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> |
2e6a9f79 | 25 | #include "dwarf2/comp-unit.h" |
82ca8957 | 26 | #include "dwarf2/index-cache.h" |
2c86cff9 | 27 | #include "dwarf2/section.h" |
cd4fb1b2 SM |
28 | #include "filename-seen-cache.h" |
29 | #include "gdb_obstack.h" | |
268a13a5 | 30 | #include "gdbsupport/hash_enum.h" |
891813be | 31 | #include "psympriv.h" |
cd4fb1b2 | 32 | |
3c3bb058 AB |
33 | /* Hold 'maintenance (set|show) dwarf' commands. */ |
34 | extern struct cmd_list_element *set_dwarf_cmdlist; | |
35 | extern struct cmd_list_element *show_dwarf_cmdlist; | |
36 | ||
cd4fb1b2 SM |
37 | struct tu_stats |
38 | { | |
39 | int nr_uniq_abbrev_tables; | |
40 | int nr_symtabs; | |
41 | int nr_symtab_sharers; | |
42 | int nr_stmt_less_type_units; | |
43 | int nr_all_type_units_reallocs; | |
44 | }; | |
45 | ||
46 | struct dwarf2_debug_sections; | |
39856def | 47 | struct dwarf2_per_cu_data; |
cd4fb1b2 SM |
48 | struct mapped_index; |
49 | struct mapped_debug_names; | |
ff4c9fec | 50 | struct signatured_type; |
8adb8487 | 51 | struct type_unit_group; |
cd4fb1b2 | 52 | |
39856def TT |
53 | /* One item on the queue of compilation units to read in full symbols |
54 | for. */ | |
55 | struct dwarf2_queue_item | |
56 | { | |
120ce1b5 SM |
57 | dwarf2_queue_item (dwarf2_per_cu_data *cu, dwarf2_per_objfile *per_objfile, |
58 | enum language lang) | |
39856def | 59 | : per_cu (cu), |
120ce1b5 | 60 | per_objfile (per_objfile), |
39856def TT |
61 | pretend_language (lang) |
62 | { | |
63 | } | |
64 | ||
65 | ~dwarf2_queue_item (); | |
66 | ||
67 | DISABLE_COPY_AND_ASSIGN (dwarf2_queue_item); | |
68 | ||
120ce1b5 SM |
69 | dwarf2_per_cu_data *per_cu; |
70 | dwarf2_per_objfile *per_objfile; | |
39856def TT |
71 | enum language pretend_language; |
72 | }; | |
73 | ||
5989a64e SM |
74 | /* Some DWARF data can be shared across objfiles who share the same BFD, |
75 | this data is stored in this object. | |
cd4fb1b2 | 76 | |
5989a64e SM |
77 | Two dwarf2_per_objfile objects representing objfiles sharing the same BFD |
78 | will point to the same instance of dwarf2_per_bfd, unless the BFD requires | |
79 | relocation. */ | |
80 | ||
81 | struct dwarf2_per_bfd | |
cd4fb1b2 | 82 | { |
5989a64e | 83 | /* Construct a dwarf2_per_bfd for OBFD. NAMES points to the |
cd4fb1b2 | 84 | dwarf2 section names, or is NULL if the standard ELF names are |
4b610737 TT |
85 | used. CAN_COPY is true for formats where symbol |
86 | interposition is possible and so symbol values must follow copy | |
87 | relocation rules. */ | |
5989a64e | 88 | dwarf2_per_bfd (bfd *obfd, const dwarf2_debug_sections *names, bool can_copy); |
cd4fb1b2 | 89 | |
5989a64e | 90 | ~dwarf2_per_bfd (); |
cd4fb1b2 | 91 | |
5989a64e | 92 | DISABLE_COPY_AND_ASSIGN (dwarf2_per_bfd); |
cd4fb1b2 | 93 | |
ff4c9fec SM |
94 | /* Return the CU/TU given its index. |
95 | ||
96 | This is intended for loops like: | |
97 | ||
5989a64e SM |
98 | for (i = 0; i < (dwarf2_per_bfd->n_comp_units |
99 | + dwarf2_per_bfd->n_type_units); ++i) | |
ff4c9fec | 100 | { |
5989a64e | 101 | dwarf2_per_cu_data *per_cu = dwarf2_per_bfd->get_cutu (i); |
ff4c9fec SM |
102 | |
103 | ...; | |
104 | } | |
105 | */ | |
106 | dwarf2_per_cu_data *get_cutu (int index); | |
107 | ||
108 | /* Return the CU given its index. | |
109 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
110 | CU. */ | |
111 | dwarf2_per_cu_data *get_cu (int index); | |
112 | ||
113 | /* Return the TU given its index. | |
114 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
115 | TU. */ | |
116 | signatured_type *get_tu (int index); | |
117 | ||
cd4fb1b2 SM |
118 | /* Free all cached compilation units. */ |
119 | void free_cached_comp_units (); | |
86c0bb4c | 120 | |
