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 "PPCTargetMachine.h"
22 #include "PPCSubtarget.h"
23 #include "InstPrinter/PPCInstPrinter.h"
24 #include "MCTargetDesc/PPCPredicates.h"
25 #include "llvm/Constants.h"
26 #include "llvm/DebugInfo.h"
27 #include "llvm/DerivedTypes.h"
28 #include "llvm/Module.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/MC/MCAsmInfo.h"
37 #include "llvm/MC/MCContext.h"
38 #include "llvm/MC/MCExpr.h"
39 #include "llvm/MC/MCInst.h"
40 #include "llvm/MC/MCSectionMachO.h"
41 #include "llvm/MC/MCStreamer.h"
42 #include "llvm/MC/MCSymbol.h"
43 #include "llvm/MC/MCSectionELF.h"
44 #include "llvm/Target/Mangler.h"
45 #include "llvm/Target/TargetRegisterInfo.h"
46 #include "llvm/Target/TargetInstrInfo.h"
47 #include "llvm/Target/TargetOptions.h"
48 #include "llvm/Support/CommandLine.h"
49 #include "llvm/Support/Debug.h"
50 #include "llvm/Support/MathExtras.h"
51 #include "llvm/Support/ErrorHandling.h"
52 #include "llvm/Support/TargetRegistry.h"
53 #include "llvm/Support/raw_ostream.h"
54 #include "llvm/Support/ELF.h"
55 #include "llvm/ADT/StringExtras.h"
56 #include "llvm/ADT/SmallString.h"
57 #include "llvm/ADT/MapVector.h"
61 class PPCAsmPrinter : public AsmPrinter {
63 MapVector<MCSymbol*, MCSymbol*> TOC;
64 const PPCSubtarget &Subtarget;
67 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
68 : AsmPrinter(TM, Streamer),
69 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
71 virtual const char *getPassName() const {
72 return "PowerPC Assembly Printer";
76 virtual void EmitInstruction(const MachineInstr *MI);
78 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
80 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
81 unsigned AsmVariant, const char *ExtraCode,
83 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
84 unsigned AsmVariant, const char *ExtraCode,
87 MachineLocation getDebugValueLocation(const MachineInstr *MI) const {
88 MachineLocation Location;
89 assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
90 // Frame address. Currently handles register +- offset only.
91 if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm())
92 Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm());
94 DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
100 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
101 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
103 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
104 : PPCAsmPrinter(TM, Streamer) {}
106 virtual const char *getPassName() const {
107 return "Linux PPC Assembly Printer";
110 bool doFinalization(Module &M);
112 virtual void EmitFunctionEntryLabel();
114 void EmitFunctionBodyEnd();
117 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
119 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
121 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
122 : PPCAsmPrinter(TM, Streamer) {}
124 virtual const char *getPassName() const {
125 return "Darwin PPC Assembly Printer";
128 bool doFinalization(Module &M);
129 void EmitStartOfAsmFile(Module &M);
131 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
133 } // end of anonymous namespace
135 /// stripRegisterPrefix - This method strips the character prefix from a
136 /// register name so that only the number is left. Used by for linux asm.
137 static const char *stripRegisterPrefix(const char *RegName) {
138 switch (RegName[0]) {
141 case 'v': return RegName + 1;
142 case 'c': if (RegName[1] == 'r') return RegName + 2;
148 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
150 const MachineOperand &MO = MI->getOperand(OpNo);
152 switch (MO.getType()) {
153 case MachineOperand::MO_Register: {
154 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
155 // Linux assembler (Others?) does not take register mnemonics.
156 // FIXME - What about special registers used in mfspr/mtspr?
157 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
161 case MachineOperand::MO_Immediate:
165 case MachineOperand::MO_MachineBasicBlock:
166 O << *MO.getMBB()->getSymbol();
168 case MachineOperand::MO_JumpTableIndex:
169 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
170 << '_' << MO.getIndex();
171 // FIXME: PIC relocation model
173 case MachineOperand::MO_ConstantPoolIndex:
174 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
175 << '_' << MO.getIndex();
177 case MachineOperand::MO_BlockAddress:
178 O << *GetBlockAddressSymbol(MO.getBlockAddress());
180 case MachineOperand::MO_ExternalSymbol: {
181 // Computing the address of an external symbol, not calling it.
