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 "PPCSubtarget.h"
24 #include "PPCTargetMachine.h"
25 #include "llvm/ADT/MapVector.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/ADT/StringExtras.h"
28 #include "llvm/Assembly/Writer.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/MachineFunctionPass.h"
31 #include "llvm/CodeGen/MachineInstr.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
34 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
35 #include "llvm/DebugInfo.h"
36 #include "llvm/IR/Constants.h"
37 #include "llvm/IR/DerivedTypes.h"
38 #include "llvm/IR/Module.h"
39 #include "llvm/MC/MCAsmInfo.h"
40 #include "llvm/MC/MCContext.h"
41 #include "llvm/MC/MCExpr.h"
42 #include "llvm/MC/MCInst.h"
43 #include "llvm/MC/MCInstBuilder.h"
44 #include "llvm/MC/MCSectionELF.h"
45 #include "llvm/MC/MCSectionMachO.h"
46 #include "llvm/MC/MCStreamer.h"
47 #include "llvm/MC/MCSymbol.h"
48 #include "llvm/Support/CommandLine.h"
49 #include "llvm/Support/Debug.h"
50 #include "llvm/Support/ELF.h"
51 #include "llvm/Support/ErrorHandling.h"
52 #include "llvm/Support/MathExtras.h"
53 #include "llvm/Support/TargetRegistry.h"
54 #include "llvm/Support/raw_ostream.h"
55 #include "llvm/Target/Mangler.h"
56 #include "llvm/Target/TargetInstrInfo.h"
57 #include "llvm/Target/TargetOptions.h"
58 #include "llvm/Target/TargetRegisterInfo.h"
59 using namespace llvm;
60 
61 namespace {
62   class PPCAsmPrinter : public AsmPrinter {
63   protected:
64     MapVector<MCSymbol*, MCSymbol*> TOC;
65     const PPCSubtarget &Subtarget;
66     uint64_t TOCLabelID;
67   public:
68     explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
69       : AsmPrinter(TM, Streamer),
70         Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
71 
72     virtual const char *getPassName() const {
73       return "PowerPC Assembly Printer";
74     }
75 
76     MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
77 
78     virtual void EmitInstruction(const MachineInstr *MI);
79 
80     void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
81 
82     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
83                          unsigned AsmVariant, const char *ExtraCode,
84                          raw_ostream &O);
85     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
86                                unsigned AsmVariant, const char *ExtraCode,
87                                raw_ostream &O);
88 
89     MachineLocation getDebugValueLocation(const MachineInstr *MI) const {
90       MachineLocation Location;
91       assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
92       // Frame address.  Currently handles register +- offset only.
93       if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm())
94         Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm());
95       else {
96         DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
97       }
98       return Location;
99     }
100   };
101 
102   /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
103   class PPCLinuxAsmPrinter : public PPCAsmPrinter {
104   public:
105     explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
106       : PPCAsmPrinter(TM, Streamer) {}
107 
108     virtual const char *getPassName() const {
109       return "Linux PPC Assembly Printer";
110     }
111 
112     bool doFinalization(Module &M);
113 
114     virtual void EmitFunctionEntryLabel();
115 
116     void EmitFunctionBodyEnd();
117   };
118 
119   /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
120   /// OS X
121   class PPCDarwinAsmPrinter : public PPCAsmPrinter {
122   public:
123     explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
124       : PPCAsmPrinter(TM, Streamer) {}
125 
126     virtual const char *getPassName() const {
127       return "Darwin PPC Assembly Printer";
128     }
129 
130     bool doFinalization(Module &M);
131     void EmitStartOfAsmFile(Module &M);
132 
133     void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
134   };
135 } // end of anonymous namespace
136 
137 /// stripRegisterPrefix - This method strips the character prefix from a
138 /// register name so that only the number is left.  Used by for linux asm.
139 static const char *stripRegisterPrefix(const char *RegName) {
140   switch (RegName[0]) {
141     case 'r':
142     case 'f':
143     case 'v': return RegName + 1;
144     case 'c': if (RegName[1] == 'r') return RegName + 2;
145   }
146 
147   return RegName;
148 }
149 
150 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
151                                  raw_ostream &O) {
152   const MachineOperand &MO = MI->getOperand(OpNo);
153 
154   switch (MO.getType()) {
155   case MachineOperand::MO_Register: {
156     const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
157     // Linux assembler (Others?) does not take register mnemonics.
158     // FIXME - What about special registers used in mfspr/mtspr?
