DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (5216dd412535)

VCS Links

Line Code
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sw=4 et tw=78:
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef jsapi_h___
#define jsapi_h___
/*
 * JavaScript API.
 */
#include <stddef.h>
#include <stdio.h>
#include "js-config.h"
#include "jspubtd.h"
#include "jsutil.h"

JS_BEGIN_EXTERN_C

/*
 * In release builds, jsval and jsid are defined to be integral types. This
 * prevents many bugs from being caught at compile time. E.g.:
 *
 *  jsval v = ...
 *  if (v == JS_TRUE)  // error
 *    ...
 *
 *  jsid id = v;       // error
 *
 * To catch more errors, jsval and jsid are given struct types in debug builds.
 * Struct assignment and (in C++) operator== allow correct code to be mostly
 * oblivious to the change. This feature can be explicitly disabled in debug
 * builds by defining JS_NO_JSVAL_JSID_STRUCT_TYPES.
 */
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES

/* Well-known JS values. N.B. These constants are initialized at startup. */
extern JS_PUBLIC_DATA(jsval) JSVAL_NULL;
extern JS_PUBLIC_DATA(jsval) JSVAL_ZERO;
extern JS_PUBLIC_DATA(jsval) JSVAL_ONE;
extern JS_PUBLIC_DATA(jsval) JSVAL_FALSE;
extern JS_PUBLIC_DATA(jsval) JSVAL_TRUE;
extern JS_PUBLIC_DATA(jsval) JSVAL_VOID;

#else

/* Well-known JS values. */
#define JSVAL_NULL   BUILD_JSVAL(JSVAL_TAG_NULL,      0)
#define JSVAL_ZERO   BUILD_JSVAL(JSVAL_TAG_INT32,     0)
#define JSVAL_ONE    BUILD_JSVAL(JSVAL_TAG_INT32,     1)
#define JSVAL_FALSE  BUILD_JSVAL(JSVAL_TAG_BOOLEAN,   JS_FALSE)
#define JSVAL_TRUE   BUILD_JSVAL(JSVAL_TAG_BOOLEAN,   JS_TRUE)
#define JSVAL_VOID   BUILD_JSVAL(JSVAL_TAG_UNDEFINED, 0)

#endif

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

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_NULL_IMPL(l);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_VOID(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_UNDEFINED_IMPL(l);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_INT32_IMPL(l);
}

static JS_ALWAYS_INLINE jsint
JSVAL_TO_INT(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_INT(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_INT32_IMPL(l);
}

#define JSVAL_INT_BITS          32
#define JSVAL_INT_MIN           ((jsint)0x80000000)
#define JSVAL_INT_MAX           ((jsint)0x7fffffff)

static JS_ALWAYS_INLINE jsval
INT_TO_JSVAL(int32 i)
{
    return IMPL_TO_JSVAL(INT32_TO_JSVAL_IMPL(i));
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_DOUBLE_IMPL(l);
}

static JS_ALWAYS_INLINE jsdouble
JSVAL_TO_DOUBLE(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_DOUBLE(v));
    l.asBits = JSVAL_BITS(v);
    return l.asDouble;
}

static JS_ALWAYS_INLINE jsval
DOUBLE_TO_JSVAL(jsdouble d)
{
    d = JS_CANONICALIZE_NAN(d);
    return IMPL_TO_JSVAL(DOUBLE_TO_JSVAL_IMPL(d));
}

static JS_ALWAYS_INLINE jsval
UINT_TO_JSVAL(uint32 i)
{
    if (i <= JSVAL_INT_MAX)
        return INT_TO_JSVAL((int32)i);
    return DOUBLE_TO_JSVAL((jsdouble)i);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_NUMBER_IMPL(l);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_STRING_IMPL(l);
}

static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_STRING(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_STRING_IMPL(l);
}

static JS_ALWAYS_INLINE jsval
STRING_TO_JSVAL(JSString *str)
{
    return IMPL_TO_JSVAL(STRING_TO_JSVAL_IMPL(str));
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_OBJECT_OR_NULL_IMPL(l);
}

static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_OBJECT(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_OBJECT_IMPL(l);
}

static JS_ALWAYS_INLINE jsval
OBJECT_TO_JSVAL(JSObject *obj)
{
    if (obj)
        return IMPL_TO_JSVAL(OBJECT_TO_JSVAL_IMPL(obj));
    return JSVAL_NULL;
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_BOOLEAN_IMPL(l);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_BOOLEAN(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_BOOLEAN_IMPL(l);
}

static JS_ALWAYS_INLINE jsval
BOOLEAN_TO_JSVAL(JSBool b)
{
    return IMPL_TO_JSVAL(BOOLEAN_TO_JSVAL_IMPL(b));
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_PRIMITIVE_IMPL(l);
}

static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_GCTHING_IMPL(l);
}

static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_GCTHING(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_GCTHING_IMPL(l);
}

/* To be GC-safe, privates are tagged as doubles. */

static JS_ALWAYS_INLINE jsval
PRIVATE_TO_JSVAL(void *ptr)
{
    return IMPL_TO_JSVAL(PRIVATE_PTR_TO_JSVAL_IMPL(ptr));
}

static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_DOUBLE(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TO_PRIVATE_PTR_IMPL(l);
}

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

/*
 * A jsid is an identifier for a property or method of an object which is
 * either a 31-bit signed integer, interned string or object. If XML is
 * enabled, there is an additional singleton jsid value; see
 * JS_DEFAULT_XML_NAMESPACE_ID below. Finally, there is an additional jsid
 * value, JSID_VOID, which does not occur in JS scripts but may be used to
 * indicate the absence of a valid jsid.
 *
 * A jsid is not implicitly convertible to or from a jsval; JS_ValueToId or
 * JS_IdToValue must be used instead.
 */

#define JSID_TYPE_STRING                 0x0
#define JSID_TYPE_INT                    0x1
#define JSID_TYPE_VOID                   0x2
#define JSID_TYPE_OBJECT                 0x4
#define JSID_TYPE_DEFAULT_XML_NAMESPACE  0x6
#define JSID_TYPE_MASK                   0x7

/*
 * Avoid using canonical 'id' for jsid parameters since this is a magic word in
 * Objective-C++ which, apparently, wants to be able to #include jsapi.h.
 */
#define id iden

static JS_ALWAYS_INLINE JSBool
JSID_IS_STRING(jsid id)
{
    return (JSID_BITS(id) & JSID_TYPE_MASK) == 0;
}

static JS_ALWAYS_INLINE JSString *
JSID_TO_STRING(jsid id)
{
    JS_ASSERT(JSID_IS_STRING(id));
    return (JSString *)(JSID_BITS(id));
}

static JS_ALWAYS_INLINE JSBool
JSID_IS_ZERO(jsid id)
{
    return JSID_BITS(id) == 0;
}

JS_PUBLIC_API(JSBool)
JS_StringHasBeenInterned(JSString *str);

/* A jsid may only hold an interned JSString. */
static JS_ALWAYS_INLINE jsid
INTERNED_STRING_TO_JSID(JSString *str)
{
    jsid id;
    JS_ASSERT(str);
    JS_ASSERT(JS_StringHasBeenInterned(str));
    JS_ASSERT(((size_t)str & JSID_TYPE_MASK) == 0);
    JSID_BITS(id) = (size_t)str;
    return id;
}

static JS_ALWAYS_INLINE JSBool
JSID_IS_INT(jsid id)
{
    return !!(JSID_BITS(id) & JSID_TYPE_INT);
}

static JS_ALWAYS_INLINE int32
JSID_TO_INT(jsid id)
{
    JS_ASSERT(JSID_IS_INT(id));
    return ((int32)JSID_BITS(id)) >> 1;
}

/*
 * Note: when changing these values, verify that their use in
 * js_CheckForStringIndex is still valid.
 */
#define JSID_INT_MIN  (-(1 << 30))
#define JSID_INT_MAX  ((1 << 30) - 1)

static JS_ALWAYS_INLINE JSBool
INT_FITS_IN_JSID(int32 i)
{
    return ((jsuint)(i) - (jsuint)JSID_INT_MIN <=
            (jsuint)(JSID_INT_MAX - JSID_INT_MIN));
}

static JS_ALWAYS_INLINE jsid
INT_TO_JSID(int32 i)
{
    jsid id;
    JS_ASSERT(INT_FITS_IN_JSID(i));
    JSID_BITS(id) = ((i << 1) | JSID_TYPE_INT);
    return id;
}

static JS_ALWAYS_INLINE JSBool
JSID_IS_OBJECT(jsid id)
{
    return (JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_OBJECT &&
           (size_t)JSID_BITS(id) != JSID_TYPE_OBJECT;
}

static JS_ALWAYS_INLINE JSObject *
JSID_TO_OBJECT(jsid id)
{
    JS_ASSERT(JSID_IS_OBJECT(id));
    return (JSObject *)(JSID_BITS(id) & ~(size_t)JSID_TYPE_MASK);
}

static JS_ALWAYS_INLINE jsid
OBJECT_TO_JSID(JSObject *obj)
{
    jsid id;
    JS_ASSERT(obj != NULL);
    JS_ASSERT(((size_t)obj & JSID_TYPE_MASK) == 0);
    JSID_BITS(id) = ((size_t)obj | JSID_TYPE_OBJECT);
    return id;
}

static JS_ALWAYS_INLINE JSBool
JSID_IS_GCTHING(jsid id)
{
    return JSID_IS_STRING(id) || JSID_IS_OBJECT(id);
}

static JS_ALWAYS_INLINE void *
JSID_TO_GCTHING(jsid id)
{
    return (void *)(JSID_BITS(id) & ~(size_t)JSID_TYPE_MASK);
}

/*
 * The magic XML namespace id is not a valid jsid. Global object classes in
 * embeddings that enable JS_HAS_XML_SUPPORT (E4X) should handle this id.
 */

static JS_ALWAYS_INLINE JSBool
JSID_IS_DEFAULT_XML_NAMESPACE(jsid id)
{
    JS_ASSERT_IF(((size_t)JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_DEFAULT_XML_NAMESPACE,
                 JSID_BITS(id) == JSID_TYPE_DEFAULT_XML_NAMESPACE);
    return ((size_t)JSID_BITS(id) == JSID_TYPE_DEFAULT_XML_NAMESPACE);
}

#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
extern JS_PUBLIC_DATA(jsid) JS_DEFAULT_XML_NAMESPACE_ID;
#else
#define JS_DEFAULT_XML_NAMESPACE_ID ((jsid)JSID_TYPE_DEFAULT_XML_NAMESPACE)
#endif

/*
 * A void jsid is not a valid id and only arises as an exceptional API return
 * value, such as in JS_NextProperty. Embeddings must not pass JSID_VOID into
 * JSAPI entry points expecting a jsid and do not need to handle JSID_VOID in
 * hooks receiving a jsid except when explicitly noted in the API contract.
 */

static JS_ALWAYS_INLINE JSBool
JSID_IS_VOID(jsid id)
{
    JS_ASSERT_IF(((size_t)JSID_BITS(id) & JSID_TYPE_MASK) == JSID_TYPE_VOID,
                 JSID_BITS(id) == JSID_TYPE_VOID);
    return ((size_t)JSID_BITS(id) == JSID_TYPE_VOID);
}

static JS_ALWAYS_INLINE JSBool
JSID_IS_EMPTY(jsid id)
{
    return ((size_t)JSID_BITS(id) == JSID_TYPE_OBJECT);
}

#undef id

#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
extern JS_PUBLIC_DATA(jsid) JSID_VOID;
extern JS_PUBLIC_DATA(jsid) JSID_EMPTY;
#else
# define JSID_VOID      ((jsid)JSID_TYPE_VOID)
# define JSID_EMPTY     ((jsid)JSID_TYPE_OBJECT)
#endif

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

/* Lock and unlock the GC thing held by a jsval. */
#define JSVAL_LOCK(cx,v)        (JSVAL_IS_GCTHING(v)                          \
                                 ? JS_LockGCThing(cx, JSVAL_TO_GCTHING(v))    \
                                 : JS_TRUE)
#define JSVAL_UNLOCK(cx,v)      (JSVAL_IS_GCTHING(v)                          \
                                 ? JS_UnlockGCThing(cx, JSVAL_TO_GCTHING(v))  \
                                 : JS_TRUE)

/* Property attributes, set in JSPropertySpec and passed to API functions. */
#define JSPROP_ENUMERATE        0x01    /* property is visible to for/in loop */
#define JSPROP_READONLY         0x02    /* not settable: assignment is no-op */
#define JSPROP_PERMANENT        0x04    /* property cannot be deleted */
#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_INDEX            0x80    /* name is actually (jsint) index */
#define JSPROP_SHORTID          0x100   /* set in JSPropertyDescriptor.attrs
                                           if getters/setters use a shortid */

/* Function flags, set in JSFunctionSpec and passed to JS_NewFunction etc. */
#define JSFUN_LAMBDA            0x08    /* expressed, not declared, function */
#define JSFUN_HEAVYWEIGHT       0x80    /* activation requires a Call object */

#define JSFUN_HEAVYWEIGHT_TEST(f)  ((f) & JSFUN_HEAVYWEIGHT)

/* 0x0100 is unused */
#define JSFUN_CONSTRUCTOR     0x0200    /* native that can be called as a ctor
                                           without creating a this object */

#define JSFUN_FLAGS_MASK      0x07f8    /* overlay JSFUN_* attributes --
                                           bits 12-15 are used internally to
                                           flag interpreted functions */

#define JSFUN_STUB_GSOPS      0x1000    /* use JS_PropertyStub getter/setter
                                           instead of defaulting to class gsops
                                           for property holding function */

/*
 * Re-use JSFUN_LAMBDA, which applies only to scripted functions, for use in
 * JSFunctionSpec arrays that specify generic native prototype methods, i.e.,
 * methods of a class prototype that are exposed as static methods taking an
 * extra leading argument: the generic |this| parameter.
 *
 * If you set this flag in a JSFunctionSpec struct's flags initializer, then
 * that struct must live at least as long as the native static method object
 * created due to this flag by JS_DefineFunctions or JS_InitClass.  Typically
 * JSFunctionSpec structs are allocated in static arrays.
 */
#define JSFUN_GENERIC_NATIVE    JSFUN_LAMBDA

