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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
8781f709 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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" |
c82fbeee | 41 | #include "demangle.h" // needed for --dynamic-list-cpp-new |
89fc3421 | 42 | #include "plugin.h" |
14bfc3f5 ILT |
43 | |
44 | namespace gold | |
45 | { | |
46 | ||
47 | // Class Symbol. | |
48 | ||
ead1e424 ILT |
49 | // Initialize fields in Symbol. This initializes everything except u_ |
50 | // and source_. | |
14bfc3f5 | 51 | |
14bfc3f5 | 52 | void |
2ea97941 ILT |
53 | Symbol::init_fields(const char* name, const char* version, |
54 | elfcpp::STT type, elfcpp::STB binding, | |
55 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 | 56 | { |
2ea97941 ILT |
57 | this->name_ = name; |
58 | this->version_ = version; | |
c06b7b0b ILT |
59 | this->symtab_index_ = 0; |
60 | this->dynsym_index_ = 0; | |
0a65a3a7 | 61 | this->got_offsets_.init(); |
880cd20d | 62 | this->plt_offset_ = -1U; |
2ea97941 ILT |
63 | this->type_ = type; |
64 | this->binding_ = binding; | |
65 | this->visibility_ = visibility; | |
66 | this->nonvis_ = nonvis; | |
1564db8d ILT |
67 | this->is_def_ = false; |
68 | this->is_forwarder_ = false; | |
aeddab66 | 69 | this->has_alias_ = false; |
c06b7b0b | 70 | this->needs_dynsym_entry_ = false; |
008db82e | 71 | this->in_reg_ = false; |
ead1e424 | 72 | this->in_dyn_ = false; |
f6ce93d6 | 73 | this->has_warning_ = false; |
46fe1623 | 74 | this->is_copied_from_dynobj_ = false; |
55a93433 | 75 | this->is_forced_local_ = false; |
d491d34e | 76 | this->is_ordinary_shndx_ = false; |
89fc3421 | 77 | this->in_real_elf_ = false; |
880cd20d | 78 | this->is_defined_in_discarded_section_ = false; |
ead1e424 ILT |
79 | } |
80 | ||
a2b1aa12 ILT |
81 | // Return the demangled version of the symbol's name, but only |
82 | // if the --demangle flag was set. | |
83 | ||
84 | static std::string | |
2ea97941 | 85 | demangle(const char* name) |
a2b1aa12 | 86 | { |
086a1841 | 87 | if (!parameters->options().do_demangle()) |
2ea97941 | 88 | return name; |
ff541f30 | 89 | |
a2b1aa12 ILT |
90 | // cplus_demangle allocates memory for the result it returns, |
91 | // and returns NULL if the name is already demangled. | |
2ea97941 | 92 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); |
a2b1aa12 | 93 | if (demangled_name == NULL) |
2ea97941 | 94 | return name; |
a2b1aa12 ILT |
95 | |
96 | std::string retval(demangled_name); | |
97 | free(demangled_name); | |
98 | return retval; | |
99 | } | |
100 | ||
101 | std::string | |
102 | Symbol::demangled_name() const | |
103 | { | |
ff541f30 | 104 | return demangle(this->name()); |
a2b1aa12 ILT |
105 | } |
106 | ||
ead1e424 ILT |
107 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
108 | ||
109 | template<int size, bool big_endian> | |
110 | void | |
2ea97941 | 111 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
f3e9c5c5 ILT |
112 | const elfcpp::Sym<size, big_endian>& sym, |
113 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 | 114 | { |
2ea97941 | 115 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), |
ead1e424 | 116 | sym.get_st_visibility(), sym.get_st_nonvis()); |
2ea97941 | 117 | this->u_.from_object.object = object; |
d491d34e ILT |
118 | this->u_.from_object.shndx = st_shndx; |
119 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 120 | this->source_ = FROM_OBJECT; |
2ea97941 ILT |
121 | this->in_reg_ = !object->is_dynamic(); |
122 | this->in_dyn_ = object->is_dynamic(); | |
123 | this->in_real_elf_ = object->pluginobj() == NULL; | |
14bfc3f5 ILT |
124 | } |
125 | ||
ead1e424 ILT |
126 | // Initialize the fields in the base class Symbol for a symbol defined |
127 | // in an Output_data. | |
128 | ||
129 | void | |
2ea97941 ILT |
130 | Symbol::init_base_output_data(const char* name, const char* version, |
131 | Output_data* od, elfcpp::STT type, | |
132 | elfcpp::STB binding, elfcpp::STV visibility, | |
133 | unsigned char nonvis, bool offset_is_from_end) | |
ead1e424 | 134 | { |
2ea97941 | 135 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 136 | this->u_.in_output_data.output_data = od; |
2ea97941 | 137 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; |
ead1e424 | 138 | this->source_ = IN_OUTPUT_DATA; |
008db82e | 139 | this->in_reg_ = true; |
89fc3421 | 140 | this->in_real_elf_ = true; |
ead1e424 ILT |
141 | } |
142 | ||
143 | // Initialize the fields in the base class Symbol for a symbol defined | |
144 | // in an Output_segment. | |
145 | ||
146 | void | |
2ea97941 ILT |
147 | Symbol::init_base_output_segment(const char* name, const char* version, |
148 | Output_segment* os, elfcpp::STT type, | |
149 | elfcpp::STB binding, elfcpp::STV visibility, | |
150 | unsigned char nonvis, | |
151 | Segment_offset_base offset_base) | |
ead1e424 | 152 | { |
2ea97941 | 153 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 154 | this->u_.in_output_segment.output_segment = os; |
2ea97941 | 155 | this->u_.in_output_segment.offset_base = offset_base; |
ead1e424 | 156 | this->source_ = IN_OUTPUT_SEGMENT; |
008db82e | 157 | this->in_reg_ = true; |
89fc3421 | 158 | this->in_real_elf_ = true; |
ead1e424 ILT |
159 | } |
160 | ||
161 | // Initialize the fields in the base class Symbol for a symbol defined | |
162 | // as a constant. | |
163 | ||
164 | void | |
2ea97941 ILT |
165 | Symbol::init_base_constant(const char* name, const char* version, |
166 | elfcpp::STT type, elfcpp::STB binding, | |
167 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 168 | { |
2ea97941 | 169 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
170 | this->source_ = IS_CONSTANT; |
171 | this->in_reg_ = true; | |
89fc3421 | 172 | this->in_real_elf_ = true; |
f3e9c5c5 ILT |
173 | } |
174 | ||
175 | // Initialize the fields in the base class Symbol for an undefined | |
176 | // symbol. | |
177 | ||
178 | void | |
2ea97941 ILT |
179 | Symbol::init_base_undefined(const char* name, const char* version, |
180 | elfcpp::STT type, elfcpp::STB binding, | |
181 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 182 | { |
2ea97941 | 183 | this->init_fields(name, version, type, binding, visibility, nonvis); |
d7ab2a47 | 184 | this->dynsym_index_ = -1U; |
f3e9c5c5 | 185 | this->source_ = IS_UNDEFINED; |
008db82e | 186 | this->in_reg_ = true; |
89fc3421 | 187 | this->in_real_elf_ = true; |
ead1e424 ILT |
188 | } |
189 | ||
c7912668 ILT |
190 | // Allocate a common symbol in the base. |
191 | ||
192 | void | |
193 | Symbol::allocate_base_common(Output_data* od) | |
194 | { | |
195 | gold_assert(this->is_common()); | |
196 | this->source_ = IN_OUTPUT_DATA; | |
197 | this->u_.in_output_data.output_data = od; | |
198 | this->u_.in_output_data.offset_is_from_end = false; | |
199 | } | |
200 | ||
ead1e424 | 201 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
202 | |
203 | template<int size> | |
204 | template<bool big_endian> | |
205 | void | |
2ea97941 ILT |
206 | Sized_symbol<size>::init_object(const char* name, const char* version, |
207 | Object* object, | |
f3e9c5c5 ILT |
208 | const elfcpp::Sym<size, big_endian>& sym, |
209 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 210 | { |
2ea97941 | 211 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 212 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
213 | this->symsize_ = sym.get_st_size(); |
214 | } | |
215 | ||
216 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
217 | // Output_data. | |
218 | ||
219 | template<int size> | |
220 | void | |
2ea97941 ILT |
221 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
222 | Output_data* od, Value_type value, | |
223 | Size_type symsize, elfcpp::STT type, | |
224 | elfcpp::STB binding, | |
225 | elfcpp::STV visibility, | |
226 | unsigned char nonvis, | |
227 | bool offset_is_from_end) | |
ead1e424 | 228 | { |
2ea97941 ILT |
229 | this->init_base_output_data(name, version, od, type, binding, visibility, |
230 | nonvis, offset_is_from_end); | |
231 | this->value_ = value; | |
232 | this->symsize_ = symsize; | |
ead1e424 ILT |
233 | } |
234 | ||
235 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
236 | // Output_segment. | |
237 | ||
238 | template<int size> | |
239 | void | |
2ea97941 ILT |
240 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
241 | Output_segment* os, Value_type value, | |
242 | Size_type symsize, elfcpp::STT type, | |
243 | elfcpp::STB binding, | |
244 | elfcpp::STV visibility, | |
245 | unsigned char nonvis, | |
246 | Segment_offset_base offset_base) | |
ead1e424 | 247 | { |
2ea97941 ILT |
248 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
249 | nonvis, offset_base); | |
250 | this->value_ = value; | |
251 | this->symsize_ = symsize; | |
ead1e424 ILT |
252 | } |
253 | ||
254 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
255 | // constant. | |
256 | ||
257 | template<int size> | |
258 | void | |
2ea97941 ILT |
259 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
260 | Value_type value, Size_type symsize, | |
261 | elfcpp::STT type, elfcpp::STB binding, | |
262 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 263 | { |
2ea97941 ILT |
264 | this->init_base_constant(name, version, type, binding, visibility, nonvis); |
265 | this->value_ = value; | |
266 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
267 | } |
268 | ||
f3e9c5c5 ILT |
269 | // Initialize the fields in Sized_symbol for an undefined symbol. |
270 | ||
271 | template<int size> | |
272 | void | |
2ea97941 ILT |
273 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
274 | elfcpp::STT type, elfcpp::STB binding, | |
275 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 276 | { |
2ea97941 | 277 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
278 | this->value_ = 0; |
279 | this->symsize_ = 0; | |
280 | } | |
281 | ||
8a5e3e08 ILT |
282 | // Return true if SHNDX represents a common symbol. |
283 | ||
284 | bool | |
2ea97941 | 285 | Symbol::is_common_shndx(unsigned int shndx) |
8a5e3e08 | 286 | { |
2ea97941 ILT |
287 | return (shndx == elfcpp::SHN_COMMON |
288 | || shndx == parameters->target().small_common_shndx() | |
289 | || shndx == parameters->target().large_common_shndx()); | |
8a5e3e08 ILT |
290 | } |
291 | ||
c7912668 ILT |
292 | // Allocate a common symbol. |
293 | ||
294 | template<int size> | |
295 | void | |
2ea97941 | 296 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) |
c7912668 ILT |
297 | { |
298 | this->allocate_base_common(od); | |
2ea97941 | 299 | this->value_ = value; |
c7912668 ILT |
300 | } |
301 | ||
c82fbeee CS |
302 | // The ""'s around str ensure str is a string literal, so sizeof works. |
303 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) | |
304 | ||
436ca963 ILT |
305 | // Return true if this symbol should be added to the dynamic symbol |
306 | // table. | |
307 | ||
308 | inline bool | |
ce97fa81 | 309 | Symbol::should_add_dynsym_entry(Symbol_table* symtab) const |
436ca963 ILT |
310 | { |
311 | // If the symbol is used by a dynamic relocation, we need to add it. | |
312 | if (this->needs_dynsym_entry()) | |
313 | return true; | |
314 | ||
6d03d481 ST |
315 | // If this symbol's section is not added, the symbol need not be added. |
316 | // The section may have been GCed. Note that export_dynamic is being | |
317 | // overridden here. This should not be done for shared objects. | |
318 | if (parameters->options().gc_sections() | |
319 | && !parameters->options().shared() | |
320 | && this->source() == Symbol::FROM_OBJECT | |
321 | && !this->object()->is_dynamic()) | |
322 | { | |
323 | Relobj* relobj = static_cast<Relobj*>(this->object()); | |
324 | bool is_ordinary; | |
2ea97941 ILT |
325 | unsigned int shndx = this->shndx(&is_ordinary); |
326 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF | |
ce97fa81 ST |
327 | && !relobj->is_section_included(shndx) |
328 | && !symtab->is_section_folded(relobj, shndx)) | |
6d03d481 ST |
329 | return false; |
330 | } | |
331 | ||
55a93433 ILT |
332 | // If the symbol was forced local in a version script, do not add it. |
333 | if (this->is_forced_local()) | |
334 | return false; | |
335 | ||
c82fbeee CS |
336 | // If the symbol was forced dynamic in a --dynamic-list file, add it. |
337 | if (parameters->options().in_dynamic_list(this->name())) | |
338 | return true; | |
339 | ||
340 | // If dynamic-list-data was specified, add any STT_OBJECT. | |
341 | if (parameters->options().dynamic_list_data() | |
342 | && !this->is_from_dynobj() | |
343 | && this->type() == elfcpp::STT_OBJECT) | |
344 | return true; | |
345 | ||
346 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. | |
347 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. | |
348 | if ((parameters->options().dynamic_list_cpp_new() | |
349 | || parameters->options().dynamic_list_cpp_typeinfo()) | |
350 | && !this->is_from_dynobj()) | |
351 | { | |
352 | // TODO(csilvers): We could probably figure out if we're an operator | |
353 | // new/delete or typeinfo without the need to demangle. | |
2ea97941 ILT |
354 | char* demangled_name = cplus_demangle(this->name(), |
355 | DMGL_ANSI | DMGL_PARAMS); | |
356 | if (demangled_name == NULL) | |
c82fbeee CS |
357 | { |
358 | // Not a C++ symbol, so it can't satisfy these flags | |
359 | } | |
360 | else if (parameters->options().dynamic_list_cpp_new() | |
2ea97941 ILT |
361 | && (strprefix(demangled_name, "operator new") |
362 | || strprefix(demangled_name, "operator delete"))) | |
c82fbeee | 363 | { |
2ea97941 | 364 | free(demangled_name); |
c82fbeee CS |
365 | return true; |
366 | } | |
367 | else if (parameters->options().dynamic_list_cpp_typeinfo() | |
2ea97941 ILT |
368 | && (strprefix(demangled_name, "typeinfo name for") |
369 | || strprefix(demangled_name, "typeinfo for"))) | |
c82fbeee | 370 | { |
2ea97941 | 371 | free(demangled_name); |
c82fbeee CS |
372 | return true; |
373 | } | |
374 | else | |
2ea97941 | 375 | free(demangled_name); |
c82fbeee CS |
376 | } |
377 | ||
436ca963 ILT |
378 | // If exporting all symbols or building a shared library, |
379 | // and the symbol is defined in a regular object and is | |
380 | // externally visible, we need to add it. | |
8851ecca | 381 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
382 | && !this->is_from_dynobj() |
383 | && this->is_externally_visible()) | |
384 | return true; | |
385 | ||
386 | return false; | |
387 | } | |
388 | ||
b3b74ddc ILT |
389 | // Return true if the final value of this symbol is known at link |
390 | // time. | |
391 | ||
392 | bool | |
393 | Symbol::final_value_is_known() const | |
394 | { | |
395 | // If we are not generating an executable, then no final values are | |
396 | // known, since they will change at runtime. | |
374ad285 ILT |
397 | if (parameters->options().output_is_position_independent() |
398 | || parameters->options().relocatable()) | |
b3b74ddc ILT |
399 | return false; |
400 | ||
f3e9c5c5 ILT |
401 | // If the symbol is not from an object file, and is not undefined, |
402 | // then it is defined, and known. | |
b3b74ddc | 403 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
404 | { |
405 | if (this->source_ != IS_UNDEFINED) | |
406 | return true; | |
407 | } | |
408 | else | |
409 | { | |
410 | // If the symbol is from a dynamic object, then the final value | |
411 | // is not known. | |
412 | if (this->object()->is_dynamic()) | |
413 | return false; | |
b3b74ddc | 414 | |
f3e9c5c5 ILT |
415 | // If the symbol is not undefined (it is defined or common), |
416 | // then the final value is known. | |
417 | if (!this->is_undefined()) | |
418 | return true; | |
419 | } | |
b3b74ddc ILT |
420 | |
421 | // If the symbol is undefined, then whether the final value is known | |
422 | // depends on whether we are doing a static link. If we are doing a | |
423 | // dynamic link, then the final value could be filled in at runtime. | |
424 | // This could reasonably be the case for a weak undefined symbol. | |
425 | return parameters->doing_static_link(); | |
426 | } | |
427 | ||
77e65537 | 428 | // Return the output section where this symbol is defined. |
a445fddf | 429 | |
77e65537 ILT |
430 | Output_section* |
