1 //===- LDSymbol.cpp -------------------------------------------------------===// 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 #include <mcld/LD/LDSymbol.h> 10 11 #include <mcld/Config/Config.h> 12 #include <mcld/Fragment/FragmentRef.h> 13 #include <mcld/Fragment/NullFragment.h> 14 #include <mcld/Support/GCFactory.h> 15 16 #include <cstring> 17 18 #include <llvm/Support/ManagedStatic.h> 19 20 using namespace mcld; 21 22 typedef GCFactory<LDSymbol, MCLD_SYMBOLS_PER_INPUT> LDSymbolFactory; 23 24 static llvm::ManagedStatic<LDSymbol> g_NullSymbol; 25 static llvm::ManagedStatic<NullFragment> g_NullSymbolFragment; 26 static llvm::ManagedStatic<LDSymbolFactory> g_LDSymbolFactory; 27 28 //===----------------------------------------------------------------------===// 29 // LDSymbol 30 //===----------------------------------------------------------------------===// LDSymbol()31LDSymbol::LDSymbol() 32 : m_pResolveInfo(NULL), m_pFragRef(NULL), m_Value(0) { 33 } 34 ~LDSymbol()35LDSymbol::~LDSymbol() 36 { 37 } 38 LDSymbol(const LDSymbol & pCopy)39LDSymbol::LDSymbol(const LDSymbol& pCopy) 40 : m_pResolveInfo(pCopy.m_pResolveInfo), 41 m_pFragRef(pCopy.m_pFragRef), 42 m_Value(pCopy.m_Value) { 43 } 44 operator =(const LDSymbol & pCopy)45LDSymbol& LDSymbol::operator=(const LDSymbol& pCopy) 46 { 47 m_pResolveInfo = pCopy.m_pResolveInfo; 48 m_pFragRef = pCopy.m_pFragRef; 49 m_Value = pCopy.m_Value; 50 return (*this); 51 } 52 Create(ResolveInfo & pResolveInfo)53LDSymbol* LDSymbol::Create(ResolveInfo& pResolveInfo) 54 { 55 LDSymbol* result = g_LDSymbolFactory->allocate(); 56 new (result) LDSymbol(); 57 result->setResolveInfo(pResolveInfo); 58 return result; 59 } 60 Destroy(LDSymbol * & pSymbol)61void LDSymbol::Destroy(LDSymbol*& pSymbol) 62 { 63 pSymbol->~LDSymbol(); 64 g_LDSymbolFactory->deallocate(pSymbol); 65 pSymbol = NULL; 66 } 67 Clear()68void LDSymbol::Clear() 69 { 70 g_LDSymbolFactory->clear(); 71 } 72 Null()73LDSymbol* LDSymbol::Null() 74 { 75 // lazy initialization 76 if (NULL == g_NullSymbol->resolveInfo()) { 77 g_NullSymbol->setResolveInfo(*ResolveInfo::Null()); 78 g_NullSymbol->setFragmentRef(FragmentRef::Create(*g_NullSymbolFragment, 0)); 79 ResolveInfo::Null()->setSymPtr(&*g_NullSymbol); 80 } 81 return &*g_NullSymbol; 82 } 83 setFragmentRef(FragmentRef * pFragmentRef)84void LDSymbol::setFragmentRef(FragmentRef* pFragmentRef) 85 { 86 m_pFragRef = pFragmentRef; 87 } 88 setResolveInfo(const ResolveInfo & pInfo)89void LDSymbol::setResolveInfo(const ResolveInfo& pInfo) 90 { 91 m_pResolveInfo = const_cast<ResolveInfo*>(&pInfo); 92 } 93 isNull() const94bool LDSymbol::isNull() const 95 { 96 return (this == Null()); 97 } 98 hasFragRef() const99bool LDSymbol::hasFragRef() const 100 { 101 return !m_pFragRef->isNull(); 102 } 103 104