mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

about summary refs log tree commit diff stats

path: root/tools/iso/kernel.soso/fatfs_ffconf.h

diff options

Diffstat (limited to 'tools/iso/kernel.soso/fatfs_ffconf.h')

0 files changed, 0 insertions, 0 deletions

2'>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

#
#
#           The Nimrod Compiler
#        (c) Copyright 2013 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#

# This module is responsible for loading of rod files.
#
# Reading and writing binary files are really hard to debug. Therefore we use
# a "creative" text/binary hybrid format. ROD-files are more efficient
# to process because symbols can be loaded on demand.
# 
# A ROD file consists of:
#
#  - a header:
#    NIM:$fileversion\n
#  - the module's id (even if the module changed, its ID will not!):
#    ID:Ax3\n
#  - CRC value of this module:
#    CRC:CRC-val\n
#  - a section containing the compiler options and defines this
#    module has been compiled with:
#    OPTIONS:options\n
#    GOPTIONS:options\n # global options
#    CMD:command\n
#    DEFINES:defines\n
#  - FILES(
#    myfile.inc
#    lib/mymodA
#    )
#  - an include file dependency section:
#    INCLUDES(
#    <fileidx> <CRC of myfile.inc>\n # fileidx is the LINE in the file section!
#    )
#  - a module dependency section:
#    DEPS: <fileidx> <fileidx>\n
#  - an interface section:
#    INTERF(
#    identifier1 id\n # id is the symbol's id
#    identifier2 id\n
#    )
#  - a compiler proc section:
#    COMPILERPROCS(
#    identifier1 id\n # id is the symbol's id    
#    )
#  - an index consisting of (ID, linenumber)-pairs:
#    INDEX(
#    id-diff idx-diff\n
#    id-diff idx-diff\n
#    )
#
#    Since the whole index has to be read in advance, we compress it by 
#    storing the integer differences to the last entry instead of using the
#    real numbers.
#
#  - an import index consisting of (ID, moduleID)-pairs:
#    IMPORTS(
#    id-diff moduleID-diff\n
#    id-diff moduleID-diff\n
#    )
#  - a list of all exported type converters because they are needed for correct
#    semantic checking:
#    CONVERTERS:id id\n   # symbol ID
#
#    This is a misnomer now; it's really a "load unconditionally" section as
#    it is also used for pattern templates.
#
#  - a list of all (private or exported) methods because they are needed for
#    correct dispatcher generation:
#    METHODS: id id\n   # symbol ID
#  - an AST section that contains the module's AST:
#    INIT(
#    idx\n  # position of the node in the DATA section
#    idx\n
#    )
#  - a data section, where each type, symbol or AST is stored.
#    DATA(
#    type
#    (node)
#    sym
#    )
#
#    The data section MUST be the last section of the file, because processing
#    stops immediately after ``DATA(`` and the rest is only loaded on demand
#    by using a mem'mapped file.
#

import 
  os, options, strutils, nversion, ast, astalgo, msgs, platform, condsyms, 
  ropes, idents, crc, idgen, types, rodutils, memfiles

type 
  TReasonForRecompile* = enum ## all the reasons that can trigger recompilation
    rrEmpty,                  # dependencies not yet computed
    rrNone,                   # no need to recompile
    rrRodDoesNotExist,        # rod file does not exist
    rrRodInvalid,             # rod file is invalid
    rrCrcChange,              # file has been edited since last recompilation
    rrDefines,                # defines have changed
    rrOptions,                # options have changed
    rrInclDeps,               # an include has changed
    rrModDeps                 # a module this module depends on has been changed

const 
  reasonToFrmt*: array[TReasonForRecompile, string] = ["", 
    "no need to recompile: $1", "symbol file for $1 does not exist", 
    "symbol file for $1 has the wrong version", 
    "file edited since last compilation: $1", 
    "list of conditional symbols changed for: $1", 
    "list of options changed for: $1", 
    "an include file edited: $1", 
    "a module $1 depends on has changed"]

type
  TIndex*{.final.} = object   # an index with compression
    lastIdxKey*, lastIdxVal*: int
    tab*: TIITable
    r*: string                # writers use this
    offset*: int              # readers use this
  
  TRodReader* = object of TObject
    pos: int                 # position; used for parsing
    s: cstring               # mmap'ed file contents
    options: TOptions
    reason: TReasonForRecompile
    modDeps: seq[int32]
    files: seq[int32]
    dataIdx: int             # offset of start of data section
    convertersIdx: int       # offset of start of converters section
    initIdx, interfIdx, compilerProcsIdx, methodsIdx: int
    filename: string
    index, imports: TIndex
    readerIndex: int
    line: int            # only used for debugging, but is always in the code
    moduleID: int
    syms: TIdTable       # already processed symbols
    memfile: TMemFile    # unfortunately there is no point in time where we
                         # can close this! XXX
    methods*: TSymSeq
  
  PRodReader* = ref TRodReader

var rodCompilerprocs*: TStrTable

proc handleSymbolFile*(module: PSym): PRodReader
# global because this is needed by magicsys
proc loadInitSection*(r: PRodReader): PNode

