Archive.h revision 263508 
1//===- Archive.h - ar archive file format -----------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the ar archive file format class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_OBJECT_ARCHIVE_H
15#define LLVM_OBJECT_ARCHIVE_H
16
17#include "llvm/ADT/StringRef.h"
18#include "llvm/Object/Binary.h"
19#include "llvm/Support/ErrorHandling.h"
20#include "llvm/Support/FileSystem.h"
21#include "llvm/Support/MemoryBuffer.h"
22
23namespace llvm {
24namespace object {
25struct ArchiveMemberHeader {
26  char Name[16];
27  char LastModified[12];
28  char UID[6];
29  char GID[6];
30  char AccessMode[8];
31  char Size[10]; ///< Size of data, not including header or padding.
32  char Terminator[2];
33
34  /// Get the name without looking up long names.
35  llvm::StringRef getName() const;
36
37  /// Members are not larger than 4GB.
38  uint32_t getSize() const;
39
40  sys::fs::perms getAccessMode() const;
41  sys::TimeValue getLastModified() const;
42  unsigned getUID() const;
43  unsigned getGID() const;
44};
45
46class Archive : public Binary {
47  virtual void anchor();
48public:
49  class Child {
50    const Archive *Parent;
51    /// \brief Includes header but not padding byte.
52    StringRef Data;
53    /// \brief Offset from Data to the start of the file.
54    uint16_t StartOfFile;
55
56    const ArchiveMemberHeader *getHeader() const {
57      return reinterpret_cast<const ArchiveMemberHeader *>(Data.data());
58    }
59
60  public:
61    Child(const Archive *Parent, const char *Start);
62
63    bool operator ==(const Child &other) const {
64      assert(Parent == other.Parent);
65      return Data.begin() == other.Data.begin();
66    }
67
68    bool operator <(const Child &other) const {
69      return Data.begin() < other.Data.begin();
70    }
71
72    Child getNext() const;
73
74    error_code getName(StringRef &Result) const;
75    StringRef getRawName() const { return getHeader()->getName(); }
76    sys::TimeValue getLastModified() const {
77      return getHeader()->getLastModified();
78    }
79    unsigned getUID() const { return getHeader()->getUID(); }
80    unsigned getGID() const { return getHeader()->getGID(); }
81    sys::fs::perms getAccessMode() const {
82      return getHeader()->getAccessMode();
83    }
84    /// \return the size of the archive member without the header or padding.
85    uint64_t getSize() const { return Data.size() - StartOfFile; }
86
87    StringRef getBuffer() const {
88      return StringRef(Data.data() + StartOfFile, getSize());
89    }
90
91    error_code getMemoryBuffer(OwningPtr<MemoryBuffer> &Result,
92                               bool FullPath = false) const;
93
94    error_code getAsBinary(OwningPtr<Binary> &Result) const;
95  };
96
97  class child_iterator {
98    Child child;
99  public:
100    child_iterator() : child(Child(0, 0)) {}
101    child_iterator(const Child &c) : child(c) {}
102    const Child* operator->() const {
103      return &child;
104    }
105
106    bool operator==(const child_iterator &other) const {
107      return child == other.child;
108    }
109
110    bool operator!=(const child_iterator &other) const {
111      return !(*this == other);
112    }
113
114    bool operator <(const child_iterator &other) const {
115      return child < other.child;
116    }
117
118    child_iterator& operator++() {  // Preincrement
119      child = child.getNext();
120      return *this;
121    }
122  };
123
124  class Symbol {
125    const Archive *Parent;
126    uint32_t SymbolIndex;
127    uint32_t StringIndex; // Extra index to the string.
128
129  public:
130    bool operator ==(const Symbol &other) const {
131      return (Parent == other.Parent) && (SymbolIndex == other.SymbolIndex);
132    }
133
134    Symbol(const Archive *p, uint32_t symi, uint32_t stri)
135      : Parent(p)
136      , SymbolIndex(symi)
137      , StringIndex(stri) {}
138    error_code getName(StringRef &Result) const;
139    error_code getMember(child_iterator &Result) const;
140    Symbol getNext() const;
141  };
142
143  class symbol_iterator {
144    Symbol symbol;
145  public:
146    symbol_iterator(const Symbol &s) : symbol(s) {}
147    const Symbol *operator->() const {
148      return &symbol;
149    }
150
151    bool operator==(const symbol_iterator &other) const {
152      return symbol == other.symbol;
153    }
154
155    bool operator!=(const symbol_iterator &other) const {
156      return !(*this == other);
157    }
158
159    symbol_iterator& operator++() {  // Preincrement
160      symbol = symbol.getNext();
161      return *this;
162    }
163  };
164
165  Archive(MemoryBuffer *source, error_code &ec);
166
167  enum Kind {
168    K_GNU,
169    K_BSD,
170    K_COFF
171  };
172
173  Kind kind() const {
174    return Format;
175  }
176
177  child_iterator begin_children(bool SkipInternal = true) const;
178  child_iterator end_children() const;
179
180  symbol_iterator begin_symbols() const;
181  symbol_iterator end_symbols() const;
182
183  // Cast methods.
184  static inline bool classof(Binary const *v) {
185    return v->isArchive();
186  }
187
188  // check if a symbol is in the archive
189  child_iterator findSym(StringRef name) const;
190
191  bool hasSymbolTable() const;
192
193private:
194  child_iterator SymbolTable;
195  child_iterator StringTable;
196  child_iterator FirstRegular;
197  Kind Format;
198};
199
200}
201}
202
203#endif
204