llvm.org GIT mirror llvm / 159c735 lib / Support / Triple.cpp
159c735

Tree @159c735 (Download .tar.gz)

Triple.cpp @159c735raw · 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
//===--- Triple.cpp - Target triple helper class --------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/Triple.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstring>
using namespace llvm;

const char *Triple::getArchTypeName(ArchType Kind) {
  switch (Kind) {
  case UnknownArch: return "unknown";

  case arm:     return "arm";
  case cellspu: return "cellspu";
  case hexagon: return "hexagon";
  case mips:    return "mips";
  case mipsel:  return "mipsel";
  case mips64:  return "mips64";
  case mips64el:return "mips64el";
  case msp430:  return "msp430";
  case ppc64:   return "powerpc64";
  case ppc:     return "powerpc";
  case r600:    return "r600";
  case sparc:   return "sparc";
  case sparcv9: return "sparcv9";
  case tce:     return "tce";
  case thumb:   return "thumb";
  case x86:     return "i386";
  case x86_64:  return "x86_64";
  case xcore:   return "xcore";
  case mblaze:  return "mblaze";
  case nvptx:   return "nvptx";
  case nvptx64: return "nvptx64";
  case le32:    return "le32";
  case amdil:   return "amdil";
  case spir:    return "spir";
  }

  llvm_unreachable("Invalid ArchType!");
}

const char *Triple::getArchTypePrefix(ArchType Kind) {
  switch (Kind) {
  default:
    return 0;

  case arm:
  case thumb:   return "arm";

  case cellspu: return "spu";

  case ppc64:
  case ppc:     return "ppc";

  case mblaze:  return "mblaze";

  case mips:
  case mipsel:
  case mips64:
  case mips64el:return "mips";

  case hexagon: return "hexagon";

  case r600:    return "r600";

  case sparcv9:
  case sparc:   return "sparc";

  case x86:
  case x86_64:  return "x86";

  case xcore:   return "xcore";

  case nvptx:   return "nvptx";
  case nvptx64: return "nvptx";
  case le32:    return "le32";
  case amdil:   return "amdil";
  case spir:    return "spir";
  }
}

const char *Triple::getVendorTypeName(VendorType Kind) {
  switch (Kind) {
  case UnknownVendor: return "unknown";

  case Apple: return "apple";
  case PC: return "pc";
  case SCEI: return "scei";
  case BGP: return "bgp";
  case BGQ: return "bgq";
  case Freescale: return "fsl";
  case IBM: return "ibm";
  }

  llvm_unreachable("Invalid VendorType!");
}

const char *Triple::getOSTypeName(OSType Kind) {
  switch (Kind) {
  case UnknownOS: return "unknown";

  case AuroraUX: return "auroraux";
  case Cygwin: return "cygwin";
  case Darwin: return "darwin";
  case DragonFly: return "dragonfly";
  case FreeBSD: return "freebsd";
  case IOS: return "ios";
  case KFreeBSD: return "kfreebsd";
  case Linux: return "linux";
  case Lv2: return "lv2";
  case MacOSX: return "macosx";
  case MinGW32: return "mingw32";
  case NetBSD: return "netbsd";
  case OpenBSD: return "openbsd";
  case Solaris: return "solaris";
  case Win32: return "win32";
  case Haiku: return "haiku";
  case Minix: return "minix";
  case RTEMS: return "rtems";
  case NativeClient: return "nacl";
  case CNK: return "cnk";
  case Bitrig: return "bitrig";
  case AIX: return "aix";
  }

  llvm_unreachable("Invalid OSType");
}

const char *Triple::getEnvironmentTypeName(EnvironmentType Kind) {
  switch (Kind) {
  case UnknownEnvironment: return "unknown";
  case GNU: return "gnu";
  case GNUEABIHF: return "gnueabihf";
  case GNUEABI: return "gnueabi";
  case EABI: return "eabi";
  case MachO: return "macho";
  case Android: return "android";
  case ELF: return "elf";
  }