/*
 * Microseconds since the epoch, midnight, January 1, 1970 UTC.  See the
 * comment in jstypes.h regarding safe int64 usage.
 */
extern JS_PUBLIC_API(int64)
JS_Now(void);

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

extern JS_PUBLIC_API(jsval)
JS_GetNegativeInfinityValue(JSContext *cx);

extern JS_PUBLIC_API(jsval)
JS_GetPositiveInfinityValue(JSContext *cx);

extern JS_PUBLIC_API(jsval)
JS_GetEmptyStringValue(JSContext *cx);

extern JS_PUBLIC_API(JSString *)
JS_GetEmptyString(JSRuntime *rt);

/*
 * Format is a string of the following characters (spaces are insignificant),
 * specifying the tabulated type conversions:
 *
 *   b      JSBool          Boolean
 *   c      uint16/jschar   ECMA uint16, Unicode char
 *   i      int32           ECMA int32
 *   u      uint32          ECMA uint32
 *   j      int32           Rounded int32 (coordinate)
 *   d      jsdouble        IEEE double
 *   I      jsdouble        Integral IEEE double
 *   S      JSString *      Unicode string, accessed by a JSString pointer
 *   W      jschar *        Unicode character vector, 0-terminated (W for wide)
 *   o      JSObject *      Object reference
 *   f      JSFunction *    Function private
 *   v      jsval           Argument value (no conversion)
 *   *      N/A             Skip this argument (no vararg)
 *   /      N/A             End of required arguments
 *
 * The variable argument list after format must consist of &b, &c, &s, e.g.,
 * where those variables have the types given above.  For the pointer types
 * char *, JSString *, and JSObject *, the pointed-at memory returned belongs
 * to the JS runtime, not to the calling native code.  The runtime promises
 * to keep this memory valid so long as argv refers to allocated stack space
 * (so long as the native function is active).
 *
 * Fewer arguments than format specifies may be passed only if there is a /
 * in format after the last required argument specifier and argc is at least
 * the number of required arguments.  More arguments than format specifies
 * may be passed without error; it is up to the caller to deal with trailing
 * unconverted arguments.
 */
extern JS_PUBLIC_API(JSBool)
JS_ConvertArguments(JSContext *cx, uintN argc, jsval *argv, const char *format,
                    ...);

#ifdef va_start
extern JS_PUBLIC_API(JSBool)
JS_ConvertArgumentsVA(JSContext *cx, uintN argc, jsval *argv,
                      const char *format, va_list ap);
#endif

#ifdef JS_ARGUMENT_FORMATTER_DEFINED

/*
 * Add and remove a format string handler for JS_{Convert,Push}Arguments{,VA}.
 * The handler function has this signature (see jspubtd.h):
 *
 *   JSBool MyArgumentFormatter(JSContext *cx, const char *format,
 *                              JSBool fromJS, jsval **vpp, va_list *app);
 *
 * It should return true on success, and return false after reporting an error
 * or detecting an already-reported error.
 *
 * For a given format string, for example "AA", the formatter is called from
 * JS_ConvertArgumentsVA like so:
 *
 *   formatter(cx, "AA...", JS_TRUE, &sp, &ap);
 *
 * sp points into the arguments array on the JS stack, while ap points into
 * the stdarg.h va_list on the C stack.  The JS_TRUE passed for fromJS tells
 * the formatter to convert zero or more jsvals at sp to zero or more C values
 * accessed via pointers-to-values at ap, updating both sp (via *vpp) and ap
 * (via *app) to point past the converted arguments and their result pointers
 * on the C stack.
 *
 * When called from JS_PushArgumentsVA, the formatter is invoked thus:
 *
 *   formatter(cx, "AA...", JS_FALSE, &sp, &ap);
 *
 * where JS_FALSE for fromJS means to wrap the C values at ap according to the
 * format specifier and store them at sp, updating ap and sp appropriately.
 *
 * The "..." after "AA" is the rest of the format string that was passed into
 * JS_{Convert,Push}Arguments{,VA}.  The actual format trailing substring used
 * in each Convert or PushArguments call is passed to the formatter, so that
 * one such function may implement several formats, in order to share code.
 *
 * Remove just forgets about any handler associated with format.  Add does not
 * copy format, it points at the string storage allocated by the caller, which
 * is typically a string constant.  If format is in dynamic storage, it is up
 * to the caller to keep the string alive until Remove is called.
 */
extern JS_PUBLIC_API(JSBool)
JS_AddArgumentFormatter(JSContext *cx, const char *format,
                        JSArgumentFormatter formatter);

extern JS_PUBLIC_API(void)
JS_RemoveArgumentFormatter(JSContext *cx, const char *format);

#endif /* JS_ARGUMENT_FORMATTER_DEFINED */

extern JS_PUBLIC_API(JSBool)
JS_ConvertValue(JSContext *cx, jsval v, JSType type, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_ValueToObject(JSContext *cx, jsval v, JSObject **objp);

extern JS_PUBLIC_API(JSFunction *)
JS_ValueToFunction(JSContext *cx, jsval v);

extern JS_PUBLIC_API(JSFunction *)
JS_ValueToConstructor(JSContext *cx, jsval v);

extern JS_PUBLIC_API(JSString *)
JS_ValueToString(JSContext *cx, jsval v);

extern JS_PUBLIC_API(JSString *)
JS_ValueToSource(JSContext *cx, jsval v);

extern JS_PUBLIC_API(JSBool)
JS_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);

extern JS_PUBLIC_API(JSBool)
JS_DoubleIsInt32(jsdouble d, jsint *ip);

/*
 * Convert a value to a number, then to an int32, according to the ECMA rules
 * for ToInt32.
 */
extern JS_PUBLIC_API(JSBool)
JS_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);

/*
 * Convert a value to a number, then to a uint32, according to the ECMA rules
 * for ToUint32.
 */
extern JS_PUBLIC_API(JSBool)
JS_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);

/*
 * Convert a value to a number, then to an int32 if it fits by rounding to
 * nearest; but failing with an error report if the double is out of range
 * or unordered.
 */
extern JS_PUBLIC_API(JSBool)
JS_ValueToInt32(JSContext *cx, jsval v, int32 *ip);

/*
 * ECMA ToUint16, for mapping a jsval to a Unicode point.
 */
extern JS_PUBLIC_API(JSBool)
JS_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);

extern JS_PUBLIC_API(JSBool)
JS_ValueToBoolean(JSContext *cx, jsval v, JSBool *bp);

extern JS_PUBLIC_API(JSType)
JS_TypeOfValue(JSContext *cx, jsval v);

extern JS_PUBLIC_API(const char *)
JS_GetTypeName(JSContext *cx, JSType type);

extern JS_PUBLIC_API(JSBool)
JS_StrictlyEqual(JSContext *cx, jsval v1, jsval v2, JSBool *equal);

extern JS_PUBLIC_API(JSBool)
JS_SameValue(JSContext *cx, jsval v1, jsval v2, JSBool *same);

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

/*
 * Initialization, locking, contexts, and memory allocation.
 *
 * It is important that the first runtime and 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
 */
#define JS_NewRuntime       JS_Init
#define JS_DestroyRuntime   JS_Finish
#define JS_LockRuntime      JS_Lock
#define JS_UnlockRuntime    JS_Unlock

extern JS_PUBLIC_API(JSRuntime *)
JS_NewRuntime(uint32 maxbytes);

/* Deprecated. */
#define JS_CommenceRuntimeShutDown(rt) ((void) 0)

extern JS_PUBLIC_API(void)
JS_DestroyRuntime(JSRuntime *rt);

extern JS_PUBLIC_API(void)
JS_ShutDown(void);

JS_PUBLIC_API(void *)
JS_GetRuntimePrivate(JSRuntime *rt);

JS_PUBLIC_API(void)
JS_SetRuntimePrivate(JSRuntime *rt, void *data);

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

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

/* Yield to pending GC operations, regardless of request depth */
extern JS_PUBLIC_API(void)
JS_YieldRequest(JSContext *cx);

extern JS_PUBLIC_API(jsrefcount)
JS_SuspendRequest(JSContext *cx);

extern JS_PUBLIC_API(void)
JS_ResumeRequest(JSContext *cx, jsrefcount saveDepth);

extern JS_PUBLIC_API(JSBool)
JS_IsInRequest(JSContext *cx);

#ifdef __cplusplus
JS_END_EXTERN_C

class JSAutoRequest {
  public:
    JSAutoRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM)
        : mContext(cx), mSaveDepth(0) {
        JS_GUARD_OBJECT_NOTIFIER_INIT;
        JS_BeginRequest(mContext);
    }
    ~JSAutoRequest() {
        JS_EndRequest(mContext);
    }

    void suspend() {
        mSaveDepth = JS_SuspendRequest(mContext);
    }
    void resume() {
        JS_ResumeRequest(mContext, mSaveDepth);
    }

  protected:
    JSContext *mContext;
    jsrefcount mSaveDepth;
    JS_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
};

class JSAutoSuspendRequest {
  public:
    JSAutoSuspendRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM)
        : mContext(cx), mSaveDepth(0) {
        JS_GUARD_OBJECT_NOTIFIER_INIT;
        if (mContext) {
            mSaveDepth = JS_SuspendRequest(mContext);
        }
    }
    ~JSAutoSuspendRequest() {
        resume();
    }

    void resume() {
        if (mContext) {
            JS_ResumeRequest(mContext, mSaveDepth);
            mContext = 0;
        }
    }

  protected:
    JSContext *mContext;
    jsrefcount mSaveDepth;
    JS_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
};

class JSAutoCheckRequest {
  public:
    JSAutoCheckRequest(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM) {
#if defined JS_THREADSAFE && defined DEBUG
        mContext = cx;
        JS_ASSERT(JS_IsInRequest(cx));
#endif
        JS_GUARD_OBJECT_NOTIFIER_INIT;
    }

    ~JSAutoCheckRequest() {
#if defined JS_THREADSAFE && defined DEBUG
        JS_ASSERT(JS_IsInRequest(mContext));
#endif
    }


  private:
#if defined JS_THREADSAFE && defined DEBUG
    JSContext *mContext;
#endif
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};

JS_BEGIN_EXTERN_C
#endif

extern JS_PUBLIC_API(void)
JS_Lock(JSRuntime *rt);

extern JS_PUBLIC_API(void)
JS_Unlock(JSRuntime *rt);

extern JS_PUBLIC_API(JSContextCallback)
JS_SetContextCallback(JSRuntime *rt, JSContextCallback cxCallback);

extern JS_PUBLIC_API(JSContext *)
JS_NewContext(JSRuntime *rt, size_t stackChunkSize);

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

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

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

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

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

extern JS_PUBLIC_API(JSRuntime *)
JS_GetRuntime(JSContext *cx);

extern JS_PUBLIC_API(JSContext *)
JS_ContextIterator(JSRuntime *rt, JSContext **iterp);

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

extern JS_PUBLIC_API(JSVersion)
JS_SetVersion(JSContext *cx, JSVersion version);

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

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

/*
 * JS options are orthogonal to version, and may be freely composed with one
 * another as well as with version.
 *
 * JSOPTION_VAROBJFIX is recommended -- see the comments associated with the
 * prototypes for JS_ExecuteScript, JS_EvaluateScript, etc.
 */
#define JSOPTION_STRICT         JS_BIT(0)       /* warn on dubious practice */
#define JSOPTION_WERROR         JS_BIT(1)       /* convert warning to error */
#define JSOPTION_VAROBJFIX      JS_BIT(2)       /* make JS_EvaluateScript use
                                                   the last object on its 'obj'
                                                   param's scope chain as the
                                                   ECMA 'variables object' */
#define JSOPTION_PRIVATE_IS_NSISUPPORTS \
                                JS_BIT(3)       /* context private data points
                                                   to an nsISupports subclass */
#define JSOPTION_COMPILE_N_GO   JS_BIT(4)       /* caller of JS_Compile*Script
                                                   promises to execute compiled
                                                   script once only; enables
                                                   compile-time scope chain
                                                   resolution of consts. */
#define JSOPTION_ATLINE         JS_BIT(5)       /* //@line number ["filename"]
                                                   option supported for the
                                                   XUL preprocessor and kindred
                                                   beasts. */
#define JSOPTION_XML            JS_BIT(6)       /* EMCAScript for XML support:
                                                   parse <!-- --> as a token,
                                                   not backward compatible with
                                                   the comment-hiding hack used
                                                   in HTML script tags. */
#define JSOPTION_DONT_REPORT_UNCAUGHT \
                                JS_BIT(8)       /* When returning from the
                                                   outermost API call, prevent
                                                   uncaught exceptions from
                                                   being converted to error
                                                   reports */

#define JSOPTION_RELIMIT        JS_BIT(9)       /* Throw exception on any
                                                   regular expression which
                                                   backtracks more than n^3
                                                   times, where n is length
                                                   of the input string */
#define JSOPTION_ANONFUNFIX     JS_BIT(10)      /* Disallow function () {} in
                                                   statement context per
                                                   ECMA-262 Edition 3. */

#define JSOPTION_JIT            JS_BIT(11)      /* Enable JIT compilation. */

#define JSOPTION_NO_SCRIPT_RVAL JS_BIT(12)      /* A promise to the compiler
                                                   that a null rval out-param
                                                   will be passed to each call
                                                   to JS_ExecuteScript. */
#define JSOPTION_UNROOTED_GLOBAL JS_BIT(13)     /* The GC will not root the
                                                   contexts' global objects
                                                   (see JS_GetGlobalObject),
                                                   leaving that up to the
                                                   embedding. */

#define JSOPTION_METHODJIT      JS_BIT(14)      /* Whole-method JIT. */
#define JSOPTION_PROFILING      JS_BIT(15)      /* Profiler to make tracer/methodjit choices. */
#define JSOPTION_METHODJIT_ALWAYS \
                                JS_BIT(16)      /* Always whole-method JIT,
                                                   don't tune at run-time. */