431 | Symbol::output_section() const | |
a445fddf ILT |
432 | { |
433 | switch (this->source_) | |
434 | { | |
435 | case FROM_OBJECT: | |
77e65537 | 436 | { |
2ea97941 ILT |
437 | unsigned int shndx = this->u_.from_object.shndx; |
438 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) | |
77e65537 ILT |
439 | { |
440 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 441 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 442 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
2ea97941 | 443 | return relobj->output_section(shndx); |
77e65537 ILT |
444 | } |
445 | return NULL; | |
446 | } | |
447 | ||
a445fddf | 448 | case IN_OUTPUT_DATA: |
77e65537 ILT |
449 | return this->u_.in_output_data.output_data->output_section(); |
450 | ||
a445fddf | 451 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
452 | case IS_CONSTANT: |
453 | case IS_UNDEFINED: | |
77e65537 ILT |
454 | return NULL; |
455 | ||
456 | default: | |
457 | gold_unreachable(); | |
458 | } | |
459 | } | |
460 | ||
461 | // Set the symbol's output section. This is used for symbols defined | |
462 | // in scripts. This should only be called after the symbol table has | |
463 | // been finalized. | |
464 | ||
465 | void | |
466 | Symbol::set_output_section(Output_section* os) | |
467 | { | |
468 | switch (this->source_) | |
469 | { | |
470 | case FROM_OBJECT: | |
471 | case IN_OUTPUT_DATA: | |
472 | gold_assert(this->output_section() == os); | |
473 | break; | |
f3e9c5c5 | 474 | case IS_CONSTANT: |
77e65537 ILT |
475 | this->source_ = IN_OUTPUT_DATA; |
476 | this->u_.in_output_data.output_data = os; | |
477 | this->u_.in_output_data.offset_is_from_end = false; | |
478 | break; | |
479 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 480 | case IS_UNDEFINED: |
a445fddf ILT |
481 | default: |
482 | gold_unreachable(); | |
483 | } | |
484 | } | |
485 | ||
14bfc3f5 ILT |
486 | // Class Symbol_table. |
487 | ||
09124467 | 488 | Symbol_table::Symbol_table(unsigned int count, |
2ea97941 | 489 | const Version_script_info& version_script) |
6d013333 | 490 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
8a5e3e08 ILT |
491 | forwarders_(), commons_(), tls_commons_(), small_commons_(), |
492 | large_commons_(), forced_locals_(), warnings_(), | |
2ea97941 | 493 | version_script_(version_script), gc_(NULL), icf_(NULL) |
14bfc3f5 | 494 | { |
6d013333 | 495 | namepool_.reserve(count); |
14bfc3f5 ILT |
496 | } |
497 | ||
498 | Symbol_table::~Symbol_table() | |
499 | { | |
500 | } | |
501 | ||
ad8f37d1 | 502 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 503 | |
ad8f37d1 | 504 | inline size_t |
14bfc3f5 ILT |
505 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
506 | { | |
f0641a0b | 507 | return key.first ^ key.second; |
14bfc3f5 ILT |
508 | } |
509 | ||
ad8f37d1 ILT |
510 | // The symbol table key equality function. This is called with |
511 | // Stringpool keys. | |
14bfc3f5 | 512 | |
ad8f37d1 | 513 | inline bool |
14bfc3f5 ILT |
514 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
515 | const Symbol_table_key& k2) const | |
516 | { | |
517 | return k1.first == k2.first && k1.second == k2.second; | |
518 | } | |
519 | ||
ef15dade | 520 | bool |
2ea97941 | 521 | Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const |
ef15dade | 522 | { |
032ce4e9 | 523 | return (parameters->options().icf_enabled() |
2ea97941 | 524 | && this->icf_->is_section_folded(obj, shndx)); |
ef15dade ST |
525 | } |
526 | ||
6d03d481 ST |
527 | // For symbols that have been listed with -u option, add them to the |
528 | // work list to avoid gc'ing them. | |
529 | ||
530 | void | |
531 | Symbol_table::gc_mark_undef_symbols() | |
532 | { | |
533 | for (options::String_set::const_iterator p = | |
534 | parameters->options().undefined_begin(); | |
535 | p != parameters->options().undefined_end(); | |
536 | ++p) | |
537 | { | |
2ea97941 ILT |
538 | const char* name = p->c_str(); |
539 | Symbol* sym = this->lookup(name); | |
6d03d481 ST |
540 | gold_assert (sym != NULL); |
541 | if (sym->source() == Symbol::FROM_OBJECT | |
542 | && !sym->object()->is_dynamic()) | |
543 | { | |
544 | Relobj* obj = static_cast<Relobj*>(sym->object()); | |
545 | bool is_ordinary; | |
2ea97941 | 546 | unsigned int shndx = sym->shndx(&is_ordinary); |
6d03d481 ST |
547 | if (is_ordinary) |
548 | { | |
549 | gold_assert(this->gc_ != NULL); | |
2ea97941 | 550 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
551 | } |
552 | } | |
553 | } | |
554 | } | |
555 | ||
556 | void | |
557 | Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym) | |
558 | { | |
559 | if (!sym->is_from_dynobj() | |
560 | && sym->is_externally_visible()) | |
561 | { | |
562 | //Add the object and section to the work list. | |
563 | Relobj* obj = static_cast<Relobj*>(sym->object()); | |
564 | bool is_ordinary; | |
2ea97941 ILT |
565 | unsigned int shndx = sym->shndx(&is_ordinary); |
566 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF) | |
6d03d481 ST |
567 | { |
568 | gold_assert(this->gc_!= NULL); | |
2ea97941 | 569 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
570 | } |
571 | } | |
572 | } | |
573 | ||
574 | // When doing garbage collection, keep symbols that have been seen in | |
575 | // dynamic objects. | |
576 | inline void | |
577 | Symbol_table::gc_mark_dyn_syms(Symbol* sym) | |
578 | { | |
579 | if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT | |
580 | && !sym->object()->is_dynamic()) | |
581 | { | |
582 | Relobj *obj = static_cast<Relobj*>(sym->object()); | |
583 | bool is_ordinary; | |
2ea97941 ILT |
584 | unsigned int shndx = sym->shndx(&is_ordinary); |
585 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF) | |
6d03d481 ST |
586 | { |
587 | gold_assert(this->gc_ != NULL); | |
2ea97941 | 588 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
589 | } |
590 | } | |
591 | } | |
592 | ||
dd8670e5 | 593 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
594 | |
595 | void | |
596 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
597 | { | |
a3ad94ed ILT |
598 | gold_assert(from != to); |
599 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
600 | this->forwarders_[from] = to; |
601 | from->set_forwarder(); | |
602 | } | |
603 | ||
61ba1cf9 ILT |
604 | // Resolve the forwards from FROM, returning the real symbol. |
605 | ||
14bfc3f5 | 606 | Symbol* |
c06b7b0b | 607 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 608 | { |
a3ad94ed | 609 | gold_assert(from->is_forwarder()); |
c06b7b0b | 610 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 611 | this->forwarders_.find(from); |
a3ad94ed | 612 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
613 | return p->second; |
614 | } | |
615 | ||
61ba1cf9 ILT |
616 | // Look up a symbol by name. |
617 | ||
618 | Symbol* | |
2ea97941 | 619 | Symbol_table::lookup(const char* name, const char* version) const |
61ba1cf9 | 620 | { |
f0641a0b | 621 | Stringpool::Key name_key; |
2ea97941 ILT |
622 | name = this->namepool_.find(name, &name_key); |
623 | if (name == NULL) | |
61ba1cf9 | 624 | return NULL; |
f0641a0b ILT |
625 | |
626 | Stringpool::Key version_key = 0; | |
2ea97941 | 627 | if (version != NULL) |
61ba1cf9 | 628 | { |
2ea97941 ILT |
629 | version = this->namepool_.find(version, &version_key); |
630 | if (version == NULL) | |
61ba1cf9 ILT |
631 | return NULL; |
632 | } | |
633 | ||
f0641a0b | 634 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
635 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
636 | if (p == this->table_.end()) | |
637 | return NULL; | |
638 | return p->second; | |
639 | } | |
640 | ||
14bfc3f5 ILT |
641 | // Resolve a Symbol with another Symbol. This is only used in the |
642 | // unusual case where there are references to both an unversioned | |
643 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
644 | // version is the default version. Because this is unusual, we do |
645 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 646 | |
1564db8d | 647 | template<int size, bool big_endian> |
14bfc3f5 | 648 | void |
95d14cd3 | 649 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 650 | { |
1564db8d ILT |
651 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
652 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 653 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
654 | esym.put_st_value(from->value()); |
655 | esym.put_st_size(from->symsize()); | |
656 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 657 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e | 658 | bool is_ordinary; |
2ea97941 ILT |
659 | unsigned int shndx = from->shndx(&is_ordinary); |
660 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
95d14cd3 | 661 | from->version()); |
1ebd95fd ILT |
662 | if (from->in_reg()) |
663 | to->set_in_reg(); | |
664 | if (from->in_dyn()) | |
665 | to->set_in_dyn(); | |
6d03d481 ST |
666 | if (parameters->options().gc_sections()) |
667 | this->gc_mark_dyn_syms(to); | |
14bfc3f5 ILT |
668 | } |
669 | ||
0602e05a ILT |
670 | // Record that a symbol is forced to be local by a version script or |
671 | // by visibility. | |
55a93433 ILT |
672 | |
673 | void | |
674 | Symbol_table::force_local(Symbol* sym) | |
675 | { | |
676 | if (!sym->is_defined() && !sym->is_common()) | |
677 | return; | |
678 | if (sym->is_forced_local()) | |
679 | { | |
680 | // We already got this one. | |
681 | return; | |
682 | } | |
683 | sym->set_is_forced_local(); | |
684 | this->forced_locals_.push_back(sym); | |
685 | } | |
686 | ||
0864d551 ILT |
687 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
688 | // is only called for undefined symbols, when at least one --wrap | |
689 | // option was used. | |
690 | ||
691 | const char* | |
2ea97941 | 692 | Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key) |
0864d551 ILT |
693 | { |
694 | // For some targets, we need to ignore a specific character when | |
695 | // wrapping, and add it back later. | |
696 | char prefix = '\0'; | |
2ea97941 | 697 | if (name[0] == parameters->target().wrap_char()) |
0864d551 | 698 | { |
2ea97941 ILT |
699 | prefix = name[0]; |
700 | ++name; | |
0864d551 ILT |
701 | } |
702 | ||
2ea97941 | 703 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
704 | { |
705 | // Turn NAME into __wrap_NAME. | |
706 | std::string s; | |
707 | if (prefix != '\0') | |
708 | s += prefix; | |
709 | s += "__wrap_"; | |
2ea97941 | 710 | s += name; |
0864d551 ILT |
711 | |
712 | // This will give us both the old and new name in NAMEPOOL_, but | |
713 | // that is OK. Only the versions we need will wind up in the | |
714 | // real string table in the output file. | |
715 | return this->namepool_.add(s.c_str(), true, name_key); | |
716 | } | |
717 | ||
718 | const char* const real_prefix = "__real_"; | |
719 | const size_t real_prefix_length = strlen(real_prefix); | |
2ea97941 ILT |
720 | if (strncmp(name, real_prefix, real_prefix_length) == 0 |
721 | && parameters->options().is_wrap(name + real_prefix_length)) | |
0864d551 ILT |
722 | { |
723 | // Turn __real_NAME into NAME. | |
724 | std::string s; | |
725 | if (prefix != '\0') | |
726 | s += prefix; | |
2ea97941 | 727 | s += name + real_prefix_length; |
0864d551 ILT |
728 | return this->namepool_.add(s.c_str(), true, name_key); |
729 | } | |
730 | ||
2ea97941 | 731 | return name; |
0864d551 ILT |
732 | } |
733 | ||
8c500701 ILT |
734 | // This is called when we see a symbol NAME/VERSION, and the symbol |
735 | // already exists in the symbol table, and VERSION is marked as being | |
736 | // the default version. SYM is the NAME/VERSION symbol we just added. | |
737 | // DEFAULT_IS_NEW is true if this is the first time we have seen the | |
738 | // symbol NAME/NULL. PDEF points to the entry for NAME/NULL. | |
739 | ||
740 | template<int size, bool big_endian> | |
741 | void | |
742 | Symbol_table::define_default_version(Sized_symbol<size>* sym, | |
743 | bool default_is_new, | |
744 | Symbol_table_type::iterator pdef) | |
745 | { | |
746 | if (default_is_new) | |
747 | { | |
748 | // This is the first time we have seen NAME/NULL. Make | |
749 | // NAME/NULL point to NAME/VERSION, and mark SYM as the default | |
750 | // version. | |
751 | pdef->second = sym; | |
752 | sym->set_is_default(); | |
753 | } | |
754 | else if (pdef->second == sym) | |
755 | { | |
756 | // NAME/NULL already points to NAME/VERSION. Don't mark the | |
757 | // symbol as the default if it is not already the default. | |
758 | } | |
759 | else | |
760 | { | |
761 | // This is the unfortunate case where we already have entries | |
762 | // for both NAME/VERSION and NAME/NULL. We now see a symbol | |
763 | // NAME/VERSION where VERSION is the default version. We have | |
764 | // already resolved this new symbol with the existing | |
765 | // NAME/VERSION symbol. | |
766 | ||
767 | // It's possible that NAME/NULL and NAME/VERSION are both | |
768 | // defined in regular objects. This can only happen if one | |
769 | // object file defines foo and another defines foo@@ver. This | |
770 | // is somewhat obscure, but we call it a multiple definition | |
771 | // error. | |
772 | ||
773 | // It's possible that NAME/NULL actually has a version, in which | |
774 | // case it won't be the same as VERSION. This happens with | |
775 | // ver_test_7.so in the testsuite for the symbol t2_2. We see | |
776 | // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We | |
777 | // then see an unadorned t2_2 in an object file and give it | |
778 | // version VER1 from the version script. This looks like a | |
779 | // default definition for VER1, so it looks like we should merge | |
780 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's | |
781 | // not obvious that this is an error, either. So we just punt. | |
782 | ||
783 | // If one of the symbols has non-default visibility, and the | |
784 | // other is defined in a shared object, then they are different | |
785 | // symbols. | |
786 | ||
787 | // Otherwise, we just resolve the symbols as though they were | |
788 | // the same. | |
789 | ||
790 | if (pdef->second->version() != NULL) | |
791 | gold_assert(pdef->second->version() != sym->version()); | |
792 | else if (sym->visibility() != elfcpp::STV_DEFAULT | |
793 | && pdef->second->is_from_dynobj()) | |
794 | ; | |
795 | else if (pdef->second->visibility() != elfcpp::STV_DEFAULT | |
796 | && sym->is_from_dynobj()) | |
797 | ; | |
798 | else | |
799 | { | |
800 | const Sized_symbol<size>* symdef; | |
801 | symdef = this->get_sized_symbol<size>(pdef->second); | |
802 | Symbol_table::resolve<size, big_endian>(sym, symdef); | |
803 | this->make_forwarder(pdef->second, sym); | |
804 | pdef->second = sym; | |
805 | sym->set_is_default(); | |
806 | } | |
807 | } | |
808 | } | |
809 | ||
14bfc3f5 ILT |
810 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
811 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
812 | // whether this is the default version. ST_SHNDX is the symbol's |
813 | // section index; IS_ORDINARY is whether this is a normal section | |
814 | // rather than a special code. | |
14bfc3f5 | 815 | |
8781f709 ILT |
816 | // If IS_DEFAULT_VERSION is true, then this is the definition of a |
817 | // default version of a symbol. That means that any lookup of | |
818 | // NAME/NULL and any lookup of NAME/VERSION should always return the | |
819 | // same symbol. This is obvious for references, but in particular we | |
820 | // want to do this for definitions: overriding NAME/NULL should also | |
821 | // override NAME/VERSION. If we don't do that, it would be very hard | |
822 | // to override functions in a shared library which uses versioning. | |
14bfc3f5 ILT |
823 | |
824 | // We implement this by simply making both entries in the hash table | |
825 | // point to the same Symbol structure. That is easy enough if this is | |
826 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
827 | // that we have seen both already, in which case they will both have | |
828 | // independent entries in the symbol table. We can't simply change | |
829 | // the symbol table entry, because we have pointers to the entries | |
830 | // attached to the object files. So we mark the entry attached to the | |
