1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123
use crate::def::{CtorKind, DefKind, Res};
use crate::def_id::DefId;
pub(crate) use crate::hir_id::{HirId, ItemLocalId, OwnerId};
use crate::intravisit::FnKind;
use crate::LangItem;
use rustc_ast as ast;
use rustc_ast::util::parser::ExprPrecedence;
use rustc_ast::{Attribute, FloatTy, IntTy, Label, LitKind, TraitObjectSyntax, UintTy};
pub use rustc_ast::{BindingAnnotation, BorrowKind, ByRef, ImplPolarity, IsAuto};
pub use rustc_ast::{CaptureBy, Movability, Mutability};
use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sorted_map::SortedMap;
use rustc_error_messages::MultiSpan;
use rustc_index::IndexVec;
use rustc_macros::HashStable_Generic;
use rustc_span::hygiene::MacroKind;
use rustc_span::source_map::Spanned;
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::ErrorGuaranteed;
use rustc_span::{def_id::LocalDefId, BytePos, Span, DUMMY_SP};
use rustc_target::asm::InlineAsmRegOrRegClass;
use rustc_target::spec::abi::Abi;
use smallvec::SmallVec;
use std::fmt;
#[derive(Debug, Copy, Clone, HashStable_Generic)]
pub struct Lifetime {
pub hir_id: HirId,
/// Either "`'a`", referring to a named lifetime definition,
/// `'_` referring to an anonymous lifetime (either explicitly `'_` or `&type`),
/// or "``" (i.e., `kw::Empty`) when appearing in path.
///
/// See `Lifetime::suggestion_position` for practical use.
pub ident: Ident,
/// Semantics of this lifetime.
pub res: LifetimeName,
}
#[derive(Debug, Copy, Clone, HashStable_Generic)]
pub enum ParamName {
/// Some user-given name like `T` or `'x`.
Plain(Ident),
/// Synthetic name generated when user elided a lifetime in an impl header.
///
/// E.g., the lifetimes in cases like these:
/// ```ignore (fragment)
/// impl Foo for &u32
/// impl Foo<'_> for u32
/// ```
/// in that case, we rewrite to
/// ```ignore (fragment)
/// impl<'f> Foo for &'f u32
/// impl<'f> Foo<'f> for u32
/// ```
/// where `'f` is something like `Fresh(0)`. The indices are
/// unique per impl, but not necessarily continuous.
Fresh,
/// Indicates an illegal name was given and an error has been
/// reported (so we should squelch other derived errors). Occurs
/// when, e.g., `'_` is used in the wrong place.
Error,
}
impl ParamName {
pub fn ident(&self) -> Ident {
match *self {
ParamName::Plain(ident) => ident,
ParamName::Fresh | ParamName::Error => Ident::with_dummy_span(kw::UnderscoreLifetime),
}
}
pub fn normalize_to_macros_2_0(&self) -> ParamName {
match *self {
ParamName::Plain(ident) => ParamName::Plain(ident.normalize_to_macros_2_0()),
param_name => param_name,
}
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, HashStable_Generic)]
pub enum LifetimeName {
/// User-given names or fresh (synthetic) names.
Param(LocalDefId),
/// Implicit lifetime in a context like `dyn Foo`. This is
/// distinguished from implicit lifetimes elsewhere because the
/// lifetime that they default to must appear elsewhere within the
/// enclosing type. This means that, in an `impl Trait` context, we
/// don't have to create a parameter for them. That is, `impl
/// Trait<Item = &u32>` expands to an opaque type like `type
/// Foo<'a> = impl Trait<Item = &'a u32>`, but `impl Trait<item =
/// dyn Bar>` expands to `type Foo = impl Trait<Item = dyn Bar +
/// 'static>`. The latter uses `ImplicitObjectLifetimeDefault` so
/// that surrounding code knows not to create a lifetime
/// parameter.
ImplicitObjectLifetimeDefault,
/// Indicates an error during lowering (usually `'_` in wrong place)
/// that was already reported.
Error,
/// User wrote an anonymous lifetime, either `'_` or nothing.
/// The semantics of this lifetime should be inferred by typechecking code.
Infer,
/// User wrote `'static`.
Static,
}
impl LifetimeName {
pub fn is_elided(&self) -> bool {
match self {
LifetimeName::ImplicitObjectLifetimeDefault | LifetimeName::Infer => true,
// It might seem surprising that `Fresh` counts as not *elided*
// -- but this is because, as far as the code in the compiler is
// concerned -- `Fresh` variants act equivalently to "some fresh name".
// They correspond to early-bound regions on an impl, in other words.
LifetimeName::Error | LifetimeName::Param(..) | LifetimeName::Static => false,
}
}
}
impl fmt::Display for Lifetime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.ident.name != kw::Empty { self.ident.name.fmt(f) } else { "'_".fmt(f) }
}
}
pub enum LifetimeSuggestionPosition {
/// The user wrote `'a` or `'_`.
Normal,
/// The user wrote `&type` or `&mut type`.
Ampersand,
/// The user wrote `Path` and omitted the `<'_>`.
ElidedPath,
/// The user wrote `Path<T>`, and omitted the `'_,`.
ElidedPathArgument,
/// The user wrote `dyn Trait` and omitted the `+ '_`.
ObjectDefault,
}
impl Lifetime {
pub fn is_elided(&self) -> bool {
self.res.is_elided()
}
pub fn is_anonymous(&self) -> bool {
self.ident.name == kw::Empty || self.ident.name == kw::UnderscoreLifetime
}
pub fn suggestion_position(&self) -> (LifetimeSuggestionPosition, Span) {
if self.ident.name == kw::Empty {
if self.ident.span.is_empty() {
(LifetimeSuggestionPosition::ElidedPathArgument, self.ident.span)
} else {
(LifetimeSuggestionPosition::ElidedPath, self.ident.span.shrink_to_hi())
}
} else if self.res == LifetimeName::ImplicitObjectLifetimeDefault {
(LifetimeSuggestionPosition::ObjectDefault, self.ident.span)
} else if self.ident.span.is_empty() {
(LifetimeSuggestionPosition::Ampersand, self.ident.span)
} else {
(LifetimeSuggestionPosition::Normal, self.ident.span)
}
}
pub fn is_static(&self) -> bool {
self.res == LifetimeName::Static
}
}
/// A `Path` is essentially Rust's notion of a name; for instance,
/// `std::cmp::PartialEq`. It's represented as a sequence of identifiers,
/// along with a bunch of supporting information.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Path<'hir, R = Res> {
pub span: Span,
/// The resolution for the path.
pub res: R,
/// The segments in the path: the things separated by `::`.
pub segments: &'hir [PathSegment<'hir>],
}
/// Up to three resolutions for type, value and macro namespaces.
pub type UsePath<'hir> = Path<'hir, SmallVec<[Res; 3]>>;
impl Path<'_> {
pub fn is_global(&self) -> bool {
!self.segments.is_empty() && self.segments[0].ident.name == kw::PathRoot
}
}
/// A segment of a path: an identifier, an optional lifetime, and a set of
/// types.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct PathSegment<'hir> {
/// The identifier portion of this path segment.
pub ident: Ident,
pub hir_id: HirId,
pub res: Res,
/// Type/lifetime parameters attached to this path. They come in
/// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. Note that
/// this is more than just simple syntactic sugar; the use of
/// parens affects the region binding rules, so we preserve the
/// distinction.
pub args: Option<&'hir GenericArgs<'hir>>,
/// Whether to infer remaining type parameters, if any.
/// This only applies to expression and pattern paths, and
/// out of those only the segments with no type parameters
/// to begin with, e.g., `Vec::new` is `<Vec<..>>::new::<..>`.
pub infer_args: bool,
}
impl<'hir> PathSegment<'hir> {
/// Converts an identifier to the corresponding segment.
pub fn new(ident: Ident, hir_id: HirId, res: Res) -> PathSegment<'hir> {
PathSegment { ident, hir_id, res, infer_args: true, args: None }
}
pub fn invalid() -> Self {
Self::new(Ident::empty(), HirId::INVALID, Res::Err)
}
pub fn args(&self) -> &GenericArgs<'hir> {
if let Some(ref args) = self.args {
args
} else {
const DUMMY: &GenericArgs<'_> = &GenericArgs::none();
DUMMY
}
}
}
#[derive(Clone, Copy, Debug, HashStable_Generic)]
pub struct ConstArg {
pub value: AnonConst,
pub span: Span,
}
#[derive(Clone, Copy, Debug, HashStable_Generic)]
pub struct InferArg {
pub hir_id: HirId,
pub span: Span,
}
impl InferArg {
pub fn to_ty(&self) -> Ty<'_> {
Ty { kind: TyKind::Infer, span: self.span, hir_id: self.hir_id }
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum GenericArg<'hir> {
Lifetime(&'hir Lifetime),
Type(&'hir Ty<'hir>),
Const(ConstArg),
Infer(InferArg),
}
impl GenericArg<'_> {
pub fn span(&self) -> Span {
match self {
GenericArg::Lifetime(l) => l.ident.span,
GenericArg::Type(t) => t.span,
GenericArg::Const(c) => c.span,
GenericArg::Infer(i) => i.span,
}
}
pub fn hir_id(&self) -> HirId {
match self {
GenericArg::Lifetime(l) => l.hir_id,
GenericArg::Type(t) => t.hir_id,
GenericArg::Const(c) => c.value.hir_id,
GenericArg::Infer(i) => i.hir_id,
}
}
pub fn is_synthetic(&self) -> bool {
matches!(self, GenericArg::Lifetime(lifetime) if lifetime.ident == Ident::empty())
}
pub fn descr(&self) -> &'static str {
match self {
GenericArg::Lifetime(_) => "lifetime",
GenericArg::Type(_) => "type",
GenericArg::Const(_) => "constant",
GenericArg::Infer(_) => "inferred",
}
}
pub fn to_ord(&self) -> ast::ParamKindOrd {
match self {
GenericArg::Lifetime(_) => ast::ParamKindOrd::Lifetime,
GenericArg::Type(_) | GenericArg::Const(_) | GenericArg::Infer(_) => {
ast::ParamKindOrd::TypeOrConst
}
}
}
pub fn is_ty_or_const(&self) -> bool {
match self {
GenericArg::Lifetime(_) => false,
GenericArg::Type(_) | GenericArg::Const(_) | GenericArg::Infer(_) => true,
}
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct GenericArgs<'hir> {
/// The generic arguments for this path segment.
pub args: &'hir [GenericArg<'hir>],
/// Bindings (equality constraints) on associated types, if present.
/// E.g., `Foo<A = Bar>`.
pub bindings: &'hir [TypeBinding<'hir>],
/// Were arguments written in parenthesized form `Fn(T) -> U`?
/// This is required mostly for pretty-printing and diagnostics,
/// but also for changing lifetime elision rules to be "function-like".
pub parenthesized: GenericArgsParentheses,
/// The span encompassing arguments and the surrounding brackets `<>` or `()`
/// Foo<A, B, AssocTy = D> Fn(T, U, V) -> W
/// ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^
/// Note that this may be:
/// - empty, if there are no generic brackets (but there may be hidden lifetimes)
/// - dummy, if this was generated while desugaring
pub span_ext: Span,
}
impl<'hir> GenericArgs<'hir> {
pub const fn none() -> Self {
Self {
args: &[],
bindings: &[],
parenthesized: GenericArgsParentheses::No,
span_ext: DUMMY_SP,
}
}
pub fn inputs(&self) -> &[Ty<'hir>] {
if self.parenthesized == GenericArgsParentheses::ParenSugar {
for arg in self.args {
match arg {
GenericArg::Lifetime(_) => {}
GenericArg::Type(ref ty) => {
if let TyKind::Tup(ref tys) = ty.kind {
return tys;
}
break;
}
GenericArg::Const(_) => {}
GenericArg::Infer(_) => {}
}
}
}
panic!("GenericArgs::inputs: not a `Fn(T) -> U`");
}
#[inline]
pub fn has_type_params(&self) -> bool {
self.args.iter().any(|arg| matches!(arg, GenericArg::Type(_)))
}
pub fn has_err(&self) -> bool {
self.args.iter().any(|arg| match arg {
GenericArg::Type(ty) => matches!(ty.kind, TyKind::Err(_)),
_ => false,
}) || self.bindings.iter().any(|arg| match arg.kind {
TypeBindingKind::Equality { term: Term::Ty(ty) } => matches!(ty.kind, TyKind::Err(_)),
_ => false,
})
}
#[inline]
pub fn num_type_params(&self) -> usize {
self.args.iter().filter(|arg| matches!(arg, GenericArg::Type(_))).count()
}
#[inline]
pub fn num_lifetime_params(&self) -> usize {
self.args.iter().filter(|arg| matches!(arg, GenericArg::Lifetime(_))).count()
}
#[inline]
pub fn has_lifetime_params(&self) -> bool {
self.args.iter().any(|arg| matches!(arg, GenericArg::Lifetime(_)))
}
#[inline]
/// This function returns the number of type and const generic params.
/// It should only be used for diagnostics.
pub fn num_generic_params(&self) -> usize {
self.args.iter().filter(|arg| !matches!(arg, GenericArg::Lifetime(_))).count()
}
/// The span encompassing the text inside the surrounding brackets.
/// It will also include bindings if they aren't in the form `-> Ret`
/// Returns `None` if the span is empty (e.g. no brackets) or dummy
pub fn span(&self) -> Option<Span> {
let span_ext = self.span_ext()?;
Some(span_ext.with_lo(span_ext.lo() + BytePos(1)).with_hi(span_ext.hi() - BytePos(1)))
}
/// Returns span encompassing arguments and their surrounding `<>` or `()`
pub fn span_ext(&self) -> Option<Span> {
Some(self.span_ext).filter(|span| !span.is_empty())
}
pub fn is_empty(&self) -> bool {
self.args.is_empty()
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable_Generic)]
pub enum GenericArgsParentheses {
No,
/// Bounds for `feature(return_type_notation)`, like `T: Trait<method(..): Send>`,
/// where the args are explicitly elided with `..`
ReturnTypeNotation,
/// parenthesized function-family traits, like `T: Fn(u32) -> i32`
ParenSugar,
}
/// A modifier on a bound, currently this is only used for `?Sized`, where the
/// modifier is `Maybe`. Negative bounds should also be handled here.
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
pub enum TraitBoundModifier {
None,
Negative,
Maybe,
MaybeConst,
}
/// The AST represents all type param bounds as types.
/// `typeck::collect::compute_bounds` matches these against
/// the "special" built-in traits (see `middle::lang_items`) and
/// detects `Copy`, `Send` and `Sync`.
#[derive(Clone, Copy, Debug, HashStable_Generic)]
pub enum GenericBound<'hir> {
Trait(PolyTraitRef<'hir>, TraitBoundModifier),
// FIXME(davidtwco): Introduce `PolyTraitRef::LangItem`
LangItemTrait(LangItem, Span, HirId, &'hir GenericArgs<'hir>),
Outlives(&'hir Lifetime),
}
impl GenericBound<'_> {
pub fn trait_ref(&self) -> Option<&TraitRef<'_>> {
match self {
GenericBound::Trait(data, _) => Some(&data.trait_ref),
_ => None,
}
}
pub fn span(&self) -> Span {
match self {
GenericBound::Trait(t, ..) => t.span,
GenericBound::LangItemTrait(_, span, ..) => *span,
GenericBound::Outlives(l) => l.ident.span,
}
}
}
pub type GenericBounds<'hir> = &'hir [GenericBound<'hir>];
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum LifetimeParamKind {
// Indicates that the lifetime definition was explicitly declared (e.g., in
// `fn foo<'a>(x: &'a u8) -> &'a u8 { x }`).
Explicit,
// Indication that the lifetime was elided (e.g., in both cases in
// `fn foo(x: &u8) -> &'_ u8 { x }`).
Elided,
// Indication that the lifetime name was somehow in error.
Error,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum GenericParamKind<'hir> {
/// A lifetime definition (e.g., `'a: 'b + 'c + 'd`).
Lifetime {
kind: LifetimeParamKind,
},
Type {
default: Option<&'hir Ty<'hir>>,
synthetic: bool,
},
Const {
ty: &'hir Ty<'hir>,
/// Optional default value for the const generic param
default: Option<AnonConst>,
},
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct GenericParam<'hir> {
pub hir_id: HirId,
pub def_id: LocalDefId,
pub name: ParamName,
pub span: Span,
pub pure_wrt_drop: bool,
pub kind: GenericParamKind<'hir>,
pub colon_span: Option<Span>,
pub source: GenericParamSource,
}
impl<'hir> GenericParam<'hir> {
/// Synthetic type-parameters are inserted after normal ones.
