unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 763d44a23e17b3af7de56d1dedaaeffefa7c576f 122180 bytes (raw)
name: lisp/emacs-lisp/comp.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
 
;;; comp.el --- compilation of Lisp code into native code -*- lexical-binding: t -*-

;; Author: Andrea Corallo <akrl@sdf.com>

;; Copyright (C) 2019-2020 Free Software Foundation, Inc.

;; Keywords: lisp
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:
;; This code is an attempt to make the pig fly.
;; Or, to put it another way to make a 911 out of a turbocharged VW Bug.

;;; Code:

(require 'bytecomp)
(require 'cl-extra)
(require 'cl-lib)
(require 'cl-macs)
(require 'cl-seq)
(require 'gv)
(require 'rx)
(require 'subr-x)
(require 'warnings)

(defgroup comp nil
  "Emacs Lisp native compiler."
  :group 'lisp)

(defcustom comp-speed 2
  "Compiler optimization level.  From -1 to 3.
- -1 functions are kept in bytecode form and no native compilation is performed.
- 0 native compilation is performed with no optimizations.
- 1 lite optimizations.
- 2 max optimization level fully adherent to the language semantic.
- 3 max optimization level, to be used only when necessary.
    Warning: the compiler is free to perform dangerous optimizations."
  :type 'number
  :group 'comp)

(defcustom comp-debug 0
  "Compiler debug level.  From 0 to 3.
This intended for debugging the compiler itself.
- 0 no debug facility.
    This is the recommended value unless you are debugging the compiler itself.
- 1 emit debug symbols and dump pseudo C code.
- 2 dump gcc passes and libgccjit log file.
- 3 dump libgccjit reproducers."
  :type 'number
  :group 'comp)

(defcustom comp-verbose 0
  "Compiler verbosity.  From 0 to 3.
This intended for debugging the compiler itself.
- 0 no logging.
- 1 final limple is logged.
- 2 LAP and final limple and some pass info are logged.
- 3 max verbosity."
  :type 'number
  :group 'comp)

(defcustom comp-always-compile nil
  "Unconditionally (re-)compile all files."
  :type 'boolean
  :group 'comp)

(defcustom comp-deferred-compilation-black-list
  '()
  "List of regexps to exclude files from deferred native compilation.
Skip if any is matching."
  :type 'list
  :group 'comp)

(defcustom comp-bootstrap-black-list
  '()
  "List of regexps to exclude files from native compilation during bootstrap.
Skip if any is matching."
  :type 'list
  :group 'comp)

(defcustom comp-never-optimize-functions
  '(;; The following two are mandatory for Emacs to be working
    ;; correctly (see comment in `advice--add-function'). DO NOT
    ;; REMOVE.
    macroexpand rename-buffer)
  "Primitive functions for which we do not perform trampoline optimization."
  :type 'list
  :group 'comp)

(defcustom comp-async-jobs-number 0
  "Default number of processes used for async compilation.
When zero use half of the CPUs or at least one."
  :type 'number
  :group 'comp)

(defcustom comp-async-cu-done-hook nil
  "This hook is run whenever an asyncronous native compilation
finishes compiling a single compilation unit.
The argument FILE passed to the function is the filename used as
compilation input."
  :type 'hook
  :group 'comp)

(defcustom comp-async-all-done-hook nil
  "This hook is run whenever the asyncronous native compilation
finishes compiling all input files."
  :type 'hook
  :group 'comp)

(defcustom comp-async-env-modifier-form nil
  "Form to be evaluated by each asyncronous compilation worker
before compilation.  Usable to modify the compiler environment."
  :type 'list
  :group 'comp)

(defcustom comp-native-driver-options nil
  "Options passed verbatim to the native compiler's backend driver.
Note that not all options are meaningful; typically only the options
affecting the assembler and linker are likely to be useful.

Passing these options is only available in libgccjit version 9
and above."
  :type 'list
  :group 'comp)

(defvar comp-dry-run nil
  "When non-nil run everything but the C back-end.")

(defconst comp-valid-source-re (rx ".el" (? ".gz") eos)
  "Regexp to match filename of valid input source files.")

(defconst comp-log-buffer-name "*Native-compile-Log*"
  "Name of the native-compiler log buffer.")

(defconst comp-async-buffer-name "*Async-native-compile-log*"
  "Name of the async compilation buffer log.")

(defvar comp-native-compiling nil
  "This gets bound to t while native compilation.
Can be used by code that wants to expand differently in this case.")

(defvar comp-pass nil
  "Every pass has the right to bind what it likes here.")

(defvar comp-curr-allocation-class 'd-default
  "Current allocation class.
Can be one of: 'd-default', 'd-impure' or 'd-ephemeral'.  See `comp-ctxt'.")

(defconst comp-passes '(comp-spill-lap
                        comp-limplify
                        comp-fwprop
                        comp-call-optim
                        comp-ipa-pure
                        comp-fwprop
                        comp-dead-code
                        comp-tco
                        comp-fwprop
                        comp-remove-type-hints
                        comp-final)
  "Passes to be executed in order.")

(defvar comp-disabled-passes '()
  "List of disabled passes.
For internal use only by the testsuite.")

(defvar comp-post-pass-hooks ()
  "Alist PASS FUNCTIONS.
Each function in FUNCTIONS is run after PASS.
Useful to hook into pass checkers.")

(defconst comp-known-ret-types '((cons . cons)
                                 (1+ . number)
                                 (1- . number)
                                 (+ . number)
                                 (- . number)
                                 (* . number)
                                 (/ . number)
                                 (% . number)
                                 ;; Type hints
                                 (comp-hint-fixnum . fixnum)
                                 (comp-hint-cons . cons))
  "Alist used for type propagation.")

(defconst comp-symbol-values-optimizable '(most-positive-fixnum
                                           most-negative-fixnum)
  "Symbol values we can resolve in the compile-time.")

(defconst comp-type-hints '(comp-hint-fixnum
                            comp-hint-cons)
  "List of fake functions used to give compiler hints.")

(defconst comp-limple-sets '(set
                             setimm
                             set-par-to-local
                             set-args-to-local
                             set-rest-args-to-local)
  "Limple set operators.")

(defconst comp-limple-assignments `(fetch-handler
                                    ,@comp-limple-sets)
  "Limple operators that clobbers the first m-var argument.")

(defconst comp-limple-calls '(call
                              callref
                              direct-call
                              direct-callref)
  "Limple operators use to call subrs.")

(define-error 'native-compiler-error-dyn-func
  "can't native compile a non lexical scoped function"
  'native-compiler-error)
(define-error 'native-compiler-error-empty-byte
  "empty byte compiler output"
  'native-compiler-error)

(eval-when-compile
  (defconst comp-op-stack-info
    (cl-loop with h = (make-hash-table)
	     for k across byte-code-vector
	     for v across byte-stack+-info
	     when k
	     do (puthash k v h)
	     finally return h)
    "Hash table lap-op -> stack adjustment."))

(cl-defstruct comp-data-container
  "Data relocation container structure."
  (l () :type list
     :documentation "Constant objects used by functions.")
  (idx (make-hash-table :test #'equal) :type hash-table
       :documentation "Obj -> position into the previous field."))

(cl-defstruct comp-ctxt
  "Lisp side of the compiler context."
  (output nil :type string
          :documentation "Target output file-name for the compilation.")
  (top-level-forms () :type list
                   :documentation "List of spilled top level forms.")
  (funcs-h (make-hash-table :test #'equal) :type hash-table
           :documentation "c-name -> comp-func.")
  (sym-to-c-name-h (make-hash-table :test #'eq) :type hash-table
                   :documentation "symbol-function -> c-name.
This is only for optimizing intra CU calls at speed 3.")
  (byte-func-to-func-h (make-hash-table :test #'equal) :type hash-table
                     :documentation "byte-function -> comp-func.
Needed to replace immediate byte-compiled lambdas with the compiled reference.")
  (lambda-fixups-h (make-hash-table :test #'equal) :type hash-table
                   :documentation  "Hash table byte-func -> mvar to fixup.")
  (function-docs (make-hash-table :test #'eql) :type (or hash-table vector)
               :documentation "Documentation index -> documentation")
  (d-default (make-comp-data-container) :type comp-data-container
             :documentation "Standard data relocated in use by functions.")
  (d-impure (make-comp-data-container) :type comp-data-container
            :documentation "Relocated data that cannot be moved into pure space.
This is tipically for top-level forms other than defun.")
  (d-ephemeral (make-comp-data-container) :type comp-data-container
               :documentation "Relocated data not necessary after load.")
  (with-late-load nil :type boolean
                  :documentation "When non-nil support late load."))

(cl-defstruct comp-args-base
  (min nil :type number
       :documentation "Minimum number of arguments allowed."))

(cl-defstruct (comp-args (:include comp-args-base))
  (max nil :type number
       :documentation "Maximum number of arguments allowed.
To be used when ncall-conv is nil."))

(cl-defstruct (comp-nargs (:include comp-args-base))
  "Describe args when the function signature is of kind:
(ptrdiff_t nargs, Lisp_Object *args)."
  (nonrest nil :type number
           :documentation "Number of non rest arguments.")
  (rest nil :type boolean
        :documentation "t if rest argument is present."))

(cl-defstruct (comp-block (:copier nil)
                          (:constructor nil))
  "A base class for basic blocks."
  (name nil :type symbol)
  (insns () :type list
         :documentation "List of instructions.")
  (closed nil :type boolean
          :documentation "t if closed.")
  ;; All the followings are for SSA and CGF analysis.
  ;; Keep in sync with `comp-clean-ssa'!!
  (in-edges () :type list
            :documentation "List of incoming edges.")
  (out-edges () :type list
             :documentation "List of out-coming edges.")
  (dom nil :type comp-block
        :documentation "Immediate dominator.")
  (df (make-hash-table) :type hash-table
      :documentation "Dominance frontier set. Block-name -> block")
  (post-num nil :type number
            :documentation "Post order number.")
  (final-frame nil :type vector
             :documentation "This is a copy of the frame when leaving the block.
Is in use to help the SSA rename pass."))

(cl-defstruct (comp-block-lap (:copier nil)
                              (:include comp-block)
                              (:constructor make--comp-block-lap
                                            (addr sp name))) ; Positional
  "A basic block created from lap."
  ;; These two slots are used during limplification.
  (sp nil :type number
      :documentation "When non-nil indicates the sp value while entering
into it.")
  (addr nil :type number
        :documentation "Start block LAP address."))

(cl-defstruct (comp-latch (:copier nil)
                          (:include comp-block))
  "A basic block for a latch loop.")

(cl-defstruct (comp-edge (:copier nil) (:constructor make--comp-edge))
  "An edge connecting two basic blocks."
  (src nil :type comp-block)
  (dst nil :type comp-block)
  (number nil :type number
          :documentation "The index number corresponding to this edge in the
 edge vector."))

(defun comp-block-preds (basic-block)
  "Given BASIC-BLOCK return the list of its predecessors."
  (mapcar #'comp-edge-src (comp-block-in-edges basic-block)))

(defun comp-gen-counter ()
  "Return a sequential number generator."
  (let ((n -1))
    (lambda ()
      (cl-incf n))))

(cl-defstruct (comp-func (:copier nil))
  "LIMPLE representation of a function."
  (name nil :type symbol
        :documentation "Function symbol name. Nil indicates anonymous.")
  (c-name nil :type string
          :documentation "The function name in the native world.")
  (byte-func nil
             :documentation "Byte compiled version.")
  (doc nil :type string
       :documentation "Doc string.")
  (int-spec nil :type list
            :documentation "Interactive form.")
  (lap () :type list
       :documentation "LAP assembly representation.")
  (ssa-status nil :type symbol
       :documentation "SSA status either: 'nil', 'dirty' or 't'.
Once in SSA form this *must* be set to 'dirty' every time the topology of the
CFG is mutated by a pass.")
  (frame-size nil :type number)
  (blocks (make-hash-table) :type hash-table
          :documentation "Key is the basic block symbol value is a comp-block
structure.")
  (lap-block (make-hash-table :test #'equal) :type hash-table
             :documentation "LAP lable -> LIMPLE basic block name.")
  (edges () :type list
         :documentation "List of edges connecting basic blocks.")
  (block-cnt-gen (funcall #'comp-gen-counter) :type function
                 :documentation "Generates block numbers.")
  (edge-cnt-gen (funcall #'comp-gen-counter) :type function
                :documentation "Generates edges numbers.")
  (has-non-local nil :type boolean
                 :documentation "t if non local jumps are present.")
  (array-h (make-hash-table) :type hash-table
           :documentation "array idx -> array length.")
  (speed nil :type number
         :documentation "Optimization level (see `comp-speed').")
  (pure nil :type boolean
        :documentation "t if pure nil otherwise."))

(cl-defstruct (comp-func-l (:include comp-func))
  "Lexical scoped function."
  (args nil :type comp-args-base
        :documentation "Argument specification of the function"))

(cl-defstruct (comp-func-d (:include comp-func))
  "Dynamic scoped function."
  (lambda-list nil :type list
        :documentation "Original lambda-list."))

(cl-defstruct (comp-mvar (:constructor make--comp-mvar))
  "A meta-variable being a slot in the meta-stack."
  (id nil :type (or null number)
      :documentation "Unique id when in SSA form.")
  (slot nil :type (or fixnum symbol)
        :documentation "Slot number in the array if a number or
        'scratch' for scratch slot.")
  (const-vld nil :type boolean
             :documentation "Valid signal for the following slot.")
  (constant nil
            :documentation "When const-vld non-nil this is used for holding
 a value known at compile time.")
  (type nil :type symbol
        :documentation "When non-nil indicates the type when known at compile
 time."))

