lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp

   1 //===-- X86ATTAsmPrinter.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 AT&T format assembly
  12 // language. This printer is the output mechanism used by `llc'.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #define DEBUG_TYPE "asm-printer"
  17 #include "X86ATTAsmPrinter.h"
  18 #include "X86.h"
  19 #include "X86COFF.h"
  20 #include "X86MachineFunctionInfo.h"
  21 #include "X86TargetMachine.h"
  22 #include "X86TargetAsmInfo.h"
  23 #include "llvm/CallingConv.h"
  24 #include "llvm/DerivedTypes.h"
  25 #include "llvm/Module.h"
  26 #include "llvm/Type.h"
  27 #include "llvm/ADT/Statistic.h"
  28 #include "llvm/ADT/StringExtras.h"
  29 #include "llvm/CodeGen/DwarfWriter.h"
  30 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  31 #include "llvm/Support/Mangler.h"
  32 #include "llvm/Support/raw_ostream.h"
  33 #include "llvm/Target/TargetAsmInfo.h"
  34 #include "llvm/Target/TargetOptions.h"
  35 using namespace llvm;
  36
  37 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  38
  39 static std::string getPICLabelString(unsigned FnNum,
  40                                      const TargetAsmInfo *TAI,
  41                                      const X86Subtarget* Subtarget) {
  42   std::string label;
  43   if (Subtarget->isTargetDarwin())
  44     label =  "\"L" + utostr_32(FnNum) + "$pb\"";
  45   else if (Subtarget->isTargetELF())
  46     label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel";
  47   else
  48     assert(0 && "Don't know how to print PIC label!\n");
  49
  50   return label;
  51 }
  52
  53 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
  54                                                     const TargetData *TD) {
  55   X86MachineFunctionInfo Info;
  56   uint64_t Size = 0;
  57
  58   switch (F->getCallingConv()) {
  59   case CallingConv::X86_StdCall:
  60     Info.setDecorationStyle(StdCall);
  61     break;
  62   case CallingConv::X86_FastCall:
  63     Info.setDecorationStyle(FastCall);
  64     break;
  65   default:
  66     return Info;
  67   }
  68
  69   unsigned argNum = 1;
  70   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
  71        AI != AE; ++AI, ++argNum) {
  72     const Type* Ty = AI->getType();
  73
  74     // 'Dereference' type in case of byval parameter attribute
  75     if (F->paramHasAttr(argNum, Attribute::ByVal))
  76       Ty = cast<PointerType>(Ty)->getElementType();
  77
  78     // Size should be aligned to DWORD boundary
  79     Size += ((TD->getTypePaddedSize(Ty) + 3)/4)*4;
  80   }
  81
  82   // We're not supporting tooooo huge arguments :)
  83   Info.setBytesToPopOnReturn((unsigned int)Size);
  84   return Info;
  85 }
  86
  87 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
  88 /// Don't print things like \\n or \\0.
  89 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
  90   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
  91        Name != E; ++Name)
  92     if (isprint(*Name))
  93       OS << *Name;
  94 }
  95
  96 /// decorateName - Query FunctionInfoMap and use this information for various
  97 /// name decoration.
  98 void X86ATTAsmPrinter::decorateName(std::string &Name,
  99                                     const GlobalValue *GV) {
 100   const Function *F = dyn_cast<Function>(GV);
 101   if (!F) return;
 102
 103   // We don't want to decorate non-stdcall or non-fastcall functions right now
 104   unsigned CC = F->getCallingConv();
 105   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
 106     return;
 107
 108   // Decorate names only when we're targeting Cygwin/Mingw32 targets
 109   if (!Subtarget->isTargetCygMing())
 110     return;
 111
 112   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
 113
 114   const X86MachineFunctionInfo *Info;
 115   if (info_item == FunctionInfoMap.end()) {
 116     // Calculate apropriate function info and populate map
 117     FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
 118     Info = &FunctionInfoMap[F];
 119   } else {
 120     Info = &info_item->second;
 121   }
 122
 123   const FunctionType *FT = F->getFunctionType();
 124   switch (Info->getDecorationStyle()) {
 125   case None:
 126     break;
 127   case StdCall:
 128     // "Pure" variadic functions do not receive @0 suffix.
 129     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
 130         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 131       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
 132     break;
 133   case FastCall:
 134     // "Pure" variadic functions do not receive @0 suffix.
