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a2fb1b05 ILT |
1 | // layout.h -- lay out output file sections for gold -*- C++ -*- |
2 | ||
fd67aa11 | 3 | // Copyright (C) 2006-2024 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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. | |
22 | ||
a2fb1b05 ILT |
23 | #ifndef GOLD_LAYOUT_H |
24 | #define GOLD_LAYOUT_H | |
25 | ||
e94cf127 | 26 | #include <cstring> |
a2fb1b05 | 27 | #include <list> |
1ef4d87f | 28 | #include <map> |
a2fb1b05 ILT |
29 | #include <string> |
30 | #include <utility> | |
31 | #include <vector> | |
32 | ||
e5756efb | 33 | #include "script.h" |
a2fb1b05 ILT |
34 | #include "workqueue.h" |
35 | #include "object.h" | |
14b31740 | 36 | #include "dynobj.h" |
a2fb1b05 ILT |
37 | #include "stringpool.h" |
38 | ||
39 | namespace gold | |
40 | { | |
41 | ||
ead1e424 | 42 | class General_options; |
3ce2c28e | 43 | class Incremental_inputs; |
cdc29364 | 44 | class Incremental_binary; |
54dc6425 | 45 | class Input_objects; |
7d9e3d98 | 46 | class Mapfile; |
75f65a3e | 47 | class Symbol_table; |
ead1e424 | 48 | class Output_section_data; |
a2fb1b05 | 49 | class Output_section; |
75f65a3e | 50 | class Output_section_headers; |
20e6d0d6 DK |
51 | class Output_segment_headers; |
52 | class Output_file_header; | |
a2fb1b05 | 53 | class Output_segment; |
54dc6425 | 54 | class Output_data; |
3a44184e | 55 | class Output_data_reloc_generic; |
a3ad94ed | 56 | class Output_data_dynamic; |
d491d34e | 57 | class Output_symtab_xindex; |
62b01cb5 ILT |
58 | class Output_reduced_debug_abbrev_section; |
59 | class Output_reduced_debug_info_section; | |
730cdc88 | 60 | class Eh_frame; |
c1027032 | 61 | class Gdb_index; |
61ba1cf9 | 62 | class Target; |
09ec0418 | 63 | struct Timespec; |
a2fb1b05 | 64 | |
a2e47362 CC |
65 | // Return TRUE if SECNAME is the name of a compressed debug section. |
66 | extern bool | |
67 | is_compressed_debug_section(const char* secname); | |
68 | ||
dd68f8fa CC |
69 | // Return the name of the corresponding uncompressed debug section. |
70 | extern std::string | |
71 | corresponding_uncompressed_section_name(std::string secname); | |
72 | ||
cdc29364 CC |
73 | // Maintain a list of free space within a section, segment, or file. |
74 | // Used for incremental update links. | |
75 | ||
76 | class Free_list | |
77 | { | |
78 | public: | |
8ea8cd50 CC |
79 | struct Free_list_node |
80 | { | |
81 | Free_list_node(off_t start, off_t end) | |
82 | : start_(start), end_(end) | |
83 | { } | |
84 | off_t start_; | |
85 | off_t end_; | |
86 | }; | |
87 | typedef std::list<Free_list_node>::const_iterator Const_iterator; | |
88 | ||
cdc29364 | 89 | Free_list() |
8ea8cd50 CC |
90 | : list_(), last_remove_(list_.begin()), extend_(false), length_(0), |
91 | min_hole_(0) | |
cdc29364 CC |
92 | { } |
93 | ||
8ea8cd50 CC |
94 | // Initialize the free list for a section of length LEN. |
95 | // If EXTEND is true, free space may be allocated past the end. | |
cdc29364 CC |
96 | void |
97 | init(off_t len, bool extend); | |
98 | ||
8ea8cd50 CC |
99 | // Set the minimum hole size that is allowed when allocating |
100 | // from the free list. | |
101 | void | |
102 | set_min_hole_size(off_t min_hole) | |
103 | { this->min_hole_ = min_hole; } | |
104 | ||
105 | // Remove a chunk from the free list. | |
cdc29364 CC |
106 | void |
107 | remove(off_t start, off_t end); | |
108 | ||
8ea8cd50 CC |
109 | // Allocate a chunk of space from the free list of length LEN, |
110 | // with alignment ALIGN, and minimum offset MINOFF. | |
cdc29364 CC |
111 | off_t |
112 | allocate(off_t len, uint64_t align, off_t minoff); | |
113 | ||
8ea8cd50 CC |
114 | // Return an iterator for the beginning of the free list. |
115 | Const_iterator | |
116 | begin() const | |
117 | { return this->list_.begin(); } | |
118 | ||
119 | // Return an iterator for the end of the free list. | |
120 | Const_iterator | |
121 | end() const | |
122 | { return this->list_.end(); } | |
123 | ||
124 | // Dump the free list (for debugging). | |
cdc29364 CC |
125 | void |
126 | dump(); | |
127 | ||
8ea8cd50 | 128 | // Print usage statistics. |
cdc29364 CC |
129 | static void |
130 | print_stats(); | |
131 | ||
132 | private: | |
cdc29364 CC |
133 | typedef std::list<Free_list_node>::iterator Iterator; |
134 | ||
135 | // The free list. | |
136 | std::list<Free_list_node> list_; | |
137 | ||
138 | // The last node visited during a remove operation. | |
139 | Iterator last_remove_; | |
140 | ||
141 | // Whether we can extend past the original length. | |
142 | bool extend_; | |
143 | ||
144 | // The total length of the section, segment, or file. | |
145 | off_t length_; | |
146 | ||
8ea8cd50 CC |
147 | // The minimum hole size allowed. When allocating from the free list, |
148 | // we must not leave a hole smaller than this. | |
149 | off_t min_hole_; | |
150 | ||
cdc29364 CC |
151 | // Statistics: |
152 | // The total number of free lists used. | |
153 | static unsigned int num_lists; | |
154 | // The total number of free list nodes used. | |
155 | static unsigned int num_nodes; | |
156 | // The total number of calls to Free_list::remove. | |
157 | static unsigned int num_removes; | |
158 | // The total number of nodes visited during calls to Free_list::remove. | |
159 | static unsigned int num_remove_visits; | |
160 | // The total number of calls to Free_list::allocate. | |
161 | static unsigned int num_allocates; | |
162 | // The total number of nodes visited during calls to Free_list::allocate. | |
163 | static unsigned int num_allocate_visits; | |
164 | }; | |
165 | ||
92e059d8 ILT |
166 | // This task function handles mapping the input sections to output |
167 | // sections and laying them out in memory. | |
a2fb1b05 | 168 | |
92e059d8 | 169 | class Layout_task_runner : public Task_function_runner |
a2fb1b05 ILT |
170 | { |
171 | public: | |
172 | // OPTIONS is the command line options, INPUT_OBJECTS is the list of | |
92e059d8 ILT |
173 | // input objects, SYMTAB is the symbol table, LAYOUT is the layout |
174 | // object. | |
175 | Layout_task_runner(const General_options& options, | |
176 | const Input_objects* input_objects, | |
177 | Symbol_table* symtab, | |
2e702c99 | 178 | Target* target, |
7d9e3d98 ILT |
179 | Layout* layout, |
180 | Mapfile* mapfile) | |
75f65a3e | 181 | : options_(options), input_objects_(input_objects), symtab_(symtab), |
7d9e3d98 | 182 | target_(target), layout_(layout), mapfile_(mapfile) |
a2fb1b05 ILT |
183 | { } |
184 | ||
92e059d8 | 185 | // Run the operation. |
a2fb1b05 | 186 | void |
17a1d0a9 | 187 | run(Workqueue*, const Task*); |
a2fb1b05 ILT |
188 | |
189 | private: | |
92e059d8 ILT |
190 | Layout_task_runner(const Layout_task_runner&); |
191 | Layout_task_runner& operator=(const Layout_task_runner&); | |
a2fb1b05 ILT |
192 | |
193 | const General_options& options_; | |
54dc6425 | 194 | const Input_objects* input_objects_; |
75f65a3e | 195 | Symbol_table* symtab_; |
8851ecca | 196 | Target* target_; |
12e14209 | 197 | Layout* layout_; |
7d9e3d98 | 198 | Mapfile* mapfile_; |
a2fb1b05 ILT |
199 | }; |
200 | ||
1ef4d87f ILT |
201 | // This class holds information about the comdat group or |
202 | // .gnu.linkonce section that will be kept for a given signature. | |
8a4c0b0d | 203 | |
1ef4d87f | 204 | class Kept_section |
8a4c0b0d | 205 | { |
1ef4d87f ILT |
206 | private: |
207 | // For a comdat group, we build a mapping from the name of each | |
208 | // section in the group to the section index and the size in object. | |
209 | // When we discard a group in some other object file, we use this | |
210 | // map to figure out which kept section the discarded section is | |
211 | // associated with. We then use that mapping when processing relocs | |
212 | // against discarded sections. | |
213 | struct Comdat_section_info | |
214 | { | |
215 | // The section index. | |
216 | unsigned int shndx; | |
217 | // The section size. | |
218 | uint64_t size; | |
219 | ||
220 | Comdat_section_info(unsigned int a_shndx, uint64_t a_size) | |
221 | : shndx(a_shndx), size(a_size) | |
222 | { } | |
223 | }; | |
224 | ||
225 | // Most comdat groups have only one or two sections, so we use a | |
226 | // std::map rather than an Unordered_map to optimize for that case | |
227 | // without paying too heavily for groups with more sections. | |
228 | typedef std::map<std::string, Comdat_section_info> Comdat_group; | |
229 | ||
230 | public: | |
8a4c0b0d | 231 | Kept_section() |
1ef4d87f ILT |
232 | : object_(NULL), shndx_(0), is_comdat_(false), is_group_name_(false) |
233 | { this->u_.linkonce_size = 0; } | |
234 | ||
235 | // We need to support copies for the signature map in the Layout | |
236 | // object, but we should never copy an object after it has been | |
237 | // marked as a comdat section. | |
238 | Kept_section(const Kept_section& k) | |
239 | : object_(k.object_), shndx_(k.shndx_), is_comdat_(false), | |
240 | is_group_name_(k.is_group_name_) | |
241 | { | |
242 | gold_assert(!k.is_comdat_); | |
