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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" |
c82fbeee | 40 | #include "demangle.h" // needed for --dynamic-list-cpp-new |
89fc3421 | 41 | #include "plugin.h" |
14bfc3f5 ILT |
42 | |
43 | namespace gold | |
44 | { | |
45 | ||
46 | // Class Symbol. | |
47 | ||
ead1e424 ILT |
48 | // Initialize fields in Symbol. This initializes everything except u_ |
49 | // and source_. | |
14bfc3f5 | 50 | |
14bfc3f5 | 51 | void |
ead1e424 ILT |
52 | Symbol::init_fields(const char* name, const char* version, |
53 | elfcpp::STT type, elfcpp::STB binding, | |
54 | elfcpp::STV visibility, unsigned char nonvis) | |
14bfc3f5 ILT |
55 | { |
56 | this->name_ = name; | |
57 | this->version_ = version; | |
c06b7b0b ILT |
58 | this->symtab_index_ = 0; |
59 | this->dynsym_index_ = 0; | |
0a65a3a7 | 60 | this->got_offsets_.init(); |
f4151f89 | 61 | this->plt_offset_ = 0; |
ead1e424 ILT |
62 | this->type_ = type; |
63 | this->binding_ = binding; | |
64 | this->visibility_ = visibility; | |
65 | this->nonvis_ = nonvis; | |
66 | this->is_target_special_ = false; | |
1564db8d ILT |
67 | this->is_def_ = false; |
68 | this->is_forwarder_ = false; | |
aeddab66 | 69 | this->has_alias_ = false; |
c06b7b0b | 70 | this->needs_dynsym_entry_ = false; |
008db82e | 71 | this->in_reg_ = false; |
ead1e424 | 72 | this->in_dyn_ = false; |
f4151f89 | 73 | this->has_plt_offset_ = false; |
f6ce93d6 | 74 | this->has_warning_ = false; |
46fe1623 | 75 | this->is_copied_from_dynobj_ = false; |
55a93433 | 76 | this->is_forced_local_ = false; |
d491d34e | 77 | this->is_ordinary_shndx_ = false; |
89fc3421 | 78 | this->in_real_elf_ = false; |
ead1e424 ILT |
79 | } |
80 | ||
a2b1aa12 ILT |
81 | // Return the demangled version of the symbol's name, but only |
82 | // if the --demangle flag was set. | |
83 | ||
84 | static std::string | |
85 | demangle(const char* name) | |
86 | { | |
086a1841 | 87 | if (!parameters->options().do_demangle()) |
ff541f30 ILT |
88 | return name; |
89 | ||
a2b1aa12 ILT |
90 | // cplus_demangle allocates memory for the result it returns, |
91 | // and returns NULL if the name is already demangled. | |
92 | char* demangled_name = cplus_demangle(name, DMGL_ANSI | DMGL_PARAMS); | |
93 | if (demangled_name == NULL) | |
94 | return name; | |
95 | ||
96 | std::string retval(demangled_name); | |
97 | free(demangled_name); | |
98 | return retval; | |
99 | } | |
100 | ||
101 | std::string | |
102 | Symbol::demangled_name() const | |
103 | { | |
ff541f30 | 104 | return demangle(this->name()); |
a2b1aa12 ILT |
105 | } |
106 | ||
ead1e424 ILT |
107 | // Initialize the fields in the base class Symbol for SYM in OBJECT. |
108 | ||
109 | template<int size, bool big_endian> | |
110 | void | |
f3e9c5c5 ILT |
111 | Symbol::init_base_object(const char* name, const char* version, Object* object, |
112 | const elfcpp::Sym<size, big_endian>& sym, | |
113 | unsigned int st_shndx, bool is_ordinary) | |
ead1e424 ILT |
114 | { |
115 | this->init_fields(name, version, sym.get_st_type(), sym.get_st_bind(), | |
116 | sym.get_st_visibility(), sym.get_st_nonvis()); | |
117 | this->u_.from_object.object = object; | |
d491d34e ILT |
118 | this->u_.from_object.shndx = st_shndx; |
119 | this->is_ordinary_shndx_ = is_ordinary; | |
ead1e424 | 120 | this->source_ = FROM_OBJECT; |
008db82e | 121 | this->in_reg_ = !object->is_dynamic(); |
1564db8d | 122 | this->in_dyn_ = object->is_dynamic(); |
89fc3421 | 123 | this->in_real_elf_ = object->pluginobj() == NULL; |
14bfc3f5 ILT |
124 | } |
125 | ||
ead1e424 ILT |
126 | // Initialize the fields in the base class Symbol for a symbol defined |
127 | // in an Output_data. | |
128 | ||
129 | void | |
75517b77 ILT |
130 | Symbol::init_base_output_data(const char* name, const char* version, |
131 | Output_data* od, elfcpp::STT type, | |
132 | elfcpp::STB binding, elfcpp::STV visibility, | |
133 | unsigned char nonvis, bool offset_is_from_end) | |
ead1e424 | 134 | { |
75517b77 | 135 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
136 | this->u_.in_output_data.output_data = od; |
137 | this->u_.in_output_data.offset_is_from_end = offset_is_from_end; | |
138 | this->source_ = IN_OUTPUT_DATA; | |
008db82e | 139 | this->in_reg_ = true; |
89fc3421 | 140 | this->in_real_elf_ = true; |
ead1e424 ILT |
141 | } |
142 | ||
143 | // Initialize the fields in the base class Symbol for a symbol defined | |
144 | // in an Output_segment. | |
145 | ||
146 | void | |
75517b77 ILT |
147 | Symbol::init_base_output_segment(const char* name, const char* version, |
148 | Output_segment* os, elfcpp::STT type, | |
149 | elfcpp::STB binding, elfcpp::STV visibility, | |
150 | unsigned char nonvis, | |
f3e9c5c5 | 151 | Segment_offset_base offset_base) |
ead1e424 | 152 | { |
75517b77 | 153 | this->init_fields(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
154 | this->u_.in_output_segment.output_segment = os; |
155 | this->u_.in_output_segment.offset_base = offset_base; | |
156 | this->source_ = IN_OUTPUT_SEGMENT; | |
008db82e | 157 | this->in_reg_ = true; |
89fc3421 | 158 | this->in_real_elf_ = true; |
ead1e424 ILT |
159 | } |
160 | ||
161 | // Initialize the fields in the base class Symbol for a symbol defined | |
162 | // as a constant. | |
163 | ||
164 | void | |
75517b77 ILT |
165 | Symbol::init_base_constant(const char* name, const char* version, |
166 | elfcpp::STT type, elfcpp::STB binding, | |
167 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 168 | { |
75517b77 | 169 | this->init_fields(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
170 | this->source_ = IS_CONSTANT; |
171 | this->in_reg_ = true; | |
89fc3421 | 172 | this->in_real_elf_ = true; |
f3e9c5c5 ILT |
173 | } |
174 | ||
175 | // Initialize the fields in the base class Symbol for an undefined | |
176 | // symbol. | |
177 | ||
178 | void | |
75517b77 ILT |
179 | Symbol::init_base_undefined(const char* name, const char* version, |
180 | elfcpp::STT type, elfcpp::STB binding, | |
181 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 182 | { |
75517b77 | 183 | this->init_fields(name, version, type, binding, visibility, nonvis); |
d7ab2a47 | 184 | this->dynsym_index_ = -1U; |
f3e9c5c5 | 185 | this->source_ = IS_UNDEFINED; |
008db82e | 186 | this->in_reg_ = true; |
89fc3421 | 187 | this->in_real_elf_ = true; |
ead1e424 ILT |
188 | } |
189 | ||
c7912668 ILT |
190 | // Allocate a common symbol in the base. |
191 | ||
192 | void | |
193 | Symbol::allocate_base_common(Output_data* od) | |
194 | { | |
195 | gold_assert(this->is_common()); | |
196 | this->source_ = IN_OUTPUT_DATA; | |
197 | this->u_.in_output_data.output_data = od; | |
198 | this->u_.in_output_data.offset_is_from_end = false; | |
199 | } | |
200 | ||
ead1e424 | 201 | // Initialize the fields in Sized_symbol for SYM in OBJECT. |
14bfc3f5 ILT |
202 | |
203 | template<int size> | |
204 | template<bool big_endian> | |
205 | void | |
f3e9c5c5 ILT |
206 | Sized_symbol<size>::init_object(const char* name, const char* version, |
207 | Object* object, | |
208 | const elfcpp::Sym<size, big_endian>& sym, | |
209 | unsigned int st_shndx, bool is_ordinary) | |
14bfc3f5 | 210 | { |
f3e9c5c5 | 211 | this->init_base_object(name, version, object, sym, st_shndx, is_ordinary); |
14bfc3f5 | 212 | this->value_ = sym.get_st_value(); |
ead1e424 ILT |
213 | this->symsize_ = sym.get_st_size(); |
214 | } | |
215 | ||
216 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
217 | // Output_data. | |
218 | ||
219 | template<int size> | |
220 | void | |
75517b77 ILT |
221 | Sized_symbol<size>::init_output_data(const char* name, const char* version, |
222 | Output_data* od, Value_type value, | |
223 | Size_type symsize, elfcpp::STT type, | |
224 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
225 | elfcpp::STV visibility, |
226 | unsigned char nonvis, | |
227 | bool offset_is_from_end) | |
ead1e424 | 228 | { |
75517b77 ILT |
229 | this->init_base_output_data(name, version, od, type, binding, visibility, |
230 | nonvis, offset_is_from_end); | |
ead1e424 ILT |
231 | this->value_ = value; |
232 | this->symsize_ = symsize; | |
233 | } | |
234 | ||
235 | // Initialize the fields in Sized_symbol for a symbol defined in an | |
236 | // Output_segment. | |
237 | ||
238 | template<int size> | |
239 | void | |
75517b77 ILT |
240 | Sized_symbol<size>::init_output_segment(const char* name, const char* version, |
241 | Output_segment* os, Value_type value, | |
242 | Size_type symsize, elfcpp::STT type, | |
243 | elfcpp::STB binding, | |
f3e9c5c5 ILT |
244 | elfcpp::STV visibility, |
245 | unsigned char nonvis, | |
246 | Segment_offset_base offset_base) | |
ead1e424 | 247 | { |
75517b77 ILT |
248 | this->init_base_output_segment(name, version, os, type, binding, visibility, |
249 | nonvis, offset_base); | |
ead1e424 ILT |
250 | this->value_ = value; |
251 | this->symsize_ = symsize; | |
252 | } | |
253 | ||
254 | // Initialize the fields in Sized_symbol for a symbol defined as a | |
255 | // constant. | |
256 | ||
257 | template<int size> | |
258 | void | |
75517b77 ILT |
259 | Sized_symbol<size>::init_constant(const char* name, const char* version, |
260 | Value_type value, Size_type symsize, | |
261 | elfcpp::STT type, elfcpp::STB binding, | |
262 | elfcpp::STV visibility, unsigned char nonvis) | |
ead1e424 | 263 | { |
75517b77 | 264 | this->init_base_constant(name, version, type, binding, visibility, nonvis); |
ead1e424 ILT |
265 | this->value_ = value; |
266 | this->symsize_ = symsize; | |
14bfc3f5 ILT |
267 | } |
268 | ||
f3e9c5c5 ILT |
269 | // Initialize the fields in Sized_symbol for an undefined symbol. |
270 | ||
271 | template<int size> | |
272 | void | |
75517b77 ILT |
273 | Sized_symbol<size>::init_undefined(const char* name, const char* version, |
274 | elfcpp::STT type, elfcpp::STB binding, | |
275 | elfcpp::STV visibility, unsigned char nonvis) | |
f3e9c5c5 | 276 | { |
75517b77 | 277 | this->init_base_undefined(name, version, type, binding, visibility, nonvis); |
f3e9c5c5 ILT |
278 | this->value_ = 0; |
279 | this->symsize_ = 0; | |
280 | } | |
281 | ||
c7912668 ILT |
282 | // Allocate a common symbol. |
283 | ||
284 | template<int size> | |
285 | void | |
286 | Sized_symbol<size>::allocate_common(Output_data* od, Value_type value) | |
287 | { | |
288 | this->allocate_base_common(od); | |
289 | this->value_ = value; | |
290 | } | |
291 | ||
c82fbeee CS |
292 | // The ""'s around str ensure str is a string literal, so sizeof works. |
293 | #define strprefix(var, str) (strncmp(var, str, sizeof("" str "") - 1) == 0) | |
294 | ||
436ca963 ILT |
295 | // Return true if this symbol should be added to the dynamic symbol |
296 | // table. | |
297 | ||
298 | inline bool | |
299 | Symbol::should_add_dynsym_entry() const | |
300 | { | |
301 | // If the symbol is used by a dynamic relocation, we need to add it. | |
302 | if (this->needs_dynsym_entry()) | |
303 | return true; | |
304 | ||
55a93433 ILT |
305 | // If the symbol was forced local in a version script, do not add it. |
306 | if (this->is_forced_local()) | |
307 | return false; | |
308 | ||
c82fbeee CS |
309 | // If the symbol was forced dynamic in a --dynamic-list file, add it. |
310 | if (parameters->options().in_dynamic_list(this->name())) | |
311 | return true; | |
312 | ||
313 | // If dynamic-list-data was specified, add any STT_OBJECT. | |
314 | if (parameters->options().dynamic_list_data() | |
315 | && !this->is_from_dynobj() | |
316 | && this->type() == elfcpp::STT_OBJECT) | |
317 | return true; | |
318 | ||
319 | // If --dynamic-list-cpp-new was specified, add any new/delete symbol. | |
320 | // If --dynamic-list-cpp-typeinfo was specified, add any typeinfo symbols. | |
321 | if ((parameters->options().dynamic_list_cpp_new() | |
322 | || parameters->options().dynamic_list_cpp_typeinfo()) | |
323 | && !this->is_from_dynobj()) | |
324 | { | |
325 | // TODO(csilvers): We could probably figure out if we're an operator | |
326 | // new/delete or typeinfo without the need to demangle. | |
327 | char* demangled_name = cplus_demangle(this->name(), | |
328 | DMGL_ANSI | DMGL_PARAMS); | |
329 | if (demangled_name == NULL) | |
330 | { | |
331 | // Not a C++ symbol, so it can't satisfy these flags | |
332 | } | |
333 | else if (parameters->options().dynamic_list_cpp_new() | |
334 | && (strprefix(demangled_name, "operator new") | |
335 | || strprefix(demangled_name, "operator delete"))) | |
336 | { | |
337 | free(demangled_name); | |
338 | return true; | |
339 | } | |
340 | else if (parameters->options().dynamic_list_cpp_typeinfo() | |
341 | && (strprefix(demangled_name, "typeinfo name for") | |
342 | || strprefix(demangled_name, "typeinfo for"))) | |
343 | { | |
344 | free(demangled_name); | |
345 | return true; | |
346 | } | |
347 | else | |
348 | free(demangled_name); | |
349 | } | |
350 | ||
436ca963 ILT |
351 | // If exporting all symbols or building a shared library, |
352 | // and the symbol is defined in a regular object and is | |
353 | // externally visible, we need to add it. | |
8851ecca | 354 | if ((parameters->options().export_dynamic() || parameters->options().shared()) |
436ca963 ILT |
355 | && !this->is_from_dynobj() |
356 | && this->is_externally_visible()) | |
357 | return true; | |
358 | ||
359 | return false; | |
360 | } | |
361 | ||
b3b74ddc ILT |
362 | // Return true if the final value of this symbol is known at link |
363 | // time. | |
364 | ||
365 | bool | |
366 | Symbol::final_value_is_known() const | |
367 | { | |
368 | // If we are not generating an executable, then no final values are | |
369 | // known, since they will change at runtime. | |
8851ecca | 370 | if (parameters->options().shared() || parameters->options().relocatable()) |
b3b74ddc ILT |
371 | return false; |
372 | ||
f3e9c5c5 ILT |
373 | // If the symbol is not from an object file, and is not undefined, |
374 | // then it is defined, and known. | |
b3b74ddc | 375 | if (this->source_ != FROM_OBJECT) |
f3e9c5c5 ILT |
376 | { |
377 | if (this->source_ != IS_UNDEFINED) | |
378 | return true; | |
379 | } | |
380 | else | |
381 | { | |
382 | // If the symbol is from a dynamic object, then the final value | |
383 | // is not known. | |
384 | if (this->object()->is_dynamic()) | |
385 | return false; | |
b3b74ddc | 386 | |
f3e9c5c5 ILT |
387 | // If the symbol is not undefined (it is defined or common), |
388 | // then the final value is known. | |
389 | if (!this->is_undefined()) | |
390 | return true; | |
391 | } | |
b3b74ddc ILT |
392 | |
393 | // If the symbol is undefined, then whether the final value is known | |
394 | // depends on whether we are doing a static link. If we are doing a | |