182 if (TM.getRelocationModel() == Reloc::Static) {
183 O << *GetExternalSymbolSymbol(MO.getSymbolName());
188 OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
189 MO.getSymbolName()+"$non_lazy_ptr");
190 MachineModuleInfoImpl::StubValueTy &StubSym =
191 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
192 if (StubSym.getPointer() == 0)
193 StubSym = MachineModuleInfoImpl::
194 StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
199 case MachineOperand::MO_GlobalAddress: {
200 // Computing the address of a global symbol, not calling it.
201 const GlobalValue *GV = MO.getGlobal();
202 MCSymbol *SymToPrint;
204 // External or weakly linked global variables need non-lazily-resolved stubs
205 if (TM.getRelocationModel() != Reloc::Static &&
206 (GV->isDeclaration() || GV->isWeakForLinker())) {
207 if (!GV->hasHiddenVisibility()) {
208 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
209 MachineModuleInfoImpl::StubValueTy &StubSym =
210 MMI->getObjFileInfo<MachineModuleInfoMachO>()
211 .getGVStubEntry(SymToPrint);
212 if (StubSym.getPointer() == 0)
213 StubSym = MachineModuleInfoImpl::
214 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
215 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
216 GV->hasAvailableExternallyLinkage()) {
217 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
219 MachineModuleInfoImpl::StubValueTy &StubSym =
220 MMI->getObjFileInfo<MachineModuleInfoMachO>().
221 getHiddenGVStubEntry(SymToPrint);
222 if (StubSym.getPointer() == 0)
223 StubSym = MachineModuleInfoImpl::
224 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
226 SymToPrint = Mang->getSymbol(GV);
229 SymToPrint = Mang->getSymbol(GV);
234 printOffset(MO.getOffset(), O);
239 O << "<unknown operand type: " << MO.getType() << ">";
244 /// PrintAsmOperand - Print out an operand for an inline asm expression.
246 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
248 const char *ExtraCode, raw_ostream &O) {
249 // Does this asm operand have a single letter operand modifier?
250 if (ExtraCode && ExtraCode[0]) {
251 if (ExtraCode[1] != 0) return true; // Unknown modifier.
253 switch (ExtraCode[0]) {
255 // See if this is a generic print operand
256 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
257 case 'c': // Don't print "$" before a global var name or constant.
258 break; // PPC never has a prefix.
259 case 'L': // Write second word of DImode reference.
260 // Verify that this operand has two consecutive registers.
261 if (!MI->getOperand(OpNo).isReg() ||
262 OpNo+1 == MI->getNumOperands() ||
263 !MI->getOperand(OpNo+1).isReg())
265 ++OpNo; // Return the high-part.
268 // Write 'i' if an integer constant, otherwise nothing. Used to print
270 if (MI->getOperand(OpNo).isImm())
276 printOperand(MI, OpNo, O);
280 // At the moment, all inline asm memory operands are a single register.
281 // In any case, the output of this routine should always be just one
282 // assembler operand.
284 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
286 const char *ExtraCode,
288 if (ExtraCode && ExtraCode[0]) {
289 if (ExtraCode[1] != 0) return true; // Unknown modifier.
291 switch (ExtraCode[0]) {
292 default: return true; // Unknown modifier.
293 case 'y': // A memory reference for an X-form instruction
295 const char *RegName = "r0";
296 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
297 O << RegName << ", ";
298 printOperand(MI, OpNo, O);
304 assert(MI->getOperand(OpNo).isReg());
306 printOperand(MI, OpNo, O);
312 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
313 /// the current output stream.
315 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
318 // Lower multi-instruction pseudo operations.
319 switch (MI->getOpcode()) {
321 case TargetOpcode::DBG_VALUE: {
322 if (!isVerbose() || !OutStreamer.hasRawTextSupport()) return;
325 raw_svector_ostream O(Str);
326 unsigned NOps = MI->getNumOperands();
328 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
329 // cast away const; DIetc do not take const operands for some reason.
330 DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
333 // Frame address. Currently handles register +- offset only.
334 assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
335 O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O);
338 printOperand(MI, NOps-2, O);
339 OutStreamer.EmitRawText(O.str());
343 case PPC::MovePCtoLR:
344 case PPC::MovePCtoLR8: {
345 // Transform %LR = MovePCtoLR
346 // Into this, where the label is the PIC base:
349 MCSymbol *PICBase = MF->getPICBaseSymbol();
352 TmpInst.setOpcode(PPC::BL_Darwin); // Darwin vs SVR4 doesn't matter here.
355 // FIXME: We would like an efficient form for this, so we don't have to do
356 // a lot of extra uniquing.
357 TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::
358 Create(PICBase, OutContext)));
359 OutStreamer.EmitInstruction(TmpInst);
362 OutStreamer.EmitLabel(PICBase);
368 // Transform %X3 = LDtoc <ga:@min1>, %X2
369 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
371 // Change the opcode to LD, and the global address operand to be a
372 // reference to the TOC entry we will synthesize later.
373 TmpInst.setOpcode(PPC::LD);
374 const MachineOperand &MO = MI->getOperand(1);
376 // Map symbol -> label of TOC entry
377 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
378 MCSymbol *MOSymbol = 0;
380 MOSymbol = Mang->getSymbol(MO.getGlobal());
382 MOSymbol = GetCPISymbol(MO.getIndex());
384 MOSymbol = GetJTISymbol(MO.getIndex());
385 MCSymbol *&TOCEntry = TOC[MOSymbol];
386 // To avoid name clash check if the name already exists.
387 while (TOCEntry == 0) {
388 if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
389 "C" + Twine(TOCLabelID++)) == 0) {
390 TOCEntry = GetTempSymbol("C", TOCLabelID);
395 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC_ENTRY,
397 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
398 OutStreamer.EmitInstruction(TmpInst);
403 case PPC::MFCR8pseud:
404 // Transform: %R3 = MFCRpseud %CR7
405 // Into: %R3 = MFCR ;; cr7
406 OutStreamer.AddComment(PPCInstPrinter::
407 getRegisterName(MI->getOperand(1).getReg()));
408 TmpInst.setOpcode(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR);
409 TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
410 OutStreamer.EmitInstruction(TmpInst);
413 // In Book E sync is called msync, handle this special case here...
414 if (Subtarget.isBookE()) {
415 OutStreamer.EmitRawText(StringRef("\tmsync"));
420 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
421 OutStreamer.EmitInstruction(TmpInst);
424 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
425 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
426 return AsmPrinter::EmitFunctionEntryLabel();
428 // Emit an official procedure descriptor.
429 const MCSection *Current = OutStreamer.getCurrentSection();
430 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
431 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
432 SectionKind::getReadOnly());
433 OutStreamer.SwitchSection(Section);
434 OutStreamer.EmitLabel(CurrentFnSym);
435 OutStreamer.EmitValueToAlignment(8);
437 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
438 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
440 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
441 8/*size*/, 0/*addrspace*/);
442 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
443 // Generates a R_PPC64_TOC relocation for TOC base insertion.
444 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
445 MCSymbolRefExpr::VK_PPC_TOC, OutContext),
446 8/*size*/, 0/*addrspace*/);
447 // Emit a null environment pointer.
448 OutStreamer.EmitIntValue(0, 8 /* size */, 0 /* addrspace */);
449 OutStreamer.SwitchSection(Current);
451 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
452 ".L." + Twine(CurrentFnSym->getName()));
453 OutStreamer.EmitLabel(RealFnSym);
454 CurrentFnSymForSize = RealFnSym;
458 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
459 const DataLayout *TD = TM.getDataLayout();
461 bool isPPC64 = TD->getPointerSizeInBits() == 64;
463 if (isPPC64 && !TOC.empty()) {
464 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
465 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
466 SectionKind::getReadOnly());
467 OutStreamer.SwitchSection(Section);
469 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
470 E = TOC.end(); I != E; ++I) {
471 OutStreamer.EmitLabel(I->second);
472 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
473 OutStreamer.EmitTCEntry(*S);
477 return AsmPrinter::doFinalization(M);
480 /// EmitFunctionBodyEnd - Print the traceback table before the .size
483 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
484 // Only the 64-bit target requires a traceback table. For now,
485 // we only emit the word of zeroes that GDB requires to find
486 // the end of the function, and zeroes for the eight-byte
488 // FIXME: We should fill in the eight-byte mandatory fields as described in
489 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
490 // currently make use of these fields).
491 if (Subtarget.isPPC64()) {
492 OutStreamer.EmitIntValue(0, 4/*size*/);
493 OutStreamer.EmitIntValue(0, 8/*size*/);
497 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
498 static const char *const CPUDirectives[] = {
516 unsigned Directive = Subtarget.getDarwinDirective();
517 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
518 Directive = PPC::DIR_970;
519 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
520 Directive = PPC::DIR_7400;
521 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
522 Directive = PPC::DIR_64;
523 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
525 // FIXME: This is a total hack, finish mc'izing the PPC backend.
526 if (OutStreamer.hasRawTextSupport())
527 OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
529 // Prime text sections so they are adjacent. This reduces the likelihood a
530 // large data or debug section causes a branch to exceed 16M limit.
531 const TargetLoweringObjectFileMachO &TLOFMacho =
532 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
533 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
534 if (TM.getRelocationModel() == Reloc::PIC_) {
535 OutStreamer.SwitchSection(
536 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
537 MCSectionMachO::S_SYMBOL_STUBS |
538 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
539 32, SectionKind::getText()));
540 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
541 OutStreamer.SwitchSection(
542 OutContext.getMachOSection("__TEXT","__symbol_stub1",
543 MCSectionMachO::S_SYMBOL_STUBS |
544 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
545 16, SectionKind::getText()));
547 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
550 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
551 // Remove $stub suffix, add $lazy_ptr.
552 SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()-5);
553 TmpStr += "$lazy_ptr";
554 return Ctx.GetOrCreateSymbol(TmpStr.str());
557 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
558 // Add $tmp suffix to $stub, yielding $stub$tmp.
559 SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end());
561 return Ctx.GetOrCreateSymbol(TmpStr.str());
564 void PPCDarwinAsmPrinter::
565 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
566 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
568 const TargetLoweringObjectFileMachO &TLOFMacho =
569 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
571 // .lazy_symbol_pointer
572 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
574 // Output stubs for dynamically-linked functions
575 if (TM.getRelocationModel() == Reloc::PIC_) {
576 const MCSection *StubSection =
577 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
578 MCSectionMachO::S_SYMBOL_STUBS |
579 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
580 32, SectionKind::getText());
581 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
582 OutStreamer.SwitchSection(StubSection);
585 MCSymbol *Stub = Stubs[i].first;
586 MCSymbol *RawSym = Stubs[i].second.getPointer();
587 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
588 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
590 OutStreamer.EmitLabel(Stub);
591 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
592 // FIXME: MCize this.
