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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; |
ce279a62 CC |
79 | this->undef_binding_set_ = false; |
80 | this->undef_binding_weak_ = false; | |
ead1e424 ILT |
81 | } |
82 | ||
a2b1aa12 ILT |
83 | // Return the demangled version of the symbol's name, but only |
84 | // if the --demangle flag was set. | |
85 | ||
86 | static std::string | |
2ea97941 | 87 | demangle(const char* name) |
a2b1aa12 | 88 | { |
086a1841 | 89 | if (!parameters->options().do_demangle()) |
2ea97941 | 90 | return name; |
ff541f30 | 91 | |
a2b1aa12 ILT |
92 | // cplus_demangle allocates memory for the result it returns, |
93 | // and returns NULL if the name is already demangled. | |
2ea97941 | 94 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); |
a2b1aa12 | 95 | if (demangled_name == NULL) |
2ea97941 | 96 | return name; |
a2b1aa12 ILT |
97 | |
98 | std::string retval(demangled_name); | |
99 | free(demangled_name); | |
100 | return retval; | |
101 | } | |
102 | ||
103 | std::string | |
104 | Symbol::demangled_name() const | |
105 | { | |
ff541f30 | 106 | return demangle(this->name()); |
a2b1aa12 ILT |
107 | } |
108 | ||
ead1e424 ILT |
109 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
110 | ||
111 | template<int size, bool big_endian> | |
112 | void | |
2ea97941 | 113 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
f3e9c5c5 ILT |
114 | const elfcpp::Sym<size, big_endian>& sym, |
115 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 | 116 | { |
2ea97941 | 117 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), |
ead1e424 | 118 | sym.get_st_visibility(), sym.get_st_nonvis()); |
2ea97941 | 119 | this->u_.from_object.object = object; |
d491d34e ILT |
120 | this->u_.from_object.shndx = st_shndx; |
121 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 122 | this->source_ = FROM_OBJECT; |
2ea97941 ILT |
123 | this->in_reg_ = !object->is_dynamic(); |
124 | this->in_dyn_ = object->is_dynamic(); | |
125 | this->in_real_elf_ = object->pluginobj() == NULL; | |
14bfc3f5 ILT |
126 | } |
127 | ||
ead1e424 ILT |
128 | // Initialize the fields in the base class Symbol for a symbol defined |
129 | // in an Output_data. | |
130 | ||
131 | void | |
2ea97941 ILT |
132 | Symbol::init_base_output_data(const char* name, const char* version, |
133 | Output_data* od, elfcpp::STT type, | |
134 | elfcpp::STB binding, elfcpp::STV visibility, | |
135 | unsigned char nonvis, bool offset_is_from_end) | |
ead1e424 | 136 | { |
2ea97941 | 137 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 138 | this->u_.in_output_data.output_data = od; |
2ea97941 | 139 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; |
ead1e424 | 140 | this->source_ = IN_OUTPUT_DATA; |
008db82e | 141 | this->in_reg_ = true; |
89fc3421 | 142 | this->in_real_elf_ = true; |
ead1e424 ILT |
143 | } |
144 | ||
145 | // Initialize the fields in the base class Symbol for a symbol defined | |
146 | // in an Output_segment. | |
147 | ||
148 | void | |
2ea97941 ILT |
149 | Symbol::init_base_output_segment(const char* name, const char* version, |
150 | Output_segment* os, elfcpp::STT type, | |
151 | elfcpp::STB binding, elfcpp::STV visibility, | |
152 | unsigned char nonvis, | |
153 | Segment_offset_base offset_base) | |
ead1e424 | 154 | { |
2ea97941 | 155 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 | 156 | this->u_.in_output_segment.output_segment = os; |
2ea97941 | 157 | this->u_.in_output_segment.offset_base = offset_base; |
ead1e424 | 158 | this->source_ = IN_OUTPUT_SEGMENT; |
008db82e | 159 | this->in_reg_ = true; |
89fc3421 | 160 | this->in_real_elf_ = true; |
ead1e424 ILT |
161 | } |
162 | ||
163 | // Initialize the fields in the base class Symbol for a symbol defined | |
164 | // as a constant. | |
165 | ||
166 | void | |
2ea97941 ILT |
167 | Symbol::init_base_constant(const char* name, const char* version, |
168 | elfcpp::STT type, elfcpp::STB binding, | |
169 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 170 | { |
2ea97941 | 171 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
172 | this->source_ = IS_CONSTANT; |
173 | this->in_reg_ = true; | |
89fc3421 | 174 | this->in_real_elf_ = true; |
f3e9c5c5 ILT |
175 | } |
176 | ||
177 | // Initialize the fields in the base class Symbol for an undefined | |
178 | // symbol. | |
179 | ||
180 | void | |
2ea97941 ILT |
181 | Symbol::init_base_undefined(const char* name, const char* version, |
182 | elfcpp::STT type, elfcpp::STB binding, | |
183 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 184 | { |
2ea97941 | 185 | this->init_fields(name, version, type, binding, visibility, nonvis); |
d7ab2a47 | 186 | this->dynsym_index_ = -1U; |
f3e9c5c5 | 187 | this->source_ = IS_UNDEFINED; |
008db82e | 188 | this->in_reg_ = true; |
89fc3421 | 189 | this->in_real_elf_ = true; |
ead1e424 ILT |
190 | } |
191 | ||
c7912668 ILT |
192 | // Allocate a common symbol in the base. |
193 | ||
194 | void | |
195 | Symbol::allocate_base_common(Output_data* od) | |
196 | { | |
197 | gold_assert(this->is_common()); | |
198 | this->source_ = IN_OUTPUT_DATA; | |
199 | this->u_.in_output_data.output_data = od; | |
200 | this->u_.in_output_data.offset_is_from_end = false; | |
201 | } | |
202 | ||
ead1e424 | 203 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
204 | |
205 | template<int size> | |
206 | template<bool big_endian> | |
207 | void | |
2ea97941 ILT |
208 | Sized_symbol<size>::init_object(const char* name, const char* version, |
209 | Object* object, | |
f3e9c5c5 ILT |
210 | const elfcpp::Sym<size, big_endian>& sym, |
211 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 212 | { |
2ea97941 | 213 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 214 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
215 | this->symsize_ = sym.get_st_size(); |
216 | } | |
217 | ||
218 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
219 | // Output_data. | |
220 | ||
221 | template<int size> | |
222 | void | |
2ea97941 ILT |
223 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
224 | Output_data* od, Value_type value, | |
225 | Size_type symsize, elfcpp::STT type, | |
226 | elfcpp::STB binding, | |
227 | elfcpp::STV visibility, | |
228 | unsigned char nonvis, | |
229 | bool offset_is_from_end) | |
ead1e424 | 230 | { |
2ea97941 ILT |
231 | this->init_base_output_data(name, version, od, type, binding, visibility, |
232 | nonvis, offset_is_from_end); | |
233 | this->value_ = value; | |
234 | this->symsize_ = symsize; | |
ead1e424 ILT |
235 | } |
236 | ||
237 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
238 | // Output_segment. | |
239 | ||
240 | template<int size> | |
241 | void | |
2ea97941 ILT |
242 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
243 | Output_segment* os, Value_type value, | |
244 | Size_type symsize, elfcpp::STT type, | |
245 | elfcpp::STB binding, | |
246 | elfcpp::STV visibility, | |
247 | unsigned char nonvis, | |
248 | Segment_offset_base offset_base) | |
ead1e424 | 249 | { |
2ea97941 ILT |
250 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
251 | nonvis, offset_base); | |
252 | this->value_ = value; | |
253 | this->symsize_ = symsize; | |
ead1e424 ILT |
254 | } |
255 | ||
256 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
257 | // constant. | |
258 | ||
259 | template<int size> | |
260 | void | |
2ea97941 ILT |
261 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
262 | Value_type value, Size_type symsize, | |
263 | elfcpp::STT type, elfcpp::STB binding, | |
264 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 265 | { |
2ea97941 ILT |
266 | this->init_base_constant(name, version, type, binding, visibility, nonvis); |
267 | this->value_ = value; | |
268 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
269 | } |
270 | ||
f3e9c5c5 ILT |
271 | // Initialize the fields in Sized_symbol for an undefined symbol. |
272 | ||
273 | template<int size> | |
274 | void | |
2ea97941 ILT |
275 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
276 | elfcpp::STT type, elfcpp::STB binding, | |
277 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 278 | { |
2ea97941 | 279 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
280 | this->value_ = 0; |
281 | this->symsize_ = 0; | |
282 | } | |
283 | ||
8a5e3e08 ILT |
284 | // Return true if SHNDX represents a common symbol. |
285 | ||
286 | bool | |
2ea97941 | 287 | Symbol::is_common_shndx(unsigned int shndx) |
8a5e3e08 | 288 | { |
2ea97941 ILT |
289 | return (shndx == elfcpp::SHN_COMMON |
290 | || shndx == parameters->target().small_common_shndx() | |
291 | || shndx == parameters->target().large_common_shndx()); | |
8a5e3e08 ILT |
292 | } |
293 | ||
c7912668 ILT |
294 | // Allocate a common symbol. |
295 | ||
296 | template<int size> | |
297 | void | |
2ea97941 | 298 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) |
c7912668 ILT |
299 | { |
300 | this->allocate_base_common(od); | |
2ea97941 | 301 | this->value_ = value; |
c7912668 ILT |
302 | } |
303 | ||
c82fbeee CS |
304 | // The ""'s around str ensure str is a string literal, so sizeof works. |
305 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) | |
306 | ||
436ca963 ILT |
307 | // Return true if this symbol should be added to the dynamic symbol |
308 | // table. | |
309 | ||
310 | inline bool | |
ce97fa81 | 311 | Symbol::should_add_dynsym_entry(Symbol_table* symtab) const |
436ca963 ILT |
312 | { |
313 | // If the symbol is used by a dynamic relocation, we need to add it. | |
314 | if (this->needs_dynsym_entry()) | |
315 | return true; | |
316 | ||
6d03d481 ST |
317 | // If this symbol's section is not added, the symbol need not be added. |
318 | // The section may have been GCed. Note that export_dynamic is being | |
319 | // overridden here. This should not be done for shared objects. | |
320 | if (parameters->options().gc_sections() | |
321 | && !parameters->options().shared() | |
322 | && this->source() == Symbol::FROM_OBJECT | |
323 | && !this->object()->is_dynamic()) | |
324 | { | |
325 | Relobj* relobj = static_cast<Relobj*>(this->object()); | |
326 | bool is_ordinary; | |
2ea97941 ILT |
327 | unsigned int shndx = this->shndx(&is_ordinary); |
328 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF | |
ce97fa81 ST |
329 | && !relobj->is_section_included(shndx) |
330 | && !symtab->is_section_folded(relobj, shndx)) | |
6d03d481 ST |
331 | return false; |
332 | } | |
333 | ||
55a93433 ILT |
334 | // If the symbol was forced local in a version script, do not add it. |
335 | if (this->is_forced_local()) | |
336 | return false; | |
337 | ||
c82fbeee CS |
338 | // If the symbol was forced dynamic in a --dynamic-list file, add it. |
339 | if (parameters->options().in_dynamic_list(this->name())) | |
340 | return true; | |
341 | ||
342 | // If dynamic-list-data was specified, add any STT_OBJECT. | |
343 | if (parameters->options().dynamic_list_data() | |
344 | && !this->is_from_dynobj() | |
345 | && this->type() == elfcpp::STT_OBJECT) | |
346 | return true; | |
347 | ||
348 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. | |
349 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. | |
350 | if ((parameters->options().dynamic_list_cpp_new() | |
351 | || parameters->options().dynamic_list_cpp_typeinfo()) | |
352 | && !this->is_from_dynobj()) | |
353 | { | |
354 | // TODO(csilvers): We could probably figure out if we're an operator | |
355 | // new/delete or typeinfo without the need to demangle. | |
2ea97941 ILT |
356 | char* demangled_name = cplus_demangle(this->name(), |
357 | DMGL_ANSI | DMGL_PARAMS); | |
358 | if (demangled_name == NULL) | |
c82fbeee CS |
359 | { |
360 | // Not a C++ symbol, so it can't satisfy these flags | |
361 | } | |
362 | else if (parameters->options().dynamic_list_cpp_new() | |
2ea97941 ILT |
363 | && (strprefix(demangled_name, "operator new") |
364 | || strprefix(demangled_name, "operator delete"))) | |
c82fbeee | 365 | { |
2ea97941 | 366 | free(demangled_name); |
c82fbeee CS |
367 | return true; |
368 | } | |
369 | else if (parameters->options().dynamic_list_cpp_typeinfo() | |
2ea97941 ILT |
370 | && (strprefix(demangled_name, "typeinfo name for") |
371 | || strprefix(demangled_name, "typeinfo for"))) | |
c82fbeee | 372 | { |
2ea97941 | 373 | free(demangled_name); |
c82fbeee CS |
374 | return true; |
375 | } | |
376 | else | |
2ea97941 | 377 | free(demangled_name); |
c82fbeee CS |
378 | } |
379 | ||
436ca963 ILT |
380 | // If exporting all symbols or building a shared library, |
381 | // and the symbol is defined in a regular object and is | |
382 | // externally visible, we need to add it. | |
8851ecca | 383 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
384 | && !this->is_from_dynobj() |
385 | && this->is_externally_visible()) | |
386 | return true; | |
387 | ||
388 | return false; | |
389 | } | |
390 | ||
b3b74ddc ILT |
391 | // Return true if the final value of this symbol is known at link |
392 | // time. | |
393 | ||
394 | bool | |
395 | Symbol::final_value_is_known() const | |
396 | { | |
397 | // If we are not generating an executable, then no final values are | |
398 | // known, since they will change at runtime. | |
374ad285 ILT |
399 | if (parameters->options().output_is_position_independent() |
400 | || parameters->options().relocatable()) | |
b3b74ddc ILT |
401 | return false; |
402 | ||
f3e9c5c5 ILT |
403 | // If the symbol is not from an object file, and is not undefined, |
404 | // then it is defined, and known. | |
b3b74ddc | 405 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
406 | { |
407 | if (this->source_ != IS_UNDEFINED) | |
408 | return true; | |
409 | } | |
410 | else | |
411 | { | |
412 | // If the symbol is from a dynamic object, then the final value | |
413 | // is not known. | |
414 | if (this->object()->is_dynamic()) | |
415 | return false; | |
b3b74ddc | 416 | |
f3e9c5c5 ILT |
417 | // If the symbol is not undefined (it is defined or common), |
418 | // then the final value is known. | |
419 | if (!this->is_undefined()) | |
420 | return true; | |
421 | } | |
b3b74ddc ILT |
422 | |
423 | // If the symbol is undefined, then whether the final value is known | |
424 | // depends on whether we are doing a static link. If we are doing a | |
425 | // dynamic link, then the final value could be filled in at runtime. | |
426 | // This could reasonably be the case for a weak undefined symbol. | |
427 | return parameters->doing_static_link(); | |
428 | } | |
429 | ||
77e65537 | 430 | // Return the output section where this symbol is defined. |
a445fddf | 431 | |
77e65537 ILT |
432 | Output_section* |
433 | Symbol::output_section() const | |
a445fddf ILT |
434 | { |
435 | switch (this->source_) | |
436 | { | |
437 | case FROM_OBJECT: | |
77e65537 | 438 | { |
2ea97941 ILT |
439 | unsigned int shndx = this->u_.from_object.shndx; |
440 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) | |
77e65537 ILT |
441 | { |
442 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 443 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 444 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
2ea97941 | 445 | return relobj->output_section(shndx); |
77e65537 ILT |
446 | } |
447 | return NULL; | |
448 | } | |
449 | ||
a445fddf | 450 | case IN_OUTPUT_DATA: |
77e65537 ILT |
451 | return this->u_.in_output_data.output_data->output_section(); |
452 | ||
a445fddf | 453 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
454 | case IS_CONSTANT: |
455 | case IS_UNDEFINED: | |
77e65537 ILT |
456 | return NULL; |
457 | ||
458 | default: | |
459 | gold_unreachable(); | |
460 | } | |
461 | } | |
462 | ||
463 | // Set the symbol's output section. This is used for symbols defined | |
464 | // in scripts. This should only be called after the symbol table has | |
465 | // been finalized. | |
466 | ||
467 | void | |
468 | Symbol::set_output_section(Output_section* os) | |
469 | { | |
470 | switch (this->source_) | |
471 | { | |
472 | case FROM_OBJECT: | |
473 | case IN_OUTPUT_DATA: | |
474 | gold_assert(this->output_section() == os); | |
475 | break; | |
f3e9c5c5 | 476 | case IS_CONSTANT: |
77e65537 ILT |