;; Special vars used by some passes
(defvar comp-func)

\f

(defun comp-ensure-native-compiler ()
  "Make sure Emacs has native compiler support and libgccjit is laodable.
Raise and error otherwise.
To be used by all entry points."
  (cond
   ((null (boundp 'comp-ctxt))
    (error "Emacs not compiled with native compiler support (--with-nativecomp)"))
   ((null (native-comp-available-p))
    (error "Cannot find libgccjit"))))

(defsubst comp-set-op-p (op)
  "Assignment predicate for OP."
  (when (memq op comp-limple-sets) t))

(defsubst comp-assign-op-p (op)
  "Assignment predicate for OP."
  (when (memq op comp-limple-assignments) t))

(defsubst comp-call-op-p (op)
  "Call predicate for OP."
  (when (memq op comp-limple-calls) t))

(defsubst comp-limple-insn-call-p (insn)
  "Limple INSN call predicate."
  (comp-call-op-p (car-safe insn)))

(defsubst comp-type-hint-p (func)
  "Type hint predicate for function name FUNC."
  (when (memq func comp-type-hints) t))

(defun comp-func-unique-in-cu-p (func)
  "Return t if FUNC is know to be unique in the current compilation unit."
  (if (symbolp func)
      (cl-loop with h = (make-hash-table :test #'eq)
               for f being the hash-value in (comp-ctxt-funcs-h comp-ctxt)
               for name = (comp-func-name f)
               when (gethash name h)
                 return nil
               do (puthash name t h)
               finally return t)
    t))

(defsubst comp-symbol-func-to-fun (symbol-funcion)
  "Given a function called SYMBOL-FUNCION return its `comp-func'."
  (gethash (gethash symbol-funcion (comp-ctxt-sym-to-c-name-h
                                    comp-ctxt))
           (comp-ctxt-funcs-h comp-ctxt)))

(defsubst comp-function-pure-p (f)
  "Return t if F is pure."
  (or (get f 'pure)
      (when-let ((func (comp-symbol-func-to-fun f)))
        (comp-func-pure func))))

(defsubst comp-alloc-class-to-container (alloc-class)
  "Given ALLOC-CLASS return the data container for the current context.
Assume allocaiton class 'd-default as default."
  (cl-struct-slot-value 'comp-ctxt (or alloc-class 'd-default) comp-ctxt))

(defsubst comp-add-const-to-relocs (obj)
  "Keep track of OBJ into the ctxt relocations."
  (puthash obj t (comp-data-container-idx (comp-alloc-class-to-container
                                           comp-curr-allocation-class))))

\f
;;; Log rountines.

(defconst comp-limple-lock-keywords
  `((,(rx bol "(comment" (1+ not-newline)) . font-lock-comment-face)
    (,(rx "#s(" (group-n 1 "comp-mvar"))
     (1 font-lock-function-name-face))
    (,(rx bol "(" (group-n 1 "phi"))
     (1 font-lock-variable-name-face))
    (,(rx (group-n 1 (or "entry"
                         (seq (or "entry_" "entry_fallback_" "bb_")
                              (1+ num)))))
     (1 font-lock-constant-face))
    (,(rx "(" (group-n 1 (1+ (or word "-"))))
     (1 font-lock-keyword-face)))
  "Highlights used by comp-limple-mode.")

(define-derived-mode comp-limple-mode fundamental-mode "LIMPLE"
  "Syntax highlight LIMPLE IR."
  (setf font-lock-defaults '(comp-limple-lock-keywords)))

(cl-defun comp-log (data &optional (level 1))
  "Log DATA at LEVEL.
LEVEL is a number from 1-3; if it is less than `comp-verbose', do
nothing.  If `noninteractive', log with `message'.  Otherwise,
log with `comp-log-to-buffer'."
  (when (>= comp-verbose level)
    (if noninteractive
        (cl-typecase data
          (atom (message "%s" data))
          (t (dolist (elem data)
               (message "%s" elem))))
      (comp-log-to-buffer data))))

(cl-defun comp-log-to-buffer (data)
  "Log DATA to `comp-log-buffer-name'."
  (let* ((log-buffer
          (or (get-buffer comp-log-buffer-name)
              (with-current-buffer (get-buffer-create comp-log-buffer-name)
                (setf buffer-read-only t)
                (current-buffer))))
         (log-window (get-buffer-window log-buffer))
         (inhibit-read-only t)
         at-end-p)
    (with-current-buffer log-buffer
      (unless (eq major-mode 'comp-limple-mode)
        (comp-limple-mode))
      (when (= (point) (point-max))
        (setf at-end-p t))
      (save-excursion
        (goto-char (point-max))
        (cl-typecase data
          (atom (princ data log-buffer))
          (t (dolist (elem data)
               (princ elem log-buffer)
               (insert "\n"))))
        (insert "\n"))
      (when (and at-end-p log-window)
        ;; When log window's point is at the end, follow the tail.
        (with-selected-window log-window
          (goto-char (point-max)))))))

(defun comp-log-func (func verbosity)
  "Log function FUNC.
VERBOSITY is a number between 0 and 3."
  (when (>= comp-verbose verbosity)
    (comp-log (format "\nFunction: %s\n" (comp-func-name func)) verbosity)
    (cl-loop for block-name being each hash-keys of (comp-func-blocks func)
             using (hash-value bb)
             do (comp-log (concat "<" (symbol-name block-name) ">") verbosity)
                (comp-log (comp-block-insns bb) verbosity))))

(defun comp-log-edges (func)
  "Log edges in FUNC."
  (let ((edges (comp-func-edges func)))
    (comp-log (format "\nEdges in function: %s\n"
                      (comp-func-name func))
              2)
    (mapc (lambda (e)
            (comp-log (format "n: %d src: %s dst: %s\n"
                              (comp-edge-number e)
                              (comp-block-name (comp-edge-src e))
                              (comp-block-name (comp-edge-dst e)))
                      2))
          edges)))

\f

(defmacro comp-loop-insn-in-block (basic-block &rest body)
  "Loop over all insns in BASIC-BLOCK executning BODY.
Inside BODY `insn' can be used to read or set the current
instruction."
  (declare (debug (form body))
           (indent defun))
  (let ((sym-cell (gensym "cell-")))
    `(cl-symbol-macrolet ((insn (car ,sym-cell)))
       (cl-loop for ,sym-cell on (comp-block-insns ,basic-block)
	        do ,@body))))
\f
;;; spill-lap pass specific code.

(defsubst comp-lex-byte-func-p (f)
  "Return t if F is a lexical scoped byte compiled function."
  (and (byte-code-function-p f)
       (fixnump (aref f 0))))

(defun comp-spill-decl-spec (function-name spec)
  "Return the declared specifier SPEC for FUNCTION-NAME."
  (plist-get (cdr (assq function-name byte-to-native-plist-environment))
             spec))

(defun comp-spill-speed (function-name)
  "Return the speed for FUNCTION-NAME."
  (or (comp-spill-decl-spec function-name 'speed)
      comp-speed))

;; Autoloaded as might by used by `disassemble-internal'.
;;;###autoload
(defun comp-c-func-name (name prefix &optional first)
  "Given NAME return a name suitable for the native code.
Add PREFIX in front of it.  If FIRST is not nil pick the first
available name ignoring compilation context and potential name
clashes."
  ;; Unfortunatelly not all symbol names are valid as C function names...
  ;; Nassi's algorithm here:
  (let* ((orig-name (if (symbolp name) (symbol-name name) name))
         (crypted (cl-loop with str = (make-string (* 2 (length orig-name)) 0)
	                   for j from 0 by 2
	                   for i across orig-name
	                   for byte = (format "%x" i)
	                   do (aset str j (aref byte 0))
	                      (aset str (1+ j) (aref byte 1))
	                   finally return str))
         (human-readable (replace-regexp-in-string
                          "-" "_" orig-name))
         (human-readable (replace-regexp-in-string
                          (rx (not (any "0-9a-z_"))) "" human-readable)))
    (if (null first)
        ;; Prevent C namespace conflicts.
        (cl-loop
         with h = (comp-ctxt-funcs-h comp-ctxt)
         for i from 0
         for c-sym = (concat prefix crypted "_" human-readable "_"
                             (number-to-string i))
         unless (gethash c-sym h)
         return c-sym)
      ;; When called out of a compilation context (ex disassembling)
      ;; pick the first one.
      (concat prefix crypted "_" human-readable "_0"))))

(defun comp-decrypt-arg-list (x function-name)
  "Decript argument list X for FUNCTION-NAME."
  (unless (fixnump x)
    (signal 'native-compiler-error-dyn-func function-name))
  (let ((rest (not (= (logand x 128) 0)))
        (mandatory (logand x 127))
        (nonrest (ash x -8)))
    (if (and (null rest)
             (< nonrest 9)) ;; SUBR_MAX_ARGS
        (make-comp-args :min mandatory
                        :max nonrest)
      (make-comp-nargs :min mandatory
                       :nonrest nonrest
                       :rest rest))))

(defsubst comp-byte-frame-size (byte-compiled-func)
  "Given BYTE-COMPILED-FUNC return the frame size to be allocated."
  (aref byte-compiled-func 3))

(defun comp-add-func-to-ctxt (func)
  "Add FUNC to the current compiler contex."
  (let ((name (comp-func-name func))
        (c-name (comp-func-c-name func)))
    (puthash name c-name (comp-ctxt-sym-to-c-name-h comp-ctxt))
    (puthash c-name func (comp-ctxt-funcs-h comp-ctxt))))

(cl-defgeneric comp-spill-lap-function (input)
  "Byte compile INPUT and spill lap for further stages.")

(cl-defmethod comp-spill-lap-function ((function-name symbol))
  "Byte compile FUNCTION-NAME spilling data from the byte compiler."
  (let* ((f (symbol-function function-name))
         (c-name (comp-c-func-name function-name "F"))
         (func (make-comp-func-l :name function-name
                                 :c-name c-name
                                 :doc (documentation f t)
                                 :int-spec (interactive-form f)
                                 :speed (comp-spill-speed function-name)
                                 :pure (comp-spill-decl-spec function-name
                                                             'pure))))
      (when (byte-code-function-p f)
        (signal 'native-compiler-error
                "can't native compile an already bytecompiled function"))
      (setf (comp-func-byte-func func)
            (byte-compile (comp-func-name func)))
      (let ((lap (byte-to-native-lambda-lap
                  (gethash (aref (comp-func-byte-func func) 1)
                           byte-to-native-lambdas-h))))
        (cl-assert lap)
        (comp-log lap 2)
        (let ((arg-list (aref (comp-func-byte-func func) 0)))
          (setf (comp-func-l-args func)
                (comp-decrypt-arg-list arg-list function-name)
                (comp-func-lap func)
                lap
                (comp-func-frame-size func)
                (comp-byte-frame-size (comp-func-byte-func func))))
        (setf (comp-ctxt-top-level-forms comp-ctxt)
              (list (make-byte-to-native-func-def :name function-name
                                                  :c-name c-name)))
        ;; Create the default array.
        (puthash 0 (comp-func-frame-size func) (comp-func-array-h func))
        (comp-add-func-to-ctxt func))))

(defun comp-intern-func-in-ctxt (_ obj)
  "Given OBJ of type `byte-to-native-lambda' create a function in `comp-ctxt'."
  (when-let ((byte-func (byte-to-native-lambda-byte-func obj)))
    (let* ((lap (byte-to-native-lambda-lap obj))
           (top-l-form (cl-loop
                        for form in (comp-ctxt-top-level-forms comp-ctxt)
                        when (and (byte-to-native-func-def-p form)
                                  (eq (byte-to-native-func-def-byte-func form)
                                      byte-func))
                        return form))
           (name (when top-l-form
                   (byte-to-native-func-def-name top-l-form)))
           (c-name (comp-c-func-name (or name "anonymous-lambda") "F"))
           (func (if (comp-lex-byte-func-p byte-func)
                     (make-comp-func-l
                      :args (comp-decrypt-arg-list (aref byte-func 0)
                                                   name))
                   (make-comp-func-d :lambda-list (aref byte-func 0)))))
      (setf (comp-func-name func) name
            (comp-func-byte-func func) byte-func
            (comp-func-doc func) (documentation byte-func t)
            (comp-func-int-spec func) (interactive-form byte-func)
            (comp-func-c-name func) c-name
            (comp-func-lap func) lap
            (comp-func-frame-size func) (comp-byte-frame-size byte-func)
            (comp-func-speed func) (comp-spill-speed name)
            (comp-func-pure func) (comp-spill-decl-spec name 'pure))

      ;; Store the c-name to have it retrivable from
      ;; `comp-ctxt-top-level-forms'.
      (when top-l-form
        (setf (byte-to-native-func-def-c-name top-l-form) c-name))
      (unless name
        (puthash byte-func func (comp-ctxt-byte-func-to-func-h comp-ctxt)))
      ;; Create the default array.
      (puthash 0 (comp-func-frame-size func) (comp-func-array-h func))
      (comp-add-func-to-ctxt func)
      (comp-log (format "Function %s:\n" name) 1)
      (comp-log lap 1))))

(cl-defmethod comp-spill-lap-function ((filename string))
  "Byte compile FILENAME spilling data from the byte compiler."
  (byte-compile-file filename)
  (unless byte-to-native-top-level-forms
    (signal 'native-compiler-error-empty-byte filename))
  (setf (comp-ctxt-top-level-forms comp-ctxt)
        (cl-loop
         for form in (reverse byte-to-native-top-level-forms)
         collect
         (if (and (byte-to-native-func-def-p form)
                  (eq -1
                      (comp-spill-speed (byte-to-native-func-def-name form))))
             (let ((byte-code (byte-to-native-func-def-byte-func form)))
               (remhash byte-code byte-to-native-lambdas-h)
               (make-byte-to-native-top-level
                :form `(defalias
                         ',(byte-to-native-func-def-name form)
                         ,byte-code
                         nil)
                :lexical (comp-lex-byte-func-p byte-code)))
           form)))
  (maphash #'comp-intern-func-in-ctxt byte-to-native-lambdas-h))

(defun comp-spill-lap (input)
  "Byte compile and spill the LAP representation for INPUT.
If INPUT is a symbol this is the function-name to be compiled.
If INPUT is a string this is the file path to be compiled."
  (let ((byte-native-compiling t)
        (byte-to-native-lambdas-h (make-hash-table :test #'eq))
        (byte-to-native-top-level-forms ())
        (byte-to-native-plist-environment ()))
    (comp-spill-lap-function input)))

\f
;;; Limplification pass specific code.

(cl-defstruct (comp-limplify (:copier nil))
  "Support structure used during function limplification."
  (frame nil :type vector
         :documentation "Meta-stack used to flat LAP.")
  (curr-block nil :type comp-block
              :documentation "Current block being limplified.")
  (sp -1 :type number
      :documentation "Current stack pointer while walking LAP.
Points to the next slot to be filled.")
  (pc 0 :type number
      :documentation "Current program counter while walking LAP.")
  (label-to-addr nil :type hash-table
                 :documentation "LAP hash table -> address.")
  (pending-blocks () :type list
                  :documentation "List of blocks waiting for limplification."))

(defconst comp-lap-eob-ops
  '(byte-goto byte-goto-if-nil byte-goto-if-not-nil byte-goto-if-nil-else-pop
              byte-goto-if-not-nil-else-pop byte-return byte-pushcatch
              byte-switch byte-pushconditioncase)
  "LAP end of basic blocks op codes.")

