PPCAsmPrinter.cpp revision c38c1d135cb9d617254c396c22949baca024dd35 
1//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a printer that converts from our internal representation
11// of machine-dependent LLVM code to PowerPC assembly language. This printer is
12// the output mechanism used by `llc'.
13//
14// Documentation at http://developer.apple.com/documentation/DeveloperTools/
15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
16//
17//===----------------------------------------------------------------------===//
18
19#define DEBUG_TYPE "asmprinter"
20#include "PPC.h"
21#include "InstPrinter/PPCInstPrinter.h"
22#include "MCTargetDesc/PPCPredicates.h"
23#include "MCTargetDesc/PPCMCExpr.h"
24#include "PPCSubtarget.h"
25#include "PPCTargetMachine.h"
26#include "llvm/ADT/MapVector.h"
27#include "llvm/ADT/SmallString.h"
28#include "llvm/ADT/StringExtras.h"
29#include "llvm/Assembly/Writer.h"
30#include "llvm/CodeGen/AsmPrinter.h"
31#include "llvm/CodeGen/MachineFunctionPass.h"
32#include "llvm/CodeGen/MachineInstr.h"
33#include "llvm/CodeGen/MachineInstrBuilder.h"
34#include "llvm/CodeGen/MachineModuleInfoImpls.h"
35#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
36#include "llvm/DebugInfo.h"
37#include "llvm/IR/Constants.h"
38#include "llvm/IR/DerivedTypes.h"
39#include "llvm/IR/Module.h"
40#include "llvm/MC/MCAsmInfo.h"
41#include "llvm/MC/MCContext.h"
42#include "llvm/MC/MCExpr.h"
43#include "llvm/MC/MCInst.h"
44#include "llvm/MC/MCInstBuilder.h"
45#include "llvm/MC/MCSectionELF.h"
46#include "llvm/MC/MCSectionMachO.h"
47#include "llvm/MC/MCStreamer.h"
48#include "llvm/MC/MCSymbol.h"
49#include "llvm/Support/CommandLine.h"
50#include "llvm/Support/Debug.h"
51#include "llvm/Support/ELF.h"
52#include "llvm/Support/ErrorHandling.h"
53#include "llvm/Support/MathExtras.h"
54#include "llvm/Support/TargetRegistry.h"
55#include "llvm/Support/raw_ostream.h"
56#include "llvm/Target/Mangler.h"
57#include "llvm/Target/TargetInstrInfo.h"
58#include "llvm/Target/TargetOptions.h"
59#include "llvm/Target/TargetRegisterInfo.h"
60using namespace llvm;
61
62namespace {
63  class PPCAsmPrinter : public AsmPrinter {
64  protected:
65    MapVector<MCSymbol*, MCSymbol*> TOC;
66    const PPCSubtarget &Subtarget;
67    uint64_t TOCLabelID;
68  public:
69    explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
70      : AsmPrinter(TM, Streamer),
71        Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
72
73    virtual const char *getPassName() const {
74      return "PowerPC Assembly Printer";
75    }
76
77    MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
78
79    virtual void EmitInstruction(const MachineInstr *MI);
80
81    void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
82
83    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
84                         unsigned AsmVariant, const char *ExtraCode,
85                         raw_ostream &O);
86    bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
87                               unsigned AsmVariant, const char *ExtraCode,
88                               raw_ostream &O);
89  };
90
91  /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
92  class PPCLinuxAsmPrinter : public PPCAsmPrinter {
93  public:
94    explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
95      : PPCAsmPrinter(TM, Streamer) {}
96
97    virtual const char *getPassName() const {
98      return "Linux PPC Assembly Printer";
99    }
100
101    bool doFinalization(Module &M);
102
103    virtual void EmitFunctionEntryLabel();
104
105    void EmitFunctionBodyEnd();
106  };
107
108  /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
109  /// OS X
110  class PPCDarwinAsmPrinter : public PPCAsmPrinter {
111  public:
112    explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
113      : PPCAsmPrinter(TM, Streamer) {}
114
115    virtual const char *getPassName() const {
116      return "Darwin PPC Assembly Printer";
117    }
118
119    bool doFinalization(Module &M);
120    void EmitStartOfAsmFile(Module &M);
121
122    void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
123  };
124} // end of anonymous namespace
125
126/// stripRegisterPrefix - This method strips the character prefix from a
127/// register name so that only the number is left.  Used by for linux asm.
128static const char *stripRegisterPrefix(const char *RegName) {
129  switch (RegName[0]) {
130    case 'r':
131    case 'f':
132    case 'v': return RegName + 1;
133    case 'c': if (RegName[1] == 'r') return RegName + 2;
134  }
135
136  return RegName;
137}
138
139void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
140                                 raw_ostream &O) {
141  const MachineOperand &MO = MI->getOperand(OpNo);
142
143  switch (MO.getType()) {
144  case MachineOperand::MO_Register: {
145    const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
146    // Linux assembler (Others?) does not take register mnemonics.
147    // FIXME - What about special registers used in mfspr/mtspr?
148    if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
149    O << RegName;
150    return;
151  }
152  case MachineOperand::MO_Immediate:
153    O << MO.getImm();
154    return;
155
156  case MachineOperand::MO_MachineBasicBlock:
157    O << *MO.getMBB()->getSymbol();
158    return;
159  case MachineOperand::MO_JumpTableIndex:
160    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
161      << '_' << MO.getIndex();
162    // FIXME: PIC relocation model
163    return;
164  case MachineOperand::MO_ConstantPoolIndex:
165    O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166      << '_' << MO.getIndex();
167    return;
168  case MachineOperand::MO_BlockAddress:
169    O << *GetBlockAddressSymbol(MO.getBlockAddress());
170    return;
171  case MachineOperand::MO_ExternalSymbol: {
172    // Computing the address of an external symbol, not calling it.
173    if (TM.getRelocationModel() == Reloc::Static) {
174      O << *GetExternalSymbolSymbol(MO.getSymbolName());
175      return;
176    }
177
178    MCSymbol *NLPSym =
179      OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
180                                   MO.getSymbolName()+"$non_lazy_ptr");
181    MachineModuleInfoImpl::StubValueTy &StubSym =
182      MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
183    if (StubSym.getPointer() == 0)
184      StubSym = MachineModuleInfoImpl::
185        StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
186
187    O << *NLPSym;
188    return;
189  }
190  case MachineOperand::MO_GlobalAddress: {
191    // Computing the address of a global symbol, not calling it.
192    const GlobalValue *GV = MO.getGlobal();
193    MCSymbol *SymToPrint;
194
195    // External or weakly linked global variables need non-lazily-resolved stubs
196    if (TM.getRelocationModel() != Reloc::Static &&
197        (GV->isDeclaration() || GV->isWeakForLinker())) {
198      if (!GV->hasHiddenVisibility()) {
199        SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
200        MachineModuleInfoImpl::StubValueTy &StubSym =
201          MMI->getObjFileInfo<MachineModuleInfoMachO>()
202            .getGVStubEntry(SymToPrint);
203        if (StubSym.getPointer() == 0)
204          StubSym = MachineModuleInfoImpl::
205            StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
206      } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
207                 GV->hasAvailableExternallyLinkage()) {
208        SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
209
210        MachineModuleInfoImpl::StubValueTy &StubSym =
211          MMI->getObjFileInfo<MachineModuleInfoMachO>().
212                    getHiddenGVStubEntry(SymToPrint);
213        if (StubSym.getPointer() == 0)
214          StubSym = MachineModuleInfoImpl::
215            StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
216      } else {
217        SymToPrint = Mang->getSymbol(GV);
218      }
219    } else {
220      SymToPrint = Mang->getSymbol(GV);
221    }
222
223    O << *SymToPrint;
224
225    printOffset(MO.getOffset(), O);
226    return;
227  }
228
229  default:
230    O << "<unknown operand type: " << MO.getType() << ">";
231    return;
232  }
233}
234
235/// PrintAsmOperand - Print out an operand for an inline asm expression.
236///
237bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
238                                    unsigned AsmVariant,
239                                    const char *ExtraCode, raw_ostream &O) {
240  // Does this asm operand have a single letter operand modifier?
241  if (ExtraCode && ExtraCode[0]) {
242    if (ExtraCode[1] != 0) return true; // Unknown modifier.
243
244    switch (ExtraCode[0]) {
245    default:
246      // See if this is a generic print operand
247      return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248    case 'c': // Don't print "$" before a global var name or constant.
249      break; // PPC never has a prefix.
250    case 'L': // Write second word of DImode reference.
251      // Verify that this operand has two consecutive registers.
252      if (!MI->getOperand(OpNo).isReg() ||
253          OpNo+1 == MI->getNumOperands() ||
254          !MI->getOperand(OpNo+1).isReg())
255        return true;
256      ++OpNo;   // Return the high-part.
257      break;
258    case 'I':
259      // Write 'i' if an integer constant, otherwise nothing.  Used to print
260      // addi vs add, etc.
261      if (MI->getOperand(OpNo).isImm())
262        O << "i";
263      return false;
264    }
265  }
266
267  printOperand(MI, OpNo, O);
268  return false;
269}
270
271// At the moment, all inline asm memory operands are a single register.
272// In any case, the output of this routine should always be just one
273// assembler operand.
274
275bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
276                                          unsigned AsmVariant,
277                                          const char *ExtraCode,
278                                          raw_ostream &O) {
279  if (ExtraCode && ExtraCode[0]) {
280    if (ExtraCode[1] != 0) return true; // Unknown modifier.
281
282    switch (ExtraCode[0]) {
283    default: return true;  // Unknown modifier.
284    case 'y': // A memory reference for an X-form instruction
285      {
286        const char *RegName = "r0";
287        if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
288        O << RegName << ", ";
289        printOperand(MI, OpNo, O);
290        return false;
291      }
292    }
293  }
294
295  assert(MI->getOperand(OpNo).isReg());
296  O << "0(";
297  printOperand(MI, OpNo, O);
298  O << ")";
299  return false;
300}
301
302
303/// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
304/// exists for it.  If not, create one.  Then return a symbol that references
305/// the TOC entry.
306MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
307
308  MCSymbol *&TOCEntry = TOC[Sym];
309
310  // To avoid name clash check if the name already exists.
311  while (TOCEntry == 0) {
312    if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
313                                "C" + Twine(TOCLabelID++)) == 0) {
314      TOCEntry = GetTempSymbol("C", TOCLabelID);
315    }
316  }
317
318  return TOCEntry;
319}
320
321
322/// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
323/// the current output stream.
324///
325void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
326  MCInst TmpInst;
327
328  // Lower multi-instruction pseudo operations.
329  switch (MI->getOpcode()) {
330  default: break;
331  case TargetOpcode::DBG_VALUE:
332    llvm_unreachable("Should be handled target independently");
333  case PPC::MovePCtoLR:
334  case PPC::MovePCtoLR8: {
335    // Transform %LR = MovePCtoLR
336    // Into this, where the label is the PIC base:
337    //     bl L1$pb
338    // L1$pb:
339    MCSymbol *PICBase = MF->getPICBaseSymbol();
340
341    // Emit the 'bl'.
342    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL)
343      // FIXME: We would like an efficient form for this, so we don't have to do
344      // a lot of extra uniquing.
345      .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
346
347    // Emit the label.
348    OutStreamer.EmitLabel(PICBase);
349    return;
350  }
351  case PPC::LDtocJTI:
352  case PPC::LDtocCPT:
353  case PPC::LDtoc: {
354    // Transform %X3 = LDtoc <ga:@min1>, %X2
355    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
356
357    // Change the opcode to LD, and the global address operand to be a
358    // reference to the TOC entry we will synthesize later.
359    TmpInst.setOpcode(PPC::LD);
360    const MachineOperand &MO = MI->getOperand(1);
361
362    // Map symbol -> label of TOC entry
363    assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
364    MCSymbol *MOSymbol = 0;
365    if (MO.isGlobal())
366      MOSymbol = Mang->getSymbol(MO.getGlobal());
367    else if (MO.isCPI())
368      MOSymbol = GetCPISymbol(MO.getIndex());
369    else if (MO.isJTI())
370      MOSymbol = GetJTISymbol(MO.getIndex());
371
372    MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
373
374    const MCExpr *Exp =
375      MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
376                              OutContext);
377    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
378    OutStreamer.EmitInstruction(TmpInst);
379    return;
380  }
381
382  case PPC::ADDIStocHA: {
383    // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
384    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
385
386    // Change the opcode to ADDIS8.  If the global address is external,
387    // has common linkage, is a function address, or is a jump table
388    // address, then generate a TOC entry and reference that.  Otherwise
389    // reference the symbol directly.
390    TmpInst.setOpcode(PPC::ADDIS8);
391    const MachineOperand &MO = MI->getOperand(2);
392    assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
393           "Invalid operand for ADDIStocHA!");
394    MCSymbol *MOSymbol = 0;
395    bool IsExternal = false;
396    bool IsFunction = false;
397    bool IsCommon = false;
398    bool IsAvailExt = false;
399
400    if (MO.isGlobal()) {
401      const GlobalValue *GValue = MO.getGlobal();
402      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
403      const GlobalValue *RealGValue = GAlias ?
404        GAlias->resolveAliasedGlobal(false) : GValue;
405      MOSymbol = Mang->getSymbol(RealGValue);
406      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
407      IsExternal = GVar && !GVar->hasInitializer();
408      IsCommon = GVar && RealGValue->hasCommonLinkage();
409      IsFunction = !GVar;
410      IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage();
411    } else if (MO.isCPI())
412      MOSymbol = GetCPISymbol(MO.getIndex());
413    else if (MO.isJTI())
414      MOSymbol = GetJTISymbol(MO.getIndex());
415
416    if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI())
417      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
418
419    const MCExpr *Exp =
420      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
421                              OutContext);
422    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
423    OutStreamer.EmitInstruction(TmpInst);
424    return;
425  }
426  case PPC::LDtocL: {
427    // Transform %Xd = LDtocL <ga:@sym>, %Xs
428    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
429
430    // Change the opcode to LD.  If the global address is external, has
431    // common linkage, or is a jump table address, then reference the
432    // associated TOC entry.  Otherwise reference the symbol directly.
433    TmpInst.setOpcode(PPC::LD);
434    const MachineOperand &MO = MI->getOperand(1);
435    assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
436           "Invalid operand for LDtocL!");
437    MCSymbol *MOSymbol = 0;
438
439    if (MO.isJTI())
440      MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
441    else if (MO.isCPI())
442      MOSymbol = GetCPISymbol(MO.getIndex());
443    else if (MO.isGlobal()) {
444      const GlobalValue *GValue = MO.getGlobal();
445      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
446      const GlobalValue *RealGValue = GAlias ?
447        GAlias->resolveAliasedGlobal(false) : GValue;
448      MOSymbol = Mang->getSymbol(RealGValue);
449      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
450
451      if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
452          RealGValue->hasAvailableExternallyLinkage())
453        MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
454    }
455
456    const MCExpr *Exp =
457      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
458                              OutContext);
459    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
460    OutStreamer.EmitInstruction(TmpInst);
461    return;
462  }
463  case PPC::ADDItocL: {
464    // Transform %Xd = ADDItocL %Xs, <ga:@sym>
465    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
466
467    // Change the opcode to ADDI8.  If the global address is external, then
468    // generate a TOC entry and reference that.  Otherwise reference the
469    // symbol directly.
470    TmpInst.setOpcode(PPC::ADDI8);
471    const MachineOperand &MO = MI->getOperand(2);
472    assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
473    MCSymbol *MOSymbol = 0;
474    bool IsExternal = false;
475    bool IsFunction = false;
476
477    if (MO.isGlobal()) {
478      const GlobalValue *GValue = MO.getGlobal();
479      const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
480      const GlobalValue *RealGValue = GAlias ?
481        GAlias->resolveAliasedGlobal(false) : GValue;
482      MOSymbol = Mang->getSymbol(RealGValue);
483      const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
484      IsExternal = GVar && !GVar->hasInitializer();
485      IsFunction = !GVar;
486    } else if (MO.isCPI())
487      MOSymbol = GetCPISymbol(MO.getIndex());
488
489    if (IsFunction || IsExternal)
490      MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
491
492    const MCExpr *Exp =
493      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
494                              OutContext);
495    TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
496    OutStreamer.EmitInstruction(TmpInst);
497    return;
498  }
499  case PPC::ADDISgotTprelHA: {
500    // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
501    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
502    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
503    const MachineOperand &MO = MI->getOperand(2);
504    const GlobalValue *GValue = MO.getGlobal();
505    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
506    const MCExpr *SymGotTprel =
507      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
508                              OutContext);
509    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
510                                .addReg(MI->getOperand(0).getReg())
511                                .addReg(PPC::X2)
512                                .addExpr(SymGotTprel));
513    return;
514  }
515  case PPC::LDgotTprelL: {
516    // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
517    LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
518
519    // Change the opcode to LD.
520    TmpInst.setOpcode(PPC::LD);
521    const MachineOperand &MO = MI->getOperand(1);
522    const GlobalValue *GValue = MO.getGlobal();
523    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
524    const MCExpr *Exp =
525      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
526                              OutContext);
527    TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
528    OutStreamer.EmitInstruction(TmpInst);
529    return;
530  }
531  case PPC::ADDIStlsgdHA: {
532    // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
533    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
534    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
535    const MachineOperand &MO = MI->getOperand(2);
536    const GlobalValue *GValue = MO.getGlobal();
537    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
538    const MCExpr *SymGotTlsGD =
539      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
540                              OutContext);
541    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
542                                .addReg(MI->getOperand(0).getReg())
543                                .addReg(PPC::X2)
544                                .addExpr(SymGotTlsGD));
545    return;
546  }
547  case PPC::ADDItlsgdL: {
548    // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
549    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsgd@l
550    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
551    const MachineOperand &MO = MI->getOperand(2);
552    const GlobalValue *GValue = MO.getGlobal();
553    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
554    const MCExpr *SymGotTlsGD =
555      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
556                              OutContext);
557    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
558                                .addReg(MI->getOperand(0).getReg())
559                                .addReg(MI->getOperand(1).getReg())
560                                .addExpr(SymGotTlsGD));
561    return;
562  }
563  case PPC::GETtlsADDR: {
564    // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
565    // Into:      BL8_NOP_TLSGD __tls_get_addr(sym@tlsgd)
566    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
567
568    StringRef Name = "__tls_get_addr";
569    MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
570    const MCSymbolRefExpr *TlsRef =
571      MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
572    const MachineOperand &MO = MI->getOperand(2);
573    const GlobalValue *GValue = MO.getGlobal();
574    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
575    const MCExpr *SymVar =
576      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
577                              OutContext);
578    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSGD)
579                                .addExpr(TlsRef)
580                                .addExpr(SymVar));
581    return;
582  }
583  case PPC::ADDIStlsldHA: {
584    // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
585    // Into:      %Xd = ADDIS8 %X2, sym@got@tlsld@ha
586    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
587    const MachineOperand &MO = MI->getOperand(2);
588    const GlobalValue *GValue = MO.getGlobal();
589    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
590    const MCExpr *SymGotTlsLD =
591      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
592                              OutContext);
593    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
594                                .addReg(MI->getOperand(0).getReg())
595                                .addReg(PPC::X2)
596                                .addExpr(SymGotTlsLD));
597    return;
598  }
599  case PPC::ADDItlsldL: {
600    // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
601    // Into:      %Xd = ADDI8 %Xs, sym@got@tlsld@l
602    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
603    const MachineOperand &MO = MI->getOperand(2);
604    const GlobalValue *GValue = MO.getGlobal();
605    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
606    const MCExpr *SymGotTlsLD =
607      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
608                              OutContext);
609    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
610                                .addReg(MI->getOperand(0).getReg())
611                                .addReg(MI->getOperand(1).getReg())
612                                .addExpr(SymGotTlsLD));
613    return;
614  }
615  case PPC::GETtlsldADDR: {
616    // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
617    // Into:      BL8_NOP_TLSLD __tls_get_addr(sym@tlsld)
618    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
619
620    StringRef Name = "__tls_get_addr";
621    MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
622    const MCSymbolRefExpr *TlsRef =
623      MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
624    const MachineOperand &MO = MI->getOperand(2);
625    const GlobalValue *GValue = MO.getGlobal();
626    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
627    const MCExpr *SymVar =
628      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
629                              OutContext);
630    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLSLD)
631                                .addExpr(TlsRef)
632                                .addExpr(SymVar));
633    return;
634  }
635  case PPC::ADDISdtprelHA: {
636    // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
637    // Into:      %Xd = ADDIS8 %X3, sym@dtprel@ha
638    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
639    const MachineOperand &MO = MI->getOperand(2);
640    const GlobalValue *GValue = MO.getGlobal();
641    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
642    const MCExpr *SymDtprel =
643      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
644                              OutContext);
645    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
646                                .addReg(MI->getOperand(0).getReg())
647                                .addReg(PPC::X3)
648                                .addExpr(SymDtprel));
649    return;
650  }
651  case PPC::ADDIdtprelL: {
652    // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
653    // Into:      %Xd = ADDI8 %Xs, sym@dtprel@l
654    assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
655    const MachineOperand &MO = MI->getOperand(2);
656    const GlobalValue *GValue = MO.getGlobal();
657    MCSymbol *MOSymbol = Mang->getSymbol(GValue);
658    const MCExpr *SymDtprel =
659      MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
660                              OutContext);
661    OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
662                                .addReg(MI->getOperand(0).getReg())
663                                .addReg(MI->getOperand(1).getReg())
664                                .addExpr(SymDtprel));
665    return;
666  }
667  case PPC::MFCRpseud:
668  case PPC::MFCR8pseud:
669    // Transform: %R3 = MFCRpseud %CR7
670    // Into:      %R3 = MFCR      ;; cr7
671    OutStreamer.AddComment(PPCInstPrinter::
672                           getRegisterName(MI->getOperand(1).getReg()));
673    OutStreamer.EmitInstruction(MCInstBuilder(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR)
674      .addReg(MI->getOperand(0).getReg()));
675    return;
676  case PPC::SYNC:
677    // In Book E sync is called msync, handle this special case here...
678    if (Subtarget.isBookE()) {
679      OutStreamer.EmitRawText(StringRef("\tmsync"));
680      return;
681    }
682    break;
683  case PPC::LD:
684  case PPC::STD:
685  case PPC::LWA: {
686    // Verify alignment is legal, so we don't create relocations
687    // that can't be supported.
688    // FIXME:  This test is currently disabled for Darwin.  The test
689    // suite shows a handful of test cases that fail this check for
690    // Darwin.  Those need to be investigated before this sanity test
691    // can be enabled for those subtargets.
692    if (!Subtarget.isDarwin()) {
693      unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
694      const MachineOperand &MO = MI->getOperand(OpNum);
695      if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
696        llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
697    }
698    // Now process the instruction normally.
699    break;
700  }
701  }
702
703  LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
704  OutStreamer.EmitInstruction(TmpInst);
705}
706
707void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
708  if (!Subtarget.isPPC64())  // linux/ppc32 - Normal entry label.
709    return AsmPrinter::EmitFunctionEntryLabel();
710
711  // Emit an official procedure descriptor.
712  MCSectionSubPair Current = OutStreamer.getCurrentSection();
713  const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
714      ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
715      SectionKind::getReadOnly());
716  OutStreamer.SwitchSection(Section);
717  OutStreamer.EmitLabel(CurrentFnSym);
718  OutStreamer.EmitValueToAlignment(8);
719  MCSymbol *Symbol1 =
720    OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
721  // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
722  // entry point.
723  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
724			8 /*size*/);
725  MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
726  // Generates a R_PPC64_TOC relocation for TOC base insertion.
727  OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
728                        MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
729                        8/*size*/);
730  // Emit a null environment pointer.
731  OutStreamer.EmitIntValue(0, 8 /* size */);
732  OutStreamer.SwitchSection(Current.first, Current.second);
733
734  MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
735                          ".L." + Twine(CurrentFnSym->getName()));
736  OutStreamer.EmitLabel(RealFnSym);
737  CurrentFnSymForSize = RealFnSym;
738}
739
740
741bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
742  const DataLayout *TD = TM.getDataLayout();
743
744  bool isPPC64 = TD->getPointerSizeInBits() == 64;
745
746  if (isPPC64 && !TOC.empty()) {
747    const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
748        ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
749        SectionKind::getReadOnly());
750    OutStreamer.SwitchSection(Section);
751
752    for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
753         E = TOC.end(); I != E; ++I) {
754      OutStreamer.EmitLabel(I->second);
755      MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
756      OutStreamer.EmitTCEntry(*S);
757    }
758  }
759
760  MachineModuleInfoELF &MMIELF =
761    MMI->getObjFileInfo<MachineModuleInfoELF>();
762
763  MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
764  if (!Stubs.empty()) {
765    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
766    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
767      // L_foo$stub:
768      OutStreamer.EmitLabel(Stubs[i].first);
769      //   .long _foo
770      OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
771                                                    OutContext),
772                            isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
773    }
774
775    Stubs.clear();
776    OutStreamer.AddBlankLine();
777  }
778
779  return AsmPrinter::doFinalization(M);
780}
781
782/// EmitFunctionBodyEnd - Print the traceback table before the .size
783/// directive.
784///
785void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
786  // Only the 64-bit target requires a traceback table.  For now,
787  // we only emit the word of zeroes that GDB requires to find
788  // the end of the function, and zeroes for the eight-byte
789  // mandatory fields.
790  // FIXME: We should fill in the eight-byte mandatory fields as described in
791  // the PPC64 ELF ABI (this is a low-priority item because GDB does not
792  // currently make use of these fields).
793  if (Subtarget.isPPC64()) {
794    OutStreamer.EmitIntValue(0, 4/*size*/);
795    OutStreamer.EmitIntValue(0, 8/*size*/);
796  }
797}
798
799void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
800  static const char *const CPUDirectives[] = {
801    "",
802    "ppc",
803    "ppc440",
804    "ppc601",
805    "ppc602",
806    "ppc603",
807    "ppc7400",
808    "ppc750",
809    "ppc970",
810    "ppcA2",
811    "ppce500mc",
812    "ppce5500",
813    "power3",
814    "power4",
815    "power5",
816    "power5x",
817    "power6",
818    "power6x",
819    "power7",
820    "ppc64"
821  };
822
823  unsigned Directive = Subtarget.getDarwinDirective();
824  if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
825    Directive = PPC::DIR_970;
826  if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
827    Directive = PPC::DIR_7400;
828  if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
829    Directive = PPC::DIR_64;
830  assert(Directive <= PPC::DIR_64 && "Directive out of range.");
831
832  // FIXME: This is a total hack, finish mc'izing the PPC backend.
833  if (OutStreamer.hasRawTextSupport()) {
834    assert(Directive < sizeof(CPUDirectives) / sizeof(*CPUDirectives) &&
835           "CPUDirectives[] might not be up-to-date!");
836    OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
837  }
838
839  // Prime text sections so they are adjacent.  This reduces the likelihood a
840  // large data or debug section causes a branch to exceed 16M limit.
841  const TargetLoweringObjectFileMachO &TLOFMacho =
842    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
843  OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
844  if (TM.getRelocationModel() == Reloc::PIC_) {
845    OutStreamer.SwitchSection(
846           OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
847                                      MCSectionMachO::S_SYMBOL_STUBS |
848                                      MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
849                                      32, SectionKind::getText()));
850  } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
851    OutStreamer.SwitchSection(
852           OutContext.getMachOSection("__TEXT","__symbol_stub1",
853                                      MCSectionMachO::S_SYMBOL_STUBS |
854                                      MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
855                                      16, SectionKind::getText()));
856  }
857  OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
858}
859
860static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
861  // Remove $stub suffix, add $lazy_ptr.
862  StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
863  return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
864}
865
866static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
867  // Add $tmp suffix to $stub, yielding $stub$tmp.
868  return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
869}
870
871void PPCDarwinAsmPrinter::
872EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
873  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
874
875  const TargetLoweringObjectFileMachO &TLOFMacho =
876    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
877
878  // .lazy_symbol_pointer
879  const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
880
881  // Output stubs for dynamically-linked functions
882  if (TM.getRelocationModel() == Reloc::PIC_) {
883    const MCSection *StubSection =
884    OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
885                               MCSectionMachO::S_SYMBOL_STUBS |
886                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
887                               32, SectionKind::getText());
888    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
889      OutStreamer.SwitchSection(StubSection);
890      EmitAlignment(4);
891
892      MCSymbol *Stub = Stubs[i].first;
893      MCSymbol *RawSym = Stubs[i].second.getPointer();
894      MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
895      MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
896
897      OutStreamer.EmitLabel(Stub);
898      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
899
900      const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
901      const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
902      const MCExpr *Sub =
903        MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
904
905      // mflr r0
906      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
907      // bcl 20, 31, AnonSymbol
908      OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCLalways).addExpr(Anon));
909      OutStreamer.EmitLabel(AnonSymbol);
910      // mflr r11
911      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
912      // addis r11, r11, ha16(LazyPtr - AnonSymbol)
913      const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, OutContext);
914      OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
915        .addReg(PPC::R11)
916        .addReg(PPC::R11)
917        .addExpr(SubHa16));
918      // mtlr r0
919      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
920
921      // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
922      // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
923      const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, OutContext);
924      OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
925        .addReg(PPC::R12)
926        .addExpr(SubLo16).addExpr(SubLo16)
927        .addReg(PPC::R11));
928      // mtctr r12
929      OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
930      // bctr
931      OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
932
933      OutStreamer.SwitchSection(LSPSection);
934      OutStreamer.EmitLabel(LazyPtr);
935      OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
936
937      MCSymbol *DyldStubBindingHelper =
938        OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
939      if (isPPC64) {
940        // .quad dyld_stub_binding_helper
941        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
942      } else {
943        // .long dyld_stub_binding_helper
944        OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
945      }
946    }
947    OutStreamer.AddBlankLine();
948    return;
949  }
950
951  const MCSection *StubSection =
952    OutContext.getMachOSection("__TEXT","__symbol_stub1",
953                               MCSectionMachO::S_SYMBOL_STUBS |
954                               MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
955                               16, SectionKind::getText());
956  for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
957    MCSymbol *Stub = Stubs[i].first;
958    MCSymbol *RawSym = Stubs[i].second.getPointer();
959    MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
960    const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
961
962    OutStreamer.SwitchSection(StubSection);
963    EmitAlignment(4);
964    OutStreamer.EmitLabel(Stub);
965    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
966
967    // lis r11, ha16(LazyPtr)
968    const MCExpr *LazyPtrHa16 = PPCMCExpr::CreateHa(LazyPtrExpr, OutContext);
969    OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
970      .addReg(PPC::R11)
971      .addExpr(LazyPtrHa16));
972
973    // ldu r12, lo16(LazyPtr)(r11)
974    // lwzu r12, lo16(LazyPtr)(r11)
975    const MCExpr *LazyPtrLo16 = PPCMCExpr::CreateLo(LazyPtrExpr, OutContext);
976    OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
977      .addReg(PPC::R12)
978      .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
979      .addReg(PPC::R11));
980
981    // mtctr r12
982    OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
983    // bctr
984    OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
985
986    OutStreamer.SwitchSection(LSPSection);
987    OutStreamer.EmitLabel(LazyPtr);
988    OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
989
990    MCSymbol *DyldStubBindingHelper =
991      OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
992    if (isPPC64) {
993      // .quad dyld_stub_binding_helper
994      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
995    } else {
996      // .long dyld_stub_binding_helper
997      OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
998    }
999  }
1000
1001  OutStreamer.AddBlankLine();
1002}
1003
1004
1005bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1006  bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1007
1008  // Darwin/PPC always uses mach-o.
1009  const TargetLoweringObjectFileMachO &TLOFMacho =
1010    static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1011  MachineModuleInfoMachO &MMIMacho =
1012    MMI->getObjFileInfo<MachineModuleInfoMachO>();
1013
1014  MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1015  if (!Stubs.empty())
1016    EmitFunctionStubs(Stubs);
1017
1018  if (MAI->doesSupportExceptionHandling() && MMI) {
1019    // Add the (possibly multiple) personalities to the set of global values.
1020    // Only referenced functions get into the Personalities list.
1021    const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1022    for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1023         E = Personalities.end(); I != E; ++I) {
1024      if (*I) {
1025        MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1026        MachineModuleInfoImpl::StubValueTy &StubSym =
1027          MMIMacho.getGVStubEntry(NLPSym);
1028        StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1029      }
1030    }
1031  }
1032
1033  // Output stubs for dynamically-linked functions.
1034  Stubs = MMIMacho.GetGVStubList();
1035
1036  // Output macho stubs for external and common global variables.
1037  if (!Stubs.empty()) {
1038    // Switch with ".non_lazy_symbol_pointer" directive.
1039    OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1040    EmitAlignment(isPPC64 ? 3 : 2);
1041
1042    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1043      // L_foo$stub:
1044      OutStreamer.EmitLabel(Stubs[i].first);
1045      //   .indirect_symbol _foo
1046      MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1047      OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1048
1049      if (MCSym.getInt())
1050        // External to current translation unit.
1051        OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1052      else
1053        // Internal to current translation unit.
1054        //
1055        // When we place the LSDA into the TEXT section, the type info pointers
1056        // need to be indirect and pc-rel. We accomplish this by using NLPs.
1057        // However, sometimes the types are local to the file. So we need to
1058        // fill in the value for the NLP in those cases.
1059        OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1060                                                      OutContext),
1061                              isPPC64 ? 8 : 4/*size*/);
1062    }
1063
1064    Stubs.clear();
1065    OutStreamer.AddBlankLine();
1066  }
1067
1068  Stubs = MMIMacho.GetHiddenGVStubList();
1069  if (!Stubs.empty()) {
1070    OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1071    EmitAlignment(isPPC64 ? 3 : 2);
1072
1073    for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1074      // L_foo$stub:
1075      OutStreamer.EmitLabel(Stubs[i].first);
1076      //   .long _foo
1077      OutStreamer.EmitValue(MCSymbolRefExpr::
1078                            Create(Stubs[i].second.getPointer(),
1079                                   OutContext),
1080                            isPPC64 ? 8 : 4/*size*/);
1081    }
1082
1083    Stubs.clear();
1084    OutStreamer.AddBlankLine();
1085  }
1086
1087  // Funny Darwin hack: This flag tells the linker that no global symbols
1088  // contain code that falls through to other global symbols (e.g. the obvious
1089  // implementation of multiple entry points).  If this doesn't occur, the
1090  // linker can safely perform dead code stripping.  Since LLVM never generates
1091  // code that does this, it is always safe to set.
1092  OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1093
1094  return AsmPrinter::doFinalization(M);
1095}
1096
1097/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1098/// for a MachineFunction to the given output stream, in a format that the
1099/// Darwin assembler can deal with.
1100///
1101static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1102                                           MCStreamer &Streamer) {
1103  const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1104
1105  if (Subtarget->isDarwin())
1106    return new PPCDarwinAsmPrinter(tm, Streamer);
1107  return new PPCLinuxAsmPrinter(tm, Streamer);
1108}
1109
1110// Force static initialization.
1111extern "C" void LLVMInitializePowerPCAsmPrinter() {
1112  TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1113  TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1114}
1115