1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450
|
// script.cc -- handle linker scripts for gold.
// Copyright (C) 2006-2018 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include "gold.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fnmatch.h>
#include <string>
#include <vector>
#include "filenames.h"
#include "elfcpp.h"
#include "demangle.h"
#include "dirsearch.h"
#include "options.h"
#include "fileread.h"
#include "workqueue.h"
#include "readsyms.h"
#include "parameters.h"
#include "layout.h"
#include "symtab.h"
#include "target-select.h"
#include "script.h"
#include "script-c.h"
#include "incremental.h"
namespace gold
{
// A token read from a script file. We don't implement keywords here;
// all keywords are simply represented as a string.
class Token
{
public:
// Token classification.
enum Classification
{
// Token is invalid.
TOKEN_INVALID,
// Token indicates end of input.
TOKEN_EOF,
// Token is a string of characters.
TOKEN_STRING,
// Token is a quoted string of characters.
TOKEN_QUOTED_STRING,
// Token is an operator.
TOKEN_OPERATOR,
// Token is a number (an integer).
TOKEN_INTEGER
};
// We need an empty constructor so that we can put this STL objects.
Token()
: classification_(TOKEN_INVALID), value_(NULL), value_length_(0),
opcode_(0), lineno_(0), charpos_(0)
{ }
// A general token with no value.
Token(Classification classification, int lineno, int charpos)
: classification_(classification), value_(NULL), value_length_(0),
opcode_(0), lineno_(lineno), charpos_(charpos)
{
gold_assert(classification == TOKEN_INVALID
|| classification == TOKEN_EOF);
}
// A general token with a value.
Token(Classification classification, const char* value, size_t length,
int lineno, int charpos)
: classification_(classification), value_(value), value_length_(length),
opcode_(0), lineno_(lineno), charpos_(charpos)
{
gold_assert(classification != TOKEN_INVALID
&& classification != TOKEN_EOF);
}
// A token representing an operator.
Token(int opcode, int lineno, int charpos)
: classification_(TOKEN_OPERATOR), value_(NULL), value_length_(0),
opcode_(opcode), lineno_(lineno), charpos_(charpos)
{ }
// Return whether the token is invalid.
bool
is_invalid() const
{ return this->classification_ == TOKEN_INVALID; }
// Return whether this is an EOF token.
bool
is_eof() const
{ return this->classification_ == TOKEN_EOF; }
// Return the token classification.
Classification
classification() const
{ return this->classification_; }
// Return the line number at which the token starts.
int
lineno() const
{ return this->lineno_; }
// Return the character position at this the token starts.
int
charpos() const
{ return this->charpos_; }
// Get the value of a token.
const char*
string_value(size_t* length) const
{
gold_assert(this->classification_ == TOKEN_STRING
|| this->classification_ == TOKEN_QUOTED_STRING);
*length = this->value_length_;
return this->value_;
}
int
operator_value() const
{
gold_assert(this->classification_ == TOKEN_OPERATOR);
return this->opcode_;
}
uint64_t
integer_value() const;
private:
// The token classification.
Classification classification_;
// The token value, for TOKEN_STRING or TOKEN_QUOTED_STRING or
// TOKEN_INTEGER.
const char* value_;
// The length of the token value.
size_t value_length_;
// The token value, for TOKEN_OPERATOR.
int opcode_;
// The line number where this token started (one based).
int lineno_;
// The character position within the line where this token started
// (one based).
int charpos_;
};
// Return the value of a TOKEN_INTEGER.
uint64_t
Token::integer_value() const
{
gold_assert(this->classification_ == TOKEN_INTEGER);
size_t len = this->value_length_;
uint64_t multiplier = 1;
char last = this->value_[len - 1];
if (last == 'm' || last == 'M')
{
multiplier = 1024 * 1024;
--len;
}
else if (last == 'k' || last == 'K')
{
multiplier = 1024;
--len;
}
char *end;
uint64_t ret = strtoull(this->value_, &end, 0);
gold_assert(static_cast<size_t>(end - this->value_) == len);
return ret * multiplier;
}
// This class handles lexing a file into a sequence of tokens.
class Lex
{
public:
// We unfortunately have to support different lexing modes, because
// when reading different parts of a linker script we need to parse
// things differently.
enum Mode
{
// Reading an ordinary linker script.
LINKER_SCRIPT,
// Reading an expression in a linker script.
EXPRESSION,
// Reading a version script.
VERSION_SCRIPT,
// Reading a --dynamic-list file.
DYNAMIC_LIST
};
Lex(const char* input_string, size_t input_length, int parsing_token)
: input_string_(input_string), input_length_(input_length),
current_(input_string), mode_(LINKER_SCRIPT),
first_token_(parsing_token), token_(),
lineno_(1), linestart_(input_string)
{ }
// Read a file into a string.
static void
read_file(Input_file*, std::string*);
// Return the next token.
const Token*
next_token();
// Return the current lexing mode.
Lex::Mode
mode() const
{ return this->mode_; }
// Set the lexing mode.
void
set_mode(Mode mode)
{ this->mode_ = mode; }
private:
Lex(const Lex&);
Lex& operator=(const Lex&);
// Make a general token with no value at the current location.
Token
make_token(Token::Classification c, const char* start) const
{ return Token(c, this->lineno_, start - this->linestart_ + 1); }
// Make a general token with a value at the current location.
Token
make_token(Token::Classification c, const char* v, size_t len,
const char* start)
const
{ return Token(c, v, len, this->lineno_, start - this->linestart_ + 1); }
// Make an operator token at the current location.
Token
make_token(int opcode, const char* start) const
{ return Token(opcode, this->lineno_, start - this->linestart_ + 1); }
// Make an invalid token at the current location.
Token
make_invalid_token(const char* start)
{ return this->make_token(Token::TOKEN_INVALID, start); }
// Make an EOF token at the current location.
Token
make_eof_token(const char* start)
{ return this->make_token(Token::TOKEN_EOF, start); }
// Return whether C can be the first character in a name. C2 is the
// next character, since we sometimes need that.
inline bool
can_start_name(char c, char c2);
// If C can appear in a name which has already started, return a
// pointer to a character later in the token or just past
// it. Otherwise, return NULL.
inline const char*
can_continue_name(const char* c);
// Return whether C, C2, C3 can start a hex number.
inline bool
can_start_hex(char c, char c2, char c3);
// If C can appear in a hex number which has already started, return
// a pointer to a character later in the token or just past
// it. Otherwise, return NULL.
inline const char*
can_continue_hex(const char* c);
// Return whether C can start a non-hex number.
static inline bool
can_start_number(char c);
// If C can appear in a decimal number which has already started,
// return a pointer to a character later in the token or just past
// it. Otherwise, return NULL.
inline const char*
can_continue_number(const char* c)
{ return Lex::can_start_number(*c) ? c + 1 : NULL; }
// If C1 C2 C3 form a valid three character operator, return the
// opcode. Otherwise return 0.
static inline int
three_char_operator(char c1, char c2, char c3);
// If C1 C2 form a valid two character operator, return the opcode.
// Otherwise return 0.
static inline int
two_char_operator(char c1, char c2);
// If C1 is a valid one character operator, return the opcode.
// Otherwise return 0.
static inline int
one_char_operator(char c1);
// Read the next token.
Token
get_token(const char**);
// Skip a C style /* */ comment. Return false if the comment did
// not end.
bool
skip_c_comment(const char**);
// Skip a line # comment. Return false if there was no newline.
bool
skip_line_comment(const char**);
// Build a token CLASSIFICATION from all characters that match
// CAN_CONTINUE_FN. The token starts at START. Start matching from
// MATCH. Set *PP to the character following the token.
inline Token
gather_token(Token::Classification,
const char* (Lex::*can_continue_fn)(const char*),
const char* start, const char* match, const char** pp);
// Build a token from a quoted string.
Token
gather_quoted_string(const char** pp);
// The string we are tokenizing.
const char* input_string_;
// The length of the string.
size_t input_length_;
// The current offset into the string.
const char* current_;
// The current lexing mode.
Mode mode_;
// The code to use for the first token. This is set to 0 after it
// is used.
int first_token_;
// The current token.
Token token_;
// The current line number.
int lineno_;
// The start of the current line in the string.
const char* linestart_;
};
// Read the whole file into memory. We don't expect linker scripts to
// be large, so we just use a std::string as a buffer. We ignore the
// data we've already read, so that we read aligned buffers.
void
Lex::read_file(Input_file* input_file, std::string* contents)
{
off_t filesize = input_file->file().filesize();
contents->clear();
contents->reserve(filesize);
off_t off = 0;
unsigned char buf[BUFSIZ];
while (off < filesize)
{
off_t get = BUFSIZ;
if (get > filesize - off)
get = filesize - off;
input_file->file().read(off, get, buf);
contents->append(reinterpret_cast<char*>(&buf[0]), get);
off += get;
}
}
// Return whether C can be the start of a name, if the next character
// is C2. A name can being with a letter, underscore, period, or
// dollar sign. Because a name can be a file name, we also permit
// forward slash, backslash, and tilde. Tilde is the tricky case
// here; GNU ld also uses it as a bitwise not operator. It is only
// recognized as the operator if it is not immediately followed by
// some character which can appear in a symbol. That is, when we
// don't know that we are looking at an expression, "~0" is a file
// name, and "~ 0" is an expression using bitwise not. We are
// compatible.
inline bool
Lex::can_start_name(char c, char c2)
{
switch (c)
{
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
case '_': case '.': case '$':
return true;
case '/': case '\\':
return this->mode_ == LINKER_SCRIPT;
case '~':
return this->mode_ == LINKER_SCRIPT && can_continue_name(&c2);
case '*': case '[':
return (this->mode_ == VERSION_SCRIPT
|| this->mode_ == DYNAMIC_LIST
|| (this->mode_ == LINKER_SCRIPT
&& can_continue_name(&c2)));
default:
return false;
}
}
// Return whether C can continue a name which has already started.
// Subsequent characters in a name are the same as the leading
// characters, plus digits and "=+-:[],?*". So in general the linker
// script language requires spaces around operators, unless we know
// that we are parsing an expression.
inline const char*
Lex::can_continue_name(const char* c)
{
switch (*c)
{
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
case 'M': case 'N': case 'O': case 'Q': case 'P': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
case 'm': case 'n': case 'o': case 'q': case 'p': case 'r':
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
case '_': case '.': case '$':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return c + 1;
// TODO(csilvers): why not allow ~ in names for version-scripts?
case '/': case '\\': case '~':
case '=': case '+':
case ',':
if (this->mode_ == LINKER_SCRIPT)
return c + 1;
return NULL;
case '[': case ']': case '*': case '?': case '-':
if (this->mode_ == LINKER_SCRIPT || this->mode_ == VERSION_SCRIPT
|| this->mode_ == DYNAMIC_LIST)
return c + 1;
return NULL;
// TODO(csilvers): why allow this? ^ is meaningless in version scripts.
case '^':
if (this->mode_ == VERSION_SCRIPT || this->mode_ == DYNAMIC_LIST)
return c + 1;
return NULL;
case ':':
if (this->mode_ == LINKER_SCRIPT)
return c + 1;
else if ((this->mode_ == VERSION_SCRIPT || this->mode_ == DYNAMIC_LIST)
&& (c[1] == ':'))
{
// A name can have '::' in it, as that's a c++ namespace
// separator. But a single colon is not part of a name.
return c + 2;
}
return NULL;
default:
return NULL;
}
}
// For a number we accept 0x followed by hex digits, or any sequence
// of digits. The old linker accepts leading '$' for hex, and
// trailing HXBOD. Those are for MRI compatibility and we don't
// accept them.