# implementation

proc rawLoadStub(s: PSym)

var gTypeTable: TIdTable

proc rrGetSym(r: PRodReader, id: int, info: TLineInfo): PSym
  # `info` is only used for debugging purposes
proc rrGetType(r: PRodReader, id: int, info: TLineInfo): PType

proc decodeLineInfo(r: PRodReader, info: var TLineInfo) = 
  if r.s[r.pos] == '?': 
    inc(r.pos)
    if r.s[r.pos] == ',': info.col = -1'i16
    else: info.col = int16(decodeVInt(r.s, r.pos))
    if r.s[r.pos] == ',': 
      inc(r.pos)
      if r.s[r.pos] == ',': info.line = -1'i16
      else: info.line = int16(decodeVInt(r.s, r.pos))
      if r.s[r.pos] == ',': 
        inc(r.pos)
        info = newLineInfo(r.files[decodeVInt(r.s, r.pos)], info.line, info.col)

proc skipNode(r: PRodReader) =
  assert r.s[r.pos] == '('
  var par = 0
  var pos = r.pos+1
  while true:
    case r.s[pos]
    of ')':
      if par == 0: break
      dec par
    of '(': inc par
    else: nil
    inc pos
  r.pos = pos+1 # skip ')'

proc decodeNodeLazyBody(r: PRodReader, fInfo: TLineInfo, 
                        belongsTo: PSym): PNode = 
  result = nil
  if r.s[r.pos] == '(': 
    inc(r.pos)
    if r.s[r.pos] == ')': 
      inc(r.pos)
      return                  # nil node
    result = newNodeI(TNodeKind(decodeVInt(r.s, r.pos)), fInfo)
    decodeLineInfo(r, result.info)
    if r.s[r.pos] == '$': 
      inc(r.pos)
      result.flags = cast[TNodeFlags](int32(decodeVInt(r.s, r.pos)))
    if r.s[r.pos] == '^': 
      inc(r.pos)
      var id = decodeVInt(r.s, r.pos)
      result.typ = rrGetType(r, id, result.info)
    case result.kind
    of nkCharLit..nkInt64Lit: 
      if r.s[r.pos] == '!': 
        inc(r.pos)
        result.intVal = decodeVBiggestInt(r.s, r.pos)
    of nkFloatLit..nkFloat64Lit: 
      if r.s[r.pos] == '!': 
        inc(r.pos)
        var fl = decodeStr(r.s, r.pos)
        result.floatVal = parseFloat(fl)
    of nkStrLit..nkTripleStrLit: 
      if r.s[r.pos] == '!': 
        inc(r.pos)
        result.strVal = decodeStr(r.s, r.pos)
      else: 
        result.strVal = ""    # BUGFIX
    of nkIdent: 
      if r.s[r.pos] == '!': 
        inc(r.pos)
        var fl = decodeStr(r.s, r.pos)
        result.ident = getIdent(fl)
      else: 
        internalError(result.info, "decodeNode: nkIdent")
    of nkSym: 
      if r.s[r.pos] == '!': 
        inc(r.pos)
        var id = decodeVInt(r.s, r.pos)
        result.sym = rrGetSym(r, id, result.info)
      else: 
        internalError(result.info, "decodeNode: nkSym")
    else:
      var i = 0
      while r.s[r.pos] != ')': 
        if belongsTo != nil and i == bodyPos:
          addSonNilAllowed(result, nil)
          belongsTo.offset = r.pos
          skipNode(r)
        else:
          addSonNilAllowed(result, decodeNodeLazyBody(r, result.info, nil))
        inc i
    if r.s[r.pos] == ')': inc(r.pos)
    else: internalError(result.info, "decodeNode: ')' missing")
  else:
    InternalError(fInfo, "decodeNode: '(' missing " & $r.pos)

proc decodeNode(r: PRodReader, fInfo: TLineInfo): PNode =
  result = decodeNodeLazyBody(r, fInfo, nil)
  
proc decodeLoc(r: PRodReader, loc: var TLoc, info: TLineInfo) = 
  if r.s[r.pos] == '<': 
    inc(r.pos)
    if r.s[r.pos] in {'0'..'9', 'a'..'z', 'A'..'Z'}: 
      loc.k = TLocKind(decodeVInt(r.s, r.pos))
    else: 
      loc.k = low(loc.k)
    if r.s[r.pos] == '*': 
      inc(r.pos)
      loc.s = TStorageLoc(decodeVInt(r.s, r.pos))
    else: 
      loc.s = low(loc.s)
    if r.s[r.pos] == '$': 
      inc(r.pos)
      loc.flags = cast[TLocFlags](int32(decodeVInt(r.s, r.pos)))
    else: 
      loc.flags = {}
    if r.s[r.pos] == '^': 
      inc(r.pos)
      loc.t = rrGetType(r, decodeVInt(r.s, r.pos), info)
    else: 
      loc.t = nil
    if r.s[r.pos] == '!': 
      inc(r.pos)
      loc.r = toRope(decodeStr(r.s, r.pos))
    else: 
      loc.r = nil
    if r.s[r.pos] == '?': 
      inc(r.pos)
      loc.a = decodeVInt(r.s, r.pos)
    else: 
      loc.a = 0
    if r.s[r.pos] == '>': inc(r.pos)
    else: InternalError(info, "decodeLoc " & r.s[r.pos])
  
