Commit | Line | Data |
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cd4fb1b2 SM |
1 | /* DWARF 2 debugging format support for GDB. |
2 | ||
b811d2c2 | 3 | Copyright (C) 1994-2020 Free Software Foundation, Inc. |
cd4fb1b2 SM |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef DWARF2READ_H | |
21 | #define DWARF2READ_H | |
22 | ||
39856def | 23 | #include <queue> |
e4a62c65 | 24 | #include <unordered_map> |
82ca8957 | 25 | #include "dwarf2/index-cache.h" |
2c86cff9 | 26 | #include "dwarf2/section.h" |
cd4fb1b2 SM |
27 | #include "filename-seen-cache.h" |
28 | #include "gdb_obstack.h" | |
268a13a5 | 29 | #include "gdbsupport/hash_enum.h" |
891813be | 30 | #include "psympriv.h" |
cd4fb1b2 | 31 | |
3c3bb058 AB |
32 | /* Hold 'maintenance (set|show) dwarf' commands. */ |
33 | extern struct cmd_list_element *set_dwarf_cmdlist; | |
34 | extern struct cmd_list_element *show_dwarf_cmdlist; | |
35 | ||
cd4fb1b2 SM |
36 | struct tu_stats |
37 | { | |
38 | int nr_uniq_abbrev_tables; | |
39 | int nr_symtabs; | |
40 | int nr_symtab_sharers; | |
41 | int nr_stmt_less_type_units; | |
42 | int nr_all_type_units_reallocs; | |
43 | }; | |
44 | ||
45 | struct dwarf2_debug_sections; | |
39856def | 46 | struct dwarf2_per_cu_data; |
cd4fb1b2 SM |
47 | struct mapped_index; |
48 | struct mapped_debug_names; | |
ff4c9fec | 49 | struct signatured_type; |
8adb8487 | 50 | struct type_unit_group; |
cd4fb1b2 | 51 | |
39856def TT |
52 | /* One item on the queue of compilation units to read in full symbols |
53 | for. */ | |
54 | struct dwarf2_queue_item | |
55 | { | |
120ce1b5 SM |
56 | dwarf2_queue_item (dwarf2_per_cu_data *cu, dwarf2_per_objfile *per_objfile, |
57 | enum language lang) | |
39856def | 58 | : per_cu (cu), |
120ce1b5 | 59 | per_objfile (per_objfile), |
39856def TT |
60 | pretend_language (lang) |
61 | { | |
62 | } | |
63 | ||
64 | ~dwarf2_queue_item (); | |
65 | ||
66 | DISABLE_COPY_AND_ASSIGN (dwarf2_queue_item); | |
67 | ||
120ce1b5 SM |
68 | dwarf2_per_cu_data *per_cu; |
69 | dwarf2_per_objfile *per_objfile; | |
39856def TT |
70 | enum language pretend_language; |
71 | }; | |
72 | ||
5989a64e SM |
73 | /* Some DWARF data can be shared across objfiles who share the same BFD, |
74 | this data is stored in this object. | |
cd4fb1b2 | 75 | |
5989a64e SM |
76 | Two dwarf2_per_objfile objects representing objfiles sharing the same BFD |
77 | will point to the same instance of dwarf2_per_bfd, unless the BFD requires | |
78 | relocation. */ | |
79 | ||
80 | struct dwarf2_per_bfd | |
cd4fb1b2 | 81 | { |
5989a64e | 82 | /* Construct a dwarf2_per_bfd for OBFD. NAMES points to the |
cd4fb1b2 | 83 | dwarf2 section names, or is NULL if the standard ELF names are |
4b610737 TT |
84 | used. CAN_COPY is true for formats where symbol |
85 | interposition is possible and so symbol values must follow copy | |
86 | relocation rules. */ | |
5989a64e | 87 | dwarf2_per_bfd (bfd *obfd, const dwarf2_debug_sections *names, bool can_copy); |
cd4fb1b2 | 88 | |
5989a64e | 89 | ~dwarf2_per_bfd (); |
cd4fb1b2 | 90 | |
5989a64e | 91 | DISABLE_COPY_AND_ASSIGN (dwarf2_per_bfd); |
cd4fb1b2 | 92 | |
ff4c9fec SM |
93 | /* Return the CU/TU given its index. |
94 | ||
95 | This is intended for loops like: | |
96 | ||
5989a64e SM |
97 | for (i = 0; i < (dwarf2_per_bfd->n_comp_units |
98 | + dwarf2_per_bfd->n_type_units); ++i) | |
ff4c9fec | 99 | { |
5989a64e | 100 | dwarf2_per_cu_data *per_cu = dwarf2_per_bfd->get_cutu (i); |
ff4c9fec SM |
101 | |
102 | ...; | |
103 | } | |
104 | */ | |
105 | dwarf2_per_cu_data *get_cutu (int index); | |
106 | ||
107 | /* Return the CU given its index. | |
