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
13using namespace mcld;
14
15//===----------------------------------------------------------------------===//
16// NamePool
17//===----------------------------------------------------------------------===//
18NamePool::NamePool(NamePool::size_type pSize)
19  : m_pResolver(new StaticResolver()), m_Table(pSize) {
20}
21
22NamePool::~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
33ResolveInfo* 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?
56void 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                              LDSymbol::ValueType pValue,
63                              ResolveInfo::Visibility pVisibility,
64                              ResolveInfo* pOldInfo,
65                              Resolver::Result& pResult)
66{
67  // We should check if there is any symbol with the same name existed.
68  // If it already exists, we should use resolver to decide which symbol
69  // should be reserved. Otherwise, we insert the symbol and set up its
70  // attributes.
71  bool exist = false;
72  ResolveInfo* old_symbol = m_Table.insert(pName, exist);
73  ResolveInfo* new_symbol = NULL;
74  if (exist && old_symbol->isSymbol()) {
75    new_symbol = m_Table.getEntryFactory().produce(pName);
76  }
77  else {
78    exist = false;
79    new_symbol = old_symbol;
80  }
81
82  new_symbol->setIsSymbol(true);
83  new_symbol->setSource(pIsDyn);
84  new_symbol->setType(pType);
85  new_symbol->setDesc(pDesc);
86  new_symbol->setBinding(pBinding);
87  new_symbol->setVisibility(pVisibility);
88  new_symbol->setSize(pSize);
89
90  if (!exist) {
91    // old_symbol is neither existed nor a symbol.
92    pResult.info      = new_symbol;
93    pResult.existent  = false;
94    pResult.overriden = true;
95    return;
96  }
97  else if (NULL != pOldInfo) {
98    // existent, remember its attribute
99    pOldInfo->override(*old_symbol);
100  }
101
102  // exist and is a symbol
103  // symbol resolution
104  bool override = false;
105  unsigned int action = Resolver::LastAction;
106  if (m_pResolver->resolve(*old_symbol, *new_symbol, override, pValue)) {
107    pResult.info      = old_symbol;
108    pResult.existent  = true;
109    pResult.overriden = override;
110  }
111  else {
112      m_pResolver->resolveAgain(*this, action, *old_symbol, *new_symbol, pResult);
113  }
114
115  m_Table.getEntryFactory().destroy(new_symbol);
116  return;
117}
118
119llvm::StringRef NamePool::insertString(const llvm::StringRef& pString)
120{
121  bool exist = false;
122  ResolveInfo* resolve_info = m_Table.insert(pString, exist);
123  return llvm::StringRef(resolve_info->name(), resolve_info->nameSize());
124}
125
126void NamePool::reserve(NamePool::size_type pSize)
127{
128  m_Table.rehash(pSize);
129}
130
131NamePool::size_type NamePool::capacity() const
132{
133  return (m_Table.numOfBuckets() - m_Table.numOfEntries());
134}
135
136/// findInfo - find the resolved ResolveInfo
137ResolveInfo* NamePool::findInfo(const llvm::StringRef& pName)
138{
139  Table::iterator iter = m_Table.find(pName);
140  return iter.getEntry();
141}
142
143/// findInfo - find the resolved ResolveInfo
144const ResolveInfo* NamePool::findInfo(const llvm::StringRef& pName) const
145{
146  Table::const_iterator iter = m_Table.find(pName);
147  return iter.getEntry();
148}
149
150/// findSymbol - find the resolved output LDSymbol
151LDSymbol* NamePool::findSymbol(const llvm::StringRef& pName)
152{
153  ResolveInfo* info = findInfo(pName);
154  if (NULL == info)
155    return NULL;
156  return info->outSymbol();
157}
158
159/// findSymbol - find the resolved output LDSymbol
160const LDSymbol* NamePool::findSymbol(const llvm::StringRef& pName) const
161{
162  const ResolveInfo* info = findInfo(pName);
163  if (NULL == info)
164    return NULL;
165  return info->outSymbol();
166}
167
168