// Return whether C1 C2 C3 can start a hex number.
inline bool
Lex::can_start_hex(char c1, char c2, char c3)
{
if (c1 == '0' && (c2 == 'x' || c2 == 'X'))
return this->can_continue_hex(&c3);
return false;
}
// Return whether C can appear in a hex number.
inline const char*
Lex::can_continue_hex(const char* c)
{
switch (*c)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
return c + 1;
default:
return NULL;
}
}
// Return whether C can start a non-hex number.
inline bool
Lex::can_start_number(char c)
{
switch (c)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return true;
default:
return false;
}
}
// If C1 C2 C3 form a valid three character operator, return the
// opcode (defined in the yyscript.h file generated from yyscript.y).
// Otherwise return 0.
inline int
Lex::three_char_operator(char c1, char c2, char c3)
{
switch (c1)
{
case '<':
if (c2 == '<' && c3 == '=')
return LSHIFTEQ;
break;
case '>':
if (c2 == '>' && c3 == '=')
return RSHIFTEQ;
break;
default:
break;
}
return 0;
}
// If C1 C2 form a valid two character operator, return the opcode
// (defined in the yyscript.h file generated from yyscript.y).
// Otherwise return 0.
inline int
Lex::two_char_operator(char c1, char c2)
{
switch (c1)
{
case '=':
if (c2 == '=')
return EQ;
break;
case '!':
if (c2 == '=')
return NE;
break;
case '+':
if (c2 == '=')
return PLUSEQ;
break;
case '-':
if (c2 == '=')
return MINUSEQ;
break;
case '*':
if (c2 == '=')
return MULTEQ;
break;
case '/':
if (c2 == '=')
return DIVEQ;
break;
case '|':
if (c2 == '=')
return OREQ;
if (c2 == '|')
return OROR;
break;
case '&':
if (c2 == '=')
return ANDEQ;
if (c2 == '&')
return ANDAND;
break;
case '>':
if (c2 == '=')
return GE;
if (c2 == '>')
return RSHIFT;
break;
case '<':
if (c2 == '=')
return LE;
if (c2 == '<')
return LSHIFT;
break;
default:
break;
}
return 0;
}
// If C1 is a valid operator, return the opcode. Otherwise return 0.
inline int
Lex::one_char_operator(char c1)
{
switch (c1)
{
case '+':
case '-':
case '*':
case '/':
case '%':
case '!':
case '&':
case '|':
case '^':
case '~':
case '<':
case '>':
case '=':
case '?':
case ',':
case '(':
case ')':
case '{':
case '}':
case '[':
case ']':
case ':':
case ';':
return c1;
default:
return 0;
}
}
// Skip a C style comment. *PP points to just after the "/*". Return
// false if the comment did not end.
bool
Lex::skip_c_comment(const char** pp)
{
const char* p = *pp;
while (p[0] != '*' || p[1] != '/')
{
if (*p == '\0')
{
*pp = p;
return false;
}
if (*p == '\n')
{
++this->lineno_;
this->linestart_ = p + 1;
}
++p;
}
*pp = p + 2;
return true;
}
// Skip a line # comment. Return false if there was no newline.
bool
Lex::skip_line_comment(const char** pp)
{
const char* p = *pp;
size_t skip = strcspn(p, "\n");
if (p[skip] == '\0')
{
*pp = p + skip;
return false;
}
p += skip + 1;
++this->lineno_;
this->linestart_ = p;
*pp = p;
return true;
}
// Build a token CLASSIFICATION from all characters that match
// CAN_CONTINUE_FN. Update *PP.
inline Token
Lex::gather_token(Token::Classification classification,
const char* (Lex::*can_continue_fn)(const char*),
const char* start,
const char* match,
const char** pp)
{
const char* new_match = NULL;
while ((new_match = (this->*can_continue_fn)(match)) != NULL)
match = new_match;
// A special case: integers may be followed by a single M or K,
// case-insensitive.
if (classification == Token::TOKEN_INTEGER
&& (*match == 'm' || *match == 'M' || *match == 'k' || *match == 'K'))
++match;
*pp = match;
return this->make_token(classification, start, match - start, start);
}
// Build a token from a quoted string.
Token
Lex::gather_quoted_string(const char** pp)
{
const char* start = *pp;
const char* p = start;
++p;
size_t skip = strcspn(p, "\"\n");
if (p[skip] != '"')
return this->make_invalid_token(start);
*pp = p + skip + 1;
return this->make_token(Token::TOKEN_QUOTED_STRING, p, skip, start);
}
// Return the next token at *PP. Update *PP. General guideline: we
// require linker scripts to be simple ASCII. No unicode linker
// scripts. In particular we can assume that any '\0' is the end of
// the input.
Token
Lex::get_token(const char** pp)
{
const char* p = *pp;
while (true)
{
// Skip whitespace quickly.
while (*p == ' ' || *p == '\t' || *p == '\r')
++p;
if (*p == '\n')
{
++p;
++this->lineno_;
this->linestart_ = p;
continue;
}
char c0 = *p;
if (c0 == '\0')
{
*pp = p;
return this->make_eof_token(p);
}
char c1 = p[1];
// Skip C style comments.
if (c0 == '/' && c1 == '*')
{
int lineno = this->lineno_;
int charpos = p - this->linestart_ + 1;
*pp = p + 2;
if (!this->skip_c_comment(pp))
return Token(Token::TOKEN_INVALID, lineno, charpos);
p = *pp;
continue;
}
// Skip line comments.
if (c0 == '#')
{
*pp = p + 1;
if (!this->skip_line_comment(pp))
return this->make_eof_token(p);
p = *pp;
continue;
}
// Check for a name.
if (this->can_start_name(c0, c1))
return this->gather_token(Token::TOKEN_STRING,
&Lex::can_continue_name,
p, p + 1, pp);
// We accept any arbitrary name in double quotes, as long as it
// does not cross a line boundary.
if (*p == '"')
{
*pp = p;
return this->gather_quoted_string(pp);
}
// Be careful not to lookahead past the end of the buffer.
char c2 = (c1 == '\0' ? '\0' : p[2]);
// Check for a number.
if (this->can_start_hex(c0, c1, c2))
return this->gather_token(Token::TOKEN_INTEGER,
&Lex::can_continue_hex,
p, p + 3, pp);
if (Lex::can_start_number(c0))
return this->gather_token(Token::TOKEN_INTEGER,
&Lex::can_continue_number,
p, p + 1, pp);
// Check for operators.
int opcode = Lex::three_char_operator(c0, c1, c2);
if (opcode != 0)
{
*pp = p + 3;
return this->make_token(opcode, p);
}
opcode = Lex::two_char_operator(c0, c1);
if (opcode != 0)
{
*pp = p + 2;
return this->make_token(opcode, p);
}
opcode = Lex::one_char_operator(c0);
if (opcode != 0)
{
*pp = p + 1;
return this->make_token(opcode, p);
}
return this->make_token(Token::TOKEN_INVALID, p);
}
}
// Return the next token.
const Token*
Lex::next_token()
{
// The first token is special.
if (this->first_token_ != 0)
{
this->token_ = Token(this->first_token_, 0, 0);
this->first_token_ = 0;
return &this->token_;
}
this->token_ = this->get_token(&this->current_);
// Don't let an early null byte fool us into thinking that we've
// reached the end of the file.
if (this->token_.is_eof()
&& (static_cast<size_t>(this->current_ - this->input_string_)
< this->input_length_))
this->token_ = this->make_invalid_token(this->current_);
return &this->token_;
}
// class Symbol_assignment.
// Add the symbol to the symbol table. This makes sure the symbol is
// there and defined. The actual value is stored later. We can't
// determine the actual value at this point, because we can't
// necessarily evaluate the expression until all ordinary symbols have
// been finalized.
// The GNU linker lets symbol assignments in the linker script
// silently override defined symbols in object files. We are
// compatible. FIXME: Should we issue a warning?
void
Symbol_assignment::add_to_table(Symbol_table* symtab)
{
elfcpp::STV vis = this->hidden_ ? elfcpp::STV_HIDDEN : elfcpp::STV_DEFAULT;
this->sym_ = symtab->define_as_constant(this->name_.c_str(),
NULL, // version
(this->is_defsym_
? Symbol_table::DEFSYM
: Symbol_table::SCRIPT),
0, // value
0, // size
elfcpp::STT_NOTYPE,
elfcpp::STB_GLOBAL,
vis,
0, // nonvis
this->provide_,
true); // force_override
}
// Finalize a symbol value.
void
Symbol_assignment::finalize(Symbol_table* symtab, const Layout* layout)
{
this->finalize_maybe_dot(symtab, layout, false, 0, NULL);
}
// Finalize a symbol value which can refer to the dot symbol.
void
Symbol_assignment::finalize_with_dot(Symbol_table* symtab,
const Layout* layout,
uint64_t dot_value,
Output_section* dot_section)
{
this->finalize_maybe_dot(symtab, layout, true, dot_value, dot_section);
}
// Finalize a symbol value, internal version.
void
Symbol_assignment::finalize_maybe_dot(Symbol_table* symtab,
const Layout* layout,
bool is_dot_available,
uint64_t dot_value,
Output_section* dot_section)
{
// If we were only supposed to provide this symbol, the sym_ field
// will be NULL if the symbol was not referenced.
if (this->sym_ == NULL)
{
gold_assert(this->provide_);
return;
}
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
this->sized_finalize<32>(symtab, layout, is_dot_available, dot_value,
dot_section);
#else
gold_unreachable();
#endif
}
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
this->sized_finalize<64>(symtab, layout, is_dot_available, dot_value,
dot_section);
#else
gold_unreachable();
#endif
}
else
gold_unreachable();
}
template<int size>
void
Symbol_assignment::sized_finalize(Symbol_table* symtab, const Layout* layout,
bool is_dot_available, uint64_t dot_value,
Output_section* dot_section)
{
Output_section* section;
elfcpp::STT type = elfcpp::STT_NOTYPE;
elfcpp::STV vis = elfcpp::STV_DEFAULT;
unsigned char nonvis = 0;
uint64_t final_val = this->val_->eval_maybe_dot(symtab, layout, true,
is_dot_available,
dot_value, dot_section,
§ion, NULL, &type,
&vis, &nonvis, false, NULL);
Sized_symbol<size>* ssym = symtab->get_sized_symbol<size>(this->sym_);
ssym->set_value(final_val);
ssym->set_type(type);
ssym->set_visibility(vis);
ssym->set_nonvis(nonvis);
if (section != NULL)
ssym->set_output_section(section);
}
// Set the symbol value if the expression yields an absolute value or
// a value relative to DOT_SECTION.
