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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
6f2750fe | 3 | // Copyright (C) 2006-2016 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
14bfc3f5 ILT |
23 | #include "gold.h" |
24 | ||
04bf7072 | 25 | #include <cstring> |
14bfc3f5 | 26 | #include <stdint.h> |
04bf7072 | 27 | #include <algorithm> |
70e654ba | 28 | #include <set> |
14bfc3f5 ILT |
29 | #include <string> |
30 | #include <utility> | |
a2b1aa12 | 31 | #include "demangle.h" |
14bfc3f5 | 32 | |
6d03d481 | 33 | #include "gc.h" |
14bfc3f5 | 34 | #include "object.h" |
70e654ba | 35 | #include "dwarf_reader.h" |
dbe717ef | 36 | #include "dynobj.h" |
75f65a3e | 37 | #include "output.h" |
61ba1cf9 | 38 | #include "target.h" |
645f8123 | 39 | #include "workqueue.h" |
14bfc3f5 | 40 | #include "symtab.h" |
88a4108b | 41 | #include "script.h" |
89fc3421 | 42 | #include "plugin.h" |
cdc29364 | 43 | #include "incremental.h" |
14bfc3f5 ILT |
44 | |
45 | namespace gold | |
46 | { | |
47 | ||
48 | // Class Symbol. | |
49 | ||
ead1e424 ILT |
50 | // Initialize fields in Symbol. This initializes everything except u_ |
51 | // and source_. | |
14bfc3f5 | 52 | |
14bfc3f5 | 53 | void |
2ea97941 ILT |
54 | Symbol::init_fields(const char* name, const char* version, |
55 | elfcpp::STT type, elfcpp::STB binding, | |
56 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 | 57 | { |
2ea97941 ILT |
58 | this->name_ = name; |
59 | this->version_ = version; | |
c06b7b0b ILT |
60 | this->symtab_index_ = 0; |
61 | this->dynsym_index_ = 0; | |
0a65a3a7 | 62 | this->got_offsets_.init(); |
880cd20d | 63 | this->plt_offset_ = -1U; |
2ea97941 ILT |
64 | this->type_ = type; |
65 | this->binding_ = binding; | |
66 | this->visibility_ = visibility; | |
67 | this->nonvis_ = nonvis; | |
1564db8d ILT |
68 | this->is_def_ = false; |
69 | this->is_forwarder_ = false; | |
aeddab66 | 70 | this->has_alias_ = false; |
c06b7b0b | 71 | this->needs_dynsym_entry_ = false; |
008db82e | 72 | this->in_reg_ = false; |
ead1e424 | 73 | this->in_dyn_ = false; |
f6ce93d6 | 74 | this->has_warning_ = false; |
46fe1623 | 75 | this->is_copied_from_dynobj_ = false; |
55a93433 | 76 | this->is_forced_local_ = false; |
d491d34e | 77 | this->is_ordinary_shndx_ = false; |
89fc3421 | 78 | this->in_real_elf_ = false; |
880cd20d | 79 | this->is_defined_in_discarded_section_ = false; |
ce279a62 CC |
80 | this->undef_binding_set_ = false; |
81 | this->undef_binding_weak_ = false; | |
5146f448 | 82 | this->is_predefined_ = false; |
ead1e424 ILT |
83 | } |
84 | ||
a2b1aa12 ILT |
85 | // Return the demangled version of the symbol's name, but only |
86 | // if the --demangle flag was set. | |
87 | ||
88 | static std::string | |
2ea97941 | 89 | demangle(const char* name) |
a2b1aa12 | 90 | { |
086a1841 | 91 | if (!parameters->options().do_demangle()) |
2ea97941 | 92 | return name; |
ff541f30 | 93 | |
a2b1aa12 ILT |
94 | // cplus_demangle allocates memory for the result it returns, |
95 | // and returns NULL if the name is already demangled. | |
2ea97941 | 96 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); |
a2b1aa12 | 97 | if (demangled_name == NULL) |
2ea97941 | 98 | return name; |
a2b1aa12 ILT |
99 | |
100 | std::string retval(demangled_name); | |
101 | free(demangled_name); | |
102 | return retval; | |
103 | } | |
104 | ||
105 | std::string | |
106 | Symbol::demangled_name() const | |
107 | { | |
ff541f30 | 108 | return demangle(this->name()); |
a2b1aa12 ILT |
109 | } |
110 | ||
ead1e424 ILT |
111 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
112 | ||
113 | template<int size, bool big_endian> | |
114 | void | |
2ea97941 | 115 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
f3e9c5c5 ILT |
116 | const elfcpp::Sym<size, big_endian>& sym, |
117 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 | 118 | { |
2ea97941 | 119 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), |
ead1e424 | 120 | sym.get_st_visibility(), sym.get_st_nonvis()); |
2ea97941 | 121 | this->u_.from_object.object = object; |
d491d34e ILT |
122 | this->u_.from_object.shndx = st_shndx; |
123 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 124 | this->source_ = FROM_OBJECT; |
2ea97941 ILT |
125 | this->in_reg_ = !object->is_dynamic(); |
126 | this->in_dyn_ = object->is_dynamic(); | |
127 | this->in_real_elf_ = object->pluginobj() == NULL; | |
14bfc3f5 ILT |
128 | } |
129 | ||
ead1e424 ILT |
130 | // Initialize the fields in the base class Symbol for a symbol defined |
131 | // in an Output_data. | |
132 | ||
133 | void | |
2ea97941 ILT |
134 | Symbol::init_base_output_data(const char* name, const char* version, |
135 | Output_data* od, elfcpp::STT type, | |
136 | elfcpp::STB binding, elfcpp::STV visibility, | |
5146f448 CC |
137 | unsigned char nonvis, bool offset_is_from_end, |
138 | bool is_predefined) | |
ead1e424 | 139 | { |
2ea97941 | 140 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 141 | this->u_.in_output_data.output_data = od; |
2ea97941 | 142 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; |
ead1e424 | 143 | this->source_ = IN_OUTPUT_DATA; |
008db82e | 144 | this->in_reg_ = true; |
89fc3421 | 145 | this->in_real_elf_ = true; |
5146f448 | 146 | this->is_predefined_ = is_predefined; |
ead1e424 ILT |
147 | } |
148 | ||
149 | // Initialize the fields in the base class Symbol for a symbol defined | |
150 | // in an Output_segment. | |
151 | ||
152 | void | |
2ea97941 ILT |
153 | Symbol::init_base_output_segment(const char* name, const char* version, |
154 | Output_segment* os, elfcpp::STT type, | |
155 | elfcpp::STB binding, elfcpp::STV visibility, | |
156 | unsigned char nonvis, | |
5146f448 CC |
157 | Segment_offset_base offset_base, |
158 | bool is_predefined) | |
ead1e424 | 159 | { |
2ea97941 | 160 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 161 | this->u_.in_output_segment.output_segment = os; |
2ea97941 | 162 | this->u_.in_output_segment.offset_base = offset_base; |
ead1e424 | 163 | this->source_ = IN_OUTPUT_SEGMENT; |
008db82e | 164 | this->in_reg_ = true; |
89fc3421 | 165 | this->in_real_elf_ = true; |
5146f448 | 166 | this->is_predefined_ = is_predefined; |
ead1e424 ILT |
167 | } |
168 | ||
169 | // Initialize the fields in the base class Symbol for a symbol defined | |
170 | // as a constant. | |
171 | ||
172 | void | |
2ea97941 ILT |
173 | Symbol::init_base_constant(const char* name, const char* version, |
174 | elfcpp::STT type, elfcpp::STB binding, | |
5146f448 CC |
175 | elfcpp::STV visibility, unsigned char nonvis, |
176 | bool is_predefined) | |
f3e9c5c5 | 177 | { |
2ea97941 | 178 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
179 | this->source_ = IS_CONSTANT; |
180 | this->in_reg_ = true; | |
89fc3421 | 181 | this->in_real_elf_ = true; |
5146f448 | 182 | this->is_predefined_ = is_predefined; |
f3e9c5c5 ILT |
183 | } |
184 | ||
185 | // Initialize the fields in the base class Symbol for an undefined | |
186 | // symbol. | |
187 | ||
188 | void | |
2ea97941 ILT |
189 | Symbol::init_base_undefined(const char* name, const char* version, |
190 | elfcpp::STT type, elfcpp::STB binding, | |
191 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 192 | { |
2ea97941 | 193 | this->init_fields(name, version, type, binding, visibility, nonvis); |
d7ab2a47 | 194 | this->dynsym_index_ = -1U; |
f3e9c5c5 | 195 | this->source_ = IS_UNDEFINED; |
008db82e | 196 | this->in_reg_ = true; |
89fc3421 | 197 | this->in_real_elf_ = true; |
ead1e424 ILT |
198 | } |
199 | ||
c7912668 ILT |
200 | // Allocate a common symbol in the base. |
201 | ||
202 | void | |
203 | Symbol::allocate_base_common(Output_data* od) | |
204 | { | |
205 | gold_assert(this->is_common()); | |
206 | this->source_ = IN_OUTPUT_DATA; | |
207 | this->u_.in_output_data.output_data = od; | |
208 | this->u_.in_output_data.offset_is_from_end = false; | |
209 | } | |
210 | ||
ead1e424 | 211 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
212 | |
213 | template<int size> | |
214 | template<bool big_endian> | |
215 | void | |
2ea97941 ILT |
216 | Sized_symbol<size>::init_object(const char* name, const char* version, |
217 | Object* object, | |
f3e9c5c5 ILT |
218 | const elfcpp::Sym<size, big_endian>& sym, |
219 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 220 | { |
2ea97941 | 221 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 222 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
223 | this->symsize_ = sym.get_st_size(); |
224 | } | |
225 | ||
226 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
227 | // Output_data. | |
228 | ||
229 | template<int size> | |
230 | void | |
2ea97941 ILT |
231 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
232 | Output_data* od, Value_type value, | |
233 | Size_type symsize, elfcpp::STT type, | |
234 | elfcpp::STB binding, | |
235 | elfcpp::STV visibility, | |
236 | unsigned char nonvis, | |
5146f448 CC |
237 | bool offset_is_from_end, |
238 | bool is_predefined) | |
ead1e424 | 239 | { |
2ea97941 | 240 | this->init_base_output_data(name, version, od, type, binding, visibility, |
5146f448 | 241 | nonvis, offset_is_from_end, is_predefined); |
2ea97941 ILT |
242 | this->value_ = value; |
243 | this->symsize_ = symsize; | |
ead1e424 ILT |
244 | } |
245 | ||
246 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
247 | // Output_segment. | |
248 | ||
249 | template<int size> | |
250 | void | |
2ea97941 ILT |
251 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
252 | Output_segment* os, Value_type value, | |
253 | Size_type symsize, elfcpp::STT type, | |
254 | elfcpp::STB binding, | |
255 | elfcpp::STV visibility, | |
256 | unsigned char nonvis, | |
5146f448 CC |
257 | Segment_offset_base offset_base, |
258 | bool is_predefined) | |
ead1e424 | 259 | { |
2ea97941 | 260 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
5146f448 | 261 | nonvis, offset_base, is_predefined); |
2ea97941 ILT |
262 | this->value_ = value; |
263 | this->symsize_ = symsize; | |
ead1e424 ILT |
264 | } |
265 | ||
266 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
267 | // constant. | |
268 | ||
269 | template<int size> | |
270 | void | |
2ea97941 ILT |
271 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
272 | Value_type value, Size_type symsize, | |
273 | elfcpp::STT type, elfcpp::STB binding, | |
5146f448 CC |
274 | elfcpp::STV visibility, unsigned char nonvis, |
275 | bool is_predefined) | |
ead1e424 | 276 | { |
5146f448 CC |
277 | this->init_base_constant(name, version, type, binding, visibility, nonvis, |
278 | is_predefined); | |
2ea97941 ILT |
279 | this->value_ = value; |
280 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
281 | } |
282 | ||
f3e9c5c5 ILT |
283 | // Initialize the fields in Sized_symbol for an undefined symbol. |
284 | ||
285 | template<int size> | |
286 | void | |
2ea97941 | 287 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
dc1c8a16 CC |
288 | Value_type value, elfcpp::STT type, |
289 | elfcpp::STB binding, elfcpp::STV visibility, | |
290 | unsigned char nonvis) | |
f3e9c5c5 | 291 | { |
2ea97941 | 292 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
dc1c8a16 | 293 | this->value_ = value; |
f3e9c5c5 ILT |
294 | this->symsize_ = 0; |
295 | } | |
296 | ||
6d1c4efb ILT |
297 | // Return an allocated string holding the symbol's name as |
298 | // name@version. This is used for relocatable links. | |
299 | ||
300 | std::string | |
301 | Symbol::versioned_name() const | |
302 | { | |
303 | gold_assert(this->version_ != NULL); | |
304 | std::string ret = this->name_; | |
305 | ret.push_back('@'); | |
306 | if (this->is_def_) | |
307 | ret.push_back('@'); | |
308 | ret += this->version_; | |
309 | return ret; | |
310 | } | |
311 | ||
8a5e3e08 ILT |
312 | // Return true if SHNDX represents a common symbol. |
313 | ||
314 | bool | |
2ea97941 | 315 | Symbol::is_common_shndx(unsigned int shndx) |
8a5e3e08 | 316 | { |
2ea97941 ILT |
317 | return (shndx == elfcpp::SHN_COMMON |
318 | || shndx == parameters->target().small_common_shndx() | |
319 | || shndx == parameters->target().large_common_shndx()); | |
8a5e3e08 ILT |
320 | } |
321 | ||
c7912668 ILT |
322 | // Allocate a common symbol. |
323 | ||
324 | template<int size> | |
325 | void | |
2ea97941 | 326 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) |
c7912668 ILT |
327 | { |
328 | this->allocate_base_common(od); | |
2ea97941 | 329 | this->value_ = value; |
c7912668 ILT |
330 | } |
331 | ||
c82fbeee CS |
332 | // The ""'s around str ensure str is a string literal, so sizeof works. |
333 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) | |
334 | ||
436ca963 ILT |
335 | // Return true if this symbol should be added to the dynamic symbol |
336 | // table. | |
337 | ||
7b549045 | 338 | bool |
ce97fa81 | 339 | Symbol::should_add_dynsym_entry(Symbol_table* symtab) const |
436ca963 | 340 | { |
badc8139 RÁE |
341 | // If the symbol is only present on plugin files, the plugin decided we |
342 | // don't need it. | |
343 | if (!this->in_real_elf()) | |
344 | return false; | |
345 | ||
436ca963 ILT |
346 | // If the symbol is used by a dynamic relocation, we need to add it. |
347 | if (this->needs_dynsym_entry()) | |
348 | return true; | |
349 | ||
6d03d481 ST |
350 | // If this symbol's section is not added, the symbol need not be added. |
351 | // The section may have been GCed. Note that export_dynamic is being | |
352 | // overridden here. This should not be done for shared objects. | |
353 | if (parameters->options().gc_sections() | |
354 | && !parameters->options().shared() | |
355 | && this->source() == Symbol::FROM_OBJECT | |
356 | && !this->object()->is_dynamic()) | |
357 | { | |
358 | Relobj* relobj = static_cast<Relobj*>(this->object()); | |
359 | bool is_ordinary; | |
2ea97941 ILT |
360 | unsigned int shndx = this->shndx(&is_ordinary); |
361 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF | |
ce97fa81 ST |
362 | && !relobj->is_section_included(shndx) |
363 | && !symtab->is_section_folded(relobj, shndx)) | |
6d03d481 ST |
364 | return false; |
365 | } | |
366 | ||
31821be0 CC |
367 | // If the symbol was forced dynamic in a --dynamic-list file |
368 | // or an --export-dynamic-symbol option, add it. | |
b24fdbf5 CC |
369 | if (!this->is_from_dynobj() |
370 | && (parameters->options().in_dynamic_list(this->name()) | |
371 | || parameters->options().is_export_dynamic_symbol(this->name()))) | |
31821be0 CC |
372 | { |
373 | if (!this->is_forced_local()) | |
374 | return true; | |
375 | gold_warning(_("Cannot export local symbol '%s'"), | |
376 | this->demangled_name().c_str()); | |
377 | return false; | |
378 | } | |
379 | ||
55a93433 ILT |
380 | // If the symbol was forced local in a version script, do not add it. |
381 | if (this->is_forced_local()) | |
382 | return false; | |
383 | ||
c82fbeee CS |
384 | // If dynamic-list-data was specified, add any STT_OBJECT. |
385 | if (parameters->options().dynamic_list_data() | |
386 | && !this->is_from_dynobj() | |
387 | && this->type() == elfcpp::STT_OBJECT) | |
388 | return true; | |
389 | ||
390 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. | |
391 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. | |
392 | if ((parameters->options().dynamic_list_cpp_new() | |
393 | || parameters->options().dynamic_list_cpp_typeinfo()) | |
394 | && !this->is_from_dynobj()) | |
395 | { | |
396 | // TODO(csilvers): We could probably figure out if we're an operator | |
397 | // new/delete or typeinfo without the need to demangle. | |
2ea97941 ILT |
398 | char* demangled_name = cplus_demangle(this->name(), |
399 | DMGL_ANSI | DMGL_PARAMS); | |
400 | if (demangled_name == NULL) | |
c82fbeee CS |
401 | { |
402 | // Not a C++ symbol, so it can't satisfy these flags | |
403 | } | |
404 | else if (parameters->options().dynamic_list_cpp_new() | |
2ea97941 ILT |
405 | && (strprefix(demangled_name, "operator new") |
406 | || strprefix(demangled_name, "operator delete"))) | |
c82fbeee | 407 | { |
2ea97941 | 408 | free(demangled_name); |
c82fbeee CS |
409 | return true; |
410 | } | |
411 | else if (parameters->options().dynamic_list_cpp_typeinfo() | |
2ea97941 ILT |
412 | && (strprefix(demangled_name, "typeinfo name for") |
413 | || strprefix(demangled_name, "typeinfo for"))) | |
c82fbeee | 414 | { |
2ea97941 | 415 | free(demangled_name); |
c82fbeee CS |
416 | return true; |
417 | } | |
418 | else | |
2ea97941 | 419 | free(demangled_name); |
c82fbeee CS |
420 | } |
421 | ||
436ca963 | 422 | // If exporting all symbols or building a shared library, |
4b889c30 | 423 | // or the symbol should be globally unique (GNU_UNIQUE), |
436ca963 ILT |
424 | // and the symbol is defined in a regular object and is |
425 | // externally visible, we need to add it. | |
4b889c30 IC |
426 | if ((parameters->options().export_dynamic() |
427 | || parameters->options().shared() | |
428 | || (parameters->options().gnu_unique() | |
429 | && this->binding() == elfcpp::STB_GNU_UNIQUE)) | |
436ca963 | 430 | && !this->is_from_dynobj() |
f3ae1b28 | 431 | && !this->is_undefined() |
436ca963 ILT |
432 | && this->is_externally_visible()) |
433 | return true; | |
434 | ||
435 | return false; | |
436 | } | |
437 | ||
b3b74ddc ILT |
438 | // Return true if the final value of this symbol is known at link |
439 | // time. | |
440 | ||
441 | bool | |
442 | Symbol::final_value_is_known() const | |
443 | { | |
444 | // If we are not generating an executable, then no final values are | |
a6a17750 CC |
445 | // known, since they will change at runtime, with the exception of |
446 | // TLS symbols in a position-independent executable. | |
447 | if ((parameters->options().output_is_position_independent() | |
448 | || parameters->options().relocatable()) | |
449 | && !(this->type() == elfcpp::STT_TLS | |
450 | && parameters->options().pie())) | |
b3b74ddc ILT |
451 | return false; |
452 | ||
f3e9c5c5 ILT |
453 | // If the symbol is not from an object file, and is not undefined, |
454 | // then it is defined, and known. | |
b3b74ddc | 455 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
456 | { |
457 | if (this->source_ != IS_UNDEFINED) | |
458 | return true; | |
459 | } | |
460 | else | |
461 | { | |
462 | // If the symbol is from a dynamic object, then the final value | |
463 | // is not known. | |
464 | if (this->object()->is_dynamic()) | |
465 | return false; | |
b3b74ddc | 466 | |
f3e9c5c5 ILT |
467 | // If the symbol is not undefined (it is defined or common), |
468 | // then the final value is known. | |
469 | if (!this->is_undefined()) | |
470 | return true; | |
471 | } | |
b3b74ddc ILT |
472 | |
473 | // If the symbol is undefined, then whether the final value is known | |
474 | // depends on whether we are doing a static link. If we are doing a | |
475 | // dynamic link, then the final value could be filled in at runtime. | |
476 | // This could reasonably be the case for a weak undefined symbol. | |
477 | return parameters->doing_static_link(); | |
478 | } | |
479 | ||
77e65537 | 480 | // Return the output section where this symbol is defined. |
a445fddf | 481 | |
77e65537 ILT |
482 | Output_section* |
483 | Symbol::output_section() const | |
a445fddf ILT |
484 | { |
485 | switch (this->source_) | |
