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74ad5c7f KH |
1 | /* This file is no longer automatically generated from libc. */ |
2 | ||
3 | #define _MALLOC_INTERNAL | |
4 | ||
5 | /* The malloc headers and source files from the C library follow here. */ | |
6 | ||
7 | /* Declarations for `malloc' and friends. | |
68c45bf0 | 8 | Copyright 1990, 91, 92, 93, 95, 96, 99 Free Software Foundation, Inc. |
74ad5c7f KH |
9 | Written May 1989 by Mike Haertel. |
10 | ||
11 | This library is free software; you can redistribute it and/or | |
12 | modify it under the terms of the GNU Library General Public License as | |
13 | published by the Free Software Foundation; either version 2 of the | |
14 | License, or (at your option) any later version. | |
15 | ||
16 | This library 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 GNU | |
19 | Library General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU Library General Public | |
22 | License along with this library; see the file COPYING.LIB. If | |
23 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
24 | Cambridge, MA 02139, USA. | |
25 | ||
26 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
27 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
28 | ||
29 | #ifndef _MALLOC_H | |
30 | ||
31 | #define _MALLOC_H 1 | |
32 | ||
33 | #ifdef _MALLOC_INTERNAL | |
34 | ||
35 | #ifdef HAVE_CONFIG_H | |
36 | #include <config.h> | |
37 | #endif | |
38 | ||
9e67b01b DL |
39 | #if defined __cplusplus || (defined (__STDC__) && __STDC__) || \ |
40 | defined STDC_HEADERS || defined PROTOTYPES | |
0a27e8ed RS |
41 | #undef PP |
42 | #define PP(args) args | |
74ad5c7f KH |
43 | #undef __ptr_t |
44 | #define __ptr_t void * | |
45 | #else /* Not C++ or ANSI C. */ | |
0a27e8ed RS |
46 | #undef PP |
47 | #define PP(args) () | |
74ad5c7f KH |
48 | #undef __ptr_t |
49 | #define __ptr_t char * | |
50 | #endif /* C++ or ANSI C. */ | |
51 | ||
52 | #if defined(_LIBC) || defined(STDC_HEADERS) || defined(USG) | |
53 | #include <string.h> | |
54 | #else | |
55 | #ifndef memset | |
56 | #define memset(s, zero, n) bzero ((s), (n)) | |
57 | #endif | |
58 | #ifndef memcpy | |
59 | #define memcpy(d, s, n) bcopy ((s), (d), (n)) | |
60 | #endif | |
61 | #endif | |
62 | ||
ca9c0567 | 63 | #ifdef HAVE_LIMITS_H |
74ad5c7f | 64 | #include <limits.h> |
ca9c0567 | 65 | #endif |
74ad5c7f KH |
66 | #ifndef CHAR_BIT |
67 | #define CHAR_BIT 8 | |
68 | #endif | |
74ad5c7f KH |
69 | |
70 | #ifdef HAVE_UNISTD_H | |
71 | #include <unistd.h> | |
72 | #endif | |
73 | ||
74 | #endif /* _MALLOC_INTERNAL. */ | |
75 | ||
76 | ||
77 | #ifdef __cplusplus | |
78 | extern "C" | |
79 | { | |
80 | #endif | |
81 | ||
ca9c0567 | 82 | #ifdef STDC_HEADERS |
74ad5c7f KH |
83 | #include <stddef.h> |
84 | #define __malloc_size_t size_t | |
85 | #define __malloc_ptrdiff_t ptrdiff_t | |
86 | #else | |
87 | #define __malloc_size_t unsigned int | |
88 | #define __malloc_ptrdiff_t int | |
89 | #endif | |
90 | ||
91 | #ifndef NULL | |
92 | #define NULL 0 | |
93 | #endif | |
94 | ||
ca9c0567 PE |
95 | #ifndef FREE_RETURN_TYPE |
96 | #define FREE_RETURN_TYPE void | |
97 | #endif | |
98 | ||
74ad5c7f KH |
99 | |
100 | /* Allocate SIZE bytes of memory. */ | |
0a27e8ed | 101 | extern __ptr_t malloc PP ((__malloc_size_t __size)); |
74ad5c7f KH |
102 | /* Re-allocate the previously allocated block |
103 | in __ptr_t, making the new block SIZE bytes long. */ | |
0a27e8ed | 104 | extern __ptr_t realloc PP ((__ptr_t __ptr, __malloc_size_t __size)); |
74ad5c7f | 105 | /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */ |
0a27e8ed | 106 | extern __ptr_t calloc PP ((__malloc_size_t __nmemb, __malloc_size_t __size)); |
74ad5c7f | 107 | /* Free a block allocated by `malloc', `realloc' or `calloc'. */ |
ca9c0567 | 108 | extern FREE_RETURN_TYPE free PP ((__ptr_t __ptr)); |
74ad5c7f KH |
109 | |
110 | /* Allocate SIZE bytes allocated to ALIGNMENT bytes. */ | |
111 | #if ! (defined (_MALLOC_INTERNAL) && __DJGPP__ - 0 == 1) /* Avoid conflict. */ | |
0a27e8ed RS |
112 | extern __ptr_t memalign PP ((__malloc_size_t __alignment, |
113 | __malloc_size_t __size)); | |
74ad5c7f KH |
114 | #endif |
115 | ||
116 | /* Allocate SIZE bytes on a page boundary. */ | |
117 | #if ! (defined (_MALLOC_INTERNAL) && defined (GMALLOC_INHIBIT_VALLOC)) | |
0a27e8ed | 118 | extern __ptr_t valloc PP ((__malloc_size_t __size)); |
74ad5c7f KH |
119 | #endif |
120 | ||
121 | ||
122 | #ifdef _MALLOC_INTERNAL | |
123 | ||
124 | /* The allocator divides the heap into blocks of fixed size; large | |
125 | requests receive one or more whole blocks, and small requests | |
126 | receive a fragment of a block. Fragment sizes are powers of two, | |
127 | and all fragments of a block are the same size. When all the | |
128 | fragments in a block have been freed, the block itself is freed. */ | |
129 | #define INT_BIT (CHAR_BIT * sizeof(int)) | |
130 | #define BLOCKLOG (INT_BIT > 16 ? 12 : 9) | |
131 | #define BLOCKSIZE (1 << BLOCKLOG) | |
132 | #define BLOCKIFY(SIZE) (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE) | |
133 | ||
134 | /* Determine the amount of memory spanned by the initial heap table | |
135 | (not an absolute limit). */ | |
136 | #define HEAP (INT_BIT > 16 ? 4194304 : 65536) | |
137 | ||
138 | /* Number of contiguous free blocks allowed to build up at the end of | |
139 | memory before they will be returned to the system. */ | |
140 | #define FINAL_FREE_BLOCKS 8 | |
141 | ||
142 | /* Data structure giving per-block information. */ | |
143 | typedef union | |
144 | { | |
145 | /* Heap information for a busy block. */ | |
146 | struct | |
147 | { | |
148 | /* Zero for a large (multiblock) object, or positive giving the | |
149 | logarithm to the base two of the fragment size. */ | |
150 | int type; | |
151 | union | |
152 | { | |
153 | struct | |
154 | { | |
155 | __malloc_size_t nfree; /* Free frags in a fragmented block. */ | |
156 | __malloc_size_t first; /* First free fragment of the block. */ | |
157 | } frag; | |
158 | /* For a large object, in its first block, this has the number | |
159 | of blocks in the object. In the other blocks, this has a | |
160 | negative number which says how far back the first block is. */ | |
161 | __malloc_ptrdiff_t size; | |
162 | } info; | |
163 | } busy; | |
164 | /* Heap information for a free block | |
165 | (that may be the first of a free cluster). */ | |
166 | struct | |
167 | { | |
168 | __malloc_size_t size; /* Size (in blocks) of a free cluster. */ | |
169 | __malloc_size_t next; /* Index of next free cluster. */ | |
170 | __malloc_size_t prev; /* Index of previous free cluster. */ | |
171 | } free; | |
172 | } malloc_info; | |
173 | ||
174 | /* Pointer to first block of the heap. */ | |
175 | extern char *_heapbase; | |
176 | ||
177 | /* Table indexed by block number giving per-block information. */ | |
178 | extern malloc_info *_heapinfo; | |
179 | ||
180 | /* Address to block number and vice versa. */ | |
181 | #define BLOCK(A) (((char *) (A) - _heapbase) / BLOCKSIZE + 1) | |
182 | #define ADDRESS(B) ((__ptr_t) (((B) - 1) * BLOCKSIZE + _heapbase)) | |
183 | ||
184 | /* Current search index for the heap table. */ | |
185 | extern __malloc_size_t _heapindex; | |
186 | ||
187 | /* Limit of valid info table indices. */ | |
188 | extern __malloc_size_t _heaplimit; | |
189 | ||
190 | /* Doubly linked lists of free fragments. */ | |
191 | struct list | |
192 | { | |
193 | struct list *next; | |
194 | struct list *prev; | |
195 | }; | |
196 | ||
197 | /* Free list headers for each fragment size. */ | |
198 | extern struct list _fraghead[]; | |
199 | ||
200 | /* List of blocks allocated with `memalign' (or `valloc'). */ | |
201 | struct alignlist | |
202 | { | |
203 | struct alignlist *next; | |
204 | __ptr_t aligned; /* The address that memaligned returned. */ | |
205 | __ptr_t exact; /* The address that malloc returned. */ | |
206 | }; | |
207 | extern struct alignlist *_aligned_blocks; | |
208 | ||
209 | /* Instrumentation. */ | |
210 | extern __malloc_size_t _chunks_used; | |
211 | extern __malloc_size_t _bytes_used; | |
212 | extern __malloc_size_t _chunks_free; | |
213 | extern __malloc_size_t _bytes_free; | |
214 | ||
215 | /* Internal versions of `malloc', `realloc', and `free' | |
216 | used when these functions need to call each other. | |
