Check in LLVM r95781.

1 files changed, 635 insertions, 0 deletions

diff --git a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
new file mode 100644
index 0000000000..304306d592
--- /dev/null
+++ b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
@@ -0,0 +1,635 @@
+//===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to X86 machine code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86AsmPrinter.h"
+#include "X86ATTInstPrinter.h"
+#include "X86IntelInstPrinter.h"
+#include "X86MCInstLower.h"
+#include "X86.h"
+#include "X86COFF.h"
+#include "X86COFFMachineModuleInfo.h"
+#include "X86MachineFunctionInfo.h"
+#include "X86TargetMachine.h"
+#include "llvm/CallingConv.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/Type.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/ADT/SmallString.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// Primitive Helper Functions.
+//===----------------------------------------------------------------------===//
+
+void X86AsmPrinter::PrintPICBaseSymbol() const {
+  const TargetLowering *TLI = TM.getTargetLowering();
+  O << *static_cast<const X86TargetLowering*>(TLI)->getPICBaseSymbol(MF,
+                                                                    OutContext);
+}
+
+/// runOnMachineFunction - Emit the function body.
+///
+bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  SetupMachineFunction(MF);
+  
+  // COFF and Cygwin specific mangling stuff.  This should be moved out to the
+  // mangler or handled some other way?
+  if (Subtarget->isTargetCOFF()) {
+    X86COFFMachineModuleInfo &COFFMMI = 
+      MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
+
+    // Populate function information map.  Don't want to populate
+    // non-stdcall or non-fastcall functions' information right now.
+    const Function *F = MF.getFunction();
+    CallingConv::ID CC = F->getCallingConv();
+    if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
+      COFFMMI.AddFunctionInfo(F, *MF.getInfo<X86MachineFunctionInfo>());
+  }
+  if (Subtarget->isTargetCygMing()) {
+    const Function *F = MF.getFunction();
+    X86COFFMachineModuleInfo &COFFMMI = 
+      MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
+    COFFMMI.DecorateCygMingName(CurrentFnSym, OutContext,F,*TM.getTargetData());
+    
+    O << "\t.def\t " << *CurrentFnSym;
+    O << ";\t.scl\t" <<
+    (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
+    << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
+    << ";\t.endef\n";
+  }
+  
+  // Have common code print out the function header with linkage info etc.
+  EmitFunctionHeader();
+  
+  // Emit the rest of the function body.
+  EmitFunctionBody();
+
+  // We didn't modify anything.
+  return false;
+}
+
+/// printSymbolOperand - Print a raw symbol reference operand.  This handles
+/// jump tables, constant pools, global address and external symbols, all of
+/// which print to a label with various suffixes for relocation types etc.
+void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO) {
+  switch (MO.getType()) {
+  default: llvm_unreachable("unknown symbol type!");
+  case MachineOperand::MO_JumpTableIndex:
+    O << *GetJTISymbol(MO.getIndex());
+    break;
+  case MachineOperand::MO_ConstantPoolIndex:
+    O << *GetCPISymbol(MO.getIndex());
+    printOffset(MO.getOffset());
+    break;
+  case MachineOperand::MO_GlobalAddress: {
+    const GlobalValue *GV = MO.getGlobal();
+    
+    MCSymbol *GVSym;
+    if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
+      GVSym = GetSymbolWithGlobalValueBase(GV, "$stub");
+    else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
+             MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
+             MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
+      GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
+    else
+      GVSym = GetGlobalValueSymbol(GV);
+
+    if (Subtarget->isTargetCygMing()) {
+      X86COFFMachineModuleInfo &COFFMMI =
+        MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
+      COFFMMI.DecorateCygMingName(GVSym, OutContext, GV, *TM.getTargetData());
+    }
+    
+    // Handle dllimport linkage.