(defsubst comp-lap-eob-p (inst)
  "Return t if INST closes the current basic blocks, nil otherwise."
  (when (memq (car inst) comp-lap-eob-ops)
    t))

(defsubst comp-lap-fall-through-p (inst)
  "Return t if INST fall through, nil otherwise."
  (when (not (memq (car inst) '(byte-goto byte-return)))
    t))

(defsubst comp-sp ()
  "Current stack pointer."
  (declare (gv-setter (lambda (val)
                        `(setf (comp-limplify-sp comp-pass) ,val))))
  (comp-limplify-sp comp-pass))

(defmacro comp-with-sp (sp &rest body)
  "Execute BODY setting the stack pointer to SP.
Restore the original value afterwards."
  (declare (debug (form body))
           (indent defun))
  (let ((sym (gensym)))
    `(let ((,sym (comp-sp)))
       (setf (comp-sp) ,sp)
       (progn ,@body)
       (setf (comp-sp) ,sym))))

(defsubst comp-slot-n (n)
  "Slot N into the meta-stack."
  (aref (comp-limplify-frame comp-pass) n))

(defsubst comp-slot ()
  "Current slot into the meta-stack pointed by sp."
  (comp-slot-n (comp-sp)))

(defsubst comp-slot+1 ()
  "Slot into the meta-stack pointed by sp + 1."
  (comp-slot-n (1+ (comp-sp))))

(defsubst comp-label-to-addr (label)
  "Find the address of LABEL."
  (or (gethash label (comp-limplify-label-to-addr comp-pass))
      (signal 'native-ice (list "label not found" label))))

(defsubst comp-mark-curr-bb-closed ()
  "Mark the current basic block as closed."
  (setf (comp-block-closed (comp-limplify-curr-block comp-pass)) t))

(defun comp-bb-maybe-add (lap-addr &optional sp)
  "If necessary create a pending basic block for LAP-ADDR with stack depth SP.
The basic block is returned regardless it was already declared or not."
  (let ((bb (or (cl-loop  ; See if the block was already limplified.
                 for bb being the hash-value in (comp-func-blocks comp-func)
                 when (and (comp-block-lap-p bb)
                           (equal (comp-block-lap-addr bb) lap-addr))
                   return bb)
                (cl-find-if (lambda (bb) ; Look within the pendings blocks.
                              (and (comp-block-lap-p bb)
                                   (= (comp-block-lap-addr bb) lap-addr)))
                            (comp-limplify-pending-blocks comp-pass)))))
    (if bb
        (progn
          (unless (or (null sp) (= sp (comp-block-lap-sp bb)))
            (signal 'native-ice (list "incoherent stack pointers"
                                      sp (comp-block-lap-sp bb))))
          bb)
      (car (push (make--comp-block-lap lap-addr sp (comp-new-block-sym))
                 (comp-limplify-pending-blocks comp-pass))))))

(defsubst comp-call (func &rest args)
  "Emit a call for function FUNC with ARGS."
  `(call ,func ,@args))

(defun comp-callref (func nargs stack-off)
  "Emit a call using narg abi for FUNC.
NARGS is the number of arguments.
STACK-OFF is the index of the first slot frame involved."
  `(callref ,func ,@(cl-loop repeat nargs
                             for sp from stack-off
                             collect (comp-slot-n sp))))

(cl-defun make-comp-mvar (&key slot (constant nil const-vld) type)
  (when const-vld
    (comp-add-const-to-relocs constant))
  (make--comp-mvar :slot slot :const-vld const-vld :constant constant
                   :type type))

(defun comp-new-frame (size &optional ssa)
  "Return a clean frame of meta variables of size SIZE.
If SSA non-nil populate it of m-var in ssa form."
  (cl-loop with v = (make-vector size nil)
           for i below size
           for mvar = (if ssa
                          (make-comp-ssa-mvar :slot i)
                        (make-comp-mvar :slot i))
           do (aset v i mvar)
           finally return v))

(defsubst comp-emit (insn)
  "Emit INSN into basic block BB."
  (let ((bb (comp-limplify-curr-block comp-pass)))
    (cl-assert (not (comp-block-closed bb)))
    (push insn (comp-block-insns bb))))

(defsubst comp-emit-set-call (call)
  "Emit CALL assigning the result the the current slot frame.
If the callee function is known to have a return type propagate it."
  (cl-assert call)
  (comp-emit (list 'set (comp-slot) call)))

(defun comp-copy-slot (src-n &optional dst-n)
  "Set slot number DST-N to slot number SRC-N as source.
If DST-N is specified use it otherwise assume it to be the current slot."
  (comp-with-sp (or dst-n (comp-sp))
    (let ((src-slot (comp-slot-n src-n)))
      (cl-assert src-slot)
      (comp-emit `(set ,(comp-slot) ,src-slot)))))

(defsubst comp-emit-annotation (str)
  "Emit annotation STR."
  (comp-emit `(comment ,str)))

(defsubst comp-emit-setimm (val)
  "Set constant VAL to current slot."
  (comp-add-const-to-relocs val)
  ;; Leave relocation index nil on purpose, will be fixed-up in final
  ;; by `comp-finalize-relocs'.
  (comp-emit `(setimm ,(comp-slot) ,val)))

(defun comp-make-curr-block (block-name entry-sp &optional addr)
  "Create a basic block with BLOCK-NAME and set it as current block.
ENTRY-SP is the sp value when entering.
The block is added to the current function.
The block is returned."
  (let ((bb (make--comp-block-lap addr entry-sp block-name)))
    (setf (comp-limplify-curr-block comp-pass) bb
          (comp-limplify-pc comp-pass) addr
          (comp-limplify-sp comp-pass) (when (comp-block-lap-p bb)
                                         (comp-block-lap-sp bb)))
    (puthash (comp-block-name bb) bb (comp-func-blocks comp-func))
    bb))

(defun comp-latch-make-fill (target)
  "Create a latch pointing to TARGET and fill it.
Return the created latch"
  (let ((latch (make-comp-latch :name (comp-new-block-sym "latch")))
        (curr-bb (comp-limplify-curr-block comp-pass)))
    ;; See `comp-make-curr-block'.
    (setf (comp-limplify-curr-block comp-pass) latch)
    (when (< (comp-func-speed comp-func) 3)
      ;; At speed 3 the programmer is responsible to manually
      ;; place `comp-maybe-gc-or-quit'.
      (comp-emit '(call comp-maybe-gc-or-quit)))
    ;; See `comp-emit-uncond-jump'.
    (comp-emit `(jump ,(comp-block-name target)))
    (comp-mark-curr-bb-closed)
    (puthash (comp-block-name latch) latch (comp-func-blocks comp-func))
    (setf (comp-limplify-curr-block comp-pass) curr-bb)
    latch))

(defun comp-emit-uncond-jump (lap-label)
  "Emit an unconditional branch to LAP-LABEL."
  (cl-destructuring-bind (label-num . stack-depth) lap-label
    (when stack-depth
      (cl-assert (= (1- stack-depth) (comp-sp))))
    (let* ((target-addr (comp-label-to-addr label-num))
           (target (comp-bb-maybe-add target-addr
                                      (comp-sp)))
           (latch (when (< target-addr (comp-limplify-pc comp-pass))
                    (comp-latch-make-fill target)))
           (eff-target-name (comp-block-name (or latch target))))
      (comp-emit `(jump ,eff-target-name))
      (comp-mark-curr-bb-closed))))

(defun comp-emit-cond-jump (a b target-offset lap-label negated)
  "Emit a conditional jump to LAP-LABEL when A and B satisfy EQ.
TARGET-OFFSET is the positive offset on the SP when branching to the target
block.
If NEGATED non null negate the tested condition.
Return value is the fall through block name."
  (cl-destructuring-bind (label-num . label-sp) lap-label
    (let* ((bb (comp-block-name (comp-bb-maybe-add
                                 (1+ (comp-limplify-pc comp-pass))
                                 (comp-sp)))) ; Fall through block.
           (target-sp (+ target-offset (comp-sp)))
           (target-addr (comp-label-to-addr label-num))
           (target (comp-bb-maybe-add target-addr target-sp))
           (latch (when (< target-addr (comp-limplify-pc comp-pass))
                    (comp-latch-make-fill target)))
           (eff-target-name (comp-block-name (or latch target))))
      (when label-sp
        (cl-assert (= (1- label-sp) (+ target-offset (comp-sp)))))
      (comp-emit (if negated
		     (list 'cond-jump a b eff-target-name bb)
		   (list 'cond-jump a b bb eff-target-name)))
      (comp-mark-curr-bb-closed)
      bb)))

(defun comp-emit-handler (lap-label handler-type)
  "Emit a non local exit handler to LAP-LABEL of type HANDLER-TYPE."
  (cl-destructuring-bind (label-num . label-sp) lap-label
    (cl-assert (= (- label-sp 2) (comp-sp)))
    (setf (comp-func-has-non-local comp-func) t)
    (let* ((guarded-bb (comp-bb-maybe-add (1+ (comp-limplify-pc comp-pass))
                                          (comp-sp)))
           (handler-bb (comp-bb-maybe-add (comp-label-to-addr label-num)
                                          (1+ (comp-sp))))
           (pop-bb (make--comp-block-lap nil (comp-sp) (comp-new-block-sym))))
      (comp-emit (list 'push-handler
                       handler-type
                       (comp-slot+1)
                       (comp-block-name pop-bb)
                       (comp-block-name guarded-bb)))
      (comp-mark-curr-bb-closed)
      ;; Emit the basic block to pop the handler if we got the non local.
      (puthash (comp-block-name pop-bb) pop-bb (comp-func-blocks comp-func))
      (setf (comp-limplify-curr-block comp-pass) pop-bb)
      (comp-emit `(fetch-handler ,(comp-slot+1)))
      (comp-emit `(jump ,(comp-block-name handler-bb)))
      (comp-mark-curr-bb-closed))))

(defun comp-limplify-listn (n)
  "Limplify list N."
  (comp-with-sp (+ (comp-sp) n -1)
    (comp-emit-set-call (comp-call 'cons
                                   (comp-slot)
                                   (make-comp-mvar :constant nil))))
  (cl-loop for sp from (+ (comp-sp) n -2) downto (comp-sp)
           do (comp-with-sp sp
                (comp-emit-set-call (comp-call 'cons
                                               (comp-slot)
                                               (comp-slot+1))))))

(defun comp-new-block-sym (&optional postfix)
  "Return a unique symbol postfixing POSTFIX naming the next new basic block."
  (intern (format (if postfix "bb_%s_%s" "bb_%s")
                  (funcall (comp-func-block-cnt-gen comp-func))
                  postfix)))

(defun comp-fill-label-h ()
  "Fill label-to-addr hash table for the current function."
  (setf (comp-limplify-label-to-addr comp-pass) (make-hash-table :test 'eql))
  (cl-loop for insn in (comp-func-lap comp-func)
           for addr from 0
           do (pcase insn
                (`(TAG ,label . ,_)
                 (puthash label addr (comp-limplify-label-to-addr comp-pass))))))

(defun comp-jump-table-optimizable (jmp-table)
  "Return t if JMP-TABLE can be optimized out."
  (cl-loop
   with labels = (cl-loop for target-label being each hash-value of jmp-table
                          collect target-label)
   with x = (car labels)
   for l in (cdr-safe labels)
   unless (= l x)
     return nil
   finally return t))

(defun comp-emit-switch (var last-insn)
  "Emit a limple for a lap jump table given VAR and LAST-INSN."
  ;; FIXME this not efficient for big jump tables. We should have a second
  ;; strategy for this case.
  (pcase last-insn
    (`(setimm ,_ ,jmp-table)
     (unless (comp-jump-table-optimizable jmp-table)
       (cl-loop
        for test being each hash-keys of jmp-table
        using (hash-value target-label)
        with len = (hash-table-count jmp-table)
        with test-func = (hash-table-test jmp-table)
        for n from 1
        for last = (= n len)
        for m-test = (make-comp-mvar :constant test)
        for target-name = (comp-block-name (comp-bb-maybe-add
                                            (comp-label-to-addr target-label)
                                            (comp-sp)))
        for ff-bb = (if last
                        (comp-bb-maybe-add (1+ (comp-limplify-pc comp-pass))
                                           (comp-sp))
                      (make--comp-block-lap nil
                                            (comp-sp)
                                            (comp-new-block-sym)))
        for ff-bb-name = (comp-block-name ff-bb)
        if (eq test-func 'eq)
          do (comp-emit (list 'cond-jump var m-test ff-bb-name target-name))
        else
        ;; Store the result of the comparison into the scratch slot before
        ;; emitting the conditional jump.
          do (comp-emit (list 'set (make-comp-mvar :slot 'scratch)
                              (comp-call test-func var m-test)))
             (comp-emit (list 'cond-jump
                              (make-comp-mvar :slot 'scratch)
                              (make-comp-mvar :constant nil)
                              target-name ff-bb-name))
        unless last
        ;; All fall through are artificially created here except the last one.
          do (puthash ff-bb-name ff-bb (comp-func-blocks comp-func))
             (setf (comp-limplify-curr-block comp-pass) ff-bb))))
    (_ (signal 'native-ice
               "missing previous setimm while creating a switch"))))

(defun comp-emit-set-call-subr (subr-name sp-delta)
    "Emit a call for SUBR-NAME.
SP-DELTA is the stack adjustment."
    (let ((subr (symbol-function subr-name))
          (nargs (1+ (- sp-delta))))
      (unless (subrp subr)
        (signal 'native-ice (list "not a subr" subr)))
      (let* ((arity (subr-arity subr))
             (minarg (car arity))
             (maxarg (cdr arity)))
        (when (eq maxarg 'unevalled)
          (signal 'native-ice (list "subr contains  unevalled args" subr-name)))
        (if (eq maxarg 'many)
            ;; callref case.
            (comp-emit-set-call (comp-callref subr-name nargs (comp-sp)))
          ;; Normal call.
          (unless (and (>= maxarg nargs) (<= minarg nargs))
            (signal 'native-ice
                    (list "incoherent stack adjustment" nargs maxarg minarg)))
          (let* ((subr-name subr-name)
                 (slots (cl-loop for i from 0 below maxarg
                                 collect (comp-slot-n (+ i (comp-sp))))))
            (comp-emit-set-call (apply #'comp-call (cons subr-name slots))))))))

(eval-when-compile
  (defun comp-op-to-fun (x)
    "Given the LAP op strip \"byte-\" to have the subr name."
    (intern (replace-regexp-in-string "byte-" "" x)))

