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 "llvm/CallingConv.h"
  23 #include "llvm/DerivedTypes.h"
  24 #include "llvm/Module.h"
  25 #include "llvm/Type.h"
  26 #include "llvm/Assembly/Writer.h"
  27 #include "llvm/MC/MCContext.h"
  28 #include "llvm/MC/MCSectionMachO.h"
  29 #include "llvm/MC/MCStreamer.h"
  30 #include "llvm/MC/MCSymbol.h"
  31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  32 #include "llvm/Support/ErrorHandling.h"
  33 #include "llvm/Support/FormattedStream.h"
  34 #include "llvm/Support/Mangler.h"
  35 #include "llvm/MC/MCAsmInfo.h"
  36 #include "llvm/Target/TargetLoweringObjectFile.h"
  37 #include "llvm/Target/TargetOptions.h"
  38 #include "llvm/ADT/SmallString.h"
  39 #include "llvm/ADT/Statistic.h"
  40 using namespace llvm;
  41
  42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  43
  44 //===----------------------------------------------------------------------===//
  45 // Primitive Helper Functions.
  46 //===----------------------------------------------------------------------===//
  47
  48 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
  49   // FIXME: the actual label generated doesn't matter here!  Just mangle in
  50   // something unique (the function number) with Private prefix.
  51   if (Subtarget->isTargetDarwin())
  52     O << "\"L" << getFunctionNumber() << "$pb\"";
  53   else {
  54     assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
  55     O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
  56   }
  57 }
  58
  59 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
  60                                                     const TargetData *TD) {
  61   X86MachineFunctionInfo Info;
  62   uint64_t Size = 0;
  63
  64   switch (F->getCallingConv()) {
  65   case CallingConv::X86_StdCall:
  66     Info.setDecorationStyle(StdCall);
  67     break;
  68   case CallingConv::X86_FastCall:
  69     Info.setDecorationStyle(FastCall);
  70     break;
  71   default:
  72     return Info;
  73   }
  74
  75   unsigned argNum = 1;
  76   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
  77        AI != AE; ++AI, ++argNum) {
  78     const Type* Ty = AI->getType();
  79
  80     // 'Dereference' type in case of byval parameter attribute
  81     if (F->paramHasAttr(argNum, Attribute::ByVal))
  82       Ty = cast<PointerType>(Ty)->getElementType();
  83
  84     // Size should be aligned to DWORD boundary
  85     Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
  86   }
  87
  88   // We're not supporting tooooo huge arguments :)
  89   Info.setBytesToPopOnReturn((unsigned int)Size);
  90   return Info;
  91 }
  92
  93 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
  94 /// various name decorations for Cygwin and MingW.
  95 void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
  96                                            const GlobalValue *GV) {
  97   assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
  98
  99   const Function *F = dyn_cast<Function>(GV);
 100   if (!F) return;
 101
 102   // Save function name for later type emission.
 103   if (F->isDeclaration())
 104     CygMingStubs.insert(StringRef(Name.data(), Name.size()));
 105
 106   // We don't want to decorate non-stdcall or non-fastcall functions right now
 107   CallingConv::ID CC = F->getCallingConv();
 108   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
 109     return;
 110
 111
 112   const X86MachineFunctionInfo *Info;
 113
 114   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
 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   if (Info->getDecorationStyle() == None) return;
 124   const FunctionType *FT = F->getFunctionType();
 125
 126   // "Pure" variadic functions do not receive @0 suffix.
 127   if (!FT->isVarArg() || FT->getNumParams() == 0 ||
 128       (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 129     raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
 130
 131   if (Info->getDecorationStyle() == FastCall) {
 132     if (Name[0] == '_')
 133       Name[0] = '@';
 134     else
 135       Name.insert(Name.begin(), '@');
 136   }
 137 }
 138
 139 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
 140 /// various name decorations for Cygwin and MingW.
