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 //===----------------------------------------------------------------------===//
NamePool(NamePool::size_type pSize)18 NamePool::NamePool(NamePool::size_type pSize)
19 : m_pResolver(new StaticResolver()), m_Table(pSize) {
20 }
21
~NamePool()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
createSymbol(const llvm::StringRef & pName,bool pIsDyn,ResolveInfo::Type pType,ResolveInfo::Desc pDesc,ResolveInfo::Binding pBinding,ResolveInfo::SizeType pSize,ResolveInfo::Visibility pVisibility)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?
insertSymbol(const llvm::StringRef & pName,bool pIsDyn,ResolveInfo::Type pType,ResolveInfo::Desc pDesc,ResolveInfo::Binding pBinding,ResolveInfo::SizeType pSize,ResolveInfo::Visibility pVisibility,ResolveInfo * pOldInfo,Resolver::Result & pResult)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
insertString(const llvm::StringRef & pString)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
reserve(NamePool::size_type pSize)125 void NamePool::reserve(NamePool::size_type pSize)
126 {
127 m_Table.rehash(pSize);
128 }
129
capacity() const130 NamePool::size_type NamePool::capacity() const
131 {
132 return (m_Table.numOfBuckets() - m_Table.numOfEntries());
133 }
134
135 /// findInfo - find the resolved ResolveInfo
findInfo(const llvm::StringRef & pName)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
findInfo(const llvm::StringRef & pName) const143 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
findSymbol(const llvm::StringRef & pName)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
findSymbol(const llvm::StringRef & pName) const159 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