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 23 /** \class GCFactoryListTraits 24 * \brief GCFactoryListTraits provides trait class for llvm::iplist when 25 * the nodes in the list is produced by GCFactory. 26 */ 27 template<typename DataType> 28 class GCFactoryListTraits : public llvm::ilist_default_traits<DataType> { 29 private: 30 class SentinelNode : public llvm::ilist_node<DataType> { 31 public: 32 SentinelNode() : llvm::ilist_node<DataType>() { } 33 }; 34 35 public: 36 // override the traits provided in llvm::ilist_sentinel_traits since we've 37 // defined our own sentinel. 38 DataType *createSentinel() const 39 { return reinterpret_cast<DataType*>(&mSentinel); } 40 41 static void destroySentinel(DataType*) { } 42 43 DataType *provideInitialHead() const 44 { return createSentinel(); } 45 46 DataType *ensureHead(DataType*) const 47 { return createSentinel(); } 48 49 static void noteHead(DataType*, DataType*) { } 50 51 // override the traits provided in llvm::ilist_node_traits since 52 static DataType *createNode(const DataType &V) { 53 assert(false && "Only GCFactory knows how to create a node."); 54 } 55 static void deleteNode(DataType *V) { 56 // No action. GCFactory will handle it by itself. 57 } 58 59 private: 60 mutable SentinelNode mSentinel; 61 }; 62 63 } // namespace of mcld 64 65 #endif 66