831 | // object file as a forwarder, and record it in the forwarders_ map. | |
832 | // Note that entries in the hash table will never be marked as | |
833 | // forwarders. | |
70e654ba | 834 | // |
d491d34e ILT |
835 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
836 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
837 | // for a special section code. ST_SHNDX may be modified if the symbol | |
838 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
839 | |
840 | template<int size, bool big_endian> | |
aeddab66 | 841 | Sized_symbol<size>* |
2ea97941 ILT |
842 | Symbol_table::add_from_object(Object* object, |
843 | const char *name, | |
f0641a0b | 844 | Stringpool::Key name_key, |
2ea97941 | 845 | const char *version, |
f0641a0b | 846 | Stringpool::Key version_key, |
8781f709 | 847 | bool is_default_version, |
70e654ba | 848 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
849 | unsigned int st_shndx, |
850 | bool is_ordinary, | |
851 | unsigned int orig_st_shndx) | |
14bfc3f5 | 852 | { |
c5818ff1 | 853 | // Print a message if this symbol is being traced. |
2ea97941 | 854 | if (parameters->options().is_trace_symbol(name)) |
c5818ff1 | 855 | { |
d491d34e | 856 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
2ea97941 | 857 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
c5818ff1 | 858 | else |
2ea97941 | 859 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); |
c5818ff1 CC |
860 | } |
861 | ||
0864d551 ILT |
862 | // For an undefined symbol, we may need to adjust the name using |
863 | // --wrap. | |
d491d34e | 864 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 865 | && parameters->options().any_wrap()) |
0864d551 | 866 | { |
2ea97941 ILT |
867 | const char* wrap_name = this->wrap_symbol(name, &name_key); |
868 | if (wrap_name != name) | |
0864d551 ILT |
869 | { |
870 | // If we see a reference to malloc with version GLIBC_2.0, | |
871 | // and we turn it into a reference to __wrap_malloc, then we | |
872 | // discard the version number. Otherwise the user would be | |
873 | // required to specify the correct version for | |
874 | // __wrap_malloc. | |
2ea97941 | 875 | version = NULL; |
0864d551 | 876 | version_key = 0; |
2ea97941 | 877 | name = wrap_name; |
0864d551 ILT |
878 | } |
879 | } | |
880 | ||
14bfc3f5 ILT |
881 | Symbol* const snull = NULL; |
882 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
883 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
884 | snull)); | |
14bfc3f5 | 885 | |
8781f709 | 886 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
14bfc3f5 | 887 | std::make_pair(this->table_.end(), false); |
8781f709 | 888 | if (is_default_version) |
14bfc3f5 | 889 | { |
f0641a0b | 890 | const Stringpool::Key vnull_key = 0; |
8781f709 ILT |
891 | insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key, |
892 | vnull_key), | |
893 | snull)); | |
14bfc3f5 ILT |
894 | } |
895 | ||
896 | // ins.first: an iterator, which is a pointer to a pair. | |
897 | // ins.first->first: the key (a pair of name and version). | |
898 | // ins.first->second: the value (Symbol*). | |
899 | // ins.second: true if new entry was inserted, false if not. | |
900 | ||
1564db8d | 901 | Sized_symbol<size>* ret; |
ead1e424 ILT |
902 | bool was_undefined; |
903 | bool was_common; | |
14bfc3f5 ILT |
904 | if (!ins.second) |
905 | { | |
906 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 907 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 908 | gold_assert(ret != NULL); |
ead1e424 ILT |
909 | |
910 | was_undefined = ret->is_undefined(); | |
911 | was_common = ret->is_common(); | |
912 | ||
2ea97941 ILT |
913 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
914 | version); | |
6d03d481 ST |
915 | if (parameters->options().gc_sections()) |
916 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 | 917 | |
8781f709 ILT |
918 | if (is_default_version) |
919 | this->define_default_version<size, big_endian>(ret, insdefault.second, | |
920 | insdefault.first); | |
14bfc3f5 ILT |
921 | } |
922 | else | |
923 | { | |
924 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 925 | gold_assert(ins.first->second == NULL); |
ead1e424 | 926 | |
8781f709 | 927 | if (is_default_version && !insdefault.second) |
14bfc3f5 | 928 | { |
14b31740 ILT |
929 | // We already have an entry for NAME/NULL. If we override |
930 | // it, then change it to NAME/VERSION. | |
8781f709 | 931 | ret = this->get_sized_symbol<size>(insdefault.first->second); |
18e6b24e ILT |
932 | |
933 | was_undefined = ret->is_undefined(); | |
934 | was_common = ret->is_common(); | |
935 | ||
2ea97941 ILT |
936 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
937 | version); | |
6d03d481 ST |
938 | if (parameters->options().gc_sections()) |
939 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 ILT |
940 | ins.first->second = ret; |
941 | } | |
942 | else | |
943 | { | |
18e6b24e ILT |
944 | was_undefined = false; |
945 | was_common = false; | |
946 | ||
f6ce93d6 | 947 | Sized_target<size, big_endian>* target = |
029ba973 | 948 | parameters->sized_target<size, big_endian>(); |
1564db8d ILT |
949 | if (!target->has_make_symbol()) |
950 | ret = new Sized_symbol<size>(); | |
951 | else | |
14bfc3f5 | 952 | { |
1564db8d ILT |
953 | ret = target->make_symbol(); |
954 | if (ret == NULL) | |
14bfc3f5 ILT |
955 | { |
956 | // This means that we don't want a symbol table | |
957 | // entry after all. | |
8781f709 | 958 | if (!is_default_version) |
14bfc3f5 ILT |
959 | this->table_.erase(ins.first); |
960 | else | |
961 | { | |
8781f709 ILT |
962 | this->table_.erase(insdefault.first); |
963 | // Inserting INSDEFAULT invalidated INS. | |
f0641a0b ILT |
964 | this->table_.erase(std::make_pair(name_key, |
965 | version_key)); | |
14bfc3f5 ILT |
966 | } |
967 | return NULL; | |
968 | } | |
969 | } | |
14bfc3f5 | 970 | |
2ea97941 | 971 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 972 | |
14bfc3f5 | 973 | ins.first->second = ret; |
8781f709 | 974 | if (is_default_version) |
14bfc3f5 ILT |
975 | { |
976 | // This is the first time we have seen NAME/NULL. Point | |
977 | // it at the new entry for NAME/VERSION. | |
8781f709 ILT |
978 | gold_assert(insdefault.second); |
979 | insdefault.first->second = ret; | |
14bfc3f5 ILT |
980 | } |
981 | } | |
8c500701 | 982 | |
8781f709 | 983 | if (is_default_version) |
8c500701 | 984 | ret->set_is_default(); |
14bfc3f5 ILT |
985 | } |
986 | ||
ead1e424 ILT |
987 | // Record every time we see a new undefined symbol, to speed up |
988 | // archive groups. | |
989 | if (!was_undefined && ret->is_undefined()) | |
990 | ++this->saw_undefined_; | |
991 | ||
992 | // Keep track of common symbols, to speed up common symbol | |
993 | // allocation. | |
994 | if (!was_common && ret->is_common()) | |
155a0dd7 | 995 | { |
8a5e3e08 | 996 | if (ret->type() == elfcpp::STT_TLS) |
155a0dd7 | 997 | this->tls_commons_.push_back(ret); |
8a5e3e08 ILT |
998 | else if (!is_ordinary |
999 | && st_shndx == parameters->target().small_common_shndx()) | |
1000 | this->small_commons_.push_back(ret); | |
1001 | else if (!is_ordinary | |
1002 | && st_shndx == parameters->target().large_common_shndx()) | |
1003 | this->large_commons_.push_back(ret); | |
1004 | else | |
1005 | this->commons_.push_back(ret); | |
155a0dd7 | 1006 | } |
ead1e424 | 1007 | |
0602e05a ILT |
1008 | // If we're not doing a relocatable link, then any symbol with |
1009 | // hidden or internal visibility is local. | |
1010 | if ((ret->visibility() == elfcpp::STV_HIDDEN | |
1011 | || ret->visibility() == elfcpp::STV_INTERNAL) | |
1012 | && (ret->binding() == elfcpp::STB_GLOBAL | |
adcf2816 | 1013 | || ret->binding() == elfcpp::STB_GNU_UNIQUE |
0602e05a ILT |
1014 | || ret->binding() == elfcpp::STB_WEAK) |
1015 | && !parameters->options().relocatable()) | |
1016 | this->force_local(ret); | |
1017 | ||
14bfc3f5 ILT |
1018 | return ret; |
1019 | } | |
1020 | ||
f6ce93d6 | 1021 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
1022 | |
1023 | template<int size, bool big_endian> | |
1024 | void | |
dbe717ef ILT |
1025 | Symbol_table::add_from_relobj( |
1026 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 1027 | const unsigned char* syms, |
14bfc3f5 | 1028 | size_t count, |
d491d34e | 1029 | size_t symndx_offset, |
14bfc3f5 ILT |
1030 | const char* sym_names, |
1031 | size_t sym_name_size, | |
92de84a6 ILT |
1032 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, |
1033 | size_t *defined) | |
14bfc3f5 | 1034 | { |
92de84a6 ILT |
1035 | *defined = 0; |
1036 | ||
8851ecca | 1037 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 1038 | |
a783673b ILT |
1039 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
1040 | ||
88dd47ac ILT |
1041 | const bool just_symbols = relobj->just_symbols(); |
1042 | ||
f6ce93d6 | 1043 | const unsigned char* p = syms; |
a783673b | 1044 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 1045 | { |
92de84a6 ILT |
1046 | (*sympointers)[i] = NULL; |
1047 | ||
14bfc3f5 ILT |
1048 | elfcpp::Sym<size, big_endian> sym(p); |
1049 | ||
d491d34e | 1050 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
1051 | if (st_name >= sym_name_size) |
1052 | { | |
75f2446e ILT |
1053 | relobj->error(_("bad global symbol name offset %u at %zu"), |
1054 | st_name, i); | |
1055 | continue; | |
14bfc3f5 ILT |
1056 | } |
1057 | ||
2ea97941 | 1058 | const char* name = sym_names + st_name; |
dbe717ef | 1059 | |
d491d34e ILT |
1060 | bool is_ordinary; |
1061 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
1062 | sym.get_st_shndx(), | |
1063 | &is_ordinary); | |
1064 | unsigned int orig_st_shndx = st_shndx; | |
1065 | if (!is_ordinary) | |
1066 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
1067 | ||
92de84a6 ILT |
1068 | if (st_shndx != elfcpp::SHN_UNDEF) |
1069 | ++*defined; | |
1070 | ||
a783673b ILT |
1071 | // A symbol defined in a section which we are not including must |
1072 | // be treated as an undefined symbol. | |
880cd20d | 1073 | bool is_defined_in_discarded_section = false; |
a783673b | 1074 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 1075 | && is_ordinary |
ce97fa81 ST |
1076 | && !relobj->is_section_included(st_shndx) |
1077 | && !this->is_section_folded(relobj, st_shndx)) | |
880cd20d ILT |
1078 | { |
1079 | st_shndx = elfcpp::SHN_UNDEF; | |
1080 | is_defined_in_discarded_section = true; | |
1081 | } | |
a783673b | 1082 | |
14bfc3f5 ILT |
1083 | // In an object file, an '@' in the name separates the symbol |
1084 | // name from the version name. If there are two '@' characters, | |
1085 | // this is the default version. | |
2ea97941 | 1086 | const char* ver = strchr(name, '@'); |
057ead22 | 1087 | Stringpool::Key ver_key = 0; |
09124467 | 1088 | int namelen = 0; |
8781f709 ILT |
1089 | // IS_DEFAULT_VERSION: is the version default? |
1090 | // IS_FORCED_LOCAL: is the symbol forced local? | |
1091 | bool is_default_version = false; | |
1092 | bool is_forced_local = false; | |
09124467 ILT |
1093 | |
1094 | if (ver != NULL) | |
1095 | { | |
1096 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
2ea97941 | 1097 | namelen = ver - name; |
09124467 ILT |
1098 | ++ver; |
1099 | if (*ver == '@') | |
1100 | { | |
8781f709 | 1101 | is_default_version = true; |
09124467 ILT |
1102 | ++ver; |
1103 | } | |
057ead22 | 1104 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 1105 | } |
5871526f ILT |
1106 | // We don't want to assign a version to an undefined symbol, |
1107 | // even if it is listed in the version script. FIXME: What | |
1108 | // about a common symbol? | |
057ead22 ILT |
1109 | else |
1110 | { | |
2ea97941 | 1111 | namelen = strlen(name); |
057ead22 ILT |
1112 | if (!this->version_script_.empty() |
1113 | && st_shndx != elfcpp::SHN_UNDEF) | |
1114 | { | |
1115 | // The symbol name did not have a version, but the | |
1116 | // version script may assign a version anyway. | |
2ea97941 | 1117 | std::string version; |
98e090bd ILT |
1118 | bool is_global; |
1119 | if (this->version_script_.get_symbol_version(name, &version, | |
1120 | &is_global)) | |
057ead22 | 1121 | { |
98e090bd ILT |
1122 | if (!is_global) |
1123 | is_forced_local = true; | |
1124 | else if (!version.empty()) | |
057ead22 | 1125 | { |
2ea97941 ILT |
1126 | ver = this->namepool_.add_with_length(version.c_str(), |
1127 | version.length(), | |
057ead22 ILT |
1128 | true, |
1129 | &ver_key); | |
8781f709 | 1130 | is_default_version = true; |
057ead22 ILT |
1131 | } |
1132 | } | |
057ead22 ILT |
1133 | } |
1134 | } | |
14bfc3f5 | 1135 | |
d491d34e ILT |
1136 | elfcpp::Sym<size, big_endian>* psym = &sym; |
1137 | unsigned char symbuf[sym_size]; | |
1138 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
1139 | if (just_symbols) |
1140 | { | |
d491d34e | 1141 | memcpy(symbuf, p, sym_size); |
88dd47ac | 1142 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
d491d34e | 1143 | if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary) |
88dd47ac ILT |
1144 | { |
1145 | // Symbol values in object files are section relative. | |
1146 | // This is normally what we want, but since here we are | |
1147 | // converting the symbol to absolute we need to add the | |
1148 | // section address. The section address in an object | |
1149 | // file is normally zero, but people can use a linker | |
1150 | // script to change it. | |
d491d34e ILT |
1151 | sw.put_st_value(sym.get_st_value() |
1152 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 1153 | } |
d491d34e ILT |
1154 | st_shndx = elfcpp::SHN_ABS; |
1155 | is_ordinary = false; | |
88dd47ac ILT |
1156 | psym = &sym2; |
1157 | } | |
1158 | ||
65514900 | 1159 | // Fix up visibility if object has no-export set. |
1c74fab0 ILT |
1160 | if (relobj->no_export() |
1161 | && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary)) | |
65514900 CC |
1162 | { |
1163 | // We may have copied symbol already above. | |
1164 | if (psym != &sym2) | |
1165 | { | |
1166 | memcpy(symbuf, p, sym_size); | |
1167 | psym = &sym2; | |
1168 | } | |
1169 | ||
1170 | elfcpp::STV visibility = sym2.get_st_visibility(); | |
1171 | if (visibility == elfcpp::STV_DEFAULT | |
1172 | || visibility == elfcpp::STV_PROTECTED) | |
1173 | { | |
1174 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1175 | unsigned char nonvis = sym2.get_st_nonvis(); | |
1176 | sw.put_st_other(elfcpp::STV_HIDDEN, nonvis); | |
1177 | } | |
1178 | } | |
1179 | ||
057ead22 | 1180 | Stringpool::Key name_key; |
2ea97941 | 1181 | name = this->namepool_.add_with_length(name, namelen, true, |
057ead22 ILT |
1182 | &name_key); |
1183 | ||
aeddab66 | 1184 | Sized_symbol<size>* res; |
2ea97941 | 1185 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
8781f709 ILT |
1186 | is_default_version, *psym, st_shndx, |
1187 | is_ordinary, orig_st_shndx); | |
6d03d481 ST |
1188 | |
1189 | // If building a shared library using garbage collection, do not | |
1190 | // treat externally visible symbols as garbage. | |
1191 | if (parameters->options().gc_sections() | |
1192 | && parameters->options().shared()) | |
1193 | this->gc_mark_symbol_for_shlib(res); | |
f0641a0b | 1194 | |
8781f709 | 1195 | if (is_forced_local) |
057ead22 | 1196 | this->force_local(res); |
14bfc3f5 | 1197 | |
880cd20d ILT |
1198 | if (is_defined_in_discarded_section) |
1199 | res->set_is_defined_in_discarded_section(); | |
1200 | ||
730cdc88 | 1201 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
1202 | } |
1203 | } | |
1204 | ||
89fc3421 CC |
1205 | // Add a symbol from a plugin-claimed file. |
1206 | ||
1207 | template<int size, bool big_endian> | |
1208 | Symbol* | |
1209 | Symbol_table::add_from_pluginobj( | |
1210 | Sized_pluginobj<size, big_endian>* obj, | |
2ea97941 | 1211 | const char* name, |
89fc3421 CC |
1212 | const char* ver, |
1213 | elfcpp::Sym<size, big_endian>* sym) | |
1214 | { | |
1215 | unsigned int st_shndx = sym->get_st_shndx(); | |
24998053 | 1216 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
89fc3421 CC |
1217 | |
1218 | Stringpool::Key ver_key = 0; | |
8781f709 ILT |
1219 | bool is_default_version = false; |
1220 | bool is_forced_local = false; | |
89fc3421 CC |
1221 | |
1222 | if (ver != NULL) | |
1223 | { | |