477 | this->source_ = IN_OUTPUT_DATA; |
478 | this->u_.in_output_data.output_data = os; | |
479 | this->u_.in_output_data.offset_is_from_end = false; | |
480 | break; | |
481 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 482 | case IS_UNDEFINED: |
a445fddf ILT |
483 | default: |
484 | gold_unreachable(); | |
485 | } | |
486 | } | |
487 | ||
14bfc3f5 ILT |
488 | // Class Symbol_table. |
489 | ||
09124467 | 490 | Symbol_table::Symbol_table(unsigned int count, |
2ea97941 | 491 | const Version_script_info& version_script) |
6d013333 | 492 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
8a5e3e08 ILT |
493 | forwarders_(), commons_(), tls_commons_(), small_commons_(), |
494 | large_commons_(), forced_locals_(), warnings_(), | |
2ea97941 | 495 | version_script_(version_script), gc_(NULL), icf_(NULL) |
14bfc3f5 | 496 | { |
6d013333 | 497 | namepool_.reserve(count); |
14bfc3f5 ILT |
498 | } |
499 | ||
500 | Symbol_table::~Symbol_table() | |
501 | { | |
502 | } | |
503 | ||
ad8f37d1 | 504 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 505 | |
ad8f37d1 | 506 | inline size_t |
14bfc3f5 ILT |
507 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
508 | { | |
f0641a0b | 509 | return key.first ^ key.second; |
14bfc3f5 ILT |
510 | } |
511 | ||
ad8f37d1 ILT |
512 | // The symbol table key equality function. This is called with |
513 | // Stringpool keys. | |
14bfc3f5 | 514 | |
ad8f37d1 | 515 | inline bool |
14bfc3f5 ILT |
516 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
517 | const Symbol_table_key& k2) const | |
518 | { | |
519 | return k1.first == k2.first && k1.second == k2.second; | |
520 | } | |
521 | ||
ef15dade | 522 | bool |
2ea97941 | 523 | Symbol_table::is_section_folded(Object* obj, unsigned int shndx) const |
ef15dade | 524 | { |
032ce4e9 | 525 | return (parameters->options().icf_enabled() |
2ea97941 | 526 | && this->icf_->is_section_folded(obj, shndx)); |
ef15dade ST |
527 | } |
528 | ||
6d03d481 ST |
529 | // For symbols that have been listed with -u option, add them to the |
530 | // work list to avoid gc'ing them. | |
531 | ||
532 | void | |
533 | Symbol_table::gc_mark_undef_symbols() | |
534 | { | |
535 | for (options::String_set::const_iterator p = | |
536 | parameters->options().undefined_begin(); | |
537 | p != parameters->options().undefined_end(); | |
538 | ++p) | |
539 | { | |
2ea97941 ILT |
540 | const char* name = p->c_str(); |
541 | Symbol* sym = this->lookup(name); | |
6d03d481 ST |
542 | gold_assert (sym != NULL); |
543 | if (sym->source() == Symbol::FROM_OBJECT | |
544 | && !sym->object()->is_dynamic()) | |
545 | { | |
546 | Relobj* obj = static_cast<Relobj*>(sym->object()); | |
547 | bool is_ordinary; | |
2ea97941 | 548 | unsigned int shndx = sym->shndx(&is_ordinary); |
6d03d481 ST |
549 | if (is_ordinary) |
550 | { | |
551 | gold_assert(this->gc_ != NULL); | |
2ea97941 | 552 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
553 | } |
554 | } | |
555 | } | |
556 | } | |
557 | ||
558 | void | |
559 | Symbol_table::gc_mark_symbol_for_shlib(Symbol* sym) | |
560 | { | |
561 | if (!sym->is_from_dynobj() | |
562 | && sym->is_externally_visible()) | |
563 | { | |
564 | //Add the object and section to the work list. | |
565 | Relobj* obj = static_cast<Relobj*>(sym->object()); | |
566 | bool is_ordinary; | |
2ea97941 ILT |
567 | unsigned int shndx = sym->shndx(&is_ordinary); |
568 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF) | |
6d03d481 ST |
569 | { |
570 | gold_assert(this->gc_!= NULL); | |
2ea97941 | 571 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
572 | } |
573 | } | |
574 | } | |
575 | ||
576 | // When doing garbage collection, keep symbols that have been seen in | |
577 | // dynamic objects. | |
578 | inline void | |
579 | Symbol_table::gc_mark_dyn_syms(Symbol* sym) | |
580 | { | |
581 | if (sym->in_dyn() && sym->source() == Symbol::FROM_OBJECT | |
582 | && !sym->object()->is_dynamic()) | |
583 | { | |
584 | Relobj *obj = static_cast<Relobj*>(sym->object()); | |
585 | bool is_ordinary; | |
2ea97941 ILT |
586 | unsigned int shndx = sym->shndx(&is_ordinary); |
587 | if (is_ordinary && shndx != elfcpp::SHN_UNDEF) | |
6d03d481 ST |
588 | { |
589 | gold_assert(this->gc_ != NULL); | |
2ea97941 | 590 | this->gc_->worklist().push(Section_id(obj, shndx)); |
6d03d481 ST |
591 | } |
592 | } | |
593 | } | |
594 | ||
dd8670e5 | 595 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
596 | |
597 | void | |
598 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
599 | { | |
a3ad94ed ILT |
600 | gold_assert(from != to); |
601 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
602 | this->forwarders_[from] = to; |
603 | from->set_forwarder(); | |
604 | } | |
605 | ||
61ba1cf9 ILT |
606 | // Resolve the forwards from FROM, returning the real symbol. |
607 | ||
14bfc3f5 | 608 | Symbol* |
c06b7b0b | 609 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 610 | { |
a3ad94ed | 611 | gold_assert(from->is_forwarder()); |
c06b7b0b | 612 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 613 | this->forwarders_.find(from); |
a3ad94ed | 614 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
615 | return p->second; |
616 | } | |
617 | ||
61ba1cf9 ILT |
618 | // Look up a symbol by name. |
619 | ||
620 | Symbol* | |
2ea97941 | 621 | Symbol_table::lookup(const char* name, const char* version) const |
61ba1cf9 | 622 | { |
f0641a0b | 623 | Stringpool::Key name_key; |
2ea97941 ILT |
624 | name = this->namepool_.find(name, &name_key); |
625 | if (name == NULL) | |
61ba1cf9 | 626 | return NULL; |
f0641a0b ILT |
627 | |
628 | Stringpool::Key version_key = 0; | |
2ea97941 | 629 | if (version != NULL) |
61ba1cf9 | 630 | { |
2ea97941 ILT |
631 | version = this->namepool_.find(version, &version_key); |
632 | if (version == NULL) | |
61ba1cf9 ILT |
633 | return NULL; |
634 | } | |
635 | ||
f0641a0b | 636 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
637 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
638 | if (p == this->table_.end()) | |
639 | return NULL; | |
640 | return p->second; | |
641 | } | |
642 | ||
14bfc3f5 ILT |
643 | // Resolve a Symbol with another Symbol. This is only used in the |
644 | // unusual case where there are references to both an unversioned | |
645 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
646 | // version is the default version. Because this is unusual, we do |
647 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 648 | |
1564db8d | 649 | template<int size, bool big_endian> |
14bfc3f5 | 650 | void |
95d14cd3 | 651 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 652 | { |
1564db8d ILT |
653 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
654 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 655 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
656 | esym.put_st_value(from->value()); |
657 | esym.put_st_size(from->symsize()); | |
658 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 659 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e | 660 | bool is_ordinary; |
2ea97941 ILT |
661 | unsigned int shndx = from->shndx(&is_ordinary); |
662 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
95d14cd3 | 663 | from->version()); |
1ebd95fd ILT |
664 | if (from->in_reg()) |
665 | to->set_in_reg(); | |
666 | if (from->in_dyn()) | |
667 | to->set_in_dyn(); | |
6d03d481 ST |
668 | if (parameters->options().gc_sections()) |
669 | this->gc_mark_dyn_syms(to); | |
14bfc3f5 ILT |
670 | } |
671 | ||
0602e05a ILT |
672 | // Record that a symbol is forced to be local by a version script or |
673 | // by visibility. | |
55a93433 ILT |
674 | |
675 | void | |
676 | Symbol_table::force_local(Symbol* sym) | |
677 | { | |
678 | if (!sym->is_defined() && !sym->is_common()) | |
679 | return; | |
680 | if (sym->is_forced_local()) | |
681 | { | |
682 | // We already got this one. | |
683 | return; | |
684 | } | |
685 | sym->set_is_forced_local(); | |
686 | this->forced_locals_.push_back(sym); | |
687 | } | |
688 | ||
0864d551 ILT |
689 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
690 | // is only called for undefined symbols, when at least one --wrap | |
691 | // option was used. | |
692 | ||
693 | const char* | |
2ea97941 | 694 | Symbol_table::wrap_symbol(const char* name, Stringpool::Key* name_key) |
0864d551 ILT |
695 | { |
696 | // For some targets, we need to ignore a specific character when | |
697 | // wrapping, and add it back later. | |
698 | char prefix = '\0'; | |
2ea97941 | 699 | if (name[0] == parameters->target().wrap_char()) |
0864d551 | 700 | { |
2ea97941 ILT |
701 | prefix = name[0]; |
702 | ++name; | |
0864d551 ILT |
703 | } |
704 | ||
2ea97941 | 705 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
706 | { |
707 | // Turn NAME into __wrap_NAME. | |
708 | std::string s; | |
709 | if (prefix != '\0') | |
710 | s += prefix; | |
711 | s += "__wrap_"; | |
2ea97941 | 712 | s += name; |
0864d551 ILT |
713 | |
714 | // This will give us both the old and new name in NAMEPOOL_, but | |
715 | // that is OK. Only the versions we need will wind up in the | |
716 | // real string table in the output file. | |
717 | return this->namepool_.add(s.c_str(), true, name_key); | |
718 | } | |
719 | ||
720 | const char* const real_prefix = "__real_"; | |
721 | const size_t real_prefix_length = strlen(real_prefix); | |
2ea97941 ILT |
722 | if (strncmp(name, real_prefix, real_prefix_length) == 0 |
723 | && parameters->options().is_wrap(name + real_prefix_length)) | |
0864d551 ILT |
724 | { |
725 | // Turn __real_NAME into NAME. | |
726 | std::string s; | |
727 | if (prefix != '\0') | |
728 | s += prefix; | |
2ea97941 | 729 | s += name + real_prefix_length; |
0864d551 ILT |
730 | return this->namepool_.add(s.c_str(), true, name_key); |
731 | } | |
732 | ||
2ea97941 | 733 | return name; |
0864d551 ILT |
734 | } |
735 | ||
8c500701 ILT |
736 | // This is called when we see a symbol NAME/VERSION, and the symbol |
737 | // already exists in the symbol table, and VERSION is marked as being | |
738 | // the default version. SYM is the NAME/VERSION symbol we just added. | |
739 | // DEFAULT_IS_NEW is true if this is the first time we have seen the | |
740 | // symbol NAME/NULL. PDEF points to the entry for NAME/NULL. | |
741 | ||
742 | template<int size, bool big_endian> | |
743 | void | |
744 | Symbol_table::define_default_version(Sized_symbol<size>* sym, | |
745 | bool default_is_new, | |
746 | Symbol_table_type::iterator pdef) | |
747 | { | |
748 | if (default_is_new) | |
749 | { | |
750 | // This is the first time we have seen NAME/NULL. Make | |
751 | // NAME/NULL point to NAME/VERSION, and mark SYM as the default | |
752 | // version. | |
753 | pdef->second = sym; | |
754 | sym->set_is_default(); | |
755 | } | |
756 | else if (pdef->second == sym) | |
757 | { | |
758 | // NAME/NULL already points to NAME/VERSION. Don't mark the | |
759 | // symbol as the default if it is not already the default. | |
760 | } | |
761 | else | |
762 | { | |
763 | // This is the unfortunate case where we already have entries | |
764 | // for both NAME/VERSION and NAME/NULL. We now see a symbol | |
765 | // NAME/VERSION where VERSION is the default version. We have | |
766 | // already resolved this new symbol with the existing | |
767 | // NAME/VERSION symbol. | |
768 | ||
769 | // It's possible that NAME/NULL and NAME/VERSION are both | |
770 | // defined in regular objects. This can only happen if one | |
771 | // object file defines foo and another defines foo@@ver. This | |
772 | // is somewhat obscure, but we call it a multiple definition | |
773 | // error. | |
774 | ||
775 | // It's possible that NAME/NULL actually has a version, in which | |
776 | // case it won't be the same as VERSION. This happens with | |
777 | // ver_test_7.so in the testsuite for the symbol t2_2. We see | |
778 | // t2_2@@VER2, so we define both t2_2/VER2 and t2_2/NULL. We | |
779 | // then see an unadorned t2_2 in an object file and give it | |
780 | // version VER1 from the version script. This looks like a | |
781 | // default definition for VER1, so it looks like we should merge | |
782 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, but it's | |
783 | // not obvious that this is an error, either. So we just punt. | |
784 | ||
785 | // If one of the symbols has non-default visibility, and the | |
786 | // other is defined in a shared object, then they are different | |
787 | // symbols. | |
788 | ||
789 | // Otherwise, we just resolve the symbols as though they were | |
790 | // the same. | |
791 | ||
792 | if (pdef->second->version() != NULL) | |
793 | gold_assert(pdef->second->version() != sym->version()); | |
794 | else if (sym->visibility() != elfcpp::STV_DEFAULT | |
795 | && pdef->second->is_from_dynobj()) | |
796 | ; | |
797 | else if (pdef->second->visibility() != elfcpp::STV_DEFAULT | |
798 | && sym->is_from_dynobj()) | |
799 | ; | |
800 | else | |
801 | { | |
802 | const Sized_symbol<size>* symdef; | |
803 | symdef = this->get_sized_symbol<size>(pdef->second); | |
804 | Symbol_table::resolve<size, big_endian>(sym, symdef); | |
805 | this->make_forwarder(pdef->second, sym); | |
806 | pdef->second = sym; | |
807 | sym->set_is_default(); | |
808 | } | |
809 | } | |
810 | } | |
811 | ||
14bfc3f5 ILT |
812 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
813 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
814 | // whether this is the default version. ST_SHNDX is the symbol's |
815 | // section index; IS_ORDINARY is whether this is a normal section | |
816 | // rather than a special code. | |
14bfc3f5 | 817 | |
8781f709 ILT |
818 | // If IS_DEFAULT_VERSION is true, then this is the definition of a |
819 | // default version of a symbol. That means that any lookup of | |
820 | // NAME/NULL and any lookup of NAME/VERSION should always return the | |
821 | // same symbol. This is obvious for references, but in particular we | |
822 | // want to do this for definitions: overriding NAME/NULL should also | |
823 | // override NAME/VERSION. If we don't do that, it would be very hard | |
824 | // to override functions in a shared library which uses versioning. | |
14bfc3f5 ILT |
825 | |
826 | // We implement this by simply making both entries in the hash table | |
827 | // point to the same Symbol structure. That is easy enough if this is | |
828 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
829 | // that we have seen both already, in which case they will both have | |
830 | // independent entries in the symbol table. We can't simply change | |
831 | // the symbol table entry, because we have pointers to the entries | |
832 | // attached to the object files. So we mark the entry attached to the | |
833 | // object file as a forwarder, and record it in the forwarders_ map. | |
834 | // Note that entries in the hash table will never be marked as | |
835 | // forwarders. | |
70e654ba | 836 | // |
d491d34e ILT |
837 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
838 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
839 | // for a special section code. ST_SHNDX may be modified if the symbol | |
840 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
841 | |
842 | template<int size, bool big_endian> | |
aeddab66 | 843 | Sized_symbol<size>* |
2ea97941 ILT |
844 | Symbol_table::add_from_object(Object* object, |
845 | const char *name, | |
f0641a0b | 846 | Stringpool::Key name_key, |
2ea97941 | 847 | const char *version, |
f0641a0b | 848 | Stringpool::Key version_key, |
8781f709 | 849 | bool is_default_version, |
70e654ba | 850 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
851 | unsigned int st_shndx, |
852 | bool is_ordinary, | |
853 | unsigned int orig_st_shndx) | |
14bfc3f5 | 854 | { |
c5818ff1 | 855 | // Print a message if this symbol is being traced. |
2ea97941 | 856 | if (parameters->options().is_trace_symbol(name)) |
c5818ff1 | 857 | { |
d491d34e | 858 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
2ea97941 | 859 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
c5818ff1 | 860 | else |
2ea97941 | 861 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); |