/* Options which reflect compile-time properties of scripts. */
#define JSCOMPILEOPTION_MASK    (JSOPTION_XML | JSOPTION_ANONFUNFIX)

#define JSRUNOPTION_MASK        (JS_BITMASK(17) & ~JSCOMPILEOPTION_MASK)
#define JSALLOPTION_MASK        (JSCOMPILEOPTION_MASK | JSRUNOPTION_MASK)

extern JS_PUBLIC_API(uint32)
JS_GetOptions(JSContext *cx);

extern JS_PUBLIC_API(uint32)
JS_SetOptions(JSContext *cx, uint32 options);

extern JS_PUBLIC_API(uint32)
JS_ToggleOptions(JSContext *cx, uint32 options);

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

extern JS_PUBLIC_API(JSCompartmentCallback)
JS_SetCompartmentCallback(JSRuntime *rt, JSCompartmentCallback callback);

extern JS_PUBLIC_API(JSWrapObjectCallback)
JS_SetWrapObjectCallbacks(JSRuntime *rt,
                          JSWrapObjectCallback callback,
                          JSPreWrapCallback precallback);

extern JS_PUBLIC_API(JSCrossCompartmentCall *)
JS_EnterCrossCompartmentCall(JSContext *cx, JSObject *target);

extern JS_PUBLIC_API(JSCrossCompartmentCall *)
JS_EnterCrossCompartmentCallScript(JSContext *cx, JSScript *target);

extern JS_PUBLIC_API(void)
JS_LeaveCrossCompartmentCall(JSCrossCompartmentCall *call);

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

extern JS_PUBLIC_API(void *)
JS_GetCompartmentPrivate(JSContext *cx, JSCompartment *compartment);

extern JS_PUBLIC_API(JSBool)
JS_WrapObject(JSContext *cx, JSObject **objp);

extern JS_PUBLIC_API(JSBool)
JS_WrapValue(JSContext *cx, jsval *vp);

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

extern JS_FRIEND_API(JSObject *)
js_TransplantObjectWithWrapper(JSContext *cx,
                               JSObject *origobj,
                               JSObject *origwrapper,
                               JSObject *targetobj,
                               JSObject *targetwrapper);

extern JS_FRIEND_API(JSObject *)
js_TransplantObjectWithWrapper(JSContext *cx,
                               JSObject *origobj,
                               JSObject *origwrapper,
                               JSObject *targetobj,
                               JSObject *targetwrapper);

#ifdef __cplusplus
JS_END_EXTERN_C

class JS_PUBLIC_API(JSAutoEnterCompartment)
{
    JSCrossCompartmentCall *call;

  public:
    JSAutoEnterCompartment() : call(NULL) {}

    bool enter(JSContext *cx, JSObject *target);

    bool enter(JSContext *cx, JSScript *target);

    void enterAndIgnoreErrors(JSContext *cx, JSObject *target);

    bool entered() const { return call != NULL; }

    ~JSAutoEnterCompartment() {
        if (call && call != reinterpret_cast<JSCrossCompartmentCall*>(1))
            JS_LeaveCrossCompartmentCall(call);
    }

    void swap(JSAutoEnterCompartment &other) {
        JSCrossCompartmentCall *tmp = call;
        call = other.call;
        other.call = tmp;
    }
};

JS_BEGIN_EXTERN_C
#endif

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

extern JS_PUBLIC_API(void)
JS_SetGlobalObject(JSContext *cx, JSObject *obj);

/*
 * 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(JSBool)
JS_InitStandardClasses(JSContext *cx, 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 JSBool 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(JSBool)
JS_ResolveStandardClass(JSContext *cx, JSObject *obj, jsid id,
                        JSBool *resolved);

extern JS_PUBLIC_API(JSBool)
JS_EnumerateStandardClasses(JSContext *cx, JSObject *obj);

/*
 * Enumerate any already-resolved standard class ids into ida, or into a new
 * JSIdArray if ida is null.  Return the augmented array on success, null on
 * failure with ida (if it was non-null on entry) destroyed.
 */
extern JS_PUBLIC_API(JSIdArray *)
JS_EnumerateResolvedStandardClasses(JSContext *cx, JSObject *obj,
                                    JSIdArray *ida);

extern JS_PUBLIC_API(JSBool)
JS_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key,
                  JSObject **objp);

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

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

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

#ifdef JS_HAS_CTYPES
/*
 * Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'
 * object will be sealed.
 */
extern JS_PUBLIC_API(JSBool)
JS_InitCTypesClass(JSContext *cx, JSObject *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 jschar *source, size_t slen);

/*
 * Set of function pointers that ctypes can use for various internal functions.
 * See JS_SetCTypesCallbacks below. Providing NULL 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(JSBool)
JS_SetCTypesCallbacks(JSContext *cx, JSObject *ctypesObj, JSCTypesCallbacks *callbacks);
#endif

/*
 * Macros to hide interpreter stack layout details from a JSFastNative using
 * its jsval *vp parameter. The stack layout underlying invocation can't change
 * without breaking source and binary compatibility (argv[-2] is well-known to
 * be the callee jsval, and argv[-1] is as well known to be |this|).
 *
 * Note well: However, argv[-1] may be JSVAL_NULL where with slow natives it
 * is the global object, so embeddings implementing fast natives *must* call
 * JS_THIS or JS_THIS_OBJECT and test for failure indicated by a null return,
 * which should propagate as a false return from native functions and hooks.
 *
 * To reduce boilerplace checks, JS_InstanceOf and JS_GetInstancePrivate now
 * handle a null obj parameter by returning false (throwing a TypeError if
 * given non-null argv), so most native functions that type-check their |this|
 * parameter need not add null checking.
 *
 * NB: there is an anti-dependency between JS_CALLEE and JS_SET_RVAL: native
 * methods that may inspect their callee must defer setting their return value
 * until after any such possible inspection. Otherwise the return value will be
 * inspected instead of the callee function object.
 *
 * WARNING: These are not (yet) mandatory macros, but new code outside of the
 * engine should use them. In the Mozilla 2.0 milestone their definitions may
 * change incompatibly.
 *
 * N.B. constructors must not use JS_THIS, as no 'this' object has been created.
 */

#define JS_CALLEE(cx,vp)        ((vp)[0])
#define JS_THIS(cx,vp)          JS_ComputeThis(cx, vp)
#define JS_THIS_OBJECT(cx,vp)   (JSVAL_TO_OBJECT(JS_THIS(cx,vp)))
#define JS_ARGV(cx,vp)          ((vp) + 2)
#define JS_RVAL(cx,vp)          (*(vp))
#define JS_SET_RVAL(cx,vp,v)    (*(vp) = (v))

extern JS_PUBLIC_API(jsval)
JS_ComputeThis(JSContext *cx, jsval *vp);

#ifdef __cplusplus
#undef JS_THIS
static inline jsval
JS_THIS(JSContext *cx, jsval *vp)
{
    return JSVAL_IS_PRIMITIVE(vp[1]) ? JS_ComputeThis(cx, vp) : vp[1];
}
#endif

/*
 * |this| is passed to functions in ES5 without change.  Functions themselves
 * do any post-processing they desire to box |this|, compute the global object,
 * &c.  Use this macro to retrieve a function's unboxed |this| value.
 *
 * This macro must not be used in conjunction with JS_THIS or JS_THIS_OBJECT,
 * or vice versa.  Either use the provided this value with this macro, or
 * compute the boxed this value using those.
 *
 * N.B. constructors must not use JS_THIS_VALUE, as no 'this' object has been
 * created.
 */
#define JS_THIS_VALUE(cx,vp)    ((vp)[1])

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 nbytes);

extern JS_PUBLIC_API(void)
JS_free(JSContext *cx, 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);

extern JS_PUBLIC_API(JSBool)
JS_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);

/*
 * A GC root is a pointer to a jsval, JSObject * or JSString * that itself
 * points into the GC heap. JS_AddValueRoot takes a pointer to a jsval and
 * JS_AddGCThingRoot takes a pointer to a JSObject * or JString *.
 *
 * Note that, since JS_Add*Root stores the address of a variable (of type
 * jsval, JSString *, or JSObject *), that variable must live until
 * JS_Remove*Root is called to remove that variable. For example, after:
 *
 *   void some_function() {
 *     jsval v;
 *     JS_AddNamedRootedValue(cx, &v, "name");
 *
 * the caller must perform
 *
 *     JS_RemoveRootedValue(cx, &v);
 *
 * before some_function() returns.
 *
 * Also, use JS_AddNamed*Root(cx, &structPtr->memberObj, "structPtr->memberObj")
 * in preference to JS_Add*Root(cx, &structPtr->memberObj), in order to identify
 * roots by their source callsites.  This way, you can find the callsite while
 * debugging if you should fail to do JS_Remove*Root(cx, &structPtr->memberObj)
 * before freeing structPtr's memory.
 */
extern JS_PUBLIC_API(JSBool)
JS_AddValueRoot(JSContext *cx, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_AddStringRoot(JSContext *cx, JSString **rp);

extern JS_PUBLIC_API(JSBool)
JS_AddObjectRoot(JSContext *cx, JSObject **rp);

extern JS_PUBLIC_API(JSBool)
JS_AddGCThingRoot(JSContext *cx, void **rp);

#ifdef NAME_ALL_GC_ROOTS
#define JS_DEFINE_TO_TOKEN(def) #def
#define JS_DEFINE_TO_STRING(def) JS_DEFINE_TO_TOKEN(def)
#define JS_AddValueRoot(cx,vp) JS_AddNamedValueRoot((cx), (vp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddStringRoot(cx,rp) JS_AddNamedStringRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddObjectRoot(cx,rp) JS_AddNamedObjectRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#define JS_AddGCThingRoot(cx,rp) JS_AddNamedGCThingRoot((cx), (rp), (__FILE__ ":" JS_TOKEN_TO_STRING(__LINE__))
#endif

extern JS_PUBLIC_API(JSBool)
JS_AddNamedValueRoot(JSContext *cx, jsval *vp, const char *name);

extern JS_PUBLIC_API(JSBool)
JS_AddNamedStringRoot(JSContext *cx, JSString **rp, const char *name);

extern JS_PUBLIC_API(JSBool)
JS_AddNamedObjectRoot(JSContext *cx, JSObject **rp, const char *name);

extern JS_PUBLIC_API(JSBool)
JS_AddNamedGCThingRoot(JSContext *cx, void **rp, const char *name);

extern JS_PUBLIC_API(JSBool)
JS_RemoveValueRoot(JSContext *cx, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_RemoveStringRoot(JSContext *cx, JSString **rp);

extern JS_PUBLIC_API(JSBool)
JS_RemoveObjectRoot(JSContext *cx, JSObject **rp);

extern JS_PUBLIC_API(JSBool)
JS_RemoveGCThingRoot(JSContext *cx, void **rp);

/* TODO: remove these APIs */

extern JS_FRIEND_API(JSBool)
js_AddRootRT(JSRuntime *rt, jsval *vp, const char *name);

extern JS_FRIEND_API(JSBool)
js_AddGCThingRootRT(JSRuntime *rt, void **rp, const char *name);

extern JS_FRIEND_API(JSBool)
js_RemoveRoot(JSRuntime *rt, void *rp);

#ifdef __cplusplus
JS_END_EXTERN_C

namespace JS {

/*
 * Protecting non-jsval, non-JSObject *, non-JSString * values from collection
 *
 * Most of the time, the garbage collector's conservative stack scanner works
 * behind the scenes, finding all live values and protecting them from being
 * collected. However, when JSAPI client code obtains a pointer to data the
 * scanner does not know about, owned by an object the scanner does know about,
 * Care Must Be Taken.
 *
 * The scanner recognizes only a select set of types: pointers to JSObjects and
 * similar things (JSFunctions, and so on), pointers to JSStrings, and jsvals.
 * So while the scanner finds all live |JSString| pointers, it does not notice
 * |jschar| pointers.
 *
 * So suppose we have:
 *
 *   void f(JSString *str) {
 *     const jschar *ch = JS_GetStringCharsZ(str);
 *     ... do stuff with ch, but no uses of str ...;
 *   }
 *
 * After the call to |JS_GetStringCharsZ|, there are no further uses of
 * |str|, which means that the compiler is within its rights to not store
 * it anywhere. But because the stack scanner will not notice |ch|, there
 * is no longer any live value in this frame that would keep the string
 * alive. If |str| is the last reference to that |JSString|, and the
 * collector runs while we are using |ch|, the string's array of |jschar|s
 * may be freed out from under us.
 *
 * Note that there is only an issue when 1) we extract a thing X the scanner
 * doesn't recognize from 2) a thing Y the scanner does recognize, and 3) if Y
 * gets garbage-collected, then X gets freed. If we have code like this:
 *
 *   void g(JSObject *obj) {
 *     jsval x;
 *     JS_GetProperty(obj, "x", &x);
 *     ... do stuff with x ...
 *   }
 *
 * there's no problem, because the value we've extracted, x, is a jsval, a
 * type that the conservative scanner recognizes.
 *
 * Conservative GC frees us from the obligation to explicitly root the types it
 * knows about, but when we work with derived values like |ch|, we must root
 * their owners, as the derived value alone won't keep them alive.
 *
 * A JS::Anchor is a kind of GC root that allows us to keep the owners of
 * derived values like |ch| alive throughout the Anchor's lifetime. We could
 * fix the above code as follows:
 *
 *   void f(JSString *str) {
 *     JS::Anchor<JSString *> a_str(str);
 *     const jschar *ch = JS_GetStringCharsZ(str);
 *     ... do stuff with ch, but no uses of str ...;
 *   }
 *
 * This simply ensures that |str| will be live until |a_str| goes out of scope.
 * As long as we don't retain a pointer to the string's characters for longer
 * than that, we have avoided all garbage collection hazards.
 */
template<typename T> class AnchorPermitted;
template<> class AnchorPermitted<JSObject *> { };
template<> class AnchorPermitted<const JSObject *> { };
template<> class AnchorPermitted<JSFunction *> { };
template<> class AnchorPermitted<const JSFunction *> { };
template<> class AnchorPermitted<JSString *> { };
template<> class AnchorPermitted<const JSString *> { };
template<> class AnchorPermitted<jsval> { };

template<typename T>
class Anchor: AnchorPermitted<T> {
  public:
    Anchor() { }
    explicit Anchor(T t) { hold = t; }
    inline ~Anchor();
    T &get() { return hold; }
    void set(const T &t) { hold = t; }
    void clear() { hold = 0; }
  private:
    T hold;
    /* Anchors should not be assigned or passed to functions. */
    Anchor(const Anchor &);
    const Anchor &operator=(const Anchor &);
};

