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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
b90efa5b | 3 | // Copyright (C) 2006-2015 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 ILT |
287 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
288 | elfcpp::STT type, elfcpp::STB binding, | |
289 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 290 | { |
2ea97941 | 291 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
292 | this->value_ = 0; |
293 | this->symsize_ = 0; | |
294 | } | |
295 | ||
6d1c4efb ILT |
296 | // Return an allocated string holding the symbol's name as |
297 | // name@version. This is used for relocatable links. | |
298 | ||
299 | std::string | |
300 | Symbol::versioned_name() const | |
301 | { | |
302 | gold_assert(this->version_ != NULL); | |
303 | std::string ret = this->name_; | |
304 | ret.push_back('@'); | |
305 | if (this->is_def_) | |
306 | ret.push_back('@'); | |
307 | ret += this->version_; | |
308 | return ret; | |
309 | } | |
310 | ||
8a5e3e08 ILT |
311 | // Return true if SHNDX represents a common symbol. |
312 | ||
313 | bool | |
2ea97941 | 314 | Symbol::is_common_shndx(unsigned int shndx) |
8a5e3e08 | 315 | { |
2ea97941 ILT |
316 | return (shndx == elfcpp::SHN_COMMON |
317 | || shndx == parameters->target().small_common_shndx() | |
318 | || shndx == parameters->target().large_common_shndx()); | |
8a5e3e08 ILT |
319 | } |
320 | ||
c7912668 ILT |
321 | // Allocate a common symbol. |
322 | ||
323 | template<int size> | |
324 | void | |
2ea97941 | 325 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) |
c7912668 ILT |
326 | { |
327 | this->allocate_base_common(od); | |
2ea97941 | 328 | this->value_ = value; |
c7912668 ILT |
329 | } |
330 | ||
c82fbeee CS |
331 | // The ""'s around str ensure str is a string literal, so sizeof works. |
332 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) | |
333 | ||
436ca963 ILT |
334 | // Return true if this symbol should be added to the dynamic symbol |
335 | // table. | |
336 | ||
7b549045 | 337 | bool |
ce97fa81 | 338 | Symbol::should_add_dynsym_entry(Symbol_table* symtab) const |
436ca963 | 339 | { |
badc8139 RÁE |
340 | // If the symbol is only present on plugin files, the plugin decided we |
341 | // don't need it. | |
342 | if (!this->in_real_elf()) | |
343 | return false; | |
344 | ||
436ca963 ILT |
345 | // If the symbol is used by a dynamic relocation, we need to add it. |
346 | if (this->needs_dynsym_entry()) | |
347 | return true; | |
348 | ||
6d03d481 ST |
349 | // If this symbol's section is not added, the symbol need not be added. |
350 | // The section may have been GCed. Note that export_dynamic is being | |
351 | // overridden here. This should not be done for shared objects. | |
352 | if (parameters->options().gc_sections() | |
353 | && !parameters->options().shared() | |
354 | && this->source() == Symbol::FROM_OBJECT | |
355 | && !this->object()->is_dynamic()) | |
356 | { | |
357 | Relobj* relobj = static_cast<Relobj*>(this->object()); | |
358 | bool is_ordinary; | |
2ea97941 ILT |
359 | unsigned int shndx = this->shndx(&is_ordinary); |
360 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF | |
ce97fa81 ST |
361 | && !relobj->is_section_included(shndx) |
362 | && !symtab->is_section_folded(relobj, shndx)) | |
6d03d481 ST |
363 | return false; |
364 | } | |
365 | ||
31821be0 CC |
366 | // If the symbol was forced dynamic in a --dynamic-list file |
367 | // or an --export-dynamic-symbol option, add it. | |
b24fdbf5 CC |
368 | if (!this->is_from_dynobj() |
369 | && (parameters->options().in_dynamic_list(this->name()) | |
370 | || parameters->options().is_export_dynamic_symbol(this->name()))) | |
31821be0 CC |
371 | { |
372 | if (!this->is_forced_local()) | |
373 | return true; | |
374 | gold_warning(_("Cannot export local symbol '%s'"), | |
375 | this->demangled_name().c_str()); | |
376 | return false; | |
377 | } | |
378 | ||
55a93433 ILT |
379 | // If the symbol was forced local in a version script, do not add it. |
380 | if (this->is_forced_local()) | |
381 | return false; | |
382 | ||
c82fbeee CS |
383 | // If dynamic-list-data was specified, add any STT_OBJECT. |
384 | if (parameters->options().dynamic_list_data() | |
385 | && !this->is_from_dynobj() | |
386 | && this->type() == elfcpp::STT_OBJECT) | |
387 | return true; | |
388 | ||
389 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. | |
390 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. | |
391 | if ((parameters->options().dynamic_list_cpp_new() | |
392 | || parameters->options().dynamic_list_cpp_typeinfo()) | |
393 | && !this->is_from_dynobj()) | |
394 | { | |
395 | // TODO(csilvers): We could probably figure out if we're an operator | |
396 | // new/delete or typeinfo without the need to demangle. | |
2ea97941 ILT |
397 | char* demangled_name = cplus_demangle(this->name(), |
398 | DMGL_ANSI | DMGL_PARAMS); | |
399 | if (demangled_name == NULL) | |
c82fbeee CS |
400 | { |
401 | // Not a C++ symbol, so it can't satisfy these flags | |
402 | } | |
403 | else if (parameters->options().dynamic_list_cpp_new() | |
2ea97941 ILT |
404 | && (strprefix(demangled_name, "operator new") |
405 | || strprefix(demangled_name, "operator delete"))) | |
c82fbeee | 406 | { |
2ea97941 | 407 | free(demangled_name); |
c82fbeee CS |
408 | return true; |
409 | } | |
410 | else if (parameters->options().dynamic_list_cpp_typeinfo() | |
2ea97941 ILT |
411 | && (strprefix(demangled_name, "typeinfo name for") |
412 | || strprefix(demangled_name, "typeinfo for"))) | |
c82fbeee | 413 | { |
2ea97941 | 414 | free(demangled_name); |
c82fbeee CS |
415 | return true; |
416 | } | |
417 | else | |
2ea97941 | 418 | free(demangled_name); |
c82fbeee CS |
419 | } |
420 | ||
436ca963 | 421 | // If exporting all symbols or building a shared library, |
4b889c30 | 422 | // or the symbol should be globally unique (GNU_UNIQUE), |
436ca963 ILT |
423 | // and the symbol is defined in a regular object and is |
424 | // externally visible, we need to add it. | |
4b889c30 IC |
425 | if ((parameters->options().export_dynamic() |
426 | || parameters->options().shared() | |
427 | || (parameters->options().gnu_unique() | |
428 | && this->binding() == elfcpp::STB_GNU_UNIQUE)) | |
436ca963 | 429 | && !this->is_from_dynobj() |
f3ae1b28 | 430 | && !this->is_undefined() |
436ca963 ILT |
431 | && this->is_externally_visible()) |
432 | return true; | |
433 | ||
434 | return false; | |
435 | } | |
436 | ||
b3b74ddc ILT |
437 | // Return true if the final value of this symbol is known at link |
438 | // time. | |
439 | ||
440 | bool | |
441 | Symbol::final_value_is_known() const | |
442 | { | |
443 | // If we are not generating an executable, then no final values are | |
a6a17750 CC |
444 | // known, since they will change at runtime, with the exception of |
445 | // TLS symbols in a position-independent executable. | |
446 | if ((parameters->options().output_is_position_independent() | |
447 | || parameters->options().relocatable()) | |
448 | && !(this->type() == elfcpp::STT_TLS | |
449 | && parameters->options().pie())) | |
b3b74ddc ILT |
450 | return false; |
451 | ||
f3e9c5c5 ILT |
452 | // If the symbol is not from an object file, and is not undefined, |
453 | // then it is defined, and known. | |
b3b74ddc | 454 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
455 | { |
456 | if (this->source_ != IS_UNDEFINED) | |
457 | return true; | |
458 | } | |
459 | else | |
460 | { | |
461 | // If the symbol is from a dynamic object, then the final value | |
462 | // is not known. | |
463 | if (this->object()->is_dynamic()) | |
464 | return false; | |
b3b74ddc | 465 | |
f3e9c5c5 ILT |
466 | // If the symbol is not undefined (it is defined or common), |
467 | // then the final value is known. | |
468 | if (!this->is_undefined()) | |
469 | return true; | |
470 | } | |
b3b74ddc ILT |
471 | |
472 | // If the symbol is undefined, then whether the final value is known | |
473 | // depends on whether we are doing a static link. If we are doing a | |
474 | // dynamic link, then the final value could be filled in at runtime. | |
475 | // This could reasonably be the case for a weak undefined symbol. | |
476 | return parameters->doing_static_link(); | |
477 | } | |
478 | ||
77e65537 | 479 | // Return the output section where this symbol is defined. |
a445fddf | 480 | |
77e65537 ILT |
481 | Output_section* |
482 | Symbol::output_section() const | |
a445fddf ILT |
483 | { |
484 | switch (this->source_) | |
485 | { | |
486 | case FROM_OBJECT: | |
77e65537 | 487 | { |
2ea97941 ILT |
488 | unsigned int shndx = this->u_.from_object.shndx; |
489 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) | |
77e65537 ILT |
490 | { |
491 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 492 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 493 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
2ea97941 | 494 | return relobj->output_section(shndx); |
77e65537 ILT |
495 | } |
496 | return NULL; | |
497 | } | |
498 | ||
a445fddf | 499 | case IN_OUTPUT_DATA: |
77e65537 ILT |
500 | return this->u_.in_output_data.output_data->output_section(); |
501 | ||
a445fddf | 502 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
503 | case IS_CONSTANT: |
504 | case IS_UNDEFINED: | |
77e65537 ILT |
505 | return NULL; |
506 | ||
507 | default: | |
508 | gold_unreachable(); | |
509 | } | |
510 | } | |
511 | ||
512 | // Set the symbol's output section. This is used for symbols defined | |
513 | // in scripts. This should only be called after the symbol table has | |
514 | // been finalized. | |
515 | ||
516 | void | |
517 | Symbol::set_output_section(Output_section* os) | |
518 | { | |
519 | switch (this->source_) | |
520 | { | |
521 | case FROM_OBJECT: | |
522 | case IN_OUTPUT_DATA: | |
523 | gold_assert(this->output_section() == os); | |
524 | break; | |
f3e9c5c5 | 525 | case IS_CONSTANT: |
77e65537 ILT |
526 | this->source_ = IN_OUTPUT_DATA; |
527 | this->u_.in_output_data.output_data = os; | |
528 | this->u_.in_output_data.offset_is_from_end = false; | |
529 | break; | |
530 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 531 | case IS_UNDEFINED: |
a445fddf ILT |
532 | default: |
533 | gold_unreachable(); | |
534 | } | |
535 | } | |
536 | ||
d1bddd3c CC |
537 | // Set the symbol's output segment. This is used for pre-defined |
538 | // symbols whose segments aren't known until after layout is done | |
539 | // (e.g., __ehdr_start). | |
540 | ||
541 | void | |
542 | Symbol::set_output_segment(Output_segment* os, Segment_offset_base base) | |
543 | { | |
544 | gold_assert(this->is_predefined_); | |
545 | this->source_ = IN_OUTPUT_SEGMENT; | |
546 | this->u_.in_output_segment.output_segment = os; | |
547 | this->u_.in_output_segment.offset_base = base; | |
548 | } | |
549 | ||
550 | // Set the symbol to undefined. This is used for pre-defined | |
551 | // symbols whose segments aren't known until after layout is done | |
552 | // (e.g., __ehdr_start). | |
553 | ||
554 | void | |
555 | Symbol::set_undefined() | |
556 | { | |
d1bddd3c CC |
557 | this->source_ = IS_UNDEFINED; |
558 | this->is_predefined_ = false; | |
559 | } | |
560 | ||
14bfc3f5 ILT |
561 | // Class Symbol_table. |
562 | ||
09124467 | 563 | Symbol_table::Symbol_table(unsigned int count, |
2ea97941 | 564 | const Version_script_info& version_script) |
6d013333 | 565 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
8a5e3e08 ILT |
566 | forwarders_(), commons_(), tls_commons_(), small_commons_(), |
567 | large_commons_(), forced_locals_(), warnings_(), | |
2ea97941 | 568 | version_script_(version_script), gc_(NULL), icf_(NULL) |
14bfc3f5 | 569 | { |
6d013333 | 570 | namepool_.reserve(count); |
14bfc3f5 ILT |
571 | } |
572 | ||
573 | Symbol_table::~Symbol_table() | |
574 | { | |
575 | } | |
576 | ||
ad8f37d1 ILT |
577 | // The symbol table key equality function. This is called with |
578 | // Stringpool keys. | |
14bfc3f5 | 579 | |
ad8f37d1 | 580 | inline bool |
14bfc3f5 ILT |
581 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
582 | const Symbol_table_key& k2) const | |
583 | { | |
584 | return k1.first == k2.first && k1.second == k2.second; | |
585 | } | |
586 | ||
ef15dade | 587 | bool |
efc6fa12 | 588 | Symbol_table::is_section_folded(Relobj* obj, unsigned int shndx) const |
ef15dade | 589 | { |
032ce4e9 | 590 | return (parameters->options().icf_enabled() |
2ea97941 | 591 | && this->icf_->is_section_folded(obj, shndx)); |
ef15dade ST |
592 | } |
593 | ||
31821be0 CC |
594 | // For symbols that have been listed with a -u or --export-dynamic-symbol |
595 | // option, add them to the work list to avoid gc'ing them. | |
6d03d481 ST |
596 | |
597 | void | |
88a4108b | 598 | Symbol_table::gc_mark_undef_symbols(Layout* layout) |
6d03d481 ST |
599 | { |
600 | for (options::String_set::const_iterator p = | |
601 | parameters->options().undefined_begin(); | |
602 | p != parameters->options().undefined_end(); | |
603 | ++p) | |
604 | { | |
2ea97941 ILT |
605 | const char* name = p->c_str(); |
606 | Symbol* sym = this->lookup(name); | |
ca09d69a | 607 | gold_assert(sym != NULL); |
6d03d481 ST |
608 | if (sym->source() == Symbol::FROM_OBJECT |
609 | && !sym->object()->is_dynamic()) | |
610 | { | |
e81fea4d | 611 | this->gc_mark_symbol(sym); |
6d03d481 ST |
612 | } |
613 | } | |
88a4108b | 614 | |
31821be0 CC |
615 | for (options::String_set::const_iterator p = |
616 | parameters->options().export_dynamic_symbol_begin(); | |
617 | p != parameters->options().export_dynamic_symbol_end(); | |
618 | ++p) | |
619 | { | |
620 | const char* name = p->c_str(); | |
621 | Symbol* sym = this->lookup(name); | |
1d5dfe78 CC |
622 | // It's not an error if a symbol named by --export-dynamic-symbol |
623 | // is undefined. | |
624 | if (sym != NULL | |
625 | && sym->source() == Symbol::FROM_OBJECT | |
31821be0 CC |
626 | && !sym->object()->is_dynamic()) |
627 | { | |
e81fea4d | 628 | this->gc_mark_symbol(sym); |
31821be0 CC |
629 | } |
630 | } | |
631 | ||
88a4108b ILT |
632 | for (Script_options::referenced_const_iterator p = |
633 | layout->script_options()->referenced_begin(); | |
634 | p != layout->script_options()->referenced_end(); | |
635 | ++p) | |
636 | { | |
637 | Symbol* sym = this->lookup(p->c_str()); | |
638 | gold_assert(sym != NULL); | |
639 | if (sym->source() == Symbol::FROM_OBJECT | |
640 | && !sym->object()->is_dynamic()) | |
641 | { | |
e81fea4d | 642 | this->gc_mark_symbol(sym); |
88a4108b ILT |
643 | } |
644 | } | |
6d03d481 ST |
645 | } |
646 | ||
647 | void | |
7257cc92 | 648 | Symbol_table::gc_mark_symbol(Symbol* sym) |
6d03d481 | 649 | { |
7257cc92 | 650 | // Add the object and section to the work list. |
7257cc92 ST |
651 | bool is_ordinary; |
652 | unsigned int shndx = sym->shndx(&is_ordinary); | |
efc6fa12 | 653 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF && !sym->object()->is_dynamic()) |
6d03d481 | 654 | { |
7257cc92 | 655 | gold_assert(this->gc_!= NULL); |
efc6fa12 CC |
656 | Relobj* relobj = static_cast<Relobj*>(sym->object()); |
657 | this->gc_->worklist().push_back(Section_id(relobj, shndx)); | |
6d03d481 | 658 | } |
e81fea4d | 659 | parameters->target().gc_mark_symbol(this, sym); |
6d03d481 ST |
660 | } |
661 | ||
662 | // When doing garbage collection, keep symbols that have been seen in | |
663 | // dynamic objects. | |
664 | inline void | |
665 | Symbol_table::gc_mark_dyn_syms(Symbol* sym) | |
666 | { | |
667 | if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT | |
668 | && !sym->object()->is_dynamic()) | |
7257cc92 | 669 | this->gc_mark_symbol(sym); |
6d03d481 ST |
670 | } |
671 | ||
dd8670e5 | 672 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
673 | |
674 | void | |
675 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
676 | { | |
a3ad94ed ILT |
677 | gold_assert(from != to); |
678 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
679 | this->forwarders_[from] = to; |
680 | from->set_forwarder(); | |
681 | } | |
682 | ||
61ba1cf9 ILT |
683 | // Resolve the forwards from FROM, returning the real symbol. |
684 | ||
14bfc3f5 | 685 | Symbol* |
c06b7b0b | 686 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 687 | { |
a3ad94ed | 688 | gold_assert(from->is_forwarder()); |
c06b7b0b | 689 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 690 | this->forwarders_.find(from); |
a3ad94ed | 691 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
692 | return p->second; |
693 | } | |
694 | ||
61ba1cf9 ILT |
695 | // Look up a symbol by name. |
696 | ||
697 | Symbol* | |
2ea97941 | 698 | Symbol_table::lookup(const char* name, const char* version) const |
61ba1cf9 | 699 | { |
f0641a0b | 700 | Stringpool::Key name_key; |
2ea97941 ILT |
701 | name = this->namepool_.find(name, &name_key); |
702 | if (name == NULL) | |
61ba1cf9 | 703 | return NULL; |
f0641a0b ILT |
704 | |
705 | Stringpool::Key version_key = 0; | |
2ea97941 | 706 | if (version != NULL) |
61ba1cf9 | 707 | { |
2ea97941 ILT |
708 | version = this->namepool_.find(version, &version_key); |
709 | if (version == NULL) | |
61ba1cf9 ILT |
710 | return NULL; |
711 | } | |
712 | ||
f0641a0b | 713 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
714 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
715 | if (p == this->table_.end()) | |
716 | return NULL; | |
717 | return p->second; | |
718 | } | |
719 | ||
14bfc3f5 ILT |
720 | // Resolve a Symbol with another Symbol. This is only used in the |
721 | // unusual case where there are references to both an unversioned | |