void
Symbol_assignment::set_if_absolute(Symbol_table* symtab, const Layout* layout,
bool is_dot_available, uint64_t dot_value,
Output_section* dot_section)
{
if (this->sym_ == NULL)
return;
Output_section* val_section;
bool is_valid;
uint64_t val = this->val_->eval_maybe_dot(symtab, layout, false,
is_dot_available, dot_value,
dot_section, &val_section, NULL,
NULL, NULL, NULL, false, &is_valid);
if (!is_valid || (val_section != NULL && val_section != dot_section))
return;
if (parameters->target().get_size() == 32)
{
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
Sized_symbol<32>* ssym = symtab->get_sized_symbol<32>(this->sym_);
ssym->set_value(val);
#else
gold_unreachable();
#endif
}
else if (parameters->target().get_size() == 64)
{
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(this->sym_);
ssym->set_value(val);
#else
gold_unreachable();
#endif
}
else
gold_unreachable();
if (val_section != NULL)
this->sym_->set_output_section(val_section);
}
// Print for debugging.
void
Symbol_assignment::print(FILE* f) const
{
if (this->provide_ && this->hidden_)
fprintf(f, "PROVIDE_HIDDEN(");
else if (this->provide_)
fprintf(f, "PROVIDE(");
else if (this->hidden_)
gold_unreachable();
fprintf(f, "%s = ", this->name_.c_str());
this->val_->print(f);
if (this->provide_ || this->hidden_)
fprintf(f, ")");
fprintf(f, "\n");
}
// Class Script_assertion.
// Check the assertion.
void
Script_assertion::check(const Symbol_table* symtab, const Layout* layout)
{
if (!this->check_->eval(symtab, layout, true))
gold_error("%s", this->message_.c_str());
}
// Print for debugging.
void
Script_assertion::print(FILE* f) const
{
fprintf(f, "ASSERT(");
this->check_->print(f);
fprintf(f, ", \"%s\")\n", this->message_.c_str());
}
// Class Script_options.
Script_options::Script_options()
: entry_(), symbol_assignments_(), symbol_definitions_(),
symbol_references_(), version_script_info_(), script_sections_()
{
}
// Returns true if NAME is on the list of symbol assignments waiting
// to be processed.
bool
Script_options::is_pending_assignment(const char* name)
{
for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
if ((*p)->name() == name)
return true;
return false;
}
// Populates the set with symbols defined in defsym LHS.
void Script_options::find_defsym_defs(Unordered_set<std::string>& defsym_set)
{
for (Symbol_assignments::const_iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
{
defsym_set.insert((*p)->name());
}
}
void
Script_options::set_defsym_uses_in_real_elf(Symbol_table* symtab) const
{
for (Symbol_assignments::const_iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
{
(*p)->value()->set_expr_sym_in_real_elf(symtab);
}
}
// Add a symbol to be defined.
void
Script_options::add_symbol_assignment(const char* name, size_t length,
bool is_defsym, Expression* value,
bool provide, bool hidden)
{
if (length != 1 || name[0] != '.')
{
if (this->script_sections_.in_sections_clause())
{
gold_assert(!is_defsym);
this->script_sections_.add_symbol_assignment(name, length, value,
provide, hidden);
}
else
{
Symbol_assignment* p = new Symbol_assignment(name, length, is_defsym,
value, provide, hidden);
this->symbol_assignments_.push_back(p);
}
if (!provide)
{
std::string n(name, length);
this->symbol_definitions_.insert(n);
this->symbol_references_.erase(n);
}
}
else
{
if (provide || hidden)
gold_error(_("invalid use of PROVIDE for dot symbol"));
// The GNU linker permits assignments to dot outside of SECTIONS
// clauses and treats them as occurring inside, so we don't
// check in_sections_clause here.
this->script_sections_.add_dot_assignment(value);
}
}
// Add a reference to a symbol.
void
Script_options::add_symbol_reference(const char* name, size_t length)
{
if (length != 1 || name[0] != '.')
{
std::string n(name, length);
if (this->symbol_definitions_.find(n) == this->symbol_definitions_.end())
this->symbol_references_.insert(n);
}
}
// Add an assertion.
void
Script_options::add_assertion(Expression* check, const char* message,
size_t messagelen)
{
if (this->script_sections_.in_sections_clause())
this->script_sections_.add_assertion(check, message, messagelen);
else
{
Script_assertion* p = new Script_assertion(check, message, messagelen);
this->assertions_.push_back(p);
}
}
// Create sections required by any linker scripts.
void
Script_options::create_script_sections(Layout* layout)
{
if (this->saw_sections_clause())
this->script_sections_.create_sections(layout);
}
// Add any symbols we are defining to the symbol table.
void
Script_options::add_symbols_to_table(Symbol_table* symtab)
{
for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
(*p)->add_to_table(symtab);
this->script_sections_.add_symbols_to_table(symtab);
}
// Finalize symbol values. Also check assertions.
void
Script_options::finalize_symbols(Symbol_table* symtab, const Layout* layout)
{
// We finalize the symbols defined in SECTIONS first, because they
// are the ones which may have changed. This way if symbol outside
// SECTIONS are defined in terms of symbols inside SECTIONS, they
// will get the right value.
this->script_sections_.finalize_symbols(symtab, layout);
for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
(*p)->finalize(symtab, layout);
for (Assertions::iterator p = this->assertions_.begin();
p != this->assertions_.end();
++p)
(*p)->check(symtab, layout);
}
// Set section addresses. We set all the symbols which have absolute
// values. Then we let the SECTIONS clause do its thing. This
// returns the segment which holds the file header and segment
// headers, if any.
Output_segment*
Script_options::set_section_addresses(Symbol_table* symtab, Layout* layout)
{
for (Symbol_assignments::iterator p = this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
(*p)->set_if_absolute(symtab, layout, false, 0, NULL);
return this->script_sections_.set_section_addresses(symtab, layout);
}
// This class holds data passed through the parser to the lexer and to
// the parser support functions. This avoids global variables. We
// can't use global variables because we need not be called by a
// singleton thread.
class Parser_closure
{
public:
Parser_closure(const char* filename,
const Position_dependent_options& posdep_options,
bool parsing_defsym, bool in_group, bool is_in_sysroot,
Command_line* command_line,
Script_options* script_options,
Lex* lex,
bool skip_on_incompatible_target,
Script_info* script_info)
: filename_(filename), posdep_options_(posdep_options),
parsing_defsym_(parsing_defsym), in_group_(in_group),
is_in_sysroot_(is_in_sysroot),
skip_on_incompatible_target_(skip_on_incompatible_target),
found_incompatible_target_(false),
command_line_(command_line), script_options_(script_options),
version_script_info_(script_options->version_script_info()),
lex_(lex), lineno_(0), charpos_(0), lex_mode_stack_(), inputs_(NULL),
script_info_(script_info)
{
// We start out processing C symbols in the default lex mode.
this->language_stack_.push_back(Version_script_info::LANGUAGE_C);
this->lex_mode_stack_.push_back(lex->mode());
}
// Return the file name.
const char*
filename() const
{ return this->filename_; }
// Return the position dependent options. The caller may modify
// this.
Position_dependent_options&
position_dependent_options()
{ return this->posdep_options_; }
// Whether we are parsing a --defsym.
bool
parsing_defsym() const
{ return this->parsing_defsym_; }
// Return whether this script is being run in a group.
bool
in_group() const
{ return this->in_group_; }
// Return whether this script was found using a directory in the
// sysroot.
bool
is_in_sysroot() const
{ return this->is_in_sysroot_; }
// Whether to skip to the next file with the same name if we find an
// incompatible target in an OUTPUT_FORMAT statement.
bool
skip_on_incompatible_target() const
{ return this->skip_on_incompatible_target_; }
// Stop skipping to the next file on an incompatible target. This
// is called when we make some unrevocable change to the data
// structures.
void
clear_skip_on_incompatible_target()
{ this->skip_on_incompatible_target_ = false; }
// Whether we found an incompatible target in an OUTPUT_FORMAT
// statement.
bool
found_incompatible_target() const
{ return this->found_incompatible_target_; }
// Note that we found an incompatible target.
void
set_found_incompatible_target()
{ this->found_incompatible_target_ = true; }
// Returns the Command_line structure passed in at constructor time.
// This value may be NULL. The caller may modify this, which modifies
// the passed-in Command_line object (not a copy).
Command_line*
command_line()
{ return this->command_line_; }
// Return the options which may be set by a script.
Script_options*
script_options()
{ return this->script_options_; }
// Return the object in which version script information should be stored.
Version_script_info*
version_script()
{ return this->version_script_info_; }
// Return the next token, and advance.
const Token*
next_token()
{
const Token* token = this->lex_->next_token();
this->lineno_ = token->lineno();
this->charpos_ = token->charpos();
return token;
}
// Set a new lexer mode, pushing the current one.
void
push_lex_mode(Lex::Mode mode)
{
this->lex_mode_stack_.push_back(this->lex_->mode());
this->lex_->set_mode(mode);
}
// Pop the lexer mode.
void
pop_lex_mode()
{
gold_assert(!this->lex_mode_stack_.empty());
this->lex_->set_mode(this->lex_mode_stack_.back());
this->lex_mode_stack_.pop_back();
}
// Return the current lexer mode.
Lex::Mode
lex_mode() const
{ return this->lex_mode_stack_.back(); }
// Return the line number of the last token.
int
lineno() const
{ return this->lineno_; }
// Return the character position in the line of the last token.
int
charpos() const
{ return this->charpos_; }
// Return the list of input files, creating it if necessary. This
// is a space leak--we never free the INPUTS_ pointer.
Input_arguments*
inputs()
{
if (this->inputs_ == NULL)
this->inputs_ = new Input_arguments();
return this->inputs_;
}
// Return whether we saw any input files.
bool
saw_inputs() const
{ return this->inputs_ != NULL && !this->inputs_->empty(); }
// Return the current language being processed in a version script
// (eg, "C++"). The empty string represents unmangled C names.
Version_script_info::Language
get_current_language() const
{ return this->language_stack_.back(); }
// Push a language onto the stack when entering an extern block.
void
push_language(Version_script_info::Language lang)
{ this->language_stack_.push_back(lang); }
// Pop a language off of the stack when exiting an extern block.
void
pop_language()
{
gold_assert(!this->language_stack_.empty());
this->language_stack_.pop_back();
}
// Return a pointer to the incremental info.
Script_info*
script_info()
{ return this->script_info_; }
private:
// The name of the file we are reading.
const char* filename_;
// The position dependent options.
