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/MDNode.h"
  27 #include "llvm/Type.h"
  28 #include "llvm/ADT/Statistic.h"
  29 #include "llvm/ADT/StringExtras.h"
  30 #include "llvm/MC/MCContext.h"
  31 #include "llvm/MC/MCInst.h"
  32 #include "llvm/MC/MCStreamer.h"
  33 #include "llvm/CodeGen/DwarfWriter.h"
  34 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  35 #include "llvm/Support/CommandLine.h"
  36 #include "llvm/Support/ErrorHandling.h"
  37 #include "llvm/Support/FormattedStream.h"
  38 #include "llvm/Support/Mangler.h"
  39 #include "llvm/Target/TargetAsmInfo.h"
  40 #include "llvm/Target/TargetOptions.h"
  41 using namespace llvm;
  42
  43 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  44
  45 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
  46                                    cl::Hidden);
  47
  48 //===----------------------------------------------------------------------===//
  49 // Primitive Helper Functions.
  50 //===----------------------------------------------------------------------===//
  51
  52 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
  53   if (Subtarget->isTargetDarwin())
  54     O << "\"L" << getFunctionNumber() << "$pb\"";
  55   else if (Subtarget->isTargetELF())
  56     O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
  57   else
  58     llvm_unreachable("Don't know how to print PIC label!");
  59 }
  60
  61 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
  62 /// Don't print things like \\n or \\0.
  63 static void PrintUnmangledNameSafely(const Value *V,
  64                                      formatted_raw_ostream &OS) {
  65   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
  66        Name != E; ++Name)
  67     if (isprint(*Name))
  68       OS << *Name;
  69 }
  70
  71 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
  72                                                     const TargetData *TD) {
  73   X86MachineFunctionInfo Info;
  74   uint64_t Size = 0;
  75
  76   switch (F->getCallingConv()) {
  77   case CallingConv::X86_StdCall:
  78     Info.setDecorationStyle(StdCall);
  79     break;
  80   case CallingConv::X86_FastCall:
  81     Info.setDecorationStyle(FastCall);
  82     break;
  83   default:
  84     return Info;
  85   }
  86
  87   unsigned argNum = 1;
  88   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
  89        AI != AE; ++AI, ++argNum) {
  90     const Type* Ty = AI->getType();
  91
  92     // 'Dereference' type in case of byval parameter attribute
  93     if (F->paramHasAttr(argNum, Attribute::ByVal))
  94       Ty = cast<PointerType>(Ty)->getElementType();
  95
  96     // Size should be aligned to DWORD boundary
  97     Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
  98   }
  99
 100   // We're not supporting tooooo huge arguments :)
 101   Info.setBytesToPopOnReturn((unsigned int)Size);
 102   return Info;
 103 }
 104
 105 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
 106 /// various name decorations for Cygwin and MingW.
 107 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
 108                                            const GlobalValue *GV) {
 109   assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
 110
 111   const Function *F = dyn_cast<Function>(GV);
 112   if (!F) return;
 113
 114   // Save function name for later type emission.
 115   if (F->isDeclaration())
 116     CygMingStubs.insert(Name);
 117
 118   // We don't want to decorate non-stdcall or non-fastcall functions right now
 119   unsigned CC = F->getCallingConv();
 120   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
 121     return;
 122
 123
 124   const X86MachineFunctionInfo *Info;
 125
 126   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
 127   if (info_item == FunctionInfoMap.end()) {
 128     // Calculate apropriate function info and populate map
 129     FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
 130     Info = &FunctionInfoMap[F];
 131   } else {
 132     Info = &info_item->second;
 133   }
 134
 135   const FunctionType *FT = F->getFunctionType();
 136   switch (Info->getDecorationStyle()) {
 137   case None:
 138     break;
 139   case StdCall:
 140     // "Pure" variadic functions do not receive @0 suffix.
 141     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
 142         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 143       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
 144     break;
 145   case FastCall:
 146     // "Pure" variadic functions do not receive @0 suffix.
