summaryrefslogtreecommitdiffstats
path: root/js/src/jsapi.h
blob: 76781cf0650124781ff518a11826ee490c36ba23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* JavaScript API. */

#ifndef jsapi_h
#define jsapi_h

#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Range.h"
#include "mozilla/RangedPtr.h"
#include "mozilla/RefCounted.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Variant.h"

#include <iterator>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>

#include "jsalloc.h"
#include "jspubtd.h"

#include "js/CallArgs.h"
#include "js/CharacterEncoding.h"
#include "js/Class.h"
#include "js/GCVector.h"
#include "js/HashTable.h"
#include "js/Id.h"
#include "js/Principals.h"
#include "js/Realm.h"
#include "js/RootingAPI.h"
#include "js/TracingAPI.h"
#include "js/UniquePtr.h"
#include "js/Utility.h"
#include "js/Value.h"
#include "js/Vector.h"

/************************************************************************/

namespace JS {

class TwoByteChars;

#ifdef JS_DEBUG

class JS_PUBLIC_API(AutoCheckRequestDepth)
{
    JSContext* cx;
  public:
    explicit AutoCheckRequestDepth(JSContext* cx);
    explicit AutoCheckRequestDepth(js::ContextFriendFields* cx);
    ~AutoCheckRequestDepth();
};

# define CHECK_REQUEST(cx) \
    JS::AutoCheckRequestDepth _autoCheckRequestDepth(cx)

#else

# define CHECK_REQUEST(cx) \
    ((void) 0)

#endif /* JS_DEBUG */

/** AutoValueArray roots an internal fixed-size array of Values. */
template <size_t N>
class MOZ_RAII AutoValueArray : public AutoGCRooter
{
    const size_t length_;
    Value elements_[N];

  public:
    explicit AutoValueArray(JSContext* cx
                            MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, VALARRAY), length_(N)
    {
        /* Always initialize in case we GC before assignment. */
        mozilla::PodArrayZero(elements_);
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    unsigned length() const { return length_; }
    const Value* begin() const { return elements_; }
    Value* begin() { return elements_; }

    HandleValue operator[](unsigned i) const {
        MOZ_ASSERT(i < N);
        return HandleValue::fromMarkedLocation(&elements_[i]);
    }
    MutableHandleValue operator[](unsigned i) {
        MOZ_ASSERT(i < N);
        return MutableHandleValue::fromMarkedLocation(&elements_[i]);
    }

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

template<class T>
class MOZ_RAII AutoVectorRooterBase : protected AutoGCRooter
{
    typedef js::Vector<T, 8> VectorImpl;
    VectorImpl vector;

  public:
    explicit AutoVectorRooterBase(JSContext* cx, ptrdiff_t tag
                              MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, tag), vector(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    explicit AutoVectorRooterBase(js::ContextFriendFields* cx, ptrdiff_t tag
                              MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, tag), vector(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    typedef T ElementType;
    typedef typename VectorImpl::Range Range;

    size_t length() const { return vector.length(); }
    bool empty() const { return vector.empty(); }

    MOZ_MUST_USE bool append(const T& v) { return vector.append(v); }
    MOZ_MUST_USE bool appendN(const T& v, size_t len) { return vector.appendN(v, len); }
    MOZ_MUST_USE bool append(const T* ptr, size_t len) { return vector.append(ptr, len); }
    MOZ_MUST_USE bool appendAll(const AutoVectorRooterBase<T>& other) {
        return vector.appendAll(other.vector);
    }

    MOZ_MUST_USE bool insert(T* p, const T& val) { return vector.insert(p, val); }

    /* For use when space has already been reserved. */
    void infallibleAppend(const T& v) { vector.infallibleAppend(v); }

    void popBack() { vector.popBack(); }
    T popCopy() { return vector.popCopy(); }

    MOZ_MUST_USE bool growBy(size_t inc) {
        size_t oldLength = vector.length();
        if (!vector.growByUninitialized(inc))
            return false;
        makeRangeGCSafe(oldLength);
        return true;
    }

    MOZ_MUST_USE bool resize(size_t newLength) {
        size_t oldLength = vector.length();
        if (newLength <= oldLength) {
            vector.shrinkBy(oldLength - newLength);
            return true;
        }
        if (!vector.growByUninitialized(newLength - oldLength))
            return false;
        makeRangeGCSafe(oldLength);
        return true;
    }

    void clear() { vector.clear(); }

    MOZ_MUST_USE bool reserve(size_t newLength) {
        return vector.reserve(newLength);
    }

    JS::MutableHandle<T> operator[](size_t i) {
        return JS::MutableHandle<T>::fromMarkedLocation(&vector[i]);
    }
    JS::Handle<T> operator[](size_t i) const {
        return JS::Handle<T>::fromMarkedLocation(&vector[i]);
    }

    const T* begin() const { return vector.begin(); }
    T* begin() { return vector.begin(); }

    const T* end() const { return vector.end(); }
    T* end() { return vector.end(); }

    Range all() { return vector.all(); }

    const T& back() const { return vector.back(); }

    friend void AutoGCRooter::trace(JSTracer* trc);

  private:
    void makeRangeGCSafe(size_t oldLength) {
        T* t = vector.begin() + oldLength;
        for (size_t i = oldLength; i < vector.length(); ++i, ++t)
            memset(t, 0, sizeof(T));
    }

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

template <typename T>
class MOZ_RAII AutoVectorRooter : public AutoVectorRooterBase<T>
{
  public:
    explicit AutoVectorRooter(JSContext* cx
                             MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
        : AutoVectorRooterBase<T>(cx, this->GetTag(T()))
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    explicit AutoVectorRooter(js::ContextFriendFields* cx
                             MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
        : AutoVectorRooterBase<T>(cx, this->GetTag(T()))
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

class AutoValueVector : public Rooted<GCVector<Value, 8>> {
    using Vec = GCVector<Value, 8>;
    using Base = Rooted<Vec>;
  public:
    explicit AutoValueVector(JSContext* cx) : Base(cx, Vec(cx)) {}
    explicit AutoValueVector(js::ContextFriendFields* cx) : Base(cx, Vec(cx)) {}
};

class AutoIdVector : public Rooted<GCVector<jsid, 8>> {
    using Vec = GCVector<jsid, 8>;
    using Base = Rooted<Vec>;
  public:
    explicit AutoIdVector(JSContext* cx) : Base(cx, Vec(cx)) {}
    explicit AutoIdVector(js::ContextFriendFields* cx) : Base(cx, Vec(cx)) {}

    bool appendAll(const AutoIdVector& other) { return this->Base::appendAll(other.get()); }
};

class AutoObjectVector : public Rooted<GCVector<JSObject*, 8>> {
    using Vec = GCVector<JSObject*, 8>;
    using Base = Rooted<Vec>;
  public:
    explicit AutoObjectVector(JSContext* cx) : Base(cx, Vec(cx)) {}
    explicit AutoObjectVector(js::ContextFriendFields* cx) : Base(cx, Vec(cx)) {}
};

using ValueVector = JS::GCVector<JS::Value>;
using IdVector = JS::GCVector<jsid>;
using ScriptVector = JS::GCVector<JSScript*>;
using StringVector = JS::GCVector<JSString*>;

template<class Key, class Value>
class MOZ_RAII AutoHashMapRooter : protected AutoGCRooter
{
  private:
    typedef js::HashMap<Key, Value> HashMapImpl;

  public:
    explicit AutoHashMapRooter(JSContext* cx, ptrdiff_t tag
                               MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, tag), map(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    typedef Key KeyType;
    typedef Value ValueType;
    typedef typename HashMapImpl::Entry Entry;
    typedef typename HashMapImpl::Lookup Lookup;
    typedef typename HashMapImpl::Ptr Ptr;
    typedef typename HashMapImpl::AddPtr AddPtr;

    bool init(uint32_t len = 16) {
        return map.init(len);
    }
    bool initialized() const {
        return map.initialized();
    }
    Ptr lookup(const Lookup& l) const {
        return map.lookup(l);
    }
    void remove(Ptr p) {
        map.remove(p);
    }
    AddPtr lookupForAdd(const Lookup& l) const {
        return map.lookupForAdd(l);
    }

    template<typename KeyInput, typename ValueInput>
    bool add(AddPtr& p, const KeyInput& k, const ValueInput& v) {
        return map.add(p, k, v);
    }

    bool add(AddPtr& p, const Key& k) {
        return map.add(p, k);
    }

    template<typename KeyInput, typename ValueInput>
    bool relookupOrAdd(AddPtr& p, const KeyInput& k, const ValueInput& v) {
        return map.relookupOrAdd(p, k, v);
    }

    typedef typename HashMapImpl::Range Range;
    Range all() const {
        return map.all();
    }

    typedef typename HashMapImpl::Enum Enum;

    void clear() {
        map.clear();
    }

    void finish() {
        map.finish();
    }

    bool empty() const {
        return map.empty();
    }

    uint32_t count() const {
        return map.count();
    }

    size_t capacity() const {
        return map.capacity();
    }

    size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
        return map.sizeOfExcludingThis(mallocSizeOf);
    }
    size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
        return map.sizeOfIncludingThis(mallocSizeOf);
    }

    /************************************************** Shorthand operations */

    bool has(const Lookup& l) const {
        return map.has(l);
    }

    template<typename KeyInput, typename ValueInput>
    bool put(const KeyInput& k, const ValueInput& v) {
        return map.put(k, v);
    }

    template<typename KeyInput, typename ValueInput>
    bool putNew(const KeyInput& k, const ValueInput& v) {
        return map.putNew(k, v);
    }

    Ptr lookupWithDefault(const Key& k, const Value& defaultValue) {
        return map.lookupWithDefault(k, defaultValue);
    }

    void remove(const Lookup& l) {
        map.remove(l);
    }

    friend void AutoGCRooter::trace(JSTracer* trc);

  private:
    AutoHashMapRooter(const AutoHashMapRooter& hmr) = delete;
    AutoHashMapRooter& operator=(const AutoHashMapRooter& hmr) = delete;

    HashMapImpl map;

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

template<class T>
class MOZ_RAII AutoHashSetRooter : protected AutoGCRooter
{
  private:
    typedef js::HashSet<T> HashSetImpl;

  public:
    explicit AutoHashSetRooter(JSContext* cx, ptrdiff_t tag
                               MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, tag), set(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    typedef typename HashSetImpl::Lookup Lookup;
    typedef typename HashSetImpl::Ptr Ptr;
    typedef typename HashSetImpl::AddPtr AddPtr;

    bool init(uint32_t len = 16) {
        return set.init(len);
    }
    bool initialized() const {
        return set.initialized();
    }
    Ptr lookup(const Lookup& l) const {
        return set.lookup(l);
    }
    void remove(Ptr p) {
        set.remove(p);
    }
    AddPtr lookupForAdd(const Lookup& l) const {
        return set.lookupForAdd(l);
    }

    bool add(AddPtr& p, const T& t) {
        return set.add(p, t);
    }

    bool relookupOrAdd(AddPtr& p, const Lookup& l, const T& t) {
        return set.relookupOrAdd(p, l, t);
    }

    typedef typename HashSetImpl::Range Range;
    Range all() const {
        return set.all();
    }

    typedef typename HashSetImpl::Enum Enum;

    void clear() {
        set.clear();
    }

    void finish() {
        set.finish();
    }

    bool empty() const {
        return set.empty();
    }

    uint32_t count() const {
        return set.count();
    }

    size_t capacity() const {
        return set.capacity();
    }

    size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
        return set.sizeOfExcludingThis(mallocSizeOf);
    }
    size_t sizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
        return set.sizeOfIncludingThis(mallocSizeOf);
    }

    /************************************************** Shorthand operations */

    bool has(const Lookup& l) const {
        return set.has(l);
    }

    bool put(const T& t) {
        return set.put(t);
    }

    bool putNew(const T& t) {
        return set.putNew(t);
    }

    void remove(const Lookup& l) {
        set.remove(l);
    }

    friend void AutoGCRooter::trace(JSTracer* trc);

  private:
    AutoHashSetRooter(const AutoHashSetRooter& hmr) = delete;
    AutoHashSetRooter& operator=(const AutoHashSetRooter& hmr) = delete;

    HashSetImpl set;

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

/**
 * Custom rooting behavior for internal and external clients.
 */
class MOZ_RAII JS_PUBLIC_API(CustomAutoRooter) : private AutoGCRooter
{
  public:
    template <typename CX>
    explicit CustomAutoRooter(const CX& cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : AutoGCRooter(cx, CUSTOM)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    friend void AutoGCRooter::trace(JSTracer* trc);

  protected:
    virtual ~CustomAutoRooter() {}

    /** Supplied by derived class to trace roots. */
    virtual void trace(JSTracer* trc) = 0;

  private:
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

/** A handle to an array of rooted values. */
class HandleValueArray
{
    const size_t length_;
    const Value * const elements_;

    HandleValueArray(size_t len, const Value* elements) : length_(len), elements_(elements) {}

  public:
    explicit HandleValueArray(const RootedValue& value) : length_(1), elements_(value.address()) {}

    MOZ_IMPLICIT HandleValueArray(const AutoValueVector& values)
      : length_(values.length()), elements_(values.begin()) {}

    template <size_t N>
    MOZ_IMPLICIT HandleValueArray(const AutoValueArray<N>& values) : length_(N), elements_(values.begin()) {}

    /** CallArgs must already be rooted somewhere up the stack. */
    MOZ_IMPLICIT HandleValueArray(const JS::CallArgs& args) : length_(args.length()), elements_(args.array()) {}

    /** Use with care! Only call this if the data is guaranteed to be marked. */
    static HandleValueArray fromMarkedLocation(size_t len, const Value* elements) {
        return HandleValueArray(len, elements);
    }

    static HandleValueArray subarray(const HandleValueArray& values, size_t startIndex, size_t len) {
        MOZ_ASSERT(startIndex + len <= values.length());
        return HandleValueArray(len, values.begin() + startIndex);
    }

    static HandleValueArray empty() {
        return HandleValueArray(0, nullptr);
    }

    size_t length() const { return length_; }
    const Value* begin() const { return elements_; }

    HandleValue operator[](size_t i) const {
        MOZ_ASSERT(i < length_);
        return HandleValue::fromMarkedLocation(&elements_[i]);
    }
};

}  /* namespace JS */

/************************************************************************/

struct JSFreeOp {
  protected:
    JSRuntime*  runtime_;

    explicit JSFreeOp(JSRuntime* rt)
      : runtime_(rt) { }

  public:
    JSRuntime* runtime() const {
        MOZ_ASSERT(runtime_);
        return runtime_;
    }
};

/* Callbacks and their arguments. */

/************************************************************************/

typedef enum JSGCStatus {
    JSGC_BEGIN,
    JSGC_END
} JSGCStatus;

typedef void
(* JSGCCallback)(JSContext* cx, JSGCStatus status, void* data);

typedef void
(* JSObjectsTenuredCallback)(JSContext* cx, void* data);

typedef enum JSFinalizeStatus {
    /**
     * Called when preparing to sweep a group of zones, before anything has been
     * swept.  The collector will not yield to the mutator before calling the
     * callback with JSFINALIZE_GROUP_END status.
     */
    JSFINALIZE_GROUP_START,

    /**
     * Called when preparing to sweep a group of zones. Weak references to
     * unmarked things have been removed and things that are not swept
     * incrementally have been finalized at this point.  The collector may yield
     * to the mutator after this point.
     */
    JSFINALIZE_GROUP_END,

    /**
     * Called at the end of collection when everything has been swept.
     */
    JSFINALIZE_COLLECTION_END
} JSFinalizeStatus;

typedef void
(* JSFinalizeCallback)(JSFreeOp* fop, JSFinalizeStatus status, bool isZoneGC, void* data);

typedef void
(* JSWeakPointerZoneGroupCallback)(JSContext* cx, void* data);

typedef void
(* JSWeakPointerCompartmentCallback)(JSContext* cx, JSCompartment* comp, void* data);

typedef bool
(* JSInterruptCallback)(JSContext* cx);

typedef JSObject*
(* JSGetIncumbentGlobalCallback)(JSContext* cx);

typedef bool
(* JSEnqueuePromiseJobCallback)(JSContext* cx, JS::HandleObject job,
                                JS::HandleObject allocationSite, JS::HandleObject incumbentGlobal,
                                void* data);

enum class PromiseRejectionHandlingState {
    Unhandled,
    Handled
};

typedef void
(* JSPromiseRejectionTrackerCallback)(JSContext* cx, JS::HandleObject promise,
                                      PromiseRejectionHandlingState state, void* data);

typedef void
(* JSProcessPromiseCallback)(JSContext* cx, JS::HandleObject promise);

/**
 * Possible exception types. These types are part of a JSErrorFormatString
 * structure. They define which error to throw in case of a runtime error.
 *
 * JSEXN_WARN is used for warnings in js.msg files (for instance because we
 * don't want to prepend 'Error:' to warning messages). This value can go away
 * if we ever decide to use an entirely separate mechanism for warnings.
 */
typedef enum JSExnType {
    JSEXN_ERR,
    JSEXN_FIRST = JSEXN_ERR,
        JSEXN_INTERNALERR,
        JSEXN_EVALERR,
        JSEXN_RANGEERR,
        JSEXN_REFERENCEERR,
        JSEXN_SYNTAXERR,
        JSEXN_TYPEERR,
        JSEXN_URIERR,
        JSEXN_DEBUGGEEWOULDRUN,
        JSEXN_WASMCOMPILEERROR,
        JSEXN_WASMRUNTIMEERROR,
    JSEXN_ERROR_LIMIT,
    JSEXN_WARN = JSEXN_ERROR_LIMIT,
    JSEXN_NOTE,
    JSEXN_LIMIT
} JSExnType;

typedef struct JSErrorFormatString {
     /** The error message name in ASCII. */
    const char* name;

    /** The error format string in ASCII. */
    const char* format;

    /** The number of arguments to expand in the formatted error message. */
    uint16_t argCount;

    /** One of the JSExnType constants above. */
    int16_t exnType;
} JSErrorFormatString;

typedef const JSErrorFormatString*
(* JSErrorCallback)(void* userRef, const unsigned errorNumber);

typedef bool
(* JSLocaleToUpperCase)(JSContext* cx, JS::HandleString src, JS::MutableHandleValue rval);

typedef bool
(* JSLocaleToLowerCase)(JSContext* cx, JS::HandleString src, JS::MutableHandleValue rval);

typedef bool
(* JSLocaleCompare)(JSContext* cx, JS::HandleString src1, JS::HandleString src2,
                    JS::MutableHandleValue rval);

typedef bool
(* JSLocaleToUnicode)(JSContext* cx, const char* src, JS::MutableHandleValue rval);

/**
 * Callback used to ask the embedding for the cross compartment wrapper handler
 * that implements the desired prolicy for this kind of object in the
 * destination compartment. |obj| is the object to be wrapped. If |existing| is
 * non-nullptr, it will point to an existing wrapper object that should be
 * re-used if possible. |existing| is guaranteed to be a cross-compartment
 * wrapper with a lazily-defined prototype and the correct global. It is
 * guaranteed not to wrap a function.
 */
typedef JSObject*
(* JSWrapObjectCallback)(JSContext* cx, JS::HandleObject existing, JS::HandleObject obj);

/**
 * Callback used by the wrap hook to ask the embedding to prepare an object
 * for wrapping in a context. This might include unwrapping other wrappers
 * or even finding a more suitable object for the new compartment.
 */
typedef void
(* JSPreWrapCallback)(JSContext* cx, JS::HandleObject scope, JS::HandleObject obj,
                      JS::HandleObject objectPassedToWrap,
                      JS::MutableHandleObject retObj);

struct JSWrapObjectCallbacks
{
    JSWrapObjectCallback wrap;
    JSPreWrapCallback preWrap;
};

typedef void
(* JSDestroyCompartmentCallback)(JSFreeOp* fop, JSCompartment* compartment);

typedef size_t
(* JSSizeOfIncludingThisCompartmentCallback)(mozilla::MallocSizeOf mallocSizeOf,
                                             JSCompartment* compartment);

typedef void
(* JSZoneCallback)(JS::Zone* zone);

typedef void
(* JSCompartmentNameCallback)(JSContext* cx, JSCompartment* compartment,
                              char* buf, size_t bufsize);

/************************************************************************/

static MOZ_ALWAYS_INLINE JS::Value
JS_NumberValue(double d)
{
    int32_t i;
    d = JS::CanonicalizeNaN(d);
    if (mozilla::NumberIsInt32(d, &i))
        return JS::Int32Value(i);
    return JS::DoubleValue(d);
}

/************************************************************************/

JS_PUBLIC_API(bool)
JS_StringHasBeenPinned(JSContext* cx, JSString* str);

namespace JS {

/**
 * Container class for passing in script source buffers to the JS engine.  This
 * not only groups the buffer and length values, it also provides a way to
 * optionally pass ownership of the buffer to the JS engine without copying.
 * Rules for use:
 *
 *  1) The data array must be allocated with js_malloc() or js_realloc() if
 *     ownership is being granted to the SourceBufferHolder.
 *  2) If ownership is not given to the SourceBufferHolder, then the memory
 *     must be kept alive until the JS compilation is complete.
 *  3) Any code calling SourceBufferHolder::take() must guarantee to keep the
 *     memory alive until JS compilation completes.  Normally only the JS
 *     engine should be calling take().
 *
 * Example use:
 *
 *    size_t length = 512;
 *    char16_t* chars = static_cast<char16_t*>(js_malloc(sizeof(char16_t) * length));
 *    JS::SourceBufferHolder srcBuf(chars, length, JS::SourceBufferHolder::GiveOwnership);
 *    JS::Compile(cx, options, srcBuf);
 */
class MOZ_STACK_CLASS SourceBufferHolder final
{
  public:
    enum Ownership {
      NoOwnership,
      GiveOwnership
    };

    SourceBufferHolder(const char16_t* data, size_t dataLength, Ownership ownership)
      : data_(data),
        length_(dataLength),
        ownsChars_(ownership == GiveOwnership)
    {
        // Ensure that null buffers properly return an unowned, empty,
        // null-terminated string.
        static const char16_t NullChar_ = 0;
        if (!get()) {
            data_ = &NullChar_;
            length_ = 0;
            ownsChars_ = false;
        }
    }

    SourceBufferHolder(SourceBufferHolder&& other)
      : data_(other.data_),
        length_(other.length_),
        ownsChars_(other.ownsChars_)
    {
        other.data_ = nullptr;
        other.length_ = 0;
        other.ownsChars_ = false;
    }

    ~SourceBufferHolder() {
        if (ownsChars_)
            js_free(const_cast<char16_t*>(data_));
    }

    // Access the underlying source buffer without affecting ownership.
    const char16_t* get() const { return data_; }

    // Length of the source buffer in char16_t code units (not bytes)
    size_t length() const { return length_; }

    // Returns true if the SourceBufferHolder owns the buffer and will free
    // it upon destruction.  If true, it is legal to call take().
    bool ownsChars() const { return ownsChars_; }

    // Retrieve and take ownership of the underlying data buffer.  The caller
    // is now responsible for calling js_free() on the returned value, *but only
    // after JS script compilation has completed*.
    //
    // After the buffer has been taken the SourceBufferHolder functions as if
    // it had been constructed on an unowned buffer;  get() and length() still
    // work.  In order for this to be safe the taken buffer must be kept alive
    // until after JS script compilation completes as noted above.
    //
    // Note, it's the caller's responsibility to check ownsChars() before taking
    // the buffer.  Taking and then free'ing an unowned buffer will have dire
    // consequences.
    char16_t* take() {
        MOZ_ASSERT(ownsChars_);
        ownsChars_ = false;
        return const_cast<char16_t*>(data_);
    }

  private:
    SourceBufferHolder(SourceBufferHolder&) = delete;
    SourceBufferHolder& operator=(SourceBufferHolder&) = delete;

    const char16_t* data_;
    size_t length_;
    bool ownsChars_;
};

} /* namespace JS */

/************************************************************************/

/* Property attributes, set in JSPropertySpec and passed to API functions.
 *
 * NB: The data structure in which some of these values are stored only uses
 *     a uint8_t to store the relevant information. Proceed with caution if
 *     trying to reorder or change the the first byte worth of flags.
 */
#define JSPROP_ENUMERATE        0x01    /* property is visible to for/in loop */
#define JSPROP_READONLY         0x02    /* not settable: assignment is no-op.
                                           This flag is only valid when neither
                                           JSPROP_GETTER nor JSPROP_SETTER is
                                           set. */
#define JSPROP_PERMANENT        0x04    /* property cannot be deleted */
#define JSPROP_PROPOP_ACCESSORS 0x08    /* Passed to JS_Define(UC)Property* and
                                           JS_DefineElement if getters/setters
                                           are JSGetterOp/JSSetterOp */
#define JSPROP_GETTER           0x10    /* property holds getter function */
#define JSPROP_SETTER           0x20    /* property holds setter function */
#define JSPROP_SHARED           0x40    /* don't allocate a value slot for this
                                           property; don't copy the property on
                                           set of the same-named property in an
                                           object that delegates to a prototype
                                           containing this property */
#define JSPROP_INTERNAL_USE_BIT 0x80    /* internal JS engine use only */
#define JSFUN_STUB_GSOPS       0x200    /* use JS_PropertyStub getter/setter
                                           instead of defaulting to class gsops
                                           for property holding function */

#define JSFUN_CONSTRUCTOR      0x400    /* native that can be called as a ctor */

#define JSFUN_FLAGS_MASK       0x600    /* | of all the JSFUN_* flags */

/*
 * If set, will allow redefining a non-configurable property, but only on a
 * non-DOM global.  This is a temporary hack that will need to go away in bug
 * 1105518.
 */
#define JSPROP_REDEFINE_NONCONFIGURABLE 0x1000

/*
 * Resolve hooks and enumerate hooks must pass this flag when calling
 * JS_Define* APIs to reify lazily-defined properties.
 *
 * JSPROP_RESOLVING is used only with property-defining APIs. It tells the
 * engine to skip the resolve hook when performing the lookup at the beginning
 * of property definition. This keeps the resolve hook from accidentally
 * triggering itself: unchecked recursion.
 *
 * For enumerate hooks, triggering the resolve hook would be merely silly, not
 * fatal, except in some cases involving non-configurable properties.
 */
#define JSPROP_RESOLVING         0x2000

#define JSPROP_IGNORE_ENUMERATE  0x4000  /* ignore the value in JSPROP_ENUMERATE.
                                            This flag only valid when defining over
                                            an existing property. */
#define JSPROP_IGNORE_READONLY   0x8000  /* ignore the value in JSPROP_READONLY.
                                            This flag only valid when defining over
                                            an existing property. */
#define JSPROP_IGNORE_PERMANENT 0x10000  /* ignore the value in JSPROP_PERMANENT.
                                            This flag only valid when defining over
                                            an existing property. */
#define JSPROP_IGNORE_VALUE     0x20000  /* ignore the Value in the descriptor. Nothing was
                                            specified when passed to Object.defineProperty
                                            from script. */

/** Microseconds since the epoch, midnight, January 1, 1970 UTC. */
extern JS_PUBLIC_API(int64_t)
JS_Now(void);

/** Don't want to export data, so provide accessors for non-inline Values. */
extern JS_PUBLIC_API(JS::Value)
JS_GetNaNValue(JSContext* cx);

extern JS_PUBLIC_API(JS::Value)
JS_GetNegativeInfinityValue(JSContext* cx);

extern JS_PUBLIC_API(JS::Value)
JS_GetPositiveInfinityValue(JSContext* cx);

extern JS_PUBLIC_API(JS::Value)
JS_GetEmptyStringValue(JSContext* cx);

extern JS_PUBLIC_API(JSString*)
JS_GetEmptyString(JSContext* cx);

extern JS_PUBLIC_API(bool)
JS_ValueToObject(JSContext* cx, JS::HandleValue v, JS::MutableHandleObject objp);

extern JS_PUBLIC_API(JSFunction*)
JS_ValueToFunction(JSContext* cx, JS::HandleValue v);

extern JS_PUBLIC_API(JSFunction*)
JS_ValueToConstructor(JSContext* cx, JS::HandleValue v);

extern JS_PUBLIC_API(JSString*)
JS_ValueToSource(JSContext* cx, JS::Handle<JS::Value> v);

extern JS_PUBLIC_API(bool)
JS_DoubleIsInt32(double d, int32_t* ip);

extern JS_PUBLIC_API(JSType)
JS_TypeOfValue(JSContext* cx, JS::Handle<JS::Value> v);

namespace JS {

extern JS_PUBLIC_API(const char*)
InformalValueTypeName(const JS::Value& v);

} /* namespace JS */

extern JS_PUBLIC_API(bool)
JS_StrictlyEqual(JSContext* cx, JS::Handle<JS::Value> v1, JS::Handle<JS::Value> v2, bool* equal);

extern JS_PUBLIC_API(bool)
JS_LooselyEqual(JSContext* cx, JS::Handle<JS::Value> v1, JS::Handle<JS::Value> v2, bool* equal);

extern JS_PUBLIC_API(bool)
JS_SameValue(JSContext* cx, JS::Handle<JS::Value> v1, JS::Handle<JS::Value> v2, bool* same);

