1 // archive.h -- archive support for gold -*- C++ -*-
3 // Copyright 2006, 2007 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
23 #ifndef GOLD_ARCHIVE_H
24 #define GOLD_ARCHIVE_H
29 #include "workqueue.h"
41 // This class represents an archive--generally a libNAME.a file.
42 // Archives have a symbol table and a list of objects.
47 Archive(const std::string
& name
, Input_file
* input_file
)
48 : name_(name
), input_file_(input_file
), armap_(), armap_names_(),
49 extended_names_(), armap_checked_(), seen_offsets_()
52 // The length of the magic string at the start of an archive.
53 static const int sarmag
= 8;
55 // The magic string at the start of an archive.
56 static const char armag
[sarmag
];
58 // The string expected at the end of an archive member header.
59 static const char arfmag
[2];
61 // The name of the object.
64 { return this->name_
; }
66 // Set up the archive: read the symbol map.
70 // Get a reference to the underlying file.
73 { return this->input_file_
->file(); }
75 // Lock the underlying file.
78 { this->input_file_
->file().lock(t
); }
80 // Unlock the underlying file.
83 { this->input_file_
->file().unlock(t
); }
85 // Return whether the underlying file is locked.
88 { return this->input_file_
->file().is_locked(); }
90 // Return the token, so that the task can be queued.
93 { return this->input_file_
->file().token(); }
95 // Release the underlying file.
98 { this->input_file_
->file().release(); }
100 // Select members from the archive as needed and add them to the
103 add_symbols(Symbol_table
*, Layout
*, Input_objects
*);
106 Archive(const Archive
&);
107 Archive
& operator=(const Archive
&);
109 struct Archive_header
;
111 // Get a view into the underlying file.
113 get_view(off_t start
, section_size_type size
, bool cache
)
114 { return this->input_file_
->file().get_view(start
, size
, cache
); }
116 // Read the archive symbol map.
118 read_armap(off_t start
, section_size_type size
);
120 // Read an archive member header at OFF. CACHE is whether to cache
121 // the file view. Return the size of the member, and set *PNAME to
124 read_header(off_t off
, bool cache
, std::string
* pname
);
126 // Interpret an archive header HDR at OFF. Return the size of the
127 // member, and set *PNAME to the name.
129 interpret_header(const Archive_header
* hdr
, off_t off
, std::string
* pname
);
131 // Include all the archive members in the link.
133 include_all_members(Symbol_table
*, Layout
*, Input_objects
*);
135 // Include an archive member in the link.
137 include_member(Symbol_table
*, Layout
*, Input_objects
*, off_t off
);
139 // An entry in the archive map of symbols to object files.
142 // The offset to the symbol name in armap_names_.
144 // The file offset to the object in the archive.
148 // A simple hash code for off_t values.
152 size_t operator()(off_t val
) const
153 { return static_cast<size_t>(val
); }
156 // Name of object as printed to user.
158 // For reading the file.
159 Input_file
* input_file_
;
161 std::vector
<Armap_entry
> armap_
;
162 // The names in the archive map.
163 std::string armap_names_
;
164 // The extended name table.
165 std::string extended_names_
;
166 // Track which symbols in the archive map are for elements which are
167 // defined or which have already been included in the link.
168 std::vector
<bool> armap_checked_
;
169 // Track which elements have been included by offset.
170 Unordered_set
<off_t
, Seen_hash
> seen_offsets_
;
173 // This class is used to read an archive and pick out the desired
174 // elements and add them to the link.
176 class Add_archive_symbols
: public Task
179 Add_archive_symbols(Symbol_table
* symtab
, Layout
* layout
,
180 Input_objects
* input_objects
,
181 Archive
* archive
, Input_group
* input_group
,
182 Task_token
* this_blocker
,
183 Task_token
* next_blocker
)
184 : symtab_(symtab
), layout_(layout
), input_objects_(input_objects
),
185 archive_(archive
), input_group_(input_group
),
186 this_blocker_(this_blocker
), next_blocker_(next_blocker
)
189 ~Add_archive_symbols();
191 // The standard Task methods.
205 if (this->archive_
== NULL
)
206 return "Add_archive_symbols";
207 return "Add_archive_symbols " + this->archive_
->file().filename();
211 Symbol_table
* symtab_
;
213 Input_objects
* input_objects_
;
215 Input_group
* input_group_
;
216 Task_token
* this_blocker_
;
217 Task_token
* next_blocker_
;
220 } // End namespace gold.
222 #endif // !defined(GOLD_ARCHIVE_H)
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