aboutsummaryrefslogtreecommitdiff
path: root/gold/readsyms.h
blob: ae0d009487805e16f3d6f9a662c01b75a1bc7518 (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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
// readsyms.h -- read input file symbols for gold   -*- C++ -*-

// Copyright 2006, 2007 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.

#ifndef GOLD_READSYMS_H
#define GOLD_READSYMS_H

#include <vector>

#include "workqueue.h"
#include "object.h"

namespace gold
{

class Input_objects;
class Symbol_table;
class Input_group;
class Archive;

// This Task is responsible for reading the symbols from an input
// file.  This also includes reading the relocations so that we can
// check for any that require a PLT and/or a GOT.  After the data has
// been read, this queues up another task to actually add the symbols
// to the symbol table.  The tasks are separated because the file
// reading can occur in parallel but adding the symbols must be done
// in the order of the input files.

class Read_symbols : public Task
{
 public:
  // DIRPATH is the list of directories to search for libraries.
  // INPUT is the file to read.  INPUT_GROUP is not NULL if we are in
  // the middle of an input group.  THIS_BLOCKER is used to prevent
  // the associated Add_symbols task from running before the previous
  // one has completed; it will be NULL for the first task.
  // NEXT_BLOCKER is used to block the next input file from adding
  // symbols.
  Read_symbols(const General_options& options, Input_objects* input_objects,
	       Symbol_table* symtab, Layout* layout, const Dirsearch& dirpath,
	       const Input_argument* input_argument, Input_group* input_group,
	       Task_token* this_blocker, Task_token* next_blocker)
    : options_(options), input_objects_(input_objects), symtab_(symtab),
      layout_(layout), dirpath_(dirpath), input_argument_(input_argument),
      input_group_(input_group), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  { }

  ~Read_symbols();

  // The standard Task methods.

  Is_runnable_type
  is_runnable(Workqueue*);

  Task_locker*
  locks(Workqueue*);

  void
  run(Workqueue*);

 private:
  // Handle an archive group.
  void
  do_group(Workqueue*);

  const General_options& options_;
  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  const Dirsearch& dirpath_;
  const Input_argument* input_argument_;
  Input_group* input_group_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This Task handles adding the symbols to the symbol table.  These
// tasks must be run in the same order as the arguments appear on the
// command line.

class Add_symbols : public Task
{
 public:
  // THIS_BLOCKER is used to prevent this task from running before the
  // one for the previous input file.  NEXT_BLOCKER is used to prevent
  // the next task from running.
  Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
	      Layout* layout, Object* object,
	      Read_symbols_data* sd, Task_token* this_blocker,
	      Task_token* next_blocker)
    : input_objects_(input_objects), symtab_(symtab), layout_(layout),
      object_(object), sd_(sd), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  { }

  ~Add_symbols();

  // The standard Task methods.

  Is_runnable_type
  is_runnable(Workqueue*);

  Task_locker*
  locks(Workqueue*);

  void
  run(Workqueue*);

private:
  class Add_symbols_locker;

  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  Object* object_;
  Read_symbols_data* sd_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

// This class is used to track the archives in a group.

class Input_group
{
 public:
  typedef std::vector<Archive*> Archives;
  typedef Archives::const_iterator const_iterator;

  Input_group()
    : archives_()
  { }

  // Add an archive to the group.
  void
  add_archive(Archive* arch)
  { this->archives_.push_back(arch); }

  // Loop over the archives in the group.

  const_iterator
  begin() const
  { return this->archives_.begin(); }

  const_iterator
  end() const
  { return this->archives_.end(); }

 private:
  Archives archives_;
};

// This class is used to finish up handling a group.  It is just a
// closure.

class Finish_group : public Task
{
 public:
  Finish_group(Input_objects* input_objects, Symbol_table* symtab,
	       Layout* layout, Input_group* input_group,
	       int saw_undefined, Task_token* this_blocker,
	       Task_token* next_blocker)
    : input_objects_(input_objects), symtab_(symtab),
      layout_(layout), input_group_(input_group),
      saw_undefined_(saw_undefined), this_blocker_(this_blocker),
      next_blocker_(next_blocker)
  { }

  ~Finish_group();

  // The standard Task methods.

  Is_runnable_type
  is_runnable(Workqueue*);

  Task_locker*
  locks(Workqueue*);

  void
  run(Workqueue*);

 private:
  Input_objects* input_objects_;
  Symbol_table* symtab_;
  Layout* layout_;
  Input_group* input_group_;
  int saw_undefined_;
  Task_token* this_blocker_;
  Task_token* next_blocker_;
};

} // end namespace gold

#endif // !defined(GOLD_READSYMS_H)