#ifdef __GNUC__
template<typename T>
inline Anchor<T>::~Anchor() {
    /*
     * No code is generated for this. But because this is marked 'volatile', G++ will
     * assume it has important side-effects, and won't delete it. (G++ never looks at
     * the actual text and notices it's empty.) And because we have passed |hold| to
     * it, GCC will keep |hold| alive until this point.
     *
     * The "memory" clobber operand ensures that G++ will not move prior memory
     * accesses after the asm --- it's a barrier. Unfortunately, it also means that
     * G++ will assume that all memory has changed after the asm, as it would for a
     * call to an unknown function. I don't know of a way to avoid that consequence.
     */
    asm volatile("":: "g" (hold) : "memory");
}
#else
template<typename T>
inline Anchor<T>::~Anchor() {
    /*
     * An adequate portable substitute, for non-structure types.
     *
     * The compiler promises that, by the end of an expression statement, the
     * last-stored value to a volatile object is the same as it would be in an
     * unoptimized, direct implementation (the "abstract machine" whose behavior the
     * language spec describes). However, the compiler is still free to reorder
     * non-volatile accesses across this store --- which is what we must prevent. So
     * assigning the held value to a volatile variable, as we do here, is not enough.
     *
     * In our case, however, garbage collection only occurs at function calls, so it
     * is sufficient to ensure that the destructor's store isn't moved earlier across
     * any function calls that could collect. It is hard to imagine the compiler
     * analyzing the program so thoroughly that it could prove that such motion was
     * safe. In practice, compilers treat calls to the collector as opaque operations
     * --- in particular, as operations which could access volatile variables, across
     * which this destructor must not be moved.
     *
     * ("Objection, your honor!  *Alleged* killer whale!")
     *
     * The disadvantage of this approach is that it does generate code for the store.
     * We do need to use Anchors in some cases where cycles are tight.
     */
    volatile T sink;
    sink = hold;
}

#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
/*
 * The default assignment operator for |struct C| has the signature:
 *
 *   C& C::operator=(const C&)
 *
 * And in particular requires implicit conversion of |this| to type |C| for the return
 * value. But |volatile C| cannot thus be converted to |C|, so just doing |sink = hold| as
 * in the non-specialized version would fail to compile. Do the assignment on asBits
 * instead, since I don't think we want to give jsval_layout an assignment operator
 * returning |volatile jsval_layout|.
 */
template<>
inline Anchor<jsval>::~Anchor() {
    volatile jsval sink;
    sink.asBits = hold.asBits;
}
#endif
#endif

}  /* namespace JS */

JS_BEGIN_EXTERN_C
#endif

/*
 * This symbol may be used by embedders to detect the change from the old
 * JS_AddRoot(JSContext *, void *) APIs to the new ones above.
 */
#define JS_TYPED_ROOTING_API

/* Obsolete rooting APIs. */
#define JS_ClearNewbornRoots(cx) ((void) 0)
#define JS_EnterLocalRootScope(cx) (JS_TRUE)
#define JS_LeaveLocalRootScope(cx) ((void) 0)
#define JS_LeaveLocalRootScopeWithResult(cx, rval) ((void) 0)
#define JS_ForgetLocalRoot(cx, thing) ((void) 0)

typedef enum JSGCRootType {
    JS_GC_ROOT_VALUE_PTR,
    JS_GC_ROOT_GCTHING_PTR
} JSGCRootType;

#ifdef DEBUG
extern JS_PUBLIC_API(void)
JS_DumpNamedRoots(JSRuntime *rt,
                  void (*dump)(const char *name, void *rp, JSGCRootType type, void *data),
                  void *data);
#endif

/*
 * Call JS_MapGCRoots to map the GC's roots table using map(rp, name, data).
 * The root is pointed at by rp; if the root is unnamed, name is null; data is
 * supplied from the third parameter to JS_MapGCRoots.
 *
 * The map function should return JS_MAP_GCROOT_REMOVE to cause the currently
 * enumerated root to be removed.  To stop enumeration, set JS_MAP_GCROOT_STOP
 * in the return value.  To keep on mapping, return JS_MAP_GCROOT_NEXT.  These
 * constants are flags; you can OR them together.
 *
 * This function acquires and releases rt's GC lock around the mapping of the
 * roots table, so the map function should run to completion in as few cycles
 * as possible.  Of course, map cannot call JS_GC, JS_MaybeGC, JS_BeginRequest,
 * or any JS API entry point that acquires locks, without double-tripping or
 * deadlocking on the GC lock.
 *
 * The JSGCRootType parameter indicates whether rp is a pointer to a Value
 * (which is obtained by '(Value *)rp') or a pointer to a GC-thing pointer
 * (which is obtained by '(void **)rp').
 *
 * JS_MapGCRoots returns the count of roots that were successfully mapped.
 */
#define JS_MAP_GCROOT_NEXT      0       /* continue mapping entries */
#define JS_MAP_GCROOT_STOP      1       /* stop mapping entries */
#define JS_MAP_GCROOT_REMOVE    2       /* remove and free the current entry */

typedef intN
(* JSGCRootMapFun)(void *rp, JSGCRootType type, const char *name, void *data);

extern JS_PUBLIC_API(uint32)
JS_MapGCRoots(JSRuntime *rt, JSGCRootMapFun map, void *data);

extern JS_PUBLIC_API(JSBool)
JS_LockGCThing(JSContext *cx, void *thing);

extern JS_PUBLIC_API(JSBool)
JS_LockGCThingRT(JSRuntime *rt, void *thing);

extern JS_PUBLIC_API(JSBool)
JS_UnlockGCThing(JSContext *cx, void *thing);

extern JS_PUBLIC_API(JSBool)
JS_UnlockGCThingRT(JSRuntime *rt, void *thing);

/*
 * Register externally maintained GC roots.
 *
 * traceOp: the trace operation. For each root the implementation should call
 *          JS_CallTracer whenever the root contains a traceable thing.
 * data:    the data argument to pass to each invocation of traceOp.
 */
extern JS_PUBLIC_API(void)
JS_SetExtraGCRoots(JSRuntime *rt, JSTraceDataOp traceOp, void *data);

/*
 * For implementors of JSMarkOp. All new code should implement JSTraceOp
 * instead.
 */
extern JS_PUBLIC_API(void)
JS_MarkGCThing(JSContext *cx, jsval v, const char *name, void *arg);

/*
 * JS_CallTracer API and related macros for implementors of JSTraceOp, to
 * enumerate all references to traceable things reachable via a property or
 * other strong ref identified for debugging purposes by name or index or
 * a naming callback.
 *
 * By definition references to traceable things include non-null pointers
 * to JSObject, JSString and jsdouble and corresponding jsvals.
 *
 * See the JSTraceOp typedef in jspubtd.h.
 */

/* Trace kinds to pass to JS_Tracing. */
#define JSTRACE_OBJECT  0
#define JSTRACE_STRING  1

/*
 * Use the following macros to check if a particular jsval is a traceable
 * thing and to extract the thing and its kind to pass to JS_CallTracer.
 */
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE(jsval v)
{
    jsval_layout l;
    l.asBits = JSVAL_BITS(v);
    return JSVAL_IS_TRACEABLE_IMPL(l);
}

static JS_ALWAYS_INLINE void *
JSVAL_TO_TRACEABLE(jsval v)
{
    return JSVAL_TO_GCTHING(v);
}

static JS_ALWAYS_INLINE uint32
JSVAL_TRACE_KIND(jsval v)
{
    jsval_layout l;
    JS_ASSERT(JSVAL_IS_GCTHING(v));
    l.asBits = JSVAL_BITS(v);
    return JSVAL_TRACE_KIND_IMPL(l);
}

struct JSTracer {
    JSContext           *context;
    JSTraceCallback     callback;
    JSTraceNamePrinter  debugPrinter;
    const void          *debugPrintArg;
    size_t              debugPrintIndex;
};

/*
 * The method to call on each reference to a traceable thing stored in a
 * particular JSObject or other runtime structure. With DEBUG defined the
 * caller before calling JS_CallTracer must initialize JSTracer fields
 * describing the reference using the macros below.
 */
extern JS_PUBLIC_API(void)
JS_CallTracer(JSTracer *trc, void *thing, uint32 kind);

/*
 * Set debugging information about a reference to a traceable thing to prepare
 * for the following call to JS_CallTracer.
 *
 * When printer is null, arg must be const char * or char * C string naming
 * the reference and index must be either (size_t)-1 indicating that the name
 * alone describes the reference or it must be an index into some array vector
 * that stores the reference.
 *
 * When printer callback is not null, the arg and index arguments are
 * available to the callback as debugPrinterArg and debugPrintIndex fields
 * of JSTracer.
 *
 * The storage for name or callback's arguments needs to live only until
 * the following call to JS_CallTracer returns.
 */
#ifdef DEBUG
# define JS_SET_TRACING_DETAILS(trc, printer, arg, index)                     \
    JS_BEGIN_MACRO                                                            \
        (trc)->debugPrinter = (printer);                                      \
        (trc)->debugPrintArg = (arg);                                         \
        (trc)->debugPrintIndex = (index);                                     \
    JS_END_MACRO
#else
# define JS_SET_TRACING_DETAILS(trc, printer, arg, index)                     \
    JS_BEGIN_MACRO                                                            \
    JS_END_MACRO
#endif

/*
 * Convenience macro to describe the argument of JS_CallTracer using C string
 * and index.
 */
# define JS_SET_TRACING_INDEX(trc, name, index)                               \
    JS_SET_TRACING_DETAILS(trc, NULL, name, index)

/*
 * Convenience macro to describe the argument of JS_CallTracer using C string.
 */
# define JS_SET_TRACING_NAME(trc, name)                                       \
    JS_SET_TRACING_DETAILS(trc, NULL, name, (size_t)-1)

/*
 * Convenience macro to invoke JS_CallTracer using C string as the name for
 * the reference to a traceable thing.
 */
# define JS_CALL_TRACER(trc, thing, kind, name)                               \
    JS_BEGIN_MACRO                                                            \
        JS_SET_TRACING_NAME(trc, name);                                       \
        JS_CallTracer((trc), (thing), (kind));                                \
    JS_END_MACRO

/*
 * Convenience macros to invoke JS_CallTracer when jsval represents a
 * reference to a traceable thing.
 */
#define JS_CALL_VALUE_TRACER(trc, val, name)                                  \
    JS_BEGIN_MACRO                                                            \
        if (JSVAL_IS_TRACEABLE(val)) {                                        \
            JS_CALL_TRACER((trc), JSVAL_TO_GCTHING(val),                      \
                           JSVAL_TRACE_KIND(val), name);                      \
        }                                                                     \
    JS_END_MACRO

#define JS_CALL_OBJECT_TRACER(trc, object, name)                              \
    JS_BEGIN_MACRO                                                            \
        JSObject *obj_ = (object);                                            \
        JS_ASSERT(obj_);                                                      \
        JS_CALL_TRACER((trc), obj_, JSTRACE_OBJECT, name);                    \
    JS_END_MACRO

#define JS_CALL_STRING_TRACER(trc, string, name)                              \
    JS_BEGIN_MACRO                                                            \
        JSString *str_ = (string);                                            \
        JS_ASSERT(str_);                                                      \
        JS_CALL_TRACER((trc), str_, JSTRACE_STRING, name);                    \
    JS_END_MACRO

/*
 * API for JSTraceCallback implementations.
 */
# define JS_TRACER_INIT(trc, cx_, callback_)                                  \
    JS_BEGIN_MACRO                                                            \
        (trc)->context = (cx_);                                               \
        (trc)->callback = (callback_);                                        \
        (trc)->debugPrinter = NULL;                                           \
        (trc)->debugPrintArg = NULL;                                          \
        (trc)->debugPrintIndex = (size_t)-1;                                  \
    JS_END_MACRO

extern JS_PUBLIC_API(void)
JS_TraceChildren(JSTracer *trc, void *thing, uint32 kind);

extern JS_PUBLIC_API(void)
JS_TraceRuntime(JSTracer *trc);

#ifdef DEBUG

extern JS_PUBLIC_API(void)
JS_PrintTraceThingInfo(char *buf, size_t bufsize, JSTracer *trc,
                       void *thing, uint32 kind, JSBool includeDetails);

/*
 * DEBUG-only method to dump the object graph of heap-allocated things.
 *
 * fp:              file for the dump output.
 * start:           when non-null, dump only things reachable from start
 *                  thing. Otherwise dump all things reachable from the
 *                  runtime roots.
 * startKind:       trace kind of start if start is not null. Must be 0 when
 *                  start is null.
 * thingToFind:     dump only paths in the object graph leading to thingToFind
 *                  when non-null.
 * maxDepth:        the upper bound on the number of edges to descend from the
 *                  graph roots.
 * thingToIgnore:   thing to ignore during the graph traversal when non-null.
 */
extern JS_PUBLIC_API(JSBool)
JS_DumpHeap(JSContext *cx, FILE *fp, void* startThing, uint32 startKind,
            void *thingToFind, size_t maxDepth, void *thingToIgnore);

#endif

/*
 * 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(JSGCCallback)
JS_SetGCCallback(JSContext *cx, JSGCCallback cb);

extern JS_PUBLIC_API(JSGCCallback)
JS_SetGCCallbackRT(JSRuntime *rt, JSGCCallback cb);

extern JS_PUBLIC_API(JSBool)
JS_IsGCMarkingTracer(JSTracer *trc);

extern JS_PUBLIC_API(JSBool)
JS_IsAboutToBeFinalized(JSContext *cx, void *thing);

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,

    /* Hoard stackPools for this long, in ms, default is 30 seconds. */
    JSGC_STACKPOOL_LIFESPAN = 2,