  llvm_unreachable("Invalid EnvironmentType!");
}

Triple::ArchType Triple::getArchTypeForLLVMName(StringRef Name) {
  return StringSwitch<Triple::ArchType>(Name)
    .Case("arm", arm)
    .Case("cellspu", cellspu)
    .Case("mips", mips)
    .Case("mipsel", mipsel)
    .Case("mips64", mips64)
    .Case("mips64el", mips64el)
    .Case("msp430", msp430)
    .Case("ppc64", ppc64)
    .Case("ppc32", ppc)
    .Case("ppc", ppc)
    .Case("mblaze", mblaze)
    .Case("r600", r600)
    .Case("hexagon", hexagon)
    .Case("sparc", sparc)
    .Case("sparcv9", sparcv9)
    .Case("tce", tce)
    .Case("thumb", thumb)
    .Case("x86", x86)
    .Case("x86-64", x86_64)
    .Case("xcore", xcore)
    .Case("nvptx", nvptx)
    .Case("nvptx64", nvptx64)
    .Case("le32", le32)
    .Case("amdil", amdil)
    .Case("spir", spir)
    .Default(UnknownArch);
}

Triple::ArchType Triple::getArchTypeForDarwinArchName(StringRef Str) {
  // See arch(3) and llvm-gcc's driver-driver.c. We don't implement support for
  // archs which Darwin doesn't use.

  // The matching this routine does is fairly pointless, since it is neither the
  // complete architecture list, nor a reasonable subset. The problem is that
  // historically the driver driver accepts this and also ties its -march=
  // handling to the architecture name, so we need to be careful before removing
  // support for it.

  // This code must be kept in sync with Clang's Darwin specific argument
  // translation.

  return StringSwitch<ArchType>(Str)
    .Cases("ppc", "ppc601", "ppc603", "ppc604", "ppc604e", Triple::ppc)
    .Cases("ppc750", "ppc7400", "ppc7450", "ppc970", Triple::ppc)
    .Case("ppc64", Triple::ppc64)
    .Cases("i386", "i486", "i486SX", "i586", "i686", Triple::x86)
    .Cases("pentium", "pentpro", "pentIIm3", "pentIIm5", "pentium4",
           Triple::x86)
    .Case("x86_64", Triple::x86_64)
    // This is derived from the driver driver.
    .Cases("arm", "armv4t", "armv5", "armv6", Triple::arm)
    .Cases("armv7", "armv7f", "armv7k", "armv7s", "xscale", Triple::arm)
    .Case("r600", Triple::r600)
    .Case("nvptx", Triple::nvptx)
    .Case("nvptx64", Triple::nvptx64)
    .Case("amdil", Triple::amdil)
    .Case("spir", Triple::spir)
    .Default(Triple::UnknownArch);
}

// Returns architecture name that is understood by the target assembler.
const char *Triple::getArchNameForAssembler() {
  if (!isOSDarwin() && getVendor() != Triple::Apple)
    return NULL;

  return StringSwitch<const char*>(getArchName())
    .Case("i386", "i386")
    .Case("x86_64", "x86_64")
    .Case("powerpc", "ppc")
    .Case("powerpc64", "ppc64")
    .Cases("mblaze", "microblaze", "mblaze")
    .Case("arm", "arm")
    .Cases("armv4t", "thumbv4t", "armv4t")
    .Cases("armv5", "armv5e", "thumbv5", "thumbv5e", "armv5")
    .Cases("armv6", "thumbv6", "armv6")
    .Cases("armv7", "thumbv7", "armv7")
    .Case("r600", "r600")
    .Case("nvptx", "nvptx")
    .Case("nvptx64", "nvptx64")
    .Case("le32", "le32")
    .Case("amdil", "amdil")
    .Case("spir", "spir")
    .Default(NULL);
}

