| //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to PowerPC assembly language. This printer is |
| // the output mechanism used by `llc'. |
| // |
| // Documentation at http://developer.apple.com/documentation/DeveloperTools/ |
| // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "asmprinter" |
| #include "PPC.h" |
| #include "PPCTargetMachine.h" |
| #include "PPCSubtarget.h" |
| #include "MCTargetDesc/PPCPredicates.h" |
| #include "llvm/Analysis/DebugInfo.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Assembly/Writer.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineModuleInfoImpls.h" |
| #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCInst.h" |
| #include "llvm/MC/MCSectionMachO.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Target/Mangler.h" |
| #include "llvm/Target/TargetRegisterInfo.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/StringSet.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "InstPrinter/PPCInstPrinter.h" |
| using namespace llvm; |
| |
| namespace { |
| class PPCAsmPrinter : public AsmPrinter { |
| protected: |
| DenseMap<MCSymbol*, MCSymbol*> TOC; |
| const PPCSubtarget &Subtarget; |
| uint64_t TOCLabelID; |
| public: |
| explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : AsmPrinter(TM, Streamer), |
| Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {} |
| |
| virtual const char *getPassName() const { |
| return "PowerPC Assembly Printer"; |
| } |
| |
| |
| virtual void EmitInstruction(const MachineInstr *MI); |
| |
| void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O); |
| |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &O); |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &O); |
| |
| MachineLocation getDebugValueLocation(const MachineInstr *MI) const { |
| MachineLocation Location; |
| assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!"); |
| // Frame address. Currently handles register +- offset only. |
| if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm()) |
| Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm()); |
| else { |
| DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n"); |
| } |
| return Location; |
| } |
| }; |
| |
| /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux |
| class PPCLinuxAsmPrinter : public PPCAsmPrinter { |
| public: |
| explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : PPCAsmPrinter(TM, Streamer) {} |
| |
| virtual const char *getPassName() const { |
| return "Linux PPC Assembly Printer"; |
| } |
| |
| bool doFinalization(Module &M); |
| |
| virtual void EmitFunctionEntryLabel(); |
| }; |
| |
| /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac |
| /// OS X |
| class PPCDarwinAsmPrinter : public PPCAsmPrinter { |
| public: |
| explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : PPCAsmPrinter(TM, Streamer) {} |
| |
| virtual const char *getPassName() const { |
| return "Darwin PPC Assembly Printer"; |
| } |
| |
| bool doFinalization(Module &M); |
| void EmitStartOfAsmFile(Module &M); |
| |
| void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs); |
| }; |
| } // end of anonymous namespace |
| |
| /// stripRegisterPrefix - This method strips the character prefix from a |
| /// register name so that only the number is left. Used by for linux asm. |
| static const char *stripRegisterPrefix(const char *RegName) { |
| switch (RegName[0]) { |
| case 'r': |
| case 'f': |
| case 'v': return RegName + 1; |
| case 'c': if (RegName[1] == 'r') return RegName + 2; |
| } |
| |
| return RegName; |
| } |
| |
| void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, |
| raw_ostream &O) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: { |
| const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg()); |
| // Linux assembler (Others?) does not take register mnemonics. |
| // FIXME - What about special registers used in mfspr/mtspr? |
| if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); |
| O << RegName; |
| return; |
| } |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| return; |
| |
| case MachineOperand::MO_MachineBasicBlock: |
| O << *MO.getMBB()->getSymbol(); |
| return; |
| case MachineOperand::MO_JumpTableIndex: |
| O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| // FIXME: PIC relocation model |
