte. If we are
 *	just starting to log an error, errorInfo is initialized from the error
 *	message in the interpreter's result.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AddObjErrorInfo(
    Tcl_Interp *interp,		/* Interpreter to which error information
				 * pertains. */
    const char *message,	/* Points to the first byte of an array of
				 * bytes of the message. */
    int length)			/* The number of bytes in the message. If < 0,
				 * then append all bytes up to a NULL byte. */
{
    register Interp *iPtr = (Interp *) interp;

    /*
     * If we are just starting to log an error, errorInfo is initialized from
     * the error message in the interpreter's result.
     */

    iPtr->flags |= ERR_LEGACY_COPY;
    if (iPtr->errorInfo == NULL) {
	if (iPtr->result[0] != 0) {
	    /*
	     * The interp's string result is set, apparently by some extension
	     * making a deprecated direct write to it. That extension may
	     * expect interp->result to continue to be set, so we'll take
	     * special pains to avoid clearing it, until we drop support for
	     * interp->result completely.
	     */

	    iPtr->errorInfo = Tcl_NewStringObj(iPtr->result, -1);
	} else {
	    iPtr->errorInfo = iPtr->objResultPtr;
	}
	Tcl_IncrRefCount(iPtr->errorInfo);
	if (!iPtr->errorCode) {
	    Tcl_SetErrorCode(interp, "NONE", NULL);
	}
    }

    /*
     * Now append "message" to the end of errorInfo.
     */

    if (length != 0) {
	if (Tcl_IsShared(iPtr->errorInfo)) {
	    Tcl_DecrRefCount(iPtr->errorInfo);
	    iPtr->errorInfo = Tcl_DuplicateObj(iPtr->errorInfo);
	    Tcl_IncrRefCount(iPtr->errorInfo);
	}
	Tcl_AppendToObj(iPtr->errorInfo, message, length);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_VarEvalVA --
 *
 *	Given a variable number of string arguments, concatenate them all
 *	together and execute the result as a Tcl command.
 *
 * Results:
 *	A standard Tcl return result. An error message or other result may be
 *	left in the interp's result.
 *
 * Side effects:
 *	Depends on what was done by the command.
 *
 *---------------------------------------------------------------------------
 */

int
Tcl_VarEvalVA(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate command */
    va_list argList)		/* Variable argument list. */
{
    Tcl_DString buf;
    char *string;
    int result;

    /*
     * Copy the strings one after the other into a single larger string. Use
     * stack-allocated space for small commands, but if the command gets too
     * large than call ckalloc to create the space.
     */

    Tcl_DStringInit(&buf);
    while (1) {
	string = va_arg(argList, char *);
	if (string == NULL) {
	    break;
	}
	Tcl_DStringAppend(&buf, string, -1);
    }

    result = Tcl_Eval(interp, Tcl_DStringValue(&buf));
    Tcl_DStringFree(&buf);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_VarEval --
 *
 *	Given a variable number of string arguments, concatenate them all
 *	together and execute the result as a Tcl command.
 *
 * Results:
 *	A standard Tcl return result. An error message or other result may be
 *	left in interp->result.
 *
 * Side effects:
 *	Depends on what was done by the command.
 *
 *----------------------------------------------------------------------
 */
	/* ARGSUSED */
int
Tcl_VarEval(
    Tcl_Interp *interp,
    ...)
{
    va_list argList;
    int result;

    va_start(argList, interp);
    result = Tcl_VarEvalVA(interp, argList);
    va_end(argList);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GlobalEval --
 *
 *	Evaluate a command at global level in an interpreter.
 *
 * Results:
 *	A standard Tcl result is returned, and the interp's result is modified
 *	accordingly.
 *
 * Side effects:
 *	The command string is executed in interp, and the execution is carried
 *	out in the variable context of global level (no functions active),
 *	just as if an "uplevel #0" command were being executed.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_GlobalEval(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate command. */
    const char *command)	/* Command to evaluate. */
{
    register Interp *iPtr = (Interp *) interp;
    int result;
    CallFrame *savedVarFramePtr;

    savedVarFramePtr = iPtr->varFramePtr;
    iPtr->varFramePtr = iPtr->rootFramePtr;
    result = Tcl_Eval(interp, command);
    iPtr->varFramePtr = savedVarFramePtr;
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetRecursionLimit --
 *
 *	Set the maximum number of recursive calls that may be active for an
 *	interpreter at once.
 *
 * Results:
 *	The return value is the old limit on nesting for interp.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_SetRecursionLimit(
    Tcl_Interp *interp,		/* Interpreter whose nesting limit is to be
				 * set. */
    int depth)			/* New value for maximimum depth. */
{
    Interp *iPtr = (Interp *) interp;
    int old;

    old = iPtr->maxNestingDepth;
    if (depth > 0) {
	iPtr->maxNestingDepth = depth;
    }
    return old;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AllowExceptions --
 *
 *	Sets a flag in an interpreter so that exceptions can occur in the next
 *	call to Tcl_Eval without them being turned into errors.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The TCL_ALLOW_EXCEPTIONS flag gets set in the interpreter's evalFlags
 *	structure. See the reference documentation for more details.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AllowExceptions(
    Tcl_Interp *interp)		/* Interpreter in which to set flag. */
{
    Interp *iPtr = (Interp *) interp;

    iPtr->evalFlags |= TCL_ALLOW_EXCEPTIONS;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetVersion --
 *
 *	Get the Tcl major, minor, and patchlevel version numbers and the
 *	release type. A patch is a release type TCL_FINAL_RELEASE with a
 *	patchLevel > 0.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_GetVersion(
    int *majorV,
    int *minorV,
    int *patchLevelV,
    int *type)
{
    if (majorV != NULL) {
	*majorV = TCL_MAJOR_VERSION;
    }
    if (minorV != NULL) {
	*minorV = TCL_MINOR_VERSION;
    }
    if (patchLevelV != NULL) {
	*patchLevelV = TCL_RELEASE_SERIAL;
    }
    if (type != NULL) {
	*type = TCL_RELEASE_LEVEL;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Math Functions --
 *
 *	This page contains the functions that implement all of the built-in
 *	math functions for expressions.
 *
 * Results:
 *	Each function returns TCL_OK if it succeeds and pushes an Tcl object
 *	holding the result. If it fails it returns TCL_ERROR and leaves an
 *	error message in the interpreter's result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
ExprCeilFunc(
    ClientData clientData,	/* Ignored */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter list. */
{
    int code;
    double d;
    mp_int big;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[1], &d);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[1]->typePtr == &tclDoubleType)) {
	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }

    if (Tcl_GetBignumFromObj(NULL, objv[1], &big) == TCL_OK) {
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(TclCeil(&big)));
	mp_clear(&big);
    } else {
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(ceil(d)));
    }
    return TCL_OK;
}

static int
ExprFloorFunc(
    ClientData clientData,	/* Ignored */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter list. */
{
    int code;
    double d;
    mp_int big;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[1], &d);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[1]->typePtr == &tclDoubleType)) {
	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }

    if (Tcl_GetBignumFromObj(NULL, objv[1], &big) == TCL_OK) {
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(TclFloor(&big)));
	mp_clear(&big);
    } else {
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(floor(d)));
    }
    return TCL_OK;
}

static int
ExprIsqrtFunc(
    ClientData clientData,	/* Ignored */
    Tcl_Interp *interp,		/* The interpreter in which to execute. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter list. */
{
    ClientData ptr;
    int type;
    double d;
    Tcl_WideInt w;
    mp_int big;
    int exact = 0;		/* Flag ==1 if the argument can be represented
				 * in a double as an exact integer. */

