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Commit | Line | Data |
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bae7f79e ILT |
1 | // object.cc -- support for an object file for linking in gold |
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 | ||
bae7f79e ILT |
24 | #include "gold.h" |
25 | ||
26 | #include <cerrno> | |
27 | #include <cstring> | |
645f8123 | 28 | #include <cstdarg> |
a2b1aa12 | 29 | #include "demangle.h" |
9a2d6984 | 30 | #include "libiberty.h" |
bae7f79e | 31 | |
6d03d481 | 32 | #include "gc.h" |
14bfc3f5 | 33 | #include "target-select.h" |
5c2c6c95 | 34 | #include "dwarf_reader.h" |
a2fb1b05 | 35 | #include "layout.h" |
61ba1cf9 | 36 | #include "output.h" |
f6ce93d6 | 37 | #include "symtab.h" |
92de84a6 | 38 | #include "cref.h" |
4c50553d | 39 | #include "reloc.h" |
f6ce93d6 ILT |
40 | #include "object.h" |
41 | #include "dynobj.h" | |
5995b570 | 42 | #include "plugin.h" |
a2e47362 | 43 | #include "compressed_output.h" |
09ec0418 | 44 | #include "incremental.h" |
bae7f79e ILT |
45 | |
46 | namespace gold | |
47 | { | |
48 | ||
00698fc5 CC |
49 | // Struct Read_symbols_data. |
50 | ||
51 | // Destroy any remaining File_view objects. | |
52 | ||
53 | Read_symbols_data::~Read_symbols_data() | |
54 | { | |
55 | if (this->section_headers != NULL) | |
56 | delete this->section_headers; | |
57 | if (this->section_names != NULL) | |
58 | delete this->section_names; | |
59 | if (this->symbols != NULL) | |
60 | delete this->symbols; | |
61 | if (this->symbol_names != NULL) | |
62 | delete this->symbol_names; | |
63 | if (this->versym != NULL) | |
64 | delete this->versym; | |
65 | if (this->verdef != NULL) | |
66 | delete this->verdef; | |
67 | if (this->verneed != NULL) | |
68 | delete this->verneed; | |
69 | } | |
70 | ||
d491d34e ILT |
71 | // Class Xindex. |
72 | ||
73 | // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX | |
74 | // section and read it in. SYMTAB_SHNDX is the index of the symbol | |
75 | // table we care about. | |
76 | ||
77 | template<int size, bool big_endian> | |
78 | void | |
2ea97941 | 79 | Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx) |
d491d34e ILT |
80 | { |
81 | if (!this->symtab_xindex_.empty()) | |
82 | return; | |
83 | ||
2ea97941 | 84 | gold_assert(symtab_shndx != 0); |
d491d34e ILT |
85 | |
86 | // Look through the sections in reverse order, on the theory that it | |
87 | // is more likely to be near the end than the beginning. | |
88 | unsigned int i = object->shnum(); | |
89 | while (i > 0) | |
90 | { | |
91 | --i; | |
92 | if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX | |
2ea97941 | 93 | && this->adjust_shndx(object->section_link(i)) == symtab_shndx) |
d491d34e ILT |
94 | { |
95 | this->read_symtab_xindex<size, big_endian>(object, i, NULL); | |
96 | return; | |
97 | } | |
98 | } | |
99 | ||
100 | object->error(_("missing SHT_SYMTAB_SHNDX section")); | |
101 | } | |
102 | ||
103 | // Read in the symtab_xindex_ array, given the section index of the | |
104 | // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the | |
105 | // section headers. | |
106 | ||
107 | template<int size, bool big_endian> | |
108 | void | |
109 | Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx, | |
110 | const unsigned char* pshdrs) | |
111 | { | |
112 | section_size_type bytecount; | |
113 | const unsigned char* contents; | |
114 | if (pshdrs == NULL) | |
115 | contents = object->section_contents(xindex_shndx, &bytecount, false); | |
116 | else | |
117 | { | |
118 | const unsigned char* p = (pshdrs | |
119 | + (xindex_shndx | |
120 | * elfcpp::Elf_sizes<size>::shdr_size)); | |
121 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
122 | bytecount = convert_to_section_size_type(shdr.get_sh_size()); | |
123 | contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false); | |
124 | } | |
125 | ||
126 | gold_assert(this->symtab_xindex_.empty()); | |
127 | this->symtab_xindex_.reserve(bytecount / 4); | |
128 | for (section_size_type i = 0; i < bytecount; i += 4) | |
129 | { | |
130 | unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i); | |
131 | // We preadjust the section indexes we save. | |
132 | this->symtab_xindex_.push_back(this->adjust_shndx(shndx)); | |
133 | } | |
134 | } | |
135 | ||
136 | // Symbol symndx has a section of SHN_XINDEX; return the real section | |
137 | // index. | |
138 | ||
139 | unsigned int | |
140 | Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx) | |
141 | { | |
142 | if (symndx >= this->symtab_xindex_.size()) | |
143 | { | |
144 | object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"), | |
145 | symndx); | |
146 | return elfcpp::SHN_UNDEF; | |
147 | } | |
148 | unsigned int shndx = this->symtab_xindex_[symndx]; | |
149 | if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum()) | |
150 | { | |
151 | object->error(_("extended index for symbol %u out of range: %u"), | |
152 | symndx, shndx); | |
153 | return elfcpp::SHN_UNDEF; | |
154 | } | |
155 | return shndx; | |
156 | } | |
157 | ||
645f8123 ILT |
158 | // Class Object. |
159 | ||
75f2446e ILT |
160 | // Report an error for this object file. This is used by the |
161 | // elfcpp::Elf_file interface, and also called by the Object code | |
162 | // itself. | |
645f8123 ILT |
163 | |
164 | void | |
75f2446e | 165 | Object::error(const char* format, ...) const |
645f8123 ILT |
166 | { |
167 | va_list args; | |
645f8123 | 168 | va_start(args, format); |
75f2446e ILT |
169 | char* buf = NULL; |
170 | if (vasprintf(&buf, format, args) < 0) | |
171 | gold_nomem(); | |
645f8123 | 172 | va_end(args); |
75f2446e ILT |
173 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
174 | free(buf); | |
645f8123 ILT |
175 | } |
176 | ||
177 | // Return a view of the contents of a section. | |
178 | ||
179 | const unsigned char* | |
8383303e ILT |
180 | Object::section_contents(unsigned int shndx, section_size_type* plen, |
181 | bool cache) | |
c1027032 | 182 | { return this->do_section_contents(shndx, plen, cache); } |
645f8123 | 183 | |
6fa2a40b | 184 | // Read the section data into SD. This is code common to Sized_relobj_file |
dbe717ef ILT |
185 | // and Sized_dynobj, so we put it into Object. |
186 | ||
187 | template<int size, bool big_endian> | |
188 | void | |
189 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
190 | Read_symbols_data* sd) | |
191 | { | |
192 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
193 | ||
194 | // Read the section headers. | |
195 | const off_t shoff = elf_file->shoff(); | |
2ea97941 ILT |
196 | const unsigned int shnum = this->shnum(); |
197 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, | |
39d0cb0e | 198 | true, true); |
dbe717ef ILT |
199 | |
200 | // Read the section names. | |
201 | const unsigned char* pshdrs = sd->section_headers->data(); | |
202 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
203 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
204 | ||
205 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
75f2446e ILT |
206 | this->error(_("section name section has wrong type: %u"), |
207 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
dbe717ef | 208 | |
8383303e ILT |
209 | sd->section_names_size = |
210 | convert_to_section_size_type(shdrnames.get_sh_size()); | |
dbe717ef | 211 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
39d0cb0e ILT |
212 | sd->section_names_size, false, |
213 | false); | |
dbe717ef ILT |
214 | } |
215 | ||
2ea97941 | 216 | // If NAME is the name of a special .gnu.warning section, arrange for |
dbe717ef ILT |
217 | // the warning to be issued. SHNDX is the section index. Return |
218 | // whether it is a warning section. | |
219 | ||
220 | bool | |
2ea97941 | 221 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
dbe717ef ILT |
222 | Symbol_table* symtab) |
223 | { | |
224 | const char warn_prefix[] = ".gnu.warning."; | |
225 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
2ea97941 | 226 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
dbe717ef | 227 | { |
cb295612 ILT |
228 | // Read the section contents to get the warning text. It would |
229 | // be nicer if we only did this if we have to actually issue a | |
230 | // warning. Unfortunately, warnings are issued as we relocate | |
231 | // sections. That means that we can not lock the object then, | |
232 | // as we might try to issue the same warning multiple times | |
233 | // simultaneously. | |
234 | section_size_type len; | |
235 | const unsigned char* contents = this->section_contents(shndx, &len, | |
236 | false); | |
8d63875c ILT |
237 | if (len == 0) |
238 | { | |
2ea97941 | 239 | const char* warning = name + warn_prefix_len; |
8d63875c ILT |
240 | contents = reinterpret_cast<const unsigned char*>(warning); |
241 | len = strlen(warning); | |
242 | } | |
cb295612 | 243 | std::string warning(reinterpret_cast<const char*>(contents), len); |
2ea97941 | 244 | symtab->add_warning(name + warn_prefix_len, this, warning); |
dbe717ef ILT |
245 | return true; |
246 | } | |
247 | return false; | |
248 | } | |
249 | ||
2ea97941 | 250 | // If NAME is the name of the special section which indicates that |
9b547ce6 | 251 | // this object was compiled with -fsplit-stack, mark it accordingly. |
364c7fa5 ILT |
252 | |
253 | bool | |
2ea97941 | 254 | Object::handle_split_stack_section(const char* name) |
364c7fa5 | 255 | { |
2ea97941 | 256 | if (strcmp(name, ".note.GNU-split-stack") == 0) |
364c7fa5 ILT |
257 | { |
258 | this->uses_split_stack_ = true; | |
259 | return true; | |
260 | } | |
2ea97941 | 261 | if (strcmp(name, ".note.GNU-no-split-stack") == 0) |
364c7fa5 ILT |
262 | { |
263 | this->has_no_split_stack_ = true; | |
264 | return true; | |
265 | } | |
266 | return false; | |
267 | } | |
268 | ||
6d03d481 ST |
269 | // Class Relobj |
270 | ||
271 | // To copy the symbols data read from the file to a local data structure. | |
2e702c99 | 272 | // This function is called from do_layout only while doing garbage |
6d03d481 ST |
273 | // collection. |
274 | ||
275 | void | |
2e702c99 RM |
276 | Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, |
277 | unsigned int section_header_size) | |
6d03d481 | 278 | { |
2e702c99 RM |
279 | gc_sd->section_headers_data = |
280 | new unsigned char[(section_header_size)]; | |
6d03d481 | 281 | memcpy(gc_sd->section_headers_data, sd->section_headers->data(), |
2e702c99 RM |
282 | section_header_size); |
283 | gc_sd->section_names_data = | |
284 | new unsigned char[sd->section_names_size]; | |
6d03d481 | 285 | memcpy(gc_sd->section_names_data, sd->section_names->data(), |
2e702c99 | 286 | sd->section_names_size); |
6d03d481 ST |
287 | gc_sd->section_names_size = sd->section_names_size; |
288 | if (sd->symbols != NULL) | |
289 | { | |
2e702c99 RM |
290 | gc_sd->symbols_data = |
291 | new unsigned char[sd->symbols_size]; | |
6d03d481 | 292 | memcpy(gc_sd->symbols_data, sd->symbols->data(), |
2e702c99 | 293 | sd->symbols_size); |
6d03d481 ST |
294 | } |
295 | else | |
296 | { | |
297 | gc_sd->symbols_data = NULL; | |
298 | } | |
299 | gc_sd->symbols_size = sd->symbols_size; | |
300 | gc_sd->external_symbols_offset = sd->external_symbols_offset; | |
301 | if (sd->symbol_names != NULL) | |
302 | { | |
303 | gc_sd->symbol_names_data = | |
2e702c99 | 304 | new unsigned char[sd->symbol_names_size]; |
6d03d481 | 305 | memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(), |
2e702c99 | 306 | sd->symbol_names_size); |
6d03d481 ST |
307 | } |
308 | else | |
309 | { | |
310 | gc_sd->symbol_names_data = NULL; | |
311 | } | |
312 | gc_sd->symbol_names_size = sd->symbol_names_size; | |
313 | } | |
314 | ||
315 | // This function determines if a particular section name must be included | |
316 | // in the link. This is used during garbage collection to determine the | |
317 | // roots of the worklist. | |
318 | ||
319 | bool | |
2ea97941 | 320 | Relobj::is_section_name_included(const char* name) |
6d03d481 | 321 | { |
2e702c99 RM |
322 | if (is_prefix_of(".ctors", name) |
323 | || is_prefix_of(".dtors", name) | |
324 | || is_prefix_of(".note", name) | |
325 | || is_prefix_of(".init", name) | |
326 | || is_prefix_of(".fini", name) | |
327 | || is_prefix_of(".gcc_except_table", name) | |
328 | || is_prefix_of(".jcr", name) | |
329 | || is_prefix_of(".preinit_array", name) | |
330 | || (is_prefix_of(".text", name) | |
331 | && strstr(name, "personality")) | |
332 | || (is_prefix_of(".data", name) | |
333 | && strstr(name, "personality")) | |
fa618ee4 ILT |
334 | || (is_prefix_of(".gnu.linkonce.d", name) |
335 | && strstr(name, "personality"))) | |
6d03d481 | 336 | { |
2e702c99 | 337 | return true; |
6d03d481 ST |
338 | } |
339 | return false; | |
340 | } | |
341 | ||
09ec0418 CC |
342 | // Finalize the incremental relocation information. Allocates a block |
343 | // of relocation entries for each symbol, and sets the reloc_bases_ | |
cdc29364 CC |
344 | // array to point to the first entry in each block. If CLEAR_COUNTS |
345 | // is TRUE, also clear the per-symbol relocation counters. | |
09ec0418 CC |
346 | |
347 | void | |
cdc29364 | 348 | Relobj::finalize_incremental_relocs(Layout* layout, bool clear_counts) |
09ec0418 CC |
349 | { |
350 | unsigned int nsyms = this->get_global_symbols()->size(); | |
351 | this->reloc_bases_ = new unsigned int[nsyms]; | |
352 | ||
353 | gold_assert(this->reloc_bases_ != NULL); | |
354 | gold_assert(layout->incremental_inputs() != NULL); | |
355 | ||
356 | unsigned int rindex = layout->incremental_inputs()->get_reloc_count(); | |
357 | for (unsigned int i = 0; i < nsyms; ++i) | |
358 | { | |
359 | this->reloc_bases_[i] = rindex; | |
360 | rindex += this->reloc_counts_[i]; | |
cdc29364 CC |
361 | if (clear_counts) |
362 | this->reloc_counts_[i] = 0; | |
09ec0418 CC |
363 | } |
364 | layout->incremental_inputs()->set_reloc_count(rindex); | |
365 | } | |
366 | ||
f6ce93d6 | 367 | // Class Sized_relobj. |
bae7f79e | 368 | |
6fa2a40b CC |
369 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
370 | // associated with a local symbol. | |
371 | ||
bae7f79e | 372 | template<int size, bool big_endian> |
6fa2a40b CC |
373 | void |
374 | Sized_relobj<size, big_endian>::do_for_all_local_got_entries( | |
375 | Got_offset_list::Visitor* v) const | |
376 | { | |
377 | unsigned int nsyms = this->local_symbol_count(); | |
378 | for (unsigned int i = 0; i < nsyms; i++) | |
379 | { | |
380 | Local_got_offsets::const_iterator p = this->local_got_offsets_.find(i); | |
381 | if (p != this->local_got_offsets_.end()) | |
382 | { | |
383 | const Got_offset_list* got_offsets = p->second; | |
384 | got_offsets->for_all_got_offsets(v); | |
385 | } | |
386 | } | |
387 | } | |
388 | ||
389 | // Class Sized_relobj_file. | |
390 | ||
391 | template<int size, bool big_endian> | |
392 | Sized_relobj_file<size, big_endian>::Sized_relobj_file( | |
2ea97941 ILT |
393 | const std::string& name, |
394 | Input_file* input_file, | |
395 | off_t offset, | |
bae7f79e | 396 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
6fa2a40b | 397 | : Sized_relobj<size, big_endian>(name, input_file, offset), |
645f8123 | 398 | elf_file_(this, ehdr), |
dbe717ef | 399 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
400 | local_symbol_count_(0), |
401 | output_local_symbol_count_(0), | |
7bf1f802 | 402 | output_local_dynsym_count_(0), |
730cdc88 | 403 | symbols_(), |
92de84a6 | 404 | defined_count_(0), |
61ba1cf9 | 405 | local_symbol_offset_(0), |
7bf1f802 | 406 | local_dynsym_offset_(0), |
e727fa71 | 407 | local_values_(), |
7223e9ca | 408 | local_plt_offsets_(), |
ef9beddf | 409 | kept_comdat_sections_(), |
805bb01c | 410 | has_eh_frame_(false), |
a2e47362 CC |
411 | discarded_eh_frame_shndx_(-1U), |
412 | deferred_layout_(), | |
413 | deferred_layout_relocs_(), | |
414 | compressed_sections_() | |
bae7f79e | 415 | { |
9590bf25 | 416 | this->e_type_ = ehdr.get_e_type(); |
bae7f79e ILT |
417 | } |
418 | ||
419 | template<int size, bool big_endian> | |
6fa2a40b | 420 | Sized_relobj_file<size, big_endian>::~Sized_relobj_file() |
bae7f79e ILT |
421 | { |
422 | } | |
423 | ||
645f8123 | 424 | // Set up an object file based on the file header. This sets up the |
029ba973 | 425 | // section information. |
bae7f79e ILT |
426 | |
427 | template<int size, bool big_endian> | |
428 | void | |
6fa2a40b | 429 | Sized_relobj_file<size, big_endian>::do_setup() |
bae7f79e | 430 | { |
2ea97941 ILT |
431 | const unsigned int shnum = this->elf_file_.shnum(); |
432 | this->set_shnum(shnum); | |
dbe717ef | 433 | } |
12e14209 | 434 | |
dbe717ef ILT |
435 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
436 | // standard says that maybe in the future there can be more than one | |
