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 #include "PPC.h"
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCMachineFunctionInfo.h"
24 #include "PPCSubtarget.h"
25 #include "PPCTargetMachine.h"
26 #include "PPCTargetStreamer.h"
27 #include "llvm/ADT/MapVector.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/CodeGen/AsmPrinter.h"
31 #include "llvm/CodeGen/MachineConstantPool.h"
32 #include "llvm/CodeGen/MachineFunctionPass.h"
33 #include "llvm/CodeGen/MachineInstr.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
36 #include "llvm/CodeGen/MachineRegisterInfo.h"
37 #include "llvm/CodeGen/StackMaps.h"
38 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DebugInfo.h"
41 #include "llvm/IR/DerivedTypes.h"
42 #include "llvm/IR/Mangler.h"
43 #include "llvm/IR/Module.h"
44 #include "llvm/MC/MCAsmInfo.h"
45 #include "llvm/MC/MCContext.h"
46 #include "llvm/MC/MCExpr.h"
47 #include "llvm/MC/MCInst.h"
48 #include "llvm/MC/MCInstBuilder.h"
49 #include "llvm/MC/MCSectionELF.h"
50 #include "llvm/MC/MCSectionMachO.h"
51 #include "llvm/MC/MCStreamer.h"
52 #include "llvm/MC/MCSymbol.h"
53 #include "llvm/Support/CommandLine.h"
54 #include "llvm/Support/Debug.h"
55 #include "llvm/Support/ELF.h"
56 #include "llvm/Support/ErrorHandling.h"
57 #include "llvm/Support/MathExtras.h"
58 #include "llvm/Support/TargetRegistry.h"
59 #include "llvm/Support/raw_ostream.h"
60 #include "llvm/Target/TargetInstrInfo.h"
61 #include "llvm/Target/TargetOptions.h"
62 #include "llvm/Target/TargetRegisterInfo.h"
63 using namespace llvm;
64 
65 #define DEBUG_TYPE "asmprinter"
66 
67 namespace {
68   class PPCAsmPrinter : public AsmPrinter {
69   protected:
70     MapVector<MCSymbol*, MCSymbol*> TOC;
71     const PPCSubtarget &Subtarget;
72     uint64_t TOCLabelID;
73     StackMaps SM;
74   public:
75     explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
76       : AsmPrinter(TM, Streamer),
77         Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0), SM(*this) {}
78 
79     const char *getPassName() const override {
80       return "PowerPC Assembly Printer";
81     }
82 
83     MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
84 
85     void EmitInstruction(const MachineInstr *MI) override;
86 
87     void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
88 
89     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
90                          unsigned AsmVariant, const char *ExtraCode,
91                          raw_ostream &O) override;
92     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
93                                unsigned AsmVariant, const char *ExtraCode,
94                                raw_ostream &O) override;
95 
96     void EmitEndOfAsmFile(Module &M) override;
97 
98     void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
99                        const MachineInstr &MI);
100     void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
101                          const MachineInstr &MI);
102   };
103 
104   /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
105   class PPCLinuxAsmPrinter : public PPCAsmPrinter {
106   public:
107     explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
108       : PPCAsmPrinter(TM, Streamer) {}
109 
110     const char *getPassName() const override {
111       return "Linux PPC Assembly Printer";
112     }
113 
114     bool doFinalization(Module &M) override;
115     void EmitStartOfAsmFile(Module &M) override;
116 
117     void EmitFunctionEntryLabel() override;
118 
119     void EmitFunctionBodyStart() override;
120     void EmitFunctionBodyEnd() override;
121   };
122 
123   /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
124   /// OS X
125   class PPCDarwinAsmPrinter : public PPCAsmPrinter {
126   public:
127     explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
128       : PPCAsmPrinter(TM, Streamer) {}
129 
130     const char *getPassName() const override {
131       return "Darwin PPC Assembly Printer";
132     }
133 
134     bool doFinalization(Module &M) override;
135     void EmitStartOfAsmFile(Module &M) override;
136 
137     void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
138   };
139 } // end of anonymous namespace
140 
141 /// stripRegisterPrefix - This method strips the character prefix from a
142 /// register name so that only the number is left.  Used by for linux asm.
143 static const char *stripRegisterPrefix(const char *RegName) {
144   switch (RegName[0]) {
145     case 'r':
146     case 'f':
147     case 'v':
148       if (RegName[1] == 's')
149         return RegName + 2;
150       return RegName + 1;
151     case 'c': if (RegName[1] == 'r') return RegName + 2;
152   }
153 
154   return RegName;
155 }
156 
157 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
158                                  raw_ostream &O) {
159   const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
160   const MachineOperand &MO = MI->getOperand(OpNo);
161 
162   switch (MO.getType()) {
163   case MachineOperand::MO_Register: {
164     const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
165     // Linux assembler (Others?) does not take register mnemonics.
166     // FIXME - What about special registers used in mfspr/mtspr?
167     if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
168     O << RegName;
169     return;
170   }
171   case MachineOperand::MO_Immediate:
172     O << MO.getImm();
173     return;
174 
175   case MachineOperand::MO_MachineBasicBlock:
176     O << *MO.getMBB()->getSymbol();
177     return;
178   case MachineOperand::MO_ConstantPoolIndex:
179     O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
180       << '_' << MO.getIndex();
181     return;
182   case MachineOperand::MO_BlockAddress:
183     O << *GetBlockAddressSymbol(MO.getBlockAddress());
184     return;
185   case MachineOperand::MO_GlobalAddress: {
186     // Computing the address of a global symbol, not calling it.