    /*
     * Check syntax.
     */

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }

    /*
     * Make sure that the arg is a number.
     */

    if (TclGetNumberFromObj(interp, objv[1], &ptr, &type) != TCL_OK) {
	return TCL_ERROR;
    }

    switch (type) {
    case TCL_NUMBER_NAN:
	Tcl_GetDoubleFromObj(interp, objv[1], &d);
	return TCL_ERROR;
    case TCL_NUMBER_DOUBLE:
	d = *((const double *) ptr);
	if (d < 0) {
	    goto negarg;
	}
#ifdef IEEE_FLOATING_POINT
	if (d <= MAX_EXACT) {
	    exact = 1;
	}
#endif
	if (!exact) {
	    if (Tcl_InitBignumFromDouble(interp, d, &big) != TCL_OK) {
		return TCL_ERROR;
	    }
	}
	break;
    case TCL_NUMBER_BIG:
	if (Tcl_GetBignumFromObj(interp, objv[1], &big) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (SIGN(&big) == MP_NEG) {
	    mp_clear(&big);
	    goto negarg;
	}
	break;
    default:
	if (Tcl_GetWideIntFromObj(interp, objv[1], &w) != TCL_OK) {
	    return TCL_ERROR;
	}
	if (w < 0) {
	    goto negarg;
	}
	d = (double) w;
#ifdef IEEE_FLOATING_POINT
	if (d < MAX_EXACT) {
	    exact = 1;
	}
#endif
	if (!exact) {
	    Tcl_GetBignumFromObj(interp, objv[1], &big);
	}
	break;
    }

    if (exact) {
	Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt) sqrt(d)));
    } else {
	mp_int root;

	mp_init(&root);
	mp_sqrt(&big, &root);
	mp_clear(&big);
	Tcl_SetObjResult(interp, Tcl_NewBignumObj(&root));
    }
    return TCL_OK;

  negarg:
    Tcl_SetResult(interp, "square root of negative argument", TCL_STATIC);
    return TCL_ERROR;
}

static int
ExprSqrtFunc(
    ClientData clientData,	/* Ignored */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter list. */
{
    int code;
    double d;
    mp_int big;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[1], &d);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[1]->typePtr == &tclDoubleType)) {
	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }
    if ((d >= 0.0) && TclIsInfinite(d)
	    && (Tcl_GetBignumFromObj(NULL, objv[1], &big) == TCL_OK)) {
	mp_int root;

	mp_init(&root);
	mp_sqrt(&big, &root);
	mp_clear(&big);
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(TclBignumToDouble(&root)));
	mp_clear(&root);
    } else {
	Tcl_SetObjResult(interp, Tcl_NewDoubleObj(sqrt(d)));
    }
    return TCL_OK;
}

static int
ExprUnaryFunc(
    ClientData clientData,	/* Contains the address of a function that
				 * takes one double argument and returns a
				 * double result. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count */
    Tcl_Obj *const *objv)	/* Actual parameter list */
{
    int code;
    double d;
    double (*func)(double) = (double (*)(double)) clientData;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[1], &d);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[1]->typePtr == &tclDoubleType)) {
	d = objv[1]->internalRep.doubleValue;
	Tcl_ResetResult(interp);
	code = TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }
    errno = 0;
    return CheckDoubleResult(interp, func(d));
}

static int
CheckDoubleResult(
    Tcl_Interp *interp,
    double dResult)
{
#ifndef ACCEPT_NAN
    if (TclIsNaN(dResult)) {
	TclExprFloatError(interp, dResult);
	return TCL_ERROR;
    }
#endif
    if ((errno == ERANGE) && ((dResult == 0.0) || TclIsInfinite(dResult))) {
	/*
	 * When ERANGE signals under/overflow, just accept 0.0 or +/-Inf
	 */
    } else if (errno != 0) {
	/*
	 * Report other errno values as errors.
	 */

	TclExprFloatError(interp, dResult);
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, Tcl_NewDoubleObj(dResult));
    return TCL_OK;
}

static int
ExprBinaryFunc(
    ClientData clientData,	/* Contains the address of a function that
				 * takes two double arguments and returns a
				 * double result. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Parameter vector. */
{
    int code;
    double d1, d2;
    double (*func)(double, double) = (double (*)(double, double)) clientData;

    if (objc != 3) {
	MathFuncWrongNumArgs(interp, 3, objc, objv);
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[1], &d1);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[1]->typePtr == &tclDoubleType)) {
	d1 = objv[1]->internalRep.doubleValue;
	Tcl_ResetResult(interp);
	code = TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }
    code = Tcl_GetDoubleFromObj(interp, objv[2], &d2);
#ifdef ACCEPT_NAN
    if ((code != TCL_OK) && (objv[2]->typePtr == &tclDoubleType)) {
	d2 = objv[2]->internalRep.doubleValue;
	Tcl_ResetResult(interp);
	code = TCL_OK;
    }
#endif
    if (code != TCL_OK) {
	return TCL_ERROR;
    }
    errno = 0;
    return CheckDoubleResult(interp, func(d1, d2));
}

static int
ExprAbsFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Parameter vector. */
{
    ClientData ptr;
    int type;
    mp_int big;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }

    if (TclGetNumberFromObj(interp, objv[1], &ptr, &type) != TCL_OK) {
	return TCL_ERROR;
    }

    if (type == TCL_NUMBER_LONG) {
	long l = *((const long *) ptr);
	if (l <= (long)0) {
	    if (l == LONG_MIN) {
		TclBNInitBignumFromLong(&big, l);
		goto tooLarge;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewLongObj(-l));
	} else {
	    Tcl_SetObjResult(interp, objv[1]);
	}
	return TCL_OK;
    }

    if (type == TCL_NUMBER_DOUBLE) {
	double d = *((const double *) ptr);
	if (d <= 0.0) {
	    Tcl_SetObjResult(interp, Tcl_NewDoubleObj(-d));
	} else {
	    Tcl_SetObjResult(interp, objv[1]);
	}
	return TCL_OK;
    }