486 | { | |
487 | case FROM_OBJECT: | |
77e65537 | 488 | { |
2ea97941 ILT |
489 | unsigned int shndx = this->u_.from_object.shndx; |
490 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) | |
77e65537 ILT |
491 | { |
492 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 493 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 494 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
2ea97941 | 495 | return relobj->output_section(shndx); |
77e65537 ILT |
496 | } |
497 | return NULL; | |
498 | } | |
499 | ||
a445fddf | 500 | case IN_OUTPUT_DATA: |
77e65537 ILT |
501 | return this->u_.in_output_data.output_data->output_section(); |
502 | ||
a445fddf | 503 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
504 | case IS_CONSTANT: |
505 | case IS_UNDEFINED: | |
77e65537 ILT |
506 | return NULL; |
507 | ||
508 | default: | |
509 | gold_unreachable(); | |
510 | } | |
511 | } | |
512 | ||
513 | // Set the symbol's output section. This is used for symbols defined | |
514 | // in scripts. This should only be called after the symbol table has | |
515 | // been finalized. | |
516 | ||
517 | void | |
518 | Symbol::set_output_section(Output_section* os) | |
519 | { | |
520 | switch (this->source_) | |
521 | { | |
522 | case FROM_OBJECT: | |
523 | case IN_OUTPUT_DATA: | |
524 | gold_assert(this->output_section() == os); | |
525 | break; | |
f3e9c5c5 | 526 | case IS_CONSTANT: |
77e65537 ILT |
527 | this->source_ = IN_OUTPUT_DATA; |
528 | this->u_.in_output_data.output_data = os; | |
529 | this->u_.in_output_data.offset_is_from_end = false; | |
530 | break; | |
531 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 532 | case IS_UNDEFINED: |
a445fddf ILT |
533 | default: |
534 | gold_unreachable(); | |
535 | } | |
536 | } | |
537 | ||
d1bddd3c CC |
538 | // Set the symbol's output segment. This is used for pre-defined |
539 | // symbols whose segments aren't known until after layout is done | |
540 | // (e.g., __ehdr_start). | |
541 | ||
542 | void | |
543 | Symbol::set_output_segment(Output_segment* os, Segment_offset_base base) | |
544 | { | |
545 | gold_assert(this->is_predefined_); | |
546 | this->source_ = IN_OUTPUT_SEGMENT; | |
547 | this->u_.in_output_segment.output_segment = os; | |
548 | this->u_.in_output_segment.offset_base = base; | |
549 | } | |
550 | ||
551 | // Set the symbol to undefined. This is used for pre-defined | |
552 | // symbols whose segments aren't known until after layout is done | |
553 | // (e.g., __ehdr_start). | |
554 | ||
555 | void | |
556 | Symbol::set_undefined() | |
557 | { | |
d1bddd3c CC |
558 | this->source_ = IS_UNDEFINED; |
559 | this->is_predefined_ = false; | |
560 | } | |
561 | ||
14bfc3f5 ILT |
562 | // Class Symbol_table. |
563 | ||
09124467 | 564 | Symbol_table::Symbol_table(unsigned int count, |
2ea97941 | 565 | const Version_script_info& version_script) |
6d013333 | 566 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
8a5e3e08 ILT |
567 | forwarders_(), commons_(), tls_commons_(), small_commons_(), |
568 | large_commons_(), forced_locals_(), warnings_(), | |
dc1c8a16 CC |
569 | version_script_(version_script), gc_(NULL), icf_(NULL), |
570 | target_symbols_() | |
14bfc3f5 | 571 | { |
6d013333 | 572 | namepool_.reserve(count); |
14bfc3f5 ILT |
573 | } |
574 | ||
575 | Symbol_table::~Symbol_table() | |
576 | { | |
577 | } | |
578 | ||
ad8f37d1 ILT |
579 | // The symbol table key equality function. This is called with |
580 | // Stringpool keys. | |
14bfc3f5 | 581 | |
ad8f37d1 | 582 | inline bool |
14bfc3f5 ILT |
583 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
584 | const Symbol_table_key& k2) const | |
585 | { | |
586 | return k1.first == k2.first && k1.second == k2.second; | |
587 | } | |
588 | ||
ef15dade | 589 | bool |
efc6fa12 | 590 | Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const |
ef15dade | 591 | { |
032ce4e9 | 592 | return (parameters->options().icf_enabled() |
2ea97941 | 593 | && this->icf_->is_section_folded(obj, shndx)); |
ef15dade ST |
594 | } |
595 | ||
31821be0 CC |
596 | // For symbols that have been listed with a -u or --export-dynamic-symbol |
597 | // option, add them to the work list to avoid gc'ing them. | |
6d03d481 ST |
598 | |
599 | void | |
88a4108b | 600 | Symbol_table::gc_mark_undef_symbols(Layout* layout) |
6d03d481 ST |
601 | { |
602 | for (options::String_set::const_iterator p = | |
603 | parameters->options().undefined_begin(); | |
604 | p != parameters->options().undefined_end(); | |
605 | ++p) | |
606 | { | |
2ea97941 ILT |
607 | const char* name = p->c_str(); |
608 | Symbol* sym = this->lookup(name); | |
ca09d69a | 609 | gold_assert(sym != NULL); |
6d03d481 ST |
610 | if (sym->source() == Symbol::FROM_OBJECT |
611 | && !sym->object()->is_dynamic()) | |
612 | { | |
e81fea4d | 613 | this->gc_mark_symbol(sym); |
6d03d481 ST |
614 | } |
615 | } | |
88a4108b | 616 | |
31821be0 CC |
617 | for (options::String_set::const_iterator p = |
618 | parameters->options().export_dynamic_symbol_begin(); | |
619 | p != parameters->options().export_dynamic_symbol_end(); | |
620 | ++p) | |
621 | { | |
622 | const char* name = p->c_str(); | |
623 | Symbol* sym = this->lookup(name); | |
1d5dfe78 CC |
624 | // It's not an error if a symbol named by --export-dynamic-symbol |
625 | // is undefined. | |
626 | if (sym != NULL | |
627 | && sym->source() == Symbol::FROM_OBJECT | |
31821be0 CC |
628 | && !sym->object()->is_dynamic()) |
629 | { | |
e81fea4d | 630 | this->gc_mark_symbol(sym); |
31821be0 CC |
631 | } |
632 | } | |
633 | ||
88a4108b ILT |
634 | for (Script_options::referenced_const_iterator p = |
635 | layout->script_options()->referenced_begin(); | |
636 | p != layout->script_options()->referenced_end(); | |
637 | ++p) | |
638 | { | |
639 | Symbol* sym = this->lookup(p->c_str()); | |
640 | gold_assert(sym != NULL); | |
641 | if (sym->source() == Symbol::FROM_OBJECT | |
642 | && !sym->object()->is_dynamic()) | |
643 | { | |
e81fea4d | 644 | this->gc_mark_symbol(sym); |
88a4108b ILT |
645 | } |
646 | } | |
6d03d481 ST |
647 | } |
648 | ||
649 | void | |
7257cc92 | 650 | Symbol_table::gc_mark_symbol(Symbol* sym) |
6d03d481 | 651 | { |
7257cc92 | 652 | // Add the object and section to the work list. |
7257cc92 ST |
653 | bool is_ordinary; |
654 | unsigned int shndx = sym->shndx(&is_ordinary); | |
efc6fa12 | 655 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic()) |
6d03d481 | 656 | { |
7257cc92 | 657 | gold_assert(this->gc_!= NULL); |
efc6fa12 CC |
658 | Relobj* relobj = static_cast<Relobj*>(sym->object()); |
659 | this->gc_->worklist().push_back(Section_id(relobj, shndx)); | |
6d03d481 | 660 | } |
e81fea4d | 661 | parameters->target().gc_mark_symbol(this, sym); |
6d03d481 ST |
662 | } |
663 | ||
664 | // When doing garbage collection, keep symbols that have been seen in | |
665 | // dynamic objects. | |
666 | inline void | |
667 | Symbol_table::gc_mark_dyn_syms(Symbol* sym) | |
668 | { | |
669 | if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT | |
670 | && !sym->object()->is_dynamic()) | |
7257cc92 | 671 | this->gc_mark_symbol(sym); |
6d03d481 ST |
672 | } |
673 | ||
dd8670e5 | 674 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
675 | |
676 | void | |
677 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
678 | { | |
a3ad94ed ILT |
679 | gold_assert(from != to); |
680 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
681 | this->forwarders_[from] = to; |
682 | from->set_forwarder(); | |
683 | } | |
684 | ||
61ba1cf9 ILT |
685 | // Resolve the forwards from FROM, returning the real symbol. |
686 | ||
14bfc3f5 | 687 | Symbol* |
c06b7b0b | 688 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 689 | { |
a3ad94ed | 690 | gold_assert(from->is_forwarder()); |
c06b7b0b | 691 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 692 | this->forwarders_.find(from); |
a3ad94ed | 693 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
694 | return p->second; |
695 | } | |
696 | ||
61ba1cf9 ILT |
697 | // Look up a symbol by name. |
698 | ||
699 | Symbol* | |
2ea97941 | 700 | Symbol_table::lookup(const char* name, const char* version) const |
61ba1cf9 | 701 | { |
f0641a0b | 702 | Stringpool::Key name_key; |
2ea97941 ILT |
703 | name = this->namepool_.find(name, &name_key); |
704 | if (name == NULL) | |
61ba1cf9 | 705 | return NULL; |
f0641a0b ILT |
706 | |
707 | Stringpool::Key version_key = 0; | |
2ea97941 | 708 | if (version != NULL) |
61ba1cf9 | 709 | { |
2ea97941 ILT |
710 | version = this->namepool_.find(version, &version_key); |
711 | if (version == NULL) | |
61ba1cf9 ILT |
712 | return NULL; |
713 | } | |
714 | ||
f0641a0b | 715 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
716 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
717 | if (p == this->table_.end()) | |
718 | return NULL; | |
719 | return p->second; | |
720 | } | |
721 | ||
14bfc3f5 ILT |
722 | // Resolve a Symbol with another Symbol. This is only used in the |
723 | // unusual case where there are references to both an unversioned | |
724 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
725 | // version is the default version. Because this is unusual, we do |
726 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 727 | |
1564db8d | 728 | template<int size, bool big_endian> |
14bfc3f5 | 729 | void |
95d14cd3 | 730 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 731 | { |
1564db8d ILT |
732 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
733 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 734 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
735 | esym.put_st_value(from->value()); |
736 | esym.put_st_size(from->symsize()); | |
737 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 738 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e | 739 | bool is_ordinary; |
2ea97941 ILT |
740 | unsigned int shndx = from->shndx(&is_ordinary); |
741 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
b45e00b3 | 742 | from->version(), true); |
1ebd95fd ILT |
743 | if (from->in_reg()) |
744 | to->set_in_reg(); | |
745 | if (from->in_dyn()) | |
746 | to->set_in_dyn(); | |
6d03d481 ST |
747 | if (parameters->options().gc_sections()) |
748 | this->gc_mark_dyn_syms(to); | |
14bfc3f5 ILT |
749 | } |
750 | ||
0602e05a ILT |
751 | // Record that a symbol is forced to be local by a version script or |
752 | // by visibility. | |
55a93433 ILT |
753 | |
754 | void | |
755 | Symbol_table::force_local(Symbol* sym) | |
756 | { | |
757 | if (!sym->is_defined() && !sym->is_common()) | |
758 | return; | |
759 | if (sym->is_forced_local()) | |
760 | { | |
761 | // We already got this one. | |
762 | return; | |
763 | } | |
764 | sym->set_is_forced_local(); | |
765 | this->forced_locals_.push_back(sym); | |
766 | } | |
767 | ||
0864d551 ILT |
768 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
769 | // is only called for undefined symbols, when at least one --wrap | |
770 | // option was used. | |
771 | ||
772 | const char* | |
2ea97941 | 773 | Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key) |
0864d551 ILT |
774 | { |
775 | // For some targets, we need to ignore a specific character when | |
776 | // wrapping, and add it back later. | |
777 | char prefix = '\0'; | |
2ea97941 | 778 | if (name[0] == parameters->target().wrap_char()) |
0864d551 | 779 | { |
2ea97941 ILT |
780 | prefix = name[0]; |
781 | ++name; | |
0864d551 ILT |
782 | } |
783 | ||
2ea97941 | 784 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
785 | { |
786 | // Turn NAME into __wrap_NAME. | |
787 | std::string s; | |
788 | if (prefix != '\0') | |
789 | s += prefix; | |
790 | s += "__wrap_"; | |
2ea97941 | 791 | s += name; |
0864d551 ILT |
792 | |
793 | // This will give us both the old and new name in NAMEPOOL_, but | |
794 | // that is OK. Only the versions we need will wind up in the | |
795 | // real string table in the output file. | |
796 | return this->namepool_.add(s.c_str(), true, name_key); | |
797 | } | |
798 | ||
799 | const char* const real_prefix = "__real_"; | |
800 | const size_t real_prefix_length = strlen(real_prefix); | |
2ea97941 ILT |
801 | if (strncmp(name, real_prefix, real_prefix_length) == 0 |
802 | && parameters->options().is_wrap(name + real_prefix_length)) | |
0864d551 ILT |
803 | { |
804 | // Turn __real_NAME into NAME. | |
805 | std::string s; | |
806 | if (prefix != '\0') | |
807 | s += prefix; | |
2ea97941 | 808 | s += name + real_prefix_length; |
0864d551 ILT |
809 | return this->namepool_.add(s.c_str(), true, name_key); |
810 | } | |
811 | ||
2ea97941 | 812 | return name; |
0864d551 ILT |
813 | } |
814 | ||
8c500701 ILT |
815 | // This is called when we see a symbol NAME/VERSION, and the symbol |
816 | // already exists in the symbol table, and VERSION is marked as being | |
817 | // the default version. SYM is the NAME/VERSION symbol we just added. | |
818 | // DEFAULT_IS_NEW is true if this is the first time we have seen the | |
819 | // symbol NAME/NULL. PDEF points to the entry for NAME/NULL. | |
820 | ||
821 | template<int size, bool big_endian> | |
822 | void | |
823 | Symbol_table::define_default_version(Sized_symbol<size>* sym, | |
824 | bool default_is_new, | |
825 | Symbol_table_type::iterator pdef) | |
826 | { | |
827 | if (default_is_new) | |
828 | { | |
829 | // This is the first time we have seen NAME/NULL. Make | |
830 | // NAME/NULL point to NAME/VERSION, and mark SYM as the default | |
831 | // version. | |
832 | pdef->second = sym; | |
833 | sym->set_is_default(); | |
834 | } | |
835 | else if (pdef->second == sym) | |
836 | { | |
837 | // NAME/NULL already points to NAME/VERSION. Don't mark the | |
838 | // symbol as the default if it is not already the default. | |
839 | } | |
840 | else | |
841 | { | |
842 | // This is the unfortunate case where we already have entries | |
843 | // for both NAME/VERSION and NAME/NULL. We now see a symbol | |
844 | // NAME/VERSION where VERSION is the default version. We have | |
845 | // already resolved this new symbol with the existing | |
846 | // NAME/VERSION symbol. | |
847 | ||
848 | // It's possible that NAME/NULL and NAME/VERSION are both | |
849 | // defined in regular objects. This can only happen if one | |
850 | // object file defines foo and another defines foo@@ver. This | |
851 | // is somewhat obscure, but we call it a multiple definition | |
852 | // error. | |
853 | ||
854 | // It's possible that NAME/NULL actually has a version, in which | |
855 | // case it won't be the same as VERSION. This happens with | |
856 | // ver_test_7.so in the testsuite for the symbol t2_2. We see | |
857 | // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We | |
858 | // then see an unadorned t2_2 in an object file and give it | |
859 | // version VER1 from the version script. This looks like a | |
860 | // default definition for VER1, so it looks like we should merge | |
861 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's | |
862 | // not obvious that this is an error, either. So we just punt. | |
863 | ||
864 | // If one of the symbols has non-default visibility, and the | |
865 | // other is defined in a shared object, then they are different | |
866 | // symbols. | |
867 | ||
868 | // Otherwise, we just resolve the symbols as though they were | |
869 | // the same. | |
870 | ||
871 | if (pdef->second->version() != NULL) | |
872 | gold_assert(pdef->second->version() != sym->version()); | |
873 | else if (sym->visibility() != elfcpp::STV_DEFAULT | |
874 | && pdef->second->is_from_dynobj()) | |
875 | ; | |
876 | else if (pdef->second->visibility() != elfcpp::STV_DEFAULT | |
877 | && sym->is_from_dynobj()) | |
878 | ; | |
879 | else | |
880 | { | |
881 | const Sized_symbol<size>* symdef; | |
882 | symdef = this->get_sized_symbol<size>(pdef->second); | |
883 | Symbol_table::resolve<size, big_endian>(sym, symdef); | |
884 | this->make_forwarder(pdef->second, sym); | |
885 | pdef->second = sym; | |
886 | sym->set_is_default(); | |
887 | } | |
888 | } | |
889 | } | |
890 | ||
14bfc3f5 ILT |
891 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
892 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
893 | // whether this is the default version. ST_SHNDX is the symbol's |
894 | // section index; IS_ORDINARY is whether this is a normal section | |
895 | // rather than a special code. | |
14bfc3f5 | 896 | |
8781f709 ILT |
897 | // If IS_DEFAULT_VERSION is true, then this is the definition of a |
898 | // default version of a symbol. That means that any lookup of | |
899 | // NAME/NULL and any lookup of NAME/VERSION should always return the | |
900 | // same symbol. This is obvious for references, but in particular we | |
901 | // want to do this for definitions: overriding NAME/NULL should also | |
902 | // override NAME/VERSION. If we don't do that, it would be very hard | |
903 | // to override functions in a shared library which uses versioning. | |
14bfc3f5 ILT |
904 | |
905 | // We implement this by simply making both entries in the hash table | |
906 | // point to the same Symbol structure. That is easy enough if this is | |
907 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
908 | // that we have seen both already, in which case they will both have | |
909 | // independent entries in the symbol table. We can't simply change | |
910 | // the symbol table entry, because we have pointers to the entries | |
911 | // attached to the object files. So we mark the entry attached to the | |
912 | // object file as a forwarder, and record it in the forwarders_ map. | |
913 | // Note that entries in the hash table will never be marked as | |
914 | // forwarders. | |
70e654ba | 915 | // |
d491d34e ILT |
916 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
917 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
918 | // for a special section code. ST_SHNDX may be modified if the symbol | |
919 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
920 | |
921 | template<int size, bool big_endian> | |
aeddab66 | 922 | Sized_symbol<size>* |
2ea97941 | 923 | Symbol_table::add_from_object(Object* object, |
ca09d69a | 924 | const char* name, |
f0641a0b | 925 | Stringpool::Key name_key, |
ca09d69a | 926 | const char* version, |
f0641a0b | 927 | Stringpool::Key version_key, |
8781f709 | 928 | bool is_default_version, |
70e654ba | 929 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
930 | unsigned int st_shndx, |
931 | bool is_ordinary, | |
932 | unsigned int orig_st_shndx) | |
14bfc3f5 | 933 | { |
c5818ff1 | 934 | // Print a message if this symbol is being traced. |
2ea97941 | 935 | if (parameters->options().is_trace_symbol(name)) |
c5818ff1 | 936 | { |
d491d34e | 937 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
2ea97941 | 938 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
c5818ff1 | 939 | else |
2ea97941 | 940 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); |
c5818ff1 CC |
941 | } |
942 | ||
0864d551 ILT |
943 | // For an undefined symbol, we may need to adjust the name using |
944 | // --wrap. | |
d491d34e | 945 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 946 | && parameters->options().any_wrap()) |
0864d551 | 947 | { |
2ea97941 ILT |
948 | const char* wrap_name = this->wrap_symbol(name, &name_key); |
