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(); |
1564db8d ILT |
35 | } |
36 | ||
37 | // Override the fields in Sized_symbol. | |
38 | ||
39 | template<int size> | |
40 | template<bool big_endian> | |
41 | void | |
42 | Sized_symbol<size>::override(const elfcpp::Sym<size, big_endian>& sym, | |
14b31740 | 43 | Object* object, const char* version) |
1564db8d | 44 | { |
14b31740 | 45 | this->override_base(sym, object, version); |
1564db8d | 46 | this->value_ = sym.get_st_value(); |
ead1e424 | 47 | this->symsize_ = sym.get_st_size(); |
1564db8d ILT |
48 | } |
49 | ||
14bfc3f5 ILT |
50 | // Resolve a symbol. This is called the second and subsequent times |
51 | // we see a symbol. TO is the pre-existing symbol. SYM is the new | |
14b31740 | 52 | // symbol, seen in OBJECT. VERSION of the version of SYM. |
14bfc3f5 ILT |
53 | |
54 | template<int size, bool big_endian> | |
55 | void | |
1564db8d | 56 | Symbol_table::resolve(Sized_symbol<size>* to, |
14bfc3f5 | 57 | const elfcpp::Sym<size, big_endian>& sym, |
14b31740 | 58 | Object* object, const char* version) |
14bfc3f5 ILT |
59 | { |
60 | if (object->target()->has_resolve()) | |
61 | { | |
274e99f9 | 62 | Sized_target<size, big_endian>* sized_target; |
593f47df ILT |
63 | sized_target = object->sized_target |
64 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
65 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
14b31740 | 66 | sized_target->resolve(to, sym, object, version); |
14bfc3f5 ILT |
67 | return; |
68 | } | |
69 | ||
70 | // Build a little code for each symbol. | |
71 | // Bit 0: 0 for global, 1 for weak. | |
72 | // Bit 1: 0 for regular object, 1 for shared object | |
73 | // Bits 2-3: 0 for normal, 1 for undefined, 2 for common | |
74 | // This gives us values from 0 to 11: | |
75 | ||
76 | enum | |
77 | { | |
78 | DEF = 0, | |
79 | WEAK_DEF = 1, | |
80 | DYN_DEF = 2, | |
81 | DYN_WEAK_DEF = 3, | |
82 | UNDEF = 4, | |
83 | WEAK_UNDEF = 5, | |
84 | DYN_UNDEF = 6, | |
85 | DYN_WEAK_UNDEF = 7, | |
86 | COMMON = 8, | |
87 | WEAK_COMMON = 9, | |
88 | DYN_COMMON = 10, | |
89 | DYN_WEAK_COMMON = 11 | |
90 | }; | |
91 | ||
92 | int tobits; | |
93 | switch (to->binding()) | |
94 | { | |
95 | case elfcpp::STB_GLOBAL: | |
96 | tobits = 0; | |
97 | break; | |
98 | ||
99 | case elfcpp::STB_WEAK: | |
100 | tobits = 1; | |
101 | break; | |
102 | ||
103 | case elfcpp::STB_LOCAL: | |
104 | // We should only see externally visible symbols in the symbol | |
105 | // table. | |
a3ad94ed | 106 | gold_unreachable(); |
14bfc3f5 ILT |
107 | |
108 | default: | |
109 | // Any target which wants to handle STB_LOOS, etc., needs to | |
110 | // define a resolve method. | |
a3ad94ed | 111 | gold_unreachable(); |
14bfc3f5 ILT |
112 | } |
113 | ||
c06b7b0b ILT |
114 | if (to->source() == Symbol::FROM_OBJECT |
115 | && to->object()->is_dynamic()) | |
14bfc3f5 ILT |
116 | tobits |= (1 << 1); |
117 | ||
16649710 | 118 | switch (to->shndx()) |
14bfc3f5 ILT |
119 | { |
120 | case elfcpp::SHN_UNDEF: | |
121 | tobits |= (1 << 2); | |
122 | break; | |
123 | ||
124 | case elfcpp::SHN_COMMON: | |
125 | tobits |= (2 << 2); | |
126 | break; | |
127 | ||
128 | default: | |
1564db8d ILT |
129 | if (to->type() == elfcpp::STT_COMMON) |
130 | tobits |= (2 << 2); | |
14bfc3f5 ILT |
131 | break; |
132 | } | |
133 | ||
134 | int frombits; | |
135 | switch (sym.get_st_bind()) | |
136 | { | |
137 | case elfcpp::STB_GLOBAL: | |
138 | frombits = 0; | |
139 | break; | |
140 | ||
141 | case elfcpp::STB_WEAK: | |
142 | frombits = 1; | |
143 | break; | |
144 | ||
145 | case elfcpp::STB_LOCAL: | |
146 | fprintf(stderr, | |
147 | _("%s: %s: invalid STB_LOCAL symbol %s in external symbols\n"), | |
148 | program_name, object->name().c_str(), to->name()); | |
149 | gold_exit(false); | |
150 | ||
151 | default: | |
152 | fprintf(stderr, | |
153 | _("%s: %s: unsupported symbol binding %d for symbol %s\n"), | |
154 | program_name, object->name().c_str(), | |
155 | static_cast<int>(sym.get_st_bind()), to->name()); | |
156 | gold_exit(false); | |
157 | } | |
158 | ||
008db82e ILT |
159 | if (!object->is_dynamic()) |
160 | { | |
161 | // Record that we've seen this symbol in a regular object. | |
162 | to->set_in_reg(); | |
163 | } | |
164 | else | |
1564db8d ILT |
165 | { |
166 | frombits |= (1 << 1); | |
167 | ||
168 | // Record that we've seen this symbol in a dynamic object. | |
169 | to->set_in_dyn(); | |
170 | } | |
14bfc3f5 ILT |
171 | |
172 | switch (sym.get_st_shndx()) | |
173 | { | |
174 | case elfcpp::SHN_UNDEF: | |
175 | frombits |= (1 << 2); | |
176 | break; | |
177 | ||
178 | case elfcpp::SHN_COMMON: | |
179 | frombits |= (2 << 2); | |
180 | break; | |
181 | ||
182 | default: | |
1564db8d ILT |
183 | if (sym.get_st_type() == elfcpp::STT_COMMON) |
184 | frombits |= (2 << 2); | |
14bfc3f5 ILT |
185 | break; |
186 | } | |
187 | ||
c06b7b0b ILT |
188 | if ((tobits & (1 << 1)) != (frombits & (1 << 1))) |
189 | { | |
190 | // This symbol is seen in both a dynamic object and a regular | |
191 | // object. That means that we need the symbol to go into the | |
192 | // dynamic symbol table, so that the dynamic linker can use the | |
193 | // regular symbol to override or define the dynamic symbol. | |
194 | to->set_needs_dynsym_entry(); | |
195 | } | |
196 | ||
1564db8d ILT |
197 | // FIXME: Warn if either but not both of TO and SYM are STT_TLS. |
198 | ||
14bfc3f5 ILT |
199 | // We use a giant switch table for symbol resolution. This code is |
200 | // unwieldy, but: 1) it is efficient; 2) we definitely handle all | |
201 | // cases; 3) it is easy to change the handling of a particular case. | |
202 | // The alternative would be a series of conditionals, but it is easy | |
203 | // to get the ordering wrong. This could also be done as a table, | |
204 | // but that is no easier to understand than this large switch | |
205 | // statement. | |
206 | ||
207 | switch (tobits * 16 + frombits) | |
208 | { | |
209 | case DEF * 16 + DEF: | |
12e14209 ILT |