722 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
723 | // version is the default version. Because this is unusual, we do |
724 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 725 | |
1564db8d | 726 | template<int size, bool big_endian> |
14bfc3f5 | 727 | void |
95d14cd3 | 728 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 729 | { |
1564db8d ILT |
730 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
731 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 732 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
733 | esym.put_st_value(from->value()); |
734 | esym.put_st_size(from->symsize()); | |
735 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 736 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e | 737 | bool is_ordinary; |
2ea97941 ILT |
738 | unsigned int shndx = from->shndx(&is_ordinary); |
739 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
b45e00b3 | 740 | from->version(), true); |
1ebd95fd ILT |
741 | if (from->in_reg()) |
742 | to->set_in_reg(); | |
743 | if (from->in_dyn()) | |
744 | to->set_in_dyn(); | |
6d03d481 ST |
745 | if (parameters->options().gc_sections()) |
746 | this->gc_mark_dyn_syms(to); | |
14bfc3f5 ILT |
747 | } |
748 | ||
0602e05a ILT |
749 | // Record that a symbol is forced to be local by a version script or |
750 | // by visibility. | |
55a93433 ILT |
751 | |
752 | void | |
753 | Symbol_table::force_local(Symbol* sym) | |
754 | { | |
755 | if (!sym->is_defined() && !sym->is_common()) | |
756 | return; | |
757 | if (sym->is_forced_local()) | |
758 | { | |
759 | // We already got this one. | |
760 | return; | |
761 | } | |
762 | sym->set_is_forced_local(); | |
763 | this->forced_locals_.push_back(sym); | |
764 | } | |
765 | ||
0864d551 ILT |
766 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
767 | // is only called for undefined symbols, when at least one --wrap | |
768 | // option was used. | |
769 | ||
770 | const char* | |
2ea97941 | 771 | Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key) |
0864d551 ILT |
772 | { |
773 | // For some targets, we need to ignore a specific character when | |
774 | // wrapping, and add it back later. | |
775 | char prefix = '\0'; | |
2ea97941 | 776 | if (name[0] == parameters->target().wrap_char()) |
0864d551 | 777 | { |
2ea97941 ILT |
778 | prefix = name[0]; |
779 | ++name; | |
0864d551 ILT |
780 | } |
781 | ||
2ea97941 | 782 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
783 | { |
784 | // Turn NAME into __wrap_NAME. | |
785 | std::string s; | |
786 | if (prefix != '\0') | |
787 | s += prefix; | |
788 | s += "__wrap_"; | |
2ea97941 | 789 | s += name; |
0864d551 ILT |
790 | |
791 | // This will give us both the old and new name in NAMEPOOL_, but | |
792 | // that is OK. Only the versions we need will wind up in the | |
793 | // real string table in the output file. | |
794 | return this->namepool_.add(s.c_str(), true, name_key); | |
795 | } | |
796 | ||
797 | const char* const real_prefix = "__real_"; | |
798 | const size_t real_prefix_length = strlen(real_prefix); | |
2ea97941 ILT |
799 | if (strncmp(name, real_prefix, real_prefix_length) == 0 |
800 | && parameters->options().is_wrap(name + real_prefix_length)) | |
0864d551 ILT |
801 | { |
802 | // Turn __real_NAME into NAME. | |
803 | std::string s; | |
804 | if (prefix != '\0') | |
805 | s += prefix; | |
2ea97941 | 806 | s += name + real_prefix_length; |
0864d551 ILT |
807 | return this->namepool_.add(s.c_str(), true, name_key); |
808 | } | |
809 | ||
2ea97941 | 810 | return name; |
0864d551 ILT |
811 | } |
812 | ||
8c500701 ILT |
813 | // This is called when we see a symbol NAME/VERSION, and the symbol |
814 | // already exists in the symbol table, and VERSION is marked as being | |
815 | // the default version. SYM is the NAME/VERSION symbol we just added. | |
816 | // DEFAULT_IS_NEW is true if this is the first time we have seen the | |
817 | // symbol NAME/NULL. PDEF points to the entry for NAME/NULL. | |
818 | ||
819 | template<int size, bool big_endian> | |
820 | void | |
821 | Symbol_table::define_default_version(Sized_symbol<size>* sym, | |
822 | bool default_is_new, | |
823 | Symbol_table_type::iterator pdef) | |
824 | { | |
825 | if (default_is_new) | |
826 | { | |
827 | // This is the first time we have seen NAME/NULL. Make | |
828 | // NAME/NULL point to NAME/VERSION, and mark SYM as the default | |
829 | // version. | |
830 | pdef->second = sym; | |
831 | sym->set_is_default(); | |
832 | } | |
833 | else if (pdef->second == sym) | |
834 | { | |
835 | // NAME/NULL already points to NAME/VERSION. Don't mark the | |
836 | // symbol as the default if it is not already the default. | |
837 | } | |
838 | else | |
839 | { | |
840 | // This is the unfortunate case where we already have entries | |
841 | // for both NAME/VERSION and NAME/NULL. We now see a symbol | |
842 | // NAME/VERSION where VERSION is the default version. We have | |
843 | // already resolved this new symbol with the existing | |
844 | // NAME/VERSION symbol. | |
845 | ||
846 | // It's possible that NAME/NULL and NAME/VERSION are both | |
847 | // defined in regular objects. This can only happen if one | |
848 | // object file defines foo and another defines foo@@ver. This | |
849 | // is somewhat obscure, but we call it a multiple definition | |
850 | // error. | |
851 | ||
852 | // It's possible that NAME/NULL actually has a version, in which | |
853 | // case it won't be the same as VERSION. This happens with | |
854 | // ver_test_7.so in the testsuite for the symbol t2_2. We see | |
855 | // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We | |
856 | // then see an unadorned t2_2 in an object file and give it | |
857 | // version VER1 from the version script. This looks like a | |
858 | // default definition for VER1, so it looks like we should merge | |
859 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's | |
860 | // not obvious that this is an error, either. So we just punt. | |
861 | ||
862 | // If one of the symbols has non-default visibility, and the | |
863 | // other is defined in a shared object, then they are different | |
864 | // symbols. | |
865 | ||
866 | // Otherwise, we just resolve the symbols as though they were | |
867 | // the same. | |
868 | ||
869 | if (pdef->second->version() != NULL) | |
870 | gold_assert(pdef->second->version() != sym->version()); | |
871 | else if (sym->visibility() != elfcpp::STV_DEFAULT | |
872 | && pdef->second->is_from_dynobj()) | |
873 | ; | |
874 | else if (pdef->second->visibility() != elfcpp::STV_DEFAULT | |
875 | && sym->is_from_dynobj()) | |
876 | ; | |
877 | else | |
878 | { | |
879 | const Sized_symbol<size>* symdef; | |
880 | symdef = this->get_sized_symbol<size>(pdef->second); | |
881 | Symbol_table::resolve<size, big_endian>(sym, symdef); | |
882 | this->make_forwarder(pdef->second, sym); | |
883 | pdef->second = sym; | |
884 | sym->set_is_default(); | |
885 | } | |
886 | } | |
887 | } | |
888 | ||
14bfc3f5 ILT |
889 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
890 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
891 | // whether this is the default version. ST_SHNDX is the symbol's |
892 | // section index; IS_ORDINARY is whether this is a normal section | |
893 | // rather than a special code. | |
14bfc3f5 | 894 | |
8781f709 ILT |
895 | // If IS_DEFAULT_VERSION is true, then this is the definition of a |
896 | // default version of a symbol. That means that any lookup of | |
897 | // NAME/NULL and any lookup of NAME/VERSION should always return the | |
898 | // same symbol. This is obvious for references, but in particular we | |
899 | // want to do this for definitions: overriding NAME/NULL should also | |
900 | // override NAME/VERSION. If we don't do that, it would be very hard | |
901 | // to override functions in a shared library which uses versioning. | |
14bfc3f5 ILT |
902 | |
903 | // We implement this by simply making both entries in the hash table | |
904 | // point to the same Symbol structure. That is easy enough if this is | |
905 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
906 | // that we have seen both already, in which case they will both have | |
907 | // independent entries in the symbol table. We can't simply change | |
908 | // the symbol table entry, because we have pointers to the entries | |
909 | // attached to the object files. So we mark the entry attached to the | |
910 | // object file as a forwarder, and record it in the forwarders_ map. | |
911 | // Note that entries in the hash table will never be marked as | |
912 | // forwarders. | |
70e654ba | 913 | // |
d491d34e ILT |
914 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
915 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
916 | // for a special section code. ST_SHNDX may be modified if the symbol | |
917 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
918 | |
919 | template<int size, bool big_endian> | |
aeddab66 | 920 | Sized_symbol<size>* |
2ea97941 | 921 | Symbol_table::add_from_object(Object* object, |
ca09d69a | 922 | const char* name, |
f0641a0b | 923 | Stringpool::Key name_key, |
ca09d69a | 924 | const char* version, |
f0641a0b | 925 | Stringpool::Key version_key, |
8781f709 | 926 | bool is_default_version, |
70e654ba | 927 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
928 | unsigned int st_shndx, |
929 | bool is_ordinary, | |
930 | unsigned int orig_st_shndx) | |
14bfc3f5 | 931 | { |
c5818ff1 | 932 | // Print a message if this symbol is being traced. |
2ea97941 | 933 | if (parameters->options().is_trace_symbol(name)) |
c5818ff1 | 934 | { |
d491d34e | 935 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
2ea97941 | 936 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
c5818ff1 | 937 | else |
2ea97941 | 938 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); |
c5818ff1 CC |
939 | } |
940 | ||
0864d551 ILT |
941 | // For an undefined symbol, we may need to adjust the name using |
942 | // --wrap. | |
d491d34e | 943 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 944 | && parameters->options().any_wrap()) |
0864d551 | 945 | { |
2ea97941 ILT |
946 | const char* wrap_name = this->wrap_symbol(name, &name_key); |
947 | if (wrap_name != name) | |
0864d551 ILT |
948 | { |
949 | // If we see a reference to malloc with version GLIBC_2.0, | |
950 | // and we turn it into a reference to __wrap_malloc, then we | |
951 | // discard the version number. Otherwise the user would be | |
952 | // required to specify the correct version for | |
953 | // __wrap_malloc. | |
2ea97941 | 954 | version = NULL; |
0864d551 | 955 | version_key = 0; |
2ea97941 | 956 | name = wrap_name; |
0864d551 ILT |
957 | } |
958 | } | |
959 | ||
14bfc3f5 ILT |
960 | Symbol* const snull = NULL; |
961 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
962 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
963 | snull)); | |
14bfc3f5 | 964 | |
8781f709 | 965 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
14bfc3f5 | 966 | std::make_pair(this->table_.end(), false); |
8781f709 | 967 | if (is_default_version) |
14bfc3f5 | 968 | { |
f0641a0b | 969 | const Stringpool::Key vnull_key = 0; |
8781f709 ILT |
970 | insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key, |
971 | vnull_key), | |
972 | snull)); | |
14bfc3f5 ILT |
973 | } |
974 | ||
975 | // ins.first: an iterator, which is a pointer to a pair. | |
976 | // ins.first->first: the key (a pair of name and version). | |
977 | // ins.first->second: the value (Symbol*). | |
978 | // ins.second: true if new entry was inserted, false if not. | |
979 | ||
1564db8d | 980 | Sized_symbol<size>* ret; |
ead1e424 ILT |
981 | bool was_undefined; |
982 | bool was_common; | |
14bfc3f5 ILT |
983 | if (!ins.second) |
984 | { | |
985 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 986 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 987 | gold_assert(ret != NULL); |
ead1e424 ILT |
988 | |
989 | was_undefined = ret->is_undefined(); | |
1707f183 CC |
990 | // Commons from plugins are just placeholders. |
991 | was_common = ret->is_common() && ret->object()->pluginobj() == NULL; | |
ead1e424 | 992 | |
2ea97941 | 993 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
b45e00b3 | 994 | version, is_default_version); |
6d03d481 ST |
995 | if (parameters->options().gc_sections()) |
996 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 | 997 | |
8781f709 ILT |
998 | if (is_default_version) |
999 | this->define_default_version<size, big_endian>(ret, insdefault.second, | |
1000 | insdefault.first); | |
3ac0a36c | 1001 | else |
b45e00b3 | 1002 | { |
b45e00b3 | 1003 | bool dummy; |
3ac0a36c CC |
1004 | if (version != NULL |
1005 | && ret->source() == Symbol::FROM_OBJECT | |
b45e00b3 CC |
1006 | && ret->object() == object |
1007 | && is_ordinary | |
3ac0a36c CC |
1008 | && ret->shndx(&dummy) == st_shndx |
1009 | && ret->is_default()) | |
b45e00b3 | 1010 | { |
3ac0a36c CC |
1011 | // We have seen NAME/VERSION already, and marked it as the |
1012 | // default version, but now we see a definition for | |
1013 | // NAME/VERSION that is not the default version. This can | |
1014 | // happen when the assembler generates two symbols for | |
1015 | // a symbol as a result of a ".symver foo,foo@VER" | |
1016 | // directive. We see the first unversioned symbol and | |
1017 | // we may mark it as the default version (from a | |
1018 | // version script); then we see the second versioned | |
1019 | // symbol and we need to override the first. | |
1020 | // In any other case, the two symbols should have generated | |
1021 | // a multiple definition error. | |
1022 | // (See PR gold/18703.) | |
b45e00b3 CC |
1023 | ret->set_is_not_default(); |
1024 | const Stringpool::Key vnull_key = 0; | |
1025 | this->table_.erase(std::make_pair(name_key, vnull_key)); | |
1026 | } | |
1027 | } | |
14bfc3f5 ILT |
1028 | } |
1029 | else | |
1030 | { | |
1031 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 1032 | gold_assert(ins.first->second == NULL); |
ead1e424 | 1033 | |
8781f709 | 1034 | if (is_default_version && !insdefault.second) |
14bfc3f5 | 1035 | { |
14b31740 ILT |
1036 | // We already have an entry for NAME/NULL. If we override |
1037 | // it, then change it to NAME/VERSION. | |
8781f709 | 1038 | ret = this->get_sized_symbol<size>(insdefault.first->second); |
18e6b24e ILT |
1039 | |
1040 | was_undefined = ret->is_undefined(); | |
1707f183 CC |
1041 | // Commons from plugins are just placeholders. |
1042 | was_common = ret->is_common() && ret->object()->pluginobj() == NULL; | |
18e6b24e | 1043 | |
2ea97941 | 1044 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
b45e00b3 | 1045 | version, is_default_version); |
6d03d481 ST |
1046 | if (parameters->options().gc_sections()) |
1047 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 ILT |
1048 | ins.first->second = ret; |
1049 | } | |
1050 | else | |
1051 | { | |
18e6b24e ILT |
1052 | was_undefined = false; |
1053 | was_common = false; | |
1054 | ||
f6ce93d6 | 1055 | Sized_target<size, big_endian>* target = |
029ba973 | 1056 | parameters->sized_target<size, big_endian>(); |
1564db8d ILT |
1057 | if (!target->has_make_symbol()) |
1058 | ret = new Sized_symbol<size>(); | |
1059 | else | |
14bfc3f5 | 1060 | { |
1564db8d ILT |
1061 | ret = target->make_symbol(); |
1062 | if (ret == NULL) | |
14bfc3f5 ILT |
1063 | { |
1064 | // This means that we don't want a symbol table | |
1065 | // entry after all. | |
8781f709 | 1066 | if (!is_default_version) |
14bfc3f5 ILT |
1067 | this->table_.erase(ins.first); |
1068 | else | |
1069 | { | |
8781f709 ILT |
1070 | this->table_.erase(insdefault.first); |
1071 | // Inserting INSDEFAULT invalidated INS. | |
f0641a0b ILT |
1072 | this->table_.erase(std::make_pair(name_key, |
1073 | version_key)); | |
14bfc3f5 ILT |
1074 | } |
1075 | return NULL; | |
1076 | } | |
1077 | } | |
14bfc3f5 | 1078 | |
2ea97941 | 1079 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 1080 | |
14bfc3f5 | 1081 | ins.first->second = ret; |
8781f709 | 1082 | if (is_default_version) |
14bfc3f5 ILT |
1083 | { |
1084 | // This is the first time we have seen NAME/NULL. Point | |
1085 | // it at the new entry for NAME/VERSION. | |
8781f709 ILT |
1086 | gold_assert(insdefault.second); |
1087 | insdefault.first->second = ret; | |
14bfc3f5 ILT |
1088 | } |
1089 | } | |
8c500701 | 1090 | |
8781f709 | 1091 | if (is_default_version) |
8c500701 | 1092 | ret->set_is_default(); |
14bfc3f5 ILT |
1093 | } |
1094 | ||
ead1e424 ILT |
1095 | // Record every time we see a new undefined symbol, to speed up |
1096 | // archive groups. | |
1097 | if (!was_undefined && ret->is_undefined()) | |
0f3b89d8 ILT |
1098 | { |
1099 | ++this->saw_undefined_; | |
1100 | if (parameters->options().has_plugins()) | |
1101 | parameters->options().plugins()->new_undefined_symbol(ret); | |
1102 | } | |
ead1e424 ILT |
1103 | |
1104 | // Keep track of common symbols, to speed up common symbol | |
1707f183 CC |
1105 | // allocation. Don't record commons from plugin objects; |
1106 | // we need to wait until we see the real symbol in the | |
1107 | // replacement file. | |
1108 | if (!was_common && ret->is_common() && ret->object()->pluginobj() == NULL) | |
155a0dd7 | 1109 | { |
8a5e3e08 | 1110 | if (ret->type() == elfcpp::STT_TLS) |
155a0dd7 | 1111 | this->tls_commons_.push_back(ret); |
8a5e3e08 ILT |
1112 | else if (!is_ordinary |
1113 | && st_shndx == parameters->target().small_common_shndx()) | |