395 | // dynamic link, then the final value could be filled in at runtime. | |
396 | // This could reasonably be the case for a weak undefined symbol. | |
397 | return parameters->doing_static_link(); | |
398 | } | |
399 | ||
77e65537 | 400 | // Return the output section where this symbol is defined. |
a445fddf | 401 | |
77e65537 ILT |
402 | Output_section* |
403 | Symbol::output_section() const | |
a445fddf ILT |
404 | { |
405 | switch (this->source_) | |
406 | { | |
407 | case FROM_OBJECT: | |
77e65537 ILT |
408 | { |
409 | unsigned int shndx = this->u_.from_object.shndx; | |
d491d34e | 410 | if (shndx != elfcpp::SHN_UNDEF && this->is_ordinary_shndx_) |
77e65537 ILT |
411 | { |
412 | gold_assert(!this->u_.from_object.object->is_dynamic()); | |
89fc3421 | 413 | gold_assert(this->u_.from_object.object->pluginobj() == NULL); |
77e65537 | 414 | Relobj* relobj = static_cast<Relobj*>(this->u_.from_object.object); |
ef9beddf | 415 | return relobj->output_section(shndx); |
77e65537 ILT |
416 | } |
417 | return NULL; | |
418 | } | |
419 | ||
a445fddf | 420 | case IN_OUTPUT_DATA: |
77e65537 ILT |
421 | return this->u_.in_output_data.output_data->output_section(); |
422 | ||
a445fddf | 423 | case IN_OUTPUT_SEGMENT: |
f3e9c5c5 ILT |
424 | case IS_CONSTANT: |
425 | case IS_UNDEFINED: | |
77e65537 ILT |
426 | return NULL; |
427 | ||
428 | default: | |
429 | gold_unreachable(); | |
430 | } | |
431 | } | |
432 | ||
433 | // Set the symbol's output section. This is used for symbols defined | |
434 | // in scripts. This should only be called after the symbol table has | |
435 | // been finalized. | |
436 | ||
437 | void | |
438 | Symbol::set_output_section(Output_section* os) | |
439 | { | |
440 | switch (this->source_) | |
441 | { | |
442 | case FROM_OBJECT: | |
443 | case IN_OUTPUT_DATA: | |
444 | gold_assert(this->output_section() == os); | |
445 | break; | |
f3e9c5c5 | 446 | case IS_CONSTANT: |
77e65537 ILT |
447 | this->source_ = IN_OUTPUT_DATA; |
448 | this->u_.in_output_data.output_data = os; | |
449 | this->u_.in_output_data.offset_is_from_end = false; | |
450 | break; | |
451 | case IN_OUTPUT_SEGMENT: | |
f3e9c5c5 | 452 | case IS_UNDEFINED: |
a445fddf ILT |
453 | default: |
454 | gold_unreachable(); | |
455 | } | |
456 | } | |
457 | ||
14bfc3f5 ILT |
458 | // Class Symbol_table. |
459 | ||
09124467 ILT |
460 | Symbol_table::Symbol_table(unsigned int count, |
461 | const Version_script_info& version_script) | |
6d013333 | 462 | : saw_undefined_(0), offset_(0), table_(count), namepool_(), |
155a0dd7 | 463 | forwarders_(), commons_(), tls_commons_(), forced_locals_(), warnings_(), |
55a93433 | 464 | version_script_(version_script) |
14bfc3f5 | 465 | { |
6d013333 | 466 | namepool_.reserve(count); |
14bfc3f5 ILT |
467 | } |
468 | ||
469 | Symbol_table::~Symbol_table() | |
470 | { | |
471 | } | |
472 | ||
ad8f37d1 | 473 | // The hash function. The key values are Stringpool keys. |
14bfc3f5 | 474 | |
ad8f37d1 | 475 | inline size_t |
14bfc3f5 ILT |
476 | Symbol_table::Symbol_table_hash::operator()(const Symbol_table_key& key) const |
477 | { | |
f0641a0b | 478 | return key.first ^ key.second; |
14bfc3f5 ILT |
479 | } |
480 | ||
ad8f37d1 ILT |
481 | // The symbol table key equality function. This is called with |
482 | // Stringpool keys. | |
14bfc3f5 | 483 | |
ad8f37d1 | 484 | inline bool |
14bfc3f5 ILT |
485 | Symbol_table::Symbol_table_eq::operator()(const Symbol_table_key& k1, |
486 | const Symbol_table_key& k2) const | |
487 | { | |
488 | return k1.first == k2.first && k1.second == k2.second; | |
489 | } | |
490 | ||
dd8670e5 | 491 | // Make TO a symbol which forwards to FROM. |
14bfc3f5 ILT |
492 | |
493 | void | |
494 | Symbol_table::make_forwarder(Symbol* from, Symbol* to) | |
495 | { | |
a3ad94ed ILT |
496 | gold_assert(from != to); |
497 | gold_assert(!from->is_forwarder() && !to->is_forwarder()); | |
14bfc3f5 ILT |
498 | this->forwarders_[from] = to; |
499 | from->set_forwarder(); | |
500 | } | |
501 | ||
61ba1cf9 ILT |
502 | // Resolve the forwards from FROM, returning the real symbol. |
503 | ||
14bfc3f5 | 504 | Symbol* |
c06b7b0b | 505 | Symbol_table::resolve_forwards(const Symbol* from) const |
14bfc3f5 | 506 | { |
a3ad94ed | 507 | gold_assert(from->is_forwarder()); |
c06b7b0b | 508 | Unordered_map<const Symbol*, Symbol*>::const_iterator p = |
14bfc3f5 | 509 | this->forwarders_.find(from); |
a3ad94ed | 510 | gold_assert(p != this->forwarders_.end()); |
14bfc3f5 ILT |
511 | return p->second; |
512 | } | |
513 | ||
61ba1cf9 ILT |
514 | // Look up a symbol by name. |
515 | ||
516 | Symbol* | |
517 | Symbol_table::lookup(const char* name, const char* version) const | |
518 | { | |
f0641a0b ILT |
519 | Stringpool::Key name_key; |
520 | name = this->namepool_.find(name, &name_key); | |
61ba1cf9 ILT |
521 | if (name == NULL) |
522 | return NULL; | |
f0641a0b ILT |
523 | |
524 | Stringpool::Key version_key = 0; | |
61ba1cf9 ILT |
525 | if (version != NULL) |
526 | { | |
f0641a0b | 527 | version = this->namepool_.find(version, &version_key); |
61ba1cf9 ILT |
528 | if (version == NULL) |
529 | return NULL; | |
530 | } | |
531 | ||
f0641a0b | 532 | Symbol_table_key key(name_key, version_key); |
61ba1cf9 ILT |
533 | Symbol_table::Symbol_table_type::const_iterator p = this->table_.find(key); |
534 | if (p == this->table_.end()) | |
535 | return NULL; | |
536 | return p->second; | |
537 | } | |
538 | ||
14bfc3f5 ILT |
539 | // Resolve a Symbol with another Symbol. This is only used in the |
540 | // unusual case where there are references to both an unversioned | |
541 | // symbol and a symbol with a version, and we then discover that that | |
1564db8d ILT |
542 | // version is the default version. Because this is unusual, we do |
543 | // this the slow way, by converting back to an ELF symbol. | |
14bfc3f5 | 544 | |
1564db8d | 545 | template<int size, bool big_endian> |
14bfc3f5 | 546 | void |
95d14cd3 | 547 | Symbol_table::resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from) |
14bfc3f5 | 548 | { |
1564db8d ILT |
549 | unsigned char buf[elfcpp::Elf_sizes<size>::sym_size]; |
550 | elfcpp::Sym_write<size, big_endian> esym(buf); | |
d491d34e | 551 | // We don't bother to set the st_name or the st_shndx field. |
1564db8d ILT |
552 | esym.put_st_value(from->value()); |
553 | esym.put_st_size(from->symsize()); | |
554 | esym.put_st_info(from->binding(), from->type()); | |
ead1e424 | 555 | esym.put_st_other(from->visibility(), from->nonvis()); |
d491d34e ILT |
556 | bool is_ordinary; |
557 | unsigned int shndx = from->shndx(&is_ordinary); | |
558 | this->resolve(to, esym.sym(), shndx, is_ordinary, shndx, from->object(), | |
95d14cd3 | 559 | from->version()); |
1ebd95fd ILT |
560 | if (from->in_reg()) |
561 | to->set_in_reg(); | |
562 | if (from->in_dyn()) | |
563 | to->set_in_dyn(); | |
14bfc3f5 ILT |
564 | } |
565 | ||
55a93433 ILT |
566 | // Record that a symbol is forced to be local by a version script. |
567 | ||
568 | void | |
569 | Symbol_table::force_local(Symbol* sym) | |
570 | { | |
571 | if (!sym->is_defined() && !sym->is_common()) | |
572 | return; | |
573 | if (sym->is_forced_local()) | |
574 | { | |
575 | // We already got this one. | |
576 | return; | |
577 | } | |
578 | sym->set_is_forced_local(); | |
579 | this->forced_locals_.push_back(sym); | |
580 | } | |
581 | ||
0864d551 ILT |
582 | // Adjust NAME for wrapping, and update *NAME_KEY if necessary. This |
583 | // is only called for undefined symbols, when at least one --wrap | |
584 | // option was used. | |
585 | ||
586 | const char* | |
587 | Symbol_table::wrap_symbol(Object* object, const char* name, | |
588 | Stringpool::Key* name_key) | |
589 | { | |
590 | // For some targets, we need to ignore a specific character when | |
591 | // wrapping, and add it back later. | |
592 | char prefix = '\0'; | |
593 | if (name[0] == object->target()->wrap_char()) | |
594 | { | |
595 | prefix = name[0]; | |
596 | ++name; | |
597 | } | |
598 | ||
c5818ff1 | 599 | if (parameters->options().is_wrap(name)) |
0864d551 ILT |
600 | { |
601 | // Turn NAME into __wrap_NAME. | |
602 | std::string s; | |
603 | if (prefix != '\0') | |
604 | s += prefix; | |
605 | s += "__wrap_"; | |
606 | s += name; | |
607 | ||
608 | // This will give us both the old and new name in NAMEPOOL_, but | |
609 | // that is OK. Only the versions we need will wind up in the | |
610 | // real string table in the output file. | |
611 | return this->namepool_.add(s.c_str(), true, name_key); | |
612 | } | |
613 | ||
614 | const char* const real_prefix = "__real_"; | |
615 | const size_t real_prefix_length = strlen(real_prefix); | |
616 | if (strncmp(name, real_prefix, real_prefix_length) == 0 | |
c5818ff1 | 617 | && parameters->options().is_wrap(name + real_prefix_length)) |
0864d551 ILT |
618 | { |
619 | // Turn __real_NAME into NAME. | |
620 | std::string s; | |
621 | if (prefix != '\0') | |
622 | s += prefix; | |
623 | s += name + real_prefix_length; | |
624 | return this->namepool_.add(s.c_str(), true, name_key); | |
625 | } | |
626 | ||
627 | return name; | |
628 | } | |
629 | ||
14bfc3f5 ILT |
630 | // Add one symbol from OBJECT to the symbol table. NAME is symbol |
631 | // name and VERSION is the version; both are canonicalized. DEF is | |
d491d34e ILT |
632 | // whether this is the default version. ST_SHNDX is the symbol's |
633 | // section index; IS_ORDINARY is whether this is a normal section | |
634 | // rather than a special code. | |
14bfc3f5 ILT |
635 | |
636 | // If DEF is true, then this is the definition of a default version of | |
637 | // a symbol. That means that any lookup of NAME/NULL and any lookup | |
638 | // of NAME/VERSION should always return the same symbol. This is | |
639 | // obvious for references, but in particular we want to do this for | |
640 | // definitions: overriding NAME/NULL should also override | |
641 | // NAME/VERSION. If we don't do that, it would be very hard to | |
642 | // override functions in a shared library which uses versioning. | |
643 | ||
644 | // We implement this by simply making both entries in the hash table | |
645 | // point to the same Symbol structure. That is easy enough if this is | |
646 | // the first time we see NAME/NULL or NAME/VERSION, but it is possible | |
647 | // that we have seen both already, in which case they will both have | |
648 | // independent entries in the symbol table. We can't simply change | |
649 | // the symbol table entry, because we have pointers to the entries | |
650 | // attached to the object files. So we mark the entry attached to the | |
651 | // object file as a forwarder, and record it in the forwarders_ map. | |
652 | // Note that entries in the hash table will never be marked as | |
653 | // forwarders. | |
70e654ba | 654 | // |
d491d34e ILT |
655 | // ORIG_ST_SHNDX and ST_SHNDX are almost always the same. |
656 | // ORIG_ST_SHNDX is the section index in the input file, or SHN_UNDEF | |
657 | // for a special section code. ST_SHNDX may be modified if the symbol | |
658 | // is defined in a section being discarded. | |
14bfc3f5 ILT |
659 | |
660 | template<int size, bool big_endian> | |
aeddab66 | 661 | Sized_symbol<size>* |
f6ce93d6 | 662 | Symbol_table::add_from_object(Object* object, |
14bfc3f5 | 663 | const char *name, |
f0641a0b ILT |
664 | Stringpool::Key name_key, |
665 | const char *version, | |
666 | Stringpool::Key version_key, | |
667 | bool def, | |
70e654ba | 668 | const elfcpp::Sym<size, big_endian>& sym, |
d491d34e ILT |
669 | unsigned int st_shndx, |
670 | bool is_ordinary, | |
671 | unsigned int orig_st_shndx) | |
14bfc3f5 | 672 | { |
c5818ff1 CC |
673 | // Print a message if this symbol is being traced. |
674 | if (parameters->options().is_trace_symbol(name)) | |
675 | { | |
d491d34e | 676 | if (orig_st_shndx == elfcpp::SHN_UNDEF) |
c5818ff1 CC |
677 | gold_info(_("%s: reference to %s"), object->name().c_str(), name); |
678 | else | |
679 | gold_info(_("%s: definition of %s"), object->name().c_str(), name); | |
680 | } | |
681 | ||
0864d551 ILT |
682 | // For an undefined symbol, we may need to adjust the name using |
683 | // --wrap. | |
d491d34e | 684 | if (orig_st_shndx == elfcpp::SHN_UNDEF |
c5818ff1 | 685 | && parameters->options().any_wrap()) |
0864d551 ILT |
686 | { |
687 | const char* wrap_name = this->wrap_symbol(object, name, &name_key); | |
688 | if (wrap_name != name) | |
689 | { | |
690 | // If we see a reference to malloc with version GLIBC_2.0, | |
691 | // and we turn it into a reference to __wrap_malloc, then we | |
692 | // discard the version number. Otherwise the user would be | |
693 | // required to specify the correct version for | |
694 | // __wrap_malloc. | |
695 | version = NULL; | |
696 | version_key = 0; | |
697 | name = wrap_name; | |
698 | } | |
699 | } | |
700 | ||
14bfc3f5 ILT |
701 | Symbol* const snull = NULL; |
702 | std::pair<typename Symbol_table_type::iterator, bool> ins = | |
f0641a0b ILT |
703 | this->table_.insert(std::make_pair(std::make_pair(name_key, version_key), |
704 | snull)); | |
14bfc3f5 ILT |
705 | |
706 | std::pair<typename Symbol_table_type::iterator, bool> insdef = | |
707 | std::make_pair(this->table_.end(), false); | |
708 | if (def) | |
709 | { | |
f0641a0b ILT |
710 | const Stringpool::Key vnull_key = 0; |
711 | insdef = this->table_.insert(std::make_pair(std::make_pair(name_key, | |
712 | vnull_key), | |
14bfc3f5 ILT |
713 | snull)); |
714 | } | |
715 | ||
716 | // ins.first: an iterator, which is a pointer to a pair. | |
717 | // ins.first->first: the key (a pair of name and version). | |
718 | // ins.first->second: the value (Symbol*). | |
719 | // ins.second: true if new entry was inserted, false if not. | |
720 | ||
1564db8d | 721 | Sized_symbol<size>* ret; |
ead1e424 ILT |
722 | bool was_undefined; |
723 | bool was_common; | |
14bfc3f5 ILT |
724 | if (!ins.second) |
725 | { | |
726 | // We already have an entry for NAME/VERSION. | |
7d1a9ebb | 727 | ret = this->get_sized_symbol<size>(ins.first->second); |
a3ad94ed | 728 | gold_assert(ret != NULL); |
ead1e424 ILT |
729 | |
730 | was_undefined = ret->is_undefined(); | |
731 | was_common = ret->is_common(); | |
732 | ||
d491d34e ILT |
733 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
734 | version); | |
14bfc3f5 ILT |
735 | |
736 | if (def) | |
737 | { | |
738 | if (insdef.second) | |
739 | { | |
740 | // This is the first time we have seen NAME/NULL. Make | |
741 | // NAME/NULL point to NAME/VERSION. | |
742 | insdef.first->second = ret; | |
743 | } | |
a18f591e | 744 | else if (insdef.first->second != ret) |
14bfc3f5 ILT |
745 | { |
746 | // This is the unfortunate case where we already have | |
a18f591e ILT |
747 | // entries for both NAME/VERSION and NAME/NULL. We now |
