lib/Target/X86/X86AsmPrinter.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file the shared super class printer that converts from our internal
 // representation of machine-dependent LLVM code to Intel and AT&T format
 // assembly language.
 // This printer is the output mechanism used by `llc'.
 //
 //===----------------------------------------------------------------------===//

 #include "X86AsmPrinter.h"
 #include "X86ATTAsmPrinter.h"
 #include "X86COFF.h"
 #include "X86IntelAsmPrinter.h"
 #include "X86MachineFunctionInfo.h"
 #include "X86Subtarget.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/CallingConv.h"
 #include "llvm/Constants.h"
 #include "llvm/Module.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/ParameterAttributes.h"
 #include "llvm/Type.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;

 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
                                                     const TargetData *TD) {
   X86MachineFunctionInfo Info;
   uint64_t Size = 0;

   switch (F->getCallingConv()) {
   case CallingConv::X86_StdCall:
     Info.setDecorationStyle(StdCall);
     break;
   case CallingConv::X86_FastCall:
     Info.setDecorationStyle(FastCall);
     break;
   default:
     return Info;
   }

   unsigned argNum = 1;
   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
        AI != AE; ++AI, ++argNum) {
     const Type* Ty = AI->getType();

     // 'Dereference' type in case of byval parameter attribute
     if (F->paramHasAttr(argNum, ParamAttr::ByVal))
       Ty = cast<PointerType>(Ty)->getElementType();

     // Size should be aligned to DWORD boundary
     Size += ((TD->getABITypeSize(Ty) + 3)/4)*4;
   }

   // We're not supporting tooooo huge arguments :)
   Info.setBytesToPopOnReturn((unsigned int)Size);
   return Info;
 }


 /// decorateName - Query FunctionInfoMap and use this information for various
 /// name decoration.
 void X86SharedAsmPrinter::decorateName(std::string &Name,
                                        const GlobalValue *GV) {
   const Function *F = dyn_cast<Function>(GV);
   if (!F) return;

   // We don't want to decorate non-stdcall or non-fastcall functions right now
   unsigned CC = F->getCallingConv();
   if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
     return;

   // Decorate names only when we're targeting Cygwin/Mingw32 targets
   if (!Subtarget->isTargetCygMing())
     return;

   FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);

   const X86MachineFunctionInfo *Info;
   if (info_item == FunctionInfoMap.end()) {
     // Calculate apropriate function info and populate map
     FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
     Info = &FunctionInfoMap[F];
   } else {
     Info = &info_item->second;
   }

   const FunctionType *FT = F->getFunctionType();
   switch (Info->getDecorationStyle()) {
   case None:
     break;
   case StdCall:
     // "Pure" variadic functions do not receive @0 suffix.
     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
     break;
   case FastCall:
     // "Pure" variadic functions do not receive @0 suffix.
     if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
         (FT->getNumParams() == 1 && F->hasStructRetAttr()))
       Name += '@' + utostr_32(Info->getBytesToPopOnReturn());

     if (Name[0] == '_') {
       Name[0] = '@';
     } else {
       Name = '@' + Name;
     }
     break;
   default:
     assert(0 && "Unsupported DecorationStyle");
   }
 }

 /// doInitialization
 bool X86SharedAsmPrinter::doInitialization(Module &M) {
   if (TAI->doesSupportDebugInformation()) {
     // Emit initial debug information.
     DW.BeginModule(&M);
   }

   bool Result = AsmPrinter::doInitialization(M);

   // Darwin wants symbols to be quoted if they have complex names.
   if (Subtarget->isTargetDarwin())
     Mang->setUseQuotes(true);

   return Result;
 }

 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
 /// Don't print things like \n or \0.
 static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
        Name != E; ++Name)
     if (isprint(*Name))
       OS << *Name;
 }

 bool X86SharedAsmPrinter::doFinalization(Module &M) {
   // Note: this code is not shared by the Intel printer as it is too different
   // from how MASM does things.  When making changes here don't forget to look
   // at X86IntelAsmPrinter::doFinalization().
   const TargetData *TD = TM.getTargetData();

   // Print out module-level global variables here.
   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (!I->hasInitializer())
       continue;   // External global require no code