 141 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
 142                                            const GlobalValue *GV) {
 143   SmallString<128> NameStr(Name.begin(), Name.end());
 144   DecorateCygMingName(NameStr, GV);
 145   Name.assign(NameStr.begin(), NameStr.end());
 146 }
 147
 148 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 149   unsigned FnAlign = MF.getAlignment();
 150   const Function *F = MF.getFunction();
 151
 152   if (Subtarget->isTargetCygMing())
 153     DecorateCygMingName(CurrentFnName, F);
 154
 155   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
 156   EmitAlignment(FnAlign, F);
 157
 158   switch (F->getLinkage()) {
 159   default: llvm_unreachable("Unknown linkage type!");
 160   case Function::InternalLinkage:  // Symbols default to internal.
 161   case Function::PrivateLinkage:
 162     break;
 163   case Function::DLLExportLinkage:
 164   case Function::ExternalLinkage:
 165     O << "\t.globl\t" << CurrentFnName << '\n';
 166     break;
 167   case Function::LinkerPrivateLinkage:
 168   case Function::LinkOnceAnyLinkage:
 169   case Function::LinkOnceODRLinkage:
 170   case Function::WeakAnyLinkage:
 171   case Function::WeakODRLinkage:
 172     if (Subtarget->isTargetDarwin()) {
 173       O << "\t.globl\t" << CurrentFnName << '\n';
 174       O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
 175     } else if (Subtarget->isTargetCygMing()) {
 176       O << "\t.globl\t" << CurrentFnName << "\n"
 177            "\t.linkonce discard\n";
 178     } else {
 179       O << "\t.weak\t" << CurrentFnName << '\n';
 180     }
 181     break;
 182   }
 183
 184   printVisibility(CurrentFnName, F->getVisibility());
 185
 186   if (Subtarget->isTargetELF())
 187     O << "\t.type\t" << CurrentFnName << ",@function\n";
 188   else if (Subtarget->isTargetCygMing()) {
 189     O << "\t.def\t " << CurrentFnName
 190       << ";\t.scl\t" <<
 191       (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
 192       << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 193       << ";\t.endef\n";
 194   }
 195
 196   O << CurrentFnName << ':';
 197   if (VerboseAsm) {
 198     O.PadToColumn(MAI->getCommentColumn());
 199     O << MAI->getCommentString() << ' ';
 200     WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
 201   }
 202   O << '\n';
 203
 204   // Add some workaround for linkonce linkage on Cygwin\MinGW
 205   if (Subtarget->isTargetCygMing() &&
 206       (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
 207     O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
 208 }
 209
 210 /// runOnMachineFunction - This uses the printMachineInstruction()
 211 /// method to print assembly for each instruction.
 212 ///
 213 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 214   const Function *F = MF.getFunction();
 215   this->MF = &MF;
 216   CallingConv::ID CC = F->getCallingConv();
 217
 218   SetupMachineFunction(MF);
 219   O << "\n\n";
 220
 221   // Populate function information map.  Actually, We don't want to populate
 222   // non-stdcall or non-fastcall functions' information right now.
 223   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
 224     FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
 225
 226   // Print out constants referenced by the function
 227   EmitConstantPool(MF.getConstantPool());
 228
 229   if (F->hasDLLExportLinkage())
 230     DLLExportedFns.insert(Mang->getMangledName(F));
 231
 232   // Print the 'header' of function
 233   emitFunctionHeader(MF);
 234
 235   // Emit pre-function debug and/or EH information.
 236   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 237     DW->BeginFunction(&MF);
 238
 239   // Print out code for the function.
 240   bool hasAnyRealCode = false;
 241   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 242        I != E; ++I) {
 243     // Print a label for the basic block.
 244     if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
 245       // This is an entry block or a block that's only reachable via a
 246       // fallthrough edge. In non-VerboseAsm mode, don't print the label.
 247     } else {
 248       EmitBasicBlockStart(I);
 249       O << '\n';
 250     }
 251     for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
 252          II != IE; ++II) {
 253       // Print the assembly for the instruction.
 254       if (!II->isLabel())
 255         hasAnyRealCode = true;
 256       printMachineInstruction(II);
 257     }
 258   }
 259
 260   if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
 261     // If the function is empty, then we need to emit *something*. Otherwise,
 262     // the function's label might be associated with something that it wasn't
 263     // meant to be associated with. We emit a noop in this situation.
 264     // We are assuming inline asms are code.
