Commit | Line | Data |
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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 | ||
ceeb3d7d EZ |
440 | /* align accepts an unsigned argument, but __morecore accepts a |
441 | signed one. This could lead to trouble if SIZE overflows a | |
442 | signed int type accepted by __morecore. We just punt in that | |
443 | case, since they are requesting a ludicrous amount anyway. */ | |
444 | if ((__malloc_ptrdiff_t)size < 0) | |
445 | result = 0; | |
446 | else | |
447 | result = (*__morecore) (size); | |
74ad5c7f KH |
448 | adj = (unsigned long int) ((unsigned long int) ((char *) result - |
449 | (char *) NULL)) % BLOCKSIZE; | |
450 | if (adj != 0) | |
451 | { | |
452 | __ptr_t new; | |
453 | adj = BLOCKSIZE - adj; | |
454 | new = (*__morecore) (adj); | |
455 | result = (char *) result + adj; | |
456 | } | |
457 | ||
458 | if (__after_morecore_hook) | |
459 | (*__after_morecore_hook) (); | |
460 | ||
461 | return result; | |
462 | } | |
463 | ||
464 | /* Get SIZE bytes, if we can get them starting at END. | |
465 | Return the address of the space we got. | |
466 | If we cannot get space at END, fail and return 0. */ | |
0a27e8ed | 467 | static __ptr_t get_contiguous_space PP ((__malloc_ptrdiff_t, __ptr_t)); |
74ad5c7f KH |
468 | static __ptr_t |
469 | get_contiguous_space (size, position) | |
470 | __malloc_ptrdiff_t size; | |
471 | __ptr_t position; | |
472 | { | |
473 | __ptr_t before; | |
474 | __ptr_t after; | |
475 | ||
476 | before = (*__morecore) (0); | |
477 | /* If we can tell in advance that the break is at the wrong place, | |
478 | fail now. */ | |
479 | if (before != position) | |
480 | return 0; | |
481 | ||
482 | /* Allocate SIZE bytes and get the address of them. */ | |
483 | after = (*__morecore) (size); | |
484 | if (!after) | |
485 | return 0; | |
486 | ||
487 | /* It was not contiguous--reject it. */ | |
488 | if (after != position) | |
489 | { | |
490 | (*__morecore) (- size); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | return after; | |
495 | } | |
496 | ||
497 | ||
498 | /* This is called when `_heapinfo' and `heapsize' have just | |
499 | been set to describe a new info table. Set up the table | |
500 | to describe itself and account for it in the statistics. */ | |
0a27e8ed | 501 | static void register_heapinfo PP ((void)); |
74ad5c7f KH |
502 | #ifdef __GNUC__ |
503 | __inline__ | |
504 | #endif | |
505 | static void | |
506 | register_heapinfo () | |
507 | { | |
508 | __malloc_size_t block, blocks; | |
509 | ||
510 | block = BLOCK (_heapinfo); | |
511 | blocks = BLOCKIFY (heapsize * sizeof (malloc_info)); | |
512 | ||
513 | /* Account for the _heapinfo block itself in the statistics. */ | |
514 | _bytes_used += blocks * BLOCKSIZE; | |
515 | ++_chunks_used; | |
516 | ||
517 | /* Describe the heapinfo block itself in the heapinfo. */ | |
518 | _heapinfo[block].busy.type = 0; | |
519 | _heapinfo[block].busy.info.size = blocks; | |
520 | /* Leave back-pointers for malloc_find_address. */ | |
521 | while (--blocks > 0) | |
522 | _heapinfo[block + blocks].busy.info.size = -blocks; | |
523 | } | |
524 | ||
525 | /* Set everything up and remember that we have. */ | |
526 | int | |
527 | __malloc_initialize () | |
528 | { | |
529 | if (__malloc_initialized) | |
530 | return 0; | |
531 | ||
a3ba27da GM |
532 | #ifdef GC_MCHECK |
533 | mcheck (NULL); | |
534 | #endif | |
535 | ||
74ad5c7f KH |
536 | if (__malloc_initialize_hook) |
537 | (*__malloc_initialize_hook) (); | |
538 | ||
539 | heapsize = HEAP / BLOCKSIZE; | |
540 | _heapinfo = (malloc_info *) align (heapsize * sizeof (malloc_info)); | |
541 | if (_heapinfo == NULL) | |
542 | return 0; | |
543 | memset (_heapinfo, 0, heapsize * sizeof (malloc_info)); | |
544 | _heapinfo[0].free.size = 0; | |
545 | _heapinfo[0].free.next = _heapinfo[0].free.prev = 0; | |
546 | _heapindex = 0; | |
547 | _heapbase = (char *) _heapinfo; | |
548 | _heaplimit = BLOCK (_heapbase + heapsize * sizeof (malloc_info)); | |
549 | ||
550 | register_heapinfo (); | |
551 | ||
552 | __malloc_initialized = 1; | |
5dcab13e | 553 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
554 | return 1; |
555 | } | |
556 | ||
557 | static int morecore_recursing; | |
558 | ||
559 | /* Get neatly aligned memory, initializing or | |
560 | growing the heap info table as necessary. */ | |
0a27e8ed | 561 | static __ptr_t morecore PP ((__malloc_size_t)); |
74ad5c7f KH |
562 | static __ptr_t |
563 | morecore (size) | |
564 | __malloc_size_t size; | |
565 | { | |
566 | __ptr_t result; | |
567 | malloc_info *newinfo, *oldinfo; | |
568 | __malloc_size_t newsize; | |
569 | ||
570 | if (morecore_recursing) | |
571 | /* Avoid recursion. The caller will know how to handle a null return. */ | |
572 | return NULL; | |
573 | ||
574 | result = align (size); | |
575 | if (result == NULL) | |
576 | return NULL; | |
577 | ||
5dcab13e GM |
578 | PROTECT_MALLOC_STATE (0); |
579 | ||
74ad5c7f KH |
580 | /* Check if we need to grow the info table. */ |
581 | if ((__malloc_size_t) BLOCK ((char *) result + size) > heapsize) | |
582 | { | |
583 | /* Calculate the new _heapinfo table size. We do not account for the | |
584 | added blocks in the table itself, as we hope to place them in | |
585 | existing free space, which is already covered by part of the | |
586 | existing table. */ | |
587 | newsize = heapsize; | |
588 | do | |
589 | newsize *= 2; | |
590 | while ((__malloc_size_t) BLOCK ((char *) result + size) > newsize); | |
591 | ||
592 | /* We must not reuse existing core for the new info table when called | |
593 | from realloc in the case of growing a large block, because the | |
594 | block being grown is momentarily marked as free. In this case | |
595 | _heaplimit is zero so we know not to reuse space for internal | |
596 | allocation. */ | |
597 | if (_heaplimit != 0) | |
598 | { | |
599 | /* First try to allocate the new info table in core we already | |
600 | have, in the usual way using realloc. If realloc cannot | |
601 | extend it in place or relocate it to existing sufficient core, | |
602 | we will get called again, and the code above will notice the | |
603 | `morecore_recursing' flag and return null. */ | |
604 | int save = errno; /* Don't want to clobber errno with ENOMEM. */ | |
605 | morecore_recursing = 1; | |
606 | newinfo = (malloc_info *) _realloc_internal | |
607 | (_heapinfo, newsize * sizeof (malloc_info)); | |
608 | morecore_recursing = 0; | |
609 | if (newinfo == NULL) | |
610 | errno = save; | |
611 | else | |
612 | { | |
613 | /* We found some space in core, and realloc has put the old | |
614 | table's blocks on the free list. Now zero the new part | |
615 | of the table and install the new table location. */ | |
616 | memset (&newinfo[heapsize], 0, | |
617 | (newsize - heapsize) * sizeof (malloc_info)); | |
618 | _heapinfo = newinfo; | |
619 | heapsize = newsize; | |
620 | goto got_heap; | |
621 | } | |
622 | } | |
623 | ||
624 | /* Allocate new space for the malloc info table. */ | |
625 | while (1) | |
626 | { | |
627 | newinfo = (malloc_info *) align (newsize * sizeof (malloc_info)); | |