     // Check to see if this is a special global used by LLVM, if so, emit it.
     if (EmitSpecialLLVMGlobal(I)) {
       if (Subtarget->isTargetDarwin() &&
           TM.getRelocationModel() == Reloc::Static) {
         if (I->getName() == "llvm.global_ctors")
           O << ".reference .constructors_used\n";
         else if (I->getName() == "llvm.global_dtors")
           O << ".reference .destructors_used\n";
       }
       continue;
     }

     std::string name = Mang->getValueName(I);
     Constant *C = I->getInitializer();
     const Type *Type = C->getType();
     unsigned Size = TD->getABITypeSize(Type);
     unsigned Align = TD->getPreferredAlignmentLog(I);

     if (I->hasHiddenVisibility()) {
       if (const char *Directive = TAI->getHiddenDirective())
         O << Directive << name << "\n";
     } else if (I->hasProtectedVisibility()) {
       if (const char *Directive = TAI->getProtectedDirective())
         O << Directive << name << "\n";
     }

     if (Subtarget->isTargetELF())
       O << "\t.type\t" << name << ",@object\n";

     if (C->isNullValue() && !I->hasSection()) {
       if (I->hasExternalLinkage()) {
         if (const char *Directive = TAI->getZeroFillDirective()) {
           O << "\t.globl " << name << "\n";
           O << Directive << "__DATA, __common, " << name << ", "
             << Size << ", " << Align << "\n";
           continue;
         }
       }

       if (!I->isThreadLocal() &&
           (I->hasInternalLinkage() || I->hasWeakLinkage() ||
            I->hasLinkOnceLinkage())) {
         if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
         if (!NoZerosInBSS && TAI->getBSSSection())
           SwitchToDataSection(TAI->getBSSSection(), I);
         else
           SwitchToDataSection(TAI->getDataSection(), I);
         if (TAI->getLCOMMDirective() != NULL) {
           if (I->hasInternalLinkage()) {
             O << TAI->getLCOMMDirective() << name << "," << Size;
             if (Subtarget->isTargetDarwin())
               O << "," << Align;
           } else {
             O << TAI->getCOMMDirective()  << name << "," << Size;

             // Leopard and above support aligned common symbols.
             if (Subtarget->getDarwinVers() >= 9)
               O << "," << Align;
           }
         } else {
           if (!Subtarget->isTargetCygMing()) {
             if (I->hasInternalLinkage())
               O << "\t.local\t" << name << "\n";
           }
           O << TAI->getCOMMDirective()  << name << "," << Size;
           if (TAI->getCOMMDirectiveTakesAlignment())
             O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
         }
         O << "\t\t" << TAI->getCommentString() << " ";
         PrintUnmangledNameSafely(I, O);
         O << "\n";
         continue;
       }
     }

     switch (I->getLinkage()) {
     case GlobalValue::LinkOnceLinkage:
     case GlobalValue::WeakLinkage:
       if (Subtarget->isTargetDarwin()) {
         O << "\t.globl " << name << "\n"
           << TAI->getWeakDefDirective() << name << "\n";
         SwitchToDataSection("\t.section __DATA,__datacoal_nt,coalesced", I);
       } else if (Subtarget->isTargetCygMing()) {
         std::string SectionName(".section\t.data$linkonce." +
                                 name +
                                 ",\"aw\"");
         SwitchToDataSection(SectionName.c_str(), I);
         O << "\t.globl\t" << name << "\n"
           << "\t.linkonce same_size\n";
       } else {
         std::string SectionName("\t.section\t.llvm.linkonce.d." +
                                 name +
                                 ",\"aw\",@progbits");
         SwitchToDataSection(SectionName.c_str(), I);
         O << "\t.weak\t" << name << "\n";
       }
       break;
     case GlobalValue::DLLExportLinkage:
       DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
       // FALL THROUGH
     case GlobalValue::AppendingLinkage:
       // FIXME: appending linkage variables should go into a section of
       // their name or something.  For now, just emit them as external.
     case GlobalValue::ExternalLinkage:
       // If external or appending, declare as a global symbol
       O << "\t.globl " << name << "\n";
       // FALL THROUGH
     case GlobalValue::InternalLinkage: {
       if (I->isConstant()) {
         const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
         if (TAI->getCStringSection() && CVA && CVA->isCString()) {
           SwitchToDataSection(TAI->getCStringSection(), I);
           break;
         }
       }
       // FIXME: special handling for ".ctors" & ".dtors" sections
       if (I->hasSection() &&
           (I->getSection() == ".ctors" ||
            I->getSection() == ".dtors")) {
         std::string SectionName = ".section " + I->getSection();

