aboutsummaryrefslogtreecommitdiffstats
path: root/include/llvm/Object/SymbolicFile.h
blob: f7b7cb422dd6a680710f034eb3e907cc1eaa8fce (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
//===- SymbolicFile.h - Interface that only provides symbols ----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolicFile interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_OBJECT_SYMBOLICFILE_H
#define LLVM_OBJECT_SYMBOLICFILE_H

#include "llvm/Object/Binary.h"

namespace llvm {
namespace object {

union DataRefImpl {
  // This entire union should probably be a
  // char[max(8, sizeof(uintptr_t))] and require the impl to cast.
  struct {
    uint32_t a, b;
  } d;
  uintptr_t p;
  DataRefImpl() { std::memset(this, 0, sizeof(DataRefImpl)); }
};

inline bool operator==(const DataRefImpl &a, const DataRefImpl &b) {
  // Check bitwise identical. This is the only legal way to compare a union w/o
  // knowing which member is in use.
  return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
}

inline bool operator!=(const DataRefImpl &a, const DataRefImpl &b) {
  return !operator==(a, b);
}

inline bool operator<(const DataRefImpl &a, const DataRefImpl &b) {
  // Check bitwise identical. This is the only legal way to compare a union w/o
  // knowing which member is in use.
  return std::memcmp(&a, &b, sizeof(DataRefImpl)) < 0;
}

template <class content_type> class content_iterator {
  content_type Current;

public:
  content_iterator(content_type symb) : Current(symb) {}

  const content_type *operator->() const { return &Current; }

  const content_type &operator*() const { return Current; }

  bool operator==(const content_iterator &other) const {
    return Current == other.Current;
  }

  bool operator!=(const content_iterator &other) const {
    return !(*this == other);
  }

  content_iterator &operator++() { // preincrement
    Current.moveNext();
    return *this;
  }
};

class SymbolicFile;

/// This is a value type class that represents a single symbol in the list of
/// symbols in the object file.
class BasicSymbolRef {
  DataRefImpl SymbolPimpl;
  const SymbolicFile *OwningObject;

public:
  // FIXME: should we add a SF_Text?
  enum Flags : unsigned {
    SF_None = 0,
    SF_Undefined = 1U << 0,      // Symbol is defined in another object file
    SF_Global = 1U << 1,         // Global symbol
    SF_Weak = 1U << 2,           // Weak symbol
    SF_Absolute = 1U << 3,       // Absolute symbol
    SF_Common = 1U << 4,         // Symbol has common linkage
    SF_Indirect = 1U << 5,       // Symbol is an alias to another symbol
    SF_Exported = 1U << 6,       // Symbol is visible to other DSOs
    SF_FormatSpecific = 1U << 7, // Specific to the object file format
                                 // (e.g. section symbols)
    SF_Thumb = 1U << 8,          // Thumb symbol in a 32-bit ARM binary
  };

  BasicSymbolRef() : OwningObject(nullptr) { }
  BasicSymbolRef(DataRefImpl SymbolP, const SymbolicFile *Owner);

  bool operator==(const BasicSymbolRef &Other) const;
  bool operator<(const BasicSymbolRef &Other) const;

  void moveNext();

  std::error_code printName(raw_ostream &OS) const;

  /// Get symbol flags (bitwise OR of SymbolRef::Flags)
  uint32_t getFlags() const;

  DataRefImpl getRawDataRefImpl() const;
  const SymbolicFile *getObject() const;
};

typedef content_iterator<BasicSymbolRef> basic_symbol_iterator;

const uint64_t UnknownAddressOrSize = ~0ULL;

class SymbolicFile : public Binary {
public:
  virtual ~SymbolicFile();
  SymbolicFile(unsigned int Type, MemoryBufferRef Source);

  // virtual interface.
  virtual void moveSymbolNext(DataRefImpl &Symb) const = 0;

  virtual std::error_code printSymbolName(raw_ostream &OS,
                                          DataRefImpl Symb) const = 0;

  virtual uint32_t getSymbolFlags(DataRefImpl Symb) const = 0;

  virtual basic_symbol_iterator symbol_begin_impl() const = 0;

  virtual basic_symbol_iterator symbol_end_impl() const = 0;

  // convenience wrappers.
  basic_symbol_iterator symbol_begin() const {
    return symbol_begin_impl();
  }
  basic_symbol_iterator symbol_end() const {
    return symbol_end_impl();
  }
  typedef iterator_range<basic_symbol_iterator> basic_symbol_iterator_range;
  basic_symbol_iterator_range symbols() const {
    return basic_symbol_iterator_range(symbol_begin(), symbol_end());
  }

  // construction aux.
  static ErrorOr<std::unique_ptr<SymbolicFile>>
  createSymbolicFile(MemoryBufferRef Object, sys::fs::file_magic Type,
                     LLVMContext *Context);

  static ErrorOr<std::unique_ptr<SymbolicFile>>
  createSymbolicFile(MemoryBufferRef Object) {
    return createSymbolicFile(Object, sys::fs::file_magic::unknown, nullptr);
  }
  static ErrorOr<OwningBinary<SymbolicFile>>
  createSymbolicFile(StringRef ObjectPath);

  static inline bool classof(const Binary *v) {
    return v->isSymbolic();
  }
};

inline BasicSymbolRef::BasicSymbolRef(DataRefImpl SymbolP,
                                      const SymbolicFile *Owner)
    : SymbolPimpl(SymbolP), OwningObject(Owner) {}

inline bool BasicSymbolRef::operator==(const BasicSymbolRef &Other) const {
  return SymbolPimpl == Other.SymbolPimpl;
}

inline bool BasicSymbolRef::operator<(const BasicSymbolRef &Other) const {
  return SymbolPimpl < Other.SymbolPimpl;
}

inline void BasicSymbolRef::moveNext() {
  return OwningObject->moveSymbolNext(SymbolPimpl);
}

inline std::error_code BasicSymbolRef::printName(raw_ostream &OS) const {
  return OwningObject->printSymbolName(OS, SymbolPimpl);
}

inline uint32_t BasicSymbolRef::getFlags() const {
  return OwningObject->getSymbolFlags(SymbolPimpl);
}

inline DataRefImpl BasicSymbolRef::getRawDataRefImpl() const {
  return SymbolPimpl;
}

inline const SymbolicFile *BasicSymbolRef::getObject() const {
  return OwningObject;
}

}
}

#endif