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a2fb1b05 ILT |
1 | // layout.h -- lay out output file sections for gold -*- C++ -*- |
2 | ||
2e702c99 RM |
3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
4 | // Free Software Foundation, Inc. | |
6cb15b7f ILT |
5 | // Written by Ian Lance Taylor <iant@google.com>. |
6 | ||
7 | // This file is part of gold. | |
8 | ||
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; either version 3 of the License, or | |
12 | // (at your option) any later version. | |
13 | ||
14 | // This program is distributed in the hope that it will be useful, | |
15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License | |
20 | // along with this program; if not, write to the Free Software | |
21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | // MA 02110-1301, USA. | |
23 | ||
a2fb1b05 ILT |
24 | #ifndef GOLD_LAYOUT_H |
25 | #define GOLD_LAYOUT_H | |
26 | ||
e94cf127 | 27 | #include <cstring> |
a2fb1b05 | 28 | #include <list> |
1ef4d87f | 29 | #include <map> |
a2fb1b05 ILT |
30 | #include <string> |
31 | #include <utility> | |
32 | #include <vector> | |
33 | ||
e5756efb | 34 | #include "script.h" |
a2fb1b05 ILT |
35 | #include "workqueue.h" |
36 | #include "object.h" | |
14b31740 | 37 | #include "dynobj.h" |
a2fb1b05 ILT |
38 | #include "stringpool.h" |
39 | ||
40 | namespace gold | |
41 | { | |
42 | ||
ead1e424 | 43 | class General_options; |
3ce2c28e | 44 | class Incremental_inputs; |
cdc29364 | 45 | class Incremental_binary; |
54dc6425 | 46 | class Input_objects; |
7d9e3d98 | 47 | class Mapfile; |
75f65a3e | 48 | class Symbol_table; |
ead1e424 | 49 | class Output_section_data; |
a2fb1b05 | 50 | class Output_section; |
75f65a3e | 51 | class Output_section_headers; |
20e6d0d6 DK |
52 | class Output_segment_headers; |
53 | class Output_file_header; | |
a2fb1b05 | 54 | class Output_segment; |
54dc6425 | 55 | class Output_data; |
3a44184e | 56 | class Output_data_reloc_generic; |
a3ad94ed | 57 | class Output_data_dynamic; |
d491d34e | 58 | class Output_symtab_xindex; |
62b01cb5 ILT |
59 | class Output_reduced_debug_abbrev_section; |
60 | class Output_reduced_debug_info_section; | |
730cdc88 | 61 | class Eh_frame; |
c1027032 | 62 | class Gdb_index; |
61ba1cf9 | 63 | class Target; |
09ec0418 | 64 | struct Timespec; |
a2fb1b05 | 65 | |
a2e47362 CC |
66 | // Return TRUE if SECNAME is the name of a compressed debug section. |
67 | extern bool | |
68 | is_compressed_debug_section(const char* secname); | |
69 | ||
cdc29364 CC |
70 | // Maintain a list of free space within a section, segment, or file. |
71 | // Used for incremental update links. | |
72 | ||
73 | class Free_list | |
74 | { | |
75 | public: | |
8ea8cd50 CC |
76 | struct Free_list_node |
77 | { | |
78 | Free_list_node(off_t start, off_t end) | |
79 | : start_(start), end_(end) | |
80 | { } | |
81 | off_t start_; | |
82 | off_t end_; | |
83 | }; | |
84 | typedef std::list<Free_list_node>::const_iterator Const_iterator; | |
85 | ||
cdc29364 | 86 | Free_list() |
8ea8cd50 CC |
87 | : list_(), last_remove_(list_.begin()), extend_(false), length_(0), |
88 | min_hole_(0) | |
cdc29364 CC |
89 | { } |
90 | ||
8ea8cd50 CC |
91 | // Initialize the free list for a section of length LEN. |
92 | // If EXTEND is true, free space may be allocated past the end. | |
cdc29364 CC |
93 | void |
94 | init(off_t len, bool extend); | |
95 | ||
8ea8cd50 CC |
96 | // Set the minimum hole size that is allowed when allocating |
97 | // from the free list. | |
98 | void | |
99 | set_min_hole_size(off_t min_hole) | |
100 | { this->min_hole_ = min_hole; } | |
101 | ||
102 | // Remove a chunk from the free list. | |
cdc29364 CC |
103 | void |
104 | remove(off_t start, off_t end); | |
105 | ||
8ea8cd50 CC |
106 | // Allocate a chunk of space from the free list of length LEN, |
107 | // with alignment ALIGN, and minimum offset MINOFF. | |
cdc29364 CC |
108 | off_t |
109 | allocate(off_t len, uint64_t align, off_t minoff); | |
110 | ||
8ea8cd50 CC |
111 | // Return an iterator for the beginning of the free list. |
112 | Const_iterator | |
113 | begin() const | |
114 | { return this->list_.begin(); } | |
115 | ||
116 | // Return an iterator for the end of the free list. | |
117 | Const_iterator | |
118 | end() const | |
119 | { return this->list_.end(); } | |
120 | ||
121 | // Dump the free list (for debugging). | |
cdc29364 CC |
122 | void |
123 | dump(); | |
124 | ||
8ea8cd50 | 125 | // Print usage statistics. |
cdc29364 CC |
126 | static void |
127 | print_stats(); | |
128 | ||
129 | private: | |
cdc29364 CC |
130 | typedef std::list<Free_list_node>::iterator Iterator; |
131 | ||
132 | // The free list. | |
133 | std::list<Free_list_node> list_; | |
134 | ||
135 | // The last node visited during a remove operation. | |
136 | Iterator last_remove_; | |
137 | ||
138 | // Whether we can extend past the original length. | |
139 | bool extend_; | |
140 | ||
141 | // The total length of the section, segment, or file. | |
142 | off_t length_; | |
143 | ||
8ea8cd50 CC |
144 | // The minimum hole size allowed. When allocating from the free list, |
145 | // we must not leave a hole smaller than this. | |
146 | off_t min_hole_; | |
147 | ||
cdc29364 CC |
148 | // Statistics: |
149 | // The total number of free lists used. | |
150 | static unsigned int num_lists; | |
151 | // The total number of free list nodes used. | |
152 | static unsigned int num_nodes; | |
153 | // The total number of calls to Free_list::remove. | |
154 | static unsigned int num_removes; | |
155 | // The total number of nodes visited during calls to Free_list::remove. | |
156 | static unsigned int num_remove_visits; | |
157 | // The total number of calls to Free_list::allocate. | |
158 | static unsigned int num_allocates; | |
159 | // The total number of nodes visited during calls to Free_list::allocate. | |
160 | static unsigned int num_allocate_visits; | |
161 | }; | |
162 | ||
92e059d8 ILT |
163 | // This task function handles mapping the input sections to output |
164 | // sections and laying them out in memory. | |
a2fb1b05 | 165 | |
92e059d8 | 166 | class Layout_task_runner : public Task_function_runner |
a2fb1b05 ILT |
167 | { |
168 | public: | |
169 | // OPTIONS is the command line options, INPUT_OBJECTS is the list of | |
92e059d8 ILT |
170 | // input objects, SYMTAB is the symbol table, LAYOUT is the layout |
171 | // object. | |
172 | Layout_task_runner(const General_options& options, | |
173 | const Input_objects* input_objects, | |
174 | Symbol_table* symtab, | |
2e702c99 | 175 | Target* target, |
7d9e3d98 ILT |
176 | Layout* layout, |
177 | Mapfile* mapfile) | |
75f65a3e | 178 | : options_(options), input_objects_(input_objects), symtab_(symtab), |
7d9e3d98 | 179 | target_(target), layout_(layout), mapfile_(mapfile) |
a2fb1b05 ILT |
180 | { } |
181 | ||
92e059d8 | 182 | // Run the operation. |
a2fb1b05 | 183 | void |
17a1d0a9 | 184 | run(Workqueue*, const Task*); |
a2fb1b05 ILT |
185 | |
186 | private: | |
92e059d8 ILT |
187 | Layout_task_runner(const Layout_task_runner&); |
188 | Layout_task_runner& operator=(const Layout_task_runner&); | |
a2fb1b05 ILT |
189 | |
190 | const General_options& options_; | |
54dc6425 | 191 | const Input_objects* input_objects_; |
75f65a3e | 192 | Symbol_table* symtab_; |
8851ecca | 193 | Target* target_; |
12e14209 | 194 | Layout* layout_; |
7d9e3d98 | 195 | Mapfile* mapfile_; |
a2fb1b05 ILT |
196 | }; |
197 | ||
1ef4d87f ILT |
198 | // This class holds information about the comdat group or |
199 | // .gnu.linkonce section that will be kept for a given signature. | |
8a4c0b0d | 200 | |
1ef4d87f | 201 | class Kept_section |
8a4c0b0d | 202 | { |
1ef4d87f ILT |
203 | private: |
204 | // For a comdat group, we build a mapping from the name of each | |
205 | // section in the group to the section index and the size in object. | |
206 | // When we discard a group in some other object file, we use this | |
207 | // map to figure out which kept section the discarded section is | |
208 | // associated with. We then use that mapping when processing relocs | |
209 | // against discarded sections. | |
210 | struct Comdat_section_info | |
211 | { | |
212 | // The section index. | |
213 | unsigned int shndx; | |
214 | // The section size. | |
215 | uint64_t size; | |