949 | if (wrap_name != name) | |
0864d551 ILT |
950 | { |
951 | // If we see a reference to malloc with version GLIBC_2.0, | |
952 | // and we turn it into a reference to __wrap_malloc, then we | |
953 | // discard the version number. Otherwise the user would be | |
954 | // required to specify the correct version for | |
955 | // __wrap_malloc. | |
2ea97941 | 956 | version = NULL; |
0864d551 | 957 | version_key = 0; |
2ea97941 | 958 | name = wrap_name; |
0864d551 ILT |
959 | } |
960 | } | |
961 | ||
14bfc3f5 ILT |
962 | Symbol* const snull = NULL; |
963 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
964 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
965 | snull)); | |
14bfc3f5 | 966 | |
8781f709 | 967 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
14bfc3f5 | 968 | std::make_pair(this->table_.end(), false); |
8781f709 | 969 | if (is_default_version) |
14bfc3f5 | 970 | { |
f0641a0b | 971 | const Stringpool::Key vnull_key = 0; |
8781f709 ILT |
972 | insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key, |
973 | vnull_key), | |
974 | snull)); | |
14bfc3f5 ILT |
975 | } |
976 | ||
977 | // ins.first: an iterator, which is a pointer to a pair. | |
978 | // ins.first->first: the key (a pair of name and version). | |
979 | // ins.first->second: the value (Symbol*). | |
980 | // ins.second: true if new entry was inserted, false if not. | |
981 | ||
1564db8d | 982 | Sized_symbol<size>* ret; |
ead1e424 ILT |
983 | bool was_undefined; |
984 | bool was_common; | |
14bfc3f5 ILT |
985 | if (!ins.second) |
986 | { | |
987 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 988 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 989 | gold_assert(ret != NULL); |
ead1e424 ILT |
990 | |
991 | was_undefined = ret->is_undefined(); | |
1707f183 CC |
992 | // Commons from plugins are just placeholders. |
993 | was_common = ret->is_common() && ret->object()->pluginobj() == NULL; | |
ead1e424 | 994 | |
2ea97941 | 995 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
b45e00b3 | 996 | version, is_default_version); |
6d03d481 ST |
997 | if (parameters->options().gc_sections()) |
998 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 | 999 | |
8781f709 ILT |
1000 | if (is_default_version) |
1001 | this->define_default_version<size, big_endian>(ret, insdefault.second, | |
1002 | insdefault.first); | |
3ac0a36c | 1003 | else |
b45e00b3 | 1004 | { |
b45e00b3 | 1005 | bool dummy; |
3ac0a36c CC |
1006 | if (version != NULL |
1007 | && ret->source() == Symbol::FROM_OBJECT | |
b45e00b3 CC |
1008 | && ret->object() == object |
1009 | && is_ordinary | |
3ac0a36c CC |
1010 | && ret->shndx(&dummy) == st_shndx |
1011 | && ret->is_default()) | |
b45e00b3 | 1012 | { |
3ac0a36c CC |
1013 | // We have seen NAME/VERSION already, and marked it as the |
1014 | // default version, but now we see a definition for | |
1015 | // NAME/VERSION that is not the default version. This can | |
1016 | // happen when the assembler generates two symbols for | |
1017 | // a symbol as a result of a ".symver foo,foo@VER" | |
1018 | // directive. We see the first unversioned symbol and | |
1019 | // we may mark it as the default version (from a | |
1020 | // version script); then we see the second versioned | |
1021 | // symbol and we need to override the first. | |
1022 | // In any other case, the two symbols should have generated | |
1023 | // a multiple definition error. | |
1024 | // (See PR gold/18703.) | |
b45e00b3 CC |
1025 | ret->set_is_not_default(); |
1026 | const Stringpool::Key vnull_key = 0; | |
1027 | this->table_.erase(std::make_pair(name_key, vnull_key)); | |
1028 | } | |
1029 | } | |
14bfc3f5 ILT |
1030 | } |
1031 | else | |
1032 | { | |
1033 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 1034 | gold_assert(ins.first->second == NULL); |
ead1e424 | 1035 | |
8781f709 | 1036 | if (is_default_version && !insdefault.second) |
14bfc3f5 | 1037 | { |
14b31740 ILT |
1038 | // We already have an entry for NAME/NULL. If we override |
1039 | // it, then change it to NAME/VERSION. | |
8781f709 | 1040 | ret = this->get_sized_symbol<size>(insdefault.first->second); |
18e6b24e ILT |
1041 | |
1042 | was_undefined = ret->is_undefined(); | |
1707f183 CC |
1043 | // Commons from plugins are just placeholders. |
1044 | was_common = ret->is_common() && ret->object()->pluginobj() == NULL; | |
18e6b24e | 1045 | |
2ea97941 | 1046 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
b45e00b3 | 1047 | version, is_default_version); |
6d03d481 ST |
1048 | if (parameters->options().gc_sections()) |
1049 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 ILT |
1050 | ins.first->second = ret; |
1051 | } | |
1052 | else | |
1053 | { | |
18e6b24e ILT |
1054 | was_undefined = false; |
1055 | was_common = false; | |
1056 | ||
f6ce93d6 | 1057 | Sized_target<size, big_endian>* target = |
029ba973 | 1058 | parameters->sized_target<size, big_endian>(); |
1564db8d ILT |
1059 | if (!target->has_make_symbol()) |
1060 | ret = new Sized_symbol<size>(); | |
1061 | else | |
14bfc3f5 | 1062 | { |
dc1c8a16 CC |
1063 | ret = target->make_symbol(name, sym.get_st_type(), object, |
1064 | st_shndx, sym.get_st_value()); | |
1564db8d | 1065 | if (ret == NULL) |
14bfc3f5 ILT |
1066 | { |
1067 | // This means that we don't want a symbol table | |
1068 | // entry after all. | |
8781f709 | 1069 | if (!is_default_version) |
14bfc3f5 ILT |
1070 | this->table_.erase(ins.first); |
1071 | else | |
1072 | { | |
8781f709 ILT |
1073 | this->table_.erase(insdefault.first); |
1074 | // Inserting INSDEFAULT invalidated INS. | |
f0641a0b ILT |
1075 | this->table_.erase(std::make_pair(name_key, |
1076 | version_key)); | |
14bfc3f5 ILT |
1077 | } |
1078 | return NULL; | |
1079 | } | |
1080 | } | |
14bfc3f5 | 1081 | |
2ea97941 | 1082 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 1083 | |
14bfc3f5 | 1084 | ins.first->second = ret; |
8781f709 | 1085 | if (is_default_version) |
14bfc3f5 ILT |
1086 | { |
1087 | // This is the first time we have seen NAME/NULL. Point | |
1088 | // it at the new entry for NAME/VERSION. | |
8781f709 ILT |
1089 | gold_assert(insdefault.second); |
1090 | insdefault.first->second = ret; | |
14bfc3f5 ILT |
1091 | } |
1092 | } | |
8c500701 | 1093 | |
8781f709 | 1094 | if (is_default_version) |
8c500701 | 1095 | ret->set_is_default(); |
14bfc3f5 ILT |
1096 | } |
1097 | ||
ead1e424 ILT |
1098 | // Record every time we see a new undefined symbol, to speed up |
1099 | // archive groups. | |
1100 | if (!was_undefined && ret->is_undefined()) | |
0f3b89d8 ILT |
1101 | { |
1102 | ++this->saw_undefined_; | |
1103 | if (parameters->options().has_plugins()) | |
1104 | parameters->options().plugins()->new_undefined_symbol(ret); | |
1105 | } | |
ead1e424 ILT |
1106 | |
1107 | // Keep track of common symbols, to speed up common symbol | |
1707f183 CC |
1108 | // allocation. Don't record commons from plugin objects; |
1109 | // we need to wait until we see the real symbol in the | |
1110 | // replacement file. | |
1111 | if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL) | |
155a0dd7 | 1112 | { |
8a5e3e08 | 1113 | if (ret->type() == elfcpp::STT_TLS) |
155a0dd7 | 1114 | this->tls_commons_.push_back(ret); |
8a5e3e08 ILT |
1115 | else if (!is_ordinary |
1116 | && st_shndx == parameters->target().small_common_shndx()) | |
1117 | this->small_commons_.push_back(ret); | |
1118 | else if (!is_ordinary | |
1119 | && st_shndx == parameters->target().large_common_shndx()) | |
1120 | this->large_commons_.push_back(ret); | |
1121 | else | |
1122 | this->commons_.push_back(ret); | |
155a0dd7 | 1123 | } |
ead1e424 | 1124 | |
0602e05a ILT |
1125 | // If we're not doing a relocatable link, then any symbol with |
1126 | // hidden or internal visibility is local. | |
1127 | if ((ret->visibility() == elfcpp::STV_HIDDEN | |
1128 | || ret->visibility() == elfcpp::STV_INTERNAL) | |
1129 | && (ret->binding() == elfcpp::STB_GLOBAL | |
adcf2816 | 1130 | || ret->binding() == elfcpp::STB_GNU_UNIQUE |
0602e05a ILT |
1131 | || ret->binding() == elfcpp::STB_WEAK) |
1132 | && !parameters->options().relocatable()) | |
1133 | this->force_local(ret); | |
1134 | ||
14bfc3f5 ILT |
1135 | return ret; |
1136 | } | |
1137 | ||
f6ce93d6 | 1138 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
1139 | |
1140 | template<int size, bool big_endian> | |
1141 | void | |
dbe717ef | 1142 | Symbol_table::add_from_relobj( |
6fa2a40b | 1143 | Sized_relobj_file<size, big_endian>* relobj, |
f6ce93d6 | 1144 | const unsigned char* syms, |
14bfc3f5 | 1145 | size_t count, |
d491d34e | 1146 | size_t symndx_offset, |
14bfc3f5 ILT |
1147 | const char* sym_names, |
1148 | size_t sym_name_size, | |
6fa2a40b | 1149 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
ca09d69a | 1150 | size_t* defined) |
14bfc3f5 | 1151 | { |
92de84a6 ILT |
1152 | *defined = 0; |
1153 | ||
8851ecca | 1154 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 1155 | |
a783673b ILT |
1156 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
1157 | ||
88dd47ac ILT |
1158 | const bool just_symbols = relobj->just_symbols(); |
1159 | ||
f6ce93d6 | 1160 | const unsigned char* p = syms; |
a783673b | 1161 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 1162 | { |
92de84a6 ILT |
1163 | (*sympointers)[i] = NULL; |
1164 | ||
14bfc3f5 ILT |
1165 | elfcpp::Sym<size, big_endian> sym(p); |
1166 | ||
d491d34e | 1167 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
1168 | if (st_name >= sym_name_size) |
1169 | { | |
75f2446e ILT |
1170 | relobj->error(_("bad global symbol name offset %u at %zu"), |
1171 | st_name, i); | |
1172 | continue; | |
14bfc3f5 ILT |
1173 | } |
1174 | ||
2ea97941 | 1175 | const char* name = sym_names + st_name; |
dbe717ef | 1176 | |
bebf4942 L |
1177 | if (!parameters->options().relocatable() |
1178 | && strcmp (name, "__gnu_lto_slim") == 0) | |
7cd4e5b7 AM |
1179 | gold_info(_("%s: plugin needed to handle lto object"), |
1180 | relobj->name().c_str()); | |
1181 | ||
d491d34e ILT |
1182 | bool is_ordinary; |
1183 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
1184 | sym.get_st_shndx(), | |
1185 | &is_ordinary); | |
1186 | unsigned int orig_st_shndx = st_shndx; | |
1187 | if (!is_ordinary) | |
1188 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
1189 | ||
92de84a6 ILT |
1190 | if (st_shndx != elfcpp::SHN_UNDEF) |
1191 | ++*defined; | |
1192 | ||
a783673b ILT |
1193 | // A symbol defined in a section which we are not including must |
1194 | // be treated as an undefined symbol. | |
880cd20d | 1195 | bool is_defined_in_discarded_section = false; |
a783673b | 1196 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 1197 | && is_ordinary |
ce97fa81 ST |
1198 | && !relobj->is_section_included(st_shndx) |
1199 | && !this->is_section_folded(relobj, st_shndx)) | |
880cd20d ILT |
1200 | { |
1201 | st_shndx = elfcpp::SHN_UNDEF; | |
1202 | is_defined_in_discarded_section = true; | |
1203 | } | |
a783673b | 1204 | |
14bfc3f5 ILT |
1205 | // In an object file, an '@' in the name separates the symbol |
1206 | // name from the version name. If there are two '@' characters, | |
1207 | // this is the default version. | |
2ea97941 | 1208 | const char* ver = strchr(name, '@'); |
057ead22 | 1209 | Stringpool::Key ver_key = 0; |
09124467 | 1210 | int namelen = 0; |
8781f709 ILT |
1211 | // IS_DEFAULT_VERSION: is the version default? |
1212 | // IS_FORCED_LOCAL: is the symbol forced local? | |
1213 | bool is_default_version = false; | |
1214 | bool is_forced_local = false; | |
09124467 | 1215 | |
a7dac153 CC |
1216 | // FIXME: For incremental links, we don't store version information, |
1217 | // so we need to ignore version symbols for now. | |
1218 | if (parameters->incremental_update() && ver != NULL) | |
1219 | { | |
1220 | namelen = ver - name; | |
1221 | ver = NULL; | |
1222 | } | |
1223 | ||
09124467 ILT |
1224 | if (ver != NULL) |
1225 | { | |
1226 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
2ea97941 | 1227 | namelen = ver - name; |
09124467 ILT |
1228 | ++ver; |
1229 | if (*ver == '@') | |
1230 | { | |
8781f709 | 1231 | is_default_version = true; |
09124467 ILT |
1232 | ++ver; |
1233 | } | |
057ead22 | 1234 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 1235 | } |
5871526f ILT |
1236 | // We don't want to assign a version to an undefined symbol, |
1237 | // even if it is listed in the version script. FIXME: What | |
1238 | // about a common symbol? | |
057ead22 ILT |
1239 | else |
1240 | { | |
2ea97941 | 1241 | namelen = strlen(name); |
057ead22 ILT |
1242 | if (!this->version_script_.empty() |
1243 | && st_shndx != elfcpp::SHN_UNDEF) | |
1244 | { | |
1245 | // The symbol name did not have a version, but the | |
1246 | // version script may assign a version anyway. | |
2ea97941 | 1247 | std::string version; |
98e090bd ILT |
1248 | bool is_global; |
1249 | if (this->version_script_.get_symbol_version(name, &version, | |
1250 | &is_global)) | |
057ead22 | 1251 | { |
98e090bd ILT |
1252 | if (!is_global) |
1253 | is_forced_local = true; | |
1254 | else if (!version.empty()) | |
057ead22 | 1255 | { |
2ea97941 ILT |
1256 | ver = this->namepool_.add_with_length(version.c_str(), |
1257 | version.length(), | |
057ead22 ILT |
1258 | true, |
1259 | &ver_key); | |
8781f709 | 1260 | is_default_version = true; |
057ead22 ILT |
1261 | } |
1262 | } | |
057ead22 ILT |
1263 | } |
1264 | } | |
14bfc3f5 | 1265 | |
d491d34e ILT |
1266 | elfcpp::Sym<size, big_endian>* psym = &sym; |
1267 | unsigned char symbuf[sym_size]; | |
1268 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
1269 | if (just_symbols) |
1270 | { | |
d491d34e | 1271 | memcpy(symbuf, p, sym_size); |
88dd47ac | 1272 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
9590bf25 CC |
1273 | if (orig_st_shndx != elfcpp::SHN_UNDEF |
1274 | && is_ordinary | |
1275 | && relobj->e_type() == elfcpp::ET_REL) | |
88dd47ac | 1276 | { |
9590bf25 CC |
1277 | // Symbol values in relocatable object files are section |
1278 | // relative. This is normally what we want, but since here | |
1279 | // we are converting the symbol to absolute we need to add | |
1280 | // the section address. The section address in an object | |
88dd47ac ILT |
1281 | // file is normally zero, but people can use a linker |
1282 | // script to change it. | |
d491d34e ILT |
1283 | sw.put_st_value(sym.get_st_value() |
1284 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 1285 | } |
d491d34e ILT |
1286 | st_shndx = elfcpp::SHN_ABS; |
1287 | is_ordinary = false; | |
88dd47ac ILT |
1288 | psym = &sym2; |
1289 | } | |
1290 | ||
65514900 | 1291 | // Fix up visibility if object has no-export set. |
1c74fab0 ILT |
1292 | if (relobj->no_export() |
1293 | && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary)) | |
65514900 CC |
1294 | { |
1295 | // We may have copied symbol already above. | |
1296 | if (psym != &sym2) | |
1297 | { | |
1298 | memcpy(symbuf, p, sym_size); | |
1299 | psym = &sym2; | |
1300 | } | |
1301 | ||
1302 | elfcpp::STV visibility = sym2.get_st_visibility(); | |
1303 | if (visibility == elfcpp::STV_DEFAULT | |
1304 | || visibility == elfcpp::STV_PROTECTED) | |
1305 | { | |
1306 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1307 | unsigned char nonvis = sym2.get_st_nonvis(); | |
1308 | sw.put_st_other(elfcpp::STV_HIDDEN, nonvis); | |
1309 | } | |
1310 | } | |
1311 | ||
057ead22 | 1312 | Stringpool::Key name_key; |
2ea97941 | 1313 | name = this->namepool_.add_with_length(name, namelen, true, |
057ead22 ILT |
1314 | &name_key); |
1315 | ||
aeddab66 | 1316 | Sized_symbol<size>* res; |
2ea97941 | 1317 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
8781f709 ILT |
1318 | is_default_version, *psym, st_shndx, |
1319 | is_ordinary, orig_st_shndx); | |
6d03d481 | 1320 | |
804eb480 ST |
1321 | if (is_forced_local) |
1322 | this->force_local(res); | |
1323 | ||
7257cc92 ST |
1324 | // Do not treat this symbol as garbage if this symbol will be |
1325 | // exported to the dynamic symbol table. This is true when | |
1326 | // building a shared library or using --export-dynamic and | |
1327 | // the symbol is externally visible. | |
1328 | if (parameters->options().gc_sections() | |
1329 | && res->is_externally_visible() | |
1330 | && !res->is_from_dynobj() | |
1331 | && (parameters->options().shared() | |
fd834e57 CC |
1332 | || parameters->options().export_dynamic() |
1333 | || parameters->options().in_dynamic_list(res->name()))) | |
7257cc92 | 1334 | this->gc_mark_symbol(res); |
f0641a0b | 1335 | |
880cd20d ILT |
1336 | if (is_defined_in_discarded_section) |
1337 | res->set_is_defined_in_discarded_section(); | |
1338 | ||
730cdc88 | 1339 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
1340 | } |
1341 | } | |
1342 | ||
89fc3421 CC |
1343 | // Add a symbol from a plugin-claimed file. |
1344 | ||
1345 | template<int size, bool big_endian> | |
1346 | Symbol* | |
1347 | Symbol_table::add_from_pluginobj( | |
1348 | Sized_pluginobj<size, big_endian>* obj, | |
2ea97941 | 1349 | const char* name, |
89fc3421 CC |
1350 | const char* ver, |
1351 | elfcpp::Sym<size, big_endian>* sym) | |
1352 | { | |
1353 | unsigned int st_shndx = sym->get_st_shndx(); | |
24998053 | 1354 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
89fc3421 CC |
1355 | |
1356 | Stringpool::Key ver_key = 0; | |
8781f709 ILT |
1357 | bool is_default_version = false; |
1358 | bool is_forced_local = false; | |
89fc3421 CC |
1359 | |
1360 | if (ver != NULL) | |
1361 | { | |
1362 | ver = this->namepool_.add(ver, true, &ver_key); | |
1363 | } | |
1364 | // We don't want to assign a version to an undefined symbol, | |
1365 | // even if it is listed in the version script. FIXME: What | |
1366 | // about a common symbol? | |
1367 | else | |
1368 | { | |
1369 | if (!this->version_script_.empty() | |
1370 | && st_shndx != elfcpp::SHN_UNDEF) | |
1371 | { | |
1372 | // The symbol name did not have a version, but the | |
1373 | // version script may assign a version anyway. | |
2ea97941 | 1374 | std::string version; |
98e090bd ILT |
1375 | bool is_global; |
1376 | if (this->version_script_.get_symbol_version(name, &version, | |
1377 | &is_global)) | |
89fc3421 | 1378 | { |
98e090bd ILT |
1379 | if (!is_global) |
1380 | is_forced_local = true; | |
1381 | else if (!version.empty()) | |
89fc3421 | 1382 | { |
2ea97941 ILT |
1383 | ver = this->namepool_.add_with_length(version.c_str(), |
1384 | version.length(), | |
89fc3421 CC |
1385 | true, |
1386 | &ver_key); | |
8781f709 | 1387 | is_default_version = true; |
89fc3421 CC |
1388 | } |
1389 | } | |
89fc3421 CC |
1390 | } |
1391 | } | |
1392 | ||
1393 | Stringpool::Key name_key; | |
2ea97941 | 1394 | name = this->namepool_.add(name, true, &name_key); |
89fc3421 CC |
1395 | |
1396 | Sized_symbol<size>* res; | |
2ea97941 | 1397 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
8781f709 ILT |
1398 | is_default_version, *sym, st_shndx, |
1399 | is_ordinary, st_shndx); | |
89fc3421 | 1400 | |
8781f709 | 1401 | if (is_forced_local) |
0602e05a | 1402 | this->force_local(res); |
89fc3421 CC |
1403 | |
1404 | return res; | |
1405 | } | |
1406 | ||
dbe717ef ILT |
1407 | // Add all the symbols in a dynamic object to the hash table. |
1408 | ||
