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
|
// archive.h -- archive support for gold -*- C++ -*-
#ifndef GOLD_ARCHIVE_H
#define GOLD_ARCHIVE_H
#include <string>
#include <vector>
#include "workqueue.h"
namespace gold
{
class General_options;
class Input_file;
class Input_objects;
class Input_group;
class Layout;
class Symbol_table;
// This class represents an archive--generally a libNAME.a file.
// Archives have a symbol table and a list of objects.
class Archive
{
public:
Archive(const std::string& name, Input_file* input_file)
: name_(name), input_file_(input_file), armap_(), extended_names_()
{ }
// The length of the magic string at the start of an archive.
static const int sarmag = 8;
// The magic string at the start of an archive.
static const char armag[sarmag];
// The string expected at the end of an archive member header.
static const char arfmag[2];
// The name of the object.
const std::string&
name() const
{ return this->name_; }
// Set up the archive: read the symbol map.
void
setup();
// Get a reference to the underlying file.
File_read&
file()
{ return this->input_file_->file(); }
// Lock the underlying file.
void
lock()
{ this->input_file_->file().lock(); }
// Unlock the underlying file.
void
unlock()
{ this->input_file_->file().unlock(); }
// Return whether the underlying file is locked.
bool
is_locked() const
{ return this->input_file_->file().is_locked(); }
// Select members from the archive as needed and add them to the
// link.
void
add_symbols(const General_options&, Symbol_table*, Layout*, Input_objects*);
private:
Archive(const Archive&);
Archive& operator=(const Archive&);
struct Archive_header;
// Get a view into the underlying file.
const unsigned char*
get_view(off_t start, off_t size, off_t* pbytes = NULL)
{ return this->input_file_->file().get_view(start, size, pbytes); }
// Read the archive symbol map.
void
read_armap(off_t start, off_t size);
// Read an archive member header at OFF. Return the size of the
// member, and set *PNAME to the name.
off_t
read_header(off_t off, std::string* pname);
// Interpret an archive header HDR at OFF. Return the size of the
// member, and set *PNAME to the name.
off_t
interpret_header(const Archive_header* hdr, off_t off, std::string* pname);
// Include all the archive members in the link.
void
include_all_members(const General_options&, Symbol_table*, Layout*,
Input_objects*);
// Include an archive member in the link.
void
include_member(const General_options&, Symbol_table*, Layout*,
Input_objects*, off_t off);
// An entry in the archive map of symbols to object files.
struct Armap_entry
{
// The symbol name.
const char* name;
// The offset to the file.
off_t offset;
};
// A simple hash code for off_t values.
class Seen_hash
{
public:
size_t operator()(off_t val) const
{ return static_cast<size_t>(val); }
};
// Name of object as printed to user.
std::string name_;
// For reading the file.
Input_file* input_file_;
// The archive map.
std::vector<Armap_entry> armap_;
// The extended name table.
std::string extended_names_;
// Track which symbols in the archive map are for elements which are
// defined or which have already been included in the link.
std::vector<bool> armap_checked_;
// Track which elements have been included by offset.
Unordered_set<off_t, Seen_hash> seen_offsets_;
};
// This class is used to read an archive and pick out the desired
// elements and add them to the link.
class Add_archive_symbols : public Task
{
public:
Add_archive_symbols(const General_options& options, Symbol_table* symtab,
Layout* layout, Input_objects* input_objects,
Archive* archive, Input_group* input_group,
Task_token* this_blocker,
Task_token* next_blocker)
: options_(options), symtab_(symtab), layout_(layout),
input_objects_(input_objects), archive_(archive),
input_group_(input_group), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Add_archive_symbols();
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
class Add_archive_symbols_locker;
const General_options& options_;
Symbol_table* symtab_;
Layout* layout_;
Input_objects* input_objects_;
Archive* archive_;
Input_group* input_group_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
} // End namespace gold.
#endif // !defined(GOLD_ARCHIVE_H)
|