1114 | this->small_commons_.push_back(ret); | |
1115 | else if (!is_ordinary | |
1116 | && st_shndx == parameters->target().large_common_shndx()) | |
1117 | this->large_commons_.push_back(ret); | |
1118 | else | |
1119 | this->commons_.push_back(ret); | |
155a0dd7 | 1120 | } |
ead1e424 | 1121 | |
0602e05a ILT |
1122 | // If we're not doing a relocatable link, then any symbol with |
1123 | // hidden or internal visibility is local. | |
1124 | if ((ret->visibility() == elfcpp::STV_HIDDEN | |
1125 | || ret->visibility() == elfcpp::STV_INTERNAL) | |
1126 | && (ret->binding() == elfcpp::STB_GLOBAL | |
adcf2816 | 1127 | || ret->binding() == elfcpp::STB_GNU_UNIQUE |
0602e05a ILT |
1128 | || ret->binding() == elfcpp::STB_WEAK) |
1129 | && !parameters->options().relocatable()) | |
1130 | this->force_local(ret); | |
1131 | ||
14bfc3f5 ILT |
1132 | return ret; |
1133 | } | |
1134 | ||
f6ce93d6 | 1135 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
1136 | |
1137 | template<int size, bool big_endian> | |
1138 | void | |
dbe717ef | 1139 | Symbol_table::add_from_relobj( |
6fa2a40b | 1140 | Sized_relobj_file<size, big_endian>* relobj, |
f6ce93d6 | 1141 | const unsigned char* syms, |
14bfc3f5 | 1142 | size_t count, |
d491d34e | 1143 | size_t symndx_offset, |
14bfc3f5 ILT |
1144 | const char* sym_names, |
1145 | size_t sym_name_size, | |
6fa2a40b | 1146 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
ca09d69a | 1147 | size_t* defined) |
14bfc3f5 | 1148 | { |
92de84a6 ILT |
1149 | *defined = 0; |
1150 | ||
8851ecca | 1151 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 1152 | |
a783673b ILT |
1153 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
1154 | ||
88dd47ac ILT |
1155 | const bool just_symbols = relobj->just_symbols(); |
1156 | ||
f6ce93d6 | 1157 | const unsigned char* p = syms; |
a783673b | 1158 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 1159 | { |
92de84a6 ILT |
1160 | (*sympointers)[i] = NULL; |
1161 | ||
14bfc3f5 ILT |
1162 | elfcpp::Sym<size, big_endian> sym(p); |
1163 | ||
d491d34e | 1164 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
1165 | if (st_name >= sym_name_size) |
1166 | { | |
75f2446e ILT |
1167 | relobj->error(_("bad global symbol name offset %u at %zu"), |
1168 | st_name, i); | |
1169 | continue; | |
14bfc3f5 ILT |
1170 | } |
1171 | ||
2ea97941 | 1172 | const char* name = sym_names + st_name; |
dbe717ef | 1173 | |
7cd4e5b7 AM |
1174 | if (strcmp (name, "__gnu_lto_slim") == 0) |
1175 | gold_info(_("%s: plugin needed to handle lto object"), | |
1176 | relobj->name().c_str()); | |
1177 | ||
d491d34e ILT |
1178 | bool is_ordinary; |
1179 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
1180 | sym.get_st_shndx(), | |
1181 | &is_ordinary); | |
1182 | unsigned int orig_st_shndx = st_shndx; | |
1183 | if (!is_ordinary) | |
1184 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
1185 | ||
92de84a6 ILT |
1186 | if (st_shndx != elfcpp::SHN_UNDEF) |
1187 | ++*defined; | |
1188 | ||
a783673b ILT |
1189 | // A symbol defined in a section which we are not including must |
1190 | // be treated as an undefined symbol. | |
880cd20d | 1191 | bool is_defined_in_discarded_section = false; |
a783673b | 1192 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 1193 | && is_ordinary |
ce97fa81 ST |
1194 | && !relobj->is_section_included(st_shndx) |
1195 | && !this->is_section_folded(relobj, st_shndx)) | |
880cd20d ILT |
1196 | { |
1197 | st_shndx = elfcpp::SHN_UNDEF; | |
1198 | is_defined_in_discarded_section = true; | |
1199 | } | |
a783673b | 1200 | |
14bfc3f5 ILT |
1201 | // In an object file, an '@' in the name separates the symbol |
1202 | // name from the version name. If there are two '@' characters, | |
1203 | // this is the default version. | |
2ea97941 | 1204 | const char* ver = strchr(name, '@'); |
057ead22 | 1205 | Stringpool::Key ver_key = 0; |
09124467 | 1206 | int namelen = 0; |
8781f709 ILT |
1207 | // IS_DEFAULT_VERSION: is the version default? |
1208 | // IS_FORCED_LOCAL: is the symbol forced local? | |
1209 | bool is_default_version = false; | |
1210 | bool is_forced_local = false; | |
09124467 | 1211 | |
a7dac153 CC |
1212 | // FIXME: For incremental links, we don't store version information, |
1213 | // so we need to ignore version symbols for now. | |
1214 | if (parameters->incremental_update() && ver != NULL) | |
1215 | { | |
1216 | namelen = ver - name; | |
1217 | ver = NULL; | |
1218 | } | |
1219 | ||
09124467 ILT |
1220 | if (ver != NULL) |
1221 | { | |
1222 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
2ea97941 | 1223 | namelen = ver - name; |
09124467 ILT |
1224 | ++ver; |
1225 | if (*ver == '@') | |
1226 | { | |
8781f709 | 1227 | is_default_version = true; |
09124467 ILT |
1228 | ++ver; |
1229 | } | |
057ead22 | 1230 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 1231 | } |
5871526f ILT |
1232 | // We don't want to assign a version to an undefined symbol, |
1233 | // even if it is listed in the version script. FIXME: What | |
1234 | // about a common symbol? | |
057ead22 ILT |
1235 | else |
1236 | { | |
2ea97941 | 1237 | namelen = strlen(name); |
057ead22 ILT |
1238 | if (!this->version_script_.empty() |
1239 | && st_shndx != elfcpp::SHN_UNDEF) | |
1240 | { | |
1241 | // The symbol name did not have a version, but the | |
1242 | // version script may assign a version anyway. | |
2ea97941 | 1243 | std::string version; |
98e090bd ILT |
1244 | bool is_global; |
1245 | if (this->version_script_.get_symbol_version(name, &version, | |
1246 | &is_global)) | |
057ead22 | 1247 | { |
98e090bd ILT |
1248 | if (!is_global) |
1249 | is_forced_local = true; | |
1250 | else if (!version.empty()) | |
057ead22 | 1251 | { |
2ea97941 ILT |
1252 | ver = this->namepool_.add_with_length(version.c_str(), |
1253 | version.length(), | |
057ead22 ILT |
1254 | true, |
1255 | &ver_key); | |
8781f709 | 1256 | is_default_version = true; |
057ead22 ILT |
1257 | } |
1258 | } | |
057ead22 ILT |
1259 | } |
1260 | } | |
14bfc3f5 | 1261 | |
d491d34e ILT |
1262 | elfcpp::Sym<size, big_endian>* psym = &sym; |
1263 | unsigned char symbuf[sym_size]; | |
1264 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
1265 | if (just_symbols) |
1266 | { | |
d491d34e | 1267 | memcpy(symbuf, p, sym_size); |
88dd47ac | 1268 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
9590bf25 CC |
1269 | if (orig_st_shndx != elfcpp::SHN_UNDEF |
1270 | && is_ordinary | |
1271 | && relobj->e_type() == elfcpp::ET_REL) | |
88dd47ac | 1272 | { |
9590bf25 CC |
1273 | // Symbol values in relocatable object files are section |
1274 | // relative. This is normally what we want, but since here | |
1275 | // we are converting the symbol to absolute we need to add | |
1276 | // the section address. The section address in an object | |
88dd47ac ILT |
1277 | // file is normally zero, but people can use a linker |
1278 | // script to change it. | |
d491d34e ILT |
1279 | sw.put_st_value(sym.get_st_value() |
1280 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 1281 | } |
d491d34e ILT |
1282 | st_shndx = elfcpp::SHN_ABS; |
1283 | is_ordinary = false; | |
88dd47ac ILT |
1284 | psym = &sym2; |
1285 | } | |
1286 | ||
65514900 | 1287 | // Fix up visibility if object has no-export set. |
1c74fab0 ILT |
1288 | if (relobj->no_export() |
1289 | && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary)) | |
65514900 CC |
1290 | { |
1291 | // We may have copied symbol already above. | |
1292 | if (psym != &sym2) | |
1293 | { | |
1294 | memcpy(symbuf, p, sym_size); | |
1295 | psym = &sym2; | |
1296 | } | |
1297 | ||
1298 | elfcpp::STV visibility = sym2.get_st_visibility(); | |
1299 | if (visibility == elfcpp::STV_DEFAULT | |
1300 | || visibility == elfcpp::STV_PROTECTED) | |
1301 | { | |
1302 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1303 | unsigned char nonvis = sym2.get_st_nonvis(); | |
1304 | sw.put_st_other(elfcpp::STV_HIDDEN, nonvis); | |
1305 | } | |
1306 | } | |
1307 | ||
057ead22 | 1308 | Stringpool::Key name_key; |
2ea97941 | 1309 | name = this->namepool_.add_with_length(name, namelen, true, |
057ead22 ILT |
1310 | &name_key); |
1311 | ||
aeddab66 | 1312 | Sized_symbol<size>* res; |
2ea97941 | 1313 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
8781f709 ILT |
1314 | is_default_version, *psym, st_shndx, |
1315 | is_ordinary, orig_st_shndx); | |
6d03d481 | 1316 | |
804eb480 ST |
1317 | if (is_forced_local) |
1318 | this->force_local(res); | |
1319 | ||
7257cc92 ST |
1320 | // Do not treat this symbol as garbage if this symbol will be |
1321 | // exported to the dynamic symbol table. This is true when | |
1322 | // building a shared library or using --export-dynamic and | |
1323 | // the symbol is externally visible. | |
1324 | if (parameters->options().gc_sections() | |
1325 | && res->is_externally_visible() | |
1326 | && !res->is_from_dynobj() | |
1327 | && (parameters->options().shared() | |
fd834e57 CC |
1328 | || parameters->options().export_dynamic() |
1329 | || parameters->options().in_dynamic_list(res->name()))) | |
7257cc92 | 1330 | this->gc_mark_symbol(res); |
f0641a0b | 1331 | |
880cd20d ILT |
1332 | if (is_defined_in_discarded_section) |
1333 | res->set_is_defined_in_discarded_section(); | |
1334 | ||
730cdc88 | 1335 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
1336 | } |
1337 | } | |
1338 | ||
89fc3421 CC |
1339 | // Add a symbol from a plugin-claimed file. |
1340 | ||
1341 | template<int size, bool big_endian> | |
1342 | Symbol* | |
1343 | Symbol_table::add_from_pluginobj( | |
1344 | Sized_pluginobj<size, big_endian>* obj, | |
2ea97941 | 1345 | const char* name, |
89fc3421 CC |
1346 | const char* ver, |
1347 | elfcpp::Sym<size, big_endian>* sym) | |
1348 | { | |
1349 | unsigned int st_shndx = sym->get_st_shndx(); | |
24998053 | 1350 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
89fc3421 CC |
1351 | |
1352 | Stringpool::Key ver_key = 0; | |
8781f709 ILT |
1353 | bool is_default_version = false; |
1354 | bool is_forced_local = false; | |
89fc3421 CC |
1355 | |
1356 | if (ver != NULL) | |
1357 | { | |
1358 | ver = this->namepool_.add(ver, true, &ver_key); | |
1359 | } | |
1360 | // We don't want to assign a version to an undefined symbol, | |
1361 | // even if it is listed in the version script. FIXME: What | |
1362 | // about a common symbol? | |
1363 | else | |
1364 | { | |
1365 | if (!this->version_script_.empty() | |
1366 | && st_shndx != elfcpp::SHN_UNDEF) | |
1367 | { | |
1368 | // The symbol name did not have a version, but the | |
1369 | // version script may assign a version anyway. | |
2ea97941 | 1370 | std::string version; |
98e090bd ILT |
1371 | bool is_global; |
1372 | if (this->version_script_.get_symbol_version(name, &version, | |
1373 | &is_global)) | |
89fc3421 | 1374 | { |
98e090bd ILT |
1375 | if (!is_global) |
1376 | is_forced_local = true; | |
1377 | else if (!version.empty()) | |
89fc3421 | 1378 | { |
2ea97941 ILT |
1379 | ver = this->namepool_.add_with_length(version.c_str(), |
1380 | version.length(), | |
89fc3421 CC |
1381 | true, |
1382 | &ver_key); | |
8781f709 | 1383 | is_default_version = true; |
89fc3421 CC |
1384 | } |
1385 | } | |
89fc3421 CC |
1386 | } |
1387 | } | |
1388 | ||
1389 | Stringpool::Key name_key; | |
2ea97941 | 1390 | name = this->namepool_.add(name, true, &name_key); |
89fc3421 CC |
1391 | |
1392 | Sized_symbol<size>* res; | |
2ea97941 | 1393 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
8781f709 ILT |
1394 | is_default_version, *sym, st_shndx, |
1395 | is_ordinary, st_shndx); | |
89fc3421 | 1396 | |
8781f709 | 1397 | if (is_forced_local) |
0602e05a | 1398 | this->force_local(res); |
89fc3421 CC |
1399 | |
1400 | return res; | |
1401 | } | |
1402 | ||
dbe717ef ILT |
1403 | // Add all the symbols in a dynamic object to the hash table. |
1404 | ||
1405 | template<int size, bool big_endian> | |
1406 | void | |
1407 | Symbol_table::add_from_dynobj( | |
1408 | Sized_dynobj<size, big_endian>* dynobj, | |
1409 | const unsigned char* syms, | |
1410 | size_t count, | |
1411 | const char* sym_names, | |
1412 | size_t sym_name_size, | |
1413 | const unsigned char* versym, | |
1414 | size_t versym_size, | |
92de84a6 | 1415 | const std::vector<const char*>* version_map, |
6fa2a40b | 1416 | typename Sized_relobj_file<size, big_endian>::Symbols* sympointers, |
92de84a6 | 1417 | size_t* defined) |
dbe717ef | 1418 | { |
92de84a6 ILT |
1419 | *defined = 0; |
1420 | ||
8851ecca | 1421 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1422 | |
88dd47ac ILT |
1423 | if (dynobj->just_symbols()) |
1424 | { | |
1425 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1426 | return; | |
1427 | } | |
1428 | ||
a7dac153 CC |
1429 | // FIXME: For incremental links, we don't store version information, |
1430 | // so we need to ignore version symbols for now. | |
1431 | if (parameters->incremental_update()) | |
1432 | versym = NULL; | |
1433 | ||
dbe717ef ILT |
1434 | if (versym != NULL && versym_size / 2 < count) |
1435 | { | |
75f2446e ILT |
1436 | dynobj->error(_("too few symbol versions")); |
1437 | return; | |
dbe717ef ILT |
1438 | } |
1439 | ||
1440 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1441 | ||
aeddab66 ILT |
1442 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1443 | // weak aliases. This is necessary because if the dynamic object | |
1444 | // provides the same variable under two names, one of which is a | |
1445 | // weak definition, and the regular object refers to the weak | |
1446 | // definition, we have to put both the weak definition and the | |
1447 | // strong definition into the dynamic symbol table. Given a weak | |
1448 | // definition, the only way that we can find the corresponding | |
1449 | // strong definition, if any, is to search the symbol table. | |
1450 | std::vector<Sized_symbol<size>*> object_symbols; | |
1451 | ||
dbe717ef ILT |
1452 | const unsigned char* p = syms; |
1453 | const unsigned char* vs = versym; | |
1454 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1455 | { | |
1456 | elfcpp::Sym<size, big_endian> sym(p); | |
1457 | ||
92de84a6 ILT |
1458 | if (sympointers != NULL) |
1459 | (*sympointers)[i] = NULL; | |
1460 | ||
65778909 ILT |
1461 | // Ignore symbols with local binding or that have |
1462 | // internal or hidden visibility. | |
1463 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1464 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1465 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1466 | continue; |
1467 | ||
8bdcdf2c ILT |
1468 | // A protected symbol in a shared library must be treated as a |
1469 | // normal symbol when viewed from outside the shared library. | |
1470 | // Implement this by overriding the visibility here. | |
1471 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1472 | unsigned char symbuf[sym_size]; | |
1473 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1474 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1475 | { | |
1476 | memcpy(symbuf, p, sym_size); | |
1477 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1478 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1479 | psym = &sym2; | |
1480 | } | |
1481 | ||
1482 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1483 | if (st_name >= sym_name_size) |
1484 | { | |
75f2446e ILT |
1485 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1486 | st_name, i); | |
1487 | continue; | |
dbe717ef ILT |
1488 | } |
1489 | ||
2ea97941 | 1490 | const char* name = sym_names + st_name; |
dbe717ef | 1491 | |
d491d34e | 1492 | bool is_ordinary; |
8bdcdf2c | 1493 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1494 | &is_ordinary); |
1495 | ||
92de84a6 ILT |
1496 | if (st_shndx != elfcpp::SHN_UNDEF) |
1497 | ++*defined; | |
1498 | ||
aeddab66 ILT |
1499 | Sized_symbol<size>* res; |
1500 | ||
dbe717ef ILT |
1501 | if (versym == NULL) |
1502 | { | |
1503 | Stringpool::Key name_key; | |
2ea97941 ILT |
1504 | name = this->namepool_.add(name, true, &name_key); |
1505 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1506 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1507 | st_shndx); |
dbe717ef | 1508 | } |
aeddab66 ILT |
1509 | else |
1510 | { | |
1511 | // Read the version information. | |
dbe717ef | 1512 | |
aeddab66 | 1513 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1514 | |
aeddab66 ILT |
1515 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1516 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1517 | |
aeddab66 ILT |
1518 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1519 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1520 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1521 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1522 | // for an undefined symbol. I don't know what the Sun | |
1523 | // linker will generate. | |
dbe717ef | 1524 | |
aeddab66 | 1525 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1526 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1527 | { |
1528 | // This symbol should not be visible outside the object. | |
1529 | continue; | |
1530 | } | |
64707334 | 1531 | |
aeddab66 ILT |
1532 | // At this point we are definitely going to add this symbol. |
1533 | Stringpool::Key name_key; | |
2ea97941 | 1534 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 1535 | |
aeddab66 ILT |
1536 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1537 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1538 | { | |
1539 | // This symbol does not have a version. | |