static Triple::ArchType parseArch(StringRef ArchName) {
  return StringSwitch<Triple::ArchType>(ArchName)
    .Cases("i386", "i486", "i586", "i686", Triple::x86)
    // FIXME: Do we need to support these?
    .Cases("i786", "i886", "i986", Triple::x86)
    .Cases("amd64", "x86_64", Triple::x86_64)
    .Case("powerpc", Triple::ppc)
    .Cases("powerpc64", "ppu", Triple::ppc64)
    .Case("mblaze", Triple::mblaze)
    .Cases("arm", "xscale", Triple::arm)
    // FIXME: It would be good to replace these with explicit names for all the
    // various suffixes supported.
    .StartsWith("armv", Triple::arm)
    .Case("thumb", Triple::thumb)
    .StartsWith("thumbv", Triple::thumb)
    .Cases("spu", "cellspu", Triple::cellspu)
    .Case("msp430", Triple::msp430)
    .Cases("mips", "mipseb", "mipsallegrex", Triple::mips)
    .Cases("mipsel", "mipsallegrexel", Triple::mipsel)
    .Cases("mips64", "mips64eb", Triple::mips64)
    .Case("mips64el", Triple::mips64el)
    .Case("r600", Triple::r600)
    .Case("hexagon", Triple::hexagon)
    .Case("sparc", Triple::sparc)
    .Case("sparcv9", Triple::sparcv9)
    .Case("tce", Triple::tce)
    .Case("xcore", Triple::xcore)
    .Case("nvptx", Triple::nvptx)
    .Case("nvptx64", Triple::nvptx64)
    .Case("le32", Triple::le32)
    .Case("amdil", Triple::amdil)
    .Case("spir", Triple::spir)
    .Default(Triple::UnknownArch);
}

static Triple::VendorType parseVendor(StringRef VendorName) {
  return StringSwitch<Triple::VendorType>(VendorName)
    .Case("apple", Triple::Apple)
    .Case("pc", Triple::PC)
    .Case("scei", Triple::SCEI)
    .Case("bgp", Triple::BGP)
    .Case("bgq", Triple::BGQ)
    .Case("fsl", Triple::Freescale)
    .Case("ibm", Triple::IBM)
    .Default(Triple::UnknownVendor);
}

static Triple::OSType parseOS(StringRef OSName) {
  return StringSwitch<Triple::OSType>(OSName)
    .StartsWith("auroraux", Triple::AuroraUX)
    .StartsWith("cygwin", Triple::Cygwin)
    .StartsWith("darwin", Triple::Darwin)
    .StartsWith("dragonfly", Triple::DragonFly)
    .StartsWith("freebsd", Triple::FreeBSD)
    .StartsWith("ios", Triple::IOS)
    .StartsWith("kfreebsd", Triple::KFreeBSD)
    .StartsWith("linux", Triple::Linux)
    .StartsWith("lv2", Triple::Lv2)
    .StartsWith("macosx", Triple::MacOSX)
    .StartsWith("mingw32", Triple::MinGW32)
    .StartsWith("netbsd", Triple::NetBSD)
    .StartsWith("openbsd", Triple::OpenBSD)
    .StartsWith("solaris", Triple::Solaris)
    .StartsWith("win32", Triple::Win32)
    .StartsWith("haiku", Triple::Haiku)
    .StartsWith("minix", Triple::Minix)
    .StartsWith("rtems", Triple::RTEMS)
    .StartsWith("nacl", Triple::NativeClient)
    .StartsWith("cnk", Triple::CNK)
    .StartsWith("bitrig", Triple::Bitrig)
    .StartsWith("aix", Triple::AIX)
    .Default(Triple::UnknownOS);
}

static Triple::EnvironmentType parseEnvironment(StringRef EnvironmentName) {
  return StringSwitch<Triple::EnvironmentType>(EnvironmentName)
    .StartsWith("eabi", Triple::EABI)
    .StartsWith("gnueabihf", Triple::GNUEABIHF)
    .StartsWith("gnueabi", Triple::GNUEABI)
    .StartsWith("gnu", Triple::GNU)
    .StartsWith("macho", Triple::MachO)
    .StartsWith("android", Triple::Android)
    .StartsWith("elf", Triple::ELF)
    .Default(Triple::UnknownEnvironment);
}