 135     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
 136         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 137       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
 138
 139     if (Name[0] == '_') {
 140       Name[0] = '@';
 141     } else {
 142       Name = '@' + Name;
 143     }
 144     break;
 145   default:
 146     assert(0 && "Unsupported DecorationStyle");
 147   }
 148 }
 149
 150 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 151   const Function *F = MF.getFunction();
 152
 153   decorateName(CurrentFnName, F);
 154
 155   SwitchToSection(TAI->SectionForGlobal(F));
 156
 157   unsigned FnAlign = 4;
 158   if (F->hasFnAttr(Attribute::OptimizeForSize))
 159     FnAlign = 1;
 160   switch (F->getLinkage()) {
 161   default: assert(0 && "Unknown linkage type!");
 162   case Function::InternalLinkage:  // Symbols default to internal.
 163   case Function::PrivateLinkage:
 164     EmitAlignment(FnAlign, F);
 165     break;
 166   case Function::DLLExportLinkage:
 167   case Function::ExternalLinkage:
 168     EmitAlignment(FnAlign, F);
 169     O << "\t.globl\t" << CurrentFnName << '\n';
 170     break;
 171   case Function::LinkOnceAnyLinkage:
 172   case Function::LinkOnceODRLinkage:
 173   case Function::WeakAnyLinkage:
 174   case Function::WeakODRLinkage:
 175     EmitAlignment(FnAlign, F);
 176     if (Subtarget->isTargetDarwin()) {
 177       O << "\t.globl\t" << CurrentFnName << '\n';
 178       O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
 179     } else if (Subtarget->isTargetCygMing()) {
 180       O << "\t.globl\t" << CurrentFnName << "\n"
 181            "\t.linkonce discard\n";
 182     } else {
 183       O << "\t.weak\t" << CurrentFnName << '\n';
 184     }
 185     break;
 186   }
 187
 188   printVisibility(CurrentFnName, F->getVisibility());
 189
 190   if (Subtarget->isTargetELF())
 191     O << "\t.type\t" << CurrentFnName << ",@function\n";
 192   else if (Subtarget->isTargetCygMing()) {
 193     O << "\t.def\t " << CurrentFnName
 194       << ";\t.scl\t" <<
 195       (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
 196       << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 197       << ";\t.endef\n";
 198   }
 199
 200   O << CurrentFnName << ":\n";
 201   // Add some workaround for linkonce linkage on Cygwin\MinGW
 202   if (Subtarget->isTargetCygMing() &&
 203       (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
 204     O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
 205 }
 206
 207 /// runOnMachineFunction - This uses the printMachineInstruction()
 208 /// method to print assembly for each instruction.
 209 ///
 210 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 211   const Function *F = MF.getFunction();
 212   this->MF = &MF;
 213   unsigned CC = F->getCallingConv();
 214
 215   SetupMachineFunction(MF);
 216   O << "\n\n";
 217
 218   // Populate function information map.  Actually, We don't want to populate
 219   // non-stdcall or non-fastcall functions' information right now.
 220   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
 221     FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
 222
 223   // Print out constants referenced by the function
 224   EmitConstantPool(MF.getConstantPool());
 225
 226   if (F->hasDLLExportLinkage())
 227     DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
 228
 229   // Print the 'header' of function
 230   emitFunctionHeader(MF);
 231
 232   // Emit pre-function debug and/or EH information.
 233   if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
 234     DW->BeginFunction(&MF);
 235
 236   // Print out code for the function.
 237   bool hasAnyRealCode = false;
 238   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 239        I != E; ++I) {
 240     // Print a label for the basic block.
 241     if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
 242       // This is an entry block or a block that's only reachable via a
 243       // fallthrough edge. In non-VerboseAsm mode, don't print the label.
 244     } else {
 245       printBasicBlockLabel(I, true, true, VerboseAsm);
 246       O << '\n';
 247     }
 248     for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
 249          II != IE; ++II) {
 250       // Print the assembly for the instruction.
 251       if (!II->isLabel())
 252         hasAnyRealCode = true;
 253       printMachineInstruction(II);
 254     }
 255   }
 256
 257   if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
 258     // If the function is empty, then we need to emit *something*. Otherwise,
 259     // the function's label might be associated with something that it wasn't
 260     // meant to be associated with. We emit a noop in this situation.
 261     // We are assuming inline asms are code.
 262     O << "\tnop\n";
 263   }
 264
 265   if (TAI->hasDotTypeDotSizeDirective())
 266     O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
 267
 268   // Emit post-function debug information.
