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14bfc3f5 ILT |
1 | // symtab.cc -- the gold symbol table |
2 | ||
e5756efb | 3 | // Copyright 2006, 2007, 2008 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 ILT |
32 | |
33 | #include "object.h" | |
70e654ba | 34 | #include "dwarf_reader.h" |
dbe717ef | 35 | #include "dynobj.h" |
75f65a3e | 36 | #include "output.h" |
61ba1cf9 | 37 | #include "target.h" |
645f8123 | 38 | #include "workqueue.h" |
14bfc3f5 | 39 | #include "symtab.h" |
89fc3421 | 40 | #include "plugin.h" |
14bfc3f5 ILT |
41 | |
42 | namespace gold | |
43 | { | |
44 | ||
45 | // Class Symbol. | |
46 | ||
ead1e424 ILT |
47 | // Initialize fields in Symbol. This initializes everything except u_ |
48 | // and source_. | |
14bfc3f5 | 49 | |
14bfc3f5 | 50 | void |
ead1e424 ILT |
51 | Symbol::init_fields(const char* name, const char* version, |
52 | elfcpp::STT type, elfcpp::STB binding, | |
53 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
54 | { |
55 | this->name_ = name; | |
56 | this->version_ = version; | |
c06b7b0b ILT |
57 | this->symtab_index_ = 0; |
58 | this->dynsym_index_ = 0; | |
0a65a3a7 | 59 | this->got_offsets_.init(); |
f4151f89 | 60 | this->plt_offset_ = 0; |
ead1e424 ILT |
61 | this->type_ = type; |
62 | this->binding_ = binding; | |
63 | this->visibility_ = visibility; | |
64 | this->nonvis_ = nonvis; | |
65 | this->is_target_special_ = false; | |
1564db8d ILT |
66 | this->is_def_ = false; |
67 | this->is_forwarder_ = false; | |
aeddab66 | 68 | this->has_alias_ = false; |
c06b7b0b | 69 | this->needs_dynsym_entry_ = false; |
008db82e | 70 | this->in_reg_ = false; |
ead1e424 | 71 | this->in_dyn_ = false; |
f4151f89 | 72 | this->has_plt_offset_ = 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; |
ead1e424 ILT |
78 | } |
79 | ||
a2b1aa12 ILT |
80 | // Return the demangled version of the symbol's name, but only |
81 | // if the --demangle flag was set. | |
82 | ||
83 | static std::string | |
84 | demangle(const char* name) | |
85 | { | |
086a1841 | 86 | if (!parameters->options().do_demangle()) |
ff541f30 ILT |
87 | return name; |
88 | ||
a2b1aa12 ILT |
89 | // cplus_demangle allocates memory for the result it returns, |
90 | // and returns NULL if the name is already demangled. | |
91 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); | |
92 | if (demangled_name == NULL) | |
93 | return name; | |
94 | ||
95 | std::string retval(demangled_name); | |
96 | free(demangled_name); | |
97 | return retval; | |
98 | } | |
99 | ||
100 | std::string | |
101 | Symbol::demangled_name() const | |
102 | { | |
ff541f30 | 103 | return demangle(this->name()); |
a2b1aa12 ILT |
104 | } |
105 | ||
ead1e424 ILT |
106 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
107 | ||
108 | template<int size, bool big_endian> | |
109 | void | |
f3e9c5c5 ILT |
110 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
111 | const elfcpp::Sym<size, big_endian>& sym, | |
112 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 ILT |
113 | { |
114 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
115 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
116 | this->u_.from_object.object = object; | |
d491d34e ILT |
117 | this->u_.from_object.shndx = st_shndx; |
118 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 119 | this->source_ = FROM_OBJECT; |
008db82e | 120 | this->in_reg_ = !object->is_dynamic(); |
1564db8d | 121 | this->in_dyn_ = object->is_dynamic(); |
89fc3421 | 122 | this->in_real_elf_ = object->pluginobj() == NULL; |
14bfc3f5 ILT |
123 | } |
124 | ||
ead1e424 ILT |
125 | // Initialize the fields in the base class Symbol for a symbol defined |
126 | // in an Output_data. | |
127 | ||
128 | void | |
75517b77 ILT |
129 | Symbol::init_base_output_data(const char* name, const char* version, |
130 | Output_data* od, elfcpp::STT type, | |
131 | elfcpp::STB binding, elfcpp::STV visibility, | |
132 | unsigned char nonvis, bool offset_is_from_end) | |
ead1e424 | 133 | { |
75517b77 | 134 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
135 | this->u_.in_output_data.output_data = od; |
136 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
137 | this->source_ = IN_OUTPUT_DATA; | |
008db82e | 138 | this->in_reg_ = true; |
89fc3421 | 139 | this->in_real_elf_ = true; |
ead1e424 ILT |
140 | } |
141 | ||
142 | // Initialize the fields in the base class Symbol for a symbol defined | |
143 | // in an Output_segment. | |
144 | ||
145 | void | |
75517b77 ILT |
146 | Symbol::init_base_output_segment(const char* name, const char* version, |
147 | Output_segment* os, elfcpp::STT type, | |
148 | elfcpp::STB binding, elfcpp::STV visibility, | |
149 | unsigned char nonvis, | |
f3e9c5c5 | 150 | Segment_offset_base offset_base) |
ead1e424 | 151 | { |
75517b77 | 152 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
153 | this->u_.in_output_segment.output_segment = os; |
154 | this->u_.in_output_segment.offset_base = offset_base; | |
155 | this->source_ = IN_OUTPUT_SEGMENT; | |
008db82e | 156 | this->in_reg_ = true; |
89fc3421 | 157 | this->in_real_elf_ = true; |
ead1e424 ILT |
158 | } |
159 | ||
160 | // Initialize the fields in the base class Symbol for a symbol defined | |
161 | // as a constant. | |
162 | ||
163 | void | |
75517b77 ILT |
164 | Symbol::init_base_constant(const char* name, const char* version, |
165 | elfcpp::STT type, elfcpp::STB binding, | |
166 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 167 | { |
75517b77 | 168 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
169 | this->source_ = IS_CONSTANT; |
170 | this->in_reg_ = true; | |
89fc3421 | 171 | this->in_real_elf_ = true; |
f3e9c5c5 ILT |
172 | } |
173 | ||
174 | // Initialize the fields in the base class Symbol for an undefined | |
175 | // symbol. | |
176 | ||
177 | void | |
75517b77 ILT |
178 | Symbol::init_base_undefined(const char* name, const char* version, |
179 | elfcpp::STT type, elfcpp::STB binding, | |
180 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 181 | { |
75517b77 | 182 | this->init_fields(name, version, type, binding, visibility, nonvis); |
d7ab2a47 | 183 | this->dynsym_index_ = -1U; |
f3e9c5c5 | 184 | this->source_ = IS_UNDEFINED; |
008db82e | 185 | this->in_reg_ = true; |
89fc3421 | 186 | this->in_real_elf_ = true; |
ead1e424 ILT |
187 | } |
188 | ||
c7912668 ILT |
189 | // Allocate a common symbol in the base. |
190 | ||
191 | void | |
192 | Symbol::allocate_base_common(Output_data* od) | |
193 | { | |
194 | gold_assert(this->is_common()); | |
195 | this->source_ = IN_OUTPUT_DATA; | |
196 | this->u_.in_output_data.output_data = od; | |
197 | this->u_.in_output_data.offset_is_from_end = false; | |
198 | } | |
199 | ||
ead1e424 | 200 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
201 | |
202 | template<int size> | |
203 | template<bool big_endian> | |
204 | void | |
f3e9c5c5 ILT |
205 | Sized_symbol<size>::init_object(const char* name, const char* version, |
206 | Object* object, | |
207 | const elfcpp::Sym<size, big_endian>& sym, | |
208 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 209 | { |
f3e9c5c5 | 210 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 211 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
212 | this->symsize_ = sym.get_st_size(); |
213 | } | |
214 | ||
215 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
216 | // Output_data. | |
217 | ||
218 | template<int size> | |
219 | void | |
75517b77 ILT |
220 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
221 | Output_data* od, Value_type value, | |
222 | Size_type symsize, elfcpp::STT type, | |
223 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
224 | elfcpp::STV visibility, |
225 | unsigned char nonvis, | |
226 | bool offset_is_from_end) | |
ead1e424 | 227 | { |
75517b77 ILT |
228 | this->init_base_output_data(name, version, od, type, binding, visibility, |
229 | nonvis, offset_is_from_end); | |
ead1e424 ILT |
230 | this->value_ = value; |
231 | this->symsize_ = symsize; | |
232 | } | |
233 | ||
234 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
235 | // Output_segment. | |
236 | ||
237 | template<int size> | |
238 | void | |
75517b77 ILT |
239 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
240 | Output_segment* os, Value_type value, | |
241 | Size_type symsize, elfcpp::STT type, | |
242 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
243 | elfcpp::STV visibility, |
244 | unsigned char nonvis, | |
245 | Segment_offset_base offset_base) | |
ead1e424 | 246 | { |
75517b77 ILT |
247 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
248 | nonvis, offset_base); | |
ead1e424 ILT |
249 | this->value_ = value; |
250 | this->symsize_ = symsize; | |
251 | } | |
252 | ||
253 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
254 | // constant. | |
255 | ||
256 | template<int size> | |
257 | void | |
75517b77 ILT |
258 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
259 | Value_type value, Size_type symsize, | |
260 | elfcpp::STT type, elfcpp::STB binding, | |
261 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 262 | { |
75517b77 | 263 | this->init_base_constant(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
264 | this->value_ = value; |
265 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
266 | } |
267 | ||
f3e9c5c5 ILT |
268 | // Initialize the fields in Sized_symbol for an undefined symbol. |
269 | ||
270 | template<int size> | |
271 | void | |
75517b77 ILT |
272 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
273 | elfcpp::STT type, elfcpp::STB binding, | |
274 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 275 | { |
75517b77 | 276 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
277 | this->value_ = 0; |
278 | this->symsize_ = 0; | |
279 | } | |
280 | ||
c7912668 ILT |
281 | // Allocate a common symbol. |
282 | ||
283 | template<int size> | |
284 | void | |
285 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) | |
286 | { | |
287 | this->allocate_base_common(od); | |
288 | this->value_ = value; | |
289 | } | |
290 | ||
436ca963 ILT |
291 | // Return true if this symbol should be added to the dynamic symbol |
292 | // table. | |
293 | ||
294 | inline bool | |
295 | Symbol::should_add_dynsym_entry() const | |
296 | { | |
297 | // If the symbol is used by a dynamic relocation, we need to add it. | |
298 | if (this->needs_dynsym_entry()) | |
299 | return true; | |
300 | ||
55a93433 ILT |
301 | // If the symbol was forced local in a version script, do not add it. |
302 | if (this->is_forced_local()) | |
303 | return false; | |
304 | ||
436ca963 ILT |
305 | // If exporting all symbols or building a shared library, |
306 | // and the symbol is defined in a regular object and is | |
307 | // externally visible, we need to add it. | |
8851ecca | 308 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
309 | && !this->is_from_dynobj() |
310 | && this->is_externally_visible()) | |
311 | return true; | |
312 | ||
313 | return false; | |
314 | } | |
315 | ||
b3b74ddc ILT |
316 | // Return true if the final value of this symbol is known at link |
317 | // time. | |
318 | ||
319 | bool | |
320 | Symbol::final_value_is_known() const | |
321 | { | |
322 | // If we are not generating an executable, then no final values are | |
323 | // known, since they will change at runtime. | |
8851ecca | 324 | if (parameters->options().shared() || parameters->options().relocatable()) |
b3b74ddc ILT |
325 | return false; |
326 | ||
f3e9c5c5 ILT |
327 | // If the symbol is not from an object file, and is not undefined, |
328 | // then it is defined, and known. | |
b3b74ddc | 329 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
330 | { |
331 | if (this->source_ != IS_UNDEFINED) | |
332 | return true; | |
333 | } | |
334 | else | |
335 | { | |
336 | // If the symbol is from a dynamic object, then the final value | |
337 | // is not known. | |
338 | if (this->object()->is_dynamic()) | |
339 | return false; | |
b3b74ddc | 340 | |
f3e9c5c5 ILT |
341 | // If the symbol is not undefined (it is defined or common), |
342 | // then the final value is known. | |
343 | if (!this->is_undefined()) | |
344 | return true; | |
345 | } | |
b3b74ddc ILT |
346 | |
347 | // If the symbol is undefined, then whether the final value is known | |
348 | // depends on whether we are doing a static link. If we are doing a | |
349 | // dynamic link, then the final value could be filled in at runtime. | |
350 | // This could reasonably be the case for a weak undefined symbol. | |
351 | return parameters->doing_static_link(); | |
352 | } | |
353 | ||
77e65537 | 354 | // Return the output section where this symbol is defined. |
a445fddf | 355 | |
77e65537 ILT |
356 | Output_section* |
357 | Symbol::output_section() const | |
a445fddf ILT |
358 | { |
359 | switch (this->source_) | |
360 | { | |
361 | case FROM_OBJECT: | |
77e65537 ILT |
362 | { |
363 | unsigned int shndx = this->u_.from_object.shndx; | |
d491d34e | 364 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) |
77e65537 ILT |
365 | { |
366 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 367 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 368 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
ef9beddf | 369 | return relobj->output_section(shndx); |
77e65537 ILT |
370 | } |
371 | return NULL; | |
372 | } | |
373 | ||
a445fddf | 374 | case IN_OUTPUT_DATA: |
77e65537 ILT |
375 | return this->u_.in_output_data.output_data->output_section(); |
376 | ||
a445fddf | 377 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
378 | case IS_CONSTANT: |
379 | case IS_UNDEFINED: | |
77e65537 ILT |
380 | return NULL; |
381 | ||
382 | default: | |
383 | gold_unreachable(); | |
384 | } | |
385 | } | |
386 | ||
387 | // Set the symbol's output section. This is used for symbols defined | |
388 | // in scripts. This should only be called after the symbol table has | |
389 | // been finalized. | |
390 | ||
391 | void | |