/** True iff fun is the global eval function. */
extern JS_PUBLIC_API(bool)
JS_IsBuiltinEvalFunction(JSFunction* fun);

/** True iff fun is the Function constructor. */
extern JS_PUBLIC_API(bool)
JS_IsBuiltinFunctionConstructor(JSFunction* fun);

/************************************************************************/

/*
 * Locking, contexts, and memory allocation.
 *
 * It is important that SpiderMonkey be initialized, and the first context
 * be created, in a single-threaded fashion.  Otherwise the behavior of the
 * library is undefined.
 * See: http://developer.mozilla.org/en/docs/Category:JSAPI_Reference
 */

extern JS_PUBLIC_API(JSContext*)
JS_NewContext(uint32_t maxbytes,
              uint32_t maxNurseryBytes = JS::DefaultNurseryBytes,
              JSContext* parentContext = nullptr);

extern JS_PUBLIC_API(void)
JS_DestroyContext(JSContext* cx);

typedef double (*JS_CurrentEmbedderTimeFunction)();

/**
 * The embedding can specify a time function that will be used in some
 * situations.  The function can return the time however it likes; but
 * the norm is to return times in units of milliseconds since an
 * arbitrary, but consistent, epoch.  If the time function is not set,
 * a built-in default will be used.
 */
JS_PUBLIC_API(void)
JS_SetCurrentEmbedderTimeFunction(JS_CurrentEmbedderTimeFunction timeFn);

/**
 * Return the time as computed using the current time function, or a
 * suitable default if one has not been set.
 */
JS_PUBLIC_API(double)
JS_GetCurrentEmbedderTime();

JS_PUBLIC_API(void*)
JS_GetContextPrivate(JSContext* cx);

JS_PUBLIC_API(void)
JS_SetContextPrivate(JSContext* cx, void* data);

extern JS_PUBLIC_API(JSContext*)
JS_GetParentContext(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_BeginRequest(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_EndRequest(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_SetFutexCanWait(JSContext* cx);

namespace js {

void
AssertHeapIsIdle(JSRuntime* rt);

} /* namespace js */

class MOZ_RAII JSAutoRequest
{
  public:
    explicit JSAutoRequest(JSContext* cx
                           MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : mContext(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
        JS_BeginRequest(mContext);
    }
    ~JSAutoRequest() {
        JS_EndRequest(mContext);
    }

  protected:
    JSContext* mContext;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER

#if 0
  private:
    static void* operator new(size_t) CPP_THROW_NEW { return 0; }
    static void operator delete(void*, size_t) { }
#endif
};

extern JS_PUBLIC_API(JSVersion)
JS_GetVersion(JSContext* cx);

/**
 * Mutate the version on the compartment. This is generally discouraged, but
 * necessary to support the version mutation in the js and xpc shell command
 * set.
 *
 * It would be nice to put this in jsfriendapi, but the linkage requirements
 * of the shells make that impossible.
 */
JS_PUBLIC_API(void)
JS_SetVersionForCompartment(JSCompartment* compartment, JSVersion version);

extern JS_PUBLIC_API(const char*)
JS_VersionToString(JSVersion version);

extern JS_PUBLIC_API(JSVersion)
JS_StringToVersion(const char* string);

namespace JS {

class JS_PUBLIC_API(ContextOptions) {
  public:
    ContextOptions()
      : baseline_(true),
        ion_(true),
        asmJS_(true),
        wasm_(false),
        wasmAlwaysBaseline_(false),
        throwOnAsmJSValidationFailure_(false),
        nativeRegExp_(true),
        unboxedArrays_(false),
        asyncStack_(true),
        throwOnDebuggeeWouldRun_(true),
        dumpStackOnDebuggeeWouldRun_(false),
        werror_(false),
        strictMode_(false),
        extraWarnings_(false),
        arrayProtoValues_(true)
    {
    }

    bool baseline() const { return baseline_; }
    ContextOptions& setBaseline(bool flag) {
        baseline_ = flag;
        return *this;
    }
    ContextOptions& toggleBaseline() {
        baseline_ = !baseline_;
        return *this;
    }

    bool ion() const { return ion_; }
    ContextOptions& setIon(bool flag) {
        ion_ = flag;
        return *this;
    }
    ContextOptions& toggleIon() {
        ion_ = !ion_;
        return *this;
    }

    bool asmJS() const { return asmJS_; }
    ContextOptions& setAsmJS(bool flag) {
        asmJS_ = flag;
        return *this;
    }
    ContextOptions& toggleAsmJS() {
        asmJS_ = !asmJS_;
        return *this;
    }

    bool wasm() const { return wasm_; }
    ContextOptions& setWasm(bool flag) {
        wasm_ = flag;
        return *this;
    }
    ContextOptions& toggleWasm() {
        wasm_ = !wasm_;
        return *this;
    }

    bool wasmAlwaysBaseline() const { return wasmAlwaysBaseline_; }
    ContextOptions& setWasmAlwaysBaseline(bool flag) {
        wasmAlwaysBaseline_ = flag;
        return *this;
    }
    ContextOptions& toggleWasmAlwaysBaseline() {
        wasmAlwaysBaseline_ = !wasmAlwaysBaseline_;
        return *this;
    }

    bool throwOnAsmJSValidationFailure() const { return throwOnAsmJSValidationFailure_; }
    ContextOptions& setThrowOnAsmJSValidationFailure(bool flag) {
        throwOnAsmJSValidationFailure_ = flag;
        return *this;
    }
    ContextOptions& toggleThrowOnAsmJSValidationFailure() {
        throwOnAsmJSValidationFailure_ = !throwOnAsmJSValidationFailure_;
        return *this;
    }

    bool nativeRegExp() const { return nativeRegExp_; }
    ContextOptions& setNativeRegExp(bool flag) {
        nativeRegExp_ = flag;
        return *this;
    }

    bool unboxedArrays() const { return unboxedArrays_; }
    ContextOptions& setUnboxedArrays(bool flag) {
        unboxedArrays_ = flag;
        return *this;
    }

    bool asyncStack() const { return asyncStack_; }
    ContextOptions& setAsyncStack(bool flag) {
        asyncStack_ = flag;
        return *this;
    }

    bool throwOnDebuggeeWouldRun() const { return throwOnDebuggeeWouldRun_; }
    ContextOptions& setThrowOnDebuggeeWouldRun(bool flag) {
        throwOnDebuggeeWouldRun_ = flag;
        return *this;
    }

    bool dumpStackOnDebuggeeWouldRun() const { return dumpStackOnDebuggeeWouldRun_; }
    ContextOptions& setDumpStackOnDebuggeeWouldRun(bool flag) {
        dumpStackOnDebuggeeWouldRun_ = flag;
        return *this;
    }

    bool werror() const { return werror_; }
    ContextOptions& setWerror(bool flag) {
        werror_ = flag;
        return *this;
    }
    ContextOptions& toggleWerror() {
        werror_ = !werror_;
        return *this;
    }

    bool strictMode() const { return strictMode_; }
    ContextOptions& setStrictMode(bool flag) {
        strictMode_ = flag;
        return *this;
    }
    ContextOptions& toggleStrictMode() {
        strictMode_ = !strictMode_;
        return *this;
    }

    bool extraWarnings() const { return extraWarnings_; }
    ContextOptions& setExtraWarnings(bool flag) {
        extraWarnings_ = flag;
        return *this;
    }
    ContextOptions& toggleExtraWarnings() {
        extraWarnings_ = !extraWarnings_;
        return *this;
    }

    bool arrayProtoValues() const { return arrayProtoValues_; }
    ContextOptions& setArrayProtoValues(bool flag) {
        arrayProtoValues_ = flag;
        return *this;
    }

  private:
    bool baseline_ : 1;
    bool ion_ : 1;
    bool asmJS_ : 1;
    bool wasm_ : 1;
    bool wasmAlwaysBaseline_ : 1;
    bool throwOnAsmJSValidationFailure_ : 1;
    bool nativeRegExp_ : 1;
    bool unboxedArrays_ : 1;
    bool asyncStack_ : 1;
    bool throwOnDebuggeeWouldRun_ : 1;
    bool dumpStackOnDebuggeeWouldRun_ : 1;
    bool werror_ : 1;
    bool strictMode_ : 1;
    bool extraWarnings_ : 1;
    bool arrayProtoValues_ : 1;
};

JS_PUBLIC_API(ContextOptions&)
ContextOptionsRef(JSContext* cx);

/**
 * Initialize the runtime's self-hosted code. Embeddings should call this
 * exactly once per runtime/context, before the first JS_NewGlobalObject
 * call.
 */
JS_PUBLIC_API(bool)
InitSelfHostedCode(JSContext* cx);

/**
 * Asserts (in debug and release builds) that `obj` belongs to the current
 * thread's context.
 */
JS_PUBLIC_API(void)
AssertObjectBelongsToCurrentThread(JSObject* obj);

} /* namespace JS */

extern JS_PUBLIC_API(const char*)
JS_GetImplementationVersion(void);

extern JS_PUBLIC_API(void)
JS_SetDestroyCompartmentCallback(JSContext* cx, JSDestroyCompartmentCallback callback);

extern JS_PUBLIC_API(void)
JS_SetSizeOfIncludingThisCompartmentCallback(JSContext* cx,
                                             JSSizeOfIncludingThisCompartmentCallback callback);

extern JS_PUBLIC_API(void)
JS_SetDestroyZoneCallback(JSContext* cx, JSZoneCallback callback);

extern JS_PUBLIC_API(void)
JS_SetSweepZoneCallback(JSContext* cx, JSZoneCallback callback);

extern JS_PUBLIC_API(void)
JS_SetCompartmentNameCallback(JSContext* cx, JSCompartmentNameCallback callback);

extern JS_PUBLIC_API(void)
JS_SetWrapObjectCallbacks(JSContext* cx, const JSWrapObjectCallbacks* callbacks);

extern JS_PUBLIC_API(void)
JS_SetCompartmentPrivate(JSCompartment* compartment, void* data);

extern JS_PUBLIC_API(void*)
JS_GetCompartmentPrivate(JSCompartment* compartment);

extern JS_PUBLIC_API(void)
JS_SetZoneUserData(JS::Zone* zone, void* data);

extern JS_PUBLIC_API(void*)
JS_GetZoneUserData(JS::Zone* zone);

extern JS_PUBLIC_API(bool)
JS_WrapObject(JSContext* cx, JS::MutableHandleObject objp);

extern JS_PUBLIC_API(bool)
JS_WrapValue(JSContext* cx, JS::MutableHandleValue vp);

extern JS_PUBLIC_API(JSObject*)
JS_TransplantObject(JSContext* cx, JS::HandleObject origobj, JS::HandleObject target);

extern JS_PUBLIC_API(bool)
JS_RefreshCrossCompartmentWrappers(JSContext* cx, JS::Handle<JSObject*> obj);

/*
 * At any time, a JSContext has a current (possibly-nullptr) compartment.
 * Compartments are described in:
 *
 *   developer.mozilla.org/en-US/docs/SpiderMonkey/SpiderMonkey_compartments
 *
 * The current compartment of a context may be changed. The preferred way to do
 * this is with JSAutoCompartment:
 *
 *   void foo(JSContext* cx, JSObject* obj) {
 *     // in some compartment 'c'
 *     {
 *       JSAutoCompartment ac(cx, obj);  // constructor enters
 *       // in the compartment of 'obj'
 *     }                                 // destructor leaves
 *     // back in compartment 'c'
 *   }
 *
 * For more complicated uses that don't neatly fit in a C++ stack frame, the
 * compartment can entered and left using separate function calls:
 *
 *   void foo(JSContext* cx, JSObject* obj) {
 *     // in 'oldCompartment'
 *     JSCompartment* oldCompartment = JS_EnterCompartment(cx, obj);
 *     // in the compartment of 'obj'
 *     JS_LeaveCompartment(cx, oldCompartment);
 *     // back in 'oldCompartment'
 *   }
 *
 * Note: these calls must still execute in a LIFO manner w.r.t all other
 * enter/leave calls on the context. Furthermore, only the return value of a
 * JS_EnterCompartment call may be passed as the 'oldCompartment' argument of
 * the corresponding JS_LeaveCompartment call.
 */

class MOZ_RAII JS_PUBLIC_API(JSAutoCompartment)
{
    JSContext* cx_;
    JSCompartment* oldCompartment_;
  public:
    JSAutoCompartment(JSContext* cx, JSObject* target
                      MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
    JSAutoCompartment(JSContext* cx, JSScript* target
                      MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
    ~JSAutoCompartment();

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

class MOZ_RAII JS_PUBLIC_API(JSAutoNullableCompartment)
{
    JSContext* cx_;
    JSCompartment* oldCompartment_;
  public:
    explicit JSAutoNullableCompartment(JSContext* cx, JSObject* targetOrNull
                                       MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
    ~JSAutoNullableCompartment();

    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

/** NB: This API is infallible; a nullptr return value does not indicate error. */
extern JS_PUBLIC_API(JSCompartment*)
JS_EnterCompartment(JSContext* cx, JSObject* target);

extern JS_PUBLIC_API(void)
JS_LeaveCompartment(JSContext* cx, JSCompartment* oldCompartment);

typedef void (*JSIterateCompartmentCallback)(JSContext* cx, void* data, JSCompartment* compartment);

/**
 * This function calls |compartmentCallback| on every compartment. Beware that
 * there is no guarantee that the compartment will survive after the callback
 * returns. Also, barriers are disabled via the TraceSession.
 */
extern JS_PUBLIC_API(void)
JS_IterateCompartments(JSContext* cx, void* data,
                       JSIterateCompartmentCallback compartmentCallback);

/**
 * Initialize standard JS class constructors, prototypes, and any top-level
 * functions and constants associated with the standard classes (e.g. isNaN
 * for Number).
 *
 * NB: This sets cx's global object to obj if it was null.
 */
extern JS_PUBLIC_API(bool)
JS_InitStandardClasses(JSContext* cx, JS::Handle<JSObject*> obj);

/**
 * Resolve id, which must contain either a string or an int, to a standard
 * class name in obj if possible, defining the class's constructor and/or
 * prototype and storing true in *resolved.  If id does not name a standard
 * class or a top-level property induced by initializing a standard class,
 * store false in *resolved and just return true.  Return false on error,
 * as usual for bool result-typed API entry points.
 *
 * This API can be called directly from a global object class's resolve op,
 * to define standard classes lazily.  The class's enumerate op should call
 * JS_EnumerateStandardClasses(cx, obj), to define eagerly during for..in
 * loops any classes not yet resolved lazily.
 */
extern JS_PUBLIC_API(bool)
JS_ResolveStandardClass(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* resolved);

extern JS_PUBLIC_API(bool)
JS_MayResolveStandardClass(const JSAtomState& names, jsid id, JSObject* maybeObj);

extern JS_PUBLIC_API(bool)
JS_EnumerateStandardClasses(JSContext* cx, JS::HandleObject obj);

extern JS_PUBLIC_API(bool)
JS_GetClassObject(JSContext* cx, JSProtoKey key, JS::MutableHandle<JSObject*> objp);

extern JS_PUBLIC_API(bool)
JS_GetClassPrototype(JSContext* cx, JSProtoKey key, JS::MutableHandle<JSObject*> objp);

namespace JS {

/*
 * Determine if the given object is an instance/prototype/constructor for a standard
 * class. If so, return the associated JSProtoKey. If not, return JSProto_Null.
 */

extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardInstance(JSObject* obj);

extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardPrototype(JSObject* obj);

extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardInstanceOrPrototype(JSObject* obj);

extern JS_PUBLIC_API(JSProtoKey)
IdentifyStandardConstructor(JSObject* obj);

extern JS_PUBLIC_API(void)
ProtoKeyToId(JSContext* cx, JSProtoKey key, JS::MutableHandleId idp);

} /* namespace JS */

extern JS_PUBLIC_API(JSProtoKey)
JS_IdToProtoKey(JSContext* cx, JS::HandleId id);

/**
 * Returns the original value of |Function.prototype| from the global object in
 * which |forObj| was created.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetFunctionPrototype(JSContext* cx, JS::HandleObject forObj);

/**
 * Returns the original value of |Object.prototype| from the global object in
 * which |forObj| was created.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetObjectPrototype(JSContext* cx, JS::HandleObject forObj);

/**
 * Returns the original value of |Array.prototype| from the global object in
 * which |forObj| was created.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetArrayPrototype(JSContext* cx, JS::HandleObject forObj);

/**
 * Returns the original value of |Error.prototype| from the global
 * object of the current compartment of cx.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetErrorPrototype(JSContext* cx);

/**
 * Returns the %IteratorPrototype% object that all built-in iterator prototype
 * chains go through for the global object of the current compartment of cx.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetIteratorPrototype(JSContext* cx);

extern JS_PUBLIC_API(JSObject*)
JS_GetGlobalForObject(JSContext* cx, JSObject* obj);

extern JS_PUBLIC_API(bool)
JS_IsGlobalObject(JSObject* obj);

extern JS_PUBLIC_API(JSObject*)
JS_GlobalLexicalEnvironment(JSObject* obj);

extern JS_PUBLIC_API(bool)
JS_HasExtensibleLexicalEnvironment(JSObject* obj);

extern JS_PUBLIC_API(JSObject*)
JS_ExtensibleLexicalEnvironment(JSObject* obj);

/**
 * May return nullptr, if |c| never had a global (e.g. the atoms compartment),
 * or if |c|'s global has been collected.
 */
extern JS_PUBLIC_API(JSObject*)
JS_GetGlobalForCompartmentOrNull(JSContext* cx, JSCompartment* c);

namespace JS {

extern JS_PUBLIC_API(JSObject*)
CurrentGlobalOrNull(JSContext* cx);

} // namespace JS

/**
 * Add 'Reflect.parse', a SpiderMonkey extension, to the Reflect object on the
 * given global.
 */
extern JS_PUBLIC_API(bool)
JS_InitReflectParse(JSContext* cx, JS::HandleObject global);

/**
 * Add various profiling-related functions as properties of the given object.
 * Defined in builtin/Profilers.cpp.
 */
extern JS_PUBLIC_API(bool)
JS_DefineProfilingFunctions(JSContext* cx, JS::HandleObject obj);

/* Defined in vm/Debugger.cpp. */
extern JS_PUBLIC_API(bool)
JS_DefineDebuggerObject(JSContext* cx, JS::HandleObject obj);

#ifdef JS_HAS_CTYPES
/**
 * Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'
 * object will be sealed.
 */
extern JS_PUBLIC_API(bool)
JS_InitCTypesClass(JSContext* cx, JS::HandleObject global);

/**
 * Convert a unicode string 'source' of length 'slen' to the platform native
 * charset, returning a null-terminated string allocated with JS_malloc. On
 * failure, this function should report an error.
 */
typedef char*
(* JSCTypesUnicodeToNativeFun)(JSContext* cx, const char16_t* source, size_t slen);

/**
 * Set of function pointers that ctypes can use for various internal functions.
 * See JS_SetCTypesCallbacks below. Providing nullptr for a function is safe,
 * and will result in the applicable ctypes functionality not being available.
 */
struct JSCTypesCallbacks {
    JSCTypesUnicodeToNativeFun unicodeToNative;
};

typedef struct JSCTypesCallbacks JSCTypesCallbacks;

/**
 * Set the callbacks on the provided 'ctypesObj' object. 'callbacks' should be a
 * pointer to static data that exists for the lifetime of 'ctypesObj', but it
 * may safely be altered after calling this function and without having
 * to call this function again.
 */
extern JS_PUBLIC_API(void)
JS_SetCTypesCallbacks(JSObject* ctypesObj, const JSCTypesCallbacks* callbacks);
#endif

extern JS_PUBLIC_API(void*)
JS_malloc(JSContext* cx, size_t nbytes);

extern JS_PUBLIC_API(void*)
JS_realloc(JSContext* cx, void* p, size_t oldBytes, size_t newBytes);

/**
 * A wrapper for js_free(p) that may delay js_free(p) invocation as a
 * performance optimization.
 * cx may be nullptr.
 */
extern JS_PUBLIC_API(void)
JS_free(JSContext* cx, void* p);

/**
 * A wrapper for js_free(p) that may delay js_free(p) invocation as a
 * performance optimization as specified by the given JSFreeOp instance.
 */
extern JS_PUBLIC_API(void)
JS_freeop(JSFreeOp* fop, void* p);

extern JS_PUBLIC_API(void)
JS_updateMallocCounter(JSContext* cx, size_t nbytes);

extern JS_PUBLIC_API(char*)
JS_strdup(JSContext* cx, const char* s);

/**
 * Register externally maintained GC roots.
 *
 * traceOp: the trace operation. For each root the implementation should call
 *          JS::TraceEdge whenever the root contains a traceable thing.
 * data:    the data argument to pass to each invocation of traceOp.
 */
extern JS_PUBLIC_API(bool)
JS_AddExtraGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data);

/** Undo a call to JS_AddExtraGCRootsTracer. */
extern JS_PUBLIC_API(void)
JS_RemoveExtraGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data);

/*
 * Garbage collector API.
 */
extern JS_PUBLIC_API(void)
JS_GC(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_MaybeGC(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_SetGCCallback(JSContext* cx, JSGCCallback cb, void* data);

extern JS_PUBLIC_API(void)
JS_SetObjectsTenuredCallback(JSContext* cx, JSObjectsTenuredCallback cb,
                             void* data);

extern JS_PUBLIC_API(bool)
JS_AddFinalizeCallback(JSContext* cx, JSFinalizeCallback cb, void* data);

extern JS_PUBLIC_API(void)
JS_RemoveFinalizeCallback(JSContext* cx, JSFinalizeCallback cb);

/*
 * Weak pointers and garbage collection
 *
 * Weak pointers are by their nature not marked as part of garbage collection,
 * but they may need to be updated in two cases after a GC:
 *
 *  1) Their referent was found not to be live and is about to be finalized
 *  2) Their referent has been moved by a compacting GC
 *
 * To handle this, any part of the system that maintain weak pointers to
 * JavaScript GC things must register a callback with
 * JS_(Add,Remove)WeakPointer{ZoneGroup,Compartment}Callback(). This callback
 * must then call JS_UpdateWeakPointerAfterGC() on all weak pointers it knows
 * about.
 *
 * Since sweeping is incremental, we have several callbacks to avoid repeatedly
 * having to visit all embedder structures. The WeakPointerZoneGroupCallback is
 * called once for each strongly connected group of zones, whereas the
 * WeakPointerCompartmentCallback is called once for each compartment that is
 * visited while sweeping. Structures that cannot contain references in more
 * than one compartment should sweep the relevant per-compartment structures
 * using the latter callback to minimizer per-slice overhead.
 *
 * The argument to JS_UpdateWeakPointerAfterGC() is an in-out param. If the
 * referent is about to be finalized the pointer will be set to null. If the
 * referent has been moved then the pointer will be updated to point to the new
 * location.
 *
 * Callers of this method are responsible for updating any state that is
 * dependent on the object's address. For example, if the object's address is
 * used as a key in a hashtable, then the object must be removed and
 * re-inserted with the correct hash.
 */

extern JS_PUBLIC_API(bool)
JS_AddWeakPointerZoneGroupCallback(JSContext* cx, JSWeakPointerZoneGroupCallback cb, void* data);

extern JS_PUBLIC_API(void)
JS_RemoveWeakPointerZoneGroupCallback(JSContext* cx, JSWeakPointerZoneGroupCallback cb);

extern JS_PUBLIC_API(bool)
JS_AddWeakPointerCompartmentCallback(JSContext* cx, JSWeakPointerCompartmentCallback cb,
                                     void* data);

extern JS_PUBLIC_API(void)
JS_RemoveWeakPointerCompartmentCallback(JSContext* cx, JSWeakPointerCompartmentCallback cb);

extern JS_PUBLIC_API(void)
JS_UpdateWeakPointerAfterGC(JS::Heap<JSObject*>* objp);

extern JS_PUBLIC_API(void)
JS_UpdateWeakPointerAfterGCUnbarriered(JSObject** objp);

typedef enum JSGCParamKey {
    /** Maximum nominal heap before last ditch GC. */
    JSGC_MAX_BYTES          = 0,

    /** Number of JS_malloc bytes before last ditch GC. */
    JSGC_MAX_MALLOC_BYTES   = 1,

    /** Amount of bytes allocated by the GC. */
    JSGC_BYTES = 3,

    /** Number of times GC has been invoked. Includes both major and minor GC. */
    JSGC_NUMBER = 4,

    /** Select GC mode. */
    JSGC_MODE = 6,

    /** Number of cached empty GC chunks. */
    JSGC_UNUSED_CHUNKS = 7,

    /** Total number of allocated GC chunks. */
    JSGC_TOTAL_CHUNKS = 8,

    /** Max milliseconds to spend in an incremental GC slice. */
    JSGC_SLICE_TIME_BUDGET = 9,

    /** Maximum size the GC mark stack can grow to. */
    JSGC_MARK_STACK_LIMIT = 10,

    /**
     * GCs less than this far apart in time will be considered 'high-frequency GCs'.
     * See setGCLastBytes in jsgc.cpp.
     */
    JSGC_HIGH_FREQUENCY_TIME_LIMIT = 11,

    /** Start of dynamic heap growth. */
    JSGC_HIGH_FREQUENCY_LOW_LIMIT = 12,

    /** End of dynamic heap growth. */
    JSGC_HIGH_FREQUENCY_HIGH_LIMIT = 13,

    /** Upper bound of heap growth. */
    JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX = 14,

    /** Lower bound of heap growth. */
    JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN = 15,

    /** Heap growth for low frequency GCs. */
    JSGC_LOW_FREQUENCY_HEAP_GROWTH = 16,

    /**
     * If false, the heap growth factor is fixed at 3. If true, it is determined
     * based on whether GCs are high- or low- frequency.
     */
    JSGC_DYNAMIC_HEAP_GROWTH = 17,

    /** If true, high-frequency GCs will use a longer mark slice. */
    JSGC_DYNAMIC_MARK_SLICE = 18,

    /** Lower limit after which we limit the heap growth. */
    JSGC_ALLOCATION_THRESHOLD = 19,

    /**
     * We try to keep at least this many unused chunks in the free chunk pool at
     * all times, even after a shrinking GC.
     */
    JSGC_MIN_EMPTY_CHUNK_COUNT = 21,

    /** We never keep more than this many unused chunks in the free chunk pool. */
    JSGC_MAX_EMPTY_CHUNK_COUNT = 22,

    /** Whether compacting GC is enabled. */
    JSGC_COMPACTING_ENABLED = 23,

    /** If true, painting can trigger IGC slices. */
    JSGC_REFRESH_FRAME_SLICES_ENABLED = 24,
} JSGCParamKey;

extern JS_PUBLIC_API(void)
JS_SetGCParameter(JSContext* cx, JSGCParamKey key, uint32_t value);

extern JS_PUBLIC_API(void)
JS_SetGGCMode(JSContext* cx, bool enabled);

extern JS_PUBLIC_API(uint32_t)
JS_GetGCParameter(JSContext* cx, JSGCParamKey key);

extern JS_PUBLIC_API(void)
JS_SetGCParametersBasedOnAvailableMemory(JSContext* cx, uint32_t availMem);

/**
 * Create a new JSString whose chars member refers to external memory, i.e.,
 * memory requiring application-specific finalization.
 */
extern JS_PUBLIC_API(JSString*)
JS_NewExternalString(JSContext* cx, const char16_t* chars, size_t length,
                     const JSStringFinalizer* fin);

/**
 * Return whether 'str' was created with JS_NewExternalString or
 * JS_NewExternalStringWithClosure.
 */
extern JS_PUBLIC_API(bool)
JS_IsExternalString(JSString* str);

/**
 * Return the 'fin' arg passed to JS_NewExternalString.
 */
extern JS_PUBLIC_API(const JSStringFinalizer*)
JS_GetExternalStringFinalizer(JSString* str);

/**
 * Set the size of the native stack that should not be exceed. To disable
 * stack size checking pass 0.
 *
 * SpiderMonkey allows for a distinction between system code (such as GCs, which
 * may incidentally be triggered by script but are not strictly performed on
 * behalf of such script), trusted script (as determined by JS_SetTrustedPrincipals),
 * and untrusted script. Each kind of code may have a different stack quota,
 * allowing embedders to keep higher-priority machinery running in the face of
 * scripted stack exhaustion by something else.
 *
 * The stack quotas for each kind of code should be monotonically descending,
 * and may be specified with this function. If 0 is passed for a given kind
 * of code, it defaults to the value of the next-highest-priority kind.
 *
 * This function may only be called immediately after the runtime is initialized
 * and before any code is executed and/or interrupts requested.
 */
extern JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSContext* cx, size_t systemCodeStackSize,
                       size_t trustedScriptStackSize = 0,
                       size_t untrustedScriptStackSize = 0);

