1 //===- GCFactoryListTraits.h ----------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_GC_FACTORY_LIST_TRAITS_H 10 #define MCLD_GC_FACTORY_LIST_TRAITS_H 11 #ifdef ENABLE_UNITTEST 12 #include <gtest.h> 13 #endif 14 15 #include <llvm/ADT/ilist_node.h> 16 #include <llvm/ADT/ilist.h> 17 18 #include <assert.h> 19 20 namespace mcld { 21 22 /** \class GCFactoryListTraits 23 * \brief GCFactoryListTraits provides trait class for llvm::iplist when 24 * the nodes in the list is produced by GCFactory. 25 */ 26 template<typename DataType> 27 class GCFactoryListTraits : public llvm::ilist_default_traits<DataType> 28 { 29 private: 30 class SentinelNode : public DataType 31 { 32 public: 33 SentinelNode() { } 34 }; 35 36 public: 37 // override the traits provided in llvm::ilist_sentinel_traits since we've 38 // defined our own sentinel. 39 DataType *createSentinel() const 40 { return reinterpret_cast<DataType*>(&mSentinel); } 41 42 static void destroySentinel(DataType*) { } 43 44 DataType *provideInitialHead() const 45 { return createSentinel(); } 46 47 DataType *ensureHead(DataType*) const 48 { return createSentinel(); } 49 50 static void noteHead(DataType*, DataType*) { } 51 52 // override the traits provided in llvm::ilist_node_traits since 53 static DataType *createNode(const DataType &V) { 54 assert(false && "Only GCFactory knows how to create a node."); 55 } 56 static void deleteNode(DataType *V) { 57 // No action. GCFactory will handle it by itself. 58 } 59 60 private: 61 mutable SentinelNode mSentinel; 62 }; 63 64 } // namespace of mcld 65 66 #endif 67
