aboutsummaryrefslogtreecommitdiffstats
path: root/lib/Target/PowerPC/PPCAsmPrinter.cpp
blob: 13272908b12ec16570ac77ec8747c5435fde347d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to PowerPC assembly language. This printer is
// the output mechanism used by `llc'.
//
// Documentation at http://developer.apple.com/documentation/DeveloperTools/
// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
//
//===----------------------------------------------------------------------===//

#include "PPC.h"
#include "InstPrinter/PPCInstPrinter.h"
#include "MCTargetDesc/PPCMCExpr.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCSubtarget.h"
#include "PPCTargetMachine.h"
#include "PPCTargetStreamer.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/StackMaps.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;

#define DEBUG_TYPE "asmprinter"

namespace {
  class PPCAsmPrinter : public AsmPrinter {
  protected:
    MapVector<MCSymbol*, MCSymbol*> TOC;
    const PPCSubtarget *Subtarget;
    uint64_t TOCLabelID;
    StackMaps SM;
  public:
    explicit PPCAsmPrinter(TargetMachine &TM,
                           std::unique_ptr<MCStreamer> Streamer)
        : AsmPrinter(TM, std::move(Streamer)), TOCLabelID(0), SM(*this) {}

    const char *getPassName() const override {
      return "PowerPC Assembly Printer";
    }

    MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);

    void EmitInstruction(const MachineInstr *MI) override;

    void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);

    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                         unsigned AsmVariant, const char *ExtraCode,
                         raw_ostream &O) override;
    bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
                               unsigned AsmVariant, const char *ExtraCode,
                               raw_ostream &O) override;

    void EmitEndOfAsmFile(Module &M) override;

    void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
                       const MachineInstr &MI);
    void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
                         const MachineInstr &MI);
    void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
    bool runOnMachineFunction(MachineFunction &MF) override {
      Subtarget = &MF.getSubtarget<PPCSubtarget>();
      return AsmPrinter::runOnMachineFunction(MF);
    }
  };

  /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
  class PPCLinuxAsmPrinter : public PPCAsmPrinter {
  public:
    explicit PPCLinuxAsmPrinter(TargetMachine &TM,
                                std::unique_ptr<MCStreamer> Streamer)
        : PPCAsmPrinter(TM, std::move(Streamer)) {}

    const char *getPassName() const override {
      return "Linux PPC Assembly Printer";
    }

    bool doFinalization(Module &M) override;
    void EmitStartOfAsmFile(Module &M) override;

    void EmitFunctionEntryLabel() override;

    void EmitFunctionBodyStart() override;
    void EmitFunctionBodyEnd() override;
  };

  /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
  /// OS X
  class PPCDarwinAsmPrinter : public PPCAsmPrinter {
  public:
    explicit PPCDarwinAsmPrinter(TargetMachine &TM,
                                 std::unique_ptr<MCStreamer> Streamer)
        : PPCAsmPrinter(TM, std::move(Streamer)) {}

    const char *getPassName() const override {
      return "Darwin PPC Assembly Printer";
    }

    bool doFinalization(Module &M) override;
    void EmitStartOfAsmFile(Module &M) override;

    void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
  };
} // end of anonymous namespace

/// stripRegisterPrefix - This method strips the character prefix from a
/// register name so that only the number is left.  Used by for linux asm.
static const char *stripRegisterPrefix(const char *RegName) {
  switch (RegName[0]) {
    case 'r':
    case 'f':
    case 'q': // for QPX
    case 'v':
      if (RegName[1] == 's')
        return RegName + 2;
      return RegName + 1;
    case 'c': if (RegName[1] == 'r') return RegName + 2;
  }
  
  return RegName;
}

void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
                                 raw_ostream &O) {
  const DataLayout *DL = TM.getDataLayout();
  const MachineOperand &MO = MI->getOperand(OpNo);
  
  switch (MO.getType()) {
  case MachineOperand::MO_Register: {
    const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
    // Linux assembler (Others?) does not take register mnemonics.
    // FIXME - What about special registers used in mfspr/mtspr?
    if (!Subtarget->isDarwin())
      RegName = stripRegisterPrefix(RegName);
    O << RegName;
    return;
  }
  case MachineOperand::MO_Immediate:
    O << MO.getImm();
    return;

  case MachineOperand::MO_MachineBasicBlock:
    O << *MO.getMBB()->getSymbol();
    return;
  case MachineOperand::MO_ConstantPoolIndex:
    O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
      << '_' << MO.getIndex();
    return;
  case MachineOperand::MO_BlockAddress:
    O << *GetBlockAddressSymbol(MO.getBlockAddress());
    return;
  case MachineOperand::MO_GlobalAddress: {
    // Computing the address of a global symbol, not calling it.
    const GlobalValue *GV = MO.getGlobal();
    MCSymbol *SymToPrint;

    // External or weakly linked global variables need non-lazily-resolved stubs
    if (TM.getRelocationModel() != Reloc::Static &&
        (GV->isDeclaration() || GV->isWeakForLinker())) {
      if (!GV->hasHiddenVisibility()) {
        SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
        MachineModuleInfoImpl::StubValueTy &StubSym = 
          MMI->getObjFileInfo<MachineModuleInfoMachO>()
            .getGVStubEntry(SymToPrint);
        if (!StubSym.getPointer())
          StubSym = MachineModuleInfoImpl::
            StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
      } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
                 GV->hasAvailableExternallyLinkage()) {
        SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
        
