1 //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T 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 X86 machine code. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "X86AsmPrinter.h" 16 #include "InstPrinter/X86ATTInstPrinter.h" 17 #include "X86.h" 18 #include "X86COFFMachineModuleInfo.h" 19 #include "X86MachineFunctionInfo.h" 20 #include "X86TargetMachine.h" 21 #include "llvm/ADT/SmallString.h" 22 #include "llvm/Assembly/Writer.h" 23 #include "llvm/CodeGen/MachineJumpTableInfo.h" 24 #include "llvm/CodeGen/MachineModuleInfoImpls.h" 25 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" 26 #include "llvm/DebugInfo.h" 27 #include "llvm/IR/CallingConv.h" 28 #include "llvm/IR/DerivedTypes.h" 29 #include "llvm/IR/Module.h" 30 #include "llvm/IR/Type.h" 31 #include "llvm/MC/MCAsmInfo.h" 32 #include "llvm/MC/MCContext.h" 33 #include "llvm/MC/MCExpr.h" 34 #include "llvm/MC/MCSectionMachO.h" 35 #include "llvm/MC/MCStreamer.h" 36 #include "llvm/MC/MCSymbol.h" 37 #include "llvm/Support/COFF.h" 38 #include "llvm/Support/Debug.h" 39 #include "llvm/Support/ErrorHandling.h" 40 #include "llvm/Support/TargetRegistry.h" 41 #include "llvm/Target/Mangler.h" 42 #include "llvm/Target/TargetOptions.h" 43 using namespace llvm; 44 45 //===----------------------------------------------------------------------===// 46 // Primitive Helper Functions. 47 //===----------------------------------------------------------------------===// 48 49 /// runOnMachineFunction - Emit the function body. 50 /// 51 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) { 52 SetupMachineFunction(MF); 53 54 if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho()) { 55 bool Intrn = MF.getFunction()->hasInternalLinkage(); 56 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym); 57 OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC 58 : COFF::IMAGE_SYM_CLASS_EXTERNAL); 59 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION 60 << COFF::SCT_COMPLEX_TYPE_SHIFT); 61 OutStreamer.EndCOFFSymbolDef(); 62 } 63 64 // Have common code print out the function header with linkage info etc. 65 EmitFunctionHeader(); 66 67 // Emit the rest of the function body. 68 EmitFunctionBody(); 69 70 // We didn't modify anything. 71 return false; 72 } 73 74 /// printSymbolOperand - Print a raw symbol reference operand. This handles 75 /// jump tables, constant pools, global address and external symbols, all of 76 /// which print to a label with various suffixes for relocation types etc. 77 void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO, 78 raw_ostream &O) { 79 switch (MO.getType()) { 80 default: llvm_unreachable("unknown symbol type!"); 81 case MachineOperand::MO_JumpTableIndex: 82 O << *GetJTISymbol(MO.getIndex()); 83 break; 84 case MachineOperand::MO_ConstantPoolIndex: 85 O << *GetCPISymbol(MO.getIndex()); 86 printOffset(MO.getOffset(), O); 87 break; 88 case MachineOperand::MO_GlobalAddress: { 89 const GlobalValue *GV = MO.getGlobal(); 90 91 MCSymbol *GVSym; 92 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) 93 GVSym = GetSymbolWithGlobalValueBase(GV, "$stub"); 94 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || 95 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE || 96 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE) 97 GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); 98 else 99 GVSym = Mang->getSymbol(GV); 100 101 // Handle dllimport linkage. 