summaryrefslogtreecommitdiffstats
path: root/generic/tclCompile.c
blob: dbd8db2c1411f5a75dd96fd7bfc43f855fd189ea (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
/*
 * tclCompile.c --
 *
 *	This file contains procedures that compile Tcl commands or parts of
 *	commands (like quoted strings or nested sub-commands) into a sequence
 *	of instructions ("bytecodes").
 *
 * Copyright (c) 1996-1998 Sun Microsystems, Inc.
 * Copyright (c) 2001 by Kevin B. Kenny. All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclCompile.c,v 1.111 2007/04/01 00:32:26 dkf Exp $
 */

#include "tclInt.h"
#include "tclCompile.h"

/*
 * Table of all AuxData types.
 */

static Tcl_HashTable auxDataTypeTable;
static int auxDataTypeTableInitialized; /* 0 means not yet initialized. */

TCL_DECLARE_MUTEX(tableMutex)

/*
 * Variable that controls whether compilation tracing is enabled and, if so,
 * what level of tracing is desired:
 *    0: no compilation tracing
 *    1: summarize compilation of top level cmds and proc bodies
 *    2: display all instructions of each ByteCode compiled
 * This variable is linked to the Tcl variable "tcl_traceCompile".
 */

#ifdef TCL_COMPILE_DEBUG
int tclTraceCompile = 0;
static int traceInitialized = 0;
#endif

/*
 * A table describing the Tcl bytecode instructions. Entries in this table
 * must correspond to the instruction opcode definitions in tclCompile.h. The
 * names "op1" and "op4" refer to an instruction's one or four byte first
 * operand. Similarly, "stktop" and "stknext" refer to the topmost and next to
 * topmost stack elements.
 *
 * Note that the load, store, and incr instructions do not distinguish local
 * from global variables; the bytecode interpreter at runtime uses the
 * existence of a procedure call frame to distinguish these.
 */

InstructionDesc tclInstructionTable[] = {
    /* Name	      Bytes stackEffect #Opnds  Operand types */
    {"done",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Finish ByteCode execution and return stktop (top stack item) */
    {"push1",		  2,   +1,         1,	{OPERAND_UINT1}},
	/* Push object at ByteCode objArray[op1] */
    {"push4",		  5,   +1,         1,	{OPERAND_UINT4}},
	/* Push object at ByteCode objArray[op4] */
    {"pop",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Pop the topmost stack object */
    {"dup",		  1,   +1,         0,	{OPERAND_NONE}},
	/* Duplicate the topmost stack object and push the result */
    {"concat1",		  2,   INT_MIN,    1,	{OPERAND_UINT1}},
	/* Concatenate the top op1 items and push result */
    {"invokeStk1",	  2,   INT_MIN,    1,	{OPERAND_UINT1}},
	/* Invoke command named objv[0]; <objc,objv> = <op1,top op1> */
    {"invokeStk4",	  5,   INT_MIN,    1,	{OPERAND_UINT4}},
	/* Invoke command named objv[0]; <objc,objv> = <op4,top op4> */
    {"evalStk",		  1,   0,          0,	{OPERAND_NONE}},
	/* Evaluate command in stktop using Tcl_EvalObj. */
    {"exprStk",		  1,   0,          0,	{OPERAND_NONE}},
	/* Execute expression in stktop using Tcl_ExprStringObj. */

    {"loadScalar1",	  2,   1,          1,	{OPERAND_LVT1}},
	/* Load scalar variable at index op1 <= 255 in call frame */
    {"loadScalar4",	  5,   1,          1,	{OPERAND_LVT4}},
	/* Load scalar variable at index op1 >= 256 in call frame */
    {"loadScalarStk",	  1,   0,          0,	{OPERAND_NONE}},
	/* Load scalar variable; scalar's name is stktop */
    {"loadArray1",	  2,   0,          1,	{OPERAND_LVT1}},
	/* Load array element; array at slot op1<=255, element is stktop */
    {"loadArray4",	  5,   0,          1,	{OPERAND_LVT4}},
	/* Load array element; array at slot op1 > 255, element is stktop */
    {"loadArrayStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Load array element; element is stktop, array name is stknext */
    {"loadStk",		  1,   0,          0,	{OPERAND_NONE}},
	/* Load general variable; unparsed variable name is stktop */
    {"storeScalar1",	  2,   0,          1,	{OPERAND_LVT1}},
	/* Store scalar variable at op1<=255 in frame; value is stktop */
    {"storeScalar4",	  5,   0,          1,	{OPERAND_LVT4}},
	/* Store scalar variable at op1 > 255 in frame; value is stktop */
    {"storeScalarStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Store scalar; value is stktop, scalar name is stknext */
    {"storeArray1",	  2,   -1,         1,	{OPERAND_LVT1}},
	/* Store array element; array at op1<=255, value is top then elem */
    {"storeArray4",	  5,   -1,         1,	{OPERAND_LVT4}},
	/* Store array element; array at op1>=256, value is top then elem */
    {"storeArrayStk",	  1,   -2,         0,	{OPERAND_NONE}},
	/* Store array element; value is stktop, then elem, array names */
    {"storeStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Store general variable; value is stktop, then unparsed name */

    {"incrScalar1",	  2,   0,          1,	{OPERAND_LVT1}},
	/* Incr scalar at index op1<=255 in frame; incr amount is stktop */
    {"incrScalarStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Incr scalar; incr amount is stktop, scalar's name is stknext */
    {"incrArray1",	  2,   -1,         1,	{OPERAND_LVT1}},
	/* Incr array elem; arr at slot op1<=255, amount is top then elem */
    {"incrArrayStk",	  1,   -2,         0,	{OPERAND_NONE}},
	/* Incr array element; amount is top then elem then array names */
    {"incrStk",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Incr general variable; amount is stktop then unparsed var name */
    {"incrScalar1Imm",	  3,   +1,         2,	{OPERAND_LVT1, OPERAND_INT1}},
	/* Incr scalar at slot op1 <= 255; amount is 2nd operand byte */
    {"incrScalarStkImm",  2,   0,          1,	{OPERAND_INT1}},
	/* Incr scalar; scalar name is stktop; incr amount is op1 */
    {"incrArray1Imm",	  3,   0,          2,	{OPERAND_LVT1, OPERAND_INT1}},
	/* Incr array elem; array at slot op1 <= 255, elem is stktop,
	 * amount is 2nd operand byte */
    {"incrArrayStkImm",	  2,   -1,         1,	{OPERAND_INT1}},
	/* Incr array element; elem is top then array name, amount is op1 */
    {"incrStkImm",	  2,   0,	   1,	{OPERAND_INT1}},
	/* Incr general variable; unparsed name is top, amount is op1 */

    {"jump1",		  2,   0,          1,	{OPERAND_INT1}},
	/* Jump relative to (pc + op1) */
    {"jump4",		  5,   0,          1,	{OPERAND_INT4}},
	/* Jump relative to (pc + op4) */
    {"jumpTrue1",	  2,   -1,         1,	{OPERAND_INT1}},
	/* Jump relative to (pc + op1) if stktop expr object is true */
    {"jumpTrue4",	  5,   -1,         1,	{OPERAND_INT4}},
	/* Jump relative to (pc + op4) if stktop expr object is true */
    {"jumpFalse1",	  2,   -1,         1,	{OPERAND_INT1}},
	/* Jump relative to (pc + op1) if stktop expr object is false */
    {"jumpFalse4",	  5,   -1,         1,	{OPERAND_INT4}},
	/* Jump relative to (pc + op4) if stktop expr object is false */

    {"lor",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Logical or:	push (stknext || stktop) */
    {"land",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Logical and:	push (stknext && stktop) */
    {"bitor",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Bitwise or:	push (stknext | stktop) */
    {"bitxor",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Bitwise xor	push (stknext ^ stktop) */
    {"bitand",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Bitwise and:	push (stknext & stktop) */
    {"eq",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Equal:	push (stknext == stktop) */
    {"neq",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Not equal:	push (stknext != stktop) */
    {"lt",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Less:	push (stknext < stktop) */
    {"gt",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Greater:	push (stknext || stktop) */
    {"le",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Logical or:	push (stknext || stktop) */
    {"ge",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Logical or:	push (stknext || stktop) */
    {"lshift",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Left shift:	push (stknext << stktop) */
    {"rshift",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Right shift:	push (stknext >> stktop) */
    {"add",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Add:		push (stknext + stktop) */
    {"sub",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Sub:		push (stkext - stktop) */
    {"mult",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Multiply:	push (stknext * stktop) */
    {"div",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Divide:	push (stknext / stktop) */
    {"mod",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Mod:		push (stknext % stktop) */
    {"uplus",		  1,   0,          0,	{OPERAND_NONE}},
	/* Unary plus:	push +stktop */
    {"uminus",		  1,   0,          0,	{OPERAND_NONE}},
	/* Unary minus:	push -stktop */
    {"bitnot",		  1,   0,          0,	{OPERAND_NONE}},
	/* Bitwise not:	push ~stktop */
    {"not",		  1,   0,          0,	{OPERAND_NONE}},
	/* Logical not:	push !stktop */
    {"callBuiltinFunc1",  2,   1,          1,	{OPERAND_UINT1}},
	/* Call builtin math function with index op1; any args are on stk */
    {"callFunc1",	  2,   INT_MIN,    1,	{OPERAND_UINT1}},
	/* Call non-builtin func objv[0]; <objc,objv>=<op1,top op1> */
    {"tryCvtToNumeric",	  1,   0,          0,	{OPERAND_NONE}},
	/* Try converting stktop to first int then double if possible. */

    {"break",		  1,   0,          0,	{OPERAND_NONE}},
	/* Abort closest enclosing loop; if none, return TCL_BREAK code. */
    {"continue",	  1,   0,          0,	{OPERAND_NONE}},
	/* Skip to next iteration of closest enclosing loop; if none, return
	 * TCL_CONTINUE code. */

    {"foreach_start4",	  5,   0,          1,	{OPERAND_AUX4}},
	/* Initialize execution of a foreach loop. Operand is aux data index
	 * of the ForeachInfo structure for the foreach command. */
    {"foreach_step4",	  5,   +1,         1,	{OPERAND_AUX4}},
	/* "Step" or begin next iteration of foreach loop. Push 0 if to
	 * terminate loop, else push 1. */

    {"beginCatch4",	  5,   0,          1,	{OPERAND_UINT4}},
	/* Record start of catch with the operand's exception index. Push the
	 * current stack depth onto a special catch stack. */
    {"endCatch",	  1,   0,          0,	{OPERAND_NONE}},
	/* End of last catch. Pop the bytecode interpreter's catch stack. */
    {"pushResult",	  1,   +1,         0,	{OPERAND_NONE}},
	/* Push the interpreter's object result onto the stack. */
    {"pushReturnCode",	  1,   +1,         0,	{OPERAND_NONE}},
	/* Push interpreter's return code (e.g. TCL_OK or TCL_ERROR) as a new
	 * object onto the stack. */

    {"streq",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Str Equal:	push (stknext eq stktop) */
    {"strneq",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Str !Equal:	push (stknext neq stktop) */
    {"strcmp",		  1,   -1,         0,	{OPERAND_NONE}},
	/* Str Compare:	push (stknext cmp stktop) */
    {"strlen",		  1,   0,          0,	{OPERAND_NONE}},
	/* Str Length:	push (strlen stktop) */
    {"strindex",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Str Index:	push (strindex stknext stktop) */
    {"strmatch",	  2,   -1,         1,	{OPERAND_INT1}},
	/* Str Match:	push (strmatch stknext stktop) opnd == nocase */

    {"list",		  5,   INT_MIN,    1,	{OPERAND_UINT4}},
	/* List:	push (stk1 stk2 ... stktop) */
    {"listIndex",	  1,   -1,         0,	{OPERAND_NONE}},
	/* List Index:	push (listindex stknext stktop) */
    {"listLength",	  1,   0,          0,	{OPERAND_NONE}},
	/* List Len:	push (listlength stktop) */

    {"appendScalar1",	  2,   0,          1,	{OPERAND_LVT1}},
	/* Append scalar variable at op1<=255 in frame; value is stktop */
    {"appendScalar4",	  5,   0,          1,	{OPERAND_LVT4}},
	/* Append scalar variable at op1 > 255 in frame; value is stktop */
    {"appendArray1",	  2,   -1,         1,	{OPERAND_LVT1}},
	/* Append array element; array at op1<=255, value is top then elem */
    {"appendArray4",	  5,   -1,         1,	{OPERAND_LVT4}},
	/* Append array element; array at op1>=256, value is top then elem */
    {"appendArrayStk",	  1,   -2,         0,	{OPERAND_NONE}},
	/* Append array element; value is stktop, then elem, array names */
    {"appendStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Append general variable; value is stktop, then unparsed name */
    {"lappendScalar1",	  2,   0,          1,	{OPERAND_LVT1}},
	/* Lappend scalar variable at op1<=255 in frame; value is stktop */
    {"lappendScalar4",	  5,   0,          1,	{OPERAND_LVT4}},
	/* Lappend scalar variable at op1 > 255 in frame; value is stktop */
    {"lappendArray1",	  2,   -1,         1,	{OPERAND_LVT1}},
	/* Lappend array element; array at op1<=255, value is top then elem */
    {"lappendArray4",	  5,   -1,         1,	{OPERAND_LVT4}},
	/* Lappend array element; array at op1>=256, value is top then elem */
    {"lappendArrayStk",	  1,   -2,         0,	{OPERAND_NONE}},
	/* Lappend array element; value is stktop, then elem, array names */
    {"lappendStk",	  1,   -1,         0,	{OPERAND_NONE}},
	/* Lappend general variable; value is stktop, then unparsed name */

    {"lindexMulti",	  5,   INT_MIN,    1,	{OPERAND_UINT4}},
	/* Lindex with generalized args, operand is number of stacked objs
	 * used: (operand-1) entries from stktop are the indices; then list to
	 * process. */
    {"over",		  5,   +1,         1,	{OPERAND_UINT4}},
	/* Duplicate the arg-th element from top of stack (TOS=0) */
    {"lsetList",          1,   -2,         0,	{OPERAND_NONE}},
	/* Four-arg version of 'lset'. stktop is old value; next is new
	 * element value, next is the index list; pushes new value */
    {"lsetFlat",          5,   INT_MIN,    1,	{OPERAND_UINT4}},
	/* Three- or >=5-arg version of 'lset', operand is number of stacked
	 * objs: stktop is old value, next is new element value, next come
	 * (operand-2) indices; pushes the new value.
	 */

    {"returnImm",	  9,   -1,         2,	{OPERAND_INT4, OPERAND_UINT4}},
	/* Compiled [return], code, level are operands; options and result
	 * are on the stack. */
    {"expon",		  1,   -1,	   0,	{OPERAND_NONE}},
	/* Binary exponentiation operator: push (stknext ** stktop) */

    /*
     * NOTE: the stack effects of expandStkTop and invokeExpanded are wrong -
     * but it cannot be done right at compile time, the stack effect is only
     * known at run time. The value for invokeExpanded is estimated better at
     * compile time.
     * See the comments further down in this file, where INST_INVOKE_EXPANDED
     * is emitted.
     */
    {"expandStart",       1,    0,          0,	{OPERAND_NONE}},
	/* Start of command with {expand}ed arguments */
    {"expandStkTop",      5,    0,          1,	{OPERAND_UINT4}},
	/* Expand the list at stacktop: push its elements on the stack */
    {"invokeExpanded",    1,    0,          0,	{OPERAND_NONE}},
	/* Invoke the command marked by the last 'expandStart' */

    {"listIndexImm",	  5,	0,	   1,	{OPERAND_IDX4}},
	/* List Index:	push (lindex stktop op4) */
    {"listRangeImm",	  9,	0,	   2,	{OPERAND_IDX4, OPERAND_IDX4}},
	/* List Range:	push (lrange stktop op4 op4) */
    {"startCommand",	  9,	0,	   1,	{OPERAND_INT4,OPERAND_UINT4}},
	/* Start of bytecoded command: op is the length of the cmd's code, op2
	 * is number of commands here */

    {"listIn",		  1,	-1,	   0,	{OPERAND_NONE}},
	/* List containment: push [lsearch stktop stknext]>=0) */
    {"listNotIn",	  1,	-1,	   0,	{OPERAND_NONE}},
	/* List negated containment: push [lsearch stktop stknext]<0) */

    {"pushReturnOpts",	  1,	+1,	   0,	{OPERAND_NONE}},
	/* Push the interpreter's return option dictionary as an object on the
	 * stack. */
    {"returnStk",	  1,	-2,	   0,	{OPERAND_NONE}},
	/* Compiled [return]; options and result are on the stack, code and
	 * level are in the options. */

