PPCAsmPrinter.cpp revision 58fc1f52ce070003acbdfedc85d52ba999a2bd11 
1//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a printer that converts from our internal representation
11// of machine-dependent LLVM code to PowerPC assembly language. This printer is
12// the output mechanism used by `llc'.
13//
14// Documentation at http://developer.apple.com/documentation/DeveloperTools/
15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
16//
17//===----------------------------------------------------------------------===//
18
19#define DEBUG_TYPE "asmprinter"
20#include "PPC.h"
21#include "InstPrinter/PPCInstPrinter.h"
22#include "MCTargetDesc/PPCPredicates.h"
23#include "MCTargetDesc/PPCMCExpr.h"
24#include "PPCSubtarget.h"
25#include "PPCTargetMachine.h"
26#include "llvm/ADT/MapVector.h"
27#include "llvm/ADT/SmallString.h"
28#include "llvm/ADT/StringExtras.h"
29#include "llvm/Assembly/Writer.h"
30#include "llvm/CodeGen/AsmPrinter.h"
31#include "llvm/CodeGen/MachineFunctionPass.h"
32#include "llvm/CodeGen/MachineInstr.h"
33#include "llvm/CodeGen/MachineInstrBuilder.h"
34#include "llvm/CodeGen/MachineModuleInfoImpls.h"
35#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
36#include "llvm/DebugInfo.h"
37#include "llvm/IR/Constants.h"
38#include "llvm/IR/DerivedTypes.h"
39#include "llvm/IR/Module.h"
40#include "llvm/MC/MCAsmInfo.h"
41#include "llvm/MC/MCContext.h"
42#include "llvm/MC/MCExpr.h"
43#include "llvm/MC/MCInst.h"
44#include "llvm/MC/MCInstBuilder.h"
45#include "llvm/MC/MCSectionELF.h"
46#include "llvm/MC/MCSectionMachO.h"
47#include "llvm/MC/MCStreamer.h"
48#include "llvm/MC/MCSymbol.h"
49#include "llvm/Support/CommandLine.h"
50#include "llvm/Support/Debug.h"
51#include "llvm/Support/ELF.h"
52#include "llvm/Support/ErrorHandling.h"
53#include "llvm/Support/MathExtras.h"
54#include "llvm/Support/TargetRegistry.h"
55#include "llvm/Support/raw_ostream.h"
56#include "llvm/Target/Mangler.h"
57#include "llvm/Target/TargetInstrInfo.h"
58#include "llvm/Target/TargetOptions.h"
59#include "llvm/Target/TargetRegisterInfo.h"
60using namespace llvm;
61
62namespace {
63  class PPCAsmPrinter : public AsmPrinter {
64  protected:
65    MapVector<MCSymbol*, MCSymbol*> TOC;
66    const PPCSubtarget &Subtarget;
67    uint64_t TOCLabelID;
68  public:
69    explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
70      : AsmPrinter(TM, Streamer),
71        Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
72
73    virtual const char *getPassName() const {
74      return "PowerPC Assembly Printer";
75    }
76
77    MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
78
79    virtual void EmitInstruction(const MachineInstr *MI);
80
81    void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
82
83    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
84                         unsigned AsmVariant, const char *ExtraCode,
85                         raw_ostream &O);
86    bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
87                               unsigned AsmVariant, const char *ExtraCode,
88                               raw_ostream &O);
89  };
90
91  /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
92  class PPCLinuxAsmPrinter : public PPCAsmPrinter {
93  public:
94    explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
95      : PPCAsmPrinter(TM, Streamer) {}
96
97    virtual const char *getPassName() const {
98      return "Linux PPC Assembly Printer";
99    }
100
101    bool doFinalization(Module &M);
102
103    virtual void EmitFunctionEntryLabel();
104
105    void EmitFunctionBodyEnd();
106  };
107
108  /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
109  /// OS X
110  class PPCDarwinAsmPrinter : public PPCAsmPrinter {
111  public:
112    explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
113      : PPCAsmPrinter(TM, Streamer) {}
114
115    virtual const char *getPassName() const {
116      return "Darwin PPC Assembly Printer";
117    }
118
119    bool doFinalization(Module &M);
120    void EmitStartOfAsmFile(Module &M);
121
122    void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
123  };
124} // end of anonymous namespace
125
126/// stripRegisterPrefix - This method strips the character prefix from a
127/// register name so that only the number is left.  Used by for linux asm.
