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81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
//===-- llvm/SymbolTableListTraits.h - Traits for iplist --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a generic class that is used to implement the automatic
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// symbol table manipulation that occurs when you put (for example) a named
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// instruction into a basic block.
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//
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// The way that this is implemented is by using a special traits class with the
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// intrusive list that makes up the list of instructions in a basic block. When
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// a new element is added to the list of instructions, the traits class is
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// notified, allowing the symbol table to be updated.
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//
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// This generic class implements the traits class. It must be generic so that
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// it can work for all uses it, which include lists of instructions, basic
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// blocks, arguments, functions, global variables, etc...
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYMBOLTABLELISTTRAITS_H
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#define LLVM_SYMBOLTABLELISTTRAITS_H
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#include "llvm/ADT/ilist.h"
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namespace llvm {
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class ValueSymbolTable;
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template<typename NodeTy> class ilist_iterator;
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template<typename NodeTy, typename Traits> class iplist;
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template<typename Ty> struct ilist_traits;
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// ValueSubClass - The type of objects that I hold, e.g. Instruction.
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// ItemParentClass - The type of object that owns the list, e.g. BasicBlock.
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//
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits : public ilist_default_traits<ValueSubClass> {
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typedef ilist_traits<ValueSubClass> TraitsClass;
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public:
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SymbolTableListTraits() {}
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/// getListOwner - Return the object that owns this list. If this is a list
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/// of instructions, it returns the BasicBlock that owns them.
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ItemParentClass *getListOwner() {
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typedef iplist<ValueSubClass> ItemParentClass::*Sublist;
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Sublist Sub(ItemParentClass::
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getSublistAccess(static_cast<ValueSubClass*>(0)));
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size_t Offset(size_t(&((ItemParentClass*)0->*Sub)));
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iplist<ValueSubClass>* Anchor(static_cast<iplist<ValueSubClass>*>(this));
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return reinterpret_cast<ItemParentClass*>(reinterpret_cast<char*>(Anchor)-
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Offset);
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}
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static iplist<ValueSubClass> &getList(ItemParentClass *Par) {
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return Par->*(Par->getSublistAccess((ValueSubClass*)0));
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}
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static ValueSymbolTable *getSymTab(ItemParentClass *Par) {
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return Par ? toPtr(Par->getValueSymbolTable()) : 0;
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}
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void addNodeToList(ValueSubClass *V);
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void removeNodeFromList(ValueSubClass *V);
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void transferNodesFromList(ilist_traits<ValueSubClass> &L2,
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ilist_iterator<ValueSubClass> first,
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ilist_iterator<ValueSubClass> last);
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//private:
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template<typename TPtr>
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void setSymTabObject(TPtr *, TPtr);
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static ValueSymbolTable *toPtr(ValueSymbolTable *P) { return P; }
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static ValueSymbolTable *toPtr(ValueSymbolTable &R) { return &R; }
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};
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} // End llvm namespace
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#endif
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