/// In order for normal parameters to be able to refer to synthetic ones,
/// scans them first.
pub fn is_impl_trait(&self) -> bool {
matches!(self.kind, GenericParamKind::Type { synthetic: true, .. })
}
/// This can happen for `async fn`, e.g. `async fn f<'_>(&'_ self)`.
///
/// See `lifetime_to_generic_param` in `rustc_ast_lowering` for more information.
pub fn is_elided_lifetime(&self) -> bool {
matches!(self.kind, GenericParamKind::Lifetime { kind: LifetimeParamKind::Elided })
}
}
/// Records where the generic parameter originated from.
///
/// This can either be from an item's generics, in which case it's typically
/// early-bound (but can be a late-bound lifetime in functions, for example),
/// or from a `for<...>` binder, in which case it's late-bound (and notably,
/// does not show up in the parent item's generics).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum GenericParamSource {
// Early or late-bound parameters defined on an item
Generics,
// Late-bound parameters defined via a `for<...>`
Binder,
}
#[derive(Default)]
pub struct GenericParamCount {
pub lifetimes: usize,
pub types: usize,
pub consts: usize,
pub infer: usize,
}
/// Represents lifetimes and type parameters attached to a declaration
/// of a function, enum, trait, etc.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Generics<'hir> {
pub params: &'hir [GenericParam<'hir>],
pub predicates: &'hir [WherePredicate<'hir>],
pub has_where_clause_predicates: bool,
pub where_clause_span: Span,
pub span: Span,
}
impl<'hir> Generics<'hir> {
pub const fn empty() -> &'hir Generics<'hir> {
const NOPE: Generics<'_> = Generics {
params: &[],
predicates: &[],
has_where_clause_predicates: false,
where_clause_span: DUMMY_SP,
span: DUMMY_SP,
};
&NOPE
}
pub fn get_named(&self, name: Symbol) -> Option<&GenericParam<'hir>> {
self.params.iter().find(|¶m| name == param.name.ident().name)
}
pub fn spans(&self) -> MultiSpan {
if self.params.is_empty() {
self.span.into()
} else {
self.params.iter().map(|p| p.span).collect::<Vec<Span>>().into()
}
}
/// If there are generic parameters, return where to introduce a new one.
pub fn span_for_lifetime_suggestion(&self) -> Option<Span> {
if let Some(first) = self.params.first()
&& self.span.contains(first.span)
{
// `fn foo<A>(t: impl Trait)`
// ^ suggest `'a, ` here
Some(first.span.shrink_to_lo())
} else {
None
}
}
/// If there are generic parameters, return where to introduce a new one.
pub fn span_for_param_suggestion(&self) -> Option<Span> {
self.params.iter().any(|p| self.span.contains(p.span)).then(|| {
// `fn foo<A>(t: impl Trait)`
// ^ suggest `, T: Trait` here
self.span.with_lo(self.span.hi() - BytePos(1)).shrink_to_lo()
})
}
/// `Span` where further predicates would be suggested, accounting for trailing commas, like
/// in `fn foo<T>(t: T) where T: Foo,` so we don't suggest two trailing commas.
pub fn tail_span_for_predicate_suggestion(&self) -> Span {
let end = self.where_clause_span.shrink_to_hi();
if self.has_where_clause_predicates {
self.predicates
.iter()
.rfind(|&p| p.in_where_clause())
.map_or(end, |p| p.span())
.shrink_to_hi()
.to(end)
} else {
end
}
}
pub fn add_where_or_trailing_comma(&self) -> &'static str {
if self.has_where_clause_predicates {
","
} else if self.where_clause_span.is_empty() {
" where"
} else {
// No where clause predicates, but we have `where` token
""
}
}
pub fn bounds_for_param(
&self,
param_def_id: LocalDefId,
) -> impl Iterator<Item = &WhereBoundPredicate<'hir>> {
self.predicates.iter().filter_map(move |pred| match pred {
WherePredicate::BoundPredicate(bp) if bp.is_param_bound(param_def_id.to_def_id()) => {
Some(bp)
}
_ => None,
})
}
pub fn outlives_for_param(
&self,
param_def_id: LocalDefId,
) -> impl Iterator<Item = &WhereRegionPredicate<'_>> {
self.predicates.iter().filter_map(move |pred| match pred {
WherePredicate::RegionPredicate(rp) if rp.is_param_bound(param_def_id) => Some(rp),
_ => None,
})
}
pub fn bounds_span_for_suggestions(&self, param_def_id: LocalDefId) -> Option<Span> {
self.bounds_for_param(param_def_id).flat_map(|bp| bp.bounds.iter().rev()).find_map(
|bound| {
// We include bounds that come from a `#[derive(_)]` but point at the user's code,
// as we use this method to get a span appropriate for suggestions.
let bs = bound.span();
bs.can_be_used_for_suggestions().then(|| bs.shrink_to_hi())
},
)
}
pub fn span_for_predicate_removal(&self, pos: usize) -> Span {
let predicate = &self.predicates[pos];
let span = predicate.span();
if !predicate.in_where_clause() {
// <T: ?Sized, U>
// ^^^^^^^^
return span;
}
// We need to find out which comma to remove.
if pos < self.predicates.len() - 1 {
let next_pred = &self.predicates[pos + 1];
if next_pred.in_where_clause() {
// where T: ?Sized, Foo: Bar,
// ^^^^^^^^^^^
return span.until(next_pred.span());
}
}
if pos > 0 {
let prev_pred = &self.predicates[pos - 1];
if prev_pred.in_where_clause() {
// where Foo: Bar, T: ?Sized,
// ^^^^^^^^^^^
return prev_pred.span().shrink_to_hi().to(span);
}
}
// This is the only predicate in the where clause.
// where T: ?Sized
// ^^^^^^^^^^^^^^^
self.where_clause_span
}
pub fn span_for_bound_removal(&self, predicate_pos: usize, bound_pos: usize) -> Span {
let predicate = &self.predicates[predicate_pos];
let bounds = predicate.bounds();
if bounds.len() == 1 {
return self.span_for_predicate_removal(predicate_pos);
}
let span = bounds[bound_pos].span();
if bound_pos == 0 {
// where T: ?Sized + Bar, Foo: Bar,
// ^^^^^^^^^
span.to(bounds[1].span().shrink_to_lo())
} else {
// where T: Bar + ?Sized, Foo: Bar,
// ^^^^^^^^^
bounds[bound_pos - 1].span().shrink_to_hi().to(span)
}
}
}
/// A single predicate in a where-clause.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum WherePredicate<'hir> {
/// A type binding (e.g., `for<'c> Foo: Send + Clone + 'c`).
BoundPredicate(WhereBoundPredicate<'hir>),
/// A lifetime predicate (e.g., `'a: 'b + 'c`).
RegionPredicate(WhereRegionPredicate<'hir>),
/// An equality predicate (unsupported).
EqPredicate(WhereEqPredicate<'hir>),
}
impl<'hir> WherePredicate<'hir> {
pub fn span(&self) -> Span {
match self {
WherePredicate::BoundPredicate(p) => p.span,
WherePredicate::RegionPredicate(p) => p.span,
WherePredicate::EqPredicate(p) => p.span,
}
}
pub fn in_where_clause(&self) -> bool {
match self {
WherePredicate::BoundPredicate(p) => p.origin == PredicateOrigin::WhereClause,
WherePredicate::RegionPredicate(p) => p.in_where_clause,
WherePredicate::EqPredicate(_) => false,
}
}
pub fn bounds(&self) -> GenericBounds<'hir> {
match self {
WherePredicate::BoundPredicate(p) => p.bounds,
WherePredicate::RegionPredicate(p) => p.bounds,
WherePredicate::EqPredicate(_) => &[],
}
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic, PartialEq, Eq)]
pub enum PredicateOrigin {
WhereClause,
GenericParam,
ImplTrait,
}
/// A type bound (e.g., `for<'c> Foo: Send + Clone + 'c`).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct WhereBoundPredicate<'hir> {
pub hir_id: HirId,
pub span: Span,
/// Origin of the predicate.
pub origin: PredicateOrigin,
/// Any generics from a `for` binding.
pub bound_generic_params: &'hir [GenericParam<'hir>],
/// The type being bounded.
pub bounded_ty: &'hir Ty<'hir>,
/// Trait and lifetime bounds (e.g., `Clone + Send + 'static`).
pub bounds: GenericBounds<'hir>,
}
impl<'hir> WhereBoundPredicate<'hir> {
/// Returns `true` if `param_def_id` matches the `bounded_ty` of this predicate.
pub fn is_param_bound(&self, param_def_id: DefId) -> bool {
self.bounded_ty.as_generic_param().is_some_and(|(def_id, _)| def_id == param_def_id)
}
}
/// A lifetime predicate (e.g., `'a: 'b + 'c`).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct WhereRegionPredicate<'hir> {
pub span: Span,
pub in_where_clause: bool,
pub lifetime: &'hir Lifetime,
pub bounds: GenericBounds<'hir>,
}
impl<'hir> WhereRegionPredicate<'hir> {
/// Returns `true` if `param_def_id` matches the `lifetime` of this predicate.
pub fn is_param_bound(&self, param_def_id: LocalDefId) -> bool {
self.lifetime.res == LifetimeName::Param(param_def_id)
}
}
/// An equality predicate (e.g., `T = int`); currently unsupported.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct WhereEqPredicate<'hir> {
pub span: Span,
pub lhs_ty: &'hir Ty<'hir>,
pub rhs_ty: &'hir Ty<'hir>,
}
/// HIR node coupled with its parent's id in the same HIR owner.
///
/// The parent is trash when the node is a HIR owner.
#[derive(Clone, Copy, Debug)]
pub struct ParentedNode<'tcx> {
pub parent: ItemLocalId,
pub node: Node<'tcx>,
}
/// Attributes owned by a HIR owner.
#[derive(Debug)]
pub struct AttributeMap<'tcx> {
pub map: SortedMap<ItemLocalId, &'tcx [Attribute]>,
// Only present when the crate hash is needed.
pub opt_hash: Option<Fingerprint>,
}
impl<'tcx> AttributeMap<'tcx> {
pub const EMPTY: &'static AttributeMap<'static> =
&AttributeMap { map: SortedMap::new(), opt_hash: Some(Fingerprint::ZERO) };
#[inline]
pub fn get(&self, id: ItemLocalId) -> &'tcx [Attribute] {
self.map.get(&id).copied().unwrap_or(&[])
}
}
/// Map of all HIR nodes inside the current owner.
/// These nodes are mapped by `ItemLocalId` alongside the index of their parent node.
/// The HIR tree, including bodies, is pre-hashed.
pub struct OwnerNodes<'tcx> {
/// Pre-computed hash of the full HIR. Used in the crate hash. Only present
/// when incr. comp. is enabled.
pub opt_hash_including_bodies: Option<Fingerprint>,
/// Full HIR for the current owner.
// The zeroth node's parent should never be accessed: the owner's parent is computed by the
// hir_owner_parent query. It is set to `ItemLocalId::INVALID` to force an ICE if accidentally
// used.
pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,
/// Content of local bodies.
pub bodies: SortedMap<ItemLocalId, &'tcx Body<'tcx>>,
}
impl<'tcx> OwnerNodes<'tcx> {
pub fn node(&self) -> OwnerNode<'tcx> {
use rustc_index::Idx;
let node = self.nodes[ItemLocalId::new(0)].as_ref().unwrap().node;
let node = node.as_owner().unwrap(); // Indexing must ensure it is an OwnerNode.
node
}
}
impl fmt::Debug for OwnerNodes<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("OwnerNodes")
// Do not print all the pointers to all the nodes, as it would be unreadable.
.field("node", &self.nodes[ItemLocalId::from_u32(0)])
.field(
"parents",
&self
.nodes
.iter_enumerated()
.map(|(id, parented_node)| {
let parented_node = parented_node.as_ref().map(|node| node.parent);
debug_fn(move |f| write!(f, "({id:?}, {parented_node:?})"))
})
.collect::<Vec<_>>(),
)
.field("bodies", &self.bodies)
.field("opt_hash_including_bodies", &self.opt_hash_including_bodies)
.finish()
}
}
/// Full information resulting from lowering an AST node.
#[derive(Debug, HashStable_Generic)]
pub struct OwnerInfo<'hir> {
/// Contents of the HIR.
pub nodes: OwnerNodes<'hir>,
/// Map from each nested owner to its parent's local id.
pub parenting: FxHashMap<LocalDefId, ItemLocalId>,
/// Collected attributes of the HIR nodes.
pub attrs: AttributeMap<'hir>,
/// Map indicating what traits are in scope for places where this
/// is relevant; generated by resolve.
pub trait_map: FxHashMap<ItemLocalId, Box<[TraitCandidate]>>,
}
impl<'tcx> OwnerInfo<'tcx> {
#[inline]
pub fn node(&self) -> OwnerNode<'tcx> {
self.nodes.node()
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum MaybeOwner<T> {
Owner(T),
NonOwner(HirId),
/// Used as a placeholder for unused LocalDefId.
Phantom,
}
impl<T> MaybeOwner<T> {
pub fn as_owner(self) -> Option<T> {
match self {
MaybeOwner::Owner(i) => Some(i),
MaybeOwner::NonOwner(_) | MaybeOwner::Phantom => None,
}
}
pub fn map<U>(self, f: impl FnOnce(T) -> U) -> MaybeOwner<U> {
match self {
MaybeOwner::Owner(i) => MaybeOwner::Owner(f(i)),
MaybeOwner::NonOwner(hir_id) => MaybeOwner::NonOwner(hir_id),
MaybeOwner::Phantom => MaybeOwner::Phantom,
}
}
pub fn unwrap(self) -> T {
match self {
MaybeOwner::Owner(i) => i,
MaybeOwner::NonOwner(_) | MaybeOwner::Phantom => panic!("Not a HIR owner"),
}
}
}
/// The top-level data structure that stores the entire contents of
/// the crate currently being compiled.
///
/// For more details, see the [rustc dev guide].
///
/// [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
#[derive(Debug)]
pub struct Crate<'hir> {
pub owners: IndexVec<LocalDefId, MaybeOwner<&'hir OwnerInfo<'hir>>>,
// Only present when incr. comp. is enabled.
pub opt_hir_hash: Option<Fingerprint>,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Closure<'hir> {
pub def_id: LocalDefId,
pub binder: ClosureBinder,
pub constness: Constness,
pub capture_clause: CaptureBy,
pub bound_generic_params: &'hir [GenericParam<'hir>],
pub fn_decl: &'hir FnDecl<'hir>,
pub body: BodyId,
/// The span of the declaration block: 'move |...| -> ...'
pub fn_decl_span: Span,
/// The span of the argument block `|...|`
pub fn_arg_span: Option<Span>,
pub movability: Option<Movability>,
}
/// A block of statements `{ .. }`, which may have a label (in this case the
/// `targeted_by_break` field will be `true`) and may be `unsafe` by means of
/// the `rules` being anything but `DefaultBlock`.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Block<'hir> {
/// Statements in a block.
pub stmts: &'hir [Stmt<'hir>],
/// An expression at the end of the block
/// without a semicolon, if any.
pub expr: Option<&'hir Expr<'hir>>,
#[stable_hasher(ignore)]
pub hir_id: HirId,
/// Distinguishes between `unsafe { ... }` and `{ ... }`.
pub rules: BlockCheckMode,
pub span: Span,
/// If true, then there may exist `break 'a` values that aim to
/// break out of this block early.
/// Used by `'label: {}` blocks and by `try {}` blocks.
pub targeted_by_break: bool,
}
impl<'hir> Block<'hir> {
pub fn innermost_block(&self) -> &Block<'hir> {
let mut block = self;
while let Some(Expr { kind: ExprKind::Block(inner_block, _), .. }) = block.expr {
block = inner_block;
}
block
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Pat<'hir> {
#[stable_hasher(ignore)]
pub hir_id: HirId,
pub kind: PatKind<'hir>,
pub span: Span,
/// Whether to use default binding modes.