217 | They are the same but don't call the hooks. */ | |
0a27e8ed RS |
218 | extern __ptr_t _malloc_internal PP ((__malloc_size_t __size)); |
219 | extern __ptr_t _realloc_internal PP ((__ptr_t __ptr, __malloc_size_t __size)); | |
220 | extern void _free_internal PP ((__ptr_t __ptr)); | |
74ad5c7f KH |
221 | |
222 | #endif /* _MALLOC_INTERNAL. */ | |
223 | ||
224 | /* Given an address in the middle of a malloc'd object, | |
225 | return the address of the beginning of the object. */ | |
0a27e8ed | 226 | extern __ptr_t malloc_find_object_address PP ((__ptr_t __ptr)); |
74ad5c7f KH |
227 | |
228 | /* Underlying allocation function; successive calls should | |
229 | return contiguous pieces of memory. */ | |
0a27e8ed | 230 | extern __ptr_t (*__morecore) PP ((__malloc_ptrdiff_t __size)); |
74ad5c7f KH |
231 | |
232 | /* Default value of `__morecore'. */ | |
0a27e8ed | 233 | extern __ptr_t __default_morecore PP ((__malloc_ptrdiff_t __size)); |
74ad5c7f KH |
234 | |
235 | /* If not NULL, this function is called after each time | |
236 | `__morecore' is called to increase the data size. */ | |
0a27e8ed | 237 | extern void (*__after_morecore_hook) PP ((void)); |
74ad5c7f KH |
238 | |
239 | /* Number of extra blocks to get each time we ask for more core. | |
240 | This reduces the frequency of calling `(*__morecore)'. */ | |
241 | extern __malloc_size_t __malloc_extra_blocks; | |
242 | ||
243 | /* Nonzero if `malloc' has been called and done its initialization. */ | |
244 | extern int __malloc_initialized; | |
245 | /* Function called to initialize malloc data structures. */ | |
0a27e8ed | 246 | extern int __malloc_initialize PP ((void)); |
74ad5c7f KH |
247 | |
248 | /* Hooks for debugging versions. */ | |
0a27e8ed RS |
249 | extern void (*__malloc_initialize_hook) PP ((void)); |
250 | extern void (*__free_hook) PP ((__ptr_t __ptr)); | |
251 | extern __ptr_t (*__malloc_hook) PP ((__malloc_size_t __size)); | |
252 | extern __ptr_t (*__realloc_hook) PP ((__ptr_t __ptr, __malloc_size_t __size)); | |
253 | extern __ptr_t (*__memalign_hook) PP ((__malloc_size_t __size, | |
254 | __malloc_size_t __alignment)); | |
74ad5c7f KH |
255 | |
256 | /* Return values for `mprobe': these are the kinds of inconsistencies that | |
257 | `mcheck' enables detection of. */ | |
258 | enum mcheck_status | |
259 | { | |
260 | MCHECK_DISABLED = -1, /* Consistency checking is not turned on. */ | |
261 | MCHECK_OK, /* Block is fine. */ | |
262 | MCHECK_FREE, /* Block freed twice. */ | |
263 | MCHECK_HEAD, /* Memory before the block was clobbered. */ | |
264 | MCHECK_TAIL /* Memory after the block was clobbered. */ | |
265 | }; | |
266 | ||
267 | /* Activate a standard collection of debugging hooks. This must be called | |
268 | before `malloc' is ever called. ABORTFUNC is called with an error code | |
269 | (see enum above) when an inconsistency is detected. If ABORTFUNC is | |
270 | null, the standard function prints on stderr and then calls `abort'. */ | |
0a27e8ed | 271 | extern int mcheck PP ((void (*__abortfunc) PP ((enum mcheck_status)))); |
74ad5c7f KH |
272 | |
273 | /* Check for aberrations in a particular malloc'd block. You must have | |
274 | called `mcheck' already. These are the same checks that `mcheck' does | |
275 | when you free or reallocate a block. */ | |
0a27e8ed | 276 | extern enum mcheck_status mprobe PP ((__ptr_t __ptr)); |
74ad5c7f KH |
277 | |
278 | /* Activate a standard collection of tracing hooks. */ | |
0a27e8ed RS |
279 | extern void mtrace PP ((void)); |
280 | extern void muntrace PP ((void)); | |
74ad5c7f KH |
281 | |
282 | /* Statistics available to the user. */ | |
283 | struct mstats | |
284 | { | |
285 | __malloc_size_t bytes_total; /* Total size of the heap. */ | |
286 | __malloc_size_t chunks_used; /* Chunks allocated by the user. */ | |
287 | __malloc_size_t bytes_used; /* Byte total of user-allocated chunks. */ | |
288 | __malloc_size_t chunks_free; /* Chunks in the free list. */ | |
289 | __malloc_size_t bytes_free; /* Byte total of chunks in the free list. */ | |
290 | }; | |
291 | ||
292 | /* Pick up the current statistics. */ | |
0a27e8ed | 293 | extern struct mstats mstats PP ((void)); |
74ad5c7f KH |
294 | |
295 | /* Call WARNFUN with a warning message when memory usage is high. */ | |
0a27e8ed RS |
296 | extern void memory_warnings PP ((__ptr_t __start, |
297 | void (*__warnfun) PP ((const char *)))); | |
74ad5c7f KH |
298 | |
299 | ||
300 | /* Relocating allocator. */ | |
301 | ||
302 | /* Allocate SIZE bytes, and store the address in *HANDLEPTR. */ | |
0a27e8ed | 303 | extern __ptr_t r_alloc PP ((__ptr_t *__handleptr, __malloc_size_t __size)); |
74ad5c7f KH |
304 | |
305 | /* Free the storage allocated in HANDLEPTR. */ | |
0a27e8ed | 306 | extern void r_alloc_free PP ((__ptr_t *__handleptr)); |
74ad5c7f KH |
307 | |
308 | /* Adjust the block at HANDLEPTR to be SIZE bytes long. */ | |
0a27e8ed | 309 | extern __ptr_t r_re_alloc PP ((__ptr_t *__handleptr, __malloc_size_t __size)); |
74ad5c7f KH |
310 | |
311 | ||
312 | #ifdef __cplusplus | |
313 | } | |
314 | #endif | |
315 | ||
316 | #endif /* malloc.h */ | |
317 | /* Memory allocator `malloc'. | |
318 | Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
319 | Written May 1989 by Mike Haertel. | |
320 | ||
321 | This library is free software; you can redistribute it and/or | |
322 | modify it under the terms of the GNU Library General Public License as | |
323 | published by the Free Software Foundation; either version 2 of the | |
324 | License, or (at your option) any later version. | |
325 | ||
326 | This library is distributed in the hope that it will be useful, | |
327 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
328 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
329 | Library General Public License for more details. | |
330 | ||
331 | You should have received a copy of the GNU Library General Public | |
332 | License along with this library; see the file COPYING.LIB. If | |
333 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
334 | Cambridge, MA 02139, USA. | |
335 | ||
336 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
337 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
338 | ||
339 | #ifndef _MALLOC_INTERNAL | |
340 | #define _MALLOC_INTERNAL | |
341 | #include <malloc.h> | |
342 | #endif | |
343 | #include <errno.h> | |
344 | ||
345 | /* How to really get more memory. */ | |
0a27e8ed | 346 | __ptr_t (*__morecore) PP ((ptrdiff_t __size)) = __default_morecore; |
74ad5c7f KH |
347 | |
348 | /* Debugging hook for `malloc'. */ | |
0a27e8ed | 349 | __ptr_t (*__malloc_hook) PP ((__malloc_size_t __size)); |
74ad5c7f KH |
350 | |
351 | /* Pointer to the base of the first block. */ | |
352 | char *_heapbase; | |
353 | ||
354 | /* Block information table. Allocated with align/__free (not malloc/free). */ | |
355 | malloc_info *_heapinfo; | |
356 | ||
357 | /* Number of info entries. */ | |
358 | static __malloc_size_t heapsize; | |
359 | ||
360 | /* Search index in the info table. */ | |
361 | __malloc_size_t _heapindex; | |
362 | ||
363 | /* Limit of valid info table indices. */ | |
364 | __malloc_size_t _heaplimit; | |
365 | ||
366 | /* Free lists for each fragment size. */ | |
367 | struct list _fraghead[BLOCKLOG]; | |
368 | ||
369 | /* Instrumentation. */ | |
370 | __malloc_size_t _chunks_used; | |
371 | __malloc_size_t _bytes_used; | |
372 | __malloc_size_t _chunks_free; | |
373 | __malloc_size_t _bytes_free; | |
374 | ||
375 | /* Are you experienced? */ | |
376 | int __malloc_initialized; | |
377 | ||
378 | __malloc_size_t __malloc_extra_blocks; | |
379 | ||
0a27e8ed RS |
380 | void (*__malloc_initialize_hook) PP ((void)); |
381 | void (*__after_morecore_hook) PP ((void)); | |
74ad5c7f | 382 | |
5dcab13e GM |
383 | #if defined GC_MALLOC_CHECK && defined GC_PROTECT_MALLOC_STATE |
384 | ||
385 | /* Some code for hunting a bug writing into _heapinfo. | |
386 | ||
387 | Call this macro with argument PROT non-zero to protect internal | |
388 | malloc state against writing to it, call it with a zero argument to | |
389 | make it readable and writable. | |
390 | ||
391 | Note that this only works if BLOCKSIZE == page size, which is | |
392 | the case on the i386. */ | |
393 | ||
394 | #include <sys/types.h> | |
395 | #include <sys/mman.h> | |
396 | ||
397 | static int state_protected_p; | |