2ea97941 | 1540 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1541 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1542 | st_shndx); |
aeddab66 ILT |
1543 | } |
1544 | else | |
1545 | { | |
1546 | if (v >= version_map->size()) | |
1547 | { | |
1548 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1549 | i, v); | |
1550 | continue; | |
1551 | } | |
dbe717ef | 1552 | |
2ea97941 ILT |
1553 | const char* version = (*version_map)[v]; |
1554 | if (version == NULL) | |
aeddab66 ILT |
1555 | { |
1556 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1557 | i, v); | |
1558 | continue; | |
1559 | } | |
dbe717ef | 1560 | |
aeddab66 | 1561 | Stringpool::Key version_key; |
2ea97941 | 1562 | version = this->namepool_.add(version, true, &version_key); |
aeddab66 ILT |
1563 | |
1564 | // If this is an absolute symbol, and the version name | |
1565 | // and symbol name are the same, then this is the | |
1566 | // version definition symbol. These symbols exist to | |
1567 | // support using -u to pull in particular versions. We | |
1568 | // do not want to record a version for them. | |
d491d34e ILT |
1569 | if (st_shndx == elfcpp::SHN_ABS |
1570 | && !is_ordinary | |
aeddab66 | 1571 | && name_key == version_key) |
2ea97941 | 1572 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1573 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1574 | st_shndx); |
aeddab66 ILT |
1575 | else |
1576 | { | |
8781f709 ILT |
1577 | const bool is_default_version = |
1578 | !hidden && st_shndx != elfcpp::SHN_UNDEF; | |
2ea97941 | 1579 | res = this->add_from_object(dynobj, name, name_key, version, |
8781f709 ILT |
1580 | version_key, is_default_version, |
1581 | *psym, st_shndx, | |
d491d34e | 1582 | is_ordinary, st_shndx); |
aeddab66 ILT |
1583 | } |
1584 | } | |
dbe717ef ILT |
1585 | } |
1586 | ||
99a37bfd | 1587 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1588 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1589 | if (st_shndx != elfcpp::SHN_UNDEF |
1590 | && is_ordinary | |
8bdcdf2c | 1591 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1592 | && res->source() == Symbol::FROM_OBJECT |
1593 | && res->object() == dynobj) | |
aeddab66 | 1594 | object_symbols.push_back(res); |
92de84a6 ILT |
1595 | |
1596 | if (sympointers != NULL) | |
1597 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1598 | } |
1599 | ||
1600 | this->record_weak_aliases(&object_symbols); | |
1601 | } | |
1602 | ||
cdc29364 CC |
1603 | // Add a symbol from a incremental object file. |
1604 | ||
1605 | template<int size, bool big_endian> | |
26d3c67d | 1606 | Sized_symbol<size>* |
cdc29364 CC |
1607 | Symbol_table::add_from_incrobj( |
1608 | Object* obj, | |
1609 | const char* name, | |
1610 | const char* ver, | |
1611 | elfcpp::Sym<size, big_endian>* sym) | |
1612 | { | |
1613 | unsigned int st_shndx = sym->get_st_shndx(); | |
1614 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; | |
1615 | ||
1616 | Stringpool::Key ver_key = 0; | |
1617 | bool is_default_version = false; | |
1618 | bool is_forced_local = false; | |
1619 | ||
1620 | Stringpool::Key name_key; | |
1621 | name = this->namepool_.add(name, true, &name_key); | |
1622 | ||
1623 | Sized_symbol<size>* res; | |
1624 | res = this->add_from_object(obj, name, name_key, ver, ver_key, | |
1625 | is_default_version, *sym, st_shndx, | |
1626 | is_ordinary, st_shndx); | |
1627 | ||
1628 | if (is_forced_local) | |
1629 | this->force_local(res); | |
1630 | ||
1631 | return res; | |
1632 | } | |
1633 | ||
aeddab66 ILT |
1634 | // This is used to sort weak aliases. We sort them first by section |
1635 | // index, then by offset, then by weak ahead of strong. | |
1636 | ||
1637 | template<int size> | |
1638 | class Weak_alias_sorter | |
1639 | { | |
1640 | public: | |
1641 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1642 | }; | |
1643 | ||
1644 | template<int size> | |
1645 | bool | |
1646 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1647 | const Sized_symbol<size>* s2) const | |
1648 | { | |
d491d34e ILT |
1649 | bool is_ordinary; |
1650 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1651 | gold_assert(is_ordinary); | |
1652 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1653 | gold_assert(is_ordinary); | |
1654 | if (s1_shndx != s2_shndx) | |
1655 | return s1_shndx < s2_shndx; | |
1656 | ||
aeddab66 ILT |
1657 | if (s1->value() != s2->value()) |
1658 | return s1->value() < s2->value(); | |
1659 | if (s1->binding() != s2->binding()) | |
1660 | { | |
1661 | if (s1->binding() == elfcpp::STB_WEAK) | |
1662 | return true; | |
1663 | if (s2->binding() == elfcpp::STB_WEAK) | |
1664 | return false; | |
1665 | } | |
1666 | return std::string(s1->name()) < std::string(s2->name()); | |
1667 | } | |
dbe717ef | 1668 | |
aeddab66 ILT |
1669 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1670 | // for any weak aliases, and record them so that if we add the weak | |
1671 | // alias to the dynamic symbol table, we also add the corresponding | |
1672 | // strong symbol. | |
dbe717ef | 1673 | |
aeddab66 ILT |
1674 | template<int size> |
1675 | void | |
1676 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1677 | { | |
1678 | // Sort the vector by section index, then by offset, then by weak | |
1679 | // ahead of strong. | |
1680 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1681 | ||
1682 | // Walk through the vector. For each weak definition, record | |
1683 | // aliases. | |
1684 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1685 | symbols->begin(); | |
1686 | p != symbols->end(); | |
1687 | ++p) | |
1688 | { | |
1689 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1690 | continue; | |
1691 | ||
1692 | // Build a circular list of weak aliases. Each symbol points to | |
1693 | // the next one in the circular list. | |
1694 | ||
1695 | Sized_symbol<size>* from_sym = *p; | |
1696 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1697 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1698 | { |
d491d34e ILT |
1699 | bool dummy; |
1700 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1701 | || (*q)->value() != from_sym->value()) |
1702 | break; | |
1703 | ||
1704 | this->weak_aliases_[from_sym] = *q; | |
1705 | from_sym->set_has_alias(); | |
1706 | from_sym = *q; | |
dbe717ef ILT |
1707 | } |
1708 | ||
aeddab66 ILT |
1709 | if (from_sym != *p) |
1710 | { | |
1711 | this->weak_aliases_[from_sym] = *p; | |
1712 | from_sym->set_has_alias(); | |
1713 | } | |
dbe717ef | 1714 | |
aeddab66 | 1715 | p = q - 1; |
dbe717ef ILT |
1716 | } |
1717 | } | |
1718 | ||
ead1e424 ILT |
1719 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1720 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1721 | // If this does not return NULL, it sets *POLDSYM to the existing |
8c500701 ILT |
1722 | // symbol if there is one. This sets *RESOLVE_OLDSYM if we should |
1723 | // resolve the newly created symbol to the old one. This | |
1724 | // canonicalizes *PNAME and *PVERSION. | |
ead1e424 ILT |
1725 | |
1726 | template<int size, bool big_endian> | |
1727 | Sized_symbol<size>* | |
9b07f471 ILT |
1728 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1729 | bool only_if_ref, | |
8c500701 | 1730 | Sized_symbol<size>** poldsym, |
ca09d69a | 1731 | bool* resolve_oldsym) |
ead1e424 | 1732 | { |
8c500701 | 1733 | *resolve_oldsym = false; |
8cc69fb6 | 1734 | *poldsym = NULL; |
ead1e424 | 1735 | |
55a93433 ILT |
1736 | // If the caller didn't give us a version, see if we get one from |
1737 | // the version script. | |
057ead22 | 1738 | std::string v; |
8c500701 | 1739 | bool is_default_version = false; |
55a93433 ILT |
1740 | if (*pversion == NULL) |
1741 | { | |
98e090bd ILT |
1742 | bool is_global; |
1743 | if (this->version_script_.get_symbol_version(*pname, &v, &is_global)) | |
057ead22 | 1744 | { |
98e090bd ILT |
1745 | if (is_global && !v.empty()) |
1746 | { | |
1747 | *pversion = v.c_str(); | |
1748 | // If we get the version from a version script, then we | |
1749 | // are also the default version. | |
1750 | is_default_version = true; | |
1751 | } | |
057ead22 | 1752 | } |
55a93433 ILT |
1753 | } |
1754 | ||
8c500701 ILT |
1755 | Symbol* oldsym; |
1756 | Sized_symbol<size>* sym; | |
1757 | ||
1758 | bool add_to_table = false; | |
1759 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
1760 | bool add_def_to_table = false; | |
1761 | typename Symbol_table_type::iterator add_def_loc = this->table_.end(); | |
1762 | ||
ead1e424 ILT |
1763 | if (only_if_ref) |
1764 | { | |
306d9ef0 | 1765 | oldsym = this->lookup(*pname, *pversion); |
8c500701 ILT |
1766 | if (oldsym == NULL && is_default_version) |
1767 | oldsym = this->lookup(*pname, NULL); | |
f6ce93d6 | 1768 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1769 | return NULL; |
306d9ef0 ILT |
1770 | |
1771 | *pname = oldsym->name(); | |
eebd87a5 ILT |
1772 | if (is_default_version) |
1773 | *pversion = this->namepool_.add(*pversion, true, NULL); | |
1774 | else | |
8c500701 | 1775 | *pversion = oldsym->version(); |
ead1e424 ILT |
1776 | } |
1777 | else | |
1778 | { | |
14b31740 | 1779 | // Canonicalize NAME and VERSION. |
f0641a0b | 1780 | Stringpool::Key name_key; |
cfd73a4e | 1781 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1782 | |
14b31740 | 1783 | Stringpool::Key version_key = 0; |
306d9ef0 | 1784 | if (*pversion != NULL) |
cfd73a4e | 1785 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1786 | |
ead1e424 | 1787 | Symbol* const snull = NULL; |
ead1e424 | 1788 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1789 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1790 | version_key), | |
ead1e424 ILT |
1791 | snull)); |
1792 | ||
8781f709 | 1793 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
8c500701 ILT |
1794 | std::make_pair(this->table_.end(), false); |
1795 | if (is_default_version) | |
1796 | { | |
1797 | const Stringpool::Key vnull = 0; | |
8781f709 ILT |
1798 | insdefault = |
1799 | this->table_.insert(std::make_pair(std::make_pair(name_key, | |
1800 | vnull), | |
1801 | snull)); | |
8c500701 ILT |
1802 | } |
1803 | ||
ead1e424 ILT |
1804 | if (!ins.second) |
1805 | { | |
14b31740 | 1806 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1807 | oldsym = ins.first->second; |
a3ad94ed | 1808 | gold_assert(oldsym != NULL); |
8c500701 ILT |
1809 | |
1810 | if (is_default_version) | |
1811 | { | |
1812 | Sized_symbol<size>* soldsym = | |
1813 | this->get_sized_symbol<size>(oldsym); | |
1814 | this->define_default_version<size, big_endian>(soldsym, | |
8781f709 ILT |
1815 | insdefault.second, |
1816 | insdefault.first); | |
8c500701 | 1817 | } |
ead1e424 ILT |
1818 | } |
1819 | else | |
1820 | { | |
1821 | // We haven't seen this symbol before. | |
a3ad94ed | 1822 | gold_assert(ins.first->second == NULL); |
8c500701 ILT |
1823 | |
1824 | add_to_table = true; | |
1825 | add_loc = ins.first; | |
1826 | ||
8781f709 | 1827 | if (is_default_version && !insdefault.second) |
8c500701 ILT |
1828 | { |
1829 | // We are adding NAME/VERSION, and it is the default | |
1830 | // version. We already have an entry for NAME/NULL. | |
8781f709 | 1831 | oldsym = insdefault.first->second; |
8c500701 ILT |
1832 | *resolve_oldsym = true; |
1833 | } | |
1834 | else | |
1835 | { | |
1836 | oldsym = NULL; | |
1837 | ||
1838 | if (is_default_version) | |
1839 | { | |
1840 | add_def_to_table = true; | |
8781f709 | 1841 | add_def_loc = insdefault.first; |
8c500701 ILT |
1842 | } |
1843 | } | |
ead1e424 ILT |
1844 | } |
1845 | } | |
1846 | ||
8851ecca ILT |
1847 | const Target& target = parameters->target(); |
1848 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1849 | sym = new Sized_symbol<size>(); |
1850 | else | |
ead1e424 | 1851 | { |
029ba973 ILT |
1852 | Sized_target<size, big_endian>* sized_target = |
1853 | parameters->sized_target<size, big_endian>(); | |
86f2e683 ILT |
1854 | sym = sized_target->make_symbol(); |
1855 | if (sym == NULL) | |
1856 | return NULL; | |
1857 | } | |
ead1e424 | 1858 | |
86f2e683 ILT |
1859 | if (add_to_table) |
1860 | add_loc->second = sym; | |
1861 | else | |
1862 | gold_assert(oldsym != NULL); | |
ead1e424 | 1863 | |
8c500701 ILT |
1864 | if (add_def_to_table) |
1865 | add_def_loc->second = sym; | |
1866 | ||
7d1a9ebb | 1867 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1868 | |
1869 | return sym; | |
1870 | } | |
1871 | ||
1872 | // Define a symbol based on an Output_data. | |
1873 | ||
14b31740 | 1874 | Symbol* |
2ea97941 ILT |
1875 | Symbol_table::define_in_output_data(const char* name, |
1876 | const char* version, | |
99fff23b | 1877 | Defined defined, |
9b07f471 | 1878 | Output_data* od, |
2ea97941 ILT |
1879 | uint64_t value, |
1880 | uint64_t symsize, | |
9b07f471 ILT |
1881 | elfcpp::STT type, |
1882 | elfcpp::STB binding, | |
ead1e424 ILT |
1883 | elfcpp::STV visibility, |
1884 | unsigned char nonvis, | |
2ea97941 | 1885 | bool offset_is_from_end, |
ead1e424 ILT |
1886 | bool only_if_ref) |
1887 | { | |
8851ecca | 1888 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1889 | { |
1890 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1891 | return this->do_define_in_output_data<32>(name, version, defined, od, |
2ea97941 | 1892 | value, symsize, type, binding, |
86f2e683 | 1893 | visibility, nonvis, |
2ea97941 | 1894 | offset_is_from_end, |
86f2e683 ILT |
1895 | only_if_ref); |
1896 | #else | |
1897 | gold_unreachable(); | |
1898 | #endif | |
1899 | } | |
8851ecca | 1900 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1901 | { |
1902 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1903 | return this->do_define_in_output_data<64>(name, version, defined, od, |
2ea97941 | 1904 | value, symsize, type, binding, |
86f2e683 | 1905 | visibility, nonvis, |
2ea97941 | 1906 | offset_is_from_end, |
86f2e683 ILT |
1907 | only_if_ref); |
1908 | #else | |
1909 | gold_unreachable(); | |
1910 | #endif | |
1911 | } | |
ead1e424 | 1912 | else |
a3ad94ed | 1913 | gold_unreachable(); |
ead1e424 ILT |
1914 | } |
1915 | ||
1916 | // Define a symbol in an Output_data, sized version. | |
1917 | ||
1918 | template<int size> | |
14b31740 | 1919 | Sized_symbol<size>* |
ead1e424 | 1920 | Symbol_table::do_define_in_output_data( |
2ea97941 ILT |
1921 | const char* name, |
1922 | const char* version, | |
99fff23b | 1923 | Defined defined, |
ead1e424 | 1924 | Output_data* od, |
2ea97941 ILT |
1925 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1926 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1927 | elfcpp::STT type, |
1928 | elfcpp::STB binding, | |
1929 | elfcpp::STV visibility, | |
1930 | unsigned char nonvis, | |
2ea97941 | 1931 | bool offset_is_from_end, |
ead1e424 ILT |
1932 | bool only_if_ref) |
1933 | { | |
1934 | Sized_symbol<size>* sym; | |
86f2e683 | 1935 | Sized_symbol<size>* oldsym; |
8c500701 | 1936 | bool resolve_oldsym; |
ead1e424 | 1937 | |
8851ecca | 1938 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1939 | { |
1940 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1941 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1942 | only_if_ref, &oldsym, |
1943 | &resolve_oldsym); | |
193a53d9 ILT |
1944 | #else |
1945 | gold_unreachable(); | |
1946 | #endif | |
1947 | } | |
ead1e424 | 1948 | else |
193a53d9 ILT |
1949 | { |
1950 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1951 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1952 | only_if_ref, &oldsym, |
1953 | &resolve_oldsym); | |
193a53d9 ILT |
1954 | #else |
1955 | gold_unreachable(); | |
1956 | #endif | |
1957 | } | |
ead1e424 ILT |
1958 | |
1959 | if (sym == NULL) | |
14b31740 | 1960 | return NULL; |
ead1e424 | 1961 | |
2ea97941 | 1962 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
5146f448 CC |
1963 | visibility, nonvis, offset_is_from_end, |
1964 | defined == PREDEFINED); | |
14b31740 | 1965 | |
e5756efb | 1966 | if (oldsym == NULL) |
55a93433 ILT |
1967 | { |
1968 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1969 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1970 | this->force_local(sym); |
2ea97941 | 1971 | else if (version != NULL) |
75517b77 | 1972 | sym->set_is_default(); |
55a93433 ILT |
1973 | return sym; |
1974 | } | |
86f2e683 | 1975 | |
62855347 | 1976 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 1977 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1978 | |
1979 | if (resolve_oldsym) | |
1980 | return sym; | |
1981 | else | |
1982 | { | |
5417c94d CC |
1983 | if (binding == elfcpp::STB_LOCAL |
1984 | || this->version_script_.symbol_is_local(name)) | |
1985 | this->force_local(oldsym); | |
8c500701 ILT |
1986 | delete sym; |
1987 | return oldsym; | |
1988 | } | |
ead1e424 ILT |
1989 | } |
1990 | ||
1991 | // Define a symbol based on an Output_segment. | |
1992 | ||
14b31740 | 1993 | Symbol* |
2ea97941 | 1994 | Symbol_table::define_in_output_segment(const char* name, |
99fff23b ILT |
1995 | const char* version, |
1996 | Defined defined, | |
1997 | Output_segment* os, | |
2ea97941 ILT |
1998 | uint64_t value, |
1999 | uint64_t symsize, | |
9b07f471 ILT |
2000 | elfcpp::STT type, |
2001 | elfcpp::STB binding, | |
ead1e424 ILT |
2002 | elfcpp::STV visibility, |
2003 | unsigned char nonvis, | |
2ea97941 | 2004 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
2005 | bool only_if_ref) |
2006 | { | |
8851ecca | 2007 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
2008 | { |
2009 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 2010 | return this->do_define_in_output_segment<32>(name, version, defined, os, |