216 | ||
217 | Comdat_section_info(unsigned int a_shndx, uint64_t a_size) | |
218 | : shndx(a_shndx), size(a_size) | |
219 | { } | |
220 | }; | |
221 | ||
222 | // Most comdat groups have only one or two sections, so we use a | |
223 | // std::map rather than an Unordered_map to optimize for that case | |
224 | // without paying too heavily for groups with more sections. | |
225 | typedef std::map<std::string, Comdat_section_info> Comdat_group; | |
226 | ||
227 | public: | |
8a4c0b0d | 228 | Kept_section() |
1ef4d87f ILT |
229 | : object_(NULL), shndx_(0), is_comdat_(false), is_group_name_(false) |
230 | { this->u_.linkonce_size = 0; } | |
231 | ||
232 | // We need to support copies for the signature map in the Layout | |
233 | // object, but we should never copy an object after it has been | |
234 | // marked as a comdat section. | |
235 | Kept_section(const Kept_section& k) | |
236 | : object_(k.object_), shndx_(k.shndx_), is_comdat_(false), | |
237 | is_group_name_(k.is_group_name_) | |
238 | { | |
239 | gold_assert(!k.is_comdat_); | |
240 | this->u_.linkonce_size = 0; | |
241 | } | |
242 | ||
243 | ~Kept_section() | |
244 | { | |
245 | if (this->is_comdat_) | |
246 | delete this->u_.group_sections; | |
247 | } | |
248 | ||
249 | // The object where this section lives. | |
250 | Relobj* | |
251 | object() const | |
252 | { return this->object_; } | |
8a4c0b0d | 253 | |
1ef4d87f ILT |
254 | // Set the object. |
255 | void | |
2ea97941 | 256 | set_object(Relobj* object) |
1ef4d87f ILT |
257 | { |
258 | gold_assert(this->object_ == NULL); | |
2ea97941 | 259 | this->object_ = object; |
1ef4d87f ILT |
260 | } |
261 | ||
262 | // The section index. | |
263 | unsigned int | |
264 | shndx() const | |
265 | { return this->shndx_; } | |
266 | ||
267 | // Set the section index. | |
268 | void | |
2ea97941 | 269 | set_shndx(unsigned int shndx) |
1ef4d87f ILT |
270 | { |
271 | gold_assert(this->shndx_ == 0); | |
2ea97941 | 272 | this->shndx_ = shndx; |
1ef4d87f ILT |
273 | } |
274 | ||
275 | // Whether this is a comdat group. | |
276 | bool | |
277 | is_comdat() const | |
278 | { return this->is_comdat_; } | |
279 | ||
280 | // Set that this is a comdat group. | |
281 | void | |
282 | set_is_comdat() | |
283 | { | |
284 | gold_assert(!this->is_comdat_); | |
285 | this->is_comdat_ = true; | |
286 | this->u_.group_sections = new Comdat_group(); | |
287 | } | |
8a4c0b0d | 288 | |
1ef4d87f ILT |
289 | // Whether this is associated with the name of a group or section |
290 | // rather than the symbol name derived from a linkonce section. | |
291 | bool | |
292 | is_group_name() const | |
293 | { return this->is_group_name_; } | |
294 | ||
295 | // Note that this represents a comdat group rather than a single | |
296 | // linkonce section. | |
297 | void | |
298 | set_is_group_name() | |
299 | { this->is_group_name_ = true; } | |
300 | ||
301 | // Add a section to the group list. | |
302 | void | |
2ea97941 | 303 | add_comdat_section(const std::string& name, unsigned int shndx, |
1ef4d87f ILT |
304 | uint64_t size) |
305 | { | |
306 | gold_assert(this->is_comdat_); | |
2ea97941 | 307 | Comdat_section_info sinfo(shndx, size); |
1ef4d87f ILT |
308 | this->u_.group_sections->insert(std::make_pair(name, sinfo)); |
309 | } | |
310 | ||
311 | // Look for a section name in the group list, and return whether it | |
312 | // was found. If found, returns the section index and size. | |
313 | bool | |
ca09d69a NC |
314 | find_comdat_section(const std::string& name, unsigned int* pshndx, |
315 | uint64_t* psize) const | |
1ef4d87f ILT |
316 | { |
317 | gold_assert(this->is_comdat_); | |
318 | Comdat_group::const_iterator p = this->u_.group_sections->find(name); | |
319 | if (p == this->u_.group_sections->end()) | |
320 | return false; | |
321 | *pshndx = p->second.shndx; | |
322 | *psize = p->second.size; | |
323 | return true; | |
324 | } | |
325 | ||
326 | // If there is only one section in the group list, return true, and | |
327 | // return the section index and size. | |
328 | bool | |
ca09d69a | 329 | find_single_comdat_section(unsigned int* pshndx, uint64_t* psize) const |
1ef4d87f ILT |
330 | { |
331 | gold_assert(this->is_comdat_); | |
332 | if (this->u_.group_sections->size() != 1) | |
333 | return false; | |
334 | Comdat_group::const_iterator p = this->u_.group_sections->begin(); | |
335 | *pshndx = p->second.shndx; | |
336 | *psize = p->second.size; | |
337 | return true; | |
338 | } | |
339 | ||
340 | // Return the size of a linkonce section. | |
341 | uint64_t | |
342 | linkonce_size() const | |
343 | { | |
344 | gold_assert(!this->is_comdat_); | |
345 | return this->u_.linkonce_size; | |
346 | } | |
347 | ||
348 | // Set the size of a linkonce section. | |
349 | void | |
350 | set_linkonce_size(uint64_t size) | |
351 | { | |
352 | gold_assert(!this->is_comdat_); | |
353 | this->u_.linkonce_size = size; | |
354 | } | |
355 | ||
356 | private: | |
357 | // No assignment. | |
358 | Kept_section& operator=(const Kept_section&); | |
359 | ||
360 | // The object containing the comdat group or .gnu.linkonce section. | |
361 | Relobj* object_; | |
362 | // Index of the group section for comdats and the section itself for | |
8a4c0b0d | 363 | // .gnu.linkonce. |
1ef4d87f ILT |
364 | unsigned int shndx_; |
365 | // True if this is for a comdat group rather than a .gnu.linkonce | |
366 | // section. | |
367 | bool is_comdat_; | |
8a4c0b0d ILT |
368 | // The Kept_sections are values of a mapping, that maps names to |
369 | // them. This field is true if this struct is associated with the | |
370 | // name of a comdat or .gnu.linkonce, false if it is associated with | |
371 | // the name of a symbol obtained from the .gnu.linkonce.* name | |
372 | // through some heuristics. | |
1ef4d87f ILT |
373 | bool is_group_name_; |
374 | union | |
375 | { | |
376 | // If the is_comdat_ field is true, this holds a map from names of | |
377 | // the sections in the group to section indexes in object_ and to | |
378 | // section sizes. | |
379 | Comdat_group* group_sections; | |
380 | // If the is_comdat_ field is false, this holds the size of the | |
381 | // single section. | |
382 | uint64_t linkonce_size; | |
383 | } u_; | |
8a4c0b0d ILT |
384 | }; |
385 | ||
22f0da72 ILT |
386 | // The ordering for output sections. This controls how output |
387 | // sections are ordered within a PT_LOAD output segment. | |
388 | ||
389 | enum Output_section_order | |
390 | { | |
391 | // Unspecified. Used for non-load segments. Also used for the file | |
392 | // and segment headers. | |
393 | ORDER_INVALID, | |
394 | ||
395 | // The PT_INTERP section should come first, so that the dynamic | |
396 | // linker can pick it up quickly. | |
397 | ORDER_INTERP, | |
398 | ||
399 | // Loadable read-only note sections come next so that the PT_NOTE | |
400 | // segment is on the first page of the executable. | |
401 | ORDER_RO_NOTE, | |
402 | ||
403 | // Put read-only sections used by the dynamic linker early in the | |
404 | // executable to minimize paging. | |
405 | ORDER_DYNAMIC_LINKER, | |
406 | ||
407 | // Put reloc sections used by the dynamic linker after other | |
408 | // sections used by the dynamic linker; otherwise, objcopy and strip | |
409 | // get confused. | |
410 | ORDER_DYNAMIC_RELOCS, | |
411 | ||
412 | // Put the PLT reloc section after the other dynamic relocs; | |
9a2743de | 413 | // otherwise, prelink gets confused. |
22f0da72 ILT |
414 | ORDER_DYNAMIC_PLT_RELOCS, |
415 | ||
416 | // The .init section. | |
417 | ORDER_INIT, | |
418 | ||
419 | // The PLT. | |
420 | ORDER_PLT, | |
421 | ||
422 | // The regular text sections. | |
423 | ORDER_TEXT, | |
424 | ||
425 | // The .fini section. | |
426 | ORDER_FINI, | |
427 | ||
428 | // The read-only sections. | |
429 | ORDER_READONLY, | |
430 | ||
431 | // The exception frame sections. | |
432 | ORDER_EHFRAME, | |
433 | ||
434 | // The TLS sections come first in the data section. | |
435 | ORDER_TLS_DATA, | |
436 | ORDER_TLS_BSS, | |
437 | ||
438 | // Local RELRO (read-only after relocation) sections come before | |
439 | // non-local RELRO sections. This data will be fully resolved by | |
440 | // the prelinker. | |
441 | ORDER_RELRO_LOCAL, | |
442 | ||
443 | // Non-local RELRO sections are grouped together after local RELRO | |