243 | this->u_.linkonce_size = 0; | |
244 | } | |
245 | ||
246 | ~Kept_section() | |
247 | { | |
248 | if (this->is_comdat_) | |
249 | delete this->u_.group_sections; | |
250 | } | |
251 | ||
252 | // The object where this section lives. | |
253 | Relobj* | |
254 | object() const | |
255 | { return this->object_; } | |
8a4c0b0d | 256 | |
1ef4d87f ILT |
257 | // Set the object. |
258 | void | |
2ea97941 | 259 | set_object(Relobj* object) |
1ef4d87f ILT |
260 | { |
261 | gold_assert(this->object_ == NULL); | |
2ea97941 | 262 | this->object_ = object; |
1ef4d87f ILT |
263 | } |
264 | ||
265 | // The section index. | |
266 | unsigned int | |
267 | shndx() const | |
268 | { return this->shndx_; } | |
269 | ||
270 | // Set the section index. | |
271 | void | |
2ea97941 | 272 | set_shndx(unsigned int shndx) |
1ef4d87f ILT |
273 | { |
274 | gold_assert(this->shndx_ == 0); | |
2ea97941 | 275 | this->shndx_ = shndx; |
1ef4d87f ILT |
276 | } |
277 | ||
278 | // Whether this is a comdat group. | |
279 | bool | |
280 | is_comdat() const | |
281 | { return this->is_comdat_; } | |
282 | ||
283 | // Set that this is a comdat group. | |
284 | void | |
285 | set_is_comdat() | |
286 | { | |
287 | gold_assert(!this->is_comdat_); | |
288 | this->is_comdat_ = true; | |
289 | this->u_.group_sections = new Comdat_group(); | |
290 | } | |
8a4c0b0d | 291 | |
1ef4d87f ILT |
292 | // Whether this is associated with the name of a group or section |
293 | // rather than the symbol name derived from a linkonce section. | |
294 | bool | |
295 | is_group_name() const | |
296 | { return this->is_group_name_; } | |
297 | ||
298 | // Note that this represents a comdat group rather than a single | |
299 | // linkonce section. | |
300 | void | |
301 | set_is_group_name() | |
302 | { this->is_group_name_ = true; } | |
303 | ||
304 | // Add a section to the group list. | |
305 | void | |
2ea97941 | 306 | add_comdat_section(const std::string& name, unsigned int shndx, |
1ef4d87f ILT |
307 | uint64_t size) |
308 | { | |
309 | gold_assert(this->is_comdat_); | |
2ea97941 | 310 | Comdat_section_info sinfo(shndx, size); |
1ef4d87f ILT |
311 | this->u_.group_sections->insert(std::make_pair(name, sinfo)); |
312 | } | |
313 | ||
314 | // Look for a section name in the group list, and return whether it | |
315 | // was found. If found, returns the section index and size. | |
316 | bool | |
ca09d69a NC |
317 | find_comdat_section(const std::string& name, unsigned int* pshndx, |
318 | uint64_t* psize) const | |
1ef4d87f ILT |
319 | { |
320 | gold_assert(this->is_comdat_); | |
321 | Comdat_group::const_iterator p = this->u_.group_sections->find(name); | |
322 | if (p == this->u_.group_sections->end()) | |
323 | return false; | |
324 | *pshndx = p->second.shndx; | |
325 | *psize = p->second.size; | |
326 | return true; | |
327 | } | |
328 | ||
329 | // If there is only one section in the group list, return true, and | |
330 | // return the section index and size. | |
331 | bool | |
ca09d69a | 332 | find_single_comdat_section(unsigned int* pshndx, uint64_t* psize) const |
1ef4d87f ILT |
333 | { |
334 | gold_assert(this->is_comdat_); | |
335 | if (this->u_.group_sections->size() != 1) | |
336 | return false; | |
337 | Comdat_group::const_iterator p = this->u_.group_sections->begin(); | |
338 | *pshndx = p->second.shndx; | |
339 | *psize = p->second.size; | |
340 | return true; | |
341 | } | |
342 | ||
343 | // Return the size of a linkonce section. | |
344 | uint64_t | |
345 | linkonce_size() const | |
346 | { | |
347 | gold_assert(!this->is_comdat_); | |
348 | return this->u_.linkonce_size; | |
349 | } | |
350 | ||
351 | // Set the size of a linkonce section. | |
352 | void | |
353 | set_linkonce_size(uint64_t size) | |
354 | { | |
355 | gold_assert(!this->is_comdat_); | |
356 | this->u_.linkonce_size = size; | |
357 | } | |
358 | ||
359 | private: | |
360 | // No assignment. | |
361 | Kept_section& operator=(const Kept_section&); | |
362 | ||
363 | // The object containing the comdat group or .gnu.linkonce section. | |
364 | Relobj* object_; | |
365 | // Index of the group section for comdats and the section itself for | |
8a4c0b0d | 366 | // .gnu.linkonce. |
1ef4d87f ILT |
367 | unsigned int shndx_; |
368 | // True if this is for a comdat group rather than a .gnu.linkonce | |
369 | // section. | |
370 | bool is_comdat_; | |
8a4c0b0d ILT |
371 | // The Kept_sections are values of a mapping, that maps names to |
372 | // them. This field is true if this struct is associated with the | |
373 | // name of a comdat or .gnu.linkonce, false if it is associated with | |
374 | // the name of a symbol obtained from the .gnu.linkonce.* name | |
375 | // through some heuristics. | |
1ef4d87f ILT |
376 | bool is_group_name_; |
377 | union | |
378 | { | |
379 | // If the is_comdat_ field is true, this holds a map from names of | |
380 | // the sections in the group to section indexes in object_ and to | |
381 | // section sizes. | |
382 | Comdat_group* group_sections; | |
383 | // If the is_comdat_ field is false, this holds the size of the | |
384 | // single section. | |
385 | uint64_t linkonce_size; | |
386 | } u_; | |
8a4c0b0d ILT |
387 | }; |
388 | ||
22f0da72 ILT |
389 | // The ordering for output sections. This controls how output |
390 | // sections are ordered within a PT_LOAD output segment. | |
391 | ||
392 | enum Output_section_order | |
393 | { | |
394 | // Unspecified. Used for non-load segments. Also used for the file | |
395 | // and segment headers. | |
396 | ORDER_INVALID, | |
397 | ||
398 | // The PT_INTERP section should come first, so that the dynamic | |
399 | // linker can pick it up quickly. | |
400 | ORDER_INTERP, | |
401 | ||
f85dcfc3 L |
402 | // The .note.gnu.property section comes next so that the PT_NOTE |
403 | // segment is on the first page of the executable and it won't be | |
404 | // placed between other note sections with different alignments. | |
405 | ORDER_PROPERTY_NOTE, | |
406 | ||
407 | // Loadable read-only note sections come after the .note.gnu.property | |
408 | // section. | |
22f0da72 ILT |
409 | ORDER_RO_NOTE, |
410 | ||
411 | // Put read-only sections used by the dynamic linker early in the | |
412 | // executable to minimize paging. | |
413 | ORDER_DYNAMIC_LINKER, | |
414 | ||
415 | // Put reloc sections used by the dynamic linker after other | |
416 | // sections used by the dynamic linker; otherwise, objcopy and strip | |
417 | // get confused. | |
418 | ORDER_DYNAMIC_RELOCS, | |
419 | ||
420 | // Put the PLT reloc section after the other dynamic relocs; | |
9a2743de | 421 | // otherwise, prelink gets confused. |
22f0da72 ILT |
422 | ORDER_DYNAMIC_PLT_RELOCS, |
423 | ||
424 | // The .init section. | |
425 | ORDER_INIT, | |
426 | ||
427 | // The PLT. | |
428 | ORDER_PLT, | |
429 | ||
779bdadb ST |
430 | // The hot text sections, prefixed by .text.hot. |
431 | ORDER_TEXT_HOT, | |
432 | ||
22f0da72 ILT |
433 | // The regular text sections. |
434 | ORDER_TEXT, | |
435 | ||
779bdadb ST |
436 | // The startup text sections, prefixed by .text.startup. |
437 | ORDER_TEXT_STARTUP, | |
438 | ||
439 | // The startup text sections, prefixed by .text.startup. | |
440 | ORDER_TEXT_EXIT, | |
441 | ||
442 | // The unlikely text sections, prefixed by .text.unlikely. | |
443 | ORDER_TEXT_UNLIKELY, | |
444 | ||
22f0da72 ILT |
445 | // The .fini section. |
446 | ORDER_FINI, | |
447 | ||
448 | // The read-only sections. | |
449 | ORDER_READONLY, | |
450 | ||
451 | // The exception frame sections. | |
452 | ORDER_EHFRAME, | |
453 | ||
454 | // The TLS sections come first in the data section. | |
455 | ORDER_TLS_DATA, | |
456 | ORDER_TLS_BSS, | |
457 | ||
458 | // Local RELRO (read-only after relocation) sections come before | |
459 | // non-local RELRO sections. This data will be fully resolved by | |
460 | // the prelinker. | |
461 | ORDER_RELRO_LOCAL, | |
462 | ||
463 | // Non-local RELRO sections are grouped together after local RELRO | |
464 | // sections. All RELRO sections must be adjacent so that they can | |
465 | // all be put into a PT_GNU_RELRO segment. | |
466 | ORDER_RELRO, | |
467 | ||
468 | // We permit marking exactly one output section as the last RELRO | |
469 | // section. We do this so that the read-only GOT can be adjacent to | |
470 | // the writable GOT. | |
471 | ORDER_RELRO_LAST, | |
472 | ||
473 | // Similarly, we permit marking exactly one output section as the | |
474 | // first non-RELRO section. | |
475 | ORDER_NON_RELRO_FIRST, | |
476 | ||
477 | // The regular data sections come after the RELRO sections. | |
478 | ORDER_DATA, | |
479 | ||
480 | // Large data sections normally go in large data segments. | |
481 | ORDER_LARGE_DATA, | |
482 | ||
483 | // Group writable notes so that we can have a single PT_NOTE | |
484 | // segment. | |
485 | ORDER_RW_NOTE, | |
486 | ||
487 | // The small data sections must be at the end of the data sections, | |
488 | // so that they can be adjacent to the small BSS sections. | |
489 | ORDER_SMALL_DATA, | |
490 | ||
491 | // The BSS sections start here. | |
