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/Support/ErrorHandling.h"
  35 #include "llvm/Support/FormattedStream.h"
  36 #include "llvm/Support/Mangler.h"
  37 #include "llvm/MC/MCAsmInfo.h"
  38 #include "llvm/Target/TargetLoweringObjectFile.h"
  39 #include "llvm/Target/TargetOptions.h"
  40 #include "llvm/ADT/SmallString.h"
  41 #include "llvm/ADT/Statistic.h"
  42 using namespace llvm;
  43
  44 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  45
  46 //===----------------------------------------------------------------------===//
  47 // Primitive Helper Functions.
  48 //===----------------------------------------------------------------------===//
  49
  50 void X86ATTAsmPrinter::printMCInst(const MCInst *MI) {
  51   X86ATTInstPrinter(O, MAI).printInstruction(MI);
  52 }
  53
  54 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
  55   // FIXME: Gross const cast hack.
  56   X86ATTAsmPrinter *AP = const_cast<X86ATTAsmPrinter*>(this);
  57   X86MCInstLower(OutContext, 0, *AP).GetPICBaseSymbol()->print(O, MAI);
  58 }
  59
  60 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
  61                                                     const TargetData *TD) {
  62   X86MachineFunctionInfo Info;
  63   uint64_t Size = 0;
  64
  65   switch (F->getCallingConv()) {
  66   case CallingConv::X86_StdCall:
  67     Info.setDecorationStyle(StdCall);
  68     break;
  69   case CallingConv::X86_FastCall:
  70     Info.setDecorationStyle(FastCall);
  71     break;
  72   default:
  73     return Info;
  74   }
  75
  76   unsigned argNum = 1;
  77   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
  78        AI != AE; ++AI, ++argNum) {
  79     const Type* Ty = AI->getType();
  80
  81     // 'Dereference' type in case of byval parameter attribute
  82     if (F->paramHasAttr(argNum, Attribute::ByVal))
  83       Ty = cast<PointerType>(Ty)->getElementType();
  84
  85     // Size should be aligned to DWORD boundary
  86     Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
  87   }
  88
  89   // We're not supporting tooooo huge arguments :)
  90   Info.setBytesToPopOnReturn((unsigned int)Size);
  91   return Info;
  92 }
  93
  94 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
  95 /// various name decorations for Cygwin and MingW.
  96 void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
  97                                            const GlobalValue *GV) {
  98   assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
  99
 100   const Function *F = dyn_cast<Function>(GV);
 101   if (!F) return;
 102
 103   // Save function name for later type emission.
 104   if (F->isDeclaration())
 105     CygMingStubs.insert(StringRef(Name.data(), Name.size()));
 106
 107   // We don't want to decorate non-stdcall or non-fastcall functions right now
 108   CallingConv::ID CC = F->getCallingConv();
 109   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
 110     return;
 111
 112
 113   const X86MachineFunctionInfo *Info;
 114
 115   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
 116   if (info_item == FunctionInfoMap.end()) {
 117     // Calculate apropriate function info and populate map
 118     FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
 119     Info = &FunctionInfoMap[F];
 120   } else {
 121     Info = &info_item->second;
 122   }
 123
 124   if (Info->getDecorationStyle() == None) return;
 125   const FunctionType *FT = F->getFunctionType();
 126
 127   // "Pure" variadic functions do not receive @0 suffix.
 128   if (!FT->isVarArg() || FT->getNumParams() == 0 ||
 129       (FT->getNumParams() == 1 && F->hasStructRetAttr()))
 130     raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
 131
 132   if (Info->getDecorationStyle() == FastCall) {
 133     if (Name[0] == '_')
 134       Name[0] = '@';
 135     else
 136       Name.insert(Name.begin(), '@');
 137   }
 138 }
 139
 140 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
 141 /// various name decorations for Cygwin and MingW.
 142 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
 143                                            const GlobalValue *GV) {
 144   SmallString<128> NameStr(Name.begin(), Name.end());
 145   DecorateCygMingName(NameStr, GV);
 146   Name.assign(NameStr.begin(), NameStr.end());
 147 }
 148
 149 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 150   unsigned FnAlign = MF.getAlignment();
 151   const Function *F = MF.getFunction();
 152
 153   if (Subtarget->isTargetCygMing())
 154     DecorateCygMingName(CurrentFnName, F);
 155
 156   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
 157   EmitAlignment(FnAlign, F);
 158
 159   switch (F->getLinkage()) {
 160   default: llvm_unreachable("Unknown linkage type!");
 161   case Function::InternalLinkage:  // Symbols default to internal.
