avr/qmk/ChibiOS - [no description]

about summary refs log tree commit diff stats

diff options

Diffstat (limited to 'demos/PPC-SPC563-GCC/main.c')

0 files changed, 0 insertions, 0 deletions

n57'>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

--  GHDL Run Time (GRT) - signals management.
--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
--  GHDL 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 2, or (at your option) any later
--  version.
--
--  GHDL 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 GCC; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
with System; use System;
with System.Storage_Elements; --  Work around GNAT bug.
with Ada.Unchecked_Deallocation;
with Ada.Unchecked_Conversion;
with Grt.Errors; use Grt.Errors;
with Grt.Processes; use Grt.Processes;
with Grt.Options; use Grt.Options;
with Grt.Rtis_Types; use Grt.Rtis_Types;
with Grt.Disp_Signals;
with Grt.Astdio;
with Grt.Stdio;
with Grt.Threads; use Grt.Threads;

package body Grt.Signals is
   function Is_Signal_Guarded (Sig : Ghdl_Signal_Ptr) return Boolean
   is
   begin
      return (Sig.Rti.Common.Mode and Ghdl_Rti_Signal_Kind_Mask)
        /= Ghdl_Rti_Signal_Kind_No;
   end Is_Signal_Guarded;

   Sig_Rti : Ghdl_Rtin_Object_Acc;
   Last_Implicit_Signal : Ghdl_Signal_Ptr;
   Current_Resolv : Resolved_Signal_Acc := null;

   function Get_Current_Mode_Signal return Mode_Signal_Type
   is
   begin
      return Mode_Signal_Type'Val
        (Sig_Rti.Common.Mode and Ghdl_Rti_Signal_Mode_Mask);
   end Get_Current_Mode_Signal;


   procedure Ghdl_Signal_Name_Rti (Sig : Ghdl_Rti_Access;
                                   Ctxt : Ghdl_Rti_Access;
                                   Addr : Address)
   is
      pragma Unreferenced (Ctxt);
      pragma Unreferenced (Addr);
   begin
      Sig_Rti := To_Ghdl_Rtin_Object_Acc (Sig);
   end Ghdl_Signal_Name_Rti;

   function To_Address is new Ada.Unchecked_Conversion
     (Source => Ghdl_Signal_Ptr, Target => Address);

   function Create_Signal
     (Mode : Mode_Type;
      Init_Val : Value_Union;
      Mode_Sig : Mode_Signal_Type;
      Resolv_Proc : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
      Res : Ghdl_Signal_Ptr;
      Resolv : Resolved_Signal_Acc;
      S : Ghdl_Signal_Data (Mode_Sig);
   begin
      Sig_Table.Increment_Last;

      if Current_Resolv = null then
         if Resolv_Proc /= Null_Address then
            Resolv := new Resolved_Signal_Type'
              (Resolv_Proc => Resolv_Proc,
               Resolv_Inst => Resolv_Inst,
               Resolv_Ptr => Null_Address,
               Sig_Range => (Sig_Table.Last, Sig_Table.Last),
               Disconnect_Time => Bad_Time);
         else
            Resolv := null;
         end if;
      else
         if Resolv_Proc /= Null_Address then
            --  Only one resolution function is allowed!
            Internal_Error ("create_signal");
         end if;
         Resolv := Current_Resolv;
         if Current_Resolv.Sig_Range.Last = Sig_Table.Last then
            Current_Resolv := null;
         end if;
      end if;

      case Mode_Sig is
         when Mode_Signal_User =>
            S.Nbr_Drivers := 0;
            S.Drivers := null;
            S.Effective := null;
            S.Resolv := Resolv;
         when Mode_Conv_In
           | Mode_Conv_Out =>
            S.Conv := null;
         when Mode_Stable
           | Mode_Quiet
           | Mode_Delayed =>
            S.Time := 0;
         when Mode_Guard =>
            S.Guard_Func := null;
            S.Guard_Instance := System.Null_Address;
         when Mode_Transaction
           | Mode_End =>
            null;
      end case;

      Res := new Ghdl_Signal'(Value => Init_Val,
                              Driving_Value => Init_Val,
                              Last_Value => Init_Val,
                              --  Note: use -Std_Time'last instead of
                              --  Std_Time'First so that NOW - x'last_event
                              --  returns time'high at initialization!
                              Last_Event => -Std_Time'Last,
                              Last_Active => -Std_Time'Last,
                              Event => False,
                              Active => False,

                              Mode => Mode,
                              Flags => (Propag => Propag_None,
                                        Has_Active => False,
                                        Is_Dumped => False,
                                        Cyc_Event => False),

                              Net => No_Signal_Net,
                              Link => null,
                              Alink => null,
                              Flink => null,

                              Event_List => null,
                              Rti => Sig_Rti,

                              Nbr_Ports => 0,
                              Ports => null,

                              S => S);

      if Resolv /= null and then Resolv.Resolv_Ptr = System.Null_Address then
         Resolv.Resolv_Ptr := To_Address (Res);
      end if;

      case Flag_Activity is
         when Activity_All =>
            Res.Flags.Has_Active := True;
         when Activity_Minimal =>
            if (Sig_Rti.Common.Mode and Ghdl_Rti_Signal_Has_Active) /= 0 then
               Res.Flags.Has_Active := True;
            end if;
         when Activity_None =>
            Res.Flags.Has_Active := False;
      end case;

      --  Put the signal in the table.
      Sig_Table.Table (Sig_Table.Last) := Res;

      return Res;
   end Create_Signal;

   procedure Ghdl_Signal_Init (Sig : Ghdl_Signal_Ptr; Val : Value_Union) is
   begin
      Sig.Value := Val;
      Sig.Driving_Value := Val;
      Sig.Last_Value := Val;
   end Ghdl_Signal_Init;

   procedure Ghdl_Signal_Merge_Rti (Sig : Ghdl_Signal_Ptr;
                                    Rti : Ghdl_Rti_Access)
   is
      S_Rti : Ghdl_Rtin_Object_Acc;
   begin
      S_Rti := To_Ghdl_Rtin_Object_Acc (Rti);
      if Flag_Activity = Activity_Minimal then
         if (S_Rti.Common.Mode and Ghdl_Rti_Signal_Has_Active) /= 0 then
            Sig.Flags.Has_Active := True;
         end if;
      end if;
   end Ghdl_Signal_Merge_Rti;

   procedure Ghdl_Signal_Create_Resolution (Proc : System.Address;
                                            Instance : System.Address;
                                            Sig : System.Address;
                                            Nbr_Sig : Ghdl_Index_Type)
   is
   begin
      if Current_Resolv /= null then
         Internal_Error ("Ghdl_Signal_Create_Resolution");
      end if;
      Current_Resolv := new Resolved_Signal_Type'
        (Resolv_Proc => Proc,
         Resolv_Inst => Instance,
         Resolv_Ptr => Sig,
         Sig_Range => (First => Sig_Table.Last + 1,
                       Last => Sig_Table.Last + Sig_Table_Index (Nbr_Sig)),
         Disconnect_Time => Bad_Time);
   end Ghdl_Signal_Create_Resolution;

   procedure Check_New_Source (Sig : Ghdl_Signal_Ptr)
   is
      use Grt.Stdio;
      use Grt.Astdio;
   begin
      if Sig.S.Nbr_Drivers + Sig.Nbr_Ports > 0 then
         if Sig.S.Resolv = null then
            --  LRM 4.3.1.2 Signal Declaration
            --  It is an error if, after the elaboration of a description, a
            --  signal has multiple sources and it is not a resolved signal.
            Put ("for signal: ");
            Disp_Signals.Put_Signal_Name (stderr, Sig);
            New_Line (stderr);
            Error ("several sources for unresolved signal");
            --  FIXME: display signal name.
         elsif Sig.S.Mode_Sig = Mode_Buffer and False then
            --  LRM 1.1.1.2  Ports
            --  A BUFFER port may have at most one source.

            --  FIXME: this is not true with VHDL-02.
            --  With VHDL-87/93, should also check that: any actual associated
            --  with a formal buffer port may have at most one source.
            Error ("buffer port which more than one source");
         end if;
      end if;
   end Check_New_Source;

   procedure Ghdl_Process_Add_Driver (Sign : Ghdl_Signal_Ptr)
   is
      type Size_T is mod 2**Standard'Address_Size;

      function Malloc (Size : Size_T) return Driver_Arr_Ptr;
      pragma Import (C, Malloc);

      function Realloc (Ptr : Driver_Arr_Ptr; Size : Size_T)
        return Driver_Arr_Ptr;
      pragma Import (C, Realloc);

      function Size (N : Ghdl_Index_Type) return Size_T is
      begin
         return Size_T (N * Driver_Fat_Array'Component_Size
                        / System.Storage_Unit);
      end Size;

      Trans : Transaction_Acc;
      Id : Process_Id;
   begin
      Id := Get_Current_Process_Id;
      if Sign.S.Nbr_Drivers = 0 then
         Check_New_Source (Sign);
         Sign.S.Drivers := Malloc (Size (1));
         Sign.S.Nbr_Drivers := 1;
      else
         -- Do not create a driver twice.
         for I in 0 .. Sign.S.Nbr_Drivers - 1 loop
            if Sign.S.Drivers (I).Proc = Id then
               return;
            end if;
         end loop;
         Check_New_Source (Sign);
         Sign.S.Nbr_Drivers := Sign.S.Nbr_Drivers + 1;
         Sign.S.Drivers := Realloc (Sign.S.Drivers, Size (Sign.S.Nbr_Drivers));
      end if;
      Trans := new Transaction'(Kind => Trans_Value,
                                Time => 0,
                                Next => null,
                                Val => Sign.Value);
      Sign.S.Drivers (Sign.S.Nbr_Drivers - 1) :=
        (First_Trans => Trans,
         Last_Trans => Trans,
         Proc => Id);
   end Ghdl_Process_Add_Driver;

   procedure Append_Port (Targ : Ghdl_Signal_Ptr; Src : Ghdl_Signal_Ptr)
   is
      type Size_T is new Integer;

      function Malloc (Size : Size_T) return Signal_Arr_Ptr;
      pragma Import (C, Malloc);

      function Realloc (Ptr : Signal_Arr_Ptr; Size : Size_T)
        return Signal_Arr_Ptr;
      pragma Import (C, Realloc);

      function Size (N : Ghdl_Index_Type) return Size_T is
      begin
         return Size_T (N * Ghdl_Signal_Ptr'Size / System.Storage_Unit);
      end Size;
   begin
      if Targ.Nbr_Ports = 0 then
         Targ.Ports := Malloc (Size (1));
         Targ.Nbr_Ports := 1;
      else
         Targ.Nbr_Ports := Targ.Nbr_Ports + 1;
         Targ.Ports := Realloc (Targ.Ports, Size (Targ.Nbr_Ports));
      end if;
      Targ.Ports (Targ.Nbr_Ports - 1) := Src;
   end Append_Port;