108 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
109 | CU. */ | |
110 | dwarf2_per_cu_data *get_cu (int index); | |
111 | ||
112 | /* Return the TU given its index. | |
113 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
114 | TU. */ | |
115 | signatured_type *get_tu (int index); | |
116 | ||
cd4fb1b2 SM |
117 | /* Free all cached compilation units. */ |
118 | void free_cached_comp_units (); | |
86c0bb4c | 119 | |
d3473f0c TT |
120 | /* A convenience function to allocate a dwarf2_per_cu_data. The |
121 | returned object has its "index" field set properly. The object | |
5989a64e | 122 | is allocated on the dwarf2_per_bfd obstack. */ |
d3473f0c TT |
123 | dwarf2_per_cu_data *allocate_per_cu (); |
124 | ||
125 | /* A convenience function to allocate a signatured_type. The | |
126 | returned object has its "index" field set properly. The object | |
5989a64e | 127 | is allocated on the dwarf2_per_bfd obstack. */ |
d3473f0c TT |
128 | signatured_type *allocate_signatured_type (); |
129 | ||
af758d11 SM |
130 | /* Return the number of partial symtabs allocated with allocate_per_cu |
131 | and allocate_signatured_type so far. */ | |
132 | int num_psymtabs () const | |
133 | { return m_num_psymtabs; } | |
134 | ||
cd4fb1b2 SM |
135 | private: |
136 | /* This function is mapped across the sections and remembers the | |
137 | offset and size of each of the debugging sections we are | |
138 | interested in. */ | |
139 | void locate_sections (bfd *abfd, asection *sectp, | |
140 | const dwarf2_debug_sections &names); | |
141 | ||
142 | public: | |
c3699833 SM |
143 | /* The corresponding BFD. */ |
144 | bfd *obfd; | |
145 | ||
45940949 TT |
146 | /* Objects that can be shared across objfiles are stored in this |
147 | obstack or on the psymtab obstack, while objects that are | |
148 | objfile-specific are stored on the objfile obstack. */ | |
149 | auto_obstack obstack; | |
150 | ||
cd4fb1b2 SM |
151 | dwarf2_section_info info {}; |
152 | dwarf2_section_info abbrev {}; | |
153 | dwarf2_section_info line {}; | |
154 | dwarf2_section_info loc {}; | |
155 | dwarf2_section_info loclists {}; | |
156 | dwarf2_section_info macinfo {}; | |
157 | dwarf2_section_info macro {}; | |
158 | dwarf2_section_info str {}; | |
18a8505e | 159 | dwarf2_section_info str_offsets {}; |
cd4fb1b2 SM |
160 | dwarf2_section_info line_str {}; |
161 | dwarf2_section_info ranges {}; | |
162 | dwarf2_section_info rnglists {}; | |
163 | dwarf2_section_info addr {}; | |
164 | dwarf2_section_info frame {}; | |
165 | dwarf2_section_info eh_frame {}; | |
166 | dwarf2_section_info gdb_index {}; | |
167 | dwarf2_section_info debug_names {}; | |
168 | dwarf2_section_info debug_aranges {}; | |
169 | ||
fd5866f6 | 170 | std::vector<dwarf2_section_info> types; |
cd4fb1b2 | 171 | |
cd4fb1b2 SM |
172 | /* Table of all the compilation units. This is used to locate |
173 | the target compilation unit of a particular reference. */ | |
b76e467d | 174 | std::vector<dwarf2_per_cu_data *> all_comp_units; |
cd4fb1b2 | 175 | |
b2bdb8cf SM |
176 | /* The .debug_types-related CUs (TUs). */ |
177 | std::vector<signatured_type *> all_type_units; | |
cd4fb1b2 SM |
178 | |
179 | /* Table of struct type_unit_group objects. | |
180 | The hash key is the DW_AT_stmt_list value. */ | |
eaa5fa8b | 181 | htab_up type_unit_groups; |
cd4fb1b2 SM |
182 | |
183 | /* A table mapping .debug_types signatures to its signatured_type entry. | |
184 | This is NULL if the .debug_types section hasn't been read in yet. */ | |
b0b6a987 | 185 | htab_up signatured_types; |
cd4fb1b2 SM |
186 | |
187 | /* Type unit statistics, to see how well the scaling improvements | |