#ifndef NO_WIDE_TYPE
    if (type == TCL_NUMBER_WIDE) {
	Tcl_WideInt w = *((const Tcl_WideInt *) ptr);
	if (w < (Tcl_WideInt)0) {
	    if (w == LLONG_MIN) {
		TclBNInitBignumFromWideInt(&big, w);
		goto tooLarge;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewWideIntObj(-w));
	} else {
	    Tcl_SetObjResult(interp, objv[1]);
	}
	return TCL_OK;
    }
#endif

    if (type == TCL_NUMBER_BIG) {
	/* TODO: const correctness ? */
	if (mp_cmp_d((mp_int *) ptr, 0) == MP_LT) {
	    Tcl_GetBignumFromObj(NULL, objv[1], &big);
	tooLarge:
	    mp_neg(&big, &big);
	    Tcl_SetObjResult(interp, Tcl_NewBignumObj(&big));
	} else {
	    Tcl_SetObjResult(interp, objv[1]);
	}
	return TCL_OK;
    }

    if (type == TCL_NUMBER_NAN) {
#ifdef ACCEPT_NAN
	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
#else
	double d;
	Tcl_GetDoubleFromObj(interp, objv[1], &d);
	return TCL_ERROR;
#endif
    }
    return TCL_OK;
}

static int
ExprBoolFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    int value;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    if (Tcl_GetBooleanFromObj(interp, objv[1], &value) != TCL_OK) {
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(value));
    return TCL_OK;
}

static int
ExprDoubleFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    double dResult;
    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    if (Tcl_GetDoubleFromObj(interp, objv[1], &dResult) != TCL_OK) {
#ifdef ACCEPT_NAN
	if (objv[1]->typePtr == &tclDoubleType) {
	    Tcl_SetObjResult(interp, objv[1]);
	    return TCL_OK;
	}
#endif
	return TCL_ERROR;
    }
    Tcl_SetObjResult(interp, Tcl_NewDoubleObj(dResult));
    return TCL_OK;
}

static int
ExprEntierFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    double d;
    int type;
    ClientData ptr;

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }
    if (TclGetNumberFromObj(interp, objv[1], &ptr, &type) != TCL_OK) {
	return TCL_ERROR;
    }

    if (type == TCL_NUMBER_DOUBLE) {
	d = *((const double *) ptr);
	if ((d >= (double)LONG_MAX) || (d <= (double)LONG_MIN)) {
	    mp_int big;

	    if (Tcl_InitBignumFromDouble(interp, d, &big) != TCL_OK) {
		/* Infinity */
		return TCL_ERROR;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewBignumObj(&big));
	    return TCL_OK;
	} else {
	    long result = (long) d;

	    Tcl_SetObjResult(interp, Tcl_NewLongObj(result));
	    return TCL_OK;
	}
    }

    if (type != TCL_NUMBER_NAN) {
	/*
	 * All integers are already of integer type.
	 */

	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }

    /*
     * Get the error message for NaN.
     */

    Tcl_GetDoubleFromObj(interp, objv[1], &d);
    return TCL_ERROR;
}

static int
ExprIntFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    long iResult;
    Tcl_Obj *objPtr;
    if (ExprEntierFunc(NULL, interp, objc, objv) != TCL_OK) {
	return TCL_ERROR;
    }
    objPtr = Tcl_GetObjResult(interp);
    if (TclGetLongFromObj(NULL, objPtr, &iResult) != TCL_OK) {
	/*
	 * Truncate the bignum; keep only bits in long range.
	 */

	mp_int big;

	Tcl_GetBignumFromObj(NULL, objPtr, &big);
	mp_mod_2d(&big, (int) CHAR_BIT * sizeof(long), &big);
	objPtr = Tcl_NewBignumObj(&big);
	Tcl_IncrRefCount(objPtr);
	TclGetLongFromObj(NULL, objPtr, &iResult);
	Tcl_DecrRefCount(objPtr);
    }
    Tcl_SetObjResult(interp, Tcl_NewLongObj(iResult));
    return TCL_OK;
}

static int
ExprWideFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    Tcl_WideInt wResult;
    Tcl_Obj *objPtr;
    if (ExprEntierFunc(NULL, interp, objc, objv) != TCL_OK) {
	return TCL_ERROR;
    }
    objPtr = Tcl_GetObjResult(interp);
    if (Tcl_GetWideIntFromObj(NULL, objPtr, &wResult) != TCL_OK) {
	/*
	 * Truncate the bignum; keep only bits in wide int range.
	 */

	mp_int big;

	Tcl_GetBignumFromObj(NULL, objPtr, &big);
	mp_mod_2d(&big, (int) CHAR_BIT * sizeof(Tcl_WideInt), &big);
	objPtr = Tcl_NewBignumObj(&big);
	Tcl_IncrRefCount(objPtr);
	Tcl_GetWideIntFromObj(NULL, objPtr, &wResult);
	Tcl_DecrRefCount(objPtr);
    }
    Tcl_SetObjResult(interp, Tcl_NewWideIntObj(wResult));
    return TCL_OK;
}

static int
ExprRandFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    Interp *iPtr = (Interp *) interp;
    double dResult;
    long tmp;			/* Algorithm assumes at least 32 bits. Only
				 * long guarantees that. See below. */
    Tcl_Obj *oResult;

    if (objc != 1) {
	MathFuncWrongNumArgs(interp, 1, objc, objv);
	return TCL_ERROR;
    }

    if (!(iPtr->flags & RAND_SEED_INITIALIZED)) {
	iPtr->flags |= RAND_SEED_INITIALIZED;

	/*
	 * Take into consideration the thread this interp is running in order
	 * to insure different seeds in different threads (bug #416643)
	 */

	iPtr->randSeed = TclpGetClicks() + ((long)Tcl_GetCurrentThread()<<12);

	/*
	 * Make sure 1 <= randSeed <= (2^31) - 2. See below.
	 */

	iPtr->randSeed &= (unsigned long) 0x7fffffff;
	if ((iPtr->randSeed == 0) || (iPtr->randSeed == 0x7fffffff)) {
	    iPtr->randSeed ^= 123459876;
	}
    }

