PPCAsmPrinter.cpp revision b516e9b64850e0e1a50f680fd1443ac12e56557b
1//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 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'. 13// 14// Documentation at http://developer.apple.com/documentation/DeveloperTools/ 15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html 16// 17//===----------------------------------------------------------------------===// 18 19#define DEBUG_TYPE "asmprinter" 20#include "PPC.h" 21#include "InstPrinter/PPCInstPrinter.h" 22#include "MCTargetDesc/PPCPredicates.h" 23#include "PPCSubtarget.h" 24#include "PPCTargetMachine.h" 25#include "llvm/ADT/MapVector.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/StringExtras.h" 28#include "llvm/Assembly/Writer.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/DebugInfo.h" 36#include "llvm/IR/Constants.h" 37#include "llvm/IR/DerivedTypes.h" 38#include "llvm/IR/Module.h" 39#include "llvm/MC/MCAsmInfo.h" 40#include "llvm/MC/MCContext.h" 41#include "llvm/MC/MCExpr.h" 42#include "llvm/MC/MCInst.h" 43#include "llvm/MC/MCInstBuilder.h" 44#include "llvm/MC/MCSectionELF.h" 45#include "llvm/MC/MCSectionMachO.h" 46#include "llvm/MC/MCStreamer.h" 47#include "llvm/MC/MCSymbol.h" 48#include "llvm/Support/CommandLine.h" 49#include "llvm/Support/Debug.h" 50#include "llvm/Support/ELF.h" 51#include "llvm/Support/ErrorHandling.h" 52#include "llvm/Support/MathExtras.h" 53#include "llvm/Support/TargetRegistry.h" 54#include "llvm/Support/raw_ostream.h" 55#include "llvm/Target/Mangler.h" 56#include "llvm/Target/TargetInstrInfo.h" 57#include "llvm/Target/TargetOptions.h" 58#include "llvm/Target/TargetRegisterInfo.h" 59using namespace llvm; 60 61namespace { 62 class PPCAsmPrinter : public AsmPrinter { 63 protected: 64 MapVector<MCSymbol*, MCSymbol*> TOC; 65 const PPCSubtarget &Subtarget; 66 uint64_t TOCLabelID; 67 public: 68 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 69 : AsmPrinter(TM, Streamer), 70 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {} 71 72 virtual const char *getPassName() const { 73 return "PowerPC Assembly Printer"; 74 } 75 76 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym); 77 78 virtual void EmitInstruction(const MachineInstr *MI); 79 80 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O); 81 82 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 83 unsigned AsmVariant, const char *ExtraCode, 84 raw_ostream &O); 85 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 86 unsigned AsmVariant, const char *ExtraCode, 87 raw_ostream &O); 88 89 MachineLocation getDebugValueLocation(const MachineInstr *MI) const { 90 MachineLocation Location; 91 assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!"); 92 // Frame address. Currently handles register +- offset only. 93 if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm()) 94 Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm()); 95 else { 96 DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n"); 97 } 98 return Location; 99 } 100 }; 101 102 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux 103 class PPCLinuxAsmPrinter : public PPCAsmPrinter { 104 public: 105 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 106 : PPCAsmPrinter(TM, Streamer) {} 107 108 virtual const char *getPassName() const { 109 return "Linux PPC Assembly Printer"; 110 } 111 112 bool doFinalization(Module &M); 113 114 virtual void EmitFunctionEntryLabel(); 115 116 void EmitFunctionBodyEnd(); 117 }; 118 119 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac 120 /// OS X 121 class PPCDarwinAsmPrinter : public PPCAsmPrinter { 122 public: 123 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 124 : PPCAsmPrinter(TM, Streamer) {} 125 126 virtual const char *getPassName() const { 127 return "Darwin PPC Assembly Printer"; 128 } 129 130 bool doFinalization(Module &M); 131 void EmitStartOfAsmFile(Module &M); 132 133 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs); 134 }; 135} // end of anonymous namespace 136 137/// stripRegisterPrefix - This method strips the character prefix from a 138/// register name so that only the number is left. Used by for linux asm. 139static const char *stripRegisterPrefix(const char *RegName) { 140 switch (RegName[0]) { 141 case 'r': 142 case 'f': 143 case 'v': return RegName + 1; 144 case 'c': if (RegName[1] == 'r') return RegName + 2; 145 } 146 147 return RegName; 148} 149 150void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, 151 raw_ostream &O) { 152 const MachineOperand &MO = MI->getOperand(OpNo); 153 154 switch (MO.getType()) { 155 case MachineOperand::MO_Register: { 156 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg()); 157 // Linux assembler (Others?) does not take register mnemonics. 158 // FIXME - What about special registers used in mfspr/mtspr? 