  (defun comp-body-eff (body op-name sp-delta)
    "Given the original body BODY compute the effective one.
When BODY is auto guess function name form the LAP byte-code
name.  Otherwise expect lname fnname."
    (pcase (car body)
      ('auto
       `((comp-emit-set-call-subr ',(comp-op-to-fun op-name) ,sp-delta)))
      ((pred symbolp)
       `((comp-emit-set-call-subr ',(car body) ,sp-delta)))
      (_ body))))

(defmacro comp-op-case (&rest cases)
  "Expand CASES into the corresponding `pcase' expansion.
This is responsible for generating the proper stack adjustment when known and
the annotation emission."
  (declare (debug (body))
           (indent defun))
  `(pcase op
     ,@(cl-loop for (op . body) in cases
		for sp-delta = (gethash op comp-op-stack-info)
                for op-name = (symbol-name op)
		if body
		collect `(',op
                          ;; Log all LAP ops except the TAG one.
                          ,(unless (eq op 'TAG)
                             `(comp-emit-annotation
                               ,(concat "LAP op " op-name)))
                          ;; Emit the stack adjustment if present.
                          ,(when (and sp-delta (not (eq 0 sp-delta)))
			     `(cl-incf (comp-sp) ,sp-delta))
                          ,@(comp-body-eff body op-name sp-delta))
                else
		collect `(',op (signal 'native-ice
                                       (list "unsupported LAP op" ',op-name))))
     (_ (signal 'native-ice (list "unexpected LAP op" (symbol-name op))))))

(defun comp-limplify-lap-inst (insn)
  "Limplify LAP instruction INSN pushing it in the proper basic block."
  (let ((op (car insn))
        (arg (if (consp (cdr insn))
                 (cadr insn)
               (cdr insn))))
    (comp-op-case
      (TAG
       (cl-destructuring-bind (_TAG label-num . label-sp) insn
         ;; Paranoid?
         (when label-sp
           (cl-assert (= (1- label-sp) (comp-limplify-sp comp-pass))))
         (comp-emit-annotation (format "LAP TAG %d" label-num))))
      (byte-stack-ref
       (comp-copy-slot (- (comp-sp) arg 1)))
      (byte-varref
       (comp-emit-set-call (comp-call 'symbol-value (make-comp-mvar
                                                     :constant arg))))
      (byte-varset
       (comp-emit (comp-call 'set_internal
                             (make-comp-mvar :constant arg)
                             (comp-slot+1))))
      (byte-varbind ;; Verify
       (comp-emit (comp-call 'specbind
                             (make-comp-mvar :constant arg)
                             (comp-slot+1))))
      (byte-call
       (cl-incf (comp-sp) (- arg))
       (comp-emit-set-call (comp-callref 'funcall (1+ arg) (comp-sp))))
      (byte-unbind
       (comp-emit (comp-call 'helper_unbind_n
                             (make-comp-mvar :constant arg))))
      (byte-pophandler
       (comp-emit '(pop-handler)))
      (byte-pushconditioncase
       (comp-emit-handler (cddr insn) 'condition-case))
      (byte-pushcatch
       (comp-emit-handler (cddr insn) 'catcher))
      (byte-nth auto)
      (byte-symbolp auto)
      (byte-consp auto)
      (byte-stringp auto)
      (byte-listp auto)
      (byte-eq auto)
      (byte-memq auto)
      (byte-not null)
      (byte-car auto)
      (byte-cdr auto)
      (byte-cons auto)
      (byte-list1
       (comp-limplify-listn 1))
      (byte-list2
       (comp-limplify-listn 2))
      (byte-list3
       (comp-limplify-listn 3))
      (byte-list4
       (comp-limplify-listn 4))
      (byte-length auto)
      (byte-aref auto)
      (byte-aset auto)
      (byte-symbol-value auto)
      (byte-symbol-function auto)
      (byte-set auto)
      (byte-fset auto)
      (byte-get auto)
      (byte-substring auto)
      (byte-concat2
       (comp-emit-set-call (comp-callref 'concat 2 (comp-sp))))
      (byte-concat3
       (comp-emit-set-call (comp-callref 'concat 3 (comp-sp))))
      (byte-concat4
       (comp-emit-set-call (comp-callref 'concat 4 (comp-sp))))
      (byte-sub1 1-)
      (byte-add1 1+)
      (byte-eqlsign =)
      (byte-gtr >)
      (byte-lss <)
      (byte-leq <=)
      (byte-geq >=)
      (byte-diff -)
      (byte-negate
       (comp-emit-set-call (comp-call 'negate (comp-slot))))
      (byte-plus +)
      (byte-max auto)
      (byte-min auto)
      (byte-mult *)
      (byte-point auto)
      (byte-goto-char auto)
      (byte-insert auto)
      (byte-point-max auto)
      (byte-point-min auto)
      (byte-char-after auto)
      (byte-following-char auto)
      (byte-preceding-char preceding-char)
      (byte-current-column auto)
      (byte-indent-to
       (comp-emit-set-call (comp-call 'indent-to
                                      (comp-slot)
                                      (make-comp-mvar :constant nil))))
      (byte-scan-buffer-OBSOLETE)
      (byte-eolp auto)
      (byte-eobp auto)
      (byte-bolp auto)
      (byte-bobp auto)
      (byte-current-buffer auto)
      (byte-set-buffer auto)
      (byte-save-current-buffer
       (comp-emit (comp-call 'record_unwind_current_buffer)))
      (byte-set-mark-OBSOLETE)
      (byte-interactive-p-OBSOLETE)
      (byte-forward-char auto)
      (byte-forward-word auto)
      (byte-skip-chars-forward auto)
      (byte-skip-chars-backward auto)
      (byte-forward-line auto)
      (byte-char-syntax auto)
      (byte-buffer-substring auto)
      (byte-delete-region auto)
      (byte-narrow-to-region
       (comp-emit-set-call (comp-call 'narrow-to-region
                                      (comp-slot)
                                      (comp-slot+1))))
      (byte-widen
       (comp-emit-set-call (comp-call 'widen)))
      (byte-end-of-line auto)
      (byte-constant2) ; TODO
      ;; Branches.
      (byte-goto
       (comp-emit-uncond-jump (cddr insn)))
      (byte-goto-if-nil
       (comp-emit-cond-jump (comp-slot+1) (make-comp-mvar :constant nil) 0
                            (cddr insn) nil))
      (byte-goto-if-not-nil
       (comp-emit-cond-jump (comp-slot+1) (make-comp-mvar :constant nil) 0
                            (cddr insn) t))
      (byte-goto-if-nil-else-pop
       (comp-emit-cond-jump (comp-slot+1) (make-comp-mvar :constant nil) 1
                            (cddr insn) nil))
      (byte-goto-if-not-nil-else-pop
       (comp-emit-cond-jump (comp-slot+1) (make-comp-mvar :constant nil) 1
                            (cddr insn) t))
      (byte-return
       (comp-emit `(return ,(comp-slot+1))))
      (byte-discard 'pass)
      (byte-dup
       (comp-copy-slot (1- (comp-sp))))
      (byte-save-excursion
       (comp-emit (comp-call 'record_unwind_protect_excursion)))
      (byte-save-window-excursion-OBSOLETE)
      (byte-save-restriction
       (comp-emit (comp-call 'helper_save_restriction)))
      (byte-catch) ;; Obsolete
      (byte-unwind-protect
       (comp-emit (comp-call 'helper_unwind_protect (comp-slot+1))))
      (byte-condition-case) ;; Obsolete
      (byte-temp-output-buffer-setup-OBSOLETE)
      (byte-temp-output-buffer-show-OBSOLETE)
      (byte-unbind-all) ;; Obsolete
      (byte-set-marker auto)
      (byte-match-beginning auto)
      (byte-match-end auto)
      (byte-upcase auto)
      (byte-downcase auto)
      (byte-string= string-equal)
      (byte-string< string-lessp)
      (byte-equal auto)
      (byte-nthcdr auto)
      (byte-elt auto)
      (byte-member auto)
      (byte-assq auto)
      (byte-nreverse auto)
      (byte-setcar auto)
      (byte-setcdr auto)
      (byte-car-safe auto)
      (byte-cdr-safe auto)
      (byte-nconc auto)
      (byte-quo /)
      (byte-rem %)
      (byte-numberp auto)
      (byte-integerp auto)
      (byte-listN
       (cl-incf (comp-sp) (- 1 arg))
       (comp-emit-set-call (comp-callref 'list arg (comp-sp))))
      (byte-concatN
       (cl-incf (comp-sp) (- 1 arg))
       (comp-emit-set-call (comp-callref 'concat arg (comp-sp))))
      (byte-insertN
       (cl-incf (comp-sp) (- 1 arg))
       (comp-emit-set-call (comp-callref 'insert arg (comp-sp))))
      (byte-stack-set
       (comp-copy-slot (1+ (comp-sp)) (- (comp-sp) arg -1)))
      (byte-stack-set2 (cl-assert nil)) ;; TODO
      (byte-discardN
       (cl-incf (comp-sp) (- arg)))
      (byte-switch
       ;; Assume to follow the emission of a setimm.
       ;; This is checked into comp-emit-switch.
       (comp-emit-switch (comp-slot+1)
                         (cl-second (comp-block-insns
                                     (comp-limplify-curr-block comp-pass)))))
      (byte-constant
       (comp-emit-setimm arg))
      (byte-discardN-preserve-tos
       (cl-incf (comp-sp) (- arg))
       (comp-copy-slot (+ arg (comp-sp)))))))

(defun comp-emit-narg-prologue (minarg nonrest rest)
  "Emit the prologue for a narg function."
  (cl-loop for i below minarg
           do (comp-emit `(set-args-to-local ,(comp-slot-n i)))
              (comp-emit '(inc-args)))
  (cl-loop for i from minarg below nonrest
           for bb = (intern (format "entry_%s" i))
           for fallback = (intern (format "entry_fallback_%s" i))
           do (comp-emit `(cond-jump-narg-leq ,i ,bb ,fallback))
              (comp-make-curr-block bb (comp-sp))
              (comp-emit `(set-args-to-local ,(comp-slot-n i)))
              (comp-emit '(inc-args))
              finally (comp-emit '(jump entry_rest_args)))
  (when (not (= minarg nonrest))
    (cl-loop for i from minarg below nonrest
             for bb = (intern (format "entry_fallback_%s" i))
             for next-bb = (if (= (1+ i) nonrest)
                               'entry_rest_args
                             (intern (format "entry_fallback_%s" (1+ i))))
             do (comp-with-sp i
                  (comp-make-curr-block bb (comp-sp))
                  (comp-emit-setimm nil)
                  (comp-emit `(jump ,next-bb)))))
  (comp-make-curr-block 'entry_rest_args (comp-sp))
  (comp-emit `(set-rest-args-to-local ,(comp-slot-n nonrest)))
  (setf (comp-sp) nonrest)
  (when (and (> nonrest 8) (null rest))
    (cl-decf (comp-sp))))

(defun comp-limplify-finalize-function (func)
  "Reverse insns into all basic blocks of FUNC."
  (cl-loop for bb being the hash-value in (comp-func-blocks func)
           do (setf (comp-block-insns bb)
                    (nreverse (comp-block-insns bb))))
  (comp-log-func func 2)
  func)

(cl-defgeneric comp-prepare-args-for-top-level (function)
  "Given FUNCTION return the two args arguments for comp--register-...")

(cl-defmethod comp-prepare-args-for-top-level ((function comp-func-l))
  "Lexical scoped FUNCTION."
  (let ((args (comp-func-l-args function)))
    (cons (make-comp-mvar :constant (comp-args-base-min args))
          (make-comp-mvar :constant (if (comp-args-p args)
                                        (comp-args-max args)
                                      'many)))))

(cl-defmethod comp-prepare-args-for-top-level ((function comp-func-d))
  "Dynamic scoped FUNCTION."
  (cons (make-comp-mvar :constant (func-arity (comp-func-byte-func function)))
        (let ((comp-curr-allocation-class 'd-default))
          ;; Lambda-lists must stay in the same relocation class of
          ;; the object referenced by code to respect uninterned
          ;; symbols.
          (make-comp-mvar :constant (comp-func-d-lambda-list function)))))

(cl-defgeneric comp-emit-for-top-level (form for-late-load)
  "Emit the limple code for top level FORM.")

(cl-defmethod comp-emit-for-top-level ((form byte-to-native-func-def)
                                       for-late-load)
  (let* ((name (byte-to-native-func-def-name form))
         (c-name (byte-to-native-func-def-c-name form))
         (f (gethash c-name (comp-ctxt-funcs-h comp-ctxt)))
         (args (comp-prepare-args-for-top-level f)))
    (cl-assert (and name f))
    (comp-emit (comp-call (if for-late-load
                              'comp--late-register-subr
                            'comp--register-subr)
                          (make-comp-mvar :constant name)
                          (car args)
                          (cdr args)
                          (make-comp-mvar :constant c-name)
                          (make-comp-mvar
                           :constant
                           (let* ((h (comp-ctxt-function-docs comp-ctxt))
                                  (i (hash-table-count h)))
                             (puthash i (comp-func-doc f) h)
                             i))
                          (make-comp-mvar :constant
                                          (comp-func-int-spec f))
                          ;; This is the compilation unit it-self passed as
                          ;; parameter.
                          (make-comp-mvar :slot 0)))))

(cl-defmethod comp-emit-for-top-level ((form byte-to-native-top-level)
                                       for-late-load)
  (unless for-late-load
    (comp-emit
     (comp-call 'eval
                (let ((comp-curr-allocation-class 'd-impure))
                  (make-comp-mvar :constant
                                  (byte-to-native-top-level-form form)))
                (make-comp-mvar :constant
                                (byte-to-native-top-level-lexical form))))))

(defun comp-emit-lambda-for-top-level (func)
  "Emit the creation of subrs for lambda FUNC.
These are stored in the reloc data array."
  (let ((args (comp-prepare-args-for-top-level func)))
    (let ((comp-curr-allocation-class 'd-impure))
      (comp-add-const-to-relocs (comp-func-byte-func func)))
    (comp-emit
     (comp-call 'comp--register-lambda
                ;; mvar to be fixed-up when containers are
                ;; finalized.
                (or (gethash (comp-func-byte-func func)
                             (comp-ctxt-lambda-fixups-h comp-ctxt))
                    (puthash (comp-func-byte-func func)
                             (make-comp-mvar :constant nil)
                             (comp-ctxt-lambda-fixups-h comp-ctxt)))
                (car args)
                (cdr args)
                (make-comp-mvar :constant (comp-func-c-name func))
                (make-comp-mvar
                 :constant (let* ((h (comp-ctxt-function-docs comp-ctxt))
                                  (i (hash-table-count h)))
                             (puthash i (comp-func-doc func) h)
                             i))
                (make-comp-mvar :constant (comp-func-int-spec func))
                ;; This is the compilation unit it-self passed as
                ;; parameter.
                (make-comp-mvar :slot 0)))))

(defun comp-limplify-top-level (for-late-load)
  "Create a limple function to modify the global environment at load.
When FOR-LATE-LOAD is non-nil the emitted function modifies only
function definition.