    /*
     * Generate the random number using the linear congruential generator
     * defined by the following recurrence:
     *		seed = ( IA * seed ) mod IM
     * where IA is 16807 and IM is (2^31) - 1. The recurrence maps a seed in
     * the range [1, IM - 1] to a new seed in that same range. The recurrence
     * maps IM to 0, and maps 0 back to 0, so those two values must not be
     * allowed as initial values of seed.
     *
     * In order to avoid potential problems with integer overflow, the
     * recurrence is implemented in terms of additional constants IQ and IR
     * such that
     *		IM = IA*IQ + IR
     * None of the operations in the implementation overflows a 32-bit signed
     * integer, and the C type long is guaranteed to be at least 32 bits wide.
     *
     * For more details on how this algorithm works, refer to the following
     * papers:
     *
     *	S.K. Park & K.W. Miller, "Random number generators: good ones are hard
     *	to find," Comm ACM 31(10):1192-1201, Oct 1988
     *
     *	W.H. Press & S.A. Teukolsky, "Portable random number generators,"
     *	Computers in Physics 6(5):522-524, Sep/Oct 1992.
     */

#define RAND_IA		16807
#define RAND_IM		2147483647
#define RAND_IQ		127773
#define RAND_IR		2836
#define RAND_MASK	123459876

    tmp = iPtr->randSeed/RAND_IQ;
    iPtr->randSeed = RAND_IA*(iPtr->randSeed - tmp*RAND_IQ) - RAND_IR*tmp;
    if (iPtr->randSeed < 0) {
	iPtr->randSeed += RAND_IM;
    }

    /*
     * Since the recurrence keeps seed values in the range [1, RAND_IM - 1],
     * dividing by RAND_IM yields a double in the range (0, 1).
     */

    dResult = iPtr->randSeed * (1.0/RAND_IM);

    /*
     * Push a Tcl object with the result.
     */

    TclNewDoubleObj(oResult, dResult);
    Tcl_SetObjResult(interp, oResult);
    return TCL_OK;
}

static int
ExprRoundFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Parameter vector. */
{
    double d;
    ClientData ptr;
    int type;

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

    if (TclGetNumberFromObj(interp, objv[1], &ptr, &type) != TCL_OK) {
	return TCL_ERROR;
    }

    if (type == TCL_NUMBER_DOUBLE) {
	double fractPart, intPart;
	long max = LONG_MAX, min = LONG_MIN;

	fractPart = modf(*((const double *) ptr), &intPart);
	if (fractPart <= -0.5) {
	    min++;
	} else if (fractPart >= 0.5) {
	    max--;
	}
	if ((intPart >= (double)max) || (intPart <= (double)min)) {
	    mp_int big;

	    if (Tcl_InitBignumFromDouble(interp, intPart, &big) != TCL_OK) {
		/* Infinity */
		return TCL_ERROR;
	    }
	    if (fractPart <= -0.5) {
		mp_sub_d(&big, 1, &big);
	    } else if (fractPart >= 0.5) {
		mp_add_d(&big, 1, &big);
	    }
	    Tcl_SetObjResult(interp, Tcl_NewBignumObj(&big));
	    return TCL_OK;
	} else {
	    long result = (long)intPart;

	    if (fractPart <= -0.5) {
		result--;
	    } else if (fractPart >= 0.5) {
		result++;
	    }
	    Tcl_SetObjResult(interp, Tcl_NewLongObj(result));
	    return TCL_OK;
	}
    }

    if (type != TCL_NUMBER_NAN) {
	/*
	 * All integers are already rounded
	 */

	Tcl_SetObjResult(interp, objv[1]);
	return TCL_OK;
    }

    /*
     * Get the error message for NaN.
     */

    Tcl_GetDoubleFromObj(interp, objv[1], &d);
    return TCL_ERROR;
}

static int
ExprSrandFunc(
    ClientData clientData,	/* Ignored. */
    Tcl_Interp *interp,		/* The interpreter in which to execute the
				 * function. */
    int objc,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Parameter vector. */
{
    Interp *iPtr = (Interp *) interp;
    long i = 0;			/* Initialized to avoid compiler warning. */

    /*
     * Convert argument and use it to reset the seed.
     */

    if (objc != 2) {
	MathFuncWrongNumArgs(interp, 2, objc, objv);
	return TCL_ERROR;
    }

    if (TclGetLongFromObj(NULL, objv[1], &i) != TCL_OK) {
	Tcl_Obj *objPtr;
	mp_int big;

	if (Tcl_GetBignumFromObj(interp, objv[1], &big) != TCL_OK) {
	    /* TODO: more ::errorInfo here? or in caller? */
	    return TCL_ERROR;
	}

	mp_mod_2d(&big, (int) CHAR_BIT * sizeof(long), &big);
	objPtr = Tcl_NewBignumObj(&big);
	Tcl_IncrRefCount(objPtr);
	TclGetLongFromObj(NULL, objPtr, &i);
	Tcl_DecrRefCount(objPtr);
    }

    /*
     * Reset the seed. Make sure 1 <= randSeed <= 2^31 - 2. See comments in
     * ExprRandFunc() for more details.
     */

    iPtr->flags |= RAND_SEED_INITIALIZED;
    iPtr->randSeed = i;
    iPtr->randSeed &= (unsigned long) 0x7fffffff;
    if ((iPtr->randSeed == 0) || (iPtr->randSeed == 0x7fffffff)) {
	iPtr->randSeed ^= 123459876;
    }

    /*
     * To avoid duplicating the random number generation code we simply clean
     * up our state and call the real random number function. That function
     * will always succeed.
     */

    return ExprRandFunc(clientData, interp, 1, objv);
}

/*
 *----------------------------------------------------------------------
 *
 * MathFuncWrongNumArgs --
 *
 *	Generate an error message when a math function presents the wrong
 *	number of arguments.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	An error message is stored in the interpreter result.
 *
 *----------------------------------------------------------------------
 */

static void
MathFuncWrongNumArgs(
    Tcl_Interp *interp,		/* Tcl interpreter */
    int expected,		/* Formal parameter count. */
    int found,			/* Actual parameter count. */
    Tcl_Obj *const *objv)	/* Actual parameter vector. */
{
    const char *name = Tcl_GetString(objv[0]);
    const char *tail = name + strlen(name);

    while (tail > name+1) {
	--tail;
	if (*tail == ':' && tail[-1] == ':') {
	    name = tail+1;
	    break;
	}
    }
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "too %s arguments for math function \"%s\"",
	    (found < expected ? "few" : "many"), name));
}