| return; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| return; |
| case MachineOperand::MO_BlockAddress: |
| O << *GetBlockAddressSymbol(MO.getBlockAddress()); |
| return; |
| case MachineOperand::MO_ExternalSymbol: { |
| // Computing the address of an external symbol, not calling it. |
| if (TM.getRelocationModel() == Reloc::Static) { |
| O << *GetExternalSymbolSymbol(MO.getSymbolName()); |
| return; |
| } |
| |
| MCSymbol *NLPSym = |
| OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+ |
| MO.getSymbolName()+"$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym); |
| if (StubSym.getPointer() == 0) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true); |
| |
| O << *NLPSym; |
| return; |
| } |
| case MachineOperand::MO_GlobalAddress: { |
| // Computing the address of a global symbol, not calling it. |
| const GlobalValue *GV = MO.getGlobal(); |
| MCSymbol *SymToPrint; |
| |
| // External or weakly linked global variables need non-lazily-resolved stubs |
| if (TM.getRelocationModel() != Reloc::Static && |
| (GV->isDeclaration() || GV->isWeakForLinker())) { |
| if (!GV->hasHiddenVisibility()) { |
| SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>() |
| .getGVStubEntry(SymToPrint); |
| if (StubSym.getPointer() == 0) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); |
| } else if (GV->isDeclaration() || GV->hasCommonLinkage() || |
| GV->hasAvailableExternallyLinkage()) { |
| SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>(). |
| getHiddenGVStubEntry(SymToPrint); |
| if (StubSym.getPointer() == 0) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); |
| } else { |
| SymToPrint = Mang->getSymbol(GV); |
| } |
| } else { |
| SymToPrint = Mang->getSymbol(GV); |
| } |
| |
| O << *SymToPrint; |
| |
| printOffset(MO.getOffset(), O); |
| return; |
| } |
| |
| default: |
| O << "<unknown operand type: " << MO.getType() << ">"; |
| return; |
| } |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode, raw_ostream &O) { |
| // Does this asm operand have a single letter operand modifier? |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: return true; // Unknown modifier. |
| case 'c': // Don't print "$" before a global var name or constant. |
| break; // PPC never has a prefix. |
| case 'L': // Write second word of DImode reference. |
| // Verify that this operand has two consecutive registers. |
| if (!MI->getOperand(OpNo).isReg() || |
| OpNo+1 == MI->getNumOperands() || |
| !MI->getOperand(OpNo+1).isReg()) |
| return true; |
| ++OpNo; // Return the high-part. |
| break; |
| case 'I': |
| // Write 'i' if an integer constant, otherwise nothing. Used to print |
| // addi vs add, etc. |
| if (MI->getOperand(OpNo).isImm()) |
| O << "i"; |
| return false; |
| } |
| } |
| |
| printOperand(MI, OpNo, O); |
| return false; |
| } |
| |
| // At the moment, all inline asm memory operands are a single register. |
| // In any case, the output of this routine should always be just one |
| // assembler operand. |
| |
| bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode, |
| raw_ostream &O) { |
| if (ExtraCode && ExtraCode[0]) |
| return true; // Unknown modifier. |
| assert(MI->getOperand(OpNo).isReg()); |
| O << "0("; |
| printOperand(MI, OpNo, O); |
| O << ")"; |
| return false; |
| } |
| |
| |
| /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to |
| /// the current output stream. |
| /// |
| void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) { |
| MCInst TmpInst; |
| |
| // Lower multi-instruction pseudo operations. |
| switch (MI->getOpcode()) { |
| default: break; |
| case TargetOpcode::DBG_VALUE: { |
| if (!isVerbose() || !OutStreamer.hasRawTextSupport()) return; |
| |
| SmallString<32> Str; |
| raw_svector_ostream O(Str); |
| unsigned NOps = MI->getNumOperands(); |
| assert(NOps==4); |
| O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: "; |
| // cast away const; DIetc do not take const operands for some reason. |
| DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata())); |
| O << V.getName(); |
| O << " <- "; |
| // Frame address. Currently handles register +- offset only. |
| assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm()); |
| O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O); |
| O << ']'; |
| O << "+"; |
| printOperand(MI, NOps-2, O); |
