Move all assembler printing related stuff into new libAsmPrinter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54885 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1509 insertions, 0 deletions

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
new file mode 100644
index 0000000000..4d16c7b0f1
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -0,0 +1,1509 @@
+//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AsmPrinter class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/GCStrategy.h"
+#include "llvm/CodeGen/GCMetadata.h"
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
+#include <cerrno>
+using namespace llvm;
+
+char AsmPrinter::ID = 0;
+AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
+                       const TargetAsmInfo *T)
+  : MachineFunctionPass((intptr_t)&ID), FunctionNumber(0), O(o),
+    TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
+    IsInTextSection(false)
+{}
+
+AsmPrinter::~AsmPrinter() {
+  for (gcp_iterator I = GCMetadataPrinters.begin(),
+                    E = GCMetadataPrinters.end(); I != E; ++I)
+    delete I->second;
+}
+    
+std::string AsmPrinter::getSectionForFunction(const Function &F) const {
+  return TAI->getTextSection();
+}
+
+
+/// SwitchToTextSection - Switch to the specified text section of the executable
+/// if we are not already in it!
+///
+void AsmPrinter::SwitchToTextSection(const char *NewSection,
+                                     const GlobalValue *GV) {
+  std::string NS;
+  if (GV && GV->hasSection())
+    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
+  else
+    NS = NewSection;
+  
+  // If we're already in this section, we're done.
+  if (CurrentSection == NS) return;
+
+  // Close the current section, if applicable.
+  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
+    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
+
+  CurrentSection = NS;
+
+  if (!CurrentSection.empty())
+    O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
+
+  IsInTextSection = true;
+}
+
+/// SwitchToDataSection - Switch to the specified data section of the executable
+/// if we are not already in it!
+///
+void AsmPrinter::SwitchToDataSection(const char *NewSection,
+                                     const GlobalValue *GV) {
+  std::string NS;
+  if (GV && GV->hasSection())
+    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
+  else
+    NS = NewSection;
+  
+  // If we're already in this section, we're done.
+  if (CurrentSection == NS) return;
+
+  // Close the current section, if applicable.
+  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
+    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
+
+  CurrentSection = NS;
+  
+  if (!CurrentSection.empty())
+    O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
+
+  IsInTextSection = false;
+}
+
+
+void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
+  MachineFunctionPass::getAnalysisUsage(AU);
+  AU.addRequired<CollectorModuleMetadata>();
+}
+
+bool AsmPrinter::doInitialization(Module &M) {
+  Mang = new Mangler(M, TAI->getGlobalPrefix());
+  
+  CollectorModuleMetadata *CMM = getAnalysisToUpdate<CollectorModuleMetadata>();
+  assert(CMM && "AsmPrinter didn't require CollectorModuleMetadata?");
+  for (CollectorModuleMetadata::iterator I = CMM->begin(),
+                                         E = CMM->end(); I != E; ++I)
+    if (GCMetadataPrinter *GCP = GetOrCreateGCPrinter(*I))
+      GCP->beginAssembly(O, *this, *TAI);
+<<<<<<< HEAD:lib/CodeGen/AsmPrinter.cpp
+=======
+
+>>>>>>> Factor out asmprinters from collector interface.:lib/CodeGen/AsmPrinter.cpp
+  
+  if (!M.getModuleInlineAsm().empty())
+    O << TAI->getCommentString() << " Start of file scope inline assembly\n"
+      << M.getModuleInlineAsm()
+      << '\n' << TAI->getCommentString()
+      << " End of file scope inline assembly\n";
+
+  SwitchToDataSection("");   // Reset back to no section.