187     const GlobalValue *GV = MO.getGlobal();
188     MCSymbol *SymToPrint;
189 
190     // External or weakly linked global variables need non-lazily-resolved stubs
191     if (TM.getRelocationModel() != Reloc::Static &&
192         (GV->isDeclaration() || GV->isWeakForLinker())) {
193       if (!GV->hasHiddenVisibility()) {
194         SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
195         MachineModuleInfoImpl::StubValueTy &StubSym =
196           MMI->getObjFileInfo<MachineModuleInfoMachO>()
197             .getGVStubEntry(SymToPrint);
198         if (!StubSym.getPointer())
199           StubSym = MachineModuleInfoImpl::
200             StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
201       } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
202                  GV->hasAvailableExternallyLinkage()) {
203         SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
204 
205         MachineModuleInfoImpl::StubValueTy &StubSym =
206           MMI->getObjFileInfo<MachineModuleInfoMachO>().
207                     getHiddenGVStubEntry(SymToPrint);
208         if (!StubSym.getPointer())
209           StubSym = MachineModuleInfoImpl::
210             StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
211       } else {
212         SymToPrint = getSymbol(GV);
213       }
214     } else {
215       SymToPrint = getSymbol(GV);
216     }
217 
218     O << *SymToPrint;
219 
220     printOffset(MO.getOffset(), O);
221     return;
222   }
223 
224   default:
225     O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
226     return;
227   }
228 }
229 
230 /// PrintAsmOperand - Print out an operand for an inline asm expression.
231 ///
232 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
233                                     unsigned AsmVariant,
234                                     const char *ExtraCode, raw_ostream &O) {
235   // Does this asm operand have a single letter operand modifier?
236   if (ExtraCode && ExtraCode[0]) {
237     if (ExtraCode[1] != 0) return true; // Unknown modifier.
238 
239     switch (ExtraCode[0]) {
240     default:
241       // See if this is a generic print operand
242       return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
243     case 'c': // Don't print "$" before a global var name or constant.
244       break; // PPC never has a prefix.
245     case 'L': // Write second word of DImode reference.
246       // Verify that this operand has two consecutive registers.
247       if (!MI->getOperand(OpNo).isReg() ||
248           OpNo+1 == MI->getNumOperands() ||
249           !MI->getOperand(OpNo+1).isReg())
250         return true;
251       ++OpNo;   // Return the high-part.
252       break;
253     case 'I':
254       // Write 'i' if an integer constant, otherwise nothing.  Used to print
255       // addi vs add, etc.
256       if (MI->getOperand(OpNo).isImm())
257         O << "i";
258       return false;
259     }
260   }
261 
262   printOperand(MI, OpNo, O);
263   return false;
264 }
265 
266 // At the moment, all inline asm memory operands are a single register.
267 // In any case, the output of this routine should always be just one
268 // assembler operand.
269 
270 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
271                                           unsigned AsmVariant,
272                                           const char *ExtraCode,
273                                           raw_ostream &O) {
274   if (ExtraCode && ExtraCode[0]) {
275     if (ExtraCode[1] != 0) return true; // Unknown modifier.
276 
277     switch (ExtraCode[0]) {
278     default: return true;  // Unknown modifier.
279     case 'y': // A memory reference for an X-form instruction
280       {
281         const char *RegName = "r0";
282         if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
283         O << RegName << ", ";
284         printOperand(MI, OpNo, O);
285         return false;
286       }
287     case 'U': // Print 'u' for update form.
288     case 'X': // Print 'x' for indexed form.
289       {
290 	// FIXME: Currently for PowerPC memory operands are always loaded
291 	// into a register, so we never get an update or indexed form.
292 	// This is bad even for offset forms, since even if we know we
293 	// have a value in -16(r1), we will generate a load into r<n>
294 	// and then load from 0(r<n>).  Until that issue is fixed,
295 	// tolerate 'U' and 'X' but don't output anything.
296 	assert(MI->getOperand(OpNo).isReg());
297 	return false;
298       }
299     }
300   }
301 
302   assert(MI->getOperand(OpNo).isReg());
303   O << "0(";
304   printOperand(MI, OpNo, O);
305   O << ")";
306   return false;
307 }
308 
309 
310 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
311 /// exists for it.  If not, create one.  Then return a symbol that references
312 /// the TOC entry.
313 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
314   const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
315   MCSymbol *&TOCEntry = TOC[Sym];
316 
317   // To avoid name clash check if the name already exists.
318   while (!TOCEntry) {
319     if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
320                                 "C" + Twine(TOCLabelID++)) == nullptr) {
321       TOCEntry = GetTempSymbol("C", TOCLabelID);
322     }
323   }
324 
325   return TOCEntry;
326 }
327 
328 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
329   SM.serializeToStackMapSection();
330 }
331 
332 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
333                                   const MachineInstr &MI) {
334   unsigned NumNOPBytes = MI.getOperand(1).getImm();
335 
336   SM.recordStackMap(MI);
337   assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
338 
339   // Scan ahead to trim the shadow.
340   const MachineBasicBlock &MBB = *MI.getParent();
341   MachineBasicBlock::const_iterator MII(MI);
342   ++MII;
343   while (NumNOPBytes > 0) {
344     if (MII == MBB.end() || MII->isCall() ||
345         MII->getOpcode() == PPC::DBG_VALUE ||
346         MII->getOpcode() == TargetOpcode::PATCHPOINT ||
347         MII->getOpcode() == TargetOpcode::STACKMAP)
348       break;
349     ++MII;
350     NumNOPBytes -= 4;
351   }
352 
353   // Emit nops.
354   for (unsigned i = 0; i < NumNOPBytes; i += 4)
355     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
356 }
357 
358 // Lower a patchpoint of the form:
359 // [<def>], <id>, <numBytes>, <target>, <numArgs>
360 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
361                                     const MachineInstr &MI) {
362   SM.recordPatchPoint(MI);
363   PatchPointOpers Opers(&MI);
364 
365   int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
366   unsigned EncodedBytes = 0;
367   if (CallTarget) {
368     assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
369            "High 16 bits of call target should be zero.");
370     unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
371     EncodedBytes = 6*4;
372     // Materialize the jump address:
373     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
374                                     .addReg(ScratchReg)
375                                     .addImm((CallTarget >> 32) & 0xFFFF));
376     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
377                                     .addReg(ScratchReg)
378                                     .addReg(ScratchReg)
379                                     .addImm(32).addImm(16));
380     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
381                                     .addReg(ScratchReg)
382                                     .addReg(ScratchReg)
383                                     .addImm((CallTarget >> 16) & 0xFFFF));
384     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
385                                     .addReg(ScratchReg)
386                                     .addReg(ScratchReg)
387                                     .addImm(CallTarget & 0xFFFF));
388 
389     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
390     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
391   }
392 
393   // Emit padding.