/// \brief Construct a triple from the string representation provided.
///
/// This stores the string representation and parses the various pieces into
/// enum members.
Triple::Triple(const Twine &Str)
    : Data(Str.str()),
      Arch(parseArch(getArchName())),
      Vendor(parseVendor(getVendorName())),
      OS(parseOS(getOSName())),
      Environment(parseEnvironment(getEnvironmentName())) {
}

/// \brief Construct a triple from string representations of the architecture,
/// vendor, and OS.
///
/// This joins each argument into a canonical string representation and parses
/// them into enum members. It leaves the environment unknown and omits it from
/// the string representation.
Triple::Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr)
    : Data((ArchStr + Twine('-') + VendorStr + Twine('-') + OSStr).str()),
      Arch(parseArch(ArchStr.str())),
      Vendor(parseVendor(VendorStr.str())),
      OS(parseOS(OSStr.str())),
      Environment() {
}

/// \brief Construct a triple from string representations of the architecture,
/// vendor, OS, and environment.
///
/// This joins each argument into a canonical string representation and parses
/// them into enum members.
Triple::Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr,
               const Twine &EnvironmentStr)
    : Data((ArchStr + Twine('-') + VendorStr + Twine('-') + OSStr + Twine('-') +
            EnvironmentStr).str()),
      Arch(parseArch(ArchStr.str())),
      Vendor(parseVendor(VendorStr.str())),
      OS(parseOS(OSStr.str())),
      Environment(parseEnvironment(EnvironmentStr.str())) {
}

std::string Triple::normalize(StringRef Str) {
  // Parse into components.
  SmallVector<StringRef, 4> Components;
  Str.split(Components, "-");

  // If the first component corresponds to a known architecture, preferentially
  // use it for the architecture.  If the second component corresponds to a
  // known vendor, preferentially use it for the vendor, etc.  This avoids silly
  // component movement when a component parses as (eg) both a valid arch and a
  // valid os.
  ArchType Arch = UnknownArch;
  if (Components.size() > 0)
    Arch = parseArch(Components[0]);
  VendorType Vendor = UnknownVendor;
  if (Components.size() > 1)
    Vendor = parseVendor(Components[1]);
  OSType OS = UnknownOS;
  if (Components.size() > 2)
    OS = parseOS(Components[2]);
  EnvironmentType Environment = UnknownEnvironment;
  if (Components.size() > 3)
    Environment = parseEnvironment(Components[3]);

  // Note which components are already in their final position.  These will not
  // be moved.
  bool Found[4];
  Found[0] = Arch != UnknownArch;
  Found[1] = Vendor != UnknownVendor;
  Found[2] = OS != UnknownOS;
  Found[3] = Environment != UnknownEnvironment;

  // If they are not there already, permute the components into their canonical
  // positions by seeing if they parse as a valid architecture, and if so moving
  // the component to the architecture position etc.
  for (unsigned Pos = 0; Pos != array_lengthof(Found); ++Pos) {
    if (Found[Pos])
      continue; // Already in the canonical position.

    for (unsigned Idx = 0; Idx != Components.size(); ++Idx) {
      // Do not reparse any components that already matched.
      if (Idx < array_lengthof(Found) && Found[Idx])
        continue;

      // Does this component parse as valid for the target position?
      bool Valid = false;
      StringRef Comp = Components[Idx];
      switch (Pos) {
      default: llvm_unreachable("unexpected component type!");
      case 0:
        Arch = parseArch(Comp);
        Valid = Arch != UnknownArch;
        break;
      case 1:
        Vendor = parseVendor(Comp);
        Valid = Vendor != UnknownVendor;
        break;
      case 2:
        OS = parseOS(Comp);
        Valid = OS != UnknownOS;
        break;
      case 3:
        Environment = parseEnvironment(Comp);
        Valid = Environment != UnknownEnvironment;
        break;
      }
      if (!Valid)
        continue; // Nope, try the next component.

