lib/Target/X86/X86AsmPrinter.cpp

   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 "InstPrinter/X86IntelInstPrinter.h"
  18 #include "X86MCInstLower.h"
  19 #include "X86.h"
  20 #include "X86COFFMachineModuleInfo.h"
  21 #include "X86MachineFunctionInfo.h"
  22 #include "X86TargetMachine.h"
  23 #include "llvm/CallingConv.h"
  24 #include "llvm/DerivedTypes.h"
  25 #include "llvm/Module.h"
  26 #include "llvm/Type.h"
  27 #include "llvm/Analysis/DebugInfo.h"
  28 #include "llvm/Assembly/Writer.h"
  29 #include "llvm/MC/MCAsmInfo.h"
  30 #include "llvm/MC/MCContext.h"
  31 #include "llvm/MC/MCExpr.h"
  32 #include "llvm/MC/MCSectionMachO.h"
  33 #include "llvm/MC/MCStreamer.h"
  34 #include "llvm/MC/MCSymbol.h"
  35 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  36 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
  37 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
  38 #include "llvm/Support/COFF.h"
  39 #include "llvm/Support/Debug.h"
  40 #include "llvm/Support/ErrorHandling.h"
  41 #include "llvm/Target/Mangler.h"
  42 #include "llvm/Target/TargetOptions.h"
  43 #include "llvm/Target/TargetRegistry.h"
  44 #include "llvm/ADT/SmallString.h"
  45 using namespace llvm;
  46
  47 //===----------------------------------------------------------------------===//
  48 // Primitive Helper Functions.
  49 //===----------------------------------------------------------------------===//
  50
  51 void X86AsmPrinter::PrintPICBaseSymbol(raw_ostream &O) const {
  52   const TargetLowering *TLI = TM.getTargetLowering();
  53   O << *static_cast<const X86TargetLowering*>(TLI)->getPICBaseSymbol(MF,
  54                                                                     OutContext);
  55 }
  56
  57 /// runOnMachineFunction - Emit the function body.
  58 ///
  59 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
  60   SetupMachineFunction(MF);
  61
  62   if (Subtarget->isTargetCOFF()) {
  63     bool Intrn = MF.getFunction()->hasInternalLinkage();
  64     OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
  65     OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC
  66                                               : COFF::IMAGE_SYM_CLASS_EXTERNAL);
  67     OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
  68                                                << COFF::SCT_COMPLEX_TYPE_SHIFT);
  69     OutStreamer.EndCOFFSymbolDef();
  70   }
  71
  72   // Have common code print out the function header with linkage info etc.
  73   EmitFunctionHeader();
  74
  75   // Emit the rest of the function body.
  76   EmitFunctionBody();
  77
  78   // We didn't modify anything.
  79   return false;
  80 }
  81
  82 /// printSymbolOperand - Print a raw symbol reference operand.  This handles
  83 /// jump tables, constant pools, global address and external symbols, all of
  84 /// which print to a label with various suffixes for relocation types etc.
  85 void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO,
  86                                        raw_ostream &O) {
  87   switch (MO.getType()) {
  88   default: llvm_unreachable("unknown symbol type!");
  89   case MachineOperand::MO_JumpTableIndex:
  90     O << *GetJTISymbol(MO.getIndex());
  91     break;
  92   case MachineOperand::MO_ConstantPoolIndex:
  93     O << *GetCPISymbol(MO.getIndex());
  94     printOffset(MO.getOffset(), O);
  95     break;
  96   case MachineOperand::MO_GlobalAddress: {
  97     const GlobalValue *GV = MO.getGlobal();
  98
  99     MCSymbol *GVSym;
 100     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 101       GVSym = GetSymbolWithGlobalValueBase(GV, "$stub");
 102     else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 103              MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
 104              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 105       GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 106     else
 107       GVSym = Mang->getSymbol(GV);
 108
 109     // Handle dllimport linkage.