159     if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
160     O << RegName;
161     return;
162   }
163   case MachineOperand::MO_Immediate:
164     O << MO.getImm();
165     return;
166 
167   case MachineOperand::MO_MachineBasicBlock:
168     O << *MO.getMBB()->getSymbol();
169     return;
170   case MachineOperand::MO_JumpTableIndex:
171     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
172       << '_' << MO.getIndex();
173     // FIXME: PIC relocation model
174     return;
175   case MachineOperand::MO_ConstantPoolIndex:
176     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
177       << '_' << MO.getIndex();
178     return;
179   case MachineOperand::MO_BlockAddress:
180     O << *GetBlockAddressSymbol(MO.getBlockAddress());
181     return;
182   case MachineOperand::MO_ExternalSymbol: {
183     // Computing the address of an external symbol, not calling it.
184     if (TM.getRelocationModel() == Reloc::Static) {
185       O << *GetExternalSymbolSymbol(MO.getSymbolName());
186       return;
187     }
188 
189     MCSymbol *NLPSym =
190       OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
191                                    MO.getSymbolName()+"$non_lazy_ptr");
192     MachineModuleInfoImpl::StubValueTy &StubSym =
193       MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
194     if (StubSym.getPointer() == 0)
195       StubSym = MachineModuleInfoImpl::
196         StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
197 
198     O << *NLPSym;
199     return;
200   }
201   case MachineOperand::MO_GlobalAddress: {
202     // Computing the address of a global symbol, not calling it.
203     const GlobalValue *GV = MO.getGlobal();
204     MCSymbol *SymToPrint;
205 
206     // External or weakly linked global variables need non-lazily-resolved stubs
207     if (TM.getRelocationModel() != Reloc::Static &&
208         (GV->isDeclaration() || GV->isWeakForLinker())) {
209       if (!GV->hasHiddenVisibility()) {
210         SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
211         MachineModuleInfoImpl::StubValueTy &StubSym =
212           MMI->getObjFileInfo<MachineModuleInfoMachO>()
213             .getGVStubEntry(SymToPrint);
214         if (StubSym.getPointer() == 0)
215           StubSym = MachineModuleInfoImpl::
216             StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
217       } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
218                  GV->hasAvailableExternallyLinkage()) {
219         SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
220 
221         MachineModuleInfoImpl::StubValueTy &StubSym =
222           MMI->getObjFileInfo<MachineModuleInfoMachO>().
223                     getHiddenGVStubEntry(SymToPrint);
224         if (StubSym.getPointer() == 0)
225           StubSym = MachineModuleInfoImpl::
226             StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
227       } else {
228         SymToPrint = Mang->getSymbol(GV);
229       }
230     } else {
231       SymToPrint = Mang->getSymbol(GV);
232     }
233 
234     O << *SymToPrint;
235 
236     printOffset(MO.getOffset(), O);
237     return;
238   }
239 
240   default:
241     O << "<unknown operand type: " << MO.getType() << ">";
242     return;
243   }
244 }
245 
246 /// PrintAsmOperand - Print out an operand for an inline asm expression.
247 ///
248 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
249                                     unsigned AsmVariant,
250                                     const char *ExtraCode, raw_ostream &O) {
251   // Does this asm operand have a single letter operand modifier?
252   if (ExtraCode && ExtraCode[0]) {
253     if (ExtraCode[1] != 0) return true; // Unknown modifier.
254 
255     switch (ExtraCode[0]) {
256     default:
257       // See if this is a generic print operand
258       return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
259     case 'c': // Don't print "$" before a global var name or constant.
260       break; // PPC never has a prefix.
261     case 'L': // Write second word of DImode reference.
262       // Verify that this operand has two consecutive registers.
263       if (!MI->getOperand(OpNo).isReg() ||
264           OpNo+1 == MI->getNumOperands() ||
265           !MI->getOperand(OpNo+1).isReg())
266         return true;
267       ++OpNo;   // Return the high-part.
268       break;
269     case 'I':
270       // Write 'i' if an integer constant, otherwise nothing.  Used to print
271       // addi vs add, etc.
272       if (MI->getOperand(OpNo).isImm())
273         O << "i";
274       return false;
275     }
276   }
277 
278   printOperand(MI, OpNo, O);
279   return false;
280 }
281 
282 // At the moment, all inline asm memory operands are a single register.
283 // In any case, the output of this routine should always be just one
284 // assembler operand.
285 
286 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
287                                           unsigned AsmVariant,
288                                           const char *ExtraCode,
289                                           raw_ostream &O) {
290   if (ExtraCode && ExtraCode[0]) {
291     if (ExtraCode[1] != 0) return true; // Unknown modifier.