 269   if (TAI->doesSupportDebugInformation())
 270     DW->EndFunction(&MF);
 271
 272   // Print out jump tables referenced by the function.
 273   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 274
 275   O.flush();
 276
 277   // We didn't modify anything.
 278   return false;
 279 }
 280
 281 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
 282   return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
 283 }
 284
 285 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
 286   return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
 287       (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
 288 }
 289
 290 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
 291   return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
 292 }
 293
 294 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 295                                     const char *Modifier, bool NotRIPRel) {
 296   const MachineOperand &MO = MI->getOperand(OpNo);
 297   switch (MO.getType()) {
 298   case MachineOperand::MO_Register: {
 299     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
 300            "Virtual registers should not make it this far!");
 301     O << '%';
 302     unsigned Reg = MO.getReg();
 303     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 304       MVT VT = (strcmp(Modifier+6,"64") == 0) ?
 305         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 306                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 307       Reg = getX86SubSuperRegister(Reg, VT);
 308     }
 309     O << TRI->getAsmName(Reg);
 310     return;
 311   }
 312
 313   case MachineOperand::MO_Immediate:
 314     if (!Modifier || (strcmp(Modifier, "debug") &&
 315                       strcmp(Modifier, "mem") &&
 316                       strcmp(Modifier, "call")))
 317       O << '$';
 318     O << MO.getImm();
 319     return;
 320   case MachineOperand::MO_MachineBasicBlock:
 321     printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
 322     return;
 323   case MachineOperand::MO_JumpTableIndex: {
 324     bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
 325     if (!isMemOp) O << '$';
 326     O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 327       << MO.getIndex();
 328
 329     if (TM.getRelocationModel() == Reloc::PIC_) {
 330       if (Subtarget->isPICStyleStub())
 331         O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
 332           << "$pb\"";
 333       else if (Subtarget->isPICStyleGOT())
 334         O << "@GOTOFF";
 335     }
 336
 337     if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
 338       O << "(%rip)";
 339     return;
 340   }
 341   case MachineOperand::MO_ConstantPoolIndex: {
 342     bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
 343     if (!isMemOp) O << '$';
 344     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 345       << MO.getIndex();
 346
 347     if (TM.getRelocationModel() == Reloc::PIC_) {
 348       if (Subtarget->isPICStyleStub())
 349         O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
 350           << "$pb\"";
 351       else if (Subtarget->isPICStyleGOT())
 352         O << "@GOTOFF";
 353     }
 354
 355     printOffset(MO.getOffset());
 356
 357     if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
 358       O << "(%rip)";
 359     return;
 360   }
 361   case MachineOperand::MO_GlobalAddress: {
 362     bool isCallOp = Modifier && !strcmp(Modifier, "call");
 363     bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
 364     bool needCloseParen = false;
 365
 366     const GlobalValue *GV = MO.getGlobal();
 367     const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
 368     if (!GVar) {
 369       // If GV is an alias then use the aliasee for determining
 370       // thread-localness.
 371       if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
 372         GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
 373     }
 374
 375     bool isThreadLocal = GVar && GVar->isThreadLocal();
 376
 377     std::string Name = Mang->getValueName(GV);
 378     decorateName(Name, GV);
 379
 380     if (!isMemOp && !isCallOp)
 381       O << '$';
 382     else if (Name[0] == '$') {
 383       // The name begins with a dollar-sign. In order to avoid having it look
 384       // like an integer immediate to the assembler, enclose it in parens.
 385       O << '(';
 386       needCloseParen = true;
 387     }
 388
 389     if (shouldPrintStub(TM, Subtarget)) {
 390       // Link-once, declaration, or Weakly-linked global variables need
 391       // non-lazily-resolved stubs
 392       if (GV->isDeclaration() || GV->isWeakForLinker()) {
 393         // Dynamically-resolved functions need a stub for the function.
 394         if (isCallOp && isa<Function>(GV)) {
 395           // Function stubs are no longer needed for Mac OS X 10.5 and up.
 396           if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
 397             O << Name;
 398           } else {
 399             FnStubs.insert(Name);
 400             printSuffixedName(Name, "$stub");
 401           }
 402         } else if (GV->hasHiddenVisibility()) {
 403           if (!GV->isDeclaration() && !GV->hasCommonLinkage())
 404             // Definition is not definitely in the current translation unit.