492 | ||
493 | // The small BSS sections must be at the start of the BSS sections, | |
494 | // so that they can be adjacent to the small data sections. | |
495 | ORDER_SMALL_BSS, | |
496 | ||
497 | // The regular BSS sections. | |
498 | ORDER_BSS, | |
499 | ||
500 | // The large BSS sections come after the other BSS sections. | |
501 | ORDER_LARGE_BSS, | |
502 | ||
503 | // Maximum value. | |
504 | ORDER_MAX | |
505 | }; | |
506 | ||
a2fb1b05 ILT |
507 | // This class handles the details of laying out input sections. |
508 | ||
509 | class Layout | |
510 | { | |
511 | public: | |
e55bde5e | 512 | Layout(int number_of_input_files, Script_options*); |
54dc6425 | 513 | |
20e6d0d6 DK |
514 | ~Layout() |
515 | { | |
516 | delete this->relaxation_debug_check_; | |
517 | delete this->segment_states_; | |
518 | } | |
519 | ||
cdc29364 CC |
520 | // For incremental links, record the base file to be modified. |
521 | void | |
522 | set_incremental_base(Incremental_binary* base); | |
523 | ||
524 | Incremental_binary* | |
525 | incremental_base() | |
526 | { return this->incremental_base_; } | |
527 | ||
528 | // For incremental links, record the initial fixed layout of a section | |
529 | // from the base file, and return a pointer to the Output_section. | |
530 | template<int size, bool big_endian> | |
531 | Output_section* | |
532 | init_fixed_output_section(const char*, elfcpp::Shdr<size, big_endian>&); | |
533 | ||
ead1e424 ILT |
534 | // Given an input section SHNDX, named NAME, with data in SHDR, from |
535 | // the object file OBJECT, return the output section where this | |
730cdc88 ILT |
536 | // input section should go. RELOC_SHNDX is the index of a |
537 | // relocation section which applies to this section, or 0 if none, | |
538 | // or -1U if more than one. RELOC_TYPE is the type of the | |
539 | // relocation section if there is one. Set *OFFSET to the offset | |
540 | // within the output section. | |
a2fb1b05 ILT |
541 | template<int size, bool big_endian> |
542 | Output_section* | |
6fa2a40b | 543 | layout(Sized_relobj_file<size, big_endian> *object, unsigned int shndx, |
730cdc88 | 544 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
bce5a025 CC |
545 | unsigned int sh_type, unsigned int reloc_shndx, |
546 | unsigned int reloc_type, off_t* offset); | |
730cdc88 | 547 | |
f0558624 ST |
548 | std::map<Section_id, unsigned int>* |
549 | get_section_order_map() | |
550 | { return &this->section_order_map_; } | |
2e702c99 | 551 | |
16164a6b ST |
552 | // Struct to store segment info when mapping some input sections to |
553 | // unique segments using linker plugins. Mapping an input section to | |
554 | // a unique segment is done by first placing such input sections in | |
555 | // unique output sections and then mapping the output section to a | |
556 | // unique segment. NAME is the name of the output section. FLAGS | |
557 | // and ALIGN are the extra flags and alignment of the segment. | |
558 | struct Unique_segment_info | |
559 | { | |
5c3024d2 | 560 | // Identifier for the segment. ELF segments don't have names. This |
16164a6b ST |
561 | // is used as the name of the output section mapped to the segment. |
562 | const char* name; | |
563 | // Additional segment flags. | |
564 | uint64_t flags; | |
565 | // Segment alignment. | |
566 | uint64_t align; | |
567 | }; | |
568 | ||
569 | // Mapping from input section to segment. | |
570 | typedef std::map<Const_section_id, Unique_segment_info*> | |
571 | Section_segment_map; | |
572 | ||
573 | // Maps section SECN to SEGMENT s. | |
574 | void | |
575 | insert_section_segment_map(Const_section_id secn, Unique_segment_info *s); | |
28f2a4ac | 576 | |
edcac0c1 ILT |
577 | // Some input sections require special ordering, for compatibility |
578 | // with GNU ld. Given the name of an input section, return -1 if it | |
579 | // does not require special ordering. Otherwise, return the index | |
580 | // by which it should be ordered compared to other input sections | |
581 | // that require special ordering. | |
582 | static int | |
583 | special_ordering_of_input_section(const char* name); | |
584 | ||
e9552f7e ST |
585 | bool |
586 | is_section_ordering_specified() | |
587 | { return this->section_ordering_specified_; } | |
588 | ||
589 | void | |
590 | set_section_ordering_specified() | |
591 | { this->section_ordering_specified_ = true; } | |
592 | ||
16164a6b ST |
593 | bool |
594 | is_unique_segment_for_sections_specified() const | |
595 | { return this->unique_segment_for_sections_specified_; } | |
596 | ||
597 | void | |
598 | set_unique_segment_for_sections_specified() | |
599 | { this->unique_segment_for_sections_specified_ = true; } | |
600 | ||
cc5277b1 ML |
601 | bool |
602 | is_lto_slim_object () const | |
603 | { return this->lto_slim_object_; } | |
604 | ||
605 | void | |
606 | set_lto_slim_object () | |
607 | { this->lto_slim_object_ = true; } | |
608 | ||
cdc29364 CC |
609 | // For incremental updates, allocate a block of memory from the |
610 | // free list. Find a block starting at or after MINOFF. | |
611 | off_t | |
612 | allocate(off_t len, uint64_t align, off_t minoff) | |
613 | { return this->free_list_.allocate(len, align, minoff); } | |
614 | ||
6e9ba2ca ST |
615 | unsigned int |
616 | find_section_order_index(const std::string&); | |
617 | ||
e9552f7e ST |
618 | // Read the sequence of input sections from the file specified with |
619 | // linker option --section-ordering-file. | |
6e9ba2ca ST |
620 | void |
621 | read_layout_from_file(); | |
622 | ||
6a74a719 ILT |
623 | // Layout an input reloc section when doing a relocatable link. The |
624 | // section is RELOC_SHNDX in OBJECT, with data in SHDR. | |
625 | // DATA_SECTION is the reloc section to which it refers. RR is the | |
626 | // relocatable information. | |
627 | template<int size, bool big_endian> | |
628 | Output_section* | |
6fa2a40b | 629 | layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
630 | unsigned int reloc_shndx, |
631 | const elfcpp::Shdr<size, big_endian>& shdr, | |
632 | Output_section* data_section, | |
633 | Relocatable_relocs* rr); | |
634 | ||
635 | // Layout a group section when doing a relocatable link. | |
636 | template<int size, bool big_endian> | |
637 | void | |
638 | layout_group(Symbol_table* symtab, | |
6fa2a40b | 639 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
640 | unsigned int group_shndx, |
641 | const char* group_section_name, | |
642 | const char* signature, | |
643 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
644 | elfcpp::Elf_Word flags, |
645 | std::vector<unsigned int>* shndxes); | |
6a74a719 | 646 | |
730cdc88 ILT |
647 | // Like layout, only for exception frame sections. OBJECT is an |
648 | // object file. SYMBOLS is the contents of the symbol table | |
649 | // section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of | |
650 | // the symbol name section, with size SYMBOL_NAMES_SIZE. SHNDX is a | |
651 | // .eh_frame section in OBJECT. SHDR is the section header. | |
652 | // RELOC_SHNDX is the index of a relocation section which applies to | |
653 | // this section, or 0 if none, or -1U if more than one. RELOC_TYPE | |
654 | // is the type of the relocation section if there is one. This | |
655 | // returns the output section, and sets *OFFSET to the offset. | |
656 | template<int size, bool big_endian> | |
657 | Output_section* | |
6fa2a40b | 658 | layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
659 | const unsigned char* symbols, |
660 | off_t symbols_size, | |
661 | const unsigned char* symbol_names, | |
662 | off_t symbol_names_size, | |
663 | unsigned int shndx, | |
664 | const elfcpp::Shdr<size, big_endian>& shdr, | |
665 | unsigned int reloc_shndx, unsigned int reloc_type, | |
666 | off_t* offset); | |
a2fb1b05 | 667 | |
e1663197 CC |
668 | // After processing all input files, we call this to make sure that |
669 | // the optimized .eh_frame sections have been added to the output | |
670 | // section. | |
671 | void | |
672 | finalize_eh_frame_section(); | |
673 | ||
07a60597 ILT |
674 | // Add .eh_frame information for a PLT. The FDE must start with a |
675 | // 4-byte PC-relative reference to the start of the PLT, followed by | |
676 | // a 4-byte size of PLT. | |
677 | void | |
678 | add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
679 | size_t cie_length, const unsigned char* fde_data, | |
680 | size_t fde_length); | |
681 | ||
220f9906 | 682 | // Remove all post-map .eh_frame information for a PLT. |
be897fb7 AM |
683 | void |
684 | remove_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
220f9906 | 685 | size_t cie_length); |
be897fb7 | 686 | |
c1027032 CC |
687 | // Scan a .debug_info or .debug_types section, and add summary |
688 | // information to the .gdb_index section. | |
689 | template<int size, bool big_endian> | |
690 | void | |
691 | add_to_gdb_index(bool is_type_unit, | |
692 | Sized_relobj<size, big_endian>* object, | |
693 | const unsigned char* symbols, | |
694 | off_t symbols_size, | |