292 
293     switch (ExtraCode[0]) {
294     default: return true;  // Unknown modifier.
295     case 'y': // A memory reference for an X-form instruction
296       {
297         const char *RegName = "r0";
298         if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
299         O << RegName << ", ";
300         printOperand(MI, OpNo, O);
301         return false;
302       }
303     }
304   }
305 
306   assert(MI->getOperand(OpNo).isReg());
307   O << "0(";
308   printOperand(MI, OpNo, O);
309   O << ")";
310   return false;
311 }
312 
313 
314 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
315 /// exists for it.  If not, create one.  Then return a symbol that references
316 /// the TOC entry.
317 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
318 
319   MCSymbol *&TOCEntry = TOC[Sym];
320 
321   // To avoid name clash check if the name already exists.
322   while (TOCEntry == 0) {
323     if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
324                                 "C" + Twine(TOCLabelID++)) == 0) {
325       TOCEntry = GetTempSymbol("C", TOCLabelID);
326     }
327   }
328 
329   return TOCEntry;
330 }
331 
332 
333 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
334 /// the current output stream.
335 ///
336 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
337   MCInst TmpInst;
338 
339   // Lower multi-instruction pseudo operations.
340   switch (MI->getOpcode()) {
341   default: break;
342   case TargetOpcode::DBG_VALUE: {
343     if (!isVerbose() || !OutStreamer.hasRawTextSupport()) return;
344 
345     SmallString<32> Str;
346     raw_svector_ostream O(Str);
347     unsigned NOps = MI->getNumOperands();
348     assert(NOps==4);
349     O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
350     // cast away const; DIetc do not take const operands for some reason.
351     DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
352     O << V.getName();
353     O << " <- ";
354     // Frame address.  Currently handles register +- offset only.
355     assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
356     O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O);
357     O << ']';
358     O << "+";
359     printOperand(MI, NOps-2, O);
360     OutStreamer.EmitRawText(O.str());
361     return;
362   }
363 
364   case PPC::MovePCtoLR:
365   case PPC::MovePCtoLR8: {
366     // Transform %LR = MovePCtoLR
367     // Into this, where the label is the PIC base:
368     //     bl L1$pb
369     // L1$pb:
370     MCSymbol *PICBase = MF->getPICBaseSymbol();
371 
372     // Emit the 'bl'.
373     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL_Darwin) // Darwin vs SVR4 doesn't matter here.
374       // FIXME: We would like an efficient form for this, so we don't have to do
375       // a lot of extra uniquing.
376       .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
377 
378     // Emit the label.
379     OutStreamer.EmitLabel(PICBase);
380     return;
381   }
382   case PPC::LDtocJTI:
383   case PPC::LDtocCPT:
384   case PPC::LDtoc: {
385     // Transform %X3 = LDtoc <ga:@min1>, %X2
386     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
387 
388     // Change the opcode to LD, and the global address operand to be a
389     // reference to the TOC entry we will synthesize later.
390     TmpInst.setOpcode(PPC::LD);
391     const MachineOperand &MO = MI->getOperand(1);
392 
393     // Map symbol -> label of TOC entry
394     assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
395     MCSymbol *MOSymbol = 0;
396     if (MO.isGlobal())
397       MOSymbol = Mang->getSymbol(MO.getGlobal());
398     else if (MO.isCPI())
399       MOSymbol = GetCPISymbol(MO.getIndex());
400     else if (MO.isJTI())
401       MOSymbol = GetJTISymbol(MO.getIndex());
402 
403     MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
404 
405     const MCExpr *Exp =
406       MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC_ENTRY,
407                               OutContext);
408     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
409     OutStreamer.EmitInstruction(TmpInst);
410     return;
411   }
412 
413   case PPC::ADDIStocHA: {
414     // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
415     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
416 
417     // Change the opcode to ADDIS8.  If the global address is external,
418     // has common linkage, is a function address, or is a jump table
419     // address, then generate a TOC entry and reference that.  Otherwise
420     // reference the symbol directly.
421     TmpInst.setOpcode(PPC::ADDIS8);
422     const MachineOperand &MO = MI->getOperand(2);
423     assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
424            "Invalid operand for ADDIStocHA!");
425     MCSymbol *MOSymbol = 0;
426     bool IsExternal = false;
427     bool IsFunction = false;
428     bool IsCommon = false;
429     bool IsAvailExt = false;
430 
431     if (MO.isGlobal()) {
432       const GlobalValue *GValue = MO.getGlobal();
433       const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
434       const GlobalValue *RealGValue = GAlias ?
