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 "X86ATTInstPrinter.h"
  19 #include "X86MCInstLower.h"
  20 #include "X86.h"
  21 #include "X86COFF.h"
  22 #include "X86MachineFunctionInfo.h"
  23 #include "X86TargetMachine.h"
  24 #include "llvm/CallingConv.h"
  25 #include "llvm/DerivedTypes.h"
  26 #include "llvm/Module.h"
  27 #include "llvm/Type.h"
  28 #include "llvm/Assembly/Writer.h"
  29 #include "llvm/MC/MCContext.h"
  30 #include "llvm/MC/MCSectionMachO.h"
  31 #include "llvm/MC/MCStreamer.h"
  32 #include "llvm/MC/MCSymbol.h"
  33 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  34 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
  35 #include "llvm/Support/ErrorHandling.h"
  36 #include "llvm/Support/FormattedStream.h"
  37 #include "llvm/Support/Mangler.h"
  38 #include "llvm/MC/MCAsmInfo.h"
  39 #include "llvm/Target/TargetLoweringObjectFile.h"
  40 #include "llvm/Target/TargetOptions.h"
  41 #include "llvm/ADT/SmallString.h"
  42 #include "llvm/ADT/Statistic.h"
  43 using namespace llvm;
  44
  45 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  46
  47 //===----------------------------------------------------------------------===//
  48 // Primitive Helper Functions.
  49 //===----------------------------------------------------------------------===//
  50
  51 void X86ATTAsmPrinter::printMCInst(const MCInst *MI) {
  52   X86ATTInstPrinter(O, *MAI).printInstruction(MI);
  53 }
  54
  55 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
  56   // FIXME: Gross const cast hack.
  57   X86ATTAsmPrinter *AP = const_cast<X86ATTAsmPrinter*>(this);
  58   X86MCInstLower(OutContext, 0, *AP).GetPICBaseSymbol()->print(O, MAI);
  59 }
  60
  61 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
  62                                                     const TargetData *TD) {
  63   X86MachineFunctionInfo Info;
  64   uint64_t Size = 0;
  65
  66   switch (F->getCallingConv()) {
  67   case CallingConv::X86_StdCall:
  68     Info.setDecorationStyle(StdCall);
  69     break;
  70   case CallingConv::X86_FastCall:
  71     Info.setDecorationStyle(FastCall);
  72     break;
  73   default:
  74     return Info;
  75   }
  76
  77   unsigned argNum = 1;
  78   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
  79        AI != AE; ++AI, ++argNum) {
  80     const Type* Ty = AI->getType();
  81
  82     // 'Dereference' type in case of byval parameter attribute
  83     if (F->paramHasAttr(argNum, Attribute::ByVal))
  84       Ty = cast<PointerType>(Ty)->getElementType();
  85
  86     // Size should be aligned to DWORD boundary
  87     Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
  88   }
  89
  90   // We're not supporting tooooo huge arguments :)
  91   Info.setBytesToPopOnReturn((unsigned int)Size);
  92   return Info;
  93 }
  94
  95 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
  96 /// various name decorations for Cygwin and MingW.
  97 void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
  98                                            const GlobalValue *GV) {
  99   assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
 100
 101   const Function *F = dyn_cast<Function>(GV);
 102   if (!F) return;
 103
 104   // Save function name for later type emission.
 105   if (F->isDeclaration())
 106     CygMingStubs.insert(StringRef(Name.data(), Name.size()));
 107
 108   // We don't want to decorate non-stdcall or non-fastcall functions right now
 109   CallingConv::ID CC = F->getCallingConv();
 110   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
 111     return;
 112
 113
 114   const X86MachineFunctionInfo *Info;
 115
 116   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
 117   if (info_item == FunctionInfoMap.end()) {
 118     // Calculate apropriate function info and populate map
 119     FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
 120     Info = &FunctionInfoMap[F];
 121   } else {
 122     Info = &info_item->second;
 123   }
 124
 125   if (Info->getDecorationStyle() == None) return;
 126   const FunctionType *FT = F->getFunctionType();
 127
 128   // "Pure" variadic functions do not receive @0 suffix.