444 | // sections. All RELRO sections must be adjacent so that they can | |
445 | // all be put into a PT_GNU_RELRO segment. | |
446 | ORDER_RELRO, | |
447 | ||
448 | // We permit marking exactly one output section as the last RELRO | |
449 | // section. We do this so that the read-only GOT can be adjacent to | |
450 | // the writable GOT. | |
451 | ORDER_RELRO_LAST, | |
452 | ||
453 | // Similarly, we permit marking exactly one output section as the | |
454 | // first non-RELRO section. | |
455 | ORDER_NON_RELRO_FIRST, | |
456 | ||
457 | // The regular data sections come after the RELRO sections. | |
458 | ORDER_DATA, | |
459 | ||
460 | // Large data sections normally go in large data segments. | |
461 | ORDER_LARGE_DATA, | |
462 | ||
463 | // Group writable notes so that we can have a single PT_NOTE | |
464 | // segment. | |
465 | ORDER_RW_NOTE, | |
466 | ||
467 | // The small data sections must be at the end of the data sections, | |
468 | // so that they can be adjacent to the small BSS sections. | |
469 | ORDER_SMALL_DATA, | |
470 | ||
471 | // The BSS sections start here. | |
472 | ||
473 | // The small BSS sections must be at the start of the BSS sections, | |
474 | // so that they can be adjacent to the small data sections. | |
475 | ORDER_SMALL_BSS, | |
476 | ||
477 | // The regular BSS sections. | |
478 | ORDER_BSS, | |
479 | ||
480 | // The large BSS sections come after the other BSS sections. | |
481 | ORDER_LARGE_BSS, | |
482 | ||
483 | // Maximum value. | |
484 | ORDER_MAX | |
485 | }; | |
486 | ||
a2fb1b05 ILT |
487 | // This class handles the details of laying out input sections. |
488 | ||
489 | class Layout | |
490 | { | |
491 | public: | |
e55bde5e | 492 | Layout(int number_of_input_files, Script_options*); |
54dc6425 | 493 | |
20e6d0d6 DK |
494 | ~Layout() |
495 | { | |
496 | delete this->relaxation_debug_check_; | |
497 | delete this->segment_states_; | |
498 | } | |
499 | ||
cdc29364 CC |
500 | // For incremental links, record the base file to be modified. |
501 | void | |
502 | set_incremental_base(Incremental_binary* base); | |
503 | ||
504 | Incremental_binary* | |
505 | incremental_base() | |
506 | { return this->incremental_base_; } | |
507 | ||
508 | // For incremental links, record the initial fixed layout of a section | |
509 | // from the base file, and return a pointer to the Output_section. | |
510 | template<int size, bool big_endian> | |
511 | Output_section* | |
512 | init_fixed_output_section(const char*, elfcpp::Shdr<size, big_endian>&); | |
513 | ||
ead1e424 ILT |
514 | // Given an input section SHNDX, named NAME, with data in SHDR, from |
515 | // the object file OBJECT, return the output section where this | |
730cdc88 ILT |
516 | // input section should go. RELOC_SHNDX is the index of a |
517 | // relocation section which applies to this section, or 0 if none, | |
518 | // or -1U if more than one. RELOC_TYPE is the type of the | |
519 | // relocation section if there is one. Set *OFFSET to the offset | |
520 | // within the output section. | |
a2fb1b05 ILT |
521 | template<int size, bool big_endian> |
522 | Output_section* | |
6fa2a40b | 523 | layout(Sized_relobj_file<size, big_endian> *object, unsigned int shndx, |
730cdc88 ILT |
524 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
525 | unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset); | |
526 | ||
f0558624 ST |
527 | std::map<Section_id, unsigned int>* |
528 | get_section_order_map() | |
529 | { return &this->section_order_map_; } | |
2e702c99 | 530 | |
16164a6b ST |
531 | // Struct to store segment info when mapping some input sections to |
532 | // unique segments using linker plugins. Mapping an input section to | |
533 | // a unique segment is done by first placing such input sections in | |
534 | // unique output sections and then mapping the output section to a | |
535 | // unique segment. NAME is the name of the output section. FLAGS | |
536 | // and ALIGN are the extra flags and alignment of the segment. | |
537 | struct Unique_segment_info | |
538 | { | |
539 | // Identifier for the segment. ELF segments dont have names. This | |
540 | // is used as the name of the output section mapped to the segment. | |
541 | const char* name; | |
542 | // Additional segment flags. | |
543 | uint64_t flags; | |
544 | // Segment alignment. | |
545 | uint64_t align; | |
546 | }; | |
547 | ||
548 | // Mapping from input section to segment. | |
549 | typedef std::map<Const_section_id, Unique_segment_info*> | |
550 | Section_segment_map; | |
551 | ||
552 | // Maps section SECN to SEGMENT s. | |
553 | void | |
554 | insert_section_segment_map(Const_section_id secn, Unique_segment_info *s); | |
28f2a4ac ST |
555 | |
556 | // By default, gold groups input sections with certain prefixes. This | |
557 | // function returns true if this section name NAME contains such a prefix. | |
558 | bool | |
559 | is_section_name_prefix_grouped(const char *name); | |
16164a6b | 560 | |
e9552f7e ST |
561 | bool |
562 | is_section_ordering_specified() | |
563 | { return this->section_ordering_specified_; } | |
564 | ||
565 | void | |
566 | set_section_ordering_specified() | |
567 | { this->section_ordering_specified_ = true; } | |
568 | ||
16164a6b ST |
569 | bool |
570 | is_unique_segment_for_sections_specified() const | |
571 | { return this->unique_segment_for_sections_specified_; } | |
572 | ||
573 | void | |
574 | set_unique_segment_for_sections_specified() | |
575 | { this->unique_segment_for_sections_specified_ = true; } | |
576 | ||
cdc29364 CC |
577 | // For incremental updates, allocate a block of memory from the |
578 | // free list. Find a block starting at or after MINOFF. | |
579 | off_t | |
580 | allocate(off_t len, uint64_t align, off_t minoff) | |
581 | { return this->free_list_.allocate(len, align, minoff); } | |
582 | ||
6e9ba2ca ST |
583 | unsigned int |
584 | find_section_order_index(const std::string&); | |
585 | ||
e9552f7e ST |
586 | // Read the sequence of input sections from the file specified with |
587 | // linker option --section-ordering-file. | |
6e9ba2ca ST |
588 | void |
589 | read_layout_from_file(); | |
590 | ||
6a74a719 ILT |
591 | // Layout an input reloc section when doing a relocatable link. The |
592 | // section is RELOC_SHNDX in OBJECT, with data in SHDR. | |
593 | // DATA_SECTION is the reloc section to which it refers. RR is the | |
594 | // relocatable information. | |
595 | template<int size, bool big_endian> | |
596 | Output_section* | |
6fa2a40b | 597 | layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
598 | unsigned int reloc_shndx, |
599 | const elfcpp::Shdr<size, big_endian>& shdr, | |
600 | Output_section* data_section, | |
601 | Relocatable_relocs* rr); | |
602 | ||
603 | // Layout a group section when doing a relocatable link. | |
604 | template<int size, bool big_endian> | |
605 | void | |
606 | layout_group(Symbol_table* symtab, | |
6fa2a40b | 607 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
608 | unsigned int group_shndx, |
609 | const char* group_section_name, | |
610 | const char* signature, | |
611 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
612 | elfcpp::Elf_Word flags, |
613 | std::vector<unsigned int>* shndxes); | |
6a74a719 | 614 | |
730cdc88 ILT |
615 | // Like layout, only for exception frame sections. OBJECT is an |
616 | // object file. SYMBOLS is the contents of the symbol table | |
617 | // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of | |
618 | // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a | |
619 | // .eh_frame section in OBJECT. SHDR is the section header. | |
620 | // RELOC_SHNDX is the index of a relocation section which applies to | |
621 | // this section, or 0 if none, or -1U if more than one. RELOC_TYPE | |
622 | // is the type of the relocation section if there is one. This | |
623 | // returns the output section, and sets *OFFSET to the offset. | |
624 | template<int size, bool big_endian> | |
625 | Output_section* | |
6fa2a40b | 626 | layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
627 | const unsigned char* symbols, |
628 | off_t symbols_size, | |
629 | const unsigned char* symbol_names, | |
630 | off_t symbol_names_size, | |
631 | unsigned int shndx, | |
632 | const elfcpp::Shdr<size, big_endian>& shdr, | |
633 | unsigned int reloc_shndx, unsigned int reloc_type, | |
634 | off_t* offset); | |
a2fb1b05 | 635 | |
07a60597 ILT |
636 | // Add .eh_frame information for a PLT. The FDE must start with a |
637 | // 4-byte PC-relative reference to the start of the PLT, followed by | |
638 | // a 4-byte size of PLT. | |
639 | void | |
640 | add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
641 | size_t cie_length, const unsigned char* fde_data, | |
642 | size_t fde_length); | |
643 | ||
c1027032 CC |
644 | // Scan a .debug_info or .debug_types section, and add summary |
645 | // information to the .gdb_index section. | |
646 | template<int size, bool big_endian> | |
647 | void | |
648 | add_to_gdb_index(bool is_type_unit, | |
649 | Sized_relobj<size, big_endian>* object, | |
650 | const unsigned char* symbols, | |
651 | off_t symbols_size, | |
652 | unsigned int shndx, | |
653 | unsigned int reloc_shndx, | |
654 | unsigned int reloc_type); | |
655 | ||
35cdfc9a ILT |
656 | // Handle a GNU stack note. This is called once per input object |
657 | // file. SEEN_GNU_STACK is true if the object file has a | |
658 | // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags | |
659 | // from that section if there was one. | |
660 | void | |
83e17bd5 CC |
661 | layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
662 | const Object*); | |
35cdfc9a | 663 | |
ead1e424 | 664 | // Add an Output_section_data to the layout. This is used for |
22f0da72 ILT |
665 | // special sections like the GOT section. ORDER is where the |
666 | // section should wind up in the output segment. IS_RELRO is true | |
667 | // for relro sections. | |
9f1d377b | 668 | Output_section* |
ead1e424 ILT |
669 | add_output_section_data(const char* name, elfcpp::Elf_Word type, |
670 | elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
671 | Output_section_data*, Output_section_order order, |
672 | bool is_relro); | |
1a2dff53 ILT |
673 | |
674 | // Increase the size of the relro segment by this much. | |
675 | void | |
676 | increase_relro(unsigned int s) | |
677 | { this->increase_relro_ += s; } | |
ead1e424 | 678 | |
a3ad94ed ILT |
679 | // Create dynamic sections if necessary. |
680 | void | |
9b07f471 | 681 | create_initial_dynamic_sections(Symbol_table*); |
a3ad94ed | 682 | |
bfd58944 ILT |
683 | // Define __start and __stop symbols for output sections. |
684 | void | |
9b07f471 | 685 | define_section_symbols(Symbol_table*); |
bfd58944 | 686 | |
9c547ec3 ILT |
687 | // Create automatic note sections. |
688 | void | |
689 | create_notes(); | |
690 | ||
919ed24c ILT |
691 | // Create sections for linker scripts. |
692 | void | |
693 | create_script_sections() | |
694 | { this->script_options_->create_script_sections(this); } | |
695 | ||
e5756efb ILT |
696 | // Define symbols from any linker script. |
697 | void | |
9b07f471 ILT |
698 | define_script_symbols(Symbol_table* symtab) |
699 | { this->script_options_->add_symbols_to_table(symtab); } | |
e5756efb | 700 | |
755ab8af ILT |
701 | // Define symbols for group signatures. |
702 | void | |
703 | define_group_signatures(Symbol_table*); | |
704 | ||
61ba1cf9 ILT |
705 | // Return the Stringpool used for symbol names. |
706 | const Stringpool* | |
707 | sympool() const | |
708 | { return &this->sympool_; } | |
709 | ||
16649710 ILT |
710 | // Return the Stringpool used for dynamic symbol names and dynamic |
711 | // tags. | |
712 | const Stringpool* | |
713 | dynpool() const | |
714 | { return &this->dynpool_; } | |
715 | ||
7d172687 ILT |
716 | // Return the .dynamic output section. This is only valid after the |
717 | // layout has been finalized. | |
718 | Output_section* | |
719 | dynamic_section() const | |
720 | { return this->dynamic_section_; } | |
721 | ||
d491d34e ILT |
722 | // Return the symtab_xindex section used to hold large section |
723 | // indexes for the normal symbol table. | |
724 | Output_symtab_xindex* | |
725 | symtab_xindex() const | |
726 | { return this->symtab_xindex_; } | |
727 | ||
728 | // Return the dynsym_xindex section used to hold large section | |
729 | // indexes for the dynamic symbol table. | |
730 | Output_symtab_xindex* | |
731 | dynsym_xindex() const | |
732 | { return this->dynsym_xindex_; } | |
733 | ||
a2fb1b05 ILT |
734 | // Return whether a section is a .gnu.linkonce section, given the |
735 | // section name. | |
736 | static inline bool | |
737 | is_linkonce(const char* name) | |
738 | { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; } | |
739 | ||
d7bb5745 ILT |
740 | // Whether we have added an input section. |
741 | bool | |
742 | have_added_input_section() const | |
743 | { return this->have_added_input_section_; } | |
744 | ||
e94cf127 CC |
745 | // Return true if a section is a debugging section. |
746 | static inline bool | |
747 | is_debug_info_section(const char* name) | |
748 | { | |
749 | // Debugging sections can only be recognized by name. | |
750 | return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0 | |
2e702c99 RM |
751 | || strncmp(name, ".zdebug", sizeof(".zdebug") - 1) == 0 |
752 | || strncmp(name, ".gnu.linkonce.wi.", | |
753 | sizeof(".gnu.linkonce.wi.") - 1) == 0 | |
754 | || strncmp(name, ".line", sizeof(".line") - 1) == 0 | |
755 | || strncmp(name, ".stab", sizeof(".stab") - 1) == 0); | |
e94cf127 CC |
756 | } |
757 | ||
5393d741 ILT |
758 | // Return true if RELOBJ is an input file whose base name matches |
759 | // FILE_NAME. The base name must have an extension of ".o", and | |
760 | // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o". | |
761 | static bool | |
762 | match_file_name(const Relobj* relobj, const char* file_name); | |
763 | ||
487b39df ILT |
764 | // Return whether section SHNDX in RELOBJ is a .ctors/.dtors section |
765 | // with more than one word being mapped to a .init_array/.fini_array | |
766 | // section. | |
767 | bool | |
768 | is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const; | |
769 | ||
8a4c0b0d ILT |
770 | // Check if a comdat group or .gnu.linkonce section with the given |
771 | // NAME is selected for the link. If there is already a section, | |
772 | // *KEPT_SECTION is set to point to the signature and the function | |
1ef4d87f ILT |
773 | // returns false. Otherwise, OBJECT, SHNDX,IS_COMDAT, and |
774 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
775 | // *KEPT_SECTION is set to the internal copy and the function return | |
776 | // false. | |
a2fb1b05 | 777 | bool |
2e702c99 | 778 | find_or_add_kept_section(const std::string& name, Relobj* object, |
1ef4d87f ILT |
779 | unsigned int shndx, bool is_comdat, |
780 | bool is_group_name, Kept_section** kept_section); | |
a2fb1b05 | 781 | |
54dc6425 | 782 | // Finalize the layout after all the input sections have been added. |
75f65a3e | 783 | off_t |
8851ecca | 784 | finalize(const Input_objects*, Symbol_table*, Target*, const Task*); |
17a1d0a9 ILT |
785 | |
786 | // Return whether any sections require postprocessing. | |
787 | bool | |
788 | any_postprocessing_sections() const | |
789 | { return this->any_postprocessing_sections_; } | |
54dc6425 | 790 | |
e44fcf3b ILT |
791 | // Return the size of the output file. |
792 | off_t | |
793 | output_file_size() const | |
794 | { return this->output_file_size_; } | |
795 | ||
16649710 ILT |
796 | // Return the TLS segment. This will return NULL if there isn't |
797 | // one. | |
92e059d8 ILT |
798 | Output_segment* |
799 | tls_segment() const | |
800 | { return this->tls_segment_; } | |
801 | ||
16649710 ILT |
802 | // Return the normal symbol table. |
803 | Output_section* | |
804 | symtab_section() const | |
805 | { | |
806 | gold_assert(this->symtab_section_ != NULL); | |
807 | return this->symtab_section_; | |
808 | } | |
809 | ||
bec5b579 CC |
810 | // Return the file offset of the normal symbol table. |
811 | off_t | |
812 | symtab_section_offset() const; | |
813 | ||
886f533a ILT |
814 | // Return the section index of the normal symbol tabl.e |
815 | unsigned int | |
816 | symtab_section_shndx() const; | |
817 | ||
16649710 ILT |
818 | // Return the dynamic symbol table. |
819 | Output_section* | |
820 | dynsym_section() const | |
821 | { | |
822 | gold_assert(this->dynsym_section_ != NULL); | |
823 | return this->dynsym_section_; | |
824 | } | |
825 | ||
826 | // Return the dynamic tags. | |
827 | Output_data_dynamic* | |
828 | dynamic_data() const | |
829 | { return this->dynamic_data_; } | |
830 | ||
730cdc88 ILT |
831 | // Write out the output sections. |
832 | void | |
833 | write_output_sections(Output_file* of) const; | |
834 | ||
61ba1cf9 ILT |
835 | // Write out data not associated with an input file or the symbol |
836 | // table. | |
837 | void | |
9025d29d | 838 | write_data(const Symbol_table*, Output_file*) const; |
61ba1cf9 | 839 | |
730cdc88 ILT |
840 | // Write out output sections which can not be written until all the |
841 | // input sections are complete. | |
842 | void | |
27bc2bce | 843 | write_sections_after_input_sections(Output_file* of); |
730cdc88 | 844 | |
ead1e424 ILT |
845 | // Return an output section named NAME, or NULL if there is none. |
846 | Output_section* | |
847 | find_output_section(const char* name) const; | |
848 | ||
849 | // Return an output segment of type TYPE, with segment flags SET set | |
850 | // and segment flags CLEAR clear. Return NULL if there is none. | |
851 | Output_segment* | |
852 | find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
853 | elfcpp::Elf_Word clear) const; | |
854 | ||
3802b2dd ILT |
855 | // Return the number of segments we expect to produce. |
856 | size_t | |
857 | expected_segment_count() const; | |
858 | ||
535890bb ILT |
859 | // Set a flag to indicate that an object file uses the static TLS model. |
860 | void | |
861 | set_has_static_tls() | |
862 | { this->has_static_tls_ = true; } | |
863 | ||
864 | // Return true if any object file uses the static TLS model. | |
865 | bool | |
866 | has_static_tls() const | |
867 | { return this->has_static_tls_; } | |
868 | ||
e5756efb ILT |
869 | // Return the options which may be set by a linker script. |
870 | Script_options* | |
871 | script_options() | |
872 | { return this->script_options_; } | |
873 | ||
874 | const Script_options* | |
875 | script_options() const | |
876 | { return this->script_options_; } | |
d391083d | 877 | |
3ce2c28e ILT |
878 | // Return the object managing inputs in incremental build. NULL in |
879 | // non-incremental builds. | |
880 | Incremental_inputs* | |
09ec0418 | 881 | incremental_inputs() const |
3ce2c28e ILT |
882 | { return this->incremental_inputs_; } |
883 | ||
ea715a34 ILT |
884 | // For the target-specific code to add dynamic tags which are common |
885 | // to most targets. | |
886 | void | |
887 | add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
888 | const Output_data* plt_rel, | |
3a44184e | 889 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 890 | bool add_debug, bool dynrel_includes_plt); |
ea715a34 | 891 | |
8ed814a9 ILT |
892 | // Compute and write out the build ID if needed. |
893 | void | |
894 | write_build_id(Output_file*) const; | |
895 | ||
516cb3d0 ILT |
896 | // Rewrite output file in binary format. |
897 | void | |
898 | write_binary(Output_file* in) const; | |
899 | ||
7d9e3d98 ILT |
900 | // Print output sections to the map file. |
901 | void | |
902 | print_to_mapfile(Mapfile*) const; | |
903 | ||
ad8f37d1 ILT |
904 | // Dump statistical information to stderr. |
905 | void | |
906 | print_stats() const; | |
907 | ||
a445fddf | 908 | // A list of segments. |
54dc6425 ILT |
909 | |
910 | typedef std::vector<Output_segment*> Segment_list; | |
911 | ||
a445fddf | 912 | // A list of sections. |
54dc6425 | 913 | |
a3ad94ed | 914 | typedef std::vector<Output_section*> Section_list; |
54dc6425 ILT |
915 | |
916 | // The list of information to write out which is not attached to | |
917 | // either a section or a segment. | |
a3ad94ed | 918 | typedef std::vector<Output_data*> Data_list; |
54dc6425 | 919 | |
a445fddf ILT |
920 | // Store the allocated sections into the section list. This is used |
921 | // by the linker script code. | |
922 | void | |
923 | get_allocated_sections(Section_list*) const; | |
924 | ||
ec661b9d AM |
925 | // Store the executable sections into the section list. |
926 | void | |
927 | get_executable_sections(Section_list*) const; | |
928 | ||
919ed24c ILT |
929 | // Make a section for a linker script to hold data. |
930 | Output_section* | |
1e5d2fb1 DK |
931 | make_output_section_for_script(const char* name, |
932 | Script_sections::Section_type section_type); | |
919ed24c | 933 | |
a445fddf ILT |
934 | // Make a segment. This is used by the linker script code. |
935 | Output_segment* | |
936 | make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags); | |
937 | ||
938 | // Return the number of segments. | |
939 | size_t | |
940 | segment_count() const | |
941 | { return this->segment_list_.size(); } | |
942 | ||
943 | // Map from section flags to segment flags. | |
944 | static elfcpp::Elf_Word | |
945 | section_flags_to_segment(elfcpp::Elf_Xword flags); | |
946 | ||
154e0e9a ILT |
947 | // Attach sections to segments. |
948 | void | |
2e702c99 | 949 | attach_sections_to_segments(const Target*); |
154e0e9a | 950 | |
20e6d0d6 DK |
951 | // For relaxation clean up, we need to know output section data created |
952 | // from a linker script. | |
953 | void | |
954 | new_output_section_data_from_script(Output_section_data* posd) | |
955 | { | |
956 | if (this->record_output_section_data_from_script_) | |
957 | this->script_output_section_data_list_.push_back(posd); | |
958 | } | |
959 | ||
c0a62865 DK |
960 | // Return section list. |
961 | const Section_list& | |
962 | section_list() const | |
963 | { return this->section_list_; } | |
964 | ||
b9b2ae8b NC |
965 | // Returns TRUE iff NAME (an input section from RELOBJ) will |
966 | // be mapped to an output section that should be KEPT. | |
967 | bool | |
968 | keep_input_section(const Relobj*, const char*); | |
969 | ||
a2fb1b05 ILT |
970 | private: |
971 | Layout(const Layout&); | |
972 | Layout& operator=(const Layout&); | |
973 | ||
dff16297 ILT |
974 | // Mapping from input section names to output section names. |
975 | struct Section_name_mapping | |
a2fb1b05 ILT |
976 | { |
977 | const char* from; | |
978 | int fromlen; | |
979 | const char* to; | |
ead1e424 | 980 | int tolen; |
a2fb1b05 | 981 | }; |
dff16297 ILT |
982 | static const Section_name_mapping section_name_mapping[]; |
983 | static const int section_name_mapping_count; | |
a2fb1b05 | 984 | |
755ab8af ILT |
985 | // During a relocatable link, a list of group sections and |
986 | // signatures. | |
987 | struct Group_signature | |
988 | { | |
989 | // The group section. | |
990 | Output_section* section; | |
991 | // The signature. | |
992 | const char* signature; | |
993 | ||
994 | Group_signature() | |
995 | : section(NULL), signature(NULL) | |
996 | { } | |
997 | ||
998 | Group_signature(Output_section* sectiona, const char* signaturea) | |
999 | : section(sectiona), signature(signaturea) | |
1000 | { } | |
1001 | }; | |
1002 | typedef std::vector<Group_signature> Group_signatures; | |
1003 | ||
ef4ab7a8 | 1004 | // Create a note section, filling in the header. |
8ed814a9 | 1005 | Output_section* |
ca09d69a | 1006 | create_note(const char* name, int note_type, const char* section_name, |
ef4ab7a8 | 1007 | size_t descsz, bool allocate, size_t* trailing_padding); |
8ed814a9 | 1008 | |
ef4ab7a8 | 1009 | // Create a note section for gold version. |
4f211c8b | 1010 | void |
35cdfc9a ILT |
1011 | create_gold_note(); |
1012 | ||
1013 | // Record whether the stack must be executable. | |
1014 | void | |
9c547ec3 | 1015 | create_executable_stack_info(); |
4f211c8b | 1016 | |
8ed814a9 ILT |
1017 | // Create a build ID note if needed. |
1018 | void | |
1019 | create_build_id(); | |
1020 | ||
1518dc8f ILT |
1021 | // Link .stab and .stabstr sections. |
1022 | void | |
1023 | link_stabs_sections(); | |
1024 | ||
3ce2c28e ILT |
1025 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
1026 | // for the next run of incremental linking to check what has changed. | |
1027 | void | |
09ec0418 | 1028 | create_incremental_info_sections(Symbol_table*); |
3ce2c28e | 1029 | |
75f65a3e ILT |
1030 | // Find the first read-only PT_LOAD segment, creating one if |
1031 | // necessary. | |
1032 | Output_segment* | |
2e702c99 | 1033 | find_first_load_seg(const Target*); |
75f65a3e | 1034 | |
7bf1f802 ILT |
1035 | // Count the local symbols in the regular symbol table and the dynamic |
1036 | // symbol table, and build the respective string pools. | |
1037 | void | |
17a1d0a9 | 1038 | count_local_symbols(const Task*, const Input_objects*); |
7bf1f802 | 1039 | |
54dc6425 ILT |
1040 | // Create the output sections for the symbol table. |
1041 | void | |
d491d34e ILT |
1042 | create_symtab_sections(const Input_objects*, Symbol_table*, |
1043 | unsigned int, off_t*); | |
54dc6425 | 1044 | |
75f65a3e ILT |
1045 | // Create the .shstrtab section. |
1046 | Output_section* | |
1047 | create_shstrtab(); | |
1048 | ||
1049 | // Create the section header table. | |
27bc2bce | 1050 | void |
d491d34e | 1051 | create_shdrs(const Output_section* shstrtab_section, off_t*); |
54dc6425 | 1052 | |
dbe717ef ILT |
1053 | // Create the dynamic symbol table. |
1054 | void | |
9b07f471 ILT |
1055 | create_dynamic_symtab(const Input_objects*, Symbol_table*, |
1056 | Output_section** pdynstr, | |
14b31740 ILT |
1057 | unsigned int* plocal_dynamic_count, |
1058 | std::vector<Symbol*>* pdynamic_symbols, | |
1059 | Versions* versions); | |
dbe717ef | 1060 | |
7bf1f802 ILT |
1061 | // Assign offsets to each local portion of the dynamic symbol table. |
1062 | void | |
1063 | assign_local_dynsym_offsets(const Input_objects*); | |
1064 | ||
a3ad94ed | 1065 | // Finish the .dynamic section and PT_DYNAMIC segment. |
dbe717ef | 1066 | void |
16649710 | 1067 | finish_dynamic_section(const Input_objects*, const Symbol_table*); |
dbe717ef | 1068 | |
f0ba79e2 ILT |
1069 | // Set the size of the _DYNAMIC symbol. |
1070 | void | |
1071 | set_dynamic_symbol_size(const Symbol_table*); | |
1072 | ||
dbe717ef ILT |
1073 | // Create the .interp section and PT_INTERP segment. |
1074 | void | |
1075 | create_interp(const Target* target); | |
1076 | ||
14b31740 ILT |
1077 | // Create the version sections. |
1078 | void | |
9025d29d | 1079 | create_version_sections(const Versions*, |
46fe1623 | 1080 | const Symbol_table*, |
14b31740 ILT |
1081 | unsigned int local_symcount, |
1082 | const std::vector<Symbol*>& dynamic_symbols, | |
1083 | const Output_section* dynstr); | |
1084 | ||
1085 | template<int size, bool big_endian> | |
1086 | void | |
1087 | sized_create_version_sections(const Versions* versions, | |
46fe1623 | 1088 | const Symbol_table*, |
14b31740 ILT |
1089 | unsigned int local_symcount, |
1090 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 1091 | const Output_section* dynstr); |
14b31740 | 1092 | |
a2fb1b05 ILT |
1093 | // Return whether to include this section in the link. |
1094 | template<int size, bool big_endian> | |
1095 | bool | |
6fa2a40b | 1096 | include_section(Sized_relobj_file<size, big_endian>* object, const char* name, |
a2fb1b05 ILT |
1097 | const elfcpp::Shdr<size, big_endian>&); |
1098 | ||
ead1e424 ILT |
1099 | // Return the output section name to use given an input section |
1100 | // name. Set *PLEN to the length of the name. *PLEN must be | |
1101 | // initialized to the length of NAME. | |
1102 | static const char* | |
5393d741 | 1103 | output_section_name(const Relobj*, const char* name, size_t* plen); |
ead1e424 | 1104 | |
d491d34e ILT |
1105 | // Return the number of allocated output sections. |
1106 | size_t | |
1107 | allocated_output_section_count() const; | |
1108 | ||
ead1e424 ILT |
1109 | // Return the output section for NAME, TYPE and FLAGS. |
1110 | Output_section* | |
f0641a0b | 1111 | get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 1112 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 1113 | Output_section_order order, bool is_relro); |
a2fb1b05 | 1114 | |
16164a6b ST |
1115 | // Clear the input section flags that should not be copied to the |
1116 | // output section. | |
1117 | elfcpp::Elf_Xword | |
1118 | get_output_section_flags (elfcpp::Elf_Xword input_section_flags); | |
1119 | ||
a445fddf ILT |
1120 | // Choose the output section for NAME in RELOBJ. |
1121 | Output_section* | |
1122 | choose_output_section(const Relobj* relobj, const char* name, | |
1123 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
1124 | bool is_input_section, Output_section_order order, |
1125 | bool is_relro); | |
a445fddf | 1126 | |
a2fb1b05 ILT |
1127 | // Create a new Output_section. |
1128 | Output_section* | |
1129 | make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1130 | elfcpp::Elf_Xword flags, Output_section_order order, |
1131 | bool is_relro); | |
a2fb1b05 | 1132 | |
4e2b1697 ILT |
1133 | // Attach a section to a segment. |
1134 | void | |
2e702c99 | 1135 | attach_section_to_segment(const Target*, Output_section*); |
4e2b1697 | 1136 | |
22f0da72 ILT |
1137 | // Get section order. |
1138 | Output_section_order | |
1139 | default_section_order(Output_section*, bool is_relro_local); | |
1140 | ||
154e0e9a | 1141 | // Attach an allocated section to a segment. |
1650c4ff | 1142 | void |
2e702c99 | 1143 | attach_allocated_section_to_segment(const Target*, Output_section*); |
1650c4ff | 1144 | |
07a60597 ILT |
1145 | // Make the .eh_frame section. |
1146 | Output_section* | |
1147 | make_eh_frame_section(const Relobj*); | |
1148 | ||
dbe717ef ILT |
1149 | // Set the final file offsets of all the segments. |
1150 | off_t | |
1151 | set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx); | |
1152 | ||
6a74a719 ILT |
1153 | // Set the file offsets of the sections when doing a relocatable |
1154 | // link. | |
1155 | off_t | |
1156 | set_relocatable_section_offsets(Output_data*, unsigned int* pshndx); | |
1157 | ||
86887060 | 1158 | // Set the final file offsets of all the sections not associated |
9a0910c3 ILT |
1159 | // with a segment. We set section offsets in three passes: the |
1160 | // first handles all allocated sections, the second sections that | |
17a1d0a9 ILT |
1161 | // require postprocessing, and the last the late-bound STRTAB |
1162 | // sections (probably only shstrtab, which is the one we care about | |
1163 | // because it holds section names). | |
9a0910c3 ILT |
1164 | enum Section_offset_pass |
1165 | { | |
1166 | BEFORE_INPUT_SECTIONS_PASS, | |
17a1d0a9 ILT |
1167 | POSTPROCESSING_SECTIONS_PASS, |
1168 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS | |
9a0910c3 | 1169 | }; |
dbe717ef | 1170 | off_t |
9a0910c3 ILT |
1171 | set_section_offsets(off_t, Section_offset_pass pass); |
1172 | ||
86887060 ILT |
1173 | // Set the final section indexes of all the sections not associated |
1174 | // with a segment. Returns the next unused index. | |
1175 | unsigned int | |
1176 | set_section_indexes(unsigned int pshndx); | |
dbe717ef | 1177 | |
a445fddf ILT |
1178 | // Set the section addresses when using a script. |
1179 | Output_segment* | |
1180 | set_section_addresses_from_script(Symbol_table*); | |
1181 | ||
20e6d0d6 DK |
1182 | // Find appropriate places or orphan sections in a script. |
1183 | void | |
1184 | place_orphan_sections_in_script(); | |
1185 | ||
a2fb1b05 | 1186 | // Return whether SEG1 comes before SEG2 in the output file. |
aecf301f | 1187 | bool |
b3168e9d | 1188 | segment_precedes(const Output_segment* seg1, const Output_segment* seg2); |
a2fb1b05 | 1189 | |
2e702c99 | 1190 | // Use to save and restore segments during relaxation. |
20e6d0d6 DK |
1191 | typedef Unordered_map<const Output_segment*, const Output_segment*> |
1192 | Segment_states; | |
1193 | ||
1194 | // Save states of current output segments. | |
1195 | void | |
1196 | save_segments(Segment_states*); | |
1197 | ||
1198 | // Restore output segment states. | |
1199 | void | |
1200 | restore_segments(const Segment_states*); | |
1201 | ||
1202 | // Clean up after relaxation so that it is possible to lay out the | |
1203 | // sections and segments again. | |
1204 | void | |
1205 | clean_up_after_relaxation(); | |
1206 | ||
1207 | // Doing preparation work for relaxation. This is factored out to make | |
1208 | // Layout::finalized a bit smaller and easier to read. | |
1209 | void | |
1210 | prepare_for_relaxation(); | |
1211 | ||
1212 | // Main body of the relaxation loop, which lays out the section. | |
1213 | off_t | |
1214 | relaxation_loop_body(int, Target*, Symbol_table*, Output_segment**, | |
1215 | Output_segment*, Output_segment_headers*, | |
1216 | Output_file_header*, unsigned int*); | |
1217 | ||
8a4c0b0d | 1218 | // A mapping used for kept comdats/.gnu.linkonce group signatures. |
e94cf127 | 1219 | typedef Unordered_map<std::string, Kept_section> Signatures; |
a2fb1b05 ILT |
1220 | |
1221 | // Mapping from input section name/type/flags to output section. We | |
1222 | // use canonicalized strings here. | |
1223 | ||
f0641a0b | 1224 | typedef std::pair<Stringpool::Key, |
a2fb1b05 ILT |
1225 | std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key; |
1226 | ||
1227 | struct Hash_key | |
1228 | { | |
1229 | size_t | |
1230 | operator()(const Key& k) const; | |
1231 | }; | |
1232 | ||
1233 | typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map; | |
1234 | ||
1235 | // A comparison class for segments. | |
1236 | ||
aecf301f | 1237 | class Compare_segments |
a2fb1b05 | 1238 | { |
aecf301f ILT |
1239 | public: |
1240 | Compare_segments(Layout* layout) | |
1241 | : layout_(layout) | |
1242 | { } | |
1243 | ||
a2fb1b05 ILT |
1244 | bool |
1245 | operator()(const Output_segment* seg1, const Output_segment* seg2) | |
aecf301f ILT |
1246 | { return this->layout_->segment_precedes(seg1, seg2); } |
1247 | ||
1248 | private: | |
1249 | Layout* layout_; | |
a2fb1b05 ILT |
1250 | }; |
1251 | ||
20e6d0d6 DK |
1252 | typedef std::vector<Output_section_data*> Output_section_data_list; |
1253 | ||
1254 | // Debug checker class. | |
1255 | class Relaxation_debug_check | |
1256 | { | |
1257 | public: | |
1258 | Relaxation_debug_check() | |
1259 | : section_infos_() | |
1260 | { } | |
2e702c99 | 1261 | |
20e6d0d6 DK |
1262 | // Check that sections and special data are in reset states. |
1263 | void | |
1264 | check_output_data_for_reset_values(const Layout::Section_list&, | |
1265 | const Layout::Data_list&); | |
2e702c99 | 1266 | |
20e6d0d6 DK |
1267 | // Record information of a section list. |
1268 | void | |
1269 | read_sections(const Layout::Section_list&); | |
1270 | ||
1271 | // Verify a section list with recorded information. | |
1272 | void | |
1273 | verify_sections(const Layout::Section_list&); | |
2e702c99 | 1274 | |
20e6d0d6 DK |
1275 | private: |
1276 | // Information we care about a section. | |
1277 | struct Section_info | |
1278 | { | |
1279 | // Output section described by this. | |
1280 | Output_section* output_section; | |
1281 | // Load address. | |
1282 | uint64_t address; | |
1283 | // Data size. | |
1284 | off_t data_size; | |
1285 | // File offset. | |
1286 | off_t offset; | |
1287 | }; | |
1288 | ||
1289 | // Section information. | |
1290 | std::vector<Section_info> section_infos_; | |
1291 | }; | |
1292 | ||
e55bde5e ILT |
1293 | // The number of input files, for sizing tables. |
1294 | int number_of_input_files_; | |
e5756efb ILT |
1295 | // Information set by scripts or by command line options. |
1296 | Script_options* script_options_; | |
a2fb1b05 ILT |
1297 | // The output section names. |
1298 | Stringpool namepool_; | |
75f65a3e ILT |
1299 | // The output symbol names. |
1300 | Stringpool sympool_; | |
a3ad94ed ILT |
1301 | // The dynamic strings, if needed. |
1302 | Stringpool dynpool_; | |
a2fb1b05 ILT |
1303 | // The list of group sections and linkonce sections which we have seen. |
1304 | Signatures signatures_; | |
1305 | // The mapping from input section name/type/flags to output sections. | |
1306 | Section_name_map section_name_map_; | |
1307 | // The list of output segments. | |
1308 | Segment_list segment_list_; | |
a3ad94ed ILT |
1309 | // The list of output sections. |
1310 | Section_list section_list_; | |
a2fb1b05 ILT |
1311 | // The list of output sections which are not attached to any output |
1312 | // segment. | |
a3ad94ed ILT |
1313 | Section_list unattached_section_list_; |
1314 | // The list of unattached Output_data objects which require special | |
1315 | // handling because they are not Output_sections. | |
61ba1cf9 | 1316 | Data_list special_output_list_; |
27bc2bce ILT |
1317 | // The section headers. |
1318 | Output_section_headers* section_headers_; | |
92e059d8 ILT |
1319 | // A pointer to the PT_TLS segment if there is one. |
1320 | Output_segment* tls_segment_; | |
9f1d377b ILT |
1321 | // A pointer to the PT_GNU_RELRO segment if there is one. |
1322 | Output_segment* relro_segment_; | |
10b4f102 ILT |
1323 | // A pointer to the PT_INTERP segment if there is one. |
1324 | Output_segment* interp_segment_; | |
1a2dff53 ILT |
1325 | // A backend may increase the size of the PT_GNU_RELRO segment if |
1326 | // there is one. This is the amount to increase it by. | |
1327 | unsigned int increase_relro_; | |
a3ad94ed ILT |
1328 | // The SHT_SYMTAB output section. |
1329 | Output_section* symtab_section_; | |
d491d34e ILT |
1330 | // The SHT_SYMTAB_SHNDX for the regular symbol table if there is one. |
1331 | Output_symtab_xindex* symtab_xindex_; | |
a3ad94ed ILT |
1332 | // The SHT_DYNSYM output section if there is one. |
1333 | Output_section* dynsym_section_; | |
d491d34e ILT |
1334 | // The SHT_SYMTAB_SHNDX for the dynamic symbol table if there is one. |
1335 | Output_symtab_xindex* dynsym_xindex_; | |
a3ad94ed ILT |
1336 | // The SHT_DYNAMIC output section if there is one. |
1337 | Output_section* dynamic_section_; | |
f0ba79e2 ILT |
1338 | // The _DYNAMIC symbol if there is one. |
1339 | Symbol* dynamic_symbol_; | |
16649710 ILT |
1340 | // The dynamic data which goes into dynamic_section_. |
1341 | Output_data_dynamic* dynamic_data_; | |
730cdc88 | 1342 | // The exception frame output section if there is one. |
3151305a | 1343 | Output_section* eh_frame_section_; |
730cdc88 ILT |
1344 | // The exception frame data for eh_frame_section_. |
1345 | Eh_frame* eh_frame_data_; | |
2c38906f ILT |
1346 | // Whether we have added eh_frame_data_ to the .eh_frame section. |
1347 | bool added_eh_frame_data_; | |
730cdc88 ILT |
1348 | // The exception frame header output section if there is one. |
1349 | Output_section* eh_frame_hdr_section_; | |
c1027032 CC |
1350 | // The data for the .gdb_index section. |
1351 | Gdb_index* gdb_index_data_; | |
8ed814a9 ILT |
1352 | // The space for the build ID checksum if there is one. |
1353 | Output_section_data* build_id_note_; | |
62b01cb5 ILT |
1354 | // The output section containing dwarf abbreviations |
1355 | Output_reduced_debug_abbrev_section* debug_abbrev_; | |
1356 | // The output section containing the dwarf debug info tree | |
1357 | Output_reduced_debug_info_section* debug_info_; | |
755ab8af ILT |
1358 | // A list of group sections and their signatures. |
1359 | Group_signatures group_signatures_; | |
e44fcf3b ILT |
1360 | // The size of the output file. |
1361 | off_t output_file_size_; | |
d7bb5745 ILT |
1362 | // Whether we have added an input section to an output section. |
1363 | bool have_added_input_section_; | |
e55bde5e ILT |
1364 | // Whether we have attached the sections to the segments. |
1365 | bool sections_are_attached_; | |
35cdfc9a ILT |
1366 | // Whether we have seen an object file marked to require an |
1367 | // executable stack. | |
1368 | bool input_requires_executable_stack_; | |
1369 | // Whether we have seen at least one object file with an executable | |
1370 | // stack marker. | |
1371 | bool input_with_gnu_stack_note_; | |
1372 | // Whether we have seen at least one object file without an | |
1373 | // executable stack marker. | |
1374 | bool input_without_gnu_stack_note_; | |
535890bb ILT |
1375 | // Whether we have seen an object file that uses the static TLS model. |
1376 | bool has_static_tls_; | |
17a1d0a9 ILT |
1377 | // Whether any sections require postprocessing. |
1378 | bool any_postprocessing_sections_; | |
e55bde5e ILT |
1379 | // Whether we have resized the signatures_ hash table. |
1380 | bool resized_signatures_; | |
1518dc8f ILT |
1381 | // Whether we have created a .stab*str output section. |
1382 | bool have_stabstr_section_; | |
e9552f7e ST |
1383 | // True if the input sections in the output sections should be sorted |
1384 | // as specified in a section ordering file. | |
1385 | bool section_ordering_specified_; | |
16164a6b ST |
1386 | // True if some input sections need to be mapped to a unique segment, |
1387 | // after being mapped to a unique Output_section. | |
1388 | bool unique_segment_for_sections_specified_; | |
3ce2c28e ILT |
1389 | // In incremental build, holds information check the inputs and build the |
