1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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'.
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
17 //===----------------------------------------------------------------------===//
19 #define DEBUG_TYPE "asmprinter"
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"
63 class PPCAsmPrinter : public AsmPrinter {
65 MapVector<MCSymbol*, MCSymbol*> TOC;
66 const PPCSubtarget &Subtarget;
69 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
70 : AsmPrinter(TM, Streamer),
71 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
73 virtual const char *getPassName() const {
74 return "PowerPC Assembly Printer";
77 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
79 virtual void EmitInstruction(const MachineInstr *MI);
81 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
83 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
84 unsigned AsmVariant, const char *ExtraCode,
86 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
87 unsigned AsmVariant, const char *ExtraCode,
91 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
92 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
94 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
95 : PPCAsmPrinter(TM, Streamer) {}
97 virtual const char *getPassName() const {
98 return "Linux PPC Assembly Printer";
101 bool doFinalization(Module &M);
103 virtual void EmitFunctionEntryLabel();
105 void EmitFunctionBodyEnd();
108 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
110 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
112 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
113 : PPCAsmPrinter(TM, Streamer) {}
115 virtual const char *getPassName() const {
116 return "Darwin PPC Assembly Printer";
119 bool doFinalization(Module &M);
120 void EmitStartOfAsmFile(Module &M);
122 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
124 } // end of anonymous namespace
126 /// stripRegisterPrefix - This method strips the character prefix from a
127 /// register name so that only the number is left. Used by for linux asm.
128 static const char *stripRegisterPrefix(const char *RegName) {
129 switch (RegName[0]) {
132 case 'v': return RegName + 1;
133 case 'c': if (RegName[1] == 'r') return RegName + 2;
139 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
141 const MachineOperand &MO = MI->getOperand(OpNo);
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);
152 case MachineOperand::MO_Immediate:
156 case MachineOperand::MO_MachineBasicBlock:
157 O << *MO.getMBB()->getSymbol();
159 case MachineOperand::MO_JumpTableIndex:
160 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
161 << '_' << MO.getIndex();
162 // FIXME: PIC relocation model
164 case MachineOperand::MO_ConstantPoolIndex:
165 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166 << '_' << MO.getIndex();
168 case MachineOperand::MO_BlockAddress:
169 O << *GetBlockAddressSymbol(MO.getBlockAddress());
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());
179 OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
180 MO.getSymbolName()+"$non_lazy_ptr");
181 MachineModuleInfoImpl::StubValueTy &StubSym =
182 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
183 if (StubSym.getPointer() == 0)
184 StubSym = MachineModuleInfoImpl::
185 StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
190 case MachineOperand::MO_GlobalAddress: {
191 // Computing the address of a global symbol, not calling it.
192 const GlobalValue *GV = MO.getGlobal();
193 MCSymbol *SymToPrint;
195 // External or weakly linked global variables need non-lazily-resolved stubs
196 if (TM.getRelocationModel() != Reloc::Static &&
197 (GV->isDeclaration() || GV->isWeakForLinker())) {
198 if (!GV->hasHiddenVisibility()) {
199 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$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, "$non_lazy_ptr");
210 MachineModuleInfoImpl::StubValueTy &StubSym =
211 MMI->getObjFileInfo<MachineModuleInfoMachO>().
212 getHiddenGVStubEntry(SymToPrint);
213 if (StubSym.getPointer() == 0)
214 StubSym = MachineModuleInfoImpl::
215 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
217 SymToPrint = Mang->getSymbol(GV);
220 SymToPrint = Mang->getSymbol(GV);
225 printOffset(MO.getOffset(), O);
230 O << "<unknown operand type: " << MO.getType() << ">";
235 /// PrintAsmOperand - Print out an operand for an inline asm expression.
237 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
239 const char *ExtraCode, raw_ostream &O) {
240 // Does this asm operand have a single letter operand modifier?
241 if (ExtraCode && ExtraCode[0]) {
242 if (ExtraCode[1] != 0) return true; // Unknown modifier.
244 switch (ExtraCode[0]) {
246 // See if this is a generic print operand
247 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248 case 'c': // Don't print "$" 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())
256 ++OpNo; // Return the high-part.
259 // Write 'i' if an integer constant, otherwise nothing. Used to print
261 if (MI->getOperand(OpNo).isImm())
267 printOperand(MI, OpNo, O);
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.
275 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
277 const char *ExtraCode,
279 if (ExtraCode && ExtraCode[0]) {
280 if (ExtraCode[1] != 0) return true; // Unknown modifier.
282 switch (ExtraCode[0]) {
283 default: return true; // Unknown modifier.
284 case 'y': // A memory reference for an X-form instruction
286 const char *RegName = "r0";
287 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
288 O << RegName << ", ";
289 printOperand(MI, OpNo, O);
295 assert(MI->getOperand(OpNo).isReg());
297 printOperand(MI, OpNo, O);
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
306 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
308 MCSymbol *&TOCEntry = TOC[Sym];
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);
322 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
323 /// the current output stream.
325 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
328 // Lower multi-instruction pseudo operations.
329 switch (MI->getOpcode()) {
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:
339 MCSymbol *PICBase = MF->getPICBaseSymbol();
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)));
348 OutStreamer.EmitLabel(PICBase);
354 // Transform %X3 = LDtoc <ga:@min1>, %X2
355 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
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);
362 // Map symbol -> label of TOC entry
363 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
364 MCSymbol *MOSymbol = 0;
366 MOSymbol = Mang->getSymbol(MO.getGlobal());
368 MOSymbol = GetCPISymbol(MO.getIndex());
370 MOSymbol = GetJTISymbol(MO.getIndex());
372 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
375 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
377 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
378 OutStreamer.EmitInstruction(TmpInst);
382 case PPC::ADDIStocHA: {
383 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
384 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
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;
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();
410 IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage();
411 } else if (MO.isCPI())
412 MOSymbol = GetCPISymbol(MO.getIndex());
414 MOSymbol = GetJTISymbol(MO.getIndex());
416 if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI() ||
417 TM.getCodeModel() == CodeModel::Large)
418 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
421 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
423 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
424 OutStreamer.EmitInstruction(TmpInst);
428 // Transform %Xd = LDtocL <ga:@sym>, %Xs
429 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
431 // Change the opcode to LD. If the global address is external, has
432 // common linkage, or is a jump table address, then reference the
433 // associated TOC entry. Otherwise reference the symbol directly.
434 TmpInst.setOpcode(PPC::LD);
435 const MachineOperand &MO = MI->getOperand(1);
436 assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
437 "Invalid operand for LDtocL!");
438 MCSymbol *MOSymbol = 0;
441 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
442 else if (MO.isCPI()) {
443 MOSymbol = GetCPISymbol(MO.getIndex());
444 if (TM.getCodeModel() == CodeModel::Large)
445 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
447 else if (MO.isGlobal()) {
448 const GlobalValue *GValue = MO.getGlobal();
449 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
450 const GlobalValue *RealGValue = GAlias ?
451 GAlias->resolveAliasedGlobal(false) : GValue;
452 MOSymbol = Mang->getSymbol(RealGValue);
453 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
455 if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
456 RealGValue->hasAvailableExternallyLinkage() ||
457 TM.getCodeModel() == CodeModel::Large)
458 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
462 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
464 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
465 OutStreamer.EmitInstruction(TmpInst);
468 case PPC::ADDItocL: {
469 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
470 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
472 // Change the opcode to ADDI8. If the global address is external, then
473 // generate a TOC entry and reference that. Otherwise reference the
475 TmpInst.setOpcode(PPC::ADDI8);
476 const MachineOperand &MO = MI->getOperand(2);
477 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
478 MCSymbol *MOSymbol = 0;
479 bool IsExternal = false;
480 bool IsFunction = false;
483 const GlobalValue *GValue = MO.getGlobal();
484 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
485 const GlobalValue *RealGValue = GAlias ?
486 GAlias->resolveAliasedGlobal(false) : GValue;
487 MOSymbol = Mang->getSymbol(RealGValue);
488 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
489 IsExternal = GVar && !GVar->hasInitializer();
491 } else if (MO.isCPI())
492 MOSymbol = GetCPISymbol(MO.getIndex());
494 if (IsFunction || IsExternal || TM.getCodeModel() == CodeModel::Large)
495 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
498 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
500 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
501 OutStreamer.EmitInstruction(TmpInst);
504 case PPC::ADDISgotTprelHA: {
505 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
506 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
507 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
508 const MachineOperand &MO = MI->getOperand(2);
509 const GlobalValue *GValue = MO.getGlobal();
510 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
511 const MCExpr *SymGotTprel =
512 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
514 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
515 .addReg(MI->getOperand(0).getReg())
517 .addExpr(SymGotTprel));
520 case PPC::LDgotTprelL: {
521 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
522 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
524 // Change the opcode to LD.
525 TmpInst.setOpcode(PPC::LD);
526 const MachineOperand &MO = MI->getOperand(1);
527 const GlobalValue *GValue = MO.getGlobal();
528 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
530 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
532 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
533 OutStreamer.EmitInstruction(TmpInst);
536 case PPC::ADDIStlsgdHA: {
537 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
538 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
539 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
540 const MachineOperand &MO = MI->getOperand(2);
541 const GlobalValue *GValue = MO.getGlobal();
542 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
543 const MCExpr *SymGotTlsGD =
544 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
546 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
547 .addReg(MI->getOperand(0).getReg())
549 .addExpr(SymGotTlsGD));
552 case PPC::ADDItlsgdL: {
553 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
554 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
555 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
556 const MachineOperand &MO = MI->getOperand(2);
557 const GlobalValue *GValue = MO.getGlobal();
558 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
559 const MCExpr *SymGotTlsGD =
560 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
562 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
563 .addReg(MI->getOperand(0).getReg())
564 .addReg(MI->getOperand(1).getReg())
565 .addExpr(SymGotTlsGD));
568 case PPC::GETtlsADDR: {
569 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
570 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
571 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
573 StringRef Name = "__tls_get_addr";
574 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
575 const MCSymbolRefExpr *TlsRef =
576 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
577 const MachineOperand &MO = MI->getOperand(2);
578 const GlobalValue *GValue = MO.getGlobal();
579 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
580 const MCExpr *SymVar =
581 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
583 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLS)
588 case PPC::ADDIStlsldHA: {
589 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
590 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
591 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
592 const MachineOperand &MO = MI->getOperand(2);
593 const GlobalValue *GValue = MO.getGlobal();
594 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
595 const MCExpr *SymGotTlsLD =
596 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
598 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
599 .addReg(MI->getOperand(0).getReg())
601 .addExpr(SymGotTlsLD));
604 case PPC::ADDItlsldL: {
605 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
606 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
607 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
608 const MachineOperand &MO = MI->getOperand(2);
609 const GlobalValue *GValue = MO.getGlobal();
610 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
611 const MCExpr *SymGotTlsLD =
612 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
614 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
615 .addReg(MI->getOperand(0).getReg())
616 .addReg(MI->getOperand(1).getReg())
617 .addExpr(SymGotTlsLD));
620 case PPC::GETtlsldADDR: {
621 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
622 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
623 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
625 StringRef Name = "__tls_get_addr";
626 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
627 const MCSymbolRefExpr *TlsRef =
628 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
629 const MachineOperand &MO = MI->getOperand(2);
630 const GlobalValue *GValue = MO.getGlobal();
631 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
632 const MCExpr *SymVar =
633 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
635 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_TLS)
640 case PPC::ADDISdtprelHA: {
641 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
642 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
643 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
644 const MachineOperand &MO = MI->getOperand(2);
645 const GlobalValue *GValue = MO.getGlobal();
646 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
647 const MCExpr *SymDtprel =
648 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
650 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8)
651 .addReg(MI->getOperand(0).getReg())
653 .addExpr(SymDtprel));
656 case PPC::ADDIdtprelL: {
657 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
658 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
659 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
660 const MachineOperand &MO = MI->getOperand(2);
661 const GlobalValue *GValue = MO.getGlobal();
662 MCSymbol *MOSymbol = Mang->getSymbol(GValue);
663 const MCExpr *SymDtprel =
664 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
666 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8)
667 .addReg(MI->getOperand(0).getReg())
668 .addReg(MI->getOperand(1).getReg())
669 .addExpr(SymDtprel));
674 if (!Subtarget.hasMFOCRF()) {
675 // Transform: %R3 = MFOCRF %CR7
676 // Into: %R3 = MFCR ;; cr7
678 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
679 OutStreamer.AddComment(PPCInstPrinter::
680 getRegisterName(MI->getOperand(1).getReg()));
681 OutStreamer.EmitInstruction(MCInstBuilder(NewOpcode)
682 .addReg(MI->getOperand(0).getReg()));
688 if (!Subtarget.hasMFOCRF()) {
689 // Transform: %CR7 = MTOCRF %R3
690 // Into: MTCRF mask, %R3 ;; cr7
692 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
693 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
694 ->getEncodingValue(MI->getOperand(0).getReg());
695 OutStreamer.AddComment(PPCInstPrinter::
696 getRegisterName(MI->getOperand(0).getReg()));
697 OutStreamer.EmitInstruction(MCInstBuilder(NewOpcode)
699 .addReg(MI->getOperand(1).getReg()));
704 // In Book E sync is called msync, handle this special case here...
705 if (Subtarget.isBookE()) {
706 OutStreamer.EmitRawText(StringRef("\tmsync"));
714 // Verify alignment is legal, so we don't create relocations
715 // that can't be supported.
716 // FIXME: This test is currently disabled for Darwin. The test
717 // suite shows a handful of test cases that fail this check for
718 // Darwin. Those need to be investigated before this sanity test
719 // can be enabled for those subtargets.
720 if (!Subtarget.isDarwin()) {
721 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
722 const MachineOperand &MO = MI->getOperand(OpNum);
723 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
724 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
726 // Now process the instruction normally.
731 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
732 OutStreamer.EmitInstruction(TmpInst);
735 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
736 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
737 return AsmPrinter::EmitFunctionEntryLabel();
739 // Emit an official procedure descriptor.
740 MCSectionSubPair Current = OutStreamer.getCurrentSection();
741 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
742 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
743 SectionKind::getReadOnly());
744 OutStreamer.SwitchSection(Section);
745 OutStreamer.EmitLabel(CurrentFnSym);
746 OutStreamer.EmitValueToAlignment(8);
748 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
749 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
751 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
753 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
754 // Generates a R_PPC64_TOC relocation for TOC base insertion.
755 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
756 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
758 // Emit a null environment pointer.
759 OutStreamer.EmitIntValue(0, 8 /* size */);
760 OutStreamer.SwitchSection(Current.first, Current.second);
762 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
763 ".L." + Twine(CurrentFnSym->getName()));
764 OutStreamer.EmitLabel(RealFnSym);
765 CurrentFnSymForSize = RealFnSym;
769 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
770 const DataLayout *TD = TM.getDataLayout();
772 bool isPPC64 = TD->getPointerSizeInBits() == 64;
774 if (isPPC64 && !TOC.empty()) {
775 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
776 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
777 SectionKind::getReadOnly());
778 OutStreamer.SwitchSection(Section);
780 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
781 E = TOC.end(); I != E; ++I) {
782 OutStreamer.EmitLabel(I->second);
783 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
784 OutStreamer.EmitTCEntry(*S);
788 MachineModuleInfoELF &MMIELF =
789 MMI->getObjFileInfo<MachineModuleInfoELF>();
791 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
792 if (!Stubs.empty()) {
793 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
794 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
796 OutStreamer.EmitLabel(Stubs[i].first);
798 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
800 isPPC64 ? 8 : 4/*size*/);
804 OutStreamer.AddBlankLine();
807 return AsmPrinter::doFinalization(M);
810 /// EmitFunctionBodyEnd - Print the traceback table before the .size
813 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
814 // Only the 64-bit target requires a traceback table. For now,
815 // we only emit the word of zeroes that GDB requires to find
816 // the end of the function, and zeroes for the eight-byte
818 // FIXME: We should fill in the eight-byte mandatory fields as described in
819 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
820 // currently make use of these fields).
821 if (Subtarget.isPPC64()) {
822 OutStreamer.EmitIntValue(0, 4/*size*/);
823 OutStreamer.EmitIntValue(0, 8/*size*/);
827 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
828 static const char *const CPUDirectives[] = {
852 unsigned Directive = Subtarget.getDarwinDirective();
853 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
854 Directive = PPC::DIR_970;
855 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
856 Directive = PPC::DIR_7400;
857 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
858 Directive = PPC::DIR_64;
859 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
861 // FIXME: This is a total hack, finish mc'izing the PPC backend.
862 if (OutStreamer.hasRawTextSupport()) {
863 assert(Directive < array_lengthof(CPUDirectives) &&
864 "CPUDirectives[] might not be up-to-date!");
865 OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
868 // Prime text sections so they are adjacent. This reduces the likelihood a
869 // large data or debug section causes a branch to exceed 16M limit.
870 const TargetLoweringObjectFileMachO &TLOFMacho =
871 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
872 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
873 if (TM.getRelocationModel() == Reloc::PIC_) {
874 OutStreamer.SwitchSection(
875 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
876 MCSectionMachO::S_SYMBOL_STUBS |
877 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
878 32, SectionKind::getText()));
879 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
880 OutStreamer.SwitchSection(
881 OutContext.getMachOSection("__TEXT","__symbol_stub1",
882 MCSectionMachO::S_SYMBOL_STUBS |
883 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
884 16, SectionKind::getText()));
886 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
889 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
890 // Remove $stub suffix, add $lazy_ptr.
891 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
892 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
895 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
896 // Add $tmp suffix to $stub, yielding $stub$tmp.
897 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
900 void PPCDarwinAsmPrinter::
901 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
902 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
903 bool isDarwin = Subtarget.isDarwin();
905 const TargetLoweringObjectFileMachO &TLOFMacho =
906 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
908 // .lazy_symbol_pointer
909 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
911 // Output stubs for dynamically-linked functions
912 if (TM.getRelocationModel() == Reloc::PIC_) {
913 const MCSection *StubSection =
914 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
915 MCSectionMachO::S_SYMBOL_STUBS |
916 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
917 32, SectionKind::getText());
918 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
919 OutStreamer.SwitchSection(StubSection);
922 MCSymbol *Stub = Stubs[i].first;
923 MCSymbol *RawSym = Stubs[i].second.getPointer();
924 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
925 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
927 OutStreamer.EmitLabel(Stub);
928 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
930 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
931 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
933 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
936 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
937 // bcl 20, 31, AnonSymbol
938 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCLalways).addExpr(Anon));
939 OutStreamer.EmitLabel(AnonSymbol);
941 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
942 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
943 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
944 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
949 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
951 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
952 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
953 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
954 OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
956 .addExpr(SubLo16).addExpr(SubLo16)
959 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
961 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
963 OutStreamer.SwitchSection(LSPSection);
964 OutStreamer.EmitLabel(LazyPtr);
965 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
967 MCSymbol *DyldStubBindingHelper =
968 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
970 // .quad dyld_stub_binding_helper
971 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
973 // .long dyld_stub_binding_helper
974 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
977 OutStreamer.AddBlankLine();
981 const MCSection *StubSection =
982 OutContext.getMachOSection("__TEXT","__symbol_stub1",
983 MCSectionMachO::S_SYMBOL_STUBS |
984 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
985 16, SectionKind::getText());
986 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
987 MCSymbol *Stub = Stubs[i].first;
988 MCSymbol *RawSym = Stubs[i].second.getPointer();
989 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
990 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
992 OutStreamer.SwitchSection(StubSection);
994 OutStreamer.EmitLabel(Stub);
995 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
997 // lis r11, ha16(LazyPtr)
998 const MCExpr *LazyPtrHa16 =
999 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1000 OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
1002 .addExpr(LazyPtrHa16));
1004 // ldu r12, lo16(LazyPtr)(r11)
1005 // lwzu r12, lo16(LazyPtr)(r11)
1006 const MCExpr *LazyPtrLo16 =
1007 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1008 OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1010 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1014 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1016 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR));
1018 OutStreamer.SwitchSection(LSPSection);
1019 OutStreamer.EmitLabel(LazyPtr);
1020 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1022 MCSymbol *DyldStubBindingHelper =
1023 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1025 // .quad dyld_stub_binding_helper
1026 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1028 // .long dyld_stub_binding_helper
1029 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1033 OutStreamer.AddBlankLine();
1037 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1038 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1040 // Darwin/PPC always uses mach-o.
1041 const TargetLoweringObjectFileMachO &TLOFMacho =
1042 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1043 MachineModuleInfoMachO &MMIMacho =
1044 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1046 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1048 EmitFunctionStubs(Stubs);
1050 if (MAI->doesSupportExceptionHandling() && MMI) {
1051 // Add the (possibly multiple) personalities to the set of global values.
1052 // Only referenced functions get into the Personalities list.
1053 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1054 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1055 E = Personalities.end(); I != E; ++I) {
1057 MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1058 MachineModuleInfoImpl::StubValueTy &StubSym =
1059 MMIMacho.getGVStubEntry(NLPSym);
1060 StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
1065 // Output stubs for dynamically-linked functions.
1066 Stubs = MMIMacho.GetGVStubList();
1068 // Output macho stubs for external and common global variables.
1069 if (!Stubs.empty()) {
1070 // Switch with ".non_lazy_symbol_pointer" directive.
1071 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1072 EmitAlignment(isPPC64 ? 3 : 2);
1074 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1076 OutStreamer.EmitLabel(Stubs[i].first);
1077 // .indirect_symbol _foo
1078 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1079 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1082 // External to current translation unit.
1083 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1085 // Internal to current translation unit.
1087 // When we place the LSDA into the TEXT section, the type info pointers
1088 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1089 // However, sometimes the types are local to the file. So we need to
1090 // fill in the value for the NLP in those cases.
1091 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1093 isPPC64 ? 8 : 4/*size*/);
1097 OutStreamer.AddBlankLine();
1100 Stubs = MMIMacho.GetHiddenGVStubList();
1101 if (!Stubs.empty()) {
1102 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1103 EmitAlignment(isPPC64 ? 3 : 2);
1105 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1107 OutStreamer.EmitLabel(Stubs[i].first);
1109 OutStreamer.EmitValue(MCSymbolRefExpr::
1110 Create(Stubs[i].second.getPointer(),
1112 isPPC64 ? 8 : 4/*size*/);
1116 OutStreamer.AddBlankLine();
1119 // Funny Darwin hack: This flag tells the linker that no global symbols
1120 // contain code that falls through to other global symbols (e.g. the obvious
1121 // implementation of multiple entry points). If this doesn't occur, the
1122 // linker can safely perform dead code stripping. Since LLVM never generates
1123 // code that does this, it is always safe to set.
1124 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1126 return AsmPrinter::doFinalization(M);
1129 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1130 /// for a MachineFunction to the given output stream, in a format that the
1131 /// Darwin assembler can deal with.
1133 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1134 MCStreamer &Streamer) {
1135 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1137 if (Subtarget->isDarwin())
1138 return new PPCDarwinAsmPrinter(tm, Streamer);
1139 return new PPCLinuxAsmPrinter(tm, Streamer);
1142 // Force static initialization.
1143 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1144 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1145 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);