 162   case Function::PrivateLinkage:
 163     break;
 164   case Function::DLLExportLinkage:
 165   case Function::ExternalLinkage:
 166     O << "\t.globl\t" << CurrentFnName << '\n';
 167     break;
 168   case Function::LinkerPrivateLinkage:
 169   case Function::LinkOnceAnyLinkage:
 170   case Function::LinkOnceODRLinkage:
 171   case Function::WeakAnyLinkage:
 172   case Function::WeakODRLinkage:
 173     if (Subtarget->isTargetDarwin()) {
 174       O << "\t.globl\t" << CurrentFnName << '\n';
 175       O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
 176     } else if (Subtarget->isTargetCygMing()) {
 177       O << "\t.globl\t" << CurrentFnName << "\n"
 178            "\t.linkonce discard\n";
 179     } else {
 180       O << "\t.weak\t" << CurrentFnName << '\n';
 181     }
 182     break;
 183   }
 184
 185   printVisibility(CurrentFnName, F->getVisibility());
 186
 187   if (Subtarget->isTargetELF())
 188     O << "\t.type\t" << CurrentFnName << ",@function\n";
 189   else if (Subtarget->isTargetCygMing()) {
 190     O << "\t.def\t " << CurrentFnName
 191       << ";\t.scl\t" <<
 192       (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
 193       << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 194       << ";\t.endef\n";
 195   }
 196
 197   O << CurrentFnName << ':';
 198   if (VerboseAsm) {
 199     O.PadToColumn(MAI->getCommentColumn());
 200     O << MAI->getCommentString() << ' ';
 201     WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
 202   }
 203   O << '\n';
 204
 205   // Add some workaround for linkonce linkage on Cygwin\MinGW
 206   if (Subtarget->isTargetCygMing() &&
 207       (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
 208     O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
 209 }
 210
 211 /// runOnMachineFunction - This uses the printMachineInstruction()
 212 /// method to print assembly for each instruction.
 213 ///
 214 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 215   const Function *F = MF.getFunction();
 216   this->MF = &MF;
 217   CallingConv::ID CC = F->getCallingConv();
 218
 219   SetupMachineFunction(MF);
 220   O << "\n\n";
 221
 222   // Populate function information map.  Actually, We don't want to populate
 223   // non-stdcall or non-fastcall functions' information right now.
 224   if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
 225     FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
 226
 227   // Print out constants referenced by the function
 228   EmitConstantPool(MF.getConstantPool());
 229
 230   if (F->hasDLLExportLinkage())
 231     DLLExportedFns.insert(Mang->getMangledName(F));
 232
 233   // Print the 'header' of function
 234   emitFunctionHeader(MF);
 235
 236   // Emit pre-function debug and/or EH information.
 237   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 238     DW->BeginFunction(&MF);
 239
 240   // Print out code for the function.
 241   bool hasAnyRealCode = false;
 242   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 243        I != E; ++I) {
 244     // Print a label for the basic block.
 245     if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
 246       // This is an entry block or a block that's only reachable via a
 247       // fallthrough edge. In non-VerboseAsm mode, don't print the label.
 248     } else {
 249       EmitBasicBlockStart(I);
 250       O << '\n';
 251     }
 252     for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
 253          II != IE; ++II) {
 254       // Print the assembly for the instruction.
 255       if (!II->isLabel())
 256         hasAnyRealCode = true;
 257       printMachineInstruction(II);
 258     }
 259   }
 260
 261   if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
 262     // If the function is empty, then we need to emit *something*. Otherwise,
 263     // the function's label might be associated with something that it wasn't
 264     // meant to be associated with. We emit a noop in this situation.
 265     // We are assuming inline asms are code.
 266     O << "\tnop\n";
 267   }
 268
 269   if (MAI->hasDotTypeDotSizeDirective())
 270     O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
 271
 272   // Emit post-function debug information.