 110     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
 111       GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
 112
 113     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 114         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
 115       MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 116       MachineModuleInfoImpl::StubValueTy &StubSym =
 117         MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
 118       if (StubSym.getPointer() == 0)
 119         StubSym = MachineModuleInfoImpl::
 120           StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
 121     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
 122       MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 123       MachineModuleInfoImpl::StubValueTy &StubSym =
 124         MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
 125       if (StubSym.getPointer() == 0)
 126         StubSym = MachineModuleInfoImpl::
 127           StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
 128     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 129       MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
 130       MachineModuleInfoImpl::StubValueTy &StubSym =
 131         MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
 132       if (StubSym.getPointer() == 0)
 133         StubSym = MachineModuleInfoImpl::
 134           StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
 135     }
 136
 137     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 138     // to avoid having it look like an integer immediate to the assembler.
 139     if (GVSym->getName()[0] != '$')
 140       O << *GVSym;
 141     else
 142       O << '(' << *GVSym << ')';
 143     printOffset(MO.getOffset(), O);
 144     break;
 145   }
 146   case MachineOperand::MO_ExternalSymbol: {
 147     const MCSymbol *SymToPrint;
 148     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 149       SmallString<128> TempNameStr;
 150       TempNameStr += StringRef(MO.getSymbolName());
 151       TempNameStr += StringRef("$stub");
 152
 153       MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
 154       MachineModuleInfoImpl::StubValueTy &StubSym =
 155         MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
 156       if (StubSym.getPointer() == 0) {
 157         TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
 158         StubSym = MachineModuleInfoImpl::
 159           StubValueTy(OutContext.GetOrCreateSymbol(TempNameStr.str()),
 160                       true);
 161       }
 162       SymToPrint = StubSym.getPointer();
 163     } else {
 164       SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName());
 165     }
 166
 167     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 168     // to avoid having it look like an integer immediate to the assembler.
 169     if (SymToPrint->getName()[0] != '$')
 170       O << *SymToPrint;
 171     else
 172       O << '(' << *SymToPrint << '(';
 173     break;
 174   }
 175   }
 176
 177   switch (MO.getTargetFlags()) {
 178   default:
 179     llvm_unreachable("Unknown target flag on GV operand");
 180   case X86II::MO_NO_FLAG:    // No flag.
 181     break;
 182   case X86II::MO_DARWIN_NONLAZY:
 183   case X86II::MO_DLLIMPORT:
 184   case X86II::MO_DARWIN_STUB:
 185     // These affect the name of the symbol, not any suffix.
 186     break;
 187   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
 188     O << " + [.-";
 189     PrintPICBaseSymbol(O);
 190     O << ']';
 191     break;
 192   case X86II::MO_PIC_BASE_OFFSET:
 193   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
 194   case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
 195     O << '-';
 196     PrintPICBaseSymbol(O);
 197     break;
 198   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
 199   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
 200   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
 201   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
 202   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
 203   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
 204   case X86II::MO_GOT:       O << "@GOT";       break;
 205   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
 206   case X86II::MO_PLT:       O << "@PLT";       break;
 207   case X86II::MO_TLVP:      O << "@TLVP";      break;
 208   case X86II::MO_TLVP_PIC_BASE:
 209     O << "@TLVP" << '-';
 210     PrintPICBaseSymbol(O);
 211     break;
 212   }
 213 }
 214
 215 /// print_pcrel_imm - This is used to print an immediate value that ends up
 216 /// being encoded as a pc-relative value.  These print slightly differently, for
 217 /// example, a $ is not emitted.
 218 void X86AsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo,
 219                                     raw_ostream &O) {
 220   const MachineOperand &MO = MI->getOperand(OpNo);
 221   switch (MO.getType()) {
 222   default: llvm_unreachable("Unknown pcrel immediate operand");
 223   case MachineOperand::MO_Register:
 224     // pc-relativeness was handled when computing the value in the reg.
 225     printOperand(MI, OpNo, O);
 226     return;
 227   case MachineOperand::MO_Immediate:
 228     O << MO.getImm();
 229     return;
 230   case MachineOperand::MO_MachineBasicBlock:
 231     O << *MO.getMBB()->getSymbol();
 232     return;
 233   case MachineOperand::MO_GlobalAddress:
 234   case MachineOperand::MO_ExternalSymbol:
 235     printSymbolOperand(MO, O);
 236     return;
 237   }
 238 }
 239
 240
 241 void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 242                                  raw_ostream &O, const char *Modifier) {
 243   const MachineOperand &MO = MI->getOperand(OpNo);
 244   switch (MO.getType()) {
 245   default: llvm_unreachable("unknown operand type!");
 246   case MachineOperand::MO_Register: {
 247     O << '%';
 248     unsigned Reg = MO.getReg();
 249     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 250       EVT VT = (strcmp(Modifier+6,"64") == 0) ?