 147     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
 148         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 149       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
 150
 151     if (Name[0] == '_') {
 152       Name[0] = '@';
 153     } else {
 154       Name = '@' + Name;
 155     }
 156     break;
 157   default:
 158     llvm_unreachable("Unsupported DecorationStyle");
 159   }
 160 }
 161
 162 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 163   unsigned FnAlign = MF.getAlignment();
 164   const Function *F = MF.getFunction();
 165
 166   if (Subtarget->isTargetCygMing())
 167     DecorateCygMingName(CurrentFnName, F);
 168
 169   SwitchToSection(TAI->SectionForGlobal(F));
 170   switch (F->getLinkage()) {
 171   default: llvm_unreachable("Unknown linkage type!");
 172   case Function::InternalLinkage:  // Symbols default to internal.
 173   case Function::PrivateLinkage:
 174     EmitAlignment(FnAlign, F);
 175     break;
 176   case Function::DLLExportLinkage:
 177   case Function::ExternalLinkage:
 178     EmitAlignment(FnAlign, F);
 179     O << "\t.globl\t" << CurrentFnName << '\n';
 180     break;
 181   case Function::LinkOnceAnyLinkage:
 182   case Function::LinkOnceODRLinkage:
 183   case Function::WeakAnyLinkage:
 184   case Function::WeakODRLinkage:
 185     EmitAlignment(FnAlign, F);
 186     if (Subtarget->isTargetDarwin()) {
 187       O << "\t.globl\t" << CurrentFnName << '\n';
 188       O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
 189     } else if (Subtarget->isTargetCygMing()) {
 190       O << "\t.globl\t" << CurrentFnName << "\n"
 191            "\t.linkonce discard\n";
 192     } else {
 193       O << "\t.weak\t" << CurrentFnName << '\n';
 194     }
 195     break;
 196   }
 197
 198   printVisibility(CurrentFnName, F->getVisibility());
 199
 200   if (Subtarget->isTargetELF())
 201     O << "\t.type\t" << CurrentFnName << ",@function\n";
 202   else if (Subtarget->isTargetCygMing()) {
 203     O << "\t.def\t " << CurrentFnName
 204       << ";\t.scl\t" <<
 205       (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
 206       << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 207       << ";\t.endef\n";
 208   }
 209
 210   O << CurrentFnName << ":\n";
 211   // Add some workaround for linkonce linkage on Cygwin\MinGW
 212   if (Subtarget->isTargetCygMing() &&
 213       (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
 214     O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
 215 }
 216
 217 /// runOnMachineFunction - This uses the printMachineInstruction()
 218 /// method to print assembly for each instruction.
 219 ///
 220 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 221   const Function *F = MF.getFunction();
 222   this->MF = &MF;
 223   unsigned CC = F->getCallingConv();
 224
 225   SetupMachineFunction(MF);
 226   O << "\n\n";
 227
 228   // Populate function information map.  Actually, We don't want to populate
 229   // non-stdcall or non-fastcall functions' information right now.
 230   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
 231     FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
 232
 233   // Print out constants referenced by the function
 234   EmitConstantPool(MF.getConstantPool());
 235
 236   if (F->hasDLLExportLinkage())
 237     DLLExportedFns.insert(Mang->getMangledName(F));
 238
 239   // Print the 'header' of function
 240   emitFunctionHeader(MF);
 241
 242   // Emit pre-function debug and/or EH information.
 243   if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
 244     DW->BeginFunction(&MF);
 245
 246   // Print out code for the function.
 247   bool hasAnyRealCode = false;
 248   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 249        I != E; ++I) {
 250     // Print a label for the basic block.
 251     if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
 252       // This is an entry block or a block that's only reachable via a
 253       // fallthrough edge. In non-VerboseAsm mode, don't print the label.
 254     } else {
 255       printBasicBlockLabel(I, true, true, VerboseAsm);
 256       O << '\n';
 257     }
 258     for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
 259          II != IE; ++II) {
 260       // Print the assembly for the instruction.
 261       if (!II->isLabel())
 262         hasAnyRealCode = true;
 263       printMachineInstruction(II);
 264     }
 265   }
 266
 267   if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
 268     // If the function is empty, then we need to emit *something*. Otherwise,
 269     // the function's label might be associated with something that it wasn't
 270     // meant to be associated with. We emit a noop in this situation.