   --  Add SRC to port list of TARG, but only if not already in this list.
   procedure Add_Port (Targ : Ghdl_Signal_Ptr; Src : Ghdl_Signal_Ptr)
   is
   begin
      for I in 1 .. Targ.Nbr_Ports loop
         if Targ.Ports (I - 1) = Src then
            return;
         end if;
      end loop;
      Append_Port (Targ, Src);
   end Add_Port;

   procedure Ghdl_Signal_Add_Source (Targ : Ghdl_Signal_Ptr;
                                     Src : Ghdl_Signal_Ptr)
   is
   begin
      Check_New_Source (Targ);
      Append_Port (Targ, Src);
   end Ghdl_Signal_Add_Source;

   procedure Ghdl_Signal_Set_Disconnect (Sign : Ghdl_Signal_Ptr;
                                         Time : Std_Time) is
   begin
      if Sign.S.Resolv = null then
         Internal_Error ("ghdl_signal_set_disconnect: not resolved");
      end if;
      if Sign.S.Resolv.Disconnect_Time /= Bad_Time then
         Error ("disconnection already specified for signal");
      end if;
      if Time < 0 then
         Error ("disconnection time is negative");
      end if;
      Sign.S.Resolv.Disconnect_Time := Time;
   end Ghdl_Signal_Set_Disconnect;

   procedure Free is new Ada.Unchecked_Deallocation
     (Object => Transaction, Name => Transaction_Acc);

   function Value_Equal (Left, Right : Value_Union; Mode : Mode_Type)
     return Boolean
   is
   begin
      case Mode is
         when Mode_B2 =>
            return Left.B2 = Right.B2;
         when Mode_E8 =>
            return Left.E8 = Right.E8;
         when Mode_E32 =>
            return Left.E32 = Right.E32;
         when Mode_I32 =>
            return Left.I32 = Right.I32;
         when Mode_I64 =>
            return Left.I64 = Right.I64;
         when Mode_F64 =>
            return Left.F64 = Right.F64;
      end case;
   end Value_Equal;

   function Find_Driver (Sig : Ghdl_Signal_Ptr) return Ghdl_Index_Type
   is
      Id : Process_Id;
   begin
      if Sig.S.Drivers = null then
         Error ("assignment to a signal without any driver");
      end if;
      Id := Get_Current_Process_Id;
      for I in 0 .. Sig.S.Nbr_Drivers - 1 loop
         if Sig.S.Drivers (I).Proc = Id then
            return I;
         end if;
      end loop;
      Error ("assignment to a signal without a driver for the process");
   end Find_Driver;

   function Get_Driver (Sig : Ghdl_Signal_Ptr) return Driver_Acc
   is
      Id : Process_Id;
   begin
      if Sig.S.Drivers = null then
         return null;
      end if;
      Id := Get_Current_Process_Id;
      for I in 0 .. Sig.S.Nbr_Drivers - 1 loop
         if Sig.S.Drivers (I).Proc = Id then
            return Sig.S.Drivers (I)'Access;
         end if;
      end loop;
      return null;
   end Get_Driver;

   --  Unused but well-known signal which always terminate ACTIVE_LIST.
   --  As a consequence, every element of ACTIVE_LIST has a link field set to
   --  a non-null value (this is of course not true for SIGNAL_END).  This may
   --  be used to quickly check if a signal is in the list.
   --  This signal is not in the signal table.
   Signal_End : Ghdl_Signal_Ptr;

   --  List of active signals.
   Active_List : aliased Ghdl_Signal_Ptr;

   --  List of signals which have projected waveforms in the future (beyond
   --  the next delta cycle).
   Future_List : aliased Ghdl_Signal_Ptr;

   procedure Ghdl_Signal_Start_Assign (Sign : Ghdl_Signal_Ptr;
                                       Reject : Std_Time;
                                       Trans : Transaction_Acc;
                                       After : Std_Time)
   is
      Assign_Time : Std_Time;
      Drv : constant Ghdl_Index_Type := Find_Driver (Sign);
      Drv_Ptr : constant Driver_Arr_Ptr := Sign.S.Drivers;
      Driver : Driver_Type renames Drv_Ptr (Drv);
   begin
      --  LRM93 8.4.1
      --  It is an error if the time expression in a waveform element
      --  evaluates to a negative value.
      if After < 0 then
         Error ("negative time expression in signal assignment");
      end if;

      if After = 0 then
         --  Put SIGN on the active list if the transaction is scheduled
         --   for the next delta cycle.
         if Sign.Link = null then
            Sign.Link := Grt.Threads.Atomic_Insert (Active_List'access, Sign);
         end if;
      else
         --  AFTER > 0.
         --  Put SIGN on the future list.
         if Sign.Flink = null then
            Sign.Flink := Grt.Threads.Atomic_Insert (Future_List'access, Sign);
         end if;
      end if;

      Assign_Time := Current_Time + After;
      if Assign_Time < 0 then
         --  Beyond the future
         declare
            Ntrans : Transaction_Acc;
         begin
            Ntrans := Trans;
            Free (Ntrans);
            return;
         end;
      end if;

      --  LRM93 8.4.1
      --  1. All old transactions that are projected to occur at or after the
      --     time at which the earliest new transaction is projected to occur
      --     are deleted from the projected output waveform.
      if Driver.Last_Trans.Time >= Assign_Time then
         declare
            --  LAST is the last transaction to keep.
            Last : Transaction_Acc;
            Next : Transaction_Acc;
         begin
            Last := Driver.First_Trans;
            --  Find the first transaction to be deleted.
            Next := Last.Next;
            while Next /= null and then Next.Time < Assign_Time loop
               Last := Next;
               Next := Next.Next;
            end loop;
            --  Delete old transactions.
            if Next /= null then
               --  Set the last transaction of the driver.
               Driver.Last_Trans := Last;
               --  Cut the chain.  This is not strickly necessary, since
               --  it will be overriden below, by appending TRANS to the
               --  driver.
               Last.Next := null;
               --  Free removed transactions.
               loop
                  Last := Next.Next;
                  Free (Next);
                  exit when Last = null;
                  Next := Last;
               end loop;
            end if;
         end;
      end if;

      --  2.  The new transaction are then appended to the projected output
      --      waveform in the order of their projected occurence.
      Trans.Time := Assign_Time;
      Driver.Last_Trans.Next := Trans;
      Driver.Last_Trans := Trans;

      --  If the initial delay is inertial delay according to the definitions
      --  of section 8.4, the projected output waveform is further modified
      --  as follows:
      --  1.  All of the new transactions are marked.
      --  2.  An old transaction is marked if the time at which it is projected
      --      to occur is less than the time at which the first new transaction
      --      is projected to occur minus the pulse rejection limit.
      --  3.  For each remaining unmarked, old transaction, the old transaction
      --      is marked if it immediatly precedes a marked transaction and its
      --      value component is the same as that of the marked transaction;
      --  4.  The transaction that determines the current value of the driver
      --      is marked.
      --  5.  All unmarked transactions (all of which are old transactions) are
      --      deleted from the projected output waveform.
      --
      --  GHDL: only transactions that are projected to occur at [T-R, T[
      --  can be deleted (R is the reject time, T is now + after time).
      if Reject > 0 then
         --  LRM93 8.4
         --  It is an error if the pulse rejection limit for any inertially
         --  delayed signal assignment statement is [...] or greater than the
         --  time expression associated with the first waveform element.
         if Reject > After then
            Error ("pulse rejection greater than first waveform delay");
         end if;

         declare
            Prev : Transaction_Acc;
            Next : Transaction_Acc;
         begin
            --  Find the first transaction after the project time less the
            --  rejection time.
            --  PREV will be the last old transaction which is projected to
            --  occur before T - R.
            Prev := Driver.First_Trans;
            loop
               Next := Prev.Next;
               exit when Next.Time >= Assign_Time - Reject;
               Prev := Next;
            end loop;

            --  Scan every transaction until TRANS.  If a transaction value is
            --  different from the TRANS value, then delete all previous
            --  transactions (from T - R to the currently scanned transaction),
            --  since they are not marked.
            while Next /= Trans loop
               if Next.Kind /= Trans.Kind
                 or else
                 (Trans.Kind = Trans_Value
                  and then not Value_Equal (Next.Val, Trans.Val, Sign.Mode))
               then
                  --  NEXT is different from TRANS.
                  --  Delete ]PREV;NEXT].
                  declare
                     D, N : Transaction_Acc;
                  begin
                     D := Prev.Next;
                     Next := Next.Next;
                     Prev.Next := Next;
                     loop
                        N := D.Next;
                        Free (D);
                        exit when N = Next;
                        D := N;
                     end loop;
                  end;
               else
                  Next := Next.Next;
               end if;
            end loop;
         end;
      elsif Reject /= 0 then
         --  LRM93 8.4
         --  It is an error if the pulse rejection limit for any inertially
         --  delayed signal assignment statement is either negative or [...].
         Error ("pulse rejection is negative");
      end if;