/// At present, this is false only for destructuring assignment.
pub default_binding_modes: bool,
}
impl<'hir> Pat<'hir> {
fn walk_short_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool) -> bool {
if !it(self) {
return false;
}
use PatKind::*;
match self.kind {
Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => true,
Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_short_(it),
Struct(_, fields, _) => fields.iter().all(|field| field.pat.walk_short_(it)),
TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().all(|p| p.walk_short_(it)),
Slice(before, slice, after) => {
before.iter().chain(slice).chain(after.iter()).all(|p| p.walk_short_(it))
}
}
}
/// Walk the pattern in left-to-right order,
/// short circuiting (with `.all(..)`) if `false` is returned.
///
/// Note that when visiting e.g. `Tuple(ps)`,
/// if visiting `ps[0]` returns `false`,
/// then `ps[1]` will not be visited.
pub fn walk_short(&self, mut it: impl FnMut(&Pat<'hir>) -> bool) -> bool {
self.walk_short_(&mut it)
}
fn walk_(&self, it: &mut impl FnMut(&Pat<'hir>) -> bool) {
if !it(self) {
return;
}
use PatKind::*;
match self.kind {
Wild | Lit(_) | Range(..) | Binding(.., None) | Path(_) => {}
Box(s) | Ref(s, _) | Binding(.., Some(s)) => s.walk_(it),
Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk_(it)),
TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().for_each(|p| p.walk_(it)),
Slice(before, slice, after) => {
before.iter().chain(slice).chain(after.iter()).for_each(|p| p.walk_(it))
}
}
}
/// Walk the pattern in left-to-right order.
///
/// If `it(pat)` returns `false`, the children are not visited.
pub fn walk(&self, mut it: impl FnMut(&Pat<'hir>) -> bool) {
self.walk_(&mut it)
}
/// Walk the pattern in left-to-right order.
///
/// If you always want to recurse, prefer this method over `walk`.
pub fn walk_always(&self, mut it: impl FnMut(&Pat<'_>)) {
self.walk(|p| {
it(p);
true
})
}
}
/// A single field in a struct pattern.
///
/// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
/// are treated the same as` x: x, y: ref y, z: ref mut z`,
/// except `is_shorthand` is true.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct PatField<'hir> {
#[stable_hasher(ignore)]
pub hir_id: HirId,
/// The identifier for the field.
pub ident: Ident,
/// The pattern the field is destructured to.
pub pat: &'hir Pat<'hir>,
pub is_shorthand: bool,
pub span: Span,
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum RangeEnd {
Included,
Excluded,
}
impl fmt::Display for RangeEnd {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match self {
RangeEnd::Included => "..=",
RangeEnd::Excluded => "..",
})
}
}
// Equivalent to `Option<usize>`. That type takes up 16 bytes on 64-bit, but
// this type only takes up 4 bytes, at the cost of being restricted to a
// maximum value of `u32::MAX - 1`. In practice, this is more than enough.
#[derive(Clone, Copy, PartialEq, Eq, Hash, HashStable_Generic)]
pub struct DotDotPos(u32);
impl DotDotPos {
/// Panics if n >= u32::MAX.
pub fn new(n: Option<usize>) -> Self {
match n {
Some(n) => {
assert!(n < u32::MAX as usize);
Self(n as u32)
}
None => Self(u32::MAX),
}
}
pub fn as_opt_usize(&self) -> Option<usize> {
if self.0 == u32::MAX { None } else { Some(self.0 as usize) }
}
}
impl fmt::Debug for DotDotPos {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.as_opt_usize().fmt(f)
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum PatKind<'hir> {
/// Represents a wildcard pattern (i.e., `_`).
Wild,
/// A fresh binding `ref mut binding @ OPT_SUBPATTERN`.
/// The `HirId` is the canonical ID for the variable being bound,
/// (e.g., in `Ok(x) | Err(x)`, both `x` use the same canonical ID),
/// which is the pattern ID of the first `x`.
Binding(BindingAnnotation, HirId, Ident, Option<&'hir Pat<'hir>>),
/// A struct or struct variant pattern (e.g., `Variant {x, y, ..}`).
/// The `bool` is `true` in the presence of a `..`.
Struct(QPath<'hir>, &'hir [PatField<'hir>], bool),
/// A tuple struct/variant pattern `Variant(x, y, .., z)`.
/// If the `..` pattern fragment is present, then `DotDotPos` denotes its position.
/// `0 <= position <= subpats.len()`
TupleStruct(QPath<'hir>, &'hir [Pat<'hir>], DotDotPos),
/// An or-pattern `A | B | C`.
/// Invariant: `pats.len() >= 2`.
Or(&'hir [Pat<'hir>]),
/// A path pattern for a unit struct/variant or a (maybe-associated) constant.
Path(QPath<'hir>),
/// A tuple pattern (e.g., `(a, b)`).
/// If the `..` pattern fragment is present, then `Option<usize>` denotes its position.
/// `0 <= position <= subpats.len()`
Tuple(&'hir [Pat<'hir>], DotDotPos),
/// A `box` pattern.
Box(&'hir Pat<'hir>),
/// A reference pattern (e.g., `&mut (a, b)`).
Ref(&'hir Pat<'hir>, Mutability),
/// A literal.
Lit(&'hir Expr<'hir>),
/// A range pattern (e.g., `1..=2` or `1..2`).
Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd),
/// A slice pattern, `[before_0, ..., before_n, (slice, after_0, ..., after_n)?]`.
///
/// Here, `slice` is lowered from the syntax `($binding_mode $ident @)? ..`.
/// If `slice` exists, then `after` can be non-empty.
///
/// The representation for e.g., `[a, b, .., c, d]` is:
/// ```ignore (illustrative)
/// PatKind::Slice([Binding(a), Binding(b)], Some(Wild), [Binding(c), Binding(d)])
/// ```
Slice(&'hir [Pat<'hir>], Option<&'hir Pat<'hir>>, &'hir [Pat<'hir>]),
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum BinOpKind {
/// The `+` operator (addition).
Add,
/// The `-` operator (subtraction).
Sub,
/// The `*` operator (multiplication).
Mul,
/// The `/` operator (division).
Div,
/// The `%` operator (modulus).
Rem,
/// The `&&` operator (logical and).
And,
/// The `||` operator (logical or).
Or,
/// The `^` operator (bitwise xor).
BitXor,
/// The `&` operator (bitwise and).
BitAnd,
/// The `|` operator (bitwise or).
BitOr,
/// The `<<` operator (shift left).
Shl,
/// The `>>` operator (shift right).
Shr,
/// The `==` operator (equality).
Eq,
/// The `<` operator (less than).
Lt,
/// The `<=` operator (less than or equal to).
Le,
/// The `!=` operator (not equal to).
Ne,
/// The `>=` operator (greater than or equal to).
Ge,
/// The `>` operator (greater than).
Gt,
}
impl BinOpKind {
pub fn as_str(self) -> &'static str {
match self {
BinOpKind::Add => "+",
BinOpKind::Sub => "-",
BinOpKind::Mul => "*",
BinOpKind::Div => "/",
BinOpKind::Rem => "%",
BinOpKind::And => "&&",
BinOpKind::Or => "||",
BinOpKind::BitXor => "^",
BinOpKind::BitAnd => "&",
BinOpKind::BitOr => "|",
BinOpKind::Shl => "<<",
BinOpKind::Shr => ">>",
BinOpKind::Eq => "==",
BinOpKind::Lt => "<",
BinOpKind::Le => "<=",
BinOpKind::Ne => "!=",
BinOpKind::Ge => ">=",
BinOpKind::Gt => ">",
}
}
pub fn is_lazy(self) -> bool {
matches!(self, BinOpKind::And | BinOpKind::Or)
}
pub fn is_shift(self) -> bool {
matches!(self, BinOpKind::Shl | BinOpKind::Shr)
}
pub fn is_comparison(self) -> bool {
match self {
BinOpKind::Eq
| BinOpKind::Lt
| BinOpKind::Le
| BinOpKind::Ne
| BinOpKind::Gt
| BinOpKind::Ge => true,
BinOpKind::And
| BinOpKind::Or
| BinOpKind::Add
| BinOpKind::Sub
| BinOpKind::Mul
| BinOpKind::Div
| BinOpKind::Rem
| BinOpKind::BitXor
| BinOpKind::BitAnd
| BinOpKind::BitOr
| BinOpKind::Shl
| BinOpKind::Shr => false,
}
}
/// Returns `true` if the binary operator takes its arguments by value.
pub fn is_by_value(self) -> bool {
!self.is_comparison()
}
}
impl Into<ast::BinOpKind> for BinOpKind {
fn into(self) -> ast::BinOpKind {
match self {
BinOpKind::Add => ast::BinOpKind::Add,
BinOpKind::Sub => ast::BinOpKind::Sub,
BinOpKind::Mul => ast::BinOpKind::Mul,
BinOpKind::Div => ast::BinOpKind::Div,
BinOpKind::Rem => ast::BinOpKind::Rem,
BinOpKind::And => ast::BinOpKind::And,
BinOpKind::Or => ast::BinOpKind::Or,
BinOpKind::BitXor => ast::BinOpKind::BitXor,
BinOpKind::BitAnd => ast::BinOpKind::BitAnd,
BinOpKind::BitOr => ast::BinOpKind::BitOr,
BinOpKind::Shl => ast::BinOpKind::Shl,
BinOpKind::Shr => ast::BinOpKind::Shr,
BinOpKind::Eq => ast::BinOpKind::Eq,
BinOpKind::Lt => ast::BinOpKind::Lt,
BinOpKind::Le => ast::BinOpKind::Le,
BinOpKind::Ne => ast::BinOpKind::Ne,
BinOpKind::Ge => ast::BinOpKind::Ge,
BinOpKind::Gt => ast::BinOpKind::Gt,
}
}
}
pub type BinOp = Spanned<BinOpKind>;
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum UnOp {
/// The `*` operator (dereferencing).
Deref,
/// The `!` operator (logical negation).
Not,
/// The `-` operator (negation).
Neg,
}
impl UnOp {
pub fn as_str(self) -> &'static str {
match self {
Self::Deref => "*",
Self::Not => "!",
Self::Neg => "-",
}
}
/// Returns `true` if the unary operator takes its argument by value.
pub fn is_by_value(self) -> bool {
matches!(self, Self::Neg | Self::Not)
}
}
/// A statement.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Stmt<'hir> {
pub hir_id: HirId,
pub kind: StmtKind<'hir>,
pub span: Span,
}
/// The contents of a statement.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum StmtKind<'hir> {
/// A local (`let`) binding.
Local(&'hir Local<'hir>),
/// An item binding.
Item(ItemId),
/// An expression without a trailing semi-colon (must have unit type).
Expr(&'hir Expr<'hir>),
/// An expression with a trailing semi-colon (may have any type).
Semi(&'hir Expr<'hir>),
}
/// Represents a `let` statement (i.e., `let <pat>:<ty> = <init>;`).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Local<'hir> {
pub pat: &'hir Pat<'hir>,
/// Type annotation, if any (otherwise the type will be inferred).
pub ty: Option<&'hir Ty<'hir>>,
/// Initializer expression to set the value, if any.
pub init: Option<&'hir Expr<'hir>>,
/// Else block for a `let...else` binding.
pub els: Option<&'hir Block<'hir>>,
pub hir_id: HirId,
pub span: Span,
/// Can be `ForLoopDesugar` if the `let` statement is part of a `for` loop
/// desugaring. Otherwise will be `Normal`.
pub source: LocalSource,
}
/// Represents a single arm of a `match` expression, e.g.
/// `<pat> (if <guard>) => <body>`.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Arm<'hir> {
#[stable_hasher(ignore)]
pub hir_id: HirId,
pub span: Span,
/// If this pattern and the optional guard matches, then `body` is evaluated.
pub pat: &'hir Pat<'hir>,
/// Optional guard clause.
pub guard: Option<Guard<'hir>>,
/// The expression the arm evaluates to if this arm matches.
pub body: &'hir Expr<'hir>,
}
/// Represents a `let <pat>[: <ty>] = <expr>` expression (not a Local), occurring in an `if-let` or
/// `let-else`, evaluating to a boolean. Typically the pattern is refutable.
///
/// In an if-let, imagine it as `if (let <pat> = <expr>) { ... }`; in a let-else, it is part of the
/// desugaring to if-let. Only let-else supports the type annotation at present.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Let<'hir> {
pub hir_id: HirId,
pub span: Span,
pub pat: &'hir Pat<'hir>,
pub ty: Option<&'hir Ty<'hir>>,
pub init: &'hir Expr<'hir>,
/// `Some` when this let expressions is not in a syntanctically valid location.
/// Used to prevent building MIR in such situations.
pub is_recovered: Option<ErrorGuaranteed>,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum Guard<'hir> {
If(&'hir Expr<'hir>),
IfLet(&'hir Let<'hir>),
}
impl<'hir> Guard<'hir> {
/// Returns the body of the guard
///
/// In other words, returns the e in either of the following:
///
/// - `if e`
/// - `if let x = e`
pub fn body(&self) -> &'hir Expr<'hir> {
match self {
Guard::If(e) | Guard::IfLet(Let { init: e, .. }) => e,
}
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct ExprField<'hir> {
#[stable_hasher(ignore)]
pub hir_id: HirId,
pub ident: Ident,
pub expr: &'hir Expr<'hir>,
pub span: Span,
pub is_shorthand: bool,
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum BlockCheckMode {
DefaultBlock,
UnsafeBlock(UnsafeSource),
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum UnsafeSource {
CompilerGenerated,
UserProvided,
}
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct BodyId {
pub hir_id: HirId,
}
/// The body of a function, closure, or constant value. In the case of
/// a function, the body contains not only the function body itself
/// (which is an expression), but also the argument patterns, since
/// those are something that the caller doesn't really care about.
///
/// # Examples
///
/// ```
/// fn foo((x, y): (u32, u32)) -> u32 {
/// x + y
/// }
/// ```
///
/// Here, the `Body` associated with `foo()` would contain:
///
/// - an `params` array containing the `(x, y)` pattern
/// - a `value` containing the `x + y` expression (maybe wrapped in a block)
/// - `generator_kind` would be `None`
///
/// All bodies have an **owner**, which can be accessed via the HIR
/// map using `body_owner_def_id()`.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Body<'hir> {
pub params: &'hir [Param<'hir>],
pub value: &'hir Expr<'hir>,
pub generator_kind: Option<GeneratorKind>,
}
impl<'hir> Body<'hir> {
pub fn id(&self) -> BodyId {
BodyId { hir_id: self.value.hir_id }
}
pub fn generator_kind(&self) -> Option<GeneratorKind> {
self.generator_kind
}
}
/// The type of source expression that caused this generator to be created.
#[derive(Clone, PartialEq, Eq, Debug, Copy, Hash)]
#[derive(HashStable_Generic, Encodable, Decodable)]
pub enum GeneratorKind {
/// An explicit `async` block or the body of an async function.
Async(AsyncGeneratorKind),
/// A generator literal created via a `yield` inside a closure.
Gen,
}
impl fmt::Display for GeneratorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
GeneratorKind::Async(k) => fmt::Display::fmt(k, f),
GeneratorKind::Gen => f.write_str("generator"),
}
}
}
impl GeneratorKind {
pub fn descr(&self) -> &'static str {
match self {
GeneratorKind::Async(ask) => ask.descr(),
GeneratorKind::Gen => "generator",
}
}
}
/// In the case of a generator created as part of an async construct,
/// which kind of async construct caused it to be created?
///
/// This helps error messages but is also used to drive coercions in
/// type-checking (see #60424).
#[derive(Clone, PartialEq, Eq, Hash, Debug, Copy)]
#[derive(HashStable_Generic, Encodable, Decodable)]
pub enum AsyncGeneratorKind {
/// An explicit `async` block written by the user.
Block,
/// An explicit `async` closure written by the user.
Closure,
/// The `async` block generated as the body of an async function.
Fn,
}
impl fmt::Display for AsyncGeneratorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match self {
AsyncGeneratorKind::Block => "async block",
AsyncGeneratorKind::Closure => "async closure body",
AsyncGeneratorKind::Fn => "async fn body",
})
}
}
impl AsyncGeneratorKind {
pub fn descr(&self) -> &'static str {
match self {
AsyncGeneratorKind::Block => "`async` block",
AsyncGeneratorKind::Closure => "`async` closure body",
AsyncGeneratorKind::Fn => "`async fn` body",
}
}
}
#[derive(Copy, Clone, Debug)]
pub enum BodyOwnerKind {
/// Functions and methods.