 129   if (!FT->isVarArg() || FT->getNumParams() == 0 ||
 130       (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 131     raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
 132
 133   if (Info->getDecorationStyle() == FastCall) {
 134     if (Name[0] == '_')
 135       Name[0] = '@';
 136     else
 137       Name.insert(Name.begin(), '@');
 138   }
 139 }
 140
 141 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
 142 /// various name decorations for Cygwin and MingW.
 143 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
 144                                            const GlobalValue *GV) {
 145   SmallString<128> NameStr(Name.begin(), Name.end());
 146   DecorateCygMingName(NameStr, GV);
 147   Name.assign(NameStr.begin(), NameStr.end());
 148 }
 149
 150 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 151   unsigned FnAlign = MF.getAlignment();
 152   const Function *F = MF.getFunction();
 153
 154   if (Subtarget->isTargetCygMing())
 155     DecorateCygMingName(CurrentFnName, F);
 156
 157   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
 158   EmitAlignment(FnAlign, F);
 159
 160   switch (F->getLinkage()) {
 161   default: llvm_unreachable("Unknown linkage type!");
 162   case Function::InternalLinkage:  // Symbols default to internal.
 163   case Function::PrivateLinkage:
 164     break;
 165   case Function::DLLExportLinkage:
 166   case Function::ExternalLinkage:
 167     O << "\t.globl\t" << CurrentFnName << '\n';
 168     break;
 169   case Function::LinkerPrivateLinkage:
 170   case Function::LinkOnceAnyLinkage:
 171   case Function::LinkOnceODRLinkage:
 172   case Function::WeakAnyLinkage:
 173   case Function::WeakODRLinkage:
 174     if (Subtarget->isTargetDarwin()) {
 175       O << "\t.globl\t" << CurrentFnName << '\n';
 176       O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
 177     } else if (Subtarget->isTargetCygMing()) {
 178       O << "\t.globl\t" << CurrentFnName << "\n"
 179            "\t.linkonce discard\n";
 180     } else {
 181       O << "\t.weak\t" << CurrentFnName << '\n';
 182     }
 183     break;
 184   }
 185
 186   printVisibility(CurrentFnName, F->getVisibility());
 187
 188   if (Subtarget->isTargetELF())
 189     O << "\t.type\t" << CurrentFnName << ",@function\n";
 190   else if (Subtarget->isTargetCygMing()) {
 191     O << "\t.def\t " << CurrentFnName
 192       << ";\t.scl\t" <<
 193       (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
 194       << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 195       << ";\t.endef\n";
 196   }
 197
 198   O << CurrentFnName << ':';
 199   if (VerboseAsm) {
 200     O.PadToColumn(MAI->getCommentColumn());
 201     O << MAI->getCommentString() << ' ';
 202     WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
 203   }
 204   O << '\n';
 205
 206   // Add some workaround for linkonce linkage on Cygwin\MinGW
 207   if (Subtarget->isTargetCygMing() &&
 208       (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
 209     O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
 210 }
 211
 212 /// runOnMachineFunction - This uses the printMachineInstruction()
 213 /// method to print assembly for each instruction.
 214 ///
 215 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 216   const Function *F = MF.getFunction();
 217   this->MF = &MF;
 218   CallingConv::ID CC = F->getCallingConv();
 219
 220   SetupMachineFunction(MF);
 221   O << "\n\n";
 222
 223   // Populate function information map.  Actually, We don't want to populate
 224   // non-stdcall or non-fastcall functions' information right now.
 225   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
 226     FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
 227
 228   // Print out constants referenced by the function
 229   EmitConstantPool(MF.getConstantPool());
 230
 231   if (F->hasDLLExportLinkage())
 232     DLLExportedFns.insert(Mang->getMangledName(F));
 233
 234   // Print the 'header' of function
 235   emitFunctionHeader(MF);
 236
 237   // Emit pre-function debug and/or EH information.
 238   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 239     DW->BeginFunction(&MF);
 240
 241   // Print out code for the function.
 242   bool hasAnyRealCode = false;
 243   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 244        I != E; ++I) {
 245     // Print a label for the basic block.
 246     if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
 247       // This is an entry block or a block that's only reachable via a
 248       // fallthrough edge. In non-VerboseAsm mode, don't print the label.
