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
|
/* Line completion stuff for GDB, the GNU debugger.
Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "filenames.h" /* For DOSish file names. */
#include "language.h"
#include "gdbsupport/gdb_signals.h"
#include "target.h"
#include "reggroups.h"
#include "user-regs.h"
#include "arch-utils.h"
#include "location.h"
#include <algorithm>
#include "linespec.h"
#include "cli/cli-decode.h"
/* FIXME: This is needed because of lookup_cmd_1 (). We should be
calling a hook instead so we eliminate the CLI dependency. */
#include "gdbcmd.h"
/* Needed for rl_completer_word_break_characters() and for
rl_filename_completion_function. */
#include "readline/readline.h"
/* readline defines this. */
#undef savestring
#include "completer.h"
/* See completer.h. */
class completion_tracker::completion_hash_entry
{
public:
/* Constructor. */
completion_hash_entry (gdb::unique_xmalloc_ptr<char> name,
gdb::unique_xmalloc_ptr<char> lcd)
: m_name (std::move (name)),
m_lcd (std::move (lcd))
{
/* Nothing. */
}
/* Returns a pointer to the lowest common denominator string. This
string will only be valid while this hash entry is still valid as the
string continues to be owned by this hash entry and will be released
when this entry is deleted. */
char *get_lcd () const
{
return m_lcd.get ();
}
/* Get, and release the name field from this hash entry. This can only
be called once, after which the name field is no longer valid. This
should be used to pass ownership of the name to someone else. */
char *release_name ()
{
return m_name.release ();
}
/* Return true of the name in this hash entry is STR. */
bool is_name_eq (const char *str) const
{
return strcmp (m_name.get (), str) == 0;
}
/* Return the hash value based on the name of the entry. */
hashval_t hash_name () const
{
return htab_hash_string (m_name.get ());
}
/* A static function that can be passed to the htab hash system to be
used as a callback that deletes an item from the hash. */
static void deleter (void *arg)
{
completion_hash_entry *entry = (completion_hash_entry *) arg;
delete entry;
}
private:
/* The symbol name stored in this hash entry. */
gdb::unique_xmalloc_ptr<char> m_name;
/* The lowest common denominator string computed for this hash entry. */
gdb::unique_xmalloc_ptr<char> m_lcd;
};
/* Misc state that needs to be tracked across several different
readline completer entry point calls, all related to a single
completion invocation. */
struct gdb_completer_state
{
/* The current completion's completion tracker. This is a global
because a tracker can be shared between the handle_brkchars and
handle_completion phases, which involves different readline
callbacks. */
completion_tracker *tracker = NULL;
/* Whether the current completion was aborted. */
bool aborted = false;
};
/* The current completion state. */
static gdb_completer_state current_completion;
/* An enumeration of the various things a user might attempt to
complete for a location. If you change this, remember to update
the explicit_options array below too. */
enum explicit_location_match_type
{
/* The filename of a source file. */
MATCH_SOURCE,
/* The name of a function or method. */
MATCH_FUNCTION,
/* The fully-qualified name of a function or method. */
MATCH_QUALIFIED,
/* A line number. */
MATCH_LINE,
/* The name of a label. */
MATCH_LABEL
};
/* Prototypes for local functions. */
/* readline uses the word breaks for two things:
(1) In figuring out where to point the TEXT parameter to the
rl_completion_entry_function. Since we don't use TEXT for much,
it doesn't matter a lot what the word breaks are for this purpose,
but it does affect how much stuff M-? lists.
(2) If one of the matches contains a word break character, readline
will quote it. That's why we switch between
current_language->word_break_characters () and
gdb_completer_command_word_break_characters. I'm not sure when
we need this behavior (perhaps for funky characters in C++
symbols?). */
/* Variables which are necessary for fancy command line editing. */
/* When completing on command names, we remove '-' and '.' from the list of
word break characters, since we use it in command names. If the
readline library sees one in any of the current completion strings,
it thinks that the string needs to be quoted and automatically
supplies a leading quote. */
static const char gdb_completer_command_word_break_characters[] =
" \t\n!@#$%^&*()+=|~`}{[]\"';:?/><,";
/* When completing on file names, we remove from the list of word
break characters any characters that are commonly used in file
names, such as '-', '+', '~', etc. Otherwise, readline displays
incorrect completion candidates. */
/* MS-DOS and MS-Windows use colon as part of the drive spec, and most
programs support @foo style response files. */
static const char gdb_completer_file_name_break_characters[] =
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
" \t\n*|\"';?><@";
#else
" \t\n*|\"';:?><";
#endif
/* Characters that can be used to quote completion strings. Note that
we can't include '"' because the gdb C parser treats such quoted
sequences as strings. */
static const char gdb_completer_quote_characters[] = "'";
/* Accessor for some completer data that may interest other files. */
const char *
get_gdb_completer_quote_characters (void)
{
return gdb_completer_quote_characters;
}
/* This can be used for functions which don't want to complete on
symbols but don't want to complete on anything else either. */
void
noop_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *prefix)
{
}
/* Complete on filenames. */
void
filename_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
int subsequent_name;
subsequent_name = 0;
while (1)
{
gdb::unique_xmalloc_ptr<char> p_rl
(rl_filename_completion_function (text, subsequent_name));
if (p_rl == NULL)
break;
/* We need to set subsequent_name to a non-zero value before the
continue line below, because otherwise, if the first file
seen by GDB is a backup file whose name ends in a `~', we
will loop indefinitely. */
subsequent_name = 1;
/* Like emacs, don't complete on old versions. Especially
useful in the "source" command. */
const char *p = p_rl.get ();
if (p[strlen (p) - 1] == '~')
continue;
tracker.add_completion
(make_completion_match_str (std::move (p_rl), text, word));
}
#if 0
/* There is no way to do this just long enough to affect quote
inserting without also affecting the next completion. This
should be fixed in readline. FIXME. */
/* Ensure that readline does the right thing
with respect to inserting quotes. */
rl_completer_word_break_characters = "";
#endif
}
/* The corresponding completer_handle_brkchars
implementation. */
static void
filename_completer_handle_brkchars (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
set_rl_completer_word_break_characters
(gdb_completer_file_name_break_characters);
}
/* Possible values for the found_quote flags word used by the completion
functions. It says what kind of (shell-like) quoting we found anywhere
in the line. */
#define RL_QF_SINGLE_QUOTE 0x01
#define RL_QF_DOUBLE_QUOTE 0x02
#define RL_QF_BACKSLASH 0x04
#define RL_QF_OTHER_QUOTE 0x08
/* Find the bounds of the current word for completion purposes, and
return a pointer to the end of the word. This mimics (and is a
modified version of) readline's _rl_find_completion_word internal
function.
This function skips quoted substrings (characters between matched
pairs of characters in rl_completer_quote_characters). We try to
find an unclosed quoted substring on which to do matching. If one
is not found, we use the word break characters to find the
boundaries of the current word. QC, if non-null, is set to the
opening quote character if we found an unclosed quoted substring,
'\0' otherwise. DP, if non-null, is set to the value of the
delimiter character that caused a word break. */
struct gdb_rl_completion_word_info
{
const char *word_break_characters;
const char *quote_characters;
const char *basic_quote_characters;
};
static const char *
gdb_rl_find_completion_word (struct gdb_rl_completion_word_info *info,
int *qc, int *dp,
const char *line_buffer)
{
int scan, end, found_quote, delimiter, pass_next, isbrk;
char quote_char;
const char *brkchars;
int point = strlen (line_buffer);
/* The algorithm below does '--point'. Avoid buffer underflow with
the empty string. */
if (point == 0)
{
if (qc != NULL)
*qc = '\0';
if (dp != NULL)
*dp = '\0';
return line_buffer;
}
end = point;
found_quote = delimiter = 0;
quote_char = '\0';
brkchars = info->word_break_characters;
if (info->quote_characters != NULL)
{
/* We have a list of characters which can be used in pairs to
quote substrings for the completer. Try to find the start of
an unclosed quoted substring. */
/* FOUND_QUOTE is set so we know what kind of quotes we
found. */
for (scan = pass_next = 0;
scan < end;
scan++)
{
if (pass_next)
{
pass_next = 0;
continue;
}
/* Shell-like semantics for single quotes -- don't allow
backslash to quote anything in single quotes, especially
not the closing quote. If you don't like this, take out
the check on the value of quote_char. */
if (quote_char != '\'' && line_buffer[scan] == '\\')
{
pass_next = 1;
found_quote |= RL_QF_BACKSLASH;
continue;
}
if (quote_char != '\0')
{
/* Ignore everything until the matching close quote
char. */
if (line_buffer[scan] == quote_char)
{
/* Found matching close. Abandon this
substring. */
quote_char = '\0';
point = end;
}
}
else if (strchr (info->quote_characters, line_buffer[scan]))
{
/* Found start of a quoted substring. */
quote_char = line_buffer[scan];
point = scan + 1;
/* Shell-like quoting conventions. */
if (quote_char == '\'')
found_quote |= RL_QF_SINGLE_QUOTE;
else if (quote_char == '"')
found_quote |= RL_QF_DOUBLE_QUOTE;
else
found_quote |= RL_QF_OTHER_QUOTE;
}
}
}
if (point == end && quote_char == '\0')
{
/* We didn't find an unclosed quoted substring upon which to do
completion, so use the word break characters to find the
substring on which to complete. */
while (--point)
{
scan = line_buffer[point];
if (strchr (brkchars, scan) != 0)
break;
}
}
/* If we are at an unquoted word break, then advance past it. */
scan = line_buffer[point];
if (scan)
{
isbrk = strchr (brkchars, scan) != 0;
if (isbrk)
{
/* If the character that caused the word break was a quoting