437 | // SHT_SYMTAB section. Until somebody figures out how that could | |
438 | // work, we assume there is only one. | |
12e14209 | 439 | |
dbe717ef ILT |
440 | template<int size, bool big_endian> |
441 | void | |
6fa2a40b | 442 | Sized_relobj_file<size, big_endian>::find_symtab(const unsigned char* pshdrs) |
dbe717ef | 443 | { |
2ea97941 | 444 | const unsigned int shnum = this->shnum(); |
dbe717ef | 445 | this->symtab_shndx_ = 0; |
2ea97941 | 446 | if (shnum > 0) |
bae7f79e | 447 | { |
dbe717ef ILT |
448 | // Look through the sections in reverse order, since gas tends |
449 | // to put the symbol table at the end. | |
2ea97941 ILT |
450 | const unsigned char* p = pshdrs + shnum * This::shdr_size; |
451 | unsigned int i = shnum; | |
d491d34e ILT |
452 | unsigned int xindex_shndx = 0; |
453 | unsigned int xindex_link = 0; | |
dbe717ef | 454 | while (i > 0) |
bae7f79e | 455 | { |
dbe717ef ILT |
456 | --i; |
457 | p -= This::shdr_size; | |
458 | typename This::Shdr shdr(p); | |
459 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
460 | { | |
461 | this->symtab_shndx_ = i; | |
d491d34e ILT |
462 | if (xindex_shndx > 0 && xindex_link == i) |
463 | { | |
464 | Xindex* xindex = | |
465 | new Xindex(this->elf_file_.large_shndx_offset()); | |
466 | xindex->read_symtab_xindex<size, big_endian>(this, | |
467 | xindex_shndx, | |
468 | pshdrs); | |
469 | this->set_xindex(xindex); | |
470 | } | |
dbe717ef ILT |
471 | break; |
472 | } | |
d491d34e ILT |
473 | |
474 | // Try to pick up the SHT_SYMTAB_SHNDX section, if there is | |
475 | // one. This will work if it follows the SHT_SYMTAB | |
476 | // section. | |
477 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX) | |
478 | { | |
479 | xindex_shndx = i; | |
480 | xindex_link = this->adjust_shndx(shdr.get_sh_link()); | |
481 | } | |
bae7f79e | 482 | } |
bae7f79e ILT |
483 | } |
484 | } | |
485 | ||
d491d34e ILT |
486 | // Return the Xindex structure to use for object with lots of |
487 | // sections. | |
488 | ||
489 | template<int size, bool big_endian> | |
490 | Xindex* | |
6fa2a40b | 491 | Sized_relobj_file<size, big_endian>::do_initialize_xindex() |
d491d34e ILT |
492 | { |
493 | gold_assert(this->symtab_shndx_ != -1U); | |
494 | Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset()); | |
495 | xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_); | |
496 | return xindex; | |
497 | } | |
498 | ||
730cdc88 ILT |
499 | // Return whether SHDR has the right type and flags to be a GNU |
500 | // .eh_frame section. | |
501 | ||
502 | template<int size, bool big_endian> | |
503 | bool | |
6fa2a40b | 504 | Sized_relobj_file<size, big_endian>::check_eh_frame_flags( |
730cdc88 ILT |
505 | const elfcpp::Shdr<size, big_endian>* shdr) const |
506 | { | |
4d5e4e62 ILT |
507 | elfcpp::Elf_Word sh_type = shdr->get_sh_type(); |
508 | return ((sh_type == elfcpp::SHT_PROGBITS | |
509 | || sh_type == elfcpp::SHT_X86_64_UNWIND) | |
1650c4ff | 510 | && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 ILT |
511 | } |
512 | ||
cf43a2fe AM |
513 | // Find the section header with the given name. |
514 | ||
515 | template<int size, bool big_endian> | |
516 | const unsigned char* | |
517 | Sized_relobj_file<size, big_endian>::find_shdr( | |
518 | const unsigned char* pshdrs, | |
519 | const char* name, | |
520 | const char* names, | |
521 | section_size_type names_size, | |
522 | const unsigned char* hdr) const | |
523 | { | |
524 | const unsigned int shnum = this->shnum(); | |
525 | const unsigned char* hdr_end = pshdrs + This::shdr_size * shnum; | |
526 | size_t sh_name = 0; | |
527 | ||
528 | while (1) | |
529 | { | |
530 | if (hdr) | |
531 | { | |
532 | // We found HDR last time we were called, continue looking. | |
533 | typename This::Shdr shdr(hdr); | |
534 | sh_name = shdr.get_sh_name(); | |
535 | } | |
536 | else | |
537 | { | |
538 | // Look for the next occurrence of NAME in NAMES. | |
539 | // The fact that .shstrtab produced by current GNU tools is | |
540 | // string merged means we shouldn't have both .not.foo and | |
541 | // .foo in .shstrtab, and multiple .foo sections should all | |
542 | // have the same sh_name. However, this is not guaranteed | |
543 | // by the ELF spec and not all ELF object file producers may | |
544 | // be so clever. | |
545 | size_t len = strlen(name) + 1; | |
546 | const char *p = sh_name ? names + sh_name + len : names; | |
547 | p = reinterpret_cast<const char*>(memmem(p, names_size - (p - names), | |
548 | name, len)); | |
549 | if (p == NULL) | |
550 | return NULL; | |
551 | sh_name = p - names; | |
552 | hdr = pshdrs; | |
553 | if (sh_name == 0) | |
554 | return hdr; | |
555 | } | |
556 | ||
557 | hdr += This::shdr_size; | |
558 | while (hdr < hdr_end) | |
559 | { | |
560 | typename This::Shdr shdr(hdr); | |
561 | if (shdr.get_sh_name() == sh_name) | |
562 | return hdr; | |
563 | hdr += This::shdr_size; | |
564 | } | |
565 | hdr = NULL; | |
566 | if (sh_name == 0) | |
567 | return hdr; | |
568 | } | |
569 | } | |
570 | ||
730cdc88 ILT |
571 | // Return whether there is a GNU .eh_frame section, given the section |
572 | // headers and the section names. | |
573 | ||
574 | template<int size, bool big_endian> | |
575 | bool | |
6fa2a40b | 576 | Sized_relobj_file<size, big_endian>::find_eh_frame( |
8383303e ILT |
577 | const unsigned char* pshdrs, |
578 | const char* names, | |
579 | section_size_type names_size) const | |
730cdc88 | 580 | { |
cf43a2fe AM |
581 | const unsigned char* s = NULL; |
582 | ||
583 | while (1) | |
730cdc88 | 584 | { |
cf43a2fe AM |
585 | s = this->find_shdr(pshdrs, ".eh_frame", names, names_size, s); |
586 | if (s == NULL) | |
587 | return false; | |
730cdc88 | 588 | |
cf43a2fe AM |
589 | typename This::Shdr shdr(s); |
590 | if (this->check_eh_frame_flags(&shdr)) | |
591 | return true; | |
730cdc88 | 592 | } |
730cdc88 ILT |
593 | } |
594 | ||
5dd8762a | 595 | // Return TRUE if this is a section whose contents will be needed in the |
c1027032 CC |
596 | // Add_symbols task. This function is only called for sections that have |
597 | // already passed the test in is_compressed_debug_section(), so we know | |
598 | // that the section name begins with ".zdebug". | |
5dd8762a CC |
599 | |
600 | static bool | |
601 | need_decompressed_section(const char* name) | |
602 | { | |
c1027032 CC |
603 | // Skip over the ".zdebug" and a quick check for the "_". |
604 | name += 7; | |
605 | if (*name++ != '_') | |
606 | return false; | |
607 | ||
608 | #ifdef ENABLE_THREADS | |
609 | // Decompressing these sections now will help only if we're | |
610 | // multithreaded. | |
611 | if (parameters->options().threads()) | |
612 | { | |
613 | // We will need .zdebug_str if this is not an incremental link | |
614 | // (i.e., we are processing string merge sections) or if we need | |
615 | // to build a gdb index. | |
616 | if ((!parameters->incremental() || parameters->options().gdb_index()) | |
617 | && strcmp(name, "str") == 0) | |
618 | return true; | |
619 | ||
620 | // We will need these other sections when building a gdb index. | |
621 | if (parameters->options().gdb_index() | |
622 | && (strcmp(name, "info") == 0 | |
623 | || strcmp(name, "types") == 0 | |
624 | || strcmp(name, "pubnames") == 0 | |
625 | || strcmp(name, "pubtypes") == 0 | |
626 | || strcmp(name, "ranges") == 0 | |
627 | || strcmp(name, "abbrev") == 0)) | |
628 | return true; | |
629 | } | |
630 | #endif | |
631 | ||
632 | // Even when single-threaded, we will need .zdebug_str if this is | |
633 | // not an incremental link and we are building a gdb index. | |
634 | // Otherwise, we would decompress the section twice: once for | |
635 | // string merge processing, and once for building the gdb index. | |
636 | if (!parameters->incremental() | |
637 | && parameters->options().gdb_index() | |
638 | && strcmp(name, "str") == 0) | |
5dd8762a CC |
639 | return true; |
640 | ||
641 | return false; | |
642 | } | |
643 | ||
a2e47362 | 644 | // Build a table for any compressed debug sections, mapping each section index |
5dd8762a | 645 | // to the uncompressed size and (if needed) the decompressed contents. |
a2e47362 CC |
646 | |
647 | template<int size, bool big_endian> | |
648 | Compressed_section_map* | |
649 | build_compressed_section_map( | |
650 | const unsigned char* pshdrs, | |
651 | unsigned int shnum, | |
652 | const char* names, | |
653 | section_size_type names_size, | |
6fa2a40b | 654 | Sized_relobj_file<size, big_endian>* obj) |
a2e47362 | 655 | { |
5dd8762a | 656 | Compressed_section_map* uncompressed_map = new Compressed_section_map(); |
a2e47362 CC |
657 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
658 | const unsigned char* p = pshdrs + shdr_size; | |
5dd8762a | 659 | |
a2e47362 CC |
660 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) |
661 | { | |
662 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
663 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS | |
664 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
665 | { | |
666 | if (shdr.get_sh_name() >= names_size) | |
667 | { | |
668 | obj->error(_("bad section name offset for section %u: %lu"), | |
669 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
670 | continue; | |
671 | } | |
672 | ||
673 | const char* name = names + shdr.get_sh_name(); | |
674 | if (is_compressed_debug_section(name)) | |
675 | { | |
676 | section_size_type len; | |
677 | const unsigned char* contents = | |
678 | obj->section_contents(i, &len, false); | |
679 | uint64_t uncompressed_size = get_uncompressed_size(contents, len); | |
c1027032 CC |
680 | Compressed_section_info info; |
681 | info.size = convert_to_section_size_type(uncompressed_size); | |
682 | info.contents = NULL; | |
a2e47362 | 683 | if (uncompressed_size != -1ULL) |
5dd8762a | 684 | { |
c1027032 CC |
685 | unsigned char* uncompressed_data = NULL; |
686 | if (need_decompressed_section(name)) | |
5dd8762a | 687 | { |
c1027032 CC |
688 | uncompressed_data = new unsigned char[uncompressed_size]; |
689 | if (decompress_input_section(contents, len, | |
690 | uncompressed_data, | |
691 | uncompressed_size)) | |
692 | info.contents = uncompressed_data; | |
693 | else | |
694 | delete[] uncompressed_data; | |
5dd8762a | 695 | } |
5dd8762a CC |
696 | (*uncompressed_map)[i] = info; |
697 | } | |
a2e47362 CC |
698 | } |
699 | } | |
700 | } | |
5dd8762a | 701 | return uncompressed_map; |
a2e47362 CC |
702 | } |
703 | ||
cf43a2fe AM |
704 | // Stash away info for a number of special sections. |
705 | // Return true if any of the sections found require local symbols to be read. | |
706 | ||
707 | template<int size, bool big_endian> | |
708 | bool | |
709 | Sized_relobj_file<size, big_endian>::do_find_special_sections( | |
710 | Read_symbols_data* sd) | |
711 | { | |
712 | const unsigned char* const pshdrs = sd->section_headers->data(); | |
713 | const unsigned char* namesu = sd->section_names->data(); | |
714 | const char* names = reinterpret_cast<const char*>(namesu); | |
715 | ||
716 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) | |
717 | this->has_eh_frame_ = true; | |
718 | ||
719 | if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL) | |
720 | this->compressed_sections_ | |
721 | = build_compressed_section_map(pshdrs, this->shnum(), names, | |
722 | sd->section_names_size, this); | |
723 | return (this->has_eh_frame_ | |
724 | || (!parameters->options().relocatable() | |
725 | && parameters->options().gdb_index() | |
726 | && (memmem(names, sd->section_names_size, "debug_info", 12) == 0 | |
727 | || memmem(names, sd->section_names_size, "debug_types", | |
728 | 13) == 0))); | |
729 | } | |
730 | ||
12e14209 | 731 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
732 | |
733 | template<int size, bool big_endian> | |
12e14209 | 734 | void |
6fa2a40b | 735 | Sized_relobj_file<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 736 | { |
dbe717ef | 737 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 738 | |
dbe717ef ILT |
739 | const unsigned char* const pshdrs = sd->section_headers->data(); |
740 | ||
741 | this->find_symtab(pshdrs); | |
12e14209 | 742 | |
cf43a2fe | 743 | bool need_local_symbols = this->do_find_special_sections(sd); |
c1027032 | 744 | |
75f2446e ILT |
745 | sd->symbols = NULL; |
746 | sd->symbols_size = 0; | |
730cdc88 | 747 | sd->external_symbols_offset = 0; |
75f2446e ILT |
748 | sd->symbol_names = NULL; |
749 | sd->symbol_names_size = 0; | |
750 | ||
645f8123 | 751 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
752 | { |
753 | // No symbol table. Weird but legal. | |
12e14209 | 754 | return; |
bae7f79e ILT |
755 | } |
756 | ||
12e14209 ILT |
757 | // Get the symbol table section header. |
758 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 759 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 760 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
bae7f79e | 761 | |
c1027032 CC |
762 | // If this object has a .eh_frame section, or if building a .gdb_index |
763 | // section and there is debug info, we need all the symbols. | |
730cdc88 ILT |
764 | // Otherwise we only need the external symbols. While it would be |
765 | // simpler to just always read all the symbols, I've seen object | |
766 | // files with well over 2000 local symbols, which for a 64-bit | |
767 | // object file format is over 5 pages that we don't need to read | |
768 | // now. | |
769 | ||
2ea97941 | 770 | const int sym_size = This::sym_size; |
92e059d8 ILT |
771 | const unsigned int loccount = symtabshdr.get_sh_info(); |
772 | this->local_symbol_count_ = loccount; | |
7bf1f802 | 773 | this->local_values_.resize(loccount); |
2ea97941 | 774 | section_offset_type locsize = loccount * sym_size; |
730cdc88 | 775 | off_t dataoff = symtabshdr.get_sh_offset(); |
8383303e ILT |
776 | section_size_type datasize = |
777 | convert_to_section_size_type(symtabshdr.get_sh_size()); | |
730cdc88 | 778 | off_t extoff = dataoff + locsize; |
8383303e | 779 | section_size_type extsize = datasize - locsize; |
75f65a3e | 780 | |
c1027032 CC |
781 | off_t readoff = need_local_symbols ? dataoff : extoff; |
782 | section_size_type readsize = need_local_symbols ? datasize : extsize; | |
730cdc88 | 783 | |
3f2e6a2d CC |
784 | if (readsize == 0) |
785 | { | |
786 | // No external symbols. Also weird but also legal. | |
787 | return; | |
788 | } | |
789 | ||
39d0cb0e | 790 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false); |
bae7f79e ILT |
791 | |
792 | // Read the section header for the symbol names. | |
d491d34e | 793 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); |
dbe717ef | 794 | if (strtab_shndx >= this->shnum()) |
bae7f79e | 795 | { |
75f2446e ILT |
796 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
797 | return; | |
bae7f79e | 798 | } |
dbe717ef | 799 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
800 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
801 | { | |
75f2446e ILT |
802 | this->error(_("symbol table name section has wrong type: %u"), |
803 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
804 | return; | |
bae7f79e ILT |
805 | } |
806 | ||
807 | // Read the symbol names. | |
808 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
39d0cb0e ILT |
809 | strtabshdr.get_sh_size(), |
810 | false, true); | |
bae7f79e | 811 | |
12e14209 | 812 | sd->symbols = fvsymtab; |
730cdc88 | 813 | sd->symbols_size = readsize; |
c1027032 | 814 | sd->external_symbols_offset = need_local_symbols ? locsize : 0; |
12e14209 | 815 | sd->symbol_names = fvstrtab; |
8383303e ILT |
816 | sd->symbol_names_size = |
817 | convert_to_section_size_type(strtabshdr.get_sh_size()); | |
a2fb1b05 ILT |
818 | } |
819 | ||
730cdc88 | 820 | // Return the section index of symbol SYM. Set *VALUE to its value in |
d491d34e | 821 | // the object file. Set *IS_ORDINARY if this is an ordinary section |
9b547ce6 | 822 | // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE. |
d491d34e ILT |
823 | // Note that for a symbol which is not defined in this object file, |
824 | // this will set *VALUE to 0 and return SHN_UNDEF; it will not return | |
825 | // the final value of the symbol in the link. | |
730cdc88 ILT |
826 | |
827 | template<int size, bool big_endian> | |
828 | unsigned int | |
6fa2a40b CC |
829 | Sized_relobj_file<size, big_endian>::symbol_section_and_value(unsigned int sym, |
830 | Address* value, | |
831 | bool* is_ordinary) | |
730cdc88 | 832 | { |
8383303e | 833 | section_size_type symbols_size; |
730cdc88 ILT |
834 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
835 | &symbols_size, | |
836 | false); | |
837 | ||
838 | const size_t count = symbols_size / This::sym_size; | |