 265     O << "\tnop\n";
 266   }
 267
 268   if (MAI->hasDotTypeDotSizeDirective())
 269     O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
 270
 271   // Emit post-function debug information.
 272   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 273     DW->EndFunction(&MF);
 274
 275   // Print out jump tables referenced by the function.
 276   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 277
 278   // We didn't modify anything.
 279   return false;
 280 }
 281
 282 /// printSymbolOperand - Print a raw symbol reference operand.  This handles
 283 /// jump tables, constant pools, global address and external symbols, all of
 284 /// which print to a label with various suffixes for relocation types etc.
 285 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
 286   switch (MO.getType()) {
 287   default: llvm_unreachable("unknown symbol type!");
 288   case MachineOperand::MO_JumpTableIndex:
 289     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 290       << MO.getIndex();
 291     break;
 292   case MachineOperand::MO_ConstantPoolIndex:
 293     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 294       << MO.getIndex();
 295     printOffset(MO.getOffset());
 296     break;
 297   case MachineOperand::MO_GlobalAddress: {
 298     const GlobalValue *GV = MO.getGlobal();
 299
 300     const char *Suffix = "";
 301     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 302       Suffix = "$stub";
 303     else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 304              MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
 305              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 306       Suffix = "$non_lazy_ptr";
 307
 308     std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
 309     if (Subtarget->isTargetCygMing())
 310       DecorateCygMingName(Name, GV);
 311
 312     // Handle dllimport linkage.
 313     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
 314       Name = "__imp_" + Name;
 315
 316     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 317         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
 318       SmallString<128> NameStr;
 319       Mang->getNameWithPrefix(NameStr, GV, true);
 320       NameStr += "$non_lazy_ptr";
 321       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 322       MCSymbol *&StubSym = GVStubs[Sym];
 323       if (StubSym == 0) {
 324         NameStr.clear();
 325         Mang->getNameWithPrefix(NameStr, GV, false);
 326         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 327       }
 328     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
 329       SmallString<128> NameStr;
 330       Mang->getNameWithPrefix(NameStr, GV, true);
 331       NameStr += "$non_lazy_ptr";
 332       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 333       MCSymbol *&StubSym = HiddenGVStubs[Sym];
 334       if (StubSym == 0) {
 335         NameStr.clear();
 336         Mang->getNameWithPrefix(NameStr, GV, false);
 337         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 338       }
 339     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 340       SmallString<128> NameStr;
 341       Mang->getNameWithPrefix(NameStr, GV, true);
 342       NameStr += "$stub";
 343       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 344       MCSymbol *&StubSym = FnStubs[Sym];
 345       if (StubSym == 0) {
 346         NameStr.clear();
 347         Mang->getNameWithPrefix(NameStr, GV, false);
 348         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 349       }
 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] == '$')
 355       O << '(' << Name << ')';
 356     else
 357       O << Name;
 358
 359     printOffset(MO.getOffset());
 360     break;
 361   }
 362   case MachineOperand::MO_ExternalSymbol: {
 363     std::string Name = Mang->makeNameProper(MO.getSymbolName());
 364     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 365       Name += "$stub";
 366       MCSymbol *&StubSym = FnStubs[OutContext.GetOrCreateSymbol(Name)];
 367       if (StubSym == 0) {
 368         Name.erase(Name.end()-5, Name.end());
 369         StubSym = OutContext.GetOrCreateSymbol(Name);
 370       }
 371     }
 372
 373     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 374     // to avoid having it look like an integer immediate to the assembler.
 375     if (Name[0] == '$')
 376       O << '(' << Name << ')';
 377     else
 378       O << Name;
 379     break;
 380   }
 381   }
 382
 383   switch (MO.getTargetFlags()) {
 384   default:
 385     llvm_unreachable("Unknown target flag on GV operand");
 386   case X86II::MO_NO_FLAG:    // No flag.
 387     break;
 388   case X86II::MO_DARWIN_NONLAZY:
 389   case X86II::MO_DLLIMPORT:
 390   case X86II::MO_DARWIN_STUB:
 391     // These affect the name of the symbol, not any suffix.