c5818ff1 CC |
862 | } |
863 | ||
0864d551 ILT |
864 | // For an undefined symbol, we may need to adjust the name using |
865 | // --wrap. | |
d491d34e | 866 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 867 | && parameters->options().any_wrap()) |
0864d551 | 868 | { |
2ea97941 ILT |
869 | const char* wrap_name = this->wrap_symbol(name, &name_key); |
870 | if (wrap_name != name) | |
0864d551 ILT |
871 | { |
872 | // If we see a reference to malloc with version GLIBC_2.0, | |
873 | // and we turn it into a reference to __wrap_malloc, then we | |
874 | // discard the version number. Otherwise the user would be | |
875 | // required to specify the correct version for | |
876 | // __wrap_malloc. | |
2ea97941 | 877 | version = NULL; |
0864d551 | 878 | version_key = 0; |
2ea97941 | 879 | name = wrap_name; |
0864d551 ILT |
880 | } |
881 | } | |
882 | ||
14bfc3f5 ILT |
883 | Symbol* const snull = NULL; |
884 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
885 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
886 | snull)); | |
14bfc3f5 | 887 | |
8781f709 | 888 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
14bfc3f5 | 889 | std::make_pair(this->table_.end(), false); |
8781f709 | 890 | if (is_default_version) |
14bfc3f5 | 891 | { |
f0641a0b | 892 | const Stringpool::Key vnull_key = 0; |
8781f709 ILT |
893 | insdefault = this->table_.insert(std::make_pair(std::make_pair(name_key, |
894 | vnull_key), | |
895 | snull)); | |
14bfc3f5 ILT |
896 | } |
897 | ||
898 | // ins.first: an iterator, which is a pointer to a pair. | |
899 | // ins.first->first: the key (a pair of name and version). | |
900 | // ins.first->second: the value (Symbol*). | |
901 | // ins.second: true if new entry was inserted, false if not. | |
902 | ||
1564db8d | 903 | Sized_symbol<size>* ret; |
ead1e424 ILT |
904 | bool was_undefined; |
905 | bool was_common; | |
14bfc3f5 ILT |
906 | if (!ins.second) |
907 | { | |
908 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 909 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 910 | gold_assert(ret != NULL); |
ead1e424 ILT |
911 | |
912 | was_undefined = ret->is_undefined(); | |
913 | was_common = ret->is_common(); | |
914 | ||
2ea97941 ILT |
915 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
916 | version); | |
6d03d481 ST |
917 | if (parameters->options().gc_sections()) |
918 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 | 919 | |
8781f709 ILT |
920 | if (is_default_version) |
921 | this->define_default_version<size, big_endian>(ret, insdefault.second, | |
922 | insdefault.first); | |
14bfc3f5 ILT |
923 | } |
924 | else | |
925 | { | |
926 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 927 | gold_assert(ins.first->second == NULL); |
ead1e424 | 928 | |
8781f709 | 929 | if (is_default_version && !insdefault.second) |
14bfc3f5 | 930 | { |
14b31740 ILT |
931 | // We already have an entry for NAME/NULL. If we override |
932 | // it, then change it to NAME/VERSION. | |
8781f709 | 933 | ret = this->get_sized_symbol<size>(insdefault.first->second); |
18e6b24e ILT |
934 | |
935 | was_undefined = ret->is_undefined(); | |
936 | was_common = ret->is_common(); | |
937 | ||
2ea97941 ILT |
938 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
939 | version); | |
6d03d481 ST |
940 | if (parameters->options().gc_sections()) |
941 | this->gc_mark_dyn_syms(ret); | |
14bfc3f5 ILT |
942 | ins.first->second = ret; |
943 | } | |
944 | else | |
945 | { | |
18e6b24e ILT |
946 | was_undefined = false; |
947 | was_common = false; | |
948 | ||
f6ce93d6 | 949 | Sized_target<size, big_endian>* target = |
029ba973 | 950 | parameters->sized_target<size, big_endian>(); |
1564db8d ILT |
951 | if (!target->has_make_symbol()) |
952 | ret = new Sized_symbol<size>(); | |
953 | else | |
14bfc3f5 | 954 | { |
1564db8d ILT |
955 | ret = target->make_symbol(); |
956 | if (ret == NULL) | |
14bfc3f5 ILT |
957 | { |
958 | // This means that we don't want a symbol table | |
959 | // entry after all. | |
8781f709 | 960 | if (!is_default_version) |
14bfc3f5 ILT |
961 | this->table_.erase(ins.first); |
962 | else | |
963 | { | |
8781f709 ILT |
964 | this->table_.erase(insdefault.first); |
965 | // Inserting INSDEFAULT invalidated INS. | |
f0641a0b ILT |
966 | this->table_.erase(std::make_pair(name_key, |
967 | version_key)); | |
14bfc3f5 ILT |
968 | } |
969 | return NULL; | |
970 | } | |
971 | } | |
14bfc3f5 | 972 | |
2ea97941 | 973 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 974 | |
14bfc3f5 | 975 | ins.first->second = ret; |
8781f709 | 976 | if (is_default_version) |
14bfc3f5 ILT |
977 | { |
978 | // This is the first time we have seen NAME/NULL. Point | |
979 | // it at the new entry for NAME/VERSION. | |
8781f709 ILT |
980 | gold_assert(insdefault.second); |
981 | insdefault.first->second = ret; | |
14bfc3f5 ILT |
982 | } |
983 | } | |
8c500701 | 984 | |
8781f709 | 985 | if (is_default_version) |
8c500701 | 986 | ret->set_is_default(); |
14bfc3f5 ILT |
987 | } |
988 | ||
ead1e424 ILT |
989 | // Record every time we see a new undefined symbol, to speed up |
990 | // archive groups. | |
991 | if (!was_undefined && ret->is_undefined()) | |
992 | ++this->saw_undefined_; | |
993 | ||
994 | // Keep track of common symbols, to speed up common symbol | |
995 | // allocation. | |
996 | if (!was_common && ret->is_common()) | |
155a0dd7 | 997 | { |
8a5e3e08 | 998 | if (ret->type() == elfcpp::STT_TLS) |
155a0dd7 | 999 | this->tls_commons_.push_back(ret); |
8a5e3e08 ILT |
1000 | else if (!is_ordinary |
1001 | && st_shndx == parameters->target().small_common_shndx()) | |
1002 | this->small_commons_.push_back(ret); | |
1003 | else if (!is_ordinary | |
1004 | && st_shndx == parameters->target().large_common_shndx()) | |
1005 | this->large_commons_.push_back(ret); | |
1006 | else | |
1007 | this->commons_.push_back(ret); | |
155a0dd7 | 1008 | } |
ead1e424 | 1009 | |
0602e05a ILT |
1010 | // If we're not doing a relocatable link, then any symbol with |
1011 | // hidden or internal visibility is local. | |
1012 | if ((ret->visibility() == elfcpp::STV_HIDDEN | |
1013 | || ret->visibility() == elfcpp::STV_INTERNAL) | |
1014 | && (ret->binding() == elfcpp::STB_GLOBAL | |
adcf2816 | 1015 | || ret->binding() == elfcpp::STB_GNU_UNIQUE |
0602e05a ILT |
1016 | || ret->binding() == elfcpp::STB_WEAK) |
1017 | && !parameters->options().relocatable()) | |
1018 | this->force_local(ret); | |
1019 | ||
14bfc3f5 ILT |
1020 | return ret; |
1021 | } | |
1022 | ||
f6ce93d6 | 1023 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
1024 | |
1025 | template<int size, bool big_endian> | |
1026 | void | |
dbe717ef ILT |
1027 | Symbol_table::add_from_relobj( |
1028 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 1029 | const unsigned char* syms, |
14bfc3f5 | 1030 | size_t count, |
d491d34e | 1031 | size_t symndx_offset, |
14bfc3f5 ILT |
1032 | const char* sym_names, |
1033 | size_t sym_name_size, | |
92de84a6 ILT |
1034 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, |
1035 | size_t *defined) | |
14bfc3f5 | 1036 | { |
92de84a6 ILT |
1037 | *defined = 0; |
1038 | ||
8851ecca | 1039 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 1040 | |
a783673b ILT |
1041 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
1042 | ||
88dd47ac ILT |
1043 | const bool just_symbols = relobj->just_symbols(); |
1044 | ||
f6ce93d6 | 1045 | const unsigned char* p = syms; |
a783673b | 1046 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 1047 | { |
92de84a6 ILT |
1048 | (*sympointers)[i] = NULL; |
1049 | ||
14bfc3f5 ILT |
1050 | elfcpp::Sym<size, big_endian> sym(p); |
1051 | ||
d491d34e | 1052 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
1053 | if (st_name >= sym_name_size) |
1054 | { | |
75f2446e ILT |
1055 | relobj->error(_("bad global symbol name offset %u at %zu"), |
1056 | st_name, i); | |
1057 | continue; | |
14bfc3f5 ILT |
1058 | } |
1059 | ||
2ea97941 | 1060 | const char* name = sym_names + st_name; |
dbe717ef | 1061 | |
d491d34e ILT |
1062 | bool is_ordinary; |
1063 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
1064 | sym.get_st_shndx(), | |
1065 | &is_ordinary); | |
1066 | unsigned int orig_st_shndx = st_shndx; | |
1067 | if (!is_ordinary) | |
1068 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
1069 | ||
92de84a6 ILT |
1070 | if (st_shndx != elfcpp::SHN_UNDEF) |
1071 | ++*defined; | |
1072 | ||
a783673b ILT |
1073 | // A symbol defined in a section which we are not including must |
1074 | // be treated as an undefined symbol. | |
880cd20d | 1075 | bool is_defined_in_discarded_section = false; |
a783673b | 1076 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 1077 | && is_ordinary |
ce97fa81 ST |
1078 | && !relobj->is_section_included(st_shndx) |
1079 | && !this->is_section_folded(relobj, st_shndx)) | |
880cd20d ILT |
1080 | { |
1081 | st_shndx = elfcpp::SHN_UNDEF; | |
1082 | is_defined_in_discarded_section = true; | |
1083 | } | |
a783673b | 1084 | |
14bfc3f5 ILT |
1085 | // In an object file, an '@' in the name separates the symbol |
1086 | // name from the version name. If there are two '@' characters, | |
1087 | // this is the default version. | |
2ea97941 | 1088 | const char* ver = strchr(name, '@'); |
057ead22 | 1089 | Stringpool::Key ver_key = 0; |
09124467 | 1090 | int namelen = 0; |
8781f709 ILT |
1091 | // IS_DEFAULT_VERSION: is the version default? |
1092 | // IS_FORCED_LOCAL: is the symbol forced local? | |
1093 | bool is_default_version = false; | |
1094 | bool is_forced_local = false; | |
09124467 ILT |
1095 | |
1096 | if (ver != NULL) | |
1097 | { | |
1098 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
2ea97941 | 1099 | namelen = ver - name; |
09124467 ILT |
1100 | ++ver; |
1101 | if (*ver == '@') | |
1102 | { | |
8781f709 | 1103 | is_default_version = true; |
09124467 ILT |
1104 | ++ver; |
1105 | } | |
057ead22 | 1106 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 1107 | } |
5871526f ILT |
1108 | // We don't want to assign a version to an undefined symbol, |
1109 | // even if it is listed in the version script. FIXME: What | |
1110 | // about a common symbol? | |
057ead22 ILT |
1111 | else |
1112 | { | |
2ea97941 | 1113 | namelen = strlen(name); |
057ead22 ILT |
1114 | if (!this->version_script_.empty() |
1115 | && st_shndx != elfcpp::SHN_UNDEF) | |
1116 | { | |
1117 | // The symbol name did not have a version, but the | |
1118 | // version script may assign a version anyway. | |
2ea97941 | 1119 | std::string version; |
98e090bd ILT |
1120 | bool is_global; |
1121 | if (this->version_script_.get_symbol_version(name, &version, | |
1122 | &is_global)) | |
057ead22 | 1123 | { |
98e090bd ILT |
1124 | if (!is_global) |
1125 | is_forced_local = true; | |
1126 | else if (!version.empty()) | |
057ead22 | 1127 | { |
2ea97941 ILT |
1128 | ver = this->namepool_.add_with_length(version.c_str(), |
1129 | version.length(), | |
057ead22 ILT |
1130 | true, |
1131 | &ver_key); | |
8781f709 | 1132 | is_default_version = true; |
057ead22 ILT |
1133 | } |
1134 | } | |
057ead22 ILT |
1135 | } |
1136 | } | |
14bfc3f5 | 1137 | |
d491d34e ILT |
1138 | elfcpp::Sym<size, big_endian>* psym = &sym; |
1139 | unsigned char symbuf[sym_size]; | |
1140 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
1141 | if (just_symbols) |
1142 | { | |
d491d34e | 1143 | memcpy(symbuf, p, sym_size); |
88dd47ac | 1144 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
d491d34e | 1145 | if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary) |
88dd47ac ILT |
1146 | { |
1147 | // Symbol values in object files are section relative. | |
1148 | // This is normally what we want, but since here we are | |
1149 | // converting the symbol to absolute we need to add the | |
1150 | // section address. The section address in an object | |
1151 | // file is normally zero, but people can use a linker | |
1152 | // script to change it. | |
d491d34e ILT |
1153 | sw.put_st_value(sym.get_st_value() |
1154 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 1155 | } |
d491d34e ILT |
1156 | st_shndx = elfcpp::SHN_ABS; |
1157 | is_ordinary = false; | |
88dd47ac ILT |
1158 | psym = &sym2; |
1159 | } | |
1160 | ||
65514900 | 1161 | // Fix up visibility if object has no-export set. |
1c74fab0 ILT |
1162 | if (relobj->no_export() |
1163 | && (orig_st_shndx != elfcpp::SHN_UNDEF || !is_ordinary)) | |
65514900 CC |
1164 | { |
1165 | // We may have copied symbol already above. | |
1166 | if (psym != &sym2) | |
1167 | { | |
1168 | memcpy(symbuf, p, sym_size); | |
1169 | psym = &sym2; | |
1170 | } | |
1171 | ||
1172 | elfcpp::STV visibility = sym2.get_st_visibility(); | |
1173 | if (visibility == elfcpp::STV_DEFAULT | |
1174 | || visibility == elfcpp::STV_PROTECTED) | |
1175 | { | |
1176 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1177 | unsigned char nonvis = sym2.get_st_nonvis(); | |
1178 | sw.put_st_other(elfcpp::STV_HIDDEN, nonvis); | |
1179 | } | |
1180 | } | |
1181 | ||
057ead22 | 1182 | Stringpool::Key name_key; |
2ea97941 | 1183 | name = this->namepool_.add_with_length(name, namelen, true, |
057ead22 ILT |
1184 | &name_key); |
1185 | ||
aeddab66 | 1186 | Sized_symbol<size>* res; |
2ea97941 | 1187 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
8781f709 ILT |
1188 | is_default_version, *psym, st_shndx, |
1189 | is_ordinary, orig_st_shndx); | |
6d03d481 ST |
1190 | |
1191 | // If building a shared library using garbage collection, do not | |
1192 | // treat externally visible symbols as garbage. | |
1193 | if (parameters->options().gc_sections() | |
1194 | && parameters->options().shared()) | |
1195 | this->gc_mark_symbol_for_shlib(res); | |
f0641a0b | 1196 | |
8781f709 | 1197 | if (is_forced_local) |
057ead22 | 1198 | this->force_local(res); |
14bfc3f5 | 1199 | |
880cd20d ILT |
1200 | if (is_defined_in_discarded_section) |
1201 | res->set_is_defined_in_discarded_section(); | |
1202 | ||
730cdc88 | 1203 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
1204 | } |
1205 | } | |
1206 | ||
89fc3421 CC |
1207 | // Add a symbol from a plugin-claimed file. |
1208 | ||
1209 | template<int size, bool big_endian> | |
1210 | Symbol* | |
1211 | Symbol_table::add_from_pluginobj( | |
1212 | Sized_pluginobj<size, big_endian>* obj, | |
2ea97941 | 1213 | const char* name, |
89fc3421 CC |
1214 | const char* ver, |
1215 | elfcpp::Sym<size, big_endian>* sym) | |
1216 | { | |
1217 | unsigned int st_shndx = sym->get_st_shndx(); | |
24998053 | 1218 | bool is_ordinary = st_shndx < elfcpp::SHN_LORESERVE; |
89fc3421 CC |
1219 | |
1220 | Stringpool::Key ver_key = 0; | |
8781f709 ILT |
1221 | bool is_default_version = false; |
1222 | bool is_forced_local = false; | |
89fc3421 CC |
1223 | |
1224 | if (ver != NULL) | |
1225 | { | |
1226 | ver = this->namepool_.add(ver, true, &ver_key); | |
1227 | } | |
1228 | // We don't want to assign a version to an undefined symbol, | |
1229 | // even if it is listed in the version script. FIXME: What | |
1230 | // about a common symbol? | |
1231 | else | |
1232 | { | |
1233 | if (!this->version_script_.empty() | |
1234 | && st_shndx != elfcpp::SHN_UNDEF) | |
1235 | { | |
1236 | // The symbol name did not have a version, but the | |
1237 | // version script may assign a version anyway. | |
2ea97941 | 1238 | std::string version; |
98e090bd ILT |
1239 | bool is_global; |
1240 | if (this->version_script_.get_symbol_version(name, &version, | |
1241 | &is_global)) | |
89fc3421 | 1242 | { |
98e090bd ILT |
1243 | if (!is_global) |
1244 | is_forced_local = true; | |
1245 | else if (!version.empty()) | |
89fc3421 | 1246 | { |
2ea97941 ILT |
1247 | ver = this->namepool_.add_with_length(version.c_str(), |
1248 | version.length(), | |
89fc3421 CC |
1249 | true, |
1250 | &ver_key); | |
8781f709 | 1251 | is_default_version = true; |
89fc3421 CC |
1252 | } |
1253 | } | |
89fc3421 CC |
1254 | } |
1255 | } | |
1256 | ||
1257 | Stringpool::Key name_key; | |
2ea97941 | 1258 | name = this->namepool_.add(name, true, &name_key); |
89fc3421 CC |
1259 | |
1260 | Sized_symbol<size>* res; | |
2ea97941 | 1261 | res = this->add_from_object(obj, name, name_key, ver, ver_key, |
