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de4f826b DC |
1 | /* Routines for name->symbol lookups in GDB. |
2 | ||
7b6bb8da JB |
3 | Copyright (C) 2003, 2007, 2008, 2009, 2010, 2011 |
4 | Free Software Foundation, Inc. | |
de4f826b DC |
5 | |
6 | Contributed by David Carlton <carlton@bactrian.org> and by Kealia, | |
7 | Inc. | |
8 | ||
9 | This file is part of GDB. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
a9762ec7 JB |
13 | the Free Software Foundation; either version 3 of the License, or |
14 | (at your option) any later version. | |
de4f826b | 15 | |
a9762ec7 JB |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
de4f826b DC |
20 | |
21 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
de4f826b DC |
23 | |
24 | #include "defs.h" | |
c4d840bd | 25 | #include <ctype.h> |
de4f826b DC |
26 | #include "gdb_obstack.h" |
27 | #include "symtab.h" | |
28 | #include "buildsym.h" | |
29 | #include "gdb_assert.h" | |
30 | #include "dictionary.h" | |
31 | ||
32 | /* This file implements dictionaries, which are tables that associate | |
33 | symbols to names. They are represented by an opaque type 'struct | |
34 | dictionary'. That type has various internal implementations, which | |
35 | you can choose between depending on what properties you need | |
36 | (e.g. fast lookup, order-preserving, expandable). | |
37 | ||
38 | Each dictionary starts with a 'virtual function table' that | |
39 | contains the functions that actually implement the various | |
40 | operations that dictionaries provide. (Note, however, that, for | |
41 | the sake of client code, we also provide some functions that can be | |
42 | implemented generically in terms of the functions in the vtable.) | |
43 | ||
44 | To add a new dictionary implementation <impl>, what you should do | |
45 | is: | |
46 | ||
47 | * Add a new element DICT_<IMPL> to dict_type. | |
48 | ||
49 | * Create a new structure dictionary_<impl>. If your new | |
50 | implementation is a variant of an existing one, make sure that | |
51 | their structs have the same initial data members. Define accessor | |
52 | macros for your new data members. | |
53 | ||
54 | * Implement all the functions in dict_vector as static functions, | |
55 | whose name is the same as the corresponding member of dict_vector | |
56 | plus _<impl>. You don't have to do this for those members where | |
57 | you can reuse existing generic functions | |
58 | (e.g. add_symbol_nonexpandable, free_obstack) or in the case where | |
59 | your new implementation is a variant of an existing implementation | |
60 | and where the variant doesn't affect the member function in | |
61 | question. | |
62 | ||
63 | * Define a static const struct dict_vector dict_<impl>_vector. | |
64 | ||
65 | * Define a function dict_create_<impl> to create these | |
66 | gizmos. Add its declaration to dictionary.h. | |
67 | ||
68 | To add a new operation <op> on all existing implementations, what | |
69 | you should do is: | |
70 | ||
71 | * Add a new member <op> to struct dict_vector. | |
72 | ||
73 | * If there is useful generic behavior <op>, define a static | |
74 | function <op>_something_informative that implements that behavior. | |
75 | (E.g. add_symbol_nonexpandable, free_obstack.) | |
76 | ||
77 | * For every implementation <impl> that should have its own specific | |
78 | behavior for <op>, define a static function <op>_<impl> | |
79 | implementing it. | |
80 | ||
81 | * Modify all existing dict_vector_<impl>'s to include the appropriate | |
82 | member. | |
83 | ||
84 | * Define a function dict_<op> that looks up <op> in the dict_vector | |
85 | and calls the appropriate function. Add a declaration for | |
86 | dict_<op> to dictionary.h. | |
87 | ||
88 | */ | |
89 | ||
90 | /* An enum representing the various implementations of dictionaries. | |
91 | Used only for debugging. */ | |
92 | ||
93 | enum dict_type | |
94 | { | |
95 | /* Symbols are stored in a fixed-size hash table. */ | |
96 | DICT_HASHED, | |
97 | /* Symbols are stored in an expandable hash table. */ | |
98 | DICT_HASHED_EXPANDABLE, | |
99 | /* Symbols are stored in a fixed-size array. */ | |
100 | DICT_LINEAR, | |
101 | /* Symbols are stored in an expandable array. */ | |
20605361 | 102 | DICT_LINEAR_EXPANDABLE |
de4f826b DC |
103 | }; |
104 | ||
105 | /* The virtual function table. */ | |
106 | ||
107 | struct dict_vector | |
108 | { | |
109 | /* The type of the dictionary. This is only here to make debugging | |
110 | a bit easier; it's not actually used. */ | |
111 | enum dict_type type; | |
112 | /* The function to free a dictionary. */ | |
113 | void (*free) (struct dictionary *dict); | |
114 | /* Add a symbol to a dictionary, if possible. */ | |
115 | void (*add_symbol) (struct dictionary *dict, struct symbol *sym); | |
116 | /* Iterator functions. */ | |
117 | struct symbol *(*iterator_first) (const struct dictionary *dict, | |
118 | struct dict_iterator *iterator); | |
119 | struct symbol *(*iterator_next) (struct dict_iterator *iterator); | |
120 | /* Functions to iterate over symbols with a given name. */ | |
c4d840bd | 121 | struct symbol *(*iter_match_first) (const struct dictionary *dict, |
2edb89d3 JK |
122 | const char *name, |
123 | symbol_compare_ftype *equiv, | |
124 | struct dict_iterator *iterator); | |
c4d840bd | 125 | struct symbol *(*iter_match_next) (const char *name, |
2edb89d3 | 126 | symbol_compare_ftype *equiv, |
de4f826b | 127 | struct dict_iterator *iterator); |
de4f826b DC |
128 | /* A size function, for maint print symtabs. */ |
129 | int (*size) (const struct dictionary *dict); | |
130 | }; | |
131 | ||
132 | /* Now comes the structs used to store the data for different | |
133 | implementations. If two implementations have data in common, put | |
134 | the common data at the top of their structs, ordered in the same | |
135 | way. */ | |
136 | ||
137 | struct dictionary_hashed | |
138 | { | |
139 | int nbuckets; | |
140 | struct symbol **buckets; | |
141 | }; | |
142 | ||
143 | struct dictionary_hashed_expandable | |
144 | { | |
145 | /* How many buckets we currently have. */ | |
146 | int nbuckets; | |
147 | struct symbol **buckets; | |
148 | /* How many syms we currently have; we need this so we will know | |
149 | when to add more buckets. */ | |
150 | int nsyms; | |
151 | }; | |
152 | ||
153 | struct dictionary_linear | |
154 | { | |
155 | int nsyms; | |
156 | struct symbol **syms; | |
157 | }; | |
158 | ||
159 | struct dictionary_linear_expandable | |
160 | { | |
161 | /* How many symbols we currently have. */ | |
162 | int nsyms; | |
163 | struct symbol **syms; | |
164 | /* How many symbols we can store before needing to reallocate. */ | |
165 | int capacity; | |
166 | }; | |
167 | ||
168 | /* And now, the star of our show. */ | |
169 | ||
170 | struct dictionary | |
171 | { | |
172 | const struct dict_vector *vector; | |
173 | union | |
174 | { | |
175 | struct dictionary_hashed hashed; | |
176 | struct dictionary_hashed_expandable hashed_expandable; | |
177 | struct dictionary_linear linear; | |
178 | struct dictionary_linear_expandable linear_expandable; | |
179 | } | |
180 | data; | |
181 | }; | |
182 | ||
183 | /* Accessor macros. */ | |
184 | ||
185 | #define DICT_VECTOR(d) (d)->vector | |
186 | ||
187 | /* These can be used for DICT_HASHED_EXPANDABLE, too. */ | |
188 | ||
189 | #define DICT_HASHED_NBUCKETS(d) (d)->data.hashed.nbuckets | |
190 | #define DICT_HASHED_BUCKETS(d) (d)->data.hashed.buckets | |
191 | #define DICT_HASHED_BUCKET(d,i) DICT_HASHED_BUCKETS (d) [i] | |
192 | ||
193 | #define DICT_HASHED_EXPANDABLE_NSYMS(d) (d)->data.hashed_expandable.nsyms | |
194 | ||
195 | /* These can be used for DICT_LINEAR_EXPANDABLEs, too. */ | |
196 | ||
197 | #define DICT_LINEAR_NSYMS(d) (d)->data.linear.nsyms | |
198 | #define DICT_LINEAR_SYMS(d) (d)->data.linear.syms | |
199 | #define DICT_LINEAR_SYM(d,i) DICT_LINEAR_SYMS (d) [i] | |
200 | ||
201 | #define DICT_LINEAR_EXPANDABLE_CAPACITY(d) \ | |
202 | (d)->data.linear_expandable.capacity | |
203 | ||
204 | /* The initial size of a DICT_*_EXPANDABLE dictionary. */ | |
205 | ||
206 | #define DICT_EXPANDABLE_INITIAL_CAPACITY 10 | |
207 | ||
208 | /* This calculates the number of buckets we'll use in a hashtable, | |
209 | given the number of symbols that it will contain. */ | |
210 | ||
211 | #define DICT_HASHTABLE_SIZE(n) ((n)/5 + 1) | |
212 | ||
213 | /* Accessor macros for dict_iterators; they're here rather than | |
214 | dictionary.h because code elsewhere should treat dict_iterators as | |
215 | opaque. */ | |
216 | ||
217 | /* The dictionary that the iterator is associated to. */ | |
218 | #define DICT_ITERATOR_DICT(iter) (iter)->dict | |
219 | /* For linear dictionaries, the index of the last symbol returned; for | |
220 | hashed dictionaries, the bucket of the last symbol returned. */ | |
221 | #define DICT_ITERATOR_INDEX(iter) (iter)->index | |
222 | /* For hashed dictionaries, this points to the last symbol returned; | |
223 | otherwise, this is unused. */ | |
224 | #define DICT_ITERATOR_CURRENT(iter) (iter)->current | |
225 | ||
226 | /* Declarations of functions for vectors. */ | |
227 | ||
228 | /* Functions that might work across a range of dictionary types. */ | |
229 | ||
230 | static void add_symbol_nonexpandable (struct dictionary *dict, | |
231 | struct symbol *sym); | |
232 | ||
233 | static void free_obstack (struct dictionary *dict); | |
234 | ||
235 | /* Functions for DICT_HASHED and DICT_HASHED_EXPANDABLE | |
236 | dictionaries. */ | |
237 | ||
238 | static struct symbol *iterator_first_hashed (const struct dictionary *dict, | |
239 | struct dict_iterator *iterator); | |
240 | ||
241 | static struct symbol *iterator_next_hashed (struct dict_iterator *iterator); | |
242 | ||
c4d840bd PH |
243 | static struct symbol *iter_match_first_hashed (const struct dictionary *dict, |
244 | const char *name, | |
2edb89d3 | 245 | symbol_compare_ftype *compare, |
de4f826b DC |
246 | struct dict_iterator *iterator); |
247 | ||
c4d840bd | 248 | static struct symbol *iter_match_next_hashed (const char *name, |
2edb89d3 | 249 | symbol_compare_ftype *compare, |
c4d840bd PH |
250 | struct dict_iterator *iterator); |
251 | ||
252 | static unsigned int dict_hash (const char *string); | |
de4f826b DC |
253 | |
254 | /* Functions only for DICT_HASHED. */ | |
255 | ||
256 | static int size_hashed (const struct dictionary *dict); | |
257 | ||
258 | /* Functions only for DICT_HASHED_EXPANDABLE. */ | |
259 | ||
260 | static void free_hashed_expandable (struct dictionary *dict); | |
261 | ||
262 | static void add_symbol_hashed_expandable (struct dictionary *dict, | |
263 | struct symbol *sym); | |
264 | ||
265 | static int size_hashed_expandable (const struct dictionary *dict); | |
266 | ||
267 | /* Functions for DICT_LINEAR and DICT_LINEAR_EXPANDABLE | |
268 | dictionaries. */ | |
269 | ||
270 | static struct symbol *iterator_first_linear (const struct dictionary *dict, | |
271 | struct dict_iterator *iterator); | |
272 | ||
273 | static struct symbol *iterator_next_linear (struct dict_iterator *iterator); | |
274 | ||
c4d840bd PH |
275 | static struct symbol *iter_match_first_linear (const struct dictionary *dict, |
276 | const char *name, | |
2edb89d3 | 277 | symbol_compare_ftype *compare, |
c4d840bd | 278 | struct dict_iterator *iterator); |
de4f826b | 279 | |
c4d840bd | 280 | static struct symbol *iter_match_next_linear (const char *name, |
2edb89d3 | 281 | symbol_compare_ftype *compare, |
c4d840bd | 282 | struct dict_iterator *iterator); |
de4f826b DC |
283 | |
284 | static int size_linear (const struct dictionary *dict); | |
285 | ||
286 | /* Functions only for DICT_LINEAR_EXPANDABLE. */ | |
287 | ||
288 | static void free_linear_expandable (struct dictionary *dict); | |
289 | ||
290 | static void add_symbol_linear_expandable (struct dictionary *dict, | |
291 | struct symbol *sym); | |
292 | ||
293 | /* Various vectors that we'll actually use. */ | |
294 | ||
295 | static const struct dict_vector dict_hashed_vector = | |
296 | { | |
297 | DICT_HASHED, /* type */ | |
298 | free_obstack, /* free */ | |
299 | add_symbol_nonexpandable, /* add_symbol */ | |
a11a1416 | 300 | iterator_first_hashed, /* iterator_first */ |
de4f826b | 301 | iterator_next_hashed, /* iterator_next */ |
c4d840bd PH |
302 | iter_match_first_hashed, /* iter_name_first */ |
303 | iter_match_next_hashed, /* iter_name_next */ | |
de4f826b DC |
304 | size_hashed, /* size */ |
305 | }; | |
306 | ||
307 | static const struct dict_vector dict_hashed_expandable_vector = | |
308 | { | |
309 | DICT_HASHED_EXPANDABLE, /* type */ | |
310 | free_hashed_expandable, /* free */ | |
311 | add_symbol_hashed_expandable, /* add_symbol */ | |
a11a1416 | 312 | iterator_first_hashed, /* iterator_first */ |
de4f826b | 313 | iterator_next_hashed, /* iterator_next */ |
c4d840bd PH |
314 | iter_match_first_hashed, /* iter_name_first */ |
315 | iter_match_next_hashed, /* iter_name_next */ | |
de4f826b DC |
316 | size_hashed_expandable, /* size */ |
317 | }; | |
318 | ||
319 | static const struct dict_vector dict_linear_vector = | |
320 | { | |
321 | DICT_LINEAR, /* type */ | |
322 | free_obstack, /* free */ | |
323 | add_symbol_nonexpandable, /* add_symbol */ | |
a11a1416 | 324 | iterator_first_linear, /* iterator_first */ |
de4f826b | 325 | iterator_next_linear, /* iterator_next */ |
c4d840bd PH |
326 | iter_match_first_linear, /* iter_name_first */ |
327 | iter_match_next_linear, /* iter_name_next */ | |
de4f826b DC |
328 | size_linear, /* size */ |
329 | }; | |
330 | ||
331 | static const struct dict_vector dict_linear_expandable_vector = | |
332 | { | |
333 | DICT_LINEAR_EXPANDABLE, /* type */ | |
334 | free_linear_expandable, /* free */ | |
335 | add_symbol_linear_expandable, /* add_symbol */ | |
a11a1416 | 336 | iterator_first_linear, /* iterator_first */ |
de4f826b | 337 | iterator_next_linear, /* iterator_next */ |
c4d840bd PH |
338 | iter_match_first_linear, /* iter_name_first */ |
339 | iter_match_next_linear, /* iter_name_next */ | |
de4f826b DC |
340 | size_linear, /* size */ |
341 | }; | |
342 | ||
343 | /* Declarations of helper functions (i.e. ones that don't go into | |
344 | vectors). */ | |
345 | ||
346 | static struct symbol *iterator_hashed_advance (struct dict_iterator *iter); | |
347 | ||
348 | static void insert_symbol_hashed (struct dictionary *dict, | |
349 | struct symbol *sym); | |
350 | ||
351 | static void expand_hashtable (struct dictionary *dict); | |
352 | ||
353 | /* The creation functions. */ | |
354 | ||
355 | /* Create a dictionary implemented via a fixed-size hashtable. All | |
356 | memory it uses is allocated on OBSTACK; the environment is | |
357 | initialized from SYMBOL_LIST. */ | |
358 | ||
359 | struct dictionary * | |
360 | dict_create_hashed (struct obstack *obstack, | |
361 | const struct pending *symbol_list) | |
362 | { | |
363 | struct dictionary *retval; | |
364 | int nsyms = 0, nbuckets, i; | |
365 | struct symbol **buckets; | |
366 | const struct pending *list_counter; | |
367 | ||
368 | retval = obstack_alloc (obstack, sizeof (struct dictionary)); | |
369 | DICT_VECTOR (retval) = &dict_hashed_vector; | |
370 | ||
371 | /* Calculate the number of symbols, and allocate space for them. */ | |
372 | for (list_counter = symbol_list; | |
373 | list_counter != NULL; | |
374 | list_counter = list_counter->next) | |
375 | { | |
376 | nsyms += list_counter->nsyms; | |
377 | } | |
378 | nbuckets = DICT_HASHTABLE_SIZE (nsyms); | |
379 | DICT_HASHED_NBUCKETS (retval) = nbuckets; | |
380 | buckets = obstack_alloc (obstack, nbuckets * sizeof (struct symbol *)); | |
381 | memset (buckets, 0, nbuckets * sizeof (struct symbol *)); | |
382 | DICT_HASHED_BUCKETS (retval) = buckets; | |
383 | ||
384 | /* Now fill the buckets. */ | |
385 | for (list_counter = symbol_list; | |
386 | list_counter != NULL; | |
387 | list_counter = list_counter->next) | |
388 | { | |
389 | for (i = list_counter->nsyms - 1; i >= 0; --i) | |
390 | { | |
391 | insert_symbol_hashed (retval, list_counter->symbol[i]); | |
392 | } | |
393 | } | |
394 | ||
395 | return retval; | |
396 | } | |
397 | ||
398 | /* Create a dictionary implemented via a hashtable that grows as | |
399 | necessary. The dictionary is initially empty; to add symbols to | |
400 | it, call dict_add_symbol(). Call dict_free() when you're done with | |
401 | it. */ | |
402 | ||
403 | extern struct dictionary * | |
404 | dict_create_hashed_expandable (void) | |
405 | { | |
406 | struct dictionary *retval; | |
407 | ||
408 | retval = xmalloc (sizeof (struct dictionary)); | |
409 | DICT_VECTOR (retval) = &dict_hashed_expandable_vector; | |
410 | DICT_HASHED_NBUCKETS (retval) = DICT_EXPANDABLE_INITIAL_CAPACITY; | |
411 | DICT_HASHED_BUCKETS (retval) = xcalloc (DICT_EXPANDABLE_INITIAL_CAPACITY, | |
412 | sizeof (struct symbol *)); | |
413 | DICT_HASHED_EXPANDABLE_NSYMS (retval) = 0; | |
414 | ||
415 | return retval; | |
416 | } | |
417 | ||
418 | /* Create a dictionary implemented via a fixed-size array. All memory | |
419 | it uses is allocated on OBSTACK; the environment is initialized | |
420 | from the SYMBOL_LIST. The symbols are ordered in the same order | |
421 | that they're found in SYMBOL_LIST. */ | |
422 | ||
423 | struct dictionary * | |
424 | dict_create_linear (struct obstack *obstack, | |
425 | const struct pending *symbol_list) | |
426 | { | |
427 | struct dictionary *retval; | |
428 | int nsyms = 0, i, j; | |
429 | struct symbol **syms; | |
430 | const struct pending *list_counter; | |
431 | ||
432 | retval = obstack_alloc (obstack, sizeof (struct dictionary)); | |
433 | DICT_VECTOR (retval) = &dict_linear_vector; | |
434 | ||
435 | /* Calculate the number of symbols, and allocate space for them. */ | |
436 | for (list_counter = symbol_list; | |
437 | list_counter != NULL; | |
438 | list_counter = list_counter->next) | |
439 | { | |
440 | nsyms += list_counter->nsyms; | |
441 | } | |
442 | DICT_LINEAR_NSYMS (retval) = nsyms; | |
443 | syms = obstack_alloc (obstack, nsyms * sizeof (struct symbol *)); | |
444 | DICT_LINEAR_SYMS (retval) = syms; | |
445 | ||
446 | /* Now fill in the symbols. Start filling in from the back, so as | |
447 | to preserve the original order of the symbols. */ | |
448 | for (list_counter = symbol_list, j = nsyms - 1; | |
449 | list_counter != NULL; | |
450 | list_counter = list_counter->next) | |
451 | { | |
452 | for (i = list_counter->nsyms - 1; | |
453 | i >= 0; | |
454 | --i, --j) | |
455 | { | |
456 | syms[j] = list_counter->symbol[i]; | |
457 | } | |
458 | } | |
459 | ||
460 | return retval; | |
461 | } | |
462 | ||
463 | /* Create a dictionary implemented via an array that grows as | |
464 | necessary. The dictionary is initially empty; to add symbols to | |
465 | it, call dict_add_symbol(). Call dict_free() when you're done with | |
466 | it. */ | |
467 | ||
468 | struct dictionary * | |
469 | dict_create_linear_expandable (void) | |
470 | { | |
471 | struct dictionary *retval; | |
472 | ||
473 | retval = xmalloc (sizeof (struct dictionary)); | |
474 | DICT_VECTOR (retval) = &dict_linear_expandable_vector; | |
475 | DICT_LINEAR_NSYMS (retval) = 0; | |
476 | DICT_LINEAR_EXPANDABLE_CAPACITY (retval) | |
477 | = DICT_EXPANDABLE_INITIAL_CAPACITY; | |
478 | DICT_LINEAR_SYMS (retval) | |
479 | = xmalloc (DICT_LINEAR_EXPANDABLE_CAPACITY (retval) | |
480 | * sizeof (struct symbol *)); | |
481 | ||
482 | return retval; | |
483 | } | |
484 | ||
485 | /* The functions providing the dictionary interface. */ | |
486 | ||
487 | /* Free the memory used by a dictionary that's not on an obstack. (If | |
488 | any.) */ | |
489 | ||
490 | void | |
491 | dict_free (struct dictionary *dict) | |
492 | { | |
493 | (DICT_VECTOR (dict))->free (dict); | |
494 | } | |
495 | ||
496 | /* Add SYM to DICT. DICT had better be expandable. */ | |
497 | ||
498 | void | |
499 | dict_add_symbol (struct dictionary *dict, struct symbol *sym) | |
500 | { | |
501 | (DICT_VECTOR (dict))->add_symbol (dict, sym); | |
502 | } | |
503 | ||
504 | /* Initialize ITERATOR to point at the first symbol in DICT, and | |
505 | return that first symbol, or NULL if DICT is empty. */ | |
506 | ||
507 | struct symbol * | |
508 | dict_iterator_first (const struct dictionary *dict, | |
509 | struct dict_iterator *iterator) | |
510 | { | |
511 | return (DICT_VECTOR (dict))->iterator_first (dict, iterator); | |
512 | } | |
513 | ||
514 | /* Advance ITERATOR, and return the next symbol, or NULL if there are | |
515 | no more symbols. */ | |
516 | ||
517 | struct symbol * | |
518 | dict_iterator_next (struct dict_iterator *iterator) | |
519 | { | |
520 | return (DICT_VECTOR (DICT_ITERATOR_DICT (iterator))) | |
521 | ->iterator_next (iterator); | |
522 | } | |
523 | ||
524 | struct symbol * | |
525 | dict_iter_name_first (const struct dictionary *dict, | |
526 | const char *name, | |
527 | struct dict_iterator *iterator) | |
528 | { | |
c4d840bd | 529 | return dict_iter_match_first (dict, name, strcmp_iw, iterator); |
de4f826b DC |
530 | } |
531 | ||
532 | struct symbol * | |
533 | dict_iter_name_next (const char *name, struct dict_iterator *iterator) | |
c4d840bd PH |
534 | { |
535 | return dict_iter_match_next (name, strcmp_iw, iterator); | |
536 | } | |
537 | ||
538 | struct symbol * | |
539 | dict_iter_match_first (const struct dictionary *dict, | |
2edb89d3 | 540 | const char *name, symbol_compare_ftype *compare, |
c4d840bd PH |
541 | struct dict_iterator *iterator) |
542 | { | |
3e43a32a MS |
543 | return (DICT_VECTOR (dict))->iter_match_first (dict, name, |
544 | compare, iterator); | |
c4d840bd PH |
545 | } |
546 | ||
547 | struct symbol * | |
2edb89d3 | 548 | dict_iter_match_next (const char *name, symbol_compare_ftype *compare, |
c4d840bd | 549 | struct dict_iterator *iterator) |
de4f826b DC |
550 | { |
551 | return (DICT_VECTOR (DICT_ITERATOR_DICT (iterator))) | |
c4d840bd | 552 | ->iter_match_next (name, compare, iterator); |
de4f826b DC |
553 | } |
554 | ||
555 | int | |
556 | dict_size (const struct dictionary *dict) | |
557 | { | |
558 | return (DICT_VECTOR (dict))->size (dict); | |
559 | } | |
560 | ||
561 | /* Now come functions (well, one function, currently) that are | |
562 | implemented generically by means of the vtable. Typically, they're | |
563 | rarely used. */ | |
564 | ||
565 | /* Test to see if DICT is empty. */ | |
566 | ||
567 | int | |
568 | dict_empty (struct dictionary *dict) | |
569 | { | |
570 | struct dict_iterator iter; | |
571 | ||
572 | return (dict_iterator_first (dict, &iter) == NULL); | |
573 | } | |
574 | ||
575 | ||
576 | /* The functions implementing the dictionary interface. */ | |
577 | ||
578 | /* Generic functions, where appropriate. */ | |
579 | ||
580 | static void | |
581 | free_obstack (struct dictionary *dict) | |
582 | { | |
583 | /* Do nothing! */ | |
584 | } | |
585 | ||
586 | static void | |
587 | add_symbol_nonexpandable (struct dictionary *dict, struct symbol *sym) | |
588 | { | |
589 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 590 | _("dict_add_symbol: non-expandable dictionary")); |
de4f826b DC |
591 | } |
592 | ||
593 | /* Functions for DICT_HASHED and DICT_HASHED_EXPANDABLE. */ | |
594 | ||
595 | static struct symbol * | |
596 | iterator_first_hashed (const struct dictionary *dict, | |
597 | struct dict_iterator *iterator) | |
598 | { | |
599 | DICT_ITERATOR_DICT (iterator) = dict; | |
600 | DICT_ITERATOR_INDEX (iterator) = -1; | |
601 | return iterator_hashed_advance (iterator); | |
602 | } | |
603 | ||
604 | static struct symbol * | |
605 | iterator_next_hashed (struct dict_iterator *iterator) | |
606 | { | |
de4f826b DC |
607 | struct symbol *next; |
608 | ||
609 | next = DICT_ITERATOR_CURRENT (iterator)->hash_next; | |
610 | ||
611 | if (next == NULL) | |
612 | return iterator_hashed_advance (iterator); | |
613 | else | |
614 | { | |
615 | DICT_ITERATOR_CURRENT (iterator) = next; | |
616 | return next; | |
617 | } | |
618 | } | |
619 | ||
620 | static struct symbol * | |
621 | iterator_hashed_advance (struct dict_iterator *iterator) | |
622 | { | |
623 | const struct dictionary *dict = DICT_ITERATOR_DICT (iterator); | |
624 | int nbuckets = DICT_HASHED_NBUCKETS (dict); | |
625 | int i; | |
626 | ||
627 | for (i = DICT_ITERATOR_INDEX (iterator) + 1; i < nbuckets; ++i) | |
628 | { | |
629 | struct symbol *sym = DICT_HASHED_BUCKET (dict, i); | |
630 | ||
631 | if (sym != NULL) | |
632 | { | |
633 | DICT_ITERATOR_INDEX (iterator) = i; | |
634 | DICT_ITERATOR_CURRENT (iterator) = sym; | |
635 | return sym; | |
636 | } | |
637 | } | |
638 | ||
639 | return NULL; | |
640 | } | |
641 | ||
642 | static struct symbol * | |
2edb89d3 JK |
643 | iter_match_first_hashed (const struct dictionary *dict, const char *name, |
644 | symbol_compare_ftype *compare, | |
c4d840bd | 645 | struct dict_iterator *iterator) |
de4f826b | 646 | { |
c4d840bd | 647 | unsigned int hash_index = dict_hash (name) % DICT_HASHED_NBUCKETS (dict); |
de4f826b DC |
648 | struct symbol *sym; |
649 | ||
650 | DICT_ITERATOR_DICT (iterator) = dict; | |
651 | ||
652 | /* Loop through the symbols in the given bucket, breaking when SYM | |
653 | first matches. If SYM never matches, it will be set to NULL; | |
654 | either way, we have the right return value. */ | |
655 | ||
656 | for (sym = DICT_HASHED_BUCKET (dict, hash_index); | |
657 | sym != NULL; | |
658 | sym = sym->hash_next) | |
659 | { | |
c4d840bd PH |
660 | /* Warning: the order of arguments to compare matters! */ |
661 | if (compare (SYMBOL_SEARCH_NAME (sym), name) == 0) | |
de4f826b DC |
662 | { |
663 | break; | |
664 | } | |
665 | ||
666 | } | |
667 | ||
668 | DICT_ITERATOR_CURRENT (iterator) = sym; | |
669 | return sym; | |
670 | } | |
671 | ||
672 | static struct symbol * | |
2edb89d3 | 673 | iter_match_next_hashed (const char *name, symbol_compare_ftype *compare, |
c4d840bd | 674 | struct dict_iterator *iterator) |
de4f826b DC |
675 | { |
676 | struct symbol *next; | |
677 | ||
678 | for (next = DICT_ITERATOR_CURRENT (iterator)->hash_next; | |
679 | next != NULL; | |
680 | next = next->hash_next) | |
681 | { | |
c4d840bd | 682 | if (compare (SYMBOL_SEARCH_NAME (next), name) == 0) |
de4f826b DC |
683 | break; |
684 | } | |
685 | ||
686 | DICT_ITERATOR_CURRENT (iterator) = next; | |
687 | ||
688 | return next; | |
689 | } | |
690 | ||
691 | /* Insert SYM into DICT. */ | |
692 | ||
693 | static void | |
694 | insert_symbol_hashed (struct dictionary *dict, | |
695 | struct symbol *sym) | |
696 | { | |
697 | unsigned int hash_index; | |
698 | struct symbol **buckets = DICT_HASHED_BUCKETS (dict); | |
699 | ||
c4d840bd PH |
700 | hash_index = |
701 | dict_hash (SYMBOL_SEARCH_NAME (sym)) % DICT_HASHED_NBUCKETS (dict); | |
de4f826b DC |
702 | sym->hash_next = buckets[hash_index]; |
703 | buckets[hash_index] = sym; | |
704 | } | |
705 | ||
706 | static int | |
707 | size_hashed (const struct dictionary *dict) | |
708 | { | |
709 | return DICT_HASHED_NBUCKETS (dict); | |
710 | } | |
711 | ||
712 | /* Functions only for DICT_HASHED_EXPANDABLE. */ | |
713 | ||
714 | static void | |
715 | free_hashed_expandable (struct dictionary *dict) | |
716 | { | |
717 | xfree (DICT_HASHED_BUCKETS (dict)); | |
718 | xfree (dict); | |
719 | } | |
720 | ||
721 | static void | |
722 | add_symbol_hashed_expandable (struct dictionary *dict, | |
723 | struct symbol *sym) | |
724 | { | |
725 | int nsyms = ++DICT_HASHED_EXPANDABLE_NSYMS (dict); | |
726 | ||
727 | if (DICT_HASHTABLE_SIZE (nsyms) > DICT_HASHED_NBUCKETS (dict)) | |
728 | expand_hashtable (dict); | |
729 | ||
730 | insert_symbol_hashed (dict, sym); | |
731 | DICT_HASHED_EXPANDABLE_NSYMS (dict) = nsyms; | |
732 | } | |
733 | ||
734 | static int | |
735 | size_hashed_expandable (const struct dictionary *dict) | |
736 | { | |
737 | return DICT_HASHED_EXPANDABLE_NSYMS (dict); | |
738 | } | |
739 | ||
740 | static void | |
741 | expand_hashtable (struct dictionary *dict) | |
742 | { | |
743 | int old_nbuckets = DICT_HASHED_NBUCKETS (dict); | |
744 | struct symbol **old_buckets = DICT_HASHED_BUCKETS (dict); | |
745 | int new_nbuckets = 2*old_nbuckets + 1; | |
746 | struct symbol **new_buckets = xcalloc (new_nbuckets, | |
747 | sizeof (struct symbol *)); | |
748 | int i; | |
749 | ||
750 | DICT_HASHED_NBUCKETS (dict) = new_nbuckets; | |
751 | DICT_HASHED_BUCKETS (dict) = new_buckets; | |
752 | ||
6595d32b MS |
753 | for (i = 0; i < old_nbuckets; ++i) |
754 | { | |
755 | struct symbol *sym, *next_sym; | |
756 | ||
757 | sym = old_buckets[i]; | |
758 | if (sym != NULL) | |
759 | { | |
760 | for (next_sym = sym->hash_next; | |
761 | next_sym != NULL; | |
762 | next_sym = sym->hash_next) | |
763 | { | |
764 | insert_symbol_hashed (dict, sym); | |
765 | sym = next_sym; | |
766 | } | |
767 | ||
768 | insert_symbol_hashed (dict, sym); | |
769 | } | |
de4f826b | 770 | } |
de4f826b DC |
771 | |
772 | xfree (old_buckets); | |
773 | } | |
774 | ||
c4d840bd PH |
775 | /* Produce an unsigned hash value from STRING0 that is consistent |
776 | with strcmp_iw, strcmp, and, at least on Ada symbols, wild_match. | |
777 | That is, two identifiers equivalent according to any of those three | |
778 | comparison operators hash to the same value. */ | |
779 | ||
780 | static unsigned int | |
1d2a4540 | 781 | dict_hash (const char *string0) |
c4d840bd PH |
782 | { |
783 | /* The Ada-encoded version of a name P1.P2...Pn has either the form | |
784 | P1__P2__...Pn<suffix> or _ada_P1__P2__...Pn<suffix> (where the Pi | |
785 | are lower-cased identifiers). The <suffix> (which can be empty) | |
786 | encodes additional information about the denoted entity. This | |
787 | routine hashes such names to msymbol_hash_iw(Pn). It actually | |
788 | does this for a superset of both valid Pi and of <suffix>, but | |
789 | in other cases it simply returns msymbol_hash_iw(STRING0). */ | |
790 | ||
1d2a4540 | 791 | const char *string; |
c4d840bd | 792 | unsigned int hash; |
c4d840bd | 793 | |
1d2a4540 PH |
794 | string = string0; |
795 | if (*string == '_') | |
796 | { | |
797 | if (strncmp (string, "_ada_", 5) == 0) | |
798 | string += 5; | |
799 | else | |
800 | return msymbol_hash_iw (string0); | |
801 | } | |
c4d840bd PH |
802 | |
803 | hash = 0; | |
804 | while (*string) | |
805 | { | |
806 | switch (*string) | |
807 | { | |
808 | case '$': | |
809 | case '.': | |
810 | case 'X': | |
1d2a4540 PH |
811 | if (string0 == string) |
812 | return msymbol_hash_iw (string0); | |
813 | else | |
814 | return hash; | |
c4d840bd | 815 | case ' ': |
1d2a4540 PH |
816 | case '(': |
817 | return msymbol_hash_iw (string0); | |
c4d840bd | 818 | case '_': |
1d2a4540 | 819 | if (string[1] == '_' && string != string0) |
c4d840bd | 820 | { |
558b1900 JB |
821 | int c = string[2]; |
822 | ||
823 | if ((c < 'a' || c > 'z') && c != 'O') | |
c4d840bd PH |
824 | return hash; |
825 | hash = 0; | |
826 | string += 2; | |
827 | break; | |
828 | } | |
829 | /* FALL THROUGH */ | |
830 | default: | |
831 | hash = hash * 67 + *string - 113; | |
832 | string += 1; | |
833 | break; | |
834 | } | |
835 | } | |
836 | return hash; | |
837 | } | |
838 | ||
de4f826b DC |
839 | /* Functions for DICT_LINEAR and DICT_LINEAR_EXPANDABLE. */ |
840 | ||
841 | static struct symbol * | |
842 | iterator_first_linear (const struct dictionary *dict, | |
843 | struct dict_iterator *iterator) | |
844 | { | |
845 | DICT_ITERATOR_DICT (iterator) = dict; | |
846 | DICT_ITERATOR_INDEX (iterator) = 0; | |
847 | return DICT_LINEAR_NSYMS (dict) ? DICT_LINEAR_SYM (dict, 0) : NULL; | |
848 | } | |
849 | ||
850 | static struct symbol * | |
851 | iterator_next_linear (struct dict_iterator *iterator) | |
852 | { | |
853 | const struct dictionary *dict = DICT_ITERATOR_DICT (iterator); | |
854 | ||
855 | if (++DICT_ITERATOR_INDEX (iterator) >= DICT_LINEAR_NSYMS (dict)) | |
856 | return NULL; | |
857 | else | |
858 | return DICT_LINEAR_SYM (dict, DICT_ITERATOR_INDEX (iterator)); | |
859 | } | |
860 | ||
861 | static struct symbol * | |
c4d840bd | 862 | iter_match_first_linear (const struct dictionary *dict, |
2edb89d3 | 863 | const char *name, symbol_compare_ftype *compare, |
c4d840bd | 864 | struct dict_iterator *iterator) |
de4f826b DC |
865 | { |
866 | DICT_ITERATOR_DICT (iterator) = dict; | |
867 | DICT_ITERATOR_INDEX (iterator) = -1; | |
868 | ||
c4d840bd | 869 | return iter_match_next_linear (name, compare, iterator); |
de4f826b DC |
870 | } |
871 | ||
872 | static struct symbol * | |
2edb89d3 | 873 | iter_match_next_linear (const char *name, symbol_compare_ftype *compare, |
c4d840bd | 874 | struct dict_iterator *iterator) |
de4f826b DC |
875 | { |
876 | const struct dictionary *dict = DICT_ITERATOR_DICT (iterator); | |
877 | int i, nsyms = DICT_LINEAR_NSYMS (dict); | |
878 | struct symbol *sym, *retval = NULL; | |
879 | ||
880 | for (i = DICT_ITERATOR_INDEX (iterator) + 1; i < nsyms; ++i) | |
881 | { | |
882 | sym = DICT_LINEAR_SYM (dict, i); | |
c4d840bd | 883 | if (compare (SYMBOL_SEARCH_NAME (sym), name) == 0) |
de4f826b DC |
884 | { |
885 | retval = sym; | |
886 | break; | |
887 | } | |
888 | } | |
889 | ||
890 | DICT_ITERATOR_INDEX (iterator) = i; | |
891 | ||
892 | return retval; | |
893 | } | |
894 | ||
895 | static int | |
896 | size_linear (const struct dictionary *dict) | |
897 | { | |
898 | return DICT_LINEAR_NSYMS (dict); | |
899 | } | |
900 | ||
901 | /* Functions only for DICT_LINEAR_EXPANDABLE. */ | |
902 | ||
903 | static void | |
904 | free_linear_expandable (struct dictionary *dict) | |
905 | { | |
906 | xfree (DICT_LINEAR_SYMS (dict)); | |
907 | xfree (dict); | |
908 | } | |
909 | ||
910 | ||
911 | static void | |
912 | add_symbol_linear_expandable (struct dictionary *dict, | |
913 | struct symbol *sym) | |
914 | { | |
915 | int nsyms = ++DICT_LINEAR_NSYMS (dict); | |
916 | ||
917 | /* Do we have enough room? If not, grow it. */ | |
6595d32b MS |
918 | if (nsyms > DICT_LINEAR_EXPANDABLE_CAPACITY (dict)) |
919 | { | |
920 | DICT_LINEAR_EXPANDABLE_CAPACITY (dict) *= 2; | |
921 | DICT_LINEAR_SYMS (dict) | |
922 | = xrealloc (DICT_LINEAR_SYMS (dict), | |
923 | DICT_LINEAR_EXPANDABLE_CAPACITY (dict) | |
924 | * sizeof (struct symbol *)); | |
925 | } | |
de4f826b DC |
926 | |
927 | DICT_LINEAR_SYM (dict, nsyms - 1) = sym; | |
928 | } |