Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | /* malloc.c |
8d063cd8 | 2 | * |
8d063cd8 LW |
3 | */ |
4 | ||
87c6202a | 5 | /* |
4ac71550 TC |
6 | * 'The Chamber of Records,' said Gimli. 'I guess that is where we now stand.' |
7 | * | |
cdad3b53 | 8 | * [p.321 of _The Lord of the Rings_, II/v: "The Bridge of Khazad-Dûm"] |
d31a8517 AT |
9 | */ |
10 | ||
166f8a29 DM |
11 | /* This file contains Perl's own implementation of the malloc library. |
12 | * It is used if Configure decides that, on your platform, Perl's | |
13 | * version is better than the OS's, or if you give Configure the | |
14 | * -Dusemymalloc command-line option. | |
15 | */ | |
16 | ||
d31a8517 | 17 | /* |
741df71a IZ |
18 | Here are some notes on configuring Perl's malloc. (For non-perl |
19 | usage see below.) | |
87c6202a IZ |
20 | |
21 | There are two macros which serve as bulk disablers of advanced | |
22 | features of this malloc: NO_FANCY_MALLOC, PLAIN_MALLOC (undef by | |
23 | default). Look in the list of default values below to understand | |
24 | their exact effect. Defining NO_FANCY_MALLOC returns malloc.c to the | |
25 | state of the malloc in Perl 5.004. Additionally defining PLAIN_MALLOC | |
26 | returns it to the state as of Perl 5.000. | |
27 | ||
28 | Note that some of the settings below may be ignored in the code based | |
29 | on values of other macros. The PERL_CORE symbol is only defined when | |
30 | perl itself is being compiled (so malloc can make some assumptions | |
31 | about perl's facilities being available to it). | |
32 | ||
33 | Each config option has a short description, followed by its name, | |
34 | default value, and a comment about the default (if applicable). Some | |
35 | options take a precise value, while the others are just boolean. | |
36 | The boolean ones are listed first. | |
37 | ||
22f7c9c9 JH |
38 | # Read configuration settings from malloc_cfg.h |
39 | HAVE_MALLOC_CFG_H undef | |
40 | ||
87c6202a IZ |
41 | # Enable code for an emergency memory pool in $^M. See perlvar.pod |
42 | # for a description of $^M. | |
22f7c9c9 | 43 | PERL_EMERGENCY_SBRK (!PLAIN_MALLOC && (PERL_CORE || !NO_MALLOC_DYNAMIC_CFG)) |
87c6202a IZ |
44 | |
45 | # Enable code for printing memory statistics. | |
46 | DEBUGGING_MSTATS (!PLAIN_MALLOC && PERL_CORE) | |
47 | ||
48 | # Move allocation info for small buckets into separate areas. | |
49 | # Memory optimization (especially for small allocations, of the | |
50 | # less than 64 bytes). Since perl usually makes a large number | |
51 | # of small allocations, this is usually a win. | |
52 | PACK_MALLOC (!PLAIN_MALLOC && !RCHECK) | |
53 | ||
54 | # Add one page to big powers of two when calculating bucket size. | |
55 | # This is targeted at big allocations, as are common in image | |
56 | # processing. | |
57 | TWO_POT_OPTIMIZE !PLAIN_MALLOC | |
58 | ||
59 | # Use intermediate bucket sizes between powers-of-two. This is | |
60 | # generally a memory optimization, and a (small) speed pessimization. | |
61 | BUCKETS_ROOT2 !NO_FANCY_MALLOC | |
62 | ||
63 | # Do not check small deallocations for bad free(). Memory | |
64 | # and speed optimization, error reporting pessimization. | |
65 | IGNORE_SMALL_BAD_FREE (!NO_FANCY_MALLOC && !RCHECK) | |
66 | ||
67 | # Use table lookup to decide in which bucket a given allocation will go. | |
68 | SMALL_BUCKET_VIA_TABLE !NO_FANCY_MALLOC | |
69 | ||
38ac2dc8 DD |
70 | # Use a perl-defined sbrk() instead of the (presumably broken or |
71 | # missing) system-supplied sbrk(). | |
72 | USE_PERL_SBRK undef | |
73 | ||
74 | # Use system malloc() (or calloc() etc.) to emulate sbrk(). Normally | |
75 | # only used with broken sbrk()s. | |
87c6202a IZ |
76 | PERL_SBRK_VIA_MALLOC undef |
77 | ||
38ac2dc8 DD |
78 | # Which allocator to use if PERL_SBRK_VIA_MALLOC |
79 | SYSTEM_ALLOC(a) malloc(a) | |
80 | ||
9ee81ef6 | 81 | # Minimal alignment (in bytes, should be a power of 2) of SYSTEM_ALLOC |
5bbd1ef5 IZ |
82 | SYSTEM_ALLOC_ALIGNMENT MEM_ALIGNBYTES |
83 | ||
87c6202a IZ |
84 | # Disable memory overwrite checking with DEBUGGING. Memory and speed |
85 | # optimization, error reporting pessimization. | |
86 | NO_RCHECK undef | |
87 | ||
88 | # Enable memory overwrite checking with DEBUGGING. Memory and speed | |
89 | # pessimization, error reporting optimization | |
90 | RCHECK (DEBUGGING && !NO_RCHECK) | |
91 | ||
22f7c9c9 JH |
92 | # Do not overwrite uninit areas with DEBUGGING. Speed |
93 | # optimization, error reporting pessimization | |
94 | NO_MFILL undef | |
95 | ||
96 | # Overwrite uninit areas with DEBUGGING. Speed | |
97 | # pessimization, error reporting optimization | |
98 | MALLOC_FILL (DEBUGGING && !NO_RCHECK && !NO_MFILL) | |
99 | ||
100 | # Do not check overwritten uninit areas with DEBUGGING. Speed | |
101 | # optimization, error reporting pessimization | |
102 | NO_FILL_CHECK undef | |
103 | ||
104 | # Check overwritten uninit areas with DEBUGGING. Speed | |
105 | # pessimization, error reporting optimization | |
106 | MALLOC_FILL_CHECK (DEBUGGING && !NO_RCHECK && !NO_FILL_CHECK) | |
107 | ||
87c6202a IZ |
108 | # Failed allocations bigger than this size croak (if |
109 | # PERL_EMERGENCY_SBRK is enabled) without touching $^M. See | |
110 | # perlvar.pod for a description of $^M. | |
111 | BIG_SIZE (1<<16) # 64K | |
112 | ||
113 | # Starting from this power of two, add an extra page to the | |
114 | # size of the bucket. This enables optimized allocations of sizes | |
115 | # close to powers of 2. Note that the value is indexed at 0. | |
116 | FIRST_BIG_POW2 15 # 32K, 16K is used too often | |
117 | ||
118 | # Estimate of minimal memory footprint. malloc uses this value to | |
119 | # request the most reasonable largest blocks of memory from the system. | |
120 | FIRST_SBRK (48*1024) | |
121 | ||
122 | # Round up sbrk()s to multiples of this. | |
123 | MIN_SBRK 2048 | |
124 | ||
125 | # Round up sbrk()s to multiples of this percent of footprint. | |
126 | MIN_SBRK_FRAC 3 | |
127 | ||
22f7c9c9 JH |
128 | # Round up sbrk()s to multiples of this multiple of 1/1000 of footprint. |
129 | MIN_SBRK_FRAC1000 (10 * MIN_SBRK_FRAC) | |
130 | ||
87c6202a IZ |
131 | # Add this much memory to big powers of two to get the bucket size. |
132 | PERL_PAGESIZE 4096 | |
133 | ||
134 | # This many sbrk() discontinuities should be tolerated even | |
135 | # from the start without deciding that sbrk() is usually | |
136 | # discontinuous. | |
137 | SBRK_ALLOW_FAILURES 3 | |
138 | ||
139 | # This many continuous sbrk()s compensate for one discontinuous one. | |
140 | SBRK_FAILURE_PRICE 50 | |
141 | ||
28ac10b1 IZ |
142 | # Some configurations may ask for 12-byte-or-so allocations which |
143 | # require 8-byte alignment (?!). In such situation one needs to | |
144 | # define this to disable 12-byte bucket (will increase memory footprint) | |
145 | STRICT_ALIGNMENT undef | |
146 | ||
22f7c9c9 JH |
147 | # Do not allow configuration of runtime options at runtime |
148 | NO_MALLOC_DYNAMIC_CFG undef | |
149 | ||
150 | # Do not allow configuration of runtime options via $ENV{PERL_MALLOC_OPT} | |
151 | NO_PERL_MALLOC_ENV undef | |
152 | ||
153 | [The variable consists of ;-separated parts of the form CODE=VALUE | |
154 | with 1-character codes F, M, f, A, P, G, d, a, c for runtime | |
155 | configuration of FIRST_SBRK, MIN_SBRK, MIN_SBRK_FRAC1000, | |
156 | SBRK_ALLOW_FAILURES, SBRK_FAILURE_PRICE, sbrk_goodness, | |
157 | filldead, fillalive, fillcheck. The last 3 are for DEBUGGING | |
158 | build, and allow switching the tests for free()ed memory read, | |
159 | uninit memory reads, and free()ed memory write.] | |
160 | ||
87c6202a IZ |
161 | This implementation assumes that calling PerlIO_printf() does not |
162 | result in any memory allocation calls (used during a panic). | |
163 | ||
164 | */ | |
165 | ||
741df71a IZ |
166 | /* |
167 | If used outside of Perl environment, it may be useful to redefine | |
168 | the following macros (listed below with defaults): | |
169 | ||
170 | # Type of address returned by allocation functions | |
171 | Malloc_t void * | |
172 | ||
173 | # Type of size argument for allocation functions | |
174 | MEM_SIZE unsigned long | |
175 | ||
c7374474 GS |
176 | # size of void* |
177 | PTRSIZE 4 | |
178 | ||
741df71a IZ |
179 | # Maximal value in LONG |
180 | LONG_MAX 0x7FFFFFFF | |
181 | ||
182 | # Unsigned integer type big enough to keep a pointer | |
183 | UV unsigned long | |
184 | ||
22f7c9c9 JH |
185 | # Signed integer of the same sizeof() as UV |
186 | IV long | |
187 | ||
741df71a IZ |
188 | # Type of pointer with 1-byte granularity |
189 | caddr_t char * | |
190 | ||
191 | # Type returned by free() | |
192 | Free_t void | |
193 | ||
22f7c9c9 JH |
194 | # Conversion of pointer to integer |
195 | PTR2UV(ptr) ((UV)(ptr)) | |
196 | ||
197 | # Conversion of integer to pointer | |
198 | INT2PTR(type, i) ((type)(i)) | |
199 | ||
200 | # printf()-%-Conversion of UV to pointer | |
201 | UVuf "lu" | |
202 | ||
203 | # printf()-%-Conversion of UV to hex pointer | |
204 | UVxf "lx" | |
205 | ||
206 | # Alignment to use | |
207 | MEM_ALIGNBYTES 4 | |
208 | ||
5bbd1ef5 IZ |
209 | # Very fatal condition reporting function (cannot call any ) |
210 | fatalcroak(arg) write(2,arg,strlen(arg)) + exit(2) | |
211 | ||
741df71a IZ |
212 | # Fatal error reporting function |
213 | croak(format, arg) warn(idem) + exit(1) | |
214 | ||
b022d2d2 IZ |
215 | # Fatal error reporting function |
216 | croak2(format, arg1, arg2) warn2(idem) + exit(1) | |
217 | ||
741df71a IZ |
218 | # Error reporting function |
219 | warn(format, arg) fprintf(stderr, idem) | |
220 | ||
b022d2d2 IZ |
221 | # Error reporting function |
222 | warn2(format, arg1, arg2) fprintf(stderr, idem) | |
223 | ||
741df71a | 224 | # Locking/unlocking for MT operation |
efc57feb GS |
225 | MALLOC_LOCK MUTEX_LOCK(&PL_malloc_mutex) |
226 | MALLOC_UNLOCK MUTEX_UNLOCK(&PL_malloc_mutex) | |
741df71a IZ |
227 | |
228 | # Locking/unlocking mutex for MT operation | |
229 | MUTEX_LOCK(l) void | |
230 | MUTEX_UNLOCK(l) void | |
231 | */ | |
232 | ||
22f7c9c9 JH |
233 | #ifdef HAVE_MALLOC_CFG_H |
234 | # include "malloc_cfg.h" | |
235 | #endif | |
236 | ||
e8bc2b5c GS |
237 | #ifndef NO_FANCY_MALLOC |
238 | # ifndef SMALL_BUCKET_VIA_TABLE | |
239 | # define SMALL_BUCKET_VIA_TABLE | |
240 | # endif | |
241 | # ifndef BUCKETS_ROOT2 | |
242 | # define BUCKETS_ROOT2 | |
243 | # endif | |
244 | # ifndef IGNORE_SMALL_BAD_FREE | |
245 | # define IGNORE_SMALL_BAD_FREE | |
246 | # endif | |
3562ef9b IZ |
247 | #endif |
248 | ||
e8bc2b5c GS |
249 | #ifndef PLAIN_MALLOC /* Bulk enable features */ |
250 | # ifndef PACK_MALLOC | |
251 | # define PACK_MALLOC | |
252 | # endif | |
253 | # ifndef TWO_POT_OPTIMIZE | |
254 | # define TWO_POT_OPTIMIZE | |
255 | # endif | |
22f7c9c9 | 256 | # if (defined(PERL_CORE) || !defined(NO_MALLOC_DYNAMIC_CFG)) && !defined(PERL_EMERGENCY_SBRK) |
d720c441 | 257 | # define PERL_EMERGENCY_SBRK |
e8bc2b5c GS |
258 | # endif |
259 | # if defined(PERL_CORE) && !defined(DEBUGGING_MSTATS) | |
260 | # define DEBUGGING_MSTATS | |
261 | # endif | |
262 | #endif | |
263 | ||
264 | #define MIN_BUC_POW2 (sizeof(void*) > 4 ? 3 : 2) /* Allow for 4-byte arena. */ | |
265 | #define MIN_BUCKET (MIN_BUC_POW2 * BUCKETS_PER_POW2) | |
266 | ||
e94c1c05 | 267 | #if !(defined(I286) || defined(atarist)) |
e8bc2b5c GS |
268 | /* take 2k unless the block is bigger than that */ |
269 | # define LOG_OF_MIN_ARENA 11 | |
270 | #else | |
271 | /* take 16k unless the block is bigger than that | |
272 | (80286s like large segments!), probably good on the atari too */ | |
273 | # define LOG_OF_MIN_ARENA 14 | |
274 | #endif | |
275 | ||
075abff3 AL |
276 | #if defined(DEBUGGING) && !defined(NO_RCHECK) |
277 | # define RCHECK | |
278 | #endif | |
279 | #if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_MFILL) && !defined(MALLOC_FILL) | |
280 | # define MALLOC_FILL | |
281 | #endif | |
282 | #if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_FILL_CHECK) && !defined(MALLOC_FILL_CHECK) | |
283 | # define MALLOC_FILL_CHECK | |
284 | #endif | |
285 | #if defined(RCHECK) && defined(IGNORE_SMALL_BAD_FREE) | |
286 | # undef IGNORE_SMALL_BAD_FREE | |
287 | #endif | |
8d063cd8 LW |
288 | /* |
289 | * malloc.c (Caltech) 2/21/82 | |
290 | * Chris Kingsley, kingsley@cit-20. | |
291 | * | |
292 | * This is a very fast storage allocator. It allocates blocks of a small | |
293 | * number of different sizes, and keeps free lists of each size. Blocks that | |
294 | * don't exactly fit are passed up to the next larger size. In this | |
295 | * implementation, the available sizes are 2^n-4 (or 2^n-12) bytes long. | |
cf5c4ad8 | 296 | * If PACK_MALLOC is defined, small blocks are 2^n bytes long. |
8d063cd8 | 297 | * This is designed for use in a program that uses vast quantities of memory, |
741df71a IZ |
298 | * but bombs when it runs out. |
299 | * | |
4eb8286e | 300 | * Modifications Copyright Ilya Zakharevich 1996-99. |
741df71a IZ |
301 | * |
302 | * Still very quick, but much more thrifty. (Std config is 10% slower | |
303 | * than it was, and takes 67% of old heap size for typical usage.) | |
304 | * | |
305 | * Allocations of small blocks are now table-driven to many different | |
486ec47a | 306 | * buckets. Sizes of really big buckets are increased to accommodate |
741df71a IZ |
307 | * common size=power-of-2 blocks. Running-out-of-memory is made into |
308 | * an exception. Deeply configurable and thread-safe. | |
309 | * | |