2ea97941 | 2011 | value, symsize, type, |
86f2e683 | 2012 | binding, visibility, nonvis, |
2ea97941 | 2013 | offset_base, only_if_ref); |
86f2e683 ILT |
2014 | #else |
2015 | gold_unreachable(); | |
2016 | #endif | |
2017 | } | |
8851ecca | 2018 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
2019 | { |
2020 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 2021 | return this->do_define_in_output_segment<64>(name, version, defined, os, |
2ea97941 | 2022 | value, symsize, type, |
86f2e683 | 2023 | binding, visibility, nonvis, |
2ea97941 | 2024 | offset_base, only_if_ref); |
86f2e683 ILT |
2025 | #else |
2026 | gold_unreachable(); | |
2027 | #endif | |
2028 | } | |
ead1e424 | 2029 | else |
a3ad94ed | 2030 | gold_unreachable(); |
ead1e424 ILT |
2031 | } |
2032 | ||
2033 | // Define a symbol in an Output_segment, sized version. | |
2034 | ||
2035 | template<int size> | |
14b31740 | 2036 | Sized_symbol<size>* |
ead1e424 | 2037 | Symbol_table::do_define_in_output_segment( |
2ea97941 ILT |
2038 | const char* name, |
2039 | const char* version, | |
99fff23b | 2040 | Defined defined, |
ead1e424 | 2041 | Output_segment* os, |
2ea97941 ILT |
2042 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2043 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
2044 | elfcpp::STT type, |
2045 | elfcpp::STB binding, | |
2046 | elfcpp::STV visibility, | |
2047 | unsigned char nonvis, | |
2ea97941 | 2048 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
2049 | bool only_if_ref) |
2050 | { | |
2051 | Sized_symbol<size>* sym; | |
86f2e683 | 2052 | Sized_symbol<size>* oldsym; |
8c500701 | 2053 | bool resolve_oldsym; |
ead1e424 | 2054 | |
8851ecca | 2055 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
2056 | { |
2057 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2058 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2059 | only_if_ref, &oldsym, |
2060 | &resolve_oldsym); | |
9025d29d ILT |
2061 | #else |
2062 | gold_unreachable(); | |
2063 | #endif | |
2064 | } | |
ead1e424 | 2065 | else |
9025d29d ILT |
2066 | { |
2067 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2068 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2069 | only_if_ref, &oldsym, |
2070 | &resolve_oldsym); | |
9025d29d ILT |
2071 | #else |
2072 | gold_unreachable(); | |
2073 | #endif | |
2074 | } | |
ead1e424 ILT |
2075 | |
2076 | if (sym == NULL) | |
14b31740 | 2077 | return NULL; |
ead1e424 | 2078 | |
2ea97941 | 2079 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
5146f448 CC |
2080 | visibility, nonvis, offset_base, |
2081 | defined == PREDEFINED); | |
14b31740 | 2082 | |
e5756efb | 2083 | if (oldsym == NULL) |
55a93433 ILT |
2084 | { |
2085 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 2086 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 2087 | this->force_local(sym); |
2ea97941 | 2088 | else if (version != NULL) |
75517b77 | 2089 | sym->set_is_default(); |
55a93433 ILT |
2090 | return sym; |
2091 | } | |
86f2e683 | 2092 | |
62855347 | 2093 | if (Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 2094 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2095 | |
2096 | if (resolve_oldsym) | |
2097 | return sym; | |
2098 | else | |
2099 | { | |
5417c94d CC |
2100 | if (binding == elfcpp::STB_LOCAL |
2101 | || this->version_script_.symbol_is_local(name)) | |
2102 | this->force_local(oldsym); | |
8c500701 ILT |
2103 | delete sym; |
2104 | return oldsym; | |
2105 | } | |
ead1e424 ILT |
2106 | } |
2107 | ||
2108 | // Define a special symbol with a constant value. It is a multiple | |
2109 | // definition error if this symbol is already defined. | |
2110 | ||
14b31740 | 2111 | Symbol* |
2ea97941 ILT |
2112 | Symbol_table::define_as_constant(const char* name, |
2113 | const char* version, | |
99fff23b | 2114 | Defined defined, |
2ea97941 ILT |
2115 | uint64_t value, |
2116 | uint64_t symsize, | |
9b07f471 ILT |
2117 | elfcpp::STT type, |
2118 | elfcpp::STB binding, | |
2119 | elfcpp::STV visibility, | |
2120 | unsigned char nonvis, | |
caa9d5d9 ILT |
2121 | bool only_if_ref, |
2122 | bool force_override) | |
ead1e424 | 2123 | { |
8851ecca | 2124 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
2125 | { |
2126 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 2127 | return this->do_define_as_constant<32>(name, version, defined, value, |
2ea97941 | 2128 | symsize, type, binding, |
caa9d5d9 ILT |
2129 | visibility, nonvis, only_if_ref, |
2130 | force_override); | |
86f2e683 ILT |
2131 | #else |
2132 | gold_unreachable(); | |
2133 | #endif | |
2134 | } | |
8851ecca | 2135 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
2136 | { |
2137 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 2138 | return this->do_define_as_constant<64>(name, version, defined, value, |
2ea97941 | 2139 | symsize, type, binding, |
caa9d5d9 ILT |
2140 | visibility, nonvis, only_if_ref, |
2141 | force_override); | |
86f2e683 ILT |
2142 | #else |
2143 | gold_unreachable(); | |
2144 | #endif | |
2145 | } | |
ead1e424 | 2146 | else |
a3ad94ed | 2147 | gold_unreachable(); |
ead1e424 ILT |
2148 | } |
2149 | ||
2150 | // Define a symbol as a constant, sized version. | |
2151 | ||
2152 | template<int size> | |
14b31740 | 2153 | Sized_symbol<size>* |
ead1e424 | 2154 | Symbol_table::do_define_as_constant( |
2ea97941 ILT |
2155 | const char* name, |
2156 | const char* version, | |
99fff23b | 2157 | Defined defined, |
2ea97941 ILT |
2158 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2159 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
2160 | elfcpp::STT type, |
2161 | elfcpp::STB binding, | |
2162 | elfcpp::STV visibility, | |
2163 | unsigned char nonvis, | |
caa9d5d9 ILT |
2164 | bool only_if_ref, |
2165 | bool force_override) | |
ead1e424 ILT |
2166 | { |
2167 | Sized_symbol<size>* sym; | |
86f2e683 | 2168 | Sized_symbol<size>* oldsym; |
8c500701 | 2169 | bool resolve_oldsym; |
ead1e424 | 2170 | |
8851ecca | 2171 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
2172 | { |
2173 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2174 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2175 | only_if_ref, &oldsym, |
2176 | &resolve_oldsym); | |
9025d29d ILT |
2177 | #else |
2178 | gold_unreachable(); | |
2179 | #endif | |
2180 | } | |
ead1e424 | 2181 | else |
9025d29d ILT |
2182 | { |
2183 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2184 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2185 | only_if_ref, &oldsym, |
2186 | &resolve_oldsym); | |
9025d29d ILT |
2187 | #else |
2188 | gold_unreachable(); | |
2189 | #endif | |
2190 | } | |
ead1e424 ILT |
2191 | |
2192 | if (sym == NULL) | |
14b31740 | 2193 | return NULL; |
ead1e424 | 2194 | |
2ea97941 | 2195 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
5146f448 | 2196 | nonvis, defined == PREDEFINED); |
14b31740 | 2197 | |
e5756efb | 2198 | if (oldsym == NULL) |
55a93433 | 2199 | { |
686c8caf ILT |
2200 | // Version symbols are absolute symbols with name == version. |
2201 | // We don't want to force them to be local. | |
2ea97941 ILT |
2202 | if ((version == NULL |
2203 | || name != version | |
2204 | || value != 0) | |
686c8caf | 2205 | && (binding == elfcpp::STB_LOCAL |
2ea97941 | 2206 | || this->version_script_.symbol_is_local(name))) |
55a93433 | 2207 | this->force_local(sym); |
2ea97941 ILT |
2208 | else if (version != NULL |
2209 | && (name != version || value != 0)) | |
75517b77 | 2210 | sym->set_is_default(); |
55a93433 ILT |
2211 | return sym; |
2212 | } | |
86f2e683 | 2213 | |
99fff23b | 2214 | if (force_override |
62855347 | 2215 | || Symbol_table::should_override_with_special(oldsym, type, defined)) |
e5756efb | 2216 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2217 | |
2218 | if (resolve_oldsym) | |
2219 | return sym; | |
2220 | else | |
2221 | { | |
5417c94d CC |
2222 | if (binding == elfcpp::STB_LOCAL |
2223 | || this->version_script_.symbol_is_local(name)) | |
2224 | this->force_local(oldsym); | |
8c500701 ILT |
2225 | delete sym; |
2226 | return oldsym; | |
2227 | } | |
ead1e424 ILT |
2228 | } |
2229 | ||
2230 | // Define a set of symbols in output sections. | |
2231 | ||
2232 | void | |
9b07f471 | 2233 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2234 | const Define_symbol_in_section* p, |
2235 | bool only_if_ref) | |
ead1e424 ILT |
2236 | { |
2237 | for (int i = 0; i < count; ++i, ++p) | |
2238 | { | |
2239 | Output_section* os = layout->find_output_section(p->output_section); | |
2240 | if (os != NULL) | |
99fff23b | 2241 | this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2242 | p->size, p->type, p->binding, |
2243 | p->visibility, p->nonvis, | |
a445fddf ILT |
2244 | p->offset_is_from_end, |
2245 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2246 | else |
99fff23b ILT |
2247 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2248 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2249 | only_if_ref || p->only_if_ref, |
2250 | false); | |
ead1e424 ILT |
2251 | } |
2252 | } | |
2253 | ||
2254 | // Define a set of symbols in output segments. | |
2255 | ||
2256 | void | |
9b07f471 | 2257 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2258 | const Define_symbol_in_segment* p, |
2259 | bool only_if_ref) | |
ead1e424 ILT |
2260 | { |
2261 | for (int i = 0; i < count; ++i, ++p) | |
2262 | { | |
2263 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
2264 | p->segment_flags_set, | |
2265 | p->segment_flags_clear); | |
2266 | if (os != NULL) | |
99fff23b | 2267 | this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2268 | p->size, p->type, p->binding, |
2269 | p->visibility, p->nonvis, | |
a445fddf ILT |
2270 | p->offset_base, |
2271 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2272 | else |
99fff23b ILT |
2273 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2274 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2275 | only_if_ref || p->only_if_ref, |
2276 | false); | |
ead1e424 ILT |
2277 | } |
2278 | } | |
2279 | ||
46fe1623 ILT |
2280 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
2281 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
2282 | // the offset within POSD. | |
2283 | ||
2284 | template<int size> | |
2285 | void | |
fe8718a4 | 2286 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
2287 | Sized_symbol<size>* csym, |
2288 | Output_data* posd, | |
2ea97941 | 2289 | typename elfcpp::Elf_types<size>::Elf_Addr value) |
46fe1623 ILT |
2290 | { |
2291 | gold_assert(csym->is_from_dynobj()); | |
2292 | gold_assert(!csym->is_copied_from_dynobj()); | |
2ea97941 ILT |
2293 | Object* object = csym->object(); |
2294 | gold_assert(object->is_dynamic()); | |
2295 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
46fe1623 ILT |
2296 | |
2297 | // Our copied variable has to override any variable in a shared | |
2298 | // library. | |
2299 | elfcpp::STB binding = csym->binding(); | |
2300 | if (binding == elfcpp::STB_WEAK) | |
2301 | binding = elfcpp::STB_GLOBAL; | |
2302 | ||
99fff23b | 2303 | this->define_in_output_data(csym->name(), csym->version(), COPY, |
2ea97941 | 2304 | posd, value, csym->symsize(), |
46fe1623 ILT |
2305 | csym->type(), binding, |
2306 | csym->visibility(), csym->nonvis(), | |
2307 | false, false); | |
2308 | ||
2309 | csym->set_is_copied_from_dynobj(); | |
2310 | csym->set_needs_dynsym_entry(); | |
2311 | ||
2312 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
2313 | ||
2314 | // We have now defined all aliases, but we have not entered them all | |
2315 | // in the copied_symbol_dynobjs_ map. | |
2316 | if (csym->has_alias()) | |
2317 | { | |
2318 | Symbol* sym = csym; | |
2319 | while (true) | |
2320 | { | |
2321 | sym = this->weak_aliases_[sym]; | |
2322 | if (sym == csym) | |
2323 | break; | |
2324 | gold_assert(sym->output_data() == posd); | |
2325 | ||
2326 | sym->set_is_copied_from_dynobj(); | |
2327 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
2328 | } | |
2329 | } | |
2330 | } | |
2331 | ||
2332 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
2333 | // the original definition was found. | |
2334 | ||
2335 | Dynobj* | |
2336 | Symbol_table::get_copy_source(const Symbol* sym) const | |
2337 | { | |
2338 | gold_assert(sym->is_copied_from_dynobj()); | |
2339 | Copied_symbol_dynobjs::const_iterator p = | |
2340 | this->copied_symbol_dynobjs_.find(sym); | |
2341 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
2342 | return p->second; | |
2343 | } | |
2344 | ||
f3e9c5c5 ILT |
2345 | // Add any undefined symbols named on the command line. |
2346 | ||
2347 | void | |
88a4108b | 2348 | Symbol_table::add_undefined_symbols_from_command_line(Layout* layout) |
f3e9c5c5 | 2349 | { |
88a4108b ILT |
2350 | if (parameters->options().any_undefined() |
2351 | || layout->script_options()->any_unreferenced()) | |
f3e9c5c5 ILT |
2352 | { |
2353 | if (parameters->target().get_size() == 32) | |
2354 | { | |
5adf9721 | 2355 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
88a4108b | 2356 | this->do_add_undefined_symbols_from_command_line<32>(layout); |
f3e9c5c5 ILT |
2357 | #else |
2358 | gold_unreachable(); | |
2359 | #endif | |
2360 | } | |
2361 | else if (parameters->target().get_size() == 64) | |
2362 | { | |
2363 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
88a4108b | 2364 | this->do_add_undefined_symbols_from_command_line<64>(layout); |
f3e9c5c5 ILT |
2365 | #else |
2366 | gold_unreachable(); | |
2367 | #endif | |
2368 | } | |
2369 | else | |
2370 | gold_unreachable(); | |
2371 | } | |
2372 | } | |
2373 | ||
2374 | template<int size> | |
2375 | void | |
88a4108b | 2376 | Symbol_table::do_add_undefined_symbols_from_command_line(Layout* layout) |
f3e9c5c5 ILT |
2377 | { |
2378 | for (options::String_set::const_iterator p = | |
2379 | parameters->options().undefined_begin(); | |
2380 | p != parameters->options().undefined_end(); | |
2381 | ++p) | |
88a4108b | 2382 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); |
f3e9c5c5 | 2383 | |
31821be0 CC |
2384 | for (options::String_set::const_iterator p = |
2385 | parameters->options().export_dynamic_symbol_begin(); | |
2386 | p != parameters->options().export_dynamic_symbol_end(); | |
2387 | ++p) | |
2388 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); | |
2389 | ||
88a4108b ILT |
2390 | for (Script_options::referenced_const_iterator p = |
2391 | layout->script_options()->referenced_begin(); | |
2392 | p != layout->script_options()->referenced_end(); | |
2393 | ++p) | |
2394 | this->add_undefined_symbol_from_command_line<size>(p->c_str()); | |
2395 | } | |
2396 | ||
2397 | template<int size> | |
2398 | void | |
2399 | Symbol_table::add_undefined_symbol_from_command_line(const char* name) | |
2400 | { | |
2401 | if (this->lookup(name) != NULL) | |
2402 | return; | |
f3e9c5c5 | 2403 | |
88a4108b | 2404 | const char* version = NULL; |
f3e9c5c5 | 2405 | |
88a4108b ILT |
2406 | Sized_symbol<size>* sym; |
2407 | Sized_symbol<size>* oldsym; | |
2408 | bool resolve_oldsym; | |
2409 | if (parameters->target().is_big_endian()) | |
2410 | { | |
f3e9c5c5 | 2411 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) |
88a4108b ILT |
2412 | sym = this->define_special_symbol<size, true>(&name, &version, |
2413 | false, &oldsym, | |
2414 | &resolve_oldsym); | |
f3e9c5c5 | 2415 | #else |
88a4108b | 2416 | gold_unreachable(); |
f3e9c5c5 | 2417 | #endif |
88a4108b ILT |
2418 | } |
2419 | else | |
2420 | { | |
f3e9c5c5 | 2421 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) |
88a4108b ILT |
2422 | sym = this->define_special_symbol<size, false>(&name, &version, |
2423 | false, &oldsym, | |
2424 | &resolve_oldsym); | |
f3e9c5c5 | 2425 | #else |
88a4108b | 2426 | gold_unreachable(); |
f3e9c5c5 | 2427 | #endif |
88a4108b | 2428 | } |
f3e9c5c5 | 2429 | |
88a4108b | 2430 | gold_assert(oldsym == NULL); |
f3e9c5c5 | 2431 | |
88a4108b ILT |
2432 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
2433 | elfcpp::STV_DEFAULT, 0); | |
2434 | ++this->saw_undefined_; | |
f3e9c5c5 ILT |
2435 | } |
2436 | ||
a3ad94ed ILT |
2437 | // Set the dynamic symbol indexes. INDEX is the index of the first |
2438 | // global dynamic symbol. Pointers to the symbols are stored into the | |
2439 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
2440 | // updated dynamic symbol index. | |
2441 | ||
2442 | unsigned int | |
9b07f471 | 2443 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 2444 | std::vector<Symbol*>* syms, |
14b31740 ILT |
2445 | Stringpool* dynpool, |
2446 | Versions* versions) | |
a3ad94ed | 2447 | { |
32e2b61d AM |
2448 | std::vector<Symbol*> as_needed_sym; |
2449 | ||
98ff9231 CC |
2450 | // Allow a target to set dynsym indexes. |
2451 | if (parameters->target().has_custom_set_dynsym_indexes()) | |
2452 | { | |
2453 | std::vector<Symbol*> dyn_symbols; | |
2454 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
2455 | p != this->table_.end(); | |
2456 | ++p) | |
2457 | { | |
2458 | Symbol* sym = p->second; | |
2459 | if (!sym->should_add_dynsym_entry(this)) | |
2460 | sym->set_dynsym_index(-1U); | |
2461 | else | |
2462 | dyn_symbols.push_back(sym); | |
2463 | } | |
2464 | ||
2465 | return parameters->target().set_dynsym_indexes(&dyn_symbols, index, syms, | |
2466 | dynpool, versions, this); | |
2467 | } | |
2468 | ||
a3ad94ed ILT |
2469 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2470 | p != this->table_.end(); | |
2471 | ++p) | |
2472 | { | |
2473 | Symbol* sym = p->second; | |
16649710 ILT |
2474 | |
2475 | // Note that SYM may already have a dynamic symbol index, since | |