839 | gold_assert(sym < count); | |
840 | ||
841 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); | |
842 | *value = elfsym.get_st_value(); | |
d491d34e ILT |
843 | |
844 | return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary); | |
730cdc88 ILT |
845 | } |
846 | ||
a2fb1b05 ILT |
847 | // Return whether to include a section group in the link. LAYOUT is |
848 | // used to keep track of which section groups we have already seen. | |
849 | // INDEX is the index of the section group and SHDR is the section | |
850 | // header. If we do not want to include this group, we set bits in | |
851 | // OMIT for each section which should be discarded. | |
852 | ||
853 | template<int size, bool big_endian> | |
854 | bool | |
6fa2a40b | 855 | Sized_relobj_file<size, big_endian>::include_section_group( |
6a74a719 | 856 | Symbol_table* symtab, |
2ea97941 | 857 | Layout* layout, |
a2fb1b05 | 858 | unsigned int index, |
2ea97941 | 859 | const char* name, |
e94cf127 CC |
860 | const unsigned char* shdrs, |
861 | const char* section_names, | |
862 | section_size_type section_names_size, | |
a2fb1b05 ILT |
863 | std::vector<bool>* omit) |
864 | { | |
865 | // Read the section contents. | |
e94cf127 | 866 | typename This::Shdr shdr(shdrs + index * This::shdr_size); |
a2fb1b05 | 867 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
39d0cb0e | 868 | shdr.get_sh_size(), true, false); |
a2fb1b05 ILT |
869 | const elfcpp::Elf_Word* pword = |
870 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
871 | ||
872 | // The first word contains flags. We only care about COMDAT section | |
873 | // groups. Other section groups are always included in the link | |
874 | // just like ordinary sections. | |
f6ce93d6 | 875 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 | 876 | |
41f9cbbe ILT |
877 | // Look up the group signature, which is the name of a symbol. ELF |
878 | // uses a symbol name because some group signatures are long, and | |
879 | // the name is generally already in the symbol table, so it makes | |
880 | // sense to put the long string just once in .strtab rather than in | |
881 | // both .strtab and .shstrtab. | |
a2fb1b05 ILT |
882 | |
883 | // Get the appropriate symbol table header (this will normally be | |
884 | // the single SHT_SYMTAB section, but in principle it need not be). | |
d491d34e | 885 | const unsigned int link = this->adjust_shndx(shdr.get_sh_link()); |
645f8123 | 886 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
a2fb1b05 ILT |
887 | |
888 | // Read the symbol table entry. | |
d491d34e ILT |
889 | unsigned int symndx = shdr.get_sh_info(); |
890 | if (symndx >= symshdr.get_sh_size() / This::sym_size) | |
a2fb1b05 | 891 | { |
75f2446e | 892 | this->error(_("section group %u info %u out of range"), |
d491d34e | 893 | index, symndx); |
75f2446e | 894 | return false; |
a2fb1b05 | 895 | } |
d491d34e | 896 | off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size; |
39d0cb0e ILT |
897 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true, |
898 | false); | |
a2fb1b05 ILT |
899 | elfcpp::Sym<size, big_endian> sym(psym); |
900 | ||
a2fb1b05 | 901 | // Read the symbol table names. |
8383303e | 902 | section_size_type symnamelen; |
645f8123 | 903 | const unsigned char* psymnamesu; |
d491d34e ILT |
904 | psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()), |
905 | &symnamelen, true); | |
a2fb1b05 ILT |
906 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
907 | ||
908 | // Get the section group signature. | |
645f8123 | 909 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 | 910 | { |
75f2446e | 911 | this->error(_("symbol %u name offset %u out of range"), |
d491d34e | 912 | symndx, sym.get_st_name()); |
75f2446e | 913 | return false; |
a2fb1b05 ILT |
914 | } |
915 | ||
e94cf127 | 916 | std::string signature(psymnames + sym.get_st_name()); |
a2fb1b05 | 917 | |
ead1e424 ILT |
918 | // It seems that some versions of gas will create a section group |
919 | // associated with a section symbol, and then fail to give a name to | |
920 | // the section symbol. In such a case, use the name of the section. | |
645f8123 | 921 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
ead1e424 | 922 | { |
d491d34e ILT |
923 | bool is_ordinary; |
924 | unsigned int sym_shndx = this->adjust_sym_shndx(symndx, | |
925 | sym.get_st_shndx(), | |
926 | &is_ordinary); | |
927 | if (!is_ordinary || sym_shndx >= this->shnum()) | |
928 | { | |
929 | this->error(_("symbol %u invalid section index %u"), | |
930 | symndx, sym_shndx); | |
931 | return false; | |
932 | } | |
e94cf127 CC |
933 | typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size); |
934 | if (member_shdr.get_sh_name() < section_names_size) | |
2e702c99 | 935 | signature = section_names + member_shdr.get_sh_name(); |
ead1e424 ILT |
936 | } |
937 | ||
e94cf127 CC |
938 | // Record this section group in the layout, and see whether we've already |
939 | // seen one with the same signature. | |
8a4c0b0d | 940 | bool include_group; |
1ef4d87f ILT |
941 | bool is_comdat; |
942 | Kept_section* kept_section = NULL; | |
6a74a719 | 943 | |
8a4c0b0d | 944 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
1ef4d87f ILT |
945 | { |
946 | include_group = true; | |
947 | is_comdat = false; | |
948 | } | |
8a4c0b0d | 949 | else |
e94cf127 | 950 | { |
2ea97941 ILT |
951 | include_group = layout->find_or_add_kept_section(signature, |
952 | this, index, true, | |
953 | true, &kept_section); | |
1ef4d87f | 954 | is_comdat = true; |
6a74a719 | 955 | } |
a2fb1b05 | 956 | |
89d8a36b CC |
957 | if (is_comdat && include_group) |
958 | { | |
959 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); | |
960 | if (incremental_inputs != NULL) | |
961 | incremental_inputs->report_comdat_group(this, signature.c_str()); | |
962 | } | |
963 | ||
a2fb1b05 | 964 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
8825ac63 ILT |
965 | |
966 | std::vector<unsigned int> shndxes; | |
967 | bool relocate_group = include_group && parameters->options().relocatable(); | |
968 | if (relocate_group) | |
969 | shndxes.reserve(count - 1); | |
970 | ||
a2fb1b05 ILT |
971 | for (size_t i = 1; i < count; ++i) |
972 | { | |
1ef4d87f | 973 | elfcpp::Elf_Word shndx = |
8825ac63 ILT |
974 | this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i)); |
975 | ||
976 | if (relocate_group) | |
1ef4d87f | 977 | shndxes.push_back(shndx); |
8825ac63 | 978 | |
1ef4d87f | 979 | if (shndx >= this->shnum()) |
a2fb1b05 | 980 | { |
75f2446e | 981 | this->error(_("section %u in section group %u out of range"), |
1ef4d87f | 982 | shndx, index); |
75f2446e | 983 | continue; |
a2fb1b05 | 984 | } |
55438702 ILT |
985 | |
986 | // Check for an earlier section number, since we're going to get | |
987 | // it wrong--we may have already decided to include the section. | |
1ef4d87f | 988 | if (shndx < index) |
2e702c99 RM |
989 | this->error(_("invalid section group %u refers to earlier section %u"), |
990 | index, shndx); | |
55438702 | 991 | |
e94cf127 | 992 | // Get the name of the member section. |
1ef4d87f | 993 | typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size); |
e94cf127 | 994 | if (member_shdr.get_sh_name() >= section_names_size) |
2e702c99 RM |
995 | { |
996 | // This is an error, but it will be diagnosed eventually | |
997 | // in do_layout, so we don't need to do anything here but | |
998 | // ignore it. | |
999 | continue; | |
1000 | } | |
e94cf127 CC |
1001 | std::string mname(section_names + member_shdr.get_sh_name()); |
1002 | ||
1ef4d87f ILT |
1003 | if (include_group) |
1004 | { | |
1005 | if (is_comdat) | |
1006 | kept_section->add_comdat_section(mname, shndx, | |
1007 | member_shdr.get_sh_size()); | |
1008 | } | |
1009 | else | |
2e702c99 RM |
1010 | { |
1011 | (*omit)[shndx] = true; | |
1ef4d87f ILT |
1012 | |
1013 | if (is_comdat) | |
2e702c99 | 1014 | { |
1ef4d87f ILT |
1015 | Relobj* kept_object = kept_section->object(); |
1016 | if (kept_section->is_comdat()) | |
1017 | { | |
1018 | // Find the corresponding kept section, and store | |
1019 | // that info in the discarded section table. | |
1020 | unsigned int kept_shndx; | |
1021 | uint64_t kept_size; | |
1022 | if (kept_section->find_comdat_section(mname, &kept_shndx, | |
1023 | &kept_size)) | |
1024 | { | |
1025 | // We don't keep a mapping for this section if | |
1026 | // it has a different size. The mapping is only | |
1027 | // used for relocation processing, and we don't | |
1028 | // want to treat the sections as similar if the | |
1029 | // sizes are different. Checking the section | |
1030 | // size is the approach used by the GNU linker. | |
1031 | if (kept_size == member_shdr.get_sh_size()) | |
1032 | this->set_kept_comdat_section(shndx, kept_object, | |
1033 | kept_shndx); | |
1034 | } | |
1035 | } | |
1036 | else | |
1037 | { | |
1038 | // The existing section is a linkonce section. Add | |
1039 | // a mapping if there is exactly one section in the | |
1040 | // group (which is true when COUNT == 2) and if it | |
1041 | // is the same size. | |
1042 | if (count == 2 | |
1043 | && (kept_section->linkonce_size() | |
1044 | == member_shdr.get_sh_size())) | |
1045 | this->set_kept_comdat_section(shndx, kept_object, | |
1046 | kept_section->shndx()); | |
1047 | } | |
2e702c99 RM |
1048 | } |
1049 | } | |
a2fb1b05 ILT |
1050 | } |
1051 | ||
8825ac63 | 1052 | if (relocate_group) |
2ea97941 ILT |
1053 | layout->layout_group(symtab, this, index, name, signature.c_str(), |
1054 | shdr, flags, &shndxes); | |
8825ac63 | 1055 | |
e94cf127 | 1056 | return include_group; |
a2fb1b05 ILT |
1057 | } |
1058 | ||
1059 | // Whether to include a linkonce section in the link. NAME is the | |
1060 | // name of the section and SHDR is the section header. | |
1061 | ||
1062 | // Linkonce sections are a GNU extension implemented in the original | |
1063 | // GNU linker before section groups were defined. The semantics are | |
1064 | // that we only include one linkonce section with a given name. The | |
1065 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
1066 | // where T is the type of section and SYMNAME is the name of a symbol. | |
1067 | // In an attempt to make linkonce sections interact well with section | |
1068 | // groups, we try to identify SYMNAME and use it like a section group | |
1069 | // signature. We want to block section groups with that signature, | |
1070 | // but not other linkonce sections with that signature. We also use | |
1071 | // the full name of the linkonce section as a normal section group | |
1072 | // signature. | |
1073 | ||
1074 | template<int size, bool big_endian> | |
1075 | bool | |
6fa2a40b | 1076 | Sized_relobj_file<size, big_endian>::include_linkonce_section( |
2ea97941 | 1077 | Layout* layout, |
e94cf127 | 1078 | unsigned int index, |
2ea97941 | 1079 | const char* name, |
1ef4d87f | 1080 | const elfcpp::Shdr<size, big_endian>& shdr) |
a2fb1b05 | 1081 | { |
1ef4d87f | 1082 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); |
ad435a24 ILT |
1083 | // In general the symbol name we want will be the string following |
1084 | // the last '.'. However, we have to handle the case of | |
1085 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by | |
1086 | // some versions of gcc. So we use a heuristic: if the name starts | |
1087 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise | |
1088 | // we look for the last '.'. We can't always simply skip | |
1089 | // ".gnu.linkonce.X", because we have to deal with cases like | |
1090 | // ".gnu.linkonce.d.rel.ro.local". | |
1091 | const char* const linkonce_t = ".gnu.linkonce.t."; | |
1092 | const char* symname; | |
2ea97941 ILT |
1093 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) |
1094 | symname = name + strlen(linkonce_t); | |
ad435a24 | 1095 | else |
2ea97941 | 1096 | symname = strrchr(name, '.') + 1; |
e94cf127 | 1097 | std::string sig1(symname); |
2ea97941 | 1098 | std::string sig2(name); |
8a4c0b0d ILT |
1099 | Kept_section* kept1; |
1100 | Kept_section* kept2; | |
2ea97941 ILT |
1101 | bool include1 = layout->find_or_add_kept_section(sig1, this, index, false, |
1102 | false, &kept1); | |
1103 | bool include2 = layout->find_or_add_kept_section(sig2, this, index, false, | |
1104 | true, &kept2); | |
e94cf127 CC |
1105 | |
1106 | if (!include2) | |
1107 | { | |
1ef4d87f ILT |
1108 | // We are not including this section because we already saw the |
1109 | // name of the section as a signature. This normally implies | |
1110 | // that the kept section is another linkonce section. If it is | |
1111 | // the same size, record it as the section which corresponds to | |
1112 | // this one. | |
1113 | if (kept2->object() != NULL | |
1114 | && !kept2->is_comdat() | |
1115 | && kept2->linkonce_size() == sh_size) | |
1116 | this->set_kept_comdat_section(index, kept2->object(), kept2->shndx()); | |
e94cf127 CC |
1117 | } |
1118 | else if (!include1) | |
1119 | { | |
1120 | // The section is being discarded on the basis of its symbol | |
1121 | // name. This means that the corresponding kept section was | |
1122 | // part of a comdat group, and it will be difficult to identify | |
1123 | // the specific section within that group that corresponds to | |
1124 | // this linkonce section. We'll handle the simple case where | |
1125 | // the group has only one member section. Otherwise, it's not | |
1126 | // worth the effort. | |
1ef4d87f ILT |
1127 | unsigned int kept_shndx; |
1128 | uint64_t kept_size; | |
1129 | if (kept1->object() != NULL | |
1130 | && kept1->is_comdat() | |
1131 | && kept1->find_single_comdat_section(&kept_shndx, &kept_size) | |
1132 | && kept_size == sh_size) | |
1133 | this->set_kept_comdat_section(index, kept1->object(), kept_shndx); | |
1134 | } | |
1135 | else | |
1136 | { | |
1137 | kept1->set_linkonce_size(sh_size); | |
1138 | kept2->set_linkonce_size(sh_size); | |
e94cf127 CC |
1139 | } |
1140 | ||
a783673b | 1141 | return include1 && include2; |
a2fb1b05 ILT |
1142 | } |
1143 | ||
5995b570 CC |
1144 | // Layout an input section. |
1145 | ||
1146 | template<int size, bool big_endian> | |
1147 | inline void | |
14788a3f ILT |
1148 | Sized_relobj_file<size, big_endian>::layout_section( |
1149 | Layout* layout, | |
1150 | unsigned int shndx, | |
1151 | const char* name, | |
1152 | const typename This::Shdr& shdr, | |
1153 | unsigned int reloc_shndx, | |
1154 | unsigned int reloc_type) | |
5995b570 | 1155 | { |
2ea97941 ILT |
1156 | off_t offset; |
1157 | Output_section* os = layout->layout(this, shndx, name, shdr, | |
1158 | reloc_shndx, reloc_type, &offset); | |
5995b570 CC |
1159 | |
1160 | this->output_sections()[shndx] = os; | |
2ea97941 | 1161 | if (offset == -1) |
6fa2a40b | 1162 | this->section_offsets()[shndx] = invalid_address; |
5995b570 | 1163 | else |
6fa2a40b | 1164 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); |
5995b570 CC |
1165 | |
1166 | // If this section requires special handling, and if there are | |
1167 | // relocs that apply to it, then we must do the special handling | |
1168 | // before we apply the relocs. | |
2ea97941 | 1169 | if (offset == -1 && reloc_shndx != 0) |
5995b570 CC |
1170 | this->set_relocs_must_follow_section_writes(); |
1171 | } | |
1172 | ||
14788a3f ILT |
1173 | // Layout an input .eh_frame section. |
1174 | ||
1175 | template<int size, bool big_endian> | |
1176 | void | |
1177 | Sized_relobj_file<size, big_endian>::layout_eh_frame_section( | |
1178 | Layout* layout, | |
1179 | const unsigned char* symbols_data, | |
1180 | section_size_type symbols_size, | |
1181 | const unsigned char* symbol_names_data, | |
1182 | section_size_type symbol_names_size, | |
1183 | unsigned int shndx, | |
1184 | const typename This::Shdr& shdr, | |
1185 | unsigned int reloc_shndx, | |
1186 | unsigned int reloc_type) | |
1187 | { | |
1188 | gold_assert(this->has_eh_frame_); | |
1189 | ||
1190 | off_t offset; | |
1191 | Output_section* os = layout->layout_eh_frame(this, | |
1192 | symbols_data, | |
1193 | symbols_size, | |
1194 | symbol_names_data, | |
1195 | symbol_names_size, | |
1196 | shndx, | |
1197 | shdr, | |
1198 | reloc_shndx, | |
1199 | reloc_type, | |
1200 | &offset); | |
1201 | this->output_sections()[shndx] = os; | |
1202 | if (os == NULL || offset == -1) | |
1203 | { | |
1204 | // An object can contain at most one section holding exception | |
1205 | // frame information. | |
1206 | gold_assert(this->discarded_eh_frame_shndx_ == -1U); | |
1207 | this->discarded_eh_frame_shndx_ = shndx; | |
1208 | this->section_offsets()[shndx] = invalid_address; | |
1209 | } | |
1210 | else | |
1211 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); | |
1212 | ||