 271     // We are assuming inline asms are code.
 272     O << "\tnop\n";
 273   }
 274
 275   if (TAI->hasDotTypeDotSizeDirective())
 276     O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
 277
 278   // Emit post-function debug information.
 279   if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
 280     DW->EndFunction(&MF);
 281
 282   // Print out jump tables referenced by the function.
 283   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 284
 285   O.flush();
 286
 287   // We didn't modify anything.
 288   return false;
 289 }
 290
 291 /// printSymbolOperand - Print a raw symbol reference operand.  This handles
 292 /// jump tables, constant pools, global address and external symbols, all of
 293 /// which print to a label with various suffixes for relocation types etc.
 294 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
 295   switch (MO.getType()) {
 296   default: llvm_unreachable("unknown symbol type!");
 297   case MachineOperand::MO_JumpTableIndex:
 298     O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 299       << MO.getIndex();
 300     break;
 301   case MachineOperand::MO_ConstantPoolIndex:
 302     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 303       << MO.getIndex();
 304     printOffset(MO.getOffset());
 305     break;
 306   case MachineOperand::MO_GlobalAddress: {
 307     const GlobalValue *GV = MO.getGlobal();
 308
 309     const char *Suffix = "";
 310     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 311       Suffix = "$stub";
 312     else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 313              MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
 314              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
 315              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 316       Suffix = "$non_lazy_ptr";
 317
 318     std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
 319     if (Subtarget->isTargetCygMing())
 320       DecorateCygMingName(Name, GV);
 321
 322     // Handle dllimport linkage.
 323     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
 324       Name = "__imp_" + Name;
 325
 326     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 327         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
 328       GVStubs[Name] = Mang->getMangledName(GV);
 329     else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
 330              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 331       HiddenGVStubs[Name] = Mang->getMangledName(GV);
 332     else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 333       FnStubs[Name] = Mang->getMangledName(GV);
 334
 335     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 336     // to avoid having it look like an integer immediate to the assembler.
 337     if (Name[0] == '$')
 338       O << '(' << Name << ')';
 339     else
 340       O << Name;
 341
 342     printOffset(MO.getOffset());
 343     break;
 344   }
 345   case MachineOperand::MO_ExternalSymbol: {
 346     std::string Name = Mang->makeNameProper(MO.getSymbolName());
 347     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 348       FnStubs[Name+"$stub"] = Name;
 349       Name += "$stub";
 350     }
 351
 352     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 353     // to avoid having it look like an integer immediate to the assembler.
 354     if (Name[0] == '$')
 355       O << '(' << Name << ')';
 356     else
 357       O << Name;
 358     break;
 359   }
 360   }
 361
 362   switch (MO.getTargetFlags()) {
 363   default:
 364     llvm_unreachable("Unknown target flag on GV operand");
 365   case X86II::MO_NO_FLAG:    // No flag.
 366     break;
 367   case X86II::MO_DARWIN_NONLAZY:
 368   case X86II::MO_DARWIN_HIDDEN_NONLAZY:
 369   case X86II::MO_DLLIMPORT:
 370   case X86II::MO_DARWIN_STUB:
 371     // These affect the name of the symbol, not any suffix.
 372     break;
 373   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
 374     O << " + [.-";
 375     PrintPICBaseSymbol();
 376     O << ']';
 377     break;
 378   case X86II::MO_PIC_BASE_OFFSET:
 379   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
 380   case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
 381     O << '-';
 382     PrintPICBaseSymbol();
 383     break;
 384   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
 385   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
 386   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
 387   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
 388   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
 389   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
 390   case X86II::MO_GOT:       O << "@GOT";       break;
 391   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
 392   case X86II::MO_PLT:       O << "@PLT";       break;
 393   }
 394 }
 395
 396 /// print_pcrel_imm - This is used to print an immediate value that ends up
 397 /// being encoded as a pc-relative value.  These print slightly differently, for
 398 /// example, a $ is not emitted.