d3473f0c TT |
121 | /* A convenience function to allocate a dwarf2_per_cu_data. The |
122 | returned object has its "index" field set properly. The object | |
5989a64e | 123 | is allocated on the dwarf2_per_bfd obstack. */ |
d3473f0c TT |
124 | dwarf2_per_cu_data *allocate_per_cu (); |
125 | ||
126 | /* A convenience function to allocate a signatured_type. The | |
127 | returned object has its "index" field set properly. The object | |
5989a64e | 128 | is allocated on the dwarf2_per_bfd obstack. */ |
d3473f0c TT |
129 | signatured_type *allocate_signatured_type (); |
130 | ||
af758d11 SM |
131 | /* Return the number of partial symtabs allocated with allocate_per_cu |
132 | and allocate_signatured_type so far. */ | |
133 | int num_psymtabs () const | |
134 | { return m_num_psymtabs; } | |
135 | ||
cd4fb1b2 SM |
136 | private: |
137 | /* This function is mapped across the sections and remembers the | |
138 | offset and size of each of the debugging sections we are | |
139 | interested in. */ | |
140 | void locate_sections (bfd *abfd, asection *sectp, | |
141 | const dwarf2_debug_sections &names); | |
142 | ||
143 | public: | |
c3699833 SM |
144 | /* The corresponding BFD. */ |
145 | bfd *obfd; | |
146 | ||
45940949 TT |
147 | /* Objects that can be shared across objfiles are stored in this |
148 | obstack or on the psymtab obstack, while objects that are | |
149 | objfile-specific are stored on the objfile obstack. */ | |
150 | auto_obstack obstack; | |
151 | ||
cd4fb1b2 SM |
152 | dwarf2_section_info info {}; |
153 | dwarf2_section_info abbrev {}; | |
154 | dwarf2_section_info line {}; | |
155 | dwarf2_section_info loc {}; | |
156 | dwarf2_section_info loclists {}; | |
157 | dwarf2_section_info macinfo {}; | |
158 | dwarf2_section_info macro {}; | |
159 | dwarf2_section_info str {}; | |
18a8505e | 160 | dwarf2_section_info str_offsets {}; |
cd4fb1b2 SM |
161 | dwarf2_section_info line_str {}; |
162 | dwarf2_section_info ranges {}; | |
163 | dwarf2_section_info rnglists {}; | |
164 | dwarf2_section_info addr {}; | |
165 | dwarf2_section_info frame {}; | |
166 | dwarf2_section_info eh_frame {}; | |
167 | dwarf2_section_info gdb_index {}; | |
168 | dwarf2_section_info debug_names {}; | |
169 | dwarf2_section_info debug_aranges {}; | |
170 | ||
fd5866f6 | 171 | std::vector<dwarf2_section_info> types; |
cd4fb1b2 | 172 | |
cd4fb1b2 SM |
173 | /* Table of all the compilation units. This is used to locate |
174 | the target compilation unit of a particular reference. */ | |
b76e467d | 175 | std::vector<dwarf2_per_cu_data *> all_comp_units; |
cd4fb1b2 | 176 | |
b2bdb8cf SM |
177 | /* The .debug_types-related CUs (TUs). */ |
178 | std::vector<signatured_type *> all_type_units; | |
cd4fb1b2 SM |
179 | |
180 | /* Table of struct type_unit_group objects. | |
181 | The hash key is the DW_AT_stmt_list value. */ | |
eaa5fa8b | 182 | htab_up type_unit_groups; |
cd4fb1b2 SM |
183 | |
184 | /* A table mapping .debug_types signatures to its signatured_type entry. | |
185 | This is NULL if the .debug_types section hasn't been read in yet. */ | |
b0b6a987 | 186 | htab_up signatured_types; |
cd4fb1b2 SM |
187 | |
188 | /* Type unit statistics, to see how well the scaling improvements | |
189 | are doing. */ | |
190 | struct tu_stats tu_stats {}; | |
191 | ||
192 | /* A chain of compilation units that are currently read in, so that | |
193 | they can be freed later. */ | |
194 | dwarf2_per_cu_data *read_in_chain = NULL; | |
195 | ||
196 | /* A table mapping DW_AT_dwo_name values to struct dwo_file objects. | |
197 | This is NULL if the table hasn't been allocated yet. */ | |
51ac9db5 | 198 | htab_up dwo_files; |
cd4fb1b2 SM |
199 | |
200 | /* True if we've checked for whether there is a DWP file. */ | |
201 | bool dwp_checked = false; | |
202 | ||
203 | /* The DWP file if there is one, or NULL. */ | |
400174b1 | 204 | std::unique_ptr<struct dwp_file> dwp_file; |
cd4fb1b2 SM |
205 | |
206 | /* The shared '.dwz' file, if one exists. This is used when the | |
207 | original data was compressed using 'dwz -m'. */ | |
7ff8cb8c | 208 | std::unique_ptr<struct dwz_file> dwz_file; |
cd4fb1b2 | 209 | |
4b610737 TT |
210 | /* Whether copy relocations are supported by this object format. */ |
211 | bool can_copy; | |
212 | ||
cd4fb1b2 SM |
213 | /* A flag indicating whether this objfile has a section loaded at a |
214 | VMA of 0. */ | |
215 | bool has_section_at_zero = false; | |
216 | ||
217 | /* True if we are using the mapped index, | |
218 | or we are faking it for OBJF_READNOW's sake. */ | |
219 | bool using_index = false; | |
220 | ||
221 | /* The mapped index, or NULL if .gdb_index is missing or not being used. */ | |
3063847f | 222 | std::unique_ptr<mapped_index> index_table; |
cd4fb1b2 SM |
223 | |
224 | /* The mapped index, or NULL if .debug_names is missing or not being used. */ | |
225 | std::unique_ptr<mapped_debug_names> debug_names_table; | |
226 | ||
227 | /* When using index_table, this keeps track of all quick_file_names entries. | |
228 | TUs typically share line table entries with a CU, so we maintain a | |
229 | separate table of all line table entries to support the sharing. | |
230 | Note that while there can be way more TUs than CUs, we've already | |
231 | sorted all the TUs into "type unit groups", grouped by their | |
232 | DW_AT_stmt_list value. Therefore the only sharing done here is with a | |
233 | CU and its associated TU group if there is one. */ | |
5895093f | 234 | htab_up quick_file_names_table; |
cd4fb1b2 SM |
235 | |
236 | /* Set during partial symbol reading, to prevent queueing of full | |
237 | symbols. */ | |
238 | bool reading_partial_symbols = false; | |
239 | ||
cd4fb1b2 | 240 | /* The CUs we recently read. */ |
c5d0225d | 241 | std::vector<dwarf2_per_cu_data *> just_read_cus; |
cd4fb1b2 SM |
242 | |
243 | /* Table containing line_header indexed by offset and offset_in_dwz. */ | |
d15acc42 | 244 | htab_up line_header_hash; |
cd4fb1b2 SM |
245 | |
246 | /* Table containing all filenames. This is an optional because the | |
247 | table is lazily constructed on first access. */ | |
248 | gdb::optional<filename_seen_cache> filenames_cache; | |
87d6a7aa SM |
249 | |
250 | /* If we loaded the index from an external file, this contains the | |
251 | resources associated to the open file, memory mapping, etc. */ | |
252 | std::unique_ptr<index_cache_resource> index_cache_res; | |
e4a62c65 TV |
253 | |
254 | /* Mapping from abstract origin DIE to concrete DIEs that reference it as | |
255 | DW_AT_abstract_origin. */ | |
fad03f6e TT |
256 | std::unordered_map<sect_offset, std::vector<sect_offset>, |
257 | gdb::hash_enum<sect_offset>> | |
e4a62c65 | 258 | abstract_to_concrete; |
39856def TT |
259 | |
260 | /* CUs that are queued to be read. */ | |
261 | std::queue<dwarf2_queue_item> queue; | |
d3473f0c TT |
262 | |
263 | private: | |
264 | ||
265 | /* The total number of per_cu and signatured_type objects that have | |
266 | been created so far for this reader. */ | |
267 | size_t m_num_psymtabs = 0; | |
cd4fb1b2 SM |
268 | }; |
269 | ||
8adb8487 TT |
270 | /* This is the per-objfile data associated with a type_unit_group. */ |
271 | ||
272 | struct type_unit_group_unshareable | |
273 | { | |
274 | /* The compunit symtab. | |
275 | Type units in a group needn't all be defined in the same source file, | |
276 | so we create an essentially anonymous symtab as the compunit symtab. */ | |
277 | struct compunit_symtab *compunit_symtab = nullptr; | |
278 | ||
279 | /* The number of symtabs from the line header. | |
280 | The value here must match line_header.num_file_names. */ | |
281 | unsigned int num_symtabs = 0; | |
282 | ||
283 | /* The symbol tables for this TU (obtained from the files listed in | |
284 | DW_AT_stmt_list). | |
285 | WARNING: The order of entries here must match the order of entries | |
286 | in the line header. After the first TU using this type_unit_group, the | |
287 | line header for the subsequent TUs is recreated from this. This is done | |
288 | because we need to use the same symtabs for each TU using the same | |
289 | DW_AT_stmt_list value. Also note that symtabs may be repeated here, | |
290 | there's no guarantee the line header doesn't have duplicate entries. */ | |
291 | struct symtab **symtabs = nullptr; | |
292 | }; | |
293 | ||
5989a64e SM |
294 | /* Collection of data recorded per objfile. |
295 | This hangs off of dwarf2_objfile_data_key. | |
296 | ||
297 | Some DWARF data cannot (currently) be shared across objfiles. Such | |
298 | data is stored in this object. */ | |
299 | ||
300 | struct dwarf2_per_objfile | |
301 | { | |
302 | dwarf2_per_objfile (struct objfile *objfile, dwarf2_per_bfd *per_bfd) | |
303 | : objfile (objfile), per_bfd (per_bfd) | |
304 | {} | |
305 | ||
306 | /* Return pointer to string at .debug_line_str offset as read from BUF. | |
307 | BUF is assumed to be in a compilation unit described by CU_HEADER. | |
308 | Return *BYTES_READ_PTR count of bytes read from BUF. */ | |
309 | const char *read_line_string (const gdb_byte *buf, | |
310 | const struct comp_unit_head *cu_header, | |
311 | unsigned int *bytes_read_ptr); | |
312 | ||
af758d11 SM |
313 | /* Resize the M_SYMTABS vector to the needed size (the number of partial |
314 | symtabs allocated by the per-bfd). */ | |
315 | void resize_symtabs () | |
316 | { | |
317 | /* The symtabs vector should only grow, not shrink. */ | |
318 | gdb_assert (per_bfd->num_psymtabs () >= m_symtabs.size ()); | |
319 | ||
320 | m_symtabs.resize (per_bfd->num_psymtabs ()); | |
321 | } | |
322 | ||
323 | /* Return true if the symtab corresponding to PER_CU has been set, | |
324 | false otherwise. */ | |
325 | bool symtab_set_p (const dwarf2_per_cu_data *per_cu) const; | |
326 | ||
327 | /* Return the compunit_symtab associated to PER_CU, if it has been created. */ | |
328 | compunit_symtab *get_symtab (const dwarf2_per_cu_data *per_cu) const; | |
329 | ||
330 | /* Set the compunit_symtab associated to PER_CU. */ | |
331 | void set_symtab (const dwarf2_per_cu_data *per_cu, compunit_symtab *symtab); | |
332 | ||
e286671b TT |
333 | /* Get the type_unit_group_unshareable corresponding to TU_GROUP. If one |
334 | does not exist, create it. */ | |
8adb8487 TT |
335 | type_unit_group_unshareable *get_type_unit_group_unshareable |
336 | (type_unit_group *tu_group); | |
337 | ||
e286671b TT |
338 | struct type *get_type_for_signatured_type (signatured_type *sig_type) const; |
339 | ||
340 | void set_type_for_signatured_type (signatured_type *sig_type, | |
341 | struct type *type); | |
342 | ||
293e7e51 SM |
343 | /* Find an integer type SIZE_IN_BYTES bytes in size and return it. |
344 | UNSIGNED_P controls if the integer is unsigned or not. */ | |
345 | struct type *int_type (int size_in_bytes, bool unsigned_p) const; | |
346 | ||
5989a64e SM |
347 | /* Back link. */ |
348 | struct objfile *objfile; | |
349 | ||
350 | /* Pointer to the data that is (possibly) shared between this objfile and | |
351 | other objfiles backed by the same BFD. */ | |
352 | struct dwarf2_per_bfd *per_bfd; | |
af758d11 | 353 | |
ae090bdb SM |
354 | /* Table mapping type DIEs to their struct type *. |
355 | This is nullptr if not allocated yet. | |
356 | The mapping is done via (CU/TU + DIE offset) -> type. */ | |
357 | htab_up die_type_hash; | |
358 | ||
af758d11 SM |
359 | private: |
360 | /* Hold the corresponding compunit_symtab for each CU or TU. This | |
361 | is indexed by dwarf2_per_cu_data::index. A NULL value means | |
362 | that the CU/TU has not been expanded yet. */ | |
363 | std::vector<compunit_symtab *> m_symtabs; | |
8adb8487 TT |
364 | |
365 | /* Map from a type unit group to the corresponding unshared | |
366 | structure. */ | |
367 | typedef std::unique_ptr<type_unit_group_unshareable> | |
368 | type_unit_group_unshareable_up; | |
369 | ||
370 | std::unordered_map<type_unit_group *, type_unit_group_unshareable_up> | |
371 | m_type_units; | |
e286671b TT |
372 | |
373 | /* Map from signatured types to the corresponding struct type. */ | |
374 | std::unordered_map<signatured_type *, struct type *> m_type_map; | |
5989a64e SM |
375 | }; |
376 | ||
cd4fb1b2 SM |
377 | /* Get the dwarf2_per_objfile associated to OBJFILE. */ |
378 | ||
379 | dwarf2_per_objfile *get_dwarf2_per_objfile (struct objfile *objfile); | |
380 | ||
891813be | 381 | /* A partial symtab specialized for DWARF. */ |
af758d11 | 382 | struct dwarf2_psymtab : public partial_symtab |
891813be | 383 | { |
891813be | 384 | dwarf2_psymtab (const char *filename, struct objfile *objfile, |
9f4e76a4 | 385 | dwarf2_per_cu_data *per_cu) |
af758d11 | 386 | : partial_symtab (filename, objfile, 0), |
9f4e76a4 | 387 | per_cu_data (per_cu) |
891813be TT |
388 | { |
389 | } | |
390 | ||
391 | void read_symtab (struct objfile *) override; | |
8566b89b | 392 | void expand_psymtab (struct objfile *) override; |
af758d11 SM |
393 | bool readin_p (struct objfile *) const override; |
394 | compunit_symtab *get_compunit_symtab (struct objfile *) const override; | |
891813be TT |
395 | |
396 | struct dwarf2_per_cu_data *per_cu_data; | |
397 | }; | |
398 | ||
cd4fb1b2 SM |
399 | /* Persistent data held for a compilation unit, even when not |
400 | processing it. We put a pointer to this structure in the | |
891813be | 401 | psymtab. */ |
cd4fb1b2 SM |
402 | |
403 | struct dwarf2_per_cu_data | |
404 | { | |
405 | /* The start offset and length of this compilation unit. | |
406 | NOTE: Unlike comp_unit_head.length, this length includes | |
407 | initial_length_size. | |
408 | If the DIE refers to a DWO file, this is always of the original die, | |
409 | not the DWO file. */ | |
410 | sect_offset sect_off; | |
411 | unsigned int length; | |
412 | ||
413 | /* DWARF standard version this data has been read from (such as 4 or 5). */ | |
414 | short dwarf_version; | |
415 | ||
416 | /* Flag indicating this compilation unit will be read in before | |
417 | any of the current compilation units are processed. */ | |
418 | unsigned int queued : 1; | |
419 | ||
420 | /* This flag will be set when reading partial DIEs if we need to load | |
421 | absolutely all DIEs for this compilation unit, instead of just the ones | |
422 | we think are interesting. It gets set if we look for a DIE in the | |
423 | hash table and don't find it. */ | |
424 | unsigned int load_all_dies : 1; | |
425 | ||
426 | /* Non-zero if this CU is from .debug_types. | |
427 | Struct dwarf2_per_cu_data is contained in struct signatured_type iff | |
428 | this is non-zero. */ | |
429 | unsigned int is_debug_types : 1; | |
430 | ||
431 | /* Non-zero if this CU is from the .dwz file. */ | |
432 | unsigned int is_dwz : 1; | |
433 | ||
434 | /* Non-zero if reading a TU directly from a DWO file, bypassing the stub. | |
435 | This flag is only valid if is_debug_types is true. | |
436 | We can't read a CU directly from a DWO file: There are required | |
437 | attributes in the stub. */ | |
438 | unsigned int reading_dwo_directly : 1; | |
439 | ||
440 | /* Non-zero if the TU has been read. | |
441 | This is used to assist the "Stay in DWO Optimization" for Fission: | |
442 | When reading a DWO, it's faster to read TUs from the DWO instead of | |
443 | fetching them from random other DWOs (due to comdat folding). | |
444 | If the TU has already been read, the optimization is unnecessary | |
445 | (and unwise - we don't want to change where gdb thinks the TU lives | |
446 | "midflight"). | |
447 | This flag is only valid if is_debug_types is true. */ | |
448 | unsigned int tu_read : 1; | |
449 | ||
d3473f0c TT |
450 | /* Our index in the unshared "symtabs" vector. */ |
451 | unsigned index; | |
452 | ||
cd4fb1b2 SM |
453 | /* The section this CU/TU lives in. |
454 | If the DIE refers to a DWO file, this is always the original die, | |
455 | not the DWO file. */ | |
456 | struct dwarf2_section_info *section; | |
457 | ||
458 | /* Set to non-NULL iff this CU is currently loaded. When it gets freed out | |
459 | of the CU cache it gets reset to NULL again. This is left as NULL for | |
460 | dummy CUs (a CU header, but nothing else). */ | |
461 | struct dwarf2_cu *cu; | |
462 | ||
58990295 TV |
463 | /* The unit type of this CU. */ |
464 | enum dwarf_unit_type unit_type; | |
465 | ||
466 | /* The language of this CU. */ | |
467 | enum language lang; | |
468 | ||
1859c670 SM |
469 | /* Backlink to the owner of this. */ |
470 | dwarf2_per_bfd *per_bfd; | |
471 | ||
2e6a9f79 SM |
472 | /* DWARF header of this CU. Note that dwarf2_cu reads its own version of the |
473 | header, which may differ from this one, since it may pass rcuh_kind::TYPE | |
474 | to read_comp_unit_head, whereas for dwarf2_per_cu_data we always pass | |
475 | rcuh_kind::COMPILE. | |
476 | ||
477 | Don't access this field directly, use the get_header method instead. It | |
478 | should be private, but we can't make it private at the moment. */ | |
479 | mutable comp_unit_head m_header; | |
480 | ||
481 | /* True if HEADER has been read in. | |
482 | ||
483 | Don't access this field directly. It should be private, but we can't make | |
484 | it private at the moment. */ | |
485 | mutable bool m_header_read_in; | |
486 | ||
5989a64e | 487 | /* When dwarf2_per_bfd::using_index is true, the 'quick' field |
cd4fb1b2 SM |
488 | is active. Otherwise, the 'psymtab' field is active. */ |
489 | union | |
490 | { | |
491 | /* The partial symbol table associated with this compilation unit, | |
492 | or NULL for unread partial units. */ | |
891813be | 493 | dwarf2_psymtab *psymtab; |
cd4fb1b2 SM |
494 | |
495 | /* Data needed by the "quick" functions. */ | |
496 | struct dwarf2_per_cu_quick_data *quick; | |
497 | } v; | |
498 | ||
96c738c0 TT |
499 | /* The CUs we import using DW_TAG_imported_unit. This is filled in |
500 | while reading psymtabs, used to compute the psymtab dependencies, | |
501 | and then cleared. Then it is filled in again while reading full | |
502 | symbols, and only deleted when the objfile is destroyed. | |
503 | ||
504 | This is also used to work around a difference between the way gold | |
505 | generates .gdb_index version <=7 and the way gdb does. Arguably this | |
506 | is a gold bug. For symbols coming from TUs, gold records in the index | |
507 | the CU that includes the TU instead of the TU itself. This breaks | |
508 | dw2_lookup_symbol: It assumes that if the index says symbol X lives | |
509 | in CU/TU Y, then one need only expand Y and a subsequent lookup in Y | |
510 | will find X. Alas TUs live in their own symtab, so after expanding CU Y | |
511 | we need to look in TU Z to find X. Fortunately, this is akin to | |
512 | DW_TAG_imported_unit, so we just use the same mechanism: For | |
513 | .gdb_index version <=7 this also records the TUs that the CU referred | |
514 | to. Concurrently with this change gdb was modified to emit version 8 | |
515 | indices so we only pay a price for gold generated indices. | |
516 | http://sourceware.org/bugzilla/show_bug.cgi?id=15021. | |
517 | ||
518 | This currently needs to be a public member due to how | |
519 | dwarf2_per_cu_data is allocated and used. Ideally in future things | |
520 | could be refactored to make this private. Until then please try to | |
521 | avoid direct access to this member, and instead use the helper | |
522 | functions above. */ | |
523 | std::vector <dwarf2_per_cu_data *> *imported_symtabs; | |
524 | ||
ae640021 AB |
525 | /* Return true of IMPORTED_SYMTABS is empty or not yet allocated. */ |
526 | bool imported_symtabs_empty () const | |
527 | { | |
528 | return (imported_symtabs == nullptr || imported_symtabs->empty ()); | |
529 | } | |
530 | ||
531 | /* Push P to the back of IMPORTED_SYMTABS, allocated IMPORTED_SYMTABS | |
532 | first if required. */ | |
533 | void imported_symtabs_push (dwarf2_per_cu_data *p) | |
534 | { | |
535 | if (imported_symtabs == nullptr) | |
536 | imported_symtabs = new std::vector <dwarf2_per_cu_data *>; | |
537 | imported_symtabs->push_back (p); | |
538 | } | |
539 | ||
540 | /* Return the size of IMPORTED_SYMTABS if it is allocated, otherwise | |
541 | return 0. */ | |
542 | size_t imported_symtabs_size () const | |
543 | { | |
544 | if (imported_symtabs == nullptr) | |
545 | return 0; | |
546 | return imported_symtabs->size (); | |
547 | } | |
548 | ||
549 | /* Delete IMPORTED_SYMTABS and set the pointer back to nullptr. */ | |
550 | void imported_symtabs_free () | |
551 | { | |
552 | delete imported_symtabs; | |
553 | imported_symtabs = nullptr; | |
554 | } | |
09ba997f | 555 | |
2e6a9f79 SM |
556 | /* Get the header of this per_cu, reading it if necessary. */ |
557 | const comp_unit_head *get_header () const; | |
558 | ||
09ba997f TT |
559 | /* Return the address size given in the compilation unit header for |
560 | this CU. */ | |
561 | int addr_size () const; | |
562 | ||
563 | /* Return the offset size given in the compilation unit header for | |
564 | this CU. */ | |
565 | int offset_size () const; | |
566 | ||
567 | /* Return the DW_FORM_ref_addr size given in the compilation unit | |
568 | header for this CU. */ | |
569 | int ref_addr_size () const; | |
570 | ||
09ba997f TT |
571 | /* Return DWARF version number of this CU. */ |
572 | short version () const | |
573 | { | |
574 | return dwarf_version; | |
575 | } | |
197400e8 TT |
576 | |
577 | /* A type unit group has a per_cu object that is recognized by | |
578 | having no section. */ | |
579 | bool type_unit_group_p () const | |
580 | { | |
581 | return section == nullptr; | |
582 | } | |
cd4fb1b2 SM |
583 | }; |
584 | ||
585 | /* Entry in the signatured_types hash table. */ | |
586 | ||
587 | struct signatured_type | |
588 | { | |
589 | /* The "per_cu" object of this type. | |
590 | This struct is used iff per_cu.is_debug_types. | |
591 | N.B.: This is the first member so that it's easy to convert pointers | |
592 | between them. */ | |
593 | struct dwarf2_per_cu_data per_cu; | |
594 | ||
595 | /* The type's signature. */ | |
596 | ULONGEST signature; | |
597 | ||
598 | /* Offset in the TU of the type's DIE, as read from the TU header. | |
599 | If this TU is a DWO stub and the definition lives in a DWO file | |
600 | (specified by DW_AT_GNU_dwo_name), this value is unusable. */ | |
601 | cu_offset type_offset_in_tu; | |
602 | ||
603 | /* Offset in the section of the type's DIE. | |
604 | If the definition lives in a DWO file, this is the offset in the | |
605 | .debug_types.dwo section. | |
606 | The value is zero until the actual value is known. | |
607 | Zero is otherwise not a valid section offset. */ | |
608 | sect_offset type_offset_in_section; | |
609 | ||
610 | /* Type units are grouped by their DW_AT_stmt_list entry so that they | |
611 | can share them. This points to the containing symtab. */ | |
612 | struct type_unit_group *type_unit_group; | |
613 | ||
cd4fb1b2 SM |
614 | /* Containing DWO unit. |
615 | This field is valid iff per_cu.reading_dwo_directly. */ | |
616 | struct dwo_unit *dwo_unit; | |
617 | }; | |
618 | ||
c4973306 SM |
619 | /* Open the separate '.dwz' debug file, if needed. Return NULL if |
620 | there is no .gnu_debugaltlink section in the file. Error if there | |
621 | is such a section but the file cannot be found. */ | |
622 | ||
c3699833 | 623 | extern dwz_file *dwarf2_get_dwz_file (dwarf2_per_bfd *per_bfd); |
c4973306 | 624 | |
8cb5117c SM |
625 | /* Return the type of the DIE at DIE_OFFSET in the CU named by |
626 | PER_CU. */ | |
627 | ||
628 | struct type *dwarf2_get_die_type (cu_offset die_offset, | |
aa66c379 SM |
629 | dwarf2_per_cu_data *per_cu, |
630 | dwarf2_per_objfile *per_objfile); | |
8cb5117c | 631 | |
450a1bfc SM |
632 | /* Given an index in .debug_addr, fetch the value. |
633 | NOTE: This can be called during dwarf expression evaluation, | |
634 | long after the debug information has been read, and thus per_cu->cu | |
635 | may no longer exist. */ | |
636 | ||
637 | CORE_ADDR dwarf2_read_addr_index (dwarf2_per_cu_data *per_cu, | |
82ca3f51 | 638 | dwarf2_per_objfile *dwarf2_per_objfile, |
450a1bfc SM |
639 | unsigned int addr_index); |
640 | ||
d4c9a4f8 SM |
641 | /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU. |
642 | Returned value is intended for DW_OP_call*. Returned | |
643 | dwarf2_locexpr_baton->data has lifetime of | |
644 | PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */ | |
645 | ||
646 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_sect_off | |
647 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, | |
14095eb3 | 648 | dwarf2_per_objfile *per_objfile, |
d4c9a4f8 SM |
649 | CORE_ADDR (*get_frame_pc) (void *baton), |
650 | void *baton, bool resolve_abstract_p = false); | |
651 | ||
652 | /* Like dwarf2_fetch_die_loc_sect_off, but take a CU | |
653 | offset. */ | |
654 | ||
655 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_cu_off | |
656 | (cu_offset offset_in_cu, dwarf2_per_cu_data *per_cu, | |
14095eb3 | 657 | dwarf2_per_objfile *per_objfile, |
d4c9a4f8 SM |
658 | CORE_ADDR (*get_frame_pc) (void *baton), |
659 | void *baton); | |
660 | ||
661 | /* If the DIE at SECT_OFF in PER_CU has a DW_AT_const_value, return a | |
662 | pointer to the constant bytes and set LEN to the length of the | |
663 | data. If memory is needed, allocate it on OBSTACK. If the DIE | |
664 | does not have a DW_AT_const_value, return NULL. */ | |
665 | ||
666 | extern const gdb_byte *dwarf2_fetch_constant_bytes | |
14095eb3 SM |
667 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, |
668 | dwarf2_per_objfile *per_objfile, obstack *obstack, | |
d4c9a4f8 SM |
669 | LONGEST *len); |
670 | ||
671 | /* Return the type of the die at SECT_OFF in PER_CU. Return NULL if no | |
672 | valid type for this die is found. */ | |
673 | ||
674 | struct type *dwarf2_fetch_die_type_sect_off | |
14095eb3 SM |
675 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, |
676 | dwarf2_per_objfile *per_objfile); | |
d4c9a4f8 | 677 | |
8fdd972c TT |
678 | /* When non-zero, dump line number entries as they are read in. */ |
679 | extern unsigned int dwarf_line_debug; | |
680 | ||
cd4fb1b2 | 681 | #endif /* DWARF2READ_H */ |