 249     } else {
 250       EmitBasicBlockStart(I);
 251       O << '\n';
 252     }
 253     for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
 254          II != IE; ++II) {
 255       // Print the assembly for the instruction.
 256       if (!II->isLabel())
 257         hasAnyRealCode = true;
 258       printMachineInstruction(II);
 259     }
 260   }
 261
 262   if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
 263     // If the function is empty, then we need to emit *something*. Otherwise,
 264     // the function's label might be associated with something that it wasn't
 265     // meant to be associated with. We emit a noop in this situation.
 266     // We are assuming inline asms are code.
 267     O << "\tnop\n";
 268   }
 269
 270   if (MAI->hasDotTypeDotSizeDirective())
 271     O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
 272
 273   // Emit post-function debug information.
 274   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 275     DW->EndFunction(&MF);
 276
 277   // Print out jump tables referenced by the function.
 278   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 279
 280   // We didn't modify anything.
 281   return false;
 282 }
 283
 284 /// printSymbolOperand - Print a raw symbol reference operand.  This handles
 285 /// jump tables, constant pools, global address and external symbols, all of
 286 /// which print to a label with various suffixes for relocation types etc.
 287 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
 288   switch (MO.getType()) {
 289   default: llvm_unreachable("unknown symbol type!");
 290   case MachineOperand::MO_JumpTableIndex:
 291     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 292       << MO.getIndex();
 293     break;
 294   case MachineOperand::MO_ConstantPoolIndex:
 295     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 296       << MO.getIndex();
 297     printOffset(MO.getOffset());
 298     break;
 299   case MachineOperand::MO_GlobalAddress: {
 300     const GlobalValue *GV = MO.getGlobal();
 301
 302     const char *Suffix = "";
 303     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 304       Suffix = "$stub";
 305     else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 306              MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
 307              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 308       Suffix = "$non_lazy_ptr";
 309
 310     std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
 311     if (Subtarget->isTargetCygMing())
 312       DecorateCygMingName(Name, GV);
 313
 314     // Handle dllimport linkage.
 315     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
 316       Name = "__imp_" + Name;
 317
 318     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 319         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
 320       SmallString<128> NameStr;
 321       Mang->getNameWithPrefix(NameStr, GV, true);
 322       NameStr += "$non_lazy_ptr";
 323       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 324
 325       const MCSymbol *&StubSym =
 326         MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
 327       if (StubSym == 0) {
 328         NameStr.clear();
 329         Mang->getNameWithPrefix(NameStr, GV, false);
 330         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 331       }
 332     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
 333       SmallString<128> NameStr;
 334       Mang->getNameWithPrefix(NameStr, GV, true);
 335       NameStr += "$non_lazy_ptr";
 336       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 337       const MCSymbol *&StubSym =
 338         MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
 339       if (StubSym == 0) {
 340         NameStr.clear();
 341         Mang->getNameWithPrefix(NameStr, GV, false);
 342         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 343       }
 344     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 345       SmallString<128> NameStr;
 346       Mang->getNameWithPrefix(NameStr, GV, true);
 347       NameStr += "$stub";
 348       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 349       const MCSymbol *&StubSym =
 350         MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
 351       if (StubSym == 0) {
 352         NameStr.clear();
 353         Mang->getNameWithPrefix(NameStr, GV, false);
 354         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 355       }
 356     }
 357
 358     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 359     // to avoid having it look like an integer immediate to the assembler.
 360     if (Name[0] == '$')
 361       O << '(' << Name << ')';
 362     else
 363       O << Name;
 364
 365     printOffset(MO.getOffset());
 366     break;
 367   }
 368   case MachineOperand::MO_ExternalSymbol: {
 369     std::string Name = Mang->makeNameProper(MO.getSymbolName());
 370     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 371       Name += "$stub";
 372       MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
 373       const MCSymbol *&StubSym =
 374         MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
 375       if (StubSym == 0) {
 376         Name.erase(Name.end()-5, Name.end());
 377         StubSym = OutContext.GetOrCreateSymbol(Name);
 378       }
 379     }
 380
 381     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 382     // to avoid having it look like an integer immediate to the assembler.