 405             O << Name;
 406           else {
 407             HiddenGVStubs.insert(Name);
 408             printSuffixedName(Name, "$non_lazy_ptr");
 409           }
 410         } else {
 411           GVStubs.insert(Name);
 412           printSuffixedName(Name, "$non_lazy_ptr");
 413         }
 414       } else {
 415         if (GV->hasDLLImportLinkage())
 416           O << "__imp_";
 417         O << Name;
 418       }
 419
 420       if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
 421         O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
 422     } else {
 423       if (GV->hasDLLImportLinkage()) {
 424         O << "__imp_";
 425       }
 426       O << Name;
 427
 428       if (isCallOp) {
 429         if (shouldPrintPLT(TM, Subtarget)) {
 430           // Assemble call via PLT for externally visible symbols
 431           if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
 432               !GV->hasLocalLinkage())
 433             O << "@PLT";
 434         }
 435         if (Subtarget->isTargetCygMing() && GV->isDeclaration())
 436           // Save function name for later type emission
 437           FnStubs.insert(Name);
 438       }
 439     }
 440
 441     if (GV->hasExternalWeakLinkage())
 442       ExtWeakSymbols.insert(GV);
 443
 444     printOffset(MO.getOffset());
 445
 446     if (isThreadLocal) {
 447       TLSModel::Model model = getTLSModel(GVar, TM.getRelocationModel());
 448       switch (model) {
 449       case TLSModel::GeneralDynamic:
 450         O << "@TLSGD";
 451         break;
 452       case TLSModel::LocalDynamic:
 453         // O << "@TLSLD"; // local dynamic not implemented
 454         O << "@TLSGD";
 455         break;
 456       case TLSModel::InitialExec:
 457         if (Subtarget->is64Bit())
 458           O << "@TLSGD"; // 64 bit intial exec not implemented
 459         else
 460           O << "@INDNTPOFF";
 461         break;
 462       case TLSModel::LocalExec:
 463         if (Subtarget->is64Bit())
 464           O << "@TLSGD"; // 64 bit local exec not implemented
 465         else
 466           O << "@NTPOFF";
 467         break;
 468       default:
 469         assert (0 && "Unknown TLS model");
 470       }
 471     } else if (isMemOp) {
 472       if (shouldPrintGOT(TM, Subtarget)) {
 473         if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
 474           O << "@GOT";
 475         else
 476           O << "@GOTOFF";
 477       } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) {
 478         if (TM.getRelocationModel() != Reloc::Static) {
 479           if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
 480             O << "@GOTPCREL";
 481
 482           if (needCloseParen) {
 483             needCloseParen = false;
 484             O << ')';
 485           }
 486         }
 487
 488         // Use rip when possible to reduce code size, except when
 489         // index or base register are also part of the address. e.g.
 490         // foo(%rip)(%rcx,%rax,4) is not legal
 491         O << "(%rip)";
 492       }
 493     }
 494
 495     if (needCloseParen)
 496       O << ')';
 497
 498     return;
 499   }
 500   case MachineOperand::MO_ExternalSymbol: {
 501     bool isCallOp = Modifier && !strcmp(Modifier, "call");
 502     bool needCloseParen = false;
 503     std::string Name(TAI->getGlobalPrefix());
 504     Name += MO.getSymbolName();
 505     // Print function stub suffix unless it's Mac OS X 10.5 and up.
 506     if (isCallOp && shouldPrintStub(TM, Subtarget) &&
 507         !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
 508       FnStubs.insert(Name);
 509       printSuffixedName(Name, "$stub");
 510       return;
 511     }
 512     if (!isCallOp)
 513       O << '$';
 514     else if (Name[0] == '$') {
 515       // The name begins with a dollar-sign. In order to avoid having it look
 516       // like an integer immediate to the assembler, enclose it in parens.