/************************************************************************/

extern JS_PUBLIC_API(bool)
JS_ValueToId(JSContext* cx, JS::HandleValue v, JS::MutableHandleId idp);

extern JS_PUBLIC_API(bool)
JS_StringToId(JSContext* cx, JS::HandleString s, JS::MutableHandleId idp);

extern JS_PUBLIC_API(bool)
JS_IdToValue(JSContext* cx, jsid id, JS::MutableHandle<JS::Value> vp);

namespace JS {

/**
 * Convert obj to a primitive value. On success, store the result in vp and
 * return true.
 *
 * The hint argument must be JSTYPE_STRING, JSTYPE_NUMBER, or JSTYPE_VOID (no
 * hint).
 *
 * Implements: ES6 7.1.1 ToPrimitive(input, [PreferredType]).
 */
extern JS_PUBLIC_API(bool)
ToPrimitive(JSContext* cx, JS::HandleObject obj, JSType hint, JS::MutableHandleValue vp);

/**
 * If args.get(0) is one of the strings "string", "number", or "default", set
 * *result to JSTYPE_STRING, JSTYPE_NUMBER, or JSTYPE_VOID accordingly and
 * return true. Otherwise, return false with a TypeError pending.
 *
 * This can be useful in implementing a @@toPrimitive method.
 */
extern JS_PUBLIC_API(bool)
GetFirstArgumentAsTypeHint(JSContext* cx, CallArgs args, JSType *result);

} /* namespace JS */

extern JS_PUBLIC_API(bool)
JS_PropertyStub(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                JS::MutableHandleValue vp);

extern JS_PUBLIC_API(bool)
JS_StrictPropertyStub(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                      JS::MutableHandleValue vp, JS::ObjectOpResult& result);

template<typename T>
struct JSConstScalarSpec {
    const char* name;
    T val;
};

typedef JSConstScalarSpec<double> JSConstDoubleSpec;
typedef JSConstScalarSpec<int32_t> JSConstIntegerSpec;

struct JSJitInfo;

/**
 * Wrapper to relace JSNative for JSPropertySpecs and JSFunctionSpecs. This will
 * allow us to pass one JSJitInfo per function with the property/function spec,
 * without additional field overhead.
 */
typedef struct JSNativeWrapper {
    JSNative        op;
    const JSJitInfo* info;
} JSNativeWrapper;

/*
 * Macro static initializers which make it easy to pass no JSJitInfo as part of a
 * JSPropertySpec or JSFunctionSpec.
 */
#define JSNATIVE_WRAPPER(native) { {native, nullptr} }

/**
 * Description of a property. JS_DefineProperties and JS_InitClass take arrays
 * of these and define many properties at once. JS_PSG, JS_PSGS and JS_PS_END
 * are helper macros for defining such arrays.
 */
struct JSPropertySpec {
    struct SelfHostedWrapper {
        void*       unused;
        const char* funname;
    };

    struct ValueWrapper {
        uintptr_t   type;
        union {
            const char* string;
            int32_t     int32;
        };
    };

    const char*                 name;
    uint8_t                     flags;
    union {
        struct {
            union {
                JSNativeWrapper    native;
                SelfHostedWrapper  selfHosted;
            } getter;
            union {
                JSNativeWrapper    native;
                SelfHostedWrapper  selfHosted;
            } setter;
        } accessors;
        ValueWrapper            value;
    };

    bool isAccessor() const {
        return !(flags & JSPROP_INTERNAL_USE_BIT);
    }
    JS_PUBLIC_API(bool) getValue(JSContext* cx, JS::MutableHandleValue value) const;

    bool isSelfHosted() const {
        MOZ_ASSERT(isAccessor());

#ifdef DEBUG
        // Verify that our accessors match our JSPROP_GETTER flag.
        if (flags & JSPROP_GETTER)
            checkAccessorsAreSelfHosted();
        else
            checkAccessorsAreNative();
#endif
        return (flags & JSPROP_GETTER);
    }

    static_assert(sizeof(SelfHostedWrapper) == sizeof(JSNativeWrapper),
                  "JSPropertySpec::getter/setter must be compact");
    static_assert(offsetof(SelfHostedWrapper, funname) == offsetof(JSNativeWrapper, info),
                  "JS_SELF_HOSTED* macros below require that "
                  "SelfHostedWrapper::funname overlay "
                  "JSNativeWrapper::info");
private:
    void checkAccessorsAreNative() const {
        MOZ_ASSERT(accessors.getter.native.op);
        // We may not have a setter at all.  So all we can assert here, for the
        // native case is that if we have a jitinfo for the setter then we have
        // a setter op too.  This is good enough to make sure we don't have a
        // SelfHostedWrapper for the setter.
        MOZ_ASSERT_IF(accessors.setter.native.info, accessors.setter.native.op);
    }

    void checkAccessorsAreSelfHosted() const {
        MOZ_ASSERT(!accessors.getter.selfHosted.unused);
        MOZ_ASSERT(!accessors.setter.selfHosted.unused);
    }
};

namespace JS {
namespace detail {

/* NEVER DEFINED, DON'T USE.  For use by JS_CAST_NATIVE_TO only. */
inline int CheckIsNative(JSNative native);

/* NEVER DEFINED, DON'T USE.  For use by JS_CAST_STRING_TO only. */
template<size_t N>
inline int
CheckIsCharacterLiteral(const char (&arr)[N]);

/* NEVER DEFINED, DON'T USE.  For use by JS_CAST_INT32_TO only. */
inline int CheckIsInt32(int32_t value);

/* NEVER DEFINED, DON'T USE.  For use by JS_PROPERTYOP_GETTER only. */
inline int CheckIsGetterOp(JSGetterOp op);

/* NEVER DEFINED, DON'T USE.  For use by JS_PROPERTYOP_SETTER only. */
inline int CheckIsSetterOp(JSSetterOp op);

} // namespace detail
} // namespace JS

#define JS_CAST_NATIVE_TO(v, To) \
  (static_cast<void>(sizeof(JS::detail::CheckIsNative(v))), \
   reinterpret_cast<To>(v))

#define JS_CAST_STRING_TO(s, To) \
  (static_cast<void>(sizeof(JS::detail::CheckIsCharacterLiteral(s))), \
   reinterpret_cast<To>(s))

#define JS_CAST_INT32_TO(s, To) \
  (static_cast<void>(sizeof(JS::detail::CheckIsInt32(s))), \
   reinterpret_cast<To>(s))

#define JS_CHECK_ACCESSOR_FLAGS(flags) \
  (static_cast<mozilla::EnableIf<((flags) & ~(JSPROP_ENUMERATE | JSPROP_PERMANENT)) == 0>::Type>(0), \
   (flags))

#define JS_PROPERTYOP_GETTER(v) \
  (static_cast<void>(sizeof(JS::detail::CheckIsGetterOp(v))), \
   reinterpret_cast<JSNative>(v))

#define JS_PROPERTYOP_SETTER(v) \
  (static_cast<void>(sizeof(JS::detail::CheckIsSetterOp(v))), \
   reinterpret_cast<JSNative>(v))

#define JS_STUBGETTER JS_PROPERTYOP_GETTER(JS_PropertyStub)

#define JS_STUBSETTER JS_PROPERTYOP_SETTER(JS_StrictPropertyStub)

#define JS_PS_ACCESSOR_SPEC(name, getter, setter, flags, extraFlags) \
    { name, uint8_t(JS_CHECK_ACCESSOR_FLAGS(flags) | extraFlags), \
      { {  getter, setter  } } }
#define JS_PS_VALUE_SPEC(name, value, flags) \
    { name, uint8_t(flags | JSPROP_INTERNAL_USE_BIT), \
      { { value, JSNATIVE_WRAPPER(nullptr) } } }

#define SELFHOSTED_WRAPPER(name) \
    { { nullptr, JS_CAST_STRING_TO(name, const JSJitInfo*) } }
#define STRINGVALUE_WRAPPER(value) \
    { { reinterpret_cast<JSNative>(JSVAL_TYPE_STRING), JS_CAST_STRING_TO(value, const JSJitInfo*) } }
#define INT32VALUE_WRAPPER(value) \
    { { reinterpret_cast<JSNative>(JSVAL_TYPE_INT32), JS_CAST_INT32_TO(value, const JSJitInfo*) } }

/*
 * JSPropertySpec uses JSNativeWrapper.  These macros encapsulate the definition
 * of JSNative-backed JSPropertySpecs, by defining the JSNativeWrappers for
 * them.
 */
#define JS_PSG(name, getter, flags) \
    JS_PS_ACCESSOR_SPEC(name, JSNATIVE_WRAPPER(getter), JSNATIVE_WRAPPER(nullptr), flags, \
                        JSPROP_SHARED)
#define JS_PSGS(name, getter, setter, flags) \
    JS_PS_ACCESSOR_SPEC(name, JSNATIVE_WRAPPER(getter), JSNATIVE_WRAPPER(setter), flags, \
                         JSPROP_SHARED)
#define JS_SELF_HOSTED_GET(name, getterName, flags) \
    JS_PS_ACCESSOR_SPEC(name, SELFHOSTED_WRAPPER(getterName), JSNATIVE_WRAPPER(nullptr), flags, \
                         JSPROP_SHARED | JSPROP_GETTER)
#define JS_SELF_HOSTED_GETSET(name, getterName, setterName, flags) \
    JS_PS_ACCESSOR_SPEC(name, SELFHOSTED_WRAPPER(getterName), SELFHOSTED_WRAPPER(setterName), \
                         flags, JSPROP_SHARED | JSPROP_GETTER | JSPROP_SETTER)
#define JS_SELF_HOSTED_SYM_GET(symbol, getterName, flags) \
    JS_PS_ACCESSOR_SPEC(reinterpret_cast<const char*>(uint32_t(::JS::SymbolCode::symbol) + 1), \
                         SELFHOSTED_WRAPPER(getterName), JSNATIVE_WRAPPER(nullptr), flags, \
                         JSPROP_SHARED | JSPROP_GETTER)
#define JS_STRING_PS(name, string, flags) \
    JS_PS_VALUE_SPEC(name, STRINGVALUE_WRAPPER(string), flags)
#define JS_STRING_SYM_PS(symbol, string, flags) \
    JS_PS_VALUE_SPEC(reinterpret_cast<const char*>(uint32_t(::JS::SymbolCode::symbol) + 1), \
                     STRINGVALUE_WRAPPER(string), flags)
#define JS_INT32_PS(name, value, flags) \
    JS_PS_VALUE_SPEC(name, INT32VALUE_WRAPPER(value), flags)
#define JS_PS_END \
    JS_PS_ACCESSOR_SPEC(nullptr, JSNATIVE_WRAPPER(nullptr), JSNATIVE_WRAPPER(nullptr), 0, 0)

/**
 * To define a native function, set call to a JSNativeWrapper. To define a
 * self-hosted function, set selfHostedName to the name of a function
 * compiled during JSRuntime::initSelfHosting.
 */
struct JSFunctionSpec {
    const char*     name;
    JSNativeWrapper call;
    uint16_t        nargs;
    uint16_t        flags;
    const char*     selfHostedName;
};

/*
 * Terminating sentinel initializer to put at the end of a JSFunctionSpec array
 * that's passed to JS_DefineFunctions or JS_InitClass.
 */
#define JS_FS_END JS_FS(nullptr,nullptr,0,0)

/*
 * Initializer macros for a JSFunctionSpec array element. JS_FN (whose name pays
 * homage to the old JSNative/JSFastNative split) simply adds the flag
 * JSFUN_STUB_GSOPS. JS_FNINFO allows the simple adding of
 * JSJitInfos. JS_SELF_HOSTED_FN declares a self-hosted function.
 * JS_INLINABLE_FN allows specifying an InlinableNative enum value for natives
 * inlined or specialized by the JIT. Finally JS_FNSPEC has slots for all the
 * fields.
 *
 * The _SYM variants allow defining a function with a symbol key rather than a
 * string key. For example, use JS_SYM_FN(iterator, ...) to define an
 * @@iterator method.
 */
#define JS_FS(name,call,nargs,flags)                                          \
    JS_FNSPEC(name, call, nullptr, nargs, flags, nullptr)
#define JS_FN(name,call,nargs,flags)                                          \
    JS_FNSPEC(name, call, nullptr, nargs, (flags) | JSFUN_STUB_GSOPS, nullptr)
#define JS_INLINABLE_FN(name,call,nargs,flags,native)                         \
    JS_FNSPEC(name, call, &js::jit::JitInfo_##native, nargs, (flags) | JSFUN_STUB_GSOPS, nullptr)
#define JS_SYM_FN(symbol,call,nargs,flags)                                    \
    JS_SYM_FNSPEC(symbol, call, nullptr, nargs, (flags) | JSFUN_STUB_GSOPS, nullptr)
#define JS_FNINFO(name,call,info,nargs,flags)                                 \
    JS_FNSPEC(name, call, info, nargs, flags, nullptr)
#define JS_SELF_HOSTED_FN(name,selfHostedName,nargs,flags)                    \
    JS_FNSPEC(name, nullptr, nullptr, nargs, flags, selfHostedName)
#define JS_SELF_HOSTED_SYM_FN(symbol, selfHostedName, nargs, flags)           \
    JS_SYM_FNSPEC(symbol, nullptr, nullptr, nargs, flags, selfHostedName)
#define JS_SYM_FNSPEC(symbol, call, info, nargs, flags, selfHostedName)       \
    JS_FNSPEC(reinterpret_cast<const char*>(                                 \
                  uint32_t(::JS::SymbolCode::symbol) + 1),                    \
              call, info, nargs, flags, selfHostedName)
#define JS_FNSPEC(name,call,info,nargs,flags,selfHostedName)                  \
    {name, {call, info}, nargs, flags, selfHostedName}

extern JS_PUBLIC_API(JSObject*)
JS_InitClass(JSContext* cx, JS::HandleObject obj, JS::HandleObject parent_proto,
             const JSClass* clasp, JSNative constructor, unsigned nargs,
             const JSPropertySpec* ps, const JSFunctionSpec* fs,
             const JSPropertySpec* static_ps, const JSFunctionSpec* static_fs);

/**
 * Set up ctor.prototype = proto and proto.constructor = ctor with the
 * right property flags.
 */
extern JS_PUBLIC_API(bool)
JS_LinkConstructorAndPrototype(JSContext* cx, JS::Handle<JSObject*> ctor,
                               JS::Handle<JSObject*> proto);

extern JS_PUBLIC_API(const JSClass*)
JS_GetClass(JSObject* obj);

extern JS_PUBLIC_API(bool)
JS_InstanceOf(JSContext* cx, JS::Handle<JSObject*> obj, const JSClass* clasp, JS::CallArgs* args);

extern JS_PUBLIC_API(bool)
JS_HasInstance(JSContext* cx, JS::Handle<JSObject*> obj, JS::Handle<JS::Value> v, bool* bp);

namespace JS {

// Implementation of
// http://www.ecma-international.org/ecma-262/6.0/#sec-ordinaryhasinstance.  If
// you're looking for the equivalent of "instanceof", you want JS_HasInstance,
// not this function.
extern JS_PUBLIC_API(bool)
OrdinaryHasInstance(JSContext* cx, HandleObject objArg, HandleValue v, bool* bp);

// Implementation of
// https://www.ecma-international.org/ecma-262/6.0/#sec-instanceofoperator
// This is almost identical to JS_HasInstance, except the latter may call a
// custom hasInstance class op instead of InstanceofOperator.
extern JS_PUBLIC_API(bool)
InstanceofOperator(JSContext* cx, HandleObject obj, HandleValue v, bool* bp);

} // namespace JS

extern JS_PUBLIC_API(void*)
JS_GetPrivate(JSObject* obj);

extern JS_PUBLIC_API(void)
JS_SetPrivate(JSObject* obj, void* data);

extern JS_PUBLIC_API(void*)
JS_GetInstancePrivate(JSContext* cx, JS::Handle<JSObject*> obj, const JSClass* clasp,
                      JS::CallArgs* args);

extern JS_PUBLIC_API(JSObject*)
JS_GetConstructor(JSContext* cx, JS::Handle<JSObject*> proto);

namespace JS {

enum ZoneSpecifier {
    FreshZone = 0,
    SystemZone = 1
};

/**
 * CompartmentCreationOptions specifies options relevant to creating a new
 * compartment, that are either immutable characteristics of that compartment
 * or that are discarded after the compartment has been created.
 *
 * Access to these options on an existing compartment is read-only: if you
 * need particular selections, make them before you create the compartment.
 */
class JS_PUBLIC_API(CompartmentCreationOptions)
{
  public:
    CompartmentCreationOptions()
      : addonId_(nullptr),
        traceGlobal_(nullptr),
        invisibleToDebugger_(false),
        mergeable_(false),
        preserveJitCode_(false),
        cloneSingletons_(false),
        sharedMemoryAndAtomics_(false),
        secureContext_(false)
    {
        zone_.spec = JS::FreshZone;
    }

    // A null add-on ID means that the compartment is not associated with an
    // add-on.
    JSAddonId* addonIdOrNull() const { return addonId_; }
    CompartmentCreationOptions& setAddonId(JSAddonId* id) {
        addonId_ = id;
        return *this;
    }

    JSTraceOp getTrace() const {
        return traceGlobal_;
    }
    CompartmentCreationOptions& setTrace(JSTraceOp op) {
        traceGlobal_ = op;
        return *this;
    }

    void* zonePointer() const {
        MOZ_ASSERT(uintptr_t(zone_.pointer) > uintptr_t(JS::SystemZone));
        return zone_.pointer;
    }
    ZoneSpecifier zoneSpecifier() const { return zone_.spec; }
    CompartmentCreationOptions& setZone(ZoneSpecifier spec);
    CompartmentCreationOptions& setSameZoneAs(JSObject* obj);

    // Certain scopes (i.e. XBL compilation scopes) are implementation details
    // of the embedding, and references to them should never leak out to script.
    // This flag causes the this compartment to skip firing onNewGlobalObject
    // and makes addDebuggee a no-op for this global.
    bool invisibleToDebugger() const { return invisibleToDebugger_; }
    CompartmentCreationOptions& setInvisibleToDebugger(bool flag) {
        invisibleToDebugger_ = flag;
        return *this;
    }

    // Compartments used for off-thread compilation have their contents merged
    // into a target compartment when the compilation is finished. This is only
    // allowed if this flag is set. The invisibleToDebugger flag must also be
    // set for such compartments.
    bool mergeable() const { return mergeable_; }
    CompartmentCreationOptions& setMergeable(bool flag) {
        mergeable_ = flag;
        return *this;
    }

    // Determines whether this compartment should preserve JIT code on
    // non-shrinking GCs.
    bool preserveJitCode() const { return preserveJitCode_; }
    CompartmentCreationOptions& setPreserveJitCode(bool flag) {
        preserveJitCode_ = flag;
        return *this;
    }

    bool cloneSingletons() const { return cloneSingletons_; }
    CompartmentCreationOptions& setCloneSingletons(bool flag) {
        cloneSingletons_ = flag;
        return *this;
    }

    bool getSharedMemoryAndAtomicsEnabled() const;
    CompartmentCreationOptions& setSharedMemoryAndAtomicsEnabled(bool flag);

    // This flag doesn't affect JS engine behavior.  It is used by Gecko to
    // mark whether content windows and workers are "Secure Context"s. See
    // https://w3c.github.io/webappsec-secure-contexts/
    // https://bugzilla.mozilla.org/show_bug.cgi?id=1162772#c34
    bool secureContext() const { return secureContext_; }
    CompartmentCreationOptions& setSecureContext(bool flag) {
        secureContext_ = flag;
        return *this;
    }

  private:
    JSAddonId* addonId_;
    JSTraceOp traceGlobal_;
    union {
        ZoneSpecifier spec;
        void* pointer; // js::Zone* is not exposed in the API.
    } zone_;
    bool invisibleToDebugger_;
    bool mergeable_;
    bool preserveJitCode_;
    bool cloneSingletons_;
    bool sharedMemoryAndAtomics_;
    bool secureContext_;
};

/**
 * CompartmentBehaviors specifies behaviors of a compartment that can be
 * changed after the compartment's been created.
 */
class JS_PUBLIC_API(CompartmentBehaviors)
{
  public:
    class Override {
      public:
        Override() : mode_(Default) {}

        bool get(bool defaultValue) const {
            if (mode_ == Default)
                return defaultValue;
            return mode_ == ForceTrue;
        }

        void set(bool overrideValue) {
            mode_ = overrideValue ? ForceTrue : ForceFalse;
        }

        void reset() {
            mode_ = Default;
        }

      private:
        enum Mode {
            Default,
            ForceTrue,
            ForceFalse
        };

        Mode mode_;
    };

    CompartmentBehaviors()
      : version_(JSVERSION_UNKNOWN)
      , discardSource_(false)
      , disableLazyParsing_(false)
      , singletonsAsTemplates_(true)
    {
    }

    JSVersion version() const { return version_; }
    CompartmentBehaviors& setVersion(JSVersion aVersion) {
        MOZ_ASSERT(aVersion != JSVERSION_UNKNOWN);
        version_ = aVersion;
        return *this;
    }

    // For certain globals, we know enough about the code that will run in them
    // that we can discard script source entirely.
    bool discardSource() const { return discardSource_; }
    CompartmentBehaviors& setDiscardSource(bool flag) {
        discardSource_ = flag;
        return *this;
    }

    bool disableLazyParsing() const { return disableLazyParsing_; }
    CompartmentBehaviors& setDisableLazyParsing(bool flag) {
        disableLazyParsing_ = flag;
        return *this;
    }

    bool extraWarnings(JSContext* cx) const;
    Override& extraWarningsOverride() { return extraWarningsOverride_; }

    bool getSingletonsAsTemplates() const {
        return singletonsAsTemplates_;
    }
    CompartmentBehaviors& setSingletonsAsValues() {
        singletonsAsTemplates_ = false;
        return *this;
    }

  private:
    JSVersion version_;
    bool discardSource_;
    bool disableLazyParsing_;
    Override extraWarningsOverride_;

    // To XDR singletons, we need to ensure that all singletons are all used as
    // templates, by making JSOP_OBJECT return a clone of the JSScript
    // singleton, instead of returning the value which is baked in the JSScript.
    bool singletonsAsTemplates_;
};

/**
 * CompartmentOptions specifies compartment characteristics: both those that
 * can't be changed on a compartment once it's been created
 * (CompartmentCreationOptions), and those that can be changed on an existing
 * compartment (CompartmentBehaviors).
 */
class JS_PUBLIC_API(CompartmentOptions)
{
  public:
    explicit CompartmentOptions()
      : creationOptions_(),
        behaviors_()
    {}

    CompartmentOptions(const CompartmentCreationOptions& compartmentCreation,
                       const CompartmentBehaviors& compartmentBehaviors)
      : creationOptions_(compartmentCreation),
        behaviors_(compartmentBehaviors)
    {}

    // CompartmentCreationOptions specify fundamental compartment
    // characteristics that must be specified when the compartment is created,
    // that can't be changed after the compartment is created.
    CompartmentCreationOptions& creationOptions() {
        return creationOptions_;
    }
    const CompartmentCreationOptions& creationOptions() const {
        return creationOptions_;
    }

    // CompartmentBehaviors specify compartment characteristics that can be
    // changed after the compartment is created.
    CompartmentBehaviors& behaviors() {
        return behaviors_;
    }
    const CompartmentBehaviors& behaviors() const {
        return behaviors_;
    }

  private:
    CompartmentCreationOptions creationOptions_;
    CompartmentBehaviors behaviors_;
};

JS_PUBLIC_API(const CompartmentCreationOptions&)
CompartmentCreationOptionsRef(JSCompartment* compartment);

JS_PUBLIC_API(const CompartmentCreationOptions&)
CompartmentCreationOptionsRef(JSObject* obj);

JS_PUBLIC_API(const CompartmentCreationOptions&)
CompartmentCreationOptionsRef(JSContext* cx);

JS_PUBLIC_API(CompartmentBehaviors&)
CompartmentBehaviorsRef(JSCompartment* compartment);

JS_PUBLIC_API(CompartmentBehaviors&)
CompartmentBehaviorsRef(JSObject* obj);

JS_PUBLIC_API(CompartmentBehaviors&)
CompartmentBehaviorsRef(JSContext* cx);

/**
 * During global creation, we fire notifications to callbacks registered
 * via the Debugger API. These callbacks are arbitrary script, and can touch
 * the global in arbitrary ways. When that happens, the global should not be
 * in a half-baked state. But this creates a problem for consumers that need
 * to set slots on the global to put it in a consistent state.
 *
 * This API provides a way for consumers to set slots atomically (immediately
 * after the global is created), before any debugger hooks are fired. It's
 * unfortunately on the clunky side, but that's the way the cookie crumbles.
 *
 * If callers have no additional state on the global to set up, they may pass
 * |FireOnNewGlobalHook| to JS_NewGlobalObject, which causes that function to
 * fire the hook as its final act before returning. Otherwise, callers should
 * pass |DontFireOnNewGlobalHook|, which means that they are responsible for
 * invoking JS_FireOnNewGlobalObject upon successfully creating the global. If
 * an error occurs and the operation aborts, callers should skip firing the
 * hook. But otherwise, callers must take care to fire the hook exactly once
 * before compiling any script in the global's scope (we have assertions in
 * place to enforce this). This lets us be sure that debugger clients never miss
 * breakpoints.
 */
enum OnNewGlobalHookOption {
    FireOnNewGlobalHook,
    DontFireOnNewGlobalHook
};

} /* namespace JS */

extern JS_PUBLIC_API(JSObject*)
JS_NewGlobalObject(JSContext* cx, const JSClass* clasp, JSPrincipals* principals,
                   JS::OnNewGlobalHookOption hookOption,
                   const JS::CompartmentOptions& options);
/**
 * Spidermonkey does not have a good way of keeping track of what compartments should be marked on
 * their own. We can mark the roots unconditionally, but marking GC things only relevant in live
 * compartments is hard. To mitigate this, we create a static trace hook, installed on each global
 * object, from which we can be sure the compartment is relevant, and mark it.
 *
 * It is still possible to specify custom trace hooks for global object classes. They can be
 * provided via the CompartmentOptions passed to JS_NewGlobalObject.
 */
extern JS_PUBLIC_API(void)
JS_GlobalObjectTraceHook(JSTracer* trc, JSObject* global);

extern JS_PUBLIC_API(void)
JS_FireOnNewGlobalObject(JSContext* cx, JS::HandleObject global);

extern JS_PUBLIC_API(JSObject*)
JS_NewObject(JSContext* cx, const JSClass* clasp);

extern JS_PUBLIC_API(bool)
JS_IsNative(JSObject* obj);

/**
 * Unlike JS_NewObject, JS_NewObjectWithGivenProto does not compute a default
 * proto. If proto is nullptr, the JS object will have `null` as [[Prototype]].
 */
extern JS_PUBLIC_API(JSObject*)
JS_NewObjectWithGivenProto(JSContext* cx, const JSClass* clasp, JS::Handle<JSObject*> proto);

/** Creates a new plain object, like `new Object()`, with Object.prototype as [[Prototype]]. */
extern JS_PUBLIC_API(JSObject*)
JS_NewPlainObject(JSContext* cx);

/**
 * Freeze obj, and all objects it refers to, recursively. This will not recurse
 * through non-extensible objects, on the assumption that those are already
 * deep-frozen.
 */
extern JS_PUBLIC_API(bool)
JS_DeepFreezeObject(JSContext* cx, JS::Handle<JSObject*> obj);

/**
 * Freezes an object; see ES5's Object.freeze(obj) method.
 */
extern JS_PUBLIC_API(bool)
JS_FreezeObject(JSContext* cx, JS::Handle<JSObject*> obj);


/*** Property descriptors ************************************************************************/

namespace JS {

struct JS_PUBLIC_API(PropertyDescriptor) {
    JSObject* obj;
    unsigned attrs;
    JSGetterOp getter;
    JSSetterOp setter;
    JS::Value value;

    PropertyDescriptor()
      : obj(nullptr), attrs(0), getter(nullptr), setter(nullptr), value(JS::UndefinedValue())
    {}

    static void trace(PropertyDescriptor* self, JSTracer* trc) { self->trace(trc); }
    void trace(JSTracer* trc);
};

template <typename Outer>
class PropertyDescriptorOperations
{
    const PropertyDescriptor& desc() const { return static_cast<const Outer*>(this)->get(); }

    bool has(unsigned bit) const {
        MOZ_ASSERT(bit != 0);
        MOZ_ASSERT((bit & (bit - 1)) == 0);  // only a single bit
        return (desc().attrs & bit) != 0;
    }

    bool hasAny(unsigned bits) const {
        return (desc().attrs & bits) != 0;
    }

    bool hasAll(unsigned bits) const {
        return (desc().attrs & bits) == bits;
    }

