llvm.org GIT mirror llvm / release_25 lib / Support / CommandLine.cpp
release_25

Tree @release_25 (Download .tar.gz)

CommandLine.cpp @release_25raw · history · blame

   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
//===-- CommandLine.cpp - Command line parser implementation --------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements a command line argument processor that is useful when
// creating a tool.  It provides a simple, minimalistic interface that is easily
// extensible and supports nonlocal (library) command line options.
//
// Note that rather than trying to figure out what this code does, you could try
// reading the library documentation located in docs/CommandLine.html
//
//===----------------------------------------------------------------------===//

#include "llvm/Config/config.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Path.h"
#include <algorithm>
#include <functional>
#include <map>
#include <ostream>
#include <set>
#include <cstdlib>
#include <cerrno>
#include <cstring>
#include <climits>
using namespace llvm;
using namespace cl;

//===----------------------------------------------------------------------===//
// Template instantiations and anchors.
//
TEMPLATE_INSTANTIATION(class basic_parser<bool>);
TEMPLATE_INSTANTIATION(class basic_parser<boolOrDefault>);
TEMPLATE_INSTANTIATION(class basic_parser<int>);
TEMPLATE_INSTANTIATION(class basic_parser<unsigned>);
TEMPLATE_INSTANTIATION(class basic_parser<double>);
TEMPLATE_INSTANTIATION(class basic_parser<float>);
TEMPLATE_INSTANTIATION(class basic_parser<std::string>);

TEMPLATE_INSTANTIATION(class opt<unsigned>);
TEMPLATE_INSTANTIATION(class opt<int>);
TEMPLATE_INSTANTIATION(class opt<std::string>);
TEMPLATE_INSTANTIATION(class opt<bool>);

void Option::anchor() {}
void basic_parser_impl::anchor() {}
void parser<bool>::anchor() {}
void parser<boolOrDefault>::anchor() {}
void parser<int>::anchor() {}
void parser<unsigned>::anchor() {}
void parser<double>::anchor() {}
void parser<float>::anchor() {}
void parser<std::string>::anchor() {}

//===----------------------------------------------------------------------===//

// Globals for name and overview of program.  Program name is not a string to
// avoid static ctor/dtor issues.
static char ProgramName[80] = "<premain>";
static const char *ProgramOverview = 0;

// This collects additional help to be printed.
static ManagedStatic<std::vector<const char*> > MoreHelp;

extrahelp::extrahelp(const char *Help)
  : morehelp(Help) {
  MoreHelp->push_back(Help);
}

static bool OptionListChanged = false;

// MarkOptionsChanged - Internal helper function.
void cl::MarkOptionsChanged() {
  OptionListChanged = true;
}

/// RegisteredOptionList - This is the list of the command line options that
/// have statically constructed themselves.
static Option *RegisteredOptionList = 0;

void Option::addArgument() {
  assert(NextRegistered == 0 && "argument multiply registered!");

  NextRegistered = RegisteredOptionList;
  RegisteredOptionList = this;
  MarkOptionsChanged();
}


//===----------------------------------------------------------------------===//
// Basic, shared command line option processing machinery.
//

/// GetOptionInfo - Scan the list of registered options, turning them into data
/// structures that are easier to handle.
static void GetOptionInfo(std::vector<Option*> &PositionalOpts,
                          std::vector<Option*> &SinkOpts,
                          std::map<std::string, Option*> &OptionsMap) {
  std::vector<const char*> OptionNames;
  Option *CAOpt = 0;  // The ConsumeAfter option if it exists.
  for (Option *O = RegisteredOptionList; O; O = O->getNextRegisteredOption()) {
    // If this option wants to handle multiple option names, get the full set.
    // This handles enum options like "-O1 -O2" etc.
    O->getExtraOptionNames(OptionNames);
    if (O->ArgStr[0])
      OptionNames.push_back(O->ArgStr);

    // Handle named options.
    for (size_t i = 0, e = OptionNames.size(); i != e; ++i) {
      // Add argument to the argument map!
      if (!OptionsMap.insert(std::pair<std::string,Option*>(OptionNames[i],
                                                            O)).second) {
        cerr << ProgramName << ": CommandLine Error: Argument '"
             << OptionNames[i] << "' defined more than once!\n";
      }
    }

    OptionNames.clear();

    // Remember information about positional options.
    if (O->getFormattingFlag() == cl::Positional)
      PositionalOpts.push_back(O);
    else if (O->getMiscFlags() & cl::Sink) // Remember sink options
      SinkOpts.push_back(O);
    else if (O->getNumOccurrencesFlag() == cl::ConsumeAfter) {
      if (CAOpt)
        O->error("Cannot specify more than one option with cl::ConsumeAfter!");
      CAOpt = O;
    }
  }

  if (CAOpt)
    PositionalOpts.push_back(CAOpt);