        MachineModuleInfoImpl::StubValueTy &StubSym = 
          MMI->getObjFileInfo<MachineModuleInfoMachO>().
                    getHiddenGVStubEntry(SymToPrint);
        if (!StubSym.getPointer())
          StubSym = MachineModuleInfoImpl::
            StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
      } else {
        SymToPrint = getSymbol(GV);
      }
    } else {
      SymToPrint = getSymbol(GV);
    }
    
    O << *SymToPrint;

    printOffset(MO.getOffset(), O);
    return;
  }

  default:
    O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
    return;
  }
}

/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                                    unsigned AsmVariant,
                                    const char *ExtraCode, raw_ostream &O) {
  // Does this asm operand have a single letter operand modifier?
  if (ExtraCode && ExtraCode[0]) {
    if (ExtraCode[1] != 0) return true; // Unknown modifier.

    switch (ExtraCode[0]) {
    default:
      // See if this is a generic print operand
      return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
    case 'c': // Don't print "$" before a global var name or constant.
      break; // PPC never has a prefix.
    case 'L': // Write second word of DImode reference.
      // Verify that this operand has two consecutive registers.
      if (!MI->getOperand(OpNo).isReg() ||
          OpNo+1 == MI->getNumOperands() ||
          !MI->getOperand(OpNo+1).isReg())
        return true;
      ++OpNo;   // Return the high-part.
      break;
    case 'I':
      // Write 'i' if an integer constant, otherwise nothing.  Used to print
      // addi vs add, etc.
      if (MI->getOperand(OpNo).isImm())
        O << "i";
      return false;
    }
  }

  printOperand(MI, OpNo, O);
  return false;
}

// At the moment, all inline asm memory operands are a single register.
// In any case, the output of this routine should always be just one
// assembler operand.

bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
                                          unsigned AsmVariant,
                                          const char *ExtraCode,
                                          raw_ostream &O) {
  if (ExtraCode && ExtraCode[0]) {
    if (ExtraCode[1] != 0) return true; // Unknown modifier.

    switch (ExtraCode[0]) {
    default: return true;  // Unknown modifier.
    case 'y': // A memory reference for an X-form instruction
      {
        const char *RegName = "r0";
        if (!Subtarget->isDarwin())
          RegName = stripRegisterPrefix(RegName);
        O << RegName << ", ";
        printOperand(MI, OpNo, O);
        return false;
      }
    case 'U': // Print 'u' for update form.
    case 'X': // Print 'x' for indexed form.
      {
	// FIXME: Currently for PowerPC memory operands are always loaded
	// into a register, so we never get an update or indexed form.
	// This is bad even for offset forms, since even if we know we
	// have a value in -16(r1), we will generate a load into r<n>
	// and then load from 0(r<n>).  Until that issue is fixed,
	// tolerate 'U' and 'X' but don't output anything.
	assert(MI->getOperand(OpNo).isReg());
	return false;
      }
    }
  }

  assert(MI->getOperand(OpNo).isReg());
  O << "0(";
  printOperand(MI, OpNo, O);
  O << ")";
  return false;
}


/// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
/// exists for it.  If not, create one.  Then return a symbol that references
/// the TOC entry.
MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
  const DataLayout *DL = TM.getDataLayout();
  MCSymbol *&TOCEntry = TOC[Sym];

  // To avoid name clash check if the name already exists.
  while (!TOCEntry) {
    if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
                                "C" + Twine(TOCLabelID++)) == nullptr) {
      TOCEntry = GetTempSymbol("C", TOCLabelID);
    }
  }

  return TOCEntry;
}

void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
  SM.serializeToStackMapSection();
}

void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
                                  const MachineInstr &MI) {
  unsigned NumNOPBytes = MI.getOperand(1).getImm();

  SM.recordStackMap(MI);
  assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");

  // Scan ahead to trim the shadow.
  const MachineBasicBlock &MBB = *MI.getParent();
  MachineBasicBlock::const_iterator MII(MI);
  ++MII;
  while (NumNOPBytes > 0) {
    if (MII == MBB.end() || MII->isCall() ||
        MII->getOpcode() == PPC::DBG_VALUE ||
        MII->getOpcode() == TargetOpcode::PATCHPOINT ||
        MII->getOpcode() == TargetOpcode::STACKMAP)
      break;
    ++MII;
    NumNOPBytes -= 4;
  }

  // Emit nops.
  for (unsigned i = 0; i < NumNOPBytes; i += 4)
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
}

// Lower a patchpoint of the form:
// [<def>], <id>, <numBytes>, <target>, <numArgs>
void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
                                    const MachineInstr &MI) {
  SM.recordPatchPoint(MI);
  PatchPointOpers Opers(&MI);

  int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
  unsigned EncodedBytes = 0;
  if (CallTarget) {
    assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
           "High 16 bits of call target should be zero.");
    unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
    EncodedBytes = 6*4;
    // Materialize the jump address:
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
                                    .addReg(ScratchReg)
                                    .addImm((CallTarget >> 32) & 0xFFFF));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
                                    .addReg(ScratchReg)
                                    .addReg(ScratchReg)
                                    .addImm(32).addImm(16));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
                                    .addReg(ScratchReg)
                                    .addReg(ScratchReg)
                                    .addImm((CallTarget >> 16) & 0xFFFF));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
                                    .addReg(ScratchReg)
                                    .addReg(ScratchReg)
                                    .addImm(CallTarget & 0xFFFF));

    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
  }

  // Emit padding.
  unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
  assert(NumBytes >= EncodedBytes &&
         "Patchpoint can't request size less than the length of a call.");
  assert((NumBytes - EncodedBytes) % 4 == 0 &&
         "Invalid number of NOP bytes requested!");
  for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
}

/// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
/// call to __tls_get_addr to the current output stream.
void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
                                MCSymbolRefExpr::VariantKind VK) {
  StringRef Name = "__tls_get_addr";
  MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
  MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;

  assert(MI->getOperand(0).isReg() &&
         ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
          (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
         "GETtls[ld]ADDR[32] must define GPR3");
  assert(MI->getOperand(1).isReg() &&
         ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
          (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
         "GETtls[ld]ADDR[32] must read GPR3");

  if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
      TM.getRelocationModel() == Reloc::PIC_)
    Kind = MCSymbolRefExpr::VK_PLT;
  const MCSymbolRefExpr *TlsRef =
    MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
  const MachineOperand &MO = MI->getOperand(2);
  const GlobalValue *GValue = MO.getGlobal();
  MCSymbol *MOSymbol = getSymbol(GValue);
  const MCExpr *SymVar = MCSymbolRefExpr::Create(MOSymbol, VK, OutContext);
  EmitToStreamer(OutStreamer,
                 MCInstBuilder(Subtarget->isPPC64() ?
                               PPC::BL8_NOP_TLS : PPC::BL_TLS)
                 .addExpr(TlsRef)
                 .addExpr(SymVar));
}

/// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
/// the current output stream.
///
void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
  MCInst TmpInst;
  bool isPPC64 = Subtarget->isPPC64();
  bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
  const Module *M = MF->getFunction()->getParent();
  PICLevel::Level PL = M->getPICLevel();
  
  // Lower multi-instruction pseudo operations.
  switch (MI->getOpcode()) {
  default: break;
  case TargetOpcode::DBG_VALUE:
    llvm_unreachable("Should be handled target independently");
  case TargetOpcode::STACKMAP:
    return LowerSTACKMAP(OutStreamer, SM, *MI);
  case TargetOpcode::PATCHPOINT:
    return LowerPATCHPOINT(OutStreamer, SM, *MI);

  case PPC::MoveGOTtoLR: {
    // Transform %LR = MoveGOTtoLR
    // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
    // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
    // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
    //      blrl
    // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
    MCSymbol *GOTSymbol =
      OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
    const MCExpr *OffsExpr =
      MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
                                                      MCSymbolRefExpr::VK_PPC_LOCAL,
                                                      OutContext),
                              MCConstantExpr::Create(4, OutContext),
                              OutContext);

    // Emit the 'bl'.
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
    return;
  }
  case PPC::MovePCtoLR:
  case PPC::MovePCtoLR8: {
    // Transform %LR = MovePCtoLR
    // Into this, where the label is the PIC base: 
    //     bl L1$pb
    // L1$pb:
    MCSymbol *PICBase = MF->getPICBaseSymbol();
    
    // Emit the 'bl'.
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
      // FIXME: We would like an efficient form for this, so we don't have to do
      // a lot of extra uniquing.
      .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
    
    // Emit the label.
    OutStreamer.EmitLabel(PICBase);
    return;
  }
  case PPC::UpdateGBR: {
    // Transform %Rd = UpdateGBR(%Rt, %Ri)
    // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
    //       add %Rd, %Rt, %Ri
    // Get the offset from the GOT Base Register to the GOT
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
    MCSymbol *PICOffset =
      MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
    TmpInst.setOpcode(PPC::LWZ);
    const MCExpr *Exp =
      MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
    const MCExpr *PB =
      MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
                              MCSymbolRefExpr::VK_None,
                              OutContext);
    const MCOperand TR = TmpInst.getOperand(1);
    const MCOperand PICR = TmpInst.getOperand(0);

    // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
    TmpInst.getOperand(1) =
        MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
    TmpInst.getOperand(0) = TR;
    TmpInst.getOperand(2) = PICR;
    EmitToStreamer(OutStreamer, TmpInst);

    TmpInst.setOpcode(PPC::ADD4);
    TmpInst.getOperand(0) = PICR;
    TmpInst.getOperand(1) = TR;
    TmpInst.getOperand(2) = PICR;
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
  case PPC::LWZtoc: {
    // Transform %R3 = LWZtoc <ga:@min1>, %R2
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to LWZ, and the global address operand to be a
    // reference to the GOT entry we will synthesize later.
    TmpInst.setOpcode(PPC::LWZ);
    const MachineOperand &MO = MI->getOperand(1);

    // Map symbol -> label of TOC entry
    assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
    MCSymbol *MOSymbol = nullptr;
    if (MO.isGlobal())
      MOSymbol = getSymbol(MO.getGlobal());
    else if (MO.isCPI())
      MOSymbol = GetCPISymbol(MO.getIndex());
    else if (MO.isJTI())
      MOSymbol = GetJTISymbol(MO.getIndex());
    else if (MO.isBlockAddress())
      MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());

    if (PL == PICLevel::Small) {
      const MCExpr *Exp =
        MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
                                OutContext);
      TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
    } else {
      MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);

      const MCExpr *Exp =
        MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
                                OutContext);
      const MCExpr *PB =
        MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
                                                             OutContext);
      Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
      TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
    }
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
  case PPC::LDtocJTI:
  case PPC::LDtocCPT:
  case PPC::LDtocBA:
  case PPC::LDtoc: {
    // Transform %X3 = LDtoc <ga:@min1>, %X2
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to LD, and the global address operand to be a
    // reference to the TOC entry we will synthesize later.
    TmpInst.setOpcode(PPC::LD);
    const MachineOperand &MO = MI->getOperand(1);

