lib/Target/PowerPC/PPCAsmPrinter.cpp

   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 "PPCPredicates.h"
  22 #include "PPCTargetMachine.h"
  23 #include "PPCSubtarget.h"
  24 #include "llvm/Analysis/DebugInfo.h"
  25 #include "llvm/Constants.h"
  26 #include "llvm/DerivedTypes.h"
  27 #include "llvm/Module.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/MC/MCAsmInfo.h"
  36 #include "llvm/MC/MCContext.h"
  37 #include "llvm/MC/MCExpr.h"
  38 #include "llvm/MC/MCInst.h"
  39 #include "llvm/MC/MCSectionMachO.h"
  40 #include "llvm/MC/MCStreamer.h"
  41 #include "llvm/MC/MCSymbol.h"
  42 #include "llvm/Target/Mangler.h"
  43 #include "llvm/Target/TargetRegisterInfo.h"
  44 #include "llvm/Target/TargetInstrInfo.h"
  45 #include "llvm/Target/TargetOptions.h"
  46 #include "llvm/Target/TargetRegistry.h"
  47 #include "llvm/Support/CommandLine.h"
  48 #include "llvm/Support/Debug.h"
  49 #include "llvm/Support/MathExtras.h"
  50 #include "llvm/Support/ErrorHandling.h"
  51 #include "llvm/Support/raw_ostream.h"
  52 #include "llvm/ADT/StringExtras.h"
  53 #include "llvm/ADT/StringSet.h"
  54 #include "llvm/ADT/SmallString.h"
  55 #include "InstPrinter/PPCInstPrinter.h"
  56 using namespace llvm;
  57
  58 namespace {
  59   class PPCAsmPrinter : public AsmPrinter {
  60   protected:
  61     DenseMap<MCSymbol*, MCSymbol*> TOC;
  62     const PPCSubtarget &Subtarget;
  63     uint64_t TOCLabelID;
  64   public:
  65     explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
  66       : AsmPrinter(TM, Streamer),
  67         Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
  68
  69     virtual const char *getPassName() const {
  70       return "PowerPC Assembly Printer";
  71     }
  72
  73
  74     virtual void EmitInstruction(const MachineInstr *MI);
  75
  76     void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
  77
  78     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  79                          unsigned AsmVariant, const char *ExtraCode,
  80                          raw_ostream &O);
  81     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
  82                                unsigned AsmVariant, const char *ExtraCode,
  83                                raw_ostream &O);
  84
  85     MachineLocation getDebugValueLocation(const MachineInstr *MI) const {
  86       MachineLocation Location;
  87       assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
  88       // Frame address.  Currently handles register +- offset only.
  89       if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm())
  90         Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm());
  91       else {
  92         DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
  93       }
  94       return Location;
  95     }
  96   };
  97
  98   /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
  99   class PPCLinuxAsmPrinter : public PPCAsmPrinter {
 100   public:
 101     explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
 102       : PPCAsmPrinter(TM, Streamer) {}
 103
 104     virtual const char *getPassName() const {
 105       return "Linux PPC Assembly Printer";
 106     }
 107
 108     bool doFinalization(Module &M);
 109
 110     virtual void EmitFunctionEntryLabel();
 111   };
 112
 113   /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
 114   /// OS X
 115   class PPCDarwinAsmPrinter : public PPCAsmPrinter {
 116   public:
 117     explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
 118       : PPCAsmPrinter(TM, Streamer) {}
 119
 120     virtual const char *getPassName() const {
 121       return "Darwin PPC Assembly Printer";
 122     }
 123
 124     bool doFinalization(Module &M);
 125     void EmitStartOfAsmFile(Module &M);
 126
 127     void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
 128   };
 129 } // end of anonymous namespace
 130
 131 /// stripRegisterPrefix - This method strips the character prefix from a
 132 /// register name so that only the number is left.  Used by for linux asm.