628 | ||
629 | /* Did it fail? */ | |
630 | if (newinfo == NULL) | |
631 | { | |
632 | (*__morecore) (-size); | |
633 | return NULL; | |
634 | } | |
635 | ||
636 | /* Is it big enough to record status for its own space? | |
637 | If so, we win. */ | |
638 | if ((__malloc_size_t) BLOCK ((char *) newinfo | |
639 | + newsize * sizeof (malloc_info)) | |
640 | < newsize) | |
641 | break; | |
642 | ||
643 | /* Must try again. First give back most of what we just got. */ | |
644 | (*__morecore) (- newsize * sizeof (malloc_info)); | |
645 | newsize *= 2; | |
646 | } | |
647 | ||
648 | /* Copy the old table to the beginning of the new, | |
649 | and zero the rest of the new table. */ | |
650 | memcpy (newinfo, _heapinfo, heapsize * sizeof (malloc_info)); | |
651 | memset (&newinfo[heapsize], 0, | |
652 | (newsize - heapsize) * sizeof (malloc_info)); | |
653 | oldinfo = _heapinfo; | |
654 | _heapinfo = newinfo; | |
655 | heapsize = newsize; | |
656 | ||
657 | register_heapinfo (); | |
658 | ||
659 | /* Reset _heaplimit so _free_internal never decides | |
660 | it can relocate or resize the info table. */ | |
661 | _heaplimit = 0; | |
662 | _free_internal (oldinfo); | |
5dcab13e | 663 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
664 | |
665 | /* The new heap limit includes the new table just allocated. */ | |
666 | _heaplimit = BLOCK ((char *) newinfo + heapsize * sizeof (malloc_info)); | |
667 | return result; | |
668 | } | |
669 | ||
670 | got_heap: | |
671 | _heaplimit = BLOCK ((char *) result + size); | |
672 | return result; | |
673 | } | |
674 | ||
675 | /* Allocate memory from the heap. */ | |
676 | __ptr_t | |
677 | _malloc_internal (size) | |
678 | __malloc_size_t size; | |
679 | { | |
680 | __ptr_t result; | |
681 | __malloc_size_t block, blocks, lastblocks, start; | |
682 | register __malloc_size_t i; | |
683 | struct list *next; | |
684 | ||
685 | /* ANSI C allows `malloc (0)' to either return NULL, or to return a | |
686 | valid address you can realloc and free (though not dereference). | |
687 | ||
688 | It turns out that some extant code (sunrpc, at least Ultrix's version) | |
689 | expects `malloc (0)' to return non-NULL and breaks otherwise. | |
690 | Be compatible. */ | |
691 | ||
692 | #if 0 | |
693 | if (size == 0) | |
694 | return NULL; | |
695 | #endif | |
696 | ||
5dcab13e GM |
697 | PROTECT_MALLOC_STATE (0); |
698 | ||
74ad5c7f KH |
699 | if (size < sizeof (struct list)) |
700 | size = sizeof (struct list); | |
701 | ||
702 | #ifdef SUNOS_LOCALTIME_BUG | |
703 | if (size < 16) | |
704 | size = 16; | |
705 | #endif | |
706 | ||
707 | /* Determine the allocation policy based on the request size. */ | |
708 | if (size <= BLOCKSIZE / 2) | |
709 | { | |
710 | /* Small allocation to receive a fragment of a block. | |
711 | Determine the logarithm to base two of the fragment size. */ | |
712 | register __malloc_size_t log = 1; | |
713 | --size; | |
714 | while ((size /= 2) != 0) | |
715 | ++log; | |
716 | ||
717 | /* Look in the fragment lists for a | |
718 | free fragment of the desired size. */ | |
719 | next = _fraghead[log].next; | |
720 | if (next != NULL) | |
721 | { | |
722 | /* There are free fragments of this size. | |
723 | Pop a fragment out of the fragment list and return it. | |
724 | Update the block's nfree and first counters. */ | |
725 | result = (__ptr_t) next; | |
726 | next->prev->next = next->next; | |
727 | if (next->next != NULL) | |
728 | next->next->prev = next->prev; | |
729 | block = BLOCK (result); | |
730 | if (--_heapinfo[block].busy.info.frag.nfree != 0) | |
731 | _heapinfo[block].busy.info.frag.first = (unsigned long int) | |
732 | ((unsigned long int) ((char *) next->next - (char *) NULL) | |
733 | % BLOCKSIZE) >> log; | |
734 | ||
735 | /* Update the statistics. */ | |
736 | ++_chunks_used; | |
737 | _bytes_used += 1 << log; | |
738 | --_chunks_free; | |
739 | _bytes_free -= 1 << log; | |
740 | } | |
741 | else | |
742 | { | |
743 | /* No free fragments of the desired size, so get a new block | |
744 | and break it into fragments, returning the first. */ | |
8094989b GM |
745 | #ifdef GC_MALLOC_CHECK |
746 | result = _malloc_internal (BLOCKSIZE); | |
5dcab13e | 747 | PROTECT_MALLOC_STATE (0); |
8094989b | 748 | #else |
74ad5c7f | 749 | result = malloc (BLOCKSIZE); |
8094989b | 750 | #endif |
74ad5c7f | 751 | if (result == NULL) |
5dcab13e GM |
752 | { |
753 | PROTECT_MALLOC_STATE (1); | |
754 | return NULL; | |
755 | } | |
74ad5c7f KH |
756 | |
757 | /* Link all fragments but the first into the free list. */ | |
758 | next = (struct list *) ((char *) result + (1 << log)); | |
759 | next->next = NULL; | |
760 | next->prev = &_fraghead[log]; | |
761 | _fraghead[log].next = next; | |
762 | ||
763 | for (i = 2; i < (__malloc_size_t) (BLOCKSIZE >> log); ++i) | |
764 | { | |
765 | next = (struct list *) ((char *) result + (i << log)); | |
766 | next->next = _fraghead[log].next; | |
767 | next->prev = &_fraghead[log]; | |
768 | next->prev->next = next; | |
769 | next->next->prev = next; | |
770 | } | |
771 | ||
772 | /* Initialize the nfree and first counters for this block. */ | |
773 | block = BLOCK (result); | |
774 | _heapinfo[block].busy.type = log; | |
775 | _heapinfo[block].busy.info.frag.nfree = i - 1; | |
776 | _heapinfo[block].busy.info.frag.first = i - 1; | |
777 | ||
778 | _chunks_free += (BLOCKSIZE >> log) - 1; | |
779 | _bytes_free += BLOCKSIZE - (1 << log); | |
780 | _bytes_used -= BLOCKSIZE - (1 << log); | |
781 | } | |
782 | } | |
783 | else | |
784 | { | |
785 | /* Large allocation to receive one or more blocks. | |
786 | Search the free list in a circle starting at the last place visited. | |
787 | If we loop completely around without finding a large enough | |
788 | space we will have to get more memory from the system. */ | |
789 | blocks = BLOCKIFY (size); | |
790 | start = block = _heapindex; | |
791 | while (_heapinfo[block].free.size < blocks) | |
792 | { | |
793 | block = _heapinfo[block].free.next; | |
794 | if (block == start) | |
795 | { | |
796 | /* Need to get more from the system. Get a little extra. */ | |
797 | __malloc_size_t wantblocks = blocks + __malloc_extra_blocks; | |
798 | block = _heapinfo[0].free.prev; | |
799 | lastblocks = _heapinfo[block].free.size; | |
800 | /* Check to see if the new core will be contiguous with the | |
801 | final free block; if so we don't need to get as much. */ | |
802 | if (_heaplimit != 0 && block + lastblocks == _heaplimit && | |
803 | /* We can't do this if we will have to make the heap info | |
804 | table bigger to accomodate the new space. */ | |
805 | block + wantblocks <= heapsize && | |
806 | get_contiguous_space ((wantblocks - lastblocks) * BLOCKSIZE, | |
807 | ADDRESS (block + lastblocks))) | |
808 | { | |
809 | /* We got it contiguously. Which block we are extending | |
810 | (the `final free block' referred to above) might have | |
811 | changed, if it got combined with a freed info table. */ | |
812 | block = _heapinfo[0].free.prev; | |
813 | _heapinfo[block].free.size += (wantblocks - lastblocks); | |
814 | _bytes_free += (wantblocks - lastblocks) * BLOCKSIZE; | |