      --  Do some checks.
      if Driver.Last_Trans.Next /= null then
         Error ("ghdl_signal_start_assign internal_error");
      end if;
   end Ghdl_Signal_Start_Assign;

   procedure Ghdl_Signal_Next_Assign (Sign : Ghdl_Signal_Ptr;
                                      Val : Value_Union;
                                      After : Std_Time)
   is
      Drv_Ptr : constant Driver_Arr_Ptr := Sign.S.Drivers;
      Driver : Driver_Type renames Drv_Ptr (Find_Driver (Sign));

      Trans : Transaction_Acc;
   begin
      if After > 0 and then Sign.Flink = null then
         --  Put SIGN on the future list.
         Sign.Flink := Future_List;
         Future_List := Sign;
      end if;

      Trans := new Transaction'(Kind => Trans_Value,
                                Time => Current_Time + After,
                                Next => null,
                                Val => Val);
      if Trans.Time <= Driver.Last_Trans.Time then
         Error ("transactions not in ascending order");
      end if;
      Driver.Last_Trans.Next := Trans;
      Driver.Last_Trans := Trans;
   end Ghdl_Signal_Next_Assign;

   procedure Ghdl_Signal_Simple_Assign_Error (Sign : Ghdl_Signal_Ptr)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'(Kind => Trans_Error,
                                Time => 0,
                                Next => null);
      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_Error;

   procedure Ghdl_Signal_Start_Assign_Error (Sign : Ghdl_Signal_Ptr;
                                             Rej : Std_Time;
                                             After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'(Kind => Trans_Error,
                                Time => 0,
                                Next => null);
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_Error;

   procedure Ghdl_Signal_Start_Assign_Null (Sign : Ghdl_Signal_Ptr;
                                            Rej : Std_Time;
                                            After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      if not Is_Signal_Guarded (Sign) then
         Error ("null transaction for a non-guarded target");
      end if;
      Trans := new Transaction'(Kind => Trans_Null,
                                Time => 0,
                                Next => null);
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_Null;

   procedure Ghdl_Signal_Disconnect (Sign : Ghdl_Signal_Ptr)
   is
      Trans : Transaction_Acc;
      Time : Std_Time;
   begin
      if not Is_Signal_Guarded (Sign) then
         Error ("null transaction for a non-guarded target");
      end if;
      Trans := new Transaction'(Kind => Trans_Null,
                                Time => 0,
                                Next => null);
      Time := Sign.S.Resolv.Disconnect_Time;
      Ghdl_Signal_Start_Assign (Sign, Time, Trans, Time);
   end Ghdl_Signal_Disconnect;

   procedure Ghdl_Signal_Associate (Sig : Ghdl_Signal_Ptr; Val : Value_Union)
   is
   begin
      Sig.Value := Val;
      Sig.Driving_Value := Val;
   end Ghdl_Signal_Associate;

   function Ghdl_Create_Signal_B2
     (Init_Val : Ghdl_B2;
      Resolv_Func : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
   begin
      return Create_Signal
        (Mode_B2, Value_Union'(Mode => Mode_B2, B2 => Init_Val),
         Get_Current_Mode_Signal,
         Resolv_Func, Resolv_Inst);
   end Ghdl_Create_Signal_B2;

   procedure Ghdl_Signal_Init_B2 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_B2) is
   begin
      Ghdl_Signal_Init (Sig, Value_Union'(Mode => Mode_B2, B2 => Init_Val));
   end Ghdl_Signal_Init_B2;

   procedure Ghdl_Signal_Associate_B2 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_B2) is
   begin
      Ghdl_Signal_Associate (Sig, Value_Union'(Mode => Mode_B2, B2 => Val));
   end Ghdl_Signal_Associate_B2;

   procedure Ghdl_Signal_Simple_Assign_B2 (Sign : Ghdl_Signal_Ptr;
                                           Val : Ghdl_B2)
   is
      Trans : Transaction_Acc;
   begin
      if not Sign.Flags.Has_Active
        and then Sign.Net = Net_One_Driver
        and then Val = Sign.Value.B2
        and then Sign.S.Drivers (0).First_Trans.Next = null
      then
         return;
      end if;

      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_B2, B2 => Val));

      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_B2;

   procedure Ghdl_Signal_Start_Assign_B2 (Sign : Ghdl_Signal_Ptr;
                                          Rej : Std_Time;
                                          Val : Ghdl_B2;
                                          After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_B2, B2 => Val));
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_B2;

   procedure Ghdl_Signal_Next_Assign_B2 (Sign : Ghdl_Signal_Ptr;
                                         Val : Ghdl_B2;
                                         After : Std_Time)
   is
   begin
      Ghdl_Signal_Next_Assign
        (Sign, Value_Union'(Mode => Mode_B2, B2 => Val), After);
   end Ghdl_Signal_Next_Assign_B2;

   function Ghdl_Create_Signal_E8
     (Init_Val : Ghdl_E8;
      Resolv_Func : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
   begin
      return Create_Signal
        (Mode_E8, Value_Union'(Mode => Mode_E8, E8 => Init_Val),
         Get_Current_Mode_Signal,
         Resolv_Func, Resolv_Inst);
   end Ghdl_Create_Signal_E8;

   procedure Ghdl_Signal_Init_E8 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_E8) is
   begin
      Ghdl_Signal_Init (Sig, Value_Union'(Mode => Mode_E8, E8 => Init_Val));
   end Ghdl_Signal_Init_E8;

   procedure Ghdl_Signal_Associate_E8 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_E8) is
   begin
      Ghdl_Signal_Associate (Sig, Value_Union'(Mode => Mode_E8, E8 => Val));
   end Ghdl_Signal_Associate_E8;

   procedure Ghdl_Signal_Simple_Assign_E8 (Sign : Ghdl_Signal_Ptr;
                                           Val : Ghdl_E8)
   is
      Trans : Transaction_Acc;
   begin
      if not Sign.Flags.Has_Active
        and then Sign.Net = Net_One_Driver
        and then Val = Sign.Value.E8
        and then Sign.S.Drivers (0).First_Trans.Next = null
      then
         return;
      end if;

      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_E8, E8 => Val));

      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_E8;

   procedure Ghdl_Signal_Start_Assign_E8 (Sign : Ghdl_Signal_Ptr;
                                          Rej : Std_Time;
                                          Val : Ghdl_E8;
                                          After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_E8, E8 => Val));
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_E8;

   procedure Ghdl_Signal_Next_Assign_E8 (Sign : Ghdl_Signal_Ptr;
                                         Val : Ghdl_E8;
                                         After : Std_Time)
   is
   begin
      Ghdl_Signal_Next_Assign
        (Sign, Value_Union'(Mode => Mode_E8, E8 => Val), After);
   end Ghdl_Signal_Next_Assign_E8;

   function Ghdl_Create_Signal_I32
     (Init_Val : Ghdl_I32;
      Resolv_Func : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
   begin
      return Create_Signal
        (Mode_I32, Value_Union'(Mode => Mode_I32, I32 => Init_Val),
         Get_Current_Mode_Signal,
         Resolv_Func, Resolv_Inst);
   end Ghdl_Create_Signal_I32;

   procedure Ghdl_Signal_Init_I32 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_I32)
   is
   begin
      Ghdl_Signal_Init (Sig, Value_Union'(Mode => Mode_I32, I32 => Init_Val));
   end Ghdl_Signal_Init_I32;

   procedure Ghdl_Signal_Associate_I32 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_I32)
   is
   begin
      Ghdl_Signal_Associate (Sig, Value_Union'(Mode => Mode_I32, I32 => Val));
   end Ghdl_Signal_Associate_I32;

   procedure Ghdl_Signal_Simple_Assign_I32 (Sign : Ghdl_Signal_Ptr;
                                            Val : Ghdl_I32)
   is
      Trans : Transaction_Acc;
   begin
      if not Sign.Flags.Has_Active
        and then Sign.Net = Net_One_Driver
        and then Val = Sign.Value.I32
        and then Sign.S.Drivers (0).First_Trans.Next = null
      then
         return;
      end if;

      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_I32, I32 => Val));

      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_I32;

   procedure Ghdl_Signal_Start_Assign_I32 (Sign : Ghdl_Signal_Ptr;
                                           Rej : Std_Time;
                                           Val : Ghdl_I32;
                                           After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_I32, I32 => Val));
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_I32;

   procedure Ghdl_Signal_Next_Assign_I32 (Sign : Ghdl_Signal_Ptr;
                                          Val : Ghdl_I32;
                                          After : Std_Time)
   is
   begin
      Ghdl_Signal_Next_Assign
        (Sign, Value_Union'(Mode => Mode_I32, I32 => Val), After);
   end Ghdl_Signal_Next_Assign_I32;

   function Ghdl_Create_Signal_I64
     (Init_Val : Ghdl_I64;
      Resolv_Func : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
   begin
      return Create_Signal
        (Mode_I64, Value_Union'(Mode => Mode_I64, I64 => Init_Val),
         Get_Current_Mode_Signal,
         Resolv_Func, Resolv_Inst);
   end Ghdl_Create_Signal_I64;

   procedure Ghdl_Signal_Init_I64 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_I64)
   is
   begin
      Ghdl_Signal_Init (Sig, Value_Union'(Mode => Mode_I64, I64 => Init_Val));
   end Ghdl_Signal_Init_I64;

   procedure Ghdl_Signal_Associate_I64 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_I64)
   is
   begin
      Ghdl_Signal_Associate (Sig, Value_Union'(Mode => Mode_I64, I64 => Val));
   end Ghdl_Signal_Associate_I64;

   procedure Ghdl_Signal_Simple_Assign_I64 (Sign : Ghdl_Signal_Ptr;
                                            Val : Ghdl_I64)
   is
      Trans : Transaction_Acc;
   begin
      if not Sign.Flags.Has_Active
        and then Sign.Net = Net_One_Driver
        and then Val = Sign.Value.I64
        and then Sign.S.Drivers (0).First_Trans.Next = null
      then
         return;
      end if;