159 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); 160 O << RegName; 161 return; 162 } 163 case MachineOperand::MO_Immediate: 164 O << MO.getImm(); 165 return; 166 167 case MachineOperand::MO_MachineBasicBlock: 168 O << *MO.getMBB()->getSymbol(); 169 return; 170 case MachineOperand::MO_JumpTableIndex: 171 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 172 << '_' << MO.getIndex(); 173 // FIXME: PIC relocation model 174 return; 175 case MachineOperand::MO_ConstantPoolIndex: 176 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() 177 << '_' << MO.getIndex(); 178 return; 179 case MachineOperand::MO_BlockAddress: 180 O << *GetBlockAddressSymbol(MO.getBlockAddress()); 181 return; 182 case MachineOperand::MO_ExternalSymbol: { 183 // Computing the address of an external symbol, not calling it. 184 if (TM.getRelocationModel() == Reloc::Static) { 185 O << *GetExternalSymbolSymbol(MO.getSymbolName()); 186 return; 187 } 188 189 MCSymbol *NLPSym = 190 OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+ 191 MO.getSymbolName()+"$non_lazy_ptr"); 192 MachineModuleInfoImpl::StubValueTy &StubSym = 193 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym); 194 if (StubSym.getPointer() == 0) 195 StubSym = MachineModuleInfoImpl:: 196 StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true); 197 198 O << *NLPSym; 199 return; 200 } 201 case MachineOperand::MO_GlobalAddress: { 202 // Computing the address of a global symbol, not calling it. 203 const GlobalValue *GV = MO.getGlobal(); 204 MCSymbol *SymToPrint; 205 206 // External or weakly linked global variables need non-lazily-resolved stubs 207 if (TM.getRelocationModel() != Reloc::Static && 208 (GV->isDeclaration() || GV->isWeakForLinker())) { 209 if (!GV->hasHiddenVisibility()) { 210 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); 211 MachineModuleInfoImpl::StubValueTy &StubSym = 212 MMI->getObjFileInfo<MachineModuleInfoMachO>() 213 .getGVStubEntry(SymToPrint); 214 if (StubSym.getPointer() == 0) 215 StubSym = MachineModuleInfoImpl:: 216 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); 217 } else if (GV->isDeclaration() || GV->hasCommonLinkage() || 218 GV->hasAvailableExternallyLinkage()) { 219 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); 220 221 MachineModuleInfoImpl::StubValueTy &StubSym = 222 MMI->getObjFileInfo<MachineModuleInfoMachO>(). 223 getHiddenGVStubEntry(SymToPrint); 224 if (StubSym.getPointer() == 0) 225 StubSym = MachineModuleInfoImpl:: 226 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); 227 } else { 228 SymToPrint = Mang->getSymbol(GV); 229 } 230 } else { 231 SymToPrint = Mang->getSymbol(GV); 232 } 233 234 O << *SymToPrint; 235 236 printOffset(MO.getOffset(), O); 237 return; 238 } 239 240 default: 241 O << "<unknown operand type: " << MO.getType() << ">"; 242 return; 243 } 244} 245 246/// PrintAsmOperand - Print out an operand for an inline asm expression. 247/// 248bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 249 unsigned AsmVariant, 250 const char *ExtraCode, raw_ostream &O) { 251 // Does this asm operand have a single letter operand modifier? 252 if (ExtraCode && ExtraCode[0]) { 253 if (ExtraCode[1] != 0) return true; // Unknown modifier. 254 255 switch (ExtraCode[0]) { 256 default: 257 // See if this is a generic print operand 258 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O); 259 case 'c': // Don't print "$" before a global var name or constant. 260 break; // PPC never has a prefix. 261 case 'L': // Write second word of DImode reference. 262 // Verify that this operand has two consecutive registers. 263 if (!MI->getOperand(OpNo).isReg() || 264 OpNo+1 == MI->getNumOperands() || 265 !MI->getOperand(OpNo+1).isReg()) 266 return true; 267 ++OpNo; // Return the high-part. 268 break; 269 case 'I': 270 // Write 'i' if an integer constant, otherwise nothing. Used to print 271 // addi vs add, etc. 272 if (MI->getOperand(OpNo).isImm()) 273 O << "i"; 274 return false; 275 } 276 } 277 278 printOperand(MI, OpNo, O); 279 return false; 280} 281 282// At the moment, all inline asm memory operands are a single register. 283// In any case, the output of this routine should always be just one 284// assembler operand. 285 286bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 287 unsigned AsmVariant, 288 const char *ExtraCode, 289 raw_ostream &O) { 290 if (ExtraCode && ExtraCode[0]) { 291 if (ExtraCode[1] != 0) return true; // Unknown modifier. 292 293 switch (ExtraCode[0]) { 294 default: return true; // Unknown modifier. 295 case 'y': // A memory reference for an X-form instruction 296 { 297 const char *RegName = "r0"; 298 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); 299 O << RegName << ", "; 300 printOperand(MI, OpNo, O); 301 return false; 302 } 303 } 304 } 305 306 assert(MI->getOperand(OpNo).isReg()); 307 O << "0("; 308 printOperand(MI, OpNo, O); 309 O << ")"; 310 return false; 311} 312 313 314/// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry 315/// exists for it. If not, create one. Then return a symbol that references 316/// the TOC entry. 317MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) { 318 319 MCSymbol *&TOCEntry = TOC[Sym]; 320 321 // To avoid name clash check if the name already exists. 322 while (TOCEntry == 0) { 323 if (OutContext.LookupSymbol(Twine(MAI->getPrivateGlobalPrefix()) + 324 "C" + Twine(TOCLabelID++)) == 0) { 325 TOCEntry = GetTempSymbol("C", TOCLabelID); 326 } 327 } 328 329 return TOCEntry; 330} 331 332 333/// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to 334/// the current output stream. 335/// 336void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) { 337 MCInst TmpInst; 338 339 // Lower multi-instruction pseudo operations. 340 switch (MI->getOpcode()) { 341 default: break; 342 case TargetOpcode::DBG_VALUE: { 343 if (!isVerbose() || !OutStreamer.hasRawTextSupport()) return; 344 345 SmallString<32> Str; 346 raw_svector_ostream O(Str); 347 unsigned NOps = MI->getNumOperands(); 348 assert(NOps==4); 349 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: "; 350 // cast away const; DIetc do not take const operands for some reason. 351 DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata())); 352 O << V.getName(); 353 O << " <- "; 354 // Frame address. Currently handles register +- offset only. 355 assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm()); 356 O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O); 357 O << ']'; 358 O << "+"; 359 printOperand(MI, NOps-2, O); 360 OutStreamer.EmitRawText(O.str()); 361 return; 362 } 363 364 case PPC::MovePCtoLR: 365 case PPC::MovePCtoLR8: { 366 // Transform %LR = MovePCtoLR 367 // Into this, where the label is the PIC base: 368 // bl L1$pb 369 // L1$pb: 370 MCSymbol *PICBase = MF->getPICBaseSymbol(); 371 372 // Emit the 'bl'. 373 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL_Darwin) // Darwin vs SVR4 doesn't matter here. 374 // FIXME: We would like an efficient form for this, so we don't have to do 375 // a lot of extra uniquing. 376 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext))); 377 378 // Emit the label. 379 OutStreamer.EmitLabel(PICBase); 380 return; 381 } 382 case PPC::LDtocJTI: 383 case PPC::LDtocCPT: 384 case PPC::LDtoc: { 385 // Transform %X3 = LDtoc <ga:@min1>, %X2 386 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 387 388 // Change the opcode to LD, and the global address operand to be a 389 // reference to the TOC entry we will synthesize later. 390 TmpInst.setOpcode(PPC::LD); 391 const MachineOperand &MO = MI->getOperand(1); 392 393 // Map symbol -> label of TOC entry 394 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI()); 395 MCSymbol *MOSymbol = 0; 396 if (MO.isGlobal()) 397 MOSymbol = Mang->getSymbol(MO.getGlobal()); 398 else if (MO.isCPI()) 399 MOSymbol = GetCPISymbol(MO.getIndex()); 400 else if (MO.isJTI()) 401 MOSymbol = GetJTISymbol(MO.getIndex()); 402 403 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol); 404 405 const MCExpr *Exp = 406 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC_ENTRY, 407 OutContext); 408 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); 409 OutStreamer.EmitInstruction(TmpInst); 410 return; 411 } 412 413 case PPC::ADDIStocHA: { 414 // Transform %Xd = ADDIStocHA %X2, <ga:@sym> 415 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 416 417 // Change the opcode to ADDIS8. If the global address is external, 418 // has common linkage, is a function address, or is a jump table 419 // address, then generate a TOC entry and reference that. Otherwise 420 // reference the symbol directly. 421 TmpInst.setOpcode(PPC::ADDIS8); 422 const MachineOperand &MO = MI->getOperand(2); 423 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) && 424 "Invalid operand for ADDIStocHA!"); 425 MCSymbol *MOSymbol = 0; 426 bool IsExternal = false; 427 bool IsFunction = false; 428 bool IsCommon = false; 429 bool IsAvailExt = false; 430 431 if (MO.isGlobal()) { 432 const GlobalValue *GValue = MO.getGlobal(); 433 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue); 434 const GlobalValue *RealGValue = GAlias ? 435 GAlias->resolveAliasedGlobal(false) : GValue; 436 MOSymbol = Mang->getSymbol(RealGValue); 437 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue); 438 IsExternal = GVar && !GVar->hasInitializer(); 439 IsCommon = GVar && RealGValue->hasCommonLinkage(); 440 IsFunction = !GVar; 441 IsAvailExt = GVar && RealGValue->hasAvailableExternallyLinkage(); 442 } else if (MO.isCPI()) 443 MOSymbol = GetCPISymbol(MO.getIndex()); 444 else if (MO.isJTI()) 445 MOSymbol = GetJTISymbol(MO.getIndex()); 446 447 if (IsExternal || IsFunction || IsCommon || IsAvailExt || MO.isJTI()) 448 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); 449 450 const MCExpr *Exp = 451 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_HA, 452 OutContext); 453 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp); 454 OutStreamer.EmitInstruction(TmpInst); 455 return; 456 } 457 case PPC::LDtocL: { 458 // Transform %Xd = LDtocL <ga:@sym>, %Xs 459 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 460 461 // Change the opcode to LDrs, which is a form of LD with the offset 462 // specified by a SymbolLo. If the global address is external, has 463 // common linkage, or is a jump table address, then reference the 464 // associated TOC entry. Otherwise reference the symbol directly. 