Synthesize a function called 'top_level_run' that gets one single
parameter (the compilation unit it-self).  To define native
functions 'top_level_run' will call back `comp--register-subr'
into the C code forwarding the compilation unit."
  ;; Once an .eln is loaded and Emacs is dumped 'top_level_run' has no
  ;; reasons to be execute ever again.  Therefore all objects can be
  ;; just ephemeral.
  (let* ((comp-curr-allocation-class 'd-ephemeral)
         (func (make-comp-func-l :name (if for-late-load
                                           'late-top-level-run
                                         'top-level-run)
                                 :c-name (if for-late-load
                                             "late_top_level_run"
                                           "top_level_run")
                                 :args (make-comp-args :min 1 :max 1)
                                 :frame-size 1
                                 :speed comp-speed))
         (comp-func func)
         (comp-pass (make-comp-limplify
                     :curr-block (make--comp-block-lap -1 0 'top-level)
                     :frame (comp-new-frame 1))))
    (comp-make-curr-block 'entry (comp-sp))
    (comp-emit-annotation (if for-late-load
                              "Late top level"
                            "Top level"))
    ;; Assign the compilation unit incoming as parameter to the slot frame 0.
    (comp-emit `(set-par-to-local ,(comp-slot-n 0) 0))
    (maphash (lambda (_ func)
               (comp-emit-lambda-for-top-level func))
             (comp-ctxt-byte-func-to-func-h comp-ctxt))
    (mapc (lambda (x) (comp-emit-for-top-level x for-late-load))
          (comp-ctxt-top-level-forms comp-ctxt))
    (comp-emit `(return ,(make-comp-mvar :constant t)))
    (puthash 0 (comp-func-frame-size func) (comp-func-array-h func))
    (comp-limplify-finalize-function func)))

(defun comp-addr-to-bb-name (addr)
  "Search for a block starting at ADDR into pending or limplified blocks."
  ;; FIXME Actually we could have another hash for this.
  (cl-flet ((pred (bb)
              (equal (comp-block-lap-addr bb) addr)))
    (if-let ((pending (cl-find-if #'pred
                                  (comp-limplify-pending-blocks comp-pass))))
        (comp-block-name pending)
      (cl-loop for bb being the hash-value in (comp-func-blocks comp-func)
               when (pred bb)
                 return (comp-block-name bb)))))

(defun comp-limplify-block (bb)
  "Limplify basic-block BB and add it to the current function."
  (setf (comp-limplify-curr-block comp-pass) bb
        (comp-limplify-sp comp-pass) (comp-block-lap-sp bb)
        (comp-limplify-pc comp-pass) (comp-block-lap-addr bb))
  (puthash (comp-block-name bb) bb (comp-func-blocks comp-func))
  (cl-loop
   for inst-cell on (nthcdr (comp-limplify-pc comp-pass)
                            (comp-func-lap comp-func))
   for inst = (car inst-cell)
   for next-inst = (car-safe (cdr inst-cell))
   do (comp-limplify-lap-inst inst)
      (cl-incf (comp-limplify-pc comp-pass))
   when (comp-lap-fall-through-p inst)
   do (pcase next-inst
        (`(TAG ,_label . ,label-sp)
         (when label-sp
           (cl-assert (= (1- label-sp) (comp-sp))))
         (let* ((stack-depth (if label-sp
                                 (1- label-sp)
                               (comp-sp)))
                (next-bb (comp-block-name (comp-bb-maybe-add
                                           (comp-limplify-pc comp-pass)
                                           stack-depth))))
           (unless (comp-block-closed bb)
             (comp-emit `(jump ,next-bb))))
         (cl-return)))
   until (comp-lap-eob-p inst)))

(defun comp-limplify-function (func)
  "Limplify a single function FUNC."
  (let* ((frame-size (comp-func-frame-size func))
         (comp-func func)
         (comp-pass (make-comp-limplify
                     :frame (comp-new-frame frame-size))))
    (comp-fill-label-h)
    ;; Prologue
    (comp-make-curr-block 'entry (comp-sp))
    (comp-emit-annotation (concat "Lisp function: "
                                  (symbol-name (comp-func-name func))))
    ;; Dynamic functions have parameters bound by the trampoline.
    (when (comp-func-l-p func)
      (let ((args (comp-func-l-args func)))
        (if (comp-args-p args)
            (cl-loop for i below (comp-args-max args)
                     do (cl-incf (comp-sp))
                        (comp-emit `(set-par-to-local ,(comp-slot) ,i)))
          (comp-emit-narg-prologue (comp-args-base-min args)
                                   (comp-nargs-nonrest args)
                                   (comp-nargs-rest args)))))
    (comp-emit '(jump bb_0))
    ;; Body
    (comp-bb-maybe-add 0 (comp-sp))
    (cl-loop for next-bb = (pop (comp-limplify-pending-blocks comp-pass))
             while next-bb
             do (comp-limplify-block next-bb))
    ;; Sanity check against block duplication.
    (cl-loop with addr-h = (make-hash-table)
             for bb being the hash-value in (comp-func-blocks func)
             for addr = (when (comp-block-lap-p bb)
                          (comp-block-lap-addr bb))
             when addr
               do (cl-assert (null (gethash addr addr-h)))
                  (puthash addr t addr-h))
    (comp-limplify-finalize-function func)))

(defun comp-limplify (_)
  "Compute LIMPLE IR for forms in `comp-ctxt'."
  (maphash (lambda (_ f) (comp-limplify-function f))
           (comp-ctxt-funcs-h comp-ctxt))
  (comp-add-func-to-ctxt (comp-limplify-top-level nil))
  (when (comp-ctxt-with-late-load comp-ctxt)
    (comp-add-func-to-ctxt (comp-limplify-top-level t))))

\f
;;; pure-func pass specific code.

;; Simple IPA pass to infer function purity of functions not
;; explicitly declared as such.  This is effective only at speed 3 to
;; avoid optimizing-out functions and preventing their redefinition
;; being effective.

(defun comp-collect-calls (f)
  "Return a list with all the functions called by F."
  (cl-loop
   with h = (make-hash-table :test #'eq)
   for b being each hash-value of (comp-func-blocks f)
   do (cl-loop
       for insn in (comp-block-insns b)
       do (pcase insn
            (`(set ,_lval (,(pred comp-call-op-p) ,f . ,_rest))
             (puthash f t h))
            (`(,(pred comp-call-op-p) ,f . ,_rest)
             (puthash f t h))))
   finally return (cl-loop
                   for f being each hash-key of h
                   collect (if (stringp f)
                               (comp-func-name
                                (gethash f
                                         (comp-ctxt-funcs-h comp-ctxt)))
                             f))))

(defun comp-pure-infer-func (f)
  "If all funtions called by F are pure then F is pure too."
  (when (and (cl-every (lambda (x)
                         (or (comp-function-pure-p x)
                             (eq x (comp-func-name f))))
                       (comp-collect-calls f))
             (not (eq (comp-func-pure f) t)))
    (comp-log (format "%s inferred to be pure" (comp-func-name f)))
    (setf (comp-func-pure f) t)))

(defun comp-ipa-pure (_)
  "Infer function purity."
  (cl-loop
   with pure-n = 0
   for n from 1
   while
   (/= pure-n
       (setf pure-n
             (cl-loop
              for f being each hash-value of (comp-ctxt-funcs-h comp-ctxt)
              when (and (>= (comp-func-speed f) 3)
                        (comp-func-l-p f)
                        (not (comp-func-pure f)))
              do (comp-pure-infer-func f)
              count (comp-func-pure f))))
   finally (comp-log (format "ipa-pure iterated %d times" n))))

\f
;;; SSA pass specific code.
;; After limplification no edges are present between basic blocks and an
;; implicit phi is present for every slot at the beginning of every basic block.
;; This pass is responsible for building all the edges and replace all m-vars
;; plus placing the needed phis.
;; Because the number of phis placed is (supposed) to be the minimum necessary
;; this form is called 'minimal SSA form'.
;; This pass should be run every time basic blocks or m-var are shuffled.

(cl-defun make-comp-ssa-mvar (&key slot (constant nil const-vld) type)
  (let ((mvar (make--comp-mvar :slot slot
                               :const-vld const-vld
                               :constant constant
                               :type type)))
    (setf (comp-mvar-id mvar) (sxhash-eq mvar))
    mvar))

(defun comp-clean-ssa (f)
  "Clean-up SSA for funtion F."
  (setf (comp-func-edges f) ())
  (cl-loop
   for b being each hash-value of (comp-func-blocks f)
   do (setf (comp-block-in-edges b) ()
            (comp-block-out-edges b) ()
            (comp-block-dom b) nil
            (comp-block-df b) (make-hash-table)
            (comp-block-post-num b) nil
            (comp-block-final-frame b) nil
            ;; Prune all phis.
            (comp-block-insns b) (cl-loop for insn in (comp-block-insns b)
                                          unless (eq 'phi (car insn))
                                            collect insn))))

(defun comp-compute-edges ()
  "Compute the basic block edges for the current function."
  (cl-flet ((edge-add (&rest args)
              (push
               (apply #'make--comp-edge
                      :number (funcall (comp-func-edge-cnt-gen comp-func))
                      args)
               (comp-func-edges comp-func))))

    (cl-loop with blocks = (comp-func-blocks comp-func)
             for bb being each hash-value of blocks
             for last-insn = (car (last (comp-block-insns bb)))
             for (op first second third forth) = last-insn
             do (cl-case op
                  (jump
                   (edge-add :src bb :dst (gethash first blocks)))
                  (cond-jump
                   (edge-add :src bb :dst (gethash third blocks))
                   (edge-add :src bb :dst (gethash forth blocks)))
                  (cond-jump-narg-leq
                   (edge-add :src bb :dst (gethash second blocks))
                   (edge-add :src bb :dst (gethash third blocks)))
                  (push-handler
                   (edge-add :src bb :dst (gethash third blocks))
                   (edge-add :src bb :dst (gethash forth blocks)))
                  (return)
                  (otherwise
                   (signal 'native-ice
                           (list "block does not end with a branch"
                                 bb
                                 (comp-func-name comp-func)))))
             finally
             (setf (comp-func-edges comp-func)
                   (nreverse (comp-func-edges comp-func)))
             ;; Update edge refs into blocks.
             (cl-loop
              for edge in (comp-func-edges comp-func)
              do
              (push edge
                    (comp-block-out-edges (comp-edge-src edge)))
              (push edge
                    (comp-block-in-edges (comp-edge-dst edge))))
                     (comp-log-edges comp-func))))

(defun comp-collect-rev-post-order (basic-block)
  "Walk BASIC-BLOCK children and return their name in reversed post-order."
  (let ((visited (make-hash-table))
        (acc ()))
    (cl-labels ((collect-rec (bb)
                  (let ((name (comp-block-name bb)))
                    (unless (gethash name visited)
                      (puthash name t visited)
                      (cl-loop for e in (comp-block-out-edges bb)
                               for dst-block = (comp-edge-dst e)
                               do (collect-rec dst-block))
                      (push name acc)))))
      (collect-rec basic-block)
      acc)))

(defun comp-compute-dominator-tree ()
  "Compute immediate dominators for each basic block in current function."
  ;; Originally based on: "A Simple, Fast Dominance Algorithm"
  ;; Cooper, Keith D.; Harvey, Timothy J.; Kennedy, Ken (2001).
  (cl-flet ((intersect (b1 b2)
              (let ((finger1 (comp-block-post-num b1))
                    (finger2 (comp-block-post-num b2)))
                (while (not (= finger1 finger2))
                  (while (< finger1 finger2)
                    (setf b1 (comp-block-dom b1)
                          finger1 (comp-block-post-num b1)))
                  (while (< finger2 finger1)
                    (setf b2 (comp-block-dom b2)
                          finger2 (comp-block-post-num b2))))
                b1))
            (first-processed (l)
              (if-let ((p (cl-find-if (lambda (p) (comp-block-dom p)) l)))
                  p
                (signal 'native-ice "cant't find first preprocessed"))))

    (when-let ((blocks (comp-func-blocks comp-func))
               (entry (gethash 'entry blocks))
               ;; No point to go on if the only bb is 'entry'.
               (bb1 (gethash 'bb_1 blocks)))
      (cl-loop with rev-bb-list = (comp-collect-rev-post-order entry)
               with changed = t
               while changed
               initially (progn
                           (comp-log "Computing dominator tree...\n" 2)
                           (setf (comp-block-dom entry) entry)
                           ;; Set the post order number.
                           (cl-loop for name in (reverse rev-bb-list)
                                    for b = (gethash name blocks)
                                    for i from 0
                                    do (setf (comp-block-post-num b) i)))
               do (cl-loop
                   for name in (cdr rev-bb-list)
                   for b = (gethash name blocks)
                   for preds = (comp-block-preds b)
                   for new-idom = (first-processed preds)
                   initially (setf changed nil)
                   do (cl-loop for p in (delq new-idom preds)
                               when (comp-block-dom p)
                                 do (setf new-idom (intersect p new-idom)))
                   unless (eq (comp-block-dom b) new-idom)
                   do (setf (comp-block-dom b) new-idom
                            changed t))))))

(defun comp-compute-dominator-frontiers ()
  "Compute the dominator frontier for each basic block in `comp-func'."
  ;; Originally based on: "A Simple, Fast Dominance Algorithm"
  ;; Cooper, Keith D.; Harvey, Timothy J.; Kennedy, Ken (2001).
  (cl-loop with blocks = (comp-func-blocks comp-func)
           for b-name being each hash-keys of blocks
           using (hash-value b)
           for preds = (comp-block-preds b)
           when (>= (length preds) 2) ; All joins
           do (cl-loop for p in preds
                       for runner = p
                       do (while (not (eq runner (comp-block-dom b)))
                            (puthash b-name b (comp-block-df runner))
                            (setf runner (comp-block-dom runner))))))