128static const char *stripRegisterPrefix(const char *RegName) {
129  switch (RegName[0]) {
130    case 'r':
131    case 'f':
132    case 'v': return RegName + 1;
133    case 'c': if (RegName[1] == 'r') return RegName + 2;
134  }
135
136  return RegName;
137}
138
139void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
140                                 raw_ostream &O) {
141  const MachineOperand &MO = MI->getOperand(OpNo);
142
143  switch (MO.getType()) {
144  case MachineOperand::MO_Register: {
145    const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
146    // Linux assembler (Others?) does not take register mnemonics.
147    // FIXME - What about special registers used in mfspr/mtspr?
148    if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
149    O << RegName;
150    return;
151  }
152  case MachineOperand::MO_Immediate:
153    O << MO.getImm();
154    return;
155
156  case MachineOperand::MO_MachineBasicBlock:
157    O << *MO.getMBB()->getSymbol();
158    return;
159  case MachineOperand::MO_JumpTableIndex:
160    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
161      << '_' << MO.getIndex();
162    // FIXME: PIC relocation model
163    return;
164  case MachineOperand::MO_ConstantPoolIndex:
165    O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166      << '_' << MO.getIndex();
167    return;
168  case MachineOperand::MO_BlockAddress:
169    O << *GetBlockAddressSymbol(MO.getBlockAddress());
170    return;
171  case MachineOperand::MO_ExternalSymbol: {
172    // Computing the address of an external symbol, not calling it.
173    if (TM.getRelocationModel() == Reloc::Static) {
174      O << *GetExternalSymbolSymbol(MO.getSymbolName());
175      return;
176    }
177
178    MCSymbol *NLPSym =
179      OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
180                                   MO.getSymbolName()+"$non_lazy_ptr");
181    MachineModuleInfoImpl::StubValueTy &StubSym =
182      MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
183    if (StubSym.getPointer() == 0)
184      StubSym = MachineModuleInfoImpl::
185        StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
186
187    O << *NLPSym;
188    return;
189  }
190  case MachineOperand::MO_GlobalAddress: {
191    // Computing the address of a global symbol, not calling it.
192    const GlobalValue *GV = MO.getGlobal();
193    MCSymbol *SymToPrint;
194
195    // External or weakly linked global variables need non-lazily-resolved stubs
196    if (TM.getRelocationModel() != Reloc::Static &&
197        (GV->isDeclaration() || GV->isWeakForLinker())) {
198      if (!GV->hasHiddenVisibility()) {
199        SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
200        MachineModuleInfoImpl::StubValueTy &StubSym =
201          MMI->getObjFileInfo<MachineModuleInfoMachO>()
202            .getGVStubEntry(SymToPrint);
203        if (StubSym.getPointer() == 0)
204          StubSym = MachineModuleInfoImpl::
205            StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
206      } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
207                 GV->hasAvailableExternallyLinkage()) {
208        SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
209
210        MachineModuleInfoImpl::StubValueTy &StubSym =
211          MMI->getObjFileInfo<MachineModuleInfoMachO>().
212                    getHiddenGVStubEntry(SymToPrint);
213        if (StubSym.getPointer() == 0)
214          StubSym = MachineModuleInfoImpl::
215            StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
216      } else {
217        SymToPrint = Mang->getSymbol(GV);
218      }
219    } else {
220      SymToPrint = Mang->getSymbol(GV);
221    }
222
223    O << *SymToPrint;
224
225    printOffset(MO.getOffset(), O);
226    return;
227  }
228
229  default:
230    O << "<unknown operand type: " << MO.getType() << ">";
231    return;
232  }
233}
234
235/// PrintAsmOperand - Print out an operand for an inline asm expression.
236///
237bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
238                                    unsigned AsmVariant,
239                                    const char *ExtraCode, raw_ostream &O) {
240  // Does this asm operand have a single letter operand modifier?
241  if (ExtraCode && ExtraCode[0]) {
242    if (ExtraCode[1] != 0) return true; // Unknown modifier.
243
244    switch (ExtraCode[0]) {
245    default:
246      // See if this is a generic print operand
247      return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248    case 'c': // Don't print "$" before a global var name or constant.
249      break; // PPC never has a prefix.
250    case 'L': // Write second word of DImode reference.
251      // Verify that this operand has two consecutive registers.
252      if (!MI->getOperand(OpNo).isReg() ||
253          OpNo+1 == MI->getNumOperands() ||
254          !MI->getOperand(OpNo+1).isReg())
255        return true;
256      ++OpNo;   // Return the high-part.
