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//===-- 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
#include "llvm/ADT/ilist.h"
namespace llvm {
class ValueSymbolTable;
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.
// ItemParentClass - The type of object that owns the list, e.g. BasicBlock.
//
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits : public ilist_default_traits<ValueSubClass> {
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() {
typedef iplist<ValueSubClass> ItemParentClass::*Sublist;
size_t Offset(size_t(&((ItemParentClass*)0->*ItemParentClass::
getSublistAccess(static_cast<ValueSubClass*>(0)))));
iplist<ValueSubClass>* Anchor(static_cast<iplist<ValueSubClass>*>(this));
return reinterpret_cast<ItemParentClass*>(reinterpret_cast<char*>(Anchor)-
Offset);
}
static iplist<ValueSubClass> &getList(ItemParentClass *Par) {
return Par->*(Par->getSublistAccess((ValueSubClass*)0));
}
static ValueSymbolTable *getSymTab(ItemParentClass *Par) {
return Par ? toPtr(Par->getValueSymbolTable()) : 0;
}
void addNodeToList(ValueSubClass *V);
void removeNodeFromList(ValueSubClass *V);
void transferNodesFromList(ilist_traits<ValueSubClass> &L2,
ilist_iterator<ValueSubClass> first,
ilist_iterator<ValueSubClass> last);
//private:
template<typename TPtr>
void setSymTabObject(TPtr *, TPtr);
static ValueSymbolTable *toPtr(ValueSymbolTable *P) { return P; }
static ValueSymbolTable *toPtr(ValueSymbolTable &R) { return &R; }
};
} // End llvm namespace
#endif
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