    {"dictGet",		  5,	INT_MIN,   1,	{OPERAND_UINT4}},
	/* The top op4 words (min 1) are a key path into the dictionary just
	 * below the keys on the stack, and all those values are replaced by
	 * the value read out of that key-path (like [dict get]).
	 * Stack:  ... dict key1 ... keyN => ... value */
    {"dictSet",		  5,	INT_MIN,   2,	{OPERAND_UINT4, OPERAND_LVT4}},
	/* Update a dictionary value such that the keys are a path pointing to
	 * the value. op4#1 = numKeys, op4#2 = LVTindex
	 * Stack:  ... key1 ... keyN value => ... newDict */
    {"dictUnset",	  5,	INT_MIN,   2,	{OPERAND_UINT4, OPERAND_LVT4}},
	/* Update a dictionary value such that the keys are not a path pointing
	 * to any value. op4#1 = numKeys, op4#2 = LVTindex
	 * Stack:  ... key1 ... keyN => ... newDict */
    {"dictIncrImm",	  5,	0,	   2,	{OPERAND_INT4, OPERAND_LVT4}},
	/* Update a dictionary value such that the value pointed to by key is
	 * incremented by some value (or set to it if the key isn't in the
	 * dictionary at all). op4#1 = incrAmount, op4#2 = LVTindex
	 * Stack:  ... key => ... newDict */
    {"dictAppend",	  5,	-1,	   1,	{OPERAND_LVT4}},
	/* Update a dictionary value such that the value pointed to by key has
	 * some value string-concatenated onto it. op4 = LVTindex
	 * Stack:  ... key valueToAppend => ... newDict */
    {"dictLappend",	  5,	-1,	   1,	{OPERAND_LVT4}},
	/* Update a dictionary value such that the value pointed to by key has
	 * some value list-appended onto it. op4 = LVTindex
	 * Stack:  ... key valueToAppend => ... newDict */
    {"dictFirst",	  5,	+2,	   1,	{OPERAND_LVT4}},
	/* Begin iterating over the dictionary, using the local scalar
	 * indicated by op4 to hold the iterator state. If doneBool is true,
	 * dictDone *must* be called later on.
	 * Stack:  ... dict => ... value key doneBool */
    {"dictNext",	  5,	+3,	   1,	{OPERAND_LVT4}},
	/* Get the next iteration from the iterator in op4's local scalar.
	 * Stack:  ... => ... value key doneBool */
    {"dictDone",	  5,	0,	   1,	{OPERAND_LVT4}},
	/* Terminate the iterator in op4's local scalar. */
    {"dictUpdateStart",   5,    -1,	   2,	{OPERAND_LVT4, OPERAND_AUX4}},
	/* Create the variables (described in the aux data referred to by the
	 * second immediate argument) to mirror the state of the dictionary in
	 * the variable referred to by the first immediate argument. The list
	 * of keys (popped from the stack) must be the same length as the list
	 * of variables.
	 * Stack:  ... keyList => ... */
    {"dictUpdateEnd",	  5,    -1,	   1,	{OPERAND_LVT4, OPERAND_AUX4}},
	/* Reflect the state of local variables (described in the aux data
	 * referred to by the second immediate argument) back to the state of
	 * the dictionary in the variable referred to by the first immediate
	 * argument. The list of keys (popped from the stack) must be the same
	 * length as the list of variables.
	 * Stack:  ... keyList => ... */
    {"jumpTable",	  5,	-1,	   1,	{OPERAND_AUX4}},
	/* Jump according to the jump-table (in AuxData as indicated by the
	 * operand) and the argument popped from the list. Always executes the
	 * next instruction if no match against the table's entries was found.
	 * Stack:  ... value => ...
	 * Note that the jump table contains offsets relative to the PC when
	 * it points to this instruction; the code is relocatable. */
    {0}
};

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

static void		DupByteCodeInternalRep(Tcl_Obj *srcPtr,
			    Tcl_Obj *copyPtr);
static unsigned char *	EncodeCmdLocMap(CompileEnv *envPtr,
			    ByteCode *codePtr, unsigned char *startPtr);
static void		EnterCmdExtentData(CompileEnv *envPtr,
			    int cmdNumber, int numSrcBytes, int numCodeBytes);
static void		EnterCmdStartData(CompileEnv *envPtr,
			    int cmdNumber, int srcOffset, int codeOffset);
static void		FreeByteCodeInternalRep(Tcl_Obj *objPtr);
static int		GetCmdLocEncodingSize(CompileEnv *envPtr);
#ifdef TCL_COMPILE_STATS
static void		RecordByteCodeStats(ByteCode *codePtr);
#endif /* TCL_COMPILE_STATS */
static int		SetByteCodeFromAny(Tcl_Interp *interp,
			    Tcl_Obj *objPtr);
/*
 * TIP #280: Helper for building the per-word line information of all compiled
 * commands.
 */
static void		EnterCmdWordData(ExtCmdLoc *eclPtr, int srcOffset,
			    Tcl_Token *tokenPtr, const char *cmd, int len,
			    int numWords, int line, int **lines);

/*
 * The structure below defines the bytecode Tcl object type by means of
 * procedures that can be invoked by generic object code.
 */

Tcl_ObjType tclByteCodeType = {
    "bytecode",			/* name */
    FreeByteCodeInternalRep,	/* freeIntRepProc */
    DupByteCodeInternalRep,	/* dupIntRepProc */
    NULL,			/* updateStringProc */
    SetByteCodeFromAny		/* setFromAnyProc */
};

/*
 *----------------------------------------------------------------------
 *
 * TclSetByteCodeFromAny --
 *
 *	Part of the bytecode Tcl object type implementation. Attempts to
 *	generate an byte code internal form for the Tcl object "objPtr" by
 *	compiling its string representation. This function also takes a hook
 *	procedure that will be invoked to perform any needed post processing
 *	on the compilation results before generating byte codes.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during compilation, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	Frees the old internal representation. If no error occurs, then the
 *	compiled code is stored as "objPtr"s bytecode representation. Also, if
 *	debugging, initializes the "tcl_traceCompile" Tcl variable used to
 *	trace compilations.
 *
 *----------------------------------------------------------------------
 */

int
TclSetByteCodeFromAny(
    Tcl_Interp *interp,		/* The interpreter for which the code is being
				 * compiled. Must not be NULL. */
    Tcl_Obj *objPtr,		/* The object to make a ByteCode object. */
    CompileHookProc *hookProc,	/* Procedure to invoke after compilation. */
    ClientData clientData)	/* Hook procedure private data. */
{
    Interp *iPtr = (Interp *) interp;
    CompileEnv compEnv;		/* Compilation environment structure allocated
				 * in frame. */
    LiteralTable *localTablePtr = &(compEnv.localLitTable);
    register AuxData *auxDataPtr;
    LiteralEntry *entryPtr;
    register int i;
    int length, result = TCL_OK;
    char *stringPtr;

#ifdef TCL_COMPILE_DEBUG
    if (!traceInitialized) {
	if (Tcl_LinkVar(interp, "tcl_traceCompile",
		(char *) &tclTraceCompile, TCL_LINK_INT) != TCL_OK) {
	    Tcl_Panic("SetByteCodeFromAny: unable to create link for tcl_traceCompile variable");
	}
	traceInitialized = 1;
    }
#endif

    stringPtr = Tcl_GetStringFromObj(objPtr, &length);

    /*
     * TIP #280: Pick up the CmdFrame in which the BC compiler was invoked and
     * use to initialize the tracking in the compiler. This information was
     * stored by TclCompEvalObj and ProcCompileProc.
     */

    TclInitCompileEnv(interp, &compEnv, stringPtr, length,
	    iPtr->invokeCmdFramePtr, iPtr->invokeWord);
    TclCompileScript(interp, stringPtr, length, &compEnv);

    /*
     * Successful compilation. Add a "done" instruction at the end.
     */

    TclEmitOpcode(INST_DONE, &compEnv);

    /*
     * Invoke the compilation hook procedure if one exists.
     */

    if (hookProc) {
	result = (*hookProc)(interp, &compEnv, clientData);
    }

    /*
     * Change the object into a ByteCode object. Ownership of the literal
     * objects and aux data items is given to the ByteCode object.
     */

#ifdef TCL_COMPILE_DEBUG
    TclVerifyLocalLiteralTable(&compEnv);
#endif /*TCL_COMPILE_DEBUG*/

    TclInitByteCodeObj(objPtr, &compEnv);
#ifdef TCL_COMPILE_DEBUG
    if (tclTraceCompile >= 2) {
	TclPrintByteCodeObj(interp, objPtr);
    }
#endif /* TCL_COMPILE_DEBUG */

    if (result != TCL_OK) {
	/*
	 * Handle any error from the hookProc
	 */

	entryPtr = compEnv.literalArrayPtr;
	for (i = 0;  i < compEnv.literalArrayNext;  i++) {
	    TclReleaseLiteral(interp, entryPtr->objPtr);
	    entryPtr++;
	}
#ifdef TCL_COMPILE_DEBUG
	TclVerifyGlobalLiteralTable(iPtr);
#endif /*TCL_COMPILE_DEBUG*/

	auxDataPtr = compEnv.auxDataArrayPtr;
	for (i = 0;  i < compEnv.auxDataArrayNext;  i++) {
	    if (auxDataPtr->type->freeProc != NULL) {
		auxDataPtr->type->freeProc(auxDataPtr->clientData);
	    }
	    auxDataPtr++;
	}
    }

    /*
     * Free storage allocated during compilation.
     */

    if (localTablePtr->buckets != localTablePtr->staticBuckets) {
	ckfree((char *) localTablePtr->buckets);
    }
    TclFreeCompileEnv(&compEnv);
    return result;
}

/*
 *-----------------------------------------------------------------------
 *
 * SetByteCodeFromAny --
 *
 *	Part of the bytecode Tcl object type implementation. Attempts to
 *	generate an byte code internal form for the Tcl object "objPtr" by
 *	compiling its string representation.
 *
 * Results:
 *	The return value is a standard Tcl object result. If an error occurs
 *	during compilation, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 * Side effects:
 *	Frees the old internal representation. If no error occurs, then the
 *	compiled code is stored as "objPtr"s bytecode representation. Also, if
 *	debugging, initializes the "tcl_traceCompile" Tcl variable used to
 *	trace compilations.
 *
 *----------------------------------------------------------------------
 */

static int
SetByteCodeFromAny(
    Tcl_Interp *interp,		/* The interpreter for which the code is being
				 * compiled. Must not be NULL. */
    Tcl_Obj *objPtr)		/* The object to make a ByteCode object. */
{
    return TclSetByteCodeFromAny(interp, objPtr, NULL, (ClientData) NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * DupByteCodeInternalRep --
 *
 *	Part of the bytecode Tcl object type implementation. However, it does
 *	not copy the internal representation of a bytecode Tcl_Obj, but
 *	instead leaves the new object untyped (with a NULL type pointer).
 *	Code will be compiled for the new object only if necessary.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
DupByteCodeInternalRep(
    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    Tcl_Obj *copyPtr)		/* Object with internal rep to set. */
{
    return;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeByteCodeInternalRep --
 *
 *	Part of the bytecode Tcl object type implementation. Frees the storage
 *	associated with a bytecode object's internal representation unless its
 *	code is actively being executed.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The bytecode object's internal rep is marked invalid and its code gets
 *	freed unless the code is actively being executed. In that case the
 *	cleanup is delayed until the last execution of the code completes.
 *
 *----------------------------------------------------------------------
 */

static void
FreeByteCodeInternalRep(
    register Tcl_Obj *objPtr)	/* Object whose internal rep to free. */
{
    register ByteCode *codePtr = (ByteCode *)
	    objPtr->internalRep.otherValuePtr;

    codePtr->refCount--;
    if (codePtr->refCount <= 0) {
	TclCleanupByteCode(codePtr);
    }
    objPtr->typePtr = NULL;
    objPtr->internalRep.otherValuePtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCleanupByteCode --
 *
 *	This procedure does all the real work of freeing up a bytecode
 *	object's ByteCode structure. It's called only when the structure's
 *	reference count becomes zero.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees objPtr's bytecode internal representation and sets its type and
 *	objPtr->internalRep.otherValuePtr NULL. Also releases its literals and
 *	frees its auxiliary data items.
 *
 *----------------------------------------------------------------------
 */

void
TclCleanupByteCode(
    register ByteCode *codePtr)	/* Points to the ByteCode to free. */
{
    Tcl_Interp *interp = (Tcl_Interp *) *codePtr->interpHandle;
    Interp *iPtr = (Interp *) interp;
    int numLitObjects = codePtr->numLitObjects;
    int numAuxDataItems = codePtr->numAuxDataItems;
    register Tcl_Obj **objArrayPtr, *objPtr;
    register AuxData *auxDataPtr;
    int i;
#ifdef TCL_COMPILE_STATS

    if (interp != NULL) {
	ByteCodeStats *statsPtr;
	Tcl_Time destroyTime;
	int lifetimeSec, lifetimeMicroSec, log2;

	statsPtr = &((Interp *) interp)->stats;

	statsPtr->numByteCodesFreed++;
	statsPtr->currentSrcBytes -= (double) codePtr->numSrcBytes;
	statsPtr->currentByteCodeBytes -= (double) codePtr->structureSize;

	statsPtr->currentInstBytes -= (double) codePtr->numCodeBytes;
	statsPtr->currentLitBytes -= (double)
		codePtr->numLitObjects * sizeof(Tcl_Obj *);
	statsPtr->currentExceptBytes -= (double)
		codePtr->numExceptRanges * sizeof(ExceptionRange);
	statsPtr->currentAuxBytes -= (double)
		codePtr->numAuxDataItems * sizeof(AuxData);
	statsPtr->currentCmdMapBytes -= (double) codePtr->numCmdLocBytes;

	Tcl_GetTime(&destroyTime);
	lifetimeSec = destroyTime.sec - codePtr->createTime.sec;
	if (lifetimeSec > 2000) {	/* avoid overflow */
	    lifetimeSec = 2000;
	}
	lifetimeMicroSec = 1000000 * lifetimeSec +
		(destroyTime.usec - codePtr->createTime.usec);

	log2 = TclLog2(lifetimeMicroSec);
	if (log2 > 31) {
	    log2 = 31;
	}
	statsPtr->lifetimeCount[log2]++;
    }
#endif /* TCL_COMPILE_STATS */

    /*
     * A single heap object holds the ByteCode structure and its code, object,
     * command location, and auxiliary data arrays. This means we only need to
     * 1) decrement the ref counts of the LiteralEntry's in its literal array,
     * 2) call the free procs for the auxiliary data items, and 3) free the
     * ByteCode structure's heap object.
     *
     * The case for TCL_BYTECODE_PRECOMPILED (precompiled ByteCodes, like
     * those generated from tbcload) is special, as they doesn't make use of
     * the global literal table. They instead maintain private references to
     * their literals which must be decremented.
     *
     * In order to insure a proper and efficient cleanup of the literal array
     * when it contains non-shared literals [Bug 983660], we also distinguish
     * the case of an interpreter being deleted (signaled by interp == NULL).
     * Also, as the interp deletion will remove the global literal table
     * anyway, we avoid the extra cost of updating it for each literal being
     * released.
     */

    if ((codePtr->flags & TCL_BYTECODE_PRECOMPILED) || (interp == NULL)) {

	objArrayPtr = codePtr->objArrayPtr;
	for (i = 0;  i < numLitObjects;  i++) {
	    objPtr = *objArrayPtr;
	    if (objPtr) {
		Tcl_DecrRefCount(objPtr);
	    }
	    objArrayPtr++;
	}
	codePtr->numLitObjects = 0;
    } else {
	objArrayPtr = codePtr->objArrayPtr;
	for (i = 0;  i < numLitObjects;  i++) {
	    /*
	     * TclReleaseLiteral sets a ByteCode's object array entry NULL to
	     * indicate that it has already freed the literal.
	     */

	    objPtr = *objArrayPtr;
	    if (objPtr != NULL) {
		TclReleaseLiteral(interp, objPtr);
	    }
	    objArrayPtr++;
	}
    }

    auxDataPtr = codePtr->auxDataArrayPtr;
    for (i = 0;  i < numAuxDataItems;  i++) {
	if (auxDataPtr->type->freeProc != NULL) {
	    (auxDataPtr->type->freeProc)(auxDataPtr->clientData);
	}
	auxDataPtr++;
    }

    /*
     * TIP #280. Release the location data associated with this byte code
     * structure, if any. NOTE: The interp we belong to may be gone already,
     * and the data with it.
     *
     * See also tclBasic.c, DeleteInterpProc
     */

    if (iPtr) {
	Tcl_HashEntry *hePtr = Tcl_FindHashEntry(iPtr->lineBCPtr,
		(char *) codePtr);
	if (hePtr) {
	    ExtCmdLoc *eclPtr = Tcl_GetHashValue(hePtr);
	    int i;

