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, Subtarget.isDarwin());
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, Subtarget.isDarwin());
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, Subtarget.isDarwin());
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, Subtarget.isDarwin());
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, Subtarget.isDarwin());
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_TLS __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_TLS)
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_TLS __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_TLS)
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::MFOCRF:
668   case PPC::MFOCRF8:
669     if (!Subtarget.hasMFOCRF()) {
670       // Transform: %R3 = MFOCRF %CR7
671       // Into:      %R3 = MFCR   ;; cr7
672       unsigned NewOpcode =
673         MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
674       OutStreamer.AddComment(PPCInstPrinter::
675                              getRegisterName(MI->getOperand(1).getReg()));
676       OutStreamer.EmitInstruction(MCInstBuilder(NewOpcode)
677                                   .addReg(MI->getOperand(0).getReg()));
678       return;
679     }
680     break;
681   case PPC::MTOCRF:
682   case PPC::MTOCRF8:
683     if (!Subtarget.hasMFOCRF()) {
684       // Transform: %CR7 = MTOCRF %R3
685       // Into:      MTCRF mask, %R3 ;; cr7
686       unsigned NewOpcode =
687         MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
688       unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
689                               ->getEncodingValue(MI->getOperand(0).getReg());
690       OutStreamer.AddComment(PPCInstPrinter::
691                              getRegisterName(MI->getOperand(0).getReg()));
692       OutStreamer.EmitInstruction(MCInstBuilder(NewOpcode)
693                                   .addImm(Mask)
694                                   .addReg(MI->getOperand(1).getReg()));
695       return;
696     }
697     break;
698   case PPC::SYNC:
699     // In Book E sync is called msync, handle this special case here...
700     if (Subtarget.isBookE()) {
701       OutStreamer.EmitRawText(StringRef("\tmsync"));
702       return;
703     }
704     break;
705   case PPC::LD:
706   case PPC::STD:
707   case PPC::LWA_32:
708   case PPC::LWA: {
709     // Verify alignment is legal, so we don't create relocations
710     // that can't be supported.
711     // FIXME:  This test is currently disabled for Darwin.  The test
712     // suite shows a handful of test cases that fail this check for
713     // Darwin.  Those need to be investigated before this sanity test
714     // can be enabled for those subtargets.
715     if (!Subtarget.isDarwin()) {
716       unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
717       const MachineOperand &MO = MI->getOperand(OpNum);
718       if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
719         llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
720     }
721     // Now process the instruction normally.
722     break;
723   }
724   }
725 
726   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
727   OutStreamer.EmitInstruction(TmpInst);
728 }
729 
730 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
731   if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
732     return AsmPrinter::EmitFunctionEntryLabel();
733 
734   // Emit an official procedure descriptor.
735   MCSectionSubPair Current = OutStreamer.getCurrentSection();
736   const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
737       ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
738       SectionKind::getReadOnly());
739   OutStreamer.SwitchSection(Section);
740   OutStreamer.EmitLabel(CurrentFnSym);
741   OutStreamer.EmitValueToAlignment(8);
742   MCSymbol *Symbol1 =
743     OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
744   // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
745   // entry point.
746   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
747 			8 /*size*/);
748   MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
749   // Generates a R_PPC64_TOC relocation for TOC base insertion.
750   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
751                         MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
752                         8/*size*/);
753   // Emit a null environment pointer.
754   OutStreamer.EmitIntValue(0, 8 /* size */);
755   OutStreamer.SwitchSection(Current.first, Current.second);
756 
757   MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
758                           ".L." + Twine(CurrentFnSym->getName()));
759   OutStreamer.EmitLabel(RealFnSym);
760   CurrentFnSymForSize = RealFnSym;
761 }
762 
763 
764 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
765   const DataLayout *TD = TM.getDataLayout();
766 
767   bool isPPC64 = TD->getPointerSizeInBits() == 64;
768 
769   if (isPPC64 && !TOC.empty()) {
770     const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
771         ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
772         SectionKind::getReadOnly());
773     OutStreamer.SwitchSection(Section);
774 
775     for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
776          E = TOC.end(); I != E; ++I) {
777       OutStreamer.EmitLabel(I->second);
778       MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
779       OutStreamer.EmitTCEntry(*S);
780     }
781   }
782 
783   MachineModuleInfoELF &MMIELF =
784     MMI->getObjFileInfo<MachineModuleInfoELF>();
785 
786   MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
787   if (!Stubs.empty()) {
788     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
789     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
790       // L_foo$stub:
791       OutStreamer.EmitLabel(Stubs[i].first);
792       //   .long _foo
793       OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
794                                                     OutContext),
795                             isPPC64 ? 8 : 4/*size*/);
796     }
797 
798     Stubs.clear();
799     OutStreamer.AddBlankLine();
800   }
801 
802   return AsmPrinter::doFinalization(M);
803 }
804 
805 /// EmitFunctionBodyEnd - Print the traceback table before the .size
806 /// directive.
807 ///
808 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
809   // Only the 64-bit target requires a traceback table.  For now,
810   // we only emit the word of zeroes that GDB requires to find
811   // the end of the function, and zeroes for the eight-byte
812   // mandatory fields.