 273   if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
 274     DW->EndFunction(&MF);
 275
 276   // Print out jump tables referenced by the function.
 277   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 278
 279   // We didn't modify anything.
 280   return false;
 281 }
 282
 283 /// printSymbolOperand - Print a raw symbol reference operand.  This handles
 284 /// jump tables, constant pools, global address and external symbols, all of
 285 /// which print to a label with various suffixes for relocation types etc.
 286 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
 287   switch (MO.getType()) {
 288   default: llvm_unreachable("unknown symbol type!");
 289   case MachineOperand::MO_JumpTableIndex:
 290     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 291       << MO.getIndex();
 292     break;
 293   case MachineOperand::MO_ConstantPoolIndex:
 294     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 295       << MO.getIndex();
 296     printOffset(MO.getOffset());
 297     break;
 298   case MachineOperand::MO_GlobalAddress: {
 299     const GlobalValue *GV = MO.getGlobal();
 300
 301     const char *Suffix = "";
 302     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
 303       Suffix = "$stub";
 304     else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 305              MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
 306              MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
 307       Suffix = "$non_lazy_ptr";
 308
 309     std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
 310     if (Subtarget->isTargetCygMing())
 311       DecorateCygMingName(Name, GV);
 312
 313     // Handle dllimport linkage.
 314     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
 315       Name = "__imp_" + Name;
 316
 317     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
 318         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
 319       SmallString<128> NameStr;
 320       Mang->getNameWithPrefix(NameStr, GV, true);
 321       NameStr += "$non_lazy_ptr";
 322       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 323       MCSymbol *&StubSym = GVStubs[Sym];
 324       if (StubSym == 0) {
 325         NameStr.clear();
 326         Mang->getNameWithPrefix(NameStr, GV, false);
 327         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 328       }
 329     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
 330       SmallString<128> NameStr;
 331       Mang->getNameWithPrefix(NameStr, GV, true);
 332       NameStr += "$non_lazy_ptr";
 333       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 334       MCSymbol *&StubSym = HiddenGVStubs[Sym];
 335       if (StubSym == 0) {
 336         NameStr.clear();
 337         Mang->getNameWithPrefix(NameStr, GV, false);
 338         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 339       }
 340     } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 341       SmallString<128> NameStr;
 342       Mang->getNameWithPrefix(NameStr, GV, true);
 343       NameStr += "$stub";
 344       MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
 345       MCSymbol *&StubSym = FnStubs[Sym];
 346       if (StubSym == 0) {
 347         NameStr.clear();
 348         Mang->getNameWithPrefix(NameStr, GV, false);
 349         StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
 350       }
 351     }
 352
 353     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 354     // to avoid having it look like an integer immediate to the assembler.
 355     if (Name[0] == '$')
 356       O << '(' << Name << ')';
 357     else
 358       O << Name;
 359
 360     printOffset(MO.getOffset());
 361     break;
 362   }
 363   case MachineOperand::MO_ExternalSymbol: {
 364     std::string Name = Mang->makeNameProper(MO.getSymbolName());
 365     if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
 366       Name += "$stub";
 367       MCSymbol *&StubSym = FnStubs[OutContext.GetOrCreateSymbol(Name)];
 368       if (StubSym == 0) {
 369         Name.erase(Name.end()-5, Name.end());
 370         StubSym = OutContext.GetOrCreateSymbol(Name);
 371       }
 372     }
 373
 374     // If the name begins with a dollar-sign, enclose it in parens.  We do this
 375     // to avoid having it look like an integer immediate to the assembler.
 376     if (Name[0] == '$')
 377       O << '(' << Name << ')';
 378     else
 379       O << Name;
 380     break;
 381   }
 382   }
 383
 384   switch (MO.getTargetFlags()) {
 385   default:
 386     llvm_unreachable("Unknown target flag on GV operand");
 387   case X86II::MO_NO_FLAG:    // No flag.
 388     break;
 389   case X86II::MO_DARWIN_NONLAZY:
 390   case X86II::MO_DLLIMPORT:
 391   case X86II::MO_DARWIN_STUB:
 392     // These affect the name of the symbol, not any suffix.