1409 | template<int size, bool big_endian> | |
1410 | void | |
1411 | Symbol_table::add_from_dynobj( | |
1412 | Sized_dynobj<size, big_endian>* dynobj, | |
1413 | const unsigned char* syms, | |
1414 | size_t count, | |
1415 | const char* sym_names, | |
1416 | size_t sym_name_size, | |
1417 | const unsigned char* versym, | |
1418 | size_t versym_size, | |
92de84a6 | 1419 | const std::vector<const char*>* version_map, |
6fa2a40b | 1420 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
92de84a6 | 1421 | size_t* defined) |
dbe717ef | 1422 | { |
92de84a6 ILT |
1423 | *defined = 0; |
1424 | ||
8851ecca | 1425 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1426 | |
88dd47ac ILT |
1427 | if (dynobj->just_symbols()) |
1428 | { | |
1429 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1430 | return; | |
1431 | } | |
1432 | ||
a7dac153 CC |
1433 | // FIXME: For incremental links, we don't store version information, |
1434 | // so we need to ignore version symbols for now. | |
1435 | if (parameters->incremental_update()) | |
1436 | versym = NULL; | |
1437 | ||
dbe717ef ILT |
1438 | if (versym != NULL && versym_size / 2 < count) |
1439 | { | |
75f2446e ILT |
1440 | dynobj->error(_("too few symbol versions")); |
1441 | return; | |
dbe717ef ILT |
1442 | } |
1443 | ||
1444 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1445 | ||
aeddab66 ILT |
1446 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1447 | // weak aliases. This is necessary because if the dynamic object | |
1448 | // provides the same variable under two names, one of which is a | |
1449 | // weak definition, and the regular object refers to the weak | |
1450 | // definition, we have to put both the weak definition and the | |
1451 | // strong definition into the dynamic symbol table. Given a weak | |
1452 | // definition, the only way that we can find the corresponding | |
1453 | // strong definition, if any, is to search the symbol table. | |
1454 | std::vector<Sized_symbol<size>*> object_symbols; | |
1455 | ||
dbe717ef ILT |
1456 | const unsigned char* p = syms; |
1457 | const unsigned char* vs = versym; | |
1458 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1459 | { | |
1460 | elfcpp::Sym<size, big_endian> sym(p); | |
1461 | ||
92de84a6 ILT |
1462 | if (sympointers != NULL) |
1463 | (*sympointers)[i] = NULL; | |
1464 | ||
65778909 ILT |
1465 | // Ignore symbols with local binding or that have |
1466 | // internal or hidden visibility. | |
1467 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1468 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1469 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1470 | continue; |
1471 | ||
8bdcdf2c ILT |
1472 | // A protected symbol in a shared library must be treated as a |
1473 | // normal symbol when viewed from outside the shared library. | |
1474 | // Implement this by overriding the visibility here. | |
3d4fde69 CC |
1475 | // Likewise, an IFUNC symbol in a shared library must be treated |
1476 | // as a normal FUNC symbol. | |
8bdcdf2c ILT |
1477 | elfcpp::Sym<size, big_endian>* psym = &sym; |
1478 | unsigned char symbuf[sym_size]; | |
1479 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
3d4fde69 CC |
1480 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED |
1481 | || sym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
8bdcdf2c ILT |
1482 | { |
1483 | memcpy(symbuf, p, sym_size); | |
1484 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
3d4fde69 CC |
1485 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) |
1486 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1487 | if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1488 | sw.put_st_info(sym.get_st_bind(), elfcpp::STT_FUNC); | |
8bdcdf2c ILT |
1489 | psym = &sym2; |
1490 | } | |
1491 | ||
1492 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1493 | if (st_name >= sym_name_size) |
1494 | { | |
75f2446e ILT |
1495 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1496 | st_name, i); | |
1497 | continue; | |
dbe717ef ILT |
1498 | } |
1499 | ||
2ea97941 | 1500 | const char* name = sym_names + st_name; |
dbe717ef | 1501 | |
d491d34e | 1502 | bool is_ordinary; |
8bdcdf2c | 1503 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1504 | &is_ordinary); |
1505 | ||
92de84a6 ILT |
1506 | if (st_shndx != elfcpp::SHN_UNDEF) |
1507 | ++*defined; | |
1508 | ||
aeddab66 ILT |
1509 | Sized_symbol<size>* res; |
1510 | ||
dbe717ef ILT |
1511 | if (versym == NULL) |
1512 | { | |
1513 | Stringpool::Key name_key; | |
2ea97941 ILT |
1514 | name = this->namepool_.add(name, true, &name_key); |
1515 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1516 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1517 | st_shndx); |
dbe717ef | 1518 | } |
aeddab66 ILT |
1519 | else |
1520 | { | |
1521 | // Read the version information. | |
dbe717ef | 1522 | |
aeddab66 | 1523 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1524 | |
aeddab66 ILT |
1525 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1526 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1527 | |
aeddab66 ILT |
1528 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1529 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1530 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1531 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1532 | // for an undefined symbol. I don't know what the Sun | |
1533 | // linker will generate. | |
dbe717ef | 1534 | |
aeddab66 | 1535 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1536 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1537 | { |
1538 | // This symbol should not be visible outside the object. | |
1539 | continue; | |
1540 | } | |
64707334 | 1541 | |
aeddab66 ILT |
1542 | // At this point we are definitely going to add this symbol. |
1543 | Stringpool::Key name_key; | |
2ea97941 | 1544 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 1545 | |
aeddab66 ILT |
1546 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1547 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1548 | { | |
1549 | // This symbol does not have a version. | |
2ea97941 | 1550 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1551 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1552 | st_shndx); |
aeddab66 ILT |
1553 | } |
1554 | else | |
1555 | { | |
1556 | if (v >= version_map->size()) | |
1557 | { | |
1558 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1559 | i, v); | |
1560 | continue; | |
1561 | } | |
dbe717ef | 1562 | |
2ea97941 ILT |
1563 | const char* version = (*version_map)[v]; |
1564 | if (version == NULL) | |
aeddab66 ILT |
1565 | { |
1566 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1567 | i, v); | |
1568 | continue; | |
1569 | } | |
dbe717ef | 1570 | |
aeddab66 | 1571 | Stringpool::Key version_key; |
2ea97941 | 1572 | version = this->namepool_.add(version, true, &version_key); |
aeddab66 ILT |
1573 | |
1574 | // If this is an absolute symbol, and the version name | |
1575 | // and symbol name are the same, then this is the | |
1576 | // version definition symbol. These symbols exist to | |
1577 | // support using -u to pull in particular versions. We | |
1578 | // do not want to record a version for them. | |
d491d34e ILT |
1579 | if (st_shndx == elfcpp::SHN_ABS |
1580 | && !is_ordinary | |
aeddab66 | 1581 | && name_key == version_key) |
2ea97941 | 1582 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1583 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1584 | st_shndx); |
aeddab66 ILT |
1585 | else |
1586 | { | |
8781f709 ILT |
1587 | const bool is_default_version = |
1588 | !hidden && st_shndx != elfcpp::SHN_UNDEF; | |
2ea97941 | 1589 | res = this->add_from_object(dynobj, name, name_key, version, |
8781f709 ILT |
1590 | version_key, is_default_version, |
1591 | *psym, st_shndx, | |
d491d34e | 1592 | is_ordinary, st_shndx); |
aeddab66 ILT |
1593 | } |
1594 | } | |
dbe717ef ILT |
1595 | } |
1596 | ||
99a37bfd | 1597 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1598 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1599 | if (st_shndx != elfcpp::SHN_UNDEF |
1600 | && is_ordinary | |
8bdcdf2c | 1601 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1602 | && res->source() == Symbol::FROM_OBJECT |
1603 | && res->object() == dynobj) | |
aeddab66 | 1604 | object_symbols.push_back(res); |
92de84a6 ILT |
1605 | |
1606 | if (sympointers != NULL) | |
1607 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1608 | } |
1609 | ||
1610 | this->record_weak_aliases(&object_symbols); | |
1611 | } | |
1612 | ||
cdc29364 CC |
1613 | // Add a symbol from a incremental object file. |
1614 | ||
1615 | template<int size, bool big_endian> | |
26d3c67d | 1616 | Sized_symbol<size>* |
cdc29364 CC |
1617 | Symbol_table::add_from_incrobj( |
1618 | Object* obj, | |
1619 | const char* name, | |
1620 | const char* ver, | |
1621 | elfcpp::Sym<size, big_endian>* sym) | |
1622 | { | |
1623 | unsigned int st_shndx = sym->get_st_shndx(); | |
1624 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; | |
1625 | ||
1626 | Stringpool::Key ver_key = 0; | |
1627 | bool is_default_version = false; | |
1628 | bool is_forced_local = false; | |
1629 | ||
1630 | Stringpool::Key name_key; | |
1631 | name = this->namepool_.add(name, true, &name_key); | |
1632 | ||
1633 | Sized_symbol<size>* res; | |
1634 | res = this->add_from_object(obj, name, name_key, ver, ver_key, | |
1635 | is_default_version, *sym, st_shndx, | |
1636 | is_ordinary, st_shndx); | |
1637 | ||
1638 | if (is_forced_local) | |
1639 | this->force_local(res); | |
1640 | ||
1641 | return res; | |
1642 | } | |
1643 | ||
aeddab66 ILT |
1644 | // This is used to sort weak aliases. We sort them first by section |
1645 | // index, then by offset, then by weak ahead of strong. | |
1646 | ||
1647 | template<int size> | |
1648 | class Weak_alias_sorter | |
1649 | { | |
1650 | public: | |
1651 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1652 | }; | |
1653 | ||
1654 | template<int size> | |
1655 | bool | |
1656 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1657 | const Sized_symbol<size>* s2) const | |
1658 | { | |
d491d34e ILT |
1659 | bool is_ordinary; |
1660 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1661 | gold_assert(is_ordinary); | |
1662 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1663 | gold_assert(is_ordinary); | |
1664 | if (s1_shndx != s2_shndx) | |
1665 | return s1_shndx < s2_shndx; | |
1666 | ||
aeddab66 ILT |
1667 | if (s1->value() != s2->value()) |
1668 | return s1->value() < s2->value(); | |
1669 | if (s1->binding() != s2->binding()) | |
1670 | { | |
1671 | if (s1->binding() == elfcpp::STB_WEAK) | |
1672 | return true; | |
1673 | if (s2->binding() == elfcpp::STB_WEAK) | |
1674 | return false; | |
1675 | } | |
1676 | return std::string(s1->name()) < std::string(s2->name()); | |
1677 | } | |
dbe717ef | 1678 | |
aeddab66 ILT |
1679 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1680 | // for any weak aliases, and record them so that if we add the weak | |
1681 | // alias to the dynamic symbol table, we also add the corresponding | |
1682 | // strong symbol. | |
dbe717ef | 1683 | |
aeddab66 ILT |
1684 | template<int size> |
1685 | void | |
1686 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1687 | { | |
1688 | // Sort the vector by section index, then by offset, then by weak | |
1689 | // ahead of strong. | |
1690 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1691 | ||
1692 | // Walk through the vector. For each weak definition, record | |
1693 | // aliases. | |
1694 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1695 | symbols->begin(); | |
1696 | p != symbols->end(); | |
1697 | ++p) | |
1698 | { | |
1699 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1700 | continue; | |
1701 | ||
1702 | // Build a circular list of weak aliases. Each symbol points to | |
1703 | // the next one in the circular list. | |
1704 | ||
1705 | Sized_symbol<size>* from_sym = *p; | |
1706 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1707 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1708 | { |
d491d34e ILT |
1709 | bool dummy; |
1710 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1711 | || (*q)->value() != from_sym->value()) |
1712 | break; | |
1713 | ||
1714 | this->weak_aliases_[from_sym] = *q; | |
1715 | from_sym->set_has_alias(); | |
1716 | from_sym = *q; | |
dbe717ef ILT |
1717 | } |
1718 | ||
aeddab66 ILT |
1719 | if (from_sym != *p) |
1720 | { | |
1721 | this->weak_aliases_[from_sym] = *p; | |
1722 | from_sym->set_has_alias(); | |
1723 | } | |
dbe717ef | 1724 | |
aeddab66 | 1725 | p = q - 1; |
dbe717ef ILT |
1726 | } |
1727 | } | |
1728 | ||
ead1e424 ILT |
1729 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1730 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1731 | // If this does not return NULL, it sets *POLDSYM to the existing |
8c500701 ILT |
1732 | // symbol if there is one. This sets *RESOLVE_OLDSYM if we should |
1733 | // resolve the newly created symbol to the old one. This | |
1734 | // canonicalizes *PNAME and *PVERSION. | |
ead1e424 ILT |
1735 | |
1736 | template<int size, bool big_endian> | |
1737 | Sized_symbol<size>* | |
9b07f471 ILT |
1738 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1739 | bool only_if_ref, | |
8c500701 | 1740 | Sized_symbol<size>** poldsym, |
ca09d69a | 1741 | bool* resolve_oldsym) |
ead1e424 | 1742 | { |
8c500701 | 1743 | *resolve_oldsym = false; |
8cc69fb6 | 1744 | *poldsym = NULL; |
ead1e424 | 1745 | |
55a93433 ILT |
1746 | // If the caller didn't give us a version, see if we get one from |
1747 | // the version script. | |
057ead22 | 1748 | std::string v; |
8c500701 | 1749 | bool is_default_version = false; |
55a93433 ILT |
1750 | if (*pversion == NULL) |
1751 | { | |
98e090bd ILT |
1752 | bool is_global; |
1753 | if (this->version_script_.get_symbol_version(*pname, &v, &is_global)) | |
057ead22 | 1754 | { |
98e090bd ILT |
1755 | if (is_global && !v.empty()) |
1756 | { | |
1757 | *pversion = v.c_str(); | |
1758 | // If we get the version from a version script, then we | |
1759 | // are also the default version. | |
1760 | is_default_version = true; | |
1761 | } | |
057ead22 | 1762 | } |
55a93433 ILT |
1763 | } |
1764 | ||
8c500701 ILT |
1765 | Symbol* oldsym; |
1766 | Sized_symbol<size>* sym; | |
1767 | ||
1768 | bool add_to_table = false; | |
1769 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
1770 | bool add_def_to_table = false; | |
1771 | typename Symbol_table_type::iterator add_def_loc = this->table_.end(); | |
1772 | ||
ead1e424 ILT |
1773 | if (only_if_ref) |
1774 | { | |
306d9ef0 | 1775 | oldsym = this->lookup(*pname, *pversion); |
8c500701 ILT |
1776 | if (oldsym == NULL && is_default_version) |
1777 | oldsym = this->lookup(*pname, NULL); | |
f6ce93d6 | 1778 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1779 | return NULL; |
306d9ef0 ILT |
1780 | |
1781 | *pname = oldsym->name(); | |
eebd87a5 ILT |
1782 | if (is_default_version) |
1783 | *pversion = this->namepool_.add(*pversion, true, NULL); | |
1784 | else | |
8c500701 | 1785 | *pversion = oldsym->version(); |
ead1e424 ILT |
1786 | } |
1787 | else | |
1788 | { | |
14b31740 | 1789 | // Canonicalize NAME and VERSION. |
f0641a0b | 1790 | Stringpool::Key name_key; |
cfd73a4e | 1791 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1792 | |
14b31740 | 1793 | Stringpool::Key version_key = 0; |
306d9ef0 | 1794 | if (*pversion != NULL) |
cfd73a4e | 1795 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1796 | |
ead1e424 | 1797 | Symbol* const snull = NULL; |
ead1e424 | 1798 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1799 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1800 | version_key), | |
ead1e424 ILT |
1801 | snull)); |
1802 | ||
8781f709 | 1803 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
8c500701 ILT |
1804 | std::make_pair(this->table_.end(), false); |
1805 | if (is_default_version) | |
1806 | { | |
1807 | const Stringpool::Key vnull = 0; | |
8781f709 ILT |
1808 | insdefault = |
1809 | this->table_.insert(std::make_pair(std::make_pair(name_key, | |
1810 | vnull), | |
1811 | snull)); | |
8c500701 ILT |
1812 | } |
1813 | ||
ead1e424 ILT |
1814 | if (!ins.second) |
1815 | { | |
14b31740 | 1816 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1817 | oldsym = ins.first->second; |
a3ad94ed | 1818 | gold_assert(oldsym != NULL); |
8c500701 ILT |
1819 | |
1820 | if (is_default_version) | |
1821 | { | |
1822 | Sized_symbol<size>* soldsym = | |
1823 | this->get_sized_symbol<size>(oldsym); | |
1824 | this->define_default_version<size, big_endian>(soldsym, | |
8781f709 ILT |
1825 | insdefault.second, |
1826 | insdefault.first); | |
8c500701 | 1827 | } |
ead1e424 ILT |
1828 | } |
1829 | else | |
1830 | { | |
1831 | // We haven't seen this symbol before. | |
a3ad94ed | 1832 | gold_assert(ins.first->second == NULL); |
8c500701 ILT |
1833 | |
1834 | add_to_table = true; | |
1835 | add_loc = ins.first; | |
1836 | ||
8781f709 | 1837 | if (is_default_version && !insdefault.second) |
8c500701 ILT |
1838 | { |
1839 | // We are adding NAME/VERSION, and it is the default | |
1840 | // version. We already have an entry for NAME/NULL. | |
8781f709 | 1841 | oldsym = insdefault.first->second; |
8c500701 ILT |
1842 | *resolve_oldsym = true; |
1843 | } | |
1844 | else | |
1845 | { | |
1846 | oldsym = NULL; | |
1847 | ||
1848 | if (is_default_version) | |
1849 | { | |
1850 | add_def_to_table = true; | |
8781f709 | 1851 | add_def_loc = insdefault.first; |
8c500701 ILT |
1852 | } |
1853 | } | |
ead1e424 ILT |
1854 | } |
1855 | } | |
1856 | ||
8851ecca ILT |
1857 | const Target& target = parameters->target(); |
1858 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1859 | sym = new Sized_symbol<size>(); |
1860 | else | |
ead1e424 | 1861 | { |
029ba973 ILT |
1862 | Sized_target<size, big_endian>* sized_target = |
1863 | parameters->sized_target<size, big_endian>(); | |
dc1c8a16 CC |
1864 | sym = sized_target->make_symbol(*pname, elfcpp::STT_NOTYPE, |
1865 | NULL, elfcpp::SHN_UNDEF, 0); | |
86f2e683 ILT |
1866 | if (sym == NULL) |
1867 | return NULL; | |
1868 | } | |
ead1e424 | 1869 | |
86f2e683 ILT |
1870 | if (add_to_table) |
1871 | add_loc->second = sym; | |
1872 | else | |
1873 | gold_assert(oldsym != NULL); | |
ead1e424 | 1874 | |
8c500701 ILT |
1875 | if (add_def_to_table) |
1876 | add_def_loc->second = sym; | |
1877 | ||
7d1a9ebb | 1878 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1879 | |
1880 | return sym; | |
1881 | } | |
1882 | ||
1883 | // Define a symbol based on an Output_data. | |
1884 | ||
14b31740 | 1885 | Symbol* |
2ea97941 ILT |
1886 | Symbol_table::define_in_output_data(const char* name, |
1887 | const char* version, | |
99fff23b | 1888 | Defined defined, |
9b07f471 | 1889 | Output_data* od, |
2ea97941 ILT |
1890 | uint64_t value, |
1891 | uint64_t symsize, | |
9b07f471 ILT |
1892 | elfcpp::STT type, |
1893 | elfcpp::STB binding, | |
ead1e424 ILT |
1894 | elfcpp::STV visibility, |
1895 | unsigned char nonvis, | |
2ea97941 | 1896 | bool offset_is_from_end, |
ead1e424 ILT |
1897 | bool only_if_ref) |
1898 | { | |
8851ecca | 1899 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1900 | { |
1901 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1902 | return this->do_define_in_output_data<32>(name, version, defined, od, |
2ea97941 | 1903 | value, symsize, type, binding, |
86f2e683 | 1904 | visibility, nonvis, |
2ea97941 | 1905 | offset_is_from_end, |
86f2e683 ILT |
1906 | only_if_ref); |
1907 | #else | |
1908 | gold_unreachable(); | |
1909 | #endif | |
1910 | } | |
8851ecca | 1911 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1912 | { |
1913 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1914 | return this->do_define_in_output_data<64>(name, version, defined, od, |
2ea97941 | 1915 | value, symsize, type, binding, |
86f2e683 | 1916 | visibility, nonvis, |
2ea97941 | 1917 | offset_is_from_end, |
86f2e683 ILT |
1918 | only_if_ref); |
1919 | #else | |
1920 | gold_unreachable(); | |
1921 | #endif | |
1922 | } | |
ead1e424 | 1923 | else |
a3ad94ed | 1924 | gold_unreachable(); |
ead1e424 ILT |
1925 | } |
1926 | ||
1927 | // Define a symbol in an Output_data, sized version. | |
1928 | ||
1929 | template<int size> | |
14b31740 | 1930 | Sized_symbol<size>* |
ead1e424 | 1931 | Symbol_table::do_define_in_output_data( |
2ea97941 ILT |
1932 | const char* name, |
1933 | const char* version, | |
99fff23b | 1934 | Defined defined, |
ead1e424 | 1935 | Output_data* od, |
2ea97941 ILT |
1936 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1937 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1938 | elfcpp::STT type, |
1939 | elfcpp::STB binding, | |
1940 | elfcpp::STV visibility, | |
1941 | unsigned char nonvis, | |
2ea97941 | 1942 | bool offset_is_from_end, |
ead1e424 ILT |
1943 | bool only_if_ref) |
1944 | { | |
1945 | Sized_symbol<size>* sym; | |
86f2e683 | 1946 | Sized_symbol<size>* oldsym; |
8c500701 | 1947 | bool resolve_oldsym; |
ead1e424 | 1948 | |
8851ecca | 1949 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1950 | { |
1951 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1952 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1953 | only_if_ref, &oldsym, |
1954 | &resolve_oldsym); | |
193a53d9 ILT |
1955 | #else |
1956 | gold_unreachable(); | |
1957 | #endif | |
1958 | } | |
ead1e424 | 1959 | else |
193a53d9 ILT |
1960 | { |
1961 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1962 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1963 | only_if_ref, &oldsym, |
1964 | &resolve_oldsym); | |
193a53d9 ILT |
1965 | #else |
1966 | gold_unreachable(); | |
1967 | #endif | |
1968 | } | |
ead1e424 ILT |
1969 | |
1970 | if (sym == NULL) | |
14b31740 | 1971 | return NULL; |
ead1e424 | 1972 | |
2ea97941 | 1973 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
5146f448 CC |
1974 | visibility, nonvis, offset_is_from_end, |
1975 | defined == PREDEFINED); | |
14b31740 | 1976 | |
e5756efb | 1977 | if (oldsym == NULL) |
55a93433 ILT |
1978 | { |
1979 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1980 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1981 | this->force_local(sym); |
2ea97941 | 1982 | else if (version != NULL) |
75517b77 | 1983 | sym->set_is_default(); |
55a93433 ILT |
1984 | return sym; |
1985 | } | |
86f2e683 | 1986 | |
62855347 | 1987 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 1988 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1989 | |
1990 | if (resolve_oldsym) | |
1991 | return sym; | |
1992 | else | |
1993 | { | |
db1ff028 CC |
1994 | if (defined == PREDEFINED |
1995 | && (binding == elfcpp::STB_LOCAL | |
1996 | || this->version_script_.symbol_is_local(name))) | |
5417c94d | 1997 | this->force_local(oldsym); |
8c500701 ILT |
1998 | delete sym; |
1999 | return oldsym; | |
2000 | } | |
ead1e424 ILT |
2001 | } |
2002 | ||
2003 | // Define a symbol based on an Output_segment. | |
2004 | ||
14b31740 | 2005 | Symbol* |
2ea97941 | 2006 | Symbol_table::define_in_output_segment(const char* name, |
99fff23b ILT |
2007 | const char* version, |
2008 | Defined defined, | |
2009 | Output_segment* os, | |
2ea97941 ILT |
2010 | uint64_t value, |
2011 | uint64_t symsize, | |
9b07f471 ILT |
2012 | elfcpp::STT type, |
2013 | elfcpp::STB binding, | |
ead1e424 ILT |
2014 | elfcpp::STV visibility, |
2015 | unsigned char nonvis, | |
2ea97941 | 2016 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
2017 | bool only_if_ref) |
2018 | { | |
8851ecca | 2019 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
2020 | { |
2021 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 2022 | return this->do_define_in_output_segment<32>(name, version, defined, os, |
2ea97941 | 2023 | value, symsize, type, |
86f2e683 | 2024 | binding, visibility, nonvis, |
2ea97941 | 2025 | offset_base, only_if_ref); |
86f2e683 ILT |
2026 | #else |
2027 | gold_unreachable(); | |
2028 | #endif | |
2029 | } | |
8851ecca | 2030 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
2031 | { |
2032 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 2033 | return this->do_define_in_output_segment<64>(name, version, defined, os, |
2ea97941 | 2034 | value, symsize, type, |
86f2e683 | 2035 | binding, visibility, nonvis, |
2ea97941 | 2036 | offset_base, only_if_ref); |
86f2e683 ILT |
2037 | #else |
2038 | gold_unreachable(); | |
2039 | #endif | |
2040 | } | |
ead1e424 | 2041 | else |
a3ad94ed | 2042 | gold_unreachable(); |
ead1e424 ILT |
2043 | } |
2044 | ||
2045 | // Define a symbol in an Output_segment, sized version. | |
2046 | ||
2047 | template<int size> | |
14b31740 | 2048 | Sized_symbol<size>* |
ead1e424 | 2049 | Symbol_table::do_define_in_output_segment( |
2ea97941 ILT |
2050 | const char* name, |
2051 | const char* version, | |
99fff23b | 2052 | Defined defined, |
ead1e424 | 2053 | Output_segment* os, |
2ea97941 ILT |
2054 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2055 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
2056 | elfcpp::STT type, |
2057 | elfcpp::STB binding, | |
2058 | elfcpp::STV visibility, | |
2059 | unsigned char nonvis, | |
2ea97941 | 2060 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
2061 | bool only_if_ref) |
2062 | { | |
2063 | Sized_symbol<size>* sym; | |
86f2e683 | 2064 | Sized_symbol<size>* oldsym; |
8c500701 | 2065 | bool resolve_oldsym; |
ead1e424 | 2066 | |
8851ecca | 2067 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
2068 | { |
2069 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2070 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2071 | only_if_ref, &oldsym, |
2072 | &resolve_oldsym); | |
9025d29d ILT |
2073 | #else |
2074 | gold_unreachable(); | |
2075 | #endif | |
2076 | } | |
ead1e424 | 2077 | else |
9025d29d ILT |
2078 | { |
2079 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2080 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2081 | only_if_ref, &oldsym, |
2082 | &resolve_oldsym); | |
9025d29d ILT |
2083 | #else |
2084 | gold_unreachable(); | |
2085 | #endif | |
2086 | } | |
ead1e424 ILT |
2087 | |
2088 | if (sym == NULL) | |
14b31740 | 2089 | return NULL; |
ead1e424 | 2090 | |
2ea97941 | 2091 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
5146f448 CC |
2092 | visibility, nonvis, offset_base, |
2093 | defined == PREDEFINED); | |
14b31740 | 2094 | |
e5756efb | 2095 | if (oldsym == NULL) |
55a93433 ILT |
2096 | { |
2097 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 2098 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 2099 | this->force_local(sym); |
2ea97941 | 2100 | else if (version != NULL) |
75517b77 | 2101 | sym->set_is_default(); |
55a93433 ILT |
2102 | return sym; |
2103 | } | |
86f2e683 | 2104 | |
62855347 | 2105 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 2106 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2107 | |
2108 | if (resolve_oldsym) | |
2109 | return sym; | |
2110 | else | |
2111 | { | |
5417c94d CC |
2112 | if (binding == elfcpp::STB_LOCAL |
2113 | || this->version_script_.symbol_is_local(name)) | |
2114 | this->force_local(oldsym); | |
8c500701 ILT |
2115 | delete sym; |
2116 | return oldsym; | |
2117 | } | |
ead1e424 ILT |
2118 | } |
2119 | ||
2120 | // Define a special symbol with a constant value. It is a multiple | |
2121 | // definition error if this symbol is already defined. | |
2122 | ||
14b31740 | 2123 | Symbol* |
2ea97941 ILT |
2124 | Symbol_table::define_as_constant(const char* name, |
2125 | const char* version, | |
99fff23b | 2126 | Defined defined, |
2ea97941 ILT |
2127 | uint64_t value, |
2128 | uint64_t symsize, | |
9b07f471 ILT |
2129 | elfcpp::STT type, |
2130 | elfcpp::STB binding, | |
2131 | elfcpp::STV visibility, | |
2132 | unsigned char nonvis, | |
caa9d5d9 ILT |
2133 | bool only_if_ref, |
2134 | bool force_override) | |
ead1e424 | 2135 | { |
8851ecca | 2136 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
2137 | { |
2138 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 2139 | return this->do_define_as_constant<32>(name, version, defined, value, |
2ea97941 | 2140 | symsize, type, binding, |
caa9d5d9 ILT |
2141 | visibility, nonvis, only_if_ref, |
2142 | force_override); | |
86f2e683 ILT |
2143 | #else |
2144 | gold_unreachable(); | |
2145 | #endif | |
2146 | } | |
8851ecca | 2147 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
2148 | { |
2149 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 2150 | return this->do_define_as_constant<64>(name, version, defined, value, |
2ea97941 | 2151 | symsize, type, binding, |
caa9d5d9 ILT |
2152 | visibility, nonvis, only_if_ref, |
2153 | force_override); | |
86f2e683 ILT |
2154 | #else |
2155 | gold_unreachable(); | |
2156 | #endif | |
2157 | } | |
ead1e424 | 2158 | else |
a3ad94ed | 2159 | gold_unreachable(); |
ead1e424 ILT |
2160 | } |
2161 | ||
2162 | // Define a symbol as a constant, sized version. | |
2163 | ||
2164 | template<int size> | |
14b31740 | 2165 | Sized_symbol<size>* |
ead1e424 | 2166 | Symbol_table::do_define_as_constant( |
2ea97941 ILT |
2167 | const char* name, |
2168 | const char* version, | |
99fff23b | 2169 | Defined defined, |
2ea97941 ILT |
2170 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2171 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
2172 | elfcpp::STT type, |
2173 | elfcpp::STB binding, | |
2174 | elfcpp::STV visibility, | |
2175 | unsigned char nonvis, | |
caa9d5d9 ILT |
2176 | bool only_if_ref, |
2177 | bool force_override) | |
ead1e424 ILT |
2178 | { |
2179 | Sized_symbol<size>* sym; | |
86f2e683 | 2180 | Sized_symbol<size>* oldsym; |
8c500701 | 2181 | bool resolve_oldsym; |
ead1e424 | 2182 | |
8851ecca | 2183 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
2184 | { |
2185 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2186 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2187 | only_if_ref, &oldsym, |
2188 | &resolve_oldsym); | |
9025d29d ILT |
2189 | #else |
2190 | gold_unreachable(); | |
2191 | #endif | |
2192 | } | |
ead1e424 | 2193 | else |
9025d29d ILT |
2194 | { |
2195 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2196 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2197 | only_if_ref, &oldsym, |
2198 | &resolve_oldsym); | |
9025d29d ILT |
2199 | #else |
2200 | gold_unreachable(); | |
2201 | #endif | |
2202 | } | |
ead1e424 ILT |
2203 | |
2204 | if (sym == NULL) | |
14b31740 | 2205 | return NULL; |
ead1e424 | 2206 | |
2ea97941 | 2207 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
5146f448 | 2208 | nonvis, defined == PREDEFINED); |
14b31740 | 2209 | |
e5756efb | 2210 | if (oldsym == NULL) |
55a93433 | 2211 | { |
686c8caf ILT |
2212 | // Version symbols are absolute symbols with name == version. |
2213 | // We don't want to force them to be local. | |
2ea97941 ILT |
2214 | if ((version == NULL |
2215 | || name != version | |
2216 | || value != 0) | |
686c8caf | 2217 | && (binding == elfcpp::STB_LOCAL |
2ea97941 | 2218 | || this->version_script_.symbol_is_local(name))) |
55a93433 | 2219 | this->force_local(sym); |
2ea97941 ILT |
2220 | else if (version != NULL |
2221 | && (name != version || value != 0)) | |
75517b77 | 2222 | sym->set_is_default(); |
55a93433 ILT |
2223 | return sym; |
2224 | } | |
86f2e683 | 2225 | |
99fff23b | 2226 | if (force_override |
62855347 | 2227 | || Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 2228 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2229 | |
2230 | if (resolve_oldsym) | |
2231 | return sym; | |
2232 | else | |
2233 | { | |
5417c94d CC |
2234 | if (binding == elfcpp::STB_LOCAL |
2235 | || this->version_script_.symbol_is_local(name)) | |
2236 | this->force_local(oldsym); | |
8c500701 ILT |
2237 | delete sym; |
2238 | return oldsym; | |
2239 | } | |
ead1e424 ILT |
2240 | } |
2241 | ||
2242 | // Define a set of symbols in output sections. | |
2243 | ||
2244 | void | |
9b07f471 | 2245 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2246 | const Define_symbol_in_section* p, |
2247 | bool only_if_ref) | |
ead1e424 ILT |
2248 | { |
2249 | for (int i = 0; i < count; ++i, ++p) | |
2250 | { | |
2251 | Output_section* os = layout->find_output_section(p->output_section); | |
2252 | if (os != NULL) | |
99fff23b | 2253 | this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2254 | p->size, p->type, p->binding, |
2255 | p->visibility, p->nonvis, | |
a445fddf ILT |
2256 | p->offset_is_from_end, |
2257 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2258 | else |
99fff23b ILT |
2259 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2260 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2261 | only_if_ref || p->only_if_ref, |
2262 | false); | |
ead1e424 ILT |
2263 | } |
2264 | } | |
2265 | ||
2266 | // Define a set of symbols in output segments. | |
2267 | ||
2268 | void | |
9b07f471 | 2269 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2270 | const Define_symbol_in_segment* p, |
2271 | bool only_if_ref) | |
ead1e424 ILT |
2272 | { |
2273 | for (int i = 0; i < count; ++i, ++p) | |
2274 | { | |
2275 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
2276 | p->segment_flags_set, | |
2277 | p->segment_flags_clear); | |
2278 | if (os != NULL) | |
99fff23b | 2279 | this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2280 | p->size, p->type, p->binding, |
2281 | p->visibility, p->nonvis, | |
a445fddf ILT |
2282 | p->offset_base, |
2283 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2284 | else |
99fff23b ILT |
2285 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2286 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2287 | only_if_ref || p->only_if_ref, |
2288 | false); | |
ead1e424 ILT |
2289 | } |
2290 | } | |
2291 | ||
46fe1623 ILT |
2292 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
2293 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
2294 | // the offset within POSD. | |
2295 | ||
2296 | template<int size> | |
2297 | void | |
fe8718a4 | 2298 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
2299 | Sized_symbol<size>* csym, |
2300 | Output_data* posd, | |
2ea97941 | 2301 | typename elfcpp::Elf_types<size>::Elf_Addr value) |
46fe1623 ILT |
2302 | { |
2303 | gold_assert(csym->is_from_dynobj()); | |
2304 | gold_assert(!csym->is_copied_from_dynobj()); | |
2ea97941 ILT |
2305 | Object* object = csym->object(); |
2306 | gold_assert(object->is_dynamic()); | |
2307 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
46fe1623 ILT |
2308 | |
2309 | // Our copied variable has to override any variable in a shared | |
2310 | // library. | |
2311 | elfcpp::STB binding = csym->binding(); | |
2312 | if (binding == elfcpp::STB_WEAK) | |
2313 | binding = elfcpp::STB_GLOBAL; | |
2314 | ||
99fff23b | 2315 | this->define_in_output_data(csym->name(), csym->version(), COPY, |
2ea97941 | 2316 | posd, value, csym->symsize(), |
46fe1623 ILT |
2317 | csym->type(), binding, |
2318 | csym->visibility(), csym->nonvis(), | |
2319 | false, false); | |
2320 | ||
2321 | csym->set_is_copied_from_dynobj(); | |
2322 | csym->set_needs_dynsym_entry(); | |
2323 | ||
2324 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
2325 | ||
2326 | // We have now defined all aliases, but we have not entered them all | |
2327 | // in the copied_symbol_dynobjs_ map. | |
2328 | if (csym->has_alias()) | |
2329 | { | |
2330 | Symbol* sym = csym; | |
2331 | while (true) | |
2332 | { | |
2333 | sym = this->weak_aliases_[sym]; | |
2334 | if (sym == csym) | |
2335 | break; | |
2336 | gold_assert(sym->output_data() == posd); | |
2337 | ||
2338 | sym->set_is_copied_from_dynobj(); | |
2339 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
2340 | } | |
2341 | } | |
2342 | } | |
2343 | ||
2344 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
2345 | // the original definition was found. | |
2346 | ||
2347 | Dynobj* | |
2348 | Symbol_table::get_copy_source(const Symbol* sym) const | |
2349 | { | |
2350 | gold_assert(sym->is_copied_from_dynobj()); | |
2351 | Copied_symbol_dynobjs::const_iterator p = | |
2352 | this->copied_symbol_dynobjs_.find(sym); | |
2353 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
2354 | return p->second; | |
2355 | } | |
2356 | ||
f3e9c5c5 ILT |
2357 | // Add any undefined symbols named on the command line. |
2358 | ||
2359 | void | |
88a4108b | 2360 | Symbol_table::add_undefined_symbols_from_command_line(Layout* layout) |
f3e9c5c5 | 2361 | { |
88a4108b ILT |
2362 | if (parameters->options().any_undefined() |
2363 | || layout->script_options()->any_unreferenced()) | |
f3e9c5c5 ILT |
2364 | { |
2365 | if (parameters->target().get_size() == 32) | |
2366 | { | |
5adf9721 | 2367 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
88a4108b | 2368 | this->do_add_undefined_symbols_from_command_line<32>(layout); |
f3e9c5c5 ILT |
2369 | #else |
2370 | gold_unreachable(); | |
2371 | #endif | |
2372 | } | |
2373 | else if (parameters->target().get_size() == 64) | |
2374 | { | |
2375 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
88a4108b | 2376 | this->do_add_undefined_symbols_from_command_line<64>(layout); |
f3e9c5c5 ILT |
2377 | #else |
2378 | gold_unreachable(); | |
2379 | #endif | |
2380 | } | |
2381 | else | |
2382 | gold_unreachable(); | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | template<int size> | |
2387 | void | |
88a4108b | 2388 | Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout) |
f3e9c5c5 ILT |
2389 | { |
2390 | for (options::String_set::const_iterator p = | |
2391 | parameters->options().undefined_begin(); | |
2392 | p != parameters->options().undefined_end(); | |
2393 | ++p) | |
88a4108b | 2394 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); |
f3e9c5c5 | 2395 | |
31821be0 CC |
2396 | for (options::String_set::const_iterator p = |
2397 | parameters->options().export_dynamic_symbol_begin(); | |
2398 | p != parameters->options().export_dynamic_symbol_end(); | |
2399 | ++p) | |
2400 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); | |
2401 | ||
88a4108b ILT |
2402 | for (Script_options::referenced_const_iterator p = |
2403 | layout->script_options()->referenced_begin(); | |
2404 | p != layout->script_options()->referenced_end(); | |
2405 | ++p) | |
2406 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); | |
2407 | } | |
2408 | ||
2409 | template<int size> | |
2410 | void | |
2411 | Symbol_table::add_undefined_symbol_from_command_line(const char* name) | |
2412 | { | |
2413 | if (this->lookup(name) != NULL) | |