#ifdef USE_DTRACE
/*
 *----------------------------------------------------------------------
 *
 * DTraceObjCmd --
 *
 *	This function is invoked to process the "::tcl::dtrace" Tcl command.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	The 'tcl-probe' DTrace probe is triggered (if it is enabled).
 *
 *----------------------------------------------------------------------
 */

static int
DTraceObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    if (TCL_DTRACE_TCL_PROBE_ENABLED()) {
	char *a[10];
	int i = 0;

	while (i++ < 10) {
	    a[i-1] = i < objc ? TclGetString(objv[i]) : NULL;
	}
	TCL_DTRACE_TCL_PROBE(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclDTraceInfo --
 *
 *	Extract information from a TIP280 dict for use by DTrace probes.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclDTraceInfo(
    Tcl_Obj *info,
    const char **args,
    int *argsi)
{
    static Tcl_Obj *keys[10] = { NULL };
    Tcl_Obj **k = keys, *val;
    int i = 0;

    if (!*k) {
#define kini(s) TclNewLiteralStringObj(keys[i], s); i++
	kini("cmd");	kini("type");	kini("proc");	kini("file");
	kini("method");	kini("class");	kini("lambda");	kini("object");
	kini("line");	kini("level");
#undef kini
    }
    for (i = 0; i < 6; i++) {
	Tcl_DictObjGet(NULL, info, *k++, &val);
	args[i] = val ? TclGetString(val) : NULL;
    }
    /* no "proc" -> use "lambda" */
    if (!args[2]) {
	Tcl_DictObjGet(NULL, info, *k, &val);
	args[2] = val ? TclGetString(val) : NULL;
    }
    k++;
    /* no "class" -> use "object" */
    if (!args[5]) {
	Tcl_DictObjGet(NULL, info, *k, &val);
	args[5] = val ? TclGetString(val) : NULL;
    }
    k++;
    for (i = 0; i < 2; i++) {
	Tcl_DictObjGet(NULL, info, *k++, &val);
	if (val) {
	    TclGetIntFromObj(NULL, val, &(argsi[i]));
	} else {
	    argsi[i] = 0;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DTraceCmdReturn --
 *
 *	NR callback for DTrace command return probes.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
DTraceCmdReturn(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    char *cmdName = TclGetString((Tcl_Obj *) data[0]);

    if (TCL_DTRACE_CMD_RETURN_ENABLED()) {
	TCL_DTRACE_CMD_RETURN(cmdName, result);
    }
    if (TCL_DTRACE_CMD_RESULT_ENABLED()) {
	Tcl_Obj *r = Tcl_GetObjResult(interp);

	TCL_DTRACE_CMD_RESULT(cmdName, result, TclGetString(r), r);
    }
    return result;
}

TCL_DTRACE_DEBUG_LOG();

#endif /* USE_DTRACE */

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NRCallObjProc --
 *
 *	This function calls an objProc directly while managing things properly
 *	if it happens to be an NR objProc. It is meant to be used by extenders
 *	that provide an NR implementation of a command, as this function
 *	permits a trivial coding of the non-NR objProc.
 *
 * Results:
 *	The return value is a standard Tcl completion code such as TCL_OK or
 *	TCL_ERROR. A result or error message is left in interp's result.
 *
 * Side effects:
 *	Depends on the objProc.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_NRCallObjProc(
    Tcl_Interp *interp,
    Tcl_ObjCmdProc *objProc,
    ClientData clientData,
    int objc,
    Tcl_Obj *const objv[])
{
    int result = TCL_OK;
    TEOV_callback *rootPtr = TOP_CB(interp);

    if (TCL_DTRACE_CMD_ARGS_ENABLED()) {
	char *a[10];
	int i = 0;

	while (i < 10) {
	    a[i] = i < objc ? TclGetString(objv[i]) : NULL; i++;
	}
	TCL_DTRACE_CMD_ARGS(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
		a[8], a[9]);
    }
    if (TCL_DTRACE_CMD_INFO_ENABLED() && ((Interp *) interp)->cmdFramePtr) {
	Tcl_Obj *info = TclInfoFrame(interp, ((Interp *) interp)->cmdFramePtr);
	const char *a[6]; int i[2];

	TclDTraceInfo(info, a, i);
	TCL_DTRACE_CMD_INFO(a[0], a[1], a[2], a[3], i[0], i[1], a[4], a[5]);
	TclDecrRefCount(info);
    }
    if ((TCL_DTRACE_CMD_RETURN_ENABLED() || TCL_DTRACE_CMD_RESULT_ENABLED())
	    && objc) {
	TclNRAddCallback(interp, DTraceCmdReturn, objv[0], NULL, NULL, NULL);
    }
    if (TCL_DTRACE_CMD_ENTRY_ENABLED() && objc) {
	TCL_DTRACE_CMD_ENTRY(TclGetString(objv[0]), objc - 1,
		(Tcl_Obj **)(objv + 1));
    }
    result = objProc(clientData, interp, objc, objv);
    return TclNRRunCallbacks(interp, result, rootPtr, 0);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NRCreateCommand --
 *
 *	Define a new NRE-enabled object-based command in a command table.
 *
 * Results:
 *	The return value is a token for the command, which can be used in
 *	future calls to Tcl_GetCommandName.
 *
 * Side effects:
 *	If no command named "cmdName" already exists for interp, one is
 *	created. Otherwise, if a command does exist, then if the object-based
 *	Tcl_ObjCmdProc is TclInvokeStringCommand, we assume Tcl_CreateCommand
 *	was called previously for the same command and just set its
 *	Tcl_ObjCmdProc to the argument "proc"; otherwise, we delete the old
 *	command.
 *
 *	In the future, during bytecode evaluation when "cmdName" is seen as
 *	the name of a command by Tcl_EvalObj or Tcl_Eval, the object-based
 *	Tcl_ObjCmdProc proc will be called. When the command is deleted from
 *	the table, deleteProc will be called. See the manual entry for details
 *	on the calling sequence.
 *
 *----------------------------------------------------------------------
 */

Tcl_Command
Tcl_NRCreateCommand(
    Tcl_Interp *interp,		/* Token for command interpreter (returned by
				 * previous call to Tcl_CreateInterp). */
    const char *cmdName,	/* Name of command. If it contains namespace
				 * qualifiers, the new command is put in the
				 * specified namespace; otherwise it is put in
				 * the global namespace. */
    Tcl_ObjCmdProc *proc,	/* Object-based function to associate with
				 * name, provides direct access for direct
				 * calls. */
    Tcl_ObjCmdProc *nreProc,	/* Object-based function to associate with
				 * name, provides NR implementation */
    ClientData clientData,	/* Arbitrary value to pass to object
				 * function. */
    Tcl_CmdDeleteProc *deleteProc)
				/* If not NULL, gives a function to call when
				 * this command is deleted. */
{
    Command *cmdPtr = (Command *)
	    Tcl_CreateObjCommand(interp,cmdName,proc,clientData,deleteProc);

    cmdPtr->nreProc = nreProc;
    return (Tcl_Command) cmdPtr;
}

/****************************************************************************
 * Stuff for the public api
 ****************************************************************************/