813   // FIXME: We should fill in the eight-byte mandatory fields as described in
814   // the PPC64 ELF ABI (this is a low-priority item because GDB does not
815   // currently make use of these fields).
816   if (Subtarget.isPPC64()) {
817     OutStreamer.EmitIntValue(0, 4/*size*/);
818     OutStreamer.EmitIntValue(0, 8/*size*/);
819   }
820 }
821 
822 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
823   static const char *const CPUDirectives[] = {
824     "",
825     "ppc",
826     "ppc440",
827     "ppc601",
828     "ppc602",
829     "ppc603",
830     "ppc7400",
831     "ppc750",
832     "ppc970",
833     "ppcA2",
834     "ppce500mc",
835     "ppce5500",
836     "power3",
837     "power4",
838     "power5",
839     "power5x",
840     "power6",
841     "power6x",
842     "power7",
843     "ppc64",
844     "ppc64le"
845   };
846 
847   unsigned Directive = Subtarget.getDarwinDirective();
848   if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
849     Directive = PPC::DIR_970;
850   if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
851     Directive = PPC::DIR_7400;
852   if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
853     Directive = PPC::DIR_64;
854   assert(Directive <= PPC::DIR_64 && "Directive out of range.");
855 
856   // FIXME: This is a total hack, finish mc'izing the PPC backend.
857   if (OutStreamer.hasRawTextSupport()) {
858     assert(Directive < array_lengthof(CPUDirectives) &&
859            "CPUDirectives[] might not be up-to-date!");
860     OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
861   }
862 
863   // Prime text sections so they are adjacent.  This reduces the likelihood a
864   // large data or debug section causes a branch to exceed 16M limit.
865   const TargetLoweringObjectFileMachO &TLOFMacho =
866     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
867   OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
868   if (TM.getRelocationModel() == Reloc::PIC_) {
869     OutStreamer.SwitchSection(
870            OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
871                                       MCSectionMachO::S_SYMBOL_STUBS |
872                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
873                                       32, SectionKind::getText()));
874   } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
875     OutStreamer.SwitchSection(
876            OutContext.getMachOSection("__TEXT","__symbol_stub1",
877                                       MCSectionMachO::S_SYMBOL_STUBS |
878                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
879                                       16, SectionKind::getText()));
880   }
881   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
882 }
883 
884 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
885   // Remove $stub suffix, add $lazy_ptr.
886   StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
887   return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
888 }
889 
890 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
891   // Add $tmp suffix to $stub, yielding $stub$tmp.
892   return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
893 }
894 
895 void PPCDarwinAsmPrinter::
896 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
897   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
898   bool isDarwin = Subtarget.isDarwin();
899 
900   const TargetLoweringObjectFileMachO &TLOFMacho =
901     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
902 
903   // .lazy_symbol_pointer
904   const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
905 
906   // Output stubs for dynamically-linked functions
907   if (TM.getRelocationModel() == Reloc::PIC_) {
908     const MCSection *StubSection =
909     OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
910                                MCSectionMachO::S_SYMBOL_STUBS |
911                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
912                                32, SectionKind::getText());
913     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
914       OutStreamer.SwitchSection(StubSection);
915       EmitAlignment(4);
916 
917       MCSymbol *Stub = Stubs[i].first;
918       MCSymbol *RawSym = Stubs[i].second.getPointer();
919       MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
920       MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
921 
922       OutStreamer.EmitLabel(Stub);
923       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
924 
925       const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
926       const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
927       const MCExpr *Sub =
928         MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
929 
930       // mflr r0
931       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
932       // bcl 20, 31, AnonSymbol
933       OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCLalways).addExpr(Anon));
934       OutStreamer.EmitLabel(AnonSymbol);
935       // mflr r11
936       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
937       // addis r11, r11, ha16(LazyPtr - AnonSymbol)
938       const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
939       OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
940         .addReg(PPC::R11)
941         .addReg(PPC::R11)
942         .addExpr(SubHa16));
943       // mtlr r0
944       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
945 
946       // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
947       // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
948       const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
949       OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
950         .addReg(PPC::R12)
951         .addExpr(SubLo16).addExpr(SubLo16)
952         .addReg(PPC::R11));
953       // mtctr r12
954       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
955       // bctr
956       OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
957 
958       OutStreamer.SwitchSection(LSPSection);
959       OutStreamer.EmitLabel(LazyPtr);
960       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
961 
962       MCSymbol *DyldStubBindingHelper =
963         OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
964       if (isPPC64) {
965         // .quad dyld_stub_binding_helper
966         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
967       } else {
968         // .long dyld_stub_binding_helper
969         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
970       }
971     }
972     OutStreamer.AddBlankLine();
973     return;
974   }
975 
976   const MCSection *StubSection =
977     OutContext.getMachOSection("__TEXT","__symbol_stub1",
978                                MCSectionMachO::S_SYMBOL_STUBS |
979                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
980                                16, SectionKind::getText());
981   for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
982     MCSymbol *Stub = Stubs[i].first;
983     MCSymbol *RawSym = Stubs[i].second.getPointer();
984     MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
985     const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
986 
987     OutStreamer.SwitchSection(StubSection);
988     EmitAlignment(4);
989     OutStreamer.EmitLabel(Stub);
990     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
991 
992     // lis r11, ha16(LazyPtr)
993     const MCExpr *LazyPtrHa16 =
994       PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
995     OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
996       .addReg(PPC::R11)
997       .addExpr(LazyPtrHa16));
998 
999     // ldu r12, lo16(LazyPtr)(r11)
1000     // lwzu r12, lo16(LazyPtr)(r11)
1001     const MCExpr *LazyPtrLo16 =
1002       PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1003     OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1004       .addReg(PPC::R12)
1005       .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1006       .addReg(PPC::R11));
1007 
1008     // mtctr r12
1009     OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1010     // bctr
1011     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
1012 
1013     OutStreamer.SwitchSection(LSPSection);
1014     OutStreamer.EmitLabel(LazyPtr);
1015     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1016 
1017     MCSymbol *DyldStubBindingHelper =
1018       OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1019     if (isPPC64) {
1020       // .quad dyld_stub_binding_helper
1021       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1022     } else {
1023       // .long dyld_stub_binding_helper
1024       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1025     }
1026   }
1027 
1028   OutStreamer.AddBlankLine();
1029 }
1030 
1031 
1032 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1033   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1034 
1035   // Darwin/PPC always uses mach-o.