    // Non-API attributes bit used internally for arguments objects.
    enum { SHADOWABLE = JSPROP_INTERNAL_USE_BIT };

  public:
    // Descriptors with JSGetterOp/JSSetterOp are considered data
    // descriptors. It's complicated.
    bool isAccessorDescriptor() const { return hasAny(JSPROP_GETTER | JSPROP_SETTER); }
    bool isGenericDescriptor() const {
        return (desc().attrs&
                (JSPROP_GETTER | JSPROP_SETTER | JSPROP_IGNORE_READONLY | JSPROP_IGNORE_VALUE)) ==
               (JSPROP_IGNORE_READONLY | JSPROP_IGNORE_VALUE);
    }
    bool isDataDescriptor() const { return !isAccessorDescriptor() && !isGenericDescriptor(); }

    bool hasConfigurable() const { return !has(JSPROP_IGNORE_PERMANENT); }
    bool configurable() const { MOZ_ASSERT(hasConfigurable()); return !has(JSPROP_PERMANENT); }

    bool hasEnumerable() const { return !has(JSPROP_IGNORE_ENUMERATE); }
    bool enumerable() const { MOZ_ASSERT(hasEnumerable()); return has(JSPROP_ENUMERATE); }

    bool hasValue() const { return !isAccessorDescriptor() && !has(JSPROP_IGNORE_VALUE); }
    JS::HandleValue value() const {
        return JS::HandleValue::fromMarkedLocation(&desc().value);
    }

    bool hasWritable() const { return !isAccessorDescriptor() && !has(JSPROP_IGNORE_READONLY); }
    bool writable() const { MOZ_ASSERT(hasWritable()); return !has(JSPROP_READONLY); }

    bool hasGetterObject() const { return has(JSPROP_GETTER); }
    JS::HandleObject getterObject() const {
        MOZ_ASSERT(hasGetterObject());
        return JS::HandleObject::fromMarkedLocation(
                reinterpret_cast<JSObject* const*>(&desc().getter));
    }
    bool hasSetterObject() const { return has(JSPROP_SETTER); }
    JS::HandleObject setterObject() const {
        MOZ_ASSERT(hasSetterObject());
        return JS::HandleObject::fromMarkedLocation(
                reinterpret_cast<JSObject* const*>(&desc().setter));
    }

    bool hasGetterOrSetter() const { return desc().getter || desc().setter; }
    bool isShared() const { return has(JSPROP_SHARED); }

    JS::HandleObject object() const {
        return JS::HandleObject::fromMarkedLocation(&desc().obj);
    }
    unsigned attributes() const { return desc().attrs; }
    JSGetterOp getter() const { return desc().getter; }
    JSSetterOp setter() const { return desc().setter; }

    void assertValid() const {
#ifdef DEBUG
        MOZ_ASSERT((attributes() & ~(JSPROP_ENUMERATE | JSPROP_IGNORE_ENUMERATE |
                                     JSPROP_PERMANENT | JSPROP_IGNORE_PERMANENT |
                                     JSPROP_READONLY | JSPROP_IGNORE_READONLY |
                                     JSPROP_IGNORE_VALUE |
                                     JSPROP_GETTER |
                                     JSPROP_SETTER |
                                     JSPROP_SHARED |
                                     JSPROP_REDEFINE_NONCONFIGURABLE |
                                     JSPROP_RESOLVING |
                                     SHADOWABLE)) == 0);
        MOZ_ASSERT(!hasAll(JSPROP_IGNORE_ENUMERATE | JSPROP_ENUMERATE));
        MOZ_ASSERT(!hasAll(JSPROP_IGNORE_PERMANENT | JSPROP_PERMANENT));
        if (isAccessorDescriptor()) {
            MOZ_ASSERT(has(JSPROP_SHARED));
            MOZ_ASSERT(!has(JSPROP_READONLY));
            MOZ_ASSERT(!has(JSPROP_IGNORE_READONLY));
            MOZ_ASSERT(!has(JSPROP_IGNORE_VALUE));
            MOZ_ASSERT(!has(SHADOWABLE));
            MOZ_ASSERT(value().isUndefined());
            MOZ_ASSERT_IF(!has(JSPROP_GETTER), !getter());
            MOZ_ASSERT_IF(!has(JSPROP_SETTER), !setter());
        } else {
            MOZ_ASSERT(!hasAll(JSPROP_IGNORE_READONLY | JSPROP_READONLY));
            MOZ_ASSERT_IF(has(JSPROP_IGNORE_VALUE), value().isUndefined());
        }
        MOZ_ASSERT(getter() != JS_PropertyStub);
        MOZ_ASSERT(setter() != JS_StrictPropertyStub);

        MOZ_ASSERT_IF(has(JSPROP_RESOLVING), !has(JSPROP_IGNORE_ENUMERATE));
        MOZ_ASSERT_IF(has(JSPROP_RESOLVING), !has(JSPROP_IGNORE_PERMANENT));
        MOZ_ASSERT_IF(has(JSPROP_RESOLVING), !has(JSPROP_IGNORE_READONLY));
        MOZ_ASSERT_IF(has(JSPROP_RESOLVING), !has(JSPROP_IGNORE_VALUE));
        MOZ_ASSERT_IF(has(JSPROP_RESOLVING), !has(JSPROP_REDEFINE_NONCONFIGURABLE));
#endif
    }

    void assertComplete() const {
#ifdef DEBUG
        assertValid();
        MOZ_ASSERT((attributes() & ~(JSPROP_ENUMERATE |
                                     JSPROP_PERMANENT |
                                     JSPROP_READONLY |
                                     JSPROP_GETTER |
                                     JSPROP_SETTER |
                                     JSPROP_SHARED |
                                     JSPROP_REDEFINE_NONCONFIGURABLE |
                                     JSPROP_RESOLVING |
                                     SHADOWABLE)) == 0);
        MOZ_ASSERT_IF(isAccessorDescriptor(), has(JSPROP_GETTER) && has(JSPROP_SETTER));
#endif
    }

    void assertCompleteIfFound() const {
#ifdef DEBUG
        if (object())
            assertComplete();
#endif
    }
};

template <typename Outer>
class MutablePropertyDescriptorOperations : public PropertyDescriptorOperations<Outer>
{
    PropertyDescriptor& desc() { return static_cast<Outer*>(this)->get(); }

  public:
    void clear() {
        object().set(nullptr);
        setAttributes(0);
        setGetter(nullptr);
        setSetter(nullptr);
        value().setUndefined();
    }

    void initFields(HandleObject obj, HandleValue v, unsigned attrs,
                    JSGetterOp getterOp, JSSetterOp setterOp) {
        MOZ_ASSERT(getterOp != JS_PropertyStub);
        MOZ_ASSERT(setterOp != JS_StrictPropertyStub);

        object().set(obj);
        value().set(v);
        setAttributes(attrs);
        setGetter(getterOp);
        setSetter(setterOp);
    }

    void assign(PropertyDescriptor& other) {
        object().set(other.obj);
        setAttributes(other.attrs);
        setGetter(other.getter);
        setSetter(other.setter);
        value().set(other.value);
    }

    void setDataDescriptor(HandleValue v, unsigned attrs) {
        MOZ_ASSERT((attrs & ~(JSPROP_ENUMERATE |
                              JSPROP_PERMANENT |
                              JSPROP_READONLY |
                              JSPROP_IGNORE_ENUMERATE |
                              JSPROP_IGNORE_PERMANENT |
                              JSPROP_IGNORE_READONLY)) == 0);
        object().set(nullptr);
        setAttributes(attrs);
        setGetter(nullptr);
        setSetter(nullptr);
        value().set(v);
    }

    JS::MutableHandleObject object() {
        return JS::MutableHandleObject::fromMarkedLocation(&desc().obj);
    }
    unsigned& attributesRef() { return desc().attrs; }
    JSGetterOp& getter() { return desc().getter; }
    JSSetterOp& setter() { return desc().setter; }
    JS::MutableHandleValue value() {
        return JS::MutableHandleValue::fromMarkedLocation(&desc().value);
    }
    void setValue(JS::HandleValue v) {
        MOZ_ASSERT(!(desc().attrs & (JSPROP_GETTER | JSPROP_SETTER)));
        attributesRef() &= ~JSPROP_IGNORE_VALUE;
        value().set(v);
    }

    void setConfigurable(bool configurable) {
        setAttributes((desc().attrs & ~(JSPROP_IGNORE_PERMANENT | JSPROP_PERMANENT)) |
                      (configurable ? 0 : JSPROP_PERMANENT));
    }
    void setEnumerable(bool enumerable) {
        setAttributes((desc().attrs & ~(JSPROP_IGNORE_ENUMERATE | JSPROP_ENUMERATE)) |
                      (enumerable ? JSPROP_ENUMERATE : 0));
    }
    void setWritable(bool writable) {
        MOZ_ASSERT(!(desc().attrs & (JSPROP_GETTER | JSPROP_SETTER)));
        setAttributes((desc().attrs & ~(JSPROP_IGNORE_READONLY | JSPROP_READONLY)) |
                      (writable ? 0 : JSPROP_READONLY));
    }
    void setAttributes(unsigned attrs) { desc().attrs = attrs; }

    void setGetter(JSGetterOp op) {
        MOZ_ASSERT(op != JS_PropertyStub);
        desc().getter = op;
    }
    void setSetter(JSSetterOp op) {
        MOZ_ASSERT(op != JS_StrictPropertyStub);
        desc().setter = op;
    }
    void setGetterObject(JSObject* obj) {
        desc().getter = reinterpret_cast<JSGetterOp>(obj);
        desc().attrs &= ~(JSPROP_IGNORE_VALUE | JSPROP_IGNORE_READONLY | JSPROP_READONLY);
        desc().attrs |= JSPROP_GETTER | JSPROP_SHARED;
    }
    void setSetterObject(JSObject* obj) {
        desc().setter = reinterpret_cast<JSSetterOp>(obj);
        desc().attrs &= ~(JSPROP_IGNORE_VALUE | JSPROP_IGNORE_READONLY | JSPROP_READONLY);
        desc().attrs |= JSPROP_SETTER | JSPROP_SHARED;
    }

    JS::MutableHandleObject getterObject() {
        MOZ_ASSERT(this->hasGetterObject());
        return JS::MutableHandleObject::fromMarkedLocation(
                reinterpret_cast<JSObject**>(&desc().getter));
    }
    JS::MutableHandleObject setterObject() {
        MOZ_ASSERT(this->hasSetterObject());
        return JS::MutableHandleObject::fromMarkedLocation(
                reinterpret_cast<JSObject**>(&desc().setter));
    }
};

} /* namespace JS */

namespace js {

template <>
class RootedBase<JS::PropertyDescriptor>
  : public JS::MutablePropertyDescriptorOperations<JS::Rooted<JS::PropertyDescriptor>>
{};

template <>
class HandleBase<JS::PropertyDescriptor>
  : public JS::PropertyDescriptorOperations<JS::Handle<JS::PropertyDescriptor>>
{};

template <>
class MutableHandleBase<JS::PropertyDescriptor>
  : public JS::MutablePropertyDescriptorOperations<JS::MutableHandle<JS::PropertyDescriptor>>
{};

} /* namespace js */

namespace JS {

extern JS_PUBLIC_API(bool)
ObjectToCompletePropertyDescriptor(JSContext* cx,
                                   JS::HandleObject obj,
                                   JS::HandleValue descriptor,
                                   JS::MutableHandle<PropertyDescriptor> desc);

/*
 * ES6 draft rev 32 (2015 Feb 2) 6.2.4.4 FromPropertyDescriptor(Desc).
 *
 * If desc.object() is null, then vp is set to undefined.
 */
extern JS_PUBLIC_API(bool)
FromPropertyDescriptor(JSContext* cx,
                       JS::Handle<JS::PropertyDescriptor> desc,
                       JS::MutableHandleValue vp);

} // namespace JS


/*** Standard internal methods ********************************************************************
 *
 * The functions below are the fundamental operations on objects.
 *
 * ES6 specifies 14 internal methods that define how objects behave.  The
 * standard is actually quite good on this topic, though you may have to read
 * it a few times. See ES6 sections 6.1.7.2 and 6.1.7.3.
 *
 * When 'obj' is an ordinary object, these functions have boring standard
 * behavior as specified by ES6 section 9.1; see the section about internal
 * methods in js/src/vm/NativeObject.h.
 *
 * Proxies override the behavior of internal methods. So when 'obj' is a proxy,
 * any one of the functions below could do just about anything. See
 * js/public/Proxy.h.
 */

/**
 * Get the prototype of obj, storing it in result.
 *
 * Implements: ES6 [[GetPrototypeOf]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_GetPrototype(JSContext* cx, JS::HandleObject obj, JS::MutableHandleObject result);

/**
 * If |obj| (underneath any functionally-transparent wrapper proxies) has as
 * its [[GetPrototypeOf]] trap the ordinary [[GetPrototypeOf]] behavior defined
 * for ordinary objects, set |*isOrdinary = true| and store |obj|'s prototype
 * in |result|.  Otherwise set |*isOrdinary = false|.  In case of error, both
 * outparams have unspecified value.
 */
extern JS_PUBLIC_API(bool)
JS_GetPrototypeIfOrdinary(JSContext* cx, JS::HandleObject obj, bool* isOrdinary,
                          JS::MutableHandleObject result);

/**
 * Change the prototype of obj.
 *
 * Implements: ES6 [[SetPrototypeOf]] internal method.
 *
 * In cases where ES6 [[SetPrototypeOf]] returns false without an exception,
 * JS_SetPrototype throws a TypeError and returns false.
 *
 * Performance warning: JS_SetPrototype is very bad for performance. It may
 * cause compiled jit-code to be invalidated. It also causes not only obj but
 * all other objects in the same "group" as obj to be permanently deoptimized.
 * It's better to create the object with the right prototype from the start.
 */
extern JS_PUBLIC_API(bool)
JS_SetPrototype(JSContext* cx, JS::HandleObject obj, JS::HandleObject proto);

/**
 * Determine whether obj is extensible. Extensible objects can have new
 * properties defined on them. Inextensible objects can't, and their
 * [[Prototype]] slot is fixed as well.
 *
 * Implements: ES6 [[IsExtensible]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_IsExtensible(JSContext* cx, JS::HandleObject obj, bool* extensible);

/**
 * Attempt to make |obj| non-extensible.
 *
 * Not all failures are treated as errors. See the comment on
 * JS::ObjectOpResult in js/public/Class.h.
 *
 * Implements: ES6 [[PreventExtensions]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_PreventExtensions(JSContext* cx, JS::HandleObject obj, JS::ObjectOpResult& result);

/**
 * Attempt to make the [[Prototype]] of |obj| immutable, such that any attempt
 * to modify it will fail.  If an error occurs during the attempt, return false
 * (with a pending exception set, depending upon the nature of the error).  If
 * no error occurs, return true with |*succeeded| set to indicate whether the
 * attempt successfully made the [[Prototype]] immutable.
 *
 * This is a nonstandard internal method.
 */
extern JS_PUBLIC_API(bool)
JS_SetImmutablePrototype(JSContext* cx, JS::HandleObject obj, bool* succeeded);

/**
 * Get a description of one of obj's own properties. If no such property exists
 * on obj, return true with desc.object() set to null.
 *
 * Implements: ES6 [[GetOwnProperty]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptorById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                                JS::MutableHandle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptor(JSContext* cx, JS::HandleObject obj, const char* name,
                            JS::MutableHandle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_GetOwnUCPropertyDescriptor(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                              JS::MutableHandle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_GetOwnElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::MutableHandleValue vp);

/**
 * Like JS_GetOwnPropertyDescriptorById, but also searches the prototype chain
 * if no own property is found directly on obj. The object on which the
 * property is found is returned in desc.object(). If the property is not found
 * on the prototype chain, this returns true with desc.object() set to null.
 */
extern JS_PUBLIC_API(bool)
JS_GetPropertyDescriptorById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                             JS::MutableHandle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_GetPropertyDescriptor(JSContext* cx, JS::HandleObject obj, const char* name,
                         JS::MutableHandle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_GetUCPropertyDescriptor(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                           JS::MutableHandle<JS::PropertyDescriptor> desc);

/**
 * Define a property on obj.
 *
 * This function uses JS::ObjectOpResult to indicate conditions that ES6
 * specifies as non-error failures. This is inconvenient at best, so use this
 * function only if you are implementing a proxy handler's defineProperty()
 * method. For all other purposes, use one of the many DefineProperty functions
 * below that throw an exception in all failure cases.
 *
 * Implements: ES6 [[DefineOwnProperty]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                      JS::Handle<JS::PropertyDescriptor> desc,
                      JS::ObjectOpResult& result);

/**
 * Define a property on obj, throwing a TypeError if the attempt fails.
 * This is the C++ equivalent of `Object.defineProperty(obj, id, desc)`.
 */
extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                      JS::Handle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, JS::HandleObject value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, JS::HandleString value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, int32_t value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, uint32_t value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, double value,
                      unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, JS::HandleValue value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, JS::HandleObject value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, JS::HandleString value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, int32_t value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, uint32_t value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, JS::HandleObject obj, const char* name, double value,
                  unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::Handle<JS::PropertyDescriptor> desc,
                    JS::ObjectOpResult& result);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::Handle<JS::PropertyDescriptor> desc);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::HandleValue value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::HandleObject value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::HandleString value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    int32_t value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    uint32_t value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    double value, unsigned attrs,
                    JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleValue value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleObject value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleString value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, int32_t value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, uint32_t value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

extern JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, JS::HandleObject obj, uint32_t index, double value,
                 unsigned attrs, JSNative getter = nullptr, JSNative setter = nullptr);

/**
 * Compute the expression `id in obj`.
 *
 * If obj has an own or inherited property obj[id], set *foundp = true and
 * return true. If not, set *foundp = false and return true. On error, return
 * false with an exception pending.
 *
 * Implements: ES6 [[Has]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_HasPropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* foundp);

extern JS_PUBLIC_API(bool)
JS_HasProperty(JSContext* cx, JS::HandleObject obj, const char* name, bool* foundp);

extern JS_PUBLIC_API(bool)
JS_HasUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                 bool* vp);

extern JS_PUBLIC_API(bool)
JS_HasElement(JSContext* cx, JS::HandleObject obj, uint32_t index, bool* foundp);

/**
 * Determine whether obj has an own property with the key `id`.
 *
 * Implements: ES6 7.3.11 HasOwnProperty(O, P).
 */
extern JS_PUBLIC_API(bool)
JS_HasOwnPropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* foundp);

extern JS_PUBLIC_API(bool)
JS_HasOwnProperty(JSContext* cx, JS::HandleObject obj, const char* name, bool* foundp);

/**
 * Get the value of the property `obj[id]`, or undefined if no such property
 * exists. This is the C++ equivalent of `vp = Reflect.get(obj, id, receiver)`.
 *
 * Most callers don't need the `receiver` argument. Consider using
 * JS_GetProperty instead. (But if you're implementing a proxy handler's set()
 * method, it's often correct to call this function and pass the receiver
 * through.)
 *
 * Implements: ES6 [[Get]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_ForwardGetPropertyTo(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                        JS::HandleValue receiver, JS::MutableHandleValue vp);

extern JS_PUBLIC_API(bool)
JS_ForwardGetElementTo(JSContext* cx, JS::HandleObject obj, uint32_t index,
                       JS::HandleObject receiver, JS::MutableHandleValue vp);

/**
 * Get the value of the property `obj[id]`, or undefined if no such property
 * exists. The result is stored in vp.
 *
 * Implements: ES6 7.3.1 Get(O, P).
 */
extern JS_PUBLIC_API(bool)
JS_GetPropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                   JS::MutableHandleValue vp);

extern JS_PUBLIC_API(bool)
JS_GetProperty(JSContext* cx, JS::HandleObject obj, const char* name, JS::MutableHandleValue vp);

extern JS_PUBLIC_API(bool)
JS_GetUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                 JS::MutableHandleValue vp);

extern JS_PUBLIC_API(bool)
JS_GetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::MutableHandleValue vp);

/**
 * Perform the same property assignment as `Reflect.set(obj, id, v, receiver)`.
 *
 * This function has a `receiver` argument that most callers don't need.
 * Consider using JS_SetProperty instead.
 *
 * Implements: ES6 [[Set]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_ForwardSetPropertyTo(JSContext* cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue v,
                        JS::HandleValue receiver, JS::ObjectOpResult& result);

/**
 * Perform the assignment `obj[id] = v`.
 *
 * This function performs non-strict assignment, so if the property is
 * read-only, nothing happens and no error is thrown.
 */
extern JS_PUBLIC_API(bool)
JS_SetPropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue v);

extern JS_PUBLIC_API(bool)
JS_SetProperty(JSContext* cx, JS::HandleObject obj, const char* name, JS::HandleValue v);

extern JS_PUBLIC_API(bool)
JS_SetUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                 JS::HandleValue v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleValue v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleObject v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::HandleString v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, int32_t v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, uint32_t v);

extern JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, JS::HandleObject obj, uint32_t index, double v);

/**
 * Delete a property. This is the C++ equivalent of
 * `result = Reflect.deleteProperty(obj, id)`.
 *
 * This function has a `result` out parameter that most callers don't need.
 * Unless you can pass through an ObjectOpResult provided by your caller, it's
 * probably best to use the JS_DeletePropertyById signature with just 3
 * arguments.
 *
 * Implements: ES6 [[Delete]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_DeletePropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                      JS::ObjectOpResult& result);

extern JS_PUBLIC_API(bool)
JS_DeleteProperty(JSContext* cx, JS::HandleObject obj, const char* name,
                  JS::ObjectOpResult& result);

extern JS_PUBLIC_API(bool)
JS_DeleteUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name, size_t namelen,
                    JS::ObjectOpResult& result);

extern JS_PUBLIC_API(bool)
JS_DeleteElement(JSContext* cx, JS::HandleObject obj, uint32_t index, JS::ObjectOpResult& result);

/**
 * Delete a property, ignoring strict failures. This is the C++ equivalent of
 * the JS `delete obj[id]` in non-strict mode code.
 */
extern JS_PUBLIC_API(bool)
JS_DeletePropertyById(JSContext* cx, JS::HandleObject obj, jsid id);

extern JS_PUBLIC_API(bool)
JS_DeleteProperty(JSContext* cx, JS::HandleObject obj, const char* name);

extern JS_PUBLIC_API(bool)
JS_DeleteElement(JSContext* cx, JS::HandleObject obj, uint32_t index);

/**
 * Get an array of the non-symbol enumerable properties of obj.
 * This function is roughly equivalent to:
 *
 *     var result = [];
 *     for (key in obj)
 *         result.push(key);
 *     return result;
 *
 * This is the closest thing we currently have to the ES6 [[Enumerate]]
 * internal method.
 *
 * The array of ids returned by JS_Enumerate must be rooted to protect its
 * contents from garbage collection. Use JS::Rooted<JS::IdVector>.
 */
extern JS_PUBLIC_API(bool)
JS_Enumerate(JSContext* cx, JS::HandleObject obj, JS::MutableHandle<JS::IdVector> props);

/*
 * API for determining callability and constructability. [[Call]] and
 * [[Construct]] are internal methods that aren't present on all objects, so it
 * is useful to ask if they are there or not. The standard itself asks these
 * questions routinely.
 */
namespace JS {

/**
 * Return true if the given object is callable. In ES6 terms, an object is
 * callable if it has a [[Call]] internal method.
 *
 * Implements: ES6 7.2.3 IsCallable(argument).
 *
 * Functions are callable. A scripted proxy or wrapper is callable if its
 * target is callable. Most other objects aren't callable.
 */
extern JS_PUBLIC_API(bool)
IsCallable(JSObject* obj);

/**
 * Return true if the given object is a constructor. In ES6 terms, an object is
 * a constructor if it has a [[Construct]] internal method. The expression
 * `new obj()` throws a TypeError if obj is not a constructor.
 *
 * Implements: ES6 7.2.4 IsConstructor(argument).
 *
 * JS functions and classes are constructors. Arrow functions and most builtin
 * functions are not. A scripted proxy or wrapper is a constructor if its
 * target is a constructor.
 */
extern JS_PUBLIC_API(bool)
IsConstructor(JSObject* obj);

} /* namespace JS */

/**
 * Call a function, passing a this-value and arguments. This is the C++
 * equivalent of `rval = Reflect.apply(fun, obj, args)`.
 *
 * Implements: ES6 7.3.12 Call(F, V, [argumentsList]).
 * Use this function to invoke the [[Call]] internal method.
 */
extern JS_PUBLIC_API(bool)
JS_CallFunctionValue(JSContext* cx, JS::HandleObject obj, JS::HandleValue fval,
                     const JS::HandleValueArray& args, JS::MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
JS_CallFunction(JSContext* cx, JS::HandleObject obj, JS::HandleFunction fun,
                const JS::HandleValueArray& args, JS::MutableHandleValue rval);

/**
 * Perform the method call `rval = obj[name](args)`.
 */
extern JS_PUBLIC_API(bool)
JS_CallFunctionName(JSContext* cx, JS::HandleObject obj, const char* name,
                    const JS::HandleValueArray& args, JS::MutableHandleValue rval);

namespace JS {

static inline bool
Call(JSContext* cx, JS::HandleObject thisObj, JS::HandleFunction fun,
     const JS::HandleValueArray& args, MutableHandleValue rval)
{
    return !!JS_CallFunction(cx, thisObj, fun, args, rval);
}

static inline bool
Call(JSContext* cx, JS::HandleObject thisObj, JS::HandleValue fun, const JS::HandleValueArray& args,
     MutableHandleValue rval)
{
    return !!JS_CallFunctionValue(cx, thisObj, fun, args, rval);
}

static inline bool
Call(JSContext* cx, JS::HandleObject thisObj, const char* name, const JS::HandleValueArray& args,
     MutableHandleValue rval)
{
    return !!JS_CallFunctionName(cx, thisObj, name, args, rval);
}

extern JS_PUBLIC_API(bool)
Call(JSContext* cx, JS::HandleValue thisv, JS::HandleValue fun, const JS::HandleValueArray& args,
     MutableHandleValue rval);

static inline bool
Call(JSContext* cx, JS::HandleValue thisv, JS::HandleObject funObj, const JS::HandleValueArray& args,
     MutableHandleValue rval)
{
    MOZ_ASSERT(funObj);
    JS::RootedValue fun(cx, JS::ObjectValue(*funObj));
    return Call(cx, thisv, fun, args, rval);
}

/**
 * Invoke a constructor. This is the C++ equivalent of
 * `rval = Reflect.construct(fun, args, newTarget)`.
 *
 * JS::Construct() takes a `newTarget` argument that most callers don't need.
 * Consider using the four-argument Construct signature instead. (But if you're
 * implementing a subclass or a proxy handler's construct() method, this is the
 * right function to call.)
 *
 * Implements: ES6 7.3.13 Construct(F, [argumentsList], [newTarget]).
 * Use this function to invoke the [[Construct]] internal method.
 */
extern JS_PUBLIC_API(bool)
Construct(JSContext* cx, JS::HandleValue fun, HandleObject newTarget,
          const JS::HandleValueArray &args, MutableHandleObject objp);

/**
 * Invoke a constructor. This is the C++ equivalent of
 * `rval = new fun(...args)`.
 *
 * Implements: ES6 7.3.13 Construct(F, [argumentsList], [newTarget]), when
 * newTarget is omitted.
 */
extern JS_PUBLIC_API(bool)
Construct(JSContext* cx, JS::HandleValue fun, const JS::HandleValueArray& args,
          MutableHandleObject objp);

} /* namespace JS */

/**
 * Invoke a constructor, like the JS expression `new ctor(...args)`. Returns
 * the new object, or null on error.
 */
extern JS_PUBLIC_API(JSObject*)
JS_New(JSContext* cx, JS::HandleObject ctor, const JS::HandleValueArray& args);


/*** Other property-defining functions ***********************************************************/

extern JS_PUBLIC_API(JSObject*)
JS_DefineObject(JSContext* cx, JS::HandleObject obj, const char* name,
                const JSClass* clasp = nullptr, unsigned attrs = 0);

extern JS_PUBLIC_API(bool)
JS_DefineConstDoubles(JSContext* cx, JS::HandleObject obj, const JSConstDoubleSpec* cds);

extern JS_PUBLIC_API(bool)
JS_DefineConstIntegers(JSContext* cx, JS::HandleObject obj, const JSConstIntegerSpec* cis);

extern JS_PUBLIC_API(bool)
JS_DefineProperties(JSContext* cx, JS::HandleObject obj, const JSPropertySpec* ps);