815 | _heaplimit += wantblocks - lastblocks; | |
816 | continue; | |
817 | } | |
818 | result = morecore (wantblocks * BLOCKSIZE); | |
819 | if (result == NULL) | |
820 | return NULL; | |
821 | block = BLOCK (result); | |
822 | /* Put the new block at the end of the free list. */ | |
823 | _heapinfo[block].free.size = wantblocks; | |
824 | _heapinfo[block].free.prev = _heapinfo[0].free.prev; | |
825 | _heapinfo[block].free.next = 0; | |
826 | _heapinfo[0].free.prev = block; | |
827 | _heapinfo[_heapinfo[block].free.prev].free.next = block; | |
828 | ++_chunks_free; | |
829 | /* Now loop to use some of that block for this allocation. */ | |
830 | } | |
831 | } | |
832 | ||
833 | /* At this point we have found a suitable free list entry. | |
834 | Figure out how to remove what we need from the list. */ | |
835 | result = ADDRESS (block); | |
836 | if (_heapinfo[block].free.size > blocks) | |
837 | { | |
838 | /* The block we found has a bit left over, | |
839 | so relink the tail end back into the free list. */ | |
840 | _heapinfo[block + blocks].free.size | |
841 | = _heapinfo[block].free.size - blocks; | |
842 | _heapinfo[block + blocks].free.next | |
843 | = _heapinfo[block].free.next; | |
844 | _heapinfo[block + blocks].free.prev | |
845 | = _heapinfo[block].free.prev; | |
846 | _heapinfo[_heapinfo[block].free.prev].free.next | |
847 | = _heapinfo[_heapinfo[block].free.next].free.prev | |
848 | = _heapindex = block + blocks; | |
849 | } | |
850 | else | |
851 | { | |
852 | /* The block exactly matches our requirements, | |
853 | so just remove it from the list. */ | |
854 | _heapinfo[_heapinfo[block].free.next].free.prev | |
855 | = _heapinfo[block].free.prev; | |
856 | _heapinfo[_heapinfo[block].free.prev].free.next | |
857 | = _heapindex = _heapinfo[block].free.next; | |
858 | --_chunks_free; | |
859 | } | |
860 | ||
861 | _heapinfo[block].busy.type = 0; | |
862 | _heapinfo[block].busy.info.size = blocks; | |
863 | ++_chunks_used; | |
864 | _bytes_used += blocks * BLOCKSIZE; | |
865 | _bytes_free -= blocks * BLOCKSIZE; | |
866 | ||
867 | /* Mark all the blocks of the object just allocated except for the | |
868 | first with a negative number so you can find the first block by | |
869 | adding that adjustment. */ | |
870 | while (--blocks > 0) | |
871 | _heapinfo[block + blocks].busy.info.size = -blocks; | |
872 | } | |
873 | ||
5dcab13e | 874 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
875 | return result; |
876 | } | |
877 | ||
878 | __ptr_t | |
879 | malloc (size) | |
880 | __malloc_size_t size; | |
881 | { | |
882 | if (!__malloc_initialized && !__malloc_initialize ()) | |
883 | return NULL; | |
884 | ||
885 | return (__malloc_hook != NULL ? *__malloc_hook : _malloc_internal) (size); | |
886 | } | |
887 | \f | |
888 | #ifndef _LIBC | |
889 | ||
890 | /* On some ANSI C systems, some libc functions call _malloc, _free | |
891 | and _realloc. Make them use the GNU functions. */ | |
892 | ||
893 | __ptr_t | |
894 | _malloc (size) | |
895 | __malloc_size_t size; | |
896 | { | |
897 | return malloc (size); | |
898 | } | |
899 | ||
900 | void | |
901 | _free (ptr) | |
902 | __ptr_t ptr; | |
903 | { | |
904 | free (ptr); | |
905 | } | |
906 | ||
907 | __ptr_t | |
908 | _realloc (ptr, size) | |
909 | __ptr_t ptr; | |
910 | __malloc_size_t size; | |
911 | { | |
912 | return realloc (ptr, size); | |
913 | } | |
914 | ||
915 | #endif | |
916 | /* Free a block of memory allocated by `malloc'. | |
917 | Copyright 1990, 1991, 1992, 1994, 1995 Free Software Foundation, Inc. | |
918 | Written May 1989 by Mike Haertel. | |
919 | ||
920 | This library is free software; you can redistribute it and/or | |
921 | modify it under the terms of the GNU Library General Public License as | |
922 | published by the Free Software Foundation; either version 2 of the | |
923 | License, or (at your option) any later version. | |
924 | ||
925 | This library is distributed in the hope that it will be useful, | |
926 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
927 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
928 | Library General Public License for more details. | |
929 | ||
930 | You should have received a copy of the GNU Library General Public | |
931 | License along with this library; see the file COPYING.LIB. If | |
932 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
933 | Cambridge, MA 02139, USA. | |
934 | ||
935 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
936 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
937 | ||
938 | #ifndef _MALLOC_INTERNAL | |
939 | #define _MALLOC_INTERNAL | |
940 | #include <malloc.h> | |
941 | #endif | |
942 | ||
943 | ||
944 | /* Cope with systems lacking `memmove'. */ | |
945 | #ifndef memmove | |
946 | #if (defined (MEMMOVE_MISSING) || \ | |
947 | !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG)) | |
948 | #ifdef emacs | |
949 | #undef __malloc_safe_bcopy | |
950 | #define __malloc_safe_bcopy safe_bcopy | |
951 | #endif | |
952 | /* This function is defined in realloc.c. */ | |
0a27e8ed | 953 | extern void __malloc_safe_bcopy PP ((__ptr_t, __ptr_t, __malloc_size_t)); |
74ad5c7f KH |
954 | #define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size)) |
955 | #endif | |
956 | #endif | |
957 | ||
958 | ||
959 | /* Debugging hook for free. */ | |
0a27e8ed | 960 | void (*__free_hook) PP ((__ptr_t __ptr)); |
74ad5c7f KH |
961 | |
962 | /* List of blocks allocated by memalign. */ | |
963 | struct alignlist *_aligned_blocks = NULL; | |
964 | ||
965 | /* Return memory to the heap. | |
966 | Like `free' but don't call a __free_hook if there is one. */ | |
967 | void | |
968 | _free_internal (ptr) | |
969 | __ptr_t ptr; | |
970 | { | |
971 | int type; | |
972 | __malloc_size_t block, blocks; | |
973 | register __malloc_size_t i; | |
974 | struct list *prev, *next; | |
975 | __ptr_t curbrk; | |
976 | const __malloc_size_t lesscore_threshold | |
977 | /* Threshold of free space at which we will return some to the system. */ | |
978 | = FINAL_FREE_BLOCKS + 2 * __malloc_extra_blocks; | |
979 | ||
980 | register struct alignlist *l; | |
981 | ||
982 | if (ptr == NULL) | |
983 | return; | |
984 | ||
5dcab13e GM |
985 | PROTECT_MALLOC_STATE (0); |
986 | ||
74ad5c7f KH |
987 | for (l = _aligned_blocks; l != NULL; l = l->next) |
988 | if (l->aligned == ptr) | |
989 | { | |
990 | l->aligned = NULL; /* Mark the slot in the list as free. */ | |
991 | ptr = l->exact; | |
992 | break; | |
993 | } | |
994 | ||
995 | block = BLOCK (ptr); | |
996 | ||
997 | type = _heapinfo[block].busy.type; | |
998 | switch (type) | |
999 | { | |
1000 | case 0: | |
1001 | /* Get as many statistics as early as we can. */ | |
1002 | --_chunks_used; | |
1003 | _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE; | |
1004 | _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE; | |
1005 | ||
1006 | /* Find the free cluster previous to this one in the free list. | |
1007 | Start searching at the last block referenced; this may benefit | |
1008 | programs with locality of allocation. */ | |
1009 | i = _heapindex; | |
1010 | if (i > block) | |
1011 | while (i > block) | |
1012 | i = _heapinfo[i].free.prev; | |
1013 | else | |
1014 | { | |
1015 | do | |
1016 | i = _heapinfo[i].free.next; | |
1017 | while (i > 0 && i < block); | |
1018 | i = _heapinfo[i].free.prev; | |
1019 | } | |
1020 | ||
1021 | /* Determine how to link this block into the free list. */ | |
1022 | if (block == i + _heapinfo[i].free.size) | |
1023 | { | |
1024 | /* Coalesce this block with its predecessor. */ | |
1025 | _heapinfo[i].free.size += _heapinfo[block].busy.info.size; | |
1026 | block = i; | |
1027 | } | |
1028 | else | |
1029 | { | |
1030 | /* Really link this block back into the free list. */ | |
1031 | _heapinfo[block].free.size = _heapinfo[block].busy.info.size; | |
1032 | _heapinfo[block].free.next = _heapinfo[i].free.next; | |
1033 | _heapinfo[block].free.prev = i; | |
1034 | _heapinfo[i].free.next = block; | |
1035 | _heapinfo[_heapinfo[block].free.next].free.prev = block; | |
1036 | ++_chunks_free; | |
1037 | } | |
1038 | ||
1039 | /* Now that the block is linked in, see if we can coalesce it | |
1040 | with its successor (by deleting its successor from the list | |
1041 | and adding in its size). */ | |
1042 | if (block + _heapinfo[block].free.size == _heapinfo[block].free.next) | |
1043 | { | |
1044 | _heapinfo[block].free.size | |
1045 | += _heapinfo[_heapinfo[block].free.next].free.size; | |
1046 | _heapinfo[block].free.next | |
1047 | = _heapinfo[_heapinfo[block].free.next].free.next; | |
1048 | _heapinfo[_heapinfo[block].free.next].free.prev = block; | |
1049 | --_chunks_free; | |
1050 | } | |
1051 | ||
1052 | /* How many trailing free blocks are there now? */ | |
1053 | blocks = _heapinfo[block].free.size; | |
1054 | ||
1055 | /* Where is the current end of accessible core? */ | |
1056 | curbrk = (*__morecore) (0); | |
1057 | ||
1058 | if (_heaplimit != 0 && curbrk == ADDRESS (_heaplimit)) | |
1059 | { | |
1060 | /* The end of the malloc heap is at the end of accessible core. | |
1061 | It's possible that moving _heapinfo will allow us to | |
1062 | return some space to the system. */ | |
1063 | ||
1064 | __malloc_size_t info_block = BLOCK (_heapinfo); | |
1065 | __malloc_size_t info_blocks = _heapinfo[info_block].busy.info.size; | |
1066 | __malloc_size_t prev_block = _heapinfo[block].free.prev; | |
1067 | __malloc_size_t prev_blocks = _heapinfo[prev_block].free.size; | |
1068 | __malloc_size_t next_block = _heapinfo[block].free.next; | |
1069 | __malloc_size_t next_blocks = _heapinfo[next_block].free.size; | |
1070 | ||
1071 | if (/* Win if this block being freed is last in core, the info table | |
1072 | is just before it, the previous free block is just before the | |
1073 | info table, and the two free blocks together form a useful | |
1074 | amount to return to the system. */ | |
1075 | (block + blocks == _heaplimit && | |
1076 | info_block + info_blocks == block && | |
1077 | prev_block != 0 && prev_block + prev_blocks == info_block && | |
1078 | blocks + prev_blocks >= lesscore_threshold) || | |
1079 | /* Nope, not the case. We can also win if this block being | |
1080 | freed is just before the info table, and the table extends | |
1081 | to the end of core or is followed only by a free block, | |
1082 | and the total free space is worth returning to the system. */ | |
1083 | (block + blocks == info_block && | |
1084 | ((info_block + info_blocks == _heaplimit && | |
1085 | blocks >= lesscore_threshold) || | |
1086 | (info_block + info_blocks == next_block && | |
1087 | next_block + next_blocks == _heaplimit && | |
1088 | blocks + next_blocks >= lesscore_threshold))) | |
1089 | ) | |
1090 | { | |
1091 | malloc_info *newinfo; | |
1092 | __malloc_size_t oldlimit = _heaplimit; | |
1093 | ||
1094 | /* Free the old info table, clearing _heaplimit to avoid | |
1095 | recursion into this code. We don't want to return the | |
1096 | table's blocks to the system before we have copied them to | |
1097 | the new location. */ | |
1098 | _heaplimit = 0; | |
1099 | _free_internal (_heapinfo); | |
1100 | _heaplimit = oldlimit; | |
1101 | ||
1102 | /* Tell malloc to search from the beginning of the heap for | |
1103 | free blocks, so it doesn't reuse the ones just freed. */ | |
1104 | _heapindex = 0; | |
1105 | ||
1106 | /* Allocate new space for the info table and move its data. */ | |
1107 | newinfo = (malloc_info *) _malloc_internal (info_blocks | |
1108 | * BLOCKSIZE); | |
5dcab13e | 1109 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
1110 | memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE); |
1111 | _heapinfo = newinfo; | |
1112 | ||
1113 | /* We should now have coalesced the free block with the | |
1114 | blocks freed from the old info table. Examine the entire | |
1115 | trailing free block to decide below whether to return some | |
1116 | to the system. */ | |
1117 | block = _heapinfo[0].free.prev; | |
1118 | blocks = _heapinfo[block].free.size; | |
1119 | } | |
1120 | ||
1121 | /* Now see if we can return stuff to the system. */ | |
1122 | if (block + blocks == _heaplimit && blocks >= lesscore_threshold) | |
1123 | { | |
1124 | register __malloc_size_t bytes = blocks * BLOCKSIZE; | |
1125 | _heaplimit -= blocks; | |
1126 | (*__morecore) (-bytes); | |
1127 | _heapinfo[_heapinfo[block].free.prev].free.next | |
1128 | = _heapinfo[block].free.next; | |
1129 | _heapinfo[_heapinfo[block].free.next].free.prev | |
1130 | = _heapinfo[block].free.prev; | |
1131 | block = _heapinfo[block].free.prev; | |
1132 | --_chunks_free; | |
1133 | _bytes_free -= bytes; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | /* Set the next search to begin at this block. */ | |
1138 | _heapindex = block; | |
1139 | break; | |
1140 | ||
1141 | default: | |
1142 | /* Do some of the statistics. */ | |
1143 | --_chunks_used; | |
1144 | _bytes_used -= 1 << type; | |
1145 | ++_chunks_free; | |
1146 | _bytes_free += 1 << type; | |
1147 | ||
1148 | /* Get the address of the first free fragment in this block. */ | |
1149 | prev = (struct list *) ((char *) ADDRESS (block) + | |
1150 | (_heapinfo[block].busy.info.frag.first << type)); | |
1151 | ||
1152 | if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1) | |
1153 | { | |
1154 | /* If all fragments of this block are free, remove them | |
1155 | from the fragment list and free the whole block. */ | |
1156 | next = prev; | |
1157 | for (i = 1; i < (__malloc_size_t) (BLOCKSIZE >> type); ++i) | |
1158 | next = next->next; | |
1159 | prev->prev->next = next; | |
1160 | if (next != NULL) | |
1161 | next->prev = prev->prev; | |
1162 | _heapinfo[block].busy.type = 0; | |
1163 | _heapinfo[block].busy.info.size = 1; | |
1164 | ||
1165 | /* Keep the statistics accurate. */ | |
1166 | ++_chunks_used; | |
1167 | _bytes_used += BLOCKSIZE; | |
1168 | _chunks_free -= BLOCKSIZE >> type; | |
1169 | _bytes_free -= BLOCKSIZE; | |
1170 | ||
8094989b GM |
1171 | #ifdef GC_MALLOC_CHECK |
1172 | _free_internal (ADDRESS (block)); | |
1173 | #else | |
74ad5c7f | 1174 | free (ADDRESS (block)); |
8094989b | 1175 | #endif |
74ad5c7f KH |
1176 | } |
1177 | else if (_heapinfo[block].busy.info.frag.nfree != 0) | |
1178 | { | |