465 TmpInst.setOpcode(PPC::LDrs); 466 const MachineOperand &MO = MI->getOperand(1); 467 assert((MO.isGlobal() || MO.isJTI()) && "Invalid operand for LDtocL!"); 468 MCSymbol *MOSymbol = 0; 469 470 if (MO.isJTI()) 471 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex())); 472 else { 473 const GlobalValue *GValue = MO.getGlobal(); 474 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue); 475 const GlobalValue *RealGValue = GAlias ? 476 GAlias->resolveAliasedGlobal(false) : GValue; 477 MOSymbol = Mang->getSymbol(RealGValue); 478 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue); 479 480 if (!GVar || !GVar->hasInitializer() || RealGValue->hasCommonLinkage() || 481 RealGValue->hasAvailableExternallyLinkage()) 482 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); 483 } 484 485 const MCExpr *Exp = 486 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_LO, 487 OutContext); 488 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); 489 OutStreamer.EmitInstruction(TmpInst); 490 return; 491 } 492 case PPC::ADDItocL: { 493 // Transform %Xd = ADDItocL %Xs, <ga:@sym> 494 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 495 496 // Change the opcode to ADDI8L. If the global address is external, then 497 // generate a TOC entry and reference that. Otherwise reference the 498 // symbol directly. 499 TmpInst.setOpcode(PPC::ADDI8L); 500 const MachineOperand &MO = MI->getOperand(2); 501 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL"); 502 MCSymbol *MOSymbol = 0; 503 bool IsExternal = false; 504 bool IsFunction = false; 505 506 if (MO.isGlobal()) { 507 const GlobalValue *GValue = MO.getGlobal(); 508 const GlobalAlias *GAlias = dyn_cast<GlobalAlias>(GValue); 509 const GlobalValue *RealGValue = GAlias ? 510 GAlias->resolveAliasedGlobal(false) : GValue; 511 MOSymbol = Mang->getSymbol(RealGValue); 512 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(RealGValue); 513 IsExternal = GVar && !GVar->hasInitializer(); 514 IsFunction = !GVar; 515 } else if (MO.isCPI()) 516 MOSymbol = GetCPISymbol(MO.getIndex()); 517 518 if (IsFunction || IsExternal) 519 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol); 520 521 const MCExpr *Exp = 522 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC16_LO, 523 OutContext); 524 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp); 525 OutStreamer.EmitInstruction(TmpInst); 526 return; 527 } 528 case PPC::ADDISgotTprelHA: { 529 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym> 530 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha 531 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 532 const MachineOperand &MO = MI->getOperand(2); 533 const GlobalValue *GValue = MO.getGlobal(); 534 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 535 const MCExpr *SymGotTprel = 536 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA, 537 OutContext); 538 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8) 539 .addReg(MI->getOperand(0).getReg()) 540 .addReg(PPC::X2) 541 .addExpr(SymGotTprel)); 542 return; 543 } 544 case PPC::LDgotTprelL: { 545 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs 546 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 547 548 // Change the opcode to LDrs, which is a form of LD with the offset 549 // specified by a SymbolLo. 550 TmpInst.setOpcode(PPC::LDrs); 551 const MachineOperand &MO = MI->getOperand(1); 552 const GlobalValue *GValue = MO.getGlobal(); 553 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 554 const MCExpr *Exp = 555 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO, 556 OutContext); 557 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp); 558 OutStreamer.EmitInstruction(TmpInst); 559 return; 560 } 561 case PPC::ADDIStlsgdHA: { 562 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym> 563 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha 564 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 565 const MachineOperand &MO = MI->getOperand(2); 566 const GlobalValue *GValue = MO.getGlobal(); 567 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 568 const MCExpr *SymGotTlsGD = 569 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA, 570 OutContext); 571 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8) 572 .addReg(MI->getOperand(0).getReg()) 573 .addReg(PPC::X2) 574 .addExpr(SymGotTlsGD)); 575 return; 576 } 577 case PPC::ADDItlsgdL: { 578 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym> 579 // Into: %Xd = ADDI8L %Xs, sym@got@tlsgd@l 580 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 581 const MachineOperand &MO = MI->getOperand(2); 582 const GlobalValue *GValue = MO.getGlobal(); 583 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 584 const MCExpr *SymGotTlsGD = 585 