2414 | return; | |
f3e9c5c5 | 2415 | |
88a4108b | 2416 | const char* version = NULL; |
f3e9c5c5 | 2417 | |
88a4108b ILT |
2418 | Sized_symbol<size>* sym; |
2419 | Sized_symbol<size>* oldsym; | |
2420 | bool resolve_oldsym; | |
2421 | if (parameters->target().is_big_endian()) | |
2422 | { | |
f3e9c5c5 | 2423 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
88a4108b ILT |
2424 | sym = this->define_special_symbol<size, true>(&name, &version, |
2425 | false, &oldsym, | |
2426 | &resolve_oldsym); | |
f3e9c5c5 | 2427 | #else |
88a4108b | 2428 | gold_unreachable(); |
f3e9c5c5 | 2429 | #endif |
88a4108b ILT |
2430 | } |
2431 | else | |
2432 | { | |
f3e9c5c5 | 2433 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
88a4108b ILT |
2434 | sym = this->define_special_symbol<size, false>(&name, &version, |
2435 | false, &oldsym, | |
2436 | &resolve_oldsym); | |
f3e9c5c5 | 2437 | #else |
88a4108b | 2438 | gold_unreachable(); |
f3e9c5c5 | 2439 | #endif |
88a4108b | 2440 | } |
f3e9c5c5 | 2441 | |
88a4108b | 2442 | gold_assert(oldsym == NULL); |
f3e9c5c5 | 2443 | |
dc1c8a16 | 2444 | sym->init_undefined(name, version, 0, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
88a4108b ILT |
2445 | elfcpp::STV_DEFAULT, 0); |
2446 | ++this->saw_undefined_; | |
f3e9c5c5 ILT |
2447 | } |
2448 | ||
a3ad94ed ILT |
2449 | // Set the dynamic symbol indexes. INDEX is the index of the first |
2450 | // global dynamic symbol. Pointers to the symbols are stored into the | |
2451 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
2452 | // updated dynamic symbol index. | |
2453 | ||
2454 | unsigned int | |
9b07f471 | 2455 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 2456 | std::vector<Symbol*>* syms, |
14b31740 ILT |
2457 | Stringpool* dynpool, |
2458 | Versions* versions) | |
a3ad94ed | 2459 | { |
32e2b61d AM |
2460 | std::vector<Symbol*> as_needed_sym; |
2461 | ||
98ff9231 CC |
2462 | // Allow a target to set dynsym indexes. |
2463 | if (parameters->target().has_custom_set_dynsym_indexes()) | |
2464 | { | |
2465 | std::vector<Symbol*> dyn_symbols; | |
2466 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
2467 | p != this->table_.end(); | |
2468 | ++p) | |
2469 | { | |
2470 | Symbol* sym = p->second; | |
2471 | if (!sym->should_add_dynsym_entry(this)) | |
2472 | sym->set_dynsym_index(-1U); | |
2473 | else | |
2474 | dyn_symbols.push_back(sym); | |
2475 | } | |
2476 | ||
2477 | return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms, | |
2478 | dynpool, versions, this); | |
2479 | } | |
2480 | ||
a3ad94ed ILT |
2481 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2482 | p != this->table_.end(); | |
2483 | ++p) | |
2484 | { | |
2485 | Symbol* sym = p->second; | |
16649710 ILT |
2486 | |
2487 | // Note that SYM may already have a dynamic symbol index, since | |
2488 | // some symbols appear more than once in the symbol table, with | |
2489 | // and without a version. | |
2490 | ||
ce97fa81 | 2491 | if (!sym->should_add_dynsym_entry(this)) |
16649710 ILT |
2492 | sym->set_dynsym_index(-1U); |
2493 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
2494 | { |
2495 | sym->set_dynsym_index(index); | |
2496 | ++index; | |
2497 | syms->push_back(sym); | |
cfd73a4e | 2498 | dynpool->add(sym->name(), false, NULL); |
14b31740 | 2499 | |
594c8e5e | 2500 | // If the symbol is defined in a dynamic object and is |
32e2b61d AM |
2501 | // referenced strongly in a regular object, then mark the |
2502 | // dynamic object as needed. This is used to implement | |
2503 | // --as-needed. | |
2504 | if (sym->is_from_dynobj() | |
2505 | && sym->in_reg() | |
2506 | && !sym->is_undef_binding_weak()) | |
594c8e5e | 2507 | sym->object()->set_is_needed(); |
32e2b61d AM |
2508 | |
2509 | // Record any version information, except those from | |
2510 | // as-needed libraries not seen to be needed. Note that the | |
2511 | // is_needed state for such libraries can change in this loop. | |
2512 | if (sym->version() != NULL) | |
2513 | { | |
2514 | if (!sym->is_from_dynobj() | |
2515 | || !sym->object()->as_needed() | |
2516 | || sym->object()->is_needed()) | |
2517 | versions->record_version(this, dynpool, sym); | |
2518 | else | |
2519 | as_needed_sym.push_back(sym); | |
2520 | } | |
a3ad94ed ILT |
2521 | } |
2522 | } | |
2523 | ||
32e2b61d AM |
2524 | // Process version information for symbols from as-needed libraries. |
2525 | for (std::vector<Symbol*>::iterator p = as_needed_sym.begin(); | |
2526 | p != as_needed_sym.end(); | |
2527 | ++p) | |
2528 | { | |
2529 | Symbol* sym = *p; | |
2530 | ||
2531 | if (sym->object()->is_needed()) | |
2532 | versions->record_version(this, dynpool, sym); | |
2533 | else | |
2534 | sym->clear_version(); | |
2535 | } | |
2536 | ||
14b31740 ILT |
2537 | // Finish up the versions. In some cases this may add new dynamic |
2538 | // symbols. | |
9b07f471 | 2539 | index = versions->finalize(this, index, syms); |
14b31740 | 2540 | |
dc1c8a16 CC |
2541 | // Process target-specific symbols. |
2542 | for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin(); | |
2543 | p != this->target_symbols_.end(); | |
2544 | ++p) | |
2545 | { | |
2546 | (*p)->set_dynsym_index(index); | |
2547 | ++index; | |
2548 | syms->push_back(*p); | |
2549 | dynpool->add((*p)->name(), false, NULL); | |
2550 | } | |
2551 | ||
a3ad94ed ILT |
2552 | return index; |
2553 | } | |
2554 | ||
c06b7b0b | 2555 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
2556 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
2557 | // file offset OFF. Add their names to POOL. Return the new file | |
2558 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 2559 | |
75f65a3e | 2560 | off_t |
55a93433 ILT |
2561 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
2562 | size_t dyncount, Stringpool* pool, | |
ca09d69a | 2563 | unsigned int* plocal_symcount) |
54dc6425 | 2564 | { |
f6ce93d6 ILT |
2565 | off_t ret; |
2566 | ||
55a93433 ILT |
2567 | gold_assert(*plocal_symcount != 0); |
2568 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 2569 | |
16649710 ILT |
2570 | this->dynamic_offset_ = dynoff; |
2571 | this->first_dynamic_global_index_ = dyn_global_index; | |
2572 | this->dynamic_count_ = dyncount; | |
2573 | ||
8851ecca | 2574 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
2575 | { |
2576 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 2577 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
2578 | #else |
2579 | gold_unreachable(); | |
2580 | #endif | |
2581 | } | |
8851ecca | 2582 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
2583 | { |
2584 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 2585 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
2586 | #else |
2587 | gold_unreachable(); | |
2588 | #endif | |
2589 | } | |
61ba1cf9 | 2590 | else |
a3ad94ed | 2591 | gold_unreachable(); |
f6ce93d6 ILT |
2592 | |
2593 | // Now that we have the final symbol table, we can reliably note | |
2594 | // which symbols should get warnings. | |
cb295612 | 2595 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2596 | |
2597 | return ret; | |
75f65a3e ILT |
2598 | } |
2599 | ||
55a93433 ILT |
2600 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2601 | // POOL, update *PINDEX and *POFF. | |
2602 | ||
2603 | template<int size> | |
2604 | void | |
2605 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2606 | unsigned int* pindex, off_t* poff) | |
2607 | { | |
2608 | sym->set_symtab_index(*pindex); | |
6d1c4efb ILT |
2609 | if (sym->version() == NULL || !parameters->options().relocatable()) |
2610 | pool->add(sym->name(), false, NULL); | |
2611 | else | |
2612 | pool->add(sym->versioned_name(), true, NULL); | |
55a93433 ILT |
2613 | ++*pindex; |
2614 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2615 | } | |
2616 | ||
ead1e424 ILT |
2617 | // Set the final value for all the symbols. This is called after |
2618 | // Layout::finalize, so all the output sections have their final | |
2619 | // address. | |
75f65a3e ILT |
2620 | |
2621 | template<int size> | |
2622 | off_t | |
55a93433 ILT |
2623 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2624 | unsigned int* plocal_symcount) | |
75f65a3e | 2625 | { |
ead1e424 | 2626 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2627 | this->offset_ = off; |
2628 | ||
55a93433 ILT |
2629 | unsigned int index = *plocal_symcount; |
2630 | const unsigned int orig_index = index; | |
c06b7b0b | 2631 | |
55a93433 ILT |
2632 | // First do all the symbols which have been forced to be local, as |
2633 | // they must appear before all global symbols. | |
2634 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2635 | p != this->forced_locals_.end(); | |
2636 | ++p) | |
2637 | { | |
2638 | Symbol* sym = *p; | |
2639 | gold_assert(sym->is_forced_local()); | |
2640 | if (this->sized_finalize_symbol<size>(sym)) | |
2641 | { | |
2642 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2643 | ++*plocal_symcount; | |
2644 | } | |
2645 | } | |
2646 | ||
2647 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2648 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2649 | p != this->table_.end(); | |
2650 | ++p) | |
54dc6425 | 2651 | { |
55a93433 ILT |
2652 | Symbol* sym = p->second; |
2653 | if (this->sized_finalize_symbol<size>(sym)) | |
2654 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2655 | } | |
54dc6425 | 2656 | |
dc1c8a16 CC |
2657 | // Now do target-specific symbols. |
2658 | for (std::vector<Symbol*>::iterator p = this->target_symbols_.begin(); | |
2659 | p != this->target_symbols_.end(); | |
2660 | ++p) | |
2661 | { | |
2662 | this->add_to_final_symtab<size>(*p, pool, &index, &off); | |
2663 | } | |
2664 | ||
55a93433 | 2665 | this->output_count_ = index - orig_index; |
a3ad94ed | 2666 | |
55a93433 ILT |
2667 | return off; |
2668 | } | |
75f65a3e | 2669 | |
c0a62865 DK |
2670 | // Compute the final value of SYM and store status in location PSTATUS. |
2671 | // During relaxation, this may be called multiple times for a symbol to | |
2672 | // compute its would-be final value in each relaxation pass. | |
008db82e | 2673 | |
55a93433 | 2674 | template<int size> |
c0a62865 DK |
2675 | typename Sized_symbol<size>::Value_type |
2676 | Symbol_table::compute_final_value( | |
2677 | const Sized_symbol<size>* sym, | |
2678 | Compute_final_value_status* pstatus) const | |
55a93433 | 2679 | { |
ef9beddf | 2680 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2ea97941 | 2681 | Value_type value; |
ead1e424 | 2682 | |
55a93433 ILT |
2683 | switch (sym->source()) |
2684 | { | |
2685 | case Symbol::FROM_OBJECT: | |
2686 | { | |
d491d34e | 2687 | bool is_ordinary; |
2ea97941 | 2688 | unsigned int shndx = sym->shndx(&is_ordinary); |
ead1e424 | 2689 | |
d491d34e | 2690 | if (!is_ordinary |
2ea97941 ILT |
2691 | && shndx != elfcpp::SHN_ABS |
2692 | && !Symbol::is_common_shndx(shndx)) | |
55a93433 | 2693 | { |
c0a62865 DK |
2694 | *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION; |
2695 | return 0; | |
ead1e424 | 2696 | } |
ead1e424 | 2697 | |
55a93433 ILT |
2698 | Object* symobj = sym->object(); |
2699 | if (symobj->is_dynamic()) | |
ead1e424 | 2700 | { |
2ea97941 ILT |
2701 | value = 0; |
2702 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2703 | } |
89fc3421 CC |
2704 | else if (symobj->pluginobj() != NULL) |
2705 | { | |
2ea97941 ILT |
2706 | value = 0; |
2707 | shndx = elfcpp::SHN_UNDEF; | |
89fc3421 | 2708 | } |
2ea97941 ILT |
2709 | else if (shndx == elfcpp::SHN_UNDEF) |
2710 | value = 0; | |
d491d34e | 2711 | else if (!is_ordinary |
2ea97941 ILT |
2712 | && (shndx == elfcpp::SHN_ABS |
2713 | || Symbol::is_common_shndx(shndx))) | |
2714 | value = sym->value(); | |
55a93433 | 2715 | else |
ead1e424 | 2716 | { |
55a93433 | 2717 | Relobj* relobj = static_cast<Relobj*>(symobj); |
2ea97941 | 2718 | Output_section* os = relobj->output_section(shndx); |
55a93433 | 2719 | |
2ea97941 | 2720 | if (this->is_section_folded(relobj, shndx)) |
ef15dade ST |
2721 | { |
2722 | gold_assert(os == NULL); | |
2723 | // Get the os of the section it is folded onto. | |
2724 | Section_id folded = this->icf_->get_folded_section(relobj, | |
2ea97941 | 2725 | shndx); |
ef15dade ST |
2726 | gold_assert(folded.first != NULL); |
2727 | Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first); | |
d6344fb5 DK |
2728 | unsigned folded_shndx = folded.second; |
2729 | ||
2730 | os = folded_obj->output_section(folded_shndx); | |
ef15dade | 2731 | gold_assert(os != NULL); |
d6344fb5 DK |
2732 | |
2733 | // Replace (relobj, shndx) with canonical ICF input section. | |
2734 | shndx = folded_shndx; | |
2735 | relobj = folded_obj; | |
ef15dade ST |
2736 | } |
2737 | ||
d6344fb5 | 2738 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
ef15dade | 2739 | if (os == NULL) |
ead1e424 | 2740 | { |
6d03d481 ST |
2741 | bool static_or_reloc = (parameters->doing_static_link() || |
2742 | parameters->options().relocatable()); | |
2743 | gold_assert(static_or_reloc || sym->dynsym_index() == -1U); | |
2744 | ||
c0a62865 DK |
2745 | *pstatus = CFVS_NO_OUTPUT_SECTION; |
2746 | return 0; | |
ead1e424 | 2747 | } |
55a93433 | 2748 | |
eff45813 CC |
2749 | if (secoff64 == -1ULL) |
2750 | { | |
2751 | // The section needs special handling (e.g., a merge section). | |
ef15dade | 2752 | |
2ea97941 | 2753 | value = os->output_address(relobj, shndx, sym->value()); |
eff45813 CC |
2754 | } |
2755 | else | |
2756 | { | |
2757 | Value_type secoff = | |
2758 | convert_types<Value_type, uint64_t>(secoff64); | |
2759 | if (sym->type() == elfcpp::STT_TLS) | |
2ea97941 | 2760 | value = sym->value() + os->tls_offset() + secoff; |
eff45813 | 2761 | else |
2ea97941 | 2762 | value = sym->value() + os->address() + secoff; |
eff45813 | 2763 | } |
ead1e424 | 2764 | } |
55a93433 ILT |
2765 | } |
2766 | break; | |
2767 | ||
2768 | case Symbol::IN_OUTPUT_DATA: | |
2769 | { | |
2770 | Output_data* od = sym->output_data(); | |
2ea97941 | 2771 | value = sym->value(); |
155a0dd7 | 2772 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2773 | value += od->address(); |
155a0dd7 ILT |
2774 | else |
2775 | { | |
2776 | Output_section* os = od->output_section(); | |
2777 | gold_assert(os != NULL); | |
2ea97941 | 2778 | value += os->tls_offset() + (od->address() - os->address()); |
155a0dd7 | 2779 | } |
55a93433 | 2780 | if (sym->offset_is_from_end()) |
2ea97941 | 2781 | value += od->data_size(); |
55a93433 ILT |
2782 | } |
2783 | break; | |
2784 | ||
2785 | case Symbol::IN_OUTPUT_SEGMENT: | |
2786 | { | |
2787 | Output_segment* os = sym->output_segment(); | |
2ea97941 | 2788 | value = sym->value(); |
edfbb029 | 2789 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2790 | value += os->vaddr(); |
55a93433 ILT |
2791 | switch (sym->offset_base()) |
2792 | { | |
2793 | case Symbol::SEGMENT_START: | |
2794 | break; | |
2795 | case Symbol::SEGMENT_END: | |
2ea97941 | 2796 | value += os->memsz(); |
55a93433 ILT |
2797 | break; |
2798 | case Symbol::SEGMENT_BSS: | |
2ea97941 | 2799 | value += os->filesz(); |
55a93433 ILT |
2800 | break; |
2801 | default: | |
2802 | gold_unreachable(); | |
2803 | } | |
2804 | } | |
2805 | break; | |
ead1e424 | 2806 | |
f3e9c5c5 | 2807 | case Symbol::IS_CONSTANT: |
2ea97941 | 2808 | value = sym->value(); |
55a93433 | 2809 | break; |
ead1e424 | 2810 | |
f3e9c5c5 | 2811 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2812 | value = 0; |
f3e9c5c5 ILT |
2813 | break; |
2814 | ||
55a93433 ILT |
2815 | default: |
2816 | gold_unreachable(); | |
2817 | } | |
ead1e424 | 2818 | |
c0a62865 | 2819 | *pstatus = CFVS_OK; |
2ea97941 | 2820 | return value; |
c0a62865 DK |
2821 | } |
2822 | ||
2823 | // Finalize the symbol SYM. This returns true if the symbol should be | |
2824 | // added to the symbol table, false otherwise. | |
2825 | ||
2826 | template<int size> | |
2827 | bool | |
2828 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2829 | { | |
2830 | typedef typename Sized_symbol<size>::Value_type Value_type; | |
2831 | ||
2832 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
2833 | ||
2834 | // The default version of a symbol may appear twice in the symbol | |
2835 | // table. We only need to finalize it once. | |
2836 | if (sym->has_symtab_index()) | |
2837 | return false; | |
2838 | ||
2839 | if (!sym->in_reg()) | |
2840 | { | |
2841 | gold_assert(!sym->has_symtab_index()); | |
2842 | sym->set_symtab_index(-1U); | |
2843 | gold_assert(sym->dynsym_index() == -1U); | |
2844 | return false; | |
2845 | } | |
2846 | ||
badc8139 RÁE |
2847 | // If the symbol is only present on plugin files, the plugin decided we |
2848 | // don't need it. | |
2849 | if (!sym->in_real_elf()) | |
2850 | { | |
2851 | gold_assert(!sym->has_symtab_index()); | |
2852 | sym->set_symtab_index(-1U); | |
2853 | return false; | |
2854 | } | |
2855 | ||
c0a62865 DK |
2856 | // Compute final symbol value. |
2857 | Compute_final_value_status status; | |
2ea97941 | 2858 | Value_type value = this->compute_final_value(sym, &status); |
c0a62865 DK |
2859 | |
2860 | switch (status) | |
2861 | { | |
2862 | case CFVS_OK: | |
2863 | break; | |
2864 | case CFVS_UNSUPPORTED_SYMBOL_SECTION: | |
2865 | { | |
2866 | bool is_ordinary; | |
2ea97941 | 2867 | unsigned int shndx = sym->shndx(&is_ordinary); |
c0a62865 | 2868 | gold_error(_("%s: unsupported symbol section 0x%x"), |
2ea97941 | 2869 | sym->demangled_name().c_str(), shndx); |
c0a62865 DK |
2870 | } |
2871 | break; | |
2872 | case CFVS_NO_OUTPUT_SECTION: | |
2873 | sym->set_symtab_index(-1U); | |
2874 | return false; | |
2875 | default: | |
2876 | gold_unreachable(); | |
2877 | } | |
2878 | ||
2ea97941 | 2879 | sym->set_value(value); |
9e2dcb77 | 2880 | |
8c604651 CS |
2881 | if (parameters->options().strip_all() |
2882 | || !parameters->options().should_retain_symbol(sym->name())) | |
55a93433 ILT |
2883 | { |
2884 | sym->set_symtab_index(-1U); | |
2885 | return false; | |
54dc6425 | 2886 | } |
75f65a3e | 2887 | |
55a93433 | 2888 | return true; |
54dc6425 ILT |
2889 | } |
2890 | ||
61ba1cf9 ILT |
2891 | // Write out the global symbols. |
2892 | ||
2893 | void | |
fd9d194f | 2894 | Symbol_table::write_globals(const Stringpool* sympool, |
d491d34e ILT |
2895 | const Stringpool* dynpool, |
2896 | Output_symtab_xindex* symtab_xindex, | |
2897 | Output_symtab_xindex* dynsym_xindex, | |
2898 | Output_file* of) const | |
61ba1cf9 | 2899 | { |
8851ecca | 2900 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2901 | { |
9025d29d | 2902 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2903 | case Parameters::TARGET_32_LITTLE: |
fd9d194f | 2904 | this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2905 | dynsym_xindex, of); |
8851ecca | 2906 | break; |
9025d29d | 2907 | #endif |
8851ecca ILT |
2908 | #ifdef HAVE_TARGET_32_BIG |
2909 | case Parameters::TARGET_32_BIG: | |
fd9d194f | 2910 | this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2911 | dynsym_xindex, of); |
8851ecca | 2912 | break; |
9025d29d | 2913 | #endif |
9025d29d | 2914 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2915 | case Parameters::TARGET_64_LITTLE: |
fd9d194f | 2916 | this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2917 | dynsym_xindex, of); |
8851ecca | 2918 | break; |