 133 static const char *stripRegisterPrefix(const char *RegName) {
 134   switch (RegName[0]) {
 135     case 'r':
 136     case 'f':
 137     case 'v': return RegName + 1;
 138     case 'c': if (RegName[1] == 'r') return RegName + 2;
 139   }
 140
 141   return RegName;
 142 }
 143
 144 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 145                                  raw_ostream &O) {
 146   const MachineOperand &MO = MI->getOperand(OpNo);
 147
 148   switch (MO.getType()) {
 149   case MachineOperand::MO_Register: {
 150     const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
 151     // Linux assembler (Others?) does not take register mnemonics.
 152     // FIXME - What about special registers used in mfspr/mtspr?
 153     if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
 154     O << RegName;
 155     return;
 156   }
 157   case MachineOperand::MO_Immediate:
 158     O << MO.getImm();
 159     return;
 160
 161   case MachineOperand::MO_MachineBasicBlock:
 162     O << *MO.getMBB()->getSymbol();
 163     return;
 164   case MachineOperand::MO_JumpTableIndex:
 165     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 166       << '_' << MO.getIndex();
 167     // FIXME: PIC relocation model
 168     return;
 169   case MachineOperand::MO_ConstantPoolIndex:
 170     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
 171       << '_' << MO.getIndex();
 172     return;
 173   case MachineOperand::MO_BlockAddress:
 174     O << *GetBlockAddressSymbol(MO.getBlockAddress());
 175     return;
 176   case MachineOperand::MO_ExternalSymbol: {
 177     // Computing the address of an external symbol, not calling it.
 178     if (TM.getRelocationModel() == Reloc::Static) {
 179       O << *GetExternalSymbolSymbol(MO.getSymbolName());
 180       return;
 181     }
 182
 183     MCSymbol *NLPSym =
 184       OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
 185                                    MO.getSymbolName()+"$non_lazy_ptr");
 186     MachineModuleInfoImpl::StubValueTy &StubSym =
 187       MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
 188     if (StubSym.getPointer() == 0)
 189       StubSym = MachineModuleInfoImpl::
 190         StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
 191
 192     O << *NLPSym;
 193     return;
 194   }
 195   case MachineOperand::MO_GlobalAddress: {
 196     // Computing the address of a global symbol, not calling it.
 197     const GlobalValue *GV = MO.getGlobal();
 198     MCSymbol *SymToPrint;
 199
 200     // External or weakly linked global variables need non-lazily-resolved stubs
 201     if (TM.getRelocationModel() != Reloc::Static &&
 202         (GV->isDeclaration() || GV->isWeakForLinker())) {
 203       if (!GV->hasHiddenVisibility()) {
 204         SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 205         MachineModuleInfoImpl::StubValueTy &StubSym =
 206           MMI->getObjFileInfo<MachineModuleInfoMachO>()
 207             .getGVStubEntry(SymToPrint);
 208         if (StubSym.getPointer() == 0)
 209           StubSym = MachineModuleInfoImpl::
 210             StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
 211       } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
 212                  GV->hasAvailableExternallyLinkage()) {
 213         SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 214
 215         MachineModuleInfoImpl::StubValueTy &StubSym =
 216           MMI->getObjFileInfo<MachineModuleInfoMachO>().
 217                     getHiddenGVStubEntry(SymToPrint);
 218         if (StubSym.getPointer() == 0)
 219           StubSym = MachineModuleInfoImpl::
 220             StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
 221       } else {
 222         SymToPrint = Mang->getSymbol(GV);
 223       }
 224     } else {
 225       SymToPrint = Mang->getSymbol(GV);
 226     }
 227
 228     O << *SymToPrint;
 229
 230     printOffset(MO.getOffset(), O);
 231     return;
 232   }
 233
 234   default:
 235     O << "<unknown operand type: " << MO.getType() << ">";
 236     return;
 237   }
 238 }
 239
 240 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 241 ///
 242 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 243                                     unsigned AsmVariant,
 244                                     const char *ExtraCode, raw_ostream &O) {
 245   // Does this asm operand have a single letter operand modifier?
 246   if (ExtraCode && ExtraCode[0]) {
 247     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 248
 249     switch (ExtraCode[0]) {
 250     default: return true;  // Unknown modifier.