proc decodeType(r: PRodReader, info: TLineInfo): PType = 
  result = nil
  if r.s[r.pos] == '[': 
    inc(r.pos)
    if r.s[r.pos] == ']': 
      inc(r.pos)
      return                  # nil type
  new(result)
  result.kind = TTypeKind(decodeVInt(r.s, r.pos))
  if r.s[r.pos] == '+': 
    inc(r.pos)
    result.id = decodeVInt(r.s, r.pos)
    setId(result.id)
    if debugIds: registerID(result)
  else: 
    InternalError(info, "decodeType: no id")
  # here this also avoids endless recursion for recursive type
  IdTablePut(gTypeTable, result, result) 
  if r.s[r.pos] == '(': result.n = decodeNode(r, UnknownLineInfo())
  if r.s[r.pos] == '$': 
    inc(r.pos)
    result.flags = cast[TTypeFlags](int32(decodeVInt(r.s, r.pos)))
  if r.s[r.pos] == '?': 
    inc(r.pos)
    result.callConv = TCallingConvention(decodeVInt(r.s, r.pos))
  if r.s[r.pos] == '*': 
    inc(r.pos)
    result.owner = rrGetSym(r, decodeVInt(r.s, r.pos), info)
  if r.s[r.pos] == '&': 
    inc(r.pos)
    result.sym = rrGetSym(r, decodeVInt(r.s, r.pos), info)
  if r.s[r.pos] == '/': 
    inc(r.pos)
    result.size = decodeVInt(r.s, r.pos)
  else: 
    result.size = - 1
  if r.s[r.pos] == '=': 
    inc(r.pos)
    result.align = decodeVInt(r.s, r.pos)
  else: 
    result.align = 2
  if r.s[r.pos] == '@': 
    inc(r.pos)
    result.containerID = decodeVInt(r.s, r.pos)
  decodeLoc(r, result.loc, info)
  while r.s[r.pos] == '^': 
    inc(r.pos)
    if r.s[r.pos] == '(': 
      inc(r.pos)
      if r.s[r.pos] == ')': inc(r.pos)
      else: InternalError(info, "decodeType ^(" & r.s[r.pos])
      rawAddSon(result, nil)
    else: 
      var d = decodeVInt(r.s, r.pos)
      rawAddSon(result, rrGetType(r, d, info))

proc decodeLib(r: PRodReader, info: TLineInfo): PLib = 
  result = nil
  if r.s[r.pos] == '|': 
    new(result)
    inc(r.pos)
    result.kind = TLibKind(decodeVInt(r.s, r.pos))
    if r.s[r.pos] != '|': InternalError("decodeLib: 1")
    inc(r.pos)
    result.name = toRope(decodeStr(r.s, r.pos))
    if r.s[r.pos] != '|': InternalError("decodeLib: 2")
    inc(r.pos)
    result.path = decodeNode(r, info)

proc decodeSym(r: PRodReader, info: TLineInfo): PSym = 
  var 
    id: int
    ident: PIdent
  result = nil
  if r.s[r.pos] == '{': 
    inc(r.pos)
    if r.s[r.pos] == '}': 
      inc(r.pos)
      return                  # nil sym
  var k = TSymKind(decodeVInt(r.s, r.pos))
  if r.s[r.pos] == '+': 
    inc(r.pos)
    id = decodeVInt(r.s, r.pos)
    setId(id)
  else:
    InternalError(info, "decodeSym: no id")
  if r.s[r.pos] == '&': 
    inc(r.pos)
    ident = getIdent(decodeStr(r.s, r.pos))
  else:
    InternalError(info, "decodeSym: no ident")
  #echo "decoding: {", ident.s
  result = PSym(IdTableGet(r.syms, id))
  if result == nil: 
    new(result)
    result.id = id
    IdTablePut(r.syms, result, result)
    if debugIds: registerID(result)
  elif result.id != id:
    InternalError(info, "decodeSym: wrong id")
  elif result.kind != skStub:
    # we already loaded the symbol
    return
  else:
    reset(result[])
    result.id = id
  result.kind = k
  result.name = ident         # read the rest of the symbol description:
  if r.s[r.pos] == '^': 
    inc(r.pos)
    result.typ = rrGetType(r, decodeVInt(r.s, r.pos), info)
  decodeLineInfo(r, result.info)
  if r.s[r.pos] == '*': 
    inc(r.pos)
    result.owner = rrGetSym(r, decodeVInt(r.s, r.pos), result.info)
  if r.s[r.pos] == '$': 
    inc(r.pos)
    result.flags = cast[TSymFlags](int32(decodeVInt(r.s, r.pos)))
  if r.s[r.pos] == '@': 
    inc(r.pos)
    result.magic = TMagic(decodeVInt(r.s, r.pos))
  if r.s[r.pos] == '!': 
    inc(r.pos)
    result.options = cast[TOptions](int32(decodeVInt(r.s, r.pos)))
  else: 
    result.options = r.options
  if r.s[r.pos] == '%': 
    inc(r.pos)
    result.position = decodeVInt(r.s, r.pos)
  elif result.kind notin routineKinds + {skModule}:
    result.position = 0
    # this may have been misused as reader index! But we still
    # need it for routines as the body is loaded lazily.
  if r.s[r.pos] == '`': 
    inc(r.pos)
    result.offset = decodeVInt(r.s, r.pos)
  else: 
    result.offset = - 1
  decodeLoc(r, result.loc, result.info)
  result.annex = decodeLib(r, info)
  if r.s[r.pos] == '#':
    inc(r.pos)
    result.constraint = decodeNode(r, UnknownLineInfo())
  if r.s[r.pos] == '(':
    if result.kind in routineKinds:
      result.ast = decodeNodeLazyBody(r, result.info, result)
      # since we load the body lazily, we need to set the reader to
      # be able to reload:
      result.position = r.readerIndex
    else:
      result.ast = decodeNode(r, result.info)
  #echo "decoded: ", ident.s, "}"