394   unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
395   assert(NumBytes >= EncodedBytes &&
396          "Patchpoint can't request size less than the length of a call.");
397   assert((NumBytes - EncodedBytes) % 4 == 0 &&
398          "Invalid number of NOP bytes requested!");
399   for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
400     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
401 }
402 
403 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
404 /// the current output stream.
405 ///
406 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
407   MCInst TmpInst;
408   bool isPPC64 = Subtarget.isPPC64();
409   bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
410   const Module *M = MF->getFunction()->getParent();
411   PICLevel::Level PL = M->getPICLevel();
412 
413   // Lower multi-instruction pseudo operations.
414   switch (MI->getOpcode()) {
415   default: break;
416   case TargetOpcode::DBG_VALUE:
417     llvm_unreachable("Should be handled target independently");
418   case TargetOpcode::STACKMAP:
419     return LowerSTACKMAP(OutStreamer, SM, *MI);
420   case TargetOpcode::PATCHPOINT:
421     return LowerPATCHPOINT(OutStreamer, SM, *MI);
422 
423   case PPC::MoveGOTtoLR: {
424     // Transform %LR = MoveGOTtoLR
425     // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
426     // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
427     // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
428     //      blrl
429     // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
430     MCSymbol *GOTSymbol =
431       OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
432     const MCExpr *OffsExpr =
433       MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
434                                                       MCSymbolRefExpr::VK_PPC_LOCAL,
435                                                       OutContext),
436                               MCConstantExpr::Create(4, OutContext),
437                               OutContext);
438 
439     // Emit the 'bl'.
440     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
441     return;
442   }
443   case PPC::MovePCtoLR:
444   case PPC::MovePCtoLR8: {
445     // Transform %LR = MovePCtoLR
446     // Into this, where the label is the PIC base:
447     //     bl L1$pb
448     // L1$pb:
449     MCSymbol *PICBase = MF->getPICBaseSymbol();
450 
451     // Emit the 'bl'.
452     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
453       // FIXME: We would like an efficient form for this, so we don't have to do
454       // a lot of extra uniquing.
455       .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
456 
457     // Emit the label.
458     OutStreamer.EmitLabel(PICBase);
459     return;
460   }
461   case PPC::UpdateGBR: {
462     // Transform %Rd = UpdateGBR(%Rt, %Ri)
463     // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
464     //       add %Rd, %Rt, %Ri
465     // Get the offset from the GOT Base Register to the GOT
466     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
467     MCSymbol *PICOffset =
468       MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
469     TmpInst.setOpcode(PPC::LWZ);
470     const MCExpr *Exp =
471       MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
472     const MCExpr *PB =
473       MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
474                               MCSymbolRefExpr::VK_None,
475                               OutContext);
476     const MCOperand TR = TmpInst.getOperand(1);
477     const MCOperand PICR = TmpInst.getOperand(0);
478 
479     // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
480     TmpInst.getOperand(1) =
481         MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
482     TmpInst.getOperand(0) = TR;
483     TmpInst.getOperand(2) = PICR;
484     EmitToStreamer(OutStreamer, TmpInst);
485 
486     TmpInst.setOpcode(PPC::ADD4);
487     TmpInst.getOperand(0) = PICR;
488     TmpInst.getOperand(1) = TR;
489     TmpInst.getOperand(2) = PICR;
490     EmitToStreamer(OutStreamer, TmpInst);
491     return;
492   }
493   case PPC::LWZtoc: {
494     // Transform %R3 = LWZtoc <ga:@min1>, %R2
495     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
496 
497     // Change the opcode to LWZ, and the global address operand to be a
498     // reference to the GOT entry we will synthesize later.
499     TmpInst.setOpcode(PPC::LWZ);
500     const MachineOperand &MO = MI->getOperand(1);
501 
502     // Map symbol -> label of TOC entry
503     assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
504     MCSymbol *MOSymbol = nullptr;
505     if (MO.isGlobal())
506       MOSymbol = getSymbol(MO.getGlobal());
507     else if (MO.isCPI())
508       MOSymbol = GetCPISymbol(MO.getIndex());
509     else if (MO.isJTI())
510       MOSymbol = GetJTISymbol(MO.getIndex());
511     else if (MO.isBlockAddress())
512       MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
513 
514     if (PL == PICLevel::Small) {
515       const MCExpr *Exp =
516         MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
517                                 OutContext);
518       TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
519     } else {
520       MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
521 
522       const MCExpr *Exp =
523         MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
524                                 OutContext);
525       const MCExpr *PB =
526         MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
527                                                              OutContext);
528       Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
529       TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
530     }
531     EmitToStreamer(OutStreamer, TmpInst);
532     return;
533   }
534   case PPC::LDtocJTI:
535   case PPC::LDtocCPT:
536   case PPC::LDtocBA:
537   case PPC::LDtoc: {
538     // Transform %X3 = LDtoc <ga:@min1>, %X2
539     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
540 
541     // Change the opcode to LD, and the global address operand to be a
542     // reference to the TOC entry we will synthesize later.
543     TmpInst.setOpcode(PPC::LD);
544     const MachineOperand &MO = MI->getOperand(1);
545 
546     // Map symbol -> label of TOC entry
547     assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
548     MCSymbol *MOSymbol = nullptr;
549     if (MO.isGlobal())
550       MOSymbol = getSymbol(MO.getGlobal());
551     else if (MO.isCPI())
552       MOSymbol = GetCPISymbol(MO.getIndex());
553     else if (MO.isJTI())
554       MOSymbol = GetJTISymbol(MO.getIndex());
555     else if (MO.isBlockAddress())
556       MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
557 
558     MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
559 
560     const MCExpr *Exp =
561       MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
562                               OutContext);
563     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
564     EmitToStreamer(OutStreamer, TmpInst);
565     return;
566   }
567 
568   case PPC::ADDIStocHA: {
569     // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
570     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
571 
572     // Change the opcode to ADDIS8.  If the global address is external, has
573     // common linkage, is a non-local function address, or is a jump table
574     // address, then generate a TOC entry and reference that.  Otherwise
575     // reference the symbol directly.