435         GAlias->resolveAliasedGlobal(false) : GValue;
436       MOSymbol = Mang->getSymbol(RealGValue);
437       const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
438       IsExternal = GVar && !GVar->hasInitializer();
439       IsCommon = GVar && RealGValue->hasCommonLinkage();
440       IsFunction = !GVar;
441       IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage();
442     } else if (MO.isCPI())
443       MOSymbol = GetCPISymbol(MO.getIndex());
444     else if (MO.isJTI())
445       MOSymbol = GetJTISymbol(MO.getIndex());
446 
447     if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI())
448       MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
449 
450     const MCExpr *Exp =
451       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_HA,
452                               OutContext);
453     TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
454     OutStreamer.EmitInstruction(TmpInst);
455     return;
456   }
457   case PPC::LDtocL: {
458     // Transform %Xd = LDtocL <ga:@sym>, %Xs
459     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
460 
461     // Change the opcode to LDrs, which is a form of LD with the offset
462     // specified by a SymbolLo.  If the global address is external, has
463     // common linkage, or is a jump table address, then reference the
464     // associated TOC entry.  Otherwise reference the symbol directly.
465     TmpInst.setOpcode(PPC::LDrs);
466     const MachineOperand &MO = MI->getOperand(1);
467     assert((MO.isGlobal() || MO.isJTI()) && "Invalid operand for LDtocL!");
468     MCSymbol *MOSymbol = 0;
469 
470     if (MO.isJTI())
471       MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
472     else {
473       const GlobalValue *GValue = MO.getGlobal();
474       const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
475       const GlobalValue *RealGValue = GAlias ?
476         GAlias->resolveAliasedGlobal(false) : GValue;
477       MOSymbol = Mang->getSymbol(RealGValue);
478       const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
479 
480       if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
481           RealGValue->hasAvailableExternallyLinkage())
482         MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
483     }
484 
485     const MCExpr *Exp =
486       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_LO,
487                               OutContext);
488     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
489     OutStreamer.EmitInstruction(TmpInst);
490     return;
491   }
492   case PPC::ADDItocL: {
493     // Transform %Xd = ADDItocL %Xs, <ga:@sym>
494     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
495 
496     // Change the opcode to ADDI8L.  If the global address is external, then
497     // generate a TOC entry and reference that.  Otherwise reference the
498     // symbol directly.
499     TmpInst.setOpcode(PPC::ADDI8L);
500     const MachineOperand &MO = MI->getOperand(2);
501     assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
502     MCSymbol *MOSymbol = 0;
503     bool IsExternal = false;
504     bool IsFunction = false;
505 
506     if (MO.isGlobal()) {
507       const GlobalValue *GValue = MO.getGlobal();
508       const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
509       const GlobalValue *RealGValue = GAlias ?
510         GAlias->resolveAliasedGlobal(false) : GValue;
511       MOSymbol = Mang->getSymbol(RealGValue);
512       const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
513       IsExternal = GVar && !GVar->hasInitializer();
514       IsFunction = !GVar;
515     } else if (MO.isCPI())
516       MOSymbol = GetCPISymbol(MO.getIndex());
517 
518     if (IsFunction || IsExternal)
519       MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
520 
521     const MCExpr *Exp =
522       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_LO,
523                               OutContext);
524     TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
525     OutStreamer.EmitInstruction(TmpInst);
526     return;
527   }
528   case PPC::ADDISgotTprelHA: {
529     // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
530     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
531     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
532     const MachineOperand &MO = MI->getOperand(2);
533     const GlobalValue *GValue = MO.getGlobal();
534     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
535     const MCExpr *SymGotTprel =
536       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA,
537                               OutContext);
538     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
539                                 .addReg(MI->getOperand(0).getReg())
540                                 .addReg(PPC::X2)
541                                 .addExpr(SymGotTprel));
542     return;
543   }
544   case PPC::LDgotTprelL: {
545     // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
546     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
547 
548     // Change the opcode to LDrs, which is a form of LD with the offset
549     // specified by a SymbolLo.