proc skipSection(r: PRodReader) = 
  if r.s[r.pos] == ':': 
    while r.s[r.pos] > '\x0A': inc(r.pos)
  elif r.s[r.pos] == '(': 
    var c = 0                 # count () pairs
    inc(r.pos)
    while true: 
      case r.s[r.pos]
      of '\x0A': inc(r.line)
      of '(': inc(c)
      of ')': 
        if c == 0: 
          inc(r.pos)
          break 
        elif c > 0: 
          dec(c)
      of '\0': break          # end of file
      else: nil
      inc(r.pos)
  else: 
    InternalError("skipSection " & $r.line)
  
proc rdWord(r: PRodReader): string = 
  result = ""
  while r.s[r.pos] in {'A'..'Z', '_', 'a'..'z', '0'..'9'}: 
    add(result, r.s[r.pos])
    inc(r.pos)

proc newStub(r: PRodReader, name: string, id: int): PSym = 
  new(result)
  result.kind = skStub
  result.id = id
  result.name = getIdent(name)
  result.position = r.readerIndex
  setID(id)                   #MessageOut(result.name.s);
  if debugIds: registerID(result)
  
proc processInterf(r: PRodReader, module: PSym) = 
  if r.interfIdx == 0: InternalError("processInterf")
  r.pos = r.interfIdx
  while (r.s[r.pos] > '\x0A') and (r.s[r.pos] != ')'): 
    var w = decodeStr(r.s, r.pos)
    inc(r.pos)
    var key = decodeVInt(r.s, r.pos)
    inc(r.pos)                # #10
    var s = newStub(r, w, key)
    s.owner = module
    StrTableAdd(module.tab, s)
    IdTablePut(r.syms, s, s)

proc processCompilerProcs(r: PRodReader, module: PSym) = 
  if r.compilerProcsIdx == 0: InternalError("processCompilerProcs")
  r.pos = r.compilerProcsIdx
  while (r.s[r.pos] > '\x0A') and (r.s[r.pos] != ')'): 
    var w = decodeStr(r.s, r.pos)
    inc(r.pos)
    var key = decodeVInt(r.s, r.pos)
    inc(r.pos)                # #10
    var s = PSym(IdTableGet(r.syms, key))
    if s == nil: 
      s = newStub(r, w, key)
      s.owner = module
      IdTablePut(r.syms, s, s)
    StrTableAdd(rodCompilerProcs, s)

proc processIndex(r: PRodReader; idx: var TIndex; outf: TFile = nil) = 
  var key, val, tmp: int
  inc(r.pos, 2)               # skip "(\10"
  inc(r.line)
  while (r.s[r.pos] > '\x0A') and (r.s[r.pos] != ')'): 
    tmp = decodeVInt(r.s, r.pos)
    if r.s[r.pos] == ' ': 
      inc(r.pos)
      key = idx.lastIdxKey + tmp
      val = decodeVInt(r.s, r.pos) + idx.lastIdxVal
    else:
      key = idx.lastIdxKey + 1
      val = tmp + idx.lastIdxVal
    IITablePut(idx.tab, key, val)
    if not outf.isNil: outf.write(key, " ", val, "\n")
    idx.lastIdxKey = key
    idx.lastIdxVal = val
    setID(key)                # ensure that this id will not be used
    if r.s[r.pos] == '\x0A': 
      inc(r.pos)
      inc(r.line)
  if r.s[r.pos] == ')': inc(r.pos)
  
proc cmdChangeTriggersRecompilation(old, new: TCommands): bool =
  if old == new: return false
  # we use a 'case' statement without 'else' so that addition of a
  # new command forces us to consider it here :-)
  case old
  of cmdCompileToC, cmdCompileToCpp, cmdCompileToOC,
      cmdCompileToJS, cmdCompileToLLVM:
    if new in {cmdDoc, cmdCheck, cmdIdeTools, cmdPretty, cmdDef,
               cmdInteractive}:
      return false
  of cmdNone, cmdDoc, cmdInterpret, cmdPretty, cmdGenDepend, cmdDump,
      cmdCheck, cmdParse, cmdScan, cmdIdeTools, cmdDef, 
      cmdRst2html, cmdRst2tex, cmdInteractive, cmdRun:
    nil
  # else: trigger recompilation:
  result = true
  