(defun comp-log-block-info ()
  "Log basic blocks info for the current function."
  (maphash (lambda (name bb)
             (let ((dom (comp-block-dom bb))
                   (df (comp-block-df bb)))
               (comp-log (format "block: %s idom: %s DF %s\n"
                                 name
                                 (when dom (comp-block-name dom))
                                 (cl-loop for b being each hash-keys of df
                                          collect b))
                         3)))
           (comp-func-blocks comp-func)))

(defun comp-place-phis ()
  "Place phi insns into the current function."
  ;; Originally based on: Static Single Assignment Book
  ;; Algorithm 3.1: Standard algorithm for inserting phi-functions
  (cl-flet ((add-phi (slot-n bb)
             ;; Add a phi func for slot SLOT-N at the top of BB.
             (push `(phi ,slot-n) (comp-block-insns bb)))
            (slot-assigned-p (slot-n bb)
             ;; Return t if a SLOT-N was assigned within BB.
             (cl-loop for insn in (comp-block-insns bb)
                      for op = (car insn)
                      when (or (and (comp-assign-op-p op)
                                    (eql slot-n (comp-mvar-slot (cadr insn))))
                               ;; fetch-handler is after a non local
                               ;; therefore clobbers all frame!!!
                               (eq op 'fetch-handler))
                        return t)))

    (cl-loop for i from 0 below (comp-func-frame-size comp-func)
             ;; List of blocks with a definition of mvar i
             for defs-v = (cl-loop with blocks = (comp-func-blocks comp-func)
                                    for b being each hash-value of blocks
                                    when (slot-assigned-p i b)
                                    collect b)
             ;; Set of basic blocks where phi is added.
             for f = ()
             ;; Worklist, set of basic blocks that contain definitions of v.
             for w = defs-v
             do
             (while w
               (let ((x (pop w)))
                 (cl-loop for y being each hash-value of (comp-block-df x)
                          unless (cl-find y f)
                          do (add-phi i y)
                             (push y f)
                             ;; Adding a phi implies mentioning the
                             ;; corresponding slot so in case adjust w.
                             (unless (cl-find y defs-v)
                               (push y w))))))))

(defun comp-dom-tree-walker (bb pre-lambda post-lambda)
  "Dominator tree walker function starting from basic block BB.
PRE-LAMBDA and POST-LAMBDA are called in pre or post-order if non-nil."
  (when pre-lambda
    (funcall pre-lambda bb))
  (when-let ((out-edges (comp-block-out-edges bb)))
    (cl-loop for ed in out-edges
             for child = (comp-edge-dst ed)
             when (eq bb (comp-block-dom child))
             ;; Current block is the immediate dominator then recur.
             do (comp-dom-tree-walker child pre-lambda post-lambda)))
  (when post-lambda
    (funcall post-lambda bb)))

(cl-defstruct (comp-ssa (:copier nil))
  "Support structure used while SSA renaming."
  (frame (comp-new-frame (comp-func-frame-size comp-func) t) :type vector
         :documentation "Vector of m-vars."))

(defun comp-ssa-rename-insn (insn frame)
  (dotimes (slot-n (comp-func-frame-size comp-func))
    (cl-flet ((targetp (x)
                ;; Ret t if x is an mvar and target the correct slot number.
                (and (comp-mvar-p x)
                     (eql slot-n (comp-mvar-slot x))))
              (new-lvalue ()
                ;; If is an assignment make a new mvar and put it as l-value.
                (let ((mvar (make-comp-ssa-mvar :slot slot-n)))
                  (setf (aref frame slot-n) mvar
                        (cadr insn) mvar))))
      (pcase insn
        (`(,(pred comp-assign-op-p) ,(pred targetp) . ,_)
         (let ((mvar (aref frame slot-n)))
           (setcdr insn (cl-nsubst-if mvar #'targetp (cdr insn))))
         (new-lvalue))
        (`(fetch-handler . ,_)
         ;; Clobber all no matter what!
         (setf (aref frame slot-n) (make-comp-ssa-mvar :slot slot-n)))
        (`(phi  ,n)
         (when (equal n slot-n)
           (new-lvalue)))
        (_
         (let ((mvar (aref frame slot-n)))
           (setcdr insn (cl-nsubst-if mvar #'targetp (cdr insn)))))))))

(defun comp-ssa-rename ()
  "Entry point to rename into SSA within the current function."
  (comp-log "Renaming\n" 2)
  (let ((frame-size (comp-func-frame-size comp-func))
        (visited (make-hash-table)))
    (cl-labels ((ssa-rename-rec (bb in-frame)
                  (unless (gethash bb visited)
                    (puthash bb t visited)
                    (cl-loop for insn in (comp-block-insns bb)
                             do (comp-ssa-rename-insn insn in-frame))
                    (setf (comp-block-final-frame bb)
                          (copy-sequence in-frame))
                    (when-let ((out-edges (comp-block-out-edges bb)))
                      (cl-loop
                       for ed in out-edges
                       for child = (comp-edge-dst ed)
                       ;; Provide a copy of the same frame to all children.
                       do (ssa-rename-rec child (copy-sequence in-frame)))))))

      (ssa-rename-rec (gethash 'entry (comp-func-blocks comp-func))
                      (comp-new-frame frame-size t)))))

(defun comp-finalize-phis ()
  "Fixup r-values into phis in all basic blocks."
  (cl-flet ((finalize-phi (args b)
              ;; Concatenate into args all incoming m-vars for this phi.
              (setcdr args
                      (cl-loop with slot-n = (comp-mvar-slot (car args))
                               for e in (comp-block-in-edges b)
                               for b = (comp-edge-src e)
                               for in-frame = (comp-block-final-frame b)
                               collect (aref in-frame slot-n)))))

    (cl-loop for b being each hash-value of (comp-func-blocks comp-func)
             do (cl-loop for (op . args) in (comp-block-insns b)
                         when (eq op 'phi)
                           do (finalize-phi args b)))))

(defun comp-ssa ()
  "Port all functions into mininal SSA form."
  (maphash (lambda (_ f)
             (let* ((comp-func f)
                    (ssa-status (comp-func-ssa-status f)))
               (unless (eq ssa-status t)
                 (when (eq ssa-status 'dirty)
                   (comp-clean-ssa f))
                 (comp-compute-edges)
                 (comp-compute-dominator-tree)
                 (comp-compute-dominator-frontiers)
                 (comp-log-block-info)
                 (comp-place-phis)
                 (comp-ssa-rename)
                 (comp-finalize-phis)
                 (comp-log-func comp-func 3)
                 (setf (comp-func-ssa-status f) t))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; propagate pass specific code.
;; A very basic propagation pass follows.
;; This propagates values and types plus ref property in the control flow graph.
;; This is also responsible for removing function calls to pure functions if
;; possible.

(defsubst comp-strict-type-of (obj)
  "Given OBJ return its type understanding fixnums."
  ;; Should be certainly smarter but now we take advantages just from fixnums.
  (if (fixnump obj)
      'fixnum
    (type-of obj)))

(defun comp-copy-insn (insn)
  "Deep copy INSN."
  ;; Adapted from `copy-tree'.
  (if (consp insn)
      (let (result)
	(while (consp insn)
	  (let ((newcar (car insn)))
	    (if (or (consp (car insn)) (comp-mvar-p (car insn)))
		(setf newcar (comp-copy-insn (car insn))))
	    (push newcar result))
	  (setf insn (cdr insn)))
	(nconc (nreverse result)
               (if (comp-mvar-p insn) (comp-copy-insn insn) insn)))
    (if (comp-mvar-p insn)
        (copy-comp-mvar insn)
      insn)))

(defmacro comp-apply-in-env (func &rest args)
  "Apply FUNC to ARGS in the current compilation environment."
  `(let ((env (cl-loop
               for f being the hash-value in (comp-ctxt-funcs-h comp-ctxt)
               for func-name = (comp-func-name f)
               for byte-code = (comp-func-byte-func f)
               when func-name
               collect `(,func-name . ,(symbol-function func-name))
               and do
               (setf (symbol-function func-name) byte-code))))
     (unwind-protect
         (apply ,func ,@args)
       (cl-loop
        for (func-name . def) in env
        do (setf (symbol-function func-name) def)))))

(defun comp-fwprop-prologue ()
  "Prologue for the propagate pass.
Here goes everything that can be done not iteratively (read once).
Forward propagate immediate involed in assignments."
  (cl-loop
   for b being each hash-value of (comp-func-blocks comp-func)
   do (cl-loop
       for insn in (comp-block-insns b)
       do (pcase insn
            (`(setimm ,lval ,v)
             (setf (comp-mvar-const-vld lval) t
                   (comp-mvar-constant lval) v
                   (comp-mvar-type lval) (comp-strict-type-of v)))))))

(defsubst comp-mvar-propagate (lval rval)
  "Propagate into LVAL properties of RVAL."
  (setf (comp-mvar-const-vld lval) (comp-mvar-const-vld rval)
        (comp-mvar-constant lval) (comp-mvar-constant rval)
        (comp-mvar-type lval) (comp-mvar-type rval)))

(defsubst comp-function-optimizable-p (f args)
  "Given function F called with ARGS return non-nil when optimizable."
  (and (cl-every #'comp-mvar-const-vld args)
       (comp-function-pure-p f)))

(defsubst comp-function-call-maybe-remove (insn f args)
  "Given INSN when F is pure if all ARGS are known remove the function call."
  (cl-flet ((rewrite-insn-as-setimm (insn value)
               ;; See `comp-emit-setimm'.
               (comp-add-const-to-relocs value)
               (setf (car insn) 'setimm
                     (cddr insn) `(,value))))
    (cond
     ((eq f 'symbol-value)
      (when-let* ((arg0 (car args))
                  (const (comp-mvar-const-vld arg0))
                  (ok-to-optim (member (comp-mvar-constant arg0)
                                       comp-symbol-values-optimizable)))
        (rewrite-insn-as-setimm insn (symbol-value (comp-mvar-constant
                                                    (car args))))))
     ((comp-function-optimizable-p f args)
      (ignore-errors
        ;; No point to complain here in case of error because we
        ;; should do basic block pruning in order to be sure that this
        ;; is not dead-code.  This is now left to gcc, to be
        ;; implemented only if we want a reliable diagnostic here.
        (let* ((f (if-let (f-in-ctxt (comp-symbol-func-to-fun f))
                      ;; If the function is IN the compilation ctxt
                      ;; and know to be pure.
                      (comp-func-byte-func f-in-ctxt)
                    f))
               (value (comp-apply-in-env f (mapcar #'comp-mvar-constant args))))
          (rewrite-insn-as-setimm insn value)))))))

(defun comp-fwprop-insn (insn)
  "Propagate within INSN."
  (pcase insn
    (`(set ,lval ,rval)
     (pcase rval
       (`(,(or 'call 'callref) ,f . ,args)
        (setf (comp-mvar-type lval)
              (alist-get f comp-known-ret-types))
        (comp-function-call-maybe-remove insn f args))
       (`(,(or 'direct-call 'direct-callref) ,f . ,args)
        (let ((f (comp-func-name (gethash f (comp-ctxt-funcs-h comp-ctxt)))))
          (setf (comp-mvar-type lval)
                (alist-get f comp-known-ret-types))
          (comp-function-call-maybe-remove insn f args)))
       (_
        (comp-mvar-propagate lval rval))))
    (`(setimm ,lval ,v)
     (setf (comp-mvar-const-vld lval) t
           (comp-mvar-constant lval) v
           (comp-mvar-type lval) (comp-strict-type-of v)))
    (`(phi ,lval . ,rest)
     ;; Forward const prop here.
     (when-let* ((vld (cl-every #'comp-mvar-const-vld rest))
                 (consts (mapcar #'comp-mvar-constant rest))
                 (x (car consts))
                 (equals (cl-every (lambda (y) (equal x y)) consts)))
       (setf (comp-mvar-constant lval) x))
     ;; Forward type propagation.
     ;; FIXME: checking for type equality is not sufficient cause does not
     ;; account type hierarchy!
     (when-let* ((types (mapcar #'comp-mvar-type rest))
                 (non-empty (cl-notany #'null types))
                 (x (car types))
                 (eqs (cl-every (lambda (y) (eq x y)) types)))
       (setf (comp-mvar-type lval) x)))))

(defun comp-fwprop* ()
  "Propagate for set* and phi operands.
Return t if something was changed."
  (cl-loop with modified = nil
           for b being each hash-value of (comp-func-blocks comp-func)
           do (cl-loop for insn in (comp-block-insns b)
                       for orig-insn = (unless modified
                                         ;; Save consing after 1th change.
                                         (comp-copy-insn insn))
                       do (comp-fwprop-insn insn)
                       when (and (null modified) (not (equal insn orig-insn)))
                         do (setf modified t))
           finally return modified))

(defun comp-fwprop (_)
  "Forward propagate types and consts within the lattice."
  (comp-ssa)
  (maphash (lambda (_ f)
             (when (and (>= (comp-func-speed f) 2)
                        ;; FIXME remove the following condition when tested.
                        (not (comp-func-has-non-local f)))
               (let ((comp-func f))
                 (comp-fwprop-prologue)
                 (cl-loop
                  for i from 1
                  while (comp-fwprop*)
                  finally (comp-log (format "Propagation run %d times\n" i) 2))
                 (comp-log-func comp-func 3))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; Call optimizer pass specific code.
;; This pass is responsible for the following optimizations:
;; - Call to subrs that are in defined in the C source and are passing through
;;   funcall trampoline gets optimized into normal indirect calls.
;;   This makes effectively this calls equivalent to all the subrs that got
;;   dedicated byte-code ops.
;;   Triggered at comp-speed >= 2.
;; - Recursive calls gets optimized into direct calls.
;;   Triggered at comp-speed >= 2.
;; - Intra compilation unit procedure calls gets optimized into direct calls.
;;   This can be a big win and even allow gcc to inline but does not make
;;   function in the compilation unit re-definable safely without recompiling
;;   the full compilation unit.
;;   For this reason this is triggered only at comp-speed == 3.