 383     if (Name[0] == '$')
 384       O << '(' << Name << ')';
 385     else
 386       O << Name;
 387     break;
 388   }
 389   }
 390
 391   switch (MO.getTargetFlags()) {
 392   default:
 393     llvm_unreachable("Unknown target flag on GV operand");
 394   case X86II::MO_NO_FLAG:    // No flag.
 395     break;
 396   case X86II::MO_DARWIN_NONLAZY:
 397   case X86II::MO_DLLIMPORT:
 398   case X86II::MO_DARWIN_STUB:
 399     // These affect the name of the symbol, not any suffix.
 400     break;
 401   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
 402     O << " + [.-";
 403     PrintPICBaseSymbol();
 404     O << ']';
 405     break;
 406   case X86II::MO_PIC_BASE_OFFSET:
 407   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
 408   case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
 409     O << '-';
 410     PrintPICBaseSymbol();
 411     break;
 412   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
 413   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
 414   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
 415   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
 416   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
 417   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
 418   case X86II::MO_GOT:       O << "@GOT";       break;
 419   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
 420   case X86II::MO_PLT:       O << "@PLT";       break;
 421   }
 422 }
 423
 424 /// print_pcrel_imm - This is used to print an immediate value that ends up
 425 /// being encoded as a pc-relative value.  These print slightly differently, for
 426 /// example, a $ is not emitted.
 427 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
 428   const MachineOperand &MO = MI->getOperand(OpNo);
 429   switch (MO.getType()) {
 430   default: llvm_unreachable("Unknown pcrel immediate operand");
 431   case MachineOperand::MO_Immediate:
 432     O << MO.getImm();
 433     return;
 434   case MachineOperand::MO_MachineBasicBlock:
 435     GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
 436     return;
 437   case MachineOperand::MO_GlobalAddress:
 438   case MachineOperand::MO_ExternalSymbol:
 439     printSymbolOperand(MO);
 440     return;
 441   }
 442 }
 443
 444
 445 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 446                                     const char *Modifier) {
 447   const MachineOperand &MO = MI->getOperand(OpNo);
 448   switch (MO.getType()) {
 449   default: llvm_unreachable("unknown operand type!");
 450   case MachineOperand::MO_Register: {
 451     O << '%';
 452     unsigned Reg = MO.getReg();
 453     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 454       EVT VT = (strcmp(Modifier+6,"64") == 0) ?
 455         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 456                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 457       Reg = getX86SubSuperRegister(Reg, VT);
 458     }
 459     O << X86ATTInstPrinter::getRegisterName(Reg);
 460     return;
 461   }
 462
 463   case MachineOperand::MO_Immediate:
 464     O << '$' << MO.getImm();
 465     return;
 466
 467   case MachineOperand::MO_JumpTableIndex:
 468   case MachineOperand::MO_ConstantPoolIndex:
 469   case MachineOperand::MO_GlobalAddress:
 470   case MachineOperand::MO_ExternalSymbol: {
 471     O << '$';
 472     printSymbolOperand(MO);
 473     break;
 474   }
 475   }
 476 }
 477
 478 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
 479   unsigned char value = MI->getOperand(Op).getImm();
 480   assert(value <= 7 && "Invalid ssecc argument!");
 481   switch (value) {
 482   case 0: O << "eq"; break;
 483   case 1: O << "lt"; break;
 484   case 2: O << "le"; break;
 485   case 3: O << "unord"; break;
 486   case 4: O << "neq"; break;
 487   case 5: O << "nlt"; break;
 488   case 6: O << "nle"; break;
 489   case 7: O << "ord"; break;
 490   }
 491 }
 492
 493 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
 494                                             const char *Modifier) {
 495   const MachineOperand &BaseReg  = MI->getOperand(Op);
 496   const MachineOperand &IndexReg = MI->getOperand(Op+2);
 497   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 498
 499   // If we really don't want to print out (rip), don't.
 500   bool HasBaseReg = BaseReg.getReg() != 0;
 501   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
 502       BaseReg.getReg() == X86::RIP)
 503     HasBaseReg = false;
 504
 505   // HasParenPart - True if we will print out the () part of the mem ref.