+    if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
+      GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
+    
+    if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
+        MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
+      MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
+      
+      MCSymbol *&StubSym = 
+        MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
+      if (StubSym == 0)
+        StubSym = GetGlobalValueSymbol(GV);
+      
+    } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
+      MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
+      MCSymbol *&StubSym =
+        MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
+      if (StubSym == 0)
+        StubSym = GetGlobalValueSymbol(GV);
+    } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
+      MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
+      MCSymbol *&StubSym =
+        MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
+      if (StubSym == 0)
+        StubSym = GetGlobalValueSymbol(GV);
+    }
+    
+    // If the name begins with a dollar-sign, enclose it in parens.  We do this
+    // to avoid having it look like an integer immediate to the assembler.
+    if (GVSym->getName()[0] != '$')
+      O << *GVSym;
+    else
+      O << '(' << *GVSym << ')';
+    printOffset(MO.getOffset());
+    break;
+  }
+  case MachineOperand::MO_ExternalSymbol: {
+    const MCSymbol *SymToPrint;
+    if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
+      SmallString<128> TempNameStr;
+      TempNameStr += StringRef(MO.getSymbolName());
+      TempNameStr += StringRef("$stub");
+      
+      MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
+      MCSymbol *&StubSym =
+        MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
+      if (StubSym == 0) {
+        TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
+        StubSym = OutContext.GetOrCreateSymbol(TempNameStr.str());
+      }
+      SymToPrint = StubSym;
+    } else {
+      SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName());
+    }
+    
+    // If the name begins with a dollar-sign, enclose it in parens.  We do this
+    // to avoid having it look like an integer immediate to the assembler.
+    if (SymToPrint->getName()[0] != '$') 
+      O << *SymToPrint;
+    else
+      O << '(' << *SymToPrint << '(';
+    break;
+  }
+  }
+  
+  switch (MO.getTargetFlags()) {
+  default:
+    llvm_unreachable("Unknown target flag on GV operand");
+  case X86II::MO_NO_FLAG:    // No flag.
+    break;
+  case X86II::MO_DARWIN_NONLAZY:
+  case X86II::MO_DLLIMPORT:
+  case X86II::MO_DARWIN_STUB:
+    // These affect the name of the symbol, not any suffix.
+    break;
+  case X86II::MO_GOT_ABSOLUTE_ADDRESS:
+    O << " + [.-";
+    PrintPICBaseSymbol();
+    O << ']';
+    break;      
+  case X86II::MO_PIC_BASE_OFFSET:
+  case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
+  case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
+    O << '-';
+    PrintPICBaseSymbol();
+    break;
+  case X86II::MO_TLSGD:     O << "@TLSGD";     break;
+  case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
+  case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
+  case X86II::MO_TPOFF:     O << "@TPOFF";     break;
+  case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
+  case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
+  case X86II::MO_GOT:       O << "@GOT";       break;
+  case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
+  case X86II::MO_PLT:       O << "@PLT";       break;
+  }
+}
+
+/// print_pcrel_imm - This is used to print an immediate value that ends up
+/// being encoded as a pc-relative value.  These print slightly differently, for
+/// example, a $ is not emitted.
+void X86AsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
+  const MachineOperand &MO = MI->getOperand(OpNo);
+  switch (MO.getType()) {
+  default: llvm_unreachable("Unknown pcrel immediate operand");
+  case MachineOperand::MO_Immediate:
+    O << MO.getImm();
+    return;
+  case MachineOperand::MO_MachineBasicBlock:
+    O << *MO.getMBB()->getSymbol(OutContext);
+    return;
+  case MachineOperand::MO_GlobalAddress:
+  case MachineOperand::MO_ExternalSymbol:
+    printSymbolOperand(MO);
+    return;
+  }
+}
+
+
+void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
+                                 const char *Modifier) {
+  const MachineOperand &MO = MI->getOperand(OpNo);
+  switch (MO.getType()) {
+  default: llvm_unreachable("unknown operand type!");
+  case MachineOperand::MO_Register: {
+    O << '%';
+    unsigned Reg = MO.getReg();
+    if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
+      EVT VT = (strcmp(Modifier+6,"64") == 0) ?