Position_dependent_options posdep_options_;
// True if we are parsing a --defsym.
bool parsing_defsym_;
// Whether we are currently in a --start-group/--end-group.
bool in_group_;
// Whether the script was found in a sysrooted directory.
bool is_in_sysroot_;
// If this is true, then if we find an OUTPUT_FORMAT with an
// incompatible target, then we tell the parser to abort so that we
// can search for the next file with the same name.
bool skip_on_incompatible_target_;
// True if we found an OUTPUT_FORMAT with an incompatible target.
bool found_incompatible_target_;
// May be NULL if the user chooses not to pass one in.
Command_line* command_line_;
// Options which may be set from any linker script.
Script_options* script_options_;
// Information parsed from a version script.
Version_script_info* version_script_info_;
// The lexer.
Lex* lex_;
// The line number of the last token returned by next_token.
int lineno_;
// The column number of the last token returned by next_token.
int charpos_;
// A stack of lexer modes.
std::vector<Lex::Mode> lex_mode_stack_;
// A stack of which extern/language block we're inside. Can be C++,
// java, or empty for C.
std::vector<Version_script_info::Language> language_stack_;
// New input files found to add to the link.
Input_arguments* inputs_;
// Pointer to incremental linking info.
Script_info* script_info_;
};
// FILE was found as an argument on the command line. Try to read it
// as a script. Return true if the file was handled.
bool
read_input_script(Workqueue* workqueue, Symbol_table* symtab, Layout* layout,
Dirsearch* dirsearch, int dirindex,
Input_objects* input_objects, Mapfile* mapfile,
Input_group* input_group,
const Input_argument* input_argument,
Input_file* input_file, Task_token* next_blocker,
bool* used_next_blocker)
{
*used_next_blocker = false;
std::string input_string;
Lex::read_file(input_file, &input_string);
Lex lex(input_string.c_str(), input_string.length(), PARSING_LINKER_SCRIPT);
Script_info* script_info = NULL;
if (layout->incremental_inputs() != NULL)
{
const std::string& filename = input_file->filename();
Timespec mtime = input_file->file().get_mtime();
unsigned int arg_serial = input_argument->file().arg_serial();
script_info = new Script_info(filename);
layout->incremental_inputs()->report_script(script_info, arg_serial,
mtime);
}
Parser_closure closure(input_file->filename().c_str(),
input_argument->file().options(),
false,
input_group != NULL,
input_file->is_in_sysroot(),
NULL,
layout->script_options(),
&lex,
input_file->will_search_for(),
script_info);
bool old_saw_sections_clause =
layout->script_options()->saw_sections_clause();
if (yyparse(&closure) != 0)
{
if (closure.found_incompatible_target())
{
Read_symbols::incompatible_warning(input_argument, input_file);
Read_symbols::requeue(workqueue, input_objects, symtab, layout,
dirsearch, dirindex, mapfile, input_argument,
input_group, next_blocker);
return true;
}
return false;
}
if (!old_saw_sections_clause
&& layout->script_options()->saw_sections_clause()
&& layout->have_added_input_section())
gold_error(_("%s: SECTIONS seen after other input files; try -T/--script"),
input_file->filename().c_str());
if (!closure.saw_inputs())
return true;
Task_token* this_blocker = NULL;
for (Input_arguments::const_iterator p = closure.inputs()->begin();
p != closure.inputs()->end();
++p)
{
Task_token* nb;
if (p + 1 == closure.inputs()->end())
nb = next_blocker;
else
{
nb = new Task_token(true);
nb->add_blocker();
}
workqueue->queue_soon(new Read_symbols(input_objects, symtab,
layout, dirsearch, 0, mapfile, &*p,
input_group, NULL, this_blocker, nb));
this_blocker = nb;
}
*used_next_blocker = true;
return true;
}
// Helper function for read_version_script(), read_commandline_script() and
// script_include_directive(). Processes the given file in the mode indicated
// by first_token and lex_mode.
static bool
read_script_file(const char* filename, Command_line* cmdline,
Script_options* script_options,
int first_token, Lex::Mode lex_mode)
{
Dirsearch dirsearch;
std::string name = filename;
// If filename is a relative filename, search for it manually using "." +
// cmdline->options()->library_path() -- not dirsearch.
if (!IS_ABSOLUTE_PATH(filename))
{
const General_options::Dir_list& search_path =
cmdline->options().library_path();
name = Dirsearch::find_file_in_dir_list(name, search_path, ".");
}
// The file locking code wants to record a Task, but we haven't
// started the workqueue yet. This is only for debugging purposes,
// so we invent a fake value.
const Task* task = reinterpret_cast<const Task*>(-1);
// We don't want this file to be opened in binary mode.
Position_dependent_options posdep = cmdline->position_dependent_options();
if (posdep.format_enum() == General_options::OBJECT_FORMAT_BINARY)
posdep.set_format_enum(General_options::OBJECT_FORMAT_ELF);
Input_file_argument input_argument(name.c_str(),
Input_file_argument::INPUT_FILE_TYPE_FILE,
"", false, posdep);
Input_file input_file(&input_argument);
int dummy = 0;
if (!input_file.open(dirsearch, task, &dummy))
return false;
std::string input_string;
Lex::read_file(&input_file, &input_string);
Lex lex(input_string.c_str(), input_string.length(), first_token);
lex.set_mode(lex_mode);
Parser_closure closure(filename,
cmdline->position_dependent_options(),
first_token == Lex::DYNAMIC_LIST,
false,
input_file.is_in_sysroot(),
cmdline,
script_options,
&lex,
false,
NULL);
if (yyparse(&closure) != 0)
{
input_file.file().unlock(task);
return false;
}
input_file.file().unlock(task);
gold_assert(!closure.saw_inputs());
return true;
}
// FILENAME was found as an argument to --script (-T).
// Read it as a script, and execute its contents immediately.
bool
read_commandline_script(const char* filename, Command_line* cmdline)
{
return read_script_file(filename, cmdline, &cmdline->script_options(),
PARSING_LINKER_SCRIPT, Lex::LINKER_SCRIPT);
}
// FILENAME was found as an argument to --version-script. Read it as
// a version script, and store its contents in
// cmdline->script_options()->version_script_info().
bool
read_version_script(const char* filename, Command_line* cmdline)
{
return read_script_file(filename, cmdline, &cmdline->script_options(),
PARSING_VERSION_SCRIPT, Lex::VERSION_SCRIPT);
}
// FILENAME was found as an argument to --dynamic-list. Read it as a
// list of symbols, and store its contents in DYNAMIC_LIST.
bool
read_dynamic_list(const char* filename, Command_line* cmdline,
Script_options* dynamic_list)
{
return read_script_file(filename, cmdline, dynamic_list,
PARSING_DYNAMIC_LIST, Lex::DYNAMIC_LIST);
}
// Implement the --defsym option on the command line. Return true if
// all is well.
bool
Script_options::define_symbol(const char* definition)
{
Lex lex(definition, strlen(definition), PARSING_DEFSYM);
lex.set_mode(Lex::EXPRESSION);
// Dummy value.
Position_dependent_options posdep_options;
Parser_closure closure("command line", posdep_options, true,
false, false, NULL, this, &lex, false, NULL);
if (yyparse(&closure) != 0)
return false;
gold_assert(!closure.saw_inputs());
return true;
}
// Print the script to F for debugging.
void
Script_options::print(FILE* f) const
{
fprintf(f, "%s: Dumping linker script\n", program_name);
if (!this->entry_.empty())
fprintf(f, "ENTRY(%s)\n", this->entry_.c_str());
for (Symbol_assignments::const_iterator p =
this->symbol_assignments_.begin();
p != this->symbol_assignments_.end();
++p)
(*p)->print(f);
for (Assertions::const_iterator p = this->assertions_.begin();
p != this->assertions_.end();
++p)
(*p)->print(f);
this->script_sections_.print(f);
this->version_script_info_.print(f);
}
// Manage mapping from keywords to the codes expected by the bison
// parser. We construct one global object for each lex mode with
// keywords.
class Keyword_to_parsecode
{
public:
// The structure which maps keywords to parsecodes.
struct Keyword_parsecode
{
// Keyword.
const char* keyword;
// Corresponding parsecode.
int parsecode;
};
Keyword_to_parsecode(const Keyword_parsecode* keywords,
int keyword_count)
: keyword_parsecodes_(keywords), keyword_count_(keyword_count)
{ }
// Return the parsecode corresponding KEYWORD, or 0 if it is not a
// keyword.
int
keyword_to_parsecode(const char* keyword, size_t len) const;
private:
const Keyword_parsecode* keyword_parsecodes_;
const int keyword_count_;
};
// Mapping from keyword string to keyword parsecode. This array must
// be kept in sorted order. Parsecodes are looked up using bsearch.
// This array must correspond to the list of parsecodes in yyscript.y.