748 | // see a symbol NAME/VERSION where VERSION is the | |
749 | // default version. We have already resolved this new | |
750 | // symbol with the existing NAME/VERSION symbol. | |
751 | ||
752 | // It's possible that NAME/NULL and NAME/VERSION are | |
753 | // both defined in regular objects. This can only | |
754 | // happen if one object file defines foo and another | |
755 | // defines foo@@ver. This is somewhat obscure, but we | |
756 | // call it a multiple definition error. | |
757 | ||
758 | // It's possible that NAME/NULL actually has a version, | |
759 | // in which case it won't be the same as VERSION. This | |
760 | // happens with ver_test_7.so in the testsuite for the | |
761 | // symbol t2_2. We see t2_2@@VER2, so we define both | |
762 | // t2_2/VER2 and t2_2/NULL. We then see an unadorned | |
763 | // t2_2 in an object file and give it version VER1 from | |
764 | // the version script. This looks like a default | |
765 | // definition for VER1, so it looks like we should merge | |
766 | // t2_2/NULL with t2_2/VER1. That doesn't make sense, | |
767 | // but it's not obvious that this is an error, either. | |
768 | // So we just punt. | |
769 | ||
770 | // If one of the symbols has non-default visibility, and | |
771 | // the other is defined in a shared object, then they | |
772 | // are different symbols. | |
773 | ||
774 | // Otherwise, we just resolve the symbols as though they | |
775 | // were the same. | |
776 | ||
777 | if (insdef.first->second->version() != NULL) | |
778 | { | |
779 | gold_assert(insdef.first->second->version() != version); | |
780 | def = false; | |
781 | } | |
782 | else if (ret->visibility() != elfcpp::STV_DEFAULT | |
783 | && insdef.first->second->is_from_dynobj()) | |
784 | def = false; | |
785 | else if (insdef.first->second->visibility() != elfcpp::STV_DEFAULT | |
786 | && ret->is_from_dynobj()) | |
787 | def = false; | |
788 | else | |
789 | { | |
790 | const Sized_symbol<size>* sym2; | |
791 | sym2 = this->get_sized_symbol<size>(insdef.first->second); | |
95d14cd3 | 792 | Symbol_table::resolve<size, big_endian>(ret, sym2); |
a18f591e ILT |
793 | this->make_forwarder(insdef.first->second, ret); |
794 | insdef.first->second = ret; | |
795 | } | |
14bfc3f5 | 796 | } |
479f6503 ILT |
797 | else |
798 | def = false; | |
14bfc3f5 ILT |
799 | } |
800 | } | |
801 | else | |
802 | { | |
803 | // This is the first time we have seen NAME/VERSION. | |
a3ad94ed | 804 | gold_assert(ins.first->second == NULL); |
ead1e424 | 805 | |
14bfc3f5 ILT |
806 | if (def && !insdef.second) |
807 | { | |
14b31740 ILT |
808 | // We already have an entry for NAME/NULL. If we override |
809 | // it, then change it to NAME/VERSION. | |
7d1a9ebb | 810 | ret = this->get_sized_symbol<size>(insdef.first->second); |
18e6b24e ILT |
811 | |
812 | was_undefined = ret->is_undefined(); | |
813 | was_common = ret->is_common(); | |
814 | ||
d491d34e ILT |
815 | this->resolve(ret, sym, st_shndx, is_ordinary, orig_st_shndx, object, |
816 | version); | |
14bfc3f5 ILT |
817 | ins.first->second = ret; |
818 | } | |
819 | else | |
820 | { | |
18e6b24e ILT |
821 | was_undefined = false; |
822 | was_common = false; | |
823 | ||
f6ce93d6 | 824 | Sized_target<size, big_endian>* target = |
7d1a9ebb | 825 | object->sized_target<size, big_endian>(); |
1564db8d ILT |
826 | if (!target->has_make_symbol()) |
827 | ret = new Sized_symbol<size>(); | |
828 | else | |
14bfc3f5 | 829 | { |
1564db8d ILT |
830 | ret = target->make_symbol(); |
831 | if (ret == NULL) | |
14bfc3f5 ILT |
832 | { |
833 | // This means that we don't want a symbol table | |
834 | // entry after all. | |
835 | if (!def) | |
836 | this->table_.erase(ins.first); | |
837 | else | |
838 | { | |
839 | this->table_.erase(insdef.first); | |
840 | // Inserting insdef invalidated ins. | |
f0641a0b ILT |
841 | this->table_.erase(std::make_pair(name_key, |
842 | version_key)); | |
14bfc3f5 ILT |
843 | } |
844 | return NULL; | |
845 | } | |
846 | } | |
14bfc3f5 | 847 | |
f3e9c5c5 | 848 | ret->init_object(name, version, object, sym, st_shndx, is_ordinary); |
1564db8d | 849 | |
14bfc3f5 ILT |
850 | ins.first->second = ret; |
851 | if (def) | |
852 | { | |
853 | // This is the first time we have seen NAME/NULL. Point | |
854 | // it at the new entry for NAME/VERSION. | |
a3ad94ed | 855 | gold_assert(insdef.second); |
14bfc3f5 ILT |
856 | insdef.first->second = ret; |
857 | } | |
858 | } | |
859 | } | |
860 | ||
ead1e424 ILT |
861 | // Record every time we see a new undefined symbol, to speed up |
862 | // archive groups. | |
863 | if (!was_undefined && ret->is_undefined()) | |
864 | ++this->saw_undefined_; | |
865 | ||
866 | // Keep track of common symbols, to speed up common symbol | |
867 | // allocation. | |
868 | if (!was_common && ret->is_common()) | |
155a0dd7 ILT |
869 | { |
870 | if (ret->type() != elfcpp::STT_TLS) | |
871 | this->commons_.push_back(ret); | |
872 | else | |
873 | this->tls_commons_.push_back(ret); | |
874 | } | |
ead1e424 | 875 | |
be3e6201 ILT |
876 | if (def) |
877 | ret->set_is_default(); | |
14bfc3f5 ILT |
878 | return ret; |
879 | } | |
880 | ||
f6ce93d6 | 881 | // Add all the symbols in a relocatable object to the hash table. |
14bfc3f5 ILT |
882 | |
883 | template<int size, bool big_endian> | |
884 | void | |
dbe717ef ILT |
885 | Symbol_table::add_from_relobj( |
886 | Sized_relobj<size, big_endian>* relobj, | |
f6ce93d6 | 887 | const unsigned char* syms, |
14bfc3f5 | 888 | size_t count, |
d491d34e | 889 | size_t symndx_offset, |
14bfc3f5 ILT |
890 | const char* sym_names, |
891 | size_t sym_name_size, | |
92de84a6 ILT |
892 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, |
893 | size_t *defined) | |
14bfc3f5 | 894 | { |
92de84a6 ILT |
895 | *defined = 0; |
896 | ||
9025d29d | 897 | gold_assert(size == relobj->target()->get_size()); |
8851ecca | 898 | gold_assert(size == parameters->target().get_size()); |
14bfc3f5 | 899 | |
a783673b ILT |
900 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
901 | ||
88dd47ac ILT |
902 | const bool just_symbols = relobj->just_symbols(); |
903 | ||
f6ce93d6 | 904 | const unsigned char* p = syms; |
a783673b | 905 | for (size_t i = 0; i < count; ++i, p += sym_size) |
14bfc3f5 | 906 | { |
92de84a6 ILT |
907 | (*sympointers)[i] = NULL; |
908 | ||
14bfc3f5 ILT |
909 | elfcpp::Sym<size, big_endian> sym(p); |
910 | ||
d491d34e | 911 | unsigned int st_name = sym.get_st_name(); |
14bfc3f5 ILT |
912 | if (st_name >= sym_name_size) |
913 | { | |
75f2446e ILT |
914 | relobj->error(_("bad global symbol name offset %u at %zu"), |
915 | st_name, i); | |
916 | continue; | |
14bfc3f5 ILT |
917 | } |
918 | ||
dbe717ef ILT |
919 | const char* name = sym_names + st_name; |
920 | ||
d491d34e ILT |
921 | bool is_ordinary; |
922 | unsigned int st_shndx = relobj->adjust_sym_shndx(i + symndx_offset, | |
923 | sym.get_st_shndx(), | |
924 | &is_ordinary); | |
925 | unsigned int orig_st_shndx = st_shndx; | |
926 | if (!is_ordinary) | |
927 | orig_st_shndx = elfcpp::SHN_UNDEF; | |
928 | ||
92de84a6 ILT |
929 | if (st_shndx != elfcpp::SHN_UNDEF) |
930 | ++*defined; | |
931 | ||
a783673b ILT |
932 | // A symbol defined in a section which we are not including must |
933 | // be treated as an undefined symbol. | |
a783673b | 934 | if (st_shndx != elfcpp::SHN_UNDEF |
d491d34e | 935 | && is_ordinary |
dbe717ef | 936 | && !relobj->is_section_included(st_shndx)) |
d491d34e | 937 | st_shndx = elfcpp::SHN_UNDEF; |
a783673b | 938 | |
14bfc3f5 ILT |
939 | // In an object file, an '@' in the name separates the symbol |
940 | // name from the version name. If there are two '@' characters, | |
941 | // this is the default version. | |
942 | const char* ver = strchr(name, '@'); | |
057ead22 | 943 | Stringpool::Key ver_key = 0; |
09124467 | 944 | int namelen = 0; |
55a93433 | 945 | // DEF: is the version default? LOCAL: is the symbol forced local? |
09124467 | 946 | bool def = false; |
55a93433 | 947 | bool local = false; |
09124467 ILT |
948 | |
949 | if (ver != NULL) | |
950 | { | |
951 | // The symbol name is of the form foo@VERSION or foo@@VERSION | |
952 | namelen = ver - name; | |
953 | ++ver; | |
954 | if (*ver == '@') | |
955 | { | |
956 | def = true; | |
957 | ++ver; | |
958 | } | |
057ead22 | 959 | ver = this->namepool_.add(ver, true, &ver_key); |
09124467 | 960 | } |
5871526f ILT |
961 | // We don't want to assign a version to an undefined symbol, |
962 | // even if it is listed in the version script. FIXME: What | |
963 | // about a common symbol? | |
057ead22 ILT |
964 | else |
965 | { | |
966 | namelen = strlen(name); | |
967 | if (!this->version_script_.empty() | |
968 | && st_shndx != elfcpp::SHN_UNDEF) | |
969 | { | |
970 | // The symbol name did not have a version, but the | |
971 | // version script may assign a version anyway. | |
972 | std::string version; | |
973 | if (this->version_script_.get_symbol_version(name, &version)) | |
974 | { | |
975 | // The version can be empty if the version script is | |
976 | // only used to force some symbols to be local. | |
977 | if (!version.empty()) | |
978 | { | |
979 | ver = this->namepool_.add_with_length(version.c_str(), | |
980 | version.length(), | |
981 | true, | |
982 | &ver_key); | |
983 | def = true; | |
984 | } | |
985 | } | |
986 | else if (this->version_script_.symbol_is_local(name)) | |
987 | local = true; | |
988 | } | |
989 | } | |
14bfc3f5 | 990 | |
d491d34e ILT |
991 | elfcpp::Sym<size, big_endian>* psym = &sym; |
992 | unsigned char symbuf[sym_size]; | |
993 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
88dd47ac ILT |
994 | if (just_symbols) |
995 | { | |
d491d34e | 996 | memcpy(symbuf, p, sym_size); |
88dd47ac | 997 | elfcpp::Sym_write<size, big_endian> sw(symbuf); |
d491d34e | 998 | if (orig_st_shndx != elfcpp::SHN_UNDEF && is_ordinary) |
88dd47ac ILT |
999 | { |
1000 | // Symbol values in object files are section relative. | |
1001 | // This is normally what we want, but since here we are | |
1002 | // converting the symbol to absolute we need to add the | |
1003 | // section address. The section address in an object | |
1004 | // file is normally zero, but people can use a linker | |
1005 | // script to change it. | |
d491d34e ILT |
1006 | sw.put_st_value(sym.get_st_value() |
1007 | + relobj->section_address(orig_st_shndx)); | |
88dd47ac | 1008 | } |
d491d34e ILT |
1009 | st_shndx = elfcpp::SHN_ABS; |
1010 | is_ordinary = false; | |
88dd47ac ILT |
1011 | psym = &sym2; |
1012 | } | |
1013 | ||
057ead22 ILT |
1014 | Stringpool::Key name_key; |
1015 | name = this->namepool_.add_with_length(name, namelen, true, | |
1016 | &name_key); | |
1017 | ||
aeddab66 | 1018 | Sized_symbol<size>* res; |
057ead22 ILT |
1019 | res = this->add_from_object(relobj, name, name_key, ver, ver_key, |
1020 | def, *psym, st_shndx, is_ordinary, | |
1021 | orig_st_shndx); | |
f0641a0b | 1022 | |
057ead22 ILT |
1023 | if (local) |
1024 | this->force_local(res); | |
14bfc3f5 | 1025 | |
730cdc88 | 1026 | (*sympointers)[i] = res; |
14bfc3f5 ILT |
1027 | } |
1028 | } | |
1029 | ||
89fc3421 CC |
1030 | // Add a symbol from a plugin-claimed file. |
1031 | ||
1032 | template<int size, bool big_endian> | |
1033 | Symbol* | |
1034 | Symbol_table::add_from_pluginobj( | |
1035 | Sized_pluginobj<size, big_endian>* obj, | |
1036 | const char* name, | |
1037 | const char* ver, | |
1038 | elfcpp::Sym<size, big_endian>* sym) | |
1039 | { | |
1040 | unsigned int st_shndx = sym->get_st_shndx(); | |
1041 | ||
1042 | Stringpool::Key ver_key = 0; | |
1043 | bool def = false; | |
1044 | bool local = false; | |
1045 | ||
1046 | if (ver != NULL) | |
1047 | { | |
1048 | ver = this->namepool_.add(ver, true, &ver_key); | |
1049 | } | |
1050 | // We don't want to assign a version to an undefined symbol, | |
1051 | // even if it is listed in the version script. FIXME: What | |
1052 | // about a common symbol? | |
1053 | else | |
1054 | { | |
1055 | if (!this->version_script_.empty() | |
1056 | && st_shndx != elfcpp::SHN_UNDEF) | |
1057 | { | |
1058 | // The symbol name did not have a version, but the | |
1059 | // version script may assign a version anyway. | |
1060 | std::string version; | |
1061 | if (this->version_script_.get_symbol_version(name, &version)) | |
1062 | { | |
1063 | // The version can be empty if the version script is | |
1064 | // only used to force some symbols to be local. | |
1065 | if (!version.empty()) | |
1066 | { | |
1067 | ver = this->namepool_.add_with_length(version.c_str(), | |
1068 | version.length(), | |
1069 | true, | |
1070 | &ver_key); | |
1071 | def = true; | |
1072 | } | |
1073 | } | |
1074 | else if (this->version_script_.symbol_is_local(name)) | |
1075 | local = true; | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | Stringpool::Key name_key; | |
1080 | name = this->namepool_.add(name, true, &name_key); | |
1081 | ||
1082 | Sized_symbol<size>* res; | |
1083 | res = this->add_from_object(obj, name, name_key, ver, ver_key, | |
1084 | def, *sym, st_shndx, true, st_shndx); | |
1085 | ||
1086 | if (local) | |
1087 | this->force_local(res); | |
1088 | ||
1089 | return res; | |
1090 | } | |
1091 | ||
dbe717ef ILT |
1092 | // Add all the symbols in a dynamic object to the hash table. |
1093 | ||
1094 | template<int size, bool big_endian> | |
1095 | void | |
1096 | Symbol_table::add_from_dynobj( | |
1097 | Sized_dynobj<size, big_endian>* dynobj, | |
1098 | const unsigned char* syms, | |
1099 | size_t count, | |
1100 | const char* sym_names, | |
1101 | size_t sym_name_size, | |
1102 | const unsigned char* versym, | |
1103 | size_t versym_size, | |
92de84a6 ILT |
1104 | const std::vector<const char*>* version_map, |
1105 | typename Sized_relobj<size, big_endian>::Symbols* sympointers, | |
1106 | size_t* defined) | |
dbe717ef | 1107 | { |
92de84a6 ILT |
1108 | *defined = 0; |
1109 | ||
9025d29d | 1110 | gold_assert(size == dynobj->target()->get_size()); |
8851ecca | 1111 | gold_assert(size == parameters->target().get_size()); |
dbe717ef | 1112 | |
88dd47ac ILT |
1113 | if (dynobj->just_symbols()) |
1114 | { | |
1115 | gold_error(_("--just-symbols does not make sense with a shared object")); | |
1116 | return; | |
1117 | } | |
1118 | ||
dbe717ef ILT |
1119 | if (versym != NULL && versym_size / 2 < count) |
1120 | { | |
75f2446e ILT |
1121 | dynobj->error(_("too few symbol versions")); |
1122 | return; | |
dbe717ef ILT |
1123 | } |
1124 | ||
1125 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1126 | ||
aeddab66 ILT |
1127 | // We keep a list of all STT_OBJECT symbols, so that we can resolve |
1128 | // weak aliases. This is necessary because if the dynamic object | |
1129 | // provides the same variable under two names, one of which is a | |