proc processRodFile(r: PRodReader, crc: TCrc32) = 
  var 
    w: string
    d, inclCrc: int
  while r.s[r.pos] != '\0': 
    var section = rdWord(r)
    if r.reason != rrNone: 
      break                   # no need to process this file further
    case section 
    of "CRC": 
      inc(r.pos)              # skip ':'
      if int(crc) != decodeVInt(r.s, r.pos): r.reason = rrCrcChange
    of "ID": 
      inc(r.pos)              # skip ':'
      r.moduleID = decodeVInt(r.s, r.pos)
      setID(r.moduleID)
    of "OPTIONS": 
      inc(r.pos)              # skip ':'
      r.options = cast[TOptions](int32(decodeVInt(r.s, r.pos)))
      if options.gOptions != r.options: r.reason = rrOptions
    of "GOPTIONS":
      inc(r.pos)              # skip ':'
      var dep = cast[TGlobalOptions](int32(decodeVInt(r.s, r.pos)))
      if gGlobalOptions != dep: r.reason = rrOptions
    of "CMD":
      inc(r.pos)              # skip ':'
      var dep = cast[TCommands](int32(decodeVInt(r.s, r.pos)))
      if cmdChangeTriggersRecompilation(dep, gCmd): r.reason = rrOptions
    of "DEFINES":
      inc(r.pos)              # skip ':'
      d = 0
      while r.s[r.pos] > '\x0A': 
        w = decodeStr(r.s, r.pos)
        inc(d)
        if not condsyms.isDefined(getIdent(w)): 
          r.reason = rrDefines #MessageOut('not defined, but should: ' + w);
        if r.s[r.pos] == ' ': inc(r.pos)
      if (d != countDefinedSymbols()): r.reason = rrDefines
    of "FILES": 
      inc(r.pos, 2)           # skip "(\10"
      inc(r.line)
      while r.s[r.pos] != ')':
        let relativePath = decodeStr(r.s, r.pos)
        let resolvedPath = relativePath.findModule
        let finalPath = if resolvedPath.len > 0: resolvedPath else: relativePath
        r.files.add(finalPath.fileInfoIdx)
        inc(r.pos)            # skip #10
        inc(r.line)
      if r.s[r.pos] == ')': inc(r.pos)
    of "INCLUDES": 
      inc(r.pos, 2)           # skip "(\10"
      inc(r.line)
      while r.s[r.pos] != ')': 
        w = r.files[decodeVInt(r.s, r.pos)].toFullPath
        inc(r.pos)            # skip ' '
        inclCrc = decodeVInt(r.s, r.pos)
        if r.reason == rrNone: 
          if not ExistsFile(w) or (inclCrc != int(crcFromFile(w))): 
            r.reason = rrInclDeps
        if r.s[r.pos] == '\x0A': 
          inc(r.pos)
          inc(r.line)
      if r.s[r.pos] == ')': inc(r.pos)
    of "DEPS":
      inc(r.pos)              # skip ':'
      while r.s[r.pos] > '\x0A':
        r.modDeps.add(r.files[int32(decodeVInt(r.s, r.pos))])
        if r.s[r.pos] == ' ': inc(r.pos)
    of "INTERF": 
      r.interfIdx = r.pos + 2
      skipSection(r)
    of "COMPILERPROCS": 
      r.compilerProcsIdx = r.pos + 2
      skipSection(r)
    of "INDEX": 
      processIndex(r, r.index)
    of "IMPORTS": 
      processIndex(r, r.imports)
    of "CONVERTERS": 
      r.convertersIdx = r.pos + 1
      skipSection(r)
    of "METHODS":
      r.methodsIdx = r.pos + 1
      skipSection(r)
    of "DATA": 
      r.dataIdx = r.pos + 2 # "(\10"
      # We do not read the DATA section here! We read the needed objects on
      # demand. And the DATA section comes last in the file, so we stop here:
      break
    of "INIT": 
      r.initIdx = r.pos + 2   # "(\10"
      skipSection(r)
    else:
      InternalError("invalid section: '" & section &
                    "' at " & $r.line & " in " & r.filename)
      #MsgWriteln("skipping section: " & section &
      #           " at " & $r.line & " in " & r.filename)
      skipSection(r)
    if r.s[r.pos] == '\x0A': 
      inc(r.pos)
      inc(r.line)


proc startsWith(buf: cstring, token: string, pos = 0): bool =
  var s = 0
  while s < token.len and buf[pos+s] == token[s]: inc s
  result = s == token.len

proc newRodReader(modfilename: string, crc: TCrc32, 
                  readerIndex: int): PRodReader = 
  new(result)
  try:
    result.memFile = memfiles.open(modfilename)
  except EOS:
    return nil
  result.files = @[]
  result.modDeps = @[]
  result.methods = @[]
  var r = result
  r.reason = rrNone
  r.pos = 0
  r.line = 1
  r.readerIndex = readerIndex
  r.filename = modfilename
  InitIdTable(r.syms)
  # we terminate the file explicitely with ``\0``, so the cast to `cstring`
  # is safe:
  r.s = cast[cstring](r.memFile.mem)
  if startsWith(r.s, "NIM:"): 
    initIITable(r.index.tab)
    initIITable(r.imports.tab) # looks like a ROD file
    inc(r.pos, 4)
    var version = ""
    while r.s[r.pos] notin {'\0', '\x0A'}:
      add(version, r.s[r.pos])
      inc(r.pos)
    if r.s[r.pos] == '\x0A': inc(r.pos)
    if version != RodFileVersion: 
      # since ROD files are only for caching, no backwards compatibility is
      # needed
      result = nil
  else:
    result = nil
  
proc rrGetType(r: PRodReader, id: int, info: TLineInfo): PType = 
  result = PType(IdTableGet(gTypeTable, id))
  if result == nil: 
    # load the type:
    var oldPos = r.pos
    var d = IITableGet(r.index.tab, id)
    if d == invalidKey: InternalError(info, "rrGetType")
    r.pos = d + r.dataIdx
    result = decodeType(r, info)
    r.pos = oldPos

type 
  TFileModuleRec{.final.} = object 
    filename*: string
    reason*: TReasonForRecompile
    rd*: PRodReader
    crc*: TCrc32
    crcDone*: bool