550     TmpInst.setOpcode(PPC::LDrs);
551     const MachineOperand &MO = MI->getOperand(1);
552     const GlobalValue *GValue = MO.getGlobal();
553     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
554     const MCExpr *Exp =
555       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO,
556                               OutContext);
557     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
558     OutStreamer.EmitInstruction(TmpInst);
559     return;
560   }
561   case PPC::ADDIStlsgdHA: {
562     // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
563     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
564     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
565     const MachineOperand &MO = MI->getOperand(2);
566     const GlobalValue *GValue = MO.getGlobal();
567     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
568     const MCExpr *SymGotTlsGD =
569       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA,
570                               OutContext);
571     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
572                                 .addReg(MI->getOperand(0).getReg())
573                                 .addReg(PPC::X2)
574                                 .addExpr(SymGotTlsGD));
575     return;
576   }
577   case PPC::ADDItlsgdL: {
578     // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
579     // Into:      %Xd = ADDI8L %Xs, sym@got@tlsgd@l
580     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
581     const MachineOperand &MO = MI->getOperand(2);
582     const GlobalValue *GValue = MO.getGlobal();
583     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
584     const MCExpr *SymGotTlsGD =
585       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO,
586                               OutContext);
587     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L)
588                                 .addReg(MI->getOperand(0).getReg())
589                                 .addReg(MI->getOperand(1).getReg())
590                                 .addExpr(SymGotTlsGD));
591     return;
592   }
593   case PPC::GETtlsADDR: {
594     // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
595     // Into:      BL8_NOP_ELF_TLSGD __tls_get_addr(sym@tlsgd)
596     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
597 
598     StringRef Name = "__tls_get_addr";
599     MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
600     const MCSymbolRefExpr *TlsRef =
601       MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
602     const MachineOperand &MO = MI->getOperand(2);
603     const GlobalValue *GValue = MO.getGlobal();
604     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
605     const MCExpr *SymVar =
606       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
607                               OutContext);
608     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_ELF_TLSGD)
609                                 .addExpr(TlsRef)
610                                 .addExpr(SymVar));
611     return;
612   }
613   case PPC::ADDIStlsldHA: {
614     // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
615     // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
616     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
617     const MachineOperand &MO = MI->getOperand(2);
618     const GlobalValue *GValue = MO.getGlobal();
619     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
620     const MCExpr *SymGotTlsLD =
621       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA,
622                               OutContext);
623     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
624                                 .addReg(MI->getOperand(0).getReg())
625                                 .addReg(PPC::X2)
626                                 .addExpr(SymGotTlsLD));
627     return;
628   }
629   case PPC::ADDItlsldL: {
630     // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
631     // Into:      %Xd = ADDI8L %Xs, sym@got@tlsld@l
632     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
633     const MachineOperand &MO = MI->getOperand(2);
634     const GlobalValue *GValue = MO.getGlobal();
635     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
636     const MCExpr *SymGotTlsLD =
637       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO,
638                               OutContext);
639     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L)
640                                 .addReg(MI->getOperand(0).getReg())
641                                 .addReg(MI->getOperand(1).getReg())
642                                 .addExpr(SymGotTlsLD));
643     return;
644   }
645   case PPC::GETtlsldADDR: {
646     // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
647     // Into:      BL8_NOP_ELF_TLSLD __tls_get_addr(sym@tlsld)
648     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
649 
650     StringRef Name = "__tls_get_addr";
651     MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
652     const MCSymbolRefExpr *TlsRef =
653       MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
654     const MachineOperand &MO = MI->getOperand(2);
655     const GlobalValue *GValue = MO.getGlobal();
656     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
657     const MCExpr *SymVar =
658       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
659                               OutContext);
660     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_ELF_TLSLD)
661                                 .addExpr(TlsRef)
662                                 .addExpr(SymVar));
663     return;
664   }
665   case PPC::ADDISdtprelHA: {
666     // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
667     // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
668     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
669     const MachineOperand &MO = MI->getOperand(2);
670     const GlobalValue *GValue = MO.getGlobal();
671     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
672     const MCExpr *SymDtprel =
673       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL16_HA,
674                               OutContext);
675     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
676                                 .addReg(MI->getOperand(0).getReg())
677                                 .addReg(PPC::X3)
678                                 .addExpr(SymDtprel));
679     return;
680   }
681   case PPC::ADDIdtprelL: {
682     // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
683     // Into:      %Xd = ADDI8L %Xs, sym@dtprel@l
684     assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
685     const MachineOperand &MO = MI->getOperand(2);
686     const GlobalValue *GValue = MO.getGlobal();
687     MCSymbol *MOSymbol = Mang->getSymbol(GValue);
688     const MCExpr *SymDtprel =
689       MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL16_LO,
690                               OutContext);
691     OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L)
692                                 .addReg(MI->getOperand(0).getReg())
693                                 .addReg(MI->getOperand(1).getReg())
694                                 .addExpr(SymDtprel));
695     return;
696   }
697   case PPC::MFCRpseud:
698   case PPC::MFCR8pseud:
699     // Transform: %R3 = MFCRpseud %CR7
700     // Into:      %R3 = MFCR      ;; cr7
701     OutStreamer.AddComment(PPCInstPrinter::
702                            getRegisterName(MI->getOperand(1).getReg()));
703     OutStreamer.EmitInstruction(MCInstBuilder(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR)
704       .addReg(MI->getOperand(0).getReg()));
705     return;
706   case PPC::SYNC:
707     // In Book E sync is called msync, handle this special case here...