    // Map symbol -> label of TOC entry
    assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
    MCSymbol *MOSymbol = nullptr;
    if (MO.isGlobal())
      MOSymbol = getSymbol(MO.getGlobal());
    else if (MO.isCPI())
      MOSymbol = GetCPISymbol(MO.getIndex());
    else if (MO.isJTI())
      MOSymbol = GetJTISymbol(MO.getIndex());
    else if (MO.isBlockAddress())
      MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());

    MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);

    const MCExpr *Exp =
      MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
                              OutContext);
    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
      
  case PPC::ADDIStocHA: {
    // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to ADDIS8.  If the global address is external, has
    // common linkage, is a non-local function address, or is a jump table
    // address, then generate a TOC entry and reference that.  Otherwise
    // reference the symbol directly.
    TmpInst.setOpcode(PPC::ADDIS8);
    const MachineOperand &MO = MI->getOperand(2);
    assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
            MO.isBlockAddress()) &&
           "Invalid operand for ADDIStocHA!");
    MCSymbol *MOSymbol = nullptr;
    bool IsExternal = false;
    bool IsNonLocalFunction = false;
    bool IsCommon = false;
    bool IsAvailExt = false;

    if (MO.isGlobal()) {
      const GlobalValue *GV = MO.getGlobal();
      MOSymbol = getSymbol(GV);
      IsExternal = GV->isDeclaration();
      IsCommon = GV->hasCommonLinkage();
      IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
        (GV->isDeclaration() || GV->isWeakForLinker());
      IsAvailExt = GV->hasAvailableExternallyLinkage();
    } else if (MO.isCPI())
      MOSymbol = GetCPISymbol(MO.getIndex());
    else if (MO.isJTI())
      MOSymbol = GetJTISymbol(MO.getIndex());
    else if (MO.isBlockAddress())
      MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());

    if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
        MO.isJTI() || MO.isBlockAddress() ||
        TM.getCodeModel() == CodeModel::Large)
      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);

    const MCExpr *Exp =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
                              OutContext);
    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
  case PPC::LDtocL: {
    // Transform %Xd = LDtocL <ga:@sym>, %Xs
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to LD.  If the global address is external, has
    // common linkage, or is a jump table address, then reference the
    // associated TOC entry.  Otherwise reference the symbol directly.
    TmpInst.setOpcode(PPC::LD);
    const MachineOperand &MO = MI->getOperand(1);
    assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
            MO.isBlockAddress()) &&
           "Invalid operand for LDtocL!");
    MCSymbol *MOSymbol = nullptr;

    if (MO.isJTI())
      MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
    else if (MO.isBlockAddress()) {
      MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
    }
    else if (MO.isCPI()) {
      MOSymbol = GetCPISymbol(MO.getIndex());
      if (TM.getCodeModel() == CodeModel::Large)
        MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
    }
    else if (MO.isGlobal()) {
      const GlobalValue *GValue = MO.getGlobal();
      MOSymbol = getSymbol(GValue);
      if (GValue->getType()->getElementType()->isFunctionTy() ||
          GValue->isDeclaration() || GValue->hasCommonLinkage() ||
          GValue->hasAvailableExternallyLinkage() ||
          TM.getCodeModel() == CodeModel::Large)
        MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
    }

    const MCExpr *Exp =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
                              OutContext);
    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
  case PPC::ADDItocL: {
    // Transform %Xd = ADDItocL %Xs, <ga:@sym>
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to ADDI8.  If the global address is external, then
    // generate a TOC entry and reference that.  Otherwise reference the
    // symbol directly.
    TmpInst.setOpcode(PPC::ADDI8);
    const MachineOperand &MO = MI->getOperand(2);
    assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
    MCSymbol *MOSymbol = nullptr;
    bool IsExternal = false;
    bool IsNonLocalFunction = false;

    if (MO.isGlobal()) {
      const GlobalValue *GV = MO.getGlobal();
      MOSymbol = getSymbol(GV);
      IsExternal = GV->isDeclaration();
      IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
        (GV->isDeclaration() || GV->isWeakForLinker());
    } else if (MO.isCPI())
      MOSymbol = GetCPISymbol(MO.getIndex());

    if (IsNonLocalFunction || IsExternal ||
        TM.getCodeModel() == CodeModel::Large)
      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);

    const MCExpr *Exp =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
                              OutContext);
    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }
  case PPC::ADDISgotTprelHA: {
    // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
    assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymGotTprel =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
                              OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
                                .addReg(MI->getOperand(0).getReg())
                                .addReg(MI->getOperand(1).getReg())
                                .addExpr(SymGotTprel));
    return;
  }
  case PPC::LDgotTprelL:
  case PPC::LDgotTprelL32: {
    // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);

    // Change the opcode to LD.
    TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
    const MachineOperand &MO = MI->getOperand(1);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *Exp =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
                              OutContext);
    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
    EmitToStreamer(OutStreamer, TmpInst);
    return;
  }

  case PPC::PPC32PICGOT: {
    MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
    MCSymbol *GOTRef = OutContext.CreateTempSymbol();
    MCSymbol *NextInstr = OutContext.CreateTempSymbol();