static const Keyword_to_parsecode::Keyword_parsecode
script_keyword_parsecodes[] =
{
{ "ABSOLUTE", ABSOLUTE },
{ "ADDR", ADDR },
{ "ALIGN", ALIGN_K },
{ "ALIGNOF", ALIGNOF },
{ "ASSERT", ASSERT_K },
{ "AS_NEEDED", AS_NEEDED },
{ "AT", AT },
{ "BIND", BIND },
{ "BLOCK", BLOCK },
{ "BYTE", BYTE },
{ "CONSTANT", CONSTANT },
{ "CONSTRUCTORS", CONSTRUCTORS },
{ "COPY", COPY },
{ "CREATE_OBJECT_SYMBOLS", CREATE_OBJECT_SYMBOLS },
{ "DATA_SEGMENT_ALIGN", DATA_SEGMENT_ALIGN },
{ "DATA_SEGMENT_END", DATA_SEGMENT_END },
{ "DATA_SEGMENT_RELRO_END", DATA_SEGMENT_RELRO_END },
{ "DEFINED", DEFINED },
{ "DSECT", DSECT },
{ "ENTRY", ENTRY },
{ "EXCLUDE_FILE", EXCLUDE_FILE },
{ "EXTERN", EXTERN },
{ "FILL", FILL },
{ "FLOAT", FLOAT },
{ "FORCE_COMMON_ALLOCATION", FORCE_COMMON_ALLOCATION },
{ "GROUP", GROUP },
{ "HIDDEN", HIDDEN },
{ "HLL", HLL },
{ "INCLUDE", INCLUDE },
{ "INFO", INFO },
{ "INHIBIT_COMMON_ALLOCATION", INHIBIT_COMMON_ALLOCATION },
{ "INPUT", INPUT },
{ "KEEP", KEEP },
{ "LENGTH", LENGTH },
{ "LOADADDR", LOADADDR },
{ "LONG", LONG },
{ "MAP", MAP },
{ "MAX", MAX_K },
{ "MEMORY", MEMORY },
{ "MIN", MIN_K },
{ "NEXT", NEXT },
{ "NOCROSSREFS", NOCROSSREFS },
{ "NOFLOAT", NOFLOAT },
{ "NOLOAD", NOLOAD },
{ "ONLY_IF_RO", ONLY_IF_RO },
{ "ONLY_IF_RW", ONLY_IF_RW },
{ "OPTION", OPTION },
{ "ORIGIN", ORIGIN },
{ "OUTPUT", OUTPUT },
{ "OUTPUT_ARCH", OUTPUT_ARCH },
{ "OUTPUT_FORMAT", OUTPUT_FORMAT },
{ "OVERLAY", OVERLAY },
{ "PHDRS", PHDRS },
{ "PROVIDE", PROVIDE },
{ "PROVIDE_HIDDEN", PROVIDE_HIDDEN },
{ "QUAD", QUAD },
{ "SEARCH_DIR", SEARCH_DIR },
{ "SECTIONS", SECTIONS },
{ "SEGMENT_START", SEGMENT_START },
{ "SHORT", SHORT },
{ "SIZEOF", SIZEOF },
{ "SIZEOF_HEADERS", SIZEOF_HEADERS },
{ "SORT", SORT_BY_NAME },
{ "SORT_BY_ALIGNMENT", SORT_BY_ALIGNMENT },
{ "SORT_BY_INIT_PRIORITY", SORT_BY_INIT_PRIORITY },
{ "SORT_BY_NAME", SORT_BY_NAME },
{ "SPECIAL", SPECIAL },
{ "SQUAD", SQUAD },
{ "STARTUP", STARTUP },
{ "SUBALIGN", SUBALIGN },
{ "SYSLIB", SYSLIB },
{ "TARGET", TARGET_K },
{ "TRUNCATE", TRUNCATE },
{ "VERSION", VERSIONK },
{ "global", GLOBAL },
{ "l", LENGTH },
{ "len", LENGTH },
{ "local", LOCAL },
{ "o", ORIGIN },
{ "org", ORIGIN },
{ "sizeof_headers", SIZEOF_HEADERS },
};
static const Keyword_to_parsecode
script_keywords(&script_keyword_parsecodes[0],
(sizeof(script_keyword_parsecodes)
/ sizeof(script_keyword_parsecodes[0])));
static const Keyword_to_parsecode::Keyword_parsecode
version_script_keyword_parsecodes[] =
{
{ "extern", EXTERN },
{ "global", GLOBAL },
{ "local", LOCAL },
};
static const Keyword_to_parsecode
version_script_keywords(&version_script_keyword_parsecodes[0],
(sizeof(version_script_keyword_parsecodes)
/ sizeof(version_script_keyword_parsecodes[0])));
static const Keyword_to_parsecode::Keyword_parsecode
dynamic_list_keyword_parsecodes[] =
{
{ "extern", EXTERN },
};
static const Keyword_to_parsecode
dynamic_list_keywords(&dynamic_list_keyword_parsecodes[0],
(sizeof(dynamic_list_keyword_parsecodes)
/ sizeof(dynamic_list_keyword_parsecodes[0])));
// Comparison function passed to bsearch.
extern "C"
{
struct Ktt_key
{
const char* str;
size_t len;
};
static int
ktt_compare(const void* keyv, const void* kttv)
{
const Ktt_key* key = static_cast<const Ktt_key*>(keyv);
const Keyword_to_parsecode::Keyword_parsecode* ktt =
static_cast<const Keyword_to_parsecode::Keyword_parsecode*>(kttv);
int i = strncmp(key->str, ktt->keyword, key->len);
if (i != 0)
return i;
if (ktt->keyword[key->len] != '\0')
return -1;
return 0;
}
} // End extern "C".
int
Keyword_to_parsecode::keyword_to_parsecode(const char* keyword,
size_t len) const
{
Ktt_key key;
key.str = keyword;
key.len = len;
void* kttv = bsearch(&key,
this->keyword_parsecodes_,
this->keyword_count_,
sizeof(this->keyword_parsecodes_[0]),
ktt_compare);
if (kttv == NULL)
return 0;
Keyword_parsecode* ktt = static_cast<Keyword_parsecode*>(kttv);
return ktt->parsecode;
}
// The following structs are used within the VersionInfo class as well
// as in the bison helper functions. They store the information
// parsed from the version script.
// A single version expression.
// For example, pattern="std::map*" and language="C++".
struct Version_expression
{
Version_expression(const std::string& a_pattern,
Version_script_info::Language a_language,
bool a_exact_match)
: pattern(a_pattern), language(a_language), exact_match(a_exact_match),
was_matched_by_symbol(false)
{ }
std::string pattern;
Version_script_info::Language language;
// If false, we use glob() to match pattern. If true, we use strcmp().
bool exact_match;
// True if --no-undefined-version is in effect and we found this
// version in get_symbol_version. We use mutable because this
// struct is generally not modifiable after it has been created.
mutable bool was_matched_by_symbol;
};
// A list of expressions.
struct Version_expression_list
{
std::vector<struct Version_expression> expressions;
};
// A list of which versions upon which another version depends.
// Strings should be from the Stringpool.
struct Version_dependency_list
{
std::vector<std::string> dependencies;
};
// The total definition of a version. It includes the tag for the
// version, its global and local expressions, and any dependencies.
struct Version_tree
{
Version_tree()
: tag(), global(NULL), local(NULL), dependencies(NULL)
{ }
std::string tag;
const struct Version_expression_list* global;
const struct Version_expression_list* local;
const struct Version_dependency_list* dependencies;
};
// Helper class that calls cplus_demangle when needed and takes care of freeing
// the result.
class Lazy_demangler
{
public:
Lazy_demangler(const char* symbol, int options)
: symbol_(symbol), options_(options), demangled_(NULL), did_demangle_(false)
{ }
~Lazy_demangler()
{ free(this->demangled_); }
// Return the demangled name. The actual demangling happens on the first call,
// and the result is later cached.
inline char*
get();
private:
// The symbol to demangle.
const char* symbol_;
// Option flags to pass to cplus_demagle.
const int options_;
// The cached demangled value, or NULL if demangling didn't happen yet or
// failed.
char* demangled_;
// Whether we already called cplus_demangle
bool did_demangle_;
};
// Return the demangled name. The actual demangling happens on the first call,
// and the result is later cached. Returns NULL if the symbol cannot be
// demangled.
inline char*
Lazy_demangler::get()
{
if (!this->did_demangle_)
{
this->demangled_ = cplus_demangle(this->symbol_, this->options_);
this->did_demangle_ = true;
}
return this->demangled_;
}
// Class Version_script_info.
Version_script_info::Version_script_info()
: dependency_lists_(), expression_lists_(), version_trees_(), globs_(),
default_version_(NULL), default_is_global_(false), is_finalized_(false)
{
for (int i = 0; i < LANGUAGE_COUNT; ++i)
this->exact_[i] = NULL;
}
Version_script_info::~Version_script_info()
{
}
// Forget all the known version script information.
void
Version_script_info::clear()
{
for (size_t k = 0; k < this->dependency_lists_.size(); ++k)
delete this->dependency_lists_[k];
this->dependency_lists_.clear();
for (size_t k = 0; k < this->version_trees_.size(); ++k)
delete this->version_trees_[k];
this->version_trees_.clear();
for (size_t k = 0; k < this->expression_lists_.size(); ++k)
delete this->expression_lists_[k];
this->expression_lists_.clear();
}
// Finalize the version script information.
void
Version_script_info::finalize()
{
if (!this->is_finalized_)
{
this->build_lookup_tables();
this->is_finalized_ = true;
}
}
// Return all the versions.
std::vector<std::string>
Version_script_info::get_versions() const
{
std::vector<std::string> ret;
for (size_t j = 0; j < this->version_trees_.size(); ++j)
if (!this->version_trees_[j]->tag.empty())
ret.push_back(this->version_trees_[j]->tag);
return ret;
}
// Return the dependencies of VERSION.
std::vector<std::string>
Version_script_info::get_dependencies(const char* version) const
{
std::vector<std::string> ret;
for (size_t j = 0; j < this->version_trees_.size(); ++j)
if (this->version_trees_[j]->tag == version)
{
const struct Version_dependency_list* deps =
this->version_trees_[j]->dependencies;
if (deps != NULL)
for (size_t k = 0; k < deps->dependencies.size(); ++k)
ret.push_back(deps->dependencies[k]);
return ret;
}
return ret;
}
// A version script essentially maps a symbol name to a version tag
// and an indication of whether symbol is global or local within that
// version tag. Each symbol maps to at most one version tag.
// Unfortunately, in practice, version scripts are ambiguous, and list
// symbols multiple times. Thus, we have to document the matching
// process.
// This is a description of what the GNU linker does as of 2010-01-11.
// It walks through the version tags in the order in which they appear
// in the version script. For each tag, it first walks through the
// global patterns for that tag, then the local patterns. When
// looking at a single pattern, it first applies any language specific
// demangling as specified for the pattern, and then matches the
// resulting symbol name to the pattern. If it finds an exact match
// for a literal pattern (a pattern enclosed in quotes or with no
// wildcard characters), then that is the match that it uses. If
// finds a match with a wildcard pattern, then it saves it and
// continues searching. Wildcard patterns that are exactly "*" are
// saved separately.
// If no exact match with a literal pattern is ever found, then if a
// wildcard match with a global pattern was found it is used,
// otherwise if a wildcard match with a local pattern was found it is
// used.
// This is the result:
// * If there is an exact match, then we use the first tag in the
// version script where it matches.
// + If the exact match in that tag is global, it is used.
// + Otherwise the exact match in that tag is local, and is used.
// * Otherwise, if there is any match with a global wildcard pattern:
// + If there is any match with a wildcard pattern which is not
// "*", then we use the tag in which the *last* such pattern
// appears.
// + Otherwise, we matched "*". If there is no match with a local
// wildcard pattern which is not "*", then we use the *last*
// match with a global "*". Otherwise, continue.
// * Otherwise, if there is any match with a local wildcard pattern:
// + If there is any match with a wildcard pattern which is not
// "*", then we use the tag in which the *last* such pattern
// appears.
// + Otherwise, we matched "*", and we use the tag in which the
// *last* such match occurred.
// There is an additional wrinkle. When the GNU linker finds a symbol
// with a version defined in an object file due to a .symver
// directive, it looks up that symbol name in that version tag. If it
// finds it, it matches the symbol name against the patterns for that
// version. If there is no match with a global pattern, but there is
// a match with a local pattern, then the GNU linker marks the symbol
// as local.
// We want gold to be generally compatible, but we also want gold to
// be fast. These are the rules that gold implements:
// * If there is an exact match for the mangled name, we use it.
// + If there is more than one exact match, we give a warning, and
// we use the first tag in the script which matches.
// + If a symbol has an exact match as both global and local for
// the same version tag, we give an error.
// * Otherwise, we look for an extern C++ or an extern Java exact
// match. If we find an exact match, we use it.
// + If there is more than one exact match, we give a warning, and
// we use the first tag in the script which matches.
// + If a symbol has an exact match as both global and local for
// the same version tag, we give an error.
// * Otherwise, we look through the wildcard patterns, ignoring "*"
// patterns. We look through the version tags in reverse order.