392 | Symbol::set_output_section(Output_section* os) | |
393 | { | |
394 | switch (this->source_) | |
395 | { | |
396 | case FROM_OBJECT: | |
397 | case IN_OUTPUT_DATA: | |
398 | gold_assert(this->output_section() == os); | |
399 | break; | |
f3e9c5c5 | 400 | case IS_CONSTANT: |
77e65537 ILT |
401 | this->source_ = IN_OUTPUT_DATA; |
402 | this->u_.in_output_data.output_data = os; | |
403 | this->u_.in_output_data.offset_is_from_end = false; | |
404 | break; | |
405 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 406 | case IS_UNDEFINED: |
a445fddf ILT |
407 | default: |
408 | gold_unreachable(); | |
409 | } | |
410 | } | |
411 | ||
14bfc3f5 ILT |
412 | // Class Symbol_table. |
413 | ||
09124467 ILT |
414 | Symbol_table::Symbol_table(unsigned int count, |
415 | const Version_script_info& version_script) | |
6d013333 | 416 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
155a0dd7 | 417 | forwarders_(), commons_(), tls_commons_(), forced_locals_(), warnings_(), |
55a93433 | 418 | version_script_(version_script) |
14bfc3f5 | 419 | { |
6d013333 | 420 | namepool_.reserve(count); |
14bfc3f5 ILT |
421 | } |
422 | ||
423 | Symbol_table::~Symbol_table() | |
424 | { | |
425 | } | |
426 | ||
ad8f37d1 | 427 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 428 | |
ad8f37d1 | 429 | inline size_t |
14bfc3f5 ILT |
430 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
431 | { | |
f0641a0b | 432 | return key.first ^ key.second; |
14bfc3f5 ILT |
433 | } |
434 | ||
ad8f37d1 ILT |
435 | // The symbol table key equality function. This is called with |
436 | // Stringpool keys. | |
14bfc3f5 | 437 | |
ad8f37d1 | 438 | inline bool |
14bfc3f5 ILT |
439 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
440 | const Symbol_table_key& k2) const | |
441 | { | |
442 | return k1.first == k2.first && k1.second == k2.second; | |
443 | } | |
444 | ||
dd8670e5 | 445 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
446 | |
447 | void | |
448 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
449 | { | |
a3ad94ed ILT |
450 | gold_assert(from != to); |
451 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
452 | this->forwarders_[from] = to; |
453 | from->set_forwarder(); | |
454 | } | |
455 | ||
61ba1cf9 ILT |
456 | // Resolve the forwards from FROM, returning the real symbol. |
457 | ||
14bfc3f5 | 458 | Symbol* |
c06b7b0b | 459 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 460 | { |
a3ad94ed | 461 | gold_assert(from->is_forwarder()); |
c06b7b0b | 462 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 463 | this->forwarders_.find(from); |
a3ad94ed | 464 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
465 | return p->second; |
466 | } | |
467 | ||
61ba1cf9 ILT |
468 | // Look up a symbol by name. |
469 | ||
470 | Symbol* | |
471 | Symbol_table::lookup(const char* name, const char* version) const | |
472 | { | |
f0641a0b ILT |
473 | Stringpool::Key name_key; |
474 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
475 | if (name == NULL) |
476 | return NULL; | |
f0641a0b ILT |
477 | |
478 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
479 | if (version != NULL) |
480 | { | |
f0641a0b | 481 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
482 | if (version == NULL) |
483 | return NULL; | |
484 | } | |
485 | ||
f0641a0b | 486 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
487 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
488 | if (p == this->table_.end()) | |
489 | return NULL; | |
490 | return p->second; | |
491 | } | |
492 | ||
14bfc3f5 ILT |
493 | // Resolve a Symbol with another Symbol. This is only used in the |
494 | // unusual case where there are references to both an unversioned | |
495 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
496 | // version is the default version. Because this is unusual, we do |
497 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 498 | |
1564db8d | 499 | template<int size, bool big_endian> |
14bfc3f5 | 500 | void |
95d14cd3 | 501 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 502 | { |
1564db8d ILT |
503 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
504 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 505 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
506 | esym.put_st_value(from->value()); |
507 | esym.put_st_size(from->symsize()); | |
508 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 509 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e ILT |
510 | bool is_ordinary; |
511 | unsigned int shndx = from->shndx(&is_ordinary); | |
512 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
95d14cd3 | 513 | from->version()); |
1ebd95fd ILT |
514 | if (from->in_reg()) |
515 | to->set_in_reg(); | |
516 | if (from->in_dyn()) | |
517 | to->set_in_dyn(); | |
14bfc3f5 ILT |
518 | } |
519 | ||
55a93433 ILT |
520 | // Record that a symbol is forced to be local by a version script. |
521 | ||
522 | void | |
523 | Symbol_table::force_local(Symbol* sym) | |
524 | { | |
525 | if (!sym->is_defined() && !sym->is_common()) | |
526 | return; | |
527 | if (sym->is_forced_local()) | |
528 | { | |
529 | // We already got this one. | |
530 | return; | |
531 | } | |
532 | sym->set_is_forced_local(); | |
533 | this->forced_locals_.push_back(sym); | |
534 | } | |
535 | ||
0864d551 ILT |
536 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
537 | // is only called for undefined symbols, when at least one --wrap | |
538 | // option was used. | |
539 | ||
540 | const char* | |
541 | Symbol_table::wrap_symbol(Object* object, const char* name, | |
542 | Stringpool::Key* name_key) | |
543 | { | |
544 | // For some targets, we need to ignore a specific character when | |
545 | // wrapping, and add it back later. | |
546 | char prefix = '\0'; | |
547 | if (name[0] == object->target()->wrap_char()) | |
548 | { | |
549 | prefix = name[0]; | |
550 | ++name; | |
551 | } | |
552 | ||
c5818ff1 | 553 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
554 | { |
555 | // Turn NAME into __wrap_NAME. | |
556 | std::string s; | |
557 | if (prefix != '\0') | |
558 | s += prefix; | |
559 | s += "__wrap_"; | |
560 | s += name; | |
561 | ||
562 | // This will give us both the old and new name in NAMEPOOL_, but | |
563 | // that is OK. Only the versions we need will wind up in the | |
564 | // real string table in the output file. | |
565 | return this->namepool_.add(s.c_str(), true, name_key); | |
566 | } | |
567 | ||
568 | const char* const real_prefix = "__real_"; | |
569 | const size_t real_prefix_length = strlen(real_prefix); | |
570 | if (strncmp(name, real_prefix, real_prefix_length) == 0 | |
c5818ff1 | 571 | && parameters->options().is_wrap(name + real_prefix_length)) |
0864d551 ILT |
572 | { |
573 | // Turn __real_NAME into NAME. | |
574 | std::string s; | |
575 | if (prefix != '\0') | |
576 | s += prefix; | |
577 | s += name + real_prefix_length; | |
578 | return this->namepool_.add(s.c_str(), true, name_key); | |
579 | } | |
580 | ||
581 | return name; | |
582 | } | |
583 | ||
14bfc3f5 ILT |
584 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
585 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
586 | // whether this is the default version. ST_SHNDX is the symbol's |
587 | // section index; IS_ORDINARY is whether this is a normal section | |
588 | // rather than a special code. | |
14bfc3f5 ILT |
589 | |
590 | // If DEF is true, then this is the definition of a default version of | |
591 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
592 | // of NAME/VERSION should always return the same symbol. This is | |
593 | // obvious for references, but in particular we want to do this for | |
594 | // definitions: overriding NAME/NULL should also override | |
595 | // NAME/VERSION. If we don't do that, it would be very hard to | |
596 | // override functions in a shared library which uses versioning. | |
597 | ||
598 | // We implement this by simply making both entries in the hash table | |
599 | // point to the same Symbol structure. That is easy enough if this is | |
600 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
601 | // that we have seen both already, in which case they will both have | |
602 | // independent entries in the symbol table. We can't simply change | |
603 | // the symbol table entry, because we have pointers to the entries | |
604 | // attached to the object files. So we mark the entry attached to the | |
605 | // object file as a forwarder, and record it in the forwarders_ map. | |
606 | // Note that entries in the hash table will never be marked as | |
607 | // forwarders. | |
70e654ba | 608 | // |
d491d34e ILT |
609 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
610 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
611 | // for a special section code. ST_SHNDX may be modified if the symbol | |
612 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
613 | |
614 | template<int size, bool big_endian> | |
aeddab66 | 615 | Sized_symbol<size>* |
f6ce93d6 | 616 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 617 | const char *name, |
f0641a0b ILT |
618 | Stringpool::Key name_key, |
619 | const char *version, | |
620 | Stringpool::Key version_key, | |
621 | bool def, | |
70e654ba | 622 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
623 | unsigned int st_shndx, |
624 | bool is_ordinary, | |
625 | unsigned int orig_st_shndx) | |
14bfc3f5 | 626 | { |
c5818ff1 CC |
627 | // Print a message if this symbol is being traced. |
628 | if (parameters->options().is_trace_symbol(name)) | |
629 | { | |
d491d34e | 630 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
c5818ff1 CC |
631 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
632 | else | |
633 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); | |
634 | } | |
635 | ||
0864d551 ILT |
636 | // For an undefined symbol, we may need to adjust the name using |
637 | // --wrap. | |
d491d34e | 638 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 639 | && parameters->options().any_wrap()) |
0864d551 ILT |
640 | { |
641 | const char* wrap_name = this->wrap_symbol(object, name, &name_key); | |
642 | if (wrap_name != name) | |
643 | { | |
644 | // If we see a reference to malloc with version GLIBC_2.0, | |
645 | // and we turn it into a reference to __wrap_malloc, then we | |
646 | // discard the version number. Otherwise the user would be | |
647 | // required to specify the correct version for | |
648 | // __wrap_malloc. | |
649 | version = NULL; | |
650 | version_key = 0; | |
651 | name = wrap_name; | |
652 | } | |
653 | } | |
654 | ||
14bfc3f5 ILT |
655 | Symbol* const snull = NULL; |
656 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
657 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
658 | snull)); | |
14bfc3f5 ILT |
659 | |
660 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
661 | std::make_pair(this->table_.end(), false); | |
662 | if (def) | |
663 | { | |
f0641a0b ILT |
664 | const Stringpool::Key vnull_key = 0; |
665 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
666 | vnull_key), | |
14bfc3f5 ILT |
667 | snull)); |
668 | } | |
669 | ||
670 | // ins.first: an iterator, which is a pointer to a pair. | |
671 | // ins.first->first: the key (a pair of name and version). | |
672 | // ins.first->second: the value (Symbol*). | |
673 | // ins.second: true if new entry was inserted, false if not. | |
674 | ||
1564db8d | 675 | Sized_symbol<size>* ret; |
ead1e424 ILT |
676 | bool was_undefined; |
677 | bool was_common; | |
14bfc3f5 ILT |
678 | if (!ins.second) |
679 | { | |
680 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 681 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 682 | gold_assert(ret != NULL); |
ead1e424 ILT |
683 | |
684 | was_undefined = ret->is_undefined(); | |
685 | was_common = ret->is_common(); | |
686 | ||
d491d34e ILT |
687 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
688 | version); | |
14bfc3f5 ILT |
689 | |
690 | if (def) | |
691 | { | |
692 | if (insdef.second) | |
693 | { | |
694 | // This is the first time we have seen NAME/NULL. Make | |
695 | // NAME/NULL point to NAME/VERSION. | |
696 | insdef.first->second = ret; | |
697 | } | |
a18f591e | 698 | else if (insdef.first->second != ret) |
14bfc3f5 ILT |
699 | { |
700 | // This is the unfortunate case where we already have | |
a18f591e ILT |
701 | // entries for both NAME/VERSION and NAME/NULL. We now |
702 | // see a symbol NAME/VERSION where VERSION is the | |
703 | // default version. We have already resolved this new | |
704 | // symbol with the existing NAME/VERSION symbol. | |
705 | ||
706 | // It's possible that NAME/NULL and NAME/VERSION are | |
707 | // both defined in regular objects. This can only | |
708 | // happen if one object file defines foo and another | |
709 | // defines foo@@ver. This is somewhat obscure, but we | |
710 | // call it a multiple definition error. | |
711 | ||
712 | // It's possible that NAME/NULL actually has a version, | |
713 | // in which case it won't be the same as VERSION. This | |
714 | // happens with ver_test_7.so in the testsuite for the | |
715 | // symbol t2_2. We see t2_2@@VER2, so we define both | |
716 | // t2_2/VER2 and t2_2/NULL. We then see an unadorned | |
717 | // t2_2 in an object file and give it version VER1 from | |
718 | // the version script. This looks like a default | |
719 | // definition for VER1, so it looks like we should merge | |
720 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, | |
721 | // but it's not obvious that this is an error, either. | |
722 | // So we just punt. | |
723 | ||
724 | // If one of the symbols has non-default visibility, and | |
725 | // the other is defined in a shared object, then they | |
726 | // are different symbols. | |
727 | ||
728 | // Otherwise, we just resolve the symbols as though they | |
729 | // were the same. | |
730 | ||
731 | if (insdef.first->second->version() != NULL) | |
732 | { | |
733 | gold_assert(insdef.first->second->version() != version); | |