1213 | // If this section requires special handling, and if there are | |
1214 | // relocs that aply to it, then we must do the special handling | |
1215 | // before we apply the relocs. | |
1216 | if (os != NULL && offset == -1 && reloc_shndx != 0) | |
1217 | this->set_relocs_must_follow_section_writes(); | |
1218 | } | |
1219 | ||
a2fb1b05 ILT |
1220 | // Lay out the input sections. We walk through the sections and check |
1221 | // whether they should be included in the link. If they should, we | |
1222 | // pass them to the Layout object, which will return an output section | |
2e702c99 RM |
1223 | // and an offset. |
1224 | // During garbage collection (--gc-sections) and identical code folding | |
1225 | // (--icf), this function is called twice. When it is called the first | |
ef15dade | 1226 | // time, it is for setting up some sections as roots to a work-list for |
2e702c99 RM |
1227 | // --gc-sections and to do comdat processing. Actual layout happens the |
1228 | // second time around after all the relevant sections have been determined. | |
1229 | // The first time, is_worklist_ready or is_icf_ready is false. It is then | |
1230 | // set to true after the garbage collection worklist or identical code | |
1231 | // folding is processed and the relevant sections to be kept are | |
ef15dade | 1232 | // determined. Then, this function is called again to layout the sections. |
a2fb1b05 ILT |
1233 | |
1234 | template<int size, bool big_endian> | |
1235 | void | |
6fa2a40b CC |
1236 | Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, |
1237 | Layout* layout, | |
1238 | Read_symbols_data* sd) | |
a2fb1b05 | 1239 | { |
2ea97941 | 1240 | const unsigned int shnum = this->shnum(); |
2e702c99 RM |
1241 | bool is_gc_pass_one = ((parameters->options().gc_sections() |
1242 | && !symtab->gc()->is_worklist_ready()) | |
1243 | || (parameters->options().icf_enabled() | |
1244 | && !symtab->icf()->is_icf_ready())); | |
1245 | ||
1246 | bool is_gc_pass_two = ((parameters->options().gc_sections() | |
1247 | && symtab->gc()->is_worklist_ready()) | |
1248 | || (parameters->options().icf_enabled() | |
1249 | && symtab->icf()->is_icf_ready())); | |
ef15dade ST |
1250 | |
1251 | bool is_gc_or_icf = (parameters->options().gc_sections() | |
2e702c99 | 1252 | || parameters->options().icf_enabled()); |
ef15dade ST |
1253 | |
1254 | // Both is_gc_pass_one and is_gc_pass_two should not be true. | |
1255 | gold_assert(!(is_gc_pass_one && is_gc_pass_two)); | |
1256 | ||
2ea97941 | 1257 | if (shnum == 0) |
12e14209 | 1258 | return; |
e0ebcf42 | 1259 | Symbols_data* gc_sd = NULL; |
6d03d481 ST |
1260 | if (is_gc_pass_one) |
1261 | { | |
2e702c99 RM |
1262 | // During garbage collection save the symbols data to use it when |
1263 | // re-entering this function. | |
6d03d481 | 1264 | gc_sd = new Symbols_data; |
2ea97941 | 1265 | this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum); |
6d03d481 ST |
1266 | this->set_symbols_data(gc_sd); |
1267 | } | |
1268 | else if (is_gc_pass_two) | |
1269 | { | |
1270 | gc_sd = this->get_symbols_data(); | |
1271 | } | |
1272 | ||
1273 | const unsigned char* section_headers_data = NULL; | |
1274 | section_size_type section_names_size; | |
1275 | const unsigned char* symbols_data = NULL; | |
1276 | section_size_type symbols_size; | |
6d03d481 ST |
1277 | const unsigned char* symbol_names_data = NULL; |
1278 | section_size_type symbol_names_size; | |
2e702c99 | 1279 | |
ef15dade | 1280 | if (is_gc_or_icf) |
6d03d481 ST |
1281 | { |
1282 | section_headers_data = gc_sd->section_headers_data; | |
1283 | section_names_size = gc_sd->section_names_size; | |
1284 | symbols_data = gc_sd->symbols_data; | |
1285 | symbols_size = gc_sd->symbols_size; | |
6d03d481 ST |
1286 | symbol_names_data = gc_sd->symbol_names_data; |
1287 | symbol_names_size = gc_sd->symbol_names_size; | |
1288 | } | |
1289 | else | |
1290 | { | |
1291 | section_headers_data = sd->section_headers->data(); | |
1292 | section_names_size = sd->section_names_size; | |
1293 | if (sd->symbols != NULL) | |
2e702c99 | 1294 | symbols_data = sd->symbols->data(); |
6d03d481 | 1295 | symbols_size = sd->symbols_size; |
6d03d481 | 1296 | if (sd->symbol_names != NULL) |
2e702c99 | 1297 | symbol_names_data = sd->symbol_names->data(); |
6d03d481 ST |
1298 | symbol_names_size = sd->symbol_names_size; |
1299 | } | |
a2fb1b05 ILT |
1300 | |
1301 | // Get the section headers. | |
6d03d481 | 1302 | const unsigned char* shdrs = section_headers_data; |
e94cf127 | 1303 | const unsigned char* pshdrs; |
a2fb1b05 ILT |
1304 | |
1305 | // Get the section names. | |
2e702c99 RM |
1306 | const unsigned char* pnamesu = (is_gc_or_icf) |
1307 | ? gc_sd->section_names_data | |
1308 | : sd->section_names->data(); | |
ef15dade | 1309 | |
a2fb1b05 ILT |
1310 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
1311 | ||
5995b570 CC |
1312 | // If any input files have been claimed by plugins, we need to defer |
1313 | // actual layout until the replacement files have arrived. | |
1314 | const bool should_defer_layout = | |
1315 | (parameters->options().has_plugins() | |
1316 | && parameters->options().plugins()->should_defer_layout()); | |
1317 | unsigned int num_sections_to_defer = 0; | |
1318 | ||
730cdc88 ILT |
1319 | // For each section, record the index of the reloc section if any. |
1320 | // Use 0 to mean that there is no reloc section, -1U to mean that | |
1321 | // there is more than one. | |
2ea97941 ILT |
1322 | std::vector<unsigned int> reloc_shndx(shnum, 0); |
1323 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); | |
730cdc88 | 1324 | // Skip the first, dummy, section. |
e94cf127 | 1325 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1326 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
730cdc88 ILT |
1327 | { |
1328 | typename This::Shdr shdr(pshdrs); | |
1329 | ||
5995b570 CC |
1330 | // Count the number of sections whose layout will be deferred. |
1331 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
2e702c99 | 1332 | ++num_sections_to_defer; |
5995b570 | 1333 | |
730cdc88 ILT |
1334 | unsigned int sh_type = shdr.get_sh_type(); |
1335 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) | |
1336 | { | |
d491d34e | 1337 | unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1338 | if (target_shndx == 0 || target_shndx >= shnum) |
730cdc88 ILT |
1339 | { |
1340 | this->error(_("relocation section %u has bad info %u"), | |
1341 | i, target_shndx); | |
1342 | continue; | |
1343 | } | |
1344 | ||
1345 | if (reloc_shndx[target_shndx] != 0) | |
1346 | reloc_shndx[target_shndx] = -1U; | |
1347 | else | |
1348 | { | |
1349 | reloc_shndx[target_shndx] = i; | |
1350 | reloc_type[target_shndx] = sh_type; | |
1351 | } | |
1352 | } | |
1353 | } | |
1354 | ||
ef9beddf | 1355 | Output_sections& out_sections(this->output_sections()); |
6fa2a40b | 1356 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
ef9beddf | 1357 | |
6d03d481 ST |
1358 | if (!is_gc_pass_two) |
1359 | { | |
2ea97941 ILT |
1360 | out_sections.resize(shnum); |
1361 | out_section_offsets.resize(shnum); | |
6d03d481 | 1362 | } |
a2fb1b05 | 1363 | |
88dd47ac ILT |
1364 | // If we are only linking for symbols, then there is nothing else to |
1365 | // do here. | |
1366 | if (this->input_file()->just_symbols()) | |
1367 | { | |
6d03d481 | 1368 | if (!is_gc_pass_two) |
2e702c99 RM |
1369 | { |
1370 | delete sd->section_headers; | |
1371 | sd->section_headers = NULL; | |
1372 | delete sd->section_names; | |
1373 | sd->section_names = NULL; | |
1374 | } | |
88dd47ac ILT |
1375 | return; |
1376 | } | |
1377 | ||
5995b570 CC |
1378 | if (num_sections_to_defer > 0) |
1379 | { | |
1380 | parameters->options().plugins()->add_deferred_layout_object(this); | |
1381 | this->deferred_layout_.reserve(num_sections_to_defer); | |
1382 | } | |
1383 | ||
35cdfc9a ILT |
1384 | // Whether we've seen a .note.GNU-stack section. |
1385 | bool seen_gnu_stack = false; | |
1386 | // The flags of a .note.GNU-stack section. | |
1387 | uint64_t gnu_stack_flags = 0; | |
1388 | ||
a2fb1b05 | 1389 | // Keep track of which sections to omit. |
2ea97941 | 1390 | std::vector<bool> omit(shnum, false); |
a2fb1b05 | 1391 | |
7019cd25 | 1392 | // Keep track of reloc sections when emitting relocations. |
8851ecca | 1393 | const bool relocatable = parameters->options().relocatable(); |
2ea97941 ILT |
1394 | const bool emit_relocs = (relocatable |
1395 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1396 | std::vector<unsigned int> reloc_sections; |
1397 | ||
730cdc88 ILT |
1398 | // Keep track of .eh_frame sections. |
1399 | std::vector<unsigned int> eh_frame_sections; | |
1400 | ||
c1027032 CC |
1401 | // Keep track of .debug_info and .debug_types sections. |
1402 | std::vector<unsigned int> debug_info_sections; | |
1403 | std::vector<unsigned int> debug_types_sections; | |
1404 | ||
f6ce93d6 | 1405 | // Skip the first, dummy, section. |
e94cf127 | 1406 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1407 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 1408 | { |
75f65a3e | 1409 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 1410 | |
6d03d481 | 1411 | if (shdr.get_sh_name() >= section_names_size) |
a2fb1b05 | 1412 | { |
75f2446e ILT |
1413 | this->error(_("bad section name offset for section %u: %lu"), |
1414 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
1415 | return; | |
a2fb1b05 ILT |
1416 | } |
1417 | ||
2ea97941 | 1418 | const char* name = pnames + shdr.get_sh_name(); |
a2fb1b05 | 1419 | |
6d03d481 | 1420 | if (!is_gc_pass_two) |
2e702c99 RM |
1421 | { |
1422 | if (this->handle_gnu_warning_section(name, i, symtab)) | |
1423 | { | |
1424 | if (!relocatable && !parameters->options().shared()) | |
1425 | omit[i] = true; | |
6d03d481 | 1426 | } |
f6ce93d6 | 1427 | |
2e702c99 RM |
1428 | // The .note.GNU-stack section is special. It gives the |
1429 | // protection flags that this object file requires for the stack | |
1430 | // in memory. | |
1431 | if (strcmp(name, ".note.GNU-stack") == 0) | |
1432 | { | |
6d03d481 ST |
1433 | seen_gnu_stack = true; |
1434 | gnu_stack_flags |= shdr.get_sh_flags(); | |
1435 | omit[i] = true; | |
2e702c99 | 1436 | } |
35cdfc9a | 1437 | |
364c7fa5 ILT |
1438 | // The .note.GNU-split-stack section is also special. It |
1439 | // indicates that the object was compiled with | |
1440 | // -fsplit-stack. | |
2ea97941 | 1441 | if (this->handle_split_stack_section(name)) |
364c7fa5 | 1442 | { |
e588ea8d | 1443 | if (!relocatable && !parameters->options().shared()) |
364c7fa5 ILT |
1444 | omit[i] = true; |
1445 | } | |
1446 | ||
05a352e6 | 1447 | // Skip attributes section. |
2ea97941 | 1448 | if (parameters->target().is_attributes_section(name)) |
05a352e6 DK |
1449 | { |
1450 | omit[i] = true; | |
1451 | } | |
1452 | ||
2e702c99 RM |
1453 | bool discard = omit[i]; |
1454 | if (!discard) | |
1455 | { | |
6d03d481 | 1456 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) |
2e702c99 RM |
1457 | { |
1458 | if (!this->include_section_group(symtab, layout, i, name, | |
1459 | shdrs, pnames, | |
1460 | section_names_size, | |
1461 | &omit)) | |
1462 | discard = true; | |
1463 | } | |
1464 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 | |
1465 | && Layout::is_linkonce(name)) | |
1466 | { | |
1467 | if (!this->include_linkonce_section(layout, i, name, shdr)) | |
6d03d481 | 1468 | discard = true; |
2e702c99 | 1469 | } |
a2fb1b05 | 1470 | } |
a2fb1b05 | 1471 | |
09ec0418 CC |
1472 | // Add the section to the incremental inputs layout. |
1473 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); | |
cdc29364 CC |
1474 | if (incremental_inputs != NULL |
1475 | && !discard | |
aa06ae28 | 1476 | && can_incremental_update(shdr.get_sh_type())) |
4fb3a1c3 CC |
1477 | { |
1478 | off_t sh_size = shdr.get_sh_size(); | |
1479 | section_size_type uncompressed_size; | |
1480 | if (this->section_is_compressed(i, &uncompressed_size)) | |
1481 | sh_size = uncompressed_size; | |
1482 | incremental_inputs->report_input_section(this, i, name, sh_size); | |
1483 | } | |
09ec0418 | 1484 | |
2e702c99 RM |
1485 | if (discard) |
1486 | { | |
6d03d481 ST |
1487 | // Do not include this section in the link. |
1488 | out_sections[i] = NULL; | |
2e702c99 | 1489 | out_section_offsets[i] = invalid_address; |
6d03d481 | 1490 | continue; |
2e702c99 RM |
1491 | } |
1492 | } | |
1493 | ||
ef15dade | 1494 | if (is_gc_pass_one && parameters->options().gc_sections()) |
2e702c99 RM |
1495 | { |
1496 | if (this->is_section_name_included(name) | |
b9b2ae8b | 1497 | || layout->keep_input_section (this, name) |
2e702c99 RM |
1498 | || shdr.get_sh_type() == elfcpp::SHT_INIT_ARRAY |
1499 | || shdr.get_sh_type() == elfcpp::SHT_FINI_ARRAY) | |
1500 | { | |
1501 | symtab->gc()->worklist().push(Section_id(this, i)); | |
1502 | } | |
1503 | // If the section name XXX can be represented as a C identifier | |
1504 | // it cannot be discarded if there are references to | |
1505 | // __start_XXX and __stop_XXX symbols. These need to be | |
1506 | // specially handled. | |
1507 | if (is_cident(name)) | |
1508 | { | |
1509 | symtab->gc()->add_cident_section(name, Section_id(this, i)); | |
1510 | } | |
1511 | } | |
a2fb1b05 | 1512 | |
6a74a719 ILT |
1513 | // When doing a relocatable link we are going to copy input |
1514 | // reloc sections into the output. We only want to copy the | |
1515 | // ones associated with sections which are not being discarded. | |
1516 | // However, we don't know that yet for all sections. So save | |
6d03d481 ST |
1517 | // reloc sections and process them later. Garbage collection is |
1518 | // not triggered when relocatable code is desired. | |
2ea97941 | 1519 | if (emit_relocs |
6a74a719 ILT |
1520 | && (shdr.get_sh_type() == elfcpp::SHT_REL |
1521 | || shdr.get_sh_type() == elfcpp::SHT_RELA)) | |
1522 | { | |
1523 | reloc_sections.push_back(i); | |
1524 | continue; | |
1525 | } | |
1526 | ||
8851ecca | 1527 | if (relocatable && shdr.get_sh_type() == elfcpp::SHT_GROUP) |
6a74a719 ILT |
1528 | continue; |
1529 | ||
730cdc88 ILT |
1530 | // The .eh_frame section is special. It holds exception frame |
1531 | // information that we need to read in order to generate the | |
1532 | // exception frame header. We process these after all the other | |
1533 | // sections so that the exception frame reader can reliably | |
1534 | // determine which sections are being discarded, and discard the | |
1535 | // corresponding information. | |
8851ecca | 1536 | if (!relocatable |
2e702c99 RM |
1537 | && strcmp(name, ".eh_frame") == 0 |
1538 | && this->check_eh_frame_flags(&shdr)) | |
1539 | { | |
1540 | if (is_gc_pass_one) | |
1541 | { | |
1542 | out_sections[i] = reinterpret_cast<Output_section*>(1); | |
1543 | out_section_offsets[i] = invalid_address; | |
1544 | } | |
1545 | else if (should_defer_layout) | |
14788a3f ILT |
1546 | this->deferred_layout_.push_back(Deferred_layout(i, name, |
1547 | pshdrs, | |
1548 | reloc_shndx[i], | |
1549 | reloc_type[i])); | |
1550 | else | |
2e702c99 RM |
1551 | eh_frame_sections.push_back(i); |
1552 | continue; | |
1553 | } | |
730cdc88 | 1554 | |
ef15dade | 1555 | if (is_gc_pass_two && parameters->options().gc_sections()) |
2e702c99 RM |
1556 | { |
1557 | // This is executed during the second pass of garbage | |
1558 | // collection. do_layout has been called before and some | |
1559 | // sections have been already discarded. Simply ignore | |
1560 | // such sections this time around. | |
1561 | if (out_sections[i] == NULL) | |
1562 | { | |
1563 | gold_assert(out_section_offsets[i] == invalid_address); | |
1564 | continue; | |
1565 | } | |
1566 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) | |
1567 | && symtab->gc()->is_section_garbage(this, i)) | |
1568 | { | |
1569 | if (parameters->options().print_gc_sections()) | |
1570 | gold_info(_("%s: removing unused section from '%s'" | |
1571 | " in file '%s'"), | |
1572 | program_name, this->section_name(i).c_str(), | |
1573 | this->name().c_str()); | |
1574 | out_sections[i] = NULL; | |
1575 | out_section_offsets[i] = invalid_address; | |
1576 | continue; | |
1577 | } | |
1578 | } | |
ef15dade | 1579 | |
032ce4e9 | 1580 | if (is_gc_pass_two && parameters->options().icf_enabled()) |
2e702c99 RM |
1581 | { |
1582 | if (out_sections[i] == NULL) | |
1583 | { | |
1584 | gold_assert(out_section_offsets[i] == invalid_address); | |
1585 | continue; | |
1586 | } | |
1587 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) | |
1588 | && symtab->icf()->is_section_folded(this, i)) | |
1589 | { | |
1590 | if (parameters->options().print_icf_sections()) | |
1591 | { | |
1592 | Section_id folded = | |
1593 | symtab->icf()->get_folded_section(this, i); | |