 393     break;
 394   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
 395     O << " + [.-";
 396     PrintPICBaseSymbol();
 397     O << ']';
 398     break;
 399   case X86II::MO_PIC_BASE_OFFSET:
 400   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
 401   case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
 402     O << '-';
 403     PrintPICBaseSymbol();
 404     break;
 405   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
 406   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
 407   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
 408   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
 409   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
 410   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
 411   case X86II::MO_GOT:       O << "@GOT";       break;
 412   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
 413   case X86II::MO_PLT:       O << "@PLT";       break;
 414   }
 415 }
 416
 417 /// print_pcrel_imm - This is used to print an immediate value that ends up
 418 /// being encoded as a pc-relative value.  These print slightly differently, for
 419 /// example, a $ is not emitted.
 420 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
 421   const MachineOperand &MO = MI->getOperand(OpNo);
 422   switch (MO.getType()) {
 423   default: llvm_unreachable("Unknown pcrel immediate operand");
 424   case MachineOperand::MO_Immediate:
 425     O << MO.getImm();
 426     return;
 427   case MachineOperand::MO_MachineBasicBlock:
 428     GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
 429     return;
 430   case MachineOperand::MO_GlobalAddress:
 431   case MachineOperand::MO_ExternalSymbol:
 432     printSymbolOperand(MO);
 433     return;
 434   }
 435 }
 436
 437
 438 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
 439                                     const char *Modifier) {
 440   const MachineOperand &MO = MI->getOperand(OpNo);
 441   switch (MO.getType()) {
 442   default: llvm_unreachable("unknown operand type!");
 443   case MachineOperand::MO_Register: {
 444     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
 445            "Virtual registers should not make it this far!");
 446     O << '%';
 447     unsigned Reg = MO.getReg();
 448     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
 449       EVT VT = (strcmp(Modifier+6,"64") == 0) ?
 450         MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
 451                     ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
 452       Reg = getX86SubSuperRegister(Reg, VT);
 453     }
 454     O << TRI->getAsmName(Reg);
 455     return;
 456   }
 457
 458   case MachineOperand::MO_Immediate:
 459     O << '$' << MO.getImm();
 460     return;
 461
 462   case MachineOperand::MO_JumpTableIndex:
 463   case MachineOperand::MO_ConstantPoolIndex:
 464   case MachineOperand::MO_GlobalAddress:
 465   case MachineOperand::MO_ExternalSymbol: {
 466     O << '$';
 467     printSymbolOperand(MO);
 468     break;
 469   }
 470   }
 471 }
 472
 473 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
 474   unsigned char value = MI->getOperand(Op).getImm();
 475   assert(value <= 7 && "Invalid ssecc argument!");
 476   switch (value) {
 477   case 0: O << "eq"; break;
 478   case 1: O << "lt"; break;
 479   case 2: O << "le"; break;
 480   case 3: O << "unord"; break;
 481   case 4: O << "neq"; break;
 482   case 5: O << "nlt"; break;
 483   case 6: O << "nle"; break;
 484   case 7: O << "ord"; break;
 485   }
 486 }
 487
 488 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
 489                                             const char *Modifier) {
 490   const MachineOperand &BaseReg  = MI->getOperand(Op);
 491   const MachineOperand &IndexReg = MI->getOperand(Op+2);
 492   const MachineOperand &DispSpec = MI->getOperand(Op+3);
 493
 494   // If we really don't want to print out (rip), don't.
 495   bool HasBaseReg = BaseReg.getReg() != 0;
 496   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
 497       BaseReg.getReg() == X86::RIP)
 498     HasBaseReg = false;
 499
 500   // HasParenPart - True if we will print out the () part of the mem ref.
