src/ld/SymbolTable.h

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-*
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   3  * Copyright (c) 2009 Apple Inc. All rights reserved.
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  24
  25 #ifndef __SYMBOL_TABLE_H__
  26 #define __SYMBOL_TABLE_H__
  27
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <sys/mman.h>
  32 #include <sys/sysctl.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <unistd.h>
  37 #include <mach/mach_time.h>
  38 #include <mach/vm_statistics.h>
  39 #include <mach/mach_init.h>
  40 #include <mach/mach_host.h>
  41 #include <dlfcn.h>
  42 #include <mach-o/dyld.h>
  43
  44 #include <vector>
  45 #include <ext/hash_map>
  46
  47 #include "Options.h"
  48 #include "ld.hpp"
  49
  50 namespace ld {
  51 namespace tool {
  52
  53
  54 class SymbolTable : public ld::IndirectBindingTable
  55 {
  56 public:
  57         typedef uint32_t IndirectBindingSlot;
  58
  59 private:
  60         class CStringEquals {
  61         public:
  62                 bool operator()(const char* left, const char* right) const { return (strcmp(left, right) == 0); }
  63         };
  64         typedef __gnu_cxx::hash_map<const char*, IndirectBindingSlot, __gnu_cxx::hash<const char*>, CStringEquals> NameToSlot;
  65
  66         class ContentFuncs {
  67         public:
  68                 size_t  operator()(const ld::Atom*) const;
  69                 bool    operator()(const ld::Atom* left, const ld::Atom* right) const;
  70         };
  71         typedef __gnu_cxx::hash_map<const ld::Atom*, IndirectBindingSlot, ContentFuncs, ContentFuncs> ContentToSlot;
  72
  73         class ReferencesHashFuncs {
  74         public:
  75                 size_t  operator()(const ld::Atom*) const;
  76                 bool    operator()(const ld::Atom* left, const ld::Atom* right) const;
  77         };
  78         typedef __gnu_cxx::hash_map<const ld::Atom*, IndirectBindingSlot, ReferencesHashFuncs, ReferencesHashFuncs> ReferencesToSlot;
  79
  80         class CStringHashFuncs {
  81         public:
  82                 size_t  operator()(const ld::Atom*) const;
  83                 bool    operator()(const ld::Atom* left, const ld::Atom* right) const;
  84         };
  85         typedef __gnu_cxx::hash_map<const ld::Atom*, IndirectBindingSlot, CStringHashFuncs, CStringHashFuncs> CStringToSlot;
  86
  87         class UTF16StringHashFuncs {
  88         public:
  89                 size_t  operator()(const ld::Atom*) const;
  90                 bool    operator()(const ld::Atom* left, const ld::Atom* right) const;
  91         };
  92         typedef __gnu_cxx::hash_map<const ld::Atom*, IndirectBindingSlot, UTF16StringHashFuncs, UTF16StringHashFuncs> UTF16StringToSlot;
  93
  94         typedef std::map<IndirectBindingSlot, const char*> SlotToName;
  95         typedef __gnu_cxx::hash_map<const char*, CStringToSlot*, __gnu_cxx::hash<const char*>, CStringEquals> NameToMap;
  96
  97 public:
  98
  99         class byNameIterator {
 100         public:
 101                 byNameIterator&                 operator++(int) { ++_nameTableIterator; return *this; }
 102                 const ld::Atom*                 operator*() { return _slotTable[_nameTableIterator->second]; }
 103                 bool                                    operator!=(const byNameIterator& lhs) { return _nameTableIterator != lhs._nameTableIterator; }
 104
 105         private:
 106                 friend class SymbolTable;
 107                                                                 byNameIterator(NameToSlot::iterator it, std::vector<const ld::Atom*>& indirectTable)
 108                                                                         : _nameTableIterator(it), _slotTable(indirectTable) {}
 109
 110                 NameToSlot::iterator                    _nameTableIterator;
 111                 std::vector<const ld::Atom*>&   _slotTable;
 112         };
 113
 114                                                 SymbolTable(const Options& opts, std::vector<const ld::Atom*>& ibt);
 115
 116         bool                            add(const ld::Atom& atom, bool ignoreDuplicates);
 117         IndirectBindingSlot     findSlotForName(const char* name);
 118         IndirectBindingSlot     findSlotForContent(const ld::Atom* atom, const ld::Atom** existingAtom);
 119         IndirectBindingSlot     findSlotForReferences(const ld::Atom* atom, const ld::Atom** existingAtom);
 120         const ld::Atom*         atomForSlot(IndirectBindingSlot s)      { return _indirectBindingTable[s]; }
 121         unsigned int            updateCount()                                           { return _indirectBindingTable.size(); }
 122         void                            undefines(std::vector<const char*>& undefines);
 123         void                            tentativeDefs(std::vector<const char*>& undefines);
 124         bool                            hasName(const char* name);
 125         bool                            hasExternalTentativeDefinitions()       { return _hasExternalTentativeDefinitions; }
 126         byNameIterator          begin()                                                         { return byNameIterator(_byNameTable.begin(),_indirectBindingTable); }
 127         byNameIterator          end()                                                           { return byNameIterator(_byNameTable.end(),_indirectBindingTable); }
 128         void                            printStatistics();
 129         static const char*              demangle(const char* sym);
 130
 131         // from ld::IndirectBindingTable
 132         virtual const char*                     indirectName(IndirectBindingSlot slot) const;
 133         virtual const ld::Atom*         indirectAtom(IndirectBindingSlot slot) const;
 134
 135 private:
 136         bool                                    addByName(const ld::Atom& atom, bool ignoreDuplicates);
 137         bool                                    addByContent(const ld::Atom& atom);
 138         bool                                    addByReferences(const ld::Atom& atom);
 139         void                                    markCoalescedAway(const ld::Atom* atom);
 140
 141         const Options&                                  _options;
 142         NameToSlot                                              _byNameTable;
 143         SlotToName                                              _byNameReverseTable;
 144         ContentToSlot                                   _literal4Table;
 145         ContentToSlot                                   _literal8Table;
 146         ContentToSlot                                   _literal16Table;
 147         UTF16StringToSlot                               _utf16Table;
 148         CStringToSlot                                   _cstringTable;
 149         NameToMap                                               _nonStdCStringSectionToMap;
 150         ReferencesToSlot                                _nonLazyPointerTable;
 151         ReferencesToSlot                                _cfStringTable;
 152         ReferencesToSlot                                _objc2ClassRefTable;
 153         ReferencesToSlot                                _pointerToCStringTable;
 154         std::vector<const ld::Atom*>&   _indirectBindingTable;
 155         bool                                                    _hasExternalTentativeDefinitions;
 156
 157         static bool                                             _s_doDemangle;
 158
 159 };
 160
 161 } // namespace tool
 162 } // namespace ld
 163
 164
 165 #endif // __SYMBOL_TABLE_H__