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bae7f79e ILT |
1 | // object.h -- support for an object file for linking in gold -*- C++ -*- |
2 | ||
3 | #ifndef GOLD_OBJECT_H | |
4 | #define GOLD_OBJECT_H | |
5 | ||
92e059d8 | 6 | #include <string> |
a2fb1b05 | 7 | #include <vector> |
14bfc3f5 | 8 | |
bae7f79e | 9 | #include "elfcpp.h" |
645f8123 | 10 | #include "elfcpp_file.h" |
bae7f79e | 11 | #include "fileread.h" |
14bfc3f5 | 12 | #include "target.h" |
bae7f79e ILT |
13 | |
14 | namespace gold | |
15 | { | |
16 | ||
92e059d8 | 17 | class General_options; |
a2fb1b05 | 18 | class Layout; |
61ba1cf9 ILT |
19 | class Output_section; |
20 | class Output_file; | |
f6ce93d6 | 21 | class Dynobj; |
a2fb1b05 | 22 | |
b8e6aad9 ILT |
23 | template<typename Stringpool_char> |
24 | class Stringpool_template; | |
25 | ||
bae7f79e ILT |
26 | // Data to pass from read_symbols() to add_symbols(). |
27 | ||
28 | struct Read_symbols_data | |
29 | { | |
12e14209 ILT |
30 | // Section headers. |
31 | File_view* section_headers; | |
32 | // Section names. | |
33 | File_view* section_names; | |
34 | // Size of section name data in bytes. | |
35 | off_t section_names_size; | |
bae7f79e ILT |
36 | // Symbol data. |
37 | File_view* symbols; | |
38 | // Size of symbol data in bytes. | |
39 | off_t symbols_size; | |
40 | // Symbol names. | |
41 | File_view* symbol_names; | |
42 | // Size of symbol name data in bytes. | |
43 | off_t symbol_names_size; | |
dbe717ef ILT |
44 | |
45 | // Version information. This is only used on dynamic objects. | |
46 | // Version symbol data (from SHT_GNU_versym section). | |
47 | File_view* versym; | |
48 | off_t versym_size; | |
49 | // Version definition data (from SHT_GNU_verdef section). | |
50 | File_view* verdef; | |
51 | off_t verdef_size; | |
52 | unsigned int verdef_info; | |
53 | // Needed version data (from SHT_GNU_verneed section). | |
54 | File_view* verneed; | |
55 | off_t verneed_size; | |
56 | unsigned int verneed_info; | |
bae7f79e ILT |
57 | }; |
58 | ||
92e059d8 ILT |
59 | // Data about a single relocation section. This is read in |
60 | // read_relocs and processed in scan_relocs. | |
61 | ||
62 | struct Section_relocs | |
63 | { | |
64 | // Index of reloc section. | |
65 | unsigned int reloc_shndx; | |
66 | // Index of section that relocs apply to. | |
67 | unsigned int data_shndx; | |
68 | // Contents of reloc section. | |
69 | File_view* contents; | |
70 | // Reloc section type. | |
71 | unsigned int sh_type; | |
72 | // Number of reloc entries. | |
73 | size_t reloc_count; | |
74 | }; | |
75 | ||
76 | // Relocations in an object file. This is read in read_relocs and | |
77 | // processed in scan_relocs. | |
78 | ||
79 | struct Read_relocs_data | |
80 | { | |
81 | typedef std::vector<Section_relocs> Relocs_list; | |
82 | // The relocations. | |
83 | Relocs_list relocs; | |
84 | // The local symbols. | |
85 | File_view* local_symbols; | |
86 | }; | |
87 | ||
f6ce93d6 ILT |
88 | // Object is an abstract base class which represents either a 32-bit |
89 | // or a 64-bit input object. This can be a regular object file | |
90 | // (ET_REL) or a shared object (ET_DYN). | |
bae7f79e ILT |
91 | |
92 | class Object | |
93 | { | |
94 | public: | |
95 | // NAME is the name of the object as we would report it to the user | |
96 | // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is | |
97 | // used to read the file. OFFSET is the offset within the input | |
98 | // file--0 for a .o or .so file, something else for a .a file. | |
14bfc3f5 ILT |
99 | Object(const std::string& name, Input_file* input_file, bool is_dynamic, |
100 | off_t offset = 0) | |
dbe717ef | 101 | : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U), |
f6ce93d6 | 102 | is_dynamic_(is_dynamic), target_(NULL) |
bae7f79e ILT |
103 | { } |
104 | ||
105 | virtual ~Object() | |
106 | { } | |
107 | ||
14bfc3f5 | 108 | // Return the name of the object as we would report it to the tuser. |