695 | unsigned int shndx, | |
696 | unsigned int reloc_shndx, | |
697 | unsigned int reloc_type); | |
698 | ||
35cdfc9a ILT |
699 | // Handle a GNU stack note. This is called once per input object |
700 | // file. SEEN_GNU_STACK is true if the object file has a | |
701 | // .note.GNU-stack section. GNU_STACK_FLAGS is the section flags | |
702 | // from that section if there was one. | |
703 | void | |
83e17bd5 CC |
704 | layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
705 | const Object*); | |
35cdfc9a | 706 | |
6c04fd9b CC |
707 | // Layout a .note.gnu.property section. |
708 | void | |
709 | layout_gnu_property(unsigned int note_type, | |
710 | unsigned int pr_type, | |
711 | size_t pr_datasz, | |
712 | const unsigned char* pr_data, | |
713 | const Object* object); | |
714 | ||
a2575bec CC |
715 | // Merge per-object properties with program properties. |
716 | void | |
717 | merge_gnu_properties(const Object* object); | |
718 | ||
719 | // Add a target-specific property for the output .note.gnu.property section. | |
720 | void | |
721 | add_gnu_property(unsigned int note_type, | |
722 | unsigned int pr_type, | |
723 | size_t pr_datasz, | |
724 | const unsigned char* pr_data); | |
725 | ||
ead1e424 | 726 | // Add an Output_section_data to the layout. This is used for |
22f0da72 ILT |
727 | // special sections like the GOT section. ORDER is where the |
728 | // section should wind up in the output segment. IS_RELRO is true | |
729 | // for relro sections. | |
9f1d377b | 730 | Output_section* |
ead1e424 ILT |
731 | add_output_section_data(const char* name, elfcpp::Elf_Word type, |
732 | elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
733 | Output_section_data*, Output_section_order order, |
734 | bool is_relro); | |
1a2dff53 ILT |
735 | |
736 | // Increase the size of the relro segment by this much. | |
737 | void | |
738 | increase_relro(unsigned int s) | |
739 | { this->increase_relro_ += s; } | |
ead1e424 | 740 | |
a3ad94ed ILT |
741 | // Create dynamic sections if necessary. |
742 | void | |
9b07f471 | 743 | create_initial_dynamic_sections(Symbol_table*); |
a3ad94ed | 744 | |
bfd58944 ILT |
745 | // Define __start and __stop symbols for output sections. |
746 | void | |
9b07f471 | 747 | define_section_symbols(Symbol_table*); |
bfd58944 | 748 | |
9c547ec3 ILT |
749 | // Create automatic note sections. |
750 | void | |
751 | create_notes(); | |
752 | ||
919ed24c ILT |
753 | // Create sections for linker scripts. |
754 | void | |
755 | create_script_sections() | |
756 | { this->script_options_->create_script_sections(this); } | |
757 | ||
e5756efb ILT |
758 | // Define symbols from any linker script. |
759 | void | |
9b07f471 ILT |
760 | define_script_symbols(Symbol_table* symtab) |
761 | { this->script_options_->add_symbols_to_table(symtab); } | |
e5756efb | 762 | |
755ab8af ILT |
763 | // Define symbols for group signatures. |
764 | void | |
765 | define_group_signatures(Symbol_table*); | |
766 | ||
61ba1cf9 ILT |
767 | // Return the Stringpool used for symbol names. |
768 | const Stringpool* | |
769 | sympool() const | |
770 | { return &this->sympool_; } | |
771 | ||
16649710 ILT |
772 | // Return the Stringpool used for dynamic symbol names and dynamic |
773 | // tags. | |
774 | const Stringpool* | |
775 | dynpool() const | |
776 | { return &this->dynpool_; } | |
777 | ||
7d172687 ILT |
778 | // Return the .dynamic output section. This is only valid after the |
779 | // layout has been finalized. | |
780 | Output_section* | |
781 | dynamic_section() const | |
782 | { return this->dynamic_section_; } | |
783 | ||
d491d34e ILT |
784 | // Return the symtab_xindex section used to hold large section |
785 | // indexes for the normal symbol table. | |
786 | Output_symtab_xindex* | |
787 | symtab_xindex() const | |
788 | { return this->symtab_xindex_; } | |
789 | ||
790 | // Return the dynsym_xindex section used to hold large section | |
791 | // indexes for the dynamic symbol table. | |
792 | Output_symtab_xindex* | |
793 | dynsym_xindex() const | |
794 | { return this->dynsym_xindex_; } | |
795 | ||
a2fb1b05 ILT |
796 | // Return whether a section is a .gnu.linkonce section, given the |
797 | // section name. | |
798 | static inline bool | |
799 | is_linkonce(const char* name) | |
800 | { return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; } | |
801 | ||
d7bb5745 ILT |
802 | // Whether we have added an input section. |
803 | bool | |
804 | have_added_input_section() const | |
805 | { return this->have_added_input_section_; } | |
806 | ||
e94cf127 CC |
807 | // Return true if a section is a debugging section. |
808 | static inline bool | |
809 | is_debug_info_section(const char* name) | |
810 | { | |
811 | // Debugging sections can only be recognized by name. | |
812 | return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0 | |
2e702c99 RM |
813 | || strncmp(name, ".zdebug", sizeof(".zdebug") - 1) == 0 |
814 | || strncmp(name, ".gnu.linkonce.wi.", | |
815 | sizeof(".gnu.linkonce.wi.") - 1) == 0 | |
816 | || strncmp(name, ".line", sizeof(".line") - 1) == 0 | |
cc203475 VR |
817 | || strncmp(name, ".stab", sizeof(".stab") - 1) == 0 |
818 | || strncmp(name, ".pdr", sizeof(".pdr") - 1) == 0); | |
e94cf127 CC |
819 | } |
820 | ||
5393d741 ILT |
821 | // Return true if RELOBJ is an input file whose base name matches |
822 | // FILE_NAME. The base name must have an extension of ".o", and | |
823 | // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o". | |
824 | static bool | |
825 | match_file_name(const Relobj* relobj, const char* file_name); | |
826 | ||
487b39df ILT |
827 | // Return whether section SHNDX in RELOBJ is a .ctors/.dtors section |
828 | // with more than one word being mapped to a .init_array/.fini_array | |
829 | // section. | |
830 | bool | |
831 | is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const; | |
832 | ||
8a4c0b0d ILT |
833 | // Check if a comdat group or .gnu.linkonce section with the given |
834 | // NAME is selected for the link. If there is already a section, | |
835 | // *KEPT_SECTION is set to point to the signature and the function | |
1ef4d87f ILT |
836 | // returns false. Otherwise, OBJECT, SHNDX,IS_COMDAT, and |
837 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
838 | // *KEPT_SECTION is set to the internal copy and the function return | |
839 | // false. | |
a2fb1b05 | 840 | bool |
2e702c99 | 841 | find_or_add_kept_section(const std::string& name, Relobj* object, |
1ef4d87f ILT |
842 | unsigned int shndx, bool is_comdat, |
843 | bool is_group_name, Kept_section** kept_section); | |
a2fb1b05 | 844 | |
54dc6425 | 845 | // Finalize the layout after all the input sections have been added. |
75f65a3e | 846 | off_t |
8851ecca | 847 | finalize(const Input_objects*, Symbol_table*, Target*, const Task*); |
17a1d0a9 ILT |
848 | |
849 | // Return whether any sections require postprocessing. | |
850 | bool | |
851 | any_postprocessing_sections() const | |
852 | { return this->any_postprocessing_sections_; } | |
54dc6425 | 853 | |
e44fcf3b ILT |
854 | // Return the size of the output file. |
855 | off_t | |
856 | output_file_size() const | |
857 | { return this->output_file_size_; } | |
858 | ||
16649710 ILT |
859 | // Return the TLS segment. This will return NULL if there isn't |
860 | // one. | |
92e059d8 ILT |
861 | Output_segment* |
862 | tls_segment() const | |
863 | { return this->tls_segment_; } | |
864 | ||
16649710 ILT |
865 | // Return the normal symbol table. |
866 | Output_section* | |
867 | symtab_section() const | |
868 | { | |
869 | gold_assert(this->symtab_section_ != NULL); | |
870 | return this->symtab_section_; | |
871 | } | |
872 | ||
bec5b579 CC |
873 | // Return the file offset of the normal symbol table. |
874 | off_t | |
875 | symtab_section_offset() const; | |
876 | ||
886f533a ILT |
877 | // Return the section index of the normal symbol tabl.e |
878 | unsigned int | |
879 | symtab_section_shndx() const; | |
880 | ||
16649710 ILT |
881 | // Return the dynamic symbol table. |
882 | Output_section* | |
883 | dynsym_section() const | |
884 | { | |
885 | gold_assert(this->dynsym_section_ != NULL); | |
886 | return this->dynsym_section_; | |
887 | } | |
888 | ||
889 | // Return the dynamic tags. | |
890 | Output_data_dynamic* | |
891 | dynamic_data() const | |
892 | { return this->dynamic_data_; } | |
893 | ||
730cdc88 ILT |
894 | // Write out the output sections. |
895 | void | |
896 | write_output_sections(Output_file* of) const; | |
897 | ||
61ba1cf9 ILT |
898 | // Write out data not associated with an input file or the symbol |
899 | // table. | |
900 | void | |
9025d29d | 901 | write_data(const Symbol_table*, Output_file*) const; |
61ba1cf9 | 902 | |
730cdc88 ILT |
903 | // Write out output sections which can not be written until all the |
904 | // input sections are complete. | |
905 | void | |
27bc2bce | 906 | write_sections_after_input_sections(Output_file* of); |
730cdc88 | 907 | |
ead1e424 ILT |
908 | // Return an output section named NAME, or NULL if there is none. |