1224 | ver = this->namepool_.add(ver, true, &ver_key); | |
1225 | } | |
1226 | // We don't want to assign a version to an undefined symbol, | |
1227 | // even if it is listed in the version script. FIXME: What | |
1228 | // about a common symbol? | |
1229 | else | |
1230 | { | |
1231 | if (!this->version_script_.empty() | |
1232 | && st_shndx != elfcpp::SHN_UNDEF) | |
1233 | { | |
1234 | // The symbol name did not have a version, but the | |
1235 | // version script may assign a version anyway. | |
2ea97941 | 1236 | std::string version; |
98e090bd ILT |
1237 | bool is_global; |
1238 | if (this->version_script_.get_symbol_version(name, &version, | |
1239 | &is_global)) | |
89fc3421 | 1240 | { |
98e090bd ILT |
1241 | if (!is_global) |
1242 | is_forced_local = true; | |
1243 | else if (!version.empty()) | |
89fc3421 | 1244 | { |
2ea97941 ILT |
1245 | ver = this->namepool_.add_with_length(version.c_str(), |
1246 | version.length(), | |
89fc3421 CC |
1247 | true, |
1248 | &ver_key); | |
8781f709 | 1249 | is_default_version = true; |
89fc3421 CC |
1250 | } |
1251 | } | |
89fc3421 CC |
1252 | } |
1253 | } | |
1254 | ||
1255 | Stringpool::Key name_key; | |
2ea97941 | 1256 | name = this->namepool_.add(name, true, &name_key); |
89fc3421 CC |
1257 | |
1258 | Sized_symbol<size>* res; | |
2ea97941 | 1259 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
8781f709 ILT |
1260 | is_default_version, *sym, st_shndx, |
1261 | is_ordinary, st_shndx); | |
89fc3421 | 1262 | |
8781f709 | 1263 | if (is_forced_local) |
0602e05a | 1264 | this->force_local(res); |
89fc3421 CC |
1265 | |
1266 | return res; | |
1267 | } | |
1268 | ||
dbe717ef ILT |
1269 | // Add all the symbols in a dynamic object to the hash table. |
1270 | ||
1271 | template<int size, bool big_endian> | |
1272 | void | |
1273 | Symbol_table::add_from_dynobj( | |
1274 | Sized_dynobj<size, big_endian>* dynobj, | |
1275 | const unsigned char* syms, | |
1276 | size_t count, | |
1277 | const char* sym_names, | |
1278 | size_t sym_name_size, | |
1279 | const unsigned char* versym, | |
1280 | size_t versym_size, | |
92de84a6 ILT |
1281 | const std::vector<const char*>* version_map, |
1282 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, | |
1283 | size_t* defined) | |
dbe717ef | 1284 | { |
92de84a6 ILT |
1285 | *defined = 0; |
1286 | ||
8851ecca | 1287 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1288 | |
88dd47ac ILT |
1289 | if (dynobj->just_symbols()) |
1290 | { | |
1291 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1292 | return; | |
1293 | } | |
1294 | ||
dbe717ef ILT |
1295 | if (versym != NULL && versym_size / 2 < count) |
1296 | { | |
75f2446e ILT |
1297 | dynobj->error(_("too few symbol versions")); |
1298 | return; | |
dbe717ef ILT |
1299 | } |
1300 | ||
1301 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1302 | ||
aeddab66 ILT |
1303 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1304 | // weak aliases. This is necessary because if the dynamic object | |
1305 | // provides the same variable under two names, one of which is a | |
1306 | // weak definition, and the regular object refers to the weak | |
1307 | // definition, we have to put both the weak definition and the | |
1308 | // strong definition into the dynamic symbol table. Given a weak | |
1309 | // definition, the only way that we can find the corresponding | |
1310 | // strong definition, if any, is to search the symbol table. | |
1311 | std::vector<Sized_symbol<size>*> object_symbols; | |
1312 | ||
dbe717ef ILT |
1313 | const unsigned char* p = syms; |
1314 | const unsigned char* vs = versym; | |
1315 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1316 | { | |
1317 | elfcpp::Sym<size, big_endian> sym(p); | |
1318 | ||
92de84a6 ILT |
1319 | if (sympointers != NULL) |
1320 | (*sympointers)[i] = NULL; | |
1321 | ||
65778909 ILT |
1322 | // Ignore symbols with local binding or that have |
1323 | // internal or hidden visibility. | |
1324 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1325 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1326 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1327 | continue; |
1328 | ||
8bdcdf2c ILT |
1329 | // A protected symbol in a shared library must be treated as a |
1330 | // normal symbol when viewed from outside the shared library. | |
1331 | // Implement this by overriding the visibility here. | |
1332 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1333 | unsigned char symbuf[sym_size]; | |
1334 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1335 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1336 | { | |
1337 | memcpy(symbuf, p, sym_size); | |
1338 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1339 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1340 | psym = &sym2; | |
1341 | } | |
1342 | ||
1343 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1344 | if (st_name >= sym_name_size) |
1345 | { | |
75f2446e ILT |
1346 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1347 | st_name, i); | |
1348 | continue; | |
dbe717ef ILT |
1349 | } |
1350 | ||
2ea97941 | 1351 | const char* name = sym_names + st_name; |
dbe717ef | 1352 | |
d491d34e | 1353 | bool is_ordinary; |
8bdcdf2c | 1354 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1355 | &is_ordinary); |
1356 | ||
92de84a6 ILT |
1357 | if (st_shndx != elfcpp::SHN_UNDEF) |
1358 | ++*defined; | |
1359 | ||
aeddab66 ILT |
1360 | Sized_symbol<size>* res; |
1361 | ||
dbe717ef ILT |
1362 | if (versym == NULL) |
1363 | { | |
1364 | Stringpool::Key name_key; | |
2ea97941 ILT |
1365 | name = this->namepool_.add(name, true, &name_key); |
1366 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1367 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1368 | st_shndx); |
dbe717ef | 1369 | } |
aeddab66 ILT |
1370 | else |
1371 | { | |
1372 | // Read the version information. | |
dbe717ef | 1373 | |
aeddab66 | 1374 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1375 | |
aeddab66 ILT |
1376 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1377 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1378 | |
aeddab66 ILT |
1379 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1380 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1381 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1382 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1383 | // for an undefined symbol. I don't know what the Sun | |
1384 | // linker will generate. | |
dbe717ef | 1385 | |
aeddab66 | 1386 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1387 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1388 | { |
1389 | // This symbol should not be visible outside the object. | |
1390 | continue; | |
1391 | } | |
64707334 | 1392 | |
aeddab66 ILT |
1393 | // At this point we are definitely going to add this symbol. |
1394 | Stringpool::Key name_key; | |
2ea97941 | 1395 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 1396 | |
aeddab66 ILT |
1397 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1398 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1399 | { | |
1400 | // This symbol does not have a version. | |
2ea97941 | 1401 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1402 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1403 | st_shndx); |
aeddab66 ILT |
1404 | } |
1405 | else | |
1406 | { | |
1407 | if (v >= version_map->size()) | |
1408 | { | |
1409 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1410 | i, v); | |
1411 | continue; | |
1412 | } | |
dbe717ef | 1413 | |
2ea97941 ILT |
1414 | const char* version = (*version_map)[v]; |
1415 | if (version == NULL) | |
aeddab66 ILT |
1416 | { |
1417 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1418 | i, v); | |
1419 | continue; | |
1420 | } | |
dbe717ef | 1421 | |
aeddab66 | 1422 | Stringpool::Key version_key; |
2ea97941 | 1423 | version = this->namepool_.add(version, true, &version_key); |
aeddab66 ILT |
1424 | |
1425 | // If this is an absolute symbol, and the version name | |
1426 | // and symbol name are the same, then this is the | |
1427 | // version definition symbol. These symbols exist to | |
1428 | // support using -u to pull in particular versions. We | |
1429 | // do not want to record a version for them. | |
d491d34e ILT |
1430 | if (st_shndx == elfcpp::SHN_ABS |
1431 | && !is_ordinary | |
aeddab66 | 1432 | && name_key == version_key) |
2ea97941 | 1433 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1434 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1435 | st_shndx); |
aeddab66 ILT |
1436 | else |
1437 | { | |
8781f709 ILT |
1438 | const bool is_default_version = |
1439 | !hidden && st_shndx != elfcpp::SHN_UNDEF; | |
2ea97941 | 1440 | res = this->add_from_object(dynobj, name, name_key, version, |
8781f709 ILT |
1441 | version_key, is_default_version, |
1442 | *psym, st_shndx, | |
d491d34e | 1443 | is_ordinary, st_shndx); |
aeddab66 ILT |
1444 | } |
1445 | } | |
dbe717ef ILT |
1446 | } |
1447 | ||
99a37bfd | 1448 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1449 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1450 | if (st_shndx != elfcpp::SHN_UNDEF |
1451 | && is_ordinary | |
8bdcdf2c | 1452 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1453 | && res->source() == Symbol::FROM_OBJECT |
1454 | && res->object() == dynobj) | |
aeddab66 | 1455 | object_symbols.push_back(res); |
92de84a6 ILT |
1456 | |
1457 | if (sympointers != NULL) | |
1458 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1459 | } |
1460 | ||
1461 | this->record_weak_aliases(&object_symbols); | |
1462 | } | |
1463 | ||
1464 | // This is used to sort weak aliases. We sort them first by section | |
1465 | // index, then by offset, then by weak ahead of strong. | |
1466 | ||
1467 | template<int size> | |
1468 | class Weak_alias_sorter | |
1469 | { | |
1470 | public: | |
1471 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1472 | }; | |
1473 | ||
1474 | template<int size> | |
1475 | bool | |
1476 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1477 | const Sized_symbol<size>* s2) const | |
1478 | { | |
d491d34e ILT |
1479 | bool is_ordinary; |
1480 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1481 | gold_assert(is_ordinary); | |
1482 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1483 | gold_assert(is_ordinary); | |
1484 | if (s1_shndx != s2_shndx) | |
1485 | return s1_shndx < s2_shndx; | |
1486 | ||
aeddab66 ILT |
1487 | if (s1->value() != s2->value()) |
1488 | return s1->value() < s2->value(); | |
1489 | if (s1->binding() != s2->binding()) | |
1490 | { | |
1491 | if (s1->binding() == elfcpp::STB_WEAK) | |
1492 | return true; | |
1493 | if (s2->binding() == elfcpp::STB_WEAK) | |
1494 | return false; | |
1495 | } | |
1496 | return std::string(s1->name()) < std::string(s2->name()); | |
1497 | } | |
dbe717ef | 1498 | |
aeddab66 ILT |
1499 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1500 | // for any weak aliases, and record them so that if we add the weak | |
1501 | // alias to the dynamic symbol table, we also add the corresponding | |
1502 | // strong symbol. | |
dbe717ef | 1503 | |
aeddab66 ILT |
1504 | template<int size> |
1505 | void | |
1506 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1507 | { | |
1508 | // Sort the vector by section index, then by offset, then by weak | |
1509 | // ahead of strong. | |
1510 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1511 | ||
1512 | // Walk through the vector. For each weak definition, record | |
1513 | // aliases. | |
1514 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1515 | symbols->begin(); | |
1516 | p != symbols->end(); | |
1517 | ++p) | |
1518 | { | |
1519 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1520 | continue; | |
1521 | ||
1522 | // Build a circular list of weak aliases. Each symbol points to | |
1523 | // the next one in the circular list. | |
1524 | ||
1525 | Sized_symbol<size>* from_sym = *p; | |
1526 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1527 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1528 | { |
d491d34e ILT |
1529 | bool dummy; |
1530 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1531 | || (*q)->value() != from_sym->value()) |
1532 | break; | |
1533 | ||
1534 | this->weak_aliases_[from_sym] = *q; | |
1535 | from_sym->set_has_alias(); | |
1536 | from_sym = *q; | |
dbe717ef ILT |
1537 | } |
1538 | ||
aeddab66 ILT |
1539 | if (from_sym != *p) |
1540 | { | |
1541 | this->weak_aliases_[from_sym] = *p; | |
1542 | from_sym->set_has_alias(); | |
1543 | } | |
dbe717ef | 1544 | |
aeddab66 | 1545 | p = q - 1; |
dbe717ef ILT |
1546 | } |
1547 | } | |
1548 | ||
ead1e424 ILT |
1549 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1550 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1551 | // If this does not return NULL, it sets *POLDSYM to the existing |
8c500701 ILT |
1552 | // symbol if there is one. This sets *RESOLVE_OLDSYM if we should |
1553 | // resolve the newly created symbol to the old one. This | |
1554 | // canonicalizes *PNAME and *PVERSION. | |
ead1e424 ILT |
1555 | |
1556 | template<int size, bool big_endian> | |
1557 | Sized_symbol<size>* | |
9b07f471 ILT |
1558 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1559 | bool only_if_ref, | |
8c500701 ILT |
1560 | Sized_symbol<size>** poldsym, |
1561 | bool *resolve_oldsym) | |
ead1e424 | 1562 | { |
8c500701 | 1563 | *resolve_oldsym = false; |
ead1e424 | 1564 | |
55a93433 ILT |
1565 | // If the caller didn't give us a version, see if we get one from |
1566 | // the version script. | |
057ead22 | 1567 | std::string v; |
8c500701 | 1568 | bool is_default_version = false; |
55a93433 ILT |
1569 | if (*pversion == NULL) |
1570 | { | |
98e090bd ILT |
1571 | bool is_global; |
1572 | if (this->version_script_.get_symbol_version(*pname, &v, &is_global)) | |
057ead22 | 1573 | { |
98e090bd ILT |
1574 | if (is_global && !v.empty()) |
1575 | { | |
1576 | *pversion = v.c_str(); | |
1577 | // If we get the version from a version script, then we | |
1578 | // are also the default version. | |
1579 | is_default_version = true; | |
1580 | } | |
057ead22 | 1581 | } |
55a93433 ILT |
1582 | } |
1583 | ||
8c500701 ILT |
1584 | Symbol* oldsym; |
1585 | Sized_symbol<size>* sym; | |
1586 | ||
1587 | bool add_to_table = false; | |
1588 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
1589 | bool add_def_to_table = false; | |
1590 | typename Symbol_table_type::iterator add_def_loc = this->table_.end(); | |
1591 | ||
ead1e424 ILT |
1592 | if (only_if_ref) |
1593 | { | |
306d9ef0 | 1594 | oldsym = this->lookup(*pname, *pversion); |
8c500701 ILT |
1595 | if (oldsym == NULL && is_default_version) |
1596 | oldsym = this->lookup(*pname, NULL); | |
f6ce93d6 | 1597 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1598 | return NULL; |
306d9ef0 ILT |
1599 | |
1600 | *pname = oldsym->name(); | |
8c500701 ILT |
1601 | if (!is_default_version) |
1602 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1603 | } |
1604 | else | |
1605 | { | |
14b31740 | 1606 | // Canonicalize NAME and VERSION. |
f0641a0b | 1607 | Stringpool::Key name_key; |
cfd73a4e | 1608 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1609 | |
14b31740 | 1610 | Stringpool::Key version_key = 0; |
306d9ef0 | 1611 | if (*pversion != NULL) |
cfd73a4e | 1612 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1613 | |
ead1e424 | 1614 | Symbol* const snull = NULL; |
ead1e424 | 1615 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1616 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1617 | version_key), | |
ead1e424 ILT |
1618 | snull)); |
1619 | ||
8781f709 | 1620 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
8c500701 ILT |
1621 | std::make_pair(this->table_.end(), false); |
1622 | if (is_default_version) | |
1623 | { | |
1624 | const Stringpool::Key vnull = 0; | |
8781f709 ILT |
1625 | insdefault = |
1626 | this->table_.insert(std::make_pair(std::make_pair(name_key, | |
1627 | vnull), | |
1628 | snull)); | |
8c500701 ILT |
1629 | } |
1630 | ||
ead1e424 ILT |
1631 | if (!ins.second) |
1632 | { | |
14b31740 | 1633 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1634 | oldsym = ins.first->second; |
