Commit | Line | Data |
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14bfc3f5 ILT |
1 | // resolve.cc -- symbol resolution for gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include "elfcpp.h" | |
6 | #include "target.h" | |
7 | #include "object.h" | |
8 | #include "symtab.h" | |
9 | ||
10 | namespace gold | |
11 | { | |
12 | ||
1564db8d ILT |
13 | // Symbol methods used in this file. |
14 | ||
15 | // Override the fields in Symbol. | |
16 | ||
17 | template<int size, bool big_endian> | |
18 | void | |
19 | Symbol::override_base(const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 20 | Object* object, const char* version) |
1564db8d | 21 | { |
a3ad94ed | 22 | gold_assert(this->source_ == FROM_OBJECT); |
ead1e424 | 23 | this->u_.from_object.object = object; |
14b31740 ILT |
24 | if (version != NULL && this->version() != version) |
25 | { | |
26 | gold_assert(this->version() == NULL); | |
27 | this->version_ = version; | |
28 | } | |
ead1e424 | 29 | // FIXME: Handle SHN_XINDEX. |
16649710 | 30 | this->u_.from_object.shndx = sym.get_st_shndx(); |
1564db8d ILT |
31 | this->type_ = sym.get_st_type(); |
32 | this->binding_ = sym.get_st_bind(); | |
33 | this->visibility_ = sym.get_st_visibility(); | |
ead1e424 | 34 | this->nonvis_ = sym.get_st_nonvis(); |
0d4f1889 ILT |
35 | if (object->is_dynamic()) |
36 | this->in_dyn_ = true; | |
37 | else | |
38 | this->in_reg_ = true; | |
1564db8d ILT |
39 | } |
40 | ||
41 | // Override the fields in Sized_symbol. | |
42 | ||
43 | template<int size> | |
44 | template<bool big_endian> | |
45 | void | |
46 | Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 47 | Object* object, const char* version) |
1564db8d | 48 | { |
14b31740 | 49 | this->override_base(sym, object, version); |
1564db8d | 50 | this->value_ = sym.get_st_value(); |
ead1e424 | 51 | this->symsize_ = sym.get_st_size(); |
1564db8d ILT |
52 | } |
53 | ||
86f2e683 ILT |
54 | // The resolve functions build a little code for each symbol. |
55 | // Bit 0: 0 for global, 1 for weak. | |
56 | // Bit 1: 0 for regular object, 1 for shared object | |
57 | // Bits 2-3: 0 for normal, 1 for undefined, 2 for common | |
58 | // This gives us values from 0 to 11. | |
59 | ||
60 | static const int global_or_weak_shift = 0; | |
61 | static const unsigned int global_flag = 0 << global_or_weak_shift; | |
62 | static const unsigned int weak_flag = 1 << global_or_weak_shift; | |
63 | ||
64 | static const int regular_or_dynamic_shift = 1; | |
65 | static const unsigned int regular_flag = 0 << regular_or_dynamic_shift; | |
66 | static const unsigned int dynamic_flag = 1 << regular_or_dynamic_shift; | |
67 | ||
68 | static const int def_undef_or_common_shift = 2; | |
69 | static const unsigned int def_flag = 0 << def_undef_or_common_shift; | |
70 | static const unsigned int undef_flag = 1 << def_undef_or_common_shift; | |
71 | static const unsigned int common_flag = 2 << def_undef_or_common_shift; | |
72 | ||
14bfc3f5 ILT |
73 | // Resolve a symbol. This is called the second and subsequent times |
74 | // we see a symbol. TO is the pre-existing symbol. SYM is the new | |
14b31740 | 75 | // symbol, seen in OBJECT. VERSION of the version of SYM. |
14bfc3f5 ILT |
76 | |
77 | template<int size, bool big_endian> | |
78 | void | |
1564db8d | 79 | Symbol_table::resolve(Sized_symbol<size>* to, |
14bfc3f5 | 80 | const elfcpp::Sym<size, big_endian>& sym, |