257      break;
258    case 'I':
259      // Write 'i' if an integer constant, otherwise nothing.  Used to print
260      // addi vs add, etc.
261      if (MI->getOperand(OpNo).isImm())
262        O << "i";
263      return false;
264    }
265  }
266
267  printOperand(MI, OpNo, O);
268  return false;
269}
270
271// At the moment, all inline asm memory operands are a single register.
272// In any case, the output of this routine should always be just one
273// assembler operand.
274
275bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
276                                          unsigned AsmVariant,
277                                          const char *ExtraCode,
278                                          raw_ostream &O) {
279  if (ExtraCode && ExtraCode[0]) {
280    if (ExtraCode[1] != 0) return true; // Unknown modifier.
281
282    switch (ExtraCode[0]) {
283    default: return true;  // Unknown modifier.
284    case 'y': // A memory reference for an X-form instruction
285      {
286        const char *RegName = "r0";
287        if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
288        O << RegName << ", ";
289        printOperand(MI, OpNo, O);
290        return false;
291      }
292    }
293  }
294
295  assert(MI->getOperand(OpNo).isReg());
296  O << "0(";
297  printOperand(MI, OpNo, O);
298  O << ")";
299  return false;
300}
301
302
303/// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
304/// exists for it.  If not, create one.  Then return a symbol that references
305/// the TOC entry.
306MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
307
308  MCSymbol *&TOCEntry = TOC[Sym];
309
310  // To avoid name clash check if the name already exists.
311  while (TOCEntry == 0) {
312    if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
313                                "C" + Twine(TOCLabelID++)) == 0) {
314      TOCEntry = GetTempSymbol("C", TOCLabelID);
315    }
316  }
317
318  return TOCEntry;
319}
320
321
322/// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
323/// the current output stream.
324///
325void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
326  MCInst TmpInst;
327
328  // Lower multi-instruction pseudo operations.
329  switch (MI->getOpcode()) {
330  default: break;
331  case TargetOpcode::DBG_VALUE:
332    llvm_unreachable("Should be handled target independently");
333  case PPC::MovePCtoLR:
334  case PPC::MovePCtoLR8: {
335    // Transform %LR = MovePCtoLR
336    // Into this, where the label is the PIC base:
337    //     bl L1$pb
338    // L1$pb:
339    MCSymbol *PICBase = MF->getPICBaseSymbol();
340
341    // Emit the 'bl'.
342    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL)
343      // FIXME: We would like an efficient form for this, so we don't have to do
344      // a lot of extra uniquing.
345      .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
346
347    // Emit the label.
348    OutStreamer.EmitLabel(PICBase);
349    return;
350  }
351  case PPC::LDtocJTI:
352  case PPC::LDtocCPT:
353  case PPC::LDtoc: {
354    // Transform %X3 = LDtoc <ga:@min1>, %X2
355    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
356
357    // Change the opcode to LD, and the global address operand to be a
358    // reference to the TOC entry we will synthesize later.
359    TmpInst.setOpcode(PPC::LD);
360    const MachineOperand &MO = MI->getOperand(1);
361
362    // Map symbol -> label of TOC entry
363    assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
364    MCSymbol *MOSymbol = 0;
365    if (MO.isGlobal())
366      MOSymbol = Mang->getSymbol(MO.getGlobal());
367    else if (MO.isCPI())
368      MOSymbol = GetCPISymbol(MO.getIndex());
369    else if (MO.isJTI())
370      MOSymbol = GetJTISymbol(MO.getIndex());
371
372    MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
373
374    const MCExpr *Exp =
375      MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
376                              OutContext);
377    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
378    OutStreamer.EmitInstruction(TmpInst);
379    return;
380  }
381
382  case PPC::ADDIStocHA: {
383    // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
384    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
385
386    // Change the opcode to ADDIS8.  If the global address is external,
387    // has common linkage, is a function address, or is a jump table
388    // address, then generate a TOC entry and reference that.  Otherwise
389    // reference the symbol directly.
390    TmpInst.setOpcode(PPC::ADDIS8);
391    const MachineOperand &MO = MI->getOperand(2);
392    assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
393           "Invalid operand for ADDIStocHA!");
394    MCSymbol *MOSymbol = 0;
395    bool IsExternal = false;
396    bool IsFunction = false;
397    bool IsCommon = false;
398    bool IsAvailExt = false;
399
400    if (MO.isGlobal()) {
401      const GlobalValue *GValue = MO.getGlobal();
402      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
403      const GlobalValue *RealGValue = GAlias ?