 251         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 252                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 253       Reg = getX86SubSuperRegister(Reg, VT);
 254     }
 255     O << X86ATTInstPrinter::getRegisterName(Reg);
 256     return;
 257   }
 258
 259   case MachineOperand::MO_Immediate:
 260     O << '$' << MO.getImm();
 261     return;
 262
 263   case MachineOperand::MO_JumpTableIndex:
 264   case MachineOperand::MO_ConstantPoolIndex:
 265   case MachineOperand::MO_GlobalAddress:
 266   case MachineOperand::MO_ExternalSymbol: {
 267     O << '$';
 268     printSymbolOperand(MO, O);
 269     break;
 270   }
 271   }
 272 }
 273
 274 void X86AsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op,
 275                                raw_ostream &O) {
 276   unsigned char value = MI->getOperand(Op).getImm();
 277   assert(value <= 7 && "Invalid ssecc argument!");
 278   switch (value) {
 279   case 0: O << "eq"; break;
 280   case 1: O << "lt"; break;
 281   case 2: O << "le"; break;
 282   case 3: O << "unord"; break;
 283   case 4: O << "neq"; break;
 284   case 5: O << "nlt"; break;
 285   case 6: O << "nle"; break;
 286   case 7: O << "ord"; break;
 287   }
 288 }
 289
 290 void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
 291                                          raw_ostream &O, const char *Modifier) {
 292   const MachineOperand &BaseReg  = MI->getOperand(Op);
 293   const MachineOperand &IndexReg = MI->getOperand(Op+2);
 294   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 295
 296   // If we really don't want to print out (rip), don't.
 297   bool HasBaseReg = BaseReg.getReg() != 0;
 298   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
 299       BaseReg.getReg() == X86::RIP)
 300     HasBaseReg = false;
 301
 302   // HasParenPart - True if we will print out the () part of the mem ref.
 303   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
 304
 305   if (DispSpec.isImm()) {
 306     int DispVal = DispSpec.getImm();
 307     if (DispVal || !HasParenPart)
 308       O << DispVal;
 309   } else {
 310     assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 311            DispSpec.isJTI() || DispSpec.isSymbol());
 312     printSymbolOperand(MI->getOperand(Op+3), O);
 313   }
 314
 315   if (HasParenPart) {
 316     assert(IndexReg.getReg() != X86::ESP &&
 317            "X86 doesn't allow scaling by ESP");
 318
 319     O << '(';
 320     if (HasBaseReg)
 321       printOperand(MI, Op, O, Modifier);
 322
 323     if (IndexReg.getReg()) {
 324       O << ',';
 325       printOperand(MI, Op+2, O, Modifier);
 326       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 327       if (ScaleVal != 1)
 328         O << ',' << ScaleVal;
 329     }
 330     O << ')';
 331   }
 332 }
 333
 334 void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 335                                       raw_ostream &O, const char *Modifier) {
 336   assert(isMem(MI, Op) && "Invalid memory reference!");
 337   const MachineOperand &Segment = MI->getOperand(Op+4);
 338   if (Segment.getReg()) {
 339     printOperand(MI, Op+4, O, Modifier);
 340     O << ':';
 341   }
 342   printLeaMemReference(MI, Op, O, Modifier);
 343 }
 344
 345 void X86AsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op,
 346                                   raw_ostream &O) {
 347   PrintPICBaseSymbol(O);
 348   O << '\n';
 349   PrintPICBaseSymbol(O);
 350   O << ':';
 351 }
 352
 353 bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode,
 354                                       raw_ostream &O) {
 355   unsigned Reg = MO.getReg();
 356   switch (Mode) {
 357   default: return true;  // Unknown mode.
 358   case 'b': // Print QImode register
 359     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 360     break;
 361   case 'h': // Print QImode high register
 362     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 363     break;
 364   case 'w': // Print HImode register
 365     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 366     break;
 367   case 'k': // Print SImode register
 368     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 369     break;
 370   case 'q': // Print DImode register
 371     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 372     break;
 373   }
 374
 375   O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
 376   return false;
 377 }
 378
 379 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 380 ///
 381 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 382                                     unsigned AsmVariant,
 383                                     const char *ExtraCode, raw_ostream &O) {
 384   // Does this asm operand have a single letter operand modifier?