a3ad94ed | 1635 | gold_assert(oldsym != NULL); |
8c500701 ILT |
1636 | |
1637 | if (is_default_version) | |
1638 | { | |
1639 | Sized_symbol<size>* soldsym = | |
1640 | this->get_sized_symbol<size>(oldsym); | |
1641 | this->define_default_version<size, big_endian>(soldsym, | |
8781f709 ILT |
1642 | insdefault.second, |
1643 | insdefault.first); | |
8c500701 | 1644 | } |
ead1e424 ILT |
1645 | } |
1646 | else | |
1647 | { | |
1648 | // We haven't seen this symbol before. | |
a3ad94ed | 1649 | gold_assert(ins.first->second == NULL); |
8c500701 ILT |
1650 | |
1651 | add_to_table = true; | |
1652 | add_loc = ins.first; | |
1653 | ||
8781f709 | 1654 | if (is_default_version && !insdefault.second) |
8c500701 ILT |
1655 | { |
1656 | // We are adding NAME/VERSION, and it is the default | |
1657 | // version. We already have an entry for NAME/NULL. | |
8781f709 | 1658 | oldsym = insdefault.first->second; |
8c500701 ILT |
1659 | *resolve_oldsym = true; |
1660 | } | |
1661 | else | |
1662 | { | |
1663 | oldsym = NULL; | |
1664 | ||
1665 | if (is_default_version) | |
1666 | { | |
1667 | add_def_to_table = true; | |
8781f709 | 1668 | add_def_loc = insdefault.first; |
8c500701 ILT |
1669 | } |
1670 | } | |
ead1e424 ILT |
1671 | } |
1672 | } | |
1673 | ||
8851ecca ILT |
1674 | const Target& target = parameters->target(); |
1675 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1676 | sym = new Sized_symbol<size>(); |
1677 | else | |
ead1e424 | 1678 | { |
029ba973 ILT |
1679 | Sized_target<size, big_endian>* sized_target = |
1680 | parameters->sized_target<size, big_endian>(); | |
86f2e683 ILT |
1681 | sym = sized_target->make_symbol(); |
1682 | if (sym == NULL) | |
1683 | return NULL; | |
1684 | } | |
ead1e424 | 1685 | |
86f2e683 ILT |
1686 | if (add_to_table) |
1687 | add_loc->second = sym; | |
1688 | else | |
1689 | gold_assert(oldsym != NULL); | |
ead1e424 | 1690 | |
8c500701 ILT |
1691 | if (add_def_to_table) |
1692 | add_def_loc->second = sym; | |
1693 | ||
7d1a9ebb | 1694 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1695 | |
1696 | return sym; | |
1697 | } | |
1698 | ||
1699 | // Define a symbol based on an Output_data. | |
1700 | ||
14b31740 | 1701 | Symbol* |
2ea97941 ILT |
1702 | Symbol_table::define_in_output_data(const char* name, |
1703 | const char* version, | |
99fff23b | 1704 | Defined defined, |
9b07f471 | 1705 | Output_data* od, |
2ea97941 ILT |
1706 | uint64_t value, |
1707 | uint64_t symsize, | |
9b07f471 ILT |
1708 | elfcpp::STT type, |
1709 | elfcpp::STB binding, | |
ead1e424 ILT |
1710 | elfcpp::STV visibility, |
1711 | unsigned char nonvis, | |
2ea97941 | 1712 | bool offset_is_from_end, |
ead1e424 ILT |
1713 | bool only_if_ref) |
1714 | { | |
8851ecca | 1715 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1716 | { |
1717 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1718 | return this->do_define_in_output_data<32>(name, version, defined, od, |
2ea97941 | 1719 | value, symsize, type, binding, |
86f2e683 | 1720 | visibility, nonvis, |
2ea97941 | 1721 | offset_is_from_end, |
86f2e683 ILT |
1722 | only_if_ref); |
1723 | #else | |
1724 | gold_unreachable(); | |
1725 | #endif | |
1726 | } | |
8851ecca | 1727 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1728 | { |
1729 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1730 | return this->do_define_in_output_data<64>(name, version, defined, od, |
2ea97941 | 1731 | value, symsize, type, binding, |
86f2e683 | 1732 | visibility, nonvis, |
2ea97941 | 1733 | offset_is_from_end, |
86f2e683 ILT |
1734 | only_if_ref); |
1735 | #else | |
1736 | gold_unreachable(); | |
1737 | #endif | |
1738 | } | |
ead1e424 | 1739 | else |
a3ad94ed | 1740 | gold_unreachable(); |
ead1e424 ILT |
1741 | } |
1742 | ||
1743 | // Define a symbol in an Output_data, sized version. | |
1744 | ||
1745 | template<int size> | |
14b31740 | 1746 | Sized_symbol<size>* |
ead1e424 | 1747 | Symbol_table::do_define_in_output_data( |
2ea97941 ILT |
1748 | const char* name, |
1749 | const char* version, | |
99fff23b | 1750 | Defined defined, |
ead1e424 | 1751 | Output_data* od, |
2ea97941 ILT |
1752 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1753 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1754 | elfcpp::STT type, |
1755 | elfcpp::STB binding, | |
1756 | elfcpp::STV visibility, | |
1757 | unsigned char nonvis, | |
2ea97941 | 1758 | bool offset_is_from_end, |
ead1e424 ILT |
1759 | bool only_if_ref) |
1760 | { | |
1761 | Sized_symbol<size>* sym; | |
86f2e683 | 1762 | Sized_symbol<size>* oldsym; |
8c500701 | 1763 | bool resolve_oldsym; |
ead1e424 | 1764 | |
8851ecca | 1765 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1766 | { |
1767 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1768 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1769 | only_if_ref, &oldsym, |
1770 | &resolve_oldsym); | |
193a53d9 ILT |
1771 | #else |
1772 | gold_unreachable(); | |
1773 | #endif | |
1774 | } | |
ead1e424 | 1775 | else |
193a53d9 ILT |
1776 | { |
1777 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1778 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1779 | only_if_ref, &oldsym, |
1780 | &resolve_oldsym); | |
193a53d9 ILT |
1781 | #else |
1782 | gold_unreachable(); | |
1783 | #endif | |
1784 | } | |
ead1e424 ILT |
1785 | |
1786 | if (sym == NULL) | |
14b31740 | 1787 | return NULL; |
ead1e424 | 1788 | |
2ea97941 ILT |
1789 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
1790 | visibility, nonvis, offset_is_from_end); | |
14b31740 | 1791 | |
e5756efb | 1792 | if (oldsym == NULL) |
55a93433 ILT |
1793 | { |
1794 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1795 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1796 | this->force_local(sym); |
2ea97941 | 1797 | else if (version != NULL) |
75517b77 | 1798 | sym->set_is_default(); |
55a93433 ILT |
1799 | return sym; |
1800 | } | |
86f2e683 | 1801 | |
99fff23b | 1802 | if (Symbol_table::should_override_with_special(oldsym, defined)) |
e5756efb | 1803 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1804 | |
1805 | if (resolve_oldsym) | |
1806 | return sym; | |
1807 | else | |
1808 | { | |
1809 | delete sym; | |
1810 | return oldsym; | |
1811 | } | |
ead1e424 ILT |
1812 | } |
1813 | ||
1814 | // Define a symbol based on an Output_segment. | |
1815 | ||
14b31740 | 1816 | Symbol* |
2ea97941 | 1817 | Symbol_table::define_in_output_segment(const char* name, |
99fff23b ILT |
1818 | const char* version, |
1819 | Defined defined, | |
1820 | Output_segment* os, | |
2ea97941 ILT |
1821 | uint64_t value, |
1822 | uint64_t symsize, | |
9b07f471 ILT |
1823 | elfcpp::STT type, |
1824 | elfcpp::STB binding, | |
ead1e424 ILT |
1825 | elfcpp::STV visibility, |
1826 | unsigned char nonvis, | |
2ea97941 | 1827 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
1828 | bool only_if_ref) |
1829 | { | |
8851ecca | 1830 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1831 | { |
1832 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1833 | return this->do_define_in_output_segment<32>(name, version, defined, os, |
2ea97941 | 1834 | value, symsize, type, |
86f2e683 | 1835 | binding, visibility, nonvis, |
2ea97941 | 1836 | offset_base, only_if_ref); |
86f2e683 ILT |
1837 | #else |
1838 | gold_unreachable(); | |
1839 | #endif | |
1840 | } | |
8851ecca | 1841 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1842 | { |
1843 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1844 | return this->do_define_in_output_segment<64>(name, version, defined, os, |
2ea97941 | 1845 | value, symsize, type, |
86f2e683 | 1846 | binding, visibility, nonvis, |
2ea97941 | 1847 | offset_base, only_if_ref); |
86f2e683 ILT |
1848 | #else |
1849 | gold_unreachable(); | |
1850 | #endif | |
1851 | } | |
ead1e424 | 1852 | else |
a3ad94ed | 1853 | gold_unreachable(); |
ead1e424 ILT |
1854 | } |
1855 | ||
1856 | // Define a symbol in an Output_segment, sized version. | |
1857 | ||
1858 | template<int size> | |
14b31740 | 1859 | Sized_symbol<size>* |
ead1e424 | 1860 | Symbol_table::do_define_in_output_segment( |
2ea97941 ILT |
1861 | const char* name, |
1862 | const char* version, | |
99fff23b | 1863 | Defined defined, |
ead1e424 | 1864 | Output_segment* os, |
2ea97941 ILT |
1865 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1866 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1867 | elfcpp::STT type, |
1868 | elfcpp::STB binding, | |
1869 | elfcpp::STV visibility, | |
1870 | unsigned char nonvis, | |
2ea97941 | 1871 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
1872 | bool only_if_ref) |
1873 | { | |
1874 | Sized_symbol<size>* sym; | |
86f2e683 | 1875 | Sized_symbol<size>* oldsym; |
8c500701 | 1876 | bool resolve_oldsym; |
ead1e424 | 1877 | |
8851ecca | 1878 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1879 | { |
1880 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1881 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1882 | only_if_ref, &oldsym, |
1883 | &resolve_oldsym); | |
9025d29d ILT |
1884 | #else |
1885 | gold_unreachable(); | |
1886 | #endif | |
1887 | } | |
ead1e424 | 1888 | else |
9025d29d ILT |
1889 | { |
1890 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1891 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1892 | only_if_ref, &oldsym, |
1893 | &resolve_oldsym); | |
9025d29d ILT |
1894 | #else |
1895 | gold_unreachable(); | |
1896 | #endif | |
1897 | } | |
ead1e424 ILT |
1898 | |
1899 | if (sym == NULL) | |
14b31740 | 1900 | return NULL; |
ead1e424 | 1901 | |
2ea97941 ILT |
1902 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
1903 | visibility, nonvis, offset_base); | |
14b31740 | 1904 | |
e5756efb | 1905 | if (oldsym == NULL) |
55a93433 ILT |
1906 | { |
1907 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1908 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1909 | this->force_local(sym); |
2ea97941 | 1910 | else if (version != NULL) |
75517b77 | 1911 | sym->set_is_default(); |
55a93433 ILT |
1912 | return sym; |
1913 | } | |
86f2e683 | 1914 | |
99fff23b | 1915 | if (Symbol_table::should_override_with_special(oldsym, defined)) |
e5756efb | 1916 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1917 | |
1918 | if (resolve_oldsym) | |
1919 | return sym; | |
1920 | else | |
1921 | { | |
1922 | delete sym; | |
1923 | return oldsym; | |
1924 | } | |
ead1e424 ILT |
1925 | } |
1926 | ||
1927 | // Define a special symbol with a constant value. It is a multiple | |
1928 | // definition error if this symbol is already defined. | |
1929 | ||
14b31740 | 1930 | Symbol* |
2ea97941 ILT |
1931 | Symbol_table::define_as_constant(const char* name, |
1932 | const char* version, | |
99fff23b | 1933 | Defined defined, |
2ea97941 ILT |
1934 | uint64_t value, |
1935 | uint64_t symsize, | |
9b07f471 ILT |
1936 | elfcpp::STT type, |
1937 | elfcpp::STB binding, | |
1938 | elfcpp::STV visibility, | |
1939 | unsigned char nonvis, | |
caa9d5d9 ILT |
1940 | bool only_if_ref, |
1941 | bool force_override) | |
ead1e424 | 1942 | { |
8851ecca | 1943 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1944 | { |
1945 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1946 | return this->do_define_as_constant<32>(name, version, defined, value, |
2ea97941 | 1947 | symsize, type, binding, |
caa9d5d9 ILT |
1948 | visibility, nonvis, only_if_ref, |
1949 | force_override); | |
86f2e683 ILT |
1950 | #else |
1951 | gold_unreachable(); | |
1952 | #endif | |
1953 | } | |
8851ecca | 1954 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1955 | { |
1956 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1957 | return this->do_define_as_constant<64>(name, version, defined, value, |
2ea97941 | 1958 | symsize, type, binding, |
caa9d5d9 ILT |
1959 | visibility, nonvis, only_if_ref, |
1960 | force_override); | |
86f2e683 ILT |
1961 | #else |
1962 | gold_unreachable(); | |
1963 | #endif | |
1964 | } | |
ead1e424 | 1965 | else |
a3ad94ed | 1966 | gold_unreachable(); |
ead1e424 ILT |
1967 | } |
1968 | ||
1969 | // Define a symbol as a constant, sized version. | |
1970 | ||
1971 | template<int size> | |
14b31740 | 1972 | Sized_symbol<size>* |
ead1e424 | 1973 | Symbol_table::do_define_as_constant( |
2ea97941 ILT |
1974 | const char* name, |
1975 | const char* version, | |
99fff23b | 1976 | Defined defined, |
2ea97941 ILT |
1977 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1978 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1979 | elfcpp::STT type, |
1980 | elfcpp::STB binding, | |
1981 | elfcpp::STV visibility, | |
1982 | unsigned char nonvis, | |
caa9d5d9 ILT |
1983 | bool only_if_ref, |
1984 | bool force_override) | |
ead1e424 ILT |
1985 | { |
1986 | Sized_symbol<size>* sym; | |
86f2e683 | 1987 | Sized_symbol<size>* oldsym; |
8c500701 | 1988 | bool resolve_oldsym; |
ead1e424 | 1989 | |
8851ecca | 1990 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1991 | { |
1992 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1993 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1994 | only_if_ref, &oldsym, |
1995 | &resolve_oldsym); | |
9025d29d ILT |
1996 | #else |
1997 | gold_unreachable(); | |
1998 | #endif | |
1999 | } | |
ead1e424 | 2000 | else |
9025d29d ILT |
2001 | { |
2002 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2003 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2004 | only_if_ref, &oldsym, |
2005 | &resolve_oldsym); | |
9025d29d ILT |
2006 | #else |
2007 | gold_unreachable(); | |
2008 | #endif | |
2009 | } | |
ead1e424 ILT |
2010 | |
2011 | if (sym == NULL) | |
14b31740 | 2012 | return NULL; |
ead1e424 | 2013 | |
2ea97941 | 2014 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
75517b77 | 2015 | nonvis); |
14b31740 | 2016 | |
e5756efb | 2017 | if (oldsym == NULL) |
55a93433 | 2018 | { |
686c8caf ILT |
2019 | // Version symbols are absolute symbols with name == version. |
2020 | // We don't want to force them to be local. | |
2ea97941 ILT |
2021 | if ((version == NULL |
2022 | || name != version | |
2023 | || value != 0) | |
686c8caf | 2024 | && (binding == elfcpp::STB_LOCAL |
2ea97941 | 2025 | || this->version_script_.symbol_is_local(name))) |
55a93433 | 2026 | this->force_local(sym); |
2ea97941 ILT |
2027 | else if (version != NULL |
2028 | && (name != version || value != 0)) | |
75517b77 | 2029 | sym->set_is_default(); |
55a93433 ILT |
2030 | return sym; |
2031 | } | |
86f2e683 | 2032 | |
99fff23b ILT |
2033 | if (force_override |
2034 | || Symbol_table::should_override_with_special(oldsym, defined)) | |
e5756efb | 2035 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2036 | |
2037 | if (resolve_oldsym) | |
2038 | return sym; | |
2039 | else | |
2040 | { | |
2041 | delete sym; | |
2042 | return oldsym; | |
2043 | } | |
ead1e424 ILT |
2044 | } |
2045 | ||
2046 | // Define a set of symbols in output sections. | |
2047 | ||
2048 | void | |
9b07f471 | 2049 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2050 | const Define_symbol_in_section* p, |
2051 | bool only_if_ref) | |
ead1e424 ILT |
2052 | { |
2053 | for (int i = 0; i < count; ++i, ++p) | |
2054 | { | |
2055 | Output_section* os = layout->find_output_section(p->output_section); | |
2056 | if (os != NULL) | |
99fff23b | 2057 | this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2058 | p->size, p->type, p->binding, |
2059 | p->visibility, p->nonvis, | |
a445fddf ILT |
2060 | p->offset_is_from_end, |
2061 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2062 | else |
99fff23b ILT |
2063 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2064 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2065 | only_if_ref || p->only_if_ref, |
2066 | false); | |
ead1e424 ILT |
2067 | } |
2068 | } | |
2069 | ||
2070 | // Define a set of symbols in output segments. | |
2071 | ||
2072 | void | |
9b07f471 | 2073 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2074 | const Define_symbol_in_segment* p, |
2075 | bool only_if_ref) | |
ead1e424 ILT |
2076 | { |
2077 | for (int i = 0; i < count; ++i, ++p) | |
2078 | { | |
2079 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
2080 | p->segment_flags_set, | |
2081 | p->segment_flags_clear); | |
2082 | if (os != NULL) | |