 517       O << '(';
 518       needCloseParen = true;
 519     }
 520
 521     O << Name;
 522
 523     if (shouldPrintPLT(TM, Subtarget)) {
 524       std::string GOTName(TAI->getGlobalPrefix());
 525       GOTName+="_GLOBAL_OFFSET_TABLE_";
 526       if (Name == GOTName)
 527         // HACK! Emit extra offset to PC during printing GOT offset to
 528         // compensate for the size of popl instruction. The resulting code
 529         // should look like:
 530         //   call .piclabel
 531         // piclabel:
 532         //   popl %some_register
 533         //   addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
 534         O << " + [.-"
 535           << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
 536
 537       if (isCallOp)
 538         O << "@PLT";
 539     }
 540
 541     if (needCloseParen)
 542       O << ')';
 543
 544     if (!isCallOp && Subtarget->isPICStyleRIPRel())
 545       O << "(%rip)";
 546
 547     return;
 548   }
 549   default:
 550     O << "<unknown operand type>"; return;
 551   }
 552 }
 553
 554 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
 555   unsigned char value = MI->getOperand(Op).getImm();
 556   assert(value <= 7 && "Invalid ssecc argument!");
 557   switch (value) {
 558   case 0: O << "eq"; break;
 559   case 1: O << "lt"; break;
 560   case 2: O << "le"; break;
 561   case 3: O << "unord"; break;
 562   case 4: O << "neq"; break;
 563   case 5: O << "nlt"; break;
 564   case 6: O << "nle"; break;
 565   case 7: O << "ord"; break;
 566   }
 567 }
 568
 569 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 570                                          const char *Modifier){
 571   assert(isMem(MI, Op) && "Invalid memory reference!");
 572   MachineOperand BaseReg  = MI->getOperand(Op);
 573   MachineOperand IndexReg = MI->getOperand(Op+2);
 574   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 575
 576   bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg();
 577   if (DispSpec.isGlobal() ||
 578       DispSpec.isCPI() ||
 579       DispSpec.isJTI()) {
 580     printOperand(MI, Op+3, "mem", NotRIPRel);
 581   } else {
 582     int DispVal = DispSpec.getImm();
 583     if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
 584       O << DispVal;
 585   }
 586
 587   if (IndexReg.getReg() || BaseReg.getReg()) {
 588     unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 589     unsigned BaseRegOperand = 0, IndexRegOperand = 2;
 590
 591     // There are cases where we can end up with ESP/RSP in the indexreg slot.
 592     // If this happens, swap the base/index register to support assemblers that
 593     // don't work when the index is *SP.
 594     if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
 595       assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
 596       std::swap(BaseReg, IndexReg);
 597       std::swap(BaseRegOperand, IndexRegOperand);
 598     }
 599
 600     O << '(';
 601     if (BaseReg.getReg())
 602       printOperand(MI, Op+BaseRegOperand, Modifier);
 603
 604     if (IndexReg.getReg()) {
 605       O << ',';
 606       printOperand(MI, Op+IndexRegOperand, Modifier);
 607       if (ScaleVal != 1)
 608         O << ',' << ScaleVal;
 609     }
 610     O << ')';
 611   }
 612 }
 613
 614 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
 615                                            const MachineBasicBlock *MBB) const {
 616   if (!TAI->getSetDirective())
 617     return;
 618
 619   // We don't need .set machinery if we have GOT-style relocations
 620   if (Subtarget->isPICStyleGOT())
 621     return;
 622
 623   O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
 624     << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
 625   printBasicBlockLabel(MBB, false, false, false);
 626   if (Subtarget->isPICStyleRIPRel())
 627     O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 628       << '_' << uid << '\n';
 629   else
 630     O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
 631 }
 632
 633 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
 634   std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
 635   O << label << '\n' << label << ':';
 636 }
 637
 638
 639 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
 640                                               const MachineBasicBlock *MBB,
 641                                               unsigned uid) const
 642 {
 643   const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
 644     TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
 645
 646   O << JTEntryDirective << ' ';
 647
 648   if (TM.getRelocationModel() == Reloc::PIC_) {
 649     if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
 650       O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
 651         << '_' << uid << "_set_" << MBB->getNumber();
 652     } else if (Subtarget->isPICStyleGOT()) {
 653       printBasicBlockLabel(MBB, false, false, false);
 654       O << "@GOTOFF";
 655     } else
 656       assert(0 && "Don't know how to print MBB label for this PIC mode");
 657   } else
 658     printBasicBlockLabel(MBB, false, false, false);
 659 }
 660
 661 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
 662                                          const char Mode) {
 663   unsigned Reg = MO.getReg();
 664   switch (Mode) {
 665   default: return true;  // Unknown mode.
 666   case 'b': // Print QImode register
 667     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 668     break;
 669   case 'h': // Print QImode high register
 670     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 671     break;
 672   case 'w': // Print HImode register
 673     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 674     break;
 675   case 'k': // Print SImode register
 676     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 677     break;
 678   case 'q': // Print DImode register
 679     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 680     break;
 681   }
 682
 683   O << '%'<< TRI->getAsmName(Reg);
 684   return false;
 685 }
 686
 687 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 688 ///
 689 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 690                                        unsigned AsmVariant,
 691                                        const char *ExtraCode) {
 692   // Does this asm operand have a single letter operand modifier?