Fn,
/// Closures
Closure,
/// Constants and associated constants, also including inline constants.
Const { inline: bool },
/// Initializer of a `static` item.
Static(Mutability),
}
impl BodyOwnerKind {
pub fn is_fn_or_closure(self) -> bool {
match self {
BodyOwnerKind::Fn | BodyOwnerKind::Closure => true,
BodyOwnerKind::Const { .. } | BodyOwnerKind::Static(_) => false,
}
}
}
/// The kind of an item that requires const-checking.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ConstContext {
/// A `const fn`.
ConstFn,
/// A `static` or `static mut`.
Static(Mutability),
/// A `const`, associated `const`, or other const context.
///
/// Other contexts include:
/// - Array length expressions
/// - Enum discriminants
/// - Const generics
///
/// For the most part, other contexts are treated just like a regular `const`, so they are
/// lumped into the same category.
Const { inline: bool },
}
impl ConstContext {
/// A description of this const context that can appear between backticks in an error message.
///
/// E.g. `const` or `static mut`.
pub fn keyword_name(self) -> &'static str {
match self {
Self::Const { .. } => "const",
Self::Static(Mutability::Not) => "static",
Self::Static(Mutability::Mut) => "static mut",
Self::ConstFn => "const fn",
}
}
}
/// A colloquial, trivially pluralizable description of this const context for use in error
/// messages.
impl fmt::Display for ConstContext {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Self::Const { .. } => write!(f, "constant"),
Self::Static(_) => write!(f, "static"),
Self::ConstFn => write!(f, "constant function"),
}
}
}
// NOTE: `IntoDiagnosticArg` impl for `ConstContext` lives in `rustc_errors`
// due to a cyclical dependency between hir that crate.
/// A literal.
pub type Lit = Spanned<LitKind>;
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum ArrayLen {
Infer(HirId, Span),
Body(AnonConst),
}
impl ArrayLen {
pub fn hir_id(&self) -> HirId {
match self {
&ArrayLen::Infer(hir_id, _) | &ArrayLen::Body(AnonConst { hir_id, .. }) => hir_id,
}
}
}
/// A constant (expression) that's not an item or associated item,
/// but needs its own `DefId` for type-checking, const-eval, etc.
/// These are usually found nested inside types (e.g., array lengths)
/// or expressions (e.g., repeat counts), and also used to define
/// explicit discriminant values for enum variants.
///
/// You can check if this anon const is a default in a const param
/// `const N: usize = { ... }` with `tcx.hir().opt_const_param_default_param_def_id(..)`
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct AnonConst {
pub hir_id: HirId,
pub def_id: LocalDefId,
pub body: BodyId,
}
/// An inline constant expression `const { something }`.
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct ConstBlock {
pub hir_id: HirId,
pub def_id: LocalDefId,
pub body: BodyId,
}
/// An expression.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Expr<'hir> {
pub hir_id: HirId,
pub kind: ExprKind<'hir>,
pub span: Span,
}
impl Expr<'_> {
pub fn precedence(&self) -> ExprPrecedence {
match self.kind {
ExprKind::ConstBlock(_) => ExprPrecedence::ConstBlock,
ExprKind::Array(_) => ExprPrecedence::Array,
ExprKind::Call(..) => ExprPrecedence::Call,
ExprKind::MethodCall(..) => ExprPrecedence::MethodCall,
ExprKind::Tup(_) => ExprPrecedence::Tup,
ExprKind::Binary(op, ..) => ExprPrecedence::Binary(op.node.into()),
ExprKind::Unary(..) => ExprPrecedence::Unary,
ExprKind::Lit(_) => ExprPrecedence::Lit,
ExprKind::Type(..) | ExprKind::Cast(..) => ExprPrecedence::Cast,
ExprKind::DropTemps(ref expr, ..) => expr.precedence(),
ExprKind::If(..) => ExprPrecedence::If,
ExprKind::Let(..) => ExprPrecedence::Let,
ExprKind::Loop(..) => ExprPrecedence::Loop,
ExprKind::Match(..) => ExprPrecedence::Match,
ExprKind::Closure { .. } => ExprPrecedence::Closure,
ExprKind::Block(..) => ExprPrecedence::Block,
ExprKind::Assign(..) => ExprPrecedence::Assign,
ExprKind::AssignOp(..) => ExprPrecedence::AssignOp,
ExprKind::Field(..) => ExprPrecedence::Field,
ExprKind::Index(..) => ExprPrecedence::Index,
ExprKind::Path(..) => ExprPrecedence::Path,
ExprKind::AddrOf(..) => ExprPrecedence::AddrOf,
ExprKind::Break(..) => ExprPrecedence::Break,
ExprKind::Continue(..) => ExprPrecedence::Continue,
ExprKind::Ret(..) => ExprPrecedence::Ret,
ExprKind::Become(..) => ExprPrecedence::Become,
ExprKind::InlineAsm(..) => ExprPrecedence::InlineAsm,
ExprKind::OffsetOf(..) => ExprPrecedence::OffsetOf,
ExprKind::Struct(..) => ExprPrecedence::Struct,
ExprKind::Repeat(..) => ExprPrecedence::Repeat,
ExprKind::Yield(..) => ExprPrecedence::Yield,
ExprKind::Err(_) => ExprPrecedence::Err,
}
}
/// Whether this looks like a place expr, without checking for deref
/// adjustments.
/// This will return `true` in some potentially surprising cases such as
/// `CONSTANT.field`.
pub fn is_syntactic_place_expr(&self) -> bool {
self.is_place_expr(|_| true)
}
/// Whether this is a place expression.
///
/// `allow_projections_from` should return `true` if indexing a field or index expression based
/// on the given expression should be considered a place expression.
pub fn is_place_expr(&self, mut allow_projections_from: impl FnMut(&Self) -> bool) -> bool {
match self.kind {
ExprKind::Path(QPath::Resolved(_, ref path)) => {
matches!(path.res, Res::Local(..) | Res::Def(DefKind::Static(_), _) | Res::Err)
}
// Type ascription inherits its place expression kind from its
// operand. See:
// https://github.com/rust-lang/rfcs/blob/master/text/0803-type-ascription.md#type-ascription-and-temporaries
ExprKind::Type(ref e, _) => e.is_place_expr(allow_projections_from),
ExprKind::Unary(UnOp::Deref, _) => true,
ExprKind::Field(ref base, _) | ExprKind::Index(ref base, _, _) => {
allow_projections_from(base) || base.is_place_expr(allow_projections_from)
}
// Lang item paths cannot currently be local variables or statics.
ExprKind::Path(QPath::LangItem(..)) => false,
// Partially qualified paths in expressions can only legally
// refer to associated items which are always rvalues.
ExprKind::Path(QPath::TypeRelative(..))
| ExprKind::Call(..)
| ExprKind::MethodCall(..)
| ExprKind::Struct(..)
| ExprKind::Tup(..)
| ExprKind::If(..)
| ExprKind::Match(..)
| ExprKind::Closure { .. }
| ExprKind::Block(..)
| ExprKind::Repeat(..)
| ExprKind::Array(..)
| ExprKind::Break(..)
| ExprKind::Continue(..)
| ExprKind::Ret(..)
| ExprKind::Become(..)
| ExprKind::Let(..)
| ExprKind::Loop(..)
| ExprKind::Assign(..)
| ExprKind::InlineAsm(..)
| ExprKind::OffsetOf(..)
| ExprKind::AssignOp(..)
| ExprKind::Lit(_)
| ExprKind::ConstBlock(..)
| ExprKind::Unary(..)
| ExprKind::AddrOf(..)
| ExprKind::Binary(..)
| ExprKind::Yield(..)
| ExprKind::Cast(..)
| ExprKind::DropTemps(..)
| ExprKind::Err(_) => false,
}
}
/// If `Self.kind` is `ExprKind::DropTemps(expr)`, drill down until we get a non-`DropTemps`
/// `Expr`. This is used in suggestions to ignore this `ExprKind` as it is semantically
/// silent, only signaling the ownership system. By doing this, suggestions that check the
/// `ExprKind` of any given `Expr` for presentation don't have to care about `DropTemps`
/// beyond remembering to call this function before doing analysis on it.
pub fn peel_drop_temps(&self) -> &Self {
let mut expr = self;
while let ExprKind::DropTemps(inner) = &expr.kind {
expr = inner;
}
expr
}
pub fn peel_blocks(&self) -> &Self {
let mut expr = self;
while let ExprKind::Block(Block { expr: Some(inner), .. }, _) = &expr.kind {
expr = inner;
}
expr
}
pub fn peel_borrows(&self) -> &Self {
let mut expr = self;
while let ExprKind::AddrOf(.., inner) = &expr.kind {
expr = inner;
}
expr
}
pub fn can_have_side_effects(&self) -> bool {
match self.peel_drop_temps().kind {
ExprKind::Path(_) | ExprKind::Lit(_) | ExprKind::OffsetOf(..) => false,
ExprKind::Type(base, _)
| ExprKind::Unary(_, base)
| ExprKind::Field(base, _)
| ExprKind::Index(base, _, _)
| ExprKind::AddrOf(.., base)
| ExprKind::Cast(base, _) => {
// This isn't exactly true for `Index` and all `Unary`, but we are using this
// method exclusively for diagnostics and there's a *cultural* pressure against
// them being used only for its side-effects.
base.can_have_side_effects()
}
ExprKind::Struct(_, fields, init) => fields
.iter()
.map(|field| field.expr)
.chain(init.into_iter())
.any(|e| e.can_have_side_effects()),
ExprKind::Array(args)
| ExprKind::Tup(args)
| ExprKind::Call(
Expr {
kind:
ExprKind::Path(QPath::Resolved(
None,
Path { res: Res::Def(DefKind::Ctor(_, CtorKind::Fn), _), .. },
)),
..
},
args,
) => args.iter().any(|arg| arg.can_have_side_effects()),
ExprKind::If(..)
| ExprKind::Match(..)
| ExprKind::MethodCall(..)
| ExprKind::Call(..)
| ExprKind::Closure { .. }
| ExprKind::Block(..)
| ExprKind::Repeat(..)
| ExprKind::Break(..)
| ExprKind::Continue(..)
| ExprKind::Ret(..)
| ExprKind::Become(..)
| ExprKind::Let(..)
| ExprKind::Loop(..)
| ExprKind::Assign(..)
| ExprKind::InlineAsm(..)
| ExprKind::AssignOp(..)
| ExprKind::ConstBlock(..)
| ExprKind::Binary(..)
| ExprKind::Yield(..)
| ExprKind::DropTemps(..)
| ExprKind::Err(_) => true,
}
}
/// To a first-order approximation, is this a pattern?
pub fn is_approximately_pattern(&self) -> bool {
match &self.kind {
ExprKind::Array(_)
| ExprKind::Call(..)
| ExprKind::Tup(_)
| ExprKind::Lit(_)
| ExprKind::Path(_)
| ExprKind::Struct(..) => true,
_ => false,
}
}
pub fn method_ident(&self) -> Option<Ident> {
match self.kind {
ExprKind::MethodCall(receiver_method, ..) => Some(receiver_method.ident),
ExprKind::Unary(_, expr) | ExprKind::AddrOf(.., expr) => expr.method_ident(),
_ => None,
}
}
}
/// Checks if the specified expression is a built-in range literal.
/// (See: `LoweringContext::lower_expr()`).
pub fn is_range_literal(expr: &Expr<'_>) -> bool {
match expr.kind {
// All built-in range literals but `..=` and `..` desugar to `Struct`s.
ExprKind::Struct(ref qpath, _, _) => matches!(
**qpath,
QPath::LangItem(
LangItem::Range
| LangItem::RangeTo
| LangItem::RangeFrom
| LangItem::RangeFull
| LangItem::RangeToInclusive,
..
)
),
// `..=` desugars into `::std::ops::RangeInclusive::new(...)`.
ExprKind::Call(ref func, _) => {
matches!(func.kind, ExprKind::Path(QPath::LangItem(LangItem::RangeInclusiveNew, ..)))
}
_ => false,
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum ExprKind<'hir> {
/// Allow anonymous constants from an inline `const` block
ConstBlock(ConstBlock),
/// An array (e.g., `[a, b, c, d]`).
Array(&'hir [Expr<'hir>]),
/// A function call.
///
/// The first field resolves to the function itself (usually an `ExprKind::Path`),
/// and the second field is the list of arguments.
/// This also represents calling the constructor of
/// tuple-like ADTs such as tuple structs and enum variants.
Call(&'hir Expr<'hir>, &'hir [Expr<'hir>]),
/// A method call (e.g., `x.foo::<'static, Bar, Baz>(a, b, c, d)`).
///
/// The `PathSegment` represents the method name and its generic arguments
/// (within the angle brackets).
/// The `&Expr` is the expression that evaluates
/// to the object on which the method is being called on (the receiver),
/// and the `&[Expr]` is the rest of the arguments.
/// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as
/// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, x, [a, b, c, d], span)`.
/// The final `Span` represents the span of the function and arguments
/// (e.g. `foo::<Bar, Baz>(a, b, c, d)` in `x.foo::<Bar, Baz>(a, b, c, d)`
///
/// To resolve the called method to a `DefId`, call [`type_dependent_def_id`] with
/// the `hir_id` of the `MethodCall` node itself.
///
/// [`type_dependent_def_id`]: ../../rustc_middle/ty/struct.TypeckResults.html#method.type_dependent_def_id
MethodCall(&'hir PathSegment<'hir>, &'hir Expr<'hir>, &'hir [Expr<'hir>], Span),
/// A tuple (e.g., `(a, b, c, d)`).
Tup(&'hir [Expr<'hir>]),
/// A binary operation (e.g., `a + b`, `a * b`).
Binary(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>),
/// A unary operation (e.g., `!x`, `*x`).
Unary(UnOp, &'hir Expr<'hir>),
/// A literal (e.g., `1`, `"foo"`).
Lit(&'hir Lit),
/// A cast (e.g., `foo as f64`).
Cast(&'hir Expr<'hir>, &'hir Ty<'hir>),
/// A type ascription (e.g., `x: Foo`). See RFC 3307.
Type(&'hir Expr<'hir>, &'hir Ty<'hir>),
/// Wraps the expression in a terminating scope.
/// This makes it semantically equivalent to `{ let _t = expr; _t }`.
///
/// This construct only exists to tweak the drop order in HIR lowering.
/// An example of that is the desugaring of `for` loops.
DropTemps(&'hir Expr<'hir>),
/// A `let $pat = $expr` expression.
///
/// These are not `Local` and only occur as expressions.
/// The `let Some(x) = foo()` in `if let Some(x) = foo()` is an example of `Let(..)`.
Let(&'hir Let<'hir>),
/// An `if` block, with an optional else block.
///
/// I.e., `if <expr> { <expr> } else { <expr> }`.
If(&'hir Expr<'hir>, &'hir Expr<'hir>, Option<&'hir Expr<'hir>>),
/// A conditionless loop (can be exited with `break`, `continue`, or `return`).
///
/// I.e., `'label: loop { <block> }`.
///
/// The `Span` is the loop header (`for x in y`/`while let pat = expr`).
Loop(&'hir Block<'hir>, Option<Label>, LoopSource, Span),
/// A `match` block, with a source that indicates whether or not it is
/// the result of a desugaring, and if so, which kind.
Match(&'hir Expr<'hir>, &'hir [Arm<'hir>], MatchSource),
/// A closure (e.g., `move |a, b, c| {a + b + c}`).
///
/// The `Span` is the argument block `|...|`.
///
/// This may also be a generator literal or an `async block` as indicated by the
/// `Option<Movability>`.
Closure(&'hir Closure<'hir>),
/// A block (e.g., `'label: { ... }`).
Block(&'hir Block<'hir>, Option<Label>),
/// An assignment (e.g., `a = foo()`).
Assign(&'hir Expr<'hir>, &'hir Expr<'hir>, Span),
/// An assignment with an operator.
///
/// E.g., `a += 1`.
AssignOp(BinOp, &'hir Expr<'hir>, &'hir Expr<'hir>),
/// Access of a named (e.g., `obj.foo`) or unnamed (e.g., `obj.0`) struct or tuple field.
Field(&'hir Expr<'hir>, Ident),
/// An indexing operation (`foo[2]`).
/// Similar to [`ExprKind::MethodCall`], the final `Span` represents the span of the brackets
/// and index.