576     TmpInst.setOpcode(PPC::ADDIS8);
577     const MachineOperand &MO = MI->getOperand(2);
578     assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
579             MO.isBlockAddress()) &&
580            "Invalid operand for ADDIStocHA!");
581     MCSymbol *MOSymbol = nullptr;
582     bool IsExternal = false;
583     bool IsNonLocalFunction = false;
584     bool IsCommon = false;
585     bool IsAvailExt = false;
586 
587     if (MO.isGlobal()) {
588       const GlobalValue *GV = MO.getGlobal();
589       MOSymbol = getSymbol(GV);
590       IsExternal = GV->isDeclaration();
591       IsCommon = GV->hasCommonLinkage();
592       IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
593         (GV->isDeclaration() || GV->isWeakForLinker());
594       IsAvailExt = GV->hasAvailableExternallyLinkage();
595     } else if (MO.isCPI())
596       MOSymbol = GetCPISymbol(MO.getIndex());
597     else if (MO.isJTI())
598       MOSymbol = GetJTISymbol(MO.getIndex());
599     else if (MO.isBlockAddress())
600       MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
601 
602     if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
603         MO.isJTI() || MO.isBlockAddress() ||
604         TM.getCodeModel() == CodeModel::Large)
605       MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
606 
607     const MCExpr *Exp =
608       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
609                               OutContext);
610     TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
611     EmitToStreamer(OutStreamer, TmpInst);
612     return;
613   }
614   case PPC::LDtocL: {
615     // Transform %Xd = LDtocL <ga:@sym>, %Xs
616     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
617 
618     // Change the opcode to LD.  If the global address is external, has
619     // common linkage, or is a jump table address, then reference the
620     // associated TOC entry.  Otherwise reference the symbol directly.
621     TmpInst.setOpcode(PPC::LD);
622     const MachineOperand &MO = MI->getOperand(1);
623     assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
624             MO.isBlockAddress()) &&
625            "Invalid operand for LDtocL!");
626     MCSymbol *MOSymbol = nullptr;
627 
628     if (MO.isJTI())
629       MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
630     else if (MO.isBlockAddress()) {
631       MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
632       MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
633     }
634     else if (MO.isCPI()) {
635       MOSymbol = GetCPISymbol(MO.getIndex());
636       if (TM.getCodeModel() == CodeModel::Large)
637         MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
638     }
639     else if (MO.isGlobal()) {
640       const GlobalValue *GValue = MO.getGlobal();
641       MOSymbol = getSymbol(GValue);
642       if (GValue->getType()->getElementType()->isFunctionTy() ||
643           GValue->isDeclaration() || GValue->hasCommonLinkage() ||
644           GValue->hasAvailableExternallyLinkage() ||
645           TM.getCodeModel() == CodeModel::Large)
646         MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
647     }
648 
649     const MCExpr *Exp =
650       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
651                               OutContext);
652     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
653     EmitToStreamer(OutStreamer, TmpInst);
654     return;
655   }
656   case PPC::ADDItocL: {
657     // Transform %Xd = ADDItocL %Xs, <ga:@sym>
658     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
659 
660     // Change the opcode to ADDI8.  If the global address is external, then
661     // generate a TOC entry and reference that.  Otherwise reference the
662     // symbol directly.
663     TmpInst.setOpcode(PPC::ADDI8);
664     const MachineOperand &MO = MI->getOperand(2);
665     assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
666     MCSymbol *MOSymbol = nullptr;
667     bool IsExternal = false;
668     bool IsNonLocalFunction = false;
669 
670     if (MO.isGlobal()) {
671       const GlobalValue *GV = MO.getGlobal();
672       MOSymbol = getSymbol(GV);
673       IsExternal = GV->isDeclaration();
674       IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
675         (GV->isDeclaration() || GV->isWeakForLinker());
676     } else if (MO.isCPI())
677       MOSymbol = GetCPISymbol(MO.getIndex());
678 
679     if (IsNonLocalFunction || IsExternal ||
680         TM.getCodeModel() == CodeModel::Large)
681       MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
682 
683     const MCExpr *Exp =
684       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
685                               OutContext);
686     TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
687     EmitToStreamer(OutStreamer, TmpInst);
688     return;
689   }
690   case PPC::ADDISgotTprelHA: {
691     // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
692     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
693     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
694     const MachineOperand &MO = MI->getOperand(2);
695     const GlobalValue *GValue = MO.getGlobal();
696     MCSymbol *MOSymbol = getSymbol(GValue);
697     const MCExpr *SymGotTprel =
698       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
699                               OutContext);
700     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
701                                 .addReg(MI->getOperand(0).getReg())
702                                 .addReg(PPC::X2)
703                                 .addExpr(SymGotTprel));
704     return;
705   }
706   case PPC::LDgotTprelL:
707   case PPC::LDgotTprelL32: {
708     // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
709     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
710 
711     // Change the opcode to LD.
712     TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
713     const MachineOperand &MO = MI->getOperand(1);
714     const GlobalValue *GValue = MO.getGlobal();
715     MCSymbol *MOSymbol = getSymbol(GValue);
716     const MCExpr *Exp =
717       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
718                               OutContext);
719     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
720     EmitToStreamer(OutStreamer, TmpInst);
721     return;
722   }
723 
724   case PPC::PPC32PICGOT: {
725     MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
726     MCSymbol *GOTRef = OutContext.CreateTempSymbol();
727     MCSymbol *NextInstr = OutContext.CreateTempSymbol();
728 
729     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
730       // FIXME: We would like an efficient form for this, so we don't have to do
731       // a lot of extra uniquing.