102 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT) 103 GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName()); 104 105 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || 106 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) { 107 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); 108 MachineModuleInfoImpl::StubValueTy &StubSym = 109 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym); 110 if (StubSym.getPointer() == 0) 111 StubSym = MachineModuleInfoImpl:: 112 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); 113 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){ 114 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); 115 MachineModuleInfoImpl::StubValueTy &StubSym = 116 MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym); 117 if (StubSym.getPointer() == 0) 118 StubSym = MachineModuleInfoImpl:: 119 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); 120 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) { 121 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub"); 122 MachineModuleInfoImpl::StubValueTy &StubSym = 123 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym); 124 if (StubSym.getPointer() == 0) 125 StubSym = MachineModuleInfoImpl:: 126 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage()); 127 } 128 129 // If the name begins with a dollar-sign, enclose it in parens. We do this 130 // to avoid having it look like an integer immediate to the assembler. 131 if (GVSym->getName()[0] != '$') 132 O << *GVSym; 133 else 134 O << '(' << *GVSym << ')'; 135 printOffset(MO.getOffset(), O); 136 break; 137 } 138 case MachineOperand::MO_ExternalSymbol: { 139 const MCSymbol *SymToPrint; 140 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) { 141 SmallString<128> TempNameStr; 142 TempNameStr += StringRef(MO.getSymbolName()); 143 TempNameStr += StringRef("$stub"); 144 145 MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str()); 146 MachineModuleInfoImpl::StubValueTy &StubSym = 147 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym); 148 if (StubSym.getPointer() == 0) { 149 TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end()); 150 StubSym = MachineModuleInfoImpl:: 151 StubValueTy(OutContext.GetOrCreateSymbol(TempNameStr.str()), 152 true); 153 } 154 SymToPrint = StubSym.getPointer(); 155 } else { 156 SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName()); 157 } 158 159 // If the name begins with a dollar-sign, enclose it in parens. We do this 160 // to avoid having it look like an integer immediate to the assembler. 161 if (SymToPrint->getName()[0] != '$') 162 O << *SymToPrint; 163 else 164 O << '(' << *SymToPrint << '('; 165 break; 166 } 167 } 168 169 switch (MO.getTargetFlags()) { 170 default: 171 llvm_unreachable("Unknown target flag on GV operand"); 172 case X86II::MO_NO_FLAG: // No flag. 173 break; 174 case X86II::MO_DARWIN_NONLAZY: 175 case X86II::MO_DLLIMPORT: 176 case X86II::MO_DARWIN_STUB: 177 // These affect the name of the symbol, not any suffix. 178 break; 179 case X86II::MO_GOT_ABSOLUTE_ADDRESS: 180 O << " + [.-" << *MF->getPICBaseSymbol() << ']'; 181 break; 182 case X86II::MO_PIC_BASE_OFFSET: 183 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: 184 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: 185 O << '-' << *MF->getPICBaseSymbol(); 186 break; 187 case X86II::MO_TLSGD: O << "@TLSGD"; break; 188 case X86II::MO_TLSLD: O << "@TLSLD"; break; 189 case X86II::MO_TLSLDM: O << "@TLSLDM"; break; 190 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break; 191 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break; 192 case X86II::MO_TPOFF: O << "@TPOFF"; break; 193 case X86II::MO_DTPOFF: O << "@DTPOFF"; break; 194 case X86II::MO_NTPOFF: O << "@NTPOFF"; break; 195 case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break; 196 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break; 197 case X86II::MO_GOT: O << "@GOT"; break; 198 case X86II::MO_GOTOFF: O << "@GOTOFF"; break; 199 case X86II::MO_PLT: O << "@PLT"; break; 200 case X86II::MO_TLVP: O << "@TLVP"; break; 201 case X86II::MO_TLVP_PIC_BASE: 202 O << "@TLVP" << '-' << *MF->getPICBaseSymbol(); 203 break; 204 case X86II::MO_SECREL: O << "@SECREL32"; break; 205 } 206 } 207 208 /// printPCRelImm - This is used to print an immediate value that ends up 209 /// being encoded as a pc-relative value. These print slightly differently, for 210 /// example, a $ is not emitted. 