188 | are doing. */ | |
189 | struct tu_stats tu_stats {}; | |
190 | ||
191 | /* A chain of compilation units that are currently read in, so that | |
192 | they can be freed later. */ | |
193 | dwarf2_per_cu_data *read_in_chain = NULL; | |
194 | ||
195 | /* A table mapping DW_AT_dwo_name values to struct dwo_file objects. | |
196 | This is NULL if the table hasn't been allocated yet. */ | |
51ac9db5 | 197 | htab_up dwo_files; |
cd4fb1b2 SM |
198 | |
199 | /* True if we've checked for whether there is a DWP file. */ | |
200 | bool dwp_checked = false; | |
201 | ||
202 | /* The DWP file if there is one, or NULL. */ | |
400174b1 | 203 | std::unique_ptr<struct dwp_file> dwp_file; |
cd4fb1b2 SM |
204 | |
205 | /* The shared '.dwz' file, if one exists. This is used when the | |
206 | original data was compressed using 'dwz -m'. */ | |
7ff8cb8c | 207 | std::unique_ptr<struct dwz_file> dwz_file; |
cd4fb1b2 | 208 | |
4b610737 TT |
209 | /* Whether copy relocations are supported by this object format. */ |
210 | bool can_copy; | |
211 | ||
cd4fb1b2 SM |
212 | /* A flag indicating whether this objfile has a section loaded at a |
213 | VMA of 0. */ | |
214 | bool has_section_at_zero = false; | |
215 | ||
216 | /* True if we are using the mapped index, | |
217 | or we are faking it for OBJF_READNOW's sake. */ | |
218 | bool using_index = false; | |
219 | ||
220 | /* The mapped index, or NULL if .gdb_index is missing or not being used. */ | |
3063847f | 221 | std::unique_ptr<mapped_index> index_table; |
cd4fb1b2 SM |
222 | |
223 | /* The mapped index, or NULL if .debug_names is missing or not being used. */ | |
224 | std::unique_ptr<mapped_debug_names> debug_names_table; | |
225 | ||
226 | /* When using index_table, this keeps track of all quick_file_names entries. | |
227 | TUs typically share line table entries with a CU, so we maintain a | |
228 | separate table of all line table entries to support the sharing. | |
229 | Note that while there can be way more TUs than CUs, we've already | |
230 | sorted all the TUs into "type unit groups", grouped by their | |
231 | DW_AT_stmt_list value. Therefore the only sharing done here is with a | |
232 | CU and its associated TU group if there is one. */ | |
5895093f | 233 | htab_up quick_file_names_table; |
cd4fb1b2 SM |
234 | |
235 | /* Set during partial symbol reading, to prevent queueing of full | |
236 | symbols. */ | |
237 | bool reading_partial_symbols = false; | |
238 | ||
cd4fb1b2 | 239 | /* The CUs we recently read. */ |
c5d0225d | 240 | std::vector<dwarf2_per_cu_data *> just_read_cus; |
cd4fb1b2 SM |
241 | |
242 | /* Table containing line_header indexed by offset and offset_in_dwz. */ | |
d15acc42 | 243 | htab_up line_header_hash; |
cd4fb1b2 SM |
244 | |
245 | /* Table containing all filenames. This is an optional because the | |
246 | table is lazily constructed on first access. */ | |
247 | gdb::optional<filename_seen_cache> filenames_cache; | |
87d6a7aa SM |
248 | |
249 | /* If we loaded the index from an external file, this contains the | |
250 | resources associated to the open file, memory mapping, etc. */ | |
251 | std::unique_ptr<index_cache_resource> index_cache_res; | |
e4a62c65 TV |
252 | |
253 | /* Mapping from abstract origin DIE to concrete DIEs that reference it as | |
254 | DW_AT_abstract_origin. */ | |
fad03f6e TT |
255 | std::unordered_map<sect_offset, std::vector<sect_offset>, |
256 | gdb::hash_enum<sect_offset>> | |
e4a62c65 | 257 | abstract_to_concrete; |
39856def TT |
258 | |
259 | /* CUs that are queued to be read. */ | |
260 | std::queue<dwarf2_queue_item> queue; | |
d3473f0c TT |
261 | |
262 | private: | |
263 | ||
264 | /* The total number of per_cu and signatured_type objects that have | |
265 | been created so far for this reader. */ | |
266 | size_t m_num_psymtabs = 0; | |
cd4fb1b2 SM |
267 | }; |
268 | ||
8adb8487 TT |
269 | /* This is the per-objfile data associated with a type_unit_group. */ |
270 | ||
271 | struct type_unit_group_unshareable | |
272 | { | |
273 | /* The compunit symtab. | |
274 | Type units in a group needn't all be defined in the same source file, | |
275 | so we create an essentially anonymous symtab as the compunit symtab. */ | |
276 | struct compunit_symtab *compunit_symtab = nullptr; | |
277 | ||
278 | /* The number of symtabs from the line header. | |
279 | The value here must match line_header.num_file_names. */ | |
280 | unsigned int num_symtabs = 0; | |
281 | ||
282 | /* The symbol tables for this TU (obtained from the files listed in | |
283 | DW_AT_stmt_list). | |
284 | WARNING: The order of entries here must match the order of entries | |
285 | in the line header. After the first TU using this type_unit_group, the | |
286 | line header for the subsequent TUs is recreated from this. This is done | |
287 | because we need to use the same symtabs for each TU using the same | |
288 | DW_AT_stmt_list value. Also note that symtabs may be repeated here, | |
289 | there's no guarantee the line header doesn't have duplicate entries. */ | |
290 | struct symtab **symtabs = nullptr; | |
291 | }; | |
292 | ||
5989a64e SM |
293 | /* Collection of data recorded per objfile. |
294 | This hangs off of dwarf2_objfile_data_key. | |
295 | ||
296 | Some DWARF data cannot (currently) be shared across objfiles. Such | |
297 | data is stored in this object. */ | |
298 | ||
299 | struct dwarf2_per_objfile | |
300 | { | |
301 | dwarf2_per_objfile (struct objfile *objfile, dwarf2_per_bfd *per_bfd) | |
302 | : objfile (objfile), per_bfd (per_bfd) | |
303 | {} | |
304 | ||
305 | /* Return pointer to string at .debug_line_str offset as read from BUF. | |
306 | BUF is assumed to be in a compilation unit described by CU_HEADER. | |
307 | Return *BYTES_READ_PTR count of bytes read from BUF. */ | |
308 | const char *read_line_string (const gdb_byte *buf, | |
309 | const struct comp_unit_head *cu_header, | |
310 | unsigned int *bytes_read_ptr); | |
311 | ||
af758d11 SM |
312 | /* Resize the M_SYMTABS vector to the needed size (the number of partial |
313 | symtabs allocated by the per-bfd). */ | |
314 | void resize_symtabs () | |
315 | { | |
316 | /* The symtabs vector should only grow, not shrink. */ | |
317 | gdb_assert (per_bfd->num_psymtabs () >= m_symtabs.size ()); | |
318 | ||
319 | m_symtabs.resize (per_bfd->num_psymtabs ()); | |
320 | } | |
321 | ||
322 | /* Return true if the symtab corresponding to PER_CU has been set, | |
323 | false otherwise. */ | |
324 | bool symtab_set_p (const dwarf2_per_cu_data *per_cu) const; | |
325 | ||
326 | /* Return the compunit_symtab associated to PER_CU, if it has been created. */ | |
327 | compunit_symtab *get_symtab (const dwarf2_per_cu_data *per_cu) const; | |
328 | ||
329 | /* Set the compunit_symtab associated to PER_CU. */ | |
330 | void set_symtab (const dwarf2_per_cu_data *per_cu, compunit_symtab *symtab); | |
331 | ||
8adb8487 TT |
332 | /* Get the type_unit_group_unshareable corresponding to TU_GROUP. If one |
333 | does not exist, create it. */ | |
334 | type_unit_group_unshareable *get_type_unit_group_unshareable | |
335 | (type_unit_group *tu_group); | |
336 | ||
293e7e51 SM |
337 | /* Find an integer type SIZE_IN_BYTES bytes in size and return it. |
338 | UNSIGNED_P controls if the integer is unsigned or not. */ | |
339 | struct type *int_type (int size_in_bytes, bool unsigned_p) const; | |
340 | ||
5989a64e SM |
341 | /* Back link. */ |
342 | struct objfile *objfile; | |
343 | ||
344 | /* Pointer to the data that is (possibly) shared between this objfile and | |
345 | other objfiles backed by the same BFD. */ | |
346 | struct dwarf2_per_bfd *per_bfd; | |
af758d11 | 347 | |
ae090bdb SM |
348 | /* Table mapping type DIEs to their struct type *. |
349 | This is nullptr if not allocated yet. | |
350 | The mapping is done via (CU/TU + DIE offset) -> type. */ | |
351 | htab_up die_type_hash; | |
352 | ||
af758d11 SM |
353 | private: |
354 | /* Hold the corresponding compunit_symtab for each CU or TU. This | |
355 | is indexed by dwarf2_per_cu_data::index. A NULL value means | |
356 | that the CU/TU has not been expanded yet. */ | |
357 | std::vector<compunit_symtab *> m_symtabs; | |
8adb8487 TT |
358 | |
359 | /* Map from a type unit group to the corresponding unshared | |
360 | structure. */ | |
361 | typedef std::unique_ptr<type_unit_group_unshareable> | |
362 | type_unit_group_unshareable_up; | |
363 | ||
364 | std::unordered_map<type_unit_group *, type_unit_group_unshareable_up> | |
365 | m_type_units; | |
5989a64e SM |
366 | }; |
367 | ||
cd4fb1b2 SM |
368 | /* Get the dwarf2_per_objfile associated to OBJFILE. */ |
369 | ||
370 | dwarf2_per_objfile *get_dwarf2_per_objfile (struct objfile *objfile); | |
371 | ||
891813be | 372 | /* A partial symtab specialized for DWARF. */ |
af758d11 | 373 | struct dwarf2_psymtab : public partial_symtab |
891813be | 374 | { |
891813be | 375 | dwarf2_psymtab (const char *filename, struct objfile *objfile, |
9f4e76a4 | 376 | dwarf2_per_cu_data *per_cu) |
af758d11 | 377 | : partial_symtab (filename, objfile, 0), |
9f4e76a4 | 378 | per_cu_data (per_cu) |
891813be TT |
379 | { |
380 | } | |
381 | ||
382 | void read_symtab (struct objfile *) override; | |
8566b89b | 383 | void expand_psymtab (struct objfile *) override; |
af758d11 SM |
384 | bool readin_p (struct objfile *) const override; |
385 | compunit_symtab *get_compunit_symtab (struct objfile *) const override; | |
891813be TT |
386 | |
387 | struct dwarf2_per_cu_data *per_cu_data; | |
388 | }; | |
389 | ||
cd4fb1b2 SM |
390 | /* Persistent data held for a compilation unit, even when not |
391 | processing it. We put a pointer to this structure in the | |
891813be | 392 | psymtab. */ |
cd4fb1b2 SM |
393 | |
394 | struct dwarf2_per_cu_data | |
395 | { | |
396 | /* The start offset and length of this compilation unit. | |
397 | NOTE: Unlike comp_unit_head.length, this length includes | |
398 | initial_length_size. | |
399 | If the DIE refers to a DWO file, this is always of the original die, | |
400 | not the DWO file. */ | |
401 | sect_offset sect_off; | |
402 | unsigned int length; | |
403 | ||
404 | /* DWARF standard version this data has been read from (such as 4 or 5). */ | |
405 | short dwarf_version; | |
406 | ||
407 | /* Flag indicating this compilation unit will be read in before | |
408 | any of the current compilation units are processed. */ | |
409 | unsigned int queued : 1; | |
410 | ||
411 | /* This flag will be set when reading partial DIEs if we need to load | |
412 | absolutely all DIEs for this compilation unit, instead of just the ones | |
413 | we think are interesting. It gets set if we look for a DIE in the | |
414 | hash table and don't find it. */ | |
415 | unsigned int load_all_dies : 1; | |
416 | ||
417 | /* Non-zero if this CU is from .debug_types. | |
418 | Struct dwarf2_per_cu_data is contained in struct signatured_type iff | |
419 | this is non-zero. */ | |
420 | unsigned int is_debug_types : 1; | |
421 | ||
422 | /* Non-zero if this CU is from the .dwz file. */ | |
423 | unsigned int is_dwz : 1; | |
424 | ||
425 | /* Non-zero if reading a TU directly from a DWO file, bypassing the stub. | |
426 | This flag is only valid if is_debug_types is true. | |
427 | We can't read a CU directly from a DWO file: There are required | |
428 | attributes in the stub. */ | |
429 | unsigned int reading_dwo_directly : 1; | |
430 | ||
431 | /* Non-zero if the TU has been read. | |
432 | This is used to assist the "Stay in DWO Optimization" for Fission: | |
433 | When reading a DWO, it's faster to read TUs from the DWO instead of | |
434 | fetching them from random other DWOs (due to comdat folding). | |
435 | If the TU has already been read, the optimization is unnecessary | |
436 | (and unwise - we don't want to change where gdb thinks the TU lives | |
437 | "midflight"). | |
438 | This flag is only valid if is_debug_types is true. */ | |
439 | unsigned int tu_read : 1; | |
440 | ||
d3473f0c TT |
441 | /* Our index in the unshared "symtabs" vector. */ |
442 | unsigned index; | |
443 | ||
cd4fb1b2 SM |
444 | /* The section this CU/TU lives in. |
445 | If the DIE refers to a DWO file, this is always the original die, | |
446 | not the DWO file. */ | |
447 | struct dwarf2_section_info *section; | |
448 | ||
449 | /* Set to non-NULL iff this CU is currently loaded. When it gets freed out | |
450 | of the CU cache it gets reset to NULL again. This is left as NULL for | |
451 | dummy CUs (a CU header, but nothing else). */ | |
452 | struct dwarf2_cu *cu; | |
453 | ||
58990295 TV |
454 | /* The unit type of this CU. */ |
455 | enum dwarf_unit_type unit_type; | |
456 | ||
457 | /* The language of this CU. */ | |
458 | enum language lang; | |
459 | ||
1859c670 SM |
460 | /* Backlink to the owner of this. */ |
461 | dwarf2_per_bfd *per_bfd; | |
462 | ||
5989a64e | 463 | /* When dwarf2_per_bfd::using_index is true, the 'quick' field |
cd4fb1b2 SM |
464 | is active. Otherwise, the 'psymtab' field is active. */ |
465 | union | |
466 | { | |
467 | /* The partial symbol table associated with this compilation unit, | |
468 | or NULL for unread partial units. */ | |
891813be | 469 | dwarf2_psymtab *psymtab; |
cd4fb1b2 SM |
470 | |
471 | /* Data needed by the "quick" functions. */ | |
472 | struct dwarf2_per_cu_quick_data *quick; | |
473 | } v; | |
474 | ||
96c738c0 TT |
475 | /* The CUs we import using DW_TAG_imported_unit. This is filled in |
476 | while reading psymtabs, used to compute the psymtab dependencies, | |
477 | and then cleared. Then it is filled in again while reading full | |
478 | symbols, and only deleted when the objfile is destroyed. | |
479 | ||
480 | This is also used to work around a difference between the way gold | |
481 | generates .gdb_index version <=7 and the way gdb does. Arguably this | |
482 | is a gold bug. For symbols coming from TUs, gold records in the index | |
483 | the CU that includes the TU instead of the TU itself. This breaks | |
484 | dw2_lookup_symbol: It assumes that if the index says symbol X lives | |
485 | in CU/TU Y, then one need only expand Y and a subsequent lookup in Y | |
486 | will find X. Alas TUs live in their own symtab, so after expanding CU Y | |
487 | we need to look in TU Z to find X. Fortunately, this is akin to | |
488 | DW_TAG_imported_unit, so we just use the same mechanism: For | |
489 | .gdb_index version <=7 this also records the TUs that the CU referred | |
490 | to. Concurrently with this change gdb was modified to emit version 8 | |
491 | indices so we only pay a price for gold generated indices. | |
492 | http://sourceware.org/bugzilla/show_bug.cgi?id=15021. | |
493 | ||
494 | This currently needs to be a public member due to how | |
495 | dwarf2_per_cu_data is allocated and used. Ideally in future things | |
496 | could be refactored to make this private. Until then please try to | |
497 | avoid direct access to this member, and instead use the helper | |
498 | functions above. */ | |
499 | std::vector <dwarf2_per_cu_data *> *imported_symtabs; | |
500 | ||
ae640021 AB |
501 | /* Return true of IMPORTED_SYMTABS is empty or not yet allocated. */ |
502 | bool imported_symtabs_empty () const | |
503 | { | |
504 | return (imported_symtabs == nullptr || imported_symtabs->empty ()); | |
505 | } | |
506 | ||
507 | /* Push P to the back of IMPORTED_SYMTABS, allocated IMPORTED_SYMTABS | |
508 | first if required. */ | |
509 | void imported_symtabs_push (dwarf2_per_cu_data *p) | |
510 | { | |
511 | if (imported_symtabs == nullptr) | |
512 | imported_symtabs = new std::vector <dwarf2_per_cu_data *>; | |
513 | imported_symtabs->push_back (p); | |
514 | } | |
515 | ||
516 | /* Return the size of IMPORTED_SYMTABS if it is allocated, otherwise | |
517 | return 0. */ | |
518 | size_t imported_symtabs_size () const | |
519 | { | |
520 | if (imported_symtabs == nullptr) | |
521 | return 0; | |
522 | return imported_symtabs->size (); | |
523 | } | |
524 | ||
525 | /* Delete IMPORTED_SYMTABS and set the pointer back to nullptr. */ | |
526 | void imported_symtabs_free () | |
527 | { | |
528 | delete imported_symtabs; | |
529 | imported_symtabs = nullptr; | |
530 | } | |
09ba997f | 531 | |
09ba997f TT |
532 | /* Return the address size given in the compilation unit header for |
533 | this CU. */ | |
534 | int addr_size () const; | |
535 | ||
536 | /* Return the offset size given in the compilation unit header for | |
537 | this CU. */ | |
538 | int offset_size () const; | |
539 | ||
540 | /* Return the DW_FORM_ref_addr size given in the compilation unit | |
541 | header for this CU. */ | |
542 | int ref_addr_size () const; | |
543 | ||
09ba997f TT |
544 | /* Return DWARF version number of this CU. */ |
545 | short version () const | |
546 | { | |
547 | return dwarf_version; | |
548 | } | |
197400e8 TT |
549 | |
550 | /* A type unit group has a per_cu object that is recognized by | |
551 | having no section. */ | |
552 | bool type_unit_group_p () const | |
553 | { | |
554 | return section == nullptr; | |
555 | } | |
cd4fb1b2 SM |
556 | }; |
557 | ||
558 | /* Entry in the signatured_types hash table. */ | |
559 | ||
560 | struct signatured_type | |
561 | { | |
562 | /* The "per_cu" object of this type. | |
563 | This struct is used iff per_cu.is_debug_types. | |
564 | N.B.: This is the first member so that it's easy to convert pointers | |
565 | between them. */ | |
566 | struct dwarf2_per_cu_data per_cu; | |
567 | ||
568 | /* The type's signature. */ | |
569 | ULONGEST signature; | |
570 | ||
571 | /* Offset in the TU of the type's DIE, as read from the TU header. | |
572 | If this TU is a DWO stub and the definition lives in a DWO file | |
573 | (specified by DW_AT_GNU_dwo_name), this value is unusable. */ | |
574 | cu_offset type_offset_in_tu; | |
575 | ||
576 | /* Offset in the section of the type's DIE. | |
577 | If the definition lives in a DWO file, this is the offset in the | |
578 | .debug_types.dwo section. | |
579 | The value is zero until the actual value is known. | |
580 | Zero is otherwise not a valid section offset. */ | |
581 | sect_offset type_offset_in_section; | |
582 | ||
583 | /* Type units are grouped by their DW_AT_stmt_list entry so that they | |
584 | can share them. This points to the containing symtab. */ | |
585 | struct type_unit_group *type_unit_group; | |
586 | ||
587 | /* The type. | |
588 | The first time we encounter this type we fully read it in and install it | |
589 | in the symbol tables. Subsequent times we only need the type. */ | |
590 | struct type *type; | |
591 | ||
592 | /* Containing DWO unit. | |
593 | This field is valid iff per_cu.reading_dwo_directly. */ | |
594 | struct dwo_unit *dwo_unit; | |
595 | }; | |
596 | ||
c4973306 SM |
597 | /* Open the separate '.dwz' debug file, if needed. Return NULL if |
598 | there is no .gnu_debugaltlink section in the file. Error if there | |
599 | is such a section but the file cannot be found. */ | |
600 | ||
c3699833 | 601 | extern dwz_file *dwarf2_get_dwz_file (dwarf2_per_bfd *per_bfd); |
c4973306 | 602 | |
8cb5117c SM |
603 | /* Return the type of the DIE at DIE_OFFSET in the CU named by |
604 | PER_CU. */ | |
605 | ||
606 | struct type *dwarf2_get_die_type (cu_offset die_offset, | |
aa66c379 SM |
607 | dwarf2_per_cu_data *per_cu, |
608 | dwarf2_per_objfile *per_objfile); | |
8cb5117c | 609 | |
450a1bfc SM |
610 | /* Given an index in .debug_addr, fetch the value. |
611 | NOTE: This can be called during dwarf expression evaluation, | |
612 | long after the debug information has been read, and thus per_cu->cu | |
613 | may no longer exist. */ | |
614 | ||
615 | CORE_ADDR dwarf2_read_addr_index (dwarf2_per_cu_data *per_cu, | |
82ca3f51 | 616 | dwarf2_per_objfile *dwarf2_per_objfile, |
450a1bfc SM |
617 | unsigned int addr_index); |
618 | ||
d4c9a4f8 SM |
619 | /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU. |
620 | Returned value is intended for DW_OP_call*. Returned | |
621 | dwarf2_locexpr_baton->data has lifetime of | |
622 | PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */ | |
623 | ||
624 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_sect_off | |
625 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, | |
14095eb3 | 626 | dwarf2_per_objfile *per_objfile, |
d4c9a4f8 SM |
627 | CORE_ADDR (*get_frame_pc) (void *baton), |
628 | void *baton, bool resolve_abstract_p = false); | |
629 | ||
630 | /* Like dwarf2_fetch_die_loc_sect_off, but take a CU | |
631 | offset. */ | |
632 | ||
633 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_cu_off | |
634 | (cu_offset offset_in_cu, dwarf2_per_cu_data *per_cu, | |
14095eb3 | 635 | dwarf2_per_objfile *per_objfile, |
d4c9a4f8 SM |
636 | CORE_ADDR (*get_frame_pc) (void *baton), |
637 | void *baton); | |
638 | ||
639 | /* If the DIE at SECT_OFF in PER_CU has a DW_AT_const_value, return a | |
640 | pointer to the constant bytes and set LEN to the length of the | |
641 | data. If memory is needed, allocate it on OBSTACK. If the DIE | |
642 | does not have a DW_AT_const_value, return NULL. */ | |
643 | ||
644 | extern const gdb_byte *dwarf2_fetch_constant_bytes | |
14095eb3 SM |
645 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, |
646 | dwarf2_per_objfile *per_objfile, obstack *obstack, | |
d4c9a4f8 SM |
647 | LONGEST *len); |
648 | ||
649 | /* Return the type of the die at SECT_OFF in PER_CU. Return NULL if no | |
650 | valid type for this die is found. */ | |
651 | ||
652 | struct type *dwarf2_fetch_die_type_sect_off | |
14095eb3 SM |
653 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, |
654 | dwarf2_per_objfile *per_objfile); | |
d4c9a4f8 | 655 | |
8fdd972c TT |
656 | /* When non-zero, dump line number entries as they are read in. */ |
657 | extern unsigned int dwarf_line_debug; | |
658 | ||
cd4fb1b2 | 659 | #endif /* DWARF2READ_H */ |