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0823efed | 1 | /* A type-safe hash table template. |
85ec4feb | 2 | Copyright (C) 2012-2018 Free Software Foundation, Inc. |
0823efed DN |
3 | Contributed by Lawrence Crowl <crowl@google.com> |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | ||
22 | /* This file implements a typed hash table. | |
5831a5f0 LC |
23 | The implementation borrows from libiberty's htab_t in hashtab.h. |
24 | ||
25 | ||
26 | INTRODUCTION TO TYPES | |
27 | ||
28 | Users of the hash table generally need to be aware of three types. | |
29 | ||
30 | 1. The type being placed into the hash table. This type is called | |
31 | the value type. | |
32 | ||
33 | 2. The type used to describe how to handle the value type within | |
34 | the hash table. This descriptor type provides the hash table with | |
35 | several things. | |
36 | ||
37 | - A typedef named 'value_type' to the value type (from above). | |
38 | ||
39 | - A static member function named 'hash' that takes a value_type | |
8998354f | 40 | (or 'const value_type &') and returns a hashval_t value. |
5831a5f0 | 41 | |
8998354f | 42 | - A typedef named 'compare_type' that is used to test when a value |
5831a5f0 LC |
43 | is found. This type is the comparison type. Usually, it will be the |
44 | same as value_type. If it is not the same type, you must generally | |
45 | explicitly compute hash values and pass them to the hash table. | |
46 | ||
47 | - A static member function named 'equal' that takes a value_type | |
8998354f RS |
48 | and a compare_type, and returns a bool. Both arguments can be |
49 | const references. | |
5831a5f0 LC |
50 | |
51 | - A static function named 'remove' that takes an value_type pointer | |
52 | and frees the memory allocated by it. This function is used when | |
53 | individual elements of the table need to be disposed of (e.g., | |
54 | when deleting a hash table, removing elements from the table, etc). | |
55 | ||
08ec2754 RS |
56 | - An optional static function named 'keep_cache_entry'. This |
57 | function is provided only for garbage-collected elements that | |
58 | are not marked by the normal gc mark pass. It describes what | |
59 | what should happen to the element at the end of the gc mark phase. | |
60 | The return value should be: | |
61 | - 0 if the element should be deleted | |
62 | - 1 if the element should be kept and needs to be marked | |
63 | - -1 if the element should be kept and is already marked. | |
64 | Returning -1 rather than 1 is purely an optimization. | |
65 | ||
5831a5f0 LC |
66 | 3. The type of the hash table itself. (More later.) |
67 | ||
68 | In very special circumstances, users may need to know about a fourth type. | |
69 | ||
70 | 4. The template type used to describe how hash table memory | |
71 | is allocated. This type is called the allocator type. It is | |
8998354f | 72 | parameterized on the value type. It provides two functions: |
5831a5f0 | 73 | |
5831a5f0 LC |
74 | - A static member function named 'data_alloc'. This function |
75 | allocates the data elements in the table. | |
76 | ||
77 | - A static member function named 'data_free'. This function | |
78 | deallocates the data elements in the table. | |
79 | ||
80 | Hash table are instantiated with two type arguments. | |
81 | ||
82 | * The descriptor type, (2) above. | |
83 | ||
84 | * The allocator type, (4) above. In general, you will not need to | |
85 | provide your own allocator type. By default, hash tables will use | |
86 | the class template xcallocator, which uses malloc/free for allocation. | |
87 | ||
88 | ||
89 | DEFINING A DESCRIPTOR TYPE | |
90 | ||
91 | The first task in using the hash table is to describe the element type. | |
92 | We compose this into a few steps. | |
93 | ||
94 | 1. Decide on a removal policy for values stored in the table. | |
6c907cff | 95 | hash-traits.h provides class templates for the four most common |
ca752f39 | 96 | policies: |
5831a5f0 LC |
97 | |
98 | * typed_free_remove implements the static 'remove' member function | |
99 | by calling free(). | |
100 | ||
101 | * typed_noop_remove implements the static 'remove' member function | |
102 | by doing nothing. | |
103 | ||
ca752f39 RS |
104 | * ggc_remove implements the static 'remove' member by doing nothing, |
105 | but instead provides routines for gc marking and for PCH streaming. | |
106 | Use this for garbage-collected data that needs to be preserved across | |
107 | collections. | |
108 | ||
6c907cff RS |
109 | * ggc_cache_remove is like ggc_remove, except that it does not |
110 | mark the entries during the normal gc mark phase. Instead it | |
111 | uses 'keep_cache_entry' (described above) to keep elements that | |
112 | were not collected and delete those that were. Use this for | |
113 | garbage-collected caches that should not in themselves stop | |
114 | the data from being collected. | |
115 | ||
5831a5f0 LC |
116 | You can use these policies by simply deriving the descriptor type |
117 | from one of those class template, with the appropriate argument. | |
118 | ||
119 | Otherwise, you need to write the static 'remove' member function | |
120 | in the descriptor class. | |
121 | ||
122 | 2. Choose a hash function. Write the static 'hash' member function. | |
123 | ||
8998354f RS |
124 | 3. Decide whether the lookup function should take as input an object |
125 | of type value_type or something more restricted. Define compare_type | |