9025d29d | 2919 | #endif |
8851ecca ILT |
2920 | #ifdef HAVE_TARGET_64_BIG |
2921 | case Parameters::TARGET_64_BIG: | |
fd9d194f | 2922 | this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2923 | dynsym_xindex, of); |
8851ecca ILT |
2924 | break; |
2925 | #endif | |
2926 | default: | |
2927 | gold_unreachable(); | |
61ba1cf9 | 2928 | } |
61ba1cf9 ILT |
2929 | } |
2930 | ||
2931 | // Write out the global symbols. | |
2932 | ||
2933 | template<int size, bool big_endian> | |
2934 | void | |
fd9d194f | 2935 | Symbol_table::sized_write_globals(const Stringpool* sympool, |
16649710 | 2936 | const Stringpool* dynpool, |
d491d34e ILT |
2937 | Output_symtab_xindex* symtab_xindex, |
2938 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2939 | Output_file* of) const |
2940 | { | |
8851ecca | 2941 | const Target& target = parameters->target(); |
9a2d6984 | 2942 | |
61ba1cf9 | 2943 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2944 | |
2945 | const unsigned int output_count = this->output_count_; | |
2946 | const section_size_type oview_size = output_count * sym_size; | |
2947 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2948 | unsigned char* psyms; |
2949 | if (this->offset_ == 0 || output_count == 0) | |
2950 | psyms = NULL; | |
2951 | else | |
2952 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2953 | |
55a93433 ILT |
2954 | const unsigned int dynamic_count = this->dynamic_count_; |
2955 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2956 | const unsigned int first_dynamic_global_index = | |
2957 | this->first_dynamic_global_index_; | |
16649710 | 2958 | unsigned char* dynamic_view; |
5fe2a0f5 | 2959 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2960 | dynamic_view = NULL; |
2961 | else | |
2962 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2963 | |
61ba1cf9 ILT |
2964 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2965 | p != this->table_.end(); | |
2966 | ++p) | |
2967 | { | |
2968 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2969 | ||
9a2d6984 | 2970 | // Possibly warn about unresolved symbols in shared libraries. |
fd9d194f | 2971 | this->warn_about_undefined_dynobj_symbol(sym); |
e2827e5f | 2972 | |
a3ad94ed | 2973 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2974 | unsigned int dynsym_index; |
2975 | if (dynamic_view == NULL) | |
2976 | dynsym_index = -1U; | |
2977 | else | |
2978 | dynsym_index = sym->dynsym_index(); | |
2979 | ||
2980 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2981 | { |
2982 | // This symbol is not included in the output file. | |
2983 | continue; | |
2984 | } | |
16649710 | 2985 | |
2ea97941 | 2986 | unsigned int shndx; |
88dd47ac ILT |
2987 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2988 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ce279a62 | 2989 | elfcpp::STB binding = sym->binding(); |
9634ed06 | 2990 | |
a100d66f ST |
2991 | // If --weak-unresolved-symbols is set, change binding of unresolved |
2992 | // global symbols to STB_WEAK. | |
2993 | if (parameters->options().weak_unresolved_symbols() | |
2994 | && binding == elfcpp::STB_GLOBAL | |
2995 | && sym->is_undefined()) | |
2996 | binding = elfcpp::STB_WEAK; | |
2997 | ||
9634ed06 CC |
2998 | // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL. |
2999 | if (binding == elfcpp::STB_GNU_UNIQUE | |
3000 | && !parameters->options().gnu_unique()) | |
3001 | binding = elfcpp::STB_GLOBAL; | |
3002 | ||
ead1e424 ILT |
3003 | switch (sym->source()) |
3004 | { | |
3005 | case Symbol::FROM_OBJECT: | |
3006 | { | |
d491d34e ILT |
3007 | bool is_ordinary; |
3008 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 3009 | |
d491d34e | 3010 | if (!is_ordinary |
0dfbdef4 | 3011 | && in_shndx != elfcpp::SHN_ABS |
8a5e3e08 | 3012 | && !Symbol::is_common_shndx(in_shndx)) |
ead1e424 | 3013 | { |
75f2446e | 3014 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 3015 | sym->demangled_name().c_str(), in_shndx); |
2ea97941 | 3016 | shndx = in_shndx; |
f6ce93d6 | 3017 | } |
ead1e424 ILT |
3018 | else |
3019 | { | |
75f2446e ILT |
3020 | Object* symobj = sym->object(); |
3021 | if (symobj->is_dynamic()) | |
3022 | { | |
3023 | if (sym->needs_dynsym_value()) | |
8851ecca | 3024 | dynsym_value = target.dynsym_value(sym); |
2ea97941 | 3025 | shndx = elfcpp::SHN_UNDEF; |
ce279a62 CC |
3026 | if (sym->is_undef_binding_weak()) |
3027 | binding = elfcpp::STB_WEAK; | |
74f67560 DK |
3028 | else |
3029 | binding = elfcpp::STB_GLOBAL; | |
75f2446e | 3030 | } |
89fc3421 | 3031 | else if (symobj->pluginobj() != NULL) |
2ea97941 | 3032 | shndx = elfcpp::SHN_UNDEF; |
75f2446e | 3033 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
3034 | || (!is_ordinary |
3035 | && (in_shndx == elfcpp::SHN_ABS | |
8a5e3e08 | 3036 | || Symbol::is_common_shndx(in_shndx)))) |
2ea97941 | 3037 | shndx = in_shndx; |
75f2446e ILT |
3038 | else |
3039 | { | |
3040 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 3041 | Output_section* os = relobj->output_section(in_shndx); |
ef15dade ST |
3042 | if (this->is_section_folded(relobj, in_shndx)) |
3043 | { | |
3044 | // This global symbol must be written out even though | |
3045 | // it is folded. | |
3046 | // Get the os of the section it is folded onto. | |
3047 | Section_id folded = | |
3048 | this->icf_->get_folded_section(relobj, in_shndx); | |
3049 | gold_assert(folded.first !=NULL); | |
3050 | Relobj* folded_obj = | |
3051 | reinterpret_cast<Relobj*>(folded.first); | |
3052 | os = folded_obj->output_section(folded.second); | |
3053 | gold_assert(os != NULL); | |
3054 | } | |
75f2446e | 3055 | gold_assert(os != NULL); |
2ea97941 | 3056 | shndx = os->out_shndx(); |
88dd47ac | 3057 | |
2ea97941 | 3058 | if (shndx >= elfcpp::SHN_LORESERVE) |
d491d34e ILT |
3059 | { |
3060 | if (sym_index != -1U) | |
2ea97941 | 3061 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 3062 | if (dynsym_index != -1U) |
2ea97941 ILT |
3063 | dynsym_xindex->add(dynsym_index, shndx); |
3064 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e ILT |
3065 | } |
3066 | ||
88dd47ac ILT |
3067 | // In object files symbol values are section |
3068 | // relative. | |
8851ecca | 3069 | if (parameters->options().relocatable()) |
88dd47ac | 3070 | sym_value -= os->address(); |
75f2446e | 3071 | } |
ead1e424 ILT |
3072 | } |
3073 | } | |
3074 | break; | |
3075 | ||
3076 | case Symbol::IN_OUTPUT_DATA: | |
502e8a84 CC |
3077 | { |
3078 | Output_data* od = sym->output_data(); | |
3079 | ||
3080 | shndx = od->out_shndx(); | |
3081 | if (shndx >= elfcpp::SHN_LORESERVE) | |
3082 | { | |
3083 | if (sym_index != -1U) | |
3084 | symtab_xindex->add(sym_index, shndx); | |
3085 | if (dynsym_index != -1U) | |
3086 | dynsym_xindex->add(dynsym_index, shndx); | |
3087 | shndx = elfcpp::SHN_XINDEX; | |
3088 | } | |
3089 | ||
3090 | // In object files symbol values are section | |
3091 | // relative. | |
3092 | if (parameters->options().relocatable()) | |
3093 | sym_value -= od->address(); | |
3094 | } | |
ead1e424 ILT |
3095 | break; |
3096 | ||
3097 | case Symbol::IN_OUTPUT_SEGMENT: | |
2ea97941 | 3098 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
3099 | break; |
3100 | ||
f3e9c5c5 | 3101 | case Symbol::IS_CONSTANT: |
2ea97941 | 3102 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
3103 | break; |
3104 | ||
f3e9c5c5 | 3105 | case Symbol::IS_UNDEFINED: |
2ea97941 | 3106 | shndx = elfcpp::SHN_UNDEF; |
f3e9c5c5 ILT |
3107 | break; |
3108 | ||
ead1e424 | 3109 | default: |
a3ad94ed | 3110 | gold_unreachable(); |
ead1e424 | 3111 | } |
61ba1cf9 | 3112 | |
16649710 ILT |
3113 | if (sym_index != -1U) |
3114 | { | |
55a93433 ILT |
3115 | sym_index -= first_global_index; |
3116 | gold_assert(sym_index < output_count); | |
3117 | unsigned char* ps = psyms + (sym_index * sym_size); | |
2ea97941 | 3118 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
ce279a62 | 3119 | binding, sympool, ps); |
16649710 | 3120 | } |
61ba1cf9 | 3121 | |
16649710 ILT |
3122 | if (dynsym_index != -1U) |
3123 | { | |
3124 | dynsym_index -= first_dynamic_global_index; | |
3125 | gold_assert(dynsym_index < dynamic_count); | |
3126 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
2ea97941 | 3127 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
ce279a62 | 3128 | binding, dynpool, pd); |
800d9823 CC |
3129 | // Allow a target to adjust dynamic symbol value. |
3130 | parameters->target().adjust_dyn_symbol(sym, pd); | |
16649710 | 3131 | } |
61ba1cf9 ILT |
3132 | } |
3133 | ||
dc1c8a16 CC |
3134 | // Write the target-specific symbols. |
3135 | for (std::vector<Symbol*>::const_iterator p = this->target_symbols_.begin(); | |
3136 | p != this->target_symbols_.end(); | |
3137 | ++p) | |
3138 | { | |
3139 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(*p); | |
3140 | ||
3141 | unsigned int sym_index = sym->symtab_index(); | |
3142 | unsigned int dynsym_index; | |
3143 | if (dynamic_view == NULL) | |
3144 | dynsym_index = -1U; | |
3145 | else | |
3146 | dynsym_index = sym->dynsym_index(); | |
3147 | ||
3148 | unsigned int shndx; | |
3149 | switch (sym->source()) | |
3150 | { | |
3151 | case Symbol::IS_CONSTANT: | |
3152 | shndx = elfcpp::SHN_ABS; | |
3153 | break; | |
3154 | case Symbol::IS_UNDEFINED: | |
3155 | shndx = elfcpp::SHN_UNDEF; | |
3156 | break; | |
3157 | default: | |
3158 | gold_unreachable(); | |
3159 | } | |
3160 | ||
3161 | if (sym_index != -1U) | |
3162 | { | |
3163 | sym_index -= first_global_index; | |
3164 | gold_assert(sym_index < output_count); | |
3165 | unsigned char* ps = psyms + (sym_index * sym_size); | |
3166 | this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx, | |
3167 | sym->binding(), sympool, | |
3168 | ps); | |
3169 | } | |
3170 | ||
3171 | if (dynsym_index != -1U) | |
3172 | { | |
3173 | dynsym_index -= first_dynamic_global_index; | |
3174 | gold_assert(dynsym_index < dynamic_count); | |
3175 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
3176 | this->sized_write_symbol<size, big_endian>(sym, sym->value(), shndx, | |
3177 | sym->binding(), dynpool, | |
3178 | pd); | |
3179 | } | |
3180 | } | |
3181 | ||
c06b7b0b | 3182 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
3183 | if (dynamic_view != NULL) |
3184 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
3185 | } | |
3186 | ||
3187 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
3188 | // strtab holding the name. | |
3189 | ||
3190 | template<int size, bool big_endian> | |
3191 | void | |
ab5c9e90 ILT |
3192 | Symbol_table::sized_write_symbol( |
3193 | Sized_symbol<size>* sym, | |
2ea97941 ILT |
3194 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
3195 | unsigned int shndx, | |
ce279a62 | 3196 | elfcpp::STB binding, |
ab5c9e90 | 3197 | const Stringpool* pool, |
7d1a9ebb | 3198 | unsigned char* p) const |
16649710 ILT |
3199 | { |
3200 | elfcpp::Sym_write<size, big_endian> osym(p); | |
6d1c4efb ILT |
3201 | if (sym->version() == NULL || !parameters->options().relocatable()) |
3202 | osym.put_st_name(pool->get_offset(sym->name())); | |
3203 | else | |
3204 | osym.put_st_name(pool->get_offset(sym->versioned_name())); | |
2ea97941 | 3205 | osym.put_st_value(value); |
58e54ac2 | 3206 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2ea97941 | 3207 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) |
58e54ac2 CD |
3208 | osym.put_st_size(0); |
3209 | else | |
3210 | osym.put_st_size(sym->symsize()); | |
53d7974c | 3211 | elfcpp::STT type = sym->type(); |
358de988 | 3212 | gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj()); |
55a93433 ILT |
3213 | // A version script may have overridden the default binding. |
3214 | if (sym->is_forced_local()) | |
53d7974c | 3215 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type)); |
55a93433 | 3216 | else |
ce279a62 | 3217 | osym.put_st_info(elfcpp::elf_st_info(binding, type)); |
16649710 | 3218 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2ea97941 | 3219 | osym.put_st_shndx(shndx); |
61ba1cf9 ILT |
3220 | } |
3221 | ||
9a2d6984 ILT |
3222 | // Check for unresolved symbols in shared libraries. This is |
3223 | // controlled by the --allow-shlib-undefined option. | |
3224 | ||
3225 | // We only warn about libraries for which we have seen all the | |
3226 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
3227 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
3228 | // entry, we aren't going to be able to reliably report whether the | |
3229 | // symbol is undefined. | |
3230 | ||
fd9d194f ILT |
3231 | // We also don't warn about libraries found in a system library |
3232 | // directory (e.g., /lib or /usr/lib); we assume that those libraries | |
3233 | // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl | |
3234 | // can have undefined references satisfied by ld-linux.so. | |
9a2d6984 ILT |
3235 | |
3236 | inline void | |
fd9d194f | 3237 | Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const |
9a2d6984 | 3238 | { |
d491d34e | 3239 | bool dummy; |
9a2d6984 ILT |
3240 | if (sym->source() == Symbol::FROM_OBJECT |
3241 | && sym->object()->is_dynamic() | |
d491d34e | 3242 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 3243 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
3244 | && !parameters->options().allow_shlib_undefined() |
3245 | && !parameters->target().is_defined_by_abi(sym) | |
fd9d194f | 3246 | && !sym->object()->is_in_system_directory()) |
9a2d6984 ILT |
3247 | { |
3248 | // A very ugly cast. | |
3249 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
3250 | if (!dynobj->has_unknown_needed_entries()) | |
f073bbf7 | 3251 | gold_undefined_symbol(sym); |
9a2d6984 ILT |
3252 | } |
3253 | } | |
3254 | ||
a3ad94ed ILT |
3255 | // Write out a section symbol. Return the update offset. |
3256 | ||
3257 | void | |
ca09d69a | 3258 | Symbol_table::write_section_symbol(const Output_section* os, |
d491d34e | 3259 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
3260 | Output_file* of, |
3261 | off_t offset) const | |
3262 | { | |
8851ecca | 3263 | switch (parameters->size_and_endianness()) |
a3ad94ed | 3264 | { |
9025d29d | 3265 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 3266 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
3267 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
3268 | offset); | |
8851ecca | 3269 | break; |
9025d29d | 3270 | #endif |
8851ecca ILT |
3271 | #ifdef HAVE_TARGET_32_BIG |
3272 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
3273 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
3274 | offset); | |
8851ecca | 3275 | break; |
9025d29d | 3276 | #endif |
9025d29d | 3277 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 3278 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
3279 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
3280 | offset); | |
8851ecca | 3281 | break; |
9025d29d | 3282 | #endif |
8851ecca ILT |
3283 | #ifdef HAVE_TARGET_64_BIG |
3284 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
3285 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
3286 | offset); | |
8851ecca ILT |
3287 | break; |
3288 | #endif | |
3289 | default: | |
3290 | gold_unreachable(); | |
a3ad94ed | 3291 | } |
a3ad94ed ILT |
3292 | } |
3293 | ||
3294 | // Write out a section symbol, specialized for size and endianness. | |
3295 | ||
3296 | template<int size, bool big_endian> | |
3297 | void | |
3298 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 3299 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
3300 | Output_file* of, |
3301 | off_t offset) const | |
3302 | { | |
3303 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
3304 | ||
3305 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
3306 | ||
3307 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
3308 | osym.put_st_name(0); | |
b4ecf66b ILT |
3309 | if (parameters->options().relocatable()) |
3310 | osym.put_st_value(0); | |
3311 | else | |
3312 | osym.put_st_value(os->address()); | |
a3ad94ed ILT |
3313 | osym.put_st_size(0); |
3314 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
3315 | elfcpp::STT_SECTION)); | |
3316 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e | 3317 | |
2ea97941 ILT |
3318 | unsigned int shndx = os->out_shndx(); |
3319 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e | 3320 | { |
2ea97941 ILT |
3321 | symtab_xindex->add(os->symtab_index(), shndx); |
3322 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 3323 | } |
2ea97941 | 3324 | osym.put_st_shndx(shndx); |
a3ad94ed ILT |
3325 | |
3326 | of->write_output_view(offset, sym_size, pov); | |
3327 | } | |
3328 | ||
abaa3995 ILT |
3329 | // Print statistical information to stderr. This is used for --stats. |
3330 | ||
3331 | void | |
3332 | Symbol_table::print_stats() const | |
3333 | { | |
3334 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
3335 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
3336 | program_name, this->table_.size(), this->table_.bucket_count()); | |
3337 | #else | |
3338 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
3339 | program_name, this->table_.size()); | |
3340 | #endif | |
ad8f37d1 | 3341 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
3342 | } |
3343 | ||
ff541f30 ILT |
3344 | // We check for ODR violations by looking for symbols with the same |
3345 | // name for which the debugging information reports that they were | |
71ff8986 | 3346 | // defined in disjoint source locations. When comparing the source |
55382fb7 ILT |
3347 | // location, we consider instances with the same base filename to be |
3348 | // the same. This is because different object files/shared libraries | |
3349 | // can include the same header file using different paths, and | |
3350 | // different optimization settings can make the line number appear to | |
3351 | // be a couple lines off, and we don't want to report an ODR violation | |
3352 | // in those cases. | |
ff541f30 ILT |
3353 | |
3354 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 3355 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
71ff8986 | 3356 | // operator used with std::sort. |
ff541f30 ILT |
3357 | |
3358 | struct Odr_violation_compare | |
3359 | { | |
3360 | bool | |
3361 | operator()(const std::string& s1, const std::string& s2) const | |
3362 | { | |
55382fb7 | 3363 | // Inputs should be of the form "dirname/filename:linenum" where |
71ff8986 | 3364 | // "dirname/" is optional. We want to compare just the filename:linenum. |
55382fb7 | 3365 | |
71ff8986 | 3366 | // Find the last '/' in each string. |
55382fb7 ILT |
3367 | std::string::size_type s1begin = s1.rfind('/'); |
3368 | std::string::size_type s2begin = s2.rfind('/'); | |
55382fb7 ILT |
3369 | // If there was no '/' in a string, start at the beginning. |
3370 | if (s1begin == std::string::npos) | |
3371 | s1begin = 0; | |
3372 | if (s2begin == std::string::npos) | |
3373 | s2begin = 0; | |
71ff8986 ILT |
3374 | return s1.compare(s1begin, std::string::npos, |
3375 | s2, s2begin, std::string::npos) < 0; | |
ff541f30 ILT |
3376 | } |
3377 | }; | |
3378 | ||
71ff8986 ILT |
3379 | // Returns all of the lines attached to LOC, not just the one the |
3380 | // instruction actually came from. | |
3381 | std::vector<std::string> | |
3382 | Symbol_table::linenos_from_loc(const Task* task, | |