 399 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
 400   const MachineOperand &MO = MI->getOperand(OpNo);
 401   switch (MO.getType()) {
 402   default: llvm_unreachable("Unknown pcrel immediate operand");
 403   case MachineOperand::MO_Immediate:
 404     O << MO.getImm();
 405     return;
 406   case MachineOperand::MO_MachineBasicBlock:
 407     printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
 408     return;
 409   case MachineOperand::MO_GlobalAddress:
 410   case MachineOperand::MO_ExternalSymbol:
 411     printSymbolOperand(MO);
 412     return;
 413   }
 414 }
 415
 416
 417
 418 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 419                                     const char *Modifier) {
 420   const MachineOperand &MO = MI->getOperand(OpNo);
 421   switch (MO.getType()) {
 422   default: llvm_unreachable("unknown operand type!");
 423   case MachineOperand::MO_Register: {
 424     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
 425            "Virtual registers should not make it this far!");
 426     O << '%';
 427     unsigned Reg = MO.getReg();
 428     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 429       MVT VT = (strcmp(Modifier+6,"64") == 0) ?
 430         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 431                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 432       Reg = getX86SubSuperRegister(Reg, VT);
 433     }
 434     O << TRI->getAsmName(Reg);
 435     return;
 436   }
 437
 438   case MachineOperand::MO_Immediate:
 439     O << '$' << MO.getImm();
 440     return;
 441
 442   case MachineOperand::MO_JumpTableIndex:
 443   case MachineOperand::MO_ConstantPoolIndex:
 444   case MachineOperand::MO_GlobalAddress:
 445   case MachineOperand::MO_ExternalSymbol: {
 446     O << '$';
 447     printSymbolOperand(MO);
 448     break;
 449   }
 450   }
 451 }
 452
 453 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
 454   unsigned char value = MI->getOperand(Op).getImm();
 455   assert(value <= 7 && "Invalid ssecc argument!");
 456   switch (value) {
 457   case 0: O << "eq"; break;
 458   case 1: O << "lt"; break;
 459   case 2: O << "le"; break;
 460   case 3: O << "unord"; break;
 461   case 4: O << "neq"; break;
 462   case 5: O << "nlt"; break;
 463   case 6: O << "nle"; break;
 464   case 7: O << "ord"; break;
 465   }
 466 }
 467
 468 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
 469                                             const char *Modifier) {
 470   const MachineOperand &BaseReg  = MI->getOperand(Op);
 471   const MachineOperand &IndexReg = MI->getOperand(Op+2);
 472   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 473
 474   // If we really don't want to print out (rip), don't.
 475   bool HasBaseReg = BaseReg.getReg() != 0;
 476   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
 477       BaseReg.getReg() == X86::RIP)
 478     HasBaseReg = false;
 479
 480   // HasParenPart - True if we will print out the () part of the mem ref.
 481   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
 482
 483   if (DispSpec.isImm()) {
 484     int DispVal = DispSpec.getImm();
 485     if (DispVal || !HasParenPart)
 486       O << DispVal;
 487   } else {
 488     assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 489            DispSpec.isJTI() || DispSpec.isSymbol());
 490     printSymbolOperand(MI->getOperand(Op+3));
 491   }
 492
 493   if (HasParenPart) {
 494     assert(IndexReg.getReg() != X86::ESP &&
 495            "X86 doesn't allow scaling by ESP");
 496
 497     O << '(';
 498     if (HasBaseReg)
 499       printOperand(MI, Op, Modifier);
 500
 501     if (IndexReg.getReg()) {
 502       O << ',';
 503       printOperand(MI, Op+2, Modifier);
 504       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 505       if (ScaleVal != 1)
 506         O << ',' << ScaleVal;
 507     }
 508     O << ')';
 509   }
 510 }
 511
 512 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 513                                          const char *Modifier) {
 514   assert(isMem(MI, Op) && "Invalid memory reference!");
 515   const MachineOperand &Segment = MI->getOperand(Op+4);
 516   if (Segment.getReg()) {
 517     printOperand(MI, Op+4, Modifier);
 518     O << ':';
 519   }
 520   printLeaMemReference(MI, Op, Modifier);
 521 }
 522
 523 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
 524                                            const MachineBasicBlock *MBB) const {
 525   if (!TAI->getSetDirective())
 526     return;
 527
 528   // We don't need .set machinery if we have GOT-style relocations
 529   if (Subtarget->isPICStyleGOT())
 530     return;
 531
 532   O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