1594 | Relobj* folded_obj = | |
1595 | reinterpret_cast<Relobj*>(folded.first); | |
1596 | gold_info(_("%s: ICF folding section '%s' in file '%s'" | |
1597 | "into '%s' in file '%s'"), | |
1598 | program_name, this->section_name(i).c_str(), | |
1599 | this->name().c_str(), | |
1600 | folded_obj->section_name(folded.second).c_str(), | |
1601 | folded_obj->name().c_str()); | |
1602 | } | |
1603 | out_sections[i] = NULL; | |
1604 | out_section_offsets[i] = invalid_address; | |
1605 | continue; | |
1606 | } | |
1607 | } | |
ef15dade | 1608 | |
6d03d481 ST |
1609 | // Defer layout here if input files are claimed by plugins. When gc |
1610 | // is turned on this function is called twice. For the second call | |
1611 | // should_defer_layout should be false. | |
5995b570 | 1612 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) |
2e702c99 RM |
1613 | { |
1614 | gold_assert(!is_gc_pass_two); | |
1615 | this->deferred_layout_.push_back(Deferred_layout(i, name, | |
1616 | pshdrs, | |
1617 | reloc_shndx[i], | |
1618 | reloc_type[i])); | |
1619 | // Put dummy values here; real values will be supplied by | |
1620 | // do_layout_deferred_sections. | |
1621 | out_sections[i] = reinterpret_cast<Output_section*>(2); | |
1622 | out_section_offsets[i] = invalid_address; | |
1623 | continue; | |
1624 | } | |
ef15dade | 1625 | |
6d03d481 ST |
1626 | // During gc_pass_two if a section that was previously deferred is |
1627 | // found, do not layout the section as layout_deferred_sections will | |
1628 | // do it later from gold.cc. | |
2e702c99 RM |
1629 | if (is_gc_pass_two |
1630 | && (out_sections[i] == reinterpret_cast<Output_section*>(2))) | |
1631 | continue; | |
6d03d481 ST |
1632 | |
1633 | if (is_gc_pass_one) | |
2e702c99 RM |
1634 | { |
1635 | // This is during garbage collection. The out_sections are | |
1636 | // assigned in the second call to this function. | |
1637 | out_sections[i] = reinterpret_cast<Output_section*>(1); | |
1638 | out_section_offsets[i] = invalid_address; | |
1639 | } | |
ef9beddf | 1640 | else |
2e702c99 RM |
1641 | { |
1642 | // When garbage collection is switched on the actual layout | |
1643 | // only happens in the second call. | |
1644 | this->layout_section(layout, i, name, shdr, reloc_shndx[i], | |
1645 | reloc_type[i]); | |
c1027032 CC |
1646 | |
1647 | // When generating a .gdb_index section, we do additional | |
1648 | // processing of .debug_info and .debug_types sections after all | |
1649 | // the other sections for the same reason as above. | |
1650 | if (!relocatable | |
1651 | && parameters->options().gdb_index() | |
1652 | && !(shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
1653 | { | |
1654 | if (strcmp(name, ".debug_info") == 0 | |
1655 | || strcmp(name, ".zdebug_info") == 0) | |
1656 | debug_info_sections.push_back(i); | |
1657 | else if (strcmp(name, ".debug_types") == 0 | |
1658 | || strcmp(name, ".zdebug_types") == 0) | |
1659 | debug_types_sections.push_back(i); | |
1660 | } | |
2e702c99 | 1661 | } |
12e14209 ILT |
1662 | } |
1663 | ||
459e9b03 | 1664 | if (!is_gc_pass_two) |
83e17bd5 | 1665 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this); |
35cdfc9a | 1666 | |
6a74a719 | 1667 | // When doing a relocatable link handle the reloc sections at the |
2e702c99 RM |
1668 | // end. Garbage collection and Identical Code Folding is not |
1669 | // turned on for relocatable code. | |
2ea97941 | 1670 | if (emit_relocs) |
6a74a719 | 1671 | this->size_relocatable_relocs(); |
ef15dade ST |
1672 | |
1673 | gold_assert(!(is_gc_or_icf) || reloc_sections.empty()); | |
1674 | ||
6a74a719 ILT |
1675 | for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin(); |
1676 | p != reloc_sections.end(); | |
1677 | ++p) | |
1678 | { | |
1679 | unsigned int i = *p; | |
1680 | const unsigned char* pshdr; | |
6d03d481 | 1681 | pshdr = section_headers_data + i * This::shdr_size; |
6a74a719 ILT |
1682 | typename This::Shdr shdr(pshdr); |
1683 | ||
d491d34e | 1684 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1685 | if (data_shndx >= shnum) |
6a74a719 ILT |
1686 | { |
1687 | // We already warned about this above. | |
1688 | continue; | |
1689 | } | |
1690 | ||
ef9beddf | 1691 | Output_section* data_section = out_sections[data_shndx]; |
f3a2388f | 1692 | if (data_section == reinterpret_cast<Output_section*>(2)) |
2e702c99 RM |
1693 | { |
1694 | // The layout for the data section was deferred, so we need | |
1695 | // to defer the relocation section, too. | |
f3a2388f | 1696 | const char* name = pnames + shdr.get_sh_name(); |
2e702c99 RM |
1697 | this->deferred_layout_relocs_.push_back( |
1698 | Deferred_layout(i, name, pshdr, 0, elfcpp::SHT_NULL)); | |
f3a2388f | 1699 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
2e702c99 RM |
1700 | out_section_offsets[i] = invalid_address; |
1701 | continue; | |
1702 | } | |
6a74a719 ILT |
1703 | if (data_section == NULL) |
1704 | { | |
ef9beddf | 1705 | out_sections[i] = NULL; |
2e702c99 | 1706 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1707 | continue; |
1708 | } | |
1709 | ||
1710 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
1711 | this->set_relocatable_relocs(i, rr); | |
1712 | ||
2ea97941 ILT |
1713 | Output_section* os = layout->layout_reloc(this, i, shdr, data_section, |
1714 | rr); | |
ef9beddf | 1715 | out_sections[i] = os; |
eff45813 | 1716 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1717 | } |
1718 | ||
730cdc88 | 1719 | // Handle the .eh_frame sections at the end. |
6d03d481 | 1720 | gold_assert(!is_gc_pass_one || eh_frame_sections.empty()); |
730cdc88 ILT |
1721 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); |
1722 | p != eh_frame_sections.end(); | |
1723 | ++p) | |
1724 | { | |
730cdc88 | 1725 | unsigned int i = *p; |
ca09d69a | 1726 | const unsigned char* pshdr; |
6d03d481 | 1727 | pshdr = section_headers_data + i * This::shdr_size; |
730cdc88 ILT |
1728 | typename This::Shdr shdr(pshdr); |
1729 | ||
14788a3f ILT |
1730 | this->layout_eh_frame_section(layout, |
1731 | symbols_data, | |
1732 | symbols_size, | |
1733 | symbol_names_data, | |
1734 | symbol_names_size, | |
1735 | i, | |
1736 | shdr, | |
1737 | reloc_shndx[i], | |
1738 | reloc_type[i]); | |
730cdc88 ILT |
1739 | } |
1740 | ||
c1027032 CC |
1741 | // When building a .gdb_index section, scan the .debug_info and |
1742 | // .debug_types sections. | |
1743 | gold_assert(!is_gc_pass_one | |
1744 | || (debug_info_sections.empty() && debug_types_sections.empty())); | |
1745 | for (std::vector<unsigned int>::const_iterator p | |
1746 | = debug_info_sections.begin(); | |
1747 | p != debug_info_sections.end(); | |
1748 | ++p) | |
1749 | { | |
1750 | unsigned int i = *p; | |
1751 | layout->add_to_gdb_index(false, this, symbols_data, symbols_size, | |
1752 | i, reloc_shndx[i], reloc_type[i]); | |
1753 | } | |
1754 | for (std::vector<unsigned int>::const_iterator p | |
1755 | = debug_types_sections.begin(); | |
1756 | p != debug_types_sections.end(); | |
1757 | ++p) | |
1758 | { | |
1759 | unsigned int i = *p; | |
1760 | layout->add_to_gdb_index(true, this, symbols_data, symbols_size, | |
1761 | i, reloc_shndx[i], reloc_type[i]); | |
1762 | } | |
1763 | ||
6d03d481 ST |
1764 | if (is_gc_pass_two) |
1765 | { | |
1766 | delete[] gc_sd->section_headers_data; | |
1767 | delete[] gc_sd->section_names_data; | |
1768 | delete[] gc_sd->symbols_data; | |
1769 | delete[] gc_sd->symbol_names_data; | |
ef15dade | 1770 | this->set_symbols_data(NULL); |
6d03d481 ST |
1771 | } |
1772 | else | |
1773 | { | |
1774 | delete sd->section_headers; | |
1775 | sd->section_headers = NULL; | |
1776 | delete sd->section_names; | |
1777 | sd->section_names = NULL; | |
1778 | } | |
12e14209 ILT |
1779 | } |
1780 | ||
5995b570 CC |
1781 | // Layout sections whose layout was deferred while waiting for |
1782 | // input files from a plugin. | |
1783 | ||
1784 | template<int size, bool big_endian> | |
1785 | void | |
6fa2a40b | 1786 | Sized_relobj_file<size, big_endian>::do_layout_deferred_sections(Layout* layout) |
5995b570 CC |
1787 | { |
1788 | typename std::vector<Deferred_layout>::iterator deferred; | |
1789 | ||
1790 | for (deferred = this->deferred_layout_.begin(); | |
1791 | deferred != this->deferred_layout_.end(); | |
1792 | ++deferred) | |
1793 | { | |
1794 | typename This::Shdr shdr(deferred->shdr_data_); | |
5e0f337e RÁE |
1795 | // If the section is not included, it is because the garbage collector |
1796 | // decided it is not needed. Avoid reverting that decision. | |
1797 | if (!this->is_section_included(deferred->shndx_)) | |
2e702c99 | 1798 | continue; |
5e0f337e | 1799 | |
14788a3f ILT |
1800 | if (parameters->options().relocatable() |
1801 | || deferred->name_ != ".eh_frame" | |
1802 | || !this->check_eh_frame_flags(&shdr)) | |
1803 | this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(), | |
1804 | shdr, deferred->reloc_shndx_, | |
1805 | deferred->reloc_type_); | |
1806 | else | |
1807 | { | |
1808 | // Reading the symbols again here may be slow. | |
1809 | Read_symbols_data sd; | |
1810 | this->read_symbols(&sd); | |
1811 | this->layout_eh_frame_section(layout, | |
1812 | sd.symbols->data(), | |
1813 | sd.symbols_size, | |
1814 | sd.symbol_names->data(), | |
1815 | sd.symbol_names_size, | |
1816 | deferred->shndx_, | |
1817 | shdr, | |
1818 | deferred->reloc_shndx_, | |
1819 | deferred->reloc_type_); | |
1820 | } | |
5995b570 CC |
1821 | } |
1822 | ||
1823 | this->deferred_layout_.clear(); | |
f3a2388f CC |
1824 | |
1825 | // Now handle the deferred relocation sections. | |
1826 | ||
1827 | Output_sections& out_sections(this->output_sections()); | |
6fa2a40b | 1828 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
f3a2388f CC |
1829 | |
1830 | for (deferred = this->deferred_layout_relocs_.begin(); | |
1831 | deferred != this->deferred_layout_relocs_.end(); | |
1832 | ++deferred) | |
1833 | { | |
1834 | unsigned int shndx = deferred->shndx_; | |
1835 | typename This::Shdr shdr(deferred->shdr_data_); | |
1836 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); | |
1837 | ||
1838 | Output_section* data_section = out_sections[data_shndx]; | |
1839 | if (data_section == NULL) | |
1840 | { | |
1841 | out_sections[shndx] = NULL; | |
2e702c99 | 1842 | out_section_offsets[shndx] = invalid_address; |
f3a2388f CC |
1843 | continue; |
1844 | } | |
1845 | ||
1846 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
1847 | this->set_relocatable_relocs(shndx, rr); | |
1848 | ||
1849 | Output_section* os = layout->layout_reloc(this, shndx, shdr, | |
1850 | data_section, rr); | |
1851 | out_sections[shndx] = os; | |
1852 | out_section_offsets[shndx] = invalid_address; | |
1853 | } | |
5995b570 CC |
1854 | } |
1855 | ||
12e14209 ILT |
1856 | // Add the symbols to the symbol table. |
1857 | ||
1858 | template<int size, bool big_endian> | |
1859 | void | |
6fa2a40b CC |
1860 | Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
1861 | Read_symbols_data* sd, | |
1862 | Layout*) | |
12e14209 ILT |
1863 | { |
1864 | if (sd->symbols == NULL) | |
1865 | { | |
a3ad94ed | 1866 | gold_assert(sd->symbol_names == NULL); |
12e14209 ILT |
1867 | return; |
1868 | } | |
a2fb1b05 | 1869 | |
2ea97941 | 1870 | const int sym_size = This::sym_size; |
730cdc88 | 1871 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
2ea97941 ILT |
1872 | / sym_size); |
1873 | if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset) | |
12e14209 | 1874 | { |
75f2446e ILT |
1875 | this->error(_("size of symbols is not multiple of symbol size")); |
1876 | return; | |
a2fb1b05 | 1877 | } |
12e14209 | 1878 | |
730cdc88 | 1879 | this->symbols_.resize(symcount); |
12e14209 | 1880 | |
12e14209 ILT |
1881 | const char* sym_names = |
1882 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
730cdc88 ILT |
1883 | symtab->add_from_relobj(this, |
1884 | sd->symbols->data() + sd->external_symbols_offset, | |
7fcd3aa9 | 1885 | symcount, this->local_symbol_count_, |
d491d34e | 1886 | sym_names, sd->symbol_names_size, |
92de84a6 ILT |
1887 | &this->symbols_, |
1888 | &this->defined_count_); | |
12e14209 ILT |
1889 | |
1890 | delete sd->symbols; | |
1891 | sd->symbols = NULL; | |
1892 | delete sd->symbol_names; | |
1893 | sd->symbol_names = NULL; | |
bae7f79e ILT |
1894 | } |
1895 | ||
b0193076 RÁE |
1896 | // Find out if this object, that is a member of a lib group, should be included |
1897 | // in the link. We check every symbol defined by this object. If the symbol | |
1898 | // table has a strong undefined reference to that symbol, we have to include | |
1899 | // the object. | |
1900 | ||
1901 | template<int size, bool big_endian> | |
1902 | Archive::Should_include | |
6fa2a40b CC |
1903 | Sized_relobj_file<size, big_endian>::do_should_include_member( |
1904 | Symbol_table* symtab, | |
1905 | Layout* layout, | |
1906 | Read_symbols_data* sd, | |
1907 | std::string* why) | |
b0193076 RÁE |
1908 | { |
1909 | char* tmpbuf = NULL; | |
1910 | size_t tmpbuflen = 0; | |
1911 | const char* sym_names = | |
1912 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
1913 | const unsigned char* syms = | |
1914 | sd->symbols->data() + sd->external_symbols_offset; | |
1915 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1916 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) | |
2e702c99 | 1917 | / sym_size); |
b0193076 RÁE |
1918 | |
1919 | const unsigned char* p = syms; | |
1920 | ||
1921 | for (size_t i = 0; i < symcount; ++i, p += sym_size) | |
1922 | { | |
1923 | elfcpp::Sym<size, big_endian> sym(p); | |
1924 | unsigned int st_shndx = sym.get_st_shndx(); | |
1925 | if (st_shndx == elfcpp::SHN_UNDEF) | |
1926 | continue; | |
1927 | ||
1928 | unsigned int st_name = sym.get_st_name(); | |
1929 | const char* name = sym_names + st_name; | |
1930 | Symbol* symbol; | |
88a4108b ILT |
1931 | Archive::Should_include t = Archive::should_include_member(symtab, |
1932 | layout, | |
1933 | name, | |
b0193076 RÁE |
1934 | &symbol, why, |
1935 | &tmpbuf, | |
1936 | &tmpbuflen); | |
1937 | if (t == Archive::SHOULD_INCLUDE_YES) | |
1938 | { | |
1939 | if (tmpbuf != NULL) | |
1940 | free(tmpbuf); | |
1941 | return t; | |
1942 | } | |
1943 | } | |
1944 | if (tmpbuf != NULL) | |
1945 | free(tmpbuf); | |
1946 | return Archive::SHOULD_INCLUDE_UNKNOWN; | |
1947 | } | |
1948 | ||
e0c52780 CC |
1949 | // Iterate over global defined symbols, calling a visitor class V for each. |
1950 | ||
1951 | template<int size, bool big_endian> | |
1952 | void | |
6fa2a40b | 1953 | Sized_relobj_file<size, big_endian>::do_for_all_global_symbols( |
e0c52780 CC |
1954 | Read_symbols_data* sd, |
1955 | Library_base::Symbol_visitor_base* v) | |
1956 | { | |
1957 | const char* sym_names = | |
1958 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
1959 | const unsigned char* syms = | |
1960 | sd->symbols->data() + sd->external_symbols_offset; | |
1961 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1962 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) | |
2e702c99 | 1963 | / sym_size); |
e0c52780 CC |
1964 | const unsigned char* p = syms; |
1965 | ||
1966 | for (size_t i = 0; i < symcount; ++i, p += sym_size) | |
1967 | { | |
1968 | elfcpp::Sym<size, big_endian> sym(p); | |
1969 | if (sym.get_st_shndx() != elfcpp::SHN_UNDEF) | |
1970 | v->visit(sym_names + sym.get_st_name()); | |
1971 | } | |
1972 | } | |
1973 | ||
7223e9ca ILT |
1974 | // Return whether the local symbol SYMNDX has a PLT offset. |
1975 | ||
1976 | template<int size, bool big_endian> | |
1977 | bool | |
6fa2a40b CC |
1978 | Sized_relobj_file<size, big_endian>::local_has_plt_offset( |
1979 | unsigned int symndx) const | |
7223e9ca ILT |
1980 | { |
1981 | typename Local_plt_offsets::const_iterator p = | |
1982 | this->local_plt_offsets_.find(symndx); | |
1983 | return p != this->local_plt_offsets_.end(); | |
1984 | } | |
1985 | ||
1986 | // Get the PLT offset of a local symbol. | |
1987 | ||
1988 | template<int size, bool big_endian> | |
1989 | unsigned int | |
83896202 ILT |
1990 | Sized_relobj_file<size, big_endian>::do_local_plt_offset( |
1991 | unsigned int symndx) const | |
7223e9ca ILT |
1992 | { |
1993 | typename Local_plt_offsets::const_iterator p = | |
1994 | this->local_plt_offsets_.find(symndx); | |
1995 | gold_assert(p != this->local_plt_offsets_.end()); | |
1996 | return p->second; | |
1997 | } | |
1998 | ||
1999 | // Set the PLT offset of a local symbol. | |
2000 | ||
2001 | template<int size, bool big_endian> | |
2002 | void | |
6fa2a40b CC |
2003 | Sized_relobj_file<size, big_endian>::set_local_plt_offset( |
2004 | unsigned int symndx, unsigned int plt_offset) | |
7223e9ca ILT |
2005 | { |
2006 | std::pair<typename Local_plt_offsets::iterator, bool> ins = | |