int
Tcl_NREvalObj(
    Tcl_Interp *interp,
    Tcl_Obj *objPtr,
    int flags)
{
    return TclNREvalObjEx(interp, objPtr, flags, NULL, INT_MIN);
}

int
Tcl_NREvalObjv(
    Tcl_Interp *interp,		/* Interpreter in which to evaluate the
				 * command. Also used for error reporting. */
    int objc,			/* Number of words in command. */
    Tcl_Obj *const objv[],	/* An array of pointers to objects that are
				 * the words that make up the command. */
    int flags)			/* Collection of OR-ed bits that control the
				 * evaluation of the script. Only
				 * TCL_EVAL_GLOBAL, TCL_EVAL_INVOKE and
				 * TCL_EVAL_NOERR are currently supported. */
{
    return TclNREvalObjv(interp, objc, objv, flags, NULL);
}

int
Tcl_NRCmdSwap(
    Tcl_Interp *interp,
    Tcl_Command cmd,
    int objc,
    Tcl_Obj *const objv[],
    int flags)
{
    return TclNREvalObjv(interp, objc, objv, flags, (Command *) cmd);
}

/*****************************************************************************
 * Stuff for tailcalls
 *****************************************************************************
 *
 * Just to show that IT CAN BE DONE! The precise semantics are not simple,
 * require more thought. Possibly need a new Tcl return code to do it right?
 * Questions include:
 *   (1) How is the objc/objv tailcall to be run? My current thinking is that
 *	 it should essentially be
 *	     [tailcall a b c] <=> [uplevel 1 [list a b c]]
 *	 with two caveats
 *	     (a) the current frame is dropped first, after running all pending
 *		 cleanup tasks and saving its namespace
 *	     (b) 'a' is looked up in the returning frame's namespace, but the
 *		 command is run in the context to which we are returning
 *	 Current implementation does this if [tailcall] is called from within
 *	 a proc, errors otherwise.
 *   (2) Should a tailcall bypass [catch] in the returning frame? Current
 *	 implementation does not (or does it? Changed, test!) - it causes an
 *	 error.
 *
 * FIXME NRE!
 */

int
TclNRAtProcExitObjCmd(
    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *listPtr;
    Namespace *nsPtr = iPtr->varFramePtr->nsPtr;

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "command ?arg ...?");
	return TCL_ERROR;
    }

    if (!iPtr->varFramePtr->isProcCallFrame ||	      /* is not a body ... */
	    (iPtr->framePtr != iPtr->varFramePtr)) {  /* or is upleveled   */
	Tcl_SetResult(interp,
		"atProcExit/tailcall can only be called from a proc or lambda",
		TCL_STATIC);
	return TCL_ERROR;
    }

    nsPtr->activationCount++;
    listPtr = Tcl_NewListObj(objc-1, objv+1);
    Tcl_IncrRefCount(listPtr);

    /*
     * Add two callbacks: first the one to actually evaluate the tailcalled
     * command, then the one that signals TEBC to stash the first at its
     * proper place.
     */

    TclNRAddCallback(interp, NRAtProcExitEval, listPtr, nsPtr, NULL, NULL);
    TclNRAddCallback(interp, NRCallTEBC, clientData, NULL, NULL, NULL);
    return TCL_OK;
}

int
NRAtProcExitEval(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Obj *listPtr = data[0];
    Namespace *nsPtr = data[1];
    int objc;
    Tcl_Obj **objv;

    TclNRAddCallback(interp, AtProcExitCleanup, listPtr, NULL, NULL, NULL);
    if (result == TCL_OK) {
	iPtr->lookupNsPtr = nsPtr;
	ListObjGetElements(listPtr, objc, objv);
	result = TclNREvalObjv(interp, objc, objv, 0, NULL);
    }

    nsPtr->activationCount--;
    if ((nsPtr->flags & NS_DYING)
	    && (nsPtr->activationCount - (nsPtr == iPtr->globalNsPtr) == 0)) {
	/*
	 * FIXME NRE tailcall: is this the proper way to manage this? This is
	 * like what CallFrames do.
	 */

	Tcl_DeleteNamespace((Tcl_Namespace *) nsPtr);
    }
    return result;
}

static int
AtProcExitCleanup(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    Tcl_DecrRefCount((Tcl_Obj *) data[0]);
    return result;
}

void
Tcl_NRAddCallback(
    Tcl_Interp *interp,
    Tcl_NRPostProc *postProcPtr,
    ClientData data0,
    ClientData data1,
    ClientData data2,
    ClientData data3)
{
    if (!(postProcPtr)) {
	Tcl_Panic("Adding a callback without an objProc?!");
    }
    TclNRAddCallback(interp, postProcPtr, data0, data1, data2, data3);
}

/*
 *----------------------------------------------------------------------
 *
 * TclNRCoroutineObjCmd -- (and friends)
 *
 *	This object-based function is invoked to process the "coroutine" Tcl
 *	command. It is heavily based on "apply".
 *
 * Results:
 *	A standard Tcl object result value.
 *
 * Side effects:
 *	A new procedure gets created.
 *
 * ** FIRST EXPERIMENTAL IMPLEMENTATION **
 *
 * It is fairly amateurish and not up to our standards - mainly in terms of
 * error messages and [info] interaction. Just to test the infrastructure in
 * teov and tebc.
 *----------------------------------------------------------------------
 */

static int		NRInterpCoroutine(ClientData clientData,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		RewindCoroutine(CoroutineData *corPtr, int result);
static void		DeleteCoroutine(ClientData clientData);
static void		PlugCoroutineChains(CoroutineData *corPtr);

static int		NRCoroutineFirstCallback(ClientData data[],
			    Tcl_Interp *interp, int result);
static int		NRCoroutineExitCallback(ClientData data[],
			    Tcl_Interp *interp, int result);
static int		NRCoroutineCallerCallback(ClientData data[],
			    Tcl_Interp *interp, int result);

static const CorContext NULL_CONTEXT = {NULL, NULL, NULL};

#define SAVE_CONTEXT(context)				\
    (context).framePtr = iPtr->framePtr;		\
    (context).varFramePtr = iPtr->varFramePtr;		\
    (context).cmdFramePtr = iPtr->cmdFramePtr

#define RESTORE_CONTEXT(context)			\
    iPtr->framePtr = (context).framePtr;		\
    iPtr->varFramePtr = (context).varFramePtr;		\
    iPtr->cmdFramePtr = (context).cmdFramePtr