 251     case 'c': // Don't print "$" before a global var name or constant.
 252       break; // PPC never has a prefix.
 253     case 'L': // Write second word of DImode reference.
 254       // Verify that this operand has two consecutive registers.
 255       if (!MI->getOperand(OpNo).isReg() ||
 256           OpNo+1 == MI->getNumOperands() ||
 257           !MI->getOperand(OpNo+1).isReg())
 258         return true;
 259       ++OpNo;   // Return the high-part.
 260       break;
 261     case 'I':
 262       // Write 'i' if an integer constant, otherwise nothing.  Used to print
 263       // addi vs add, etc.
 264       if (MI->getOperand(OpNo).isImm())
 265         O << "i";
 266       return false;
 267     }
 268   }
 269
 270   printOperand(MI, OpNo, O);
 271   return false;
 272 }
 273
 274 // At the moment, all inline asm memory operands are a single register.
 275 // In any case, the output of this routine should always be just one
 276 // assembler operand.
 277
 278 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
 279                                           unsigned AsmVariant,
 280                                           const char *ExtraCode,
 281                                           raw_ostream &O) {
 282   if (ExtraCode && ExtraCode[0])
 283     return true; // Unknown modifier.
 284   assert(MI->getOperand(OpNo).isReg());
 285   O << "0(";
 286   printOperand(MI, OpNo, O);
 287   O << ")";
 288   return false;
 289 }
 290
 291
 292 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
 293 /// the current output stream.
 294 ///
 295 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
 296   MCInst TmpInst;
 297
 298   // Lower multi-instruction pseudo operations.
 299   switch (MI->getOpcode()) {
 300   default: break;
 301   case TargetOpcode::DBG_VALUE: {
 302     if (!isVerbose() || !OutStreamer.hasRawTextSupport()) return;
 303
 304     SmallString<32> Str;
 305     raw_svector_ostream O(Str);
 306     unsigned NOps = MI->getNumOperands();
 307     assert(NOps==4);
 308     O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
 309     // cast away const; DIetc do not take const operands for some reason.
 310     DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
 311     O << V.getName();
 312     O << " <- ";
 313     // Frame address.  Currently handles register +- offset only.
 314     assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
 315     O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O);
 316     O << ']';
 317     O << "+";
 318     printOperand(MI, NOps-2, O);
 319     OutStreamer.EmitRawText(O.str());
 320     return;
 321   }
 322
 323   case PPC::MovePCtoLR:
 324   case PPC::MovePCtoLR8: {
 325     // Transform %LR = MovePCtoLR
 326     // Into this, where the label is the PIC base:
 327     //     bl L1$pb
 328     // L1$pb:
 329     MCSymbol *PICBase = MF->getPICBaseSymbol();
 330
 331     // Emit the 'bl'.
 332     TmpInst.setOpcode(PPC::BL_Darwin); // Darwin vs SVR4 doesn't matter here.
 333
 334
 335     // FIXME: We would like an efficient form for this, so we don't have to do
 336     // a lot of extra uniquing.
 337     TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::
 338                                              Create(PICBase, OutContext)));
 339     OutStreamer.EmitInstruction(TmpInst);
 340
 341     // Emit the label.
 342     OutStreamer.EmitLabel(PICBase);
 343     return;
 344   }
 345   case PPC::LDtoc: {
 346     // Transform %X3 = LDtoc <ga:@min1>, %X2
 347     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
 348
 349     // Change the opcode to LD, and the global address operand to be a
 350     // reference to the TOC entry we will synthesize later.
 351     TmpInst.setOpcode(PPC::LD);
 352     const MachineOperand &MO = MI->getOperand(1);
 353     assert(MO.isGlobal());
 354
 355     // Map symbol -> label of TOC entry.