404        GAlias->resolveAliasedGlobal(false) : GValue;
405      MOSymbol = Mang->getSymbol(RealGValue);
406      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
407      IsExternal = GVar && !GVar->hasInitializer();
408      IsCommon = GVar && RealGValue->hasCommonLinkage();
409      IsFunction = !GVar;
410      IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage();
411    } else if (MO.isCPI())
412      MOSymbol = GetCPISymbol(MO.getIndex());
413    else if (MO.isJTI())
414      MOSymbol = GetJTISymbol(MO.getIndex());
415
416    if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI())
417      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
418
419    const MCExpr *Exp =
420      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
421                              OutContext);
422    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
423    OutStreamer.EmitInstruction(TmpInst);
424    return;
425  }
426  case PPC::LDtocL: {
427    // Transform %Xd = LDtocL <ga:@sym>, %Xs
428    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
429
430    // Change the opcode to LD.  If the global address is external, has
431    // common linkage, or is a jump table address, then reference the
432    // associated TOC entry.  Otherwise reference the symbol directly.
433    TmpInst.setOpcode(PPC::LD);
434    const MachineOperand &MO = MI->getOperand(1);
435    assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
436           "Invalid operand for LDtocL!");
437    MCSymbol *MOSymbol = 0;
438
439    if (MO.isJTI())
440      MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
441    else if (MO.isCPI())
442      MOSymbol = GetCPISymbol(MO.getIndex());
443    else if (MO.isGlobal()) {
444      const GlobalValue *GValue = MO.getGlobal();
445      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
446      const GlobalValue *RealGValue = GAlias ?
447        GAlias->resolveAliasedGlobal(false) : GValue;
448      MOSymbol = Mang->getSymbol(RealGValue);
449      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
450
451      if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
452          RealGValue->hasAvailableExternallyLinkage())
453        MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
454    }
455
456    const MCExpr *Exp =
457      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
458                              OutContext);
459    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
460    OutStreamer.EmitInstruction(TmpInst);
461    return;
462  }
463  case PPC::ADDItocL: {
464    // Transform %Xd = ADDItocL %Xs, <ga:@sym>
465    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
466
467    // Change the opcode to ADDI8.  If the global address is external, then
468    // generate a TOC entry and reference that.  Otherwise reference the
469    // symbol directly.
470    TmpInst.setOpcode(PPC::ADDI8);
471    const MachineOperand &MO = MI->getOperand(2);
472    assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
473    MCSymbol *MOSymbol = 0;
474    bool IsExternal = false;
475    bool IsFunction = false;
476
477    if (MO.isGlobal()) {
478      const GlobalValue *GValue = MO.getGlobal();
479      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
480      const GlobalValue *RealGValue = GAlias ?
481        GAlias->resolveAliasedGlobal(false) : GValue;
482      MOSymbol = Mang->getSymbol(RealGValue);
483      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
484      IsExternal = GVar && !GVar->hasInitializer();
485      IsFunction = !GVar;
486    } else if (MO.isCPI())
487      MOSymbol = GetCPISymbol(MO.getIndex());
488
489    if (IsFunction || IsExternal)
490      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
491
492    const MCExpr *Exp =
493      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
494                              OutContext);
495    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
496    OutStreamer.EmitInstruction(TmpInst);
497    return;
498  }
499  case PPC::ADDISgotTprelHA: {
500    // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
501    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
502    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
503    const MachineOperand &MO = MI->getOperand(2);
504    const GlobalValue *GValue = MO.getGlobal();
505    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
506    const MCExpr *SymGotTprel =
507      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
508                              OutContext);
509    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
510                                .addReg(MI->getOperand(0).getReg())
511                                .addReg(PPC::X2)
512                                .addExpr(SymGotTprel));
513    return;
514  }
515  case PPC::LDgotTprelL: {
516    // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
517    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
518
519    // Change the opcode to LD.