734 | def = false; | |
735 | } | |
736 | else if (ret->visibility() != elfcpp::STV_DEFAULT | |
737 | && insdef.first->second->is_from_dynobj()) | |
738 | def = false; | |
739 | else if (insdef.first->second->visibility() != elfcpp::STV_DEFAULT | |
740 | && ret->is_from_dynobj()) | |
741 | def = false; | |
742 | else | |
743 | { | |
744 | const Sized_symbol<size>* sym2; | |
745 | sym2 = this->get_sized_symbol<size>(insdef.first->second); | |
95d14cd3 | 746 | Symbol_table::resolve<size, big_endian>(ret, sym2); |
a18f591e ILT |
747 | this->make_forwarder(insdef.first->second, ret); |
748 | insdef.first->second = ret; | |
749 | } | |
14bfc3f5 | 750 | } |
479f6503 ILT |
751 | else |
752 | def = false; | |
14bfc3f5 ILT |
753 | } |
754 | } | |
755 | else | |
756 | { | |
757 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 758 | gold_assert(ins.first->second == NULL); |
ead1e424 | 759 | |
14bfc3f5 ILT |
760 | if (def && !insdef.second) |
761 | { | |
14b31740 ILT |
762 | // We already have an entry for NAME/NULL. If we override |
763 | // it, then change it to NAME/VERSION. | |
7d1a9ebb | 764 | ret = this->get_sized_symbol<size>(insdef.first->second); |
18e6b24e ILT |
765 | |
766 | was_undefined = ret->is_undefined(); | |
767 | was_common = ret->is_common(); | |
768 | ||
d491d34e ILT |
769 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
770 | version); | |
14bfc3f5 ILT |
771 | ins.first->second = ret; |
772 | } | |
773 | else | |
774 | { | |
18e6b24e ILT |
775 | was_undefined = false; |
776 | was_common = false; | |
777 | ||
f6ce93d6 | 778 | Sized_target<size, big_endian>* target = |
7d1a9ebb | 779 | object->sized_target<size, big_endian>(); |
1564db8d ILT |
780 | if (!target->has_make_symbol()) |
781 | ret = new Sized_symbol<size>(); | |
782 | else | |
14bfc3f5 | 783 | { |
1564db8d ILT |
784 | ret = target->make_symbol(); |
785 | if (ret == NULL) | |
14bfc3f5 ILT |
786 | { |
787 | // This means that we don't want a symbol table | |
788 | // entry after all. | |
789 | if (!def) | |
790 | this->table_.erase(ins.first); | |
791 | else | |
792 | { | |
793 | this->table_.erase(insdef.first); | |
794 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
795 | this->table_.erase(std::make_pair(name_key, |
796 | version_key)); | |
14bfc3f5 ILT |
797 | } |
798 | return NULL; | |
799 | } | |
800 | } | |
14bfc3f5 | 801 | |
f3e9c5c5 | 802 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 803 | |
14bfc3f5 ILT |
804 | ins.first->second = ret; |
805 | if (def) | |
806 | { | |
807 | // This is the first time we have seen NAME/NULL. Point | |
808 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 809 | gold_assert(insdef.second); |
14bfc3f5 ILT |
810 | insdef.first->second = ret; |
811 | } | |
812 | } | |
813 | } | |
814 | ||
ead1e424 ILT |
815 | // Record every time we see a new undefined symbol, to speed up |
816 | // archive groups. | |
817 | if (!was_undefined && ret->is_undefined()) | |
818 | ++this->saw_undefined_; | |
819 | ||
820 | // Keep track of common symbols, to speed up common symbol | |
821 | // allocation. | |
822 | if (!was_common && ret->is_common()) | |
155a0dd7 ILT |
823 | { |
824 | if (ret->type() != elfcpp::STT_TLS) | |
825 | this->commons_.push_back(ret); | |
826 | else | |
827 | this->tls_commons_.push_back(ret); | |
828 | } | |
ead1e424 | 829 | |
be3e6201 ILT |
830 | if (def) |
831 | ret->set_is_default(); | |
14bfc3f5 ILT |
832 | return ret; |
833 | } | |
834 | ||
f6ce93d6 | 835 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
836 | |
837 | template<int size, bool big_endian> | |
838 | void | |
dbe717ef ILT |
839 | Symbol_table::add_from_relobj( |
840 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 841 | const unsigned char* syms, |
14bfc3f5 | 842 | size_t count, |
d491d34e | 843 | size_t symndx_offset, |
14bfc3f5 ILT |
844 | const char* sym_names, |
845 | size_t sym_name_size, | |
92de84a6 ILT |
846 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, |
847 | size_t *defined) | |
14bfc3f5 | 848 | { |
92de84a6 ILT |
849 | *defined = 0; |
850 | ||
9025d29d | 851 | gold_assert(size == relobj->target()->get_size()); |
8851ecca | 852 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 853 | |
a783673b ILT |
854 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
855 | ||
88dd47ac ILT |
856 | const bool just_symbols = relobj->just_symbols(); |
857 | ||
f6ce93d6 | 858 | const unsigned char* p = syms; |
a783673b | 859 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 860 | { |
92de84a6 ILT |
861 | (*sympointers)[i] = NULL; |
862 | ||
14bfc3f5 ILT |
863 | elfcpp::Sym<size, big_endian> sym(p); |
864 | ||
d491d34e | 865 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
866 | if (st_name >= sym_name_size) |
867 | { | |
75f2446e ILT |
868 | relobj->error(_("bad global symbol name offset %u at %zu"), |
869 | st_name, i); | |
870 | continue; | |
14bfc3f5 ILT |
871 | } |
872 | ||
dbe717ef ILT |
873 | const char* name = sym_names + st_name; |
874 | ||
d491d34e ILT |
875 | bool is_ordinary; |
876 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
877 | sym.get_st_shndx(), | |
878 | &is_ordinary); | |
879 | unsigned int orig_st_shndx = st_shndx; | |
880 | if (!is_ordinary) | |
881 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
882 | ||
92de84a6 ILT |
883 | if (st_shndx != elfcpp::SHN_UNDEF) |
884 | ++*defined; | |
885 | ||
a783673b ILT |
886 | // A symbol defined in a section which we are not including must |
887 | // be treated as an undefined symbol. | |
a783673b | 888 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 889 | && is_ordinary |
dbe717ef | 890 | && !relobj->is_section_included(st_shndx)) |
d491d34e | 891 | st_shndx = elfcpp::SHN_UNDEF; |
a783673b | 892 | |
14bfc3f5 ILT |
893 | // In an object file, an '@' in the name separates the symbol |
894 | // name from the version name. If there are two '@' characters, | |
895 | // this is the default version. | |
896 | const char* ver = strchr(name, '@'); | |
057ead22 | 897 | Stringpool::Key ver_key = 0; |
09124467 | 898 | int namelen = 0; |
55a93433 | 899 | // DEF: is the version default? LOCAL: is the symbol forced local? |
09124467 | 900 | bool def = false; |
55a93433 | 901 | bool local = false; |
09124467 ILT |
902 | |
903 | if (ver != NULL) | |
904 | { | |
905 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
906 | namelen = ver - name; | |
907 | ++ver; | |
908 | if (*ver == '@') | |
909 | { | |
910 | def = true; | |
911 | ++ver; | |
912 | } | |
057ead22 | 913 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 914 | } |
5871526f ILT |
915 | // We don't want to assign a version to an undefined symbol, |
916 | // even if it is listed in the version script. FIXME: What | |
917 | // about a common symbol? | |
057ead22 ILT |
918 | else |
919 | { | |
920 | namelen = strlen(name); | |
921 | if (!this->version_script_.empty() | |
922 | && st_shndx != elfcpp::SHN_UNDEF) | |
923 | { | |
924 | // The symbol name did not have a version, but the | |
925 | // version script may assign a version anyway. | |
926 | std::string version; | |
927 | if (this->version_script_.get_symbol_version(name, &version)) | |
928 | { | |
929 | // The version can be empty if the version script is | |
930 | // only used to force some symbols to be local. | |
931 | if (!version.empty()) | |
932 | { | |
933 | ver = this->namepool_.add_with_length(version.c_str(), | |
934 | version.length(), | |
935 | true, | |
936 | &ver_key); | |
937 | def = true; | |
938 | } | |
939 | } | |
940 | else if (this->version_script_.symbol_is_local(name)) | |
941 | local = true; | |
942 | } | |
943 | } | |
14bfc3f5 | 944 | |
d491d34e ILT |
945 | elfcpp::Sym<size, big_endian>* psym = &sym; |
946 | unsigned char symbuf[sym_size]; | |
947 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
948 | if (just_symbols) |
949 | { | |
d491d34e | 950 | memcpy(symbuf, p, sym_size); |
88dd47ac | 951 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
d491d34e | 952 | if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary) |
88dd47ac ILT |
953 | { |
954 | // Symbol values in object files are section relative. | |
955 | // This is normally what we want, but since here we are | |
956 | // converting the symbol to absolute we need to add the | |
957 | // section address. The section address in an object | |
958 | // file is normally zero, but people can use a linker | |
959 | // script to change it. | |
d491d34e ILT |
960 | sw.put_st_value(sym.get_st_value() |
961 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 962 | } |
d491d34e ILT |
963 | st_shndx = elfcpp::SHN_ABS; |
964 | is_ordinary = false; | |
88dd47ac ILT |
965 | psym = &sym2; |
966 | } | |
967 | ||
057ead22 ILT |
968 | Stringpool::Key name_key; |
969 | name = this->namepool_.add_with_length(name, namelen, true, | |
970 | &name_key); | |
971 | ||
aeddab66 | 972 | Sized_symbol<size>* res; |
057ead22 ILT |
973 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
974 | def, *psym, st_shndx, is_ordinary, | |
975 | orig_st_shndx); | |
f0641a0b | 976 | |
057ead22 ILT |
977 | if (local) |
978 | this->force_local(res); | |
14bfc3f5 | 979 | |
730cdc88 | 980 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
981 | } |
982 | } | |
983 | ||
89fc3421 CC |
984 | // Add a symbol from a plugin-claimed file. |
985 | ||
986 | template<int size, bool big_endian> | |
987 | Symbol* | |
988 | Symbol_table::add_from_pluginobj( | |
989 | Sized_pluginobj<size, big_endian>* obj, | |
990 | const char* name, | |
991 | const char* ver, | |
992 | elfcpp::Sym<size, big_endian>* sym) | |
993 | { | |
994 | unsigned int st_shndx = sym->get_st_shndx(); | |
995 | ||
996 | Stringpool::Key ver_key = 0; | |
997 | bool def = false; | |
998 | bool local = false; | |
999 | ||
1000 | if (ver != NULL) | |
1001 | { | |
1002 | ver = this->namepool_.add(ver, true, &ver_key); | |
1003 | } | |
1004 | // We don't want to assign a version to an undefined symbol, | |
1005 | // even if it is listed in the version script. FIXME: What | |
1006 | // about a common symbol? | |
1007 | else | |
1008 | { | |
1009 | if (!this->version_script_.empty() | |
1010 | && st_shndx != elfcpp::SHN_UNDEF) | |
1011 | { | |
1012 | // The symbol name did not have a version, but the | |
1013 | // version script may assign a version anyway. | |
1014 | std::string version; | |
1015 | if (this->version_script_.get_symbol_version(name, &version)) | |
1016 | { | |
1017 | // The version can be empty if the version script is | |
1018 | // only used to force some symbols to be local. | |
1019 | if (!version.empty()) | |
1020 | { | |
1021 | ver = this->namepool_.add_with_length(version.c_str(), | |
1022 | version.length(), | |
1023 | true, | |
1024 | &ver_key); | |
1025 | def = true; | |
1026 | } | |
1027 | } | |
1028 | else if (this->version_script_.symbol_is_local(name)) | |
1029 | local = true; | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | Stringpool::Key name_key; | |
1034 | name = this->namepool_.add(name, true, &name_key); | |
1035 | ||
1036 | Sized_symbol<size>* res; | |
1037 | res = this->add_from_object(obj, name, name_key, ver, ver_key, | |
1038 | def, *sym, st_shndx, true, st_shndx); | |
1039 | ||
1040 | if (local) | |
1041 | this->force_local(res); | |
1042 | ||
1043 | return res; | |
1044 | } | |
1045 | ||
dbe717ef ILT |
1046 | // Add all the symbols in a dynamic object to the hash table. |
1047 | ||
1048 | template<int size, bool big_endian> | |
1049 | void | |
1050 | Symbol_table::add_from_dynobj( | |
1051 | Sized_dynobj<size, big_endian>* dynobj, | |
1052 | const unsigned char* syms, | |
1053 | size_t count, | |
1054 | const char* sym_names, | |
1055 | size_t sym_name_size, | |
1056 | const unsigned char* versym, | |
1057 | size_t versym_size, | |
92de84a6 ILT |
1058 | const std::vector<const char*>* version_map, |
1059 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, | |
1060 | size_t* defined) | |
dbe717ef | 1061 | { |
92de84a6 ILT |
1062 | *defined = 0; |
1063 | ||
9025d29d | 1064 | gold_assert(size == dynobj->target()->get_size()); |
8851ecca | 1065 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1066 | |
88dd47ac ILT |
1067 | if (dynobj->just_symbols()) |
1068 | { | |
1069 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1070 | return; | |
1071 | } | |
1072 | ||
dbe717ef ILT |
1073 | if (versym != NULL && versym_size / 2 < count) |
1074 | { | |
75f2446e ILT |
1075 | dynobj->error(_("too few symbol versions")); |
1076 | return; | |
dbe717ef ILT |
1077 | } |
1078 | ||
1079 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1080 | ||
aeddab66 ILT |
1081 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1082 | // weak aliases. This is necessary because if the dynamic object | |
1083 | // provides the same variable under two names, one of which is a | |
1084 | // weak definition, and the regular object refers to the weak | |
1085 | // definition, we have to put both the weak definition and the | |
1086 | // strong definition into the dynamic symbol table. Given a weak | |
1087 | // definition, the only way that we can find the corresponding | |
1088 | // strong definition, if any, is to search the symbol table. | |
1089 | std::vector<Sized_symbol<size>*> object_symbols; | |
1090 | ||
dbe717ef ILT |
1091 | const unsigned char* p = syms; |
1092 | const unsigned char* vs = versym; | |
1093 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1094 | { | |
1095 | elfcpp::Sym<size, big_endian> sym(p); | |
1096 | ||
92de84a6 ILT |
1097 | if (sympointers != NULL) |
1098 | (*sympointers)[i] = NULL; | |
1099 | ||
65778909 ILT |
1100 | // Ignore symbols with local binding or that have |
1101 | // internal or hidden visibility. | |
1102 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1103 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1104 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1105 | continue; |
1106 | ||
8bdcdf2c ILT |