8d063cd8 LW |
310 | */ |
311 | ||
d720c441 IZ |
312 | #ifdef PERL_CORE |
313 | # include "EXTERN.h" | |
4ad56ec9 | 314 | # define PERL_IN_MALLOC_C |
d720c441 | 315 | # include "perl.h" |
cea2e8a9 GS |
316 | # if defined(PERL_IMPLICIT_CONTEXT) |
317 | # define croak Perl_croak_nocontext | |
b022d2d2 | 318 | # define croak2 Perl_croak_nocontext |
cea2e8a9 | 319 | # define warn Perl_warn_nocontext |
b022d2d2 IZ |
320 | # define warn2 Perl_warn_nocontext |
321 | # else | |
322 | # define croak2 croak | |
323 | # define warn2 warn | |
cea2e8a9 | 324 | # endif |
22f7c9c9 JH |
325 | # if defined(USE_5005THREADS) || defined(USE_ITHREADS) |
326 | # define PERL_MAYBE_ALIVE PL_thr_key | |
327 | # else | |
328 | # define PERL_MAYBE_ALIVE 1 | |
329 | # endif | |
d720c441 IZ |
330 | #else |
331 | # ifdef PERL_FOR_X2P | |
332 | # include "../EXTERN.h" | |
333 | # include "../perl.h" | |
334 | # else | |
335 | # include <stdlib.h> | |
336 | # include <stdio.h> | |
337 | # include <memory.h> | |
22f7c9c9 JH |
338 | # ifdef OS2 |
339 | # include <io.h> | |
340 | # endif | |
341 | # include <string.h> | |
d720c441 IZ |
342 | # ifndef Malloc_t |
343 | # define Malloc_t void * | |
344 | # endif | |
c7374474 GS |
345 | # ifndef PTRSIZE |
346 | # define PTRSIZE 4 | |
347 | # endif | |
d720c441 IZ |
348 | # ifndef MEM_SIZE |
349 | # define MEM_SIZE unsigned long | |
350 | # endif | |
351 | # ifndef LONG_MAX | |
352 | # define LONG_MAX 0x7FFFFFFF | |
353 | # endif | |
354 | # ifndef UV | |
355 | # define UV unsigned long | |
356 | # endif | |
22f7c9c9 JH |
357 | # ifndef IV |
358 | # define IV long | |
359 | # endif | |
d720c441 IZ |
360 | # ifndef caddr_t |
361 | # define caddr_t char * | |
362 | # endif | |
363 | # ifndef Free_t | |
364 | # define Free_t void | |
365 | # endif | |
366 | # define Copy(s,d,n,t) (void)memcpy((char*)(d),(char*)(s), (n) * sizeof(t)) | |
e90e2364 | 367 | # define CopyD(s,d,n,t) memcpy((char*)(d),(char*)(s), (n) * sizeof(t)) |
d720c441 IZ |
368 | # define PerlEnv_getenv getenv |
369 | # define PerlIO_printf fprintf | |
370 | # define PerlIO_stderr() stderr | |
22f7c9c9 JH |
371 | # define PerlIO_puts(f,s) fputs(s,f) |
372 | # ifndef INT2PTR | |
373 | # define INT2PTR(t,i) ((t)(i)) | |
374 | # endif | |
375 | # ifndef PTR2UV | |
376 | # define PTR2UV(p) ((UV)(p)) | |
377 | # endif | |
378 | # ifndef UVuf | |
379 | # define UVuf "lu" | |
380 | # endif | |
381 | # ifndef UVxf | |
382 | # define UVxf "lx" | |
383 | # endif | |
22f7c9c9 JH |
384 | # ifndef MEM_ALIGNBYTES |
385 | # define MEM_ALIGNBYTES 4 | |
386 | # endif | |
d720c441 | 387 | # endif |
e8bc2b5c | 388 | # ifndef croak /* make depend */ |
741df71a | 389 | # define croak(mess, arg) (warn((mess), (arg)), exit(1)) |
d720c441 | 390 | # endif |
b022d2d2 IZ |
391 | # ifndef croak2 /* make depend */ |
392 | # define croak2(mess, arg1, arg2) (warn2((mess), (arg1), (arg2)), exit(1)) | |
393 | # endif | |
d720c441 | 394 | # ifndef warn |
741df71a | 395 | # define warn(mess, arg) fprintf(stderr, (mess), (arg)) |
e8bc2b5c | 396 | # endif |
0b415716 | 397 | # ifndef warn2 |
22f7c9c9 | 398 | # define warn2(mess, arg1, arg2) fprintf(stderr, (mess), (arg1), (arg2)) |
b022d2d2 | 399 | # endif |
e8bc2b5c GS |
400 | # ifdef DEBUG_m |
401 | # undef DEBUG_m | |
402 | # endif | |
403 | # define DEBUG_m(a) | |
404 | # ifdef DEBUGGING | |
405 | # undef DEBUGGING | |
406 | # endif | |
cea2e8a9 GS |
407 | # ifndef pTHX |
408 | # define pTHX void | |
409 | # define pTHX_ | |
0dbb1585 | 410 | # ifdef HASATTRIBUTE_UNUSED |
5ba4cab2 | 411 | # define dTHX extern int Perl___notused PERL_UNUSED_DECL |
afb90382 MS |
412 | # else |
413 | # define dTHX extern int Perl___notused | |
414 | # endif | |
cea2e8a9 | 415 | # endif |
c5be433b GS |
416 | # ifndef PERL_GET_INTERP |
417 | # define PERL_GET_INTERP PL_curinterp | |
418 | # endif | |
22f7c9c9 | 419 | # define PERL_MAYBE_ALIVE 1 |
4ad56ec9 IZ |
420 | # ifndef Perl_malloc |
421 | # define Perl_malloc malloc | |
422 | # endif | |
423 | # ifndef Perl_mfree | |
424 | # define Perl_mfree free | |
425 | # endif | |
426 | # ifndef Perl_realloc | |
427 | # define Perl_realloc realloc | |
428 | # endif | |
429 | # ifndef Perl_calloc | |
430 | # define Perl_calloc calloc | |
431 | # endif | |
432 | # ifndef Perl_strdup | |
433 | # define Perl_strdup strdup | |
434 | # endif | |
22f7c9c9 | 435 | #endif /* defined PERL_CORE */ |
e8bc2b5c GS |
436 | |
437 | #ifndef MUTEX_LOCK | |
438 | # define MUTEX_LOCK(l) | |
439 | #endif | |
440 | ||
441 | #ifndef MUTEX_UNLOCK | |
442 | # define MUTEX_UNLOCK(l) | |
443 | #endif | |
444 | ||
741df71a | 445 | #ifndef MALLOC_LOCK |
efc57feb | 446 | # define MALLOC_LOCK MUTEX_LOCK(&PL_malloc_mutex) |
741df71a IZ |
447 | #endif |
448 | ||
449 | #ifndef MALLOC_UNLOCK | |
efc57feb | 450 | # define MALLOC_UNLOCK MUTEX_UNLOCK(&PL_malloc_mutex) |
741df71a IZ |
451 | #endif |
452 | ||
5bbd1ef5 IZ |
453 | # ifndef fatalcroak /* make depend */ |
454 | # define fatalcroak(mess) (write(2, (mess), strlen(mess)), exit(2)) | |
455 | # endif | |
456 | ||
760ac839 | 457 | #ifdef DEBUGGING |
e8bc2b5c | 458 | # undef DEBUG_m |
51a5ed28 | 459 | # define DEBUG_m(a) \ |
0b250b9e | 460 | STMT_START { \ |
22f7c9c9 | 461 | if (PERL_MAYBE_ALIVE && PERL_GET_THX) { \ |
51a5ed28 HS |
462 | dTHX; \ |
463 | if (DEBUG_m_TEST) { \ | |
464 | PL_debug &= ~DEBUG_m_FLAG; \ | |
465 | a; \ | |
466 | PL_debug |= DEBUG_m_FLAG; \ | |
467 | } \ | |
468 | } \ | |
0b250b9e | 469 | } STMT_END |
760ac839 LW |
470 | #endif |
471 | ||
e476b1b5 GS |
472 | #ifdef PERL_IMPLICIT_CONTEXT |
473 | # define PERL_IS_ALIVE aTHX | |
474 | #else | |
475 | # define PERL_IS_ALIVE TRUE | |
476 | #endif | |
477 | ||
478 | ||
e9397286 GS |
479 | /* |
480 | * Layout of memory: | |
481 | * ~~~~~~~~~~~~~~~~ | |
482 | * The memory is broken into "blocks" which occupy multiples of 2K (and | |
483 | * generally speaking, have size "close" to a power of 2). The addresses | |
484 | * of such *unused* blocks are kept in nextf[i] with big enough i. (nextf | |
485 | * is an array of linked lists.) (Addresses of used blocks are not known.) | |
486 | * | |
4ad56ec9 | 487 | * Moreover, since the algorithm may try to "bite" smaller blocks out |
e9397286 GS |
488 | * of unused bigger ones, there are also regions of "irregular" size, |
489 | * managed separately, by a linked list chunk_chain. | |
490 | * | |
491 | * The third type of storage is the sbrk()ed-but-not-yet-used space, its | |
492 | * end and size are kept in last_sbrk_top and sbrked_remains. | |
493 | * | |
494 | * Growing blocks "in place": | |
495 | * ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
496 | * The address of the block with the greatest address is kept in last_op | |
497 | * (if not known, last_op is 0). If it is known that the memory above | |
498 | * last_op is not continuous, or contains a chunk from chunk_chain, | |
499 | * last_op is set to 0. | |
500 | * | |
501 | * The chunk with address last_op may be grown by expanding into | |
502 | * sbrk()ed-but-not-yet-used space, or trying to sbrk() more continuous | |
503 | * memory. | |
504 | * | |
505 | * Management of last_op: | |
506 | * ~~~~~~~~~~~~~~~~~~~~~ | |
507 | * | |
508 | * free() never changes the boundaries of blocks, so is not relevant. | |
509 | * | |
510 | * The only way realloc() may change the boundaries of blocks is if it | |
511 | * grows a block "in place". However, in the case of success such a | |
512 | * chunk is automatically last_op, and it remains last_op. In the case | |
513 | * of failure getpages_adjacent() clears last_op. | |
514 | * | |
515 | * malloc() may change blocks by calling morecore() only. | |
516 | * | |
517 | * morecore() may create new blocks by: | |
518 | * a) biting pieces from chunk_chain (cannot create one above last_op); | |
519 | * b) biting a piece from an unused block (if block was last_op, this | |
520 | * may create a chunk from chain above last_op, thus last_op is | |
521 | * invalidated in such a case). | |
522 | * c) biting of sbrk()ed-but-not-yet-used space. This creates | |
523 | * a block which is last_op. | |
524 | * d) Allocating new pages by calling getpages(); | |
525 | * | |
526 | * getpages() creates a new block. It marks last_op at the bottom of | |
527 | * the chunk of memory it returns. | |
528 | * | |
529 | * Active pages footprint: | |
530 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
531 | * Note that we do not need to traverse the lists in nextf[i], just take | |
532 | * the first element of this list. However, we *need* to traverse the | |
533 | * list in chunk_chain, but most the time it should be a very short one, | |
534 | * so we do not step on a lot of pages we are not going to use. | |
535 | * | |
536 | * Flaws: | |
537 | * ~~~~~ | |
538 | * get_from_bigger_buckets(): forget to increment price => Quite | |
539 | * aggressive. | |
540 | */ | |
541 | ||
135863df AB |
542 | /* I don't much care whether these are defined in sys/types.h--LAW */ |
543 | ||
544 | #define u_char unsigned char | |
545 | #define u_int unsigned int | |
56431972 RB |
546 | /* |
547 | * I removed the definition of u_bigint which appeared to be u_bigint = UV | |
548 | * u_bigint was only used in TWOK_MASKED and TWOK_SHIFT | |
549 | * where I have used PTR2UV. RMB | |
550 | */ | |
135863df | 551 | #define u_short unsigned short |
8d063cd8 | 552 | |
cf5c4ad8 | 553 | /* 286 and atarist like big chunks, which gives too much overhead. */ |
e94c1c05 | 554 | #if (defined(RCHECK) || defined(I286) || defined(atarist)) && defined(PACK_MALLOC) |
e8bc2b5c | 555 | # undef PACK_MALLOC |
cf5c4ad8 | 556 | #endif |
557 | ||
8d063cd8 | 558 | /* |
cf5c4ad8 | 559 | * The description below is applicable if PACK_MALLOC is not defined. |
560 | * | |
8d063cd8 LW |
561 | * The overhead on a block is at least 4 bytes. When free, this space |
562 | * contains a pointer to the next free block, and the bottom two bits must | |
563 | * be zero. When in use, the first byte is set to MAGIC, and the second | |
564 | * byte is the size index. The remaining bytes are for alignment. | |
565 | * If range checking is enabled and the size of the block fits | |
566 | * in two bytes, then the top two bytes hold the size of the requested block | |
567 | * plus the range checking words, and the header word MINUS ONE. | |
568 | */ | |
569 | union overhead { | |
570 | union overhead *ov_next; /* when free */ | |
85e6fe83 | 571 | #if MEM_ALIGNBYTES > 4 |
c623bd54 | 572 | double strut; /* alignment problems */ |
2b1d54e5 JH |
573 | # if MEM_ALIGNBYTES > 8 |
574 | char sstrut[MEM_ALIGNBYTES]; /* for the sizing */ | |
575 | # endif | |
a687059c | 576 | #endif |
8d063cd8 | 577 | struct { |
00ff3b56 JH |
578 | /* |
579 | * Keep the ovu_index and ovu_magic in this order, having a char | |
580 | * field first gives alignment indigestion in some systems, such as | |
581 | * MachTen. | |
582 | */ | |
8d063cd8 | 583 | u_char ovu_index; /* bucket # */ |
b72ff565 | 584 | u_char ovu_magic; /* magic number */ |
8d063cd8 | 585 | #ifdef RCHECK |
d0bbed78 | 586 | /* Subtract one to fit into u_short for an extra bucket */ |
22f7c9c9 | 587 | u_short ovu_size; /* block size (requested + overhead - 1) */ |
8d063cd8 LW |
588 | u_int ovu_rmagic; /* range magic number */ |
589 | #endif | |
590 | } ovu; | |
591 | #define ov_magic ovu.ovu_magic | |
592 | #define ov_index ovu.ovu_index | |
593 | #define ov_size ovu.ovu_size | |
594 | #define ov_rmagic ovu.ovu_rmagic | |
595 | }; | |
596 | ||
597 | #define MAGIC 0xff /* magic # on accounting info */ | |
598 | #define RMAGIC 0x55555555 /* magic # on range info */ | |
e8bc2b5c GS |
599 | #define RMAGIC_C 0x55 /* magic # on range info */ |
600 | ||
8d063cd8 | 601 | #ifdef RCHECK |
d0bbed78 | 602 | # define RMAGIC_SZ sizeof (u_int) /* Overhead at end of bucket */ |
c2a5c2d2 | 603 | # ifdef TWO_POT_OPTIMIZE |
22f7c9c9 | 604 | # define MAX_SHORT_BUCKET (12 * BUCKETS_PER_POW2) /* size-1 fits in short */ |
c2a5c2d2 | 605 | # else |
e8bc2b5c | 606 | # define MAX_SHORT_BUCKET (13 * BUCKETS_PER_POW2) |
c2a5c2d2 | 607 | # endif |
8d063cd8 | 608 | #else |
d0bbed78 | 609 | # define RMAGIC_SZ 0 |
8d063cd8 LW |
610 | #endif |
611 | ||
e8bc2b5c GS |
612 | #if !defined(PACK_MALLOC) && defined(BUCKETS_ROOT2) |
613 | # undef BUCKETS_ROOT2 | |
614 | #endif | |
615 | ||
616 | #ifdef BUCKETS_ROOT2 | |
617 | # define BUCKET_TABLE_SHIFT 2 | |
618 | # define BUCKET_POW2_SHIFT 1 | |
619 | # define BUCKETS_PER_POW2 2 | |
620 | #else | |
621 | # define BUCKET_TABLE_SHIFT MIN_BUC_POW2 | |
622 | # define BUCKET_POW2_SHIFT 0 | |
623 | # define BUCKETS_PER_POW2 1 | |
624 | #endif | |
625 | ||
274c7500 IZ |
626 | #if !defined(MEM_ALIGNBYTES) || ((MEM_ALIGNBYTES > 4) && !defined(STRICT_ALIGNMENT)) |
627 | /* Figure out the alignment of void*. */ | |
628 | struct aligner { | |
629 | char c; | |
630 | void *p; | |
631 | }; | |
632 | # define ALIGN_SMALL ((int)((caddr_t)&(((struct aligner*)0)->p))) | |
633 | #else | |
634 | # define ALIGN_SMALL MEM_ALIGNBYTES | |
635 | #endif | |
636 | ||
637 | #define IF_ALIGN_8(yes,no) ((ALIGN_SMALL>4) ? (yes) : (no)) | |
638 | ||
e8bc2b5c GS |
639 | #ifdef BUCKETS_ROOT2 |
640 | # define MAX_BUCKET_BY_TABLE 13 | |
a3b680e6 | 641 | static const u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = |
e8bc2b5c GS |
642 | { |
643 | 0, 0, 0, 0, 4, 4, 8, 12, 16, 24, 32, 48, 64, 80, | |
644 | }; | |
d0bbed78 | 645 | # define BUCKET_SIZE_NO_SURPLUS(i) ((i) % 2 ? buck_size[i] : (1 << ((i) >> BUCKET_POW2_SHIFT))) |
e8bc2b5c GS |