#define iPtr ((Interp *) interp)

int
TclNRYieldObjCmd(
    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;
    int numLevels = iPtr->numLevels;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?returnValue?");
	return TCL_ERROR;
    }

    if (!corPtr) {
	Tcl_SetResult(interp, "yield can only be called in a coroutine",
		TCL_STATIC);
	return TCL_ERROR;
    }

    if (objc == 2) {
	Tcl_SetObjResult(interp, objv[1]);
    }

    iPtr->numLevels = corPtr->auxNumLevels;
    corPtr->auxNumLevels = numLevels - corPtr->auxNumLevels;

    TclNRAddCallback(interp, NRCallTEBC, INT2PTR(TCL_NR_YIELD_TYPE),
	    NULL, NULL, NULL);
    return TCL_OK;
}

static int
RewindCoroutine(
    CoroutineData *corPtr,
    int result)
{
    Tcl_Obj *objPtr;
    Tcl_Interp *interp = corPtr->eePtr->interp;
    Tcl_InterpState state = Tcl_SaveInterpState(interp, result);

    NRE_ASSERT(COR_IS_SUSPENDED(corPtr));
    NRE_ASSERT(corPtr->eePtr != NULL);
    NRE_ASSERT(corPtr->eePtr->bottomPtr != NULL);
    NRE_ASSERT(corPtr->eePtr != iPtr->execEnvPtr);

    TclNewObj(objPtr);
    Tcl_IncrRefCount(objPtr);

    corPtr->eePtr->rewind = 1;
    result = NRInterpCoroutine(corPtr, interp, 1, &objPtr);

    NRE_ASSERT(iPtr->execEnvPtr == corPtr->eePtr);

    Tcl_DecrRefCount(objPtr);
    result = Tcl_RestoreInterpState(interp, state);
    return result;
}

static void
DeleteCoroutine(
    ClientData clientData)
{
    CoroutineData *corPtr = clientData;
    Tcl_Interp *interp = corPtr->eePtr->interp;
    TEOV_callback *rootPtr = TOP_CB(interp);

    if (COR_IS_SUSPENDED(corPtr)) {
	TclNRRunCallbacks(interp, RewindCoroutine(corPtr,TCL_OK), rootPtr, 0);
    }
}

static void
PlugCoroutineChains(
    CoroutineData *corPtr)
{
    /*
     * Called to plug the coroutine's running environment into the caller's,
     * so that the frame chains are uninterrupted. Note that the levels and
     * numlevels may be wrong - we should fix them for the whole chain and not
     * just the base! This probably breaks Tip 280 and should be fixed, or at
     * least rethought as some of 280's functionality makes doubtful sense in
     * presence of coroutines (maybe the cmdFrame should be attached to the
     * execEnv and not the interp?)
     */

    corPtr->base.framePtr->callerPtr = corPtr->caller.framePtr;
    corPtr->base.framePtr->callerVarPtr = corPtr->caller.varFramePtr;

    corPtr->base.cmdFramePtr->nextPtr = corPtr->caller.cmdFramePtr;
}

static int
NRCoroutineFirstCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    CoroutineData *corPtr = data[0];
    register CmdFrame *tmpPtr = iPtr->cmdFramePtr;

    if (corPtr->eePtr) {
	while (tmpPtr->nextPtr != corPtr->caller.cmdFramePtr) {
	    tmpPtr = tmpPtr->nextPtr;
	}

	corPtr->base.cmdFramePtr = tmpPtr;
    }

    return result;
}

static int
NRCoroutineCallerCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    CoroutineData *corPtr = data[0];
    Command *cmdPtr = corPtr->cmdPtr;

    /*
     * This is the last callback in the caller execEnv, right before switching
     * to the coroutine's
     */

    NRE_ASSERT(iPtr->execEnvPtr == corPtr->callerEEPtr);

    if (!corPtr->eePtr) {
	/*
	 * The execEnv was wound down but not deleted for our sake. We finish
	 * the job here. The caller context has already been restored.
	 */

	NRE_ASSERT(iPtr->varFramePtr == corPtr->caller.varFramePtr);
	NRE_ASSERT(iPtr->framePtr == corPtr->caller.framePtr);
	NRE_ASSERT(iPtr->cmdFramePtr == corPtr->caller.cmdFramePtr);
	ckfree((char *) corPtr);
	return result;
    }

    NRE_ASSERT(COR_IS_SUSPENDED(corPtr));
    SAVE_CONTEXT(corPtr->running);
    RESTORE_CONTEXT(corPtr->caller);

    if (cmdPtr->flags & CMD_IS_DELETED) {
	/*
	 * The command was deleted while it was running: wind down the execEnv,
	 * this will do the complete cleanup. RewindCoroutine will restore both
	 * the caller's context and interp state.
	 */

	return RewindCoroutine(corPtr, result);
    }

    return result;
}

static int
NRCoroutineExitCallback(
    ClientData data[],
    Tcl_Interp *interp,
    int result)
{
    CoroutineData *corPtr = data[0];
    Command *cmdPtr = corPtr->cmdPtr;

    /*
     * This runs at the bottom of the Coroutine's execEnv: it will be executed
     * when the coroutine returns or is wound down, but not when it yields. It
     * deletes the coroutine and restores the caller's environment.
     */

    NRE_ASSERT(interp == corPtr->eePtr->interp);
    NRE_ASSERT(TOP_CB(interp) == NULL);
    NRE_ASSERT(iPtr->execEnvPtr == corPtr->eePtr);
    NRE_ASSERT(!COR_IS_SUSPENDED(corPtr));
    NRE_ASSERT((corPtr->callerEEPtr->callbackPtr->procPtr == NRCoroutineCallerCallback)
	    || ((corPtr->callerEEPtr->callbackPtr->procPtr == NRCoroutineFirstCallback) &&
		    (corPtr->callerEEPtr->callbackPtr->nextPtr->procPtr == NRCoroutineCallerCallback)));

    NRE_ASSERT(iPtr->framePtr->compiledLocals == NULL);
    TclPopStackFrame(interp);

    cmdPtr->deleteProc = NULL;
    Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
    TclCleanupCommandMacro(cmdPtr);

    corPtr->eePtr->corPtr = NULL;
    TclDeleteExecEnv(corPtr->eePtr);
    corPtr->eePtr = NULL;

    /* RESTORE_CONTEXT(corPtr->caller); AUTOMATIC! */

    NRE_ASSERT(iPtr->framePtr == corPtr->caller.framePtr);
    NRE_ASSERT(iPtr->cmdFramePtr == corPtr->caller.cmdFramePtr);
    iPtr->varFramePtr = corPtr->caller.varFramePtr;

    iPtr->execEnvPtr = corPtr->callerEEPtr;

    return result;
}

static int
NRInterpCoroutine(
    ClientData clientData,
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    CoroutineData *corPtr = clientData;
    int nestNumLevels = corPtr->auxNumLevels;