1130 | // weak definition, and the regular object refers to the weak | |
1131 | // definition, we have to put both the weak definition and the | |
1132 | // strong definition into the dynamic symbol table. Given a weak | |
1133 | // definition, the only way that we can find the corresponding | |
1134 | // strong definition, if any, is to search the symbol table. | |
1135 | std::vector<Sized_symbol<size>*> object_symbols; | |
1136 | ||
dbe717ef ILT |
1137 | const unsigned char* p = syms; |
1138 | const unsigned char* vs = versym; | |
1139 | for (size_t i = 0; i < count; ++i, p += sym_size, vs += 2) | |
1140 | { | |
1141 | elfcpp::Sym<size, big_endian> sym(p); | |
1142 | ||
92de84a6 ILT |
1143 | if (sympointers != NULL) |
1144 | (*sympointers)[i] = NULL; | |
1145 | ||
65778909 ILT |
1146 | // Ignore symbols with local binding or that have |
1147 | // internal or hidden visibility. | |
1148 | if (sym.get_st_bind() == elfcpp::STB_LOCAL | |
1149 | || sym.get_st_visibility() == elfcpp::STV_INTERNAL | |
1150 | || sym.get_st_visibility() == elfcpp::STV_HIDDEN) | |
dbe717ef ILT |
1151 | continue; |
1152 | ||
8bdcdf2c ILT |
1153 | // A protected symbol in a shared library must be treated as a |
1154 | // normal symbol when viewed from outside the shared library. | |
1155 | // Implement this by overriding the visibility here. | |
1156 | elfcpp::Sym<size, big_endian>* psym = &sym; | |
1157 | unsigned char symbuf[sym_size]; | |
1158 | elfcpp::Sym<size, big_endian> sym2(symbuf); | |
1159 | if (sym.get_st_visibility() == elfcpp::STV_PROTECTED) | |
1160 | { | |
1161 | memcpy(symbuf, p, sym_size); | |
1162 | elfcpp::Sym_write<size, big_endian> sw(symbuf); | |
1163 | sw.put_st_other(elfcpp::STV_DEFAULT, sym.get_st_nonvis()); | |
1164 | psym = &sym2; | |
1165 | } | |
1166 | ||
1167 | unsigned int st_name = psym->get_st_name(); | |
dbe717ef ILT |
1168 | if (st_name >= sym_name_size) |
1169 | { | |
75f2446e ILT |
1170 | dynobj->error(_("bad symbol name offset %u at %zu"), |
1171 | st_name, i); | |
1172 | continue; | |
dbe717ef ILT |
1173 | } |
1174 | ||
1175 | const char* name = sym_names + st_name; | |
1176 | ||
d491d34e | 1177 | bool is_ordinary; |
8bdcdf2c | 1178 | unsigned int st_shndx = dynobj->adjust_sym_shndx(i, psym->get_st_shndx(), |
d491d34e ILT |
1179 | &is_ordinary); |
1180 | ||
92de84a6 ILT |
1181 | if (st_shndx != elfcpp::SHN_UNDEF) |
1182 | ++*defined; | |
1183 | ||
aeddab66 ILT |
1184 | Sized_symbol<size>* res; |
1185 | ||
dbe717ef ILT |
1186 | if (versym == NULL) |
1187 | { | |
1188 | Stringpool::Key name_key; | |
cfd73a4e | 1189 | name = this->namepool_.add(name, true, &name_key); |
aeddab66 | 1190 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, |
8bdcdf2c | 1191 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1192 | st_shndx); |
dbe717ef | 1193 | } |
aeddab66 ILT |
1194 | else |
1195 | { | |
1196 | // Read the version information. | |
dbe717ef | 1197 | |
aeddab66 | 1198 | unsigned int v = elfcpp::Swap<16, big_endian>::readval(vs); |
dbe717ef | 1199 | |
aeddab66 ILT |
1200 | bool hidden = (v & elfcpp::VERSYM_HIDDEN) != 0; |
1201 | v &= elfcpp::VERSYM_VERSION; | |
dbe717ef | 1202 | |
aeddab66 ILT |
1203 | // The Sun documentation says that V can be VER_NDX_LOCAL, |
1204 | // or VER_NDX_GLOBAL, or a version index. The meaning of | |
1205 | // VER_NDX_LOCAL is defined as "Symbol has local scope." | |
1206 | // The old GNU linker will happily generate VER_NDX_LOCAL | |
1207 | // for an undefined symbol. I don't know what the Sun | |
1208 | // linker will generate. | |
dbe717ef | 1209 | |
aeddab66 | 1210 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
d491d34e | 1211 | && st_shndx != elfcpp::SHN_UNDEF) |
aeddab66 ILT |
1212 | { |
1213 | // This symbol should not be visible outside the object. | |
1214 | continue; | |
1215 | } | |
64707334 | 1216 | |
aeddab66 ILT |
1217 | // At this point we are definitely going to add this symbol. |
1218 | Stringpool::Key name_key; | |
1219 | name = this->namepool_.add(name, true, &name_key); | |
dbe717ef | 1220 | |
aeddab66 ILT |
1221 | if (v == static_cast<unsigned int>(elfcpp::VER_NDX_LOCAL) |
1222 | || v == static_cast<unsigned int>(elfcpp::VER_NDX_GLOBAL)) | |
1223 | { | |
1224 | // This symbol does not have a version. | |
1225 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1226 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1227 | st_shndx); |
aeddab66 ILT |
1228 | } |
1229 | else | |
1230 | { | |
1231 | if (v >= version_map->size()) | |
1232 | { | |
1233 | dynobj->error(_("versym for symbol %zu out of range: %u"), | |
1234 | i, v); | |
1235 | continue; | |
1236 | } | |
dbe717ef | 1237 | |
aeddab66 ILT |
1238 | const char* version = (*version_map)[v]; |
1239 | if (version == NULL) | |
1240 | { | |
1241 | dynobj->error(_("versym for symbol %zu has no name: %u"), | |
1242 | i, v); | |
1243 | continue; | |
1244 | } | |
dbe717ef | 1245 | |
aeddab66 ILT |
1246 | Stringpool::Key version_key; |
1247 | version = this->namepool_.add(version, true, &version_key); | |
1248 | ||
1249 | // If this is an absolute symbol, and the version name | |
1250 | // and symbol name are the same, then this is the | |
1251 | // version definition symbol. These symbols exist to | |
1252 | // support using -u to pull in particular versions. We | |
1253 | // do not want to record a version for them. | |
d491d34e ILT |
1254 | if (st_shndx == elfcpp::SHN_ABS |
1255 | && !is_ordinary | |
aeddab66 ILT |
1256 | && name_key == version_key) |
1257 | res = this->add_from_object(dynobj, name, name_key, NULL, 0, | |
8bdcdf2c | 1258 | false, *psym, st_shndx, is_ordinary, |
d491d34e | 1259 | st_shndx); |
aeddab66 ILT |
1260 | else |
1261 | { | |
1262 | const bool def = (!hidden | |
d491d34e | 1263 | && st_shndx != elfcpp::SHN_UNDEF); |
aeddab66 | 1264 | res = this->add_from_object(dynobj, name, name_key, version, |
8bdcdf2c | 1265 | version_key, def, *psym, st_shndx, |
d491d34e | 1266 | is_ordinary, st_shndx); |
aeddab66 ILT |
1267 | } |
1268 | } | |
dbe717ef ILT |
1269 | } |
1270 | ||
99a37bfd | 1271 | // Note that it is possible that RES was overridden by an |
a4bb589a | 1272 | // earlier object, in which case it can't be aliased here. |
d491d34e ILT |
1273 | if (st_shndx != elfcpp::SHN_UNDEF |
1274 | && is_ordinary | |
8bdcdf2c | 1275 | && psym->get_st_type() == elfcpp::STT_OBJECT |
99a37bfd ILT |
1276 | && res->source() == Symbol::FROM_OBJECT |
1277 | && res->object() == dynobj) | |
aeddab66 | 1278 | object_symbols.push_back(res); |
92de84a6 ILT |
1279 | |
1280 | if (sympointers != NULL) | |
1281 | (*sympointers)[i] = res; | |
aeddab66 ILT |
1282 | } |
1283 | ||
1284 | this->record_weak_aliases(&object_symbols); | |
1285 | } | |
1286 | ||
1287 | // This is used to sort weak aliases. We sort them first by section | |
1288 | // index, then by offset, then by weak ahead of strong. | |
1289 | ||
1290 | template<int size> | |
1291 | class Weak_alias_sorter | |
1292 | { | |
1293 | public: | |
1294 | bool operator()(const Sized_symbol<size>*, const Sized_symbol<size>*) const; | |
1295 | }; | |
1296 | ||
1297 | template<int size> | |
1298 | bool | |
1299 | Weak_alias_sorter<size>::operator()(const Sized_symbol<size>* s1, | |
1300 | const Sized_symbol<size>* s2) const | |
1301 | { | |
d491d34e ILT |
1302 | bool is_ordinary; |
1303 | unsigned int s1_shndx = s1->shndx(&is_ordinary); | |
1304 | gold_assert(is_ordinary); | |
1305 | unsigned int s2_shndx = s2->shndx(&is_ordinary); | |
1306 | gold_assert(is_ordinary); | |
1307 | if (s1_shndx != s2_shndx) | |
1308 | return s1_shndx < s2_shndx; | |
1309 | ||
aeddab66 ILT |
1310 | if (s1->value() != s2->value()) |
1311 | return s1->value() < s2->value(); | |
1312 | if (s1->binding() != s2->binding()) | |
1313 | { | |
1314 | if (s1->binding() == elfcpp::STB_WEAK) | |
1315 | return true; | |
1316 | if (s2->binding() == elfcpp::STB_WEAK) | |
1317 | return false; | |
1318 | } | |
1319 | return std::string(s1->name()) < std::string(s2->name()); | |
1320 | } | |
dbe717ef | 1321 | |
aeddab66 ILT |
1322 | // SYMBOLS is a list of object symbols from a dynamic object. Look |
1323 | // for any weak aliases, and record them so that if we add the weak | |
1324 | // alias to the dynamic symbol table, we also add the corresponding | |
1325 | // strong symbol. | |
dbe717ef | 1326 | |
aeddab66 ILT |
1327 | template<int size> |
1328 | void | |
1329 | Symbol_table::record_weak_aliases(std::vector<Sized_symbol<size>*>* symbols) | |
1330 | { | |
1331 | // Sort the vector by section index, then by offset, then by weak | |
1332 | // ahead of strong. | |
1333 | std::sort(symbols->begin(), symbols->end(), Weak_alias_sorter<size>()); | |
1334 | ||
1335 | // Walk through the vector. For each weak definition, record | |
1336 | // aliases. | |
1337 | for (typename std::vector<Sized_symbol<size>*>::const_iterator p = | |
1338 | symbols->begin(); | |
1339 | p != symbols->end(); | |
1340 | ++p) | |
1341 | { | |
1342 | if ((*p)->binding() != elfcpp::STB_WEAK) | |
1343 | continue; | |
1344 | ||
1345 | // Build a circular list of weak aliases. Each symbol points to | |
1346 | // the next one in the circular list. | |
1347 | ||
1348 | Sized_symbol<size>* from_sym = *p; | |
1349 | typename std::vector<Sized_symbol<size>*>::const_iterator q; | |
1350 | for (q = p + 1; q != symbols->end(); ++q) | |
dbe717ef | 1351 | { |
d491d34e ILT |
1352 | bool dummy; |
1353 | if ((*q)->shndx(&dummy) != from_sym->shndx(&dummy) | |
aeddab66 ILT |
1354 | || (*q)->value() != from_sym->value()) |
1355 | break; | |
1356 | ||
1357 | this->weak_aliases_[from_sym] = *q; | |
1358 | from_sym->set_has_alias(); | |
1359 | from_sym = *q; | |
dbe717ef ILT |
1360 | } |
1361 | ||
aeddab66 ILT |
1362 | if (from_sym != *p) |
1363 | { | |
1364 | this->weak_aliases_[from_sym] = *p; | |
1365 | from_sym->set_has_alias(); | |
1366 | } | |
dbe717ef | 1367 | |
aeddab66 | 1368 | p = q - 1; |
dbe717ef ILT |
1369 | } |
1370 | } | |
1371 | ||
ead1e424 ILT |
1372 | // Create and return a specially defined symbol. If ONLY_IF_REF is |
1373 | // true, then only create the symbol if there is a reference to it. | |
86f2e683 | 1374 | // If this does not return NULL, it sets *POLDSYM to the existing |
306d9ef0 | 1375 | // symbol if there is one. This canonicalizes *PNAME and *PVERSION. |
ead1e424 ILT |
1376 | |
1377 | template<int size, bool big_endian> | |
1378 | Sized_symbol<size>* | |
9b07f471 ILT |
1379 | Symbol_table::define_special_symbol(const char** pname, const char** pversion, |
1380 | bool only_if_ref, | |
7d1a9ebb | 1381 | Sized_symbol<size>** poldsym) |
ead1e424 | 1382 | { |
ead1e424 ILT |
1383 | Symbol* oldsym; |
1384 | Sized_symbol<size>* sym; | |
86f2e683 ILT |
1385 | bool add_to_table = false; |
1386 | typename Symbol_table_type::iterator add_loc = this->table_.end(); | |
ead1e424 | 1387 | |
55a93433 ILT |
1388 | // If the caller didn't give us a version, see if we get one from |
1389 | // the version script. | |
057ead22 | 1390 | std::string v; |
55a93433 ILT |
1391 | if (*pversion == NULL) |
1392 | { | |
057ead22 ILT |
1393 | if (this->version_script_.get_symbol_version(*pname, &v)) |
1394 | { | |
1395 | if (!v.empty()) | |
1396 | *pversion = v.c_str(); | |
1397 | } | |
55a93433 ILT |
1398 | } |
1399 | ||
ead1e424 ILT |
1400 | if (only_if_ref) |
1401 | { | |
306d9ef0 | 1402 | oldsym = this->lookup(*pname, *pversion); |
f6ce93d6 | 1403 | if (oldsym == NULL || !oldsym->is_undefined()) |
ead1e424 | 1404 | return NULL; |
306d9ef0 ILT |
1405 | |
1406 | *pname = oldsym->name(); | |
1407 | *pversion = oldsym->version(); | |
ead1e424 ILT |
1408 | } |
1409 | else | |
1410 | { | |
14b31740 | 1411 | // Canonicalize NAME and VERSION. |
f0641a0b | 1412 | Stringpool::Key name_key; |
cfd73a4e | 1413 | *pname = this->namepool_.add(*pname, true, &name_key); |
ead1e424 | 1414 | |
14b31740 | 1415 | Stringpool::Key version_key = 0; |
306d9ef0 | 1416 | if (*pversion != NULL) |
cfd73a4e | 1417 | *pversion = this->namepool_.add(*pversion, true, &version_key); |
14b31740 | 1418 | |
ead1e424 | 1419 | Symbol* const snull = NULL; |
ead1e424 | 1420 | std::pair<typename Symbol_table_type::iterator, bool> ins = |
14b31740 ILT |
1421 | this->table_.insert(std::make_pair(std::make_pair(name_key, |
1422 | version_key), | |
ead1e424 ILT |
1423 | snull)); |
1424 | ||
1425 | if (!ins.second) | |
1426 | { | |
14b31740 | 1427 | // We already have a symbol table entry for NAME/VERSION. |
ead1e424 | 1428 | oldsym = ins.first->second; |
a3ad94ed | 1429 | gold_assert(oldsym != NULL); |
ead1e424 ILT |
1430 | } |
1431 | else | |
1432 | { | |
1433 | // We haven't seen this symbol before. | |
a3ad94ed | 1434 | gold_assert(ins.first->second == NULL); |
86f2e683 ILT |
1435 | add_to_table = true; |
1436 | add_loc = ins.first; | |
ead1e424 ILT |
1437 | oldsym = NULL; |
1438 | } | |
1439 | } | |
1440 | ||
8851ecca ILT |
1441 | const Target& target = parameters->target(); |
1442 | if (!target.has_make_symbol()) | |
86f2e683 ILT |
1443 | sym = new Sized_symbol<size>(); |
1444 | else | |
ead1e424 | 1445 | { |
8851ecca ILT |
1446 | gold_assert(target.get_size() == size); |
1447 | gold_assert(target.is_big_endian() ? big_endian : !big_endian); | |
86f2e683 ILT |
1448 | typedef Sized_target<size, big_endian> My_target; |
1449 | const My_target* sized_target = | |
8851ecca | 1450 | static_cast<const My_target*>(&target); |
86f2e683 ILT |
1451 | sym = sized_target->make_symbol(); |
1452 | if (sym == NULL) | |
1453 | return NULL; | |
1454 | } | |
ead1e424 | 1455 | |
86f2e683 ILT |
1456 | if (add_to_table) |
1457 | add_loc->second = sym; | |
1458 | else | |
1459 | gold_assert(oldsym != NULL); | |
ead1e424 | 1460 | |
7d1a9ebb | 1461 | *poldsym = this->get_sized_symbol<size>(oldsym); |
ead1e424 ILT |
1462 | |
1463 | return sym; | |
1464 | } | |
1465 | ||
1466 | // Define a symbol based on an Output_data. | |
1467 | ||
14b31740 | 1468 | Symbol* |
9b07f471 ILT |
1469 | Symbol_table::define_in_output_data(const char* name, |
1470 | const char* version, | |
1471 | Output_data* od, | |
1472 | uint64_t value, | |
1473 | uint64_t symsize, | |
1474 | elfcpp::STT type, | |
1475 | elfcpp::STB binding, | |
ead1e424 ILT |
1476 | elfcpp::STV visibility, |
1477 | unsigned char nonvis, | |
1478 | bool offset_is_from_end, | |
1479 | bool only_if_ref) | |
1480 | { | |
8851ecca | 1481 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1482 | { |
1483 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1484 | return this->do_define_in_output_data<32>(name, version, od, |
86f2e683 ILT |
1485 | value, symsize, type, binding, |
1486 | visibility, nonvis, | |
1487 | offset_is_from_end, | |
1488 | only_if_ref); | |
1489 | #else | |