8781f709 ILT |
1262 | is_default_version, *sym, st_shndx, |
1263 | is_ordinary, st_shndx); | |
89fc3421 | 1264 | |
8781f709 | 1265 | if (is_forced_local) |
0602e05a | 1266 | this->force_local(res); |
89fc3421 CC |
1267 | |
1268 | return res; | |
1269 | } | |
1270 | ||
dbe717ef ILT |
1271 | // Add all the symbols in a dynamic object to the hash table. |
1272 | ||
1273 | template<int size, bool big_endian> | |
1274 | void | |
1275 | Symbol_table::add_from_dynobj( | |
1276 | Sized_dynobj<size, big_endian>* dynobj, | |
1277 | const unsigned char* syms, | |
1278 | size_t count, | |
1279 | const char* sym_names, | |
1280 | size_t sym_name_size, | |
1281 | const unsigned char* versym, | |
1282 | size_t versym_size, | |
92de84a6 ILT |
1283 | const std::vector<const char*>* version_map, |
1284 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, | |
1285 | size_t* defined) | |
dbe717ef | 1286 | { |
92de84a6 ILT |
1287 | *defined = 0; |
1288 | ||
8851ecca | 1289 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1290 | |
88dd47ac ILT |
1291 | if (dynobj->just_symbols()) |
1292 | { | |
1293 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1294 | return; | |
1295 | } | |
1296 | ||
dbe717ef ILT |
1297 | if (versym != NULL && versym_size / 2 < count) |
1298 | { | |
75f2446e ILT |
1299 | dynobj->error(_("too few symbol versions")); |
1300 | return; | |
dbe717ef ILT |
1301 | } |
1302 | ||
1303 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1304 | ||
aeddab66 ILT |
1305 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1306 | // weak aliases. This is necessary because if the dynamic object | |
1307 | // provides the same variable under two names, one of which is a | |
1308 | // weak definition, and the regular object refers to the weak | |
1309 | // definition, we have to put both the weak definition and the | |
1310 | // strong definition into the dynamic symbol table. Given a weak | |
1311 | // definition, the only way that we can find the corresponding | |
1312 | // strong definition, if any, is to search the symbol table. | |
1313 | std::vector<Sized_symbol<size>*> object_symbols; | |
1314 | ||
dbe717ef ILT |
1315 | const unsigned char* p = syms; |
1316 | const unsigned char* vs = versym; | |
1317 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1318 | { | |
1319 | elfcpp::Sym<size, big_endian> sym(p); | |
1320 | ||
92de84a6 ILT |
1321 | if (sympointers != NULL) |
1322 | (*sympointers)[i] = NULL; | |
1323 | ||
65778909 ILT |
1324 | // Ignore symbols with local binding or that have |
1325 | // internal or hidden visibility. | |
1326 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1327 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1328 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1329 | continue; |
1330 | ||
8bdcdf2c ILT |
1331 | // A protected symbol in a shared library must be treated as a |
1332 | // normal symbol when viewed from outside the shared library. | |
1333 | // Implement this by overriding the visibility here. | |
1334 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1335 | unsigned char symbuf[sym_size]; | |
1336 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1337 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1338 | { | |
1339 | memcpy(symbuf, p, sym_size); | |
1340 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1341 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1342 | psym = &sym2; | |
1343 | } | |
1344 | ||
1345 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1346 | if (st_name >= sym_name_size) |
1347 | { | |
75f2446e ILT |
1348 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1349 | st_name, i); | |
1350 | continue; | |
dbe717ef ILT |
1351 | } |
1352 | ||
2ea97941 | 1353 | const char* name = sym_names + st_name; |
dbe717ef | 1354 | |
d491d34e | 1355 | bool is_ordinary; |
8bdcdf2c | 1356 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1357 | &is_ordinary); |
1358 | ||
92de84a6 ILT |
1359 | if (st_shndx != elfcpp::SHN_UNDEF) |
1360 | ++*defined; | |
1361 | ||
aeddab66 ILT |
1362 | Sized_symbol<size>* res; |
1363 | ||
dbe717ef ILT |
1364 | if (versym == NULL) |
1365 | { | |
1366 | Stringpool::Key name_key; | |
2ea97941 ILT |
1367 | name = this->namepool_.add(name, true, &name_key); |
1368 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1369 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1370 | st_shndx); |
dbe717ef | 1371 | } |
aeddab66 ILT |
1372 | else |
1373 | { | |
1374 | // Read the version information. | |
dbe717ef | 1375 | |
aeddab66 | 1376 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1377 | |
aeddab66 ILT |
1378 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1379 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1380 | |
aeddab66 ILT |
1381 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1382 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1383 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1384 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1385 | // for an undefined symbol. I don't know what the Sun | |
1386 | // linker will generate. | |
dbe717ef | 1387 | |
aeddab66 | 1388 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1389 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1390 | { |
1391 | // This symbol should not be visible outside the object. | |
1392 | continue; | |
1393 | } | |
64707334 | 1394 | |
aeddab66 ILT |
1395 | // At this point we are definitely going to add this symbol. |
1396 | Stringpool::Key name_key; | |
2ea97941 | 1397 | name = this->namepool_.add(name, true, &name_key); |
dbe717ef | 1398 | |
aeddab66 ILT |
1399 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1400 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1401 | { | |
1402 | // This symbol does not have a version. | |
2ea97941 | 1403 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1404 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1405 | st_shndx); |
aeddab66 ILT |
1406 | } |
1407 | else | |
1408 | { | |
1409 | if (v >= version_map->size()) | |
1410 | { | |
1411 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1412 | i, v); | |
1413 | continue; | |
1414 | } | |
dbe717ef | 1415 | |
2ea97941 ILT |
1416 | const char* version = (*version_map)[v]; |
1417 | if (version == NULL) | |
aeddab66 ILT |
1418 | { |
1419 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1420 | i, v); | |
1421 | continue; | |
1422 | } | |
dbe717ef | 1423 | |
aeddab66 | 1424 | Stringpool::Key version_key; |
2ea97941 | 1425 | version = this->namepool_.add(version, true, &version_key); |
aeddab66 ILT |
1426 | |
1427 | // If this is an absolute symbol, and the version name | |
1428 | // and symbol name are the same, then this is the | |
1429 | // version definition symbol. These symbols exist to | |
1430 | // support using -u to pull in particular versions. We | |
1431 | // do not want to record a version for them. | |
d491d34e ILT |
1432 | if (st_shndx == elfcpp::SHN_ABS |
1433 | && !is_ordinary | |
aeddab66 | 1434 | && name_key == version_key) |
2ea97941 | 1435 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1436 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1437 | st_shndx); |
aeddab66 ILT |
1438 | else |
1439 | { | |
8781f709 ILT |
1440 | const bool is_default_version = |
1441 | !hidden && st_shndx != elfcpp::SHN_UNDEF; | |
2ea97941 | 1442 | res = this->add_from_object(dynobj, name, name_key, version, |
8781f709 ILT |
1443 | version_key, is_default_version, |
1444 | *psym, st_shndx, | |
d491d34e | 1445 | is_ordinary, st_shndx); |
aeddab66 ILT |
1446 | } |
1447 | } | |
dbe717ef ILT |
1448 | } |
1449 | ||
99a37bfd | 1450 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1451 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1452 | if (st_shndx != elfcpp::SHN_UNDEF |
1453 | && is_ordinary | |
8bdcdf2c | 1454 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1455 | && res->source() == Symbol::FROM_OBJECT |
1456 | && res->object() == dynobj) | |
aeddab66 | 1457 | object_symbols.push_back(res); |
92de84a6 ILT |
1458 | |
1459 | if (sympointers != NULL) | |
1460 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1461 | } |
1462 | ||
1463 | this->record_weak_aliases(&object_symbols); | |
1464 | } | |
1465 | ||
1466 | // This is used to sort weak aliases. We sort them first by section | |
1467 | // index, then by offset, then by weak ahead of strong. | |
1468 | ||
1469 | template<int size> | |
1470 | class Weak_alias_sorter | |
1471 | { | |
1472 | public: | |
1473 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1474 | }; | |
1475 | ||
1476 | template<int size> | |
1477 | bool | |
1478 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1479 | const Sized_symbol<size>* s2) const | |
1480 | { | |
d491d34e ILT |
1481 | bool is_ordinary; |
1482 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1483 | gold_assert(is_ordinary); | |
1484 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1485 | gold_assert(is_ordinary); | |
1486 | if (s1_shndx != s2_shndx) | |
1487 | return s1_shndx < s2_shndx; | |
1488 | ||
aeddab66 ILT |
1489 | if (s1->value() != s2->value()) |
1490 | return s1->value() < s2->value(); | |
1491 | if (s1->binding() != s2->binding()) | |
1492 | { | |
1493 | if (s1->binding() == elfcpp::STB_WEAK) | |
1494 | return true; | |
1495 | if (s2->binding() == elfcpp::STB_WEAK) | |
1496 | return false; | |
1497 | } | |
1498 | return std::string(s1->name()) < std::string(s2->name()); | |
1499 | } | |
dbe717ef | 1500 | |
aeddab66 ILT |
1501 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1502 | // for any weak aliases, and record them so that if we add the weak | |
1503 | // alias to the dynamic symbol table, we also add the corresponding | |
1504 | // strong symbol. | |
dbe717ef | 1505 | |
aeddab66 ILT |
1506 | template<int size> |
1507 | void | |
1508 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1509 | { | |
1510 | // Sort the vector by section index, then by offset, then by weak | |
1511 | // ahead of strong. | |
1512 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1513 | ||
1514 | // Walk through the vector. For each weak definition, record | |
1515 | // aliases. | |
1516 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1517 | symbols->begin(); | |
1518 | p != symbols->end(); | |
1519 | ++p) | |
1520 | { | |
1521 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1522 | continue; | |
1523 | ||
1524 | // Build a circular list of weak aliases. Each symbol points to | |
1525 | // the next one in the circular list. | |
1526 | ||
1527 | Sized_symbol<size>* from_sym = *p; | |
1528 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1529 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1530 | { |
d491d34e ILT |
1531 | bool dummy; |
1532 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1533 | || (*q)->value() != from_sym->value()) |
1534 | break; | |
1535 | ||
1536 | this->weak_aliases_[from_sym] = *q; | |
1537 | from_sym->set_has_alias(); | |
1538 | from_sym = *q; | |
dbe717ef ILT |
1539 | } |
1540 | ||
aeddab66 ILT |
1541 | if (from_sym != *p) |
1542 | { | |
1543 | this->weak_aliases_[from_sym] = *p; | |
1544 | from_sym->set_has_alias(); | |
1545 | } | |
dbe717ef | 1546 | |
aeddab66 | 1547 | p = q - 1; |
dbe717ef ILT |
1548 | } |
1549 | } | |
1550 | ||
ead1e424 ILT |
1551 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1552 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1553 | // If this does not return NULL, it sets *POLDSYM to the existing |
8c500701 ILT |
1554 | // symbol if there is one. This sets *RESOLVE_OLDSYM if we should |
1555 | // resolve the newly created symbol to the old one. This | |
1556 | // canonicalizes *PNAME and *PVERSION. | |
ead1e424 ILT |
1557 | |
1558 | template<int size, bool big_endian> | |
1559 | Sized_symbol<size>* | |
9b07f471 ILT |
1560 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1561 | bool only_if_ref, | |
8c500701 ILT |
1562 | Sized_symbol<size>** poldsym, |
1563 | bool *resolve_oldsym) | |
ead1e424 | 1564 | { |
8c500701 | 1565 | *resolve_oldsym = false; |
ead1e424 | 1566 | |
55a93433 ILT |
1567 | // If the caller didn't give us a version, see if we get one from |
1568 | // the version script. | |
057ead22 | 1569 | std::string v; |
8c500701 | 1570 | bool is_default_version = false; |
55a93433 ILT |
1571 | if (*pversion == NULL) |
1572 | { | |
98e090bd ILT |
1573 | bool is_global; |
1574 | if (this->version_script_.get_symbol_version(*pname, &v, &is_global)) | |
057ead22 | 1575 | { |
98e090bd ILT |
1576 | if (is_global && !v.empty()) |
1577 | { | |
1578 | *pversion = v.c_str(); | |
1579 | // If we get the version from a version script, then we | |
1580 | // are also the default version. | |
1581 | is_default_version = true; | |
1582 | } | |
057ead22 | 1583 | } |
55a93433 ILT |
1584 | } |
1585 | ||
8c500701 ILT |
1586 | Symbol* oldsym; |
1587 | Sized_symbol<size>* sym; | |
1588 | ||
1589 | bool add_to_table = false; | |
1590 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
1591 | bool add_def_to_table = false; | |
1592 | typename Symbol_table_type::iterator add_def_loc = this->table_.end(); | |
1593 | ||
ead1e424 ILT |
1594 | if (only_if_ref) |
1595 | { | |
306d9ef0 | 1596 | oldsym = this->lookup(*pname, *pversion); |
8c500701 ILT |
1597 | if (oldsym == NULL && is_default_version) |
1598 | oldsym = this->lookup(*pname, NULL); | |
f6ce93d6 | 1599 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1600 | return NULL; |
306d9ef0 ILT |
1601 | |
1602 | *pname = oldsym->name(); | |
8c500701 ILT |
1603 | if (!is_default_version) |
1604 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1605 | } |
1606 | else | |
1607 | { | |
14b31740 | 1608 | // Canonicalize NAME and VERSION. |
f0641a0b | 1609 | Stringpool::Key name_key; |
cfd73a4e | 1610 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1611 | |
14b31740 | 1612 | Stringpool::Key version_key = 0; |
306d9ef0 | 1613 | if (*pversion != NULL) |
cfd73a4e | 1614 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1615 | |
ead1e424 | 1616 | Symbol* const snull = NULL; |
ead1e424 | 1617 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1618 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1619 | version_key), | |
ead1e424 ILT |
1620 | snull)); |
1621 | ||
8781f709 | 1622 | std::pair<typename Symbol_table_type::iterator, bool> insdefault = |
8c500701 ILT |
1623 | std::make_pair(this->table_.end(), false); |
1624 | if (is_default_version) | |
1625 | { | |
1626 | const Stringpool::Key vnull = 0; | |
8781f709 ILT |
1627 | insdefault = |
1628 | this->table_.insert(std::make_pair(std::make_pair(name_key, | |
1629 | vnull), | |
1630 | snull)); | |
8c500701 ILT |
1631 | } |
1632 | ||
ead1e424 ILT |
1633 | if (!ins.second) |
1634 | { | |
14b31740 | 1635 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1636 | oldsym = ins.first->second; |
a3ad94ed | 1637 | gold_assert(oldsym != NULL); |
8c500701 ILT |
1638 | |
1639 | if (is_default_version) | |
1640 | { | |
1641 | Sized_symbol<size>* soldsym = | |
1642 | this->get_sized_symbol<size>(oldsym); | |
1643 | this->define_default_version<size, big_endian>(soldsym, | |
8781f709 ILT |
1644 | insdefault.second, |
1645 | insdefault.first); | |
8c500701 | 1646 | } |
ead1e424 ILT |
1647 | } |
1648 | else | |
1649 | { | |
1650 | // We haven't seen this symbol before. | |
a3ad94ed | 1651 | gold_assert(ins.first->second == NULL); |
8c500701 ILT |
1652 | |
1653 | add_to_table = true; | |
1654 | add_loc = ins.first; | |
1655 | ||
8781f709 | 1656 | if (is_default_version && !insdefault.second) |
8c500701 ILT |
1657 | { |
1658 | // We are adding NAME/VERSION, and it is the default | |
1659 | // version. We already have an entry for NAME/NULL. | |
8781f709 | 1660 | oldsym = insdefault.first->second; |
8c500701 ILT |
1661 | *resolve_oldsym = true; |
1662 | } | |
1663 | else | |
1664 | { | |
1665 | oldsym = NULL; | |
1666 | ||
1667 | if (is_default_version) | |
1668 | { | |
1669 | add_def_to_table = true; | |
8781f709 | 1670 | add_def_loc = insdefault.first; |
8c500701 ILT |
1671 | } |
1672 | } | |
ead1e424 ILT |
1673 | } |
1674 | } | |
1675 | ||
8851ecca ILT |