 693   if (ExtraCode && ExtraCode[0]) {
 694     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 695
 696     switch (ExtraCode[0]) {
 697     default: return true;  // Unknown modifier.
 698     case 'c': // Don't print "$" before a global var name or constant.
 699       printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
 700       return false;
 701     case 'b': // Print QImode register
 702     case 'h': // Print QImode high register
 703     case 'w': // Print HImode register
 704     case 'k': // Print SImode register
 705     case 'q': // Print DImode register
 706       if (MI->getOperand(OpNo).isReg())
 707         return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
 708       printOperand(MI, OpNo);
 709       return false;
 710
 711     case 'P': // Don't print @PLT, but do print as memory.
 712       printOperand(MI, OpNo, "mem");
 713       return false;
 714     }
 715   }
 716
 717   printOperand(MI, OpNo);
 718   return false;
 719 }
 720
 721 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 722                                              unsigned OpNo,
 723                                              unsigned AsmVariant,
 724                                              const char *ExtraCode) {
 725   if (ExtraCode && ExtraCode[0]) {
 726     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 727
 728     switch (ExtraCode[0]) {
 729     default: return true;  // Unknown modifier.
 730     case 'b': // Print QImode register
 731     case 'h': // Print QImode high register
 732     case 'w': // Print HImode register
 733     case 'k': // Print SImode register
 734     case 'q': // Print SImode register
 735       // These only apply to registers, ignore on mem.
 736       break;
 737     case 'P': // Don't print @PLT, but do print as memory.
 738       printOperand(MI, OpNo, "mem");
 739       return false;
 740     }
 741   }
 742   printMemReference(MI, OpNo);
 743   return false;
 744 }
 745
 746 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
 747 /// AT&T syntax to the current output stream.
 748 ///
 749 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 750   ++EmittedInsts;
 751
 752   // Call the autogenerated instruction printer routines.
 753   printInstruction(MI);
 754 }
 755
 756 /// doInitialization
 757 bool X86ATTAsmPrinter::doInitialization(Module &M) {
 758
 759   bool Result = AsmPrinter::doInitialization(M);
 760
 761   if (TAI->doesSupportDebugInformation()) {
 762     // Let PassManager know we need debug information and relay
 763     // the MachineModuleInfo address on to DwarfWriter.
 764     // AsmPrinter::doInitialization did this analysis.
 765     MMI = getAnalysisIfAvailable<MachineModuleInfo>();
 766     DW = getAnalysisIfAvailable<DwarfWriter>();
 767     DW->BeginModule(&M, MMI, O, this, TAI);
 768   }
 769
 770   // Darwin wants symbols to be quoted if they have complex names.
 771   if (Subtarget->isTargetDarwin())
 772     Mang->setUseQuotes(true);
 773
 774   return Result;
 775 }
 776
 777
 778 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
 779   const TargetData *TD = TM.getTargetData();
 780
 781   if (!GVar->hasInitializer())
 782     return;   // External global require no code
 783
 784   // Check to see if this is a special global used by LLVM, if so, emit it.
 785   if (EmitSpecialLLVMGlobal(GVar)) {
 786     if (Subtarget->isTargetDarwin() &&
 787         TM.getRelocationModel() == Reloc::Static) {
 788       if (GVar->getName() == "llvm.global_ctors")
 789         O << ".reference .constructors_used\n";
 790       else if (GVar->getName() == "llvm.global_dtors")
 791         O << ".reference .destructors_used\n";
 792     }
 793     return;
 794   }
 795
 796   std::string name = Mang->getValueName(GVar);
 797   Constant *C = GVar->getInitializer();
 798   const Type *Type = C->getType();
 799   unsigned Size = TD->getTypePaddedSize(Type);
 800   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 801
 802   printVisibility(name, GVar->getVisibility());
 803
 804   if (Subtarget->isTargetELF())
 805     O << "\t.type\t" << name << ",@object\n";
 806
 807   SwitchToSection(TAI->SectionForGlobal(GVar));
 808
 809   if (C->isNullValue() && !GVar->hasSection() &&
 810       !(Subtarget->isTargetDarwin() &&
 811         TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
 812     // FIXME: This seems to be pretty darwin-specific