 392     break;
 393   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
 394     O << " + [.-";
 395     PrintPICBaseSymbol();
 396     O << ']';
 397     break;
 398   case X86II::MO_PIC_BASE_OFFSET:
 399   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
 400   case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
 401     O << '-';
 402     PrintPICBaseSymbol();
 403     break;
 404   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
 405   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
 406   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
 407   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
 408   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
 409   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
 410   case X86II::MO_GOT:       O << "@GOT";       break;
 411   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
 412   case X86II::MO_PLT:       O << "@PLT";       break;
 413   }
 414 }
 415
 416 /// print_pcrel_imm - This is used to print an immediate value that ends up
 417 /// being encoded as a pc-relative value.  These print slightly differently, for
 418 /// example, a $ is not emitted.
 419 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
 420   const MachineOperand &MO = MI->getOperand(OpNo);
 421   switch (MO.getType()) {
 422   default: llvm_unreachable("Unknown pcrel immediate operand");
 423   case MachineOperand::MO_Immediate:
 424     O << MO.getImm();
 425     return;
 426   case MachineOperand::MO_MachineBasicBlock:
 427     GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
 428     return;
 429   case MachineOperand::MO_GlobalAddress:
 430   case MachineOperand::MO_ExternalSymbol:
 431     printSymbolOperand(MO);
 432     return;
 433   }
 434 }
 435
 436
 437 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 438                                     const char *Modifier) {
 439   const MachineOperand &MO = MI->getOperand(OpNo);
 440   switch (MO.getType()) {
 441   default: llvm_unreachable("unknown operand type!");
 442   case MachineOperand::MO_Register: {
 443     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
 444            "Virtual registers should not make it this far!");
 445     O << '%';
 446     unsigned Reg = MO.getReg();
 447     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 448       EVT VT = (strcmp(Modifier+6,"64") == 0) ?
 449         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 450                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 451       Reg = getX86SubSuperRegister(Reg, VT);
 452     }
 453     O << TRI->getAsmName(Reg);
 454     return;
 455   }
 456
 457   case MachineOperand::MO_Immediate:
 458     O << '$' << MO.getImm();
 459     return;
 460
 461   case MachineOperand::MO_JumpTableIndex:
 462   case MachineOperand::MO_ConstantPoolIndex:
 463   case MachineOperand::MO_GlobalAddress:
 464   case MachineOperand::MO_ExternalSymbol: {
 465     O << '$';
 466     printSymbolOperand(MO);
 467     break;
 468   }
 469   }
 470 }
 471
 472 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
 473   unsigned char value = MI->getOperand(Op).getImm();
 474   assert(value <= 7 && "Invalid ssecc argument!");
 475   switch (value) {
 476   case 0: O << "eq"; break;
 477   case 1: O << "lt"; break;
 478   case 2: O << "le"; break;
 479   case 3: O << "unord"; break;
 480   case 4: O << "neq"; break;
 481   case 5: O << "nlt"; break;
 482   case 6: O << "nle"; break;
 483   case 7: O << "ord"; break;
 484   }
 485 }
 486
 487 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
 488                                             const char *Modifier) {
 489   const MachineOperand &BaseReg  = MI->getOperand(Op);
 490   const MachineOperand &IndexReg = MI->getOperand(Op+2);
 491   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 492
 493   // If we really don't want to print out (rip), don't.
 494   bool HasBaseReg = BaseReg.getReg() != 0;
 495   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
 496       BaseReg.getReg() == X86::RIP)
 497     HasBaseReg = false;
 498
 499   // HasParenPart - True if we will print out the () part of the mem ref.