  TFileModuleMap = seq[TFileModuleRec]

var gMods*: TFileModuleMap = @[]

proc decodeSymSafePos(rd: PRodReader, offset: int, info: TLineInfo): PSym = 
  # all compiled modules
  if rd.dataIdx == 0: InternalError(info, "dataIdx == 0")
  var oldPos = rd.pos
  rd.pos = offset + rd.dataIdx
  result = decodeSym(rd, info)
  rd.pos = oldPos

proc findSomeWhere(id: int) =
  for i in countup(0, high(gMods)): 
    var rd = gMods[i].rd
    if rd != nil: 
      var d = IITableGet(rd.index.tab, id)
      if d != invalidKey:
        echo "found id ", id, " in ", gMods[i].filename

proc getReader(moduleId: int): PRodReader =
  InternalAssert moduleId >= 0 and moduleId < gMods.len
  result = gMods[moduleId].rd

proc rrGetSym(r: PRodReader, id: int, info: TLineInfo): PSym = 
  result = PSym(IdTableGet(r.syms, id))
  if result == nil: 
    # load the symbol:
    var d = IITableGet(r.index.tab, id)
    if d == invalidKey: 
      # import from other module:
      var moduleID = IiTableGet(r.imports.tab, id)
      if moduleID < 0:
        var x = ""
        encodeVInt(id, x)
        InternalError(info, "missing from both indexes: +" & x)
      var rd = getReader(moduleID)
      d = IITableGet(rd.index.tab, id)
      if d != invalidKey: 
        result = decodeSymSafePos(rd, d, info)
      else:
        var x = ""
        encodeVInt(id, x)
        when false: findSomeWhere(id)
        InternalError(info, "rrGetSym: no reader found: +" & x)
    else: 
      # own symbol:
      result = decodeSymSafePos(r, d, info)
  if result != nil and result.kind == skStub: rawLoadStub(result)
  
proc loadInitSection(r: PRodReader): PNode = 
  if r.initIdx == 0 or r.dataIdx == 0: InternalError("loadInitSection")
  var oldPos = r.pos
  r.pos = r.initIdx
  result = newNode(nkStmtList)
  while r.s[r.pos] > '\x0A' and r.s[r.pos] != ')': 
    var d = decodeVInt(r.s, r.pos)
    inc(r.pos)                # #10
    var p = r.pos
    r.pos = d + r.dataIdx
    addSon(result, decodeNode(r, UnknownLineInfo()))
    r.pos = p
  r.pos = oldPos

proc loadConverters(r: PRodReader) = 
  # We have to ensure that no exported converter is a stub anymore, and the
  # import mechanism takes care of the rest.
  if r.convertersIdx == 0 or r.dataIdx == 0: 
    InternalError("importConverters")
  r.pos = r.convertersIdx
  while r.s[r.pos] > '\x0A': 
    var d = decodeVInt(r.s, r.pos)
    discard rrGetSym(r, d, UnknownLineInfo())
    if r.s[r.pos] == ' ': inc(r.pos)

proc loadMethods(r: PRodReader) =
  if r.methodsIdx == 0 or r.dataIdx == 0:
    InternalError("loadMethods")
  r.pos = r.methodsIdx
  while r.s[r.pos] > '\x0A':
    var d = decodeVInt(r.s, r.pos)
    r.methods.add(rrGetSym(r, d, UnknownLineInfo()))
    if r.s[r.pos] == ' ': inc(r.pos)

proc GetCRC*(fileIdx: int32): TCrc32 =
  InternalAssert fileIdx >= 0 and fileIdx < gMods.len

  if gMods[fileIdx].crcDone:
    return gMods[fileIdx].crc
  
  result = crcFromFile(fileIdx.toFilename)
  gMods[fileIdx].crc = result

template growCache*(cache, pos) =
  if cache.len <= pos: cache.setLen(pos+1)

proc checkDep(fileIdx: int32): TReasonForRecompile =
  assert fileIdx != InvalidFileIDX
  growCache gMods, fileIdx
  if gMods[fileIdx].reason != rrEmpty: 
    # reason has already been computed for this module:
    return gMods[fileIdx].reason
  let filename = fileIdx.toFilename
  var crc = GetCRC(fileIdx)
  gMods[fileIdx].reason = rrNone  # we need to set it here to avoid cycles
  result = rrNone
  var r: PRodReader = nil
  var rodfile = toGeneratedFile(filename, RodExt)
  r = newRodReader(rodfile, crc, fileIdx)
  if r == nil: 
    result = (if ExistsFile(rodfile): rrRodInvalid else: rrRodDoesNotExist)
  else:
    processRodFile(r, crc)
    result = r.reason
    if result == rrNone: 
      # check modules it depends on
      # NOTE: we need to process the entire module graph so that no ID will
      # be used twice! However, compilation speed does not suffer much from
      # this, since results are cached.
      var res = checkDep(SystemFileIdx)
      if res != rrNone: result = rrModDeps
      for i in countup(0, high(r.modDeps)):
        res = checkDep(r.modDeps[i])
        if res != rrNone:
          result = rrModDeps
          # we cannot break here, because of side-effects of `checkDep`
  if result != rrNone and gVerbosity > 0:
    rawMessage(hintProcessing, reasonToFrmt[result] % filename)
  if result != rrNone or optForceFullMake in gGlobalOptions:
    # recompilation is necessary:
    if r != nil: memfiles.close(r.memFile)
    r = nil
  gMods[fileIdx].rd = r
  gMods[fileIdx].reason = result  # now we know better
  
proc handleSymbolFile(module: PSym): PRodReader = 
  let fileIdx = module.fileIdx
  if optSymbolFiles notin gGlobalOptions: 
    module.id = getID()
    return nil
  idgen.loadMaxIds(options.gProjectPath / options.gProjectName)

  discard checkDep(fileIdx)
  if gMods[fileIdx].reason == rrEmpty: InternalError("handleSymbolFile")
  result = gMods[fileIdx].rd
  if result != nil: 
    module.id = result.moduleID
    IdTablePut(result.syms, module, module)
    processInterf(result, module)
    processCompilerProcs(result, module)
    loadConverters(result)
    loadMethods(result)
  else:
    module.id = getID()