/* * */

extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnPropertyById(JSContext* cx, JS::HandleObject obj, JS::HandleId id,
                             bool* foundp);

extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnProperty(JSContext* cx, JS::HandleObject obj, const char* name,
                         bool* foundp);

extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnUCProperty(JSContext* cx, JS::HandleObject obj, const char16_t* name,
                           size_t namelen, bool* foundp);

extern JS_PUBLIC_API(bool)
JS_AlreadyHasOwnElement(JSContext* cx, JS::HandleObject obj, uint32_t index, bool* foundp);

extern JS_PUBLIC_API(JSObject*)
JS_NewArrayObject(JSContext* cx, const JS::HandleValueArray& contents);

extern JS_PUBLIC_API(JSObject*)
JS_NewArrayObject(JSContext* cx, size_t length);

/**
 * Returns true and sets |*isArray| indicating whether |value| is an Array
 * object or a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isArray == false| when passed a proxy whose
 * target is an Array, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext* cx, JS::HandleValue value, bool* isArray);

/**
 * Returns true and sets |*isArray| indicating whether |obj| is an Array object
 * or a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isArray == false| when passed a proxy whose
 * target is an Array, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext* cx, JS::HandleObject obj, bool* isArray);

extern JS_PUBLIC_API(bool)
JS_GetArrayLength(JSContext* cx, JS::Handle<JSObject*> obj, uint32_t* lengthp);

extern JS_PUBLIC_API(bool)
JS_SetArrayLength(JSContext* cx, JS::Handle<JSObject*> obj, uint32_t length);

namespace JS {

/**
 * Returns true and sets |*isMap| indicating whether |obj| is an Map object
 * or a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isMap == false| when passed a proxy whose
 * target is an Map, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
IsMapObject(JSContext* cx, JS::HandleObject obj, bool* isMap);

/**
 * Returns true and sets |*isSet| indicating whether |obj| is an Set object
 * or a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isSet == false| when passed a proxy whose
 * target is an Set, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
IsSetObject(JSContext* cx, JS::HandleObject obj, bool* isSet);

} /* namespace JS */

/**
 * Assign 'undefined' to all of the object's non-reserved slots. Note: this is
 * done for all slots, regardless of the associated property descriptor.
 */
JS_PUBLIC_API(void)
JS_SetAllNonReservedSlotsToUndefined(JSContext* cx, JSObject* objArg);

/**
 * Create a new array buffer with the given contents. It must be legal to pass
 * these contents to free(). On success, the ownership is transferred to the
 * new array buffer.
 */
extern JS_PUBLIC_API(JSObject*)
JS_NewArrayBufferWithContents(JSContext* cx, size_t nbytes, void* contents);

/**
 * Create a new array buffer with the given contents.  The array buffer does not take ownership of
 * contents, and JS_DetachArrayBuffer must be called before the contents are disposed of.
 */
extern JS_PUBLIC_API(JSObject*)
JS_NewArrayBufferWithExternalContents(JSContext* cx, size_t nbytes, void* contents);

/**
 * Steal the contents of the given array buffer. The array buffer has its
 * length set to 0 and its contents array cleared. The caller takes ownership
 * of the return value and must free it or transfer ownership via
 * JS_NewArrayBufferWithContents when done using it.
 */
extern JS_PUBLIC_API(void*)
JS_StealArrayBufferContents(JSContext* cx, JS::HandleObject obj);

/**
 * Returns a pointer to the ArrayBuffer |obj|'s data.  |obj| and its views will store and expose
 * the data in the returned pointer: assigning into the returned pointer will affect values exposed
 * by views of |obj| and vice versa.
 *
 * The caller must ultimately deallocate the returned pointer to avoid leaking.  The memory is
 * *not* garbage-collected with |obj|.  These steps must be followed to deallocate:
 *
 * 1. The ArrayBuffer |obj| must be detached using JS_DetachArrayBuffer.
 * 2. The returned pointer must be freed using JS_free.
 *
 * To perform step 1, callers *must* hold a reference to |obj| until they finish using the returned
 * pointer.  They *must not* attempt to let |obj| be GC'd, then JS_free the pointer.
 *
 * If |obj| isn't an ArrayBuffer, this function returns null and reports an error.
 */
extern JS_PUBLIC_API(void*)
JS_ExternalizeArrayBufferContents(JSContext* cx, JS::HandleObject obj);

/**
 * Create a new mapped array buffer with the given memory mapped contents. It
 * must be legal to free the contents pointer by unmapping it. On success,
 * ownership is transferred to the new mapped array buffer.
 */
extern JS_PUBLIC_API(JSObject*)
JS_NewMappedArrayBufferWithContents(JSContext* cx, size_t nbytes, void* contents);

/**
 * Create memory mapped array buffer contents.
 * Caller must take care of closing fd after calling this function.
 */
extern JS_PUBLIC_API(void*)
JS_CreateMappedArrayBufferContents(int fd, size_t offset, size_t length);

/**
 * Release the allocated resource of mapped array buffer contents before the
 * object is created.
 * If a new object has been created by JS_NewMappedArrayBufferWithContents()
 * with this content, then JS_DetachArrayBuffer() should be used instead to
 * release the resource used by the object.
 */
extern JS_PUBLIC_API(void)
JS_ReleaseMappedArrayBufferContents(void* contents, size_t length);

extern JS_PUBLIC_API(JS::Value)
JS_GetReservedSlot(JSObject* obj, uint32_t index);

extern JS_PUBLIC_API(void)
JS_SetReservedSlot(JSObject* obj, uint32_t index, const JS::Value& v);


/************************************************************************/

/*
 * Functions and scripts.
 */
extern JS_PUBLIC_API(JSFunction*)
JS_NewFunction(JSContext* cx, JSNative call, unsigned nargs, unsigned flags,
               const char* name);

namespace JS {

extern JS_PUBLIC_API(JSFunction*)
GetSelfHostedFunction(JSContext* cx, const char* selfHostedName, HandleId id,
                      unsigned nargs);

/**
 * Create a new function based on the given JSFunctionSpec, *fs.
 * id is the result of a successful call to
 * `PropertySpecNameToPermanentId(cx, fs->name, &id)`.
 *
 * Unlike JS_DefineFunctions, this does not treat fs as an array.
 * *fs must not be JS_FS_END.
 */
extern JS_PUBLIC_API(JSFunction*)
NewFunctionFromSpec(JSContext* cx, const JSFunctionSpec* fs, HandleId id);

} /* namespace JS */

extern JS_PUBLIC_API(JSObject*)
JS_GetFunctionObject(JSFunction* fun);

/**
 * Return the function's identifier as a JSString, or null if fun is unnamed.
 * The returned string lives as long as fun, so you don't need to root a saved
 * reference to it if fun is well-connected or rooted, and provided you bound
 * the use of the saved reference by fun's lifetime.
 */
extern JS_PUBLIC_API(JSString*)
JS_GetFunctionId(JSFunction* fun);

/**
 * Return a function's display name. This is the defined name if one was given
 * where the function was defined, or it could be an inferred name by the JS
 * engine in the case that the function was defined to be anonymous. This can
 * still return nullptr if a useful display name could not be inferred. The
 * same restrictions on rooting as those in JS_GetFunctionId apply.
 */
extern JS_PUBLIC_API(JSString*)
JS_GetFunctionDisplayId(JSFunction* fun);

/*
 * Return the arity (length) of fun.
 */
extern JS_PUBLIC_API(uint16_t)
JS_GetFunctionArity(JSFunction* fun);

/**
 * Infallible predicate to test whether obj is a function object (faster than
 * comparing obj's class name to "Function", but equivalent unless someone has
 * overwritten the "Function" identifier with a different constructor and then
 * created instances using that constructor that might be passed in as obj).
 */
extern JS_PUBLIC_API(bool)
JS_ObjectIsFunction(JSContext* cx, JSObject* obj);

extern JS_PUBLIC_API(bool)
JS_IsNativeFunction(JSObject* funobj, JSNative call);

/** Return whether the given function is a valid constructor. */
extern JS_PUBLIC_API(bool)
JS_IsConstructor(JSFunction* fun);

extern JS_PUBLIC_API(bool)
JS_DefineFunctions(JSContext* cx, JS::Handle<JSObject*> obj, const JSFunctionSpec* fs);

extern JS_PUBLIC_API(JSFunction*)
JS_DefineFunction(JSContext* cx, JS::Handle<JSObject*> obj, const char* name, JSNative call,
                  unsigned nargs, unsigned attrs);

extern JS_PUBLIC_API(JSFunction*)
JS_DefineUCFunction(JSContext* cx, JS::Handle<JSObject*> obj,
                    const char16_t* name, size_t namelen, JSNative call,
                    unsigned nargs, unsigned attrs);

extern JS_PUBLIC_API(JSFunction*)
JS_DefineFunctionById(JSContext* cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id, JSNative call,
                      unsigned nargs, unsigned attrs);

extern JS_PUBLIC_API(bool)
JS_IsFunctionBound(JSFunction* fun);

extern JS_PUBLIC_API(JSObject*)
JS_GetBoundFunctionTarget(JSFunction* fun);

namespace JS {

/**
 * Clone a top-level function into cx's global. This function will dynamically
 * fail if funobj was lexically nested inside some other function.
 */
extern JS_PUBLIC_API(JSObject*)
CloneFunctionObject(JSContext* cx, HandleObject funobj);

/**
 * As above, but providing an explicit scope chain.  scopeChain must not include
 * the global object on it; that's implicit.  It needs to contain the other
 * objects that should end up on the clone's scope chain.
 */
extern JS_PUBLIC_API(JSObject*)
CloneFunctionObject(JSContext* cx, HandleObject funobj, AutoObjectVector& scopeChain);

} // namespace JS

/**
 * Given a buffer, return false if the buffer might become a valid
 * javascript statement with the addition of more lines.  Otherwise return
 * true.  The intent is to support interactive compilation - accumulate
 * lines in a buffer until JS_BufferIsCompilableUnit is true, then pass it to
 * the compiler.
 */
extern JS_PUBLIC_API(bool)
JS_BufferIsCompilableUnit(JSContext* cx, JS::Handle<JSObject*> obj, const char* utf8,
                          size_t length);

/**
 * |script| will always be set. On failure, it will be set to nullptr.
 */
extern JS_PUBLIC_API(bool)
JS_CompileScript(JSContext* cx, const char* ascii, size_t length,
                 const JS::CompileOptions& options,
                 JS::MutableHandleScript script);

/**
 * |script| will always be set. On failure, it will be set to nullptr.
 */
extern JS_PUBLIC_API(bool)
JS_CompileUCScript(JSContext* cx, const char16_t* chars, size_t length,
                   const JS::CompileOptions& options,
                   JS::MutableHandleScript script);

extern JS_PUBLIC_API(JSObject*)
JS_GetGlobalFromScript(JSScript* script);

extern JS_PUBLIC_API(const char*)
JS_GetScriptFilename(JSScript* script);

extern JS_PUBLIC_API(unsigned)
JS_GetScriptBaseLineNumber(JSContext* cx, JSScript* script);

extern JS_PUBLIC_API(JSScript*)
JS_GetFunctionScript(JSContext* cx, JS::HandleFunction fun);

namespace JS {

/* Options for JavaScript compilation. */

/*
 * In the most common use case, a CompileOptions instance is allocated on the
 * stack, and holds non-owning references to non-POD option values: strings;
 * principals; objects; and so on. The code declaring the instance guarantees
 * that such option values will outlive the CompileOptions itself: objects are
 * otherwise rooted; principals have had their reference counts bumped; strings
 * will not be freed until the CompileOptions goes out of scope. In this
 * situation, CompileOptions only refers to things others own, so it can be
 * lightweight.
 *
 * In some cases, however, we need to hold compilation options with a
 * non-stack-like lifetime. For example, JS::CompileOffThread needs to save
 * compilation options where a worker thread can find them, and then return
 * immediately. The worker thread will come along at some later point, and use
 * the options.
 *
 * The compiler itself just needs to be able to access a collection of options;
 * it doesn't care who owns them, or what's keeping them alive. It does its own
 * addrefs/copies/tracing/etc.
 *
 * Furthermore, in some cases compile options are propagated from one entity to
 * another (e.g. from a scriipt to a function defined in that script).  This
 * involves copying over some, but not all, of the options.
 *
 * So, we have a class hierarchy that reflects these four use cases:
 *
 * - TransitiveCompileOptions is the common base class, representing options
 *   that should get propagated from a script to functions defined in that
 *   script.  This is never instantiated directly.
 *
 * - ReadOnlyCompileOptions is the only subclass of TransitiveCompileOptions,
 *   representing a full set of compile options.  It can be used by code that
 *   simply needs to access options set elsewhere, like the compiler.  This,
 *   again, is never instantiated directly.
 *
 * - The usual CompileOptions class must be stack-allocated, and holds
 *   non-owning references to the filename, element, and so on. It's derived
 *   from ReadOnlyCompileOptions, so the compiler can use it.
 *
 * - OwningCompileOptions roots / copies / reference counts of all its values,
 *   and unroots / frees / releases them when it is destructed. It too is
 *   derived from ReadOnlyCompileOptions, so the compiler accepts it.
 */

enum class AsmJSOption : uint8_t { Enabled, Disabled, DisabledByDebugger };

/**
 * The common base class for the CompileOptions hierarchy.
 *
 * Use this in code that needs to propagate compile options from one compilation
 * unit to another.
 */
class JS_FRIEND_API(TransitiveCompileOptions)
{
  protected:
    // The Web Platform allows scripts to be loaded from arbitrary cross-origin
    // sources. This allows an attack by which a malicious website loads a
    // sensitive file (say, a bank statement) cross-origin (using the user's
    // cookies), and sniffs the generated syntax errors (via a window.onerror
    // handler) for juicy morsels of its contents.
    //
    // To counter this attack, HTML5 specifies that script errors should be
    // sanitized ("muted") when the script is not same-origin with the global
    // for which it is loaded. Callers should set this flag for cross-origin
    // scripts, and it will be propagated appropriately to child scripts and
    // passed back in JSErrorReports.
    bool mutedErrors_;
    const char* filename_;
    const char* introducerFilename_;
    const char16_t* sourceMapURL_;

    // This constructor leaves 'version' set to JSVERSION_UNKNOWN. The structure
    // is unusable until that's set to something more specific; the derived
    // classes' constructors take care of that, in ways appropriate to their
    // purpose.
    TransitiveCompileOptions()
      : mutedErrors_(false),
        filename_(nullptr),
        introducerFilename_(nullptr),
        sourceMapURL_(nullptr),
        version(JSVERSION_UNKNOWN),
        versionSet(false),
        utf8(false),
        selfHostingMode(false),
        canLazilyParse(true),
        strictOption(false),
        extraWarningsOption(false),
        werrorOption(false),
        asmJSOption(AsmJSOption::Disabled),
        throwOnAsmJSValidationFailureOption(false),
        forceAsync(false),
        installedFile(false),
        sourceIsLazy(false),
        introductionType(nullptr),
        introductionLineno(0),
        introductionOffset(0),
        hasIntroductionInfo(false)
    { }

    // Set all POD options (those not requiring reference counts, copies,
    // rooting, or other hand-holding) to their values in |rhs|.
    void copyPODTransitiveOptions(const TransitiveCompileOptions& rhs);

  public:
    // Read-only accessors for non-POD options. The proper way to set these
    // depends on the derived type.
    bool mutedErrors() const { return mutedErrors_; }
    const char* filename() const { return filename_; }
    const char* introducerFilename() const { return introducerFilename_; }
    const char16_t* sourceMapURL() const { return sourceMapURL_; }
    virtual JSObject* element() const = 0;
    virtual JSString* elementAttributeName() const = 0;
    virtual JSScript* introductionScript() const = 0;

    // POD options.
    JSVersion version;
    bool versionSet;
    bool utf8;
    bool selfHostingMode;
    bool canLazilyParse;
    bool strictOption;
    bool extraWarningsOption;
    bool werrorOption;
    AsmJSOption asmJSOption;
    bool throwOnAsmJSValidationFailureOption;
    bool forceAsync;
    bool installedFile;  // 'true' iff pre-compiling js file in packaged app
    bool sourceIsLazy;

    // |introductionType| is a statically allocated C string:
    // one of "eval", "Function", or "GeneratorFunction".
    const char* introductionType;
    unsigned introductionLineno;
    uint32_t introductionOffset;
    bool hasIntroductionInfo;

  private:
    void operator=(const TransitiveCompileOptions&) = delete;
};

/**
 * The class representing a full set of compile options.
 *
 * Use this in code that only needs to access compilation options created
 * elsewhere, like the compiler. Don't instantiate this class (the constructor
 * is protected anyway); instead, create instances only of the derived classes:
 * CompileOptions and OwningCompileOptions.
 */
class JS_FRIEND_API(ReadOnlyCompileOptions) : public TransitiveCompileOptions
{
    friend class CompileOptions;

  protected:
    ReadOnlyCompileOptions()
      : TransitiveCompileOptions(),
        lineno(1),
        column(0),
        isRunOnce(false),
        noScriptRval(false)
    { }

    // Set all POD options (those not requiring reference counts, copies,
    // rooting, or other hand-holding) to their values in |rhs|.
    void copyPODOptions(const ReadOnlyCompileOptions& rhs);

  public:
    // Read-only accessors for non-POD options. The proper way to set these
    // depends on the derived type.
    bool mutedErrors() const { return mutedErrors_; }
    const char* filename() const { return filename_; }
    const char* introducerFilename() const { return introducerFilename_; }
    const char16_t* sourceMapURL() const { return sourceMapURL_; }
    virtual JSObject* element() const = 0;
    virtual JSString* elementAttributeName() const = 0;
    virtual JSScript* introductionScript() const = 0;

    // POD options.
    unsigned lineno;
    unsigned column;
    // isRunOnce only applies to non-function scripts.
    bool isRunOnce;
    bool noScriptRval;

  private:
    void operator=(const ReadOnlyCompileOptions&) = delete;
};

/**
 * Compilation options, with dynamic lifetime. An instance of this type
 * makes a copy of / holds / roots all dynamically allocated resources
 * (principals; elements; strings) that it refers to. Its destructor frees
 * / drops / unroots them. This is heavier than CompileOptions, below, but
 * unlike CompileOptions, it can outlive any given stack frame.
 *
 * Note that this *roots* any JS values it refers to - they're live
 * unconditionally. Thus, instances of this type can't be owned, directly
 * or indirectly, by a JavaScript object: if any value that this roots ever
 * comes to refer to the object that owns this, then the whole cycle, and
 * anything else it entrains, will never be freed.
 */
class JS_FRIEND_API(OwningCompileOptions) : public ReadOnlyCompileOptions
{
    PersistentRootedObject elementRoot;
    PersistentRootedString elementAttributeNameRoot;
    PersistentRootedScript introductionScriptRoot;

  public:
    // A minimal constructor, for use with OwningCompileOptions::copy. This
    // leaves |this.version| set to JSVERSION_UNKNOWN; the instance
    // shouldn't be used until we've set that to something real (as |copy|
    // will).
    explicit OwningCompileOptions(JSContext* cx);
    ~OwningCompileOptions();

    JSObject* element() const override { return elementRoot; }
    JSString* elementAttributeName() const override { return elementAttributeNameRoot; }
    JSScript* introductionScript() const override { return introductionScriptRoot; }

    // Set this to a copy of |rhs|. Return false on OOM.
    bool copy(JSContext* cx, const ReadOnlyCompileOptions& rhs);

    /* These setters make copies of their string arguments, and are fallible. */
    bool setFile(JSContext* cx, const char* f);
    bool setFileAndLine(JSContext* cx, const char* f, unsigned l);
    bool setSourceMapURL(JSContext* cx, const char16_t* s);
    bool setIntroducerFilename(JSContext* cx, const char* s);

    /* These setters are infallible, and can be chained. */
    OwningCompileOptions& setLine(unsigned l)             { lineno = l; return *this; }
    OwningCompileOptions& setElement(JSObject* e) {
        elementRoot = e;
        return *this;
    }
    OwningCompileOptions& setElementAttributeName(JSString* p) {
        elementAttributeNameRoot = p;
        return *this;
    }
    OwningCompileOptions& setIntroductionScript(JSScript* s) {
        introductionScriptRoot = s;
        return *this;
    }
    OwningCompileOptions& setMutedErrors(bool mute) {
        mutedErrors_ = mute;
        return *this;
    }
    OwningCompileOptions& setVersion(JSVersion v) {
        version = v;
        versionSet = true;
        return *this;
    }
    OwningCompileOptions& setUTF8(bool u) { utf8 = u; return *this; }
    OwningCompileOptions& setColumn(unsigned c) { column = c; return *this; }
    OwningCompileOptions& setIsRunOnce(bool once) { isRunOnce = once; return *this; }
    OwningCompileOptions& setNoScriptRval(bool nsr) { noScriptRval = nsr; return *this; }
    OwningCompileOptions& setSelfHostingMode(bool shm) { selfHostingMode = shm; return *this; }
    OwningCompileOptions& setCanLazilyParse(bool clp) { canLazilyParse = clp; return *this; }
    OwningCompileOptions& setSourceIsLazy(bool l) { sourceIsLazy = l; return *this; }
    OwningCompileOptions& setIntroductionType(const char* t) { introductionType = t; return *this; }
    bool setIntroductionInfo(JSContext* cx, const char* introducerFn, const char* intro,
                             unsigned line, JSScript* script, uint32_t offset)
    {
        if (!setIntroducerFilename(cx, introducerFn))
            return false;
        introductionType = intro;
        introductionLineno = line;
        introductionScriptRoot = script;
        introductionOffset = offset;
        hasIntroductionInfo = true;
        return true;
    }

  private:
    void operator=(const CompileOptions& rhs) = delete;
};

/**
 * Compilation options stored on the stack. An instance of this type
 * simply holds references to dynamically allocated resources (element;
 * filename; source map URL) that are owned by something else. If you
 * create an instance of this type, it's up to you to guarantee that
 * everything you store in it will outlive it.
 */
class MOZ_STACK_CLASS JS_FRIEND_API(CompileOptions) final : public ReadOnlyCompileOptions
{
    RootedObject elementRoot;
    RootedString elementAttributeNameRoot;
    RootedScript introductionScriptRoot;

  public:
    explicit CompileOptions(JSContext* cx, JSVersion version = JSVERSION_UNKNOWN);
    CompileOptions(js::ContextFriendFields* cx, const ReadOnlyCompileOptions& rhs)
      : ReadOnlyCompileOptions(), elementRoot(cx), elementAttributeNameRoot(cx),
        introductionScriptRoot(cx)
    {
        copyPODOptions(rhs);

        filename_ = rhs.filename();
        introducerFilename_ = rhs.introducerFilename();
        sourceMapURL_ = rhs.sourceMapURL();
        elementRoot = rhs.element();
        elementAttributeNameRoot = rhs.elementAttributeName();
        introductionScriptRoot = rhs.introductionScript();
    }

    CompileOptions(js::ContextFriendFields* cx, const TransitiveCompileOptions& rhs)
      : ReadOnlyCompileOptions(), elementRoot(cx), elementAttributeNameRoot(cx),
        introductionScriptRoot(cx)
    {
        copyPODTransitiveOptions(rhs);

        filename_ = rhs.filename();
        introducerFilename_ = rhs.introducerFilename();
        sourceMapURL_ = rhs.sourceMapURL();
        elementRoot = rhs.element();
        elementAttributeNameRoot = rhs.elementAttributeName();
        introductionScriptRoot = rhs.introductionScript();
    }

    JSObject* element() const override { return elementRoot; }
    JSString* elementAttributeName() const override { return elementAttributeNameRoot; }
    JSScript* introductionScript() const override { return introductionScriptRoot; }

    CompileOptions& setFile(const char* f) { filename_ = f; return *this; }
    CompileOptions& setLine(unsigned l) { lineno = l; return *this; }
    CompileOptions& setFileAndLine(const char* f, unsigned l) {
        filename_ = f; lineno = l; return *this;
    }
    CompileOptions& setSourceMapURL(const char16_t* s) { sourceMapURL_ = s; return *this; }
    CompileOptions& setElement(JSObject* e)          { elementRoot = e; return *this; }
    CompileOptions& setElementAttributeName(JSString* p) {
        elementAttributeNameRoot = p;
        return *this;
    }
    CompileOptions& setIntroductionScript(JSScript* s) {
        introductionScriptRoot = s;
        return *this;
    }
    CompileOptions& setMutedErrors(bool mute) {
        mutedErrors_ = mute;
        return *this;
    }
    CompileOptions& setVersion(JSVersion v) {
        version = v;
        versionSet = true;
        return *this;
    }
    CompileOptions& setUTF8(bool u) { utf8 = u; return *this; }
    CompileOptions& setColumn(unsigned c) { column = c; return *this; }
    CompileOptions& setIsRunOnce(bool once) { isRunOnce = once; return *this; }
    CompileOptions& setNoScriptRval(bool nsr) { noScriptRval = nsr; return *this; }
    CompileOptions& setSelfHostingMode(bool shm) { selfHostingMode = shm; return *this; }
    CompileOptions& setCanLazilyParse(bool clp) { canLazilyParse = clp; return *this; }
    CompileOptions& setSourceIsLazy(bool l) { sourceIsLazy = l; return *this; }
    CompileOptions& setIntroductionType(const char* t) { introductionType = t; return *this; }
    CompileOptions& setIntroductionInfo(const char* introducerFn, const char* intro,
                                        unsigned line, JSScript* script, uint32_t offset)
    {
        introducerFilename_ = introducerFn;
        introductionType = intro;
        introductionLineno = line;
        introductionScriptRoot = script;
        introductionOffset = offset;
        hasIntroductionInfo = true;
        return *this;
    }
    CompileOptions& maybeMakeStrictMode(bool strict) {
        strictOption = strictOption || strict;
        return *this;
    }

  private:
    void operator=(const CompileOptions& rhs) = delete;
};

/**
 * |script| will always be set. On failure, it will be set to nullptr.
 */
extern JS_PUBLIC_API(bool)
Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
        SourceBufferHolder& srcBuf, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
        const char* bytes, size_t length, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
        const char16_t* chars, size_t length, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
        FILE* file, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
        const char* filename, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
                            SourceBufferHolder& srcBuf, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
                            const char* bytes, size_t length, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
                            const char16_t* chars, size_t length, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
                            FILE* file, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
                            const char* filename, JS::MutableHandleScript script);

extern JS_PUBLIC_API(bool)
CanCompileOffThread(JSContext* cx, const ReadOnlyCompileOptions& options, size_t length);

/*
 * Off thread compilation control flow.
 *
 * After successfully triggering an off thread compile of a script, the
 * callback will eventually be invoked with the specified data and a token
 * for the compilation. The callback will be invoked while off the main thread,
 * so must ensure that its operations are thread safe. Afterwards, one of the
 * following functions must be invoked on the main thread:
 *
 * - FinishOffThreadScript, to get the result script (or nullptr on failure).
 * - CancelOffThreadScript, to free the resources without creating a script.
 *
 * The characters passed in to CompileOffThread must remain live until the
 * callback is invoked, and the resulting script will be rooted until the call
 * to FinishOffThreadScript.
 */

extern JS_PUBLIC_API(bool)
CompileOffThread(JSContext* cx, const ReadOnlyCompileOptions& options,
                 const char16_t* chars, size_t length,
                 OffThreadCompileCallback callback, void* callbackData);

extern JS_PUBLIC_API(JSScript*)
FinishOffThreadScript(JSContext* cx, void* token);

extern JS_PUBLIC_API(void)
CancelOffThreadScript(JSContext* cx, void* token);

extern JS_PUBLIC_API(bool)
CompileOffThreadModule(JSContext* cx, const ReadOnlyCompileOptions& options,
                       const char16_t* chars, size_t length,
                       OffThreadCompileCallback callback, void* callbackData);

extern JS_PUBLIC_API(JSObject*)
FinishOffThreadModule(JSContext* cx, void* token);

extern JS_PUBLIC_API(void)
CancelOffThreadModule(JSContext* cx, void* token);

/**
 * Compile a function with envChain plus the global as its scope chain.
 * envChain must contain objects in the current compartment of cx.  The actual
 * scope chain used for the function will consist of With wrappers for those
 * objects, followed by the current global of the compartment cx is in.  This
 * global must not be explicitly included in the scope chain.
 */
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext* cx, AutoObjectVector& envChain,
                const ReadOnlyCompileOptions& options,
                const char* name, unsigned nargs, const char* const* argnames,
                const char16_t* chars, size_t length, JS::MutableHandleFunction fun);

/**
 * Same as above, but taking a SourceBufferHolder for the function body.
 */
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext* cx, AutoObjectVector& envChain,
                const ReadOnlyCompileOptions& options,
                const char* name, unsigned nargs, const char* const* argnames,
                SourceBufferHolder& srcBuf, JS::MutableHandleFunction fun);

/**
 * Same as above, but taking a const char * for the function body.
 */
extern JS_PUBLIC_API(bool)
CompileFunction(JSContext* cx, AutoObjectVector& envChain,
                const ReadOnlyCompileOptions& options,
                const char* name, unsigned nargs, const char* const* argnames,
                const char* bytes, size_t length, JS::MutableHandleFunction fun);