2007 | this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset)); | |
2008 | gold_assert(ins.second); | |
2009 | } | |
2010 | ||
cb295612 ILT |
2011 | // First pass over the local symbols. Here we add their names to |
2012 | // *POOL and *DYNPOOL, and we store the symbol value in | |
2013 | // THIS->LOCAL_VALUES_. This function is always called from a | |
2014 | // singleton thread. This is followed by a call to | |
2015 | // finalize_local_symbols. | |
75f65a3e ILT |
2016 | |
2017 | template<int size, bool big_endian> | |
7bf1f802 | 2018 | void |
6fa2a40b CC |
2019 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool, |
2020 | Stringpool* dynpool) | |
75f65a3e | 2021 | { |
a3ad94ed | 2022 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 2023 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
2024 | { |
2025 | // This object has no symbols. Weird but legal. | |
7bf1f802 | 2026 | return; |
61ba1cf9 ILT |
2027 | } |
2028 | ||
75f65a3e | 2029 | // Read the symbol table section header. |
2ea97941 | 2030 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 2031 | typename This::Shdr symtabshdr(this, |
2ea97941 | 2032 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 2033 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
75f65a3e ILT |
2034 | |
2035 | // Read the local symbols. | |
2ea97941 | 2036 | const int sym_size = This::sym_size; |
92e059d8 | 2037 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 2038 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 2039 | off_t locsize = loccount * sym_size; |
75f65a3e | 2040 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 2041 | locsize, true, true); |
75f65a3e | 2042 | |
75f65a3e | 2043 | // Read the symbol names. |
d491d34e ILT |
2044 | const unsigned int strtab_shndx = |
2045 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 2046 | section_size_type strtab_size; |
645f8123 | 2047 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 ILT |
2048 | &strtab_size, |
2049 | true); | |
75f65a3e ILT |
2050 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
2051 | ||
2052 | // Loop over the local symbols. | |
2053 | ||
ef9beddf | 2054 | const Output_sections& out_sections(this->output_sections()); |
2ea97941 | 2055 | unsigned int shnum = this->shnum(); |
61ba1cf9 | 2056 | unsigned int count = 0; |
7bf1f802 | 2057 | unsigned int dyncount = 0; |
75f65a3e | 2058 | // Skip the first, dummy, symbol. |
2ea97941 | 2059 | psyms += sym_size; |
403676b5 | 2060 | bool strip_all = parameters->options().strip_all(); |
ebcc8304 | 2061 | bool discard_all = parameters->options().discard_all(); |
bb04269c | 2062 | bool discard_locals = parameters->options().discard_locals(); |
2ea97941 | 2063 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
2064 | { |
2065 | elfcpp::Sym<size, big_endian> sym(psyms); | |
2066 | ||
b8e6aad9 ILT |
2067 | Symbol_value<size>& lv(this->local_values_[i]); |
2068 | ||
d491d34e ILT |
2069 | bool is_ordinary; |
2070 | unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
2071 | &is_ordinary); | |
2072 | lv.set_input_shndx(shndx, is_ordinary); | |
75f65a3e | 2073 | |
063f12a8 ILT |
2074 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
2075 | lv.set_is_section_symbol(); | |
7bf1f802 ILT |
2076 | else if (sym.get_st_type() == elfcpp::STT_TLS) |
2077 | lv.set_is_tls_symbol(); | |
7223e9ca ILT |
2078 | else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC) |
2079 | lv.set_is_ifunc_symbol(); | |
7bf1f802 ILT |
2080 | |
2081 | // Save the input symbol value for use in do_finalize_local_symbols(). | |
2082 | lv.set_input_value(sym.get_st_value()); | |
2083 | ||
2084 | // Decide whether this symbol should go into the output file. | |
063f12a8 | 2085 | |
2ea97941 | 2086 | if ((shndx < shnum && out_sections[shndx] == NULL) |
ebcc8304 | 2087 | || shndx == this->discarded_eh_frame_shndx_) |
2e702c99 | 2088 | { |
7bf1f802 | 2089 | lv.set_no_output_symtab_entry(); |
2e702c99 RM |
2090 | gold_assert(!lv.needs_output_dynsym_entry()); |
2091 | continue; | |
2092 | } | |
7bf1f802 ILT |
2093 | |
2094 | if (sym.get_st_type() == elfcpp::STT_SECTION) | |
2095 | { | |
2096 | lv.set_no_output_symtab_entry(); | |
2e702c99 | 2097 | gold_assert(!lv.needs_output_dynsym_entry()); |
7bf1f802 ILT |
2098 | continue; |
2099 | } | |
2100 | ||
2101 | if (sym.get_st_name() >= strtab_size) | |
2102 | { | |
2103 | this->error(_("local symbol %u section name out of range: %u >= %u"), | |
2104 | i, sym.get_st_name(), | |
2105 | static_cast<unsigned int>(strtab_size)); | |
2106 | lv.set_no_output_symtab_entry(); | |
2107 | continue; | |
2108 | } | |
2109 | ||
ebcc8304 ILT |
2110 | const char* name = pnames + sym.get_st_name(); |
2111 | ||
2112 | // If needed, add the symbol to the dynamic symbol table string pool. | |
2113 | if (lv.needs_output_dynsym_entry()) | |
2e702c99 RM |
2114 | { |
2115 | dynpool->add(name, true, NULL); | |
2116 | ++dyncount; | |
2117 | } | |
ebcc8304 | 2118 | |
403676b5 CC |
2119 | if (strip_all |
2120 | || (discard_all && lv.may_be_discarded_from_output_symtab())) | |
ebcc8304 ILT |
2121 | { |
2122 | lv.set_no_output_symtab_entry(); | |
2123 | continue; | |
2124 | } | |
2125 | ||
bb04269c DK |
2126 | // If --discard-locals option is used, discard all temporary local |
2127 | // symbols. These symbols start with system-specific local label | |
2128 | // prefixes, typically .L for ELF system. We want to be compatible | |
2129 | // with GNU ld so here we essentially use the same check in | |
2130 | // bfd_is_local_label(). The code is different because we already | |
2131 | // know that: | |
2132 | // | |
2133 | // - the symbol is local and thus cannot have global or weak binding. | |
2134 | // - the symbol is not a section symbol. | |
2135 | // - the symbol has a name. | |
2136 | // | |
2137 | // We do not discard a symbol if it needs a dynamic symbol entry. | |
bb04269c DK |
2138 | if (discard_locals |
2139 | && sym.get_st_type() != elfcpp::STT_FILE | |
2140 | && !lv.needs_output_dynsym_entry() | |
d3bbad62 | 2141 | && lv.may_be_discarded_from_output_symtab() |
2ea97941 | 2142 | && parameters->target().is_local_label_name(name)) |
bb04269c DK |
2143 | { |
2144 | lv.set_no_output_symtab_entry(); | |
2145 | continue; | |
2146 | } | |
2147 | ||
8c604651 CS |
2148 | // Discard the local symbol if -retain_symbols_file is specified |
2149 | // and the local symbol is not in that file. | |
2ea97941 | 2150 | if (!parameters->options().should_retain_symbol(name)) |
2e702c99 RM |
2151 | { |
2152 | lv.set_no_output_symtab_entry(); | |
2153 | continue; | |
2154 | } | |
8c604651 | 2155 | |
bb04269c | 2156 | // Add the symbol to the symbol table string pool. |
2ea97941 | 2157 | pool->add(name, true, NULL); |
7bf1f802 | 2158 | ++count; |
7bf1f802 ILT |
2159 | } |
2160 | ||
2161 | this->output_local_symbol_count_ = count; | |
2162 | this->output_local_dynsym_count_ = dyncount; | |
2163 | } | |
2164 | ||
aa98ff75 DK |
2165 | // Compute the final value of a local symbol. |
2166 | ||
2167 | template<int size, bool big_endian> | |
6fa2a40b CC |
2168 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
2169 | Sized_relobj_file<size, big_endian>::compute_final_local_value_internal( | |
aa98ff75 DK |
2170 | unsigned int r_sym, |
2171 | const Symbol_value<size>* lv_in, | |
2172 | Symbol_value<size>* lv_out, | |
2173 | bool relocatable, | |
2174 | const Output_sections& out_sections, | |
2175 | const std::vector<Address>& out_offsets, | |
2176 | const Symbol_table* symtab) | |
2177 | { | |
2178 | // We are going to overwrite *LV_OUT, if it has a merged symbol value, | |
2179 | // we may have a memory leak. | |
2180 | gold_assert(lv_out->has_output_value()); | |
2181 | ||
2182 | bool is_ordinary; | |
2183 | unsigned int shndx = lv_in->input_shndx(&is_ordinary); | |
2e702c99 | 2184 | |
aa98ff75 | 2185 | // Set the output symbol value. |
2e702c99 | 2186 | |
aa98ff75 DK |
2187 | if (!is_ordinary) |
2188 | { | |
2189 | if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx)) | |
2190 | lv_out->set_output_value(lv_in->input_value()); | |
2191 | else | |
2192 | { | |
2193 | this->error(_("unknown section index %u for local symbol %u"), | |
2194 | shndx, r_sym); | |
2195 | lv_out->set_output_value(0); | |
2196 | return This::CFLV_ERROR; | |
2197 | } | |
2198 | } | |
2199 | else | |
2200 | { | |
2201 | if (shndx >= this->shnum()) | |
2202 | { | |
2203 | this->error(_("local symbol %u section index %u out of range"), | |
2204 | r_sym, shndx); | |
2205 | lv_out->set_output_value(0); | |
2206 | return This::CFLV_ERROR; | |
2207 | } | |
2e702c99 | 2208 | |
aa98ff75 DK |
2209 | Output_section* os = out_sections[shndx]; |
2210 | Address secoffset = out_offsets[shndx]; | |
2211 | if (symtab->is_section_folded(this, shndx)) | |
2212 | { | |
2213 | gold_assert(os == NULL && secoffset == invalid_address); | |
2214 | // Get the os of the section it is folded onto. | |
2215 | Section_id folded = symtab->icf()->get_folded_section(this, | |
2216 | shndx); | |
2217 | gold_assert(folded.first != NULL); | |
6fa2a40b CC |
2218 | Sized_relobj_file<size, big_endian>* folded_obj = reinterpret_cast |
2219 | <Sized_relobj_file<size, big_endian>*>(folded.first); | |
aa98ff75 DK |
2220 | os = folded_obj->output_section(folded.second); |
2221 | gold_assert(os != NULL); | |
2222 | secoffset = folded_obj->get_output_section_offset(folded.second); | |
2e702c99 | 2223 | |
aa98ff75 DK |
2224 | // This could be a relaxed input section. |
2225 | if (secoffset == invalid_address) | |
2226 | { | |
2227 | const Output_relaxed_input_section* relaxed_section = | |
2228 | os->find_relaxed_input_section(folded_obj, folded.second); | |
2229 | gold_assert(relaxed_section != NULL); | |
2230 | secoffset = relaxed_section->address() - os->address(); | |
2231 | } | |
2232 | } | |
2e702c99 | 2233 | |
aa98ff75 DK |
2234 | if (os == NULL) |
2235 | { | |
2236 | // This local symbol belongs to a section we are discarding. | |
2237 | // In some cases when applying relocations later, we will | |
2238 | // attempt to match it to the corresponding kept section, | |
2239 | // so we leave the input value unchanged here. | |
2240 | return This::CFLV_DISCARDED; | |
2241 | } | |
2242 | else if (secoffset == invalid_address) | |
2243 | { | |
2244 | uint64_t start; | |
2e702c99 | 2245 | |
aa98ff75 DK |
2246 | // This is a SHF_MERGE section or one which otherwise |
2247 | // requires special handling. | |
2248 | if (shndx == this->discarded_eh_frame_shndx_) | |
2249 | { | |
2250 | // This local symbol belongs to a discarded .eh_frame | |
2251 | // section. Just treat it like the case in which | |
2252 | // os == NULL above. | |
2253 | gold_assert(this->has_eh_frame_); | |
2254 | return This::CFLV_DISCARDED; | |
2255 | } | |
2256 | else if (!lv_in->is_section_symbol()) | |
2257 | { | |
2258 | // This is not a section symbol. We can determine | |
2259 | // the final value now. | |
2260 | lv_out->set_output_value( | |
2261 | os->output_address(this, shndx, lv_in->input_value())); | |
2262 | } | |
2263 | else if (!os->find_starting_output_address(this, shndx, &start)) | |
2264 | { | |
2265 | // This is a section symbol, but apparently not one in a | |
2266 | // merged section. First check to see if this is a relaxed | |
2267 | // input section. If so, use its address. Otherwise just | |
2268 | // use the start of the output section. This happens with | |
2269 | // relocatable links when the input object has section | |
2270 | // symbols for arbitrary non-merge sections. | |
2271 | const Output_section_data* posd = | |
2272 | os->find_relaxed_input_section(this, shndx); | |
2273 | if (posd != NULL) | |
2274 | { | |
2275 | Address relocatable_link_adjustment = | |
2276 | relocatable ? os->address() : 0; | |
2277 | lv_out->set_output_value(posd->address() | |
2278 | - relocatable_link_adjustment); | |
2279 | } | |
2280 | else | |
2281 | lv_out->set_output_value(os->address()); | |
2282 | } | |
2283 | else | |
2284 | { | |
2285 | // We have to consider the addend to determine the | |
2286 | // value to use in a relocation. START is the start | |
2287 | // of this input section. If we are doing a relocatable | |
2288 | // link, use offset from start output section instead of | |
2289 | // address. | |
2290 | Address adjusted_start = | |
2291 | relocatable ? start - os->address() : start; | |
2292 | Merged_symbol_value<size>* msv = | |
2293 | new Merged_symbol_value<size>(lv_in->input_value(), | |
2294 | adjusted_start); | |
2295 | lv_out->set_merged_symbol_value(msv); | |
2296 | } | |
2297 | } | |
2298 | else if (lv_in->is_tls_symbol()) | |
2299 | lv_out->set_output_value(os->tls_offset() | |
2300 | + secoffset | |
2301 | + lv_in->input_value()); | |
2302 | else | |
2303 | lv_out->set_output_value((relocatable ? 0 : os->address()) | |
2304 | + secoffset | |
2305 | + lv_in->input_value()); | |
2306 | } | |
2307 | return This::CFLV_OK; | |
2308 | } | |
2309 | ||
2310 | // Compute final local symbol value. R_SYM is the index of a local | |
2311 | // symbol in symbol table. LV points to a symbol value, which is | |
2312 | // expected to hold the input value and to be over-written by the | |
2313 | // final value. SYMTAB points to a symbol table. Some targets may want | |
2314 | // to know would-be-finalized local symbol values in relaxation. | |
2315 | // Hence we provide this method. Since this method updates *LV, a | |
2316 | // callee should make a copy of the original local symbol value and | |
2317 | // use the copy instead of modifying an object's local symbols before | |
2318 | // everything is finalized. The caller should also free up any allocated | |
2319 | // memory in the return value in *LV. | |
2320 | template<int size, bool big_endian> | |
6fa2a40b CC |
2321 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
2322 | Sized_relobj_file<size, big_endian>::compute_final_local_value( | |
aa98ff75 DK |
2323 | unsigned int r_sym, |
2324 | const Symbol_value<size>* lv_in, | |
2325 | Symbol_value<size>* lv_out, | |
2326 | const Symbol_table* symtab) | |
2327 | { | |
2328 | // This is just a wrapper of compute_final_local_value_internal. | |
2329 | const bool relocatable = parameters->options().relocatable(); | |
2330 | const Output_sections& out_sections(this->output_sections()); | |
6fa2a40b | 2331 | const std::vector<Address>& out_offsets(this->section_offsets()); |
aa98ff75 DK |
2332 | return this->compute_final_local_value_internal(r_sym, lv_in, lv_out, |
2333 | relocatable, out_sections, | |
2334 | out_offsets, symtab); | |
2335 | } | |
2336 | ||
cb295612 | 2337 | // Finalize the local symbols. Here we set the final value in |
7bf1f802 | 2338 | // THIS->LOCAL_VALUES_ and set their output symbol table indexes. |
17a1d0a9 | 2339 | // This function is always called from a singleton thread. The actual |
7bf1f802 ILT |
2340 | // output of the local symbols will occur in a separate task. |
2341 | ||
2342 | template<int size, bool big_endian> | |
2343 | unsigned int | |
6fa2a40b CC |
2344 | Sized_relobj_file<size, big_endian>::do_finalize_local_symbols( |
2345 | unsigned int index, | |
2346 | off_t off, | |
2347 | Symbol_table* symtab) | |
7bf1f802 ILT |
2348 | { |
2349 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
2350 | ||
2351 | const unsigned int loccount = this->local_symbol_count_; | |
2352 | this->local_symbol_offset_ = off; | |
2353 | ||
b4ecf66b | 2354 | const bool relocatable = parameters->options().relocatable(); |
ef9beddf | 2355 | const Output_sections& out_sections(this->output_sections()); |
6fa2a40b | 2356 | const std::vector<Address>& out_offsets(this->section_offsets()); |
7bf1f802 ILT |
2357 | |
2358 | for (unsigned int i = 1; i < loccount; ++i) | |
2359 | { | |
aa98ff75 | 2360 | Symbol_value<size>* lv = &this->local_values_[i]; |
7bf1f802 | 2361 | |
6695e4b3 | 2362 | Compute_final_local_value_status cflv_status = |
aa98ff75 DK |
2363 | this->compute_final_local_value_internal(i, lv, lv, relocatable, |
2364 | out_sections, out_offsets, | |
2365 | symtab); | |
2366 | switch (cflv_status) | |
75f65a3e | 2367 | { |
aa98ff75 DK |
2368 | case CFLV_OK: |
2369 | if (!lv->is_output_symtab_index_set()) | |
75f65a3e | 2370 | { |
aa98ff75 DK |
2371 | lv->set_output_symtab_index(index); |
2372 | ++index; | |
75f65a3e | 2373 | } |
aa98ff75 DK |
2374 | break; |
2375 | case CFLV_DISCARDED: | |
2376 | case CFLV_ERROR: | |
2377 | // Do nothing. | |
2378 | break; | |
2379 | default: | |
2380 | gold_unreachable(); | |
75f65a3e | 2381 | } |
7bf1f802 ILT |
2382 | } |
2383 | return index; | |
2384 | } | |
645f8123 | 2385 | |
7bf1f802 | 2386 | // Set the output dynamic symbol table indexes for the local variables. |