1490 | gold_unreachable(); | |
1491 | #endif | |
1492 | } | |
8851ecca | 1493 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1494 | { |
1495 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1496 | return this->do_define_in_output_data<64>(name, version, od, |
86f2e683 ILT |
1497 | value, symsize, type, binding, |
1498 | visibility, nonvis, | |
1499 | offset_is_from_end, | |
1500 | only_if_ref); | |
1501 | #else | |
1502 | gold_unreachable(); | |
1503 | #endif | |
1504 | } | |
ead1e424 | 1505 | else |
a3ad94ed | 1506 | gold_unreachable(); |
ead1e424 ILT |
1507 | } |
1508 | ||
1509 | // Define a symbol in an Output_data, sized version. | |
1510 | ||
1511 | template<int size> | |
14b31740 | 1512 | Sized_symbol<size>* |
ead1e424 | 1513 | Symbol_table::do_define_in_output_data( |
ead1e424 | 1514 | const char* name, |
14b31740 | 1515 | const char* version, |
ead1e424 ILT |
1516 | Output_data* od, |
1517 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1518 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1519 | elfcpp::STT type, | |
1520 | elfcpp::STB binding, | |
1521 | elfcpp::STV visibility, | |
1522 | unsigned char nonvis, | |
1523 | bool offset_is_from_end, | |
1524 | bool only_if_ref) | |
1525 | { | |
1526 | Sized_symbol<size>* sym; | |
86f2e683 | 1527 | Sized_symbol<size>* oldsym; |
ead1e424 | 1528 | |
8851ecca | 1529 | if (parameters->target().is_big_endian()) |
193a53d9 ILT |
1530 | { |
1531 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1532 | sym = this->define_special_symbol<size, true>(&name, &version, |
1533 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1534 | #else |
1535 | gold_unreachable(); | |
1536 | #endif | |
1537 | } | |
ead1e424 | 1538 | else |
193a53d9 ILT |
1539 | { |
1540 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1541 | sym = this->define_special_symbol<size, false>(&name, &version, |
1542 | only_if_ref, &oldsym); | |
193a53d9 ILT |
1543 | #else |
1544 | gold_unreachable(); | |
1545 | #endif | |
1546 | } | |
ead1e424 ILT |
1547 | |
1548 | if (sym == NULL) | |
14b31740 | 1549 | return NULL; |
ead1e424 | 1550 | |
75517b77 ILT |
1551 | sym->init_output_data(name, version, od, value, symsize, type, binding, |
1552 | visibility, nonvis, offset_is_from_end); | |
14b31740 | 1553 | |
e5756efb | 1554 | if (oldsym == NULL) |
55a93433 ILT |
1555 | { |
1556 | if (binding == elfcpp::STB_LOCAL | |
1557 | || this->version_script_.symbol_is_local(name)) | |
1558 | this->force_local(sym); | |
75517b77 ILT |
1559 | else if (version != NULL) |
1560 | sym->set_is_default(); | |
55a93433 ILT |
1561 | return sym; |
1562 | } | |
86f2e683 | 1563 | |
e5756efb ILT |
1564 | if (Symbol_table::should_override_with_special(oldsym)) |
1565 | this->override_with_special(oldsym, sym); | |
1566 | delete sym; | |
1567 | return oldsym; | |
ead1e424 ILT |
1568 | } |
1569 | ||
1570 | // Define a symbol based on an Output_segment. | |
1571 | ||
14b31740 | 1572 | Symbol* |
9b07f471 | 1573 | Symbol_table::define_in_output_segment(const char* name, |
14b31740 | 1574 | const char* version, Output_segment* os, |
9b07f471 ILT |
1575 | uint64_t value, |
1576 | uint64_t symsize, | |
1577 | elfcpp::STT type, | |
1578 | elfcpp::STB binding, | |
ead1e424 ILT |
1579 | elfcpp::STV visibility, |
1580 | unsigned char nonvis, | |
1581 | Symbol::Segment_offset_base offset_base, | |
1582 | bool only_if_ref) | |
1583 | { | |
8851ecca | 1584 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1585 | { |
1586 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1587 | return this->do_define_in_output_segment<32>(name, version, os, |
86f2e683 ILT |
1588 | value, symsize, type, |
1589 | binding, visibility, nonvis, | |
1590 | offset_base, only_if_ref); | |
1591 | #else | |
1592 | gold_unreachable(); | |
1593 | #endif | |
1594 | } | |
8851ecca | 1595 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1596 | { |
1597 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1598 | return this->do_define_in_output_segment<64>(name, version, os, |
86f2e683 ILT |
1599 | value, symsize, type, |
1600 | binding, visibility, nonvis, | |
1601 | offset_base, only_if_ref); | |
1602 | #else | |
1603 | gold_unreachable(); | |
1604 | #endif | |
1605 | } | |
ead1e424 | 1606 | else |
a3ad94ed | 1607 | gold_unreachable(); |
ead1e424 ILT |
1608 | } |
1609 | ||
1610 | // Define a symbol in an Output_segment, sized version. | |
1611 | ||
1612 | template<int size> | |
14b31740 | 1613 | Sized_symbol<size>* |
ead1e424 | 1614 | Symbol_table::do_define_in_output_segment( |
ead1e424 | 1615 | const char* name, |
14b31740 | 1616 | const char* version, |
ead1e424 ILT |
1617 | Output_segment* os, |
1618 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
1619 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1620 | elfcpp::STT type, | |
1621 | elfcpp::STB binding, | |
1622 | elfcpp::STV visibility, | |
1623 | unsigned char nonvis, | |
1624 | Symbol::Segment_offset_base offset_base, | |
1625 | bool only_if_ref) | |
1626 | { | |
1627 | Sized_symbol<size>* sym; | |
86f2e683 | 1628 | Sized_symbol<size>* oldsym; |
ead1e424 | 1629 | |
8851ecca | 1630 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1631 | { |
1632 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1633 | sym = this->define_special_symbol<size, true>(&name, &version, |
1634 | only_if_ref, &oldsym); | |
9025d29d ILT |
1635 | #else |
1636 | gold_unreachable(); | |
1637 | #endif | |
1638 | } | |
ead1e424 | 1639 | else |
9025d29d ILT |
1640 | { |
1641 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1642 | sym = this->define_special_symbol<size, false>(&name, &version, |
1643 | only_if_ref, &oldsym); | |
9025d29d ILT |
1644 | #else |
1645 | gold_unreachable(); | |
1646 | #endif | |
1647 | } | |
ead1e424 ILT |
1648 | |
1649 | if (sym == NULL) | |
14b31740 | 1650 | return NULL; |
ead1e424 | 1651 | |
75517b77 | 1652 | sym->init_output_segment(name, version, os, value, symsize, type, binding, |
f3e9c5c5 | 1653 | visibility, nonvis, offset_base); |
14b31740 | 1654 | |
e5756efb | 1655 | if (oldsym == NULL) |
55a93433 ILT |
1656 | { |
1657 | if (binding == elfcpp::STB_LOCAL | |
1658 | || this->version_script_.symbol_is_local(name)) | |
1659 | this->force_local(sym); | |
75517b77 ILT |
1660 | else if (version != NULL) |
1661 | sym->set_is_default(); | |
55a93433 ILT |
1662 | return sym; |
1663 | } | |
86f2e683 | 1664 | |
e5756efb ILT |
1665 | if (Symbol_table::should_override_with_special(oldsym)) |
1666 | this->override_with_special(oldsym, sym); | |
1667 | delete sym; | |
1668 | return oldsym; | |
ead1e424 ILT |
1669 | } |
1670 | ||
1671 | // Define a special symbol with a constant value. It is a multiple | |
1672 | // definition error if this symbol is already defined. | |
1673 | ||
14b31740 | 1674 | Symbol* |
9b07f471 ILT |
1675 | Symbol_table::define_as_constant(const char* name, |
1676 | const char* version, | |
1677 | uint64_t value, | |
1678 | uint64_t symsize, | |
1679 | elfcpp::STT type, | |
1680 | elfcpp::STB binding, | |
1681 | elfcpp::STV visibility, | |
1682 | unsigned char nonvis, | |
caa9d5d9 ILT |
1683 | bool only_if_ref, |
1684 | bool force_override) | |
ead1e424 | 1685 | { |
8851ecca | 1686 | if (parameters->target().get_size() == 32) |
86f2e683 ILT |
1687 | { |
1688 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
9b07f471 | 1689 | return this->do_define_as_constant<32>(name, version, value, |
86f2e683 | 1690 | symsize, type, binding, |
caa9d5d9 ILT |
1691 | visibility, nonvis, only_if_ref, |
1692 | force_override); | |
86f2e683 ILT |
1693 | #else |
1694 | gold_unreachable(); | |
1695 | #endif | |
1696 | } | |
8851ecca | 1697 | else if (parameters->target().get_size() == 64) |
86f2e683 ILT |
1698 | { |
1699 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
9b07f471 | 1700 | return this->do_define_as_constant<64>(name, version, value, |
86f2e683 | 1701 | symsize, type, binding, |
caa9d5d9 ILT |
1702 | visibility, nonvis, only_if_ref, |
1703 | force_override); | |
86f2e683 ILT |
1704 | #else |
1705 | gold_unreachable(); | |
1706 | #endif | |
1707 | } | |
ead1e424 | 1708 | else |
a3ad94ed | 1709 | gold_unreachable(); |
ead1e424 ILT |
1710 | } |
1711 | ||
1712 | // Define a symbol as a constant, sized version. | |
1713 | ||
1714 | template<int size> | |
14b31740 | 1715 | Sized_symbol<size>* |
ead1e424 | 1716 | Symbol_table::do_define_as_constant( |
ead1e424 | 1717 | const char* name, |
14b31740 | 1718 | const char* version, |
ead1e424 ILT |
1719 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
1720 | typename elfcpp::Elf_types<size>::Elf_WXword symsize, | |
1721 | elfcpp::STT type, | |
1722 | elfcpp::STB binding, | |
1723 | elfcpp::STV visibility, | |
1724 | unsigned char nonvis, | |
caa9d5d9 ILT |
1725 | bool only_if_ref, |
1726 | bool force_override) | |
ead1e424 ILT |
1727 | { |
1728 | Sized_symbol<size>* sym; | |
86f2e683 | 1729 | Sized_symbol<size>* oldsym; |
ead1e424 | 1730 | |
8851ecca | 1731 | if (parameters->target().is_big_endian()) |
9025d29d ILT |
1732 | { |
1733 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
7d1a9ebb ILT |
1734 | sym = this->define_special_symbol<size, true>(&name, &version, |
1735 | only_if_ref, &oldsym); | |
9025d29d ILT |
1736 | #else |
1737 | gold_unreachable(); | |
1738 | #endif | |
1739 | } | |
ead1e424 | 1740 | else |
9025d29d ILT |
1741 | { |
1742 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
7d1a9ebb ILT |
1743 | sym = this->define_special_symbol<size, false>(&name, &version, |
1744 | only_if_ref, &oldsym); | |
9025d29d ILT |
1745 | #else |
1746 | gold_unreachable(); | |
1747 | #endif | |
1748 | } | |
ead1e424 ILT |
1749 | |
1750 | if (sym == NULL) | |
14b31740 | 1751 | return NULL; |
ead1e424 | 1752 | |
75517b77 ILT |
1753 | sym->init_constant(name, version, value, symsize, type, binding, visibility, |
1754 | nonvis); | |
14b31740 | 1755 | |
e5756efb | 1756 | if (oldsym == NULL) |
55a93433 | 1757 | { |
686c8caf ILT |
1758 | // Version symbols are absolute symbols with name == version. |
1759 | // We don't want to force them to be local. | |
1760 | if ((version == NULL | |
1761 | || name != version | |
1762 | || value != 0) | |
1763 | && (binding == elfcpp::STB_LOCAL | |
1764 | || this->version_script_.symbol_is_local(name))) | |
55a93433 | 1765 | this->force_local(sym); |
75517b77 ILT |
1766 | else if (version != NULL |
1767 | && (name != version || value != 0)) | |
1768 | sym->set_is_default(); | |
55a93433 ILT |
1769 | return sym; |
1770 | } | |
86f2e683 | 1771 | |
caa9d5d9 | 1772 | if (force_override || Symbol_table::should_override_with_special(oldsym)) |
e5756efb ILT |
1773 | this->override_with_special(oldsym, sym); |
1774 | delete sym; | |
1775 | return oldsym; | |
ead1e424 ILT |
1776 | } |
1777 | ||
1778 | // Define a set of symbols in output sections. | |
1779 | ||
1780 | void | |
9b07f471 | 1781 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1782 | const Define_symbol_in_section* p, |
1783 | bool only_if_ref) | |
ead1e424 ILT |
1784 | { |
1785 | for (int i = 0; i < count; ++i, ++p) | |
1786 | { | |
1787 | Output_section* os = layout->find_output_section(p->output_section); | |
1788 | if (os != NULL) | |
9b07f471 | 1789 | this->define_in_output_data(p->name, NULL, os, p->value, |
14b31740 ILT |
1790 | p->size, p->type, p->binding, |
1791 | p->visibility, p->nonvis, | |
a445fddf ILT |
1792 | p->offset_is_from_end, |
1793 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1794 | else |
9b07f471 | 1795 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1796 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1797 | only_if_ref || p->only_if_ref, |
1798 | false); | |
ead1e424 ILT |
1799 | } |
1800 | } | |
1801 | ||
1802 | // Define a set of symbols in output segments. | |
1803 | ||
1804 | void | |
9b07f471 | 1805 | Symbol_table::define_symbols(const Layout* layout, int count, |
a445fddf ILT |
1806 | const Define_symbol_in_segment* p, |
1807 | bool only_if_ref) | |
ead1e424 ILT |
1808 | { |
1809 | for (int i = 0; i < count; ++i, ++p) | |
1810 | { | |
1811 | Output_segment* os = layout->find_output_segment(p->segment_type, | |
1812 | p->segment_flags_set, | |
1813 | p->segment_flags_clear); | |
1814 | if (os != NULL) | |
9b07f471 | 1815 | this->define_in_output_segment(p->name, NULL, os, p->value, |
14b31740 ILT |
1816 | p->size, p->type, p->binding, |
1817 | p->visibility, p->nonvis, | |
a445fddf ILT |
1818 | p->offset_base, |
1819 | only_if_ref || p->only_if_ref); | |
ead1e424 | 1820 | else |
9b07f471 | 1821 | this->define_as_constant(p->name, NULL, 0, p->size, p->type, |
ead1e424 | 1822 | p->binding, p->visibility, p->nonvis, |
caa9d5d9 ILT |
1823 | only_if_ref || p->only_if_ref, |
1824 | false); | |
ead1e424 ILT |
1825 | } |
1826 | } | |
1827 | ||
46fe1623 ILT |
1828 | // Define CSYM using a COPY reloc. POSD is the Output_data where the |
1829 | // symbol should be defined--typically a .dyn.bss section. VALUE is | |
1830 | // the offset within POSD. | |
1831 | ||
1832 | template<int size> | |
1833 | void | |
fe8718a4 | 1834 | Symbol_table::define_with_copy_reloc( |
fe8718a4 ILT |
1835 | Sized_symbol<size>* csym, |
1836 | Output_data* posd, | |
1837 | typename elfcpp::Elf_types<size>::Elf_Addr value) | |
46fe1623 ILT |
1838 | { |
1839 | gold_assert(csym->is_from_dynobj()); | |
1840 | gold_assert(!csym->is_copied_from_dynobj()); | |
1841 | Object* object = csym->object(); | |
1842 | gold_assert(object->is_dynamic()); | |
1843 | Dynobj* dynobj = static_cast<Dynobj*>(object); | |
1844 | ||
1845 | // Our copied variable has to override any variable in a shared | |
1846 | // library. | |
1847 | elfcpp::STB binding = csym->binding(); | |
1848 | if (binding == elfcpp::STB_WEAK) | |
1849 | binding = elfcpp::STB_GLOBAL; | |
1850 | ||
9b07f471 | 1851 | this->define_in_output_data(csym->name(), csym->version(), |
46fe1623 ILT |
1852 | posd, value, csym->symsize(), |
1853 | csym->type(), binding, | |
1854 | csym->visibility(), csym->nonvis(), | |
1855 | false, false); | |
1856 | ||
1857 | csym->set_is_copied_from_dynobj(); | |
1858 | csym->set_needs_dynsym_entry(); | |
1859 | ||
1860 | this->copied_symbol_dynobjs_[csym] = dynobj; | |
1861 | ||
1862 | // We have now defined all aliases, but we have not entered them all | |
1863 | // in the copied_symbol_dynobjs_ map. | |
1864 | if (csym->has_alias()) | |
1865 | { | |
1866 | Symbol* sym = csym; | |
1867 | while (true) | |
1868 | { | |
1869 | sym = this->weak_aliases_[sym]; | |
1870 | if (sym == csym) | |
1871 | break; | |
1872 | gold_assert(sym->output_data() == posd); | |
1873 | ||
1874 | sym->set_is_copied_from_dynobj(); | |
1875 | this->copied_symbol_dynobjs_[sym] = dynobj; | |
1876 | } | |
1877 | } | |
1878 | } | |