+  
+  MMI = getAnalysisToUpdate<MachineModuleInfo>();
+  if (MMI) MMI->AnalyzeModule(M);
+  
+  return false;
+}
+
+bool AsmPrinter::doFinalization(Module &M) {
+  if (TAI->getWeakRefDirective()) {
+    if (!ExtWeakSymbols.empty())
+      SwitchToDataSection("");
+
+    for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
+         e = ExtWeakSymbols.end(); i != e; ++i) {
+      const GlobalValue *GV = *i;
+      std::string Name = Mang->getValueName(GV);
+      O << TAI->getWeakRefDirective() << Name << '\n';
+    }
+  }
+
+  if (TAI->getSetDirective()) {
+    if (!M.alias_empty())
+      SwitchToTextSection(TAI->getTextSection());
+
+    O << '\n';
+    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
+         I!=E; ++I) {
+      std::string Name = Mang->getValueName(I);
+      std::string Target;
+
+      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
+      Target = Mang->getValueName(GV);
+      
+      if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
+        O << "\t.globl\t" << Name << '\n';
+      else if (I->hasWeakLinkage())
+        O << TAI->getWeakRefDirective() << Name << '\n';
+      else if (!I->hasInternalLinkage())
+        assert(0 && "Invalid alias linkage");
+
+      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';
+      }
+
+      O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
+
+      // If the aliasee has external weak linkage it can be referenced only by
+      // alias itself. In this case it can be not in ExtWeakSymbols list. Emit
+      // weak reference in such case.
+      if (GV->hasExternalWeakLinkage()) {
+        if (TAI->getWeakRefDirective())
+          O << TAI->getWeakRefDirective() << Target << '\n';
+        else
+          O << "\t.globl\t" << Target << '\n';
+      }
+    }
+  }
+
+  CollectorModuleMetadata *CMM = getAnalysisToUpdate<CollectorModuleMetadata>();
+  assert(CMM && "AsmPrinter didn't require CollectorModuleMetadata?");
+  for (CollectorModuleMetadata::iterator I = CMM->end(),
+                                         E = CMM->begin(); I != E; )
+    if (GCMetadataPrinter *GCP = GetOrCreateGCPrinter(*--I))
+      GCP->finishAssembly(O, *this, *TAI);
+
+  // If we don't have any trampolines, then we don't require stack memory
+  // to be executable. Some targets have a directive to declare this.
+  Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
+  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
+    if (TAI->getNonexecutableStackDirective())
+      O << TAI->getNonexecutableStackDirective() << '\n';
+
+  delete Mang; Mang = 0;
+  return false;
+}
+
+std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) {
+  assert(MF && "No machine function?");
+  std::string Name = MF->getFunction()->getName();
+  if (Name.empty())
+    Name = Mang->getValueName(MF->getFunction());
+  return Mang->makeNameProper(Name + ".eh", TAI->getGlobalPrefix());
+}
+
+void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
+  // What's my mangled name?
+  CurrentFnName = Mang->getValueName(MF.getFunction());
+  IncrementFunctionNumber();
+}
+
+/// EmitConstantPool - Print to the current output stream assembly
+/// representations of the constants in the constant pool MCP. This is
+/// used to print out constants which have been "spilled to memory" by
+/// the code generator.
+///
+void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
+  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
+  if (CP.empty()) return;
+
+  // Some targets require 4-, 8-, and 16- byte constant literals to be placed
+  // in special sections.
+  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
+  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
+  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
+  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
+  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
+  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+    MachineConstantPoolEntry CPE = CP[i];
+    const Type *Ty = CPE.getType();
+    if (TAI->getFourByteConstantSection() &&
+        TM.getTargetData()->getABITypeSize(Ty) == 4)
+      FourByteCPs.push_back(std::make_pair(CPE, i));
+    else if (TAI->getEightByteConstantSection() &&
+             TM.getTargetData()->getABITypeSize(Ty) == 8)
+      EightByteCPs.push_back(std::make_pair(CPE, i));
+    else if (TAI->getSixteenByteConstantSection() &&
+             TM.getTargetData()->getABITypeSize(Ty) == 16)
+      SixteenByteCPs.push_back(std::make_pair(CPE, i));
+    else
+      OtherCPs.push_back(std::make_pair(CPE, i));
+  }
+
+  unsigned Alignment = MCP->getConstantPoolAlignment();
+  EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
+  EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
+  EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
+                   SixteenByteCPs);
+  EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
+}
+
+void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
+               std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
+  if (CP.empty()) return;
+
+  SwitchToDataSection(Section);
+  EmitAlignment(Alignment);
+  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
+      << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << ' ';
+    WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
+    if (CP[i].first.isMachineConstantPoolEntry())
+      EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
+     else
+      EmitGlobalConstant(CP[i].first.Val.ConstVal);
+    if (i != e-1) {
+      const Type *Ty = CP[i].first.getType();
+      unsigned EntSize =
+        TM.getTargetData()->getABITypeSize(Ty);
+      unsigned ValEnd = CP[i].first.getOffset() + EntSize;
+      // Emit inter-object padding for alignment.