520    TmpInst.setOpcode(PPC::LD);
521    const MachineOperand &MO = MI->getOperand(1);
522    const GlobalValue *GValue = MO.getGlobal();
523    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
524    const MCExpr *Exp =
525      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
526                              OutContext);
527    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
528    OutStreamer.EmitInstruction(TmpInst);
529    return;
530  }
531  case PPC::ADDIStlsgdHA: {
532    // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
533    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
534    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
535    const MachineOperand &MO = MI->getOperand(2);
536    const GlobalValue *GValue = MO.getGlobal();
537    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
538    const MCExpr *SymGotTlsGD =
539      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
540                              OutContext);
541    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
542                                .addReg(MI->getOperand(0).getReg())
543                                .addReg(PPC::X2)
544                                .addExpr(SymGotTlsGD));
545    return;
546  }
547  case PPC::ADDItlsgdL: {
548    // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
549    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsgd@l
550    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
551    const MachineOperand &MO = MI->getOperand(2);
552    const GlobalValue *GValue = MO.getGlobal();
553    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
554    const MCExpr *SymGotTlsGD =
555      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
556                              OutContext);
557    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
558                                .addReg(MI->getOperand(0).getReg())
559                                .addReg(MI->getOperand(1).getReg())
560                                .addExpr(SymGotTlsGD));
561    return;
562  }
563  case PPC::GETtlsADDR: {
564    // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
565    // Into:      BL8_NOP_TLSGD __tls_get_addr(sym@tlsgd)
566    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
567
568    StringRef Name = "__tls_get_addr";
569    MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
570    const MCSymbolRefExpr *TlsRef =
571      MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
572    const MachineOperand &MO = MI->getOperand(2);
573    const GlobalValue *GValue = MO.getGlobal();
574    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
575    const MCExpr *SymVar =
576      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_TLSGD, OutContext);
577    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSGD)
578                                .addExpr(TlsRef)
579                                .addExpr(SymVar));
580    return;
581  }
582  case PPC::ADDIStlsldHA: {
583    // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
584    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
585    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
586    const MachineOperand &MO = MI->getOperand(2);
587    const GlobalValue *GValue = MO.getGlobal();
588    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
589    const MCExpr *SymGotTlsLD =
590      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
591                              OutContext);
592    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
593                                .addReg(MI->getOperand(0).getReg())
594                                .addReg(PPC::X2)
595                                .addExpr(SymGotTlsLD));
596    return;
597  }
598  case PPC::ADDItlsldL: {
599    // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
600    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsld@l
601    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
602    const MachineOperand &MO = MI->getOperand(2);
603    const GlobalValue *GValue = MO.getGlobal();
604    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
605    const MCExpr *SymGotTlsLD =
606      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
607                              OutContext);
608    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
609                                .addReg(MI->getOperand(0).getReg())
610                                .addReg(MI->getOperand(1).getReg())
611                                .addExpr(SymGotTlsLD));
612    return;
613  }
614  case PPC::GETtlsldADDR: {
615    // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
616    // Into:      BL8_NOP_TLSLD __tls_get_addr(sym@tlsld)
617    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
618
619    StringRef Name = "__tls_get_addr";
620    MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
621    const MCSymbolRefExpr *TlsRef =
622      MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
623    const MachineOperand &MO = MI->getOperand(2);
624    const GlobalValue *GValue = MO.getGlobal();
625    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
626    const MCExpr *SymVar =
627      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_TLSLD, OutContext);
628    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSLD)
629                                .addExpr(TlsRef)
630                                .addExpr(SymVar));
631    return;
632  }
633  case PPC::ADDISdtprelHA: {
634    // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
635    // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
636    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
637    const MachineOperand &MO = MI->getOperand(2);
638    const GlobalValue *GValue = MO.getGlobal();
639    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
640    const MCExpr *SymDtprel =
641      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
642                              OutContext);
643    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
644                                .addReg(MI->getOperand(0).getReg())
645                                .addReg(PPC::X3)
646                                .addExpr(SymDtprel));
647    return;
648  }
649  case PPC::ADDIdtprelL: {
650    // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
651    // Into:      %Xd = ADDI8 %Xs, sym@dtprel@l
652    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
653    const MachineOperand &MO = MI->getOperand(2);
654    const GlobalValue *GValue = MO.getGlobal();
655    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
656    const MCExpr *SymDtprel =
657      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
658                              OutContext);
659    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
660                                .addReg(MI->getOperand(0).getReg())
661                                .addReg(MI->getOperand(1).getReg())
662                                .addExpr(SymDtprel));
663    return;
664  }
665  case PPC::MFCRpseud:
666  case PPC::MFCR8pseud:
667    // Transform: %R3 = MFCRpseud %CR7
668    // Into:      %R3 = MFCR      ;; cr7
669    OutStreamer.AddComment(PPCInstPrinter::
670                           getRegisterName(MI->getOperand(1).getReg()));
671    OutStreamer.EmitInstruction(MCInstBuilder(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR)
672      .addReg(MI->getOperand(0).getReg()));
673    return;
674  case PPC::SYNC:
675    // In Book E sync is called msync, handle this special case here...