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO, 586 OutContext); 587 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L) 588 .addReg(MI->getOperand(0).getReg()) 589 .addReg(MI->getOperand(1).getReg()) 590 .addExpr(SymGotTlsGD)); 591 return; 592 } 593 case PPC::GETtlsADDR: { 594 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym> 595 // Into: BL8_NOP_ELF_TLSGD __tls_get_addr(sym@tlsgd) 596 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 597 598 StringRef Name = "__tls_get_addr"; 599 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name); 600 const MCSymbolRefExpr *TlsRef = 601 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext); 602 const MachineOperand &MO = MI->getOperand(2); 603 const GlobalValue *GValue = MO.getGlobal(); 604 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 605 const MCExpr *SymVar = 606 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD, 607 OutContext); 608 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_ELF_TLSGD) 609 .addExpr(TlsRef) 610 .addExpr(SymVar)); 611 return; 612 } 613 case PPC::ADDIStlsldHA: { 614 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym> 615 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha 616 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 617 const MachineOperand &MO = MI->getOperand(2); 618 const GlobalValue *GValue = MO.getGlobal(); 619 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 620 const MCExpr *SymGotTlsLD = 621 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA, 622 OutContext); 623 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8) 624 .addReg(MI->getOperand(0).getReg()) 625 .addReg(PPC::X2) 626 .addExpr(SymGotTlsLD)); 627 return; 628 } 629 case PPC::ADDItlsldL: { 630 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym> 631 // Into: %Xd = ADDI8L %Xs, sym@got@tlsld@l 632 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 633 const MachineOperand &MO = MI->getOperand(2); 634 const GlobalValue *GValue = MO.getGlobal(); 635 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 636 const MCExpr *SymGotTlsLD = 637 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO, 638 OutContext); 639 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L) 640 .addReg(MI->getOperand(0).getReg()) 641 .addReg(MI->getOperand(1).getReg()) 642 .addExpr(SymGotTlsLD)); 643 return; 644 } 645 case PPC::GETtlsldADDR: { 646 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym> 647 // Into: BL8_NOP_ELF_TLSLD __tls_get_addr(sym@tlsld) 648 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 649 650 StringRef Name = "__tls_get_addr"; 651 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name); 652 const MCSymbolRefExpr *TlsRef = 653 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext); 654 const MachineOperand &MO = MI->getOperand(2); 655 const GlobalValue *GValue = MO.getGlobal(); 656 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 657 const MCExpr *SymVar = 658 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD, 659 OutContext); 660 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BL8_NOP_ELF_TLSLD) 661 .addExpr(TlsRef) 662 .addExpr(SymVar)); 663 return; 664 } 665 case PPC::ADDISdtprelHA: { 666 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym> 667 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha 668 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 669 const MachineOperand &MO = MI->getOperand(2); 670 const GlobalValue *GValue = MO.getGlobal(); 671 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 672 const MCExpr *SymDtprel = 673 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL16_HA, 674 OutContext); 675 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS8) 676 .addReg(MI->getOperand(0).getReg()) 677 .addReg(PPC::X3) 678 .addExpr(SymDtprel)); 679 return; 680 } 681 case PPC::ADDIdtprelL: { 682 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym> 683 // Into: %Xd = ADDI8L %Xs, sym@dtprel@l 684 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC"); 685 const MachineOperand &MO = MI->getOperand(2); 686 const GlobalValue *GValue = MO.getGlobal(); 687 MCSymbol *MOSymbol = Mang->getSymbol(GValue); 688 const MCExpr *SymDtprel = 689 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL16_LO, 690 OutContext); 691 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDI8L) 692 .addReg(MI->getOperand(0).getReg()) 693 .addReg(MI->getOperand(1).getReg()) 694 .addExpr(SymDtprel)); 695 return; 696 } 697 case PPC::MFCRpseud: 698 case PPC::MFCR8pseud: 699 // Transform: %R3 = MFCRpseud %CR7 700 // Into: %R3 = MFCR ;; cr7 701 OutStreamer.AddComment(PPCInstPrinter:: 702 getRegisterName(MI->getOperand(1).getReg())); 703 OutStreamer.EmitInstruction(MCInstBuilder(Subtarget.isPPC64() ? PPC::MFCR8 : PPC::MFCR) 704 .addReg(MI->getOperand(0).getReg())); 705 return; 706 case PPC::SYNC: 707 // In Book E sync is called msync, handle this special case here... 708 if (Subtarget.isBookE()) { 709 OutStreamer.EmitRawText(StringRef("\tmsync")); 710 return; 711 } 712 } 713 714 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin()); 715 OutStreamer.EmitInstruction(TmpInst); 716} 717 718void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() { 719 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label. 