1676 | const Target& target = parameters->target(); |
1677 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1678 | sym = new Sized_symbol<size>(); |
1679 | else | |
ead1e424 | 1680 | { |
029ba973 ILT |
1681 | Sized_target<size, big_endian>* sized_target = |
1682 | parameters->sized_target<size, big_endian>(); | |
86f2e683 ILT |
1683 | sym = sized_target->make_symbol(); |
1684 | if (sym == NULL) | |
1685 | return NULL; | |
1686 | } | |
ead1e424 | 1687 | |
86f2e683 ILT |
1688 | if (add_to_table) |
1689 | add_loc->second = sym; | |
1690 | else | |
1691 | gold_assert(oldsym != NULL); | |
ead1e424 | 1692 | |
8c500701 ILT |
1693 | if (add_def_to_table) |
1694 | add_def_loc->second = sym; | |
1695 | ||
7d1a9ebb | 1696 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1697 | |
1698 | return sym; | |
1699 | } | |
1700 | ||
1701 | // Define a symbol based on an Output_data. | |
1702 | ||
14b31740 | 1703 | Symbol* |
2ea97941 ILT |
1704 | Symbol_table::define_in_output_data(const char* name, |
1705 | const char* version, | |
99fff23b | 1706 | Defined defined, |
9b07f471 | 1707 | Output_data* od, |
2ea97941 ILT |
1708 | uint64_t value, |
1709 | uint64_t symsize, | |
9b07f471 ILT |
1710 | elfcpp::STT type, |
1711 | elfcpp::STB binding, | |
ead1e424 ILT |
1712 | elfcpp::STV visibility, |
1713 | unsigned char nonvis, | |
2ea97941 | 1714 | bool offset_is_from_end, |
ead1e424 ILT |
1715 | bool only_if_ref) |
1716 | { | |
8851ecca | 1717 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1718 | { |
1719 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1720 | return this->do_define_in_output_data<32>(name, version, defined, od, |
2ea97941 | 1721 | value, symsize, type, binding, |
86f2e683 | 1722 | visibility, nonvis, |
2ea97941 | 1723 | offset_is_from_end, |
86f2e683 ILT |
1724 | only_if_ref); |
1725 | #else | |
1726 | gold_unreachable(); | |
1727 | #endif | |
1728 | } | |
8851ecca | 1729 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1730 | { |
1731 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1732 | return this->do_define_in_output_data<64>(name, version, defined, od, |
2ea97941 | 1733 | value, symsize, type, binding, |
86f2e683 | 1734 | visibility, nonvis, |
2ea97941 | 1735 | offset_is_from_end, |
86f2e683 ILT |
1736 | only_if_ref); |
1737 | #else | |
1738 | gold_unreachable(); | |
1739 | #endif | |
1740 | } | |
ead1e424 | 1741 | else |
a3ad94ed | 1742 | gold_unreachable(); |
ead1e424 ILT |
1743 | } |
1744 | ||
1745 | // Define a symbol in an Output_data, sized version. | |
1746 | ||
1747 | template<int size> | |
14b31740 | 1748 | Sized_symbol<size>* |
ead1e424 | 1749 | Symbol_table::do_define_in_output_data( |
2ea97941 ILT |
1750 | const char* name, |
1751 | const char* version, | |
99fff23b | 1752 | Defined defined, |
ead1e424 | 1753 | Output_data* od, |
2ea97941 ILT |
1754 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1755 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1756 | elfcpp::STT type, |
1757 | elfcpp::STB binding, | |
1758 | elfcpp::STV visibility, | |
1759 | unsigned char nonvis, | |
2ea97941 | 1760 | bool offset_is_from_end, |
ead1e424 ILT |
1761 | bool only_if_ref) |
1762 | { | |
1763 | Sized_symbol<size>* sym; | |
86f2e683 | 1764 | Sized_symbol<size>* oldsym; |
8c500701 | 1765 | bool resolve_oldsym; |
ead1e424 | 1766 | |
8851ecca | 1767 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1768 | { |
1769 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1770 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1771 | only_if_ref, &oldsym, |
1772 | &resolve_oldsym); | |
193a53d9 ILT |
1773 | #else |
1774 | gold_unreachable(); | |
1775 | #endif | |
1776 | } | |
ead1e424 | 1777 | else |
193a53d9 ILT |
1778 | { |
1779 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1780 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1781 | only_if_ref, &oldsym, |
1782 | &resolve_oldsym); | |
193a53d9 ILT |
1783 | #else |
1784 | gold_unreachable(); | |
1785 | #endif | |
1786 | } | |
ead1e424 ILT |
1787 | |
1788 | if (sym == NULL) | |
14b31740 | 1789 | return NULL; |
ead1e424 | 1790 | |
2ea97941 ILT |
1791 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
1792 | visibility, nonvis, offset_is_from_end); | |
14b31740 | 1793 | |
e5756efb | 1794 | if (oldsym == NULL) |
55a93433 ILT |
1795 | { |
1796 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1797 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1798 | this->force_local(sym); |
2ea97941 | 1799 | else if (version != NULL) |
75517b77 | 1800 | sym->set_is_default(); |
55a93433 ILT |
1801 | return sym; |
1802 | } | |
86f2e683 | 1803 | |
99fff23b | 1804 | if (Symbol_table::should_override_with_special(oldsym, defined)) |
e5756efb | 1805 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1806 | |
1807 | if (resolve_oldsym) | |
1808 | return sym; | |
1809 | else | |
1810 | { | |
1811 | delete sym; | |
1812 | return oldsym; | |
1813 | } | |
ead1e424 ILT |
1814 | } |
1815 | ||
1816 | // Define a symbol based on an Output_segment. | |
1817 | ||
14b31740 | 1818 | Symbol* |
2ea97941 | 1819 | Symbol_table::define_in_output_segment(const char* name, |
99fff23b ILT |
1820 | const char* version, |
1821 | Defined defined, | |
1822 | Output_segment* os, | |
2ea97941 ILT |
1823 | uint64_t value, |
1824 | uint64_t symsize, | |
9b07f471 ILT |
1825 | elfcpp::STT type, |
1826 | elfcpp::STB binding, | |
ead1e424 ILT |
1827 | elfcpp::STV visibility, |
1828 | unsigned char nonvis, | |
2ea97941 | 1829 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
1830 | bool only_if_ref) |
1831 | { | |
8851ecca | 1832 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1833 | { |
1834 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1835 | return this->do_define_in_output_segment<32>(name, version, defined, os, |
2ea97941 | 1836 | value, symsize, type, |
86f2e683 | 1837 | binding, visibility, nonvis, |
2ea97941 | 1838 | offset_base, only_if_ref); |
86f2e683 ILT |
1839 | #else |
1840 | gold_unreachable(); | |
1841 | #endif | |
1842 | } | |
8851ecca | 1843 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1844 | { |
1845 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1846 | return this->do_define_in_output_segment<64>(name, version, defined, os, |
2ea97941 | 1847 | value, symsize, type, |
86f2e683 | 1848 | binding, visibility, nonvis, |
2ea97941 | 1849 | offset_base, only_if_ref); |
86f2e683 ILT |
1850 | #else |
1851 | gold_unreachable(); | |
1852 | #endif | |
1853 | } | |
ead1e424 | 1854 | else |
a3ad94ed | 1855 | gold_unreachable(); |
ead1e424 ILT |
1856 | } |
1857 | ||
1858 | // Define a symbol in an Output_segment, sized version. | |
1859 | ||
1860 | template<int size> | |
14b31740 | 1861 | Sized_symbol<size>* |
ead1e424 | 1862 | Symbol_table::do_define_in_output_segment( |
2ea97941 ILT |
1863 | const char* name, |
1864 | const char* version, | |
99fff23b | 1865 | Defined defined, |
ead1e424 | 1866 | Output_segment* os, |
2ea97941 ILT |
1867 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1868 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1869 | elfcpp::STT type, |
1870 | elfcpp::STB binding, | |
1871 | elfcpp::STV visibility, | |
1872 | unsigned char nonvis, | |
2ea97941 | 1873 | Symbol::Segment_offset_base offset_base, |
ead1e424 ILT |
1874 | bool only_if_ref) |
1875 | { | |
1876 | Sized_symbol<size>* sym; | |
86f2e683 | 1877 | Sized_symbol<size>* oldsym; |
8c500701 | 1878 | bool resolve_oldsym; |
ead1e424 | 1879 | |
8851ecca | 1880 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1881 | { |
1882 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1883 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1884 | only_if_ref, &oldsym, |
1885 | &resolve_oldsym); | |
9025d29d ILT |
1886 | #else |
1887 | gold_unreachable(); | |
1888 | #endif | |
1889 | } | |
ead1e424 | 1890 | else |
9025d29d ILT |
1891 | { |
1892 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 1893 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
1894 | only_if_ref, &oldsym, |
1895 | &resolve_oldsym); | |
9025d29d ILT |
1896 | #else |
1897 | gold_unreachable(); | |
1898 | #endif | |
1899 | } | |
ead1e424 ILT |
1900 | |
1901 | if (sym == NULL) | |
14b31740 | 1902 | return NULL; |
ead1e424 | 1903 | |
2ea97941 ILT |
1904 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
1905 | visibility, nonvis, offset_base); | |
14b31740 | 1906 | |
e5756efb | 1907 | if (oldsym == NULL) |
55a93433 ILT |
1908 | { |
1909 | if (binding == elfcpp::STB_LOCAL | |
2ea97941 | 1910 | || this->version_script_.symbol_is_local(name)) |
55a93433 | 1911 | this->force_local(sym); |
2ea97941 | 1912 | else if (version != NULL) |
75517b77 | 1913 | sym->set_is_default(); |
55a93433 ILT |
1914 | return sym; |
1915 | } | |
86f2e683 | 1916 | |
99fff23b | 1917 | if (Symbol_table::should_override_with_special(oldsym, defined)) |
e5756efb | 1918 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
1919 | |
1920 | if (resolve_oldsym) | |
1921 | return sym; | |
1922 | else | |
1923 | { | |
1924 | delete sym; | |
1925 | return oldsym; | |
1926 | } | |
ead1e424 ILT |
1927 | } |
1928 | ||
1929 | // Define a special symbol with a constant value. It is a multiple | |
1930 | // definition error if this symbol is already defined. | |
1931 | ||
14b31740 | 1932 | Symbol* |
2ea97941 ILT |
1933 | Symbol_table::define_as_constant(const char* name, |
1934 | const char* version, | |
99fff23b | 1935 | Defined defined, |
2ea97941 ILT |
1936 | uint64_t value, |
1937 | uint64_t symsize, | |
9b07f471 ILT |
1938 | elfcpp::STT type, |
1939 | elfcpp::STB binding, | |
1940 | elfcpp::STV visibility, | |
1941 | unsigned char nonvis, | |
caa9d5d9 ILT |
1942 | bool only_if_ref, |
1943 | bool force_override) | |
ead1e424 | 1944 | { |
8851ecca | 1945 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1946 | { |
1947 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
99fff23b | 1948 | return this->do_define_as_constant<32>(name, version, defined, value, |
2ea97941 | 1949 | symsize, type, binding, |
caa9d5d9 ILT |
1950 | visibility, nonvis, only_if_ref, |
1951 | force_override); | |
86f2e683 ILT |
1952 | #else |
1953 | gold_unreachable(); | |
1954 | #endif | |
1955 | } | |
8851ecca | 1956 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1957 | { |
1958 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
99fff23b | 1959 | return this->do_define_as_constant<64>(name, version, defined, value, |
2ea97941 | 1960 | symsize, type, binding, |
caa9d5d9 ILT |
1961 | visibility, nonvis, only_if_ref, |
1962 | force_override); | |
86f2e683 ILT |
1963 | #else |
1964 | gold_unreachable(); | |
1965 | #endif | |
1966 | } | |
ead1e424 | 1967 | else |
a3ad94ed | 1968 | gold_unreachable(); |
ead1e424 ILT |
1969 | } |
1970 | ||
1971 | // Define a symbol as a constant, sized version. | |
1972 | ||
1973 | template<int size> | |
14b31740 | 1974 | Sized_symbol<size>* |
ead1e424 | 1975 | Symbol_table::do_define_as_constant( |
2ea97941 ILT |
1976 | const char* name, |
1977 | const char* version, | |
99fff23b | 1978 | Defined defined, |
2ea97941 ILT |
1979 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1980 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
ead1e424 ILT |
1981 | elfcpp::STT type, |
1982 | elfcpp::STB binding, | |
1983 | elfcpp::STV visibility, | |
1984 | unsigned char nonvis, | |
caa9d5d9 ILT |
1985 | bool only_if_ref, |
1986 | bool force_override) | |
ead1e424 ILT |
1987 | { |
1988 | Sized_symbol<size>* sym; | |
86f2e683 | 1989 | Sized_symbol<size>* oldsym; |
8c500701 | 1990 | bool resolve_oldsym; |
ead1e424 | 1991 | |
8851ecca | 1992 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1993 | { |
1994 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 1995 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
1996 | only_if_ref, &oldsym, |
1997 | &resolve_oldsym); | |
9025d29d ILT |
1998 | #else |
1999 | gold_unreachable(); | |
2000 | #endif | |
2001 | } | |
ead1e424 | 2002 | else |
9025d29d ILT |
2003 | { |
2004 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2005 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2006 | only_if_ref, &oldsym, |
2007 | &resolve_oldsym); | |
9025d29d ILT |
2008 | #else |
2009 | gold_unreachable(); | |
2010 | #endif | |
2011 | } | |
ead1e424 ILT |
2012 | |
2013 | if (sym == NULL) | |
14b31740 | 2014 | return NULL; |
ead1e424 | 2015 | |
2ea97941 | 2016 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
75517b77 | 2017 | nonvis); |
14b31740 | 2018 | |
e5756efb | 2019 | if (oldsym == NULL) |
55a93433 | 2020 | { |
686c8caf ILT |
2021 | // Version symbols are absolute symbols with name == version. |
2022 | // We don't want to force them to be local. | |
2ea97941 ILT |
2023 | if ((version == NULL |
2024 | || name != version | |
2025 | || value != 0) | |
686c8caf | 2026 | && (binding == elfcpp::STB_LOCAL |
2ea97941 | 2027 | || this->version_script_.symbol_is_local(name))) |
55a93433 | 2028 | this->force_local(sym); |
2ea97941 ILT |
2029 | else if (version != NULL |
2030 | && (name != version || value != 0)) | |
75517b77 | 2031 | sym->set_is_default(); |
55a93433 ILT |
2032 | return sym; |
2033 | } | |
86f2e683 | 2034 | |
99fff23b ILT |
2035 | if (force_override |
2036 | || Symbol_table::should_override_with_special(oldsym, defined)) | |
e5756efb | 2037 | this->override_with_special(oldsym, sym); |
8c500701 ILT |
2038 | |
2039 | if (resolve_oldsym) | |
2040 | return sym; | |
2041 | else | |
2042 | { | |
2043 | delete sym; | |
2044 | return oldsym; | |
2045 | } | |
ead1e424 ILT |
2046 | } |
2047 | ||
2048 | // Define a set of symbols in output sections. | |
2049 | ||
2050 | void | |
9b07f471 | 2051 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2052 | const Define_symbol_in_section* p, |
2053 | bool only_if_ref) | |
ead1e424 ILT |
2054 | { |
2055 | for (int i = 0; i < count; ++i, ++p) | |
2056 | { | |
2057 | Output_section* os = layout->find_output_section(p->output_section); | |
2058 | if (os != NULL) | |
99fff23b | 2059 | this->define_in_output_data(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2060 | p->size, p->type, p->binding, |
2061 | p->visibility, p->nonvis, | |
a445fddf ILT |
2062 | p->offset_is_from_end, |
2063 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2064 | else |
99fff23b ILT |
2065 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2066 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2067 | only_if_ref || p->only_if_ref, |
2068 | false); | |
ead1e424 ILT |
2069 | } |
2070 | } | |
2071 | ||
2072 | // Define a set of symbols in output segments. | |
2073 | ||
2074 | void | |
9b07f471 | 2075 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
2076 | const Define_symbol_in_segment* p, |
2077 | bool only_if_ref) | |
ead1e424 ILT |
2078 | { |
2079 | for (int i = 0; i < count; ++i, ++p) | |
2080 | { | |
2081 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
2082 | p->segment_flags_set, | |
2083 | p->segment_flags_clear); | |
2084 | if (os != NULL) | |
99fff23b | 2085 | this->define_in_output_segment(p->name, NULL, PREDEFINED, os, p->value, |
14b31740 ILT |
2086 | p->size, p->type, p->binding, |
2087 | p->visibility, p->nonvis, | |
a445fddf ILT |
2088 | p->offset_base, |
2089 | only_if_ref || p->only_if_ref); | |
ead1e424 | 2090 | else |
99fff23b ILT |
2091 | this->define_as_constant(p->name, NULL, PREDEFINED, 0, p->size, |
2092 | p->type, p->binding, p->visibility, p->nonvis, | |
caa9d5d9 ILT |
2093 | only_if_ref || p->only_if_ref, |
2094 | false); | |
ead1e424 ILT |
2095 | } |
2096 | } | |
2097 | ||
46fe1623 ILT |
2098 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
2099 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
2100 | // the offset within POSD. | |
2101 | ||
2102 | template<int size> | |
2103 | void | |
fe8718a4 | 2104 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
2105 | Sized_symbol<size>* csym, |
2106 | Output_data* posd, | |
2ea97941 | 2107 | typename elfcpp::Elf_types<size>::Elf_Addr value) |
46fe1623 ILT |
2108 | { |
2109 | gold_assert(csym->is_from_dynobj()); | |
2110 | gold_assert(!csym->is_copied_from_dynobj()); | |
2ea97941 ILT |
2111 | Object* object = csym->object(); |