909 | Output_section* | |
910 | find_output_section(const char* name) const; | |
911 | ||
912 | // Return an output segment of type TYPE, with segment flags SET set | |
913 | // and segment flags CLEAR clear. Return NULL if there is none. | |
914 | Output_segment* | |
915 | find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
916 | elfcpp::Elf_Word clear) const; | |
917 | ||
3802b2dd ILT |
918 | // Return the number of segments we expect to produce. |
919 | size_t | |
920 | expected_segment_count() const; | |
921 | ||
535890bb ILT |
922 | // Set a flag to indicate that an object file uses the static TLS model. |
923 | void | |
924 | set_has_static_tls() | |
925 | { this->has_static_tls_ = true; } | |
926 | ||
927 | // Return true if any object file uses the static TLS model. | |
928 | bool | |
929 | has_static_tls() const | |
930 | { return this->has_static_tls_; } | |
931 | ||
e5756efb ILT |
932 | // Return the options which may be set by a linker script. |
933 | Script_options* | |
934 | script_options() | |
935 | { return this->script_options_; } | |
936 | ||
937 | const Script_options* | |
938 | script_options() const | |
939 | { return this->script_options_; } | |
d391083d | 940 | |
3ce2c28e ILT |
941 | // Return the object managing inputs in incremental build. NULL in |
942 | // non-incremental builds. | |
943 | Incremental_inputs* | |
09ec0418 | 944 | incremental_inputs() const |
3ce2c28e ILT |
945 | { return this->incremental_inputs_; } |
946 | ||
ea715a34 ILT |
947 | // For the target-specific code to add dynamic tags which are common |
948 | // to most targets. | |
949 | void | |
950 | add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
951 | const Output_data* plt_rel, | |
3a44184e | 952 | const Output_data_reloc_generic* dyn_rel, |
bdad2ad5 AM |
953 | bool add_debug, bool dynrel_includes_plt, |
954 | bool custom_relcount); | |
ea715a34 | 955 | |
dc1c8a16 CC |
956 | // Add a target-specific dynamic tag with constant value. |
957 | void | |
958 | add_target_specific_dynamic_tag(elfcpp::DT tag, unsigned int val); | |
959 | ||
8ed814a9 ILT |
960 | // Compute and write out the build ID if needed. |
961 | void | |
9c7fe3c5 | 962 | write_build_id(Output_file*, unsigned char*, size_t) const; |
8ed814a9 | 963 | |
516cb3d0 ILT |
964 | // Rewrite output file in binary format. |
965 | void | |
966 | write_binary(Output_file* in) const; | |
967 | ||
7d9e3d98 ILT |
968 | // Print output sections to the map file. |
969 | void | |
970 | print_to_mapfile(Mapfile*) const; | |
971 | ||
ad8f37d1 ILT |
972 | // Dump statistical information to stderr. |
973 | void | |
974 | print_stats() const; | |
975 | ||
a445fddf | 976 | // A list of segments. |
54dc6425 ILT |
977 | |
978 | typedef std::vector<Output_segment*> Segment_list; | |
979 | ||
a445fddf | 980 | // A list of sections. |
54dc6425 | 981 | |
a3ad94ed | 982 | typedef std::vector<Output_section*> Section_list; |
54dc6425 ILT |
983 | |
984 | // The list of information to write out which is not attached to | |
985 | // either a section or a segment. | |
a3ad94ed | 986 | typedef std::vector<Output_data*> Data_list; |
54dc6425 | 987 | |
a445fddf ILT |
988 | // Store the allocated sections into the section list. This is used |
989 | // by the linker script code. | |
990 | void | |
991 | get_allocated_sections(Section_list*) const; | |
992 | ||
ec661b9d AM |
993 | // Store the executable sections into the section list. |
994 | void | |
995 | get_executable_sections(Section_list*) const; | |
996 | ||
919ed24c ILT |
997 | // Make a section for a linker script to hold data. |
998 | Output_section* | |
1e5d2fb1 DK |
999 | make_output_section_for_script(const char* name, |
1000 | Script_sections::Section_type section_type); | |
919ed24c | 1001 | |
a445fddf ILT |
1002 | // Make a segment. This is used by the linker script code. |
1003 | Output_segment* | |
1004 | make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags); | |
1005 | ||
1006 | // Return the number of segments. | |
1007 | size_t | |
1008 | segment_count() const | |
1009 | { return this->segment_list_.size(); } | |
1010 | ||
1011 | // Map from section flags to segment flags. | |
1012 | static elfcpp::Elf_Word | |
1013 | section_flags_to_segment(elfcpp::Elf_Xword flags); | |
1014 | ||
154e0e9a ILT |
1015 | // Attach sections to segments. |
1016 | void | |
2e702c99 | 1017 | attach_sections_to_segments(const Target*); |
154e0e9a | 1018 | |
20e6d0d6 DK |
1019 | // For relaxation clean up, we need to know output section data created |
1020 | // from a linker script. | |
1021 | void | |
1022 | new_output_section_data_from_script(Output_section_data* posd) | |
1023 | { | |
1024 | if (this->record_output_section_data_from_script_) | |
1025 | this->script_output_section_data_list_.push_back(posd); | |
1026 | } | |
1027 | ||
c0a62865 DK |
1028 | // Return section list. |
1029 | const Section_list& | |
1030 | section_list() const | |
1031 | { return this->section_list_; } | |
1032 | ||
b9b2ae8b NC |
1033 | // Returns TRUE iff NAME (an input section from RELOBJ) will |
1034 | // be mapped to an output section that should be KEPT. | |
1035 | bool | |
1036 | keep_input_section(const Relobj*, const char*); | |
eb426534 RM |
1037 | |
1038 | // Add a special output object that will be recreated afresh | |
1039 | // if there is another relaxation iteration. | |
1040 | void | |
1041 | add_relax_output(Output_data* data) | |
1042 | { this->relax_output_list_.push_back(data); } | |
1043 | ||
1044 | // Clear out (and free) everything added by add_relax_output. | |
1045 | void | |
1046 | reset_relax_output(); | |
1047 | ||
a2fb1b05 ILT |
1048 | private: |
1049 | Layout(const Layout&); | |
1050 | Layout& operator=(const Layout&); | |
1051 | ||
dff16297 ILT |
1052 | // Mapping from input section names to output section names. |
1053 | struct Section_name_mapping | |
a2fb1b05 ILT |
1054 | { |
1055 | const char* from; | |
1056 | int fromlen; | |
1057 | const char* to; | |
ead1e424 | 1058 | int tolen; |
a2fb1b05 | 1059 | }; |
dff16297 ILT |
1060 | static const Section_name_mapping section_name_mapping[]; |
1061 | static const int section_name_mapping_count; | |
779bdadb ST |
1062 | static const Section_name_mapping text_section_name_mapping[]; |
1063 | static const int text_section_name_mapping_count; | |
1064 | ||
1065 | // Find section name NAME in map and return the mapped name if found | |
1066 | // with the length set in PLEN. | |
1067 | static const char* match_section_name(const Section_name_mapping* map, | |
1068 | const int count, const char* name, | |
1069 | size_t* plen); | |
a2fb1b05 | 1070 | |
755ab8af ILT |
1071 | // During a relocatable link, a list of group sections and |
1072 | // signatures. | |
1073 | struct Group_signature | |
1074 | { | |
1075 | // The group section. | |
1076 | Output_section* section; | |
1077 | // The signature. | |
1078 | const char* signature; | |
1079 | ||
1080 | Group_signature() | |
1081 | : section(NULL), signature(NULL) | |
1082 | { } | |
1083 | ||
1084 | Group_signature(Output_section* sectiona, const char* signaturea) | |
1085 | : section(sectiona), signature(signaturea) | |
1086 | { } | |
1087 | }; | |
1088 | typedef std::vector<Group_signature> Group_signatures; | |
1089 | ||
ef4ab7a8 | 1090 | // Create a note section, filling in the header. |
8ed814a9 | 1091 | Output_section* |
ca09d69a | 1092 | create_note(const char* name, int note_type, const char* section_name, |
ef4ab7a8 | 1093 | size_t descsz, bool allocate, size_t* trailing_padding); |
8ed814a9 | 1094 | |
6c04fd9b CC |
1095 | // Create a note section for gnu program properties. |
1096 | void | |
1097 | create_gnu_properties_note(); | |
1098 | ||
ef4ab7a8 | 1099 | // Create a note section for gold version. |
4f211c8b | 1100 | void |
35cdfc9a ILT |
1101 | create_gold_note(); |
1102 | ||
1130c90e | 1103 | // Record whether the stack must be executable, and a user-supplied size. |
35cdfc9a | 1104 | void |
1130c90e | 1105 | create_stack_segment(); |
4f211c8b | 1106 | |
8ed814a9 ILT |
1107 | // Create a build ID note if needed. |
1108 | void | |
1109 | create_build_id(); | |
1110 | ||
70182115 LB |
1111 | // Create a package metadata note if needed. |
1112 | void | |
1113 | create_package_metadata(); | |
1114 | ||
1518dc8f ILT |
1115 | // Link .stab and .stabstr sections. |
1116 | void | |
1117 | link_stabs_sections(); | |
1118 | ||
3ce2c28e ILT |
1119 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
1120 | // for the next run of incremental linking to check what has changed. | |
1121 | void | |
09ec0418 | 1122 | create_incremental_info_sections(Symbol_table*); |
3ce2c28e | 1123 | |
75f65a3e ILT |
1124 | // Find the first read-only PT_LOAD segment, creating one if |
1125 | // necessary. | |
1126 | Output_segment* | |
2e702c99 | 1127 | find_first_load_seg(const Target*); |
75f65a3e | 1128 | |
7bf1f802 ILT |
1129 | // Count the local symbols in the regular symbol table and the dynamic |
1130 | // symbol table, and build the respective string pools. | |