 356     MCSymbol *&TOCEntry = TOC[Mang->getSymbol(MO.getGlobal())];
 357     if (TOCEntry == 0)
 358       TOCEntry = GetTempSymbol("C", TOCLabelID++);
 359
 360     const MCExpr *Exp =
 361       MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
 362                               OutContext);
 363     TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
 364     OutStreamer.EmitInstruction(TmpInst);
 365     return;
 366   }
 367
 368   case PPC::MFCRpseud:
 369     // Transform: %R3 = MFCRpseud %CR7
 370     // Into:      %R3 = MFCR      ;; cr7
 371     OutStreamer.AddComment(PPCInstPrinter::
 372                            getRegisterName(MI->getOperand(1).getReg()));
 373     TmpInst.setOpcode(PPC::MFCR);
 374     TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
 375     OutStreamer.EmitInstruction(TmpInst);
 376     return;
 377   }
 378
 379   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
 380   OutStreamer.EmitInstruction(TmpInst);
 381 }
 382
 383 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
 384   if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
 385     return AsmPrinter::EmitFunctionEntryLabel();
 386
 387   // Emit an official procedure descriptor.
 388   // FIXME 64-bit SVR4: Use MCSection here!
 389   OutStreamer.EmitRawText(StringRef("\t.section\t\".opd\",\"aw\""));
 390   OutStreamer.EmitRawText(StringRef("\t.align 3"));
 391   OutStreamer.EmitLabel(CurrentFnSym);
 392   OutStreamer.EmitRawText("\t.quad .L." + Twine(CurrentFnSym->getName()) +
 393                           ",.TOC.@tocbase");
 394   OutStreamer.EmitRawText(StringRef("\t.previous"));
 395   OutStreamer.EmitRawText(".L." + Twine(CurrentFnSym->getName()) + ":");
 396 }
 397
 398
 399 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
 400   const TargetData *TD = TM.getTargetData();
 401
 402   bool isPPC64 = TD->getPointerSizeInBits() == 64;
 403
 404   if (isPPC64 && !TOC.empty()) {
 405     // FIXME 64-bit SVR4: Use MCSection here?
 406     OutStreamer.EmitRawText(StringRef("\t.section\t\".toc\",\"aw\""));
 407
 408     // FIXME: This is nondeterminstic!
 409     for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
 410          E = TOC.end(); I != E; ++I) {
 411       OutStreamer.EmitLabel(I->second);
 412       OutStreamer.EmitRawText("\t.tc " + Twine(I->first->getName()) +
 413                               "[TC]," + I->first->getName());
 414     }
 415   }
 416
 417   return AsmPrinter::doFinalization(M);
 418 }
 419
 420 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
 421   static const char *const CPUDirectives[] = {
 422     "",
 423     "ppc",
 424     "ppc601",
 425     "ppc602",
 426     "ppc603",
 427     "ppc7400",
 428     "ppc750",
 429     "ppc970",
 430     "ppc64"
 431   };
 432
 433   unsigned Directive = Subtarget.getDarwinDirective();
 434   if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
 435     Directive = PPC::DIR_970;
 436   if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
 437     Directive = PPC::DIR_7400;
 438   if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
 439     Directive = PPC::DIR_64;
 440   assert(Directive <= PPC::DIR_64 && "Directive out of range.");
 441
 442   // FIXME: This is a total hack, finish mc'izing the PPC backend.
 443   if (OutStreamer.hasRawTextSupport())
 444     OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
 445
 446   // Prime text sections so they are adjacent.  This reduces the likelihood a
 447   // large data or debug section causes a branch to exceed 16M limit.
 448   const TargetLoweringObjectFileMachO &TLOFMacho =
 449     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
 450   OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
 451   if (TM.getRelocationModel() == Reloc::PIC_) {
 452     OutStreamer.SwitchSection(
 453            OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
 454                                       MCSectionMachO::S_SYMBOL_STUBS |
 455                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 456                                       32, SectionKind::getText()));
 457   } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
 458     OutStreamer.SwitchSection(
 459            OutContext.getMachOSection("__TEXT","__symbol_stub1",
 460                                       MCSectionMachO::S_SYMBOL_STUBS |
 461                                       MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 462                                       16, SectionKind::getText()));
 463   }
 464   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
 465 }
 466
 467 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
 468   // Remove $stub suffix, add $lazy_ptr.