2112 | gold_assert(object->is_dynamic()); | |
2113 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
46fe1623 ILT |
2114 | |
2115 | // Our copied variable has to override any variable in a shared | |
2116 | // library. | |
2117 | elfcpp::STB binding = csym->binding(); | |
2118 | if (binding == elfcpp::STB_WEAK) | |
2119 | binding = elfcpp::STB_GLOBAL; | |
2120 | ||
99fff23b | 2121 | this->define_in_output_data(csym->name(), csym->version(), COPY, |
2ea97941 | 2122 | posd, value, csym->symsize(), |
46fe1623 ILT |
2123 | csym->type(), binding, |
2124 | csym->visibility(), csym->nonvis(), | |
2125 | false, false); | |
2126 | ||
2127 | csym->set_is_copied_from_dynobj(); | |
2128 | csym->set_needs_dynsym_entry(); | |
2129 | ||
2130 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
2131 | ||
2132 | // We have now defined all aliases, but we have not entered them all | |
2133 | // in the copied_symbol_dynobjs_ map. | |
2134 | if (csym->has_alias()) | |
2135 | { | |
2136 | Symbol* sym = csym; | |
2137 | while (true) | |
2138 | { | |
2139 | sym = this->weak_aliases_[sym]; | |
2140 | if (sym == csym) | |
2141 | break; | |
2142 | gold_assert(sym->output_data() == posd); | |
2143 | ||
2144 | sym->set_is_copied_from_dynobj(); | |
2145 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
2146 | } | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
2151 | // the original definition was found. | |
2152 | ||
2153 | Dynobj* | |
2154 | Symbol_table::get_copy_source(const Symbol* sym) const | |
2155 | { | |
2156 | gold_assert(sym->is_copied_from_dynobj()); | |
2157 | Copied_symbol_dynobjs::const_iterator p = | |
2158 | this->copied_symbol_dynobjs_.find(sym); | |
2159 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
2160 | return p->second; | |
2161 | } | |
2162 | ||
f3e9c5c5 ILT |
2163 | // Add any undefined symbols named on the command line. |
2164 | ||
2165 | void | |
2166 | Symbol_table::add_undefined_symbols_from_command_line() | |
2167 | { | |
2168 | if (parameters->options().any_undefined()) | |
2169 | { | |
2170 | if (parameters->target().get_size() == 32) | |
2171 | { | |
5adf9721 | 2172 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
f3e9c5c5 ILT |
2173 | this->do_add_undefined_symbols_from_command_line<32>(); |
2174 | #else | |
2175 | gold_unreachable(); | |
2176 | #endif | |
2177 | } | |
2178 | else if (parameters->target().get_size() == 64) | |
2179 | { | |
2180 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2181 | this->do_add_undefined_symbols_from_command_line<64>(); | |
2182 | #else | |
2183 | gold_unreachable(); | |
2184 | #endif | |
2185 | } | |
2186 | else | |
2187 | gold_unreachable(); | |
2188 | } | |
2189 | } | |
2190 | ||
2191 | template<int size> | |
2192 | void | |
2193 | Symbol_table::do_add_undefined_symbols_from_command_line() | |
2194 | { | |
2195 | for (options::String_set::const_iterator p = | |
2196 | parameters->options().undefined_begin(); | |
2197 | p != parameters->options().undefined_end(); | |
2198 | ++p) | |
2199 | { | |
2ea97941 | 2200 | const char* name = p->c_str(); |
f3e9c5c5 | 2201 | |
2ea97941 | 2202 | if (this->lookup(name) != NULL) |
f3e9c5c5 ILT |
2203 | continue; |
2204 | ||
2ea97941 | 2205 | const char* version = NULL; |
f3e9c5c5 ILT |
2206 | |
2207 | Sized_symbol<size>* sym; | |
2208 | Sized_symbol<size>* oldsym; | |
8c500701 | 2209 | bool resolve_oldsym; |
f3e9c5c5 ILT |
2210 | if (parameters->target().is_big_endian()) |
2211 | { | |
2212 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
2ea97941 | 2213 | sym = this->define_special_symbol<size, true>(&name, &version, |
8c500701 ILT |
2214 | false, &oldsym, |
2215 | &resolve_oldsym); | |
f3e9c5c5 ILT |
2216 | #else |
2217 | gold_unreachable(); | |
2218 | #endif | |
2219 | } | |
2220 | else | |
2221 | { | |
2222 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
2ea97941 | 2223 | sym = this->define_special_symbol<size, false>(&name, &version, |
8c500701 ILT |
2224 | false, &oldsym, |
2225 | &resolve_oldsym); | |
f3e9c5c5 ILT |
2226 | #else |
2227 | gold_unreachable(); | |
2228 | #endif | |
2229 | } | |
2230 | ||
2231 | gold_assert(oldsym == NULL); | |
2232 | ||
2ea97941 | 2233 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
f3e9c5c5 ILT |
2234 | elfcpp::STV_DEFAULT, 0); |
2235 | ++this->saw_undefined_; | |
2236 | } | |
2237 | } | |
2238 | ||
a3ad94ed ILT |
2239 | // Set the dynamic symbol indexes. INDEX is the index of the first |
2240 | // global dynamic symbol. Pointers to the symbols are stored into the | |
2241 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
2242 | // updated dynamic symbol index. | |
2243 | ||
2244 | unsigned int | |
9b07f471 | 2245 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 2246 | std::vector<Symbol*>* syms, |
14b31740 ILT |
2247 | Stringpool* dynpool, |
2248 | Versions* versions) | |
a3ad94ed ILT |
2249 | { |
2250 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
2251 | p != this->table_.end(); | |
2252 | ++p) | |
2253 | { | |
2254 | Symbol* sym = p->second; | |
16649710 ILT |
2255 | |
2256 | // Note that SYM may already have a dynamic symbol index, since | |
2257 | // some symbols appear more than once in the symbol table, with | |
2258 | // and without a version. | |
2259 | ||
ce97fa81 | 2260 | if (!sym->should_add_dynsym_entry(this)) |
16649710 ILT |
2261 | sym->set_dynsym_index(-1U); |
2262 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
2263 | { |
2264 | sym->set_dynsym_index(index); | |
2265 | ++index; | |
2266 | syms->push_back(sym); | |
cfd73a4e | 2267 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
2268 | |
2269 | // Record any version information. | |
09124467 ILT |
2270 | if (sym->version() != NULL) |
2271 | versions->record_version(this, dynpool, sym); | |
594c8e5e ILT |
2272 | |
2273 | // If the symbol is defined in a dynamic object and is | |
2274 | // referenced in a regular object, then mark the dynamic | |
2275 | // object as needed. This is used to implement --as-needed. | |
2276 | if (sym->is_from_dynobj() && sym->in_reg()) | |
2277 | sym->object()->set_is_needed(); | |
a3ad94ed ILT |
2278 | } |
2279 | } | |
2280 | ||
14b31740 ILT |
2281 | // Finish up the versions. In some cases this may add new dynamic |
2282 | // symbols. | |
9b07f471 | 2283 | index = versions->finalize(this, index, syms); |
14b31740 | 2284 | |
a3ad94ed ILT |
2285 | return index; |
2286 | } | |
2287 | ||
c06b7b0b | 2288 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
2289 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
2290 | // file offset OFF. Add their names to POOL. Return the new file | |
2291 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 2292 | |
75f65a3e | 2293 | off_t |
55a93433 ILT |
2294 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
2295 | size_t dyncount, Stringpool* pool, | |
2296 | unsigned int *plocal_symcount) | |
54dc6425 | 2297 | { |
f6ce93d6 ILT |
2298 | off_t ret; |
2299 | ||
55a93433 ILT |
2300 | gold_assert(*plocal_symcount != 0); |
2301 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 2302 | |
16649710 ILT |
2303 | this->dynamic_offset_ = dynoff; |
2304 | this->first_dynamic_global_index_ = dyn_global_index; | |
2305 | this->dynamic_count_ = dyncount; | |
2306 | ||
8851ecca | 2307 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
2308 | { |
2309 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 2310 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
2311 | #else |
2312 | gold_unreachable(); | |
2313 | #endif | |
2314 | } | |
8851ecca | 2315 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
2316 | { |
2317 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 2318 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
2319 | #else |
2320 | gold_unreachable(); | |
2321 | #endif | |
2322 | } | |
61ba1cf9 | 2323 | else |
a3ad94ed | 2324 | gold_unreachable(); |
f6ce93d6 ILT |
2325 | |
2326 | // Now that we have the final symbol table, we can reliably note | |
2327 | // which symbols should get warnings. | |
cb295612 | 2328 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2329 | |
2330 | return ret; | |
75f65a3e ILT |
2331 | } |
2332 | ||
55a93433 ILT |
2333 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2334 | // POOL, update *PINDEX and *POFF. | |
2335 | ||
2336 | template<int size> | |
2337 | void | |
2338 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2339 | unsigned int* pindex, off_t* poff) | |
2340 | { | |
2341 | sym->set_symtab_index(*pindex); | |
2342 | pool->add(sym->name(), false, NULL); | |
2343 | ++*pindex; | |
2344 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2345 | } | |
2346 | ||
ead1e424 ILT |
2347 | // Set the final value for all the symbols. This is called after |
2348 | // Layout::finalize, so all the output sections have their final | |
2349 | // address. | |
75f65a3e ILT |
2350 | |
2351 | template<int size> | |
2352 | off_t | |
55a93433 ILT |
2353 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2354 | unsigned int* plocal_symcount) | |
75f65a3e | 2355 | { |
ead1e424 | 2356 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2357 | this->offset_ = off; |
2358 | ||
55a93433 ILT |
2359 | unsigned int index = *plocal_symcount; |
2360 | const unsigned int orig_index = index; | |
c06b7b0b | 2361 | |
55a93433 ILT |
2362 | // First do all the symbols which have been forced to be local, as |
2363 | // they must appear before all global symbols. | |
2364 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2365 | p != this->forced_locals_.end(); | |
2366 | ++p) | |
2367 | { | |
2368 | Symbol* sym = *p; | |
2369 | gold_assert(sym->is_forced_local()); | |
2370 | if (this->sized_finalize_symbol<size>(sym)) | |
2371 | { | |
2372 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2373 | ++*plocal_symcount; | |
2374 | } | |
2375 | } | |
2376 | ||
2377 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2378 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2379 | p != this->table_.end(); | |
2380 | ++p) | |
54dc6425 | 2381 | { |
55a93433 ILT |
2382 | Symbol* sym = p->second; |
2383 | if (this->sized_finalize_symbol<size>(sym)) | |
2384 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2385 | } | |
54dc6425 | 2386 | |
55a93433 | 2387 | this->output_count_ = index - orig_index; |
a3ad94ed | 2388 | |
55a93433 ILT |
2389 | return off; |
2390 | } | |
75f65a3e | 2391 | |
c0a62865 DK |
2392 | // Compute the final value of SYM and store status in location PSTATUS. |
2393 | // During relaxation, this may be called multiple times for a symbol to | |
2394 | // compute its would-be final value in each relaxation pass. | |
008db82e | 2395 | |
55a93433 | 2396 | template<int size> |
c0a62865 DK |
2397 | typename Sized_symbol<size>::Value_type |
2398 | Symbol_table::compute_final_value( | |
2399 | const Sized_symbol<size>* sym, | |
2400 | Compute_final_value_status* pstatus) const | |
55a93433 | 2401 | { |
ef9beddf | 2402 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2ea97941 | 2403 | Value_type value; |
ead1e424 | 2404 | |
55a93433 ILT |
2405 | switch (sym->source()) |
2406 | { | |
2407 | case Symbol::FROM_OBJECT: | |
2408 | { | |
d491d34e | 2409 | bool is_ordinary; |
2ea97941 | 2410 | unsigned int shndx = sym->shndx(&is_ordinary); |
ead1e424 | 2411 | |
d491d34e | 2412 | if (!is_ordinary |
2ea97941 ILT |
2413 | && shndx != elfcpp::SHN_ABS |
2414 | && !Symbol::is_common_shndx(shndx)) | |
55a93433 | 2415 | { |
c0a62865 DK |
2416 | *pstatus = CFVS_UNSUPPORTED_SYMBOL_SECTION; |
2417 | return 0; | |
ead1e424 | 2418 | } |
ead1e424 | 2419 | |
55a93433 ILT |
2420 | Object* symobj = sym->object(); |
2421 | if (symobj->is_dynamic()) | |
ead1e424 | 2422 | { |
2ea97941 ILT |
2423 | value = 0; |
2424 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2425 | } |
89fc3421 CC |
2426 | else if (symobj->pluginobj() != NULL) |
2427 | { | |
2ea97941 ILT |
2428 | value = 0; |
2429 | shndx = elfcpp::SHN_UNDEF; | |
89fc3421 | 2430 | } |
2ea97941 ILT |
2431 | else if (shndx == elfcpp::SHN_UNDEF) |
2432 | value = 0; | |
d491d34e | 2433 | else if (!is_ordinary |
2ea97941 ILT |
2434 | && (shndx == elfcpp::SHN_ABS |
2435 | || Symbol::is_common_shndx(shndx))) | |
2436 | value = sym->value(); | |
55a93433 | 2437 | else |
ead1e424 | 2438 | { |
55a93433 | 2439 | Relobj* relobj = static_cast<Relobj*>(symobj); |
2ea97941 | 2440 | Output_section* os = relobj->output_section(shndx); |
55a93433 | 2441 | |
2ea97941 | 2442 | if (this->is_section_folded(relobj, shndx)) |
ef15dade ST |
2443 | { |
2444 | gold_assert(os == NULL); | |
2445 | // Get the os of the section it is folded onto. | |
2446 | Section_id folded = this->icf_->get_folded_section(relobj, | |
2ea97941 | 2447 | shndx); |
ef15dade ST |
2448 | gold_assert(folded.first != NULL); |
2449 | Relobj* folded_obj = reinterpret_cast<Relobj*>(folded.first); | |
d6344fb5 DK |
2450 | unsigned folded_shndx = folded.second; |
2451 | ||
2452 | os = folded_obj->output_section(folded_shndx); | |
ef15dade | 2453 | gold_assert(os != NULL); |
d6344fb5 DK |
2454 | |
2455 | // Replace (relobj, shndx) with canonical ICF input section. | |
2456 | shndx = folded_shndx; | |
2457 | relobj = folded_obj; | |
ef15dade ST |
2458 | } |
2459 | ||
d6344fb5 | 2460 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
ef15dade | 2461 | if (os == NULL) |
ead1e424 | 2462 | { |
6d03d481 ST |
2463 | bool static_or_reloc = (parameters->doing_static_link() || |
2464 | parameters->options().relocatable()); | |
2465 | gold_assert(static_or_reloc || sym->dynsym_index() == -1U); | |
2466 | ||
c0a62865 DK |
2467 | *pstatus = CFVS_NO_OUTPUT_SECTION; |
2468 | return 0; | |
ead1e424 | 2469 | } |
55a93433 | 2470 | |
eff45813 CC |
2471 | if (secoff64 == -1ULL) |
2472 | { | |
2473 | // The section needs special handling (e.g., a merge section). | |
ef15dade | 2474 | |
2ea97941 | 2475 | value = os->output_address(relobj, shndx, sym->value()); |
eff45813 CC |
2476 | } |
2477 | else | |
2478 | { | |
2479 | Value_type secoff = | |
2480 | convert_types<Value_type, uint64_t>(secoff64); | |
2481 | if (sym->type() == elfcpp::STT_TLS) | |
2ea97941 | 2482 | value = sym->value() + os->tls_offset() + secoff; |
eff45813 | 2483 | else |
2ea97941 | 2484 | value = sym->value() + os->address() + secoff; |
eff45813 | 2485 | } |
ead1e424 | 2486 | } |
55a93433 ILT |
2487 | } |
2488 | break; | |
2489 | ||
2490 | case Symbol::IN_OUTPUT_DATA: | |
2491 | { | |
2492 | Output_data* od = sym->output_data(); | |
2ea97941 | 2493 | value = sym->value(); |
155a0dd7 | 2494 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2495 | value += od->address(); |
155a0dd7 ILT |
2496 | else |
2497 | { | |
2498 | Output_section* os = od->output_section(); | |
2499 | gold_assert(os != NULL); | |
2ea97941 | 2500 | value += os->tls_offset() + (od->address() - os->address()); |
155a0dd7 | 2501 | } |
55a93433 | 2502 | if (sym->offset_is_from_end()) |
2ea97941 | 2503 | value += od->data_size(); |
55a93433 ILT |
2504 | } |
2505 | break; | |
2506 | ||
2507 | case Symbol::IN_OUTPUT_SEGMENT: | |
2508 | { | |
2509 | Output_segment* os = sym->output_segment(); | |
2ea97941 | 2510 | value = sym->value(); |
edfbb029 | 2511 | if (sym->type() != elfcpp::STT_TLS) |
2ea97941 | 2512 | value += os->vaddr(); |
55a93433 ILT |
2513 | switch (sym->offset_base()) |
2514 | { | |
2515 | case Symbol::SEGMENT_START: | |
2516 | break; | |
2517 | case Symbol::SEGMENT_END: | |
2ea97941 | 2518 | value += os->memsz(); |
55a93433 ILT |
2519 | break; |
2520 | case Symbol::SEGMENT_BSS: | |
2ea97941 | 2521 | value += os->filesz(); |
55a93433 ILT |
2522 | break; |
2523 | default: | |
2524 | gold_unreachable(); | |
2525 | } | |
2526 | } | |
2527 | break; | |
ead1e424 | 2528 | |
f3e9c5c5 | 2529 | case Symbol::IS_CONSTANT: |
2ea97941 | 2530 | value = sym->value(); |
55a93433 | 2531 | break; |
ead1e424 | 2532 | |
f3e9c5c5 | 2533 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2534 | value = 0; |
f3e9c5c5 ILT |
2535 | break; |
2536 | ||
55a93433 ILT |
2537 | default: |
2538 | gold_unreachable(); | |
2539 | } | |
ead1e424 | 2540 | |
c0a62865 | 2541 | *pstatus = CFVS_OK; |
2ea97941 | 2542 | return value; |