2476 | // some symbols appear more than once in the symbol table, with | |
2477 | // and without a version. | |
2478 | ||
ce97fa81 | 2479 | if (!sym->should_add_dynsym_entry(this)) |
16649710 ILT |
2480 | sym->set_dynsym_index(-1U); |
2481 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
2482 | { |
2483 | sym->set_dynsym_index(index); | |
2484 | ++index; | |
2485 | syms->push_back(sym); | |
cfd73a4e | 2486 | dynpool->add(sym->name(), false, NULL); |
14b31740 | 2487 | |
594c8e5e | 2488 | // If the symbol is defined in a dynamic object and is |
32e2b61d AM |
2489 | // referenced strongly in a regular object, then mark the |
2490 | // dynamic object as needed. This is used to implement | |
2491 | // --as-needed. | |
2492 | if (sym->is_from_dynobj() | |
2493 | && sym->in_reg() | |
2494 | && !sym->is_undef_binding_weak()) | |
594c8e5e | 2495 | sym->object()->set_is_needed(); |
32e2b61d AM |
2496 | |
2497 | // Record any version information, except those from | |
2498 | // as-needed libraries not seen to be needed. Note that the | |
2499 | // is_needed state for such libraries can change in this loop. | |
2500 | if (sym->version() != NULL) | |
2501 | { | |
2502 | if (!sym->is_from_dynobj() | |
2503 | || !sym->object()->as_needed() | |
2504 | || sym->object()->is_needed()) | |
2505 | versions->record_version(this, dynpool, sym); | |
2506 | else | |
2507 | as_needed_sym.push_back(sym); | |
2508 | } | |
a3ad94ed ILT |
2509 | } |
2510 | } | |
2511 | ||
32e2b61d AM |
2512 | // Process version information for symbols from as-needed libraries. |
2513 | for (std::vector<Symbol*>::iterator p = as_needed_sym.begin(); | |
2514 | p != as_needed_sym.end(); | |
2515 | ++p) | |
2516 | { | |
2517 | Symbol* sym = *p; | |
2518 | ||
2519 | if (sym->object()->is_needed()) | |
2520 | versions->record_version(this, dynpool, sym); | |
2521 | else | |
2522 | sym->clear_version(); | |
2523 | } | |
2524 | ||
14b31740 ILT |
2525 | // Finish up the versions. In some cases this may add new dynamic |
2526 | // symbols. | |
9b07f471 | 2527 | index = versions->finalize(this, index, syms); |
14b31740 | 2528 | |
a3ad94ed ILT |
2529 | return index; |
2530 | } | |
2531 | ||
c06b7b0b | 2532 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
2533 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
2534 | // file offset OFF. Add their names to POOL. Return the new file | |
2535 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 2536 | |
75f65a3e | 2537 | off_t |
55a93433 ILT |
2538 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
2539 | size_t dyncount, Stringpool* pool, | |
ca09d69a | 2540 | unsigned int* plocal_symcount) |
54dc6425 | 2541 | { |
f6ce93d6 ILT |
2542 | off_t ret; |
2543 | ||
55a93433 ILT |
2544 | gold_assert(*plocal_symcount != 0); |
2545 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 2546 | |
16649710 ILT |
2547 | this->dynamic_offset_ = dynoff; |
2548 | this->first_dynamic_global_index_ = dyn_global_index; | |
2549 | this->dynamic_count_ = dyncount; | |
2550 | ||
8851ecca | 2551 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
2552 | { |
2553 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 2554 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
2555 | #else |
2556 | gold_unreachable(); | |
2557 | #endif | |
2558 | } | |
8851ecca | 2559 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
2560 | { |
2561 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 2562 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
2563 | #else |
2564 | gold_unreachable(); | |
2565 | #endif | |
2566 | } | |
61ba1cf9 | 2567 | else |
a3ad94ed | 2568 | gold_unreachable(); |
f6ce93d6 ILT |
2569 | |
2570 | // Now that we have the final symbol table, we can reliably note | |
2571 | // which symbols should get warnings. | |
cb295612 | 2572 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2573 | |
2574 | return ret; | |
75f65a3e ILT |
2575 | } |
2576 | ||
55a93433 ILT |
2577 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2578 | // POOL, update *PINDEX and *POFF. | |
2579 | ||
2580 | template<int size> | |
2581 | void | |
2582 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2583 | unsigned int* pindex, off_t* poff) | |
2584 | { | |
2585 | sym->set_symtab_index(*pindex); | |
6d1c4efb ILT |
2586 | if (sym->version() == NULL || !parameters->options().relocatable()) |
2587 | pool->add(sym->name(), false, NULL); | |
2588 | else | |
2589 | pool->add(sym->versioned_name(), true, NULL); | |
55a93433 ILT |
2590 | ++*pindex; |
2591 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2592 | } | |
2593 | ||
ead1e424 ILT |
2594 | // Set the final value for all the symbols. This is called after |
2595 | // Layout::finalize, so all the output sections have their final | |
2596 | // address. | |
75f65a3e ILT |
2597 | |
2598 | template<int size> | |
2599 | off_t | |
55a93433 ILT |
2600 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2601 | unsigned int* plocal_symcount) | |
75f65a3e | 2602 | { |
ead1e424 | 2603 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2604 | this->offset_ = off; |
2605 | ||
55a93433 ILT |
2606 | unsigned int index = *plocal_symcount; |
2607 | const unsigned int orig_index = index; | |
c06b7b0b | 2608 | |
55a93433 ILT |
2609 | // First do all the symbols which have been forced to be local, as |
2610 | // they must appear before all global symbols. | |
2611 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2612 | p != this->forced_locals_.end(); | |
2613 | ++p) | |
2614 | { | |
2615 | Symbol* sym = *p; | |
2616 | gold_assert(sym->is_forced_local()); | |
2617 | if (this->sized_finalize_symbol<size>(sym)) | |
2618 | { | |
2619 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2620 | ++*plocal_symcount; | |
2621 | } | |
2622 | } | |
2623 | ||
2624 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2625 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2626 | p != this->table_.end(); | |
2627 | ++p) | |
54dc6425 | 2628 | { |
55a93433 ILT |
2629 | Symbol* sym = p->second; |
2630 | if (this->sized_finalize_symbol<size>(sym)) | |
2631 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2632 | } | |
54dc6425 | 2633 | |
55a93433 | 2634 | this->output_count_ = index - orig_index; |
a3ad94ed | 2635 | |
55a93433 ILT |
2636 | return off; |
2637 | } | |
75f65a3e | 2638 | |
c0a62865 DK |
2639 | // Compute the final value of SYM and store status in location PSTATUS. |
2640 | // During relaxation, this may be called multiple times for a symbol to | |
2641 | // compute its would-be final value in each relaxation pass. | |
008db82e | 2642 | |
55a93433 | 2643 | template<int size> |
c0a62865 DK |
2644 | typename Sized_symbol<size>::Value_type |
2645 | Symbol_table::compute_final_value( | |
2646 | const Sized_symbol<size>* sym, | |
2647 | Compute_final_value_status* pstatus) const | |
55a93433 | 2648 | { |
ef9beddf | 2649 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2ea97941 | 2650 | Value_type value; |
ead1e424 | 2651 | |
55a93433 ILT |
2652 | switch (sym->source()) |
2653 | { | |
2654 | case Symbol::FROM_OBJECT: | |
2655 | { | |
d491d34e | 2656 | bool is_ordinary; |
2ea97941 | 2657 | unsigned int shndx = sym->shndx(&is_ordinary); |
ead1e424 | 2658 | |
d491d34e | 2659 | if (!is_ordinary |
2ea97941 ILT |
2660 | && shndx != elfcpp::SHN_ABS |
2661 | && !Symbol::is_common_shndx(shndx)) | |
55a93433 | 2662 | { |
c0a62865 DK |
2663 | *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION; |
2664 | return 0; | |
ead1e424 | 2665 | } |
ead1e424 | 2666 | |
55a93433 ILT |
2667 | Object* symobj = sym->object(); |
2668 | if (symobj->is_dynamic()) | |
ead1e424 | 2669 | { |
2ea97941 ILT |
2670 | value = 0; |
2671 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2672 | } |
89fc3421 CC |
2673 | else if (symobj->pluginobj() != NULL) |
2674 | { | |
2ea97941 ILT |
2675 | value = 0; |
2676 | shndx = elfcpp::SHN_UNDEF; | |
89fc3421 | 2677 | } |
2ea97941 ILT |
2678 | else if (shndx == elfcpp::SHN_UNDEF) |
2679 | value = 0; | |
d491d34e | 2680 | else if (!is_ordinary |
2ea97941 ILT |
2681 | && (shndx == elfcpp::SHN_ABS |
2682 | || Symbol::is_common_shndx(shndx))) | |
2683 | value = sym->value(); | |
55a93433 | 2684 | else |
ead1e424 | 2685 | { |
55a93433 | 2686 | Relobj* relobj = static_cast<Relobj*>(symobj); |
2ea97941 | 2687 | Output_section* os = relobj->output_section(shndx); |
55a93433 | 2688 | |
2ea97941 | 2689 | if (this->is_section_folded(relobj, shndx)) |
ef15dade ST |
2690 | { |
2691 | gold_assert(os == NULL); | |
2692 | // Get the os of the section it is folded onto. | |
2693 | Section_id folded = this->icf_->get_folded_section(relobj, | |
2ea97941 | 2694 | shndx); |
ef15dade ST |
2695 | gold_assert(folded.first != NULL); |
2696 | Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first); | |
d6344fb5 DK |
2697 | unsigned folded_shndx = folded.second; |
2698 | ||
2699 | os = folded_obj->output_section(folded_shndx); | |
ef15dade | 2700 | gold_assert(os != NULL); |
d6344fb5 DK |
2701 | |
2702 | // Replace (relobj, shndx) with canonical ICF input section. | |
2703 | shndx = folded_shndx; | |
2704 | relobj = folded_obj; | |
ef15dade ST |
2705 | } |
2706 | ||
d6344fb5 | 2707 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
ef15dade | 2708 | if (os == NULL) |
ead1e424 | 2709 | { |
6d03d481 ST |
2710 | bool static_or_reloc = (parameters->doing_static_link() || |
2711 | parameters->options().relocatable()); | |
2712 | gold_assert(static_or_reloc || sym->dynsym_index() == -1U); | |
2713 | ||
c0a62865 DK |
2714 | *pstatus = CFVS_NO_OUTPUT_SECTION; |
2715 | return 0; | |
ead1e424 | 2716 | } |
55a93433 | 2717 | |
eff45813 CC |
2718 | if (secoff64 == -1ULL) |
2719 | { | |
2720 | // The section needs special handling (e.g., a merge section). | |
ef15dade | 2721 | |
2ea97941 | 2722 | value = os->output_address(relobj, shndx, sym->value()); |
eff45813 CC |
2723 | } |
2724 | else | |
2725 | { | |
2726 | Value_type secoff = | |
2727 | convert_types<Value_type, uint64_t>(secoff64); | |
2728 | if (sym->type() == elfcpp::STT_TLS) | |
2ea97941 | 2729 | value = sym->value() + os->tls_offset() + secoff; |
eff45813 | 2730 | else |
2ea97941 | 2731 | value = sym->value() + os->address() + secoff; |
eff45813 | 2732 | } |
ead1e424 | 2733 | } |
55a93433 ILT |
2734 | } |
2735 | break; | |
2736 | ||
2737 | case Symbol::IN_OUTPUT_DATA: | |
2738 | { | |
2739 | Output_data* od = sym->output_data(); | |
2ea97941 | 2740 | value = sym->value(); |
155a0dd7 | 2741 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2742 | value += od->address(); |
155a0dd7 ILT |
2743 | else |
2744 | { | |
2745 | Output_section* os = od->output_section(); | |
2746 | gold_assert(os != NULL); | |
2ea97941 | 2747 | value += os->tls_offset() + (od->address() - os->address()); |
155a0dd7 | 2748 | } |
55a93433 | 2749 | if (sym->offset_is_from_end()) |
2ea97941 | 2750 | value += od->data_size(); |
55a93433 ILT |
2751 | } |
2752 | break; | |
2753 | ||
2754 | case Symbol::IN_OUTPUT_SEGMENT: | |
2755 | { | |
2756 | Output_segment* os = sym->output_segment(); | |
2ea97941 | 2757 | value = sym->value(); |
edfbb029 | 2758 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2759 | value += os->vaddr(); |
55a93433 ILT |
2760 | switch (sym->offset_base()) |
2761 | { | |
2762 | case Symbol::SEGMENT_START: | |
2763 | break; | |
2764 | case Symbol::SEGMENT_END: | |
2ea97941 | 2765 | value += os->memsz(); |
55a93433 ILT |
2766 | break; |
2767 | case Symbol::SEGMENT_BSS: | |
2ea97941 | 2768 | value += os->filesz(); |
55a93433 ILT |
2769 | break; |
2770 | default: | |
2771 | gold_unreachable(); | |
2772 | } | |
2773 | } | |
2774 | break; | |
ead1e424 | 2775 | |
f3e9c5c5 | 2776 | case Symbol::IS_CONSTANT: |
2ea97941 | 2777 | value = sym->value(); |
55a93433 | 2778 | break; |
ead1e424 | 2779 | |
f3e9c5c5 | 2780 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2781 | value = 0; |
f3e9c5c5 ILT |
2782 | break; |
2783 | ||
55a93433 ILT |
2784 | default: |
2785 | gold_unreachable(); | |
2786 | } | |
ead1e424 | 2787 | |
c0a62865 | 2788 | *pstatus = CFVS_OK; |
2ea97941 | 2789 | return value; |
c0a62865 DK |
2790 | } |
2791 | ||
2792 | // Finalize the symbol SYM. This returns true if the symbol should be | |
2793 | // added to the symbol table, false otherwise. | |
2794 | ||
2795 | template<int size> | |
2796 | bool | |
2797 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2798 | { | |
2799 | typedef typename Sized_symbol<size>::Value_type Value_type; | |
2800 | ||
2801 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
2802 | ||
2803 | // The default version of a symbol may appear twice in the symbol | |
2804 | // table. We only need to finalize it once. | |
2805 | if (sym->has_symtab_index()) | |
2806 | return false; | |
2807 | ||
2808 | if (!sym->in_reg()) | |
2809 | { | |
2810 | gold_assert(!sym->has_symtab_index()); | |
2811 | sym->set_symtab_index(-1U); | |
2812 | gold_assert(sym->dynsym_index() == -1U); | |
2813 | return false; | |
2814 | } | |
2815 | ||
badc8139 RÁE |
2816 | // If the symbol is only present on plugin files, the plugin decided we |
2817 | // don't need it. | |
2818 | if (!sym->in_real_elf()) | |
2819 | { | |
2820 | gold_assert(!sym->has_symtab_index()); | |
2821 | sym->set_symtab_index(-1U); | |
2822 | return false; | |
2823 | } | |
2824 | ||
c0a62865 DK |
2825 | // Compute final symbol value. |
2826 | Compute_final_value_status status; | |
2ea97941 | 2827 | Value_type value = this->compute_final_value(sym, &status); |
c0a62865 DK |
2828 | |
2829 | switch (status) | |
2830 | { | |
2831 | case CFVS_OK: | |
2832 | break; | |
2833 | case CFVS_UNSUPPORTED_SYMBOL_SECTION: | |
2834 | { | |
2835 | bool is_ordinary; | |
2ea97941 | 2836 | unsigned int shndx = sym->shndx(&is_ordinary); |
c0a62865 | 2837 | gold_error(_("%s: unsupported symbol section 0x%x"), |
2ea97941 | 2838 | sym->demangled_name().c_str(), shndx); |
c0a62865 DK |
2839 | } |
2840 | break; | |
2841 | case CFVS_NO_OUTPUT_SECTION: | |
2842 | sym->set_symtab_index(-1U); | |
2843 | return false; | |
2844 | default: | |
2845 | gold_unreachable(); | |
2846 | } | |
2847 | ||
2ea97941 | 2848 | sym->set_value(value); |
9e2dcb77 | 2849 | |
8c604651 CS |
2850 | if (parameters->options().strip_all() |
2851 | || !parameters->options().should_retain_symbol(sym->name())) | |
55a93433 ILT |
2852 | { |
2853 | sym->set_symtab_index(-1U); | |
2854 | return false; | |
54dc6425 | 2855 | } |
75f65a3e | 2856 | |
55a93433 | 2857 | return true; |
54dc6425 ILT |
2858 | } |
2859 | ||
61ba1cf9 ILT |
2860 | // Write out the global symbols. |
2861 | ||
2862 | void | |
fd9d194f | 2863 | Symbol_table::write_globals(const Stringpool* sympool, |
d491d34e ILT |
2864 | const Stringpool* dynpool, |
2865 | Output_symtab_xindex* symtab_xindex, | |
2866 | Output_symtab_xindex* dynsym_xindex, | |
2867 | Output_file* of) const | |
61ba1cf9 | 2868 | { |
8851ecca | 2869 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2870 | { |
9025d29d | 2871 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2872 | case Parameters::TARGET_32_LITTLE: |
fd9d194f | 2873 | this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2874 | dynsym_xindex, of); |
8851ecca | 2875 | break; |
9025d29d | 2876 | #endif |
8851ecca ILT |
2877 | #ifdef HAVE_TARGET_32_BIG |
2878 | case Parameters::TARGET_32_BIG: | |
fd9d194f | 2879 | this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2880 | dynsym_xindex, of); |
8851ecca | 2881 | break; |
9025d29d | 2882 | #endif |
9025d29d | 2883 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2884 | case Parameters::TARGET_64_LITTLE: |
fd9d194f | 2885 | this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2886 | dynsym_xindex, of); |
8851ecca | 2887 | break; |
9025d29d | 2888 | #endif |
8851ecca ILT |
2889 | #ifdef HAVE_TARGET_64_BIG |
2890 | case Parameters::TARGET_64_BIG: | |
fd9d194f | 2891 | this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2892 | dynsym_xindex, of); |
8851ecca ILT |
2893 | break; |
2894 | #endif | |
2895 | default: | |
2896 | gold_unreachable(); | |
61ba1cf9 | 2897 | } |
61ba1cf9 ILT |
2898 | } |
2899 | ||
2900 | // Write out the global symbols. | |
2901 | ||
2902 | template<int size, bool big_endian> | |
2903 | void | |
fd9d194f | 2904 | Symbol_table::sized_write_globals(const Stringpool* sympool, |
16649710 | 2905 | const Stringpool* dynpool, |
d491d34e ILT |
2906 | Output_symtab_xindex* symtab_xindex, |
2907 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2908 | Output_file* of) const |
2909 | { | |
8851ecca | 2910 | const Target& target = parameters->target(); |
9a2d6984 | 2911 | |
61ba1cf9 | 2912 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2913 | |
2914 | const unsigned int output_count = this->output_count_; | |
2915 | const section_size_type oview_size = output_count * sym_size; | |
2916 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2917 | unsigned char* psyms; |
2918 | if (this->offset_ == 0 || output_count == 0) | |
2919 | psyms = NULL; | |
2920 | else | |
2921 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2922 | |
55a93433 ILT |
2923 | const unsigned int dynamic_count = this->dynamic_count_; |
2924 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2925 | const unsigned int first_dynamic_global_index = | |
2926 | this->first_dynamic_global_index_; | |
16649710 | 2927 | unsigned char* dynamic_view; |
5fe2a0f5 | 2928 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2929 | dynamic_view = NULL; |
2930 | else | |
2931 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2932 | |
