summaryrefslogtreecommitdiff
path: root/gold/gold.h
blob: f27542df15de41fdd68694dceff4b3947f494cc1 (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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
// gold.h -- general definitions for gold   -*- C++ -*-

// Copyright (C) 2006-2021 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_GOLD_H
#define GOLD_GOLD_H

#include "config.h"
#include "ansidecl.h"

#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <stdint.h>
#include <sys/types.h>

#include "system.h"

namespace gold
{

// General declarations.

class General_options;
class Command_line;
class Dirsearch;
class Input_objects;
class Mapfile;
class Symbol;
class Symbol_table;
class Layout;
class Task;
class Workqueue;
class Output_file;
template<int size, bool big_endian>
struct Relocate_info;

// Exit status codes.

enum Exit_status
{
  GOLD_OK = EXIT_SUCCESS,
  GOLD_ERR = EXIT_FAILURE,
  GOLD_FALLBACK = EXIT_FAILURE + 1
};

// Some basic types.  For these we use lower case initial letters.

// For an offset in an input or output file, use off_t.  Note that
// this will often be a 64-bit type even for a 32-bit build.

// The size of a section if we are going to look at the contents.
typedef size_t section_size_type;

// An offset within a section when we are looking at the contents.
typedef ptrdiff_t section_offset_type;

// The name of the program as used in error messages.
extern const char* program_name;

// This function is called to exit the program.  Status is true to
// exit success (0) and false to exit failure (1).
extern void
gold_exit(Exit_status status) ATTRIBUTE_NORETURN;

// This function is called to emit an error message and then
// immediately exit with failure.
extern void
gold_fatal(const char* format, ...) ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF_1;

// This function is called to issue an error.  This will cause gold to
// eventually exit with failure.
extern void
gold_error(const char* msg, ...) ATTRIBUTE_PRINTF_1;

// This function is called to issue a warning.
extern void
gold_warning(const char* msg, ...) ATTRIBUTE_PRINTF_1;

// This function is called to print an informational message.
extern void
gold_info(const char* msg, ...) ATTRIBUTE_PRINTF_1;

// This function is called to print a trace message.
extern void
gold_trace(const char* msg, ...) ATTRIBUTE_PRINTF_1;

// This function is called to emit an error message and then
// immediately exit with fallback status (e.g., when
// --incremental-update fails and the link needs to be restarted
// with --incremental-full).
extern void
gold_fallback(const char* format, ...) ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF_1;

// Work around a bug in gcc 4.3.0.  http://gcc.gnu.org/PR35546 .  This
// can probably be removed after the bug has been fixed for a while.
#ifdef HAVE_TEMPLATE_ATTRIBUTES
#define TEMPLATE_ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF_4
#else
#define TEMPLATE_ATTRIBUTE_PRINTF_4
#endif

// This function is called to issue an error at the location of a
// reloc.
template<int size, bool big_endian>
extern void
gold_error_at_location(const Relocate_info<size, big_endian>*,
		       size_t, off_t, const char* format, ...)
  TEMPLATE_ATTRIBUTE_PRINTF_4;

// This function is called to issue a warning at the location of a
// reloc.
template<int size, bool big_endian>
extern void
gold_warning_at_location(const Relocate_info<size, big_endian>*,
			 size_t, off_t, const char* format, ...)
  TEMPLATE_ATTRIBUTE_PRINTF_4;

// This function is called to report an undefined symbol without
// a relocation (e.g., referenced by a dynamic object).  SYM is
// the undefined symbol.  The file name associated with the SYM
// is used to print a location for the undefined symbol.
extern void
gold_undefined_symbol(const Symbol*);

// This function is called to report an undefined symbol resulting
// from a relocation.  SYM is the undefined symbol.  RELINFO is the
// general relocation info.  RELNUM is the number of the reloc,
// and RELOFFSET is the reloc's offset.
template<int size, bool big_endian>
extern void
gold_undefined_symbol_at_location(const Symbol*,
		                  const Relocate_info<size, big_endian>*,
		                  size_t, off_t);

// This is function is called in some cases if we run out of memory.
extern void
gold_nomem() ATTRIBUTE_NORETURN;

// In versions of gcc before 4.3, using __FUNCTION__ in a template
// function can cause gcc to get confused about whether or not the
// function can return.  See http://gcc.gnu.org/PR30988.  Use a macro
// to avoid the problem.  This can be removed when we no longer need
// to care about gcc versions before 4.3.
#if defined(__GNUC__) && GCC_VERSION < 4003
#define FUNCTION_NAME static_cast<const char*>(__FUNCTION__)
#else 
#define FUNCTION_NAME __FUNCTION__
#endif

// This macro and function are used in cases which can not arise if
// the code is written correctly.