593 OutStreamer.EmitRawText(StringRef("\tmflr r0"));
594 OutStreamer.EmitRawText("\tbcl 20,31," + Twine(AnonSymbol->getName()));
595 OutStreamer.EmitLabel(AnonSymbol);
596 OutStreamer.EmitRawText(StringRef("\tmflr r11"));
597 OutStreamer.EmitRawText("\taddis r11,r11,ha16("+Twine(LazyPtr->getName())+
598 "-" + AnonSymbol->getName() + ")");
599 OutStreamer.EmitRawText(StringRef("\tmtlr r0"));
602 OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
603 "-" + AnonSymbol->getName() + ")(r11)");
605 OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
606 "-" + AnonSymbol->getName() + ")(r11)");
607 OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
608 OutStreamer.EmitRawText(StringRef("\tbctr"));
610 OutStreamer.SwitchSection(LSPSection);
611 OutStreamer.EmitLabel(LazyPtr);
612 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
615 OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
617 OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
619 OutStreamer.AddBlankLine();
623 const MCSection *StubSection =
624 OutContext.getMachOSection("__TEXT","__symbol_stub1",
625 MCSectionMachO::S_SYMBOL_STUBS |
626 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
627 16, SectionKind::getText());
628 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
629 MCSymbol *Stub = Stubs[i].first;
630 MCSymbol *RawSym = Stubs[i].second.getPointer();
631 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
633 OutStreamer.SwitchSection(StubSection);
635 OutStreamer.EmitLabel(Stub);
636 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
637 OutStreamer.EmitRawText("\tlis r11,ha16(" + Twine(LazyPtr->getName()) +")");
639 OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
642 OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
644 OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
645 OutStreamer.EmitRawText(StringRef("\tbctr"));
646 OutStreamer.SwitchSection(LSPSection);
647 OutStreamer.EmitLabel(LazyPtr);
648 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
651 OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
653 OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
656 OutStreamer.AddBlankLine();
660 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
661 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
663 // Darwin/PPC always uses mach-o.
664 const TargetLoweringObjectFileMachO &TLOFMacho =
665 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
666 MachineModuleInfoMachO &MMIMacho =
667 MMI->getObjFileInfo<MachineModuleInfoMachO>();
669 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
671 EmitFunctionStubs(Stubs);
673 if (MAI->doesSupportExceptionHandling() && MMI) {
674 // Add the (possibly multiple) personalities to the set of global values.
675 // Only referenced functions get into the Personalities list.
676 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
677 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
678 E = Personalities.end(); I != E; ++I) {
680 MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
681 MachineModuleInfoImpl::StubValueTy &StubSym =
682 MMIMacho.getGVStubEntry(NLPSym);
683 StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
688 // Output stubs for dynamically-linked functions.
689 Stubs = MMIMacho.GetGVStubList();
691 // Output macho stubs for external and common global variables.
692 if (!Stubs.empty()) {
693 // Switch with ".non_lazy_symbol_pointer" directive.
694 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
695 EmitAlignment(isPPC64 ? 3 : 2);
697 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
699 OutStreamer.EmitLabel(Stubs[i].first);
700 // .indirect_symbol _foo
701 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
702 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
705 // External to current translation unit.
706 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
708 // Internal to current translation unit.
710 // When we place the LSDA into the TEXT section, the type info pointers
711 // need to be indirect and pc-rel. We accomplish this by using NLPs.
712 // However, sometimes the types are local to the file. So we need to
713 // fill in the value for the NLP in those cases.
714 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
716 isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
720 OutStreamer.AddBlankLine();
723 Stubs = MMIMacho.GetHiddenGVStubList();
724 if (!Stubs.empty()) {
725 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
726 EmitAlignment(isPPC64 ? 3 : 2);
728 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
730 OutStreamer.EmitLabel(Stubs[i].first);
732 OutStreamer.EmitValue(MCSymbolRefExpr::
733 Create(Stubs[i].second.getPointer(),
735 isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
739 OutStreamer.AddBlankLine();
742 // Funny Darwin hack: This flag tells the linker that no global symbols
743 // contain code that falls through to other global symbols (e.g. the obvious
744 // implementation of multiple entry points). If this doesn't occur, the
745 // linker can safely perform dead code stripping. Since LLVM never generates
746 // code that does this, it is always safe to set.
747 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
749 return AsmPrinter::doFinalization(M);
752 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
753 /// for a MachineFunction to the given output stream, in a format that the
754 /// Darwin assembler can deal with.
756 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
757 MCStreamer &Streamer) {
758 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
760 if (Subtarget->isDarwin())
761 return new PPCDarwinAsmPrinter(tm, Streamer);
762 return new PPCLinuxAsmPrinter(tm, Streamer);
765 // Force static initialization.
766 extern "C" void LLVMInitializePowerPCAsmPrinter() {
767 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
768 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);