  // Make sure that they are in order of registration not backwards.
  std::reverse(PositionalOpts.begin(), PositionalOpts.end());
}


/// LookupOption - Lookup the option specified by the specified option on the
/// command line.  If there is a value specified (after an equal sign) return
/// that as well.
static Option *LookupOption(const char *&Arg, const char *&Value,
                            std::map<std::string, Option*> &OptionsMap) {
  while (*Arg == '-') ++Arg;  // Eat leading dashes

  const char *ArgEnd = Arg;
  while (*ArgEnd && *ArgEnd != '=')
    ++ArgEnd; // Scan till end of argument name.

  if (*ArgEnd == '=')  // If we have an equals sign...
    Value = ArgEnd+1;  // Get the value, not the equals


  if (*Arg == 0) return 0;

  // Look up the option.
  std::map<std::string, Option*>::iterator I =
    OptionsMap.find(std::string(Arg, ArgEnd));
  return I != OptionsMap.end() ? I->second : 0;
}

static inline bool ProvideOption(Option *Handler, const char *ArgName,
                                 const char *Value, int argc, char **argv,
                                 int &i) {
  // Is this a multi-argument option?
  unsigned NumAdditionalVals = Handler->getNumAdditionalVals();

  // Enforce value requirements
  switch (Handler->getValueExpectedFlag()) {
  case ValueRequired:
    if (Value == 0) {       // No value specified?
      if (i+1 < argc) {     // Steal the next argument, like for '-o filename'
        Value = argv[++i];
      } else {
        return Handler->error(" requires a value!");
      }
    }
    break;
  case ValueDisallowed:
    if (NumAdditionalVals > 0)
      return Handler->error(": multi-valued option specified"
      " with ValueDisallowed modifier!");

    if (Value)
      return Handler->error(" does not allow a value! '" +
                            std::string(Value) + "' specified.");
    break;
  case ValueOptional:
    break;
  default:
    cerr << ProgramName
         << ": Bad ValueMask flag! CommandLine usage error:"
         << Handler->getValueExpectedFlag() << "\n";
    abort();
    break;
  }

  // If this isn't a multi-arg option, just run the handler.
  if (NumAdditionalVals == 0) {
    return Handler->addOccurrence(i, ArgName, Value ? Value : "");
  }
  // If it is, run the handle several times.
  else {
    bool MultiArg = false;

    if (Value) {
      if (Handler->addOccurrence(i, ArgName, Value, MultiArg))
        return true;
      --NumAdditionalVals;
      MultiArg = true;
    }

    while (NumAdditionalVals > 0) {

      if (i+1 < argc) {
        Value = argv[++i];
      } else {
        return Handler->error(": not enough values!");
      }
      if (Handler->addOccurrence(i, ArgName, Value, MultiArg))
        return true;
      MultiArg = true;
      --NumAdditionalVals;
    }
    return false;
  }
}

static bool ProvidePositionalOption(Option *Handler, const std::string &Arg,
                                    int i) {
  int Dummy = i;
  return ProvideOption(Handler, Handler->ArgStr, Arg.c_str(), 0, 0, Dummy);
}


// Option predicates...
static inline bool isGrouping(const Option *O) {
  return O->getFormattingFlag() == cl::Grouping;
}
static inline bool isPrefixedOrGrouping(const Option *O) {
  return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
}

// getOptionPred - Check to see if there are any options that satisfy the
// specified predicate with names that are the prefixes in Name.  This is
// checked by progressively stripping characters off of the name, checking to
// see if there options that satisfy the predicate.  If we find one, return it,
// otherwise return null.
//
static Option *getOptionPred(std::string Name, size_t &Length,
                             bool (*Pred)(const Option*),
                             std::map<std::string, Option*> &OptionsMap) {

  std::map<std::string, Option*>::iterator OMI = OptionsMap.find(Name);
  if (OMI != OptionsMap.end() && Pred(OMI->second)) {
    Length = Name.length();
    return OMI->second;
  }

  if (Name.size() == 1) return 0;
  do {
    Name.erase(Name.end()-1, Name.end());   // Chop off the last character...
    OMI = OptionsMap.find(Name);

    // Loop while we haven't found an option and Name still has at least two
    // characters in it (so that the next iteration will not be the empty
    // string...
  } while ((OMI == OptionsMap.end() || !Pred(OMI->second)) && Name.size() > 1);

  if (OMI != OptionsMap.end() && Pred(OMI->second)) {
    Length = Name.length();
    return OMI->second;    // Found one!
  }
  return 0;                // No option found!
}

static bool RequiresValue(const Option *O) {
  return O->getNumOccurrencesFlag() == cl::Required ||
         O->getNumOccurrencesFlag() == cl::OneOrMore;
}

static bool EatsUnboundedNumberOfValues(const Option *O) {
  return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
         O->getNumOccurrencesFlag() == cl::OneOrMore;
}