} /* namespace JS */

extern JS_PUBLIC_API(JSString*)
JS_DecompileScript(JSContext* cx, JS::Handle<JSScript*> script, const char* name, unsigned indent);

/*
 * API extension: OR this into indent to avoid pretty-printing the decompiled
 * source resulting from JS_DecompileFunction.
 */
#define JS_DONT_PRETTY_PRINT    ((unsigned)0x8000)

extern JS_PUBLIC_API(JSString*)
JS_DecompileFunction(JSContext* cx, JS::Handle<JSFunction*> fun, unsigned indent);


/*
 * NB: JS_ExecuteScript and the JS::Evaluate APIs come in two flavors: either
 * they use the global as the scope, or they take an AutoObjectVector of objects
 * to use as the scope chain.  In the former case, the global is also used as
 * the "this" keyword value and the variables object (ECMA parlance for where
 * 'var' and 'function' bind names) of the execution context for script.  In the
 * latter case, the first object in the provided list is used, unless the list
 * is empty, in which case the global is used.
 *
 * Why a runtime option?  The alternative is to add APIs duplicating those
 * for the other value of flags, and that doesn't seem worth the code bloat
 * cost.  Such new entry points would probably have less obvious names, too, so
 * would not tend to be used.  The ContextOptionsRef adjustment, OTOH, can be
 * more easily hacked into existing code that does not depend on the bug; such
 * code can continue to use the familiar JS::Evaluate, etc., entry points.
 */

/**
 * Evaluate a script in the scope of the current global of cx.
 */
extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext* cx, JS::HandleScript script, JS::MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext* cx, JS::HandleScript script);

/**
 * As above, but providing an explicit scope chain.  envChain must not include
 * the global object on it; that's implicit.  It needs to contain the other
 * objects that should end up on the script's scope chain.
 */
extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext* cx, JS::AutoObjectVector& envChain,
                 JS::HandleScript script, JS::MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext* cx, JS::AutoObjectVector& envChain, JS::HandleScript script);

namespace JS {

/**
 * Like the above, but handles a cross-compartment script. If the script is
 * cross-compartment, it is cloned into the current compartment before executing.
 */
extern JS_PUBLIC_API(bool)
CloneAndExecuteScript(JSContext* cx, JS::Handle<JSScript*> script,
                      JS::MutableHandleValue rval);

} /* namespace JS */

namespace JS {

/**
 * Evaluate the given source buffer in the scope of the current global of cx.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, const ReadOnlyCompileOptions& options,
         SourceBufferHolder& srcBuf, JS::MutableHandleValue rval);

/**
 * As above, but providing an explicit scope chain.  envChain must not include
 * the global object on it; that's implicit.  It needs to contain the other
 * objects that should end up on the script's scope chain.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, AutoObjectVector& envChain, const ReadOnlyCompileOptions& options,
         SourceBufferHolder& srcBuf, JS::MutableHandleValue rval);

/**
 * Evaluate the given character buffer in the scope of the current global of cx.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, const ReadOnlyCompileOptions& options,
         const char16_t* chars, size_t length, JS::MutableHandleValue rval);

/**
 * As above, but providing an explicit scope chain.  envChain must not include
 * the global object on it; that's implicit.  It needs to contain the other
 * objects that should end up on the script's scope chain.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, AutoObjectVector& envChain, const ReadOnlyCompileOptions& options,
         const char16_t* chars, size_t length, JS::MutableHandleValue rval);

/**
 * Evaluate the given byte buffer in the scope of the current global of cx.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, const ReadOnlyCompileOptions& options,
         const char* bytes, size_t length, JS::MutableHandleValue rval);

/**
 * Evaluate the given file in the scope of the current global of cx.
 */
extern JS_PUBLIC_API(bool)
Evaluate(JSContext* cx, const ReadOnlyCompileOptions& options,
         const char* filename, JS::MutableHandleValue rval);

/**
 * Get the HostResolveImportedModule hook for a global.
 */
extern JS_PUBLIC_API(JSFunction*)
GetModuleResolveHook(JSContext* cx);

/**
 * Set the HostResolveImportedModule hook for a global to the given function.
 */
extern JS_PUBLIC_API(void)
SetModuleResolveHook(JSContext* cx, JS::HandleFunction func);

/**
 * Parse the given source buffer as a module in the scope of the current global
 * of cx and return a source text module record.
 */
extern JS_PUBLIC_API(bool)
CompileModule(JSContext* cx, const ReadOnlyCompileOptions& options,
              SourceBufferHolder& srcBuf, JS::MutableHandleObject moduleRecord);

/**
 * Set the [[HostDefined]] field of a source text module record to the given
 * value.
 */
extern JS_PUBLIC_API(void)
SetModuleHostDefinedField(JSObject* module, const JS::Value& value);

/**
 * Get the [[HostDefined]] field of a source text module record.
 */
extern JS_PUBLIC_API(JS::Value)
GetModuleHostDefinedField(JSObject* module);

/*
 * Perform the ModuleInstantiate operation on the given source text module
 * record.
 *
 * This transitively resolves all module dependencies (calling the
 * HostResolveImportedModule hook) and initializes the environment record for
 * the module.
 */
extern JS_PUBLIC_API(bool)
ModuleInstantiate(JSContext* cx, JS::HandleObject moduleRecord);

/*
 * Perform the ModuleEvaluate operation on the given source text module record.
 *
 * This does nothing if this module has already been evaluated. Otherwise, it
 * transitively evaluates all dependences of this module and then evaluates this
 * module.
 *
 * ModuleInstantiate must have completed prior to calling this.
 */
extern JS_PUBLIC_API(bool)
ModuleEvaluate(JSContext* cx, JS::HandleObject moduleRecord);

/*
 * Get a list of the module specifiers used by a source text module
 * record to request importation of modules.
 *
 * The result is a JavaScript array of string values.  To extract the individual
 * values use only JS_GetArrayLength and JS_GetElement with indices 0 to
 * length - 1.
 */
extern JS_PUBLIC_API(JSObject*)
GetRequestedModules(JSContext* cx, JS::HandleObject moduleRecord);

/*
 * Get the script associated with a module.
 */
extern JS_PUBLIC_API(JSScript*)
GetModuleScript(JSContext* cx, JS::HandleObject moduleRecord);

} /* namespace JS */

extern JS_PUBLIC_API(bool)
JS_CheckForInterrupt(JSContext* cx);

/*
 * These functions allow setting an interrupt callback that will be called
 * from the JS thread some time after any thread triggered the callback using
 * JS_RequestInterruptCallback(cx).
 *
 * To schedule the GC and for other activities the engine internally triggers
 * interrupt callbacks. The embedding should thus not rely on callbacks being
 * triggered through the external API only.
 *
 * Important note: Additional callbacks can occur inside the callback handler
 * if it re-enters the JS engine. The embedding must ensure that the callback
 * is disconnected before attempting such re-entry.
 */
extern JS_PUBLIC_API(bool)
JS_AddInterruptCallback(JSContext* cx, JSInterruptCallback callback);

extern JS_PUBLIC_API(bool)
JS_DisableInterruptCallback(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_ResetInterruptCallback(JSContext* cx, bool enable);

extern JS_PUBLIC_API(void)
JS_RequestInterruptCallback(JSContext* cx);

namespace JS {

/**
 * Sets the callback that's invoked whenever an incumbent global is required.
 *
 * SpiderMonkey doesn't itself have a notion of incumbent globals as defined
 * by the html spec, so we need the embedding to provide this.
 * See dom/base/ScriptSettings.h for details.
 */
extern JS_PUBLIC_API(void)
SetGetIncumbentGlobalCallback(JSContext* cx, JSGetIncumbentGlobalCallback callback);

/**
 * Sets the callback that's invoked whenever a Promise job should be enqeued.
 *
 * SpiderMonkey doesn't schedule Promise resolution jobs itself; instead,
 * using this function the embedding can provide a callback to do that
 * scheduling. The provided `callback` is invoked with the promise job,
 * the corresponding Promise's allocation stack, and the `data` pointer
 * passed here as arguments.
 */
extern JS_PUBLIC_API(void)
SetEnqueuePromiseJobCallback(JSContext* cx, JSEnqueuePromiseJobCallback callback,
                             void* data = nullptr);

/**
 * Sets the callback that's invoked whenever a Promise is rejected without
 * a rejection handler, and when a Promise that was previously rejected
 * without a handler gets a handler attached.
 */
extern JS_PUBLIC_API(void)
SetPromiseRejectionTrackerCallback(JSContext* cx, JSPromiseRejectionTrackerCallback callback,
                                   void* data = nullptr);

/**
 * Returns a new instance of the Promise builtin class in the current
 * compartment, with the right slot layout. If a `proto` is passed, that gets
 * set as the instance's [[Prototype]] instead of the original value of
 * `Promise.prototype`.
 */
extern JS_PUBLIC_API(JSObject*)
NewPromiseObject(JSContext* cx, JS::HandleObject executor, JS::HandleObject proto = nullptr);

/**
 * Returns true if the given object is an unwrapped PromiseObject, false
 * otherwise.
 */
extern JS_PUBLIC_API(bool)
IsPromiseObject(JS::HandleObject obj);

/**
 * Returns the current compartment's original Promise constructor.
 */
extern JS_PUBLIC_API(JSObject*)
GetPromiseConstructor(JSContext* cx);

/**
 * Returns the current compartment's original Promise.prototype.
 */
extern JS_PUBLIC_API(JSObject*)
GetPromisePrototype(JSContext* cx);

// Keep this in sync with the PROMISE_STATE defines in SelfHostingDefines.h.
enum class PromiseState {
    Pending,
    Fulfilled,
    Rejected
};

/**
 * Returns the given Promise's state as a JS::PromiseState enum value.
 *
 * Returns JS::PromiseState::Pending if the given object is a wrapper that
 * can't safely be unwrapped.
 */
extern JS_PUBLIC_API(PromiseState)
GetPromiseState(JS::HandleObject promise);

/**
 * Returns the given Promise's process-unique ID.
 */
JS_PUBLIC_API(uint64_t)
GetPromiseID(JS::HandleObject promise);

/**
 * Returns the given Promise's result: either the resolution value for
 * fulfilled promises, or the rejection reason for rejected ones.
 */
extern JS_PUBLIC_API(JS::Value)
GetPromiseResult(JS::HandleObject promise);

/**
 * Returns a js::SavedFrame linked list of the stack that lead to the given
 * Promise's allocation.
 */
extern JS_PUBLIC_API(JSObject*)
GetPromiseAllocationSite(JS::HandleObject promise);

extern JS_PUBLIC_API(JSObject*)
GetPromiseResolutionSite(JS::HandleObject promise);

#ifdef DEBUG
extern JS_PUBLIC_API(void)
DumpPromiseAllocationSite(JSContext* cx, JS::HandleObject promise);

extern JS_PUBLIC_API(void)
DumpPromiseResolutionSite(JSContext* cx, JS::HandleObject promise);
#endif

/**
 * Calls the current compartment's original Promise.resolve on the original
 * Promise constructor, with `resolutionValue` passed as an argument.
 */
extern JS_PUBLIC_API(JSObject*)
CallOriginalPromiseResolve(JSContext* cx, JS::HandleValue resolutionValue);

/**
 * Calls the current compartment's original Promise.reject on the original
 * Promise constructor, with `resolutionValue` passed as an argument.
 */
extern JS_PUBLIC_API(JSObject*)
CallOriginalPromiseReject(JSContext* cx, JS::HandleValue rejectionValue);

/**
 * Resolves the given Promise with the given `resolutionValue`.
 *
 * Calls the `resolve` function that was passed to the executor function when
 * the Promise was created.
 */
extern JS_PUBLIC_API(bool)
ResolvePromise(JSContext* cx, JS::HandleObject promise, JS::HandleValue resolutionValue);

/**
 * Rejects the given `promise` with the given `rejectionValue`.
 *
 * Calls the `reject` function that was passed to the executor function when
 * the Promise was created.
 */
extern JS_PUBLIC_API(bool)
RejectPromise(JSContext* cx, JS::HandleObject promise, JS::HandleValue rejectionValue);

/**
 * Calls the current compartment's original Promise.prototype.then on the
 * given `promise`, with `onResolve` and `onReject` passed as arguments.
 *
 * Asserts if the passed-in `promise` object isn't an unwrapped instance of
 * `Promise` or a subclass or `onResolve` and `onReject` aren't both either
 * `nullptr` or callable objects.
 */
extern JS_PUBLIC_API(JSObject*)
CallOriginalPromiseThen(JSContext* cx, JS::HandleObject promise,
                        JS::HandleObject onResolve, JS::HandleObject onReject);

/**
 * Unforgeable, optimized version of the JS builtin Promise.prototype.then.
 *
 * Takes a Promise instance and `onResolve`, `onReject` callables to enqueue
 * as reactions for that promise. In difference to Promise.prototype.then,
 * this doesn't create and return a new Promise instance.
 *
 * Asserts if the passed-in `promise` object isn't an unwrapped instance of
 * `Promise` or a subclass or `onResolve` and `onReject` aren't both callable
 * objects.
 */
extern JS_PUBLIC_API(bool)
AddPromiseReactions(JSContext* cx, JS::HandleObject promise,
                    JS::HandleObject onResolve, JS::HandleObject onReject);

/**
 * Unforgeable version of the JS builtin Promise.all.
 *
 * Takes an AutoObjectVector of Promise objects and returns a promise that's
 * resolved with an array of resolution values when all those promises have
 * been resolved, or rejected with the rejection value of the first rejected
 * promise.
 *
 * Asserts that all objects in the `promises` vector are, maybe wrapped,
 * instances of `Promise` or a subclass of `Promise`.
 */
extern JS_PUBLIC_API(JSObject*)
GetWaitForAllPromise(JSContext* cx, const JS::AutoObjectVector& promises);

/**
 * An AsyncTask represents a SpiderMonkey-internal operation that starts on a
 * JSContext's owner thread, possibly executes on other threads, completes, and
 * then needs to be scheduled to run again on the JSContext's owner thread. The
 * embedding provides for this final dispatch back to the JSContext's owner
 * thread by calling methods on this interface when requested.
 */
struct JS_PUBLIC_API(AsyncTask)
{
    AsyncTask() : user(nullptr) {}
    virtual ~AsyncTask() {}

    /**
     * After the FinishAsyncTaskCallback is called and succeeds, one of these
     * two functions will be called on the original JSContext's owner thread.
     */
    virtual void finish(JSContext* cx) = 0;
    virtual void cancel(JSContext* cx) = 0;

    /* The embedding may use this field to attach arbitrary data to a task. */
    void* user;
};

/**
 * A new AsyncTask object, created inside SpiderMonkey on the JSContext's owner
 * thread, will be passed to the StartAsyncTaskCallback before it is dispatched
 * to another thread. The embedding may use the AsyncTask::user field to attach
 * additional task state.
 *
 * If this function succeeds, SpiderMonkey will call the FinishAsyncTaskCallback
 * at some point in the future. Otherwise, FinishAsyncTaskCallback will *not*
 * be called. SpiderMonkey assumes that, if StartAsyncTaskCallback fails, it is
 * because the JSContext is being shut down.
 */
typedef bool
(*StartAsyncTaskCallback)(JSContext* cx, AsyncTask* task);

/**
 * The FinishAsyncTaskCallback may be called from any thread and will only be
 * passed AsyncTasks that have already been started via StartAsyncTaskCallback.
 * If the embedding returns 'true', indicating success, the embedding must call
 * either task->finish() or task->cancel() on the JSContext's owner thread at
 * some point in the future.
 */
typedef bool
(*FinishAsyncTaskCallback)(AsyncTask* task);

/**
 * Set the above callbacks for the given context.
 */
extern JS_PUBLIC_API(void)
SetAsyncTaskCallbacks(JSContext* cx, StartAsyncTaskCallback start, FinishAsyncTaskCallback finish);

} // namespace JS

extern JS_PUBLIC_API(bool)
JS_IsRunning(JSContext* cx);

namespace JS {

/**
 * This class can be used to store a pointer to the youngest frame of a saved
 * stack in the specified JSContext. This reference will be picked up by any new
 * calls performed until the class is destroyed, with the specified asyncCause,
 * that must not be empty.
 *
 * Any stack capture initiated during these new calls will go through the async
 * stack instead of the current stack.
 *
 * Capturing the stack before a new call is performed will not be affected.
 *
 * The provided chain of SavedFrame objects can live in any compartment,
 * although it will be copied to the compartment where the stack is captured.
 *
 * See also `js/src/doc/SavedFrame/SavedFrame.md` for documentation on async
 * stack frames.
 */
class MOZ_STACK_CLASS JS_PUBLIC_API(AutoSetAsyncStackForNewCalls)
{
    JSContext* cx;
    RootedObject oldAsyncStack;
    const char* oldAsyncCause;
    bool oldAsyncCallIsExplicit;

  public:
    enum class AsyncCallKind {
        // The ordinary kind of call, where we may apply an async
        // parent if there is no ordinary parent.
        IMPLICIT,
        // An explicit async parent, e.g., callFunctionWithAsyncStack,
        // where we always want to override any ordinary parent.
        EXPLICIT
    };

    // The stack parameter cannot be null by design, because it would be
    // ambiguous whether that would clear any scheduled async stack and make the
    // normal stack reappear in the new call, or just keep the async stack
    // already scheduled for the new call, if any.
    //
    // asyncCause is owned by the caller and its lifetime must outlive the
    // lifetime of the AutoSetAsyncStackForNewCalls object. It is strongly
    // encouraged that asyncCause be a string constant or similar statically
    // allocated string.
    AutoSetAsyncStackForNewCalls(JSContext* cx, HandleObject stack,
                                 const char* asyncCause,
                                 AsyncCallKind kind = AsyncCallKind::IMPLICIT);
    ~AutoSetAsyncStackForNewCalls();
};

} // namespace JS

/************************************************************************/

/*
 * Strings.
 *
 * NB: JS_NewUCString takes ownership of bytes on success, avoiding a copy;
 * but on error (signified by null return), it leaves chars owned by the
 * caller. So the caller must free bytes in the error case, if it has no use
 * for them. In contrast, all the JS_New*StringCopy* functions do not take
 * ownership of the character memory passed to them -- they copy it.
 */
extern JS_PUBLIC_API(JSString*)
JS_NewStringCopyN(JSContext* cx, const char* s, size_t n);

extern JS_PUBLIC_API(JSString*)
JS_NewStringCopyZ(JSContext* cx, const char* s);

extern JS_PUBLIC_API(JSString*)
JS_NewStringCopyUTF8Z(JSContext* cx, const JS::ConstUTF8CharsZ s);

extern JS_PUBLIC_API(JSString*)
JS_NewStringCopyUTF8N(JSContext* cx, const JS::UTF8Chars s);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeAndPinJSString(JSContext* cx, JS::HandleString str);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeStringN(JSContext* cx, const char* s, size_t length);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeString(JSContext* cx, const char* s);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeAndPinStringN(JSContext* cx, const char* s, size_t length);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeAndPinString(JSContext* cx, const char* s);

extern JS_PUBLIC_API(JSString*)
JS_NewUCString(JSContext* cx, char16_t* chars, size_t length);

extern JS_PUBLIC_API(JSString*)
JS_NewUCStringCopyN(JSContext* cx, const char16_t* s, size_t n);

extern JS_PUBLIC_API(JSString*)
JS_NewUCStringCopyZ(JSContext* cx, const char16_t* s);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeUCStringN(JSContext* cx, const char16_t* s, size_t length);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeUCString(JSContext* cx, const char16_t* s);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeAndPinUCStringN(JSContext* cx, const char16_t* s, size_t length);

extern JS_PUBLIC_API(JSString*)
JS_AtomizeAndPinUCString(JSContext* cx, const char16_t* s);

extern JS_PUBLIC_API(bool)
JS_CompareStrings(JSContext* cx, JSString* str1, JSString* str2, int32_t* result);

extern JS_PUBLIC_API(bool)
JS_StringEqualsAscii(JSContext* cx, JSString* str, const char* asciiBytes, bool* match);

extern JS_PUBLIC_API(size_t)
JS_PutEscapedString(JSContext* cx, char* buffer, size_t size, JSString* str, char quote);

extern JS_PUBLIC_API(bool)
JS_FileEscapedString(FILE* fp, JSString* str, char quote);

/*
 * Extracting string characters and length.
 *
 * While getting the length of a string is infallible, getting the chars can
 * fail. As indicated by the lack of a JSContext parameter, there are two
 * special cases where getting the chars is infallible:
 *
 * The first case is for strings that have been atomized, e.g. directly by
 * JS_AtomizeAndPinString or implicitly because it is stored in a jsid.
 *
 * The second case is "flat" strings that have been explicitly prepared in a
 * fallible context by JS_FlattenString. To catch errors, a separate opaque
 * JSFlatString type is returned by JS_FlattenString and expected by
 * JS_GetFlatStringChars. Note, though, that this is purely a syntactic
 * distinction: the input and output of JS_FlattenString are the same actual
 * GC-thing. If a JSString is known to be flat, JS_ASSERT_STRING_IS_FLAT can be
 * used to make a debug-checked cast. Example:
 *
 *   // in a fallible context
 *   JSFlatString* fstr = JS_FlattenString(cx, str);
 *   if (!fstr)
 *     return false;
 *   MOZ_ASSERT(fstr == JS_ASSERT_STRING_IS_FLAT(str));
 *
 *   // in an infallible context, for the same 'str'
 *   AutoCheckCannotGC nogc;
 *   const char16_t* chars = JS_GetTwoByteFlatStringChars(nogc, fstr)
 *   MOZ_ASSERT(chars);
 *
 * Flat strings and interned strings are always null-terminated, so
 * JS_FlattenString can be used to get a null-terminated string.
 *
 * Additionally, string characters are stored as either Latin1Char (8-bit)
 * or char16_t (16-bit). Clients can use JS_StringHasLatin1Chars and can then
 * call either the Latin1* or TwoByte* functions. Some functions like
 * JS_CopyStringChars and JS_GetStringCharAt accept both Latin1 and TwoByte
 * strings.
 */

extern JS_PUBLIC_API(size_t)
JS_GetStringLength(JSString* str);

extern JS_PUBLIC_API(bool)
JS_StringIsFlat(JSString* str);

/** Returns true iff the string's characters are stored as Latin1. */
extern JS_PUBLIC_API(bool)
JS_StringHasLatin1Chars(JSString* str);

extern JS_PUBLIC_API(const JS::Latin1Char*)
JS_GetLatin1StringCharsAndLength(JSContext* cx, const JS::AutoCheckCannotGC& nogc, JSString* str,
                                 size_t* length);

extern JS_PUBLIC_API(const char16_t*)
JS_GetTwoByteStringCharsAndLength(JSContext* cx, const JS::AutoCheckCannotGC& nogc, JSString* str,
                                  size_t* length);

extern JS_PUBLIC_API(bool)
JS_GetStringCharAt(JSContext* cx, JSString* str, size_t index, char16_t* res);

extern JS_PUBLIC_API(char16_t)
JS_GetFlatStringCharAt(JSFlatString* str, size_t index);

extern JS_PUBLIC_API(const char16_t*)
JS_GetTwoByteExternalStringChars(JSString* str);

extern JS_PUBLIC_API(bool)
JS_CopyStringChars(JSContext* cx, mozilla::Range<char16_t> dest, JSString* str);

extern JS_PUBLIC_API(JSFlatString*)
JS_FlattenString(JSContext* cx, JSString* str);

extern JS_PUBLIC_API(const JS::Latin1Char*)
JS_GetLatin1FlatStringChars(const JS::AutoCheckCannotGC& nogc, JSFlatString* str);

extern JS_PUBLIC_API(const char16_t*)
JS_GetTwoByteFlatStringChars(const JS::AutoCheckCannotGC& nogc, JSFlatString* str);

static MOZ_ALWAYS_INLINE JSFlatString*
JSID_TO_FLAT_STRING(jsid id)
{
    MOZ_ASSERT(JSID_IS_STRING(id));
    return (JSFlatString*)(JSID_BITS(id));
}

static MOZ_ALWAYS_INLINE JSFlatString*
JS_ASSERT_STRING_IS_FLAT(JSString* str)
{
    MOZ_ASSERT(JS_StringIsFlat(str));
    return (JSFlatString*)str;
}

static MOZ_ALWAYS_INLINE JSString*
JS_FORGET_STRING_FLATNESS(JSFlatString* fstr)
{
    return (JSString*)fstr;
}

/*
 * Additional APIs that avoid fallibility when given a flat string.
 */

extern JS_PUBLIC_API(bool)
JS_FlatStringEqualsAscii(JSFlatString* str, const char* asciiBytes);

extern JS_PUBLIC_API(size_t)
JS_PutEscapedFlatString(char* buffer, size_t size, JSFlatString* str, char quote);

/**
 * Create a dependent string, i.e., a string that owns no character storage,
 * but that refers to a slice of another string's chars.  Dependent strings
 * are mutable by definition, so the thread safety comments above apply.
 */
extern JS_PUBLIC_API(JSString*)
JS_NewDependentString(JSContext* cx, JS::HandleString str, size_t start,
                      size_t length);

/**
 * Concatenate two strings, possibly resulting in a rope.
 * See above for thread safety comments.
 */
extern JS_PUBLIC_API(JSString*)
JS_ConcatStrings(JSContext* cx, JS::HandleString left, JS::HandleString right);

/**
 * For JS_DecodeBytes, set *dstlenp to the size of the destination buffer before
 * the call; on return, *dstlenp contains the number of characters actually
 * stored. To determine the necessary destination buffer size, make a sizing
 * call that passes nullptr for dst.
 *
 * On errors, the functions report the error. In that case, *dstlenp contains
 * the number of characters or bytes transferred so far.  If cx is nullptr, no
 * error is reported on failure, and the functions simply return false.
 *
 * NB: This function does not store an additional zero byte or char16_t after the
 * transcoded string.
 */
JS_PUBLIC_API(bool)
JS_DecodeBytes(JSContext* cx, const char* src, size_t srclen, char16_t* dst,
               size_t* dstlenp);

/**
 * A variation on JS_EncodeCharacters where a null terminated string is
 * returned that you are expected to call JS_free on when done.
 */
JS_PUBLIC_API(char*)
JS_EncodeString(JSContext* cx, JSString* str);

/**
 * Same behavior as JS_EncodeString(), but encode into UTF-8 string
 */
JS_PUBLIC_API(char*)
JS_EncodeStringToUTF8(JSContext* cx, JS::HandleString str);

/**
 * Get number of bytes in the string encoding (without accounting for a
 * terminating zero bytes. The function returns (size_t) -1 if the string
 * can not be encoded into bytes and reports an error using cx accordingly.
 */
JS_PUBLIC_API(size_t)
JS_GetStringEncodingLength(JSContext* cx, JSString* str);

/**
 * Encode string into a buffer. The function does not stores an additional
 * zero byte. The function returns (size_t) -1 if the string can not be
 * encoded into bytes with no error reported. Otherwise it returns the number
 * of bytes that are necessary to encode the string. If that exceeds the
 * length parameter, the string will be cut and only length bytes will be
 * written into the buffer.
 */
JS_PUBLIC_API(size_t)
JS_EncodeStringToBuffer(JSContext* cx, JSString* str, char* buffer, size_t length);

class MOZ_RAII JSAutoByteString
{
  public:
    JSAutoByteString(JSContext* cx, JSString* str
                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : mBytes(JS_EncodeString(cx, str))
    {
        MOZ_ASSERT(cx);
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    explicit JSAutoByteString(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM)
      : mBytes(nullptr)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    ~JSAutoByteString() {
        JS_free(nullptr, mBytes);
    }

    /* Take ownership of the given byte array. */
    void initBytes(char* bytes) {
        MOZ_ASSERT(!mBytes);
        mBytes = bytes;
    }

    char* encodeLatin1(JSContext* cx, JSString* str) {
        MOZ_ASSERT(!mBytes);
        MOZ_ASSERT(cx);
        mBytes = JS_EncodeString(cx, str);
        return mBytes;
    }

    char* encodeLatin1(js::ExclusiveContext* cx, JSString* str);

    char* encodeUtf8(JSContext* cx, JS::HandleString str) {
        MOZ_ASSERT(!mBytes);
        MOZ_ASSERT(cx);
        mBytes = JS_EncodeStringToUTF8(cx, str);
        return mBytes;
    }

    void clear() {
        js_free(mBytes);
        mBytes = nullptr;
    }

    char* ptr() const {
        return mBytes;
    }

    bool operator!() const {
        return !mBytes;
    }

    size_t length() const {
        if (!mBytes)
            return 0;
        return strlen(mBytes);
    }

  private:
    char* mBytes;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER

    /* Copy and assignment are not supported. */
    JSAutoByteString(const JSAutoByteString& another);
    JSAutoByteString& operator=(const JSAutoByteString& another);
};

namespace JS {

extern JS_PUBLIC_API(JSAddonId*)
NewAddonId(JSContext* cx, JS::HandleString str);

extern JS_PUBLIC_API(JSString*)
StringOfAddonId(JSAddonId* id);

extern JS_PUBLIC_API(JSAddonId*)
AddonIdOfObject(JSObject* obj);

} // namespace JS

/************************************************************************/
/*
 * Symbols
 */

namespace JS {

/**
 * Create a new Symbol with the given description. This function never returns
 * a Symbol that is in the Runtime-wide symbol registry.
 *
 * If description is null, the new Symbol's [[Description]] attribute is
 * undefined.
 */
JS_PUBLIC_API(Symbol*)
NewSymbol(JSContext* cx, HandleString description);

/**
 * Symbol.for as specified in ES6.
 *
 * Get a Symbol with the description 'key' from the Runtime-wide symbol registry.
 * If there is not already a Symbol with that description in the registry, a new
 * Symbol is created and registered. 'key' must not be null.
 */
JS_PUBLIC_API(Symbol*)
GetSymbolFor(JSContext* cx, HandleString key);

/**
 * Get the [[Description]] attribute of the given symbol.
 *
 * This function is infallible. If it returns null, that means the symbol's
 * [[Description]] is undefined.
 */
JS_PUBLIC_API(JSString*)
GetSymbolDescription(HandleSymbol symbol);

/* Well-known symbols. */
#define JS_FOR_EACH_WELL_KNOWN_SYMBOL(macro) \
    macro(isConcatSpreadable) \
    macro(iterator) \
    macro(match) \
    macro(replace) \
    macro(search) \
    macro(species) \
    macro(hasInstance) \
    macro(split) \
    macro(toPrimitive) \
    macro(toStringTag) \
    macro(unscopables) \
    macro(asyncIterator) \
    macro(matchAll)

enum class SymbolCode : uint32_t {
    // There is one SymbolCode for each well-known symbol.
#define JS_DEFINE_SYMBOL_ENUM(name) name,
    JS_FOR_EACH_WELL_KNOWN_SYMBOL(JS_DEFINE_SYMBOL_ENUM)  // SymbolCode::iterator, etc.
#undef JS_DEFINE_SYMBOL_ENUM
    Limit,
    InSymbolRegistry = 0xfffffffe,  // created by Symbol.for() or JS::GetSymbolFor()
    UniqueSymbol = 0xffffffff       // created by Symbol() or JS::NewSymbol()
};

/* For use in loops that iterate over the well-known symbols. */
const size_t WellKnownSymbolLimit = size_t(SymbolCode::Limit);

/**
 * Return the SymbolCode telling what sort of symbol `symbol` is.
 *
 * A symbol's SymbolCode never changes once it is created.
 */
JS_PUBLIC_API(SymbolCode)
GetSymbolCode(Handle<Symbol*> symbol);

/**
 * Get one of the well-known symbols defined by ES6. A single set of well-known
 * symbols is shared by all compartments in a JSRuntime.
 *
 * `which` must be in the range [0, WellKnownSymbolLimit).
 */
JS_PUBLIC_API(Symbol*)
GetWellKnownSymbol(JSContext* cx, SymbolCode which);

/**
 * Return true if the given JSPropertySpec::name or JSFunctionSpec::name value
 * is actually a symbol code and not a string. See JS_SYM_FN.
 */
inline bool
PropertySpecNameIsSymbol(const char* name)
{
    uintptr_t u = reinterpret_cast<uintptr_t>(name);
    return u != 0 && u - 1 < WellKnownSymbolLimit;
}

JS_PUBLIC_API(bool)
PropertySpecNameEqualsId(const char* name, HandleId id);

/**
 * Create a jsid that does not need to be marked for GC.
 *
 * 'name' is a JSPropertySpec::name or JSFunctionSpec::name value. The
 * resulting jsid, on success, is either an interned string or a well-known
 * symbol; either way it is immune to GC so there is no need to visit *idp
 * during GC marking.
 */
JS_PUBLIC_API(bool)
PropertySpecNameToPermanentId(JSContext* cx, const char* name, jsid* idp);

} /* namespace JS */

/************************************************************************/
/*
 * JSON functions
 */
typedef bool (* JSONWriteCallback)(const char16_t* buf, uint32_t len, void* data);

/**
 * JSON.stringify as specified by ES5.
 */
JS_PUBLIC_API(bool)
JS_Stringify(JSContext* cx, JS::MutableHandleValue value, JS::HandleObject replacer,
             JS::HandleValue space, JSONWriteCallback callback, void* data);

namespace JS {

/**
 * An API akin to JS_Stringify but with the goal of not having observable
 * side-effects when the stringification is performed.  This means it does not
 * allow a replacer or a custom space, and has the following constraints on its
 * input:
 *
 * 1) The input must be a plain object or array, not an abitrary value.
 * 2) Every value in the graph reached by the algorithm starting with this
 *    object must be one of the following: null, undefined, a string (NOT a
 *    string object!), a boolean, a finite number (i.e. no NaN or Infinity or
 *    -Infinity), a plain object with no accessor properties, or an Array with
 *    no holes.
 *
 * The actual behavior differs from JS_Stringify only in asserting the above and
 * NOT attempting to get the "toJSON" property from things, since that could
 * clearly have side-effects.
 */
JS_PUBLIC_API(bool)
ToJSONMaybeSafely(JSContext* cx, JS::HandleObject input,
                  JSONWriteCallback callback, void* data);

} /* namespace JS */

/**
 * JSON.parse as specified by ES5.
 */
JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext* cx, const char16_t* chars, uint32_t len, JS::MutableHandleValue vp);

JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext* cx, JS::HandleString str, JS::MutableHandleValue vp);

JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext* cx, const char16_t* chars, uint32_t len, JS::HandleValue reviver,
                        JS::MutableHandleValue vp);

JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext* cx, JS::HandleString str, JS::HandleValue reviver,
                        JS::MutableHandleValue vp);

/************************************************************************/

/**
 * The default locale for the ECMAScript Internationalization API
 * (Intl.Collator, Intl.NumberFormat, Intl.DateTimeFormat).
 * Note that the Internationalization API encourages clients to
 * specify their own locales.
 * The locale string remains owned by the caller.
 */
extern JS_PUBLIC_API(bool)
JS_SetDefaultLocale(JSContext* cx, const char* locale);

/**
 * Look up the default locale for the ECMAScript Internationalization API.
 */
extern JS_PUBLIC_API(JS::UniqueChars)
JS_GetDefaultLocale(JSContext* cx);

/**
 * Reset the default locale to OS defaults.
 */
extern JS_PUBLIC_API(void)
JS_ResetDefaultLocale(JSContext* cx);

/**
 * Locale specific string conversion and error message callbacks.
 */
struct JSLocaleCallbacks {
    JSLocaleToUpperCase     localeToUpperCase;
    JSLocaleToLowerCase     localeToLowerCase;
    JSLocaleCompare         localeCompare; // not used
    JSLocaleToUnicode       localeToUnicode;
};

/**
 * Establish locale callbacks. The pointer must persist as long as the
 * JSContext.  Passing nullptr restores the default behaviour.
 */
extern JS_PUBLIC_API(void)
JS_SetLocaleCallbacks(JSContext* cx, const JSLocaleCallbacks* callbacks);

/**
 * Return the address of the current locale callbacks struct, which may
 * be nullptr.
 */
extern JS_PUBLIC_API(const JSLocaleCallbacks*)
JS_GetLocaleCallbacks(JSContext* cx);

/************************************************************************/

/*
 * Error reporting.
 */

namespace JS {
const uint16_t MaxNumErrorArguments = 10;
};

/**
 * Report an exception represented by the sprintf-like conversion of format
 * and its arguments.
 */
extern JS_PUBLIC_API(void)
JS_ReportErrorASCII(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

extern JS_PUBLIC_API(void)
JS_ReportErrorLatin1(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

extern JS_PUBLIC_API(void)
JS_ReportErrorUTF8(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

/*
 * Use an errorNumber to retrieve the format string, args are char*
 */
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberASCII(JSContext* cx, JSErrorCallback errorCallback,
                          void* userRef, const unsigned errorNumber, ...);

extern JS_PUBLIC_API(void)
JS_ReportErrorNumberASCIIVA(JSContext* cx, JSErrorCallback errorCallback,
                            void* userRef, const unsigned errorNumber, va_list ap);

extern JS_PUBLIC_API(void)
JS_ReportErrorNumberLatin1(JSContext* cx, JSErrorCallback errorCallback,
                           void* userRef, const unsigned errorNumber, ...);

#ifdef va_start
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberLatin1VA(JSContext* cx, JSErrorCallback errorCallback,
                             void* userRef, const unsigned errorNumber, va_list ap);
#endif

extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUTF8(JSContext* cx, JSErrorCallback errorCallback,
                           void* userRef, const unsigned errorNumber, ...);

#ifdef va_start
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUTF8VA(JSContext* cx, JSErrorCallback errorCallback,
                           void* userRef, const unsigned errorNumber, va_list ap);
#endif

/*
 * Use an errorNumber to retrieve the format string, args are char16_t*
 */
extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUC(JSContext* cx, JSErrorCallback errorCallback,
                     void* userRef, const unsigned errorNumber, ...);

extern JS_PUBLIC_API(void)
JS_ReportErrorNumberUCArray(JSContext* cx, JSErrorCallback errorCallback,
                            void* userRef, const unsigned errorNumber,
                            const char16_t** args);

/**
 * As above, but report a warning instead (JSREPORT_IS_WARNING(report.flags)).
 * Return true if there was no error trying to issue the warning, and if the
 * warning was not converted into an error due to the JSOPTION_WERROR option
 * being set, false otherwise.
 */
extern JS_PUBLIC_API(bool)
JS_ReportWarningASCII(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

extern JS_PUBLIC_API(bool)
JS_ReportWarningLatin1(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

extern JS_PUBLIC_API(bool)
JS_ReportWarningUTF8(JSContext* cx, const char* format, ...)
    MOZ_FORMAT_PRINTF(2, 3);

extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumberASCII(JSContext* cx, unsigned flags,
                                  JSErrorCallback errorCallback, void* userRef,
                                  const unsigned errorNumber, ...);

extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumberLatin1(JSContext* cx, unsigned flags,
                                   JSErrorCallback errorCallback, void* userRef,
                                   const unsigned errorNumber, ...);

extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumberUTF8(JSContext* cx, unsigned flags,
                                 JSErrorCallback errorCallback, void* userRef,
                                 const unsigned errorNumber, ...);

extern JS_PUBLIC_API(bool)
JS_ReportErrorFlagsAndNumberUC(JSContext* cx, unsigned flags,
                               JSErrorCallback errorCallback, void* userRef,
                               const unsigned errorNumber, ...);

/**
 * Complain when out of memory.
 */
extern JS_PUBLIC_API(void)
JS_ReportOutOfMemory(JSContext* cx);

/**
 * Complain when an allocation size overflows the maximum supported limit.
 */
extern JS_PUBLIC_API(void)
JS_ReportAllocationOverflow(JSContext* cx);

/**
 * Base class that implements parts shared by JSErrorReport and
 * JSErrorNotes::Note.
 */
class JSErrorBase
{
    // The (default) error message.
    // If ownsMessage_ is true, the it is freed in destructor.
    JS::ConstUTF8CharsZ message_;

  public:
    JSErrorBase()
      : filename(nullptr), lineno(0), column(0),
        errorNumber(0),
        ownsMessage_(false)
    {}

    ~JSErrorBase() {
        freeMessage();
    }

    // Source file name, URL, etc., or null.
    const char* filename;

    // Source line number.
    unsigned lineno;

    // Zero-based column index in line.
    unsigned column;

    // the error number, e.g. see js.msg.
    unsigned errorNumber;

  private:
    bool ownsMessage_ : 1;

  public:
    const JS::ConstUTF8CharsZ message() const {
        return message_;
    }

    void initOwnedMessage(const char* messageArg) {
        initBorrowedMessage(messageArg);
        ownsMessage_ = true;
    }
    void initBorrowedMessage(const char* messageArg) {
        MOZ_ASSERT(!message_);
        message_ = JS::ConstUTF8CharsZ(messageArg, strlen(messageArg));
    }

    JSString* newMessageString(JSContext* cx);

  private:
    void freeMessage();
};

/**
 * Notes associated with JSErrorReport.
 */
class JSErrorNotes
{
  public:
    class Note : public JSErrorBase
    {};

  private:
    // Stores pointers to each note.
    js::Vector<js::UniquePtr<Note>, 1, js::SystemAllocPolicy> notes_;

  public:
    JSErrorNotes();
    ~JSErrorNotes();

    // Add an note to the given position.
    bool addNoteASCII(js::ExclusiveContext* cx,
                      const char* filename, unsigned lineno, unsigned column,
                      JSErrorCallback errorCallback, void* userRef,
                      const unsigned errorNumber, ...);
    bool addNoteLatin1(js::ExclusiveContext* cx,
                       const char* filename, unsigned lineno, unsigned column,
                       JSErrorCallback errorCallback, void* userRef,
                       const unsigned errorNumber, ...);
    bool addNoteUTF8(js::ExclusiveContext* cx,
                     const char* filename, unsigned lineno, unsigned column,
                     JSErrorCallback errorCallback, void* userRef,
                     const unsigned errorNumber, ...);

    size_t length();

    // Create a deep copy of notes.
    js::UniquePtr<JSErrorNotes> copy(JSContext* cx);

    class iterator : public std::iterator<std::input_iterator_tag, js::UniquePtr<Note>>
    {
        js::UniquePtr<Note>* note_;
      public:
        explicit iterator(js::UniquePtr<Note>* note = nullptr) : note_(note)
        {}

        bool operator==(iterator other) const {
            return note_ == other.note_;
        }
        bool operator!=(iterator other) const {
            return !(*this == other);
        }
        iterator& operator++() {
            note_++;
            return *this;
        }
        reference operator*() {
            return *note_;
        }
    };
    iterator begin();
    iterator end();
};

/**
 * Describes a single error or warning that occurs in the execution of script.
 */
class JSErrorReport : public JSErrorBase
{
    // Offending source line without final '\n'.
    // If ownsLinebuf_ is true, the buffer is freed in destructor.
    const char16_t* linebuf_;

    // Number of chars in linebuf_. Does not include trailing '\0'.
    size_t linebufLength_;

    // The 0-based offset of error token in linebuf_.
    size_t tokenOffset_;

  public:
    JSErrorReport()
      : linebuf_(nullptr), linebufLength_(0), tokenOffset_(0),
        notes(nullptr),
        flags(0), exnType(0), isMuted(false),
        ownsLinebuf_(false)
    {}

    ~JSErrorReport() {
        freeLinebuf();
    }

    // Associated notes, or nullptr if there's no note.
    js::UniquePtr<JSErrorNotes> notes;

    // error/warning, etc.
    unsigned flags;

    // One of the JSExnType constants.
    int16_t exnType;

    // See the comment in ReadOnlyCompileOptions.
    bool isMuted : 1;

  private:
    bool ownsLinebuf_ : 1;

  public:
    const char16_t* linebuf() const {
        return linebuf_;
    }
    size_t linebufLength() const {
        return linebufLength_;
    }
    size_t tokenOffset() const {
        return tokenOffset_;
    }
    void initOwnedLinebuf(const char16_t* linebufArg, size_t linebufLengthArg,
                          size_t tokenOffsetArg) {
        initBorrowedLinebuf(linebufArg, linebufLengthArg, tokenOffsetArg);
        ownsLinebuf_ = true;
    }
    void initBorrowedLinebuf(const char16_t* linebufArg, size_t linebufLengthArg,
                             size_t tokenOffsetArg);

  private:
    void freeLinebuf();
};

/*
 * JSErrorReport flag values.  These may be freely composed.
 */
#define JSREPORT_ERROR      0x0     /* pseudo-flag for default case */
#define JSREPORT_WARNING    0x1     /* reported via JS_ReportWarning */
#define JSREPORT_EXCEPTION  0x2     /* exception was thrown */
#define JSREPORT_STRICT     0x4     /* error or warning due to strict option */

#define JSREPORT_USER_1     0x8     /* user-defined flag */

/*
 * If JSREPORT_EXCEPTION is set, then a JavaScript-catchable exception
 * has been thrown for this runtime error, and the host should ignore it.
 * Exception-aware hosts should also check for JS_IsExceptionPending if
 * JS_ExecuteScript returns failure, and signal or propagate the exception, as
 * appropriate.
 */
#define JSREPORT_IS_WARNING(flags)      (((flags) & JSREPORT_WARNING) != 0)
#define JSREPORT_IS_EXCEPTION(flags)    (((flags) & JSREPORT_EXCEPTION) != 0)
#define JSREPORT_IS_STRICT(flags)       (((flags) & JSREPORT_STRICT) != 0)

namespace JS {

using WarningReporter = void (*)(JSContext* cx, JSErrorReport* report);

extern JS_PUBLIC_API(WarningReporter)
SetWarningReporter(JSContext* cx, WarningReporter reporter);

extern JS_PUBLIC_API(WarningReporter)
GetWarningReporter(JSContext* cx);

extern JS_PUBLIC_API(bool)
CreateError(JSContext* cx, JSExnType type, HandleObject stack,
            HandleString fileName, uint32_t lineNumber, uint32_t columnNumber,
            JSErrorReport* report, HandleString message, MutableHandleValue rval);

/************************************************************************/

/*
 * Weak Maps.
 */

extern JS_PUBLIC_API(JSObject*)
NewWeakMapObject(JSContext* cx);

extern JS_PUBLIC_API(bool)
IsWeakMapObject(JSObject* obj);

extern JS_PUBLIC_API(bool)
GetWeakMapEntry(JSContext* cx, JS::HandleObject mapObj, JS::HandleObject key,
                JS::MutableHandleValue val);

extern JS_PUBLIC_API(bool)
SetWeakMapEntry(JSContext* cx, JS::HandleObject mapObj, JS::HandleObject key,
                JS::HandleValue val);

/*
 * Map
 */
extern JS_PUBLIC_API(JSObject*)
NewMapObject(JSContext* cx);

extern JS_PUBLIC_API(uint32_t)
MapSize(JSContext* cx, HandleObject obj);

extern JS_PUBLIC_API(bool)
MapGet(JSContext* cx, HandleObject obj,
       HandleValue key, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
MapHas(JSContext* cx, HandleObject obj, HandleValue key, bool* rval);

extern JS_PUBLIC_API(bool)
MapSet(JSContext* cx, HandleObject obj, HandleValue key, HandleValue val);

extern JS_PUBLIC_API(bool)
MapDelete(JSContext *cx, HandleObject obj, HandleValue key, bool *rval);

extern JS_PUBLIC_API(bool)
MapClear(JSContext* cx, HandleObject obj);

extern JS_PUBLIC_API(bool)
MapKeys(JSContext* cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
MapValues(JSContext* cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
MapEntries(JSContext* cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
MapForEach(JSContext *cx, HandleObject obj, HandleValue callbackFn, HandleValue thisVal);

/*
 * Set
 */
extern JS_PUBLIC_API(JSObject *)
NewSetObject(JSContext *cx);

extern JS_PUBLIC_API(uint32_t)
SetSize(JSContext *cx, HandleObject obj);

extern JS_PUBLIC_API(bool)
SetHas(JSContext *cx, HandleObject obj, HandleValue key, bool *rval);

extern JS_PUBLIC_API(bool)
SetDelete(JSContext *cx, HandleObject obj, HandleValue key, bool *rval);

extern JS_PUBLIC_API(bool)
SetAdd(JSContext *cx, HandleObject obj, HandleValue key);

extern JS_PUBLIC_API(bool)
SetClear(JSContext *cx, HandleObject obj);

extern JS_PUBLIC_API(bool)
SetKeys(JSContext *cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
SetValues(JSContext *cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
SetEntries(JSContext *cx, HandleObject obj, MutableHandleValue rval);

extern JS_PUBLIC_API(bool)
SetForEach(JSContext *cx, HandleObject obj, HandleValue callbackFn, HandleValue thisVal);

} /* namespace JS */

/*
 * Dates.
 */

extern JS_PUBLIC_API(JSObject*)
JS_NewDateObject(JSContext* cx, int year, int mon, int mday, int hour, int min, int sec);

/**
 * Returns true and sets |*isDate| indicating whether |obj| is a Date object or
 * a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isDate == false| when passed a proxy whose
 * target is a Date, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
JS_ObjectIsDate(JSContext* cx, JS::HandleObject obj, bool* isDate);

/************************************************************************/

/*
 * Regular Expressions.
 */
#define JSREG_FOLD      0x01u   /* fold uppercase to lowercase */
#define JSREG_GLOB      0x02u   /* global exec, creates array of matches */
#define JSREG_MULTILINE 0x04u   /* treat ^ and $ as begin and end of line */
#define JSREG_STICKY    0x08u   /* only match starting at lastIndex */
#define JSREG_UNICODE   0x10u   /* unicode */
#define JSREG_DOTALL    0x20u   /* match . to everything including newlines */

extern JS_PUBLIC_API(JSObject*)
JS_NewRegExpObject(JSContext* cx, const char* bytes, size_t length, unsigned flags);

extern JS_PUBLIC_API(JSObject*)
JS_NewUCRegExpObject(JSContext* cx, const char16_t* chars, size_t length, unsigned flags);

extern JS_PUBLIC_API(bool)
JS_SetRegExpInput(JSContext* cx, JS::HandleObject obj, JS::HandleString input);

extern JS_PUBLIC_API(bool)
JS_ClearRegExpStatics(JSContext* cx, JS::HandleObject obj);

extern JS_PUBLIC_API(bool)
JS_ExecuteRegExp(JSContext* cx, JS::HandleObject obj, JS::HandleObject reobj,
                 char16_t* chars, size_t length, size_t* indexp, bool test,
                 JS::MutableHandleValue rval);

/* RegExp interface for clients without a global object. */

extern JS_PUBLIC_API(bool)
JS_ExecuteRegExpNoStatics(JSContext* cx, JS::HandleObject reobj, char16_t* chars, size_t length,
                          size_t* indexp, bool test, JS::MutableHandleValue rval);

/**
 * Returns true and sets |*isRegExp| indicating whether |obj| is a RegExp
 * object or a wrapper around one, otherwise returns false on failure.
 *
 * This method returns true with |*isRegExp == false| when passed a proxy whose
 * target is a RegExp, or when passed a revoked proxy.
 */
extern JS_PUBLIC_API(bool)
JS_ObjectIsRegExp(JSContext* cx, JS::HandleObject obj, bool* isRegExp);

extern JS_PUBLIC_API(unsigned)
JS_GetRegExpFlags(JSContext* cx, JS::HandleObject obj);

extern JS_PUBLIC_API(JSString*)
JS_GetRegExpSource(JSContext* cx, JS::HandleObject obj);

/************************************************************************/

extern JS_PUBLIC_API(bool)
JS_IsExceptionPending(JSContext* cx);

extern JS_PUBLIC_API(bool)
JS_GetPendingException(JSContext* cx, JS::MutableHandleValue vp);

extern JS_PUBLIC_API(void)
JS_SetPendingException(JSContext* cx, JS::HandleValue v);

extern JS_PUBLIC_API(void)
JS_ClearPendingException(JSContext* cx);

namespace JS {

/**
 * Save and later restore the current exception state of a given JSContext.
 * This is useful for implementing behavior in C++ that's like try/catch
 * or try/finally in JS.
 *
 * Typical usage:
 *
 *     bool ok = JS::Evaluate(cx, ...);
 *     AutoSaveExceptionState savedExc(cx);
 *     ... cleanup that might re-enter JS ...
 *     return ok;
 */
class JS_PUBLIC_API(AutoSaveExceptionState)
{
  private:
    JSContext* context;
    bool wasPropagatingForcedReturn;
    bool wasOverRecursed;
    bool wasThrowing;
    RootedValue exceptionValue;

  public:
    /*
     * Take a snapshot of cx's current exception state. Then clear any current
     * pending exception in cx.
     */
    explicit AutoSaveExceptionState(JSContext* cx);

    /*
     * If neither drop() nor restore() was called, restore the exception
     * state only if no exception is currently pending on cx.
     */
    ~AutoSaveExceptionState();

    /*
     * Discard any stored exception state.
     * If this is called, the destructor is a no-op.
     */
    void drop() {
        wasPropagatingForcedReturn = false;
        wasOverRecursed = false;
        wasThrowing = false;
        exceptionValue.setUndefined();
    }

    /*
     * Replace cx's exception state with the stored exception state. Then
     * discard the stored exception state. If this is called, the
     * destructor is a no-op.
     */
    void restore();
};

} /* namespace JS */

/* Deprecated API. Use AutoSaveExceptionState instead. */
extern JS_PUBLIC_API(JSExceptionState*)
JS_SaveExceptionState(JSContext* cx);

extern JS_PUBLIC_API(void)
JS_RestoreExceptionState(JSContext* cx, JSExceptionState* state);

extern JS_PUBLIC_API(void)
JS_DropExceptionState(JSContext* cx, JSExceptionState* state);

/**
 * If the given object is an exception object, the exception will have (or be
 * able to lazily create) an error report struct, and this function will return
 * the address of that struct.  Otherwise, it returns nullptr. The lifetime
 * of the error report struct that might be returned is the same as the
 * lifetime of the exception object.
 */
extern JS_PUBLIC_API(JSErrorReport*)
JS_ErrorFromException(JSContext* cx, JS::HandleObject obj);

/**
 * If the given object is an exception object (or an unwrappable
 * cross-compartment wrapper for one), return the stack for that exception, if
 * any.  Will return null if the given object is not an exception object
 * (including if it's null or a security wrapper that can't be unwrapped) or if
 * the exception has no stack.
 */
extern JS_PUBLIC_API(JSObject*)
ExceptionStackOrNull(JS::HandleObject obj);

/*
 * Throws a StopIteration exception on cx.
 */
extern JS_PUBLIC_API(bool)
JS_ThrowStopIteration(JSContext* cx);

extern JS_PUBLIC_API(bool)
JS_IsStopIteration(const JS::Value& v);

/**
 * A JS context always has an "owner thread". The owner thread is set when the
 * context is created (to the current thread) and practically all entry points
 * into the JS engine check that a context (or anything contained in the
 * context: runtime, compartment, object, etc) is only touched by its owner
 * thread. Embeddings may check this invariant outside the JS engine by calling
 * JS_AbortIfWrongThread (which will abort if not on the owner thread, even for
 * non-debug builds).
 */

extern JS_PUBLIC_API(void)
JS_AbortIfWrongThread(JSContext* cx);

/************************************************************************/

/**
 * A constructor can request that the JS engine create a default new 'this'
 * object of the given class, using the callee to determine parentage and
 * [[Prototype]].
 */
extern JS_PUBLIC_API(JSObject*)
JS_NewObjectForConstructor(JSContext* cx, const JSClass* clasp, const JS::CallArgs& args);

/************************************************************************/

extern JS_PUBLIC_API(void)
JS_SetParallelParsingEnabled(JSContext* cx, bool enabled);

extern JS_PUBLIC_API(void)
JS_SetOffthreadIonCompilationEnabled(JSContext* cx, bool enabled);

#define JIT_COMPILER_OPTIONS(Register)                                      \
    Register(BASELINE_WARMUP_TRIGGER, "baseline.warmup.trigger")            \
    Register(ION_WARMUP_TRIGGER, "ion.warmup.trigger")                      \
    Register(ION_GVN_ENABLE, "ion.gvn.enable")                              \
    Register(ION_FORCE_IC, "ion.forceinlineCaches")                         \
    Register(ION_ENABLE, "ion.enable")                                      \
    Register(ION_INTERRUPT_WITHOUT_SIGNAL, "ion.interrupt-without-signals") \
    Register(ION_CHECK_RANGE_ANALYSIS, "ion.check-range-analysis")          \
    Register(BASELINE_ENABLE, "baseline.enable")                            \
    Register(OFFTHREAD_COMPILATION_ENABLE, "offthread-compilation.enable")  \
    Register(JUMP_THRESHOLD, "jump-threshold")                              \
    Register(UNBOXED_OBJECTS, "unboxed_objects")                            \
    Register(ASMJS_ATOMICS_ENABLE, "asmjs.atomics.enable")                  \
    Register(WASM_TEST_MODE, "wasm.test-mode")                              \
    Register(WASM_FOLD_OFFSETS, "wasm.fold-offsets")

typedef enum JSJitCompilerOption {
#define JIT_COMPILER_DECLARE(key, str) \
    JSJITCOMPILER_ ## key,

    JIT_COMPILER_OPTIONS(JIT_COMPILER_DECLARE)
#undef JIT_COMPILER_DECLARE

    JSJITCOMPILER_NOT_AN_OPTION
} JSJitCompilerOption;

extern JS_PUBLIC_API(void)
JS_SetGlobalJitCompilerOption(JSContext* cx, JSJitCompilerOption opt, uint32_t value);
extern JS_PUBLIC_API(bool)
JS_GetGlobalJitCompilerOption(JSContext* cx, JSJitCompilerOption opt, uint32_t* valueOut);