	    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);
	    }

	    ckfree((char *) eclPtr);
	    Tcl_DeleteHashEntry(hePtr);
	}
    }

    TclHandleRelease(codePtr->interpHandle);
    ckfree((char *) codePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitCompileEnv --
 *
 *	Initializes a CompileEnv compilation environment structure for the
 *	compilation of a string in an interpreter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The CompileEnv structure is initialized.
 *
 *----------------------------------------------------------------------
 */

void
TclInitCompileEnv(
    Tcl_Interp *interp,		/* The interpreter for which a CompileEnv
				 * structure is initialized. */
    register CompileEnv *envPtr,/* Points to the CompileEnv structure to
				 * initialize. */
    char *stringPtr,		/* The source string to be compiled. */
    int numBytes,		/* Number of bytes in source string. */
    const CmdFrame *invoker,	/* Location context invoking the bcc */
    int word)			/* Index of the word in that context getting
				 * compiled */
{
    Interp *iPtr = (Interp *) interp;

    envPtr->iPtr = iPtr;
    envPtr->source = stringPtr;
    envPtr->numSrcBytes = numBytes;
    envPtr->procPtr = iPtr->compiledProcPtr;
    envPtr->numCommands = 0;
    envPtr->exceptDepth = 0;
    envPtr->maxExceptDepth = 0;
    envPtr->maxStackDepth = 0;
    envPtr->currStackDepth = 0;
    TclInitLiteralTable(&(envPtr->localLitTable));

    envPtr->codeStart = envPtr->staticCodeSpace;
    envPtr->codeNext = envPtr->codeStart;
    envPtr->codeEnd = (envPtr->codeStart + COMPILEENV_INIT_CODE_BYTES);
    envPtr->mallocedCodeArray = 0;

    envPtr->literalArrayPtr = envPtr->staticLiteralSpace;
    envPtr->literalArrayNext = 0;
    envPtr->literalArrayEnd = COMPILEENV_INIT_NUM_OBJECTS;
    envPtr->mallocedLiteralArray = 0;

    envPtr->exceptArrayPtr = envPtr->staticExceptArraySpace;
    envPtr->exceptArrayNext = 0;
    envPtr->exceptArrayEnd = COMPILEENV_INIT_EXCEPT_RANGES;
    envPtr->mallocedExceptArray = 0;

    envPtr->cmdMapPtr = envPtr->staticCmdMapSpace;
    envPtr->cmdMapEnd = COMPILEENV_INIT_CMD_MAP_SIZE;
    envPtr->mallocedCmdMap = 0;
    envPtr->atCmdStart = 0;

    /*
     * TIP #280: Set up the extended command location information, based on
     * the context invoking the byte code compiler. This structure is used to
     * keep the per-word line information for all compiled commands.
     *
     * See also tclBasic.c, TclEvalObjEx, for the equivalent code in the
     * non-compiling evaluator
     */

    envPtr->extCmdMapPtr = (ExtCmdLoc *) ckalloc(sizeof(ExtCmdLoc));
    envPtr->extCmdMapPtr->loc = NULL;
    envPtr->extCmdMapPtr->nloc = 0;
    envPtr->extCmdMapPtr->nuloc = 0;
    envPtr->extCmdMapPtr->path = NULL;

    if (invoker == NULL) {
        /*
	 * Initialize the compiler for relative counting.
	 */

	envPtr->line = 1;
	envPtr->extCmdMapPtr->type =
		(envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);
    } else {
        /*
	 * Initialize the compiler using the context, making counting absolute
	 * to that context. Note that the context can be byte code execution.
	 * In that case we have to fill out the missing pieces (line, path,
	 * ...) which may make change the type as well.
	 */

	if ((invoker->nline <= word) || (invoker->line[word] < 0)) {
	    /*
	     * Word is not a literal, relative counting.
	     */

	    envPtr->line = 1;
	    envPtr->extCmdMapPtr->type =
		    (envPtr->procPtr ? TCL_LOCATION_PROC : TCL_LOCATION_BC);
	} else {
	    CmdFrame ctx = *invoker;
	    int pc = 0;

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

		TclGetSrcInfoForPc(&ctx);
		pc = 1;
	    }

	    envPtr->line = ctx.line[word];
	    envPtr->extCmdMapPtr->type = ctx.type;

	    if (ctx.type == TCL_LOCATION_SOURCE) {
		if (pc) {
		    /*
		     * The reference 'TclGetSrcInfoForPc' made is transfered.
		     */

		    envPtr->extCmdMapPtr->path = ctx.data.eval.path;
		    ctx.data.eval.path = NULL;
		} else {
		    /*
		     * We have a new reference here.
		     */

		    envPtr->extCmdMapPtr->path = ctx.data.eval.path;
		    Tcl_IncrRefCount(envPtr->extCmdMapPtr->path);
		}
	    }
	}
    }

    envPtr->auxDataArrayPtr = envPtr->staticAuxDataArraySpace;
    envPtr->auxDataArrayNext = 0;
    envPtr->auxDataArrayEnd = COMPILEENV_INIT_AUX_DATA_SIZE;
    envPtr->mallocedAuxDataArray = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFreeCompileEnv --
 *
 *	Free the storage allocated in a CompileEnv compilation environment
 *	structure.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocated storage in the CompileEnv structure is freed. Note that its
 *	local literal table is not deleted and its literal objects are not
 *	released. In addition, storage referenced by its auxiliary data items
 *	is not freed. This is done so that, when compilation is successful,
 *	"ownership" of these objects and aux data items is handed over to the
 *	corresponding ByteCode structure.
 *
 *----------------------------------------------------------------------
 */

void
TclFreeCompileEnv(
    register CompileEnv *envPtr)/* Points to the CompileEnv structure. */
{
    if (envPtr->mallocedCodeArray) {
	ckfree((char *) envPtr->codeStart);
    }
    if (envPtr->mallocedLiteralArray) {
	ckfree((char *) envPtr->literalArrayPtr);
    }
    if (envPtr->mallocedExceptArray) {
	ckfree((char *) envPtr->exceptArrayPtr);
    }
    if (envPtr->mallocedCmdMap) {
	ckfree((char *) envPtr->cmdMapPtr);
    }
    if (envPtr->mallocedAuxDataArray) {
	ckfree((char *) envPtr->auxDataArrayPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclWordKnownAtCompileTime --
 *
 *	Test whether the value of a token is completely known at compile time.
 *
 * Results:
 *	Returns true if the tokenPtr argument points to a word value that is
 *	completely known at compile time. Generally, values that are known at
 *	compile time can be compiled to their values, while values that cannot
 *	be known until substitution at runtime must be compiled to bytecode
 *	instructions that perform that substitution. For several commands,
 *	whether or not arguments are known at compile time determine whether
 *	it is worthwhile to compile at all.
 *
 * Side effects:
 *	When returning true, appends the known value of the word to the
 *	unshared Tcl_Obj (*valuePtr), unless valuePtr is NULL.
 *
 *----------------------------------------------------------------------
 */

int
TclWordKnownAtCompileTime(
    Tcl_Token *tokenPtr,	/* Points to Tcl_Token we should check */
    Tcl_Obj *valuePtr)		/* If not NULL, points to an unshared Tcl_Obj
				 * to which we should append the known value
				 * of the word. */
{
    int numComponents = tokenPtr->numComponents;
    Tcl_Obj *tempPtr = NULL;

    if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD) {
	if (valuePtr != NULL) {
	    Tcl_AppendToObj(valuePtr, tokenPtr[1].start, tokenPtr[1].size);
	}
	return 1;
    }
    if (tokenPtr->type != TCL_TOKEN_WORD) {
	return 0;
    }
    tokenPtr++;
    if (valuePtr != NULL) {
	tempPtr = Tcl_NewObj();
	Tcl_IncrRefCount(tempPtr);
    }
    while (numComponents--) {
	switch (tokenPtr->type) {
	case TCL_TOKEN_TEXT:
	    if (tempPtr != NULL) {
		Tcl_AppendToObj(tempPtr, tokenPtr->start, tokenPtr->size);
	    }
	    break;

	case TCL_TOKEN_BS:
	    if (tempPtr != NULL) {
		char utfBuf[TCL_UTF_MAX];
		int length = Tcl_UtfBackslash(tokenPtr->start, NULL, utfBuf);
		Tcl_AppendToObj(tempPtr, utfBuf, length);
	    }
	    break;

	default:
	    if (tempPtr != NULL) {
		Tcl_DecrRefCount(tempPtr);
	    }
	    return 0;
	}
	tokenPtr++;
    }
    if (valuePtr != NULL) {
	Tcl_AppendObjToObj(valuePtr, tempPtr);
	Tcl_DecrRefCount(tempPtr);
    }
    return 1;
}

int
TclWordSimpleExpansion(
    Tcl_Token *tokenPtr)	/* Points to Tcl_Token we should check */
{
    int numComponents = tokenPtr->numComponents;

    if (tokenPtr->type != TCL_TOKEN_EXPAND_WORD) {
	return 0;
    }
    tokenPtr++;
    while (numComponents--) {
	switch (tokenPtr->type) {
	case TCL_TOKEN_TEXT:
	    break;

	default:
	    return 0;
	}
	tokenPtr++;
    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileScript --
 *
 *	Compile a Tcl script in a string.
 *
 * Results:
 *	The return value is TCL_OK on a successful compilation and TCL_ERROR
 *	on failure. If TCL_ERROR is returned, then the interpreter's result
 *	contains an error message.
 *
 * Side effects:
 *	Adds instructions to envPtr to evaluate the script at runtime.
 *
 *----------------------------------------------------------------------
 */

void
TclCompileScript(
    Tcl_Interp *interp,		/* Used for error and status reporting. Also
				 * serves as context for finding and compiling
				 * commands. May not be NULL. */
    const char *script,		/* The source script to compile. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first null character. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Interp *iPtr = (Interp *) interp;
    Tcl_Parse parse;
    int lastTopLevelCmdIndex = -1;
    				/* Index of most recent toplevel command in
 				 * the command location table. Initialized to
 				 * avoid compiler warning. */
    int startCodeOffset = -1;	/* Offset of first byte of current command's
				 * code. Init. to avoid compiler warning. */
    unsigned char *entryCodeNext = envPtr->codeNext;
    const char *p, *next;
    Namespace *cmdNsPtr;
    Command *cmdPtr;
    Tcl_Token *tokenPtr;
    int bytesLeft, isFirstCmd, gotParse, wordIdx, currCmdIndex;
    int commandLength, objIndex;
    Tcl_DString ds;
    /* TIP #280 */
    ExtCmdLoc *eclPtr = envPtr->extCmdMapPtr;
    int *wlines;
    int wlineat, cmdLine;

    Tcl_DStringInit(&ds);

    if (numBytes < 0) {
	numBytes = strlen(script);
    }
    Tcl_ResetResult(interp);
    isFirstCmd = 1;

    if (envPtr->procPtr != NULL) {
	cmdNsPtr = envPtr->procPtr->cmdPtr->nsPtr;
    } else {
	cmdNsPtr = NULL;	/* use current NS */
    }

    /*
     * Each iteration through the following loop compiles the next command
     * from the script.
     */

    p = script;
    bytesLeft = numBytes;
    gotParse = 0;
    cmdLine = envPtr->line;
    do {
	if (Tcl_ParseCommand(interp, p, bytesLeft, 0, &parse) != TCL_OK) {
	    /*
	     * Compile bytecodes to report the parse error at runtime.
	     */

	    Tcl_Obj *returnCmd = Tcl_NewStringObj(
		    "return -code 1 -level 0 -errorinfo", -1);
	    Tcl_Obj *errMsg = Tcl_GetObjResult(interp);
	    Tcl_Obj *errInfo = Tcl_DuplicateObj(errMsg);
	    char *cmdString;
	    int cmdLength;
	    Tcl_Parse subParse;
	    int errorLine = 1;

	    Tcl_IncrRefCount(returnCmd);
	    Tcl_IncrRefCount(errInfo);
	    Tcl_AppendToObj(errInfo, "\n    while executing\n\"", -1);
	    Tcl_AppendLimitedToObj(errInfo, parse.commandStart,
		    /* Drop the command terminator (";","]") if appropriate */
		    (parse.term == parse.commandStart + parse.commandSize - 1)?
		    parse.commandSize - 1 : parse.commandSize, 153, NULL);
	    Tcl_AppendToObj(errInfo, "\"", -1);

	    Tcl_ListObjAppendElement(NULL, returnCmd, errInfo);

	    for (p = envPtr->source; p != parse.commandStart; p++) {
		if (*p == '\n') {
		    errorLine++;
		}
	    }
	    Tcl_ListObjAppendElement(NULL, returnCmd,
		    Tcl_NewStringObj("-errorline", -1));
	    Tcl_ListObjAppendElement(NULL, returnCmd,
		    Tcl_NewIntObj(errorLine));

	    Tcl_ListObjAppendElement(NULL, returnCmd, errMsg);
	    Tcl_DecrRefCount(errInfo);

	    cmdString = Tcl_GetStringFromObj(returnCmd, &cmdLength);
	    Tcl_ParseCommand(interp, cmdString, cmdLength, 0, &subParse);
	    TclCompileReturnCmd(interp, &subParse, envPtr);
	    Tcl_DecrRefCount(returnCmd);
	    Tcl_FreeParse(&subParse);
	    return;
	}
	gotParse = 1;
	if (parse.numWords > 0) {
	    int expand = 0;		/* Set if there are dynamic expansions
					 * to handle */
	    int eliterals = 0;		/* Set if there are literal expansions
					 * to handle. Actually the number of
					 * words in the expanded literals. */
	    int *exp = NULL;		/* For literal expansions, #words in
					 * the expansion. Only valid if the
					 * associated expLen[] value is not
					 * NULL. Can be 0, expansion to
					 * nothing. */
	    int **expLen = NULL;	/* Array of array of integers. Each
					 * array holds the lengths of the
					 * items in the expanded list. NULL
					 * indicates unexpanded words, or
					 * dynamically expanded words. */
	    char ***expItem = NULL;	/* Array of arrays of strings, holding
					 * pointers to the list elements,
					 * inside of the parsed script. No
					 * copies. For NULL, see expLen. */

	    /*
	     * If not the first command, pop the previous command's result
	     * and, if we're compiling a top level command, update the last
	     * command's code size to account for the pop instruction.
	     */

	    if (!isFirstCmd) {
		TclEmitOpcode(INST_POP, envPtr);
		envPtr->cmdMapPtr[lastTopLevelCmdIndex].numCodeBytes =
			(envPtr->codeNext - envPtr->codeStart)
			- startCodeOffset;
	    }

	    /*
	     * Determine the actual length of the command.
	     */

	    commandLength = parse.commandSize;
	    if (parse.term == parse.commandStart + commandLength - 1) {
		/*
		 * The command terminator character (such as ; or ]) is the
		 * last character in the parsed command. Reduce the length by
		 * one so that the trace message doesn't include the
		 * terminator character.
		 */

		commandLength -= 1;
	    }

#ifdef TCL_COMPILE_DEBUG
	    /*
	     * If tracing, print a line for each top level command compiled.
	     */

	    if ((tclTraceCompile >= 1) && (envPtr->procPtr == NULL)) {
		fprintf(stdout, "  Compiling: ");
		TclPrintSource(stdout, parse.commandStart,
			TclMin(commandLength, 55));
		fprintf(stdout, "\n");
	    }
#endif

	    /*
	     * Check whether expansion has been requested for any of the
	     * words. NOTE: If a word to be expanded is actually a literal
	     * list we will do the expansion here, directly manipulating the
	     * token array.
	     *
	     * Due to the search for literal expansions it is not possible
	     * (anymore) to abort when a dynamic expansion is found. There
	     * might be a literal one coming after.
	     */

	    exp = (int *) TclStackAlloc(interp, sizeof(int) * parse.numWords);
	    expLen = (int **) TclStackAlloc(interp,
		    sizeof(int *) * parse.numWords);
	    expItem = (char ***) TclStackAlloc(interp,
		    sizeof(char **) * parse.numWords);

	    for (wordIdx = 0, tokenPtr = parse.tokenPtr;
		    wordIdx < parse.numWords;
		    wordIdx++, tokenPtr += (tokenPtr->numComponents + 1)) {
		exp[wordIdx] = -1;
		expLen[wordIdx] = NULL;
		expItem[wordIdx] = NULL;

		if (tokenPtr->type == TCL_TOKEN_EXPAND_WORD) {
		    if (TclWordSimpleExpansion(tokenPtr)) {
			const char *start = (tokenPtr+1)->start;
			const char *end =
				(tokenPtr+tokenPtr->numComponents)->start +
				(tokenPtr+tokenPtr->numComponents)->size;

			if (TclMarkList(NULL, start, end, exp+wordIdx,
				(const int **)(expLen+wordIdx),
				(const char ***)(expItem+wordIdx)) != TCL_OK) {
			    /*
			     * We're trying to expand a literal that is not a
			     * well-formed list. No option but to punt the
			     * problem to run-time; arrange for compilation of
			     * this term as an expansion.
			     */

			    expand = 1;
			} else {
			    eliterals += exp[wordIdx] ? exp[wordIdx] : 1;
			}
		    } else {
			expand = 1;
		    }
		}
	    }

	    if (eliterals) {
		Tcl_Token *copy = parse.tokenPtr;
		int new;
		int objIdx;

		parse.tokensAvailable += eliterals + eliterals;