14b31740 | 81 | Object* object, const char* version) |
14bfc3f5 ILT |
82 | { |
83 | if (object->target()->has_resolve()) | |
84 | { | |
274e99f9 | 85 | Sized_target<size, big_endian>* sized_target; |
593f47df ILT |
86 | sized_target = object->sized_target |
87 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
88 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
14b31740 | 89 | sized_target->resolve(to, sym, object, version); |
14bfc3f5 ILT |
90 | return; |
91 | } | |
92 | ||
86f2e683 ILT |
93 | if (!object->is_dynamic()) |
94 | { | |
95 | // Record that we've seen this symbol in a regular object. | |
96 | to->set_in_reg(); | |
97 | } | |
98 | else | |
99 | { | |
100 | // Record that we've seen this symbol in a dynamic object. | |
101 | to->set_in_dyn(); | |
102 | } | |
14bfc3f5 | 103 | |
86f2e683 ILT |
104 | unsigned int frombits; |
105 | switch (sym.get_st_bind()) | |
14bfc3f5 ILT |
106 | { |
107 | case elfcpp::STB_GLOBAL: | |
86f2e683 | 108 | frombits = global_flag; |
14bfc3f5 ILT |
109 | break; |
110 | ||
111 | case elfcpp::STB_WEAK: | |
86f2e683 | 112 | frombits = weak_flag; |
14bfc3f5 ILT |
113 | break; |
114 | ||
115 | case elfcpp::STB_LOCAL: | |
86f2e683 ILT |
116 | fprintf(stderr, |
117 | _("%s: %s: invalid STB_LOCAL symbol %s in external symbols\n"), | |
118 | program_name, object->name().c_str(), to->name()); | |
119 | gold_exit(false); | |
14bfc3f5 ILT |
120 | |
121 | default: | |
86f2e683 ILT |
122 | fprintf(stderr, |
123 | _("%s: %s: unsupported symbol binding %d for symbol %s\n"), | |
124 | program_name, object->name().c_str(), | |
125 | static_cast<int>(sym.get_st_bind()), to->name()); | |
126 | gold_exit(false); | |
14bfc3f5 ILT |
127 | } |
128 | ||
86f2e683 ILT |
129 | if (!object->is_dynamic()) |
130 | frombits |= regular_flag; | |
131 | else | |
132 | frombits |= dynamic_flag; | |
14bfc3f5 | 133 | |
86f2e683 | 134 | switch (sym.get_st_shndx()) |
14bfc3f5 ILT |
135 | { |
136 | case elfcpp::SHN_UNDEF: | |
86f2e683 | 137 | frombits |= undef_flag; |
14bfc3f5 ILT |
138 | break; |
139 | ||
140 | case elfcpp::SHN_COMMON: | |
86f2e683 | 141 | frombits |= common_flag; |
14bfc3f5 ILT |
142 | break; |
143 | ||
144 | default: | |
86f2e683 ILT |
145 | if (sym.get_st_type() == elfcpp::STT_COMMON) |
146 | frombits |= common_flag; | |
147 | else | |
148 | frombits |= def_flag; | |
14bfc3f5 ILT |
149 | break; |
150 | } | |
151 | ||
86f2e683 ILT |
152 | bool adjust_common_sizes; |
153 | if (Symbol_table::should_override(to, frombits, &adjust_common_sizes)) | |
154 | { | |
155 | typename Sized_symbol<size>::Size_type tosize = to->symsize(); | |
156 | ||
157 | to->override(sym, object, version); | |
158 | ||
159 | if (adjust_common_sizes && tosize > to->symsize()) | |
160 | to->set_symsize(tosize); | |
161 | } | |
162 | else | |
163 | { | |
164 | if (adjust_common_sizes && sym.get_st_size() > to->symsize()) | |
165 | to->set_symsize(sym.get_st_size()); | |
166 | } | |
167 | } | |
168 | ||
169 | // Handle the core of symbol resolution. This is called with the | |
170 | // existing symbol, TO, and a bitflag describing the new symbol. This | |
171 | // returns true if we should override the existing symbol with the new | |
172 | // one, and returns false otherwise. It sets *ADJUST_COMMON_SIZES to | |
173 | // true if we should set the symbol size to the maximum of the TO and | |
174 | // FROM sizes. It handles error conditions. | |
175 | ||
176 | bool | |
177 | Symbol_table::should_override(const Symbol* to, unsigned int frombits, | |
178 | bool* adjust_common_sizes) | |
179 | { | |
180 | *adjust_common_sizes = false; | |
181 | ||
182 | unsigned int tobits; | |
183 | switch (to->binding()) | |
14bfc3f5 ILT |
184 | { |
185 | case elfcpp::STB_GLOBAL: | |
86f2e683 | 186 | tobits = global_flag; |
14bfc3f5 ILT |
187 | break; |
188 | ||
189 | case elfcpp::STB_WEAK: | |
86f2e683 | 190 | tobits = weak_flag; |
14bfc3f5 ILT |
191 | break; |
192 | ||
193 | case elfcpp::STB_LOCAL: | |
86f2e683 ILT |
194 | // We should only see externally visible symbols in the symbol |
195 | // table. | |
196 | gold_unreachable(); | |
14bfc3f5 ILT |
197 | |
198 | default: | |
86f2e683 ILT |
199 | // Any target which wants to handle STB_LOOS, etc., needs to |
200 | // define a resolve method. | |
201 | gold_unreachable(); | |
14bfc3f5 ILT |
202 | } |
203 | ||
86f2e683 ILT |
204 | if (to->source() == Symbol::FROM_OBJECT |
205 | && to->object()->is_dynamic()) | |
206 | tobits |= dynamic_flag; | |
008db82e | 207 | else |
86f2e683 | 208 | tobits |= regular_flag; |
1564db8d | 209 | |
86f2e683 | 210 | switch (to->shndx()) |
14bfc3f5 ILT |
211 | { |
212 | case elfcpp::SHN_UNDEF: | |
86f2e683 | 213 | tobits |= undef_flag; |
14bfc3f5 ILT |
214 | break; |
215 | ||
216 | case elfcpp::SHN_COMMON: | |
86f2e683 | 217 | tobits |= common_flag; |
14bfc3f5 ILT |
218 | break; |
219 | ||
220 | default: | |
86f2e683 ILT |
221 | if (to->type() == elfcpp::STT_COMMON) |
222 | tobits |= common_flag; | |
223 | else | |
224 | tobits |= def_flag; | |
14bfc3f5 ILT |
225 | break; |
226 | } | |
227 | ||
1564db8d ILT |
228 | // FIXME: Warn if either but not both of TO and SYM are STT_TLS. |
229 | ||
14bfc3f5 ILT |
230 | // We use a giant switch table for symbol resolution. This code is |
231 | // unwieldy, but: 1) it is efficient; 2) we definitely handle all | |
232 | // cases; 3) it is easy to change the handling of a particular case. | |
233 | // The alternative would be a series of conditionals, but it is easy | |
234 | // to get the ordering wrong. This could also be done as a table, | |
235 | // but that is no easier to understand than this large switch | |
236 | // statement. | |
237 | ||
86f2e683 ILT |
238 | // These are the values generated by the bit codes. |
239 | enum | |
240 | { | |
241 | DEF = global_flag | regular_flag | def_flag, | |
242 | WEAK_DEF = weak_flag | regular_flag | def_flag, | |
243 | DYN_DEF = global_flag | dynamic_flag | def_flag, | |
244 | DYN_WEAK_DEF = weak_flag | dynamic_flag | def_flag, | |
245 | UNDEF = global_flag | regular_flag | undef_flag, | |
246 | WEAK_UNDEF = weak_flag | regular_flag | undef_flag, | |
247 | DYN_UNDEF = global_flag | dynamic_flag | undef_flag, | |
248 | DYN_WEAK_UNDEF = weak_flag | dynamic_flag | undef_flag, | |
249 | COMMON = global_flag | regular_flag | common_flag, | |
250 | WEAK_COMMON = weak_flag | regular_flag | common_flag, | |
251 | DYN_COMMON = global_flag | dynamic_flag | common_flag, | |
252 | DYN_WEAK_COMMON = weak_flag | dynamic_flag | common_flag | |
253 | }; | |
254 | ||
14bfc3f5 ILT |
255 | switch (tobits * 16 + frombits) |
256 | { | |
257 | case DEF * 16 + DEF: | |
12e14209 | 258 | // Two definitions of the same symbol. |
86f2e683 ILT |
259 | fprintf(stderr, "%s: multiple definition of %s\n", |
260 | program_name, to->name()); | |
12e14209 | 261 | // FIXME: Report locations. Record that we have seen an error. |
86f2e683 | 262 | return false; |
14bfc3f5 ILT |
263 | |
264 | case WEAK_DEF * 16 + DEF: | |
1564db8d ILT |
265 | // We've seen a weak definition, and now we see a strong |
266 | // definition. In the original SVR4 linker, this was treated as | |
267 | // a multiple definition error. In the Solaris linker and the | |
268 | // GNU linker, a weak definition followed by a regular | |
269 | // definition causes the weak definition to be overridden. We | |
270 | // are currently compatible with the GNU linker. In the future | |
271 | // we should add a target specific option to change this. | |
272 | // FIXME. | |
86f2e683 | 273 | return true; |
14bfc3f5 ILT |
274 | |
275 | case DYN_DEF * 16 + DEF: | |
276 | case DYN_WEAK_DEF * 16 + DEF: | |
1564db8d ILT |
277 | // We've seen a definition in a dynamic object, and now we see a |
278 | // definition in a regular object. The definition in the | |
279 | // regular object overrides the definition in the dynamic | |
280 | // object. | |
86f2e683 | 281 | return true; |
1564db8d | 282 | |
14bfc3f5 ILT |
283 | case UNDEF * 16 + DEF: |
284 | case WEAK_UNDEF * 16 + DEF: | |
285 | case DYN_UNDEF * 16 + DEF: | |
286 | case DYN_WEAK_UNDEF * 16 + DEF: | |
1564db8d ILT |
287 | // We've seen an undefined reference, and now we see a |
288 | // definition. We use the definition. | |
86f2e683 | 289 | return true; |
1564db8d | 290 | |
14bfc3f5 ILT |
291 | case COMMON * 16 + DEF: |
292 | case WEAK_COMMON * 16 + DEF: | |
293 | case DYN_COMMON * 16 + DEF: | |
294 | case DYN_WEAK_COMMON * 16 + DEF: | |
1564db8d | 295 | // We've seen a common symbol and now we see a definition. The |
14b31740 | 296 | // definition overrides. FIXME: We should optionally issue, version a |
1564db8d | 297 | // warning. |
86f2e683 | 298 | return true; |
14bfc3f5 ILT |
299 | |
300 | case DEF * 16 + WEAK_DEF: | |
301 | case WEAK_DEF * 16 + WEAK_DEF: | |
1564db8d ILT |
302 | // We've seen a definition and now we see a weak definition. We |
303 | // ignore the new weak definition. | |
86f2e683 | 304 | return false; |
1564db8d | 305 | |
14bfc3f5 ILT |
306 | case DYN_DEF * 16 + WEAK_DEF: |
307 | case DYN_WEAK_DEF * 16 + WEAK_DEF: | |
1564db8d ILT |
308 | // We've seen a dynamic definition and now we see a regular weak |
309 | // definition. The regular weak definition overrides. | |
86f2e683 | 310 | return true; |
1564db8d | 311 | |
14bfc3f5 ILT |
312 | case UNDEF * 16 + WEAK_DEF: |
313 | case WEAK_UNDEF * 16 + WEAK_DEF: | |
314 | case DYN_UNDEF * 16 + WEAK_DEF: | |
315 | case DYN_WEAK_UNDEF * 16 + WEAK_DEF: | |
1564db8d | 316 | // A weak definition of a currently undefined symbol. |
86f2e683 | 317 | return true; |
1564db8d | 318 | |
14bfc3f5 ILT |
319 | case COMMON * 16 + WEAK_DEF: |
320 | case WEAK_COMMON * 16 + WEAK_DEF: | |
1564db8d | 321 | // A weak definition does not override a common definition. |
86f2e683 | 322 | return false; |
1564db8d | 323 | |
14bfc3f5 ILT |
324 | case DYN_COMMON * 16 + WEAK_DEF: |
325 | case DYN_WEAK_COMMON * 16 + WEAK_DEF: | |
1564db8d ILT |
326 | // A weak definition does override a definition in a dynamic |
327 | // object. FIXME: We should optionally issue a warning. | |
86f2e683 | 328 | return true; |
14bfc3f5 ILT |
329 | |
330 | case DEF * 16 + DYN_DEF: | |
331 | case WEAK_DEF * 16 + DYN_DEF: | |
332 | case DYN_DEF * 16 + DYN_DEF: | |
333 | case DYN_WEAK_DEF * 16 + DYN_DEF: | |