720 return AsmPrinter::EmitFunctionEntryLabel(); 721 722 // Emit an official procedure descriptor. 723 const MCSection *Current = OutStreamer.getCurrentSection(); 724 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd", 725 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, 726 SectionKind::getReadOnly()); 727 OutStreamer.SwitchSection(Section); 728 OutStreamer.EmitLabel(CurrentFnSym); 729 OutStreamer.EmitValueToAlignment(8); 730 MCSymbol *Symbol1 = 731 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName())); 732 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function 733 // entry point. 734 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext), 735 8 /*size*/); 736 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC.")); 737 // Generates a R_PPC64_TOC relocation for TOC base insertion. 738 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2, 739 MCSymbolRefExpr::VK_PPC_TOC, OutContext), 740 8/*size*/); 741 // Emit a null environment pointer. 742 OutStreamer.EmitIntValue(0, 8 /* size */); 743 OutStreamer.SwitchSection(Current); 744 745 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol( 746 ".L." + Twine(CurrentFnSym->getName())); 747 OutStreamer.EmitLabel(RealFnSym); 748 CurrentFnSymForSize = RealFnSym; 749} 750 751 752bool PPCLinuxAsmPrinter::doFinalization(Module &M) { 753 const DataLayout *TD = TM.getDataLayout(); 754 755 bool isPPC64 = TD->getPointerSizeInBits() == 64; 756 757 if (isPPC64 && !TOC.empty()) { 758 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc", 759 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC, 760 SectionKind::getReadOnly()); 761 OutStreamer.SwitchSection(Section); 762 763 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(), 764 E = TOC.end(); I != E; ++I) { 765 OutStreamer.EmitLabel(I->second); 766 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName()); 767 OutStreamer.EmitTCEntry(*S); 768 } 769 } 770 771 MachineModuleInfoELF &MMIELF = 772 MMI->getObjFileInfo<MachineModuleInfoELF>(); 773 774 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList(); 775 if (!Stubs.empty()) { 776 OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); 777 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 778 // L_foo$stub: 779 OutStreamer.EmitLabel(Stubs[i].first); 780 // .long _foo 781 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(), 782 OutContext), 783 isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/); 784 } 785 786 Stubs.clear(); 787 OutStreamer.AddBlankLine(); 788 } 789 790 return AsmPrinter::doFinalization(M); 791} 792 793/// EmitFunctionBodyEnd - Print the traceback table before the .size 794/// directive. 795/// 796void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() { 797 // Only the 64-bit target requires a traceback table. For now, 798 // we only emit the word of zeroes that GDB requires to find 799 // the end of the function, and zeroes for the eight-byte 800 // mandatory fields. 801 // FIXME: We should fill in the eight-byte mandatory fields as described in 802 // the PPC64 ELF ABI (this is a low-priority item because GDB does not 803 // currently make use of these fields). 804 if (Subtarget.isPPC64()) { 805 OutStreamer.EmitIntValue(0, 4/*size*/); 806 OutStreamer.EmitIntValue(0, 8/*size*/); 807 } 808} 809 810void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) { 811 static const char *const CPUDirectives[] = { 812 "", 813 "ppc", 814 "ppc440", 815 "ppc601", 816 "ppc602", 817 "ppc603", 818 "ppc7400", 819 "ppc750", 820 "ppc970", 821 "ppcA2", 822 "ppce500mc", 823 "ppce5500", 824 "power3", 825 "power4", 826 "power5", 827 "power5x", 828 "power6", 829 "power6x", 830 "power7", 831 "ppc64" 832 }; 833 834 unsigned Directive = Subtarget.getDarwinDirective(); 835 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970) 836 Directive = PPC::DIR_970; 837 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400) 838 Directive = PPC::DIR_7400; 839 if (Subtarget.isPPC64() && Directive < PPC::DIR_64) 840 Directive = PPC::DIR_64; 841 assert(Directive <= PPC::DIR_64 && "Directive out of range."); 842 843 // FIXME: This is a total hack, finish mc'izing the PPC backend. 844 if (OutStreamer.hasRawTextSupport()) 845 OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive])); 846 847 // Prime text sections so they are adjacent. This reduces the likelihood a 848 // large data or debug section causes a branch to exceed 16M limit. 