Index(&'hir Expr<'hir>, &'hir Expr<'hir>, Span),
/// Path to a definition, possibly containing lifetime or type parameters.
Path(QPath<'hir>),
/// A referencing operation (i.e., `&a` or `&mut a`).
AddrOf(BorrowKind, Mutability, &'hir Expr<'hir>),
/// A `break`, with an optional label to break.
Break(Destination, Option<&'hir Expr<'hir>>),
/// A `continue`, with an optional label.
Continue(Destination),
/// A `return`, with an optional value to be returned.
Ret(Option<&'hir Expr<'hir>>),
/// A `become`, with the value to be returned.
Become(&'hir Expr<'hir>),
/// Inline assembly (from `asm!`), with its outputs and inputs.
InlineAsm(&'hir InlineAsm<'hir>),
/// Field offset (`offset_of!`)
OffsetOf(&'hir Ty<'hir>, &'hir [Ident]),
/// A struct or struct-like variant literal expression.
///
/// E.g., `Foo {x: 1, y: 2}`, or `Foo {x: 1, .. base}`,
/// where `base` is the `Option<Expr>`.
Struct(&'hir QPath<'hir>, &'hir [ExprField<'hir>], Option<&'hir Expr<'hir>>),
/// An array literal constructed from one repeated element.
///
/// E.g., `[1; 5]`. The first expression is the element
/// to be repeated; the second is the number of times to repeat it.
Repeat(&'hir Expr<'hir>, ArrayLen),
/// A suspension point for generators (i.e., `yield <expr>`).
Yield(&'hir Expr<'hir>, YieldSource),
/// A placeholder for an expression that wasn't syntactically well formed in some way.
Err(rustc_span::ErrorGuaranteed),
}
/// Represents an optionally `Self`-qualified value/type path or associated extension.
///
/// To resolve the path to a `DefId`, call [`qpath_res`].
///
/// [`qpath_res`]: ../../rustc_middle/ty/struct.TypeckResults.html#method.qpath_res
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum QPath<'hir> {
/// Path to a definition, optionally "fully-qualified" with a `Self`
/// type, if the path points to an associated item in a trait.
///
/// E.g., an unqualified path like `Clone::clone` has `None` for `Self`,
/// while `<Vec<T> as Clone>::clone` has `Some(Vec<T>)` for `Self`,
/// even though they both have the same two-segment `Clone::clone` `Path`.
Resolved(Option<&'hir Ty<'hir>>, &'hir Path<'hir>),
/// Type-related paths (e.g., `<T>::default` or `<T>::Output`).
/// Will be resolved by type-checking to an associated item.
///
/// UFCS source paths can desugar into this, with `Vec::new` turning into
/// `<Vec>::new`, and `T::X::Y::method` into `<<<T>::X>::Y>::method`,
/// the `X` and `Y` nodes each being a `TyKind::Path(QPath::TypeRelative(..))`.
TypeRelative(&'hir Ty<'hir>, &'hir PathSegment<'hir>),
/// Reference to a `#[lang = "foo"]` item. `HirId` of the inner expr.
LangItem(LangItem, Span, Option<HirId>),
}
impl<'hir> QPath<'hir> {
/// Returns the span of this `QPath`.
pub fn span(&self) -> Span {
match *self {
QPath::Resolved(_, path) => path.span,
QPath::TypeRelative(qself, ps) => qself.span.to(ps.ident.span),
QPath::LangItem(_, span, _) => span,
}
}
/// Returns the span of the qself of this `QPath`. For example, `()` in
/// `<() as Trait>::method`.
pub fn qself_span(&self) -> Span {
match *self {
QPath::Resolved(_, path) => path.span,
QPath::TypeRelative(qself, _) => qself.span,
QPath::LangItem(_, span, _) => span,
}
}
/// Returns the span of the last segment of this `QPath`. For example, `method` in
/// `<() as Trait>::method`.
pub fn last_segment_span(&self) -> Span {
match *self {
QPath::Resolved(_, path) => path.segments.last().unwrap().ident.span,
QPath::TypeRelative(_, segment) => segment.ident.span,
QPath::LangItem(_, span, _) => span,
}
}
}
/// Hints at the original code for a let statement.
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum LocalSource {
/// A `match _ { .. }`.
Normal,
/// When lowering async functions, we create locals within the `async move` so that
/// all parameters are dropped after the future is polled.
///
/// ```ignore (pseudo-Rust)
/// async fn foo(<pattern> @ x: Type) {
/// async move {
/// let <pattern> = x;
/// }
/// }
/// ```
AsyncFn,
/// A desugared `<expr>.await`.
AwaitDesugar,
/// A desugared `expr = expr`, where the LHS is a tuple, struct or array.
/// The span is that of the `=` sign.
AssignDesugar(Span),
}
/// Hints at the original code for a `match _ { .. }`.
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
#[derive(HashStable_Generic, Encodable, Decodable)]
pub enum MatchSource {
/// A `match _ { .. }`.
Normal,
/// A desugared `for _ in _ { .. }` loop.
ForLoopDesugar,
/// A desugared `?` operator.
TryDesugar(HirId),
/// A desugared `<expr>.await`.
AwaitDesugar,
/// A desugared `format_args!()`.
FormatArgs,
}
impl MatchSource {
#[inline]
pub const fn name(self) -> &'static str {
use MatchSource::*;
match self {
Normal => "match",
ForLoopDesugar => "for",
TryDesugar(_) => "?",
AwaitDesugar => ".await",
FormatArgs => "format_args!()",
}
}
}
/// The loop type that yielded an `ExprKind::Loop`.
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum LoopSource {
/// A `loop { .. }` loop.
Loop,
/// A `while _ { .. }` loop.
While,
/// A `for _ in _ { .. }` loop.
ForLoop,
}
impl LoopSource {
pub fn name(self) -> &'static str {
match self {
LoopSource::Loop => "loop",
LoopSource::While => "while",
LoopSource::ForLoop => "for",
}
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum LoopIdError {
OutsideLoopScope,
UnlabeledCfInWhileCondition,
UnresolvedLabel,
}
impl fmt::Display for LoopIdError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match self {
LoopIdError::OutsideLoopScope => "not inside loop scope",
LoopIdError::UnlabeledCfInWhileCondition => {
"unlabeled control flow (break or continue) in while condition"
}
LoopIdError::UnresolvedLabel => "label not found",
})
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct Destination {
/// This is `Some(_)` iff there is an explicit user-specified 'label
pub label: Option<Label>,
/// These errors are caught and then reported during the diagnostics pass in
/// `librustc_passes/loops.rs`
pub target_id: Result<HirId, LoopIdError>,
}
/// The yield kind that caused an `ExprKind::Yield`.
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum YieldSource {
/// An `<expr>.await`.
Await { expr: Option<HirId> },
/// A plain `yield`.
Yield,
}
impl YieldSource {
pub fn is_await(&self) -> bool {
matches!(self, YieldSource::Await { .. })
}
}
impl fmt::Display for YieldSource {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match self {
YieldSource::Await { .. } => "`await`",
YieldSource::Yield => "`yield`",
})
}
}
impl From<GeneratorKind> for YieldSource {
fn from(kind: GeneratorKind) -> Self {
match kind {
// Guess based on the kind of the current generator.
GeneratorKind::Gen => Self::Yield,
GeneratorKind::Async(_) => Self::Await { expr: None },
}
}
}
// N.B., if you change this, you'll probably want to change the corresponding
// type structure in middle/ty.rs as well.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct MutTy<'hir> {
pub ty: &'hir Ty<'hir>,
pub mutbl: Mutability,
}
/// Represents a function's signature in a trait declaration,
/// trait implementation, or a free function.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct FnSig<'hir> {
pub header: FnHeader,
pub decl: &'hir FnDecl<'hir>,
pub span: Span,
}
// The bodies for items are stored "out of line", in a separate
// hashmap in the `Crate`. Here we just record the hir-id of the item
// so it can fetched later.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
pub struct TraitItemId {
pub owner_id: OwnerId,
}
impl TraitItemId {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
}
/// Represents an item declaration within a trait declaration,
/// possibly including a default implementation. A trait item is
/// either required (meaning it doesn't have an implementation, just a
/// signature) or provided (meaning it has a default implementation).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct TraitItem<'hir> {
pub ident: Ident,
pub owner_id: OwnerId,
pub generics: &'hir Generics<'hir>,
pub kind: TraitItemKind<'hir>,
pub span: Span,
pub defaultness: Defaultness,
}
impl<'hir> TraitItem<'hir> {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
pub fn trait_item_id(&self) -> TraitItemId {
TraitItemId { owner_id: self.owner_id }
}
/// Expect an [`TraitItemKind::Const`] or panic.
#[track_caller]
pub fn expect_const(&self) -> (&'hir Ty<'hir>, Option<BodyId>) {
let TraitItemKind::Const(ty, body) = self.kind else { self.expect_failed("a constant") };
(ty, body)
}
/// Expect an [`TraitItemKind::Fn`] or panic.
#[track_caller]
pub fn expect_fn(&self) -> (&FnSig<'hir>, &TraitFn<'hir>) {
let TraitItemKind::Fn(ty, trfn) = &self.kind else { self.expect_failed("a function") };
(ty, trfn)
}
/// Expect an [`TraitItemKind::Type`] or panic.
#[track_caller]
pub fn expect_type(&self) -> (GenericBounds<'hir>, Option<&'hir Ty<'hir>>) {
let TraitItemKind::Type(bounds, ty) = self.kind else { self.expect_failed("a type") };
(bounds, ty)
}
#[track_caller]
fn expect_failed(&self, expected: &'static str) -> ! {
panic!("expected {expected} item, found {self:?}")
}
}
/// Represents a trait method's body (or just argument names).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum TraitFn<'hir> {
/// No default body in the trait, just a signature.
Required(&'hir [Ident]),
/// Both signature and body are provided in the trait.
Provided(BodyId),
}
/// Represents a trait method or associated constant or type
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum TraitItemKind<'hir> {
/// An associated constant with an optional value (otherwise `impl`s must contain a value).
Const(&'hir Ty<'hir>, Option<BodyId>),
/// An associated function with an optional body.
Fn(FnSig<'hir>, TraitFn<'hir>),
/// An associated type with (possibly empty) bounds and optional concrete
/// type.
Type(GenericBounds<'hir>, Option<&'hir Ty<'hir>>),
}
// The bodies for items are stored "out of line", in a separate
// hashmap in the `Crate`. Here we just record the hir-id of the item
// so it can fetched later.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
pub struct ImplItemId {
pub owner_id: OwnerId,
}
impl ImplItemId {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
}
/// Represents anything within an `impl` block.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct ImplItem<'hir> {
pub ident: Ident,
pub owner_id: OwnerId,
pub generics: &'hir Generics<'hir>,
pub kind: ImplItemKind<'hir>,
pub defaultness: Defaultness,
pub span: Span,
pub vis_span: Span,
}
impl<'hir> ImplItem<'hir> {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
pub fn impl_item_id(&self) -> ImplItemId {
ImplItemId { owner_id: self.owner_id }
}
/// Expect an [`ImplItemKind::Const`] or panic.
#[track_caller]
pub fn expect_const(&self) -> (&'hir Ty<'hir>, BodyId) {
let ImplItemKind::Const(ty, body) = self.kind else { self.expect_failed("a constant") };
(ty, body)
}
/// Expect an [`ImplItemKind::Fn`] or panic.
#[track_caller]
pub fn expect_fn(&self) -> (&FnSig<'hir>, BodyId) {
let ImplItemKind::Fn(ty, body) = &self.kind else { self.expect_failed("a function") };
(ty, *body)
}
/// Expect an [`ImplItemKind::Type`] or panic.
#[track_caller]
pub fn expect_type(&self) -> &'hir Ty<'hir> {
let ImplItemKind::Type(ty) = self.kind else { self.expect_failed("a type") };
ty
}
#[track_caller]
fn expect_failed(&self, expected: &'static str) -> ! {
panic!("expected {expected} item, found {self:?}")
}
}
/// Represents various kinds of content within an `impl`.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum ImplItemKind<'hir> {
/// An associated constant of the given type, set to the constant result
/// of the expression.
Const(&'hir Ty<'hir>, BodyId),
/// An associated function implementation with the given signature and body.
Fn(FnSig<'hir>, BodyId),
/// An associated type.
Type(&'hir Ty<'hir>),
}
/// The name of the associated type for `Fn` return types.
pub const FN_OUTPUT_NAME: Symbol = sym::Output;
/// Bind a type to an associated type (i.e., `A = Foo`).
///
/// Bindings like `A: Debug` are represented as a special type `A =
/// $::Debug` that is understood by the astconv code.
///
/// FIXME(alexreg): why have a separate type for the binding case,
/// wouldn't it be better to make the `ty` field an enum like the
/// following?
///
/// ```ignore (pseudo-rust)
/// enum TypeBindingKind {
/// Equals(...),
/// Binding(...),
/// }
/// ```
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct TypeBinding<'hir> {
pub hir_id: HirId,
pub ident: Ident,
pub gen_args: &'hir GenericArgs<'hir>,
pub kind: TypeBindingKind<'hir>,
pub span: Span,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum Term<'hir> {
Ty(&'hir Ty<'hir>),
Const(AnonConst),
}
impl<'hir> From<&'hir Ty<'hir>> for Term<'hir> {
fn from(ty: &'hir Ty<'hir>) -> Self {
Term::Ty(ty)
}
}
impl<'hir> From<AnonConst> for Term<'hir> {
fn from(c: AnonConst) -> Self {
Term::Const(c)
}
}
// Represents the two kinds of type bindings.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum TypeBindingKind<'hir> {
/// E.g., `Foo<Bar: Send>`.
Constraint { bounds: &'hir [GenericBound<'hir>] },
/// E.g., `Foo<Bar = ()>`, `Foo<Bar = ()>`
Equality { term: Term<'hir> },
}
impl TypeBinding<'_> {
pub fn ty(&self) -> &Ty<'_> {
match self.kind {
TypeBindingKind::Equality { term: Term::Ty(ref ty) } => ty,
_ => panic!("expected equality type binding for parenthesized generic args"),
}
}
pub fn opt_const(&self) -> Option<&'_ AnonConst> {
match self.kind {
TypeBindingKind::Equality { term: Term::Const(ref c) } => Some(c),
_ => None,
}
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Ty<'hir> {
pub hir_id: HirId,
pub kind: TyKind<'hir>,
pub span: Span,
}
impl<'hir> Ty<'hir> {
/// Returns `true` if `param_def_id` matches the `bounded_ty` of this predicate.
pub fn as_generic_param(&self) -> Option<(DefId, Ident)> {
let TyKind::Path(QPath::Resolved(None, path)) = self.kind else {
return None;
};
let [segment] = &path.segments else {
return None;
};
match path.res {
Res::Def(DefKind::TyParam, def_id) | Res::SelfTyParam { trait_: def_id } => {
Some((def_id, segment.ident))
}
_ => None,
}
}
pub fn peel_refs(&self) -> &Self {
let mut final_ty = self;
while let TyKind::Ref(_, MutTy { ty, .. }) = &final_ty.kind {
final_ty = ty;
}
final_ty
}
pub fn find_self_aliases(&self) -> Vec<Span> {
use crate::intravisit::Visitor;
struct MyVisitor(Vec<Span>);
impl<'v> Visitor<'v> for MyVisitor {
fn visit_ty(&mut self, t: &'v Ty<'v>) {
if matches!(
&t.kind,
TyKind::Path(QPath::Resolved(
_,
Path { res: crate::def::Res::SelfTyAlias { .. }, .. },
))
) {
self.0.push(t.span);
return;
}
crate::intravisit::walk_ty(self, t);
}
}
let mut my_visitor = MyVisitor(vec![]);
my_visitor.visit_ty(self);
my_visitor.0
}
}
/// Not represented directly in the AST; referred to by name through a `ty_path`.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Hash, Debug)]
#[derive(HashStable_Generic)]
pub enum PrimTy {
Int(IntTy),
Uint(UintTy),
Float(FloatTy),
Str,
Bool,
Char,
}
impl PrimTy {
/// All of the primitive types
pub const ALL: [Self; 17] = [
// any changes here should also be reflected in `PrimTy::from_name`
Self::Int(IntTy::I8),
Self::Int(IntTy::I16),
Self::Int(IntTy::I32),
Self::Int(IntTy::I64),
Self::Int(IntTy::I128),
Self::Int(IntTy::Isize),
Self::Uint(UintTy::U8),
Self::Uint(UintTy::U16),
Self::Uint(UintTy::U32),
Self::Uint(UintTy::U64),
Self::Uint(UintTy::U128),
Self::Uint(UintTy::Usize),
Self::Float(FloatTy::F32),
Self::Float(FloatTy::F64),
Self::Bool,
Self::Char,
Self::Str,
];
/// Like [`PrimTy::name`], but returns a &str instead of a symbol.