    /*
     * The factor that defines when the GC is invoked. The factor is a
     * percent of the memory allocated by the GC after the last run of
     * the GC. When the current memory allocated by the GC is more than
     * this percent then the GC is invoked. The factor cannot be less
     * than 100 since the current memory allocated by the GC cannot be less
     * than the memory allocated after the last run of the GC.
     */
    JSGC_TRIGGER_FACTOR = 3,

    /* Amount of bytes allocated by the GC. */
    JSGC_BYTES = 4,

    /* Number of times when GC was invoked. */
    JSGC_NUMBER = 5,

    /* Max size of the code cache in bytes. */
    JSGC_MAX_CODE_CACHE_BYTES = 6,

    /* Select GC mode. */
    JSGC_MODE = 7,

    /* Number of GC chunks waiting to expire. */
    JSGC_UNUSED_CHUNKS = 8
} JSGCParamKey;

typedef enum JSGCMode {
    /* Perform only global GCs. */
    JSGC_MODE_GLOBAL = 0,

    /* Perform per-compartment GCs until too much garbage has accumulated. */
    JSGC_MODE_COMPARTMENT = 1
} JSGCMode;

extern JS_PUBLIC_API(void)
JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32 value);

extern JS_PUBLIC_API(uint32)
JS_GetGCParameter(JSRuntime *rt, JSGCParamKey key);

extern JS_PUBLIC_API(void)
JS_SetGCParameterForThread(JSContext *cx, JSGCParamKey key, uint32 value);

extern JS_PUBLIC_API(uint32)
JS_GetGCParameterForThread(JSContext *cx, JSGCParamKey key);

/*
 * Flush the code cache for the current thread. The operation might be
 * delayed if the cache cannot be flushed currently because native
 * code is currently executing.
 */

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

/*
 * Add a finalizer for external strings created by JS_NewExternalString (see
 * below) using a type-code returned from this function, and that understands
 * how to free or release the memory pointed at by JS_GetStringChars(str).
 *
 * Return a nonnegative type index if there is room for finalizer in the
 * global GC finalizers table, else return -1.  If the engine is compiled
 * JS_THREADSAFE and used in a multi-threaded environment, this function must
 * be invoked on the primordial thread only, at startup -- or else the entire
 * program must single-thread itself while loading a module that calls this
 * function.
 */
extern JS_PUBLIC_API(intN)
JS_AddExternalStringFinalizer(JSStringFinalizeOp finalizer);

/*
 * Remove finalizer from the global GC finalizers table, returning its type
 * code if found, -1 if not found.
 *
 * As with JS_AddExternalStringFinalizer, there is a threading restriction
 * if you compile the engine JS_THREADSAFE: this function may be called for a
 * given finalizer pointer on only one thread; different threads may call to
 * remove distinct finalizers safely.
 *
 * You must ensure that all strings with finalizer's type have been collected
 * before calling this function.  Otherwise, string data will be leaked by the
 * GC, for want of a finalizer to call.
 */
extern JS_PUBLIC_API(intN)
JS_RemoveExternalStringFinalizer(JSStringFinalizeOp finalizer);

/*
 * Create a new JSString whose chars member refers to external memory, i.e.,
 * memory requiring spe, type-specific finalization.  The type code must
 * be a nonnegative return value from JS_AddExternalStringFinalizer.
 */
extern JS_PUBLIC_API(JSString *)
JS_NewExternalString(JSContext *cx, jschar *chars, size_t length, intN type);

/*
 * Returns the external-string finalizer index for this string, or -1 if it is
 * an "internal" (native to JS engine) string.
 */
extern JS_PUBLIC_API(intN)
JS_GetExternalStringGCType(JSRuntime *rt, JSString *str);

/*
 * Deprecated. Use JS_SetNativeStackQuoata instead.
 */
extern JS_PUBLIC_API(void)
JS_SetThreadStackLimit(JSContext *cx, jsuword limitAddr);

/*
 * Set the size of the native stack that should not be exceed. To disable
 * stack size checking pass 0.
 */
extern JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSContext *cx, size_t stackSize);


/*
 * Set the quota on the number of bytes that stack-like data structures can
 * use when the runtime compiles and executes scripts. These structures
 * consume heap space, so JS_SetThreadStackLimit does not bound their size.
 * The default quota is 128MB which is very generous.
 *
 * The function must be called before any script compilation or execution API
 * calls, i.e. either immediately after JS_NewContext or from JSCONTEXT_NEW
 * context callback.
 */
extern JS_PUBLIC_API(void)
JS_SetScriptStackQuota(JSContext *cx, size_t quota);

#define JS_DEFAULT_SCRIPT_STACK_QUOTA   ((size_t) 0x8000000)

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

/*
 * Classes, objects, and properties.
 */
typedef void (*JSClassInternal)();

/* For detailed comments on the function pointer types, see jspubtd.h. */
struct JSClass {
    const char          *name;
    uint32              flags;

    /* Mandatory non-null function pointer members. */
    JSPropertyOp        addProperty;
    JSPropertyOp        delProperty;
    JSPropertyOp        getProperty;
    JSStrictPropertyOp  setProperty;
    JSEnumerateOp       enumerate;
    JSResolveOp         resolve;
    JSConvertOp         convert;
    JSFinalizeOp        finalize;

    /* Optionally non-null members start here. */
    JSClassInternal     reserved0;
    JSCheckAccessOp     checkAccess;
    JSNative            call;
    JSNative            construct;
    JSXDRObjectOp       xdrObject;
    JSHasInstanceOp     hasInstance;
    JSMarkOp            mark;

    JSClassInternal     reserved1;
    void                *reserved[19];
};

#define JSCLASS_HAS_PRIVATE             (1<<0)  /* objects have private slot */
#define JSCLASS_NEW_ENUMERATE           (1<<1)  /* has JSNewEnumerateOp hook */
#define JSCLASS_NEW_RESOLVE             (1<<2)  /* has JSNewResolveOp hook */
#define JSCLASS_PRIVATE_IS_NSISUPPORTS  (1<<3)  /* private is (nsISupports *) */
#define JSCLASS_NEW_RESOLVE_GETS_START  (1<<5)  /* JSNewResolveOp gets starting
                                                   object in prototype chain
                                                   passed in via *objp in/out
                                                   parameter */
#define JSCLASS_CONSTRUCT_PROTOTYPE     (1<<6)  /* call constructor on class
                                                   prototype */
#define JSCLASS_DOCUMENT_OBSERVER       (1<<7)  /* DOM document observer */

/*
 * To reserve slots fetched and stored via JS_Get/SetReservedSlot, bitwise-or
 * JSCLASS_HAS_RESERVED_SLOTS(n) into the initializer for JSClass.flags, where
 * n is a constant in [1, 255].  Reserved slots are indexed from 0 to n-1.
 */
#define JSCLASS_RESERVED_SLOTS_SHIFT    8       /* room for 8 flags below */
#define JSCLASS_RESERVED_SLOTS_WIDTH    8       /* and 16 above this field */
#define JSCLASS_RESERVED_SLOTS_MASK     JS_BITMASK(JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_HAS_RESERVED_SLOTS(n)   (((n) & JSCLASS_RESERVED_SLOTS_MASK)  \
                                         << JSCLASS_RESERVED_SLOTS_SHIFT)
#define JSCLASS_RESERVED_SLOTS(clasp)   (((clasp)->flags                      \
                                          >> JSCLASS_RESERVED_SLOTS_SHIFT)    \
                                         & JSCLASS_RESERVED_SLOTS_MASK)

#define JSCLASS_HIGH_FLAGS_SHIFT        (JSCLASS_RESERVED_SLOTS_SHIFT +       \
                                         JSCLASS_RESERVED_SLOTS_WIDTH)

#define JSCLASS_INTERNAL_FLAG1          (1<<(JSCLASS_HIGH_FLAGS_SHIFT+0))
#define JSCLASS_IS_ANONYMOUS            (1<<(JSCLASS_HIGH_FLAGS_SHIFT+1))
#define JSCLASS_IS_GLOBAL               (1<<(JSCLASS_HIGH_FLAGS_SHIFT+2))

/* Indicates that JSClass.mark is a tracer with JSTraceOp type. */
#define JSCLASS_MARK_IS_TRACE           (1<<(JSCLASS_HIGH_FLAGS_SHIFT+3))
#define JSCLASS_INTERNAL_FLAG2          (1<<(JSCLASS_HIGH_FLAGS_SHIFT+4))

/* Indicate whether the proto or ctor should be frozen. */
#define JSCLASS_FREEZE_PROTO            (1<<(JSCLASS_HIGH_FLAGS_SHIFT+5))
#define JSCLASS_FREEZE_CTOR             (1<<(JSCLASS_HIGH_FLAGS_SHIFT+6))

/* Additional global reserved slots, beyond those for standard prototypes. */
#define JSRESERVED_GLOBAL_SLOTS_COUNT     6
#define JSRESERVED_GLOBAL_THIS            (JSProto_LIMIT * 3)
#define JSRESERVED_GLOBAL_THROWTYPEERROR  (JSRESERVED_GLOBAL_THIS + 1)
#define JSRESERVED_GLOBAL_REGEXP_STATICS  (JSRESERVED_GLOBAL_THROWTYPEERROR + 1)
#define JSRESERVED_GLOBAL_FUNCTION_NS     (JSRESERVED_GLOBAL_REGEXP_STATICS + 1)
#define JSRESERVED_GLOBAL_EVAL_ALLOWED    (JSRESERVED_GLOBAL_FUNCTION_NS + 1)
#define JSRESERVED_GLOBAL_FLAGS           (JSRESERVED_GLOBAL_EVAL_ALLOWED + 1)

/* Global flags. */
#define JSGLOBAL_FLAGS_CLEARED          0x1

/*
 * ECMA-262 requires that most constructors used internally create objects
 * with "the original Foo.prototype value" as their [[Prototype]] (__proto__)
 * member initial value.  The "original ... value" verbiage is there because
 * in ECMA-262, global properties naming class objects are read/write and
 * deleteable, for the most part.
 *
 * Implementing this efficiently requires that global objects have classes
 * with the following flags. Failure to use JSCLASS_GLOBAL_FLAGS was
 * prevously allowed, but is now an ES5 violation and thus unsupported.
 */
#define JSCLASS_GLOBAL_FLAGS                                                  \
    (JSCLASS_IS_GLOBAL |                                                      \
     JSCLASS_HAS_RESERVED_SLOTS(JSRESERVED_GLOBAL_THIS + JSRESERVED_GLOBAL_SLOTS_COUNT))

/* Fast access to the original value of each standard class's prototype. */
#define JSCLASS_CACHED_PROTO_SHIFT      (JSCLASS_HIGH_FLAGS_SHIFT + 8)
#define JSCLASS_CACHED_PROTO_WIDTH      8
#define JSCLASS_CACHED_PROTO_MASK       JS_BITMASK(JSCLASS_CACHED_PROTO_WIDTH)
#define JSCLASS_HAS_CACHED_PROTO(key)   ((key) << JSCLASS_CACHED_PROTO_SHIFT)
#define JSCLASS_CACHED_PROTO_KEY(clasp) ((JSProtoKey)                         \
                                         (((clasp)->flags                     \
                                           >> JSCLASS_CACHED_PROTO_SHIFT)     \
                                          & JSCLASS_CACHED_PROTO_MASK))

/* Initializer for unused members of statically initialized JSClass structs. */
#define JSCLASS_NO_INTERNAL_MEMBERS     0,{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
#define JSCLASS_NO_OPTIONAL_MEMBERS     0,0,0,0,0,0,0,JSCLASS_NO_INTERNAL_MEMBERS

struct JSIdArray {
    jsint length;
    jsid  vector[1];    /* actually, length jsid words */
};

extern JS_PUBLIC_API(void)
JS_DestroyIdArray(JSContext *cx, JSIdArray *ida);

extern JS_PUBLIC_API(JSBool)
JS_ValueToId(JSContext *cx, jsval v, jsid *idp);

extern JS_PUBLIC_API(JSBool)
JS_IdToValue(JSContext *cx, jsid id, jsval *vp);

/*
 * JSNewResolveOp flag bits.
 */
#define JSRESOLVE_QUALIFIED     0x01    /* resolve a qualified property id */
#define JSRESOLVE_ASSIGNING     0x02    /* resolve on the left of assignment */
#define JSRESOLVE_DETECTING     0x04    /* 'if (o.p)...' or '(o.p) ?...:...' */
#define JSRESOLVE_DECLARING     0x08    /* var, const, or function prolog op */
#define JSRESOLVE_CLASSNAME     0x10    /* class name used when constructing */
#define JSRESOLVE_WITH          0x20    /* resolve inside a with statement */

extern JS_PUBLIC_API(JSBool)
JS_PropertyStub(JSContext *cx, JSObject *obj, jsid id, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_StrictPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_EnumerateStub(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSBool)
JS_ResolveStub(JSContext *cx, JSObject *obj, jsid id);

extern JS_PUBLIC_API(JSBool)
JS_ConvertStub(JSContext *cx, JSObject *obj, JSType type, jsval *vp);

extern JS_PUBLIC_API(void)
JS_FinalizeStub(JSContext *cx, JSObject *obj);

struct JSConstDoubleSpec {
    jsdouble        dval;
    const char      *name;
    uint8           flags;
    uint8           spare[3];
};

/*
 * To define an array element rather than a named property member, cast the
 * element's index to (const char *) and initialize name with it, and set the
 * JSPROP_INDEX bit in flags.
 */
struct JSPropertySpec {
    const char            *name;
    int8                  tinyid;
    uint8                 flags;
    JSPropertyOp          getter;
    JSStrictPropertyOp    setter;
};

struct JSFunctionSpec {
    const char      *name;
    JSNative        call;
    uint16          nargs;
    uint16          flags;
};

/*
 * 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(NULL,NULL,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.
 */
#define JS_FS(name,call,nargs,flags)                                          \
    {name, call, nargs, flags}
#define JS_FN(name,call,nargs,flags)                                          \
    {name, call, nargs, (flags) | JSFUN_STUB_GSOPS}

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

#ifdef JS_THREADSAFE
extern JS_PUBLIC_API(JSClass *)
JS_GetClass(JSContext *cx, JSObject *obj);

#define JS_GET_CLASS(cx,obj) JS_GetClass(cx, obj)
#else
extern JS_PUBLIC_API(JSClass *)
JS_GetClass(JSObject *obj);

#define JS_GET_CLASS(cx,obj) JS_GetClass(obj)
#endif

extern JS_PUBLIC_API(JSBool)
JS_InstanceOf(JSContext *cx, JSObject *obj, JSClass *clasp, jsval *argv);

extern JS_PUBLIC_API(JSBool)
JS_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);

extern JS_PUBLIC_API(void *)
JS_GetPrivate(JSContext *cx, JSObject *obj);

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

extern JS_PUBLIC_API(void *)
JS_GetInstancePrivate(JSContext *cx, JSObject *obj, JSClass *clasp,
                      jsval *argv);

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

extern JS_PUBLIC_API(JSBool)
JS_SetPrototype(JSContext *cx, JSObject *obj, JSObject *proto);

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

extern JS_PUBLIC_API(JSBool)
JS_SetParent(JSContext *cx, JSObject *obj, JSObject *parent);

extern JS_PUBLIC_API(JSObject *)
JS_GetConstructor(JSContext *cx, JSObject *proto);

/*
 * Get a unique identifier for obj, good for the lifetime of obj (even if it
 * is moved by a copying GC).  Return false on failure (likely out of memory),
 * and true with *idp containing the unique id on success.
 */
extern JS_PUBLIC_API(JSBool)
JS_GetObjectId(JSContext *cx, JSObject *obj, jsid *idp);

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

extern JS_PUBLIC_API(JSObject *)
JS_NewCompartmentAndGlobalObject(JSContext *cx, JSClass *clasp, JSPrincipals *principals);

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

/* Queries the [[Extensible]] property of the object. */
extern JS_PUBLIC_API(JSBool)
JS_IsExtensible(JSObject *obj);

/*
 * Unlike JS_NewObject, JS_NewObjectWithGivenProto does not compute a default
 * proto if proto's actual parameter value is null.
 */
extern JS_PUBLIC_API(JSObject *)
JS_NewObjectWithGivenProto(JSContext *cx, JSClass *clasp, JSObject *proto,
                           JSObject *parent);

/*
 * 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(JSBool)
JS_DeepFreezeObject(JSContext *cx, JSObject *obj);

/*
 * Freezes an object; see ES5's Object.freeze(obj) method.
 */
extern JS_PUBLIC_API(JSBool)
JS_FreezeObject(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSObject *)
JS_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
                   JSObject *parent);

extern JS_PUBLIC_API(JSObject *)
JS_ConstructObjectWithArguments(JSContext *cx, JSClass *clasp, JSObject *proto,
                                JSObject *parent, uintN argc, jsval *argv);

extern JS_PUBLIC_API(JSObject *)
JS_New(JSContext *cx, JSObject *ctor, uintN argc, jsval *argv);

extern JS_PUBLIC_API(JSObject *)
JS_DefineObject(JSContext *cx, JSObject *obj, const char *name, JSClass *clasp,
                JSObject *proto, uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_DefineConstDoubles(JSContext *cx, JSObject *obj, JSConstDoubleSpec *cds);

extern JS_PUBLIC_API(JSBool)
JS_DefineProperties(JSContext *cx, JSObject *obj, JSPropertySpec *ps);

extern JS_PUBLIC_API(JSBool)
JS_DefineProperty(JSContext *cx, JSObject *obj, const char *name, jsval value,
                  JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_DefinePropertyById(JSContext *cx, JSObject *obj, jsid id, jsval value,
                      JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id, jsval descriptor, JSBool *bp);

/*
 * Determine the attributes (JSPROP_* flags) of a property on a given object.
 *
 * If the object does not have a property by that name, *foundp will be
 * JS_FALSE and the value of *attrsp is undefined.
 */
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttributes(JSContext *cx, JSObject *obj, const char *name,
                         uintN *attrsp, JSBool *foundp);

/*
 * The same, but if the property is native, return its getter and setter via
 * *getterp and *setterp, respectively (and only if the out parameter pointer
 * is not null).
 */
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *obj,
                                   const char *name,
                                   uintN *attrsp, JSBool *foundp,
                                   JSPropertyOp *getterp,
                                   JSStrictPropertyOp *setterp);

extern JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetterById(JSContext *cx, JSObject *obj,
                                       jsid id,
                                       uintN *attrsp, JSBool *foundp,
                                       JSPropertyOp *getterp,
                                       JSStrictPropertyOp *setterp);

/*
 * Set the attributes of a property on a given object.
 *
 * If the object does not have a property by that name, *foundp will be
 * JS_FALSE and nothing will be altered.
 */
extern JS_PUBLIC_API(JSBool)
JS_SetPropertyAttributes(JSContext *cx, JSObject *obj, const char *name,
                         uintN attrs, JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_DefinePropertyWithTinyId(JSContext *cx, JSObject *obj, const char *name,
                            int8 tinyid, jsval value,
                            JSPropertyOp getter, JSStrictPropertyOp setter,
                            uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_AliasProperty(JSContext *cx, JSObject *obj, const char *name,
                 const char *alias);

extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnProperty(JSContext *cx, JSObject *obj, const char *name,
                         JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnPropertyById(JSContext *cx, JSObject *obj, jsid id,
                             JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_HasProperty(JSContext *cx, JSObject *obj, const char *name, JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_HasPropertyById(JSContext *cx, JSObject *obj, jsid id, JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_LookupProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, const char *name,
                           uintN flags, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlagsById(JSContext *cx, JSObject *obj, jsid id,
                               uintN flags, JSObject **objp, jsval *vp);

struct JSPropertyDescriptor {
    JSObject           *obj;
    uintN              attrs;
    JSPropertyOp       getter;
    JSStrictPropertyOp setter;
    jsval              value;
    uintN              shortid;
};

/*
 * Like JS_GetPropertyAttrsGetterAndSetterById but will return a property on
 * an object on the prototype chain (returned in objp). If data->obj is null,
 * then this property was not found on the prototype chain.
 */
extern JS_PUBLIC_API(JSBool)
JS_GetPropertyDescriptorById(JSContext *cx, JSObject *obj, jsid id, uintN flags,
                             JSPropertyDescriptor *desc);

extern JS_PUBLIC_API(JSBool)
JS_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetPropertyDefault(JSContext *cx, JSObject *obj, const char *name, jsval def, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetPropertyByIdDefault(JSContext *cx, JSObject *obj, jsid id, jsval def, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetMethodById(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
                 jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetMethod(JSContext *cx, JSObject *obj, const char *name, JSObject **objp,
             jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_SetProperty(JSContext *cx, JSObject *obj, const char *name, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_SetPropertyById(JSContext *cx, JSObject *obj, jsid id, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_DeleteProperty(JSContext *cx, JSObject *obj, const char *name);

extern JS_PUBLIC_API(JSBool)
JS_DeleteProperty2(JSContext *cx, JSObject *obj, const char *name,
                   jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_DeletePropertyById(JSContext *cx, JSObject *obj, jsid id);

extern JS_PUBLIC_API(JSBool)
JS_DeletePropertyById2(JSContext *cx, JSObject *obj, jsid id, jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_DefineUCProperty(JSContext *cx, JSObject *obj,
                    const jschar *name, size_t namelen, jsval value,
                    JSPropertyOp getter, JSStrictPropertyOp setter,
                    uintN attrs);

/*
 * Determine the attributes (JSPROP_* flags) of a property on a given object.
 *
 * If the object does not have a property by that name, *foundp will be
 * JS_FALSE and the value of *attrsp is undefined.
 */
extern JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttributes(JSContext *cx, JSObject *obj,
                           const jschar *name, size_t namelen,
                           uintN *attrsp, JSBool *foundp);

/*
 * The same, but if the property is native, return its getter and setter via
 * *getterp and *setterp, respectively (and only if the out parameter pointer
 * is not null).
 */
extern JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *obj,
                                     const jschar *name, size_t namelen,
                                     uintN *attrsp, JSBool *foundp,
                                     JSPropertyOp *getterp,
                                     JSStrictPropertyOp *setterp);

/*
 * Set the attributes of a property on a given object.
 *
 * If the object does not have a property by that name, *foundp will be
 * JS_FALSE and nothing will be altered.
 */
extern JS_PUBLIC_API(JSBool)
JS_SetUCPropertyAttributes(JSContext *cx, JSObject *obj,
                           const jschar *name, size_t namelen,
                           uintN attrs, JSBool *foundp);


extern JS_PUBLIC_API(JSBool)
JS_DefineUCPropertyWithTinyId(JSContext *cx, JSObject *obj,
                              const jschar *name, size_t namelen,
                              int8 tinyid, jsval value,
                              JSPropertyOp getter, JSStrictPropertyOp setter,
                              uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnUCProperty(JSContext *cx, JSObject *obj, const jschar *name,
                           size_t namelen, JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_HasUCProperty(JSContext *cx, JSObject *obj,
                 const jschar *name, size_t namelen,
                 JSBool *vp);

extern JS_PUBLIC_API(JSBool)
JS_LookupUCProperty(JSContext *cx, JSObject *obj,
                    const jschar *name, size_t namelen,
                    jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetUCProperty(JSContext *cx, JSObject *obj,
                 const jschar *name, size_t namelen,
                 jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_SetUCProperty(JSContext *cx, JSObject *obj,
                 const jschar *name, size_t namelen,
                 jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_DeleteUCProperty2(JSContext *cx, JSObject *obj,
                     const jschar *name, size_t namelen,
                     jsval *rval);

extern JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, jsint length, jsval *vector);

extern JS_PUBLIC_API(JSBool)
JS_IsArrayObject(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSBool)
JS_GetArrayLength(JSContext *cx, JSObject *obj, jsuint *lengthp);

extern JS_PUBLIC_API(JSBool)
JS_SetArrayLength(JSContext *cx, JSObject *obj, jsuint length);

extern JS_PUBLIC_API(JSBool)
JS_HasArrayLength(JSContext *cx, JSObject *obj, jsuint *lengthp);

extern JS_PUBLIC_API(JSBool)
JS_DefineElement(JSContext *cx, JSObject *obj, jsint index, jsval value,
                 JSPropertyOp getter, JSStrictPropertyOp setter, uintN attrs);

extern JS_PUBLIC_API(JSBool)
JS_AliasElement(JSContext *cx, JSObject *obj, const char *name, jsint alias);

extern JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnElement(JSContext *cx, JSObject *obj, jsint index,
                        JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_HasElement(JSContext *cx, JSObject *obj, jsint index, JSBool *foundp);

extern JS_PUBLIC_API(JSBool)
JS_LookupElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_GetElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_SetElement(JSContext *cx, JSObject *obj, jsint index, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_DeleteElement(JSContext *cx, JSObject *obj, jsint index);

extern JS_PUBLIC_API(JSBool)
JS_DeleteElement2(JSContext *cx, JSObject *obj, jsint index, jsval *rval);

extern JS_PUBLIC_API(void)
JS_ClearScope(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSIdArray *)
JS_Enumerate(JSContext *cx, JSObject *obj);

/*
 * Create an object to iterate over enumerable properties of obj, in arbitrary
 * property definition order.  NB: This differs from longstanding for..in loop
 * order, which uses order of property definition in obj.
 */
extern JS_PUBLIC_API(JSObject *)
JS_NewPropertyIterator(JSContext *cx, JSObject *obj);

/*
 * Return true on success with *idp containing the id of the next enumerable
 * property to visit using iterobj, or JSID_IS_VOID if there is no such property
 * left to visit.  Return false on error.
 */
extern JS_PUBLIC_API(JSBool)
JS_NextProperty(JSContext *cx, JSObject *iterobj, jsid *idp);

extern JS_PUBLIC_API(JSBool)
JS_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
               jsval *vp, uintN *attrsp);

extern JS_PUBLIC_API(JSBool)
JS_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval *vp);

extern JS_PUBLIC_API(JSBool)
JS_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval v);

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

/*
 * Security protocol.
 */
struct JSPrincipals {
    char *codebase;

    /* XXX unspecified and unused by Mozilla code -- can we remove these? */
    void * (* getPrincipalArray)(JSContext *cx, JSPrincipals *);
    JSBool (* globalPrivilegesEnabled)(JSContext *cx, JSPrincipals *);

    /* Don't call "destroy"; use reference counting macros below. */
    jsrefcount refcount;

    void   (* destroy)(JSContext *cx, JSPrincipals *);
    JSBool (* subsume)(JSPrincipals *, JSPrincipals *);
};

#ifdef JS_THREADSAFE
#define JSPRINCIPALS_HOLD(cx, principals)   JS_HoldPrincipals(cx,principals)
#define JSPRINCIPALS_DROP(cx, principals)   JS_DropPrincipals(cx,principals)

extern JS_PUBLIC_API(jsrefcount)
JS_HoldPrincipals(JSContext *cx, JSPrincipals *principals);

extern JS_PUBLIC_API(jsrefcount)
JS_DropPrincipals(JSContext *cx, JSPrincipals *principals);

#else
#define JSPRINCIPALS_HOLD(cx, principals)   (++(principals)->refcount)
#define JSPRINCIPALS_DROP(cx, principals)                                     \
    ((--(principals)->refcount == 0)                                          \
     ? ((*(principals)->destroy)((cx), (principals)), 0)                      \
     : (principals)->refcount)
#endif


struct JSSecurityCallbacks {
    JSCheckAccessOp            checkObjectAccess;
    JSPrincipalsTranscoder     principalsTranscoder;
    JSObjectPrincipalsFinder   findObjectPrincipals;
    JSCSPEvalChecker           contentSecurityPolicyAllows;
};

extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_SetRuntimeSecurityCallbacks(JSRuntime *rt, JSSecurityCallbacks *callbacks);

extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_GetRuntimeSecurityCallbacks(JSRuntime *rt);

extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_SetContextSecurityCallbacks(JSContext *cx, JSSecurityCallbacks *callbacks);

extern JS_PUBLIC_API(JSSecurityCallbacks *)
JS_GetSecurityCallbacks(JSContext *cx);