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

    if (!COR_IS_SUSPENDED(corPtr)) {
	Tcl_ResetResult(interp);
	Tcl_AppendResult(interp, "coroutine \"", Tcl_GetString(objv[0]),
		"\" is already running", NULL);
	Tcl_SetErrorCode(interp, "COROUTINE_BUSY", NULL);
	return TCL_ERROR;
    }

    /*
     * Swap the interp's environment to make it suitable to run this coroutine.
     * TEBC needs no info to resume executing after a suspension: the codePtr
     * will be read from the execEnv's saved bottomPtr.
     */

    if (objc == 2) {
	Tcl_SetObjResult(interp, objv[1]);
    }

    SAVE_CONTEXT(corPtr->caller);
    RESTORE_CONTEXT(corPtr->running);
    PlugCoroutineChains(corPtr);
    corPtr->auxNumLevels = iPtr->numLevels;
    iPtr->numLevels += nestNumLevels;

    TclNRAddCallback(interp, NRCoroutineCallerCallback, corPtr, NULL, NULL,
	    NULL);

    corPtr->callerEEPtr = iPtr->execEnvPtr;
    iPtr->execEnvPtr = corPtr->eePtr;
    return TclExecuteByteCode(interp, NULL);
}

int
TclNRCoroutineObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Command *cmdPtr;
    CoroutineData *corPtr;
    Tcl_Obj *cmdObjPtr;
    CallFrame *framePtr, **framePtrPtr;
    TEOV_callback *rootPtr = TOP_CB(interp);
    char *fullName;
    const char *procName;
    Namespace *nsPtr, *altNsPtr, *cxtNsPtr;
    Tcl_DString ds;

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "name cmd ?arg ...?");
	return TCL_ERROR;
    }

    /*
     * FIXME: this is copy/pasted from Tcl_ProcObjCommand. Should have
     * something in tclUtil.c to find the FQ name.
     */

    fullName = TclGetString(objv[1]);
    TclGetNamespaceForQualName(interp, fullName, NULL, 0,
	    &nsPtr, &altNsPtr, &cxtNsPtr, &procName);

    if (nsPtr == NULL) {
	Tcl_AppendResult(interp, "can't create procedure \"", fullName,
		"\": unknown namespace", NULL);
	return TCL_ERROR;
    }
    if (procName == NULL) {
	Tcl_AppendResult(interp, "can't create procedure \"", fullName,
		"\": bad procedure name", NULL);
	return TCL_ERROR;
    }
    if ((nsPtr != iPtr->globalNsPtr)
	    && (procName != NULL) && (procName[0] == ':')) {
	Tcl_AppendResult(interp, "can't create procedure \"", procName,
		"\" in non-global namespace with name starting with \":\"",
		NULL);
	return TCL_ERROR;
    }

    corPtr = (CoroutineData *) ckalloc(sizeof(CoroutineData));
    corPtr->eePtr = TclCreateExecEnv(interp);
    corPtr->callerEEPtr = iPtr->execEnvPtr;
    corPtr->eePtr->corPtr = corPtr;
    corPtr->stackLevel = NULL;

    /*
     * On first run just set a 0 level-offset, the natural numbering is
     * correct. The offset will be fixed for later runs.
     */

    Tcl_DStringInit(&ds);
    if (nsPtr != iPtr->globalNsPtr) {
	Tcl_DStringAppend(&ds, nsPtr->fullName, -1);
	Tcl_DStringAppend(&ds, "::", 2);
    }
    Tcl_DStringAppend(&ds, procName, -1);

    cmdPtr = (Command *) Tcl_NRCreateCommand(interp, Tcl_DStringValue(&ds),
	    /*objProc*/ NULL, NRInterpCoroutine, corPtr, DeleteCoroutine);
    Tcl_DStringFree(&ds);

    corPtr->cmdPtr = cmdPtr;
    cmdPtr->refCount++;

    /*
     * Be sure not to pass a canonical list for the command so that we insure
     * the body is bytecompiled: we need a TEBC instance to handle [yield]
     */

    cmdObjPtr = Tcl_NewListObj(objc-2, &objv[2]);
    TclGetString(cmdObjPtr);
    TclFreeIntRep(cmdObjPtr);
    cmdObjPtr->typePtr = NULL;
    Tcl_IncrRefCount(cmdObjPtr);

    /*
     * Set up the callback in caller execEnv and switch to the new execEnv.
     * Switch now so that the CallFrame is allocated on the new execEnv's
     * stack. Then push a CallFrame and CmdFrame.
     */

    TclNRAddCallback(interp, NRCoroutineCallerCallback, corPtr, NULL, NULL,
	    NULL);
    TclNRAddCallback(interp, NRCoroutineFirstCallback, corPtr, NULL, NULL,
	    NULL);
    SAVE_CONTEXT(corPtr->caller);

    iPtr->execEnvPtr = corPtr->eePtr;

    framePtrPtr = &framePtr;
    if (TCL_OK != TclPushStackFrame(interp, (Tcl_CallFrame **) framePtrPtr,
	    NULL, 0)) {
	corPtr->eePtr->corPtr = NULL;
	TclDeleteExecEnv(corPtr->eePtr);
	ckfree((char *) corPtr);
	return TCL_ERROR;
    }
    framePtr->objc = objc-2;
    framePtr->objv = &objv[2];

    SAVE_CONTEXT(corPtr->base);
    corPtr->running = NULL_CONTEXT;

    /*
     * Eval things in 'uplevel #0', except for the very first command lookup
     * which should be looked up in caller's context.
     *
     * A better approach would use the lambda infrastructure, but it is a bit
     * clumsy for now: we have the "lambda is a nameless proc" hack, we'd need
     * the cleaner "proc is a named lambda" to do this properly.
     */

    iPtr->varFramePtr = iPtr->rootFramePtr;
    iPtr->lookupNsPtr = iPtr->framePtr->nsPtr;
    corPtr->auxNumLevels = iPtr->numLevels;

    TclNRAddCallback(interp, NRCoroutineExitCallback, corPtr, NULL,NULL,NULL);
    return TclNRRunCallbacks(interp,
	    TclNREvalObjEx(interp, cmdObjPtr, 0, NULL, 0), rootPtr, 0);
}

/*
 * This is used in the [info] ensemble
 */

int
TclInfoCoroutineCmd(
    ClientData dummy,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    CoroutineData *corPtr = iPtr->execEnvPtr->corPtr;

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

    if (corPtr && !(corPtr->cmdPtr->flags & CMD_IS_DELETED)) {
	Tcl_Obj *namePtr;

	TclNewObj(namePtr);
	Tcl_GetCommandFullName(interp, (Tcl_Command) corPtr->cmdPtr, namePtr);
	Tcl_SetObjResult(interp, namePtr);
    }
    return TCL_OK;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */