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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 | |
7e1edb90 ILT |
174 | layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd) |
175 | { this->do_layout(symtab, layout, sd); } | |
5a6f7e2d ILT |
176 | |
177 | // Add symbol information to the global symbol table. | |
178 | void | |
179 | add_symbols(Symbol_table* symtab, Read_symbols_data* sd) | |
180 | { this->do_add_symbols(symtab, sd); } | |
181 | ||
645f8123 ILT |
182 | // Functions and types for the elfcpp::Elf_file interface. This |
183 | // permit us to use Object as the File template parameter for | |
184 | // elfcpp::Elf_file. | |
185 | ||
186 | // The View class is returned by view. It must support a single | |
187 | // method, data(). This is trivial, because get_view does what we | |
188 | // need. | |
189 | class View | |
190 | { | |
191 | public: | |
192 | View(const unsigned char* p) | |
193 | : p_(p) | |
194 | { } | |
195 | ||
196 | const unsigned char* | |
197 | data() const | |
198 | { return this->p_; } | |
199 | ||
200 | private: | |
201 | const unsigned char* p_; | |
202 | }; | |
203 | ||
204 | // Return a View. | |
205 | View | |
206 | view(off_t file_offset, off_t data_size) | |
207 | { return View(this->get_view(file_offset, data_size)); } | |
208 | ||
209 | // Report an error. | |
210 | void | |
211 | error(const char* format, ...) ATTRIBUTE_PRINTF_2; | |
212 | ||
213 | // A location in the file. | |
214 | struct Location | |
215 | { | |
216 | off_t file_offset; | |
217 | off_t data_size; | |
218 | ||
219 | Location(off_t fo, off_t ds) | |
220 | : file_offset(fo), data_size(ds) | |
221 | { } | |
222 | }; | |
223 | ||
224 | // Get a View given a Location. | |
225 | View view(Location loc) | |
226 | { return View(this->get_view(loc.file_offset, loc.data_size)); } | |
227 | ||
f6ce93d6 ILT |
228 | protected: |
229 | // Read the symbols--implemented by child class. | |
230 | virtual void | |
231 | do_read_symbols(Read_symbols_data*) = 0; | |
232 | ||
233 | // Lay out sections--implemented by child class. | |
234 | virtual void | |
7e1edb90 | 235 | do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0; |
f6ce93d6 ILT |
236 | |
237 | // Add symbol information to the global symbol table--implemented by | |
238 | // child class. | |
239 | virtual void | |
240 | do_add_symbols(Symbol_table*, Read_symbols_data*) = 0; | |
241 | ||
645f8123 ILT |
242 | // Return the location of the contents of a section. Implemented by |
243 | // child class. | |
244 | virtual Location | |
a3ad94ed | 245 | do_section_contents(unsigned int shndx) = 0; |
f6ce93d6 ILT |
246 | |
247 | // Get the name of a section--implemented by child class. | |
248 | virtual std::string | |
a3ad94ed ILT |
249 | do_section_name(unsigned int shndx) = 0; |
250 | ||
251 | // Get section flags--implemented by child class. | |
252 | virtual uint64_t | |
253 | do_section_flags(unsigned int shndx) = 0; | |
f6ce93d6 ILT |
254 | |
255 | // Get the file. | |
256 | Input_file* | |
257 | input_file() const | |
258 | { return this->input_file_; } | |
259 | ||
260 | // Get the offset into the file. | |
261 | off_t | |
262 | offset() const | |
263 | { return this->offset_; } | |
264 | ||
265 | // Get a view into the underlying file. | |
266 | const unsigned char* | |
267 | get_view(off_t start, off_t size) | |
268 | { return this->input_file_->file().get_view(start + this->offset_, size); } | |
269 | ||
270 | // Get a lasting view into the underlying file. | |
271 | File_view* | |
272 | get_lasting_view(off_t start, off_t size) | |
273 | { | |
274 | return this->input_file_->file().get_lasting_view(start + this->offset_, | |
275 | size); | |
276 | } | |
277 | ||
278 | // Read data from the underlying file. | |
279 | void | |
280 | read(off_t start, off_t size, void* p) | |
281 | { this->input_file_->file().read(start + this->offset_, size, p); } | |
282 | ||
283 | // Set the target. | |
284 | void | |
dbe717ef ILT |
285 | set_target(int machine, int size, bool big_endian, int osabi, |
286 | int abiversion); | |
287 | ||
dbe717ef ILT |
288 | // Set the number of sections. |
289 | void | |
290 | set_shnum(int shnum) | |
291 | { this->shnum_ = shnum; } | |
292 | ||
293 | // Functions used by both Sized_relobj and Sized_dynobj. | |
294 | ||
295 | // Read the section data into a Read_symbols_data object. | |
296 | template<int size, bool big_endian> | |
297 | void | |
298 | read_section_data(elfcpp::Elf_file<size, big_endian, Object>*, | |
299 | Read_symbols_data*); | |
300 | ||
301 | // If NAME is the name of a special .gnu.warning section, arrange | |
302 | // for the warning to be issued. SHNDX is the section index. | |
303 | // Return whether it is a warning section. | |
304 | bool | |
305 | handle_gnu_warning_section(const char* name, unsigned int shndx, | |
306 | Symbol_table*); | |
f6ce93d6 ILT |
307 | |
308 | private: | |
309 | // This class may not be copied. | |
310 | Object(const Object&); | |
311 | Object& operator=(const Object&); | |
312 | ||
313 | // Name of object as printed to user. | |
314 | std::string name_; | |
315 | // For reading the file. | |
316 | Input_file* input_file_; | |
317 | // Offset within the file--0 for an object file, non-0 for an | |
318 | // archive. | |
319 | off_t offset_; | |
dbe717ef ILT |
320 | // Number of input sections. |
321 | unsigned int shnum_; | |
f6ce93d6 ILT |
322 | // Whether this is a dynamic object. |
323 | bool is_dynamic_; | |
324 | // Target functions--may be NULL if the target is not known. | |
325 | Target* target_; | |
326 | }; | |
327 | ||
328 | // Implement sized_target inline for efficiency. This approach breaks | |
329 | // static type checking, but is made safe using asserts. | |
330 | ||
331 | template<int size, bool big_endian> | |
332 | inline Sized_target<size, big_endian>* | |
333 | Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY) | |
334 | { | |
a3ad94ed ILT |
335 | gold_assert(this->target_->get_size() == size); |
336 | gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian); | |
f6ce93d6 ILT |
337 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
338 | } | |
339 | ||
340 | // A regular object (ET_REL). This is an abstract base class itself. | |
b8e6aad9 | 341 | // The implementation is the template class Sized_relobj. |
f6ce93d6 ILT |
342 | |
343 | class Relobj : public Object | |
344 | { | |
345 | public: | |
346 | Relobj(const std::string& name, Input_file* input_file, off_t offset = 0) | |
347 | : Object(name, input_file, false, offset) | |
348 | { } | |
349 | ||
92e059d8 | 350 | // Read the relocs. |
a2fb1b05 | 351 | void |
92e059d8 ILT |
352 | read_relocs(Read_relocs_data* rd) |
353 | { return this->do_read_relocs(rd); } | |
354 | ||
355 | // Scan the relocs and adjust the symbol table. | |
356 | void | |
357 | scan_relocs(const General_options& options, Symbol_table* symtab, | |
ead1e424 ILT |
358 | Layout* layout, Read_relocs_data* rd) |
359 | { return this->do_scan_relocs(options, symtab, layout, rd); } | |
a2fb1b05 | 360 | |
75f65a3e ILT |
361 | // Initial local symbol processing: set the offset where local |
362 | // symbol information will be stored; add local symbol names to | |
c06b7b0b ILT |
363 | // *POOL; return the new local symbol index. |
364 | unsigned int | |
b8e6aad9 ILT |
365 | finalize_local_symbols(unsigned int index, off_t off, |
366 | Stringpool_template<char>* pool) | |
c06b7b0b | 367 | { return this->do_finalize_local_symbols(index, off, pool); } |
75f65a3e | 368 | |
61ba1cf9 ILT |
369 | // Relocate the input sections and write out the local symbols. |
370 | void | |
371 | relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
372 | const Layout* layout, Output_file* of) |
373 | { return this->do_relocate(options, symtab, layout, of); } | |
61ba1cf9 | 374 | |
a783673b ILT |
375 | // Return whether an input section is being included in the link. |
376 | bool | |
5a6f7e2d | 377 | is_section_included(unsigned int shndx) const |
a783673b | 378 | { |
5a6f7e2d ILT |
379 | gold_assert(shndx < this->map_to_output_.size()); |
380 | return this->map_to_output_[shndx].output_section != NULL; | |
a783673b ILT |
381 | } |
382 | ||
383 | // Given a section index, return the corresponding Output_section | |
384 | // (which will be NULL if the section is not included in the link) | |
385 | // and set *POFF to the offset within that section. | |
386 | inline Output_section* | |
b8e6aad9 | 387 | output_section(unsigned int shndx, off_t* poff) const; |
a783673b | 388 | |
ead1e424 ILT |
389 | // Set the offset of an input section within its output section. |
390 | void | |
391 | set_section_offset(unsigned int shndx, off_t off) | |
392 | { | |
a3ad94ed | 393 | gold_assert(shndx < this->map_to_output_.size()); |
ead1e424 ILT |
394 | this->map_to_output_[shndx].offset = off; |
395 | } | |
396 | ||
a783673b | 397 | protected: |
a2fb1b05 ILT |
398 | // What we need to know to map an input section to an output |
399 | // section. We keep an array of these, one for each input section, | |
400 | // indexed by the input section number. | |
401 | struct Map_to_output | |
402 | { | |
403 | // The output section. This is NULL if the input section is to be | |
404 | // discarded. | |
405 | Output_section* output_section; | |
b8e6aad9 ILT |
406 | // The offset within the output section. This is -1 if the |
407 | // section requires special handling. | |
a2fb1b05 ILT |
408 | off_t offset; |
409 | }; | |
410 | ||
92e059d8 ILT |
411 | // Read the relocs--implemented by child class. |
412 | virtual void | |
413 | do_read_relocs(Read_relocs_data*) = 0; | |
414 | ||
415 | // Scan the relocs--implemented by child class. | |
416 | virtual void | |
ead1e424 ILT |
417 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
418 | Read_relocs_data*) = 0; | |
92e059d8 | 419 | |
75f65a3e | 420 | // Finalize local symbols--implemented by child class. |
c06b7b0b | 421 | virtual unsigned int |
b8e6aad9 ILT |
422 | do_finalize_local_symbols(unsigned int, off_t, |
423 | Stringpool_template<char>*) = 0; | |
75f65a3e | 424 | |
61ba1cf9 ILT |
425 | // Relocate the input sections and write out the local |
426 | // symbols--implemented by child class. | |
427 | virtual void | |
428 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
429 | const Layout*, Output_file* of) = 0; |
430 | ||
a2fb1b05 ILT |
431 | // Return the vector mapping input sections to output sections. |
432 | std::vector<Map_to_output>& | |
433 | map_to_output() | |
434 | { return this->map_to_output_; } | |
435 | ||
b8e6aad9 ILT |
436 | const std::vector<Map_to_output>& |
437 | map_to_output() const | |
438 | { return this->map_to_output_; } | |
439 | ||
bae7f79e | 440 | private: |
a2fb1b05 ILT |
441 | // Mapping from input sections to output section. |
442 | std::vector<Map_to_output> map_to_output_; | |
bae7f79e ILT |
443 | }; |
444 | ||
a783673b ILT |
445 | // Implement Object::output_section inline for efficiency. |
446 | inline Output_section* | |
b8e6aad9 | 447 | Relobj::output_section(unsigned int shndx, off_t* poff) const |
a783673b | 448 | { |