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

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

/*
 * Create the function with the name given by the id. JSID_IS_STRING(id) must
 * be true.
 */
extern JS_PUBLIC_API(JSFunction *)
JS_NewFunctionById(JSContext *cx, JSNative call, uintN nargs, uintN flags,
                   JSObject *parent, jsid id);

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 JSFUN_* flags for fun.
 */
extern JS_PUBLIC_API(uintN)
JS_GetFunctionFlags(JSFunction *fun);

/*
 * Return the arity (length) of fun.
 */
extern JS_PUBLIC_API(uint16)
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(JSBool)
JS_ObjectIsFunction(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSBool)
JS_ObjectIsCallable(JSContext *cx, JSObject *obj);

extern JS_PUBLIC_API(JSBool)
JS_DefineFunctions(JSContext *cx, JSObject *obj, JSFunctionSpec *fs);

extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunction(JSContext *cx, JSObject *obj, const char *name, JSNative call,
                  uintN nargs, uintN attrs);

extern JS_PUBLIC_API(JSFunction *)
JS_DefineUCFunction(JSContext *cx, JSObject *obj,
                    const jschar *name, size_t namelen, JSNative call,
                    uintN nargs, uintN attrs);

extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunctionById(JSContext *cx, JSObject *obj, jsid id, JSNative call,
                      uintN nargs, uintN attrs);

extern JS_PUBLIC_API(JSObject *)
JS_CloneFunctionObject(JSContext *cx, JSObject *funobj, JSObject *parent);

/*
 * Given a buffer, return JS_FALSE if the buffer might become a valid
 * javascript statement with the addition of more lines.  Otherwise return
 * JS_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(JSBool)
JS_BufferIsCompilableUnit(JSContext *cx, JSObject *obj,
                          const char *bytes, size_t length);

/*
 * The JSScript objects returned by the following functions refer to string and
 * other kinds of literals, including doubles and RegExp objects.  These
 * literals are vulnerable to garbage collection; to root script objects and
 * prevent literals from being collected, create a rootable object using
 * JS_NewScriptObject, and root the resulting object using JS_Add[Named]Root.
 */
extern JS_PUBLIC_API(JSScript *)
JS_CompileScript(JSContext *cx, JSObject *obj,
                 const char *bytes, size_t length,
                 const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSScript *)
JS_CompileScriptForPrincipals(JSContext *cx, JSObject *obj,
                              JSPrincipals *principals,
                              const char *bytes, size_t length,
                              const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSScript *)
JS_CompileScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                     JSPrincipals *principals,
                                     const char *bytes, size_t length,
                                     const char *filename, uintN lineno,
                                     JSVersion version);

extern JS_PUBLIC_API(JSScript *)
JS_CompileUCScript(JSContext *cx, JSObject *obj,
                   const jschar *chars, size_t length,
                   const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSScript *)
JS_CompileUCScriptForPrincipals(JSContext *cx, JSObject *obj,
                                JSPrincipals *principals,
                                const jschar *chars, size_t length,
                                const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSScript *)
JS_CompileUCScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                       JSPrincipals *principals,
                                       const jschar *chars, size_t length,
                                       const char *filename, uintN lineno,
                                       JSVersion version);

extern JS_PUBLIC_API(JSScript *)
JS_CompileFile(JSContext *cx, JSObject *obj, const char *filename);

extern JS_PUBLIC_API(JSScript *)
JS_CompileFileHandle(JSContext *cx, JSObject *obj, const char *filename,
                     FILE *fh);

extern JS_PUBLIC_API(JSScript *)
JS_CompileFileHandleForPrincipals(JSContext *cx, JSObject *obj,
                                  const char *filename, FILE *fh,
                                  JSPrincipals *principals);

extern JS_PUBLIC_API(JSScript *)
JS_CompileFileHandleForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                         const char *filename, FILE *fh,
                                         JSPrincipals *principals,
                                         JSVersion version);

/*
 * NB: you must use JS_NewScriptObject and root a pointer to its return value
 * in order to keep a JSScript and its atoms safe from garbage collection after
 * creating the script via JS_Compile* and before a JS_ExecuteScript* call.
 * E.g., and without error checks:
 *
 *    JSScript *script = JS_CompileFile(cx, global, filename);
 *    JSObject *scrobj = JS_NewScriptObject(cx, script);
 *    JS_AddNamedObjectRoot(cx, &scrobj, "scrobj");
 *    do {
 *        jsval result;
 *        JS_ExecuteScript(cx, global, script, &result);
 *        JS_GC();
 *    } while (!JSVAL_IS_BOOLEAN(result) || JSVAL_TO_BOOLEAN(result));
 *    JS_RemoveObjectRoot(cx, &scrobj);
 */
extern JS_PUBLIC_API(JSObject *)
JS_NewScriptObject(JSContext *cx, JSScript *script);

/*
 * Infallible getter for a script's object.  If JS_NewScriptObject has not been
 * called on script yet, the return value will be null.
 */
extern JS_PUBLIC_API(JSObject *)
JS_GetScriptObject(JSScript *script);

extern JS_PUBLIC_API(void)
JS_DestroyScript(JSContext *cx, JSScript *script);

extern JS_PUBLIC_API(JSFunction *)
JS_CompileFunction(JSContext *cx, JSObject *obj, const char *name,
                   uintN nargs, const char **argnames,
                   const char *bytes, size_t length,
                   const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSFunction *)
JS_CompileFunctionForPrincipals(JSContext *cx, JSObject *obj,
                                JSPrincipals *principals, const char *name,
                                uintN nargs, const char **argnames,
                                const char *bytes, size_t length,
                                const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunction(JSContext *cx, JSObject *obj, const char *name,
                     uintN nargs, const char **argnames,
                     const jschar *chars, size_t length,
                     const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunctionForPrincipals(JSContext *cx, JSObject *obj,
                                  JSPrincipals *principals, const char *name,
                                  uintN nargs, const char **argnames,
                                  const jschar *chars, size_t length,
                                  const char *filename, uintN lineno);

extern JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunctionForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                         JSPrincipals *principals, const char *name,
                                         uintN nargs, const char **argnames,
                                         const jschar *chars, size_t length,
                                         const char *filename, uintN lineno,
                                         JSVersion version);

extern JS_PUBLIC_API(JSString *)
JS_DecompileScript(JSContext *cx, JSScript *script, const char *name,
                   uintN indent);

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

extern JS_PUBLIC_API(JSString *)
JS_DecompileFunction(JSContext *cx, JSFunction *fun, uintN indent);

extern JS_PUBLIC_API(JSString *)
JS_DecompileFunctionBody(JSContext *cx, JSFunction *fun, uintN indent);

/*
 * NB: JS_ExecuteScript and the JS_Evaluate*Script* quadruplets use the obj
 * parameter as the initial scope chain header, the 'this' keyword value, and
 * the variables object (ECMA parlance for where 'var' and 'function' bind
 * names) of the execution context for script.
 *
 * Using obj as the variables object is problematic if obj's parent (which is
 * the scope chain link; see JS_SetParent and JS_NewObject) is not null: in
 * this case, variables created by 'var x = 0', e.g., go in obj, but variables
 * created by assignment to an unbound id, 'x = 0', go in the last object on
 * the scope chain linked by parent.
 *
 * ECMA calls that last scoping object the "global object", but note that many
 * embeddings have several such objects.  ECMA requires that "global code" be
 * executed with the variables object equal to this global object.  But these
 * JS API entry points provide freedom to execute code against a "sub-global",
 * i.e., a parented or scoped object, in which case the variables object will
 * differ from the last object on the scope chain, resulting in confusing and
 * non-ECMA explicit vs. implicit variable creation.
 *
 * Caveat embedders: unless you already depend on this buggy variables object
 * binding behavior, you should call JS_SetOptions(cx, JSOPTION_VAROBJFIX) or
 * JS_SetOptions(cx, JS_GetOptions(cx) | JSOPTION_VAROBJFIX) -- the latter if
 * someone may have set other options on cx already -- for each context in the
 * application, if you pass parented objects as the obj parameter, or may ever
 * pass such objects in the future.
 *
 * Why a runtime option?  The alternative is to add six or so new API entry
 * points with signatures matching the following six, 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 JS_SetOption call,
 * 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_EvaluateScript,
 * etc., entry points.
 */
extern JS_PUBLIC_API(JSBool)
JS_ExecuteScript(JSContext *cx, JSObject *obj, JSScript *script, jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_ExecuteScriptVersion(JSContext *cx, JSObject *obj, JSScript *script, jsval *rval,
                        JSVersion version);

/*
 * Execute either the function-defining prolog of a script, or the script's
 * main body, but not both.
 */
typedef enum JSExecPart { JSEXEC_PROLOG, JSEXEC_MAIN } JSExecPart;

extern JS_PUBLIC_API(JSBool)
JS_EvaluateScript(JSContext *cx, JSObject *obj,
                  const char *bytes, uintN length,
                  const char *filename, uintN lineno,
                  jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipals(JSContext *cx, JSObject *obj,
                               JSPrincipals *principals,
                               const char *bytes, uintN length,
                               const char *filename, uintN lineno,
                               jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                      JSPrincipals *principals,
                                      const char *bytes, uintN length,
                                      const char *filename, uintN lineno,
                                      jsval *rval, JSVersion version);

extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScript(JSContext *cx, JSObject *obj,
                    const jschar *chars, uintN length,
                    const char *filename, uintN lineno,
                    jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipalsVersion(JSContext *cx, JSObject *obj,
                                        JSPrincipals *principals,
                                        const jschar *chars, uintN length,
                                        const char *filename, uintN lineno,
                                        jsval *rval, JSVersion version);

extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipals(JSContext *cx, JSObject *obj,
                                 JSPrincipals *principals,
                                 const jschar *chars, uintN length,
                                 const char *filename, uintN lineno,
                                 jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_CallFunction(JSContext *cx, JSObject *obj, JSFunction *fun, uintN argc,
                jsval *argv, jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_CallFunctionName(JSContext *cx, JSObject *obj, const char *name, uintN argc,
                    jsval *argv, jsval *rval);

extern JS_PUBLIC_API(JSBool)
JS_CallFunctionValue(JSContext *cx, JSObject *obj, jsval fval, uintN argc,
                     jsval *argv, jsval *rval);

#ifdef __cplusplus
JS_END_EXTERN_C

namespace JS {

static inline bool
Call(JSContext *cx, JSObject *thisObj, JSFunction *fun, uintN argc, jsval *argv, jsval *rval) {
    return !!JS_CallFunction(cx, thisObj, fun, argc, argv, rval);
}

static inline bool
Call(JSContext *cx, JSObject *thisObj, const char *name, uintN argc, jsval *argv, jsval *rval) {
    return !!JS_CallFunctionName(cx, thisObj, name, argc, argv, rval);
}

static inline bool
Call(JSContext *cx, JSObject *thisObj, jsval fun, uintN argc, jsval *argv, jsval *rval) {
    return !!JS_CallFunctionValue(cx, thisObj, fun, argc, argv, rval);
}

extern JS_PUBLIC_API(bool)
Call(JSContext *cx, jsval thisv, jsval fun, uintN argc, jsval *argv, jsval *rval);

static inline bool
Call(JSContext *cx, jsval thisv, JSObject *funObj, uintN argc, jsval *argv, jsval *rval) {
    return Call(cx, thisv, OBJECT_TO_JSVAL(funObj), argc, argv, rval);
}

} /* namespace js */

JS_BEGIN_EXTERN_C
#endif /* __cplusplus */

/*
 * These functions allow setting an operation callback that will be called
 * from the thread the context is associated with some time after any thread
 * triggered the callback using JS_TriggerOperationCallback(cx).
 *
 * In a threadsafe build the engine internally triggers operation callbacks
 * under certain circumstances (i.e. GC and title transfer) to force the
 * context to yield its current request, which the engine always
 * automatically does immediately prior to calling the callback function.
 * 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(JSOperationCallback)
JS_SetOperationCallback(JSContext *cx, JSOperationCallback callback);

extern JS_PUBLIC_API(JSOperationCallback)
JS_GetOperationCallback(JSContext *cx);

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

extern JS_PUBLIC_API(void)
JS_TriggerAllOperationCallbacks(JSRuntime *rt);

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

/*
 * Saving and restoring frame chains.
 *
 * These two functions are used to set aside cx's call stack while that stack
 * is inactive. After a call to JS_SaveFrameChain, it looks as if there is no
 * code running on cx. Before calling JS_RestoreFrameChain, cx's call stack
 * must be balanced and all nested calls to JS_SaveFrameChain must have had
 * matching JS_RestoreFrameChain calls.
 *
 * JS_SaveFrameChain deals with cx not having any code running on it. A null
 * return does not signify an error, and JS_RestoreFrameChain handles a null
 * frame pointer argument safely.
 */
extern JS_PUBLIC_API(JSStackFrame *)
JS_SaveFrameChain(JSContext *cx);

extern JS_PUBLIC_API(void)
JS_RestoreFrameChain(JSContext *cx, JSStackFrame *fp);

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

/*
 * 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_InternJSString(JSContext *cx, JSString *str);

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

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

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

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

extern JS_PUBLIC_API(JSString *)
JS_InternUCStringN(JSContext *cx, const jschar *s, size_t length);

extern JS_PUBLIC_API(JSString *)
JS_InternUCString(JSContext *cx, const jschar *s);

extern JS_PUBLIC_API(JSBool)
JS_CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32 *result);

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

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

extern JS_PUBLIC_API(JSBool)
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 interned strings, i.e., strings from JS_InternString or
 * JSID_TO_STRING(id), using JS_GetInternedStringChars*.
 *
 * 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 so only one needs to be rooted. 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 JS_FALSE;
 *   JS_ASSERT(fstr == JS_ASSERT_STRING_IS_FLAT(str));
 *
 *   // in an infallible context, for the same 'str'
 *   const jschar *chars = JS_GetFlatStringChars(fstr)
 *   JS_ASSERT(chars);
 *
 * The CharsZ APIs guarantee that the returned array has a null character at
 * chars[length]. This can require additional copying so clients should prefer
 * APIs without CharsZ if possible. The infallible functions also return
 * null-terminated arrays. (There is no additional cost or non-Z alternative
 * for the infallible functions, so 'Z' is left out of the identifier.)
 */

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

extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsAndLength(JSContext *cx, JSString *str, size_t *length);

extern JS_PUBLIC_API(const jschar *)
JS_GetInternedStringChars(JSString *str);

extern JS_PUBLIC_API(const jschar *)
JS_GetInternedStringCharsAndLength(JSString *str, size_t *length);

extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZ(JSContext *cx, JSString *str);

extern JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZAndLength(JSContext *cx, JSString *str, size_t *length);

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

extern JS_PUBLIC_API(const jschar *)
JS_GetFlatStringChars(JSFlatString *str);

static JS_ALWAYS_INLINE JSFlatString *
JSID_TO_FLAT_STRING(jsid id)
{
    JS_ASSERT(JSID_IS_STRING(id));
    return (JSFlatString *)(JSID_BITS(id));
}

static JS_ALWAYS_INLINE JSFlatString *
JS_ASSERT_STRING_IS_FLAT(JSString *str)
{
    JS_ASSERT(JS_GetFlatStringChars((JSFlatString *)str));
    return (JSFlatString *)str;
}

static JS_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(JSBool)
JS_FlatStringEqualsAscii(JSFlatString *str, const char *asciiBytes);

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

/*
 * This function is now obsolete and behaves the same as JS_NewUCString.  Use
 * JS_NewUCString instead.
 */
extern JS_PUBLIC_API(JSString *)
JS_NewGrowableString(JSContext *cx, jschar *chars, size_t length);

/*
 * Mutable string support.  A string's characters are never mutable in this JS
 * implementation, but a dependent string is a substring of another dependent
 * or immutable string, and a rope is a lazily concatenated string that creates
 * its underlying buffer the first time it is accessed.  Even after a rope
 * creates its underlying buffer, it still considered mutable.  The direct data
 * members of the (opaque to API clients) JSString struct may be changed in a
 * single-threaded way for dependent strings and ropes.
 *
 * Therefore mutable strings (ropes and dependent strings) cannot be used by
 * more than one thread at a time.  You may call JS_MakeStringImmutable to
 * convert the string from a mutable string to an immutable (and therefore
 * thread-safe) string.  The engine takes care of converting ropes and dependent
 * strings to immutable for you if you store strings in multi-threaded objects
 * using JS_SetProperty or kindred API entry points.
 *
 * If you store a JSString pointer in a native data structure that is (safely)
 * accessible to multiple threads, you must call JS_MakeStringImmutable before
 * retiring the store.
 */

/*
 * 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, JSString *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, JSString *left, JSString *right);

/*
 * Convert a dependent string into an independent one.  This function does not
 * change the string's mutability, so the thread safety comments above apply.
 */
extern JS_PUBLIC_API(const jschar *)
JS_UndependString(JSContext *cx, JSString *str);

/*
 * Convert a mutable string (either rope or dependent) into an immutable,
 * thread-safe one.
 */
extern JS_PUBLIC_API(JSBool)
JS_MakeStringImmutable(JSContext *cx, JSString *str);

/*
 * Return JS_TRUE if C (char []) strings passed via the API and internally
 * are UTF-8.
 */
JS_PUBLIC_API(JSBool)
JS_CStringsAreUTF8(void);

/*
 * Update the value to be returned by JS_CStringsAreUTF8(). Once set, it
 * can never be changed. This API must be called before the first call to
 * JS_NewRuntime.
 */
JS_PUBLIC_API(void)
JS_SetCStringsAreUTF8(void);

/*
 * Character encoding support.
 *
 * For both JS_EncodeCharacters and JS_DecodeBytes, set *dstlenp to the size
 * of the destination buffer before the call; on return, *dstlenp contains the
 * number of bytes (JS_EncodeCharacters) or jschars (JS_DecodeBytes) actually
 * stored.  To determine the necessary destination buffer size, make a sizing
 * call that passes NULL 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 NULL, no
 * error is reported on failure, and the functions simply return JS_FALSE.
 *
 * NB: Neither function stores an additional zero byte or jschar after the
 * transcoded string.
 *
 * If JS_CStringsAreUTF8() is true then JS_EncodeCharacters encodes to
 * UTF-8, and JS_DecodeBytes decodes from UTF-8, which may create additional
 * errors if the character sequence is malformed.  If UTF-8 support is
 * disabled, the functions deflate and inflate, respectively.
 */
JS_PUBLIC_API(JSBool)
JS_EncodeCharacters(JSContext *cx, const jschar *src, size_t srclen, char *dst,
                    size_t *dstlenp);

JS_PUBLIC_API(JSBool)
JS_DecodeBytes(JSContext *cx, const char *src, size_t srclen, jschar *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);

/*
 * 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.
 *
 * If JS_CStringsAreUTF8() is true, the string does not fit into the buffer
 * and the the first length bytes ends in the middle of utf-8 encoding for
 * some character, then such partial utf-8 encoding is replaced by zero bytes.
 * This way the result always represents the valid UTF-8 sequence.
 */
JS_PUBLIC_API(size_t)
JS_EncodeStringToBuffer(JSString *str, char *buffer, size_t length);

#ifdef __cplusplus

class JSAutoByteString {
  public:
    JSAutoByteString(JSContext *cx, JSString *str JS_GUARD_OBJECT_NOTIFIER_PARAM)
      : mBytes(JS_EncodeString(cx, str)) {
        JS_ASSERT(cx);
        JS_GUARD_OBJECT_NOTIFIER_INIT;
    }

    JSAutoByteString(JS_GUARD_OBJECT_NOTIFIER_PARAM0)
      : mBytes(NULL) {
        JS_GUARD_OBJECT_NOTIFIER_INIT;
    }

    ~JSAutoByteString() {
        js_free(mBytes);
    }

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

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

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

    char *ptr() const {
        return mBytes;
    }

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

  private:
    char        *mBytes;
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER

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

#endif

/************************************************************************/
/*
 * JSON functions
 */
typedef JSBool (* JSONWriteCallback)(const jschar *buf, uint32 len, void *data);

/*
 * JSON.stringify as specified by ES3.1 (draft)
 */
JS_PUBLIC_API(JSBool)
JS_Stringify(JSContext *cx, jsval *vp, JSObject *replacer, jsval space,
             JSONWriteCallback callback, void *data);

/*
 * Retrieve a toJSON function. If found, set vp to its result.
 */
JS_PUBLIC_API(JSBool)
JS_TryJSON(JSContext *cx, jsval *vp);

/*
 * JSON.parse as specified by ES3.1 (draft)
 */
JS_PUBLIC_API(JSONParser *)
JS_BeginJSONParse(JSContext *cx, jsval *vp);

JS_PUBLIC_API(JSBool)
JS_ConsumeJSONText(JSContext *cx, JSONParser *jp, const jschar *data, uint32 len);

JS_PUBLIC_API(JSBool)
JS_FinishJSONParse(JSContext *cx, JSONParser *jp, jsval reviver);

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

/* API for the HTML5 internal structured cloning algorithm. */

/* The maximum supported structured-clone serialization format version. */
#define JS_STRUCTURED_CLONE_VERSION 1

struct JSStructuredCloneCallbacks {
    ReadStructuredCloneOp read;
    WriteStructuredCloneOp write;
    StructuredCloneErrorOp reportError;
};

JS_PUBLIC_API(JSBool)
JS_ReadStructuredClone(JSContext *cx, const uint64 *data, size_t nbytes,
                       uint32 version, jsval *vp,
                       const JSStructuredCloneCallbacks *optionalCallbacks,
                       void *closure);

/* Note: On success, the caller is responsible for calling js_free(*datap). */
JS_PUBLIC_API(JSBool)
JS_WriteStructuredClone(JSContext *cx, jsval v, uint64 **datap, size_t *nbytesp,
                        const JSStructuredCloneCallbacks *optionalCallbacks,
                        void *closure);

JS_PUBLIC_API(JSBool)
JS_StructuredClone(JSContext *cx, jsval v, jsval *vp,
                   const JSStructuredCloneCallbacks *optionalCallbacks,
                   void *closure);

#ifdef __cplusplus
/* RAII sugar for JS_WriteStructuredClone. */
class JSAutoStructuredCloneBuffer {
    JSContext *cx_;
    uint64 *data_;
    size_t nbytes_;
    uint32 version_;

  public:
    JSAutoStructuredCloneBuffer()
        : cx_(NULL), data_(NULL), nbytes_(0), version_(JS_STRUCTURED_CLONE_VERSION) {}

    ~JSAutoStructuredCloneBuffer() { clear(); }

    JSContext *cx() const { return cx_; }
    uint64 *data() const { return data_; }
    size_t nbytes() const { return nbytes_; }

    void clear(JSContext *cx=NULL) {
        if (data_) {
            if (!cx)
                cx = cx_;
            JS_ASSERT(cx);
            JS_free(cx, data_);
            cx_ = NULL;
            data_ = NULL;
            nbytes_ = 0;
            version_ = 0;
        }
    }

    /*
     * Adopt some memory. It will be automatically freed by the destructor.
     * data must have been allocated using JS_malloc.
     */
    void adopt(JSContext *cx, uint64 *data, size_t nbytes,
               uint32 version=JS_STRUCTURED_CLONE_VERSION) {
        clear(cx);
        cx_ = cx;
        data_ = data;
        nbytes_ = nbytes;
        version_ = version;
    }

    /*
     * Remove the buffer so that it will not be automatically freed.
     * After this, the caller is responsible for calling JS_free(*datap).
     */
    void steal(uint64 **datap, size_t *nbytesp, JSContext **cxp=NULL,
               uint32 *versionp=NULL) {
        *datap = data_;
        *nbytesp = nbytes_;
        if (cxp)
            *cxp = cx_;
        if (versionp)
            *versionp = version_;

        cx_ = NULL;
        data_ = NULL;
        nbytes_ = 0;
        version_ = 0;
    }

    bool read(jsval *vp, JSContext *cx=NULL,
              const JSStructuredCloneCallbacks *optionalCallbacks=NULL,
              void *closure=NULL) const {
        if (!cx)
            cx = cx_;
        JS_ASSERT(cx);
        JS_ASSERT(data_);
        return !!JS_ReadStructuredClone(cx, data_, nbytes_, version_, vp,
                                        optionalCallbacks, closure);
    }

    bool write(JSContext *cx, jsval v,
               const JSStructuredCloneCallbacks *optionalCallbacks=NULL,
               void *closure=NULL) {
        clear(cx);
        cx_ = cx;
        bool ok = !!JS_WriteStructuredClone(cx, v, &data_, &nbytes_,
                                            optionalCallbacks, closure);
        if (!ok) {
            data_ = NULL;
            nbytes_ = 0;
            version_ = JS_STRUCTURED_CLONE_VERSION;
        }
        return ok;
    }

    /**
     * Swap ownership with another JSAutoStructuredCloneBuffer.
     */
    void swap(JSAutoStructuredCloneBuffer &other) {
        JSContext *cx = other.cx_;
        uint64 *data = other.data_;
        size_t nbytes = other.nbytes_;
        uint32 version = other.version_;

        other.cx_ = this->cx_;
        other.data_ = this->data_;
        other.nbytes_ = this->nbytes_;
        other.version_ = this->version_;

        this->cx_ = cx;
        this->data_ = data;
        this->nbytes_ = nbytes;
        this->version_ = version;
    }

  private:
    /* Copy and assignment are not supported. */
    JSAutoStructuredCloneBuffer(const JSAutoStructuredCloneBuffer &other);
    JSAutoStructuredCloneBuffer &operator=(const JSAutoStructuredCloneBuffer &other);
};
#endif

/* API for implementing custom serialization behavior (for ImageData, File, etc.) */

/* The range of tag values the application may use for its own custom object types. */
#define JS_SCTAG_USER_MIN  ((uint32) 0xFFFF8000)
#define JS_SCTAG_USER_MAX  ((uint32) 0xFFFFFFFF)

#define JS_SCERR_RECURSION 0

JS_PUBLIC_API(void)
JS_SetStructuredCloneCallbacks(JSRuntime *rt, const JSStructuredCloneCallbacks *callbacks);

JS_PUBLIC_API(JSBool)
JS_ReadUint32Pair(JSStructuredCloneReader *r, uint32 *p1, uint32 *p2);

JS_PUBLIC_API(JSBool)
JS_ReadBytes(JSStructuredCloneReader *r, void *p, size_t len);

JS_PUBLIC_API(JSBool)
JS_WriteUint32Pair(JSStructuredCloneWriter *w, uint32 tag, uint32 data);

JS_PUBLIC_API(JSBool)
JS_WriteBytes(JSStructuredCloneWriter *w, const void *p, size_t len);

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

/*
 * Locale specific string conversion and error message callbacks.
 */
struct JSLocaleCallbacks {
    JSLocaleToUpperCase     localeToUpperCase;
    JSLocaleToLowerCase     localeToLowerCase;
    JSLocaleCompare         localeCompare;
    JSLocaleToUnicode       localeToUnicode;
    JSErrorCallback         localeGetErrorMessage;
};

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

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

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

/*
 * Error reporting.
 */

/*
 * Report an exception represented by the sprintf-like conversion of format
 * and its arguments.  This exception message string is passed to a pre-set
 * JSErrorReporter function (set by JS_SetErrorReporter; see jspubtd.h for
 * the JSErrorReporter typedef).
 */
extern JS_PUBLIC_API(void)
JS_ReportError(JSContext *cx, const char *format, ...);

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

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

/*
 * 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(JSBool)
JS_ReportWarning(JSContext *cx, const char *format, ...);

extern JS_PUBLIC_API(JSBool)
JS_ReportErrorFlagsAndNumber(JSContext *cx, uintN flags,
                             JSErrorCallback errorCallback, void *userRef,
                             const uintN errorNumber, ...);

extern JS_PUBLIC_API(JSBool)