676    if (Subtarget.isBookE()) {
677      OutStreamer.EmitRawText(StringRef("\tmsync"));
678      return;
679    }
680    break;
681  case PPC::LD:
682  case PPC::STD:
683  case PPC::LWA: {
684    // Verify alignment is legal, so we don't create relocations
685    // that can't be supported.
686    // FIXME:  This test is currently disabled for Darwin.  The test
687    // suite shows a handful of test cases that fail this check for
688    // Darwin.  Those need to be investigated before this sanity test
689    // can be enabled for those subtargets.
690    if (!Subtarget.isDarwin()) {
691      unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
692      const MachineOperand &MO = MI->getOperand(OpNum);
693      if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
694        llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
695    }
696    // Now process the instruction normally.
697    break;
698  }
699  }
700
701  LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
702  OutStreamer.EmitInstruction(TmpInst);
703}
704
705void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
706  if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
707    return AsmPrinter::EmitFunctionEntryLabel();
708
709  // Emit an official procedure descriptor.
710  MCSectionSubPair Current = OutStreamer.getCurrentSection();
711  const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
712      ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
713      SectionKind::getReadOnly());
714  OutStreamer.SwitchSection(Section);
715  OutStreamer.EmitLabel(CurrentFnSym);
716  OutStreamer.EmitValueToAlignment(8);
717  MCSymbol *Symbol1 =
718    OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
719  // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
720  // entry point.
721  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
722			8 /*size*/);
723  MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
724  // Generates a R_PPC64_TOC relocation for TOC base insertion.
725  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
726                        MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
727                        8/*size*/);
728  // Emit a null environment pointer.
729  OutStreamer.EmitIntValue(0, 8 /* size */);
730  OutStreamer.SwitchSection(Current.first, Current.second);
731
732  MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
733                          ".L." + Twine(CurrentFnSym->getName()));
734  OutStreamer.EmitLabel(RealFnSym);
735  CurrentFnSymForSize = RealFnSym;
736}
737
738
739bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
740  const DataLayout *TD = TM.getDataLayout();
741
742  bool isPPC64 = TD->getPointerSizeInBits() == 64;
743
744  if (isPPC64 && !TOC.empty()) {
745    const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
746        ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
747        SectionKind::getReadOnly());
748    OutStreamer.SwitchSection(Section);
749
750    for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
751         E = TOC.end(); I != E; ++I) {
752      OutStreamer.EmitLabel(I->second);
753      MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
754      OutStreamer.EmitTCEntry(*S);
755    }
756  }
757
758  MachineModuleInfoELF &MMIELF =
759    MMI->getObjFileInfo<MachineModuleInfoELF>();
760
761  MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
762  if (!Stubs.empty()) {
763    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
764    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
765      // L_foo$stub:
766      OutStreamer.EmitLabel(Stubs[i].first);
767      //   .long _foo
768      OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
769                                                    OutContext),
770                            isPPC64 ? 8 : 4/*size*/);
771    }
772
773    Stubs.clear();
774    OutStreamer.AddBlankLine();
775  }
776
777  return AsmPrinter::doFinalization(M);
778}
779
780/// EmitFunctionBodyEnd - Print the traceback table before the .size
781/// directive.
782///
783void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
784  // Only the 64-bit target requires a traceback table.  For now,
785  // we only emit the word of zeroes that GDB requires to find
786  // the end of the function, and zeroes for the eight-byte
787  // mandatory fields.
788  // FIXME: We should fill in the eight-byte mandatory fields as described in
789  // the PPC64 ELF ABI (this is a low-priority item because GDB does not
790  // currently make use of these fields).
791  if (Subtarget.isPPC64()) {
792    OutStreamer.EmitIntValue(0, 4/*size*/);
793    OutStreamer.EmitIntValue(0, 8/*size*/);
794  }
795}
796
797void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
798  static const char *const CPUDirectives[] = {
799    "",
800    "ppc",
801    "ppc440",
802    "ppc601",
803    "ppc602",
804    "ppc603",
805    "ppc7400",
806    "ppc750",
807    "ppc970",
808    "ppcA2",
809    "ppce500mc",
810    "ppce5500",
811    "power3",
812    "power4",
813    "power5",
814    "power5x",
815    "power6",
816    "power6x",
817    "power7",
818    "ppc64"
819  };
820
821  unsigned Directive = Subtarget.getDarwinDirective();
822  if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
823    Directive = PPC::DIR_970;
824  if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
825    Directive = PPC::DIR_7400;
826  if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
827    Directive = PPC::DIR_64;
828  assert(Directive <= PPC::DIR_64 && "Directive out of range.");
829
830  // FIXME: This is a total hack, finish mc'izing the PPC backend.