708     if (Subtarget.isBookE()) {
709       OutStreamer.EmitRawText(StringRef("\tmsync"));
710       return;
711     }
712   }
713 
714   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
715   OutStreamer.EmitInstruction(TmpInst);
716 }
717 
718 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
719   if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
720     return AsmPrinter::EmitFunctionEntryLabel();
721 
722   // Emit an official procedure descriptor.
723   const MCSection *Current = OutStreamer.getCurrentSection();
724   const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
725       ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
726       SectionKind::getReadOnly());
727   OutStreamer.SwitchSection(Section);
728   OutStreamer.EmitLabel(CurrentFnSym);
729   OutStreamer.EmitValueToAlignment(8);
730   MCSymbol *Symbol1 =
731     OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
732   // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
733   // entry point.
734   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
735 			8 /*size*/);
736   MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
737   // Generates a R_PPC64_TOC relocation for TOC base insertion.
738   OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
739                         MCSymbolRefExpr::VK_PPC_TOC, OutContext),
740                         8/*size*/);
741   // Emit a null environment pointer.
742   OutStreamer.EmitIntValue(0, 8 /* size */);
743   OutStreamer.SwitchSection(Current);
744 
745   MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
746                           ".L." + Twine(CurrentFnSym->getName()));
747   OutStreamer.EmitLabel(RealFnSym);
748   CurrentFnSymForSize = RealFnSym;
749 }
750 
751 
752 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
753   const DataLayout *TD = TM.getDataLayout();
754 
755   bool isPPC64 = TD->getPointerSizeInBits() == 64;
756 
757   if (isPPC64 && !TOC.empty()) {
758     const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
759         ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
760         SectionKind::getReadOnly());
761     OutStreamer.SwitchSection(Section);
762 
763     for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
764          E = TOC.end(); I != E; ++I) {
765       OutStreamer.EmitLabel(I->second);
766       MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
767       OutStreamer.EmitTCEntry(*S);
768     }
769   }
770 
771   MachineModuleInfoELF &MMIELF =
772     MMI->getObjFileInfo<MachineModuleInfoELF>();
773 
774   MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
775   if (!Stubs.empty()) {
776     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
777     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
778       // L_foo$stub:
779       OutStreamer.EmitLabel(Stubs[i].first);
780       //   .long _foo
781       OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
782                                                     OutContext),
783                             isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
784     }
785 
786     Stubs.clear();
787     OutStreamer.AddBlankLine();
788   }
789 
790   return AsmPrinter::doFinalization(M);
791 }
792 
793 /// EmitFunctionBodyEnd - Print the traceback table before the .size
794 /// directive.
795 ///
796 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
797   // Only the 64-bit target requires a traceback table.  For now,
798   // we only emit the word of zeroes that GDB requires to find
799   // the end of the function, and zeroes for the eight-byte
800   // mandatory fields.
801   // FIXME: We should fill in the eight-byte mandatory fields as described in
802   // the PPC64 ELF ABI (this is a low-priority item because GDB does not
803   // currently make use of these fields).
804   if (Subtarget.isPPC64()) {
805     OutStreamer.EmitIntValue(0, 4/*size*/);
806     OutStreamer.EmitIntValue(0, 8/*size*/);
807   }
808 }
809 
810 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
811   static const char *const CPUDirectives[] = {
812     "",
813     "ppc",
814     "ppc440",
815     "ppc601",
816     "ppc602",
817     "ppc603",
818     "ppc7400",
819     "ppc750",
820     "ppc970",
821     "ppcA2",
822     "ppce500mc",
823     "ppce5500",
824     "power3",
825     "power4",
826     "power5",
827     "power5x",
828     "power6",
829     "power6x",
830     "power7",
831     "ppc64"
832   };
833 
834   unsigned Directive = Subtarget.getDarwinDirective();
835   if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
836     Directive = PPC::DIR_970;
837   if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
838     Directive = PPC::DIR_7400;
839   if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
840     Directive = PPC::DIR_64;
841   assert(Directive <= PPC::DIR_64 && "Directive out of range.");
842 
843   // FIXME: This is a total hack, finish mc'izing the PPC backend.