1879 | ||
1880 | // SYM is defined using a COPY reloc. Return the dynamic object where | |
1881 | // the original definition was found. | |
1882 | ||
1883 | Dynobj* | |
1884 | Symbol_table::get_copy_source(const Symbol* sym) const | |
1885 | { | |
1886 | gold_assert(sym->is_copied_from_dynobj()); | |
1887 | Copied_symbol_dynobjs::const_iterator p = | |
1888 | this->copied_symbol_dynobjs_.find(sym); | |
1889 | gold_assert(p != this->copied_symbol_dynobjs_.end()); | |
1890 | return p->second; | |
1891 | } | |
1892 | ||
f3e9c5c5 ILT |
1893 | // Add any undefined symbols named on the command line. |
1894 | ||
1895 | void | |
1896 | Symbol_table::add_undefined_symbols_from_command_line() | |
1897 | { | |
1898 | if (parameters->options().any_undefined()) | |
1899 | { | |
1900 | if (parameters->target().get_size() == 32) | |
1901 | { | |
5adf9721 | 1902 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
f3e9c5c5 ILT |
1903 | this->do_add_undefined_symbols_from_command_line<32>(); |
1904 | #else | |
1905 | gold_unreachable(); | |
1906 | #endif | |
1907 | } | |
1908 | else if (parameters->target().get_size() == 64) | |
1909 | { | |
1910 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1911 | this->do_add_undefined_symbols_from_command_line<64>(); | |
1912 | #else | |
1913 | gold_unreachable(); | |
1914 | #endif | |
1915 | } | |
1916 | else | |
1917 | gold_unreachable(); | |
1918 | } | |
1919 | } | |
1920 | ||
1921 | template<int size> | |
1922 | void | |
1923 | Symbol_table::do_add_undefined_symbols_from_command_line() | |
1924 | { | |
1925 | for (options::String_set::const_iterator p = | |
1926 | parameters->options().undefined_begin(); | |
1927 | p != parameters->options().undefined_end(); | |
1928 | ++p) | |
1929 | { | |
1930 | const char* name = p->c_str(); | |
1931 | ||
1932 | if (this->lookup(name) != NULL) | |
1933 | continue; | |
1934 | ||
1935 | const char* version = NULL; | |
1936 | ||
1937 | Sized_symbol<size>* sym; | |
1938 | Sized_symbol<size>* oldsym; | |
1939 | if (parameters->target().is_big_endian()) | |
1940 | { | |
1941 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG) | |
1942 | sym = this->define_special_symbol<size, true>(&name, &version, | |
1943 | false, &oldsym); | |
1944 | #else | |
1945 | gold_unreachable(); | |
1946 | #endif | |
1947 | } | |
1948 | else | |
1949 | { | |
1950 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE) | |
1951 | sym = this->define_special_symbol<size, false>(&name, &version, | |
1952 | false, &oldsym); | |
1953 | #else | |
1954 | gold_unreachable(); | |
1955 | #endif | |
1956 | } | |
1957 | ||
1958 | gold_assert(oldsym == NULL); | |
1959 | ||
75517b77 | 1960 | sym->init_undefined(name, version, elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
f3e9c5c5 ILT |
1961 | elfcpp::STV_DEFAULT, 0); |
1962 | ++this->saw_undefined_; | |
1963 | } | |
1964 | } | |
1965 | ||
a3ad94ed ILT |
1966 | // Set the dynamic symbol indexes. INDEX is the index of the first |
1967 | // global dynamic symbol. Pointers to the symbols are stored into the | |
1968 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
1969 | // updated dynamic symbol index. | |
1970 | ||
1971 | unsigned int | |
9b07f471 | 1972 | Symbol_table::set_dynsym_indexes(unsigned int index, |
a3ad94ed | 1973 | std::vector<Symbol*>* syms, |
14b31740 ILT |
1974 | Stringpool* dynpool, |
1975 | Versions* versions) | |
a3ad94ed ILT |
1976 | { |
1977 | for (Symbol_table_type::iterator p = this->table_.begin(); | |
1978 | p != this->table_.end(); | |
1979 | ++p) | |
1980 | { | |
1981 | Symbol* sym = p->second; | |
16649710 ILT |
1982 | |
1983 | // Note that SYM may already have a dynamic symbol index, since | |
1984 | // some symbols appear more than once in the symbol table, with | |
1985 | // and without a version. | |
1986 | ||
436ca963 | 1987 | if (!sym->should_add_dynsym_entry()) |
16649710 ILT |
1988 | sym->set_dynsym_index(-1U); |
1989 | else if (!sym->has_dynsym_index()) | |
a3ad94ed ILT |
1990 | { |
1991 | sym->set_dynsym_index(index); | |
1992 | ++index; | |
1993 | syms->push_back(sym); | |
cfd73a4e | 1994 | dynpool->add(sym->name(), false, NULL); |
14b31740 ILT |
1995 | |
1996 | // Record any version information. | |
09124467 ILT |
1997 | if (sym->version() != NULL) |
1998 | versions->record_version(this, dynpool, sym); | |
a3ad94ed ILT |
1999 | } |
2000 | } | |
2001 | ||
14b31740 ILT |
2002 | // Finish up the versions. In some cases this may add new dynamic |
2003 | // symbols. | |
9b07f471 | 2004 | index = versions->finalize(this, index, syms); |
14b31740 | 2005 | |
a3ad94ed ILT |
2006 | return index; |
2007 | } | |
2008 | ||
c06b7b0b | 2009 | // Set the final values for all the symbols. The index of the first |
55a93433 ILT |
2010 | // global symbol in the output file is *PLOCAL_SYMCOUNT. Record the |
2011 | // file offset OFF. Add their names to POOL. Return the new file | |
2012 | // offset. Update *PLOCAL_SYMCOUNT if necessary. | |
54dc6425 | 2013 | |
75f65a3e | 2014 | off_t |
55a93433 ILT |
2015 | Symbol_table::finalize(off_t off, off_t dynoff, size_t dyn_global_index, |
2016 | size_t dyncount, Stringpool* pool, | |
2017 | unsigned int *plocal_symcount) | |
54dc6425 | 2018 | { |
f6ce93d6 ILT |
2019 | off_t ret; |
2020 | ||
55a93433 ILT |
2021 | gold_assert(*plocal_symcount != 0); |
2022 | this->first_global_index_ = *plocal_symcount; | |
c06b7b0b | 2023 | |
16649710 ILT |
2024 | this->dynamic_offset_ = dynoff; |
2025 | this->first_dynamic_global_index_ = dyn_global_index; | |
2026 | this->dynamic_count_ = dyncount; | |
2027 | ||
8851ecca | 2028 | if (parameters->target().get_size() == 32) |
9025d29d ILT |
2029 | { |
2030 | #if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_32_LITTLE) | |
55a93433 | 2031 | ret = this->sized_finalize<32>(off, pool, plocal_symcount); |
9025d29d ILT |
2032 | #else |
2033 | gold_unreachable(); | |
2034 | #endif | |
2035 | } | |
8851ecca | 2036 | else if (parameters->target().get_size() == 64) |
9025d29d ILT |
2037 | { |
2038 | #if defined(HAVE_TARGET_64_BIG) || defined(HAVE_TARGET_64_LITTLE) | |
55a93433 | 2039 | ret = this->sized_finalize<64>(off, pool, plocal_symcount); |
9025d29d ILT |
2040 | #else |
2041 | gold_unreachable(); | |
2042 | #endif | |
2043 | } | |
61ba1cf9 | 2044 | else |
a3ad94ed | 2045 | gold_unreachable(); |
f6ce93d6 ILT |
2046 | |
2047 | // Now that we have the final symbol table, we can reliably note | |
2048 | // which symbols should get warnings. | |
cb295612 | 2049 | this->warnings_.note_warnings(this); |
f6ce93d6 ILT |
2050 | |
2051 | return ret; | |
75f65a3e ILT |
2052 | } |
2053 | ||
55a93433 ILT |
2054 | // SYM is going into the symbol table at *PINDEX. Add the name to |
2055 | // POOL, update *PINDEX and *POFF. | |
2056 | ||
2057 | template<int size> | |
2058 | void | |
2059 | Symbol_table::add_to_final_symtab(Symbol* sym, Stringpool* pool, | |
2060 | unsigned int* pindex, off_t* poff) | |
2061 | { | |
2062 | sym->set_symtab_index(*pindex); | |
2063 | pool->add(sym->name(), false, NULL); | |
2064 | ++*pindex; | |
2065 | *poff += elfcpp::Elf_sizes<size>::sym_size; | |
2066 | } | |
2067 | ||
ead1e424 ILT |
2068 | // Set the final value for all the symbols. This is called after |
2069 | // Layout::finalize, so all the output sections have their final | |
2070 | // address. | |
75f65a3e ILT |
2071 | |
2072 | template<int size> | |
2073 | off_t | |
55a93433 ILT |
2074 | Symbol_table::sized_finalize(off_t off, Stringpool* pool, |
2075 | unsigned int* plocal_symcount) | |
75f65a3e | 2076 | { |
ead1e424 | 2077 | off = align_address(off, size >> 3); |
75f65a3e ILT |
2078 | this->offset_ = off; |
2079 | ||
55a93433 ILT |
2080 | unsigned int index = *plocal_symcount; |
2081 | const unsigned int orig_index = index; | |
c06b7b0b | 2082 | |
55a93433 ILT |
2083 | // First do all the symbols which have been forced to be local, as |
2084 | // they must appear before all global symbols. | |
2085 | for (Forced_locals::iterator p = this->forced_locals_.begin(); | |
2086 | p != this->forced_locals_.end(); | |
2087 | ++p) | |
2088 | { | |
2089 | Symbol* sym = *p; | |
2090 | gold_assert(sym->is_forced_local()); | |
2091 | if (this->sized_finalize_symbol<size>(sym)) | |
2092 | { | |
2093 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2094 | ++*plocal_symcount; | |
2095 | } | |
2096 | } | |
2097 | ||
2098 | // Now do all the remaining symbols. | |
c06b7b0b ILT |
2099 | for (Symbol_table_type::iterator p = this->table_.begin(); |
2100 | p != this->table_.end(); | |
2101 | ++p) | |
54dc6425 | 2102 | { |
55a93433 ILT |
2103 | Symbol* sym = p->second; |
2104 | if (this->sized_finalize_symbol<size>(sym)) | |
2105 | this->add_to_final_symtab<size>(sym, pool, &index, &off); | |
2106 | } | |
54dc6425 | 2107 | |
55a93433 | 2108 | this->output_count_ = index - orig_index; |
a3ad94ed | 2109 | |
55a93433 ILT |
2110 | return off; |
2111 | } | |
75f65a3e | 2112 | |
55a93433 ILT |
2113 | // Finalize the symbol SYM. This returns true if the symbol should be |
2114 | // added to the symbol table, false otherwise. | |
008db82e | 2115 | |
55a93433 ILT |
2116 | template<int size> |
2117 | bool | |
2118 | Symbol_table::sized_finalize_symbol(Symbol* unsized_sym) | |
2119 | { | |
ef9beddf ILT |
2120 | typedef typename Sized_symbol<size>::Value_type Value_type; |
2121 | ||
55a93433 | 2122 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(unsized_sym); |
75f65a3e | 2123 | |
55a93433 ILT |
2124 | // The default version of a symbol may appear twice in the symbol |
2125 | // table. We only need to finalize it once. | |
2126 | if (sym->has_symtab_index()) | |
2127 | return false; | |
ead1e424 | 2128 | |
55a93433 ILT |
2129 | if (!sym->in_reg()) |
2130 | { | |
2131 | gold_assert(!sym->has_symtab_index()); | |
2132 | sym->set_symtab_index(-1U); | |
2133 | gold_assert(sym->dynsym_index() == -1U); | |
2134 | return false; | |
2135 | } | |
ead1e424 | 2136 | |
ef9beddf | 2137 | Value_type value; |
ead1e424 | 2138 | |
55a93433 ILT |
2139 | switch (sym->source()) |
2140 | { | |
2141 | case Symbol::FROM_OBJECT: | |
2142 | { | |
d491d34e ILT |
2143 | bool is_ordinary; |
2144 | unsigned int shndx = sym->shndx(&is_ordinary); | |
ead1e424 | 2145 | |
55a93433 | 2146 | // FIXME: We need some target specific support here. |
d491d34e | 2147 | if (!is_ordinary |
0dfbdef4 ILT |
2148 | && shndx != elfcpp::SHN_ABS |
2149 | && shndx != elfcpp::SHN_COMMON) | |
55a93433 ILT |
2150 | { |
2151 | gold_error(_("%s: unsupported symbol section 0x%x"), | |
2152 | sym->demangled_name().c_str(), shndx); | |
2153 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2154 | } |
ead1e424 | 2155 | |
55a93433 ILT |
2156 | Object* symobj = sym->object(); |
2157 | if (symobj->is_dynamic()) | |
ead1e424 | 2158 | { |
55a93433 ILT |
2159 | value = 0; |
2160 | shndx = elfcpp::SHN_UNDEF; | |
ead1e424 | 2161 | } |
89fc3421 CC |
2162 | else if (symobj->pluginobj() != NULL) |
2163 | { | |
2164 | value = 0; | |
2165 | shndx = elfcpp::SHN_UNDEF; | |
2166 | } | |
55a93433 ILT |
2167 | else if (shndx == elfcpp::SHN_UNDEF) |
2168 | value = 0; | |
d491d34e ILT |
2169 | else if (!is_ordinary |
2170 | && (shndx == elfcpp::SHN_ABS || shndx == elfcpp::SHN_COMMON)) | |
55a93433 ILT |
2171 | value = sym->value(); |
2172 | else | |
ead1e424 | 2173 | { |
55a93433 | 2174 | Relobj* relobj = static_cast<Relobj*>(symobj); |
ef9beddf | 2175 | Output_section* os = relobj->output_section(shndx); |
55a93433 ILT |
2176 | |
2177 | if (os == NULL) | |
ead1e424 | 2178 | { |
55a93433 ILT |
2179 | sym->set_symtab_index(-1U); |
2180 | gold_assert(sym->dynsym_index() == -1U); | |
2181 | return false; | |
ead1e424 | 2182 | } |
55a93433 | 2183 | |
ef9beddf | 2184 | uint64_t secoff64 = relobj->output_section_offset(shndx); |
eff45813 CC |
2185 | if (secoff64 == -1ULL) |
2186 | { | |
2187 | // The section needs special handling (e.g., a merge section). | |
2188 | value = os->output_address(relobj, shndx, sym->value()); | |
2189 | } | |
2190 | else | |
2191 | { | |
2192 | Value_type secoff = | |
2193 | convert_types<Value_type, uint64_t>(secoff64); | |
2194 | if (sym->type() == elfcpp::STT_TLS) | |
2195 | value = sym->value() + os->tls_offset() + secoff; | |
2196 | else | |
2197 | value = sym->value() + os->address() + secoff; | |
2198 | } | |
ead1e424 | 2199 | } |
55a93433 ILT |
2200 | } |
2201 | break; | |
2202 | ||
2203 | case Symbol::IN_OUTPUT_DATA: | |
2204 | { | |
2205 | Output_data* od = sym->output_data(); | |
155a0dd7 ILT |
2206 | value = sym->value(); |
2207 | if (sym->type() != elfcpp::STT_TLS) | |
2208 | value += od->address(); | |
2209 | else | |
2210 | { | |
2211 | Output_section* os = od->output_section(); | |
2212 | gold_assert(os != NULL); | |
2213 | value += os->tls_offset() + (od->address() - os->address()); | |
2214 | } | |
55a93433 ILT |
2215 | if (sym->offset_is_from_end()) |
2216 | value += od->data_size(); | |
2217 | } | |
2218 | break; | |
2219 | ||
2220 | case Symbol::IN_OUTPUT_SEGMENT: | |
2221 | { | |
2222 | Output_segment* os = sym->output_segment(); | |
edfbb029 CC |
2223 | value = sym->value(); |
2224 | if (sym->type() != elfcpp::STT_TLS) | |
2225 | value += os->vaddr(); | |
55a93433 ILT |
2226 | switch (sym->offset_base()) |
2227 | { | |
2228 | case Symbol::SEGMENT_START: | |
2229 | break; | |
2230 | case Symbol::SEGMENT_END: | |
2231 | value += os->memsz(); | |
2232 | break; | |
2233 | case Symbol::SEGMENT_BSS: | |
2234 | value += os->filesz(); | |
2235 | break; | |
2236 | default: | |
2237 | gold_unreachable(); | |
2238 | } | |
2239 | } | |
2240 | break; | |
ead1e424 | 2241 | |
f3e9c5c5 | 2242 | case Symbol::IS_CONSTANT: |
55a93433 ILT |
2243 | value = sym->value(); |
2244 | break; | |
ead1e424 | 2245 | |
f3e9c5c5 ILT |
2246 | case Symbol::IS_UNDEFINED: |
2247 | value = 0; | |
2248 | break; | |
2249 | ||
55a93433 ILT |
2250 | default: |
2251 | gold_unreachable(); | |
2252 | } | |
ead1e424 | 2253 | |
55a93433 | 2254 | sym->set_value(value); |
9e2dcb77 | 2255 | |
8851ecca | 2256 | if (parameters->options().strip_all()) |
55a93433 ILT |
2257 | { |
2258 | sym->set_symtab_index(-1U); | |
2259 | return false; | |
54dc6425 | 2260 | } |
75f65a3e | 2261 | |
55a93433 | 2262 | return true; |
54dc6425 ILT |
2263 | } |
2264 | ||
61ba1cf9 ILT |
2265 | // Write out the global symbols. |
2266 | ||
2267 | void | |
9a2d6984 ILT |
2268 | Symbol_table::write_globals(const Input_objects* input_objects, |
2269 | const Stringpool* sympool, | |
d491d34e ILT |
2270 | const Stringpool* dynpool, |
2271 | Output_symtab_xindex* symtab_xindex, | |
2272 | Output_symtab_xindex* dynsym_xindex, | |
2273 | Output_file* of) const | |
61ba1cf9 | 2274 | { |
8851ecca | 2275 | switch (parameters->size_and_endianness()) |