831  if (OutStreamer.hasRawTextSupport()) {
832    assert(Directive < sizeof(CPUDirectives) / sizeof(*CPUDirectives) &&
833           "CPUDirectives[] might not be up-to-date!");
834    OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
835  }
836
837  // Prime text sections so they are adjacent.  This reduces the likelihood a
838  // large data or debug section causes a branch to exceed 16M limit.
839  const TargetLoweringObjectFileMachO &TLOFMacho =
840    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
841  OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
842  if (TM.getRelocationModel() == Reloc::PIC_) {
843    OutStreamer.SwitchSection(
844           OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
845                                      MCSectionMachO::S_SYMBOL_STUBS |
846                                      MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
847                                      32, SectionKind::getText()));
848  } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
849    OutStreamer.SwitchSection(
850           OutContext.getMachOSection("__TEXT","__symbol_stub1",
851                                      MCSectionMachO::S_SYMBOL_STUBS |
852                                      MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
853                                      16, SectionKind::getText()));
854  }
855  OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
856}
857
858static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
859  // Remove $stub suffix, add $lazy_ptr.
860  StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
861  return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
862}
863
864static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
865  // Add $tmp suffix to $stub, yielding $stub$tmp.
866  return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
867}
868
869void PPCDarwinAsmPrinter::
870EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
871  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
872
873  const TargetLoweringObjectFileMachO &TLOFMacho =
874    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
875
876  // .lazy_symbol_pointer
877  const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
878
879  // Output stubs for dynamically-linked functions
880  if (TM.getRelocationModel() == Reloc::PIC_) {
881    const MCSection *StubSection =
882    OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
883                               MCSectionMachO::S_SYMBOL_STUBS |
884                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
885                               32, SectionKind::getText());
886    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
887      OutStreamer.SwitchSection(StubSection);
888      EmitAlignment(4);
889
890      MCSymbol *Stub = Stubs[i].first;
891      MCSymbol *RawSym = Stubs[i].second.getPointer();
892      MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
893      MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
894
895      OutStreamer.EmitLabel(Stub);
896      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
897
898      const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
899      const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
900      const MCExpr *Sub =
901        MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
902
903      // mflr r0
904      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
905      // bcl 20, 31, AnonSymbol
906      OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCLalways).addExpr(Anon));
907      OutStreamer.EmitLabel(AnonSymbol);
908      // mflr r11
909      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
910      // addis r11, r11, ha16(LazyPtr - AnonSymbol)
911      const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, OutContext);
912      OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
913        .addReg(PPC::R11)
914        .addReg(PPC::R11)
915        .addExpr(SubHa16));
916      // mtlr r0
917      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
918
919      // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
920      // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
921      const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, OutContext);
922      OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
923        .addReg(PPC::R12)
924        .addExpr(SubLo16).addExpr(SubLo16)
925        .addReg(PPC::R11));
926      // mtctr r12
927      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
928      // bctr
929      OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
930
931      OutStreamer.SwitchSection(LSPSection);
932      OutStreamer.EmitLabel(LazyPtr);
933      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
934
935      MCSymbol *DyldStubBindingHelper =
936        OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
937      if (isPPC64) {
938        // .quad dyld_stub_binding_helper
939        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
940      } else {
941        // .long dyld_stub_binding_helper
942        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
943      }
944    }
945    OutStreamer.AddBlankLine();
946    return;
947  }
948
949  const MCSection *StubSection =
950    OutContext.getMachOSection("__TEXT","__symbol_stub1",
951                               MCSectionMachO::S_SYMBOL_STUBS |
952                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
953                               16, SectionKind::getText());
954  for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
955    MCSymbol *Stub = Stubs[i].first;
956    MCSymbol *RawSym = Stubs[i].second.getPointer();
957    MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
958    const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
959
960    OutStreamer.SwitchSection(StubSection);
961    EmitAlignment(4);
962    OutStreamer.EmitLabel(Stub);
963    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
964
965    // lis r11, ha16(LazyPtr)
966    const MCExpr *LazyPtrHa16 = PPCMCExpr::CreateHa(LazyPtrExpr, OutContext);
967    OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
968      .addReg(PPC::R11)
969      .addExpr(LazyPtrHa16));
970
971    // ldu r12, lo16(LazyPtr)(r11)
972    // lwzu r12, lo16(LazyPtr)(r11)
973    const MCExpr *LazyPtrLo16 = PPCMCExpr::CreateLo(LazyPtrExpr, OutContext);
974    OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
975      .addReg(PPC::R12)
976      .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
977      .addReg(PPC::R11));
978
979    // mtctr r12
980    OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
981    // bctr
982    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
983
984    OutStreamer.SwitchSection(LSPSection);
985    OutStreamer.EmitLabel(LazyPtr);
986    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
987
988    MCSymbol *DyldStubBindingHelper =
989      OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
990    if (isPPC64) {
991      // .quad dyld_stub_binding_helper
992      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
993    } else {
994      // .long dyld_stub_binding_helper
995      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
996    }
997  }
998
999  OutStreamer.AddBlankLine();
1000}
1001
1002
1003bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1004  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1005
1006  // Darwin/PPC always uses mach-o.