211 void X86AsmPrinter::printPCRelImm(const MachineInstr *MI, unsigned OpNo, 212 raw_ostream &O) { 213 const MachineOperand &MO = MI->getOperand(OpNo); 214 switch (MO.getType()) { 215 default: llvm_unreachable("Unknown pcrel immediate operand"); 216 case MachineOperand::MO_Register: 217 // pc-relativeness was handled when computing the value in the reg. 218 printOperand(MI, OpNo, O); 219 return; 220 case MachineOperand::MO_Immediate: 221 O << MO.getImm(); 222 return; 223 case MachineOperand::MO_MachineBasicBlock: 224 O << *MO.getMBB()->getSymbol(); 225 return; 226 case MachineOperand::MO_GlobalAddress: 227 case MachineOperand::MO_ExternalSymbol: 228 printSymbolOperand(MO, O); 229 return; 230 } 231 } 232 233 234 void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, 235 raw_ostream &O, const char *Modifier, 236 unsigned AsmVariant) { 237 const MachineOperand &MO = MI->getOperand(OpNo); 238 switch (MO.getType()) { 239 default: llvm_unreachable("unknown operand type!"); 240 case MachineOperand::MO_Register: { 241 // FIXME: Enumerating AsmVariant, so we can remove magic number. 242 if (AsmVariant == 0) O << '%'; 243 unsigned Reg = MO.getReg(); 244 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) { 245 MVT::SimpleValueType VT = (strcmp(Modifier+6,"64") == 0) ? 246 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 : 247 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8)); 248 Reg = getX86SubSuperRegister(Reg, VT); 249 } 250 O << X86ATTInstPrinter::getRegisterName(Reg); 251 return; 252 } 253 254 case MachineOperand::MO_Immediate: 255 if (AsmVariant == 0) O << '$'; 256 O << MO.getImm(); 257 return; 258 259 case MachineOperand::MO_JumpTableIndex: 260 case MachineOperand::MO_ConstantPoolIndex: 261 case MachineOperand::MO_GlobalAddress: 262 case MachineOperand::MO_ExternalSymbol: { 263 if (AsmVariant == 0) O << '$'; 264 printSymbolOperand(MO, O); 265 break; 266 } 267 } 268 } 269 270 void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op, 271 raw_ostream &O, const char *Modifier) { 272 const MachineOperand &BaseReg = MI->getOperand(Op); 273 const MachineOperand &IndexReg = MI->getOperand(Op+2); 274 const MachineOperand &DispSpec = MI->getOperand(Op+3); 275 276 // If we really don't want to print out (rip), don't. 277 bool HasBaseReg = BaseReg.getReg() != 0; 278 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") && 279 BaseReg.getReg() == X86::RIP) 280 HasBaseReg = false; 281 282 // HasParenPart - True if we will print out the () part of the mem ref. 283 bool HasParenPart = IndexReg.getReg() || HasBaseReg; 284 285 if (DispSpec.isImm()) { 286 int DispVal = DispSpec.getImm(); 287 if (DispVal || !HasParenPart) 288 O << DispVal; 289 } else { 290 assert(DispSpec.isGlobal() || DispSpec.isCPI() || 291 DispSpec.isJTI() || DispSpec.isSymbol()); 292 printSymbolOperand(MI->getOperand(Op+3), O); 293 } 294 295 if (Modifier && strcmp(Modifier, "H") == 0) 296 O << "+8"; 297 298 if (HasParenPart) { 299 assert(IndexReg.getReg() != X86::ESP && 300 "X86 doesn't allow scaling by ESP"); 301 302 O << '('; 303 if (HasBaseReg) 304 printOperand(MI, Op, O, Modifier); 305 306 if (IndexReg.getReg()) { 307 O << ','; 308 printOperand(MI, Op+2, O, Modifier); 309 unsigned ScaleVal = MI->getOperand(Op+1).getImm(); 310 if (ScaleVal != 1) 311 O << ',' << ScaleVal; 312 } 313 O << ')'; 314 } 315 } 316 317 void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op, 318 raw_ostream &O, const char *Modifier) { 319 assert(isMem(MI, Op) && "Invalid memory reference!"); 320 const MachineOperand &Segment = MI->getOperand(Op+4); 321 if (Segment.getReg()) { 322 printOperand(MI, Op+4, O, Modifier); 323 O << ':'; 324 } 325 printLeaMemReference(MI, Op, O, Modifier); 326 } 327 328 void X86AsmPrinter::printIntelMemReference(const MachineInstr *MI, unsigned Op, 329 raw_ostream &O, const char *Modifier, 330 unsigned AsmVariant){ 331 const MachineOperand &BaseReg = MI->getOperand(Op); 332 unsigned ScaleVal = MI->getOperand(Op+1).getImm(); 333 const MachineOperand &IndexReg = MI->getOperand(Op+2); 334 const MachineOperand &DispSpec = MI->getOperand(Op+3); 335 const MachineOperand &SegReg = MI->getOperand(Op+4); 336 337 // If this has a segment register, print