///
/// Used by clippy.
pub fn name_str(self) -> &'static str {
match self {
PrimTy::Int(i) => i.name_str(),
PrimTy::Uint(u) => u.name_str(),
PrimTy::Float(f) => f.name_str(),
PrimTy::Str => "str",
PrimTy::Bool => "bool",
PrimTy::Char => "char",
}
}
pub fn name(self) -> Symbol {
match self {
PrimTy::Int(i) => i.name(),
PrimTy::Uint(u) => u.name(),
PrimTy::Float(f) => f.name(),
PrimTy::Str => sym::str,
PrimTy::Bool => sym::bool,
PrimTy::Char => sym::char,
}
}
/// Returns the matching `PrimTy` for a `Symbol` such as "str" or "i32".
/// Returns `None` if no matching type is found.
pub fn from_name(name: Symbol) -> Option<Self> {
let ty = match name {
// any changes here should also be reflected in `PrimTy::ALL`
sym::i8 => Self::Int(IntTy::I8),
sym::i16 => Self::Int(IntTy::I16),
sym::i32 => Self::Int(IntTy::I32),
sym::i64 => Self::Int(IntTy::I64),
sym::i128 => Self::Int(IntTy::I128),
sym::isize => Self::Int(IntTy::Isize),
sym::u8 => Self::Uint(UintTy::U8),
sym::u16 => Self::Uint(UintTy::U16),
sym::u32 => Self::Uint(UintTy::U32),
sym::u64 => Self::Uint(UintTy::U64),
sym::u128 => Self::Uint(UintTy::U128),
sym::usize => Self::Uint(UintTy::Usize),
sym::f32 => Self::Float(FloatTy::F32),
sym::f64 => Self::Float(FloatTy::F64),
sym::bool => Self::Bool,
sym::char => Self::Char,
sym::str => Self::Str,
_ => return None,
};
Some(ty)
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct BareFnTy<'hir> {
pub unsafety: Unsafety,
pub abi: Abi,
pub generic_params: &'hir [GenericParam<'hir>],
pub decl: &'hir FnDecl<'hir>,
pub param_names: &'hir [Ident],
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct OpaqueTy<'hir> {
pub generics: &'hir Generics<'hir>,
pub bounds: GenericBounds<'hir>,
pub origin: OpaqueTyOrigin,
/// Return-position impl traits (and async futures) must "reify" any late-bound
/// lifetimes that are captured from the function signature they originate from.
///
/// This is done by generating a new early-bound lifetime parameter local to the
/// opaque which is substituted in the function signature with the late-bound
/// lifetime.
///
/// This mapping associated a captured lifetime (first parameter) with the new
/// early-bound lifetime that was generated for the opaque.
pub lifetime_mapping: &'hir [(&'hir Lifetime, LocalDefId)],
/// Whether the opaque is a return-position impl trait (or async future)
/// originating from a trait method. This makes it so that the opaque is
/// lowered as an associated type.
pub in_trait: bool,
}
/// From whence the opaque type came.
#[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable_Generic)]
pub enum OpaqueTyOrigin {
/// `-> impl Trait`
FnReturn(LocalDefId),
/// `async fn`
AsyncFn(LocalDefId),
/// type aliases: `type Foo = impl Trait;`
TyAlias {
/// associated types in impl blocks for traits.
in_assoc_ty: bool,
},
}
/// The various kinds of types recognized by the compiler.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum TyKind<'hir> {
/// A variable length slice (i.e., `[T]`).
Slice(&'hir Ty<'hir>),
/// A fixed length array (i.e., `[T; n]`).
Array(&'hir Ty<'hir>, ArrayLen),
/// A raw pointer (i.e., `*const T` or `*mut T`).
Ptr(MutTy<'hir>),
/// A reference (i.e., `&'a T` or `&'a mut T`).
Ref(&'hir Lifetime, MutTy<'hir>),
/// A bare function (e.g., `fn(usize) -> bool`).
BareFn(&'hir BareFnTy<'hir>),
/// The never type (`!`).
Never,
/// A tuple (`(A, B, C, D, ...)`).
Tup(&'hir [Ty<'hir>]),
/// A path to a type definition (`module::module::...::Type`), or an
/// associated type (e.g., `<Vec<T> as Trait>::Type` or `<T>::Target`).
///
/// Type parameters may be stored in each `PathSegment`.
Path(QPath<'hir>),
/// An opaque type definition itself. This is only used for `impl Trait`.
///
/// The generic argument list contains the lifetimes (and in the future
/// possibly parameters) that are actually bound on the `impl Trait`.
///
/// The last parameter specifies whether this opaque appears in a trait definition.
OpaqueDef(ItemId, &'hir [GenericArg<'hir>], bool),
/// A trait object type `Bound1 + Bound2 + Bound3`
/// where `Bound` is a trait or a lifetime.
TraitObject(&'hir [PolyTraitRef<'hir>], &'hir Lifetime, TraitObjectSyntax),
/// Unused for now.
Typeof(AnonConst),
/// `TyKind::Infer` means the type should be inferred instead of it having been
/// specified. This can appear anywhere in a type.
Infer,
/// Placeholder for a type that has failed to be defined.
Err(rustc_span::ErrorGuaranteed),
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum InlineAsmOperand<'hir> {
In {
reg: InlineAsmRegOrRegClass,
expr: &'hir Expr<'hir>,
},
Out {
reg: InlineAsmRegOrRegClass,
late: bool,
expr: Option<&'hir Expr<'hir>>,
},
InOut {
reg: InlineAsmRegOrRegClass,
late: bool,
expr: &'hir Expr<'hir>,
},
SplitInOut {
reg: InlineAsmRegOrRegClass,
late: bool,
in_expr: &'hir Expr<'hir>,
out_expr: Option<&'hir Expr<'hir>>,
},
Const {
anon_const: AnonConst,
},
SymFn {
anon_const: AnonConst,
},
SymStatic {
path: QPath<'hir>,
def_id: DefId,
},
}
impl<'hir> InlineAsmOperand<'hir> {
pub fn reg(&self) -> Option<InlineAsmRegOrRegClass> {
match *self {
Self::In { reg, .. }
| Self::Out { reg, .. }
| Self::InOut { reg, .. }
| Self::SplitInOut { reg, .. } => Some(reg),
Self::Const { .. } | Self::SymFn { .. } | Self::SymStatic { .. } => None,
}
}
pub fn is_clobber(&self) -> bool {
matches!(
self,
InlineAsmOperand::Out { reg: InlineAsmRegOrRegClass::Reg(_), late: _, expr: None }
)
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct InlineAsm<'hir> {
pub template: &'hir [InlineAsmTemplatePiece],
pub template_strs: &'hir [(Symbol, Option<Symbol>, Span)],
pub operands: &'hir [(InlineAsmOperand<'hir>, Span)],
pub options: InlineAsmOptions,
pub line_spans: &'hir [Span],
}
/// Represents a parameter in a function header.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Param<'hir> {
pub hir_id: HirId,
pub pat: &'hir Pat<'hir>,
pub ty_span: Span,
pub span: Span,
}
/// Represents the header (not the body) of a function declaration.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct FnDecl<'hir> {
/// The types of the function's parameters.
///
/// Additional argument data is stored in the function's [body](Body::params).
pub inputs: &'hir [Ty<'hir>],
pub output: FnRetTy<'hir>,
pub c_variadic: bool,
/// Does the function have an implicit self?
pub implicit_self: ImplicitSelfKind,
/// Is lifetime elision allowed.
pub lifetime_elision_allowed: bool,
}
/// Represents what type of implicit self a function has, if any.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
pub enum ImplicitSelfKind {
/// Represents a `fn x(self);`.
Imm,
/// Represents a `fn x(mut self);`.
Mut,
/// Represents a `fn x(&self);`.
ImmRef,
/// Represents a `fn x(&mut self);`.
MutRef,
/// Represents when a function does not have a self argument or
/// when a function has a `self: X` argument.
None,
}
impl ImplicitSelfKind {
/// Does this represent an implicit self?
pub fn has_implicit_self(&self) -> bool {
!matches!(*self, ImplicitSelfKind::None)
}
}
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug)]
#[derive(HashStable_Generic)]
pub enum IsAsync {
Async(Span),
NotAsync,
}
impl IsAsync {
pub fn is_async(self) -> bool {
matches!(self, IsAsync::Async(_))
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, Encodable, Decodable, HashStable_Generic)]
pub enum Defaultness {
Default { has_value: bool },
Final,
}
impl Defaultness {
pub fn has_value(&self) -> bool {
match *self {
Defaultness::Default { has_value } => has_value,
Defaultness::Final => true,
}
}
pub fn is_final(&self) -> bool {
*self == Defaultness::Final
}
pub fn is_default(&self) -> bool {
matches!(*self, Defaultness::Default { .. })
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum FnRetTy<'hir> {
/// Return type is not specified.
///
/// Functions default to `()` and
/// closures default to inference. Span points to where return
/// type would be inserted.
DefaultReturn(Span),
/// Everything else.
Return(&'hir Ty<'hir>),
}
impl FnRetTy<'_> {
#[inline]
pub fn span(&self) -> Span {
match *self {
Self::DefaultReturn(span) => span,
Self::Return(ref ty) => ty.span,
}
}
}
/// Represents `for<...>` binder before a closure
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum ClosureBinder {
/// Binder is not specified.
Default,
/// Binder is specified.
///
/// Span points to the whole `for<...>`.
For { span: Span },
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Mod<'hir> {
pub spans: ModSpans,
pub item_ids: &'hir [ItemId],
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct ModSpans {
/// A span from the first token past `{` to the last token until `}`.
/// For `mod foo;`, the inner span ranges from the first token
/// to the last token in the external file.
pub inner_span: Span,
pub inject_use_span: Span,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct EnumDef<'hir> {
pub variants: &'hir [Variant<'hir>],
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Variant<'hir> {
/// Name of the variant.
pub ident: Ident,
/// Id of the variant (not the constructor, see `VariantData::ctor_hir_id()`).
pub hir_id: HirId,
pub def_id: LocalDefId,
/// Fields and constructor id of the variant.
pub data: VariantData<'hir>,
/// Explicit discriminant (e.g., `Foo = 1`).
pub disr_expr: Option<AnonConst>,
/// Span
pub span: Span,
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum UseKind {
/// One import, e.g., `use foo::bar` or `use foo::bar as baz`.
/// Also produced for each element of a list `use`, e.g.
/// `use foo::{a, b}` lowers to `use foo::a; use foo::b;`.
Single,
/// Glob import, e.g., `use foo::*`.
Glob,
/// Degenerate list import, e.g., `use foo::{a, b}` produces
/// an additional `use foo::{}` for performing checks such as
/// unstable feature gating. May be removed in the future.
ListStem,
}
/// References to traits in impls.
///
/// `resolve` maps each `TraitRef`'s `ref_id` to its defining trait; that's all
/// that the `ref_id` is for. Note that `ref_id`'s value is not the `HirId` of the
/// trait being referred to but just a unique `HirId` that serves as a key
/// within the resolution map.
#[derive(Clone, Debug, Copy, HashStable_Generic)]
pub struct TraitRef<'hir> {
pub path: &'hir Path<'hir>,
// Don't hash the `ref_id`. It is tracked via the thing it is used to access.
#[stable_hasher(ignore)]
pub hir_ref_id: HirId,
}
impl TraitRef<'_> {
/// Gets the `DefId` of the referenced trait. It _must_ actually be a trait or trait alias.
pub fn trait_def_id(&self) -> Option<DefId> {
match self.path.res {
Res::Def(DefKind::Trait | DefKind::TraitAlias, did) => Some(did),
Res::Err => None,
_ => unreachable!(),
}
}
}
#[derive(Clone, Debug, Copy, HashStable_Generic)]
pub struct PolyTraitRef<'hir> {
/// The `'a` in `for<'a> Foo<&'a T>`.
pub bound_generic_params: &'hir [GenericParam<'hir>],
/// The `Foo<&'a T>` in `for<'a> Foo<&'a T>`.
pub trait_ref: TraitRef<'hir>,
pub span: Span,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct FieldDef<'hir> {
pub span: Span,
pub vis_span: Span,
pub ident: Ident,
pub hir_id: HirId,
pub def_id: LocalDefId,
pub ty: &'hir Ty<'hir>,
}
impl FieldDef<'_> {
// Still necessary in couple of places
pub fn is_positional(&self) -> bool {
self.ident.as_str().as_bytes()[0].is_ascii_digit()
}
}
/// Fields and constructor IDs of enum variants and structs.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum VariantData<'hir> {
/// A struct variant.
///
/// E.g., `Bar { .. }` as in `enum Foo { Bar { .. } }`.
Struct(&'hir [FieldDef<'hir>], /* recovered */ bool),
/// A tuple variant.
///
/// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`.
Tuple(&'hir [FieldDef<'hir>], HirId, LocalDefId),
/// A unit variant.
///
/// E.g., `Bar = ..` as in `enum Foo { Bar = .. }`.
Unit(HirId, LocalDefId),
}
impl<'hir> VariantData<'hir> {
/// Return the fields of this variant.
pub fn fields(&self) -> &'hir [FieldDef<'hir>] {
match *self {
VariantData::Struct(ref fields, ..) | VariantData::Tuple(ref fields, ..) => fields,
_ => &[],
}
}
pub fn ctor(&self) -> Option<(CtorKind, HirId, LocalDefId)> {
match *self {
VariantData::Tuple(_, hir_id, def_id) => Some((CtorKind::Fn, hir_id, def_id)),
VariantData::Unit(hir_id, def_id) => Some((CtorKind::Const, hir_id, def_id)),
VariantData::Struct(..) => None,
}
}
#[inline]
pub fn ctor_kind(&self) -> Option<CtorKind> {
self.ctor().map(|(kind, ..)| kind)
}
/// Return the `HirId` of this variant's constructor, if it has one.
#[inline]
pub fn ctor_hir_id(&self) -> Option<HirId> {
self.ctor().map(|(_, hir_id, _)| hir_id)
}
/// Return the `LocalDefId` of this variant's constructor, if it has one.
#[inline]
pub fn ctor_def_id(&self) -> Option<LocalDefId> {
self.ctor().map(|(.., def_id)| def_id)
}
}
// The bodies for items are stored "out of line", in a separate
// hashmap in the `Crate`. Here we just record the hir-id of the item
// so it can fetched later.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, Hash, HashStable_Generic)]
pub struct ItemId {
pub owner_id: OwnerId,
}
impl ItemId {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
}
/// An item
///
/// The name might be a dummy name in case of anonymous items
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Item<'hir> {
pub ident: Ident,
pub owner_id: OwnerId,
pub kind: ItemKind<'hir>,
pub span: Span,
pub vis_span: Span,
}
impl<'hir> Item<'hir> {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
pub fn item_id(&self) -> ItemId {
ItemId { owner_id: self.owner_id }
}
/// Expect an [`ItemKind::ExternCrate`] or panic.
#[track_caller]
pub fn expect_extern_crate(&self) -> Option<Symbol> {
let ItemKind::ExternCrate(s) = self.kind else { self.expect_failed("an extern crate") };
s
}
/// Expect an [`ItemKind::Use`] or panic.
#[track_caller]
pub fn expect_use(&self) -> (&'hir UsePath<'hir>, UseKind) {
let ItemKind::Use(p, uk) = self.kind else { self.expect_failed("a use") };
(p, uk)
}
/// Expect an [`ItemKind::Static`] or panic.
#[track_caller]
pub fn expect_static(&self) -> (&'hir Ty<'hir>, Mutability, BodyId) {
let ItemKind::Static(ty, mutbl, body) = self.kind else { self.expect_failed("a static") };
(ty, mutbl, body)
}
/// Expect an [`ItemKind::Const`] or panic.
#[track_caller]
pub fn expect_const(&self) -> (&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId) {
let ItemKind::Const(ty, gen, body) = self.kind else { self.expect_failed("a constant") };
(ty, gen, body)
}
/// Expect an [`ItemKind::Fn`] or panic.