      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_I64, I64 => Val));

      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_I64;

   procedure Ghdl_Signal_Start_Assign_I64 (Sign : Ghdl_Signal_Ptr;
                                           Rej : Std_Time;
                                           Val : Ghdl_I64;
                                           After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_I64, I64 => Val));
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_I64;

   procedure Ghdl_Signal_Next_Assign_I64 (Sign : Ghdl_Signal_Ptr;
                                          Val : Ghdl_I64;
                                          After : Std_Time)
   is
   begin
      Ghdl_Signal_Next_Assign
        (Sign, Value_Union'(Mode => Mode_I64, I64 => Val), After);
   end Ghdl_Signal_Next_Assign_I64;

   function Ghdl_Create_Signal_F64
     (Init_Val : Ghdl_F64;
      Resolv_Func : System.Address;
      Resolv_Inst : System.Address)
     return Ghdl_Signal_Ptr
   is
   begin
      return Create_Signal
        (Mode_F64, Value_Union'(Mode => Mode_F64, F64 => Init_Val),
         Get_Current_Mode_Signal,
         Resolv_Func, Resolv_Inst);
   end Ghdl_Create_Signal_F64;

   procedure Ghdl_Signal_Init_F64 (Sig : Ghdl_Signal_Ptr; Init_Val : Ghdl_F64)
   is
   begin
      Ghdl_Signal_Init (Sig, Value_Union'(Mode => Mode_F64, F64 => Init_Val));
   end Ghdl_Signal_Init_F64;

   procedure Ghdl_Signal_Associate_F64 (Sig : Ghdl_Signal_Ptr; Val : Ghdl_F64)
   is
   begin
      Ghdl_Signal_Associate (Sig, Value_Union'(Mode => Mode_F64, F64 => Val));
   end Ghdl_Signal_Associate_F64;

   procedure Ghdl_Signal_Simple_Assign_F64 (Sign : Ghdl_Signal_Ptr;
                                            Val : Ghdl_F64)
   is
      Trans : Transaction_Acc;
   begin
      if not Sign.Flags.Has_Active
        and then Sign.Net = Net_One_Driver
        and then Val = Sign.Value.F64
        and then Sign.S.Drivers (0).First_Trans.Next = null
      then
         return;
      end if;

      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_F64, F64 => Val));

      Ghdl_Signal_Start_Assign (Sign, 0, Trans, 0);
   end Ghdl_Signal_Simple_Assign_F64;

   procedure Ghdl_Signal_Start_Assign_F64 (Sign : Ghdl_Signal_Ptr;
                                           Rej : Std_Time;
                                           Val : Ghdl_F64;
                                           After : Std_Time)
   is
      Trans : Transaction_Acc;
   begin
      Trans := new Transaction'
        (Kind => Trans_Value,
         Time => 0,
         Next => null,
         Val => Value_Union'(Mode => Mode_F64, F64 => Val));
      Ghdl_Signal_Start_Assign (Sign, Rej, Trans, After);
   end Ghdl_Signal_Start_Assign_F64;

   procedure Ghdl_Signal_Next_Assign_F64 (Sign : Ghdl_Signal_Ptr;
                                          Val : Ghdl_F64;
                                          After : Std_Time)
   is
   begin
      Ghdl_Signal_Next_Assign
        (Sign, Value_Union'(Mode => Mode_F64, F64 => Val), After);
   end Ghdl_Signal_Next_Assign_F64;

   procedure Ghdl_Signal_Internal_Checks
   is
      Sig : Ghdl_Signal_Ptr;
   begin
      for I in Sig_Table.First .. Sig_Table.Last loop
         Sig := Sig_Table.Table (I);

         --  Check drivers.
         for J in 1 .. Sig.S.Nbr_Drivers loop
            declare
               Trans : Transaction_Acc;
            begin
               Trans := Sig.S.Drivers (J - 1).First_Trans;
               while Trans.Next /= null loop
                  if Trans.Next.Time < Trans.Time then
                     Internal_Error ("ghdl_signal_internal_checks: "
                                     & "bad transaction order");
                  end if;
                  Trans := Trans.Next;
               end loop;
               if Trans /= Sig.S.Drivers (J - 1).Last_Trans then
                  Internal_Error ("ghdl_signal_internal_checks: "
                                  & "last transaction mismatch");
               end if;
            end;
         end loop;
      end loop;
   end Ghdl_Signal_Internal_Checks;

   procedure Ghdl_Signal_Effective_Value (Targ : Ghdl_Signal_Ptr;
                                          Src : Ghdl_Signal_Ptr)
   is
   begin
      if Targ.S.Effective /= null then
         Error ("internal error: already effective value");
      end if;
      Targ.S.Effective := Src;
   end Ghdl_Signal_Effective_Value;

   Bit_Signal_Rti : aliased Ghdl_Rtin_Object :=
     (Common => (Kind => Ghdl_Rtik_Signal,
                 Depth => 0,
                 Mode => Ghdl_Rti_Signal_Mode_None,
                 Max_Depth => 0),
      Name => null,
      Loc => (Rel => True, Off => 0),
      Obj_Type => null);

   Boolean_Signal_Rti : aliased Ghdl_Rtin_Object :=
     (Common => (Kind => Ghdl_Rtik_Signal,
                 Depth => 0,
                 Mode => Ghdl_Rti_Signal_Mode_None,
                 Max_Depth => 0),
      Name => null,
      Loc => (Rel => True, Off => 0),
      Obj_Type => null);

   function Ghdl_Create_Signal_Attribute
     (Mode : Mode_Signal_Type; Time : Std_Time)
     return Ghdl_Signal_Ptr
   is
      Res : Ghdl_Signal_Ptr;
--      Sig_Type : Ghdl_Desc_Ptr;
   begin
      case Mode is
         when Mode_Transaction =>
            Sig_Rti := To_Ghdl_Rtin_Object_Acc
              (To_Ghdl_Rti_Access (Bit_Signal_Rti'Address));
         when Mode_Quiet
           | Mode_Stable =>
            Sig_Rti := To_Ghdl_Rtin_Object_Acc
              (To_Ghdl_Rti_Access (Boolean_Signal_Rti'Address));
         when others =>
            Internal_Error ("ghdl_create_signal_attribute");
      end case;
--       Sig_Instance_Name := new Ghdl_Instance_Name_Type'
--         (Kind => Ghdl_Name_Signal,
--          Name => null,
--          Parent => null,
--          Brother => null,
--          Sig_Mode => Mode,
--          Sig_Kind => Kind_Signal_No,
--        Sig_Indexes => (First => Sig_Table.Last + 1, Last => Sig_Table.Last),
--          Sig_Type_Desc => Sig_Type);
      --  Note: bit and boolean are both mode_b2.
      Res := Create_Signal
        (Mode_B2, Value_Union'(Mode => Mode_B2, B2 => True),
         Mode, Null_Address, Null_Address);

      Last_Implicit_Signal := Res;

      if Mode /= Mode_Transaction then
         Res.S.Time := Time;
         Res.S.Attr_Trans := new Transaction'(Kind => Trans_Value,
                                              Time => 0,
                                              Next => null,
                                              Val => Res.Value);
      end if;

      if Time > 0 then
         Res.Flink := Future_List;
         Future_List := Res;
      end if;

      return Res;
   end Ghdl_Create_Signal_Attribute;

   function Ghdl_Create_Stable_Signal (Val : Std_Time) return Ghdl_Signal_Ptr
   is
   begin
      return Ghdl_Create_Signal_Attribute (Mode_Stable, Val);
   end Ghdl_Create_Stable_Signal;

   function Ghdl_Create_Quiet_Signal (Val : Std_Time) return Ghdl_Signal_Ptr
   is
   begin
      return Ghdl_Create_Signal_Attribute (Mode_Quiet, Val);
   end Ghdl_Create_Quiet_Signal;

   function Ghdl_Create_Transaction_Signal return Ghdl_Signal_Ptr
   is
   begin
      return Ghdl_Create_Signal_Attribute (Mode_Transaction, 0);
   end Ghdl_Create_Transaction_Signal;

   procedure Ghdl_Signal_Attribute_Register_Prefix (Sig : Ghdl_Signal_Ptr)
   is
   begin
      Add_Port (Last_Implicit_Signal, Sig);
   end Ghdl_Signal_Attribute_Register_Prefix;

   --Guard_String : constant String := "guard";
   --Guard_Name : constant Ghdl_Str_Len_Address_Type :=
   --  (Len => 5, Str => Guard_String'Address);
   --function To_Ghdl_Str_Len_Ptr is new Ada.Unchecked_Conversion
   --  (Source => System.Address, Target => Ghdl_Str_Len_Ptr);

