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ccefe4c4 TT |
1 | /* Private partial symbol table definitions. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
ccefe4c4 TT |
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 PSYMPRIV_H | |
21 | #define PSYMPRIV_H | |
22 | ||
23 | #include "psymtab.h" | |
906768f9 | 24 | #include "objfiles.h" |
31edb802 | 25 | #include "gdbsupport/gdb_string_view.h" |
ccefe4c4 TT |
26 | |
27 | /* A partial_symbol records the name, domain, and address class of | |
28 | symbols whose types we have not parsed yet. For functions, it also | |
29 | contains their memory address, so we can find them from a PC value. | |
30 | Each partial_symbol sits in a partial_symtab, all of which are chained | |
95cf5869 | 31 | on a partial symtab list and which points to the corresponding |
ccefe4c4 TT |
32 | normal symtab once the partial_symtab has been referenced. */ |
33 | ||
34 | /* This structure is space critical. See space comments at the top of | |
0df8b418 | 35 | symtab.h. */ |
ccefe4c4 | 36 | |
af97b416 | 37 | struct partial_symbol |
ccefe4c4 | 38 | { |
8a6d4234 TT |
39 | /* Return the section for this partial symbol, or nullptr if no |
40 | section has been set. */ | |
41 | struct obj_section *obj_section (struct objfile *objfile) const | |
42 | { | |
af97b416 TT |
43 | if (ginfo.section >= 0) |
44 | return &objfile->sections[ginfo.section]; | |
8a6d4234 TT |
45 | return nullptr; |
46 | } | |
ccefe4c4 | 47 | |
02e9e7f7 TT |
48 | /* Return the unrelocated address of this partial symbol. */ |
49 | CORE_ADDR unrelocated_address () const | |
50 | { | |
af97b416 | 51 | return ginfo.value.address; |
02e9e7f7 TT |
52 | } |
53 | ||
54 | /* Return the address of this partial symbol, relocated according to | |
55 | the offsets provided in OBJFILE. */ | |
56 | CORE_ADDR address (const struct objfile *objfile) const | |
57 | { | |
6a053cb1 | 58 | return ginfo.value.address + objfile->section_offsets[ginfo.section]; |
02e9e7f7 TT |
59 | } |
60 | ||
61 | /* Set the address of this partial symbol. The address must be | |
62 | unrelocated. */ | |
79748972 | 63 | void set_unrelocated_address (CORE_ADDR addr) |
02e9e7f7 | 64 | { |
af97b416 | 65 | ginfo.value.address = addr; |
02e9e7f7 TT |
66 | } |
67 | ||
af97b416 TT |
68 | /* Note that partial_symbol does not derive from general_symbol_info |
69 | due to the bcache. See add_psymbol_to_bcache. */ | |
70 | ||
71 | struct general_symbol_info ginfo; | |
72 | ||
ccefe4c4 TT |
73 | /* Name space code. */ |
74 | ||
51cdc993 | 75 | ENUM_BITFIELD(domain_enum_tag) domain : SYMBOL_DOMAIN_BITS; |
ccefe4c4 | 76 | |
f1e6e072 TT |
77 | /* Address class (for info_symbols). Note that we don't allow |
78 | synthetic "aclass" values here at present, simply because there's | |
79 | no need. */ | |
ccefe4c4 | 80 | |
51cdc993 | 81 | ENUM_BITFIELD(address_class) aclass : SYMBOL_ACLASS_BITS; |
ccefe4c4 TT |
82 | }; |
83 | ||
9439a077 TT |
84 | /* A convenience enum to give names to some constants used when |
85 | searching psymtabs. This is internal to psymtab and should not be | |
86 | used elsewhere. */ | |
87 | ||
88 | enum psymtab_search_status | |
89 | { | |
90 | PST_NOT_SEARCHED, | |
91 | PST_SEARCHED_AND_FOUND, | |
92 | PST_SEARCHED_AND_NOT_FOUND | |
93 | }; | |
94 | ||
ccefe4c4 TT |
95 | /* Each source file that has not been fully read in is represented by |
96 | a partial_symtab. This contains the information on where in the | |
97 | executable the debugging symbols for a specific file are, and a | |
98 | list of names of global symbols which are located in this file. | |
99 | They are all chained on partial symtab lists. | |
100 | ||
101 | Even after the source file has been read into a symtab, the | |
102 | partial_symtab remains around. They are allocated on an obstack, | |
103 | objfile_obstack. */ | |
104 | ||
105 | struct partial_symtab | |
106 | { | |
32caafd0 TT |
107 | /* Allocate a new partial symbol table associated with OBJFILE. |
108 | FILENAME (which must be non-NULL) is the filename of this partial | |
109 | symbol table; it is copied into the appropriate storage. The | |
110 | partial symtab will also be installed using | |
111 | psymtab_storage::install. */ | |
112 | ||
113 | partial_symtab (const char *filename, struct objfile *objfile) | |
114 | ATTRIBUTE_NONNULL (2) ATTRIBUTE_NONNULL (3); | |
6f17252b | 115 | |
c3693a1d TT |
116 | /* Like the above, but also sets the initial text low and text high |
117 | from the ADDR argument, and sets the global- and | |
118 | static-offsets. */ | |
119 | ||
120 | partial_symtab (const char *filename, struct objfile *objfile, | |
121 | CORE_ADDR addr) | |
122 | ATTRIBUTE_NONNULL (2) ATTRIBUTE_NONNULL (3); | |
123 | ||
891813be TT |
124 | virtual ~partial_symtab () |
125 | { | |
126 | } | |
127 | ||
128 | /* Read the full symbol table corresponding to this partial symbol | |
129 | table. */ | |
130 | virtual void read_symtab (struct objfile *) = 0; | |
131 | ||
8566b89b TT |
132 | /* Psymtab expansion is done in two steps. The first step is a call |
133 | to read_symtab; but while that is in progress, calls to | |
134 | expand_psymtab can be made. */ | |
135 | virtual void expand_psymtab (struct objfile *) = 0; | |
136 | ||
0494dbec TT |
137 | /* Ensure that all the dependencies are read in. */ |
138 | void read_dependencies (struct objfile *); | |
139 | ||
79748972 TT |
140 | /* Return the raw low text address of this partial_symtab. */ |
141 | CORE_ADDR raw_text_low () const | |
4ae976d1 TT |
142 | { |
143 | return m_text_low; | |
144 | } | |
145 | ||
79748972 TT |
146 | /* Return the raw high text address of this partial_symtab. */ |
147 | CORE_ADDR raw_text_high () const | |
4ae976d1 TT |
148 | { |
149 | return m_text_high; | |
150 | } | |
151 | ||
79748972 TT |
152 | /* Return the relocated low text address of this partial_symtab. */ |
153 | CORE_ADDR text_low (struct objfile *objfile) const | |
154 | { | |
b3b3bada | 155 | return m_text_low + objfile->text_section_offset (); |
79748972 TT |
156 | } |
157 | ||
158 | /* Return the relocated high text address of this partial_symtab. */ | |
159 | CORE_ADDR text_high (struct objfile *objfile) const | |
160 | { | |
b3b3bada | 161 | return m_text_high + objfile->text_section_offset (); |
79748972 TT |
162 | } |
163 | ||
4ae976d1 TT |
164 | /* Set the low text address of this partial_symtab. */ |
165 | void set_text_low (CORE_ADDR addr) | |
166 | { | |
167 | m_text_low = addr; | |
52948f01 | 168 | text_low_valid = 1; |
4ae976d1 TT |
169 | } |
170 | ||
171 | /* Set the hight text address of this partial_symtab. */ | |
172 | void set_text_high (CORE_ADDR addr) | |
173 | { | |
174 | m_text_high = addr; | |
52948f01 | 175 | text_high_valid = 1; |
4ae976d1 TT |
176 | } |
177 | ||
178 | ||
ccefe4c4 TT |
179 | /* Chain of all existing partial symtabs. */ |
180 | ||
6f17252b | 181 | struct partial_symtab *next = nullptr; |
ccefe4c4 | 182 | |
b4c41fc7 DE |
183 | /* Name of the source file which this partial_symtab defines, |
184 | or if the psymtab is anonymous then a descriptive name for | |
185 | debugging purposes, or "". It must not be NULL. */ | |
ccefe4c4 | 186 | |
6f17252b | 187 | const char *filename = nullptr; |
ccefe4c4 TT |
188 | |
189 | /* Full path of the source file. NULL if not known. */ | |
190 | ||
6f17252b | 191 | char *fullname = nullptr; |
ccefe4c4 TT |
192 | |
193 | /* Directory in which it was compiled, or NULL if we don't know. */ | |
194 | ||
6f17252b | 195 | const char *dirname = nullptr; |
ccefe4c4 | 196 | |
ccefe4c4 | 197 | /* Range of text addresses covered by this file; texthigh is the |
9750bca9 | 198 | beginning of the next section. Do not use if PSYMTABS_ADDRMAP_SUPPORTED |
4ae976d1 | 199 | is set. Do not refer directly to these fields. Instead, use the |
52948f01 TT |
200 | accessors. The validity of these fields is determined by the |
201 | text_low_valid and text_high_valid fields; these are located later | |
202 | in this structure for better packing. */ | |
ccefe4c4 | 203 | |
6f17252b TT |
204 | CORE_ADDR m_text_low = 0; |
205 | CORE_ADDR m_text_high = 0; | |
ccefe4c4 | 206 | |
9439a077 TT |
207 | /* If NULL, this is an ordinary partial symbol table. |
208 | ||
209 | If non-NULL, this holds a single includer of this partial symbol | |
210 | table, and this partial symbol table is a shared one. | |
211 | ||
212 | A shared psymtab is one that is referenced by multiple other | |
213 | psymtabs, and which conceptually has its contents directly | |
214 | included in those. | |
215 | ||
216 | Shared psymtabs have special semantics. When a search finds a | |
217 | symbol in a shared table, we instead return one of the non-shared | |
218 | tables that include this one. | |
219 | ||
220 | A shared psymtabs can be referred to by other shared ones. | |
221 | ||
222 | The psymtabs that refer to a shared psymtab will list the shared | |
223 | psymtab in their 'dependencies' array. | |
224 | ||
225 | In DWARF terms, a shared psymtab is a DW_TAG_partial_unit; but | |
226 | of course using a name based on that would be too confusing, so | |
227 | "shared" was chosen instead. | |
95cf5869 | 228 | |
9439a077 TT |
229 | Only a single user is needed because, when expanding a shared |
230 | psymtab, we only need to expand its "canonical" non-shared user. | |
231 | The choice of which one should be canonical is left to the | |
232 | debuginfo reader; it can be arbitrary. */ | |
233 | ||
6f17252b | 234 | struct partial_symtab *user = nullptr; |
9439a077 | 235 | |
e1b06ae2 TT |
236 | /* Array of pointers to all of the partial_symtab's which this one |
237 | depends on. Since this array can only be set to previous or | |
238 | the current (?) psymtab, this dependency tree is guaranteed not | |
239 | to have any loops. "depends on" means that symbols must be read | |
240 | for the dependencies before being read for this psymtab; this is | |
241 | for type references in stabs, where if foo.c includes foo.h, declarations | |
242 | in foo.h may use type numbers defined in foo.c. For other debugging | |
243 | formats there may be no need to use dependencies. */ | |
244 | ||
6f17252b | 245 | struct partial_symtab **dependencies = nullptr; |
e1b06ae2 | 246 | |
6f17252b | 247 | int number_of_dependencies = 0; |
e1b06ae2 | 248 | |
ccefe4c4 TT |
249 | /* Global symbol list. This list will be sorted after readin to |
250 | improve access. Binary search will be the usual method of | |
0df8b418 | 251 | finding a symbol within it. globals_offset is an integer offset |
ccefe4c4 TT |
252 | within global_psymbols[]. */ |
253 | ||
6f17252b TT |
254 | int globals_offset = 0; |
255 | int n_global_syms = 0; | |
ccefe4c4 TT |
256 | |
257 | /* Static symbol list. This list will *not* be sorted after readin; | |
258 | to find a symbol in it, exhaustive search must be used. This is | |
259 | reasonable because searches through this list will eventually | |
260 | lead to either the read in of a files symbols for real (assumed | |
261 | to take a *lot* of time; check) or an error (and we don't care | |
262 | how long errors take). This is an offset and size within | |
263 | static_psymbols[]. */ | |
264 | ||
6f17252b TT |
265 | int statics_offset = 0; |
266 | int n_static_syms = 0; | |
ccefe4c4 | 267 | |
6d94535f TT |
268 | /* True if the symtab corresponding to this psymtab has been readin. |
269 | This is located here so that this structure packs better on | |
270 | 64-bit systems. */ | |
900c7f9d | 271 | |
6d94535f | 272 | bool readin = false; |
900c7f9d | 273 | |
9750bca9 JK |
274 | /* True iff objfile->psymtabs_addrmap is properly populated for this |
275 | partial_symtab. For discontiguous overlapping psymtabs is the only usable | |
276 | info in PSYMTABS_ADDRMAP. */ | |
277 | ||
6d94535f | 278 | bool psymtabs_addrmap_supported = false; |
9750bca9 | 279 | |
b4c41fc7 DE |
280 | /* True if the name of this partial symtab is not a source file name. */ |
281 | ||
6d94535f | 282 | bool anonymous = false; |
b4c41fc7 | 283 | |
9439a077 TT |
284 | /* A flag that is temporarily used when searching psymtabs. */ |
285 | ||
286 | ENUM_BITFIELD (psymtab_search_status) searched_flag : 2; | |
287 | ||
52948f01 TT |
288 | /* Validity of the m_text_low and m_text_high fields. */ |
289 | ||
290 | unsigned int text_low_valid : 1; | |
291 | unsigned int text_high_valid : 1; | |
292 | ||
43f3e411 | 293 | /* Pointer to compunit eventually allocated for this source file, 0 if |
ccefe4c4 TT |
294 | !readin or if we haven't looked for the symtab after it was readin. */ |
295 | ||
6f17252b | 296 | struct compunit_symtab *compunit_symtab = nullptr; |
891813be TT |
297 | }; |
298 | ||
299 | /* A partial_symtab that works in the historical db way. This should | |
300 | not be used in new code, but exists to transition the somewhat | |
301 | unmaintained "legacy" debug formats. */ | |
302 | ||
303 | struct legacy_psymtab : public partial_symtab | |
304 | { | |
305 | legacy_psymtab (const char *filename, struct objfile *objfile) | |
306 | : partial_symtab (filename, objfile) | |
307 | { | |
308 | } | |
309 | ||
310 | legacy_psymtab (const char *filename, struct objfile *objfile, | |
311 | CORE_ADDR addr) | |
312 | : partial_symtab (filename, objfile, addr) | |
313 | { | |
314 | } | |
315 | ||
316 | void read_symtab (struct objfile *objf) override | |
317 | { | |
318 | if (legacy_read_symtab) | |
319 | (*legacy_read_symtab) (this, objf); | |
320 | } | |
ccefe4c4 | 321 | |
8566b89b TT |
322 | void expand_psymtab (struct objfile *objf) override |
323 | { | |
324 | (*legacy_expand_psymtab) (this, objf); | |
325 | } | |
326 | ||
ccefe4c4 TT |
327 | /* Pointer to function which will read in the symtab corresponding to |
328 | this psymtab. */ | |
329 | ||
891813be | 330 | void (*legacy_read_symtab) (legacy_psymtab *, struct objfile *) = nullptr; |
ccefe4c4 | 331 | |
8566b89b TT |
332 | /* Pointer to function which will actually expand this psymtab into |
333 | a full symtab. */ | |
334 | ||
335 | void (*legacy_expand_psymtab) (legacy_psymtab *, struct objfile *) = nullptr; | |
336 | ||
ccefe4c4 TT |
337 | /* Information that lets read_symtab() locate the part of the symbol table |
338 | that this psymtab corresponds to. This information is private to the | |
339 | format-dependent symbol reading routines. For further detail examine | |
e38df1d0 | 340 | the various symbol reading modules. */ |
ccefe4c4 | 341 | |
6f17252b | 342 | void *read_symtab_private = nullptr; |
ccefe4c4 TT |
343 | }; |
344 | ||
75aedd27 TT |
345 | /* Specify whether a partial psymbol should be allocated on the global |
346 | list or the static list. */ | |
347 | ||
348 | enum class psymbol_placement | |
349 | { | |
350 | STATIC, | |
351 | GLOBAL | |
352 | }; | |
353 | ||
703a86c2 SM |
354 | /* Add a symbol to the partial symbol table of OBJFILE. |
355 | ||
356 | If COPY_NAME is true, make a copy of NAME, otherwise use the passed | |
357 | reference. | |
358 | ||
359 | THECLASS is the type of symbol. | |
360 | ||
361 | SECTION is the index of the section of OBJFILE in which the symbol is found. | |
362 | ||
363 | WHERE determines whether the symbol goes in the list of static or global | |
364 | partial symbols of OBJFILE. | |
365 | ||
366 | COREADDR is the address of the symbol. For partial symbols that don't have | |
367 | an address, zero is passed. | |
368 | ||
369 | LANGUAGE is the language from which the symbol originates. This will | |
370 | influence, amongst other things, how the symbol name is demangled. */ | |
371 | ||
31edb802 | 372 | extern void add_psymbol_to_list (gdb::string_view name, |
703a86c2 SM |
373 | bool copy_name, domain_enum domain, |
374 | enum address_class theclass, | |
375 | short section, | |
376 | psymbol_placement where, | |
377 | CORE_ADDR coreaddr, | |
378 | enum language language, | |
379 | struct objfile *objfile); | |
923c6a3d | 380 | |
6eee24ce TT |
381 | /* Initialize storage for partial symbols. If partial symbol storage |
382 | has already been initialized, this does nothing. TOTAL_SYMBOLS is | |
383 | an estimate of how many symbols there will be. */ | |
384 | ||
385 | extern void init_psymbol_list (struct objfile *objfile, int total_symbols); | |
923c6a3d | 386 | |
8763cede DE |
387 | extern void end_psymtab_common (struct objfile *, struct partial_symtab *); |
388 | ||
d320c2b5 TT |
389 | static inline void |
390 | discard_psymtab (struct objfile *objfile, struct partial_symtab *pst) | |
391 | { | |
392 | objfile->partial_symtabs->discard_psymtab (pst); | |
393 | } | |
923c6a3d | 394 | |
906768f9 TT |
395 | /* Used when recording partial symbol tables. On destruction, |
396 | discards any partial symbol tables that have been built. However, | |
397 | the tables can be kept by calling the "keep" method. */ | |
398 | class psymtab_discarder | |
399 | { | |
400 | public: | |
401 | ||
402 | psymtab_discarder (struct objfile *objfile) | |
403 | : m_objfile (objfile), | |
d320c2b5 | 404 | m_psymtab (objfile->partial_symtabs->psymtabs) |
906768f9 TT |
405 | { |
406 | } | |
407 | ||
408 | ~psymtab_discarder () | |
409 | { | |
410 | if (m_objfile != NULL) | |
d320c2b5 | 411 | m_objfile->partial_symtabs->discard_psymtabs_to (m_psymtab); |
906768f9 TT |
412 | } |
413 | ||
414 | /* Keep any partial symbol tables that were built. */ | |
415 | void keep () | |
416 | { | |
417 | m_objfile = NULL; | |
418 | } | |
419 | ||
420 | private: | |
421 | ||
422 | /* The objfile. If NULL this serves as a sentinel to indicate that | |
423 | the psymtabs should be kept. */ | |
424 | struct objfile *m_objfile; | |
425 | /* How far back to free. */ | |
426 | struct partial_symtab *m_psymtab; | |
427 | }; | |
c9bf0622 | 428 | |
ccefe4c4 | 429 | #endif /* PSYMPRIV_H */ |