c0a62865 DK |
2543 | } |
2544 | ||
2545 | // Finalize the symbol SYM. This returns true if the symbol should be | |
2546 | // added to the symbol table, false otherwise. | |
2547 | ||
2548 | template<int size> | |
2549 | bool | |
2550 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2551 | { | |
2552 | typedef typename Sized_symbol<size>::Value_type Value_type; | |
2553 | ||
2554 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); | |
2555 | ||
2556 | // The default version of a symbol may appear twice in the symbol | |
2557 | // table. We only need to finalize it once. | |
2558 | if (sym->has_symtab_index()) | |
2559 | return false; | |
2560 | ||
2561 | if (!sym->in_reg()) | |
2562 | { | |
2563 | gold_assert(!sym->has_symtab_index()); | |
2564 | sym->set_symtab_index(-1U); | |
2565 | gold_assert(sym->dynsym_index() == -1U); | |
2566 | return false; | |
2567 | } | |
2568 | ||
2569 | // Compute final symbol value. | |
2570 | Compute_final_value_status status; | |
2ea97941 | 2571 | Value_type value = this->compute_final_value(sym, &status); |
c0a62865 DK |
2572 | |
2573 | switch (status) | |
2574 | { | |
2575 | case CFVS_OK: | |
2576 | break; | |
2577 | case CFVS_UNSUPPORTED_SYMBOL_SECTION: | |
2578 | { | |
2579 | bool is_ordinary; | |
2ea97941 | 2580 | unsigned int shndx = sym->shndx(&is_ordinary); |
c0a62865 | 2581 | gold_error(_("%s: unsupported symbol section 0x%x"), |
2ea97941 | 2582 | sym->demangled_name().c_str(), shndx); |
c0a62865 DK |
2583 | } |
2584 | break; | |
2585 | case CFVS_NO_OUTPUT_SECTION: | |
2586 | sym->set_symtab_index(-1U); | |
2587 | return false; | |
2588 | default: | |
2589 | gold_unreachable(); | |
2590 | } | |
2591 | ||
2ea97941 | 2592 | sym->set_value(value); |
9e2dcb77 | 2593 | |
8c604651 CS |
2594 | if (parameters->options().strip_all() |
2595 | || !parameters->options().should_retain_symbol(sym->name())) | |
55a93433 ILT |
2596 | { |
2597 | sym->set_symtab_index(-1U); | |
2598 | return false; | |
54dc6425 | 2599 | } |
75f65a3e | 2600 | |
55a93433 | 2601 | return true; |
54dc6425 ILT |
2602 | } |
2603 | ||
61ba1cf9 ILT |
2604 | // Write out the global symbols. |
2605 | ||
2606 | void | |
fd9d194f | 2607 | Symbol_table::write_globals(const Stringpool* sympool, |
d491d34e ILT |
2608 | const Stringpool* dynpool, |
2609 | Output_symtab_xindex* symtab_xindex, | |
2610 | Output_symtab_xindex* dynsym_xindex, | |
2611 | Output_file* of) const | |
61ba1cf9 | 2612 | { |
8851ecca | 2613 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2614 | { |
9025d29d | 2615 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2616 | case Parameters::TARGET_32_LITTLE: |
fd9d194f | 2617 | this->sized_write_globals<32, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2618 | dynsym_xindex, of); |
8851ecca | 2619 | break; |
9025d29d | 2620 | #endif |
8851ecca ILT |
2621 | #ifdef HAVE_TARGET_32_BIG |
2622 | case Parameters::TARGET_32_BIG: | |
fd9d194f | 2623 | this->sized_write_globals<32, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2624 | dynsym_xindex, of); |
8851ecca | 2625 | break; |
9025d29d | 2626 | #endif |
9025d29d | 2627 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2628 | case Parameters::TARGET_64_LITTLE: |
fd9d194f | 2629 | this->sized_write_globals<64, false>(sympool, dynpool, symtab_xindex, |
d491d34e | 2630 | dynsym_xindex, of); |
8851ecca | 2631 | break; |
9025d29d | 2632 | #endif |
8851ecca ILT |
2633 | #ifdef HAVE_TARGET_64_BIG |
2634 | case Parameters::TARGET_64_BIG: | |
fd9d194f | 2635 | this->sized_write_globals<64, true>(sympool, dynpool, symtab_xindex, |
d491d34e | 2636 | dynsym_xindex, of); |
8851ecca ILT |
2637 | break; |
2638 | #endif | |
2639 | default: | |
2640 | gold_unreachable(); | |
61ba1cf9 | 2641 | } |
61ba1cf9 ILT |
2642 | } |
2643 | ||
2644 | // Write out the global symbols. | |
2645 | ||
2646 | template<int size, bool big_endian> | |
2647 | void | |
fd9d194f | 2648 | Symbol_table::sized_write_globals(const Stringpool* sympool, |
16649710 | 2649 | const Stringpool* dynpool, |
d491d34e ILT |
2650 | Output_symtab_xindex* symtab_xindex, |
2651 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2652 | Output_file* of) const |
2653 | { | |
8851ecca | 2654 | const Target& target = parameters->target(); |
9a2d6984 | 2655 | |
61ba1cf9 | 2656 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2657 | |
2658 | const unsigned int output_count = this->output_count_; | |
2659 | const section_size_type oview_size = output_count * sym_size; | |
2660 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2661 | unsigned char* psyms; |
2662 | if (this->offset_ == 0 || output_count == 0) | |
2663 | psyms = NULL; | |
2664 | else | |
2665 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2666 | |
55a93433 ILT |
2667 | const unsigned int dynamic_count = this->dynamic_count_; |
2668 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2669 | const unsigned int first_dynamic_global_index = | |
2670 | this->first_dynamic_global_index_; | |
16649710 | 2671 | unsigned char* dynamic_view; |
5fe2a0f5 | 2672 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2673 | dynamic_view = NULL; |
2674 | else | |
2675 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2676 | |
61ba1cf9 ILT |
2677 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2678 | p != this->table_.end(); | |
2679 | ++p) | |
2680 | { | |
2681 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2682 | ||
9a2d6984 | 2683 | // Possibly warn about unresolved symbols in shared libraries. |
fd9d194f | 2684 | this->warn_about_undefined_dynobj_symbol(sym); |
e2827e5f | 2685 | |
a3ad94ed | 2686 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2687 | unsigned int dynsym_index; |
2688 | if (dynamic_view == NULL) | |
2689 | dynsym_index = -1U; | |
2690 | else | |
2691 | dynsym_index = sym->dynsym_index(); | |
2692 | ||
2693 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2694 | { |
2695 | // This symbol is not included in the output file. | |
2696 | continue; | |
2697 | } | |
16649710 | 2698 | |
2ea97941 | 2699 | unsigned int shndx; |
88dd47ac ILT |
2700 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2701 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ce279a62 | 2702 | elfcpp::STB binding = sym->binding(); |
ead1e424 ILT |
2703 | switch (sym->source()) |
2704 | { | |
2705 | case Symbol::FROM_OBJECT: | |
2706 | { | |
d491d34e ILT |
2707 | bool is_ordinary; |
2708 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2709 | |
d491d34e | 2710 | if (!is_ordinary |
0dfbdef4 | 2711 | && in_shndx != elfcpp::SHN_ABS |
8a5e3e08 | 2712 | && !Symbol::is_common_shndx(in_shndx)) |
ead1e424 | 2713 | { |
75f2446e | 2714 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2715 | sym->demangled_name().c_str(), in_shndx); |
2ea97941 | 2716 | shndx = in_shndx; |
f6ce93d6 | 2717 | } |
ead1e424 ILT |
2718 | else |
2719 | { | |
75f2446e ILT |
2720 | Object* symobj = sym->object(); |
2721 | if (symobj->is_dynamic()) | |
2722 | { | |
2723 | if (sym->needs_dynsym_value()) | |
8851ecca | 2724 | dynsym_value = target.dynsym_value(sym); |
2ea97941 | 2725 | shndx = elfcpp::SHN_UNDEF; |
ce279a62 CC |
2726 | if (sym->is_undef_binding_weak()) |
2727 | binding = elfcpp::STB_WEAK; | |
75f2446e | 2728 | } |
89fc3421 | 2729 | else if (symobj->pluginobj() != NULL) |
2ea97941 | 2730 | shndx = elfcpp::SHN_UNDEF; |
75f2446e | 2731 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
2732 | || (!is_ordinary |
2733 | && (in_shndx == elfcpp::SHN_ABS | |
8a5e3e08 | 2734 | || Symbol::is_common_shndx(in_shndx)))) |
2ea97941 | 2735 | shndx = in_shndx; |
75f2446e ILT |
2736 | else |
2737 | { | |
2738 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 2739 | Output_section* os = relobj->output_section(in_shndx); |
ef15dade ST |
2740 | if (this->is_section_folded(relobj, in_shndx)) |
2741 | { | |
2742 | // This global symbol must be written out even though | |
2743 | // it is folded. | |
2744 | // Get the os of the section it is folded onto. | |
2745 | Section_id folded = | |
2746 | this->icf_->get_folded_section(relobj, in_shndx); | |
2747 | gold_assert(folded.first !=NULL); | |
2748 | Relobj* folded_obj = | |
2749 | reinterpret_cast<Relobj*>(folded.first); | |
2750 | os = folded_obj->output_section(folded.second); | |
2751 | gold_assert(os != NULL); | |
2752 | } | |
75f2446e | 2753 | gold_assert(os != NULL); |
2ea97941 | 2754 | shndx = os->out_shndx(); |
88dd47ac | 2755 | |
2ea97941 | 2756 | if (shndx >= elfcpp::SHN_LORESERVE) |
d491d34e ILT |
2757 | { |
2758 | if (sym_index != -1U) | |
2ea97941 | 2759 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 2760 | if (dynsym_index != -1U) |
2ea97941 ILT |
2761 | dynsym_xindex->add(dynsym_index, shndx); |
2762 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e ILT |
2763 | } |
2764 | ||
88dd47ac ILT |
2765 | // In object files symbol values are section |
2766 | // relative. | |
8851ecca | 2767 | if (parameters->options().relocatable()) |
88dd47ac | 2768 | sym_value -= os->address(); |
75f2446e | 2769 | } |
ead1e424 ILT |
2770 | } |
2771 | } | |
2772 | break; | |
2773 | ||
2774 | case Symbol::IN_OUTPUT_DATA: | |
2ea97941 ILT |
2775 | shndx = sym->output_data()->out_shndx(); |
2776 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e ILT |
2777 | { |
2778 | if (sym_index != -1U) | |
2ea97941 | 2779 | symtab_xindex->add(sym_index, shndx); |
d491d34e | 2780 | if (dynsym_index != -1U) |
2ea97941 ILT |
2781 | dynsym_xindex->add(dynsym_index, shndx); |
2782 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 2783 | } |
ead1e424 ILT |
2784 | break; |
2785 | ||
2786 | case Symbol::IN_OUTPUT_SEGMENT: | |
2ea97941 | 2787 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
2788 | break; |
2789 | ||
f3e9c5c5 | 2790 | case Symbol::IS_CONSTANT: |
2ea97941 | 2791 | shndx = elfcpp::SHN_ABS; |
ead1e424 ILT |
2792 | break; |
2793 | ||
f3e9c5c5 | 2794 | case Symbol::IS_UNDEFINED: |
2ea97941 | 2795 | shndx = elfcpp::SHN_UNDEF; |
f3e9c5c5 ILT |
2796 | break; |
2797 | ||
ead1e424 | 2798 | default: |
a3ad94ed | 2799 | gold_unreachable(); |
ead1e424 | 2800 | } |
61ba1cf9 | 2801 | |
16649710 ILT |
2802 | if (sym_index != -1U) |
2803 | { | |
55a93433 ILT |
2804 | sym_index -= first_global_index; |
2805 | gold_assert(sym_index < output_count); | |
2806 | unsigned char* ps = psyms + (sym_index * sym_size); | |
2ea97941 | 2807 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
ce279a62 | 2808 | binding, sympool, ps); |
16649710 | 2809 | } |
61ba1cf9 | 2810 | |
16649710 ILT |
2811 | if (dynsym_index != -1U) |
2812 | { | |
2813 | dynsym_index -= first_dynamic_global_index; | |
2814 | gold_assert(dynsym_index < dynamic_count); | |
2815 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
2ea97941 | 2816 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
ce279a62 | 2817 | binding, dynpool, pd); |
16649710 | 2818 | } |
61ba1cf9 ILT |
2819 | } |
2820 | ||
c06b7b0b | 2821 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
2822 | if (dynamic_view != NULL) |
2823 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
2824 | } | |
2825 | ||
2826 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
2827 | // strtab holding the name. | |
2828 | ||
2829 | template<int size, bool big_endian> | |
2830 | void | |
ab5c9e90 ILT |
2831 | Symbol_table::sized_write_symbol( |
2832 | Sized_symbol<size>* sym, | |
2ea97941 ILT |
2833 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
2834 | unsigned int shndx, | |
ce279a62 | 2835 | elfcpp::STB binding, |
ab5c9e90 | 2836 | const Stringpool* pool, |
7d1a9ebb | 2837 | unsigned char* p) const |
16649710 ILT |
2838 | { |
2839 | elfcpp::Sym_write<size, big_endian> osym(p); | |
2840 | osym.put_st_name(pool->get_offset(sym->name())); | |
2ea97941 | 2841 | osym.put_st_value(value); |
58e54ac2 | 2842 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2ea97941 | 2843 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) |
58e54ac2 CD |
2844 | osym.put_st_size(0); |
2845 | else | |
2846 | osym.put_st_size(sym->symsize()); | |
53d7974c L |
2847 | elfcpp::STT type = sym->type(); |
2848 | // Turn IFUNC symbols from shared libraries into normal FUNC symbols. | |
2849 | if (type == elfcpp::STT_GNU_IFUNC | |
2850 | && sym->is_from_dynobj()) | |
2851 | type = elfcpp::STT_FUNC; | |
55a93433 ILT |
2852 | // A version script may have overridden the default binding. |
2853 | if (sym->is_forced_local()) | |
53d7974c | 2854 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, type)); |
55a93433 | 2855 | else |
ce279a62 | 2856 | osym.put_st_info(elfcpp::elf_st_info(binding, type)); |
16649710 | 2857 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2ea97941 | 2858 | osym.put_st_shndx(shndx); |
61ba1cf9 ILT |
2859 | } |
2860 | ||
9a2d6984 ILT |
2861 | // Check for unresolved symbols in shared libraries. This is |
2862 | // controlled by the --allow-shlib-undefined option. | |
2863 | ||
2864 | // We only warn about libraries for which we have seen all the | |
2865 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2866 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2867 | // entry, we aren't going to be able to reliably report whether the | |
2868 | // symbol is undefined. | |
2869 | ||
fd9d194f ILT |
2870 | // We also don't warn about libraries found in a system library |
2871 | // directory (e.g., /lib or /usr/lib); we assume that those libraries | |
2872 | // are OK. This heuristic avoids problems on GNU/Linux, in which -ldl | |
2873 | // can have undefined references satisfied by ld-linux.so. | |
9a2d6984 ILT |
2874 | |
2875 | inline void | |
fd9d194f | 2876 | Symbol_table::warn_about_undefined_dynobj_symbol(Symbol* sym) const |
9a2d6984 | 2877 | { |
d491d34e | 2878 | bool dummy; |
9a2d6984 ILT |
2879 | if (sym->source() == Symbol::FROM_OBJECT |
2880 | && sym->object()->is_dynamic() | |
d491d34e | 2881 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 2882 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
2883 | && !parameters->options().allow_shlib_undefined() |
2884 | && !parameters->target().is_defined_by_abi(sym) | |
fd9d194f | 2885 | && !sym->object()->is_in_system_directory()) |
9a2d6984 ILT |
2886 | { |
2887 | // A very ugly cast. | |
2888 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2889 | if (!dynobj->has_unknown_needed_entries()) | |
f073bbf7 | 2890 | gold_undefined_symbol(sym); |
9a2d6984 ILT |
2891 | } |
2892 | } | |
2893 | ||
a3ad94ed ILT |
2894 | // Write out a section symbol. Return the update offset. |
2895 | ||
2896 | void | |
9025d29d | 2897 | Symbol_table::write_section_symbol(const Output_section *os, |
d491d34e | 2898 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2899 | Output_file* of, |
2900 | off_t offset) const | |
2901 | { | |
8851ecca | 2902 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2903 | { |
9025d29d | 2904 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2905 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
2906 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
2907 | offset); | |
8851ecca | 2908 | break; |
9025d29d | 2909 | #endif |
8851ecca ILT |
2910 | #ifdef HAVE_TARGET_32_BIG |
2911 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
2912 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
2913 | offset); | |
8851ecca | 2914 | break; |
9025d29d | 2915 | #endif |
9025d29d | 2916 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2917 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
2918 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
2919 | offset); | |
8851ecca | 2920 | break; |
9025d29d | 2921 | #endif |
8851ecca ILT |
2922 | #ifdef HAVE_TARGET_64_BIG |
2923 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
2924 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
2925 | offset); | |
8851ecca ILT |
2926 | break; |
2927 | #endif | |
2928 | default: | |
2929 | gold_unreachable(); | |
a3ad94ed | 2930 | } |
a3ad94ed ILT |
2931 | } |
2932 | ||
2933 | // Write out a section symbol, specialized for size and endianness. | |
2934 | ||
2935 | template<int size, bool big_endian> | |
2936 | void | |