1131 | void | |
17a1d0a9 | 1132 | count_local_symbols(const Task*, const Input_objects*); |
7bf1f802 | 1133 | |
54dc6425 ILT |
1134 | // Create the output sections for the symbol table. |
1135 | void | |
d491d34e | 1136 | create_symtab_sections(const Input_objects*, Symbol_table*, |
c4d5a762 | 1137 | unsigned int, off_t*, unsigned int); |
54dc6425 | 1138 | |
75f65a3e ILT |
1139 | // Create the .shstrtab section. |
1140 | Output_section* | |
1141 | create_shstrtab(); | |
1142 | ||
1143 | // Create the section header table. | |
27bc2bce | 1144 | void |
d491d34e | 1145 | create_shdrs(const Output_section* shstrtab_section, off_t*); |
54dc6425 | 1146 | |
dbe717ef ILT |
1147 | // Create the dynamic symbol table. |
1148 | void | |
9b07f471 ILT |
1149 | create_dynamic_symtab(const Input_objects*, Symbol_table*, |
1150 | Output_section** pdynstr, | |
14b31740 | 1151 | unsigned int* plocal_dynamic_count, |
c4d5a762 | 1152 | unsigned int* pforced_local_dynamic_count, |
14b31740 ILT |
1153 | std::vector<Symbol*>* pdynamic_symbols, |
1154 | Versions* versions); | |
dbe717ef | 1155 | |
7bf1f802 ILT |
1156 | // Assign offsets to each local portion of the dynamic symbol table. |
1157 | void | |
1158 | assign_local_dynsym_offsets(const Input_objects*); | |
1159 | ||
a3ad94ed | 1160 | // Finish the .dynamic section and PT_DYNAMIC segment. |
dbe717ef | 1161 | void |
16649710 | 1162 | finish_dynamic_section(const Input_objects*, const Symbol_table*); |
dbe717ef | 1163 | |
f0ba79e2 ILT |
1164 | // Set the size of the _DYNAMIC symbol. |
1165 | void | |
1166 | set_dynamic_symbol_size(const Symbol_table*); | |
1167 | ||
dbe717ef ILT |
1168 | // Create the .interp section and PT_INTERP segment. |
1169 | void | |
1170 | create_interp(const Target* target); | |
1171 | ||
14b31740 ILT |
1172 | // Create the version sections. |
1173 | void | |
9025d29d | 1174 | create_version_sections(const Versions*, |
46fe1623 | 1175 | const Symbol_table*, |
14b31740 ILT |
1176 | unsigned int local_symcount, |
1177 | const std::vector<Symbol*>& dynamic_symbols, | |
1178 | const Output_section* dynstr); | |
1179 | ||
1180 | template<int size, bool big_endian> | |
1181 | void | |
1182 | sized_create_version_sections(const Versions* versions, | |
46fe1623 | 1183 | const Symbol_table*, |
14b31740 ILT |
1184 | unsigned int local_symcount, |
1185 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 1186 | const Output_section* dynstr); |
14b31740 | 1187 | |
a2fb1b05 ILT |
1188 | // Return whether to include this section in the link. |
1189 | template<int size, bool big_endian> | |
1190 | bool | |
6fa2a40b | 1191 | include_section(Sized_relobj_file<size, big_endian>* object, const char* name, |
a2fb1b05 ILT |
1192 | const elfcpp::Shdr<size, big_endian>&); |
1193 | ||
ead1e424 ILT |
1194 | // Return the output section name to use given an input section |
1195 | // name. Set *PLEN to the length of the name. *PLEN must be | |
1196 | // initialized to the length of NAME. | |
1197 | static const char* | |
5393d741 | 1198 | output_section_name(const Relobj*, const char* name, size_t* plen); |
ead1e424 | 1199 | |
d491d34e ILT |
1200 | // Return the number of allocated output sections. |
1201 | size_t | |
1202 | allocated_output_section_count() const; | |
1203 | ||
ead1e424 ILT |
1204 | // Return the output section for NAME, TYPE and FLAGS. |
1205 | Output_section* | |
f0641a0b | 1206 | get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 1207 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 1208 | Output_section_order order, bool is_relro); |
a2fb1b05 | 1209 | |
16164a6b ST |
1210 | // Clear the input section flags that should not be copied to the |
1211 | // output section. | |
1212 | elfcpp::Elf_Xword | |
1213 | get_output_section_flags (elfcpp::Elf_Xword input_section_flags); | |
1214 | ||
a445fddf ILT |
1215 | // Choose the output section for NAME in RELOBJ. |
1216 | Output_section* | |
1217 | choose_output_section(const Relobj* relobj, const char* name, | |
1218 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 | 1219 | bool is_input_section, Output_section_order order, |
412ffd83 | 1220 | bool is_relro, bool is_reloc, bool match_input_spec); |
a445fddf | 1221 | |
a2fb1b05 ILT |
1222 | // Create a new Output_section. |
1223 | Output_section* | |
1224 | make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1225 | elfcpp::Elf_Xword flags, Output_section_order order, |
1226 | bool is_relro); | |
a2fb1b05 | 1227 | |
4e2b1697 ILT |
1228 | // Attach a section to a segment. |
1229 | void | |
2e702c99 | 1230 | attach_section_to_segment(const Target*, Output_section*); |
4e2b1697 | 1231 | |
22f0da72 ILT |
1232 | // Get section order. |
1233 | Output_section_order | |
1234 | default_section_order(Output_section*, bool is_relro_local); | |
1235 | ||
154e0e9a | 1236 | // Attach an allocated section to a segment. |
1650c4ff | 1237 | void |
2e702c99 | 1238 | attach_allocated_section_to_segment(const Target*, Output_section*); |
1650c4ff | 1239 | |
07a60597 ILT |
1240 | // Make the .eh_frame section. |
1241 | Output_section* | |
1242 | make_eh_frame_section(const Relobj*); | |
1243 | ||
dbe717ef ILT |
1244 | // Set the final file offsets of all the segments. |
1245 | off_t | |
1246 | set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx); | |
1247 | ||
6a74a719 ILT |
1248 | // Set the file offsets of the sections when doing a relocatable |
1249 | // link. | |
1250 | off_t | |
1251 | set_relocatable_section_offsets(Output_data*, unsigned int* pshndx); | |
1252 | ||
86887060 | 1253 | // Set the final file offsets of all the sections not associated |
9a0910c3 ILT |
1254 | // with a segment. We set section offsets in three passes: the |
1255 | // first handles all allocated sections, the second sections that | |
17a1d0a9 ILT |
1256 | // require postprocessing, and the last the late-bound STRTAB |
1257 | // sections (probably only shstrtab, which is the one we care about | |
1258 | // because it holds section names). | |
9a0910c3 ILT |
1259 | enum Section_offset_pass |
1260 | { | |
1261 | BEFORE_INPUT_SECTIONS_PASS, | |
17a1d0a9 ILT |
1262 | POSTPROCESSING_SECTIONS_PASS, |
1263 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS | |
9a0910c3 | 1264 | }; |
dbe717ef | 1265 | off_t |
9a0910c3 ILT |
1266 | set_section_offsets(off_t, Section_offset_pass pass); |
1267 | ||
86887060 ILT |
1268 | // Set the final section indexes of all the sections not associated |
1269 | // with a segment. Returns the next unused index. | |
1270 | unsigned int | |
1271 | set_section_indexes(unsigned int pshndx); | |
dbe717ef | 1272 | |
a445fddf ILT |
1273 | // Set the section addresses when using a script. |
1274 | Output_segment* | |
1275 | set_section_addresses_from_script(Symbol_table*); | |
1276 | ||
20e6d0d6 DK |
1277 | // Find appropriate places or orphan sections in a script. |
1278 | void | |
1279 | place_orphan_sections_in_script(); | |
1280 | ||
a2fb1b05 | 1281 | // Return whether SEG1 comes before SEG2 in the output file. |
aecf301f | 1282 | bool |
b3168e9d | 1283 | segment_precedes(const Output_segment* seg1, const Output_segment* seg2); |
a2fb1b05 | 1284 | |
2e702c99 | 1285 | // Use to save and restore segments during relaxation. |
20e6d0d6 DK |
1286 | typedef Unordered_map<const Output_segment*, const Output_segment*> |
1287 | Segment_states; | |
1288 | ||
1289 | // Save states of current output segments. | |
1290 | void | |
1291 | save_segments(Segment_states*); | |
1292 | ||
1293 | // Restore output segment states. | |
1294 | void | |
1295 | restore_segments(const Segment_states*); | |
1296 | ||
1297 | // Clean up after relaxation so that it is possible to lay out the | |
1298 | // sections and segments again. | |
1299 | void | |
1300 | clean_up_after_relaxation(); | |
1301 | ||
1302 | // Doing preparation work for relaxation. This is factored out to make | |
1303 | // Layout::finalized a bit smaller and easier to read. | |
1304 | void | |
1305 | prepare_for_relaxation(); | |
1306 | ||
1307 | // Main body of the relaxation loop, which lays out the section. | |
1308 | off_t | |
1309 | relaxation_loop_body(int, Target*, Symbol_table*, Output_segment**, | |
1310 | Output_segment*, Output_segment_headers*, | |
1311 | Output_file_header*, unsigned int*); | |
1312 | ||
8a4c0b0d | 1313 | // A mapping used for kept comdats/.gnu.linkonce group signatures. |
e94cf127 | 1314 | typedef Unordered_map<std::string, Kept_section> Signatures; |
a2fb1b05 ILT |
1315 | |
1316 | // Mapping from input section name/type/flags to output section. We | |
1317 | // use canonicalized strings here. | |
1318 | ||
f0641a0b | 1319 | typedef std::pair<Stringpool::Key, |
a2fb1b05 ILT |
1320 | std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key; |
1321 | ||
1322 | struct Hash_key | |
1323 | { | |
1324 | size_t | |
1325 | operator()(const Key& k) const; | |
1326 | }; | |
1327 | ||
1328 | typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map; | |
1329 | ||
1330 | // A comparison class for segments. | |
1331 | ||
