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annotate src/dynarr.c @ 4985:358aa3bb603f
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| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Fri, 05 Feb 2010 12:12:28 -0600 |
| parents | 16112448d484 |
| children | 838630c0734f |
| rev | line source |
|---|---|
| 1318 | 1 /* Support for dynamic arrays. |
| 428 | 2 Copyright (C) 1993 Sun Microsystems, Inc. |
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3 Copyright (C) 2002, 2003, 2004, 2005, 2010 Ben Wing. |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY 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 XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Synched up with: Not in FSF. */ | |
| 23 | |
| 24 /* Written by Ben Wing, December 1993. */ | |
| 25 | |
| 26 /* | |
| 27 | |
| 28 A "dynamic array" is a contiguous array of fixed-size elements where there | |
| 29 is no upper limit (except available memory) on the number of elements in the | |
| 30 array. Because the elements are maintained contiguously, space is used | |
| 31 efficiently (no per-element pointers necessary) and random access to a | |
| 32 particular element is in constant time. At any one point, the block of memory | |
| 33 that holds the array has an upper limit; if this limit is exceeded, the | |
| 34 memory is realloc()ed into a new array that is twice as big. Assuming that | |
| 35 the time to grow the array is on the order of the new size of the array | |
| 36 block, this scheme has a provably constant amortized time (i.e. average | |
| 37 time over all additions). | |
| 38 | |
| 39 When you add elements or retrieve elements, pointers are used. Note that | |
| 40 the element itself (of whatever size it is), and not the pointer to it, | |
| 41 is stored in the array; thus you do not have to allocate any heap memory | |
| 42 on your own. Also, returned pointers are only guaranteed to be valid | |
| 43 until the next operation that changes the length of the array. | |
| 44 | |
| 45 This is a container object. Declare a dynamic array of a specific type | |
| 46 as follows: | |
| 47 | |
| 2367 | 48 typedef struct |
| 49 { | |
| 50 Dynarr_declare (mytype); | |
| 51 } mytype_dynarr; | |
| 428 | 52 |
| 53 Use the following functions/macros: | |
| 54 | |
| 55 void *Dynarr_new(type) | |
| 56 [MACRO] Create a new dynamic-array object, with each element of the | |
| 57 specified type. The return value is cast to (type##_dynarr). | |
| 58 This requires following the convention that types are declared in | |
| 59 such a way that this type concatenation works. In particular, TYPE | |
| 60 must be a symbol, not an arbitrary C type. | |
| 61 | |
| 62 Dynarr_add(d, el) | |
| 63 [MACRO] Add an element to the end of a dynamic array. EL is a pointer | |
| 64 to the element; the element itself is stored in the array, however. | |
| 65 No function call is performed unless the array needs to be resized. | |
| 66 | |
| 67 Dynarr_add_many(d, base, len) | |
| 68 [MACRO] Add LEN elements to the end of the dynamic array. The elements | |
| 771 | 69 should be contiguous in memory, starting at BASE. If BASE if NULL, |
| 70 just make space for the elements; don't actually add them. | |
| 428 | 71 |
| 72 Dynarr_insert_many_at_start(d, base, len) | |
| 73 [MACRO] Append LEN elements to the beginning of the dynamic array. | |
| 74 The elements should be contiguous in memory, starting at BASE. | |
| 771 | 75 If BASE if NULL, just make space for the elements; don't actually |
| 76 add them. | |
| 428 | 77 |
| 78 Dynarr_insert_many(d, base, len, start) | |
| 79 Insert LEN elements to the dynamic array starting at position | |
| 80 START. The elements should be contiguous in memory, starting at BASE. | |
| 771 | 81 If BASE if NULL, just make space for the elements; don't actually |
| 82 add them. | |
| 83 | |
| 84 Dynarr_delete(d, i) | |
| 85 [MACRO] Delete an element from the dynamic array at position I. | |
| 86 | |
| 87 Dynarr_delete_many(d, start, len) | |
| 88 Delete LEN elements from the dynamic array starting at position | |
| 89 START. | |
| 90 | |
| 91 Dynarr_delete_by_pointer(d, p) | |
| 92 [MACRO] Delete an element from the dynamic array at pointer P, | |
| 93 which must point within the block of memory that stores the data. | |
| 94 P should be obtained using Dynarr_atp(). | |
| 428 | 95 |
| 96 int Dynarr_length(d) | |
| 97 [MACRO] Return the number of elements currently in a dynamic array. | |
| 98 | |
| 99 int Dynarr_largest(d) | |
| 100 [MACRO] Return the maximum value that Dynarr_length(d) would | |
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101 ever have returned. This is used esp. in the redisplay code, |
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102 which reuses dynarrs for performance reasons. |
| 428 | 103 |
| 104 type Dynarr_at(d, i) | |
| 105 [MACRO] Return the element at the specified index (no bounds checking | |
| 106 done on the index). The element itself is returned, not a pointer | |
| 107 to it. | |
| 108 | |
| 109 type *Dynarr_atp(d, i) | |
| 110 [MACRO] Return a pointer to the element at the specified index (no | |
| 111 bounds checking done on the index). The pointer may not be valid | |
| 112 after an element is added to or removed from the array. | |
| 113 | |
| 114 Dynarr_reset(d) | |
| 115 [MACRO] Reset the length of a dynamic array to 0. | |
| 116 | |
| 117 Dynarr_free(d) | |
| 118 Destroy a dynamic array and the memory allocated to it. | |
| 119 | |
| 120 Use the following global variable: | |
| 121 | |
| 122 Dynarr_min_size | |
| 440 | 123 Minimum allowable size for a dynamic array when it is resized. |
| 428 | 124 |
| 125 */ | |
| 126 | |
| 127 #include <config.h> | |
| 128 #include "lisp.h" | |
| 129 | |
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130 static const struct memory_description const_Ascbyte_ptr_description_1[] = { |
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131 { XD_ASCII_STRING, 0 }, |
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132 { XD_END } |
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133 }; |
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134 |
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135 const struct sized_memory_description const_Ascbyte_ptr_description = { |
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136 sizeof (const Ascbyte *), |
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137 const_Ascbyte_ptr_description_1 |
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138 }; |
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139 |
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140 static const struct memory_description const_Ascbyte_ptr_dynarr_description_1[] = { |
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141 XD_DYNARR_DESC (const_Ascbyte_ptr_dynarr, &const_Ascbyte_ptr_description), |
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142 { XD_END } |
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143 }; |
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144 |
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145 const struct sized_memory_description const_Ascbyte_ptr_dynarr_description = { |
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146 sizeof (const_Ascbyte_ptr_dynarr), |
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147 const_Ascbyte_ptr_dynarr_description_1 |
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148 }; |
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149 |
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150 |
| 440 | 151 static int Dynarr_min_size = 8; |
| 428 | 152 |
| 153 static void | |
| 3210 | 154 Dynarr_realloc (Dynarr *dy, int new_size) |
| 428 | 155 { |
| 156 if (DUMPEDP (dy->base)) | |
| 157 { | |
| 3293 | 158 void *new_base = malloc (new_size * dy->elsize); |
| 3210 | 159 memcpy (new_base, dy->base, |
| 4967 | 160 (Dynarr_max (dy) < new_size ? Dynarr_max (dy) : new_size) * |
| 161 dy->elsize); | |
| 428 | 162 dy->base = new_base; |
| 163 } | |
| 164 else | |
| 3210 | 165 dy->base = xrealloc (dy->base, new_size * dy->elsize); |
| 428 | 166 } |
| 167 | |
| 168 void * | |
| 169 Dynarr_newf (int elsize) | |
| 170 { | |
| 171 Dynarr *d = xnew_and_zero (Dynarr); | |
| 172 d->elsize = elsize; | |
| 173 | |
| 174 return d; | |
| 175 } | |
| 176 | |
| 3092 | 177 #ifdef NEW_GC |
| 178 DEFINE_LRECORD_IMPLEMENTATION ("dynarr", dynarr, | |
| 179 1, /*dumpable-flag*/ | |
| 180 0, 0, 0, 0, 0, | |
| 181 0, | |
| 182 Dynarr); | |
| 183 | |
| 184 static void | |
| 3210 | 185 Dynarr_lisp_realloc (Dynarr *dy, int new_size) |
| 3092 | 186 { |
| 187 void *new_base = alloc_lrecord_array (dy->elsize, new_size, dy->lisp_imp); | |
| 188 if (dy->base) | |
| 189 memcpy (new_base, dy->base, | |
| 4967 | 190 (Dynarr_max (dy) < new_size ? Dynarr_max (dy) : new_size) * |
| 191 dy->elsize); | |
| 3092 | 192 dy->base = new_base; |
| 193 } | |
| 194 | |
| 195 void * | |
| 196 Dynarr_lisp_newf (int elsize, | |
| 197 const struct lrecord_implementation *dynarr_imp, | |
| 198 const struct lrecord_implementation *imp) | |
| 199 { | |
| 200 Dynarr *d = (Dynarr *) alloc_lrecord (sizeof (Dynarr), dynarr_imp); | |
| 201 d->elsize = elsize; | |
| 202 d->lisp_imp = imp; | |
| 203 | |
| 204 return d; | |
| 205 } | |
| 206 #endif /* not NEW_GC */ | |
| 207 | |
| 428 | 208 void |
| 2367 | 209 Dynarr_resize (void *d, Elemcount size) |
| 428 | 210 { |
| 211 int newsize; | |
| 212 double multiplier; | |
| 1318 | 213 Dynarr *dy = (Dynarr *) Dynarr_verify (d); |
| 428 | 214 |
| 4967 | 215 if (Dynarr_max (dy) <= 8) |
| 428 | 216 multiplier = 2; |
| 217 else | |
| 218 multiplier = 1.5; | |
| 219 | |
| 4967 | 220 for (newsize = Dynarr_max (dy); newsize < size;) |
| 428 | 221 newsize = max (Dynarr_min_size, (int) (multiplier * newsize)); |
| 222 | |
| 223 /* Don't do anything if the array is already big enough. */ | |
| 4967 | 224 if (newsize > Dynarr_max (dy)) |
| 428 | 225 { |
| 3092 | 226 #ifdef NEW_GC |
| 227 if (dy->lisp_imp) | |
| 228 Dynarr_lisp_realloc (dy, newsize); | |
| 229 else | |
| 3210 | 230 Dynarr_realloc (dy, newsize); |
| 3092 | 231 #else /* not NEW_GC */ |
| 3210 | 232 Dynarr_realloc (dy, newsize); |
| 3092 | 233 #endif /* not NEW_GC */ |
| 4967 | 234 dy->max_ = newsize; |
| 428 | 235 } |
| 236 } | |
| 237 | |
| 238 /* Add a number of contiguous elements to the array starting at START. */ | |
| 239 void | |
| 442 | 240 Dynarr_insert_many (void *d, const void *el, int len, int start) |
| 428 | 241 { |
| 4967 | 242 Dynarr *dy = Dynarr_verify_mod (d); |
| 243 | |
| 244 Dynarr_resize_if (dy, len); | |
| 245 | |
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246 /* #### This could conceivably be wrong, if code wants to access stuff |
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247 between len and largest. */ |
| 4967 | 248 structure_checking_assert (start >= 0 && start <= Dynarr_length (dy)); |
| 428 | 249 |
| 4967 | 250 if (start != Dynarr_length (dy)) |
| 428 | 251 { |
| 252 memmove ((char *) dy->base + (start + len)*dy->elsize, | |
| 253 (char *) dy->base + start*dy->elsize, | |
| 4967 | 254 (Dynarr_length (dy) - start)*dy->elsize); |
| 428 | 255 } |
| 4967 | 256 /* Some functions call us with a value of 0 to mean "reserve space but |
| 257 don't write into it" */ | |
| 771 | 258 if (el) |
| 259 memcpy ((char *) dy->base + start*dy->elsize, el, len*dy->elsize); | |
| 428 | 260 |
| 4967 | 261 Dynarr_set_length_1 (dy, Dynarr_length (dy) + len); |
| 262 (void) Dynarr_verify_mod (dy); | |
| 428 | 263 } |
| 264 | |
| 265 void | |
| 266 Dynarr_delete_many (void *d, int start, int len) | |
| 267 { | |
| 4967 | 268 Dynarr *dy = Dynarr_verify_mod (d); |
| 428 | 269 |
| 4967 | 270 structure_checking_assert (start >= 0 && len >= 0 && |
| 271 start + len <= Dynarr_length (dy)); | |
| 272 | |
| 428 | 273 memmove ((char *) dy->base + start*dy->elsize, |
| 274 (char *) dy->base + (start + len)*dy->elsize, | |
| 4967 | 275 (Dynarr_length (dy) - start - len)*dy->elsize); |
| 276 | |
| 277 Dynarr_set_length_1 (dy, Dynarr_length (dy) - len); | |
| 278 (void) Dynarr_verify_mod (dy); | |
| 428 | 279 } |
| 280 | |
| 281 void | |
| 282 Dynarr_free (void *d) | |
| 283 { | |
| 284 Dynarr *dy = (Dynarr *) d; | |
| 285 | |
| 3092 | 286 #ifdef NEW_GC |
| 287 if (dy->base && !DUMPEDP (dy->base)) | |
| 288 { | |
| 4117 | 289 if (!dy->lisp_imp) |
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290 xfree (dy->base); |
| 3092 | 291 } |
| 292 if(!DUMPEDP (dy)) | |
| 293 { | |
| 4117 | 294 if (!dy->lisp_imp) |
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295 xfree (dy); |
| 3092 | 296 } |
| 297 #else /* not NEW_GC */ | |
| 428 | 298 if (dy->base && !DUMPEDP (dy->base)) |
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299 xfree (dy->base); |
| 428 | 300 if(!DUMPEDP (dy)) |
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301 xfree (dy); |
| 3092 | 302 #endif /* not NEW_GC */ |
| 428 | 303 } |
| 304 | |
| 305 #ifdef MEMORY_USAGE_STATS | |
| 306 | |
| 307 /* Return memory usage for Dynarr D. The returned value is the total | |
| 308 amount of bytes actually being used for the Dynarr, including all | |
| 309 overhead. The extra amount of space in the Dynarr that is | |
| 310 allocated beyond what was requested is returned in DYNARR_OVERHEAD | |
| 311 in STATS. The extra amount of space that malloc() allocates beyond | |
| 312 what was requested of it is returned in MALLOC_OVERHEAD in STATS. | |
| 313 See the comment above the definition of this structure. */ | |
| 314 | |
| 665 | 315 Bytecount |
| 428 | 316 Dynarr_memory_usage (void *d, struct overhead_stats *stats) |
| 317 { | |
| 665 | 318 Bytecount total = 0; |
| 428 | 319 Dynarr *dy = (Dynarr *) d; |
| 320 | |
| 321 /* We have to be a bit tricky here because not all of the | |
| 322 memory that malloc() will claim as "requested" was actually | |
| 323 requested. */ | |
| 324 | |
| 325 if (dy->base) | |
| 326 { | |
| 4967 | 327 Bytecount malloc_used = |
| 328 malloced_storage_size (dy->base, dy->elsize * Dynarr_max (dy), 0); | |
| 428 | 329 /* #### This may or may not be correct. Some Dynarrs would |
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330 prefer that we use dy->len instead of dy->largest here. */ |
| 4967 | 331 Bytecount was_requested = dy->elsize * Dynarr_largest (dy); |
| 332 Bytecount dynarr_overhead = | |
| 333 dy->elsize * (Dynarr_max (dy) - Dynarr_largest (dy)); | |
| 428 | 334 |
| 335 total += malloc_used; | |
| 336 stats->was_requested += was_requested; | |
| 337 stats->dynarr_overhead += dynarr_overhead; | |
| 338 /* And the remainder must be malloc overhead. */ | |
| 339 stats->malloc_overhead += | |
| 340 malloc_used - was_requested - dynarr_overhead; | |
| 341 } | |
| 342 | |
| 343 total += malloced_storage_size (d, sizeof (*dy), stats); | |
| 344 | |
| 345 return total; | |
| 346 } | |
| 347 | |
| 348 #endif /* MEMORY_USAGE_STATS */ | |
| 2367 | 349 |
| 350 /* Version of malloc() that will be extremely efficient when allocation | |
| 351 nearly always occurs in LIFO (stack) order. | |
| 352 | |
| 353 #### Perhaps shouldn't be in this file, but where else? */ | |
| 354 | |
| 355 typedef struct | |
| 356 { | |
| 357 Dynarr_declare (char_dynarr *); | |
| 358 } char_dynarr_dynarr; | |
| 359 | |
| 360 char_dynarr_dynarr *stack_like_free_list; | |
| 361 char_dynarr_dynarr *stack_like_in_use_list; | |
| 362 | |
| 363 void * | |
| 364 stack_like_malloc (Bytecount size) | |
| 365 { | |
| 366 char_dynarr *this_one; | |
| 367 if (!stack_like_free_list) | |
| 368 { | |
| 369 stack_like_free_list = Dynarr_new2 (char_dynarr_dynarr, | |
| 370 char_dynarr *); | |
| 371 stack_like_in_use_list = Dynarr_new2 (char_dynarr_dynarr, | |
| 372 char_dynarr *); | |
| 373 } | |
| 374 | |
| 375 if (Dynarr_length (stack_like_free_list) > 0) | |
| 376 this_one = Dynarr_pop (stack_like_free_list); | |
| 377 else | |
| 378 this_one = Dynarr_new (char); | |
| 379 Dynarr_add (stack_like_in_use_list, this_one); | |
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380 Dynarr_reset (this_one); |
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381 Dynarr_add_many (this_one, 0, size); |
| 4967 | 382 return Dynarr_begin (this_one); |
| 2367 | 383 } |
| 384 | |
| 385 void | |
| 386 stack_like_free (void *val) | |
| 387 { | |
| 388 int len = Dynarr_length (stack_like_in_use_list); | |
| 389 assert (len > 0); | |
| 390 /* The vast majority of times, we will be called in a last-in first-out | |
| 391 order, and the item at the end of the list will be the one we're | |
| 392 looking for, so just check for this first and avoid any function | |
| 393 calls. */ | |
| 4967 | 394 if (Dynarr_begin (Dynarr_at (stack_like_in_use_list, len - 1)) == val) |
| 2367 | 395 { |
| 396 char_dynarr *this_one = Dynarr_pop (stack_like_in_use_list); | |
| 397 Dynarr_add (stack_like_free_list, this_one); | |
| 398 } | |
| 399 else | |
| 400 { | |
| 401 /* Find the item and delete it. */ | |
| 402 int i; | |
| 403 assert (len >= 2); | |
| 404 for (i = len - 2; i >= 0; i--) | |
| 4967 | 405 if (Dynarr_begin (Dynarr_at (stack_like_in_use_list, i)) == |
| 2367 | 406 val) |
| 407 { | |
| 408 char_dynarr *this_one = Dynarr_at (stack_like_in_use_list, i); | |
| 409 Dynarr_add (stack_like_free_list, this_one); | |
| 410 Dynarr_delete (stack_like_in_use_list, i); | |
| 411 return; | |
| 412 } | |
| 413 | |
| 2500 | 414 ABORT (); |
| 2367 | 415 } |
| 416 } |