 813     if (GVar->hasExternalLinkage()) {
 814       if (const char *Directive = TAI->getZeroFillDirective()) {
 815         O << "\t.globl " << name << '\n';
 816         O << Directive << "__DATA, __common, " << name << ", "
 817           << Size << ", " << Align << '\n';
 818         return;
 819       }
 820     }
 821
 822     if (!GVar->isThreadLocal() &&
 823         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 824       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 825
 826       if (TAI->getLCOMMDirective() != NULL) {
 827         if (GVar->hasLocalLinkage()) {
 828           O << TAI->getLCOMMDirective() << name << ',' << Size;
 829           if (Subtarget->isTargetDarwin())
 830             O << ',' << Align;
 831         } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
 832           O << "\t.globl " << name << '\n'
 833             << TAI->getWeakDefDirective() << name << '\n';
 834           EmitAlignment(Align, GVar);
 835           O << name << ":";
 836           if (VerboseAsm) {
 837             O << "\t\t\t\t" << TAI->getCommentString() << ' ';
 838             PrintUnmangledNameSafely(GVar, O);
 839           }
 840           O << '\n';
 841           EmitGlobalConstant(C);
 842           return;
 843         } else {
 844           O << TAI->getCOMMDirective()  << name << ',' << Size;
 845           if (TAI->getCOMMDirectiveTakesAlignment())
 846             O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 847         }
 848       } else {
 849         if (!Subtarget->isTargetCygMing()) {
 850           if (GVar->hasLocalLinkage())
 851             O << "\t.local\t" << name << '\n';
 852         }
 853         O << TAI->getCOMMDirective()  << name << ',' << Size;
 854         if (TAI->getCOMMDirectiveTakesAlignment())
 855           O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 856       }
 857       if (VerboseAsm) {
 858         O << "\t\t" << TAI->getCommentString() << ' ';
 859         PrintUnmangledNameSafely(GVar, O);
 860       }
 861       O << '\n';
 862       return;
 863     }
 864   }
 865
 866   switch (GVar->getLinkage()) {
 867   case GlobalValue::CommonLinkage:
 868   case GlobalValue::LinkOnceAnyLinkage:
 869   case GlobalValue::LinkOnceODRLinkage:
 870   case GlobalValue::WeakAnyLinkage:
 871   case GlobalValue::WeakODRLinkage:
 872     if (Subtarget->isTargetDarwin()) {
 873       O << "\t.globl " << name << '\n'
 874         << TAI->getWeakDefDirective() << name << '\n';
 875     } else if (Subtarget->isTargetCygMing()) {
 876       O << "\t.globl\t" << name << "\n"
 877            "\t.linkonce same_size\n";
 878     } else {
 879       O << "\t.weak\t" << name << '\n';
 880     }
 881     break;
 882   case GlobalValue::DLLExportLinkage:
 883   case GlobalValue::AppendingLinkage:
 884     // FIXME: appending linkage variables should go into a section of
 885     // their name or something.  For now, just emit them as external.
 886   case GlobalValue::ExternalLinkage:
 887     // If external or appending, declare as a global symbol
 888     O << "\t.globl " << name << '\n';
 889     // FALL THROUGH
 890   case GlobalValue::PrivateLinkage:
 891   case GlobalValue::InternalLinkage:
 892      break;
 893   default:
 894     assert(0 && "Unknown linkage type!");
 895   }
 896
 897   EmitAlignment(Align, GVar);
 898   O << name << ":";
 899   if (VerboseAsm){
 900     O << "\t\t\t\t" << TAI->getCommentString() << ' ';
 901     PrintUnmangledNameSafely(GVar, O);
 902   }
 903   O << '\n';
 904   if (TAI->hasDotTypeDotSizeDirective())
 905     O << "\t.size\t" << name << ", " << Size << '\n';
 906
 907   EmitGlobalConstant(C);
 908 }
 909
 910 /// printGVStub - Print stub for a global value.
 911 ///
 912 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
 913   printSuffixedName(GV, "$non_lazy_ptr", Prefix);
 914   O << ":\n\t.indirect_symbol ";
 915   if (Prefix) O << Prefix;
 916   O << GV << "\n\t.long\t0\n";
 917 }
 918
 919 /// printHiddenGVStub - Print stub for a hidden global value.
 920 ///
 921 void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) {
 922   EmitAlignment(2);
 923   printSuffixedName(GV, "$non_lazy_ptr", Prefix);
 924   if (Prefix) O << Prefix;
 925   O << ":\n" << TAI->getData32bitsDirective() << GV << '\n';
 926 }
 927
 928
 929 bool X86ATTAsmPrinter::doFinalization(Module &M) {
 930   // Print out module-level global variables here.