 533     << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
 534   printBasicBlockLabel(MBB, false, false, false);
 535   if (Subtarget->isPICStyleRIPRel())
 536     O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 537       << '_' << uid << '\n';
 538   else {
 539     O << '-';
 540     PrintPICBaseSymbol();
 541     O << '\n';
 542   }
 543 }
 544
 545
 546 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
 547   PrintPICBaseSymbol();
 548   O << '\n';
 549   PrintPICBaseSymbol();
 550   O << ':';
 551 }
 552
 553
 554 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
 555                                               const MachineBasicBlock *MBB,
 556                                               unsigned uid) const {
 557   const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
 558     TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
 559
 560   O << JTEntryDirective << ' ';
 561
 562   if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
 563     O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
 564       << '_' << uid << "_set_" << MBB->getNumber();
 565   } else if (Subtarget->isPICStyleGOT()) {
 566     printBasicBlockLabel(MBB, false, false, false);
 567     O << "@GOTOFF";
 568   } else
 569     printBasicBlockLabel(MBB, false, false, false);
 570 }
 571
 572 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
 573   unsigned Reg = MO.getReg();
 574   switch (Mode) {
 575   default: return true;  // Unknown mode.
 576   case 'b': // Print QImode register
 577     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 578     break;
 579   case 'h': // Print QImode high register
 580     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 581     break;
 582   case 'w': // Print HImode register
 583     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 584     break;
 585   case 'k': // Print SImode register
 586     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 587     break;
 588   case 'q': // Print DImode register
 589     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 590     break;
 591   }
 592
 593   O << '%'<< TRI->getAsmName(Reg);
 594   return false;
 595 }
 596
 597 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 598 ///
 599 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 600                                        unsigned AsmVariant,
 601                                        const char *ExtraCode) {
 602   // Does this asm operand have a single letter operand modifier?
 603   if (ExtraCode && ExtraCode[0]) {
 604     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 605
 606     const MachineOperand &MO = MI->getOperand(OpNo);
 607
 608     switch (ExtraCode[0]) {
 609     default: return true;  // Unknown modifier.
 610     case 'c': // Don't print "$" before a global var name or constant.
 611       if (MO.isImm())
 612         O << MO.getImm();
 613       else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
 614         printSymbolOperand(MO);
 615       else
 616         printOperand(MI, OpNo);
 617       return false;
 618
 619     case 'A': // Print '*' before a register (it must be a register)
 620       if (MO.isReg()) {
 621         O << '*';
 622         printOperand(MI, OpNo);
 623         return false;
 624       }
 625       return true;
 626
 627     case 'b': // Print QImode register
 628     case 'h': // Print QImode high register
 629     case 'w': // Print HImode register
 630     case 'k': // Print SImode register
 631     case 'q': // Print DImode register
 632       if (MO.isReg())
 633         return printAsmMRegister(MO, ExtraCode[0]);
 634       printOperand(MI, OpNo);
 635       return false;
 636
 637     case 'P': // This is the operand of a call, treat specially.
 638       print_pcrel_imm(MI, OpNo);
 639       return false;
 640
 641     case 'n':  // Negate the immediate or print a '-' before the operand.
 642       // Note: this is a temporary solution. It should be handled target
 643       // independently as part of the 'MC' work.
 644       if (MO.isImm()) {
 645         O << -MO.getImm();
 646         return false;
 647       }
 648       O << '-';
 649     }
 650   }
 651
 652   printOperand(MI, OpNo);
 653   return false;
 654 }
 655
 656 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 657                                              unsigned OpNo,
 658                                              unsigned AsmVariant,
 659                                              const char *ExtraCode) {
 660   if (ExtraCode && ExtraCode[0]) {
 661     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 662
 663     switch (ExtraCode[0]) {
 664     default: return true;  // Unknown modifier.