+        MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
+                    ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
+      Reg = getX86SubSuperRegister(Reg, VT);
+    }
+    O << X86ATTInstPrinter::getRegisterName(Reg);
+    return;
+  }
+
+  case MachineOperand::MO_Immediate:
+    O << '$' << MO.getImm();
+    return;
+
+  case MachineOperand::MO_JumpTableIndex:
+  case MachineOperand::MO_ConstantPoolIndex:
+  case MachineOperand::MO_GlobalAddress: 
+  case MachineOperand::MO_ExternalSymbol: {
+    O << '$';
+    printSymbolOperand(MO);
+    break;
+  }
+  }
+}
+
+void X86AsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
+  unsigned char value = MI->getOperand(Op).getImm();
+  assert(value <= 7 && "Invalid ssecc argument!");
+  switch (value) {
+  case 0: O << "eq"; break;
+  case 1: O << "lt"; break;
+  case 2: O << "le"; break;
+  case 3: O << "unord"; break;
+  case 4: O << "neq"; break;
+  case 5: O << "nlt"; break;
+  case 6: O << "nle"; break;
+  case 7: O << "ord"; break;
+  }
+}
+
+void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
+                                         const char *Modifier) {
+  const MachineOperand &BaseReg  = MI->getOperand(Op);
+  const MachineOperand &IndexReg = MI->getOperand(Op+2);
+  const MachineOperand &DispSpec = MI->getOperand(Op+3);
+
+  // If we really don't want to print out (rip), don't.
+  bool HasBaseReg = BaseReg.getReg() != 0;
+  if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
+      BaseReg.getReg() == X86::RIP)
+    HasBaseReg = false;
+  
+  // HasParenPart - True if we will print out the () part of the mem ref.
+  bool HasParenPart = IndexReg.getReg() || HasBaseReg;
+  
+  if (DispSpec.isImm()) {
+    int DispVal = DispSpec.getImm();
+    if (DispVal || !HasParenPart)
+      O << DispVal;
+  } else {
+    assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
+           DispSpec.isJTI() || DispSpec.isSymbol());
+    printSymbolOperand(MI->getOperand(Op+3));
+  }
+
+  if (HasParenPart) {
+    assert(IndexReg.getReg() != X86::ESP &&
+           "X86 doesn't allow scaling by ESP");
+
+    O << '(';
+    if (HasBaseReg)
+      printOperand(MI, Op, Modifier);
+
+    if (IndexReg.getReg()) {
+      O << ',';
+      printOperand(MI, Op+2, Modifier);
+      unsigned ScaleVal = MI->getOperand(Op+1).getImm();
+      if (ScaleVal != 1)
+        O << ',' << ScaleVal;
+    }
+    O << ')';
+  }
+}
+
+void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
+                                      const char *Modifier) {
+  assert(isMem(MI, Op) && "Invalid memory reference!");
+  const MachineOperand &Segment = MI->getOperand(Op+4);
+  if (Segment.getReg()) {
+    printOperand(MI, Op+4, Modifier);
+    O << ':';
+  }
+  printLeaMemReference(MI, Op, Modifier);
+}
+
+void X86AsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
+  PrintPICBaseSymbol();
+  O << '\n';
+  PrintPICBaseSymbol();
+  O << ':';
+}
+
+bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
+  unsigned Reg = MO.getReg();
+  switch (Mode) {
+  default: return true;  // Unknown mode.
+  case 'b': // Print QImode register
+    Reg = getX86SubSuperRegister(Reg, MVT::i8);
+    break;
+  case 'h': // Print QImode high register
+    Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
+    break;
+  case 'w': // Print HImode register
+    Reg = getX86SubSuperRegister(Reg, MVT::i16);
+    break;
+  case 'k': // Print SImode register
+    Reg = getX86SubSuperRegister(Reg, MVT::i32);
+    break;
+  case 'q': // Print DImode register
+    Reg = getX86SubSuperRegister(Reg, MVT::i64);
+    break;
+  }
+
+  O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
+  return false;
+}
+
+/// PrintAsmOperand - Print out an operand for an inline asm expression.
+///
+bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                                    unsigned AsmVariant,
+                                    const char *ExtraCode) {
+  // Does this asm operand have a single letter operand modifier?
+  if (ExtraCode && ExtraCode[0]) {
+    if (ExtraCode[1] != 0) return true; // Unknown modifier.
+
+    const MachineOperand &MO = MI->getOperand(OpNo);
+    
+    switch (ExtraCode[0]) {
+    default: return true;  // Unknown modifier.
