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; |
cd4fb1b2 | 50 | |
39856def TT |
51 | /* One item on the queue of compilation units to read in full symbols |
52 | for. */ | |
53 | struct dwarf2_queue_item | |
54 | { | |
55 | dwarf2_queue_item (dwarf2_per_cu_data *cu, enum language lang) | |
56 | : per_cu (cu), | |
57 | pretend_language (lang) | |
58 | { | |
59 | } | |
60 | ||
61 | ~dwarf2_queue_item (); | |
62 | ||
63 | DISABLE_COPY_AND_ASSIGN (dwarf2_queue_item); | |
64 | ||
65 | struct dwarf2_per_cu_data *per_cu; | |
66 | enum language pretend_language; | |
67 | }; | |
68 | ||
cd4fb1b2 SM |
69 | /* Collection of data recorded per objfile. |
70 | This hangs off of dwarf2_objfile_data_key. */ | |
71 | ||
5bfd760d | 72 | struct dwarf2_per_objfile |
cd4fb1b2 SM |
73 | { |
74 | /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the | |
75 | dwarf2 section names, or is NULL if the standard ELF names are | |
4b610737 TT |
76 | used. CAN_COPY is true for formats where symbol |
77 | interposition is possible and so symbol values must follow copy | |
78 | relocation rules. */ | |
cd4fb1b2 | 79 | dwarf2_per_objfile (struct objfile *objfile, |
4b610737 TT |
80 | const dwarf2_debug_sections *names, |
81 | bool can_copy); | |
cd4fb1b2 SM |
82 | |
83 | ~dwarf2_per_objfile (); | |
84 | ||
85 | DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile); | |
86 | ||
ff4c9fec SM |
87 | /* Return the CU/TU given its index. |
88 | ||
89 | This is intended for loops like: | |
90 | ||
91 | for (i = 0; i < (dwarf2_per_objfile->n_comp_units | |
92 | + dwarf2_per_objfile->n_type_units); ++i) | |
93 | { | |
94 | dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i); | |
95 | ||
96 | ...; | |
97 | } | |
98 | */ | |
99 | dwarf2_per_cu_data *get_cutu (int index); | |
100 | ||
101 | /* Return the CU given its index. | |
102 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
103 | CU. */ | |
104 | dwarf2_per_cu_data *get_cu (int index); | |
105 | ||
106 | /* Return the TU given its index. | |
107 | This differs from get_cutu in that it's for when you know INDEX refers to a | |
108 | TU. */ | |
109 | signatured_type *get_tu (int index); | |
110 | ||
cd4fb1b2 SM |
111 | /* Free all cached compilation units. */ |
112 | void free_cached_comp_units (); | |
86c0bb4c TT |
113 | |
114 | /* Return pointer to string at .debug_line_str offset as read from BUF. | |
115 | BUF is assumed to be in a compilation unit described by CU_HEADER. | |
116 | Return *BYTES_READ_PTR count of bytes read from BUF. */ | |
117 | const char *read_line_string (const gdb_byte *buf, | |
118 | const struct comp_unit_head *cu_header, | |
119 | unsigned int *bytes_read_ptr); | |
120 | ||
cd4fb1b2 SM |
121 | private: |
122 | /* This function is mapped across the sections and remembers the | |
123 | offset and size of each of the debugging sections we are | |
124 | interested in. */ | |
125 | void locate_sections (bfd *abfd, asection *sectp, | |
126 | const dwarf2_debug_sections &names); | |
127 | ||
128 | public: | |
129 | dwarf2_section_info info {}; | |
130 | dwarf2_section_info abbrev {}; | |
131 | dwarf2_section_info line {}; | |
132 | dwarf2_section_info loc {}; | |
133 | dwarf2_section_info loclists {}; | |
134 | dwarf2_section_info macinfo {}; | |
135 | dwarf2_section_info macro {}; | |
136 | dwarf2_section_info str {}; | |
18a8505e | 137 | dwarf2_section_info str_offsets {}; |
cd4fb1b2 SM |
138 | dwarf2_section_info line_str {}; |
139 | dwarf2_section_info ranges {}; | |
140 | dwarf2_section_info rnglists {}; | |
141 | dwarf2_section_info addr {}; | |
142 | dwarf2_section_info frame {}; | |
143 | dwarf2_section_info eh_frame {}; | |
144 | dwarf2_section_info gdb_index {}; | |
145 | dwarf2_section_info debug_names {}; | |
146 | dwarf2_section_info debug_aranges {}; | |
147 | ||
fd5866f6 | 148 | std::vector<dwarf2_section_info> types; |
cd4fb1b2 SM |
149 | |
150 | /* Back link. */ | |
151 | struct objfile *objfile = NULL; | |
152 | ||
153 | /* Table of all the compilation units. This is used to locate | |
154 | the target compilation unit of a particular reference. */ | |
b76e467d | 155 | std::vector<dwarf2_per_cu_data *> all_comp_units; |
cd4fb1b2 | 156 | |
b2bdb8cf SM |
157 | /* The .debug_types-related CUs (TUs). */ |
158 | std::vector<signatured_type *> all_type_units; | |
cd4fb1b2 SM |
159 | |
160 | /* Table of struct type_unit_group objects. | |
161 | The hash key is the DW_AT_stmt_list value. */ | |
eaa5fa8b | 162 | htab_up type_unit_groups; |
cd4fb1b2 SM |
163 | |
164 | /* A table mapping .debug_types signatures to its signatured_type entry. | |
165 | This is NULL if the .debug_types section hasn't been read in yet. */ | |
b0b6a987 | 166 | htab_up signatured_types; |
cd4fb1b2 SM |
167 | |
168 | /* Type unit statistics, to see how well the scaling improvements | |
169 | are doing. */ | |
170 | struct tu_stats tu_stats {}; | |
171 | ||
172 | /* A chain of compilation units that are currently read in, so that | |
173 | they can be freed later. */ | |
174 | dwarf2_per_cu_data *read_in_chain = NULL; | |
175 | ||
176 | /* A table mapping DW_AT_dwo_name values to struct dwo_file objects. | |
177 | This is NULL if the table hasn't been allocated yet. */ | |
51ac9db5 | 178 | htab_up dwo_files; |
cd4fb1b2 SM |
179 | |
180 | /* True if we've checked for whether there is a DWP file. */ | |
181 | bool dwp_checked = false; | |
182 | ||
183 | /* The DWP file if there is one, or NULL. */ | |
400174b1 | 184 | std::unique_ptr<struct dwp_file> dwp_file; |
cd4fb1b2 SM |
185 | |
186 | /* The shared '.dwz' file, if one exists. This is used when the | |
187 | original data was compressed using 'dwz -m'. */ | |
7ff8cb8c | 188 | std::unique_ptr<struct dwz_file> dwz_file; |
cd4fb1b2 | 189 | |
4b610737 TT |
190 | /* Whether copy relocations are supported by this object format. */ |
191 | bool can_copy; | |
192 | ||
cd4fb1b2 SM |
193 | /* A flag indicating whether this objfile has a section loaded at a |
194 | VMA of 0. */ | |
195 | bool has_section_at_zero = false; | |
196 | ||
197 | /* True if we are using the mapped index, | |
198 | or we are faking it for OBJF_READNOW's sake. */ | |
199 | bool using_index = false; | |
200 | ||
201 | /* The mapped index, or NULL if .gdb_index is missing or not being used. */ | |
3063847f | 202 | std::unique_ptr<mapped_index> index_table; |
cd4fb1b2 SM |
203 | |
204 | /* The mapped index, or NULL if .debug_names is missing or not being used. */ | |
205 | std::unique_ptr<mapped_debug_names> debug_names_table; | |
206 | ||
207 | /* When using index_table, this keeps track of all quick_file_names entries. | |
208 | TUs typically share line table entries with a CU, so we maintain a | |
209 | separate table of all line table entries to support the sharing. | |
210 | Note that while there can be way more TUs than CUs, we've already | |
211 | sorted all the TUs into "type unit groups", grouped by their | |
212 | DW_AT_stmt_list value. Therefore the only sharing done here is with a | |
213 | CU and its associated TU group if there is one. */ | |
5895093f | 214 | htab_up quick_file_names_table; |
cd4fb1b2 SM |
215 | |
216 | /* Set during partial symbol reading, to prevent queueing of full | |
217 | symbols. */ | |
218 | bool reading_partial_symbols = false; | |
219 | ||
220 | /* Table mapping type DIEs to their struct type *. | |
221 | This is NULL if not allocated yet. | |
222 | The mapping is done via (CU/TU + DIE offset) -> type. */ | |
0335378b | 223 | htab_up die_type_hash; |
cd4fb1b2 SM |
224 | |
225 | /* The CUs we recently read. */ | |
c5d0225d | 226 | std::vector<dwarf2_per_cu_data *> just_read_cus; |
cd4fb1b2 SM |
227 | |
228 | /* Table containing line_header indexed by offset and offset_in_dwz. */ | |
d15acc42 | 229 | htab_up line_header_hash; |
cd4fb1b2 SM |
230 | |
231 | /* Table containing all filenames. This is an optional because the | |
232 | table is lazily constructed on first access. */ | |
233 | gdb::optional<filename_seen_cache> filenames_cache; | |
87d6a7aa SM |
234 | |
235 | /* If we loaded the index from an external file, this contains the | |
236 | resources associated to the open file, memory mapping, etc. */ | |
237 | std::unique_ptr<index_cache_resource> index_cache_res; | |
e4a62c65 TV |
238 | |
239 | /* Mapping from abstract origin DIE to concrete DIEs that reference it as | |
240 | DW_AT_abstract_origin. */ | |
fad03f6e TT |
241 | std::unordered_map<sect_offset, std::vector<sect_offset>, |
242 | gdb::hash_enum<sect_offset>> | |
e4a62c65 | 243 | abstract_to_concrete; |
39856def TT |
244 | |
245 | /* CUs that are queued to be read. */ | |
246 | std::queue<dwarf2_queue_item> queue; | |
cd4fb1b2 SM |
247 | }; |
248 | ||
249 | /* Get the dwarf2_per_objfile associated to OBJFILE. */ | |
250 | ||
251 | dwarf2_per_objfile *get_dwarf2_per_objfile (struct objfile *objfile); | |
252 | ||
891813be | 253 | /* A partial symtab specialized for DWARF. */ |
128a391f | 254 | struct dwarf2_psymtab : public standard_psymtab |
891813be | 255 | { |
891813be | 256 | dwarf2_psymtab (const char *filename, struct objfile *objfile, |
9f4e76a4 SM |
257 | dwarf2_per_cu_data *per_cu) |
258 | : standard_psymtab (filename, objfile, 0), | |
259 | per_cu_data (per_cu) | |
891813be TT |
260 | { |
261 | } | |
262 | ||
263 | void read_symtab (struct objfile *) override; | |
8566b89b | 264 | void expand_psymtab (struct objfile *) override; |
891813be TT |
265 | |
266 | struct dwarf2_per_cu_data *per_cu_data; | |
267 | }; | |
268 | ||
cd4fb1b2 SM |
269 | /* Persistent data held for a compilation unit, even when not |
270 | processing it. We put a pointer to this structure in the | |
891813be | 271 | psymtab. */ |
cd4fb1b2 SM |
272 | |
273 | struct dwarf2_per_cu_data | |
274 | { | |
275 | /* The start offset and length of this compilation unit. | |
276 | NOTE: Unlike comp_unit_head.length, this length includes | |
277 | initial_length_size. | |
278 | If the DIE refers to a DWO file, this is always of the original die, | |
279 | not the DWO file. */ | |
280 | sect_offset sect_off; | |
281 | unsigned int length; | |
282 | ||
283 | /* DWARF standard version this data has been read from (such as 4 or 5). */ | |
284 | short dwarf_version; | |
285 | ||
286 | /* Flag indicating this compilation unit will be read in before | |
287 | any of the current compilation units are processed. */ | |
288 | unsigned int queued : 1; | |
289 | ||
290 | /* This flag will be set when reading partial DIEs if we need to load | |
291 | absolutely all DIEs for this compilation unit, instead of just the ones | |
292 | we think are interesting. It gets set if we look for a DIE in the | |
293 | hash table and don't find it. */ | |
294 | unsigned int load_all_dies : 1; | |
295 | ||
296 | /* Non-zero if this CU is from .debug_types. | |
297 | Struct dwarf2_per_cu_data is contained in struct signatured_type iff | |
298 | this is non-zero. */ | |
299 | unsigned int is_debug_types : 1; | |
300 | ||
301 | /* Non-zero if this CU is from the .dwz file. */ | |
302 | unsigned int is_dwz : 1; | |
303 | ||
304 | /* Non-zero if reading a TU directly from a DWO file, bypassing the stub. | |
305 | This flag is only valid if is_debug_types is true. | |
306 | We can't read a CU directly from a DWO file: There are required | |
307 | attributes in the stub. */ | |
308 | unsigned int reading_dwo_directly : 1; | |
309 | ||
310 | /* Non-zero if the TU has been read. | |
311 | This is used to assist the "Stay in DWO Optimization" for Fission: | |
312 | When reading a DWO, it's faster to read TUs from the DWO instead of | |
313 | fetching them from random other DWOs (due to comdat folding). | |
314 | If the TU has already been read, the optimization is unnecessary | |
315 | (and unwise - we don't want to change where gdb thinks the TU lives | |
316 | "midflight"). | |
317 | This flag is only valid if is_debug_types is true. */ | |
318 | unsigned int tu_read : 1; | |
319 | ||
320 | /* The section this CU/TU lives in. | |
321 | If the DIE refers to a DWO file, this is always the original die, | |
322 | not the DWO file. */ | |
323 | struct dwarf2_section_info *section; | |
324 | ||
325 | /* Set to non-NULL iff this CU is currently loaded. When it gets freed out | |
326 | of the CU cache it gets reset to NULL again. This is left as NULL for | |
327 | dummy CUs (a CU header, but nothing else). */ | |
328 | struct dwarf2_cu *cu; | |
329 | ||
58990295 TV |
330 | /* The unit type of this CU. */ |
331 | enum dwarf_unit_type unit_type; | |
332 | ||
333 | /* The language of this CU. */ | |
334 | enum language lang; | |
335 | ||
cd4fb1b2 SM |
336 | /* The corresponding dwarf2_per_objfile. */ |
337 | struct dwarf2_per_objfile *dwarf2_per_objfile; | |
338 | ||
339 | /* When dwarf2_per_objfile->using_index is true, the 'quick' field | |
340 | is active. Otherwise, the 'psymtab' field is active. */ | |
341 | union | |
342 | { | |
343 | /* The partial symbol table associated with this compilation unit, | |
344 | or NULL for unread partial units. */ | |
891813be | 345 | dwarf2_psymtab *psymtab; |
cd4fb1b2 SM |
346 | |
347 | /* Data needed by the "quick" functions. */ | |
348 | struct dwarf2_per_cu_quick_data *quick; | |
349 | } v; | |
350 | ||
96c738c0 TT |
351 | /* The CUs we import using DW_TAG_imported_unit. This is filled in |
352 | while reading psymtabs, used to compute the psymtab dependencies, | |
353 | and then cleared. Then it is filled in again while reading full | |
354 | symbols, and only deleted when the objfile is destroyed. | |
355 | ||
356 | This is also used to work around a difference between the way gold | |
357 | generates .gdb_index version <=7 and the way gdb does. Arguably this | |
358 | is a gold bug. For symbols coming from TUs, gold records in the index | |
359 | the CU that includes the TU instead of the TU itself. This breaks | |
360 | dw2_lookup_symbol: It assumes that if the index says symbol X lives | |
361 | in CU/TU Y, then one need only expand Y and a subsequent lookup in Y | |
362 | will find X. Alas TUs live in their own symtab, so after expanding CU Y | |
363 | we need to look in TU Z to find X. Fortunately, this is akin to | |
364 | DW_TAG_imported_unit, so we just use the same mechanism: For | |
365 | .gdb_index version <=7 this also records the TUs that the CU referred | |
366 | to. Concurrently with this change gdb was modified to emit version 8 | |
367 | indices so we only pay a price for gold generated indices. | |
368 | http://sourceware.org/bugzilla/show_bug.cgi?id=15021. | |
369 | ||
370 | This currently needs to be a public member due to how | |
371 | dwarf2_per_cu_data is allocated and used. Ideally in future things | |
372 | could be refactored to make this private. Until then please try to | |
373 | avoid direct access to this member, and instead use the helper | |
374 | functions above. */ | |
375 | std::vector <dwarf2_per_cu_data *> *imported_symtabs; | |
376 | ||
ae640021 AB |
377 | /* Return true of IMPORTED_SYMTABS is empty or not yet allocated. */ |
378 | bool imported_symtabs_empty () const | |
379 | { | |
380 | return (imported_symtabs == nullptr || imported_symtabs->empty ()); | |
381 | } | |
382 | ||
383 | /* Push P to the back of IMPORTED_SYMTABS, allocated IMPORTED_SYMTABS | |
384 | first if required. */ | |
385 | void imported_symtabs_push (dwarf2_per_cu_data *p) | |
386 | { | |
387 | if (imported_symtabs == nullptr) | |
388 | imported_symtabs = new std::vector <dwarf2_per_cu_data *>; | |
389 | imported_symtabs->push_back (p); | |
390 | } | |
391 | ||
392 | /* Return the size of IMPORTED_SYMTABS if it is allocated, otherwise | |
393 | return 0. */ | |
394 | size_t imported_symtabs_size () const | |
395 | { | |
396 | if (imported_symtabs == nullptr) | |
397 | return 0; | |
398 | return imported_symtabs->size (); | |
399 | } | |
400 | ||
401 | /* Delete IMPORTED_SYMTABS and set the pointer back to nullptr. */ | |
402 | void imported_symtabs_free () | |
403 | { | |
404 | delete imported_symtabs; | |
405 | imported_symtabs = nullptr; | |
406 | } | |
09ba997f TT |
407 | |
408 | /* Return the OBJFILE associated with this compilation unit. If | |
409 | this compilation unit came from a separate debuginfo file, then | |
410 | the master objfile is returned. */ | |
411 | struct objfile *objfile () const; | |
412 | ||
413 | /* Return the address size given in the compilation unit header for | |
414 | this CU. */ | |
415 | int addr_size () const; | |
416 | ||
417 | /* Return the offset size given in the compilation unit header for | |
418 | this CU. */ | |
419 | int offset_size () const; | |
420 | ||
421 | /* Return the DW_FORM_ref_addr size given in the compilation unit | |
422 | header for this CU. */ | |
423 | int ref_addr_size () const; | |
424 | ||
425 | /* Return the text offset of the CU. The returned offset comes from | |
426 | this CU's objfile. If this objfile came from a separate | |
427 | debuginfo file, then the offset may be different from the | |
428 | corresponding offset in the parent objfile. */ | |
429 | CORE_ADDR text_offset () const; | |
430 | ||
431 | /* Return a type that is a generic pointer type, the size of which | |
432 | matches the address size given in the compilation unit header for | |
433 | this CU. */ | |
434 | struct type *addr_type () const; | |
435 | ||
436 | /* Find an integer type SIZE_IN_BYTES bytes in size and return it. | |
437 | UNSIGNED_P controls if the integer is unsigned or not. */ | |
438 | struct type *int_type (int size_in_bytes, bool unsigned_p) const; | |
439 | ||
440 | /* Find an integer type the same size as the address size given in | |
441 | the compilation unit header for this CU. UNSIGNED_P controls if | |
442 | the integer is unsigned or not. */ | |
443 | struct type *addr_sized_int_type (bool unsigned_p) const; | |
444 | ||
445 | /* Return DWARF version number of this CU. */ | |
446 | short version () const | |
447 | { | |
448 | return dwarf_version; | |
449 | } | |
197400e8 TT |
450 | |
451 | /* A type unit group has a per_cu object that is recognized by | |
452 | having no section. */ | |
453 | bool type_unit_group_p () const | |
454 | { | |
455 | return section == nullptr; | |
456 | } | |
cd4fb1b2 SM |
457 | }; |
458 | ||
459 | /* Entry in the signatured_types hash table. */ | |
460 | ||
461 | struct signatured_type | |
462 | { | |
463 | /* The "per_cu" object of this type. | |
464 | This struct is used iff per_cu.is_debug_types. | |
465 | N.B.: This is the first member so that it's easy to convert pointers | |
466 | between them. */ | |
467 | struct dwarf2_per_cu_data per_cu; | |
468 | ||
469 | /* The type's signature. */ | |
470 | ULONGEST signature; | |
471 | ||
472 | /* Offset in the TU of the type's DIE, as read from the TU header. | |
473 | If this TU is a DWO stub and the definition lives in a DWO file | |
474 | (specified by DW_AT_GNU_dwo_name), this value is unusable. */ | |
475 | cu_offset type_offset_in_tu; | |
476 | ||
477 | /* Offset in the section of the type's DIE. | |
478 | If the definition lives in a DWO file, this is the offset in the | |
479 | .debug_types.dwo section. | |
480 | The value is zero until the actual value is known. | |
481 | Zero is otherwise not a valid section offset. */ | |
482 | sect_offset type_offset_in_section; | |
483 | ||
484 | /* Type units are grouped by their DW_AT_stmt_list entry so that they | |
485 | can share them. This points to the containing symtab. */ | |
486 | struct type_unit_group *type_unit_group; | |
487 | ||
488 | /* The type. | |
489 | The first time we encounter this type we fully read it in and install it | |
490 | in the symbol tables. Subsequent times we only need the type. */ | |
491 | struct type *type; | |
492 | ||
493 | /* Containing DWO unit. | |
494 | This field is valid iff per_cu.reading_dwo_directly. */ | |
495 | struct dwo_unit *dwo_unit; | |
496 | }; | |
497 | ||
c4973306 SM |
498 | /* Open the separate '.dwz' debug file, if needed. Return NULL if |
499 | there is no .gnu_debugaltlink section in the file. Error if there | |
500 | is such a section but the file cannot be found. */ | |
501 | ||
502 | extern struct dwz_file *dwarf2_get_dwz_file | |
503 | (struct dwarf2_per_objfile *dwarf2_per_objfile); | |
504 | ||
8cb5117c SM |
505 | /* Return the type of the DIE at DIE_OFFSET in the CU named by |
506 | PER_CU. */ | |
507 | ||
508 | struct type *dwarf2_get_die_type (cu_offset die_offset, | |
509 | struct dwarf2_per_cu_data *per_cu); | |
510 | ||
450a1bfc SM |
511 | /* Given an index in .debug_addr, fetch the value. |
512 | NOTE: This can be called during dwarf expression evaluation, | |
513 | long after the debug information has been read, and thus per_cu->cu | |
514 | may no longer exist. */ | |
515 | ||
516 | CORE_ADDR dwarf2_read_addr_index (dwarf2_per_cu_data *per_cu, | |
517 | unsigned int addr_index); | |
518 | ||
d4c9a4f8 SM |
519 | /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU. |
520 | Returned value is intended for DW_OP_call*. Returned | |
521 | dwarf2_locexpr_baton->data has lifetime of | |
522 | PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */ | |
523 | ||
524 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_sect_off | |
525 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, | |
526 | CORE_ADDR (*get_frame_pc) (void *baton), | |
527 | void *baton, bool resolve_abstract_p = false); | |
528 | ||
529 | /* Like dwarf2_fetch_die_loc_sect_off, but take a CU | |
530 | offset. */ | |
531 | ||
532 | struct dwarf2_locexpr_baton dwarf2_fetch_die_loc_cu_off | |
533 | (cu_offset offset_in_cu, dwarf2_per_cu_data *per_cu, | |
534 | CORE_ADDR (*get_frame_pc) (void *baton), | |
535 | void *baton); | |
536 | ||
537 | /* If the DIE at SECT_OFF in PER_CU has a DW_AT_const_value, return a | |
538 | pointer to the constant bytes and set LEN to the length of the | |
539 | data. If memory is needed, allocate it on OBSTACK. If the DIE | |
540 | does not have a DW_AT_const_value, return NULL. */ | |
541 | ||
542 | extern const gdb_byte *dwarf2_fetch_constant_bytes | |
543 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu, obstack *obstack, | |
544 | LONGEST *len); | |
545 | ||
546 | /* Return the type of the die at SECT_OFF in PER_CU. Return NULL if no | |
547 | valid type for this die is found. */ | |
548 | ||
549 | struct type *dwarf2_fetch_die_type_sect_off | |
550 | (sect_offset sect_off, dwarf2_per_cu_data *per_cu); | |
551 | ||
8fdd972c TT |
552 | /* When non-zero, dump line number entries as they are read in. */ |
553 | extern unsigned int dwarf_line_debug; | |
554 | ||
cd4fb1b2 | 555 | #endif /* DWARF2READ_H */ |