646 | # define BUCKET_SIZE_REAL(i) ((i) <= MAX_BUCKET_BY_TABLE \ |
647 | ? buck_size[i] \ | |
648 | : ((1 << ((i) >> BUCKET_POW2_SHIFT)) \ | |
649 | - MEM_OVERHEAD(i) \ | |
650 | + POW2_OPTIMIZE_SURPLUS(i))) | |
651 | #else | |
d0bbed78 IZ |
652 | # define BUCKET_SIZE_NO_SURPLUS(i) (1 << ((i) >> BUCKET_POW2_SHIFT)) |
653 | # define BUCKET_SIZE(i) (BUCKET_SIZE_NO_SURPLUS(i) + POW2_OPTIMIZE_SURPLUS(i)) | |
654 | # define BUCKET_SIZE_REAL(i) (BUCKET_SIZE(i) - MEM_OVERHEAD(i)) | |
e8bc2b5c GS |
655 | #endif |
656 | ||
657 | ||
cf5c4ad8 | 658 | #ifdef PACK_MALLOC |
4ad56ec9 IZ |
659 | /* In this case there are several possible layout of arenas depending |
660 | * on the size. Arenas are of sizes multiple to 2K, 2K-aligned, and | |
661 | * have a size close to a power of 2. | |
662 | * | |
663 | * Arenas of the size >= 4K keep one chunk only. Arenas of size 2K | |
664 | * may keep one chunk or multiple chunks. Here are the possible | |
665 | * layouts of arenas: | |
666 | * | |
667 | * # One chunk only, chunksize 2^k + SOMETHING - ALIGN, k >= 11 | |
668 | * | |
669 | * INDEX MAGIC1 UNUSED CHUNK1 | |
670 | * | |
671 | * # Multichunk with sanity checking and chunksize 2^k-ALIGN, k>7 | |
672 | * | |
673 | * INDEX MAGIC1 MAGIC2 MAGIC3 UNUSED CHUNK1 CHUNK2 CHUNK3 ... | |
674 | * | |
675 | * # Multichunk with sanity checking and size 2^k-ALIGN, k=7 | |
676 | * | |
677 | * INDEX MAGIC1 MAGIC2 MAGIC3 UNUSED CHUNK1 UNUSED CHUNK2 CHUNK3 ... | |
678 | * | |
679 | * # Multichunk with sanity checking and size up to 80 | |
680 | * | |
681 | * INDEX UNUSED MAGIC1 UNUSED MAGIC2 UNUSED ... CHUNK1 CHUNK2 CHUNK3 ... | |
682 | * | |
683 | * # No sanity check (usually up to 48=byte-long buckets) | |
684 | * INDEX UNUSED CHUNK1 CHUNK2 ... | |
685 | * | |
686 | * Above INDEX and MAGIC are one-byte-long. Sizes of UNUSED are | |
687 | * appropriate to keep algorithms simple and memory aligned. INDEX | |
688 | * encodes the size of the chunk, while MAGICn encodes state (used, | |
689 | * free or non-managed-by-us-so-it-indicates-a-bug) of CHUNKn. MAGIC | |
690 | * is used for sanity checking purposes only. SOMETHING is 0 or 4K | |
486ec47a | 691 | * (to make size of big CHUNK accommodate allocations for powers of two |
4ad56ec9 IZ |
692 | * better). |
693 | * | |
694 | * [There is no need to alignment between chunks, since C rules ensure | |
695 | * that structs which need 2^k alignment have sizeof which is | |
696 | * divisible by 2^k. Thus as far as the last chunk is aligned at the | |
697 | * end of the arena, and 2K-alignment does not contradict things, | |
698 | * everything is going to be OK for sizes of chunks 2^n and 2^n + | |
699 | * 2^k. Say, 80-bit buckets will be 16-bit aligned, and as far as we | |
700 | * put allocations for requests in 65..80 range, all is fine. | |
701 | * | |
702 | * Note, however, that standard malloc() puts more strict | |
703 | * requirements than the above C rules. Moreover, our algorithms of | |
704 | * realloc() may break this idyll, but we suppose that realloc() does | |
705 | * need not change alignment.] | |
706 | * | |
707 | * Is very important to make calculation of the offset of MAGICm as | |
708 | * quick as possible, since it is done on each malloc()/free(). In | |
709 | * fact it is so quick that it has quite little effect on the speed of | |
710 | * doing malloc()/free(). [By default] We forego such calculations | |
711 | * for small chunks, but only to save extra 3% of memory, not because | |
712 | * of speed considerations. | |
713 | * | |
714 | * Here is the algorithm [which is the same for all the allocations | |
715 | * schemes above], see OV_MAGIC(block,bucket). Let OFFSETm be the | |
716 | * offset of the CHUNKm from the start of ARENA. Then offset of | |
717 | * MAGICm is (OFFSET1 >> SHIFT) + ADDOFFSET. Here SHIFT and ADDOFFSET | |
718 | * are numbers which depend on the size of the chunks only. | |
719 | * | |
720 | * Let as check some sanity conditions. Numbers OFFSETm>>SHIFT are | |
721 | * different for all the chunks in the arena if 2^SHIFT is not greater | |
722 | * than size of the chunks in the arena. MAGIC1 will not overwrite | |
723 | * INDEX provided ADDOFFSET is >0 if OFFSET1 < 2^SHIFT. MAGIClast | |
724 | * will not overwrite CHUNK1 if OFFSET1 > (OFFSETlast >> SHIFT) + | |
725 | * ADDOFFSET. | |
726 | * | |
727 | * Make SHIFT the maximal possible (there is no point in making it | |
728 | * smaller). Since OFFSETlast is 2K - CHUNKSIZE, above restrictions | |
729 | * give restrictions on OFFSET1 and on ADDOFFSET. | |
730 | * | |
731 | * In particular, for chunks of size 2^k with k>=6 we can put | |
732 | * ADDOFFSET to be from 0 to 2^k - 2^(11-k), and have | |
733 | * OFFSET1==chunksize. For chunks of size 80 OFFSET1 of 2K%80=48 is | |
734 | * large enough to have ADDOFFSET between 1 and 16 (similarly for 96, | |
735 | * when ADDOFFSET should be 1). In particular, keeping MAGICs for | |
736 | * these sizes gives no additional size penalty. | |
737 | * | |
738 | * However, for chunks of size 2^k with k<=5 this gives OFFSET1 >= | |
739 | * ADDOFSET + 2^(11-k). Keeping ADDOFFSET 0 allows for 2^(11-k)-2^(11-2k) | |
740 | * chunks per arena. This is smaller than 2^(11-k) - 1 which are | |
741 | * needed if no MAGIC is kept. [In fact, having a negative ADDOFFSET | |
742 | * would allow for slightly more buckets per arena for k=2,3.] | |
743 | * | |
744 | * Similarly, for chunks of size 3/2*2^k with k<=5 MAGICs would span | |
745 | * the area up to 2^(11-k)+ADDOFFSET. For k=4 this give optimal | |
746 | * ADDOFFSET as -7..0. For k=3 ADDOFFSET can go up to 4 (with tiny | |
747 | * savings for negative ADDOFFSET). For k=5 ADDOFFSET can go -1..16 | |
748 | * (with no savings for negative values). | |
cf5c4ad8 | 749 | * |
4ad56ec9 IZ |
750 | * In particular, keeping ADDOFFSET 0 for sizes of chunks up to 2^6 |
751 | * leads to tiny pessimizations in case of sizes 4, 8, 12, 24, and | |
752 | * leads to no contradictions except for size=80 (or 96.) | |
cf5c4ad8 | 753 | * |
4ad56ec9 IZ |
754 | * However, it also makes sense to keep no magic for sizes 48 or less. |
755 | * This is what we do. In this case one needs ADDOFFSET>=1 also for | |
756 | * chunksizes 12, 24, and 48, unless one gets one less chunk per | |
757 | * arena. | |
758 | * | |
759 | * The algo of OV_MAGIC(block,bucket) keeps ADDOFFSET 0 until | |
760 | * chunksize of 64, then makes it 1. | |
cf5c4ad8 | 761 | * |
4ad56ec9 IZ |
762 | * This allows for an additional optimization: the above scheme leads |
763 | * to giant overheads for sizes 128 or more (one whole chunk needs to | |
764 | * be sacrifised to keep INDEX). Instead we use chunks not of size | |
765 | * 2^k, but of size 2^k-ALIGN. If we pack these chunks at the end of | |
766 | * the arena, then the beginnings are still in different 2^k-long | |
767 | * sections of the arena if k>=7 for ALIGN==4, and k>=8 if ALIGN=8. | |
768 | * Thus for k>7 the above algo of calculating the offset of the magic | |
769 | * will still give different answers for different chunks. And to | |
770 | * avoid the overrun of MAGIC1 into INDEX, one needs ADDOFFSET of >=1. | |
771 | * In the case k=7 we just move the first chunk an extra ALIGN | |
772 | * backward inside the ARENA (this is done once per arena lifetime, | |
773 | * thus is not a big overhead). */ | |
e8bc2b5c GS |
774 | # define MAX_PACKED_POW2 6 |
775 | # define MAX_PACKED (MAX_PACKED_POW2 * BUCKETS_PER_POW2 + BUCKET_POW2_SHIFT) | |
776 | # define MAX_POW2_ALGO ((1<<(MAX_PACKED_POW2 + 1)) - M_OVERHEAD) | |
777 | # define TWOK_MASK ((1<<LOG_OF_MIN_ARENA) - 1) | |
56431972 RB |
778 | # define TWOK_MASKED(x) (PTR2UV(x) & ~TWOK_MASK) |
779 | # define TWOK_SHIFT(x) (PTR2UV(x) & TWOK_MASK) | |
780 | # define OV_INDEXp(block) (INT2PTR(u_char*,TWOK_MASKED(block))) | |
cf5c4ad8 | 781 | # define OV_INDEX(block) (*OV_INDEXp(block)) |
782 | # define OV_MAGIC(block,bucket) (*(OV_INDEXp(block) + \ | |
e8bc2b5c GS |
783 | (TWOK_SHIFT(block)>> \ |
784 | (bucket>>BUCKET_POW2_SHIFT)) + \ | |
785 | (bucket >= MIN_NEEDS_SHIFT ? 1 : 0))) | |
786 | /* A bucket can have a shift smaller than it size, we need to | |
787 | shift its magic number so it will not overwrite index: */ | |
788 | # ifdef BUCKETS_ROOT2 | |
789 | # define MIN_NEEDS_SHIFT (7*BUCKETS_PER_POW2 - 1) /* Shift 80 greater than chunk 64. */ | |
790 | # else | |
791 | # define MIN_NEEDS_SHIFT (7*BUCKETS_PER_POW2) /* Shift 128 greater than chunk 32. */ | |
792 | # endif | |
cf5c4ad8 | 793 | # define CHUNK_SHIFT 0 |
794 | ||
e8bc2b5c GS |
795 | /* Number of active buckets of given ordinal. */ |
796 | #ifdef IGNORE_SMALL_BAD_FREE | |
797 | #define FIRST_BUCKET_WITH_CHECK (6 * BUCKETS_PER_POW2) /* 64 */ | |
798 | # define N_BLKS(bucket) ( (bucket) < FIRST_BUCKET_WITH_CHECK \ | |
d0bbed78 | 799 | ? ((1<<LOG_OF_MIN_ARENA) - 1)/BUCKET_SIZE_NO_SURPLUS(bucket) \ |
e8bc2b5c GS |
800 | : n_blks[bucket] ) |
801 | #else | |
802 | # define N_BLKS(bucket) n_blks[bucket] | |
803 | #endif | |
804 | ||
a3b680e6 | 805 | static const u_short n_blks[LOG_OF_MIN_ARENA * BUCKETS_PER_POW2] = |
e8bc2b5c GS |
806 | { |
807 | # if BUCKETS_PER_POW2==1 | |
808 | 0, 0, | |
809 | (MIN_BUC_POW2==2 ? 384 : 0), | |
810 | 224, 120, 62, 31, 16, 8, 4, 2 | |
811 | # else | |
812 | 0, 0, 0, 0, | |
813 | (MIN_BUC_POW2==2 ? 384 : 0), (MIN_BUC_POW2==2 ? 384 : 0), /* 4, 4 */ | |
814 | 224, 149, 120, 80, 62, 41, 31, 25, 16, 16, 8, 8, 4, 4, 2, 2 | |
815 | # endif | |
816 | }; | |
817 | ||
818 | /* Shift of the first bucket with the given ordinal inside 2K chunk. */ | |
819 | #ifdef IGNORE_SMALL_BAD_FREE | |
820 | # define BLK_SHIFT(bucket) ( (bucket) < FIRST_BUCKET_WITH_CHECK \ | |
821 | ? ((1<<LOG_OF_MIN_ARENA) \ | |
d0bbed78 | 822 | - BUCKET_SIZE_NO_SURPLUS(bucket) * N_BLKS(bucket)) \ |
e8bc2b5c GS |
823 | : blk_shift[bucket]) |
824 | #else | |
825 | # define BLK_SHIFT(bucket) blk_shift[bucket] | |
826 | #endif | |
827 | ||
a3b680e6 | 828 | static const u_short blk_shift[LOG_OF_MIN_ARENA * BUCKETS_PER_POW2] = |
e8bc2b5c GS |
829 | { |
830 | # if BUCKETS_PER_POW2==1 | |
831 | 0, 0, | |
832 | (MIN_BUC_POW2==2 ? 512 : 0), | |
833 | 256, 128, 64, 64, /* 8 to 64 */ | |
834 | 16*sizeof(union overhead), | |
835 | 8*sizeof(union overhead), | |
836 | 4*sizeof(union overhead), | |
837 | 2*sizeof(union overhead), | |
838 | # else | |
839 | 0, 0, 0, 0, | |
840 | (MIN_BUC_POW2==2 ? 512 : 0), (MIN_BUC_POW2==2 ? 512 : 0), | |
841 | 256, 260, 128, 128, 64, 80, 64, 48, /* 8 to 96 */ | |
842 | 16*sizeof(union overhead), 16*sizeof(union overhead), | |
843 | 8*sizeof(union overhead), 8*sizeof(union overhead), | |
844 | 4*sizeof(union overhead), 4*sizeof(union overhead), | |
845 | 2*sizeof(union overhead), 2*sizeof(union overhead), | |
846 | # endif | |
847 | }; | |
cf5c4ad8 | 848 | |
5bbd1ef5 IZ |
849 | # define NEEDED_ALIGNMENT 0x800 /* 2k boundaries */ |
850 | # define WANTED_ALIGNMENT 0x800 /* 2k boundaries */ | |
851 | ||
cf5c4ad8 | 852 | #else /* !PACK_MALLOC */ |
853 | ||
854 | # define OV_MAGIC(block,bucket) (block)->ov_magic | |
855 | # define OV_INDEX(block) (block)->ov_index | |
856 | # define CHUNK_SHIFT 1 | |
e8bc2b5c | 857 | # define MAX_PACKED -1 |
5bbd1ef5 IZ |
858 | # define NEEDED_ALIGNMENT MEM_ALIGNBYTES |
859 | # define WANTED_ALIGNMENT 0x400 /* 1k boundaries */ | |
860 | ||
cf5c4ad8 | 861 | #endif /* !PACK_MALLOC */ |
862 | ||
d0bbed78 | 863 | #define M_OVERHEAD (sizeof(union overhead) + RMAGIC_SZ) /* overhead at start+end */ |
e8bc2b5c GS |
864 | |
865 | #ifdef PACK_MALLOC | |
866 | # define MEM_OVERHEAD(bucket) \ | |
867 | (bucket <= MAX_PACKED ? 0 : M_OVERHEAD) | |
868 | # ifdef SMALL_BUCKET_VIA_TABLE | |
869 | # define START_SHIFTS_BUCKET ((MAX_PACKED_POW2 + 1) * BUCKETS_PER_POW2) | |
870 | # define START_SHIFT MAX_PACKED_POW2 | |
871 | # ifdef BUCKETS_ROOT2 /* Chunks of size 3*2^n. */ | |
872 | # define SIZE_TABLE_MAX 80 | |
873 | # else | |
874 | # define SIZE_TABLE_MAX 64 | |
875 | # endif | |
a3b680e6 | 876 | static const char bucket_of[] = |
e8bc2b5c GS |
877 | { |
878 | # ifdef BUCKETS_ROOT2 /* Chunks of size 3*2^n. */ | |
879 | /* 0 to 15 in 4-byte increments. */ | |
880 | (sizeof(void*) > 4 ? 6 : 5), /* 4/8, 5-th bucket for better reports */ | |
881 | 6, /* 8 */ | |
274c7500 | 882 | IF_ALIGN_8(8,7), 8, /* 16/12, 16 */ |
e8bc2b5c GS |
883 | 9, 9, 10, 10, /* 24, 32 */ |
884 | 11, 11, 11, 11, /* 48 */ | |
885 | 12, 12, 12, 12, /* 64 */ | |
886 | 13, 13, 13, 13, /* 80 */ | |
887 | 13, 13, 13, 13 /* 80 */ | |
888 | # else /* !BUCKETS_ROOT2 */ | |
889 | /* 0 to 15 in 4-byte increments. */ | |
890 | (sizeof(void*) > 4 ? 3 : 2), | |
891 | 3, | |
892 | 4, 4, | |
893 | 5, 5, 5, 5, | |
894 | 6, 6, 6, 6, | |
895 | 6, 6, 6, 6 | |
896 | # endif /* !BUCKETS_ROOT2 */ | |
897 | }; | |
898 | # else /* !SMALL_BUCKET_VIA_TABLE */ | |
899 | # define START_SHIFTS_BUCKET MIN_BUCKET | |
900 | # define START_SHIFT (MIN_BUC_POW2 - 1) | |
901 | # endif /* !SMALL_BUCKET_VIA_TABLE */ | |
902 | #else /* !PACK_MALLOC */ | |
903 | # define MEM_OVERHEAD(bucket) M_OVERHEAD | |
904 | # ifdef SMALL_BUCKET_VIA_TABLE | |
905 | # undef SMALL_BUCKET_VIA_TABLE | |
906 | # endif | |
907 | # define START_SHIFTS_BUCKET MIN_BUCKET | |
908 | # define START_SHIFT (MIN_BUC_POW2 - 1) | |
909 | #endif /* !PACK_MALLOC */ | |
cf5c4ad8 | 910 | |
8d063cd8 | 911 | /* |
55497cff | 912 | * Big allocations are often of the size 2^n bytes. To make them a |
913 | * little bit better, make blocks of size 2^n+pagesize for big n. | |
914 | */ | |
915 | ||
916 | #ifdef TWO_POT_OPTIMIZE | |
917 | ||