         if (Subtarget->isTargetCygMing()) {
           SectionName += ",\"aw\"";
         } else {
           assert(!Subtarget->isTargetDarwin());
           SectionName += ",\"aw\",@progbits";
         }
         SwitchToDataSection(SectionName.c_str());
       } else if (I->hasSection() && Subtarget->isTargetDarwin()) {
         // Honor all section names on Darwin; ObjC uses this
         std::string SectionName = ".section " + I->getSection();
         SwitchToDataSection(SectionName.c_str());
       } else {
         if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
           SwitchToDataSection(I->isThreadLocal() ? TAI->getTLSBSSSection() :
                               TAI->getBSSSection(), I);
         else if (!I->isConstant())
           SwitchToDataSection(I->isThreadLocal() ? TAI->getTLSDataSection() :
                               TAI->getDataSection(), I);
         else if (I->isThreadLocal())
           SwitchToDataSection(TAI->getTLSDataSection());
         else {
           // Read-only data.
           bool HasReloc = C->ContainsRelocations();
           if (HasReloc &&
               Subtarget->isTargetDarwin() &&
               TM.getRelocationModel() != Reloc::Static)
             SwitchToDataSection("\t.const_data\n");
           else if (!HasReloc && Size == 4 &&
                    TAI->getFourByteConstantSection())
             SwitchToDataSection(TAI->getFourByteConstantSection(), I);
           else if (!HasReloc && Size == 8 &&
                    TAI->getEightByteConstantSection())
             SwitchToDataSection(TAI->getEightByteConstantSection(), I);
           else if (!HasReloc && Size == 16 &&
                    TAI->getSixteenByteConstantSection())
             SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
           else if (TAI->getReadOnlySection())
             SwitchToDataSection(TAI->getReadOnlySection(), I);
           else
             SwitchToDataSection(TAI->getDataSection(), I);
         }
       }

       break;
     }
     default:
       assert(0 && "Unknown linkage type!");
     }

     EmitAlignment(Align, I);
     O << name << ":\t\t\t\t" << TAI->getCommentString() << " ";
     PrintUnmangledNameSafely(I, O);
     O << "\n";
     if (TAI->hasDotTypeDotSizeDirective())
       O << "\t.size\t" << name << ", " << Size << "\n";
     // If the initializer is a extern weak symbol, remember to emit the weak
     // reference!
     if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
       if (GV->hasExternalWeakLinkage())
         ExtWeakSymbols.insert(GV);

     EmitGlobalConstant(C);
   }

   // Output linker support code for dllexported globals
   if (!DLLExportedGVs.empty()) {
     SwitchToDataSection(".section .drectve");
   }

   for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
          e = DLLExportedGVs.end();
          i != e; ++i) {
     O << "\t.ascii \" -export:" << *i << ",data\"\n";
   }

   if (!DLLExportedFns.empty()) {
     SwitchToDataSection(".section .drectve");
   }

   for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
          e = DLLExportedFns.end();
          i != e; ++i) {
     O << "\t.ascii \" -export:" << *i << "\"\n";
   }

   if (Subtarget->isTargetDarwin()) {
     SwitchToDataSection("");

     // Output stubs for dynamically-linked functions
     unsigned j = 1;
     for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
          i != e; ++i, ++j) {
       SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
                           "self_modifying_code+pure_instructions,5", 0);
       O << "L" << *i << "$stub:\n";
       O << "\t.indirect_symbol " << *i << "\n";
       O << "\thlt ; hlt ; hlt ; hlt ; hlt\n";
     }