aecf301f | 1332 | class Compare_segments |
a2fb1b05 | 1333 | { |
aecf301f ILT |
1334 | public: |
1335 | Compare_segments(Layout* layout) | |
1336 | : layout_(layout) | |
1337 | { } | |
1338 | ||
a2fb1b05 ILT |
1339 | bool |
1340 | operator()(const Output_segment* seg1, const Output_segment* seg2) | |
aecf301f ILT |
1341 | { return this->layout_->segment_precedes(seg1, seg2); } |
1342 | ||
1343 | private: | |
1344 | Layout* layout_; | |
a2fb1b05 ILT |
1345 | }; |
1346 | ||
20e6d0d6 DK |
1347 | typedef std::vector<Output_section_data*> Output_section_data_list; |
1348 | ||
1349 | // Debug checker class. | |
1350 | class Relaxation_debug_check | |
1351 | { | |
1352 | public: | |
1353 | Relaxation_debug_check() | |
1354 | : section_infos_() | |
1355 | { } | |
2e702c99 | 1356 | |
20e6d0d6 DK |
1357 | // Check that sections and special data are in reset states. |
1358 | void | |
1359 | check_output_data_for_reset_values(const Layout::Section_list&, | |
eb426534 RM |
1360 | const Layout::Data_list& special_outputs, |
1361 | const Layout::Data_list& relax_outputs); | |
2e702c99 | 1362 | |
20e6d0d6 DK |
1363 | // Record information of a section list. |
1364 | void | |
1365 | read_sections(const Layout::Section_list&); | |
1366 | ||
1367 | // Verify a section list with recorded information. | |
1368 | void | |
1369 | verify_sections(const Layout::Section_list&); | |
2e702c99 | 1370 | |
20e6d0d6 DK |
1371 | private: |
1372 | // Information we care about a section. | |
1373 | struct Section_info | |
1374 | { | |
1375 | // Output section described by this. | |
1376 | Output_section* output_section; | |
1377 | // Load address. | |
1378 | uint64_t address; | |
1379 | // Data size. | |
1380 | off_t data_size; | |
1381 | // File offset. | |
1382 | off_t offset; | |
1383 | }; | |
1384 | ||
1385 | // Section information. | |
1386 | std::vector<Section_info> section_infos_; | |
1387 | }; | |
1388 | ||
a2575bec | 1389 | // Program properties from .note.gnu.property sections. |
6c04fd9b CC |
1390 | struct Gnu_property |
1391 | { | |
1392 | size_t pr_datasz; | |
1393 | unsigned char* pr_data; | |
1394 | }; | |
1395 | typedef std::map<unsigned int, Gnu_property> Gnu_properties; | |
1396 | ||
e55bde5e ILT |
1397 | // The number of input files, for sizing tables. |
1398 | int number_of_input_files_; | |
e5756efb ILT |
1399 | // Information set by scripts or by command line options. |
1400 | Script_options* script_options_; | |
a2fb1b05 ILT |
1401 | // The output section names. |
1402 | Stringpool namepool_; | |
75f65a3e ILT |
1403 | // The output symbol names. |
1404 | Stringpool sympool_; | |
a3ad94ed ILT |
1405 | // The dynamic strings, if needed. |
1406 | Stringpool dynpool_; | |
a2fb1b05 ILT |
1407 | // The list of group sections and linkonce sections which we have seen. |
1408 | Signatures signatures_; | |
1409 | // The mapping from input section name/type/flags to output sections. | |
1410 | Section_name_map section_name_map_; | |
1411 | // The list of output segments. | |
1412 | Segment_list segment_list_; | |
a3ad94ed ILT |
1413 | // The list of output sections. |
1414 | Section_list section_list_; | |
a2fb1b05 ILT |
1415 | // The list of output sections which are not attached to any output |
1416 | // segment. | |
a3ad94ed ILT |
1417 | Section_list unattached_section_list_; |
1418 | // The list of unattached Output_data objects which require special | |
1419 | // handling because they are not Output_sections. | |
61ba1cf9 | 1420 | Data_list special_output_list_; |
eb426534 RM |
1421 | // Like special_output_list_, but cleared and recreated on each |
1422 | // iteration of relaxation. | |
1423 | Data_list relax_output_list_; | |
27bc2bce ILT |
1424 | // The section headers. |
1425 | Output_section_headers* section_headers_; | |
92e059d8 ILT |
1426 | // A pointer to the PT_TLS segment if there is one. |
1427 | Output_segment* tls_segment_; | |
9f1d377b ILT |
1428 | // A pointer to the PT_GNU_RELRO segment if there is one. |
1429 | Output_segment* relro_segment_; | |
10b4f102 ILT |
1430 | // A pointer to the PT_INTERP segment if there is one. |
1431 | Output_segment* interp_segment_; | |
1a2dff53 ILT |
1432 | // A backend may increase the size of the PT_GNU_RELRO segment if |
1433 | // there is one. This is the amount to increase it by. | |
1434 | unsigned int increase_relro_; | |
a3ad94ed ILT |
1435 | // The SHT_SYMTAB output section. |
1436 | Output_section* symtab_section_; | |
d491d34e ILT |
1437 | // The SHT_SYMTAB_SHNDX for the regular symbol table if there is one. |
1438 | Output_symtab_xindex* symtab_xindex_; | |
a3ad94ed ILT |
1439 | // The SHT_DYNSYM output section if there is one. |
1440 | Output_section* dynsym_section_; | |
d491d34e ILT |
1441 | // The SHT_SYMTAB_SHNDX for the dynamic symbol table if there is one. |
1442 | Output_symtab_xindex* dynsym_xindex_; | |
a3ad94ed ILT |
1443 | // The SHT_DYNAMIC output section if there is one. |
1444 | Output_section* dynamic_section_; | |
f0ba79e2 ILT |
1445 | // The _DYNAMIC symbol if there is one. |
1446 | Symbol* dynamic_symbol_; | |
16649710 ILT |
1447 | // The dynamic data which goes into dynamic_section_. |
1448 | Output_data_dynamic* dynamic_data_; | |
730cdc88 | 1449 | // The exception frame output section if there is one. |
3151305a | 1450 | Output_section* eh_frame_section_; |
730cdc88 ILT |
1451 | // The exception frame data for eh_frame_section_. |
1452 | Eh_frame* eh_frame_data_; | |
2c38906f ILT |
1453 | // Whether we have added eh_frame_data_ to the .eh_frame section. |
1454 | bool added_eh_frame_data_; | |
730cdc88 ILT |
1455 | // The exception frame header output section if there is one. |
1456 | Output_section* eh_frame_hdr_section_; | |
c1027032 CC |
1457 | // The data for the .gdb_index section. |
1458 | Gdb_index* gdb_index_data_; | |
8ed814a9 ILT |
1459 | // The space for the build ID checksum if there is one. |
1460 | Output_section_data* build_id_note_; | |
70182115 LB |
1461 | // The space for the package metadata JSON if there is one. |
1462 | Output_section_data* package_metadata_note_; | |
62b01cb5 ILT |
1463 | // The output section containing dwarf abbreviations |
1464 | Output_reduced_debug_abbrev_section* debug_abbrev_; | |
1465 | // The output section containing the dwarf debug info tree | |
1466 | Output_reduced_debug_info_section* debug_info_; | |
755ab8af ILT |
1467 | // A list of group sections and their signatures. |
1468 | Group_signatures group_signatures_; | |
e44fcf3b ILT |
1469 | // The size of the output file. |
1470 | off_t output_file_size_; | |
d7bb5745 ILT |
1471 | // Whether we have added an input section to an output section. |
1472 | bool have_added_input_section_; | |
e55bde5e ILT |
1473 | // Whether we have attached the sections to the segments. |
1474 | bool sections_are_attached_; | |
35cdfc9a ILT |
1475 | // Whether we have seen an object file marked to require an |
1476 | // executable stack. | |
1477 | bool input_requires_executable_stack_; | |
1478 | // Whether we have seen at least one object file with an executable | |
1479 | // stack marker. | |
1480 | bool input_with_gnu_stack_note_; | |
1481 | // Whether we have seen at least one object file without an | |
1482 | // executable stack marker. | |
1483 | bool input_without_gnu_stack_note_; | |
535890bb ILT |
1484 | // Whether we have seen an object file that uses the static TLS model. |
1485 | bool has_static_tls_; | |
17a1d0a9 ILT |
1486 | // Whether any sections require postprocessing. |
1487 | bool any_postprocessing_sections_; | |
e55bde5e ILT |
1488 | // Whether we have resized the signatures_ hash table. |
1489 | bool resized_signatures_; | |
1518dc8f ILT |
1490 | // Whether we have created a .stab*str output section. |
1491 | bool have_stabstr_section_; | |
e9552f7e ST |
1492 | // True if the input sections in the output sections should be sorted |
1493 | // as specified in a section ordering file. | |
1494 | bool section_ordering_specified_; | |
16164a6b ST |
1495 | // True if some input sections need to be mapped to a unique segment, |
1496 | // after being mapped to a unique Output_section. | |
1497 | bool unique_segment_for_sections_specified_; | |
3ce2c28e ILT |
1498 | // In incremental build, holds information check the inputs and build the |
1499 | // .gnu_incremental_inputs section. | |
1500 | Incremental_inputs* incremental_inputs_; | |
20e6d0d6 DK |
1501 | // Whether we record output section data created in script |
1502 | bool record_output_section_data_from_script_; | |
cc5277b1 ML |
1503 | // Set if this is a slim LTO object not loaded with a compiler plugin |
1504 | bool lto_slim_object_; | |
9b547ce6 | 1505 | // List of output data that needs to be removed at relaxation clean up. |
20e6d0d6 DK |
1506 | Output_section_data_list script_output_section_data_list_; |
1507 | // Structure to save segment states before entering the relaxation loop. | |
1508 | Segment_states* segment_states_; | |
1509 | // A relaxation debug checker. We only create one when in debugging mode. | |