210 | // Two definitions of the same symbol. |
211 | fprintf(stderr, "%s: %s: multiple definition of %s\n", | |
212 | program_name, object->name().c_str(), to->name()); | |
213 | // FIXME: Report locations. Record that we have seen an error. | |
14bfc3f5 ILT |
214 | return; |
215 | ||
216 | case WEAK_DEF * 16 + DEF: | |
1564db8d ILT |
217 | // We've seen a weak definition, and now we see a strong |
218 | // definition. In the original SVR4 linker, this was treated as | |
219 | // a multiple definition error. In the Solaris linker and the | |
220 | // GNU linker, a weak definition followed by a regular | |
221 | // definition causes the weak definition to be overridden. We | |
222 | // are currently compatible with the GNU linker. In the future | |
223 | // we should add a target specific option to change this. | |
224 | // FIXME. | |
14b31740 | 225 | to->override(sym, object, version); |
14bfc3f5 ILT |
226 | return; |
227 | ||
228 | case DYN_DEF * 16 + DEF: | |
229 | case DYN_WEAK_DEF * 16 + DEF: | |
1564db8d ILT |
230 | // We've seen a definition in a dynamic object, and now we see a |
231 | // definition in a regular object. The definition in the | |
232 | // regular object overrides the definition in the dynamic | |
233 | // object. | |
14b31740 | 234 | to->override(sym, object, version); |
1564db8d ILT |
235 | return; |
236 | ||
14bfc3f5 ILT |
237 | case UNDEF * 16 + DEF: |
238 | case WEAK_UNDEF * 16 + DEF: | |
239 | case DYN_UNDEF * 16 + DEF: | |
240 | case DYN_WEAK_UNDEF * 16 + DEF: | |
1564db8d ILT |
241 | // We've seen an undefined reference, and now we see a |
242 | // definition. We use the definition. | |
14b31740 | 243 | to->override(sym, object, version); |
1564db8d ILT |
244 | return; |
245 | ||
14bfc3f5 ILT |
246 | case COMMON * 16 + DEF: |
247 | case WEAK_COMMON * 16 + DEF: | |
248 | case DYN_COMMON * 16 + DEF: | |
249 | case DYN_WEAK_COMMON * 16 + DEF: | |
1564db8d | 250 | // We've seen a common symbol and now we see a definition. The |
14b31740 | 251 | // definition overrides. FIXME: We should optionally issue, version a |
1564db8d | 252 | // warning. |
14b31740 | 253 | to->override(sym, object, version); |
1564db8d | 254 | return; |
14bfc3f5 ILT |
255 | |
256 | case DEF * 16 + WEAK_DEF: | |
257 | case WEAK_DEF * 16 + WEAK_DEF: | |
1564db8d ILT |
258 | // We've seen a definition and now we see a weak definition. We |
259 | // ignore the new weak definition. | |
260 | return; | |
261 | ||
14bfc3f5 ILT |
262 | case DYN_DEF * 16 + WEAK_DEF: |
263 | case DYN_WEAK_DEF * 16 + WEAK_DEF: | |
1564db8d ILT |
264 | // We've seen a dynamic definition and now we see a regular weak |
265 | // definition. The regular weak definition overrides. | |
14b31740 | 266 | to->override(sym, object, version); |
1564db8d ILT |
267 | return; |
268 | ||
14bfc3f5 ILT |
269 | case UNDEF * 16 + WEAK_DEF: |
270 | case WEAK_UNDEF * 16 + WEAK_DEF: | |
271 | case DYN_UNDEF * 16 + WEAK_DEF: | |
272 | case DYN_WEAK_UNDEF * 16 + WEAK_DEF: | |
1564db8d | 273 | // A weak definition of a currently undefined symbol. |
14b31740 | 274 | to->override(sym, object, version); |
1564db8d ILT |
275 | return; |
276 | ||
14bfc3f5 ILT |
277 | case COMMON * 16 + WEAK_DEF: |
278 | case WEAK_COMMON * 16 + WEAK_DEF: | |
1564db8d ILT |
279 | // A weak definition does not override a common definition. |
280 | return; | |
281 | ||
14bfc3f5 ILT |
282 | case DYN_COMMON * 16 + WEAK_DEF: |
283 | case DYN_WEAK_COMMON * 16 + WEAK_DEF: | |
1564db8d ILT |
284 | // A weak definition does override a definition in a dynamic |
285 | // object. FIXME: We should optionally issue a warning. | |
14b31740 | 286 | to->override(sym, object, version); |
1564db8d | 287 | return; |
14bfc3f5 ILT |
288 | |
289 | case DEF * 16 + DYN_DEF: | |
290 | case WEAK_DEF * 16 + DYN_DEF: | |
291 | case DYN_DEF * 16 + DYN_DEF: | |
292 | case DYN_WEAK_DEF * 16 + DYN_DEF: | |
1564db8d ILT |
293 | // Ignore a dynamic definition if we already have a definition. |
294 | return; | |
295 | ||
14bfc3f5 ILT |
296 | case UNDEF * 16 + DYN_DEF: |
297 | case WEAK_UNDEF * 16 + DYN_DEF: | |
298 | case DYN_UNDEF * 16 + DYN_DEF: | |
299 | case DYN_WEAK_UNDEF * 16 + DYN_DEF: | |
1564db8d | 300 | // Use a dynamic definition if we have a reference. |
14b31740 | 301 | to->override(sym, object, version); |
1564db8d ILT |
302 | return; |
303 | ||
14bfc3f5 ILT |
304 | case COMMON * 16 + DYN_DEF: |
305 | case WEAK_COMMON * 16 + DYN_DEF: | |
306 | case DYN_COMMON * 16 + DYN_DEF: | |
307 | case DYN_WEAK_COMMON * 16 + DYN_DEF: | |
1564db8d ILT |
308 | // Ignore a dynamic definition if we already have a common |
309 | // definition. | |
310 | return; | |
14bfc3f5 ILT |
311 | |
312 | case DEF * 16 + DYN_WEAK_DEF: | |
313 | case WEAK_DEF * 16 + DYN_WEAK_DEF: | |
314 | case DYN_DEF * 16 + DYN_WEAK_DEF: | |
315 | case DYN_WEAK_DEF * 16 + DYN_WEAK_DEF: | |
1564db8d ILT |
316 | // Ignore a weak dynamic definition if we already have a |
317 | // definition. | |
318 | return; | |
319 | ||
14bfc3f5 ILT |
320 | case UNDEF * 16 + DYN_WEAK_DEF: |
321 | case WEAK_UNDEF * 16 + DYN_WEAK_DEF: | |
322 | case DYN_UNDEF * 16 + DYN_WEAK_DEF: | |
323 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_DEF: | |
1564db8d | 324 | // Use a weak dynamic definition if we have a reference. |
14b31740 | 325 | to->override(sym, object, version); |
1564db8d ILT |
326 | return; |
327 | ||
14bfc3f5 ILT |
328 | case COMMON * 16 + DYN_WEAK_DEF: |
329 | case WEAK_COMMON * 16 + DYN_WEAK_DEF: | |
330 | case DYN_COMMON * 16 + DYN_WEAK_DEF: | |
331 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_DEF: | |
1564db8d ILT |
332 | // Ignore a weak dynamic definition if we already have a common |
333 | // definition. | |
334 | return; | |
14bfc3f5 ILT |
335 | |
336 | case DEF * 16 + UNDEF: | |
337 | case WEAK_DEF * 16 + UNDEF: | |
338 | case DYN_DEF * 16 + UNDEF: | |
339 | case DYN_WEAK_DEF * 16 + UNDEF: | |
340 | case UNDEF * 16 + UNDEF: | |
ead1e424 ILT |
341 | // A new undefined reference tells us nothing. |
342 | return; | |
343 | ||