 506   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
 507
 508   if (DispSpec.isImm()) {
 509     int DispVal = DispSpec.getImm();
 510     if (DispVal || !HasParenPart)
 511       O << DispVal;
 512   } else {
 513     assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 514            DispSpec.isJTI() || DispSpec.isSymbol());
 515     printSymbolOperand(MI->getOperand(Op+3));
 516   }
 517
 518   if (HasParenPart) {
 519     assert(IndexReg.getReg() != X86::ESP &&
 520            "X86 doesn't allow scaling by ESP");
 521
 522     O << '(';
 523     if (HasBaseReg)
 524       printOperand(MI, Op, Modifier);
 525
 526     if (IndexReg.getReg()) {
 527       O << ',';
 528       printOperand(MI, Op+2, Modifier);
 529       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 530       if (ScaleVal != 1)
 531         O << ',' << ScaleVal;
 532     }
 533     O << ')';
 534   }
 535 }
 536
 537 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 538                                          const char *Modifier) {
 539   assert(isMem(MI, Op) && "Invalid memory reference!");
 540   const MachineOperand &Segment = MI->getOperand(Op+4);
 541   if (Segment.getReg()) {
 542     printOperand(MI, Op+4, Modifier);
 543     O << ':';
 544   }
 545   printLeaMemReference(MI, Op, Modifier);
 546 }
 547
 548 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
 549                                            const MachineBasicBlock *MBB) const {
 550   if (!MAI->getSetDirective())
 551     return;
 552
 553   // We don't need .set machinery if we have GOT-style relocations
 554   if (Subtarget->isPICStyleGOT())
 555     return;
 556
 557   O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
 558     << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
 559
 560   GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 561
 562   if (Subtarget->isPICStyleRIPRel())
 563     O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 564       << '_' << uid << '\n';
 565   else {
 566     O << '-';
 567     PrintPICBaseSymbol();
 568     O << '\n';
 569   }
 570 }
 571
 572
 573 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
 574   PrintPICBaseSymbol();
 575   O << '\n';
 576   PrintPICBaseSymbol();
 577   O << ':';
 578 }
 579
 580 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
 581                                               const MachineBasicBlock *MBB,
 582                                               unsigned uid) const {
 583   const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
 584     MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
 585
 586   O << JTEntryDirective << ' ';
 587
 588   if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
 589     O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
 590       << '_' << uid << "_set_" << MBB->getNumber();
 591   } else if (Subtarget->isPICStyleGOT()) {
 592     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 593     O << "@GOTOFF";
 594   } else
 595     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 596 }
 597
 598 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
 599   unsigned Reg = MO.getReg();
 600   switch (Mode) {
 601   default: return true;  // Unknown mode.
 602   case 'b': // Print QImode register
 603     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 604     break;
 605   case 'h': // Print QImode high register
 606     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 607     break;
 608   case 'w': // Print HImode register
 609     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 610     break;
 611   case 'k': // Print SImode register
 612     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 613     break;
 614   case 'q': // Print DImode register
 615     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 616     break;
 617   }
 618
 619   O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
 620   return false;
 621 }
 622
 623 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 624 ///
 625 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 626                                        unsigned AsmVariant,
 627                                        const char *ExtraCode) {
 628   // Does this asm operand have a single letter operand modifier?
 629   if (ExtraCode && ExtraCode[0]) {
 630     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 631
 632     const MachineOperand &MO = MI->getOperand(OpNo);
 633
 634     switch (ExtraCode[0]) {
 635     default: return true;  // Unknown modifier.
 636     case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
 637       if (MO.isImm()) {
 638         O << MO.getImm();
 639         return false;
 640       }
 641       if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
 642         printSymbolOperand(MO);
 643         return false;
 644       }
 645       if (MO.isReg()) {
 646         O << '(';
 647         printOperand(MI, OpNo);
 648         O << ')';
 649         return false;
 650       }
 651       return true;
 652
 653     case 'c': // Don't print "$" before a global var name or constant.
