tools/llvm2cpp/CppWriter.cpp

//===-- CppWriter.cpp - Printing LLVM IR as a C++ Source File -------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the writing of the LLVM IR as a set of C++ calls to the
// LLVM IR interface. The input module is assumed to be verified.
//
//===----------------------------------------------------------------------===//

#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/InlineAsm.h"
#include "llvm/Instruction.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/SymbolTable.h"
#include "llvm/Support/CFG.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
#include <iostream>
#include <set>

using namespace llvm;

namespace {
typedef std::vector<const Type*> TypeList;
typedef std::map<const Type*,std::string> TypeMap;
typedef std::map<const Value*,std::string> ValueMap;
typedef std::set<std::string> NameSet;

class CppWriter {
  std::ostream &Out;
  const Module *TheModule;
  unsigned long uniqueNum;
  TypeMap TypeNames;
  ValueMap ValueNames;
  TypeMap UnresolvedTypes;
  TypeList TypeStack;
  NameSet UsedNames;

public:
  inline CppWriter(std::ostream &o, const Module *M)
    : Out(o), TheModule(M), uniqueNum(0), TypeNames(),
      ValueNames(), UnresolvedTypes(), TypeStack() { }

  const Module* getModule() { return TheModule; }

  void printModule(const Module *M);

private:
  void printTypes(const Module* M);
  void printConstants(const Module* M);
  void printConstant(const Constant *CPV);
  void printGlobal(const GlobalVariable *GV);
  void printFunctionHead(const Function *F);
  void printFunctionBody(const Function *F);
  void printInstruction(const Instruction *I, const std::string& bbname);
  void printSymbolTable(const SymbolTable &ST);
  void printLinkageType(GlobalValue::LinkageTypes LT);
  void printCallingConv(unsigned cc);

  std::string getCppName(const Type* val);
  std::string getCppName(const Value* val);
  inline void printCppName(const Value* val);
  inline void printCppName(const Type* val);
  bool isOnStack(const Type*) const;
  inline void printTypeDef(const Type* Ty);
  bool printTypeDefInternal(const Type* Ty);
  void printEscapedString(const std::string& str);
};

// printEscapedString - Print each character of the specified string, escaping
// it if it is not printable or if it is an escape char.
void 
CppWriter::printEscapedString(const std::string &Str) {
  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
    unsigned char C = Str[i];
    if (isprint(C) && C != '"' && C != '\\') {
      Out << C;
    } else {
      Out << '\\'
          << (char) ((C/16  < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
          << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
    }
  }
}

inline const char* 
getTypePrefix(const Type* Ty ) {
  const char* prefix;
  switch (Ty->getTypeID()) {
    case Type::VoidTyID:     prefix = "void_"; break;
    case Type::BoolTyID:     prefix = "bool_"; break; 
    case Type::UByteTyID:    prefix = "ubyte_"; break;
    case Type::SByteTyID:    prefix = "sbyte_"; break;
    case Type::UShortTyID:   prefix = "ushort_"; break;
    case Type::ShortTyID:    prefix = "short_"; break;
    case Type::UIntTyID:     prefix = "uint_"; break;
    case Type::IntTyID:      prefix = "int_"; break;
    case Type::ULongTyID:    prefix = "ulong_"; break;
    case Type::LongTyID:     prefix = "long_"; break;
    case Type::FloatTyID:    prefix = "float_"; break;
    case Type::DoubleTyID:   prefix = "double_"; break;
    case Type::LabelTyID:    prefix = "label_"; break;
    case Type::FunctionTyID: prefix = "func_"; break;
    case Type::StructTyID:   prefix = "struct_"; break;
    case Type::ArrayTyID:    prefix = "array_"; break;
    case Type::PointerTyID:  prefix = "ptr_"; break;
    case Type::PackedTyID:   prefix = "packed_"; break;
    case Type::OpaqueTyID:   prefix = "opaque_"; break;
    default:                 prefix = "other_"; break;
  }
  return prefix;
}

std::string
CppWriter::getCppName(const Value* val) {
  std::string name;
  ValueMap::iterator I = ValueNames.find(val);
  if (I != ValueNames.end() && I->first == val)
    return  I->second;

  if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(val)) {
    name = std::string("gvar_") + 
           getTypePrefix(GV->getType()->getElementType());
  } else if (const Function* F = dyn_cast<Function>(val)) {
    name = std::string("func_");
  } else if (const Constant* C = dyn_cast<Constant>(val)) {
    name = std::string("const_") + getTypePrefix(C->getType());
  } else {
    name = getTypePrefix(val->getType());
  }
  name += (val->hasName() ? val->getName() : utostr(uniqueNum++));
  NameSet::iterator NI = UsedNames.find(name);
  if (NI != UsedNames.end())
    name += std::string("_") + utostr(uniqueNum++);
  UsedNames.insert(name);
  return ValueNames[val] = name;
}

void
CppWriter::printCppName(const Value* val) {
  printEscapedString(getCppName(val));
}

void
CppWriter::printCppName(const Type* Ty)
{
  printEscapedString(getCppName(Ty));
}

// Gets the C++ name for a type. Returns true if we already saw the type,
// false otherwise.
//
inline const std::string* 
findTypeName(const SymbolTable& ST, const Type* Ty)
{
  SymbolTable::type_const_iterator TI = ST.type_begin();
  SymbolTable::type_const_iterator TE = ST.type_end();
  for (;TI != TE; ++TI)
    if (TI->second == Ty)
      return &(TI->first);
  return 0;
}

std::string
CppWriter::getCppName(const Type* Ty)
{
  // First, handle the primitive types .. easy
  if (Ty->isPrimitiveType()) {
    switch (Ty->getTypeID()) {
      case Type::VoidTyID:     return "Type::VoidTy";
      case Type::BoolTyID:     return "Type::BoolTy"; 
      case Type::UByteTyID:    return "Type::UByteTy";
      case Type::SByteTyID:    return "Type::SByteTy";
      case Type::UShortTyID:   return "Type::UShortTy";
      case Type::ShortTyID:    return "Type::ShortTy";
      case Type::UIntTyID:     return "Type::UIntTy";
      case Type::IntTyID:      return "Type::IntTy";
      case Type::ULongTyID:    return "Type::ULongTy";
      case Type::LongTyID:     return "Type::LongTy";
      case Type::FloatTyID:    return "Type::FloatTy";
      case Type::DoubleTyID:   return "Type::DoubleTy";
      case Type::LabelTyID:    return "Type::LabelTy";
      default:
        assert(!"Can't get here");
        break;
    }
    return "Type::VoidTy"; // shouldn't be returned, but make it sensible
  }

  // Now, see if we've seen the type before and return that
  TypeMap::iterator I = TypeNames.find(Ty);
  if (I != TypeNames.end())
    return I->second;

  // Okay, let's build a new name for this type. Start with a prefix
  const char* prefix = 0;
  switch (Ty->getTypeID()) {
    case Type::FunctionTyID:    prefix = "FuncTy_"; break;
    case Type::StructTyID:      prefix = "StructTy_"; break;
    case Type::ArrayTyID:       prefix = "ArrayTy_"; break;
    case Type::PointerTyID:     prefix = "PointerTy_"; break;
    case Type::OpaqueTyID:      prefix = "OpaqueTy_"; break;
    case Type::PackedTyID:      prefix = "PackedTy_"; break;
    default:                    prefix = "OtherTy_"; break; // prevent breakage
  }

  // See if the type has a name in the symboltable and build accordingly
  const std::string* tName = findTypeName(TheModule->getSymbolTable(), Ty);
  std::string name;
  if (tName) 
    name = std::string(prefix) + *tName;
  else
    name = std::string(prefix) + utostr(uniqueNum++);

  // Save the name
  return TypeNames[Ty] = name;
}

void CppWriter::printModule(const Module *M) {
  Out << "\n// Module Construction\n";
  Out << "Module* mod = new Module(\"";
  if (M->getModuleIdentifier() == "-")
    printEscapedString("<stdin>");
  else 
    printEscapedString(M->getModuleIdentifier());
  Out << "\");\n";
  Out << "mod->setEndianness(";
  switch (M->getEndianness()) {
    case Module::LittleEndian: Out << "Module::LittleEndian);\n"; break;
    case Module::BigEndian:    Out << "Module::BigEndian);\n";    break;
    case Module::AnyEndianness:Out << "Module::AnyEndianness);\n";  break;
  }
  Out << "mod->setPointerSize(";
  switch (M->getPointerSize()) {
    case Module::Pointer32:      Out << "Module::Pointer32);\n"; break;
    case Module::Pointer64:      Out << "Module::Pointer64);\n"; break;
    case Module::AnyPointerSize: Out << "Module::AnyPointerSize);\n"; break;
  }
  if (!M->getTargetTriple().empty())
    Out << "mod->setTargetTriple(\"" << M->getTargetTriple() << "\");\n";

  if (!M->getModuleInlineAsm().empty()) {
    Out << "mod->setModuleInlineAsm(\"";
    printEscapedString(M->getModuleInlineAsm());
    Out << "\");\n";
  }
  
  // Loop over the dependent libraries and emit them.
  Module::lib_iterator LI = M->lib_begin();
  Module::lib_iterator LE = M->lib_end();
  while (LI != LE) {
    Out << "mod->addLibrary(\"" << *LI << "\");\n";
    ++LI;
  }

  // Print out all the type definitions
  Out << "\n// Type Definitions\n";
  printTypes(M);

  // Print out all the constants declarations
  Out << "\n// Constant Definitions\n";
  printConstants(M);

  // Process the global variables
  Out << "\n// Global Variable Definitions\n";
  for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I) {
    printGlobal(I);
  }

  // Functions can call each other so define all the functions first before
  // emitting their function bodies.
  Out << "\n// Function Declarations\n";
  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
    printFunctionHead(I);

  // Output all of the function bodies.
  Out << "\n// Function Definitions\n";
  for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
    Out << "\n// Function: " << I->getName() << "(" << getCppName(I) << ")\n";
    Out << "{\n";
    printFunctionBody(I);
    Out << "}\n";
  }
}

void
CppWriter::printCallingConv(unsigned cc){
  // Print the calling convention.
  switch (cc) {
    case CallingConv::C:     Out << "CallingConv::C"; break;
    case CallingConv::CSRet: Out << "CallingConv::CSRet"; break;
    case CallingConv::Fast:  Out << "CallingConv::Fast"; break;
    case CallingConv::Cold:  Out << "CallingConv::Cold"; break;
    case CallingConv::FirstTargetCC: Out << "CallingConv::FirstTargetCC"; break;
    default:                 Out << cc; break;
  }
}

void 
CppWriter::printLinkageType(GlobalValue::LinkageTypes LT) {
  switch (LT) {
    case GlobalValue::InternalLinkage:  
      Out << "GlobalValue::InternalLinkage"; break;
    case GlobalValue::LinkOnceLinkage:  
      Out << "GlobalValue::LinkOnceLinkage "; break;
    case GlobalValue::WeakLinkage:      
      Out << "GlobalValue::WeakLinkage"; break;
    case GlobalValue::AppendingLinkage: 
      Out << "GlobalValue::AppendingLinkage"; break;
    case GlobalValue::ExternalLinkage: 
      Out << "GlobalValue::ExternalLinkage"; break;
    case GlobalValue::GhostLinkage:
      Out << "GlobalValue::GhostLinkage"; break;
  }
}
void CppWriter::printGlobal(const GlobalVariable *GV) {
  Out << "\n";
  Out << "GlobalVariable* ";
  printCppName(GV);
  Out << " = new GlobalVariable(\n";
  Out << "  /*Type=*/";
  printCppName(GV->getType()->getElementType());
  Out << ",\n";
  Out << "  /*isConstant=*/" << (GV->isConstant()?"true":"false") 
      << ",\n  /*Linkage=*/";
  printLinkageType(GV->getLinkage());
  Out << ",\n  /*Initializer=*/";
  if (GV->hasInitializer()) {
    printCppName(GV->getInitializer());
  } else {
    Out << "0";
  }
  Out << ",\n  /*Name=*/\"";
  printEscapedString(GV->getName());
  Out << "\",\n  mod);\n";

  if (GV->hasSection()) {
    printCppName(GV);
    Out << "->setSection(\"";
    printEscapedString(GV->getSection());
    Out << "\");\n";
  }
  if (GV->getAlignment()) {
    printCppName(GV);
    Out << "->setAlignment(" << utostr(GV->getAlignment()) << ");\n";
  };
}

bool
CppWriter::isOnStack(const Type* Ty) const {
  TypeList::const_iterator TI = 
    std::find(TypeStack.begin(),TypeStack.end(),Ty);
  return TI != TypeStack.end();
}

// Prints a type definition. Returns true if it could not resolve all the types
// in the definition but had to use a forward reference.
void
CppWriter::printTypeDef(const Type* Ty) {
  assert(TypeStack.empty());
  TypeStack.clear();
  printTypeDefInternal(Ty);
  assert(TypeStack.empty());
  // early resolve as many unresolved types as possible. Search the unresolved
  // types map for the type we just printed. Now that its definition is complete
  // we can resolve any preview references to it. This prevents a cascade of
  // unresolved types.
  TypeMap::iterator I = UnresolvedTypes.find(Ty);
  if (I != UnresolvedTypes.end()) {
    Out << "cast<OpaqueType>(" << I->second 
        << "_fwd.get())->refineAbstractTypeTo(" << I->second << ");\n";
    Out << I->second << " = cast<";
    switch (Ty->getTypeID()) {
      case Type::FunctionTyID: Out << "FunctionType"; break;
      case Type::ArrayTyID:    Out << "ArrayType"; break;
      case Type::StructTyID:   Out << "StructType"; break;
      case Type::PackedTyID:   Out << "PackedType"; break;
      case Type::PointerTyID:  Out << "PointerType"; break;
      case Type::OpaqueTyID:   Out << "OpaqueType"; break;
      default:                 Out << "NoSuchDerivedType"; break;
    }
    Out << ">(" << I->second << "_fwd.get());\n\n";
    UnresolvedTypes.erase(I);
  }
}

bool
CppWriter::printTypeDefInternal(const Type* Ty) {
  // We don't print definitions for primitive types
  if (Ty->isPrimitiveType())
    return false;

  // Determine if the name is in the name list before we modify that list.
  TypeMap::const_iterator TNI = TypeNames.find(Ty);

  // Everything below needs the name for the type so get it now
  std::string typeName(getCppName(Ty));

  // Search the type stack for recursion. If we find it, then generate this
  // as an OpaqueType, but make sure not to do this multiple times because
  // the type could appear in multiple places on the stack. Once the opaque
  // definition is issues, it must not be re-issued. Consequently we have to
  // check the UnresolvedTypes list as well.
  if (isOnStack(Ty)) {
    TypeMap::const_iterator I = UnresolvedTypes.find(Ty);
    if (I == UnresolvedTypes.end()) {
      Out << "PATypeHolder " << typeName << "_fwd = OpaqueType::get();\n";
      UnresolvedTypes[Ty] = typeName;
      return true;
    }
  }

  // Avoid printing things we have already printed. Since TNI was obtained
  // before the name was inserted with getCppName and because we know the name
  // is not on the stack (currently being defined), we can surmise here that if
  // we got the name we've also already emitted its definition.
  if (TNI != TypeNames.end())
    return false;

  // We're going to print a derived type which, by definition, contains other
  // types. So, push this one we're printing onto the type stack to assist with
  // recursive definitions.
  TypeStack.push_back(Ty); // push on type stack
  bool didRecurse = false;

  // Print the type definition
  switch (Ty->getTypeID()) {
    case Type::FunctionTyID:  {
      const FunctionType* FT = cast<FunctionType>(Ty);
      Out << "std::vector<const Type*>" << typeName << "_args;\n";
      FunctionType::param_iterator PI = FT->param_begin();
      FunctionType::param_iterator PE = FT->param_end();
      for (; PI != PE; ++PI) {
        const Type* argTy = static_cast<const Type*>(*PI);
        bool isForward = printTypeDefInternal(argTy);
        std::string argName(getCppName(argTy));
        Out << typeName << "_args.push_back(" << argName;
        if (isForward)
          Out << "_fwd";
        Out << ");\n";
      }
      bool isForward = printTypeDefInternal(FT->getReturnType());
      std::string retTypeName(getCppName(FT->getReturnType()));
      Out << "FunctionType* " << typeName << " = FunctionType::get(\n"
          << "  /*Result=*/" << retTypeName;
      if (isForward)
        Out << "_fwd";
      Out << ",\n  /*Params=*/" << typeName << "_args,\n  /*isVarArg=*/"
          << (FT->isVarArg() ? "true" : "false") << ");\n";
      break;
    }
    case Type::StructTyID: {
      const StructType* ST = cast<StructType>(Ty);
      Out << "std::vector<const Type*>" << typeName << "_fields;\n";
      StructType::element_iterator EI = ST->element_begin();
      StructType::element_iterator EE = ST->element_end();
      for (; EI != EE; ++EI) {
        const Type* fieldTy = static_cast<const Type*>(*EI);
        bool isForward = printTypeDefInternal(fieldTy);
        std::string fieldName(getCppName(fieldTy));
        Out << typeName << "_fields.push_back(" << fieldName;
        if (isForward)
          Out << "_fwd";
        Out << ");\n";
      }
      Out << "StructType* " << typeName << " = StructType::get("
          << typeName << "_fields);\n";
      break;
    }
    case Type::ArrayTyID: {
      const ArrayType* AT = cast<ArrayType>(Ty);
      const Type* ET = AT->getElementType();
      bool isForward = printTypeDefInternal(ET);
      std::string elemName(getCppName(ET));
      Out << "ArrayType* " << typeName << " = ArrayType::get("
          << elemName << (isForward ? "_fwd" : "") 
          << ", " << utostr(AT->getNumElements()) << ");\n";
      break;
    }
    case Type::PointerTyID: {
      const PointerType* PT = cast<PointerType>(Ty);
      const Type* ET = PT->getElementType();
      bool isForward = printTypeDefInternal(ET);
      std::string elemName(getCppName(ET));
      Out << "PointerType* " << typeName << " = PointerType::get("
          << elemName << (isForward ? "_fwd" : "") << ");\n";
      break;
    }
    case Type::PackedTyID: {
      const PackedType* PT = cast<PackedType>(Ty);
      const Type* ET = PT->getElementType();
      bool isForward = printTypeDefInternal(ET);
      std::string elemName(getCppName(ET));
      Out << "PackedType* " << typeName << " = PackedType::get("
          << elemName << (isForward ? "_fwd" : "") 
          << ", " << utostr(PT->getNumElements()) << ");\n";
      break;
    }
    case Type::OpaqueTyID: {
      const OpaqueType* OT = cast<OpaqueType>(Ty);
      Out << "OpaqueType* " << typeName << " = OpaqueType::get();\n";
      break;
    }
    default:
      assert(!"Invalid TypeID");
  }

  // If the type had a name, make sure we recreate it.
  const std::string* progTypeName = 
    findTypeName(TheModule->getSymbolTable(),Ty);
  if (progTypeName)
    Out << "mod->addTypeName(\"" << *progTypeName << "\", " 
        << typeName << ");\n";

  // Pop us off the type stack
  TypeStack.pop_back();
  Out << "\n";

  // We weren't a recursive type
  return false;
}

void
CppWriter::printTypes(const Module* M) {
  // Add all of the global variables to the value table...
  for (Module::const_global_iterator I = TheModule->global_begin(), 
       E = TheModule->global_end(); I != E; ++I) {
    if (I->hasInitializer())
      printTypeDef(I->getInitializer()->getType());
    printTypeDef(I->getType());
  }

  // Add all the functions to the table
  for (Module::const_iterator FI = TheModule->begin(), FE = TheModule->end();
       FI != FE; ++FI) {
    printTypeDef(FI->getReturnType());
    printTypeDef(FI->getFunctionType());
    // Add all the function arguments
    for(Function::const_arg_iterator AI = FI->arg_begin(),
        AE = FI->arg_end(); AI != AE; ++AI) {
      printTypeDef(AI->getType());
    }

    // Add all of the basic blocks and instructions
    for (Function::const_iterator BB = FI->begin(),
         E = FI->end(); BB != E; ++BB) {
      printTypeDef(BB->getType());
      for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; 
           ++I) {
        printTypeDef(I->getType());
      }
    }
  }
}

void
CppWriter::printConstants(const Module* M) {
  // Add all of the global variables to the value table...
  for (Module::const_global_iterator I = TheModule->global_begin(), 
       E = TheModule->global_end(); I != E; ++I)
    if (I->hasInitializer())
      printConstant(I->getInitializer());

  // Traverse the LLVM functions looking for constants
  for (Module::const_iterator FI = TheModule->begin(), FE = TheModule->end();
       FI != FE; ++FI) {
    // Add all of the basic blocks and instructions
    for (Function::const_iterator BB = FI->begin(),
         E = FI->end(); BB != E; ++BB) {
      for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; 
           ++I) {
        for (unsigned i = 0; i < I->getNumOperands(); ++i) {
          if (Constant* C = dyn_cast<Constant>(I->getOperand(i))) {
            printConstant(C);
          }
        }
      }
    }
  }
}

// printConstant - Print out a constant pool entry...
void CppWriter::printConstant(const Constant *CV) {
  // First, if the constant is in the constant list then we've printed it
  // already and we shouldn't reprint it.
  if (ValueNames.find(CV) != ValueNames.end())
    return;

  const int IndentSize = 2;
  static std::string Indent = "\n";
  std::string constName(getCppName(CV));
  std::string typeName(getCppName(CV->getType()));
  if (CV->isNullValue()) {
    Out << "Constant* " << constName << " = Constant::getNullValue("
        << typeName << ");\n";
    return;
  }
  if (isa<GlobalValue>(CV)) {
    // Skip variables and functions, we emit them elsewhere
    return;
  }
  if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
    Out << "Constant* " << constName << " = ConstantBool::get(" 
        << (CB == ConstantBool::True ? "true" : "false")
        << ");";
  } else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV)) {
    Out << "Constant* " << constName << " = ConstantSInt::get(" 
        << typeName << ", " << CI->getValue() << ");";
  } else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV)) {
    Out << "Constant* " << constName << " = ConstantUInt::get(" 
        << typeName << ", " << CI->getValue() << ");";
  } else if (isa<ConstantAggregateZero>(CV)) {
    Out << "Constant* " << constName << " = ConstantAggregateZero::get(" 
        << typeName << ");";
  } else if (isa<ConstantPointerNull>(CV)) {
    Out << "Constant* " << constName << " = ConstanPointerNull::get(" 
        << typeName << ");";
  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
    Out << "ConstantFP::get(" << typeName << ", ";
    // We would like to output the FP constant value in exponential notation,
    // but we cannot do this if doing so will lose precision.  Check here to
    // make sure that we only output it in exponential format if we can parse
    // the value back and get the same value.
    //
    std::string StrVal = ftostr(CFP->getValue());

    // Check to make sure that the stringized number is not some string like
    // "Inf" or NaN, that atof will accept, but the lexer will not.  Check that
    // the string matches the "[-+]?[0-9]" regex.
    //
    if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
        ((StrVal[0] == '-' || StrVal[0] == '+') &&
         (StrVal[1] >= '0' && StrVal[1] <= '9')))
      // Reparse stringized version!
      if (atof(StrVal.c_str()) == CFP->getValue()) {
        Out << StrVal;
        return;
      }

    // Otherwise we could not reparse it to exactly the same value, so we must
    // output the string in hexadecimal format!
    assert(sizeof(double) == sizeof(uint64_t) &&
           "assuming that double is 64 bits!");
    Out << "0x" << utohexstr(DoubleToBits(CFP->getValue())) << ");";
  } else if (const ConstantArray *CA = dyn_cast<ConstantArray>(CV)) {
    if (CA->isString() && CA->getType()->getElementType() == Type::SByteTy) {
      Out << "Constant* " << constName << " = ConstantArray::get(\"";
      printEscapedString(CA->getAsString());
      Out << "\");";
    } else {
      Out << "std::vector<Constant*> " << constName << "_elems;\n";
      unsigned N = CA->getNumOperands();
      for (unsigned i = 0; i < N; ++i) {
        printConstant(CA->getOperand(i));
        Out << constName << "_elems.push_back("
            << getCppName(CA->getOperand(i)) << ");\n";
      }
      Out << "Constant* " << constName << " = ConstantArray::get(" 
          << typeName << ", " << constName << "_elems);";
    }
  } else if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(CV)) {
    Out << "std::vector<Constant*> " << constName << "_fields;\n";
    unsigned N = CS->getNumOperands();
    for (unsigned i = 0; i < N; i++) {
      printConstant(CS->getOperand(i));
      Out << constName << "_fields.push_back("
          << getCppName(CS->getOperand(i)) << ");\n";
    }
    Out << "Constant* " << constName << " = ConstantStruct::get(" 
        << typeName << ", " << constName << "_fields);";
  } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
    Out << "std::vector<Constant*> " << constName << "_elems;\n";
    unsigned N = CP->getNumOperands();
    for (unsigned i = 0; i < N; ++i) {
      printConstant(CP->getOperand(i));
      Out << constName << "_elems.push_back("
          << getCppName(CP->getOperand(i)) << ");\n";
    }
    Out << "Constant* " << constName << " = ConstantPacked::get(" 
        << typeName << ", " << constName << "_elems);";
  } else if (isa<UndefValue>(CV)) {
    Out << "Constant* " << constName << " = UndefValue::get(" 
        << typeName << ");";
  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
    if (CE->getOpcode() == Instruction::GetElementPtr) {
      Out << "std::vector<Constant*> " << constName << "_indices;\n";
      for (unsigned i = 1; i < CE->getNumOperands(); ++i ) {
        Out << constName << "_indices.push_back("
            << getCppName(CE->getOperand(i)) << ");\n";
      }
      Out << "Constant* " << constName << " = new GetElementPtrInst(" 
          << getCppName(CE->getOperand(0)) << ", " << constName << "_indices";
    } else if (CE->getOpcode() == Instruction::Cast) {
      Out << "Constant* " << constName << " = ConstantExpr::getCast(";
      Out << getCppName(CE->getOperand(0)) << ", " << getCppName(CE->getType())
          << ");";
    } else {
      Out << "Constant* " << constName << " = ConstantExpr::";
      switch (CE->getOpcode()) {
        case Instruction::Add:    Out << "getAdd";  break;
        case Instruction::Sub:    Out << "getSub"; break;
        case Instruction::Mul:    Out << "getMul"; break;
        case Instruction::Div:    Out << "getDiv"; break;
        case Instruction::Rem:    Out << "getRem"; break;
        case Instruction::And:    Out << "getAnd"; break;
        case Instruction::Or:     Out << "getOr"; break;
        case Instruction::Xor:    Out << "getXor"; break;
        case Instruction::SetEQ:  Out << "getSetEQ"; break;
        case Instruction::SetNE:  Out << "getSetNE"; break;
        case Instruction::SetLE:  Out << "getSetLE"; break;
        case Instruction::SetGE:  Out << "getSetGE"; break;
        case Instruction::SetLT:  Out << "getSetLT"; break;
        case Instruction::SetGT:  Out << "getSetGT"; break;
        case Instruction::Shl:    Out << "getShl"; break;
        case Instruction::Shr:    Out << "getShr"; break;
        case Instruction::Select: Out << "getSelect"; break;
        case Instruction::ExtractElement: Out << "getExtractElement"; break;
        case Instruction::InsertElement:  Out << "getInsertElement"; break;
        case Instruction::ShuffleVector:  Out << "getShuffleVector"; break;
        default:
          assert(!"Invalid constant expression");
          break;
      }
      Out << getCppName(CE->getOperand(0));
      for (unsigned i = 1; i < CE->getNumOperands(); ++i) 
        Out << ", " << getCppName(CE->getOperand(i));
      Out << ");";
    }
  } else {
    assert(!"Bad Constant");
    Out << "Constant* " << constName << " = 0; ";
  }
  Out << "\n";
}

void CppWriter::printFunctionHead(const Function* F) {
  Out << "Function* " << getCppName(F) << " = new Function("
      << getCppName(F->getFunctionType()) << ", " ;
  printLinkageType(F->getLinkage());
  Out << ",\n  \"" << F->getName() << "\", mod);\n";
  printCppName(F);
  Out << "->setCallingConv(";
  printCallingConv(F->getCallingConv());
  Out << ");\n";
  if (F->hasSection()) {
    printCppName(F);
    Out << "->setSection(" << F->getSection() << ");\n";
  }
  if (F->getAlignment()) {
    printCppName(F);
    Out << "->setAlignment(" << F->getAlignment() << ");\n";
  }
}

void CppWriter::printFunctionBody(const Function *F) {
  if (F->isExternal())
    return; // external functions have no bodies.

  // Create all the argument values
  if (!F->arg_empty()) {
    Out << "  Function::arg_iterator args = " << getCppName(F) 
        << "->arg_begin();\n";
  }
  for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
       AI != AE; ++AI) {
    Out << "  Value* " << getCppName(AI) << " = args++;\n";
    if (AI->hasName())
      Out << "  " << getCppName(AI) << "->setName(\"" << AI->getName() 
          << "\");\n";
  }

  // Create all the basic blocks
  for (Function::const_iterator BI = F->begin(), BE = F->end(); 
       BI != BE; ++BI) {
    std::string bbname(getCppName(BI));
    Out << "  BasicBlock* " << bbname << " = new BasicBlock(\"";
    if (BI->hasName())
      printEscapedString(BI->getName());
    Out << "\"," << getCppName(BI->getParent()) << ",0);\n";
  }

  // Output all of its basic blocks... for the function
  for (Function::const_iterator BI = F->begin(), BE = F->end(); 
       BI != BE; ++BI) {
    // Output all of the instructions in the basic block...
    for (BasicBlock::const_iterator I = BI->begin(), E = BI->end(); 
         I != E; ++I) {
      std::string bbname(getCppName(BI));
      printInstruction(I,bbname);
    }
  }
}

// printInstruction - This member is called for each Instruction in a function.
void 
CppWriter::printInstruction(const Instruction *I, const std::string& bbname) 
{
  std::string iName(getCppName(I));

  switch (I->getOpcode()) {
    case Instruction::Ret: {
      const ReturnInst* ret =  cast<ReturnInst>(I);
      Out << "  ReturnInst* " << iName << " = new ReturnInst(";
      if (ret->getReturnValue())
        Out << getCppName(ret->getReturnValue()) << ", ";
      Out << bbname << ");";
      break;
    }
    case Instruction::Br: {
      const BranchInst* br = cast<BranchInst>(I);
      Out << "  BranchInst* " << iName << " = new BranchInst(" ;
      if (br->getNumOperands() == 3 ) {
        Out << getCppName(br->getOperand(0)) << ", " 
            << getCppName(br->getOperand(1)) << ", "
            << getCppName(br->getOperand(2)) << ", ";

      } else if (br->getNumOperands() == 1) {
        Out << getCppName(br->getOperand(0)) << ", ";
      } else {
        assert(!"branch with 2 operands?");
      }
      Out << bbname << ");";
      break;
    }
    case Instruction::Switch: {
      const SwitchInst* sw = cast<SwitchInst>(I);
      Out << "  SwitchInst* " << iName << " = new SwitchInst("
          << getCppName(sw->getOperand(0)) << ", "
          << getCppName(sw->getOperand(1)) << ", "
          << sw->getNumCases() << ", " << bbname << ");";
      for (unsigned i = 1; i < sw->getNumCases(); i++ ) {
        Out << "  " << iName << "->addCase(" 
            << getCppName(sw->getCaseValue(i)) << ", "
            << getCppName(sw->getSuccessor(i)) << ");\n";
      }
      break;
    }
    case Instruction::Invoke: {
      const InvokeInst* inv = cast<InvokeInst>(I);
      Out << "  std::vector<Value*> " << iName << "_params;\n";
      for (unsigned i = 3; i < inv->getNumOperands(); ++i)
        Out << "  " << iName << "_params.push_back("
            << getCppName(inv->getOperand(i)) << ");\n";
      Out << "  InvokeInst* " << iName << " = new InvokeInst("
          << getCppName(inv->getCalledFunction()) << ", "
          << getCppName(inv->getNormalDest()) << ", "
          << getCppName(inv->getUnwindDest()) << ", "
          << iName << "_params, \"";
      printEscapedString(inv->getName());
      Out << "\", " << bbname << ");\n";
      Out << iName << "->setCallingConv(";
      printCallingConv(inv->getCallingConv());
      Out << ");";
      break;
    }
    case Instruction::Unwind: {
      Out << "  UnwindInst* " << iName << " = new UnwindInst("
          << bbname << ");";
      break;
    }
    case Instruction::Unreachable:{
      Out << "  UnreachableInst* " << iName << " = new UnreachableInst("
          << bbname << ");";
      break;
    }
    case Instruction::Add:
    case Instruction::Sub:
    case Instruction::Mul:
    case Instruction::Div:
    case Instruction::Rem:
    case Instruction::And:
    case Instruction::Or:
    case Instruction::Xor:
    case Instruction::Shl: 
    case Instruction::Shr:{
      Out << "  BinaryOperator* "  << iName << " = BinaryOperator::create(";
      switch (I->getOpcode()) {
        case Instruction::Add: Out << "Instruction::Add"; break;
        case Instruction::Sub: Out << "Instruction::Sub"; break;
        case Instruction::Mul: Out << "Instruction::Mul"; break;
        case Instruction::Div: Out << "Instruction::Div"; break;
        case Instruction::Rem: Out << "Instruction::Rem"; break;
        case Instruction::And: Out << "Instruction::And"; break;
        case Instruction::Or:  Out << "Instruction::Or"; break;
        case Instruction::Xor: Out << "Instruction::Xor"; break;
        case Instruction::Shl: Out << "Instruction::Shl"; break;
        case Instruction::Shr: Out << "Instruction::Shr"; break;
        default: Out << "Instruction::BadOpCode"; break;
      }
      Out << ", " << getCppName(I->getOperand(0));
      Out << ", " << getCppName(I->getOperand(1)) << ", \"";
      printEscapedString(I->getName());
      Out << "\", " << bbname << ");";
      break;
    }
    case Instruction::SetEQ:
    case Instruction::SetNE:
    case Instruction::SetLE:
    case Instruction::SetGE:
    case Instruction::SetLT:
    case Instruction::SetGT: {
      Out << "  SetCondInst* "  << iName << " = new SetCondInst(";
      switch (I->getOpcode()) {
        case Instruction::SetEQ: Out << "Instruction::SetEQ"; break;
        case Instruction::SetNE: Out << "Instruction::SetNE"; break;
        case Instruction::SetLE: Out << "Instruction::SetLE"; break;
        case Instruction::SetGE: Out << "Instruction::SetGE"; break;
        case Instruction::SetLT: Out << "Instruction::SetLT"; break;
        case Instruction::SetGT: Out << "Instruction::SetGT"; break;
        default: Out << "Instruction::BadOpCode"; break;
      }
      Out << ", " << getCppName(I->getOperand(0));
      Out << ", " << getCppName(I->getOperand(1)) << ", \"";
      printEscapedString(I->getName());
      Out << "\", " << bbname << ");";
      break;
    }
    case Instruction::Malloc: {
      const MallocInst* mallocI = cast<MallocInst>(I);
      Out << "  MallocInst* " << iName << " = new MallocInst("
          << getCppName(mallocI->getAllocatedType()) << ", ";
      if (mallocI->isArrayAllocation())
        Out << getCppName(mallocI->getArraySize()) << ", ";
      Out << "\"";
      printEscapedString(mallocI->getName());
      Out << "\", " << bbname << ");";
      if (mallocI->getAlignment())
        Out << "\n    " << iName << "->setAlignment(" 
            << mallocI->getAlignment() << ");";
      break;
    }
    case Instruction::Free: {
      Out << "  FreeInst* " << iName << " = new FreeInst("
          << getCppName(I->getOperand(0)) << ", " << bbname << ");";
      break;
    }
    case Instruction::Alloca: {
      const AllocaInst* allocaI = cast<AllocaInst>(I);
      Out << "  AllocaInst* " << iName << " = new AllocaInst("
          << getCppName(allocaI->getAllocatedType()) << ", ";
      if (allocaI->isArrayAllocation())
        Out << getCppName(allocaI->getArraySize()) << ", ";
      Out << "\"";
      printEscapedString(allocaI->getName());
      Out << "\", " << bbname << ");";
      if (allocaI->getAlignment())
        Out << "\n    " << iName << "->setAlignment(" 
            << allocaI->getAlignment() << ");";
      break;
    }
    case Instruction::Load:{
      const LoadInst* load = cast<LoadInst>(I);
      Out << "  LoadInst* " << iName << " = new LoadInst(" 
          << getCppName(load->getOperand(0)) << ", " << bbname << ");\n";
      if (load->isVolatile()) 
        Out << "iName->setVolatile(true);";
      break;
    }
    case Instruction::Store: {
      const StoreInst* store = cast<StoreInst>(I);
      Out << "  StoreInst* " << iName << " = new StoreInst(" 
          << getCppName(store->getOperand(0)) << ", "
          << getCppName(store->getOperand(1)) << ", " << bbname << ");\n";
      if (store->isVolatile()) 
        Out << "iName->setVolatile(true);";
      break;
    }
    case Instruction::GetElementPtr: {
      const GetElementPtrInst* gep = cast<GetElementPtrInst>(I);
      if (gep->getNumOperands() <= 2) {
        Out << "  GetElementPtrInst* " << iName << " = new GetElementPtrInst("
            << getCppName(gep->getOperand(0)); 
        if (gep->getNumOperands() == 2)
          Out << ", " << getCppName(gep->getOperand(1));
        Out << ", " << bbname;
      } else {
        Out << "  std::vector<Value*> " << iName << "_indices;\n";
        for (unsigned i = 1; i < gep->getNumOperands(); ++i ) {
          Out << "  " << iName << "_indices.push_back("
              << getCppName(gep->getOperand(i)) << ");\n";
        }
        Out << "  Instruction* " << iName << " = new GetElementPtrInst(" 
            << getCppName(gep->getOperand(0)) << ", " << iName << "_indices";
      }
      Out << ", \"";
      printEscapedString(gep->getName());
      Out << "\", " << bbname << ");";
      break;
    }
    case Instruction::PHI: {
      const PHINode* phi = cast<PHINode>(I);
      Out << "  PHINode* " << iName << " = new PHINode("
          << getCppName(phi->getType()) << ", \"";
      printEscapedString(phi->getName());
      Out << "\", " << bbname << ");\n";
      Out << iName << "->reserveOperandSpace(" << phi->getNumIncomingValues()
          << ");\n";
      for (unsigned i = 0; i < phi->getNumIncomingValues(); ++i) {
        Out << iName << "->addIncomingValue("
            << getCppName(phi->getIncomingValue(i)) << ", "
            << getCppName(phi->getIncomingBlock(i)) << ");\n";
      }
      break;
    }
    case Instruction::Cast: {
      const CastInst* cst = cast<CastInst>(I);
      Out << "  CastInst* " << iName << " = new CastInst("
          << getCppName(cst->getOperand(0)) << ", "
          << getCppName(cst->getType()) << ", \"";
      printEscapedString(cst->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
    case Instruction::Call:{
      const CallInst* call = cast<CallInst>(I);
      if (call->getNumOperands() > 3) {
        Out << "  std::vector<Value*> " << iName << "_params;\n";
        for (unsigned i = 1; i < call->getNumOperands(); ++i) {
          Out << "  " << iName << "_params.push_back("
              << getCppName(call->getOperand(i)) << ");\n";
        }
        Out << "  CallInst* " << iName << " = new CallInst("
            << getCppName(call->getOperand(0)) << ", "
            << iName << "_params, \"";
      } else if (call->getNumOperands() == 3) {
        Out << "  CallInst* " << iName << " = new CallInst("
            << getCppName(call->getOperand(0)) << ", "
            << getCppName(call->getOperand(1)) << ", "
            << getCppName(call->getOperand(2)) << ", \"";
      } else if (call->getNumOperands() == 2) {
        Out << "  CallInst* " << iName << " = new CallInst("
            << getCppName(call->getOperand(0)) << ", "
            << getCppName(call->getOperand(1)) << ", \"";
      } else {
        Out << "  CallInst* " << iName << " = new CallInst("
            << getCppName(call->getOperand(0)) << ", \"";
      }
      printEscapedString(call->getName());
      Out << "\", " << bbname << ");\n";
      Out << iName << "->setCallingConv(";
      printCallingConv(call->getCallingConv());
      Out << ");\n";
      Out << iName << "->setTailCall(" << (call->isTailCall() ? "true":"false");
      Out << ");";
      break;
    }
    case Instruction::Select: {
      const SelectInst* sel = cast<SelectInst>(I);
      Out << "  SelectInst* " << getCppName(sel) << " = new SelectInst(";
      Out << getCppName(sel->getCondition()) << ", ";
      Out << getCppName(sel->getTrueValue()) << ", ";
      Out << getCppName(sel->getFalseValue()) << ", \"";
      printEscapedString(sel->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
    case Instruction::UserOp1:
      /// FALL THROUGH
    case Instruction::UserOp2: {
      /// FIXME: What should be done here?
      break;
    }
    case Instruction::VAArg: {
      const VAArgInst* va = cast<VAArgInst>(I);
      Out << "  VAArgInst* " << getCppName(va) << " = new VAArgInst("
          << getCppName(va->getOperand(0)) << ", "
          << getCppName(va->getType()) << ", \"";
      printEscapedString(va->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
    case Instruction::ExtractElement: {
      const ExtractElementInst* eei = cast<ExtractElementInst>(I);
      Out << "  ExtractElementInst* " << getCppName(eei) 
          << " = new ExtractElementInst(" << getCppName(eei->getOperand(0))
          << ", " << getCppName(eei->getOperand(1)) << ", \"";
      printEscapedString(eei->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
    case Instruction::InsertElement: {
      const InsertElementInst* iei = cast<InsertElementInst>(I);
      Out << "  InsertElementInst* " << getCppName(iei) 
          << " = new InsertElementInst(" << getCppName(iei->getOperand(0))
          << ", " << getCppName(iei->getOperand(1)) << ", "
          << ", " << getCppName(iei->getOperand(2)) << ", \"";
      printEscapedString(iei->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
    case Instruction::ShuffleVector: {
      const ShuffleVectorInst* svi = cast<ShuffleVectorInst>(I);
      Out << "  ShuffleVectorInst* " << getCppName(svi) 
          << " = new ShuffleVectorInst(" << getCppName(svi->getOperand(0))
          << ", " << getCppName(svi->getOperand(1)) << ", "
          << ", " << getCppName(svi->getOperand(2)) << ", \"";
      printEscapedString(svi->getName());
      Out << "\", " << bbname << ");\n";
      break;
    }
  }
  Out << "\n";
}

}  // end anonymous llvm

namespace llvm {

void WriteModuleToCppFile(Module* mod, std::ostream& o) {
  o << "#include <llvm/Module.h>\n";
  o << "#include <llvm/DerivedTypes.h>\n";
  o << "#include <llvm/Constants.h>\n";
  o << "#include <llvm/GlobalVariable.h>\n";
  o << "#include <llvm/Function.h>\n";
  o << "#include <llvm/CallingConv.h>\n";
  o << "#include <llvm/BasicBlock.h>\n";
  o << "#include <llvm/Instructions.h>\n";
  o << "#include <llvm/Pass.h>\n";
  o << "#include <llvm/PassManager.h>\n";
  o << "#include <llvm/Analysis/Verifier.h>\n";
  o << "#include <llvm/Assembly/PrintModulePass.h>\n";
  o << "#include <algorithm>\n";
  o << "#include <iostream>\n\n";
  o << "using namespace llvm;\n\n";
  o << "Module* makeLLVMModule();\n\n";
  o << "int main(int argc, char**argv) {\n";
  o << "  Module* Mod = makeLLVMModule();\n";
  o << "  verifyModule(*Mod, PrintMessageAction);\n";
  o << "  std::cerr.flush();\n";
  o << "  std::cout.flush();\n";
  o << "  PassManager PM;\n";
  o << "  PM.add(new PrintModulePass(&std::cout));\n";
  o << "  PM.run(*Mod);\n";
  o << "  return 0;\n";
  o << "}\n\n";
  o << "Module* makeLLVMModule() {\n";
  CppWriter W(o, mod);
  W.printModule(mod);
  o << "return mod;\n";
  o << "}\n";
}

}