 665     case 'b': // Print QImode register
 666     case 'h': // Print QImode high register
 667     case 'w': // Print HImode register
 668     case 'k': // Print SImode register
 669     case 'q': // Print SImode register
 670       // These only apply to registers, ignore on mem.
 671       break;
 672     case 'P': // Don't print @PLT, but do print as memory.
 673       printMemReference(MI, OpNo, "no-rip");
 674       return false;
 675     }
 676   }
 677   printMemReference(MI, OpNo);
 678   return false;
 679 }
 680
 681 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
 682   // Convert registers in the addr mode according to subreg64.
 683   for (unsigned i = 0; i != 4; ++i) {
 684     if (!MI->getOperand(i).isReg()) continue;
 685
 686     unsigned Reg = MI->getOperand(i).getReg();
 687     if (Reg == 0) continue;
 688
 689     MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
 690   }
 691 }
 692
 693 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
 694 /// AT&T syntax to the current output stream.
 695 ///
 696 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 697   ++EmittedInsts;
 698
 699   if (NewAsmPrinter) {
 700     if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
 701       O << "\t";
 702       printInlineAsm(MI);
 703       return;
 704     } else if (MI->isLabel()) {
 705       printLabel(MI);
 706       return;
 707     } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
 708       printDeclare(MI);
 709       return;
 710     } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
 711       printImplicitDef(MI);
 712       return;
 713     }
 714
 715     O << "NEW: ";
 716     MCInst TmpInst;
 717
 718     TmpInst.setOpcode(MI->getOpcode());
 719
 720     for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
 721       const MachineOperand &MO = MI->getOperand(i);
 722
 723       MCOperand MCOp;
 724       if (MO.isReg()) {
 725         MCOp.MakeReg(MO.getReg());
 726       } else if (MO.isImm()) {
 727         MCOp.MakeImm(MO.getImm());
 728       } else if (MO.isMBB()) {
 729         MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
 730       } else {
 731         llvm_unreachable("Unimp");
 732       }
 733
 734       TmpInst.addOperand(MCOp);
 735     }
 736
 737     switch (TmpInst.getOpcode()) {
 738     case X86::LEA64_32r:
 739       // Handle the 'subreg rewriting' for the lea64_32mem operand.
 740       lower_lea64_32mem(&TmpInst, 1);
 741       break;
 742     }
 743
 744     // FIXME: Convert TmpInst.
 745     printInstruction(&TmpInst);
 746     O << "OLD: ";
 747   }
 748
 749   // Call the autogenerated instruction printer routines.
 750   printInstruction(MI);
 751 }
 752
 753 /// doInitialization
 754 bool X86ATTAsmPrinter::doInitialization(Module &M) {
 755   if (NewAsmPrinter) {
 756     Context = new MCContext();
 757     // FIXME: Send this to "O" instead of outs().  For now, we force it to
 758     // stdout to make it easy to compare.
 759     Streamer = createAsmStreamer(*Context, outs());
 760   }
 761
 762   return AsmPrinter::doInitialization(M);
 763 }
 764
 765 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
 766   const TargetData *TD = TM.getTargetData();
 767
 768   if (!GVar->hasInitializer())
 769     return;   // External global require no code
 770
 771   // Check to see if this is a special global used by LLVM, if so, emit it.