5f05dabc | 918 | # ifndef PERL_PAGESIZE |
919 | # define PERL_PAGESIZE 4096 | |
920 | # endif | |
e8bc2b5c GS |
921 | # ifndef FIRST_BIG_POW2 |
922 | # define FIRST_BIG_POW2 15 /* 32K, 16K is used too often. */ | |
5f05dabc | 923 | # endif |
e8bc2b5c | 924 | # define FIRST_BIG_BLOCK (1<<FIRST_BIG_POW2) |
55497cff | 925 | /* If this value or more, check against bigger blocks. */ |
926 | # define FIRST_BIG_BOUND (FIRST_BIG_BLOCK - M_OVERHEAD) | |
927 | /* If less than this value, goes into 2^n-overhead-block. */ | |
928 | # define LAST_SMALL_BOUND ((FIRST_BIG_BLOCK>>1) - M_OVERHEAD) | |
929 | ||
e8bc2b5c GS |
930 | # define POW2_OPTIMIZE_ADJUST(nbytes) \ |
931 | ((nbytes >= FIRST_BIG_BOUND) ? nbytes -= PERL_PAGESIZE : 0) | |
932 | # define POW2_OPTIMIZE_SURPLUS(bucket) \ | |
933 | ((bucket >= FIRST_BIG_POW2 * BUCKETS_PER_POW2) ? PERL_PAGESIZE : 0) | |
934 | ||
935 | #else /* !TWO_POT_OPTIMIZE */ | |
936 | # define POW2_OPTIMIZE_ADJUST(nbytes) | |
937 | # define POW2_OPTIMIZE_SURPLUS(bucket) 0 | |
938 | #endif /* !TWO_POT_OPTIMIZE */ | |
939 | ||
940 | #if defined(HAS_64K_LIMIT) && defined(PERL_CORE) | |
941 | # define BARK_64K_LIMIT(what,nbytes,size) \ | |
942 | if (nbytes > 0xffff) { \ | |
943 | PerlIO_printf(PerlIO_stderr(), \ | |
944 | "%s too large: %lx\n", what, size); \ | |
945 | my_exit(1); \ | |
946 | } | |
947 | #else /* !HAS_64K_LIMIT || !PERL_CORE */ | |
948 | # define BARK_64K_LIMIT(what,nbytes,size) | |
949 | #endif /* !HAS_64K_LIMIT || !PERL_CORE */ | |
55497cff | 950 | |
e8bc2b5c GS |
951 | #ifndef MIN_SBRK |
952 | # define MIN_SBRK 2048 | |
953 | #endif | |
954 | ||
955 | #ifndef FIRST_SBRK | |
d720c441 | 956 | # define FIRST_SBRK (48*1024) |
e8bc2b5c GS |
957 | #endif |
958 | ||
959 | /* Minimal sbrk in percents of what is already alloced. */ | |
960 | #ifndef MIN_SBRK_FRAC | |
961 | # define MIN_SBRK_FRAC 3 | |
962 | #endif | |
963 | ||
964 | #ifndef SBRK_ALLOW_FAILURES | |
965 | # define SBRK_ALLOW_FAILURES 3 | |
966 | #endif | |
55497cff | 967 | |
e8bc2b5c GS |
968 | #ifndef SBRK_FAILURE_PRICE |
969 | # define SBRK_FAILURE_PRICE 50 | |
55497cff | 970 | #endif |
971 | ||
24dd13bf JH |
972 | static void morecore (register int bucket); |
973 | # if defined(DEBUGGING) | |
9dbded1f | 974 | static void botch (const char *diag, const char *s, const char *file, int line); |
24dd13bf JH |
975 | # endif |
976 | static void add_to_chain (void *p, MEM_SIZE size, MEM_SIZE chip); | |
977 | static void* get_from_chain (MEM_SIZE size); | |
978 | static void* get_from_bigger_buckets(int bucket, MEM_SIZE size); | |
979 | static union overhead *getpages (MEM_SIZE needed, int *nblksp, int bucket); | |
980 | static int getpages_adjacent(MEM_SIZE require); | |
981 | ||
febabd2a | 982 | #ifdef PERL_CORE |
e8bc2b5c | 983 | |
3541dd58 | 984 | #ifdef I_MACH_CTHREADS |
772fe5b3 HM |
985 | # undef MUTEX_LOCK |
986 | # define MUTEX_LOCK(m) STMT_START { if (*m) mutex_lock(*m); } STMT_END | |
987 | # undef MUTEX_UNLOCK | |
988 | # define MUTEX_UNLOCK(m) STMT_START { if (*m) mutex_unlock(*m); } STMT_END | |
3541dd58 HM |
989 | #endif |
990 | ||
22f7c9c9 JH |
991 | #endif /* defined PERL_CORE */ |
992 | ||
993 | #ifndef PTRSIZE | |
994 | # define PTRSIZE sizeof(void*) | |
995 | #endif | |
996 | ||
b022d2d2 IZ |
997 | #ifndef BITS_IN_PTR |
998 | # define BITS_IN_PTR (8*PTRSIZE) | |
999 | #endif | |
1000 | ||
1001 | /* | |
1002 | * nextf[i] is the pointer to the next free block of size 2^i. The | |
1003 | * smallest allocatable block is 8 bytes. The overhead information | |
1004 | * precedes the data area returned to the user. | |
1005 | */ | |
1006 | #define NBUCKETS (BITS_IN_PTR*BUCKETS_PER_POW2 + 1) | |
1007 | static union overhead *nextf[NBUCKETS]; | |
1008 | ||
1009 | #if defined(PURIFY) && !defined(USE_PERL_SBRK) | |
1010 | # define USE_PERL_SBRK | |
1011 | #endif | |
1012 | ||
1013 | #ifdef USE_PERL_SBRK | |
3f270f98 | 1014 | # define sbrk(a) Perl_sbrk(a) |
b022d2d2 | 1015 | Malloc_t Perl_sbrk (int size); |
b022d2d2 | 1016 | #else |
3f270f98 | 1017 | # ifndef HAS_SBRK_PROTO /* <unistd.h> usually takes care of this */ |
b022d2d2 | 1018 | extern Malloc_t sbrk(int); |
3f270f98 | 1019 | # endif |
ef9f17be | 1020 | #endif |
b022d2d2 | 1021 | |
22f7c9c9 JH |
1022 | #ifndef MIN_SBRK_FRAC1000 /* Backward compatibility */ |
1023 | # define MIN_SBRK_FRAC1000 (MIN_SBRK_FRAC * 10) | |
1024 | #endif | |
1025 | ||
1026 | #ifndef START_EXTERN_C | |
1027 | # ifdef __cplusplus | |
1028 | # define START_EXTERN_C extern "C" { | |
1029 | # else | |
1030 | # define START_EXTERN_C | |
1031 | # endif | |
1032 | #endif | |
1033 | ||
1034 | #ifndef END_EXTERN_C | |
1035 | # ifdef __cplusplus | |
1036 | # define END_EXTERN_C }; | |
1037 | # else | |
1038 | # define END_EXTERN_C | |
1039 | # endif | |
1040 | #endif | |
1041 | ||
1042 | #include "malloc_ctl.h" | |
1043 | ||
1044 | #ifndef NO_MALLOC_DYNAMIC_CFG | |
1045 | # define PERL_MALLOC_OPT_CHARS "FMfAPGdac" | |
1046 | ||
41ad8e42 JH |
1047 | # ifndef FILL_DEAD_DEFAULT |
1048 | # define FILL_DEAD_DEFAULT 1 | |
1049 | # endif | |
1050 | # ifndef FILL_ALIVE_DEFAULT | |
1051 | # define FILL_ALIVE_DEFAULT 1 | |
1052 | # endif | |
1053 | # ifndef FILL_CHECK_DEFAULT | |
1054 | # define FILL_CHECK_DEFAULT 1 | |
1055 | # endif | |
1056 | ||
22f7c9c9 JH |
1057 | static IV MallocCfg[MallocCfg_last] = { |
1058 | FIRST_SBRK, | |
1059 | MIN_SBRK, | |
1060 | MIN_SBRK_FRAC, | |
1061 | SBRK_ALLOW_FAILURES, | |
1062 | SBRK_FAILURE_PRICE, | |
1063 | SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE, /* sbrk_goodness */ | |
41ad8e42 JH |
1064 | FILL_DEAD_DEFAULT, /* FILL_DEAD */ |
1065 | FILL_ALIVE_DEFAULT, /* FILL_ALIVE */ | |
1066 | FILL_CHECK_DEFAULT, /* FILL_CHECK */ | |
22f7c9c9 JH |
1067 | 0, /* MallocCfg_skip_cfg_env */ |
1068 | 0, /* MallocCfg_cfg_env_read */ | |
1069 | 0, /* MallocCfg_emergency_buffer_size */ | |
1070 | 0, /* MallocCfg_emergency_buffer_prepared_size */ | |
1071 | 0 /* MallocCfg_emergency_buffer_last_req */ | |
1072 | }; | |
1073 | IV *MallocCfg_ptr = MallocCfg; | |
1074 | ||
6af660ee IZ |
1075 | static char* MallocCfgP[MallocCfg_last] = { |
1076 | 0, /* MallocCfgP_emergency_buffer */ | |
1077 | 0, /* MallocCfgP_emergency_buffer_prepared */ | |
1078 | }; | |
1079 | char **MallocCfgP_ptr = MallocCfgP; | |
1080 | ||
22f7c9c9 JH |
1081 | # undef MIN_SBRK |
1082 | # undef FIRST_SBRK | |
1083 | # undef MIN_SBRK_FRAC1000 | |
1084 | # undef SBRK_ALLOW_FAILURES | |
1085 | # undef SBRK_FAILURE_PRICE | |
1086 | ||
1087 | # define MIN_SBRK MallocCfg[MallocCfg_MIN_SBRK] | |
1088 | # define FIRST_SBRK MallocCfg[MallocCfg_FIRST_SBRK] | |
1089 | # define MIN_SBRK_FRAC1000 MallocCfg[MallocCfg_MIN_SBRK_FRAC1000] | |
1090 | # define SBRK_ALLOW_FAILURES MallocCfg[MallocCfg_SBRK_ALLOW_FAILURES] | |
1091 | # define SBRK_FAILURE_PRICE MallocCfg[MallocCfg_SBRK_FAILURE_PRICE] | |
1092 | ||
1093 | # define sbrk_goodness MallocCfg[MallocCfg_sbrk_goodness] | |
1094 | ||
1095 | # define emergency_buffer_size MallocCfg[MallocCfg_emergency_buffer_size] | |
1096 | # define emergency_buffer_last_req MallocCfg[MallocCfg_emergency_buffer_last_req] | |
1097 | ||
1098 | # define FILL_DEAD MallocCfg[MallocCfg_filldead] | |
1099 | # define FILL_ALIVE MallocCfg[MallocCfg_fillalive] | |
1100 | # define FILL_CHECK_CFG MallocCfg[MallocCfg_fillcheck] | |
1101 | # define FILL_CHECK (FILL_DEAD && FILL_CHECK_CFG) | |
1102 | ||
6af660ee IZ |
1103 | # define emergency_buffer MallocCfgP[MallocCfgP_emergency_buffer] |
1104 | # define emergency_buffer_prepared MallocCfgP[MallocCfgP_emergency_buffer_prepared] | |
1105 | ||
22f7c9c9 JH |
1106 | #else /* defined(NO_MALLOC_DYNAMIC_CFG) */ |
1107 | ||
1108 | # define FILL_DEAD 1 | |
1109 | # define FILL_ALIVE 1 | |
1110 | # define FILL_CHECK 1 | |
1111 | static int sbrk_goodness = SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE; | |
1112 | ||
1113 | # define NO_PERL_MALLOC_ENV | |
1114 | ||
1115 | #endif | |
1116 | ||
b022d2d2 IZ |
1117 | #ifdef DEBUGGING_MSTATS |
1118 | /* | |
1119 | * nmalloc[i] is the difference between the number of mallocs and frees | |
1120 | * for a given block size. | |
1121 | */ | |
1122 | static u_int nmalloc[NBUCKETS]; | |
1123 | static u_int sbrk_slack; | |
1124 | static u_int start_slack; | |
1125 | #else /* !( defined DEBUGGING_MSTATS ) */ | |
1126 | # define sbrk_slack 0 | |
1127 | #endif | |
1128 | ||
1129 | static u_int goodsbrk; | |
1130 | ||
22f7c9c9 | 1131 | #ifdef PERL_EMERGENCY_SBRK |
febabd2a DD |
1132 | |
1133 | # ifndef BIG_SIZE | |
1134 | # define BIG_SIZE (1<<16) /* 64K */ | |
1135 | # endif | |
1136 | ||
22f7c9c9 | 1137 | # ifdef NO_MALLOC_DYNAMIC_CFG |
55497cff | 1138 | static MEM_SIZE emergency_buffer_size; |
22f7c9c9 JH |
1139 | /* 0 if the last request for more memory succeeded. |
1140 | Otherwise the size of the failing request. */ | |
1141 | static MEM_SIZE emergency_buffer_last_req; | |
6af660ee IZ |
1142 | static char *emergency_buffer; |
1143 | static char *emergency_buffer_prepared; | |
22f7c9c9 JH |
1144 | # endif |
1145 | ||
1146 | # ifndef emergency_sbrk_croak | |
1147 | # define emergency_sbrk_croak croak2 | |
1148 | # endif | |
1149 | ||
1150 | # ifdef PERL_CORE | |
1151 | static char * | |
1152 | perl_get_emergency_buffer(IV *size) | |
1153 | { | |
1154 | dTHX; | |
1155 | /* First offense, give a possibility to recover by dieing. */ | |
1156 | /* No malloc involved here: */ | |
22f7c9c9 JH |
1157 | SV *sv; |
1158 | char *pv; | |
a4fc7abc | 1159 | GV **gvp = (GV**)hv_fetchs(PL_defstash, "^M", FALSE); |
22f7c9c9 | 1160 | |
a4fc7abc | 1161 | if (!gvp) gvp = (GV**)hv_fetchs(PL_defstash, "\015", FALSE); |
22f7c9c9 JH |
1162 | if (!gvp || !(sv = GvSV(*gvp)) || !SvPOK(sv) |
1163 | || (SvLEN(sv) < (1<<LOG_OF_MIN_ARENA) - M_OVERHEAD)) | |
1164 | return NULL; /* Now die die die... */ | |
1165 | /* Got it, now detach SvPV: */ | |
4b1c440c | 1166 | pv = SvPV_nolen(sv); |
22f7c9c9 JH |
1167 | /* Check alignment: */ |
1168 | if ((PTR2UV(pv) - sizeof(union overhead)) & (NEEDED_ALIGNMENT - 1)) { | |
1169 | PerlIO_puts(PerlIO_stderr(),"Bad alignment of $^M!\n"); | |
1170 | return NULL; /* die die die */ | |
1171 | } | |
1172 | ||
1173 | SvPOK_off(sv); | |
bd61b366 | 1174 | SvPV_set(sv, NULL); |
87a1ef3d SP |
1175 | SvCUR_set(sv, 0); |
1176 | SvLEN_set(sv, 0); | |
22f7c9c9 JH |
1177 | *size = malloced_size(pv) + M_OVERHEAD; |
1178 | return pv - sizeof(union overhead); | |
1179 | } | |
1180 | # define PERL_GET_EMERGENCY_BUFFER(p) perl_get_emergency_buffer(p) | |
1181 | # else | |
1182 | # define PERL_GET_EMERGENCY_BUFFER(p) NULL | |
1183 | # endif /* defined PERL_CORE */ | |
1184 | ||
1185 | # ifndef NO_MALLOC_DYNAMIC_CFG | |
1186 | static char * | |
1187 | get_emergency_buffer(IV *size) | |
1188 | { | |
1189 | char *pv = emergency_buffer_prepared; | |
1190 | ||
1191 | *size = MallocCfg[MallocCfg_emergency_buffer_prepared_size]; | |
1192 | emergency_buffer_prepared = 0; | |
1193 | MallocCfg[MallocCfg_emergency_buffer_prepared_size] = 0; | |
1194 | return pv; | |
1195 | } | |
1196 | ||
1197 | /* Returns 0 on success, -1 on bad alignment, -2 if not implemented */ | |
1198 | int | |
1199 | set_emergency_buffer(char *b, IV size) | |
1200 | { | |
1201 | if (PTR2UV(b) & (NEEDED_ALIGNMENT - 1)) | |
1202 | return -1; | |
1203 | if (MallocCfg[MallocCfg_emergency_buffer_prepared_size]) | |
1204 | add_to_chain((void*)emergency_buffer_prepared, | |
1205 | MallocCfg[MallocCfg_emergency_buffer_prepared_size], 0); | |
1206 | emergency_buffer_prepared = b; | |
1207 | MallocCfg[MallocCfg_emergency_buffer_prepared_size] = size; | |
1208 | return 0; | |
1209 | } | |
1210 | # define GET_EMERGENCY_BUFFER(p) get_emergency_buffer(p) | |
1211 | # else /* NO_MALLOC_DYNAMIC_CFG */ | |
1212 | # define GET_EMERGENCY_BUFFER(p) NULL | |
1213 | int | |
1214 | set_emergency_buffer(char *b, IV size) | |
1215 | { | |
1216 | return -1; | |
1217 | } | |
1218 | # endif | |
55497cff | 1219 | |
cea2e8a9 GS |
1220 | static Malloc_t |
1221 | emergency_sbrk(MEM_SIZE size) | |
55497cff | 1222 | { |
28ac10b1 IZ |
1223 | MEM_SIZE rsize = (((size - 1)>>LOG_OF_MIN_ARENA) + 1)<<LOG_OF_MIN_ARENA; |
1224 | ||
22f7c9c9 | 1225 | if (size >= BIG_SIZE |
575fbe19 SH |
1226 | && (!emergency_buffer_last_req || |
1227 | (size < (MEM_SIZE)emergency_buffer_last_req))) { | |
b022d2d2 | 1228 | /* Give the possibility to recover, but avoid an infinite cycle. */ |
741df71a | 1229 | MALLOC_UNLOCK; |
22f7c9c9 JH |
1230 | emergency_buffer_last_req = size; |
1231 | emergency_sbrk_croak("Out of memory during \"large\" request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack)); | |
55497cff | 1232 | } |
1233 | ||
575fbe19 | 1234 | if ((MEM_SIZE)emergency_buffer_size >= rsize) { |
28ac10b1 IZ |
1235 | char *old = emergency_buffer; |
1236 | ||
1237 | emergency_buffer_size -= rsize; | |
1238 | emergency_buffer += rsize; | |
1239 | return old; | |
1240 | } else { | |
55497cff | 1241 | /* First offense, give a possibility to recover by dieing. */ |
1242 | /* No malloc involved here: */ | |
22f7c9c9 JH |
1243 | IV Size; |
1244 | char *pv = GET_EMERGENCY_BUFFER(&Size); | |
28ac10b1 | 1245 | int have = 0; |
55497cff | 1246 | |
28ac10b1 IZ |
1247 | if (emergency_buffer_size) { |
1248 | add_to_chain(emergency_buffer, emergency_buffer_size, 0); | |
1249 | emergency_buffer_size = 0; | |
bd61b366 | 1250 | emergency_buffer = NULL; |
28ac10b1 IZ |
1251 | have = 1; |
1252 | } | |
22f7c9c9 JH |
1253 | |
1254 | if (!pv) | |
1255 | pv = PERL_GET_EMERGENCY_BUFFER(&Size); | |
1256 | if (!pv) { | |
28ac10b1 IZ |
1257 | if (have) |
1258 | goto do_croak; | |