(defun comp-func-in-unit (func)
  "Given FUNC return the `comp-fun' definition in the current context.
FUNCTION can be a function-name or byte compiled function."
  (if (symbolp func)
      (comp-symbol-func-to-fun func)
    (cl-assert (byte-code-function-p func))
    (gethash func (comp-ctxt-byte-func-to-func-h comp-ctxt))))

(defun comp-call-optim-form-call (callee args)
  ""
  (cl-flet ((fill-args (args total)
              ;; Fill missing args to reach TOTAL
              (append args (cl-loop repeat (- total (length args))
                                    collect (make-comp-mvar :constant nil)))))
    (when (and callee
               (or (symbolp callee)
                   (gethash callee (comp-ctxt-byte-func-to-func-h comp-ctxt)))
               (not (memq callee comp-never-optimize-functions)))
      (let* ((f (if (symbolp callee)
                    (symbol-function callee)
                  (cl-assert (byte-code-function-p callee))
                  callee))
             (subrp (subrp f))
             (comp-func-callee (comp-func-in-unit callee)))
        (cond
         ((and subrp (not (subr-native-elisp-p f)))
          ;; Trampoline removal.
          (let* ((callee (intern (subr-name f))) ; Fix aliased names.
                 (maxarg (cdr (subr-arity f)))
                 (call-type (if (if subrp
                                    (not (numberp maxarg))
                                  (comp-nargs-p comp-func-callee))
                                'callref
                              'call))
                 (args (if (eq call-type 'callref)
                           args
                         (fill-args args maxarg))))
            `(,call-type ,callee ,@args)))
         ;; Intra compilation unit procedure call optimization.
         ;; Attention speed 3 triggers this for non self calls too!!
         ((and comp-func-callee
               (or (and (>= (comp-func-speed comp-func) 3)
                        (comp-func-unique-in-cu-p callee))
                   (and (>= (comp-func-speed comp-func) 2)
                        ;; Anonymous lambdas can't be redefined so are
                        ;; always safe to optimize.
                        (byte-code-function-p callee))))
          (let* ((func-args (comp-func-l-args comp-func-callee))
                 (nargs (comp-nargs-p func-args))
                 (call-type (if nargs 'direct-callref 'direct-call))
                 (args (if (eq call-type 'direct-callref)
                           args
                         (fill-args args (comp-args-max func-args)))))
            `(,call-type ,(comp-func-c-name comp-func-callee) ,@args)))
         ((comp-type-hint-p callee)
          `(call ,callee ,@args)))))))

(defun comp-call-optim-func ()
  "Perform the trampoline call optimization for the current function."
  (cl-loop
   with self = (comp-func-name comp-func)
   for b being each hash-value of (comp-func-blocks comp-func)
   when self ;; FIXME add proper anonymous lambda support.
   do (comp-loop-insn-in-block b
        (pcase insn
          (`(set ,lval (callref funcall ,f . ,rest))
           (when-let ((new-form (comp-call-optim-form-call
                                 (comp-mvar-constant f) rest)))
             (setf insn `(set ,lval ,new-form))))
          (`(callref funcall ,f . ,rest)
           (when-let ((new-form (comp-call-optim-form-call
                                 (comp-mvar-constant f) rest)))
             (setf insn new-form)))))))

(defun comp-call-optim (_)
  "Try to optimize out funcall trampoline usage when possible."
  (maphash (lambda (_ f)
             (when (and (>= (comp-func-speed f) 2)
                        (comp-func-l-p f))
               (let ((comp-func f))
                 (comp-call-optim-func))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; Dead code elimination pass specific code.
;; This simple pass try to eliminate insns became useful after propagation.
;; Even if gcc would take care of this is good to perform this here
;; in the hope of removing memory references.
;;
;; This pass can be run as last optim.

(defun comp-collect-mvar-ids (insn)
  "Collect the m-var unique identifiers into INSN."
  (cl-loop for x in insn
           if (consp x)
             append (comp-collect-mvar-ids x)
           else
             when (comp-mvar-p x)
               collect (comp-mvar-id x)))

(defun comp-dead-assignments-func ()
  "Clean-up dead assignments into current function.
Return the list of m-var ids nuked."
  (let ((l-vals ())
        (r-vals ()))
    ;; Collect used r and l-values.
    (cl-loop
     for b being each hash-value of (comp-func-blocks comp-func)
     do (cl-loop
         for insn in (comp-block-insns b)
         for (op arg0 . rest) = insn
         if (comp-set-op-p op)
           do (push (comp-mvar-id arg0) l-vals)
              (setf r-vals (nconc (comp-collect-mvar-ids rest) r-vals))
         else
           do (setf r-vals (nconc (comp-collect-mvar-ids insn) r-vals))))
    ;; Every l-value appearing that does not appear as r-value has no right to
    ;; exist and gets nuked.
    (let ((nuke-list (cl-set-difference l-vals r-vals)))
      (comp-log (format "Function %s\nl-vals %s\nr-vals %s\nNuking ids: %s\n"
                        (comp-func-name comp-func)
                        l-vals
                        r-vals
                        nuke-list)
                3)
      (cl-loop
       for b being each hash-value of (comp-func-blocks comp-func)
       do (comp-loop-insn-in-block b
            (cl-destructuring-bind (op &optional arg0 arg1 &rest rest) insn
              (when (and (comp-set-op-p op)
                         (memq (comp-mvar-id arg0) nuke-list))
                (setf insn
                      (if (comp-limple-insn-call-p arg1)
                          arg1
                        `(comment ,(format "optimized out: %s"
                                           insn))))))))
      nuke-list)))

(defun comp-dead-code (_)
  "Dead code elimination."
  (maphash (lambda (_ f)
             (when (and (>= (comp-func-speed f) 2)
                        ;; FIXME remove the following condition when tested.
                        (not (comp-func-has-non-local f)))
               (cl-loop
                for comp-func = f
                for i from 1
                while (comp-dead-assignments-func)
                finally (comp-log (format "dead code rm run %d times\n" i) 2)
                (comp-log-func comp-func 3))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; Tail Call Optimization pass specific code.

(defun comp-form-tco-call-seq (args)
  "Generate a tco sequence for ARGS."
  `(,@(cl-loop for arg in args
               for i from 0
               collect `(set ,(make-comp-mvar :slot i) ,arg))
    (jump bb_0)))

(defun comp-tco-func ()
  "Try to pattern match and perform TCO within the current function."
  (cl-loop
   for b being each hash-value of (comp-func-blocks comp-func)
   do (cl-loop
       named in-the-basic-block
       for insns-seq on (comp-block-insns b)
       do (pcase insns-seq
            (`((set ,l-val (direct-call ,func . ,args))
               (comment ,_comment)
               (return ,ret-val))
             (when (and (string= func (comp-func-c-name comp-func))
                        (eq l-val ret-val))
               (let ((tco-seq (comp-form-tco-call-seq args)))
                 (setf (car insns-seq) (car tco-seq)
                       (cdr insns-seq) (cdr tco-seq)
                       (comp-func-ssa-status comp-func) 'dirty)
                 (cl-return-from in-the-basic-block))))))))

(defun comp-tco (_)
  "Simple peephole pass performing self TCO."
  (maphash (lambda (_ f)
             (when (and (>= (comp-func-speed f) 3)
                        (comp-func-l-p f)
                        (not (comp-func-has-non-local f)))
               (let ((comp-func f))
                 (comp-tco-func)
                 (comp-log-func comp-func 3))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; Type hint removal pass specific code.

;; This must run after all SSA prop not to have the type hint
;; information overwritten.

(defun comp-remove-type-hints-func ()
  "Remove type hints from the current function.
These are substituted with a normal 'set' op."
  (cl-loop
   for b being each hash-value of (comp-func-blocks comp-func)
   do (comp-loop-insn-in-block b
        (pcase insn
          (`(set ,l-val (call ,(pred comp-type-hint-p) ,r-val))
           (setf insn `(set ,l-val ,r-val)))))))

(defun comp-remove-type-hints (_)
  "Dead code elimination."
  (maphash (lambda (_ f)
             (when (>= (comp-func-speed f) 2)
               (let ((comp-func f))
                 (comp-remove-type-hints-func)
                 (comp-log-func comp-func 3))))
           (comp-ctxt-funcs-h comp-ctxt)))

\f
;;; Final pass specific code.

(defun comp-finalize-container (cont)
  "Finalize data container CONT."
  (setf (comp-data-container-l cont)
        (cl-loop with h = (comp-data-container-idx cont)
                 for obj each hash-keys of h
                 for i from 0
                 do (puthash obj i h)
                 ;; Prune byte-code objects coming from lambdas.
                 ;; These are not anymore necessary as they will be
                 ;; replaced at load time by native-elisp-subrs.
                 ;; Note: we leave the objects in the idx hash table
                 ;; to still be able to retrieve the correct index
                 ;; from the corresponding m-var.
                 collect (if (gethash obj
                                      (comp-ctxt-byte-func-to-func-h comp-ctxt))
                             'lambda-fixup
                           obj))))

(defun comp-finalize-relocs ()
  "Finalize data containers for each relocation class.
Remove immediate duplicates within relocation classes.
Update all insn accordingly."
  ;; Symbols imported by C inlined functions.  We do this here because
  ;; is better to add all objs to the relocation containers before we
  ;; compacting them.
  (mapc #'comp-add-const-to-relocs '(nil t consp listp))

  (let* ((d-default (comp-ctxt-d-default comp-ctxt))
         (d-default-idx (comp-data-container-idx d-default))
         (d-impure (comp-ctxt-d-impure comp-ctxt))
         (d-impure-idx (comp-data-container-idx d-impure))
         (d-ephemeral (comp-ctxt-d-ephemeral comp-ctxt))
         (d-ephemeral-idx (comp-data-container-idx d-ephemeral)))
    ;; We never want compiled lambdas ending up in pure space.  A copy must
    ;; be already present in impure (see `comp-emit-lambda-for-top-level').
    (cl-loop for obj being each hash-keys of d-default-idx
             when (gethash obj (comp-ctxt-lambda-fixups-h comp-ctxt))
               do (cl-assert (gethash obj d-impure-idx))
                  (remhash obj d-default-idx))
    ;; Remove entries in d-impure already present in d-default.
    (cl-loop for obj being each hash-keys of d-impure-idx
             when (gethash obj d-default-idx)
               do (remhash obj d-impure-idx))
    ;; Remove entries in d-ephemeral already present in d-default or
    ;; d-impure.
    (cl-loop for obj being each hash-keys of d-ephemeral-idx
             when (or (gethash obj d-default-idx) (gethash obj d-impure-idx))
               do (remhash obj d-ephemeral-idx))
    ;; Fix-up indexes in each relocation class and fill corresponding
    ;; reloc lists.
    (mapc #'comp-finalize-container (list d-default d-impure d-ephemeral))
    ;; Make a vector from the function documentation hash table.
    (cl-loop with h = (comp-ctxt-function-docs comp-ctxt)
             with v = (make-vector (hash-table-count h) nil)
             for idx being each hash-keys of h
             for doc = (gethash idx h)
             do (setf (aref v idx) doc)
             finally
             do (setf (comp-ctxt-function-docs comp-ctxt) v))
    ;; And now we conclude with the following: We need to pass to
    ;; `comp--register-lambda' the index in the impure relocation
    ;; array to store revived lambdas, but given we know it only now
    ;; we fix it up as last.
    (cl-loop for f being each hash-keys of (comp-ctxt-lambda-fixups-h comp-ctxt)
             using (hash-value mvar)
             with reverse-h = (make-hash-table) ;; Make sure idx is unique.
             for idx = (gethash f d-impure-idx)
             do
             (cl-assert (null (gethash idx reverse-h)))
             (cl-assert (fixnump idx))
             (setf (comp-mvar-constant mvar) idx)
             (puthash idx t reverse-h))))

(defun comp-compile-ctxt-to-file (name)
  "Compile as native code the current context naming it NAME.
Prepare every function for final compilation and drive the C back-end."
  (let ((dir (file-name-directory name)))
    (comp-finalize-relocs)
    (maphash (lambda (_ f)
               (comp-log-func f 1))
             (comp-ctxt-funcs-h comp-ctxt))
    (unless (file-exists-p dir)
      ;; In case it's created in the meanwhile.
      (ignore-error 'file-already-exists
        (make-directory dir t)))
    (unless comp-dry-run
      (comp--compile-ctxt-to-file name))))

(defun comp-final1 ()
  (let (compile-result)
    (comp--init-ctxt)
    (unwind-protect
        (setf compile-result
              (comp-compile-ctxt-to-file (comp-ctxt-output comp-ctxt)))
      (and (comp--release-ctxt)
           compile-result))))

(defun comp-final (_)
  "Final pass driving the C back-end for code emission."
  (if noninteractive
      (comp-final1)
    ;; Call comp-final1 in a child process.
    (let* ((output (comp-ctxt-output comp-ctxt))
           (print-escape-newlines t)
           (print-length nil)
           (print-level nil)
           (print-quoted t)
           (print-gensym t)
           (print-circle t)
           (expr `(progn
                    (require 'comp)
                    (setf comp-speed ,comp-speed
                          comp-debug ,comp-debug
                          comp-verbose ,comp-verbose
                          comp-ctxt ,comp-ctxt
                          comp-eln-load-path ',comp-eln-load-path
                          comp-native-driver-options
                          ',comp-native-driver-options
                          load-path ',load-path)
                    ,comp-async-env-modifier-form
                    (message "Compiling %s..." ',output)
                    (comp-final1)))
           (temp-file (make-temp-file
                       (concat "emacs-int-comp-"
                               (file-name-base output) "-")
                       nil ".el")))
      (with-temp-file temp-file
        (insert (prin1-to-string expr)))
      (with-temp-buffer
        (unwind-protect
            (if (zerop
                 (call-process (expand-file-name invocation-name
                                                 invocation-directory)
                               nil t t "--batch" "-l" temp-file))
                output
              (signal 'native-compiler-error (buffer-string)))
          (comp-log-to-buffer (buffer-string)))))))

\f
;;; Compiler type hints.
;; Public entry points to be used by user code to give comp
;; suggestions about types.  These are used to implement CL style
;; `cl-the' and hopefully parameter type declaration.
;; Note: types will propagates.
;; WARNING: At speed >= 2 type checking is not performed anymore and suggestions
;; are assumed just to be true. Use with extreme caution...