character, then remember it as the delimiter. */
if (info->basic_quote_characters
&& strchr (info->basic_quote_characters, scan)
&& (end - point) > 1)
delimiter = scan;
point++;
}
}
if (qc != NULL)
*qc = quote_char;
if (dp != NULL)
*dp = delimiter;
return line_buffer + point;
}
/* Find the completion word point for TEXT, emulating the algorithm
readline uses to find the word point, using WORD_BREAK_CHARACTERS
as word break characters. */
static const char *
advance_to_completion_word (completion_tracker &tracker,
const char *word_break_characters,
const char *text)
{
gdb_rl_completion_word_info info;
info.word_break_characters = word_break_characters;
info.quote_characters = gdb_completer_quote_characters;
info.basic_quote_characters = rl_basic_quote_characters;
int delimiter;
const char *start
= gdb_rl_find_completion_word (&info, NULL, &delimiter, text);
tracker.advance_custom_word_point_by (start - text);
if (delimiter)
{
tracker.set_quote_char (delimiter);
tracker.set_suppress_append_ws (true);
}
return start;
}
/* See completer.h. */
const char *
advance_to_expression_complete_word_point (completion_tracker &tracker,
const char *text)
{
const char *brk_chars = current_language->word_break_characters ();
return advance_to_completion_word (tracker, brk_chars, text);
}
/* See completer.h. */
const char *
advance_to_filename_complete_word_point (completion_tracker &tracker,
const char *text)
{
const char *brk_chars = gdb_completer_file_name_break_characters;
return advance_to_completion_word (tracker, brk_chars, text);
}
/* See completer.h. */
bool
completion_tracker::completes_to_completion_word (const char *word)
{
recompute_lowest_common_denominator ();
if (m_lowest_common_denominator_unique)
{
const char *lcd = m_lowest_common_denominator;
if (strncmp_iw (word, lcd, strlen (lcd)) == 0)
{
/* Maybe skip the function and complete on keywords. */
size_t wordlen = strlen (word);
if (word[wordlen - 1] == ' ')
return true;
}
}
return false;
}
/* See completer.h. */
void
complete_nested_command_line (completion_tracker &tracker, const char *text)
{
/* Must be called from a custom-word-point completer. */
gdb_assert (tracker.use_custom_word_point ());
/* Disable the custom word point temporarily, because we want to
probe whether the command we're completing itself uses a custom
word point. */
tracker.set_use_custom_word_point (false);
size_t save_custom_word_point = tracker.custom_word_point ();
int quote_char = '\0';
const char *word = completion_find_completion_word (tracker, text,
"e_char);
if (tracker.use_custom_word_point ())
{
/* The command we're completing uses a custom word point, so the
tracker already contains the matches. We're done. */
return;
}
/* Restore the custom word point settings. */
tracker.set_custom_word_point (save_custom_word_point);
tracker.set_use_custom_word_point (true);
/* Run the handle_completions completer phase. */
complete_line (tracker, word, text, strlen (text));
}
/* Complete on linespecs, which might be of two possible forms:
file:line
or
symbol+offset
This is intended to be used in commands that set breakpoints
etc. */
static void
complete_files_symbols (completion_tracker &tracker,
const char *text, const char *word)
{
completion_list fn_list;
const char *p;
int quote_found = 0;
int quoted = *text == '\'' || *text == '"';
int quote_char = '\0';
const char *colon = NULL;
char *file_to_match = NULL;
const char *symbol_start = text;
const char *orig_text = text;
/* Do we have an unquoted colon, as in "break foo.c:bar"? */
for (p = text; *p != '\0'; ++p)
{
if (*p == '\\' && p[1] == '\'')
p++;
else if (*p == '\'' || *p == '"')
{
quote_found = *p;
quote_char = *p++;
while (*p != '\0' && *p != quote_found)
{
if (*p == '\\' && p[1] == quote_found)
p++;
p++;
}
if (*p == quote_found)
quote_found = 0;
else
break; /* Hit the end of text. */
}
#if HAVE_DOS_BASED_FILE_SYSTEM
/* If we have a DOS-style absolute file name at the beginning of
TEXT, and the colon after the drive letter is the only colon
we found, pretend the colon is not there. */
else if (p < text + 3 && *p == ':' && p == text + 1 + quoted)
;
#endif
else if (*p == ':' && !colon)
{
colon = p;
symbol_start = p + 1;
}
else if (strchr (current_language->word_break_characters (), *p))
symbol_start = p + 1;
}
if (quoted)
text++;
/* Where is the file name? */
if (colon)
{
char *s;
file_to_match = (char *) xmalloc (colon - text + 1);
strncpy (file_to_match, text, colon - text);
file_to_match[colon - text] = '\0';
/* Remove trailing colons and quotes from the file name. */
for (s = file_to_match + (colon - text);
s > file_to_match;
s--)
if (*s == ':' || *s == quote_char)
*s = '\0';
}
/* If the text includes a colon, they want completion only on a
symbol name after the colon. Otherwise, we need to complete on
symbols as well as on files. */
if (colon)
{
collect_file_symbol_completion_matches (tracker,
complete_symbol_mode::EXPRESSION,
symbol_name_match_type::EXPRESSION,
symbol_start, word,
file_to_match);
xfree (file_to_match);
}
else
{
size_t text_len = strlen (text);
collect_symbol_completion_matches (tracker,
complete_symbol_mode::EXPRESSION,
symbol_name_match_type::EXPRESSION,
symbol_start, word);
/* If text includes characters which cannot appear in a file
name, they cannot be asking for completion on files. */
if (strcspn (text,
gdb_completer_file_name_break_characters) == text_len)
fn_list = make_source_files_completion_list (text, text);
}
if (!fn_list.empty () && !tracker.have_completions ())
{
/* If we only have file names as possible completion, we should
bring them in sync with what rl_complete expects. The
problem is that if the user types "break /foo/b TAB", and the
possible completions are "/foo/bar" and "/foo/baz"
rl_complete expects us to return "bar" and "baz", without the
leading directories, as possible completions, because `word'
starts at the "b". But we ignore the value of `word' when we
call make_source_files_completion_list above (because that
would not DTRT when the completion results in both symbols
and file names), so make_source_files_completion_list returns
the full "/foo/bar" and "/foo/baz" strings. This produces
wrong results when, e.g., there's only one possible
completion, because rl_complete will prepend "/foo/" to each
candidate completion. The loop below removes that leading
part. */
for (const auto &fn_up: fn_list)
{
char *fn = fn_up.get ();
memmove (fn, fn + (word - text), strlen (fn) + 1 - (word - text));
}
}
tracker.add_completions (std::move (fn_list));
if (!tracker.have_completions ())
{
/* No completions at all. As the final resort, try completing
on the entire text as a symbol. */
collect_symbol_completion_matches (tracker,
complete_symbol_mode::EXPRESSION,
symbol_name_match_type::EXPRESSION,
orig_text, word);
}
}
/* See completer.h. */
completion_list
complete_source_filenames (const char *text)
{
size_t text_len = strlen (text);
/* If text includes characters which cannot appear in a file name,
the user cannot be asking for completion on files. */
if (strcspn (text,
gdb_completer_file_name_break_characters)
== text_len)
return make_source_files_completion_list (text, text);
return {};
}
/* Complete address and linespec locations. */
static void
complete_address_and_linespec_locations (completion_tracker &tracker,
const char *text,
symbol_name_match_type match_type)
{
if (*text == '*')
{
tracker.advance_custom_word_point_by (1);
text++;
const char *word
= advance_to_expression_complete_word_point (tracker, text);
complete_expression (tracker, text, word);
}
else
{
linespec_complete (tracker, text, match_type);
}
}
/* The explicit location options. Note that indexes into this array
must match the explicit_location_match_type enumerators. */
static const char *const explicit_options[] =
{
"-source",
"-function",
"-qualified",
"-line",
"-label",
NULL
};
/* The probe modifier options. These can appear before a location in
breakpoint commands. */
static const char *const probe_options[] =
{
"-probe",
"-probe-stap",
"-probe-dtrace",
NULL
};
/* Returns STRING if not NULL, the empty string otherwise. */
static const char *
string_or_empty (const char *string)
{
return string != NULL ? string : "";
}
/* A helper function to collect explicit location matches for the given
LOCATION, which is attempting to match on WORD. */
static void
collect_explicit_location_matches (completion_tracker &tracker,
struct event_location *location,
enum explicit_location_match_type what,
const char *word,
const struct language_defn *language)
{
const struct explicit_location *explicit_loc
= get_explicit_location (location);
/* True if the option expects an argument. */
bool needs_arg = true;
/* Note, in the various MATCH_* below, we complete on
explicit_loc->foo instead of WORD, because only the former will
have already skipped past any quote char. */
switch (what)
{
case MATCH_SOURCE:
{
const char *source = string_or_empty (explicit_loc->source_filename);
completion_list matches
= make_source_files_completion_list (source, source);
tracker.add_completions (std::move (matches));
}
break;
case MATCH_FUNCTION:
{
const char *function = string_or_empty (explicit_loc->function_name);
linespec_complete_function (tracker, function,
explicit_loc->func_name_match_type,
explicit_loc->source_filename);
}
break;
case MATCH_QUALIFIED:
needs_arg = false;
break;
case MATCH_LINE:
/* Nothing to offer. */
break;
case MATCH_LABEL:
{
const char *label = string_or_empty (explicit_loc->label_name);
linespec_complete_label (tracker, language,
explicit_loc->source_filename,
explicit_loc->function_name,
explicit_loc->func_name_match_type,
label);
}
break;
default:
gdb_assert_not_reached ("unhandled explicit_location_match_type");
}
if (!needs_arg || tracker.completes_to_completion_word (word))
{
tracker.discard_completions ();
tracker.advance_custom_word_point_by (strlen (word));
complete_on_enum (tracker, explicit_options, "", "");
complete_on_enum (tracker, linespec_keywords, "", "");
}
else if (!tracker.have_completions ())
{
/* Maybe we have an unterminated linespec keyword at the tail of
the string. Try completing on that. */
size_t wordlen = strlen (word);
const char *keyword = word + wordlen;
if (wordlen > 0 && keyword[-1] != ' ')
{
while (keyword > word && *keyword != ' ')