1007  const TargetLoweringObjectFileMachO &TLOFMacho =
1008    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1009  MachineModuleInfoMachO &MMIMacho =
1010    MMI->getObjFileInfo<MachineModuleInfoMachO>();
1011
1012  MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1013  if (!Stubs.empty())
1014    EmitFunctionStubs(Stubs);
1015
1016  if (MAI->doesSupportExceptionHandling() && MMI) {
1017    // Add the (possibly multiple) personalities to the set of global values.
1018    // Only referenced functions get into the Personalities list.
1019    const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1020    for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1021         E = Personalities.end(); I != E; ++I) {
1022      if (*I) {
1023        MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1024        MachineModuleInfoImpl::StubValueTy &StubSym =
1025          MMIMacho.getGVStubEntry(NLPSym);
1026        StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1027      }
1028    }
1029  }
1030
1031  // Output stubs for dynamically-linked functions.
1032  Stubs = MMIMacho.GetGVStubList();
1033
1034  // Output macho stubs for external and common global variables.
1035  if (!Stubs.empty()) {
1036    // Switch with ".non_lazy_symbol_pointer" directive.
1037    OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1038    EmitAlignment(isPPC64 ? 3 : 2);
1039
1040    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1041      // L_foo$stub:
1042      OutStreamer.EmitLabel(Stubs[i].first);
1043      //   .indirect_symbol _foo
1044      MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1045      OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1046
1047      if (MCSym.getInt())
1048        // External to current translation unit.
1049        OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1050      else
1051        // Internal to current translation unit.
1052        //
1053        // When we place the LSDA into the TEXT section, the type info pointers
1054        // need to be indirect and pc-rel. We accomplish this by using NLPs.
1055        // However, sometimes the types are local to the file. So we need to
1056        // fill in the value for the NLP in those cases.
1057        OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1058                                                      OutContext),
1059                              isPPC64 ? 8 : 4/*size*/);
1060    }
1061
1062    Stubs.clear();
1063    OutStreamer.AddBlankLine();
1064  }
1065
1066  Stubs = MMIMacho.GetHiddenGVStubList();
1067  if (!Stubs.empty()) {
1068    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1069    EmitAlignment(isPPC64 ? 3 : 2);
1070
1071    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1072      // L_foo$stub:
1073      OutStreamer.EmitLabel(Stubs[i].first);
1074      //   .long _foo
1075      OutStreamer.EmitValue(MCSymbolRefExpr::
1076                            Create(Stubs[i].second.getPointer(),
1077                                   OutContext),
1078                            isPPC64 ? 8 : 4/*size*/);
1079    }
1080
1081    Stubs.clear();
1082    OutStreamer.AddBlankLine();
1083  }
1084
1085  // Funny Darwin hack: This flag tells the linker that no global symbols
1086  // contain code that falls through to other global symbols (e.g. the obvious
1087  // implementation of multiple entry points).  If this doesn't occur, the
1088  // linker can safely perform dead code stripping.  Since LLVM never generates
1089  // code that does this, it is always safe to set.
1090  OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1091
1092  return AsmPrinter::doFinalization(M);
1093}
1094
1095/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1096/// for a MachineFunction to the given output stream, in a format that the
1097/// Darwin assembler can deal with.
1098///
1099static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1100                                           MCStreamer &Streamer) {
1101  const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1102
1103  if (Subtarget->isDarwin())
1104    return new PPCDarwinAsmPrinter(tm, Streamer);
1105  return new PPCLinuxAsmPrinter(tm, Streamer);
1106}
1107
1108// Force static initialization.
1109extern "C" void LLVMInitializePowerPCAsmPrinter() {
1110  TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1111  TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1112}
1113