// For each version tag, we look through the global patterns and
// then the local patterns. We use the first match we find (i.e.,
// the last matching version tag in the file).
// * Otherwise, we use the "*" pattern if there is one. We give an
// error if there are multiple "*" patterns.
// At least for now, gold does not look up the version tag for a
// symbol version found in an object file to see if it should be
// forced local. There are other ways to force a symbol to be local,
// and I don't understand why this one is useful.
// Build a set of fast lookup tables for a version script.
void
Version_script_info::build_lookup_tables()
{
size_t size = this->version_trees_.size();
for (size_t j = 0; j < size; ++j)
{
const Version_tree* v = this->version_trees_[j];
this->build_expression_list_lookup(v->local, v, false);
this->build_expression_list_lookup(v->global, v, true);
}
}
// If a pattern has backlashes but no unquoted wildcard characters,
// then we apply backslash unquoting and look for an exact match.
// Otherwise we treat it as a wildcard pattern. This function returns
// true for a wildcard pattern. Otherwise, it does backslash
// unquoting on *PATTERN and returns false. If this returns true,
// *PATTERN may have been partially unquoted.
bool
Version_script_info::unquote(std::string* pattern) const
{
bool saw_backslash = false;
size_t len = pattern->length();
size_t j = 0;
for (size_t i = 0; i < len; ++i)
{
if (saw_backslash)
saw_backslash = false;
else
{
switch ((*pattern)[i])
{
case '?': case '[': case '*':
return true;
case '\\':
saw_backslash = true;
continue;
default:
break;
}
}
if (i != j)
(*pattern)[j] = (*pattern)[i];
++j;
}
return false;
}
// Add an exact match for MATCH to *PE. The result of the match is
// V/IS_GLOBAL.
void
Version_script_info::add_exact_match(const std::string& match,
const Version_tree* v, bool is_global,
const Version_expression* ve,
Exact* pe)
{
std::pair<Exact::iterator, bool> ins =
pe->insert(std::make_pair(match, Version_tree_match(v, is_global, ve)));
if (ins.second)
{
// This is the first time we have seen this match.
return;
}
Version_tree_match& vtm(ins.first->second);
if (vtm.real->tag != v->tag)
{
// This is an ambiguous match. We still return the
// first version that we found in the script, but we
// record the new version to issue a warning if we
// wind up looking up this symbol.
if (vtm.ambiguous == NULL)
vtm.ambiguous = v;
}
else if (is_global != vtm.is_global)
{
// We have a match for both the global and local entries for a
// version tag. That's got to be wrong.
gold_error(_("'%s' appears as both a global and a local symbol "
"for version '%s' in script"),
match.c_str(), v->tag.c_str());
}
}
// Build fast lookup information for EXPLIST and store it in LOOKUP.
// All matches go to V, and IS_GLOBAL is true if they are global
// matches.
void
Version_script_info::build_expression_list_lookup(
const Version_expression_list* explist,
const Version_tree* v,
bool is_global)
{
if (explist == NULL)
return;
size_t size = explist->expressions.size();
for (size_t i = 0; i < size; ++i)
{
const Version_expression& exp(explist->expressions[i]);
if (exp.pattern.length() == 1 && exp.pattern[0] == '*')
{
if (this->default_version_ != NULL
&& this->default_version_->tag != v->tag)
gold_warning(_("wildcard match appears in both version '%s' "
"and '%s' in script"),
this->default_version_->tag.c_str(), v->tag.c_str());
else if (this->default_version_ != NULL
&& this->default_is_global_ != is_global)
gold_error(_("wildcard match appears as both global and local "
"in version '%s' in script"),
v->tag.c_str());
this->default_version_ = v;
this->default_is_global_ = is_global;
continue;
}
std::string pattern = exp.pattern;
if (!exp.exact_match)
{
if (this->unquote(&pattern))
{
this->globs_.push_back(Glob(&exp, v, is_global));
continue;
}
}
if (this->exact_[exp.language] == NULL)
this->exact_[exp.language] = new Exact();
this->add_exact_match(pattern, v, is_global, &exp,
this->exact_[exp.language]);
}
}
// Return the name to match given a name, a language code, and two
// lazy demanglers.
const char*
Version_script_info::get_name_to_match(const char* name,
int language,
Lazy_demangler* cpp_demangler,
Lazy_demangler* java_demangler) const
{
switch (language)
{
case LANGUAGE_C:
return name;
case LANGUAGE_CXX:
return cpp_demangler->get();
case LANGUAGE_JAVA:
return java_demangler->get();
default:
gold_unreachable();
}
}
// Look up SYMBOL_NAME in the list of versions. Return true if the
// symbol is found, false if not. If the symbol is found, then if
// PVERSION is not NULL, set *PVERSION to the version tag, and if
// P_IS_GLOBAL is not NULL, set *P_IS_GLOBAL according to whether the
// symbol is global or not.
bool
Version_script_info::get_symbol_version(const char* symbol_name,
std::string* pversion,
bool* p_is_global) const
{
Lazy_demangler cpp_demangled_name(symbol_name, DMGL_ANSI | DMGL_PARAMS);
Lazy_demangler java_demangled_name(symbol_name,
DMGL_ANSI | DMGL_PARAMS | DMGL_JAVA);
gold_assert(this->is_finalized_);
for (int i = 0; i < LANGUAGE_COUNT; ++i)
{
Exact* exact = this->exact_[i];
if (exact == NULL)
continue;
const char* name_to_match = this->get_name_to_match(symbol_name, i,
&cpp_demangled_name,
&java_demangled_name);
if (name_to_match == NULL)
{
// If the name can not be demangled, the GNU linker goes
// ahead and tries to match it anyhow. That does not
// make sense to me and I have not implemented it.
continue;
}
Exact::const_iterator pe = exact->find(name_to_match);
if (pe != exact->end())
{
const Version_tree_match& vtm(pe->second);
if (vtm.ambiguous != NULL)
gold_warning(_("using '%s' as version for '%s' which is also "
"named in version '%s' in script"),
vtm.real->tag.c_str(), name_to_match,
vtm.ambiguous->tag.c_str());
if (pversion != NULL)
*pversion = vtm.real->tag;
if (p_is_global != NULL)
*p_is_global = vtm.is_global;
// If we are using --no-undefined-version, and this is a
// global symbol, we have to record that we have found this
// symbol, so that we don't warn about it. We have to do
// this now, because otherwise we have no way to get from a
// non-C language back to the demangled name that we
// matched.
if (p_is_global != NULL && vtm.is_global)
vtm.expression->was_matched_by_symbol = true;
return true;
}
}
// Look through the glob patterns in reverse order.
for (Globs::const_reverse_iterator p = this->globs_.rbegin();
p != this->globs_.rend();
++p)
{
int language = p->expression->language;
const char* name_to_match = this->get_name_to_match(symbol_name,
language,
&cpp_demangled_name,
&java_demangled_name);
if (name_to_match == NULL)
continue;
if (fnmatch(p->expression->pattern.c_str(), name_to_match,
FNM_NOESCAPE) == 0)
{
if (pversion != NULL)
*pversion = p->version->tag;
if (p_is_global != NULL)
*p_is_global = p->is_global;
return true;
}
}
// Finally, there may be a wildcard.
if (this->default_version_ != NULL)
{
if (pversion != NULL)
*pversion = this->default_version_->tag;
if (p_is_global != NULL)
*p_is_global = this->default_is_global_;
return true;
}
return false;
}
// Give an error if any exact symbol names (not wildcards) appear in a
// version script, but there is no such symbol.
void
Version_script_info::check_unmatched_names(const Symbol_table* symtab) const
{
for (size_t i = 0; i < this->version_trees_.size(); ++i)
{
const Version_tree* vt = this->version_trees_[i];
if (vt->global == NULL)
continue;
for (size_t j = 0; j < vt->global->expressions.size(); ++j)
{
const Version_expression& expression(vt->global->expressions[j]);
// Ignore cases where we used the version because we saw a
// symbol that we looked up. Note that
// WAS_MATCHED_BY_SYMBOL will be true even if the symbol was
// not a definition. That's OK as in that case we most
// likely gave an undefined symbol error anyhow.
if (expression.was_matched_by_symbol)
continue;
// Just ignore names which are in languages other than C.
// We have no way to look them up in the symbol table.
if (expression.language != LANGUAGE_C)
continue;
// Remove backslash quoting, and ignore wildcard patterns.
std::string pattern = expression.pattern;
if (!expression.exact_match)
{
if (this->unquote(&pattern))
continue;
}
if (symtab->lookup(pattern.c_str(), vt->tag.c_str()) == NULL)
gold_error(_("version script assignment of %s to symbol %s "
"failed: symbol not defined"),
vt->tag.c_str(), pattern.c_str());
}
}
}
struct Version_dependency_list*
Version_script_info::allocate_dependency_list()
{
dependency_lists_.push_back(new Version_dependency_list);
return dependency_lists_.back();
}
struct Version_expression_list*
Version_script_info::allocate_expression_list()
{
expression_lists_.push_back(new Version_expression_list);
return expression_lists_.back();
}
struct Version_tree*
Version_script_info::allocate_version_tree()
{
version_trees_.push_back(new Version_tree);
return version_trees_.back();
}
// Print for debugging.
void
Version_script_info::print(FILE* f) const
{
if (this->empty())
return;
fprintf(f, "VERSION {");
for (size_t i = 0; i < this->version_trees_.size(); ++i)
{
const Version_tree* vt = this->version_trees_[i];
if (vt->tag.empty())
fprintf(f, " {\n");
else
fprintf(f, " %s {\n", vt->tag.c_str());
if (vt->global != NULL)
{
fprintf(f, " global :\n");
this->print_expression_list(f, vt->global);
}
if (vt->local != NULL)
{
fprintf(f, " local :\n");
this->print_expression_list(f, vt->local);
}
fprintf(f, " }");
if (vt->dependencies != NULL)
{
const Version_dependency_list* deps = vt->dependencies;
for (size_t j = 0; j < deps->dependencies.size(); ++j)
{
if (j < deps->dependencies.size() - 1)
fprintf(f, "\n");
fprintf(f, " %s", deps->dependencies[j].c_str());
}
}
fprintf(f, ";\n");
}
fprintf(f, "}\n");
}
void
Version_script_info::print_expression_list(
FILE* f,
const Version_expression_list* vel) const
{
Version_script_info::Language current_language = LANGUAGE_C;
for (size_t i = 0; i < vel->expressions.size(); ++i)
{
const Version_expression& ve(vel->expressions[i]);
if (ve.language != current_language)
{
if (current_language != LANGUAGE_C)
fprintf(f, " }\n");
switch (ve.language)
{
case LANGUAGE_C:
break;
case LANGUAGE_CXX:
fprintf(f, " extern \"C++\" {\n");
break;
case LANGUAGE_JAVA:
fprintf(f, " extern \"Java\" {\n");
break;
default:
gold_unreachable();
}
current_language = ve.language;
}
fprintf(f, " ");
if (current_language != LANGUAGE_C)
fprintf(f, " ");
if (ve.exact_match)
fprintf(f, "\"");
fprintf(f, "%s", ve.pattern.c_str());
if (ve.exact_match)
fprintf(f, "\"");
fprintf(f, "\n");
}
if (current_language != LANGUAGE_C)
fprintf(f, " }\n");
}
} // End namespace gold.