 501   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
 502
 503   if (DispSpec.isImm()) {
 504     int DispVal = DispSpec.getImm();
 505     if (DispVal || !HasParenPart)
 506       O << DispVal;
 507   } else {
 508     assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
 509            DispSpec.isJTI() || DispSpec.isSymbol());
 510     printSymbolOperand(MI->getOperand(Op+3));
 511   }
 512
 513   if (HasParenPart) {
 514     assert(IndexReg.getReg() != X86::ESP &&
 515            "X86 doesn't allow scaling by ESP");
 516
 517     O << '(';
 518     if (HasBaseReg)
 519       printOperand(MI, Op, Modifier);
 520
 521     if (IndexReg.getReg()) {
 522       O << ',';
 523       printOperand(MI, Op+2, Modifier);
 524       unsigned ScaleVal = MI->getOperand(Op+1).getImm();
 525       if (ScaleVal != 1)
 526         O << ',' << ScaleVal;
 527     }
 528     O << ')';
 529   }
 530 }
 531
 532 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
 533                                          const char *Modifier) {
 534   assert(isMem(MI, Op) && "Invalid memory reference!");
 535   const MachineOperand &Segment = MI->getOperand(Op+4);
 536   if (Segment.getReg()) {
 537     printOperand(MI, Op+4, Modifier);
 538     O << ':';
 539   }
 540   printLeaMemReference(MI, Op, Modifier);
 541 }
 542
 543 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
 544                                            const MachineBasicBlock *MBB) const {
 545   if (!MAI->getSetDirective())
 546     return;
 547
 548   // We don't need .set machinery if we have GOT-style relocations
 549   if (Subtarget->isPICStyleGOT())
 550     return;
 551
 552   O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
 553     << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
 554
 555   GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 556
 557   if (Subtarget->isPICStyleRIPRel())
 558     O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 559       << '_' << uid << '\n';
 560   else {
 561     O << '-';
 562     PrintPICBaseSymbol();
 563     O << '\n';
 564   }
 565 }
 566
 567
 568 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
 569   PrintPICBaseSymbol();
 570   O << '\n';
 571   PrintPICBaseSymbol();
 572   O << ':';
 573 }
 574
 575 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
 576                                               const MachineBasicBlock *MBB,
 577                                               unsigned uid) const {
 578   const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
 579     MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
 580
 581   O << JTEntryDirective << ' ';
 582
 583   if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
 584     O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
 585       << '_' << uid << "_set_" << MBB->getNumber();
 586   } else if (Subtarget->isPICStyleGOT()) {
 587     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 588     O << "@GOTOFF";
 589   } else
 590     GetMBBSymbol(MBB->getNumber())->print(O, MAI);
 591 }
 592
 593 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
 594   unsigned Reg = MO.getReg();
 595   switch (Mode) {
 596   default: return true;  // Unknown mode.
 597   case 'b': // Print QImode register
 598     Reg = getX86SubSuperRegister(Reg, MVT::i8);
 599     break;
 600   case 'h': // Print QImode high register
 601     Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
 602     break;
 603   case 'w': // Print HImode register
 604     Reg = getX86SubSuperRegister(Reg, MVT::i16);
 605     break;
 606   case 'k': // Print SImode register
 607     Reg = getX86SubSuperRegister(Reg, MVT::i32);
 608     break;
 609   case 'q': // Print DImode register
 610     Reg = getX86SubSuperRegister(Reg, MVT::i64);
 611     break;
 612   }
 613
 614   O << '%'<< TRI->getAsmName(Reg);
 615   return false;
 616 }
 617
 618 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 619 ///
 620 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 621                                        unsigned AsmVariant,
 622                                        const char *ExtraCode) {
 623   // Does this asm operand have a single letter operand modifier?
 624   if (ExtraCode && ExtraCode[0]) {
 625     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 626
 627     const MachineOperand &MO = MI->getOperand(OpNo);
 628
 629     switch (ExtraCode[0]) {
 630     default: return true;  // Unknown modifier.
 631     case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
 632       if (MO.isImm()) {
 633         O << MO.getImm();
 634         return false;
 635       }
 636       if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
 637         printSymbolOperand(MO);
 638         return false;
 639       }
 640       if (MO.isReg()) {
 641         O << '(';
 642         printOperand(MI, OpNo);
 643         O << ')';
 644         return false;
 645       }
 646       return true;
 647
 648     case 'c': // Don't print "$" before a global var name or constant.
 649       if (MO.isImm())
 650         O << MO.getImm();
 651       else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
 652         printSymbolOperand(MO);
 653       else
 654         printOperand(MI, OpNo);
 655       return false;
 656
 657     case 'A': // Print '*' before a register (it must be a register)
 658       if (MO.isReg()) {
 659         O << '*';
 660         printOperand(MI, OpNo);
 661         return false;
 662       }
 663       return true;
 664
 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 DImode register
 670       if (MO.isReg())
 671         return printAsmMRegister(MO, ExtraCode[0]);
 672       printOperand(MI, OpNo);
 673       return false;
 674
 675     case 'P': // This is the operand of a call, treat specially.