keyword--;
/* Don't complete on keywords if we'd be completing on the
whole explicit linespec option. E.g., "b -function
thr<tab>" should not complete to the "thread"
keyword. */
if (keyword != word)
{
keyword = skip_spaces (keyword);
tracker.advance_custom_word_point_by (keyword - word);
complete_on_enum (tracker, linespec_keywords, keyword, keyword);
}
}
else if (wordlen > 0 && keyword[-1] == ' ')
{
/* Assume that we're maybe past the explicit location
argument, and we didn't manage to find any match because
the user wants to create a pending breakpoint. Offer the
keyword and explicit location options as possible
completions. */
tracker.advance_custom_word_point_by (keyword - word);
complete_on_enum (tracker, linespec_keywords, keyword, keyword);
complete_on_enum (tracker, explicit_options, keyword, keyword);
}
}
}
/* If the next word in *TEXT_P is any of the keywords in KEYWORDS,
then advance both TEXT_P and the word point in the tracker past the
keyword and return the (0-based) index in the KEYWORDS array that
matched. Otherwise, return -1. */
static int
skip_keyword (completion_tracker &tracker,
const char * const *keywords, const char **text_p)
{
const char *text = *text_p;
const char *after = skip_to_space (text);
size_t len = after - text;
if (text[len] != ' ')
return -1;
int found = -1;
for (int i = 0; keywords[i] != NULL; i++)
{
if (strncmp (keywords[i], text, len) == 0)
{
if (found == -1)
found = i;
else
return -1;
}
}
if (found != -1)
{
tracker.advance_custom_word_point_by (len + 1);
text += len + 1;
*text_p = text;
return found;
}
return -1;
}
/* A completer function for explicit locations. This function
completes both options ("-source", "-line", etc) and values. If
completing a quoted string, then QUOTED_ARG_START and
QUOTED_ARG_END point to the quote characters. LANGUAGE is the
current language. */
static void
complete_explicit_location (completion_tracker &tracker,
struct event_location *location,
const char *text,
const language_defn *language,
const char *quoted_arg_start,
const char *quoted_arg_end)
{
if (*text != '-')
return;
int keyword = skip_keyword (tracker, explicit_options, &text);
if (keyword == -1)
complete_on_enum (tracker, explicit_options, text, text);
else
{
/* Completing on value. */
enum explicit_location_match_type what
= (explicit_location_match_type) keyword;
if (quoted_arg_start != NULL && quoted_arg_end != NULL)
{
if (quoted_arg_end[1] == '\0')
{
/* If completing a quoted string with the cursor right
at the terminating quote char, complete the
completion word without interpretation, so that
readline advances the cursor one whitespace past the
quote, even if there's no match. This makes these
cases behave the same:
before: "b -function function()"
after: "b -function function() "
before: "b -function 'function()'"
after: "b -function 'function()' "
and trusts the user in this case:
before: "b -function 'not_loaded_function_yet()'"
after: "b -function 'not_loaded_function_yet()' "
*/
tracker.add_completion (make_unique_xstrdup (text));
}
else if (quoted_arg_end[1] == ' ')
{
/* We're maybe past the explicit location argument.
Skip the argument without interpretation, assuming the
user may want to create pending breakpoint. Offer
the keyword and explicit location options as possible
completions. */
tracker.advance_custom_word_point_by (strlen (text));
complete_on_enum (tracker, linespec_keywords, "", "");
complete_on_enum (tracker, explicit_options, "", "");
}
return;
}
/* Now gather matches */
collect_explicit_location_matches (tracker, location, what, text,
language);
}
}
/* A completer for locations. */
void
location_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char * /* word */)
{
int found_probe_option = -1;
/* If we have a probe modifier, skip it. This can only appear as
first argument. Until we have a specific completer for probes,
falling back to the linespec completer for the remainder of the
line is better than nothing. */
if (text[0] == '-' && text[1] == 'p')
found_probe_option = skip_keyword (tracker, probe_options, &text);
const char *option_text = text;
int saved_word_point = tracker.custom_word_point ();
const char *copy = text;
explicit_completion_info completion_info;
event_location_up location
= string_to_explicit_location (©, current_language,
&completion_info);
if (completion_info.quoted_arg_start != NULL
&& completion_info.quoted_arg_end == NULL)
{
/* Found an unbalanced quote. */
tracker.set_quote_char (*completion_info.quoted_arg_start);
tracker.advance_custom_word_point_by (1);
}
if (completion_info.saw_explicit_location_option)
{
if (*copy != '\0')
{
tracker.advance_custom_word_point_by (copy - text);
text = copy;
/* We found a terminator at the tail end of the string,
which means we're past the explicit location options. We
may have a keyword to complete on. If we have a whole
keyword, then complete whatever comes after as an
expression. This is mainly for the "if" keyword. If the
"thread" and "task" keywords gain their own completers,
they should be used here. */
int keyword = skip_keyword (tracker, linespec_keywords, &text);
if (keyword == -1)
{
complete_on_enum (tracker, linespec_keywords, text, text);
}
else
{
const char *word
= advance_to_expression_complete_word_point (tracker, text);
complete_expression (tracker, text, word);
}
}
else
{
tracker.advance_custom_word_point_by (completion_info.last_option
- text);
text = completion_info.last_option;
complete_explicit_location (tracker, location.get (), text,
current_language,
completion_info.quoted_arg_start,
completion_info.quoted_arg_end);
}
}
/* This is an address or linespec location. */
else if (location != NULL)
{
/* Handle non-explicit location options. */
int keyword = skip_keyword (tracker, explicit_options, &text);
if (keyword == -1)
complete_on_enum (tracker, explicit_options, text, text);
else
{
tracker.advance_custom_word_point_by (copy - text);
text = copy;
symbol_name_match_type match_type
= get_explicit_location (location.get ())->func_name_match_type;
complete_address_and_linespec_locations (tracker, text, match_type);
}
}
else
{
/* No options. */
complete_address_and_linespec_locations (tracker, text,
symbol_name_match_type::WILD);
}
/* Add matches for option names, if either:
- Some completer above found some matches, but the word point did
not advance (e.g., "b <tab>" finds all functions, or "b -<tab>"
matches all objc selectors), or;
- Some completer above advanced the word point, but found no
matches.
*/
if ((text[0] == '-' || text[0] == '\0')
&& (!tracker.have_completions ()
|| tracker.custom_word_point () == saved_word_point))
{
tracker.set_custom_word_point (saved_word_point);
text = option_text;
if (found_probe_option == -1)
complete_on_enum (tracker, probe_options, text, text);
complete_on_enum (tracker, explicit_options, text, text);
}
}
/* The corresponding completer_handle_brkchars
implementation. */
static void
location_completer_handle_brkchars (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text,
const char *word_ignored)
{
tracker.set_use_custom_word_point (true);
location_completer (ignore, tracker, text, NULL);
}
/* Helper for expression_completer which recursively adds field and
method names from TYPE, a struct or union type, to the OUTPUT
list. */
static void
add_struct_fields (struct type *type, completion_list &output,
const char *fieldname, int namelen)
{
int i;
int computed_type_name = 0;
const char *type_name = NULL;
type = check_typedef (type);
for (i = 0; i < type->num_fields (); ++i)
{
if (i < TYPE_N_BASECLASSES (type))
add_struct_fields (TYPE_BASECLASS (type, i),
output, fieldname, namelen);
else if (TYPE_FIELD_NAME (type, i))
{
if (TYPE_FIELD_NAME (type, i)[0] != '\0')
{
if (! strncmp (TYPE_FIELD_NAME (type, i),
fieldname, namelen))
output.emplace_back (xstrdup (TYPE_FIELD_NAME (type, i)));
}
else if (type->field (i).type ()->code () == TYPE_CODE_UNION)
{
/* Recurse into anonymous unions. */
add_struct_fields (type->field (i).type (),
output, fieldname, namelen);
}
}
}
for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
{
const char *name = TYPE_FN_FIELDLIST_NAME (type, i);
if (name && ! strncmp (name, fieldname, namelen))
{
if (!computed_type_name)
{
type_name = type->name ();
computed_type_name = 1;
}
/* Omit constructors from the completion list. */
if (!type_name || strcmp (type_name, name))
output.emplace_back (xstrdup (name));
}
}
}
/* See completer.h. */
void
complete_expression (completion_tracker &tracker,
const char *text, const char *word)
{
struct type *type = NULL;
gdb::unique_xmalloc_ptr<char> fieldname;
enum type_code code = TYPE_CODE_UNDEF;
/* Perform a tentative parse of the expression, to see whether a
field completion is required. */
try
{
type = parse_expression_for_completion (text, &fieldname, &code);
}
catch (const gdb_exception_error &except)
{
return;
}
if (fieldname != nullptr && type)
{
for (;;)
{
type = check_typedef (type);
if (type->code () != TYPE_CODE_PTR && !TYPE_IS_REFERENCE (type))
break;
type = TYPE_TARGET_TYPE (type);
}
if (type->code () == TYPE_CODE_UNION
|| type->code () == TYPE_CODE_STRUCT)
{
completion_list result;
add_struct_fields (type, result, fieldname.get (),
strlen (fieldname.get ()));
tracker.add_completions (std::move (result));
return;
}
}
else if (fieldname != nullptr && code != TYPE_CODE_UNDEF)
{
collect_symbol_completion_matches_type (tracker, fieldname.get (),
fieldname.get (), code);
return;
}
complete_files_symbols (tracker, text, word);
}
/* Complete on expressions. Often this means completing on symbol
names, but some language parsers also have support for completing
field names. */
void
expression_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
complete_expression (tracker, text, word);
}
/* See definition in completer.h. */
void
set_rl_completer_word_break_characters (const char *break_chars)
{
rl_completer_word_break_characters = (char *) break_chars;
}
/* Complete on symbols. */
void
symbol_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
collect_symbol_completion_matches (tracker, complete_symbol_mode::EXPRESSION,
symbol_name_match_type::EXPRESSION,
text, word);
}
/* Here are some useful test cases for completion. FIXME: These
should be put in the test suite. They should be tested with both
M-? and TAB.