1564db8d | 334 | // Ignore a dynamic definition if we already have a definition. |
86f2e683 | 335 | return false; |
1564db8d | 336 | |
14bfc3f5 ILT |
337 | case UNDEF * 16 + DYN_DEF: |
338 | case WEAK_UNDEF * 16 + DYN_DEF: | |
339 | case DYN_UNDEF * 16 + DYN_DEF: | |
340 | case DYN_WEAK_UNDEF * 16 + DYN_DEF: | |
1564db8d | 341 | // Use a dynamic definition if we have a reference. |
86f2e683 | 342 | return true; |
1564db8d | 343 | |
14bfc3f5 ILT |
344 | case COMMON * 16 + DYN_DEF: |
345 | case WEAK_COMMON * 16 + DYN_DEF: | |
346 | case DYN_COMMON * 16 + DYN_DEF: | |
347 | case DYN_WEAK_COMMON * 16 + DYN_DEF: | |
1564db8d ILT |
348 | // Ignore a dynamic definition if we already have a common |
349 | // definition. | |
86f2e683 | 350 | return false; |
14bfc3f5 ILT |
351 | |
352 | case DEF * 16 + DYN_WEAK_DEF: | |
353 | case WEAK_DEF * 16 + DYN_WEAK_DEF: | |
354 | case DYN_DEF * 16 + DYN_WEAK_DEF: | |
355 | case DYN_WEAK_DEF * 16 + DYN_WEAK_DEF: | |
1564db8d ILT |
356 | // Ignore a weak dynamic definition if we already have a |
357 | // definition. | |
86f2e683 | 358 | return false; |
1564db8d | 359 | |
14bfc3f5 ILT |
360 | case UNDEF * 16 + DYN_WEAK_DEF: |
361 | case WEAK_UNDEF * 16 + DYN_WEAK_DEF: | |
362 | case DYN_UNDEF * 16 + DYN_WEAK_DEF: | |
363 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF: | |
1564db8d | 364 | // Use a weak dynamic definition if we have a reference. |
86f2e683 | 365 | return true; |
1564db8d | 366 | |
14bfc3f5 ILT |
367 | case COMMON * 16 + DYN_WEAK_DEF: |
368 | case WEAK_COMMON * 16 + DYN_WEAK_DEF: | |
369 | case DYN_COMMON * 16 + DYN_WEAK_DEF: | |
370 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_DEF: | |
1564db8d ILT |
371 | // Ignore a weak dynamic definition if we already have a common |
372 | // definition. | |
86f2e683 | 373 | return false; |
14bfc3f5 ILT |
374 | |
375 | case DEF * 16 + UNDEF: | |
376 | case WEAK_DEF * 16 + UNDEF: | |
377 | case DYN_DEF * 16 + UNDEF: | |
378 | case DYN_WEAK_DEF * 16 + UNDEF: | |
379 | case UNDEF * 16 + UNDEF: | |
ead1e424 | 380 | // A new undefined reference tells us nothing. |
86f2e683 | 381 | return false; |
ead1e424 | 382 | |
14bfc3f5 ILT |
383 | case WEAK_UNDEF * 16 + UNDEF: |
384 | case DYN_UNDEF * 16 + UNDEF: | |
385 | case DYN_WEAK_UNDEF * 16 + UNDEF: | |
ead1e424 | 386 | // A strong undef overrides a dynamic or weak undef. |
86f2e683 | 387 | return true; |
ead1e424 | 388 | |
14bfc3f5 ILT |
389 | case COMMON * 16 + UNDEF: |
390 | case WEAK_COMMON * 16 + UNDEF: | |
391 | case DYN_COMMON * 16 + UNDEF: | |
392 | case DYN_WEAK_COMMON * 16 + UNDEF: | |
1564db8d | 393 | // A new undefined reference tells us nothing. |
86f2e683 | 394 | return false; |
14bfc3f5 ILT |
395 | |
396 | case DEF * 16 + WEAK_UNDEF: | |
397 | case WEAK_DEF * 16 + WEAK_UNDEF: | |
398 | case DYN_DEF * 16 + WEAK_UNDEF: | |
399 | case DYN_WEAK_DEF * 16 + WEAK_UNDEF: | |
400 | case UNDEF * 16 + WEAK_UNDEF: | |
401 | case WEAK_UNDEF * 16 + WEAK_UNDEF: | |
402 | case DYN_UNDEF * 16 + WEAK_UNDEF: | |
403 | case DYN_WEAK_UNDEF * 16 + WEAK_UNDEF: | |
404 | case COMMON * 16 + WEAK_UNDEF: | |
405 | case WEAK_COMMON * 16 + WEAK_UNDEF: | |
406 | case DYN_COMMON * 16 + WEAK_UNDEF: | |
407 | case DYN_WEAK_COMMON * 16 + WEAK_UNDEF: | |
1564db8d | 408 | // A new weak undefined reference tells us nothing. |
86f2e683 | 409 | return false; |
14bfc3f5 ILT |
410 | |
411 | case DEF * 16 + DYN_UNDEF: | |