126 | accordingly. | |
5831a5f0 | 127 | |
8998354f RS |
128 | 4. Choose an equality testing function 'equal' that compares a value_type |
129 | and a compare_type. | |
130 | ||
131 | If your elements are pointers, it is usually easiest to start with one | |
132 | of the generic pointer descriptors described below and override the bits | |
133 | you need to change. | |
5831a5f0 LC |
134 | |
135 | AN EXAMPLE DESCRIPTOR TYPE | |
136 | ||
137 | Suppose you want to put some_type into the hash table. You could define | |
138 | the descriptor type as follows. | |
139 | ||
8d67ee55 RS |
140 | struct some_type_hasher : nofree_ptr_hash <some_type> |
141 | // Deriving from nofree_ptr_hash means that we get a 'remove' that does | |
5831a5f0 LC |
142 | // nothing. This choice is good for raw values. |
143 | { | |
5831a5f0 LC |
144 | static inline hashval_t hash (const value_type *); |
145 | static inline bool equal (const value_type *, const compare_type *); | |
146 | }; | |
147 | ||
148 | inline hashval_t | |
149 | some_type_hasher::hash (const value_type *e) | |
150 | { ... compute and return a hash value for E ... } | |
151 | ||
152 | inline bool | |
153 | some_type_hasher::equal (const value_type *p1, const compare_type *p2) | |
154 | { ... compare P1 vs P2. Return true if they are the 'same' ... } | |
155 | ||
156 | ||
157 | AN EXAMPLE HASH_TABLE DECLARATION | |
158 | ||
159 | To instantiate a hash table for some_type: | |
160 | ||
161 | hash_table <some_type_hasher> some_type_hash_table; | |
162 | ||
163 | There is no need to mention some_type directly, as the hash table will | |
164 | obtain it using some_type_hasher::value_type. | |
165 | ||
026c3cfd | 166 | You can then use any of the functions in hash_table's public interface. |
5831a5f0 LC |
167 | See hash_table for details. The interface is very similar to libiberty's |
168 | htab_t. | |
169 | ||
170 | ||
171 | EASY DESCRIPTORS FOR POINTERS | |
172 | ||
8998354f RS |
173 | There are four descriptors for pointer elements, one for each of |
174 | the removal policies above: | |
175 | ||
176 | * nofree_ptr_hash (based on typed_noop_remove) | |
177 | * free_ptr_hash (based on typed_free_remove) | |
178 | * ggc_ptr_hash (based on ggc_remove) | |
179 | * ggc_cache_ptr_hash (based on ggc_cache_remove) | |
180 | ||
181 | These descriptors hash and compare elements by their pointer value, | |
182 | rather than what they point to. So, to instantiate a hash table over | |
183 | pointers to whatever_type, without freeing the whatever_types, use: | |
5831a5f0 | 184 | |
8998354f | 185 | hash_table <nofree_ptr_hash <whatever_type> > whatever_type_hash_table; |
5831a5f0 | 186 | |
bf190e8d LC |
187 | |
188 | HASH TABLE ITERATORS | |
189 | ||
190 | The hash table provides standard C++ iterators. For example, consider a | |
191 | hash table of some_info. We wish to consume each element of the table: | |
192 | ||
193 | extern void consume (some_info *); | |
194 | ||
195 | We define a convenience typedef and the hash table: | |
196 | ||
197 | typedef hash_table <some_info_hasher> info_table_type; | |
198 | info_table_type info_table; | |
199 | ||
200 | Then we write the loop in typical C++ style: | |
201 | ||
202 | for (info_table_type::iterator iter = info_table.begin (); | |
203 | iter != info_table.end (); | |
204 | ++iter) | |
205 | if ((*iter).status == INFO_READY) | |
206 | consume (&*iter); | |
207 | ||
208 | Or with common sub-expression elimination: | |
209 | ||
210 | for (info_table_type::iterator iter = info_table.begin (); | |
211 | iter != info_table.end (); | |
212 | ++iter) | |
213 | { | |
214 | some_info &elem = *iter; | |
215 | if (elem.status == INFO_READY) | |
216 | consume (&elem); | |
217 | } | |
218 | ||
219 | One can also use a more typical GCC style: | |
220 | ||
221 | typedef some_info *some_info_p; | |
222 | some_info *elem_ptr; | |
223 | info_table_type::iterator iter; | |
224 | FOR_EACH_HASH_TABLE_ELEMENT (info_table, elem_ptr, some_info_p, iter) | |
225 | if (elem_ptr->status == INFO_READY) | |
226 | consume (elem_ptr); | |
227 | ||
5831a5f0 | 228 | */ |
0823efed DN |
229 | |
230 | ||
231 | #ifndef TYPED_HASHTAB_H | |
232 | #define TYPED_HASHTAB_H | |
233 | ||
13fdf2e2 | 234 | #include "statistics.h" |
b086d530 | 235 | #include "ggc.h" |
13fdf2e2 | 236 | #include "vec.h" |
0823efed | 237 | #include "hashtab.h" |
13fdf2e2 | 238 | #include "inchash.h" |
2d44c7de | 239 | #include "mem-stats-traits.h" |
f11c3779 | 240 | #include "hash-traits.h" |
13fdf2e2 | 241 | #include "hash-map-traits.h" |
0823efed | 242 | |
b086d530 TS |
243 | template<typename, typename, typename> class hash_map; |
244 | template<typename, typename> class hash_set; | |
0823efed DN |
245 | |
246 | /* The ordinary memory allocator. */ | |
247 | /* FIXME (crowl): This allocator may be extracted for wider sharing later. */ | |
248 | ||
249 | template <typename Type> | |
250 | struct xcallocator | |
251 | { | |
0823efed | 252 | static Type *data_alloc (size_t count); |
0823efed DN |
253 | static void data_free (Type *memory); |
254 | }; | |
255 | ||
256 | ||
5831a5f0 | 257 | /* Allocate memory for COUNT data blocks. */ |
0823efed DN |
258 | |
259 | template <typename Type> | |
260 | inline Type * | |
261 | xcallocator <Type>::data_alloc (size_t count) | |
262 | { | |
263 | return static_cast <Type *> (xcalloc (count, sizeof (Type))); | |
264 | } | |
265 | ||
266 | ||
0823efed DN |
267 | /* Free memory for data blocks. */ |
268 | ||
269 | template <typename Type> | |
270 | inline void | |
271 | xcallocator <Type>::data_free (Type *memory) | |
272 | { | |
273 | return ::free (memory); | |
274 | } | |
275 | ||
276 | ||
0823efed DN |
277 | /* Table of primes and their inversion information. */ |
278 | ||
279 | struct prime_ent | |
280 | { | |
281 | hashval_t prime; | |
282 | hashval_t inv; | |
283 | hashval_t inv_m2; /* inverse of prime-2 */ | |
284 | hashval_t shift; | |
285 | }; | |
286 | ||
287 | extern struct prime_ent const prime_tab[]; | |
288 | ||
289 | ||
290 | /* Functions for computing hash table indexes. */ | |
291 | ||
6db4bc6e JH |
292 | extern unsigned int hash_table_higher_prime_index (unsigned long n) |
293 | ATTRIBUTE_PURE; | |
294 | ||
295 | /* Return X % Y using multiplicative inverse values INV and SHIFT. | |
296 | ||
297 | The multiplicative inverses computed above are for 32-bit types, | |
298 | and requires that we be able to compute a highpart multiply. | |
299 | ||
300 | FIX: I am not at all convinced that | |
301 | 3 loads, 2 multiplications, 3 shifts, and 3 additions | |
302 | will be faster than | |
303 | 1 load and 1 modulus | |
304 | on modern systems running a compiler. */ | |
305 | ||
306 | inline hashval_t | |
307 | mul_mod (hashval_t x, hashval_t y, hashval_t inv, int shift) | |
308 | { | |
309 | hashval_t t1, t2, t3, t4, q, r; | |
310 | ||
311 | t1 = ((uint64_t)x * inv) >> 32; | |
312 | t2 = x - t1; | |
313 | t3 = t2 >> 1; | |
314 | t4 = t1 + t3; | |
315 | q = t4 >> shift; | |
316 | r = x - (q * y); | |
317 | ||
318 | return r; | |
319 | } | |
320 | ||
321 | /* Compute the primary table index for HASH given current prime index. */ | |
322 | ||
323 | inline hashval_t | |
324 | hash_table_mod1 (hashval_t hash, unsigned int index) | |
325 | { | |
326 | const struct prime_ent *p = &prime_tab[index]; | |
327 | gcc_checking_assert (sizeof (hashval_t) * CHAR_BIT <= 32); | |
57c49199 | 328 | return mul_mod (hash, p->prime, p->inv, p->shift); |
6db4bc6e JH |
329 | } |
330 | ||
331 | /* Compute the secondary table index for HASH given current prime index. */ | |
332 | ||
333 | inline hashval_t | |
334 | hash_table_mod2 (hashval_t hash, unsigned int index) | |
335 | { | |
336 | const struct prime_ent *p = &prime_tab[index]; | |
337 | gcc_checking_assert (sizeof (hashval_t) * CHAR_BIT <= 32); | |
338 | return 1 + mul_mod (hash, p->prime - 2, p->inv_m2, p->shift); | |
339 | } | |
0823efed | 340 | |
2d44c7de ML |
341 | class mem_usage; |
342 | ||
0823efed DN |
343 | /* User-facing hash table type. |
344 | ||
8998354f RS |
345 | The table stores elements of type Descriptor::value_type and uses |
346 | the static descriptor functions described at the top of the file | |
347 | to hash, compare and remove elements. | |
0823efed | 348 | |
5831a5f0 | 349 | Specify the template Allocator to allocate and free memory. |
0823efed DN |
350 | The default is xcallocator. |
351 | ||
84baa4b9 TS |
352 | Storage is an implementation detail and should not be used outside the |
353 | hash table code. | |
354 | ||
0823efed | 355 | */ |
5831a5f0 | 356 | template <typename Descriptor, |
67f58944 | 357 | template<typename Type> class Allocator = xcallocator> |
0823efed | 358 | class hash_table |
84baa4b9 TS |
359 | { |
360 | typedef typename Descriptor::value_type value_type; | |
361 | typedef typename Descriptor::compare_type compare_type; | |
362 | ||
363 | public: | |
f5c08287 MM |
364 | explicit hash_table (size_t, bool ggc = false, |
365 | bool gather_mem_stats = GATHER_STATISTICS, | |
643e0a30 | 366 | mem_alloc_origin origin = HASH_TABLE_ORIGIN |
2d44c7de | 367 | CXX_MEM_STAT_INFO); |
951c9e90 JM |
368 | explicit hash_table (const hash_table &, bool ggc = false, |
369 | bool gather_mem_stats = GATHER_STATISTICS, | |
370 | mem_alloc_origin origin = HASH_TABLE_ORIGIN | |
371 | CXX_MEM_STAT_INFO); | |
84baa4b9 TS |
372 | ~hash_table (); |
373 | ||
2a22f99c | 374 | /* Create a hash_table in gc memory. */ |
2a22f99c | 375 | static hash_table * |
2d44c7de | 376 | create_ggc (size_t n CXX_MEM_STAT_INFO) |
2a22f99c TS |
377 | { |
378 | hash_table *table = ggc_alloc<hash_table> (); | |
f5c08287 MM |
379 | new (table) hash_table (n, true, GATHER_STATISTICS, |
380 | HASH_TABLE_ORIGIN PASS_MEM_STAT); | |
2a22f99c TS |
381 | return table; |
382 | } | |
383 | ||
84baa4b9 TS |
384 | /* Current size (in entries) of the hash table. */ |
385 | size_t size () const { return m_size; } | |
386 | ||
387 | /* Return the current number of elements in this hash table. */ | |
388 | size_t elements () const { return m_n_elements - m_n_deleted; } | |
389 | ||
390 | /* Return the current number of elements in this hash table. */ | |
391 | size_t elements_with_deleted () const { return m_n_elements; } | |
392 | ||
677cb11d RS |
393 | /* This function clears all entries in this hash table. */ |
394 | void empty () { if (elements ()) empty_slow (); } | |
84baa4b9 TS |
395 | |
396 | /* This function clears a specified SLOT in a hash table. It is | |
397 | useful when you've already done the lookup and don't want to do it | |
398 | again. */ | |
84baa4b9 TS |
399 | void clear_slot (value_type *); |
400 | ||
401 | /* This function searches for a hash table entry equal to the given | |
402 | COMPARABLE element starting with the given HASH value. It cannot | |
403 | be used to insert or delete an element. */ | |
404 | value_type &find_with_hash (const compare_type &, hashval_t); | |
405 | ||
8998354f | 406 | /* Like find_slot_with_hash, but compute the hash value from the element. */ |
84baa4b9 TS |
407 | value_type &find (const value_type &value) |
408 | { | |
409 | return find_with_hash (value, Descriptor::hash (value)); | |
410 | } | |
411 | ||
412 | value_type *find_slot (const value_type &value, insert_option insert) | |
413 | { | |
414 | return find_slot_with_hash (value, Descriptor::hash (value), insert); | |
415 | } | |
416 | ||
417 | /* This function searches for a hash table slot containing an entry | |
418 | equal to the given COMPARABLE element and starting with the given | |
419 | HASH. To delete an entry, call this with insert=NO_INSERT, then | |
420 | call clear_slot on the slot returned (possibly after doing some | |
421 | checks). To insert an entry, call this with insert=INSERT, then | |
422 | write the value you want into the returned slot. When inserting an | |
423 | entry, NULL may be returned if memory allocation fails. */ | |
424 | value_type *find_slot_with_hash (const compare_type &comparable, | |
425 | hashval_t hash, enum insert_option insert); | |
426 | ||
427 | /* This function deletes an element with the given COMPARABLE value | |
428 | from hash table starting with the given HASH. If there is no | |
429 | matching element in the hash table, this function does nothing. */ | |
430 | void remove_elt_with_hash (const compare_type &, hashval_t); | |
431 | ||
8998354f RS |
432 | /* Like remove_elt_with_hash, but compute the hash value from the |
433 | element. */ | |
84baa4b9 TS |
434 | void remove_elt (const value_type &value) |
435 | { | |
436 | remove_elt_with_hash (value, Descriptor::hash (value)); | |
437 | } | |
438 | ||
439 | /* This function scans over the entire hash table calling CALLBACK for | |
440 | each live entry. If CALLBACK returns false, the iteration stops. | |
441 | ARGUMENT is passed as CALLBACK's second argument. */ | |
442 | template <typename Argument, | |
443 | int (*Callback) (value_type *slot, Argument argument)> | |
444 | void traverse_noresize (Argument argument); | |
445 | ||
446 | /* Like traverse_noresize, but does resize the table when it is too empty | |
447 | to improve effectivity of subsequent calls. */ | |
448 | template <typename Argument, | |
449 | int (*Callback) (value_type *slot, Argument argument)> | |
450 | void traverse (Argument argument); | |
451 | ||
452 | class iterator | |
453 | { | |
454 | public: | |
455 | iterator () : m_slot (NULL), m_limit (NULL) {} | |
456 | ||
457 | iterator (value_type *slot, value_type *limit) : | |
458 | m_slot (slot), m_limit (limit) {} | |
459 | ||
460 | inline value_type &operator * () { return *m_slot; } | |
461 | void slide (); | |
462 | inline iterator &operator ++ (); | |
463 | bool operator != (const iterator &other) const | |
464 | { | |
465 | return m_slot != other.m_slot || m_limit != other.m_limit; | |
466 | } | |
467 | ||
468 | private: | |
469 | value_type *m_slot; | |
470 | value_type *m_limit; | |
471 | }; | |
472 | ||
473 | iterator begin () const | |
474 | { | |
475 | iterator iter (m_entries, m_entries + m_size); | |
476 | iter.slide (); | |
477 | return iter; | |
478 | } | |
479 | ||
480 | iterator end () const { return iterator (); } | |
481 | ||
482 | double collisions () const | |
483 | { | |
484 | return m_searches ? static_cast <double> (m_collisions) / m_searches : 0; | |
485 | } | |
486 | ||
487 | private: | |
b086d530 TS |
488 | template<typename T> friend void gt_ggc_mx (hash_table<T> *); |
489 | template<typename T> friend void gt_pch_nx (hash_table<T> *); | |
2a22f99c TS |
490 | template<typename T> friend void |
491 | hashtab_entry_note_pointers (void *, void *, gt_pointer_operator, void *); | |
492 | template<typename T, typename U, typename V> friend void | |
493 | gt_pch_nx (hash_map<T, U, V> *, gt_pointer_operator, void *); | |
494 | template<typename T, typename U> friend void gt_pch_nx (hash_set<T, U> *, | |
495 | gt_pointer_operator, | |
496 | void *); | |
497 | template<typename T> friend void gt_pch_nx (hash_table<T> *, | |
498 | gt_pointer_operator, void *); | |
84baa4b9 | 499 | |
08ec2754 RS |
500 | template<typename T> friend void gt_cleare_cache (hash_table<T> *); |
501 | ||
677cb11d RS |
502 | void empty_slow (); |
503 | ||
61ebff31 | 504 | value_type *alloc_entries (size_t n CXX_MEM_STAT_INFO) const; |
84baa4b9 | 505 | value_type *find_empty_slot_for_expand (hashval_t); |
d3da63e5 | 506 | bool too_empty_p (unsigned int); |
84baa4b9 TS |
507 | void expand (); |
508 | static bool is_deleted (value_type &v) | |
4c1177e1 RS |
509 | { |
510 | return Descriptor::is_deleted (v); | |
511 | } | |
512 | ||
84baa4b9 | 513 | static bool is_empty (value_type &v) |
4c1177e1 RS |
514 | { |
515 | return Descriptor::is_empty (v); | |
516 | } | |
84baa4b9 TS |
517 | |
518 | static void mark_deleted (value_type &v) | |
4c1177e1 RS |
519 | { |
520 | Descriptor::mark_deleted (v); | |
521 | } | |
84baa4b9 TS |
522 | |
523 | static void mark_empty (value_type &v) | |
4c1177e1 RS |
524 | { |
525 | Descriptor::mark_empty (v); | |
526 | } | |
84baa4b9 TS |
527 | |
528 | /* Table itself. */ | |
529 | typename Descriptor::value_type *m_entries; | |
530 | ||
531 | size_t m_size; | |
532 | ||
533 | /* Current number of elements including also deleted elements. */ | |
534 | size_t m_n_elements; | |
535 | ||
536 | /* Current number of deleted elements in the table. */ | |
537 | size_t m_n_deleted; | |
538 | ||
539 | /* The following member is used for debugging. Its value is number | |
540 | of all calls of `htab_find_slot' for the hash table. */ | |
541 | unsigned int m_searches; | |
542 | ||
543 | /* The following member is used for debugging. Its value is number | |
544 | of collisions fixed for time of work with the hash table. */ | |
545 | unsigned int m_collisions; | |
546 | ||
547 | /* Current size (in entries) of the hash table, as an index into the | |
548 | table of primes. */ | |
549 | unsigned int m_size_prime_index; | |
b086d530 TS |
550 | |
551 | /* if m_entries is stored in ggc memory. */ | |
552 | bool m_ggc; | |
2d44c7de ML |
553 | |
554 | /* If we should gather memory statistics for the table. */ | |
555 | bool m_gather_mem_stats; | |
84baa4b9 TS |
556 | }; |
557 | ||
2d44c7de ML |
558 | /* As mem-stats.h heavily utilizes hash maps (hash tables), we have to include |
559 | mem-stats.h after hash_table declaration. */ | |
560 | ||
561 | #include "mem-stats.h" | |
562 | #include "hash-map.h" | |
2d44c7de ML |
563 | |
564 | extern mem_alloc_description<mem_usage> hash_table_usage; | |
565 | ||
566 | /* Support function for statistics. */ | |
567 | extern void dump_hash_table_loc_statistics (void); | |
568 | ||
84baa4b9 | 569 | template<typename Descriptor, template<typename Type> class Allocator> |
2d44c7de ML |
570 | hash_table<Descriptor, Allocator>::hash_table (size_t size, bool ggc, bool |
571 | gather_mem_stats, | |
572 | mem_alloc_origin origin | |
573 | MEM_STAT_DECL) : | |
b086d530 | 574 | m_n_elements (0), m_n_deleted (0), m_searches (0), m_collisions (0), |
2d44c7de | 575 | m_ggc (ggc), m_gather_mem_stats (gather_mem_stats) |
84baa4b9 TS |
576 | { |
577 | unsigned int size_prime_index; | |
578 | ||
579 | size_prime_index = hash_table_higher_prime_index (size); | |
580 | size = prime_tab[size_prime_index].prime; | |
581 | ||
2d44c7de ML |
582 | if (m_gather_mem_stats) |
583 | hash_table_usage.register_descriptor (this, origin, ggc | |
584 | FINAL_PASS_MEM_STAT); | |
585 | ||
61ebff31 | 586 | m_entries = alloc_entries (size PASS_MEM_STAT); |
84baa4b9 TS |
587 | m_size = size; |
588 | m_size_prime_index = size_prime_index; | |
589 | } | |
590 | ||
fa583f9e JM |
591 | template<typename Descriptor, template<typename Type> class Allocator> |
592 | hash_table<Descriptor, Allocator>::hash_table (const hash_table &h, bool ggc, | |
593 | bool gather_mem_stats, | |
594 | mem_alloc_origin origin | |
595 | MEM_STAT_DECL) : | |
596 | m_n_elements (h.m_n_elements), m_n_deleted (h.m_n_deleted), | |
597 | m_searches (0), m_collisions (0), m_ggc (ggc), | |
598 | m_gather_mem_stats (gather_mem_stats) | |
599 | { | |
600 | size_t size = h.m_size; | |
601 | ||
602 | if (m_gather_mem_stats) | |
603 | hash_table_usage.register_descriptor (this, origin, ggc | |
604 | FINAL_PASS_MEM_STAT); | |
605 | ||
606 | value_type *nentries = alloc_entries (size PASS_MEM_STAT); | |
607 | for (size_t i = 0; i < size; ++i) | |
608 | { | |
609 | value_type &entry = h.m_entries[i]; | |
610 | if (is_deleted (entry)) | |
611 | mark_deleted (nentries[i]); | |
612 | else if (!is_empty (entry)) | |
613 | nentries[i] = entry; | |
614 | } | |
615 | m_entries = nentries; | |
616 | m_size = size; | |
617 | m_size_prime_index = h.m_size_prime_index; | |
618 | } | |
619 | ||
84baa4b9 | 620 | template<typename Descriptor, template<typename Type> class Allocator> |
67f58944 | 621 | hash_table<Descriptor, Allocator>::~hash_table () |
84baa4b9 TS |
622 | { |
623 | for (size_t i = m_size - 1; i < m_size; i--) | |
624 | if (!is_empty (m_entries[i]) && !is_deleted (m_entries[i])) | |
625 | Descriptor::remove (m_entries[i]); | |
626 | ||
b086d530 TS |
627 | if (!m_ggc) |
628 | Allocator <value_type> ::data_free (m_entries); | |
629 | else | |
630 | ggc_free (m_entries); | |
2d44c7de ML |
631 | |
632 | if (m_gather_mem_stats) | |
633 | hash_table_usage.release_instance_overhead (this, | |
634 | sizeof (value_type) * m_size, | |
635 | true); | |
84baa4b9 TS |
636 | } |
637 | ||
1f012f56 TS |
638 | /* This function returns an array of empty hash table elements. */ |
639 | ||
640 | template<typename Descriptor, template<typename Type> class Allocator> | |
67f58944 TS |
641 | inline typename hash_table<Descriptor, Allocator>::value_type * |
642 | hash_table<Descriptor, Allocator>::alloc_entries (size_t n MEM_STAT_DECL) const | |
1f012f56 TS |
643 | { |
644 | value_type *nentries; | |
645 | ||
2d44c7de ML |
646 | if (m_gather_mem_stats) |
647 | hash_table_usage.register_instance_overhead (sizeof (value_type) * n, this); | |
648 | ||
1f012f56 TS |
649 | if (!m_ggc) |
650 | nentries = Allocator <value_type> ::data_alloc (n); | |
651 | else | |
61ebff31 | 652 | nentries = ::ggc_cleared_vec_alloc<value_type> (n PASS_MEM_STAT); |
1f012f56 TS |
653 | |
654 | gcc_assert (nentries != NULL); | |
655 | for (size_t i = 0; i < n; i++) | |
656 | mark_empty (nentries[i]); | |
657 | ||
658 | return nentries; | |
659 | } | |
660 | ||
84baa4b9 TS |
661 | /* Similar to find_slot, but without several unwanted side effects: |
662 | - Does not call equal when it finds an existing entry. | |
663 | - Does not change the count of elements/searches/collisions in the | |
664 | hash table. | |
665 | This function also assumes there are no deleted entries in the table. | |
666 | HASH is the hash value for the element to be inserted. */ | |
667 | ||
668 | template<typename Descriptor, template<typename Type> class Allocator> | |
67f58944 TS |
669 | typename hash_table<Descriptor, Allocator>::value_type * |
670 | hash_table<Descriptor, Allocator>::find_empty_slot_for_expand (hashval_t hash) | |
84baa4b9 TS |
671 | { |
672 | hashval_t index = hash_table_mod1 (hash, m_size_prime_index); | |
673 | size_t size = m_size; | |
674 | value_type *slot = m_entries + index; | |
675 | hashval_t hash2; | |
676 | ||
677 | if (is_empty (*slot)) | |
678 | return slot; | |
6db4bc6e | 679 | gcc_checking_assert (!is_deleted (*slot)); |
84baa4b9 TS |
680 | |
681 | hash2 = hash_table_mod2 (hash, m_size_prime_index); | |
682 | for (;;) | |
683 | { | |
684 | index += hash2; | |
685 | if (index >= size) | |
686 | index -= size; | |
687 | ||
688 | slot = m_entries + index; | |
689 | if (is_empty (*slot)) | |
690 | return slot; | |
6db4bc6e | 691 | gcc_checking_assert (!is_deleted (*slot)); |
84baa4b9 TS |
692 | } |
693 | } | |
694 | ||
d3da63e5 RS |
695 | /* Return true if the current table is excessively big for ELTS elements. */ |
696 | ||
697 | template<typename Descriptor, template<typename Type> class Allocator> | |
698 | inline bool | |
699 | hash_table<Descriptor, Allocator>::too_empty_p (unsigned int elts) | |
700 | { | |
701 | return elts * 8 < m_size && m_size > 32; | |
702 | } | |
703 | ||
84baa4b9 TS |
704 | /* The following function changes size of memory allocated for the |
705 | entries and repeatedly inserts the table elements. The occupancy | |
706 | of the table after the call will be about 50%. Naturally the hash | |
707 | table must already exist. Remember also that the place of the | |
708 | table entries is changed. If memory allocation fails, this function | |
709 | will abort. */ | |
710 | ||
8998354f | 711 | template<typename Descriptor, template<typename Type> class Allocator> |
84baa4b9 | 712 | void |
67f58944 | 713 | hash_table<Descriptor, Allocator>::expand () |
84baa4b9 TS |
714 | { |
715 | value_type *oentries = m_entries; | |
716 | unsigned int oindex = m_size_prime_index; | |
717 | size_t osize = size (); | |
718 | value_type *olimit = oentries + osize; | |
719 | size_t elts = elements (); | |
720 | ||
721 | /* Resize only when table after removal of unused elements is either | |
722 | too full or too empty. */ | |
723 | unsigned int nindex; | |
724 | size_t nsize; | |
d3da63e5 | 725 | if (elts * 2 > osize || too_empty_p (elts)) |
84baa4b9 TS |
726 | { |
727 | nindex = hash_table_higher_prime_index (elts * 2); | |
728 | nsize = prime_tab[nindex].prime; | |
729 | } | |
730 | else | |
731 | { | |
732 | nindex = oindex; | |
733 | nsize = osize; | |
734 | } | |
735 | ||
1f012f56 | 736 | value_type *nentries = alloc_entries (nsize); |
2d44c7de ML |
737 | |
738 | if (m_gather_mem_stats) | |
739 | hash_table_usage.release_instance_overhead (this, sizeof (value_type) | |
740 | * osize); | |
741 | ||
84baa4b9 TS |
742 | m_entries = nentries; |
743 | m_size = nsize; | |
744 | m_size_prime_index = nindex; | |
745 | m_n_elements -= m_n_deleted; | |
746 | m_n_deleted = 0; | |
747 | ||
748 | value_type *p = oentries; | |
749 | do | |
750 | { | |
751 | value_type &x = *p; | |
752 | ||
753 | if (!is_empty (x) && !is_deleted (x)) | |
754 | { | |
755 | value_type *q = find_empty_slot_for_expand (Descriptor::hash (x)); | |
756 | ||
757 | *q = x; | |
758 | } | |
759 | ||
760 | p++; | |
761 | } | |
762 | while (p < olimit); | |
763 | ||
b086d530 TS |
764 | if (!m_ggc) |
765 | Allocator <value_type> ::data_free (oentries); | |
766 | else | |
767 | ggc_free (oentries); | |
84baa4b9 TS |
768 | } |
769 | ||
677cb11d RS |
770 | /* Implements empty() in cases where it isn't a no-op. */ |
771 | ||
84baa4b9 TS |
772 | template<typename Descriptor, template<typename Type> class Allocator> |
773 | void | |
677cb11d | 774 | hash_table<Descriptor, Allocator>::empty_slow () |
84baa4b9 TS |
775 | { |
776 | size_t size = m_size; | |
d3da63e5 | 777 | size_t nsize = size; |
84baa4b9 TS |
778 | value_type *entries = m_entries; |
779 | int i; | |
780 | ||
781 | for (i = size - 1; i >= 0; i--) | |
782 | if (!is_empty (entries[i]) && !is_deleted (entries[i])) | |
783 | Descriptor::remove (entries[i]); | |
784 | ||
785 | /* Instead of clearing megabyte, downsize the table. */ | |
d3da63e5 RS |
786 | if (size > 1024*1024 / sizeof (value_type)) |
787 | nsize = 1024 / sizeof (value_type); | |
788 | else if (too_empty_p (m_n_elements)) | |
789 | nsize = m_n_elements * 2; | |
790 | ||
791 | if (nsize != size) | |
84baa4b9 | 792 | { |
d3da63e5 | 793 | int nindex = hash_table_higher_prime_index (nsize); |
84baa4b9 TS |
794 | int nsize = prime_tab[nindex].prime; |
795 | ||
b086d530 | 796 | if (!m_ggc) |
1f012f56 | 797 | Allocator <value_type> ::data_free (m_entries); |
b086d530 | 798 | else |
1f012f56 | 799 | ggc_free (m_entries); |
b086d530 | 800 | |
1f012f56 | 801 | m_entries = alloc_entries (nsize); |
84baa4b9 TS |
802 | m_size = nsize; |
803 | m_size_prime_index = nindex; | |
804 | } | |
805 | else | |
c3684b7b MS |
806 | { |
807 | for ( ; size; ++entries, --size) | |
808 | *entries = value_type (); | |
809 | } | |
84baa4b9 TS |
810 | m_n_deleted = 0; |
811 | m_n_elements = 0; | |
812 | } | |
813 | ||
814 | /* This function clears a specified SLOT in a hash table. It is | |
815 | useful when you've already done the lookup and don't want to do it | |
816 | again. */ | |
817 | ||
818 | template<typename Descriptor, template<typename Type> class Allocator> | |
819 | void | |
67f58944 | 820 | hash_table<Descriptor, Allocator>::clear_slot (value_type *slot) |
84baa4b9 | 821 | { |
6db4bc6e JH |
822 | gcc_checking_assert (!(slot < m_entries || slot >= m_entries + size () |
823 | || is_empty (*slot) || is_deleted (*slot))); | |
84baa4b9 TS |
824 | |
825 | Descriptor::remove (*slot); | |
826 | ||
827 | mark_deleted (*slot); | |
828 | m_n_deleted++; | |
829 | } | |
830 | ||
831 | /* This function searches for a hash table entry equal to the given | |
832 | COMPARABLE element starting with the given HASH value. It cannot | |
833 | be used to insert or delete an element. */ | |
834 | ||
835 | template<typename Descriptor, template<typename Type> class Allocator> | |
67f58944 TS |
836 | typename hash_table<Descriptor, Allocator>::value_type & |
837 | hash_table<Descriptor, Allocator> | |
84baa4b9 TS |
838 | ::find_with_hash (const compare_type &comparable, hashval_t hash) |
839 | { | |
840 | m_searches++; | |
841 | size_t size = m_size; | |
842 | hashval_t index = hash_table_mod1 (hash, m_size_prime_index); | |
843 | ||
844 | value_type *entry = &m_entries[index]; | |
845 | if (is_empty (*entry) | |
846 | || (!is_deleted (*entry) && Descriptor::equal (*entry, comparable))) | |
847 | return *entry; | |
848 | ||
849 | hashval_t hash2 = hash_table_mod2 (hash, m_size_prime_index); | |
850 | for (;;) | |
851 | { | |
852 | m_collisions++; | |
853 | index += hash2; | |
854 | if (index >= size) | |
855 | index -= size; | |
856 | ||
857 | entry = &m_entries[index]; | |
858 | if (is_empty (*entry) | |
859 | || (!is_deleted (*entry) && Descriptor::equal (*entry, comparable))) | |
860 | return *entry; | |
861 | } | |
862 | } | |
863 | ||
864 | /* This function searches for a hash table slot containing an entry | |
865 | equal to the given COMPARABLE element and starting with the given | |
866 | HASH. To delete an entry, call this with insert=NO_INSERT, then | |
867 | call clear_slot on the slot returned (possibly after doing some | |
868 | checks). To insert an entry, call this with insert=INSERT, then | |
869 | write the value you want into the returned slot. When inserting an | |
870 | entry, NULL may be returned if memory allocation fails. */ | |
871 | ||
872 | template<typename Descriptor, template<typename Type> class Allocator> | |
67f58944 TS |
873 | typename hash_table<Descriptor, Allocator>::value_type * |
874 | hash_table<Descriptor, Allocator> | |
84baa4b9 TS |
875 | ::find_slot_with_hash (const compare_type &comparable, hashval_t hash, |
876 | enum insert_option insert) | |
877 | { | |
878 | if (insert == INSERT && m_size * 3 <= m_n_elements * 4) | |
879 | expand (); | |
880 | ||
881 | m_searches++; | |
882 | ||
883 | value_type *first_deleted_slot = NULL; | |
884 | hashval_t index = hash_table_mod1 (hash, m_size_prime_index); | |
885 | hashval_t hash2 = hash_table_mod2 (hash, m_size_prime_index); | |
886 | value_type *entry = &m_entries[index]; | |
887 | size_t size = m_size; | |
888 | if (is_empty (*entry)) | |
889 | goto empty_entry; | |
890 | else if (is_deleted (*entry)) | |
891 | first_deleted_slot = &m_entries[index]; | |
892 | else if (Descriptor::equal (*entry, comparable)) | |
893 | return &m_entries[index]; | |
894 | ||
895 | for (;;) | |
896 | { | |
897 | m_collisions++; | |
898 | index += hash2; | |
899 | if (index >= size) | |
900 | index -= size; | |
901 | ||
902 | entry = &m_entries[index]; | |
903 | if (is_empty (*entry)) | |
904 | goto empty_entry; | |
905 | else if (is_deleted (*entry)) | |
906 | { | |
907 | if (!first_deleted_slot) | |
908 | first_deleted_slot = &m_entries[index]; | |
909 | } | |
910 | else if (Descriptor::equal (*entry, comparable)) | |
911 | return &m_entries[index]; | |
912 | } | |
913 | ||
914 | empty_entry: | |
915 | if (insert == NO_INSERT) | |
916 | return NULL; | |
917 | ||
918 | if (first_deleted_slot) | |
919 | { | |
920 | m_n_deleted--; | |
921 | mark_empty (*first_deleted_slot); | |
922 | return first_deleted_slot; | |
923 | } | |
924 | ||
925 | m_n_elements++; | |
926 | return &m_entries[index]; | |
927 | } | |
928 | ||
929 | /* This function deletes an element with the given COMPARABLE value | |
930 | from hash table starting with the given HASH. If there is no | |
931 | matching element in the hash table, this function does nothing. */ | |
932 | ||
933 | template<typename Descriptor, template<typename Type> class Allocator> | |
934 | void | |
67f58944 | 935 | hash_table<Descriptor, Allocator> |
84baa4b9 TS |
936 | ::remove_elt_with_hash (const compare_type &comparable, hashval_t hash) |
937 | { | |
938 | value_type *slot = find_slot_with_hash (comparable, hash, NO_INSERT); | |
939 | if (is_empty (*slot)) | |
940 | return; | |
941 | ||
942 | Descriptor::remove (*slot); | |
943 | ||
944 | mark_deleted (*slot); | |
945 | m_n_deleted++; | |
946 | } | |
947 | ||
948 | /* This function scans over the entire hash table calling CALLBACK for | |
949 | each live entry. If CALLBACK returns false, the iteration stops. | |
950 | ARGUMENT is passed as CALLBACK's second argument. */ | |
951 | ||
952 | template<typename Descriptor, | |
953 | template<typename Type> class Allocator> | |
954 | template<typename Argument, | |
67f58944 TS |
955 | int (*Callback) |
956 | (typename hash_table<Descriptor, Allocator>::value_type *slot, | |
957 | Argument argument)> | |
84baa4b9 | 958 | void |
67f58944 | 959 | hash_table<Descriptor, Allocator>::traverse_noresize (Argument argument) |
84baa4b9 TS |
960 | { |
961 | value_type *slot = m_entries; | |
962 | value_type *limit = slot + size (); | |
963 | ||
964 | do | |
965 | { | |
966 | value_type &x = *slot; | |
967 | ||
968 | if (!is_empty (x) && !is_deleted (x)) | |
969 | if (! Callback (slot, argument)) | |
970 | break; | |
971 | } | |
972 | while (++slot < limit); | |
973 | } | |
974 | ||
975 | /* Like traverse_noresize, but does resize the table when it is too empty | |
976 | to improve effectivity of subsequent calls. */ | |
977 | ||
978 | template <typename Descriptor, | |
979 | template <typename Type> class Allocator> | |
980 | template <typename Argument, | |
67f58944 TS |
981 | int (*Callback) |
982 | (typename hash_table<Descriptor, Allocator>::value_type *slot, | |
983 | Argument argument)> | |
84baa4b9 | 984 | void |
67f58944 | 985 | hash_table<Descriptor, Allocator>::traverse (Argument argument) |
84baa4b9 | 986 | { |
d3da63e5 | 987 | if (too_empty_p (elements ())) |
84baa4b9 TS |
988 | expand (); |
989 | ||
990 | traverse_noresize <Argument, Callback> (argument); | |
991 | } | |
992 | ||
993 | /* Slide down the iterator slots until an active entry is found. */ | |
994 | ||
995 | template<typename Descriptor, template<typename Type> class Allocator> | |
996 | void | |
67f58944 | 997 | hash_table<Descriptor, Allocator>::iterator::slide () |
84baa4b9 TS |
998 | { |
999 | for ( ; m_slot < m_limit; ++m_slot ) | |
1000 | { | |
1001 | value_type &x = *m_slot; | |
1002 | if (!is_empty (x) && !is_deleted (x)) | |
1003 | return; | |
1004 | } | |
1005 | m_slot = NULL; | |
1006 | m_limit = NULL; | |
1007 | } | |
1008 | ||
1009 | /* Bump the iterator. */ | |
1010 | ||
1011 | template<typename Descriptor, template<typename Type> class Allocator> | |
67f58944 TS |
1012 | inline typename hash_table<Descriptor, Allocator>::iterator & |
1013 | hash_table<Descriptor, Allocator>::iterator::operator ++ () | |
bf190e8d | 1014 | { |
65d3284b | 1015 | ++m_slot; |
bf190e8d LC |
1016 | slide (); |
1017 | return *this; | |
1018 | } | |
1019 | ||
bf190e8d LC |
1020 | |
1021 | /* Iterate through the elements of hash_table HTAB, | |
1022 | using hash_table <....>::iterator ITER, | |
3fadf78a | 1023 | storing each element in RESULT, which is of type TYPE. */ |
bf190e8d LC |
1024 | |
1025 | #define FOR_EACH_HASH_TABLE_ELEMENT(HTAB, RESULT, TYPE, ITER) \ | |
1026 | for ((ITER) = (HTAB).begin (); \ | |
84baa4b9 | 1027 | (ITER) != (HTAB).end () ? (RESULT = *(ITER) , true) : false; \ |
bf190e8d LC |
1028 | ++(ITER)) |
1029 | ||
b086d530 TS |
1030 | /* ggc walking routines. */ |
1031 | ||
1032 | template<typename E> | |
1033 | static inline void | |
1034 | gt_ggc_mx (hash_table<E> *h) | |
1035 | { | |
1036 | typedef hash_table<E> table; | |
1037 | ||
1038 | if (!ggc_test_and_set_mark (h->m_entries)) | |
1039 | return; | |
1040 | ||
1041 | for (size_t i = 0; i < h->m_size; i++) | |
1042 | { | |
1043 | if (table::is_empty (h->m_entries[i]) | |
1044 | || table::is_deleted (h->m_entries[i])) | |
1045 | continue; | |
1046 | ||
21faa101 JM |
1047 | /* Use ggc_maxbe_mx so we don't mark right away for cache tables; we'll |
1048 | mark in gt_cleare_cache if appropriate. */ | |
1049 | E::ggc_maybe_mx (h->m_entries[i]); | |
b086d530 TS |
1050 | } |
1051 | } | |
1052 | ||
1053 | template<typename D> | |
1054 | static inline void | |
1055 | hashtab_entry_note_pointers (void *obj, void *h, gt_pointer_operator op, | |
1056 | void *cookie) | |
1057 | { | |
1058 | hash_table<D> *map = static_cast<hash_table<D> *> (h); | |
1059 | gcc_checking_assert (map->m_entries == obj); | |
1060 | for (size_t i = 0; i < map->m_size; i++) | |
1061 | { | |
1062 | typedef hash_table<D> table; | |
1063 | if (table::is_empty (map->m_entries[i]) | |
1064 | || table::is_deleted (map->m_entries[i])) | |
1065 | continue; | |
1066 | ||
1067 | D::pch_nx (map->m_entries[i], op, cookie); | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | template<typename D> | |
1072 | static void | |
1073 | gt_pch_nx (hash_table<D> *h) | |
1074 | { | |
2a22f99c | 1075 | bool success |
4b49af15 TS |
1076 | = gt_pch_note_object (h->m_entries, h, hashtab_entry_note_pointers<D>); |
1077 | gcc_checking_assert (success); | |
b086d530 TS |
1078 | for (size_t i = 0; i < h->m_size; i++) |
1079 | { | |
1080 | if (hash_table<D>::is_empty (h->m_entries[i]) | |
1081 | || hash_table<D>::is_deleted (h->m_entries[i])) | |
1082 | continue; | |
1083 | ||
1084 | D::pch_nx (h->m_entries[i]); | |
1085 | } | |
1086 | } | |
1087 | ||
2a22f99c TS |
1088 | template<typename D> |
1089 | static inline void | |
1090 | gt_pch_nx (hash_table<D> *h, gt_pointer_operator op, void *cookie) | |
1091 | { | |
1092 | op (&h->m_entries, cookie); | |
1093 | } | |
1094 | ||
aebf76a2 TS |
1095 | template<typename H> |
1096 | inline void | |
1097 | gt_cleare_cache (hash_table<H> *h) | |
1098 | { | |
08ec2754 | 1099 | typedef hash_table<H> table; |
aebf76a2 TS |
1100 | if (!h) |
1101 | return; | |
1102 | ||
08ec2754 RS |
1103 | for (typename table::iterator iter = h->begin (); iter != h->end (); ++iter) |
1104 | if (!table::is_empty (*iter) && !table::is_deleted (*iter)) | |
1105 | { | |
1106 | int res = H::keep_cache_entry (*iter); | |
1107 | if (res == 0) | |
1108 | h->clear_slot (&*iter); | |
1109 | else if (res != -1) | |
21faa101 | 1110 | H::ggc_mx (*iter); |
08ec2754 | 1111 | } |
aebf76a2 TS |
1112 | } |
1113 | ||
0823efed | 1114 | #endif /* TYPED_HASHTAB_H */ |