5a6f7e2d ILT |
449 | gold_assert(shndx < this->map_to_output_.size()); |
450 | const Map_to_output& mo(this->map_to_output_[shndx]); | |
a783673b ILT |
451 | *poff = mo.offset; |
452 | return mo.output_section; | |
453 | } | |
454 | ||
b8e6aad9 ILT |
455 | // This POD class is holds the value of a symbol. This is used for |
456 | // local symbols, and for all symbols during relocation processing. | |
457 | // In order to process relocs we need to be able to handle SHF_MERGE | |
458 | // sections correctly. | |
459 | ||
460 | template<int size> | |
461 | class Symbol_value | |
462 | { | |
463 | public: | |
464 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Value; | |
465 | ||
466 | Symbol_value() | |
467 | : output_symtab_index_(0), input_shndx_(0), needs_output_address_(false), | |
468 | value_(0) | |
469 | { } | |
470 | ||
471 | // Get the value of this symbol. OBJECT is the object in which this | |
472 | // symbol is defined, and ADDEND is an addend to add to the value. | |
473 | template<bool big_endian> | |
474 | Value | |
475 | value(const Sized_relobj<size, big_endian>* object, Value addend) const | |
476 | { | |
477 | if (!this->needs_output_address_) | |
478 | return this->value_ + addend; | |
479 | return object->local_value(this->input_shndx_, this->value_, addend); | |
480 | } | |
481 | ||
482 | // Set the value of this symbol in the output symbol table. | |
483 | void | |
484 | set_output_value(Value value) | |
485 | { | |
486 | this->value_ = value; | |
487 | this->needs_output_address_ = false; | |
488 | } | |
489 | ||
490 | // If this symbol is mapped to an output section which requires | |
491 | // special handling to determine the output value, we store the | |
492 | // value of the symbol in the input file. This is used for | |
493 | // SHF_MERGE sections. | |
494 | void | |
495 | set_input_value(Value value) | |
496 | { | |
497 | this->value_ = value; | |
498 | this->needs_output_address_ = true; | |
499 | } | |
500 | ||
501 | // Return whether this symbol should go into the output symbol | |
502 | // table. | |
503 | bool | |
504 | needs_output_symtab_entry() const | |
505 | { | |
506 | gold_assert(this->output_symtab_index_ != 0); | |
507 | return this->output_symtab_index_ != -1U; | |
508 | } | |
509 | ||
510 | // Return the index in the output symbol table. | |
511 | unsigned int | |
512 | output_symtab_index() const | |
513 | { | |
514 | gold_assert(this->output_symtab_index_ != 0); | |
515 | return this->output_symtab_index_; | |
516 | } | |
517 | ||
518 | // Set the index in the output symbol table. | |
519 | void | |
520 | set_output_symtab_index(unsigned int i) | |
521 | { | |
522 | gold_assert(this->output_symtab_index_ == 0); | |
523 | this->output_symtab_index_ = i; | |
524 | } | |
525 | ||
526 | // Record that this symbol should not go into the output symbol | |
527 | // table. | |
528 | void | |
529 | set_no_output_symtab_entry() | |
530 | { | |
531 | gold_assert(this->output_symtab_index_ == 0); | |
532 | this->output_symtab_index_ = -1U; | |
533 | } | |
534 | ||
535 | // Set the index of the input section in the input file. | |
536 | void | |
537 | set_input_shndx(unsigned int i) | |
538 | { this->input_shndx_ = i; } | |
539 | ||
540 | private: | |
541 | // The index of this local symbol in the output symbol table. This | |
542 | // will be -1 if the symbol should not go into the symbol table. | |
543 | unsigned int output_symtab_index_; | |
544 | // The section index in the input file in which this symbol is | |
545 | // defined. | |
546 | unsigned int input_shndx_ : 31; | |
547 | // Whether getting the value of this symbol requires calling an | |
548 | // Output_section method. For example, this will be true of a | |
549 | // STT_SECTION symbol in a SHF_MERGE section. | |
550 | bool needs_output_address_ : 1; | |
551 | // The value of the symbol. If !needs_output_address_, this is the | |
552 | // value in the output file. If needs_output_address_, this is the | |
553 | // value in the input file. | |
554 | Value value_; | |
555 | }; | |
556 | ||
14bfc3f5 | 557 | // A regular object file. This is size and endian specific. |
bae7f79e ILT |
558 | |
559 | template<int size, bool big_endian> | |
f6ce93d6 | 560 | class Sized_relobj : public Relobj |
bae7f79e ILT |
561 | { |
562 | public: | |
c06b7b0b | 563 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
b8e6aad9 | 564 | typedef std::vector<Symbol_value<size> > Local_values; |
c06b7b0b | 565 | |
f6ce93d6 | 566 | Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, |
bae7f79e ILT |
567 | const typename elfcpp::Ehdr<size, big_endian>&); |
568 | ||
f6ce93d6 | 569 | ~Sized_relobj(); |
bae7f79e | 570 | |
a2fb1b05 | 571 | // Set up the object file based on the ELF header. |
bae7f79e ILT |
572 | void |
573 | setup(const typename elfcpp::Ehdr<size, big_endian>&); | |
574 | ||
c06b7b0b ILT |
575 | // Return the index of local symbol SYM in the ordinary symbol |
576 | // table. A value of -1U means that the symbol is not being output. | |
577 | unsigned int | |
578 | symtab_index(unsigned int sym) const | |
579 | { | |
b8e6aad9 ILT |
580 | gold_assert(sym < this->local_values_.size()); |
581 | return this->local_values_[sym].output_symtab_index(); | |
c06b7b0b ILT |
582 | } |
583 | ||
a2fb1b05 | 584 | // Read the symbols. |
bae7f79e | 585 | void |
12e14209 | 586 | do_read_symbols(Read_symbols_data*); |
14bfc3f5 | 587 | |
dbe717ef ILT |
588 | // Lay out the input sections. |
589 | void | |
7e1edb90 | 590 | do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
dbe717ef | 591 | |
12e14209 ILT |
592 | // Add the symbols to the symbol table. |
593 | void | |
594 | do_add_symbols(Symbol_table*, Read_symbols_data*); | |
a2fb1b05 | 595 | |
92e059d8 ILT |
596 | // Read the relocs. |
597 | void | |
598 | do_read_relocs(Read_relocs_data*); | |
599 | ||
600 | // Scan the relocs and adjust the symbol table. | |
601 | void | |
ead1e424 ILT |
602 | do_scan_relocs(const General_options&, Symbol_table*, Layout*, |
603 | Read_relocs_data*); | |
92e059d8 | 604 | |
75f65a3e | 605 | // Finalize the local symbols. |
c06b7b0b | 606 | unsigned int |
b8e6aad9 ILT |
607 | do_finalize_local_symbols(unsigned int, off_t, |
608 | Stringpool_template<char>*); | |
75f65a3e | 609 | |
61ba1cf9 ILT |
610 | // Relocate the input sections and write out the local symbols. |
611 | void | |
612 | do_relocate(const General_options& options, const Symbol_table* symtab, | |
92e059d8 ILT |
613 | const Layout*, Output_file* of); |
614 | ||
615 | // Get the name of a section. | |
616 | std::string | |
645f8123 ILT |
617 | do_section_name(unsigned int shndx) |
618 | { return this->elf_file_.section_name(shndx); } | |
61ba1cf9 | 619 | |
645f8123 | 620 | // Return the location of the contents of a section. |
dbe717ef | 621 | Object::Location |
645f8123 ILT |
622 | do_section_contents(unsigned int shndx) |
623 | { return this->elf_file_.section_contents(shndx); } | |
f6ce93d6 | 624 | |
a3ad94ed ILT |
625 | // Return section flags. |
626 | uint64_t | |
627 | do_section_flags(unsigned int shndx) | |
628 | { return this->elf_file_.section_flags(shndx); } | |
629 | ||
a2fb1b05 | 630 | // Return the appropriate Sized_target structure. |
14bfc3f5 ILT |
631 | Sized_target<size, big_endian>* |
632 | sized_target() | |
274e99f9 | 633 | { |
593f47df ILT |
634 | return this->Object::sized_target |
635 | SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( | |
636 | SELECT_SIZE_ENDIAN_ONLY(size, big_endian)); | |
274e99f9 | 637 | } |
bae7f79e | 638 | |
b8e6aad9 ILT |
639 | // Return the value of a local symbol define in input section SHNDX, |
640 | // with value VALUE, adding addend ADDEND. This handles SHF_MERGE | |
641 | // sections. | |
642 | Address | |
643 | local_value(unsigned int shndx, Address value, Address addend) const; | |
644 | ||
bae7f79e | 645 | private: |
a2fb1b05 | 646 | // For convenience. |
f6ce93d6 | 647 | typedef Sized_relobj<size, big_endian> This; |
a2fb1b05 ILT |
648 | static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
649 | static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
650 | static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
75f65a3e ILT |
651 | typedef elfcpp::Shdr<size, big_endian> Shdr; |
652 | ||
dbe717ef ILT |
653 | // Find the SHT_SYMTAB section, given the section headers. |
654 | void | |
655 | find_symtab(const unsigned char* pshdrs); | |
656 | ||
a2fb1b05 ILT |
657 | // Whether to include a section group in the link. |
658 | bool | |
659 | include_section_group(Layout*, unsigned int, | |
660 | const elfcpp::Shdr<size, big_endian>&, | |
661 | std::vector<bool>*); | |
662 | ||
663 | // Whether to include a linkonce section in the link. | |
664 | bool | |
665 | include_linkonce_section(Layout*, const char*, | |
666 | const elfcpp::Shdr<size, big_endian>&); | |
667 | ||
61ba1cf9 ILT |
668 | // Views and sizes when relocating. |
669 | struct View_size | |
670 | { | |
671 | unsigned char* view; | |
672 | typename elfcpp::Elf_types<size>::Elf_Addr address; | |
673 | off_t offset; | |
674 | off_t view_size; | |
675 | }; | |
676 | ||
677 | typedef std::vector<View_size> Views; | |
678 | ||
679 | // Write section data to the output file. Record the views and | |
680 | // sizes in VIEWS for use when relocating. | |
681 | void | |
682 | write_sections(const unsigned char* pshdrs, Output_file*, Views*); | |
683 | ||
684 | // Relocate the sections in the output file. | |
685 | void | |
92e059d8 ILT |
686 | relocate_sections(const General_options& options, const Symbol_table*, |
687 | const Layout*, const unsigned char* pshdrs, Views*); | |
61ba1cf9 ILT |
688 | |
689 | // Write out the local symbols. | |
690 | void | |
b8e6aad9 ILT |
691 | write_local_symbols(Output_file*, |
692 | const Stringpool_template<char>*); | |
61ba1cf9 | 693 | |
645f8123 ILT |
694 | // General access to the ELF file. |
695 | elfcpp::Elf_file<size, big_endian, Object> elf_file_; | |
bae7f79e | 696 | // Index of SHT_SYMTAB section. |
645f8123 | 697 | unsigned int symtab_shndx_; |
61ba1cf9 ILT |
698 | // The number of local symbols. |
699 | unsigned int local_symbol_count_; | |
700 | // The number of local symbols which go into the output file. | |
701 | unsigned int output_local_symbol_count_; | |
14bfc3f5 ILT |
702 | // The entries in the symbol table for the external symbols. |
703 | Symbol** symbols_; | |
75f65a3e ILT |
704 | // File offset for local symbols. |
705 | off_t local_symbol_offset_; | |
61ba1cf9 | 706 | // Values of local symbols. |
c06b7b0b | 707 | Local_values local_values_; |
bae7f79e ILT |
708 | }; |
709 | ||
54dc6425 | 710 | // A class to manage the list of all objects. |
a2fb1b05 | 711 | |
54dc6425 ILT |
712 | class Input_objects |
713 | { | |
714 | public: | |
715 | Input_objects() | |
008db82e | 716 | : relobj_list_(), dynobj_list_(), target_(NULL), sonames_() |
54dc6425 ILT |
717 | { } |
718 | ||
f6ce93d6 ILT |
719 | // The type of the list of input relocateable objects. |
720 | typedef std::vector<Relobj*> Relobj_list; | |
721 | typedef Relobj_list::const_iterator Relobj_iterator; | |
722 | ||
723 | // The type of the list of input dynamic objects. | |
724 | typedef std::vector<Dynobj*> Dynobj_list; | |
725 | typedef Dynobj_list::const_iterator Dynobj_iterator; | |
54dc6425 | 726 | |
008db82e ILT |
727 | // Add an object to the list. Return true if all is well, or false |
728 | // if this object should be ignored. | |
729 | bool | |
54dc6425 ILT |
730 | add_object(Object*); |
731 | ||
75f65a3e ILT |
732 | // Get the target we should use for the output file. |
733 | Target* | |
734 | target() const | |
735 | { return this->target_; } | |
736 | ||
f6ce93d6 ILT |
737 | // Iterate over all regular objects. |
738 | ||
739 | Relobj_iterator | |
740 | relobj_begin() const | |
741 | { return this->relobj_list_.begin(); } | |
742 | ||
743 | Relobj_iterator | |
744 | relobj_end() const | |
745 | { return this->relobj_list_.end(); } | |
746 | ||
747 | // Iterate over all dynamic objects. | |
748 | ||
749 | Dynobj_iterator | |
750 | dynobj_begin() const | |
751 | { return this->dynobj_list_.begin(); } | |
54dc6425 | 752 | |
f6ce93d6 ILT |
753 | Dynobj_iterator |
754 | dynobj_end() const | |
755 | { return this->dynobj_list_.end(); } | |
54dc6425 ILT |
756 | |
757 | // Return whether we have seen any dynamic objects. | |
758 | bool | |
759 | any_dynamic() const | |
f6ce93d6 | 760 | { return !this->dynobj_list_.empty(); } |
54dc6425 ILT |
761 | |
762 | private: | |
763 | Input_objects(const Input_objects&); | |
764 | Input_objects& operator=(const Input_objects&); | |
765 | ||
008db82e | 766 | // The list of ordinary objects included in the link. |
f6ce93d6 | 767 | Relobj_list relobj_list_; |
008db82e | 768 | // The list of dynamic objects included in the link. |
f6ce93d6 | 769 | Dynobj_list dynobj_list_; |
008db82e | 770 | // The target. |
75f65a3e | 771 | Target* target_; |
008db82e ILT |
772 | // SONAMEs that we have seen. |
773 | Unordered_set<std::string> sonames_; | |
54dc6425 | 774 | }; |
a2fb1b05 | 775 | |
92e059d8 ILT |
776 | // Some of the information we pass to the relocation routines. We |
777 | // group this together to avoid passing a dozen different arguments. | |
778 | ||
779 | template<int size, bool big_endian> | |
780 | struct Relocate_info | |
781 | { | |
782 | // Command line options. | |
783 | const General_options* options; | |
784 | // Symbol table. | |
785 | const Symbol_table* symtab; | |
786 | // Layout. | |
787 | const Layout* layout; | |
788 | // Object being relocated. | |
f6ce93d6 | 789 | Sized_relobj<size, big_endian>* object; |
92e059d8 ILT |
790 | // Number of local symbols. |
791 | unsigned int local_symbol_count; | |
792 | // Values of local symbols. | |
c06b7b0b | 793 | const typename Sized_relobj<size, big_endian>::Local_values* local_values; |
92e059d8 | 794 | // Global symbols. |
c06b7b0b | 795 | const Symbol* const * symbols; |
92e059d8 ILT |
796 | // Section index of relocation section. |
797 | unsigned int reloc_shndx; | |
798 | // Section index of section being relocated. | |
799 | unsigned int data_shndx; | |
800 | ||
801 | // Return a string showing the location of a relocation. This is | |
802 | // only used for error messages. | |
803 | std::string | |
804 | location(size_t relnum, off_t reloffset) const; | |
805 | }; | |
806 | ||
bae7f79e ILT |
807 | // Return an Object appropriate for the input file. P is BYTES long, |
808 | // and holds the ELF header. | |
809 | ||
61ba1cf9 ILT |
810 | extern Object* |
811 | make_elf_object(const std::string& name, Input_file*, | |
812 | off_t offset, const unsigned char* p, | |
813 | off_t bytes); | |
bae7f79e ILT |
814 | |
815 | } // end namespace gold | |
816 | ||
817 | #endif // !defined(GOLD_OBJECT_H) |