61ba1cf9 ILT |
2933 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2934 | p != this->table_.end(); | |
2935 | ++p) | |
2936 | { | |
2937 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2938 | ||
9a2d6984 | 2939 | // Possibly warn about unresolved symbols in shared libraries. |
fd9d194f | 2940 | this->warn_about_undefined_dynobj_symbol(sym); |
e2827e5f | 2941 | |
a3ad94ed | 2942 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2943 | unsigned int dynsym_index; |
2944 | if (dynamic_view == NULL) | |
2945 | dynsym_index = -1U; | |
2946 | else | |
2947 | dynsym_index = sym->dynsym_index(); | |
2948 | ||
2949 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2950 | { |
2951 | // This symbol is not included in the output file. | |
2952 | continue; | |
2953 | } | |
16649710 | 2954 | |
2ea97941 | 2955 | unsigned int shndx; |
88dd47ac ILT |
2956 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2957 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ce279a62 | 2958 | elfcpp::STB binding = sym->binding(); |
9634ed06 | 2959 | |
a100d66f ST |
2960 | // If --weak-unresolved-symbols is set, change binding of unresolved |
2961 | // global symbols to STB_WEAK. | |
2962 | if (parameters->options().weak_unresolved_symbols() | |
2963 | && binding == elfcpp::STB_GLOBAL | |
2964 | && sym->is_undefined()) | |
2965 | binding = elfcpp::STB_WEAK; | |
2966 | ||
9634ed06 CC |
2967 | // If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL. |
2968 | if (binding == elfcpp::STB_GNU_UNIQUE | |
2969 | && !parameters->options().gnu_unique()) | |
2970 | binding = elfcpp::STB_GLOBAL; | |
2971 | ||
ead1e424 ILT |
2972 | switch (sym->source()) |
2973 | { | |
2974 | case Symbol::FROM_OBJECT: | |
2975 | { | |
d491d34e ILT |
2976 | bool is_ordinary; |
2977 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2978 | |
d491d34e | 2979 | if (!is_ordinary |
0dfbdef4 | 2980 | && in_shndx != elfcpp::SHN_ABS |
8a5e3e08 | 2981 | && !Symbol::is_common_shndx(in_shndx)) |
ead1e424 | 2982 | { |
75f2446e | 2983 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2984 | sym->demangled_name().c_str(), in_shndx); |
2ea97941 | 2985 | shndx = in_shndx; |
f6ce93d6 | 2986 | } |
ead1e424 ILT |
2987 | else |
2988 | { | |
75f2446e ILT |
2989 | Object* symobj = sym->object(); |
2990 | if (symobj->is_dynamic()) | |
2991 | { | |
2992 | if (sym->needs_dynsym_value()) | |
8851ecca | 2993 | dynsym_value = target.dynsym_value(sym); |
2ea97941 | 2994 | shndx = elfcpp::SHN_UNDEF; |
ce279a62 CC |
2995 | if (sym->is_undef_binding_weak()) |
2996 | binding = elfcpp::STB_WEAK; | |
74f67560 DK |
2997 | else |
2998 | binding = elfcpp::STB_GLOBAL; | |
75f2446e | 2999 | } |
89fc3421 | 3000 | else if (symobj->pluginobj() != NULL) |
2ea97941 | 3001 | shndx = elfcpp::SHN_UNDEF; |
75f2446e | 3002 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
3003 | || (!is_ordinary |
3004 | && (in_shndx == elfcpp::SHN_ABS | |
8a5e3e08 | 3005 | || Symbol::is_common_shndx(in_shndx)))) |
2ea97941 | 3006 | shndx = in_shndx; |
75f2446e ILT |
3007 | else |
3008 | { | |
3009 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 3010 | Output_section* os = relobj->output_section(in_shndx); |
ef15dade ST |
3011 | if (this->is_section_folded(relobj, in_shndx)) |
3012 | { | |
3013 | // This global symbol must be written out even though | |
3014 | // it is folded. | |
3015 | // Get the os of the section it is folded onto. | |
3016 | Section_id folded = | |
3017 | this->icf_->get_folded_section(relobj, in_shndx); | |
3018 | gold_assert(folded.first !=NULL); | |
3019 | Relobj* folded_obj = | |
3020 | reinterpret_cast<Relobj*>(folded.first); | |
3021 | os = folded_obj->output_section(folded.second); | |
3022 | gold_assert(os != NULL); | |
3023 | } | |
75f2446e | 3024 | gold_assert(os != NULL); |
2ea97941 | 3025 | shndx = os->out_shndx(); |
88dd47ac | 3026 | |
2ea97941 | 3027 | if (shndx >= elfcpp::SHN_LORESERVE) |
d491d34e ILT |
3028 | { |
3029 | if (sym_index != -1U) | |
2ea97941 | 3030 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 3031 | if (dynsym_index != -1U) |
2ea97941 ILT |
3032 | dynsym_xindex->add(dynsym_index, shndx); |
3033 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e ILT |
3034 | } |
3035 | ||
88dd47ac ILT |
3036 | // In object files symbol values are section |
3037 | // relative. | |
8851ecca | 3038 | if (parameters->options().relocatable()) |
88dd47ac | 3039 | sym_value -= os->address(); |
75f2446e | 3040 | } |
ead1e424 ILT |
3041 | } |
3042 | } | |
3043 | break; | |
3044 | ||
3045 | case Symbol::IN_OUTPUT_DATA: | |
502e8a84 CC |
3046 | { |
3047 | Output_data* od = sym->output_data(); | |
3048 | ||
3049 | shndx = od->out_shndx(); | |
3050 | if (shndx >= elfcpp::SHN_LORESERVE) | |
3051 | { | |
3052 | if (sym_index != -1U) | |
3053 | symtab_xindex->add(sym_index, shndx); | |
3054 | if (dynsym_index != -1U) | |
3055 | dynsym_xindex->add(dynsym_index, shndx); | |
3056 | shndx = elfcpp::SHN_XINDEX; | |
3057 | } | |
3058 | ||
3059 | // In object files symbol values are section | |
3060 | // relative. | |
3061 | if (parameters->options().relocatable()) | |
3062 | sym_value -= od->address(); | |
3063 | } | |
ead1e424 ILT |
3064 | break; |
3065 | ||
3066 | case Symbol::IN_OUTPUT_SEGMENT: | |
2ea97941 | 3067 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
3068 | break; |
3069 | ||
f3e9c5c5 | 3070 | case Symbol::IS_CONSTANT: |
2ea97941 | 3071 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
3072 | break; |
3073 | ||
f3e9c5c5 | 3074 | case Symbol::IS_UNDEFINED: |
2ea97941 | 3075 | shndx = elfcpp::SHN_UNDEF; |
f3e9c5c5 ILT |
3076 | break; |
3077 | ||
ead1e424 | 3078 | default: |
a3ad94ed | 3079 | gold_unreachable(); |
ead1e424 | 3080 | } |
61ba1cf9 | 3081 | |
16649710 ILT |
3082 | if (sym_index != -1U) |
3083 | { | |
55a93433 ILT |
3084 | sym_index -= first_global_index; |
3085 | gold_assert(sym_index < output_count); | |
3086 | unsigned char* ps = psyms + (sym_index * sym_size); | |
2ea97941 | 3087 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
ce279a62 | 3088 | binding, sympool, ps); |
16649710 | 3089 | } |
61ba1cf9 | 3090 | |
16649710 ILT |
3091 | if (dynsym_index != -1U) |
3092 | { | |
3093 | dynsym_index -= first_dynamic_global_index; | |
3094 | gold_assert(dynsym_index < dynamic_count); | |
3095 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
2ea97941 | 3096 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
ce279a62 | 3097 | binding, dynpool, pd); |
800d9823 CC |
3098 | // Allow a target to adjust dynamic symbol value. |
3099 | parameters->target().adjust_dyn_symbol(sym, pd); | |
16649710 | 3100 | } |
61ba1cf9 ILT |
3101 | } |
3102 | ||
c06b7b0b | 3103 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
3104 | if (dynamic_view != NULL) |
3105 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
3106 | } | |
3107 | ||
3108 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
3109 | // strtab holding the name. | |
3110 | ||
3111 | template<int size, bool big_endian> | |
3112 | void | |
ab5c9e90 ILT |
3113 | Symbol_table::sized_write_symbol( |
3114 | Sized_symbol<size>* sym, | |
2ea97941 ILT |
3115 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
3116 | unsigned int shndx, | |
ce279a62 | 3117 | elfcpp::STB binding, |
ab5c9e90 | 3118 | const Stringpool* pool, |
7d1a9ebb | 3119 | unsigned char* p) const |
16649710 ILT |
3120 | { |
3121 | elfcpp::Sym_write<size, big_endian> osym(p); | |
6d1c4efb ILT |
3122 | if (sym->version() == NULL || !parameters->options().relocatable()) |
3123 | osym.put_st_name(pool->get_offset(sym->name())); | |
3124 | else | |
3125 | osym.put_st_name(pool->get_offset(sym->versioned_name())); | |
2ea97941 | 3126 | osym.put_st_value(value); |
58e54ac2 | 3127 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2ea97941 | 3128 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) |
58e54ac2 CD |
3129 | osym.put_st_size(0); |
3130 | else | |
3131 | osym.put_st_size(sym->symsize()); | |
53d7974c | 3132 | elfcpp::STT type = sym->type(); |
358de988 | 3133 | gold_assert(type != elfcpp::STT_GNU_IFUNC || !sym->is_from_dynobj()); |
55a93433 ILT |
3134 | // A version script may have overridden the default binding. |
3135 | if (sym->is_forced_local()) | |
53d7974c | 3136 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type)); |
55a93433 | 3137 | else |
ce279a62 | 3138 | osym.put_st_info(elfcpp::elf_st_info(binding, type)); |
16649710 | 3139 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2ea97941 | 3140 | osym.put_st_shndx(shndx); |
61ba1cf9 ILT |
3141 | } |
3142 | ||
9a2d6984 ILT |
3143 | // Check for unresolved symbols in shared libraries. This is |
3144 | // controlled by the --allow-shlib-undefined option. | |
3145 | ||
3146 | // We only warn about libraries for which we have seen all the | |
3147 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
3148 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
3149 | // entry, we aren't going to be able to reliably report whether the | |
3150 | // symbol is undefined. | |
3151 | ||
fd9d194f ILT |
3152 | // We also don't warn about libraries found in a system library |
3153 | // directory (e.g., /lib or /usr/lib); we assume that those libraries | |
3154 | // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl | |
3155 | // can have undefined references satisfied by ld-linux.so. | |
9a2d6984 ILT |
3156 | |
3157 | inline void | |
fd9d194f | 3158 | Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const |
9a2d6984 | 3159 | { |
d491d34e | 3160 | bool dummy; |
9a2d6984 ILT |
3161 | if (sym->source() == Symbol::FROM_OBJECT |
3162 | && sym->object()->is_dynamic() | |
d491d34e | 3163 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 3164 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
3165 | && !parameters->options().allow_shlib_undefined() |
3166 | && !parameters->target().is_defined_by_abi(sym) | |
fd9d194f | 3167 | && !sym->object()->is_in_system_directory()) |
9a2d6984 ILT |
3168 | { |
3169 | // A very ugly cast. | |
3170 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
3171 | if (!dynobj->has_unknown_needed_entries()) | |
f073bbf7 | 3172 | gold_undefined_symbol(sym); |
9a2d6984 ILT |
3173 | } |
3174 | } | |
3175 | ||
a3ad94ed ILT |
3176 | // Write out a section symbol. Return the update offset. |
3177 | ||
3178 | void | |
ca09d69a | 3179 | Symbol_table::write_section_symbol(const Output_section* os, |
d491d34e | 3180 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
3181 | Output_file* of, |
3182 | off_t offset) const | |
3183 | { | |
8851ecca | 3184 | switch (parameters->size_and_endianness()) |
a3ad94ed | 3185 | { |
9025d29d | 3186 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 3187 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
3188 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
3189 | offset); | |
8851ecca | 3190 | break; |
9025d29d | 3191 | #endif |
8851ecca ILT |
3192 | #ifdef HAVE_TARGET_32_BIG |
3193 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
3194 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
3195 | offset); | |
8851ecca | 3196 | break; |
9025d29d | 3197 | #endif |
9025d29d | 3198 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 3199 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
3200 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
3201 | offset); | |
8851ecca | 3202 | break; |
9025d29d | 3203 | #endif |
8851ecca ILT |
3204 | #ifdef HAVE_TARGET_64_BIG |
3205 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
3206 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
3207 | offset); | |
8851ecca ILT |
3208 | break; |
3209 | #endif | |
3210 | default: | |
3211 | gold_unreachable(); | |
a3ad94ed | 3212 | } |
a3ad94ed ILT |
3213 | } |
3214 | ||
3215 | // Write out a section symbol, specialized for size and endianness. | |
3216 | ||
3217 | template<int size, bool big_endian> | |
3218 | void | |
3219 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 3220 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
3221 | Output_file* of, |
3222 | off_t offset) const | |
3223 | { | |
3224 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
3225 | ||
3226 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
3227 | ||
3228 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
3229 | osym.put_st_name(0); | |
b4ecf66b ILT |
3230 | if (parameters->options().relocatable()) |
3231 | osym.put_st_value(0); | |
3232 | else | |
3233 | osym.put_st_value(os->address()); | |
a3ad94ed ILT |
3234 | osym.put_st_size(0); |
3235 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
3236 | elfcpp::STT_SECTION)); | |
3237 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e | 3238 | |
2ea97941 ILT |
3239 | unsigned int shndx = os->out_shndx(); |
3240 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e | 3241 | { |
2ea97941 ILT |
3242 | symtab_xindex->add(os->symtab_index(), shndx); |
3243 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 3244 | } |
2ea97941 | 3245 | osym.put_st_shndx(shndx); |
a3ad94ed ILT |
3246 | |
3247 | of->write_output_view(offset, sym_size, pov); | |
3248 | } | |
3249 | ||
abaa3995 ILT |
3250 | // Print statistical information to stderr. This is used for --stats. |
3251 | ||
3252 | void | |
3253 | Symbol_table::print_stats() const | |
3254 | { | |
3255 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
3256 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
3257 | program_name, this->table_.size(), this->table_.bucket_count()); | |
3258 | #else | |
3259 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
3260 | program_name, this->table_.size()); | |
3261 | #endif | |
ad8f37d1 | 3262 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
3263 | } |
3264 | ||
ff541f30 ILT |
3265 | // We check for ODR violations by looking for symbols with the same |
3266 | // name for which the debugging information reports that they were | |
71ff8986 | 3267 | // defined in disjoint source locations. When comparing the source |
55382fb7 ILT |
3268 | // location, we consider instances with the same base filename to be |
3269 | // the same. This is because different object files/shared libraries | |
3270 | // can include the same header file using different paths, and | |
3271 | // different optimization settings can make the line number appear to | |
3272 | // be a couple lines off, and we don't want to report an ODR violation | |
3273 | // in those cases. | |
ff541f30 ILT |
3274 | |
3275 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 3276 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
71ff8986 | 3277 | // operator used with std::sort. |
ff541f30 ILT |
3278 | |
3279 | struct Odr_violation_compare | |
3280 | { | |
3281 | bool | |
3282 | operator()(const std::string& s1, const std::string& s2) const | |
3283 | { | |
55382fb7 | 3284 | // Inputs should be of the form "dirname/filename:linenum" where |
71ff8986 | 3285 | // "dirname/" is optional. We want to compare just the filename:linenum. |
55382fb7 | 3286 | |
71ff8986 | 3287 | // Find the last '/' in each string. |
55382fb7 ILT |
3288 | std::string::size_type s1begin = s1.rfind('/'); |
3289 | std::string::size_type s2begin = s2.rfind('/'); | |
55382fb7 ILT |
3290 | // If there was no '/' in a string, start at the beginning. |
3291 | if (s1begin == std::string::npos) | |
3292 | s1begin = 0; | |
3293 | if (s2begin == std::string::npos) | |
3294 | s2begin = 0; | |
71ff8986 ILT |
3295 | return s1.compare(s1begin, std::string::npos, |
3296 | s2, s2begin, std::string::npos) < 0; | |
ff541f30 ILT |
3297 | } |
3298 | }; | |
3299 | ||
71ff8986 ILT |
3300 | // Returns all of the lines attached to LOC, not just the one the |
3301 | // instruction actually came from. | |
3302 | std::vector<std::string> | |
3303 | Symbol_table::linenos_from_loc(const Task* task, | |
3304 | const Symbol_location& loc) | |
3305 | { | |
3306 | // We need to lock the object in order to read it. This | |
3307 | // means that we have to run in a singleton Task. If we | |
3308 | // want to run this in a general Task for better | |
3309 | // performance, we will need one Task for object, plus | |
3310 | // appropriate locking to ensure that we don't conflict with | |
3311 | // other uses of the object. Also note, one_addr2line is not | |
3312 | // currently thread-safe. | |
3313 | Task_lock_obj<Object> tl(task, loc.object); | |
3314 | ||
3315 | std::vector<std::string> result; | |
dc3714f3 AM |
3316 | Symbol_location code_loc = loc; |
3317 | parameters->target().function_location(&code_loc); | |
71ff8986 ILT |
3318 | // 16 is the size of the object-cache that one_addr2line should use. |
3319 | std::string canonical_result = Dwarf_line_info::one_addr2line( | |
dc3714f3 | 3320 | code_loc.object, code_loc.shndx, code_loc.offset, 16, &result); |
71ff8986 ILT |
3321 | if (!canonical_result.empty()) |
3322 | result.push_back(canonical_result); | |
3323 | return result; | |
3324 | } | |
3325 | ||
3326 | // OutputIterator that records if it was ever assigned to. This | |
3327 | // allows it to be used with std::set_intersection() to check for | |
3328 | // intersection rather than computing the intersection. | |
3329 | struct Check_intersection | |
3330 | { | |
3331 | Check_intersection() | |
3332 | : value_(false) | |
3333 | {} | |
3334 | ||
3335 | bool had_intersection() const | |
3336 | { return this->value_; } | |
3337 | ||
3338 | Check_intersection& operator++() | |
3339 | { return *this; } | |
3340 | ||
3341 | Check_intersection& operator*() | |