61ba1cf9 | 2276 | { |
9025d29d | 2277 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca ILT |
2278 | case Parameters::TARGET_32_LITTLE: |
2279 | this->sized_write_globals<32, false>(input_objects, sympool, | |
d491d34e ILT |
2280 | dynpool, symtab_xindex, |
2281 | dynsym_xindex, of); | |
8851ecca | 2282 | break; |
9025d29d | 2283 | #endif |
8851ecca ILT |
2284 | #ifdef HAVE_TARGET_32_BIG |
2285 | case Parameters::TARGET_32_BIG: | |
2286 | this->sized_write_globals<32, true>(input_objects, sympool, | |
d491d34e ILT |
2287 | dynpool, symtab_xindex, |
2288 | dynsym_xindex, of); | |
8851ecca | 2289 | break; |
9025d29d | 2290 | #endif |
9025d29d | 2291 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca ILT |
2292 | case Parameters::TARGET_64_LITTLE: |
2293 | this->sized_write_globals<64, false>(input_objects, sympool, | |
d491d34e ILT |
2294 | dynpool, symtab_xindex, |
2295 | dynsym_xindex, of); | |
8851ecca | 2296 | break; |
9025d29d | 2297 | #endif |
8851ecca ILT |
2298 | #ifdef HAVE_TARGET_64_BIG |
2299 | case Parameters::TARGET_64_BIG: | |
2300 | this->sized_write_globals<64, true>(input_objects, sympool, | |
d491d34e ILT |
2301 | dynpool, symtab_xindex, |
2302 | dynsym_xindex, of); | |
8851ecca ILT |
2303 | break; |
2304 | #endif | |
2305 | default: | |
2306 | gold_unreachable(); | |
61ba1cf9 | 2307 | } |
61ba1cf9 ILT |
2308 | } |
2309 | ||
2310 | // Write out the global symbols. | |
2311 | ||
2312 | template<int size, bool big_endian> | |
2313 | void | |
9a2d6984 | 2314 | Symbol_table::sized_write_globals(const Input_objects* input_objects, |
61ba1cf9 | 2315 | const Stringpool* sympool, |
16649710 | 2316 | const Stringpool* dynpool, |
d491d34e ILT |
2317 | Output_symtab_xindex* symtab_xindex, |
2318 | Output_symtab_xindex* dynsym_xindex, | |
61ba1cf9 ILT |
2319 | Output_file* of) const |
2320 | { | |
8851ecca | 2321 | const Target& target = parameters->target(); |
9a2d6984 | 2322 | |
61ba1cf9 | 2323 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
55a93433 ILT |
2324 | |
2325 | const unsigned int output_count = this->output_count_; | |
2326 | const section_size_type oview_size = output_count * sym_size; | |
2327 | const unsigned int first_global_index = this->first_global_index_; | |
5fe2a0f5 ILT |
2328 | unsigned char* psyms; |
2329 | if (this->offset_ == 0 || output_count == 0) | |
2330 | psyms = NULL; | |
2331 | else | |
2332 | psyms = of->get_output_view(this->offset_, oview_size); | |
16649710 | 2333 | |
55a93433 ILT |
2334 | const unsigned int dynamic_count = this->dynamic_count_; |
2335 | const section_size_type dynamic_size = dynamic_count * sym_size; | |
2336 | const unsigned int first_dynamic_global_index = | |
2337 | this->first_dynamic_global_index_; | |
16649710 | 2338 | unsigned char* dynamic_view; |
5fe2a0f5 | 2339 | if (this->dynamic_offset_ == 0 || dynamic_count == 0) |
16649710 ILT |
2340 | dynamic_view = NULL; |
2341 | else | |
2342 | dynamic_view = of->get_output_view(this->dynamic_offset_, dynamic_size); | |
c06b7b0b | 2343 | |
61ba1cf9 ILT |
2344 | for (Symbol_table_type::const_iterator p = this->table_.begin(); |
2345 | p != this->table_.end(); | |
2346 | ++p) | |
2347 | { | |
2348 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(p->second); | |
2349 | ||
9a2d6984 ILT |
2350 | // Possibly warn about unresolved symbols in shared libraries. |
2351 | this->warn_about_undefined_dynobj_symbol(input_objects, sym); | |
e2827e5f | 2352 | |
a3ad94ed | 2353 | unsigned int sym_index = sym->symtab_index(); |
16649710 ILT |
2354 | unsigned int dynsym_index; |
2355 | if (dynamic_view == NULL) | |
2356 | dynsym_index = -1U; | |
2357 | else | |
2358 | dynsym_index = sym->dynsym_index(); | |
2359 | ||
2360 | if (sym_index == -1U && dynsym_index == -1U) | |
a3ad94ed ILT |
2361 | { |
2362 | // This symbol is not included in the output file. | |
2363 | continue; | |
2364 | } | |
16649710 | 2365 | |
ead1e424 | 2366 | unsigned int shndx; |
88dd47ac ILT |
2367 | typename elfcpp::Elf_types<size>::Elf_Addr sym_value = sym->value(); |
2368 | typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value; | |
ead1e424 ILT |
2369 | switch (sym->source()) |
2370 | { | |
2371 | case Symbol::FROM_OBJECT: | |
2372 | { | |
d491d34e ILT |
2373 | bool is_ordinary; |
2374 | unsigned int in_shndx = sym->shndx(&is_ordinary); | |
ead1e424 ILT |
2375 | |
2376 | // FIXME: We need some target specific support here. | |
d491d34e | 2377 | if (!is_ordinary |
0dfbdef4 ILT |
2378 | && in_shndx != elfcpp::SHN_ABS |
2379 | && in_shndx != elfcpp::SHN_COMMON) | |
ead1e424 | 2380 | { |
75f2446e | 2381 | gold_error(_("%s: unsupported symbol section 0x%x"), |
a2b1aa12 | 2382 | sym->demangled_name().c_str(), in_shndx); |
75f2446e | 2383 | shndx = in_shndx; |
f6ce93d6 | 2384 | } |
ead1e424 ILT |
2385 | else |
2386 | { | |
75f2446e ILT |
2387 | Object* symobj = sym->object(); |
2388 | if (symobj->is_dynamic()) | |
2389 | { | |
2390 | if (sym->needs_dynsym_value()) | |
8851ecca | 2391 | dynsym_value = target.dynsym_value(sym); |
75f2446e ILT |
2392 | shndx = elfcpp::SHN_UNDEF; |
2393 | } | |
89fc3421 CC |
2394 | else if (symobj->pluginobj() != NULL) |
2395 | shndx = elfcpp::SHN_UNDEF; | |
75f2446e | 2396 | else if (in_shndx == elfcpp::SHN_UNDEF |
d491d34e ILT |
2397 | || (!is_ordinary |
2398 | && (in_shndx == elfcpp::SHN_ABS | |
2399 | || in_shndx == elfcpp::SHN_COMMON))) | |
75f2446e ILT |
2400 | shndx = in_shndx; |
2401 | else | |
2402 | { | |
2403 | Relobj* relobj = static_cast<Relobj*>(symobj); | |
ef9beddf | 2404 | Output_section* os = relobj->output_section(in_shndx); |
75f2446e ILT |
2405 | gold_assert(os != NULL); |
2406 | shndx = os->out_shndx(); | |
88dd47ac | 2407 | |
d491d34e ILT |
2408 | if (shndx >= elfcpp::SHN_LORESERVE) |
2409 | { | |
2410 | if (sym_index != -1U) | |
2411 | symtab_xindex->add(sym_index, shndx); | |
2412 | if (dynsym_index != -1U) | |
2413 | dynsym_xindex->add(dynsym_index, shndx); | |
2414 | shndx = elfcpp::SHN_XINDEX; | |
2415 | } | |
2416 | ||
88dd47ac ILT |
2417 | // In object files symbol values are section |
2418 | // relative. | |
8851ecca | 2419 | if (parameters->options().relocatable()) |
88dd47ac | 2420 | sym_value -= os->address(); |
75f2446e | 2421 | } |
ead1e424 ILT |
2422 | } |
2423 | } | |
2424 | break; | |
2425 | ||
2426 | case Symbol::IN_OUTPUT_DATA: | |
2427 | shndx = sym->output_data()->out_shndx(); | |
d491d34e ILT |
2428 | if (shndx >= elfcpp::SHN_LORESERVE) |
2429 | { | |
2430 | if (sym_index != -1U) | |
2431 | symtab_xindex->add(sym_index, shndx); | |
2432 | if (dynsym_index != -1U) | |
2433 | dynsym_xindex->add(dynsym_index, shndx); | |
2434 | shndx = elfcpp::SHN_XINDEX; | |
2435 | } | |
ead1e424 ILT |
2436 | break; |
2437 | ||
2438 | case Symbol::IN_OUTPUT_SEGMENT: | |
2439 | shndx = elfcpp::SHN_ABS; | |
2440 | break; | |
2441 | ||
f3e9c5c5 | 2442 | case Symbol::IS_CONSTANT: |
ead1e424 ILT |
2443 | shndx = elfcpp::SHN_ABS; |
2444 | break; | |
2445 | ||
f3e9c5c5 ILT |
2446 | case Symbol::IS_UNDEFINED: |
2447 | shndx = elfcpp::SHN_UNDEF; | |
2448 | break; | |
2449 | ||
ead1e424 | 2450 | default: |
a3ad94ed | 2451 | gold_unreachable(); |
ead1e424 | 2452 | } |
61ba1cf9 | 2453 | |
16649710 ILT |
2454 | if (sym_index != -1U) |
2455 | { | |
55a93433 ILT |
2456 | sym_index -= first_global_index; |
2457 | gold_assert(sym_index < output_count); | |
2458 | unsigned char* ps = psyms + (sym_index * sym_size); | |
7d1a9ebb ILT |
2459 | this->sized_write_symbol<size, big_endian>(sym, sym_value, shndx, |
2460 | sympool, ps); | |
16649710 | 2461 | } |
61ba1cf9 | 2462 | |
16649710 ILT |
2463 | if (dynsym_index != -1U) |
2464 | { | |
2465 | dynsym_index -= first_dynamic_global_index; | |
2466 | gold_assert(dynsym_index < dynamic_count); | |
2467 | unsigned char* pd = dynamic_view + (dynsym_index * sym_size); | |
7d1a9ebb ILT |
2468 | this->sized_write_symbol<size, big_endian>(sym, dynsym_value, shndx, |
2469 | dynpool, pd); | |
16649710 | 2470 | } |
61ba1cf9 ILT |
2471 | } |
2472 | ||
c06b7b0b | 2473 | of->write_output_view(this->offset_, oview_size, psyms); |
16649710 ILT |
2474 | if (dynamic_view != NULL) |
2475 | of->write_output_view(this->dynamic_offset_, dynamic_size, dynamic_view); | |
2476 | } | |
2477 | ||
2478 | // Write out the symbol SYM, in section SHNDX, to P. POOL is the | |
2479 | // strtab holding the name. | |
2480 | ||
2481 | template<int size, bool big_endian> | |
2482 | void | |
ab5c9e90 ILT |
2483 | Symbol_table::sized_write_symbol( |
2484 | Sized_symbol<size>* sym, | |
2485 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2486 | unsigned int shndx, | |
2487 | const Stringpool* pool, | |
7d1a9ebb | 2488 | unsigned char* p) const |
16649710 ILT |
2489 | { |
2490 | elfcpp::Sym_write<size, big_endian> osym(p); | |
2491 | osym.put_st_name(pool->get_offset(sym->name())); | |
ab5c9e90 | 2492 | osym.put_st_value(value); |
58e54ac2 CD |
2493 | // Use a symbol size of zero for undefined symbols from shared libraries. |
2494 | if (shndx == elfcpp::SHN_UNDEF && sym->is_from_dynobj()) | |
2495 | osym.put_st_size(0); | |
2496 | else | |
2497 | osym.put_st_size(sym->symsize()); | |
55a93433 ILT |
2498 | // A version script may have overridden the default binding. |
2499 | if (sym->is_forced_local()) | |
2500 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, sym->type())); | |
2501 | else | |
2502 | osym.put_st_info(elfcpp::elf_st_info(sym->binding(), sym->type())); | |
16649710 ILT |
2503 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), sym->nonvis())); |
2504 | osym.put_st_shndx(shndx); | |
61ba1cf9 ILT |
2505 | } |
2506 | ||
9a2d6984 ILT |
2507 | // Check for unresolved symbols in shared libraries. This is |
2508 | // controlled by the --allow-shlib-undefined option. | |
2509 | ||
2510 | // We only warn about libraries for which we have seen all the | |
2511 | // DT_NEEDED entries. We don't try to track down DT_NEEDED entries | |
2512 | // which were not seen in this link. If we didn't see a DT_NEEDED | |
2513 | // entry, we aren't going to be able to reliably report whether the | |
2514 | // symbol is undefined. | |
2515 | ||
2516 | // We also don't warn about libraries found in the system library | |
2517 | // directory (the directory were we find libc.so); we assume that | |
2518 | // those libraries are OK. This heuristic avoids problems in | |
2519 | // GNU/Linux, in which -ldl can have undefined references satisfied by | |
2520 | // ld-linux.so. | |
2521 | ||
2522 | inline void | |
2523 | Symbol_table::warn_about_undefined_dynobj_symbol( | |
2524 | const Input_objects* input_objects, | |
2525 | Symbol* sym) const | |
2526 | { | |
d491d34e | 2527 | bool dummy; |
9a2d6984 ILT |
2528 | if (sym->source() == Symbol::FROM_OBJECT |
2529 | && sym->object()->is_dynamic() | |
d491d34e | 2530 | && sym->shndx(&dummy) == elfcpp::SHN_UNDEF |
9a2d6984 | 2531 | && sym->binding() != elfcpp::STB_WEAK |
8851ecca ILT |
2532 | && !parameters->options().allow_shlib_undefined() |
2533 | && !parameters->target().is_defined_by_abi(sym) | |
9a2d6984 ILT |
2534 | && !input_objects->found_in_system_library_directory(sym->object())) |
2535 | { | |
2536 | // A very ugly cast. | |
2537 | Dynobj* dynobj = static_cast<Dynobj*>(sym->object()); | |
2538 | if (!dynobj->has_unknown_needed_entries()) | |
096b02cf CS |
2539 | { |
2540 | if (sym->version()) | |
2541 | gold_error(_("%s: undefined reference to '%s', version '%s'"), | |
2542 | sym->object()->name().c_str(), | |
2543 | sym->demangled_name().c_str(), | |
2544 | sym->version()); | |
2545 | else | |
2546 | gold_error(_("%s: undefined reference to '%s'"), | |
2547 | sym->object()->name().c_str(), | |
2548 | sym->demangled_name().c_str()); | |
2549 | } | |
9a2d6984 ILT |
2550 | } |
2551 | } | |
2552 | ||
a3ad94ed ILT |
2553 | // Write out a section symbol. Return the update offset. |
2554 | ||
2555 | void | |
9025d29d | 2556 | Symbol_table::write_section_symbol(const Output_section *os, |
d491d34e | 2557 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2558 | Output_file* of, |
2559 | off_t offset) const | |
2560 | { | |
8851ecca | 2561 | switch (parameters->size_and_endianness()) |
a3ad94ed | 2562 | { |
9025d29d | 2563 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2564 | case Parameters::TARGET_32_LITTLE: |
d491d34e ILT |
2565 | this->sized_write_section_symbol<32, false>(os, symtab_xindex, of, |
2566 | offset); | |
8851ecca | 2567 | break; |
9025d29d | 2568 | #endif |
8851ecca ILT |
2569 | #ifdef HAVE_TARGET_32_BIG |
2570 | case Parameters::TARGET_32_BIG: | |
d491d34e ILT |
2571 | this->sized_write_section_symbol<32, true>(os, symtab_xindex, of, |
2572 | offset); | |
8851ecca | 2573 | break; |
9025d29d | 2574 | #endif |
9025d29d | 2575 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2576 | case Parameters::TARGET_64_LITTLE: |
d491d34e ILT |
2577 | this->sized_write_section_symbol<64, false>(os, symtab_xindex, of, |
2578 | offset); | |
8851ecca | 2579 | break; |
9025d29d | 2580 | #endif |
8851ecca ILT |
2581 | #ifdef HAVE_TARGET_64_BIG |
2582 | case Parameters::TARGET_64_BIG: | |
d491d34e ILT |
2583 | this->sized_write_section_symbol<64, true>(os, symtab_xindex, of, |
2584 | offset); | |
8851ecca ILT |
2585 | break; |
2586 | #endif | |
2587 | default: | |
2588 | gold_unreachable(); | |
a3ad94ed | 2589 | } |
a3ad94ed ILT |
2590 | } |
2591 | ||
2592 | // Write out a section symbol, specialized for size and endianness. | |
2593 | ||
2594 | template<int size, bool big_endian> | |
2595 | void | |
2596 | Symbol_table::sized_write_section_symbol(const Output_section* os, | |
d491d34e | 2597 | Output_symtab_xindex* symtab_xindex, |
a3ad94ed ILT |
2598 | Output_file* of, |
2599 | off_t offset) const | |
2600 | { | |
2601 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2602 | ||
2603 | unsigned char* pov = of->get_output_view(offset, sym_size); | |
2604 | ||
2605 | elfcpp::Sym_write<size, big_endian> osym(pov); | |
2606 | osym.put_st_name(0); | |
2607 | osym.put_st_value(os->address()); | |
2608 | osym.put_st_size(0); | |
2609 | osym.put_st_info(elfcpp::elf_st_info(elfcpp::STB_LOCAL, | |
2610 | elfcpp::STT_SECTION)); | |
2611 | osym.put_st_other(elfcpp::elf_st_other(elfcpp::STV_DEFAULT, 0)); | |
d491d34e ILT |
2612 | |
2613 | unsigned int shndx = os->out_shndx(); | |
2614 | if (shndx >= elfcpp::SHN_LORESERVE) | |
2615 | { | |
2616 | symtab_xindex->add(os->symtab_index(), shndx); | |
2617 | shndx = elfcpp::SHN_XINDEX; | |
2618 | } | |
2619 | osym.put_st_shndx(shndx); | |
a3ad94ed ILT |
2620 | |
2621 | of->write_output_view(offset, sym_size, pov); | |
2622 | } | |
2623 | ||
abaa3995 ILT |
2624 | // Print statistical information to stderr. This is used for --stats. |
2625 | ||
2626 | void | |