/// ParseCStringVector - Break INPUT up wherever one or more
/// whitespace characters are found, and store the resulting tokens in
/// OUTPUT. The tokens stored in OUTPUT are dynamically allocated
/// using strdup (), so it is the caller's responsibility to free ()
/// them later.
///
static void ParseCStringVector(std::vector<char *> &output,
                               const char *input) {
  // Characters which will be treated as token separators:
  static const char *const delims = " \v\f\t\r\n";

  std::string work (input);
  // Skip past any delims at head of input string.
  size_t pos = work.find_first_not_of (delims);
  // If the string consists entirely of delims, then exit early.
  if (pos == std::string::npos) return;
  // Otherwise, jump forward to beginning of first word.
  work = work.substr (pos);
  // Find position of first delimiter.
  pos = work.find_first_of (delims);

  while (!work.empty() && pos != std::string::npos) {
    // Everything from 0 to POS is the next word to copy.
    output.push_back (strdup (work.substr (0,pos).c_str ()));
    // Is there another word in the string?
    size_t nextpos = work.find_first_not_of (delims, pos + 1);
    if (nextpos != std::string::npos) {
      // Yes? Then remove delims from beginning ...
      work = work.substr (work.find_first_not_of (delims, pos + 1));
      // and find the end of the word.
      pos = work.find_first_of (delims);
    } else {
      // No? (Remainder of string is delims.) End the loop.
      work = "";
      pos = std::string::npos;
    }
  }

  // If `input' ended with non-delim char, then we'll get here with
  // the last word of `input' in `work'; copy it now.
  if (!work.empty ()) {
    output.push_back (strdup (work.c_str ()));
  }
}

/// ParseEnvironmentOptions - An alternative entry point to the
/// CommandLine library, which allows you to read the program's name
/// from the caller (as PROGNAME) and its command-line arguments from
/// an environment variable (whose name is given in ENVVAR).
///
void cl::ParseEnvironmentOptions(const char *progName, const char *envVar,
                                 const char *Overview, bool ReadResponseFiles) {
  // Check args.
  assert(progName && "Program name not specified");
  assert(envVar && "Environment variable name missing");

  // Get the environment variable they want us to parse options out of.
  const char *envValue = getenv(envVar);
  if (!envValue)
    return;

  // Get program's "name", which we wouldn't know without the caller
  // telling us.
  std::vector<char*> newArgv;
  newArgv.push_back(strdup(progName));

  // Parse the value of the environment variable into a "command line"
  // and hand it off to ParseCommandLineOptions().
  ParseCStringVector(newArgv, envValue);
  int newArgc = static_cast<int>(newArgv.size());
  ParseCommandLineOptions(newArgc, &newArgv[0], Overview, ReadResponseFiles);

  // Free all the strdup()ed strings.
  for (std::vector<char*>::iterator i = newArgv.begin(), e = newArgv.end();
       i != e; ++i)
    free (*i);
}


/// ExpandResponseFiles - Copy the contents of argv into newArgv,
/// substituting the contents of the response files for the arguments
/// of type @file.
static void ExpandResponseFiles(int argc, char** argv,
                                std::vector<char*>& newArgv) {
  for (int i = 1; i != argc; ++i) {
    char* arg = argv[i];

    if (arg[0] == '@') {

      sys::PathWithStatus respFile(++arg);

      // Check that the response file is not empty (mmap'ing empty
      // files can be problematic).
      const sys::FileStatus *FileStat = respFile.getFileStatus();
      if (FileStat && FileStat->getSize() != 0) {

        // Mmap the response file into memory.
        OwningPtr<MemoryBuffer>
          respFilePtr(MemoryBuffer::getFile(respFile.c_str()));

        // If we could open the file, parse its contents, otherwise
        // pass the @file option verbatim.

        // TODO: we should also support recursive loading of response files,
        // since this is how gcc behaves. (From their man page: "The file may
        // itself contain additional @file options; any such options will be
        // processed recursively.")

        if (respFilePtr != 0) {
          ParseCStringVector(newArgv, respFilePtr->getBufferStart());
          continue;
        }
      }
    }
    newArgv.push_back(strdup(arg));
  }
}

void cl::ParseCommandLineOptions(int argc, char **argv,
                                 const char *Overview, bool ReadResponseFiles) {
  // Process all registered options.
  std::vector<Option*> PositionalOpts;
  std::vector<Option*> SinkOpts;
  std::map<std::string, Option*> Opts;
  GetOptionInfo(PositionalOpts, SinkOpts, Opts);

  assert((!Opts.empty() || !PositionalOpts.empty()) &&
         "No options specified!");

  // Expand response files.
  std::vector<char*> newArgv;
  if (ReadResponseFiles) {
    newArgv.push_back(strdup(argv[0]));
    ExpandResponseFiles(argc, argv, newArgv);
    argv = &newArgv[0];
    argc = static_cast<int>(newArgv.size());
  }