c06b7b0b | 2387 | |
7bf1f802 ILT |
2388 | template<int size, bool big_endian> |
2389 | unsigned int | |
6fa2a40b CC |
2390 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_indexes( |
2391 | unsigned int index) | |
7bf1f802 ILT |
2392 | { |
2393 | const unsigned int loccount = this->local_symbol_count_; | |
2394 | for (unsigned int i = 1; i < loccount; ++i) | |
2395 | { | |
2396 | Symbol_value<size>& lv(this->local_values_[i]); | |
2397 | if (lv.needs_output_dynsym_entry()) | |
2e702c99 RM |
2398 | { |
2399 | lv.set_output_dynsym_index(index); | |
2400 | ++index; | |
2401 | } | |
75f65a3e | 2402 | } |
7bf1f802 ILT |
2403 | return index; |
2404 | } | |
75f65a3e | 2405 | |
7bf1f802 ILT |
2406 | // Set the offset where local dynamic symbol information will be stored. |
2407 | // Returns the count of local symbols contributed to the symbol table by | |
2408 | // this object. | |
61ba1cf9 | 2409 | |
7bf1f802 ILT |
2410 | template<int size, bool big_endian> |
2411 | unsigned int | |
6fa2a40b | 2412 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_offset(off_t off) |
7bf1f802 ILT |
2413 | { |
2414 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
2415 | this->local_dynsym_offset_ = off; | |
2416 | return this->output_local_dynsym_count_; | |
75f65a3e ILT |
2417 | } |
2418 | ||
ef15dade ST |
2419 | // If Symbols_data is not NULL get the section flags from here otherwise |
2420 | // get it from the file. | |
2421 | ||
2422 | template<int size, bool big_endian> | |
2423 | uint64_t | |
6fa2a40b | 2424 | Sized_relobj_file<size, big_endian>::do_section_flags(unsigned int shndx) |
ef15dade ST |
2425 | { |
2426 | Symbols_data* sd = this->get_symbols_data(); | |
2427 | if (sd != NULL) | |
2428 | { | |
2429 | const unsigned char* pshdrs = sd->section_headers_data | |
2e702c99 | 2430 | + This::shdr_size * shndx; |
ef15dade | 2431 | typename This::Shdr shdr(pshdrs); |
2e702c99 | 2432 | return shdr.get_sh_flags(); |
ef15dade ST |
2433 | } |
2434 | // If sd is NULL, read the section header from the file. | |
2e702c99 | 2435 | return this->elf_file_.section_flags(shndx); |
ef15dade ST |
2436 | } |
2437 | ||
2438 | // Get the section's ent size from Symbols_data. Called by get_section_contents | |
2439 | // in icf.cc | |
2440 | ||
2441 | template<int size, bool big_endian> | |
2442 | uint64_t | |
6fa2a40b | 2443 | Sized_relobj_file<size, big_endian>::do_section_entsize(unsigned int shndx) |
ef15dade ST |
2444 | { |
2445 | Symbols_data* sd = this->get_symbols_data(); | |
ca09d69a | 2446 | gold_assert(sd != NULL); |
ef15dade ST |
2447 | |
2448 | const unsigned char* pshdrs = sd->section_headers_data | |
2e702c99 | 2449 | + This::shdr_size * shndx; |
ef15dade | 2450 | typename This::Shdr shdr(pshdrs); |
2e702c99 | 2451 | return shdr.get_sh_entsize(); |
ef15dade ST |
2452 | } |
2453 | ||
61ba1cf9 ILT |
2454 | // Write out the local symbols. |
2455 | ||
2456 | template<int size, bool big_endian> | |
2457 | void | |
6fa2a40b | 2458 | Sized_relobj_file<size, big_endian>::write_local_symbols( |
17a1d0a9 ILT |
2459 | Output_file* of, |
2460 | const Stringpool* sympool, | |
d491d34e ILT |
2461 | const Stringpool* dynpool, |
2462 | Output_symtab_xindex* symtab_xindex, | |
cdc29364 CC |
2463 | Output_symtab_xindex* dynsym_xindex, |
2464 | off_t symtab_off) | |
61ba1cf9 | 2465 | { |
99e9a495 ILT |
2466 | const bool strip_all = parameters->options().strip_all(); |
2467 | if (strip_all) | |
2468 | { | |
2469 | if (this->output_local_dynsym_count_ == 0) | |
2470 | return; | |
2471 | this->output_local_symbol_count_ = 0; | |
2472 | } | |
9e2dcb77 | 2473 | |
a3ad94ed | 2474 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 2475 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
2476 | { |
2477 | // This object has no symbols. Weird but legal. | |
2478 | return; | |
2479 | } | |
2480 | ||
2481 | // Read the symbol table section header. | |
2ea97941 | 2482 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 2483 | typename This::Shdr symtabshdr(this, |
2ea97941 | 2484 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 2485 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 | 2486 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 2487 | gold_assert(loccount == symtabshdr.get_sh_info()); |
61ba1cf9 ILT |
2488 | |
2489 | // Read the local symbols. | |
2ea97941 ILT |
2490 | const int sym_size = This::sym_size; |
2491 | off_t locsize = loccount * sym_size; | |
61ba1cf9 | 2492 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 2493 | locsize, true, false); |
61ba1cf9 | 2494 | |
61ba1cf9 | 2495 | // Read the symbol names. |
d491d34e ILT |
2496 | const unsigned int strtab_shndx = |
2497 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 2498 | section_size_type strtab_size; |
645f8123 | 2499 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 | 2500 | &strtab_size, |
cb295612 | 2501 | false); |
61ba1cf9 ILT |
2502 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
2503 | ||
7bf1f802 ILT |
2504 | // Get views into the output file for the portions of the symbol table |
2505 | // and the dynamic symbol table that we will be writing. | |
2ea97941 | 2506 | off_t output_size = this->output_local_symbol_count_ * sym_size; |
f2619d6c | 2507 | unsigned char* oview = NULL; |
7bf1f802 | 2508 | if (output_size > 0) |
cdc29364 CC |
2509 | oview = of->get_output_view(symtab_off + this->local_symbol_offset_, |
2510 | output_size); | |
7bf1f802 | 2511 | |
2ea97941 | 2512 | off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size; |
7bf1f802 ILT |
2513 | unsigned char* dyn_oview = NULL; |
2514 | if (dyn_output_size > 0) | |
2515 | dyn_oview = of->get_output_view(this->local_dynsym_offset_, | |
2e702c99 | 2516 | dyn_output_size); |
61ba1cf9 | 2517 | |
ef9beddf | 2518 | const Output_sections out_sections(this->output_sections()); |
c06b7b0b | 2519 | |
a3ad94ed | 2520 | gold_assert(this->local_values_.size() == loccount); |
61ba1cf9 | 2521 | |
61ba1cf9 | 2522 | unsigned char* ov = oview; |
7bf1f802 | 2523 | unsigned char* dyn_ov = dyn_oview; |
2ea97941 ILT |
2524 | psyms += sym_size; |
2525 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) | |
61ba1cf9 ILT |
2526 | { |
2527 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 | 2528 | |
d491d34e ILT |
2529 | Symbol_value<size>& lv(this->local_values_[i]); |
2530 | ||
2531 | bool is_ordinary; | |
2532 | unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(), | |
2533 | &is_ordinary); | |
2534 | if (is_ordinary) | |
61ba1cf9 | 2535 | { |
ef9beddf ILT |
2536 | gold_assert(st_shndx < out_sections.size()); |
2537 | if (out_sections[st_shndx] == NULL) | |
61ba1cf9 | 2538 | continue; |
ef9beddf | 2539 | st_shndx = out_sections[st_shndx]->out_shndx(); |
d491d34e ILT |
2540 | if (st_shndx >= elfcpp::SHN_LORESERVE) |
2541 | { | |
d3bbad62 | 2542 | if (lv.has_output_symtab_entry()) |
d491d34e | 2543 | symtab_xindex->add(lv.output_symtab_index(), st_shndx); |
d3bbad62 | 2544 | if (lv.has_output_dynsym_entry()) |
d491d34e ILT |
2545 | dynsym_xindex->add(lv.output_dynsym_index(), st_shndx); |
2546 | st_shndx = elfcpp::SHN_XINDEX; | |
2547 | } | |
61ba1cf9 ILT |
2548 | } |
2549 | ||
7bf1f802 | 2550 | // Write the symbol to the output symbol table. |
d3bbad62 | 2551 | if (lv.has_output_symtab_entry()) |
2e702c99 RM |
2552 | { |
2553 | elfcpp::Sym_write<size, big_endian> osym(ov); | |
2554 | ||
2555 | gold_assert(isym.get_st_name() < strtab_size); | |
2556 | const char* name = pnames + isym.get_st_name(); | |
2557 | osym.put_st_name(sympool->get_offset(name)); | |
2558 | osym.put_st_value(this->local_values_[i].value(this, 0)); | |
2559 | osym.put_st_size(isym.get_st_size()); | |
2560 | osym.put_st_info(isym.get_st_info()); | |
2561 | osym.put_st_other(isym.get_st_other()); | |
2562 | osym.put_st_shndx(st_shndx); | |
2563 | ||
2564 | ov += sym_size; | |
2565 | } | |
7bf1f802 ILT |
2566 | |
2567 | // Write the symbol to the output dynamic symbol table. | |
d3bbad62 | 2568 | if (lv.has_output_dynsym_entry()) |
2e702c99 RM |
2569 | { |
2570 | gold_assert(dyn_ov < dyn_oview + dyn_output_size); | |
2571 | elfcpp::Sym_write<size, big_endian> osym(dyn_ov); | |
2572 | ||
2573 | gold_assert(isym.get_st_name() < strtab_size); | |
2574 | const char* name = pnames + isym.get_st_name(); | |
2575 | osym.put_st_name(dynpool->get_offset(name)); | |
2576 | osym.put_st_value(this->local_values_[i].value(this, 0)); | |
2577 | osym.put_st_size(isym.get_st_size()); | |
2578 | osym.put_st_info(isym.get_st_info()); | |
2579 | osym.put_st_other(isym.get_st_other()); | |
2580 | osym.put_st_shndx(st_shndx); | |
2581 | ||
2582 | dyn_ov += sym_size; | |
2583 | } | |
7bf1f802 | 2584 | } |
f6ce93d6 | 2585 | |
61ba1cf9 | 2586 | |
7bf1f802 ILT |
2587 | if (output_size > 0) |
2588 | { | |
2589 | gold_assert(ov - oview == output_size); | |
cdc29364 CC |
2590 | of->write_output_view(symtab_off + this->local_symbol_offset_, |
2591 | output_size, oview); | |
61ba1cf9 ILT |
2592 | } |
2593 | ||
7bf1f802 ILT |
2594 | if (dyn_output_size > 0) |
2595 | { | |
2596 | gold_assert(dyn_ov - dyn_oview == dyn_output_size); | |
2597 | of->write_output_view(this->local_dynsym_offset_, dyn_output_size, | |
2e702c99 | 2598 | dyn_oview); |
7bf1f802 | 2599 | } |
61ba1cf9 ILT |
2600 | } |
2601 | ||
f7e2ee48 ILT |
2602 | // Set *INFO to symbolic information about the offset OFFSET in the |
2603 | // section SHNDX. Return true if we found something, false if we | |
2604 | // found nothing. | |
2605 | ||
2606 | template<int size, bool big_endian> | |
2607 | bool | |
6fa2a40b | 2608 | Sized_relobj_file<size, big_endian>::get_symbol_location_info( |
f7e2ee48 | 2609 | unsigned int shndx, |
2ea97941 | 2610 | off_t offset, |
f7e2ee48 ILT |
2611 | Symbol_location_info* info) |
2612 | { | |
2613 | if (this->symtab_shndx_ == 0) | |
2614 | return false; | |
2615 | ||
8383303e | 2616 | section_size_type symbols_size; |
f7e2ee48 ILT |
2617 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
2618 | &symbols_size, | |
2619 | false); | |
2620 | ||
d491d34e ILT |
2621 | unsigned int symbol_names_shndx = |
2622 | this->adjust_shndx(this->section_link(this->symtab_shndx_)); | |
8383303e | 2623 | section_size_type names_size; |
f7e2ee48 ILT |
2624 | const unsigned char* symbol_names_u = |
2625 | this->section_contents(symbol_names_shndx, &names_size, false); | |
2626 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
2627 | ||
2ea97941 ILT |
2628 | const int sym_size = This::sym_size; |
2629 | const size_t count = symbols_size / sym_size; | |
f7e2ee48 ILT |
2630 | |
2631 | const unsigned char* p = symbols; | |
2ea97941 | 2632 | for (size_t i = 0; i < count; ++i, p += sym_size) |
f7e2ee48 ILT |
2633 | { |
2634 | elfcpp::Sym<size, big_endian> sym(p); | |
2635 | ||
2636 | if (sym.get_st_type() == elfcpp::STT_FILE) | |
2637 | { | |
2638 | if (sym.get_st_name() >= names_size) | |
2639 | info->source_file = "(invalid)"; | |
2640 | else | |
2641 | info->source_file = symbol_names + sym.get_st_name(); | |
d491d34e | 2642 | continue; |
f7e2ee48 | 2643 | } |
d491d34e ILT |
2644 | |
2645 | bool is_ordinary; | |
2646 | unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
2647 | &is_ordinary); | |
2648 | if (is_ordinary | |
2649 | && st_shndx == shndx | |
2ea97941 | 2650 | && static_cast<off_t>(sym.get_st_value()) <= offset |
d491d34e | 2651 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) |
2ea97941 | 2652 | > offset)) |
2e702c99 RM |
2653 | { |
2654 | if (sym.get_st_name() > names_size) | |
f7e2ee48 ILT |
2655 | info->enclosing_symbol_name = "(invalid)"; |
2656 | else | |
2e702c99 RM |
2657 | { |
2658 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); | |
2659 | if (parameters->options().do_demangle()) | |
2660 | { | |
2661 | char* demangled_name = cplus_demangle( | |
2662 | info->enclosing_symbol_name.c_str(), | |
2663 | DMGL_ANSI | DMGL_PARAMS); | |
2664 | if (demangled_name != NULL) | |
2665 | { | |
2666 | info->enclosing_symbol_name.assign(demangled_name); | |
2667 | free(demangled_name); | |
2668 | } | |
2669 | } | |
2670 | } | |
f7e2ee48 | 2671 | return true; |
2e702c99 | 2672 | } |
f7e2ee48 ILT |
2673 | } |
2674 | ||
2675 | return false; | |
2676 | } | |
2677 | ||
e94cf127 CC |
2678 | // Look for a kept section corresponding to the given discarded section, |
2679 | // and return its output address. This is used only for relocations in | |
2680 | // debugging sections. If we can't find the kept section, return 0. | |
2681 | ||
2682 | template<int size, bool big_endian> | |
6fa2a40b CC |
2683 | typename Sized_relobj_file<size, big_endian>::Address |
2684 | Sized_relobj_file<size, big_endian>::map_to_kept_section( | |
e94cf127 CC |
2685 | unsigned int shndx, |
2686 | bool* found) const | |
2687 | { | |
1ef4d87f ILT |
2688 | Relobj* kept_object; |
2689 | unsigned int kept_shndx; | |
2690 | if (this->get_kept_comdat_section(shndx, &kept_object, &kept_shndx)) | |
e94cf127 | 2691 | { |
6fa2a40b CC |
2692 | Sized_relobj_file<size, big_endian>* kept_relobj = |
2693 | static_cast<Sized_relobj_file<size, big_endian>*>(kept_object); | |
1ef4d87f | 2694 | Output_section* os = kept_relobj->output_section(kept_shndx); |
2ea97941 ILT |
2695 | Address offset = kept_relobj->get_output_section_offset(kept_shndx); |
2696 | if (os != NULL && offset != invalid_address) | |
1ef4d87f ILT |
2697 | { |
2698 | *found = true; | |
2ea97941 | 2699 | return os->address() + offset; |
1ef4d87f | 2700 | } |
e94cf127 CC |
2701 | } |
2702 | *found = false; | |
2703 | return 0; | |
2704 | } | |
2705 | ||
92de84a6 ILT |
2706 | // Get symbol counts. |
2707 | ||
2708 | template<int size, bool big_endian> | |
2709 | void | |
6fa2a40b | 2710 | Sized_relobj_file<size, big_endian>::do_get_global_symbol_counts( |
92de84a6 ILT |
2711 | const Symbol_table*, |
2712 | size_t* defined, | |
2713 | size_t* used) const | |
2714 | { | |
2715 | *defined = this->defined_count_; | |
2716 | size_t count = 0; | |
cdc29364 | 2717 | for (typename Symbols::const_iterator p = this->symbols_.begin(); |
92de84a6 ILT |
2718 | p != this->symbols_.end(); |
2719 | ++p) | |
2720 | if (*p != NULL | |
2721 | && (*p)->source() == Symbol::FROM_OBJECT | |
2722 | && (*p)->object() == this | |
2723 | && (*p)->is_defined()) | |
2724 | ++count; | |
2725 | *used = count; | |
2726 | } | |
2727 | ||
5dd8762a CC |
2728 | // Return a view of the decompressed contents of a section. Set *PLEN |
2729 | // to the size. Set *IS_NEW to true if the contents need to be freed | |
2730 | // by the caller. | |
2731 | ||
2732 | template<int size, bool big_endian> | |
2733 | const unsigned char* | |
2734 | Sized_relobj_file<size, big_endian>::do_decompressed_section_contents( | |
2735 | unsigned int shndx, | |
2736 | section_size_type* plen, | |
2737 | bool* is_new) | |
2738 | { | |
2739 | section_size_type buffer_size; | |
c1027032 CC |
2740 | const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size, |
2741 | false); | |
5dd8762a CC |
2742 | |
2743 | if (this->compressed_sections_ == NULL) | |
2744 | { | |
2745 | *plen = buffer_size; | |
2746 | *is_new = false; | |
2747 | return buffer; | |
2748 | } | |
2749 | ||
2750 | Compressed_section_map::const_iterator p = | |
2751 | this->compressed_sections_->find(shndx); | |
2752 | if (p == this->compressed_sections_->end()) | |
2753 | { | |
2754 | *plen = buffer_size; | |
2755 | *is_new = false; | |
2756 | return buffer; | |
2757 | } | |
2758 | ||
2759 | section_size_type uncompressed_size = p->second.size; | |
2760 | if (p->second.contents != NULL) | |
2761 | { | |
2762 | *plen = uncompressed_size; | |
2763 | *is_new = false; | |
2764 | return p->second.contents; | |
2765 | } | |
2766 | ||
2767 | unsigned char* uncompressed_data = new unsigned char[uncompressed_size]; | |
2768 | if (!decompress_input_section(buffer, | |
2769 | buffer_size, | |
2770 | uncompressed_data, | |
2771 | uncompressed_size)) | |
2772 | this->error(_("could not decompress section %s"), | |
2773 | this->do_section_name(shndx).c_str()); | |
2774 | ||
2775 | // We could cache the results in p->second.contents and store | |
2776 | // false in *IS_NEW, but build_compressed_section_map() would | |
2777 | // have done so if it had expected it to be profitable. If | |
2778 | // we reach this point, we expect to need the contents only | |
2779 | // once in this pass. | |
2780 | *plen = uncompressed_size; | |
2781 | *is_new = true; | |
2782 | return uncompressed_data; | |
2783 | } | |
2784 | ||
2785 | // Discard any buffers of uncompressed sections. This is done | |
2786 | // at the end of the Add_symbols task. | |
2787 | ||
2788 | template<int size, bool big_endian> | |
2789 | void | |