      // Move the component to the target position, pushing any non-fixed
      // components that are in the way to the right.  This tends to give
      // good results in the common cases of a forgotten vendor component
      // or a wrongly positioned environment.
      if (Pos < Idx) {
        // Insert left, pushing the existing components to the right.  For
        // example, a-b-i386 -> i386-a-b when moving i386 to the front.
        StringRef CurrentComponent(""); // The empty component.
        // Replace the component we are moving with an empty component.
        std::swap(CurrentComponent, Components[Idx]);
        // Insert the component being moved at Pos, displacing any existing
        // components to the right.
        for (unsigned i = Pos; !CurrentComponent.empty(); ++i) {
          // Skip over any fixed components.
          while (i < array_lengthof(Found) && Found[i])
            ++i;
          // Place the component at the new position, getting the component
          // that was at this position - it will be moved right.
          std::swap(CurrentComponent, Components[i]);
        }
      } else if (Pos > Idx) {
        // Push right by inserting empty components until the component at Idx
        // reaches the target position Pos.  For example, pc-a -> -pc-a when
        // moving pc to the second position.
        do {
          // Insert one empty component at Idx.
          StringRef CurrentComponent(""); // The empty component.
          for (unsigned i = Idx; i < Components.size();) {
            // Place the component at the new position, getting the component
            // that was at this position - it will be moved right.
            std::swap(CurrentComponent, Components[i]);
            // If it was placed on top of an empty component then we are done.
            if (CurrentComponent.empty())
              break;
            // Advance to the next component, skipping any fixed components.
            while (++i < array_lengthof(Found) && Found[i])
              ;
          }
          // The last component was pushed off the end - append it.
          if (!CurrentComponent.empty())
            Components.push_back(CurrentComponent);

          // Advance Idx to the component's new position.
          while (++Idx < array_lengthof(Found) && Found[Idx])
            ;
        } while (Idx < Pos); // Add more until the final position is reached.
      }
      assert(Pos < Components.size() && Components[Pos] == Comp &&
             "Component moved wrong!");
      Found[Pos] = true;
      break;
    }
  }

  // Special case logic goes here.  At this point Arch, Vendor and OS have the
  // correct values for the computed components.

  // Stick the corrected components back together to form the normalized string.
  std::string Normalized;
  for (unsigned i = 0, e = Components.size(); i != e; ++i) {
    if (i) Normalized += '-';
    Normalized += Components[i];
  }
  return Normalized;
}

StringRef Triple::getArchName() const {
  return StringRef(Data).split('-').first;           // Isolate first component
}

StringRef Triple::getVendorName() const {
  StringRef Tmp = StringRef(Data).split('-').second; // Strip first component
  return Tmp.split('-').first;                       // Isolate second component
}

StringRef Triple::getOSName() const {
  StringRef Tmp = StringRef(Data).split('-').second; // Strip first component
  Tmp = Tmp.split('-').second;                       // Strip second component
  return Tmp.split('-').first;                       // Isolate third component
}

StringRef Triple::getEnvironmentName() const {
  StringRef Tmp = StringRef(Data).split('-').second; // Strip first component
  Tmp = Tmp.split('-').second;                       // Strip second component
  return Tmp.split('-').second;                      // Strip third component
}

StringRef Triple::getOSAndEnvironmentName() const {
  StringRef Tmp = StringRef(Data).split('-').second; // Strip first component
  return Tmp.split('-').second;                      // Strip second component
}

static unsigned EatNumber(StringRef &Str) {
  assert(!Str.empty() && Str[0] >= '0' && Str[0] <= '9' && "Not a number");
  unsigned Result = 0;

  do {
    // Consume the leading digit.
    Result = Result*10 + (Str[0] - '0');

    // Eat the digit.
    Str = Str.substr(1);
  } while (!Str.empty() && Str[0] >= '0' && Str[0] <= '9');

  return Result;
}

void Triple::getOSVersion(unsigned &Major, unsigned &Minor,
                          unsigned &Micro) const {
  StringRef OSName = getOSName();