		/*
		 * eliterals times 2 - simple_word, and text tokens.
		 */

		parse.tokenPtr = (Tcl_Token *)
			ckalloc(sizeof(Tcl_Token) * parse.tokensAvailable);
		parse.numTokens = 0;

		for (objIdx=0, wordIdx=0, tokenPtr=copy, new=0;
			wordIdx < parse.numWords;
			wordIdx++, tokenPtr += tokenPtr->numComponents+1) {
		    if (expLen[wordIdx]) {
			/*
			 * Expansion of a simple literal. We already have the
			 * list elements which become the words. Now we `just`
			 * have to create their tokens. The token array
			 * already has the proper size to contain them all.
			 */

			int k;
			for (k = 0; k < exp[wordIdx]; k++) {
			    Tcl_Token *t = &parse.tokenPtr[objIdx];

			    t->type = TCL_TOKEN_SIMPLE_WORD;
			    t->start = expItem[wordIdx][k];
			    t->size = expLen[wordIdx][k];
			    t->numComponents = 1;
			    t++;

			    t->type = TCL_TOKEN_TEXT;
			    t->start = expItem[wordIdx][k];
			    t->size = expLen[wordIdx][k];
			    t->numComponents = 0;

			    objIdx += 2;
			    new ++;
			}

			ckfree((char *) expLen[wordIdx]);
			ckfree((char *) expItem[wordIdx]);
		    } else {
			/*
			 * Regular word token. Copy as is, including subtree.
			 */

			int k;

			new++;
			for (k=0 ; k<=tokenPtr->numComponents ; k++) {
			    parse.tokenPtr[objIdx++] = tokenPtr[k];
			}
		    }
		}
		parse.numTokens = objIdx;
		parse.numWords = new;

		if (copy != parse.staticTokens) {
		    ckfree((char *) copy);
		}
	    }

	    TclStackFree(interp);	/* expItem */
	    TclStackFree(interp);	/* expLen */
	    TclStackFree(interp);	/* exp */

	    envPtr->numCommands++;
	    currCmdIndex = (envPtr->numCommands - 1);
	    lastTopLevelCmdIndex = currCmdIndex;
	    startCodeOffset = (envPtr->codeNext - envPtr->codeStart);
	    EnterCmdStartData(envPtr, currCmdIndex,
		    parse.commandStart - envPtr->source, startCodeOffset);

	    /*
	     * Should only start issuing instructions after the "command has
	     * started" so that the command range is correct in the bytecode.
	     */

	    if (expand) {
		TclEmitOpcode(INST_EXPAND_START, envPtr);
	    }

	    /*
	     * TIP #280. Scan the words and compute the extended location
	     * information. The map first contain full per-word line
	     * information for use by the compiler. This is later replaced by
	     * a reduced form which signals non-literal words, stored in
	     * 'wlines'.
	     */

	    TclAdvanceLines(&cmdLine, p, parse.commandStart);
	    EnterCmdWordData(eclPtr, parse.commandStart - envPtr->source,
		    parse.tokenPtr, parse.commandStart, parse.commandSize,
		    parse.numWords, cmdLine, &wlines);
	    wlineat = eclPtr->nuloc - 1;

	    /*
	     * Each iteration of the following loop compiles one word from the
	     * command.
	     */

	    for (wordIdx = 0, tokenPtr = parse.tokenPtr;
		    wordIdx < parse.numWords; wordIdx++,
		    tokenPtr += (tokenPtr->numComponents + 1)) {

		envPtr->line = eclPtr->loc[wlineat].line[wordIdx];
		if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
		    /*
		     * The word is not a simple string of characters.
		     */

		    TclCompileTokens(interp, tokenPtr+1,
			    tokenPtr->numComponents, envPtr);
		    if (tokenPtr->type == TCL_TOKEN_EXPAND_WORD) {
			TclEmitInstInt4(INST_EXPAND_STKTOP,
				envPtr->currStackDepth, envPtr);
		    }
		    continue;
		}

		/*
		 * This is a simple string of literal characters (i.e. we know
		 * it absolutely and can use it directly). If this is the
		 * first word and the command has a compile procedure, let it
		 * compile the command.
		 */

		if ((wordIdx == 0) && !expand) {
		    /*
		     * We copy the string before trying to find the command by
		     * name. We used to modify the string in place, but this
		     * is not safe because the name resolution handlers could
		     * have side effects that rely on the unmodified string.
		     */

		    Tcl_DStringSetLength(&ds, 0);
		    Tcl_DStringAppend(&ds, tokenPtr[1].start,tokenPtr[1].size);

		    cmdPtr = (Command *) Tcl_FindCommand(interp,
			    Tcl_DStringValue(&ds),
			    (Tcl_Namespace *) cmdNsPtr, /*flags*/ 0);

		    if ((cmdPtr != NULL)
			    && (cmdPtr->compileProc != NULL)
			    && !(cmdPtr->flags & CMD_HAS_EXEC_TRACES)
			    && !(iPtr->flags & DONT_COMPILE_CMDS_INLINE)) {
			int savedNumCmds = envPtr->numCommands;
			unsigned int savedCodeNext =
				envPtr->codeNext - envPtr->codeStart;
			int update = 0, code;

			/*
			 * Mark the start of the command; the proper bytecode
			 * length will be updated later. There is no need to
			 * do this for the first command in the compile env,
			 * as the check is done before calling
			 * TclExecuteByteCode(). Remark that we are compiling
			 * the first cmd in the environment exactly when
			 * (savedCodeNext == 0)
			 */

			if (savedCodeNext != 0) {
			    if (envPtr->atCmdStart) {
				/*
				 * Increase the number of commands being
				 * started at the current point. Note that
				 * this depends on the exact layout of the
				 * INST_START_CMD's operands, so be careful!
				 */

				unsigned char *fixPtr = envPtr->codeNext - 4;

				TclStoreInt4AtPtr(TclGetUInt4AtPtr(fixPtr)+1,
					fixPtr);
			    } else {
				TclEmitInstInt4(INST_START_CMD, 0, envPtr);
				TclEmitInt4(1, envPtr);
				update = 1;
			    }
			}

			code = (cmdPtr->compileProc)(interp, &parse, envPtr);

			if (code == TCL_OK) {
			    if (update) {
				/*
				 * Fix the bytecode length.
				 */

				unsigned char *fixPtr = envPtr->codeStart
					+ savedCodeNext + 1;
				unsigned int fixLen = envPtr->codeNext
					- envPtr->codeStart - savedCodeNext;

				TclStoreInt4AtPtr(fixLen, fixPtr);
			    }
			    goto finishCommand;
			} else {
			    /*
			     * Restore numCommands and codeNext to their
			     * correct values, removing any commands compiled
			     * before the failure to produce bytecode got
			     * reported. [Bugs 705406 and 735055]
			     */

			    envPtr->numCommands = savedNumCmds;
			    envPtr->codeNext = envPtr->codeStart+savedCodeNext;
			}
		    }

		    /*
		     * No compile procedure so push the word. If the command
		     * was found, push a CmdName object to reduce runtime
		     * lookups. Avoid sharing this literal among different
		     * namespaces to reduce shimmering.
		     */

		    objIndex = TclRegisterNewNSLiteral(envPtr,
			    tokenPtr[1].start, tokenPtr[1].size);
		    if (cmdPtr != NULL) {
			TclSetCmdNameObj(interp,
			      envPtr->literalArrayPtr[objIndex].objPtr,cmdPtr);
		    }
		    if ((wordIdx == 0) && (parse.numWords == 1)) {
			/*
			 * Single word script: unshare the command name to
			 * avoid shimmering between bytecode and cmdName
			 * representations [Bug 458361]
			 */

			TclHideLiteral(interp, envPtr, objIndex);
		    }
		} else {
		    objIndex = TclRegisterNewLiteral(envPtr,
			    tokenPtr[1].start, tokenPtr[1].size);
		}
		TclEmitPush(objIndex, envPtr);
	    } /* for loop */

	    /*
	     * Emit an invoke instruction for the command. We skip this if a
	     * compile procedure was found for the command.
	     */

	    if (expand) {
		/*
		 * The stack depth during argument expansion can only be
		 * managed at runtime, as the number of elements in the
		 * expanded lists is not known at compile time. We adjust here
		 * the stack depth estimate so that it is correct after the
		 * command with expanded arguments returns.
		 *
		 * The end effect of this command's invocation is that all the
		 * words of the command are popped from the stack, and the
		 * result is pushed: the stack top changes by (1-wordIdx).
		 *
		 * Note that the estimates are not correct while the command
		 * is being prepared and run, INST_EXPAND_STKTOP is not
		 * stack-neutral in general.
		 */

		TclEmitOpcode(INST_INVOKE_EXPANDED, envPtr);
		TclAdjustStackDepth((1-wordIdx), envPtr);
	    } else if (wordIdx > 0) {
		if (wordIdx <= 255) {
		    TclEmitInstInt1(INST_INVOKE_STK1, wordIdx, envPtr);
		} else {
		    TclEmitInstInt4(INST_INVOKE_STK4, wordIdx, envPtr);
		}
	    }

	    /*
	     * Update the compilation environment structure and record the
	     * offsets of the source and code for the command.
	     */

	finishCommand:
	    EnterCmdExtentData(envPtr, currCmdIndex, commandLength,
		    (envPtr->codeNext-envPtr->codeStart) - startCodeOffset);
	    isFirstCmd = 0;

	    /*
	     * TIP #280: Free full form of per-word line data and insert the
	     * reduced form now
	     */

	    ckfree((char *) eclPtr->loc[wlineat].line);
	    eclPtr->loc[wlineat].line = wlines;
	} /* end if parse.numWords > 0 */

	/*
	 * Advance to the next command in the script.
	 */

	next = parse.commandStart + parse.commandSize;
	bytesLeft -= next - p;
	p = next;

	/*
	 * TIP #280: Track lines in the just compiled command.
	 */

	TclAdvanceLines(&cmdLine, parse.commandStart, p);
	Tcl_FreeParse(&parse);
	gotParse = 0;
    } while (bytesLeft > 0);

    /*
     * If the source script yielded no instructions (e.g., if it was empty),
     * push an empty string as the command's result.
     *
     * WARNING: push an unshared object! If the script being compiled is a
     * shared empty string, it will otherwise be self-referential and cause
     * difficulties with literal management [Bugs 467523, 983660]. We used to
     * have special code in TclReleaseLiteral to handle this particular
     * self-reference, but now opt for avoiding its creation altogether.
     */

    if (envPtr->codeNext == entryCodeNext) {
	TclEmitPush(TclAddLiteralObj(envPtr, Tcl_NewObj(), NULL), envPtr);
    }

    envPtr->numSrcBytes = (p - script);
    Tcl_DStringFree(&ds);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileTokens --
 *
 *	Given an array of tokens parsed from a Tcl command (e.g., the tokens
 *	that make up a word) this procedure emits instructions to evaluate the
 *	tokens and concatenate their values to form a single result value on
 *	the interpreter's runtime evaluation stack.
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs, an
 *	error message is left in the interpreter's result.
 *
 * Side effects:
 *	Instructions are added to envPtr to push and evaluate the tokens at
 *	runtime.
 *
 *----------------------------------------------------------------------
 */

void
TclCompileTokens(
    Tcl_Interp *interp,		/* Used for error and status reporting. */
    Tcl_Token *tokenPtr,	/* Pointer to first in an array of tokens to
				 * compile. */
    int count,			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_DString textBuffer;	/* Holds concatenated chars from adjacent
				 * TCL_TOKEN_TEXT, TCL_TOKEN_BS tokens. */
    char buffer[TCL_UTF_MAX];
    const char *name, *p;
    int numObjsToConcat, nameBytes, localVarName, localVar;
    int length, i;
    unsigned char *entryCodeNext = envPtr->codeNext;

    Tcl_DStringInit(&textBuffer);
    numObjsToConcat = 0;
    for ( ;  count > 0;  count--, tokenPtr++) {
	switch (tokenPtr->type) {
	case TCL_TOKEN_TEXT:
	    Tcl_DStringAppend(&textBuffer, tokenPtr->start, tokenPtr->size);
	    break;

	case TCL_TOKEN_BS:
	    length = Tcl_UtfBackslash(tokenPtr->start, NULL, buffer);
	    Tcl_DStringAppend(&textBuffer, buffer, length);
	    break;

	case TCL_TOKEN_COMMAND:
	    /*
	     * Push any accumulated chars appearing before the command.
	     */

	    if (Tcl_DStringLength(&textBuffer) > 0) {
		int literal;

		literal = TclRegisterNewLiteral(envPtr,
			Tcl_DStringValue(&textBuffer),
			Tcl_DStringLength(&textBuffer));
		TclEmitPush(literal, envPtr);
		numObjsToConcat++;
		Tcl_DStringFree(&textBuffer);
	    }

	    TclCompileScript(interp, tokenPtr->start+1,
		    tokenPtr->size-2, envPtr);
	    numObjsToConcat++;
	    break;

	case TCL_TOKEN_VARIABLE:
	    /*
	     * Push any accumulated chars appearing before the $<var>.
	     */

	    if (Tcl_DStringLength(&textBuffer) > 0) {
		int literal;

		literal = TclRegisterNewLiteral(envPtr,
			Tcl_DStringValue(&textBuffer),
			Tcl_DStringLength(&textBuffer));
		TclEmitPush(literal, envPtr);
		numObjsToConcat++;
		Tcl_DStringFree(&textBuffer);
	    }

	    /*
	     * Determine how the variable name should be handled: if it
	     * contains any namespace qualifiers it is not a local variable
	     * (localVarName=-1); if it looks like an array element and the
	     * token has a single component, it should not be created here
	     * [Bug 569438] (localVarName=0); otherwise, the local variable
	     * can safely be created (localVarName=1).
	     */

	    name = tokenPtr[1].start;
	    nameBytes = tokenPtr[1].size;
	    localVarName = -1;
	    if (envPtr->procPtr != NULL) {
		localVarName = 1;
		for (i = 0, p = name;  i < nameBytes;  i++, p++) {
		    if ((*p == ':') && (i < nameBytes-1) && (*(p+1) == ':')) {
			localVarName = -1;
			break;
		    } else if ((*p == '(')
			    && (tokenPtr->numComponents == 1)
			    && (*(name + nameBytes - 1) == ')')) {
			localVarName = 0;
			break;
		    }
		}
	    }

	    /*
	     * Either push the variable's name, or find its index in the array
	     * of local variables in a procedure frame.
	     */

	    localVar = -1;
	    if (localVarName != -1) {
		localVar = TclFindCompiledLocal(name, nameBytes, localVarName,
			/*flags*/ 0, envPtr->procPtr);
	    }
	    if (localVar < 0) {
		TclEmitPush(TclRegisterNewLiteral(envPtr, name, nameBytes),
			envPtr);
	    }

	    /*
	     * Emit instructions to load the variable.
	     */

	    if (tokenPtr->numComponents == 1) {
		if (localVar < 0) {
		    TclEmitOpcode(INST_LOAD_SCALAR_STK, envPtr);
		} else if (localVar <= 255) {
		    TclEmitInstInt1(INST_LOAD_SCALAR1, localVar, envPtr);
		} else {
		    TclEmitInstInt4(INST_LOAD_SCALAR4, localVar, envPtr);
		}
	    } else {
		TclCompileTokens(interp, tokenPtr+2,
			tokenPtr->numComponents-1, envPtr);
		if (localVar < 0) {
		    TclEmitOpcode(INST_LOAD_ARRAY_STK, envPtr);
		} else if (localVar <= 255) {
		    TclEmitInstInt1(INST_LOAD_ARRAY1, localVar, envPtr);
		} else {
		    TclEmitInstInt4(INST_LOAD_ARRAY4, localVar, envPtr);
		}
	    }
	    numObjsToConcat++;
	    count -= tokenPtr->numComponents;
	    tokenPtr += tokenPtr->numComponents;
	    break;

	default:
	    Tcl_Panic("Unexpected token type in TclCompileTokens");
	}
    }

    /*
     * Push any accumulated characters appearing at the end.
     */

    if (Tcl_DStringLength(&textBuffer) > 0) {
	int literal;

	literal = TclRegisterNewLiteral(envPtr, Tcl_DStringValue(&textBuffer),
		Tcl_DStringLength(&textBuffer));
	TclEmitPush(literal, envPtr);
	numObjsToConcat++;
    }

    /*
     * If necessary, concatenate the parts of the word.
     */

    while (numObjsToConcat > 255) {
	TclEmitInstInt1(INST_CONCAT1, 255, envPtr);
	numObjsToConcat -= 254;	/* concat pushes 1 obj, the result */
    }
    if (numObjsToConcat > 1) {
	TclEmitInstInt1(INST_CONCAT1, numObjsToConcat, envPtr);
    }