732       .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
733     const MCExpr *OffsExpr =
734       MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
735                                 MCSymbolRefExpr::Create(GOTRef, OutContext),
736         OutContext);
737     OutStreamer.EmitLabel(GOTRef);
738     OutStreamer.EmitValue(OffsExpr, 4);
739     OutStreamer.EmitLabel(NextInstr);
740     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
741                                 .addReg(MI->getOperand(0).getReg()));
742     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
743                                 .addReg(MI->getOperand(1).getReg())
744                                 .addImm(0)
745                                 .addReg(MI->getOperand(0).getReg()));
746     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
747                                 .addReg(MI->getOperand(0).getReg())
748                                 .addReg(MI->getOperand(1).getReg())
749                                 .addReg(MI->getOperand(0).getReg()));
750     return;
751   }
752   case PPC::PPC32GOT: {
753     MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
754     const MCExpr *SymGotTlsL =
755       MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
756                               OutContext);
757     const MCExpr *SymGotTlsHA =
758       MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
759                               OutContext);
760     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
761                                 .addReg(MI->getOperand(0).getReg())
762                                 .addExpr(SymGotTlsL));
763     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
764                                 .addReg(MI->getOperand(0).getReg())
765                                 .addReg(MI->getOperand(0).getReg())
766                                 .addExpr(SymGotTlsHA));
767     return;
768   }
769   case PPC::ADDIStlsgdHA: {
770     // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
771     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
772     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
773     const MachineOperand &MO = MI->getOperand(2);
774     const GlobalValue *GValue = MO.getGlobal();
775     MCSymbol *MOSymbol = getSymbol(GValue);
776     const MCExpr *SymGotTlsGD =
777       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
778                               OutContext);
779     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
780                                 .addReg(MI->getOperand(0).getReg())
781                                 .addReg(PPC::X2)
782                                 .addExpr(SymGotTlsGD));
783     return;
784   }
785   case PPC::ADDItlsgdL:
786     // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
787     // Into:      %Xd = ADDI8 %Xs, sym@got@tlsgd@l
788   case PPC::ADDItlsgdL32: {
789     // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
790     // Into:      %Rd = ADDI %Rs, sym@got@tlsgd
791     const MachineOperand &MO = MI->getOperand(2);
792     const GlobalValue *GValue = MO.getGlobal();
793     MCSymbol *MOSymbol = getSymbol(GValue);
794     const MCExpr *SymGotTlsGD =
795       MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
796                                          MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
797                                          MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
798                               OutContext);
799     EmitToStreamer(OutStreamer,
800                    MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
801                    .addReg(MI->getOperand(0).getReg())
802                    .addReg(MI->getOperand(1).getReg())
803                    .addExpr(SymGotTlsGD));
804     return;
805   }
806   case PPC::ADDIStlsldHA: {
807     // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
808     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
809     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
810     const MachineOperand &MO = MI->getOperand(2);
811     const GlobalValue *GValue = MO.getGlobal();
812     MCSymbol *MOSymbol = getSymbol(GValue);
813     const MCExpr *SymGotTlsLD =
814       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
815                               OutContext);
816     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
817                                 .addReg(MI->getOperand(0).getReg())
818                                 .addReg(PPC::X2)
819                                 .addExpr(SymGotTlsLD));
820     return;
821   }
822   case PPC::ADDItlsldL:
823     // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
824     // Into:      %Xd = ADDI8 %Xs, sym@got@tlsld@l
825   case PPC::ADDItlsldL32: {
826     // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
827     // Into:      %Rd = ADDI %Rs, sym@got@tlsld
828     const MachineOperand &MO = MI->getOperand(2);
829     const GlobalValue *GValue = MO.getGlobal();
830     MCSymbol *MOSymbol = getSymbol(GValue);
831     const MCExpr *SymGotTlsLD =
832       MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
833                                          MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
834                                          MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
835                               OutContext);
836     EmitToStreamer(OutStreamer,
837                    MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
838                    .addReg(MI->getOperand(0).getReg())
839                    .addReg(MI->getOperand(1).getReg())
840                    .addExpr(SymGotTlsLD));
841     return;
842   }
843   case PPC::ADDISdtprelHA:
844     // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
845     // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
846   case PPC::ADDISdtprelHA32: {
847     // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
848     // Into:      %Rd = ADDIS %R3, sym@dtprel@ha
849     const MachineOperand &MO = MI->getOperand(2);
850     const GlobalValue *GValue = MO.getGlobal();
851     MCSymbol *MOSymbol = getSymbol(GValue);
852     const MCExpr *SymDtprel =
853       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
854                               OutContext);
855     EmitToStreamer(OutStreamer,
856                    MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
857                    .addReg(MI->getOperand(0).getReg())
858                    .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
859                    .addExpr(SymDtprel));
860     return;
861   }
862   case PPC::ADDIdtprelL:
863     // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
864     // Into:      %Xd = ADDI8 %Xs, sym@dtprel@l
865   case PPC::ADDIdtprelL32: {
866     // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
867     // Into:      %Rd = ADDI %Rs, sym@dtprel@l
868     const MachineOperand &MO = MI->getOperand(2);
869     const GlobalValue *GValue = MO.getGlobal();
870     MCSymbol *MOSymbol = getSymbol(GValue);
871     const MCExpr *SymDtprel =
872       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
873                               OutContext);
874     EmitToStreamer(OutStreamer,
875                    MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
876                    .addReg(MI->getOperand(0).getReg())
877                    .addReg(MI->getOperand(1).getReg())
878                    .addExpr(SymDtprel));
879     return;
880   }
881   case PPC::MFOCRF:
882   case PPC::MFOCRF8:
883     if (!Subtarget.hasMFOCRF()) {
884       // Transform: %R3 = MFOCRF %CR7
885       // Into:      %R3 = MFCR   ;; cr7
886       unsigned NewOpcode =
887         MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
888       OutStreamer.AddComment(PPCInstPrinter::
889                              getRegisterName(MI->getOperand(1).getReg()));
890       EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
891                                   .addReg(MI->getOperand(0).getReg()));
892       return;
893     }
894     break;
895   case PPC::MTOCRF:
896   case PPC::MTOCRF8:
897     if (!Subtarget.hasMFOCRF()) {
898       // Transform: %CR7 = MTOCRF %R3
899       // Into:      MTCRF mask, %R3 ;; cr7
900       unsigned NewOpcode =
901         MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
902       unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
903                               ->getEncodingValue(MI->getOperand(0).getReg());
904       OutStreamer.AddComment(PPCInstPrinter::
905                              getRegisterName(MI->getOperand(0).getReg()));
906       EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
907                                   .addImm(Mask)
908                                   .addReg(MI->getOperand(1).getReg()));
909       return;
910     }
911     break;
912   case PPC::LD:
913   case PPC::STD:
914   case PPC::LWA_32:
915   case PPC::LWA: {
916     // Verify alignment is legal, so we don't create relocations
917     // that can't be supported.