| OutStreamer.EmitRawText(O.str()); |
| return; |
| } |
| |
| case PPC::MovePCtoLR: |
| case PPC::MovePCtoLR8: { |
| // Transform %LR = MovePCtoLR |
| // Into this, where the label is the PIC base: |
| // bl L1$pb |
| // L1$pb: |
| MCSymbol *PICBase = MF->getPICBaseSymbol(); |
| |
| // Emit the 'bl'. |
| TmpInst.setOpcode(PPC::BL_Darwin); // Darwin vs SVR4 doesn't matter here. |
| |
| |
| // FIXME: We would like an efficient form for this, so we don't have to do |
| // a lot of extra uniquing. |
| TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr:: |
| Create(PICBase, OutContext))); |
| OutStreamer.EmitInstruction(TmpInst); |
| |
| // Emit the label. |
| OutStreamer.EmitLabel(PICBase); |
| return; |
| } |
| case PPC::LDtoc: { |
| // Transform %X3 = LDtoc <ga:@min1>, %X2 |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); |
| |
| // Change the opcode to LD, and the global address operand to be a |
| // reference to the TOC entry we will synthesize later. |
| TmpInst.setOpcode(PPC::LD); |
| const MachineOperand &MO = MI->getOperand(1); |
| assert(MO.isGlobal()); |
| |
| // Map symbol -> label of TOC entry. |
| MCSymbol *&TOCEntry = TOC[Mang->getSymbol(MO.getGlobal())]; |
| if (TOCEntry == 0) |
| TOCEntry = GetTempSymbol("C", TOCLabelID++); |
| |
| const MCExpr *Exp = |
| MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC, |
| OutContext); |
| TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); |
| OutStreamer.EmitInstruction(TmpInst); |
| return; |
| } |
| |
| case PPC::MFCRpseud: |
| // Transform: %R3 = MFCRpseud %CR7 |
| // Into: %R3 = MFCR ;; cr7 |
| OutStreamer.AddComment(PPCInstPrinter:: |
| getRegisterName(MI->getOperand(1).getReg())); |
| TmpInst.setOpcode(PPC::MFCR); |
| TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg())); |
| OutStreamer.EmitInstruction(TmpInst); |
| return; |
| } |
| |
| LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); |
| OutStreamer.EmitInstruction(TmpInst); |
| } |
| |
| void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() { |
| if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label. |
| return AsmPrinter::EmitFunctionEntryLabel(); |
| |
| // Emit an official procedure descriptor. |
| // FIXME 64-bit SVR4: Use MCSection here! |
| OutStreamer.EmitRawText(StringRef("\t.section\t\".opd\",\"aw\"")); |
| OutStreamer.EmitRawText(StringRef("\t.align 3")); |
| OutStreamer.EmitLabel(CurrentFnSym); |
| OutStreamer.EmitRawText("\t.quad .L." + Twine(CurrentFnSym->getName()) + |
| ",.TOC.@tocbase"); |
| OutStreamer.EmitRawText(StringRef("\t.previous")); |
| OutStreamer.EmitRawText(".L." + Twine(CurrentFnSym->getName()) + ":"); |
| } |
| |
| |
| bool PPCLinuxAsmPrinter::doFinalization(Module &M) { |
| const TargetData *TD = TM.getTargetData(); |
| |
| bool isPPC64 = TD->getPointerSizeInBits() == 64; |
| |
| if (isPPC64 && !TOC.empty()) { |
| // FIXME 64-bit SVR4: Use MCSection here? |
| OutStreamer.EmitRawText(StringRef("\t.section\t\".toc\",\"aw\"")); |
| |
| // FIXME: This is nondeterminstic! |
| for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(), |
| E = TOC.end(); I != E; ++I) { |
| OutStreamer.EmitLabel(I->second); |
| OutStreamer.EmitRawText("\t.tc " + Twine(I->first->getName()) + |
| "[TC]," + I->first->getName()); |
| } |
| } |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) { |
| static const char *const CPUDirectives[] = { |
| "", |
| "ppc", |
| "ppc601", |
| "ppc602", |
| "ppc603", |
| "ppc7400", |
| "ppc750", |
| "ppc970", |
| "ppc64" |
| }; |
| |
| unsigned Directive = Subtarget.getDarwinDirective(); |
| if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970) |
| Directive = PPC::DIR_970; |
| if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400) |
| Directive = PPC::DIR_7400; |
| if (Subtarget.isPPC64() && Directive < PPC::DIR_970) |
| Directive = PPC::DIR_64; |
| assert(Directive <= PPC::DIR_64 && "Directive out of range."); |
| |
| // FIXME: This is a total hack, finish mc'izing the PPC backend. |
| if (OutStreamer.hasRawTextSupport()) |
| OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive])); |
| |
| // Prime text sections so they are adjacent. This reduces the likelihood a |
