| //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and 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 "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Assembly/Writer.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/DwarfWriter.h" |
| #include "llvm/CodeGen/MachineDebugInfo.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/Support/Mangler.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/Visibility.h" |
| #include "llvm/Target/MRegisterInfo.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/Target/TargetOptions.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include <iostream> |
| #include <set> |
| using namespace llvm; |
| |
| namespace { |
| Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed"); |
| |
| class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter { |
| public: |
| std::set<std::string> FnStubs, GVStubs; |
| |
| PPCAsmPrinter(std::ostream &O, TargetMachine &TM) |
| : AsmPrinter(O, TM) {} |
| |
| virtual const char *getPassName() const { |
| return "PowerPC Assembly Printer"; |
| } |
| |
| PPCTargetMachine &getTM() { |
| return static_cast<PPCTargetMachine&>(TM); |
| } |
| |
| unsigned enumRegToMachineReg(unsigned enumReg) { |
| switch (enumReg) { |
| default: assert(0 && "Unhandled register!"); break; |
| case PPC::CR0: return 0; |
| case PPC::CR1: return 1; |
| case PPC::CR2: return 2; |
| case PPC::CR3: return 3; |
| case PPC::CR4: return 4; |
| case PPC::CR5: return 5; |
| case PPC::CR6: return 6; |
| case PPC::CR7: return 7; |
| } |
| abort(); |
| } |
| |
| /// printInstruction - This method is automatically generated by tablegen |
| /// from the instruction set description. This method returns true if the |
| /// machine instruction was sufficiently described to print it, otherwise it |
| /// returns false. |
| bool printInstruction(const MachineInstr *MI); |
| |
| void printMachineInstruction(const MachineInstr *MI); |
| void printOp(const MachineOperand &MO); |
| |
| void printOperand(const MachineInstr *MI, unsigned OpNo) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| if (MO.isRegister()) { |
| assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??"); |
| O << TM.getRegisterInfo()->get(MO.getReg()).Name; |
| } else if (MO.isImmediate()) { |
| O << MO.getImmedValue(); |
| } else { |
| printOp(MO); |
| } |
| } |
| |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode); |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode); |
| |
| |
| void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| char value = MI->getOperand(OpNo).getImmedValue(); |
| value = (value << (32-5)) >> (32-5); |
| O << (int)value; |
| } |
| void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| unsigned char value = MI->getOperand(OpNo).getImmedValue(); |
| assert(value <= 31 && "Invalid u5imm argument!"); |
| O << (unsigned int)value; |
| } |
| void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| unsigned char value = MI->getOperand(OpNo).getImmedValue(); |
| assert(value <= 63 && "Invalid u6imm argument!"); |
| O << (unsigned int)value; |
| } |
| void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (short)MI->getOperand(OpNo).getImmedValue(); |
| } |
| void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); |
| } |
| void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (short)(MI->getOperand(OpNo).getImmedValue()*4); |
| } |
| void printBranchOperand(const MachineInstr *MI, unsigned OpNo) { |
| // Branches can take an immediate operand. This is used by the branch |
| // selection pass to print $+8, an eight byte displacement from the PC. |
| if (MI->getOperand(OpNo).isImmediate()) { |
| O << "$+" << MI->getOperand(OpNo).getImmedValue(); |
| } else { |
| printOp(MI->getOperand(OpNo)); |
| } |
| } |
| void printCallOperand(const MachineInstr *MI, unsigned OpNo) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| if (TM.getRelocationModel() != Reloc::Static) { |
| if (MO.getType() == MachineOperand::MO_GlobalAddress) { |
| GlobalValue *GV = MO.getGlobal(); |