"show output-" "radix"
"show output" "-radix"
"p" ambiguous (commands starting with p--path, print, printf, etc.)
"p " ambiguous (all symbols)
"info t foo" no completions
"info t " no completions
"info t" ambiguous ("info target", "info terminal", etc.)
"info ajksdlfk" no completions
"info ajksdlfk " no completions
"info" " "
"info " ambiguous (all info commands)
"p \"a" no completions (string constant)
"p 'a" ambiguous (all symbols starting with a)
"p b-a" ambiguous (all symbols starting with a)
"p b-" ambiguous (all symbols)
"file Make" "file" (word break hard to screw up here)
"file ../gdb.stabs/we" "ird" (needs to not break word at slash)
*/
enum complete_line_internal_reason
{
/* Preliminary phase, called by gdb_completion_word_break_characters
function, is used to either:
#1 - Determine the set of chars that are word delimiters
depending on the current command in line_buffer.
#2 - Manually advance RL_POINT to the "word break" point instead
of letting readline do it (based on too-simple character
matching).
Simpler completers that just pass a brkchars array to readline
(#1 above) must defer generating the completions to the main
phase (below). No completion list should be generated in this
phase.
OTOH, completers that manually advance the word point(#2 above)
must set "use_custom_word_point" in the tracker and generate
their completion in this phase. Note that this is the convenient
thing to do since they'll be parsing the input line anyway. */
handle_brkchars,
/* Main phase, called by complete_line function, is used to get the
list of possible completions. */
handle_completions,
/* Special case when completing a 'help' command. In this case,
once sub-command completions are exhausted, we simply return
NULL. */
handle_help,
};
/* Helper for complete_line_internal to simplify it. */
static void
complete_line_internal_normal_command (completion_tracker &tracker,
const char *command, const char *word,
const char *cmd_args,
complete_line_internal_reason reason,
struct cmd_list_element *c)
{
const char *p = cmd_args;
if (c->completer == filename_completer)
{
/* Many commands which want to complete on file names accept
several file names, as in "run foo bar >>baz". So we don't
want to complete the entire text after the command, just the
last word. To this end, we need to find the beginning of the
file name by starting at `word' and going backwards. */
for (p = word;
p > command
&& strchr (gdb_completer_file_name_break_characters,
p[-1]) == NULL;
p--)
;
}
if (reason == handle_brkchars)
{
completer_handle_brkchars_ftype *brkchars_fn;
if (c->completer_handle_brkchars != NULL)
brkchars_fn = c->completer_handle_brkchars;
else
{
brkchars_fn
= (completer_handle_brkchars_func_for_completer
(c->completer));
}
brkchars_fn (c, tracker, p, word);
}
if (reason != handle_brkchars && c->completer != NULL)
(*c->completer) (c, tracker, p, word);
}
/* Internal function used to handle completions.
TEXT is the caller's idea of the "word" we are looking at.
LINE_BUFFER is available to be looked at; it contains the entire
text of the line. POINT is the offset in that line of the cursor.
You should pretend that the line ends at POINT.
See complete_line_internal_reason for description of REASON. */
static void
complete_line_internal_1 (completion_tracker &tracker,
const char *text,
const char *line_buffer, int point,
complete_line_internal_reason reason)
{
char *tmp_command;
const char *p;
int ignore_help_classes;
/* Pointer within tmp_command which corresponds to text. */
const char *word;
struct cmd_list_element *c, *result_list;
/* Choose the default set of word break characters to break
completions. If we later find out that we are doing completions
on command strings (as opposed to strings supplied by the
individual command completer functions, which can be any string)
then we will switch to the special word break set for command
strings, which leaves out the '-' and '.' character used in some
commands. */
set_rl_completer_word_break_characters
(current_language->word_break_characters ());
/* Decide whether to complete on a list of gdb commands or on
symbols. */
tmp_command = (char *) alloca (point + 1);
p = tmp_command;
/* The help command should complete help aliases. */
ignore_help_classes = reason != handle_help;
strncpy (tmp_command, line_buffer, point);
tmp_command[point] = '\0';
if (reason == handle_brkchars)
{
gdb_assert (text == NULL);
word = NULL;
}
else
{
/* Since text always contains some number of characters leading up
to point, we can find the equivalent position in tmp_command
by subtracting that many characters from the end of tmp_command. */
word = tmp_command + point - strlen (text);
}
/* Move P up to the start of the command. */
p = skip_spaces (p);
if (*p == '\0')
{
/* An empty line is ambiguous; that is, it could be any
command. */
c = CMD_LIST_AMBIGUOUS;
result_list = 0;
}
else
{
c = lookup_cmd_1 (&p, cmdlist, &result_list, NULL, ignore_help_classes);
}
/* Move p up to the next interesting thing. */
while (*p == ' ' || *p == '\t')
{
p++;
}
tracker.advance_custom_word_point_by (p - tmp_command);
if (!c)
{
/* It is an unrecognized command. So there are no
possible completions. */
}
else if (c == CMD_LIST_AMBIGUOUS)
{
const char *q;
/* lookup_cmd_1 advances p up to the first ambiguous thing, but
doesn't advance over that thing itself. Do so now. */
q = p;
while (valid_cmd_char_p (*q))
++q;
if (q != tmp_command + point)
{
/* There is something beyond the ambiguous
command, so there are no possible completions. For
example, "info t " or "info t foo" does not complete
to anything, because "info t" can be "info target" or
"info terminal". */
}
else
{
/* We're trying to complete on the command which was ambiguous.
This we can deal with. */
if (result_list)
{
if (reason != handle_brkchars)
complete_on_cmdlist (*result_list->prefixlist, tracker, p,
word, ignore_help_classes);
}
else
{
if (reason != handle_brkchars)
complete_on_cmdlist (cmdlist, tracker, p, word,
ignore_help_classes);
}
/* Ensure that readline does the right thing with respect to
inserting quotes. */
set_rl_completer_word_break_characters
(gdb_completer_command_word_break_characters);
}
}
else
{
/* We've recognized a full command. */
if (p == tmp_command + point)
{
/* There is no non-whitespace in the line beyond the
command. */
if (p[-1] == ' ' || p[-1] == '\t')
{
/* The command is followed by whitespace; we need to
complete on whatever comes after command. */
if (c->prefixlist)
{
/* It is a prefix command; what comes after it is
a subcommand (e.g. "info "). */
if (reason != handle_brkchars)
complete_on_cmdlist (*c->prefixlist, tracker, p, word,
ignore_help_classes);
/* Ensure that readline does the right thing
with respect to inserting quotes. */
set_rl_completer_word_break_characters
(gdb_completer_command_word_break_characters);
}
else if (reason == handle_help)
;
else if (c->enums)
{
if (reason != handle_brkchars)
complete_on_enum (tracker, c->enums, p, word);
set_rl_completer_word_break_characters
(gdb_completer_command_word_break_characters);
}
else
{
/* It is a normal command; what comes after it is
completed by the command's completer function. */
complete_line_internal_normal_command (tracker,
tmp_command, word, p,
reason, c);
}
}
else
{
/* The command is not followed by whitespace; we need to
complete on the command itself, e.g. "p" which is a
command itself but also can complete to "print", "ptype"
etc. */
const char *q;
/* Find the command we are completing on. */
q = p;
while (q > tmp_command)
{
if (valid_cmd_char_p (q[-1]))
--q;
else
break;
}
/* Move the custom word point back too. */
tracker.advance_custom_word_point_by (q - p);
if (reason != handle_brkchars)
complete_on_cmdlist (result_list, tracker, q, word,
ignore_help_classes);
/* Ensure that readline does the right thing
with respect to inserting quotes. */
set_rl_completer_word_break_characters
(gdb_completer_command_word_break_characters);
}
}
else if (reason == handle_help)
;
else
{
/* There is non-whitespace beyond the command. */
if (c->prefixlist && !c->allow_unknown)
{
/* It is an unrecognized subcommand of a prefix command,
e.g. "info adsfkdj". */
}
else if (c->enums)
{
if (reason != handle_brkchars)
complete_on_enum (tracker, c->enums, p, word);
}
else
{
/* It is a normal command. */
complete_line_internal_normal_command (tracker,
tmp_command, word, p,
reason, c);
}
}
}
}
/* Wrapper around complete_line_internal_1 to handle
MAX_COMPLETIONS_REACHED_ERROR. */
static void
complete_line_internal (completion_tracker &tracker,
const char *text,
const char *line_buffer, int point,
complete_line_internal_reason reason)
{
try
{
complete_line_internal_1 (tracker, text, line_buffer, point, reason);
}
catch (const gdb_exception_error &except)
{
if (except.error != MAX_COMPLETIONS_REACHED_ERROR)
throw;
}
}
/* See completer.h. */
int max_completions = 200;
/* Initial size of the table. It automagically grows from here. */
#define INITIAL_COMPLETION_HTAB_SIZE 200
/* See completer.h. */
completion_tracker::completion_tracker ()
{
discard_completions ();
}
/* See completer.h. */
void
completion_tracker::discard_completions ()
{
xfree (m_lowest_common_denominator);
m_lowest_common_denominator = NULL;
m_lowest_common_denominator_unique = false;
m_lowest_common_denominator_valid = false;
/* A null check here allows this function to be used from the
constructor. */
if (m_entries_hash != NULL)
htab_delete (m_entries_hash);
/* A callback used by the hash table to compare new entries with existing
entries. We can't use the standard streq_hash function here as the
key to our hash is just a single string, while the values we store in
the hash are a struct containing multiple strings. */
static auto entry_eq_func
= [] (const void *first, const void *second) -> int
{
/* The FIRST argument is the entry already in the hash table, and
the SECOND argument is the new item being inserted. */
const completion_hash_entry *entry
= (const completion_hash_entry *) first;
const char *name_str = (const char *) second;
return entry->is_name_eq (name_str);
};
/* Callback used by the hash table to compute the hash value for an
existing entry. This is needed when expanding the hash table. */
static auto entry_hash_func
= [] (const void *arg) -> hashval_t
{
const completion_hash_entry *entry