| // large data or debug section causes a branch to exceed 16M limit. |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection()); |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| OutStreamer.SwitchSection( |
| OutContext.getMachOSection("__TEXT", "__picsymbolstub1", |
| MCSectionMachO::S_SYMBOL_STUBS | |
| MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, |
| 32, SectionKind::getText())); |
| } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) { |
| OutStreamer.SwitchSection( |
| OutContext.getMachOSection("__TEXT","__symbol_stub1", |
| MCSectionMachO::S_SYMBOL_STUBS | |
| MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, |
| 16, SectionKind::getText())); |
| } |
| OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); |
| } |
| |
| static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) { |
| // Remove $stub suffix, add $lazy_ptr. |
| SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()-5); |
| TmpStr += "$lazy_ptr"; |
| return Ctx.GetOrCreateSymbol(TmpStr.str()); |
| } |
| |
| static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) { |
| // Add $tmp suffix to $stub, yielding $stub$tmp. |
| SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()); |
| TmpStr += "$tmp"; |
| return Ctx.GetOrCreateSymbol(TmpStr.str()); |
| } |
| |
| void PPCDarwinAsmPrinter:: |
| EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) { |
| bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64; |
| |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| |
| // .lazy_symbol_pointer |
| const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection(); |
| |
| // Output stubs for dynamically-linked functions |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| const MCSection *StubSection = |
| OutContext.getMachOSection("__TEXT", "__picsymbolstub1", |
| MCSectionMachO::S_SYMBOL_STUBS | |
| MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, |
| 32, SectionKind::getText()); |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| OutStreamer.SwitchSection(StubSection); |
| EmitAlignment(4); |
| |
| MCSymbol *Stub = Stubs[i].first; |
| MCSymbol *RawSym = Stubs[i].second.getPointer(); |
| MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); |
| MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext); |
| |
| OutStreamer.EmitLabel(Stub); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| // FIXME: MCize this. |
| OutStreamer.EmitRawText(StringRef("\tmflr r0")); |
| OutStreamer.EmitRawText("\tbcl 20,31," + Twine(AnonSymbol->getName())); |
| OutStreamer.EmitLabel(AnonSymbol); |
| OutStreamer.EmitRawText(StringRef("\tmflr r11")); |
| OutStreamer.EmitRawText("\taddis r11,r11,ha16("+Twine(LazyPtr->getName())+ |
| "-" + AnonSymbol->getName() + ")"); |
| OutStreamer.EmitRawText(StringRef("\tmtlr r0")); |
| |
| if (isPPC64) |
| OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) + |
| "-" + AnonSymbol->getName() + ")(r11)"); |
| else |
| OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) + |
| "-" + AnonSymbol->getName() + ")(r11)"); |
| OutStreamer.EmitRawText(StringRef("\tmtctr r12")); |
| OutStreamer.EmitRawText(StringRef("\tbctr")); |
| |
| OutStreamer.SwitchSection(LSPSection); |
| OutStreamer.EmitLabel(LazyPtr); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| if (isPPC64) |
| OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper")); |
| else |
| OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper")); |
| } |
| OutStreamer.AddBlankLine(); |
| return; |
| } |
| |
| const MCSection *StubSection = |
| OutContext.getMachOSection("__TEXT","__symbol_stub1", |
| MCSectionMachO::S_SYMBOL_STUBS | |
| MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, |
| 16, SectionKind::getText()); |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| MCSymbol *Stub = Stubs[i].first; |
| MCSymbol *RawSym = Stubs[i].second.getPointer(); |
| MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); |
| |
| OutStreamer.SwitchSection(StubSection); |
| EmitAlignment(4); |
| OutStreamer.EmitLabel(Stub); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| OutStreamer.EmitRawText("\tlis r11,ha16(" + Twine(LazyPtr->getName()) +")"); |
| if (isPPC64) |
| OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) + |
| ")(r11)"); |
| else |
| OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) + |
| ")(r11)"); |
| OutStreamer.EmitRawText(StringRef("\tmtctr r12")); |