1036   const TargetLoweringObjectFileMachO &TLOFMacho =
1037     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1038   MachineModuleInfoMachO &MMIMacho =
1039     MMI->getObjFileInfo<MachineModuleInfoMachO>();
1040 
1041   MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1042   if (!Stubs.empty())
1043     EmitFunctionStubs(Stubs);
1044 
1045   if (MAI->doesSupportExceptionHandling() && MMI) {
1046     // Add the (possibly multiple) personalities to the set of global values.
1047     // Only referenced functions get into the Personalities list.
1048     const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1049     for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1050          E = Personalities.end(); I != E; ++I) {
1051       if (*I) {
1052         MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1053         MachineModuleInfoImpl::StubValueTy &StubSym =
1054           MMIMacho.getGVStubEntry(NLPSym);
1055         StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1056       }
1057     }
1058   }
1059 
1060   // Output stubs for dynamically-linked functions.
1061   Stubs = MMIMacho.GetGVStubList();
1062 
1063   // Output macho stubs for external and common global variables.
1064   if (!Stubs.empty()) {
1065     // Switch with ".non_lazy_symbol_pointer" directive.
1066     OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1067     EmitAlignment(isPPC64 ? 3 : 2);
1068 
1069     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1070       // L_foo$stub:
1071       OutStreamer.EmitLabel(Stubs[i].first);
1072       //   .indirect_symbol _foo
1073       MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1074       OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1075 
1076       if (MCSym.getInt())
1077         // External to current translation unit.
1078         OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1079       else
1080         // Internal to current translation unit.
1081         //
1082         // When we place the LSDA into the TEXT section, the type info pointers
1083         // need to be indirect and pc-rel. We accomplish this by using NLPs.
1084         // However, sometimes the types are local to the file. So we need to
1085         // fill in the value for the NLP in those cases.
1086         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1087                                                       OutContext),
1088                               isPPC64 ? 8 : 4/*size*/);
1089     }
1090 
1091     Stubs.clear();
1092     OutStreamer.AddBlankLine();
1093   }
1094 
1095   Stubs = MMIMacho.GetHiddenGVStubList();
1096   if (!Stubs.empty()) {
1097     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1098     EmitAlignment(isPPC64 ? 3 : 2);
1099 
1100     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1101       // L_foo$stub:
1102       OutStreamer.EmitLabel(Stubs[i].first);
1103       //   .long _foo
1104       OutStreamer.EmitValue(MCSymbolRefExpr::
1105                             Create(Stubs[i].second.getPointer(),
1106                                    OutContext),
1107                             isPPC64 ? 8 : 4/*size*/);
1108     }
1109 
1110     Stubs.clear();
1111     OutStreamer.AddBlankLine();
1112   }
1113 
1114   // Funny Darwin hack: This flag tells the linker that no global symbols
1115   // contain code that falls through to other global symbols (e.g. the obvious
1116   // implementation of multiple entry points).  If this doesn't occur, the
1117   // linker can safely perform dead code stripping.  Since LLVM never generates
1118   // code that does this, it is always safe to set.
1119   OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1120 
1121   return AsmPrinter::doFinalization(M);
1122 }
1123 
1124 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1125 /// for a MachineFunction to the given output stream, in a format that the
1126 /// Darwin assembler can deal with.
1127 ///
1128 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1129                                            MCStreamer &Streamer) {
1130   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1131 
1132   if (Subtarget->isDarwin())
1133     return new PPCDarwinAsmPrinter(tm, Streamer);
1134   return new PPCLinuxAsmPrinter(tm, Streamer);
1135 }
1136 
1137 // Force static initialization.
1138 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1139   TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1140   TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1141 }
1142