   Guard_Rti : aliased constant Ghdl_Rtin_Object :=
     (Common => (Kind => Ghdl_Rtik_Signal,
                 Depth => 0,
                 Mode => Ghdl_Rti_Signal_Mode_None,
                 Max_Depth => 0),
      Name => null,
      Loc => (Rel => True, Off => 0),
      Obj_Type => Std_Standard_Boolean_RTI_Ptr);

   function Ghdl_Signal_Create_Guard (This : System.Address;
                                      Proc : Guard_Func_Acc)
     return Ghdl_Signal_Ptr
   is
      Res : Ghdl_Signal_Ptr;
   begin
      Sig_Rti := To_Ghdl_Rtin_Object_Acc
        (To_Ghdl_Rti_Access (Guard_Rti'Address));
      Res := Create_Signal
        (Mode_B2, Value_Union'(Mode => Mode_B2, B2 => Proc.all (This)),
         Mode_Guard, Null_Address, Null_Address);
      Res.S.Guard_Func := Proc;
      Res.S.Guard_Instance := This;
      Last_Implicit_Signal := Res;
      return Res;
   end Ghdl_Signal_Create_Guard;

   procedure Ghdl_Signal_Guard_Dependence (Sig : Ghdl_Signal_Ptr)
   is
   begin
      Add_Port (Last_Implicit_Signal, Sig);
   end Ghdl_Signal_Guard_Dependence;

   function Ghdl_Create_Delayed_Signal (Sig : Ghdl_Signal_Ptr; Val : Std_Time)
                                       return Ghdl_Signal_Ptr
   is
      Res : Ghdl_Signal_Ptr;
   begin
      Res := Create_Signal (Sig.Mode, Sig.Value,
                            Mode_Delayed, Null_Address, Null_Address);
      Res.S.Time := Val;
      if Val > 0 then
         Res.Flink := Future_List;
         Future_List := Res;
      end if;
      Res.S.Attr_Trans := new Transaction'(Kind => Trans_Value,
                                           Time => 0,
                                           Next => null,
                                           Val => Res.Value);
      Append_Port (Res, Sig);
      return Res;
   end Ghdl_Create_Delayed_Signal;

   function Signal_Ptr_To_Index (Ptr : Ghdl_Signal_Ptr) return Sig_Table_Index
   is
   begin
      --  Note: we may start from ptr.instance_name.sig_index, but
      --  instance_name is *not* set for conversion signals.
      for I in reverse Sig_Table.First .. Sig_Table.Last loop
         if Sig_Table.Table (I) = Ptr then
            return I;
         end if;
      end loop;
      return -1;
   end Signal_Ptr_To_Index;

   function Ghdl_Signal_Get_Nbr_Ports (Sig : Ghdl_Signal_Ptr)
                                      return Ghdl_Index_Type is
   begin
      return Sig.Nbr_Ports;
   end Ghdl_Signal_Get_Nbr_Ports;

   function Ghdl_Signal_Get_Nbr_Drivers (Sig : Ghdl_Signal_Ptr)
                                        return Ghdl_Index_Type is
   begin
      return Sig.S.Nbr_Drivers;
   end Ghdl_Signal_Get_Nbr_Drivers;

   function Ghdl_Signal_Read_Port
     (Sig : Ghdl_Signal_Ptr; Index : Ghdl_Index_Type)
     return Ghdl_Value_Ptr
   is
   begin
      if Index >= Sig.Nbr_Ports then
         Internal_Error ("ghdl_signal_read_port: bad index");
      end if;
      return To_Ghdl_Value_Ptr (Sig.Ports (Index).Driving_Value'Address);
   end Ghdl_Signal_Read_Port;

   function Ghdl_Signal_Read_Driver
     (Sig : Ghdl_Signal_Ptr; Index : Ghdl_Index_Type)
     return Ghdl_Value_Ptr
   is
      Trans : Transaction_Acc;
   begin
      if Index >= Sig.S.Nbr_Drivers then
         Internal_Error ("ghdl_signal_read_driver: bad index");
      end if;
      Trans := Sig.S.Drivers (Index).First_Trans;
      case Trans.Kind is
         when Trans_Value =>
            return To_Ghdl_Value_Ptr (Trans.Val'Address);
         when Trans_Null =>
            return null;
         when Trans_Error =>
            Error ("range check error on signal");
      end case;
   end Ghdl_Signal_Read_Driver;

   procedure Ghdl_Signal_Conversion (Func : System.Address;
                                     Instance : System.Address;
                                     Src : Ghdl_Signal_Ptr;
                                     Src_Len : Ghdl_Index_Type;
                                     Dst : Ghdl_Signal_Ptr;
                                     Dst_Len : Ghdl_Index_Type;
                                     Mode : Mode_Signal_Type)
   is
      Data : Sig_Conversion_Acc;
      Sig : Ghdl_Signal_Ptr;
   begin
      Data := new Sig_Conversion_Type'(Func => Func,
                                       Instance => Instance,
                                       Src => (-1, -1),
                                       Dest => (-1, -1));
      Data.Src.First := Signal_Ptr_To_Index (Src);
      Data.Src.Last := Data.Src.First + Sig_Table_Index (Src_Len) - 1;

      Data.Dest.First := Signal_Ptr_To_Index (Dst);
      Data.Dest.Last := Data.Dest.First + Sig_Table_Index (Dst_Len) - 1;

      --  Convert DEST to new mode.
      for I in Data.Dest.First .. Data.Dest.Last loop
         Sig := Sig_Table.Table (I);
         case Mode is
            when Mode_Conv_In =>
               Sig.S := (Mode_Sig => Mode_Conv_In,
                         Conv => Data);
            when Mode_Conv_Out =>
               Sig.S := (Mode_Sig => Mode_Conv_Out,
                         Conv => Data);
            when others =>
               Internal_Error ("ghdl_signal_conversion");
         end case;
      end loop;
   end Ghdl_Signal_Conversion;

   procedure Ghdl_Signal_In_Conversion (Func : System.Address;
                                        Instance : System.Address;
                                        Src : Ghdl_Signal_Ptr;
                                        Src_Len : Ghdl_Index_Type;
                                        Dst : Ghdl_Signal_Ptr;
                                        Dst_Len : Ghdl_Index_Type)
   is
   begin
      Ghdl_Signal_Conversion
        (Func, Instance, Src, Src_Len, Dst, Dst_Len, Mode_Conv_In);
   end Ghdl_Signal_In_Conversion;

   procedure Ghdl_Signal_Out_Conversion (Func : System.Address;
                                         Instance : System.Address;
                                         Src : Ghdl_Signal_Ptr;
                                         Src_Len : Ghdl_Index_Type;
                                         Dst : Ghdl_Signal_Ptr;
                                         Dst_Len : Ghdl_Index_Type)
   is
   begin
      Ghdl_Signal_Conversion
        (Func, Instance, Src, Src_Len, Dst, Dst_Len, Mode_Conv_Out);
   end Ghdl_Signal_Out_Conversion;

   function Ghdl_Signal_Driving (Sig : Ghdl_Signal_Ptr) return Ghdl_B2
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null then
         --  FIXME: disp signal and process.
         Error ("'driving error: no driver in process for signal");
      end if;
      if Drv.First_Trans.Kind /= Trans_Null then
         return True;
      else
         return False;
      end if;
   end Ghdl_Signal_Driving;

   function Ghdl_Signal_Driving_Value_B2 (Sig : Ghdl_Signal_Ptr) return Ghdl_B2
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null or else Drv.First_Trans.Kind /= Trans_Value then
         Error ("'driving_value: no active driver in process for signal");
      else
         return Drv.First_Trans.Val.B2;
      end if;
   end Ghdl_Signal_Driving_Value_B2;

   function Ghdl_Signal_Driving_Value_E8 (Sig : Ghdl_Signal_Ptr)
                                         return Ghdl_E8
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null or else Drv.First_Trans.Kind /= Trans_Value then
         Error ("'driving_value: no active driver in process for signal");
      else
         return Drv.First_Trans.Val.E8;
      end if;
   end Ghdl_Signal_Driving_Value_E8;

   function Ghdl_Signal_Driving_Value_I32 (Sig : Ghdl_Signal_Ptr)
                                          return Ghdl_I32
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null or else Drv.First_Trans.Kind /= Trans_Value then
         Error ("'driving_value: no active driver in process for signal");
      else
         return Drv.First_Trans.Val.I32;
      end if;
   end Ghdl_Signal_Driving_Value_I32;

   function Ghdl_Signal_Driving_Value_I64 (Sig : Ghdl_Signal_Ptr)
                                          return Ghdl_I64
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null or else Drv.First_Trans.Kind /= Trans_Value then
         Error ("'driving_value: no active driver in process for signal");
      else
         return Drv.First_Trans.Val.I64;
      end if;
   end Ghdl_Signal_Driving_Value_I64;

   function Ghdl_Signal_Driving_Value_F64 (Sig : Ghdl_Signal_Ptr)
                                          return Ghdl_F64
   is
      Drv : Driver_Acc;
   begin
      Drv := Get_Driver (Sig);
      if Drv = null or else Drv.First_Trans.Kind /= Trans_Value then
         Error ("'driving_value: no active driver in process for signal");
      else
         return Drv.First_Trans.Val.F64;
      end if;
   end Ghdl_Signal_Driving_Value_F64;

   procedure Flush_Active_List
   is
      Sig : Ghdl_Signal_Ptr;
      Next_Sig : Ghdl_Signal_Ptr;
   begin
      --  Free active_list.
      Sig := Active_List;
      loop
         Next_Sig := Sig.Link;
         exit when Next_Sig = null;
         Sig.Link := null;
         Sig := Next_Sig;
      end loop;
      Active_List := Sig;
   end Flush_Active_List;

   --  Add SIG in active_list.
   procedure Add_Active_List (Sig : Ghdl_Signal_Ptr);
   pragma Inline (Add_Active_List);

   procedure Add_Active_List (Sig : Ghdl_Signal_Ptr)
   is
   begin
      if Sig.Link = null then
         Sig.Link := Active_List;
         Active_List := Sig;
      end if;
   end Add_Active_List;

   function Find_Next_Time return Std_Time
   is
      Res : Std_Time;
      Sig : Ghdl_Signal_Ptr;

      procedure Check_Transaction (Trans : Transaction_Acc)
      is
      begin
         if Trans /= null then
            if Trans.Time = Res and Sig.Link = null then
               Sig.Link := Active_List;
               Active_List := Sig;
            elsif Trans.Time < Res then
               Flush_Active_List;

               --  Put sig on the list.
               Sig.Link := Active_List;
               Active_List := Sig;

               Res := Trans.Time;
            end if;
            if Res = Current_Time then
               --  Must have been in the active list.
               Internal_Error ("find_next_time(2)");
            end if;
         end if;
      end Check_Transaction;
   begin
      --  If there is signals in the active list, then next cycle is a delta
      --  cycle, so next time is current_time.
      if Active_List.Link /= null then
         return Current_Time;
      end if;