844   if (OutStreamer.hasRawTextSupport()) {
845     assert(Directive < sizeof(CPUDirectives) / sizeof(*CPUDirectives) &&
846            "CPUDirectives[] might not be up-to-date!");
847     OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
848   }
849 
850   // Prime text sections so they are adjacent.  This reduces the likelihood a
851   // large data or debug section causes a branch to exceed 16M limit.
852   const TargetLoweringObjectFileMachO &TLOFMacho =
853     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
854   OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
855   if (TM.getRelocationModel() == Reloc::PIC_) {
856     OutStreamer.SwitchSection(
857            OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
858                                       MCSectionMachO::S_SYMBOL_STUBS |
859                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
860                                       32, SectionKind::getText()));
861   } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
862     OutStreamer.SwitchSection(
863            OutContext.getMachOSection("__TEXT","__symbol_stub1",
864                                       MCSectionMachO::S_SYMBOL_STUBS |
865                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
866                                       16, SectionKind::getText()));
867   }
868   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
869 }
870 
871 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
872   // Remove $stub suffix, add $lazy_ptr.
873   StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
874   return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
875 }
876 
877 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
878   // Add $tmp suffix to $stub, yielding $stub$tmp.
879   return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
880 }
881 
882 void PPCDarwinAsmPrinter::
883 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
884   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
885 
886   const TargetLoweringObjectFileMachO &TLOFMacho =
887     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
888 
889   // .lazy_symbol_pointer
890   const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
891 
892   // Output stubs for dynamically-linked functions
893   if (TM.getRelocationModel() == Reloc::PIC_) {
894     const MCSection *StubSection =
895     OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
896                                MCSectionMachO::S_SYMBOL_STUBS |
897                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
898                                32, SectionKind::getText());
899     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
900       OutStreamer.SwitchSection(StubSection);
901       EmitAlignment(4);
902 
903       MCSymbol *Stub = Stubs[i].first;
904       MCSymbol *RawSym = Stubs[i].second.getPointer();
905       MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
906       MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
907 
908       OutStreamer.EmitLabel(Stub);
909       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
910 
911       // mflr r0
912       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
913       // FIXME: MCize this.
914       OutStreamer.EmitRawText("\tbcl 20, 31, " + Twine(AnonSymbol->getName()));
915       OutStreamer.EmitLabel(AnonSymbol);
916       // mflr r11
917       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
918       // addis r11, r11, ha16(LazyPtr - AnonSymbol)
919       const MCExpr *Sub =
920         MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(LazyPtr, OutContext),
921                                 MCSymbolRefExpr::Create(AnonSymbol, OutContext),
922                                 OutContext);
923       OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
924         .addReg(PPC::R11)
925         .addReg(PPC::R11)
926         .addExpr(Sub));
927       // mtlr r0
928       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
929 
930       // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
931       // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
932       OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
933         .addReg(PPC::R12)
934         .addExpr(Sub).addExpr(Sub)
935         .addReg(PPC::R11));
936       // mtctr r12
937       OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
938       // bctr
939       OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
940 
941       OutStreamer.SwitchSection(LSPSection);
942       OutStreamer.EmitLabel(LazyPtr);
943       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
944 
945       MCSymbol *DyldStubBindingHelper =
946         OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
947       if (isPPC64) {
948         // .quad dyld_stub_binding_helper
949         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
950       } else {
951         // .long dyld_stub_binding_helper
952         OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
953       }
954     }
955     OutStreamer.AddBlankLine();
956     return;
957   }
958 
959   const MCSection *StubSection =
960     OutContext.getMachOSection("__TEXT","__symbol_stub1",
961                                MCSectionMachO::S_SYMBOL_STUBS |
962                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
963                                16, SectionKind::getText());
964   for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
965     MCSymbol *Stub = Stubs[i].first;
966     MCSymbol *RawSym = Stubs[i].second.getPointer();
967     MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
968 
969     OutStreamer.SwitchSection(StubSection);
970     EmitAlignment(4);
971     OutStreamer.EmitLabel(Stub);
972     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
973     // lis r11, ha16(LazyPtr)
974     const MCExpr *LazyPtrHa16 =
975       MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_HA16,
976                               OutContext);
977     OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
978       .addReg(PPC::R11)
979       .addExpr(LazyPtrHa16));
980 
981     const MCExpr *LazyPtrLo16 =
982       MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_LO16,
983                               OutContext);
984     // ldu r12, lo16(LazyPtr)(r11)
985     // lwzu r12, lo16(LazyPtr)(r11)
986     OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
987       .addReg(PPC::R12)
988       .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
989       .addReg(PPC::R11));
990 
991     // mtctr r12
992     OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
993     // bctr
994     OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
995 
996     OutStreamer.SwitchSection(LSPSection);
997     OutStreamer.EmitLabel(LazyPtr);
998     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
999 
1000     MCSymbol *DyldStubBindingHelper =
1001       OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1002     if (isPPC64) {
1003       // .quad dyld_stub_binding_helper
1004       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1005     } else {
1006       // .long dyld_stub_binding_helper
1007       OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1008     }
1009   }
1010 
1011   OutStreamer.AddBlankLine();
1012 }
1013 
1014 
1015 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1016   bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1017 
1018   // Darwin/PPC always uses mach-o.
1019   const TargetLoweringObjectFileMachO &TLOFMacho =
1020     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1021   MachineModuleInfoMachO &MMIMacho =
1022     MMI->getObjFileInfo<MachineModuleInfoMachO>();
1023 
1024   MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1025   if (!Stubs.empty())
1026     EmitFunctionStubs(Stubs);
1027 
1028   if (MAI->doesSupportExceptionHandling() && MMI) {
1029     // Add the (possibly multiple) personalities to the set of global values.
1030     // Only referenced functions get into the Personalities list.
1031     const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1032     for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1033          E = Personalities.end(); I != E; ++I) {
1034       if (*I) {
1035         MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1036         MachineModuleInfoImpl::StubValueTy &StubSym =
1037           MMIMacho.getGVStubEntry(NLPSym);
1038         StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1039       }
1040     }
1041   }
1042 
1043   // Output stubs for dynamically-linked functions.
1044   Stubs = MMIMacho.GetGVStubList();
1045 
1046   // Output macho stubs for external and common global variables.
1047   if (!Stubs.empty()) {
1048     // Switch with ".non_lazy_symbol_pointer" directive.
1049     OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1050     EmitAlignment(isPPC64 ? 3 : 2);
1051 
1052     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1053       // L_foo$stub:
1054       OutStreamer.EmitLabel(Stubs[i].first);
1055       //   .indirect_symbol _foo
1056       MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1057       OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1058 
1059       if (MCSym.getInt())
1060         // External to current translation unit.
1061         OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1062       else
1063         // Internal to current translation unit.
1064         //
1065         // When we place the LSDA into the TEXT section, the type info pointers
1066         // need to be indirect and pc-rel. We accomplish this by using NLPs.
1067         // However, sometimes the types are local to the file. So we need to
1068         // fill in the value for the NLP in those cases.
1069         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1070                                                       OutContext),
1071                               isPPC64 ? 8 : 4/*size*/);
1072     }
1073 
1074     Stubs.clear();
1075     OutStreamer.AddBlankLine();
1076   }
1077 
1078   Stubs = MMIMacho.GetHiddenGVStubList();
1079   if (!Stubs.empty()) {
1080     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1081     EmitAlignment(isPPC64 ? 3 : 2);
1082 
1083     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1084       // L_foo$stub:
1085       OutStreamer.EmitLabel(Stubs[i].first);
1086       //   .long _foo
1087       OutStreamer.EmitValue(MCSymbolRefExpr::
1088                             Create(Stubs[i].second.getPointer(),
1089                                    OutContext),
1090                             isPPC64 ? 8 : 4/*size*/);
1091     }
1092 
1093     Stubs.clear();
1094     OutStreamer.AddBlankLine();
1095   }
1096 
1097   // Funny Darwin hack: This flag tells the linker that no global symbols
1098   // contain code that falls through to other global symbols (e.g. the obvious
1099   // implementation of multiple entry points).  If this doesn't occur, the
1100   // linker can safely perform dead code stripping.  Since LLVM never generates
1101   // code that does this, it is always safe to set.
1102   OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1103 
1104   return AsmPrinter::doFinalization(M);
1105 }
1106 
1107 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1108 /// for a MachineFunction to the given output stream, in a format that the
1109 /// Darwin assembler can deal with.
1110 ///
1111 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1112                                            MCStreamer &Streamer) {
1113   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1114 
1115   if (Subtarget->isDarwin())
1116     return new PPCDarwinAsmPrinter(tm, Streamer);
1117   return new PPCLinuxAsmPrinter(tm, Streamer);
1118 }
1119 
1120 // Force static initialization.
1121 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1122   TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1123   TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1124 }
1125