 654       if (MO.isImm())
 655         O << MO.getImm();
 656       else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
 657         printSymbolOperand(MO);
 658       else
 659         printOperand(MI, OpNo);
 660       return false;
 661
 662     case 'A': // Print '*' before a register (it must be a register)
 663       if (MO.isReg()) {
 664         O << '*';
 665         printOperand(MI, OpNo);
 666         return false;
 667       }
 668       return true;
 669
 670     case 'b': // Print QImode register
 671     case 'h': // Print QImode high register
 672     case 'w': // Print HImode register
 673     case 'k': // Print SImode register
 674     case 'q': // Print DImode register
 675       if (MO.isReg())
 676         return printAsmMRegister(MO, ExtraCode[0]);
 677       printOperand(MI, OpNo);
 678       return false;
 679
 680     case 'P': // This is the operand of a call, treat specially.
 681       print_pcrel_imm(MI, OpNo);
 682       return false;
 683
 684     case 'n':  // Negate the immediate or print a '-' before the operand.
 685       // Note: this is a temporary solution. It should be handled target
 686       // independently as part of the 'MC' work.
 687       if (MO.isImm()) {
 688         O << -MO.getImm();
 689         return false;
 690       }
 691       O << '-';
 692     }
 693   }
 694
 695   printOperand(MI, OpNo);
 696   return false;
 697 }
 698
 699 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 700                                              unsigned OpNo,
 701                                              unsigned AsmVariant,
 702                                              const char *ExtraCode) {
 703   if (ExtraCode && ExtraCode[0]) {
 704     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 705
 706     switch (ExtraCode[0]) {
 707     default: return true;  // Unknown modifier.
 708     case 'b': // Print QImode register
 709     case 'h': // Print QImode high register
 710     case 'w': // Print HImode register
 711     case 'k': // Print SImode register
 712     case 'q': // Print SImode register
 713       // These only apply to registers, ignore on mem.
 714       break;
 715     case 'P': // Don't print @PLT, but do print as memory.
 716       printMemReference(MI, OpNo, "no-rip");
 717       return false;
 718     }
 719   }
 720   printMemReference(MI, OpNo);
 721   return false;
 722 }
 723
 724
 725
 726 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
 727 /// AT&T syntax to the current output stream.
 728 ///
 729 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 730   ++EmittedInsts;
 731
 732   processDebugLoc(MI->getDebugLoc());
 733
 734   printInstructionThroughMCStreamer(MI);
 735
 736   if (VerboseAsm && !MI->getDebugLoc().isUnknown())
 737     EmitComments(*MI);
 738   O << '\n';
 739 }
 740
 741 void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
 742   if (!GVar->hasInitializer())
 743     return;   // External global require no code
 744
 745   // Check to see if this is a special global used by LLVM, if so, emit it.
 746   if (EmitSpecialLLVMGlobal(GVar)) {
 747     if (Subtarget->isTargetDarwin() &&
 748         TM.getRelocationModel() == Reloc::Static) {
 749       if (GVar->getName() == "llvm.global_ctors")
 750         O << ".reference .constructors_used\n";
 751       else if (GVar->getName() == "llvm.global_dtors")
 752         O << ".reference .destructors_used\n";
 753     }
 754     return;
 755   }
 756
 757   const TargetData *TD = TM.getTargetData();
 758
 759   std::string name = Mang->getMangledName(GVar);
 760   Constant *C = GVar->getInitializer();
 761   const Type *Type = C->getType();
 762   unsigned Size = TD->getTypeAllocSize(Type);
 763   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 764
 765   printVisibility(name, GVar->getVisibility());
 766
 767   if (Subtarget->isTargetELF())
 768     O << "\t.type\t" << name << ",@object\n";
 769
 770
 771   SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
 772   const MCSection *TheSection =
 773     getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
 774   OutStreamer.SwitchSection(TheSection);
 775
 776   // FIXME: get this stuff from section kind flags.
 777   if (C->isNullValue() && !GVar->hasSection() &&
 778       // Don't put things that should go in the cstring section into "comm".
