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"
60 using namespace llvm;
61 
62 namespace {
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.
128 static 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 
139 void 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, "$non_lazy_ptr");
209 
210         MachineModuleInfoImpl::StubValueTy &StubSym =
211           MMI->getObjFileInfo<MachineModuleInfoMachO>().
212                     getHiddenGVStubEntry(SymToPrint);
213         if (StubSym.getPointer() == 0)
214           StubSym = MachineModuleInfoImpl::
215             StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
216       } else {
217         SymToPrint = Mang->getSymbol(GV);
218       }
219     } else {
220       SymToPrint = Mang->getSymbol(GV);
221     }
222 
223     O << *SymToPrint;
224 
225     printOffset(MO.getOffset(), O);
226     return;
227   }
228 
229   default:
230     O << "<unknown operand type: " << MO.getType() << ">";
231     return;
232   }
233 }
234 
235 /// PrintAsmOperand - Print out an operand for an inline asm expression.
236 ///
237 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
238                                     unsigned AsmVariant,
239                                     const char *ExtraCode, raw_ostream &O) {
240   // Does this asm operand have a single letter operand modifier?
241   if (ExtraCode && ExtraCode[0]) {
242     if (ExtraCode[1] != 0) return true; // Unknown modifier.
243 
244     switch (ExtraCode[0]) {
245     default:
246       // See if this is a generic print operand
247       return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248     case 'c': // Don't print "$" 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 
275 bool 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.
306 MCSymbol *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 ///
325 void 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_PPC_TLSGD,
577                               OutContext);
578     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSGD)
579                                 .addExpr(TlsRef)
580                                 .addExpr(SymVar));
581     return;
582   }
583   case PPC::ADDIStlsldHA: {
584     // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
585     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
586     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
587     const MachineOperand &MO = MI->getOperand(2);
588     const GlobalValue *GValue = MO.getGlobal();
589     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
590     const MCExpr *SymGotTlsLD =
591       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
592                               OutContext);
593     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
594                                 .addReg(MI->getOperand(0).getReg())
595                                 .addReg(PPC::X2)
596                                 .addExpr(SymGotTlsLD));
597     return;
598   }
599   case PPC::ADDItlsldL: {
600     // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
601     // Into:      %Xd = ADDI8 %Xs, sym@got@tlsld@l
602     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
603     const MachineOperand &MO = MI->getOperand(2);
604     const GlobalValue *GValue = MO.getGlobal();
605     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
606     const MCExpr *SymGotTlsLD =
607       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
608                               OutContext);
609     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
610                                 .addReg(MI->getOperand(0).getReg())
611                                 .addReg(MI->getOperand(1).getReg())
612                                 .addExpr(SymGotTlsLD));
613     return;
614   }
615   case PPC::GETtlsldADDR: {
616     // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
617     // Into:      BL8_NOP_TLSLD __tls_get_addr(sym@tlsld)
618     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
619 
620     StringRef Name = "__tls_get_addr";
621     MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
622     const MCSymbolRefExpr *TlsRef =
623       MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
624     const MachineOperand &MO = MI->getOperand(2);
625     const GlobalValue *GValue = MO.getGlobal();
626     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
627     const MCExpr *SymVar =
628       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
629                               OutContext);
630     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSLD)
631                                 .addExpr(TlsRef)
632                                 .addExpr(SymVar));
633     return;
634   }
635   case PPC::ADDISdtprelHA: {
636     // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
637     // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
638     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
639     const MachineOperand &MO = MI->getOperand(2);
640     const GlobalValue *GValue = MO.getGlobal();
641     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
642     const MCExpr *SymDtprel =
643       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
644                               OutContext);
645     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
646                                 .addReg(MI->getOperand(0).getReg())
647                                 .addReg(PPC::X3)
648                                 .addExpr(SymDtprel));
649     return;
650   }
651   case PPC::ADDIdtprelL: {
652     // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
653     // Into:      %Xd = ADDI8 %Xs, sym@dtprel@l
654     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
655     const MachineOperand &MO = MI->getOperand(2);
656     const GlobalValue *GValue = MO.getGlobal();
657     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
658     const MCExpr *SymDtprel =
659       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
660                               OutContext);
661     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
662                                 .addReg(MI->getOperand(0).getReg())
663                                 .addReg(MI->getOperand(1).getReg())
664                                 .addExpr(SymDtprel));
665     return;
666   }
667   case PPC::MFCRpseud:
668   case PPC::MFCR8pseud:
669     // Transform: %R3 = MFCRpseud %CR7
670     // Into:      %R3 = MFCR      ;; cr7
671     OutStreamer.AddComment(PPCInstPrinter::
672                            getRegisterName(MI->getOperand(1).getReg()));
673     OutStreamer.EmitInstruction(MCInstBuilder(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR)
674       .addReg(MI->getOperand(0).getReg()));
675     return;
676   case PPC::SYNC:
677     // In Book E sync is called msync, handle this special case here...