 385   if (ExtraCode && ExtraCode[0]) {
 386     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 387
 388     const MachineOperand &MO = MI->getOperand(OpNo);
 389
 390     switch (ExtraCode[0]) {
 391     default: return true;  // Unknown modifier.
 392     case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
 393       if (MO.isImm()) {
 394         O << MO.getImm();
 395         return false;
 396       }
 397       if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
 398         printSymbolOperand(MO, O);
 399         if (Subtarget->isPICStyleRIPRel())
 400           O << "(%rip)";
 401         return false;
 402       }
 403       if (MO.isReg()) {
 404         O << '(';
 405         printOperand(MI, OpNo, O);
 406         O << ')';
 407         return false;
 408       }
 409       return true;
 410
 411     case 'c': // Don't print "$" before a global var name or constant.
 412       if (MO.isImm())
 413         O << MO.getImm();
 414       else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
 415         printSymbolOperand(MO, O);
 416       else
 417         printOperand(MI, OpNo, O);
 418       return false;
 419
 420     case 'A': // Print '*' before a register (it must be a register)
 421       if (MO.isReg()) {
 422         O << '*';
 423         printOperand(MI, OpNo, O);
 424         return false;
 425       }
 426       return true;
 427
 428     case 'b': // Print QImode register
 429     case 'h': // Print QImode high register
 430     case 'w': // Print HImode register
 431     case 'k': // Print SImode register
 432     case 'q': // Print DImode register
 433       if (MO.isReg())
 434         return printAsmMRegister(MO, ExtraCode[0], O);
 435       printOperand(MI, OpNo, O);
 436       return false;
 437
 438     case 'P': // This is the operand of a call, treat specially.
 439       print_pcrel_imm(MI, OpNo, O);
 440       return false;
 441
 442     case 'n':  // Negate the immediate or print a '-' before the operand.
 443       // Note: this is a temporary solution. It should be handled target
 444       // independently as part of the 'MC' work.
 445       if (MO.isImm()) {
 446         O << -MO.getImm();
 447         return false;
 448       }
 449       O << '-';
 450     }
 451   }
 452
 453   printOperand(MI, OpNo, O);
 454   return false;
 455 }
 456
 457 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 458                                           unsigned OpNo, unsigned AsmVariant,
 459                                           const char *ExtraCode,
 460                                           raw_ostream &O) {
 461   if (ExtraCode && ExtraCode[0]) {
 462     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 463
 464     switch (ExtraCode[0]) {
 465     default: return true;  // Unknown modifier.
 466     case 'b': // Print QImode register
 467     case 'h': // Print QImode high register
 468     case 'w': // Print HImode register
 469     case 'k': // Print SImode register
 470     case 'q': // Print SImode register
 471       // These only apply to registers, ignore on mem.
 472       break;
 473     case 'P': // Don't print @PLT, but do print as memory.
 474       printMemReference(MI, OpNo, O, "no-rip");
 475       return false;
 476     }
 477   }
 478   printMemReference(MI, OpNo, O);
 479   return false;
 480 }
 481
 482 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
 483   if (Subtarget->isTargetDarwin())
 484     OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
 485 }
 486
 487
 488 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
 489   if (Subtarget->isTargetDarwin()) {
 490     // All darwin targets use mach-o.
 491     MachineModuleInfoMachO &MMIMacho =
 492       MMI->getObjFileInfo<MachineModuleInfoMachO>();
 493
 494     // Output stubs for dynamically-linked functions.
 495     MachineModuleInfoMachO::SymbolListTy Stubs;
 496
 497     Stubs = MMIMacho.GetFnStubList();
 498     if (!Stubs.empty()) {
 499       const MCSection *TheSection =
 500         OutContext.getMachOSection("__IMPORT", "__jump_table",
 501                                    MCSectionMachO::S_SYMBOL_STUBS |
 502                                    MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
 503                                    MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 504                                    5, SectionKind::getMetadata());
 505       OutStreamer.SwitchSection(TheSection);
 506
 507       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 508         // L_foo$stub:
 509         OutStreamer.EmitLabel(Stubs[i].first);
 510         //   .indirect_symbol _foo
 511         OutStreamer.EmitSymbolAttribute(Stubs[i].second.getPointer(),
 512                                         MCSA_IndirectSymbol);
 513         // hlt; hlt; hlt; hlt; hlt     hlt = 0xf4 = -12.