  // Assume that the OS portion of the triple starts with the canonical name.
  StringRef OSTypeName = getOSTypeName(getOS());
  if (OSName.startswith(OSTypeName))
    OSName = OSName.substr(OSTypeName.size());

  // Any unset version defaults to 0.
  Major = Minor = Micro = 0;

  // Parse up to three components.
  unsigned *Components[3] = { &Major, &Minor, &Micro };
  for (unsigned i = 0; i != 3; ++i) {
    if (OSName.empty() || OSName[0] < '0' || OSName[0] > '9')
      break;

    // Consume the leading number.
    *Components[i] = EatNumber(OSName);

    // Consume the separator, if present.
    if (OSName.startswith("."))
      OSName = OSName.substr(1);
  }
}

bool Triple::getMacOSXVersion(unsigned &Major, unsigned &Minor,
                              unsigned &Micro) const {
  getOSVersion(Major, Minor, Micro);

  switch (getOS()) {
  default: llvm_unreachable("unexpected OS for Darwin triple");
  case Darwin:
    // Default to darwin8, i.e., MacOSX 10.4.
    if (Major == 0)
      Major = 8;
    // Darwin version numbers are skewed from OS X versions.
    if (Major < 4)
      return false;
    Micro = 0;
    Minor = Major - 4;
    Major = 10;
    break;
  case MacOSX:
    // Default to 10.4.
    if (Major == 0) {
      Major = 10;
      Minor = 4;
    }
    if (Major != 10)
      return false;
    break;
  case IOS:
    // Ignore the version from the triple.  This is only handled because the
    // the clang driver combines OS X and IOS support into a common Darwin
    // toolchain that wants to know the OS X version number even when targeting
    // IOS.
    Major = 10;
    Minor = 4;
    Micro = 0;
    break;
  }
  return true;
}

void Triple::getiOSVersion(unsigned &Major, unsigned &Minor,
                           unsigned &Micro) const {
  switch (getOS()) {
  default: llvm_unreachable("unexpected OS for Darwin triple");
  case Darwin:
  case MacOSX:
    // Ignore the version from the triple.  This is only handled because the
    // the clang driver combines OS X and IOS support into a common Darwin
    // toolchain that wants to know the iOS version number even when targeting
    // OS X.
    Major = 3;
    Minor = 0;
    Micro = 0;
    break;
  case IOS:
    getOSVersion(Major, Minor, Micro);
    // Default to 3.0.
    if (Major == 0)
      Major = 3;
    break;
  }
}

void Triple::setTriple(const Twine &Str) {
  *this = Triple(Str);
}

void Triple::setArch(ArchType Kind) {
  setArchName(getArchTypeName(Kind));
}

void Triple::setVendor(VendorType Kind) {
  setVendorName(getVendorTypeName(Kind));
}

void Triple::setOS(OSType Kind) {
  setOSName(getOSTypeName(Kind));
}

void Triple::setEnvironment(EnvironmentType Kind) {
  setEnvironmentName(getEnvironmentTypeName(Kind));
}

void Triple::setArchName(StringRef Str) {
  // Work around a miscompilation bug for Twines in gcc 4.0.3.
  SmallString<64> Triple;
  Triple += Str;
  Triple += "-";
  Triple += getVendorName();
  Triple += "-";
  Triple += getOSAndEnvironmentName();
  setTriple(Triple.str());
}

void Triple::setVendorName(StringRef Str) {
  setTriple(getArchName() + "-" + Str + "-" + getOSAndEnvironmentName());
}

void Triple::setOSName(StringRef Str) {
  if (hasEnvironment())
    setTriple(getArchName() + "-" + getVendorName() + "-" + Str +
              "-" + getEnvironmentName());
  else
    setTriple(getArchName() + "-" + getVendorName() + "-" + Str);
}

void Triple::setEnvironmentName(StringRef Str) {
  setTriple(getArchName() + "-" + getVendorName() + "-" + getOSName() +
            "-" + Str);
}