1510 | Relaxation_debug_check* relaxation_debug_check_; | |
f0558624 ST |
1511 | // Plugins specify section_ordering using this map. This is set in |
1512 | // update_section_order in plugin.cc | |
1513 | std::map<Section_id, unsigned int> section_order_map_; | |
16164a6b ST |
1514 | // This maps an input section to a unique segment. This is done by first |
1515 | // placing such input sections in unique output sections and then mapping | |
1516 | // the output section to a unique segment. Unique_segment_info stores | |
1517 | // any additional flags and alignment of the new segment. | |
1518 | Section_segment_map section_segment_map_; | |
6e9ba2ca ST |
1519 | // Hash a pattern to its position in the section ordering file. |
1520 | Unordered_map<std::string, unsigned int> input_section_position_; | |
1521 | // Vector of glob only patterns in the section_ordering file. | |
1522 | std::vector<std::string> input_section_glob_; | |
cdc29364 CC |
1523 | // For incremental links, the base file to be modified. |
1524 | Incremental_binary* incremental_base_; | |
1525 | // For incremental links, a list of free space within the file. | |
1526 | Free_list free_list_; | |
6c04fd9b CC |
1527 | // Program properties. |
1528 | Gnu_properties gnu_properties_; | |
61ba1cf9 ILT |
1529 | }; |
1530 | ||
730cdc88 ILT |
1531 | // This task handles writing out data in output sections which is not |
1532 | // part of an input section, or which requires special handling. When | |
1533 | // this is done, it unblocks both output_sections_blocker and | |
1534 | // final_blocker. | |
1535 | ||
1536 | class Write_sections_task : public Task | |
1537 | { | |
1538 | public: | |
1539 | Write_sections_task(const Layout* layout, Output_file* of, | |
1540 | Task_token* output_sections_blocker, | |
635aa30e | 1541 | Task_token* input_sections_blocker, |
730cdc88 ILT |
1542 | Task_token* final_blocker) |
1543 | : layout_(layout), of_(of), | |
1544 | output_sections_blocker_(output_sections_blocker), | |
635aa30e | 1545 | input_sections_blocker_(input_sections_blocker), |
730cdc88 ILT |
1546 | final_blocker_(final_blocker) |
1547 | { } | |
1548 | ||
1549 | // The standard Task methods. | |
1550 | ||
17a1d0a9 ILT |
1551 | Task_token* |
1552 | is_runnable(); | |
730cdc88 | 1553 | |
17a1d0a9 ILT |
1554 | void |
1555 | locks(Task_locker*); | |
730cdc88 ILT |
1556 | |
1557 | void | |
1558 | run(Workqueue*); | |
1559 | ||
c7912668 ILT |
1560 | std::string |
1561 | get_name() const | |
1562 | { return "Write_sections_task"; } | |
1563 | ||
730cdc88 ILT |
1564 | private: |
1565 | class Write_sections_locker; | |
1566 | ||
1567 | const Layout* layout_; | |
1568 | Output_file* of_; | |
1569 | Task_token* output_sections_blocker_; | |
635aa30e | 1570 | Task_token* input_sections_blocker_; |
730cdc88 ILT |
1571 | Task_token* final_blocker_; |
1572 | }; | |
1573 | ||
61ba1cf9 ILT |
1574 | // This task handles writing out data which is not part of a section |
1575 | // or segment. | |
1576 | ||
1577 | class Write_data_task : public Task | |
1578 | { | |
1579 | public: | |
a3ad94ed | 1580 | Write_data_task(const Layout* layout, const Symbol_table* symtab, |
9025d29d ILT |
1581 | Output_file* of, Task_token* final_blocker) |
1582 | : layout_(layout), symtab_(symtab), of_(of), final_blocker_(final_blocker) | |
61ba1cf9 ILT |
1583 | { } |
1584 | ||
1585 | // The standard Task methods. | |
1586 | ||
17a1d0a9 ILT |
1587 | Task_token* |
1588 | is_runnable(); | |
61ba1cf9 | 1589 | |
17a1d0a9 ILT |
1590 | void |
1591 | locks(Task_locker*); | |
61ba1cf9 ILT |
1592 | |
1593 | void | |
1594 | run(Workqueue*); | |
1595 | ||
c7912668 ILT |
1596 | std::string |
1597 | get_name() const | |
1598 | { return "Write_data_task"; } | |
1599 | ||
61ba1cf9 ILT |
1600 | private: |
1601 | const Layout* layout_; | |
a3ad94ed | 1602 | const Symbol_table* symtab_; |
61ba1cf9 ILT |
1603 | Output_file* of_; |
1604 | Task_token* final_blocker_; | |
1605 | }; | |
1606 | ||
1607 | // This task handles writing out the global symbols. | |
1608 | ||
1609 | class Write_symbols_task : public Task | |
1610 | { | |
1611 | public: | |
d491d34e | 1612 | Write_symbols_task(const Layout* layout, const Symbol_table* symtab, |
43819297 | 1613 | const Input_objects* /*input_objects*/, |
16649710 ILT |
1614 | const Stringpool* sympool, const Stringpool* dynpool, |
1615 | Output_file* of, Task_token* final_blocker) | |
43819297 | 1616 | : layout_(layout), symtab_(symtab), |
d491d34e ILT |
1617 | sympool_(sympool), dynpool_(dynpool), of_(of), |
1618 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
1619 | { } |
1620 | ||
1621 | // The standard Task methods. | |
1622 | ||
17a1d0a9 ILT |
1623 | Task_token* |
1624 | is_runnable(); | |
61ba1cf9 | 1625 | |
17a1d0a9 ILT |
1626 | void |
1627 | locks(Task_locker*); | |
61ba1cf9 ILT |
1628 | |
1629 | void | |
1630 | run(Workqueue*); | |
1631 | ||
c7912668 ILT |
1632 | std::string |
1633 | get_name() const | |
1634 | { return "Write_symbols_task"; } | |
1635 | ||
61ba1cf9 | 1636 | private: |
d491d34e | 1637 | const Layout* layout_; |
61ba1cf9 | 1638 | const Symbol_table* symtab_; |
61ba1cf9 | 1639 | const Stringpool* sympool_; |
16649710 | 1640 | const Stringpool* dynpool_; |
61ba1cf9 ILT |
1641 | Output_file* of_; |
1642 | Task_token* final_blocker_; | |
1643 | }; | |
1644 | ||
730cdc88 ILT |
1645 | // This task handles writing out data in output sections which can't |
1646 | // be written out until all the input sections have been handled. | |
1647 | // This is for sections whose contents is based on the contents of | |
1648 | // other output sections. | |
1649 | ||
1650 | class Write_after_input_sections_task : public Task | |
1651 | { | |
1652 | public: | |
27bc2bce | 1653 | Write_after_input_sections_task(Layout* layout, Output_file* of, |
730cdc88 ILT |
1654 | Task_token* input_sections_blocker, |
1655 | Task_token* final_blocker) | |
1656 | : layout_(layout), of_(of), | |
1657 | input_sections_blocker_(input_sections_blocker), | |
1658 | final_blocker_(final_blocker) | |
1659 | { } | |
1660 | ||
1661 | // The standard Task methods. | |
1662 | ||
17a1d0a9 ILT |
1663 | Task_token* |
1664 | is_runnable(); | |
730cdc88 | 1665 | |
17a1d0a9 ILT |
1666 | void |
1667 | locks(Task_locker*); | |
730cdc88 ILT |
1668 | |
1669 | void | |
1670 | run(Workqueue*); | |
1671 | ||
c7912668 ILT |
1672 | std::string |
1673 | get_name() const | |
1674 | { return "Write_after_input_sections_task"; } | |
1675 | ||
730cdc88 | 1676 | private: |
27bc2bce | 1677 | Layout* layout_; |
730cdc88 ILT |
1678 | Output_file* of_; |
1679 | Task_token* input_sections_blocker_; | |
1680 | Task_token* final_blocker_; | |
1681 | }; | |
1682 | ||
9c7fe3c5 CC |
1683 | // This task function handles computation of the build id. |
1684 | // When using --build-id=tree, it schedules the tasks that | |
1685 | // compute the hashes for each chunk of the file. This task | |
1686 | // cannot run until we have finalized the size of the output | |
1687 | // file, after the completion of Write_after_input_sections_task. | |
1688 | ||
1689 | class Build_id_task_runner : public Task_function_runner | |
1690 | { | |
1691 | public: | |
1692 | Build_id_task_runner(const General_options* options, const Layout* layout, | |
1693 | Output_file* of) | |
1694 | : options_(options), layout_(layout), of_(of) | |
1695 | { } | |
1696 | ||
1697 | // Run the operation. | |
1698 | void | |
1699 | run(Workqueue*, const Task*); | |
1700 | ||
1701 | private: | |
1702 | const General_options* options_; | |
1703 | const Layout* layout_; | |
1704 | Output_file* of_; | |
1705 | }; | |
1706 | ||
92e059d8 | 1707 | // This task function handles closing the file. |
61ba1cf9 | 1708 | |
92e059d8 | 1709 | class Close_task_runner : public Task_function_runner |
61ba1cf9 ILT |
1710 | { |
1711 | public: | |
516cb3d0 | 1712 | Close_task_runner(const General_options* options, const Layout* layout, |
9c7fe3c5 CC |
1713 | Output_file* of, unsigned char* array_of_hashes, |
1714 | size_t size_of_hashes) | |
1715 | : options_(options), layout_(layout), of_(of), | |
1716 | array_of_hashes_(array_of_hashes), size_of_hashes_(size_of_hashes) | |
61ba1cf9 ILT |
1717 | { } |
1718 | ||
92e059d8 | 1719 | // Run the operation. |
61ba1cf9 | 1720 | void |
17a1d0a9 | 1721 | run(Workqueue*, const Task*); |
61ba1cf9 ILT |
1722 | |
1723 | private: | |
516cb3d0 ILT |
1724 | const General_options* options_; |
1725 | const Layout* layout_; | |
61ba1cf9 | 1726 | Output_file* of_; |
9c7fe3c5 CC |
1727 | unsigned char* const array_of_hashes_; |
1728 | const size_t size_of_hashes_; | |
a2fb1b05 ILT |
1729 | }; |
1730 | ||
ead1e424 ILT |
1731 | // A small helper function to align an address. |
1732 | ||
1733 | inline uint64_t | |
1734 | align_address(uint64_t address, uint64_t addralign) | |
1735 | { | |
1736 | if (addralign != 0) | |
1737 | address = (address + addralign - 1) &~ (addralign - 1); | |
1738 | return address; | |
1739 | } | |
1740 | ||
a2fb1b05 ILT |
1741 | } // End namespace gold. |
1742 | ||
1743 | #endif // !defined(GOLD_LAYOUT_H) |