| if (((GV->isExternal() || GV->hasWeakLinkage() || |
| GV->hasLinkOnceLinkage()))) { |
| // Dynamically-resolved functions need a stub for the function. |
| std::string Name = Mang->getValueName(GV); |
| FnStubs.insert(Name); |
| O << "L" << Name << "$stub"; |
| return; |
| } |
| } |
| if (MO.getType() == MachineOperand::MO_ExternalSymbol) { |
| std::string Name(GlobalPrefix); Name += MO.getSymbolName(); |
| FnStubs.insert(Name); |
| O << "L" << Name << "$stub"; |
| return; |
| } |
| } |
| |
| printOp(MI->getOperand(OpNo)); |
| } |
| void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) { |
| O << (int)MI->getOperand(OpNo).getImmedValue()*4; |
| } |
| void printPICLabel(const MachineInstr *MI, unsigned OpNo) { |
| O << "\"L" << getFunctionNumber() << "$pb\"\n"; |
| O << "\"L" << getFunctionNumber() << "$pb\":"; |
| } |
| void printSymbolHi(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) { |
| printS16ImmOperand(MI, OpNo); |
| } else { |
| O << "ha16("; |
| printOp(MI->getOperand(OpNo)); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| O << "-\"L" << getFunctionNumber() << "$pb\")"; |
| else |
| O << ')'; |
| } |
| } |
| void printSymbolLo(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) { |
| printS16ImmOperand(MI, OpNo); |
| } else { |
| O << "lo16("; |
| printOp(MI->getOperand(OpNo)); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| O << "-\"L" << getFunctionNumber() << "$pb\")"; |
| else |
| O << ')'; |
| } |
| } |
| void printcrbitm(const MachineInstr *MI, unsigned OpNo) { |
| unsigned CCReg = MI->getOperand(OpNo).getReg(); |
| unsigned RegNo = enumRegToMachineReg(CCReg); |
| O << (0x80 >> RegNo); |
| } |
| // The new addressing mode printers. |
| void printMemRegImm(const MachineInstr *MI, unsigned OpNo) { |
| printSymbolLo(MI, OpNo); |
| O << '('; |
| if (MI->getOperand(OpNo+1).isRegister() && |
| MI->getOperand(OpNo+1).getReg() == PPC::R0) |
| O << "0"; |
| else |
| printOperand(MI, OpNo+1); |
| O << ')'; |
| } |
| void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) { |
| if (MI->getOperand(OpNo).isImmediate()) |
| printS16X4ImmOperand(MI, OpNo); |
| else |
| printSymbolLo(MI, OpNo); |
| O << '('; |
| if (MI->getOperand(OpNo+1).isRegister() && |
| MI->getOperand(OpNo+1).getReg() == PPC::R0) |
| O << "0"; |
| else |
| printOperand(MI, OpNo+1); |
| O << ')'; |
| } |
| |
| void printMemRegReg(const MachineInstr *MI, unsigned OpNo) { |
| // When used as the base register, r0 reads constant zero rather than |
| // the value contained in the register. For this reason, the darwin |
| // assembler requires that we print r0 as 0 (no r) when used as the base. |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| if (MO.getReg() == PPC::R0) |
| O << '0'; |
| else |
| O << TM.getRegisterInfo()->get(MO.getReg()).Name; |
| O << ", "; |
| printOperand(MI, OpNo+1); |
| } |
| |
| virtual bool runOnMachineFunction(MachineFunction &F) = 0; |
| virtual bool doFinalization(Module &M) = 0; |
| |
| }; |
| |
| /// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X |
| /// |
| struct VISIBILITY_HIDDEN DarwinDwarfWriter : public DwarfWriter { |
| // Ctor. |
| DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap) |
| : DwarfWriter(o, ap) |
| { |
| needsSet = true; |
| DwarfAbbrevSection = ".section __DWARF,__debug_abbrev"; |
| DwarfInfoSection = ".section __DWARF,__debug_info"; |
| DwarfLineSection = ".section __DWARF,__debug_line"; |
| DwarfFrameSection = ".section __DWARF,__debug_frame"; |
| DwarfPubNamesSection = ".section __DWARF,__debug_pubnames"; |
| DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes"; |
| DwarfStrSection = ".section __DWARF,__debug_str"; |
| DwarfLocSection = ".section __DWARF,__debug_loc"; |
| DwarfARangesSection = ".section __DWARF,__debug_aranges"; |
| DwarfRangesSection = ".section __DWARF,__debug_ranges"; |
| DwarfMacInfoSection = ".section __DWARF,__debug_macinfo"; |
| TextSection = ".text"; |
| DataSection = ".data"; |
| } |
| }; |
| |
| /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS |
| /// X |
| struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { |
| |
| DarwinDwarfWriter DW; |
| |
| DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM) |
| : PPCAsmPrinter(O, TM), DW(O, this) { |
| bool isPPC64 = TM.getSubtargetImpl()->isPPC64(); |
| CommentString = ";"; |
| GlobalPrefix = "_"; |
| PrivateGlobalPrefix = "L"; // Marker for constant pool idxs |
| ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. |
| if (isPPC64) |
| Data64bitsDirective = ".quad\t"; // we can't emit a 64-bit unit |
| else |
| Data64bitsDirective = 0; // we can't emit a 64-bit unit |
| AlignmentIsInBytes = false; // Alignment is by power of 2. |
| ConstantPoolSection = "\t.const\t"; |
| // FIXME: Conditionalize jump table section based on PIC |
| JumpTableSection = ".const"; |
| LCOMMDirective = "\t.lcomm\t"; |
| StaticCtorsSection = ".mod_init_func"; |
| StaticDtorsSection = ".mod_term_func"; |
| InlineAsmStart = "# InlineAsm Start"; |
| InlineAsmEnd = "# InlineAsm End"; |
| } |
| |
| virtual const char *getPassName() const { |
| return "Darwin PPC Assembly Printer"; |
| } |
| |
| bool runOnMachineFunction(MachineFunction &F); |
| bool doInitialization(Module &M); |
| bool doFinalization(Module &M); |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.setPreservesAll(); |
| AU.addRequired<MachineDebugInfo>(); |
| PPCAsmPrinter::getAnalysisUsage(AU); |
| } |
| |
| }; |
| } // end of anonymous namespace |
| |
| /// createDarwinAsmPrinterPass - 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. |
| /// |
| FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, |
| PPCTargetMachine &tm) { |
| return new DarwinAsmPrinter(o, tm); |
| } |
| |
| // Include the auto-generated portion of the assembly writer |
| #include "PPCGenAsmWriter.inc" |
| |
| void PPCAsmPrinter::printOp(const MachineOperand &MO) { |
| switch (MO.getType()) { |
| case MachineOperand::MO_Immediate: |
| std::cerr << "printOp() does not handle immediate values\n"; |
| abort(); |
| return; |
| |
| case MachineOperand::MO_MachineBasicBlock: |
| printBasicBlockLabel(MO.getMachineBasicBlock()); |
| return; |
| case MachineOperand::MO_JumpTableIndex: |
| O << PrivateGlobalPrefix << "JTI" << getFunctionNumber() |
| << '_' << MO.getJumpTableIndex(); |
| // FIXME: PIC relocation model |
| return; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() |
| << '_' << MO.getConstantPoolIndex(); |
| return; |
| case MachineOperand::MO_ExternalSymbol: |
| // Computing the address of an external symbol, not calling it. |
| if (TM.getRelocationModel() != Reloc::Static) { |
| std::string Name(GlobalPrefix); Name += MO.getSymbolName(); |
| GVStubs.insert(Name); |
| O << "L" << Name << "$non_lazy_ptr"; |
| return; |
| } |
| O << GlobalPrefix << MO.getSymbolName(); |
| return; |
| case MachineOperand::MO_GlobalAddress: { |
| // Computing the address of a global symbol, not calling it. |
| GlobalValue *GV = MO.getGlobal(); |
| std::string Name = Mang->getValueName(GV); |
| int offset = MO.getOffset(); |
| |
| // External or weakly linked global variables need non-lazily-resolved stubs |
| if (TM.getRelocationModel() != Reloc::Static) { |
| if (((GV->isExternal() || GV->hasWeakLinkage() || |
| GV->hasLinkOnceLinkage()))) { |
| GVStubs.insert(Name); |
| O << "L" << Name << "$non_lazy_ptr"; |
| return; |
| } |
| } |
| |
| O << Name; |
| 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) { |
| // 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 'L': // Write second word of DImode reference. |
| // Verify that this operand has two consecutive registers. |
| if (!MI->getOperand(OpNo).isRegister() || |
| OpNo+1 == MI->getNumOperands() || |
| !MI->getOperand(OpNo+1).isRegister()) |
| return true; |
| ++OpNo; // Return the high-part. |
| break; |
| } |
| } |
| |
| printOperand(MI, OpNo); |
| return false; |
| } |
| |
| bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| if (ExtraCode && ExtraCode[0]) |
| return true; // Unknown modifier. |
| printMemRegReg(MI, OpNo); |
| return false; |
| } |
| |