 772   if (EmitSpecialLLVMGlobal(GVar)) {
 773     if (Subtarget->isTargetDarwin() &&
 774         TM.getRelocationModel() == Reloc::Static) {
 775       if (GVar->getName() == "llvm.global_ctors")
 776         O << ".reference .constructors_used\n";
 777       else if (GVar->getName() == "llvm.global_dtors")
 778         O << ".reference .destructors_used\n";
 779     }
 780     return;
 781   }
 782
 783   std::string name = Mang->getMangledName(GVar);
 784   Constant *C = GVar->getInitializer();
 785   if (isa<MDNode>(C) || isa<MDString>(C))
 786     return;
 787   const Type *Type = C->getType();
 788   unsigned Size = TD->getTypeAllocSize(Type);
 789   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 790
 791   printVisibility(name, GVar->getVisibility());
 792
 793   if (Subtarget->isTargetELF())
 794     O << "\t.type\t" << name << ",@object\n";
 795
 796   SwitchToSection(TAI->SectionForGlobal(GVar));
 797
 798   if (C->isNullValue() && !GVar->hasSection() &&
 799       !(Subtarget->isTargetDarwin() &&
 800         TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
 801     // FIXME: This seems to be pretty darwin-specific
 802     if (GVar->hasExternalLinkage()) {
 803       if (const char *Directive = TAI->getZeroFillDirective()) {
 804         O << "\t.globl " << name << '\n';
 805         O << Directive << "__DATA, __common, " << name << ", "
 806           << Size << ", " << Align << '\n';
 807         return;
 808       }
 809     }
 810
 811     if (!GVar->isThreadLocal() &&
 812         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 813       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 814
 815       if (TAI->getLCOMMDirective() != NULL) {
 816         if (GVar->hasLocalLinkage()) {
 817           O << TAI->getLCOMMDirective() << name << ',' << Size;
 818           if (Subtarget->isTargetDarwin())
 819             O << ',' << Align;
 820         } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
 821           O << "\t.globl " << name << '\n'
 822             << TAI->getWeakDefDirective() << name << '\n';
 823           EmitAlignment(Align, GVar);
 824           O << name << ":";
 825           if (VerboseAsm) {
 826             O << "\t\t\t\t" << TAI->getCommentString() << ' ';
 827             PrintUnmangledNameSafely(GVar, O);
 828           }
 829           O << '\n';
 830           EmitGlobalConstant(C);
 831           return;
 832         } else {
 833           O << TAI->getCOMMDirective()  << name << ',' << Size;
 834           if (TAI->getCOMMDirectiveTakesAlignment())
 835             O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 836         }
 837       } else {
 838         if (!Subtarget->isTargetCygMing()) {
 839           if (GVar->hasLocalLinkage())
 840             O << "\t.local\t" << name << '\n';
 841         }
 842         O << TAI->getCOMMDirective()  << name << ',' << Size;
 843         if (TAI->getCOMMDirectiveTakesAlignment())
 844           O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 845       }
 846       if (VerboseAsm) {
 847         O << "\t\t" << TAI->getCommentString() << ' ';
 848         PrintUnmangledNameSafely(GVar, O);
 849       }
 850       O << '\n';
 851       return;
 852     }
 853   }
 854
 855   switch (GVar->getLinkage()) {
 856   case GlobalValue::CommonLinkage:
 857   case GlobalValue::LinkOnceAnyLinkage:
 858   case GlobalValue::LinkOnceODRLinkage:
 859   case GlobalValue::WeakAnyLinkage:
 860   case GlobalValue::WeakODRLinkage:
 861     if (Subtarget->isTargetDarwin()) {
 862       O << "\t.globl " << name << '\n'
 863         << TAI->getWeakDefDirective() << name << '\n';
 864     } else if (Subtarget->isTargetCygMing()) {
 865       O << "\t.globl\t" << name << "\n"
 866            "\t.linkonce same_size\n";
 867     } else {
 868       O << "\t.weak\t" << name << '\n';
 869     }
 870     break;
 871   case GlobalValue::DLLExportLinkage:
 872   case GlobalValue::AppendingLinkage:
 873     // FIXME: appending linkage variables should go into a section of
 874     // their name or something.  For now, just emit them as external.
 875   case GlobalValue::ExternalLinkage:
 876     // If external or appending, declare as a global symbol
 877     O << "\t.globl " << name << '\n';
 878     // FALL THROUGH
 879   case GlobalValue::PrivateLinkage:
 880   case GlobalValue::InternalLinkage:
 881      break;
 882   default:
 883     llvm_unreachable("Unknown linkage type!");
 884   }
 885
 886   EmitAlignment(Align, GVar);
 887   O << name << ":";
 888   if (VerboseAsm){
 889     O << "\t\t\t\t" << TAI->getCommentString() << ' ';
 890     PrintUnmangledNameSafely(GVar, O);
 891   }
 892   O << '\n';
 893   if (TAI->hasDotTypeDotSizeDirective())
 894     O << "\t.size\t" << name << ", " << Size << '\n';
 895
 896   EmitGlobalConstant(C);
 897 }
 898
 899 bool X86ATTAsmPrinter::doFinalization(Module &M) {
 900   // Print out module-level global variables here.