bae7f79e ILT |
109 | const std::string& |
110 | name() const | |
111 | { return this->name_; } | |
112 | ||
14bfc3f5 ILT |
113 | // Return whether this is a dynamic object. |
114 | bool | |
115 | is_dynamic() const | |
116 | { return this->is_dynamic_; } | |
117 | ||
14bfc3f5 ILT |
118 | // Return the target structure associated with this object. |
119 | Target* | |
a2fb1b05 | 120 | target() const |
14bfc3f5 ILT |
121 | { return this->target_; } |
122 | ||
a2fb1b05 ILT |
123 | // Lock the underlying file. |
124 | void | |
125 | lock() | |
126 | { this->input_file_->file().lock(); } | |
127 | ||
128 | // Unlock the underlying file. | |
129 | void | |
130 | unlock() | |
131 | { this->input_file_->file().unlock(); } | |
132 | ||
133 | // Return whether the underlying file is locked. | |
134 | bool | |
135 | is_locked() const | |
136 | { return this->input_file_->file().is_locked(); } | |
137 | ||
14bfc3f5 ILT |
138 | // Return the sized target structure associated with this object. |
139 | // This is like the target method but it returns a pointer of | |
140 | // appropriate checked type. | |
141 | template<int size, bool big_endian> | |
142 | Sized_target<size, big_endian>* | |
5482377d | 143 | sized_target(ACCEPT_SIZE_ENDIAN_ONLY); |
bae7f79e | 144 | |
5a6f7e2d ILT |
145 | // Get the number of sections. |
146 | unsigned int | |
147 | shnum() const | |
148 | { return this->shnum_; } | |
a2fb1b05 | 149 | |
f6ce93d6 ILT |
150 | // Return a view of the contents of a section. Set *PLEN to the |
151 | // size. | |
152 | const unsigned char* | |
645f8123 | 153 | section_contents(unsigned int shndx, off_t* plen); |
f6ce93d6 ILT |
154 | |
155 | // Return the name of a section given a section index. This is only | |
156 | // used for error messages. | |
157 | std::string | |
a3ad94ed ILT |
158 | section_name(unsigned int shndx) |
159 | { return this->do_section_name(shndx); } | |
160 | ||
161 | // Return the section flags given a section index. | |
162 | uint64_t | |
163 | section_flags(unsigned int shndx) | |
164 | { return this->do_section_flags(shndx); } | |
f6ce93d6 | 165 | |
5a6f7e2d ILT |
166 | // Read the symbol information. |
167 | void | |
168 | read_symbols(Read_symbols_data* sd) | |
169 | { return this->do_read_symbols(sd); } | |
170 | ||
171 | // Pass sections which should be included in the link to the Layout | |
172 | // object, and record where the sections go in the output file. | |
173 | void | |
174 | layout(const General_options& options, Symbol_table* symtab, | |
175 | Layout* layout, Read_symbols_data* sd) | |
176 | { this->do_layout(options, symtab, layout, sd); } | |
177 | ||
178 | // Add symbol information to the global symbol table. | |
179 | void | |
180 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
181 | { this->do_add_symbols(symtab, sd); } | |
182 | ||
645f8123 ILT |
183 | // Functions and types for the elfcpp::Elf_file interface. This |
184 | // permit us to use Object as the File template parameter for | |
185 | // elfcpp::Elf_file. | |
186 | ||
187 | // The View class is returned by view. It must support a single | |
188 | // method, data(). This is trivial, because get_view does what we | |
189 | // need. | |
190 | class View | |
191 | { | |
192 | public: | |
193 | View(const unsigned char* p) | |
194 | : p_(p) | |
195 | { } | |
196 | ||
197 | const unsigned char* | |
198 | data() const | |
199 | { return this->p_; } | |
200 | ||
201 | private: | |
202 | const unsigned char* p_; | |
203 | }; | |
204 | ||
205 | // Return a View. | |
206 | View | |
207 | view(off_t file_offset, off_t data_size) | |
208 | { return View(this->get_view(file_offset, data_size)); } | |
209 | ||
210 | // Report an error. | |
211 | void | |
212 | error(const char* format, ...) ATTRIBUTE_PRINTF_2; | |
213 | ||
214 | // A location in the file. | |
215 | struct Location | |
216 | { | |
217 | off_t file_offset; | |
218 | off_t data_size; | |
219 | ||
220 | Location(off_t fo, off_t ds) | |
221 | : file_offset(fo), data_size(ds) | |
222 | { } | |
223 | }; | |
224 | ||
225 | // Get a View given a Location. | |
226 | View view(Location loc) | |
227 | { return View(this->get_view(loc.file_offset, loc.data_size)); } | |
228 | ||
f6ce93d6 ILT |
229 | protected: |
230 | // Read the symbols--implemented by child class. | |
231 | virtual void | |
232 | do_read_symbols(Read_symbols_data*) = 0; | |
233 | ||
234 | // Lay out sections--implemented by child class. | |
235 | virtual void | |
236 | do_layout(const General_options&, Symbol_table*, Layout*, | |
237 | Read_symbols_data*) = 0; | |
238 | ||
239 | // Add symbol information to the global symbol table--implemented by | |
240 | // child class. | |
241 | virtual void | |
242 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
243 | ||
645f8123 ILT |
244 | // Return the location of the contents of a section. Implemented by |
245 | // child class. | |
246 | virtual Location | |
a3ad94ed | 247 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 ILT |
248 | |
249 | // Get the name of a section--implemented by child class. | |
250 | virtual std::string | |
a3ad94ed ILT |
251 | do_section_name(unsigned int shndx) = 0; |
252 | ||
253 | // Get section flags--implemented by child class. | |
254 | virtual uint64_t | |
255 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 ILT |
256 | |
257 | // Get the file. | |
258 | Input_file* | |
259 | input_file() const | |
260 | { return this->input_file_; } | |
261 | ||
262 | // Get the offset into the file. | |
263 | off_t | |
264 | offset() const | |
265 | { return this->offset_; } | |
266 | ||
267 | // Get a view into the underlying file. | |
268 | const unsigned char* | |
269 | get_view(off_t start, off_t size) | |
270 | { return this->input_file_->file().get_view(start + this->offset_, size); } | |
271 | ||
272 | // Get a lasting view into the underlying file. | |
273 | File_view* | |
274 | get_lasting_view(off_t start, off_t size) | |
275 | { | |
276 | return this->input_file_->file().get_lasting_view(start + this->offset_, | |
277 | size); | |
278 | } | |
279 | ||
280 | // Read data from the underlying file. | |
281 | void | |
282 | read(off_t start, off_t size, void* p) | |
283 | { this->input_file_->file().read(start + this->offset_, size, p); } | |
284 | ||
285 | // Set the target. | |
286 | void | |
dbe717ef ILT |
287 | set_target(int machine, int size, bool big_endian, int osabi, |
288 | int abiversion); | |
289 | ||
dbe717ef ILT |
290 | // Set the number of sections. |
291 | void | |
292 | set_shnum(int shnum) | |
293 | { this->shnum_ = shnum; } | |
294 | ||
295 | // Functions used by both Sized_relobj and Sized_dynobj. | |
296 | ||
297 | // Read the section data into a Read_symbols_data object. | |
298 | template<int size, bool big_endian> | |
299 | void | |
300 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
301 | Read_symbols_data*); | |
302 | ||
303 | // If NAME is the name of a special .gnu.warning section, arrange | |
304 | // for the warning to be issued. SHNDX is the section index. | |
305 | // Return whether it is a warning section. | |
306 | bool | |
307 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
308 | Symbol_table*); | |
f6ce93d6 ILT |
309 | |
310 | private: | |
311 | // This class may not be copied. | |
312 | Object(const Object&); | |
313 | Object& operator=(const Object&); | |
314 | ||
315 | // Name of object as printed to user. | |
316 | std::string name_; | |
317 | // For reading the file. | |
318 | Input_file* input_file_; | |
319 | // Offset within the file--0 for an object file, non-0 for an | |
320 | // archive. | |
321 | off_t offset_; | |
dbe717ef ILT |
322 | // Number of input sections. |
323 | unsigned int shnum_; | |
f6ce93d6 ILT |
324 | // Whether this is a dynamic object. |
325 | bool is_dynamic_; | |
326 | // Target functions--may be NULL if the target is not known. | |
327 | Target* target_; | |
328 | }; | |
329 | ||
330 | // Implement sized_target inline for efficiency. This approach breaks | |
331 | // static type checking, but is made safe using asserts. | |
332 | ||
333 | template<int size, bool big_endian> | |
334 | inline Sized_target<size, big_endian>* | |
335 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) | |
336 | { | |
a3ad94ed ILT |
337 | gold_assert(this->target_->get_size() == size); |
338 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
339 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
340 | } | |
341 | ||
342 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 343 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
344 | |
345 | class Relobj : public Object | |
346 | { | |
347 | public: | |
348 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
349 | : Object(name, input_file, false, offset) | |
350 | { } | |
351 | ||
92e059d8 | 352 | // Read the relocs. |
a2fb1b05 | 353 | void |
92e059d8 ILT |
354 | read_relocs(Read_relocs_data* rd) |
355 | { return this->do_read_relocs(rd); } | |
356 | ||
357 | // Scan the relocs and adjust the symbol table. | |
358 | void | |
359 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
360 | Layout* layout, Read_relocs_data* rd) |
361 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 362 | |
75f65a3e ILT |
363 | // Initial local symbol processing: set the offset where local |
364 | // symbol information will be stored; add local symbol names to | |
c06b7b0b ILT |
365 | // *POOL; return the new local symbol index. |
366 | unsigned int | |
b8e6aad9 ILT |
367 | finalize_local_symbols(unsigned int index, off_t off, |
368 | Stringpool_template<char>* pool) | |
c06b7b0b | 369 | { return this->do_finalize_local_symbols(index, off, pool); } |
75f65a3e | 370 | |
61ba1cf9 ILT |
371 | // Relocate the input sections and write out the local symbols. |
372 | void | |
373 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
374 | const Layout* layout, Output_file* of) |
375 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 376 | |
a783673b ILT |
377 | // Return whether an input section is being included in the link. |
378 | bool | |
5a6f7e2d | 379 | is_section_included(unsigned int shndx) const |
a783673b | 380 | { |
5a6f7e2d ILT |
381 | gold_assert(shndx < this->map_to_output_.size()); |
382 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
383 | } |
384 | ||
385 | // Given a section index, return the corresponding Output_section | |
386 | // (which will be NULL if the section is not included in the link) | |
387 | // and set *POFF to the offset within that section. | |
388 | inline Output_section* | |
b8e6aad9 | 389 | output_section(unsigned int shndx, off_t* poff) const; |
a783673b | 390 | |
ead1e424 ILT |
391 | // Set the offset of an input section within its output section. |
392 | void | |
393 | set_section_offset(unsigned int shndx, off_t off) | |
394 | { | |
a3ad94ed | 395 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
396 | this->map_to_output_[shndx].offset = off; |
397 | } | |
398 | ||
a783673b | 399 | protected: |
a2fb1b05 ILT |
400 | // What we need to know to map an input section to an output |
401 | // section. We keep an array of these, one for each input section, | |
402 | // indexed by the input section number. | |
403 | struct Map_to_output | |
404 | { | |
405 | // The output section. This is NULL if the input section is to be | |
406 | // discarded. | |
407 | Output_section* output_section; | |
b8e6aad9 ILT |
408 | // The offset within the output section. This is -1 if the |
409 | // section requires special handling. | |
a2fb1b05 ILT |
410 | off_t offset; |
411 | }; | |
412 | ||
92e059d8 ILT |
413 | // Read the relocs--implemented by child class. |
414 | virtual void | |
415 | do_read_relocs(Read_relocs_data*) = 0; | |
416 | ||
417 | // Scan the relocs--implemented by child class. | |
418 | virtual void | |
ead1e424 ILT |
419 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
420 | Read_relocs_data*) = 0; | |
92e059d8 | 421 | |
75f65a3e | 422 | // Finalize local symbols--implemented by child class. |
c06b7b0b | 423 | virtual unsigned int |
b8e6aad9 ILT |
424 | do_finalize_local_symbols(unsigned int, off_t, |
425 | Stringpool_template<char>*) = 0; | |
75f65a3e | 426 | |
61ba1cf9 ILT |
427 | // Relocate the input sections and write out the local |
428 | // symbols--implemented by child class. | |
429 | virtual void | |
430 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
431 | const Layout*, Output_file* of) = 0; |
432 | ||
a2fb1b05 ILT |
433 | // Return the vector mapping input sections to output sections. |
434 | std::vector<Map_to_output>& | |
435 | map_to_output() | |
436 | { return this->map_to_output_; } | |
437 | ||
b8e6aad9 ILT |
438 | const std::vector<Map_to_output>& |
439 | map_to_output() const | |
440 | { return this->map_to_output_; } | |
441 | ||
bae7f79e | 442 | private: |
a2fb1b05 ILT |
443 | // Mapping from input sections to output section. |
444 | std::vector<Map_to_output> map_to_output_; | |
bae7f79e ILT |
445 | }; |
446 | ||
a783673b ILT |
447 | // Implement Object::output_section inline for efficiency. |
448 | inline Output_section* | |
b8e6aad9 | 449 | Relobj::output_section(unsigned int shndx, off_t* poff) const |
a783673b | 450 | { |
5a6f7e2d ILT |
451 | gold_assert(shndx < this->map_to_output_.size()); |
452 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
453 | *poff = mo.offset; |
454 | return mo.output_section; | |
455 | } | |
456 | ||
b8e6aad9 ILT |
457 | // This POD class is holds the value of a symbol. This is used for |
458 | // local symbols, and for all symbols during relocation processing. | |
459 | // In order to process relocs we need to be able to handle SHF_MERGE | |
460 | // sections correctly. | |
461 | ||
462 | template<int size> | |
463 | class Symbol_value | |
464 | { | |
465 | public: | |
466 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
467 | ||
468 | Symbol_value() | |
469 | : output_symtab_index_(0), input_shndx_(0), needs_output_address_(false), | |
470 | value_(0) | |
471 | { } | |
472 | ||
473 | // Get the value of this symbol. OBJECT is the object in which this | |
474 | // symbol is defined, and ADDEND is an addend to add to the value. | |
475 | template<bool big_endian> | |
476 | Value | |
477 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
478 | { | |
479 | if (!this->needs_output_address_) | |
480 | return this->value_ + addend; | |
481 | return object->local_value(this->input_shndx_, this->value_, addend); | |
482 | } | |
483 | ||
484 | // Set the value of this symbol in the output symbol table. | |
485 | void | |
486 | set_output_value(Value value) | |
487 | { | |
488 | this->value_ = value; | |
489 | this->needs_output_address_ = false; | |
490 | } | |
491 | ||
492 | // If this symbol is mapped to an output section which requires | |
493 | // special handling to determine the output value, we store the | |
494 | // value of the symbol in the input file. This is used for | |
495 | // SHF_MERGE sections. | |
496 | void | |
497 | set_input_value(Value value) | |
498 | { | |
499 | this->value_ = value; | |
500 | this->needs_output_address_ = true; | |
501 | } | |
502 | ||
503 | // Return whether this symbol should go into the output symbol | |
504 | // table. | |
505 | bool | |
506 | needs_output_symtab_entry() const | |
507 | { | |
508 | gold_assert(this->output_symtab_index_ != 0); | |
509 | return this->output_symtab_index_ != -1U; | |
510 | } | |
511 | ||
512 | // Return the index in the output symbol table. | |
513 | unsigned int | |
514 | output_symtab_index() const | |
515 | { | |
516 | gold_assert(this->output_symtab_index_ != 0); | |
517 | return this->output_symtab_index_; | |
518 | } | |
519 | ||
520 | // Set the index in the output symbol table. | |
521 | void | |
522 | set_output_symtab_index(unsigned int i) | |
523 | { | |
524 | gold_assert(this->output_symtab_index_ == 0); | |
525 | this->output_symtab_index_ = i; | |
526 | } | |
527 | ||
528 | // Record that this symbol should not go into the output symbol | |
529 | // table. | |
530 | void | |
531 | set_no_output_symtab_entry() | |
532 | { | |
533 | gold_assert(this->output_symtab_index_ == 0); | |
534 | this->output_symtab_index_ = -1U; | |
535 | } | |
536 | ||
537 | // Set the index of the input section in the input file. | |
538 | void | |
539 | set_input_shndx(unsigned int i) | |
540 | { this->input_shndx_ = i; } | |
541 | ||
542 | private: | |
543 | // The index of this local symbol in the output symbol table. This | |
544 | // will be -1 if the symbol should not go into the symbol table. | |
545 | unsigned int output_symtab_index_; | |
546 | // The section index in the input file in which this symbol is | |
547 | // defined. | |
548 | unsigned int input_shndx_ : 31; | |
549 | // Whether getting the value of this symbol requires calling an | |
550 | // Output_section method. For example, this will be true of a | |
551 | // STT_SECTION symbol in a SHF_MERGE section. | |
552 | bool needs_output_address_ : 1; | |
553 | // The value of the symbol. If !needs_output_address_, this is the | |
554 | // value in the output file. If needs_output_address_, this is the | |
555 | // value in the input file. | |
556 | Value value_; | |
557 | }; | |
558 | ||
14bfc3f5 | 559 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
560 | |
561 | template<int size, bool big_endian> | |
f6ce93d6 | 562 | class Sized_relobj : public Relobj |
bae7f79e ILT |
563 | { |
564 | public: | |
c06b7b0b | 565 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
b8e6aad9 | 566 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 567 | |
f6ce93d6 | 568 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
569 | const typename elfcpp::Ehdr<size, big_endian>&); |
570 | ||
f6ce93d6 | 571 | ~Sized_relobj(); |
bae7f79e | 572 | |
a2fb1b05 | 573 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
574 | void |
575 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
576 | ||
c06b7b0b ILT |
577 | // Return the index of local symbol SYM in the ordinary symbol |
578 | // table. A value of -1U means that the symbol is not being output. | |
579 | unsigned int | |
580 | symtab_index(unsigned int sym) const | |
581 | { | |
b8e6aad9 ILT |
582 | gold_assert(sym < this->local_values_.size()); |
583 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
584 | } |
585 | ||
a2fb1b05 | 586 | // Read the symbols. |
bae7f79e | 587 | void |
12e14209 | 588 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 589 | |
dbe717ef ILT |
590 | // Lay out the input sections. |
591 | void | |
592 | do_layout(const General_options&, Symbol_table*, Layout*, | |
593 | Read_symbols_data*); | |
594 | ||
12e14209 ILT |
595 | // Add the symbols to the symbol table. |
596 | void | |
597 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 598 | |
92e059d8 ILT |
599 | // Read the relocs. |
600 | void | |
601 | do_read_relocs(Read_relocs_data*); | |
602 | ||
603 | // Scan the relocs and adjust the symbol table. | |
604 | void | |
ead1e424 ILT |
605 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
606 | Read_relocs_data*); | |
92e059d8 | 607 | |
75f65a3e | 608 | // Finalize the local symbols. |
c06b7b0b | 609 | unsigned int |
b8e6aad9 ILT |
610 | do_finalize_local_symbols(unsigned int, off_t, |
611 | Stringpool_template<char>*); | |
75f65a3e | 612 | |
61ba1cf9 ILT |
613 | // Relocate the input sections and write out the local symbols. |
614 | void | |
615 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
616 | const Layout*, Output_file* of); |
617 | ||
618 | // Get the name of a section. | |
619 | std::string | |
645f8123 ILT |
620 | do_section_name(unsigned int shndx) |
621 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 622 | |
645f8123 | 623 | // Return the location of the contents of a section. |
dbe717ef | 624 | Object::Location |
645f8123 ILT |
625 | do_section_contents(unsigned int shndx) |
626 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 627 | |
a3ad94ed ILT |
628 | // Return section flags. |
629 | uint64_t | |
630 | do_section_flags(unsigned int shndx) | |
631 | { return this->elf_file_.section_flags(shndx); } | |
632 | ||
a2fb1b05 | 633 | // Return the appropriate Sized_target structure. |
14bfc3f5 ILT |
634 | Sized_target<size, big_endian>* |
635 | sized_target() | |
274e99f9 | 636 | { |
593f47df ILT |
637 | return this->Object::sized_target |
638 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
639 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
274e99f9 | 640 | } |
bae7f79e | 641 | |
b8e6aad9 ILT |
642 | // Return the value of a local symbol define in input section SHNDX, |
643 | // with value VALUE, adding addend ADDEND. This handles SHF_MERGE | |
644 | // sections. | |
645 | Address | |
646 | local_value(unsigned int shndx, Address value, Address addend) const; | |
647 | ||
bae7f79e | 648 | private: |
a2fb1b05 | 649 | // For convenience. |
f6ce93d6 | 650 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
651 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
652 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
653 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
654 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
655 | ||
dbe717ef ILT |
656 | // Find the SHT_SYMTAB section, given the section headers. |
657 | void | |
658 | find_symtab(const unsigned char* pshdrs); | |
659 | ||
a2fb1b05 ILT |
660 | // Whether to include a section group in the link. |
661 | bool | |
662 | include_section_group(Layout*, unsigned int, | |
663 | const elfcpp::Shdr<size, big_endian>&, | |
664 | std::vector<bool>*); | |
665 | ||
666 | // Whether to include a linkonce section in the link. | |
667 | bool | |
668 | include_linkonce_section(Layout*, const char*, | |
669 | const elfcpp::Shdr<size, big_endian>&); | |
670 | ||
61ba1cf9 ILT |
671 | // Views and sizes when relocating. |
672 | struct View_size | |
673 | { | |
674 | unsigned char* view; | |
675 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
676 | off_t offset; | |
677 | off_t view_size; | |
678 | }; | |
679 | ||
680 | typedef std::vector<View_size> Views; | |
681 | ||
682 | // Write section data to the output file. Record the views and | |
683 | // sizes in VIEWS for use when relocating. | |
684 | void | |
685 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); | |
686 | ||
687 | // Relocate the sections in the output file. | |
688 | void | |
92e059d8 ILT |
689 | relocate_sections(const General_options& options, const Symbol_table*, |
690 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 ILT |
691 | |
692 | // Write out the local symbols. | |
693 | void | |
b8e6aad9 ILT |
694 | write_local_symbols(Output_file*, |
695 | const Stringpool_template<char>*); | |
61ba1cf9 | 696 | |
645f8123 ILT |
697 | // General access to the ELF file. |
698 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 699 | // Index of SHT_SYMTAB section. |
645f8123 | 700 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
701 | // The number of local symbols. |
702 | unsigned int local_symbol_count_; | |
703 | // The number of local symbols which go into the output file. | |
704 | unsigned int output_local_symbol_count_; | |
14bfc3f5 ILT |
705 | // The entries in the symbol table for the external symbols. |
706 | Symbol** symbols_; | |
75f65a3e ILT |
707 | // File offset for local symbols. |
708 | off_t local_symbol_offset_; | |
61ba1cf9 | 709 | // Values of local symbols. |
c06b7b0b | 710 | Local_values local_values_; |
bae7f79e ILT |
711 | }; |
712 | ||
54dc6425 | 713 | // A class to manage the list of all objects. |
a2fb1b05 | 714 | |
54dc6425 ILT |
715 | class Input_objects |
716 | { | |
717 | public: | |
718 | Input_objects() | |
008db82e | 719 | : relobj_list_(), dynobj_list_(), target_(NULL), sonames_() |
54dc6425 ILT |
720 | { } |
721 | ||
f6ce93d6 ILT |
722 | // The type of the list of input relocateable objects. |
723 | typedef std::vector<Relobj*> Relobj_list; | |
724 | typedef Relobj_list::const_iterator Relobj_iterator; | |
725 | ||
726 | // The type of the list of input dynamic objects. | |
727 | typedef std::vector<Dynobj*> Dynobj_list; | |
728 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 729 | |
008db82e ILT |
730 | // Add an object to the list. Return true if all is well, or false |
731 | // if this object should be ignored. | |
732 | bool | |
54dc6425 ILT |
733 | add_object(Object*); |
734 | ||
75f65a3e ILT |
735 | // Get the target we should use for the output file. |
736 | Target* | |
737 | target() const | |
738 | { return this->target_; } | |
739 | ||
f6ce93d6 ILT |
740 | // Iterate over all regular objects. |
741 | ||
742 | Relobj_iterator | |
743 | relobj_begin() const | |
744 | { return this->relobj_list_.begin(); } | |
745 | ||
746 | Relobj_iterator | |
747 | relobj_end() const | |
748 | { return this->relobj_list_.end(); } | |
749 | ||
750 | // Iterate over all dynamic objects. | |
751 | ||
752 | Dynobj_iterator | |
753 | dynobj_begin() const | |
754 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 755 | |
f6ce93d6 ILT |
756 | Dynobj_iterator |
757 | dynobj_end() const | |
758 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
759 | |
760 | // Return whether we have seen any dynamic objects. | |
761 | bool | |
762 | any_dynamic() const | |
f6ce93d6 | 763 | { return !this->dynobj_list_.empty(); } |
54dc6425 ILT |
764 | |
765 | private: | |
766 | Input_objects(const Input_objects&); | |
767 | Input_objects& operator=(const Input_objects&); | |
768 | ||
008db82e | 769 | // The list of ordinary objects included in the link. |
f6ce93d6 | 770 | Relobj_list relobj_list_; |
008db82e | 771 | // The list of dynamic objects included in the link. |
f6ce93d6 | 772 | Dynobj_list dynobj_list_; |
008db82e | 773 | // The target. |
75f65a3e | 774 | Target* target_; |
008db82e ILT |
775 | // SONAMEs that we have seen. |
776 | Unordered_set<std::string> sonames_; | |
54dc6425 | 777 | }; |
a2fb1b05 | 778 | |
92e059d8 ILT |
779 | // Some of the information we pass to the relocation routines. We |
780 | // group this together to avoid passing a dozen different arguments. | |
781 | ||
782 | template<int size, bool big_endian> | |
783 | struct Relocate_info | |
784 | { | |
785 | // Command line options. | |
786 | const General_options* options; | |
787 | // Symbol table. | |
788 | const Symbol_table* symtab; | |
789 | // Layout. | |
790 | const Layout* layout; | |
791 | // Object being relocated. | |
f6ce93d6 | 792 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
793 | // Number of local symbols. |
794 | unsigned int local_symbol_count; | |
795 | // Values of local symbols. | |
c06b7b0b | 796 | const typename Sized_relobj<size, big_endian>::Local_values* local_values; |
92e059d8 | 797 | // Global symbols. |
c06b7b0b | 798 | const Symbol* const * symbols; |
92e059d8 ILT |
799 | // Section index of relocation section. |
800 | unsigned int reloc_shndx; | |
801 | // Section index of section being relocated. | |
802 | unsigned int data_shndx; | |
803 | ||
804 | // Return a string showing the location of a relocation. This is | |
805 | // only used for error messages. | |
806 | std::string | |
807 | location(size_t relnum, off_t reloffset) const; | |
808 | }; | |
809 | ||
bae7f79e ILT |
810 | // Return an Object appropriate for the input file. P is BYTES long, |
811 | // and holds the ELF header. | |
812 | ||
61ba1cf9 ILT |
813 | extern Object* |
814 | make_elf_object(const std::string& name, Input_file*, | |
815 | off_t offset, const unsigned char* p, | |
816 | off_t bytes); | |
bae7f79e ILT |
817 | |
818 | } // end namespace gold | |
819 | ||
820 | #endif // !defined(GOLD_OBJECT_H) |