99fff23b | 2083 | this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2084 | p->size, p->type, p->binding, |
2085 | p->visibility, p->nonvis, | |
a445fddf ILT |
2086 | p->offset_base, |
2087 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2088 | else |
99fff23b ILT |
2089 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2090 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2091 | only_if_ref || p->only_if_ref, |
2092 | false); | |
ead1e424 ILT |
2093 | } |
2094 | } | |
2095 | ||
46fe1623 ILT |
2096 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
2097 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
2098 | // the offset within POSD. | |
2099 | ||
2100 | template<int size> | |
2101 | void | |
fe8718a4 | 2102 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
2103 | Sized_symbol<size>* csym, |
2104 | Output_data* posd, | |
2ea97941 | 2105 | typename elfcpp::Elf_types<size>::Elf_Addr value) |
46fe1623 ILT |
2106 | { |
2107 | gold_assert(csym->is_from_dynobj()); | |
2108 | gold_assert(!csym->is_copied_from_dynobj()); | |
2ea97941 ILT |
2109 | Object* object = csym->object(); |
2110 | gold_assert(object->is_dynamic()); | |
2111 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
46fe1623 ILT |
2112 | |
2113 | // Our copied variable has to override any variable in a shared | |
2114 | // library. | |
2115 | elfcpp::STB binding = csym->binding(); | |
2116 | if (binding == elfcpp::STB_WEAK) | |
2117 | binding = elfcpp::STB_GLOBAL; | |
2118 | ||
99fff23b | 2119 | this->define_in_output_data(csym->name(), csym->version(), COPY, |
2ea97941 | 2120 | posd, value, csym->symsize(), |
46fe1623 ILT |
2121 | csym->type(), binding, |
2122 | csym->visibility(), csym->nonvis(), | |
2123 | false, false); | |
2124 | ||
2125 | csym->set_is_copied_from_dynobj(); | |
2126 | csym->set_needs_dynsym_entry(); | |
2127 | ||
2128 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
2129 | ||
2130 | // We have now defined all aliases, but we have not entered them all | |
2131 | // in the copied_symbol_dynobjs_ map. | |
2132 | if (csym->has_alias()) | |
2133 | { | |
2134 | Symbol* sym = csym; | |
2135 | while (true) | |
2136 | { | |
2137 | sym = this->weak_aliases_[sym]; | |
2138 | if (sym == csym) | |
2139 | break; | |
2140 | gold_assert(sym->output_data() == posd); | |
2141 | ||
2142 | sym->set_is_copied_from_dynobj(); | |
2143 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
2144 | } | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
2149 | // the original definition was found. | |
2150 | ||
2151 | Dynobj* | |
2152 | Symbol_table::get_copy_source(const Symbol* sym) const | |
2153 | { | |
2154 | gold_assert(sym->is_copied_from_dynobj()); | |
2155 | Copied_symbol_dynobjs::const_iterator p = | |
2156 | this->copied_symbol_dynobjs_.find(sym); | |
2157 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
2158 | return p->second; | |
2159 | } | |
2160 | ||
f3e9c5c5 ILT |
2161 | // Add any undefined symbols named on the command line. |
2162 | ||
2163 | void | |
2164 | Symbol_table::add_undefined_symbols_from_command_line() | |
2165 | { | |
2166 | if (parameters->options().any_undefined()) | |
2167 | { | |
2168 | if (parameters->target().get_size() == 32) | |
2169 | { | |
5adf9721 | 2170 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
f3e9c5c5 ILT |
2171 | this->do_add_undefined_symbols_from_command_line<32>(); |
2172 | #else | |
2173 | gold_unreachable(); | |
2174 | #endif | |
2175 | } | |
2176 | else if (parameters->target().get_size() == 64) | |
2177 | { | |
2178 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2179 | this->do_add_undefined_symbols_from_command_line<64>(); | |
2180 | #else | |
2181 | gold_unreachable(); | |
2182 | #endif | |
2183 | } | |
2184 | else | |
2185 | gold_unreachable(); | |
2186 | } | |
2187 | } | |
2188 | ||
2189 | template<int size> | |
2190 | void | |
2191 | Symbol_table::do_add_undefined_symbols_from_command_line() | |
2192 | { | |
2193 | for (options::String_set::const_iterator p = | |
2194 | parameters->options().undefined_begin(); | |
2195 | p != parameters->options().undefined_end(); | |
2196 | ++p) | |
2197 | { | |
2ea97941 | 2198 | const char* name = p->c_str(); |
f3e9c5c5 | 2199 | |
2ea97941 | 2200 | if (this->lookup(name) != NULL) |
f3e9c5c5 ILT |
2201 | continue; |
2202 | ||
2ea97941 | 2203 | const char* version = NULL; |
f3e9c5c5 ILT |
2204 | |
2205 | Sized_symbol<size>* sym; | |
2206 | Sized_symbol<size>* oldsym; | |
8c500701 | 2207 | bool resolve_oldsym; |
f3e9c5c5 ILT |
2208 | if (parameters->target().is_big_endian()) |
2209 | { | |
2210 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2211 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2212 | false, &oldsym, |
2213 | &resolve_oldsym); | |
f3e9c5c5 ILT |
2214 | #else |
2215 | gold_unreachable(); | |
2216 | #endif | |
2217 | } | |
2218 | else | |
2219 | { | |
2220 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2221 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2222 | false, &oldsym, |
2223 | &resolve_oldsym); | |
f3e9c5c5 ILT |
2224 | #else |
2225 | gold_unreachable(); | |
2226 | #endif | |
2227 | } | |
2228 | ||
2229 | gold_assert(oldsym == NULL); | |
2230 | ||
2ea97941 | 2231 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
f3e9c5c5 ILT |
2232 | elfcpp::STV_DEFAULT, 0); |
2233 | ++this->saw_undefined_; | |
2234 | } | |
2235 | } | |
2236 | ||
a3ad94ed ILT |
2237 | // Set the dynamic symbol indexes. INDEX is the index of the first |
2238 | // global dynamic symbol. Pointers to the symbols are stored into the | |
2239 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
2240 | // updated dynamic symbol index. | |
2241 | ||
2242 | unsigned int | |
9b07f471 | 2243 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 2244 | std::vector<Symbol*>* syms, |
14b31740 ILT |
2245 | Stringpool* dynpool, |
2246 | Versions* versions) | |
a3ad94ed ILT |
2247 | { |
2248 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
2249 | p != this->table_.end(); | |
2250 | ++p) | |
2251 | { | |
2252 | Symbol* sym = p->second; | |
16649710 ILT |
2253 | |
2254 | // Note that SYM may already have a dynamic symbol index, since | |
2255 | // some symbols appear more than once in the symbol table, with | |
2256 | // and without a version. | |
2257 | ||
ce97fa81 | 2258 | if (!sym->should_add_dynsym_entry(this)) |
16649710 ILT |
2259 | sym->set_dynsym_index(-1U); |
2260 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
2261 | { |
2262 | sym->set_dynsym_index(index); | |
2263 | ++index; | |
2264 | syms->push_back(sym); | |
cfd73a4e | 2265 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
2266 | |
2267 | // Record any version information. | |
09124467 ILT |
2268 | if (sym->version() != NULL) |
2269 | versions->record_version(this, dynpool, sym); | |
594c8e5e ILT |
2270 | |
2271 | // If the symbol is defined in a dynamic object and is | |
2272 | // referenced in a regular object, then mark the dynamic | |
2273 | // object as needed. This is used to implement --as-needed. | |
2274 | if (sym->is_from_dynobj() && sym->in_reg()) | |
2275 | sym->object()->set_is_needed(); | |
a3ad94ed ILT |
2276 | } |
2277 | } | |
2278 | ||
14b31740 ILT |
2279 | // Finish up the versions. In some cases this may add new dynamic |
2280 | // symbols. | |
9b07f471 | 2281 | index = versions->finalize(this, index, syms); |
14b31740 | 2282 | |
a3ad94ed ILT |
2283 | return index; |
2284 | } | |
2285 | ||
c06b7b0b | 2286 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
2287 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
2288 | // file offset OFF. Add their names to POOL. Return the new file | |
2289 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 2290 | |
75f65a3e | 2291 | off_t |
55a93433 ILT |
2292 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
2293 | size_t dyncount, Stringpool* pool, | |
2294 | unsigned int *plocal_symcount) | |
54dc6425 | 2295 | { |
f6ce93d6 ILT |
2296 | off_t ret; |
2297 | ||
55a93433 ILT |
2298 | gold_assert(*plocal_symcount != 0); |
2299 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 2300 | |
16649710 ILT |
2301 | this->dynamic_offset_ = dynoff; |
2302 | this->first_dynamic_global_index_ = dyn_global_index; | |
2303 | this->dynamic_count_ = dyncount; | |
2304 | ||
8851ecca | 2305 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
2306 | { |
2307 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 2308 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
2309 | #else |
2310 | gold_unreachable(); | |
2311 | #endif | |
2312 | } | |
8851ecca | 2313 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
2314 | { |
2315 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 2316 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
2317 | #else |
2318 | gold_unreachable(); | |
2319 | #endif | |
2320 | } | |
61ba1cf9 | 2321 | else |
a3ad94ed | 2322 | gold_unreachable(); |
f6ce93d6 ILT |
2323 | |
2324 | // Now that we have the final symbol table, we can reliably note | |
2325 | // which symbols should get warnings. | |
cb295612 | 2326 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2327 | |
2328 | return ret; | |
75f65a3e ILT |
2329 | } |
2330 | ||
55a93433 ILT |
2331 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2332 | // POOL, update *PINDEX and *POFF. | |
2333 | ||
2334 | template<int size> | |
2335 | void | |
2336 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2337 | unsigned int* pindex, off_t* poff) | |
2338 | { | |
2339 | sym->set_symtab_index(*pindex); | |
2340 | pool->add(sym->name(), false, NULL); | |
2341 | ++*pindex; | |
2342 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2343 | } | |
2344 | ||
ead1e424 ILT |
2345 | // Set the final value for all the symbols. This is called after |
2346 | // Layout::finalize, so all the output sections have their final | |
2347 | // address. | |
75f65a3e ILT |
2348 | |
2349 | template<int size> | |
2350 | off_t | |
55a93433 ILT |
2351 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2352 | unsigned int* plocal_symcount) | |
75f65a3e | 2353 | { |
ead1e424 | 2354 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2355 | this->offset_ = off; |
2356 | ||
55a93433 ILT |
2357 | unsigned int index = *plocal_symcount; |
2358 | const unsigned int orig_index = index; | |
c06b7b0b | 2359 | |
55a93433 ILT |
2360 | // First do all the symbols which have been forced to be local, as |
2361 | // they must appear before all global symbols. | |
2362 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2363 | p != this->forced_locals_.end(); | |
2364 | ++p) | |
2365 | { | |
2366 | Symbol* sym = *p; | |
2367 | gold_assert(sym->is_forced_local()); | |
2368 | if (this->sized_finalize_symbol<size>(sym)) | |
2369 | { | |
2370 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2371 | ++*plocal_symcount; | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2376 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2377 | p != this->table_.end(); | |
2378 | ++p) | |
54dc6425 | 2379 | { |
55a93433 ILT |
2380 | Symbol* sym = p->second; |
2381 | if (this->sized_finalize_symbol<size>(sym)) | |
2382 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2383 | } | |
54dc6425 | 2384 | |
55a93433 | 2385 | this->output_count_ = index - orig_index; |
a3ad94ed | 2386 | |
55a93433 ILT |
2387 | return off; |
2388 | } | |
75f65a3e | 2389 | |
c0a62865 DK |
2390 | // Compute the final value of SYM and store status in location PSTATUS. |
2391 | // During relaxation, this may be called multiple times for a symbol to | |
2392 | // compute its would-be final value in each relaxation pass. | |
008db82e | 2393 | |
55a93433 | 2394 | template<int size> |
c0a62865 DK |
2395 | typename Sized_symbol<size>::Value_type |
2396 | Symbol_table::compute_final_value( | |
2397 | const Sized_symbol<size>* sym, | |
2398 | Compute_final_value_status* pstatus) const | |
55a93433 | 2399 | { |
ef9beddf | 2400 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2ea97941 | 2401 | Value_type value; |
ead1e424 | 2402 | |
55a93433 ILT |
2403 | switch (sym->source()) |
2404 | { | |
2405 | case Symbol::FROM_OBJECT: | |
2406 | { | |
d491d34e | 2407 | bool is_ordinary; |
2ea97941 | 2408 | unsigned int shndx = sym->shndx(&is_ordinary); |
ead1e424 | 2409 | |
d491d34e | 2410 | if (!is_ordinary |
2ea97941 ILT |
2411 | && shndx != elfcpp::SHN_ABS |
2412 | && !Symbol::is_common_shndx(shndx)) | |
55a93433 | 2413 | { |
c0a62865 DK |
2414 | *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION; |
2415 | return 0; | |
ead1e424 | 2416 | } |
ead1e424 | 2417 | |
55a93433 ILT |
2418 | Object* symobj = sym->object(); |
2419 | if (symobj->is_dynamic()) | |
ead1e424 | 2420 | { |
2ea97941 ILT |
2421 | value = 0; |
2422 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2423 | } |
89fc3421 CC |
2424 | else if (symobj->pluginobj() != NULL) |
2425 | { | |
2ea97941 ILT |
2426 | value = 0; |
2427 | shndx = elfcpp::SHN_UNDEF; | |
89fc3421 | 2428 | } |
2ea97941 ILT |
2429 | else if (shndx == elfcpp::SHN_UNDEF) |
2430 | value = 0; | |
d491d34e | 2431 | else if (!is_ordinary |
2ea97941 ILT |
2432 | && (shndx == elfcpp::SHN_ABS |
2433 | || Symbol::is_common_shndx(shndx))) | |
2434 | value = sym->value(); | |
55a93433 | 2435 | else |
ead1e424 | 2436 | { |
55a93433 | 2437 | Relobj* relobj = static_cast<Relobj*>(symobj); |
2ea97941 | 2438 | Output_section* os = relobj->output_section(shndx); |
55a93433 | 2439 | |
2ea97941 | 2440 | if (this->is_section_folded(relobj, shndx)) |
ef15dade ST |
2441 | { |
2442 | gold_assert(os == NULL); | |
2443 | // Get the os of the section it is folded onto. | |
2444 | Section_id folded = this->icf_->get_folded_section(relobj, | |
2ea97941 | 2445 | shndx); |
ef15dade ST |
2446 | gold_assert(folded.first != NULL); |
2447 | Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first); | |
d6344fb5 DK |
2448 | unsigned folded_shndx = folded.second; |
2449 | ||
2450 | os = folded_obj->output_section(folded_shndx); | |
ef15dade | 2451 | gold_assert(os != NULL); |
d6344fb5 DK |
2452 | |
2453 | // Replace (relobj, shndx) with canonical ICF input section. | |
2454 | shndx = folded_shndx; | |
2455 | relobj = folded_obj; | |
ef15dade ST |
2456 | } |
2457 | ||
d6344fb5 | 2458 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
ef15dade | 2459 | if (os == NULL) |
ead1e424 | 2460 | { |
6d03d481 ST |
2461 | bool static_or_reloc = (parameters->doing_static_link() || |
2462 | parameters->options().relocatable()); | |
2463 | gold_assert(static_or_reloc || sym->dynsym_index() == -1U); | |
2464 | ||
c0a62865 DK |
2465 | *pstatus = CFVS_NO_OUTPUT_SECTION; |
2466 | return 0; | |
ead1e424 | 2467 | } |
55a93433 | 2468 | |
eff45813 CC |
2469 | if (secoff64 == -1ULL) |
2470 | { | |
2471 | // The section needs special handling (e.g., a merge section). | |
ef15dade | 2472 | |
2ea97941 | 2473 | value = os->output_address(relobj, shndx, sym->value()); |
eff45813 CC |
2474 | } |
2475 | else | |
2476 | { | |
2477 | Value_type secoff = | |
2478 | convert_types<Value_type, uint64_t>(secoff64); | |
2479 | if (sym->type() == elfcpp::STT_TLS) | |
2ea97941 | 2480 | value = sym->value() + os->tls_offset() + secoff; |
eff45813 | 2481 | else |
2ea97941 | 2482 | value = sym->value() + os->address() + secoff; |
eff45813 | 2483 | } |
ead1e424 | 2484 | } |
55a93433 ILT |
2485 | } |
2486 | break; | |
2487 | ||
2488 | case Symbol::IN_OUTPUT_DATA: | |
2489 | { | |
2490 | Output_data* od = sym->output_data(); | |
2ea97941 | 2491 | value = sym->value(); |
155a0dd7 | 2492 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2493 | value += od->address(); |
155a0dd7 ILT |
2494 | else |
2495 | { | |
2496 | Output_section* os = od->output_section(); | |
2497 | gold_assert(os != NULL); | |
2ea97941 | 2498 | value += os->tls_offset() + (od->address() - os->address()); |
155a0dd7 | 2499 | } |
55a93433 | 2500 | if (sym->offset_is_from_end()) |
2ea97941 | 2501 | value += od->data_size(); |
55a93433 ILT |
2502 | } |
2503 | break; | |
2504 | ||
2505 | case Symbol::IN_OUTPUT_SEGMENT: | |
2506 | { | |
2507 | Output_segment* os = sym->output_segment(); | |
2ea97941 | 2508 | value = sym->value(); |
edfbb029 | 2509 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2510 | value += os->vaddr(); |