2790 | Sized_relobj_file<size, big_endian>::do_discard_decompressed_sections() | |
2791 | { | |
2792 | if (this->compressed_sections_ == NULL) | |
2793 | return; | |
2794 | ||
2795 | for (Compressed_section_map::iterator p = this->compressed_sections_->begin(); | |
2796 | p != this->compressed_sections_->end(); | |
2797 | ++p) | |
2798 | { | |
2799 | if (p->second.contents != NULL) | |
2e702c99 RM |
2800 | { |
2801 | delete[] p->second.contents; | |
2802 | p->second.contents = NULL; | |
2803 | } | |
5dd8762a CC |
2804 | } |
2805 | } | |
2806 | ||
54dc6425 ILT |
2807 | // Input_objects methods. |
2808 | ||
008db82e ILT |
2809 | // Add a regular relocatable object to the list. Return false if this |
2810 | // object should be ignored. | |
f6ce93d6 | 2811 | |
008db82e | 2812 | bool |
54dc6425 ILT |
2813 | Input_objects::add_object(Object* obj) |
2814 | { | |
c5818ff1 CC |
2815 | // Print the filename if the -t/--trace option is selected. |
2816 | if (parameters->options().trace()) | |
2817 | gold_info("%s", obj->name().c_str()); | |
2818 | ||
008db82e | 2819 | if (!obj->is_dynamic()) |
f6ce93d6 | 2820 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
008db82e ILT |
2821 | else |
2822 | { | |
2823 | // See if this is a duplicate SONAME. | |
2824 | Dynobj* dynobj = static_cast<Dynobj*>(obj); | |
9a2d6984 | 2825 | const char* soname = dynobj->soname(); |
008db82e ILT |
2826 | |
2827 | std::pair<Unordered_set<std::string>::iterator, bool> ins = | |
9a2d6984 | 2828 | this->sonames_.insert(soname); |
008db82e ILT |
2829 | if (!ins.second) |
2830 | { | |
2831 | // We have already seen a dynamic object with this soname. | |
2832 | return false; | |
2833 | } | |
2834 | ||
2835 | this->dynobj_list_.push_back(dynobj); | |
2836 | } | |
75f65a3e | 2837 | |
92de84a6 | 2838 | // Add this object to the cross-referencer if requested. |
dde3f402 ILT |
2839 | if (parameters->options().user_set_print_symbol_counts() |
2840 | || parameters->options().cref()) | |
92de84a6 ILT |
2841 | { |
2842 | if (this->cref_ == NULL) | |
2843 | this->cref_ = new Cref(); | |
2844 | this->cref_->add_object(obj); | |
2845 | } | |
2846 | ||
008db82e | 2847 | return true; |
54dc6425 ILT |
2848 | } |
2849 | ||
e2827e5f ILT |
2850 | // For each dynamic object, record whether we've seen all of its |
2851 | // explicit dependencies. | |
2852 | ||
2853 | void | |
2854 | Input_objects::check_dynamic_dependencies() const | |
2855 | { | |
7eaea549 | 2856 | bool issued_copy_dt_needed_error = false; |
e2827e5f ILT |
2857 | for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); |
2858 | p != this->dynobj_list_.end(); | |
2859 | ++p) | |
2860 | { | |
2861 | const Dynobj::Needed& needed((*p)->needed()); | |
2862 | bool found_all = true; | |
7eaea549 ILT |
2863 | Dynobj::Needed::const_iterator pneeded; |
2864 | for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded) | |
e2827e5f ILT |
2865 | { |
2866 | if (this->sonames_.find(*pneeded) == this->sonames_.end()) | |
2867 | { | |
2868 | found_all = false; | |
2869 | break; | |
2870 | } | |
2871 | } | |
2872 | (*p)->set_has_unknown_needed_entries(!found_all); | |
7eaea549 ILT |
2873 | |
2874 | // --copy-dt-needed-entries aka --add-needed is a GNU ld option | |
612bdda1 ILT |
2875 | // that gold does not support. However, they cause no trouble |
2876 | // unless there is a DT_NEEDED entry that we don't know about; | |
2877 | // warn only in that case. | |
7eaea549 ILT |
2878 | if (!found_all |
2879 | && !issued_copy_dt_needed_error | |
2880 | && (parameters->options().copy_dt_needed_entries() | |
2881 | || parameters->options().add_needed())) | |
2882 | { | |
2883 | const char* optname; | |
2884 | if (parameters->options().copy_dt_needed_entries()) | |
2885 | optname = "--copy-dt-needed-entries"; | |
2886 | else | |
2887 | optname = "--add-needed"; | |
2888 | gold_error(_("%s is not supported but is required for %s in %s"), | |
2889 | optname, (*pneeded).c_str(), (*p)->name().c_str()); | |
2890 | issued_copy_dt_needed_error = true; | |
2891 | } | |
e2827e5f ILT |
2892 | } |
2893 | } | |
2894 | ||
92de84a6 ILT |
2895 | // Start processing an archive. |
2896 | ||
2897 | void | |
2898 | Input_objects::archive_start(Archive* archive) | |
2899 | { | |
dde3f402 ILT |
2900 | if (parameters->options().user_set_print_symbol_counts() |
2901 | || parameters->options().cref()) | |
92de84a6 ILT |
2902 | { |
2903 | if (this->cref_ == NULL) | |
2904 | this->cref_ = new Cref(); | |
2905 | this->cref_->add_archive_start(archive); | |
2906 | } | |
2907 | } | |
2908 | ||
2909 | // Stop processing an archive. | |
2910 | ||
2911 | void | |
2912 | Input_objects::archive_stop(Archive* archive) | |
2913 | { | |
dde3f402 ILT |
2914 | if (parameters->options().user_set_print_symbol_counts() |
2915 | || parameters->options().cref()) | |
92de84a6 ILT |
2916 | this->cref_->add_archive_stop(archive); |
2917 | } | |
2918 | ||
2919 | // Print symbol counts | |
2920 | ||
2921 | void | |
2922 | Input_objects::print_symbol_counts(const Symbol_table* symtab) const | |
2923 | { | |
2924 | if (parameters->options().user_set_print_symbol_counts() | |
2925 | && this->cref_ != NULL) | |
2926 | this->cref_->print_symbol_counts(symtab); | |
2927 | } | |
2928 | ||
dde3f402 ILT |
2929 | // Print a cross reference table. |
2930 | ||
2931 | void | |
2932 | Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const | |
2933 | { | |
2934 | if (parameters->options().cref() && this->cref_ != NULL) | |
2935 | this->cref_->print_cref(symtab, f); | |
2936 | } | |
2937 | ||
92e059d8 ILT |
2938 | // Relocate_info methods. |
2939 | ||
308ecdc7 ILT |
2940 | // Return a string describing the location of a relocation when file |
2941 | // and lineno information is not available. This is only used in | |
2942 | // error messages. | |
92e059d8 ILT |
2943 | |
2944 | template<int size, bool big_endian> | |
2945 | std::string | |
f7e2ee48 | 2946 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
92e059d8 | 2947 | { |
a55ce7fe | 2948 | Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
308ecdc7 ILT |
2949 | std::string ret = line_info.addr2line(this->data_shndx, offset, NULL); |
2950 | if (!ret.empty()) | |
2951 | return ret; | |
2952 | ||
2953 | ret = this->object->name(); | |
4c50553d | 2954 | |
f7e2ee48 ILT |
2955 | Symbol_location_info info; |
2956 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) | |
2957 | { | |
308ecdc7 ILT |
2958 | if (!info.source_file.empty()) |
2959 | { | |
2960 | ret += ":"; | |
2961 | ret += info.source_file; | |
2962 | } | |
2963 | size_t len = info.enclosing_symbol_name.length() + 100; | |
2964 | char* buf = new char[len]; | |
2965 | snprintf(buf, len, _(":function %s"), | |
2966 | info.enclosing_symbol_name.c_str()); | |
5c2c6c95 | 2967 | ret += buf; |
308ecdc7 ILT |
2968 | delete[] buf; |
2969 | return ret; | |
f7e2ee48 | 2970 | } |
308ecdc7 ILT |
2971 | |
2972 | ret += "("; | |
2973 | ret += this->object->section_name(this->data_shndx); | |
2974 | char buf[100]; | |
2975 | snprintf(buf, sizeof buf, "+0x%lx)", static_cast<long>(offset)); | |
2976 | ret += buf; | |
92e059d8 ILT |
2977 | return ret; |
2978 | } | |
2979 | ||
bae7f79e ILT |
2980 | } // End namespace gold. |
2981 | ||
2982 | namespace | |
2983 | { | |
2984 | ||
2985 | using namespace gold; | |
2986 | ||
2987 | // Read an ELF file with the header and return the appropriate | |
2988 | // instance of Object. | |
2989 | ||
2990 | template<int size, bool big_endian> | |
2991 | Object* | |
2992 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
029ba973 ILT |
2993 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr, |
2994 | bool* punconfigured) | |
bae7f79e | 2995 | { |
2e702c99 RM |
2996 | Target* target = select_target(input_file, offset, |
2997 | ehdr.get_e_machine(), size, big_endian, | |
f733487b DK |
2998 | ehdr.get_e_ident()[elfcpp::EI_OSABI], |
2999 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
3000 | if (target == NULL) | |
3001 | gold_fatal(_("%s: unsupported ELF machine number %d"), | |
3002 | name.c_str(), ehdr.get_e_machine()); | |
029ba973 ILT |
3003 | |
3004 | if (!parameters->target_valid()) | |
3005 | set_parameters_target(target); | |
3006 | else if (target != ¶meters->target()) | |
3007 | { | |
3008 | if (punconfigured != NULL) | |
3009 | *punconfigured = true; | |
3010 | else | |
3011 | gold_error(_("%s: incompatible target"), name.c_str()); | |
3012 | return NULL; | |
3013 | } | |
3014 | ||
f733487b DK |
3015 | return target->make_elf_object<size, big_endian>(name, input_file, offset, |
3016 | ehdr); | |
bae7f79e ILT |
3017 | } |
3018 | ||
3019 | } // End anonymous namespace. | |
3020 | ||
3021 | namespace gold | |
3022 | { | |
3023 | ||
f6060a4d ILT |
3024 | // Return whether INPUT_FILE is an ELF object. |
3025 | ||
3026 | bool | |
3027 | is_elf_object(Input_file* input_file, off_t offset, | |
ca09d69a | 3028 | const unsigned char** start, int* read_size) |
f6060a4d ILT |
3029 | { |
3030 | off_t filesize = input_file->file().filesize(); | |
c549a694 | 3031 | int want = elfcpp::Elf_recognizer::max_header_size; |
f6060a4d ILT |
3032 | if (filesize - offset < want) |
3033 | want = filesize - offset; | |
3034 | ||
3035 | const unsigned char* p = input_file->file().get_view(offset, 0, want, | |
3036 | true, false); | |
3037 | *start = p; | |
3038 | *read_size = want; | |
3039 | ||
c549a694 | 3040 | return elfcpp::Elf_recognizer::is_elf_file(p, want); |
f6060a4d ILT |
3041 | } |
3042 | ||
bae7f79e ILT |
3043 | // Read an ELF file and return the appropriate instance of Object. |
3044 | ||
3045 | Object* | |
3046 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
15f8229b ILT |
3047 | const unsigned char* p, section_offset_type bytes, |
3048 | bool* punconfigured) | |
bae7f79e | 3049 | { |
15f8229b ILT |
3050 | if (punconfigured != NULL) |
3051 | *punconfigured = false; | |
3052 | ||
c549a694 | 3053 | std::string error; |
ac33a407 DK |
3054 | bool big_endian = false; |
3055 | int size = 0; | |
c549a694 | 3056 | if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size, |
2e702c99 | 3057 | &big_endian, &error)) |
bae7f79e | 3058 | { |
c549a694 | 3059 | gold_error(_("%s: %s"), name.c_str(), error.c_str()); |
75f2446e | 3060 | return NULL; |
bae7f79e ILT |
3061 | } |
3062 | ||
c549a694 | 3063 | if (size == 32) |
bae7f79e | 3064 | { |
bae7f79e ILT |
3065 | if (big_endian) |
3066 | { | |
193a53d9 | 3067 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e ILT |
3068 | elfcpp::Ehdr<32, true> ehdr(p); |
3069 | return make_elf_sized_object<32, true>(name, input_file, | |
029ba973 | 3070 | offset, ehdr, punconfigured); |
193a53d9 | 3071 | #else |
15f8229b ILT |
3072 | if (punconfigured != NULL) |
3073 | *punconfigured = true; | |
3074 | else | |
3075 | gold_error(_("%s: not configured to support " | |
3076 | "32-bit big-endian object"), | |
3077 | name.c_str()); | |
75f2446e | 3078 | return NULL; |
193a53d9 | 3079 | #endif |
bae7f79e ILT |
3080 | } |
3081 | else | |
3082 | { | |
193a53d9 | 3083 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e ILT |
3084 | elfcpp::Ehdr<32, false> ehdr(p); |
3085 | return make_elf_sized_object<32, false>(name, input_file, | |
029ba973 | 3086 | offset, ehdr, punconfigured); |
193a53d9 | 3087 | #else |
15f8229b ILT |
3088 | if (punconfigured != NULL) |
3089 | *punconfigured = true; | |
3090 | else | |
3091 | gold_error(_("%s: not configured to support " | |
3092 | "32-bit little-endian object"), | |
3093 | name.c_str()); | |
75f2446e | 3094 | return NULL; |
193a53d9 | 3095 | #endif |
bae7f79e ILT |
3096 | } |
3097 | } | |
c549a694 | 3098 | else if (size == 64) |
bae7f79e | 3099 | { |
bae7f79e ILT |
3100 | if (big_endian) |
3101 | { | |
193a53d9 | 3102 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e ILT |
3103 | elfcpp::Ehdr<64, true> ehdr(p); |
3104 | return make_elf_sized_object<64, true>(name, input_file, | |
029ba973 | 3105 | offset, ehdr, punconfigured); |
193a53d9 | 3106 | #else |
15f8229b ILT |
3107 | if (punconfigured != NULL) |
3108 | *punconfigured = true; | |
3109 | else | |
3110 | gold_error(_("%s: not configured to support " | |
3111 | "64-bit big-endian object"), | |
3112 | name.c_str()); | |
75f2446e | 3113 | return NULL; |
193a53d9 | 3114 | #endif |
bae7f79e ILT |
3115 | } |
3116 | else | |
3117 | { | |
193a53d9 | 3118 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e ILT |
3119 | elfcpp::Ehdr<64, false> ehdr(p); |
3120 | return make_elf_sized_object<64, false>(name, input_file, | |
029ba973 | 3121 | offset, ehdr, punconfigured); |
193a53d9 | 3122 | #else |
15f8229b ILT |
3123 | if (punconfigured != NULL) |
3124 | *punconfigured = true; | |
3125 | else | |
3126 | gold_error(_("%s: not configured to support " | |
3127 | "64-bit little-endian object"), | |
3128 | name.c_str()); | |
75f2446e | 3129 | return NULL; |
193a53d9 | 3130 | #endif |
bae7f79e ILT |
3131 | } |
3132 | } | |
c549a694 ILT |
3133 | else |
3134 | gold_unreachable(); | |
bae7f79e ILT |
3135 | } |
3136 | ||
04bf7072 ILT |
3137 | // Instantiate the templates we need. |
3138 | ||
3139 | #ifdef HAVE_TARGET_32_LITTLE | |
3140 | template | |
3141 | void | |
3142 | Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*, | |
3143 | Read_symbols_data*); | |
3144 | #endif | |
3145 | ||
3146 | #ifdef HAVE_TARGET_32_BIG | |
3147 | template | |
3148 | void | |
3149 | Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*, | |
3150 | Read_symbols_data*); | |
3151 | #endif | |
3152 | ||
3153 | #ifdef HAVE_TARGET_64_LITTLE | |
3154 | template | |
3155 | void | |
3156 | Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*, | |
3157 | Read_symbols_data*); | |
3158 | #endif | |
3159 | ||
3160 | #ifdef HAVE_TARGET_64_BIG | |
3161 | template | |
3162 | void | |
3163 | Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*, | |
3164 | Read_symbols_data*); | |
3165 | #endif | |
bae7f79e | 3166 | |
193a53d9 | 3167 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e | 3168 | template |
6fa2a40b | 3169 | class Sized_relobj_file<32, false>; |
193a53d9 | 3170 | #endif |
bae7f79e | 3171 | |
193a53d9 | 3172 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e | 3173 | template |
6fa2a40b | 3174 | class Sized_relobj_file<32, true>; |
193a53d9 | 3175 | #endif |
bae7f79e | 3176 | |
193a53d9 | 3177 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e | 3178 | template |
6fa2a40b | 3179 | class Sized_relobj_file<64, false>; |
193a53d9 | 3180 | #endif |
bae7f79e | 3181 | |
193a53d9 | 3182 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e | 3183 | template |
6fa2a40b | 3184 | class Sized_relobj_file<64, true>; |
193a53d9 | 3185 | #endif |
bae7f79e | 3186 | |
193a53d9 | 3187 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
3188 | template |
3189 | struct Relocate_info<32, false>; | |
193a53d9 | 3190 | #endif |
92e059d8 | 3191 | |
193a53d9 | 3192 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
3193 | template |
3194 | struct Relocate_info<32, true>; | |
193a53d9 | 3195 | #endif |
92e059d8 | 3196 | |
193a53d9 | 3197 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
3198 | template |
3199 | struct Relocate_info<64, false>; | |
193a53d9 | 3200 | #endif |
92e059d8 | 3201 | |
193a53d9 | 3202 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
3203 | template |
3204 | struct Relocate_info<64, true>; | |
193a53d9 | 3205 | #endif |
92e059d8 | 3206 | |
9d3b86f6 ILT |
3207 | #ifdef HAVE_TARGET_32_LITTLE |
3208 | template | |
3209 | void | |
3210 | Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int); | |
3211 | ||
3212 | template | |
3213 | void | |
3214 | Xindex::read_symtab_xindex<32, false>(Object*, unsigned int, | |
3215 | const unsigned char*); | |
3216 | #endif | |
3217 | ||
3218 | #ifdef HAVE_TARGET_32_BIG | |
3219 | template | |
3220 | void | |
3221 | Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int); | |
3222 | ||
3223 | template | |
3224 | void | |
3225 | Xindex::read_symtab_xindex<32, true>(Object*, unsigned int, | |
3226 | const unsigned char*); | |
3227 | #endif | |
3228 | ||
3229 | #ifdef HAVE_TARGET_64_LITTLE | |
3230 | template | |
3231 | void | |
3232 | Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int); | |
3233 | ||
3234 | template | |
3235 | void | |
3236 | Xindex::read_symtab_xindex<64, false>(Object*, unsigned int, | |
3237 | const unsigned char*); | |
3238 | #endif | |
3239 | ||
3240 | #ifdef HAVE_TARGET_64_BIG | |
3241 | template | |
3242 | void | |
3243 | Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int); | |
3244 | ||
3245 | template | |
3246 | void | |
3247 | Xindex::read_symtab_xindex<64, true>(Object*, unsigned int, | |
3248 | const unsigned char*); | |
3249 | #endif | |
3250 | ||
bae7f79e | 3251 | } // End namespace gold. |