+    case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
+      if (MO.isImm()) {
+        O << MO.getImm();
+        return false;
+      } 
+      if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
+        printSymbolOperand(MO);
+        return false;
+      }
+      if (MO.isReg()) {
+        O << '(';
+        printOperand(MI, OpNo);
+        O << ')';
+        return false;
+      }
+      return true;
+
+    case 'c': // Don't print "$" before a global var name or constant.
+      if (MO.isImm())
+        O << MO.getImm();
+      else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
+        printSymbolOperand(MO);
+      else
+        printOperand(MI, OpNo);
+      return false;
+
+    case 'A': // Print '*' before a register (it must be a register)
+      if (MO.isReg()) {
+        O << '*';
+        printOperand(MI, OpNo);
+        return false;
+      }
+      return true;
+
+    case 'b': // Print QImode register
+    case 'h': // Print QImode high register
+    case 'w': // Print HImode register
+    case 'k': // Print SImode register
+    case 'q': // Print DImode register
+      if (MO.isReg())
+        return printAsmMRegister(MO, ExtraCode[0]);
+      printOperand(MI, OpNo);
+      return false;
+
+    case 'P': // This is the operand of a call, treat specially.
+      print_pcrel_imm(MI, OpNo);
+      return false;
+
+    case 'n':  // Negate the immediate or print a '-' before the operand.
+      // Note: this is a temporary solution. It should be handled target
+      // independently as part of the 'MC' work.
+      if (MO.isImm()) {
+        O << -MO.getImm();
+        return false;
+      }
+      O << '-';
+    }
+  }
+
+  printOperand(MI, OpNo);
+  return false;
+}
+
+bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
+                                          unsigned OpNo, unsigned AsmVariant,
+                                          const char *ExtraCode) {
+  if (ExtraCode && ExtraCode[0]) {
+    if (ExtraCode[1] != 0) return true; // Unknown modifier.
+
+    switch (ExtraCode[0]) {
+    default: return true;  // Unknown modifier.
+    case 'b': // Print QImode register
+    case 'h': // Print QImode high register
+    case 'w': // Print HImode register
+    case 'k': // Print SImode register
+    case 'q': // Print SImode register
+      // These only apply to registers, ignore on mem.
+      break;
+    case 'P': // Don't print @PLT, but do print as memory.
+      printMemReference(MI, OpNo, "no-rip");
+      return false;
+    }
+  }
+  printMemReference(MI, OpNo);
+  return false;
+}
+
+
+void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
+  if (Subtarget->isTargetDarwin()) {
+    // All darwin targets use mach-o.
+    TargetLoweringObjectFileMachO &TLOFMacho = 
+      static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
+    
+    MachineModuleInfoMachO &MMIMacho =
+      MMI->getObjFileInfo<MachineModuleInfoMachO>();
+    
+    // Output stubs for dynamically-linked functions.
+    MachineModuleInfoMachO::SymbolListTy Stubs;
+
+    Stubs = MMIMacho.GetFnStubList();
+    if (!Stubs.empty()) {
+      const MCSection *TheSection = 
+        TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
+                                  MCSectionMachO::S_SYMBOL_STUBS |
+                                  MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
+                                  MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+                                  5, SectionKind::getMetadata());
+      OutStreamer.SwitchSection(TheSection);
+
+      for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
+        // L_foo$stub:
+        OutStreamer.EmitLabel(Stubs[i].first);
+        //   .indirect_symbol _foo
+        OutStreamer.EmitSymbolAttribute(Stubs[i].second, MCSA_IndirectSymbol);
+        // hlt; hlt; hlt; hlt; hlt     hlt = 0xf4 = -12.
+        const char HltInsts[] = { -12, -12, -12, -12, -12 };
+        OutStreamer.EmitBytes(StringRef(HltInsts, 5), 0/*addrspace*/);
+      }
+      
+      Stubs.clear();
+      OutStreamer.AddBlankLine();
+    }
+
+    // Output stubs for external and common global variables.
+    Stubs = MMIMacho.GetGVStubList();
+    if (!Stubs.empty()) {
+      const MCSection *TheSection = 
+        TLOFMacho.getMachOSection("__IMPORT", "__pointers",
+                                  MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
+                                  SectionKind::getMetadata());
+      OutStreamer.SwitchSection(TheSection);
+
+      for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
+        // L_foo$non_lazy_ptr:
+        OutStreamer.EmitLabel(Stubs[i].first);
+        // .indirect_symbol _foo
+        OutStreamer.EmitSymbolAttribute(Stubs[i].second, MCSA_IndirectSymbol);
+        // .long 0
+        OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
+      }
+      Stubs.clear();
+      OutStreamer.AddBlankLine();
+    }
+
+    Stubs = MMIMacho.GetHiddenGVStubList();
+    if (!Stubs.empty()) {
+      OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
+      EmitAlignment(2);
+
+      for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
+        // L_foo$non_lazy_ptr:
+        OutStreamer.EmitLabel(Stubs[i].first);
+        // .long _foo
+        OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second,
+                                                      OutContext),
+                              4/*size*/, 0/*addrspace*/);
+      }
+      Stubs.clear();
+      OutStreamer.AddBlankLine();
+    }
+
+    // Funny Darwin hack: This flag tells the linker that no global symbols
+    // contain code that falls through to other global symbols (e.g. the obvious
+    // implementation of multiple entry points).  If this doesn't occur, the
+    // linker can safely perform dead code stripping.  Since LLVM never
+    // generates code that does this, it is always safe to set.
+    OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
+  }
+
+  if (Subtarget->isTargetCOFF()) {
+    X86COFFMachineModuleInfo &COFFMMI =
+      MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
+
+    // Emit type information for external functions
+    for (X86COFFMachineModuleInfo::stub_iterator I = COFFMMI.stub_begin(),
+           E = COFFMMI.stub_end(); I != E; ++I) {
+      O << "\t.def\t " << I->getKeyData()
+        << ";\t.scl\t" << COFF::C_EXT
+        << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
+        << ";\t.endef\n";
+    }
+
+    if (Subtarget->isTargetCygMing()) {
+      // Necessary for dllexport support
+      std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
+
+      TargetLoweringObjectFileCOFF &TLOFCOFF =
+        static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
+
+      for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
+        if (I->hasDLLExportLinkage()) {
+          MCSymbol *Sym = GetGlobalValueSymbol(I);
+          COFFMMI.DecorateCygMingName(Sym, OutContext, I, *TM.getTargetData());
+          DLLExportedFns.push_back(Sym);
+        }
+
+      for (Module::const_global_iterator I = M.global_begin(),
+             E = M.global_end(); I != E; ++I)
+        if (I->hasDLLExportLinkage())
+          DLLExportedGlobals.push_back(GetGlobalValueSymbol(I));
+
+      // Output linker support code for dllexported globals on windows.
+      if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
+        OutStreamer.SwitchSection(TLOFCOFF.getCOFFSection(".section .drectve",
+                                                          true,
+                                                   SectionKind::getMetadata()));
+        for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i)
+          O << "\t.ascii \" -export:" << *DLLExportedGlobals[i] << ",data\"\n";
+
+        for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i)
+          O << "\t.ascii \" -export:" << *DLLExportedFns[i] << "\"\n";
+      }
+    }
+  }
+}
+
+
+//===----------------------------------------------------------------------===//
+// Target Registry Stuff
+//===----------------------------------------------------------------------===//
+
+static MCInstPrinter *createX86MCInstPrinter(const Target &T,
+                                             unsigned SyntaxVariant,
+                                             const MCAsmInfo &MAI,
+                                             raw_ostream &O) {
+  if (SyntaxVariant == 0)
+    return new X86ATTInstPrinter(O, MAI);
+  if (SyntaxVariant == 1)
+    return new X86IntelInstPrinter(O, MAI);
+  return 0;
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeX86AsmPrinter() { 
+  RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
+  RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
+  
+  TargetRegistry::RegisterMCInstPrinter(TheX86_32Target,createX86MCInstPrinter);
+  TargetRegistry::RegisterMCInstPrinter(TheX86_64Target,createX86MCInstPrinter);
+}