      Res := Std_Time'Last;

      Sig := Future_List;
      while Sig.Flink /= null loop
         case Sig.S.Mode_Sig is
            when Mode_Signal_User =>
               for J in 1 .. Sig.S.Nbr_Drivers loop
                  Check_Transaction (Sig.S.Drivers (J - 1).First_Trans.Next);
               end loop;
            when Mode_Delayed
              | Mode_Stable
              | Mode_Quiet =>
               Check_Transaction (Sig.S.Attr_Trans.Next);
            when others =>
               Internal_Error ("find_next_time(3)");
         end case;
         Sig := Sig.Flink;
      end loop;
      return Res;
   end Find_Next_Time;

--    function Get_Nbr_Non_Null_Source (Sig : Ghdl_Signal_Ptr)
--                                     return Natural
--    is
--       Length : Natural;
--    begin
--       Length := Sig.Nbr_Ports;
--       for I in 0 .. Sig.Nbr_Drivers - 1 loop
--          case Sig.Drivers (I).First_Trans.Kind is
--             when Trans_Value =>
--                Length := Length + 1;
--             when Trans_Null =>
--                null;
--             when Trans_Error =>
--                Error ("range check error");
--          end case;
--       end loop;
--       return Length;
--    end Get_Nbr_Non_Null_Source;

   Clear_List : Ghdl_Signal_Ptr := null;

   procedure Mark_Active (Sig : Ghdl_Signal_Ptr);
   pragma Inline (Mark_Active);

   procedure Mark_Active (Sig : Ghdl_Signal_Ptr)
   is
   begin
      if Sig.Active then
         Internal_Error ("mark_active");
      end if;
      Sig.Active := True;
      Sig.Last_Active := Current_Time;
      Sig.Alink := Clear_List;
      Clear_List := Sig;
   end Mark_Active;

   type Resolver_Acc is access procedure
     (Instance : System.Address;
      Val : System.Address;
      Bool_Vec : System.Address;
      Vec_Len : Ghdl_Index_Type;
      Nbr_Drv : Ghdl_Index_Type;
      Nbr_Ports : Ghdl_Index_Type);

   function To_Resolver_Acc is new Ada.Unchecked_Conversion
     (Source => System.Address, Target => Resolver_Acc);

   procedure Compute_Resolved_Signal (Resolv : Resolved_Signal_Acc)
   is
      Sig : Ghdl_Signal_Ptr := Sig_Table.Table (Resolv.Sig_Range.First);
      Length : Ghdl_Index_Type;
      type Bool_Array_Type is array (1 .. Sig.S.Nbr_Drivers) of Boolean;
      Vec : Bool_Array_Type;
   begin
      --  Compute number of non-null drivers.
      Length := 0;
      for I in 1 .. Sig.S.Nbr_Drivers loop
         case Sig.S.Drivers (I - 1).First_Trans.Kind is
            when Trans_Value =>
               Length := Length + 1;
               Vec (I) := True;
            when Trans_Null =>
               Vec (I) := False;
            when Trans_Error =>
               Error ("range check error");
         end case;
      end loop;

      --  Check driving condition on all signals.
      for J in Resolv.Sig_Range.First + 1.. Resolv.Sig_Range.Last loop
         for I in 1 .. Sig.S.Nbr_Drivers loop
            if (Sig_Table.Table (J).S.Drivers (I - 1).First_Trans.Kind
                /= Trans_Null)
              xor Vec (I)
            then
               Error ("null-transaction required");
            end if;
         end loop;
      end loop;

      --  if no driving sources and register, exit.
      if Length = 0 and then Sig.Nbr_Ports = 0
        and then ((Sig.Rti.Common.Mode and Ghdl_Rti_Signal_Kind_Mask)
                  = Ghdl_Rti_Signal_Kind_Register)
      then
         return;
      end if;

      --  Call the procedure.
      To_Resolver_Acc (Resolv.Resolv_Proc).all
        (Resolv.Resolv_Inst,
         Resolv.Resolv_Ptr,
         Vec'Address,
         Length,
         Sig.S.Nbr_Drivers,
         Sig.Nbr_Ports);
   end Compute_Resolved_Signal;

   type Conversion_Func_Acc is access procedure (Instance : System.Address);
   function To_Conversion_Func_Acc is new Ada.Unchecked_Conversion
     (Source => System.Address, Target => Conversion_Func_Acc);

   procedure Call_Conversion_Function (Conv : Sig_Conversion_Acc)
   is
      F : Conversion_Func_Acc;
   begin
      F := To_Conversion_Func_Acc (Conv.Func);
      F.all (Conv.Instance);
   end Call_Conversion_Function;

   procedure Resume_Process_If_Event
     (Sig : Ghdl_Signal_Ptr; Proc : Process_Id)
   is
      El : Action_List_Acc;
   begin
      El := new Action_List'(Kind => Action_Process,
                             Proc => Proc,
                             Next => Sig.Event_List);
      Sig.Event_List := El;
   end Resume_Process_If_Event;

   --  Order of signals:
   --  To be computed: driving value or/and effective value
   --  To be considered: ports, signals, implicit signals, resolution,
   --                    conversion
   --

   procedure Add_Propagation (P : Propagation_Type) is
   begin
      Propagation.Increment_Last;
      Propagation.Table (Propagation.Last) := P;
   end Add_Propagation;

   --  Put SIG in PROPAGATION table until ORDER level.
   procedure Order_Signal (Sig : Ghdl_Signal_Ptr; Order : Propag_Order_Flag);

   --  Return TRUE is the effective value of SIG is the driving value of SIG.
   function Is_Eff_Drv (Sig : Ghdl_Signal_Ptr) return Boolean
   is
   begin
      case Sig.S.Mode_Sig is
         when Mode_Signal
           | Mode_Buffer =>
            return True;
         when Mode_Linkage
           | Mode_Out =>
            --  No effective value.
            return False;
         when Mode_Inout
           | Mode_In =>
            if Sig.S.Effective = null then
               if Sig.S.Nbr_Drivers > 0 or Sig.Nbr_Ports > 0 then
                  --  Only for inout.
                  return True;
               else
                  return False;
               end if;
            else
               return False;
            end if;
         when Mode_Conv_In
           | Mode_Conv_Out =>
            return False;
         when Mode_Stable
           | Mode_Guard
           | Mode_Quiet
           | Mode_Transaction
           | Mode_Delayed =>
            return True;
         when Mode_End =>
            return False;
      end case;
   end Is_Eff_Drv;

   procedure Order_Signal_List (Sig : Ghdl_Signal_Ptr;
                                Order : Propag_Order_Flag)
   is
   begin
      for I in 1 .. Sig.Nbr_Ports loop
         Order_Signal (Sig.Ports (I - 1), Order);
      end loop;
   end Order_Signal_List;

   --  Put SIG in PROPAGATION table until ORDER level.
   procedure Order_Signal (Sig : Ghdl_Signal_Ptr; Order : Propag_Order_Flag)
   is
   begin
      if Sig = null then
         return;
      end if;

      --  Catch infinite loops, which must never happen.
      --  Also exit if the signal is already fully ordered.
      case Sig.Flags.Propag is
         when Propag_None =>
            null;
         when Propag_Being_Driving =>
            Internal_Error ("order_signal: being driving");
         when Propag_Being_Effective =>
            Internal_Error ("order_signal: being effective");
         when Propag_Driving =>
            null;
         when Propag_Done =>
            --  If sig was already handled, nothing to do!
            return;
      end case;

      --  First, the driving value.
      if Sig.Flags.Propag = Propag_None then
         case Sig.S.Mode_Sig is
            when Mode_Signal_User =>
               if Sig.S.Nbr_Drivers = 0 and Sig.Nbr_Ports = 0 then
                  --  No source.
                  Sig.Flags.Propag := Propag_Driving;
               elsif Sig.S.Resolv = null then
                  --  Not resolved (so at most one source).
                  if Sig.S.Nbr_Drivers = 1 then
                     --  Not resolved, 1 source : a driver.
                     if Is_Eff_Drv (Sig) then
                        Add_Propagation ((Kind => Eff_One_Driver, Sig => Sig));
                        Sig.Flags.Propag := Propag_Done;
                     else
                        Add_Propagation ((Kind => Drv_One_Driver, Sig => Sig));
                        Sig.Flags.Propag := Propag_Driving;
                     end if;
                  else
                     Sig.Flags.Propag := Propag_Being_Driving;
                     --  not resolved, 1 source : Source is a port.
                     Order_Signal (Sig.Ports (0), Propag_Driving);
                     if Is_Eff_Drv (Sig) then
                        Add_Propagation ((Kind => Eff_One_Port, Sig => Sig));
                        Sig.Flags.Propag := Propag_Done;
                     else
                        Add_Propagation ((Kind => Drv_One_Port, Sig => Sig));
                        Sig.Flags.Propag := Propag_Driving;
                     end if;
                  end if;
               else
                  --  Resolved signal.
                  declare
                     Resolv : Resolved_Signal_Acc;
                     S : Ghdl_Signal_Ptr;
                  begin
                     --  Compute driving value of brothers.
                     Resolv := Sig.S.Resolv;
                     for I in Resolv.Sig_Range.First .. Resolv.Sig_Range.Last
                     loop
                        S := Sig_Table.Table (I);
                        if S.Flags.Propag /= Propag_None then
                           Internal_Error ("order_signal(1)");
                        end if;
                        S.Flags.Propag := Propag_Being_Driving;
                     end loop;
                     for I in Resolv.Sig_Range.First .. Resolv.Sig_Range.Last
                     loop
                        S := Sig_Table.Table (I);
                        --  Compute driving value of the sources.
                        for J in 1 .. S.Nbr_Ports loop
                           Order_Signal (S.Ports (J - 1), Propag_Driving);
                        end loop;
                     end loop;
                     for I in Resolv.Sig_Range.First .. Resolv.Sig_Range.Last
                     loop
                        S := Sig_Table.Table (I);
                        S.Flags.Propag := Propag_Driving;
                     end loop;