  // Copy the program name into ProgName, making sure not to overflow it.
  std::string ProgName = sys::Path(argv[0]).getLast();
  if (ProgName.size() > 79) ProgName.resize(79);
  strcpy(ProgramName, ProgName.c_str());

  ProgramOverview = Overview;
  bool ErrorParsing = false;

  // Check out the positional arguments to collect information about them.
  unsigned NumPositionalRequired = 0;

  // Determine whether or not there are an unlimited number of positionals
  bool HasUnlimitedPositionals = false;

  Option *ConsumeAfterOpt = 0;
  if (!PositionalOpts.empty()) {
    if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
      assert(PositionalOpts.size() > 1 &&
             "Cannot specify cl::ConsumeAfter without a positional argument!");
      ConsumeAfterOpt = PositionalOpts[0];
    }

    // Calculate how many positional values are _required_.
    bool UnboundedFound = false;
    for (size_t i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
         i != e; ++i) {
      Option *Opt = PositionalOpts[i];
      if (RequiresValue(Opt))
        ++NumPositionalRequired;
      else if (ConsumeAfterOpt) {
        // ConsumeAfter cannot be combined with "optional" positional options
        // unless there is only one positional argument...
        if (PositionalOpts.size() > 2)
          ErrorParsing |=
            Opt->error(" error - this positional option will never be matched, "
                       "because it does not Require a value, and a "
                       "cl::ConsumeAfter option is active!");
      } else if (UnboundedFound && !Opt->ArgStr[0]) {
        // This option does not "require" a value...  Make sure this option is
        // not specified after an option that eats all extra arguments, or this
        // one will never get any!
        //
        ErrorParsing |= Opt->error(" error - option can never match, because "
                                   "another positional argument will match an "
                                   "unbounded number of values, and this option"
                                   " does not require a value!");
      }
      UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
    }
    HasUnlimitedPositionals = UnboundedFound || ConsumeAfterOpt;
  }

  // PositionalVals - A vector of "positional" arguments we accumulate into
  // the process at the end...
  //
  std::vector<std::pair<std::string,unsigned> > PositionalVals;

  // If the program has named positional arguments, and the name has been run
  // across, keep track of which positional argument was named.  Otherwise put
  // the positional args into the PositionalVals list...
  Option *ActivePositionalArg = 0;

  // Loop over all of the arguments... processing them.
  bool DashDashFound = false;  // Have we read '--'?
  for (int i = 1; i < argc; ++i) {
    Option *Handler = 0;
    const char *Value = 0;
    const char *ArgName = "";

    // If the option list changed, this means that some command line
    // option has just been registered or deregistered.  This can occur in
    // response to things like -load, etc.  If this happens, rescan the options.
    if (OptionListChanged) {
      PositionalOpts.clear();
      SinkOpts.clear();
      Opts.clear();
      GetOptionInfo(PositionalOpts, SinkOpts, Opts);
      OptionListChanged = false;
    }

    // Check to see if this is a positional argument.  This argument is
    // considered to be positional if it doesn't start with '-', if it is "-"
    // itself, or if we have seen "--" already.
    //
    if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
      // Positional argument!
      if (ActivePositionalArg) {
        ProvidePositionalOption(ActivePositionalArg, argv[i], i);
        continue;  // We are done!
      } else if (!PositionalOpts.empty()) {
        PositionalVals.push_back(std::make_pair(argv[i],i));

        // All of the positional arguments have been fulfulled, give the rest to
        // the consume after option... if it's specified...
        //
        if (PositionalVals.size() >= NumPositionalRequired &&
            ConsumeAfterOpt != 0) {
          for (++i; i < argc; ++i)
            PositionalVals.push_back(std::make_pair(argv[i],i));
          break;   // Handle outside of the argument processing loop...
        }

        // Delay processing positional arguments until the end...
        continue;
      }
    } else if (argv[i][0] == '-' && argv[i][1] == '-' && argv[i][2] == 0 &&
               !DashDashFound) {
      DashDashFound = true;  // This is the mythical "--"?
      continue;              // Don't try to process it as an argument itself.
    } else if (ActivePositionalArg &&
               (ActivePositionalArg->getMiscFlags() & PositionalEatsArgs)) {
      // If there is a positional argument eating options, check to see if this
      // option is another positional argument.  If so, treat it as an argument,
      // otherwise feed it to the eating positional.
      ArgName = argv[i]+1;
      Handler = LookupOption(ArgName, Value, Opts);
      if (!Handler || Handler->getFormattingFlag() != cl::Positional) {
        ProvidePositionalOption(ActivePositionalArg, argv[i], i);
        continue;  // We are done!
      }

    } else {     // We start with a '-', must be an argument...
      ArgName = argv[i]+1;
      Handler = LookupOption(ArgName, Value, Opts);