1107 | // A protected symbol in a shared library must be treated as a |
1108 | // normal symbol when viewed from outside the shared library. | |
1109 | // Implement this by overriding the visibility here. | |
1110 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1111 | unsigned char symbuf[sym_size]; | |
1112 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1113 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1114 | { | |
1115 | memcpy(symbuf, p, sym_size); | |
1116 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1117 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1118 | psym = &sym2; | |
1119 | } | |
1120 | ||
1121 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1122 | if (st_name >= sym_name_size) |
1123 | { | |
75f2446e ILT |
1124 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1125 | st_name, i); | |
1126 | continue; | |
dbe717ef ILT |
1127 | } |
1128 | ||
1129 | const char* name = sym_names + st_name; | |
1130 | ||
d491d34e | 1131 | bool is_ordinary; |
8bdcdf2c | 1132 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1133 | &is_ordinary); |
1134 | ||
92de84a6 ILT |
1135 | if (st_shndx != elfcpp::SHN_UNDEF) |
1136 | ++*defined; | |
1137 | ||
aeddab66 ILT |
1138 | Sized_symbol<size>* res; |
1139 | ||
dbe717ef ILT |
1140 | if (versym == NULL) |
1141 | { | |
1142 | Stringpool::Key name_key; | |
cfd73a4e | 1143 | name = this->namepool_.add(name, true, &name_key); |
aeddab66 | 1144 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1145 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1146 | st_shndx); |
dbe717ef | 1147 | } |
aeddab66 ILT |
1148 | else |
1149 | { | |
1150 | // Read the version information. | |
dbe717ef | 1151 | |
aeddab66 | 1152 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1153 | |
aeddab66 ILT |
1154 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1155 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1156 | |
aeddab66 ILT |
1157 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1158 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1159 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1160 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1161 | // for an undefined symbol. I don't know what the Sun | |
1162 | // linker will generate. | |
dbe717ef | 1163 | |
aeddab66 | 1164 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1165 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1166 | { |
1167 | // This symbol should not be visible outside the object. | |
1168 | continue; | |
1169 | } | |
64707334 | 1170 | |
aeddab66 ILT |
1171 | // At this point we are definitely going to add this symbol. |
1172 | Stringpool::Key name_key; | |
1173 | name = this->namepool_.add(name, true, &name_key); | |
dbe717ef | 1174 | |
aeddab66 ILT |
1175 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1176 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1177 | { | |
1178 | // This symbol does not have a version. | |
1179 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1180 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1181 | st_shndx); |
aeddab66 ILT |
1182 | } |
1183 | else | |
1184 | { | |
1185 | if (v >= version_map->size()) | |
1186 | { | |
1187 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1188 | i, v); | |
1189 | continue; | |
1190 | } | |
dbe717ef | 1191 | |
aeddab66 ILT |
1192 | const char* version = (*version_map)[v]; |
1193 | if (version == NULL) | |
1194 | { | |
1195 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1196 | i, v); | |
1197 | continue; | |
1198 | } | |
dbe717ef | 1199 | |
aeddab66 ILT |
1200 | Stringpool::Key version_key; |
1201 | version = this->namepool_.add(version, true, &version_key); | |
1202 | ||
1203 | // If this is an absolute symbol, and the version name | |
1204 | // and symbol name are the same, then this is the | |
1205 | // version definition symbol. These symbols exist to | |
1206 | // support using -u to pull in particular versions. We | |
1207 | // do not want to record a version for them. | |
d491d34e ILT |
1208 | if (st_shndx == elfcpp::SHN_ABS |
1209 | && !is_ordinary | |
aeddab66 ILT |
1210 | && name_key == version_key) |
1211 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1212 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1213 | st_shndx); |
aeddab66 ILT |
1214 | else |
1215 | { | |
1216 | const bool def = (!hidden | |
d491d34e | 1217 | && st_shndx != elfcpp::SHN_UNDEF); |
aeddab66 | 1218 | res = this->add_from_object(dynobj, name, name_key, version, |
8bdcdf2c | 1219 | version_key, def, *psym, st_shndx, |
d491d34e | 1220 | is_ordinary, st_shndx); |
aeddab66 ILT |
1221 | } |
1222 | } | |
dbe717ef ILT |
1223 | } |
1224 | ||
99a37bfd | 1225 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1226 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1227 | if (st_shndx != elfcpp::SHN_UNDEF |
1228 | && is_ordinary | |
8bdcdf2c | 1229 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1230 | && res->source() == Symbol::FROM_OBJECT |
1231 | && res->object() == dynobj) | |
aeddab66 | 1232 | object_symbols.push_back(res); |
92de84a6 ILT |
1233 | |
1234 | if (sympointers != NULL) | |
1235 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1236 | } |
1237 | ||
1238 | this->record_weak_aliases(&object_symbols); | |
1239 | } | |
1240 | ||
1241 | // This is used to sort weak aliases. We sort them first by section | |
1242 | // index, then by offset, then by weak ahead of strong. | |
1243 | ||
1244 | template<int size> | |
1245 | class Weak_alias_sorter | |
1246 | { | |
1247 | public: | |
1248 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1249 | }; | |
1250 | ||
1251 | template<int size> | |
1252 | bool | |
1253 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1254 | const Sized_symbol<size>* s2) const | |
1255 | { | |
d491d34e ILT |
1256 | bool is_ordinary; |
1257 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1258 | gold_assert(is_ordinary); | |
1259 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1260 | gold_assert(is_ordinary); | |
1261 | if (s1_shndx != s2_shndx) | |
1262 | return s1_shndx < s2_shndx; | |
1263 | ||
aeddab66 ILT |
1264 | if (s1->value() != s2->value()) |
1265 | return s1->value() < s2->value(); | |
1266 | if (s1->binding() != s2->binding()) | |
1267 | { | |
1268 | if (s1->binding() == elfcpp::STB_WEAK) | |
1269 | return true; | |
1270 | if (s2->binding() == elfcpp::STB_WEAK) | |
1271 | return false; | |
1272 | } | |
1273 | return std::string(s1->name()) < std::string(s2->name()); | |
1274 | } | |
dbe717ef | 1275 | |
aeddab66 ILT |
1276 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1277 | // for any weak aliases, and record them so that if we add the weak | |
1278 | // alias to the dynamic symbol table, we also add the corresponding | |
1279 | // strong symbol. | |
dbe717ef | 1280 | |
aeddab66 ILT |
1281 | template<int size> |
1282 | void | |
1283 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1284 | { | |
1285 | // Sort the vector by section index, then by offset, then by weak | |
1286 | // ahead of strong. | |
1287 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1288 | ||
1289 | // Walk through the vector. For each weak definition, record | |
1290 | // aliases. | |
1291 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1292 | symbols->begin(); | |
1293 | p != symbols->end(); | |
1294 | ++p) | |
1295 | { | |
1296 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1297 | continue; | |
1298 | ||
1299 | // Build a circular list of weak aliases. Each symbol points to | |
1300 | // the next one in the circular list. | |
1301 | ||
1302 | Sized_symbol<size>* from_sym = *p; | |
1303 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1304 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1305 | { |
d491d34e ILT |
1306 | bool dummy; |
1307 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1308 | || (*q)->value() != from_sym->value()) |
1309 | break; | |
1310 | ||
1311 | this->weak_aliases_[from_sym] = *q; | |
1312 | from_sym->set_has_alias(); | |
1313 | from_sym = *q; | |
dbe717ef ILT |
1314 | } |
1315 | ||
aeddab66 ILT |
1316 | if (from_sym != *p) |
1317 | { | |
1318 | this->weak_aliases_[from_sym] = *p; | |
1319 | from_sym->set_has_alias(); | |
1320 | } | |
dbe717ef | 1321 | |
aeddab66 | 1322 | p = q - 1; |
dbe717ef ILT |
1323 | } |
1324 | } | |
1325 | ||
ead1e424 ILT |
1326 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1327 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1328 | // If this does not return NULL, it sets *POLDSYM to the existing |
306d9ef0 | 1329 | // symbol if there is one. This canonicalizes *PNAME and *PVERSION. |
ead1e424 ILT |
1330 | |
1331 | template<int size, bool big_endian> | |
1332 | Sized_symbol<size>* | |
9b07f471 ILT |
1333 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1334 | bool only_if_ref, | |
7d1a9ebb | 1335 | Sized_symbol<size>** poldsym) |
ead1e424 | 1336 | { |
ead1e424 ILT |
1337 | Symbol* oldsym; |
1338 | Sized_symbol<size>* sym; | |
86f2e683 ILT |
1339 | bool add_to_table = false; |
1340 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
ead1e424 | 1341 | |
55a93433 ILT |
1342 | // If the caller didn't give us a version, see if we get one from |
1343 | // the version script. | |
057ead22 | 1344 | std::string v; |
55a93433 ILT |
1345 | if (*pversion == NULL) |
1346 | { | |
057ead22 ILT |
1347 | if (this->version_script_.get_symbol_version(*pname, &v)) |
1348 | { | |
1349 | if (!v.empty()) | |
1350 | *pversion = v.c_str(); | |
1351 | } | |
55a93433 ILT |
1352 | } |
1353 | ||
ead1e424 ILT |
1354 | if (only_if_ref) |
1355 | { | |
306d9ef0 | 1356 | oldsym = this->lookup(*pname, *pversion); |
f6ce93d6 | 1357 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1358 | return NULL; |
306d9ef0 ILT |
1359 | |
1360 | *pname = oldsym->name(); | |
1361 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1362 | } |
1363 | else | |
1364 | { | |
14b31740 | 1365 | // Canonicalize NAME and VERSION. |
f0641a0b | 1366 | Stringpool::Key name_key; |
cfd73a4e | 1367 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1368 | |
14b31740 | 1369 | Stringpool::Key version_key = 0; |
306d9ef0 | 1370 | if (*pversion != NULL) |
cfd73a4e | 1371 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1372 | |
ead1e424 | 1373 | Symbol* const snull = NULL; |
ead1e424 | 1374 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1375 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1376 | version_key), | |
ead1e424 ILT |
1377 | snull)); |
1378 | ||
1379 | if (!ins.second) | |
1380 | { | |
14b31740 | 1381 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1382 | oldsym = ins.first->second; |
a3ad94ed | 1383 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
1384 | } |
1385 | else | |
1386 | { | |
1387 | // We haven't seen this symbol before. | |
a3ad94ed | 1388 | gold_assert(ins.first->second == NULL); |
86f2e683 ILT |
1389 | add_to_table = true; |
1390 | add_loc = ins.first; | |
ead1e424 ILT |
1391 | oldsym = NULL; |
1392 | } | |
1393 | } | |
1394 | ||
8851ecca ILT |
1395 | const Target& target = parameters->target(); |
1396 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1397 | sym = new Sized_symbol<size>(); |
1398 | else | |
ead1e424 | 1399 | { |
8851ecca ILT |
1400 | gold_assert(target.get_size() == size); |
1401 | gold_assert(target.is_big_endian() ? big_endian : !big_endian); | |
86f2e683 ILT |
1402 | typedef Sized_target<size, big_endian> My_target; |
1403 | const My_target* sized_target = | |
8851ecca | 1404 | static_cast<const My_target*>(&target); |
86f2e683 ILT |
1405 | sym = sized_target->make_symbol(); |
1406 | if (sym == NULL) | |
1407 | return NULL; | |
1408 | } | |
ead1e424 | 1409 | |
86f2e683 ILT |
1410 | if (add_to_table) |
1411 | add_loc->second = sym; | |
1412 | else | |
1413 | gold_assert(oldsym != NULL); | |
ead1e424 | 1414 | |
7d1a9ebb | 1415 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1416 | |
1417 | return sym; | |
1418 | } | |
1419 | ||
1420 | // Define a symbol based on an Output_data. | |
1421 | ||
14b31740 | 1422 | Symbol* |
9b07f471 ILT |
1423 | Symbol_table::define_in_output_data(const char* name, |
1424 | const char* version, | |
1425 | Output_data* od, | |
1426 | uint64_t value, | |
1427 | uint64_t symsize, | |
1428 | elfcpp::STT type, | |
1429 | elfcpp::STB binding, | |
ead1e424 ILT |
1430 | elfcpp::STV visibility, |
1431 | unsigned char nonvis, | |
1432 | bool offset_is_from_end, | |
1433 | bool only_if_ref) | |
1434 | { | |
8851ecca | 1435 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1436 | { |
1437 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1438 | return this->do_define_in_output_data<32>(name, version, od, |
86f2e683 ILT |
1439 | value, symsize, type, binding, |
1440 | visibility, nonvis, | |
1441 | offset_is_from_end, | |
1442 | only_if_ref); | |
1443 | #else | |
1444 | gold_unreachable(); | |
1445 | #endif | |
1446 | } | |
8851ecca | 1447 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1448 | { |
1449 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1450 | return this->do_define_in_output_data<64>(name, version, od, |
86f2e683 ILT |
1451 | value, symsize, type, binding, |
1452 | visibility, nonvis, | |
1453 | offset_is_from_end, | |
1454 | only_if_ref); | |
1455 | #else | |
1456 | gold_unreachable(); | |
1457 | #endif | |
1458 | } | |
ead1e424 | 1459 | else |
a3ad94ed | 1460 | gold_unreachable(); |
ead1e424 ILT |
1461 | } |
1462 | ||
1463 | // Define a symbol in an Output_data, sized version. | |
1464 | ||
1465 | template<int size> | |
14b31740 | 1466 | Sized_symbol<size>* |
ead1e424 | 1467 | Symbol_table::do_define_in_output_data( |
ead1e424 | 1468 | const char* name, |
14b31740 | 1469 | const char* version, |
ead1e424 ILT |
1470 | Output_data* od, |
1471 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1472 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1473 | elfcpp::STT type, | |
1474 | elfcpp::STB binding, | |
1475 | elfcpp::STV visibility, | |