55a93433 ILT |
2511 | switch (sym->offset_base()) |
2512 | { | |
2513 | case Symbol::SEGMENT_START: | |
2514 | break; | |
2515 | case Symbol::SEGMENT_END: | |
2ea97941 | 2516 | value += os->memsz(); |
55a93433 ILT |
2517 | break; |
2518 | case Symbol::SEGMENT_BSS: | |
2ea97941 | 2519 | value += os->filesz(); |
55a93433 ILT |
2520 | break; |
2521 | default: | |
2522 | gold_unreachable(); | |
2523 | } | |
2524 | } | |
2525 | break; | |
ead1e424 | 2526 | |
f3e9c5c5 | 2527 | case Symbol::IS_CONSTANT: |
2ea97941 | 2528 | value = sym->value(); |
55a93433 | 2529 | break; |
ead1e424 | 2530 | |
f3e9c5c5 | 2531 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2532 | value = 0; |
f3e9c5c5 ILT |
2533 | break; |
2534 | ||
55a93433 ILT |
2535 | default: |
2536 | gold_unreachable(); | |
2537 | } | |
ead1e424 | 2538 | |
c0a62865 | 2539 | *pstatus = CFVS_OK; |
2ea97941 | 2540 | return value; |
c0a62865 DK |
2541 | } |
2542 | ||
2543 | // Finalize the symbol SYM. This returns true if the symbol should be | |
2544 | // added to the symbol table, false otherwise. | |
2545 | ||
2546 | template<int size> | |
2547 | bool | |
2548 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2549 | { | |
2550 | typedef typename Sized_symbol<size>::Value_type Value_type; | |
2551 | ||
2552 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
2553 | ||
2554 | // The default version of a symbol may appear twice in the symbol | |
2555 | // table. We only need to finalize it once. | |
2556 | if (sym->has_symtab_index()) | |
2557 | return false; | |
2558 | ||
2559 | if (!sym->in_reg()) | |
2560 | { | |
2561 | gold_assert(!sym->has_symtab_index()); | |
2562 | sym->set_symtab_index(-1U); | |
2563 | gold_assert(sym->dynsym_index() == -1U); | |
2564 | return false; | |
2565 | } | |
2566 | ||
2567 | // Compute final symbol value. | |
2568 | Compute_final_value_status status; | |
2ea97941 | 2569 | Value_type value = this->compute_final_value(sym, &status); |
c0a62865 DK |
2570 | |
2571 | switch (status) | |
2572 | { | |
2573 | case CFVS_OK: | |
2574 | break; | |
2575 | case CFVS_UNSUPPORTED_SYMBOL_SECTION: | |
2576 | { | |
2577 | bool is_ordinary; | |
2ea97941 | 2578 | unsigned int shndx = sym->shndx(&is_ordinary); |
c0a62865 | 2579 | gold_error(_("%s: unsupported symbol section 0x%x"), |
2ea97941 | 2580 | sym->demangled_name().c_str(), shndx); |
c0a62865 DK |
2581 | } |
2582 | break; | |
2583 | case CFVS_NO_OUTPUT_SECTION: | |
2584 | sym->set_symtab_index(-1U); | |
2585 | return false; | |
2586 | default: | |
2587 | gold_unreachable(); | |
2588 | } | |
2589 | ||
2ea97941 | 2590 | sym->set_value(value); |
9e2dcb77 | 2591 | |
8c604651 CS |
2592 | if (parameters->options().strip_all() |
2593 | || !parameters->options().should_retain_symbol(sym->name())) | |
55a93433 ILT |
2594 | { |
2595 | sym->set_symtab_index(-1U); | |
2596 | return false; | |
54dc6425 | 2597 | } |
75f65a3e | 2598 | |
55a93433 | 2599 | return true; |
54dc6425 ILT |
2600 | } |
2601 | ||
61ba1cf9 ILT |
2602 | // Write out the global symbols. |
2603 | ||
2604 | void | |
fd9d194f | 2605 | Symbol_table::write_globals(const Stringpool* sympool, |
d491d34e ILT |
2606 | const Stringpool* dynpool, |
2607 | Output_symtab_xindex* symtab_xindex, | |
2608 | Output_symtab_xindex* dynsym_xindex, | |
2609 | Output_file* of) const | |
61ba1cf9 | 2610 | { |
8851ecca | 2611 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2612 | { |
9025d29d | 2613 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2614 | case Parameters::TARGET_32_LITTLE: |
fd9d194f | 2615 | this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2616 | dynsym_xindex, of); |
8851ecca | 2617 | break; |
9025d29d | 2618 | #endif |
8851ecca ILT |
2619 | #ifdef HAVE_TARGET_32_BIG |
2620 | case Parameters::TARGET_32_BIG: | |
fd9d194f | 2621 | this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2622 | dynsym_xindex, of); |
8851ecca | 2623 | break; |
9025d29d | 2624 | #endif |
9025d29d | 2625 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2626 | case Parameters::TARGET_64_LITTLE: |
fd9d194f | 2627 | this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2628 | dynsym_xindex, of); |
8851ecca | 2629 | break; |
9025d29d | 2630 | #endif |
8851ecca ILT |
2631 | #ifdef HAVE_TARGET_64_BIG |
2632 | case Parameters::TARGET_64_BIG: | |
fd9d194f | 2633 | this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2634 | dynsym_xindex, of); |
8851ecca ILT |
2635 | break; |
2636 | #endif | |
2637 | default: | |
2638 | gold_unreachable(); | |
61ba1cf9 | 2639 | } |
61ba1cf9 ILT |
2640 | } |
2641 | ||
2642 | // Write out the global symbols. | |
2643 | ||
2644 | template<int size, bool big_endian> | |
2645 | void | |
fd9d194f | 2646 | Symbol_table::sized_write_globals(const Stringpool* sympool, |
16649710 | 2647 | const Stringpool* dynpool, |
d491d34e ILT |
2648 | Output_symtab_xindex* symtab_xindex, |
2649 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2650 | Output_file* of) const |
2651 | { | |
8851ecca | 2652 | const Target& target = parameters->target(); |
9a2d6984 | 2653 | |
61ba1cf9 | 2654 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2655 | |
2656 | const unsigned int output_count = this->output_count_; | |
2657 | const section_size_type oview_size = output_count * sym_size; | |
2658 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2659 | unsigned char* psyms; |
2660 | if (this->offset_ == 0 || output_count == 0) | |
2661 | psyms = NULL; | |
2662 | else | |
2663 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2664 | |
55a93433 ILT |
2665 | const unsigned int dynamic_count = this->dynamic_count_; |
2666 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2667 | const unsigned int first_dynamic_global_index = | |
2668 | this->first_dynamic_global_index_; | |
16649710 | 2669 | unsigned char* dynamic_view; |
5fe2a0f5 | 2670 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2671 | dynamic_view = NULL; |
2672 | else | |
2673 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2674 | |
61ba1cf9 ILT |
2675 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2676 | p != this->table_.end(); | |
2677 | ++p) | |
2678 | { | |
2679 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2680 | ||
9a2d6984 | 2681 | // Possibly warn about unresolved symbols in shared libraries. |
fd9d194f | 2682 | this->warn_about_undefined_dynobj_symbol(sym); |
e2827e5f | 2683 | |
a3ad94ed | 2684 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2685 | unsigned int dynsym_index; |
2686 | if (dynamic_view == NULL) | |
2687 | dynsym_index = -1U; | |
2688 | else | |
2689 | dynsym_index = sym->dynsym_index(); | |
2690 | ||
2691 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2692 | { |
2693 | // This symbol is not included in the output file. | |
2694 | continue; | |
2695 | } | |
16649710 | 2696 | |
2ea97941 | 2697 | unsigned int shndx; |
88dd47ac ILT |
2698 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2699 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ead1e424 ILT |
2700 | switch (sym->source()) |
2701 | { | |
2702 | case Symbol::FROM_OBJECT: | |
2703 | { | |
d491d34e ILT |
2704 | bool is_ordinary; |
2705 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2706 | |
d491d34e | 2707 | if (!is_ordinary |
0dfbdef4 | 2708 | && in_shndx != elfcpp::SHN_ABS |
8a5e3e08 | 2709 | && !Symbol::is_common_shndx(in_shndx)) |
ead1e424 | 2710 | { |
75f2446e | 2711 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2712 | sym->demangled_name().c_str(), in_shndx); |
2ea97941 | 2713 | shndx = in_shndx; |
f6ce93d6 | 2714 | } |
ead1e424 ILT |
2715 | else |
2716 | { | |
75f2446e ILT |
2717 | Object* symobj = sym->object(); |
2718 | if (symobj->is_dynamic()) | |
2719 | { | |
2720 | if (sym->needs_dynsym_value()) | |
8851ecca | 2721 | dynsym_value = target.dynsym_value(sym); |
2ea97941 | 2722 | shndx = elfcpp::SHN_UNDEF; |
75f2446e | 2723 | } |
89fc3421 | 2724 | else if (symobj->pluginobj() != NULL) |
2ea97941 | 2725 | shndx = elfcpp::SHN_UNDEF; |
75f2446e | 2726 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
2727 | || (!is_ordinary |
2728 | && (in_shndx == elfcpp::SHN_ABS | |
8a5e3e08 | 2729 | || Symbol::is_common_shndx(in_shndx)))) |
2ea97941 | 2730 | shndx = in_shndx; |
75f2446e ILT |
2731 | else |
2732 | { | |
2733 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 2734 | Output_section* os = relobj->output_section(in_shndx); |
ef15dade ST |
2735 | if (this->is_section_folded(relobj, in_shndx)) |
2736 | { | |
2737 | // This global symbol must be written out even though | |
2738 | // it is folded. | |
2739 | // Get the os of the section it is folded onto. | |
2740 | Section_id folded = | |
2741 | this->icf_->get_folded_section(relobj, in_shndx); | |
2742 | gold_assert(folded.first !=NULL); | |
2743 | Relobj* folded_obj = | |
2744 | reinterpret_cast<Relobj*>(folded.first); | |
2745 | os = folded_obj->output_section(folded.second); | |
2746 | gold_assert(os != NULL); | |
2747 | } | |
75f2446e | 2748 | gold_assert(os != NULL); |
2ea97941 | 2749 | shndx = os->out_shndx(); |
88dd47ac | 2750 | |
2ea97941 | 2751 | if (shndx >= elfcpp::SHN_LORESERVE) |
d491d34e ILT |
2752 | { |
2753 | if (sym_index != -1U) | |
2ea97941 | 2754 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 2755 | if (dynsym_index != -1U) |
2ea97941 ILT |
2756 | dynsym_xindex->add(dynsym_index, shndx); |
2757 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e ILT |
2758 | } |
2759 | ||
88dd47ac ILT |
2760 | // In object files symbol values are section |
2761 | // relative. | |
8851ecca | 2762 | if (parameters->options().relocatable()) |
88dd47ac | 2763 | sym_value -= os->address(); |
75f2446e | 2764 | } |
ead1e424 ILT |
2765 | } |
2766 | } | |
2767 | break; | |
2768 | ||
2769 | case Symbol::IN_OUTPUT_DATA: | |
2ea97941 ILT |
2770 | shndx = sym->output_data()->out_shndx(); |
2771 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e ILT |
2772 | { |
2773 | if (sym_index != -1U) | |
2ea97941 | 2774 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 2775 | if (dynsym_index != -1U) |
2ea97941 ILT |
2776 | dynsym_xindex->add(dynsym_index, shndx); |
2777 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 2778 | } |
ead1e424 ILT |
2779 | break; |
2780 | ||
2781 | case Symbol::IN_OUTPUT_SEGMENT: | |
2ea97941 | 2782 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
2783 | break; |
2784 | ||
f3e9c5c5 | 2785 | case Symbol::IS_CONSTANT: |
2ea97941 | 2786 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
2787 | break; |
2788 | ||
f3e9c5c5 | 2789 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2790 | shndx = elfcpp::SHN_UNDEF; |
f3e9c5c5 ILT |
2791 | break; |
2792 | ||
ead1e424 | 2793 | default: |
a3ad94ed | 2794 | gold_unreachable(); |
ead1e424 | 2795 | } |
61ba1cf9 | 2796 | |
16649710 ILT |
2797 | if (sym_index != -1U) |
2798 | { | |
55a93433 ILT |
2799 | sym_index -= first_global_index; |
2800 | gold_assert(sym_index < output_count); | |
2801 | unsigned char* ps = psyms + (sym_index * sym_size); | |
2ea97941 | 2802 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
7d1a9ebb | 2803 | sympool, ps); |
16649710 | 2804 | } |
61ba1cf9 | 2805 | |
16649710 ILT |
2806 | if (dynsym_index != -1U) |
2807 | { | |
2808 | dynsym_index -= first_dynamic_global_index; | |
2809 | gold_assert(dynsym_index < dynamic_count); | |
2810 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
2ea97941 | 2811 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
7d1a9ebb | 2812 | dynpool, pd); |
16649710 | 2813 | } |
61ba1cf9 ILT |
2814 | } |
2815 | ||
c06b7b0b | 2816 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
2817 | if (dynamic_view != NULL) |
2818 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
2819 | } | |
2820 | ||
2821 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
2822 | // strtab holding the name. | |
2823 | ||
2824 | template<int size, bool big_endian> | |
2825 | void | |
ab5c9e90 ILT |
2826 | Symbol_table::sized_write_symbol( |
2827 | Sized_symbol<size>* sym, | |
2ea97941 ILT |
2828 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2829 | unsigned int shndx, | |
ab5c9e90 | 2830 | const Stringpool* pool, |
7d1a9ebb | 2831 | unsigned char* p) const |
16649710 ILT |
2832 | { |
2833 | elfcpp::Sym_write<size, big_endian> osym(p); | |
2834 | osym.put_st_name(pool->get_offset(sym->name())); | |
2ea97941 | 2835 | osym.put_st_value(value); |
58e54ac2 | 2836 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2ea97941 | 2837 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) |
58e54ac2 CD |
2838 | osym.put_st_size(0); |
2839 | else | |
2840 | osym.put_st_size(sym->symsize()); | |
53d7974c L |
2841 | elfcpp::STT type = sym->type(); |
2842 | // Turn IFUNC symbols from shared libraries into normal FUNC symbols. | |
2843 | if (type == elfcpp::STT_GNU_IFUNC | |
2844 | && sym->is_from_dynobj()) | |
2845 | type = elfcpp::STT_FUNC; | |
55a93433 ILT |
2846 | // A version script may have overridden the default binding. |
2847 | if (sym->is_forced_local()) | |
53d7974c | 2848 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type)); |
55a93433 | 2849 | else |
53d7974c | 2850 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), type)); |
16649710 | 2851 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2ea97941 | 2852 | osym.put_st_shndx(shndx); |
61ba1cf9 ILT |
2853 | } |
2854 | ||
9a2d6984 ILT |
2855 | // Check for unresolved symbols in shared libraries. This is |
2856 | // controlled by the --allow-shlib-undefined option. | |
2857 | ||
2858 | // We only warn about libraries for which we have seen all the | |
2859 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2860 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2861 | // entry, we aren't going to be able to reliably report whether the | |
2862 | // symbol is undefined. | |
2863 | ||
fd9d194f ILT |
2864 | // We also don't warn about libraries found in a system library |
2865 | // directory (e.g., /lib or /usr/lib); we assume that those libraries | |
2866 | // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl | |
2867 | // can have undefined references satisfied by ld-linux.so. | |
9a2d6984 ILT |
2868 | |
2869 | inline void | |
fd9d194f | 2870 | Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const |
9a2d6984 | 2871 | { |
d491d34e | 2872 | bool dummy; |
9a2d6984 ILT |
2873 | if (sym->source() == Symbol::FROM_OBJECT |
2874 | && sym->object()->is_dynamic() | |
d491d34e | 2875 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 2876 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
2877 | && !parameters->options().allow_shlib_undefined() |
2878 | && !parameters->target().is_defined_by_abi(sym) | |
fd9d194f | 2879 | && !sym->object()->is_in_system_directory()) |
9a2d6984 ILT |
2880 | { |
2881 | // A very ugly cast. | |
2882 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2883 | if (!dynobj->has_unknown_needed_entries()) | |
f073bbf7 | 2884 | gold_undefined_symbol(sym); |
9a2d6984 ILT |
2885 | } |
2886 | } | |
2887 | ||
a3ad94ed ILT |
2888 | // Write out a section symbol. Return the update offset. |
2889 | ||
2890 | void | |
9025d29d | 2891 | Symbol_table::write_section_symbol(const Output_section *os, |
d491d34e | 2892 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2893 | Output_file* of, |
2894 | off_t offset) const | |
2895 | { | |
8851ecca | 2896 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2897 | { |
9025d29d | 2898 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2899 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
2900 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
2901 | offset); | |
8851ecca | 2902 | break; |
9025d29d | 2903 | #endif |
8851ecca ILT |
2904 | #ifdef HAVE_TARGET_32_BIG |
2905 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
2906 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
2907 | offset); | |
8851ecca | 2908 | break; |
9025d29d | 2909 | #endif |
9025d29d | 2910 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2911 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
2912 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
2913 | offset); | |
8851ecca | 2914 | break; |
9025d29d | 2915 | #endif |