= (const completion_hash_entry *) arg;
return entry->hash_name ();
};
m_entries_hash = htab_create_alloc (INITIAL_COMPLETION_HTAB_SIZE,
entry_hash_func, entry_eq_func,
completion_hash_entry::deleter,
xcalloc, xfree);
}
/* See completer.h. */
completion_tracker::~completion_tracker ()
{
xfree (m_lowest_common_denominator);
htab_delete (m_entries_hash);
}
/* See completer.h. */
bool
completion_tracker::maybe_add_completion
(gdb::unique_xmalloc_ptr<char> name,
completion_match_for_lcd *match_for_lcd,
const char *text, const char *word)
{
void **slot;
if (max_completions == 0)
return false;
if (htab_elements (m_entries_hash) >= max_completions)
return false;
hashval_t hash = htab_hash_string (name.get ());
slot = htab_find_slot_with_hash (m_entries_hash, name.get (), hash, INSERT);
if (*slot == HTAB_EMPTY_ENTRY)
{
const char *match_for_lcd_str = NULL;
if (match_for_lcd != NULL)
match_for_lcd_str = match_for_lcd->finish ();
if (match_for_lcd_str == NULL)
match_for_lcd_str = name.get ();
gdb::unique_xmalloc_ptr<char> lcd
= make_completion_match_str (match_for_lcd_str, text, word);
size_t lcd_len = strlen (lcd.get ());
*slot = new completion_hash_entry (std::move (name), std::move (lcd));
m_lowest_common_denominator_valid = false;
m_lowest_common_denominator_max_length
= std::max (m_lowest_common_denominator_max_length, lcd_len);
}
return true;
}
/* See completer.h. */
void
completion_tracker::add_completion (gdb::unique_xmalloc_ptr<char> name,
completion_match_for_lcd *match_for_lcd,
const char *text, const char *word)
{
if (!maybe_add_completion (std::move (name), match_for_lcd, text, word))
throw_error (MAX_COMPLETIONS_REACHED_ERROR, _("Max completions reached."));
}
/* See completer.h. */
void
completion_tracker::add_completions (completion_list &&list)
{
for (auto &candidate : list)
add_completion (std::move (candidate));
}
/* See completer.h. */
void
completion_tracker::remove_completion (const char *name)
{
hashval_t hash = htab_hash_string (name);
if (htab_find_slot_with_hash (m_entries_hash, name, hash, NO_INSERT)
!= NULL)
{
htab_remove_elt_with_hash (m_entries_hash, name, hash);
m_lowest_common_denominator_valid = false;
}
}
/* Helper for the make_completion_match_str overloads. Returns NULL
as an indication that we want MATCH_NAME exactly. It is up to the
caller to xstrdup that string if desired. */
static char *
make_completion_match_str_1 (const char *match_name,
const char *text, const char *word)
{
char *newobj;
if (word == text)
{
/* Return NULL as an indication that we want MATCH_NAME
exactly. */
return NULL;
}
else if (word > text)
{
/* Return some portion of MATCH_NAME. */
newobj = xstrdup (match_name + (word - text));
}
else
{
/* Return some of WORD plus MATCH_NAME. */
size_t len = strlen (match_name);
newobj = (char *) xmalloc (text - word + len + 1);
memcpy (newobj, word, text - word);
memcpy (newobj + (text - word), match_name, len + 1);
}
return newobj;
}
/* See completer.h. */
gdb::unique_xmalloc_ptr<char>
make_completion_match_str (const char *match_name,
const char *text, const char *word)
{
char *newobj = make_completion_match_str_1 (match_name, text, word);
if (newobj == NULL)
newobj = xstrdup (match_name);
return gdb::unique_xmalloc_ptr<char> (newobj);
}
/* See completer.h. */
gdb::unique_xmalloc_ptr<char>
make_completion_match_str (gdb::unique_xmalloc_ptr<char> &&match_name,
const char *text, const char *word)
{
char *newobj = make_completion_match_str_1 (match_name.get (), text, word);
if (newobj == NULL)
return std::move (match_name);
return gdb::unique_xmalloc_ptr<char> (newobj);
}
/* See complete.h. */
completion_result
complete (const char *line, char const **word, int *quote_char)
{
completion_tracker tracker_handle_brkchars;
completion_tracker tracker_handle_completions;
completion_tracker *tracker;
/* The WORD should be set to the end of word to complete. We initialize
to the completion point which is assumed to be at the end of LINE.
This leaves WORD to be initialized to a sensible value in cases
completion_find_completion_word() fails i.e., throws an exception.
See bug 24587. */
*word = line + strlen (line);
try
{
*word = completion_find_completion_word (tracker_handle_brkchars,
line, quote_char);
/* Completers that provide a custom word point in the
handle_brkchars phase also compute their completions then.
Completers that leave the completion word handling to readline
must be called twice. */
if (tracker_handle_brkchars.use_custom_word_point ())
tracker = &tracker_handle_brkchars;
else
{
complete_line (tracker_handle_completions, *word, line, strlen (line));
tracker = &tracker_handle_completions;
}
}
catch (const gdb_exception &ex)
{
return {};
}
return tracker->build_completion_result (*word, *word - line, strlen (line));
}
/* Generate completions all at once. Does nothing if max_completions
is 0. If max_completions is non-negative, this will collect at
most max_completions strings.
TEXT is the caller's idea of the "word" we are looking at.
LINE_BUFFER is available to be looked at; it contains the entire
text of the line.
POINT is the offset in that line of the cursor. You
should pretend that the line ends at POINT. */
void
complete_line (completion_tracker &tracker,
const char *text, const char *line_buffer, int point)
{
if (max_completions == 0)
return;
complete_line_internal (tracker, text, line_buffer, point,
handle_completions);
}
/* Complete on command names. Used by "help". */
void
command_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
complete_line_internal (tracker, word, text,
strlen (text), handle_help);
}
/* The corresponding completer_handle_brkchars implementation. */
static void
command_completer_handle_brkchars (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
set_rl_completer_word_break_characters
(gdb_completer_command_word_break_characters);
}
/* Complete on signals. */
void
signal_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
size_t len = strlen (word);
int signum;
const char *signame;
for (signum = GDB_SIGNAL_FIRST; signum != GDB_SIGNAL_LAST; ++signum)
{
/* Can't handle this, so skip it. */
if (signum == GDB_SIGNAL_0)
continue;
signame = gdb_signal_to_name ((enum gdb_signal) signum);
/* Ignore the unknown signal case. */
if (!signame || strcmp (signame, "?") == 0)
continue;
if (strncasecmp (signame, word, len) == 0)
tracker.add_completion (make_unique_xstrdup (signame));
}
}
/* Bit-flags for selecting what the register and/or register-group
completer should complete on. */
enum reg_completer_target
{
complete_register_names = 0x1,
complete_reggroup_names = 0x2
};
DEF_ENUM_FLAGS_TYPE (enum reg_completer_target, reg_completer_targets);
/* Complete register names and/or reggroup names based on the value passed
in TARGETS. At least one bit in TARGETS must be set. */
static void
reg_or_group_completer_1 (completion_tracker &tracker,
const char *text, const char *word,
reg_completer_targets targets)
{
size_t len = strlen (word);
struct gdbarch *gdbarch;
const char *name;
gdb_assert ((targets & (complete_register_names
| complete_reggroup_names)) != 0);
gdbarch = get_current_arch ();
if ((targets & complete_register_names) != 0)
{
int i;
for (i = 0;
(name = user_reg_map_regnum_to_name (gdbarch, i)) != NULL;
i++)
{
if (*name != '\0' && strncmp (word, name, len) == 0)
tracker.add_completion (make_unique_xstrdup (name));
}
}
if ((targets & complete_reggroup_names) != 0)
{
struct reggroup *group;
for (group = reggroup_next (gdbarch, NULL);
group != NULL;
group = reggroup_next (gdbarch, group))
{
name = reggroup_name (group);
if (strncmp (word, name, len) == 0)
tracker.add_completion (make_unique_xstrdup (name));
}
}
}
/* Perform completion on register and reggroup names. */
void
reg_or_group_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
reg_or_group_completer_1 (tracker, text, word,
(complete_register_names
| complete_reggroup_names));
}
/* Perform completion on reggroup names. */
void
reggroup_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
reg_or_group_completer_1 (tracker, text, word,
complete_reggroup_names);
}
/* The default completer_handle_brkchars implementation. */
static void
default_completer_handle_brkchars (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
set_rl_completer_word_break_characters
(current_language->word_break_characters ());
}
/* See definition in completer.h. */
completer_handle_brkchars_ftype *
completer_handle_brkchars_func_for_completer (completer_ftype *fn)
{
if (fn == filename_completer)
return filename_completer_handle_brkchars;
if (fn == location_completer)
return location_completer_handle_brkchars;
if (fn == command_completer)
return command_completer_handle_brkchars;
return default_completer_handle_brkchars;
}
/* Used as brkchars when we want to tell readline we have a custom
word point. We do that by making our rl_completion_word_break_hook
set RL_POINT to the desired word point, and return the character at
the word break point as the break char. This is two bytes in order
to fit one break character plus the terminating null. */
static char gdb_custom_word_point_brkchars[2];
/* Since rl_basic_quote_characters is not completer-specific, we save
its original value here, in order to be able to restore it in
gdb_rl_attempted_completion_function. */
static const char *gdb_org_rl_basic_quote_characters = rl_basic_quote_characters;
/* Get the list of chars that are considered as word breaks
for the current command. */
static char *
gdb_completion_word_break_characters_throw ()
{
/* New completion starting. Get rid of the previous tracker and
start afresh. */
delete current_completion.tracker;
current_completion.tracker = new completion_tracker ();
completion_tracker &tracker = *current_completion.tracker;
complete_line_internal (tracker, NULL, rl_line_buffer,
rl_point, handle_brkchars);
if (tracker.use_custom_word_point ())
{
gdb_assert (tracker.custom_word_point () > 0);
rl_point = tracker.custom_word_point () - 1;
gdb_assert (rl_point >= 0 && rl_point < strlen (rl_line_buffer));
gdb_custom_word_point_brkchars[0] = rl_line_buffer[rl_point];
rl_completer_word_break_characters = gdb_custom_word_point_brkchars;
rl_completer_quote_characters = NULL;
/* Clear this too, so that if we're completing a quoted string,
readline doesn't consider the quote character a delimiter.