(defun comp-hint-fixnum (x)
  (declare (gv-setter (lambda (val) `(setf ,x ,val))))
  x)

(defun comp-hint-cons (x)
  (declare (gv-setter (lambda (val) `(setf ,x ,val))))
  x)

\f
;; Primitive funciton advice machinery

(defsubst comp-trampoline-sym (subr-name)
  "Given SUBR-NAME return the trampoline function name."
  (intern (concat "--subr-trampoline-" (symbol-name subr-name))))

(defsubst comp-trampoline-filename (subr-name)
  "Given SUBR-NAME return the filename containing the trampoline."
  (concat (comp-c-func-name subr-name "subr-trampoline-" t) ".eln"))

(defun comp-make-lambda-list-from-subr (subr)
  "Given SUBR return the equivalent lambda-list."
  (pcase-let ((`(,min . ,max) (subr-arity subr))
              (lambda-list '()))
    (cl-loop repeat min
             do (push (gensym "arg") lambda-list))
    (if (numberp max)
        (cl-loop
         initially (push '&optional lambda-list)
         repeat (- max min)
         do (push (gensym "arg") lambda-list))
      (push '&rest lambda-list)
      (push (gensym "arg") lambda-list))
    (reverse lambda-list)))

(defun comp-search-trampoline (subr-name)
  "Search a trampoline file for SUBR-NAME.
Return the its filename if found or nil otherwise."
  (cl-loop
   with rel-filename = (comp-trampoline-filename subr-name)
   for dir in comp-eln-load-path
   for filename = (expand-file-name rel-filename
                                    (concat dir comp-native-version-dir))
   when (file-exists-p filename)
     do (cl-return filename)))

(defun comp-tampoline-compile (subr-name)
  "Synthesize and compile a trampoline for SUBR-NAME and return its filename."
  (let ((trampoline-sym (comp-trampoline-sym subr-name))
        (lambda-list (comp-make-lambda-list-from-subr
                      (symbol-function subr-name)))
        ;; Use speed 0 to maximize compilation speed and not to
        ;; optimize away funcall calls!
        (byte-optimize nil)
        (comp-speed 0))
    ;; The synthesized trampoline must expose the exact same ABI of
    ;; the primitive we are replacing in the function reloc table.
    (defalias trampoline-sym
      `(closure nil ,lambda-list
                (let ((f #',subr-name))
                  (,(if (memq '&rest lambda-list) #'apply 'funcall)
                   f
                   ,@(cl-loop
                      for arg in lambda-list
                      unless (memq arg '(&optional &rest))
                      collect arg)))))
    (native-compile
     trampoline-sym nil
     (cl-loop
      for dir in comp-eln-load-path
      for f = (expand-file-name
               (comp-trampoline-filename subr-name)
               (concat dir
                       comp-native-version-dir))
      when (file-writable-p f)
        do (cl-return f)
      finally (error "Can't find a writable directory in \
`comp-eln-load-path'")))))

;;;###autoload
(defun comp-subr-trampoline-install (subr-name)
  "Make SUBR-NAME effectively advice-able when called from native code."
  (unless (or (memq subr-name comp-never-optimize-functions)
              (gethash subr-name comp-installed-trampolines-h))
    (let ((trampoline-sym (comp-trampoline-sym subr-name)))
      (cl-assert (subr-primitive-p (symbol-function subr-name)))
      (load (or (comp-search-trampoline subr-name)
                (comp-tampoline-compile subr-name))
            nil t)
      (cl-assert
       (subr-native-elisp-p (symbol-function trampoline-sym)))
      (comp--install-trampoline subr-name (symbol-function trampoline-sym)))))

\f
;; Some entry point support code.

;;;###autoload
(defun comp-clean-up-stale-eln (file)
  "Given FILE remove all the .eln files in `comp-eln-load-path'
sharing the original source filename (including FILE)."
  (when (string-match (rx "-" (group-n 1 (1+ hex)) "-" (1+ hex) ".eln" eos)
                      file)
    (cl-loop
     with filename-hash = (match-string 1 file)
     with regexp = (rx-to-string
                    `(seq "-" ,filename-hash "-" (1+ hex) ".eln" eos))
     for dir in (butlast comp-eln-load-path) ; Skip last dir.
     do (cl-loop
         with full-dir = (concat dir comp-native-version-dir)
         for f in (when (file-exists-p full-dir)
		    (directory-files full-dir t regexp t))
         do (comp-delete-or-replace-file f)))))

(defun comp-delete-or-replace-file (oldfile &optional newfile)
  "Replace OLDFILE with NEWFILE.
When NEWFILE is nil just delete OLDFILE.
Takes the necessary steps when dealing with OLDFILE being a
shared libraries that may be currently loaded by a running Emacs
session."
  (cond ((eq 'windows-nt system-type)
         (ignore-errors (delete-file oldfile))
         (while
             (condition-case _
                 (progn
                   ;; oldfile maybe recreated by another Emacs in
                   ;; between the following two rename-file calls
                   (if (file-exists-p oldfile)
                       (rename-file oldfile (make-temp-file-internal
                                             (file-name-sans-extension oldfile)
                                             nil ".eln.old" nil)
                                    t))
                   (when newfile
                     (rename-file newfile oldfile nil))
                   ;; Keep on trying.
                   nil)
               (file-already-exists
                ;; Done
                t))))
        ;; Remove the old eln instead of copying the new one into it
        ;; to get a new inode and prevent crashes in case the old one
        ;; is currently loaded.
        (t (delete-file oldfile)
           (when newfile
             (rename-file newfile oldfile)))))

(defvar comp-files-queue ()
  "List of Elisp files to be compiled.")

(defvar comp-async-compilations (make-hash-table :test #'equal)
  "Hash table file-name -> async compilation process.")

(defun comp-async-runnings ()
  "Return the number of async compilations currently running.
This function has the side effect of cleaning-up finished
processes from `comp-async-compilations'"
  (cl-loop
   for file-name in (cl-loop
                     for file-name being each hash-key of comp-async-compilations
                     for prc = (gethash file-name comp-async-compilations)
                     unless (process-live-p prc)
                       collect file-name)
   do (remhash file-name comp-async-compilations))
  (hash-table-count comp-async-compilations))

(defvar comp-num-cpus nil)
(defun comp-effective-async-max-jobs ()
  "Compute the effective number of async jobs."
  (if (zerop comp-async-jobs-number)
      (or comp-num-cpus
          (setf comp-num-cpus
                ;; FIXME: we already have a function to determine
                ;; the number of processors, see get_native_system_info in w32.c.
                ;; The result needs to be exported to Lisp.
                (max 1 (/ (cond ((eq 'windows-nt system-type)
                                 (string-to-number (getenv
                                                    "NUMBER_OF_PROCESSORS")))
                                ((executable-find "nproc")
                                 (string-to-number
                                  (shell-command-to-string "nproc")))
                                (t 1))
                          2))))
    comp-async-jobs-number))

(defun comp-run-async-workers ()
  "Start compiling files from `comp-files-queue' asynchronously.
When compilation is finished, run `comp-async-all-done-hook' and
display a message."
  (if (or comp-files-queue
          (> (comp-async-runnings) 0))
      (unless (>= (comp-async-runnings) (comp-effective-async-max-jobs))
        (cl-loop
         for (source-file . load) = (pop comp-files-queue)
         while source-file
         do (cl-assert (string-match-p comp-valid-source-re source-file) nil
                       "`comp-files-queue' should be \".el\" files: %s"
                       source-file)
         when (or comp-always-compile
                  load ; Always compile when the compilation is
                       ; commanded for late load.
                  (file-newer-than-file-p
                   source-file (comp-el-to-eln-filename source-file)))
         do (let* ((expr `(progn
                            (require 'comp)
                            (setf comp-speed ,comp-speed
                                  comp-debug ,comp-debug
                                  comp-verbose ,comp-verbose
                                  comp-eln-load-path ',comp-eln-load-path
                                  comp-native-driver-options
                                  ',comp-native-driver-options
                                  load-path ',load-path)
                            ,comp-async-env-modifier-form
                            (message "Compiling %s..." ,source-file)
                            (native-compile ,source-file ,(and load t))))
                   (source-file1 source-file) ;; Make the closure works :/
                   (temp-file (make-temp-file
                               (concat "emacs-async-comp-"
                                       (file-name-base source-file) "-")
                               nil ".el"))
                   (expr-string (prin1-to-string expr))
                   (_ (progn
                        (with-temp-file temp-file
                          (insert expr-string))
                        (comp-log "\n")
                        (comp-log expr-string)))
                   (load1 load)
                   (process (make-process
                             :name (concat "Compiling: " source-file)
                             :buffer (get-buffer-create comp-async-buffer-name)
                             :command (list
                                       (expand-file-name invocation-name
                                                         invocation-directory)
                                       "--batch" "-l" temp-file)
                             :sentinel
                             (lambda (process _event)
                               (run-hook-with-args
                                'comp-async-cu-done-hook
                                source-file)
                               (accept-process-output process)
                               (ignore-errors (delete-file temp-file))
                               (when (and load1
                                          (zerop (process-exit-status process)))
                                 (native-elisp-load
                                  (comp-el-to-eln-filename source-file1)
                                  (eq load1 'late)))
                               (comp-run-async-workers)))))
              (puthash source-file process comp-async-compilations))
         when (>= (comp-async-runnings) (comp-effective-async-max-jobs))
           do (cl-return)))
    ;; No files left to compile and all processes finished.
    (run-hooks 'comp-async-all-done-hook)
    (with-current-buffer (get-buffer-create comp-async-buffer-name)
      (save-excursion
        (goto-char (point-max))
        (insert "Compilation finished.\n")))
    ;; `comp-deferred-pending-h' should be empty at this stage.
    ;; Reset it anyway.
    (clrhash comp-deferred-pending-h)))

\f
;;; Compiler entry points.

;;;###autoload
(defun native-compile (function-or-file &optional with-late-load output)
  "Compile FUNCTION-OR-FILE into native code.
This is the entry-point for the Emacs Lisp native compiler.
FUNCTION-OR-FILE is a function symbol or a path to an Elisp file.
When WITH-LATE-LOAD non-nil mark the compilation unit for late load
once finished compiling (internal use only).
When OUTPUT is non-nil use it as filename for the compiled object.
Return the compile object filename."
  (comp-ensure-native-compiler)
  (unless (or (functionp function-or-file)
              (stringp function-or-file))
    (signal 'native-compiler-error
            (list "Not a function symbol or file" function-or-file)))
  (let* ((data function-or-file)
         (comp-native-compiling t)
         ;; Have byte compiler signal an error when compilation fails.
         (byte-compile-debug t)
         (comp-ctxt
          (make-comp-ctxt
           :output (or (when output
                         (expand-file-name output))
                       (if (symbolp function-or-file)
                           (make-temp-file (symbol-name function-or-file) nil
                                           ".eln")
                         (comp-el-to-eln-filename
                          function-or-file
                          (when byte-native-for-bootstrap
                            (car (last comp-eln-load-path))))))
           :with-late-load with-late-load)))
    (comp-log "\n\f\n" 1)
    (condition-case err
        (mapc (lambda (pass)
                (unless (memq pass comp-disabled-passes)
                  (comp-log (format "(%s) Running pass %s:\n"
                                    function-or-file pass)
                            2)
                  (setf data (funcall pass data))
                  (cl-loop for f in (alist-get pass comp-post-pass-hooks)
                           do (funcall f data))))
              comp-passes)
      (native-compiler-error
       ;; Add source input.
       (let ((err-val (cdr err)))
	 (signal (car err) (if (consp err-val)
			       (cons function-or-file err-val)
			     (list function-or-file err-val))))))
    data))

;;;###autoload
(defun batch-native-compile ()
  "Run `native-compile' on remaining command-line arguments.
Ultra cheap impersonation of `batch-byte-compile'."
  (comp-ensure-native-compiler)
  (cl-loop for file in command-line-args-left
           if (or (null byte-native-for-bootstrap)
                  (cl-notany (lambda (re) (string-match re file))
                             comp-bootstrap-black-list))
           do (native-compile file)
           else
           do (byte-compile-file file)))

;;;###autoload
(defun batch-byte-native-compile-for-bootstrap ()
  "As `batch-byte-compile' but used for booststrap.
Generate .elc files in addition to the .eln one.  If the
environment variable 'NATIVE_DISABLED' is set byte compile only."
  (comp-ensure-native-compiler)
  (if (equal (getenv "NATIVE_DISABLED") "1")
      (batch-byte-compile)
    (cl-assert (= 1 (length command-line-args-left)))
    (let ((byte-native-for-bootstrap t)
          (byte-to-native-output-file nil))
      (batch-native-compile)
      (pcase byte-to-native-output-file
        (`(,tempfile . ,target-file)
         (rename-file tempfile target-file t))))))

;;;###autoload
(defun native-compile-async (paths &optional recursively load)
  "Compile PATHS asynchronously.
PATHS is one path or a list of paths to files or directories.
`comp-async-jobs-number' specifies the number of (commands) to
run simultaneously.  If RECURSIVELY, recurse into subdirectories
of given directories.
LOAD can be nil t or 'late."
  (comp-ensure-native-compiler)
  (unless (member load '(nil t late))
    (error "LOAD must be nil t or 'late"))
  (unless (listp paths)
    (setf paths (list paths)))
  (let (files)
    (dolist (path paths)
      (cond ((file-directory-p path)
             (dolist (file (if recursively
                               (directory-files-recursively
                                path comp-valid-source-re)
                             (directory-files path t comp-valid-source-re)))
               (push file files)))
            ((file-exists-p path) (push path files))
            (t (signal 'native-compiler-error
                       (list "Path not a file nor directory" path)))))
    (dolist (file files)
      (if-let ((entry (cl-find file comp-files-queue :key #'car :test #'string=)))
          ;; When no load is specified (plain async compilation) we
          ;; consider valid the one previously queued, otherwise we
          ;; check for coherence (bug#40602).
          (cl-assert (or (null load)
                         (eq load (cdr entry)))
                     nil "Trying to queue %s with LOAD %s but this is already \
queued with LOAD %"
                     file load (cdr entry))
        ;; Make sure we are not already compiling `file' (bug#40838).
        (unless (or (gethash file comp-async-compilations)
                    ;; Also exclude files from deferred compilation if
                    ;; any of the regexps in
                    ;; `comp-deferred-compilation-black-list' matches.
                    (and (eq load 'late)
                         (cl-some (lambda (re) (string-match re file))
                                  comp-deferred-compilation-black-list)))
          (let* ((out-filename (comp-el-to-eln-filename file))
                 (out-dir (file-name-directory out-filename)))
            (unless (file-exists-p out-dir)
              (make-directory out-dir t))
            (if (file-writable-p out-filename)
                (setf comp-files-queue
                      (append comp-files-queue `((,file . ,load))))
              (display-warning 'comp
                               (format "No write access for %s skipping."
                                       out-filename)))))))
    (when (zerop (comp-async-runnings))
      (comp-run-async-workers))))

(provide 'comp)

;;; comp.el ends here

debug log:

solving 763d44a23e ...
found 763d44a23e in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).