3342 | { return *this; } | |
3343 | ||
3344 | template<typename T> | |
3345 | Check_intersection& operator=(const T&) | |
3346 | { | |
3347 | this->value_ = true; | |
3348 | return *this; | |
3349 | } | |
3350 | ||
3351 | private: | |
3352 | bool value_; | |
3353 | }; | |
3354 | ||
70e654ba | 3355 | // Check candidate_odr_violations_ to find symbols with the same name |
71ff8986 ILT |
3356 | // but apparently different definitions (different source-file/line-no |
3357 | // for each line assigned to the first instruction). | |
70e654ba ILT |
3358 | |
3359 | void | |
17a1d0a9 ILT |
3360 | Symbol_table::detect_odr_violations(const Task* task, |
3361 | const char* output_file_name) const | |
70e654ba ILT |
3362 | { |
3363 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
3364 | it != candidate_odr_violations_.end(); | |
3365 | ++it) | |
3366 | { | |
71ff8986 ILT |
3367 | const char* const symbol_name = it->first; |
3368 | ||
3369 | std::string first_object_name; | |
3370 | std::vector<std::string> first_object_linenos; | |
3371 | ||
3372 | Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator | |
3373 | locs = it->second.begin(); | |
3374 | const Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator | |
3375 | locs_end = it->second.end(); | |
3376 | for (; locs != locs_end && first_object_linenos.empty(); ++locs) | |
70e654ba | 3377 | { |
71ff8986 ILT |
3378 | // Save the line numbers from the first definition to |
3379 | // compare to the other definitions. Ideally, we'd compare | |
3380 | // every definition to every other, but we don't want to | |
3381 | // take O(N^2) time to do this. This shortcut may cause | |
3382 | // false negatives that appear or disappear depending on the | |
3383 | // link order, but it won't cause false positives. | |
3384 | first_object_name = locs->object->name(); | |
3385 | first_object_linenos = this->linenos_from_loc(task, *locs); | |
70e654ba | 3386 | } |
437ddf0c CC |
3387 | if (first_object_linenos.empty()) |
3388 | continue; | |
70e654ba | 3389 | |
71ff8986 | 3390 | // Sort by Odr_violation_compare to make std::set_intersection work. |
437ddf0c | 3391 | std::string first_object_canonical_result = first_object_linenos.back(); |
71ff8986 ILT |
3392 | std::sort(first_object_linenos.begin(), first_object_linenos.end(), |
3393 | Odr_violation_compare()); | |
3394 | ||
3395 | for (; locs != locs_end; ++locs) | |
70e654ba | 3396 | { |
71ff8986 ILT |
3397 | std::vector<std::string> linenos = |
3398 | this->linenos_from_loc(task, *locs); | |
3399 | // linenos will be empty if we couldn't parse the debug info. | |
3400 | if (linenos.empty()) | |
3401 | continue; | |
3402 | // Sort by Odr_violation_compare to make std::set_intersection work. | |
437ddf0c CC |
3403 | gold_assert(!linenos.empty()); |
3404 | std::string second_object_canonical_result = linenos.back(); | |
71ff8986 ILT |
3405 | std::sort(linenos.begin(), linenos.end(), Odr_violation_compare()); |
3406 | ||
3407 | Check_intersection intersection_result = | |
3408 | std::set_intersection(first_object_linenos.begin(), | |
3409 | first_object_linenos.end(), | |
3410 | linenos.begin(), | |
3411 | linenos.end(), | |
3412 | Check_intersection(), | |
3413 | Odr_violation_compare()); | |
3414 | if (!intersection_result.had_intersection()) | |
3415 | { | |
3416 | gold_warning(_("while linking %s: symbol '%s' defined in " | |
3417 | "multiple places (possible ODR violation):"), | |
3418 | output_file_name, demangle(symbol_name).c_str()); | |
3419 | // This only prints one location from each definition, | |
3420 | // which may not be the location we expect to intersect | |
3421 | // with another definition. We could print the whole | |
3422 | // set of locations, but that seems too verbose. | |
71ff8986 | 3423 | fprintf(stderr, _(" %s from %s\n"), |
437ddf0c | 3424 | first_object_canonical_result.c_str(), |
71ff8986 ILT |
3425 | first_object_name.c_str()); |
3426 | fprintf(stderr, _(" %s from %s\n"), | |
437ddf0c | 3427 | second_object_canonical_result.c_str(), |
71ff8986 ILT |
3428 | locs->object->name().c_str()); |
3429 | // Only print one broken pair, to avoid needing to | |
3430 | // compare against a list of the disjoint definition | |
3431 | // locations we've found so far. (If we kept comparing | |
3432 | // against just the first one, we'd get a lot of | |
3433 | // redundant complaints about the second definition | |
3434 | // location.) | |
3435 | break; | |
3436 | } | |
70e654ba ILT |
3437 | } |
3438 | } | |
e4e5049b CS |
3439 | // We only call one_addr2line() in this function, so we can clear its cache. |
3440 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
3441 | } |
3442 | ||
f6ce93d6 ILT |
3443 | // Warnings functions. |
3444 | ||
3445 | // Add a new warning. | |
3446 | ||
3447 | void | |
2ea97941 | 3448 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, |
cb295612 | 3449 | const std::string& warning) |
f6ce93d6 | 3450 | { |
2ea97941 ILT |
3451 | name = symtab->canonicalize_name(name); |
3452 | this->warnings_[name].set(obj, warning); | |
f6ce93d6 ILT |
3453 | } |
3454 | ||
3455 | // Look through the warnings and mark the symbols for which we should | |
3456 | // warn. This is called during Layout::finalize when we know the | |
3457 | // sources for all the symbols. | |
3458 | ||
3459 | void | |
cb295612 | 3460 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
3461 | { |
3462 | for (Warning_table::iterator p = this->warnings_.begin(); | |
3463 | p != this->warnings_.end(); | |
3464 | ++p) | |
3465 | { | |
3466 | Symbol* sym = symtab->lookup(p->first, NULL); | |
3467 | if (sym != NULL | |
3468 | && sym->source() == Symbol::FROM_OBJECT | |
3469 | && sym->object() == p->second.object) | |
cb295612 | 3470 | sym->set_has_warning(); |
f6ce93d6 ILT |
3471 | } |
3472 | } | |
3473 | ||
3474 | // Issue a warning. This is called when we see a relocation against a | |
3475 | // symbol for which has a warning. | |
3476 | ||
75f2446e | 3477 | template<int size, bool big_endian> |
f6ce93d6 | 3478 | void |
75f2446e ILT |
3479 | Warnings::issue_warning(const Symbol* sym, |
3480 | const Relocate_info<size, big_endian>* relinfo, | |
3481 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 3482 | { |
a3ad94ed | 3483 | gold_assert(sym->has_warning()); |
9d3b0698 ILT |
3484 | |
3485 | // We don't want to issue a warning for a relocation against the | |
3486 | // symbol in the same object file in which the symbol is defined. | |
3487 | if (sym->object() == relinfo->object) | |
3488 | return; | |
3489 | ||
f6ce93d6 | 3490 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 3491 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
3492 | gold_warning_at_location(relinfo, relnum, reloffset, |
3493 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
3494 | } |
3495 | ||
14bfc3f5 ILT |
3496 | // Instantiate the templates we need. We could use the configure |
3497 | // script to restrict this to only the ones needed for implemented | |
3498 | // targets. | |
3499 | ||
c7912668 ILT |
3500 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3501 | template | |
3502 | void | |
3503 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
3504 | #endif | |
3505 | ||
3506 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3507 | template | |
3508 | void | |
3509 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
3510 | #endif | |
3511 | ||
193a53d9 | 3512 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
3513 | template |
3514 | void | |
193a53d9 | 3515 | Symbol_table::add_from_relobj<32, false>( |
6fa2a40b | 3516 | Sized_relobj_file<32, false>* relobj, |
f6ce93d6 | 3517 | const unsigned char* syms, |
14bfc3f5 | 3518 | size_t count, |
d491d34e | 3519 | size_t symndx_offset, |
14bfc3f5 ILT |
3520 | const char* sym_names, |
3521 | size_t sym_name_size, | |
6fa2a40b | 3522 | Sized_relobj_file<32, false>::Symbols* sympointers, |
92de84a6 | 3523 | size_t* defined); |
193a53d9 | 3524 | #endif |
14bfc3f5 | 3525 | |
193a53d9 | 3526 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
3527 | template |
3528 | void | |
193a53d9 | 3529 | Symbol_table::add_from_relobj<32, true>( |
6fa2a40b | 3530 | Sized_relobj_file<32, true>* relobj, |
f6ce93d6 | 3531 | const unsigned char* syms, |
14bfc3f5 | 3532 | size_t count, |
d491d34e | 3533 | size_t symndx_offset, |
14bfc3f5 ILT |
3534 | const char* sym_names, |
3535 | size_t sym_name_size, | |
6fa2a40b | 3536 | Sized_relobj_file<32, true>::Symbols* sympointers, |
92de84a6 | 3537 | size_t* defined); |
193a53d9 | 3538 | #endif |
14bfc3f5 | 3539 | |
193a53d9 | 3540 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
3541 | template |
3542 | void | |
193a53d9 | 3543 | Symbol_table::add_from_relobj<64, false>( |
6fa2a40b | 3544 | Sized_relobj_file<64, false>* relobj, |
f6ce93d6 | 3545 | const unsigned char* syms, |
14bfc3f5 | 3546 | size_t count, |
d491d34e | 3547 | size_t symndx_offset, |
14bfc3f5 ILT |
3548 | const char* sym_names, |
3549 | size_t sym_name_size, | |
6fa2a40b | 3550 | Sized_relobj_file<64, false>::Symbols* sympointers, |
92de84a6 | 3551 | size_t* defined); |
193a53d9 | 3552 | #endif |
14bfc3f5 | 3553 | |
193a53d9 | 3554 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
3555 | template |
3556 | void | |
193a53d9 | 3557 | Symbol_table::add_from_relobj<64, true>( |
6fa2a40b | 3558 | Sized_relobj_file<64, true>* relobj, |
f6ce93d6 | 3559 | const unsigned char* syms, |
14bfc3f5 | 3560 | size_t count, |
d491d34e | 3561 | size_t symndx_offset, |
14bfc3f5 ILT |
3562 | const char* sym_names, |
3563 | size_t sym_name_size, | |
6fa2a40b | 3564 | Sized_relobj_file<64, true>::Symbols* sympointers, |
92de84a6 | 3565 | size_t* defined); |
193a53d9 | 3566 | #endif |
14bfc3f5 | 3567 | |
89fc3421 CC |
3568 | #ifdef HAVE_TARGET_32_LITTLE |
3569 | template | |
3570 | Symbol* | |
3571 | Symbol_table::add_from_pluginobj<32, false>( | |
3572 | Sized_pluginobj<32, false>* obj, | |
3573 | const char* name, | |
3574 | const char* ver, | |
3575 | elfcpp::Sym<32, false>* sym); | |
3576 | #endif | |
3577 | ||
3578 | #ifdef HAVE_TARGET_32_BIG | |
3579 | template | |
3580 | Symbol* | |
3581 | Symbol_table::add_from_pluginobj<32, true>( | |
3582 | Sized_pluginobj<32, true>* obj, | |
3583 | const char* name, | |
3584 | const char* ver, | |
3585 | elfcpp::Sym<32, true>* sym); | |
3586 | #endif | |
3587 | ||
3588 | #ifdef HAVE_TARGET_64_LITTLE | |
3589 | template | |
3590 | Symbol* | |
3591 | Symbol_table::add_from_pluginobj<64, false>( | |
3592 | Sized_pluginobj<64, false>* obj, | |
3593 | const char* name, | |
3594 | const char* ver, | |
3595 | elfcpp::Sym<64, false>* sym); | |
3596 | #endif | |
3597 | ||
3598 | #ifdef HAVE_TARGET_64_BIG | |
3599 | template | |
3600 | Symbol* | |
3601 | Symbol_table::add_from_pluginobj<64, true>( | |
3602 | Sized_pluginobj<64, true>* obj, | |
3603 | const char* name, | |
3604 | const char* ver, | |
3605 | elfcpp::Sym<64, true>* sym); | |
3606 | #endif | |
3607 | ||
193a53d9 | 3608 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
3609 | template |
3610 | void | |
193a53d9 ILT |
3611 | Symbol_table::add_from_dynobj<32, false>( |
3612 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
3613 | const unsigned char* syms, |
3614 | size_t count, | |
3615 | const char* sym_names, | |
3616 | size_t sym_name_size, | |
3617 | const unsigned char* versym, | |
3618 | size_t versym_size, | |
92de84a6 | 3619 | const std::vector<const char*>* version_map, |
6fa2a40b | 3620 | Sized_relobj_file<32, false>::Symbols* sympointers, |
92de84a6 | 3621 | size_t* defined); |
193a53d9 | 3622 | #endif |
dbe717ef | 3623 | |
193a53d9 | 3624 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
3625 | template |
3626 | void | |
193a53d9 ILT |
3627 | Symbol_table::add_from_dynobj<32, true>( |
3628 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
3629 | const unsigned char* syms, |
3630 | size_t count, | |
3631 | const char* sym_names, | |
3632 | size_t sym_name_size, | |
3633 | const unsigned char* versym, | |
3634 | size_t versym_size, | |
92de84a6 | 3635 | const std::vector<const char*>* version_map, |
6fa2a40b | 3636 | Sized_relobj_file<32, true>::Symbols* sympointers, |
92de84a6 | 3637 | size_t* defined); |
193a53d9 | 3638 | #endif |
dbe717ef | 3639 | |
193a53d9 | 3640 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
3641 | template |
3642 | void | |
193a53d9 ILT |
3643 | Symbol_table::add_from_dynobj<64, false>( |
3644 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
3645 | const unsigned char* syms, |
3646 | size_t count, | |
3647 | const char* sym_names, | |
3648 | size_t sym_name_size, | |
3649 | const unsigned char* versym, | |
3650 | size_t versym_size, | |
92de84a6 | 3651 | const std::vector<const char*>* version_map, |
6fa2a40b | 3652 | Sized_relobj_file<64, false>::Symbols* sympointers, |
92de84a6 | 3653 | size_t* defined); |
193a53d9 | 3654 | #endif |
dbe717ef | 3655 | |
193a53d9 | 3656 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
3657 | template |
3658 | void | |
193a53d9 ILT |
3659 | Symbol_table::add_from_dynobj<64, true>( |
3660 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
3661 | const unsigned char* syms, |
3662 | size_t count, | |
3663 | const char* sym_names, | |
3664 | size_t sym_name_size, | |
3665 | const unsigned char* versym, | |
3666 | size_t versym_size, | |
92de84a6 | 3667 | const std::vector<const char*>* version_map, |
6fa2a40b | 3668 | Sized_relobj_file<64, true>::Symbols* sympointers, |
92de84a6 | 3669 | size_t* defined); |
193a53d9 | 3670 | #endif |
dbe717ef | 3671 | |
cdc29364 CC |
3672 | #ifdef HAVE_TARGET_32_LITTLE |
3673 | template | |
26d3c67d | 3674 | Sized_symbol<32>* |
cdc29364 CC |
3675 | Symbol_table::add_from_incrobj( |
3676 | Object* obj, | |
3677 | const char* name, | |
3678 | const char* ver, | |
3679 | elfcpp::Sym<32, false>* sym); | |
3680 | #endif | |
3681 | ||
3682 | #ifdef HAVE_TARGET_32_BIG | |
3683 | template | |
26d3c67d | 3684 | Sized_symbol<32>* |
cdc29364 CC |
3685 | Symbol_table::add_from_incrobj( |
3686 | Object* obj, | |
3687 | const char* name, | |
3688 | const char* ver, | |
3689 | elfcpp::Sym<32, true>* sym); | |
3690 | #endif | |
3691 | ||
3692 | #ifdef HAVE_TARGET_64_LITTLE | |
3693 | template | |
26d3c67d | 3694 | Sized_symbol<64>* |
cdc29364 CC |
3695 | Symbol_table::add_from_incrobj( |
3696 | Object* obj, | |
3697 | const char* name, | |
3698 | const char* ver, | |
3699 | elfcpp::Sym<64, false>* sym); | |
3700 | #endif | |
3701 | ||
3702 | #ifdef HAVE_TARGET_64_BIG | |
3703 | template | |
26d3c67d | 3704 | Sized_symbol<64>* |
cdc29364 CC |
3705 | Symbol_table::add_from_incrobj( |
3706 | Object* obj, | |
3707 | const char* name, | |
3708 | const char* ver, | |
3709 | elfcpp::Sym<64, true>* sym); | |
3710 | #endif | |
3711 | ||
46fe1623 ILT |
3712 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3713 | template | |
3714 | void | |
fe8718a4 | 3715 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
3716 | Sized_symbol<32>* sym, |
3717 | Output_data* posd, | |
2ea97941 | 3718 | elfcpp::Elf_types<32>::Elf_Addr value); |
46fe1623 ILT |
3719 | #endif |
3720 | ||
3721 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3722 | template | |
3723 | void | |
fe8718a4 | 3724 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
3725 | Sized_symbol<64>* sym, |
3726 | Output_data* posd, | |
2ea97941 | 3727 | elfcpp::Elf_types<64>::Elf_Addr value); |
46fe1623 ILT |
3728 | #endif |
3729 | ||
beacaa96 CC |
3730 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3731 | template | |
3732 | void | |
3733 | Sized_symbol<32>::init_output_data(const char* name, const char* version, | |
3734 | Output_data* od, Value_type value, | |
3735 | Size_type symsize, elfcpp::STT type, | |
3736 | elfcpp::STB binding, | |
3737 | elfcpp::STV visibility, | |
3738 | unsigned char nonvis, | |
3739 | bool offset_is_from_end, | |
3740 | bool is_predefined); | |
3741 | #endif | |
3742 | ||
3743 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3744 | template | |
3745 | void | |
3746 | Sized_symbol<64>::init_output_data(const char* name, const char* version, | |
3747 | Output_data* od, Value_type value, | |
3748 | Size_type symsize, elfcpp::STT type, | |
3749 | elfcpp::STB binding, | |
3750 | elfcpp::STV visibility, | |
3751 | unsigned char nonvis, | |
3752 | bool offset_is_from_end, | |
3753 | bool is_predefined); | |
3754 | #endif | |
3755 | ||
75f2446e ILT |
3756 | #ifdef HAVE_TARGET_32_LITTLE |
3757 | template | |
3758 | void | |
3759 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
3760 | const Relocate_info<32, false>* relinfo, | |
3761 | size_t relnum, off_t reloffset) const; | |
3762 | #endif | |
3763 | ||
3764 | #ifdef HAVE_TARGET_32_BIG | |
3765 | template | |
3766 | void | |
3767 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
3768 | const Relocate_info<32, true>* relinfo, | |
3769 | size_t relnum, off_t reloffset) const; | |
3770 | #endif | |
3771 | ||
3772 | #ifdef HAVE_TARGET_64_LITTLE | |
3773 | template | |
3774 | void | |
3775 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
3776 | const Relocate_info<64, false>* relinfo, | |
3777 | size_t relnum, off_t reloffset) const; | |
3778 | #endif | |
3779 | ||
3780 | #ifdef HAVE_TARGET_64_BIG | |
3781 | template | |
3782 | void | |
3783 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
3784 | const Relocate_info<64, true>* relinfo, | |
3785 | size_t relnum, off_t reloffset) const; | |
3786 | #endif | |
3787 | ||
14bfc3f5 | 3788 | } // End namespace gold. |