If we didn't do this, readline would auto-complete {b
'fun<tab>} to {'b 'function()'}, i.e., add the terminating
\', but, it wouldn't append the separator space either, which
is not desirable. So instead we take care of appending the
quote character to the LCD ourselves, in
gdb_rl_attempted_completion_function. Since this global is
not just completer-specific, we'll restore it back to the
default in gdb_rl_attempted_completion_function. */
rl_basic_quote_characters = NULL;
}
return rl_completer_word_break_characters;
}
char *
gdb_completion_word_break_characters ()
{
/* New completion starting. */
current_completion.aborted = false;
try
{
return gdb_completion_word_break_characters_throw ();
}
catch (const gdb_exception &ex)
{
/* Set this to that gdb_rl_attempted_completion_function knows
to abort early. */
current_completion.aborted = true;
}
return NULL;
}
/* See completer.h. */
const char *
completion_find_completion_word (completion_tracker &tracker, const char *text,
int *quote_char)
{
size_t point = strlen (text);
complete_line_internal (tracker, NULL, text, point, handle_brkchars);
if (tracker.use_custom_word_point ())
{
gdb_assert (tracker.custom_word_point () > 0);
*quote_char = tracker.quote_char ();
return text + tracker.custom_word_point ();
}
gdb_rl_completion_word_info info;
info.word_break_characters = rl_completer_word_break_characters;
info.quote_characters = gdb_completer_quote_characters;
info.basic_quote_characters = rl_basic_quote_characters;
return gdb_rl_find_completion_word (&info, quote_char, NULL, text);
}
/* See completer.h. */
void
completion_tracker::recompute_lcd_visitor (completion_hash_entry *entry)
{
if (!m_lowest_common_denominator_valid)
{
/* This is the first lowest common denominator that we are
considering, just copy it in. */
strcpy (m_lowest_common_denominator, entry->get_lcd ());
m_lowest_common_denominator_unique = true;
m_lowest_common_denominator_valid = true;
}
else
{
/* Find the common denominator between the currently-known lowest
common denominator and NEW_MATCH_UP. That becomes the new lowest
common denominator. */
size_t i;
const char *new_match = entry->get_lcd ();
for (i = 0;
(new_match[i] != '\0'
&& new_match[i] == m_lowest_common_denominator[i]);
i++)
;
if (m_lowest_common_denominator[i] != new_match[i])
{
m_lowest_common_denominator[i] = '\0';
m_lowest_common_denominator_unique = false;
}
}
}
/* See completer.h. */
void
completion_tracker::recompute_lowest_common_denominator ()
{
/* We've already done this. */
if (m_lowest_common_denominator_valid)
return;
/* Resize the storage to ensure we have enough space, the plus one gives
us space for the trailing null terminator we will include. */
m_lowest_common_denominator
= (char *) xrealloc (m_lowest_common_denominator,
m_lowest_common_denominator_max_length + 1);
/* Callback used to visit each entry in the m_entries_hash. */
auto visitor_func
= [] (void **slot, void *info) -> int
{
completion_tracker *obj = (completion_tracker *) info;
completion_hash_entry *entry = (completion_hash_entry *) *slot;
obj->recompute_lcd_visitor (entry);
return 1;
};
htab_traverse (m_entries_hash, visitor_func, this);
m_lowest_common_denominator_valid = true;
}
/* See completer.h. */
void
completion_tracker::advance_custom_word_point_by (int len)
{
m_custom_word_point += len;
}
/* Build a new C string that is a copy of LCD with the whitespace of
ORIG/ORIG_LEN preserved.
Say the user is completing a symbol name, with spaces, like:
"foo ( i"
and the resulting completion match is:
"foo(int)"
we want to end up with an input line like:
"foo ( int)"
^^^^^^^ => text from LCD [1], whitespace from ORIG preserved.
^^ => new text from LCD
[1] - We must take characters from the LCD instead of the original
text, since some completions want to change upper/lowercase. E.g.:
"handle sig<>"
completes to:
"handle SIG[QUIT|etc.]"
*/
static char *
expand_preserving_ws (const char *orig, size_t orig_len,
const char *lcd)
{
const char *p_orig = orig;
const char *orig_end = orig + orig_len;
const char *p_lcd = lcd;
std::string res;
while (p_orig < orig_end)
{
if (*p_orig == ' ')
{
while (p_orig < orig_end && *p_orig == ' ')
res += *p_orig++;
p_lcd = skip_spaces (p_lcd);
}
else
{
/* Take characters from the LCD instead of the original
text, since some completions change upper/lowercase.
E.g.:
"handle sig<>"
completes to:
"handle SIG[QUIT|etc.]"
*/
res += *p_lcd;
p_orig++;
p_lcd++;
}
}
while (*p_lcd != '\0')
res += *p_lcd++;
return xstrdup (res.c_str ());
}
/* See completer.h. */
completion_result
completion_tracker::build_completion_result (const char *text,
int start, int end)
{
size_t element_count = htab_elements (m_entries_hash);
if (element_count == 0)
return {};
/* +1 for the LCD, and +1 for NULL termination. */
char **match_list = XNEWVEC (char *, 1 + element_count + 1);
/* Build replacement word, based on the LCD. */
recompute_lowest_common_denominator ();
match_list[0]
= expand_preserving_ws (text, end - start,
m_lowest_common_denominator);
if (m_lowest_common_denominator_unique)
{
/* We don't rely on readline appending the quote char as
delimiter as then readline wouldn't append the ' ' after the
completion. */
char buf[2] = { (char) quote_char () };
match_list[0] = reconcat (match_list[0], match_list[0],
buf, (char *) NULL);
match_list[1] = NULL;
/* If the tracker wants to, or we already have a space at the
end of the match, tell readline to skip appending
another. */
bool completion_suppress_append
= (suppress_append_ws ()
|| match_list[0][strlen (match_list[0]) - 1] == ' ');
return completion_result (match_list, 1, completion_suppress_append);
}
else
{
/* State object used while building the completion list. */
struct list_builder
{
list_builder (char **ml)
: match_list (ml),
index (1)
{ /* Nothing. */ }
/* The list we are filling. */
char **match_list;
/* The next index in the list to write to. */
int index;
};
list_builder builder (match_list);
/* Visit each entry in m_entries_hash and add it to the completion
list, updating the builder state object. */
auto func
= [] (void **slot, void *info) -> int
{
completion_hash_entry *entry = (completion_hash_entry *) *slot;
list_builder *state = (list_builder *) info;
state->match_list[state->index] = entry->release_name ();
state->index++;
return 1;
};
/* Build the completion list and add a null at the end. */
htab_traverse_noresize (m_entries_hash, func, &builder);
match_list[builder.index] = NULL;
return completion_result (match_list, builder.index - 1, false);
}
}
/* See completer.h */
completion_result::completion_result ()
: match_list (NULL), number_matches (0),
completion_suppress_append (false)
{}
/* See completer.h */
completion_result::completion_result (char **match_list_,
size_t number_matches_,
bool completion_suppress_append_)
: match_list (match_list_),
number_matches (number_matches_),
completion_suppress_append (completion_suppress_append_)
{}
/* See completer.h */
completion_result::~completion_result ()
{
reset_match_list ();
}
/* See completer.h */
completion_result::completion_result (completion_result &&rhs) noexcept
: match_list (rhs.match_list),
number_matches (rhs.number_matches)
{
rhs.match_list = NULL;
rhs.number_matches = 0;
}
/* See completer.h */
char **
completion_result::release_match_list ()
{
char **ret = match_list;
match_list = NULL;
return ret;
}
/* See completer.h */
void
completion_result::sort_match_list ()
{
if (number_matches > 1)
{
/* Element 0 is special (it's the common prefix), leave it
be. */
std::sort (&match_list[1],
&match_list[number_matches + 1],
compare_cstrings);
}
}
/* See completer.h */
void
completion_result::reset_match_list ()
{
if (match_list != NULL)
{
for (char **p = match_list; *p != NULL; p++)
xfree (*p);
xfree (match_list);
match_list = NULL;
}
}
/* Helper for gdb_rl_attempted_completion_function, which does most of
the work. This is called by readline to build the match list array
and to determine the lowest common denominator. The real matches
list starts at match[1], while match[0] is the slot holding
readline's idea of the lowest common denominator of all matches,
which is what readline replaces the completion "word" with.
TEXT is the caller's idea of the "word" we are looking at, as
computed in the handle_brkchars phase.
START is the offset from RL_LINE_BUFFER where TEXT starts. END is
the offset from RL_LINE_BUFFER where TEXT ends (i.e., where
rl_point is).