#[track_caller]
pub fn expect_fn(&self) -> (&FnSig<'hir>, &'hir Generics<'hir>, BodyId) {
let ItemKind::Fn(sig, gen, body) = &self.kind else { self.expect_failed("a function") };
(sig, gen, *body)
}
/// Expect an [`ItemKind::Macro`] or panic.
#[track_caller]
pub fn expect_macro(&self) -> (&ast::MacroDef, MacroKind) {
let ItemKind::Macro(def, mk) = &self.kind else { self.expect_failed("a macro") };
(def, *mk)
}
/// Expect an [`ItemKind::Mod`] or panic.
#[track_caller]
pub fn expect_mod(&self) -> &'hir Mod<'hir> {
let ItemKind::Mod(m) = self.kind else { self.expect_failed("a module") };
m
}
/// Expect an [`ItemKind::ForeignMod`] or panic.
#[track_caller]
pub fn expect_foreign_mod(&self) -> (Abi, &'hir [ForeignItemRef]) {
let ItemKind::ForeignMod { abi, items } = self.kind else {
self.expect_failed("a foreign module")
};
(abi, items)
}
/// Expect an [`ItemKind::GlobalAsm`] or panic.
#[track_caller]
pub fn expect_global_asm(&self) -> &'hir InlineAsm<'hir> {
let ItemKind::GlobalAsm(asm) = self.kind else { self.expect_failed("a global asm") };
asm
}
/// Expect an [`ItemKind::TyAlias`] or panic.
#[track_caller]
pub fn expect_ty_alias(&self) -> (&'hir Ty<'hir>, &'hir Generics<'hir>) {
let ItemKind::TyAlias(ty, gen) = self.kind else { self.expect_failed("a type alias") };
(ty, gen)
}
/// Expect an [`ItemKind::OpaqueTy`] or panic.
#[track_caller]
pub fn expect_opaque_ty(&self) -> &OpaqueTy<'hir> {
let ItemKind::OpaqueTy(ty) = &self.kind else { self.expect_failed("an opaque type") };
ty
}
/// Expect an [`ItemKind::Enum`] or panic.
#[track_caller]
pub fn expect_enum(&self) -> (&EnumDef<'hir>, &'hir Generics<'hir>) {
let ItemKind::Enum(def, gen) = &self.kind else { self.expect_failed("an enum") };
(def, gen)
}
/// Expect an [`ItemKind::Struct`] or panic.
#[track_caller]
pub fn expect_struct(&self) -> (&VariantData<'hir>, &'hir Generics<'hir>) {
let ItemKind::Struct(data, gen) = &self.kind else { self.expect_failed("a struct") };
(data, gen)
}
/// Expect an [`ItemKind::Union`] or panic.
#[track_caller]
pub fn expect_union(&self) -> (&VariantData<'hir>, &'hir Generics<'hir>) {
let ItemKind::Union(data, gen) = &self.kind else { self.expect_failed("a union") };
(data, gen)
}
/// Expect an [`ItemKind::Trait`] or panic.
#[track_caller]
pub fn expect_trait(
self,
) -> (IsAuto, Unsafety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]) {
let ItemKind::Trait(is_auto, unsafety, gen, bounds, items) = self.kind else {
self.expect_failed("a trait")
};
(is_auto, unsafety, gen, bounds, items)
}
/// Expect an [`ItemKind::TraitAlias`] or panic.
#[track_caller]
pub fn expect_trait_alias(&self) -> (&'hir Generics<'hir>, GenericBounds<'hir>) {
let ItemKind::TraitAlias(gen, bounds) = self.kind else {
self.expect_failed("a trait alias")
};
(gen, bounds)
}
/// Expect an [`ItemKind::Impl`] or panic.
#[track_caller]
pub fn expect_impl(&self) -> &'hir Impl<'hir> {
let ItemKind::Impl(imp) = self.kind else { self.expect_failed("an impl") };
imp
}
#[track_caller]
fn expect_failed(&self, expected: &'static str) -> ! {
panic!("expected {expected} item, found {self:?}")
}
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
#[derive(Encodable, Decodable, HashStable_Generic)]
pub enum Unsafety {
Unsafe,
Normal,
}
impl Unsafety {
pub fn prefix_str(&self) -> &'static str {
match self {
Self::Unsafe => "unsafe ",
Self::Normal => "",
}
}
}
impl fmt::Display for Unsafety {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match *self {
Self::Unsafe => "unsafe",
Self::Normal => "normal",
})
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[derive(Encodable, Decodable, HashStable_Generic)]
pub enum Constness {
Const,
NotConst,
}
impl fmt::Display for Constness {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(match *self {
Self::Const => "const",
Self::NotConst => "non-const",
})
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub struct FnHeader {
pub unsafety: Unsafety,
pub constness: Constness,
pub asyncness: IsAsync,
pub abi: Abi,
}
impl FnHeader {
pub fn is_async(&self) -> bool {
matches!(&self.asyncness, IsAsync::Async(_))
}
pub fn is_const(&self) -> bool {
matches!(&self.constness, Constness::Const)
}
pub fn is_unsafe(&self) -> bool {
matches!(&self.unsafety, Unsafety::Unsafe)
}
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum ItemKind<'hir> {
/// An `extern crate` item, with optional *original* crate name if the crate was renamed.
///
/// E.g., `extern crate foo` or `extern crate foo_bar as foo`.
ExternCrate(Option<Symbol>),
/// `use foo::bar::*;` or `use foo::bar::baz as quux;`
///
/// or just
///
/// `use foo::bar::baz;` (with `as baz` implicitly on the right).
Use(&'hir UsePath<'hir>, UseKind),
/// A `static` item.
Static(&'hir Ty<'hir>, Mutability, BodyId),
/// A `const` item.
Const(&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId),
/// A function declaration.
Fn(FnSig<'hir>, &'hir Generics<'hir>, BodyId),
/// A MBE macro definition (`macro_rules!` or `macro`).
Macro(&'hir ast::MacroDef, MacroKind),
/// A module.
Mod(&'hir Mod<'hir>),
/// An external module, e.g. `extern { .. }`.
ForeignMod { abi: Abi, items: &'hir [ForeignItemRef] },
/// Module-level inline assembly (from `global_asm!`).
GlobalAsm(&'hir InlineAsm<'hir>),
/// A type alias, e.g., `type Foo = Bar<u8>`.
TyAlias(&'hir Ty<'hir>, &'hir Generics<'hir>),
/// An opaque `impl Trait` type alias, e.g., `type Foo = impl Bar;`.
OpaqueTy(&'hir OpaqueTy<'hir>),
/// An enum definition, e.g., `enum Foo<A, B> {C<A>, D<B>}`.
Enum(EnumDef<'hir>, &'hir Generics<'hir>),
/// A struct definition, e.g., `struct Foo<A> {x: A}`.
Struct(VariantData<'hir>, &'hir Generics<'hir>),
/// A union definition, e.g., `union Foo<A, B> {x: A, y: B}`.
Union(VariantData<'hir>, &'hir Generics<'hir>),
/// A trait definition.
Trait(IsAuto, Unsafety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]),
/// A trait alias.
TraitAlias(&'hir Generics<'hir>, GenericBounds<'hir>),
/// An implementation, e.g., `impl<A> Trait for Foo { .. }`.
Impl(&'hir Impl<'hir>),
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct Impl<'hir> {
pub unsafety: Unsafety,
pub polarity: ImplPolarity,
pub defaultness: Defaultness,
// We do not put a `Span` in `Defaultness` because it breaks foreign crate metadata
// decoding as `Span`s cannot be decoded when a `Session` is not available.
pub defaultness_span: Option<Span>,
pub generics: &'hir Generics<'hir>,
/// The trait being implemented, if any.
pub of_trait: Option<TraitRef<'hir>>,
pub self_ty: &'hir Ty<'hir>,
pub items: &'hir [ImplItemRef],
}
impl ItemKind<'_> {
pub fn generics(&self) -> Option<&Generics<'_>> {
Some(match *self {
ItemKind::Fn(_, ref generics, _)
| ItemKind::TyAlias(_, ref generics)
| ItemKind::Const(_, ref generics, _)
| ItemKind::OpaqueTy(OpaqueTy { ref generics, .. })
| ItemKind::Enum(_, ref generics)
| ItemKind::Struct(_, ref generics)
| ItemKind::Union(_, ref generics)
| ItemKind::Trait(_, _, ref generics, _, _)
| ItemKind::TraitAlias(ref generics, _)
| ItemKind::Impl(Impl { ref generics, .. }) => generics,
_ => return None,
})
}
pub fn descr(&self) -> &'static str {
match self {
ItemKind::ExternCrate(..) => "extern crate",
ItemKind::Use(..) => "`use` import",
ItemKind::Static(..) => "static item",
ItemKind::Const(..) => "constant item",
ItemKind::Fn(..) => "function",
ItemKind::Macro(..) => "macro",
ItemKind::Mod(..) => "module",
ItemKind::ForeignMod { .. } => "extern block",
ItemKind::GlobalAsm(..) => "global asm item",
ItemKind::TyAlias(..) => "type alias",
ItemKind::OpaqueTy(..) => "opaque type",
ItemKind::Enum(..) => "enum",
ItemKind::Struct(..) => "struct",
ItemKind::Union(..) => "union",
ItemKind::Trait(..) => "trait",
ItemKind::TraitAlias(..) => "trait alias",
ItemKind::Impl(..) => "implementation",
}
}
}
/// A reference from an trait to one of its associated items. This
/// contains the item's id, naturally, but also the item's name and
/// some other high-level details (like whether it is an associated
/// type or method, and whether it is public). This allows other
/// passes to find the impl they want without loading the ID (which
/// means fewer edges in the incremental compilation graph).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct TraitItemRef {
pub id: TraitItemId,
pub ident: Ident,
pub kind: AssocItemKind,
pub span: Span,
}
/// A reference from an impl to one of its associated items. This
/// contains the item's ID, naturally, but also the item's name and
/// some other high-level details (like whether it is an associated
/// type or method, and whether it is public). This allows other
/// passes to find the impl they want without loading the ID (which
/// means fewer edges in the incremental compilation graph).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct ImplItemRef {
pub id: ImplItemId,
pub ident: Ident,
pub kind: AssocItemKind,
pub span: Span,
/// When we are in a trait impl, link to the trait-item's id.
pub trait_item_def_id: Option<DefId>,
}
#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
pub enum AssocItemKind {
Const,
Fn { has_self: bool },
Type,
}
// The bodies for items are stored "out of line", in a separate
// hashmap in the `Crate`. Here we just record the hir-id of the item
// so it can fetched later.
#[derive(Copy, Clone, PartialEq, Eq, Encodable, Decodable, Debug, HashStable_Generic)]
pub struct ForeignItemId {
pub owner_id: OwnerId,
}
impl ForeignItemId {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
}
/// A reference from a foreign block to one of its items. This
/// contains the item's ID, naturally, but also the item's name and
/// some other high-level details (like whether it is an associated
/// type or method, and whether it is public). This allows other
/// passes to find the impl they want without loading the ID (which
/// means fewer edges in the incremental compilation graph).
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct ForeignItemRef {
pub id: ForeignItemId,
pub ident: Ident,
pub span: Span,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub struct ForeignItem<'hir> {
pub ident: Ident,
pub kind: ForeignItemKind<'hir>,
pub owner_id: OwnerId,
pub span: Span,
pub vis_span: Span,
}
impl ForeignItem<'_> {
#[inline]
pub fn hir_id(&self) -> HirId {
// Items are always HIR owners.
HirId::make_owner(self.owner_id.def_id)
}
pub fn foreign_item_id(&self) -> ForeignItemId {
ForeignItemId { owner_id: self.owner_id }
}
}
/// An item within an `extern` block.
#[derive(Debug, Clone, Copy, HashStable_Generic)]
pub enum ForeignItemKind<'hir> {
/// A foreign function.
Fn(&'hir FnDecl<'hir>, &'hir [Ident], &'hir Generics<'hir>),
/// A foreign static item (`static ext: u8`).
Static(&'hir Ty<'hir>, Mutability),
/// A foreign type.
Type,
}
/// A variable captured by a closure.
#[derive(Debug, Copy, Clone, HashStable_Generic)]
pub struct Upvar {
/// First span where it is accessed (there can be multiple).
pub span: Span,
}
// The TraitCandidate's import_ids is empty if the trait is defined in the same module, and
// has length > 0 if the trait is found through an chain of imports, starting with the
// import/use statement in the scope where the trait is used.
#[derive(Debug, Clone, HashStable_Generic)]
pub struct TraitCandidate {
pub def_id: DefId,
pub import_ids: SmallVec<[LocalDefId; 1]>,
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum OwnerNode<'hir> {
Item(&'hir Item<'hir>),
ForeignItem(&'hir ForeignItem<'hir>),
TraitItem(&'hir TraitItem<'hir>),
ImplItem(&'hir ImplItem<'hir>),
Crate(&'hir Mod<'hir>),
}
impl<'hir> OwnerNode<'hir> {
pub fn ident(&self) -> Option<Ident> {
match self {
OwnerNode::Item(Item { ident, .. })
| OwnerNode::ForeignItem(ForeignItem { ident, .. })
| OwnerNode::ImplItem(ImplItem { ident, .. })
| OwnerNode::TraitItem(TraitItem { ident, .. }) => Some(*ident),
OwnerNode::Crate(..) => None,
}
}
pub fn span(&self) -> Span {
match self {
OwnerNode::Item(Item { span, .. })
| OwnerNode::ForeignItem(ForeignItem { span, .. })
| OwnerNode::ImplItem(ImplItem { span, .. })
| OwnerNode::TraitItem(TraitItem { span, .. }) => *span,
OwnerNode::Crate(Mod { spans: ModSpans { inner_span, .. }, .. }) => *inner_span,
}
}
pub fn fn_decl(self) -> Option<&'hir FnDecl<'hir>> {
match self {
OwnerNode::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. })
| OwnerNode::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. })
| OwnerNode::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig.decl),
OwnerNode::ForeignItem(ForeignItem {
kind: ForeignItemKind::Fn(fn_decl, _, _),
..
}) => Some(fn_decl),
_ => None,
}
}
pub fn body_id(&self) -> Option<BodyId> {
match self {
OwnerNode::Item(Item {
kind:
ItemKind::Static(_, _, body)
| ItemKind::Const(_, _, body)
| ItemKind::Fn(_, _, body),
..
})
| OwnerNode::TraitItem(TraitItem {
kind:
TraitItemKind::Fn(_, TraitFn::Provided(body)) | TraitItemKind::Const(_, Some(body)),
..
})
| OwnerNode::ImplItem(ImplItem {
kind: ImplItemKind::Fn(_, body) | ImplItemKind::Const(_, body),
..