 779       !TheSection->getKind().isMergeableCString()) {
 780     if (GVar->hasExternalLinkage()) {
 781       if (const char *Directive = MAI->getZeroFillDirective()) {
 782         O << "\t.globl " << name << '\n';
 783         O << Directive << "__DATA, __common, " << name << ", "
 784           << Size << ", " << Align << '\n';
 785         return;
 786       }
 787     }
 788
 789     if (!GVar->isThreadLocal() &&
 790         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 791       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 792
 793       if (MAI->getLCOMMDirective() != NULL) {
 794         if (GVar->hasLocalLinkage()) {
 795           O << MAI->getLCOMMDirective() << name << ',' << Size;
 796           if (Subtarget->isTargetDarwin())
 797             O << ',' << Align;
 798         } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
 799           O << "\t.globl " << name << '\n'
 800             << MAI->getWeakDefDirective() << name << '\n';
 801           EmitAlignment(Align, GVar);
 802           O << name << ":";
 803           if (VerboseAsm) {
 804             O.PadToColumn(MAI->getCommentColumn());
 805             O << MAI->getCommentString() << ' ';
 806             WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 807           }
 808           O << '\n';
 809           EmitGlobalConstant(C);
 810           return;
 811         } else {
 812           O << MAI->getCOMMDirective()  << name << ',' << Size;
 813           if (MAI->getCOMMDirectiveTakesAlignment())
 814             O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 815         }
 816       } else {
 817         if (!Subtarget->isTargetCygMing()) {
 818           if (GVar->hasLocalLinkage())
 819             O << "\t.local\t" << name << '\n';
 820         }
 821         O << MAI->getCOMMDirective()  << name << ',' << Size;
 822         if (MAI->getCOMMDirectiveTakesAlignment())
 823           O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 824       }
 825       if (VerboseAsm) {
 826         O.PadToColumn(MAI->getCommentColumn());
 827         O << MAI->getCommentString() << ' ';
 828         WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 829       }
 830       O << '\n';
 831       return;
 832     }
 833   }
 834
 835   switch (GVar->getLinkage()) {
 836   case GlobalValue::CommonLinkage:
 837   case GlobalValue::LinkOnceAnyLinkage:
 838   case GlobalValue::LinkOnceODRLinkage:
 839   case GlobalValue::WeakAnyLinkage:
 840   case GlobalValue::WeakODRLinkage:
 841   case GlobalValue::LinkerPrivateLinkage:
 842     if (Subtarget->isTargetDarwin()) {
 843       O << "\t.globl " << name << '\n'
 844         << MAI->getWeakDefDirective() << name << '\n';
 845     } else if (Subtarget->isTargetCygMing()) {
 846       O << "\t.globl\t" << name << "\n"
 847            "\t.linkonce same_size\n";
 848     } else {
 849       O << "\t.weak\t" << name << '\n';
 850     }
 851     break;
 852   case GlobalValue::DLLExportLinkage:
 853   case GlobalValue::AppendingLinkage:
 854     // FIXME: appending linkage variables should go into a section of
 855     // their name or something.  For now, just emit them as external.
 856   case GlobalValue::ExternalLinkage:
 857     // If external or appending, declare as a global symbol
 858     O << "\t.globl " << name << '\n';
 859     // FALL THROUGH
 860   case GlobalValue::PrivateLinkage:
 861   case GlobalValue::InternalLinkage:
 862      break;
 863   default:
 864     llvm_unreachable("Unknown linkage type!");
 865   }
 866
 867   EmitAlignment(Align, GVar);
 868   O << name << ":";
 869   if (VerboseAsm){
 870     O.PadToColumn(MAI->getCommentColumn());
 871     O << MAI->getCommentString() << ' ';
 872     WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 873   }
 874   O << '\n';
 875
 876   EmitGlobalConstant(C);
 877
 878   if (MAI->hasDotTypeDotSizeDirective())
 879     O << "\t.size\t" << name << ", " << Size << '\n';
 880 }
 881
 882 bool X86ATTAsmPrinter::doFinalization(Module &M) {
 883   if (Subtarget->isTargetDarwin()) {
 884     // All darwin targets use mach-o.
 885     TargetLoweringObjectFileMachO &TLOFMacho =
 886       static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
 887
 888     MachineModuleInfoMachO &MMIMacho =
 889       MMI->getObjFileInfo<MachineModuleInfoMachO>();
 890
 891     // Add the (possibly multiple) personalities to the set of global value
 892     // stubs.  Only referenced functions get into the Personalities list.