2627 | Symbol_table::print_stats() const | |
2628 | { | |
2629 | #if defined(HAVE_TR1_UNORDERED_MAP) || defined(HAVE_EXT_HASH_MAP) | |
2630 | fprintf(stderr, _("%s: symbol table entries: %zu; buckets: %zu\n"), | |
2631 | program_name, this->table_.size(), this->table_.bucket_count()); | |
2632 | #else | |
2633 | fprintf(stderr, _("%s: symbol table entries: %zu\n"), | |
2634 | program_name, this->table_.size()); | |
2635 | #endif | |
ad8f37d1 | 2636 | this->namepool_.print_stats("symbol table stringpool"); |
abaa3995 ILT |
2637 | } |
2638 | ||
ff541f30 ILT |
2639 | // We check for ODR violations by looking for symbols with the same |
2640 | // name for which the debugging information reports that they were | |
2641 | // defined in different source locations. When comparing the source | |
2642 | // location, we consider instances with the same base filename and | |
2643 | // line number to be the same. This is because different object | |
2644 | // files/shared libraries can include the same header file using | |
2645 | // different paths, and we don't want to report an ODR violation in | |
2646 | // that case. | |
2647 | ||
2648 | // This struct is used to compare line information, as returned by | |
7bf1f802 | 2649 | // Dwarf_line_info::one_addr2line. It implements a < comparison |
ff541f30 ILT |
2650 | // operator used with std::set. |
2651 | ||
2652 | struct Odr_violation_compare | |
2653 | { | |
2654 | bool | |
2655 | operator()(const std::string& s1, const std::string& s2) const | |
2656 | { | |
2657 | std::string::size_type pos1 = s1.rfind('/'); | |
2658 | std::string::size_type pos2 = s2.rfind('/'); | |
2659 | if (pos1 == std::string::npos | |
2660 | || pos2 == std::string::npos) | |
2661 | return s1 < s2; | |
2662 | return s1.compare(pos1, std::string::npos, | |
2663 | s2, pos2, std::string::npos) < 0; | |
2664 | } | |
2665 | }; | |
2666 | ||
70e654ba ILT |
2667 | // Check candidate_odr_violations_ to find symbols with the same name |
2668 | // but apparently different definitions (different source-file/line-no). | |
2669 | ||
2670 | void | |
17a1d0a9 ILT |
2671 | Symbol_table::detect_odr_violations(const Task* task, |
2672 | const char* output_file_name) const | |
70e654ba ILT |
2673 | { |
2674 | for (Odr_map::const_iterator it = candidate_odr_violations_.begin(); | |
2675 | it != candidate_odr_violations_.end(); | |
2676 | ++it) | |
2677 | { | |
2678 | const char* symbol_name = it->first; | |
2679 | // We use a sorted set so the output is deterministic. | |
ff541f30 | 2680 | std::set<std::string, Odr_violation_compare> line_nums; |
70e654ba | 2681 | |
b01c0a4a ILT |
2682 | for (Unordered_set<Symbol_location, Symbol_location_hash>::const_iterator |
2683 | locs = it->second.begin(); | |
2684 | locs != it->second.end(); | |
2685 | ++locs) | |
70e654ba ILT |
2686 | { |
2687 | // We need to lock the object in order to read it. This | |
17a1d0a9 ILT |
2688 | // means that we have to run in a singleton Task. If we |
2689 | // want to run this in a general Task for better | |
2690 | // performance, we will need one Task for object, plus | |
2691 | // appropriate locking to ensure that we don't conflict with | |
e4e5049b CS |
2692 | // other uses of the object. Also note, one_addr2line is not |
2693 | // currently thread-safe. | |
17a1d0a9 | 2694 | Task_lock_obj<Object> tl(task, locs->object); |
e4e5049b | 2695 | // 16 is the size of the object-cache that one_addr2line should use. |
a55ce7fe | 2696 | std::string lineno = Dwarf_line_info::one_addr2line( |
e4e5049b | 2697 | locs->object, locs->shndx, locs->offset, 16); |
70e654ba ILT |
2698 | if (!lineno.empty()) |
2699 | line_nums.insert(lineno); | |
2700 | } | |
2701 | ||
2702 | if (line_nums.size() > 1) | |
2703 | { | |
dd8670e5 | 2704 | gold_warning(_("while linking %s: symbol '%s' defined in multiple " |
78f15696 | 2705 | "places (possible ODR violation):"), |
a2b1aa12 | 2706 | output_file_name, demangle(symbol_name).c_str()); |
70e654ba ILT |
2707 | for (std::set<std::string>::const_iterator it2 = line_nums.begin(); |
2708 | it2 != line_nums.end(); | |
2709 | ++it2) | |
2710 | fprintf(stderr, " %s\n", it2->c_str()); | |
2711 | } | |
2712 | } | |
e4e5049b CS |
2713 | // We only call one_addr2line() in this function, so we can clear its cache. |
2714 | Dwarf_line_info::clear_addr2line_cache(); | |
70e654ba ILT |
2715 | } |
2716 | ||
f6ce93d6 ILT |
2717 | // Warnings functions. |
2718 | ||
2719 | // Add a new warning. | |
2720 | ||
2721 | void | |
2722 | Warnings::add_warning(Symbol_table* symtab, const char* name, Object* obj, | |
cb295612 | 2723 | const std::string& warning) |
f6ce93d6 ILT |
2724 | { |
2725 | name = symtab->canonicalize_name(name); | |
cb295612 | 2726 | this->warnings_[name].set(obj, warning); |
f6ce93d6 ILT |
2727 | } |
2728 | ||
2729 | // Look through the warnings and mark the symbols for which we should | |
2730 | // warn. This is called during Layout::finalize when we know the | |
2731 | // sources for all the symbols. | |
2732 | ||
2733 | void | |
cb295612 | 2734 | Warnings::note_warnings(Symbol_table* symtab) |
f6ce93d6 ILT |
2735 | { |
2736 | for (Warning_table::iterator p = this->warnings_.begin(); | |
2737 | p != this->warnings_.end(); | |
2738 | ++p) | |
2739 | { | |
2740 | Symbol* sym = symtab->lookup(p->first, NULL); | |
2741 | if (sym != NULL | |
2742 | && sym->source() == Symbol::FROM_OBJECT | |
2743 | && sym->object() == p->second.object) | |
cb295612 | 2744 | sym->set_has_warning(); |
f6ce93d6 ILT |
2745 | } |
2746 | } | |
2747 | ||
2748 | // Issue a warning. This is called when we see a relocation against a | |
2749 | // symbol for which has a warning. | |
2750 | ||
75f2446e | 2751 | template<int size, bool big_endian> |
f6ce93d6 | 2752 | void |
75f2446e ILT |
2753 | Warnings::issue_warning(const Symbol* sym, |
2754 | const Relocate_info<size, big_endian>* relinfo, | |
2755 | size_t relnum, off_t reloffset) const | |
f6ce93d6 | 2756 | { |
a3ad94ed | 2757 | gold_assert(sym->has_warning()); |
f6ce93d6 | 2758 | Warning_table::const_iterator p = this->warnings_.find(sym->name()); |
a3ad94ed | 2759 | gold_assert(p != this->warnings_.end()); |
75f2446e ILT |
2760 | gold_warning_at_location(relinfo, relnum, reloffset, |
2761 | "%s", p->second.text.c_str()); | |
f6ce93d6 ILT |
2762 | } |
2763 | ||
14bfc3f5 ILT |
2764 | // Instantiate the templates we need. We could use the configure |
2765 | // script to restrict this to only the ones needed for implemented | |
2766 | // targets. | |
2767 | ||
c7912668 ILT |
2768 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2769 | template | |
2770 | void | |
2771 | Sized_symbol<32>::allocate_common(Output_data*, Value_type); | |
2772 | #endif | |
2773 | ||
2774 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2775 | template | |
2776 | void | |
2777 | Sized_symbol<64>::allocate_common(Output_data*, Value_type); | |
2778 | #endif | |
2779 | ||
193a53d9 | 2780 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
2781 | template |
2782 | void | |
193a53d9 ILT |
2783 | Symbol_table::add_from_relobj<32, false>( |
2784 | Sized_relobj<32, false>* relobj, | |
f6ce93d6 | 2785 | const unsigned char* syms, |
14bfc3f5 | 2786 | size_t count, |
d491d34e | 2787 | size_t symndx_offset, |
14bfc3f5 ILT |
2788 | const char* sym_names, |
2789 | size_t sym_name_size, | |
ae6dce4d | 2790 | Sized_relobj<32, false>::Symbols* sympointers, |
92de84a6 | 2791 | size_t* defined); |
193a53d9 | 2792 | #endif |
14bfc3f5 | 2793 | |
193a53d9 | 2794 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
2795 | template |
2796 | void | |
193a53d9 ILT |
2797 | Symbol_table::add_from_relobj<32, true>( |
2798 | Sized_relobj<32, true>* relobj, | |
f6ce93d6 | 2799 | const unsigned char* syms, |
14bfc3f5 | 2800 | size_t count, |
d491d34e | 2801 | size_t symndx_offset, |
14bfc3f5 ILT |
2802 | const char* sym_names, |
2803 | size_t sym_name_size, | |
ae6dce4d | 2804 | Sized_relobj<32, true>::Symbols* sympointers, |
92de84a6 | 2805 | size_t* defined); |
193a53d9 | 2806 | #endif |
14bfc3f5 | 2807 | |
193a53d9 | 2808 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
2809 | template |
2810 | void | |
193a53d9 ILT |
2811 | Symbol_table::add_from_relobj<64, false>( |
2812 | Sized_relobj<64, false>* relobj, | |
f6ce93d6 | 2813 | const unsigned char* syms, |
14bfc3f5 | 2814 | size_t count, |
d491d34e | 2815 | size_t symndx_offset, |
14bfc3f5 ILT |
2816 | const char* sym_names, |
2817 | size_t sym_name_size, | |
ae6dce4d | 2818 | Sized_relobj<64, false>::Symbols* sympointers, |
92de84a6 | 2819 | size_t* defined); |
193a53d9 | 2820 | #endif |
14bfc3f5 | 2821 | |
193a53d9 | 2822 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
2823 | template |
2824 | void | |
193a53d9 ILT |
2825 | Symbol_table::add_from_relobj<64, true>( |
2826 | Sized_relobj<64, true>* relobj, | |
f6ce93d6 | 2827 | const unsigned char* syms, |
14bfc3f5 | 2828 | size_t count, |
d491d34e | 2829 | size_t symndx_offset, |
14bfc3f5 ILT |
2830 | const char* sym_names, |
2831 | size_t sym_name_size, | |
ae6dce4d | 2832 | Sized_relobj<64, true>::Symbols* sympointers, |
92de84a6 | 2833 | size_t* defined); |
193a53d9 | 2834 | #endif |
14bfc3f5 | 2835 | |
89fc3421 CC |
2836 | #ifdef HAVE_TARGET_32_LITTLE |
2837 | template | |
2838 | Symbol* | |
2839 | Symbol_table::add_from_pluginobj<32, false>( | |
2840 | Sized_pluginobj<32, false>* obj, | |
2841 | const char* name, | |
2842 | const char* ver, | |
2843 | elfcpp::Sym<32, false>* sym); | |
2844 | #endif | |
2845 | ||
2846 | #ifdef HAVE_TARGET_32_BIG | |
2847 | template | |
2848 | Symbol* | |
2849 | Symbol_table::add_from_pluginobj<32, true>( | |
2850 | Sized_pluginobj<32, true>* obj, | |
2851 | const char* name, | |
2852 | const char* ver, | |
2853 | elfcpp::Sym<32, true>* sym); | |
2854 | #endif | |
2855 | ||
2856 | #ifdef HAVE_TARGET_64_LITTLE | |
2857 | template | |
2858 | Symbol* | |
2859 | Symbol_table::add_from_pluginobj<64, false>( | |
2860 | Sized_pluginobj<64, false>* obj, | |
2861 | const char* name, | |
2862 | const char* ver, | |
2863 | elfcpp::Sym<64, false>* sym); | |
2864 | #endif | |
2865 | ||
2866 | #ifdef HAVE_TARGET_64_BIG | |
2867 | template | |
2868 | Symbol* | |
2869 | Symbol_table::add_from_pluginobj<64, true>( | |
2870 | Sized_pluginobj<64, true>* obj, | |
2871 | const char* name, | |
2872 | const char* ver, | |
2873 | elfcpp::Sym<64, true>* sym); | |
2874 | #endif | |
2875 | ||
193a53d9 | 2876 | #ifdef HAVE_TARGET_32_LITTLE |
dbe717ef ILT |
2877 | template |
2878 | void | |
193a53d9 ILT |
2879 | Symbol_table::add_from_dynobj<32, false>( |
2880 | Sized_dynobj<32, false>* dynobj, | |
dbe717ef ILT |
2881 | const unsigned char* syms, |
2882 | size_t count, | |
2883 | const char* sym_names, | |
2884 | size_t sym_name_size, | |
2885 | const unsigned char* versym, | |
2886 | size_t versym_size, | |
92de84a6 ILT |
2887 | const std::vector<const char*>* version_map, |
2888 | Sized_relobj<32, false>::Symbols* sympointers, | |
2889 | size_t* defined); | |
193a53d9 | 2890 | #endif |
dbe717ef | 2891 | |
193a53d9 | 2892 | #ifdef HAVE_TARGET_32_BIG |
dbe717ef ILT |
2893 | template |
2894 | void | |
193a53d9 ILT |
2895 | Symbol_table::add_from_dynobj<32, true>( |
2896 | Sized_dynobj<32, true>* dynobj, | |
dbe717ef ILT |
2897 | const unsigned char* syms, |
2898 | size_t count, | |
2899 | const char* sym_names, | |
2900 | size_t sym_name_size, | |
2901 | const unsigned char* versym, | |
2902 | size_t versym_size, | |
92de84a6 ILT |
2903 | const std::vector<const char*>* version_map, |
2904 | Sized_relobj<32, true>::Symbols* sympointers, | |
2905 | size_t* defined); | |
193a53d9 | 2906 | #endif |
dbe717ef | 2907 | |
193a53d9 | 2908 | #ifdef HAVE_TARGET_64_LITTLE |
dbe717ef ILT |
2909 | template |
2910 | void | |
193a53d9 ILT |
2911 | Symbol_table::add_from_dynobj<64, false>( |
2912 | Sized_dynobj<64, false>* dynobj, | |
dbe717ef ILT |
2913 | const unsigned char* syms, |
2914 | size_t count, | |
2915 | const char* sym_names, | |
2916 | size_t sym_name_size, | |
2917 | const unsigned char* versym, | |
2918 | size_t versym_size, | |
92de84a6 ILT |
2919 | const std::vector<const char*>* version_map, |
2920 | Sized_relobj<64, false>::Symbols* sympointers, | |
2921 | size_t* defined); | |
193a53d9 | 2922 | #endif |
dbe717ef | 2923 | |
193a53d9 | 2924 | #ifdef HAVE_TARGET_64_BIG |
dbe717ef ILT |
2925 | template |
2926 | void | |
193a53d9 ILT |
2927 | Symbol_table::add_from_dynobj<64, true>( |
2928 | Sized_dynobj<64, true>* dynobj, | |
dbe717ef ILT |
2929 | const unsigned char* syms, |
2930 | size_t count, | |
2931 | const char* sym_names, | |
2932 | size_t sym_name_size, | |
2933 | const unsigned char* versym, | |
2934 | size_t versym_size, | |
92de84a6 ILT |
2935 | const std::vector<const char*>* version_map, |
2936 | Sized_relobj<64, true>::Symbols* sympointers, | |
2937 | size_t* defined); | |
193a53d9 | 2938 | #endif |
dbe717ef | 2939 | |
46fe1623 ILT |
2940 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
2941 | template | |
2942 | void | |
fe8718a4 | 2943 | Symbol_table::define_with_copy_reloc<32>( |
fe8718a4 ILT |
2944 | Sized_symbol<32>* sym, |
2945 | Output_data* posd, | |
2946 | elfcpp::Elf_types<32>::Elf_Addr value); | |
46fe1623 ILT |
2947 | #endif |
2948 | ||
2949 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
2950 | template | |
2951 | void | |
fe8718a4 | 2952 | Symbol_table::define_with_copy_reloc<64>( |
fe8718a4 ILT |
2953 | Sized_symbol<64>* sym, |
2954 | Output_data* posd, | |
2955 | elfcpp::Elf_types<64>::Elf_Addr value); | |
46fe1623 ILT |
2956 | #endif |
2957 | ||
75f2446e ILT |
2958 | #ifdef HAVE_TARGET_32_LITTLE |
2959 | template | |
2960 | void | |
2961 | Warnings::issue_warning<32, false>(const Symbol* sym, | |
2962 | const Relocate_info<32, false>* relinfo, | |
2963 | size_t relnum, off_t reloffset) const; | |
2964 | #endif | |
2965 | ||
2966 | #ifdef HAVE_TARGET_32_BIG | |
2967 | template | |
2968 | void | |
2969 | Warnings::issue_warning<32, true>(const Symbol* sym, | |
2970 | const Relocate_info<32, true>* relinfo, | |
2971 | size_t relnum, off_t reloffset) const; | |
2972 | #endif | |
2973 | ||
2974 | #ifdef HAVE_TARGET_64_LITTLE | |
2975 | template | |
2976 | void | |
2977 | Warnings::issue_warning<64, false>(const Symbol* sym, | |
2978 | const Relocate_info<64, false>* relinfo, | |
2979 | size_t relnum, off_t reloffset) const; | |
2980 | #endif | |
2981 | ||
2982 | #ifdef HAVE_TARGET_64_BIG | |
2983 | template | |
2984 | void | |
2985 | Warnings::issue_warning<64, true>(const Symbol* sym, | |
2986 | const Relocate_info<64, true>* relinfo, | |
2987 | size_t relnum, off_t reloffset) const; | |
2988 | #endif | |
2989 | ||
14bfc3f5 | 2990 | } // End namespace gold. |