/**
 * Convert a uint32_t index into a jsid.
 */
extern JS_PUBLIC_API(bool)
JS_IndexToId(JSContext* cx, uint32_t index, JS::MutableHandleId);

/**
 * Convert chars into a jsid.
 *
 * |chars| may not be an index.
 */
extern JS_PUBLIC_API(bool)
JS_CharsToId(JSContext* cx, JS::TwoByteChars chars, JS::MutableHandleId);

/**
 *  Test if the given string is a valid ECMAScript identifier
 */
extern JS_PUBLIC_API(bool)
JS_IsIdentifier(JSContext* cx, JS::HandleString str, bool* isIdentifier);

/**
 * Test whether the given chars + length are a valid ECMAScript identifier.
 * This version is infallible, so just returns whether the chars are an
 * identifier.
 */
extern JS_PUBLIC_API(bool)
JS_IsIdentifier(const char16_t* chars, size_t length);

namespace js {
class ScriptSource;
} // namespace js

namespace JS {

class MOZ_RAII JS_PUBLIC_API(AutoFilename)
{
  private:
    js::ScriptSource* ss_;
    mozilla::Variant<const char*, UniqueChars> filename_;

    AutoFilename(const AutoFilename&) = delete;
    AutoFilename& operator=(const AutoFilename&) = delete;

  public:
    AutoFilename()
      : ss_(nullptr),
        filename_(mozilla::AsVariant<const char*>(nullptr))
    {}

    ~AutoFilename() {
        reset();
    }

    void reset();

    void setOwned(UniqueChars&& filename);
    void setUnowned(const char* filename);
    void setScriptSource(js::ScriptSource* ss);

    const char* get() const;
};

/**
 * Return the current filename, line number and column number of the most
 * currently running frame. Returns true if a scripted frame was found, false
 * otherwise.
 *
 * If a the embedding has hidden the scripted caller for the topmost activation
 * record, this will also return false.
 */
extern JS_PUBLIC_API(bool)
DescribeScriptedCaller(JSContext* cx, AutoFilename* filename = nullptr,
                       unsigned* lineno = nullptr, unsigned* column = nullptr);

extern JS_PUBLIC_API(JSObject*)
GetScriptedCallerGlobal(JSContext* cx);

/**
 * Informs the JS engine that the scripted caller should be hidden. This can be
 * used by the embedding to maintain an override of the scripted caller in its
 * calculations, by hiding the scripted caller in the JS engine and pushing data
 * onto a separate stack, which it inspects when DescribeScriptedCaller returns
 * null.
 *
 * We maintain a counter on each activation record. Add() increments the counter
 * of the topmost activation, and Remove() decrements it. The count may never
 * drop below zero, and must always be exactly zero when the activation is
 * popped from the stack.
 */
extern JS_PUBLIC_API(void)
HideScriptedCaller(JSContext* cx);

extern JS_PUBLIC_API(void)
UnhideScriptedCaller(JSContext* cx);

class MOZ_RAII AutoHideScriptedCaller
{
  public:
    explicit AutoHideScriptedCaller(JSContext* cx
                                    MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : mContext(cx)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
        HideScriptedCaller(mContext);
    }
    ~AutoHideScriptedCaller() {
        UnhideScriptedCaller(mContext);
    }

  protected:
    JSContext* mContext;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

/*
 * Encode/Decode interpreted scripts and functions to/from memory.
 */

typedef mozilla::Vector<uint8_t> TranscodeBuffer;

enum TranscodeResult
{
    // Successful encoding / decoding.
    TranscodeResult_Ok = 0,

    // A warning message, is set to the message out-param.
    TranscodeResult_Failure = 0x100,
    TranscodeResult_Failure_BadBuildId =          TranscodeResult_Failure | 0x1,
    TranscodeResult_Failure_RunOnceNotSupported = TranscodeResult_Failure | 0x2,
    TranscodeResult_Failure_AsmJSNotSupported =   TranscodeResult_Failure | 0x3,
    TranscodeResult_Failure_BadDecode =           TranscodeResult_Failure | 0x4,

    // A error, the JSContext has a pending exception.
    TranscodeResult_Throw = 0x200
};

extern JS_PUBLIC_API(TranscodeResult)
EncodeScript(JSContext* cx, TranscodeBuffer& buffer, JS::HandleScript script);

extern JS_PUBLIC_API(TranscodeResult)
EncodeInterpretedFunction(JSContext* cx, TranscodeBuffer& buffer, JS::HandleObject funobj);

extern JS_PUBLIC_API(TranscodeResult)
DecodeScript(JSContext* cx, TranscodeBuffer& buffer, JS::MutableHandleScript scriptp,
             size_t cursorIndex = 0);

extern JS_PUBLIC_API(TranscodeResult)
DecodeInterpretedFunction(JSContext* cx, TranscodeBuffer& buffer, JS::MutableHandleFunction funp,
                          size_t cursorIndex = 0);

} /* namespace JS */

namespace js {

enum class StackFormat { SpiderMonkey, V8, Default };

/*
 * Sets the format used for stringifying Error stacks.
 *
 * The default format is StackFormat::SpiderMonkey.  Use StackFormat::V8
 * in order to emulate V8's stack formatting.  StackFormat::Default can't be
 * used here.
 */
extern JS_PUBLIC_API(void)
SetStackFormat(JSContext* cx, StackFormat format);

extern JS_PUBLIC_API(StackFormat)
GetStackFormat(JSContext* cx);

}

namespace JS {

/*
 * This callback represents a request by the JS engine to open for reading the
 * existing cache entry for the given global and char range that may contain a
 * module. If a cache entry exists, the callback shall return 'true' and return
 * the size, base address and an opaque file handle as outparams. If the
 * callback returns 'true', the JS engine guarantees a call to
 * CloseAsmJSCacheEntryForReadOp, passing the same base address, size and
 * handle.
 */
typedef bool
(* OpenAsmJSCacheEntryForReadOp)(HandleObject global, const char16_t* begin, const char16_t* limit,
                                 size_t* size, const uint8_t** memory, intptr_t* handle);
typedef void
(* CloseAsmJSCacheEntryForReadOp)(size_t size, const uint8_t* memory, intptr_t handle);

/** The list of reasons why an asm.js module may not be stored in the cache. */
enum AsmJSCacheResult
{
    AsmJSCache_Success,
    AsmJSCache_MIN = AsmJSCache_Success,
    AsmJSCache_ModuleTooSmall,
    AsmJSCache_SynchronousScript,
    AsmJSCache_QuotaExceeded,
    AsmJSCache_StorageInitFailure,
    AsmJSCache_Disabled_Internal,
    AsmJSCache_Disabled_ShellFlags,
    AsmJSCache_Disabled_JitInspector,
    AsmJSCache_InternalError,
    AsmJSCache_Disabled_PrivateBrowsing,
    AsmJSCache_LIMIT
};

/*
 * This callback represents a request by the JS engine to open for writing a
 * cache entry of the given size for the given global and char range containing
 * the just-compiled module. If cache entry space is available, the callback
 * shall return 'true' and return the base address and an opaque file handle as
 * outparams. If the callback returns 'true', the JS engine guarantees a call
 * to CloseAsmJSCacheEntryForWriteOp passing the same base address, size and
 * handle.
 *
 * If 'installed' is true, then the cache entry is associated with a permanently
 * installed JS file (e.g., in a packaged webapp). This information allows the
 * embedding to store the cache entry in a installed location associated with
 * the principal of 'global' where it will not be evicted until the associated
 * installed JS file is removed.
 */
typedef AsmJSCacheResult
(* OpenAsmJSCacheEntryForWriteOp)(HandleObject global, bool installed,
                                  const char16_t* begin, const char16_t* end,
                                  size_t size, uint8_t** memory, intptr_t* handle);
typedef void
(* CloseAsmJSCacheEntryForWriteOp)(size_t size, uint8_t* memory, intptr_t handle);

struct AsmJSCacheOps
{
    OpenAsmJSCacheEntryForReadOp openEntryForRead;
    CloseAsmJSCacheEntryForReadOp closeEntryForRead;
    OpenAsmJSCacheEntryForWriteOp openEntryForWrite;
    CloseAsmJSCacheEntryForWriteOp closeEntryForWrite;
};

extern JS_PUBLIC_API(void)
SetAsmJSCacheOps(JSContext* cx, const AsmJSCacheOps* callbacks);

/**
 * Return the buildId (represented as a sequence of characters) associated with
 * the currently-executing build. If the JS engine is embedded such that a
 * single cache entry can be observed by different compiled versions of the JS
 * engine, it is critical that the buildId shall change for each new build of
 * the JS engine.
 */
typedef js::Vector<char, 0, js::SystemAllocPolicy> BuildIdCharVector;

typedef bool
(* BuildIdOp)(BuildIdCharVector* buildId);

extern JS_PUBLIC_API(void)
SetBuildIdOp(JSContext* cx, BuildIdOp buildIdOp);

/**
 * The WasmModule interface allows the embedding to hold a reference to the
 * underying C++ implementation of a JS WebAssembly.Module object for purposes
 * of (de)serialization off the object's JSRuntime's thread.
 *
 * - Serialization starts when WebAssembly.Module is passed to the
 * structured-clone algorithm. JS::GetWasmModule is called on the JSRuntime
 * thread that initiated the structured clone to get the JS::WasmModule.
 * This interface is then taken to a background thread where serializedSize()
 * and serialize() are called to write the object to two files: a bytecode file
 * that always allows successful deserialization and a compiled-code file keyed
 * on cpu- and build-id that may become invalid if either of these change between
 * serialization and deserialization. After serialization, the reference is
 * dropped from the background thread.
 *
 * - Deserialization starts when the structured clone algorithm encounters a
 * serialized WebAssembly.Module. On a background thread, the compiled-code file
 * is opened and CompiledWasmModuleAssumptionsMatch is called to see if it is
 * still valid (as described above). DeserializeWasmModule is then called to
 * construct a JS::WasmModule (also on the background thread), passing the
 * bytecode file descriptor and, if valid, the compiled-code file descriptor.
 * The JS::WasmObject is then transported to the JSRuntime thread (which
 * originated the request) and the wrapping WebAssembly.Module object is created
 * by calling createObject().
 */

struct WasmModule : mozilla::external::AtomicRefCounted<WasmModule>
{
    MOZ_DECLARE_REFCOUNTED_TYPENAME(WasmModule)
    virtual ~WasmModule() {}

    virtual void serializedSize(size_t* maybeBytecodeSize, size_t* maybeCompiledSize) const = 0;
    virtual void serialize(uint8_t* maybeBytecodeBegin, size_t maybeBytecodeSize,
                           uint8_t* maybeCompiledBegin, size_t maybeCompiledSize) const = 0;

    virtual JSObject* createObject(JSContext* cx) = 0;
};

extern JS_PUBLIC_API(bool)
IsWasmModuleObject(HandleObject obj);

extern JS_PUBLIC_API(RefPtr<WasmModule>)
GetWasmModule(HandleObject obj);

extern JS_PUBLIC_API(bool)
CompiledWasmModuleAssumptionsMatch(PRFileDesc* compiled, BuildIdCharVector&& buildId);

extern JS_PUBLIC_API(RefPtr<WasmModule>)
DeserializeWasmModule(PRFileDesc* bytecode, PRFileDesc* maybeCompiled, BuildIdCharVector&& buildId,
                      JS::UniqueChars filename, unsigned line, unsigned column);

/**
 * Convenience class for imitating a JS level for-of loop. Typical usage:
 *
 *     ForOfIterator it(cx);
 *     if (!it.init(iterable))
 *       return false;
 *     RootedValue val(cx);
 *     while (true) {
 *       bool done;
 *       if (!it.next(&val, &done))
 *         return false;
 *       if (done)
 *         break;
 *       if (!DoStuff(cx, val))
 *         return false;
 *     }
 */
class MOZ_STACK_CLASS JS_PUBLIC_API(ForOfIterator) {
  protected:
    JSContext* cx_;
    /*
     * Use the ForOfPIC on the global object (see vm/GlobalObject.h) to try
     * to optimize iteration across arrays.
     *
     *  Case 1: Regular Iteration
     *      iterator - pointer to the iterator object.
     *      index - fixed to NOT_ARRAY (== UINT32_MAX)
     *
     *  Case 2: Optimized Array Iteration
     *      iterator - pointer to the array object.
     *      index - current position in array.
     *
     * The cases are distinguished by whether or not |index| is equal to NOT_ARRAY.
     */
    JS::RootedObject iterator;
    uint32_t index;

    static const uint32_t NOT_ARRAY = UINT32_MAX;

    ForOfIterator(const ForOfIterator&) = delete;
    ForOfIterator& operator=(const ForOfIterator&) = delete;

  public:
    explicit ForOfIterator(JSContext* cx) : cx_(cx), iterator(cx_), index(NOT_ARRAY) { }

    enum NonIterableBehavior {
        ThrowOnNonIterable,
        AllowNonIterable
    };

    /**
     * Initialize the iterator.  If AllowNonIterable is passed then if getting
     * the @@iterator property from iterable returns undefined init() will just
     * return true instead of throwing.  Callers must then check
     * valueIsIterable() before continuing with the iteration.
     */
    bool init(JS::HandleValue iterable,
              NonIterableBehavior nonIterableBehavior = ThrowOnNonIterable);

    /**
     * Get the next value from the iterator.  If false *done is true
     * after this call, do not examine val.
     */
    bool next(JS::MutableHandleValue val, bool* done);

    /**
     * Close the iterator.
     * For the case that completion type is throw.
     */
    void closeThrow();

    /**
     * If initialized with throwOnNonCallable = false, check whether
     * the value is iterable.
     */
    bool valueIsIterable() const {
        return iterator;
    }

  private:
    inline bool nextFromOptimizedArray(MutableHandleValue val, bool* done);
    bool materializeArrayIterator();
};


/**
 * If a large allocation fails when calling pod_{calloc,realloc}CanGC, the JS
 * engine may call the large-allocation- failure callback, if set, to allow the
 * embedding to flush caches, possibly perform shrinking GCs, etc. to make some
 * room. The allocation will then be retried (and may still fail.)
 */

typedef void
(* LargeAllocationFailureCallback)(void* data);

extern JS_PUBLIC_API(void)
SetLargeAllocationFailureCallback(JSContext* cx, LargeAllocationFailureCallback afc, void* data);

/**
 * Unlike the error reporter, which is only called if the exception for an OOM
 * bubbles up and is not caught, the OutOfMemoryCallback is called immediately
 * at the OOM site to allow the embedding to capture the current state of heap
 * allocation before anything is freed. If the large-allocation-failure callback
 * is called at all (not all allocation sites call the large-allocation-failure
 * callback on failure), it is called before the out-of-memory callback; the
 * out-of-memory callback is only called if the allocation still fails after the
 * large-allocation-failure callback has returned.
 */

typedef void
(* OutOfMemoryCallback)(JSContext* cx, void* data);

extern JS_PUBLIC_API(void)
SetOutOfMemoryCallback(JSContext* cx, OutOfMemoryCallback cb, void* data);

/**
 * Capture all frames.
 */
struct AllFrames { };

/**
 * Capture at most this many frames.
 */
struct MaxFrames
{
    uint32_t maxFrames;

    explicit MaxFrames(uint32_t max)
      : maxFrames(max)
    {
        MOZ_ASSERT(max > 0);
    }
};

/**
 * Capture the first frame with the given principals. By default, do not
 * consider self-hosted frames with the given principals as satisfying the stack
 * capture.
 */
struct JS_PUBLIC_API(FirstSubsumedFrame)
{
    JSContext* cx;
    JSPrincipals* principals;
    bool ignoreSelfHosted;

    /**
     * Use the cx's current compartment's principals.
     */
    explicit FirstSubsumedFrame(JSContext* cx, bool ignoreSelfHostedFrames = true);

    explicit FirstSubsumedFrame(JSContext* ctx, JSPrincipals* p, bool ignoreSelfHostedFrames = true)
      : cx(ctx)
      , principals(p)
      , ignoreSelfHosted(ignoreSelfHostedFrames)
    {
        if (principals)
            JS_HoldPrincipals(principals);
    }

    // No copying because we want to avoid holding and dropping principals
    // unnecessarily.
    FirstSubsumedFrame(const FirstSubsumedFrame&) = delete;
    FirstSubsumedFrame& operator=(const FirstSubsumedFrame&) = delete;

    FirstSubsumedFrame(FirstSubsumedFrame&& rhs)
      : principals(rhs.principals)
      , ignoreSelfHosted(rhs.ignoreSelfHosted)
    {
        MOZ_ASSERT(this != &rhs, "self move disallowed");
        rhs.principals = nullptr;
    }

    FirstSubsumedFrame& operator=(FirstSubsumedFrame&& rhs) {
        new (this) FirstSubsumedFrame(mozilla::Move(rhs));
        return *this;
    }

    ~FirstSubsumedFrame() {
        if (principals)
            JS_DropPrincipals(cx, principals);
    }
};

using StackCapture = mozilla::Variant<AllFrames, MaxFrames, FirstSubsumedFrame>;

/**
 * Capture the current call stack as a chain of SavedFrame JSObjects, and set
 * |stackp| to the SavedFrame for the youngest stack frame, or nullptr if there
 * are no JS frames on the stack.
 *
 * The |capture| parameter describes the portion of the JS stack to capture:
 *
 *   * |JS::AllFrames|: Capture all frames on the stack.
 *
 *   * |JS::MaxFrames|: Capture no more than |JS::MaxFrames::maxFrames| from the
 *      stack.
 *
 *   * |JS::FirstSubsumedFrame|: Capture the first frame whose principals are
 *     subsumed by |JS::FirstSubsumedFrame::principals|. By default, do not
 *     consider self-hosted frames; this can be controlled via the
 *     |JS::FirstSubsumedFrame::ignoreSelfHosted| flag. Do not capture any async
 *     stack.
 */
extern JS_PUBLIC_API(bool)
CaptureCurrentStack(JSContext* cx, MutableHandleObject stackp,
                    StackCapture&& capture = StackCapture(AllFrames()));

/*
 * This is a utility function for preparing an async stack to be used
 * by some other object.  This may be used when you need to treat a
 * given stack trace as an async parent.  If you just need to capture
 * the current stack, async parents and all, use CaptureCurrentStack
 * instead.
 *
 * Here |asyncStack| is the async stack to prepare.  It is copied into
 * |cx|'s current compartment, and the newest frame is given
 * |asyncCause| as its asynchronous cause.  If |maxFrameCount| is
 * non-zero, capture at most the youngest |maxFrameCount| frames.  The
 * new stack object is written to |stackp|.  Returns true on success,
 * or sets an exception and returns |false| on error.
 */
extern JS_PUBLIC_API(bool)
CopyAsyncStack(JSContext* cx, HandleObject asyncStack,
               HandleString asyncCause, MutableHandleObject stackp,
               unsigned maxFrameCount);

/*
 * Accessors for working with SavedFrame JSObjects
 *
 * Each of these functions assert that if their `HandleObject savedFrame`
 * argument is non-null, its JSClass is the SavedFrame class (or it is a
 * cross-compartment or Xray wrapper around an object with the SavedFrame class)
 * and the object is not the SavedFrame.prototype object.
 *
 * Each of these functions will find the first SavedFrame object in the chain
 * whose underlying stack frame principals are subsumed by the cx's current
 * compartment's principals, and operate on that SavedFrame object. This
 * prevents leaking information about privileged frames to un-privileged
 * callers. As a result, the SavedFrame in parameters do _NOT_ need to be in the
 * same compartment as the cx, and the various out parameters are _NOT_
 * guaranteed to be in the same compartment as cx.
 *
 * You may consider or skip over self-hosted frames by passing
 * `SavedFrameSelfHosted::Include` or `SavedFrameSelfHosted::Exclude`
 * respectively.
 *
 * Additionally, it may be the case that there is no such SavedFrame object
 * whose captured frame's principals are subsumed by the caller's compartment's
 * principals! If the `HandleObject savedFrame` argument is null, or the
 * caller's principals do not subsume any of the chained SavedFrame object's
 * principals, `SavedFrameResult::AccessDenied` is returned and a (hopefully)
 * sane default value is chosen for the out param.
 *
 * See also `js/src/doc/SavedFrame/SavedFrame.md`.
 */

enum class SavedFrameResult {
    Ok,
    AccessDenied
};

enum class SavedFrameSelfHosted {
    Include,
    Exclude
};

/**
 * Given a SavedFrame JSObject, get its source property. Defaults to the empty
 * string.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameSource(JSContext* cx, HandleObject savedFrame, MutableHandleString sourcep,
                    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its line property. Defaults to 0.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameLine(JSContext* cx, HandleObject savedFrame, uint32_t* linep,
                  SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its column property. Defaults to 0.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameColumn(JSContext* cx, HandleObject savedFrame, uint32_t* columnp,
                    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its functionDisplayName string, or nullptr
 * if SpiderMonkey was unable to infer a name for the captured frame's
 * function. Defaults to nullptr.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameFunctionDisplayName(JSContext* cx, HandleObject savedFrame, MutableHandleString namep,
                                 SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its asyncCause string. Defaults to nullptr.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameAsyncCause(JSContext* cx, HandleObject savedFrame, MutableHandleString asyncCausep,
                        SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its asyncParent SavedFrame object or nullptr
 * if there is no asyncParent. The `asyncParentp` out parameter is _NOT_
 * guaranteed to be in the cx's compartment. Defaults to nullptr.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameAsyncParent(JSContext* cx, HandleObject savedFrame, MutableHandleObject asyncParentp,
                SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject, get its parent SavedFrame object or nullptr if
 * it is the oldest frame in the stack. The `parentp` out parameter is _NOT_
 * guaranteed to be in the cx's compartment. Defaults to nullptr.
 */
extern JS_PUBLIC_API(SavedFrameResult)
GetSavedFrameParent(JSContext* cx, HandleObject savedFrame, MutableHandleObject parentp,
                    SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);

/**
 * Given a SavedFrame JSObject stack, stringify it in the same format as
 * Error.prototype.stack. The stringified stack out parameter is placed in the
 * cx's compartment. Defaults to the empty string.
 *
 * The same notes above about SavedFrame accessors applies here as well: cx
 * doesn't need to be in stack's compartment, and stack can be null, a
 * SavedFrame object, or a wrapper (CCW or Xray) around a SavedFrame object.
 *
 * Optional indent parameter specifies the number of white spaces to indent
 * each line.
 */
extern JS_PUBLIC_API(bool)
BuildStackString(JSContext* cx, HandleObject stack, MutableHandleString stringp,
                 size_t indent = 0, js::StackFormat stackFormat = js::StackFormat::Default);

/**
 * Return true iff the given object is either a SavedFrame object or wrapper
 * around a SavedFrame object, and it is not the SavedFrame.prototype object.
 */
extern JS_PUBLIC_API(bool)
IsSavedFrame(JSObject* obj);

} /* namespace JS */


/* Stopwatch-based performance monitoring. */

namespace js {

class AutoStopwatch;

/**
 * Abstract base class for a representation of the performance of a
 * component. Embeddings interested in performance monitoring should
 * provide a concrete implementation of this class, as well as the
 * relevant callbacks (see below).
 */
struct JS_PUBLIC_API(PerformanceGroup) {
    PerformanceGroup();

    // The current iteration of the event loop.
    uint64_t iteration() const;

    // `true` if an instance of `AutoStopwatch` is already monitoring
    // the performance of this performance group for this iteration
    // of the event loop, `false` otherwise.
    bool isAcquired(uint64_t it) const;

    // `true` if a specific instance of `AutoStopwatch` is already monitoring
    // the performance of this performance group for this iteration
    // of the event loop, `false` otherwise.
    bool isAcquired(uint64_t it, const AutoStopwatch* owner) const;

    // Mark that an instance of `AutoStopwatch` is monitoring
    // the performance of this group for a given iteration.
    void acquire(uint64_t it, const AutoStopwatch* owner);

    // Mark that no `AutoStopwatch` is monitoring the
    // performance of this group for the iteration.
    void release(uint64_t it, const AutoStopwatch* owner);

    // The number of cycles spent in this group during this iteration
    // of the event loop. Note that cycles are not a reliable measure,
    // especially over short intervals. See Stopwatch.* for a more
    // complete discussion on the imprecision of cycle measurement.
    uint64_t recentCycles(uint64_t iteration) const;
    void addRecentCycles(uint64_t iteration, uint64_t cycles);

    // The number of times this group has been activated during this
    // iteration of the event loop.
    uint64_t recentTicks(uint64_t iteration) const;
    void addRecentTicks(uint64_t iteration, uint64_t ticks);

    // The number of microseconds spent doing CPOW during this
    // iteration of the event loop.
    uint64_t recentCPOW(uint64_t iteration) const;
    void addRecentCPOW(uint64_t iteration, uint64_t CPOW);

    // Get rid of any data that pretends to be recent.
    void resetRecentData();

    // `true` if new measures should be added to this group, `false`
    // otherwise.
    bool isActive() const;
    void setIsActive(bool);

    // `true` if this group has been used in the current iteration,
    // `false` otherwise.
    bool isUsedInThisIteration() const;
    void setIsUsedInThisIteration(bool);
  protected:
    // An implementation of `delete` for this object. Must be provided
    // by the embedding.
    virtual void Delete() = 0;

  private:
    // The number of cycles spent in this group during this iteration
    // of the event loop. Note that cycles are not a reliable measure,
    // especially over short intervals. See Runtime.cpp for a more
    // complete discussion on the imprecision of cycle measurement.
    uint64_t recentCycles_;

    // The number of times this group has been activated during this
    // iteration of the event loop.
    uint64_t recentTicks_;

    // The number of microseconds spent doing CPOW during this
    // iteration of the event loop.
    uint64_t recentCPOW_;

    // The current iteration of the event loop. If necessary,
    // may safely overflow.
    uint64_t iteration_;

    // `true` if new measures should be added to this group, `false`
    // otherwise.
    bool isActive_;

    // `true` if this group has been used in the current iteration,
    // `false` otherwise.
    bool isUsedInThisIteration_;

    // The stopwatch currently monitoring the group,
    // or `nullptr` if none. Used ony for comparison.
    const AutoStopwatch* owner_;

  public:
    // Compatibility with RefPtr<>
    void AddRef();
    void Release();
    uint64_t refCount_;
};

using PerformanceGroupVector = mozilla::Vector<RefPtr<js::PerformanceGroup>, 8, SystemAllocPolicy>;

/**
 * Commit any Performance Monitoring data.
 *
 * Until `FlushMonitoring` has been called, all PerformanceMonitoring data is invisible
 * to the outside world and can cancelled with a call to `ResetMonitoring`.
 */
extern JS_PUBLIC_API(bool)
FlushPerformanceMonitoring(JSContext*);

/**
 * Cancel any measurement that hasn't been committed.
 */
extern JS_PUBLIC_API(void)
ResetPerformanceMonitoring(JSContext*);

/**
 * Cleanup any memory used by performance monitoring.
 */
extern JS_PUBLIC_API(void)
DisposePerformanceMonitoring(JSContext*);

/**
 * Turn on/off stopwatch-based CPU monitoring.
 *
 * `SetStopwatchIsMonitoringCPOW` or `SetStopwatchIsMonitoringJank`
 * may return `false` if monitoring could not be activated, which may
 * happen if we are out of memory.
 */
extern JS_PUBLIC_API(bool)
SetStopwatchIsMonitoringCPOW(JSContext*, bool);
extern JS_PUBLIC_API(bool)
GetStopwatchIsMonitoringCPOW(JSContext*);
extern JS_PUBLIC_API(bool)
SetStopwatchIsMonitoringJank(JSContext*, bool);
extern JS_PUBLIC_API(bool)
GetStopwatchIsMonitoringJank(JSContext*);


/**
 * Add a number of microseconds to the time spent waiting on CPOWs
 * since process start.
 */
extern JS_PUBLIC_API(void)
AddCPOWPerformanceDelta(JSContext*, uint64_t delta);

typedef bool
(*StopwatchStartCallback)(uint64_t, void*);
extern JS_PUBLIC_API(bool)
SetStopwatchStartCallback(JSContext*, StopwatchStartCallback, void*);

typedef bool
(*StopwatchCommitCallback)(uint64_t, PerformanceGroupVector&, void*);
extern JS_PUBLIC_API(bool)
SetStopwatchCommitCallback(JSContext*, StopwatchCommitCallback, void*);

typedef bool
(*GetGroupsCallback)(JSContext*, PerformanceGroupVector&, void*);
extern JS_PUBLIC_API(bool)
SetGetPerformanceGroupsCallback(JSContext*, GetGroupsCallback, void*);

} /* namespace js */

namespace js {

enum class CompletionKind {
    Normal,
    Return,
    Throw
};

} /* namespace js */

#endif /* jsapi_h */