2937 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 2938 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2939 | Output_file* of, |
2940 | off_t offset) const | |
2941 | { | |
2942 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2943 | ||
2944 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2945 | ||
2946 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2947 | osym.put_st_name(0); | |
b4ecf66b ILT |
2948 | if (parameters->options().relocatable()) |
2949 | osym.put_st_value(0); | |
2950 | else | |
2951 | osym.put_st_value(os->address()); | |
a3ad94ed ILT |
2952 | osym.put_st_size(0); |
2953 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2954 | elfcpp::STT_SECTION)); | |
2955 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e | 2956 | |
2ea97941 ILT |
2957 | unsigned int shndx = os->out_shndx(); |
2958 | if (shndx >= elfcpp::SHN_LORESERVE) | |
d491d34e | 2959 | { |
2ea97941 ILT |
2960 | symtab_xindex->add(os->symtab_index(), shndx); |
2961 | shndx = elfcpp::SHN_XINDEX; | |
d491d34e | 2962 | } |
2ea97941 | 2963 | osym.put_st_shndx(shndx); |
a3ad94ed ILT |
2964 | |
2965 | of->write_output_view(offset, sym_size, pov); | |
2966 | } | |
2967 | ||
abaa3995 ILT |
2968 | // Print statistical information to stderr. This is used for --stats. |
2969 | ||
2970 | void | |
2971 | Symbol_table::print_stats() const | |
2972 | { | |
2973 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2974 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2975 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2976 | #else | |
2977 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2978 | program_name, this->table_.size()); | |
2979 | #endif | |
ad8f37d1 | 2980 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2981 | } |
2982 | ||
ff541f30 ILT |
2983 | // We check for ODR violations by looking for symbols with the same |
2984 | // name for which the debugging information reports that they were | |
2985 | // defined in different source locations. When comparing the source | |
2986 | // location, we consider instances with the same base filename and | |
2987 | // line number to be the same. This is because different object | |
2988 | // files/shared libraries can include the same header file using | |
2989 | // different paths, and we don't want to report an ODR violation in | |
2990 | // that case. | |
2991 | ||
2992 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2993 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2994 | // operator used with std::set. |
2995 | ||
2996 | struct Odr_violation_compare | |
2997 | { | |
2998 | bool | |
2999 | operator()(const std::string& s1, const std::string& s2) const | |
3000 | { | |
3001 | std::string::size_type pos1 = s1.rfind('/'); | |
3002 | std::string::size_type pos2 = s2.rfind('/'); | |
3003 | if (pos1 == std::string::npos | |
3004 | || pos2 == std::string::npos) | |
3005 | return s1 < s2; | |
3006 | return s1.compare(pos1, std::string::npos, | |
3007 | s2, pos2, std::string::npos) < 0; | |
3008 | } | |
3009 | }; | |
3010 | ||
70e654ba ILT |
3011 | // Check candidate_odr_violations_ to find symbols with the same name |
3012 | // but apparently different definitions (different source-file/line-no). | |
3013 | ||
3014 | void | |
17a1d0a9 ILT |
3015 | Symbol_table::detect_odr_violations(const Task* task, |
3016 | const char* output_file_name) const | |
70e654ba ILT |
3017 | { |
3018 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
3019 | it != candidate_odr_violations_.end(); | |
3020 | ++it) | |
3021 | { | |
3022 | const char* symbol_name = it->first; | |
e5ca47ba ILT |
3023 | // Maps from symbol location to a sample object file we found |
3024 | // that location in. We use a sorted map so the location order | |
3025 | // is deterministic, but we only store an arbitrary object file | |
3026 | // to avoid copying lots of names. | |
3027 | std::map<std::string, std::string, Odr_violation_compare> line_nums; | |
70e654ba | 3028 | |
b01c0a4a ILT |
3029 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
3030 | locs = it->second.begin(); | |
3031 | locs != it->second.end(); | |
3032 | ++locs) | |
70e654ba ILT |
3033 | { |
3034 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
3035 | // means that we have to run in a singleton Task. If we |
3036 | // want to run this in a general Task for better | |
3037 | // performance, we will need one Task for object, plus | |
3038 | // appropriate locking to ensure that we don't conflict with | |
e4e5049b CS |
3039 | // other uses of the object. Also note, one_addr2line is not |
3040 | // currently thread-safe. | |
17a1d0a9 | 3041 | Task_lock_obj<Object> tl(task, locs->object); |
e4e5049b | 3042 | // 16 is the size of the object-cache that one_addr2line should use. |
a55ce7fe | 3043 | std::string lineno = Dwarf_line_info::one_addr2line( |
e4e5049b | 3044 | locs->object, locs->shndx, locs->offset, 16); |
70e654ba | 3045 | if (!lineno.empty()) |
e5ca47ba ILT |
3046 | { |
3047 | std::string& sample_object = line_nums[lineno]; | |
3048 | if (sample_object.empty()) | |
3049 | sample_object = locs->object->name(); | |
3050 | } | |
70e654ba ILT |
3051 | } |
3052 | ||
3053 | if (line_nums.size() > 1) | |
3054 | { | |
dd8670e5 | 3055 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 3056 | "places (possible ODR violation):"), |
a2b1aa12 | 3057 | output_file_name, demangle(symbol_name).c_str()); |
e5ca47ba ILT |
3058 | for (std::map<std::string, std::string>::const_iterator it2 = |
3059 | line_nums.begin(); | |
3060 | it2 != line_nums.end(); | |
3061 | ++it2) | |
3062 | fprintf(stderr, _(" %s from %s\n"), | |
3063 | it2->first.c_str(), it2->second.c_str()); | |
70e654ba ILT |
3064 | } |
3065 | } | |
e4e5049b CS |
3066 | // We only call one_addr2line() in this function, so we can clear its cache. |
3067 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
3068 | } |
3069 | ||
f6ce93d6 ILT |
3070 | // Warnings functions. |
3071 | ||
3072 | // Add a new warning. | |
3073 | ||
3074 | void | |
2ea97941 | 3075 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, |
cb295612 | 3076 | const std::string& warning) |
f6ce93d6 | 3077 | { |
2ea97941 ILT |
3078 | name = symtab->canonicalize_name(name); |
3079 | this->warnings_[name].set(obj, warning); | |
f6ce93d6 ILT |
3080 | } |
3081 | ||
3082 | // Look through the warnings and mark the symbols for which we should | |
3083 | // warn. This is called during Layout::finalize when we know the | |
3084 | // sources for all the symbols. | |
3085 | ||
3086 | void | |
cb295612 | 3087 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
3088 | { |
3089 | for (Warning_table::iterator p = this->warnings_.begin(); | |
3090 | p != this->warnings_.end(); | |
3091 | ++p) | |
3092 | { | |
3093 | Symbol* sym = symtab->lookup(p->first, NULL); | |
3094 | if (sym != NULL | |
3095 | && sym->source() == Symbol::FROM_OBJECT | |
3096 | && sym->object() == p->second.object) | |
cb295612 | 3097 | sym->set_has_warning(); |
f6ce93d6 ILT |
3098 | } |
3099 | } | |
3100 | ||
3101 | // Issue a warning. This is called when we see a relocation against a | |
3102 | // symbol for which has a warning. | |
3103 | ||
75f2446e | 3104 | template<int size, bool big_endian> |
f6ce93d6 | 3105 | void |
75f2446e ILT |
3106 | Warnings::issue_warning(const Symbol* sym, |
3107 | const Relocate_info<size, big_endian>* relinfo, | |
3108 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 3109 | { |
a3ad94ed | 3110 | gold_assert(sym->has_warning()); |
f6ce93d6 | 3111 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 3112 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
3113 | gold_warning_at_location(relinfo, relnum, reloffset, |
3114 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
3115 | } |
3116 | ||
14bfc3f5 ILT |
3117 | // Instantiate the templates we need. We could use the configure |
3118 | // script to restrict this to only the ones needed for implemented | |
3119 | // targets. | |
3120 | ||
c7912668 ILT |
3121 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3122 | template | |
3123 | void | |
3124 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
3125 | #endif | |
3126 | ||
3127 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3128 | template | |
3129 | void | |
3130 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
3131 | #endif | |
3132 | ||
193a53d9 | 3133 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
3134 | template |
3135 | void | |
193a53d9 ILT |
3136 | Symbol_table::add_from_relobj<32, false>( |
3137 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 3138 | const unsigned char* syms, |
14bfc3f5 | 3139 | size_t count, |
d491d34e | 3140 | size_t symndx_offset, |
14bfc3f5 ILT |
3141 | const char* sym_names, |
3142 | size_t sym_name_size, | |
ae6dce4d | 3143 | Sized_relobj<32, false>::Symbols* sympointers, |
92de84a6 | 3144 | size_t* defined); |
193a53d9 | 3145 | #endif |
14bfc3f5 | 3146 | |
193a53d9 | 3147 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
3148 | template |
3149 | void | |
193a53d9 ILT |
3150 | Symbol_table::add_from_relobj<32, true>( |
3151 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 3152 | const unsigned char* syms, |
14bfc3f5 | 3153 | size_t count, |
d491d34e | 3154 | size_t symndx_offset, |
14bfc3f5 ILT |
3155 | const char* sym_names, |
3156 | size_t sym_name_size, | |
ae6dce4d | 3157 | Sized_relobj<32, true>::Symbols* sympointers, |
92de84a6 | 3158 | size_t* defined); |
193a53d9 | 3159 | #endif |
14bfc3f5 | 3160 | |
193a53d9 | 3161 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
3162 | template |
3163 | void | |
193a53d9 ILT |
3164 | Symbol_table::add_from_relobj<64, false>( |
3165 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 3166 | const unsigned char* syms, |
14bfc3f5 | 3167 | size_t count, |
d491d34e | 3168 | size_t symndx_offset, |
14bfc3f5 ILT |
3169 | const char* sym_names, |
3170 | size_t sym_name_size, | |
ae6dce4d | 3171 | Sized_relobj<64, false>::Symbols* sympointers, |
92de84a6 | 3172 | size_t* defined); |
193a53d9 | 3173 | #endif |
14bfc3f5 | 3174 | |
193a53d9 | 3175 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
3176 | template |
3177 | void | |
193a53d9 ILT |
3178 | Symbol_table::add_from_relobj<64, true>( |
3179 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 3180 | const unsigned char* syms, |
14bfc3f5 | 3181 | size_t count, |
d491d34e | 3182 | size_t symndx_offset, |
14bfc3f5 ILT |
3183 | const char* sym_names, |
3184 | size_t sym_name_size, | |
ae6dce4d | 3185 | Sized_relobj<64, true>::Symbols* sympointers, |
92de84a6 | 3186 | size_t* defined); |
193a53d9 | 3187 | #endif |
14bfc3f5 | 3188 | |
89fc3421 CC |
3189 | #ifdef HAVE_TARGET_32_LITTLE |
3190 | template | |
3191 | Symbol* | |
3192 | Symbol_table::add_from_pluginobj<32, false>( | |
3193 | Sized_pluginobj<32, false>* obj, | |
3194 | const char* name, | |
3195 | const char* ver, | |
3196 | elfcpp::Sym<32, false>* sym); | |
3197 | #endif | |
3198 | ||
3199 | #ifdef HAVE_TARGET_32_BIG | |
3200 | template | |
3201 | Symbol* | |
3202 | Symbol_table::add_from_pluginobj<32, true>( | |
3203 | Sized_pluginobj<32, true>* obj, | |
3204 | const char* name, | |
3205 | const char* ver, | |
3206 | elfcpp::Sym<32, true>* sym); | |
3207 | #endif | |
3208 | ||
3209 | #ifdef HAVE_TARGET_64_LITTLE | |
3210 | template | |
3211 | Symbol* | |
3212 | Symbol_table::add_from_pluginobj<64, false>( | |
3213 | Sized_pluginobj<64, false>* obj, | |
3214 | const char* name, | |
3215 | const char* ver, | |
3216 | elfcpp::Sym<64, false>* sym); | |
3217 | #endif | |
3218 | ||
3219 | #ifdef HAVE_TARGET_64_BIG | |
3220 | template | |
3221 | Symbol* | |
3222 | Symbol_table::add_from_pluginobj<64, true>( | |
3223 | Sized_pluginobj<64, true>* obj, | |
3224 | const char* name, | |
3225 | const char* ver, | |
3226 | elfcpp::Sym<64, true>* sym); | |
3227 | #endif | |
3228 | ||
193a53d9 | 3229 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
3230 | template |
3231 | void | |
193a53d9 ILT |
3232 | Symbol_table::add_from_dynobj<32, false>( |
3233 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
3234 | const unsigned char* syms, |
3235 | size_t count, | |
3236 | const char* sym_names, | |
3237 | size_t sym_name_size, | |
3238 | const unsigned char* versym, | |
3239 | size_t versym_size, | |
92de84a6 ILT |
3240 | const std::vector<const char*>* version_map, |
3241 | Sized_relobj<32, false>::Symbols* sympointers, | |
3242 | size_t* defined); | |
193a53d9 | 3243 | #endif |
dbe717ef | 3244 | |
193a53d9 | 3245 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
3246 | template |
3247 | void | |
193a53d9 ILT |
3248 | Symbol_table::add_from_dynobj<32, true>( |
3249 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
3250 | const unsigned char* syms, |
3251 | size_t count, | |
3252 | const char* sym_names, | |
3253 | size_t sym_name_size, | |
3254 | const unsigned char* versym, | |
3255 | size_t versym_size, | |
92de84a6 ILT |
3256 | const std::vector<const char*>* version_map, |
3257 | Sized_relobj<32, true>::Symbols* sympointers, | |
3258 | size_t* defined); | |
193a53d9 | 3259 | #endif |
dbe717ef | 3260 | |
193a53d9 | 3261 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
3262 | template |
3263 | void | |
193a53d9 ILT |
3264 | Symbol_table::add_from_dynobj<64, false>( |
3265 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
3266 | const unsigned char* syms, |
3267 | size_t count, | |
3268 | const char* sym_names, | |
3269 | size_t sym_name_size, | |
3270 | const unsigned char* versym, | |
3271 | size_t versym_size, | |
92de84a6 ILT |
3272 | const std::vector<const char*>* version_map, |
3273 | Sized_relobj<64, false>::Symbols* sympointers, | |
3274 | size_t* defined); | |
193a53d9 | 3275 | #endif |
dbe717ef | 3276 | |
193a53d9 | 3277 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
3278 | template |
3279 | void | |
193a53d9 ILT |
3280 | Symbol_table::add_from_dynobj<64, true>( |
3281 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
3282 | const unsigned char* syms, |
3283 | size_t count, | |
3284 | const char* sym_names, | |
3285 | size_t sym_name_size, | |
3286 | const unsigned char* versym, | |
3287 | size_t versym_size, | |
92de84a6 ILT |
3288 | const std::vector<const char*>* version_map, |
3289 | Sized_relobj<64, true>::Symbols* sympointers, | |
3290 | size_t* defined); | |
193a53d9 | 3291 | #endif |
dbe717ef | 3292 | |
46fe1623 ILT |
3293 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
3294 | template | |
3295 | void | |
fe8718a4 | 3296 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
3297 | Sized_symbol<32>* sym, |
3298 | Output_data* posd, | |
2ea97941 | 3299 | elfcpp::Elf_types<32>::Elf_Addr value); |
46fe1623 ILT |
3300 | #endif |
3301 | ||
3302 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
3303 | template | |
3304 | void | |
fe8718a4 | 3305 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
3306 | Sized_symbol<64>* sym, |
3307 | Output_data* posd, | |
2ea97941 | 3308 | elfcpp::Elf_types<64>::Elf_Addr value); |
46fe1623 ILT |
3309 | #endif |
3310 | ||
75f2446e ILT |
3311 | #ifdef HAVE_TARGET_32_LITTLE |
3312 | template | |
3313 | void | |
3314 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
3315 | const Relocate_info<32, false>* relinfo, | |
3316 | size_t relnum, off_t reloffset) const; | |
3317 | #endif | |
3318 | ||
3319 | #ifdef HAVE_TARGET_32_BIG | |
3320 | template | |
3321 | void | |
3322 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
3323 | const Relocate_info<32, true>* relinfo, | |
3324 | size_t relnum, off_t reloffset) const; | |
3325 | #endif | |
3326 | ||
3327 | #ifdef HAVE_TARGET_64_LITTLE | |
3328 | template | |
3329 | void | |
3330 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
3331 | const Relocate_info<64, false>* relinfo, | |
3332 | size_t relnum, off_t reloffset) const; | |
3333 | #endif | |
3334 | ||
3335 | #ifdef HAVE_TARGET_64_BIG | |
3336 | template | |
3337 | void | |
3338 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
3339 | const Relocate_info<64, true>* relinfo, | |
3340 | size_t relnum, off_t reloffset) const; | |
3341 | #endif | |
3342 | ||
14bfc3f5 | 3343 | } // End namespace gold. |