918     // FIXME:  This test is currently disabled for Darwin.  The test
919     // suite shows a handful of test cases that fail this check for
920     // Darwin.  Those need to be investigated before this sanity test
921     // can be enabled for those subtargets.
922     if (!Subtarget.isDarwin()) {
923       unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
924       const MachineOperand &MO = MI->getOperand(OpNum);
925       if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
926         llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
927     }
928     // Now process the instruction normally.
929     break;
930   }
931   }
932 
933   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
934   EmitToStreamer(OutStreamer, TmpInst);
935 }
936 
937 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
938   if (Subtarget.isELFv2ABI()) {
939     PPCTargetStreamer *TS =
940       static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
941 
942     if (TS)
943       TS->emitAbiVersion(2);
944   }
945 
946   if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
947     return AsmPrinter::EmitStartOfAsmFile(M);
948 
949   if (M.getPICLevel() == PICLevel::Small)
950     return AsmPrinter::EmitStartOfAsmFile(M);
951 
952   OutStreamer.SwitchSection(OutContext.getELFSection(".got2",
953          ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
954          SectionKind::getReadOnly()));
955 
956   MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
957   MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
958 
959   OutStreamer.EmitLabel(CurrentPos);
960 
961   // The GOT pointer points to the middle of the GOT, in order to reference the
962   // entire 64kB range.  0x8000 is the midpoint.
963   const MCExpr *tocExpr =
964     MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
965                             MCConstantExpr::Create(0x8000, OutContext),
966                             OutContext);
967 
968   OutStreamer.EmitAssignment(TOCSym, tocExpr);
969 
970   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
971 }
972 
973 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
974   // linux/ppc32 - Normal entry label.
975   if (!Subtarget.isPPC64() &&
976       (TM.getRelocationModel() != Reloc::PIC_ ||
977        MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
978     return AsmPrinter::EmitFunctionEntryLabel();
979 
980   if (!Subtarget.isPPC64()) {
981     const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
982   	if (PPCFI->usesPICBase()) {
983       MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
984       MCSymbol *PICBase = MF->getPICBaseSymbol();
985       OutStreamer.EmitLabel(RelocSymbol);
986 
987       const MCExpr *OffsExpr =
988         MCBinaryExpr::CreateSub(
989           MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
990                                                                OutContext),
991                                   MCSymbolRefExpr::Create(PICBase, OutContext),
992           OutContext);
993       OutStreamer.EmitValue(OffsExpr, 4);
994       OutStreamer.EmitLabel(CurrentFnSym);
995       return;
996     } else
997       return AsmPrinter::EmitFunctionEntryLabel();
998   }
999 
1000   // ELFv2 ABI - Normal entry label.
1001   if (Subtarget.isELFv2ABI())
1002     return AsmPrinter::EmitFunctionEntryLabel();
1003 
1004   // Emit an official procedure descriptor.
1005   MCSectionSubPair Current = OutStreamer.getCurrentSection();
1006   const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
1007       ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1008       SectionKind::getReadOnly());
1009   OutStreamer.SwitchSection(Section);
1010   OutStreamer.EmitLabel(CurrentFnSym);
1011   OutStreamer.EmitValueToAlignment(8);
1012   MCSymbol *Symbol1 =
1013     OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
1014   // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1015   // entry point.
1016   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1017 			8 /*size*/);
1018   MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1019   // Generates a R_PPC64_TOC relocation for TOC base insertion.
1020   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1021                         MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1022                         8/*size*/);
1023   // Emit a null environment pointer.
1024   OutStreamer.EmitIntValue(0, 8 /* size */);
1025   OutStreamer.SwitchSection(Current.first, Current.second);
1026 
1027   MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1028                           ".L." + Twine(CurrentFnSym->getName()));
1029   OutStreamer.EmitLabel(RealFnSym);
1030   CurrentFnSymForSize = RealFnSym;
1031 }
1032 
1033 
1034 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1035   const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
1036 
1037   bool isPPC64 = TD->getPointerSizeInBits() == 64;
1038 
1039   PPCTargetStreamer &TS =
1040       static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1041 
1042   if (!TOC.empty()) {
1043     const MCSectionELF *Section;
1044 
1045     if (isPPC64)
1046       Section = OutStreamer.getContext().getELFSection(".toc",
1047         ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1048         SectionKind::getReadOnly());
1049 	else
1050       Section = OutStreamer.getContext().getELFSection(".got2",
1051         ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1052         SectionKind::getReadOnly());
1053     OutStreamer.SwitchSection(Section);
1054 
1055     for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1056          E = TOC.end(); I != E; ++I) {
1057       OutStreamer.EmitLabel(I->second);
1058       MCSymbol *S = I->first;
1059       if (isPPC64)
1060         TS.emitTCEntry(*S);
1061       else
1062         OutStreamer.EmitSymbolValue(S, 4);
1063     }
1064   }
1065 
1066   MachineModuleInfoELF &MMIELF =
1067     MMI->getObjFileInfo<MachineModuleInfoELF>();
1068 
1069   MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1070   if (!Stubs.empty()) {
1071     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1072     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1073       // L_foo$stub:
1074       OutStreamer.EmitLabel(Stubs[i].first);
1075       //   .long _foo
1076       OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1077                                                     OutContext),
1078                             isPPC64 ? 8 : 4/*size*/);
1079     }
1080 
1081     Stubs.clear();
1082     OutStreamer.AddBlankLine();
1083   }
1084 
1085   return AsmPrinter::doFinalization(M);
1086 }
1087 
1088 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1089 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1090   // In the ELFv2 ABI, in functions that use the TOC register, we need to
1091   // provide two entry points.  The ABI guarantees that when calling the
1092   // local entry point, r2 is set up by the caller to contain the TOC base
1093   // for this function, and when calling the global entry point, r12 is set
1094   // up by the caller to hold the address of the global entry point.  We
1095   // thus emit a prefix sequence along the following lines:
1096   //
1097   // func:
1098   //         # global entry point
1099   //         addis r2,r12,(.TOC.-func)@ha
1100   //         addi  r2,r2,(.TOC.-func)@l
1101   //         .localentry func, .-func
1102   //         # local entry point, followed by function body
1103   //
1104   // This ensures we have r2 set up correctly while executing the function
1105   // body, no matter which entry point is called.