| /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to |
| /// the current output stream. |
| /// |
| void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { |
| ++EmittedInsts; |
| |
| // Check for slwi/srwi mnemonics. |
| if (MI->getOpcode() == PPC::RLWINM) { |
| bool FoundMnemonic = false; |
| unsigned char SH = MI->getOperand(2).getImmedValue(); |
| unsigned char MB = MI->getOperand(3).getImmedValue(); |
| unsigned char ME = MI->getOperand(4).getImmedValue(); |
| if (SH <= 31 && MB == 0 && ME == (31-SH)) { |
| O << "slwi "; FoundMnemonic = true; |
| } |
| if (SH <= 31 && MB == (32-SH) && ME == 31) { |
| O << "srwi "; FoundMnemonic = true; |
| SH = 32-SH; |
| } |
| if (FoundMnemonic) { |
| printOperand(MI, 0); |
| O << ", "; |
| printOperand(MI, 1); |
| O << ", " << (unsigned int)SH << "\n"; |
| return; |
| } |
| } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { |
| if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { |
| O << "mr "; |
| printOperand(MI, 0); |
| O << ", "; |
| printOperand(MI, 1); |
| O << "\n"; |
| return; |
| } |
| } |
| |
| if (printInstruction(MI)) |
| return; // Printer was automatically generated |
| |
| assert(0 && "Unhandled instruction in asm writer!"); |
| abort(); |
| return; |
| } |
| |
| /// runOnMachineFunction - This uses the printMachineInstruction() |
| /// method to print assembly for each instruction. |
| /// |
| bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); |
| |
| SetupMachineFunction(MF); |
| O << "\n\n"; |
| |
| // Print out constants referenced by the function |
| EmitConstantPool(MF.getConstantPool()); |
| |
| // Print out jump tables referenced by the function |
| EmitJumpTableInfo(MF.getJumpTableInfo()); |
| |
| // Print out labels for the function. |
| const Function *F = MF.getFunction(); |
| switch (F->getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::InternalLinkage: // Symbols default to internal. |
| SwitchToTextSection("\t.text", F); |
| break; |
| case Function::ExternalLinkage: |
| SwitchToTextSection("\t.text", F); |
| O << "\t.globl\t" << CurrentFnName << "\n"; |
| break; |
| case Function::WeakLinkage: |
| case Function::LinkOnceLinkage: |
| SwitchToTextSection( |
| ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F); |
| O << "\t.globl\t" << CurrentFnName << "\n"; |
| O << "\t.weak_definition\t" << CurrentFnName << "\n"; |
| break; |
| } |
| EmitAlignment(4, F); |
| O << CurrentFnName << ":\n"; |
| |
| // Emit pre-function debug information. |
| DW.BeginFunction(&MF); |
| |
| // Print out code for the function. |
| for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); |
| I != E; ++I) { |
| // Print a label for the basic block. |
| if (I != MF.begin()) { |
| printBasicBlockLabel(I, true); |
| O << '\n'; |
| } |
| for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); |
| II != E; ++II) { |
| // Print the assembly for the instruction. |
| O << "\t"; |
| printMachineInstruction(II); |
| } |
| } |
| |
| // Emit post-function debug information. |
| DW.EndFunction(); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| |
| bool DarwinAsmPrinter::doInitialization(Module &M) { |
| if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor()) |
| O << "\t.machine ppc970\n"; |
| AsmPrinter::doInitialization(M); |
| |
| // Darwin wants symbols to be quoted if they have complex names. |
| Mang->setUseQuotes(true); |
| |
| // Emit initial debug information. |
| DW.BeginModule(&M); |
| return false; |
| } |
| |
| bool DarwinAsmPrinter::doFinalization(Module &M) { |
| const TargetData *TD = TM.getTargetData(); |
| |
| // Print out module-level global variables here. |
| for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); |
| I != E; ++I) { |
| if (!I->hasInitializer()) continue; // External global require no code |
| |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (EmitSpecialLLVMGlobal(I)) |
| continue; |
| |
| std::string name = Mang->getValueName(I); |
| Constant *C = I->getInitializer(); |
| unsigned Size = TD->getTypeSize(C->getType()); |