 500   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
 501
 502   if (DispSpec.isImm()) {
 503     int DispVal = DispSpec.getImm();
 504     if (DispVal || !HasParenPart)
 505       O << DispVal;
 506   } else {
 507     assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 508            DispSpec.isJTI() || DispSpec.isSymbol());
 509     printSymbolOperand(MI->getOperand(Op+3));
 510   }
 511
 512   if (HasParenPart) {
 513     assert(IndexReg.getReg() != X86::ESP &&
 514            "X86 doesn't allow scaling by ESP");
 515
 516     O << '(';
 517     if (HasBaseReg)
 518       printOperand(MI, Op, Modifier);
 519
 520     if (IndexReg.getReg()) {
 521       O << ',';
 522       printOperand(MI, Op+2, Modifier);
 523       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 524       if (ScaleVal != 1)
 525         O << ',' << ScaleVal;
 526     }
 527     O << ')';
 528   }
 529 }
 530
 531 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 532                                          const char *Modifier) {
 533   assert(isMem(MI, Op) && "Invalid memory reference!");
 534   const MachineOperand &Segment = MI->getOperand(Op+4);
 535   if (Segment.getReg()) {
 536     printOperand(MI, Op+4, Modifier);
 537     O << ':';
 538   }
 539   printLeaMemReference(MI, Op, Modifier);
 540 }
 541
 542 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
 543                                            const MachineBasicBlock *MBB) const {
 544   if (!MAI->getSetDirective())
 545     return;
 546
 547   // We don't need .set machinery if we have GOT-style relocations
 548   if (Subtarget->isPICStyleGOT())
 549     return;
 550
 551   O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
 552     << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
 553
 554   GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 555
 556   if (Subtarget->isPICStyleRIPRel())
 557     O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 558       << '_' << uid << '\n';
 559   else {
 560     O << '-';
 561     PrintPICBaseSymbol();
 562     O << '\n';
 563   }
 564 }
 565
 566
 567 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
 568   PrintPICBaseSymbol();
 569   O << '\n';
 570   PrintPICBaseSymbol();
 571   O << ':';
 572 }
 573
 574 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
 575                                               const MachineBasicBlock *MBB,
 576                                               unsigned uid) const {
 577   const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
 578     MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
 579
 580   O << JTEntryDirective << ' ';
 581
 582   if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
 583     O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
 584       << '_' << uid << "_set_" << MBB->getNumber();
 585   } else if (Subtarget->isPICStyleGOT()) {
 586     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 587     O << "@GOTOFF";
 588   } else
 589     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 590 }
 591
 592 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
 593   unsigned Reg = MO.getReg();
 594   switch (Mode) {
 595   default: return true;  // Unknown mode.
 596   case 'b': // Print QImode register
 597     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 598     break;
 599   case 'h': // Print QImode high register
 600     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 601     break;
 602   case 'w': // Print HImode register
 603     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 604     break;
 605   case 'k': // Print SImode register
 606     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 607     break;
 608   case 'q': // Print DImode register
 609     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 610     break;
 611   }
 612
 613   O << '%'<< TRI->getAsmName(Reg);
 614   return false;
 615 }
 616
 617 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 618 ///
 619 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 620                                        unsigned AsmVariant,
 621                                        const char *ExtraCode) {
 622   // Does this asm operand have a single letter operand modifier?
 623   if (ExtraCode && ExtraCode[0]) {
 624     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 625
 626     const MachineOperand &MO = MI->getOperand(OpNo);
 627
 628     switch (ExtraCode[0]) {
 629     default: return true;  // Unknown modifier.
 630     case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
 631       if (MO.isImm()) {
 632         O << MO.getImm();
 633         return false;
 634       }
 635       if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
 636         printSymbolOperand(MO);
 637         return false;
 638       }
 639       if (MO.isReg()) {
 640         O << '(';
 641         printOperand(MI, OpNo);
 642         O << ')';
 643         return false;
 644       }
 645       return true;
 646
 647     case 'c': // Don't print "$" before a global var name or constant.
 648       if (MO.isImm())
 649         O << MO.getImm();
 650       else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
 651         printSymbolOperand(MO);
 652       else
 653         printOperand(MI, OpNo);
 654       return false;
 655
 656     case 'A': // Print '*' before a register (it must be a register)
 657       if (MO.isReg()) {
 658         O << '*';
 659         printOperand(MI, OpNo);
 660         return false;
 661       }
 662       return true;
 663
 664     case 'b': // Print QImode register
 665     case 'h': // Print QImode high register
 666     case 'w': // Print HImode register
 667     case 'k': // Print SImode register
 668     case 'q': // Print DImode register
 669       if (MO.isReg())
 670         return printAsmMRegister(MO, ExtraCode[0]);
 671       printOperand(MI, OpNo);
 672       return false;
 673
 674     case 'P': // This is the operand of a call, treat specially.