it. 338 if (SegReg.getReg()) { 339 printOperand(MI, Op+4, O, Modifier, AsmVariant); 340 O << ':'; 341 } 342 343 O << '['; 344 345 bool NeedPlus = false; 346 if (BaseReg.getReg()) { 347 printOperand(MI, Op, O, Modifier, AsmVariant); 348 NeedPlus = true; 349 } 350 351 if (IndexReg.getReg()) { 352 if (NeedPlus) O << " + "; 353 if (ScaleVal != 1) 354 O << ScaleVal << '*'; 355 printOperand(MI, Op+2, O, Modifier, AsmVariant); 356 NeedPlus = true; 357 } 358 359 if (!DispSpec.isImm()) { 360 if (NeedPlus) O << " + "; 361 printOperand(MI, Op+3, O, Modifier, AsmVariant); 362 } else { 363 int64_t DispVal = DispSpec.getImm(); 364 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) { 365 if (NeedPlus) { 366 if (DispVal > 0) 367 O << " + "; 368 else { 369 O << " - "; 370 DispVal = -DispVal; 371 } 372 } 373 O << DispVal; 374 } 375 } 376 O << ']'; 377 } 378 379 bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode, 380 raw_ostream &O) { 381 unsigned Reg = MO.getReg(); 382 switch (Mode) { 383 default: return true; // Unknown mode. 384 case 'b': // Print QImode register 385 Reg = getX86SubSuperRegister(Reg, MVT::i8); 386 break; 387 case 'h': // Print QImode high register 388 Reg = getX86SubSuperRegister(Reg, MVT::i8, true); 389 break; 390 case 'w': // Print HImode register 391 Reg = getX86SubSuperRegister(Reg, MVT::i16); 392 break; 393 case 'k': // Print SImode register 394 Reg = getX86SubSuperRegister(Reg, MVT::i32); 395 break; 396 case 'q': // Print DImode register 397 Reg = getX86SubSuperRegister(Reg, MVT::i64); 398 break; 399 } 400 401 O << '%' << X86ATTInstPrinter::getRegisterName(Reg); 402 return false; 403 } 404 405 /// PrintAsmOperand - Print out an operand for an inline asm expression. 406 /// 407 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 408 unsigned AsmVariant, 409 const char *ExtraCode, raw_ostream &O) { 410 // Does this asm operand have a single letter operand modifier? 411 if (ExtraCode && ExtraCode[0]) { 412 if (ExtraCode[1] != 0) return true; // Unknown modifier. 413 414 const MachineOperand &MO = MI->getOperand(OpNo); 415 416 switch (ExtraCode[0]) { 417 default: 418 // See if this is a generic print operand 419 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O); 420 case 'a': // This is an address. Currently only 'i' and 'r' are expected. 421 if (MO.isImm()) { 422 O << MO.getImm(); 423 return false; 424 } 425 if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) { 426 printSymbolOperand(MO, O); 427 if (Subtarget->isPICStyleRIPRel()) 428 O << "(%rip)"; 429 return false; 430 } 431 if (MO.isReg()) { 432 O << '('; 433 printOperand(MI, OpNo, O); 434 O << ')'; 435 return false; 436 } 437 return true; 438 439 case 'c': // Don't print "$" before a global var name or constant. 440 if (MO.isImm()) 441 O << MO.getImm(); 442 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) 443 printSymbolOperand(MO, O); 444 else 445 printOperand(MI, OpNo, O); 446 return false; 447 448 case 'A': // Print '*' before a register (it must be a register) 449 if (MO.isReg()) { 450 O << '*'; 451 printOperand(MI, OpNo, O); 452 return false; 453 } 454 return true; 455 456 case 'b': // Print QImode register 457 case 'h': // Print QImode high register 458 case 'w': // Print HImode register 459 case 'k': // Print SImode register 460 case 'q': // Print DImode register 461 if (MO.isReg()) 462 return printAsmMRegister(MO, ExtraCode[0], O); 463 printOperand(MI, OpNo, O); 464 return false; 465 466 case 'P': // This is the operand of a call, treat specially. 467 printPCRelImm(MI, OpNo, O); 468 return false; 469 470 case 'n': // Negate the immediate or print a '-' before the operand. 471 // Note: this is a temporary solution. It should be handled target 472 // independently as part of the 'MC' work. 473 if (MO.isImm()) { 474 O << -MO.getImm(); 475 return false; 476 } 477 O << '-'; 478 } 479 } 480 481 printOperand(MI, OpNo, O, /*Modifier*/ 0, AsmVariant); 482 return false; 483 } 484 485 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, 486 unsigned OpNo, unsigned AsmVariant, 487 const char *ExtraCode, 488 raw_ostream &O) { 489 if (AsmVariant) { 490 printIntelMemReference(MI, OpNo, O); 491 return false; 492 } 493 494 if (ExtraCode && ExtraCode[0]) { 495 if (ExtraCode[1] != 0) return true; // Unknown modifier. 