1476 | unsigned char nonvis, | |
1477 | bool offset_is_from_end, | |
1478 | bool only_if_ref) | |
1479 | { | |
1480 | Sized_symbol<size>* sym; | |
86f2e683 | 1481 | Sized_symbol<size>* oldsym; |
ead1e424 | 1482 | |
8851ecca | 1483 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1484 | { |
1485 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1486 | sym = this->define_special_symbol<size, true>(&name, &version, |
1487 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1488 | #else |
1489 | gold_unreachable(); | |
1490 | #endif | |
1491 | } | |
ead1e424 | 1492 | else |
193a53d9 ILT |
1493 | { |
1494 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1495 | sym = this->define_special_symbol<size, false>(&name, &version, |
1496 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1497 | #else |
1498 | gold_unreachable(); | |
1499 | #endif | |
1500 | } | |
ead1e424 ILT |
1501 | |
1502 | if (sym == NULL) | |
14b31740 | 1503 | return NULL; |
ead1e424 | 1504 | |
75517b77 ILT |
1505 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
1506 | visibility, nonvis, offset_is_from_end); | |
14b31740 | 1507 | |
e5756efb | 1508 | if (oldsym == NULL) |
55a93433 ILT |
1509 | { |
1510 | if (binding == elfcpp::STB_LOCAL | |
1511 | || this->version_script_.symbol_is_local(name)) | |
1512 | this->force_local(sym); | |
75517b77 ILT |
1513 | else if (version != NULL) |
1514 | sym->set_is_default(); | |
55a93433 ILT |
1515 | return sym; |
1516 | } | |
86f2e683 | 1517 | |
e5756efb ILT |
1518 | if (Symbol_table::should_override_with_special(oldsym)) |
1519 | this->override_with_special(oldsym, sym); | |
1520 | delete sym; | |
1521 | return oldsym; | |
ead1e424 ILT |
1522 | } |
1523 | ||
1524 | // Define a symbol based on an Output_segment. | |
1525 | ||
14b31740 | 1526 | Symbol* |
9b07f471 | 1527 | Symbol_table::define_in_output_segment(const char* name, |
14b31740 | 1528 | const char* version, Output_segment* os, |
9b07f471 ILT |
1529 | uint64_t value, |
1530 | uint64_t symsize, | |
1531 | elfcpp::STT type, | |
1532 | elfcpp::STB binding, | |
ead1e424 ILT |
1533 | elfcpp::STV visibility, |
1534 | unsigned char nonvis, | |
1535 | Symbol::Segment_offset_base offset_base, | |
1536 | bool only_if_ref) | |
1537 | { | |
8851ecca | 1538 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1539 | { |
1540 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1541 | return this->do_define_in_output_segment<32>(name, version, os, |
86f2e683 ILT |
1542 | value, symsize, type, |
1543 | binding, visibility, nonvis, | |
1544 | offset_base, only_if_ref); | |
1545 | #else | |
1546 | gold_unreachable(); | |
1547 | #endif | |
1548 | } | |
8851ecca | 1549 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1550 | { |
1551 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1552 | return this->do_define_in_output_segment<64>(name, version, os, |
86f2e683 ILT |
1553 | value, symsize, type, |
1554 | binding, visibility, nonvis, | |
1555 | offset_base, only_if_ref); | |
1556 | #else | |
1557 | gold_unreachable(); | |
1558 | #endif | |
1559 | } | |
ead1e424 | 1560 | else |
a3ad94ed | 1561 | gold_unreachable(); |
ead1e424 ILT |
1562 | } |
1563 | ||
1564 | // Define a symbol in an Output_segment, sized version. | |
1565 | ||
1566 | template<int size> | |
14b31740 | 1567 | Sized_symbol<size>* |
ead1e424 | 1568 | Symbol_table::do_define_in_output_segment( |
ead1e424 | 1569 | const char* name, |
14b31740 | 1570 | const char* version, |
ead1e424 ILT |
1571 | Output_segment* os, |
1572 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1573 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1574 | elfcpp::STT type, | |
1575 | elfcpp::STB binding, | |
1576 | elfcpp::STV visibility, | |
1577 | unsigned char nonvis, | |
1578 | Symbol::Segment_offset_base offset_base, | |
1579 | bool only_if_ref) | |
1580 | { | |
1581 | Sized_symbol<size>* sym; | |
86f2e683 | 1582 | Sized_symbol<size>* oldsym; |
ead1e424 | 1583 | |
8851ecca | 1584 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1585 | { |
1586 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1587 | sym = this->define_special_symbol<size, true>(&name, &version, |
1588 | only_if_ref, &oldsym); | |
9025d29d ILT |
1589 | #else |
1590 | gold_unreachable(); | |
1591 | #endif | |
1592 | } | |
ead1e424 | 1593 | else |
9025d29d ILT |
1594 | { |
1595 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1596 | sym = this->define_special_symbol<size, false>(&name, &version, |
1597 | only_if_ref, &oldsym); | |
9025d29d ILT |
1598 | #else |
1599 | gold_unreachable(); | |
1600 | #endif | |
1601 | } | |
ead1e424 ILT |
1602 | |
1603 | if (sym == NULL) | |
14b31740 | 1604 | return NULL; |
ead1e424 | 1605 | |
75517b77 | 1606 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
f3e9c5c5 | 1607 | visibility, nonvis, offset_base); |
14b31740 | 1608 | |
e5756efb | 1609 | if (oldsym == NULL) |
55a93433 ILT |
1610 | { |
1611 | if (binding == elfcpp::STB_LOCAL | |
1612 | || this->version_script_.symbol_is_local(name)) | |
1613 | this->force_local(sym); | |
75517b77 ILT |
1614 | else if (version != NULL) |
1615 | sym->set_is_default(); | |
55a93433 ILT |
1616 | return sym; |
1617 | } | |
86f2e683 | 1618 | |
e5756efb ILT |
1619 | if (Symbol_table::should_override_with_special(oldsym)) |
1620 | this->override_with_special(oldsym, sym); | |
1621 | delete sym; | |
1622 | return oldsym; | |
ead1e424 ILT |
1623 | } |
1624 | ||
1625 | // Define a special symbol with a constant value. It is a multiple | |
1626 | // definition error if this symbol is already defined. | |
1627 | ||
14b31740 | 1628 | Symbol* |
9b07f471 ILT |
1629 | Symbol_table::define_as_constant(const char* name, |
1630 | const char* version, | |
1631 | uint64_t value, | |
1632 | uint64_t symsize, | |
1633 | elfcpp::STT type, | |
1634 | elfcpp::STB binding, | |
1635 | elfcpp::STV visibility, | |
1636 | unsigned char nonvis, | |
caa9d5d9 ILT |
1637 | bool only_if_ref, |
1638 | bool force_override) | |
ead1e424 | 1639 | { |
8851ecca | 1640 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1641 | { |
1642 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1643 | return this->do_define_as_constant<32>(name, version, value, |
86f2e683 | 1644 | symsize, type, binding, |
caa9d5d9 ILT |
1645 | visibility, nonvis, only_if_ref, |
1646 | force_override); | |
86f2e683 ILT |
1647 | #else |
1648 | gold_unreachable(); | |
1649 | #endif | |
1650 | } | |
8851ecca | 1651 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1652 | { |
1653 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1654 | return this->do_define_as_constant<64>(name, version, value, |
86f2e683 | 1655 | symsize, type, binding, |
caa9d5d9 ILT |
1656 | visibility, nonvis, only_if_ref, |
1657 | force_override); | |
86f2e683 ILT |
1658 | #else |
1659 | gold_unreachable(); | |
1660 | #endif | |
1661 | } | |
ead1e424 | 1662 | else |
a3ad94ed | 1663 | gold_unreachable(); |
ead1e424 ILT |
1664 | } |
1665 | ||
1666 | // Define a symbol as a constant, sized version. | |
1667 | ||
1668 | template<int size> | |
14b31740 | 1669 | Sized_symbol<size>* |
ead1e424 | 1670 | Symbol_table::do_define_as_constant( |
ead1e424 | 1671 | const char* name, |
14b31740 | 1672 | const char* version, |
ead1e424 ILT |
1673 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1674 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1675 | elfcpp::STT type, | |
1676 | elfcpp::STB binding, | |
1677 | elfcpp::STV visibility, | |
1678 | unsigned char nonvis, | |
caa9d5d9 ILT |
1679 | bool only_if_ref, |
1680 | bool force_override) | |
ead1e424 ILT |
1681 | { |
1682 | Sized_symbol<size>* sym; | |
86f2e683 | 1683 | Sized_symbol<size>* oldsym; |
ead1e424 | 1684 | |
8851ecca | 1685 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1686 | { |
1687 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1688 | sym = this->define_special_symbol<size, true>(&name, &version, |
1689 | only_if_ref, &oldsym); | |
9025d29d ILT |
1690 | #else |
1691 | gold_unreachable(); | |
1692 | #endif | |
1693 | } | |
ead1e424 | 1694 | else |
9025d29d ILT |
1695 | { |
1696 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1697 | sym = this->define_special_symbol<size, false>(&name, &version, |
1698 | only_if_ref, &oldsym); | |
9025d29d ILT |
1699 | #else |
1700 | gold_unreachable(); | |
1701 | #endif | |
1702 | } | |
ead1e424 ILT |
1703 | |
1704 | if (sym == NULL) | |
14b31740 | 1705 | return NULL; |
ead1e424 | 1706 | |
75517b77 ILT |
1707 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
1708 | nonvis); | |
14b31740 | 1709 | |
e5756efb | 1710 | if (oldsym == NULL) |
55a93433 | 1711 | { |
686c8caf ILT |
1712 | // Version symbols are absolute symbols with name == version. |
1713 | // We don't want to force them to be local. | |
1714 | if ((version == NULL | |
1715 | || name != version | |
1716 | || value != 0) | |
1717 | && (binding == elfcpp::STB_LOCAL | |
1718 | || this->version_script_.symbol_is_local(name))) | |
55a93433 | 1719 | this->force_local(sym); |
75517b77 ILT |
1720 | else if (version != NULL |
1721 | && (name != version || value != 0)) | |
1722 | sym->set_is_default(); | |
55a93433 ILT |
1723 | return sym; |
1724 | } | |
86f2e683 | 1725 | |
caa9d5d9 | 1726 | if (force_override || Symbol_table::should_override_with_special(oldsym)) |
e5756efb ILT |
1727 | this->override_with_special(oldsym, sym); |
1728 | delete sym; | |
1729 | return oldsym; | |
ead1e424 ILT |
1730 | } |
1731 | ||
1732 | // Define a set of symbols in output sections. | |
1733 | ||
1734 | void | |
9b07f471 | 1735 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1736 | const Define_symbol_in_section* p, |
1737 | bool only_if_ref) | |
ead1e424 ILT |
1738 | { |
1739 | for (int i = 0; i < count; ++i, ++p) | |
1740 | { | |
1741 | Output_section* os = layout->find_output_section(p->output_section); | |
1742 | if (os != NULL) | |
9b07f471 | 1743 | this->define_in_output_data(p->name, NULL, os, p->value, |
14b31740 ILT |
1744 | p->size, p->type, p->binding, |
1745 | p->visibility, p->nonvis, | |
a445fddf ILT |
1746 | p->offset_is_from_end, |
1747 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1748 | else |
9b07f471 | 1749 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1750 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1751 | only_if_ref || p->only_if_ref, |
1752 | false); | |
ead1e424 ILT |
1753 | } |
1754 | } | |
1755 | ||
1756 | // Define a set of symbols in output segments. | |
1757 | ||
1758 | void | |
9b07f471 | 1759 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1760 | const Define_symbol_in_segment* p, |
1761 | bool only_if_ref) | |
ead1e424 ILT |
1762 | { |
1763 | for (int i = 0; i < count; ++i, ++p) | |
1764 | { | |
1765 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
1766 | p->segment_flags_set, | |
1767 | p->segment_flags_clear); | |
1768 | if (os != NULL) | |
9b07f471 | 1769 | this->define_in_output_segment(p->name, NULL, os, p->value, |
14b31740 ILT |
1770 | p->size, p->type, p->binding, |
1771 | p->visibility, p->nonvis, | |
a445fddf ILT |
1772 | p->offset_base, |
1773 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1774 | else |
9b07f471 | 1775 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1776 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1777 | only_if_ref || p->only_if_ref, |
1778 | false); | |
ead1e424 ILT |
1779 | } |
1780 | } | |
1781 | ||
46fe1623 ILT |
1782 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
1783 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1784 | // the offset within POSD. | |
1785 | ||
1786 | template<int size> | |
1787 | void | |
fe8718a4 | 1788 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
1789 | Sized_symbol<size>* csym, |
1790 | Output_data* posd, | |
1791 | typename elfcpp::Elf_types<size>::Elf_Addr value) | |
46fe1623 ILT |
1792 | { |
1793 | gold_assert(csym->is_from_dynobj()); | |
1794 | gold_assert(!csym->is_copied_from_dynobj()); | |
1795 | Object* object = csym->object(); | |
1796 | gold_assert(object->is_dynamic()); | |
1797 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
1798 | ||
1799 | // Our copied variable has to override any variable in a shared | |
1800 | // library. | |
1801 | elfcpp::STB binding = csym->binding(); | |
1802 | if (binding == elfcpp::STB_WEAK) | |
1803 | binding = elfcpp::STB_GLOBAL; | |
1804 | ||
9b07f471 | 1805 | this->define_in_output_data(csym->name(), csym->version(), |
46fe1623 ILT |
1806 | posd, value, csym->symsize(), |
1807 | csym->type(), binding, | |
1808 | csym->visibility(), csym->nonvis(), | |
1809 | false, false); | |
1810 | ||
1811 | csym->set_is_copied_from_dynobj(); | |
1812 | csym->set_needs_dynsym_entry(); | |
1813 | ||
1814 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
1815 | ||
1816 | // We have now defined all aliases, but we have not entered them all | |
1817 | // in the copied_symbol_dynobjs_ map. | |
1818 | if (csym->has_alias()) | |
1819 | { | |
1820 | Symbol* sym = csym; | |
1821 | while (true) | |
1822 | { | |
1823 | sym = this->weak_aliases_[sym]; | |
1824 | if (sym == csym) | |
1825 | break; | |
1826 | gold_assert(sym->output_data() == posd); | |
1827 | ||
1828 | sym->set_is_copied_from_dynobj(); | |
1829 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
1830 | } | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
1835 | // the original definition was found. | |
1836 | ||
1837 | Dynobj* | |
1838 | Symbol_table::get_copy_source(const Symbol* sym) const | |
1839 | { | |
1840 | gold_assert(sym->is_copied_from_dynobj()); | |
1841 | Copied_symbol_dynobjs::const_iterator p = | |
1842 | this->copied_symbol_dynobjs_.find(sym); | |
1843 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
1844 | return p->second; | |
1845 | } | |
1846 | ||
f3e9c5c5 ILT |
1847 | // Add any undefined symbols named on the command line. |
1848 | ||
1849 | void | |
1850 | Symbol_table::add_undefined_symbols_from_command_line() | |
1851 | { | |