678     if (Subtarget.isBookE()) {
679       OutStreamer.EmitRawText(StringRef("\tmsync"));
680       return;
681     }
682   }
683 
684   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
685   OutStreamer.EmitInstruction(TmpInst);
686 }
687 
688 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
689   if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
690     return AsmPrinter::EmitFunctionEntryLabel();
691 
692   // Emit an official procedure descriptor.
693   MCSectionSubPair Current = OutStreamer.getCurrentSection();
694   const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
695       ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
696       SectionKind::getReadOnly());
697   OutStreamer.SwitchSection(Section);
698   OutStreamer.EmitLabel(CurrentFnSym);
699   OutStreamer.EmitValueToAlignment(8);
700   MCSymbol *Symbol1 =
701     OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
702   // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
703   // entry point.
704   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
705 			8 /*size*/);
706   MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
707   // Generates a R_PPC64_TOC relocation for TOC base insertion.
708   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
709                         MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
710                         8/*size*/);
711   // Emit a null environment pointer.
712   OutStreamer.EmitIntValue(0, 8 /* size */);
713   OutStreamer.SwitchSection(Current.first, Current.second);
714 
715   MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
716                           ".L." + Twine(CurrentFnSym->getName()));
717   OutStreamer.EmitLabel(RealFnSym);
718   CurrentFnSymForSize = RealFnSym;
719 }
720 
721 
722 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
723   const DataLayout *TD = TM.getDataLayout();
724 
725   bool isPPC64 = TD->getPointerSizeInBits() == 64;
726 
727   if (isPPC64 && !TOC.empty()) {
728     const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
729         ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
730         SectionKind::getReadOnly());
731     OutStreamer.SwitchSection(Section);
732 
733     for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
734          E = TOC.end(); I != E; ++I) {
735       OutStreamer.EmitLabel(I->second);
736       MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
737       OutStreamer.EmitTCEntry(*S);
738     }
739   }
740 
741   MachineModuleInfoELF &MMIELF =
742     MMI->getObjFileInfo<MachineModuleInfoELF>();
743 
744   MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
745   if (!Stubs.empty()) {
746     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
747     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
748       // L_foo$stub:
749       OutStreamer.EmitLabel(Stubs[i].first);
750       //   .long _foo
751       OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
752                                                     OutContext),
753                             isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
754     }
755 
756     Stubs.clear();
757     OutStreamer.AddBlankLine();
758   }
759 
760   return AsmPrinter::doFinalization(M);
761 }
762 
763 /// EmitFunctionBodyEnd - Print the traceback table before the .size
764 /// directive.
765 ///
766 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
767   // Only the 64-bit target requires a traceback table.  For now,
768   // we only emit the word of zeroes that GDB requires to find
769   // the end of the function, and zeroes for the eight-byte
770   // mandatory fields.
771   // FIXME: We should fill in the eight-byte mandatory fields as described in
772   // the PPC64 ELF ABI (this is a low-priority item because GDB does not
773   // currently make use of these fields).
774   if (Subtarget.isPPC64()) {
775     OutStreamer.EmitIntValue(0, 4/*size*/);
776     OutStreamer.EmitIntValue(0, 8/*size*/);
777   }
778 }
779 
780 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
781   static const char *const CPUDirectives[] = {
782     "",
783     "ppc",
784     "ppc440",
785     "ppc601",
786     "ppc602",
787     "ppc603",
788     "ppc7400",
789     "ppc750",
790     "ppc970",
791     "ppcA2",
792     "ppce500mc",
793     "ppce5500",
794     "power3",
795     "power4",
796     "power5",
797     "power5x",
798     "power6",
799     "power6x",
800     "power7",
801     "ppc64"
802   };
803 
804   unsigned Directive = Subtarget.getDarwinDirective();
805   if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
806     Directive = PPC::DIR_970;
807   if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
808     Directive = PPC::DIR_7400;
809   if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
810     Directive = PPC::DIR_64;
811   assert(Directive <= PPC::DIR_64 && "Directive out of range.");
812 
813   // FIXME: This is a total hack, finish mc'izing the PPC backend.