}) => Some(*body),
_ => None,
}
}
pub fn generics(self) -> Option<&'hir Generics<'hir>> {
Node::generics(self.into())
}
pub fn def_id(self) -> OwnerId {
match self {
OwnerNode::Item(Item { owner_id, .. })
| OwnerNode::TraitItem(TraitItem { owner_id, .. })
| OwnerNode::ImplItem(ImplItem { owner_id, .. })
| OwnerNode::ForeignItem(ForeignItem { owner_id, .. }) => *owner_id,
OwnerNode::Crate(..) => crate::CRATE_HIR_ID.owner,
}
}
pub fn expect_item(self) -> &'hir Item<'hir> {
match self {
OwnerNode::Item(n) => n,
_ => panic!(),
}
}
pub fn expect_foreign_item(self) -> &'hir ForeignItem<'hir> {
match self {
OwnerNode::ForeignItem(n) => n,
_ => panic!(),
}
}
pub fn expect_impl_item(self) -> &'hir ImplItem<'hir> {
match self {
OwnerNode::ImplItem(n) => n,
_ => panic!(),
}
}
pub fn expect_trait_item(self) -> &'hir TraitItem<'hir> {
match self {
OwnerNode::TraitItem(n) => n,
_ => panic!(),
}
}
}
impl<'hir> Into<OwnerNode<'hir>> for &'hir Item<'hir> {
fn into(self) -> OwnerNode<'hir> {
OwnerNode::Item(self)
}
}
impl<'hir> Into<OwnerNode<'hir>> for &'hir ForeignItem<'hir> {
fn into(self) -> OwnerNode<'hir> {
OwnerNode::ForeignItem(self)
}
}
impl<'hir> Into<OwnerNode<'hir>> for &'hir ImplItem<'hir> {
fn into(self) -> OwnerNode<'hir> {
OwnerNode::ImplItem(self)
}
}
impl<'hir> Into<OwnerNode<'hir>> for &'hir TraitItem<'hir> {
fn into(self) -> OwnerNode<'hir> {
OwnerNode::TraitItem(self)
}
}
impl<'hir> Into<Node<'hir>> for OwnerNode<'hir> {
fn into(self) -> Node<'hir> {
match self {
OwnerNode::Item(n) => Node::Item(n),
OwnerNode::ForeignItem(n) => Node::ForeignItem(n),
OwnerNode::ImplItem(n) => Node::ImplItem(n),
OwnerNode::TraitItem(n) => Node::TraitItem(n),
OwnerNode::Crate(n) => Node::Crate(n),
}
}
}
#[derive(Copy, Clone, Debug, HashStable_Generic)]
pub enum Node<'hir> {
Param(&'hir Param<'hir>),
Item(&'hir Item<'hir>),
ForeignItem(&'hir ForeignItem<'hir>),
TraitItem(&'hir TraitItem<'hir>),
ImplItem(&'hir ImplItem<'hir>),
Variant(&'hir Variant<'hir>),
Field(&'hir FieldDef<'hir>),
AnonConst(&'hir AnonConst),
ConstBlock(&'hir ConstBlock),
Expr(&'hir Expr<'hir>),
ExprField(&'hir ExprField<'hir>),
Stmt(&'hir Stmt<'hir>),
PathSegment(&'hir PathSegment<'hir>),
Ty(&'hir Ty<'hir>),
TypeBinding(&'hir TypeBinding<'hir>),
TraitRef(&'hir TraitRef<'hir>),
Pat(&'hir Pat<'hir>),
PatField(&'hir PatField<'hir>),
Arm(&'hir Arm<'hir>),
Block(&'hir Block<'hir>),
Local(&'hir Local<'hir>),
/// `Ctor` refers to the constructor of an enum variant or struct. Only tuple or unit variants
/// with synthesized constructors.
Ctor(&'hir VariantData<'hir>),
Lifetime(&'hir Lifetime),
GenericParam(&'hir GenericParam<'hir>),
Crate(&'hir Mod<'hir>),
Infer(&'hir InferArg),
}
impl<'hir> Node<'hir> {
/// Get the identifier of this `Node`, if applicable.
///
/// # Edge cases
///
/// Calling `.ident()` on a [`Node::Ctor`] will return `None`
/// because `Ctor`s do not have identifiers themselves.
/// Instead, call `.ident()` on the parent struct/variant, like so:
///
/// ```ignore (illustrative)
/// ctor
/// .ctor_hir_id()
/// .and_then(|ctor_id| tcx.hir().find_parent(ctor_id))
/// .and_then(|parent| parent.ident())
/// ```
pub fn ident(&self) -> Option<Ident> {
match self {
Node::TraitItem(TraitItem { ident, .. })
| Node::ImplItem(ImplItem { ident, .. })
| Node::ForeignItem(ForeignItem { ident, .. })
| Node::Field(FieldDef { ident, .. })
| Node::Variant(Variant { ident, .. })
| Node::Item(Item { ident, .. })
| Node::PathSegment(PathSegment { ident, .. }) => Some(*ident),
Node::Lifetime(lt) => Some(lt.ident),
Node::GenericParam(p) => Some(p.name.ident()),
Node::TypeBinding(b) => Some(b.ident),
Node::PatField(f) => Some(f.ident),
Node::ExprField(f) => Some(f.ident),
Node::Param(..)
| Node::AnonConst(..)
| Node::ConstBlock(..)
| Node::Expr(..)
| Node::Stmt(..)
| Node::Block(..)
| Node::Ctor(..)
| Node::Pat(..)
| Node::Arm(..)
| Node::Local(..)
| Node::Crate(..)
| Node::Ty(..)
| Node::TraitRef(..)
| Node::Infer(..) => None,
}
}
pub fn fn_decl(self) -> Option<&'hir FnDecl<'hir>> {
match self {
Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. })
| Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. })
| Node::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig.decl),
Node::Expr(Expr { kind: ExprKind::Closure(Closure { fn_decl, .. }), .. })
| Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, _, _), .. }) => {
Some(fn_decl)
}
_ => None,
}
}
pub fn fn_sig(self) -> Option<&'hir FnSig<'hir>> {
match self {
Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(fn_sig, _), .. })
| Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(fn_sig, _), .. })
| Node::Item(Item { kind: ItemKind::Fn(fn_sig, _, _), .. }) => Some(fn_sig),
_ => None,
}
}
/// Get the type for constants, assoc types, type aliases and statics.
pub fn ty(self) -> Option<&'hir Ty<'hir>> {
match self {
Node::Item(it) => match it.kind {
ItemKind::TyAlias(ty, _)
| ItemKind::Static(ty, _, _)
| ItemKind::Const(ty, _, _) => Some(ty),
_ => None,
},
Node::TraitItem(it) => match it.kind {
TraitItemKind::Const(ty, _) => Some(ty),
TraitItemKind::Type(_, ty) => ty,
_ => None,
},
Node::ImplItem(it) => match it.kind {
ImplItemKind::Const(ty, _) => Some(ty),
ImplItemKind::Type(ty) => Some(ty),
_ => None,
},
_ => None,
}
}
pub fn alias_ty(self) -> Option<&'hir Ty<'hir>> {
match self {
Node::Item(Item { kind: ItemKind::TyAlias(ty, ..), .. }) => Some(ty),
_ => None,
}
}
pub fn body_id(&self) -> Option<BodyId> {
match self {
Node::Item(Item {
kind:
ItemKind::Static(_, _, body)
| ItemKind::Const(_, _, body)
| ItemKind::Fn(_, _, body),
..
})
| Node::TraitItem(TraitItem {
kind:
TraitItemKind::Fn(_, TraitFn::Provided(body)) | TraitItemKind::Const(_, Some(body)),
..
})
| Node::ImplItem(ImplItem {
kind: ImplItemKind::Fn(_, body) | ImplItemKind::Const(_, body),
..
})
| Node::Expr(Expr {
kind:
ExprKind::ConstBlock(ConstBlock { body, .. })
| ExprKind::Closure(Closure { body, .. })
| ExprKind::Repeat(_, ArrayLen::Body(AnonConst { body, .. })),
..
}) => Some(*body),
_ => None,
}
}
pub fn generics(self) -> Option<&'hir Generics<'hir>> {
match self {
Node::ForeignItem(ForeignItem {
kind: ForeignItemKind::Fn(_, _, generics), ..
})
| Node::TraitItem(TraitItem { generics, .. })
| Node::ImplItem(ImplItem { generics, .. }) => Some(generics),
Node::Item(item) => item.kind.generics(),
_ => None,
}
}
pub fn as_owner(self) -> Option<OwnerNode<'hir>> {
match self {
Node::Item(i) => Some(OwnerNode::Item(i)),
Node::ForeignItem(i) => Some(OwnerNode::ForeignItem(i)),
Node::TraitItem(i) => Some(OwnerNode::TraitItem(i)),
Node::ImplItem(i) => Some(OwnerNode::ImplItem(i)),
Node::Crate(i) => Some(OwnerNode::Crate(i)),
_ => None,
}
}
pub fn fn_kind(self) -> Option<FnKind<'hir>> {
match self {
Node::Item(i) => match i.kind {
ItemKind::Fn(ref sig, ref generics, _) => {
Some(FnKind::ItemFn(i.ident, generics, sig.header))
}
_ => None,
},
Node::TraitItem(ti) => match ti.kind {
TraitItemKind::Fn(ref sig, TraitFn::Provided(_)) => {
Some(FnKind::Method(ti.ident, sig))
}
_ => None,
},
Node::ImplItem(ii) => match ii.kind {
ImplItemKind::Fn(ref sig, _) => Some(FnKind::Method(ii.ident, sig)),
_ => None,
},
Node::Expr(e) => match e.kind {
ExprKind::Closure { .. } => Some(FnKind::Closure),
_ => None,
},
_ => None,
}
}
/// Get the fields for the tuple-constructor,
/// if this node is a tuple constructor, otherwise None
pub fn tuple_fields(&self) -> Option<&'hir [FieldDef<'hir>]> {
if let Node::Ctor(&VariantData::Tuple(fields, _, _)) = self { Some(fields) } else { None }
}
/// Expect a [`Node::Param`] or panic.
#[track_caller]
pub fn expect_param(self) -> &'hir Param<'hir> {
let Node::Param(this) = self else { self.expect_failed("a parameter") };
this
}
/// Expect a [`Node::Item`] or panic.
#[track_caller]
pub fn expect_item(self) -> &'hir Item<'hir> {
let Node::Item(this) = self else { self.expect_failed("a item") };
this
}
/// Expect a [`Node::ForeignItem`] or panic.
#[track_caller]
pub fn expect_foreign_item(self) -> &'hir ForeignItem<'hir> {
let Node::ForeignItem(this) = self else { self.expect_failed("a foreign item") };
this
}
/// Expect a [`Node::TraitItem`] or panic.
#[track_caller]
pub fn expect_trait_item(self) -> &'hir TraitItem<'hir> {
let Node::TraitItem(this) = self else { self.expect_failed("a trait item") };
this
}
/// Expect a [`Node::ImplItem`] or panic.
#[track_caller]
pub fn expect_impl_item(self) -> &'hir ImplItem<'hir> {
let Node::ImplItem(this) = self else { self.expect_failed("an implementation item") };
this
}
/// Expect a [`Node::Variant`] or panic.
#[track_caller]
pub fn expect_variant(self) -> &'hir Variant<'hir> {
let Node::Variant(this) = self else { self.expect_failed("a variant") };
this
}
/// Expect a [`Node::Field`] or panic.
#[track_caller]
pub fn expect_field(self) -> &'hir FieldDef<'hir> {
let Node::Field(this) = self else { self.expect_failed("a field definition") };
this
}
/// Expect a [`Node::AnonConst`] or panic.
#[track_caller]
pub fn expect_anon_const(self) -> &'hir AnonConst {
let Node::AnonConst(this) = self else { self.expect_failed("an anonymous constant") };
this
}
/// Expect a [`Node::ConstBlock`] or panic.
#[track_caller]
pub fn expect_inline_const(self) -> &'hir ConstBlock {
let Node::ConstBlock(this) = self else { self.expect_failed("an inline constant") };
this
}
/// Expect a [`Node::Expr`] or panic.
#[track_caller]
pub fn expect_expr(self) -> &'hir Expr<'hir> {
let Node::Expr(this) = self else { self.expect_failed("an expression") };
this
}
/// Expect a [`Node::ExprField`] or panic.
#[track_caller]
pub fn expect_expr_field(self) -> &'hir ExprField<'hir> {
let Node::ExprField(this) = self else { self.expect_failed("an expression field") };
this
}
/// Expect a [`Node::Stmt`] or panic.
#[track_caller]
pub fn expect_stmt(self) -> &'hir Stmt<'hir> {
let Node::Stmt(this) = self else { self.expect_failed("a statement") };
this
}
/// Expect a [`Node::PathSegment`] or panic.
#[track_caller]
pub fn expect_path_segment(self) -> &'hir PathSegment<'hir> {
let Node::PathSegment(this) = self else { self.expect_failed("a path segment") };
this
}
/// Expect a [`Node::Ty`] or panic.
#[track_caller]
pub fn expect_ty(self) -> &'hir Ty<'hir> {
let Node::Ty(this) = self else { self.expect_failed("a type") };
this
}
/// Expect a [`Node::TypeBinding`] or panic.
#[track_caller]
pub fn expect_type_binding(self) -> &'hir TypeBinding<'hir> {
let Node::TypeBinding(this) = self else { self.expect_failed("a type binding") };
this
}
/// Expect a [`Node::TraitRef`] or panic.
#[track_caller]
pub fn expect_trait_ref(self) -> &'hir TraitRef<'hir> {
let Node::TraitRef(this) = self else { self.expect_failed("a trait reference") };
this
}
/// Expect a [`Node::Pat`] or panic.
#[track_caller]
pub fn expect_pat(self) -> &'hir Pat<'hir> {
let Node::Pat(this) = self else { self.expect_failed("a pattern") };
this
}
/// Expect a [`Node::PatField`] or panic.
#[track_caller]
pub fn expect_pat_field(self) -> &'hir PatField<'hir> {
let Node::PatField(this) = self else { self.expect_failed("a pattern field") };
this
}
/// Expect a [`Node::Arm`] or panic.
#[track_caller]
pub fn expect_arm(self) -> &'hir Arm<'hir> {
let Node::Arm(this) = self else { self.expect_failed("an arm") };
this
}
/// Expect a [`Node::Block`] or panic.
#[track_caller]
pub fn expect_block(self) -> &'hir Block<'hir> {
let Node::Block(this) = self else { self.expect_failed("a block") };
this
}
/// Expect a [`Node::Local`] or panic.
#[track_caller]
pub fn expect_local(self) -> &'hir Local<'hir> {
let Node::Local(this) = self else { self.expect_failed("a local") };
this
}
/// Expect a [`Node::Ctor`] or panic.
#[track_caller]
pub fn expect_ctor(self) -> &'hir VariantData<'hir> {
let Node::Ctor(this) = self else { self.expect_failed("a constructor") };
this
}
/// Expect a [`Node::Lifetime`] or panic.
#[track_caller]
pub fn expect_lifetime(self) -> &'hir Lifetime {
let Node::Lifetime(this) = self else { self.expect_failed("a lifetime") };
this
}
/// Expect a [`Node::GenericParam`] or panic.
#[track_caller]
pub fn expect_generic_param(self) -> &'hir GenericParam<'hir> {
let Node::GenericParam(this) = self else { self.expect_failed("a generic parameter") };
this
}
/// Expect a [`Node::Crate`] or panic.
#[track_caller]
pub fn expect_crate(self) -> &'hir Mod<'hir> {
let Node::Crate(this) = self else { self.expect_failed("a crate") };
this
}
/// Expect a [`Node::Infer`] or panic.
#[track_caller]
pub fn expect_infer(self) -> &'hir InferArg {
let Node::Infer(this) = self else { self.expect_failed("an infer") };
this
}
#[track_caller]
fn expect_failed(&self, expected: &'static str) -> ! {
panic!("expected {expected} node, found {self:?}")
}
}
// Some nodes are used a lot. Make sure they don't unintentionally get bigger.
#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
mod size_asserts {
use super::*;
// tidy-alphabetical-start
static_assert_size!(Block<'_>, 48);
static_assert_size!(Body<'_>, 32);
static_assert_size!(Expr<'_>, 64);
static_assert_size!(ExprKind<'_>, 48);
static_assert_size!(FnDecl<'_>, 40);
static_assert_size!(ForeignItem<'_>, 72);
static_assert_size!(ForeignItemKind<'_>, 40);
static_assert_size!(GenericArg<'_>, 32);
static_assert_size!(GenericBound<'_>, 48);
static_assert_size!(Generics<'_>, 56);
static_assert_size!(Impl<'_>, 80);
static_assert_size!(ImplItem<'_>, 88);
static_assert_size!(ImplItemKind<'_>, 40);
static_assert_size!(Item<'_>, 88);
static_assert_size!(ItemKind<'_>, 56);
static_assert_size!(Local<'_>, 64);
static_assert_size!(Param<'_>, 32);
static_assert_size!(Pat<'_>, 72);
static_assert_size!(Path<'_>, 40);
static_assert_size!(PathSegment<'_>, 48);
static_assert_size!(PatKind<'_>, 48);
static_assert_size!(QPath<'_>, 24);
static_assert_size!(Res, 12);
static_assert_size!(Stmt<'_>, 32);
static_assert_size!(StmtKind<'_>, 16);
static_assert_size!(TraitItem<'_>, 88);
static_assert_size!(TraitItemKind<'_>, 48);
static_assert_size!(Ty<'_>, 48);
static_assert_size!(TyKind<'_>, 32);
// tidy-alphabetical-end
}
fn debug_fn(f: impl Fn(&mut fmt::Formatter<'_>) -> fmt::Result) -> impl fmt::Debug {
struct DebugFn<F>(F);
impl<F: Fn(&mut fmt::Formatter<'_>) -> fmt::Result> fmt::Debug for DebugFn<F> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
(self.0)(fmt)
}
}
DebugFn(f)
}