55497cff | 1259 | return (char *)-1; /* Now die die die... */ |
28ac10b1 | 1260 | } |
22f7c9c9 | 1261 | |
55497cff | 1262 | /* Check alignment: */ |
22f7c9c9 JH |
1263 | if (PTR2UV(pv) & (NEEDED_ALIGNMENT - 1)) { |
1264 | dTHX; | |
1265 | ||
55497cff | 1266 | PerlIO_puts(PerlIO_stderr(),"Bad alignment of $^M!\n"); |
bbce6d69 | 1267 | return (char *)-1; /* die die die */ |
55497cff | 1268 | } |
1269 | ||
22f7c9c9 JH |
1270 | emergency_buffer = pv; |
1271 | emergency_buffer_size = Size; | |
55497cff | 1272 | } |
28ac10b1 | 1273 | do_croak: |
741df71a | 1274 | MALLOC_UNLOCK; |
22f7c9c9 | 1275 | emergency_sbrk_croak("Out of memory during request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack)); |
ce70748c | 1276 | /* NOTREACHED */ |
bd61b366 | 1277 | return NULL; |
55497cff | 1278 | } |
1279 | ||
22f7c9c9 | 1280 | #else /* !defined(PERL_EMERGENCY_SBRK) */ |
55497cff | 1281 | # define emergency_sbrk(size) -1 |
22f7c9c9 JH |
1282 | #endif /* defined PERL_EMERGENCY_SBRK */ |
1283 | ||
1284 | static void | |
9dbded1f | 1285 | write2(const char *mess) |
22f7c9c9 JH |
1286 | { |
1287 | write(2, mess, strlen(mess)); | |
1288 | } | |
55497cff | 1289 | |
760ac839 | 1290 | #ifdef DEBUGGING |
3541dd58 | 1291 | #undef ASSERT |
e7e7e0a5 DM |
1292 | #define ASSERT(p,diag) if (!(p)) botch(diag,STRINGIFY(p),__FILE__,__LINE__); |
1293 | ||
cea2e8a9 | 1294 | static void |
9dbded1f | 1295 | botch(const char *diag, const char *s, const char *file, int line) |
8d063cd8 | 1296 | { |
899be101 | 1297 | dVAR; |
9dbded1f | 1298 | dTHX; |
22f7c9c9 JH |
1299 | if (!(PERL_MAYBE_ALIVE && PERL_GET_THX)) |
1300 | goto do_write; | |
1301 | else { | |
22f7c9c9 | 1302 | if (PerlIO_printf(PerlIO_stderr(), |
67920cb2 | 1303 | "assertion botched (%s?): %s %s:%d\n", |
066d1a89 | 1304 | diag, s, file, line) != 0) { |
22f7c9c9 JH |
1305 | do_write: /* Can be initializing interpreter */ |
1306 | write2("assertion botched ("); | |
1307 | write2(diag); | |
1308 | write2("?): "); | |
1309 | write2(s); | |
066d1a89 JH |
1310 | write2(" ("); |
1311 | write2(file); | |
1312 | write2(":"); | |
6bf964e1 JH |
1313 | { |
1314 | char linebuf[10]; | |
1315 | char *s = linebuf + sizeof(linebuf) - 1; | |
1316 | int n = line; | |
1317 | *s = 0; | |
1318 | do { | |
1319 | *--s = '0' + (n % 10); | |
1320 | } while (n /= 10); | |
1321 | write2(s); | |
1322 | } | |
066d1a89 | 1323 | write2(")\n"); |
22f7c9c9 | 1324 | } |
3028581b | 1325 | PerlProc_abort(); |
22f7c9c9 | 1326 | } |
8d063cd8 LW |
1327 | } |
1328 | #else | |
3541dd58 | 1329 | #define ASSERT(p, diag) |
8d063cd8 LW |
1330 | #endif |
1331 | ||
22f7c9c9 JH |
1332 | #ifdef MALLOC_FILL |
1333 | /* Fill should be long enough to cover long */ | |
1334 | static void | |
1335 | fill_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) | |
1336 | { | |
1337 | unsigned char *e = s + nbytes; | |
1338 | long *lp; | |
b464bac0 | 1339 | const long lfill = *(long*)fill; |
22f7c9c9 JH |
1340 | |
1341 | if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ | |
1342 | int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); | |
1343 | unsigned const char *f = fill + sizeof(long) - shift; | |
1344 | unsigned char *e1 = s + shift; | |
1345 | ||
1346 | while (s < e1) | |
1347 | *s++ = *f++; | |
1348 | } | |
1349 | lp = (long*)s; | |
1350 | while ((unsigned char*)(lp + 1) <= e) | |
1351 | *lp++ = lfill; | |
1352 | s = (unsigned char*)lp; | |
1353 | while (s < e) | |
1354 | *s++ = *fill++; | |
1355 | } | |
1356 | /* Just malloc()ed */ | |
1357 | static const unsigned char fill_feedadad[] = | |
1358 | {0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD, | |
1359 | 0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD}; | |
1360 | /* Just free()ed */ | |
1361 | static const unsigned char fill_deadbeef[] = | |
1362 | {0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF, | |
1363 | 0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF}; | |
1364 | # define FILL_DEADBEEF(s, n) \ | |
1365 | (void)(FILL_DEAD? (fill_pat_4bytes((s), (n), fill_deadbeef), 0) : 0) | |
1366 | # define FILL_FEEDADAD(s, n) \ | |
1367 | (void)(FILL_ALIVE? (fill_pat_4bytes((s), (n), fill_feedadad), 0) : 0) | |
1368 | #else | |
1369 | # define FILL_DEADBEEF(s, n) ((void)0) | |
1370 | # define FILL_FEEDADAD(s, n) ((void)0) | |
1371 | # undef MALLOC_FILL_CHECK | |
1372 | #endif | |
1373 | ||
1374 | #ifdef MALLOC_FILL_CHECK | |
1375 | static int | |
1376 | cmp_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) | |
1377 | { | |
1378 | unsigned char *e = s + nbytes; | |
1379 | long *lp; | |
b464bac0 | 1380 | const long lfill = *(long*)fill; |
22f7c9c9 JH |
1381 | |
1382 | if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ | |
1383 | int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); | |
1384 | unsigned const char *f = fill + sizeof(long) - shift; | |
1385 | unsigned char *e1 = s + shift; | |
1386 | ||
1387 | while (s < e1) | |
1388 | if (*s++ != *f++) | |
1389 | return 1; | |
1390 | } | |
1391 | lp = (long*)s; | |
1392 | while ((unsigned char*)(lp + 1) <= e) | |
1393 | if (*lp++ != lfill) | |
1394 | return 1; | |
1395 | s = (unsigned char*)lp; | |
1396 | while (s < e) | |
1397 | if (*s++ != *fill++) | |
1398 | return 1; | |
1399 | return 0; | |
1400 | } | |
1401 | # define FILLCHECK_DEADBEEF(s, n) \ | |
1402 | ASSERT(!FILL_CHECK || !cmp_pat_4bytes(s, n, fill_deadbeef), \ | |
1403 | "free()ed/realloc()ed-away memory was overwritten") | |
1404 | #else | |
1405 | # define FILLCHECK_DEADBEEF(s, n) ((void)0) | |
1406 | #endif | |
1407 | ||
64107180 NC |
1408 | int |
1409 | S_ajust_size_and_find_bucket(size_t *nbytes_p) | |
8d063cd8 | 1410 | { |
64107180 NC |
1411 | MEM_SIZE shiftr; |
1412 | int bucket; | |
1413 | size_t nbytes = *nbytes_p; | |
45d8adaa | 1414 | |
8d063cd8 LW |
1415 | /* |
1416 | * Convert amount of memory requested into | |
1417 | * closest block size stored in hash buckets | |
1418 | * which satisfies request. Account for | |
1419 | * space used per block for accounting. | |
1420 | */ | |
cf5c4ad8 | 1421 | #ifdef PACK_MALLOC |
e8bc2b5c GS |
1422 | # ifdef SMALL_BUCKET_VIA_TABLE |
1423 | if (nbytes == 0) | |
1424 | bucket = MIN_BUCKET; | |
1425 | else if (nbytes <= SIZE_TABLE_MAX) { | |
1426 | bucket = bucket_of[(nbytes - 1) >> BUCKET_TABLE_SHIFT]; | |
1427 | } else | |
1428 | # else | |
043bf814 RB |
1429 | if (nbytes == 0) |
1430 | nbytes = 1; | |
e8bc2b5c GS |
1431 | if (nbytes <= MAX_POW2_ALGO) goto do_shifts; |
1432 | else | |
1433 | # endif | |
55497cff | 1434 | #endif |
e8bc2b5c GS |
1435 | { |
1436 | POW2_OPTIMIZE_ADJUST(nbytes); | |
1437 | nbytes += M_OVERHEAD; | |
1438 | nbytes = (nbytes + 3) &~ 3; | |
516a5887 | 1439 | #if defined(PACK_MALLOC) && !defined(SMALL_BUCKET_VIA_TABLE) |
e8bc2b5c | 1440 | do_shifts: |
516a5887 | 1441 | #endif |
e8bc2b5c GS |
1442 | shiftr = (nbytes - 1) >> START_SHIFT; |
1443 | bucket = START_SHIFTS_BUCKET; | |
1444 | /* apart from this loop, this is O(1) */ | |
1445 | while (shiftr >>= 1) | |
1446 | bucket += BUCKETS_PER_POW2; | |
cf5c4ad8 | 1447 | } |
64107180 NC |
1448 | *nbytes_p = nbytes; |
1449 | return bucket; | |
1450 | } | |
1451 | ||
1452 | Malloc_t | |
1453 | Perl_malloc(size_t nbytes) | |
1454 | { | |
1455 | dVAR; | |
1456 | register union overhead *p; | |
1457 | register int bucket; | |
1458 | ||
1459 | #if defined(DEBUGGING) || defined(RCHECK) | |
1460 | MEM_SIZE size = nbytes; | |
1461 | #endif | |
1462 | ||
1463 | BARK_64K_LIMIT("Allocation",nbytes,nbytes); | |
1464 | #ifdef DEBUGGING | |
1465 | if ((long)nbytes < 0) | |
1466 | croak("%s", "panic: malloc"); | |
1467 | #endif | |
1468 | ||
1469 | bucket = S_ajust_size_and_find_bucket(&nbytes); | |
4ad56ec9 | 1470 | MALLOC_LOCK; |
8d063cd8 LW |
1471 | /* |
1472 | * If nothing in hash bucket right now, | |
1473 | * request more memory from the system. | |
1474 | */ | |
1475 | if (nextf[bucket] == NULL) | |
1476 | morecore(bucket); | |
e8bc2b5c | 1477 | if ((p = nextf[bucket]) == NULL) { |
741df71a | 1478 | MALLOC_UNLOCK; |
55497cff | 1479 | #ifdef PERL_CORE |
0b250b9e GS |
1480 | { |
1481 | dTHX; | |
1482 | if (!PL_nomemok) { | |
febabd2a DD |
1483 | #if defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) |
1484 | PerlIO_puts(PerlIO_stderr(),"Out of memory!\n"); | |
1485 | #else | |
b022d2d2 IZ |
1486 | char buff[80]; |
1487 | char *eb = buff + sizeof(buff) - 1; | |
1488 | char *s = eb; | |
1489 | size_t n = nbytes; | |
1490 | ||
1491 | PerlIO_puts(PerlIO_stderr(),"Out of memory during request for "); | |
1492 | #if defined(DEBUGGING) || defined(RCHECK) | |
1493 | n = size; | |
1494 | #endif | |
1495 | *s = 0; | |
1496 | do { | |
1497 | *--s = '0' + (n % 10); | |
1498 | } while (n /= 10); | |
1499 | PerlIO_puts(PerlIO_stderr(),s); | |
1500 | PerlIO_puts(PerlIO_stderr()," bytes, total sbrk() is "); | |
1501 | s = eb; | |
1502 | n = goodsbrk + sbrk_slack; | |
1503 | do { | |
1504 | *--s = '0' + (n % 10); | |
1505 | } while (n /= 10); | |
1506 | PerlIO_puts(PerlIO_stderr(),s); | |
1507 | PerlIO_puts(PerlIO_stderr()," bytes!\n"); | |
febabd2a | 1508 | #endif /* defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) */ |
0b250b9e GS |
1509 | my_exit(1); |
1510 | } | |
ee0007ab | 1511 | } |
45d8adaa | 1512 | #endif |
4ad56ec9 | 1513 | return (NULL); |
45d8adaa LW |
1514 | } |
1515 | ||
8d063cd8 | 1516 | /* remove from linked list */ |
22f7c9c9 JH |
1517 | #ifdef DEBUGGING |
1518 | if ( (PTR2UV(p) & (MEM_ALIGNBYTES - 1)) | |
1519 | /* Can't get this low */ | |
1520 | || (p && PTR2UV(p) < (1<<LOG_OF_MIN_ARENA)) ) { | |
e8cd8248 | 1521 | dTHX; |
b900a521 | 1522 | PerlIO_printf(PerlIO_stderr(), |
7fa2f4f1 GS |
1523 | "Unaligned pointer in the free chain 0x%"UVxf"\n", |
1524 | PTR2UV(p)); | |
1525 | } | |
22f7c9c9 JH |
1526 | if ( (PTR2UV(p->ov_next) & (MEM_ALIGNBYTES - 1)) |
1527 | || (p->ov_next && PTR2UV(p->ov_next) < (1<<LOG_OF_MIN_ARENA)) ) { | |
e8cd8248 | 1528 | dTHX; |
7fa2f4f1 | 1529 | PerlIO_printf(PerlIO_stderr(), |
a0288114 | 1530 | "Unaligned \"next\" pointer in the free " |
d2560b70 | 1531 | "chain 0x%"UVxf" at 0x%"UVxf"\n", |
7fa2f4f1 | 1532 | PTR2UV(p->ov_next), PTR2UV(p)); |
32e30700 | 1533 | } |
bf38876a LW |
1534 | #endif |
1535 | nextf[bucket] = p->ov_next; | |
4ad56ec9 IZ |
1536 | |
1537 | MALLOC_UNLOCK; | |
1538 | ||
51a5ed28 HS |
1539 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
1540 | "0x%"UVxf": (%05lu) malloc %ld bytes\n", | |
253fdc3f | 1541 | PTR2UV((Malloc_t)(p + CHUNK_SHIFT)), (unsigned long)(PL_an++), |
51a5ed28 HS |
1542 | (long)size)); |
1543 | ||
22f7c9c9 | 1544 | FILLCHECK_DEADBEEF((unsigned char*)(p + CHUNK_SHIFT), |
d0bbed78 | 1545 | BUCKET_SIZE_REAL(bucket) + RMAGIC_SZ); |
22f7c9c9 | 1546 | |
e8bc2b5c GS |
1547 | #ifdef IGNORE_SMALL_BAD_FREE |
1548 | if (bucket >= FIRST_BUCKET_WITH_CHECK) | |
1549 | #endif | |
1550 | OV_MAGIC(p, bucket) = MAGIC; | |
cf5c4ad8 | 1551 | #ifndef PACK_MALLOC |
1552 | OV_INDEX(p) = bucket; | |
1553 | #endif | |
8d063cd8 LW |
1554 | #ifdef RCHECK |
1555 | /* | |
1556 | * Record allocated size of block and | |
1557 | * bound space with magic numbers. | |
1558 | */ | |
8d063cd8 | 1559 | p->ov_rmagic = RMAGIC; |
e8bc2b5c GS |
1560 | if (bucket <= MAX_SHORT_BUCKET) { |
1561 | int i; | |
1562 | ||
1563 | nbytes = size + M_OVERHEAD; | |
1564 | p->ov_size = nbytes - 1; | |
d0bbed78 IZ |
1565 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
1566 | i = RMAGIC_SZ - i; | |
1567 | while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ | |
1568 | ((caddr_t)p + nbytes - RMAGIC_SZ)[i] = RMAGIC_C; | |
e8bc2b5c | 1569 | } |
d0bbed78 IZ |
1570 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
1571 | nbytes = (nbytes + RMAGIC_SZ - 1) & ~(RMAGIC_SZ - 1); | |
1572 | ((u_int *)((caddr_t)p + nbytes))[-1] = RMAGIC; | |
e8bc2b5c | 1573 | } |
22f7c9c9 | 1574 | FILL_FEEDADAD((unsigned char *)(p + CHUNK_SHIFT), size); |
8d063cd8 | 1575 | #endif |
cf5c4ad8 | 1576 | return ((Malloc_t)(p + CHUNK_SHIFT)); |
8d063cd8 LW |
1577 | } |
1578 | ||
e8bc2b5c GS |
1579 | static char *last_sbrk_top; |
1580 | static char *last_op; /* This arena can be easily extended. */ | |
6e21dc91 | 1581 | static MEM_SIZE sbrked_remains; |
e8bc2b5c GS |
1582 | |
1583 | #ifdef DEBUGGING_MSTATS | |
1584 | static int sbrks; | |
1585 | #endif | |
1586 | ||
1587 | struct chunk_chain_s { | |
1588 | struct chunk_chain_s *next; | |
1589 | MEM_SIZE size; | |
1590 | }; | |
1591 | static struct chunk_chain_s *chunk_chain; | |
1592 | static int n_chunks; | |
1593 | static char max_bucket; | |
1594 | ||
1595 | /* Cutoff a piece of one of the chunks in the chain. Prefer smaller chunk. */ | |
cea2e8a9 GS |
1596 | static void * |
1597 | get_from_chain(MEM_SIZE size) | |
e8bc2b5c GS |
1598 | { |
1599 | struct chunk_chain_s *elt = chunk_chain, **oldp = &chunk_chain; | |
1600 | struct chunk_chain_s **oldgoodp = NULL; | |
1601 | long min_remain = LONG_MAX; | |
1602 | ||
1603 | while (elt) { | |
1604 | if (elt->size >= size) { | |
1605 | long remains = elt->size - size; | |
1606 | if (remains >= 0 && remains < min_remain) { | |
1607 | oldgoodp = oldp; | |
1608 | min_remain = remains; | |
1609 | } | |
1610 | if (remains == 0) { | |
1611 | break; | |
1612 | } | |
1613 | } | |
1614 | oldp = &( elt->next ); | |
1615 | elt = elt->next; | |
1616 | } | |
1617 | if (!oldgoodp) return NULL; | |
1618 | if (min_remain) { | |
1619 | void *ret = *oldgoodp; | |
1620 | struct chunk_chain_s *next = (*oldgoodp)->next; | |
1621 | ||
1622 | *oldgoodp = (struct chunk_chain_s *)((char*)ret + size); | |
1623 | (*oldgoodp)->size = min_remain; | |