1179 | /* If some fragments of this block are free, link this | |
1180 | fragment into the fragment list after the first free | |
1181 | fragment of this block. */ | |
1182 | next = (struct list *) ptr; | |
1183 | next->next = prev->next; | |
1184 | next->prev = prev; | |
1185 | prev->next = next; | |
1186 | if (next->next != NULL) | |
1187 | next->next->prev = next; | |
1188 | ++_heapinfo[block].busy.info.frag.nfree; | |
1189 | } | |
1190 | else | |
1191 | { | |
1192 | /* No fragments of this block are free, so link this | |
1193 | fragment into the fragment list and announce that | |
1194 | it is the first free fragment of this block. */ | |
1195 | prev = (struct list *) ptr; | |
1196 | _heapinfo[block].busy.info.frag.nfree = 1; | |
1197 | _heapinfo[block].busy.info.frag.first = (unsigned long int) | |
1198 | ((unsigned long int) ((char *) ptr - (char *) NULL) | |
1199 | % BLOCKSIZE >> type); | |
1200 | prev->next = _fraghead[type].next; | |
1201 | prev->prev = &_fraghead[type]; | |
1202 | prev->prev->next = prev; | |
1203 | if (prev->next != NULL) | |
1204 | prev->next->prev = prev; | |
1205 | } | |
1206 | break; | |
1207 | } | |
5dcab13e GM |
1208 | |
1209 | PROTECT_MALLOC_STATE (1); | |
74ad5c7f KH |
1210 | } |
1211 | ||
1212 | /* Return memory to the heap. */ | |
ca9c0567 PE |
1213 | |
1214 | FREE_RETURN_TYPE | |
74ad5c7f KH |
1215 | free (ptr) |
1216 | __ptr_t ptr; | |
1217 | { | |
1218 | if (__free_hook != NULL) | |
1219 | (*__free_hook) (ptr); | |
1220 | else | |
1221 | _free_internal (ptr); | |
1222 | } | |
1223 | ||
1224 | /* Define the `cfree' alias for `free'. */ | |
1225 | #ifdef weak_alias | |
1226 | weak_alias (free, cfree) | |
1227 | #else | |
1228 | void | |
1229 | cfree (ptr) | |
1230 | __ptr_t ptr; | |
1231 | { | |
1232 | free (ptr); | |
1233 | } | |
1234 | #endif | |
1235 | /* Change the size of a block allocated by `malloc'. | |
1236 | Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
1237 | Written May 1989 by Mike Haertel. | |
1238 | ||
1239 | This library is free software; you can redistribute it and/or | |
1240 | modify it under the terms of the GNU Library General Public License as | |
1241 | published by the Free Software Foundation; either version 2 of the | |
1242 | License, or (at your option) any later version. | |
1243 | ||
1244 | This library is distributed in the hope that it will be useful, | |
1245 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1246 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1247 | Library General Public License for more details. | |
1248 | ||
1249 | You should have received a copy of the GNU Library General Public | |
1250 | License along with this library; see the file COPYING.LIB. If | |
1251 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1252 | Cambridge, MA 02139, USA. | |
1253 | ||
1254 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1255 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1256 | ||
1257 | #ifndef _MALLOC_INTERNAL | |
1258 | #define _MALLOC_INTERNAL | |
1259 | #include <malloc.h> | |
1260 | #endif | |
1261 | ||
1262 | ||
1263 | ||
1264 | /* Cope with systems lacking `memmove'. */ | |
1265 | #if (defined (MEMMOVE_MISSING) || \ | |
1266 | !defined(_LIBC) && !defined(STDC_HEADERS) && !defined(USG)) | |
1267 | ||
1268 | #ifdef emacs | |
1269 | #undef __malloc_safe_bcopy | |
1270 | #define __malloc_safe_bcopy safe_bcopy | |
1271 | #else | |
1272 | ||
1273 | /* Snarfed directly from Emacs src/dispnew.c: | |
1274 | XXX Should use system bcopy if it handles overlap. */ | |
1275 | ||
1276 | /* Like bcopy except never gets confused by overlap. */ | |
1277 | ||
1278 | void | |
1279 | __malloc_safe_bcopy (afrom, ato, size) | |
1280 | __ptr_t afrom; | |
1281 | __ptr_t ato; | |
1282 | __malloc_size_t size; | |
1283 | { | |
1284 | char *from = afrom, *to = ato; | |
1285 | ||
1286 | if (size <= 0 || from == to) | |
1287 | return; | |
1288 | ||
1289 | /* If the source and destination don't overlap, then bcopy can | |
1290 | handle it. If they do overlap, but the destination is lower in | |
1291 | memory than the source, we'll assume bcopy can handle that. */ | |
1292 | if (to < from || from + size <= to) | |
1293 | bcopy (from, to, size); | |
1294 | ||
1295 | /* Otherwise, we'll copy from the end. */ | |
1296 | else | |
1297 | { | |
1298 | register char *endf = from + size; | |
1299 | register char *endt = to + size; | |
1300 | ||
1301 | /* If TO - FROM is large, then we should break the copy into | |
1302 | nonoverlapping chunks of TO - FROM bytes each. However, if | |
1303 | TO - FROM is small, then the bcopy function call overhead | |
1304 | makes this not worth it. The crossover point could be about | |
1305 | anywhere. Since I don't think the obvious copy loop is too | |
1306 | bad, I'm trying to err in its favor. */ | |
1307 | if (to - from < 64) | |
1308 | { | |
1309 | do | |
1310 | *--endt = *--endf; | |
1311 | while (endf != from); | |
1312 | } | |
1313 | else | |
1314 | { | |
1315 | for (;;) | |
1316 | { | |
1317 | endt -= (to - from); | |
1318 | endf -= (to - from); | |
1319 | ||
1320 | if (endt < to) | |
1321 | break; | |
1322 | ||
1323 | bcopy (endf, endt, to - from); | |
1324 | } | |
1325 | ||
1326 | /* If SIZE wasn't a multiple of TO - FROM, there will be a | |
1327 | little left over. The amount left over is | |
1328 | (endt + (to - from)) - to, which is endt - from. */ | |
1329 | bcopy (from, to, endt - from); | |
1330 | } | |
1331 | } | |
1332 | } | |
1333 | #endif /* emacs */ | |
1334 | ||
1335 | #ifndef memmove | |
0a27e8ed | 1336 | extern void __malloc_safe_bcopy PP ((__ptr_t, __ptr_t, __malloc_size_t)); |
74ad5c7f KH |
1337 | #define memmove(to, from, size) __malloc_safe_bcopy ((from), (to), (size)) |
1338 | #endif | |
1339 | ||
1340 | #endif | |
1341 | ||
1342 | ||
1343 | #define min(A, B) ((A) < (B) ? (A) : (B)) | |
1344 | ||
1345 | /* Debugging hook for realloc. */ | |
0a27e8ed | 1346 | __ptr_t (*__realloc_hook) PP ((__ptr_t __ptr, __malloc_size_t __size)); |
74ad5c7f KH |
1347 | |
1348 | /* Resize the given region to the new size, returning a pointer | |
1349 | to the (possibly moved) region. This is optimized for speed; | |
1350 | some benchmarks seem to indicate that greater compactness is | |
1351 | achieved by unconditionally allocating and copying to a | |
1352 | new region. This module has incestuous knowledge of the | |
1353 | internals of both free and malloc. */ | |
1354 | __ptr_t | |
1355 | _realloc_internal (ptr, size) | |
1356 | __ptr_t ptr; | |
1357 | __malloc_size_t size; | |
1358 | { | |
1359 | __ptr_t result; | |
1360 | int type; | |
1361 | __malloc_size_t block, blocks, oldlimit; | |
1362 | ||
1363 | if (size == 0) | |
1364 | { | |
1365 | _free_internal (ptr); | |
1366 | return _malloc_internal (0); | |
1367 | } | |
1368 | else if (ptr == NULL) | |
1369 | return _malloc_internal (size); | |
1370 | ||
1371 | block = BLOCK (ptr); | |
1372 | ||
5dcab13e GM |
1373 | PROTECT_MALLOC_STATE (0); |
1374 | ||
74ad5c7f KH |
1375 | type = _heapinfo[block].busy.type; |
1376 | switch (type) | |
1377 | { | |
1378 | case 0: | |
1379 | /* Maybe reallocate a large block to a small fragment. */ | |
1380 | if (size <= BLOCKSIZE / 2) | |
1381 | { | |
1382 | result = _malloc_internal (size); | |
1383 | if (result != NULL) | |
1384 | { | |
1385 | memcpy (result, ptr, size); | |
1386 | _free_internal (ptr); | |
1387 | return result; | |
1388 | } | |
1389 | } | |
1390 | ||
1391 | /* The new size is a large allocation as well; | |
1392 | see if we can hold it in place. */ | |
1393 | blocks = BLOCKIFY (size); | |
1394 | if (blocks < _heapinfo[block].busy.info.size) | |
1395 | { | |
1396 | /* The new size is smaller; return | |
1397 | excess memory to the free list. */ | |
1398 | _heapinfo[block + blocks].busy.type = 0; | |
1399 | _heapinfo[block + blocks].busy.info.size | |
1400 | = _heapinfo[block].busy.info.size - blocks; | |
1401 | _heapinfo[block].busy.info.size = blocks; | |
1402 | /* We have just created a new chunk by splitting a chunk in two. | |
1403 | Now we will free this chunk; increment the statistics counter | |
1404 | so it doesn't become wrong when _free_internal decrements it. */ | |
1405 | ++_chunks_used; | |
1406 | _free_internal (ADDRESS (block + blocks)); | |
1407 | result = ptr; | |
1408 | } | |
1409 | else if (blocks == _heapinfo[block].busy.info.size) | |
1410 | /* No size change necessary. */ | |
1411 | result = ptr; | |
1412 | else | |
1413 | { | |
1414 | /* Won't fit, so allocate a new region that will. | |
1415 | Free the old region first in case there is sufficient | |
1416 | adjacent free space to grow without moving. */ | |
1417 | blocks = _heapinfo[block].busy.info.size; | |
1418 | /* Prevent free from actually returning memory to the system. */ | |
1419 | oldlimit = _heaplimit; | |
1420 | _heaplimit = 0; | |
1421 | _free_internal (ptr); | |
1422 | result = _malloc_internal (size); | |
5dcab13e | 1423 | PROTECT_MALLOC_STATE (0); |
74ad5c7f KH |
1424 | if (_heaplimit == 0) |
1425 | _heaplimit = oldlimit; | |
1426 | if (result == NULL) | |
1427 | { | |
1428 | /* Now we're really in trouble. We have to unfree | |
1429 | the thing we just freed. Unfortunately it might | |
1430 | have been coalesced with its neighbors. */ | |
1431 | if (_heapindex == block) | |
1432 | (void) _malloc_internal (blocks * BLOCKSIZE); | |
1433 | else | |
1434 | { | |
1435 | __ptr_t previous | |
1436 | = _malloc_internal ((block - _heapindex) * BLOCKSIZE); | |
1437 | (void) _malloc_internal (blocks * BLOCKSIZE); | |
1438 | _free_internal (previous); | |
1439 | } | |
1440 | return NULL; | |
1441 | } | |
1442 | if (ptr != result) | |
1443 | memmove (result, ptr, blocks * BLOCKSIZE); | |
1444 | } | |
1445 | break; | |
1446 | ||
1447 | default: | |
1448 | /* Old size is a fragment; type is logarithm | |
1449 | to base two of the fragment size. */ | |
1450 | if (size > (__malloc_size_t) (1 << (type - 1)) && | |
1451 | size <= (__malloc_size_t) (1 << type)) | |
1452 | /* The new size is the same kind of fragment. */ | |
1453 | result = ptr; | |
1454 | else | |
1455 | { | |
1456 | /* The new size is different; allocate a new space, | |
1457 | and copy the lesser of the new size and the old. */ | |
1458 | result = _malloc_internal (size); | |
1459 | if (result == NULL) | |
1460 | return NULL; | |
1461 | memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type)); | |
1462 | _free_internal (ptr); | |
1463 | } | |
1464 | break; | |
1465 | } | |
1466 | ||
5dcab13e | 1467 | PROTECT_MALLOC_STATE (1); |
74ad5c7f KH |
1468 | return result; |
1469 | } | |
1470 | ||
1471 | __ptr_t | |
1472 | realloc (ptr, size) | |
1473 | __ptr_t ptr; | |
1474 | __malloc_size_t size; | |
1475 | { | |
1476 | if (!__malloc_initialized && !__malloc_initialize ()) | |
1477 | return NULL; | |
1478 | ||
1479 | return (__realloc_hook != NULL ? *__realloc_hook : _realloc_internal) | |
1480 | (ptr, size); | |
1481 | } | |
1482 | /* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc. | |
1483 | ||
1484 | This library is free software; you can redistribute it and/or | |
1485 | modify it under the terms of the GNU Library General Public License as | |
1486 | published by the Free Software Foundation; either version 2 of the | |
1487 | License, or (at your option) any later version. | |
1488 | ||
1489 | This library is distributed in the hope that it will be useful, | |
1490 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1491 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1492 | Library General Public License for more details. | |
1493 | ||
1494 | You should have received a copy of the GNU Library General Public | |
1495 | License along with this library; see the file COPYING.LIB. If | |
1496 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1497 | Cambridge, MA 02139, USA. | |
1498 | ||
1499 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1500 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1501 | ||
1502 | #ifndef _MALLOC_INTERNAL | |
1503 | #define _MALLOC_INTERNAL | |
1504 | #include <malloc.h> | |
1505 | #endif | |
1506 | ||
1507 | /* Allocate an array of NMEMB elements each SIZE bytes long. | |
1508 | The entire array is initialized to zeros. */ | |
1509 | __ptr_t | |
1510 | calloc (nmemb, size) | |
1511 | register __malloc_size_t nmemb; | |
1512 | register __malloc_size_t size; | |
1513 | { | |
1514 | register __ptr_t result = malloc (nmemb * size); | |
1515 | ||
1516 | if (result != NULL) | |
1517 | (void) memset (result, 0, nmemb * size); | |
1518 | ||
1519 | return result; | |
1520 | } | |
1521 | /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
1522 | This file is part of the GNU C Library. | |
1523 | ||
1524 | The GNU C Library is free software; you can redistribute it and/or modify | |
1525 | it under the terms of the GNU General Public License as published by | |
1526 | the Free Software Foundation; either version 2, or (at your option) | |
1527 | any later version. | |
1528 | ||
1529 | The GNU C Library is distributed in the hope that it will be useful, | |
1530 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1531 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1532 | GNU General Public License for more details. | |
1533 | ||
1534 | You should have received a copy of the GNU General Public License | |
1535 | along with the GNU C Library; see the file COPYING. If not, write to | |
1536 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
1537 | ||
1538 | #ifndef _MALLOC_INTERNAL | |
1539 | #define _MALLOC_INTERNAL | |
1540 | #include <malloc.h> | |
1541 | #endif | |
1542 | ||
1543 | #ifndef __GNU_LIBRARY__ | |
1544 | #define __sbrk sbrk | |
1545 | #endif | |
1546 | ||
1547 | #ifdef __GNU_LIBRARY__ | |
1548 | /* It is best not to declare this and cast its result on foreign operating | |
1549 | systems with potentially hostile include files. */ | |
1550 | ||
1551 | #include <stddef.h> | |
0a27e8ed | 1552 | extern __ptr_t __sbrk PP ((ptrdiff_t increment)); |
74ad5c7f KH |
1553 | #endif |
1554 | ||
1555 | #ifndef NULL | |
1556 | #define NULL 0 | |
1557 | #endif | |
1558 | ||
1559 | /* Allocate INCREMENT more bytes of data space, | |
1560 | and return the start of data space, or NULL on errors. | |
1561 | If INCREMENT is negative, shrink data space. */ | |
1562 | __ptr_t | |
1563 | __default_morecore (increment) | |
1564 | __malloc_ptrdiff_t increment; | |
1565 | { | |
1566 | __ptr_t result = (__ptr_t) __sbrk (increment); | |
1567 | if (result == (__ptr_t) -1) | |
1568 | return NULL; | |
1569 | return result; | |
1570 | } | |
1571 | /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. | |
1572 | ||
1573 | This library is free software; you can redistribute it and/or | |
1574 | modify it under the terms of the GNU Library General Public License as | |
1575 | published by the Free Software Foundation; either version 2 of the | |
1576 | License, or (at your option) any later version. | |
1577 | ||
1578 | This library is distributed in the hope that it will be useful, | |
1579 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1580 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1581 | Library General Public License for more details. | |
1582 | ||
1583 | You should have received a copy of the GNU Library General Public | |
1584 | License along with this library; see the file COPYING.LIB. If | |
1585 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1586 | Cambridge, MA 02139, USA. */ | |
1587 | ||
1588 | #ifndef _MALLOC_INTERNAL | |
1589 | #define _MALLOC_INTERNAL | |
1590 | #include <malloc.h> | |
1591 | #endif | |
1592 | ||
1593 | #if __DJGPP__ - 0 == 1 | |
1594 | ||
1595 | /* There is some problem with memalign in DJGPP v1 and we are supposed | |
1596 | to omit it. Noone told me why, they just told me to do it. */ | |
1597 | ||
1598 | #else | |
1599 | ||
0a27e8ed | 1600 | __ptr_t (*__memalign_hook) PP ((size_t __size, size_t __alignment)); |
74ad5c7f KH |
1601 | |
1602 | __ptr_t | |
1603 | memalign (alignment, size) | |
1604 | __malloc_size_t alignment; | |
1605 | __malloc_size_t size; | |
1606 | { | |
1607 | __ptr_t result; | |
1608 | unsigned long int adj, lastadj; | |
1609 | ||
1610 | if (__memalign_hook) | |
1611 | return (*__memalign_hook) (alignment, size); | |
1612 | ||
1613 | /* Allocate a block with enough extra space to pad the block with up to | |
1614 | (ALIGNMENT - 1) bytes if necessary. */ | |
1615 | result = malloc (size + alignment - 1); | |
1616 | if (result == NULL) | |
1617 | return NULL; | |
1618 | ||
1619 | /* Figure out how much we will need to pad this particular block | |
1620 | to achieve the required alignment. */ | |
1621 | adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment; | |
1622 | ||
1623 | do | |
1624 | { | |
1625 | /* Reallocate the block with only as much excess as it needs. */ | |
1626 | free (result); | |
1627 | result = malloc (adj + size); | |
1628 | if (result == NULL) /* Impossible unless interrupted. */ | |
1629 | return NULL; | |
1630 | ||
1631 | lastadj = adj; | |
1632 | adj = (unsigned long int) ((char *) result - (char *) NULL) % alignment; | |
1633 | /* It's conceivable we might have been so unlucky as to get a | |
1634 | different block with weaker alignment. If so, this block is too | |
1635 | short to contain SIZE after alignment correction. So we must | |
1636 | try again and get another block, slightly larger. */ | |
1637 | } while (adj > lastadj); | |
1638 | ||
1639 | if (adj != 0) | |
1640 | { | |
1641 | /* Record this block in the list of aligned blocks, so that `free' | |
1642 | can identify the pointer it is passed, which will be in the middle | |
1643 | of an allocated block. */ | |
1644 | ||
1645 | struct alignlist *l; | |
1646 | for (l = _aligned_blocks; l != NULL; l = l->next) | |
1647 | if (l->aligned == NULL) | |
1648 | /* This slot is free. Use it. */ | |
1649 | break; | |
1650 | if (l == NULL) | |
1651 | { | |
1652 | l = (struct alignlist *) malloc (sizeof (struct alignlist)); | |
1653 | if (l == NULL) | |
1654 | { | |
1655 | free (result); | |
1656 | return NULL; | |
1657 | } | |
1658 | l->next = _aligned_blocks; | |
1659 | _aligned_blocks = l; | |
1660 | } | |
1661 | l->exact = result; | |
1662 | result = l->aligned = (char *) result + alignment - adj; | |
1663 | } | |
1664 | ||
1665 | return result; | |
1666 | } | |
1667 | ||
1668 | #endif /* Not DJGPP v1 */ | |
1669 | /* Allocate memory on a page boundary. | |
1670 | Copyright (C) 1991, 92, 93, 94, 96 Free Software Foundation, Inc. | |
1671 | ||
1672 | This library is free software; you can redistribute it and/or | |
1673 | modify it under the terms of the GNU Library General Public License as | |
1674 | published by the Free Software Foundation; either version 2 of the | |
1675 | License, or (at your option) any later version. | |
1676 | ||
1677 | This library is distributed in the hope that it will be useful, | |
1678 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1679 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1680 | Library General Public License for more details. | |
1681 | ||
1682 | You should have received a copy of the GNU Library General Public | |
1683 | License along with this library; see the file COPYING.LIB. If | |
1684 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1685 | Cambridge, MA 02139, USA. | |
1686 | ||
1687 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1688 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1689 | ||
1690 | #if defined (_MALLOC_INTERNAL) && defined (GMALLOC_INHIBIT_VALLOC) | |
1691 | ||
1692 | /* Emacs defines GMALLOC_INHIBIT_VALLOC to avoid this definition | |
1693 | on MSDOS, where it conflicts with a system header file. */ | |
1694 | ||
1695 | #define ELIDE_VALLOC | |
1696 | ||
1697 | #endif | |
1698 | ||
1699 | #ifndef ELIDE_VALLOC | |
1700 | ||
1701 | #if defined (__GNU_LIBRARY__) || defined (_LIBC) | |
1702 | #include <stddef.h> | |
1703 | #include <sys/cdefs.h> | |
47582ab3 KH |
1704 | #if defined (__GLIBC__) && __GLIBC__ >= 2 |
1705 | /* __getpagesize is already declared in <unistd.h> with return type int */ | |
1706 | #else | |
0a27e8ed | 1707 | extern size_t __getpagesize PP ((void)); |
47582ab3 | 1708 | #endif |
74ad5c7f KH |
1709 | #else |
1710 | #include "getpagesize.h" | |
1711 | #define __getpagesize() getpagesize() | |
1712 | #endif | |
1713 | ||
1714 | #ifndef _MALLOC_INTERNAL | |
1715 | #define _MALLOC_INTERNAL | |
1716 | #include <malloc.h> | |
1717 | #endif | |
1718 | ||
1719 | static __malloc_size_t pagesize; | |
1720 | ||
1721 | __ptr_t | |
1722 | valloc (size) | |
1723 | __malloc_size_t size; | |
1724 | { | |
1725 | if (pagesize == 0) | |
1726 | pagesize = __getpagesize (); | |
1727 | ||
1728 | return memalign (pagesize, size); | |
1729 | } | |
1730 | ||
1731 | #endif /* Not ELIDE_VALLOC. */ | |
a3ba27da GM |
1732 | |
1733 | #ifdef GC_MCHECK | |
1734 | ||
1735 | /* Standard debugging hooks for `malloc'. | |
1736 | Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc. | |
1737 | Written May 1989 by Mike Haertel. | |
1738 | ||
1739 | This library is free software; you can redistribute it and/or | |
1740 | modify it under the terms of the GNU Library General Public License as | |
1741 | published by the Free Software Foundation; either version 2 of the | |
1742 | License, or (at your option) any later version. | |
1743 | ||
1744 | This library is distributed in the hope that it will be useful, | |
1745 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1746 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
1747 | Library General Public License for more details. | |
1748 | ||
1749 | You should have received a copy of the GNU Library General Public | |
1750 | License along with this library; see the file COPYING.LIB. If | |
1751 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
1752 | Cambridge, MA 02139, USA. | |
1753 | ||
1754 | The author may be reached (Email) at the address mike@ai.mit.edu, | |
1755 | or (US mail) as Mike Haertel c/o Free Software Foundation. */ | |
1756 | ||
1757 | #ifdef emacs | |
1758 | #include <stdio.h> | |
1759 | #else | |
1760 | #ifndef _MALLOC_INTERNAL | |
1761 | #define _MALLOC_INTERNAL | |
1762 | #include <malloc.h> | |
1763 | #include <stdio.h> | |
1764 | #endif | |
1765 | #endif | |
1766 | ||
1767 | /* Old hook values. */ | |
1768 | static void (*old_free_hook) __P ((__ptr_t ptr)); | |
1769 | static __ptr_t (*old_malloc_hook) __P ((__malloc_size_t size)); | |
1770 | static __ptr_t (*old_realloc_hook) __P ((__ptr_t ptr, __malloc_size_t size)); | |
1771 | ||
1772 | /* Function to call when something awful happens. */ | |
1773 | static void (*abortfunc) __P ((enum mcheck_status)); | |
1774 | ||
1775 | /* Arbitrary magical numbers. */ | |
1776 | #define MAGICWORD 0xfedabeeb | |
1777 | #define MAGICFREE 0xd8675309 | |
1778 | #define MAGICBYTE ((char) 0xd7) | |
1779 | #define MALLOCFLOOD ((char) 0x93) | |
1780 | #define FREEFLOOD ((char) 0x95) | |
1781 | ||
1782 | struct hdr | |
1783 | { | |
1784 | __malloc_size_t size; /* Exact size requested by user. */ | |
1785 | unsigned long int magic; /* Magic number to check header integrity. */ | |
1786 | }; | |
1787 | ||
1788 | #if defined(_LIBC) || defined(STDC_HEADERS) || defined(USG) | |
1789 | #define flood memset | |
1790 | #else | |
1791 | static void flood __P ((__ptr_t, int, __malloc_size_t)); | |
1792 | static void | |
1793 | flood (ptr, val, size) | |
1794 | __ptr_t ptr; | |
1795 | int val; | |
1796 | __malloc_size_t size; | |
1797 | { | |
1798 | char *cp = ptr; | |
1799 | while (size--) | |
1800 | *cp++ = val; | |
1801 | } | |
1802 | #endif | |
1803 | ||
1804 | static enum mcheck_status checkhdr __P ((const struct hdr *)); | |
1805 | static enum mcheck_status | |
1806 | checkhdr (hdr) | |
1807 | const struct hdr *hdr; | |
1808 | { | |
1809 | enum mcheck_status status; | |
1810 | switch (hdr->magic) | |
1811 | { | |
1812 | default: | |
1813 | status = MCHECK_HEAD; | |
1814 | break; | |
1815 | case MAGICFREE: | |
1816 | status = MCHECK_FREE; | |
1817 | break; | |
1818 | case MAGICWORD: | |
1819 | if (((char *) &hdr[1])[hdr->size] != MAGICBYTE) | |
1820 | status = MCHECK_TAIL; | |
1821 | else | |
1822 | status = MCHECK_OK; | |
1823 | break; | |
1824 | } | |
1825 | if (status != MCHECK_OK) | |
1826 | (*abortfunc) (status); | |
1827 | return status; | |
1828 | } | |
1829 | ||
1830 | static void freehook __P ((__ptr_t)); | |
1831 | static void | |
1832 | freehook (ptr) | |
1833 | __ptr_t ptr; | |
1834 | { | |
1835 | struct hdr *hdr; | |
1836 | ||
1837 | if (ptr) | |
1838 | { | |
1839 | hdr = ((struct hdr *) ptr) - 1; | |
1840 | checkhdr (hdr); | |
1841 | hdr->magic = MAGICFREE; | |
1842 | flood (ptr, FREEFLOOD, hdr->size); | |
1843 | } | |
1844 | else | |
1845 | hdr = NULL; | |
1846 | ||
1847 | __free_hook = old_free_hook; | |
1848 | free (hdr); | |
1849 | __free_hook = freehook; | |
1850 | } | |
1851 | ||
1852 | static __ptr_t mallochook __P ((__malloc_size_t)); | |
1853 | static __ptr_t | |
1854 | mallochook (size) | |
1855 | __malloc_size_t size; | |
1856 | { | |
1857 | struct hdr *hdr; | |
1858 | ||
1859 | __malloc_hook = old_malloc_hook; | |
1860 | hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1); | |
1861 | __malloc_hook = mallochook; | |
1862 | if (hdr == NULL) | |
1863 | return NULL; | |
1864 | ||
1865 | hdr->size = size; | |
1866 | hdr->magic = MAGICWORD; | |
1867 | ((char *) &hdr[1])[size] = MAGICBYTE; | |
1868 | flood ((__ptr_t) (hdr + 1), MALLOCFLOOD, size); | |
1869 | return (__ptr_t) (hdr + 1); | |
1870 | } | |
1871 | ||
1872 | static __ptr_t reallochook __P ((__ptr_t, __malloc_size_t)); | |
1873 | static __ptr_t | |
1874 | reallochook (ptr, size) | |
1875 | __ptr_t ptr; | |
1876 | __malloc_size_t size; | |
1877 | { | |
1878 | struct hdr *hdr = NULL; | |
1879 | __malloc_size_t osize = 0; | |
1880 | ||
1881 | if (ptr) | |
1882 | { | |
1883 | hdr = ((struct hdr *) ptr) - 1; | |
1884 | osize = hdr->size; | |
1885 | ||
1886 | checkhdr (hdr); | |
1887 | if (size < osize) | |
1888 | flood ((char *) ptr + size, FREEFLOOD, osize - size); | |
1889 | } | |
1890 | ||
1891 | __free_hook = old_free_hook; | |
1892 | __malloc_hook = old_malloc_hook; | |
1893 | __realloc_hook = old_realloc_hook; | |
1894 | hdr = (struct hdr *) realloc ((__ptr_t) hdr, sizeof (struct hdr) + size + 1); | |
1895 | __free_hook = freehook; | |
1896 | __malloc_hook = mallochook; | |
1897 | __realloc_hook = reallochook; | |
1898 | if (hdr == NULL) | |
1899 | return NULL; | |
1900 | ||
1901 | hdr->size = size; | |
1902 | hdr->magic = MAGICWORD; | |
1903 | ((char *) &hdr[1])[size] = MAGICBYTE; | |
1904 | if (size > osize) | |
1905 | flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize); | |
1906 | return (__ptr_t) (hdr + 1); | |
1907 | } | |
1908 | ||
1909 | static void | |
1910 | mabort (status) | |
1911 | enum mcheck_status status; | |
1912 | { | |
1913 | const char *msg; | |
1914 | switch (status) | |
1915 | { | |
1916 | case MCHECK_OK: | |
1917 | msg = "memory is consistent, library is buggy"; | |
1918 | break; | |
1919 | case MCHECK_HEAD: | |
1920 | msg = "memory clobbered before allocated block"; | |
1921 | break; | |
1922 | case MCHECK_TAIL: | |
1923 | msg = "memory clobbered past end of allocated block"; | |
1924 | break; | |
1925 | case MCHECK_FREE: | |
1926 | msg = "block freed twice"; | |
1927 | break; | |
1928 | default: | |
1929 | msg = "bogus mcheck_status, library is buggy"; | |
1930 | break; | |
1931 | } | |
1932 | #ifdef __GNU_LIBRARY__ | |
1933 | __libc_fatal (msg); | |
1934 | #else | |
1935 | fprintf (stderr, "mcheck: %s\n", msg); | |
1936 | fflush (stderr); | |
1937 | abort (); | |
1938 | #endif | |
1939 | } | |
1940 | ||
1941 | static int mcheck_used = 0; | |
1942 | ||
1943 | int | |
1944 | mcheck (func) | |
1945 | void (*func) __P ((enum mcheck_status)); | |
1946 | { | |
1947 | abortfunc = (func != NULL) ? func : &mabort; | |
1948 | ||
1949 | /* These hooks may not be safely inserted if malloc is already in use. */ | |
1950 | if (!__malloc_initialized && !mcheck_used) | |
1951 | { | |
1952 | old_free_hook = __free_hook; | |
1953 | __free_hook = freehook; | |
1954 | old_malloc_hook = __malloc_hook; | |
1955 | __malloc_hook = mallochook; | |
1956 | old_realloc_hook = __realloc_hook; | |
1957 | __realloc_hook = reallochook; | |
1958 | mcheck_used = 1; | |
1959 | } | |
1960 | ||
1961 | return mcheck_used ? 0 : -1; | |
1962 | } | |
1963 | ||
1964 | enum mcheck_status | |
1965 | mprobe (__ptr_t ptr) | |
1966 | { | |
1967 | return mcheck_used ? checkhdr (ptr) : MCHECK_DISABLED; | |
1968 | } | |
1969 | ||
1970 | #endif /* GC_MCHECK */ |