1106   if (Subtarget.isELFv2ABI()
1107       // Only do all that if the function uses r2 in the first place.
1108       && !MF->getRegInfo().use_empty(PPC::X2)) {
1109 
1110     MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1111     OutStreamer.EmitLabel(GlobalEntryLabel);
1112     const MCSymbolRefExpr *GlobalEntryLabelExp =
1113       MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1114 
1115     MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1116     const MCExpr *TOCDeltaExpr =
1117       MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1118                               GlobalEntryLabelExp, OutContext);
1119 
1120     const MCExpr *TOCDeltaHi =
1121       PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1122     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1123                                 .addReg(PPC::X2)
1124                                 .addReg(PPC::X12)
1125                                 .addExpr(TOCDeltaHi));
1126 
1127     const MCExpr *TOCDeltaLo =
1128       PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1129     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1130                                 .addReg(PPC::X2)
1131                                 .addReg(PPC::X2)
1132                                 .addExpr(TOCDeltaLo));
1133 
1134     MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1135     OutStreamer.EmitLabel(LocalEntryLabel);
1136     const MCSymbolRefExpr *LocalEntryLabelExp =
1137        MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1138     const MCExpr *LocalOffsetExp =
1139       MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1140                               GlobalEntryLabelExp, OutContext);
1141 
1142     PPCTargetStreamer *TS =
1143       static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1144 
1145     if (TS)
1146       TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1147   }
1148 }
1149 
1150 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1151 /// directive.
1152 ///
1153 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1154   // Only the 64-bit target requires a traceback table.  For now,
1155   // we only emit the word of zeroes that GDB requires to find
1156   // the end of the function, and zeroes for the eight-byte
1157   // mandatory fields.
1158   // FIXME: We should fill in the eight-byte mandatory fields as described in
1159   // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1160   // currently make use of these fields).
1161   if (Subtarget.isPPC64()) {
1162     OutStreamer.EmitIntValue(0, 4/*size*/);
1163     OutStreamer.EmitIntValue(0, 8/*size*/);
1164   }
1165 }
1166 
1167 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1168   static const char *const CPUDirectives[] = {
1169     "",
1170     "ppc",
1171     "ppc440",
1172     "ppc601",
1173     "ppc602",
1174     "ppc603",
1175     "ppc7400",
1176     "ppc750",
1177     "ppc970",
1178     "ppcA2",
1179     "ppce500mc",
1180     "ppce5500",
1181     "power3",
1182     "power4",
1183     "power5",
1184     "power5x",
1185     "power6",
1186     "power6x",
1187     "power7",
1188     "ppc64",
1189     "ppc64le"
1190   };
1191 
1192   unsigned Directive = Subtarget.getDarwinDirective();
1193   if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1194     Directive = PPC::DIR_970;
1195   if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1196     Directive = PPC::DIR_7400;
1197   if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1198     Directive = PPC::DIR_64;
1199   assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1200 
1201   assert(Directive < array_lengthof(CPUDirectives) &&
1202          "CPUDirectives[] might not be up-to-date!");
1203   PPCTargetStreamer &TStreamer =
1204       *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1205   TStreamer.emitMachine(CPUDirectives[Directive]);
1206 
1207   // Prime text sections so they are adjacent.  This reduces the likelihood a
1208   // large data or debug section causes a branch to exceed 16M limit.
1209   const TargetLoweringObjectFileMachO &TLOFMacho =
1210     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1211   OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1212   if (TM.getRelocationModel() == Reloc::PIC_) {
1213     OutStreamer.SwitchSection(
1214            OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1215                                       MachO::S_SYMBOL_STUBS |
1216                                       MachO::S_ATTR_PURE_INSTRUCTIONS,
1217                                       32, SectionKind::getText()));
1218   } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1219     OutStreamer.SwitchSection(
1220            OutContext.getMachOSection("__TEXT","__symbol_stub1",
1221                                       MachO::S_SYMBOL_STUBS |
1222                                       MachO::S_ATTR_PURE_INSTRUCTIONS,
1223                                       16, SectionKind::getText()));
1224   }
1225   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1226 }
1227 
1228 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1229   // Remove $stub suffix, add $lazy_ptr.
1230   StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1231   return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1232 }
1233 
1234 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1235   // Add $tmp suffix to $stub, yielding $stub$tmp.