 514         const char HltInsts[] = { -12, -12, -12, -12, -12 };
 515         OutStreamer.EmitBytes(StringRef(HltInsts, 5), 0/*addrspace*/);
 516       }
 517
 518       Stubs.clear();
 519       OutStreamer.AddBlankLine();
 520     }
 521
 522     // Output stubs for external and common global variables.
 523     Stubs = MMIMacho.GetGVStubList();
 524     if (!Stubs.empty()) {
 525       const MCSection *TheSection =
 526         OutContext.getMachOSection("__IMPORT", "__pointers",
 527                                    MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 528                                    SectionKind::getMetadata());
 529       OutStreamer.SwitchSection(TheSection);
 530
 531       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 532         // L_foo$non_lazy_ptr:
 533         OutStreamer.EmitLabel(Stubs[i].first);
 534         // .indirect_symbol _foo
 535         MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
 536         OutStreamer.EmitSymbolAttribute(MCSym.getPointer(),
 537                                         MCSA_IndirectSymbol);
 538         // .long 0
 539         if (MCSym.getInt())
 540           // External to current translation unit.
 541           OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
 542         else
 543           // Internal to current translation unit.
 544           //
 545           // When we place the LSDA into the TEXT section, the type info
 546           // pointers need to be indirect and pc-rel. We accomplish this by
 547           // using NLPs.  However, sometimes the types are local to the file. So
 548           // we need to fill in the value for the NLP in those cases.
 549           OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
 550                                                         OutContext),
 551                                 4/*size*/, 0/*addrspace*/);
 552       }
 553       Stubs.clear();
 554       OutStreamer.AddBlankLine();
 555     }
 556
 557     Stubs = MMIMacho.GetHiddenGVStubList();
 558     if (!Stubs.empty()) {
 559       OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
 560       EmitAlignment(2);
 561
 562       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 563         // L_foo$non_lazy_ptr:
 564         OutStreamer.EmitLabel(Stubs[i].first);
 565         // .long _foo
 566         OutStreamer.EmitValue(MCSymbolRefExpr::
 567                               Create(Stubs[i].second.getPointer(),
 568                                      OutContext),
 569                               4/*size*/, 0/*addrspace*/);
 570       }
 571       Stubs.clear();
 572       OutStreamer.AddBlankLine();
 573     }
 574
 575     // Funny Darwin hack: This flag tells the linker that no global symbols
 576     // contain code that falls through to other global symbols (e.g. the obvious
 577     // implementation of multiple entry points).  If this doesn't occur, the
 578     // linker can safely perform dead code stripping.  Since LLVM never
 579     // generates code that does this, it is always safe to set.
 580     OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 581   }
 582
 583   if (Subtarget->isTargetWindows()
 584    && !Subtarget->isTargetCygMing()
 585    && MMI->callsExternalVAFunctionWithFloatingPointArguments()) {
 586     StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
 587     MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
 588     OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
 589   }
 590
 591   if (Subtarget->isTargetCOFF()) {
 592     X86COFFMachineModuleInfo &COFFMMI =
 593       MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
 594
 595     // Emit type information for external functions
 596     typedef X86COFFMachineModuleInfo::externals_iterator externals_iterator;
 597     for (externals_iterator I = COFFMMI.externals_begin(),
 598                             E = COFFMMI.externals_end();
 599                             I != E; ++I) {
 600       OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
 601       OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
 602       OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
 603                                                << COFF::SCT_COMPLEX_TYPE_SHIFT);
 604       OutStreamer.EndCOFFSymbolDef();
 605     }
 606
 607     // Necessary for dllexport support
 608     std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
 609
 610     const TargetLoweringObjectFileCOFF &TLOFCOFF =
 611       static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
 612
 613     for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
 614       if (I->hasDLLExportLinkage())
 615         DLLExportedFns.push_back(Mang->getSymbol(I));
 616
 617     for (Module::const_global_iterator I = M.global_begin(),
 618            E = M.global_end(); I != E; ++I)
 619       if (I->hasDLLExportLinkage())
 620         DLLExportedGlobals.push_back(Mang->getSymbol(I));
 621
 622     // Output linker support code for dllexported globals on windows.