496 497 switch (ExtraCode[0]) { 498 default: return true; // Unknown modifier. 499 case 'b': // Print QImode register 500 case 'h': // Print QImode high register 501 case 'w': // Print HImode register 502 case 'k': // Print SImode register 503 case 'q': // Print SImode register 504 // These only apply to registers, ignore on mem. 505 break; 506 case 'H': 507 printMemReference(MI, OpNo, O, "H"); 508 return false; 509 case 'P': // Don't print @PLT, but do print as memory. 510 printMemReference(MI, OpNo, O, "no-rip"); 511 return false; 512 } 513 } 514 printMemReference(MI, OpNo, O); 515 return false; 516 } 517 518 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) { 519 if (Subtarget->isTargetEnvMacho()) 520 OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); 521 } 522 523 524 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) { 525 if (Subtarget->isTargetEnvMacho()) { 526 // All darwin targets use mach-o. 527 MachineModuleInfoMachO &MMIMacho = 528 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 529 530 // Output stubs for dynamically-linked functions. 531 MachineModuleInfoMachO::SymbolListTy Stubs; 532 533 Stubs = MMIMacho.GetFnStubList(); 534 if (!Stubs.empty()) { 535 const MCSection *TheSection = 536 OutContext.getMachOSection("__IMPORT", "__jump_table", 537 MCSectionMachO::S_SYMBOL_STUBS | 538 MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE | 539 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 540 5, SectionKind::getMetadata()); 541 OutStreamer.SwitchSection(TheSection); 542 543 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 544 // L_foo$stub: 545 OutStreamer.EmitLabel(Stubs[i].first); 546 // .indirect_symbol _foo 547 OutStreamer.EmitSymbolAttribute(Stubs[i].second.getPointer(), 548 MCSA_IndirectSymbol); 549 // hlt; hlt; hlt; hlt; hlt hlt = 0xf4. 550 const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4"; 551 OutStreamer.EmitBytes(StringRef(HltInsts, 5)); 552 } 553 554 Stubs.clear(); 555 OutStreamer.AddBlankLine(); 556 } 557 558 // Output stubs for external and common global variables. 559 Stubs = MMIMacho.GetGVStubList(); 560 if (!Stubs.empty()) { 561 const MCSection *TheSection = 562 OutContext.getMachOSection("__IMPORT", "__pointers", 563 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 564 SectionKind::getMetadata()); 565 OutStreamer.SwitchSection(TheSection); 566 567 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 568 // L_foo$non_lazy_ptr: 569 OutStreamer.EmitLabel(Stubs[i].first); 570 // .indirect_symbol _foo 571 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second; 572 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), 573 MCSA_IndirectSymbol); 574 // .long 0 575 if (MCSym.getInt()) 576 // External to current translation unit. 577 OutStreamer.EmitIntValue(0, 4/*size*/); 578 else 579 // Internal to current translation unit. 580 // 581 // When we place the LSDA into the TEXT section, the type info 582 // pointers need to be indirect and pc-rel. We accomplish this by 583 // using NLPs. However, sometimes the types are local to the file. So 584 // we need to fill in the value for the NLP in those cases. 585 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(), 586 OutContext), 4/*size*/); 587 } 588 Stubs.clear(); 589 OutStreamer.AddBlankLine(); 590 } 591 592 Stubs = MMIMacho.GetHiddenGVStubList(); 593 if (!Stubs.empty()) { 594 OutStreamer.SwitchSection(getObjFileLowering().getDataSection()); 595 EmitAlignment(2); 596 597 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 598 // L_foo$non_lazy_ptr: 599 OutStreamer.EmitLabel(Stubs[i].first); 600 // .long _foo 601 OutStreamer.EmitValue(MCSymbolRefExpr:: 602 Create(Stubs[i].second.getPointer(), 603 OutContext), 4/*size*/); 604 } 605 Stubs.clear(); 606 