 675       print_pcrel_imm(MI, OpNo);
 676       return false;
 677
 678     case 'n':  // Negate the immediate or print a '-' before the operand.
 679       // Note: this is a temporary solution. It should be handled target
 680       // independently as part of the 'MC' work.
 681       if (MO.isImm()) {
 682         O << -MO.getImm();
 683         return false;
 684       }
 685       O << '-';
 686     }
 687   }
 688
 689   printOperand(MI, OpNo);
 690   return false;
 691 }
 692
 693 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 694                                              unsigned OpNo,
 695                                              unsigned AsmVariant,
 696                                              const char *ExtraCode) {
 697   if (ExtraCode && ExtraCode[0]) {
 698     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 699
 700     switch (ExtraCode[0]) {
 701     default: return true;  // Unknown modifier.
 702     case 'b': // Print QImode register
 703     case 'h': // Print QImode high register
 704     case 'w': // Print HImode register
 705     case 'k': // Print SImode register
 706     case 'q': // Print SImode register
 707       // These only apply to registers, ignore on mem.
 708       break;
 709     case 'P': // Don't print @PLT, but do print as memory.
 710       printMemReference(MI, OpNo, "no-rip");
 711       return false;
 712     }
 713   }
 714   printMemReference(MI, OpNo);
 715   return false;
 716 }
 717
 718
 719
 720 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
 721 /// AT&T syntax to the current output stream.
 722 ///
 723 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 724   ++EmittedInsts;
 725
 726   processDebugLoc(MI->getDebugLoc());
 727
 728   printInstructionThroughMCStreamer(MI);
 729
 730   if (VerboseAsm && !MI->getDebugLoc().isUnknown())
 731     EmitComments(*MI);
 732   O << '\n';
 733 }
 734
 735 void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
 736   const TargetData *TD = TM.getTargetData();
 737
 738   if (!GVar->hasInitializer())
 739     return;   // External global require no code
 740
 741   // Check to see if this is a special global used by LLVM, if so, emit it.
 742   if (EmitSpecialLLVMGlobal(GVar)) {
 743     if (Subtarget->isTargetDarwin() &&
 744         TM.getRelocationModel() == Reloc::Static) {
 745       if (GVar->getName() == "llvm.global_ctors")
 746         O << ".reference .constructors_used\n";
 747       else if (GVar->getName() == "llvm.global_dtors")
 748         O << ".reference .destructors_used\n";
 749     }
 750     return;
 751   }
 752
 753   std::string name = Mang->getMangledName(GVar);
 754   Constant *C = GVar->getInitializer();
 755   const Type *Type = C->getType();
 756   unsigned Size = TD->getTypeAllocSize(Type);
 757   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 758
 759   printVisibility(name, GVar->getVisibility());
 760
 761   if (Subtarget->isTargetELF())
 762     O << "\t.type\t" << name << ",@object\n";
 763
 764
 765   SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
 766   const MCSection *TheSection =
 767     getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
 768   OutStreamer.SwitchSection(TheSection);
 769
 770   // FIXME: get this stuff from section kind flags.
 771   if (C->isNullValue() && !GVar->hasSection() &&
 772       // Don't put things that should go in the cstring section into "comm".