3383 | const Symbol_location& loc) | |
3384 | { | |
3385 | // We need to lock the object in order to read it. This | |
3386 | // means that we have to run in a singleton Task. If we | |
3387 | // want to run this in a general Task for better | |
3388 | // performance, we will need one Task for object, plus | |
3389 | // appropriate locking to ensure that we don't conflict with | |
3390 | // other uses of the object. Also note, one_addr2line is not | |
3391 | // currently thread-safe. | |
3392 | Task_lock_obj<Object> tl(task, loc.object); | |
3393 | ||
3394 | std::vector<std::string> result; | |
dc3714f3 AM |
3395 | Symbol_location code_loc = loc; |
3396 | parameters->target().function_location(&code_loc); | |
71ff8986 ILT |
3397 | // 16 is the size of the object-cache that one_addr2line should use. |
3398 | std::string canonical_result = Dwarf_line_info::one_addr2line( | |
dc3714f3 | 3399 | code_loc.object, code_loc.shndx, code_loc.offset, 16, &result); |
71ff8986 ILT |
3400 | if (!canonical_result.empty()) |
3401 | result.push_back(canonical_result); | |
3402 | return result; | |
3403 | } | |
3404 | ||
3405 | // OutputIterator that records if it was ever assigned to. This | |
3406 | // allows it to be used with std::set_intersection() to check for | |
3407 | // intersection rather than computing the intersection. | |
3408 | struct Check_intersection | |
3409 | { | |
3410 | Check_intersection() | |
3411 | : value_(false) | |
3412 | {} | |
3413 | ||
3414 | bool had_intersection() const | |
3415 | { return this->value_; } | |
3416 | ||
3417 | Check_intersection& operator++() | |
3418 | { return *this; } | |
3419 | ||
3420 | Check_intersection& operator*() | |
3421 | { return *this; } | |
3422 | ||
3423 | template<typename T> | |
3424 | Check_intersection& operator=(const T&) | |
3425 | { | |
3426 | this->value_ = true; | |
3427 | return *this; | |
3428 | } | |
3429 | ||
3430 | private: | |
3431 | bool value_; | |
3432 | }; | |
3433 | ||
70e654ba | 3434 | // Check candidate_odr_violations_ to find symbols with the same name |
71ff8986 ILT |
3435 | // but apparently different definitions (different source-file/line-no |
3436 | // for each line assigned to the first instruction). | |
70e654ba ILT |
3437 | |
3438 | void | |
17a1d0a9 ILT |
3439 | Symbol_table::detect_odr_violations(const Task* task, |
3440 | const char* output_file_name) const | |
70e654ba ILT |
3441 | { |
3442 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
3443 | it != candidate_odr_violations_.end(); | |
3444 | ++it) | |
3445 | { | |
71ff8986 ILT |
3446 | const char* const symbol_name = it->first; |
3447 | ||
3448 | std::string first_object_name; | |
3449 | std::vector<std::string> first_object_linenos; | |
3450 | ||
3451 | Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator | |
3452 | locs = it->second.begin(); | |
3453 | const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator | |
3454 | locs_end = it->second.end(); | |
3455 | for (; locs != locs_end && first_object_linenos.empty(); ++locs) | |
70e654ba | 3456 | { |
71ff8986 ILT |
3457 | // Save the line numbers from the first definition to |
3458 | // compare to the other definitions. Ideally, we'd compare | |
3459 | // every definition to every other, but we don't want to | |
3460 | // take O(N^2) time to do this. This shortcut may cause | |
3461 | // false negatives that appear or disappear depending on the | |
3462 | // link order, but it won't cause false positives. | |
3463 | first_object_name = locs->object->name(); | |
3464 | first_object_linenos = this->linenos_from_loc(task, *locs); | |
70e654ba | 3465 | } |
437ddf0c CC |
3466 | if (first_object_linenos.empty()) |
3467 | continue; | |
70e654ba | 3468 | |
71ff8986 | 3469 | // Sort by Odr_violation_compare to make std::set_intersection work. |
437ddf0c | 3470 | std::string first_object_canonical_result = first_object_linenos.back(); |
71ff8986 ILT |
3471 | std::sort(first_object_linenos.begin(), first_object_linenos.end(), |
3472 | Odr_violation_compare()); | |
3473 | ||
3474 | for (; locs != locs_end; ++locs) | |
70e654ba | 3475 | { |
71ff8986 ILT |
3476 | std::vector<std::string> linenos = |
3477 | this->linenos_from_loc(task, *locs); | |
3478 | // linenos will be empty if we couldn't parse the debug info. | |
3479 | if (linenos.empty()) | |
3480 | continue; | |
3481 | // Sort by Odr_violation_compare to make std::set_intersection work. | |
437ddf0c CC |
3482 | gold_assert(!linenos.empty()); |
3483 | std::string second_object_canonical_result = linenos.back(); | |
71ff8986 ILT |
3484 | std::sort(linenos.begin(), linenos.end(), Odr_violation_compare()); |
3485 | ||
3486 | Check_intersection intersection_result = | |
3487 | std::set_intersection(first_object_linenos.begin(), | |
3488 | first_object_linenos.end(), | |
3489 | linenos.begin(), | |
3490 | linenos.end(), | |
3491 | Check_intersection(), | |
3492 | Odr_violation_compare()); | |
3493 | if (!intersection_result.had_intersection()) | |
3494 | { | |
3495 | gold_warning(_("while linking %s: symbol '%s' defined in " | |
3496 | "multiple places (possible ODR violation):"), | |
3497 | output_file_name, demangle(symbol_name).c_str()); | |
3498 | // This only prints one location from each definition, | |
3499 | // which may not be the location we expect to intersect | |
3500 | // with another definition. We could print the whole | |
3501 | // set of locations, but that seems too verbose. | |
71ff8986 | 3502 | fprintf(stderr, _(" %s from %s\n"), |
437ddf0c | 3503 | first_object_canonical_result.c_str(), |
71ff8986 ILT |
3504 | first_object_name.c_str()); |
3505 | fprintf(stderr, _(" %s from %s\n"), | |
437ddf0c | 3506 | second_object_canonical_result.c_str(), |
71ff8986 ILT |
3507 | locs->object->name().c_str()); |
3508 | // Only print one broken pair, to avoid needing to | |
3509 | // compare against a list of the disjoint definition | |
3510 | // locations we've found so far. (If we kept comparing | |
3511 | // against just the first one, we'd get a lot of | |
3512 | // redundant complaints about the second definition | |
3513 | // location.) | |
3514 | break; | |
3515 | } | |
70e654ba ILT |
3516 | } |
3517 | } | |
e4e5049b CS |
3518 | // We only call one_addr2line() in this function, so we can clear its cache. |
3519 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
3520 | } |
3521 | ||
f6ce93d6 ILT |
3522 | // Warnings functions. |
3523 | ||
3524 | // Add a new warning. | |
3525 | ||
3526 | void | |
2ea97941 | 3527 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, |
cb295612 | 3528 | const std::string& warning) |
f6ce93d6 | 3529 | { |
2ea97941 ILT |
3530 | name = symtab->canonicalize_name(name); |
3531 | this->warnings_[name].set(obj, warning); | |
f6ce93d6 ILT |
3532 | } |
3533 | ||
3534 | // Look through the warnings and mark the symbols for which we should | |
3535 | // warn. This is called during Layout::finalize when we know the | |
3536 | // sources for all the symbols. | |
3537 | ||
3538 | void | |
cb295612 | 3539 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
3540 | { |
3541 | for (Warning_table::iterator p = this->warnings_.begin(); | |
3542 | p != this->warnings_.end(); | |
3543 | ++p) | |
3544 | { | |
3545 | Symbol* sym = symtab->lookup(p->first, NULL); | |
3546 | if (sym != NULL | |
3547 | && sym->source() == Symbol::FROM_OBJECT | |
3548 | && sym->object() == p->second.object) | |
cb295612 | 3549 | sym->set_has_warning(); |
f6ce93d6 ILT |
3550 | } |
3551 | } | |
3552 | ||
3553 | // Issue a warning. This is called when we see a relocation against a | |
3554 | // symbol for which has a warning. | |
3555 | ||
75f2446e | 3556 | template<int size, bool big_endian> |
f6ce93d6 | 3557 | void |
75f2446e ILT |
3558 | Warnings::issue_warning(const Symbol* sym, |
3559 | const Relocate_info<size, big_endian>* relinfo, | |
3560 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 3561 | { |
a3ad94ed | 3562 | gold_assert(sym->has_warning()); |
9d3b0698 ILT |
3563 | |
3564 | // We don't want to issue a warning for a relocation against the | |
3565 | // symbol in the same object file in which the symbol is defined. | |
3566 | if (sym->object() == relinfo->object) | |
3567 | return; | |
3568 | ||
f6ce93d6 | 3569 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 3570 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
3571 | gold_warning_at_location(relinfo, relnum, reloffset, |
3572 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
3573 | } |
3574 | ||
14bfc3f5 ILT |
3575 | // Instantiate the templates we need. We could use the configure |
3576 | // script to restrict this to only the ones needed for implemented | |
3577 | // targets. | |
3578 | ||
c7912668 ILT |
3579 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3580 | template | |
3581 | void | |
3582 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
3583 | #endif | |
3584 | ||
3585 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3586 | template | |
3587 | void | |
3588 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
3589 | #endif | |
3590 | ||
193a53d9 | 3591 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
3592 | template |
3593 | void | |
193a53d9 | 3594 | Symbol_table::add_from_relobj<32, false>( |
6fa2a40b | 3595 | Sized_relobj_file<32, false>* relobj, |
f6ce93d6 | 3596 | const unsigned char* syms, |
14bfc3f5 | 3597 | size_t count, |
d491d34e | 3598 | size_t symndx_offset, |
14bfc3f5 ILT |
3599 | const char* sym_names, |
3600 | size_t sym_name_size, | |
6fa2a40b | 3601 | Sized_relobj_file<32, false>::Symbols* sympointers, |
92de84a6 | 3602 | size_t* defined); |
193a53d9 | 3603 | #endif |
14bfc3f5 | 3604 | |
193a53d9 | 3605 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
3606 | template |
3607 | void | |
193a53d9 | 3608 | Symbol_table::add_from_relobj<32, true>( |
6fa2a40b | 3609 | Sized_relobj_file<32, true>* relobj, |
f6ce93d6 | 3610 | const unsigned char* syms, |
14bfc3f5 | 3611 | size_t count, |
d491d34e | 3612 | size_t symndx_offset, |
14bfc3f5 ILT |
3613 | const char* sym_names, |
3614 | size_t sym_name_size, | |
6fa2a40b | 3615 | Sized_relobj_file<32, true>::Symbols* sympointers, |
92de84a6 | 3616 | size_t* defined); |
193a53d9 | 3617 | #endif |
14bfc3f5 | 3618 | |
193a53d9 | 3619 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
3620 | template |
3621 | void | |
193a53d9 | 3622 | Symbol_table::add_from_relobj<64, false>( |
6fa2a40b | 3623 | Sized_relobj_file<64, false>* relobj, |
f6ce93d6 | 3624 | const unsigned char* syms, |
14bfc3f5 | 3625 | size_t count, |
d491d34e | 3626 | size_t symndx_offset, |
14bfc3f5 ILT |
3627 | const char* sym_names, |
3628 | size_t sym_name_size, | |
6fa2a40b | 3629 | Sized_relobj_file<64, false>::Symbols* sympointers, |
92de84a6 | 3630 | size_t* defined); |
193a53d9 | 3631 | #endif |
14bfc3f5 | 3632 | |
193a53d9 | 3633 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
3634 | template |
3635 | void | |
193a53d9 | 3636 | Symbol_table::add_from_relobj<64, true>( |
6fa2a40b | 3637 | Sized_relobj_file<64, true>* relobj, |
f6ce93d6 | 3638 | const unsigned char* syms, |
14bfc3f5 | 3639 | size_t count, |
d491d34e | 3640 | size_t symndx_offset, |
14bfc3f5 ILT |
3641 | const char* sym_names, |
3642 | size_t sym_name_size, | |
6fa2a40b | 3643 | Sized_relobj_file<64, true>::Symbols* sympointers, |
92de84a6 | 3644 | size_t* defined); |
193a53d9 | 3645 | #endif |
14bfc3f5 | 3646 | |
89fc3421 CC |
3647 | #ifdef HAVE_TARGET_32_LITTLE |
3648 | template | |
3649 | Symbol* | |
3650 | Symbol_table::add_from_pluginobj<32, false>( | |
3651 | Sized_pluginobj<32, false>* obj, | |
3652 | const char* name, | |
3653 | const char* ver, | |
3654 | elfcpp::Sym<32, false>* sym); | |
3655 | #endif | |
3656 | ||
3657 | #ifdef HAVE_TARGET_32_BIG | |
3658 | template | |
3659 | Symbol* | |
3660 | Symbol_table::add_from_pluginobj<32, true>( | |
3661 | Sized_pluginobj<32, true>* obj, | |
3662 | const char* name, | |
3663 | const char* ver, | |
3664 | elfcpp::Sym<32, true>* sym); | |
3665 | #endif | |
3666 | ||
3667 | #ifdef HAVE_TARGET_64_LITTLE | |
3668 | template | |
3669 | Symbol* | |
3670 | Symbol_table::add_from_pluginobj<64, false>( | |
3671 | Sized_pluginobj<64, false>* obj, | |
3672 | const char* name, | |
3673 | const char* ver, | |
3674 | elfcpp::Sym<64, false>* sym); | |
3675 | #endif | |
3676 | ||
3677 | #ifdef HAVE_TARGET_64_BIG | |
3678 | template | |
3679 | Symbol* | |
3680 | Symbol_table::add_from_pluginobj<64, true>( | |
3681 | Sized_pluginobj<64, true>* obj, | |
3682 | const char* name, | |
3683 | const char* ver, | |
3684 | elfcpp::Sym<64, true>* sym); | |
3685 | #endif | |
3686 | ||
193a53d9 | 3687 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
3688 | template |
3689 | void | |
193a53d9 ILT |
3690 | Symbol_table::add_from_dynobj<32, false>( |
3691 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
3692 | const unsigned char* syms, |
3693 | size_t count, | |
3694 | const char* sym_names, | |
3695 | size_t sym_name_size, | |
3696 | const unsigned char* versym, | |
3697 | size_t versym_size, | |
92de84a6 | 3698 | const std::vector<const char*>* version_map, |
6fa2a40b | 3699 | Sized_relobj_file<32, false>::Symbols* sympointers, |
92de84a6 | 3700 | size_t* defined); |
193a53d9 | 3701 | #endif |
dbe717ef | 3702 | |
193a53d9 | 3703 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
3704 | template |
3705 | void | |
193a53d9 ILT |
3706 | Symbol_table::add_from_dynobj<32, true>( |
3707 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
3708 | const unsigned char* syms, |
3709 | size_t count, | |
3710 | const char* sym_names, | |
3711 | size_t sym_name_size, | |
3712 | const unsigned char* versym, | |
3713 | size_t versym_size, | |
92de84a6 | 3714 | const std::vector<const char*>* version_map, |
6fa2a40b | 3715 | Sized_relobj_file<32, true>::Symbols* sympointers, |
92de84a6 | 3716 | size_t* defined); |
193a53d9 | 3717 | #endif |
dbe717ef | 3718 | |
193a53d9 | 3719 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
3720 | template |
3721 | void | |
193a53d9 ILT |
3722 | Symbol_table::add_from_dynobj<64, false>( |
3723 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
3724 | const unsigned char* syms, |
3725 | size_t count, | |
3726 | const char* sym_names, | |
3727 | size_t sym_name_size, | |
3728 | const unsigned char* versym, | |
3729 | size_t versym_size, | |
92de84a6 | 3730 | const std::vector<const char*>* version_map, |
6fa2a40b | 3731 | Sized_relobj_file<64, false>::Symbols* sympointers, |
92de84a6 | 3732 | size_t* defined); |
193a53d9 | 3733 | #endif |
dbe717ef | 3734 | |
193a53d9 | 3735 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
3736 | template |
3737 | void | |
193a53d9 ILT |
3738 | Symbol_table::add_from_dynobj<64, true>( |
3739 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
3740 | const unsigned char* syms, |
3741 | size_t count, | |
3742 | const char* sym_names, | |
3743 | size_t sym_name_size, | |
3744 | const unsigned char* versym, | |
3745 | size_t versym_size, | |
92de84a6 | 3746 | const std::vector<const char*>* version_map, |
6fa2a40b | 3747 | Sized_relobj_file<64, true>::Symbols* sympointers, |
92de84a6 | 3748 | size_t* defined); |
193a53d9 | 3749 | #endif |
dbe717ef | 3750 | |
cdc29364 CC |
3751 | #ifdef HAVE_TARGET_32_LITTLE |
3752 | template | |
26d3c67d | 3753 | Sized_symbol<32>* |
cdc29364 CC |
3754 | Symbol_table::add_from_incrobj( |
3755 | Object* obj, | |
3756 | const char* name, | |
3757 | const char* ver, | |
3758 | elfcpp::Sym<32, false>* sym); | |
3759 | #endif | |
3760 | ||
3761 | #ifdef HAVE_TARGET_32_BIG | |
3762 | template | |
26d3c67d | 3763 | Sized_symbol<32>* |
cdc29364 CC |
3764 | Symbol_table::add_from_incrobj( |
3765 | Object* obj, | |
3766 | const char* name, | |
3767 | const char* ver, | |
3768 | elfcpp::Sym<32, true>* sym); | |
3769 | #endif | |
3770 | ||
3771 | #ifdef HAVE_TARGET_64_LITTLE | |
3772 | template | |
26d3c67d | 3773 | Sized_symbol<64>* |
cdc29364 CC |
3774 | Symbol_table::add_from_incrobj( |
3775 | Object* obj, | |
3776 | const char* name, | |
3777 | const char* ver, | |
3778 | elfcpp::Sym<64, false>* sym); | |
3779 | #endif | |
3780 | ||
3781 | #ifdef HAVE_TARGET_64_BIG | |
3782 | template | |
26d3c67d | 3783 | Sized_symbol<64>* |
cdc29364 CC |
3784 | Symbol_table::add_from_incrobj( |
3785 | Object* obj, | |
3786 | const char* name, | |
3787 | const char* ver, | |
3788 | elfcpp::Sym<64, true>* sym); | |
3789 | #endif | |
3790 | ||
46fe1623 ILT |
3791 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3792 | template | |
3793 | void | |
fe8718a4 | 3794 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
3795 | Sized_symbol<32>* sym, |
3796 | Output_data* posd, | |
2ea97941 | 3797 | elfcpp::Elf_types<32>::Elf_Addr value); |
46fe1623 ILT |
3798 | #endif |
3799 | ||
3800 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3801 | template | |
3802 | void | |
fe8718a4 | 3803 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
3804 | Sized_symbol<64>* sym, |
3805 | Output_data* posd, | |
2ea97941 | 3806 | elfcpp::Elf_types<64>::Elf_Addr value); |
46fe1623 ILT |
3807 | #endif |
3808 | ||
beacaa96 CC |
3809 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3810 | template | |
3811 | void | |
3812 | Sized_symbol<32>::init_output_data(const char* name, const char* version, | |
3813 | Output_data* od, Value_type value, | |
3814 | Size_type symsize, elfcpp::STT type, | |
3815 | elfcpp::STB binding, | |
3816 | elfcpp::STV visibility, | |
3817 | unsigned char nonvis, | |
3818 | bool offset_is_from_end, | |
3819 | bool is_predefined); | |
3820 | #endif | |
3821 | ||
3822 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3823 | template | |
3824 | void | |
3825 | Sized_symbol<64>::init_output_data(const char* name, const char* version, | |
3826 | Output_data* od, Value_type value, | |
3827 | Size_type symsize, elfcpp::STT type, | |
3828 | elfcpp::STB binding, | |
3829 | elfcpp::STV visibility, | |
3830 | unsigned char nonvis, | |
3831 | bool offset_is_from_end, | |
3832 | bool is_predefined); | |
3833 | #endif | |
3834 | ||
75f2446e ILT |
3835 | #ifdef HAVE_TARGET_32_LITTLE |
3836 | template | |
3837 | void | |
3838 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
3839 | const Relocate_info<32, false>* relinfo, | |
3840 | size_t relnum, off_t reloffset) const; | |
3841 | #endif | |
3842 | ||
3843 | #ifdef HAVE_TARGET_32_BIG | |
3844 | template | |
3845 | void | |
3846 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
3847 | const Relocate_info<32, true>* relinfo, | |
3848 | size_t relnum, off_t reloffset) const; | |
3849 | #endif | |
3850 | ||
3851 | #ifdef HAVE_TARGET_64_LITTLE | |
3852 | template | |
3853 | void | |
3854 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
3855 | const Relocate_info<64, false>* relinfo, | |
3856 | size_t relnum, off_t reloffset) const; | |
3857 | #endif | |
3858 | ||
3859 | #ifdef HAVE_TARGET_64_BIG | |
3860 | template | |
3861 | void | |
3862 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
3863 | const Relocate_info<64, true>* relinfo, | |
3864 | size_t relnum, off_t reloffset) const; | |
3865 | #endif | |
3866 | ||
14bfc3f5 | 3867 | } // End namespace gold. |