14bfc3f5 ILT |
344 | case WEAK_UNDEF * 16 + UNDEF: |
345 | case DYN_UNDEF * 16 + UNDEF: | |
346 | case DYN_WEAK_UNDEF * 16 + UNDEF: | |
ead1e424 | 347 | // A strong undef overrides a dynamic or weak undef. |
14b31740 | 348 | to->override(sym, object, version); |
ead1e424 ILT |
349 | return; |
350 | ||
14bfc3f5 ILT |
351 | case COMMON * 16 + UNDEF: |
352 | case WEAK_COMMON * 16 + UNDEF: | |
353 | case DYN_COMMON * 16 + UNDEF: | |
354 | case DYN_WEAK_COMMON * 16 + UNDEF: | |
1564db8d ILT |
355 | // A new undefined reference tells us nothing. |
356 | return; | |
14bfc3f5 ILT |
357 | |
358 | case DEF * 16 + WEAK_UNDEF: | |
359 | case WEAK_DEF * 16 + WEAK_UNDEF: | |
360 | case DYN_DEF * 16 + WEAK_UNDEF: | |
361 | case DYN_WEAK_DEF * 16 + WEAK_UNDEF: | |
362 | case UNDEF * 16 + WEAK_UNDEF: | |
363 | case WEAK_UNDEF * 16 + WEAK_UNDEF: | |
364 | case DYN_UNDEF * 16 + WEAK_UNDEF: | |
365 | case DYN_WEAK_UNDEF * 16 + WEAK_UNDEF: | |
366 | case COMMON * 16 + WEAK_UNDEF: | |
367 | case WEAK_COMMON * 16 + WEAK_UNDEF: | |
368 | case DYN_COMMON * 16 + WEAK_UNDEF: | |
369 | case DYN_WEAK_COMMON * 16 + WEAK_UNDEF: | |
1564db8d ILT |
370 | // A new weak undefined reference tells us nothing. |
371 | return; | |
14bfc3f5 ILT |
372 | |
373 | case DEF * 16 + DYN_UNDEF: | |
374 | case WEAK_DEF * 16 + DYN_UNDEF: | |
375 | case DYN_DEF * 16 + DYN_UNDEF: | |
376 | case DYN_WEAK_DEF * 16 + DYN_UNDEF: | |
377 | case UNDEF * 16 + DYN_UNDEF: | |
378 | case WEAK_UNDEF * 16 + DYN_UNDEF: | |
379 | case DYN_UNDEF * 16 + DYN_UNDEF: | |
380 | case DYN_WEAK_UNDEF * 16 + DYN_UNDEF: | |
381 | case COMMON * 16 + DYN_UNDEF: | |
382 | case WEAK_COMMON * 16 + DYN_UNDEF: | |
383 | case DYN_COMMON * 16 + DYN_UNDEF: | |
384 | case DYN_WEAK_COMMON * 16 + DYN_UNDEF: | |
1564db8d ILT |
385 | // A new dynamic undefined reference tells us nothing. |
386 | return; | |
14bfc3f5 ILT |
387 | |
388 | case DEF * 16 + DYN_WEAK_UNDEF: | |
389 | case WEAK_DEF * 16 + DYN_WEAK_UNDEF: | |
390 | case DYN_DEF * 16 + DYN_WEAK_UNDEF: | |
391 | case DYN_WEAK_DEF * 16 + DYN_WEAK_UNDEF: | |
392 | case UNDEF * 16 + DYN_WEAK_UNDEF: | |
393 | case WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: | |
394 | case DYN_UNDEF * 16 + DYN_WEAK_UNDEF: | |
395 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_UNDEF: | |
396 | case COMMON * 16 + DYN_WEAK_UNDEF: | |
397 | case WEAK_COMMON * 16 + DYN_WEAK_UNDEF: | |
398 | case DYN_COMMON * 16 + DYN_WEAK_UNDEF: | |
399 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_UNDEF: | |
1564db8d ILT |
400 | // A new weak dynamic undefined reference tells us nothing. |
401 | return; | |
14bfc3f5 ILT |
402 | |
403 | case DEF * 16 + COMMON: | |
1564db8d ILT |
404 | // A common symbol does not override a definition. |
405 | return; | |
406 | ||
14bfc3f5 ILT |
407 | case WEAK_DEF * 16 + COMMON: |
408 | case DYN_DEF * 16 + COMMON: | |
409 | case DYN_WEAK_DEF * 16 + COMMON: | |
1564db8d ILT |
410 | // A common symbol does override a weak definition or a dynamic |
411 | // definition. | |
14b31740 | 412 | to->override(sym, object, version); |
1564db8d ILT |
413 | return; |
414 | ||
14bfc3f5 ILT |
415 | case UNDEF * 16 + COMMON: |
416 | case WEAK_UNDEF * 16 + COMMON: | |
417 | case DYN_UNDEF * 16 + COMMON: | |
418 | case DYN_WEAK_UNDEF * 16 + COMMON: | |
1564db8d | 419 | // A common symbol is a definition for a reference. |
14b31740 | 420 | to->override(sym, object, version); |
1564db8d ILT |
421 | return; |
422 | ||
14bfc3f5 | 423 | case COMMON * 16 + COMMON: |
ead1e424 ILT |
424 | // Set the size to the maximum. |
425 | if (sym.get_st_size() > to->symsize()) | |
426 | to->set_symsize(sym.get_st_size()); | |
427 | return; | |
428 | ||
14bfc3f5 | 429 | case WEAK_COMMON * 16 + COMMON: |
ead1e424 ILT |
430 | // I'm not sure just what a weak common symbol means, but |
431 | // presumably it can be overridden by a regular common symbol. | |
14b31740 | 432 | to->override(sym, object, version); |
ead1e424 ILT |
433 | return; |
434 | ||
14bfc3f5 ILT |
435 | case DYN_COMMON * 16 + COMMON: |
436 | case DYN_WEAK_COMMON * 16 + COMMON: | |
ead1e424 ILT |
437 | { |
438 | // Use the real common symbol, but adjust the size if necessary. | |
439 | typename Sized_symbol<size>::Size_type symsize = to->symsize(); | |
14b31740 | 440 | to->override(sym, object, version); |
ead1e424 ILT |
441 | if (to->symsize() < symsize) |
442 | to->set_symsize(symsize); | |
443 | } | |
444 | return; | |
14bfc3f5 ILT |
445 | |
446 | case DEF * 16 + WEAK_COMMON: | |
447 | case WEAK_DEF * 16 + WEAK_COMMON: | |
448 | case DYN_DEF * 16 + WEAK_COMMON: | |
449 | case DYN_WEAK_DEF * 16 + WEAK_COMMON: | |
ead1e424 ILT |
450 | // Whatever a weak common symbol is, it won't override a |
451 | // definition. | |
452 | return; | |
453 | ||
14bfc3f5 ILT |
454 | case UNDEF * 16 + WEAK_COMMON: |
455 | case WEAK_UNDEF * 16 + WEAK_COMMON: | |
456 | case DYN_UNDEF * 16 + WEAK_COMMON: | |
457 | case DYN_WEAK_UNDEF * 16 + WEAK_COMMON: | |
ead1e424 | 458 | // A weak common symbol is better than an undefined symbol. |
14b31740 | 459 | to->override(sym, object, version); |
ead1e424 ILT |
460 | return; |
461 | ||
14bfc3f5 ILT |
462 | case COMMON * 16 + WEAK_COMMON: |
463 | case WEAK_COMMON * 16 + WEAK_COMMON: | |
464 | case DYN_COMMON * 16 + WEAK_COMMON: | |
465 | case DYN_WEAK_COMMON * 16 + WEAK_COMMON: | |
ead1e424 ILT |
466 | // Ignore a weak common symbol in the presence of a real common |
467 | // symbol. | |
468 | return; | |
14bfc3f5 ILT |
469 | |
470 | case DEF * 16 + DYN_COMMON: | |
471 | case WEAK_DEF * 16 + DYN_COMMON: | |
472 | case DYN_DEF * 16 + DYN_COMMON: | |
473 | case DYN_WEAK_DEF * 16 + DYN_COMMON: | |
ead1e424 ILT |
474 | // Ignore a dynamic common symbol in the presence of a |
475 | // definition. | |
476 | return; | |
477 | ||
14bfc3f5 ILT |
478 | case UNDEF * 16 + DYN_COMMON: |
479 | case WEAK_UNDEF * 16 + DYN_COMMON: | |
480 | case DYN_UNDEF * 16 + DYN_COMMON: | |
481 | case DYN_WEAK_UNDEF * 16 + DYN_COMMON: | |
ead1e424 | 482 | // A dynamic common symbol is a definition of sorts. |
14b31740 | 483 | to->override(sym, object, version); |
ead1e424 ILT |
484 | return; |
485 | ||
14bfc3f5 ILT |
486 | case COMMON * 16 + DYN_COMMON: |
487 | case WEAK_COMMON * 16 + DYN_COMMON: | |
488 | case DYN_COMMON * 16 + DYN_COMMON: | |
489 | case DYN_WEAK_COMMON * 16 + DYN_COMMON: | |
ead1e424 ILT |
490 | // Set the size to the maximum. |
491 | if (sym.get_st_size() > to->symsize()) | |
492 | to->set_symsize(sym.get_st_size()); | |
493 | return; | |
14bfc3f5 ILT |
494 | |
495 | case DEF * 16 + DYN_WEAK_COMMON: | |
496 | case WEAK_DEF * 16 + DYN_WEAK_COMMON: | |
497 | case DYN_DEF * 16 + DYN_WEAK_COMMON: | |
498 | case DYN_WEAK_DEF * 16 + DYN_WEAK_COMMON: | |
ead1e424 ILT |
499 | // A common symbol is ignored in the face of a definition. |
500 | return; | |
501 | ||
14bfc3f5 ILT |
502 | case UNDEF * 16 + DYN_WEAK_COMMON: |
503 | case WEAK_UNDEF * 16 + DYN_WEAK_COMMON: | |
504 | case DYN_UNDEF * 16 + DYN_WEAK_COMMON: | |
505 | case DYN_WEAK_UNDEF * 16 + DYN_WEAK_COMMON: | |
ead1e424 | 506 | // I guess a weak common symbol is better than a definition. |
14b31740 | 507 | to->override(sym, object, version); |
ead1e424 ILT |
508 | return; |
509 | ||
14bfc3f5 ILT |
510 | case COMMON * 16 + DYN_WEAK_COMMON: |
511 | case WEAK_COMMON * 16 + DYN_WEAK_COMMON: | |
512 | case DYN_COMMON * 16 + DYN_WEAK_COMMON: | |
513 | case DYN_WEAK_COMMON * 16 + DYN_WEAK_COMMON: | |
ead1e424 ILT |
514 | // Set the size to the maximum. |
515 | if (sym.get_st_size() > to->symsize()) | |
516 | to->set_symsize(sym.get_st_size()); | |
517 | return; | |
1564db8d ILT |
518 | |
519 | default: | |
a3ad94ed | 520 | gold_unreachable(); |
14bfc3f5 ILT |
521 | } |
522 | } | |
523 | ||
524 | // Instantiate the templates we need. We could use the configure | |
525 | // script to restrict this to only the ones needed for implemented | |
526 | // targets. | |
527 | ||
528 | template | |
529 | void | |
530 | Symbol_table::resolve<32, true>( | |
1564db8d | 531 | Sized_symbol<32>* to, |
14bfc3f5 | 532 | const elfcpp::Sym<32, true>& sym, |
14b31740 ILT |
533 | Object* object, |
534 | const char* version); | |
14bfc3f5 ILT |
535 | |
536 | template | |
537 | void | |
538 | Symbol_table::resolve<32, false>( | |
1564db8d | 539 | Sized_symbol<32>* to, |
14bfc3f5 | 540 | const elfcpp::Sym<32, false>& sym, |
14b31740 ILT |
541 | Object* object, |
542 | const char* version); | |
14bfc3f5 ILT |
543 | |
544 | template | |
545 | void | |
546 | Symbol_table::resolve<64, true>( | |
1564db8d | 547 | Sized_symbol<64>* to, |
14bfc3f5 | 548 | const elfcpp::Sym<64, true>& sym, |
14b31740 ILT |
549 | Object* object, |
550 | const char* version); | |
14bfc3f5 ILT |
551 | |
552 | template | |
553 | void | |
554 | Symbol_table::resolve<64, false>( | |
1564db8d | 555 | Sized_symbol<64>* to, |
14bfc3f5 | 556 | const elfcpp::Sym<64, false>& sym, |
14b31740 ILT |
557 | Object* object, |
558 | const char* version); | |
14bfc3f5 ILT |
559 | |
560 | } // End namespace gold. |