     O << "\n";

     if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
       // Add the (possibly multiple) personalities to the set of global values.
       // Only referenced functions get into the Personalities list.
       const std::vector<Function *>& Personalities = MMI->getPersonalities();

       for (std::vector<Function *>::const_iterator I = Personalities.begin(),
              E = Personalities.end(); I != E; ++I)
         if (*I) GVStubs.insert("_" + (*I)->getName());
     }

     // Output stubs for external and common global variables.
     if (!GVStubs.empty())
       SwitchToDataSection(
                     "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
     for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
          i != e; ++i) {
       O << "L" << *i << "$non_lazy_ptr:\n";
       O << "\t.indirect_symbol " << *i << "\n";
       O << "\t.long\t0\n";
     }

     // Emit final debug information.
     DW.EndModule();

     // 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.
     O << "\t.subsections_via_symbols\n";
   } else if (Subtarget->isTargetCygMing()) {
     // Emit type information for external functions
     for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
          i != e; ++i) {
       O << "\t.def\t " << *i
         << ";\t.scl\t" << COFF::C_EXT
         << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
         << ";\t.endef\n";
     }

     // Emit final debug information.
     DW.EndModule();
   } else if (Subtarget->isTargetELF()) {
     // Emit final debug information.
     DW.EndModule();
   }

   return AsmPrinter::doFinalization(M);
 }

 /// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
 /// for a MachineFunction to the given output stream, using the given target
 /// machine description.
 ///
 FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,
                                              X86TargetMachine &tm) {
   const X86Subtarget *Subtarget = &tm.getSubtarget<X86Subtarget>();

   if (Subtarget->isFlavorIntel()) {
     return new X86IntelAsmPrinter(o, tm, tm.getTargetAsmInfo());
   } else {
     return new X86ATTAsmPrinter(o, tm, tm.getTargetAsmInfo());
   }
 }
	//===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file the shared super class printer that converts from our internal
	// representation of machine-dependent LLVM code to Intel and AT&T format
	// assembly language.
	// This printer is the output mechanism used by `llc'.
	//
	//===----------------------------------------------------------------------===//

	#include "X86AsmPrinter.h"
	#include "X86ATTAsmPrinter.h"
	#include "X86COFF.h"
	#include "X86IntelAsmPrinter.h"
	#include "X86MachineFunctionInfo.h"
	#include "X86Subtarget.h"
	#include "llvm/ADT/StringExtras.h"
	#include "llvm/CallingConv.h"
	#include "llvm/Constants.h"
	#include "llvm/Module.h"
	#include "llvm/DerivedTypes.h"
	#include "llvm/ParameterAttributes.h"
	#include "llvm/Type.h"
	#include "llvm/Assembly/Writer.h"
	#include "llvm/Support/Mangler.h"
	#include "llvm/Target/TargetAsmInfo.h"
	#include "llvm/Target/TargetOptions.h"
	using namespace llvm;

	static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
	const TargetData *TD) {
	X86MachineFunctionInfo Info;
	uint64_t Size = 0;

	switch (F->getCallingConv()) {
	case CallingConv::X86_StdCall:
	Info.setDecorationStyle(StdCall);
	break;
	case CallingConv::X86_FastCall:
	Info.setDecorationStyle(FastCall);
	break;
	default:
	return Info;
	}

	unsigned argNum = 1;
	for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
	AI != AE; ++AI, ++argNum) {
	const Type* Ty = AI->getType();

	// 'Dereference' type in case of byval parameter attribute
	if (F->paramHasAttr(argNum, ParamAttr::ByVal))
	Ty = cast<PointerType>(Ty)->getElementType();

	// Size should be aligned to DWORD boundary
	Size += ((TD->getABITypeSize(Ty) + 3)/4)*4;
	}

	// We're not supporting tooooo huge arguments :)
	Info.setBytesToPopOnReturn((unsigned int)Size);
	return Info;
	}


	/// decorateName - Query FunctionInfoMap and use this information for various
	/// name decoration.
	void X86SharedAsmPrinter::decorateName(std::string &Name,
	const GlobalValue *GV) {
	const Function *F = dyn_cast<Function>(GV);
	if (!F) return;

	// We don't want to decorate non-stdcall or non-fastcall functions right now
	unsigned CC = F->getCallingConv();
	if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
	return;

	// Decorate names only when we're targeting Cygwin/Mingw32 targets
	if (!Subtarget->isTargetCygMing())
	return;

	FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);

	const X86MachineFunctionInfo *Info;
	if (info_item == FunctionInfoMap.end()) {
	// Calculate apropriate function info and populate map
	FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
	Info = &FunctionInfoMap[F];
	} else {
	Info = &info_item->second;
	}

	const FunctionType *FT = F->getFunctionType();
	switch (Info->getDecorationStyle()) {
	case None:
	break;
	case StdCall:
	// "Pure" variadic functions do not receive @0 suffix.
	if (!FT->isVarArg() \|\| (FT->getNumParams() == 0) \|\|
	(FT->getNumParams() == 1 && F->hasStructRetAttr()))
	Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
	break;
	case FastCall:
	// "Pure" variadic functions do not receive @0 suffix.
	if (!FT->isVarArg() \|\| (FT->getNumParams() == 0) \|\|
	(FT->getNumParams() == 1 && F->hasStructRetAttr()))
	Name += '@' + utostr_32(Info->getBytesToPopOnReturn());

	if (Name[0] == '_') {
	Name[0] = '@';
	} else {
	Name = '@' + Name;
	}
	break;
	default:
	assert(0 && "Unsupported DecorationStyle");
	}
	}

	/// doInitialization
	bool X86SharedAsmPrinter::doInitialization(Module &M) {
	if (TAI->doesSupportDebugInformation()) {
	// Emit initial debug information.
	DW.BeginModule(&M);
	}

	bool Result = AsmPrinter::doInitialization(M);

	// Darwin wants symbols to be quoted if they have complex names.
	if (Subtarget->isTargetDarwin())
	Mang->setUseQuotes(true);

	return Result;
	}

	/// PrintUnmangledNameSafely - Print out the printable characters in the name.
	/// Don't print things like \n or \0.
	static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
	for (const char Name = V->getNameStart(), E = Name+V->getNameLen();
	Name != E; ++Name)
	if (isprint(*Name))
	OS << *Name;
	}

	bool X86SharedAsmPrinter::doFinalization(Module &M) {
	// Note: this code is not shared by the Intel printer as it is too different
	// from how MASM does things. When making changes here don't forget to look
	// at X86IntelAsmPrinter::doFinalization().
	const TargetData *TD = TM.getTargetData();

	// Print out module-level global variables here.
	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (!I->hasInitializer())
	continue; // External global require no code

	// Check to see if this is a special global used by LLVM, if so, emit it.
	if (EmitSpecialLLVMGlobal(I)) {
	if (Subtarget->isTargetDarwin() &&
	TM.getRelocationModel() == Reloc::Static) {
	if (I->getName() == "llvm.global_ctors")
	O << ".reference .constructors_used\n";
	else if (I->getName() == "llvm.global_dtors")
	O << ".reference .destructors_used\n";
	}
	continue;
	}

	std::string name = Mang->getValueName(I);
	Constant *C = I->getInitializer();
	const Type *Type = C->getType();
	unsigned Size = TD->getABITypeSize(Type);
	unsigned Align = TD->getPreferredAlignmentLog(I);

	if (I->hasHiddenVisibility()) {
	if (const char *Directive = TAI->getHiddenDirective())
	O << Directive << name << "\n";
	} else if (I->hasProtectedVisibility()) {
	if (const char *Directive = TAI->getProtectedDirective())
	O << Directive << name << "\n";
	}

	if (Subtarget->isTargetELF())
	O << "\t.type\t" << name << ",@object\n";

	if (C->isNullValue() && !I->hasSection()) {
	if (I->hasExternalLinkage()) {
	if (const char *Directive = TAI->getZeroFillDirective()) {
	O << "\t.globl " << name << "\n";
	O << Directive << "__DATA, __common, " << name << ", "
	<< Size << ", " << Align << "\n";
	continue;
	}
	}

	if (!I->isThreadLocal() &&
	(I->hasInternalLinkage() \|\| I->hasWeakLinkage() \|\|
	I->hasLinkOnceLinkage())) {
	if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
	if (!NoZerosInBSS && TAI->getBSSSection())
	SwitchToDataSection(TAI->getBSSSection(), I);
	else
	SwitchToDataSection(TAI->getDataSection(), I);
	if (TAI->getLCOMMDirective() != NULL) {
	if (I->hasInternalLinkage()) {
	O << TAI->getLCOMMDirective() << name << "," << Size;
	if (Subtarget->isTargetDarwin())
	O << "," << Align;
	} else {
	O << TAI->getCOMMDirective() << name << "," << Size;

	// Leopard and above support aligned common symbols.
	if (Subtarget->getDarwinVers() >= 9)
	O << "," << Align;
	}
	} else {
	if (!Subtarget->isTargetCygMing()) {
	if (I->hasInternalLinkage())
	O << "\t.local\t" << name << "\n";
	}
	O << TAI->getCOMMDirective() << name << "," << Size;
	if (TAI->getCOMMDirectiveTakesAlignment())
	O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
	}
	O << "\t\t" << TAI->getCommentString() << " ";
	PrintUnmangledNameSafely(I, O);
	O << "\n";
	continue;
	}
	}

	switch (I->getLinkage()) {
	case GlobalValue::LinkOnceLinkage:
	case GlobalValue::WeakLinkage:
	if (Subtarget->isTargetDarwin()) {
	O << "\t.globl " << name << "\n"
	<< TAI->getWeakDefDirective() << name << "\n";
	SwitchToDataSection("\t.section __DATA,__datacoal_nt,coalesced", I);
	} else if (Subtarget->isTargetCygMing()) {
	std::string SectionName(".section\t.data$linkonce." +
	name +
	",\"aw\"");
	SwitchToDataSection(SectionName.c_str(), I);
	O << "\t.globl\t" << name << "\n"
	<< "\t.linkonce same_size\n";
	} else {
	std::string SectionName("\t.section\t.llvm.linkonce.d." +
	name +
	",\"aw\",@progbits");
	SwitchToDataSection(SectionName.c_str(), I);
	O << "\t.weak\t" << name << "\n";
	}
	break;
	case GlobalValue::DLLExportLinkage:
	DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
	// FALL THROUGH
	case GlobalValue::AppendingLinkage:
	// FIXME: appending linkage variables should go into a section of
	// their name or something. For now, just emit them as external.
	case GlobalValue::ExternalLinkage:
	// If external or appending, declare as a global symbol
	O << "\t.globl " << name << "\n";
	// FALL THROUGH
	case GlobalValue::InternalLinkage: {
	if (I->isConstant()) {
	const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
	if (TAI->getCStringSection() && CVA && CVA->isCString()) {
	SwitchToDataSection(TAI->getCStringSection(), I);
	break;
	}
	}
	// FIXME: special handling for ".ctors" & ".dtors" sections
	if (I->hasSection() &&
	(I->getSection() == ".ctors" \|\|
	I->getSection() == ".dtors")) {
	std::string SectionName = ".section " + I->getSection();

	if (Subtarget->isTargetCygMing()) {
	SectionName += ",\"aw\"";
	} else {
	assert(!Subtarget->isTargetDarwin());
	SectionName += ",\"aw\",@progbits";
	}
	SwitchToDataSection(SectionName.c_str());
	} else if (I->hasSection() && Subtarget->isTargetDarwin()) {
	// Honor all section names on Darwin; ObjC uses this
	std::string SectionName = ".section " + I->getSection();
	SwitchToDataSection(SectionName.c_str());
	} else {
	if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
	SwitchToDataSection(I->isThreadLocal() ? TAI->getTLSBSSSection() :
	TAI->getBSSSection(), I);
	else if (!I->isConstant())
	SwitchToDataSection(I->isThreadLocal() ? TAI->getTLSDataSection() :
	TAI->getDataSection(), I);
	else if (I->isThreadLocal())
	SwitchToDataSection(TAI->getTLSDataSection());
	else {
	// Read-only data.
	bool HasReloc = C->ContainsRelocations();
	if (HasReloc &&
	Subtarget->isTargetDarwin() &&
	TM.getRelocationModel() != Reloc::Static)
	SwitchToDataSection("\t.const_data\n");
	else if (!HasReloc && Size == 4 &&
	TAI->getFourByteConstantSection())
	SwitchToDataSection(TAI->getFourByteConstantSection(), I);
	else if (!HasReloc && Size == 8 &&
	TAI->getEightByteConstantSection())
	SwitchToDataSection(TAI->getEightByteConstantSection(), I);
	else if (!HasReloc && Size == 16 &&
	TAI->getSixteenByteConstantSection())
	SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
	else if (TAI->getReadOnlySection())
	SwitchToDataSection(TAI->getReadOnlySection(), I);
	else
	SwitchToDataSection(TAI->getDataSection(), I);
	}
	}

	break;
	}
	default:
	assert(0 && "Unknown linkage type!");
	}

	EmitAlignment(Align, I);
	O << name << ":\t\t\t\t" << TAI->getCommentString() << " ";
	PrintUnmangledNameSafely(I, O);
	O << "\n";
	if (TAI->hasDotTypeDotSizeDirective())
	O << "\t.size\t" << name << ", " << Size << "\n";
	// If the initializer is a extern weak symbol, remember to emit the weak
	// reference!
	if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
	if (GV->hasExternalWeakLinkage())
	ExtWeakSymbols.insert(GV);

	EmitGlobalConstant(C);
	}

	// Output linker support code for dllexported globals
	if (!DLLExportedGVs.empty()) {
	SwitchToDataSection(".section .drectve");
	}

	for (std::set<std::string>::iterator i = DLLExportedGVs.begin(),
	e = DLLExportedGVs.end();
	i != e; ++i) {
	O << "\t.ascii \" -export:" << *i << ",data\"\n";
	}

	if (!DLLExportedFns.empty()) {
	SwitchToDataSection(".section .drectve");
	}

	for (std::set<std::string>::iterator i = DLLExportedFns.begin(),
	e = DLLExportedFns.end();
	i != e; ++i) {
	O << "\t.ascii \" -export:" << *i << "\"\n";
	}

	if (Subtarget->isTargetDarwin()) {
	SwitchToDataSection("");

	// Output stubs for dynamically-linked functions
	unsigned j = 1;
	for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
	i != e; ++i, ++j) {
	SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
	"self_modifying_code+pure_instructions,5", 0);
	O << "L" << *i << "$stub:\n";
	O << "\t.indirect_symbol " << *i << "\n";
	O << "\thlt ; hlt ; hlt ; hlt ; hlt\n";
	}

	O << "\n";

	if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
	// Add the (possibly multiple) personalities to the set of global values.
	// Only referenced functions get into the Personalities list.
	const std::vector<Function *>& Personalities = MMI->getPersonalities();

	for (std::vector<Function *>::const_iterator I = Personalities.begin(),
	E = Personalities.end(); I != E; ++I)
	if (I) GVStubs.insert("_" + (I)->getName());
	}

	// Output stubs for external and common global variables.
	if (!GVStubs.empty())
	SwitchToDataSection(
	"\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
	for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
	i != e; ++i) {
	O << "L" << *i << "$non_lazy_ptr:\n";
	O << "\t.indirect_symbol " << *i << "\n";
	O << "\t.long\t0\n";
	}

	// Emit final debug information.
	DW.EndModule();

	// 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.
	O << "\t.subsections_via_symbols\n";
	} else if (Subtarget->isTargetCygMing()) {
	// Emit type information for external functions
	for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
	i != e; ++i) {
	O << "\t.def\t " << *i
	<< ";\t.scl\t" << COFF::C_EXT
	<< ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
	<< ";\t.endef\n";
	}

	// Emit final debug information.
	DW.EndModule();
	} else if (Subtarget->isTargetELF()) {
	// Emit final debug information.
	DW.EndModule();
	}

	return AsmPrinter::doFinalization(M);
	}

	/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
	/// for a MachineFunction to the given output stream, using the given target
	/// machine description.
	///
	FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,
	X86TargetMachine &tm) {
	const X86Subtarget *Subtarget = &tm.getSubtarget<X86Subtarget>();

	if (Subtarget->isFlavorIntel()) {
	return new X86IntelAsmPrinter(o, tm, tm.getTargetAsmInfo());
	} else {
	return new X86ATTAsmPrinter(o, tm, tm.getTargetAsmInfo());
	}
	}