      // Check to see if this "option" is really a prefixed or grouped argument.
      if (Handler == 0) {
        std::string RealName(ArgName);
        if (RealName.size() > 1) {
          size_t Length = 0;
          Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping,
                                        Opts);

          // If the option is a prefixed option, then the value is simply the
          // rest of the name...  so fall through to later processing, by
          // setting up the argument name flags and value fields.
          //
          if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
            Value = ArgName+Length;
            assert(Opts.find(std::string(ArgName, Value)) != Opts.end() &&
                   Opts.find(std::string(ArgName, Value))->second == PGOpt);
            Handler = PGOpt;
          } else if (PGOpt) {
            // This must be a grouped option... handle them now.
            assert(isGrouping(PGOpt) && "Broken getOptionPred!");

            do {
              // Move current arg name out of RealName into RealArgName...
              std::string RealArgName(RealName.begin(),
                                      RealName.begin() + Length);
              RealName.erase(RealName.begin(), RealName.begin() + Length);

              // Because ValueRequired is an invalid flag for grouped arguments,
              // we don't need to pass argc/argv in...
              //
              assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
                     "Option can not be cl::Grouping AND cl::ValueRequired!");
              int Dummy;
              ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(),
                                            0, 0, 0, Dummy);

              // Get the next grouping option...
              PGOpt = getOptionPred(RealName, Length, isGrouping, Opts);
            } while (PGOpt && Length != RealName.size());

            Handler = PGOpt; // Ate all of the options.
          }
        }
      }
    }

    if (Handler == 0) {
      if (SinkOpts.empty()) {
        cerr << ProgramName << ": Unknown command line argument '"
             << argv[i] << "'.  Try: '" << argv[0] << " --help'\n";
        ErrorParsing = true;
      } else {
        for (std::vector<Option*>::iterator I = SinkOpts.begin(),
               E = SinkOpts.end(); I != E ; ++I)
          (*I)->addOccurrence(i, "", argv[i]);
      }
      continue;
    }

    // Check to see if this option accepts a comma separated list of values.  If
    // it does, we have to split up the value into multiple values...
    if (Value && Handler->getMiscFlags() & CommaSeparated) {
      std::string Val(Value);
      std::string::size_type Pos = Val.find(',');

      while (Pos != std::string::npos) {
        // Process the portion before the comma...
        ErrorParsing |= ProvideOption(Handler, ArgName,
                                      std::string(Val.begin(),
                                                  Val.begin()+Pos).c_str(),
                                      argc, argv, i);
        // Erase the portion before the comma, AND the comma...
        Val.erase(Val.begin(), Val.begin()+Pos+1);
        Value += Pos+1;  // Increment the original value pointer as well...

        // Check for another comma...
        Pos = Val.find(',');
      }
    }

    // If this is a named positional argument, just remember that it is the
    // active one...
    if (Handler->getFormattingFlag() == cl::Positional)
      ActivePositionalArg = Handler;
    else
      ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
  }

  // Check and handle positional arguments now...
  if (NumPositionalRequired > PositionalVals.size()) {
    cerr << ProgramName
         << ": Not enough positional command line arguments specified!\n"
         << "Must specify at least " << NumPositionalRequired
         << " positional arguments: See: " << argv[0] << " --help\n";

    ErrorParsing = true;
  } else if (!HasUnlimitedPositionals
             && PositionalVals.size() > PositionalOpts.size()) {
    cerr << ProgramName
         << ": Too many positional arguments specified!\n"
         << "Can specify at most " << PositionalOpts.size()
         << " positional arguments: See: " << argv[0] << " --help\n";
    ErrorParsing = true;

  } else if (ConsumeAfterOpt == 0) {
    // Positional args have already been handled if ConsumeAfter is specified...
    unsigned ValNo = 0, NumVals = static_cast<unsigned>(PositionalVals.size());
    for (size_t i = 0, e = PositionalOpts.size(); i != e; ++i) {
      if (RequiresValue(PositionalOpts[i])) {
        ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo].first,
                                PositionalVals[ValNo].second);
        ValNo++;
        --NumPositionalRequired;  // We fulfilled our duty...
      }

      // If we _can_ give this option more arguments, do so now, as long as we
      // do not give it values that others need.  'Done' controls whether the
      // option even _WANTS_ any more.
      //
      bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
      while (NumVals-ValNo > NumPositionalRequired && !Done) {
        switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
        case cl::Optional:
          Done = true;          // Optional arguments want _at most_ one value
          // FALL THROUGH
        case cl::ZeroOrMore:    // Zero or more will take all they can get...
        case cl::OneOrMore:     // One or more will take all they can get...
          ProvidePositionalOption(PositionalOpts[i],
                                  PositionalVals[ValNo].first,
                                  PositionalVals[ValNo].second);
          ValNo++;
          break;
        default:
          assert(0 && "Internal error, unexpected NumOccurrences flag in "
                 "positional argument processing!");
        }
      }
    }
  } else {
    assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
    unsigned ValNo = 0;
    for (size_t j = 1, e = PositionalOpts.size(); j != e; ++j)
      if (RequiresValue(PositionalOpts[j])) {
        ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
                                                PositionalVals[ValNo].first,
                                                PositionalVals[ValNo].second);
        ValNo++;
      }