8851ecca ILT |
2916 | #ifdef HAVE_TARGET_64_BIG |
2917 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
2918 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
2919 | offset); | |
8851ecca ILT |
2920 | break; |
2921 | #endif | |
2922 | default: | |
2923 | gold_unreachable(); | |
a3ad94ed | 2924 | } |
a3ad94ed ILT |
2925 | } |
2926 | ||
2927 | // Write out a section symbol, specialized for size and endianness. | |
2928 | ||
2929 | template<int size, bool big_endian> | |
2930 | void | |
2931 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 2932 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2933 | Output_file* of, |
2934 | off_t offset) const | |
2935 | { | |
2936 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2937 | ||
2938 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2939 | ||
2940 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2941 | osym.put_st_name(0); | |
b4ecf66b ILT |
2942 | if (parameters->options().relocatable()) |
2943 | osym.put_st_value(0); | |
2944 | else | |
2945 | osym.put_st_value(os->address()); | |
a3ad94ed ILT |
2946 | osym.put_st_size(0); |
2947 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2948 | elfcpp::STT_SECTION)); | |
2949 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e | 2950 | |
2ea97941 ILT |
2951 | unsigned int shndx = os->out_shndx(); |
2952 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e | 2953 | { |
2ea97941 ILT |
2954 | symtab_xindex->add(os->symtab_index(), shndx); |
2955 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 2956 | } |
2ea97941 | 2957 | osym.put_st_shndx(shndx); |
a3ad94ed ILT |
2958 | |
2959 | of->write_output_view(offset, sym_size, pov); | |
2960 | } | |
2961 | ||
abaa3995 ILT |
2962 | // Print statistical information to stderr. This is used for --stats. |
2963 | ||
2964 | void | |
2965 | Symbol_table::print_stats() const | |
2966 | { | |
2967 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2968 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2969 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2970 | #else | |
2971 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2972 | program_name, this->table_.size()); | |
2973 | #endif | |
ad8f37d1 | 2974 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2975 | } |
2976 | ||
ff541f30 ILT |
2977 | // We check for ODR violations by looking for symbols with the same |
2978 | // name for which the debugging information reports that they were | |
2979 | // defined in different source locations. When comparing the source | |
2980 | // location, we consider instances with the same base filename and | |
2981 | // line number to be the same. This is because different object | |
2982 | // files/shared libraries can include the same header file using | |
2983 | // different paths, and we don't want to report an ODR violation in | |
2984 | // that case. | |
2985 | ||
2986 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2987 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2988 | // operator used with std::set. |
2989 | ||
2990 | struct Odr_violation_compare | |
2991 | { | |
2992 | bool | |
2993 | operator()(const std::string& s1, const std::string& s2) const | |
2994 | { | |
2995 | std::string::size_type pos1 = s1.rfind('/'); | |
2996 | std::string::size_type pos2 = s2.rfind('/'); | |
2997 | if (pos1 == std::string::npos | |
2998 | || pos2 == std::string::npos) | |
2999 | return s1 < s2; | |
3000 | return s1.compare(pos1, std::string::npos, | |
3001 | s2, pos2, std::string::npos) < 0; | |
3002 | } | |
3003 | }; | |
3004 | ||
70e654ba ILT |
3005 | // Check candidate_odr_violations_ to find symbols with the same name |
3006 | // but apparently different definitions (different source-file/line-no). | |
3007 | ||
3008 | void | |
17a1d0a9 ILT |
3009 | Symbol_table::detect_odr_violations(const Task* task, |
3010 | const char* output_file_name) const | |
70e654ba ILT |
3011 | { |
3012 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
3013 | it != candidate_odr_violations_.end(); | |
3014 | ++it) | |
3015 | { | |
3016 | const char* symbol_name = it->first; | |
3017 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 3018 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 3019 | |
b01c0a4a ILT |
3020 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
3021 | locs = it->second.begin(); | |
3022 | locs != it->second.end(); | |
3023 | ++locs) | |
70e654ba ILT |
3024 | { |
3025 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
3026 | // means that we have to run in a singleton Task. If we |
3027 | // want to run this in a general Task for better | |
3028 | // performance, we will need one Task for object, plus | |
3029 | // appropriate locking to ensure that we don't conflict with | |
e4e5049b CS |
3030 | // other uses of the object. Also note, one_addr2line is not |
3031 | // currently thread-safe. | |
17a1d0a9 | 3032 | Task_lock_obj<Object> tl(task, locs->object); |
e4e5049b | 3033 | // 16 is the size of the object-cache that one_addr2line should use. |
a55ce7fe | 3034 | std::string lineno = Dwarf_line_info::one_addr2line( |
e4e5049b | 3035 | locs->object, locs->shndx, locs->offset, 16); |
70e654ba ILT |
3036 | if (!lineno.empty()) |
3037 | line_nums.insert(lineno); | |
3038 | } | |
3039 | ||
3040 | if (line_nums.size() > 1) | |
3041 | { | |
dd8670e5 | 3042 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 3043 | "places (possible ODR violation):"), |
a2b1aa12 | 3044 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
3045 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
3046 | it2 != line_nums.end(); | |
3047 | ++it2) | |
3048 | fprintf(stderr, " %s\n", it2->c_str()); | |
3049 | } | |
3050 | } | |
e4e5049b CS |
3051 | // We only call one_addr2line() in this function, so we can clear its cache. |
3052 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
3053 | } |
3054 | ||
f6ce93d6 ILT |
3055 | // Warnings functions. |
3056 | ||
3057 | // Add a new warning. | |
3058 | ||
3059 | void | |
2ea97941 | 3060 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, |
cb295612 | 3061 | const std::string& warning) |
f6ce93d6 | 3062 | { |
2ea97941 ILT |
3063 | name = symtab->canonicalize_name(name); |
3064 | this->warnings_[name].set(obj, warning); | |
f6ce93d6 ILT |
3065 | } |
3066 | ||
3067 | // Look through the warnings and mark the symbols for which we should | |
3068 | // warn. This is called during Layout::finalize when we know the | |
3069 | // sources for all the symbols. | |
3070 | ||
3071 | void | |
cb295612 | 3072 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
3073 | { |
3074 | for (Warning_table::iterator p = this->warnings_.begin(); | |
3075 | p != this->warnings_.end(); | |
3076 | ++p) | |
3077 | { | |
3078 | Symbol* sym = symtab->lookup(p->first, NULL); | |
3079 | if (sym != NULL | |
3080 | && sym->source() == Symbol::FROM_OBJECT | |
3081 | && sym->object() == p->second.object) | |
cb295612 | 3082 | sym->set_has_warning(); |
f6ce93d6 ILT |
3083 | } |
3084 | } | |
3085 | ||
3086 | // Issue a warning. This is called when we see a relocation against a | |
3087 | // symbol for which has a warning. | |
3088 | ||
75f2446e | 3089 | template<int size, bool big_endian> |
f6ce93d6 | 3090 | void |
75f2446e ILT |
3091 | Warnings::issue_warning(const Symbol* sym, |
3092 | const Relocate_info<size, big_endian>* relinfo, | |
3093 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 3094 | { |
a3ad94ed | 3095 | gold_assert(sym->has_warning()); |
f6ce93d6 | 3096 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 3097 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
3098 | gold_warning_at_location(relinfo, relnum, reloffset, |
3099 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
3100 | } |
3101 | ||
14bfc3f5 ILT |
3102 | // Instantiate the templates we need. We could use the configure |
3103 | // script to restrict this to only the ones needed for implemented | |
3104 | // targets. | |
3105 | ||
c7912668 ILT |
3106 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3107 | template | |
3108 | void | |
3109 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
3110 | #endif | |
3111 | ||
3112 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3113 | template | |
3114 | void | |
3115 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
3116 | #endif | |
3117 | ||
193a53d9 | 3118 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
3119 | template |
3120 | void | |
193a53d9 ILT |
3121 | Symbol_table::add_from_relobj<32, false>( |
3122 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 3123 | const unsigned char* syms, |
14bfc3f5 | 3124 | size_t count, |
d491d34e | 3125 | size_t symndx_offset, |
14bfc3f5 ILT |
3126 | const char* sym_names, |
3127 | size_t sym_name_size, | |
ae6dce4d | 3128 | Sized_relobj<32, false>::Symbols* sympointers, |
92de84a6 | 3129 | size_t* defined); |
193a53d9 | 3130 | #endif |
14bfc3f5 | 3131 | |
193a53d9 | 3132 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
3133 | template |
3134 | void | |
193a53d9 ILT |
3135 | Symbol_table::add_from_relobj<32, true>( |
3136 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 3137 | const unsigned char* syms, |
14bfc3f5 | 3138 | size_t count, |
d491d34e | 3139 | size_t symndx_offset, |
14bfc3f5 ILT |
3140 | const char* sym_names, |
3141 | size_t sym_name_size, | |
ae6dce4d | 3142 | Sized_relobj<32, true>::Symbols* sympointers, |
92de84a6 | 3143 | size_t* defined); |
193a53d9 | 3144 | #endif |
14bfc3f5 | 3145 | |
193a53d9 | 3146 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
3147 | template |
3148 | void | |
193a53d9 ILT |
3149 | Symbol_table::add_from_relobj<64, false>( |
3150 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 3151 | const unsigned char* syms, |
14bfc3f5 | 3152 | size_t count, |
d491d34e | 3153 | size_t symndx_offset, |
14bfc3f5 ILT |
3154 | const char* sym_names, |
3155 | size_t sym_name_size, | |
ae6dce4d | 3156 | Sized_relobj<64, false>::Symbols* sympointers, |
92de84a6 | 3157 | size_t* defined); |
193a53d9 | 3158 | #endif |
14bfc3f5 | 3159 | |
193a53d9 | 3160 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
3161 | template |
3162 | void | |
193a53d9 ILT |
3163 | Symbol_table::add_from_relobj<64, true>( |
3164 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 3165 | const unsigned char* syms, |
14bfc3f5 | 3166 | size_t count, |
d491d34e | 3167 | size_t symndx_offset, |
14bfc3f5 ILT |
3168 | const char* sym_names, |
3169 | size_t sym_name_size, | |
ae6dce4d | 3170 | Sized_relobj<64, true>::Symbols* sympointers, |
92de84a6 | 3171 | size_t* defined); |
193a53d9 | 3172 | #endif |
14bfc3f5 | 3173 | |
89fc3421 CC |
3174 | #ifdef HAVE_TARGET_32_LITTLE |
3175 | template | |
3176 | Symbol* | |
3177 | Symbol_table::add_from_pluginobj<32, false>( | |
3178 | Sized_pluginobj<32, false>* obj, | |
3179 | const char* name, | |
3180 | const char* ver, | |
3181 | elfcpp::Sym<32, false>* sym); | |
3182 | #endif | |
3183 | ||
3184 | #ifdef HAVE_TARGET_32_BIG | |
3185 | template | |
3186 | Symbol* | |
3187 | Symbol_table::add_from_pluginobj<32, true>( | |
3188 | Sized_pluginobj<32, true>* obj, | |
3189 | const char* name, | |
3190 | const char* ver, | |
3191 | elfcpp::Sym<32, true>* sym); | |
3192 | #endif | |
3193 | ||
3194 | #ifdef HAVE_TARGET_64_LITTLE | |
3195 | template | |
3196 | Symbol* | |
3197 | Symbol_table::add_from_pluginobj<64, false>( | |
3198 | Sized_pluginobj<64, false>* obj, | |
3199 | const char* name, | |
3200 | const char* ver, | |
3201 | elfcpp::Sym<64, false>* sym); | |
3202 | #endif | |
3203 | ||
3204 | #ifdef HAVE_TARGET_64_BIG | |
3205 | template | |
3206 | Symbol* | |
3207 | Symbol_table::add_from_pluginobj<64, true>( | |
3208 | Sized_pluginobj<64, true>* obj, | |
3209 | const char* name, | |
3210 | const char* ver, | |
3211 | elfcpp::Sym<64, true>* sym); | |
3212 | #endif | |
3213 | ||
193a53d9 | 3214 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
3215 | template |
3216 | void | |
193a53d9 ILT |
3217 | Symbol_table::add_from_dynobj<32, false>( |
3218 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
3219 | const unsigned char* syms, |
3220 | size_t count, | |
3221 | const char* sym_names, | |
3222 | size_t sym_name_size, | |
3223 | const unsigned char* versym, | |
3224 | size_t versym_size, | |
92de84a6 ILT |
3225 | const std::vector<const char*>* version_map, |
3226 | Sized_relobj<32, false>::Symbols* sympointers, | |
3227 | size_t* defined); | |
193a53d9 | 3228 | #endif |
dbe717ef | 3229 | |
193a53d9 | 3230 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
3231 | template |
3232 | void | |
193a53d9 ILT |
3233 | Symbol_table::add_from_dynobj<32, true>( |
3234 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
3235 | const unsigned char* syms, |
3236 | size_t count, | |
3237 | const char* sym_names, | |
3238 | size_t sym_name_size, | |
3239 | const unsigned char* versym, | |
3240 | size_t versym_size, | |
92de84a6 ILT |
3241 | const std::vector<const char*>* version_map, |
3242 | Sized_relobj<32, true>::Symbols* sympointers, | |
3243 | size_t* defined); | |
193a53d9 | 3244 | #endif |
dbe717ef | 3245 | |
193a53d9 | 3246 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
3247 | template |
3248 | void | |
193a53d9 ILT |
3249 | Symbol_table::add_from_dynobj<64, false>( |
3250 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
3251 | const unsigned char* syms, |
3252 | size_t count, | |
3253 | const char* sym_names, | |
3254 | size_t sym_name_size, | |
3255 | const unsigned char* versym, | |
3256 | size_t versym_size, | |
92de84a6 ILT |
3257 | const std::vector<const char*>* version_map, |
3258 | Sized_relobj<64, false>::Symbols* sympointers, | |
3259 | size_t* defined); | |
193a53d9 | 3260 | #endif |
dbe717ef | 3261 | |
193a53d9 | 3262 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
3263 | template |
3264 | void | |
193a53d9 ILT |
3265 | Symbol_table::add_from_dynobj<64, true>( |
3266 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
3267 | const unsigned char* syms, |
3268 | size_t count, | |
3269 | const char* sym_names, | |
3270 | size_t sym_name_size, | |
3271 | const unsigned char* versym, | |
3272 | size_t versym_size, | |
92de84a6 ILT |
3273 | const std::vector<const char*>* version_map, |
3274 | Sized_relobj<64, true>::Symbols* sympointers, | |
3275 | size_t* defined); | |
193a53d9 | 3276 | #endif |
dbe717ef | 3277 | |
46fe1623 ILT |
3278 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3279 | template | |
3280 | void | |
fe8718a4 | 3281 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
3282 | Sized_symbol<32>* sym, |
3283 | Output_data* posd, | |
2ea97941 | 3284 | elfcpp::Elf_types<32>::Elf_Addr value); |
46fe1623 ILT |
3285 | #endif |
3286 | ||
3287 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3288 | template | |
3289 | void | |
fe8718a4 | 3290 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
3291 | Sized_symbol<64>* sym, |
3292 | Output_data* posd, | |
2ea97941 | 3293 | elfcpp::Elf_types<64>::Elf_Addr value); |
46fe1623 ILT |
3294 | #endif |
3295 | ||
75f2446e ILT |
3296 | #ifdef HAVE_TARGET_32_LITTLE |
3297 | template | |
3298 | void | |
3299 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
3300 | const Relocate_info<32, false>* relinfo, | |
3301 | size_t relnum, off_t reloffset) const; | |
3302 | #endif | |
3303 | ||
3304 | #ifdef HAVE_TARGET_32_BIG | |
3305 | template | |
3306 | void | |
3307 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
3308 | const Relocate_info<32, true>* relinfo, | |
3309 | size_t relnum, off_t reloffset) const; | |
3310 | #endif | |
3311 | ||
3312 | #ifdef HAVE_TARGET_64_LITTLE | |
3313 | template | |
3314 | void | |
3315 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
3316 | const Relocate_info<64, false>* relinfo, | |
3317 | size_t relnum, off_t reloffset) const; | |
3318 | #endif | |
3319 | ||
3320 | #ifdef HAVE_TARGET_64_BIG | |
3321 | template | |
3322 | void | |
3323 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
3324 | const Relocate_info<64, true>* relinfo, | |
3325 | size_t relnum, off_t reloffset) const; | |
3326 | #endif | |
3327 | ||
14bfc3f5 | 3328 | } // End namespace gold. |