| OutStreamer.EmitRawText(StringRef("\tbctr")); |
| OutStreamer.SwitchSection(LSPSection); |
| OutStreamer.EmitLabel(LazyPtr); |
| OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); |
| |
| if (isPPC64) |
| OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper")); |
| else |
| OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper")); |
| } |
| |
| OutStreamer.AddBlankLine(); |
| } |
| |
| |
| bool PPCDarwinAsmPrinter::doFinalization(Module &M) { |
| bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64; |
| |
| // Darwin/PPC always uses mach-o. |
| const TargetLoweringObjectFileMachO &TLOFMacho = |
| static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); |
| MachineModuleInfoMachO &MMIMacho = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>(); |
| |
| MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList(); |
| if (!Stubs.empty()) |
| EmitFunctionStubs(Stubs); |
| |
| if (MAI->doesSupportExceptionHandling() && MMI) { |
| // Add the (possibly multiple) personalities to the set of global values. |
| // Only referenced functions get into the Personalities list. |
| const std::vector<const Function*> &Personalities = MMI->getPersonalities(); |
| for (std::vector<const Function*>::const_iterator I = Personalities.begin(), |
| E = Personalities.end(); I != E; ++I) { |
| if (*I) { |
| MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| MMIMacho.getGVStubEntry(NLPSym); |
| StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true); |
| } |
| } |
| } |
| |
| // Output stubs for dynamically-linked functions. |
| Stubs = MMIMacho.GetGVStubList(); |
| |
| // Output macho stubs for external and common global variables. |
| if (!Stubs.empty()) { |
| // Switch with ".non_lazy_symbol_pointer" directive. |
| OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection()); |
| EmitAlignment(isPPC64 ? 3 : 2); |
| |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stubs[i].first); |
| // .indirect_symbol _foo |
| MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second; |
| OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol); |
| |
| if (MCSym.getInt()) |
| // External to current translation unit. |
| OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/); |
| else |
| // Internal to current translation unit. |
| // |
| // When we place the LSDA into the TEXT section, the type info pointers |
| // need to be indirect and pc-rel. We accomplish this by using NLPs. |
| // However, sometimes the types are local to the file. So we need to |
| // fill in the value for the NLP in those cases. |
| OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(), |
| OutContext), |
| isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| Stubs = MMIMacho.GetHiddenGVStubList(); |
| if (!Stubs.empty()) { |
| OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); |
| EmitAlignment(isPPC64 ? 3 : 2); |
| |
| for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stubs[i].first); |
| // .long _foo |
| OutStreamer.EmitValue(MCSymbolRefExpr:: |
| Create(Stubs[i].second.getPointer(), |
| OutContext), |
| isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| // Funny Darwin hack: This flag tells the linker that no global symbols |
| // contain code that falls through to other global symbols (e.g. the obvious |
| // implementation of multiple entry points). If this doesn't occur, the |
| // linker can safely perform dead code stripping. Since LLVM never generates |
| // code that does this, it is always safe to set. |
| OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols); |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code |
| /// for a MachineFunction to the given output stream, in a format that the |
| /// Darwin assembler can deal with. |
| /// |
| static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm, |
| MCStreamer &Streamer) { |
| const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>(); |
| |
| if (Subtarget->isDarwin()) |
| return new PPCDarwinAsmPrinter(tm, Streamer); |
| return new PPCLinuxAsmPrinter(tm, Streamer); |
| } |
| |
| // Force static initialization. |
| extern "C" void LLVMInitializePowerPCAsmPrinter() { |
| TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass); |
| TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass); |
| } |