You should thus pretend that the line ends at END (relative to
RL_LINE_BUFFER).
RL_LINE_BUFFER contains the entire text of the line. RL_POINT is
the offset in that line of the cursor. You should pretend that the
line ends at POINT.
Returns NULL if there are no completions. */
static char **
gdb_rl_attempted_completion_function_throw (const char *text, int start, int end)
{
/* Completers that provide a custom word point in the
handle_brkchars phase also compute their completions then.
Completers that leave the completion word handling to readline
must be called twice. If rl_point (i.e., END) is at column 0,
then readline skips the handle_brkchars phase, and so we create a
tracker now in that case too. */
if (end == 0 || !current_completion.tracker->use_custom_word_point ())
{
delete current_completion.tracker;
current_completion.tracker = new completion_tracker ();
complete_line (*current_completion.tracker, text,
rl_line_buffer, rl_point);
}
completion_tracker &tracker = *current_completion.tracker;
completion_result result
= tracker.build_completion_result (text, start, end);
rl_completion_suppress_append = result.completion_suppress_append;
return result.release_match_list ();
}
/* Function installed as "rl_attempted_completion_function" readline
hook. Wrapper around gdb_rl_attempted_completion_function_throw
that catches C++ exceptions, which can't cross readline. */
char **
gdb_rl_attempted_completion_function (const char *text, int start, int end)
{
/* Restore globals that might have been tweaked in
gdb_completion_word_break_characters. */
rl_basic_quote_characters = gdb_org_rl_basic_quote_characters;
/* If we end up returning NULL, either on error, or simple because
there are no matches, inhibit readline's default filename
completer. */
rl_attempted_completion_over = 1;
/* If the handle_brkchars phase was aborted, don't try
completing. */
if (current_completion.aborted)
return NULL;
try
{
return gdb_rl_attempted_completion_function_throw (text, start, end);
}
catch (const gdb_exception &ex)
{
}
return NULL;
}
/* Skip over the possibly quoted word STR (as defined by the quote
characters QUOTECHARS and the word break characters BREAKCHARS).
Returns pointer to the location after the "word". If either
QUOTECHARS or BREAKCHARS is NULL, use the same values used by the
completer. */
const char *
skip_quoted_chars (const char *str, const char *quotechars,
const char *breakchars)
{
char quote_char = '\0';
const char *scan;
if (quotechars == NULL)
quotechars = gdb_completer_quote_characters;
if (breakchars == NULL)
breakchars = current_language->word_break_characters ();
for (scan = str; *scan != '\0'; scan++)
{
if (quote_char != '\0')
{
/* Ignore everything until the matching close quote char. */
if (*scan == quote_char)
{
/* Found matching close quote. */
scan++;
break;
}
}
else if (strchr (quotechars, *scan))
{
/* Found start of a quoted string. */
quote_char = *scan;
}
else if (strchr (breakchars, *scan))
{
break;
}
}
return (scan);
}
/* Skip over the possibly quoted word STR (as defined by the quote
characters and word break characters used by the completer).
Returns pointer to the location after the "word". */
const char *
skip_quoted (const char *str)
{
return skip_quoted_chars (str, NULL, NULL);
}
/* Return a message indicating that the maximum number of completions
has been reached and that there may be more. */
const char *
get_max_completions_reached_message (void)
{
return _("*** List may be truncated, max-completions reached. ***");
}
/* GDB replacement for rl_display_match_list.
Readline doesn't provide a clean interface for TUI(curses).
A hack previously used was to send readline's rl_outstream through a pipe
and read it from the event loop. Bleah. IWBN if readline abstracted
away all the necessary bits, and this is what this code does. It
replicates the parts of readline we need and then adds an abstraction
layer, currently implemented as struct match_list_displayer, so that both
CLI and TUI can use it. We copy all this readline code to minimize
GDB-specific mods to readline. Once this code performs as desired then
we can submit it to the readline maintainers.
N.B. A lot of the code is the way it is in order to minimize differences
from readline's copy. */
/* Not supported here. */
#undef VISIBLE_STATS
#if defined (HANDLE_MULTIBYTE)
#define MB_INVALIDCH(x) ((x) == (size_t)-1 || (x) == (size_t)-2)
#define MB_NULLWCH(x) ((x) == 0)
#endif
#define ELLIPSIS_LEN 3
/* gdb version of readline/complete.c:get_y_or_n.
'y' -> returns 1, and 'n' -> returns 0.
Also supported: space == 'y', RUBOUT == 'n', ctrl-g == start over.
If FOR_PAGER is non-zero, then also supported are:
NEWLINE or RETURN -> returns 2, and 'q' -> returns 0. */
static int
gdb_get_y_or_n (int for_pager, const struct match_list_displayer *displayer)
{
int c;
for (;;)
{
RL_SETSTATE (RL_STATE_MOREINPUT);
c = displayer->read_key (displayer);
RL_UNSETSTATE (RL_STATE_MOREINPUT);
if (c == 'y' || c == 'Y' || c == ' ')
return 1;
if (c == 'n' || c == 'N' || c == RUBOUT)
return 0;
if (c == ABORT_CHAR || c < 0)
{
/* Readline doesn't erase_entire_line here, but without it the
--More-- prompt isn't erased and neither is the text entered
thus far redisplayed. */
displayer->erase_entire_line (displayer);
/* Note: The arguments to rl_abort are ignored. */
rl_abort (0, 0);
}
if (for_pager && (c == NEWLINE || c == RETURN))
return 2;
if (for_pager && (c == 'q' || c == 'Q'))
return 0;
displayer->beep (displayer);
}
}
/* Pager function for tab-completion.
This is based on readline/complete.c:_rl_internal_pager.
LINES is the number of lines of output displayed thus far.
Returns:
-1 -> user pressed 'n' or equivalent,
0 -> user pressed 'y' or equivalent,
N -> user pressed NEWLINE or equivalent and N is LINES - 1. */
static int
gdb_display_match_list_pager (int lines,
const struct match_list_displayer *displayer)
{
int i;
displayer->puts (displayer, "--More--");
displayer->flush (displayer);
i = gdb_get_y_or_n (1, displayer);
displayer->erase_entire_line (displayer);
if (i == 0)
return -1;
else if (i == 2)
return (lines - 1);
else
return 0;
}
/* Return non-zero if FILENAME is a directory.
Based on readline/complete.c:path_isdir. */
static int
gdb_path_isdir (const char *filename)
{
struct stat finfo;
return (stat (filename, &finfo) == 0 && S_ISDIR (finfo.st_mode));
}
/* Return the portion of PATHNAME that should be output when listing
possible completions. If we are hacking filename completion, we
are only interested in the basename, the portion following the
final slash. Otherwise, we return what we were passed. Since
printing empty strings is not very informative, if we're doing
filename completion, and the basename is the empty string, we look
for the previous slash and return the portion following that. If
there's no previous slash, we just return what we were passed.
Based on readline/complete.c:printable_part. */
static char *
gdb_printable_part (char *pathname)
{
char *temp, *x;
if (rl_filename_completion_desired == 0) /* don't need to do anything */
return (pathname);
temp = strrchr (pathname, '/');
#if defined (__MSDOS__)
if (temp == 0 && ISALPHA ((unsigned char)pathname[0]) && pathname[1] == ':')
temp = pathname + 1;
#endif
if (temp == 0 || *temp == '\0')
return (pathname);
/* If the basename is NULL, we might have a pathname like '/usr/src/'.
Look for a previous slash and, if one is found, return the portion
following that slash. If there's no previous slash, just return the
pathname we were passed. */
else if (temp[1] == '\0')
{
for (x = temp - 1; x > pathname; x--)
if (*x == '/')
break;
return ((*x == '/') ? x + 1 : pathname);
}
else
return ++temp;
}
/* Compute width of STRING when displayed on screen by print_filename.
Based on readline/complete.c:fnwidth. */
static int
gdb_fnwidth (const char *string)
{
int width, pos;
#if defined (HANDLE_MULTIBYTE)
mbstate_t ps;
int left, w;
size_t clen;
wchar_t wc;
left = strlen (string) + 1;
memset (&ps, 0, sizeof (mbstate_t));
#endif
width = pos = 0;
while (string[pos])
{
if (CTRL_CHAR (string[pos]) || string[pos] == RUBOUT)
{
width += 2;
pos++;
}
else
{
#if defined (HANDLE_MULTIBYTE)
clen = mbrtowc (&wc, string + pos, left - pos, &ps);
if (MB_INVALIDCH (clen))
{
width++;
pos++;
memset (&ps, 0, sizeof (mbstate_t));
}
else if (MB_NULLWCH (clen))
break;
else
{
pos += clen;
w = wcwidth (wc);
width += (w >= 0) ? w : 1;
}
#else
width++;
pos++;
#endif
}
}
return width;
}
/* Print TO_PRINT, one matching completion.
PREFIX_BYTES is number of common prefix bytes.