849 const TargetLoweringObjectFileMachO &TLOFMacho = 850 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); 851 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection()); 852 if (TM.getRelocationModel() == Reloc::PIC_) { 853 OutStreamer.SwitchSection( 854 OutContext.getMachOSection("__TEXT", "__picsymbolstub1", 855 MCSectionMachO::S_SYMBOL_STUBS | 856 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 857 32, SectionKind::getText())); 858 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) { 859 OutStreamer.SwitchSection( 860 OutContext.getMachOSection("__TEXT","__symbol_stub1", 861 MCSectionMachO::S_SYMBOL_STUBS | 862 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 863 16, SectionKind::getText())); 864 } 865 OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); 866} 867 868static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) { 869 // Remove $stub suffix, add $lazy_ptr. 870 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5); 871 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr"); 872} 873 874static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) { 875 // Add $tmp suffix to $stub, yielding $stub$tmp. 876 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp"); 877} 878 879void PPCDarwinAsmPrinter:: 880EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) { 881 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64; 882 883 const TargetLoweringObjectFileMachO &TLOFMacho = 884 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); 885 886 // .lazy_symbol_pointer 887 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection(); 888 889 // Output stubs for dynamically-linked functions 890 if (TM.getRelocationModel() == Reloc::PIC_) { 891 const MCSection *StubSection = 892 OutContext.getMachOSection("__TEXT", "__picsymbolstub1", 893 MCSectionMachO::S_SYMBOL_STUBS | 894 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 895 32, SectionKind::getText()); 896 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 897 OutStreamer.SwitchSection(StubSection); 898 EmitAlignment(4); 899 900 MCSymbol *Stub = Stubs[i].first; 901 MCSymbol *RawSym = Stubs[i].second.getPointer(); 902 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); 903 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext); 904 905 OutStreamer.EmitLabel(Stub); 906 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); 907 908 // mflr r0 909 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0)); 910 // FIXME: MCize this. 911 OutStreamer.EmitRawText("\tbcl 20, 31, " + Twine(AnonSymbol->getName())); 912 OutStreamer.EmitLabel(AnonSymbol); 913 // mflr r11 914 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11)); 915 // addis r11, r11, ha16(LazyPtr - AnonSymbol) 916 const MCExpr *Sub = 917 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(LazyPtr, OutContext), 918 MCSymbolRefExpr::Create(AnonSymbol, OutContext), 919 OutContext); 920 OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS) 921 .addReg(PPC::R11) 922 .addReg(PPC::R11) 923 .addExpr(Sub)); 924 // mtlr r0 925 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0)); 926 927 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11) 928 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11) 929 OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU) 930 .addReg(PPC::R12) 931 .addExpr(Sub).addExpr(Sub) 932 .addReg(PPC::R11)); 933 // mtctr r12 934 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12)); 935 // bctr 936 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR)); 937 938 OutStreamer.SwitchSection(LSPSection); 939 OutStreamer.EmitLabel(LazyPtr); 940 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); 941 942 MCSymbol *DyldStubBindingHelper = 943 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper")); 944 if (isPPC64) { 945 // .quad dyld_stub_binding_helper 946 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8); 947 } else { 948 // .long dyld_stub_binding_helper 949 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4); 950 } 951 } 952 OutStreamer.AddBlankLine(); 953 return; 954 } 955 956 const MCSection *StubSection = 957 OutContext.getMachOSection("__TEXT","__symbol_stub1", 958 MCSectionMachO::S_SYMBOL_STUBS | 959 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 960 16, SectionKind::getText()); 961 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 962 MCSymbol *Stub = Stubs[i].first; 963 MCSymbol *RawSym = Stubs[i].second.getPointer(); 964 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext); 965 966 OutStreamer.SwitchSection(StubSection); 967 EmitAlignment(4); 968 OutStreamer.EmitLabel(Stub); 969 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); 970 // lis r11, ha16(LazyPtr) 971 const MCExpr *LazyPtrHa16 = 972 MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_HA16, 973 OutContext); 974 OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS) 975 .addReg(PPC::R11) 976 .addExpr(LazyPtrHa16)); 977 978 const MCExpr *LazyPtrLo16 = 979 MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_LO16, 980 OutContext); 981 // ldu r12, lo16(LazyPtr)(r11) 982 // lwzu r12, lo16(LazyPtr)(r11) 983 OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU) 984 .addReg(PPC::R12) 985 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16) 986 .addReg(PPC::R11)); 