+      EmitZeros(CP[i+1].first.getOffset()-ValEnd);
+    }
+  }
+}
+
+/// EmitJumpTableInfo - Print assembly representations of the jump tables used
+/// by the current function to the current output stream.  
+///
+void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
+                                   MachineFunction &MF) {
+  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+  if (JT.empty()) return;
+
+  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
+  
+  // Pick the directive to use to print the jump table entries, and switch to 
+  // the appropriate section.
+  TargetLowering *LoweringInfo = TM.getTargetLowering();
+
+  const char* JumpTableDataSection = TAI->getJumpTableDataSection();
+  const Function *F = MF.getFunction();
+  unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
+  if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
+     !JumpTableDataSection ||
+      SectionFlags & SectionFlags::Linkonce) {
+    // In PIC mode, we need to emit the jump table to the same section as the
+    // function body itself, otherwise the label differences won't make sense.
+    // We should also do if the section name is NULL or function is declared in
+    // discardable section.
+    SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
+  } else {
+    SwitchToDataSection(JumpTableDataSection);
+  }
+  
+  EmitAlignment(Log2_32(MJTI->getAlignment()));
+  
+  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
+    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
+    
+    // If this jump table was deleted, ignore it. 
+    if (JTBBs.empty()) continue;
+
+    // For PIC codegen, if possible we want to use the SetDirective to reduce
+    // the number of relocations the assembler will generate for the jump table.
+    // Set directives are all printed before the jump table itself.
+    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
+    if (TAI->getSetDirective() && IsPic)
+      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
+        if (EmittedSets.insert(JTBBs[ii]))
+          printPICJumpTableSetLabel(i, JTBBs[ii]);
+    
+    // On some targets (e.g. darwin) we want to emit two consequtive labels
+    // before each jump table.  The first label is never referenced, but tells
+    // the assembler and linker the extents of the jump table object.  The
+    // second label is actually referenced by the code.
+    if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
+      O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
+    
+    O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 
+      << '_' << i << ":\n";
+    
+    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
+      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
+      O << '\n';
+    }
+  }
+}
+
+void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
+                                        const MachineBasicBlock *MBB,
+                                        unsigned uid)  const {
+  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
+  
+  // Use JumpTableDirective otherwise honor the entry size from the jump table
+  // info.
+  const char *JTEntryDirective = TAI->getJumpTableDirective();
+  bool HadJTEntryDirective = JTEntryDirective != NULL;
+  if (!HadJTEntryDirective) {
+    JTEntryDirective = MJTI->getEntrySize() == 4 ?
+      TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
+  }
+
+  O << JTEntryDirective << ' ';
+
+  // If we have emitted set directives for the jump table entries, print 
+  // them rather than the entries themselves.  If we're emitting PIC, then
+  // emit the table entries as differences between two text section labels.
+  // If we're emitting non-PIC code, then emit the entries as direct
+  // references to the target basic blocks.
+  if (IsPic) {
+    if (TAI->getSetDirective()) {
+      O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
+        << '_' << uid << "_set_" << MBB->getNumber();
+    } else {
+      printBasicBlockLabel(MBB, false, false, false);
+      // If the arch uses custom Jump Table directives, don't calc relative to
+      // JT
+      if (!HadJTEntryDirective) 
+        O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
+          << getFunctionNumber() << '_' << uid;
+    }
+  } else {
+    printBasicBlockLabel(MBB, false, false, false);
+  }
+}
+
+
+/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
+/// special global used by LLVM.  If so, emit it and return true, otherwise
+/// do nothing and return false.
+bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
+  if (GV->getName() == "llvm.used") {
+    if (TAI->getUsedDirective() != 0)    // No need to emit this at all.
+      EmitLLVMUsedList(GV->getInitializer());
+    return true;
+  }
+
+  // Ignore debug and non-emitted data.
+  if (GV->getSection() == "llvm.metadata") return true;
+  
+  if (!GV->hasAppendingLinkage()) return false;
+
+  assert(GV->hasInitializer() && "Not a special LLVM global!");
+  
+  const TargetData *TD = TM.getTargetData();
+  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
+  if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
+    SwitchToDataSection(TAI->getStaticCtorsSection());
+    EmitAlignment(Align, 0);
+    EmitXXStructorList(GV->getInitializer());
+    return true;
+  } 
+  
+  if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
+    SwitchToDataSection(TAI->getStaticDtorsSection());
+    EmitAlignment(Align, 0);
+    EmitXXStructorList(GV->getInitializer());
+    return true;
+  }
+  
+  return false;
+}
+
+/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
+/// global in the specified llvm.used list as being used with this directive.
+void AsmPrinter::EmitLLVMUsedList(Constant *List) {
+  const char *Directive = TAI->getUsedDirective();
+
+  // Should be an array of 'sbyte*'.
+  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
+  if (InitList == 0) return;
+  
+  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+    O << Directive;
+    EmitConstantValueOnly(InitList->getOperand(i));
+    O << '\n';
+  }
+}
+
+/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the 
+/// function pointers, ignoring the init priority.
+void AsmPrinter::EmitXXStructorList(Constant *List) {
+  // Should be an array of '{ int, void ()* }' structs.  The first value is the
+  // init priority, which we ignore.
+  if (!isa<ConstantArray>(List)) return;
+  ConstantArray *InitList = cast<ConstantArray>(List);
+  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
+    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
+      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
+
+      if (CS->getOperand(1)->isNullValue())
+        return;  // Found a null terminator, exit printing.
+      // Emit the function pointer.
+      EmitGlobalConstant(CS->getOperand(1));
+    }
+}
+
+/// getGlobalLinkName - Returns the asm/link name of of the specified
+/// global variable.  Should be overridden by each target asm printer to
+/// generate the appropriate value.
+const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
+  std::string LinkName;
+  
+  if (isa<Function>(GV)) {
+    LinkName += TAI->getFunctionAddrPrefix();
+    LinkName += Mang->getValueName(GV);
+    LinkName += TAI->getFunctionAddrSuffix();
+  } else {
+    LinkName += TAI->getGlobalVarAddrPrefix();
+    LinkName += Mang->getValueName(GV);
+    LinkName += TAI->getGlobalVarAddrSuffix();
+  }  
+  
+  return LinkName;
+}
+
+/// EmitExternalGlobal - Emit the external reference to a global variable.
+/// Should be overridden if an indirect reference should be used.
+void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
+  O << getGlobalLinkName(GV);
+}
+
+
+
+//===----------------------------------------------------------------------===//
+/// LEB 128 number encoding.
+
+/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
+/// representing an unsigned leb128 value.
+void AsmPrinter::PrintULEB128(unsigned Value) const {
+  do {
+    unsigned Byte = Value & 0x7f;
+    Value >>= 7;
+    if (Value) Byte |= 0x80;
+    O << "0x" << std::hex << Byte << std::dec;
+    if (Value) O << ", ";
+  } while (Value);
+}
+
+/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
+/// representing a signed leb128 value.
+void AsmPrinter::PrintSLEB128(int Value) const {
+  int Sign = Value >> (8 * sizeof(Value) - 1);
+  bool IsMore;
+
+  do {
+    unsigned Byte = Value & 0x7f;
+    Value >>= 7;
+    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+    if (IsMore) Byte |= 0x80;
+    O << "0x" << std::hex << Byte << std::dec;
+    if (IsMore) O << ", ";
+  } while (IsMore);
+}
+
+//===--------------------------------------------------------------------===//
+// Emission and print routines
+//
+
+/// PrintHex - Print a value as a hexidecimal value.
+///
+void AsmPrinter::PrintHex(int Value) const { 
+  O << "0x" << std::hex << Value << std::dec;
+}
+
+/// EOL - Print a newline character to asm stream.  If a comment is present
+/// then it will be printed first.  Comments should not contain '\n'.
+void AsmPrinter::EOL() const {
+  O << '\n';
+}
+
+void AsmPrinter::EOL(const std::string &Comment) const {
+  if (VerboseAsm && !Comment.empty()) {
+    O << '\t'
+      << TAI->getCommentString()
+      << ' '
+      << Comment;
+  }
+  O << '\n';
+}
+
+void AsmPrinter::EOL(const char* Comment) const {
+  if (VerboseAsm && *Comment) {
+    O << '\t'
+      << TAI->getCommentString()
+      << ' '
+      << Comment;
+  }
+  O << '\n';
+}
+
+/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
+/// unsigned leb128 value.
+void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
+  if (TAI->hasLEB128()) {
+    O << "\t.uleb128\t"
+      << Value;
+  } else {
+    O << TAI->getData8bitsDirective();
+    PrintULEB128(Value);
+  }
+}
+
+/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
+/// signed leb128 value.
+void AsmPrinter::EmitSLEB128Bytes(int Value) const {
+  if (TAI->hasLEB128()) {
+    O << "\t.sleb128\t"
+      << Value;
+  } else {
+    O << TAI->getData8bitsDirective();
+    PrintSLEB128(Value);
+  }
+}
+
+/// EmitInt8 - Emit a byte directive and value.
+///
+void AsmPrinter::EmitInt8(int Value) const {
+  O << TAI->getData8bitsDirective();
+  PrintHex(Value & 0xFF);
+}
+
+/// EmitInt16 - Emit a short directive and value.
+///
+void AsmPrinter::EmitInt16(int Value) const {
+  O << TAI->getData16bitsDirective();
+  PrintHex(Value & 0xFFFF);
+}
+
+/// EmitInt32 - Emit a long directive and value.
+///
+void AsmPrinter::EmitInt32(int Value) const {
+  O << TAI->getData32bitsDirective();
+  PrintHex(Value);
+}
+
+/// EmitInt64 - Emit a long long directive and value.
+///
+void AsmPrinter::EmitInt64(uint64_t Value) const {
+  if (TAI->getData64bitsDirective()) {
+    O << TAI->getData64bitsDirective();
+    PrintHex(Value);
+  } else {
+    if (TM.getTargetData()->isBigEndian()) {
+      EmitInt32(unsigned(Value >> 32)); O << '\n';
+      EmitInt32(unsigned(Value));
+    } else {
+      EmitInt32(unsigned(Value)); O << '\n';
+      EmitInt32(unsigned(Value >> 32));
+    }
+  }
+}
+
+/// toOctal - Convert the low order bits of X into an octal digit.
+///
+static inline char toOctal(int X) {
+  return (X&7)+'0';
+}
+
+/// printStringChar - Print a char, escaped if necessary.
+///
+static void printStringChar(std::ostream &O, unsigned char C) {
+  if (C == '"') {
+    O << "\\\"";
+  } else if (C == '\\') {
+    O << "\\\\";
+  } else if (isprint(C)) {
+    O << C;
+  } else {
+    switch(C) {
+    case '\b': O << "\\b"; break;
+    case '\f': O << "\\f"; break;
+    case '\n': O << "\\n"; break;
+    case '\r': O << "\\r"; break;
+    case '\t': O << "\\t"; break;
+    default:
+      O << '\\';
+      O << toOctal(C >> 6);
+      O << toOctal(C >> 3);
+      O << toOctal(C >> 0);
+      break;
+    }
+  }
+}
+
+/// EmitString - Emit a string with quotes and a null terminator.
+/// Special characters are emitted properly.
+/// \literal (Eg. '\t') \endliteral
+void AsmPrinter::EmitString(const std::string &String) const {
+  const char* AscizDirective = TAI->getAscizDirective();
+  if (AscizDirective)
+    O << AscizDirective;
+  else
+    O << TAI->getAsciiDirective();
+  O << '\"';
+  for (unsigned i = 0, N = String.size(); i < N; ++i) {
+    unsigned char C = String[i];
+    printStringChar(O, C);
+  }
+  if (AscizDirective)
+    O << '\"';
+  else
+    O << "\\0\"";
+}
+
+
+/// EmitFile - Emit a .file directive.
+void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
+  O << "\t.file\t" << Number << " \"";
+  for (unsigned i = 0, N = Name.size(); i < N; ++i) {
+    unsigned char C = Name[i];
+    printStringChar(O, C);
+  }
+  O << '\"';
+}
+
+
+//===----------------------------------------------------------------------===//
+
+// EmitAlignment - Emit an alignment directive to the specified power of
+// two boundary.  For example, if you pass in 3 here, you will get an 8
+// byte alignment.  If a global value is specified, and if that global has
+// an explicit alignment requested, it will unconditionally override the
+// alignment request.  However, if ForcedAlignBits is specified, this value
+// has final say: the ultimate alignment will be the max of ForcedAlignBits
+// and the alignment computed with NumBits and the global.
+//
+// The algorithm is:
+//     Align = NumBits;
+//     if (GV && GV->hasalignment) Align = GV->getalignment();
+//     Align = std::max(Align, ForcedAlignBits);
+//
+void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
+                               unsigned ForcedAlignBits,
+                               bool UseFillExpr) const {
+  if (GV && GV->getAlignment())
+    NumBits = Log2_32(GV->getAlignment());
+  NumBits = std::max(NumBits, ForcedAlignBits);
+  
+  if (NumBits == 0) return;   // No need to emit alignment.
+  if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
+  O << TAI->getAlignDirective() << NumBits;
+
+  unsigned FillValue = TAI->getTextAlignFillValue();
+  UseFillExpr &= IsInTextSection && FillValue;
+  if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
+  O << '\n';
+}
+
+    
+/// EmitZeros - Emit a block of zeros.
+///
+void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
+  if (NumZeros) {
+    if (TAI->getZeroDirective()) {
+      O << TAI->getZeroDirective() << NumZeros;
+      if (TAI->getZeroDirectiveSuffix())
+        O << TAI->getZeroDirectiveSuffix();
+      O << '\n';
+    } else {
+      for (; NumZeros; --NumZeros)
+        O << TAI->getData8bitsDirective() << "0\n";
+    }
+  }
+}
+
+// Print out the specified constant, without a storage class.  Only the
+// constants valid in constant expressions can occur here.
+void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
+  if (CV->isNullValue() || isa<UndefValue>(CV))
+    O << '0';
+  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
+    O << CI->getZExtValue();
+  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
+    // This is a constant address for a global variable or function. Use the
+    // name of the variable or function as the address value, possibly
+    // decorating it with GlobalVarAddrPrefix/Suffix or
+    // FunctionAddrPrefix/Suffix (these all default to "" )
+    if (isa<Function>(GV)) {
+      O << TAI->getFunctionAddrPrefix()
+        << Mang->getValueName(GV)
+        << TAI->getFunctionAddrSuffix();
+    } else {
+      O << TAI->getGlobalVarAddrPrefix()
+        << Mang->getValueName(GV)
+        << TAI->getGlobalVarAddrSuffix();
+    }
+  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
+    const TargetData *TD = TM.getTargetData();
+    unsigned Opcode = CE->getOpcode();    
+    switch (Opcode) {
+    case Instruction::GetElementPtr: {
+      // generate a symbolic expression for the byte address
+      const Constant *ptrVal = CE->getOperand(0);
+      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
+      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
+                                                idxVec.size())) {
+        if (Offset)
+          O << '(';
+        EmitConstantValueOnly(ptrVal);
+        if (Offset > 0)
+          O << ") + " << Offset;
+        else if (Offset < 0)
+          O << ") - " << -Offset;
+      } else {
+        EmitConstantValueOnly(ptrVal);
+      }
+      break;
+    }
+    case Instruction::Trunc:
+    case Instruction::ZExt:
+    case Instruction::SExt:
+    case Instruction::FPTrunc:
+    case Instruction::FPExt:
+    case Instruction::UIToFP:
+    case Instruction::SIToFP:
+    case Instruction::FPToUI:
+    case Instruction::FPToSI:
+      assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
+      break;
+    case Instruction::BitCast:
+      return EmitConstantValueOnly(CE->getOperand(0));
+
+    case Instruction::IntToPtr: {
+      // Handle casts to pointers by changing them into casts to the appropriate
+      // integer type.  This promotes constant folding and simplifies this code.
+      Constant *Op = CE->getOperand(0);
+      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
+      return EmitConstantValueOnly(Op);
+    }
+      
+      
+    case Instruction::PtrToInt: {
+      // Support only foldable casts to/from pointers that can be eliminated by
+      // changing the pointer to the appropriately sized integer type.
+      Constant *Op = CE->getOperand(0);
+      const Type *Ty = CE->getType();
+
+      // We can emit the pointer value into this slot if the slot is an
+      // integer slot greater or equal to the size of the pointer.
+      if (TD->getABITypeSize(Ty) >= TD->getABITypeSize(Op->getType()))
+        return EmitConstantValueOnly(Op);
+
+      O << "((";
+      EmitConstantValueOnly(Op);
+      APInt ptrMask = APInt::getAllOnesValue(TD->getABITypeSizeInBits(Ty));
+      
+      SmallString<40> S;
+      ptrMask.toStringUnsigned(S);
+      O << ") & " << S.c_str() << ')';
+      break;
+    }
+    case Instruction::Add:
+    case Instruction::Sub:
+    case Instruction::And:
+    case Instruction::Or:
+    case Instruction::Xor:
+      O << '(';
+      EmitConstantValueOnly(CE->getOperand(0));
+      O << ')';
+      switch (Opcode) {
+      case Instruction::Add:
+       O << " + ";
+       break;
+      case Instruction::Sub:
+       O << " - ";
+       break;
+      case Instruction::And:
+       O << " & ";
+       break;
+      case Instruction::Or:
+       O << " | ";
+       break;
+      case Instruction::Xor:
+       O << " ^ ";
+       break;
+      default:
+       break;
+      }
+      O << '(';
+      EmitConstantValueOnly(CE->getOperand(1));
+      O << ')';
+      break;
+    default:
+      assert(0 && "Unsupported operator!");
+    }
+  } else {
+    assert(0 && "Unknown constant value!");
+  }
+}
+
+/// printAsCString - Print the specified array as a C compatible string, only if
+/// the predicate isString is true.
+///
+static void printAsCString(std::ostream &O, const ConstantArray *CVA,
+                           unsigned LastElt) {
+  assert(CVA->isString() && "Array is not string compatible!");
+
+  O << '\"';
+  for (unsigned i = 0; i != LastElt; ++i) {
+    unsigned char C =
+        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
+    printStringChar(O, C);
+  }
+  O << '\"';
+}
+
+/// EmitString - Emit a zero-byte-terminated string constant.
+///
+void AsmPrinter::EmitString(const ConstantArray *CVA) const {
+  unsigned NumElts = CVA->getNumOperands();
+  if (TAI->getAscizDirective() && NumElts && 
+      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
+    O << TAI->getAscizDirective();
+    printAsCString(O, CVA, NumElts-1);
+  } else {
+    O << TAI->getAsciiDirective();
+    printAsCString(O, CVA, NumElts);
+  }
+  O << '\n';
+}
+
+/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
+void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
+  const TargetData *TD = TM.getTargetData();
+  unsigned Size = TD->getABITypeSize(CV->getType());
+
+  if (CV->isNullValue() || isa<UndefValue>(CV)) {
+    EmitZeros(Size);
+    return;
+  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
+    if (CVA->isString()) {
+      EmitString(CVA);
+    } else { // Not a string.  Print the values in successive locations
+      for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
+        EmitGlobalConstant(CVA->getOperand(i));
+    }
+    return;
+  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
+    // Print the fields in successive locations. Pad to align if needed!
+    const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
+    uint64_t sizeSoFar = 0;
+    for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
+      const Constant* field = CVS->getOperand(i);
+
+      // Check if padding is needed and insert one or more 0s.
+      uint64_t fieldSize = TD->getABITypeSize(field->getType());
+      uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
+                          - cvsLayout->getElementOffset(i)) - fieldSize;
+      sizeSoFar += fieldSize + padSize;
+
+      // Now print the actual field value.
+      EmitGlobalConstant(field);
+
+      // Insert padding - this may include padding to increase the size of the
+      // current field up to the ABI size (if the struct is not packed) as well
+      // as padding to ensure that the next field starts at the right offset.
+      EmitZeros(padSize);
+    }
+    assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
+           "Layout of constant struct may be incorrect!");
+    return;
+  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
+    // FP Constants are printed as integer constants to avoid losing
+    // precision...
+    if (CFP->getType() == Type::DoubleTy) {
+      double Val = CFP->getValueAPF().convertToDou