 773       !TheSection->getKind().isMergeableCString()) {
 774     if (GVar->hasExternalLinkage()) {
 775       if (const char *Directive = MAI->getZeroFillDirective()) {
 776         O << "\t.globl " << name << '\n';
 777         O << Directive << "__DATA, __common, " << name << ", "
 778           << Size << ", " << Align << '\n';
 779         return;
 780       }
 781     }
 782
 783     if (!GVar->isThreadLocal() &&
 784         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 785       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 786
 787       if (MAI->getLCOMMDirective() != NULL) {
 788         if (GVar->hasLocalLinkage()) {
 789           O << MAI->getLCOMMDirective() << name << ',' << Size;
 790           if (Subtarget->isTargetDarwin())
 791             O << ',' << Align;
 792         } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
 793           O << "\t.globl " << name << '\n'
 794             << MAI->getWeakDefDirective() << name << '\n';
 795           EmitAlignment(Align, GVar);
 796           O << name << ":";
 797           if (VerboseAsm) {
 798             O.PadToColumn(MAI->getCommentColumn());
 799             O << MAI->getCommentString() << ' ';
 800             WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 801           }
 802           O << '\n';
 803           EmitGlobalConstant(C);
 804           return;
 805         } else {
 806           O << MAI->getCOMMDirective()  << name << ',' << Size;
 807           if (MAI->getCOMMDirectiveTakesAlignment())
 808             O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 809         }
 810       } else {
 811         if (!Subtarget->isTargetCygMing()) {
 812           if (GVar->hasLocalLinkage())
 813             O << "\t.local\t" << name << '\n';
 814         }
 815         O << MAI->getCOMMDirective()  << name << ',' << Size;
 816         if (MAI->getCOMMDirectiveTakesAlignment())
 817           O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 818       }
 819       if (VerboseAsm) {
 820         O.PadToColumn(MAI->getCommentColumn());
 821         O << MAI->getCommentString() << ' ';
 822         WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 823       }
 824       O << '\n';
 825       return;
 826     }
 827   }
 828
 829   switch (GVar->getLinkage()) {
 830   case GlobalValue::CommonLinkage:
 831   case GlobalValue::LinkOnceAnyLinkage:
 832   case GlobalValue::LinkOnceODRLinkage:
 833   case GlobalValue::WeakAnyLinkage:
 834   case GlobalValue::WeakODRLinkage:
 835   case GlobalValue::LinkerPrivateLinkage:
 836     if (Subtarget->isTargetDarwin()) {
 837       O << "\t.globl " << name << '\n'
 838         << MAI->getWeakDefDirective() << name << '\n';
 839     } else if (Subtarget->isTargetCygMing()) {
 840       O << "\t.globl\t" << name << "\n"
 841            "\t.linkonce same_size\n";
 842     } else {
 843       O << "\t.weak\t" << name << '\n';
 844     }
 845     break;
 846   case GlobalValue::DLLExportLinkage:
 847   case GlobalValue::AppendingLinkage:
 848     // FIXME: appending linkage variables should go into a section of
 849     // their name or something.  For now, just emit them as external.
 850   case GlobalValue::ExternalLinkage:
 851     // If external or appending, declare as a global symbol
 852     O << "\t.globl " << name << '\n';
 853     // FALL THROUGH
 854   case GlobalValue::PrivateLinkage:
 855   case GlobalValue::InternalLinkage:
 856      break;
 857   default:
 858     llvm_unreachable("Unknown linkage type!");
 859   }
 860
 861   EmitAlignment(Align, GVar);
 862   O << name << ":";
 863   if (VerboseAsm){
 864     O.PadToColumn(MAI->getCommentColumn());
 865     O << MAI->getCommentString() << ' ';
 866     WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 867   }
 868   O << '\n';
 869
 870   EmitGlobalConstant(C);
 871
 872   if (MAI->hasDotTypeDotSizeDirective())
 873     O << "\t.size\t" << name << ", " << Size << '\n';
 874 }
 875
 876 static int SortSymbolPair(const void *LHS, const void *RHS) {
 877   MCSymbol *LHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)LHS)->first;
 878   MCSymbol *RHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)RHS)->first;
 879   return LHSS->getName().compare(RHSS->getName());
 880 }
 881
 882 /// GetSortedStubs - Return the entries from a DenseMap in a deterministic
 883 /// sorted orer.
 884 static std::vector<std::pair<MCSymbol*, MCSymbol*> >
 885 GetSortedStubs(const DenseMap<MCSymbol*, MCSymbol*> &Map) {
 886   assert(!Map.empty());
 887   std::vector<std::pair<MCSymbol*, MCSymbol*> > List(Map.begin(), Map.end());
 888   qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
 889   return List;
 890 }
 891
 892 bool X86ATTAsmPrinter::doFinalization(Module &M) {
 893   // Print out module-level global variables here.
 894   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 895        I != E; ++I) {
 896     if (I->hasDLLExportLinkage())
 897       DLLExportedGVs.insert(Mang->getMangledName(I));
 898   }
 899
 900   if (Subtarget->isTargetDarwin()) {
 901     // All darwin targets use mach-o.