void Triple::setOSAndEnvironmentName(StringRef Str) {
  setTriple(getArchName() + "-" + getVendorName() + "-" + Str);
}

static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
  switch (Arch) {
  case llvm::Triple::spir:
  case llvm::Triple::UnknownArch:
    return 0;

  case llvm::Triple::msp430:
    return 16;

  case llvm::Triple::amdil:
  case llvm::Triple::arm:
  case llvm::Triple::cellspu:
  case llvm::Triple::hexagon:
  case llvm::Triple::le32:
  case llvm::Triple::mblaze:
  case llvm::Triple::mips:
  case llvm::Triple::mipsel:
  case llvm::Triple::nvptx:
  case llvm::Triple::ppc:
  case llvm::Triple::r600:
  case llvm::Triple::sparc:
  case llvm::Triple::tce:
  case llvm::Triple::thumb:
  case llvm::Triple::x86:
  case llvm::Triple::xcore:
    return 32;

  case llvm::Triple::mips64:
  case llvm::Triple::mips64el:
  case llvm::Triple::nvptx64:
  case llvm::Triple::ppc64:
  case llvm::Triple::sparcv9:
  case llvm::Triple::x86_64:
    return 64;
  }
  llvm_unreachable("Invalid architecture value");
}

bool Triple::isArch64Bit() const {
  return getArchPointerBitWidth(getArch()) == 64;
}

bool Triple::isArch32Bit() const {
  return getArchPointerBitWidth(getArch()) == 32;
}

bool Triple::isArch16Bit() const {
  return getArchPointerBitWidth(getArch()) == 16;
}

Triple Triple::get32BitArchVariant() const {
  Triple T(*this);
  switch (getArch()) {
  case Triple::UnknownArch:
  case Triple::msp430:
    T.setArch(UnknownArch);
    break;

  case Triple::amdil:
  case Triple::spir:
  case Triple::arm:
  case Triple::cellspu:
  case Triple::hexagon:
  case Triple::le32:
  case Triple::mblaze:
  case Triple::mips:
  case Triple::mipsel:
  case Triple::nvptx:
  case Triple::ppc:
  case Triple::r600:
  case Triple::sparc:
  case Triple::tce:
  case Triple::thumb:
  case Triple::x86:
  case Triple::xcore:
    // Already 32-bit.
    break;

  case Triple::mips64:    T.setArch(Triple::mips);    break;
  case Triple::mips64el:  T.setArch(Triple::mipsel);  break;
  case Triple::nvptx64:   T.setArch(Triple::nvptx);   break;
  case Triple::ppc64:     T.setArch(Triple::ppc);   break;
  case Triple::sparcv9:   T.setArch(Triple::sparc);   break;
  case Triple::x86_64:    T.setArch(Triple::x86);     break;
  }
  return T;
}

Triple Triple::get64BitArchVariant() const {
  Triple T(*this);
  switch (getArch()) {
  case Triple::UnknownArch:
  case Triple::amdil:
  case Triple::arm:
  case Triple::cellspu:
  case Triple::hexagon:
  case Triple::le32:
  case Triple::mblaze:
  case Triple::msp430:
  case Triple::r600:
  case Triple::tce:
  case Triple::thumb:
  case Triple::xcore:
    T.setArch(UnknownArch);
    break;

  case Triple::spir:
  case Triple::mips64:
  case Triple::mips64el:
  case Triple::nvptx64:
  case Triple::ppc64:
  case Triple::sparcv9:
  case Triple::x86_64:
    // Already 64-bit.
    break;

  case Triple::mips:    T.setArch(Triple::mips64);    break;
  case Triple::mipsel:  T.setArch(Triple::mips64el);  break;
  case Triple::nvptx:   T.setArch(Triple::nvptx64);   break;
  case Triple::ppc:     T.setArch(Triple::ppc64);     break;
  case Triple::sparc:   T.setArch(Triple::sparcv9);   break;
  case Triple::x86:     T.setArch(Triple::x86_64);    break;
  }
  return T;
}