OutStreamer.AddBlankLine(); 607 } 608 609 // Funny Darwin hack: This flag tells the linker that no global symbols 610 // contain code that falls through to other global symbols (e.g. the obvious 611 // implementation of multiple entry points). If this doesn't occur, the 612 // linker can safely perform dead code stripping. Since LLVM never 613 // generates code that does this, it is always safe to set. 614 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols); 615 } 616 617 if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygMing() && 618 MMI->usesVAFloatArgument()) { 619 StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused"; 620 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName); 621 OutStreamer.EmitSymbolAttribute(S, MCSA_Global); 622 } 623 624 if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho()) { 625 X86COFFMachineModuleInfo &COFFMMI = 626 MMI->getObjFileInfo<X86COFFMachineModuleInfo>(); 627 628 // Emit type information for external functions 629 typedef X86COFFMachineModuleInfo::externals_iterator externals_iterator; 630 for (externals_iterator I = COFFMMI.externals_begin(), 631 E = COFFMMI.externals_end(); 632 I != E; ++I) { 633 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym); 634 OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL); 635 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION 636 << COFF::SCT_COMPLEX_TYPE_SHIFT); 637 OutStreamer.EndCOFFSymbolDef(); 638 } 639 640 // Necessary for dllexport support 641 std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals; 642 643 const TargetLoweringObjectFileCOFF &TLOFCOFF = 644 static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering()); 645 646 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) 647 if (I->hasDLLExportLinkage()) 648 DLLExportedFns.push_back(Mang->getSymbol(I)); 649 650 for (Module::const_global_iterator I = M.global_begin(), 651 E = M.global_end(); I != E; ++I) 652 if (I->hasDLLExportLinkage()) 653 DLLExportedGlobals.push_back(Mang->getSymbol(I)); 654 655 // Output linker support code for dllexported globals on windows. 656 if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) { 657 OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection()); 658 SmallString<128> name; 659 for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i) { 660 if (Subtarget->isTargetWindows()) 661 name = " /EXPORT:"; 662 else 663 name = " -export:"; 664 name += DLLExportedGlobals[i]->getName(); 665 if (Subtarget->isTargetWindows()) 666 name += ",DATA"; 667 else 668 name += ",data"; 669 OutStreamer.EmitBytes(name); 670 } 671 672 for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i) { 673 if (Subtarget->isTargetWindows()) 674 name = " /EXPORT:"; 675 else 676 name = " -export:"; 677 name += DLLExportedFns[i]->getName(); 678 OutStreamer.EmitBytes(name); 679 } 680 } 681 } 682 683 if (Subtarget->isTargetELF()) { 684 const TargetLoweringObjectFileELF &TLOFELF = 685 static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering()); 686 687 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>(); 688 689 // Output stubs for external and common global variables. 690 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList(); 691 if (!Stubs.empty()) { 692 OutStreamer.SwitchSection(TLOFELF.getDataRelSection()); 693 const DataLayout *TD = TM.getDataLayout(); 694 695 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) { 696 OutStreamer.EmitLabel(Stubs[i].first); 697 OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(), 698 TD->getPointerSize()); 699 } 700 Stubs.clear(); 701 } 702 } 703 } 704 705 //===----------------------------------------------------------------------===// 706 // Target Registry Stuff 707 //===----------------------------------------------------------------------===// 708 709 // Force static initialization. 710 extern "C" void LLVMInitializeX86AsmPrinter() { 711 RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target); 712 RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target); 713 } 714