// The remaining functions are extern "C", so it's clearer to not put
// them in namespace gold.
using namespace gold;
// This function is called by the bison parser to return the next
// token.
extern "C" int
yylex(YYSTYPE* lvalp, void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
const Token* token = closure->next_token();
switch (token->classification())
{
default:
gold_unreachable();
case Token::TOKEN_INVALID:
yyerror(closurev, "invalid character");
return 0;
case Token::TOKEN_EOF:
return 0;
case Token::TOKEN_STRING:
{
// This is either a keyword or a STRING.
size_t len;
const char* str = token->string_value(&len);
int parsecode = 0;
switch (closure->lex_mode())
{
case Lex::LINKER_SCRIPT:
parsecode = script_keywords.keyword_to_parsecode(str, len);
break;
case Lex::VERSION_SCRIPT:
parsecode = version_script_keywords.keyword_to_parsecode(str, len);
break;
case Lex::DYNAMIC_LIST:
parsecode = dynamic_list_keywords.keyword_to_parsecode(str, len);
break;
default:
break;
}
if (parsecode != 0)
return parsecode;
lvalp->string.value = str;
lvalp->string.length = len;
return STRING;
}
case Token::TOKEN_QUOTED_STRING:
lvalp->string.value = token->string_value(&lvalp->string.length);
return QUOTED_STRING;
case Token::TOKEN_OPERATOR:
return token->operator_value();
case Token::TOKEN_INTEGER:
lvalp->integer = token->integer_value();
return INTEGER;
}
}
// This function is called by the bison parser to report an error.
extern "C" void
yyerror(void* closurev, const char* message)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
gold_error(_("%s:%d:%d: %s"), closure->filename(), closure->lineno(),
closure->charpos(), message);
}
// Called by the bison parser to add an external symbol to the link.
extern "C" void
script_add_extern(void* closurev, const char* name, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->add_symbol_reference(name, length);
}
// Called by the bison parser to add a file to the link.
extern "C" void
script_add_file(void* closurev, const char* name, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
// If this is an absolute path, and we found the script in the
// sysroot, then we want to prepend the sysroot to the file name.
// For example, this is how we handle a cross link to the x86_64
// libc.so, which refers to /lib/libc.so.6.
std::string name_string(name, length);
const char* extra_search_path = ".";
std::string script_directory;
if (IS_ABSOLUTE_PATH(name_string.c_str()))
{
if (closure->is_in_sysroot())
{
const std::string& sysroot(parameters->options().sysroot());
gold_assert(!sysroot.empty());
name_string = sysroot + name_string;
}
}
else
{
// In addition to checking the normal library search path, we
// also want to check in the script-directory.
const char* slash = strrchr(closure->filename(), '/');
if (slash != NULL)
{
script_directory.assign(closure->filename(),
slash - closure->filename() + 1);
extra_search_path = script_directory.c_str();
}
}
Input_file_argument file(name_string.c_str(),
Input_file_argument::INPUT_FILE_TYPE_FILE,
extra_search_path, false,
closure->position_dependent_options());
Input_argument& arg = closure->inputs()->add_file(file);
arg.set_script_info(closure->script_info());
}
// Called by the bison parser to add a library to the link.
extern "C" void
script_add_library(void* closurev, const char* name, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
std::string name_string(name, length);
if (name_string[0] != 'l')
gold_error(_("library name must be prefixed with -l"));
Input_file_argument file(name_string.c_str() + 1,
Input_file_argument::INPUT_FILE_TYPE_LIBRARY,
"", false,
closure->position_dependent_options());
Input_argument& arg = closure->inputs()->add_file(file);
arg.set_script_info(closure->script_info());
}
// Called by the bison parser to start a group. If we are already in
// a group, that means that this script was invoked within a
// --start-group --end-group sequence on the command line, or that
// this script was found in a GROUP of another script. In that case,
// we simply continue the existing group, rather than starting a new
// one. It is possible to construct a case in which this will do
// something other than what would happen if we did a recursive group,
// but it's hard to imagine why the different behaviour would be
// useful for a real program. Avoiding recursive groups is simpler
// and more efficient.
extern "C" void
script_start_group(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (!closure->in_group())
closure->inputs()->start_group();
}
// Called by the bison parser at the end of a group.
extern "C" void
script_end_group(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (!closure->in_group())
closure->inputs()->end_group();
}
// Called by the bison parser to start an AS_NEEDED list.
extern "C" void
script_start_as_needed(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->position_dependent_options().set_as_needed(true);
}
// Called by the bison parser at the end of an AS_NEEDED list.
extern "C" void
script_end_as_needed(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->position_dependent_options().set_as_needed(false);
}
// Called by the bison parser to set the entry symbol.
extern "C" void
script_set_entry(void* closurev, const char* entry, size_t length)
{
// We'll parse this exactly the same as --entry=ENTRY on the commandline
// TODO(csilvers): FIXME -- call set_entry directly.
std::string arg("--entry=");
arg.append(entry, length);
script_parse_option(closurev, arg.c_str(), arg.size());
}
// Called by the bison parser to set whether to define common symbols.
extern "C" void
script_set_common_allocation(void* closurev, int set)
{
const char* arg = set != 0 ? "--define-common" : "--no-define-common";
script_parse_option(closurev, arg, strlen(arg));
}
// Called by the bison parser to refer to a symbol.
extern "C" Expression*
script_symbol(void* closurev, const char* name, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (length != 1 || name[0] != '.')
closure->script_options()->add_symbol_reference(name, length);
return script_exp_string(name, length);
}
// Called by the bison parser to define a symbol.
extern "C" void
script_set_symbol(void* closurev, const char* name, size_t length,
Expression* value, int providei, int hiddeni)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
const bool provide = providei != 0;
const bool hidden = hiddeni != 0;
closure->script_options()->add_symbol_assignment(name, length,
closure->parsing_defsym(),
value, provide, hidden);
closure->clear_skip_on_incompatible_target();
}
// Called by the bison parser to add an assertion.
extern "C" void
script_add_assertion(void* closurev, Expression* check, const char* message,
size_t messagelen)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->add_assertion(check, message, messagelen);
closure->clear_skip_on_incompatible_target();
}
// Called by the bison parser to parse an OPTION.
extern "C" void
script_parse_option(void* closurev, const char* option, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
// We treat the option as a single command-line option, even if
// it has internal whitespace.
if (closure->command_line() == NULL)
{
// There are some options that we could handle here--e.g.,
// -lLIBRARY. Should we bother?
gold_warning(_("%s:%d:%d: ignoring command OPTION; OPTION is only valid"
" for scripts specified via -T/--script"),
closure->filename(), closure->lineno(), closure->charpos());
}
else
{
bool past_a_double_dash_option = false;
const char* mutable_option = strndup(option, length);
gold_assert(mutable_option != NULL);
closure->command_line()->process_one_option(1, &mutable_option, 0,
&past_a_double_dash_option);
// The General_options class will quite possibly store a pointer
// into mutable_option, so we can't free it. In cases the class
// does not store such a pointer, this is a memory leak. Alas. :(
}
closure->clear_skip_on_incompatible_target();
}
// Called by the bison parser to handle OUTPUT_FORMAT. OUTPUT_FORMAT
// takes either one or three arguments. In the three argument case,
// the format depends on the endianness option, which we don't
// currently support (FIXME). If we see an OUTPUT_FORMAT for the
// wrong format, then we want to search for a new file. Returning 0
// here will cause the parser to immediately abort.
extern "C" int
script_check_output_format(void* closurev,
const char* default_name, size_t default_length,
const char*, size_t, const char*, size_t)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
std::string name(default_name, default_length);
Target* target = select_target_by_bfd_name(name.c_str());
if (target == NULL || !parameters->is_compatible_target(target))
{
if (closure->skip_on_incompatible_target())
{
closure->set_found_incompatible_target();
return 0;
}
// FIXME: Should we warn about the unknown target?
}
return 1;
}
// Called by the bison parser to handle TARGET.
extern "C" void
script_set_target(void* closurev, const char* target, size_t len)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
std::string s(target, len);
General_options::Object_format format_enum;
format_enum = General_options::string_to_object_format(s.c_str());
closure->position_dependent_options().set_format_enum(format_enum);
}
// Called by the bison parser to handle SEARCH_DIR. This is handled
// exactly like a -L option.
extern "C" void
script_add_search_dir(void* closurev, const char* option, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (closure->command_line() == NULL)
gold_warning(_("%s:%d:%d: ignoring SEARCH_DIR; SEARCH_DIR is only valid"
" for scripts specified via -T/--script"),
closure->filename(), closure->lineno(), closure->charpos());
else if (!closure->command_line()->options().nostdlib())
{
std::string s = "-L" + std::string(option, length);
script_parse_option(closurev, s.c_str(), s.size());
}
}
/* Called by the bison parser to push the lexer into expression
mode. */
extern "C" void
script_push_lex_into_expression_mode(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->push_lex_mode(Lex::EXPRESSION);
}
/* Called by the bison parser to push the lexer into version
mode. */
extern "C" void
script_push_lex_into_version_mode(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (closure->version_script()->is_finalized())
gold_error(_("%s:%d:%d: invalid use of VERSION in input file"),
closure->filename(), closure->lineno(), closure->charpos());
closure->push_lex_mode(Lex::VERSION_SCRIPT);
}
/* Called by the bison parser to pop the lexer mode. */
extern "C" void
script_pop_lex_mode(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->pop_lex_mode();
}
// Register an entire version node. For example:
//
// GLIBC_2.1 {
// global: foo;
// } GLIBC_2.0;
//
// - tag is "GLIBC_2.1"
// - tree contains the information "global: foo"
// - deps contains "GLIBC_2.0"
extern "C" void
script_register_vers_node(void*,
const char* tag,
int taglen,
struct Version_tree* tree,
struct Version_dependency_list* deps)
{
gold_assert(tree != NULL);
tree->dependencies = deps;
if (tag != NULL)
tree->tag = std::string(tag, taglen);
}
// Add a dependencies to the list of existing dependencies, if any,
// and return the expanded list.
extern "C" struct Version_dependency_list*
script_add_vers_depend(void* closurev,
struct Version_dependency_list* all_deps,
const char* depend_to_add, int deplen)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (all_deps == NULL)
all_deps = closure->version_script()->allocate_dependency_list();
all_deps->dependencies.push_back(std::string(depend_to_add, deplen));
return all_deps;
}
// Add a pattern expression to an existing list of expressions, if any.