                     if Is_Eff_Drv (Sig) then
                        if Resolv.Sig_Range.First = Resolv.Sig_Range.Last then
                           Add_Propagation ((Kind => Eff_One_Resolved,
                                             Sig => Sig));
                        else
                           Add_Propagation ((Kind => Eff_Multiple,
                                             Resolv => Resolv));
                        end if;
                     else
                        if Resolv.Sig_Range.First = Resolv.Sig_Range.Last then
                           Add_Propagation ((Kind => Drv_One_Resolved,
                                             Sig => Sig));
                        else
                           Add_Propagation ((Kind => Drv_Multiple,
                                             Resolv => Resolv));
                        end if;
                     end if;
                  end;
               end if;
            when Mode_Signal_Implicit =>
               Sig.Flags.Propag := Propag_Being_Driving;
               Order_Signal_List (Sig, Propag_Done);
               Sig.Flags.Propag := Propag_Done;
               case Mode_Signal_Implicit (Sig.S.Mode_Sig) is
                  when Mode_Guard =>
                     Add_Propagation ((Kind => Imp_Guard, Sig => Sig));
                  when Mode_Stable =>
                     Add_Propagation ((Kind => Imp_Stable, Sig => Sig));
                  when Mode_Quiet =>
                     Add_Propagation ((Kind => Imp_Quiet, Sig => Sig));
                  when Mode_Transaction =>
                     Add_Propagation ((Kind => Imp_Transaction, Sig => Sig));
                  when Mode_Delayed =>
                     Add_Propagation ((Kind => Imp_Delayed, Sig => Sig));
               end case;
               return;
            when Mode_Conv_In =>
               --  In conversion signals have no driving value
               null;
            when Mode_Conv_Out =>
               declare
                  Conv : Sig_Conversion_Acc;
               begin
                  Conv := Sig.S.Conv;
                  for I in Conv.Dest.First .. Conv.Dest.Last loop
                     Sig_Table.Table (I).Flags.Propag := Propag_Being_Driving;
                  end loop;
                  for I in Conv.Src.First .. Conv.Src.Last loop
                     Order_Signal (Sig_Table.Table (I), Propag_Driving);
                  end loop;
                  Add_Propagation ((Kind => Out_Conversion, Conv => Conv));
                  for I in Conv.Dest.First .. Conv.Dest.Last loop
                     Sig_Table.Table (I).Flags.Propag := Propag_Done;
                  end loop;
               end;
            when Mode_End =>
               Internal_Error ("order_signal: mode_end");
         end case;
      end if;

      -- Effective value.
      if Order = Propag_Driving then
         --  Will be done later.
         return;
      end if;

      case Sig.S.Mode_Sig is
         when Mode_Signal
           | Mode_Buffer =>
            --  Effective value is driving value.
            Sig.Flags.Propag := Propag_Done;
         when Mode_Linkage
           | Mode_Out =>
            --  No effective value.
            Sig.Flags.Propag := Propag_Done;
         when Mode_Inout
           | Mode_In =>
            if Sig.S.Effective = null then
               --  Effective value is driving value or initial value.
               null;
            else
               Sig.Flags.Propag := Propag_Being_Effective;
               Order_Signal (Sig.S.Effective, Propag_Done);
               Add_Propagation ((Kind => Eff_Actual, Sig => Sig));
               Sig.Flags.Propag := Propag_Done;
            end if;
         when Mode_Stable
           | Mode_Guard
           | Mode_Quiet
           | Mode_Transaction
           | Mode_Delayed =>
            --  Sig.Propag is already set to PROPAG_DONE.
            null;
         when Mode_Conv_In =>
            declare
               Conv : Sig_Conversion_Acc;
            begin
               Conv := Sig.S.Conv;
               for I in Conv.Dest.First .. Conv.Dest.Last loop
                  Sig_Table.Table (I).Flags.Propag := Propag_Being_Effective;
               end loop;
               for I in Conv.Src.First .. Conv.Src.Last loop
                  Order_Signal (Sig_Table.Table (I), Propag_Done);
               end loop;
               Add_Propagation ((Kind => In_Conversion, Conv => Conv));
               for I in Conv.Dest.First .. Conv.Dest.Last loop
                  Sig_Table.Table (I).Flags.Propag := Propag_Done;
               end loop;
            end;
         when Mode_Conv_Out =>
            --  No effective value.
            null;
         when Mode_End =>
            Internal_Error ("order_signal: mode_end");
      end case;
   end Order_Signal;

   procedure Set_Net (Sig : Ghdl_Signal_Ptr;
                      Net : Signal_Net_Type;
                      Link : Ghdl_Signal_Ptr)
   is
      use Astdio;
      use Stdio;
   begin
      if Sig = null then
         return;
      end if;

      if Boolean'(False) then
         Put ("set_net ");
         Put_I32 (stdout, Ghdl_I32 (Net));
         Put (" on ");
         Put (stdout, Sig.all'Address);
         Put ("  ");
         Disp_Signals.Disp_Mode_Signal (Sig.S.Mode_Sig);
         New_Line;
      end if;

      if Sig.Net /= No_Signal_Net then
         if Sig.Net /= Net then
            --  Renumber.
            if Boolean'(False) then
               Put ("set_net renumber ");
               Put_I32 (stdout, Ghdl_I32 (Net));
               Put (" on ");
               Put (stdout, Sig.all'Address);
               New_Line;
            end if;

            declare
               S : Ghdl_Signal_Ptr;
               Old : Signal_Net_Type := Sig.Net;
            begin
               --  Merge the old net into NET.
               S := Sig;
               loop
                  S.Net := Net;
                  S := S.Link;
                  exit when S = Sig;
               end loop;

               --  Add to the ring.
               S := Sig.Link;
               Sig.Link := Link.Link;
               Link.Link := S;

               --  Check.
               for I in Sig_Table.First .. Sig_Table.Last loop
                  if Sig_Table.Table (I).Net = Old then
--                      Disp_Signals.Disp_Signals_Table;
--                      Disp_Signals.Disp_Signals_Map;

                     Internal_Error ("set_net: link corrupted");
                  end if;
               end loop;
            end;
         end if;
         return;
      end if;

      Sig.Net := Net;

      --  Add SIG in the LINK ring.
      --  Note: this works even if LINK is not a ring (ie, LINK.link = null).
      if Link.Link = null and then Sig /= Link then
         Internal_Error ("set_net: bad link");
      end if;
      Sig.Link := Link.Link;
      Link.Link := Sig;

      --  Dependences.
      case Sig.S.Mode_Sig is
         when Mode_Signal_User =>
            for I in 1 .. Sig.Nbr_Ports loop
               Set_Net (Sig.Ports (I - 1), Net, Link);
            end loop;
            Set_Net (Sig.S.Effective, Net, Link);
            if Sig.S.Resolv /= null then
               for I in Sig.S.Resolv.Sig_Range.First
                 .. Sig.S.Resolv.Sig_Range.Last
               loop
                  Set_Net (Sig_Table.Table (I), Net, Link);
               end loop;
            end if;
         when Mode_Signal_Implicit =>
            for I in 1 .. Sig.Nbr_Ports loop
               Set_Net (Sig.Ports (I - 1), Net, Link);
            end loop;
         when Mode_Conv_In
           | Mode_Conv_Out =>
            declare
               S : Ghdl_Signal_Ptr;
               Conv : Sig_Conversion_Acc;
            begin
               Conv := Sig.S.Conv;
               S := Sig_Table.Table (Conv.Src.First);
               if Sig = S or else S.Net /= Net then
                  for J in Conv.Src.First .. Conv.Src.Last loop
                     Set_Net (Sig_Table.Table (J), Net, Link);
                  end loop;
                  for J in Conv.Dest.First .. Conv.Dest.Last loop
                     Set_Net (Sig_Table.Table (J), Net, Link);
                  end loop;
               end if;
            end;
         when Mode_End =>
            Internal_Error ("set_net");
      end case;
   end Set_Net;

   function Get_Propagation_Net (P : Signal_Net_Type) return Signal_Net_Type
   is
   begin
      case Propagation.Table (P).Kind is
         when Drv_Multiple
           | Eff_Multiple =>
            return Sig_Table.Table
              (Propagation.Table (P).Resolv.Sig_Range.First).Net;
         when In_Conversion
           | Out_Conversion =>
            return Sig_Table.Table
              (Propagation.Table (P).Conv.Src.First).Net;
         when others =>
            return Propagation.Table (P).Sig.Net;
      end case;
   end Get_Propagation_Net;

   Last_Signal_Net : Signal_Net_Type;

   --  Create a net for SIG, or if one of its dependences has already a net,
   --  merge SIG in this net.
   procedure Merge_Net (Sig : Ghdl_Signal_Ptr)
   is
   begin
      if Sig.S.Mode_Sig in Mode_Signal_User then
         if Sig.S.Resolv = null
           and then Sig.Nbr_Ports = 0
           and then Sig.S.Effective = null
         then
            Internal_Error ("create_nets(1)");
         end if;

         if Sig.S.Effective /= null
           and then Sig.S.Effective.Net /= No_Signal_Net
         then
            --  Avoid to create a net, just merge.
            Set_Net (Sig, Sig.S.Effective.Net, Sig.S.Effective);
            return;
         end if;
      end if;

      if Sig.Nbr_Ports >= 1
        and then Sig.Ports (0).Net /= No_Signal_Net
      then
         --  Avoid to create a net, just merge.
         Set_Net (Sig, Sig.Ports (0).Net, Sig.Ports (0));
      else
         Last_Signal_Net := Last_Signal_Net + 1;
         Set_Net (Sig, Last_Signal_Net, Sig);
      end if;
   end Merge_Net;