    /*
     * If the tokens yielded no instructions, push an empty string.
     */

    if (envPtr->codeNext == entryCodeNext) {
	TclEmitPush(TclRegisterNewLiteral(envPtr, "", 0), envPtr);
    }
    Tcl_DStringFree(&textBuffer);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileCmdWord --
 *
 *	Given an array of parse tokens for a word containing one or more Tcl
 *	commands, emit inline instructions to execute them. This procedure
 *	differs from TclCompileTokens in that a simple word such as a loop
 *	body enclosed in braces is not just pushed as a string, but is itself
 *	parsed into tokens and compiled.
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs, an
 *	error message is left in the interpreter's result.
 *
 * Side effects:
 *	Instructions are added to envPtr to execute the tokens at runtime.
 *
 *----------------------------------------------------------------------
 */

void
TclCompileCmdWord(
    Tcl_Interp *interp,		/* Used for error and status reporting. */
    Tcl_Token *tokenPtr,	/* Pointer to first in an array of tokens for
				 * a command word to compile inline. */
    int count,			/* Number of tokens to consider at tokenPtr.
				 * Must be at least 1. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    if ((count == 1) && (tokenPtr->type == TCL_TOKEN_TEXT)) {
	/*
	 * Handle the common case: if there is a single text token, compile it
	 * into an inline sequence of instructions.
	 */

	TclCompileScript(interp, tokenPtr->start, tokenPtr->size, envPtr);
    } else {
	/*
	 * Multiple tokens or the single token involves substitutions. Emit
	 * instructions to invoke the eval command procedure at runtime on the
	 * result of evaluating the tokens.
	 */

	TclCompileTokens(interp, tokenPtr, count, envPtr);
	TclEmitOpcode(INST_EVAL_STK, envPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileExprWords --
 *
 *	Given an array of parse tokens representing one or more words that
 *	contain a Tcl expression, emit inline instructions to execute the
 *	expression. This procedure differs from TclCompileExpr in that it
 *	supports Tcl's two-level substitution semantics for expressions that
 *	appear as command words.
 *
 * Results:
 *	The return value is a standard Tcl result. If an error occurs, an
 *	error message is left in the interpreter's result.
 *
 * Side effects:
 *	Instructions are added to envPtr to execute the expression.
 *
 *----------------------------------------------------------------------
 */

void
TclCompileExprWords(
    Tcl_Interp *interp,		/* Used for error and status reporting. */
    Tcl_Token *tokenPtr,	/* Points to first in an array of word tokens
				 * tokens for the expression to compile
				 * inline. */
    int numWords,		/* Number of word tokens starting at tokenPtr.
				 * Must be at least 1. Each word token
				 * contains one or more subtokens. */
    CompileEnv *envPtr)		/* Holds the resulting instructions. */
{
    Tcl_Token *wordPtr;
    int i, concatItems;

    /*
     * If the expression is a single word that doesn't require substitutions,
     * just compile its string into inline instructions.
     */

    if ((numWords == 1) && (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD)) {
	const char *script = tokenPtr[1].start;
	int numBytes = tokenPtr[1].size;
	int savedNumCmds = envPtr->numCommands;
	unsigned int savedCodeNext = envPtr->codeNext - envPtr->codeStart;

	if (TclCompileExpr(interp, script, numBytes, envPtr) == TCL_OK) {
	    return;
	}
	Tcl_ResetResult(interp);
	envPtr->numCommands = savedNumCmds;
	envPtr->codeNext = envPtr->codeStart + savedCodeNext;
    }

    /*
     * Emit code to call the expr command proc at runtime. Concatenate the
     * (already substituted once) expr tokens with a space between each.
     */

    wordPtr = tokenPtr;
    for (i = 0;  i < numWords;  i++) {
	TclCompileTokens(interp, wordPtr+1, wordPtr->numComponents, envPtr);
	if (i < (numWords - 1)) {
	    TclEmitPush(TclRegisterNewLiteral(envPtr, " ", 1), envPtr);
	}
	wordPtr += (wordPtr->numComponents + 1);
    }
    concatItems = 2*numWords - 1;
    while (concatItems > 255) {
	TclEmitInstInt1(INST_CONCAT1, 255, envPtr);
	concatItems -= 254;
    }
    if (concatItems > 1) {
	TclEmitInstInt1(INST_CONCAT1, concatItems, envPtr);
    }
    TclEmitOpcode(INST_EXPR_STK, envPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileNoOp --
 *
 *	Function called to compile no-op's
 *
 * Results:
 *	The return value is TCL_OK, indicating successful compilation.
 *
 * Side effects:
 *	Instructions are added to envPtr to execute a no-op at runtime. No
 *      result is pushed onto the stack: the compiler has to take care of this
 *      itself if the last compiled command is a NoOp. 
 *
 *----------------------------------------------------------------------
 */

int
TclCompileNoOp(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *tokenPtr;
    int i;
    int savedStackDepth = envPtr->currStackDepth;

    tokenPtr = parsePtr->tokenPtr;
    for(i = 1; i < parsePtr->numWords; i++) {
	tokenPtr = tokenPtr + tokenPtr->numComponents + 1;
	envPtr->currStackDepth = savedStackDepth;

	if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
	    TclCompileTokens(interp, tokenPtr+1, tokenPtr->numComponents,
		    envPtr);
	    TclEmitOpcode(INST_POP, envPtr);
	}
    }
    envPtr->currStackDepth = savedStackDepth;
    TclEmitPush(TclRegisterNewLiteral(envPtr, "", 0), envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitByteCodeObj --
 *
 *	Create a ByteCode structure and initialize it from a CompileEnv
 *	compilation environment structure. The ByteCode structure is smaller
 *	and contains just that information needed to execute the bytecode
 *	instructions resulting from compiling a Tcl script. The resulting
 *	structure is placed in the specified object.
 *
 * Results:
 *	A newly constructed ByteCode object is stored in the internal
 *	representation of the objPtr.
 *
 * Side effects:
 *	A single heap object is allocated to hold the new ByteCode structure
 *	and its code, object, command location, and aux data arrays. Note that
 *	"ownership" (i.e., the pointers to) the Tcl objects and aux data items
 *	will be handed over to the new ByteCode structure from the CompileEnv
 *	structure.
 *
 *----------------------------------------------------------------------
 */

void
TclInitByteCodeObj(
    Tcl_Obj *objPtr,		/* Points object that should be initialized,
				 * and whose string rep contains the source
				 * code. */
    register CompileEnv *envPtr)/* Points to the CompileEnv structure from
				 * which to create a ByteCode structure. */
{
    register ByteCode *codePtr;
    size_t codeBytes, objArrayBytes, exceptArrayBytes, cmdLocBytes;
    size_t auxDataArrayBytes, structureSize;
    register unsigned char *p;
#ifdef TCL_COMPILE_DEBUG
    unsigned char *nextPtr;
#endif
    int numLitObjects = envPtr->literalArrayNext;
    Namespace *namespacePtr;
    int i;
    int new;
    Interp *iPtr;

    iPtr = envPtr->iPtr;

    codeBytes = (envPtr->codeNext - envPtr->codeStart);
    objArrayBytes = (envPtr->literalArrayNext * sizeof(Tcl_Obj *));
    exceptArrayBytes = (envPtr->exceptArrayNext * sizeof(ExceptionRange));
    auxDataArrayBytes = (envPtr->auxDataArrayNext * sizeof(AuxData));
    cmdLocBytes = GetCmdLocEncodingSize(envPtr);

    /*
     * Compute the total number of bytes needed for this bytecode.
     */

    structureSize = sizeof(ByteCode);
    structureSize += TCL_ALIGN(codeBytes);	  /* align object array */
    structureSize += TCL_ALIGN(objArrayBytes);	  /* align exc range arr */
    structureSize += TCL_ALIGN(exceptArrayBytes); /* align AuxData array */
    structureSize += auxDataArrayBytes;
    structureSize += cmdLocBytes;

    if (envPtr->iPtr->varFramePtr != NULL) {
	namespacePtr = envPtr->iPtr->varFramePtr->nsPtr;
    } else {
	namespacePtr = envPtr->iPtr->globalNsPtr;
    }

    p = (unsigned char *) ckalloc((size_t) structureSize);
    codePtr = (ByteCode *) p;
    codePtr->interpHandle = TclHandlePreserve(iPtr->handle);
    codePtr->compileEpoch = iPtr->compileEpoch;
    codePtr->nsPtr = namespacePtr;
    codePtr->nsEpoch = namespacePtr->resolverEpoch;
    codePtr->refCount = 1;
    if (namespacePtr->compiledVarResProc || iPtr->resolverPtr) {
	codePtr->flags = TCL_BYTECODE_RESOLVE_VARS;
    } else {
	codePtr->flags = 0;
    }
    codePtr->source = envPtr->source;
    codePtr->procPtr = envPtr->procPtr;

    codePtr->numCommands = envPtr->numCommands;
    codePtr->numSrcBytes = envPtr->numSrcBytes;
    codePtr->numCodeBytes = codeBytes;
    codePtr->numLitObjects = numLitObjects;
    codePtr->numExceptRanges = envPtr->exceptArrayNext;
    codePtr->numAuxDataItems = envPtr->auxDataArrayNext;
    codePtr->numCmdLocBytes = cmdLocBytes;
    codePtr->maxExceptDepth = envPtr->maxExceptDepth;
    codePtr->maxStackDepth = envPtr->maxStackDepth;

    p += sizeof(ByteCode);
    codePtr->codeStart = p;
    memcpy(p, envPtr->codeStart, (size_t) codeBytes);

    p += TCL_ALIGN(codeBytes);		/* align object array */
    codePtr->objArrayPtr = (Tcl_Obj **) p;
    for (i = 0;  i < numLitObjects;  i++) {
	codePtr->objArrayPtr[i] = envPtr->literalArrayPtr[i].objPtr;
    }

    p += TCL_ALIGN(objArrayBytes);	/* align exception range array */
    if (exceptArrayBytes > 0) {
	codePtr->exceptArrayPtr = (ExceptionRange *) p;
	memcpy(p, envPtr->exceptArrayPtr, (size_t) exceptArrayBytes);
    } else {
	codePtr->exceptArrayPtr = NULL;
    }

    p += TCL_ALIGN(exceptArrayBytes);	/* align AuxData array */
    if (auxDataArrayBytes > 0) {
	codePtr->auxDataArrayPtr = (AuxData *) p;
	memcpy(p, envPtr->auxDataArrayPtr, (size_t) auxDataArrayBytes);
    } else {
	codePtr->auxDataArrayPtr = NULL;
    }

    p += auxDataArrayBytes;
#ifndef TCL_COMPILE_DEBUG
    EncodeCmdLocMap(envPtr, codePtr, (unsigned char *) p);
#else
    nextPtr = EncodeCmdLocMap(envPtr, codePtr, (unsigned char *) p);
    if (((size_t)(nextPtr - p)) != cmdLocBytes) {
	Tcl_Panic("TclInitByteCodeObj: encoded cmd location bytes %d != expected size %d", (nextPtr - p), cmdLocBytes);
    }
#endif

    /*
     * Record various compilation-related statistics about the new ByteCode
     * structure. Don't include overhead for statistics-related fields.
     */

#ifdef TCL_COMPILE_STATS
    codePtr->structureSize = structureSize
	    - (sizeof(size_t) + sizeof(Tcl_Time));
    Tcl_GetTime(&(codePtr->createTime));

    RecordByteCodeStats(codePtr);
#endif /* TCL_COMPILE_STATS */

    /*
     * Free the old internal rep then convert the object to a bytecode object
     * by making its internal rep point to the just compiled ByteCode.
     */

    TclFreeIntRep(objPtr);
    objPtr->internalRep.otherValuePtr = (void *) codePtr;
    objPtr->typePtr = &tclByteCodeType;

    /*
     * TIP #280. Associate the extended per-word line information with the
     * byte code object (internal rep), for use with the bc compiler.
     */

    Tcl_SetHashValue(Tcl_CreateHashEntry(iPtr->lineBCPtr, (char *) codePtr,
	    &new), envPtr->extCmdMapPtr);
    envPtr->extCmdMapPtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFindCompiledLocal --
 *
 *	This procedure is called at compile time to look up and optionally
 *	allocate an entry ("slot") for a variable in a procedure's array of
 *	local variables. If the variable's name is NULL, a new temporary
 *	variable is always created. (Such temporary variables can only be
 *	referenced using their slot index.)
 *
 * Results:
 *	If create is 0 and the name is non-NULL, then if the variable is
 *	found, the index of its entry in the procedure's array of local
 *	variables is returned; otherwise -1 is returned. If name is NULL, the
 *	index of a new temporary variable is returned. Finally, if create is 1
 *	and name is non-NULL, the index of a new entry is returned.
 *
 * Side effects:
 *	Creates and registers a new local variable if create is 1 and the
 *	variable is unknown, or if the name is NULL.
 *
 *----------------------------------------------------------------------
 */

int
TclFindCompiledLocal(
    register const char *name,	/* Points to first character of the name of a
				 * scalar or array variable. If NULL, a
				 * temporary var should be created. */
    int nameBytes,		/* Number of bytes in the name. */
    int create,			/* If 1, allocate a local frame entry for the
				 * variable if it is new. */
    int flags,			/* Flag bits for the compiled local if
				 * created. Only VAR_SCALAR, VAR_ARRAY, and
				 * VAR_LINK make sense. */
    register Proc *procPtr)	/* Points to structure describing procedure
				 * containing the variable reference. */
{
    register CompiledLocal *localPtr;
    int localVar = -1;
    register int i;

    /*
     * If not creating a temporary, does a local variable of the specified
     * name already exist?
     */

    if (name != NULL) {
	int localCt = procPtr->numCompiledLocals;

	localPtr = procPtr->firstLocalPtr;
	for (i = 0;  i < localCt;  i++) {
	    if (!TclIsVarTemporary(localPtr)) {
		char *localName = localPtr->name;

		if ((nameBytes == localPtr->nameLength) &&
			(strncmp(name,localName,(unsigned)nameBytes) == 0)) {
		    return i;
		}
	    }
	    localPtr = localPtr->nextPtr;
	}
    }

    /*
     * Create a new variable if appropriate.
     */

    if (create || (name == NULL)) {
	localVar = procPtr->numCompiledLocals;
	localPtr = (CompiledLocal *) ckalloc((unsigned)
		(sizeof(CompiledLocal) - sizeof(localPtr->name)
		+ nameBytes + 1));
	if (procPtr->firstLocalPtr == NULL) {
	    procPtr->firstLocalPtr = procPtr->lastLocalPtr = localPtr;
	} else {
	    procPtr->lastLocalPtr->nextPtr = localPtr;
	    procPtr->lastLocalPtr = localPtr;
	}
	localPtr->nextPtr = NULL;
	localPtr->nameLength = nameBytes;
	localPtr->frameIndex = localVar;
	localPtr->flags = flags | VAR_UNDEFINED;
	if (name == NULL) {
	    localPtr->flags |= VAR_TEMPORARY;
	}
	localPtr->defValuePtr = NULL;
	localPtr->resolveInfo = NULL;

	if (name != NULL) {
	    memcpy(localPtr->name, name, (size_t) nameBytes);
	}
	localPtr->name[nameBytes] = '\0';
	procPtr->numCompiledLocals++;
    }
    return localVar;

}
/*
 *----------------------------------------------------------------------
 *
 * TclExpandCodeArray --
 *
 *	Procedure that uses malloc to allocate more storage for a CompileEnv's
 *	code array.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The byte code array in *envPtr is reallocated to a new array of double
 *	the size, and if envPtr->mallocedCodeArray is non-zero the old array
 *	is freed. Byte codes are copied from the old array to the new one.
 *
 *----------------------------------------------------------------------
 */

void
TclExpandCodeArray(
    void *envArgPtr)		/* Points to the CompileEnv whose code array
				 * must be enlarged. */
{
    CompileEnv *envPtr = (CompileEnv *) envArgPtr;
				/* The CompileEnv containing the code array to
				 * be doubled in size. */

    /*
     * envPtr->codeNext is equal to envPtr->codeEnd. The currently defined
     * code bytes are stored between envPtr->codeStart and envPtr->codeNext-1
     * [inclusive].
     */

    size_t currBytes = (envPtr->codeNext - envPtr->codeStart);
    size_t newBytes = 2*(envPtr->codeEnd - envPtr->codeStart);

    if (envPtr->mallocedCodeArray) {
	envPtr->codeStart = (unsigned char *)
		ckrealloc((char *)envPtr->codeStart, newBytes);
    } else {
	/*
	 * envPtr->codeStart isn't a ckalloc'd pointer, so we must
	 * code a ckrealloc equivalent for ourselves.
	 */
	unsigned char *newPtr = (unsigned char *) ckalloc((unsigned) newBytes);
	memcpy(newPtr, envPtr->codeStart, currBytes);
	envPtr->codeStart = newPtr;
	envPtr->mallocedCodeArray = 1;
    }

    envPtr->codeNext = (envPtr->codeStart + currBytes);
    envPtr->codeEnd = (envPtr->codeStart + newBytes);
}

/*
 *----------------------------------------------------------------------
 *
 * EnterCmdStartData --
 *
 *	Registers the starting source and bytecode location of a command. This
 *	information is used at runtime to map between instruction pc and
 *	source locations.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Inserts source and code location information into the compilation
 *	environment envPtr for the command at index cmdIndex. The compilation
 *	environment's CmdLocation array is grown if necessary.
 *
 *----------------------------------------------------------------------
 */

static void
EnterCmdStartData(
    CompileEnv *envPtr,		/* Points to the compilation environment
				 * structure in which to enter command
				 * location information. */
    int cmdIndex,		/* Index of the command whose start data is
				 * being set. */
    int srcOffset,		/* Offset of first char of the command. */
    int codeOffset)		/* Offset of first byte of command code. */
{
    CmdLocation *cmdLocPtr;

    if ((cmdIndex < 0) || (cmdIndex >= envPtr->numCommands)) {
	Tcl_Panic("EnterCmdStartData: bad command index %d", cmdIndex);
    }

    if (cmdIndex >= envPtr->cmdMapEnd) {
	/*
	 * Expand the command location array by allocating more storage from
	 * the heap. The currently allocated CmdLocation entries are stored
	 * from cmdMapPtr[0] up to cmdMapPtr[envPtr->cmdMapEnd] (inclusive).
	 */

	size_t currElems = envPtr->cmdMapEnd;
	size_t newElems = 2*currElems;
	size_t currBytes = currElems * sizeof(CmdLocation);
	size_t newBytes = newElems * sizeof(CmdLocation);

	if (envPtr->mallocedCmdMap) {
	    envPtr->cmdMapPtr = (CmdLocation *)
		    ckrealloc((char *) envPtr->cmdMapPtr, newBytes);
	} else {
	    /*
	     * envPtr->cmdMapPtr isn't a ckalloc'd pointer, so we must
	     * code a ckrealloc equivalent for ourselves.
	     */
	    CmdLocation *newPtr = (CmdLocation *) ckalloc((unsigned) newBytes);
	    memcpy(newPtr, envPtr->cmdMapPtr, currBytes);
	    envPtr->cmdMapPtr = newPtr;
	    envPtr->mallocedCmdMap = 1;
	}
	envPtr->cmdMapEnd = newElems;
    }

    if (cmdIndex > 0) {
	if (codeOffset < envPtr->cmdMapPtr[cmdIndex-1].codeOffset) {
	    Tcl_Panic("EnterCmdStartData: cmd map not sorted by code offset");
	}
    }

    cmdLocPtr = &(envPtr->cmdMapPtr[cmdIndex]);
    cmdLocPtr->codeOffset = codeOffset;
    cmdLocPtr->srcOffset = srcOffset;
    cmdLocPtr->numSrcBytes = -1;
    cmdLocPtr->numCodeBytes = -1;
}

/*
 *----------------------------------------------------------------------
 *
 * EnterCmdExtentData --
 *
 *	Registers the source and bytecode length for a command. This
 *	information is used at runtime to map between instruction pc and
 *	source locations.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Inserts source and code length information into the compilation
 *	environment envPtr for the command at index cmdIndex. Starting source
 *	and bytecode information for the command must already have been
 *	registered.
 *
 *----------------------------------------------------------------------
 */

static void
EnterCmdExtentData(
    CompileEnv *envPtr,		/* Points to the compilation environment
				 * structure in which to enter command
				 * location information. */
    int cmdIndex,		/* Index of the command whose source and code
				 * length data is being set. */
    int numSrcBytes,		/* Number of command source chars. */
    int numCodeBytes)		/* Offset of last byte of command code. */
{
    CmdLocation *cmdLocPtr;

    if ((cmdIndex < 0) || (cmdIndex >= envPtr->numCommands)) {
	Tcl_Panic("EnterCmdExtentData: bad command index %d", cmdIndex);
    }

    if (cmdIndex > envPtr->cmdMapEnd) {
	Tcl_Panic("EnterCmdExtentData: missing start data for command %d",
		cmdIndex);
    }

    cmdLocPtr = &(envPtr->cmdMapPtr[cmdIndex]);
    cmdLocPtr->numSrcBytes = numSrcBytes;
    cmdLocPtr->numCodeBytes = numCodeBytes;
}

/*
 *----------------------------------------------------------------------
 * TIP #280
 *
 * EnterCmdWordData --
 *
 *	Registers the lines for the words of a command. This information is
 *	used at runtime by 'info frame'.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Inserts word location information into the compilation environment
 *	envPtr for the command at index cmdIndex. The compilation
 *	environment's ExtCmdLoc.ECL array is grown if necessary.
 *
 *----------------------------------------------------------------------
 */

static void
EnterCmdWordData(
    ExtCmdLoc *eclPtr,		/* Points to the map environment structure in
				 * which to enter command location
				 * information. */
    int srcOffset,		/* Offset of first char of the command. */
    Tcl_Token *tokenPtr,
    const char *cmd,
    int len,
    int numWords,
    int line,
    int **wlines)
{
    ECL *ePtr;
    const char *last;
    int wordIdx, wordLine, *wwlines;

    if (eclPtr->nuloc >= eclPtr->nloc) {
	/*
	 * Expand the ECL array by allocating more storage from the heap. The
	 * currently allocated ECL entries are stored from eclPtr->loc[0] up
	 * to eclPtr->loc[eclPtr->nuloc-1] (inclusive).
	 */

	size_t currElems = eclPtr->nloc;
	size_t newElems = (currElems ? 2*currElems : 1);
	size_t newBytes = newElems * sizeof(ECL);

	eclPtr->loc = (ECL *) ckrealloc((char *)(eclPtr->loc), newBytes);
	eclPtr->nloc = newElems;
    }

    ePtr = &eclPtr->loc[eclPtr->nuloc];
    ePtr->srcOffset = srcOffset;
    ePtr->line = (int *) ckalloc(numWords * sizeof(int));
    ePtr->nline = numWords;
    wwlines = (int *) ckalloc(numWords * sizeof(int));

    last = cmd;
    wordLine = line;
    for (wordIdx=0 ; wordIdx<numWords;
	    wordIdx++, tokenPtr += tokenPtr->numComponents + 1) {
        TclAdvanceLines(&wordLine, last, tokenPtr->start);
	wwlines[wordIdx] =
		(TclWordKnownAtCompileTime(tokenPtr, NULL) ? wordLine : -1);
	ePtr->line[wordIdx] = wordLine;
	last = tokenPtr->start;
    }

    *wlines = wwlines;
    eclPtr->nuloc ++;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCreateExceptRange --
 *
 *	Procedure that allocates and initializes a new ExceptionRange
 *	structure of the specified kind in a CompileEnv.
 *
 * Results:
 *	Returns the index for the newly created ExceptionRange.
 *
 * Side effects:
 *	If there is not enough room in the CompileEnv's ExceptionRange array,
 *	the array in expanded: a new array of double the size is allocated, if
 *	envPtr->mallocedExceptArray is non-zero the old array is freed, and
 *	ExceptionRange entries are copied from the old array to the new one.
 *
 *----------------------------------------------------------------------
 */

int
TclCreateExceptRange(
    ExceptionRangeType type,	/* The kind of ExceptionRange desired. */
    register CompileEnv *envPtr)/* Points to CompileEnv for which to create a
				 * new ExceptionRange structure. */
{
    register ExceptionRange *rangePtr;
    int index = envPtr->exceptArrayNext;

    if (index >= envPtr->exceptArrayEnd) {
	/*
	 * Expand the ExceptionRange array. The currently allocated entries
	 * are stored between elements 0 and (envPtr->exceptArrayNext - 1)
	 * [inclusive].
	 */

	size_t currBytes =
		envPtr->exceptArrayNext * sizeof(ExceptionRange);
	int newElems = 2*envPtr->exceptArrayEnd;
	size_t newBytes = newElems * sizeof(ExceptionRange);

	if (envPtr->mallocedExceptArray) {
	    envPtr->exceptArrayPtr = (ExceptionRange *)
		    ckrealloc((char *)(envPtr->exceptArrayPtr), newBytes);
	} else {
	    /*
	     * envPtr->exceptArrayPtr isn't a ckalloc'd pointer, so we must
	     * code a ckrealloc equivalent for ourselves.
	     */
	    ExceptionRange *newPtr = (ExceptionRange *)
		    ckalloc((unsigned) newBytes);
	    memcpy(newPtr, envPtr->exceptArrayPtr, currBytes);
	    envPtr->exceptArrayPtr = newPtr;
	    envPtr->mallocedExceptArray = 1;
	}
	envPtr->exceptArrayEnd = newElems;
    }
    envPtr->exceptArrayNext++;

    rangePtr = &(envPtr->exceptArrayPtr[index]);
    rangePtr->type = type;
    rangePtr->nestingLevel = envPtr->exceptDepth;
    rangePtr->codeOffset = -1;
    rangePtr->numCodeBytes = -1;
    rangePtr->breakOffset = -1;
    rangePtr->continueOffset = -1;
    rangePtr->catchOffset = -1;
    return index;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCreateAuxData --
 *
 *	Procedure that allocates and initializes a new AuxData structure in a
 *	CompileEnv's array of compilation auxiliary data records. These
 *	AuxData records hold information created during compilation by
 *	CompileProcs and used by instructions during execution.
 *
 * Results:
 *	Returns the index for the newly created AuxData structure.
 *
 * Side effects:
 *	If there is not enough room in the CompileEnv's AuxData array, the
 *	AuxData array in expanded: a new array of double the size is
 *	allocated, if envPtr->mallocedAuxDataArray is non-zero the old array
 *	is freed, and AuxData entries are copied from the old array to the new
 *	one.
 *
 *----------------------------------------------------------------------
 */

int
TclCreateAuxData(
    ClientData clientData,	/* The compilation auxiliary data to store in
				 * the new aux data record. */
    AuxDataType *typePtr,	/* Pointer to the type to attach to this
				 * AuxData */
    register CompileEnv *envPtr)/* Points to the CompileEnv for which a new
				 * aux data structure is to be allocated. */
{
    int index;			/* Index for the new AuxData structure. */
    register AuxData *auxDataPtr;
    				/* Points to the new AuxData structure */

    index = envPtr->auxDataArrayNext;
    if (index >= envPtr->auxDataArrayEnd) {
	/*
	 * Expand the AuxData array. The currently allocated entries are
	 * stored between elements 0 and (envPtr->auxDataArrayNext - 1)
	 * [inclusive].
	 */

	size_t currBytes = envPtr->auxDataArrayNext * sizeof(AuxData);
	int newElems = 2*envPtr->auxDataArrayEnd;
	size_t newBytes = newElems * sizeof(AuxData);

	if (envPtr->mallocedAuxDataArray) {
	    envPtr->auxDataArrayPtr = (AuxData *)
		    ckrealloc((char *)(envPtr->auxDataArrayPtr), newBytes);
	} else {
	    /*
	     * envPtr->auxDataArrayPtr isn't a ckalloc'd pointer, so we must
	     * code a ckrealloc equivalent for ourselves.
	     */
	    AuxData *newPtr = (AuxData *) ckalloc((unsigned) newBytes);
	    memcpy(newPtr, envPtr->auxDataArrayPtr, currBytes);
	    envPtr->auxDataArrayPtr = newPtr;
	    envPtr->mallocedAuxDataArray = 1;
	}
	envPtr->auxDataArrayEnd = newElems;
    }
    envPtr->auxDataArrayNext++;

    auxDataPtr = &(envPtr->auxDataArrayPtr[index]);
    auxDataPtr->clientData = clientData;
    auxDataPtr->type = typePtr;
    return index;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInitJumpFixupArray --
 *
 *	Initializes a JumpFixupArray structure to hold some number of jump
 *	fixup entries.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The JumpFixupArray structure is initialized.
 *
 *----------------------------------------------------------------------
 */

void
TclInitJumpFixupArray(
    register JumpFixupArray *fixupArrayPtr)
				/* Points to the JumpFixupArray structure to
				 * initialize. */
{
    fixupArrayPtr->fixup = fixupArrayPtr->staticFixupSpace;
    fixupArrayPtr->next = 0;
    fixupArrayPtr->end = (JUMPFIXUP_INIT_ENTRIES - 1);
    fixupArrayPtr->mallocedArray = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclExpandJumpFixupArray --
 *
 *	Procedure that uses malloc to allocate more storage for a jump fixup
 *	array.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The jump fixup array in *fixupArrayPtr is reallocated to a new array
 *	of double the size, and if fixupArrayPtr->mallocedArray is non-zero
 *	the old array is freed. Jump fixup structures are copied from the old
 *	array to the new one.
 *
 *----------------------------------------------------------------------
 */

void
TclExpandJumpFixupArray(
    register JumpFixupArray *fixupArrayPtr)
				/* Points to the JumpFixupArray structure
				 * to enlarge. */
{
    /*
     * The currently allocated jump fixup entries are stored from fixup[0] up
     * to fixup[fixupArrayPtr->fixupNext] (*not* inclusive). We assume
     * fixupArrayPtr->fixupNext is equal to fixupArrayPtr->fixupEnd.
     */

    size_t currBytes = fixupArrayPtr->next * sizeof(JumpFixup);
    int newElems = 2*(fixupArrayPtr->end + 1);
    size_t newBytes = newElems * sizeof(JumpFixup);

    if (fixupArrayPtr->mallocedArray) {
	fixupArrayPtr->fixup = (JumpFixup *)
		ckrealloc((char *)(fixupArrayPtr->fixup), newBytes);
    } else {
	/*
	 * fixupArrayPtr->fixup isn't a ckalloc'd pointer, so we must
	 * code a ckrealloc equivalent for ourselves.
	 */
	JumpFixup *newPtr = (JumpFixup *) ckalloc((unsigned) newBytes);
	memcpy(newPtr, fixupArrayPtr->fixup, currBytes);
	fixupArrayPtr->fixup = newPtr;
	fixupArrayPtr->mallocedArray = 1;
    }
    fixupArrayPtr->end = newElems;
}

/*
 *----------------------------------------------------------------------
 *
 * TclFreeJumpFixupArray --
 *
 *	Free any storage allocated in a jump fixup array structure.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocated storage in the JumpFixupArray structure is freed.
 *
 *----------------------------------------------------------------------
 */

void
TclFreeJumpFixupArray(
    register JumpFixupArray *fixupArrayPtr)
				/* Points to the JumpFixupArray structure to
				 * free. */
{
    if (fixupArrayPtr->mallocedArray) {
	ckfree((char *) fixupArrayPtr->fixup);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclEmitForwardJump --
 *
 *	Procedure to emit a two-byte forward jump of kind "jumpType". Since
 *	the jump may later have to be grown to five bytes if the jump target
 *	is more than, say, 127 bytes away, this procedure also initializes a
 *	JumpFixup record with information about the jump.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The JumpFixup record pointed to by "jumpFixupPtr" is initialized with
 *	information needed later if the jump is to be grown. Also, a two byte
 *	jump of the designated type is emitted at the current point in the
 *	bytecode stream.
 *
 *----------------------------------------------------------------------
 */

void
TclEmitForwardJump(
    CompileEnv *envPtr,		/* Points to the CompileEnv structure that
				 * holds the resulting instruction. */
    TclJumpType jumpType,	/* Indicates the kind of jump: if true or
				 * false or unconditional. */
    JumpFixup *jumpFixupPtr)	/* Points to the JumpFixup structure to
				 * initialize with information about this
				 * forward jump. */
{
    /*
     * Initialize the JumpFixup structure:
     *    - codeOffset is offset of first byte of jump below
     *    - cmdIndex is index of the command after the current one
     *    - exceptIndex is the index of the first ExceptionRange after the
     *	    current one.
     */

    jumpFixupPtr->jumpType = jumpType;
    jumpFixupPtr->codeOffset = (envPtr->codeNext - envPtr->codeStart);
    jumpFixupPtr->cmdIndex = envPtr->numCommands;
    jumpFixupPtr->exceptIndex = envPtr->exceptArrayNext;

    switch (jumpType) {
    case TCL_UNCONDITIONAL_JUMP:
	TclEmitInstInt1(INST_JUMP1, 0, envPtr);
	break;
    case TCL_TRUE_JUMP:
	TclEmitInstInt1(INST_JUMP_TRUE1, 0, envPtr);
	break;
    default:
	TclEmitInstInt1(INST_JUMP_FALSE1, 0, envPtr);
	break;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclFixupForwardJump --
 *
 *	Procedure that updates a previously-emitted forward jump to jump a
 *	specified number of bytes, "jumpDist". If necessary, the jump is grown
 *	from two to five bytes; this is done if the jump distance is greater
 *	than "distThreshold" (normally 127 bytes). The jump is described by a
 *	JumpFixup record previously initialized by TclEmitForwardJump.
 *
 * Results:
 *	1 if the jump was grown and subsequent instructions had to be moved;
 *	otherwise 0. This result is returned to allow callers to update any
 *	additional code offsets they may hold.
 *
 * Side effects:
 *	The jump may be grown and subsequent instructions moved. If this
 *	happens, the code offsets for any commands and any ExceptionRange
 *	records between the jump and the current code address will be updated
 *	to reflect the moved code. Also, the bytecode instruction array in the
 *	CompileEnv structure may be grown and reallocated.
 *
 *----------------------------------------------------------------------
 */

int
TclFixupForwardJump(
    CompileEnv *envPtr,		/* Points to the CompileEnv structure that
				 * holds the resulting instruction. */
    JumpFixup *jumpFixupPtr,	/* Points to the JumpFixup structure that
				 * describes the forward jump. */
    int jumpDist,		/* Jump distance to set in jump instr. */
    int distThreshold)		/* Maximum distance before the two byte jump
				 * is grown to five bytes. */
{
    unsigned char *jumpPc, *p;
    int firstCmd, lastCmd, firstRange, lastRange, k;
    unsigned int numBytes;

    if (jumpDist <= distThreshold) {
	jumpPc = (envPtr->codeStart + jumpFixupPtr->codeOffset);
	switch (jumpFixupPtr->jumpType) {
	case TCL_UNCONDITIONAL_JUMP:
	    TclUpdateInstInt1AtPc(INST_JUMP1, jumpDist, jumpPc);
	    break;
	case TCL_TRUE_JUMP:
	    TclUpdateInstInt1AtPc(INST_JUMP_TRUE1, jumpDist, jumpPc);
	    break;
	default:
	    TclUpdateInstInt1AtPc(INST_JUMP_FALSE1, jumpDist, jumpPc);
	    break;
	}
	return 0;
    }