987 988 // mtctr r12 989 OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12)); 990 // bctr 991 OutStreamer.EmitInstruction(MCInstBuilder(PPC::BCTR)); 992 993 OutStreamer.SwitchSection(LSPSection); 994 OutStreamer.EmitLabel(LazyPtr); 995 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol); 996 997 MCSymbol *DyldStubBindingHelper = 998 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper")); 999 if (isPPC64) { 1000 // .quad dyld_stub_binding_helper 1001 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8); 1002 } else { 1003 // .long dyld_stub_binding_helper 1004 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4); 1005 } 1006 } 1007 1008 OutStreamer.AddBlankLine(); 1009} 1010 1011 1012bool PPCDarwinAsmPrinter::doFinalization(Module &M) { 1013 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64; 1014 1015 // Darwin/PPC always uses mach-o. 1016 const TargetLoweringObjectFileMachO &TLOFMacho = 1017 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering()); 1018 MachineModuleInfoMachO &MMIMacho = 1019 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 1020 1021 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList(); 1022 if (!Stubs.empty()) 1023 EmitFunctionStubs(Stubs); 1024 1025 if (MAI->doesSupportExceptionHandling() && MMI) { 1026 // Add the (possibly multiple) personalities to the set of global values. 1027 // Only referenced functions get into the Personalities list. 1028 const std::vector<const Function*> &Personalities = MMI->getPersonalities(); 1029 for (std::vector<const Function*>::const_iterator I = Personalities.begin(), 1030 E = Personalities.end(); I != E; ++I) { 1031 if (*I) { 1032 MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr"); 1033 MachineModuleInfoImpl::StubValueTy &StubSym = 1034 MMIMacho.getGVStubEntry(NLPSym); 1035 StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true); 1036 } 1037 } 1038 } 1039 1040 // Output stubs for dynamically-linked functions. 1041 Stubs = MMIMacho.GetGVStubList(); 1042 1043 // Output macho stubs for external and common global variables. 1044 if (!Stubs.empty()) { 1045 // Switch with ".non_lazy_symbol_pointer" directive. 1046 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection()); 1047 EmitAlignment(isPPC64 ? 3 : 2); 1048 1049 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 1050 // L_foo$stub: 1051 OutStreamer.EmitLabel(Stubs[i].first); 1052 // .indirect_symbol _foo 1053 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second; 1054 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol); 1055 1056 if (MCSym.getInt()) 1057 // External to current translation unit. 1058 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/); 1059 else 1060 // Internal to current translation unit. 1061 // 1062 // When we place the LSDA into the TEXT section, the type info pointers 1063 // need to be indirect and pc-rel. We accomplish this by using NLPs. 1064 // However, sometimes the types are local to the file. So we need to 1065 // fill in the value for the NLP in those cases. 1066 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(), 1067 OutContext), 1068 isPPC64 ? 8 : 4/*size*/); 1069 } 1070 1071 Stubs.clear(); 1072 OutStreamer.AddBlankLine(); 1073 } 1074 1075 Stubs = MMIMacho.GetHiddenGVStubList(); 1076 if (!Stubs.empty()) { 1077 OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); 1078 EmitAlignment(isPPC64 ? 3 : 2); 1079 1080 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 1081 // L_foo$stub: 1082 OutStreamer.EmitLabel(Stubs[i].first); 1083 // .long _foo 1084 OutStreamer.EmitValue(MCSymbolRefExpr:: 1085 Create(Stubs[i].second.getPointer(), 1086 OutContext), 1087 isPPC64 ? 8 : 4/*size*/); 1088 } 1089 1090 Stubs.clear(); 1091 OutStreamer.AddBlankLine(); 1092 } 1093 1094 // Funny Darwin hack: This flag tells the linker that no global symbols 1095 // contain code that falls through to other global symbols (e.g. the obvious 1096 // implementation of multiple entry points). If this doesn't occur, the 1097 // linker can safely perform dead code stripping. Since LLVM never generates 1098 // code that does this, it is always safe to set. 1099 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols); 1100 1101 return AsmPrinter::doFinalization(M); 1102} 1103 1104/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code 1105/// for a MachineFunction to the given output stream, in a format that the 1106/// Darwin assembler can deal with. 1107/// 1108static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm, 1109 MCStreamer &Streamer) { 1110 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>(); 1111 1112 if (Subtarget->isDarwin()) 1113 return new PPCDarwinAsmPrinter(tm, Streamer); 1114 return new PPCLinuxAsmPrinter(tm, Streamer); 1115} 1116 1117// Force static initialization. 1118extern "C" void LLVMInitializePowerPCAsmPrinter() { 1119 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass); 1120 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass); 1121} 1122