 676       print_pcrel_imm(MI, OpNo);
 677       return false;
 678
 679     case 'n':  // Negate the immediate or print a '-' before the operand.
 680       // Note: this is a temporary solution. It should be handled target
 681       // independently as part of the 'MC' work.
 682       if (MO.isImm()) {
 683         O << -MO.getImm();
 684         return false;
 685       }
 686       O << '-';
 687     }
 688   }
 689
 690   printOperand(MI, OpNo);
 691   return false;
 692 }
 693
 694 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 695                                              unsigned OpNo,
 696                                              unsigned AsmVariant,
 697                                              const char *ExtraCode) {
 698   if (ExtraCode && ExtraCode[0]) {
 699     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 700
 701     switch (ExtraCode[0]) {
 702     default: return true;  // Unknown modifier.
 703     case 'b': // Print QImode register
 704     case 'h': // Print QImode high register
 705     case 'w': // Print HImode register
 706     case 'k': // Print SImode register
 707     case 'q': // Print SImode register
 708       // These only apply to registers, ignore on mem.
 709       break;
 710     case 'P': // Don't print @PLT, but do print as memory.
 711       printMemReference(MI, OpNo, "no-rip");
 712       return false;
 713     }
 714   }
 715   printMemReference(MI, OpNo);
 716   return false;
 717 }
 718
 719
 720
 721 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
 722 /// AT&T syntax to the current output stream.
 723 ///
 724 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 725   ++EmittedInsts;
 726
 727   processDebugLoc(MI->getDebugLoc());
 728
 729   printInstructionThroughMCStreamer(MI);
 730
 731   if (VerboseAsm && !MI->getDebugLoc().isUnknown())
 732     EmitComments(*MI);
 733   O << '\n';
 734 }
 735
 736 void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
 737   const TargetData *TD = TM.getTargetData();
 738
 739   if (!GVar->hasInitializer())
 740     return;   // External global require no code
 741
 742   // Check to see if this is a special global used by LLVM, if so, emit it.
 743   if (EmitSpecialLLVMGlobal(GVar)) {
 744     if (Subtarget->isTargetDarwin() &&
 745         TM.getRelocationModel() == Reloc::Static) {
 746       if (GVar->getName() == "llvm.global_ctors")
 747         O << ".reference .constructors_used\n";
 748       else if (GVar->getName() == "llvm.global_dtors")
 749         O << ".reference .destructors_used\n";
 750     }
 751     return;
 752   }
 753
 754   std::string name = Mang->getMangledName(GVar);
 755   Constant *C = GVar->getInitializer();
 756   const Type *Type = C->getType();
 757   unsigned Size = TD->getTypeAllocSize(Type);
 758   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 759
 760   printVisibility(name, GVar->getVisibility());
 761
 762   if (Subtarget->isTargetELF())
 763     O << "\t.type\t" << name << ",@object\n";
 764
 765
 766   SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
 767   const MCSection *TheSection =
 768     getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
 769   OutStreamer.SwitchSection(TheSection);
 770
 771   // FIXME: get this stuff from section kind flags.
 772   if (C->isNullValue() && !GVar->hasSection() &&
 773       // Don't put things that should go in the cstring section into "comm".