1852 | if (parameters->options().any_undefined()) | |
1853 | { | |
1854 | if (parameters->target().get_size() == 32) | |
1855 | { | |
5adf9721 | 1856 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
f3e9c5c5 ILT |
1857 | this->do_add_undefined_symbols_from_command_line<32>(); |
1858 | #else | |
1859 | gold_unreachable(); | |
1860 | #endif | |
1861 | } | |
1862 | else if (parameters->target().get_size() == 64) | |
1863 | { | |
1864 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1865 | this->do_add_undefined_symbols_from_command_line<64>(); | |
1866 | #else | |
1867 | gold_unreachable(); | |
1868 | #endif | |
1869 | } | |
1870 | else | |
1871 | gold_unreachable(); | |
1872 | } | |
1873 | } | |
1874 | ||
1875 | template<int size> | |
1876 | void | |
1877 | Symbol_table::do_add_undefined_symbols_from_command_line() | |
1878 | { | |
1879 | for (options::String_set::const_iterator p = | |
1880 | parameters->options().undefined_begin(); | |
1881 | p != parameters->options().undefined_end(); | |
1882 | ++p) | |
1883 | { | |
1884 | const char* name = p->c_str(); | |
1885 | ||
1886 | if (this->lookup(name) != NULL) | |
1887 | continue; | |
1888 | ||
1889 | const char* version = NULL; | |
1890 | ||
1891 | Sized_symbol<size>* sym; | |
1892 | Sized_symbol<size>* oldsym; | |
1893 | if (parameters->target().is_big_endian()) | |
1894 | { | |
1895 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1896 | sym = this->define_special_symbol<size, true>(&name, &version, | |
1897 | false, &oldsym); | |
1898 | #else | |
1899 | gold_unreachable(); | |
1900 | #endif | |
1901 | } | |
1902 | else | |
1903 | { | |
1904 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1905 | sym = this->define_special_symbol<size, false>(&name, &version, | |
1906 | false, &oldsym); | |
1907 | #else | |
1908 | gold_unreachable(); | |
1909 | #endif | |
1910 | } | |
1911 | ||
1912 | gold_assert(oldsym == NULL); | |
1913 | ||
75517b77 | 1914 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
f3e9c5c5 ILT |
1915 | elfcpp::STV_DEFAULT, 0); |
1916 | ++this->saw_undefined_; | |
1917 | } | |
1918 | } | |
1919 | ||
a3ad94ed ILT |
1920 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1921 | // global dynamic symbol. Pointers to the symbols are stored into the | |
1922 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
1923 | // updated dynamic symbol index. | |
1924 | ||
1925 | unsigned int | |
9b07f471 | 1926 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 1927 | std::vector<Symbol*>* syms, |
14b31740 ILT |
1928 | Stringpool* dynpool, |
1929 | Versions* versions) | |
a3ad94ed ILT |
1930 | { |
1931 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
1932 | p != this->table_.end(); | |
1933 | ++p) | |
1934 | { | |
1935 | Symbol* sym = p->second; | |
16649710 ILT |
1936 | |
1937 | // Note that SYM may already have a dynamic symbol index, since | |
1938 | // some symbols appear more than once in the symbol table, with | |
1939 | // and without a version. | |
1940 | ||
436ca963 | 1941 | if (!sym->should_add_dynsym_entry()) |
16649710 ILT |
1942 | sym->set_dynsym_index(-1U); |
1943 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1944 | { |
1945 | sym->set_dynsym_index(index); | |
1946 | ++index; | |
1947 | syms->push_back(sym); | |
cfd73a4e | 1948 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
1949 | |
1950 | // Record any version information. | |
09124467 ILT |
1951 | if (sym->version() != NULL) |
1952 | versions->record_version(this, dynpool, sym); | |
a3ad94ed ILT |
1953 | } |
1954 | } | |
1955 | ||
14b31740 ILT |
1956 | // Finish up the versions. In some cases this may add new dynamic |
1957 | // symbols. | |
9b07f471 | 1958 | index = versions->finalize(this, index, syms); |
14b31740 | 1959 | |
a3ad94ed ILT |
1960 | return index; |
1961 | } | |
1962 | ||
c06b7b0b | 1963 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
1964 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
1965 | // file offset OFF. Add their names to POOL. Return the new file | |
1966 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 1967 | |
75f65a3e | 1968 | off_t |
55a93433 ILT |
1969 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
1970 | size_t dyncount, Stringpool* pool, | |
1971 | unsigned int *plocal_symcount) | |
54dc6425 | 1972 | { |
f6ce93d6 ILT |
1973 | off_t ret; |
1974 | ||
55a93433 ILT |
1975 | gold_assert(*plocal_symcount != 0); |
1976 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 1977 | |
16649710 ILT |
1978 | this->dynamic_offset_ = dynoff; |
1979 | this->first_dynamic_global_index_ = dyn_global_index; | |
1980 | this->dynamic_count_ = dyncount; | |
1981 | ||
8851ecca | 1982 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
1983 | { |
1984 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 1985 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
1986 | #else |
1987 | gold_unreachable(); | |
1988 | #endif | |
1989 | } | |
8851ecca | 1990 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
1991 | { |
1992 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 1993 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
1994 | #else |
1995 | gold_unreachable(); | |
1996 | #endif | |
1997 | } | |
61ba1cf9 | 1998 | else |
a3ad94ed | 1999 | gold_unreachable(); |
f6ce93d6 ILT |
2000 | |
2001 | // Now that we have the final symbol table, we can reliably note | |
2002 | // which symbols should get warnings. | |
cb295612 | 2003 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2004 | |
2005 | return ret; | |
75f65a3e ILT |
2006 | } |
2007 | ||
55a93433 ILT |
2008 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2009 | // POOL, update *PINDEX and *POFF. | |
2010 | ||
2011 | template<int size> | |
2012 | void | |
2013 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2014 | unsigned int* pindex, off_t* poff) | |
2015 | { | |
2016 | sym->set_symtab_index(*pindex); | |
2017 | pool->add(sym->name(), false, NULL); | |
2018 | ++*pindex; | |
2019 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2020 | } | |
2021 | ||
ead1e424 ILT |
2022 | // Set the final value for all the symbols. This is called after |
2023 | // Layout::finalize, so all the output sections have their final | |
2024 | // address. | |
75f65a3e ILT |
2025 | |
2026 | template<int size> | |
2027 | off_t | |
55a93433 ILT |
2028 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2029 | unsigned int* plocal_symcount) | |
75f65a3e | 2030 | { |
ead1e424 | 2031 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2032 | this->offset_ = off; |
2033 | ||
55a93433 ILT |
2034 | unsigned int index = *plocal_symcount; |
2035 | const unsigned int orig_index = index; | |
c06b7b0b | 2036 | |
55a93433 ILT |
2037 | // First do all the symbols which have been forced to be local, as |
2038 | // they must appear before all global symbols. | |
2039 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2040 | p != this->forced_locals_.end(); | |
2041 | ++p) | |
2042 | { | |
2043 | Symbol* sym = *p; | |
2044 | gold_assert(sym->is_forced_local()); | |
2045 | if (this->sized_finalize_symbol<size>(sym)) | |
2046 | { | |
2047 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2048 | ++*plocal_symcount; | |
2049 | } | |
2050 | } | |
2051 | ||
2052 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2053 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2054 | p != this->table_.end(); | |
2055 | ++p) | |
54dc6425 | 2056 | { |
55a93433 ILT |
2057 | Symbol* sym = p->second; |
2058 | if (this->sized_finalize_symbol<size>(sym)) | |
2059 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2060 | } | |
54dc6425 | 2061 | |
55a93433 | 2062 | this->output_count_ = index - orig_index; |
a3ad94ed | 2063 | |
55a93433 ILT |
2064 | return off; |
2065 | } | |
75f65a3e | 2066 | |
55a93433 ILT |
2067 | // Finalize the symbol SYM. This returns true if the symbol should be |
2068 | // added to the symbol table, false otherwise. | |
008db82e | 2069 | |
55a93433 ILT |
2070 | template<int size> |
2071 | bool | |
2072 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2073 | { | |
ef9beddf ILT |
2074 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2075 | ||
55a93433 | 2076 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); |
75f65a3e | 2077 | |
55a93433 ILT |
2078 | // The default version of a symbol may appear twice in the symbol |
2079 | // table. We only need to finalize it once. | |
2080 | if (sym->has_symtab_index()) | |
2081 | return false; | |
ead1e424 | 2082 | |
55a93433 ILT |
2083 | if (!sym->in_reg()) |
2084 | { | |
2085 | gold_assert(!sym->has_symtab_index()); | |
2086 | sym->set_symtab_index(-1U); | |
2087 | gold_assert(sym->dynsym_index() == -1U); | |
2088 | return false; | |
2089 | } | |
ead1e424 | 2090 | |
ef9beddf | 2091 | Value_type value; |
ead1e424 | 2092 | |
55a93433 ILT |
2093 | switch (sym->source()) |
2094 | { | |
2095 | case Symbol::FROM_OBJECT: | |
2096 | { | |
d491d34e ILT |
2097 | bool is_ordinary; |
2098 | unsigned int shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2099 | |
55a93433 | 2100 | // FIXME: We need some target specific support here. |
d491d34e | 2101 | if (!is_ordinary |
0dfbdef4 ILT |
2102 | && shndx != elfcpp::SHN_ABS |
2103 | && shndx != elfcpp::SHN_COMMON) | |
55a93433 ILT |
2104 | { |
2105 | gold_error(_("%s: unsupported symbol section 0x%x"), | |
2106 | sym->demangled_name().c_str(), shndx); | |
2107 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2108 | } |
ead1e424 | 2109 | |
55a93433 ILT |
2110 | Object* symobj = sym->object(); |
2111 | if (symobj->is_dynamic()) | |
ead1e424 | 2112 | { |
55a93433 ILT |
2113 | value = 0; |
2114 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2115 | } |
89fc3421 CC |
2116 | else if (symobj->pluginobj() != NULL) |
2117 | { | |
2118 | value = 0; | |
2119 | shndx = elfcpp::SHN_UNDEF; | |
2120 | } | |
55a93433 ILT |
2121 | else if (shndx == elfcpp::SHN_UNDEF) |
2122 | value = 0; | |
d491d34e ILT |
2123 | else if (!is_ordinary |
2124 | && (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON)) | |
55a93433 ILT |
2125 | value = sym->value(); |
2126 | else | |
ead1e424 | 2127 | { |
55a93433 | 2128 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ef9beddf | 2129 | Output_section* os = relobj->output_section(shndx); |
55a93433 ILT |
2130 | |
2131 | if (os == NULL) | |
ead1e424 | 2132 | { |
55a93433 ILT |
2133 | sym->set_symtab_index(-1U); |
2134 | gold_assert(sym->dynsym_index() == -1U); | |
2135 | return false; | |
ead1e424 | 2136 | } |
55a93433 | 2137 | |
ef9beddf | 2138 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
eff45813 CC |
2139 | if (secoff64 == -1ULL) |
2140 | { | |
2141 | // The section needs special handling (e.g., a merge section). | |
2142 | value = os->output_address(relobj, shndx, sym->value()); | |
2143 | } | |
2144 | else | |
2145 | { | |
2146 | Value_type secoff = | |
2147 | convert_types<Value_type, uint64_t>(secoff64); | |
2148 | if (sym->type() == elfcpp::STT_TLS) | |
2149 | value = sym->value() + os->tls_offset() + secoff; | |
2150 | else | |
2151 | value = sym->value() + os->address() + secoff; | |
2152 | } | |
ead1e424 | 2153 | } |
55a93433 ILT |
2154 | } |
2155 | break; | |
2156 | ||
2157 | case Symbol::IN_OUTPUT_DATA: | |
2158 | { | |
2159 | Output_data* od = sym->output_data(); | |
155a0dd7 ILT |
2160 | value = sym->value(); |
2161 | if (sym->type() != elfcpp::STT_TLS) | |
2162 | value += od->address(); | |
2163 | else | |
2164 | { | |
2165 | Output_section* os = od->output_section(); | |
2166 | gold_assert(os != NULL); | |
2167 | value += os->tls_offset() + (od->address() - os->address()); | |
2168 | } | |
55a93433 ILT |
2169 | if (sym->offset_is_from_end()) |
2170 | value += od->data_size(); | |
2171 | } | |
2172 | break; | |
2173 | ||
2174 | case Symbol::IN_OUTPUT_SEGMENT: | |
2175 | { | |
2176 | Output_segment* os = sym->output_segment(); | |
edfbb029 CC |
2177 | value = sym->value(); |
2178 | if (sym->type() != elfcpp::STT_TLS) | |
2179 | value += os->vaddr(); | |
55a93433 ILT |
2180 | switch (sym->offset_base()) |
2181 | { | |
2182 | case Symbol::SEGMENT_START: | |
2183 | break; | |
2184 | case Symbol::SEGMENT_END: | |
2185 | value += os->memsz(); | |
2186 | break; | |
2187 | case Symbol::SEGMENT_BSS: | |
2188 | value += os->filesz(); | |
2189 | break; | |
2190 | default: | |
2191 | gold_unreachable(); | |
2192 | } | |
2193 | } | |
2194 | break; | |
ead1e424 | 2195 | |
f3e9c5c5 | 2196 | case Symbol::IS_CONSTANT: |
55a93433 ILT |
2197 | value = sym->value(); |
2198 | break; | |
ead1e424 | 2199 | |
f3e9c5c5 ILT |
2200 | case Symbol::IS_UNDEFINED: |
2201 | value = 0; | |
2202 | break; | |
2203 | ||
55a93433 ILT |
2204 | default: |
2205 | gold_unreachable(); | |
2206 | } | |
ead1e424 | 2207 | |
55a93433 | 2208 | sym->set_value(value); |
9e2dcb77 | 2209 | |
8851ecca | 2210 | if (parameters->options().strip_all()) |
55a93433 ILT |
2211 | { |
2212 | sym->set_symtab_index(-1U); | |
2213 | return false; | |
54dc6425 | 2214 | } |
75f65a3e | 2215 | |
55a93433 | 2216 | return true; |
54dc6425 ILT |
2217 | } |
2218 | ||
61ba1cf9 ILT |
2219 | // Write out the global symbols. |
2220 | ||
2221 | void | |
9a2d6984 ILT |
2222 | Symbol_table::write_globals(const Input_objects* input_objects, |
2223 | const Stringpool* sympool, | |
d491d34e ILT |
2224 | const Stringpool* dynpool, |
2225 | Output_symtab_xindex* symtab_xindex, | |
2226 | Output_symtab_xindex* dynsym_xindex, | |
2227 | Output_file* of) const | |
61ba1cf9 | 2228 | { |
8851ecca | 2229 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2230 | { |
9025d29d | 2231 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca ILT |
2232 | case Parameters::TARGET_32_LITTLE: |
2233 | this->sized_write_globals<32, false>(input_objects, sympool, | |
d491d34e ILT |
2234 | dynpool, symtab_xindex, |
2235 | dynsym_xindex, of); | |
8851ecca | 2236 | break; |
9025d29d | 2237 | #endif |
8851ecca ILT |
2238 | #ifdef HAVE_TARGET_32_BIG |
2239 | case Parameters::TARGET_32_BIG: | |
2240 | this->sized_write_globals<32, true>(input_objects, sympool, | |
d491d34e ILT |
2241 | dynpool, symtab_xindex, |
2242 | dynsym_xindex, of); | |
8851ecca | 2243 | break; |
9025d29d | 2244 | #endif |
9025d29d | 2245 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca ILT |
2246 | case Parameters::TARGET_64_LITTLE: |
2247 | this->sized_write_globals<64, false>(input_objects, sympool, | |
d491d34e ILT |
2248 | dynpool, symtab_xindex, |
2249 | dynsym_xindex, of); | |
8851ecca | 2250 | break; |
9025d29d | 2251 | #endif |
8851ecca ILT |
2252 | #ifdef HAVE_TARGET_64_BIG |
2253 | case Parameters::TARGET_64_BIG: | |
2254 | this->sized_write_globals<64, true>(input_objects, sympool, | |
d491d34e ILT |
2255 | dynpool, symtab_xindex, |
2256 | dynsym_xindex, of); | |
8851ecca ILT |
2257 | break; |
2258 | #endif | |
2259 | default: | |
2260 | gold_unreachable(); | |
61ba1cf9 | 2261 | } |
61ba1cf9 ILT |
2262 | } |
2263 | ||
2264 | // Write out the global symbols. | |
2265 | ||
2266 | template<int size, bool big_endian> | |
2267 | void | |
9a2d6984 | 2268 | Symbol_table::sized_write_globals(const Input_objects* input_objects, |
61ba1cf9 | 2269 | const Stringpool* sympool, |
16649710 | 2270 | const Stringpool* dynpool, |
d491d34e ILT |
2271 | Output_symtab_xindex* symtab_xindex, |
2272 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2273 | Output_file* of) const |
2274 | { | |
8851ecca | 2275 | const Target& target = parameters->target(); |
9a2d6984 | 2276 | |
61ba1cf9 | 2277 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2278 | |
2279 | const unsigned int output_count = this->output_count_; | |
2280 | const section_size_type oview_size = output_count * sym_size; | |
2281 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2282 | unsigned char* psyms; |
2283 | if (this->offset_ == 0 || output_count == 0) | |
2284 | psyms = NULL; | |
2285 | else | |
2286 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2287 | |
55a93433 ILT |
2288 | const unsigned int dynamic_count = this->dynamic_count_; |
2289 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2290 | const unsigned int first_dynamic_global_index = | |
2291 | this->first_dynamic_global_index_; | |
16649710 | 2292 | unsigned char* dynamic_view; |
5fe2a0f5 | 2293 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2294 | dynamic_view = NULL; |
2295 | else | |
2296 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2297 | |
61ba1cf9 ILT |
2298 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2299 | p != this->table_.end(); | |
2300 | ++p) | |
2301 | { | |
2302 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2303 | ||
9a2d6984 ILT |
2304 | // Possibly warn about unresolved symbols in shared libraries. |
2305 | this->warn_about_undefined_dynobj_symbol(input_objects, sym); | |
e2827e5f | 2306 | |
a3ad94ed | 2307 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2308 | unsigned int dynsym_index; |
2309 | if (dynamic_view == NULL) | |
2310 | dynsym_index = -1U; | |
2311 | else | |
2312 | dynsym_index = sym->dynsym_index(); | |
2313 | ||
2314 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2315 | { |
2316 | // This symbol is not included in the output file. | |
2317 | continue; | |
2318 | } | |
16649710 | 2319 | |
ead1e424 | 2320 | unsigned int shndx; |
88dd47ac ILT |
2321 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2322 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ead1e424 ILT |
2323 | switch (sym->source()) |
2324 | { | |
2325 | case Symbol::FROM_OBJECT: | |
2326 | { | |
d491d34e ILT |
2327 | bool is_ordinary; |
2328 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 ILT |
2329 | |
2330 | // FIXME: We need some target specific support here. | |
d491d34e | 2331 | if (!is_ordinary |
0dfbdef4 ILT |
2332 | && in_shndx != elfcpp::SHN_ABS |
2333 | && in_shndx != elfcpp::SHN_COMMON) | |
ead1e424 | 2334 | { |
75f2446e | 2335 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2336 | sym->demangled_name().c_str(), in_shndx); |
75f2446e | 2337 | shndx = in_shndx; |
f6ce93d6 | 2338 | } |
ead1e424 ILT |
2339 | else |
2340 | { | |
75f2446e ILT |
2341 | Object* symobj = sym->object(); |
2342 | if (symobj->is_dynamic()) | |
2343 | { | |
2344 | if (sym->needs_dynsym_value()) | |
8851ecca | 2345 | dynsym_value = target.dynsym_value(sym); |
75f2446e ILT |
2346 | shndx = elfcpp::SHN_UNDEF; |
2347 | } | |
89fc3421 CC |
2348 | else if (symobj->pluginobj() != NULL) |
2349 | shndx = elfcpp::SHN_UNDEF; | |
75f2446e | 2350 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
2351 | || (!is_ordinary |
2352 | && (in_shndx == elfcpp::SHN_ABS | |
2353 | || in_shndx == elfcpp::SHN_COMMON))) | |
75f2446e ILT |
2354 | shndx = in_shndx; |
2355 | else | |
2356 | { | |
2357 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 2358 | Output_section* os = relobj->output_section(in_shndx); |
75f2446e ILT |
2359 | gold_assert(os != NULL); |
2360 | shndx = os->out_shndx(); | |
88dd47ac | 2361 | |
d491d34e ILT |
2362 | if (shndx >= elfcpp::SHN_LORESERVE) |
2363 | { | |
2364 | if (sym_index != -1U) | |
2365 | symtab_xindex->add(sym_index, shndx); | |
2366 | if (dynsym_index != -1U) | |
2367 | dynsym_xindex->add(dynsym_index, shndx); | |
2368 | shndx = elfcpp::SHN_XINDEX; | |
2369 | } | |
2370 | ||
88dd47ac ILT |
2371 | // In object files symbol values are section |
2372 | // relative. | |
8851ecca | 2373 | if (parameters->options().relocatable()) |
88dd47ac | 2374 | sym_value -= os->address(); |
75f2446e | 2375 | } |
ead1e424 ILT |
2376 | } |
2377 | } | |
2378 | break; | |
2379 | ||
2380 | case Symbol::IN_OUTPUT_DATA: | |
2381 | shndx = sym->output_data()->out_shndx(); | |
d491d34e ILT |
2382 | if (shndx >= elfcpp::SHN_LORESERVE) |
2383 | { | |
2384 | if (sym_index != -1U) | |
2385 | symtab_xindex->add(sym_index, shndx); | |
2386 | if (dynsym_index != -1U) | |
2387 | dynsym_xindex->add(dynsym_index, shndx); | |
2388 | shndx = elfcpp::SHN_XINDEX; | |
2389 | } | |
ead1e424 ILT |
2390 | break; |
2391 | ||
2392 | case Symbol::IN_OUTPUT_SEGMENT: | |
2393 | shndx = elfcpp::SHN_ABS; | |
2394 | break; | |
2395 | ||
f3e9c5c5 | 2396 | case Symbol::IS_CONSTANT: |
ead1e424 ILT |
2397 | shndx = elfcpp::SHN_ABS; |
2398 | break; | |
2399 | ||
f3e9c5c5 ILT |
2400 | case Symbol::IS_UNDEFINED: |
2401 | shndx = elfcpp::SHN_UNDEF; | |
2402 | break; | |
2403 | ||
ead1e424 | 2404 | default: |
a3ad94ed | 2405 | gold_unreachable(); |
ead1e424 | 2406 | } |
61ba1cf9 | 2407 | |
16649710 ILT |
2408 | if (sym_index != -1U) |
2409 | { | |
55a93433 ILT |
2410 | sym_index -= first_global_index; |
2411 | gold_assert(sym_index < output_count); | |
2412 | unsigned char* ps = psyms + (sym_index * sym_size); | |
7d1a9ebb ILT |
2413 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
2414 | sympool, ps); | |
16649710 | 2415 | } |
61ba1cf9 | 2416 | |
16649710 ILT |
2417 | if (dynsym_index != -1U) |
2418 | { | |
2419 | dynsym_index -= first_dynamic_global_index; | |
2420 | gold_assert(dynsym_index < dynamic_count); | |
2421 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
7d1a9ebb ILT |
2422 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
2423 | dynpool, pd); | |
16649710 | 2424 | } |
61ba1cf9 ILT |
2425 | } |
2426 | ||
c06b7b0b | 2427 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
2428 | if (dynamic_view != NULL) |
2429 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
2430 | } | |
2431 | ||
2432 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
2433 | // strtab holding the name. | |
2434 | ||
2435 | template<int size, bool big_endian> | |
2436 | void | |
ab5c9e90 ILT |
2437 | Symbol_table::sized_write_symbol( |
2438 | Sized_symbol<size>* sym, | |
2439 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2440 | unsigned int shndx, | |
2441 | const Stringpool* pool, | |
7d1a9ebb | 2442 | unsigned char* p) const |
16649710 ILT |
2443 | { |
2444 | elfcpp::Sym_write<size, big_endian> osym(p); | |
2445 | osym.put_st_name(pool->get_offset(sym->name())); | |
ab5c9e90 | 2446 | osym.put_st_value(value); |
58e54ac2 CD |
2447 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2448 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) | |
2449 | osym.put_st_size(0); | |
2450 | else | |
2451 | osym.put_st_size(sym->symsize()); | |
55a93433 ILT |
2452 | // A version script may have overridden the default binding. |
2453 | if (sym->is_forced_local()) | |
2454 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type())); | |
2455 | else | |
2456 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
16649710 ILT |
2457 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2458 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
2459 | } |
2460 | ||
9a2d6984 ILT |
2461 | // Check for unresolved symbols in shared libraries. This is |
2462 | // controlled by the --allow-shlib-undefined option. | |
2463 | ||
2464 | // We only warn about libraries for which we have seen all the | |
2465 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2466 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2467 | // entry, we aren't going to be able to reliably report whether the | |
2468 | // symbol is undefined. | |
2469 | ||
2470 | // We also don't warn about libraries found in the system library | |
2471 | // directory (the directory were we find libc.so); we assume that | |
2472 | // those libraries are OK. This heuristic avoids problems in | |
2473 | // GNU/Linux, in which -ldl can have undefined references satisfied by | |
2474 | // ld-linux.so. | |
2475 | ||
2476 | inline void | |
2477 | Symbol_table::warn_about_undefined_dynobj_symbol( | |
2478 | const Input_objects* input_objects, | |
2479 | Symbol* sym) const | |
2480 | { | |
d491d34e | 2481 | bool dummy; |
9a2d6984 ILT |
2482 | if (sym->source() == Symbol::FROM_OBJECT |
2483 | && sym->object()->is_dynamic() | |
d491d34e | 2484 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 2485 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
2486 | && !parameters->options().allow_shlib_undefined() |
2487 | && !parameters->target().is_defined_by_abi(sym) | |
9a2d6984 ILT |
2488 | && !input_objects->found_in_system_library_directory(sym->object())) |
2489 | { | |
2490 | // A very ugly cast. | |
2491 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2492 | if (!dynobj->has_unknown_needed_entries()) | |
096b02cf CS |
2493 | { |
2494 | if (sym->version()) | |
2495 | gold_error(_("%s: undefined reference to '%s', version '%s'"), | |
2496 | sym->object()->name().c_str(), | |
2497 | sym->demangled_name().c_str(), | |
2498 | sym->version()); | |
2499 | else | |
2500 | gold_error(_("%s: undefined reference to '%s'"), | |
2501 | sym->object()->name().c_str(), | |
2502 | sym->demangled_name().c_str()); | |
2503 | } | |
9a2d6984 ILT |
2504 | } |
2505 | } | |
2506 | ||
a3ad94ed ILT |
2507 | // Write out a section symbol. Return the update offset. |
2508 | ||
2509 | void | |
9025d29d | 2510 | Symbol_table::write_section_symbol(const Output_section *os, |
d491d34e | 2511 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2512 | Output_file* of, |
2513 | off_t offset) const | |
2514 | { | |
8851ecca | 2515 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2516 | { |
9025d29d | 2517 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2518 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
2519 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
2520 | offset); | |
8851ecca | 2521 | break; |
9025d29d | 2522 | #endif |
8851ecca ILT |
2523 | #ifdef HAVE_TARGET_32_BIG |
2524 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
2525 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
2526 | offset); | |
8851ecca | 2527 | break; |
9025d29d | 2528 | #endif |
9025d29d | 2529 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2530 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
2531 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
2532 | offset); | |
8851ecca | 2533 | break; |
9025d29d | 2534 | #endif |
8851ecca ILT |
2535 | #ifdef HAVE_TARGET_64_BIG |
2536 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
2537 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
2538 | offset); | |
8851ecca ILT |
2539 | break; |
2540 | #endif | |
2541 | default: | |
2542 | gold_unreachable(); | |
a3ad94ed | 2543 | } |
a3ad94ed ILT |
2544 | } |
2545 | ||
2546 | // Write out a section symbol, specialized for size and endianness. | |
2547 | ||
2548 | template<int size, bool big_endian> | |
2549 | void | |
2550 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 2551 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2552 | Output_file* of, |
2553 | off_t offset) const | |
2554 | { | |
2555 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2556 | ||
2557 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2558 | ||
2559 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2560 | osym.put_st_name(0); | |
2561 | osym.put_st_value(os->address()); | |
2562 | osym.put_st_size(0); | |
2563 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2564 | elfcpp::STT_SECTION)); | |
2565 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e ILT |
2566 | |
2567 | unsigned int shndx = os->out_shndx(); | |
2568 | if (shndx >= elfcpp::SHN_LORESERVE) | |
2569 | { | |
2570 | symtab_xindex->add(os->symtab_index(), shndx); | |
2571 | shndx = elfcpp::SHN_XINDEX; | |
2572 | } | |
2573 | osym.put_st_shndx(shndx); | |
a3ad94ed ILT |
2574 | |
2575 | of->write_output_view(offset, sym_size, pov); | |
2576 | } | |
2577 | ||
abaa3995 ILT |
2578 | // Print statistical information to stderr. This is used for --stats. |
2579 | ||
2580 | void | |
2581 | Symbol_table::print_stats() const | |
2582 | { | |
2583 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2584 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2585 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2586 | #else | |
2587 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2588 | program_name, this->table_.size()); | |