 469   SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()-5);
 470   TmpStr += "$lazy_ptr";
 471   return Ctx.GetOrCreateSymbol(TmpStr.str());
 472 }
 473
 474 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
 475   // Add $tmp suffix to $stub, yielding $stub$tmp.
 476   SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end());
 477   TmpStr += "$tmp";
 478   return Ctx.GetOrCreateSymbol(TmpStr.str());
 479 }
 480
 481 void PPCDarwinAsmPrinter::
 482 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
 483   bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
 484
 485   const TargetLoweringObjectFileMachO &TLOFMacho =
 486     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
 487
 488   // .lazy_symbol_pointer
 489   const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
 490
 491   // Output stubs for dynamically-linked functions
 492   if (TM.getRelocationModel() == Reloc::PIC_) {
 493     const MCSection *StubSection =
 494     OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
 495                                MCSectionMachO::S_SYMBOL_STUBS |
 496                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 497                                32, SectionKind::getText());
 498     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 499       OutStreamer.SwitchSection(StubSection);
 500       EmitAlignment(4);
 501
 502       MCSymbol *Stub = Stubs[i].first;
 503       MCSymbol *RawSym = Stubs[i].second.getPointer();
 504       MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
 505       MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
 506
 507       OutStreamer.EmitLabel(Stub);
 508       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
 509       // FIXME: MCize this.
 510       OutStreamer.EmitRawText(StringRef("\tmflr r0"));
 511       OutStreamer.EmitRawText("\tbcl 20,31," + Twine(AnonSymbol->getName()));
 512       OutStreamer.EmitLabel(AnonSymbol);
 513       OutStreamer.EmitRawText(StringRef("\tmflr r11"));
 514       OutStreamer.EmitRawText("\taddis r11,r11,ha16("+Twine(LazyPtr->getName())+
 515                               "-" + AnonSymbol->getName() + ")");
 516       OutStreamer.EmitRawText(StringRef("\tmtlr r0"));
 517
 518       if (isPPC64)
 519         OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
 520                                 "-" + AnonSymbol->getName() + ")(r11)");
 521       else
 522         OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
 523                                 "-" + AnonSymbol->getName() + ")(r11)");
 524       OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
 525       OutStreamer.EmitRawText(StringRef("\tbctr"));
 526
 527       OutStreamer.SwitchSection(LSPSection);
 528       OutStreamer.EmitLabel(LazyPtr);
 529       OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
 530
 531       if (isPPC64)
 532         OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
 533       else
 534         OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
 535     }
 536     OutStreamer.AddBlankLine();
 537     return;
 538   }
 539
 540   const MCSection *StubSection =
 541     OutContext.getMachOSection("__TEXT","__symbol_stub1",
 542                                MCSectionMachO::S_SYMBOL_STUBS |
 543                                MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 544                                16, SectionKind::getText());
 545   for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 546     MCSymbol *Stub = Stubs[i].first;
 547     MCSymbol *RawSym = Stubs[i].second.getPointer();
 548     MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
 549
 550     OutStreamer.SwitchSection(StubSection);
 551     EmitAlignment(4);
 552     OutStreamer.EmitLabel(Stub);
 553     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
 554     OutStreamer.EmitRawText("\tlis r11,ha16(" + Twine(LazyPtr->getName()) +")");
 555     if (isPPC64)
 556       OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
 557                               ")(r11)");
 558     else
 559       OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
 560                               ")(r11)");
 561     OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
 562     OutStreamer.EmitRawText(StringRef("\tbctr"));
 563     OutStreamer.SwitchSection(LSPSection);
 564     OutStreamer.EmitLabel(LazyPtr);
 565     OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
 566
 567     if (isPPC64)
 568       OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
 569     else
 570       OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
 571   }
 572
 573   OutStreamer.AddBlankLine();
 574 }
 575
 576
 577 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
 578   bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
 579
 580   // Darwin/PPC always uses mach-o.
 581   const TargetLoweringObjectFileMachO &TLOFMacho =
 582     static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
 583   MachineModuleInfoMachO &MMIMacho =
 584     MMI->getObjFileInfo<MachineModuleInfoMachO>();
 585
 586   MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
 587   if (!Stubs.empty())
 588     EmitFunctionStubs(Stubs);
 589
 590   if (MAI->doesSupportExceptionHandling() && MMI) {
 591     // Add the (possibly multiple) personalities to the set of global values.
 592     // Only referenced functions get into the Personalities list.
 593     const std::vector<const Function*> &Personalities = MMI->getPersonalities();
 594     for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
 595          E = Personalities.end(); I != E; ++I) {
 596       if (*I) {
 597         MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
 598         MachineModuleInfoImpl::StubValueTy &StubSym =
 599           MMIMacho.getGVStubEntry(NLPSym);
 600         StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
 601       }
 602     }
 603   }
 604
 605   // Output stubs for dynamically-linked functions.
 606   Stubs = MMIMacho.GetGVStubList();
 607
 608   // Output macho stubs for external and common global variables.
 609   if (!Stubs.empty()) {
 610     // Switch with ".non_lazy_symbol_pointer" directive.
 611     OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
 612     EmitAlignment(isPPC64 ? 3 : 2);
 613
 614     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 615       // L_foo$stub:
 616       OutStreamer.EmitLabel(Stubs[i].first);
 617       //   .indirect_symbol _foo
 618       MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
 619       OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
 620
 621       if (MCSym.getInt())
 622         // External to current translation unit.
 623         OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
 624       else
 625         // Internal to current translation unit.
 626         //
 627         // When we place the LSDA into the TEXT section, the type info pointers
 628         // need to be indirect and pc-rel. We accomplish this by using NLPs.
 629         // However, sometimes the types are local to the file. So we need to
 630         // fill in the value for the NLP in those cases.
 631         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
 632                                                       OutContext),
 633                               isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
 634     }
 635
 636     Stubs.clear();
 637     OutStreamer.AddBlankLine();
 638   }
 639
 640   Stubs = MMIMacho.GetHiddenGVStubList();
 641   if (!Stubs.empty()) {
 642     OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
 643     EmitAlignment(isPPC64 ? 3 : 2);
 644
 645     for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 646       // L_foo$stub:
 647       OutStreamer.EmitLabel(Stubs[i].first);
 648       //   .long _foo
 649       OutStreamer.EmitValue(MCSymbolRefExpr::
 650                             Create(Stubs[i].second.getPointer(),
 651                                    OutContext),
 652                             isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
 653     }
 654
 655     Stubs.clear();
 656     OutStreamer.AddBlankLine();
 657   }
 658
 659   // Funny Darwin hack: This flag tells the linker that no global symbols
 660   // contain code that falls through to other global symbols (e.g. the obvious
 661   // implementation of multiple entry points).  If this doesn't occur, the
 662   // linker can safely perform dead code stripping.  Since LLVM never generates
 663   // code that does this, it is always safe to set.
 664   OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 665
 666   return AsmPrinter::doFinalization(M);
 667 }
 668
 669 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
 670 /// for a MachineFunction to the given output stream, in a format that the
 671 /// Darwin assembler can deal with.
 672 ///
 673 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
 674                                            MCStreamer &Streamer) {
 675   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
 676
 677   if (Subtarget->isDarwin())
 678     return new PPCDarwinAsmPrinter(tm, Streamer);
 679   return new PPCLinuxAsmPrinter(tm, Streamer);
 680 }
 681
 682 static MCInstPrinter *createPPCMCInstPrinter(const Target &T,
 683                                              unsigned SyntaxVariant,
 684                                              const MCAsmInfo &MAI) {
 685   return new PPCInstPrinter(MAI, SyntaxVariant);
 686 }
 687
 688
 689 // Force static initialization.
 690 extern "C" void LLVMInitializePowerPCAsmPrinter() {
 691   TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
 692   TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
 693
 694   TargetRegistry::RegisterMCInstPrinter(ThePPC32Target, createPPCMCInstPrinter);
 695   TargetRegistry::RegisterMCInstPrinter(ThePPC64Target, createPPCMCInstPrinter);
 696 }