1 //===- NamePool.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 <llvm/Support/raw_ostream.h> 10 #include <mcld/LD/NamePool.h> 11 #include <mcld/LD/StaticResolver.h> 12 13 using namespace mcld; 14 15 //===----------------------------------------------------------------------===// 16 // NamePool 17 //===----------------------------------------------------------------------===// 18 NamePool::NamePool(NamePool::size_type pSize) 19 : m_pResolver(new StaticResolver()), m_Table(pSize) { 20 } 21 22 NamePool::~NamePool() 23 { 24 delete m_pResolver; 25 26 FreeInfoSet::iterator info, iEnd = m_FreeInfoSet.end(); 27 for (info = m_FreeInfoSet.begin(); info != iEnd; ++info) { 28 ResolveInfo::Destroy(*info); 29 } 30 } 31 32 /// createSymbol - create a symbol 33 ResolveInfo* NamePool::createSymbol(const llvm::StringRef& pName, 34 bool pIsDyn, 35 ResolveInfo::Type pType, 36 ResolveInfo::Desc pDesc, 37 ResolveInfo::Binding pBinding, 38 ResolveInfo::SizeType pSize, 39 ResolveInfo::Visibility pVisibility) 40 { 41 ResolveInfo** result = m_FreeInfoSet.allocate(); 42 (*result) = ResolveInfo::Create(pName); 43 (*result)->setIsSymbol(true); 44 (*result)->setSource(pIsDyn); 45 (*result)->setType(pType); 46 (*result)->setDesc(pDesc); 47 (*result)->setBinding(pBinding); 48 (*result)->setVisibility(pVisibility); 49 (*result)->setSize(pSize); 50 return *result; 51 } 52 53 /// insertSymbol - insert a symbol and resolve it immediately 54 /// @return the pointer of resolved ResolveInfo 55 /// @return is the symbol existent? 56 void NamePool::insertSymbol(const llvm::StringRef& pName, 57 bool pIsDyn, 58 ResolveInfo::Type pType, 59 ResolveInfo::Desc pDesc, 60 ResolveInfo::Binding pBinding, 61 ResolveInfo::SizeType pSize, 62 ResolveInfo::Visibility pVisibility, 63 ResolveInfo* pOldInfo, 64 Resolver::Result& pResult) 65 { 66 // We should check if there is any symbol with the same name existed. 67 // If it already exists, we should use resolver to decide which symbol 68 // should be reserved. Otherwise, we insert the symbol and set up its 69 // attributes. 70 bool exist = false; 71 ResolveInfo* old_symbol = m_Table.insert(pName, exist); 72 ResolveInfo* new_symbol = NULL; 73 if (exist && old_symbol->isSymbol()) { 74 new_symbol = m_Table.getEntryFactory().produce(pName); 75 } 76 else { 77 exist = false; 78 new_symbol = old_symbol; 79 } 80 81 new_symbol->setIsSymbol(true); 82 new_symbol->setSource(pIsDyn); 83 new_symbol->setType(pType); 84 new_symbol->setDesc(pDesc); 85 new_symbol->setBinding(pBinding); 86 new_symbol->setVisibility(pVisibility); 87 new_symbol->setSize(pSize); 88 89 if (!exist) { 90 // old_symbol is neither existed nor a symbol. 91 pResult.info = new_symbol; 92 pResult.existent = false; 93 pResult.overriden = true; 94 return; 95 } 96 else if (NULL != pOldInfo) { 97 // existent, remember its attribute 98 pOldInfo->override(*old_symbol); 99 } 100 101 // exist and is a symbol 102 // symbol resolution 103 bool override = false; 104 unsigned int action = Resolver::LastAction; 105 if (m_pResolver->resolve(*old_symbol, *new_symbol, override)) { 106 pResult.info = old_symbol; 107 pResult.existent = true; 108 pResult.overriden = override; 109 } 110 else { 111 m_pResolver->resolveAgain(*this, action, *old_symbol, *new_symbol, pResult); 112 } 113 114 m_Table.getEntryFactory().destroy(new_symbol); 115 return; 116 } 117 118 llvm::StringRef NamePool::insertString(const llvm::StringRef& pString) 119 { 120 bool exist = false; 121 ResolveInfo* resolve_info = m_Table.insert(pString, exist); 122 return llvm::StringRef(resolve_info->name(), resolve_info->nameSize()); 123 } 124 125 void NamePool::reserve(NamePool::size_type pSize) 126 { 127 m_Table.rehash(pSize); 128 } 129 130 NamePool::size_type NamePool::capacity() const 131 { 132 return (m_Table.numOfBuckets() - m_Table.numOfEntries()); 133 } 134 135 /// findInfo - find the resolved ResolveInfo 136 ResolveInfo* NamePool::findInfo(const llvm::StringRef& pName) 137 { 138 Table::iterator iter = m_Table.find(pName); 139 return iter.getEntry(); 140 } 141 142 /// findInfo - find the resolved ResolveInfo 143 const ResolveInfo* NamePool::findInfo(const llvm::StringRef& pName) const 144 { 145 Table::const_iterator iter = m_Table.find(pName); 146 return iter.getEntry(); 147 } 148 149 /// findSymbol - find the resolved output LDSymbol 150 LDSymbol* NamePool::findSymbol(const llvm::StringRef& pName) 151 { 152 ResolveInfo* info = findInfo(pName); 153 if (NULL == info) 154 return NULL; 155 return info->outSymbol(); 156 } 157 158 /// findSymbol - find the resolved output LDSymbol 159 const LDSymbol* NamePool::findSymbol(const llvm::StringRef& pName) const 160 { 161 const ResolveInfo* info = findInfo(pName); 162 if (NULL == info) 163 return NULL; 164 return info->outSymbol(); 165 } 166 167