 774       !TheSection->getKind().isMergeableCString()) {
 775     if (GVar->hasExternalLinkage()) {
 776       if (const char *Directive = MAI->getZeroFillDirective()) {
 777         O << "\t.globl " << name << '\n';
 778         O << Directive << "__DATA, __common, " << name << ", "
 779           << Size << ", " << Align << '\n';
 780         return;
 781       }
 782     }
 783
 784     if (!GVar->isThreadLocal() &&
 785         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 786       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 787
 788       if (MAI->getLCOMMDirective() != NULL) {
 789         if (GVar->hasLocalLinkage()) {
 790           O << MAI->getLCOMMDirective() << name << ',' << Size;
 791           if (Subtarget->isTargetDarwin())
 792             O << ',' << Align;
 793         } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
 794           O << "\t.globl " << name << '\n'
 795             << MAI->getWeakDefDirective() << name << '\n';
 796           EmitAlignment(Align, GVar);
 797           O << name << ":";
 798           if (VerboseAsm) {
 799             O.PadToColumn(MAI->getCommentColumn());
 800             O << MAI->getCommentString() << ' ';
 801             WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 802           }
 803           O << '\n';
 804           EmitGlobalConstant(C);
 805           return;
 806         } else {
 807           O << MAI->getCOMMDirective()  << name << ',' << Size;
 808           if (MAI->getCOMMDirectiveTakesAlignment())
 809             O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 810         }
 811       } else {
 812         if (!Subtarget->isTargetCygMing()) {
 813           if (GVar->hasLocalLinkage())
 814             O << "\t.local\t" << name << '\n';
 815         }
 816         O << MAI->getCOMMDirective()  << name << ',' << Size;
 817         if (MAI->getCOMMDirectiveTakesAlignment())
 818           O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
 819       }
 820       if (VerboseAsm) {
 821         O.PadToColumn(MAI->getCommentColumn());
 822         O << MAI->getCommentString() << ' ';
 823         WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 824       }
 825       O << '\n';
 826       return;
 827     }
 828   }
 829
 830   switch (GVar->getLinkage()) {
 831   case GlobalValue::CommonLinkage:
 832   case GlobalValue::LinkOnceAnyLinkage:
 833   case GlobalValue::LinkOnceODRLinkage:
 834   case GlobalValue::WeakAnyLinkage:
 835   case GlobalValue::WeakODRLinkage:
 836   case GlobalValue::LinkerPrivateLinkage:
 837     if (Subtarget->isTargetDarwin()) {
 838       O << "\t.globl " << name << '\n'
 839         << MAI->getWeakDefDirective() << name << '\n';
 840     } else if (Subtarget->isTargetCygMing()) {
 841       O << "\t.globl\t" << name << "\n"
 842            "\t.linkonce same_size\n";
 843     } else {
 844       O << "\t.weak\t" << name << '\n';
 845     }
 846     break;
 847   case GlobalValue::DLLExportLinkage:
 848   case GlobalValue::AppendingLinkage:
 849     // FIXME: appending linkage variables should go into a section of
 850     // their name or something.  For now, just emit them as external.
 851   case GlobalValue::ExternalLinkage:
 852     // If external or appending, declare as a global symbol
 853     O << "\t.globl " << name << '\n';
 854     // FALL THROUGH
 855   case GlobalValue::PrivateLinkage:
 856   case GlobalValue::InternalLinkage:
 857      break;
 858   default:
 859     llvm_unreachable("Unknown linkage type!");
 860   }
 861
 862   EmitAlignment(Align, GVar);
 863   O << name << ":";
 864   if (VerboseAsm){
 865     O.PadToColumn(MAI->getCommentColumn());
 866     O << MAI->getCommentString() << ' ';
 867     WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
 868   }
 869   O << '\n';
 870
 871   EmitGlobalConstant(C);
 872
 873   if (MAI->hasDotTypeDotSizeDirective())
 874     O << "\t.size\t" << name << ", " << Size << '\n';
 875 }
 876
 877 static int SortSymbolPair(const void *LHS, const void *RHS) {
 878   MCSymbol *LHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)LHS)->first;
 879   MCSymbol *RHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)RHS)->first;
 880   return LHSS->getName().compare(RHSS->getName());
 881 }
 882
 883 /// GetSortedStubs - Return the entries from a DenseMap in a deterministic
 884 /// sorted orer.
 885 static std::vector<std::pair<MCSymbol*, MCSymbol*> >
 886 GetSortedStubs(const DenseMap<MCSymbol*, MCSymbol*> &Map) {
 887   assert(!Map.empty());
 888   std::vector<std::pair<MCSymbol*, MCSymbol*> > List(Map.begin(), Map.end());
 889   qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
 890   return List;
 891 }
 892
 893 bool X86ATTAsmPrinter::doFinalization(Module &M) {
 894   // Print out module-level global variables here.
 895   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 896        I != E; ++I) {
 897     if (I->hasDLLExportLinkage())
 898       DLLExportedGVs.insert(Mang->getMangledName(I));
 899   }
 900
 901   if (Subtarget->isTargetDarwin()) {
 902     // All darwin targets use mach-o.