    /*
     * We must grow the jump then move subsequent instructions down. Note that
     * if we expand the space for generated instructions, code addresses might
     * change; be careful about updating any of these addresses held in
     * variables.
     */

    if ((envPtr->codeNext + 3) > envPtr->codeEnd) {
	TclExpandCodeArray(envPtr);
    }
    jumpPc = (envPtr->codeStart + jumpFixupPtr->codeOffset);
    for (numBytes = envPtr->codeNext-jumpPc-2, p = jumpPc+2+numBytes-1;
	    numBytes > 0;  numBytes--, p--) {
	p[3] = p[0];
    }
    envPtr->codeNext += 3;
    jumpDist += 3;
    switch (jumpFixupPtr->jumpType) {
    case TCL_UNCONDITIONAL_JUMP:
	TclUpdateInstInt4AtPc(INST_JUMP4, jumpDist, jumpPc);
	break;
    case TCL_TRUE_JUMP:
	TclUpdateInstInt4AtPc(INST_JUMP_TRUE4, jumpDist, jumpPc);
	break;
    default:
	TclUpdateInstInt4AtPc(INST_JUMP_FALSE4, jumpDist, jumpPc);
	break;
    }

    /*
     * Adjust the code offsets for any commands and any ExceptionRange records
     * between the jump and the current code address.
     */

    firstCmd = jumpFixupPtr->cmdIndex;
    lastCmd = (envPtr->numCommands - 1);
    if (firstCmd < lastCmd) {
	for (k = firstCmd;  k <= lastCmd;  k++) {
	    (envPtr->cmdMapPtr[k]).codeOffset += 3;
	}
    }

    firstRange = jumpFixupPtr->exceptIndex;
    lastRange = (envPtr->exceptArrayNext - 1);
    for (k = firstRange;  k <= lastRange;  k++) {
	ExceptionRange *rangePtr = &(envPtr->exceptArrayPtr[k]);
	rangePtr->codeOffset += 3;

	switch (rangePtr->type) {
	case LOOP_EXCEPTION_RANGE:
	    rangePtr->breakOffset += 3;
	    if (rangePtr->continueOffset != -1) {
		rangePtr->continueOffset += 3;
	    }
	    break;
	case CATCH_EXCEPTION_RANGE:
	    rangePtr->catchOffset += 3;
	    break;
	default:
	    Tcl_Panic("TclFixupForwardJump: bad ExceptionRange type %d",
		    rangePtr->type);
	}
    }
    return 1;			/* the jump was grown */
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetInstructionTable --
 *
 *	Returns a pointer to the table describing Tcl bytecode instructions.
 *	This procedure is defined so that clients can access the pointer from
 *	outside the TCL DLLs.
 *
 * Results:
 *	Returns a pointer to the global instruction table, same as the
 *	expression (&tclInstructionTable[0]).
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void * /* == InstructionDesc* == */
TclGetInstructionTable(void)
{
    return &tclInstructionTable[0];
}

/*
 *--------------------------------------------------------------
 *
 * TclRegisterAuxDataType --
 *
 *	This procedure is called to register a new AuxData type in the table
 *	of all AuxData types supported by Tcl.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The type is registered in the AuxData type table. If there was already
 *	a type with the same name as in typePtr, it is replaced with the new
 *	type.
 *
 *--------------------------------------------------------------
 */

void
TclRegisterAuxDataType(
    AuxDataType *typePtr)	/* Information about object type; storage must
				 * be statically allocated (must live forever;
				 * will not be deallocated). */
{
    register Tcl_HashEntry *hPtr;
    int isNew;

    Tcl_MutexLock(&tableMutex);
    if (!auxDataTypeTableInitialized) {
	TclInitAuxDataTypeTable();
    }

    /*
     * If there's already a type with the given name, remove it.
     */

    hPtr = Tcl_FindHashEntry(&auxDataTypeTable, typePtr->name);
    if (hPtr != NULL) {
	Tcl_DeleteHashEntry(hPtr);
    }

    /*
     * Now insert the new object type.
     */

    hPtr = Tcl_CreateHashEntry(&auxDataTypeTable, typePtr->name, &isNew);
    if (isNew) {
	Tcl_SetHashValue(hPtr, typePtr);
    }
    Tcl_MutexUnlock(&tableMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetAuxDataType --
 *
 *	This procedure looks up an Auxdata type by name.
 *
 * Results:
 *	If an AuxData type with name matching "typeName" is found, a pointer
 *	to its AuxDataType structure is returned; otherwise, NULL is returned.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

AuxDataType *
TclGetAuxDataType(
    char *typeName)		/* Name of AuxData type to look up. */
{
    register Tcl_HashEntry *hPtr;
    AuxDataType *typePtr = NULL;

    Tcl_MutexLock(&tableMutex);
    if (!auxDataTypeTableInitialized) {
	TclInitAuxDataTypeTable();
    }

    hPtr = Tcl_FindHashEntry(&auxDataTypeTable, typeName);
    if (hPtr != NULL) {
	typePtr = (AuxDataType *) Tcl_GetHashValue(hPtr);
    }
    Tcl_MutexUnlock(&tableMutex);

    return typePtr;
}

/*
 *--------------------------------------------------------------
 *
 * TclInitAuxDataTypeTable --
 *
 *	This procedure is invoked to perform once-only initialization of the
 *	AuxData type table. It also registers the AuxData types defined in
 *	this file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Initializes the table of defined AuxData types "auxDataTypeTable" with
 *	builtin AuxData types defined in this file.
 *
 *--------------------------------------------------------------
 */

void
TclInitAuxDataTypeTable(void)
{
    /*
     * The table mutex must already be held before this routine is invoked.
     */

    auxDataTypeTableInitialized = 1;
    Tcl_InitHashTable(&auxDataTypeTable, TCL_STRING_KEYS);

    /*
     * There are only two AuxData type at this time, so register them here.
     */

    TclRegisterAuxDataType(&tclForeachInfoType);
    TclRegisterAuxDataType(&tclJumptableInfoType);
}

/*
 *----------------------------------------------------------------------
 *
 * TclFinalizeAuxDataTypeTable --
 *
 *	This procedure is called by Tcl_Finalize after all exit handlers have
 *	been run to free up storage associated with the table of AuxData
 *	types. This procedure is called by TclFinalizeExecution() which is
 *	called by Tcl_Finalize().
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deletes all entries in the hash table of AuxData types.
 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeAuxDataTypeTable(void)
{
    Tcl_MutexLock(&tableMutex);
    if (auxDataTypeTableInitialized) {
	Tcl_DeleteHashTable(&auxDataTypeTable);
	auxDataTypeTableInitialized = 0;
    }
    Tcl_MutexUnlock(&tableMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * GetCmdLocEncodingSize --
 *
 *	Computes the total number of bytes needed to encode the command
 *	location information for some compiled code.
 *
 * Results:
 *	The byte count needed to encode the compiled location information.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetCmdLocEncodingSize(
    CompileEnv *envPtr)		/* Points to compilation environment structure
				 * containing the CmdLocation structure to
				 * encode. */
{
    register CmdLocation *mapPtr = envPtr->cmdMapPtr;
    int numCmds = envPtr->numCommands;
    int codeDelta, codeLen, srcDelta, srcLen;
    int codeDeltaNext, codeLengthNext, srcDeltaNext, srcLengthNext;
				/* The offsets in their respective byte
				 * sequences where the next encoded offset or
				 * length should go. */
    int prevCodeOffset, prevSrcOffset, i;

    codeDeltaNext = codeLengthNext = srcDeltaNext = srcLengthNext = 0;
    prevCodeOffset = prevSrcOffset = 0;
    for (i = 0;  i < numCmds;  i++) {
	codeDelta = (mapPtr[i].codeOffset - prevCodeOffset);
	if (codeDelta < 0) {
	    Tcl_Panic("GetCmdLocEncodingSize: bad code offset");
	} else if (codeDelta <= 127) {
	    codeDeltaNext++;
	} else {
	    codeDeltaNext += 5;	 /* 1 byte for 0xFF, 4 for positive delta */
	}
	prevCodeOffset = mapPtr[i].codeOffset;

	codeLen = mapPtr[i].numCodeBytes;
	if (codeLen < 0) {
	    Tcl_Panic("GetCmdLocEncodingSize: bad code length");
	} else if (codeLen <= 127) {
	    codeLengthNext++;
	} else {
	    codeLengthNext += 5; /* 1 byte for 0xFF, 4 for length */
	}

	srcDelta = (mapPtr[i].srcOffset - prevSrcOffset);
	if ((-127 <= srcDelta) && (srcDelta <= 127)) {
	    srcDeltaNext++;
	} else {
	    srcDeltaNext += 5;	 /* 1 byte for 0xFF, 4 for delta */
	}
	prevSrcOffset = mapPtr[i].srcOffset;

	srcLen = mapPtr[i].numSrcBytes;
	if (srcLen < 0) {
	    Tcl_Panic("GetCmdLocEncodingSize: bad source length");
	} else if (srcLen <= 127) {
	    srcLengthNext++;
	} else {
	    srcLengthNext += 5;	 /* 1 byte for 0xFF, 4 for length */
	}
    }

    return (codeDeltaNext + codeLengthNext + srcDeltaNext + srcLengthNext);
}

/*
 *----------------------------------------------------------------------
 *
 * EncodeCmdLocMap --
 *
 *	Encode the command location information for some compiled code into a
 *	ByteCode structure. The encoded command location map is stored as
 *	three adjacent byte sequences.
 *
 * Results:
 *	Pointer to the first byte after the encoded command location
 *	information.
 *
 * Side effects:
 *	The encoded information is stored into the block of memory headed by
 *	codePtr. Also records pointers to the start of the four byte sequences
 *	in fields in codePtr's ByteCode header structure.
 *
 *----------------------------------------------------------------------
 */

static unsigned char *
EncodeCmdLocMap(
    CompileEnv *envPtr,		/* Points to compilation environment structure
				 * containing the CmdLocation structure to
				 * encode. */
    ByteCode *codePtr,		/* ByteCode in which to encode envPtr's
				 * command location information. */
    unsigned char *startPtr)	/* Points to the first byte in codePtr's
				 * memory block where the location information
				 * is to be stored. */
{
    register CmdLocation *mapPtr = envPtr->cmdMapPtr;
    int numCmds = envPtr->numCommands;
    register unsigned char *p = startPtr;
    int codeDelta, codeLen, srcDelta, srcLen, prevOffset;
    register int i;

    /*
     * Encode the code offset for each command as a sequence of deltas.
     */

    codePtr->codeDeltaStart = p;
    prevOffset = 0;
    for (i = 0;  i < numCmds;  i++) {
	codeDelta = (mapPtr[i].codeOffset - prevOffset);
	if (codeDelta < 0) {
	    Tcl_Panic("EncodeCmdLocMap: bad code offset");
	} else if (codeDelta <= 127) {
	    TclStoreInt1AtPtr(codeDelta, p);
	    p++;
	} else {
	    TclStoreInt1AtPtr(0xFF, p);
	    p++;
	    TclStoreInt4AtPtr(codeDelta, p);
	    p += 4;
	}
	prevOffset = mapPtr[i].codeOffset;
    }

    /*
     * Encode the code length for each command.
     */

    codePtr->codeLengthStart = p;
    for (i = 0;  i < numCmds;  i++) {
	codeLen = mapPtr[i].numCodeBytes;
	if (codeLen < 0) {
	    Tcl_Panic("EncodeCmdLocMap: bad code length");
	} else if (codeLen <= 127) {
	    TclStoreInt1AtPtr(codeLen, p);
	    p++;
	} else {
	    TclStoreInt1AtPtr(0xFF, p);
	    p++;
	    TclStoreInt4AtPtr(codeLen, p);
	    p += 4;
	}
    }

    /*
     * Encode the source offset for each command as a sequence of deltas.
     */

    codePtr->srcDeltaStart = p;
    prevOffset = 0;
    for (i = 0;  i < numCmds;  i++) {
	srcDelta = (mapPtr[i].srcOffset - prevOffset);
	if ((-127 <= srcDelta) && (srcDelta <= 127)) {
	    TclStoreInt1AtPtr(srcDelta, p);
	    p++;
	} else {
	    TclStoreInt1AtPtr(0xFF, p);
	    p++;
	    TclStoreInt4AtPtr(srcDelta, p);
	    p += 4;
	}
	prevOffset = mapPtr[i].srcOffset;
    }

    /*
     * Encode the source length for each command.
     */

    codePtr->srcLengthStart = p;
    for (i = 0;  i < numCmds;  i++) {
	srcLen = mapPtr[i].numSrcBytes;
	if (srcLen < 0) {
	    Tcl_Panic("EncodeCmdLocMap: bad source length");
	} else if (srcLen <= 127) {
	    TclStoreInt1AtPtr(srcLen, p);
	    p++;
	} else {
	    TclStoreInt1AtPtr(0xFF, p);
	    p++;
	    TclStoreInt4AtPtr(srcLen, p);
	    p += 4;
	}
    }

    return p;
}

#ifdef TCL_COMPILE_DEBUG
/*
 *----------------------------------------------------------------------
 *
 * TclPrintByteCodeObj --
 *
 *	This procedure prints ("disassembles") the instructions of a bytecode
 *	object to stdout.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TclPrintByteCodeObj(
    Tcl_Interp *interp,		/* Used only for Tcl_GetStringFromObj. */
    Tcl_Obj *objPtr)		/* The bytecode object to disassemble. */
{
    ByteCode *codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr;
    unsigned char *codeStart, *codeLimit, *pc;
    unsigned char *codeDeltaNext, *codeLengthNext;
    unsigned char *srcDeltaNext, *srcLengthNext;
    int codeOffset, codeLen, srcOffset, srcLen, numCmds, delta, i;
    Interp *iPtr = (Interp *) *codePtr->interpHandle;

    if (codePtr->refCount <= 0) {
	return;			/* already freed */
    }

    codeStart = codePtr->codeStart;
    codeLimit = (codeStart + codePtr->numCodeBytes);
    numCmds = codePtr->numCommands;

    /*
     * Print header lines describing the ByteCode.
     */

    fprintf(stdout,
	    "\nByteCode 0x%x, refCt %u, epoch %u, interp 0x%x (epoch %u)\n",
	    (unsigned int) codePtr, codePtr->refCount,
	    codePtr->compileEpoch, (unsigned int) iPtr,
	    iPtr->compileEpoch);
    fprintf(stdout, "  Source ");
    TclPrintSource(stdout, codePtr->source,
	    TclMin(codePtr->numSrcBytes, 55));
    fprintf(stdout, "\n  Cmds %d, src %d, inst %d, litObjs %u, aux %d, stkDepth %u, code/src %.2f\n",
	    numCmds, codePtr->numSrcBytes, codePtr->numCodeBytes,
	    codePtr->numLitObjects, codePtr->numAuxDataItems,
	    codePtr->maxStackDepth,
#ifdef TCL_COMPILE_STATS
	    codePtr->numSrcBytes?
		    codePtr->structureSize/(float)codePtr->numSrcBytes :
#endif
	    0.0);

#ifdef TCL_COMPILE_STATS
    fprintf(stdout,
	    "  Code %lu = header %lu+inst %d+litObj %lu+exc %lu+aux %lu+cmdMap %d\n",
	    (unsigned long) codePtr->structureSize,
	    (unsigned long) (sizeof(ByteCode) - (sizeof(size_t) + sizeof(Tcl_Time))),
	    codePtr->numCodeBytes,
	    (unsigned long) (codePtr->numLitObjects * sizeof(Tcl_Obj *)),
	    (unsigned long) (codePtr->numExceptRanges * sizeof(ExceptionRange)),
	    (unsigned long) (codePtr->numAuxDataItems * sizeof(AuxData)),
	    codePtr->numCmdLocBytes);
#endif /* TCL_COMPILE_STATS */