 901   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 902        I != E; ++I) {
 903     printModuleLevelGV(I);
 904
 905     if (I->hasDLLExportLinkage())
 906       DLLExportedGVs.insert(Mang->getMangledName(I));
 907   }
 908
 909   if (Subtarget->isTargetDarwin()) {
 910     SwitchToDataSection("");
 911
 912     // Add the (possibly multiple) personalities to the set of global value
 913     // stubs.  Only referenced functions get into the Personalities list.
 914     if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
 915       const std::vector<Function*> &Personalities = MMI->getPersonalities();
 916       for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
 917         if (Personalities[i])
 918           GVStubs[Mang->getMangledName(Personalities[i], "$non_lazy_ptr",
 919                                        true /*private label*/)] =
 920             Mang->getMangledName(Personalities[i]);
 921       }
 922     }
 923
 924     // Output stubs for dynamically-linked functions
 925     if (!FnStubs.empty()) {
 926       SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
 927                           "self_modifying_code+pure_instructions,5", 0);
 928       for (StringMap<std::string>::iterator I = FnStubs.begin(),
 929            E = FnStubs.end(); I != E; ++I)
 930         O << I->getKeyData() << ":\n" << "\t.indirect_symbol " << I->second
 931           << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
 932       O << '\n';
 933     }
 934
 935     // Output stubs for external and common global variables.
 936     if (!GVStubs.empty()) {
 937       SwitchToDataSection(
 938                     "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
 939       for (StringMap<std::string>::iterator I = GVStubs.begin(),
 940            E = GVStubs.end(); I != E; ++I)
 941         O << I->getKeyData() << ":\n\t.indirect_symbol "
 942           << I->second << "\n\t.long\t0\n";
 943     }
 944
 945     if (!HiddenGVStubs.empty()) {
 946       SwitchToSection(TAI->getDataSection());
 947       EmitAlignment(2);
 948       for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
 949            E = HiddenGVStubs.end(); I != E; ++I)
 950         O << I->getKeyData() << ":\n" << TAI->getData32bitsDirective()
 951           << I->second << '\n';
 952     }
 953
 954     // Funny Darwin hack: This flag tells the linker that no global symbols
 955     // contain code that falls through to other global symbols (e.g. the obvious
 956     // implementation of multiple entry points).  If this doesn't occur, the
 957     // linker can safely perform dead code stripping.  Since LLVM never
 958     // generates code that does this, it is always safe to set.
 959     O << "\t.subsections_via_symbols\n";
 960   } else if (Subtarget->isTargetCygMing()) {
 961     // Emit type information for external functions
 962     for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
 963          i != e; ++i) {
 964       O << "\t.def\t " << i->getKeyData()
 965         << ";\t.scl\t" << COFF::C_EXT
 966         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 967         << ";\t.endef\n";
 968     }
 969   }
 970
 971
 972   // Output linker support code for dllexported globals on windows.
 973   if (!DLLExportedGVs.empty()) {
 974     SwitchToDataSection(".section .drectve");
 975
 976     for (StringSet<>::iterator i = DLLExportedGVs.begin(),
 977          e = DLLExportedGVs.end(); i != e; ++i)
 978       O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
 979   }
 980
 981   if (!DLLExportedFns.empty()) {
 982     SwitchToDataSection(".section .drectve");
 983
 984     for (StringSet<>::iterator i = DLLExportedFns.begin(),
 985          e = DLLExportedFns.end();
 986          i != e; ++i)
 987       O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
 988   }
 989
 990   // Do common shutdown.
 991   bool Changed = AsmPrinter::doFinalization(M);
 992
 993   if (NewAsmPrinter) {
 994     Streamer->Finish();
 995
 996     delete Streamer;
 997     delete Context;
 998     Streamer = 0;
 999     Context = 0;
1000   }
1001
1002   return Changed;
1003 }
1004
1005 // Include the auto-generated portion of the assembly writer.
1006 #include "X86GenAsmWriter.inc"