814   if (OutStreamer.hasRawTextSupport()) {
815     assert(Directive < sizeof(CPUDirectives) / sizeof(*CPUDirectives) &&
816            "CPUDirectives[] might not be up-to-date!");
817     OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
818   }
819 
820   // Prime text sections so they are adjacent.  This reduces the likelihood a
821   // large data or debug section causes a branch to exceed 16M limit.
822   const TargetLoweringObjectFileMachO &TLOFMacho =
823     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
824   OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
825   if (TM.getRelocationModel() == Reloc::PIC_) {
826     OutStreamer.SwitchSection(
827            OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
828                                       MCSectionMachO::S_SYMBOL_STUBS |
829                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
830                                       32, SectionKind::getText()));
831   } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
832     OutStreamer.SwitchSection(
833            OutContext.getMachOSection("__TEXT","__symbol_stub1",
834                                       MCSectionMachO::S_SYMBOL_STUBS |
835                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
836                                       16, SectionKind::getText()));
837   }
838   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
839 }
840 
841 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
842   // Remove $stub suffix, add $lazy_ptr.
843   StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
844   return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
845 }
846 
847 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
848   // Add $tmp suffix to $stub, yielding $stub$tmp.
849   return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
850 }
851 
852 void PPCDarwinAsmPrinter::
853 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
854   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
855 
856   const TargetLoweringObjectFileMachO &TLOFMacho =
857     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
858 
859   // .lazy_symbol_pointer
860   const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
861 
862   // Output stubs for dynamically-linked functions
863   if (TM.getRelocationModel() == Reloc::PIC_) {
864     const MCSection *StubSection =
865     OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
866                                MCSectionMachO::S_SYMBOL_STUBS |
867                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
868                                32, SectionKind::getText());
869     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
870       OutStreamer.SwitchSection(StubSection);
871       EmitAlignment(4);
872 
873       MCSymbol *Stub = Stubs[i].first;
874       MCSymbol *RawSym = Stubs[i].second.getPointer();
875       MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
876       MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
877 
878       OutStreamer.EmitLabel(Stub);
879       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
880 
881       const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
882       const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
883       const MCExpr *Sub =
884         MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
885 
886       // mflr r0
887       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
888       // bcl 20, 31, AnonSymbol
889       OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCLalways).addExpr(Anon));
890       OutStreamer.EmitLabel(AnonSymbol);
891       // mflr r11
892       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
893       // addis r11, r11, ha16(LazyPtr - AnonSymbol)
894       const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, OutContext);
895       OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
896         .addReg(PPC::R11)
897         .addReg(PPC::R11)
898         .addExpr(SubHa16));
899       // mtlr r0
900       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
901 
902       // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
903       // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
904       const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, OutContext);
905       OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
906         .addReg(PPC::R12)
907         .addExpr(SubLo16).addExpr(SubLo16)
908         .addReg(PPC::R11));
909       // mtctr r12
910       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
911       // bctr
912       OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
913 
914       OutStreamer.SwitchSection(LSPSection);
915       OutStreamer.EmitLabel(LazyPtr);
916       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
917 
918       MCSymbol *DyldStubBindingHelper =
919         OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
920       if (isPPC64) {
921         // .quad dyld_stub_binding_helper
922         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
923       } else {
924         // .long dyld_stub_binding_helper
925         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
926       }
927     }
928     OutStreamer.AddBlankLine();
929     return;
930   }
931 
932   const MCSection *StubSection =
933     OutContext.getMachOSection("__TEXT","__symbol_stub1",
934                                MCSectionMachO::S_SYMBOL_STUBS |
935                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
936                                16, SectionKind::getText());
937   for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
938     MCSymbol *Stub = Stubs[i].first;
939     MCSymbol *RawSym = Stubs[i].second.getPointer();
940     MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
941     const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
942 
943     OutStreamer.SwitchSection(StubSection);
944     EmitAlignment(4);
945     OutStreamer.EmitLabel(Stub);
946     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
947 
948     // lis r11, ha16(LazyPtr)
949     const MCExpr *LazyPtrHa16 = PPCMCExpr::CreateHa(LazyPtrExpr, OutContext);
950     OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
951       .addReg(PPC::R11)
952       .addExpr(LazyPtrHa16));
953 
954     // ldu r12, lo16(LazyPtr)(r11)
955     // lwzu r12, lo16(LazyPtr)(r11)
956     const MCExpr *LazyPtrLo16 = PPCMCExpr::CreateLo(LazyPtrExpr, OutContext);
957     OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
958       .addReg(PPC::R12)
959       .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
960       .addReg(PPC::R11));
961 
962     // mtctr r12
963     OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
964     // bctr
965     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
966 
967     OutStreamer.SwitchSection(LSPSection);
968     OutStreamer.EmitLabel(LazyPtr);
969     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
970 
971     MCSymbol *DyldStubBindingHelper =
972       OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
973     if (isPPC64) {
974       // .quad dyld_stub_binding_helper
975       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
976     } else {
977       // .long dyld_stub_binding_helper
978       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
979     }
980   }
981 
982   OutStreamer.AddBlankLine();
983 }
984 
985 
986 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
987   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
988 
989   // Darwin/PPC always uses mach-o.