    // Handle the case where there is just one positional option, and it's
    // optional.  In this case, we want to give JUST THE FIRST option to the
    // positional option and keep the rest for the consume after.  The above
    // loop would have assigned no values to positional options in this case.
    //
    if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty()) {
      ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
                                              PositionalVals[ValNo].first,
                                              PositionalVals[ValNo].second);
      ValNo++;
    }

    // Handle over all of the rest of the arguments to the
    // cl::ConsumeAfter command line option...
    for (; ValNo != PositionalVals.size(); ++ValNo)
      ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
                                              PositionalVals[ValNo].first,
                                              PositionalVals[ValNo].second);
  }

  // Loop over args and make sure all required args are specified!
  for (std::map<std::string, Option*>::iterator I = Opts.begin(),
         E = Opts.end(); I != E; ++I) {
    switch (I->second->getNumOccurrencesFlag()) {
    case Required:
    case OneOrMore:
      if (I->second->getNumOccurrences() == 0) {
        I->second->error(" must be specified at least once!");
        ErrorParsing = true;
      }
      // Fall through
    default:
      break;
    }
  }

  // Free all of the memory allocated to the map.  Command line options may only
  // be processed once!
  Opts.clear();
  PositionalOpts.clear();
  MoreHelp->clear();

  // Free the memory allocated by ExpandResponseFiles.
  if (ReadResponseFiles) {
    // Free all the strdup()ed strings.
    for (std::vector<char*>::iterator i = newArgv.begin(), e = newArgv.end();
         i != e; ++i)
      free (*i);
  }

  // If we had an error processing our arguments, don't let the program execute
  if (ErrorParsing) exit(1);
}

//===----------------------------------------------------------------------===//
// Option Base class implementation
//

bool Option::error(std::string Message, const char *ArgName) {
  if (ArgName == 0) ArgName = ArgStr;
  if (ArgName[0] == 0)
    cerr << HelpStr;  // Be nice for positional arguments
  else
    cerr << ProgramName << ": for the -" << ArgName;

  cerr << " option: " << Message << "\n";
  return true;
}

bool Option::addOccurrence(unsigned pos, const char *ArgName,
                           const std::string &Value,
                           bool MultiArg) {
  if (!MultiArg)
    NumOccurrences++;   // Increment the number of times we have been seen

  switch (getNumOccurrencesFlag()) {
  case Optional:
    if (NumOccurrences > 1)
      return error(": may only occur zero or one times!", ArgName);
    break;
  case Required:
    if (NumOccurrences > 1)
      return error(": must occur exactly one time!", ArgName);
    // Fall through
  case OneOrMore:
  case ZeroOrMore:
  case ConsumeAfter: break;
  default: return error(": bad num occurrences flag value!");
  }

  return handleOccurrence(pos, ArgName, Value);
}


// getValueStr - Get the value description string, using "DefaultMsg" if nothing
// has been specified yet.
//
static const char *getValueStr(const Option &O, const char *DefaultMsg) {
  if (O.ValueStr[0] == 0) return DefaultMsg;
  return O.ValueStr;
}

//===----------------------------------------------------------------------===//
// cl::alias class implementation
//

// Return the width of the option tag for printing...
size_t alias::getOptionWidth() const {
  return std::strlen(ArgStr)+6;
}

// Print out the option for the alias.
void alias::printOptionInfo(size_t GlobalWidth) const {
  size_t L = std::strlen(ArgStr);
  cout << "  -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
       << HelpStr << "\n";
}



//===----------------------------------------------------------------------===//
// Parser Implementation code...
//

// basic_parser implementation
//

// Return the width of the option tag for printing...
size_t basic_parser_impl::getOptionWidth(const Option &O) const {
  size_t Len = std::strlen(O.ArgStr);
  if (const char *ValName = getValueName())
    Len += std::strlen(getValueStr(O, ValName))+3;

  return Len + 6;
}

// printOptionInfo - Print out information about this option.  The
// to-be-maintained width is specified.
//
void basic_parser_impl::printOptionInfo(const Option &O,
                                        size_t GlobalWidth) const {
  cout << "  -" << O.ArgStr;

  if (const char *ValName = getValueName())
    cout << "=<" << getValueStr(O, ValName) << ">";

  cout << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
       << O.HelpStr << "\n";
}




