//===-- llvm/SymbolTableListTraits.h - Traits for iplist --------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a generic class that is used to implement the automatic
// symbol table manipulation that occurs when you put (for example) a named
// instruction into a basic block.
//
// The way that this is implemented is by using a special traits class with the
// intrusive list that makes up the list of instructions in a basic block.  When
// a new element is added to the list of instructions, the traits class is
// notified, allowing the symbol table to be updated.
//
// This generic class implements the traits class.  It must be generic so that
// it can work for all uses it, which include lists of instructions, basic
// blocks, arguments, functions, global variables, etc...
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SYMBOLTABLELISTTRAITS_H
#define LLVM_SYMBOLTABLELISTTRAITS_H

namespace llvm {

template<typename NodeTy> class ilist_iterator;
template<typename NodeTy, typename Traits> class iplist;
template<typename Ty> struct ilist_traits;

// ValueSubClass  - The type of objects that I hold, e.g. Instruction.
// ItemParentType - The type of object that owns the list, e.g. BasicBlock.
// TraitBaseClass - The class this trait should inherit from, it should
//                  inherit from ilist_traits<ValueSubClass>
//
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits {
  typedef ilist_traits<ValueSubClass> TraitsClass;
public:
  SymbolTableListTraits() {}

  /// getListOwner - Return the object that owns this list.  If this is a list
  /// of instructions, it returns the BasicBlock that owns them.
  ItemParentClass *getListOwner() {
    return reinterpret_cast<ItemParentClass*>(reinterpret_cast<char*>(this)-
                                              TraitsClass::getListOffset());
  }
  static ValueSubClass *getPrev(ValueSubClass *V) { return V->getPrev(); }
  static ValueSubClass *getNext(ValueSubClass *V) { return V->getNext(); }
  static const ValueSubClass *getPrev(const ValueSubClass *V) {
    return V->getPrev();
  }
  static const ValueSubClass *getNext(const ValueSubClass *V) {
    return V->getNext();
  }

  static void setPrev(ValueSubClass *V, ValueSubClass *P) { V->setPrev(P); }
  static void setNext(ValueSubClass *V, ValueSubClass *N) { V->setNext(N); }

  void addNodeToList(ValueSubClass *V);
  void removeNodeFromList(ValueSubClass *V);
  void transferNodesFromList(iplist<ValueSubClass,
                             ilist_traits<ValueSubClass> > &L2,
                             ilist_iterator<ValueSubClass> first,
                             ilist_iterator<ValueSubClass> last);
//private:
  template<typename TPtr>
  void setSymTabObject(TPtr *, TPtr);
};

} // End llvm namespace

#endif