412 | case WEAK_DEF * 16 + DYN_UNDEF: | |
413 | case DYN_DEF * 16 + DYN_UNDEF: | |
414 | case DYN_WEAK_DEF * 16 + DYN_UNDEF: | |
415 | case UNDEF * 16 + DYN_UNDEF: | |
416 | case WEAK_UNDEF * 16 + DYN_UNDEF: | |
417 | case DYN_UNDEF * 16 + DYN_UNDEF: | |
418 | case DYN_WEAK_UNDEF * 16 + DYN_UNDEF: | |
419 | case COMMON * 16 + DYN_UNDEF: | |
420 | case WEAK_COMMON * 16 + DYN_UNDEF: | |
421 | case DYN_COMMON * 16 + DYN_UNDEF: | |
422 | case DYN_WEAK_COMMON * 16 + DYN_UNDEF: | |
1564db8d | 423 | // A new dynamic undefined reference tells us nothing. |
86f2e683 | 424 | return false; |
14bfc3f5 ILT |
425 | |
426 | case DEF * 16 + DYN_WEAK_UNDEF: | |
427 | case WEAK_DEF * 16 + DYN_WEAK_UNDEF: | |
428 | case DYN_DEF * 16 + DYN_WEAK_UNDEF: | |
429 | case DYN_WEAK_DEF * 16 + DYN_WEAK_UNDEF: | |
430 | case UNDEF * 16 + DYN_WEAK_UNDEF: | |
431 | case WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: | |
432 | case DYN_UNDEF * 16 + DYN_WEAK_UNDEF: | |
433 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: | |
434 | case COMMON * 16 + DYN_WEAK_UNDEF: | |
435 | case WEAK_COMMON * 16 + DYN_WEAK_UNDEF: | |
436 | case DYN_COMMON * 16 + DYN_WEAK_UNDEF: | |
437 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_UNDEF: | |
1564db8d | 438 | // A new weak dynamic undefined reference tells us nothing. |
86f2e683 | 439 | return false; |
14bfc3f5 ILT |
440 | |
441 | case DEF * 16 + COMMON: | |
1564db8d | 442 | // A common symbol does not override a definition. |
86f2e683 | 443 | return false; |
1564db8d | 444 | |
14bfc3f5 ILT |
445 | case WEAK_DEF * 16 + COMMON: |
446 | case DYN_DEF * 16 + COMMON: | |
447 | case DYN_WEAK_DEF * 16 + COMMON: | |
1564db8d ILT |
448 | // A common symbol does override a weak definition or a dynamic |
449 | // definition. | |
86f2e683 | 450 | return true; |
1564db8d | 451 | |
14bfc3f5 ILT |
452 | case UNDEF * 16 + COMMON: |
453 | case WEAK_UNDEF * 16 + COMMON: | |
454 | case DYN_UNDEF * 16 + COMMON: | |
455 | case DYN_WEAK_UNDEF * 16 + COMMON: | |
1564db8d | 456 | // A common symbol is a definition for a reference. |
86f2e683 | 457 | return true; |
1564db8d | 458 | |
14bfc3f5 | 459 | case COMMON * 16 + COMMON: |
ead1e424 | 460 | // Set the size to the maximum. |
86f2e683 ILT |
461 | *adjust_common_sizes = true; |
462 | return false; | |
ead1e424 | 463 | |
14bfc3f5 | 464 | case WEAK_COMMON * 16 + COMMON: |
ead1e424 ILT |
465 | // I'm not sure just what a weak common symbol means, but |
466 | // presumably it can be overridden by a regular common symbol. | |
86f2e683 | 467 | return true; |
ead1e424 | 468 | |
14bfc3f5 ILT |
469 | case DYN_COMMON * 16 + COMMON: |
470 | case DYN_WEAK_COMMON * 16 + COMMON: | |
86f2e683 ILT |
471 | // Use the real common symbol, but adjust the size if necessary. |
472 | *adjust_common_sizes = true; | |
473 | return true; | |
14bfc3f5 ILT |
474 | |
475 | case DEF * 16 + WEAK_COMMON: | |
476 | case WEAK_DEF * 16 + WEAK_COMMON: | |
477 | case DYN_DEF * 16 + WEAK_COMMON: | |
478 | case DYN_WEAK_DEF * 16 + WEAK_COMMON: | |
ead1e424 ILT |
479 | // Whatever a weak common symbol is, it won't override a |
480 | // definition. | |
86f2e683 | 481 | return false; |
ead1e424 | 482 | |
14bfc3f5 ILT |
483 | case UNDEF * 16 + WEAK_COMMON: |
484 | case WEAK_UNDEF * 16 + WEAK_COMMON: | |
485 | case DYN_UNDEF * 16 + WEAK_COMMON: | |
486 | case DYN_WEAK_UNDEF * 16 + WEAK_COMMON: | |
ead1e424 | 487 | // A weak common symbol is better than an undefined symbol. |
86f2e683 | 488 | return true; |
ead1e424 | 489 | |
14bfc3f5 ILT |
490 | case COMMON * 16 + WEAK_COMMON: |
491 | case WEAK_COMMON * 16 + WEAK_COMMON: | |
492 | case DYN_COMMON * 16 + WEAK_COMMON: | |
493 | case DYN_WEAK_COMMON * 16 + WEAK_COMMON: | |
ead1e424 ILT |
494 | // Ignore a weak common symbol in the presence of a real common |
495 | // symbol. | |
86f2e683 | 496 | return false; |
14bfc3f5 ILT |
497 | |
498 | case DEF * 16 + DYN_COMMON: | |
499 | case WEAK_DEF * 16 + DYN_COMMON: | |
500 | case DYN_DEF * 16 + DYN_COMMON: | |
501 | case DYN_WEAK_DEF * 16 + DYN_COMMON: | |
ead1e424 ILT |
502 | // Ignore a dynamic common symbol in the presence of a |
503 | // definition. | |
86f2e683 | 504 | return false; |
ead1e424 | 505 | |
14bfc3f5 ILT |
506 | case UNDEF * 16 + DYN_COMMON: |
507 | case WEAK_UNDEF * 16 + DYN_COMMON: | |
508 | case DYN_UNDEF * 16 + DYN_COMMON: | |
509 | case DYN_WEAK_UNDEF * 16 + DYN_COMMON: | |
ead1e424 | 510 | // A dynamic common symbol is a definition of sorts. |
86f2e683 | 511 | return true; |
ead1e424 | 512 | |
14bfc3f5 ILT |
513 | case COMMON * 16 + DYN_COMMON: |
514 | case WEAK_COMMON * 16 + DYN_COMMON: | |
515 | case DYN_COMMON * 16 + DYN_COMMON: | |
516 | case DYN_WEAK_COMMON * 16 + DYN_COMMON: | |
ead1e424 | 517 | // Set the size to the maximum. |
86f2e683 ILT |
518 | *adjust_common_sizes = true; |
519 | return false; | |
14bfc3f5 ILT |
520 | |
521 | case DEF * 16 + DYN_WEAK_COMMON: | |
522 | case WEAK_DEF * 16 + DYN_WEAK_COMMON: | |
523 | case DYN_DEF * 16 + DYN_WEAK_COMMON: | |
524 | case DYN_WEAK_DEF * 16 + DYN_WEAK_COMMON: | |
ead1e424 | 525 | // A common symbol is ignored in the face of a definition. |
86f2e683 | 526 | return false; |
ead1e424 | 527 | |
14bfc3f5 ILT |
528 | case UNDEF * 16 + DYN_WEAK_COMMON: |
529 | case WEAK_UNDEF * 16 + DYN_WEAK_COMMON: | |
530 | case DYN_UNDEF * 16 + DYN_WEAK_COMMON: | |
531 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_COMMON: | |
ead1e424 | 532 | // I guess a weak common symbol is better than a definition. |
86f2e683 | 533 | return true; |
ead1e424 | 534 | |
14bfc3f5 ILT |
535 | case COMMON * 16 + DYN_WEAK_COMMON: |
536 | case WEAK_COMMON * 16 + DYN_WEAK_COMMON: | |
537 | case DYN_COMMON * 16 + DYN_WEAK_COMMON: | |
538 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_COMMON: | |
ead1e424 | 539 | // Set the size to the maximum. |
86f2e683 ILT |
540 | *adjust_common_sizes = true; |
541 | return false; | |
1564db8d ILT |
542 | |
543 | default: | |
a3ad94ed | 544 | gold_unreachable(); |
14bfc3f5 ILT |
545 | } |
546 | } | |
547 | ||
86f2e683 ILT |
548 | // A special case of should_override which is only called for a strong |
549 | // defined symbol from a regular object file. This is used when | |
550 | // defining special symbols. | |
551 | ||
552 | bool | |
553 | Symbol_table::should_override_with_special(const Symbol* to) | |
554 | { | |
555 | bool adjust_common_sizes; | |
556 | unsigned int frombits = global_flag | regular_flag | def_flag; | |
557 | bool ret = Symbol_table::should_override(to, frombits, &adjust_common_sizes); | |
558 | gold_assert(!adjust_common_sizes); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | // Override symbol base with a special symbol. | |
563 | ||
564 | void | |
565 | Symbol::override_base_with_special(const Symbol* from) | |
566 | { | |
567 | this->source_ = from->source_; | |
568 | switch (from->source_) | |
569 | { | |
570 | case FROM_OBJECT: | |
571 | this->u_.from_object = from->u_.from_object; | |
572 | break; | |
573 | case IN_OUTPUT_DATA: | |
574 | this->u_.in_output_data = from->u_.in_output_data; | |
575 | break; | |
576 | case IN_OUTPUT_SEGMENT: | |
577 | this->u_.in_output_segment = from->u_.in_output_segment; | |
578 | break; | |
579 | case CONSTANT: | |
580 | break; | |
581 | default: | |
582 | gold_unreachable(); | |
583 | break; | |
584 | } | |
585 | ||
586 | if (from->version_ != NULL && this->version_ != from->version_) | |
587 | { | |
588 | gold_assert(this->version_ == NULL); | |
589 | this->version_ = from->version_; | |
590 | } | |
591 | ||
592 | this->type_ = from->type_; | |
593 | this->binding_ = from->binding_; | |
594 | this->visibility_ = from->visibility_; | |
595 | this->nonvis_ = from->nonvis_; | |
596 | ||
597 | // Special symbols are always considered to be regular symbols. | |
598 | this->in_reg_ = true; | |
599 | } | |
600 | ||
601 | // Override a symbol with a special symbol. | |
602 | ||
603 | template<int size> | |
604 | void | |
605 | Sized_symbol<size>::override_with_special(const Sized_symbol<size>* from) | |
606 | { | |
607 | this->override_base_with_special(from); | |
608 | this->value_ = from->value_; | |
609 | this->symsize_ = from->symsize_; | |
610 | } | |
611 | ||
14bfc3f5 ILT |
612 | // Instantiate the templates we need. We could use the configure |
613 | // script to restrict this to only the ones needed for implemented | |
614 | // targets. | |
615 | ||
193a53d9 | 616 | #ifdef HAVE_TARGET_32_LITTLE |
14bfc3f5 ILT |
617 | template |
618 | void | |
193a53d9 | 619 | Symbol_table::resolve<32, false>( |
1564db8d | 620 | Sized_symbol<32>* to, |
193a53d9 | 621 | const elfcpp::Sym<32, false>& sym, |
14b31740 ILT |
622 | Object* object, |
623 | const char* version); | |
193a53d9 | 624 | #endif |
14bfc3f5 | 625 | |
193a53d9 | 626 | #ifdef HAVE_TARGET_32_BIG |
14bfc3f5 ILT |
627 | template |
628 | void | |
193a53d9 | 629 | Symbol_table::resolve<32, true>( |
1564db8d | 630 | Sized_symbol<32>* to, |
193a53d9 | 631 | const elfcpp::Sym<32, true>& sym, |
14b31740 ILT |
632 | Object* object, |
633 | const char* version); | |
193a53d9 | 634 | #endif |
14bfc3f5 | 635 | |
193a53d9 | 636 | #ifdef HAVE_TARGET_64_LITTLE |
14bfc3f5 ILT |
637 | template |
638 | void | |
193a53d9 | 639 | Symbol_table::resolve<64, false>( |
1564db8d | 640 | Sized_symbol<64>* to, |
193a53d9 | 641 | const elfcpp::Sym<64, false>& sym, |
14b31740 ILT |
642 | Object* object, |
643 | const char* version); | |
193a53d9 | 644 | #endif |
14bfc3f5 | 645 | |
193a53d9 | 646 | #ifdef HAVE_TARGET_64_BIG |
14bfc3f5 ILT |
647 | template |
648 | void | |
193a53d9 | 649 | Symbol_table::resolve<64, true>( |
1564db8d | 650 | Sized_symbol<64>* to, |
193a53d9 | 651 | const elfcpp::Sym<64, true>& sym, |
14b31740 ILT |
652 | Object* object, |
653 | const char* version); | |
193a53d9 | 654 | #endif |
14bfc3f5 | 655 | |
86f2e683 ILT |
656 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
657 | template | |
658 | void | |
659 | Sized_symbol<32>::override_with_special(const Sized_symbol<32>*); | |
660 | #endif | |
661 | ||
662 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
663 | template | |
664 | void | |
665 | Sized_symbol<64>::override_with_special(const Sized_symbol<64>*); | |
666 | #endif | |
667 | ||
14bfc3f5 | 668 | } // End namespace gold. |