// parser<bool> implementation
//
bool parser<bool>::parse(Option &O, const char *ArgName,
                         const std::string &Arg, bool &Value) {
  if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
      Arg == "1") {
    Value = true;
  } else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
    Value = false;
  } else {
    return O.error(": '" + Arg +
                   "' is invalid value for boolean argument! Try 0 or 1");
  }
  if (IsInvertable && strncmp(ArgName+1, "no-", 3) == 0)
    Value = !Value;
  return false;
}

// parser<boolOrDefault> implementation
//
bool parser<boolOrDefault>::parse(Option &O, const char *ArgName,
                         const std::string &Arg, boolOrDefault &Value) {
  if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
      Arg == "1") {
    Value = BOU_TRUE;
  } else if (Arg == "false" || Arg == "FALSE"
             || Arg == "False" || Arg == "0") {
    Value = BOU_FALSE;
  } else {
    return O.error(": '" + Arg +
                   "' is invalid value for boolean argument! Try 0 or 1");
  }
  return false;
}

// parser<int> implementation
//
bool parser<int>::parse(Option &O, const char *ArgName,
                        const std::string &Arg, int &Value) {
  char *End;
  Value = (int)strtol(Arg.c_str(), &End, 0);
  if (*End != 0)
    return O.error(": '" + Arg + "' value invalid for integer argument!");
  return false;
}

// parser<unsigned> implementation
//
bool parser<unsigned>::parse(Option &O, const char *ArgName,
                             const std::string &Arg, unsigned &Value) {
  char *End;
  errno = 0;
  unsigned long V = strtoul(Arg.c_str(), &End, 0);
  Value = (unsigned)V;
  if (((V == ULONG_MAX) && (errno == ERANGE))
      || (*End != 0)
      || (Value != V))
    return O.error(": '" + Arg + "' value invalid for uint argument!");
  return false;
}

// parser<double>/parser<float> implementation
//
static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
  const char *ArgStart = Arg.c_str();
  char *End;
  Value = strtod(ArgStart, &End);
  if (*End != 0)
    return O.error(": '" +Arg+ "' value invalid for floating point argument!");
  return false;
}

bool parser<double>::parse(Option &O, const char *AN,
                           const std::string &Arg, double &Val) {
  return parseDouble(O, Arg, Val);
}

bool parser<float>::parse(Option &O, const char *AN,
                          const std::string &Arg, float &Val) {
  double dVal;
  if (parseDouble(O, Arg, dVal))
    return true;
  Val = (float)dVal;
  return false;
}



// generic_parser_base implementation
//

// findOption - Return the option number corresponding to the specified
// argument string.  If the option is not found, getNumOptions() is returned.
//
unsigned generic_parser_base::findOption(const char *Name) {
  unsigned i = 0, e = getNumOptions();
  std::string N(Name);

  while (i != e)
    if (getOption(i) == N)
      return i;
    else
      ++i;
  return e;
}


// Return the width of the option tag for printing...
size_t generic_parser_base::getOptionWidth(const Option &O) const {
  if (O.hasArgStr()) {
    size_t Size = std::strlen(O.ArgStr)+6;
    for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
      Size = std::max(Size, std::strlen(getOption(i))+8);
    return Size;
  } else {
    size_t BaseSize = 0;
    for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
      BaseSize = std::max(BaseSize, std::strlen(getOption(i))+8);
    return BaseSize;
  }
}

// printOptionInfo - Print out information about this option.  The
// to-be-maintained width is specified.
//
void generic_parser_base::printOptionInfo(const Option &O,
                                          size_t GlobalWidth) const {
  if (O.hasArgStr()) {
    size_t L = std::strlen(O.ArgStr);
    cout << "  -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
         << " - " << O.HelpStr << "\n";

    for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
      size_t NumSpaces = GlobalWidth-strlen(getOption(i))-8;
      cout << "    =" << getOption(i) << std::string(NumSpaces, ' ')
           << " -   " << getDescription(i) << "\n";
    }
  } else {
    if (O.HelpStr[0])
      cout << "  " << O.HelpStr << "\n";
    for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
      size_t L = std::strlen(getOption(i));
      cout << "    -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
           << " - " << getDescription(i) << "\n";
    }
  }
}


//===----------------------------------------------------------------------===//
// --help and --help-hidden option implementation
//

namespace {

class HelpPrinter {
  size_t MaxArgLen;
  const Option *EmptyArg;
  const bool ShowHidden;

  // isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
  inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
    return OptPair.second->getOptionHiddenFlag() >= Hidden;
  }
  inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
    return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
  }

public:
  explicit HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
    EmptyArg = 0;
  }

  void operator=(bool Value) {
    if (Value == false) return;

    // Get all the options.
    std::vector<Option*> PositionalOpts;
    std::vector<Option*> SinkOpts;
    std::map<std::string, Option*> OptMap;
    GetOptionInfo(PositionalOpts, SinkOpts, OptMap);