1236   return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1237 }
1238 
1239 void PPCDarwinAsmPrinter::
1240 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1241   bool isPPC64 =
1242       TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1243   bool isDarwin = Subtarget.isDarwin();
1244 
1245   const TargetLoweringObjectFileMachO &TLOFMacho =
1246     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1247 
1248   // .lazy_symbol_pointer
1249   const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1250 
1251   // Output stubs for dynamically-linked functions
1252   if (TM.getRelocationModel() == Reloc::PIC_) {
1253     const MCSection *StubSection =
1254     OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1255                                MachO::S_SYMBOL_STUBS |
1256                                MachO::S_ATTR_PURE_INSTRUCTIONS,
1257                                32, SectionKind::getText());
1258     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1259       OutStreamer.SwitchSection(StubSection);
1260       EmitAlignment(4);
1261 
1262       MCSymbol *Stub = Stubs[i].first;
1263       MCSymbol *RawSym = Stubs[i].second.getPointer();
1264       MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1265       MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1266 
1267       OutStreamer.EmitLabel(Stub);
1268       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1269 
1270       const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1271       const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1272       const MCExpr *Sub =
1273         MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1274 
1275       // mflr r0
1276       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1277       // bcl 20, 31, AnonSymbol
1278       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1279       OutStreamer.EmitLabel(AnonSymbol);
1280       // mflr r11
1281       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1282       // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1283       const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1284       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1285         .addReg(PPC::R11)
1286         .addReg(PPC::R11)
1287         .addExpr(SubHa16));
1288       // mtlr r0
1289       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1290 
1291       // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1292       // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1293       const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1294       EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1295         .addReg(PPC::R12)
1296         .addExpr(SubLo16).addExpr(SubLo16)
1297         .addReg(PPC::R11));
1298       // mtctr r12
1299       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1300       // bctr
1301       EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1302 
1303       OutStreamer.SwitchSection(LSPSection);
1304       OutStreamer.EmitLabel(LazyPtr);
1305       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1306 
1307       MCSymbol *DyldStubBindingHelper =
1308         OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1309       if (isPPC64) {
1310         // .quad dyld_stub_binding_helper
1311         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1312       } else {
1313         // .long dyld_stub_binding_helper
1314         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1315       }
1316     }
1317     OutStreamer.AddBlankLine();
1318     return;
1319   }
1320 
1321   const MCSection *StubSection =
1322     OutContext.getMachOSection("__TEXT","__symbol_stub1",
1323                                MachO::S_SYMBOL_STUBS |
1324                                MachO::S_ATTR_PURE_INSTRUCTIONS,
1325                                16, SectionKind::getText());
1326   for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1327     MCSymbol *Stub = Stubs[i].first;
1328     MCSymbol *RawSym = Stubs[i].second.getPointer();
1329     MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1330     const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1331 
1332     OutStreamer.SwitchSection(StubSection);
1333     EmitAlignment(4);
1334     OutStreamer.EmitLabel(Stub);
1335     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1336 
1337     // lis r11, ha16(LazyPtr)
1338     const MCExpr *LazyPtrHa16 =
1339       PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1340     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1341       .addReg(PPC::R11)
1342       .addExpr(LazyPtrHa16));
1343 
1344     // ldu r12, lo16(LazyPtr)(r11)
1345     // lwzu r12, lo16(LazyPtr)(r11)
1346     const MCExpr *LazyPtrLo16 =
1347       PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1348     EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1349       .addReg(PPC::R12)
1350       .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1351       .addReg(PPC::R11));
1352 
1353     // mtctr r12
1354     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1355     // bctr
1356     EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1357 
1358     OutStreamer.SwitchSection(LSPSection);
1359     OutStreamer.EmitLabel(LazyPtr);
1360     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1361 
1362     MCSymbol *DyldStubBindingHelper =
1363       OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1364     if (isPPC64) {
1365       // .quad dyld_stub_binding_helper
1366       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1367     } else {
1368       // .long dyld_stub_binding_helper
1369       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1370     }
1371   }
1372 
1373   OutStreamer.AddBlankLine();
1374 }
1375 
1376 
1377 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1378   bool isPPC64 =
1379       TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1380 
1381   // Darwin/PPC always uses mach-o.
1382   const TargetLoweringObjectFileMachO &TLOFMacho =
1383     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1384   MachineModuleInfoMachO &MMIMacho =
1385     MMI->getObjFileInfo<MachineModuleInfoMachO>();
1386 
1387   MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1388   if (!Stubs.empty())
1389     EmitFunctionStubs(Stubs);
1390 
1391   if (MAI->doesSupportExceptionHandling() && MMI) {
1392     // Add the (possibly multiple) personalities to the set of global values.
1393     // Only referenced functions get into the Personalities list.
1394     const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1395     for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1396          E = Personalities.end(); I != E; ++I) {
1397       if (*I) {
1398         MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1399         MachineModuleInfoImpl::StubValueTy &StubSym =
1400           MMIMacho.getGVStubEntry(NLPSym);
1401         StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1402       }
1403     }
1404   }
1405 
1406   // Output stubs for dynamically-linked functions.
1407   Stubs = MMIMacho.GetGVStubList();
1408 
1409   // Output macho stubs for external and common global variables.
1410   if (!Stubs.empty()) {
1411     // Switch with ".non_lazy_symbol_pointer" directive.
1412     OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1413     EmitAlignment(isPPC64 ? 3 : 2);
1414 
1415     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1416       // L_foo$stub:
1417       OutStreamer.EmitLabel(Stubs[i].first);
1418       //   .indirect_symbol _foo
1419       MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1420       OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1421 
1422       if (MCSym.getInt())
1423         // External to current translation unit.
1424         OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1425       else
1426         // Internal to current translation unit.
1427         //
1428         // When we place the LSDA into the TEXT section, the type info pointers
1429         // need to be indirect and pc-rel. We accomplish this by using NLPs.
1430         // However, sometimes the types are local to the file. So we need to
1431         // fill in the value for the NLP in those cases.
1432         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1433                                                       OutContext),
1434                               isPPC64 ? 8 : 4/*size*/);
1435     }
1436 
1437     Stubs.clear();
1438     OutStreamer.AddBlankLine();
1439   }
1440 
1441   Stubs = MMIMacho.GetHiddenGVStubList();
1442   if (!Stubs.empty()) {
1443     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1444     EmitAlignment(isPPC64 ? 3 : 2);
1445 
1446     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1447       // L_foo$stub:
1448       OutStreamer.EmitLabel(Stubs[i].first);
1449       //   .long _foo
1450       OutStreamer.EmitValue(MCSymbolRefExpr::
1451                             Create(Stubs[i].second.getPointer(),
1452                                    OutContext),
1453                             isPPC64 ? 8 : 4/*size*/);
1454     }
1455 
1456     Stubs.clear();
1457     OutStreamer.AddBlankLine();
1458   }
1459 
1460   // Funny Darwin hack: This flag tells the linker that no global symbols
1461   // contain code that falls through to other global symbols (e.g. the obvious
1462   // implementation of multiple entry points).  If this doesn't occur, the
1463   // linker can safely perform dead code stripping.  Since LLVM never generates
1464   // code that does this, it is always safe to set.
1465   OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1466 
1467   return AsmPrinter::doFinalization(M);
1468 }
1469 
1470 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1471 /// for a MachineFunction to the given output stream, in a format that the
1472 /// Darwin assembler can deal with.
1473 ///
1474 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1475                                            MCStreamer &Streamer) {
1476   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1477 
1478   if (Subtarget->isDarwin())
1479     return new PPCDarwinAsmPrinter(tm, Streamer);
1480   return new PPCLinuxAsmPrinter(tm, Streamer);
1481 }
1482 
1483 // Force static initialization.
1484 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1485   TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1486   TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1487   TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);
1488 }
1489