990   const TargetLoweringObjectFileMachO &TLOFMacho =
991     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
992   MachineModuleInfoMachO &MMIMacho =
993     MMI->getObjFileInfo<MachineModuleInfoMachO>();
994 
995   MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
996   if (!Stubs.empty())
997     EmitFunctionStubs(Stubs);
998 
999   if (MAI->doesSupportExceptionHandling() && MMI) {
1000     // Add the (possibly multiple) personalities to the set of global values.
1001     // Only referenced functions get into the Personalities list.
1002     const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1003     for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1004          E = Personalities.end(); I != E; ++I) {
1005       if (*I) {
1006         MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1007         MachineModuleInfoImpl::StubValueTy &StubSym =
1008           MMIMacho.getGVStubEntry(NLPSym);
1009         StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1010       }
1011     }
1012   }
1013 
1014   // Output stubs for dynamically-linked functions.
1015   Stubs = MMIMacho.GetGVStubList();
1016 
1017   // Output macho stubs for external and common global variables.
1018   if (!Stubs.empty()) {
1019     // Switch with ".non_lazy_symbol_pointer" directive.
1020     OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1021     EmitAlignment(isPPC64 ? 3 : 2);
1022 
1023     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1024       // L_foo$stub:
1025       OutStreamer.EmitLabel(Stubs[i].first);
1026       //   .indirect_symbol _foo
1027       MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1028       OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1029 
1030       if (MCSym.getInt())
1031         // External to current translation unit.
1032         OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1033       else
1034         // Internal to current translation unit.
1035         //
1036         // When we place the LSDA into the TEXT section, the type info pointers
1037         // need to be indirect and pc-rel. We accomplish this by using NLPs.
1038         // However, sometimes the types are local to the file. So we need to
1039         // fill in the value for the NLP in those cases.
1040         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1041                                                       OutContext),
1042                               isPPC64 ? 8 : 4/*size*/);
1043     }
1044 
1045     Stubs.clear();
1046     OutStreamer.AddBlankLine();
1047   }
1048 
1049   Stubs = MMIMacho.GetHiddenGVStubList();
1050   if (!Stubs.empty()) {
1051     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1052     EmitAlignment(isPPC64 ? 3 : 2);
1053 
1054     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1055       // L_foo$stub:
1056       OutStreamer.EmitLabel(Stubs[i].first);
1057       //   .long _foo
1058       OutStreamer.EmitValue(MCSymbolRefExpr::
1059                             Create(Stubs[i].second.getPointer(),
1060                                    OutContext),
1061                             isPPC64 ? 8 : 4/*size*/);
1062     }
1063 
1064     Stubs.clear();
1065     OutStreamer.AddBlankLine();
1066   }
1067 
1068   // Funny Darwin hack: This flag tells the linker that no global symbols
1069   // contain code that falls through to other global symbols (e.g. the obvious
1070   // implementation of multiple entry points).  If this doesn't occur, the
1071   // linker can safely perform dead code stripping.  Since LLVM never generates
1072   // code that does this, it is always safe to set.
1073   OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1074 
1075   return AsmPrinter::doFinalization(M);
1076 }
1077 
1078 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1079 /// for a MachineFunction to the given output stream, in a format that the
1080 /// Darwin assembler can deal with.
1081 ///
1082 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1083                                            MCStreamer &Streamer) {
1084   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1085 
1086   if (Subtarget->isDarwin())
1087     return new PPCDarwinAsmPrinter(tm, Streamer);
1088   return new PPCLinuxAsmPrinter(tm, Streamer);
1089 }
1090 
1091 // Force static initialization.
1092 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1093   TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1094   TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1095 }
1096