| unsigned Align = getPreferredAlignmentLog(I); |
| |
| if (C->isNullValue() && /* FIXME: Verify correct */ |
| (I->hasInternalLinkage() || I->hasWeakLinkage() || |
| I->hasLinkOnceLinkage() || |
| (I->hasExternalLinkage() && !I->hasSection()))) { |
| if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. |
| if (I->hasExternalLinkage()) { |
| O << "\t.globl " << name << '\n'; |
| O << "\t.zerofill __DATA, __common, " << name << ", " |
| << Size << ", " << Align; |
| } else if (I->hasInternalLinkage()) { |
| SwitchToDataSection("\t.data", I); |
| O << LCOMMDirective << name << "," << Size << "," << Align; |
| } else { |
| SwitchToDataSection("\t.data", I); |
| O << ".comm " << name << "," << Size; |
| } |
| O << "\t\t; '" << I->getName() << "'\n"; |
| } else { |
| switch (I->getLinkage()) { |
| case GlobalValue::LinkOnceLinkage: |
| case GlobalValue::WeakLinkage: |
| O << "\t.globl " << name << '\n' |
| << "\t.weak_definition " << name << '\n'; |
| SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); |
| break; |
| case GlobalValue::AppendingLinkage: |
| // FIXME: appending linkage variables should go into a section of |
| // their name or something. For now, just emit them as external. |
| case GlobalValue::ExternalLinkage: |
| // If external or appending, declare as a global symbol |
| O << "\t.globl " << name << "\n"; |
| // FALL THROUGH |
| case GlobalValue::InternalLinkage: |
| SwitchToDataSection("\t.data", I); |
| break; |
| default: |
| std::cerr << "Unknown linkage type!"; |
| abort(); |
| } |
| |
| EmitAlignment(Align, I); |
| O << name << ":\t\t\t\t; '" << I->getName() << "'\n"; |
| EmitGlobalConstant(C); |
| O << '\n'; |
| } |
| } |
| |
| bool isPPC64 = TD->getPointerSizeInBits() == 64; |
| |
| // Output stubs for dynamically-linked functions |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," |
| "pure_instructions,32", 0); |
| EmitAlignment(4); |
| O << "L" << *i << "$stub:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| O << "\tmflr r0\n"; |
| O << "\tbcl 20,31,L0$" << *i << "\n"; |
| O << "L0$" << *i << ":\n"; |
| O << "\tmflr r11\n"; |
| O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; |
| O << "\tmtlr r0\n"; |
| if (isPPC64) |
| O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; |
| else |
| O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; |
| O << "\tmtctr r12\n"; |
| O << "\tbctr\n"; |
| SwitchToDataSection(".lazy_symbol_pointer", 0); |
| O << "L" << *i << "$lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| if (isPPC64) |
| O << "\t.quad dyld_stub_binding_helper\n"; |
| else |
| O << "\t.long dyld_stub_binding_helper\n"; |
| } |
| } else { |
| for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," |
| "pure_instructions,16", 0); |
| EmitAlignment(4); |
| O << "L" << *i << "$stub:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; |
| if (isPPC64) |
| O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; |
| else |
| O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; |
| O << "\tmtctr r12\n"; |
| O << "\tbctr\n"; |
| SwitchToDataSection(".lazy_symbol_pointer", 0); |
| O << "L" << *i << "$lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *i << "\n"; |
| if (isPPC64) |
| O << "\t.quad dyld_stub_binding_helper\n"; |
| else |
| O << "\t.long dyld_stub_binding_helper\n"; |
| } |
| } |
| |
| O << "\n"; |
| |
| // Output stubs for external and common global variables. |
| if (GVStubs.begin() != GVStubs.end()) { |
| SwitchToDataSection(".non_lazy_symbol_pointer", 0); |
| for (std::set<std::string>::iterator I = GVStubs.begin(), |
| E = GVStubs.end(); I != E; ++I) { |
| O << "L" << *I << "$non_lazy_ptr:\n"; |
| O << "\t.indirect_symbol " << *I << "\n"; |
| if (isPPC64) |
| O << "\t.quad\t0\n"; |
| else |
| O << "\t.long\t0\n"; |
| |
| } |
| } |
| |
| // Emit initial debug information. |
| DW.EndModule(); |
| |
| // 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. |
| O << "\t.subsections_via_symbols\n"; |
| |
| AsmPrinter::doFinalization(M); |
| return false; // success |
| } |
| |