 903     TargetLoweringObjectFileMachO &TLOFMacho =
 904       static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
 905
 906     // Add the (possibly multiple) personalities to the set of global value
 907     // stubs.  Only referenced functions get into the Personalities list.
 908     if (MAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
 909       const std::vector<Function*> &Personalities = MMI->getPersonalities();
 910       for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
 911         if (Personalities[i] == 0)
 912           continue;
 913
 914         SmallString<128> Name;
 915         Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
 916         Name += "$non_lazy_ptr";
 917         MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
 918
 919         MCSymbol *&StubName = GVStubs[NLPName];
 920         if (StubName != 0) continue;
 921
 922
 923         Name.clear();
 924         Mang->getNameWithPrefix(Name, Personalities[i], false);
 925         StubName = OutContext.GetOrCreateSymbol(Name.str());
 926       }
 927     }
 928
 929     // Output stubs for dynamically-linked functions
 930     if (!FnStubs.empty()) {
 931       const MCSection *TheSection =
 932         TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
 933                                   MCSectionMachO::S_SYMBOL_STUBS |
 934                                   MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
 935                                   MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 936                                   5, SectionKind::getMetadata());
 937       OutStreamer.SwitchSection(TheSection);
 938
 939       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 940         = GetSortedStubs(FnStubs);
 941       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 942         Stubs[i].first->print(O, MAI);
 943         O << ":\n" << "\t.indirect_symbol ";
 944         // Get the MCSymbol without the $stub suffix.
 945         Stubs[i].second->print(O, MAI);
 946         O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
 947       }
 948       O << '\n';
 949     }
 950
 951     // Output stubs for external and common global variables.
 952     if (!GVStubs.empty()) {
 953       const MCSection *TheSection =
 954         TLOFMacho.getMachOSection("__IMPORT", "__pointers",
 955                                   MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 956                                   SectionKind::getMetadata());
 957       OutStreamer.SwitchSection(TheSection);
 958
 959       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 960         = GetSortedStubs(GVStubs);
 961       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 962         Stubs[i].first->print(O, MAI);
 963         O << ":\n\t.indirect_symbol ";
 964         Stubs[i].second->print(O, MAI);
 965         O << "\n\t.long\t0\n";
 966       }
 967     }
 968
 969     if (!HiddenGVStubs.empty()) {
 970       OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
 971       EmitAlignment(2);
 972
 973       std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
 974         = GetSortedStubs(HiddenGVStubs);
 975       for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
 976         Stubs[i].first->print(O, MAI);
 977         O << ":\n" << MAI->getData32bitsDirective();
 978         Stubs[i].second->print(O, MAI);
 979         O << '\n';
 980       }
 981     }
 982
 983     // Funny Darwin hack: This flag tells the linker that no global symbols
 984     // contain code that falls through to other global symbols (e.g. the obvious
 985     // implementation of multiple entry points).  If this doesn't occur, the
 986     // linker can safely perform dead code stripping.  Since LLVM never
 987     // generates code that does this, it is always safe to set.
 988     O << "\t.subsections_via_symbols\n";
 989   } else if (Subtarget->isTargetCygMing()) {
 990     // Emit type information for external functions
 991     for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
 992          i != e; ++i) {
 993       O << "\t.def\t " << i->getKeyData()
 994         << ";\t.scl\t" << COFF::C_EXT
 995         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
 996         << ";\t.endef\n";
 997     }
 998   }
 999
1000
1001   // Output linker support code for dllexported globals on windows.
1002   if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
1003     // dllexport symbols only exist on coff targets.
1004     TargetLoweringObjectFileCOFF &TLOFMacho =
1005       static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
1006
1007     OutStreamer.SwitchSection(TLOFMacho.getCOFFSection(".section .drectve",true,
1008                                                  SectionKind::getMetadata()));
1009
1010     for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1011          e = DLLExportedGVs.end(); i != e; ++i)
1012       O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1013
1014     for (StringSet<>::iterator i = DLLExportedFns.begin(),
1015          e = DLLExportedFns.end();
1016          i != e; ++i)
1017       O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1018   }
1019
1020   // Do common shutdown.
1021   return AsmPrinter::doFinalization(M);
1022 }
1023