 893     if (!Subtarget->is64Bit()) {
 894       const std::vector<Function*> &Personalities = MMI->getPersonalities();
 895       for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
 896         if (Personalities[i] == 0)
 897           continue;
 898
 899         SmallString<128> Name;
 900         Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
 901         Name += "$non_lazy_ptr";
 902         MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
 903
 904         const MCSymbol *&StubName = MMIMacho.getGVStubEntry(NLPName);
 905         Name.clear();
 906         Mang->getNameWithPrefix(Name, Personalities[i], false);
 907         StubName = OutContext.GetOrCreateSymbol(Name.str());
 908       }
 909     }
 910
 911     // Output stubs for dynamically-linked functions.
 912     MachineModuleInfoMachO::SymbolListTy Stubs;
 913
 914     Stubs = MMIMacho.GetFnStubList();
 915     if (!Stubs.empty()) {
 916       const MCSection *TheSection =
 917         TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
 918                                   MCSectionMachO::S_SYMBOL_STUBS |
 919                                   MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
 920                                   MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 921                                   5, SectionKind::getMetadata());
 922       OutStreamer.SwitchSection(TheSection);
 923
 924       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 925         Stubs[i].first->print(O, MAI);
 926         O << ":\n" << "\t.indirect_symbol ";
 927         // Get the MCSymbol without the $stub suffix.
 928         Stubs[i].second->print(O, MAI);
 929         O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
 930       }
 931       O << '\n';
 932
 933       Stubs.clear();
 934     }
 935
 936     // Output stubs for external and common global variables.
 937     Stubs = MMIMacho.GetGVStubList();
 938     if (!Stubs.empty()) {
 939       const MCSection *TheSection =
 940         TLOFMacho.getMachOSection("__IMPORT", "__pointers",
 941                                   MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 942                                   SectionKind::getMetadata());
 943       OutStreamer.SwitchSection(TheSection);
 944
 945       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 946         Stubs[i].first->print(O, MAI);
 947         O << ":\n\t.indirect_symbol ";
 948         Stubs[i].second->print(O, MAI);
 949         O << "\n\t.long\t0\n";
 950       }
 951       Stubs.clear();
 952     }
 953
 954     Stubs = MMIMacho.GetHiddenGVStubList();
 955     if (!Stubs.empty()) {
 956       OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
 957       EmitAlignment(2);
 958
 959       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 960         Stubs[i].first->print(O, MAI);
 961         O << ":\n" << MAI->getData32bitsDirective();
 962         Stubs[i].second->print(O, MAI);
 963         O << '\n';
 964       }
 965       Stubs.clear();
 966     }
 967
 968     // Funny Darwin hack: This flag tells the linker that no global symbols
 969     // contain code that falls through to other global symbols (e.g. the obvious
 970     // implementation of multiple entry points).  If this doesn't occur, the
 971     // linker can safely perform dead code stripping.  Since LLVM never
 972     // generates code that does this, it is always safe to set.
 973     O << "\t.subsections_via_symbols\n";
 974   }
 975
 976   if (Subtarget->isTargetCOFF()) {
 977     for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 978          I != E; ++I)
 979       if (I->hasDLLExportLinkage())
 980         DLLExportedGVs.insert(Mang->getMangledName(I));
 981
 982     if (Subtarget->isTargetCygMing()) {
 983       // Emit type information for external functions
 984       for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
 985            i != e; ++i) {
 986         O << "\t.def\t " << i->getKeyData()
 987         << ";\t.scl\t" << COFF::C_EXT
 988         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 989         << ";\t.endef\n";
 990       }
 991     }
 992
 993     // Output linker support code for dllexported globals on windows.
 994     if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
 995       // dllexport symbols only exist on coff targets.
 996       TargetLoweringObjectFileCOFF &TLOFCOFF =
 997         static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
 998
 999       OutStreamer.SwitchSection(TLOFCOFF.getCOFFSection(".section .drectve",
1000                                                         true,
1001                                                    SectionKind::getMetadata()));
1002
1003       for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1004            e = DLLExportedGVs.end(); i != e; ++i)
1005         O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1006
1007       for (StringSet<>::iterator i = DLLExportedFns.begin(),
1008            e = DLLExportedFns.end();
1009            i != e; ++i)
1010         O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1011     }
1012   }
1013
1014   // Do common shutdown.
1015   return AsmPrinter::doFinalization(M);
1016 }
1017