   --  Create nets.
   --  For all signals, set the net field.
   procedure Create_Nets
   is
      Sig : Ghdl_Signal_Ptr;
   begin
      Last_Signal_Net := No_Signal_Net;

      for I in reverse Propagation.First .. Propagation.Last loop
         case Propagation.Table (I).Kind is
            when Drv_Error
              | Prop_End =>
               null;
            when Drv_One_Driver
              | Eff_One_Driver =>
               null;
            when Eff_One_Resolved =>
               Sig := Propagation.Table (I).Sig;
               --  Do not create a net if the signal has no dependences.
               if Sig.Net = No_Signal_Net
                 and then (Sig.S.Effective /= null or Sig.Nbr_Ports /= 0)
               then
                  Merge_Net (Sig);
               end if;
            when Drv_One_Port
              | Eff_One_Port
              | Imp_Guard
              | Imp_Quiet
              | Imp_Transaction
              | Imp_Stable
              | Imp_Delayed
              | Eff_Actual
              | Drv_One_Resolved =>
               Sig := Propagation.Table (I).Sig;
               if Sig.Net = No_Signal_Net then
                  Merge_Net (Sig);
               end if;
            when Drv_Multiple
              | Eff_Multiple =>
               declare
                  Resolv : Resolved_Signal_Acc;
                  Link : Ghdl_Signal_Ptr;
               begin
                  Last_Signal_Net := Last_Signal_Net + 1;
                  Resolv := Propagation.Table (I).Resolv;
                  Link := Sig_Table.Table (Resolv.Sig_Range.First);
                  for J in Resolv.Sig_Range.First .. Resolv.Sig_Range.Last loop
                     Set_Net (Sig_Table.Table (J), Last_Signal_Net, Link);
                  end loop;
               end;
            when In_Conversion
              | Out_Conversion =>
               declare
                  Conv : Sig_Conversion_Acc;
                  Link : Ghdl_Signal_Ptr;
               begin
                  Conv := Propagation.Table (I).Conv;
                  Link := Sig_Table.Table (Conv.Src.First);
                  if Link.Net = No_Signal_Net then
                     Last_Signal_Net := Last_Signal_Net + 1;
                     Set_Net (Link, Last_Signal_Net, Link);
                  end if;
               end;
         end case;
      end loop;

      --  Reorder propagation table.
      declare
         type Off_Array is array (Signal_Net_Type range <>) of Signal_Net_Type;
         type Off_Array_Acc is access Off_Array;
         Offs : Off_Array_Acc;
         procedure Free is new Ada.Unchecked_Deallocation
           (Name => Off_Array_Acc, Object => Off_Array);

         Last_Off : Signal_Net_Type;
         Num : Signal_Net_Type;

--          procedure Disp_Offs
--          is
--             use Grt.Astdio;
--             use Grt.Stdio;
--          begin
--             for I in Offs'Range loop
--                if Offs (I) /= 0 then
--                   Put_I32 (stdout, Ghdl_I32 (I));
--                   Put (": ");
--                   Put_I32 (stdout, Ghdl_I32 (Offs (I)));
--                   New_Line;
--                end if;
--             end loop;
--          end Disp_Offs;

         type Propag_Array is array (Signal_Net_Type range <>)
           of Propagation_Type;
         type Propag_Array_Acc is access Propag_Array;
         Propag : Propag_Array_Acc;
         procedure Free is new Ada.Unchecked_Deallocation
           (Name => Propag_Array_Acc, Object => Propag_Array);

         Net : Signal_Net_Type;
      begin
         --  1) Count number of propagation cell per net.
         Offs := new Off_Array (0 .. Last_Signal_Net);
         Offs.all := (others => 0);
         for I in Propagation.First .. Propagation.Last loop
            Net := Get_Propagation_Net (I);
            Offs (Net) := Offs (Net) + 1;
         end loop;
         --  2) Convert this table into offsets.
         Last_Off := 1;
         for I in 1 .. Last_Signal_Net loop
            Num := Offs (I);
            if Num /= 0 then
               --  Reserve one slot for a prepended 'prop_end'.
               Offs (I) := Last_Off + 1;
               Last_Off := Last_Off + 1 + Num;
            end if;
         end loop;
         Num := Offs (0);
         Offs (0) := Last_Off + 1;
         --Last_Off := Last_Off + 1 + Num - 1;

         --  3) Re-order the table (by a copy).
         Propag := new Propag_Array (1 .. Last_Off);
         for I in Propagation.First .. Propagation.Last loop
            Net := Get_Propagation_Net (I);
            if Net /= No_Signal_Net then
               Propag (Offs (Net)) := Propagation.Table (I);
               Offs (Net) := Offs (Net) + 1;
            end if;
         end loop;
         Propagation.Set_Last (Last_Off);
         Propagation.Release;
         for I in Propagation.First .. Propagation.Last loop
            Propagation.Table (I) := Propag (I);
         end loop;
         Free (Propag);
         for I in 1 .. Last_Signal_Net loop
            --  Ignore holes.
            if Offs (I) /= 0 then
               Propagation.Table (Offs (I)) :=
                 (Kind => Prop_End, Updated => True);
            end if;
         end loop;
         Propagation.Table (1) := (Kind => Prop_End, Updated => True);

         --  4) Convert back from offset to start position (on the prop_end
         --     cell).
         Offs (0) := 1;
         Last_Off := 1;
         for I in 1 .. Last_Signal_Net loop
            if Offs (I) /= 0 then
               Num := Offs (I);
               Offs (I) := Last_Off;
               Last_Off := Num;
            end if;
         end loop;

         --  5) Re-map the nets to cell indexes.
         for I in Sig_Table.First .. Sig_Table.Last loop
            Sig := Sig_Table.Table (I);
            if Sig.Net = No_Signal_Net then
               if Sig.S.Resolv /= null then
                  Sig.Net := Net_One_Resolved;
               elsif Sig.S.Nbr_Drivers = 1 then
                  Sig.Net := Net_One_Driver;
               end if;
            else
               Sig.Net := Signal_Net_Type (Offs (Sig.Net));
            end if;
            Sig.Link := null;
         end loop;
         Free (Offs);
      end;
   end Create_Nets;

   function Get_Nbr_Future return Ghdl_I32
   is
      Res : Ghdl_I32;
      Sig : Ghdl_Signal_Ptr;
   begin
      Res := 0;
      Sig := Future_List;
      while Sig.Flink /= null loop
         Res := Res + 1;
         Sig := Sig.Flink;
      end loop;
      return Res;
   end Get_Nbr_Future;

   --  Check every scalar subelement of a resolved signal has a driver
   --  in the same process.
   procedure Check_Resolved_Driver (Resolv : Resolved_Signal_Acc)
   is
      First_Sig : Ghdl_Signal_Ptr;
      Nbr : Ghdl_Index_Type;
   begin
      First_Sig := Sig_Table.Table (Resolv.Sig_Range.First);
      Nbr := First_Sig.S.Nbr_Drivers;
      for I in Resolv.Sig_Range.First + 1 .. Resolv.Sig_Range.Last loop
         if Sig_Table.Table (I).S.Nbr_Drivers /= Nbr then
            --  FIXME: provide more information (signal name, process name).
            Error ("missing drivers for subelement of a resolved signal");
         end if;
      end loop;
   end Check_Resolved_Driver;

   Ieee_Std_Logic_1164_Resolved_Resolv_Ptr : Address;
   pragma Import (C, Ieee_Std_Logic_1164_Resolved_Resolv_Ptr,
                  "ieee__std_logic_1164__resolved_RESOLV_ptr");

   procedure Free is new Ada.Unchecked_Deallocation
     (Name => Resolved_Signal_Acc, Object => Resolved_Signal_Type);

   procedure Order_All_Signals
   is
      Sig : Ghdl_Signal_Ptr;
      Resolv : Resolved_Signal_Acc;
   begin
      --  Do checks and optimization.
      for I in Sig_Table.First .. Sig_Table.Last loop
         Sig := Sig_Table.Table (I);

         --  LRM 5.3
         --  If, by the above rules, no disconnection specification applies to
         --  the drivers of a guarded, scalar signal S whose type mark is T
         --  (including a scalar subelement of a composite signal), then the
         --  following default disconnection specification is implicitly
         --  assumed:
         --    disconnect S : T after 0 ns;
         if Sig.S.Mode_Sig in Mode_Signal_User then
            Resolv := Sig.S.Resolv;
            if Resolv /= null and then Resolv.Disconnect_Time = Bad_Time then
               Resolv.Disconnect_Time := 0;
            end if;

            if Resolv /= null
              and then Resolv.Sig_Range.First = I
              and then Resolv.Sig_Range.Last > I
            then
               --  Check every scalar subelement of a resolved signal
               --  has a driver in the same process.
               Check_Resolved_Driver (Resolv);
            end if;

            if Resolv /= null
              and then Resolv.Sig_Range.First = I
              and then Resolv.Sig_Range.Last = I
              and then (Resolv.Resolv_Proc
                        = Ieee_Std_Logic_1164_Resolved_Resolv_Ptr)
              and then Sig.S.Nbr_Drivers + Sig.Nbr_Ports <= 1
            then
               --  Optimization: remove resolver if there is at most one
               --  source.
               Free (Sig.S.Resolv);
            end if;
         end if;
      end loop;

      --  Really order them.
      for I in Sig_Table.First .. Sig_Table.Last loop
         Order_Signal (Sig_Table.Table (I), Propag_Driving);
      end loop;
      for I in Sig_Table.First .. Sig_Table.Last loop
         Order_Signal (Sig_Table.Table (I), Propag_Done);
      end loop;

      Create_Nets;
   end Order_All_Signals;

   procedure Set_Guard_Activity (Sig : Ghdl_Signal_Ptr) is
   begin
      for I in 1 .. Sig.Nbr_Ports loop


context:
space:
mode: