C++ FunctionType::getNumParams方法代码示例

void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
                                bool CannotUsePrivateLabel) const {
  ManglerPrefixTy PrefixTy = Default;
  if (GV->hasPrivateLinkage()) {
    if (CannotUsePrivateLabel)
      PrefixTy = LinkerPrivate;
    else
      PrefixTy = Private;
  }

  const DataLayout &DL = GV->getParent()->getDataLayout();
  if (!GV->hasName()) {
    // Get the ID for the global, assigning a new one if we haven't got one
    // already.
    unsigned &ID = AnonGlobalIDs[GV];
    if (ID == 0)
      ID = AnonGlobalIDs.size();

    // Must mangle the global into a unique ID.
    getNameWithPrefixImpl(OS, "__unnamed_" + Twine(ID), DL, PrefixTy);
    return;
  }

  StringRef Name = GV->getName();
  char Prefix = DL.getGlobalPrefix();

  // Mangle functions with Microsoft calling conventions specially.  Only do
  // this mangling for x86_64 vectorcall and 32-bit x86.
  const Function *MSFunc = dyn_cast<Function>(GV);
  if (Name.startswith("\01"))
    MSFunc = nullptr; // Don't mangle when \01 is present.
  CallingConv::ID CC =
      MSFunc ? MSFunc->getCallingConv() : (unsigned)CallingConv::C;
  if (!DL.hasMicrosoftFastStdCallMangling() &&
      CC != CallingConv::X86_VectorCall)
    MSFunc = nullptr;
  if (MSFunc) {
    if (CC == CallingConv::X86_FastCall)
      Prefix = '@'; // fastcall functions have an @ prefix instead of _.
    else if (CC == CallingConv::X86_VectorCall)
      Prefix = '\0'; // vectorcall functions have no prefix.
  }

  getNameWithPrefixImpl(OS, Name, PrefixTy, DL, Prefix);

  if (!MSFunc)
    return;

  // If we are supposed to add a microsoft-style suffix for stdcall, fastcall,
  // or vectorcall, add it.  These functions have a suffix of @N where N is the
  // cumulative byte size of all of the parameters to the function in decimal.
  if (CC == CallingConv::X86_VectorCall)
    OS << '@'; // vectorcall functions use a double @ suffix.
  FunctionType *FT = MSFunc->getFunctionType();
  if (hasByteCountSuffix(CC) &&
      // "Pure" variadic functions do not receive @0 suffix.
      (!FT->isVarArg() || FT->getNumParams() == 0 ||
       (FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
    addByteCountSuffix(OS, MSFunc, DL);
}

void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
                                bool CannotUsePrivateLabel) const {
  ManglerPrefixTy PrefixTy = Mangler::Default;
  if (GV->hasPrivateLinkage()) {
    if (CannotUsePrivateLabel)
      PrefixTy = Mangler::LinkerPrivate;
    else
      PrefixTy = Mangler::Private;
  }

  if (!GV->hasName()) {
    // Get the ID for the global, assigning a new one if we haven't got one
    // already.
    unsigned &ID = AnonGlobalIDs[GV];
    if (ID == 0)
      ID = NextAnonGlobalID++;

    // Must mangle the global into a unique ID.
    getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy);
    return;
  }

  StringRef Name = GV->getName();

  // No need to do anything special if the global has the special "do not
  // mangle" flag in the name.
  if (Name[0] == '\1') {
    OS << Name.substr(1);
    return;
  }

  bool UseAt = false;
  const Function *MSFunc = nullptr;
  CallingConv::ID CC;
  if (DL->hasMicrosoftFastStdCallMangling()) {
    if ((MSFunc = dyn_cast<Function>(GV))) {
      CC = MSFunc->getCallingConv();
      // fastcall functions need to start with @ instead of _.
      if (CC == CallingConv::X86_FastCall)
        UseAt = true;
    }
  }

  getNameWithPrefixx(OS, Name, PrefixTy, *DL, UseAt);

  if (!MSFunc)
    return;

  // If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
  // add it.
  // fastcall and stdcall functions usually need @42 at the end to specify
  // the argument info.
  FunctionType *FT = MSFunc->getFunctionType();
  if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
      // "Pure" variadic functions do not receive @0 suffix.
      (!FT->isVarArg() || FT->getNumParams() == 0 ||
       (FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
    AddFastCallStdCallSuffix(OS, MSFunc, *DL);
}

/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
/// and the specified global variable's name.  If the global variable doesn't
/// have a name, this fills in a unique name for the global.
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
                                const GlobalValue *GV) {
  ManglerPrefixTy PrefixTy = Mangler::Default;
  if (GV->hasPrivateLinkage())
    PrefixTy = Mangler::Private;
  else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
    PrefixTy = Mangler::LinkerPrivate;
  
  // If this global has a name, handle it simply.
  if (GV->hasName()) {
    StringRef Name = GV->getName();
    getNameWithPrefix(OutName, Name, PrefixTy);
    // No need to do anything else if the global has the special "do not mangle"
    // flag in the name.
    if (Name[0] == 1)
      return;
  } else {
    // Get the ID for the global, assigning a new one if we haven't got one
    // already.
    unsigned &ID = AnonGlobalIDs[GV];
    if (ID == 0) ID = NextAnonGlobalID++;
  
    // Must mangle the global into a unique ID.
    getNameWithPrefix(OutName, "__unnamed_" + Twine(ID), PrefixTy);
  }

  // If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
  // add it.
  if (DL->hasMicrosoftFastStdCallMangling()) {
    if (const Function *F = dyn_cast<Function>(GV)) {
      CallingConv::ID CC = F->getCallingConv();
    
      // fastcall functions need to start with @.
      // FIXME: This logic seems unlikely to be right.
      if (CC == CallingConv::X86_FastCall) {
        if (OutName[0] == '_')
          OutName[0] = '@';
        else
          OutName.insert(OutName.begin(), '@');
      }
    
      // fastcall and stdcall functions usually need @42 at the end to specify
      // the argument info.
      FunctionType *FT = F->getFunctionType();
      if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
          // "Pure" variadic functions do not receive @0 suffix.
          (!FT->isVarArg() || FT->getNumParams() == 0 ||
           (FT->getNumParams() == 1 && F->hasStructRetAttr())))
        AddFastCallStdCallSuffix(OutName, F, *DL);
    }
  }
}

/// isFreeCall - Returns non-null if the value is a call to the builtin free()
static const CallInst* isFreeCall(const Value* I) {
    const CallInst* CI = dyn_cast<CallInst>(I);
    if (!CI)
        return 0;
    Function* Callee = CI->getCalledFunction();
    if (Callee == 0 || !Callee->isDeclaration())
        return 0;

    if (Callee->getName() != "free" /*&&
            Callee->getName() != "my_free" &&
            Callee->getName() != "_ZdlPv" && // operator delete(void*)
            Callee->getName() != "_ZdaPv"*/) // operator delete[](void*)
        return 0;

    // Check free prototype.
    // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
    // attribute will exist.
    FunctionType* FTy = Callee->getFunctionType();
    if (!FTy->getReturnType()->isVoidTy())
        return 0;
    if (FTy->getNumParams() != 1)
        return 0;
    if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
        return 0;

    return CI;
}

/// isFreeCall - Returns non-null if the value is a call to the builtin free()
const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
  const CallInst *CI = dyn_cast<CallInst>(I);
  if (!CI || isa<IntrinsicInst>(CI))
    return 0;
  Function *Callee = CI->getCalledFunction();
  if (Callee == 0 || !Callee->isDeclaration())
    return 0;

  StringRef FnName = Callee->getName();
  LibFunc::Func TLIFn;
  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
    return 0;

  if (TLIFn != LibFunc::free &&
      TLIFn != LibFunc::ZdlPv && // operator delete(void*)
      TLIFn != LibFunc::ZdaPv)   // operator delete[](void*)
    return 0;

  // Check free prototype.
  // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
  // attribute will exist.
  FunctionType *FTy = Callee->getFunctionType();
  if (!FTy->getReturnType()->isVoidTy())
    return 0;
  if (FTy->getNumParams() != 1)
    return 0;
  if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
    return 0;

  return CI;
}

void TypeDuplicater::RemoveNonLocalTypes(Module &M){
  std::set<Function *> UndefinedFunctions;
  for(auto IF = M.begin(), EF = M.end(); IF != EF; ++IF){
    Function *F = &*IF;

    if(F->isDeclaration())
      UndefinedFunctions.insert(F);
  }

  for(auto F: UndefinedFunctions){
    FunctionType *FuncType = cast<FunctionType>(F->getFunctionType());
    for(int i=0; i<FuncType->getNumParams(); i++){
      Type *T =FuncType->getParamType(i);

      while(T->isPointerTy())
        T = T->getPointerElementType();
      if(auto *ST = dyn_cast<StructType>(T))
        RawStructs.erase(ST);
    }

    Type *T =FuncType->getReturnType();
    while(T->isPointerTy())
      T = T->getPointerElementType();
    if(auto *ST = dyn_cast<StructType>(T))
      RawStructs.erase(ST);
  }
}

void Mapper::remapInstruction(Instruction *I) {
  // Remap operands.
  for (Use &Op : I->operands()) {
    Value *V = mapValue(Op);
    // If we aren't ignoring missing entries, assert that something happened.
    if (V)
      Op = V;
    else
      assert((Flags & RF_IgnoreMissingLocals) &&
             "Referenced value not in value map!");
  }

  // Remap phi nodes' incoming blocks.
  if (PHINode *PN = dyn_cast<PHINode>(I)) {
    for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
      Value *V = mapValue(PN->getIncomingBlock(i));
      // If we aren't ignoring missing entries, assert that something happened.
      if (V)
        PN->setIncomingBlock(i, cast<BasicBlock>(V));
      else
        assert((Flags & RF_IgnoreMissingLocals) &&
               "Referenced block not in value map!");
    }
  }

  // Remap attached metadata.
  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
  I->getAllMetadata(MDs);
  for (const auto &MI : MDs) {
    MDNode *Old = MI.second;
    MDNode *New = cast_or_null<MDNode>(mapMetadata(Old));
    if (New != Old)
      I->setMetadata(MI.first, New);
  }

  if (!TypeMapper)
    return;

  // If the instruction's type is being remapped, do so now.
  if (auto CS = CallSite(I)) {
    SmallVector<Type *, 3> Tys;
    FunctionType *FTy = CS.getFunctionType();
    Tys.reserve(FTy->getNumParams());
    for (Type *Ty : FTy->params())
      Tys.push_back(TypeMapper->remapType(Ty));
    CS.mutateFunctionType(FunctionType::get(
        TypeMapper->remapType(I->getType()), Tys, FTy->isVarArg()));
    return;
  }
  if (auto *AI = dyn_cast<AllocaInst>(I))
    AI->setAllocatedType(TypeMapper->remapType(AI->getAllocatedType()));
  if (auto *GEP = dyn_cast<GetElementPtrInst>(I)) {
    GEP->setSourceElementType(
        TypeMapper->remapType(GEP->getSourceElementType()));
    GEP->setResultElementType(
        TypeMapper->remapType(GEP->getResultElementType()));
  }
  I->mutateType(TypeMapper->remapType(I->getType()));
}

/// isFreeCall - Returns non-null if the value is a call to the builtin free()
const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
  bool IsNoBuiltinCall;
  const Function *Callee =
      getCalledFunction(I, /*LookThroughBitCast=*/false, IsNoBuiltinCall);
  if (Callee == nullptr || IsNoBuiltinCall)
    return nullptr;

  StringRef FnName = Callee->getName();
  LibFunc TLIFn;
  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
    return nullptr;

  unsigned ExpectedNumParams;
  if (TLIFn == LibFunc_free ||
      TLIFn == LibFunc_ZdlPv || // operator delete(void*)
      TLIFn == LibFunc_ZdaPv || // operator delete[](void*)
      TLIFn == LibFunc_msvc_delete_ptr32 || // operator delete(void*)
      TLIFn == LibFunc_msvc_delete_ptr64 || // operator delete(void*)
      TLIFn == LibFunc_msvc_delete_array_ptr32 || // operator delete[](void*)
      TLIFn == LibFunc_msvc_delete_array_ptr64)   // operator delete[](void*)
    ExpectedNumParams = 1;
  else if (TLIFn == LibFunc_ZdlPvj ||              // delete(void*, uint)
           TLIFn == LibFunc_ZdlPvm ||              // delete(void*, ulong)
           TLIFn == LibFunc_ZdlPvRKSt9nothrow_t || // delete(void*, nothrow)
           TLIFn == LibFunc_ZdlPvSt11align_val_t || // delete(void*, align_val_t)
           TLIFn == LibFunc_ZdaPvj ||              // delete[](void*, uint)
           TLIFn == LibFunc_ZdaPvm ||              // delete[](void*, ulong)
           TLIFn == LibFunc_ZdaPvRKSt9nothrow_t || // delete[](void*, nothrow)
           TLIFn == LibFunc_ZdaPvSt11align_val_t || // delete[](void*, align_val_t)
           TLIFn == LibFunc_msvc_delete_ptr32_int ||      // delete(void*, uint)
           TLIFn == LibFunc_msvc_delete_ptr64_longlong || // delete(void*, ulonglong)
           TLIFn == LibFunc_msvc_delete_ptr32_nothrow || // delete(void*, nothrow)
           TLIFn == LibFunc_msvc_delete_ptr64_nothrow || // delete(void*, nothrow)
           TLIFn == LibFunc_msvc_delete_array_ptr32_int ||      // delete[](void*, uint)
           TLIFn == LibFunc_msvc_delete_array_ptr64_longlong || // delete[](void*, ulonglong)
           TLIFn == LibFunc_msvc_delete_array_ptr32_nothrow || // delete[](void*, nothrow)
           TLIFn == LibFunc_msvc_delete_array_ptr64_nothrow)   // delete[](void*, nothrow)
    ExpectedNumParams = 2;
  else if (TLIFn == LibFunc_ZdaPvSt11align_val_tRKSt9nothrow_t || // delete(void*, align_val_t, nothrow)
           TLIFn == LibFunc_ZdlPvSt11align_val_tRKSt9nothrow_t) // delete[](void*, align_val_t, nothrow)
    ExpectedNumParams = 3;
  else
    return nullptr;

  // Check free prototype.
  // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
  // attribute will exist.
  FunctionType *FTy = Callee->getFunctionType();
  if (!FTy->getReturnType()->isVoidTy())
    return nullptr;
  if (FTy->getNumParams() != ExpectedNumParams)
    return nullptr;
  if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
    return nullptr;

  return dyn_cast<CallInst>(I);
}

/// RemapInstruction - Convert the instruction operands from referencing the
/// current values into those specified by VMap.
///
void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap,
                            RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
                            ValueMaterializer *Materializer){
  // Remap operands.
  for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
    Value *V = MapValue(*op, VMap, Flags, TypeMapper, Materializer);
    // If we aren't ignoring missing entries, assert that something happened.
    if (V)
      *op = V;
    else
      assert((Flags & RF_IgnoreMissingEntries) &&
             "Referenced value not in value map!");
  }

  // Remap phi nodes' incoming blocks.
  if (PHINode *PN = dyn_cast<PHINode>(I)) {
    for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
      Value *V = MapValue(PN->getIncomingBlock(i), VMap, Flags);
      // If we aren't ignoring missing entries, assert that something happened.
      if (V)
        PN->setIncomingBlock(i, cast<BasicBlock>(V));
      else
        assert((Flags & RF_IgnoreMissingEntries) &&
               "Referenced block not in value map!");
    }
  }

  // Remap attached metadata.
  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
  I->getAllMetadata(MDs);
  for (SmallVectorImpl<std::pair<unsigned, MDNode *>>::iterator
           MI = MDs.begin(),
           ME = MDs.end();
       MI != ME; ++MI) {
    MDNode *Old = MI->second;
    MDNode *New = MapMetadata(Old, VMap, Flags, TypeMapper, Materializer);
    if (New != Old)
      I->setMetadata(MI->first, New);
  }
  
  if (!TypeMapper)
    return;

  // If the instruction's type is being remapped, do so now.
  if (auto CS = CallSite(I)) {
    SmallVector<Type *, 3> Tys;
    FunctionType *FTy = CS.getFunctionType();
    Tys.reserve(FTy->getNumParams());
    for (Type *Ty : FTy->params())
      Tys.push_back(TypeMapper->remapType(Ty));
    CS.mutateFunctionType(FunctionType::get(
        TypeMapper->remapType(I->getType()), Tys, FTy->isVarArg()));
  } else
    I->mutateType(TypeMapper->remapType(I->getType()));
}

// We accept bswap for a limited set of types (i16, i32, i64).
// The various backends are able to generate instructions to
// implement the intrinsic.  Also, i16 and i64 are easy to
// implement as along as there is a way to do i32.
static bool isWhitelistedBswap(const Function *F) {
  FunctionType *FT = F->getFunctionType();
  if (FT->getNumParams() != 1)
    return false;
  Type *ParamType = FT->getParamType(0);
  LLVMContext &C = F->getContext();
  Type *AcceptableTypes[] = { Type::getInt16Ty(C),
                              Type::getInt32Ty(C),
                              Type::getInt64Ty(C) };
  return TypeAcceptable(ParamType, AcceptableTypes);
}

/// isFreeCall - Returns non-null if the value is a call to the builtin free()
const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
  const CallInst *CI = dyn_cast<CallInst>(I);
  if (!CI || isa<IntrinsicInst>(CI))
    return nullptr;
  Function *Callee = CI->getCalledFunction();
  if (Callee == nullptr)
    return nullptr;

  StringRef FnName = Callee->getName();
  LibFunc::Func TLIFn;
  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
    return nullptr;

  unsigned ExpectedNumParams;
  if (TLIFn == LibFunc::free ||
      TLIFn == LibFunc::ZdlPv || // operator delete(void*)
      TLIFn == LibFunc::ZdaPv || // operator delete[](void*)
      TLIFn == LibFunc::msvc_delete_ptr32 || // operator delete(void*)
      TLIFn == LibFunc::msvc_delete_ptr64 || // operator delete(void*)
      TLIFn == LibFunc::msvc_delete_array_ptr32 || // operator delete[](void*)
      TLIFn == LibFunc::msvc_delete_array_ptr64)   // operator delete[](void*)
    ExpectedNumParams = 1;
  else if (TLIFn == LibFunc::ZdlPvj ||              // delete(void*, uint)
           TLIFn == LibFunc::ZdlPvm ||              // delete(void*, ulong)
           TLIFn == LibFunc::ZdlPvRKSt9nothrow_t || // delete(void*, nothrow)
           TLIFn == LibFunc::ZdaPvj ||              // delete[](void*, uint)
           TLIFn == LibFunc::ZdaPvm ||              // delete[](void*, ulong)
           TLIFn == LibFunc::ZdaPvRKSt9nothrow_t || // delete[](void*, nothrow)
           TLIFn == LibFunc::msvc_delete_ptr32_int ||      // delete(void*, uint)
           TLIFn == LibFunc::msvc_delete_ptr64_longlong || // delete(void*, ulonglong)
           TLIFn == LibFunc::msvc_delete_ptr32_nothrow || // delete(void*, nothrow)
           TLIFn == LibFunc::msvc_delete_ptr64_nothrow || // delete(void*, nothrow)
           TLIFn == LibFunc::msvc_delete_array_ptr32_int ||      // delete[](void*, uint)
           TLIFn == LibFunc::msvc_delete_array_ptr64_longlong || // delete[](void*, ulonglong)
           TLIFn == LibFunc::msvc_delete_array_ptr32_nothrow || // delete[](void*, nothrow)
           TLIFn == LibFunc::msvc_delete_array_ptr64_nothrow)   // delete[](void*, nothrow)
    ExpectedNumParams = 2;
  else
    return nullptr;

  // Check free prototype.
  // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
  // attribute will exist.
  FunctionType *FTy = Callee->getFunctionType();
  if (!FTy->getReturnType()->isVoidTy())
    return nullptr;
  if (FTy->getNumParams() != ExpectedNumParams)
    return nullptr;
  if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
    return nullptr;

  return CI;
}

static void check(Value *Func, ArrayRef<Value *> Args) {
  FunctionType *FTy =
      cast<FunctionType>(cast<PointerType>(Func->getType())->getElementType());

  assert((Args.size() == FTy->getNumParams() ||
          (FTy->isVarArg() && Args.size() > FTy->getNumParams())) &&
         "XXCalling a function with bad signature!");

  for (unsigned i = 0; i != Args.size(); ++i) {
    if (!(FTy->getParamType(i) == Args[i]->getType())) {
      errs() << "types:\n  ";
      FTy->getParamType(i)->dump();
      errs() << "\n  ";
      Args[i]->getType()->dump();
      errs() << "\n";
    }
    assert((i >= FTy->getNumParams() ||
            FTy->getParamType(i) == Args[i]->getType()) &&
           "YYCalling a function with a bad signature!");
  }
}

/// \brief Returns the allocation data for the given value if it is a call to a
/// known allocation function, and NULL otherwise.
static const AllocFnsTy *getAllocationData(const Value *V, AllocType AllocTy,
                                           const TargetLibraryInfo *TLI,
                                           bool LookThroughBitCast = false) {
  // Skip all intrinsics but duetto.allocate
  if (const IntrinsicInst* II = dyn_cast<IntrinsicInst>(V))
  {
    if (II->getIntrinsicID() == Intrinsic::duetto_allocate)
      return &AllocationFnData[0];
    return 0;
  }

  Function *Callee = getCalledFunction(V, LookThroughBitCast);
  if (!Callee)
    return 0;

  // Make sure that the function is available.
  StringRef FnName = Callee->getName();
  LibFunc::Func TLIFn;
  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
    return 0;

  unsigned i = 0;
  bool found = false;
  for ( ; i < array_lengthof(AllocationFnData); ++i) {
    if (AllocationFnData[i].Func == TLIFn) {
      found = true;
      break;
    }
  }
  if (!found)
    return 0;

  const AllocFnsTy *FnData = &AllocationFnData[i];
  if ((FnData->AllocTy & AllocTy) != FnData->AllocTy)
    return 0;

  // Check function prototype.
  int FstParam = FnData->FstParam;
  int SndParam = FnData->SndParam;
  FunctionType *FTy = Callee->getFunctionType();

  if (FTy->getReturnType() == Type::getInt8PtrTy(FTy->getContext()) &&
      FTy->getNumParams() == FnData->NumParams &&
      (FstParam < 0 ||
       (FTy->getParamType(FstParam)->isIntegerTy(32) ||
        FTy->getParamType(FstParam)->isIntegerTy(64))) &&
      (SndParam < 0 ||
       FTy->getParamType(SndParam)->isIntegerTy(32) ||
       FTy->getParamType(SndParam)->isIntegerTy(64)))
    return FnData;
  return 0;
}

/// Creates a hash-code for the function which is the same for any two
/// functions that will compare equal, without looking at the instructions
/// inside the function.
static unsigned profileFunction(const Function *F) {
  FunctionType *FTy = F->getFunctionType();

  FoldingSetNodeID ID;
  ID.AddInteger(F->size());
  ID.AddInteger(F->getCallingConv());
  ID.AddBoolean(F->hasGC());
  ID.AddBoolean(FTy->isVarArg());
  ID.AddInteger(getTypeIDForHash(FTy->getReturnType()));
  for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
    ID.AddInteger(getTypeIDForHash(FTy->getParamType(i)));
  return ID.ComputeHash();
}

void Function::BuildLazyArguments() const {
  // Create the arguments vector, all arguments start out unnamed.
  FunctionType *FT = getFunctionType();
  for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
    assert(!FT->getParamType(i)->isVoidTy() &&
           "Cannot have void typed arguments!");
    ArgumentList.push_back(new Argument(FT->getParamType(i)));
  }
  
  // Clear the lazy arguments bit.
  unsigned SDC = getSubclassDataFromValue();
  const_cast<Function*>(this)->setValueSubclassData(SDC &= ~1);
}