1390 | // .gnu_incremental_inputs section. | |
1391 | Incremental_inputs* incremental_inputs_; | |
20e6d0d6 DK |
1392 | // Whether we record output section data created in script |
1393 | bool record_output_section_data_from_script_; | |
9b547ce6 | 1394 | // List of output data that needs to be removed at relaxation clean up. |
20e6d0d6 DK |
1395 | Output_section_data_list script_output_section_data_list_; |
1396 | // Structure to save segment states before entering the relaxation loop. | |
1397 | Segment_states* segment_states_; | |
1398 | // A relaxation debug checker. We only create one when in debugging mode. | |
1399 | Relaxation_debug_check* relaxation_debug_check_; | |
f0558624 ST |
1400 | // Plugins specify section_ordering using this map. This is set in |
1401 | // update_section_order in plugin.cc | |
1402 | std::map<Section_id, unsigned int> section_order_map_; | |
16164a6b ST |
1403 | // This maps an input section to a unique segment. This is done by first |
1404 | // placing such input sections in unique output sections and then mapping | |
1405 | // the output section to a unique segment. Unique_segment_info stores | |
1406 | // any additional flags and alignment of the new segment. | |
1407 | Section_segment_map section_segment_map_; | |
6e9ba2ca ST |
1408 | // Hash a pattern to its position in the section ordering file. |
1409 | Unordered_map<std::string, unsigned int> input_section_position_; | |
1410 | // Vector of glob only patterns in the section_ordering file. | |
1411 | std::vector<std::string> input_section_glob_; | |
cdc29364 CC |
1412 | // For incremental links, the base file to be modified. |
1413 | Incremental_binary* incremental_base_; | |
1414 | // For incremental links, a list of free space within the file. | |
1415 | Free_list free_list_; | |
61ba1cf9 ILT |
1416 | }; |
1417 | ||
730cdc88 ILT |
1418 | // This task handles writing out data in output sections which is not |
1419 | // part of an input section, or which requires special handling. When | |
1420 | // this is done, it unblocks both output_sections_blocker and | |
1421 | // final_blocker. | |
1422 | ||
1423 | class Write_sections_task : public Task | |
1424 | { | |
1425 | public: | |
1426 | Write_sections_task(const Layout* layout, Output_file* of, | |
1427 | Task_token* output_sections_blocker, | |
1428 | Task_token* final_blocker) | |
1429 | : layout_(layout), of_(of), | |
1430 | output_sections_blocker_(output_sections_blocker), | |
1431 | final_blocker_(final_blocker) | |
1432 | { } | |
1433 | ||
1434 | // The standard Task methods. | |
1435 | ||
17a1d0a9 ILT |
1436 | Task_token* |
1437 | is_runnable(); | |
730cdc88 | 1438 | |
17a1d0a9 ILT |
1439 | void |
1440 | locks(Task_locker*); | |
730cdc88 ILT |
1441 | |
1442 | void | |
1443 | run(Workqueue*); | |
1444 | ||
c7912668 ILT |
1445 | std::string |
1446 | get_name() const | |
1447 | { return "Write_sections_task"; } | |
1448 | ||
730cdc88 ILT |
1449 | private: |
1450 | class Write_sections_locker; | |
1451 | ||
1452 | const Layout* layout_; | |
1453 | Output_file* of_; | |
1454 | Task_token* output_sections_blocker_; | |
1455 | Task_token* final_blocker_; | |
1456 | }; | |
1457 | ||
61ba1cf9 ILT |
1458 | // This task handles writing out data which is not part of a section |
1459 | // or segment. | |
1460 | ||
1461 | class Write_data_task : public Task | |
1462 | { | |
1463 | public: | |
a3ad94ed | 1464 | Write_data_task(const Layout* layout, const Symbol_table* symtab, |
9025d29d ILT |
1465 | Output_file* of, Task_token* final_blocker) |
1466 | : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker) | |
61ba1cf9 ILT |
1467 | { } |
1468 | ||
1469 | // The standard Task methods. | |
1470 | ||
17a1d0a9 ILT |
1471 | Task_token* |
1472 | is_runnable(); | |
61ba1cf9 | 1473 | |
17a1d0a9 ILT |
1474 | void |
1475 | locks(Task_locker*); | |
61ba1cf9 ILT |
1476 | |
1477 | void | |
1478 | run(Workqueue*); | |
1479 | ||
c7912668 ILT |
1480 | std::string |
1481 | get_name() const | |
1482 | { return "Write_data_task"; } | |
1483 | ||
61ba1cf9 ILT |
1484 | private: |
1485 | const Layout* layout_; | |
a3ad94ed | 1486 | const Symbol_table* symtab_; |
61ba1cf9 ILT |
1487 | Output_file* of_; |
1488 | Task_token* final_blocker_; | |
1489 | }; | |
1490 | ||
1491 | // This task handles writing out the global symbols. | |
1492 | ||
1493 | class Write_symbols_task : public Task | |
1494 | { | |
1495 | public: | |
d491d34e | 1496 | Write_symbols_task(const Layout* layout, const Symbol_table* symtab, |
9a2d6984 | 1497 | const Input_objects* input_objects, |
16649710 ILT |
1498 | const Stringpool* sympool, const Stringpool* dynpool, |
1499 | Output_file* of, Task_token* final_blocker) | |
d491d34e ILT |
1500 | : layout_(layout), symtab_(symtab), input_objects_(input_objects), |
1501 | sympool_(sympool), dynpool_(dynpool), of_(of), | |
1502 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
1503 | { } |
1504 | ||
1505 | // The standard Task methods. | |
1506 | ||
17a1d0a9 ILT |
1507 | Task_token* |
1508 | is_runnable(); | |
61ba1cf9 | 1509 | |
17a1d0a9 ILT |
1510 | void |
1511 | locks(Task_locker*); | |
61ba1cf9 ILT |
1512 | |
1513 | void | |
1514 | run(Workqueue*); | |
1515 | ||
c7912668 ILT |
1516 | std::string |
1517 | get_name() const | |
1518 | { return "Write_symbols_task"; } | |
1519 | ||
61ba1cf9 | 1520 | private: |
d491d34e | 1521 | const Layout* layout_; |
61ba1cf9 | 1522 | const Symbol_table* symtab_; |
9a2d6984 | 1523 | const Input_objects* input_objects_; |
61ba1cf9 | 1524 | const Stringpool* sympool_; |
16649710 | 1525 | const Stringpool* dynpool_; |
61ba1cf9 ILT |
1526 | Output_file* of_; |
1527 | Task_token* final_blocker_; | |
1528 | }; | |
1529 | ||
730cdc88 ILT |
1530 | // This task handles writing out data in output sections which can't |
1531 | // be written out until all the input sections have been handled. | |
1532 | // This is for sections whose contents is based on the contents of | |
1533 | // other output sections. | |
1534 | ||
1535 | class Write_after_input_sections_task : public Task | |
1536 | { | |
1537 | public: | |
27bc2bce | 1538 | Write_after_input_sections_task(Layout* layout, Output_file* of, |
730cdc88 ILT |
1539 | Task_token* input_sections_blocker, |
1540 | Task_token* final_blocker) | |
1541 | : layout_(layout), of_(of), | |
1542 | input_sections_blocker_(input_sections_blocker), | |
1543 | final_blocker_(final_blocker) | |
1544 | { } | |
1545 | ||
1546 | // The standard Task methods. | |
1547 | ||
17a1d0a9 ILT |
1548 | Task_token* |
1549 | is_runnable(); | |
730cdc88 | 1550 | |
17a1d0a9 ILT |
1551 | void |
1552 | locks(Task_locker*); | |
730cdc88 ILT |
1553 | |
1554 | void | |
1555 | run(Workqueue*); | |
1556 | ||
c7912668 ILT |
1557 | std::string |
1558 | get_name() const | |
1559 | { return "Write_after_input_sections_task"; } | |
1560 | ||
730cdc88 | 1561 | private: |
27bc2bce | 1562 | Layout* layout_; |
730cdc88 ILT |
1563 | Output_file* of_; |
1564 | Task_token* input_sections_blocker_; | |
1565 | Task_token* final_blocker_; | |
1566 | }; | |
1567 | ||
92e059d8 | 1568 | // This task function handles closing the file. |
61ba1cf9 | 1569 | |
92e059d8 | 1570 | class Close_task_runner : public Task_function_runner |
61ba1cf9 ILT |
1571 | { |
1572 | public: | |
516cb3d0 ILT |
1573 | Close_task_runner(const General_options* options, const Layout* layout, |
1574 | Output_file* of) | |
1575 | : options_(options), layout_(layout), of_(of) | |
61ba1cf9 ILT |
1576 | { } |
1577 | ||
92e059d8 | 1578 | // Run the operation. |
61ba1cf9 | 1579 | void |
17a1d0a9 | 1580 | run(Workqueue*, const Task*); |
61ba1cf9 ILT |
1581 | |
1582 | private: | |
516cb3d0 ILT |
1583 | const General_options* options_; |
1584 | const Layout* layout_; | |
61ba1cf9 | 1585 | Output_file* of_; |
a2fb1b05 ILT |
1586 | }; |
1587 | ||
ead1e424 ILT |
1588 | // A small helper function to align an address. |
1589 | ||
1590 | inline uint64_t | |
1591 | align_address(uint64_t address, uint64_t addralign) | |
1592 | { | |
1593 | if (addralign != 0) | |
1594 | address = (address + addralign - 1) &~ (addralign - 1); | |
1595 | return address; | |
1596 | } | |
1597 | ||
a2fb1b05 ILT |
1598 | } // End namespace gold. |
1599 | ||
1600 | #endif // !defined(GOLD_LAYOUT_H) |