    // Copy Options into a vector so we can sort them as we like...
    std::vector<std::pair<std::string, Option*> > Opts;
    copy(OptMap.begin(), OptMap.end(), std::back_inserter(Opts));

    // Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
    Opts.erase(std::remove_if(Opts.begin(), Opts.end(),
                          std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
               Opts.end());

    // Eliminate duplicate entries in table (from enum flags options, f.e.)
    {  // Give OptionSet a scope
      std::set<Option*> OptionSet;
      for (unsigned i = 0; i != Opts.size(); ++i)
        if (OptionSet.count(Opts[i].second) == 0)
          OptionSet.insert(Opts[i].second);   // Add new entry to set
        else
          Opts.erase(Opts.begin()+i--);    // Erase duplicate
    }

    if (ProgramOverview)
      cout << "OVERVIEW: " << ProgramOverview << "\n";

    cout << "USAGE: " << ProgramName << " [options]";

    // Print out the positional options.
    Option *CAOpt = 0;   // The cl::ConsumeAfter option, if it exists...
    if (!PositionalOpts.empty() &&
        PositionalOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
      CAOpt = PositionalOpts[0];

    for (size_t i = CAOpt != 0, e = PositionalOpts.size(); i != e; ++i) {
      if (PositionalOpts[i]->ArgStr[0])
        cout << " --" << PositionalOpts[i]->ArgStr;
      cout << " " << PositionalOpts[i]->HelpStr;
    }

    // Print the consume after option info if it exists...
    if (CAOpt) cout << " " << CAOpt->HelpStr;

    cout << "\n\n";

    // Compute the maximum argument length...
    MaxArgLen = 0;
    for (size_t i = 0, e = Opts.size(); i != e; ++i)
      MaxArgLen = std::max(MaxArgLen, Opts[i].second->getOptionWidth());

    cout << "OPTIONS:\n";
    for (size_t i = 0, e = Opts.size(); i != e; ++i)
      Opts[i].second->printOptionInfo(MaxArgLen);

    // Print any extra help the user has declared.
    for (std::vector<const char *>::iterator I = MoreHelp->begin(),
          E = MoreHelp->end(); I != E; ++I)
      cout << *I;
    MoreHelp->clear();

    // Halt the program since help information was printed
    exit(1);
  }
};
} // End anonymous namespace

// Define the two HelpPrinter instances that are used to print out help, or
// help-hidden...
//
static HelpPrinter NormalPrinter(false);
static HelpPrinter HiddenPrinter(true);

static cl::opt<HelpPrinter, true, parser<bool> >
HOp("help", cl::desc("Display available options (--help-hidden for more)"),
    cl::location(NormalPrinter), cl::ValueDisallowed);

static cl::opt<HelpPrinter, true, parser<bool> >
HHOp("help-hidden", cl::desc("Display all available options"),
     cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);

static void (*OverrideVersionPrinter)() = 0;

namespace {
class VersionPrinter {
public:
  void print() {
        cout << "Low Level Virtual Machine (http://llvm.org/):\n";
        cout << "  " << PACKAGE_NAME << " version " << PACKAGE_VERSION;
#ifdef LLVM_VERSION_INFO
        cout << LLVM_VERSION_INFO;
#endif
        cout << "\n  ";
#ifndef __OPTIMIZE__
        cout << "DEBUG build";
#else
        cout << "Optimized build";
#endif
#ifndef NDEBUG
        cout << " with assertions";
#endif
        cout << ".\n";
        cout << "  Built " << __DATE__ << "(" << __TIME__ << ").\n";
  }
  void operator=(bool OptionWasSpecified) {
    if (OptionWasSpecified) {
      if (OverrideVersionPrinter == 0) {
        print();
        exit(1);
      } else {
        (*OverrideVersionPrinter)();
        exit(1);
      }
    }
  }
};
} // End anonymous namespace


// Define the --version option that prints out the LLVM version for the tool
static VersionPrinter VersionPrinterInstance;

static cl::opt<VersionPrinter, true, parser<bool> >
VersOp("version", cl::desc("Display the version of this program"),
    cl::location(VersionPrinterInstance), cl::ValueDisallowed);

// Utility function for printing the help message.
void cl::PrintHelpMessage() {
  // This looks weird, but it actually prints the help message. The
  // NormalPrinter variable is a HelpPrinter and the help gets printed when
  // its operator= is invoked. That's because the "normal" usages of the
  // help printer is to be assigned true/false depending on whether the
  // --help option was given or not. Since we're circumventing that we have
  // to make it look like --help was given, so we assign true.
  NormalPrinter = true;
}

/// Utility function for printing version number.
void cl::PrintVersionMessage() {
  VersionPrinterInstance.print();
}

void cl::SetVersionPrinter(void (*func)()) {
  OverrideVersionPrinter = func;
}