2589 | #endif | |
ad8f37d1 | 2590 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2591 | } |
2592 | ||
ff541f30 ILT |
2593 | // We check for ODR violations by looking for symbols with the same |
2594 | // name for which the debugging information reports that they were | |
2595 | // defined in different source locations. When comparing the source | |
2596 | // location, we consider instances with the same base filename and | |
2597 | // line number to be the same. This is because different object | |
2598 | // files/shared libraries can include the same header file using | |
2599 | // different paths, and we don't want to report an ODR violation in | |
2600 | // that case. | |
2601 | ||
2602 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2603 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2604 | // operator used with std::set. |
2605 | ||
2606 | struct Odr_violation_compare | |
2607 | { | |
2608 | bool | |
2609 | operator()(const std::string& s1, const std::string& s2) const | |
2610 | { | |
2611 | std::string::size_type pos1 = s1.rfind('/'); | |
2612 | std::string::size_type pos2 = s2.rfind('/'); | |
2613 | if (pos1 == std::string::npos | |
2614 | || pos2 == std::string::npos) | |
2615 | return s1 < s2; | |
2616 | return s1.compare(pos1, std::string::npos, | |
2617 | s2, pos2, std::string::npos) < 0; | |
2618 | } | |
2619 | }; | |
2620 | ||
70e654ba ILT |
2621 | // Check candidate_odr_violations_ to find symbols with the same name |
2622 | // but apparently different definitions (different source-file/line-no). | |
2623 | ||
2624 | void | |
17a1d0a9 ILT |
2625 | Symbol_table::detect_odr_violations(const Task* task, |
2626 | const char* output_file_name) const | |
70e654ba ILT |
2627 | { |
2628 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
2629 | it != candidate_odr_violations_.end(); | |
2630 | ++it) | |
2631 | { | |
2632 | const char* symbol_name = it->first; | |
2633 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 2634 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 2635 | |
b01c0a4a ILT |
2636 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
2637 | locs = it->second.begin(); | |
2638 | locs != it->second.end(); | |
2639 | ++locs) | |
70e654ba ILT |
2640 | { |
2641 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
2642 | // means that we have to run in a singleton Task. If we |
2643 | // want to run this in a general Task for better | |
2644 | // performance, we will need one Task for object, plus | |
2645 | // appropriate locking to ensure that we don't conflict with | |
e4e5049b CS |
2646 | // other uses of the object. Also note, one_addr2line is not |
2647 | // currently thread-safe. | |
17a1d0a9 | 2648 | Task_lock_obj<Object> tl(task, locs->object); |
e4e5049b | 2649 | // 16 is the size of the object-cache that one_addr2line should use. |
a55ce7fe | 2650 | std::string lineno = Dwarf_line_info::one_addr2line( |
e4e5049b | 2651 | locs->object, locs->shndx, locs->offset, 16); |
70e654ba ILT |
2652 | if (!lineno.empty()) |
2653 | line_nums.insert(lineno); | |
2654 | } | |
2655 | ||
2656 | if (line_nums.size() > 1) | |
2657 | { | |
dd8670e5 | 2658 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 2659 | "places (possible ODR violation):"), |
a2b1aa12 | 2660 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
2661 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
2662 | it2 != line_nums.end(); | |
2663 | ++it2) | |
2664 | fprintf(stderr, " %s\n", it2->c_str()); | |
2665 | } | |
2666 | } | |
e4e5049b CS |
2667 | // We only call one_addr2line() in this function, so we can clear its cache. |
2668 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
2669 | } |
2670 | ||
f6ce93d6 ILT |
2671 | // Warnings functions. |
2672 | ||
2673 | // Add a new warning. | |
2674 | ||
2675 | void | |
2676 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 2677 | const std::string& warning) |
f6ce93d6 ILT |
2678 | { |
2679 | name = symtab->canonicalize_name(name); | |
cb295612 | 2680 | this->warnings_[name].set(obj, warning); |
f6ce93d6 ILT |
2681 | } |
2682 | ||
2683 | // Look through the warnings and mark the symbols for which we should | |
2684 | // warn. This is called during Layout::finalize when we know the | |
2685 | // sources for all the symbols. | |
2686 | ||
2687 | void | |
cb295612 | 2688 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
2689 | { |
2690 | for (Warning_table::iterator p = this->warnings_.begin(); | |
2691 | p != this->warnings_.end(); | |
2692 | ++p) | |
2693 | { | |
2694 | Symbol* sym = symtab->lookup(p->first, NULL); | |
2695 | if (sym != NULL | |
2696 | && sym->source() == Symbol::FROM_OBJECT | |
2697 | && sym->object() == p->second.object) | |
cb295612 | 2698 | sym->set_has_warning(); |
f6ce93d6 ILT |
2699 | } |
2700 | } | |
2701 | ||
2702 | // Issue a warning. This is called when we see a relocation against a | |
2703 | // symbol for which has a warning. | |
2704 | ||
75f2446e | 2705 | template<int size, bool big_endian> |
f6ce93d6 | 2706 | void |
75f2446e ILT |
2707 | Warnings::issue_warning(const Symbol* sym, |
2708 | const Relocate_info<size, big_endian>* relinfo, | |
2709 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 2710 | { |
a3ad94ed | 2711 | gold_assert(sym->has_warning()); |
f6ce93d6 | 2712 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 2713 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
2714 | gold_warning_at_location(relinfo, relnum, reloffset, |
2715 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
2716 | } |
2717 | ||
14bfc3f5 ILT |
2718 | // Instantiate the templates we need. We could use the configure |
2719 | // script to restrict this to only the ones needed for implemented | |
2720 | // targets. | |
2721 | ||
c7912668 ILT |
2722 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2723 | template | |
2724 | void | |
2725 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
2726 | #endif | |
2727 | ||
2728 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2729 | template | |
2730 | void | |
2731 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
2732 | #endif | |
2733 | ||
193a53d9 | 2734 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
2735 | template |
2736 | void | |
193a53d9 ILT |
2737 | Symbol_table::add_from_relobj<32, false>( |
2738 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 2739 | const unsigned char* syms, |
14bfc3f5 | 2740 | size_t count, |
d491d34e | 2741 | size_t symndx_offset, |
14bfc3f5 ILT |
2742 | const char* sym_names, |
2743 | size_t sym_name_size, | |
ae6dce4d | 2744 | Sized_relobj<32, false>::Symbols* sympointers, |
92de84a6 | 2745 | size_t* defined); |
193a53d9 | 2746 | #endif |
14bfc3f5 | 2747 | |
193a53d9 | 2748 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
2749 | template |
2750 | void | |
193a53d9 ILT |
2751 | Symbol_table::add_from_relobj<32, true>( |
2752 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 2753 | const unsigned char* syms, |
14bfc3f5 | 2754 | size_t count, |
d491d34e | 2755 | size_t symndx_offset, |
14bfc3f5 ILT |
2756 | const char* sym_names, |
2757 | size_t sym_name_size, | |
ae6dce4d | 2758 | Sized_relobj<32, true>::Symbols* sympointers, |
92de84a6 | 2759 | size_t* defined); |
193a53d9 | 2760 | #endif |
14bfc3f5 | 2761 | |
193a53d9 | 2762 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
2763 | template |
2764 | void | |
193a53d9 ILT |
2765 | Symbol_table::add_from_relobj<64, false>( |
2766 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 2767 | const unsigned char* syms, |
14bfc3f5 | 2768 | size_t count, |
d491d34e | 2769 | size_t symndx_offset, |
14bfc3f5 ILT |
2770 | const char* sym_names, |
2771 | size_t sym_name_size, | |
ae6dce4d | 2772 | Sized_relobj<64, false>::Symbols* sympointers, |
92de84a6 | 2773 | size_t* defined); |
193a53d9 | 2774 | #endif |
14bfc3f5 | 2775 | |
193a53d9 | 2776 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
2777 | template |
2778 | void | |
193a53d9 ILT |
2779 | Symbol_table::add_from_relobj<64, true>( |
2780 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 2781 | const unsigned char* syms, |
14bfc3f5 | 2782 | size_t count, |
d491d34e | 2783 | size_t symndx_offset, |
14bfc3f5 ILT |
2784 | const char* sym_names, |
2785 | size_t sym_name_size, | |
ae6dce4d | 2786 | Sized_relobj<64, true>::Symbols* sympointers, |
92de84a6 | 2787 | size_t* defined); |
193a53d9 | 2788 | #endif |
14bfc3f5 | 2789 | |
89fc3421 CC |
2790 | #ifdef HAVE_TARGET_32_LITTLE |
2791 | template | |
2792 | Symbol* | |
2793 | Symbol_table::add_from_pluginobj<32, false>( | |
2794 | Sized_pluginobj<32, false>* obj, | |
2795 | const char* name, | |
2796 | const char* ver, | |
2797 | elfcpp::Sym<32, false>* sym); | |
2798 | #endif | |
2799 | ||
2800 | #ifdef HAVE_TARGET_32_BIG | |
2801 | template | |
2802 | Symbol* | |
2803 | Symbol_table::add_from_pluginobj<32, true>( | |
2804 | Sized_pluginobj<32, true>* obj, | |
2805 | const char* name, | |
2806 | const char* ver, | |
2807 | elfcpp::Sym<32, true>* sym); | |
2808 | #endif | |
2809 | ||
2810 | #ifdef HAVE_TARGET_64_LITTLE | |
2811 | template | |
2812 | Symbol* | |
2813 | Symbol_table::add_from_pluginobj<64, false>( | |
2814 | Sized_pluginobj<64, false>* obj, | |
2815 | const char* name, | |
2816 | const char* ver, | |
2817 | elfcpp::Sym<64, false>* sym); | |
2818 | #endif | |
2819 | ||
2820 | #ifdef HAVE_TARGET_64_BIG | |
2821 | template | |
2822 | Symbol* | |
2823 | Symbol_table::add_from_pluginobj<64, true>( | |
2824 | Sized_pluginobj<64, true>* obj, | |
2825 | const char* name, | |
2826 | const char* ver, | |
2827 | elfcpp::Sym<64, true>* sym); | |
2828 | #endif | |
2829 | ||
193a53d9 | 2830 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
2831 | template |
2832 | void | |
193a53d9 ILT |
2833 | Symbol_table::add_from_dynobj<32, false>( |
2834 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
2835 | const unsigned char* syms, |
2836 | size_t count, | |
2837 | const char* sym_names, | |
2838 | size_t sym_name_size, | |
2839 | const unsigned char* versym, | |
2840 | size_t versym_size, | |
92de84a6 ILT |
2841 | const std::vector<const char*>* version_map, |
2842 | Sized_relobj<32, false>::Symbols* sympointers, | |
2843 | size_t* defined); | |
193a53d9 | 2844 | #endif |
dbe717ef | 2845 | |
193a53d9 | 2846 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
2847 | template |
2848 | void | |
193a53d9 ILT |
2849 | Symbol_table::add_from_dynobj<32, true>( |
2850 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
2851 | const unsigned char* syms, |
2852 | size_t count, | |
2853 | const char* sym_names, | |
2854 | size_t sym_name_size, | |
2855 | const unsigned char* versym, | |
2856 | size_t versym_size, | |
92de84a6 ILT |
2857 | const std::vector<const char*>* version_map, |
2858 | Sized_relobj<32, true>::Symbols* sympointers, | |
2859 | size_t* defined); | |
193a53d9 | 2860 | #endif |
dbe717ef | 2861 | |
193a53d9 | 2862 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
2863 | template |
2864 | void | |
193a53d9 ILT |
2865 | Symbol_table::add_from_dynobj<64, false>( |
2866 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
2867 | const unsigned char* syms, |
2868 | size_t count, | |
2869 | const char* sym_names, | |
2870 | size_t sym_name_size, | |
2871 | const unsigned char* versym, | |
2872 | size_t versym_size, | |
92de84a6 ILT |
2873 | const std::vector<const char*>* version_map, |
2874 | Sized_relobj<64, false>::Symbols* sympointers, | |
2875 | size_t* defined); | |
193a53d9 | 2876 | #endif |
dbe717ef | 2877 | |
193a53d9 | 2878 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
2879 | template |
2880 | void | |
193a53d9 ILT |
2881 | Symbol_table::add_from_dynobj<64, true>( |
2882 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
2883 | const unsigned char* syms, |
2884 | size_t count, | |
2885 | const char* sym_names, | |
2886 | size_t sym_name_size, | |
2887 | const unsigned char* versym, | |
2888 | size_t versym_size, | |
92de84a6 ILT |
2889 | const std::vector<const char*>* version_map, |
2890 | Sized_relobj<64, true>::Symbols* sympointers, | |
2891 | size_t* defined); | |
193a53d9 | 2892 | #endif |
dbe717ef | 2893 | |
46fe1623 ILT |
2894 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2895 | template | |
2896 | void | |
fe8718a4 | 2897 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
2898 | Sized_symbol<32>* sym, |
2899 | Output_data* posd, | |
2900 | elfcpp::Elf_types<32>::Elf_Addr value); | |
46fe1623 ILT |
2901 | #endif |
2902 | ||
2903 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2904 | template | |
2905 | void | |
fe8718a4 | 2906 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
2907 | Sized_symbol<64>* sym, |
2908 | Output_data* posd, | |
2909 | elfcpp::Elf_types<64>::Elf_Addr value); | |
46fe1623 ILT |
2910 | #endif |
2911 | ||
75f2446e ILT |
2912 | #ifdef HAVE_TARGET_32_LITTLE |
2913 | template | |
2914 | void | |
2915 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
2916 | const Relocate_info<32, false>* relinfo, | |
2917 | size_t relnum, off_t reloffset) const; | |
2918 | #endif | |
2919 | ||
2920 | #ifdef HAVE_TARGET_32_BIG | |
2921 | template | |
2922 | void | |
2923 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
2924 | const Relocate_info<32, true>* relinfo, | |
2925 | size_t relnum, off_t reloffset) const; | |
2926 | #endif | |
2927 | ||
2928 | #ifdef HAVE_TARGET_64_LITTLE | |
2929 | template | |
2930 | void | |
2931 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
2932 | const Relocate_info<64, false>* relinfo, | |
2933 | size_t relnum, off_t reloffset) const; | |
2934 | #endif | |
2935 | ||
2936 | #ifdef HAVE_TARGET_64_BIG | |
2937 | template | |
2938 | void | |
2939 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
2940 | const Relocate_info<64, true>* relinfo, | |
2941 | size_t relnum, off_t reloffset) const; | |
2942 | #endif | |
2943 | ||
14bfc3f5 | 2944 | } // End namespace gold. |