#define gold_unreachable() \
  (gold::do_gold_unreachable(__FILE__, __LINE__, FUNCTION_NAME))

extern void do_gold_unreachable(const char*, int, const char*)
  ATTRIBUTE_NORETURN;

// Assertion check.

#define gold_assert(expr) ((void)(!(expr) ? gold_unreachable(), 0 : 0))

// Print version information.
extern void
print_version(bool print_short);

// Get the version string.
extern const char*
get_version_string();

// Convert numeric types without unnoticed loss of precision.
template<typename To, typename From>
inline To
convert_types(const From from)
{
  To to = from;
  gold_assert(static_cast<From>(to) == from);
  return to;
}

// A common case of convert_types<>: convert to section_size_type.
template<typename From>
inline section_size_type
convert_to_section_size_type(const From from)
{ return convert_types<section_size_type, From>(from); }

// Queue up the first set of tasks.
extern void
queue_initial_tasks(const General_options&,
		    Dirsearch&,
		    const Command_line&,
		    Workqueue*,
		    Input_objects*,
		    Symbol_table*,
		    Layout*,
		    Mapfile*);

// Queue up the set of tasks to be done before
// the middle set of tasks.  Only used when garbage
// collection is to be done.
extern void
queue_middle_gc_tasks(const General_options&,
                      const Task*,
                      const Input_objects*,
                      Symbol_table*,
                      Layout*,
                      Workqueue*,
                      Mapfile*);

// Queue up the middle set of tasks.
extern void
queue_middle_tasks(const General_options&,
		   const Task*,
		   const Input_objects*,
		   Symbol_table*,
		   Layout*,
		   Workqueue*,
		   Mapfile*);

// Queue up the final set of tasks.
extern void
queue_final_tasks(const General_options&,
		  const Input_objects*,
		  const Symbol_table*,
		  Layout*,
		  Workqueue*,
		  Output_file* of);

inline bool
is_prefix_of(const char* prefix, const char* str)
{
  return strncmp(prefix, str, strlen(prefix)) == 0;
}

const char* const cident_section_start_prefix = "__start_";
const char* const cident_section_stop_prefix = "__stop_";

// Returns true if the name is a valid C identifier
inline bool
is_cident(const char* name)
{
  return (name[strspn(name,
		      ("0123456789"
		       "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
		       "abcdefghijklmnopqrstuvwxyz"
		       "_"))]
	  == '\0');
}

// We sometimes need to hash strings.  Ideally we should use std::tr1::hash or
// __gnu_cxx::hash on some systems but there is no guarantee that either
// one is available.  For portability, we define simple string hash functions.

template<typename Char_type>
inline size_t
string_hash(const Char_type* s, size_t length)
{
  // This is the hash function used by the dynamic linker for
  // DT_GNU_HASH entries.  I compared this to a Fowler/Noll/Vo hash
  // for a C++ program with 385,775 global symbols.  This hash
  // function was very slightly worse.  However, it is much faster to
  // compute.  Overall wall clock time was a win.
  const unsigned char* p = reinterpret_cast<const unsigned char*>(s);
  size_t h = 5381;
  for (size_t i = 0; i < length * sizeof(Char_type); ++i)
    h = h * 33 + *p++;
  return h;
}

// Same as above except we expect the string to be zero terminated.

template<typename Char_type>
inline size_t
string_hash(const Char_type* s)
{
  const unsigned char* p = reinterpret_cast<const unsigned char*>(s);
  size_t h = 5381;
  for (size_t i = 0; s[i] != 0; ++i)
    {
      for (size_t j = 0; j < sizeof(Char_type); j++)
	h = h * 33 + *p++;
    }

  return h;
}

// Return whether STRING contains a wildcard character.  This is used
// to speed up matching.

inline bool
is_wildcard_string(const char* s)
{
  return strpbrk(s, "?*[") != NULL;
}

} // End namespace gold.

#endif // !defined(GOLD_GOLD_H)