    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
      // FIXME: We would like an efficient form for this, so we don't have to do
      // a lot of extra uniquing.
      .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
    const MCExpr *OffsExpr =
      MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
                                MCSymbolRefExpr::Create(GOTRef, OutContext),
        OutContext);
    OutStreamer.EmitLabel(GOTRef);
    OutStreamer.EmitValue(OffsExpr, 4);
    OutStreamer.EmitLabel(NextInstr);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
                                .addReg(MI->getOperand(0).getReg()));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
                                .addReg(MI->getOperand(1).getReg())
                                .addImm(0)
                                .addReg(MI->getOperand(0).getReg()));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
                                .addReg(MI->getOperand(0).getReg())
                                .addReg(MI->getOperand(1).getReg())
                                .addReg(MI->getOperand(0).getReg()));
    return;
  }
  case PPC::PPC32GOT: {
    MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
    const MCExpr *SymGotTlsL =
      MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
                              OutContext);
    const MCExpr *SymGotTlsHA =                               
      MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
                              OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
                                .addReg(MI->getOperand(0).getReg())
                                .addExpr(SymGotTlsL));
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
                                .addReg(MI->getOperand(0).getReg())
                                .addReg(MI->getOperand(0).getReg())
                                .addExpr(SymGotTlsHA));
    return;
  }
  case PPC::ADDIStlsgdHA: {
    // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
    assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymGotTlsGD =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
                              OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
                                .addReg(MI->getOperand(0).getReg())
                                .addReg(MI->getOperand(1).getReg())
                                .addExpr(SymGotTlsGD));
    return;
  }
  case PPC::ADDItlsgdL:
    // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsgd@l
  case PPC::ADDItlsgdL32: {
    // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
    // Into:      %Rd = ADDI %Rs, sym@got@tlsgd
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymGotTlsGD = MCSymbolRefExpr::Create(
        MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
                                       : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
        OutContext);
    EmitToStreamer(OutStreamer,
                   MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
                   .addReg(MI->getOperand(0).getReg())
                   .addReg(MI->getOperand(1).getReg())
                   .addExpr(SymGotTlsGD));
    return;
  }
  case PPC::GETtlsADDR:
    // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
    // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
  case PPC::GETtlsADDR32: {
    // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
    // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
    EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
    return;
  }
  case PPC::ADDIStlsldHA: {
    // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
    assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymGotTlsLD =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
                              OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
                                .addReg(MI->getOperand(0).getReg())
                                .addReg(MI->getOperand(1).getReg())
                                .addExpr(SymGotTlsLD));
    return;
  }
  case PPC::ADDItlsldL:
    // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsld@l
  case PPC::ADDItlsldL32: {
    // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
    // Into:      %Rd = ADDI %Rs, sym@got@tlsld
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymGotTlsLD = MCSymbolRefExpr::Create(
        MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
                                       : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
        OutContext);
    EmitToStreamer(OutStreamer,
                   MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
                       .addReg(MI->getOperand(0).getReg())
                       .addReg(MI->getOperand(1).getReg())
                       .addExpr(SymGotTlsLD));
    return;
  }
  case PPC::GETtlsldADDR:
    // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
    // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
  case PPC::GETtlsldADDR32: {
    // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
    // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
    EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
    return;
  }
  case PPC::ADDISdtprelHA:
    // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
    // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
  case PPC::ADDISdtprelHA32: {
    // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
    // Into:      %Rd = ADDIS %R3, sym@dtprel@ha
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymDtprel =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
                              OutContext);
    EmitToStreamer(
        OutStreamer,
        MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
            .addReg(MI->getOperand(0).getReg())
            .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
            .addExpr(SymDtprel));
    return;
  }
  case PPC::ADDIdtprelL:
    // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
    // Into:      %Xd = ADDI8 %Xs, sym@dtprel@l
  case PPC::ADDIdtprelL32: {
    // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
    // Into:      %Rd = ADDI %Rs, sym@dtprel@l
    const MachineOperand &MO = MI->getOperand(2);
    const GlobalValue *GValue = MO.getGlobal();
    MCSymbol *MOSymbol = getSymbol(GValue);
    const MCExpr *SymDtprel =
      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
                              OutContext);
    EmitToStreamer(OutStreamer,
                   MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
                       .addReg(MI->getOperand(0).getReg())
                       .addReg(MI->getOperand(1).getReg())
                       .addExpr(SymDtprel));
    return;
  }
  case PPC::MFOCRF:
  case PPC::MFOCRF8:
    if (!Subtarget->hasMFOCRF()) {
      // Transform: %R3 = MFOCRF %CR7
      // Into:      %R3 = MFCR   ;; cr7
      unsigned NewOpcode =
        MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
      OutStreamer.AddComment(PPCInstPrinter::
                             getRegisterName(MI->getOperand(1).getReg()));
      EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
                                  .addReg(MI->getOperand(0).getReg()));
      return;
    }
    break;
  case PPC::MTOCRF:
  case PPC::MTOCRF8:
    if (!Subtarget->hasMFOCRF()) {
      // Transform: %CR7 = MTOCRF %R3
      // Into:      MTCRF mask, %R3 ;; cr7
      unsigned NewOpcode =
        MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
      unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
                              ->getEncodingValue(MI->getOperand(0).getReg());
      OutStreamer.AddComment(PPCInstPrinter::
                             getRegisterName(MI->getOperand(0).getReg()));
      EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
                                  .addImm(Mask)
                                  .addReg(MI->getOperand(1).getReg()));
      return;
    }
    break;
  case PPC::LD:
  case PPC::STD:
  case PPC::LWA_32:
  case PPC::LWA: {
    // Verify alignment is legal, so we don't create relocations
    // that can't be supported.
    // FIXME:  This test is currently disabled for Darwin.  The test
    // suite shows a handful of test cases that fail this check for
    // Darwin.  Those need to be investigated before this sanity test
    // can be enabled for those subtargets.
    if (!Subtarget->isDarwin()) {
      unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
      const MachineOperand &MO = MI->getOperand(OpNum);
      if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
        llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
    }
    // Now process the instruction normally.
    break;
  }
  }

  LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
  EmitToStreamer(OutStreamer, TmpInst);
}

void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
  if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
    PPCTargetStreamer *TS =
      static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());

    if (TS)
      TS->emitAbiVersion(2);
  }

  if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
      TM.getRelocationModel() != Reloc::PIC_)
    return AsmPrinter::EmitStartOfAsmFile(M);

  if (M.getPICLevel() == PICLevel::Small)
    return AsmPrinter::EmitStartOfAsmFile(M);

  OutStreamer.SwitchSection(OutContext.getELFSection(
      ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));

  MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
  MCSymbol *CurrentPos = OutContext.CreateTempSymbol();

  OutStreamer.EmitLabel(CurrentPos);

  // The GOT pointer points to the middle of the GOT, in order to reference the
  // entire 64kB range.  0x8000 is the midpoint.
  const MCExpr *tocExpr =
    MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
                            MCConstantExpr::Create(0x8000, OutContext),
                            OutContext);

  OutStreamer.EmitAssignment(TOCSym, tocExpr);

  OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
}

void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
  // linux/ppc32 - Normal entry label.
  if (!Subtarget->isPPC64() && 
      (TM.getRelocationModel() != Reloc::PIC_ || 
       MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
    return AsmPrinter::EmitFunctionEntryLabel();

  if (!Subtarget->isPPC64()) {
    const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
  	if (PPCFI->usesPICBase()) {
      MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
      MCSymbol *PICBase = MF->getPICBaseSymbol();
      OutStreamer.EmitLabel(RelocSymbol);

      const MCExpr *OffsExpr =
        MCBinaryExpr::CreateSub(
          MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
                                                               OutContext),
                                  MCSymbolRefExpr::Create(PICBase, OutContext),
          OutContext);
      OutStreamer.EmitValue(OffsExpr, 4);
      OutStreamer.EmitLabel(CurrentFnSym);
      return;
    } else
      return AsmPrinter::EmitFunctionEntryLabel();
  }

  // ELFv2 ABI - Normal entry label.
  if (Subtarget->isELFv2ABI())
    return AsmPrinter::EmitFunctionEntryLabel();

  // Emit an official procedure descriptor.
  MCSectionSubPair Current = OutStreamer.getCurrentSection();
  const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
      ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
  OutStreamer.SwitchSection(Section);
  OutStreamer.EmitLabel(CurrentFnSym);
  OutStreamer.EmitValueToAlignment(8);
  MCSymbol *Symbol1 = 
    OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
  // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
  // entry point.
  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
			8 /*size*/);
  MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
  // Generates a R_PPC64_TOC relocation for TOC base insertion.
  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
                        MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
                        8/*size*/);
  // Emit a null environment pointer.
  OutStreamer.EmitIntValue(0, 8 /* size */);
  OutStreamer.SwitchSection(Current.first, Current.second);

  MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
                          ".L." + Twine(CurrentFnSym->getName()));
  OutStreamer.EmitLabel(RealFnSym);
  CurrentFnSymForSize = RealFnSym;
}


bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
  const DataLayout *TD = TM.getDataLayout();

  bool isPPC64 = TD->getPointerSizeInBits() == 64;

  PPCTargetStreamer &TS =
      static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());

  if (!TOC.empty()) {
    const MCSectionELF *Section;
    
    if (isPPC64)
      Section = OutStreamer.getContext().getELFSection(
          ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
        else
          Section = OutStreamer.getContext().getELFSection(
              ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
    OutStreamer.SwitchSection(Section);

    for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
         E = TOC.end(); I != E; ++I) {
      OutStreamer.EmitLabel(I->second);
      MCSymbol *S = I->first;
      if (isPPC64)
        TS.emitTCEntry(*S);
      else
        OutStreamer.EmitSymbolValue(S, 4);
    }
  }

  MachineModuleInfoELF &MMIELF =
    MMI->getObjFileInfo<MachineModuleInfoELF>();

  MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
  if (!Stubs.empty()) {
    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
      // L_foo$stub:
      OutStreamer.EmitLabel(Stubs[i].first);
      //   .long _foo
      OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
                                                    OutContext),
                            isPPC64 ? 8 : 4/*size*/);
    }

    Stubs.clear();
    OutStreamer.AddBlankLine();
  }

  return AsmPrinter::doFinalization(M);
}

/// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
  // In the ELFv2 ABI, in functions that use the TOC register, we need to
  // provide two entry points.  The ABI guarantees that when calling the
  // local entry point, r2 is set up by the caller to contain the TOC base
  // for this function, and when calling the global entry point, r12 is set
  // up by the caller to hold the address of the global entry point.  We
  // thus emit a prefix sequence along the following lines:
  //
  // func:
  //         # global entry point
  //         addis r2,r12,(.TOC.-func)@ha
  //         addi  r2,r2,(.TOC.-func)@l
  //         .localentry func, .-func
  //         # local entry point, followed by function body
  //
  // This ensures we have r2 set up correctly while executing the function
  // body, no matter which entry point is called.
  if (Subtarget->isELFv2ABI()
      // Only do all that if the function uses r2 in the first place.
      && !MF->getRegInfo().use_empty(PPC::X2)) {

    MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
    OutStreamer.EmitLabel(GlobalEntryLabel);
    const MCSymbolRefExpr *GlobalEntryLabelExp =
      MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);

    MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
    const MCExpr *TOCDeltaExpr =
      MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
                              GlobalEntryLabelExp, OutContext);

    const MCExpr *TOCDeltaHi =
      PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
                                .addReg(PPC::X2)
                                .addReg(PPC::X12)
                                .addExpr(TOCDeltaHi));

    const MCExpr *TOCDeltaLo =
      PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
                                .addReg(PPC::X2)
                                .addReg(PPC::X2)
                                .addExpr(TOCDeltaLo));

    MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
    OutStreamer.EmitLabel(LocalEntryLabel);
    const MCSymbolRefExpr *LocalEntryLabelExp =
       MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
    const MCExpr *LocalOffsetExp =
      MCBinaryExpr::CreateSub(LocalEntryLabelExp,
                              GlobalEntryLabelExp, OutContext);

    PPCTargetStreamer *TS =
      static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());

    if (TS)
      TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
  }
}

/// EmitFunctionBodyEnd - Print the traceback table before the .size
/// directive.
///
void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
  // Only the 64-bit target requires a traceback table.  For now,
  // we only emit the word of zeroes that GDB requires to find
  // the end of the function, and zeroes for the eight-byte
  // mandatory fields.
  // FIXME: We should fill in the eight-byte mandatory fields as described in
  // the PPC64 ELF ABI (this is a low-priority item because GDB does not
  // currently make use of these fields).
  if (Subtarget->isPPC64()) {
    OutStreamer.EmitIntValue(0, 4/*size*/);
    OutStreamer.EmitIntValue(0, 8/*size*/);
  }
}

void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
  static const char *const CPUDirectives[] = {
    "",
    "ppc",
    "ppc440",
    "ppc601",
    "ppc602",
    "ppc603",
    "ppc7400",
    "ppc750",
    "ppc970",
    "ppcA2",
    "ppce500mc",
    "ppce5500",
    "power3",
    "power4",
    "power5",
    "power5x",
    "power6",
    "power6x",
    "power7",
    "ppc64",
    "ppc64le"
  };

  // Get the numerically largest directive.
  // FIXME: How should we merge darwin directives?
  unsigned Directive = PPC::DIR_NONE;
  for (const Function &F : M) {
    const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
    unsigned FDir = STI.getDarwinDirective();
    Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
    if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
      Directive = PPC::DIR_970;
    if (STI.hasAltivec() && Directive < PPC::DIR_7400)
      Directive = PPC::DIR_7400;
    if (STI.isPPC64() && Directive < PPC::DIR_64)
      Directive = PPC::DIR_64;
  }

  assert(Directive <= PPC::DIR_64 && "Directive out of range.");

  assert(Directive < array_lengthof(CPUDirectives) &&
         "CPUDirectives[] might not be up-to-date!");
  PPCTargetStreamer &TStreamer =
      *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
  TStreamer.emitMachine(CPUDirectives[Directive]);

  // Prime text sections so they are adjacent.  This reduces the likelihood a
  // large data or debug section causes a branch to exceed 16M limit.
  const TargetLoweringObjectFileMachO &TLOFMacho = 
    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
  OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
  if (TM.getRelocationModel() == Reloc::PIC_) {
    OutStreamer.SwitchSection(
           OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
                                      MachO::S_SYMBOL_STUBS |
                                      MachO::S_ATTR_PURE_INSTRUCTIONS,
                                      32, SectionKind::getText()));
  } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
    OutStreamer.SwitchSection(
           OutContext.getMachOSection("__TEXT","__symbol_stub1",
                                      MachO::S_SYMBOL_STUBS |
                                      MachO::S_ATTR_PURE_INSTRUCTIONS,
                                      16, SectionKind::getText()));
  }
  OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
}

static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
  // Remove $stub suffix, add $lazy_ptr.
  StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
  return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
}

static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
  // Add $tmp suffix to $stub, yielding $stub$tmp.
  return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
}

void PPCDarwinAsmPrinter::
EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;

  // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
  // This is because the MachineFunction won't exist (but have not yet been
  // freed) and since we're at the global level we can use the default
  // constructed subtarget.
  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
      TM.getTargetTriple(), TM.getTargetCPU(), TM.getTargetFeatureString()));
  auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
    S.EmitInstruction(Inst, *STI);
  };

  const TargetLoweringObjectFileMachO &TLOFMacho = 
    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());

  // .lazy_symbol_pointer
  const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
  
  // Output stubs for dynamically-linked functions
  if (TM.getRelocationModel() == Reloc::PIC_) {
    const MCSection *StubSection = 
    OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
                               MachO::S_SYMBOL_STUBS |
                               MachO::S_ATTR_PURE_INSTRUCTIONS,
                               32, SectionKind::getText());
    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
      OutStreamer.SwitchSection(StubSection);
      EmitAlignment(4);
      
      MCSymbol *Stub = Stubs[i].first;
      MCSymbol *RawSym = Stubs[i].second.getPointer();
      MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
      MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
                                           
      OutStreamer.EmitLabel(Stub);
      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);

      const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
      const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
      const MCExpr *Sub =
        MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);

      // mflr r0
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
      // bcl 20, 31, AnonSymbol
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
      OutStreamer.EmitLabel(AnonSymbol);
      // mflr r11
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
      // addis r11, r11, ha16(LazyPtr - AnonSymbol)
      const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, true, OutContext);
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
        .addReg(PPC::R11)
        .addReg(PPC::R11)
        .addExpr(SubHa16));
      // mtlr r0
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));

      // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
      // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
      const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, true, OutContext);
      EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
        .addReg(PPC::R12)
        .addExpr(SubLo16).addExpr(SubLo16)
        .addReg(PPC::R11));
      // mtctr r12
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
      // bctr
      EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));

      OutStreamer.SwitchSection(LSPSection);
      OutStreamer.EmitLabel(LazyPtr);
      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);

      MCSymbol *DyldStubBindingHelper =
        OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
      if (isPPC64) {
        // .quad dyld_stub_binding_helper
        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
      } else {
        // .long dyld_stub_binding_helper
        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
      }
    }
    OutStreamer.AddBlankLine();
    return;
  }
  
  const MCSection *StubSection =
    OutContext.getMachOSection("__TEXT","__symbol_stub1",
                               MachO::S_SYMBOL_STUBS |
                               MachO::S_ATTR_PURE_INSTRUCTIONS,
                               16, SectionKind::getText());
  for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
    MCSymbol *Stub = Stubs[i].first;
    MCSymbol *RawSym = Stubs[i].second.getPointer();
    MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
    const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);

    OutStreamer.SwitchSection(StubSection);
    EmitAlignment(4);
    OutStreamer.EmitLabel(Stub);
    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);

    // lis r11, ha16(LazyPtr)
    const MCExpr *LazyPtrHa16 =
      PPCMCExpr::CreateHa(LazyPtrExpr, true, OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
      .addReg(PPC::R11)
      .addExpr(LazyPtrHa16));

    // ldu r12, lo16(LazyPtr)(r11)
    // lwzu r12, lo16(LazyPtr)(r11)
    const MCExpr *LazyPtrLo16 =
      PPCMCExpr::CreateLo(LazyPtrExpr, true, OutContext);
    EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
      .addReg(PPC::R12)
      .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
      .addReg(PPC::R11));

    // mtctr r12
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
    // bctr
    EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));

    OutStreamer.SwitchSection(LSPSection);
    OutStreamer.EmitLabel(LazyPtr);
    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);

    MCSymbol *DyldStubBindingHelper =
      OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
    if (isPPC64) {
      // .quad dyld_stub_binding_helper
      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
    } else {
      // .long dyld_stub_binding_helper
      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
    }
  }
  
  OutStreamer.AddBlankLine();
}


bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;

  // Darwin/PPC always uses mach-o.
  const TargetLoweringObjectFileMachO &TLOFMacho = 
    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
  MachineModuleInfoMachO &MMIMacho =
    MMI->getObjFileInfo<MachineModuleInfoMachO>();
  
  MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
  if (!Stubs.empty())
    EmitFunctionStubs(Stubs);

  if (MAI->doesSupportExceptionHandling() && MMI) {
    // Add the (possibly multiple) personalities to the set of global values.
    // Only referenced functions get into the Personalities list.
    const std::vector<const Function*> &Personalities = MMI->getPersonalities();
    for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
         E = Personalities.end(); I != E; ++I) {
      if (*I) {
        MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
        MachineModuleInfoImpl::StubValueTy &StubSym =
          MMIMacho.getGVStubEntry(NLPSym);
        StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
      }
    }
  }

  // Output stubs for dynamically-linked functions.
  Stubs = MMIMacho.GetGVStubList();
  
  // Output macho stubs for external and common global variables.
  if (!Stubs.empty()) {
    // Switch with ".non_lazy_symbol_pointer" directive.
    OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
    EmitAlignment(isPPC64 ? 3 : 2);
    
    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
      // L_foo$stub:
      OutStreamer.EmitLabel(Stubs[i].first);
      //   .indirect_symbol _foo
      MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
      OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);

      if (MCSym.getInt())
        // External to current translation unit.
        OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
      else
        // Internal to current translation unit.
        //
        // When we place the LSDA into the TEXT section, the type info pointers
        // need to be indirect and pc-rel. We accomplish this by using NLPs.
        // However, sometimes the types are local to the file. So we need to
        // fill in the value for the NLP in those cases.
        OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
                                                      OutContext),
                              isPPC64 ? 8 : 4/*size*/);
    }

    Stubs.clear();
    OutStreamer.AddBlankLine();
  }

  Stubs = MMIMacho.GetHiddenGVStubList();
  if (!Stubs.empty()) {
    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
    EmitAlignment(isPPC64 ? 3 : 2);
    
    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
      // L_foo$stub:
      OutStreamer.EmitLabel(Stubs[i].first);
      //   .long _foo
      OutStreamer.EmitValue(MCSymbolRefExpr::
                            Create(Stubs[i].second.getPointer(),
                                   OutContext),
                            isPPC64 ? 8 : 4/*size*/);
    }

    Stubs.clear();
    OutStreamer.AddBlankLine();
  }

  // Funny Darwin hack: This flag tells the linker that no global symbols
  // contain code that falls through to other global symbols (e.g. the obvious
  // implementation of multiple entry points).  If this doesn't occur, the
  // linker can safely perform dead code stripping.  Since LLVM never generates
  // code that does this, it is always safe to set.
  OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);

  return AsmPrinter::doFinalization(M);
}

/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
/// for a MachineFunction to the given output stream, in a format that the
/// Darwin assembler can deal with.
///
static AsmPrinter *
createPPCAsmPrinterPass(TargetMachine &tm,
                        std::unique_ptr<MCStreamer> &&Streamer) {
  if (Triple(tm.getTargetTriple()).isMacOSX())
    return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
  return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
}

// Force static initialization.
extern "C" void LLVMInitializePowerPCAsmPrinter() { 
  TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
  TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
  TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);
}