398 | static __malloc_size_t last_state_size; | |
399 | static malloc_info *last_heapinfo; | |
400 | ||
401 | void | |
402 | protect_malloc_state (protect_p) | |
403 | int protect_p; | |
404 | { | |
405 | /* If _heapinfo has been relocated, make sure its old location | |
406 | isn't left read-only; it will be reused by malloc. */ | |
407 | if (_heapinfo != last_heapinfo | |
408 | && last_heapinfo | |
409 | && state_protected_p) | |
410 | mprotect (last_heapinfo, last_state_size, PROT_READ | PROT_WRITE); | |
411 | ||
412 | last_state_size = _heaplimit * sizeof *_heapinfo; | |
413 | last_heapinfo = _heapinfo; | |
414 | ||
415 | if (protect_p != state_protected_p) | |
416 | { | |
417 | state_protected_p = protect_p; | |
418 | if (mprotect (_heapinfo, last_state_size, | |
419 | protect_p ? PROT_READ : PROT_READ | PROT_WRITE) != 0) | |
420 | abort (); | |
421 | } | |
422 | } | |
423 | ||
424 | #define PROTECT_MALLOC_STATE(PROT) protect_malloc_state(PROT) | |
425 | ||
426 | #else | |
427 | #define PROTECT_MALLOC_STATE(PROT) /* empty */ | |
428 | #endif | |
429 | ||
74ad5c7f KH |
430 | |
431 | /* Aligned allocation. */ | |
0a27e8ed | 432 | static __ptr_t align PP ((__malloc_size_t)); |
74ad5c7f KH |
433 | static __ptr_t |
434 | align (size) | |
435 | __malloc_size_t size; | |
436 | { | |
437 | __ptr_t result; | |
438 | unsigned long int adj; | |
439 | ||
440 | result = (*__morecore) (size); | |
441 | adj = (unsigned long int) ((unsigned long int) ((char *) result - | |
442 | (char *) NULL)) % BLOCKSIZE; | |
443 | if (adj != 0) | |
444 | { | |
445 | __ptr_t new; | |
446 | adj = BLOCKSIZE - adj; | |
447 | new = (*__morecore) (adj); | |
448 | result = (char *) result + adj; | |
449 | } | |
450 | ||
451 | if (__after_morecore_hook) | |
452 | (*__after_morecore_hook) (); | |
453 | ||
454 | return result; | |
455 | } | |
456 | ||
457 | /* Get SIZE bytes, if we can get them starting at END. | |
458 | Return the address of the space we got. | |
459 | If we cannot get space at END, fail and return 0. */ | |
0a27e8ed | 460 | static __ptr_t get_contiguous_space PP ((__malloc_ptrdiff_t, __ptr_t)); |
74ad5c7f KH |
461 | static __ptr_t |
462 | get_contiguous_space (size, position) | |
463 | __malloc_ptrdiff_t size; | |
464 | __ptr_t position; | |
465 | { | |
466 | __ptr_t before; | |
467 | __ptr_t after; | |
468 | ||
469 | before = (*__morecore) (0); | |
470 | /* If we can tell in advance that the break is at the wrong place, | |
471 | fail now. */ | |
472 | if (before != position) | |
473 | return 0; | |
474 | ||
475 | /* Allocate SIZE bytes and get the address of them. */ | |
476 | after = (*__morecore) (size); | |
477 | if (!after) | |
478 | return 0; | |
479 | ||
480 | /* It was not contiguous--reject it. */ | |
481 | if (after != position) | |
482 | { | |
483 | (*__morecore) (- size); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | return after; | |
488 | } | |
489 | ||
490 | ||
491 | /* This is called when `_heapinfo' and `heapsize' have just | |
492 | been set to describe a new info table. Set up the table | |
493 | to describe itself and account for it in the statistics. */ | |
0a27e8ed | 494 | static void register_heapinfo PP ((void)); |
74ad5c7f KH |
495 | #ifdef __GNUC__ |
496 | __inline__ | |
497 | #endif | |
498 | static void | |
499 | register_heapinfo () | |
500 | { | |
501 | __malloc_size_t block, blocks; | |
502 | ||
503 | block = BLOCK (_heapinfo); | |
504 | blocks = BLOCKIFY (heapsize * sizeof (malloc_info)); | |
505 | ||
506 | /* Account for the _heapinfo block itself in the statistics. */ | |
507 | _bytes_used += blocks * BLOCKSIZE; | |
508 | ++_chunks_used; | |
509 | ||
510 | /* Describe the heapinfo block itself in the heapinfo. */ | |
511 | _heapinfo[block].busy.type = 0; | |
512 | _heapinfo[block].busy.info.size = blocks; | |
513 | /* Leave back-pointers for malloc_find_address. */ | |
514 | while (--blocks > 0) | |
515 | _heapinfo[block + blocks].busy.info.size = -blocks; | |
516 | } | |
517 | ||
518 | /* Set everything up and remember that we have. */ | |
519 | int | |
520 | __malloc_initialize () | |
521 | { | |
522 | if (__malloc_initialized) | |
523 | return 0; | |
524 | ||
525 | if (__malloc_initialize_hook) | |
526 | (*__malloc_initialize_hook) (); | |
527 | ||
528 | heapsize = HEAP / BLOCKSIZE; | |
529 | _heapinfo = (malloc_info *) align (heapsize * sizeof (malloc_info)); | |
530 | if (_heapinfo == NULL) | |
531 | return 0; | |
532 | memset (_heapinfo, 0, heapsize * sizeof (malloc_info)); | |
533 | _heapinfo[0].free.size = 0; | |
534 | _heapinfo[0].free.next = _heapinfo[0].free.prev = 0; | |
535 | _heapindex = 0; | |
536 | _heapbase = (char *) _heapinfo; | |
537 | _heaplimit = BLOCK (_heapbase + heapsize * sizeof (malloc_info)); | |
538 | ||
539 | register_heapinfo (); | |
540 | ||
541 | __malloc_initialized = 1; | |
5dcab13e | 542 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
543 | return 1; |
544 | } | |
545 | ||
546 | static int morecore_recursing; | |
547 | ||
548 | /* Get neatly aligned memory, initializing or | |
549 | growing the heap info table as necessary. */ | |
0a27e8ed | 550 | static __ptr_t morecore PP ((__malloc_size_t)); |
74ad5c7f KH |
551 | static __ptr_t |
552 | morecore (size) | |
553 | __malloc_size_t size; | |
554 | { | |
555 | __ptr_t result; | |
556 | malloc_info *newinfo, *oldinfo; | |
557 | __malloc_size_t newsize; | |
558 | ||
559 | if (morecore_recursing) | |
560 | /* Avoid recursion. The caller will know how to handle a null return. */ | |
561 | return NULL; | |
562 | ||
563 | result = align (size); | |
564 | if (result == NULL) | |
565 | return NULL; | |
566 | ||
5dcab13e GM |
567 | PROTECT_MALLOC_STATE (0); |
568 | ||
74ad5c7f KH |
569 | /* Check if we need to grow the info table. */ |
570 | if ((__malloc_size_t) BLOCK ((char *) result + size) > heapsize) | |
571 | { | |
572 | /* Calculate the new _heapinfo table size. We do not account for the | |
573 | added blocks in the table itself, as we hope to place them in | |
574 | existing free space, which is already covered by part of the | |
575 | existing table. */ | |
576 | newsize = heapsize; | |
577 | do | |
578 | newsize *= 2; | |
579 | while ((__malloc_size_t) BLOCK ((char *) result + size) > newsize); | |
580 | ||
581 | /* We must not reuse existing core for the new info table when called | |
582 | from realloc in the case of growing a large block, because the | |
583 | block being grown is momentarily marked as free. In this case | |
584 | _heaplimit is zero so we know not to reuse space for internal | |
585 | allocation. */ | |
586 | if (_heaplimit != 0) | |
587 | { | |
588 | /* First try to allocate the new info table in core we already | |
589 | have, in the usual way using realloc. If realloc cannot | |
590 | extend it in place or relocate it to existing sufficient core, | |
591 | we will get called again, and the code above will notice the | |
592 | `morecore_recursing' flag and return null. */ | |
593 | int save = errno; /* Don't want to clobber errno with ENOMEM. */ | |
594 | morecore_recursing = 1; | |
595 | newinfo = (malloc_info *) _realloc_internal | |
596 | (_heapinfo, newsize * sizeof (malloc_info)); | |
597 | morecore_recursing = 0; | |
598 | if (newinfo == NULL) | |
599 | errno = save; | |
600 | else | |
601 | { | |
602 | /* We found some space in core, and realloc has put the old | |
603 | table's blocks on the free list. Now zero the new part | |
604 | of the table and install the new table location. */ | |
605 | memset (&newinfo[heapsize], 0, | |
606 | (newsize - heapsize) * sizeof (malloc_info)); | |
607 | _heapinfo = newinfo; | |
608 | heapsize = newsize; | |
609 | goto got_heap; | |
610 | } | |
611 | } | |
612 | ||
613 | /* Allocate new space for the malloc info table. */ | |
614 | while (1) | |
615 | { | |
616 | newinfo = (malloc_info *) align (newsize * sizeof (malloc_info)); | |
617 | ||
618 | /* Did it fail? */ | |
619 | if (newinfo == NULL) | |
620 | { | |
621 | (*__morecore) (-size); | |
622 | return NULL; | |
623 | } | |
624 | ||
625 | /* Is it big enough to record status for its own space? | |
626 | If so, we win. */ | |
627 | if ((__malloc_size_t) BLOCK ((char *) newinfo | |
628 | + newsize * sizeof (malloc_info)) | |
629 | < newsize) | |
630 | break; | |
631 | ||
632 | /* Must try again. First give back most of what we just got. */ | |
633 | (*__morecore) (- newsize * sizeof (malloc_info)); | |
634 | newsize *= 2; | |
635 | } | |
636 | ||
637 | /* Copy the old table to the beginning of the new, | |
638 | and zero the rest of the new table. */ | |
639 | memcpy (newinfo, _heapinfo, heapsize * sizeof (malloc_info)); | |
640 | memset (&newinfo[heapsize], 0, | |
641 | (newsize - heapsize) * sizeof (malloc_info)); | |
642 | oldinfo = _heapinfo; | |
643 | _heapinfo = newinfo; | |
644 | heapsize = newsize; | |
645 | ||
646 | register_heapinfo (); | |
647 | ||
648 | /* Reset _heaplimit so _free_internal never decides | |
649 | it can relocate or resize the info table. */ | |
650 | _heaplimit = 0; | |
651 | _free_internal (oldinfo); | |
5dcab13e | 652 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
653 | |
654 | /* The new heap limit includes the new table just allocated. */ | |
655 | _heaplimit = BLOCK ((char *) newinfo + heapsize * sizeof (malloc_info)); | |
656 | return result; | |
657 | } | |
658 | ||
659 | got_heap: | |
660 | _heaplimit = BLOCK ((char *) result + size); | |
661 | return result; | |
662 | } | |
663 | ||
664 | /* Allocate memory from the heap. */ | |
665 | __ptr_t | |
666 | _malloc_internal (size) | |
667 | __malloc_size_t size; | |
668 | { | |
669 | __ptr_t result; | |
670 | __malloc_size_t block, blocks, lastblocks, start; | |
671 | register __malloc_size_t i; | |
672 | struct list *next; | |
673 | ||
674 | /* ANSI C allows `malloc (0)' to either return NULL, or to return a | |
675 | valid address you can realloc and free (though not dereference). | |
676 | ||
677 | It turns out that some extant code (sunrpc, at least Ultrix's version) | |
678 | expects `malloc (0)' to return non-NULL and breaks otherwise. | |
679 | Be compatible. */ | |
680 | ||
681 | #if 0 | |
682 | if (size == 0) | |
683 | return NULL; | |
684 | #endif | |
685 | ||
5dcab13e GM |
686 | PROTECT_MALLOC_STATE (0); |
687 | ||
74ad5c7f KH |
688 | if (size < sizeof (struct list)) |
689 | size = sizeof (struct list); | |
690 | ||
691 | #ifdef SUNOS_LOCALTIME_BUG | |
692 | if (size < 16) | |
693 | size = 16; | |
694 | #endif | |
695 | ||
696 | /* Determine the allocation policy based on the request size. */ | |
697 | if (size <= BLOCKSIZE / 2) | |
698 | { | |
699 | /* Small allocation to receive a fragment of a block. | |
700 | Determine the logarithm to base two of the fragment size. */ | |
701 | register __malloc_size_t log = 1; | |
702 | --size; | |
703 | while ((size /= 2) != 0) | |
704 | ++log; | |
705 | ||
706 | /* Look in the fragment lists for a | |
707 | free fragment of the desired size. */ | |
708 | next = _fraghead[log].next; | |
709 | if (next != NULL) | |
710 | { | |
711 | /* There are free fragments of this size. | |
712 | Pop a fragment out of the fragment list and return it. | |
713 | Update the block's nfree and first counters. */ | |
714 | result = (__ptr_t) next; | |
715 | next->prev->next = next->next; | |
716 | if (next->next != NULL) | |
717 | next->next->prev = next->prev; | |
718 | block = BLOCK (result); | |
719 | if (--_heapinfo[block].busy.info.frag.nfree != 0) | |
720 | _heapinfo[block].busy.info.frag.first = (unsigned long int) | |
721 | ((unsigned long int) ((char *) next->next - (char *) NULL) | |
722 | % BLOCKSIZE) >> log; | |
723 | ||
724 | /* Update the statistics. */ | |
725 | ++_chunks_used; | |
726 | _bytes_used += 1 << log; | |
727 | --_chunks_free; | |
728 | _bytes_free -= 1 << log; | |
729 | } | |
730 | else | |
731 | { | |
732 | /* No free fragments of the desired size, so get a new block | |
733 | and break it into fragments, returning the first. */ | |
8094989b GM |
734 | #ifdef GC_MALLOC_CHECK |
735 | result = _malloc_internal (BLOCKSIZE); | |
5dcab13e | 736 | PROTECT_MALLOC_STATE (0); |
8094989b | 737 | #else |
74ad5c7f | 738 | result = malloc (BLOCKSIZE); |
8094989b | 739 | #endif |
74ad5c7f | 740 | if (result == NULL) |
5dcab13e GM |
741 | { |
742 | PROTECT_MALLOC_STATE (1); | |
743 | return NULL; | |
744 | } | |
74ad5c7f KH |
745 | |
746 | /* Link all fragments but the first into the free list. */ | |
747 | next = (struct list *) ((char *) result + (1 << log)); | |
748 | next->next = NULL; | |
749 | next->prev = &_fraghead[log]; | |
750 | _fraghead[log].next = next; | |
751 | ||
752 | for (i = 2; i < (__malloc_size_t) (BLOCKSIZE >> log); ++i) | |
753 | { | |
754 | next = (struct list *) ((char *) result + (i << log)); | |
755 | next->next = _fraghead[log].next; | |
756 | next->prev = &_fraghead[log]; | |
757 | next->prev->next = next; | |
758 | next->next->prev = next; | |
759 | } | |
760 | ||
761 | /* Initialize the nfree and first counters for this block. */ | |
762 | block = BLOCK (result); | |
763 | _heapinfo[block].busy.type = log; | |
764 | _heapinfo[block].busy.info.frag.nfree = i - 1; | |
765 | _heapinfo[block].busy.info.frag.first = i - 1; | |
766 | ||
767 | _chunks_free += (BLOCKSIZE >> log) - 1; | |
768 | _bytes_free += BLOCKSIZE - (1 << log); | |
769 | _bytes_used -= BLOCKSIZE - (1 << log); | |
770 | } | |
771 | } | |
772 | else | |
773 | { | |
774 | /* Large allocation to receive one or more blocks. | |
775 | Search the free list in a circle starting at the last place visited. | |
776 | If we loop completely around without finding a large enough | |
777 | space we will have to get more memory from the system. */ | |
778 | blocks = BLOCKIFY (size); | |
779 | start = block = _heapindex; | |
780 | while (_heapinfo[block].free.size < blocks) | |
781 | { | |
782 | block = _heapinfo[block].free.next; | |
783 | if (block == start) | |
784 | { | |
785 | /* Need to get more from the system. Get a little extra. */ | |
786 | __malloc_size_t wantblocks = blocks + __malloc_extra_blocks; | |
787 | block = _heapinfo[0].free.prev; | |
788 | lastblocks = _heapinfo[block].free.size; | |
789 | /* Check to see if the new core will be contiguous with the | |
790 | final free block; if so we don't need to get as much. */ | |
791 | if (_heaplimit != 0 && block + lastblocks == _heaplimit && | |
792 | /* We can't do this if we will have to make the heap info | |
793 | table bigger to accomodate the new space. */ | |
794 | block + wantblocks <= heapsize && | |
795 | get_contiguous_space ((wantblocks - lastblocks) * BLOCKSIZE, | |
796 | ADDRESS (block + lastblocks))) | |
797 | { | |
798 | /* We got it contiguously. Which block we are extending | |
799 | (the `final free block' referred to above) might have | |
800 | changed, if it got combined with a freed info table. */ | |
801 | block = _heapinfo[0].free.prev; | |
802 | _heapinfo[block].free.size += (wantblocks - lastblocks); | |
803 | _bytes_free += (wantblocks - lastblocks) * BLOCKSIZE; | |
804 | _heaplimit += wantblocks - lastblocks; | |
805 | continue; | |
806 | } | |
807 | result = morecore (wantblocks * BLOCKSIZE); | |
808 | if (result == NULL) | |
809 | return NULL; | |
810 | block = BLOCK (result); | |
811 | /* Put the new block at the end of the free list. */ | |
812 | _heapinfo[block].free.size = wantblocks; | |
813 | _heapinfo[block].free.prev = _heapinfo[0].free.prev; | |
814 | _heapinfo[block].free.next = 0; | |
815 | _heapinfo[0].free.prev = block; | |
816 | _heapinfo[_heapinfo[block].free.prev].free.next = block; | |
817 | ++_chunks_free; | |
818 | /* Now loop to use some of that block for this allocation. */ | |
819 | } | |
820 | } | |
821 | ||
822 | /* At this point we have found a suitable free list entry. | |
823 | Figure out how to remove what we need from the list. */ | |
824 | result = ADDRESS (block); | |
825 | if (_heapinfo[block].free.size > blocks) | |
826 | { | |
827 | /* The block we found has a bit left over, | |
828 | so relink the tail end back into the free list. */ | |
829 | _heapinfo[block + blocks].free.size | |
830 | = _heapinfo[block].free.size - blocks; | |
831 | _heapinfo[block + blocks].free.next | |
832 | = _heapinfo[block].free.next; | |
833 | _heapinfo[block + blocks].free.prev | |
834 | = _heapinfo[block].free.prev; | |
835 | _heapinfo[_heapinfo[block].free.prev].free.next | |
836 | = _heapinfo[_heapinfo[block].free.next].free.prev | |
837 | = _heapindex = block + blocks; | |
838 | } | |
839 | else | |
840 | { | |
841 | /* The block exactly matches our requirements, | |
842 | so just remove it from the list. */ | |
843 | _heapinfo[_heapinfo[block].free.next].free.prev | |
844 | = _heapinfo[block].free.prev; | |
845 | _heapinfo[_heapinfo[block].free.prev].free.next | |
846 | = _heapindex = _heapinfo[block].free.next; | |
847 | --_chunks_free; | |
848 | } | |
849 | ||
850 | _heapinfo[block].busy.type = 0; | |
851 | _heapinfo[block].busy.info.size = blocks; | |
852 | ++_chunks_used; | |
853 | _bytes_used += blocks * BLOCKSIZE; | |
854 | _bytes_free -= blocks * BLOCKSIZE; | |
855 | ||
856 | /* Mark all the blocks of the object just allocated except for the | |
857 | first with a negative number so you can find the first block by | |
858 | adding that adjustment. */ | |
859 | while (--blocks > 0) | |
860 | _heapinfo[block + blocks].busy.info.size = -blocks; | |
861 | } | |
862 | ||
5dcab13e | 863 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
864 | return result; |
865 | } | |
866 | ||
867 | __ptr_t | |
868 | malloc (size) | |
869 | __malloc_size_t size; | |
870 | { | |
871 | if (!__malloc_initialized && !__malloc_initialize ()) | |
872 | return NULL; | |
873 | ||
874 | return (__malloc_hook != NULL ? *__malloc_hook : _malloc_internal) (size); | |
875 | } | |
876 | \f | |
877 | #ifndef _LIBC | |
878 | ||
879 | /* On some ANSI C systems, some libc functions call _malloc, _free | |
880 | and _realloc. Make them use the GNU functions. */ | |
881 | ||
882 | __ptr_t | |
883 | _malloc (size) | |
884 | __malloc_size_t size; | |
885 | { | |
886 | return malloc (size); | |
887 | } | |
888 | ||
889 | void | |
890 | _free (ptr) | |
891 | __ptr_t ptr; | |
892 | { | |
893 | free (ptr); | |
894 | } | |
895 | ||
896 | __ptr_t | |
897 | _realloc (ptr, size) | |
898 | __ptr_t ptr; | |
899 | __malloc_size_t size; | |
900 | { | |
901 | return realloc (ptr, size); | |
902 | } | |
903 | ||
904 | #endif | |
905 | /* Free a block of memory allocated by `malloc'. | |
906 | Copyright 1990, 1991, 1992, 1994, 1995 Free Software Foundation, Inc. | |
907 | Written May 1989 by Mike Haertel. | |
908 | ||
909 | This library is free software; you can redistribute it and/or | |
910 | modify it under the terms of the GNU Library General Public License as | |
911 | published by the Free Software Foundation; either version 2 of the | |
912 | License, or (at your option) any later version. | |
913 | ||
914 | This library is distributed in the hope that it will be useful, | |
915 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
916 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
917 | Library General Public License for more details. | |
918 | ||
919 | You should have received a copy of the GNU Library General Public | |
920 | License along with this library; see the file COPYING.LIB. If | |
921 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
922 | Cambridge, MA 02139, USA. | |
923 | ||
924 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
925 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
926 | ||
927 | #ifndef _MALLOC_INTERNAL | |
928 | #define _MALLOC_INTERNAL | |
929 | #include <malloc.h> | |
930 | #endif | |
931 | ||
932 | ||
933 | /* Cope with systems lacking `memmove'. */ | |
934 | #ifndef memmove | |
935 | #if (defined (MEMMOVE_MISSING) || \ | |
936 | !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG)) | |
937 | #ifdef emacs | |
938 | #undef __malloc_safe_bcopy | |
939 | #define __malloc_safe_bcopy safe_bcopy | |
940 | #endif | |
941 | /* This function is defined in realloc.c. */ | |
0a27e8ed | 942 | extern void __malloc_safe_bcopy PP ((__ptr_t, __ptr_t, __malloc_size_t)); |
74ad5c7f KH |
943 | #define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size)) |
944 | #endif | |
945 | #endif | |
946 | ||
947 | ||
948 | /* Debugging hook for free. */ | |
0a27e8ed | 949 | void (*__free_hook) PP ((__ptr_t __ptr)); |
74ad5c7f KH |
950 | |
951 | /* List of blocks allocated by memalign. */ | |
952 | struct alignlist *_aligned_blocks = NULL; | |
953 | ||
954 | /* Return memory to the heap. | |
955 | Like `free' but don't call a __free_hook if there is one. */ | |
956 | void | |
957 | _free_internal (ptr) | |
958 | __ptr_t ptr; | |
959 | { | |
960 | int type; | |
961 | __malloc_size_t block, blocks; | |
962 | register __malloc_size_t i; | |
963 | struct list *prev, *next; | |
964 | __ptr_t curbrk; | |
965 | const __malloc_size_t lesscore_threshold | |
966 | /* Threshold of free space at which we will return some to the system. */ | |
967 | = FINAL_FREE_BLOCKS + 2 * __malloc_extra_blocks; | |
968 | ||
969 | register struct alignlist *l; | |
970 | ||
971 | if (ptr == NULL) | |
972 | return; | |
973 | ||
5dcab13e GM |
974 | PROTECT_MALLOC_STATE (0); |
975 | ||
74ad5c7f KH |
976 | for (l = _aligned_blocks; l != NULL; l = l->next) |
977 | if (l->aligned == ptr) | |
978 | { | |
979 | l->aligned = NULL; /* Mark the slot in the list as free. */ | |
980 | ptr = l->exact; | |
981 | break; | |
982 | } | |
983 | ||
984 | block = BLOCK (ptr); | |
985 | ||
986 | type = _heapinfo[block].busy.type; | |
987 | switch (type) | |
988 | { | |
989 | case 0: | |
990 | /* Get as many statistics as early as we can. */ | |
991 | --_chunks_used; | |
992 | _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE; | |
993 | _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE; | |
994 | ||
995 | /* Find the free cluster previous to this one in the free list. | |
996 | Start searching at the last block referenced; this may benefit | |
997 | programs with locality of allocation. */ | |
998 | i = _heapindex; | |
999 | if (i > block) | |
1000 | while (i > block) | |
1001 | i = _heapinfo[i].free.prev; | |
1002 | else | |
1003 | { | |
1004 | do | |
1005 | i = _heapinfo[i].free.next; | |
1006 | while (i > 0 && i < block); | |
1007 | i = _heapinfo[i].free.prev; | |
1008 | } | |
1009 | ||
1010 | /* Determine how to link this block into the free list. */ | |
1011 | if (block == i + _heapinfo[i].free.size) | |
1012 | { | |
1013 | /* Coalesce this block with its predecessor. */ | |
1014 | _heapinfo[i].free.size += _heapinfo[block].busy.info.size; | |
1015 | block = i; | |
1016 | } | |
1017 | else | |
1018 | { | |
1019 | /* Really link this block back into the free list. */ | |
1020 | _heapinfo[block].free.size = _heapinfo[block].busy.info.size; | |
1021 | _heapinfo[block].free.next = _heapinfo[i].free.next; | |
1022 | _heapinfo[block].free.prev = i; | |
1023 | _heapinfo[i].free.next = block; | |
1024 | _heapinfo[_heapinfo[block].free.next].free.prev = block; | |
1025 | ++_chunks_free; | |
1026 | } | |
1027 | ||
1028 | /* Now that the block is linked in, see if we can coalesce it | |
1029 | with its successor (by deleting its successor from the list | |
1030 | and adding in its size). */ | |
1031 | if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) | |
1032 | { | |
1033 | _heapinfo[block].free.size | |
1034 | += _heapinfo[_heapinfo[block].free.next].free.size; | |
1035 | _heapinfo[block].free.next | |
1036 | = _heapinfo[_heapinfo[block].free.next].free.next; | |
1037 | _heapinfo[_heapinfo[block].free.next].free.prev = block; | |
1038 | --_chunks_free; | |
1039 | } | |
1040 | ||
1041 | /* How many trailing free blocks are there now? */ | |
1042 | blocks = _heapinfo[block].free.size; | |
1043 | ||
1044 | /* Where is the current end of accessible core? */ | |
1045 | curbrk = (*__morecore) (0); | |
1046 | ||
1047 | if (_heaplimit != 0 && curbrk == ADDRESS (_heaplimit)) | |
1048 | { | |
1049 | /* The end of the malloc heap is at the end of accessible core. | |
1050 | It's possible that moving _heapinfo will allow us to | |
1051 | return some space to the system. */ | |
1052 | ||
1053 | __malloc_size_t info_block = BLOCK (_heapinfo); | |
1054 | __malloc_size_t info_blocks = _heapinfo[info_block].busy.info.size; | |
1055 | __malloc_size_t prev_block = _heapinfo[block].free.prev; | |
1056 | __malloc_size_t prev_blocks = _heapinfo[prev_block].free.size; | |
1057 | __malloc_size_t next_block = _heapinfo[block].free.next; | |
1058 | __malloc_size_t next_blocks = _heapinfo[next_block].free.size; | |
1059 | ||
1060 | if (/* Win if this block being freed is last in core, the info table | |
1061 | is just before it, the previous free block is just before the | |
1062 | info table, and the two free blocks together form a useful | |
1063 | amount to return to the system. */ | |
1064 | (block + blocks == _heaplimit && | |
1065 | info_block + info_blocks == block && | |
1066 | prev_block != 0 && prev_block + prev_blocks == info_block && | |
1067 | blocks + prev_blocks >= lesscore_threshold) || | |
1068 | /* Nope, not the case. We can also win if this block being | |
1069 | freed is just before the info table, and the table extends | |
1070 | to the end of core or is followed only by a free block, | |
1071 | and the total free space is worth returning to the system. */ | |
1072 | (block + blocks == info_block && | |
1073 | ((info_block + info_blocks == _heaplimit && | |
1074 | blocks >= lesscore_threshold) || | |
1075 | (info_block + info_blocks == next_block && | |
1076 | next_block + next_blocks == _heaplimit && | |
1077 | blocks + next_blocks >= lesscore_threshold))) | |
1078 | ) | |
1079 | { | |
1080 | malloc_info *newinfo; | |
1081 | __malloc_size_t oldlimit = _heaplimit; | |
1082 | ||
1083 | /* Free the old info table, clearing _heaplimit to avoid | |
1084 | recursion into this code. We don't want to return the | |
1085 | table's blocks to the system before we have copied them to | |
1086 | the new location. */ | |
1087 | _heaplimit = 0; | |
1088 | _free_internal (_heapinfo); | |
1089 | _heaplimit = oldlimit; | |
1090 | ||
1091 | /* Tell malloc to search from the beginning of the heap for | |
1092 | free blocks, so it doesn't reuse the ones just freed. */ | |
1093 | _heapindex = 0; | |
1094 | ||
1095 | /* Allocate new space for the info table and move its data. */ | |
1096 | newinfo = (malloc_info *) _malloc_internal (info_blocks | |
1097 | * BLOCKSIZE); | |
5dcab13e | 1098 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
1099 | memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE); |
1100 | _heapinfo = newinfo; | |
1101 | ||
1102 | /* We should now have coalesced the free block with the | |
1103 | blocks freed from the old info table. Examine the entire | |
1104 | trailing free block to decide below whether to return some | |
1105 | to the system. */ | |
1106 | block = _heapinfo[0].free.prev; | |
1107 | blocks = _heapinfo[block].free.size; | |
1108 | } | |
1109 | ||
1110 | /* Now see if we can return stuff to the system. */ | |
1111 | if (block + blocks == _heaplimit && blocks >= lesscore_threshold) | |
1112 | { | |
1113 | register __malloc_size_t bytes = blocks * BLOCKSIZE; | |
1114 | _heaplimit -= blocks; | |
1115 | (*__morecore) (-bytes); | |
1116 | _heapinfo[_heapinfo[block].free.prev].free.next | |
1117 | = _heapinfo[block].free.next; | |
1118 | _heapinfo[_heapinfo[block].free.next].free.prev | |
1119 | = _heapinfo[block].free.prev; | |
1120 | block = _heapinfo[block].free.prev; | |
1121 | --_chunks_free; | |
1122 | _bytes_free -= bytes; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* Set the next search to begin at this block. */ | |
1127 | _heapindex = block; | |
1128 | break; | |
1129 | ||
1130 | default: | |
1131 | /* Do some of the statistics. */ | |
1132 | --_chunks_used; | |
1133 | _bytes_used -= 1 << type; | |
1134 | ++_chunks_free; | |
1135 | _bytes_free += 1 << type; | |
1136 | ||
1137 | /* Get the address of the first free fragment in this block. */ | |
1138 | prev = (struct list *) ((char *) ADDRESS (block) + | |
1139 | (_heapinfo[block].busy.info.frag.first << type)); | |
1140 | ||
1141 | if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1) | |
1142 | { | |
1143 | /* If all fragments of this block are free, remove them | |
1144 | from the fragment list and free the whole block. */ | |
1145 | next = prev; | |
1146 | for (i = 1; i < (__malloc_size_t) (BLOCKSIZE >> type); ++i) | |
1147 | next = next->next; | |
1148 | prev->prev->next = next; | |
1149 | if (next != NULL) | |
1150 | next->prev = prev->prev; | |
1151 | _heapinfo[block].busy.type = 0; | |
1152 | _heapinfo[block].busy.info.size = 1; | |
1153 | ||
1154 | /* Keep the statistics accurate. */ | |
1155 | ++_chunks_used; | |
1156 | _bytes_used += BLOCKSIZE; | |
1157 | _chunks_free -= BLOCKSIZE >> type; | |
1158 | _bytes_free -= BLOCKSIZE; | |
1159 | ||
8094989b GM |
1160 | #ifdef GC_MALLOC_CHECK |
1161 | _free_internal (ADDRESS (block)); | |
1162 | #else | |
74ad5c7f | 1163 | free (ADDRESS (block)); |
8094989b | 1164 | #endif |
74ad5c7f KH |
1165 | } |
1166 | else if (_heapinfo[block].busy.info.frag.nfree != 0) | |
1167 | { | |
1168 | /* If some fragments of this block are free, link this | |
1169 | fragment into the fragment list after the first free | |
1170 | fragment of this block. */ | |
1171 | next = (struct list *) ptr; | |
1172 | next->next = prev->next; | |
1173 | next->prev = prev; | |
1174 | prev->next = next; | |
1175 | if (next->next != NULL) | |
1176 | next->next->prev = next; | |
1177 | ++_heapinfo[block].busy.info.frag.nfree; | |
1178 | } | |
1179 | else | |
1180 | { | |
1181 | /* No fragments of this block are free, so link this | |
1182 | fragment into the fragment list and announce that | |
1183 | it is the first free fragment of this block. */ | |
1184 | prev = (struct list *) ptr; | |
1185 | _heapinfo[block].busy.info.frag.nfree = 1; | |
1186 | _heapinfo[block].busy.info.frag.first = (unsigned long int) | |
1187 | ((unsigned long int) ((char *) ptr - (char *) NULL) | |
1188 | % BLOCKSIZE >> type); | |
1189 | prev->next = _fraghead[type].next; | |
1190 | prev->prev = &_fraghead[type]; | |
1191 | prev->prev->next = prev; | |
1192 | if (prev->next != NULL) | |
1193 | prev->next->prev = prev; | |
1194 | } | |
1195 | break; | |
1196 | } | |
5dcab13e GM |
1197 | |
1198 | PROTECT_MALLOC_STATE (1); | |
74ad5c7f KH |
1199 | } |
1200 | ||
1201 | /* Return memory to the heap. */ | |
ca9c0567 PE |
1202 | |
1203 | FREE_RETURN_TYPE | |
74ad5c7f KH |
1204 | free (ptr) |
1205 | __ptr_t ptr; | |
1206 | { | |
1207 | if (__free_hook != NULL) | |
1208 | (*__free_hook) (ptr); | |
1209 | else | |
1210 | _free_internal (ptr); | |
1211 | } | |
1212 | ||
1213 | /* Define the `cfree' alias for `free'. */ | |
1214 | #ifdef weak_alias | |
1215 | weak_alias (free, cfree) | |
1216 | #else | |
1217 | void | |
1218 | cfree (ptr) | |
1219 | __ptr_t ptr; | |
1220 | { | |
1221 | free (ptr); | |
1222 | } | |
1223 | #endif | |
1224 | /* Change the size of a block allocated by `malloc'. | |
1225 | Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
1226 | Written May 1989 by Mike Haertel. | |
1227 | ||
1228 | This library is free software; you can redistribute it and/or | |
1229 | modify it under the terms of the GNU Library General Public License as | |
1230 | published by the Free Software Foundation; either version 2 of the | |
1231 | License, or (at your option) any later version. | |
1232 | ||
1233 | This library is distributed in the hope that it will be useful, | |
1234 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1235 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1236 | Library General Public License for more details. | |
1237 | ||
1238 | You should have received a copy of the GNU Library General Public | |
1239 | License along with this library; see the file COPYING.LIB. If | |
1240 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1241 | Cambridge, MA 02139, USA. | |
1242 | ||
1243 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1244 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1245 | ||
1246 | #ifndef _MALLOC_INTERNAL | |
1247 | #define _MALLOC_INTERNAL | |
1248 | #include <malloc.h> | |
1249 | #endif | |
1250 | ||
1251 | ||
1252 | ||
1253 | /* Cope with systems lacking `memmove'. */ | |
1254 | #if (defined (MEMMOVE_MISSING) || \ | |
1255 | !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG)) | |
1256 | ||
1257 | #ifdef emacs | |
1258 | #undef __malloc_safe_bcopy | |
1259 | #define __malloc_safe_bcopy safe_bcopy | |
1260 | #else | |
1261 | ||
1262 | /* Snarfed directly from Emacs src/dispnew.c: | |
1263 | XXX Should use system bcopy if it handles overlap. */ | |
1264 | ||
1265 | /* Like bcopy except never gets confused by overlap. */ | |
1266 | ||
1267 | void | |
1268 | __malloc_safe_bcopy (afrom, ato, size) | |
1269 | __ptr_t afrom; | |
1270 | __ptr_t ato; | |
1271 | __malloc_size_t size; | |
1272 | { | |
1273 | char *from = afrom, *to = ato; | |
1274 | ||
1275 | if (size <= 0 || from == to) | |
1276 | return; | |
1277 | ||
1278 | /* If the source and destination don't overlap, then bcopy can | |
1279 | handle it. If they do overlap, but the destination is lower in | |
1280 | memory than the source, we'll assume bcopy can handle that. */ | |
1281 | if (to < from || from + size <= to) | |
1282 | bcopy (from, to, size); | |
1283 | ||
1284 | /* Otherwise, we'll copy from the end. */ | |
1285 | else | |
1286 | { | |
1287 | register char *endf = from + size; | |
1288 | register char *endt = to + size; | |
1289 | ||
1290 | /* If TO - FROM is large, then we should break the copy into | |
1291 | nonoverlapping chunks of TO - FROM bytes each. However, if | |
1292 | TO - FROM is small, then the bcopy function call overhead | |
1293 | makes this not worth it. The crossover point could be about | |
1294 | anywhere. Since I don't think the obvious copy loop is too | |
1295 | bad, I'm trying to err in its favor. */ | |
1296 | if (to - from < 64) | |
1297 | { | |
1298 | do | |
1299 | *--endt = *--endf; | |
1300 | while (endf != from); | |
1301 | } | |
1302 | else | |
1303 | { | |
1304 | for (;;) | |
1305 | { | |
1306 | endt -= (to - from); | |
1307 | endf -= (to - from); | |
1308 | ||
1309 | if (endt < to) | |
1310 | break; | |
1311 | ||
1312 | bcopy (endf, endt, to - from); | |
1313 | } | |
1314 | ||
1315 | /* If SIZE wasn't a multiple of TO - FROM, there will be a | |
1316 | little left over. The amount left over is | |
1317 | (endt + (to - from)) - to, which is endt - from. */ | |
1318 | bcopy (from, to, endt - from); | |
1319 | } | |
1320 | } | |
1321 | } | |
1322 | #endif /* emacs */ | |
1323 | ||
1324 | #ifndef memmove | |
0a27e8ed | 1325 | extern void __malloc_safe_bcopy PP ((__ptr_t, __ptr_t, __malloc_size_t)); |
74ad5c7f KH |
1326 | #define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size)) |
1327 | #endif | |
1328 | ||
1329 | #endif | |
1330 | ||
1331 | ||
1332 | #define min(A, B) ((A) < (B) ? (A) : (B)) | |
1333 | ||
1334 | /* Debugging hook for realloc. */ | |
0a27e8ed | 1335 | __ptr_t (*__realloc_hook) PP ((__ptr_t __ptr, __malloc_size_t __size)); |
74ad5c7f KH |
1336 | |
1337 | /* Resize the given region to the new size, returning a pointer | |
1338 | to the (possibly moved) region. This is optimized for speed; | |
1339 | some benchmarks seem to indicate that greater compactness is | |
1340 | achieved by unconditionally allocating and copying to a | |
1341 | new region. This module has incestuous knowledge of the | |
1342 | internals of both free and malloc. */ | |
1343 | __ptr_t | |
1344 | _realloc_internal (ptr, size) | |
1345 | __ptr_t ptr; | |
1346 | __malloc_size_t size; | |
1347 | { | |
1348 | __ptr_t result; | |
1349 | int type; | |
1350 | __malloc_size_t block, blocks, oldlimit; | |
1351 | ||
1352 | if (size == 0) | |
1353 | { | |
1354 | _free_internal (ptr); | |
1355 | return _malloc_internal (0); | |
1356 | } | |
1357 | else if (ptr == NULL) | |
1358 | return _malloc_internal (size); | |
1359 | ||
1360 | block = BLOCK (ptr); | |
1361 | ||
5dcab13e GM |
1362 | PROTECT_MALLOC_STATE (0); |
1363 | ||
74ad5c7f KH |
1364 | type = _heapinfo[block].busy.type; |
1365 | switch (type) | |
1366 | { | |
1367 | case 0: | |
1368 | /* Maybe reallocate a large block to a small fragment. */ | |
1369 | if (size <= BLOCKSIZE / 2) | |
1370 | { | |
1371 | result = _malloc_internal (size); | |
1372 | if (result != NULL) | |
1373 | { | |
1374 | memcpy (result, ptr, size); | |
1375 | _free_internal (ptr); | |
1376 | return result; | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | /* The new size is a large allocation as well; | |
1381 | see if we can hold it in place. */ | |
1382 | blocks = BLOCKIFY (size); | |
1383 | if (blocks < _heapinfo[block].busy.info.size) | |
1384 | { | |
1385 | /* The new size is smaller; return | |
1386 | excess memory to the free list. */ | |
1387 | _heapinfo[block + blocks].busy.type = 0; | |
1388 | _heapinfo[block + blocks].busy.info.size | |
1389 | = _heapinfo[block].busy.info.size - blocks; | |
1390 | _heapinfo[block].busy.info.size = blocks; | |
1391 | /* We have just created a new chunk by splitting a chunk in two. | |
1392 | Now we will free this chunk; increment the statistics counter | |
1393 | so it doesn't become wrong when _free_internal decrements it. */ | |
1394 | ++_chunks_used; | |
1395 | _free_internal (ADDRESS (block + blocks)); | |
1396 | result = ptr; | |
1397 | } | |
1398 | else if (blocks == _heapinfo[block].busy.info.size) | |
1399 | /* No size change necessary. */ | |
1400 | result = ptr; | |
1401 | else | |
1402 | { | |
1403 | /* Won't fit, so allocate a new region that will. | |
1404 | Free the old region first in case there is sufficient | |
1405 | adjacent free space to grow without moving. */ | |
1406 | blocks = _heapinfo[block].busy.info.size; | |
1407 | /* Prevent free from actually returning memory to the system. */ | |
1408 | oldlimit = _heaplimit; | |
1409 | _heaplimit = 0; | |
1410 | _free_internal (ptr); | |
1411 | result = _malloc_internal (size); | |
5dcab13e | 1412 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
1413 | if (_heaplimit == 0) |
1414 | _heaplimit = oldlimit; | |
1415 | if (result == NULL) | |
1416 | { | |
1417 | /* Now we're really in trouble. We have to unfree | |
1418 | the thing we just freed. Unfortunately it might | |
1419 | have been coalesced with its neighbors. */ | |
1420 | if (_heapindex == block) | |
1421 | (void) _malloc_internal (blocks * BLOCKSIZE); | |
1422 | else | |
1423 | { | |
1424 | __ptr_t previous | |
1425 | = _malloc_internal ((block - _heapindex) * BLOCKSIZE); | |
1426 | (void) _malloc_internal (blocks * BLOCKSIZE); | |
1427 | _free_internal (previous); | |
1428 | } | |
1429 | return NULL; | |
1430 | } | |
1431 | if (ptr != result) | |
1432 | memmove (result, ptr, blocks * BLOCKSIZE); | |
1433 | } | |
1434 | break; | |
1435 | ||
1436 | default: | |
1437 | /* Old size is a fragment; type is logarithm | |
1438 | to base two of the fragment size. */ | |
1439 | if (size > (__malloc_size_t) (1 << (type - 1)) && | |
1440 | size <= (__malloc_size_t) (1 << type)) | |
1441 | /* The new size is the same kind of fragment. */ | |
1442 | result = ptr; | |
1443 | else | |
1444 | { | |
1445 | /* The new size is different; allocate a new space, | |
1446 | and copy the lesser of the new size and the old. */ | |
1447 | result = _malloc_internal (size); | |
1448 | if (result == NULL) | |
1449 | return NULL; | |
1450 | memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type)); | |
1451 | _free_internal (ptr); | |
1452 | } | |
1453 | break; | |
1454 | } | |
1455 | ||
5dcab13e | 1456 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
1457 | return result; |
1458 | } | |
1459 | ||
1460 | __ptr_t | |
1461 | realloc (ptr, size) | |
1462 | __ptr_t ptr; | |
1463 | __malloc_size_t size; | |
1464 | { | |
1465 | if (!__malloc_initialized && !__malloc_initialize ()) | |
1466 | return NULL; | |
1467 | ||
1468 | return (__realloc_hook != NULL ? *__realloc_hook : _realloc_internal) | |
1469 | (ptr, size); | |
1470 | } | |
1471 | /* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc. | |
1472 | ||
1473 | This library is free software; you can redistribute it and/or | |
1474 | modify it under the terms of the GNU Library General Public License as | |
1475 | published by the Free Software Foundation; either version 2 of the | |
1476 | License, or (at your option) any later version. | |
1477 | ||
1478 | This library is distributed in the hope that it will be useful, | |
1479 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1480 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1481 | Library General Public License for more details. | |
1482 | ||
1483 | You should have received a copy of the GNU Library General Public | |
1484 | License along with this library; see the file COPYING.LIB. If | |
1485 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1486 | Cambridge, MA 02139, USA. | |
1487 | ||
1488 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1489 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1490 | ||
1491 | #ifndef _MALLOC_INTERNAL | |
1492 | #define _MALLOC_INTERNAL | |
1493 | #include <malloc.h> | |
1494 | #endif | |
1495 | ||
1496 | /* Allocate an array of NMEMB elements each SIZE bytes long. | |
1497 | The entire array is initialized to zeros. */ | |
1498 | __ptr_t | |
1499 | calloc (nmemb, size) | |
1500 | register __malloc_size_t nmemb; | |
1501 | register __malloc_size_t size; | |
1502 | { | |
1503 | register __ptr_t result = malloc (nmemb * size); | |
1504 | ||
1505 | if (result != NULL) | |
1506 | (void) memset (result, 0, nmemb * size); | |
1507 | ||
1508 | return result; | |
1509 | } | |
1510 | /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
1511 | This file is part of the GNU C Library. | |
1512 | ||
1513 | The GNU C Library is free software; you can redistribute it and/or modify | |
1514 | it under the terms of the GNU General Public License as published by | |
1515 | the Free Software Foundation; either version 2, or (at your option) | |
1516 | any later version. | |
1517 | ||
1518 | The GNU C Library is distributed in the hope that it will be useful, | |
1519 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1520 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1521 | GNU General Public License for more details. | |
1522 | ||
1523 | You should have received a copy of the GNU General Public License | |
1524 | along with the GNU C Library; see the file COPYING. If not, write to | |
1525 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
1526 | ||
1527 | #ifndef _MALLOC_INTERNAL | |
1528 | #define _MALLOC_INTERNAL | |
1529 | #include <malloc.h> | |
1530 | #endif | |
1531 | ||
1532 | #ifndef __GNU_LIBRARY__ | |
1533 | #define __sbrk sbrk | |
1534 | #endif | |
1535 | ||
1536 | #ifdef __GNU_LIBRARY__ | |
1537 | /* It is best not to declare this and cast its result on foreign operating | |
1538 | systems with potentially hostile include files. */ | |
1539 | ||
1540 | #include <stddef.h> | |
0a27e8ed | 1541 | extern __ptr_t __sbrk PP ((ptrdiff_t increment)); |
74ad5c7f KH |
1542 | #endif |
1543 | ||
1544 | #ifndef NULL | |
1545 | #define NULL 0 | |
1546 | #endif | |
1547 | ||
1548 | /* Allocate INCREMENT more bytes of data space, | |
1549 | and return the start of data space, or NULL on errors. | |
1550 | If INCREMENT is negative, shrink data space. */ | |
1551 | __ptr_t | |
1552 | __default_morecore (increment) | |
1553 | __malloc_ptrdiff_t increment; | |
1554 | { | |
1555 | __ptr_t result = (__ptr_t) __sbrk (increment); | |
1556 | if (result == (__ptr_t) -1) | |
1557 | return NULL; | |
1558 | return result; | |
1559 | } | |
1560 | /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. | |
1561 | ||
1562 | This library is free software; you can redistribute it and/or | |
1563 | modify it under the terms of the GNU Library General Public License as | |
1564 | published by the Free Software Foundation; either version 2 of the | |
1565 | License, or (at your option) any later version. | |
1566 | ||
1567 | This library is distributed in the hope that it will be useful, | |
1568 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1569 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1570 | Library General Public License for more details. | |
1571 | ||
1572 | You should have received a copy of the GNU Library General Public | |
1573 | License along with this library; see the file COPYING.LIB. If | |
1574 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1575 | Cambridge, MA 02139, USA. */ | |
1576 | ||
1577 | #ifndef _MALLOC_INTERNAL | |
1578 | #define _MALLOC_INTERNAL | |
1579 | #include <malloc.h> | |
1580 | #endif | |
1581 | ||
1582 | #if __DJGPP__ - 0 == 1 | |
1583 | ||
1584 | /* There is some problem with memalign in DJGPP v1 and we are supposed | |
1585 | to omit it. Noone told me why, they just told me to do it. */ | |
1586 | ||
1587 | #else | |
1588 | ||
0a27e8ed | 1589 | __ptr_t (*__memalign_hook) PP ((size_t __size, size_t __alignment)); |
74ad5c7f KH |
1590 | |
1591 | __ptr_t | |
1592 | memalign (alignment, size) | |
1593 | __malloc_size_t alignment; | |
1594 | __malloc_size_t size; | |
1595 | { | |
1596 | __ptr_t result; | |
1597 | unsigned long int adj, lastadj; | |
1598 | ||
1599 | if (__memalign_hook) | |
1600 | return (*__memalign_hook) (alignment, size); | |
1601 | ||
1602 | /* Allocate a block with enough extra space to pad the block with up to | |
1603 | (ALIGNMENT - 1) bytes if necessary. */ | |
1604 | result = malloc (size + alignment - 1); | |
1605 | if (result == NULL) | |
1606 | return NULL; | |
1607 | ||
1608 | /* Figure out how much we will need to pad this particular block | |
1609 | to achieve the required alignment. */ | |
1610 | adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment; | |
1611 | ||
1612 | do | |
1613 | { | |
1614 | /* Reallocate the block with only as much excess as it needs. */ | |
1615 | free (result); | |
1616 | result = malloc (adj + size); | |
1617 | if (result == NULL) /* Impossible unless interrupted. */ | |
1618 | return NULL; | |
1619 | ||
1620 | lastadj = adj; | |
1621 | adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment; | |
1622 | /* It's conceivable we might have been so unlucky as to get a | |
1623 | different block with weaker alignment. If so, this block is too | |
1624 | short to contain SIZE after alignment correction. So we must | |
1625 | try again and get another block, slightly larger. */ | |
1626 | } while (adj > lastadj); | |
1627 | ||
1628 | if (adj != 0) | |
1629 | { | |
1630 | /* Record this block in the list of aligned blocks, so that `free' | |
1631 | can identify the pointer it is passed, which will be in the middle | |
1632 | of an allocated block. */ | |
1633 | ||
1634 | struct alignlist *l; | |
1635 | for (l = _aligned_blocks; l != NULL; l = l->next) | |
1636 | if (l->aligned == NULL) | |
1637 | /* This slot is free. Use it. */ | |
1638 | break; | |
1639 | if (l == NULL) | |
1640 | { | |
1641 | l = (struct alignlist *) malloc (sizeof (struct alignlist)); | |
1642 | if (l == NULL) | |
1643 | { | |
1644 | free (result); | |
1645 | return NULL; | |
1646 | } | |
1647 | l->next = _aligned_blocks; | |
1648 | _aligned_blocks = l; | |
1649 | } | |
1650 | l->exact = result; | |
1651 | result = l->aligned = (char *) result + alignment - adj; | |
1652 | } | |
1653 | ||
1654 | return result; | |
1655 | } | |
1656 | ||
1657 | #endif /* Not DJGPP v1 */ | |
1658 | /* Allocate memory on a page boundary. | |
1659 | Copyright (C) 1991, 92, 93, 94, 96 Free Software Foundation, Inc. | |
1660 | ||
1661 | This library is free software; you can redistribute it and/or | |
1662 | modify it under the terms of the GNU Library General Public License as | |
1663 | published by the Free Software Foundation; either version 2 of the | |
1664 | License, or (at your option) any later version. | |
1665 | ||
1666 | This library is distributed in the hope that it will be useful, | |
1667 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1668 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1669 | Library General Public License for more details. | |
1670 | ||
1671 | You should have received a copy of the GNU Library General Public | |
1672 | License along with this library; see the file COPYING.LIB. If | |
1673 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1674 | Cambridge, MA 02139, USA. | |
1675 | ||
1676 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1677 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1678 | ||
1679 | #if defined (_MALLOC_INTERNAL) && defined (GMALLOC_INHIBIT_VALLOC) | |
1680 | ||
1681 | /* Emacs defines GMALLOC_INHIBIT_VALLOC to avoid this definition | |
1682 | on MSDOS, where it conflicts with a system header file. */ | |
1683 | ||
1684 | #define ELIDE_VALLOC | |
1685 | ||
1686 | #endif | |
1687 | ||
1688 | #ifndef ELIDE_VALLOC | |
1689 | ||
1690 | #if defined (__GNU_LIBRARY__) || defined (_LIBC) | |
1691 | #include <stddef.h> | |
1692 | #include <sys/cdefs.h> | |
47582ab3 KH |
1693 | #if defined (__GLIBC__) && __GLIBC__ >= 2 |
1694 | /* __getpagesize is already declared in <unistd.h> with return type int */ | |
1695 | #else | |
0a27e8ed | 1696 | extern size_t __getpagesize PP ((void)); |
47582ab3 | 1697 | #endif |
74ad5c7f KH |
1698 | #else |
1699 | #include "getpagesize.h" | |
1700 | #define __getpagesize() getpagesize() | |
1701 | #endif | |
1702 | ||
1703 | #ifndef _MALLOC_INTERNAL | |
1704 | #define _MALLOC_INTERNAL | |
1705 | #include <malloc.h> | |
1706 | #endif | |
1707 | ||
1708 | static __malloc_size_t pagesize; | |
1709 | ||
1710 | __ptr_t | |
1711 | valloc (size) | |
1712 | __malloc_size_t size; | |
1713 | { | |
1714 | if (pagesize == 0) | |
1715 | pagesize = __getpagesize (); | |
1716 | ||
1717 | return memalign (pagesize, size); | |
1718 | } | |
1719 | ||
1720 | #endif /* Not ELIDE_VALLOC. */ |