 623     if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
 624       OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
 625       SmallString<128> name;
 626       for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i) {
 627         if (Subtarget->isTargetWindows())
 628           name = " /EXPORT:";
 629         else
 630           name = " -export:";
 631         name += DLLExportedGlobals[i]->getName();
 632         if (Subtarget->isTargetWindows())
 633           name += ",DATA";
 634         else
 635         name += ",data";
 636         OutStreamer.EmitBytes(name, 0);
 637       }
 638
 639       for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i) {
 640         if (Subtarget->isTargetWindows())
 641           name = " /EXPORT:";
 642         else
 643           name = " -export:";
 644         name += DLLExportedFns[i]->getName();
 645         OutStreamer.EmitBytes(name, 0);
 646       }
 647     }
 648   }
 649
 650   if (Subtarget->isTargetELF()) {
 651     const TargetLoweringObjectFileELF &TLOFELF =
 652       static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
 653
 654     MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
 655
 656     // Output stubs for external and common global variables.
 657     MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
 658     if (!Stubs.empty()) {
 659       OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
 660       const TargetData *TD = TM.getTargetData();
 661
 662       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 663         OutStreamer.EmitLabel(Stubs[i].first);
 664         OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
 665                                     TD->getPointerSize(), 0);
 666       }
 667       Stubs.clear();
 668     }
 669   }
 670 }
 671
 672 MachineLocation
 673 X86AsmPrinter::getDebugValueLocation(const MachineInstr *MI) const {
 674   MachineLocation Location;
 675   assert (MI->getNumOperands() == 7 && "Invalid no. of machine operands!");
 676   // Frame address.  Currently handles register +- offset only.
 677
 678   if (MI->getOperand(0).isReg() && MI->getOperand(3).isImm())
 679     Location.set(MI->getOperand(0).getReg(), MI->getOperand(3).getImm());
 680   else {
 681     DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
 682   }
 683   return Location;
 684 }
 685
 686 void X86AsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
 687                                            raw_ostream &O) {
 688   // Only the target-dependent form of DBG_VALUE should get here.
 689   // Referencing the offset and metadata as NOps-2 and NOps-1 is
 690   // probably portable to other targets; frame pointer location is not.
 691   unsigned NOps = MI->getNumOperands();
 692   assert(NOps==7);
 693   O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
 694   // cast away const; DIetc do not take const operands for some reason.
 695   DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
 696   if (V.getContext().isSubprogram())
 697     O << DISubprogram(V.getContext()).getDisplayName() << ":";
 698   O << V.getName();
 699   O << " <- ";
 700   // Frame address.  Currently handles register +- offset only.
 701   O << '[';
 702   if (MI->getOperand(0).isReg() && MI->getOperand(0).getReg())
 703     printOperand(MI, 0, O);
 704   else
 705     O << "undef";
 706   O << '+'; printOperand(MI, 3, O);
 707   O << ']';
 708   O << "+";
 709   printOperand(MI, NOps-2, O);
 710 }
 711
 712
 713
 714 //===----------------------------------------------------------------------===//
 715 // Target Registry Stuff
 716 //===----------------------------------------------------------------------===//
 717
 718 static MCInstPrinter *createX86MCInstPrinter(const Target &T,
 719                                              unsigned SyntaxVariant,
 720                                              const MCAsmInfo &MAI) {
 721   if (SyntaxVariant == 0)
 722     return new X86ATTInstPrinter(MAI);
 723   if (SyntaxVariant == 1)
 724     return new X86IntelInstPrinter(MAI);
 725   return 0;
 726 }
 727
 728 // Force static initialization.
 729 extern "C" void LLVMInitializeX86AsmPrinter() {
 730   RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
 731   RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
 732
 733   TargetRegistry::RegisterMCInstPrinter(TheX86_32Target,createX86MCInstPrinter);
 734   TargetRegistry::RegisterMCInstPrinter(TheX86_64Target,createX86MCInstPrinter);
 735 }