1624 | (*oldgoodp)->next = next; | |
1625 | return ret; | |
1626 | } else { | |
1627 | void *ret = *oldgoodp; | |
1628 | *oldgoodp = (*oldgoodp)->next; | |
1629 | n_chunks--; | |
1630 | return ret; | |
1631 | } | |
1632 | } | |
1633 | ||
cea2e8a9 GS |
1634 | static void |
1635 | add_to_chain(void *p, MEM_SIZE size, MEM_SIZE chip) | |
e8bc2b5c GS |
1636 | { |
1637 | struct chunk_chain_s *next = chunk_chain; | |
1638 | char *cp = (char*)p; | |
1639 | ||
1640 | cp += chip; | |
1641 | chunk_chain = (struct chunk_chain_s *)cp; | |
1642 | chunk_chain->size = size - chip; | |
1643 | chunk_chain->next = next; | |
1644 | n_chunks++; | |
1645 | } | |
1646 | ||
cea2e8a9 GS |
1647 | static void * |
1648 | get_from_bigger_buckets(int bucket, MEM_SIZE size) | |
e8bc2b5c GS |
1649 | { |
1650 | int price = 1; | |
1651 | static int bucketprice[NBUCKETS]; | |
1652 | while (bucket <= max_bucket) { | |
1653 | /* We postpone stealing from bigger buckets until we want it | |
1654 | often enough. */ | |
1655 | if (nextf[bucket] && bucketprice[bucket]++ >= price) { | |
1656 | /* Steal it! */ | |
1657 | void *ret = (void*)(nextf[bucket] - 1 + CHUNK_SHIFT); | |
1658 | bucketprice[bucket] = 0; | |
1659 | if (((char*)nextf[bucket]) - M_OVERHEAD == last_op) { | |
1660 | last_op = NULL; /* Disable optimization */ | |
1661 | } | |
1662 | nextf[bucket] = nextf[bucket]->ov_next; | |
1663 | #ifdef DEBUGGING_MSTATS | |
1664 | nmalloc[bucket]--; | |
1665 | start_slack -= M_OVERHEAD; | |
1666 | #endif | |
d0bbed78 | 1667 | add_to_chain(ret, (BUCKET_SIZE_NO_SURPLUS(bucket) + |
e8bc2b5c GS |
1668 | POW2_OPTIMIZE_SURPLUS(bucket)), |
1669 | size); | |
1670 | return ret; | |
1671 | } | |
1672 | bucket++; | |
1673 | } | |
1674 | return NULL; | |
1675 | } | |
1676 | ||
cea2e8a9 | 1677 | static union overhead * |
c7374474 | 1678 | getpages(MEM_SIZE needed, int *nblksp, int bucket) |
fa423c5b | 1679 | { |
899be101 | 1680 | dVAR; |
fa423c5b IZ |
1681 | /* Need to do (possibly expensive) system call. Try to |
1682 | optimize it for rare calling. */ | |
1683 | MEM_SIZE require = needed - sbrked_remains; | |
1684 | char *cp; | |
1685 | union overhead *ovp; | |
c7374474 | 1686 | MEM_SIZE slack = 0; |
fa423c5b | 1687 | |
22f7c9c9 | 1688 | if (sbrk_goodness > 0) { |
575fbe19 | 1689 | if (!last_sbrk_top && require < (MEM_SIZE)FIRST_SBRK) |
fa423c5b | 1690 | require = FIRST_SBRK; |
575fbe19 | 1691 | else if (require < (MEM_SIZE)MIN_SBRK) require = MIN_SBRK; |
fa423c5b | 1692 | |
22f7c9c9 JH |
1693 | if (require < goodsbrk * MIN_SBRK_FRAC1000 / 1000) |
1694 | require = goodsbrk * MIN_SBRK_FRAC1000 / 1000; | |
fa423c5b IZ |
1695 | require = ((require - 1 + MIN_SBRK) / MIN_SBRK) * MIN_SBRK; |
1696 | } else { | |
1697 | require = needed; | |
1698 | last_sbrk_top = 0; | |
1699 | sbrked_remains = 0; | |
1700 | } | |
1701 | ||
1702 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1703 | "sbrk(%ld) for %ld-byte-long arena\n", | |
1704 | (long)require, (long) needed)); | |
1705 | cp = (char *)sbrk(require); | |
1706 | #ifdef DEBUGGING_MSTATS | |
1707 | sbrks++; | |
1708 | #endif | |
1709 | if (cp == last_sbrk_top) { | |
1710 | /* Common case, anything is fine. */ | |
22f7c9c9 | 1711 | sbrk_goodness++; |
fa423c5b | 1712 | ovp = (union overhead *) (cp - sbrked_remains); |
e9397286 | 1713 | last_op = cp - sbrked_remains; |
fa423c5b IZ |
1714 | sbrked_remains = require - (needed - sbrked_remains); |
1715 | } else if (cp == (char *)-1) { /* no more room! */ | |
1716 | ovp = (union overhead *)emergency_sbrk(needed); | |
1717 | if (ovp == (union overhead *)-1) | |
1718 | return 0; | |
e9397286 GS |
1719 | if (((char*)ovp) > last_op) { /* Cannot happen with current emergency_sbrk() */ |
1720 | last_op = 0; | |
1721 | } | |
fa423c5b IZ |
1722 | return ovp; |
1723 | } else { /* Non-continuous or first sbrk(). */ | |
1724 | long add = sbrked_remains; | |
1725 | char *newcp; | |
1726 | ||
1727 | if (sbrked_remains) { /* Put rest into chain, we | |
1728 | cannot use it right now. */ | |
1729 | add_to_chain((void*)(last_sbrk_top - sbrked_remains), | |
1730 | sbrked_remains, 0); | |
1731 | } | |
1732 | ||
1733 | /* Second, check alignment. */ | |
1734 | slack = 0; | |
1735 | ||
cd86ed9d | 1736 | #if !defined(atarist) /* on the atari we dont have to worry about this */ |
fa423c5b | 1737 | # ifndef I286 /* The sbrk(0) call on the I286 always returns the next segment */ |
5bbd1ef5 IZ |
1738 | /* WANTED_ALIGNMENT may be more than NEEDED_ALIGNMENT, but this may |
1739 | improve performance of memory access. */ | |
56431972 RB |
1740 | if (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)) { /* Not aligned. */ |
1741 | slack = WANTED_ALIGNMENT - (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)); | |
fa423c5b IZ |
1742 | add += slack; |
1743 | } | |
1744 | # endif | |
cd86ed9d | 1745 | #endif /* !atarist */ |
fa423c5b IZ |
1746 | |
1747 | if (add) { | |
1748 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1749 | "sbrk(%ld) to fix non-continuous/off-page sbrk:\n\t%ld for alignement,\t%ld were assumed to come from the tail of the previous sbrk\n", | |
1750 | (long)add, (long) slack, | |
1751 | (long) sbrked_remains)); | |
1752 | newcp = (char *)sbrk(add); | |
1753 | #if defined(DEBUGGING_MSTATS) | |
1754 | sbrks++; | |
1755 | sbrk_slack += add; | |
1756 | #endif | |
1757 | if (newcp != cp + require) { | |
1758 | /* Too bad: even rounding sbrk() is not continuous.*/ | |
1759 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1760 | "failed to fix bad sbrk()\n")); | |
1761 | #ifdef PACK_MALLOC | |
1762 | if (slack) { | |
741df71a | 1763 | MALLOC_UNLOCK; |
5bbd1ef5 | 1764 | fatalcroak("panic: Off-page sbrk\n"); |
fa423c5b IZ |
1765 | } |
1766 | #endif | |
1767 | if (sbrked_remains) { | |
1768 | /* Try again. */ | |
1769 | #if defined(DEBUGGING_MSTATS) | |
1770 | sbrk_slack += require; | |
1771 | #endif | |
1772 | require = needed; | |
1773 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1774 | "straight sbrk(%ld)\n", | |
1775 | (long)require)); | |
1776 | cp = (char *)sbrk(require); | |
1777 | #ifdef DEBUGGING_MSTATS | |
1778 | sbrks++; | |
1779 | #endif | |
1780 | if (cp == (char *)-1) | |
1781 | return 0; | |
1782 | } | |
22f7c9c9 | 1783 | sbrk_goodness = -1; /* Disable optimization! |
fa423c5b IZ |
1784 | Continue with not-aligned... */ |
1785 | } else { | |
1786 | cp += slack; | |
1787 | require += sbrked_remains; | |
1788 | } | |
1789 | } | |
1790 | ||
1791 | if (last_sbrk_top) { | |
22f7c9c9 | 1792 | sbrk_goodness -= SBRK_FAILURE_PRICE; |
fa423c5b IZ |
1793 | } |
1794 | ||
1795 | ovp = (union overhead *) cp; | |
1796 | /* | |
1797 | * Round up to minimum allocation size boundary | |
1798 | * and deduct from block count to reflect. | |
1799 | */ | |
1800 | ||
5bbd1ef5 | 1801 | # if NEEDED_ALIGNMENT > MEM_ALIGNBYTES |
56431972 | 1802 | if (PTR2UV(ovp) & (NEEDED_ALIGNMENT - 1)) |
5bbd1ef5 IZ |
1803 | fatalcroak("Misalignment of sbrk()\n"); |
1804 | else | |
1805 | # endif | |
fa423c5b | 1806 | #ifndef I286 /* Again, this should always be ok on an 80286 */ |
56431972 | 1807 | if (PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)) { |
fa423c5b | 1808 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
486ec47a | 1809 | "fixing sbrk(): %d bytes off machine alignment\n", |
56431972 RB |
1810 | (int)(PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)))); |
1811 | ovp = INT2PTR(union overhead *,(PTR2UV(ovp) + MEM_ALIGNBYTES) & | |
5bbd1ef5 | 1812 | (MEM_ALIGNBYTES - 1)); |
fa423c5b IZ |
1813 | (*nblksp)--; |
1814 | # if defined(DEBUGGING_MSTATS) | |
1815 | /* This is only approx. if TWO_POT_OPTIMIZE: */ | |
5bbd1ef5 | 1816 | sbrk_slack += (1 << (bucket >> BUCKET_POW2_SHIFT)); |
fa423c5b IZ |
1817 | # endif |
1818 | } | |
1819 | #endif | |
a0288114 | 1820 | ; /* Finish "else" */ |
fa423c5b | 1821 | sbrked_remains = require - needed; |
e9397286 | 1822 | last_op = cp; |
fa423c5b | 1823 | } |
febabd2a | 1824 | #if !defined(PLAIN_MALLOC) && !defined(NO_FANCY_MALLOC) |
22f7c9c9 | 1825 | emergency_buffer_last_req = 0; |
febabd2a | 1826 | #endif |
fa423c5b | 1827 | last_sbrk_top = cp + require; |
fa423c5b IZ |
1828 | #ifdef DEBUGGING_MSTATS |
1829 | goodsbrk += require; | |
1830 | #endif | |
1831 | return ovp; | |
1832 | } | |
1833 | ||
cea2e8a9 | 1834 | static int |
c7374474 | 1835 | getpages_adjacent(MEM_SIZE require) |
fa423c5b IZ |
1836 | { |
1837 | if (require <= sbrked_remains) { | |
1838 | sbrked_remains -= require; | |
1839 | } else { | |
1840 | char *cp; | |
1841 | ||
1842 | require -= sbrked_remains; | |
1843 | /* We do not try to optimize sbrks here, we go for place. */ | |
1844 | cp = (char*) sbrk(require); | |
1845 | #ifdef DEBUGGING_MSTATS | |
1846 | sbrks++; | |
1847 | goodsbrk += require; | |
1848 | #endif | |
1849 | if (cp == last_sbrk_top) { | |
1850 | sbrked_remains = 0; | |
1851 | last_sbrk_top = cp + require; | |
1852 | } else { | |
28ac10b1 IZ |
1853 | if (cp == (char*)-1) { /* Out of memory */ |
1854 | #ifdef DEBUGGING_MSTATS | |
1855 | goodsbrk -= require; | |
1856 | #endif | |
1857 | return 0; | |
1858 | } | |
fa423c5b IZ |
1859 | /* Report the failure: */ |
1860 | if (sbrked_remains) | |
1861 | add_to_chain((void*)(last_sbrk_top - sbrked_remains), | |
1862 | sbrked_remains, 0); | |
1863 | add_to_chain((void*)cp, require, 0); | |
22f7c9c9 | 1864 | sbrk_goodness -= SBRK_FAILURE_PRICE; |
fa423c5b IZ |
1865 | sbrked_remains = 0; |
1866 | last_sbrk_top = 0; | |
1867 | last_op = 0; | |
1868 | return 0; | |
1869 | } | |
1870 | } | |
1871 | ||
1872 | return 1; | |
1873 | } | |
1874 | ||
8d063cd8 LW |
1875 | /* |
1876 | * Allocate more memory to the indicated bucket. | |
1877 | */ | |
cea2e8a9 GS |
1878 | static void |
1879 | morecore(register int bucket) | |
8d063cd8 | 1880 | { |
899be101 | 1881 | dVAR; |
72aaf631 | 1882 | register union overhead *ovp; |
8d063cd8 | 1883 | register int rnu; /* 2^rnu bytes will be requested */ |
fa423c5b | 1884 | int nblks; /* become nblks blocks of the desired size */ |
bbce6d69 | 1885 | register MEM_SIZE siz, needed; |
22f7c9c9 | 1886 | static int were_called = 0; |
8d063cd8 LW |
1887 | |
1888 | if (nextf[bucket]) | |
1889 | return; | |
22f7c9c9 JH |
1890 | #ifndef NO_PERL_MALLOC_ENV |
1891 | if (!were_called) { | |
1892 | /* It's the our first time. Initialize ourselves */ | |
1893 | were_called = 1; /* Avoid a loop */ | |
1894 | if (!MallocCfg[MallocCfg_skip_cfg_env]) { | |
1895 | char *s = getenv("PERL_MALLOC_OPT"), *t = s, *off; | |
1896 | const char *opts = PERL_MALLOC_OPT_CHARS; | |
1897 | int changed = 0; | |
1898 | ||
1899 | while ( t && t[0] && t[1] == '=' | |
1900 | && ((off = strchr(opts, *t))) ) { | |
1901 | IV val = 0; | |
1902 | ||
1903 | t += 2; | |
1904 | while (*t <= '9' && *t >= '0') | |
1905 | val = 10*val + *t++ - '0'; | |
1906 | if (!*t || *t == ';') { | |
1907 | if (MallocCfg[off - opts] != val) | |
1908 | changed = 1; | |
1909 | MallocCfg[off - opts] = val; | |
1910 | if (*t) | |
1911 | t++; | |
1912 | } | |
1913 | } | |
1914 | if (t && *t) { | |
a0288114 | 1915 | write2("Unrecognized part of PERL_MALLOC_OPT: \""); |
22f7c9c9 | 1916 | write2(t); |
a0288114 | 1917 | write2("\"\n"); |
22f7c9c9 JH |
1918 | } |
1919 | if (changed) | |
1920 | MallocCfg[MallocCfg_cfg_env_read] = 1; | |
1921 | } | |
1922 | } | |
1923 | #endif | |
e8bc2b5c | 1924 | if (bucket == sizeof(MEM_SIZE)*8*BUCKETS_PER_POW2) { |
741df71a | 1925 | MALLOC_UNLOCK; |
d720c441 | 1926 | croak("%s", "Out of memory during ridiculously large request"); |
55497cff | 1927 | } |
d720c441 | 1928 | if (bucket > max_bucket) |
e8bc2b5c | 1929 | max_bucket = bucket; |
d720c441 | 1930 | |
e8bc2b5c GS |
1931 | rnu = ( (bucket <= (LOG_OF_MIN_ARENA << BUCKET_POW2_SHIFT)) |
1932 | ? LOG_OF_MIN_ARENA | |
1933 | : (bucket >> BUCKET_POW2_SHIFT) ); | |
1934 | /* This may be overwritten later: */ | |
1935 | nblks = 1 << (rnu - (bucket >> BUCKET_POW2_SHIFT)); /* how many blocks to get */ | |
1936 | needed = ((MEM_SIZE)1 << rnu) + POW2_OPTIMIZE_SURPLUS(bucket); | |
1937 | if (nextf[rnu << BUCKET_POW2_SHIFT]) { /* 2048b bucket. */ | |
1938 | ovp = nextf[rnu << BUCKET_POW2_SHIFT] - 1 + CHUNK_SHIFT; | |
1939 | nextf[rnu << BUCKET_POW2_SHIFT] | |
1940 | = nextf[rnu << BUCKET_POW2_SHIFT]->ov_next; | |
1941 | #ifdef DEBUGGING_MSTATS | |
1942 | nmalloc[rnu << BUCKET_POW2_SHIFT]--; | |
1943 | start_slack -= M_OVERHEAD; | |
1944 | #endif | |
1945 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1946 | "stealing %ld bytes from %ld arena\n", | |
1947 | (long) needed, (long) rnu << BUCKET_POW2_SHIFT)); | |
1948 | } else if (chunk_chain | |
1949 | && (ovp = (union overhead*) get_from_chain(needed))) { | |
1950 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1951 | "stealing %ld bytes from chain\n", | |
1952 | (long) needed)); | |
d720c441 IZ |
1953 | } else if ( (ovp = (union overhead*) |
1954 | get_from_bigger_buckets((rnu << BUCKET_POW2_SHIFT) + 1, | |
1955 | needed)) ) { | |
e8bc2b5c GS |
1956 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
1957 | "stealing %ld bytes from bigger buckets\n", | |
1958 | (long) needed)); | |
1959 | } else if (needed <= sbrked_remains) { | |
1960 | ovp = (union overhead *)(last_sbrk_top - sbrked_remains); | |
1961 | sbrked_remains -= needed; | |
1962 | last_op = (char*)ovp; | |
fa423c5b IZ |
1963 | } else |
1964 | ovp = getpages(needed, &nblks, bucket); | |
e8bc2b5c | 1965 | |
fa423c5b IZ |
1966 | if (!ovp) |
1967 | return; | |
22f7c9c9 | 1968 | FILL_DEADBEEF((unsigned char*)ovp, needed); |
e8bc2b5c | 1969 | |
8d063cd8 LW |
1970 | /* |
1971 | * Add new memory allocated to that on | |
1972 | * free list for this hash bucket. | |
1973 | */ | |
d0bbed78 | 1974 | siz = BUCKET_SIZE_NO_SURPLUS(bucket); /* No surplus if nblks > 1 */ |
cf5c4ad8 | 1975 | #ifdef PACK_MALLOC |
72aaf631 | 1976 | *(u_char*)ovp = bucket; /* Fill index. */ |
e8bc2b5c GS |
1977 | if (bucket <= MAX_PACKED) { |
1978 | ovp = (union overhead *) ((char*)ovp + BLK_SHIFT(bucket)); | |
1979 | nblks = N_BLKS(bucket); | |
cf5c4ad8 | 1980 | # ifdef DEBUGGING_MSTATS |
e8bc2b5c | 1981 | start_slack += BLK_SHIFT(bucket); |
cf5c4ad8 | 1982 | # endif |
e8bc2b5c GS |
1983 | } else if (bucket < LOG_OF_MIN_ARENA * BUCKETS_PER_POW2) { |
1984 | ovp = (union overhead *) ((char*)ovp + BLK_SHIFT(bucket)); | |
cf5c4ad8 | 1985 | siz -= sizeof(union overhead); |
72aaf631 | 1986 | } else ovp++; /* One chunk per block. */ |
e8bc2b5c | 1987 | #endif /* PACK_MALLOC */ |
72aaf631 | 1988 | nextf[bucket] = ovp; |
5f05dabc | 1989 | #ifdef DEBUGGING_MSTATS |
1990 | nmalloc[bucket] += nblks; | |
e8bc2b5c GS |
1991 | if (bucket > MAX_PACKED) { |
1992 | start_slack += M_OVERHEAD * nblks; | |
1993 | } | |
5f05dabc | 1994 | #endif |
22f7c9c9 | 1995 | |
8d063cd8 | 1996 | while (--nblks > 0) { |
72aaf631 MB |
1997 | ovp->ov_next = (union overhead *)((caddr_t)ovp + siz); |
1998 | ovp = (union overhead *)((caddr_t)ovp + siz); | |
8d063cd8 | 1999 | } |
8595d6f1 | 2000 | /* Not all sbrks return zeroed memory.*/ |
72aaf631 | 2001 | ovp->ov_next = (union overhead *)NULL; |
cf5c4ad8 | 2002 | #ifdef PACK_MALLOC |
e8bc2b5c GS |
2003 | if (bucket == 7*BUCKETS_PER_POW2) { /* Special case, explanation is above. */ |
2004 | union overhead *n_op = nextf[7*BUCKETS_PER_POW2]->ov_next; | |
2005 | nextf[7*BUCKETS_PER_POW2] = | |
2006 | (union overhead *)((caddr_t)nextf[7*BUCKETS_PER_POW2] | |
2007 | - sizeof(union overhead)); | |
2008 | nextf[7*BUCKETS_PER_POW2]->ov_next = n_op; | |
cf5c4ad8 | 2009 | } |
2010 | #endif /* !PACK_MALLOC */ | |
8d063cd8 LW |
2011 | } |
2012 | ||
94b6baf5 | 2013 | Free_t |
667e2948 | 2014 | Perl_mfree(Malloc_t where) |
cea2e8a9 | 2015 | { |
899be101 | 2016 | dVAR; |
ee0007ab | 2017 | register MEM_SIZE size; |
72aaf631 | 2018 | register union overhead *ovp; |
667e2948 | 2019 | char *cp = (char*)where; |
cf5c4ad8 | 2020 | #ifdef PACK_MALLOC |
2021 | u_char bucket; | |
2022 | #endif | |
8d063cd8 | 2023 | |
e8bc2b5c | 2024 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
2025 | "0x%"UVxf": (%05lu) free\n", |
2026 | PTR2UV(cp), (unsigned long)(PL_an++))); | |
45d8adaa | 2027 | |
cf5c4ad8 | 2028 | if (cp == NULL) |
2029 | return; | |
22f7c9c9 JH |
2030 | #ifdef DEBUGGING |
2031 | if (PTR2UV(cp) & (MEM_ALIGNBYTES - 1)) | |
2032 | croak("%s", "wrong alignment in free()"); | |
2033 | #endif | |
72aaf631 | 2034 | ovp = (union overhead *)((caddr_t)cp |
e8bc2b5c | 2035 | - sizeof (union overhead) * CHUNK_SHIFT); |
cf5c4ad8 | 2036 | #ifdef PACK_MALLOC |
72aaf631 | 2037 | bucket = OV_INDEX(ovp); |
cf5c4ad8 | 2038 | #endif |
e8bc2b5c GS |
2039 | #ifdef IGNORE_SMALL_BAD_FREE |
2040 | if ((bucket >= FIRST_BUCKET_WITH_CHECK) | |
2041 | && (OV_MAGIC(ovp, bucket) != MAGIC)) | |
2042 | #else | |
2043 | if (OV_MAGIC(ovp, bucket) != MAGIC) | |
2044 | #endif | |
2045 | { | |
68dc0745 | 2046 | static int bad_free_warn = -1; |
cf5c4ad8 | 2047 | if (bad_free_warn == -1) { |
e8cd8248 | 2048 | dTHX; |
5fd9e9a4 | 2049 | char *pbf = PerlEnv_getenv("PERL_BADFREE"); |
cf5c4ad8 | 2050 | bad_free_warn = (pbf) ? atoi(pbf) : 1; |
2051 | } | |
2052 | if (!bad_free_warn) | |
2053 | return; | |
8990e307 | 2054 | #ifdef RCHECK |
2ba999ec | 2055 | #ifdef PERL_CORE |
e8cd8248 GS |
2056 | { |
2057 | dTHX; | |
9b387841 NC |
2058 | if (!PERL_IS_ALIVE || !PL_curcop) |
2059 | Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s free() ignored (RMAGIC, PERL_CORE)", | |
2060 | ovp->ov_rmagic == RMAGIC - 1 ? | |
2061 | "Duplicate" : "Bad"); | |
2ba999ec | 2062 | } |
e476b1b5 | 2063 | #else |
52c6645e | 2064 | warn("%s free() ignored (RMAGIC)", |
2ba999ec | 2065 | ovp->ov_rmagic == RMAGIC - 1 ? "Duplicate" : "Bad"); |
e476b1b5 GS |
2066 | #endif |
2067 | #else | |
2068 | #ifdef PERL_CORE | |
2ba999ec GS |
2069 | { |
2070 | dTHX; | |
9b387841 NC |
2071 | if (!PERL_IS_ALIVE || !PL_curcop) |
2072 | Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s", "Bad free() ignored (PERL_CORE)"); | |
2ba999ec | 2073 | } |
8990e307 | 2074 | #else |
2ba999ec | 2075 | warn("%s", "Bad free() ignored"); |
8990e307 | 2076 | #endif |
e476b1b5 | 2077 | #endif |
8d063cd8 | 2078 | return; /* sanity */ |
e8bc2b5c | 2079 | } |
8d063cd8 | 2080 | #ifdef RCHECK |
3541dd58 | 2081 | ASSERT(ovp->ov_rmagic == RMAGIC, "chunk's head overwrite"); |
e8bc2b5c GS |
2082 | if (OV_INDEX(ovp) <= MAX_SHORT_BUCKET) { |
2083 | int i; | |
2084 | MEM_SIZE nbytes = ovp->ov_size + 1; | |
2085 | ||
d0bbed78 IZ |
2086 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
2087 | i = RMAGIC_SZ - i; | |
2088 | while (i--) { /* nbytes - RMAGIC_SZ is end of alloced area */ | |
2089 | ASSERT(((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] == RMAGIC_C, | |
2090 | "chunk's tail overwrite"); | |
e8bc2b5c GS |
2091 | } |
2092 | } | |
d0bbed78 IZ |
2093 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2094 | nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); | |
2095 | ASSERT(((u_int *)((caddr_t)ovp + nbytes))[-1] == RMAGIC, | |
2096 | "chunk's tail overwrite"); | |
2097 | FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nbytes), | |
2098 | BUCKET_SIZE(OV_INDEX(ovp)) - nbytes); | |
e8bc2b5c | 2099 | } |
d0bbed78 IZ |
2100 | FILL_DEADBEEF((unsigned char*)(ovp+CHUNK_SHIFT), |
2101 | BUCKET_SIZE_REAL(OV_INDEX(ovp)) + RMAGIC_SZ); | |
72aaf631 | 2102 | ovp->ov_rmagic = RMAGIC - 1; |
8d063cd8 | 2103 | #endif |
3541dd58 | 2104 | ASSERT(OV_INDEX(ovp) < NBUCKETS, "chunk's head overwrite"); |
72aaf631 | 2105 | size = OV_INDEX(ovp); |
4ad56ec9 IZ |
2106 | |
2107 | MALLOC_LOCK; | |
72aaf631 MB |
2108 | ovp->ov_next = nextf[size]; |
2109 | nextf[size] = ovp; | |
741df71a | 2110 | MALLOC_UNLOCK; |
8d063cd8 LW |
2111 | } |
2112 | ||
4ad56ec9 IZ |
2113 | /* There is no need to do any locking in realloc (with an exception of |
2114 | trying to grow in place if we are at the end of the chain). | |
2115 | If somebody calls us from a different thread with the same address, | |
2116 | we are sole anyway. */ | |
8d063cd8 | 2117 | |
2304df62 | 2118 | Malloc_t |
86058a2d | 2119 | Perl_realloc(void *mp, size_t nbytes) |
cea2e8a9 | 2120 | { |
899be101 | 2121 | dVAR; |
ee0007ab | 2122 | register MEM_SIZE onb; |
72aaf631 | 2123 | union overhead *ovp; |
d720c441 IZ |
2124 | char *res; |
2125 | int prev_bucket; | |
e8bc2b5c | 2126 | register int bucket; |
4ad56ec9 IZ |
2127 | int incr; /* 1 if does not fit, -1 if "easily" fits in a |
2128 | smaller bucket, otherwise 0. */ | |
352d5a3a | 2129 | char *cp = (char*)mp; |
8d063cd8 | 2130 | |
e8bc2b5c | 2131 | #if defined(DEBUGGING) || !defined(PERL_CORE) |
ee0007ab | 2132 | MEM_SIZE size = nbytes; |
45d8adaa | 2133 | |
45d8adaa | 2134 | if ((long)nbytes < 0) |
cea2e8a9 | 2135 | croak("%s", "panic: realloc"); |
45d8adaa | 2136 | #endif |
e8bc2b5c GS |
2137 | |
2138 | BARK_64K_LIMIT("Reallocation",nbytes,size); | |
2139 | if (!cp) | |
86058a2d | 2140 | return Perl_malloc(nbytes); |
45d8adaa | 2141 | |
72aaf631 | 2142 | ovp = (union overhead *)((caddr_t)cp |
e8bc2b5c GS |
2143 | - sizeof (union overhead) * CHUNK_SHIFT); |
2144 | bucket = OV_INDEX(ovp); | |
4ad56ec9 | 2145 | |
e8bc2b5c | 2146 | #ifdef IGNORE_SMALL_BAD_FREE |
4ad56ec9 IZ |
2147 | if ((bucket >= FIRST_BUCKET_WITH_CHECK) |
2148 | && (OV_MAGIC(ovp, bucket) != MAGIC)) | |
e8bc2b5c | 2149 | #else |
4ad56ec9 | 2150 | if (OV_MAGIC(ovp, bucket) != MAGIC) |
e8bc2b5c | 2151 | #endif |
4ad56ec9 IZ |
2152 | { |
2153 | static int bad_free_warn = -1; | |
2154 | if (bad_free_warn == -1) { | |
e8cd8248 | 2155 | dTHX; |
4ad56ec9 IZ |
2156 | char *pbf = PerlEnv_getenv("PERL_BADFREE"); |
2157 | bad_free_warn = (pbf) ? atoi(pbf) : 1; | |
2158 | } | |
2159 | if (!bad_free_warn) | |
bd61b366 | 2160 | return NULL; |
4ad56ec9 | 2161 | #ifdef RCHECK |
2ba999ec | 2162 | #ifdef PERL_CORE |
e8cd8248 GS |
2163 | { |
2164 | dTHX; | |
9b387841 NC |
2165 | if (!PERL_IS_ALIVE || !PL_curcop) |
2166 | Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%srealloc() %signored", | |
2167 | (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), | |
2168 | ovp->ov_rmagic == RMAGIC - 1 | |
2169 | ? "of freed memory " : ""); | |
2ba999ec | 2170 | } |
e476b1b5 | 2171 | #else |
22f7c9c9 JH |
2172 | warn2("%srealloc() %signored", |
2173 | (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), | |
2174 | ovp->ov_rmagic == RMAGIC - 1 ? "of freed memory " : ""); | |
e476b1b5 GS |
2175 | #endif |
2176 | #else | |
2177 | #ifdef PERL_CORE | |
2ba999ec GS |
2178 | { |
2179 | dTHX; | |
9b387841 NC |
2180 | if (!PERL_IS_ALIVE || !PL_curcop) |
2181 | Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s", | |
2182 | "Bad realloc() ignored"); | |
2ba999ec | 2183 | } |
4ad56ec9 | 2184 | #else |
2ba999ec | 2185 | warn("%s", "Bad realloc() ignored"); |
4ad56ec9 | 2186 | #endif |
e476b1b5 | 2187 | #endif |
bd61b366 | 2188 | return NULL; /* sanity */ |
4ad56ec9 IZ |
2189 | } |
2190 | ||
e8bc2b5c | 2191 | onb = BUCKET_SIZE_REAL(bucket); |
55497cff | 2192 | /* |
2193 | * avoid the copy if same size block. | |
486ec47a | 2194 | * We are not aggressive with boundary cases. Note that it might |
e8bc2b5c | 2195 | * (for a small number of cases) give false negative if |
55497cff | 2196 | * both new size and old one are in the bucket for |
e8bc2b5c GS |
2197 | * FIRST_BIG_POW2, but the new one is near the lower end. |
2198 | * | |
2199 | * We do not try to go to 1.5 times smaller bucket so far. | |
55497cff | 2200 | */ |
e8bc2b5c GS |
2201 | if (nbytes > onb) incr = 1; |
2202 | else { | |
2203 | #ifdef DO_NOT_TRY_HARDER_WHEN_SHRINKING | |
2204 | if ( /* This is a little bit pessimal if PACK_MALLOC: */ | |
2205 | nbytes > ( (onb >> 1) - M_OVERHEAD ) | |
2206 | # ifdef TWO_POT_OPTIMIZE | |
2207 | || (bucket == FIRST_BIG_POW2 && nbytes >= LAST_SMALL_BOUND ) | |
2208 | # endif | |
2209 | ) | |
2210 | #else /* !DO_NOT_TRY_HARDER_WHEN_SHRINKING */ | |
2211 | prev_bucket = ( (bucket > MAX_PACKED + 1) | |
2212 | ? bucket - BUCKETS_PER_POW2 | |
2213 | : bucket - 1); | |
2214 | if (nbytes > BUCKET_SIZE_REAL(prev_bucket)) | |
2215 | #endif /* !DO_NOT_TRY_HARDER_WHEN_SHRINKING */ | |
2216 | incr = 0; | |
2217 | else incr = -1; | |
2218 | } | |
2ce36478 | 2219 | #ifdef STRESS_REALLOC |
4ad56ec9 | 2220 | goto hard_way; |
2ce36478 | 2221 | #endif |
4ad56ec9 | 2222 | if (incr == 0) { |
852c2e52 | 2223 | inplace_label: |
a687059c LW |
2224 | #ifdef RCHECK |
2225 | /* | |
2226 | * Record new allocated size of block and | |
2227 | * bound space with magic numbers. | |
2228 | */ | |
72aaf631 | 2229 | if (OV_INDEX(ovp) <= MAX_SHORT_BUCKET) { |
e8bc2b5c GS |
2230 | int i, nb = ovp->ov_size + 1; |
2231 | ||
d0bbed78 IZ |
2232 | if ((i = nb & (RMAGIC_SZ-1))) { |
2233 | i = RMAGIC_SZ - i; | |
2234 | while (i--) { /* nb - RMAGIC_SZ is end of alloced area */ | |
2235 | ASSERT(((caddr_t)ovp + nb - RMAGIC_SZ)[i] == RMAGIC_C, "chunk's tail overwrite"); | |
e8bc2b5c GS |
2236 | } |
2237 | } | |
d0bbed78 IZ |
2238 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2239 | nb = (nb + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); | |
2240 | ASSERT(((u_int *)((caddr_t)ovp + nb))[-1] == RMAGIC, | |
2241 | "chunk's tail overwrite"); | |
2242 | FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nb), | |
2243 | BUCKET_SIZE(OV_INDEX(ovp)) - nb); | |
22f7c9c9 JH |
2244 | if (nbytes > ovp->ov_size + 1 - M_OVERHEAD) |
2245 | FILL_FEEDADAD((unsigned char*)cp + ovp->ov_size + 1 - M_OVERHEAD, | |
2246 | nbytes - (ovp->ov_size + 1 - M_OVERHEAD)); | |
2247 | else | |
2248 | FILL_DEADBEEF((unsigned char*)cp + nbytes, | |
d0bbed78 | 2249 | nb - M_OVERHEAD + RMAGIC_SZ - nbytes); |
a687059c LW |
2250 | /* |
2251 | * Convert amount of memory requested into | |
2252 | * closest block size stored in hash buckets | |
2253 | * which satisfies request. Account for | |
2254 | * space used per block for accounting. | |
2255 | */ | |
cf5c4ad8 | 2256 | nbytes += M_OVERHEAD; |
72aaf631 | 2257 | ovp->ov_size = nbytes - 1; |
d0bbed78 IZ |
2258 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
2259 | i = RMAGIC_SZ - i; | |
2260 | while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ | |
2261 | ((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] | |
e8bc2b5c GS |
2262 | = RMAGIC_C; |
2263 | } | |
d0bbed78 IZ |
2264 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2265 | nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ - 1); | |
2266 | ((u_int *)((caddr_t)ovp + nbytes))[-1] = RMAGIC; | |
a687059c LW |
2267 | } |
2268 | #endif | |
45d8adaa | 2269 | res = cp; |
42ac124e | 2270 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
2271 | "0x%"UVxf": (%05lu) realloc %ld bytes inplace\n", |
2272 | PTR2UV(res),(unsigned long)(PL_an++), | |
42ac124e | 2273 | (long)size)); |
e8bc2b5c GS |
2274 | } else if (incr == 1 && (cp - M_OVERHEAD == last_op) |
2275 | && (onb > (1 << LOG_OF_MIN_ARENA))) { | |
2276 | MEM_SIZE require, newarena = nbytes, pow; | |
2277 | int shiftr; | |
2278 | ||
2279 | POW2_OPTIMIZE_ADJUST(newarena); | |
2280 | newarena = newarena + M_OVERHEAD; | |
2281 | /* newarena = (newarena + 3) &~ 3; */ | |
2282 | shiftr = (newarena - 1) >> LOG_OF_MIN_ARENA; | |
2283 | pow = LOG_OF_MIN_ARENA + 1; | |
2284 | /* apart from this loop, this is O(1) */ | |
2285 | while (shiftr >>= 1) | |
2286 | pow++; | |
2287 | newarena = (1 << pow) + POW2_OPTIMIZE_SURPLUS(pow * BUCKETS_PER_POW2); | |
2288 | require = newarena - onb - M_OVERHEAD; | |
2289 | ||
4ad56ec9 IZ |
2290 | MALLOC_LOCK; |
2291 | if (cp - M_OVERHEAD == last_op /* We *still* are the last chunk */ | |
2292 | && getpages_adjacent(require)) { | |
e8bc2b5c | 2293 | #ifdef DEBUGGING_MSTATS |
fa423c5b IZ |
2294 | nmalloc[bucket]--; |
2295 | nmalloc[pow * BUCKETS_PER_POW2]++; | |
e8bc2b5c | 2296 | #endif |
532939df | 2297 | if (pow * BUCKETS_PER_POW2 > (MEM_SIZE)max_bucket) |
a73918ec | 2298 | max_bucket = pow * BUCKETS_PER_POW2; |
4d6cd4d8 | 2299 | *(cp - M_OVERHEAD) = pow * BUCKETS_PER_POW2; /* Fill index. */ |
4ad56ec9 | 2300 | MALLOC_UNLOCK; |
fa423c5b | 2301 | goto inplace_label; |
4ad56ec9 IZ |
2302 | } else { |
2303 | MALLOC_UNLOCK; | |
fa423c5b | 2304 | goto hard_way; |
4ad56ec9 | 2305 | } |
e8bc2b5c GS |
2306 | } else { |
2307 | hard_way: | |
42ac124e | 2308 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
2309 | "0x%"UVxf": (%05lu) realloc %ld bytes the hard way\n", |
2310 | PTR2UV(cp),(unsigned long)(PL_an++), | |
42ac124e | 2311 | (long)size)); |
86058a2d | 2312 | if ((res = (char*)Perl_malloc(nbytes)) == NULL) |
e8bc2b5c GS |
2313 | return (NULL); |
2314 | if (cp != res) /* common optimization */ | |
2315 | Copy(cp, res, (MEM_SIZE)(nbytes<onb?nbytes:onb), char); | |
4ad56ec9 | 2316 | Perl_mfree(cp); |
45d8adaa | 2317 | } |
2304df62 | 2318 | return ((Malloc_t)res); |
8d063cd8 LW |
2319 | } |
2320 | ||
cf5c4ad8 | 2321 | Malloc_t |
86058a2d | 2322 | Perl_calloc(register size_t elements, register size_t size) |
cf5c4ad8 | 2323 | { |
2324 | long sz = elements * size; | |
86058a2d | 2325 | Malloc_t p = Perl_malloc(sz); |
cf5c4ad8 | 2326 | |
2327 | if (p) { | |
2328 | memset((void*)p, 0, sz); | |
2329 | } | |
2330 | return p; | |
2331 | } | |
2332 | ||
4ad56ec9 IZ |
2333 | char * |
2334 | Perl_strdup(const char *s) | |
2335 | { | |
2336 | MEM_SIZE l = strlen(s); | |
b48f1ba5 | 2337 | char *s1 = (char *)Perl_malloc(l+1); |
4ad56ec9 | 2338 | |
667e2948 | 2339 | return (char *)CopyD(s, s1, (MEM_SIZE)(l+1), char); |
4ad56ec9 IZ |
2340 | } |
2341 | ||
2342 | #ifdef PERL_CORE | |
2343 | int | |
2344 | Perl_putenv(char *a) | |
2345 | { | |
2346 | /* Sometimes system's putenv conflicts with my_setenv() - this is system | |
2347 | malloc vs Perl's free(). */ | |
2348 | dTHX; | |
2349 | char *var; | |
2350 | char *val = a; | |
2351 | MEM_SIZE l; | |
2352 | char buf[80]; | |
2353 | ||
2354 | while (*val && *val != '=') | |
2355 | val++; | |
2356 | if (!*val) | |
2357 | return -1; | |
2358 | l = val - a; | |
2359 | if (l < sizeof(buf)) | |
2360 | var = buf; | |
2361 | else | |
667e2948 | 2362 | var = (char *)Perl_malloc(l + 1); |
4ad56ec9 | 2363 | Copy(a, var, l, char); |
b48f1ba5 GS |
2364 | var[l + 1] = 0; |
2365 | my_setenv(var, val+1); | |
4ad56ec9 IZ |
2366 | if (var != buf) |
2367 | Perl_mfree(var); | |
2368 | return 0; | |
2369 | } | |
2370 | # endif | |
2371 | ||
e8bc2b5c | 2372 | MEM_SIZE |
cea2e8a9 | 2373 | Perl_malloced_size(void *p) |
e8bc2b5c | 2374 | { |
44f8325f | 2375 | union overhead * const ovp = (union overhead *) |
8d6dde3e | 2376 | ((caddr_t)p - sizeof (union overhead) * CHUNK_SHIFT); |
b464bac0 | 2377 | const int bucket = OV_INDEX(ovp); |
7918f24d NC |
2378 | |
2379 | PERL_ARGS_ASSERT_MALLOCED_SIZE; | |
2380 | ||
8d6dde3e IZ |
2381 | #ifdef RCHECK |
2382 | /* The caller wants to have a complete control over the chunk, | |
2383 | disable the memory checking inside the chunk. */ | |
2384 | if (bucket <= MAX_SHORT_BUCKET) { | |
b464bac0 | 2385 | const MEM_SIZE size = BUCKET_SIZE_REAL(bucket); |
8d6dde3e | 2386 | ovp->ov_size = size + M_OVERHEAD - 1; |
d0bbed78 | 2387 | *((u_int *)((caddr_t)ovp + size + M_OVERHEAD - RMAGIC_SZ)) = RMAGIC; |
8d6dde3e IZ |
2388 | } |
2389 | #endif | |
e8bc2b5c GS |
2390 | return BUCKET_SIZE_REAL(bucket); |
2391 | } | |
2392 | ||
64107180 NC |
2393 | |
2394 | MEM_SIZE | |
2395 | Perl_malloc_good_size(size_t wanted) | |
2396 | { | |
2397 | return BUCKET_SIZE_REAL(S_ajust_size_and_find_bucket(&wanted)); | |
2398 | } | |
2399 | ||
e8bc2b5c GS |
2400 | # ifdef BUCKETS_ROOT2 |
2401 | # define MIN_EVEN_REPORT 6 | |
2402 | # else | |
2403 | # define MIN_EVEN_REPORT MIN_BUCKET | |
2404 | # endif | |
827e134a GS |
2405 | |
2406 | int | |
2407 | Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level) | |
8d063cd8 | 2408 | { |
df31f264 | 2409 | #ifdef DEBUGGING_MSTATS |
8d063cd8 LW |
2410 | register int i, j; |
2411 | register union overhead *p; | |
4ad56ec9 | 2412 | struct chunk_chain_s* nextchain; |
8d063cd8 | 2413 | |
7918f24d NC |
2414 | PERL_ARGS_ASSERT_GET_MSTATS; |
2415 | ||
827e134a GS |
2416 | buf->topbucket = buf->topbucket_ev = buf->topbucket_odd |
2417 | = buf->totfree = buf->total = buf->total_chain = 0; | |
2418 | ||
2419 | buf->minbucket = MIN_BUCKET; | |
4ad56ec9 | 2420 | MALLOC_LOCK; |
e8bc2b5c | 2421 | for (i = MIN_BUCKET ; i < NBUCKETS; i++) { |
8d063cd8 LW |
2422 | for (j = 0, p = nextf[i]; p; p = p->ov_next, j++) |
2423 | ; | |
827e134a GS |
2424 | if (i < buflen) { |
2425 | buf->nfree[i] = j; | |
2426 | buf->ntotal[i] = nmalloc[i]; | |
2427 | } | |
2428 | buf->totfree += j * BUCKET_SIZE_REAL(i); | |
2429 | buf->total += nmalloc[i] * BUCKET_SIZE_REAL(i); | |
e8bc2b5c | 2430 | if (nmalloc[i]) { |
827e134a GS |
2431 | i % 2 ? (buf->topbucket_odd = i) : (buf->topbucket_ev = i); |
2432 | buf->topbucket = i; | |
e8bc2b5c | 2433 | } |
c07a80fd | 2434 | } |
4ad56ec9 IZ |
2435 | nextchain = chunk_chain; |
2436 | while (nextchain) { | |
827e134a | 2437 | buf->total_chain += nextchain->size; |
4ad56ec9 IZ |
2438 | nextchain = nextchain->next; |
2439 | } | |
827e134a GS |
2440 | buf->total_sbrk = goodsbrk + sbrk_slack; |
2441 | buf->sbrks = sbrks; | |
22f7c9c9 | 2442 | buf->sbrk_good = sbrk_goodness; |
827e134a GS |
2443 | buf->sbrk_slack = sbrk_slack; |
2444 | buf->start_slack = start_slack; | |
2445 | buf->sbrked_remains = sbrked_remains; | |
4ad56ec9 | 2446 | MALLOC_UNLOCK; |
880b20b6 | 2447 | buf->nbuckets = NBUCKETS; |
827e134a GS |
2448 | if (level) { |
2449 | for (i = MIN_BUCKET ; i < NBUCKETS; i++) { | |
2450 | if (i >= buflen) | |
2451 | break; | |
d0bbed78 | 2452 | buf->bucket_mem_size[i] = BUCKET_SIZE_NO_SURPLUS(i); |
827e134a GS |
2453 | buf->bucket_available_size[i] = BUCKET_SIZE_REAL(i); |
2454 | } | |
2455 | } | |
3128eefe SR |
2456 | #else /* defined DEBUGGING_MSTATS */ |
2457 | PerlIO_printf(Perl_error_log, "perl not compiled with DEBUGGING_MSTATS\n"); | |
827e134a | 2458 | #endif /* defined DEBUGGING_MSTATS */ |
fe52b3b7 | 2459 | return 0; /* XXX unused */ |
827e134a GS |
2460 | } |
2461 | /* | |
2462 | * mstats - print out statistics about malloc | |
2463 | * | |
2464 | * Prints two lines of numbers, one showing the length of the free list | |
2465 | * for each size category, the second showing the number of mallocs - | |
2466 | * frees for each size category. | |
2467 | */ | |
2468 | void | |
6e9b0e18 | 2469 | Perl_dump_mstats(pTHX_ const char *s) |
827e134a GS |
2470 | { |
2471 | #ifdef DEBUGGING_MSTATS | |
880b20b6 | 2472 | register int i; |
827e134a | 2473 | perl_mstats_t buffer; |
880b20b6 IZ |
2474 | UV nf[NBUCKETS]; |
2475 | UV nt[NBUCKETS]; | |
827e134a | 2476 | |
7918f24d NC |
2477 | PERL_ARGS_ASSERT_DUMP_MSTATS; |
2478 | ||
827e134a GS |
2479 | buffer.nfree = nf; |
2480 | buffer.ntotal = nt; | |
2481 | get_mstats(&buffer, NBUCKETS, 0); | |
2482 | ||
c07a80fd | 2483 | if (s) |
bf49b057 | 2484 | PerlIO_printf(Perl_error_log, |
880b20b6 | 2485 | "Memory allocation statistics %s (buckets %"IVdf"(%"IVdf")..%"IVdf"(%"IVdf")\n", |
e8bc2b5c | 2486 | s, |
880b20b6 | 2487 | (IV)BUCKET_SIZE_REAL(MIN_BUCKET), |
d0bbed78 | 2488 | (IV)BUCKET_SIZE_NO_SURPLUS(MIN_BUCKET), |
880b20b6 | 2489 | (IV)BUCKET_SIZE_REAL(buffer.topbucket), |
d0bbed78 | 2490 | (IV)BUCKET_SIZE_NO_SURPLUS(buffer.topbucket)); |
880b20b6 | 2491 | PerlIO_printf(Perl_error_log, "%8"IVdf" free:", buffer.totfree); |
827e134a | 2492 | for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { |
bf49b057 | 2493 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2494 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2495 | ? " %5"UVuf |
2496 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), | |
827e134a | 2497 | buffer.nfree[i]); |
e8bc2b5c GS |
2498 | } |
2499 | #ifdef BUCKETS_ROOT2 | |
bf49b057 | 2500 | PerlIO_printf(Perl_error_log, "\n\t "); |
827e134a | 2501 | for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { |
bf49b057 | 2502 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2503 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2504 | ? " %5"UVuf |
2505 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), | |
827e134a | 2506 | buffer.nfree[i]); |
8d063cd8 | 2507 | } |
e8bc2b5c | 2508 | #endif |
880b20b6 | 2509 | PerlIO_printf(Perl_error_log, "\n%8"IVdf" used:", buffer.total - buffer.totfree); |
827e134a | 2510 | for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { |
bf49b057 | 2511 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2512 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2513 | ? " %5"IVdf |
2514 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), | |
827e134a | 2515 | buffer.ntotal[i] - buffer.nfree[i]); |
c07a80fd | 2516 | } |
e8bc2b5c | 2517 | #ifdef BUCKETS_ROOT2 |
bf49b057 | 2518 | PerlIO_printf(Perl_error_log, "\n\t "); |
827e134a | 2519 | for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { |
bf49b057 | 2520 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2521 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2522 | ? " %5"IVdf |
2523 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), | |
827e134a | 2524 | buffer.ntotal[i] - buffer.nfree[i]); |
e8bc2b5c GS |
2525 | } |
2526 | #endif | |
880b20b6 | 2527 | PerlIO_printf(Perl_error_log, "\nTotal sbrk(): %"IVdf"/%"IVdf":%"IVdf". Odd ends: pad+heads+chain+tail: %"IVdf"+%"IVdf"+%"IVdf"+%"IVdf".\n", |
827e134a GS |
2528 | buffer.total_sbrk, buffer.sbrks, buffer.sbrk_good, |
2529 | buffer.sbrk_slack, buffer.start_slack, | |
2530 | buffer.total_chain, buffer.sbrked_remains); | |
3128eefe SR |
2531 | #else /* DEBUGGING_MSTATS */ |
2532 | PerlIO_printf(Perl_error_log, "%s: perl not compiled with DEBUGGING_MSTATS\n",s); | |
df31f264 | 2533 | #endif /* DEBUGGING_MSTATS */ |
c07a80fd | 2534 | } |
cf5c4ad8 | 2535 | |
cf5c4ad8 | 2536 | #ifdef USE_PERL_SBRK |
2537 | ||
e94c1c05 | 2538 | # if defined(NeXT) || defined(__NeXT__) || defined(PURIFY) |
38ac2dc8 | 2539 | # define PERL_SBRK_VIA_MALLOC |
38ac2dc8 DD |
2540 | # endif |
2541 | ||
760ac839 | 2542 | # ifdef PERL_SBRK_VIA_MALLOC |
cf5c4ad8 | 2543 | |
2544 | /* it may seem schizophrenic to use perl's malloc and let it call system */ | |
2545 | /* malloc, the reason for that is only the 3.2 version of the OS that had */ | |
2546 | /* frequent core dumps within nxzonefreenolock. This sbrk routine put an */ | |
2547 | /* end to the cores */ | |
2548 | ||
38ac2dc8 DD |
2549 | # ifndef SYSTEM_ALLOC |
2550 | # define SYSTEM_ALLOC(a) malloc(a) | |
2551 | # endif | |
5bbd1ef5 IZ |
2552 | # ifndef SYSTEM_ALLOC_ALIGNMENT |
2553 | # define SYSTEM_ALLOC_ALIGNMENT MEM_ALIGNBYTES | |
2554 | # endif | |
cf5c4ad8 | 2555 | |
760ac839 | 2556 | # endif /* PERL_SBRK_VIA_MALLOC */ |
cf5c4ad8 | 2557 | |
2558 | static IV Perl_sbrk_oldchunk; | |
2559 | static long Perl_sbrk_oldsize; | |
2560 | ||
760ac839 LW |
2561 | # define PERLSBRK_32_K (1<<15) |
2562 | # define PERLSBRK_64_K (1<<16) | |
cf5c4ad8 | 2563 | |
b63effbb | 2564 | Malloc_t |
df0003d4 | 2565 | Perl_sbrk(int size) |
cf5c4ad8 | 2566 | { |
2567 | IV got; | |
2568 | int small, reqsize; | |
2569 | ||
2570 | if (!size) return 0; | |
55497cff | 2571 | #ifdef PERL_CORE |
cf5c4ad8 | 2572 | reqsize = size; /* just for the DEBUG_m statement */ |
2573 | #endif | |
57569e04 HM |
2574 | #ifdef PACK_MALLOC |
2575 | size = (size + 0x7ff) & ~0x7ff; | |
2576 | #endif | |
cf5c4ad8 | 2577 | if (size <= Perl_sbrk_oldsize) { |
2578 | got = Perl_sbrk_oldchunk; | |
2579 | Perl_sbrk_oldchunk += size; | |
2580 | Perl_sbrk_oldsize -= size; | |
2581 | } else { | |
2582 | if (size >= PERLSBRK_32_K) { | |
2583 | small = 0; | |
2584 | } else { | |
cf5c4ad8 | 2585 | size = PERLSBRK_64_K; |
2586 | small = 1; | |
2587 | } | |
5bbd1ef5 IZ |
2588 | # if NEEDED_ALIGNMENT > SYSTEM_ALLOC_ALIGNMENT |
2589 | size += NEEDED_ALIGNMENT - SYSTEM_ALLOC_ALIGNMENT; | |
2590 | # endif | |
cf5c4ad8 | 2591 | got = (IV)SYSTEM_ALLOC(size); |
5bbd1ef5 | 2592 | # if NEEDED_ALIGNMENT > SYSTEM_ALLOC_ALIGNMENT |
5a7d6335 | 2593 | got = (got + NEEDED_ALIGNMENT - 1) & ~(NEEDED_ALIGNMENT - 1); |
5bbd1ef5 | 2594 | # endif |
cf5c4ad8 | 2595 | if (small) { |
2596 | /* Chunk is small, register the rest for future allocs. */ | |
2597 | Perl_sbrk_oldchunk = got + reqsize; | |
2598 | Perl_sbrk_oldsize = size - reqsize; | |
2599 | } | |
2600 | } | |
2601 | ||
b900a521 JH |
2602 | DEBUG_m(PerlIO_printf(Perl_debug_log, "sbrk malloc size %ld (reqsize %ld), left size %ld, give addr 0x%"UVxf"\n", |
2603 | size, reqsize, Perl_sbrk_oldsize, PTR2UV(got))); | |
cf5c4ad8 | 2604 | |
2605 | return (void *)got; | |
2606 | } | |
2607 | ||
2608 | #endif /* ! defined USE_PERL_SBRK */ | |
66610fdd RGS |
2609 | |
2610 | /* | |
2611 | * Local variables: | |
2612 | * c-indentation-style: bsd | |
2613 | * c-basic-offset: 4 | |
2614 | * indent-tabs-mode: t | |
2615 | * End: | |
2616 | * | |
37442d52 RGS |
2617 | * ex: set ts=8 sts=4 sw=4 noet: |
2618 | */ |