 902     TargetLoweringObjectFileMachO &TLOFMacho =
 903       static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
 904
 905     // Add the (possibly multiple) personalities to the set of global value
 906     // stubs.  Only referenced functions get into the Personalities list.
 907     if (MAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
 908       const std::vector<Function*> &Personalities = MMI->getPersonalities();
 909       for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
 910         if (Personalities[i] == 0)
 911           continue;
 912
 913         SmallString<128> Name;
 914         Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
 915         Name += "$non_lazy_ptr";
 916         MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
 917
 918         MCSymbol *&StubName = GVStubs[NLPName];
 919         if (StubName != 0) continue;
 920
 921
 922         Name.clear();
 923         Mang->getNameWithPrefix(Name, Personalities[i], false);
 924         StubName = OutContext.GetOrCreateSymbol(Name.str());
 925       }
 926     }
 927
 928     // Output stubs for dynamically-linked functions
 929     if (!FnStubs.empty()) {
 930       const MCSection *TheSection =
 931         TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
 932                                   MCSectionMachO::S_SYMBOL_STUBS |
 933                                   MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
 934                                   MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 935                                   5, SectionKind::getMetadata());
 936       OutStreamer.SwitchSection(TheSection);
 937
 938       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 939         = GetSortedStubs(FnStubs);
 940       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 941         Stubs[i].first->print(O, MAI);
 942         O << ":\n" << "\t.indirect_symbol ";
 943         // Get the MCSymbol without the $stub suffix.
 944         Stubs[i].second->print(O, MAI);
 945         O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
 946       }
 947       O << '\n';
 948     }
 949
 950     // Output stubs for external and common global variables.
 951     if (!GVStubs.empty()) {
 952       const MCSection *TheSection =
 953         TLOFMacho.getMachOSection("__IMPORT", "__pointers",
 954                                   MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 955                                   SectionKind::getMetadata());
 956       OutStreamer.SwitchSection(TheSection);
 957
 958       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 959         = GetSortedStubs(GVStubs);
 960       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 961         Stubs[i].first->print(O, MAI);
 962         O << ":\n\t.indirect_symbol ";
 963         Stubs[i].second->print(O, MAI);
 964         O << "\n\t.long\t0\n";
 965       }
 966     }
 967
 968     if (!HiddenGVStubs.empty()) {
 969       OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
 970       EmitAlignment(2);
 971
 972       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 973         = GetSortedStubs(HiddenGVStubs);
 974       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 975         Stubs[i].first->print(O, MAI);
 976         O << ":\n" << MAI->getData32bitsDirective();
 977         Stubs[i].second->print(O, MAI);
 978         O << '\n';
 979       }
 980     }
 981
 982     // Funny Darwin hack: This flag tells the linker that no global symbols
 983     // contain code that falls through to other global symbols (e.g. the obvious
 984     // implementation of multiple entry points).  If this doesn't occur, the
 985     // linker can safely perform dead code stripping.  Since LLVM never
 986     // generates code that does this, it is always safe to set.
 987     O << "\t.subsections_via_symbols\n";
 988   } else if (Subtarget->isTargetCygMing()) {
 989     // Emit type information for external functions
 990     for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
 991          i != e; ++i) {
 992       O << "\t.def\t " << i->getKeyData()
 993         << ";\t.scl\t" << COFF::C_EXT
 994         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 995         << ";\t.endef\n";
 996     }
 997   }
 998
 999
1000   // Output linker support code for dllexported globals on windows.
1001   if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
1002     // dllexport symbols only exist on coff targets.
1003     TargetLoweringObjectFileCOFF &TLOFMacho =
1004       static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
1005
1006     OutStreamer.SwitchSection(TLOFMacho.getCOFFSection(".section .drectve",true,
1007                                                  SectionKind::getMetadata()));
1008
1009     for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1010          e = DLLExportedGVs.end(); i != e; ++i)
1011       O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1012
1013     for (StringSet<>::iterator i = DLLExportedFns.begin(),
1014          e = DLLExportedFns.end();
1015          i != e; ++i)
1016       O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1017   }
1018
1019   // Do common shutdown.
1020   return AsmPrinter::doFinalization(M);
1021 }
1022