extern "C" struct Version_expression_list*
script_new_vers_pattern(void* closurev,
struct Version_expression_list* expressions,
const char* pattern, int patlen, int exact_match)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (expressions == NULL)
expressions = closure->version_script()->allocate_expression_list();
expressions->expressions.push_back(
Version_expression(std::string(pattern, patlen),
closure->get_current_language(),
static_cast<bool>(exact_match)));
return expressions;
}
// Attaches b to the end of a, and clears b. So a = a + b and b = {}.
extern "C" struct Version_expression_list*
script_merge_expressions(struct Version_expression_list* a,
struct Version_expression_list* b)
{
a->expressions.insert(a->expressions.end(),
b->expressions.begin(), b->expressions.end());
// We could delete b and remove it from expressions_lists_, but
// that's a lot of work. This works just as well.
b->expressions.clear();
return a;
}
// Combine the global and local expressions into a a Version_tree.
extern "C" struct Version_tree*
script_new_vers_node(void* closurev,
struct Version_expression_list* global,
struct Version_expression_list* local)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
Version_tree* tree = closure->version_script()->allocate_version_tree();
tree->global = global;
tree->local = local;
return tree;
}
// Handle a transition in language, such as at the
// start or end of 'extern "C++"'
extern "C" void
version_script_push_lang(void* closurev, const char* lang, int langlen)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
std::string language(lang, langlen);
Version_script_info::Language code;
if (language.empty() || language == "C")
code = Version_script_info::LANGUAGE_C;
else if (language == "C++")
code = Version_script_info::LANGUAGE_CXX;
else if (language == "Java")
code = Version_script_info::LANGUAGE_JAVA;
else
{
char* buf = new char[langlen + 100];
snprintf(buf, langlen + 100,
_("unrecognized version script language '%s'"),
language.c_str());
yyerror(closurev, buf);
delete[] buf;
code = Version_script_info::LANGUAGE_C;
}
closure->push_language(code);
}
extern "C" void
version_script_pop_lang(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->pop_language();
}
// Called by the bison parser to start a SECTIONS clause.
extern "C" void
script_start_sections(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->script_sections()->start_sections();
closure->clear_skip_on_incompatible_target();
}
// Called by the bison parser to finish a SECTIONS clause.
extern "C" void
script_finish_sections(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->script_sections()->finish_sections();
}
// Start processing entries for an output section.
extern "C" void
script_start_output_section(void* closurev, const char* name, size_t namelen,
const struct Parser_output_section_header* header)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->script_sections()->start_output_section(name,
namelen,
header);
}
// Finish processing entries for an output section.
extern "C" void
script_finish_output_section(void* closurev,
const struct Parser_output_section_trailer* trail)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->script_sections()->finish_output_section(trail);
}
// Add a data item (e.g., "WORD (0)") to the current output section.
extern "C" void
script_add_data(void* closurev, int data_token, Expression* val)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
int size;
bool is_signed = true;
switch (data_token)
{
case QUAD:
size = 8;
is_signed = false;
break;
case SQUAD:
size = 8;
break;
case LONG:
size = 4;
break;
case SHORT:
size = 2;
break;
case BYTE:
size = 1;
break;
default:
gold_unreachable();
}
closure->script_options()->script_sections()->add_data(size, is_signed, val);
}
// Add a clause setting the fill value to the current output section.
extern "C" void
script_add_fill(void* closurev, Expression* val)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
closure->script_options()->script_sections()->add_fill(val);
}
// Add a new input section specification to the current output
// section.
extern "C" void
script_add_input_section(void* closurev,
const struct Input_section_spec* spec,
int keepi)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
bool keep = keepi != 0;
closure->script_options()->script_sections()->add_input_section(spec, keep);
}
// When we see DATA_SEGMENT_ALIGN we record that following output
// sections may be relro.
extern "C" void
script_data_segment_align(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (!closure->script_options()->saw_sections_clause())
gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
closure->filename(), closure->lineno(), closure->charpos());
else
closure->script_options()->script_sections()->data_segment_align();
}
// When we see DATA_SEGMENT_RELRO_END we know that all output sections
// since DATA_SEGMENT_ALIGN should be relro.
extern "C" void
script_data_segment_relro_end(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (!closure->script_options()->saw_sections_clause())
gold_error(_("%s:%d:%d: DATA_SEGMENT_ALIGN not in SECTIONS clause"),
closure->filename(), closure->lineno(), closure->charpos());
else
closure->script_options()->script_sections()->data_segment_relro_end();
}
// Create a new list of string/sort pairs.
extern "C" String_sort_list_ptr
script_new_string_sort_list(const struct Wildcard_section* string_sort)
{
return new String_sort_list(1, *string_sort);
}
// Add an entry to a list of string/sort pairs. The way the parser
// works permits us to simply modify the first parameter, rather than
// copy the vector.
extern "C" String_sort_list_ptr
script_string_sort_list_add(String_sort_list_ptr pv,
const struct Wildcard_section* string_sort)
{
if (pv == NULL)
return script_new_string_sort_list(string_sort);
else
{
pv->push_back(*string_sort);
return pv;
}
}
// Create a new list of strings.
extern "C" String_list_ptr
script_new_string_list(const char* str, size_t len)
{
return new String_list(1, std::string(str, len));
}
// Add an element to a list of strings. The way the parser works
// permits us to simply modify the first parameter, rather than copy
// the vector.
extern "C" String_list_ptr
script_string_list_push_back(String_list_ptr pv, const char* str, size_t len)
{
if (pv == NULL)
return script_new_string_list(str, len);
else
{
pv->push_back(std::string(str, len));
return pv;
}
}
// Concatenate two string lists. Either or both may be NULL. The way
// the parser works permits us to modify the parameters, rather than
// copy the vector.
extern "C" String_list_ptr
script_string_list_append(String_list_ptr pv1, String_list_ptr pv2)
{
if (pv1 == NULL)
return pv2;
if (pv2 == NULL)
return pv1;
pv1->insert(pv1->end(), pv2->begin(), pv2->end());
return pv1;
}
// Add a new program header.
extern "C" void
script_add_phdr(void* closurev, const char* name, size_t namelen,
unsigned int type, const Phdr_info* info)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
bool includes_filehdr = info->includes_filehdr != 0;
bool includes_phdrs = info->includes_phdrs != 0;
bool is_flags_valid = info->is_flags_valid != 0;
Script_sections* ss = closure->script_options()->script_sections();
ss->add_phdr(name, namelen, type, includes_filehdr, includes_phdrs,
is_flags_valid, info->flags, info->load_address);
closure->clear_skip_on_incompatible_target();
}
// Convert a program header string to a type.
#define PHDR_TYPE(NAME) { #NAME, sizeof(#NAME) - 1, elfcpp::NAME }
static struct
{
const char* name;
size_t namelen;
unsigned int val;
} phdr_type_names[] =
{
PHDR_TYPE(PT_NULL),
PHDR_TYPE(PT_LOAD),
PHDR_TYPE(PT_DYNAMIC),
PHDR_TYPE(PT_INTERP),
PHDR_TYPE(PT_NOTE),
PHDR_TYPE(PT_SHLIB),
PHDR_TYPE(PT_PHDR),
PHDR_TYPE(PT_TLS),
PHDR_TYPE(PT_GNU_EH_FRAME),
PHDR_TYPE(PT_GNU_STACK),
PHDR_TYPE(PT_GNU_RELRO)
};
extern "C" unsigned int
script_phdr_string_to_type(void* closurev, const char* name, size_t namelen)
{
for (unsigned int i = 0;
i < sizeof(phdr_type_names) / sizeof(phdr_type_names[0]);
++i)
if (namelen == phdr_type_names[i].namelen
&& strncmp(name, phdr_type_names[i].name, namelen) == 0)
return phdr_type_names[i].val;
yyerror(closurev, _("unknown PHDR type (try integer)"));
return elfcpp::PT_NULL;
}
extern "C" void
script_saw_segment_start_expression(void* closurev)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
Script_sections* ss = closure->script_options()->script_sections();
ss->set_saw_segment_start_expression(true);
}
extern "C" void
script_set_section_region(void* closurev, const char* name, size_t namelen,
int set_vma)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
if (!closure->script_options()->saw_sections_clause())
{
gold_error(_("%s:%d:%d: MEMORY region '%.*s' referred to outside of "
"SECTIONS clause"),
closure->filename(), closure->lineno(), closure->charpos(),
static_cast<int>(namelen), name);
return;
}
Script_sections* ss = closure->script_options()->script_sections();
Memory_region* mr = ss->find_memory_region(name, namelen);
if (mr == NULL)
{
gold_error(_("%s:%d:%d: MEMORY region '%.*s' not declared"),
closure->filename(), closure->lineno(), closure->charpos(),
static_cast<int>(namelen), name);
return;
}
ss->set_memory_region(mr, set_vma);
}
extern "C" void
script_add_memory(void* closurev, const char* name, size_t namelen,
unsigned int attrs, Expression* origin, Expression* length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
Script_sections* ss = closure->script_options()->script_sections();
ss->add_memory_region(name, namelen, attrs, origin, length);
}
extern "C" unsigned int
script_parse_memory_attr(void* closurev, const char* attrs, size_t attrlen,
int invert)
{
int attributes = 0;
while (attrlen--)
switch (*attrs++)
{
case 'R':
case 'r':
attributes |= MEM_READABLE; break;
case 'W':
case 'w':
attributes |= MEM_READABLE | MEM_WRITEABLE; break;
case 'X':
case 'x':
attributes |= MEM_EXECUTABLE; break;
case 'A':
case 'a':
attributes |= MEM_ALLOCATABLE; break;
case 'I':
case 'i':
case 'L':
case 'l':
attributes |= MEM_INITIALIZED; break;
default:
yyerror(closurev, _("unknown MEMORY attribute"));
}
if (invert)
attributes = (~ attributes) & MEM_ATTR_MASK;
return attributes;
}
extern "C" void
script_include_directive(int first_token, void* closurev,
const char* filename, size_t length)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
std::string name(filename, length);
Command_line* cmdline = closure->command_line();
read_script_file(name.c_str(), cmdline, &cmdline->script_options(),
first_token, Lex::LINKER_SCRIPT);
}
// Functions for memory regions.
extern "C" Expression*
script_exp_function_origin(void* closurev, const char* name, size_t namelen)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
Script_sections* ss = closure->script_options()->script_sections();
Expression* origin = ss->find_memory_region_origin(name, namelen);
if (origin == NULL)
{
gold_error(_("undefined memory region '%s' referenced "
"in ORIGIN expression"),
name);
// Create a dummy expression to prevent crashes later on.
origin = script_exp_integer(0);
}
return origin;
}
extern "C" Expression*
script_exp_function_length(void* closurev, const char* name, size_t namelen)
{
Parser_closure* closure = static_cast<Parser_closure*>(closurev);
Script_sections* ss = closure->script_options()->script_sections();
Expression* length = ss->find_memory_region_length(name, namelen);
if (length == NULL)
{
gold_error(_("undefined memory region '%s' referenced "
"in LENGTH expression"),
name);
// Create a dummy expression to prevent crashes later on.
length = script_exp_integer(0);
}
return length;
}
|