    /*
     * If the ByteCode is the compiled body of a Tcl procedure, print
     * information about that procedure. Note that we don't know the
     * procedure's name since ByteCode's can be shared among procedures.
     */

    if (codePtr->procPtr != NULL) {
	Proc *procPtr = codePtr->procPtr;
	int numCompiledLocals = procPtr->numCompiledLocals;
	fprintf(stdout,
		"  Proc 0x%x, refCt %d, args %d, compiled locals %d\n",
		(unsigned int) procPtr, procPtr->refCount, procPtr->numArgs,
		numCompiledLocals);
	if (numCompiledLocals > 0) {
	    CompiledLocal *localPtr = procPtr->firstLocalPtr;
	    for (i = 0;  i < numCompiledLocals;  i++) {
		fprintf(stdout, "      slot %d%s%s%s%s%s%s", i,
			(localPtr->flags & VAR_SCALAR) ? ", scalar" : "",
			(localPtr->flags & VAR_ARRAY) ? ", array" : "",
			(localPtr->flags & VAR_LINK) ? ", link" : "",
			(localPtr->flags & VAR_ARGUMENT) ? ", arg" : "",
			(localPtr->flags & VAR_TEMPORARY) ? ", temp" : "",
			(localPtr->flags & VAR_RESOLVED) ? ", resolved" : "");
		if (TclIsVarTemporary(localPtr)) {
		    fprintf(stdout, "\n");
		} else {
		    fprintf(stdout, ", \"%s\"\n", localPtr->name);
		}
		localPtr = localPtr->nextPtr;
	    }
	}
    }

    /*
     * Print the ExceptionRange array.
     */

    if (codePtr->numExceptRanges > 0) {
	fprintf(stdout, "  Exception ranges %d, depth %d:\n",
		codePtr->numExceptRanges, codePtr->maxExceptDepth);
	for (i = 0;  i < codePtr->numExceptRanges;  i++) {
	    ExceptionRange *rangePtr = &(codePtr->exceptArrayPtr[i]);
	    fprintf(stdout, "      %d: level %d, %s, pc %d-%d, ",
		    i, rangePtr->nestingLevel,
		    (rangePtr->type==LOOP_EXCEPTION_RANGE ? "loop" : "catch"),
		    rangePtr->codeOffset,
		    (rangePtr->codeOffset + rangePtr->numCodeBytes - 1));
	    switch (rangePtr->type) {
	    case LOOP_EXCEPTION_RANGE:
		fprintf(stdout,	"continue %d, break %d\n",
			rangePtr->continueOffset, rangePtr->breakOffset);
		break;
	    case CATCH_EXCEPTION_RANGE:
		fprintf(stdout,	"catch %d\n", rangePtr->catchOffset);
		break;
	    default:
		Tcl_Panic("TclPrintByteCodeObj: bad ExceptionRange type %d",
			rangePtr->type);
	    }
	}
    }

    /*
     * If there were no commands (e.g., an expression or an empty string was
     * compiled), just print all instructions and return.
     */

    if (numCmds == 0) {
	pc = codeStart;
	while (pc < codeLimit) {
	    fprintf(stdout, "    ");
	    pc += TclPrintInstruction(codePtr, pc);
	}
	return;
    }

    /*
     * Print table showing the code offset, source offset, and source length
     * for each command. These are encoded as a sequence of bytes.
     */

    fprintf(stdout, "  Commands %d:", numCmds);
    codeDeltaNext = codePtr->codeDeltaStart;
    codeLengthNext = codePtr->codeLengthStart;
    srcDeltaNext = codePtr->srcDeltaStart;
    srcLengthNext = codePtr->srcLengthStart;
    codeOffset = srcOffset = 0;
    for (i = 0;  i < numCmds;  i++) {
	if ((unsigned int) (*codeDeltaNext) == (unsigned int) 0xFF) {
	    codeDeltaNext++;
	    delta = TclGetInt4AtPtr(codeDeltaNext);
	    codeDeltaNext += 4;
	} else {
	    delta = TclGetInt1AtPtr(codeDeltaNext);
	    codeDeltaNext++;
	}
	codeOffset += delta;

	if ((unsigned int) (*codeLengthNext) == (unsigned int) 0xFF) {
	    codeLengthNext++;
	    codeLen = TclGetInt4AtPtr(codeLengthNext);
	    codeLengthNext += 4;
	} else {
	    codeLen = TclGetInt1AtPtr(codeLengthNext);
	    codeLengthNext++;
	}

	if ((unsigned int) (*srcDeltaNext) == (unsigned int) 0xFF) {
	    srcDeltaNext++;
	    delta = TclGetInt4AtPtr(srcDeltaNext);
	    srcDeltaNext += 4;
	} else {
	    delta = TclGetInt1AtPtr(srcDeltaNext);
	    srcDeltaNext++;
	}
	srcOffset += delta;

	if ((unsigned int) (*srcLengthNext) == (unsigned int) 0xFF) {
	    srcLengthNext++;
	    srcLen = TclGetInt4AtPtr(srcLengthNext);
	    srcLengthNext += 4;
	} else {
	    srcLen = TclGetInt1AtPtr(srcLengthNext);
	    srcLengthNext++;
	}

	fprintf(stdout,	"%s%4d: pc %d-%d, src %d-%d",
		((i % 2)? "   	" : "\n   "),
		(i+1), codeOffset, (codeOffset + codeLen - 1),
		srcOffset, (srcOffset + srcLen - 1));
    }
    if (numCmds > 0) {
	fprintf(stdout,	"\n");
    }

    /*
     * Print each instruction. If the instruction corresponds to the start of
     * a command, print the command's source. Note that we don't need the code
     * length here.
     */

    codeDeltaNext = codePtr->codeDeltaStart;
    srcDeltaNext = codePtr->srcDeltaStart;
    srcLengthNext = codePtr->srcLengthStart;
    codeOffset = srcOffset = 0;
    pc = codeStart;
    for (i = 0;  i < numCmds;  i++) {
	if ((unsigned int) (*codeDeltaNext) == (unsigned int) 0xFF) {
	    codeDeltaNext++;
	    delta = TclGetInt4AtPtr(codeDeltaNext);
	    codeDeltaNext += 4;
	} else {
	    delta = TclGetInt1AtPtr(codeDeltaNext);
	    codeDeltaNext++;
	}
	codeOffset += delta;

	if ((unsigned int) (*srcDeltaNext) == (unsigned int) 0xFF) {
	    srcDeltaNext++;
	    delta = TclGetInt4AtPtr(srcDeltaNext);
	    srcDeltaNext += 4;
	} else {
	    delta = TclGetInt1AtPtr(srcDeltaNext);
	    srcDeltaNext++;
	}
	srcOffset += delta;

	if ((unsigned int) (*srcLengthNext) == (unsigned int) 0xFF) {
	    srcLengthNext++;
	    srcLen = TclGetInt4AtPtr(srcLengthNext);
	    srcLengthNext += 4;
	} else {
	    srcLen = TclGetInt1AtPtr(srcLengthNext);
	    srcLengthNext++;
	}

	/*
	 * Print instructions before command i.
	 */

	while ((pc-codeStart) < codeOffset) {
	    fprintf(stdout, "    ");
	    pc += TclPrintInstruction(codePtr, pc);
	}

	fprintf(stdout, "  Command %d: ", (i+1));
	TclPrintSource(stdout, (codePtr->source + srcOffset),
		TclMin(srcLen, 55));
	fprintf(stdout, "\n");
    }
    if (pc < codeLimit) {
	/*
	 * Print instructions after the last command.
	 */

	while (pc < codeLimit) {
	    fprintf(stdout, "    ");
	    pc += TclPrintInstruction(codePtr, pc);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclPrintInstruction --
 *
 *	This procedure prints ("disassembles") one instruction from a bytecode
 *	object to stdout.
 *
 * Results:
 *	Returns the length in bytes of the current instruiction.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclPrintInstruction(
    ByteCode *codePtr,		/* Bytecode containing the instruction. */
    unsigned char *pc)		/* Points to first byte of instruction. */
{
    Proc *procPtr = codePtr->procPtr;
    unsigned char opCode = *pc;
    register InstructionDesc *instDesc = &tclInstructionTable[opCode];
    unsigned char *codeStart = codePtr->codeStart;
    unsigned int pcOffset = (pc - codeStart);
    int opnd, i, j, numBytes = 1;
    int localCt = procPtr ? procPtr->numCompiledLocals : 0;
    CompiledLocal *localPtr = procPtr ? procPtr->firstLocalPtr : NULL;

    char suffixBuffer[64];	/* Additional info to print after main opcode
				 * and immediates. */
    char *suffixSrc = NULL;
    Tcl_Obj *suffixObj = NULL;
    AuxData *auxPtr = NULL;

    suffixBuffer[0] = '\0';
    fprintf(stdout, "(%u) %s ", pcOffset, instDesc->name);
    for (i = 0;  i < instDesc->numOperands;  i++) {
	switch (instDesc->opTypes[i]) {
	case OPERAND_INT1:
	    opnd = TclGetInt1AtPtr(pc+numBytes); numBytes++;
	    if (opCode == INST_JUMP1 || opCode == INST_JUMP_TRUE1
		    || opCode == INST_JUMP_FALSE1) {
		sprintf(suffixBuffer, "pc %u", pcOffset+opnd);
	    }
	    fprintf(stdout, "%+d ", opnd);
	    break;
	case OPERAND_INT4:
	    opnd = TclGetInt4AtPtr(pc+numBytes); numBytes += 4;
	    if (opCode == INST_JUMP4 || opCode == INST_JUMP_TRUE4
		    || opCode == INST_JUMP_FALSE4) {
		sprintf(suffixBuffer, "pc %u", pcOffset+opnd);
	    } else if (opCode == INST_START_CMD) {
		sprintf(suffixBuffer, "next cmd at pc %u", pcOffset+opnd);
	    }
	    fprintf(stdout, "%+d ", opnd);
	    break;
	case OPERAND_UINT1:
	    opnd = TclGetUInt1AtPtr(pc+numBytes); numBytes++;
	    if (opCode == INST_PUSH1) {
		suffixObj = codePtr->objArrayPtr[opnd];
	    }
	    fprintf(stdout, "%u ", (unsigned int) opnd);
	    break;
	case OPERAND_AUX4:
	case OPERAND_UINT4:
	    opnd = TclGetUInt4AtPtr(pc+numBytes); numBytes += 4;
	    if (opCode == INST_PUSH4) {
		suffixObj = codePtr->objArrayPtr[opnd];
	    } else if (opCode == INST_START_CMD && opnd != 1) {
		sprintf(suffixBuffer, ", %u cmds start here", opnd);
	    }
	    fprintf(stdout, "%u ", (unsigned int) opnd);
	    if (instDesc->opTypes[i] == OPERAND_AUX4) {
		auxPtr = &codePtr->auxDataArrayPtr[opnd];
	    }
	    break;
	case OPERAND_IDX4:
	    opnd = TclGetInt4AtPtr(pc+numBytes); numBytes += 4;
	    if (opnd >= -1) {
		fprintf(stdout, "%d ", opnd);
	    } else if (opnd == -2) {
		fprintf(stdout, "end ");
	    } else {
		fprintf(stdout, "end-%d ", -2-opnd);
	    }
	    break;
	case OPERAND_LVT1:
	    opnd = TclGetUInt1AtPtr(pc+numBytes);
	    numBytes++;
	    goto printLVTindex;
	case OPERAND_LVT4:
	    opnd = TclGetUInt4AtPtr(pc+numBytes);
	    numBytes += 4;
	printLVTindex:
	    if (localPtr != NULL) {
		if (opnd >= localCt) {
		    Tcl_Panic("TclPrintInstruction: bad local var index %u (%u locals)",
			    (unsigned int) opnd, localCt);
		}
		for (j = 0;  j < opnd;  j++) {
		    localPtr = localPtr->nextPtr;
		}
		if (TclIsVarTemporary(localPtr)) {
		    sprintf(suffixBuffer, "temp var %u", (unsigned) opnd);
		} else {
		    sprintf(suffixBuffer, "var ");
		    suffixSrc = localPtr->name;
		}
	    }
	    fprintf(stdout, "%%v%u ", (unsigned) opnd);
	    break;
	case OPERAND_NONE:
	default:
	    break;
	}
    }
    if (suffixObj) {
	fprintf(stdout, "\t# ");
	TclPrintObject(stdout, codePtr->objArrayPtr[opnd], 40);
    } else if (suffixBuffer[0]) {
	fprintf(stdout, "\t# %s", suffixBuffer);
	if (suffixSrc) {
	    TclPrintSource(stdout, suffixSrc, 40);
	}
    }
    fprintf(stdout, "\n");
    if (auxPtr && auxPtr->type->printProc) {
	fprintf(stdout, "\t\t[");
	auxPtr->type->printProc(auxPtr->clientData, codePtr, pcOffset);
	fprintf(stdout, "]\n");
    }
    return numBytes;
}

/*
 *----------------------------------------------------------------------
 *
 * TclPrintObject --
 *
 *	This procedure prints up to a specified number of characters from the
 *	argument Tcl object's string representation to a specified file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Outputs characters to the specified file.
 *
 *----------------------------------------------------------------------
 */

void
TclPrintObject(
    FILE *outFile,		/* The file to print the source to. */
    Tcl_Obj *objPtr,		/* Points to the Tcl object whose string
				 * representation should be printed. */
    int maxChars)		/* Maximum number of chars to print. */
{
    char *bytes;
    int length;

    bytes = Tcl_GetStringFromObj(objPtr, &length);
    TclPrintSource(outFile, bytes, TclMin(length, maxChars));
}

/*
 *----------------------------------------------------------------------
 *
 * TclPrintSource --
 *
 *	This procedure prints up to a specified number of characters from the
 *	argument string to a specified file. It tries to produce legible
 *	output by adding backslashes as necessary.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Outputs characters to the specified file.
 *
 *----------------------------------------------------------------------
 */

void
TclPrintSource(
    FILE *outFile,		/* The file to print the source to. */
    const char *stringPtr,	/* The string to print. */
    int maxChars)		/* Maximum number of chars to print. */
{
    register const char *p;
    register int i = 0;

    if (stringPtr == NULL) {
	fprintf(outFile, "\"\"");
	return;
    }

    fprintf(outFile, "\"");
    p = stringPtr;
    for (;  (*p != '\0') && (i < maxChars);  p++, i++) {
	switch (*p) {
	case '"':
	    fprintf(outFile, "\\\"");
	    continue;
	case '\f':
	    fprintf(outFile, "\\f");
	    continue;
	case '\n':
	    fprintf(outFile, "\\n");
	    continue;
	case '\r':
	    fprintf(outFile, "\\r");
	    continue;
	case '\t':
	    fprintf(outFile, "\\t");
	    continue;
	case '\v':
	    fprintf(outFile, "\\v");
	    continue;
	default:
	    fprintf(outFile, "%c", *p);
	    continue;
	}
    }
    fprintf(outFile, "\"");
}
#endif /* TCL_COMPILE_DEBUG */

#ifdef TCL_COMPILE_STATS
/*
 *----------------------------------------------------------------------
 *
 * RecordByteCodeStats --
 *
 *	Accumulates various compilation-related statistics for each newly
 *	compiled ByteCode. Called by the TclInitByteCodeObj when Tcl is
 *	compiled with the -DTCL_COMPILE_STATS flag
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Accumulates aggregate code-related statistics in the interpreter's
 *	ByteCodeStats structure. Records statistics specific to a ByteCode in
 *	its ByteCode structure.
 *
 *----------------------------------------------------------------------
 */

void
RecordByteCodeStats(
    ByteCode *codePtr)		/* Points to ByteCode structure with info
				 * to add to accumulated statistics. */
{
    Interp *iPtr = (Interp *) *codePtr->interpHandle;
    register ByteCodeStats *statsPtr = &(iPtr->stats);

    statsPtr->numCompilations++;
    statsPtr->totalSrcBytes += (double) codePtr->numSrcBytes;
    statsPtr->totalByteCodeBytes += (double) codePtr->structureSize;
    statsPtr->currentSrcBytes += (double) codePtr->numSrcBytes;
    statsPtr->currentByteCodeBytes += (double) codePtr->structureSize;

    statsPtr->srcCount[TclLog2(codePtr->numSrcBytes)]++;
    statsPtr->byteCodeCount[TclLog2((int)(codePtr->structureSize))]++;

    statsPtr->currentInstBytes += (double) codePtr->numCodeBytes;
    statsPtr->currentLitBytes += (double)
	    codePtr->numLitObjects * sizeof(Tcl_Obj *);
    statsPtr->currentExceptBytes += (double)
	    codePtr->numExceptRanges * sizeof(ExceptionRange);
    statsPtr->currentAuxBytes += (double)
	    codePtr->numAuxDataItems * sizeof(AuxData);
    statsPtr->currentCmdMapBytes += (double) codePtr->numCmdLocBytes;
}
#endif /* TCL_COMPILE_STATS */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */