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 //===----------------------------------------------------------------------===//
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCSubtarget.h"
24 #include "PPCTargetMachine.h"
25 #include "PPCTargetStreamer.h"
26 #include "llvm/ADT/MapVector.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/StringExtras.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/IR/Constants.h"
36 #include "llvm/IR/DebugInfo.h"
37 #include "llvm/IR/DerivedTypes.h"
38 #include "llvm/IR/Mangler.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/TargetInstrInfo.h"
57 #include "llvm/Target/TargetOptions.h"
58 #include "llvm/Target/TargetRegisterInfo.h"
61 #define DEBUG_TYPE "asmprinter"
64 class PPCAsmPrinter : public AsmPrinter {
66 MapVector<MCSymbol*, MCSymbol*> TOC;
67 const PPCSubtarget &Subtarget;
70 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
71 : AsmPrinter(TM, Streamer),
72 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
74 const char *getPassName() const override {
75 return "PowerPC Assembly Printer";
78 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
80 void EmitInstruction(const MachineInstr *MI) override;
82 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
84 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
85 unsigned AsmVariant, const char *ExtraCode,
86 raw_ostream &O) override;
87 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
88 unsigned AsmVariant, const char *ExtraCode,
89 raw_ostream &O) override;
92 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
93 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
95 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
96 : PPCAsmPrinter(TM, Streamer) {}
98 const char *getPassName() const override {
99 return "Linux PPC Assembly Printer";
102 bool doFinalization(Module &M) override;
104 void EmitFunctionEntryLabel() override;
106 void EmitFunctionBodyEnd() override;
109 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
111 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
113 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
114 : PPCAsmPrinter(TM, Streamer) {}
116 const char *getPassName() const override {
117 return "Darwin PPC Assembly Printer";
120 bool doFinalization(Module &M) override;
121 void EmitStartOfAsmFile(Module &M) override;
123 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
125 } // end of anonymous namespace
127 /// stripRegisterPrefix - This method strips the character prefix from a
128 /// register name so that only the number is left. Used by for linux asm.
129 static const char *stripRegisterPrefix(const char *RegName) {
130 switch (RegName[0]) {
134 if (RegName[1] == 's')
137 case 'c': if (RegName[1] == 'r') return RegName + 2;
143 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
145 const DataLayout *DL = TM.getDataLayout();
146 const MachineOperand &MO = MI->getOperand(OpNo);
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);
157 case MachineOperand::MO_Immediate:
161 case MachineOperand::MO_MachineBasicBlock:
162 O << *MO.getMBB()->getSymbol();
164 case MachineOperand::MO_ConstantPoolIndex:
165 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166 << '_' << MO.getIndex();
168 case MachineOperand::MO_BlockAddress:
169 O << *GetBlockAddressSymbol(MO.getBlockAddress());
171 case MachineOperand::MO_GlobalAddress: {
172 // Computing the address of a global symbol, not calling it.
173 const GlobalValue *GV = MO.getGlobal();
174 MCSymbol *SymToPrint;
176 // External or weakly linked global variables need non-lazily-resolved stubs
177 if (TM.getRelocationModel() != Reloc::Static &&
178 (GV->isDeclaration() || GV->isWeakForLinker())) {
179 if (!GV->hasHiddenVisibility()) {
180 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
181 MachineModuleInfoImpl::StubValueTy &StubSym =
182 MMI->getObjFileInfo<MachineModuleInfoMachO>()
183 .getGVStubEntry(SymToPrint);
184 if (!StubSym.getPointer())
185 StubSym = MachineModuleInfoImpl::
186 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
187 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
188 GV->hasAvailableExternallyLinkage()) {
189 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
191 MachineModuleInfoImpl::StubValueTy &StubSym =
192 MMI->getObjFileInfo<MachineModuleInfoMachO>().
193 getHiddenGVStubEntry(SymToPrint);
194 if (!StubSym.getPointer())
195 StubSym = MachineModuleInfoImpl::
196 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
198 SymToPrint = getSymbol(GV);
201 SymToPrint = getSymbol(GV);
206 printOffset(MO.getOffset(), O);
211 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
216 /// PrintAsmOperand - Print out an operand for an inline asm expression.
218 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
220 const char *ExtraCode, raw_ostream &O) {
221 // Does this asm operand have a single letter operand modifier?
222 if (ExtraCode && ExtraCode[0]) {
223 if (ExtraCode[1] != 0) return true; // Unknown modifier.
225 switch (ExtraCode[0]) {
227 // See if this is a generic print operand
228 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
229 case 'c': // Don't print "$" before a global var name or constant.
230 break; // PPC never has a prefix.
231 case 'L': // Write second word of DImode reference.
232 // Verify that this operand has two consecutive registers.
233 if (!MI->getOperand(OpNo).isReg() ||
234 OpNo+1 == MI->getNumOperands() ||
235 !MI->getOperand(OpNo+1).isReg())
237 ++OpNo; // Return the high-part.
240 // Write 'i' if an integer constant, otherwise nothing. Used to print
242 if (MI->getOperand(OpNo).isImm())
248 printOperand(MI, OpNo, O);
252 // At the moment, all inline asm memory operands are a single register.
253 // In any case, the output of this routine should always be just one
254 // assembler operand.
256 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
258 const char *ExtraCode,
260 if (ExtraCode && ExtraCode[0]) {
261 if (ExtraCode[1] != 0) return true; // Unknown modifier.
263 switch (ExtraCode[0]) {
264 default: return true; // Unknown modifier.
265 case 'y': // A memory reference for an X-form instruction
267 const char *RegName = "r0";
268 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
269 O << RegName << ", ";
270 printOperand(MI, OpNo, O);
276 assert(MI->getOperand(OpNo).isReg());
278 printOperand(MI, OpNo, O);
284 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
285 /// exists for it. If not, create one. Then return a symbol that references
287 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
288 const DataLayout *DL = TM.getDataLayout();
289 MCSymbol *&TOCEntry = TOC[Sym];
291 // To avoid name clash check if the name already exists.
293 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
294 "C" + Twine(TOCLabelID++)) == nullptr) {
295 TOCEntry = GetTempSymbol("C", TOCLabelID);
303 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
304 /// the current output stream.
306 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
308 bool isPPC64 = Subtarget.isPPC64();
310 // Lower multi-instruction pseudo operations.
311 switch (MI->getOpcode()) {
313 case TargetOpcode::DBG_VALUE:
314 llvm_unreachable("Should be handled target independently");
315 case PPC::MovePCtoLR:
316 case PPC::MovePCtoLR8: {
317 // Transform %LR = MovePCtoLR
318 // Into this, where the label is the PIC base:
321 MCSymbol *PICBase = MF->getPICBaseSymbol();
324 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
325 // FIXME: We would like an efficient form for this, so we don't have to do
326 // a lot of extra uniquing.
327 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
330 OutStreamer.EmitLabel(PICBase);
336 // Transform %X3 = LDtoc <ga:@min1>, %X2
337 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
339 // Change the opcode to LD, and the global address operand to be a
340 // reference to the TOC entry we will synthesize later.
341 TmpInst.setOpcode(PPC::LD);
342 const MachineOperand &MO = MI->getOperand(1);
344 // Map symbol -> label of TOC entry
345 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
346 MCSymbol *MOSymbol = nullptr;
348 MOSymbol = getSymbol(MO.getGlobal());
350 MOSymbol = GetCPISymbol(MO.getIndex());
352 MOSymbol = GetJTISymbol(MO.getIndex());
354 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
357 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
359 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
360 EmitToStreamer(OutStreamer, TmpInst);
364 case PPC::ADDIStocHA: {
365 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
366 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
368 // Change the opcode to ADDIS8. If the global address is external,
369 // has common linkage, is a function address, or is a jump table
370 // address, then generate a TOC entry and reference that. Otherwise
371 // reference the symbol directly.
372 TmpInst.setOpcode(PPC::ADDIS8);
373 const MachineOperand &MO = MI->getOperand(2);
374 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
375 "Invalid operand for ADDIStocHA!");
376 MCSymbol *MOSymbol = nullptr;
377 bool IsExternal = false;
378 bool IsFunction = false;
379 bool IsCommon = false;
380 bool IsAvailExt = false;
383 const GlobalValue *GValue = MO.getGlobal();
384 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
385 const GlobalValue *RealGValue = GAlias ? GAlias->getAliasee() : GValue;
386 MOSymbol = getSymbol(RealGValue);
387 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
388 IsExternal = GVar && !GVar->hasInitializer();
389 IsCommon = GVar && RealGValue->hasCommonLinkage();
391 IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage();
392 } else if (MO.isCPI())
393 MOSymbol = GetCPISymbol(MO.getIndex());
395 MOSymbol = GetJTISymbol(MO.getIndex());
397 if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI() ||
398 TM.getCodeModel() == CodeModel::Large)
399 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
402 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
404 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
405 EmitToStreamer(OutStreamer, TmpInst);
409 // Transform %Xd = LDtocL <ga:@sym>, %Xs
410 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
412 // Change the opcode to LD. If the global address is external, has
413 // common linkage, or is a jump table address, then reference the
414 // associated TOC entry. Otherwise reference the symbol directly.
415 TmpInst.setOpcode(PPC::LD);
416 const MachineOperand &MO = MI->getOperand(1);
417 assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
418 "Invalid operand for LDtocL!");
419 MCSymbol *MOSymbol = nullptr;
422 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
423 else if (MO.isCPI()) {
424 MOSymbol = GetCPISymbol(MO.getIndex());
425 if (TM.getCodeModel() == CodeModel::Large)
426 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
428 else if (MO.isGlobal()) {
429 const GlobalValue *GValue = MO.getGlobal();
430 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
431 const GlobalValue *RealGValue = GAlias ? GAlias->getAliasee() : GValue;
432 MOSymbol = getSymbol(RealGValue);
433 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
435 if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() ||
436 RealGValue->hasAvailableExternallyLinkage() ||
437 TM.getCodeModel() == CodeModel::Large)
438 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
442 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
444 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
445 EmitToStreamer(OutStreamer, TmpInst);
448 case PPC::ADDItocL: {
449 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
450 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
452 // Change the opcode to ADDI8. If the global address is external, then
453 // generate a TOC entry and reference that. Otherwise reference the
455 TmpInst.setOpcode(PPC::ADDI8);
456 const MachineOperand &MO = MI->getOperand(2);
457 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
458 MCSymbol *MOSymbol = nullptr;
459 bool IsExternal = false;
460 bool IsFunction = false;
463 const GlobalValue *GValue = MO.getGlobal();
464 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue);
465 const GlobalValue *RealGValue = GAlias ? GAlias->getAliasee() : GValue;
466 MOSymbol = getSymbol(RealGValue);
467 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue);
468 IsExternal = GVar && !GVar->hasInitializer();
470 } else if (MO.isCPI())
471 MOSymbol = GetCPISymbol(MO.getIndex());
473 if (IsFunction || IsExternal || TM.getCodeModel() == CodeModel::Large)
474 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
477 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
479 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
480 EmitToStreamer(OutStreamer, TmpInst);
483 case PPC::ADDISgotTprelHA: {
484 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
485 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
486 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
487 const MachineOperand &MO = MI->getOperand(2);
488 const GlobalValue *GValue = MO.getGlobal();
489 MCSymbol *MOSymbol = getSymbol(GValue);
490 const MCExpr *SymGotTprel =
491 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
493 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
494 .addReg(MI->getOperand(0).getReg())
496 .addExpr(SymGotTprel));
499 case PPC::LDgotTprelL:
500 case PPC::LDgotTprelL32: {
501 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
502 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
504 // Change the opcode to LD.
505 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
506 const MachineOperand &MO = MI->getOperand(1);
507 const GlobalValue *GValue = MO.getGlobal();
508 MCSymbol *MOSymbol = getSymbol(GValue);
510 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
512 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
513 EmitToStreamer(OutStreamer, TmpInst);
517 case PPC::PPC32GOT: {
518 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
519 const MCExpr *SymGotTlsL =
520 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
522 const MCExpr *SymGotTlsHA =
523 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
525 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
526 .addReg(MI->getOperand(0).getReg())
527 .addExpr(SymGotTlsL));
528 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
529 .addReg(MI->getOperand(0).getReg())
530 .addReg(MI->getOperand(0).getReg())
531 .addExpr(SymGotTlsHA));
534 case PPC::ADDIStlsgdHA: {
535 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
536 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
537 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
538 const MachineOperand &MO = MI->getOperand(2);
539 const GlobalValue *GValue = MO.getGlobal();
540 MCSymbol *MOSymbol = getSymbol(GValue);
541 const MCExpr *SymGotTlsGD =
542 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
544 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
545 .addReg(MI->getOperand(0).getReg())
547 .addExpr(SymGotTlsGD));
550 case PPC::ADDItlsgdL: {
551 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
552 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
553 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
554 const MachineOperand &MO = MI->getOperand(2);
555 const GlobalValue *GValue = MO.getGlobal();
556 MCSymbol *MOSymbol = getSymbol(GValue);
557 const MCExpr *SymGotTlsGD =
558 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
560 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
561 .addReg(MI->getOperand(0).getReg())
562 .addReg(MI->getOperand(1).getReg())
563 .addExpr(SymGotTlsGD));
566 case PPC::GETtlsADDR: {
567 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
568 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
569 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
571 StringRef Name = "__tls_get_addr";
572 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
573 const MCSymbolRefExpr *TlsRef =
574 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
575 const MachineOperand &MO = MI->getOperand(2);
576 const GlobalValue *GValue = MO.getGlobal();
577 MCSymbol *MOSymbol = getSymbol(GValue);
578 const MCExpr *SymVar =
579 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
581 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
586 case PPC::ADDIStlsldHA: {
587 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
588 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
589 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
590 const MachineOperand &MO = MI->getOperand(2);
591 const GlobalValue *GValue = MO.getGlobal();
592 MCSymbol *MOSymbol = getSymbol(GValue);
593 const MCExpr *SymGotTlsLD =
594 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
596 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
597 .addReg(MI->getOperand(0).getReg())
599 .addExpr(SymGotTlsLD));
602 case PPC::ADDItlsldL: {
603 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
604 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
605 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
606 const MachineOperand &MO = MI->getOperand(2);
607 const GlobalValue *GValue = MO.getGlobal();
608 MCSymbol *MOSymbol = getSymbol(GValue);
609 const MCExpr *SymGotTlsLD =
610 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
612 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
613 .addReg(MI->getOperand(0).getReg())
614 .addReg(MI->getOperand(1).getReg())
615 .addExpr(SymGotTlsLD));
618 case PPC::GETtlsldADDR: {
619 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
620 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
621 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
623 StringRef Name = "__tls_get_addr";
624 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
625 const MCSymbolRefExpr *TlsRef =
626 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
627 const MachineOperand &MO = MI->getOperand(2);
628 const GlobalValue *GValue = MO.getGlobal();
629 MCSymbol *MOSymbol = getSymbol(GValue);
630 const MCExpr *SymVar =
631 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
633 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
638 case PPC::ADDISdtprelHA: {
639 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
640 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
641 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
642 const MachineOperand &MO = MI->getOperand(2);
643 const GlobalValue *GValue = MO.getGlobal();
644 MCSymbol *MOSymbol = getSymbol(GValue);
645 const MCExpr *SymDtprel =
646 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
648 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
649 .addReg(MI->getOperand(0).getReg())
651 .addExpr(SymDtprel));
654 case PPC::ADDIdtprelL: {
655 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
656 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
657 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
658 const MachineOperand &MO = MI->getOperand(2);
659 const GlobalValue *GValue = MO.getGlobal();
660 MCSymbol *MOSymbol = getSymbol(GValue);
661 const MCExpr *SymDtprel =
662 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
664 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
665 .addReg(MI->getOperand(0).getReg())
666 .addReg(MI->getOperand(1).getReg())
667 .addExpr(SymDtprel));
672 if (!Subtarget.hasMFOCRF()) {
673 // Transform: %R3 = MFOCRF %CR7
674 // Into: %R3 = MFCR ;; cr7
676 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
677 OutStreamer.AddComment(PPCInstPrinter::
678 getRegisterName(MI->getOperand(1).getReg()));
679 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
680 .addReg(MI->getOperand(0).getReg()));
686 if (!Subtarget.hasMFOCRF()) {
687 // Transform: %CR7 = MTOCRF %R3
688 // Into: MTCRF mask, %R3 ;; cr7
690 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
691 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
692 ->getEncodingValue(MI->getOperand(0).getReg());
693 OutStreamer.AddComment(PPCInstPrinter::
694 getRegisterName(MI->getOperand(0).getReg()));
695 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
697 .addReg(MI->getOperand(1).getReg()));
705 // Verify alignment is legal, so we don't create relocations
706 // that can't be supported.
707 // FIXME: This test is currently disabled for Darwin. The test
708 // suite shows a handful of test cases that fail this check for
709 // Darwin. Those need to be investigated before this sanity test
710 // can be enabled for those subtargets.
711 if (!Subtarget.isDarwin()) {
712 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
713 const MachineOperand &MO = MI->getOperand(OpNum);
714 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
715 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
717 // Now process the instruction normally.
722 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
723 EmitToStreamer(OutStreamer, TmpInst);
726 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
727 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
728 return AsmPrinter::EmitFunctionEntryLabel();
730 // Emit an official procedure descriptor.
731 MCSectionSubPair Current = OutStreamer.getCurrentSection();
732 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
733 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
734 SectionKind::getReadOnly());
735 OutStreamer.SwitchSection(Section);
736 OutStreamer.EmitLabel(CurrentFnSym);
737 OutStreamer.EmitValueToAlignment(8);
739 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
740 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
742 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
744 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
745 // Generates a R_PPC64_TOC relocation for TOC base insertion.
746 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
747 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
749 // Emit a null environment pointer.
750 OutStreamer.EmitIntValue(0, 8 /* size */);
751 OutStreamer.SwitchSection(Current.first, Current.second);
753 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
754 ".L." + Twine(CurrentFnSym->getName()));
755 OutStreamer.EmitLabel(RealFnSym);
756 CurrentFnSymForSize = RealFnSym;
760 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
761 const DataLayout *TD = TM.getDataLayout();
763 bool isPPC64 = TD->getPointerSizeInBits() == 64;
765 PPCTargetStreamer &TS =
766 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
768 if (isPPC64 && !TOC.empty()) {
769 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
770 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
771 SectionKind::getReadOnly());
772 OutStreamer.SwitchSection(Section);
774 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
775 E = TOC.end(); I != E; ++I) {
776 OutStreamer.EmitLabel(I->second);
777 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
782 MachineModuleInfoELF &MMIELF =
783 MMI->getObjFileInfo<MachineModuleInfoELF>();
785 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
786 if (!Stubs.empty()) {
787 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
788 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
790 OutStreamer.EmitLabel(Stubs[i].first);
792 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
794 isPPC64 ? 8 : 4/*size*/);
798 OutStreamer.AddBlankLine();
801 return AsmPrinter::doFinalization(M);
804 /// EmitFunctionBodyEnd - Print the traceback table before the .size
807 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
808 // Only the 64-bit target requires a traceback table. For now,
809 // we only emit the word of zeroes that GDB requires to find
810 // the end of the function, and zeroes for the eight-byte
812 // FIXME: We should fill in the eight-byte mandatory fields as described in
813 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
814 // currently make use of these fields).
815 if (Subtarget.isPPC64()) {
816 OutStreamer.EmitIntValue(0, 4/*size*/);
817 OutStreamer.EmitIntValue(0, 8/*size*/);
821 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
822 static const char *const CPUDirectives[] = {
846 unsigned Directive = Subtarget.getDarwinDirective();
847 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
848 Directive = PPC::DIR_970;
849 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
850 Directive = PPC::DIR_7400;
851 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
852 Directive = PPC::DIR_64;
853 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
855 assert(Directive < array_lengthof(CPUDirectives) &&
856 "CPUDirectives[] might not be up-to-date!");
857 PPCTargetStreamer &TStreamer =
858 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
859 TStreamer.emitMachine(CPUDirectives[Directive]);
861 // Prime text sections so they are adjacent. This reduces the likelihood a
862 // large data or debug section causes a branch to exceed 16M limit.
863 const TargetLoweringObjectFileMachO &TLOFMacho =
864 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
865 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
866 if (TM.getRelocationModel() == Reloc::PIC_) {
867 OutStreamer.SwitchSection(
868 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
869 MachO::S_SYMBOL_STUBS |
870 MachO::S_ATTR_PURE_INSTRUCTIONS,
871 32, SectionKind::getText()));
872 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
873 OutStreamer.SwitchSection(
874 OutContext.getMachOSection("__TEXT","__symbol_stub1",
875 MachO::S_SYMBOL_STUBS |
876 MachO::S_ATTR_PURE_INSTRUCTIONS,
877 16, SectionKind::getText()));
879 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
882 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
883 // Remove $stub suffix, add $lazy_ptr.
884 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
885 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
888 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
889 // Add $tmp suffix to $stub, yielding $stub$tmp.
890 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
893 void PPCDarwinAsmPrinter::
894 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
895 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
896 bool isDarwin = Subtarget.isDarwin();
898 const TargetLoweringObjectFileMachO &TLOFMacho =
899 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
901 // .lazy_symbol_pointer
902 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
904 // Output stubs for dynamically-linked functions
905 if (TM.getRelocationModel() == Reloc::PIC_) {
906 const MCSection *StubSection =
907 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
908 MachO::S_SYMBOL_STUBS |
909 MachO::S_ATTR_PURE_INSTRUCTIONS,
910 32, SectionKind::getText());
911 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
912 OutStreamer.SwitchSection(StubSection);
915 MCSymbol *Stub = Stubs[i].first;
916 MCSymbol *RawSym = Stubs[i].second.getPointer();
917 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
918 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
920 OutStreamer.EmitLabel(Stub);
921 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
923 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
924 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
926 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
929 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
930 // bcl 20, 31, AnonSymbol
931 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
932 OutStreamer.EmitLabel(AnonSymbol);
934 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
935 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
936 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
937 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
942 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
944 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
945 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
946 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
947 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
949 .addExpr(SubLo16).addExpr(SubLo16)
952 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
954 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
956 OutStreamer.SwitchSection(LSPSection);
957 OutStreamer.EmitLabel(LazyPtr);
958 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
960 MCSymbol *DyldStubBindingHelper =
961 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
963 // .quad dyld_stub_binding_helper
964 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
966 // .long dyld_stub_binding_helper
967 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
970 OutStreamer.AddBlankLine();
974 const MCSection *StubSection =
975 OutContext.getMachOSection("__TEXT","__symbol_stub1",
976 MachO::S_SYMBOL_STUBS |
977 MachO::S_ATTR_PURE_INSTRUCTIONS,
978 16, SectionKind::getText());
979 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
980 MCSymbol *Stub = Stubs[i].first;
981 MCSymbol *RawSym = Stubs[i].second.getPointer();
982 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
983 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
985 OutStreamer.SwitchSection(StubSection);
987 OutStreamer.EmitLabel(Stub);
988 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
990 // lis r11, ha16(LazyPtr)
991 const MCExpr *LazyPtrHa16 =
992 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
993 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
995 .addExpr(LazyPtrHa16));
997 // ldu r12, lo16(LazyPtr)(r11)
998 // lwzu r12, lo16(LazyPtr)(r11)
999 const MCExpr *LazyPtrLo16 =
1000 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1001 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1003 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1007 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1009 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1011 OutStreamer.SwitchSection(LSPSection);
1012 OutStreamer.EmitLabel(LazyPtr);
1013 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1015 MCSymbol *DyldStubBindingHelper =
1016 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1018 // .quad dyld_stub_binding_helper
1019 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1021 // .long dyld_stub_binding_helper
1022 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1026 OutStreamer.AddBlankLine();
1030 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1031 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1033 // Darwin/PPC always uses mach-o.
1034 const TargetLoweringObjectFileMachO &TLOFMacho =
1035 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1036 MachineModuleInfoMachO &MMIMacho =
1037 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1039 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1041 EmitFunctionStubs(Stubs);
1043 if (MAI->doesSupportExceptionHandling() && MMI) {
1044 // Add the (possibly multiple) personalities to the set of global values.
1045 // Only referenced functions get into the Personalities list.
1046 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1047 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1048 E = Personalities.end(); I != E; ++I) {
1050 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1051 MachineModuleInfoImpl::StubValueTy &StubSym =
1052 MMIMacho.getGVStubEntry(NLPSym);
1053 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1058 // Output stubs for dynamically-linked functions.
1059 Stubs = MMIMacho.GetGVStubList();
1061 // Output macho stubs for external and common global variables.
1062 if (!Stubs.empty()) {
1063 // Switch with ".non_lazy_symbol_pointer" directive.
1064 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1065 EmitAlignment(isPPC64 ? 3 : 2);
1067 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1069 OutStreamer.EmitLabel(Stubs[i].first);
1070 // .indirect_symbol _foo
1071 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1072 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1075 // External to current translation unit.
1076 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1078 // Internal to current translation unit.
1080 // When we place the LSDA into the TEXT section, the type info pointers
1081 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1082 // However, sometimes the types are local to the file. So we need to
1083 // fill in the value for the NLP in those cases.
1084 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1086 isPPC64 ? 8 : 4/*size*/);
1090 OutStreamer.AddBlankLine();
1093 Stubs = MMIMacho.GetHiddenGVStubList();
1094 if (!Stubs.empty()) {
1095 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1096 EmitAlignment(isPPC64 ? 3 : 2);
1098 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1100 OutStreamer.EmitLabel(Stubs[i].first);
1102 OutStreamer.EmitValue(MCSymbolRefExpr::
1103 Create(Stubs[i].second.getPointer(),
1105 isPPC64 ? 8 : 4/*size*/);
1109 OutStreamer.AddBlankLine();
1112 // Funny Darwin hack: This flag tells the linker that no global symbols
1113 // contain code that falls through to other global symbols (e.g. the obvious
1114 // implementation of multiple entry points). If this doesn't occur, the
1115 // linker can safely perform dead code stripping. Since LLVM never generates
1116 // code that does this, it is always safe to set.
1117 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1119 return AsmPrinter::doFinalization(M);
1122 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1123 /// for a MachineFunction to the given output stream, in a format that the
1124 /// Darwin assembler can deal with.
1126 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1127 MCStreamer &Streamer) {
1128 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1130 if (Subtarget->isDarwin())
1131 return new PPCDarwinAsmPrinter(tm, Streamer);
1132 return new PPCLinuxAsmPrinter(tm, Streamer);
1135 // Force static initialization.
1136 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1137 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1138 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1139 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);