proc rawLoadStub(s: PSym) =
  if s.kind != skStub: InternalError("loadStub")
  var rd = gMods[s.position].rd
  var theId = s.id                # used for later check
  var d = IITableGet(rd.index.tab, s.id)
  if d == invalidKey: InternalError("loadStub: invalid key")
  var rs = decodeSymSafePos(rd, d, UnknownLineInfo())
  if rs != s:
    #echo "rs: ", toHex(cast[int](rs.position), int.sizeof * 2),
    #     "\ns:  ", toHex(cast[int](s.position), int.sizeof * 2)
    InternalError(rs.info, "loadStub: wrong symbol")
  elif rs.id != theId: 
    InternalError(rs.info, "loadStub: wrong ID") 
  #MessageOut('loaded stub: ' + s.name.s);
  
proc LoadStub*(s: PSym) =
  ## loads the stub symbol `s`.
  
  # deactivate the GC here because we do a deep recursion and generate no
  # garbage when restoring parts of the object graph anyway.
  # Since we die with internal errors if this fails, so no try-finally is
  # necessary.
  GC_disable()
  rawLoadStub(s)
  GC_enable()
  
proc getBody*(s: PSym): PNode =
  ## retrieves the AST's body of `s`. If `s` has been loaded from a rod-file
  ## it may perform an expensive reload operation. Otherwise it's a simple
  ## accessor.
  assert s.kind in routineKinds
  result = s.ast.sons[bodyPos]
  if result == nil:
    assert s.offset != 0
    var r = gMods[s.position].rd
    var oldPos = r.pos
    r.pos = s.offset
    result = decodeNode(r, s.info)
    r.pos = oldPos
    s.ast.sons[bodyPos] = result
    s.offset = 0
  
InitIdTable(gTypeTable)
InitStrTable(rodCompilerProcs)

# viewer:
proc writeNode(f: TFile; n: PNode) =
  f.write("(")
  if n != nil:
    f.write($n.kind)
    if n.typ != nil:
      f.write('^')
      f.write(n.typ.id)
    case n.kind
    of nkCharLit..nkInt64Lit: 
      if n.intVal != 0:
        f.write('!')
        f.write(n.intVal)
    of nkFloatLit..nkFloat64Lit: 
      if n.floatVal != 0.0: 
        f.write('!')
        f.write($n.floatVal)
    of nkStrLit..nkTripleStrLit:
      if n.strVal != "": 
        f.write('!')
        f.write(n.strVal.escape)
    of nkIdent:
      f.write('!')
      f.write(n.ident.s)
    of nkSym:
      f.write('!')
      f.write(n.sym.id)
    else:
      for i in countup(0, sonsLen(n) - 1): 
        writeNode(f, n.sons[i])
  f.write(")")

proc writeSym(f: TFile; s: PSym) =
  if s == nil:
    f.write("{}\n")
    return
  f.write("{")
  f.write($s.kind)
  f.write('+')
  f.write(s.id)
  f.write('&')
  f.write(s.name.s)
  if s.typ != nil:
    f.write('^')
    f.write(s.typ.id)
  if s.owner != nil:
    f.write('*')
    f.write(s.owner.id)
  if s.flags != {}:
    f.write('$')
    f.write($s.flags)
  if s.magic != mNone:
    f.write('@')
    f.write($s.magic)
  if s.options != gOptions: 
    f.write('!')
    f.write($s.options)
  if s.position != 0: 
    f.write('%')
    f.write($s.position)
  if s.offset != -1:
    f.write('`')
    f.write($s.offset)
  if s.constraint != nil:
    f.write('#')
    f.writeNode(s.constraint)
  if s.ast != nil:
    f.writeNode(s.ast)
  f.write("}\n")

proc writeType(f: TFile; t: PType) =
  if t == nil:
    f.write("[]\n")
    return
  f.write('[')
  f.write($t.kind)
  f.write('+')
  f.write($t.id)
  if t.n != nil: 
    f.writeNode(t.n)
  if t.flags != {}:
    f.write('$')
    f.write($t.flags)
  if t.callConv != low(t.callConv): 
    f.write('?')
    f.write($t.callConv)
  if t.owner != nil:
    f.write('*')
    f.write($t.owner.id)
  if t.sym != nil:
    f.write('&')
    f.write(t.sym.id)
  if t.size != -1:
    f.write('/')
    f.write($t.size)
  if t.align != 2:
    f.write('=')
    f.write($t.align)
  if t.containerID != 0: 
    f.write('@')
    f.write($t.containerID)
  for i in countup(0, sonsLen(t) - 1): 
    if t.sons[i] == nil: 
      f.write("^()")
    else:
      f.write('^') 
      f.write($t.sons[i].id)
  f.write("]\n")