 931   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 932        I != E; ++I) {
 933     printModuleLevelGV(I);
 934
 935     if (I->hasDLLExportLinkage())
 936       DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
 937
 938     // If the global is a extern weak symbol, remember to emit the weak
 939     // reference!
 940     // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
 941     // not used. But currently it's the only way to deal with extern weak
 942     // initializers hidden deep inside constant expressions.
 943     if (I->hasExternalWeakLinkage())
 944       ExtWeakSymbols.insert(I);
 945   }
 946
 947   for (Module::const_iterator I = M.begin(), E = M.end();
 948        I != E; ++I) {
 949     // If the global is a extern weak symbol, remember to emit the weak
 950     // reference!
 951     // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
 952     // not used. But currently it's the only way to deal with extern weak
 953     // initializers hidden deep inside constant expressions.
 954     if (I->hasExternalWeakLinkage())
 955       ExtWeakSymbols.insert(I);
 956   }
 957
 958   // Output linker support code for dllexported globals
 959   if (!DLLExportedGVs.empty())
 960     SwitchToDataSection(".section .drectve");
 961
 962   for (StringSet<>::iterator i = DLLExportedGVs.begin(),
 963          e = DLLExportedGVs.end();
 964          i != e; ++i)
 965     O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
 966
 967   if (!DLLExportedFns.empty()) {
 968     SwitchToDataSection(".section .drectve");
 969   }
 970
 971   for (StringSet<>::iterator i = DLLExportedFns.begin(),
 972          e = DLLExportedFns.end();
 973          i != e; ++i)
 974     O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
 975
 976   if (Subtarget->isTargetDarwin()) {
 977     SwitchToDataSection("");
 978
 979     // Output stubs for dynamically-linked functions
 980     for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
 981          i != e; ++i) {
 982       SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
 983                           "self_modifying_code+pure_instructions,5", 0);
 984       const char *p = i->getKeyData();
 985       printSuffixedName(p, "$stub");
 986       O << ":\n"
 987            "\t.indirect_symbol " << p << "\n"
 988            "\thlt ; hlt ; hlt ; hlt ; hlt\n";
 989     }
 990
 991     O << '\n';
 992
 993     // Print global value stubs.
 994     bool InStubSection = false;
 995     if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
 996       // Add the (possibly multiple) personalities to the set of global values.
 997       // Only referenced functions get into the Personalities list.
 998       const std::vector<Function *>& Personalities = MMI->getPersonalities();
 999       for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1000              E = Personalities.end(); I != E; ++I) {
1001         if (!*I)
1002           continue;
1003         if (!InStubSection) {
1004           SwitchToDataSection(
1005                      "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1006           InStubSection = true;
1007         }
1008         printGVStub((*I)->getNameStart(), "_");
1009       }
1010     }
1011
1012     // Output stubs for external and common global variables.
1013     if (!InStubSection && !GVStubs.empty())
1014       SwitchToDataSection(
1015                     "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1016     for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
1017          i != e; ++i)
1018       printGVStub(i->getKeyData());
1019
1020     if (!HiddenGVStubs.empty()) {
1021       SwitchToSection(TAI->getDataSection());
1022       for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
1023            i != e; ++i)
1024         printHiddenGVStub(i->getKeyData());
1025     }
1026
1027     // Emit final debug information.
1028     DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1029     DW->EndModule();
1030
1031     // Funny Darwin hack: This flag tells the linker that no global symbols
1032     // contain code that falls through to other global symbols (e.g. the obvious
1033     // implementation of multiple entry points).  If this doesn't occur, the
1034     // linker can safely perform dead code stripping.  Since LLVM never
1035     // generates code that does this, it is always safe to set.
1036     O << "\t.subsections_via_symbols\n";
1037   } else if (Subtarget->isTargetCygMing()) {
1038     // Emit type information for external functions
1039     for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1040          i != e; ++i) {
1041       O << "\t.def\t " << i->getKeyData()
1042         << ";\t.scl\t" << COFF::C_EXT
1043         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1044         << ";\t.endef\n";
1045     }
1046
1047     // Emit final debug information.
1048     DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1049     DW->EndModule();
1050   } else if (Subtarget->isTargetELF()) {
1051     // Emit final debug information.
1052     DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1053     DW->EndModule();
1054   }
1055
1056   return AsmPrinter::doFinalization(M);
1057 }
1058
1059 // Include the auto-generated portion of the assembly writer.
1060 #include "X86GenAsmWriter.inc"