Based on readline/complete.c:fnprint. */
static int
gdb_fnprint (const char *to_print, int prefix_bytes,
const struct match_list_displayer *displayer)
{
int printed_len, w;
const char *s;
#if defined (HANDLE_MULTIBYTE)
mbstate_t ps;
const char *end;
size_t tlen;
int width;
wchar_t wc;
end = to_print + strlen (to_print) + 1;
memset (&ps, 0, sizeof (mbstate_t));
#endif
printed_len = 0;
/* Don't print only the ellipsis if the common prefix is one of the
possible completions */
if (to_print[prefix_bytes] == '\0')
prefix_bytes = 0;
if (prefix_bytes)
{
char ellipsis;
ellipsis = (to_print[prefix_bytes] == '.') ? '_' : '.';
for (w = 0; w < ELLIPSIS_LEN; w++)
displayer->putch (displayer, ellipsis);
printed_len = ELLIPSIS_LEN;
}
s = to_print + prefix_bytes;
while (*s)
{
if (CTRL_CHAR (*s))
{
displayer->putch (displayer, '^');
displayer->putch (displayer, UNCTRL (*s));
printed_len += 2;
s++;
#if defined (HANDLE_MULTIBYTE)
memset (&ps, 0, sizeof (mbstate_t));
#endif
}
else if (*s == RUBOUT)
{
displayer->putch (displayer, '^');
displayer->putch (displayer, '?');
printed_len += 2;
s++;
#if defined (HANDLE_MULTIBYTE)
memset (&ps, 0, sizeof (mbstate_t));
#endif
}
else
{
#if defined (HANDLE_MULTIBYTE)
tlen = mbrtowc (&wc, s, end - s, &ps);
if (MB_INVALIDCH (tlen))
{
tlen = 1;
width = 1;
memset (&ps, 0, sizeof (mbstate_t));
}
else if (MB_NULLWCH (tlen))
break;
else
{
w = wcwidth (wc);
width = (w >= 0) ? w : 1;
}
for (w = 0; w < tlen; ++w)
displayer->putch (displayer, s[w]);
s += tlen;
printed_len += width;
#else
displayer->putch (displayer, *s);
s++;
printed_len++;
#endif
}
}
return printed_len;
}
/* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and we
are using it, check for and output a single character for `special'
filenames. Return the number of characters we output.
Based on readline/complete.c:print_filename. */
static int
gdb_print_filename (char *to_print, char *full_pathname, int prefix_bytes,
const struct match_list_displayer *displayer)
{
int printed_len, extension_char, slen, tlen;
char *s, c, *new_full_pathname;
const char *dn;
extern int _rl_complete_mark_directories;
extension_char = 0;
printed_len = gdb_fnprint (to_print, prefix_bytes, displayer);
#if defined (VISIBLE_STATS)
if (rl_filename_completion_desired && (rl_visible_stats || _rl_complete_mark_directories))
#else
if (rl_filename_completion_desired && _rl_complete_mark_directories)
#endif
{
/* If to_print != full_pathname, to_print is the basename of the
path passed. In this case, we try to expand the directory
name before checking for the stat character. */
if (to_print != full_pathname)
{
/* Terminate the directory name. */
c = to_print[-1];
to_print[-1] = '\0';
/* If setting the last slash in full_pathname to a NUL results in
full_pathname being the empty string, we are trying to complete
files in the root directory. If we pass a null string to the
bash directory completion hook, for example, it will expand it
to the current directory. We just want the `/'. */
if (full_pathname == 0 || *full_pathname == 0)
dn = "/";
else if (full_pathname[0] != '/')
dn = full_pathname;
else if (full_pathname[1] == 0)
dn = "//"; /* restore trailing slash to `//' */
else if (full_pathname[1] == '/' && full_pathname[2] == 0)
dn = "/"; /* don't turn /// into // */
else
dn = full_pathname;
s = tilde_expand (dn);
if (rl_directory_completion_hook)
(*rl_directory_completion_hook) (&s);
slen = strlen (s);
tlen = strlen (to_print);
new_full_pathname = (char *)xmalloc (slen + tlen + 2);
strcpy (new_full_pathname, s);
if (s[slen - 1] == '/')
slen--;
else
new_full_pathname[slen] = '/';
new_full_pathname[slen] = '/';
strcpy (new_full_pathname + slen + 1, to_print);
#if defined (VISIBLE_STATS)
if (rl_visible_stats)
extension_char = stat_char (new_full_pathname);
else
#endif
if (gdb_path_isdir (new_full_pathname))
extension_char = '/';
xfree (new_full_pathname);
to_print[-1] = c;
}
else
{
s = tilde_expand (full_pathname);
#if defined (VISIBLE_STATS)
if (rl_visible_stats)
extension_char = stat_char (s);
else
#endif
if (gdb_path_isdir (s))
extension_char = '/';
}
xfree (s);
if (extension_char)
{
displayer->putch (displayer, extension_char);
printed_len++;
}
}
return printed_len;
}
/* GDB version of readline/complete.c:complete_get_screenwidth. */
static int
gdb_complete_get_screenwidth (const struct match_list_displayer *displayer)
{
/* Readline has other stuff here which it's not clear we need. */
return displayer->width;
}
extern int _rl_completion_prefix_display_length;
extern int _rl_print_completions_horizontally;
EXTERN_C int _rl_qsort_string_compare (const void *, const void *);
typedef int QSFUNC (const void *, const void *);
/* GDB version of readline/complete.c:rl_display_match_list.
See gdb_display_match_list for a description of MATCHES, LEN, MAX.
Returns non-zero if all matches are displayed. */
static int
gdb_display_match_list_1 (char **matches, int len, int max,
const struct match_list_displayer *displayer)
{
int count, limit, printed_len, lines, cols;
int i, j, k, l, common_length, sind;
char *temp, *t;
int page_completions = displayer->height != INT_MAX && pagination_enabled;
/* Find the length of the prefix common to all items: length as displayed
characters (common_length) and as a byte index into the matches (sind) */
common_length = sind = 0;
if (_rl_completion_prefix_display_length > 0)
{
t = gdb_printable_part (matches[0]);
temp = strrchr (t, '/');
common_length = temp ? gdb_fnwidth (temp) : gdb_fnwidth (t);
sind = temp ? strlen (temp) : strlen (t);
if (common_length > _rl_completion_prefix_display_length && common_length > ELLIPSIS_LEN)
max -= common_length - ELLIPSIS_LEN;
else
common_length = sind = 0;
}
/* How many items of MAX length can we fit in the screen window? */
cols = gdb_complete_get_screenwidth (displayer);
max += 2;
limit = cols / max;
if (limit != 1 && (limit * max == cols))
limit--;
/* If cols == 0, limit will end up -1 */
if (cols < displayer->width && limit < 0)
limit = 1;
/* Avoid a possible floating exception. If max > cols,
limit will be 0 and a divide-by-zero fault will result. */
if (limit == 0)
limit = 1;
/* How many iterations of the printing loop? */
count = (len + (limit - 1)) / limit;
/* Watch out for special case. If LEN is less than LIMIT, then
just do the inner printing loop.
0 < len <= limit implies count = 1. */
/* Sort the items if they are not already sorted. */
if (rl_ignore_completion_duplicates == 0 && rl_sort_completion_matches)
qsort (matches + 1, len, sizeof (char *), (QSFUNC *)_rl_qsort_string_compare);
displayer->crlf (displayer);
lines = 0;
if (_rl_print_completions_horizontally == 0)
{
/* Print the sorted items, up-and-down alphabetically, like ls. */
for (i = 1; i <= count; i++)
{
for (j = 0, l = i; j < limit; j++)
{
if (l > len || matches[l] == 0)
break;
else
{
temp = gdb_printable_part (matches[l]);
printed_len = gdb_print_filename (temp, matches[l], sind,
displayer);
if (j + 1 < limit)
for (k = 0; k < max - printed_len; k++)
displayer->putch (displayer, ' ');
}
l += count;
}
displayer->crlf (displayer);
lines++;
if (page_completions && lines >= (displayer->height - 1) && i < count)
{
lines = gdb_display_match_list_pager (lines, displayer);
if (lines < 0)
return 0;
}
}
}
else
{
/* Print the sorted items, across alphabetically, like ls -x. */
for (i = 1; matches[i]; i++)
{
temp = gdb_printable_part (matches[i]);
printed_len = gdb_print_filename (temp, matches[i], sind, displayer);
/* Have we reached the end of this line? */
if (matches[i+1])
{
if (i && (limit > 1) && (i % limit) == 0)
{
displayer->crlf (displayer);
lines++;
if (page_completions && lines >= displayer->height - 1)
{
lines = gdb_display_match_list_pager (lines, displayer);
if (lines < 0)
return 0;
}
}
else
for (k = 0; k < max - printed_len; k++)
displayer->putch (displayer, ' ');
}
}
displayer->crlf (displayer);
}
return 1;
}
/* Utility for displaying completion list matches, used by both CLI and TUI.
MATCHES is the list of strings, in argv format, LEN is the number of
strings in MATCHES, and MAX is the length of the longest string in
MATCHES. */
void
gdb_display_match_list (char **matches, int len, int max,
const struct match_list_displayer *displayer)
{
/* Readline will never call this if complete_line returned NULL. */
gdb_assert (max_completions != 0);
/* complete_line will never return more than this. */
if (max_completions > 0)
gdb_assert (len <= max_completions);
if (rl_completion_query_items > 0 && len >= rl_completion_query_items)
{
char msg[100];
/* We can't use *query here because they wait for <RET> which is
wrong here. This follows the readline version as closely as possible
for compatibility's sake. See readline/complete.c. */
displayer->crlf (displayer);
xsnprintf (msg, sizeof (msg),
"Display all %d possibilities? (y or n)", len);
displayer->puts (displayer, msg);
displayer->flush (displayer);
if (gdb_get_y_or_n (0, displayer) == 0)
{
displayer->crlf (displayer);
return;
}
}
if (gdb_display_match_list_1 (matches, len, max, displayer))
{
/* Note: MAX_COMPLETIONS may be -1 or zero, but LEN is always > 0. */
if (len == max_completions)
{
/* The maximum number of completions has been reached. Warn the user
that there may be more. */
const char *message = get_max_completions_reached_message ();
displayer->puts (displayer, message);
displayer->crlf (displayer);
}
}
}
void _initialize_completer ();
void
_initialize_completer ()
{
add_setshow_zuinteger_unlimited_cmd ("max-completions", no_class,
&max_completions, _("\
Set maximum number of completion candidates."), _("\
Show maximum number of completion candidates."), _("\
Use this to limit the number of candidates considered\n\
during completion. Specifying \"unlimited\" or -1\n\
disables limiting. Note that setting either no limit or\n\
a very large limit can make completion slow."),
NULL, NULL, &setlist, &showlist);
}
|