proc viewFile(rodfile: string) =
  var r = newRodReader(rodfile, 0, 0)
  if r == nil:
    rawMessage(errGenerated, "cannot open file (or maybe wrong version):" &
       rodfile)
    return
  var outf = system.open(rodfile.changeFileExt(".rod.txt"), fmWrite)
  while r.s[r.pos] != '\0':
    let section = rdWord(r)
    case section
    of "CRC":
      inc(r.pos)              # skip ':'
      outf.writeln("CRC:", $decodeVInt(r.s, r.pos))
    of "ID": 
      inc(r.pos)              # skip ':'
      r.moduleID = decodeVInt(r.s, r.pos)
      setID(r.moduleID)
      outf.writeln("ID:", $r.moduleID)
    of "OPTIONS":
      inc(r.pos)              # skip ':'
      r.options = cast[TOptions](int32(decodeVInt(r.s, r.pos)))
      outf.writeln("OPTIONS:", $r.options)
    of "GOPTIONS":
      inc(r.pos)              # skip ':'
      let dep = cast[TGlobalOptions](int32(decodeVInt(r.s, r.pos)))
      outf.writeln("GOPTIONS:", $dep)
    of "CMD":
      inc(r.pos)              # skip ':'
      let dep = cast[TCommands](int32(decodeVInt(r.s, r.pos)))
      outf.writeln("CMD:", $dep)
    of "DEFINES":
      inc(r.pos)              # skip ':'
      var d = 0
      outf.write("DEFINES:")
      while r.s[r.pos] > '\x0A':
        let w = decodeStr(r.s, r.pos)
        inc(d)
        outf.write(" ", w)
        if r.s[r.pos] == ' ': inc(r.pos)
      outf.write("\n")
    of "FILES": 
      inc(r.pos, 2)           # skip "(\10"
      inc(r.line)
      outf.write("FILES(\n")
      while r.s[r.pos] != ')':
        let relativePath = decodeStr(r.s, r.pos)
        let resolvedPath = relativePath.findModule
        let finalPath = if resolvedPath.len > 0: resolvedPath else: relativePath
        r.files.add(finalPath.fileInfoIdx)
        inc(r.pos)            # skip #10
        inc(r.line)
        outf.writeln finalPath
      if r.s[r.pos] == ')': inc(r.pos)
      outf.write(")\n")
    of "INCLUDES": 
      inc(r.pos, 2)           # skip "(\10"
      inc(r.line)
      outf.write("INCLUDES(\n")
      while r.s[r.pos] != ')': 
        let w = r.files[decodeVInt(r.s, r.pos)]
        inc(r.pos)            # skip ' '
        let inclCrc = decodeVInt(r.s, r.pos)
        if r.s[r.pos] == '\x0A': 
          inc(r.pos)
          inc(r.line)
        outf.write(w, " ", inclCrc, "\n")
      if r.s[r.pos] == ')': inc(r.pos)
      outf.write(")\n")
    of "DEPS":
      inc(r.pos)              # skip ':'
      outf.write("DEPS:")
      while r.s[r.pos] > '\x0A': 
        let v = int32(decodeVInt(r.s, r.pos))
        r.modDeps.add(r.files[v])
        if r.s[r.pos] == ' ': inc(r.pos)
        outf.write(" ", r.files[v])
      outf.write("\n")
    of "INTERF",  "COMPILERPROCS":
      inc r.pos, 2
      if section == "INTERF": r.interfIdx = r.pos
      else: r.compilerProcsIdx = r.pos
      outf.write(section, "(\n")
      while (r.s[r.pos] > '\x0A') and (r.s[r.pos] != ')'):
        let w = decodeStr(r.s, r.pos)
        inc(r.pos)
        let key = decodeVInt(r.s, r.pos)
        inc(r.pos)                # #10
        outf.write(w, " ", key, "\n")
      if r.s[r.pos] == ')': inc r.pos
      outf.write(")\n")
    of "INDEX":
      outf.write(section, "(\n")
      processIndex(r, r.index, outf)
      outf.write(")\n")
    of "IMPORTS":
      outf.write(section, "(\n")
      processIndex(r, r.imports, outf)
      outf.write(")\n")
    of "CONVERTERS",  "METHODS":
      inc r.pos
      if section == "METHODS": r.methodsIdx = r.pos
      else: r.convertersIdx = r.pos
      outf.write(section, ":")
      while r.s[r.pos] > '\x0A': 
        let d = decodeVInt(r.s, r.pos)
        outf.write(" ", $d)
        if r.s[r.pos] == ' ': inc(r.pos)
      outf.write("\n")
    of "DATA":
      inc(r.pos, 2)
      r.dataIdx = r.pos
      outf.write("DATA(\n")
      while r.s[r.pos] != ')':
        if r.s[r.pos] == '(':
          outf.writeNode decodeNode(r, UnknownLineInfo())
          outf.write("\n")
        elif r.s[r.pos] == '[':
          outf.writeType decodeType(r, UnknownLineInfo())
        else:
          outf.writeSym decodeSym(r, UnknownLineInfo())
        if r.s[r.pos] == '\x0A':
          inc(r.pos)
          inc(r.line)
      if r.s[r.pos] == ')': inc r.pos
      outf.write(")\n")
    of "INIT":
      outf.write("INIT(\n")
      inc r.pos, 2
      r.initIdx = r.pos
      while r.s[r.pos] > '\x0A' and r.s[r.pos] != ')': 
        let d = decodeVInt(r.s, r.pos)
        inc(r.pos)                # #10
        #let p = r.pos
        #r.pos = d + r.dataIdx
        #outf.writeNode decodeNode(r, UnknownLineInfo())
        #outf.write("\n")
        #r.pos = p
      if r.s[r.pos] == ')': inc r.pos
      outf.write("\n")
    else:
      InternalError("invalid section: '" & section &
                    "' at " & $r.line & " in " & r.filename)
      skipSection(r)
    if r.s[r.pos] == '\x0A':
      inc(r.pos)
      inc(r.line)
  outf.close

when isMainModule:
  viewFile(paramStr(1).addFileExt(rodExt))


context:
space:
mode: