Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | /* malloc.c |
8d063cd8 | 2 | * |
8d063cd8 LW |
3 | */ |
4 | ||
87c6202a | 5 | /* |
d31a8517 AT |
6 | * "'The Chamber of Records,' said Gimli. 'I guess that is where we now stand.'" |
7 | */ | |
8 | ||
9 | /* | |
741df71a IZ |
10 | Here are some notes on configuring Perl's malloc. (For non-perl |
11 | usage see below.) | |
87c6202a IZ |
12 | |
13 | There are two macros which serve as bulk disablers of advanced | |
14 | features of this malloc: NO_FANCY_MALLOC, PLAIN_MALLOC (undef by | |
15 | default). Look in the list of default values below to understand | |
16 | their exact effect. Defining NO_FANCY_MALLOC returns malloc.c to the | |
17 | state of the malloc in Perl 5.004. Additionally defining PLAIN_MALLOC | |
18 | returns it to the state as of Perl 5.000. | |
19 | ||
20 | Note that some of the settings below may be ignored in the code based | |
21 | on values of other macros. The PERL_CORE symbol is only defined when | |
22 | perl itself is being compiled (so malloc can make some assumptions | |
23 | about perl's facilities being available to it). | |
24 | ||
25 | Each config option has a short description, followed by its name, | |
26 | default value, and a comment about the default (if applicable). Some | |
27 | options take a precise value, while the others are just boolean. | |
28 | The boolean ones are listed first. | |
29 | ||
22f7c9c9 JH |
30 | # Read configuration settings from malloc_cfg.h |
31 | HAVE_MALLOC_CFG_H undef | |
32 | ||
87c6202a IZ |
33 | # Enable code for an emergency memory pool in $^M. See perlvar.pod |
34 | # for a description of $^M. | |
22f7c9c9 | 35 | PERL_EMERGENCY_SBRK (!PLAIN_MALLOC && (PERL_CORE || !NO_MALLOC_DYNAMIC_CFG)) |
87c6202a IZ |
36 | |
37 | # Enable code for printing memory statistics. | |
38 | DEBUGGING_MSTATS (!PLAIN_MALLOC && PERL_CORE) | |
39 | ||
40 | # Move allocation info for small buckets into separate areas. | |
41 | # Memory optimization (especially for small allocations, of the | |
42 | # less than 64 bytes). Since perl usually makes a large number | |
43 | # of small allocations, this is usually a win. | |
44 | PACK_MALLOC (!PLAIN_MALLOC && !RCHECK) | |
45 | ||
46 | # Add one page to big powers of two when calculating bucket size. | |
47 | # This is targeted at big allocations, as are common in image | |
48 | # processing. | |
49 | TWO_POT_OPTIMIZE !PLAIN_MALLOC | |
50 | ||
51 | # Use intermediate bucket sizes between powers-of-two. This is | |
52 | # generally a memory optimization, and a (small) speed pessimization. | |
53 | BUCKETS_ROOT2 !NO_FANCY_MALLOC | |
54 | ||
55 | # Do not check small deallocations for bad free(). Memory | |
56 | # and speed optimization, error reporting pessimization. | |
57 | IGNORE_SMALL_BAD_FREE (!NO_FANCY_MALLOC && !RCHECK) | |
58 | ||
59 | # Use table lookup to decide in which bucket a given allocation will go. | |
60 | SMALL_BUCKET_VIA_TABLE !NO_FANCY_MALLOC | |
61 | ||
38ac2dc8 DD |
62 | # Use a perl-defined sbrk() instead of the (presumably broken or |
63 | # missing) system-supplied sbrk(). | |
64 | USE_PERL_SBRK undef | |
65 | ||
66 | # Use system malloc() (or calloc() etc.) to emulate sbrk(). Normally | |
67 | # only used with broken sbrk()s. | |
87c6202a IZ |
68 | PERL_SBRK_VIA_MALLOC undef |
69 | ||
38ac2dc8 DD |
70 | # Which allocator to use if PERL_SBRK_VIA_MALLOC |
71 | SYSTEM_ALLOC(a) malloc(a) | |
72 | ||
9ee81ef6 | 73 | # Minimal alignment (in bytes, should be a power of 2) of SYSTEM_ALLOC |
5bbd1ef5 IZ |
74 | SYSTEM_ALLOC_ALIGNMENT MEM_ALIGNBYTES |
75 | ||
87c6202a IZ |
76 | # Disable memory overwrite checking with DEBUGGING. Memory and speed |
77 | # optimization, error reporting pessimization. | |
78 | NO_RCHECK undef | |
79 | ||
80 | # Enable memory overwrite checking with DEBUGGING. Memory and speed | |
81 | # pessimization, error reporting optimization | |
82 | RCHECK (DEBUGGING && !NO_RCHECK) | |
83 | ||
22f7c9c9 JH |
84 | # Do not overwrite uninit areas with DEBUGGING. Speed |
85 | # optimization, error reporting pessimization | |
86 | NO_MFILL undef | |
87 | ||
88 | # Overwrite uninit areas with DEBUGGING. Speed | |
89 | # pessimization, error reporting optimization | |
90 | MALLOC_FILL (DEBUGGING && !NO_RCHECK && !NO_MFILL) | |
91 | ||
92 | # Do not check overwritten uninit areas with DEBUGGING. Speed | |
93 | # optimization, error reporting pessimization | |
94 | NO_FILL_CHECK undef | |
95 | ||
96 | # Check overwritten uninit areas with DEBUGGING. Speed | |
97 | # pessimization, error reporting optimization | |
98 | MALLOC_FILL_CHECK (DEBUGGING && !NO_RCHECK && !NO_FILL_CHECK) | |
99 | ||
87c6202a IZ |
100 | # Failed allocations bigger than this size croak (if |
101 | # PERL_EMERGENCY_SBRK is enabled) without touching $^M. See | |
102 | # perlvar.pod for a description of $^M. | |
103 | BIG_SIZE (1<<16) # 64K | |
104 | ||
105 | # Starting from this power of two, add an extra page to the | |
106 | # size of the bucket. This enables optimized allocations of sizes | |
107 | # close to powers of 2. Note that the value is indexed at 0. | |
108 | FIRST_BIG_POW2 15 # 32K, 16K is used too often | |
109 | ||
110 | # Estimate of minimal memory footprint. malloc uses this value to | |
111 | # request the most reasonable largest blocks of memory from the system. | |
112 | FIRST_SBRK (48*1024) | |
113 | ||
114 | # Round up sbrk()s to multiples of this. | |
115 | MIN_SBRK 2048 | |
116 | ||
117 | # Round up sbrk()s to multiples of this percent of footprint. | |
118 | MIN_SBRK_FRAC 3 | |
119 | ||
22f7c9c9 JH |
120 | # Round up sbrk()s to multiples of this multiple of 1/1000 of footprint. |
121 | MIN_SBRK_FRAC1000 (10 * MIN_SBRK_FRAC) | |
122 | ||
87c6202a IZ |
123 | # Add this much memory to big powers of two to get the bucket size. |
124 | PERL_PAGESIZE 4096 | |
125 | ||
126 | # This many sbrk() discontinuities should be tolerated even | |
127 | # from the start without deciding that sbrk() is usually | |
128 | # discontinuous. | |
129 | SBRK_ALLOW_FAILURES 3 | |
130 | ||
131 | # This many continuous sbrk()s compensate for one discontinuous one. | |
132 | SBRK_FAILURE_PRICE 50 | |
133 | ||
28ac10b1 IZ |
134 | # Some configurations may ask for 12-byte-or-so allocations which |
135 | # require 8-byte alignment (?!). In such situation one needs to | |
136 | # define this to disable 12-byte bucket (will increase memory footprint) | |
137 | STRICT_ALIGNMENT undef | |
138 | ||
22f7c9c9 JH |
139 | # Do not allow configuration of runtime options at runtime |
140 | NO_MALLOC_DYNAMIC_CFG undef | |
141 | ||
142 | # Do not allow configuration of runtime options via $ENV{PERL_MALLOC_OPT} | |
143 | NO_PERL_MALLOC_ENV undef | |
144 | ||
145 | [The variable consists of ;-separated parts of the form CODE=VALUE | |
146 | with 1-character codes F, M, f, A, P, G, d, a, c for runtime | |
147 | configuration of FIRST_SBRK, MIN_SBRK, MIN_SBRK_FRAC1000, | |
148 | SBRK_ALLOW_FAILURES, SBRK_FAILURE_PRICE, sbrk_goodness, | |
149 | filldead, fillalive, fillcheck. The last 3 are for DEBUGGING | |
150 | build, and allow switching the tests for free()ed memory read, | |
151 | uninit memory reads, and free()ed memory write.] | |
152 | ||
87c6202a IZ |
153 | This implementation assumes that calling PerlIO_printf() does not |
154 | result in any memory allocation calls (used during a panic). | |
155 | ||
156 | */ | |
157 | ||
741df71a IZ |
158 | /* |
159 | If used outside of Perl environment, it may be useful to redefine | |
160 | the following macros (listed below with defaults): | |
161 | ||
162 | # Type of address returned by allocation functions | |
163 | Malloc_t void * | |
164 | ||
165 | # Type of size argument for allocation functions | |
166 | MEM_SIZE unsigned long | |
167 | ||
c7374474 GS |
168 | # size of void* |
169 | PTRSIZE 4 | |
170 | ||
741df71a IZ |
171 | # Maximal value in LONG |
172 | LONG_MAX 0x7FFFFFFF | |
173 | ||
174 | # Unsigned integer type big enough to keep a pointer | |
175 | UV unsigned long | |
176 | ||
22f7c9c9 JH |
177 | # Signed integer of the same sizeof() as UV |
178 | IV long | |
179 | ||
741df71a IZ |
180 | # Type of pointer with 1-byte granularity |
181 | caddr_t char * | |
182 | ||
183 | # Type returned by free() | |
184 | Free_t void | |
185 | ||
22f7c9c9 JH |
186 | # Conversion of pointer to integer |
187 | PTR2UV(ptr) ((UV)(ptr)) | |
188 | ||
189 | # Conversion of integer to pointer | |
190 | INT2PTR(type, i) ((type)(i)) | |
191 | ||
192 | # printf()-%-Conversion of UV to pointer | |
193 | UVuf "lu" | |
194 | ||
195 | # printf()-%-Conversion of UV to hex pointer | |
196 | UVxf "lx" | |
197 | ||
198 | # Alignment to use | |
199 | MEM_ALIGNBYTES 4 | |
200 | ||
5bbd1ef5 IZ |
201 | # Very fatal condition reporting function (cannot call any ) |
202 | fatalcroak(arg) write(2,arg,strlen(arg)) + exit(2) | |
203 | ||
741df71a IZ |
204 | # Fatal error reporting function |
205 | croak(format, arg) warn(idem) + exit(1) | |
206 | ||
b022d2d2 IZ |
207 | # Fatal error reporting function |
208 | croak2(format, arg1, arg2) warn2(idem) + exit(1) | |
209 | ||
741df71a IZ |
210 | # Error reporting function |
211 | warn(format, arg) fprintf(stderr, idem) | |
212 | ||
b022d2d2 IZ |
213 | # Error reporting function |
214 | warn2(format, arg1, arg2) fprintf(stderr, idem) | |
215 | ||
741df71a | 216 | # Locking/unlocking for MT operation |
efc57feb GS |
217 | MALLOC_LOCK MUTEX_LOCK(&PL_malloc_mutex) |
218 | MALLOC_UNLOCK MUTEX_UNLOCK(&PL_malloc_mutex) | |
741df71a IZ |
219 | |
220 | # Locking/unlocking mutex for MT operation | |
221 | MUTEX_LOCK(l) void | |
222 | MUTEX_UNLOCK(l) void | |
223 | */ | |
224 | ||
22f7c9c9 JH |
225 | #ifdef HAVE_MALLOC_CFG_H |
226 | # include "malloc_cfg.h" | |
227 | #endif | |
228 | ||
e8bc2b5c GS |
229 | #ifndef NO_FANCY_MALLOC |
230 | # ifndef SMALL_BUCKET_VIA_TABLE | |
231 | # define SMALL_BUCKET_VIA_TABLE | |
232 | # endif | |
233 | # ifndef BUCKETS_ROOT2 | |
234 | # define BUCKETS_ROOT2 | |
235 | # endif | |
236 | # ifndef IGNORE_SMALL_BAD_FREE | |
237 | # define IGNORE_SMALL_BAD_FREE | |
238 | # endif | |
3562ef9b IZ |
239 | #endif |
240 | ||
e8bc2b5c GS |
241 | #ifndef PLAIN_MALLOC /* Bulk enable features */ |
242 | # ifndef PACK_MALLOC | |
243 | # define PACK_MALLOC | |
244 | # endif | |
245 | # ifndef TWO_POT_OPTIMIZE | |
246 | # define TWO_POT_OPTIMIZE | |
247 | # endif | |
22f7c9c9 | 248 | # if (defined(PERL_CORE) || !defined(NO_MALLOC_DYNAMIC_CFG)) && !defined(PERL_EMERGENCY_SBRK) |
d720c441 | 249 | # define PERL_EMERGENCY_SBRK |
e8bc2b5c GS |
250 | # endif |
251 | # if defined(PERL_CORE) && !defined(DEBUGGING_MSTATS) | |
252 | # define DEBUGGING_MSTATS | |
253 | # endif | |
254 | #endif | |
255 | ||
256 | #define MIN_BUC_POW2 (sizeof(void*) > 4 ? 3 : 2) /* Allow for 4-byte arena. */ | |
257 | #define MIN_BUCKET (MIN_BUC_POW2 * BUCKETS_PER_POW2) | |
258 | ||
61ae2fbf | 259 | #if !(defined(I286) || defined(atarist) || defined(__MINT__)) |
e8bc2b5c GS |
260 | /* take 2k unless the block is bigger than that */ |
261 | # define LOG_OF_MIN_ARENA 11 | |
262 | #else | |
263 | /* take 16k unless the block is bigger than that | |
264 | (80286s like large segments!), probably good on the atari too */ | |
265 | # define LOG_OF_MIN_ARENA 14 | |
266 | #endif | |
267 | ||
8d063cd8 | 268 | #ifndef lint |
1944739a IZ |
269 | # if defined(DEBUGGING) && !defined(NO_RCHECK) |
270 | # define RCHECK | |
271 | # endif | |
22f7c9c9 JH |
272 | # if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_MFILL) && !defined(MALLOC_FILL) |
273 | # define MALLOC_FILL | |
274 | # endif | |
275 | # if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_FILL_CHECK) && !defined(MALLOC_FILL_CHECK) | |
276 | # define MALLOC_FILL_CHECK | |
277 | # endif | |
e8bc2b5c GS |
278 | # if defined(RCHECK) && defined(IGNORE_SMALL_BAD_FREE) |
279 | # undef IGNORE_SMALL_BAD_FREE | |
280 | # endif | |
8d063cd8 LW |
281 | /* |
282 | * malloc.c (Caltech) 2/21/82 | |
283 | * Chris Kingsley, kingsley@cit-20. | |
284 | * | |
285 | * This is a very fast storage allocator. It allocates blocks of a small | |
286 | * number of different sizes, and keeps free lists of each size. Blocks that | |
287 | * don't exactly fit are passed up to the next larger size. In this | |
288 | * implementation, the available sizes are 2^n-4 (or 2^n-12) bytes long. | |
cf5c4ad8 | 289 | * If PACK_MALLOC is defined, small blocks are 2^n bytes long. |
8d063cd8 | 290 | * This is designed for use in a program that uses vast quantities of memory, |
741df71a IZ |
291 | * but bombs when it runs out. |
292 | * | |
4eb8286e | 293 | * Modifications Copyright Ilya Zakharevich 1996-99. |
741df71a IZ |
294 | * |
295 | * Still very quick, but much more thrifty. (Std config is 10% slower | |
296 | * than it was, and takes 67% of old heap size for typical usage.) | |
297 | * | |
298 | * Allocations of small blocks are now table-driven to many different | |
299 | * buckets. Sizes of really big buckets are increased to accomodata | |
300 | * common size=power-of-2 blocks. Running-out-of-memory is made into | |
301 | * an exception. Deeply configurable and thread-safe. | |
302 | * | |
8d063cd8 LW |
303 | */ |
304 | ||
d720c441 IZ |
305 | #ifdef PERL_CORE |
306 | # include "EXTERN.h" | |
4ad56ec9 | 307 | # define PERL_IN_MALLOC_C |
d720c441 | 308 | # include "perl.h" |
cea2e8a9 GS |
309 | # if defined(PERL_IMPLICIT_CONTEXT) |
310 | # define croak Perl_croak_nocontext | |
b022d2d2 | 311 | # define croak2 Perl_croak_nocontext |
cea2e8a9 | 312 | # define warn Perl_warn_nocontext |
b022d2d2 IZ |
313 | # define warn2 Perl_warn_nocontext |
314 | # else | |
315 | # define croak2 croak | |
316 | # define warn2 warn | |
cea2e8a9 | 317 | # endif |
22f7c9c9 JH |
318 | # if defined(USE_5005THREADS) || defined(USE_ITHREADS) |
319 | # define PERL_MAYBE_ALIVE PL_thr_key | |
320 | # else | |
321 | # define PERL_MAYBE_ALIVE 1 | |
322 | # endif | |
d720c441 IZ |
323 | #else |
324 | # ifdef PERL_FOR_X2P | |
325 | # include "../EXTERN.h" | |
326 | # include "../perl.h" | |
327 | # else | |
328 | # include <stdlib.h> | |
329 | # include <stdio.h> | |
330 | # include <memory.h> | |
22f7c9c9 JH |
331 | # ifdef OS2 |
332 | # include <io.h> | |
333 | # endif | |
334 | # include <string.h> | |
d720c441 IZ |
335 | # ifndef Malloc_t |
336 | # define Malloc_t void * | |
337 | # endif | |
c7374474 GS |
338 | # ifndef PTRSIZE |
339 | # define PTRSIZE 4 | |
340 | # endif | |
d720c441 IZ |
341 | # ifndef MEM_SIZE |
342 | # define MEM_SIZE unsigned long | |
343 | # endif | |
344 | # ifndef LONG_MAX | |
345 | # define LONG_MAX 0x7FFFFFFF | |
346 | # endif | |
347 | # ifndef UV | |
348 | # define UV unsigned long | |
349 | # endif | |
22f7c9c9 JH |
350 | # ifndef IV |
351 | # define IV long | |
352 | # endif | |
d720c441 IZ |
353 | # ifndef caddr_t |
354 | # define caddr_t char * | |
355 | # endif | |
356 | # ifndef Free_t | |
357 | # define Free_t void | |
358 | # endif | |
359 | # define Copy(s,d,n,t) (void)memcpy((char*)(d),(char*)(s), (n) * sizeof(t)) | |
360 | # define PerlEnv_getenv getenv | |
361 | # define PerlIO_printf fprintf | |
362 | # define PerlIO_stderr() stderr | |
22f7c9c9 JH |
363 | # define PerlIO_puts(f,s) fputs(s,f) |
364 | # ifndef INT2PTR | |
365 | # define INT2PTR(t,i) ((t)(i)) | |
366 | # endif | |
367 | # ifndef PTR2UV | |
368 | # define PTR2UV(p) ((UV)(p)) | |
369 | # endif | |
370 | # ifndef UVuf | |
371 | # define UVuf "lu" | |
372 | # endif | |
373 | # ifndef UVxf | |
374 | # define UVxf "lx" | |
375 | # endif | |
376 | # ifndef Nullch | |
377 | # define Nullch NULL | |
378 | # endif | |
379 | # ifndef MEM_ALIGNBYTES | |
380 | # define MEM_ALIGNBYTES 4 | |
381 | # endif | |
d720c441 | 382 | # endif |
e8bc2b5c | 383 | # ifndef croak /* make depend */ |
741df71a | 384 | # define croak(mess, arg) (warn((mess), (arg)), exit(1)) |
d720c441 | 385 | # endif |
b022d2d2 IZ |
386 | # ifndef croak2 /* make depend */ |
387 | # define croak2(mess, arg1, arg2) (warn2((mess), (arg1), (arg2)), exit(1)) | |
388 | # endif | |
d720c441 | 389 | # ifndef warn |
741df71a | 390 | # define warn(mess, arg) fprintf(stderr, (mess), (arg)) |
e8bc2b5c | 391 | # endif |
0b415716 | 392 | # ifndef warn2 |
22f7c9c9 | 393 | # define warn2(mess, arg1, arg2) fprintf(stderr, (mess), (arg1), (arg2)) |
b022d2d2 | 394 | # endif |
e8bc2b5c GS |
395 | # ifdef DEBUG_m |
396 | # undef DEBUG_m | |
397 | # endif | |
398 | # define DEBUG_m(a) | |
399 | # ifdef DEBUGGING | |
400 | # undef DEBUGGING | |
401 | # endif | |
cea2e8a9 GS |
402 | # ifndef pTHX |
403 | # define pTHX void | |
404 | # define pTHX_ | |
afb90382 | 405 | # ifdef HASATTRIBUTE |
44dbb695 | 406 | # define dTHX extern int Perl___notused PERL_UNUSED_DECL |
afb90382 MS |
407 | # else |
408 | # define dTHX extern int Perl___notused | |
409 | # endif | |
cea2e8a9 GS |
410 | # define WITH_THX(s) s |
411 | # endif | |
c5be433b GS |
412 | # ifndef PERL_GET_INTERP |
413 | # define PERL_GET_INTERP PL_curinterp | |
414 | # endif | |
22f7c9c9 | 415 | # define PERL_MAYBE_ALIVE 1 |
4ad56ec9 IZ |
416 | # ifndef Perl_malloc |
417 | # define Perl_malloc malloc | |
418 | # endif | |
419 | # ifndef Perl_mfree | |
420 | # define Perl_mfree free | |
421 | # endif | |
422 | # ifndef Perl_realloc | |
423 | # define Perl_realloc realloc | |
424 | # endif | |
425 | # ifndef Perl_calloc | |
426 | # define Perl_calloc calloc | |
427 | # endif | |
428 | # ifndef Perl_strdup | |
429 | # define Perl_strdup strdup | |
430 | # endif | |
22f7c9c9 | 431 | #endif /* defined PERL_CORE */ |
e8bc2b5c GS |
432 | |
433 | #ifndef MUTEX_LOCK | |
434 | # define MUTEX_LOCK(l) | |
435 | #endif | |
436 | ||
437 | #ifndef MUTEX_UNLOCK | |
438 | # define MUTEX_UNLOCK(l) | |
439 | #endif | |
440 | ||
741df71a | 441 | #ifndef MALLOC_LOCK |
efc57feb | 442 | # define MALLOC_LOCK MUTEX_LOCK(&PL_malloc_mutex) |
741df71a IZ |
443 | #endif |
444 | ||
445 | #ifndef MALLOC_UNLOCK | |
efc57feb | 446 | # define MALLOC_UNLOCK MUTEX_UNLOCK(&PL_malloc_mutex) |
741df71a IZ |
447 | #endif |
448 | ||
5bbd1ef5 IZ |
449 | # ifndef fatalcroak /* make depend */ |
450 | # define fatalcroak(mess) (write(2, (mess), strlen(mess)), exit(2)) | |
451 | # endif | |
452 | ||
760ac839 | 453 | #ifdef DEBUGGING |
e8bc2b5c | 454 | # undef DEBUG_m |
51a5ed28 | 455 | # define DEBUG_m(a) \ |
0b250b9e | 456 | STMT_START { \ |
22f7c9c9 | 457 | if (PERL_MAYBE_ALIVE && PERL_GET_THX) { \ |
51a5ed28 HS |
458 | dTHX; \ |
459 | if (DEBUG_m_TEST) { \ | |
460 | PL_debug &= ~DEBUG_m_FLAG; \ | |
461 | a; \ | |
462 | PL_debug |= DEBUG_m_FLAG; \ | |
463 | } \ | |
464 | } \ | |
0b250b9e | 465 | } STMT_END |
760ac839 LW |
466 | #endif |
467 | ||
e476b1b5 GS |
468 | #ifdef PERL_IMPLICIT_CONTEXT |
469 | # define PERL_IS_ALIVE aTHX | |
470 | #else | |
471 | # define PERL_IS_ALIVE TRUE | |
472 | #endif | |
473 | ||
474 | ||
e9397286 GS |
475 | /* |
476 | * Layout of memory: | |
477 | * ~~~~~~~~~~~~~~~~ | |
478 | * The memory is broken into "blocks" which occupy multiples of 2K (and | |
479 | * generally speaking, have size "close" to a power of 2). The addresses | |
480 | * of such *unused* blocks are kept in nextf[i] with big enough i. (nextf | |
481 | * is an array of linked lists.) (Addresses of used blocks are not known.) | |
482 | * | |
4ad56ec9 | 483 | * Moreover, since the algorithm may try to "bite" smaller blocks out |
e9397286 GS |
484 | * of unused bigger ones, there are also regions of "irregular" size, |
485 | * managed separately, by a linked list chunk_chain. | |
486 | * | |
487 | * The third type of storage is the sbrk()ed-but-not-yet-used space, its | |
488 | * end and size are kept in last_sbrk_top and sbrked_remains. | |
489 | * | |
490 | * Growing blocks "in place": | |
491 | * ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
492 | * The address of the block with the greatest address is kept in last_op | |
493 | * (if not known, last_op is 0). If it is known that the memory above | |
494 | * last_op is not continuous, or contains a chunk from chunk_chain, | |
495 | * last_op is set to 0. | |
496 | * | |
497 | * The chunk with address last_op may be grown by expanding into | |
498 | * sbrk()ed-but-not-yet-used space, or trying to sbrk() more continuous | |
499 | * memory. | |
500 | * | |
501 | * Management of last_op: | |
502 | * ~~~~~~~~~~~~~~~~~~~~~ | |
503 | * | |
504 | * free() never changes the boundaries of blocks, so is not relevant. | |
505 | * | |
506 | * The only way realloc() may change the boundaries of blocks is if it | |
507 | * grows a block "in place". However, in the case of success such a | |
508 | * chunk is automatically last_op, and it remains last_op. In the case | |
509 | * of failure getpages_adjacent() clears last_op. | |
510 | * | |
511 | * malloc() may change blocks by calling morecore() only. | |
512 | * | |
513 | * morecore() may create new blocks by: | |
514 | * a) biting pieces from chunk_chain (cannot create one above last_op); | |
515 | * b) biting a piece from an unused block (if block was last_op, this | |
516 | * may create a chunk from chain above last_op, thus last_op is | |
517 | * invalidated in such a case). | |
518 | * c) biting of sbrk()ed-but-not-yet-used space. This creates | |
519 | * a block which is last_op. | |
520 | * d) Allocating new pages by calling getpages(); | |
521 | * | |
522 | * getpages() creates a new block. It marks last_op at the bottom of | |
523 | * the chunk of memory it returns. | |
524 | * | |
525 | * Active pages footprint: | |
526 | * ~~~~~~~~~~~~~~~~~~~~~~ | |
527 | * Note that we do not need to traverse the lists in nextf[i], just take | |
528 | * the first element of this list. However, we *need* to traverse the | |
529 | * list in chunk_chain, but most the time it should be a very short one, | |
530 | * so we do not step on a lot of pages we are not going to use. | |
531 | * | |
532 | * Flaws: | |
533 | * ~~~~~ | |
534 | * get_from_bigger_buckets(): forget to increment price => Quite | |
535 | * aggressive. | |
536 | */ | |
537 | ||
135863df AB |
538 | /* I don't much care whether these are defined in sys/types.h--LAW */ |
539 | ||
540 | #define u_char unsigned char | |
541 | #define u_int unsigned int | |
56431972 RB |
542 | /* |
543 | * I removed the definition of u_bigint which appeared to be u_bigint = UV | |
544 | * u_bigint was only used in TWOK_MASKED and TWOK_SHIFT | |
545 | * where I have used PTR2UV. RMB | |
546 | */ | |
135863df | 547 | #define u_short unsigned short |
8d063cd8 | 548 | |
cf5c4ad8 | 549 | /* 286 and atarist like big chunks, which gives too much overhead. */ |
61ae2fbf | 550 | #if (defined(RCHECK) || defined(I286) || defined(atarist) || defined(__MINT__)) && defined(PACK_MALLOC) |
e8bc2b5c | 551 | # undef PACK_MALLOC |
cf5c4ad8 | 552 | #endif |
553 | ||
8d063cd8 | 554 | /* |
cf5c4ad8 | 555 | * The description below is applicable if PACK_MALLOC is not defined. |
556 | * | |
8d063cd8 LW |
557 | * The overhead on a block is at least 4 bytes. When free, this space |
558 | * contains a pointer to the next free block, and the bottom two bits must | |
559 | * be zero. When in use, the first byte is set to MAGIC, and the second | |
560 | * byte is the size index. The remaining bytes are for alignment. | |
561 | * If range checking is enabled and the size of the block fits | |
562 | * in two bytes, then the top two bytes hold the size of the requested block | |
563 | * plus the range checking words, and the header word MINUS ONE. | |
564 | */ | |
565 | union overhead { | |
566 | union overhead *ov_next; /* when free */ | |
85e6fe83 | 567 | #if MEM_ALIGNBYTES > 4 |
c623bd54 | 568 | double strut; /* alignment problems */ |
a687059c | 569 | #endif |
8d063cd8 | 570 | struct { |
00ff3b56 JH |
571 | /* |
572 | * Keep the ovu_index and ovu_magic in this order, having a char | |
573 | * field first gives alignment indigestion in some systems, such as | |
574 | * MachTen. | |
575 | */ | |
8d063cd8 | 576 | u_char ovu_index; /* bucket # */ |
b72ff565 | 577 | u_char ovu_magic; /* magic number */ |
8d063cd8 | 578 | #ifdef RCHECK |
d0bbed78 | 579 | /* Subtract one to fit into u_short for an extra bucket */ |
22f7c9c9 | 580 | u_short ovu_size; /* block size (requested + overhead - 1) */ |
8d063cd8 LW |
581 | u_int ovu_rmagic; /* range magic number */ |
582 | #endif | |
583 | } ovu; | |
584 | #define ov_magic ovu.ovu_magic | |
585 | #define ov_index ovu.ovu_index | |
586 | #define ov_size ovu.ovu_size | |
587 | #define ov_rmagic ovu.ovu_rmagic | |
588 | }; | |
589 | ||
590 | #define MAGIC 0xff /* magic # on accounting info */ | |
591 | #define RMAGIC 0x55555555 /* magic # on range info */ | |
e8bc2b5c GS |
592 | #define RMAGIC_C 0x55 /* magic # on range info */ |
593 | ||
8d063cd8 | 594 | #ifdef RCHECK |
d0bbed78 | 595 | # define RMAGIC_SZ sizeof (u_int) /* Overhead at end of bucket */ |
c2a5c2d2 | 596 | # ifdef TWO_POT_OPTIMIZE |
22f7c9c9 | 597 | # define MAX_SHORT_BUCKET (12 * BUCKETS_PER_POW2) /* size-1 fits in short */ |
c2a5c2d2 | 598 | # else |
e8bc2b5c | 599 | # define MAX_SHORT_BUCKET (13 * BUCKETS_PER_POW2) |
c2a5c2d2 | 600 | # endif |
8d063cd8 | 601 | #else |
d0bbed78 | 602 | # define RMAGIC_SZ 0 |
8d063cd8 LW |
603 | #endif |
604 | ||
e8bc2b5c GS |
605 | #if !defined(PACK_MALLOC) && defined(BUCKETS_ROOT2) |
606 | # undef BUCKETS_ROOT2 | |
607 | #endif | |
608 | ||
609 | #ifdef BUCKETS_ROOT2 | |
610 | # define BUCKET_TABLE_SHIFT 2 | |
611 | # define BUCKET_POW2_SHIFT 1 | |
612 | # define BUCKETS_PER_POW2 2 | |
613 | #else | |
614 | # define BUCKET_TABLE_SHIFT MIN_BUC_POW2 | |
615 | # define BUCKET_POW2_SHIFT 0 | |
616 | # define BUCKETS_PER_POW2 1 | |
617 | #endif | |
618 | ||
274c7500 IZ |
619 | #if !defined(MEM_ALIGNBYTES) || ((MEM_ALIGNBYTES > 4) && !defined(STRICT_ALIGNMENT)) |
620 | /* Figure out the alignment of void*. */ | |
621 | struct aligner { | |
622 | char c; | |
623 | void *p; | |
624 | }; | |
625 | # define ALIGN_SMALL ((int)((caddr_t)&(((struct aligner*)0)->p))) | |
626 | #else | |
627 | # define ALIGN_SMALL MEM_ALIGNBYTES | |
628 | #endif | |
629 | ||
630 | #define IF_ALIGN_8(yes,no) ((ALIGN_SMALL>4) ? (yes) : (no)) | |
631 | ||
e8bc2b5c GS |
632 | #ifdef BUCKETS_ROOT2 |
633 | # define MAX_BUCKET_BY_TABLE 13 | |
634 | static u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = | |
635 | { | |
636 | 0, 0, 0, 0, 4, 4, 8, 12, 16, 24, 32, 48, 64, 80, | |
637 | }; | |
d0bbed78 | 638 | # define BUCKET_SIZE_NO_SURPLUS(i) ((i) % 2 ? buck_size[i] : (1 << ((i) >> BUCKET_POW2_SHIFT))) |
e8bc2b5c GS |
639 | # define BUCKET_SIZE_REAL(i) ((i) <= MAX_BUCKET_BY_TABLE \ |
640 | ? buck_size[i] \ | |
641 | : ((1 << ((i) >> BUCKET_POW2_SHIFT)) \ | |
642 | - MEM_OVERHEAD(i) \ | |
643 | + POW2_OPTIMIZE_SURPLUS(i))) | |
644 | #else | |
d0bbed78 IZ |
645 | # define BUCKET_SIZE_NO_SURPLUS(i) (1 << ((i) >> BUCKET_POW2_SHIFT)) |
646 | # define BUCKET_SIZE(i) (BUCKET_SIZE_NO_SURPLUS(i) + POW2_OPTIMIZE_SURPLUS(i)) | |
647 | # define BUCKET_SIZE_REAL(i) (BUCKET_SIZE(i) - MEM_OVERHEAD(i)) | |
e8bc2b5c GS |
648 | #endif |
649 | ||
650 | ||
cf5c4ad8 | 651 | #ifdef PACK_MALLOC |
4ad56ec9 IZ |
652 | /* In this case there are several possible layout of arenas depending |
653 | * on the size. Arenas are of sizes multiple to 2K, 2K-aligned, and | |
654 | * have a size close to a power of 2. | |
655 | * | |
656 | * Arenas of the size >= 4K keep one chunk only. Arenas of size 2K | |
657 | * may keep one chunk or multiple chunks. Here are the possible | |
658 | * layouts of arenas: | |
659 | * | |
660 | * # One chunk only, chunksize 2^k + SOMETHING - ALIGN, k >= 11 | |
661 | * | |
662 | * INDEX MAGIC1 UNUSED CHUNK1 | |
663 | * | |
664 | * # Multichunk with sanity checking and chunksize 2^k-ALIGN, k>7 | |
665 | * | |
666 | * INDEX MAGIC1 MAGIC2 MAGIC3 UNUSED CHUNK1 CHUNK2 CHUNK3 ... | |
667 | * | |
668 | * # Multichunk with sanity checking and size 2^k-ALIGN, k=7 | |
669 | * | |
670 | * INDEX MAGIC1 MAGIC2 MAGIC3 UNUSED CHUNK1 UNUSED CHUNK2 CHUNK3 ... | |
671 | * | |
672 | * # Multichunk with sanity checking and size up to 80 | |
673 | * | |
674 | * INDEX UNUSED MAGIC1 UNUSED MAGIC2 UNUSED ... CHUNK1 CHUNK2 CHUNK3 ... | |
675 | * | |
676 | * # No sanity check (usually up to 48=byte-long buckets) | |
677 | * INDEX UNUSED CHUNK1 CHUNK2 ... | |
678 | * | |
679 | * Above INDEX and MAGIC are one-byte-long. Sizes of UNUSED are | |
680 | * appropriate to keep algorithms simple and memory aligned. INDEX | |
681 | * encodes the size of the chunk, while MAGICn encodes state (used, | |
682 | * free or non-managed-by-us-so-it-indicates-a-bug) of CHUNKn. MAGIC | |
683 | * is used for sanity checking purposes only. SOMETHING is 0 or 4K | |
684 | * (to make size of big CHUNK accomodate allocations for powers of two | |
685 | * better). | |
686 | * | |
687 | * [There is no need to alignment between chunks, since C rules ensure | |
688 | * that structs which need 2^k alignment have sizeof which is | |
689 | * divisible by 2^k. Thus as far as the last chunk is aligned at the | |
690 | * end of the arena, and 2K-alignment does not contradict things, | |
691 | * everything is going to be OK for sizes of chunks 2^n and 2^n + | |
692 | * 2^k. Say, 80-bit buckets will be 16-bit aligned, and as far as we | |
693 | * put allocations for requests in 65..80 range, all is fine. | |
694 | * | |
695 | * Note, however, that standard malloc() puts more strict | |
696 | * requirements than the above C rules. Moreover, our algorithms of | |
697 | * realloc() may break this idyll, but we suppose that realloc() does | |
698 | * need not change alignment.] | |
699 | * | |
700 | * Is very important to make calculation of the offset of MAGICm as | |
701 | * quick as possible, since it is done on each malloc()/free(). In | |
702 | * fact it is so quick that it has quite little effect on the speed of | |
703 | * doing malloc()/free(). [By default] We forego such calculations | |
704 | * for small chunks, but only to save extra 3% of memory, not because | |
705 | * of speed considerations. | |
706 | * | |
707 | * Here is the algorithm [which is the same for all the allocations | |
708 | * schemes above], see OV_MAGIC(block,bucket). Let OFFSETm be the | |
709 | * offset of the CHUNKm from the start of ARENA. Then offset of | |
710 | * MAGICm is (OFFSET1 >> SHIFT) + ADDOFFSET. Here SHIFT and ADDOFFSET | |
711 | * are numbers which depend on the size of the chunks only. | |
712 | * | |
713 | * Let as check some sanity conditions. Numbers OFFSETm>>SHIFT are | |
714 | * different for all the chunks in the arena if 2^SHIFT is not greater | |
715 | * than size of the chunks in the arena. MAGIC1 will not overwrite | |
716 | * INDEX provided ADDOFFSET is >0 if OFFSET1 < 2^SHIFT. MAGIClast | |
717 | * will not overwrite CHUNK1 if OFFSET1 > (OFFSETlast >> SHIFT) + | |
718 | * ADDOFFSET. | |
719 | * | |
720 | * Make SHIFT the maximal possible (there is no point in making it | |
721 | * smaller). Since OFFSETlast is 2K - CHUNKSIZE, above restrictions | |
722 | * give restrictions on OFFSET1 and on ADDOFFSET. | |
723 | * | |
724 | * In particular, for chunks of size 2^k with k>=6 we can put | |
725 | * ADDOFFSET to be from 0 to 2^k - 2^(11-k), and have | |
726 | * OFFSET1==chunksize. For chunks of size 80 OFFSET1 of 2K%80=48 is | |
727 | * large enough to have ADDOFFSET between 1 and 16 (similarly for 96, | |
728 | * when ADDOFFSET should be 1). In particular, keeping MAGICs for | |
729 | * these sizes gives no additional size penalty. | |
730 | * | |
731 | * However, for chunks of size 2^k with k<=5 this gives OFFSET1 >= | |
732 | * ADDOFSET + 2^(11-k). Keeping ADDOFFSET 0 allows for 2^(11-k)-2^(11-2k) | |
733 | * chunks per arena. This is smaller than 2^(11-k) - 1 which are | |
734 | * needed if no MAGIC is kept. [In fact, having a negative ADDOFFSET | |
735 | * would allow for slightly more buckets per arena for k=2,3.] | |
736 | * | |
737 | * Similarly, for chunks of size 3/2*2^k with k<=5 MAGICs would span | |
738 | * the area up to 2^(11-k)+ADDOFFSET. For k=4 this give optimal | |
739 | * ADDOFFSET as -7..0. For k=3 ADDOFFSET can go up to 4 (with tiny | |
740 | * savings for negative ADDOFFSET). For k=5 ADDOFFSET can go -1..16 | |
741 | * (with no savings for negative values). | |
cf5c4ad8 | 742 | * |
4ad56ec9 IZ |
743 | * In particular, keeping ADDOFFSET 0 for sizes of chunks up to 2^6 |
744 | * leads to tiny pessimizations in case of sizes 4, 8, 12, 24, and | |
745 | * leads to no contradictions except for size=80 (or 96.) | |
cf5c4ad8 | 746 | * |
4ad56ec9 IZ |
747 | * However, it also makes sense to keep no magic for sizes 48 or less. |
748 | * This is what we do. In this case one needs ADDOFFSET>=1 also for | |
749 | * chunksizes 12, 24, and 48, unless one gets one less chunk per | |
750 | * arena. | |
751 | * | |
752 | * The algo of OV_MAGIC(block,bucket) keeps ADDOFFSET 0 until | |
753 | * chunksize of 64, then makes it 1. | |
cf5c4ad8 | 754 | * |
4ad56ec9 IZ |
755 | * This allows for an additional optimization: the above scheme leads |
756 | * to giant overheads for sizes 128 or more (one whole chunk needs to | |
757 | * be sacrifised to keep INDEX). Instead we use chunks not of size | |
758 | * 2^k, but of size 2^k-ALIGN. If we pack these chunks at the end of | |
759 | * the arena, then the beginnings are still in different 2^k-long | |
760 | * sections of the arena if k>=7 for ALIGN==4, and k>=8 if ALIGN=8. | |
761 | * Thus for k>7 the above algo of calculating the offset of the magic | |
762 | * will still give different answers for different chunks. And to | |
763 | * avoid the overrun of MAGIC1 into INDEX, one needs ADDOFFSET of >=1. | |
764 | * In the case k=7 we just move the first chunk an extra ALIGN | |
765 | * backward inside the ARENA (this is done once per arena lifetime, | |
766 | * thus is not a big overhead). */ | |
e8bc2b5c GS |
767 | # define MAX_PACKED_POW2 6 |
768 | # define MAX_PACKED (MAX_PACKED_POW2 * BUCKETS_PER_POW2 + BUCKET_POW2_SHIFT) | |
769 | # define MAX_POW2_ALGO ((1<<(MAX_PACKED_POW2 + 1)) - M_OVERHEAD) | |
770 | # define TWOK_MASK ((1<<LOG_OF_MIN_ARENA) - 1) | |
56431972 RB |
771 | # define TWOK_MASKED(x) (PTR2UV(x) & ~TWOK_MASK) |
772 | # define TWOK_SHIFT(x) (PTR2UV(x) & TWOK_MASK) | |
773 | # define OV_INDEXp(block) (INT2PTR(u_char*,TWOK_MASKED(block))) | |
cf5c4ad8 | 774 | # define OV_INDEX(block) (*OV_INDEXp(block)) |
775 | # define OV_MAGIC(block,bucket) (*(OV_INDEXp(block) + \ | |
e8bc2b5c GS |
776 | (TWOK_SHIFT(block)>> \ |
777 | (bucket>>BUCKET_POW2_SHIFT)) + \ | |
778 | (bucket >= MIN_NEEDS_SHIFT ? 1 : 0))) | |
779 | /* A bucket can have a shift smaller than it size, we need to | |
780 | shift its magic number so it will not overwrite index: */ | |
781 | # ifdef BUCKETS_ROOT2 | |
782 | # define MIN_NEEDS_SHIFT (7*BUCKETS_PER_POW2 - 1) /* Shift 80 greater than chunk 64. */ | |
783 | # else | |
784 | # define MIN_NEEDS_SHIFT (7*BUCKETS_PER_POW2) /* Shift 128 greater than chunk 32. */ | |
785 | # endif | |
cf5c4ad8 | 786 | # define CHUNK_SHIFT 0 |
787 | ||
e8bc2b5c GS |
788 | /* Number of active buckets of given ordinal. */ |
789 | #ifdef IGNORE_SMALL_BAD_FREE | |
790 | #define FIRST_BUCKET_WITH_CHECK (6 * BUCKETS_PER_POW2) /* 64 */ | |
791 | # define N_BLKS(bucket) ( (bucket) < FIRST_BUCKET_WITH_CHECK \ | |
d0bbed78 | 792 | ? ((1<<LOG_OF_MIN_ARENA) - 1)/BUCKET_SIZE_NO_SURPLUS(bucket) \ |
e8bc2b5c GS |
793 | : n_blks[bucket] ) |
794 | #else | |
795 | # define N_BLKS(bucket) n_blks[bucket] | |
796 | #endif | |
797 | ||
798 | static u_short n_blks[LOG_OF_MIN_ARENA * BUCKETS_PER_POW2] = | |
799 | { | |
800 | # if BUCKETS_PER_POW2==1 | |
801 | 0, 0, | |
802 | (MIN_BUC_POW2==2 ? 384 : 0), | |
803 | 224, 120, 62, 31, 16, 8, 4, 2 | |
804 | # else | |
805 | 0, 0, 0, 0, | |
806 | (MIN_BUC_POW2==2 ? 384 : 0), (MIN_BUC_POW2==2 ? 384 : 0), /* 4, 4 */ | |
807 | 224, 149, 120, 80, 62, 41, 31, 25, 16, 16, 8, 8, 4, 4, 2, 2 | |
808 | # endif | |
809 | }; | |
810 | ||
811 | /* Shift of the first bucket with the given ordinal inside 2K chunk. */ | |
812 | #ifdef IGNORE_SMALL_BAD_FREE | |
813 | # define BLK_SHIFT(bucket) ( (bucket) < FIRST_BUCKET_WITH_CHECK \ | |
814 | ? ((1<<LOG_OF_MIN_ARENA) \ | |
d0bbed78 | 815 | - BUCKET_SIZE_NO_SURPLUS(bucket) * N_BLKS(bucket)) \ |
e8bc2b5c GS |
816 | : blk_shift[bucket]) |
817 | #else | |
818 | # define BLK_SHIFT(bucket) blk_shift[bucket] | |
819 | #endif | |
820 | ||
821 | static u_short blk_shift[LOG_OF_MIN_ARENA * BUCKETS_PER_POW2] = | |
822 | { | |
823 | # if BUCKETS_PER_POW2==1 | |
824 | 0, 0, | |
825 | (MIN_BUC_POW2==2 ? 512 : 0), | |
826 | 256, 128, 64, 64, /* 8 to 64 */ | |
827 | 16*sizeof(union overhead), | |
828 | 8*sizeof(union overhead), | |
829 | 4*sizeof(union overhead), | |
830 | 2*sizeof(union overhead), | |
831 | # else | |
832 | 0, 0, 0, 0, | |
833 | (MIN_BUC_POW2==2 ? 512 : 0), (MIN_BUC_POW2==2 ? 512 : 0), | |
834 | 256, 260, 128, 128, 64, 80, 64, 48, /* 8 to 96 */ | |
835 | 16*sizeof(union overhead), 16*sizeof(union overhead), | |
836 | 8*sizeof(union overhead), 8*sizeof(union overhead), | |
837 | 4*sizeof(union overhead), 4*sizeof(union overhead), | |
838 | 2*sizeof(union overhead), 2*sizeof(union overhead), | |
839 | # endif | |
840 | }; | |
cf5c4ad8 | 841 | |
5bbd1ef5 IZ |
842 | # define NEEDED_ALIGNMENT 0x800 /* 2k boundaries */ |
843 | # define WANTED_ALIGNMENT 0x800 /* 2k boundaries */ | |
844 | ||
cf5c4ad8 | 845 | #else /* !PACK_MALLOC */ |
846 | ||
847 | # define OV_MAGIC(block,bucket) (block)->ov_magic | |
848 | # define OV_INDEX(block) (block)->ov_index | |
849 | # define CHUNK_SHIFT 1 | |
e8bc2b5c | 850 | # define MAX_PACKED -1 |
5bbd1ef5 IZ |
851 | # define NEEDED_ALIGNMENT MEM_ALIGNBYTES |
852 | # define WANTED_ALIGNMENT 0x400 /* 1k boundaries */ | |
853 | ||
cf5c4ad8 | 854 | #endif /* !PACK_MALLOC */ |
855 | ||
d0bbed78 | 856 | #define M_OVERHEAD (sizeof(union overhead) + RMAGIC_SZ) /* overhead at start+end */ |
e8bc2b5c GS |
857 | |
858 | #ifdef PACK_MALLOC | |
859 | # define MEM_OVERHEAD(bucket) \ | |
860 | (bucket <= MAX_PACKED ? 0 : M_OVERHEAD) | |
861 | # ifdef SMALL_BUCKET_VIA_TABLE | |
862 | # define START_SHIFTS_BUCKET ((MAX_PACKED_POW2 + 1) * BUCKETS_PER_POW2) | |
863 | # define START_SHIFT MAX_PACKED_POW2 | |
864 | # ifdef BUCKETS_ROOT2 /* Chunks of size 3*2^n. */ | |
865 | # define SIZE_TABLE_MAX 80 | |
866 | # else | |
867 | # define SIZE_TABLE_MAX 64 | |
868 | # endif | |
869 | static char bucket_of[] = | |
870 | { | |
871 | # ifdef BUCKETS_ROOT2 /* Chunks of size 3*2^n. */ | |
872 | /* 0 to 15 in 4-byte increments. */ | |
873 | (sizeof(void*) > 4 ? 6 : 5), /* 4/8, 5-th bucket for better reports */ | |
874 | 6, /* 8 */ | |
274c7500 | 875 | IF_ALIGN_8(8,7), 8, /* 16/12, 16 */ |
e8bc2b5c GS |
876 | 9, 9, 10, 10, /* 24, 32 */ |
877 | 11, 11, 11, 11, /* 48 */ | |
878 | 12, 12, 12, 12, /* 64 */ | |
879 | 13, 13, 13, 13, /* 80 */ | |
880 | 13, 13, 13, 13 /* 80 */ | |
881 | # else /* !BUCKETS_ROOT2 */ | |
882 | /* 0 to 15 in 4-byte increments. */ | |
883 | (sizeof(void*) > 4 ? 3 : 2), | |
884 | 3, | |
885 | 4, 4, | |
886 | 5, 5, 5, 5, | |
887 | 6, 6, 6, 6, | |
888 | 6, 6, 6, 6 | |
889 | # endif /* !BUCKETS_ROOT2 */ | |
890 | }; | |
891 | # else /* !SMALL_BUCKET_VIA_TABLE */ | |
892 | # define START_SHIFTS_BUCKET MIN_BUCKET | |
893 | # define START_SHIFT (MIN_BUC_POW2 - 1) | |
894 | # endif /* !SMALL_BUCKET_VIA_TABLE */ | |
895 | #else /* !PACK_MALLOC */ | |
896 | # define MEM_OVERHEAD(bucket) M_OVERHEAD | |
897 | # ifdef SMALL_BUCKET_VIA_TABLE | |
898 | # undef SMALL_BUCKET_VIA_TABLE | |
899 | # endif | |
900 | # define START_SHIFTS_BUCKET MIN_BUCKET | |
901 | # define START_SHIFT (MIN_BUC_POW2 - 1) | |
902 | #endif /* !PACK_MALLOC */ | |
cf5c4ad8 | 903 | |
8d063cd8 | 904 | /* |
55497cff | 905 | * Big allocations are often of the size 2^n bytes. To make them a |
906 | * little bit better, make blocks of size 2^n+pagesize for big n. | |
907 | */ | |
908 | ||
909 | #ifdef TWO_POT_OPTIMIZE | |
910 | ||
5f05dabc | 911 | # ifndef PERL_PAGESIZE |
912 | # define PERL_PAGESIZE 4096 | |
913 | # endif | |
e8bc2b5c GS |
914 | # ifndef FIRST_BIG_POW2 |
915 | # define FIRST_BIG_POW2 15 /* 32K, 16K is used too often. */ | |
5f05dabc | 916 | # endif |
e8bc2b5c | 917 | # define FIRST_BIG_BLOCK (1<<FIRST_BIG_POW2) |
55497cff | 918 | /* If this value or more, check against bigger blocks. */ |
919 | # define FIRST_BIG_BOUND (FIRST_BIG_BLOCK - M_OVERHEAD) | |
920 | /* If less than this value, goes into 2^n-overhead-block. */ | |
921 | # define LAST_SMALL_BOUND ((FIRST_BIG_BLOCK>>1) - M_OVERHEAD) | |
922 | ||
e8bc2b5c GS |
923 | # define POW2_OPTIMIZE_ADJUST(nbytes) \ |
924 | ((nbytes >= FIRST_BIG_BOUND) ? nbytes -= PERL_PAGESIZE : 0) | |
925 | # define POW2_OPTIMIZE_SURPLUS(bucket) \ | |
926 | ((bucket >= FIRST_BIG_POW2 * BUCKETS_PER_POW2) ? PERL_PAGESIZE : 0) | |
927 | ||
928 | #else /* !TWO_POT_OPTIMIZE */ | |
929 | # define POW2_OPTIMIZE_ADJUST(nbytes) | |
930 | # define POW2_OPTIMIZE_SURPLUS(bucket) 0 | |
931 | #endif /* !TWO_POT_OPTIMIZE */ | |
932 | ||
933 | #if defined(HAS_64K_LIMIT) && defined(PERL_CORE) | |
934 | # define BARK_64K_LIMIT(what,nbytes,size) \ | |
935 | if (nbytes > 0xffff) { \ | |
936 | PerlIO_printf(PerlIO_stderr(), \ | |
937 | "%s too large: %lx\n", what, size); \ | |
938 | my_exit(1); \ | |
939 | } | |
940 | #else /* !HAS_64K_LIMIT || !PERL_CORE */ | |
941 | # define BARK_64K_LIMIT(what,nbytes,size) | |
942 | #endif /* !HAS_64K_LIMIT || !PERL_CORE */ | |
55497cff | 943 | |
e8bc2b5c GS |
944 | #ifndef MIN_SBRK |
945 | # define MIN_SBRK 2048 | |
946 | #endif | |
947 | ||
948 | #ifndef FIRST_SBRK | |
d720c441 | 949 | # define FIRST_SBRK (48*1024) |
e8bc2b5c GS |
950 | #endif |
951 | ||
952 | /* Minimal sbrk in percents of what is already alloced. */ | |
953 | #ifndef MIN_SBRK_FRAC | |
954 | # define MIN_SBRK_FRAC 3 | |
955 | #endif | |
956 | ||
957 | #ifndef SBRK_ALLOW_FAILURES | |
958 | # define SBRK_ALLOW_FAILURES 3 | |
959 | #endif | |
55497cff | 960 | |
e8bc2b5c GS |
961 | #ifndef SBRK_FAILURE_PRICE |
962 | # define SBRK_FAILURE_PRICE 50 | |
55497cff | 963 | #endif |
964 | ||
24dd13bf JH |
965 | static void morecore (register int bucket); |
966 | # if defined(DEBUGGING) | |
066d1a89 | 967 | static void botch (char *diag, char *s, char *file, int line); |
24dd13bf JH |
968 | # endif |
969 | static void add_to_chain (void *p, MEM_SIZE size, MEM_SIZE chip); | |
970 | static void* get_from_chain (MEM_SIZE size); | |
971 | static void* get_from_bigger_buckets(int bucket, MEM_SIZE size); | |
972 | static union overhead *getpages (MEM_SIZE needed, int *nblksp, int bucket); | |
973 | static int getpages_adjacent(MEM_SIZE require); | |
974 | ||
febabd2a | 975 | #ifdef PERL_CORE |
e8bc2b5c | 976 | |
3541dd58 | 977 | #ifdef I_MACH_CTHREADS |
772fe5b3 HM |
978 | # undef MUTEX_LOCK |
979 | # define MUTEX_LOCK(m) STMT_START { if (*m) mutex_lock(*m); } STMT_END | |
980 | # undef MUTEX_UNLOCK | |
981 | # define MUTEX_UNLOCK(m) STMT_START { if (*m) mutex_unlock(*m); } STMT_END | |
3541dd58 HM |
982 | #endif |
983 | ||
22f7c9c9 JH |
984 | #endif /* defined PERL_CORE */ |
985 | ||
986 | #ifndef PTRSIZE | |
987 | # define PTRSIZE sizeof(void*) | |
988 | #endif | |
989 | ||
b022d2d2 IZ |
990 | #ifndef BITS_IN_PTR |
991 | # define BITS_IN_PTR (8*PTRSIZE) | |
992 | #endif | |
993 | ||
994 | /* | |
995 | * nextf[i] is the pointer to the next free block of size 2^i. The | |
996 | * smallest allocatable block is 8 bytes. The overhead information | |
997 | * precedes the data area returned to the user. | |
998 | */ | |
999 | #define NBUCKETS (BITS_IN_PTR*BUCKETS_PER_POW2 + 1) | |
1000 | static union overhead *nextf[NBUCKETS]; | |
1001 | ||
1002 | #if defined(PURIFY) && !defined(USE_PERL_SBRK) | |
1003 | # define USE_PERL_SBRK | |
1004 | #endif | |
1005 | ||
1006 | #ifdef USE_PERL_SBRK | |
3f270f98 | 1007 | # define sbrk(a) Perl_sbrk(a) |
b022d2d2 | 1008 | Malloc_t Perl_sbrk (int size); |
b022d2d2 | 1009 | #else |
3f270f98 | 1010 | # ifndef HAS_SBRK_PROTO /* <unistd.h> usually takes care of this */ |
b022d2d2 | 1011 | extern Malloc_t sbrk(int); |
3f270f98 | 1012 | # endif |
ef9f17be | 1013 | #endif |
b022d2d2 | 1014 | |
22f7c9c9 JH |
1015 | #ifndef MIN_SBRK_FRAC1000 /* Backward compatibility */ |
1016 | # define MIN_SBRK_FRAC1000 (MIN_SBRK_FRAC * 10) | |
1017 | #endif | |
1018 | ||
1019 | #ifndef START_EXTERN_C | |
1020 | # ifdef __cplusplus | |
1021 | # define START_EXTERN_C extern "C" { | |
1022 | # else | |
1023 | # define START_EXTERN_C | |
1024 | # endif | |
1025 | #endif | |
1026 | ||
1027 | #ifndef END_EXTERN_C | |
1028 | # ifdef __cplusplus | |
1029 | # define END_EXTERN_C }; | |
1030 | # else | |
1031 | # define END_EXTERN_C | |
1032 | # endif | |
1033 | #endif | |
1034 | ||
1035 | #include "malloc_ctl.h" | |
1036 | ||
1037 | #ifndef NO_MALLOC_DYNAMIC_CFG | |
1038 | # define PERL_MALLOC_OPT_CHARS "FMfAPGdac" | |
1039 | ||
41ad8e42 JH |
1040 | # ifndef FILL_DEAD_DEFAULT |
1041 | # define FILL_DEAD_DEFAULT 1 | |
1042 | # endif | |
1043 | # ifndef FILL_ALIVE_DEFAULT | |
1044 | # define FILL_ALIVE_DEFAULT 1 | |
1045 | # endif | |
1046 | # ifndef FILL_CHECK_DEFAULT | |
1047 | # define FILL_CHECK_DEFAULT 1 | |
1048 | # endif | |
1049 | ||
22f7c9c9 JH |
1050 | static IV MallocCfg[MallocCfg_last] = { |
1051 | FIRST_SBRK, | |
1052 | MIN_SBRK, | |
1053 | MIN_SBRK_FRAC, | |
1054 | SBRK_ALLOW_FAILURES, | |
1055 | SBRK_FAILURE_PRICE, | |
1056 | SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE, /* sbrk_goodness */ | |
41ad8e42 JH |
1057 | FILL_DEAD_DEFAULT, /* FILL_DEAD */ |
1058 | FILL_ALIVE_DEFAULT, /* FILL_ALIVE */ | |
1059 | FILL_CHECK_DEFAULT, /* FILL_CHECK */ | |
22f7c9c9 JH |
1060 | 0, /* MallocCfg_skip_cfg_env */ |
1061 | 0, /* MallocCfg_cfg_env_read */ | |
1062 | 0, /* MallocCfg_emergency_buffer_size */ | |
1063 | 0, /* MallocCfg_emergency_buffer_prepared_size */ | |
1064 | 0 /* MallocCfg_emergency_buffer_last_req */ | |
1065 | }; | |
1066 | IV *MallocCfg_ptr = MallocCfg; | |
1067 | ||
1068 | # undef MIN_SBRK | |
1069 | # undef FIRST_SBRK | |
1070 | # undef MIN_SBRK_FRAC1000 | |
1071 | # undef SBRK_ALLOW_FAILURES | |
1072 | # undef SBRK_FAILURE_PRICE | |
1073 | ||
1074 | # define MIN_SBRK MallocCfg[MallocCfg_MIN_SBRK] | |
1075 | # define FIRST_SBRK MallocCfg[MallocCfg_FIRST_SBRK] | |
1076 | # define MIN_SBRK_FRAC1000 MallocCfg[MallocCfg_MIN_SBRK_FRAC1000] | |
1077 | # define SBRK_ALLOW_FAILURES MallocCfg[MallocCfg_SBRK_ALLOW_FAILURES] | |
1078 | # define SBRK_FAILURE_PRICE MallocCfg[MallocCfg_SBRK_FAILURE_PRICE] | |
1079 | ||
1080 | # define sbrk_goodness MallocCfg[MallocCfg_sbrk_goodness] | |
1081 | ||
1082 | # define emergency_buffer_size MallocCfg[MallocCfg_emergency_buffer_size] | |
1083 | # define emergency_buffer_last_req MallocCfg[MallocCfg_emergency_buffer_last_req] | |
1084 | ||
1085 | # define FILL_DEAD MallocCfg[MallocCfg_filldead] | |
1086 | # define FILL_ALIVE MallocCfg[MallocCfg_fillalive] | |
1087 | # define FILL_CHECK_CFG MallocCfg[MallocCfg_fillcheck] | |
1088 | # define FILL_CHECK (FILL_DEAD && FILL_CHECK_CFG) | |
1089 | ||
1090 | #else /* defined(NO_MALLOC_DYNAMIC_CFG) */ | |
1091 | ||
1092 | # define FILL_DEAD 1 | |
1093 | # define FILL_ALIVE 1 | |
1094 | # define FILL_CHECK 1 | |
1095 | static int sbrk_goodness = SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE; | |
1096 | ||
1097 | # define NO_PERL_MALLOC_ENV | |
1098 | ||
1099 | #endif | |
1100 | ||
b022d2d2 IZ |
1101 | #ifdef DEBUGGING_MSTATS |
1102 | /* | |
1103 | * nmalloc[i] is the difference between the number of mallocs and frees | |
1104 | * for a given block size. | |
1105 | */ | |
1106 | static u_int nmalloc[NBUCKETS]; | |
1107 | static u_int sbrk_slack; | |
1108 | static u_int start_slack; | |
1109 | #else /* !( defined DEBUGGING_MSTATS ) */ | |
1110 | # define sbrk_slack 0 | |
1111 | #endif | |
1112 | ||
1113 | static u_int goodsbrk; | |
1114 | ||
22f7c9c9 | 1115 | #ifdef PERL_EMERGENCY_SBRK |
febabd2a DD |
1116 | |
1117 | # ifndef BIG_SIZE | |
1118 | # define BIG_SIZE (1<<16) /* 64K */ | |
1119 | # endif | |
1120 | ||
55497cff | 1121 | static char *emergency_buffer; |
22f7c9c9 JH |
1122 | static char *emergency_buffer_prepared; |
1123 | ||
1124 | # ifdef NO_MALLOC_DYNAMIC_CFG | |
55497cff | 1125 | static MEM_SIZE emergency_buffer_size; |
22f7c9c9 JH |
1126 | /* 0 if the last request for more memory succeeded. |
1127 | Otherwise the size of the failing request. */ | |
1128 | static MEM_SIZE emergency_buffer_last_req; | |
1129 | # endif | |
1130 | ||
1131 | # ifndef emergency_sbrk_croak | |
1132 | # define emergency_sbrk_croak croak2 | |
1133 | # endif | |
1134 | ||
1135 | # ifdef PERL_CORE | |
1136 | static char * | |
1137 | perl_get_emergency_buffer(IV *size) | |
1138 | { | |
1139 | dTHX; | |
1140 | /* First offense, give a possibility to recover by dieing. */ | |
1141 | /* No malloc involved here: */ | |
1142 | GV **gvp = (GV**)hv_fetch(PL_defstash, "^M", 2, 0); | |
1143 | SV *sv; | |
1144 | char *pv; | |
1145 | STRLEN n_a; | |
1146 | ||
1147 | if (!gvp) gvp = (GV**)hv_fetch(PL_defstash, "\015", 1, 0); | |
1148 | if (!gvp || !(sv = GvSV(*gvp)) || !SvPOK(sv) | |
1149 | || (SvLEN(sv) < (1<<LOG_OF_MIN_ARENA) - M_OVERHEAD)) | |
1150 | return NULL; /* Now die die die... */ | |
1151 | /* Got it, now detach SvPV: */ | |
1152 | pv = SvPV(sv, n_a); | |
1153 | /* Check alignment: */ | |
1154 | if ((PTR2UV(pv) - sizeof(union overhead)) & (NEEDED_ALIGNMENT - 1)) { | |
1155 | PerlIO_puts(PerlIO_stderr(),"Bad alignment of $^M!\n"); | |
1156 | return NULL; /* die die die */ | |
1157 | } | |
1158 | ||
1159 | SvPOK_off(sv); | |
1160 | SvPVX(sv) = Nullch; | |
1161 | SvCUR(sv) = SvLEN(sv) = 0; | |
1162 | *size = malloced_size(pv) + M_OVERHEAD; | |
1163 | return pv - sizeof(union overhead); | |
1164 | } | |
1165 | # define PERL_GET_EMERGENCY_BUFFER(p) perl_get_emergency_buffer(p) | |
1166 | # else | |
1167 | # define PERL_GET_EMERGENCY_BUFFER(p) NULL | |
1168 | # endif /* defined PERL_CORE */ | |
1169 | ||
1170 | # ifndef NO_MALLOC_DYNAMIC_CFG | |
1171 | static char * | |
1172 | get_emergency_buffer(IV *size) | |
1173 | { | |
1174 | char *pv = emergency_buffer_prepared; | |
1175 | ||
1176 | *size = MallocCfg[MallocCfg_emergency_buffer_prepared_size]; | |
1177 | emergency_buffer_prepared = 0; | |
1178 | MallocCfg[MallocCfg_emergency_buffer_prepared_size] = 0; | |
1179 | return pv; | |
1180 | } | |
1181 | ||
1182 | /* Returns 0 on success, -1 on bad alignment, -2 if not implemented */ | |
1183 | int | |
1184 | set_emergency_buffer(char *b, IV size) | |
1185 | { | |
1186 | if (PTR2UV(b) & (NEEDED_ALIGNMENT - 1)) | |
1187 | return -1; | |
1188 | if (MallocCfg[MallocCfg_emergency_buffer_prepared_size]) | |
1189 | add_to_chain((void*)emergency_buffer_prepared, | |
1190 | MallocCfg[MallocCfg_emergency_buffer_prepared_size], 0); | |
1191 | emergency_buffer_prepared = b; | |
1192 | MallocCfg[MallocCfg_emergency_buffer_prepared_size] = size; | |
1193 | return 0; | |
1194 | } | |
1195 | # define GET_EMERGENCY_BUFFER(p) get_emergency_buffer(p) | |
1196 | # else /* NO_MALLOC_DYNAMIC_CFG */ | |
1197 | # define GET_EMERGENCY_BUFFER(p) NULL | |
1198 | int | |
1199 | set_emergency_buffer(char *b, IV size) | |
1200 | { | |
1201 | return -1; | |
1202 | } | |
1203 | # endif | |
55497cff | 1204 | |
cea2e8a9 GS |
1205 | static Malloc_t |
1206 | emergency_sbrk(MEM_SIZE size) | |
55497cff | 1207 | { |
28ac10b1 IZ |
1208 | MEM_SIZE rsize = (((size - 1)>>LOG_OF_MIN_ARENA) + 1)<<LOG_OF_MIN_ARENA; |
1209 | ||
22f7c9c9 JH |
1210 | if (size >= BIG_SIZE |
1211 | && (!emergency_buffer_last_req || (size < emergency_buffer_last_req))) { | |
b022d2d2 | 1212 | /* Give the possibility to recover, but avoid an infinite cycle. */ |
741df71a | 1213 | MALLOC_UNLOCK; |
22f7c9c9 JH |
1214 | emergency_buffer_last_req = size; |
1215 | emergency_sbrk_croak("Out of memory during \"large\" request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack)); | |
55497cff | 1216 | } |
1217 | ||
28ac10b1 IZ |
1218 | if (emergency_buffer_size >= rsize) { |
1219 | char *old = emergency_buffer; | |
1220 | ||
1221 | emergency_buffer_size -= rsize; | |
1222 | emergency_buffer += rsize; | |
1223 | return old; | |
1224 | } else { | |
55497cff | 1225 | /* First offense, give a possibility to recover by dieing. */ |
1226 | /* No malloc involved here: */ | |
22f7c9c9 JH |
1227 | IV Size; |
1228 | char *pv = GET_EMERGENCY_BUFFER(&Size); | |
28ac10b1 | 1229 | int have = 0; |
55497cff | 1230 | |
28ac10b1 IZ |
1231 | if (emergency_buffer_size) { |
1232 | add_to_chain(emergency_buffer, emergency_buffer_size, 0); | |
1233 | emergency_buffer_size = 0; | |
1234 | emergency_buffer = Nullch; | |
1235 | have = 1; | |
1236 | } | |
22f7c9c9 JH |
1237 | |
1238 | if (!pv) | |
1239 | pv = PERL_GET_EMERGENCY_BUFFER(&Size); | |
1240 | if (!pv) { | |
28ac10b1 IZ |
1241 | if (have) |
1242 | goto do_croak; | |
55497cff | 1243 | return (char *)-1; /* Now die die die... */ |
28ac10b1 | 1244 | } |
22f7c9c9 | 1245 | |
55497cff | 1246 | /* Check alignment: */ |
22f7c9c9 JH |
1247 | if (PTR2UV(pv) & (NEEDED_ALIGNMENT - 1)) { |
1248 | dTHX; | |
1249 | ||
55497cff | 1250 | PerlIO_puts(PerlIO_stderr(),"Bad alignment of $^M!\n"); |
bbce6d69 | 1251 | return (char *)-1; /* die die die */ |
55497cff | 1252 | } |
1253 | ||
22f7c9c9 JH |
1254 | emergency_buffer = pv; |
1255 | emergency_buffer_size = Size; | |
55497cff | 1256 | } |
28ac10b1 | 1257 | do_croak: |
741df71a | 1258 | MALLOC_UNLOCK; |
22f7c9c9 | 1259 | emergency_sbrk_croak("Out of memory during request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack)); |
ce70748c GS |
1260 | /* NOTREACHED */ |
1261 | return Nullch; | |
55497cff | 1262 | } |
1263 | ||
22f7c9c9 | 1264 | #else /* !defined(PERL_EMERGENCY_SBRK) */ |
55497cff | 1265 | # define emergency_sbrk(size) -1 |
22f7c9c9 JH |
1266 | #endif /* defined PERL_EMERGENCY_SBRK */ |
1267 | ||
1268 | static void | |
1269 | write2(char *mess) | |
1270 | { | |
1271 | write(2, mess, strlen(mess)); | |
1272 | } | |
55497cff | 1273 | |
760ac839 | 1274 | #ifdef DEBUGGING |
3541dd58 | 1275 | #undef ASSERT |
066d1a89 | 1276 | #define ASSERT(p,diag) if (!(p)) botch(diag,STRINGIFY(p),__FILE__,__LINE__); else |
cea2e8a9 | 1277 | static void |
066d1a89 | 1278 | botch(char *diag, char *s, char *file, int line) |
8d063cd8 | 1279 | { |
22f7c9c9 JH |
1280 | if (!(PERL_MAYBE_ALIVE && PERL_GET_THX)) |
1281 | goto do_write; | |
1282 | else { | |
e8cd8248 | 1283 | dTHX; |
22f7c9c9 | 1284 | if (PerlIO_printf(PerlIO_stderr(), |
066d1a89 JH |
1285 | "assertion botched (%s?): %s%s %s:%d\n", |
1286 | diag, s, file, line) != 0) { | |
22f7c9c9 JH |
1287 | do_write: /* Can be initializing interpreter */ |
1288 | write2("assertion botched ("); | |
1289 | write2(diag); | |
1290 | write2("?): "); | |
1291 | write2(s); | |
066d1a89 JH |
1292 | write2(" ("); |
1293 | write2(file); | |
1294 | write2(":"); | |
6bf964e1 JH |
1295 | { |
1296 | char linebuf[10]; | |
1297 | char *s = linebuf + sizeof(linebuf) - 1; | |
1298 | int n = line; | |
1299 | *s = 0; | |
1300 | do { | |
1301 | *--s = '0' + (n % 10); | |
1302 | } while (n /= 10); | |
1303 | write2(s); | |
1304 | } | |
066d1a89 | 1305 | write2(")\n"); |
22f7c9c9 | 1306 | } |
3028581b | 1307 | PerlProc_abort(); |
22f7c9c9 | 1308 | } |
8d063cd8 LW |
1309 | } |
1310 | #else | |
3541dd58 | 1311 | #define ASSERT(p, diag) |
8d063cd8 LW |
1312 | #endif |
1313 | ||
22f7c9c9 JH |
1314 | #ifdef MALLOC_FILL |
1315 | /* Fill should be long enough to cover long */ | |
1316 | static void | |
1317 | fill_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) | |
1318 | { | |
1319 | unsigned char *e = s + nbytes; | |
1320 | long *lp; | |
1321 | long lfill = *(long*)fill; | |
1322 | ||
1323 | if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ | |
1324 | int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); | |
1325 | unsigned const char *f = fill + sizeof(long) - shift; | |
1326 | unsigned char *e1 = s + shift; | |
1327 | ||
1328 | while (s < e1) | |
1329 | *s++ = *f++; | |
1330 | } | |
1331 | lp = (long*)s; | |
1332 | while ((unsigned char*)(lp + 1) <= e) | |
1333 | *lp++ = lfill; | |
1334 | s = (unsigned char*)lp; | |
1335 | while (s < e) | |
1336 | *s++ = *fill++; | |
1337 | } | |
1338 | /* Just malloc()ed */ | |
1339 | static const unsigned char fill_feedadad[] = | |
1340 | {0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD, | |
1341 | 0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD}; | |
1342 | /* Just free()ed */ | |
1343 | static const unsigned char fill_deadbeef[] = | |
1344 | {0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF, | |
1345 | 0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF}; | |
1346 | # define FILL_DEADBEEF(s, n) \ | |
1347 | (void)(FILL_DEAD? (fill_pat_4bytes((s), (n), fill_deadbeef), 0) : 0) | |
1348 | # define FILL_FEEDADAD(s, n) \ | |
1349 | (void)(FILL_ALIVE? (fill_pat_4bytes((s), (n), fill_feedadad), 0) : 0) | |
1350 | #else | |
1351 | # define FILL_DEADBEEF(s, n) ((void)0) | |
1352 | # define FILL_FEEDADAD(s, n) ((void)0) | |
1353 | # undef MALLOC_FILL_CHECK | |
1354 | #endif | |
1355 | ||
1356 | #ifdef MALLOC_FILL_CHECK | |
1357 | static int | |
1358 | cmp_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) | |
1359 | { | |
1360 | unsigned char *e = s + nbytes; | |
1361 | long *lp; | |
1362 | long lfill = *(long*)fill; | |
1363 | ||
1364 | if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ | |
1365 | int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); | |
1366 | unsigned const char *f = fill + sizeof(long) - shift; | |
1367 | unsigned char *e1 = s + shift; | |
1368 | ||
1369 | while (s < e1) | |
1370 | if (*s++ != *f++) | |
1371 | return 1; | |
1372 | } | |
1373 | lp = (long*)s; | |
1374 | while ((unsigned char*)(lp + 1) <= e) | |
1375 | if (*lp++ != lfill) | |
1376 | return 1; | |
1377 | s = (unsigned char*)lp; | |
1378 | while (s < e) | |
1379 | if (*s++ != *fill++) | |
1380 | return 1; | |
1381 | return 0; | |
1382 | } | |
1383 | # define FILLCHECK_DEADBEEF(s, n) \ | |
1384 | ASSERT(!FILL_CHECK || !cmp_pat_4bytes(s, n, fill_deadbeef), \ | |
1385 | "free()ed/realloc()ed-away memory was overwritten") | |
1386 | #else | |
1387 | # define FILLCHECK_DEADBEEF(s, n) ((void)0) | |
1388 | #endif | |
1389 | ||
2304df62 | 1390 | Malloc_t |
86058a2d | 1391 | Perl_malloc(register size_t nbytes) |
8d063cd8 LW |
1392 | { |
1393 | register union overhead *p; | |
e8bc2b5c | 1394 | register int bucket; |
ee0007ab | 1395 | register MEM_SIZE shiftr; |
8d063cd8 | 1396 | |
c2a5c2d2 | 1397 | #if defined(DEBUGGING) || defined(RCHECK) |
ee0007ab | 1398 | MEM_SIZE size = nbytes; |
45d8adaa LW |
1399 | #endif |
1400 | ||
e8bc2b5c | 1401 | BARK_64K_LIMIT("Allocation",nbytes,nbytes); |
45d8adaa LW |
1402 | #ifdef DEBUGGING |
1403 | if ((long)nbytes < 0) | |
cea2e8a9 | 1404 | croak("%s", "panic: malloc"); |
45d8adaa | 1405 | #endif |
45d8adaa | 1406 | |
8d063cd8 LW |
1407 | /* |
1408 | * Convert amount of memory requested into | |
1409 | * closest block size stored in hash buckets | |
1410 | * which satisfies request. Account for | |
1411 | * space used per block for accounting. | |
1412 | */ | |
cf5c4ad8 | 1413 | #ifdef PACK_MALLOC |
e8bc2b5c GS |
1414 | # ifdef SMALL_BUCKET_VIA_TABLE |
1415 | if (nbytes == 0) | |
1416 | bucket = MIN_BUCKET; | |
1417 | else if (nbytes <= SIZE_TABLE_MAX) { | |
1418 | bucket = bucket_of[(nbytes - 1) >> BUCKET_TABLE_SHIFT]; | |
1419 | } else | |
1420 | # else | |
043bf814 RB |
1421 | if (nbytes == 0) |
1422 | nbytes = 1; | |
e8bc2b5c GS |
1423 | if (nbytes <= MAX_POW2_ALGO) goto do_shifts; |
1424 | else | |
1425 | # endif | |
55497cff | 1426 | #endif |
e8bc2b5c GS |
1427 | { |
1428 | POW2_OPTIMIZE_ADJUST(nbytes); | |
1429 | nbytes += M_OVERHEAD; | |
1430 | nbytes = (nbytes + 3) &~ 3; | |
516a5887 | 1431 | #if defined(PACK_MALLOC) && !defined(SMALL_BUCKET_VIA_TABLE) |
e8bc2b5c | 1432 | do_shifts: |
516a5887 | 1433 | #endif |
e8bc2b5c GS |
1434 | shiftr = (nbytes - 1) >> START_SHIFT; |
1435 | bucket = START_SHIFTS_BUCKET; | |
1436 | /* apart from this loop, this is O(1) */ | |
1437 | while (shiftr >>= 1) | |
1438 | bucket += BUCKETS_PER_POW2; | |
cf5c4ad8 | 1439 | } |
4ad56ec9 | 1440 | MALLOC_LOCK; |
8d063cd8 LW |
1441 | /* |
1442 | * If nothing in hash bucket right now, | |
1443 | * request more memory from the system. | |
1444 | */ | |
1445 | if (nextf[bucket] == NULL) | |
1446 | morecore(bucket); | |
e8bc2b5c | 1447 | if ((p = nextf[bucket]) == NULL) { |
741df71a | 1448 | MALLOC_UNLOCK; |
55497cff | 1449 | #ifdef PERL_CORE |
0b250b9e GS |
1450 | { |
1451 | dTHX; | |
1452 | if (!PL_nomemok) { | |
febabd2a DD |
1453 | #if defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) |
1454 | PerlIO_puts(PerlIO_stderr(),"Out of memory!\n"); | |
1455 | #else | |
b022d2d2 IZ |
1456 | char buff[80]; |
1457 | char *eb = buff + sizeof(buff) - 1; | |
1458 | char *s = eb; | |
1459 | size_t n = nbytes; | |
1460 | ||
1461 | PerlIO_puts(PerlIO_stderr(),"Out of memory during request for "); | |
1462 | #if defined(DEBUGGING) || defined(RCHECK) | |
1463 | n = size; | |
1464 | #endif | |
1465 | *s = 0; | |
1466 | do { | |
1467 | *--s = '0' + (n % 10); | |
1468 | } while (n /= 10); | |
1469 | PerlIO_puts(PerlIO_stderr(),s); | |
1470 | PerlIO_puts(PerlIO_stderr()," bytes, total sbrk() is "); | |
1471 | s = eb; | |
1472 | n = goodsbrk + sbrk_slack; | |
1473 | do { | |
1474 | *--s = '0' + (n % 10); | |
1475 | } while (n /= 10); | |
1476 | PerlIO_puts(PerlIO_stderr(),s); | |
1477 | PerlIO_puts(PerlIO_stderr()," bytes!\n"); | |
febabd2a | 1478 | #endif /* defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) */ |
0b250b9e GS |
1479 | my_exit(1); |
1480 | } | |
ee0007ab | 1481 | } |
45d8adaa | 1482 | #endif |
4ad56ec9 | 1483 | return (NULL); |
45d8adaa LW |
1484 | } |
1485 | ||
8d063cd8 | 1486 | /* remove from linked list */ |
22f7c9c9 JH |
1487 | #ifdef DEBUGGING |
1488 | if ( (PTR2UV(p) & (MEM_ALIGNBYTES - 1)) | |
1489 | /* Can't get this low */ | |
1490 | || (p && PTR2UV(p) < (1<<LOG_OF_MIN_ARENA)) ) { | |
e8cd8248 | 1491 | dTHX; |
b900a521 | 1492 | PerlIO_printf(PerlIO_stderr(), |
7fa2f4f1 GS |
1493 | "Unaligned pointer in the free chain 0x%"UVxf"\n", |
1494 | PTR2UV(p)); | |
1495 | } | |
22f7c9c9 JH |
1496 | if ( (PTR2UV(p->ov_next) & (MEM_ALIGNBYTES - 1)) |
1497 | || (p->ov_next && PTR2UV(p->ov_next) < (1<<LOG_OF_MIN_ARENA)) ) { | |
e8cd8248 | 1498 | dTHX; |
7fa2f4f1 GS |
1499 | PerlIO_printf(PerlIO_stderr(), |
1500 | "Unaligned `next' pointer in the free " | |
d2560b70 | 1501 | "chain 0x%"UVxf" at 0x%"UVxf"\n", |
7fa2f4f1 | 1502 | PTR2UV(p->ov_next), PTR2UV(p)); |
32e30700 | 1503 | } |
bf38876a LW |
1504 | #endif |
1505 | nextf[bucket] = p->ov_next; | |
4ad56ec9 IZ |
1506 | |
1507 | MALLOC_UNLOCK; | |
1508 | ||
51a5ed28 HS |
1509 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
1510 | "0x%"UVxf": (%05lu) malloc %ld bytes\n", | |
253fdc3f | 1511 | PTR2UV((Malloc_t)(p + CHUNK_SHIFT)), (unsigned long)(PL_an++), |
51a5ed28 HS |
1512 | (long)size)); |
1513 | ||
22f7c9c9 | 1514 | FILLCHECK_DEADBEEF((unsigned char*)(p + CHUNK_SHIFT), |
d0bbed78 | 1515 | BUCKET_SIZE_REAL(bucket) + RMAGIC_SZ); |
22f7c9c9 | 1516 | |
e8bc2b5c GS |
1517 | #ifdef IGNORE_SMALL_BAD_FREE |
1518 | if (bucket >= FIRST_BUCKET_WITH_CHECK) | |
1519 | #endif | |
1520 | OV_MAGIC(p, bucket) = MAGIC; | |
cf5c4ad8 | 1521 | #ifndef PACK_MALLOC |
1522 | OV_INDEX(p) = bucket; | |
1523 | #endif | |
8d063cd8 LW |
1524 | #ifdef RCHECK |
1525 | /* | |
1526 | * Record allocated size of block and | |
1527 | * bound space with magic numbers. | |
1528 | */ | |
8d063cd8 | 1529 | p->ov_rmagic = RMAGIC; |
e8bc2b5c GS |
1530 | if (bucket <= MAX_SHORT_BUCKET) { |
1531 | int i; | |
1532 | ||
1533 | nbytes = size + M_OVERHEAD; | |
1534 | p->ov_size = nbytes - 1; | |
d0bbed78 IZ |
1535 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
1536 | i = RMAGIC_SZ - i; | |
1537 | while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ | |
1538 | ((caddr_t)p + nbytes - RMAGIC_SZ)[i] = RMAGIC_C; | |
e8bc2b5c | 1539 | } |
d0bbed78 IZ |
1540 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
1541 | nbytes = (nbytes + RMAGIC_SZ - 1) & ~(RMAGIC_SZ - 1); | |
1542 | ((u_int *)((caddr_t)p + nbytes))[-1] = RMAGIC; | |
e8bc2b5c | 1543 | } |
22f7c9c9 | 1544 | FILL_FEEDADAD((unsigned char *)(p + CHUNK_SHIFT), size); |
8d063cd8 | 1545 | #endif |
cf5c4ad8 | 1546 | return ((Malloc_t)(p + CHUNK_SHIFT)); |
8d063cd8 LW |
1547 | } |
1548 | ||
e8bc2b5c GS |
1549 | static char *last_sbrk_top; |
1550 | static char *last_op; /* This arena can be easily extended. */ | |
6e21dc91 | 1551 | static MEM_SIZE sbrked_remains; |
e8bc2b5c GS |
1552 | |
1553 | #ifdef DEBUGGING_MSTATS | |
1554 | static int sbrks; | |
1555 | #endif | |
1556 | ||
1557 | struct chunk_chain_s { | |
1558 | struct chunk_chain_s *next; | |
1559 | MEM_SIZE size; | |
1560 | }; | |
1561 | static struct chunk_chain_s *chunk_chain; | |
1562 | static int n_chunks; | |
1563 | static char max_bucket; | |
1564 | ||
1565 | /* Cutoff a piece of one of the chunks in the chain. Prefer smaller chunk. */ | |
cea2e8a9 GS |
1566 | static void * |
1567 | get_from_chain(MEM_SIZE size) | |
e8bc2b5c GS |
1568 | { |
1569 | struct chunk_chain_s *elt = chunk_chain, **oldp = &chunk_chain; | |
1570 | struct chunk_chain_s **oldgoodp = NULL; | |
1571 | long min_remain = LONG_MAX; | |
1572 | ||
1573 | while (elt) { | |
1574 | if (elt->size >= size) { | |
1575 | long remains = elt->size - size; | |
1576 | if (remains >= 0 && remains < min_remain) { | |
1577 | oldgoodp = oldp; | |
1578 | min_remain = remains; | |
1579 | } | |
1580 | if (remains == 0) { | |
1581 | break; | |
1582 | } | |
1583 | } | |
1584 | oldp = &( elt->next ); | |
1585 | elt = elt->next; | |
1586 | } | |
1587 | if (!oldgoodp) return NULL; | |
1588 | if (min_remain) { | |
1589 | void *ret = *oldgoodp; | |
1590 | struct chunk_chain_s *next = (*oldgoodp)->next; | |
1591 | ||
1592 | *oldgoodp = (struct chunk_chain_s *)((char*)ret + size); | |
1593 | (*oldgoodp)->size = min_remain; | |
1594 | (*oldgoodp)->next = next; | |
1595 | return ret; | |
1596 | } else { | |
1597 | void *ret = *oldgoodp; | |
1598 | *oldgoodp = (*oldgoodp)->next; | |
1599 | n_chunks--; | |
1600 | return ret; | |
1601 | } | |
1602 | } | |
1603 | ||
cea2e8a9 GS |
1604 | static void |
1605 | add_to_chain(void *p, MEM_SIZE size, MEM_SIZE chip) | |
e8bc2b5c GS |
1606 | { |
1607 | struct chunk_chain_s *next = chunk_chain; | |
1608 | char *cp = (char*)p; | |
1609 | ||
1610 | cp += chip; | |
1611 | chunk_chain = (struct chunk_chain_s *)cp; | |
1612 | chunk_chain->size = size - chip; | |
1613 | chunk_chain->next = next; | |
1614 | n_chunks++; | |
1615 | } | |
1616 | ||
cea2e8a9 GS |
1617 | static void * |
1618 | get_from_bigger_buckets(int bucket, MEM_SIZE size) | |
e8bc2b5c GS |
1619 | { |
1620 | int price = 1; | |
1621 | static int bucketprice[NBUCKETS]; | |
1622 | while (bucket <= max_bucket) { | |
1623 | /* We postpone stealing from bigger buckets until we want it | |
1624 | often enough. */ | |
1625 | if (nextf[bucket] && bucketprice[bucket]++ >= price) { | |
1626 | /* Steal it! */ | |
1627 | void *ret = (void*)(nextf[bucket] - 1 + CHUNK_SHIFT); | |
1628 | bucketprice[bucket] = 0; | |
1629 | if (((char*)nextf[bucket]) - M_OVERHEAD == last_op) { | |
1630 | last_op = NULL; /* Disable optimization */ | |
1631 | } | |
1632 | nextf[bucket] = nextf[bucket]->ov_next; | |
1633 | #ifdef DEBUGGING_MSTATS | |
1634 | nmalloc[bucket]--; | |
1635 | start_slack -= M_OVERHEAD; | |
1636 | #endif | |
d0bbed78 | 1637 | add_to_chain(ret, (BUCKET_SIZE_NO_SURPLUS(bucket) + |
e8bc2b5c GS |
1638 | POW2_OPTIMIZE_SURPLUS(bucket)), |
1639 | size); | |
1640 | return ret; | |
1641 | } | |
1642 | bucket++; | |
1643 | } | |
1644 | return NULL; | |
1645 | } | |
1646 | ||
cea2e8a9 | 1647 | static union overhead * |
c7374474 | 1648 | getpages(MEM_SIZE needed, int *nblksp, int bucket) |
fa423c5b IZ |
1649 | { |
1650 | /* Need to do (possibly expensive) system call. Try to | |
1651 | optimize it for rare calling. */ | |
1652 | MEM_SIZE require = needed - sbrked_remains; | |
1653 | char *cp; | |
1654 | union overhead *ovp; | |
c7374474 | 1655 | MEM_SIZE slack = 0; |
fa423c5b | 1656 | |
22f7c9c9 | 1657 | if (sbrk_goodness > 0) { |
fa423c5b IZ |
1658 | if (!last_sbrk_top && require < FIRST_SBRK) |
1659 | require = FIRST_SBRK; | |
1660 | else if (require < MIN_SBRK) require = MIN_SBRK; | |
1661 | ||
22f7c9c9 JH |
1662 | if (require < goodsbrk * MIN_SBRK_FRAC1000 / 1000) |
1663 | require = goodsbrk * MIN_SBRK_FRAC1000 / 1000; | |
fa423c5b IZ |
1664 | require = ((require - 1 + MIN_SBRK) / MIN_SBRK) * MIN_SBRK; |
1665 | } else { | |
1666 | require = needed; | |
1667 | last_sbrk_top = 0; | |
1668 | sbrked_remains = 0; | |
1669 | } | |
1670 | ||
1671 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1672 | "sbrk(%ld) for %ld-byte-long arena\n", | |
1673 | (long)require, (long) needed)); | |
1674 | cp = (char *)sbrk(require); | |
1675 | #ifdef DEBUGGING_MSTATS | |
1676 | sbrks++; | |
1677 | #endif | |
1678 | if (cp == last_sbrk_top) { | |
1679 | /* Common case, anything is fine. */ | |
22f7c9c9 | 1680 | sbrk_goodness++; |
fa423c5b | 1681 | ovp = (union overhead *) (cp - sbrked_remains); |
e9397286 | 1682 | last_op = cp - sbrked_remains; |
fa423c5b IZ |
1683 | sbrked_remains = require - (needed - sbrked_remains); |
1684 | } else if (cp == (char *)-1) { /* no more room! */ | |
1685 | ovp = (union overhead *)emergency_sbrk(needed); | |
1686 | if (ovp == (union overhead *)-1) | |
1687 | return 0; | |
e9397286 GS |
1688 | if (((char*)ovp) > last_op) { /* Cannot happen with current emergency_sbrk() */ |
1689 | last_op = 0; | |
1690 | } | |
fa423c5b IZ |
1691 | return ovp; |
1692 | } else { /* Non-continuous or first sbrk(). */ | |
1693 | long add = sbrked_remains; | |
1694 | char *newcp; | |
1695 | ||
1696 | if (sbrked_remains) { /* Put rest into chain, we | |
1697 | cannot use it right now. */ | |
1698 | add_to_chain((void*)(last_sbrk_top - sbrked_remains), | |
1699 | sbrked_remains, 0); | |
1700 | } | |
1701 | ||
1702 | /* Second, check alignment. */ | |
1703 | slack = 0; | |
1704 | ||
61ae2fbf | 1705 | #if !defined(atarist) && !defined(__MINT__) /* on the atari we dont have to worry about this */ |
fa423c5b | 1706 | # ifndef I286 /* The sbrk(0) call on the I286 always returns the next segment */ |
5bbd1ef5 IZ |
1707 | /* WANTED_ALIGNMENT may be more than NEEDED_ALIGNMENT, but this may |
1708 | improve performance of memory access. */ | |
56431972 RB |
1709 | if (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)) { /* Not aligned. */ |
1710 | slack = WANTED_ALIGNMENT - (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)); | |
fa423c5b IZ |
1711 | add += slack; |
1712 | } | |
1713 | # endif | |
61ae2fbf | 1714 | #endif /* !atarist && !MINT */ |
fa423c5b IZ |
1715 | |
1716 | if (add) { | |
1717 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1718 | "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", | |
1719 | (long)add, (long) slack, | |
1720 | (long) sbrked_remains)); | |
1721 | newcp = (char *)sbrk(add); | |
1722 | #if defined(DEBUGGING_MSTATS) | |
1723 | sbrks++; | |
1724 | sbrk_slack += add; | |
1725 | #endif | |
1726 | if (newcp != cp + require) { | |
1727 | /* Too bad: even rounding sbrk() is not continuous.*/ | |
1728 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1729 | "failed to fix bad sbrk()\n")); | |
1730 | #ifdef PACK_MALLOC | |
1731 | if (slack) { | |
741df71a | 1732 | MALLOC_UNLOCK; |
5bbd1ef5 | 1733 | fatalcroak("panic: Off-page sbrk\n"); |
fa423c5b IZ |
1734 | } |
1735 | #endif | |
1736 | if (sbrked_remains) { | |
1737 | /* Try again. */ | |
1738 | #if defined(DEBUGGING_MSTATS) | |
1739 | sbrk_slack += require; | |
1740 | #endif | |
1741 | require = needed; | |
1742 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1743 | "straight sbrk(%ld)\n", | |
1744 | (long)require)); | |
1745 | cp = (char *)sbrk(require); | |
1746 | #ifdef DEBUGGING_MSTATS | |
1747 | sbrks++; | |
1748 | #endif | |
1749 | if (cp == (char *)-1) | |
1750 | return 0; | |
1751 | } | |
22f7c9c9 | 1752 | sbrk_goodness = -1; /* Disable optimization! |
fa423c5b IZ |
1753 | Continue with not-aligned... */ |
1754 | } else { | |
1755 | cp += slack; | |
1756 | require += sbrked_remains; | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | if (last_sbrk_top) { | |
22f7c9c9 | 1761 | sbrk_goodness -= SBRK_FAILURE_PRICE; |
fa423c5b IZ |
1762 | } |
1763 | ||
1764 | ovp = (union overhead *) cp; | |
1765 | /* | |
1766 | * Round up to minimum allocation size boundary | |
1767 | * and deduct from block count to reflect. | |
1768 | */ | |
1769 | ||
5bbd1ef5 | 1770 | # if NEEDED_ALIGNMENT > MEM_ALIGNBYTES |
56431972 | 1771 | if (PTR2UV(ovp) & (NEEDED_ALIGNMENT - 1)) |
5bbd1ef5 IZ |
1772 | fatalcroak("Misalignment of sbrk()\n"); |
1773 | else | |
1774 | # endif | |
fa423c5b | 1775 | #ifndef I286 /* Again, this should always be ok on an 80286 */ |
56431972 | 1776 | if (PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)) { |
fa423c5b IZ |
1777 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
1778 | "fixing sbrk(): %d bytes off machine alignement\n", | |
56431972 RB |
1779 | (int)(PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)))); |
1780 | ovp = INT2PTR(union overhead *,(PTR2UV(ovp) + MEM_ALIGNBYTES) & | |
5bbd1ef5 | 1781 | (MEM_ALIGNBYTES - 1)); |
fa423c5b IZ |
1782 | (*nblksp)--; |
1783 | # if defined(DEBUGGING_MSTATS) | |
1784 | /* This is only approx. if TWO_POT_OPTIMIZE: */ | |
5bbd1ef5 | 1785 | sbrk_slack += (1 << (bucket >> BUCKET_POW2_SHIFT)); |
fa423c5b IZ |
1786 | # endif |
1787 | } | |
1788 | #endif | |
5bbd1ef5 | 1789 | ; /* Finish `else' */ |
fa423c5b | 1790 | sbrked_remains = require - needed; |
e9397286 | 1791 | last_op = cp; |
fa423c5b | 1792 | } |
febabd2a | 1793 | #if !defined(PLAIN_MALLOC) && !defined(NO_FANCY_MALLOC) |
22f7c9c9 | 1794 | emergency_buffer_last_req = 0; |
febabd2a | 1795 | #endif |
fa423c5b | 1796 | last_sbrk_top = cp + require; |
fa423c5b IZ |
1797 | #ifdef DEBUGGING_MSTATS |
1798 | goodsbrk += require; | |
1799 | #endif | |
1800 | return ovp; | |
1801 | } | |
1802 | ||
cea2e8a9 | 1803 | static int |
c7374474 | 1804 | getpages_adjacent(MEM_SIZE require) |
fa423c5b IZ |
1805 | { |
1806 | if (require <= sbrked_remains) { | |
1807 | sbrked_remains -= require; | |
1808 | } else { | |
1809 | char *cp; | |
1810 | ||
1811 | require -= sbrked_remains; | |
1812 | /* We do not try to optimize sbrks here, we go for place. */ | |
1813 | cp = (char*) sbrk(require); | |
1814 | #ifdef DEBUGGING_MSTATS | |
1815 | sbrks++; | |
1816 | goodsbrk += require; | |
1817 | #endif | |
1818 | if (cp == last_sbrk_top) { | |
1819 | sbrked_remains = 0; | |
1820 | last_sbrk_top = cp + require; | |
1821 | } else { | |
28ac10b1 IZ |
1822 | if (cp == (char*)-1) { /* Out of memory */ |
1823 | #ifdef DEBUGGING_MSTATS | |
1824 | goodsbrk -= require; | |
1825 | #endif | |
1826 | return 0; | |
1827 | } | |
fa423c5b IZ |
1828 | /* Report the failure: */ |
1829 | if (sbrked_remains) | |
1830 | add_to_chain((void*)(last_sbrk_top - sbrked_remains), | |
1831 | sbrked_remains, 0); | |
1832 | add_to_chain((void*)cp, require, 0); | |
22f7c9c9 | 1833 | sbrk_goodness -= SBRK_FAILURE_PRICE; |
fa423c5b IZ |
1834 | sbrked_remains = 0; |
1835 | last_sbrk_top = 0; | |
1836 | last_op = 0; | |
1837 | return 0; | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | return 1; | |
1842 | } | |
1843 | ||
8d063cd8 LW |
1844 | /* |
1845 | * Allocate more memory to the indicated bucket. | |
1846 | */ | |
cea2e8a9 GS |
1847 | static void |
1848 | morecore(register int bucket) | |
8d063cd8 | 1849 | { |
72aaf631 | 1850 | register union overhead *ovp; |
8d063cd8 | 1851 | register int rnu; /* 2^rnu bytes will be requested */ |
fa423c5b | 1852 | int nblks; /* become nblks blocks of the desired size */ |
bbce6d69 | 1853 | register MEM_SIZE siz, needed; |
22f7c9c9 | 1854 | static int were_called = 0; |
8d063cd8 LW |
1855 | |
1856 | if (nextf[bucket]) | |
1857 | return; | |
22f7c9c9 JH |
1858 | #ifndef NO_PERL_MALLOC_ENV |
1859 | if (!were_called) { | |
1860 | /* It's the our first time. Initialize ourselves */ | |
1861 | were_called = 1; /* Avoid a loop */ | |
1862 | if (!MallocCfg[MallocCfg_skip_cfg_env]) { | |
1863 | char *s = getenv("PERL_MALLOC_OPT"), *t = s, *off; | |
1864 | const char *opts = PERL_MALLOC_OPT_CHARS; | |
1865 | int changed = 0; | |
1866 | ||
1867 | while ( t && t[0] && t[1] == '=' | |
1868 | && ((off = strchr(opts, *t))) ) { | |
1869 | IV val = 0; | |
1870 | ||
1871 | t += 2; | |
1872 | while (*t <= '9' && *t >= '0') | |
1873 | val = 10*val + *t++ - '0'; | |
1874 | if (!*t || *t == ';') { | |
1875 | if (MallocCfg[off - opts] != val) | |
1876 | changed = 1; | |
1877 | MallocCfg[off - opts] = val; | |
1878 | if (*t) | |
1879 | t++; | |
1880 | } | |
1881 | } | |
1882 | if (t && *t) { | |
1883 | write2("Unrecognized part of PERL_MALLOC_OPT: `"); | |
1884 | write2(t); | |
1885 | write2("'\n"); | |
1886 | } | |
1887 | if (changed) | |
1888 | MallocCfg[MallocCfg_cfg_env_read] = 1; | |
1889 | } | |
1890 | } | |
1891 | #endif | |
e8bc2b5c | 1892 | if (bucket == sizeof(MEM_SIZE)*8*BUCKETS_PER_POW2) { |
741df71a | 1893 | MALLOC_UNLOCK; |
d720c441 | 1894 | croak("%s", "Out of memory during ridiculously large request"); |
55497cff | 1895 | } |
d720c441 | 1896 | if (bucket > max_bucket) |
e8bc2b5c | 1897 | max_bucket = bucket; |
d720c441 | 1898 | |
e8bc2b5c GS |
1899 | rnu = ( (bucket <= (LOG_OF_MIN_ARENA << BUCKET_POW2_SHIFT)) |
1900 | ? LOG_OF_MIN_ARENA | |
1901 | : (bucket >> BUCKET_POW2_SHIFT) ); | |
1902 | /* This may be overwritten later: */ | |
1903 | nblks = 1 << (rnu - (bucket >> BUCKET_POW2_SHIFT)); /* how many blocks to get */ | |
1904 | needed = ((MEM_SIZE)1 << rnu) + POW2_OPTIMIZE_SURPLUS(bucket); | |
1905 | if (nextf[rnu << BUCKET_POW2_SHIFT]) { /* 2048b bucket. */ | |
1906 | ovp = nextf[rnu << BUCKET_POW2_SHIFT] - 1 + CHUNK_SHIFT; | |
1907 | nextf[rnu << BUCKET_POW2_SHIFT] | |
1908 | = nextf[rnu << BUCKET_POW2_SHIFT]->ov_next; | |
1909 | #ifdef DEBUGGING_MSTATS | |
1910 | nmalloc[rnu << BUCKET_POW2_SHIFT]--; | |
1911 | start_slack -= M_OVERHEAD; | |
1912 | #endif | |
1913 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1914 | "stealing %ld bytes from %ld arena\n", | |
1915 | (long) needed, (long) rnu << BUCKET_POW2_SHIFT)); | |
1916 | } else if (chunk_chain | |
1917 | && (ovp = (union overhead*) get_from_chain(needed))) { | |
1918 | DEBUG_m(PerlIO_printf(Perl_debug_log, | |
1919 | "stealing %ld bytes from chain\n", | |
1920 | (long) needed)); | |
d720c441 IZ |
1921 | } else if ( (ovp = (union overhead*) |
1922 | get_from_bigger_buckets((rnu << BUCKET_POW2_SHIFT) + 1, | |
1923 | needed)) ) { | |
e8bc2b5c GS |
1924 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
1925 | "stealing %ld bytes from bigger buckets\n", | |
1926 | (long) needed)); | |
1927 | } else if (needed <= sbrked_remains) { | |
1928 | ovp = (union overhead *)(last_sbrk_top - sbrked_remains); | |
1929 | sbrked_remains -= needed; | |
1930 | last_op = (char*)ovp; | |
fa423c5b IZ |
1931 | } else |
1932 | ovp = getpages(needed, &nblks, bucket); | |
e8bc2b5c | 1933 | |
fa423c5b IZ |
1934 | if (!ovp) |
1935 | return; | |
22f7c9c9 | 1936 | FILL_DEADBEEF((unsigned char*)ovp, needed); |
e8bc2b5c | 1937 | |
8d063cd8 LW |
1938 | /* |
1939 | * Add new memory allocated to that on | |
1940 | * free list for this hash bucket. | |
1941 | */ | |
d0bbed78 | 1942 | siz = BUCKET_SIZE_NO_SURPLUS(bucket); /* No surplus if nblks > 1 */ |
cf5c4ad8 | 1943 | #ifdef PACK_MALLOC |
72aaf631 | 1944 | *(u_char*)ovp = bucket; /* Fill index. */ |
e8bc2b5c GS |
1945 | if (bucket <= MAX_PACKED) { |
1946 | ovp = (union overhead *) ((char*)ovp + BLK_SHIFT(bucket)); | |
1947 | nblks = N_BLKS(bucket); | |
cf5c4ad8 | 1948 | # ifdef DEBUGGING_MSTATS |
e8bc2b5c | 1949 | start_slack += BLK_SHIFT(bucket); |
cf5c4ad8 | 1950 | # endif |
e8bc2b5c GS |
1951 | } else if (bucket < LOG_OF_MIN_ARENA * BUCKETS_PER_POW2) { |
1952 | ovp = (union overhead *) ((char*)ovp + BLK_SHIFT(bucket)); | |
cf5c4ad8 | 1953 | siz -= sizeof(union overhead); |
72aaf631 | 1954 | } else ovp++; /* One chunk per block. */ |
e8bc2b5c | 1955 | #endif /* PACK_MALLOC */ |
72aaf631 | 1956 | nextf[bucket] = ovp; |
5f05dabc | 1957 | #ifdef DEBUGGING_MSTATS |
1958 | nmalloc[bucket] += nblks; | |
e8bc2b5c GS |
1959 | if (bucket > MAX_PACKED) { |
1960 | start_slack += M_OVERHEAD * nblks; | |
1961 | } | |
5f05dabc | 1962 | #endif |
22f7c9c9 | 1963 | |
8d063cd8 | 1964 | while (--nblks > 0) { |
72aaf631 MB |
1965 | ovp->ov_next = (union overhead *)((caddr_t)ovp + siz); |
1966 | ovp = (union overhead *)((caddr_t)ovp + siz); | |
8d063cd8 | 1967 | } |
8595d6f1 | 1968 | /* Not all sbrks return zeroed memory.*/ |
72aaf631 | 1969 | ovp->ov_next = (union overhead *)NULL; |
cf5c4ad8 | 1970 | #ifdef PACK_MALLOC |
e8bc2b5c GS |
1971 | if (bucket == 7*BUCKETS_PER_POW2) { /* Special case, explanation is above. */ |
1972 | union overhead *n_op = nextf[7*BUCKETS_PER_POW2]->ov_next; | |
1973 | nextf[7*BUCKETS_PER_POW2] = | |
1974 | (union overhead *)((caddr_t)nextf[7*BUCKETS_PER_POW2] | |
1975 | - sizeof(union overhead)); | |
1976 | nextf[7*BUCKETS_PER_POW2]->ov_next = n_op; | |
cf5c4ad8 | 1977 | } |
1978 | #endif /* !PACK_MALLOC */ | |
8d063cd8 LW |
1979 | } |
1980 | ||
94b6baf5 | 1981 | Free_t |
86058a2d | 1982 | Perl_mfree(void *mp) |
cea2e8a9 | 1983 | { |
ee0007ab | 1984 | register MEM_SIZE size; |
72aaf631 | 1985 | register union overhead *ovp; |
352d5a3a | 1986 | char *cp = (char*)mp; |
cf5c4ad8 | 1987 | #ifdef PACK_MALLOC |
1988 | u_char bucket; | |
1989 | #endif | |
8d063cd8 | 1990 | |
e8bc2b5c | 1991 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
1992 | "0x%"UVxf": (%05lu) free\n", |
1993 | PTR2UV(cp), (unsigned long)(PL_an++))); | |
45d8adaa | 1994 | |
cf5c4ad8 | 1995 | if (cp == NULL) |
1996 | return; | |
22f7c9c9 JH |
1997 | #ifdef DEBUGGING |
1998 | if (PTR2UV(cp) & (MEM_ALIGNBYTES - 1)) | |
1999 | croak("%s", "wrong alignment in free()"); | |
2000 | #endif | |
72aaf631 | 2001 | ovp = (union overhead *)((caddr_t)cp |
e8bc2b5c | 2002 | - sizeof (union overhead) * CHUNK_SHIFT); |
cf5c4ad8 | 2003 | #ifdef PACK_MALLOC |
72aaf631 | 2004 | bucket = OV_INDEX(ovp); |
cf5c4ad8 | 2005 | #endif |
e8bc2b5c GS |
2006 | #ifdef IGNORE_SMALL_BAD_FREE |
2007 | if ((bucket >= FIRST_BUCKET_WITH_CHECK) | |
2008 | && (OV_MAGIC(ovp, bucket) != MAGIC)) | |
2009 | #else | |
2010 | if (OV_MAGIC(ovp, bucket) != MAGIC) | |
2011 | #endif | |
2012 | { | |
68dc0745 | 2013 | static int bad_free_warn = -1; |
cf5c4ad8 | 2014 | if (bad_free_warn == -1) { |
e8cd8248 | 2015 | dTHX; |
5fd9e9a4 | 2016 | char *pbf = PerlEnv_getenv("PERL_BADFREE"); |
cf5c4ad8 | 2017 | bad_free_warn = (pbf) ? atoi(pbf) : 1; |
2018 | } | |
2019 | if (!bad_free_warn) | |
2020 | return; | |
8990e307 | 2021 | #ifdef RCHECK |
2ba999ec | 2022 | #ifdef PERL_CORE |
e8cd8248 GS |
2023 | { |
2024 | dTHX; | |
2025 | if (!PERL_IS_ALIVE || !PL_curcop || ckWARN_d(WARN_MALLOC)) | |
9014280d | 2026 | Perl_warner(aTHX_ packWARN(WARN_MALLOC), "%s free() ignored (RMAGIC, PERL_CORE)", |
e8cd8248 GS |
2027 | ovp->ov_rmagic == RMAGIC - 1 ? |
2028 | "Duplicate" : "Bad"); | |
2ba999ec | 2029 | } |
e476b1b5 | 2030 | #else |
52c6645e | 2031 | warn("%s free() ignored (RMAGIC)", |
2ba999ec | 2032 | ovp->ov_rmagic == RMAGIC - 1 ? "Duplicate" : "Bad"); |
e476b1b5 GS |
2033 | #endif |
2034 | #else | |
2035 | #ifdef PERL_CORE | |
2ba999ec GS |
2036 | { |
2037 | dTHX; | |
1d860e85 | 2038 | if (!PERL_IS_ALIVE || !PL_curcop || ckWARN_d(WARN_MALLOC)) |
9014280d | 2039 | Perl_warner(aTHX_ packWARN(WARN_MALLOC), "%s", "Bad free() ignored (PERL_CORE)"); |
2ba999ec | 2040 | } |
8990e307 | 2041 | #else |
2ba999ec | 2042 | warn("%s", "Bad free() ignored"); |
8990e307 | 2043 | #endif |
e476b1b5 | 2044 | #endif |
8d063cd8 | 2045 | return; /* sanity */ |
e8bc2b5c | 2046 | } |
8d063cd8 | 2047 | #ifdef RCHECK |
3541dd58 | 2048 | ASSERT(ovp->ov_rmagic == RMAGIC, "chunk's head overwrite"); |
e8bc2b5c GS |
2049 | if (OV_INDEX(ovp) <= MAX_SHORT_BUCKET) { |
2050 | int i; | |
2051 | MEM_SIZE nbytes = ovp->ov_size + 1; | |
2052 | ||
d0bbed78 IZ |
2053 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
2054 | i = RMAGIC_SZ - i; | |
2055 | while (i--) { /* nbytes - RMAGIC_SZ is end of alloced area */ | |
2056 | ASSERT(((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] == RMAGIC_C, | |
2057 | "chunk's tail overwrite"); | |
e8bc2b5c GS |
2058 | } |
2059 | } | |
d0bbed78 IZ |
2060 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2061 | nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); | |
2062 | ASSERT(((u_int *)((caddr_t)ovp + nbytes))[-1] == RMAGIC, | |
2063 | "chunk's tail overwrite"); | |
2064 | FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nbytes), | |
2065 | BUCKET_SIZE(OV_INDEX(ovp)) - nbytes); | |
e8bc2b5c | 2066 | } |
d0bbed78 IZ |
2067 | FILL_DEADBEEF((unsigned char*)(ovp+CHUNK_SHIFT), |
2068 | BUCKET_SIZE_REAL(OV_INDEX(ovp)) + RMAGIC_SZ); | |
72aaf631 | 2069 | ovp->ov_rmagic = RMAGIC - 1; |
8d063cd8 | 2070 | #endif |
3541dd58 | 2071 | ASSERT(OV_INDEX(ovp) < NBUCKETS, "chunk's head overwrite"); |
72aaf631 | 2072 | size = OV_INDEX(ovp); |
4ad56ec9 IZ |
2073 | |
2074 | MALLOC_LOCK; | |
72aaf631 MB |
2075 | ovp->ov_next = nextf[size]; |
2076 | nextf[size] = ovp; | |
741df71a | 2077 | MALLOC_UNLOCK; |
8d063cd8 LW |
2078 | } |
2079 | ||
4ad56ec9 IZ |
2080 | /* There is no need to do any locking in realloc (with an exception of |
2081 | trying to grow in place if we are at the end of the chain). | |
2082 | If somebody calls us from a different thread with the same address, | |
2083 | we are sole anyway. */ | |
8d063cd8 | 2084 | |
2304df62 | 2085 | Malloc_t |
86058a2d | 2086 | Perl_realloc(void *mp, size_t nbytes) |
cea2e8a9 | 2087 | { |
ee0007ab | 2088 | register MEM_SIZE onb; |
72aaf631 | 2089 | union overhead *ovp; |
d720c441 IZ |
2090 | char *res; |
2091 | int prev_bucket; | |
e8bc2b5c | 2092 | register int bucket; |
4ad56ec9 IZ |
2093 | int incr; /* 1 if does not fit, -1 if "easily" fits in a |
2094 | smaller bucket, otherwise 0. */ | |
352d5a3a | 2095 | char *cp = (char*)mp; |
8d063cd8 | 2096 | |
e8bc2b5c | 2097 | #if defined(DEBUGGING) || !defined(PERL_CORE) |
ee0007ab | 2098 | MEM_SIZE size = nbytes; |
45d8adaa | 2099 | |
45d8adaa | 2100 | if ((long)nbytes < 0) |
cea2e8a9 | 2101 | croak("%s", "panic: realloc"); |
45d8adaa | 2102 | #endif |
e8bc2b5c GS |
2103 | |
2104 | BARK_64K_LIMIT("Reallocation",nbytes,size); | |
2105 | if (!cp) | |
86058a2d | 2106 | return Perl_malloc(nbytes); |
45d8adaa | 2107 | |
72aaf631 | 2108 | ovp = (union overhead *)((caddr_t)cp |
e8bc2b5c GS |
2109 | - sizeof (union overhead) * CHUNK_SHIFT); |
2110 | bucket = OV_INDEX(ovp); | |
4ad56ec9 | 2111 | |
e8bc2b5c | 2112 | #ifdef IGNORE_SMALL_BAD_FREE |
4ad56ec9 IZ |
2113 | if ((bucket >= FIRST_BUCKET_WITH_CHECK) |
2114 | && (OV_MAGIC(ovp, bucket) != MAGIC)) | |
e8bc2b5c | 2115 | #else |
4ad56ec9 | 2116 | if (OV_MAGIC(ovp, bucket) != MAGIC) |
e8bc2b5c | 2117 | #endif |
4ad56ec9 IZ |
2118 | { |
2119 | static int bad_free_warn = -1; | |
2120 | if (bad_free_warn == -1) { | |
e8cd8248 | 2121 | dTHX; |
4ad56ec9 IZ |
2122 | char *pbf = PerlEnv_getenv("PERL_BADFREE"); |
2123 | bad_free_warn = (pbf) ? atoi(pbf) : 1; | |
2124 | } | |
2125 | if (!bad_free_warn) | |
ce70748c | 2126 | return Nullch; |
4ad56ec9 | 2127 | #ifdef RCHECK |
2ba999ec | 2128 | #ifdef PERL_CORE |
e8cd8248 GS |
2129 | { |
2130 | dTHX; | |
2131 | if (!PERL_IS_ALIVE || !PL_curcop || ckWARN_d(WARN_MALLOC)) | |
9014280d | 2132 | Perl_warner(aTHX_ packWARN(WARN_MALLOC), "%srealloc() %signored", |
e8cd8248 GS |
2133 | (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), |
2134 | ovp->ov_rmagic == RMAGIC - 1 | |
2135 | ? "of freed memory " : ""); | |
2ba999ec | 2136 | } |
e476b1b5 | 2137 | #else |
22f7c9c9 JH |
2138 | warn2("%srealloc() %signored", |
2139 | (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), | |
2140 | ovp->ov_rmagic == RMAGIC - 1 ? "of freed memory " : ""); | |
e476b1b5 GS |
2141 | #endif |
2142 | #else | |
2143 | #ifdef PERL_CORE | |
2ba999ec GS |
2144 | { |
2145 | dTHX; | |
1d860e85 | 2146 | if (!PERL_IS_ALIVE || !PL_curcop || ckWARN_d(WARN_MALLOC)) |
9014280d | 2147 | Perl_warner(aTHX_ packWARN(WARN_MALLOC), "%s", |
1d860e85 | 2148 | "Bad realloc() ignored"); |
2ba999ec | 2149 | } |
4ad56ec9 | 2150 | #else |
2ba999ec | 2151 | warn("%s", "Bad realloc() ignored"); |
4ad56ec9 | 2152 | #endif |
e476b1b5 | 2153 | #endif |
ce70748c | 2154 | return Nullch; /* sanity */ |
4ad56ec9 IZ |
2155 | } |
2156 | ||
e8bc2b5c | 2157 | onb = BUCKET_SIZE_REAL(bucket); |
55497cff | 2158 | /* |
2159 | * avoid the copy if same size block. | |
e8bc2b5c GS |
2160 | * We are not agressive with boundary cases. Note that it might |
2161 | * (for a small number of cases) give false negative if | |
55497cff | 2162 | * both new size and old one are in the bucket for |
e8bc2b5c GS |
2163 | * FIRST_BIG_POW2, but the new one is near the lower end. |
2164 | * | |
2165 | * We do not try to go to 1.5 times smaller bucket so far. | |
55497cff | 2166 | */ |
e8bc2b5c GS |
2167 | if (nbytes > onb) incr = 1; |
2168 | else { | |
2169 | #ifdef DO_NOT_TRY_HARDER_WHEN_SHRINKING | |
2170 | if ( /* This is a little bit pessimal if PACK_MALLOC: */ | |
2171 | nbytes > ( (onb >> 1) - M_OVERHEAD ) | |
2172 | # ifdef TWO_POT_OPTIMIZE | |
2173 | || (bucket == FIRST_BIG_POW2 && nbytes >= LAST_SMALL_BOUND ) | |
2174 | # endif | |
2175 | ) | |
2176 | #else /* !DO_NOT_TRY_HARDER_WHEN_SHRINKING */ | |
2177 | prev_bucket = ( (bucket > MAX_PACKED + 1) | |
2178 | ? bucket - BUCKETS_PER_POW2 | |
2179 | : bucket - 1); | |
2180 | if (nbytes > BUCKET_SIZE_REAL(prev_bucket)) | |
2181 | #endif /* !DO_NOT_TRY_HARDER_WHEN_SHRINKING */ | |
2182 | incr = 0; | |
2183 | else incr = -1; | |
2184 | } | |
2ce36478 | 2185 | #ifdef STRESS_REALLOC |
4ad56ec9 | 2186 | goto hard_way; |
2ce36478 | 2187 | #endif |
4ad56ec9 | 2188 | if (incr == 0) { |
852c2e52 | 2189 | inplace_label: |
a687059c LW |
2190 | #ifdef RCHECK |
2191 | /* | |
2192 | * Record new allocated size of block and | |
2193 | * bound space with magic numbers. | |
2194 | */ | |
72aaf631 | 2195 | if (OV_INDEX(ovp) <= MAX_SHORT_BUCKET) { |
e8bc2b5c GS |
2196 | int i, nb = ovp->ov_size + 1; |
2197 | ||
d0bbed78 IZ |
2198 | if ((i = nb & (RMAGIC_SZ-1))) { |
2199 | i = RMAGIC_SZ - i; | |
2200 | while (i--) { /* nb - RMAGIC_SZ is end of alloced area */ | |
2201 | ASSERT(((caddr_t)ovp + nb - RMAGIC_SZ)[i] == RMAGIC_C, "chunk's tail overwrite"); | |
e8bc2b5c GS |
2202 | } |
2203 | } | |
d0bbed78 IZ |
2204 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2205 | nb = (nb + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); | |
2206 | ASSERT(((u_int *)((caddr_t)ovp + nb))[-1] == RMAGIC, | |
2207 | "chunk's tail overwrite"); | |
2208 | FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nb), | |
2209 | BUCKET_SIZE(OV_INDEX(ovp)) - nb); | |
22f7c9c9 JH |
2210 | if (nbytes > ovp->ov_size + 1 - M_OVERHEAD) |
2211 | FILL_FEEDADAD((unsigned char*)cp + ovp->ov_size + 1 - M_OVERHEAD, | |
2212 | nbytes - (ovp->ov_size + 1 - M_OVERHEAD)); | |
2213 | else | |
2214 | FILL_DEADBEEF((unsigned char*)cp + nbytes, | |
d0bbed78 | 2215 | nb - M_OVERHEAD + RMAGIC_SZ - nbytes); |
a687059c LW |
2216 | /* |
2217 | * Convert amount of memory requested into | |
2218 | * closest block size stored in hash buckets | |
2219 | * which satisfies request. Account for | |
2220 | * space used per block for accounting. | |
2221 | */ | |
cf5c4ad8 | 2222 | nbytes += M_OVERHEAD; |
72aaf631 | 2223 | ovp->ov_size = nbytes - 1; |
d0bbed78 IZ |
2224 | if ((i = nbytes & (RMAGIC_SZ-1))) { |
2225 | i = RMAGIC_SZ - i; | |
2226 | while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ | |
2227 | ((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] | |
e8bc2b5c GS |
2228 | = RMAGIC_C; |
2229 | } | |
d0bbed78 IZ |
2230 | /* Same at RMAGIC_SZ-aligned RMAGIC */ |
2231 | nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ - 1); | |
2232 | ((u_int *)((caddr_t)ovp + nbytes))[-1] = RMAGIC; | |
a687059c LW |
2233 | } |
2234 | #endif | |
45d8adaa | 2235 | res = cp; |
42ac124e | 2236 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
2237 | "0x%"UVxf": (%05lu) realloc %ld bytes inplace\n", |
2238 | PTR2UV(res),(unsigned long)(PL_an++), | |
42ac124e | 2239 | (long)size)); |
e8bc2b5c GS |
2240 | } else if (incr == 1 && (cp - M_OVERHEAD == last_op) |
2241 | && (onb > (1 << LOG_OF_MIN_ARENA))) { | |
2242 | MEM_SIZE require, newarena = nbytes, pow; | |
2243 | int shiftr; | |
2244 | ||
2245 | POW2_OPTIMIZE_ADJUST(newarena); | |
2246 | newarena = newarena + M_OVERHEAD; | |
2247 | /* newarena = (newarena + 3) &~ 3; */ | |
2248 | shiftr = (newarena - 1) >> LOG_OF_MIN_ARENA; | |
2249 | pow = LOG_OF_MIN_ARENA + 1; | |
2250 | /* apart from this loop, this is O(1) */ | |
2251 | while (shiftr >>= 1) | |
2252 | pow++; | |
2253 | newarena = (1 << pow) + POW2_OPTIMIZE_SURPLUS(pow * BUCKETS_PER_POW2); | |
2254 | require = newarena - onb - M_OVERHEAD; | |
2255 | ||
4ad56ec9 IZ |
2256 | MALLOC_LOCK; |
2257 | if (cp - M_OVERHEAD == last_op /* We *still* are the last chunk */ | |
2258 | && getpages_adjacent(require)) { | |
e8bc2b5c | 2259 | #ifdef DEBUGGING_MSTATS |
fa423c5b IZ |
2260 | nmalloc[bucket]--; |
2261 | nmalloc[pow * BUCKETS_PER_POW2]++; | |
e8bc2b5c | 2262 | #endif |
4d6cd4d8 | 2263 | *(cp - M_OVERHEAD) = pow * BUCKETS_PER_POW2; /* Fill index. */ |
4ad56ec9 | 2264 | MALLOC_UNLOCK; |
fa423c5b | 2265 | goto inplace_label; |
4ad56ec9 IZ |
2266 | } else { |
2267 | MALLOC_UNLOCK; | |
fa423c5b | 2268 | goto hard_way; |
4ad56ec9 | 2269 | } |
e8bc2b5c GS |
2270 | } else { |
2271 | hard_way: | |
42ac124e | 2272 | DEBUG_m(PerlIO_printf(Perl_debug_log, |
b900a521 JH |
2273 | "0x%"UVxf": (%05lu) realloc %ld bytes the hard way\n", |
2274 | PTR2UV(cp),(unsigned long)(PL_an++), | |
42ac124e | 2275 | (long)size)); |
86058a2d | 2276 | if ((res = (char*)Perl_malloc(nbytes)) == NULL) |
e8bc2b5c GS |
2277 | return (NULL); |
2278 | if (cp != res) /* common optimization */ | |
2279 | Copy(cp, res, (MEM_SIZE)(nbytes<onb?nbytes:onb), char); | |
4ad56ec9 | 2280 | Perl_mfree(cp); |
45d8adaa | 2281 | } |
2304df62 | 2282 | return ((Malloc_t)res); |
8d063cd8 LW |
2283 | } |
2284 | ||
cf5c4ad8 | 2285 | Malloc_t |
86058a2d | 2286 | Perl_calloc(register size_t elements, register size_t size) |
cf5c4ad8 | 2287 | { |
2288 | long sz = elements * size; | |
86058a2d | 2289 | Malloc_t p = Perl_malloc(sz); |
cf5c4ad8 | 2290 | |
2291 | if (p) { | |
2292 | memset((void*)p, 0, sz); | |
2293 | } | |
2294 | return p; | |
2295 | } | |
2296 | ||
4ad56ec9 IZ |
2297 | char * |
2298 | Perl_strdup(const char *s) | |
2299 | { | |
2300 | MEM_SIZE l = strlen(s); | |
b48f1ba5 | 2301 | char *s1 = (char *)Perl_malloc(l+1); |
4ad56ec9 | 2302 | |
b48f1ba5 | 2303 | Copy(s, s1, (MEM_SIZE)(l+1), char); |
4ad56ec9 IZ |
2304 | return s1; |
2305 | } | |
2306 | ||
2307 | #ifdef PERL_CORE | |
2308 | int | |
2309 | Perl_putenv(char *a) | |
2310 | { | |
2311 | /* Sometimes system's putenv conflicts with my_setenv() - this is system | |
2312 | malloc vs Perl's free(). */ | |
2313 | dTHX; | |
2314 | char *var; | |
2315 | char *val = a; | |
2316 | MEM_SIZE l; | |
2317 | char buf[80]; | |
2318 | ||
2319 | while (*val && *val != '=') | |
2320 | val++; | |
2321 | if (!*val) | |
2322 | return -1; | |
2323 | l = val - a; | |
2324 | if (l < sizeof(buf)) | |
2325 | var = buf; | |
2326 | else | |
2327 | var = Perl_malloc(l + 1); | |
2328 | Copy(a, var, l, char); | |
b48f1ba5 GS |
2329 | var[l + 1] = 0; |
2330 | my_setenv(var, val+1); | |
4ad56ec9 IZ |
2331 | if (var != buf) |
2332 | Perl_mfree(var); | |
2333 | return 0; | |
2334 | } | |
2335 | # endif | |
2336 | ||
e8bc2b5c | 2337 | MEM_SIZE |
cea2e8a9 | 2338 | Perl_malloced_size(void *p) |
e8bc2b5c | 2339 | { |
8d6dde3e IZ |
2340 | union overhead *ovp = (union overhead *) |
2341 | ((caddr_t)p - sizeof (union overhead) * CHUNK_SHIFT); | |
2342 | int bucket = OV_INDEX(ovp); | |
2343 | #ifdef RCHECK | |
2344 | /* The caller wants to have a complete control over the chunk, | |
2345 | disable the memory checking inside the chunk. */ | |
2346 | if (bucket <= MAX_SHORT_BUCKET) { | |
2347 | MEM_SIZE size = BUCKET_SIZE_REAL(bucket); | |
2348 | ovp->ov_size = size + M_OVERHEAD - 1; | |
d0bbed78 | 2349 | *((u_int *)((caddr_t)ovp + size + M_OVERHEAD - RMAGIC_SZ)) = RMAGIC; |
8d6dde3e IZ |
2350 | } |
2351 | #endif | |
e8bc2b5c GS |
2352 | return BUCKET_SIZE_REAL(bucket); |
2353 | } | |
2354 | ||
e8bc2b5c GS |
2355 | # ifdef BUCKETS_ROOT2 |
2356 | # define MIN_EVEN_REPORT 6 | |
2357 | # else | |
2358 | # define MIN_EVEN_REPORT MIN_BUCKET | |
2359 | # endif | |
827e134a GS |
2360 | |
2361 | int | |
2362 | Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level) | |
8d063cd8 | 2363 | { |
df31f264 | 2364 | #ifdef DEBUGGING_MSTATS |
8d063cd8 LW |
2365 | register int i, j; |
2366 | register union overhead *p; | |
4ad56ec9 | 2367 | struct chunk_chain_s* nextchain; |
8d063cd8 | 2368 | |
827e134a GS |
2369 | buf->topbucket = buf->topbucket_ev = buf->topbucket_odd |
2370 | = buf->totfree = buf->total = buf->total_chain = 0; | |
2371 | ||
2372 | buf->minbucket = MIN_BUCKET; | |
4ad56ec9 | 2373 | MALLOC_LOCK; |
e8bc2b5c | 2374 | for (i = MIN_BUCKET ; i < NBUCKETS; i++) { |
8d063cd8 LW |
2375 | for (j = 0, p = nextf[i]; p; p = p->ov_next, j++) |
2376 | ; | |
827e134a GS |
2377 | if (i < buflen) { |
2378 | buf->nfree[i] = j; | |
2379 | buf->ntotal[i] = nmalloc[i]; | |
2380 | } | |
2381 | buf->totfree += j * BUCKET_SIZE_REAL(i); | |
2382 | buf->total += nmalloc[i] * BUCKET_SIZE_REAL(i); | |
e8bc2b5c | 2383 | if (nmalloc[i]) { |
827e134a GS |
2384 | i % 2 ? (buf->topbucket_odd = i) : (buf->topbucket_ev = i); |
2385 | buf->topbucket = i; | |
e8bc2b5c | 2386 | } |
c07a80fd | 2387 | } |
4ad56ec9 IZ |
2388 | nextchain = chunk_chain; |
2389 | while (nextchain) { | |
827e134a | 2390 | buf->total_chain += nextchain->size; |
4ad56ec9 IZ |
2391 | nextchain = nextchain->next; |
2392 | } | |
827e134a GS |
2393 | buf->total_sbrk = goodsbrk + sbrk_slack; |
2394 | buf->sbrks = sbrks; | |
22f7c9c9 | 2395 | buf->sbrk_good = sbrk_goodness; |
827e134a GS |
2396 | buf->sbrk_slack = sbrk_slack; |
2397 | buf->start_slack = start_slack; | |
2398 | buf->sbrked_remains = sbrked_remains; | |
4ad56ec9 | 2399 | MALLOC_UNLOCK; |
880b20b6 | 2400 | buf->nbuckets = NBUCKETS; |
827e134a GS |
2401 | if (level) { |
2402 | for (i = MIN_BUCKET ; i < NBUCKETS; i++) { | |
2403 | if (i >= buflen) | |
2404 | break; | |
d0bbed78 | 2405 | buf->bucket_mem_size[i] = BUCKET_SIZE_NO_SURPLUS(i); |
827e134a GS |
2406 | buf->bucket_available_size[i] = BUCKET_SIZE_REAL(i); |
2407 | } | |
2408 | } | |
2409 | #endif /* defined DEBUGGING_MSTATS */ | |
fe52b3b7 | 2410 | return 0; /* XXX unused */ |
827e134a GS |
2411 | } |
2412 | /* | |
2413 | * mstats - print out statistics about malloc | |
2414 | * | |
2415 | * Prints two lines of numbers, one showing the length of the free list | |
2416 | * for each size category, the second showing the number of mallocs - | |
2417 | * frees for each size category. | |
2418 | */ | |
2419 | void | |
2420 | Perl_dump_mstats(pTHX_ char *s) | |
2421 | { | |
2422 | #ifdef DEBUGGING_MSTATS | |
880b20b6 | 2423 | register int i; |
827e134a | 2424 | perl_mstats_t buffer; |
880b20b6 IZ |
2425 | UV nf[NBUCKETS]; |
2426 | UV nt[NBUCKETS]; | |
827e134a GS |
2427 | |
2428 | buffer.nfree = nf; | |
2429 | buffer.ntotal = nt; | |
2430 | get_mstats(&buffer, NBUCKETS, 0); | |
2431 | ||
c07a80fd | 2432 | if (s) |
bf49b057 | 2433 | PerlIO_printf(Perl_error_log, |
880b20b6 | 2434 | "Memory allocation statistics %s (buckets %"IVdf"(%"IVdf")..%"IVdf"(%"IVdf")\n", |
e8bc2b5c | 2435 | s, |
880b20b6 | 2436 | (IV)BUCKET_SIZE_REAL(MIN_BUCKET), |
d0bbed78 | 2437 | (IV)BUCKET_SIZE_NO_SURPLUS(MIN_BUCKET), |
880b20b6 | 2438 | (IV)BUCKET_SIZE_REAL(buffer.topbucket), |
d0bbed78 | 2439 | (IV)BUCKET_SIZE_NO_SURPLUS(buffer.topbucket)); |
880b20b6 | 2440 | PerlIO_printf(Perl_error_log, "%8"IVdf" free:", buffer.totfree); |
827e134a | 2441 | for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { |
bf49b057 | 2442 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2443 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2444 | ? " %5"UVuf |
2445 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), | |
827e134a | 2446 | buffer.nfree[i]); |
e8bc2b5c GS |
2447 | } |
2448 | #ifdef BUCKETS_ROOT2 | |
bf49b057 | 2449 | PerlIO_printf(Perl_error_log, "\n\t "); |
827e134a | 2450 | for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { |
bf49b057 | 2451 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2452 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2453 | ? " %5"UVuf |
2454 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), | |
827e134a | 2455 | buffer.nfree[i]); |
8d063cd8 | 2456 | } |
e8bc2b5c | 2457 | #endif |
880b20b6 | 2458 | PerlIO_printf(Perl_error_log, "\n%8"IVdf" used:", buffer.total - buffer.totfree); |
827e134a | 2459 | for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { |
bf49b057 | 2460 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2461 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2462 | ? " %5"IVdf |
2463 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), | |
827e134a | 2464 | buffer.ntotal[i] - buffer.nfree[i]); |
c07a80fd | 2465 | } |
e8bc2b5c | 2466 | #ifdef BUCKETS_ROOT2 |
bf49b057 | 2467 | PerlIO_printf(Perl_error_log, "\n\t "); |
827e134a | 2468 | for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { |
bf49b057 | 2469 | PerlIO_printf(Perl_error_log, |
e8bc2b5c | 2470 | ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) |
880b20b6 IZ |
2471 | ? " %5"IVdf |
2472 | : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), | |
827e134a | 2473 | buffer.ntotal[i] - buffer.nfree[i]); |
e8bc2b5c GS |
2474 | } |
2475 | #endif | |
880b20b6 | 2476 | PerlIO_printf(Perl_error_log, "\nTotal sbrk(): %"IVdf"/%"IVdf":%"IVdf". Odd ends: pad+heads+chain+tail: %"IVdf"+%"IVdf"+%"IVdf"+%"IVdf".\n", |
827e134a GS |
2477 | buffer.total_sbrk, buffer.sbrks, buffer.sbrk_good, |
2478 | buffer.sbrk_slack, buffer.start_slack, | |
2479 | buffer.total_chain, buffer.sbrked_remains); | |
df31f264 | 2480 | #endif /* DEBUGGING_MSTATS */ |
c07a80fd | 2481 | } |
a687059c | 2482 | #endif /* lint */ |
cf5c4ad8 | 2483 | |
cf5c4ad8 | 2484 | #ifdef USE_PERL_SBRK |
2485 | ||
e3663bad | 2486 | # if defined(__MACHTEN_PPC__) || defined(NeXT) || defined(__NeXT__) || defined(PURIFY) |
38ac2dc8 | 2487 | # define PERL_SBRK_VIA_MALLOC |
38ac2dc8 DD |
2488 | # endif |
2489 | ||
760ac839 | 2490 | # ifdef PERL_SBRK_VIA_MALLOC |
cf5c4ad8 | 2491 | |
2492 | /* it may seem schizophrenic to use perl's malloc and let it call system */ | |
2493 | /* malloc, the reason for that is only the 3.2 version of the OS that had */ | |
2494 | /* frequent core dumps within nxzonefreenolock. This sbrk routine put an */ | |
2495 | /* end to the cores */ | |
2496 | ||
38ac2dc8 DD |
2497 | # ifndef SYSTEM_ALLOC |
2498 | # define SYSTEM_ALLOC(a) malloc(a) | |
2499 | # endif | |
5bbd1ef5 IZ |
2500 | # ifndef SYSTEM_ALLOC_ALIGNMENT |
2501 | # define SYSTEM_ALLOC_ALIGNMENT MEM_ALIGNBYTES | |
2502 | # endif | |
cf5c4ad8 | 2503 | |
760ac839 | 2504 | # endif /* PERL_SBRK_VIA_MALLOC */ |
cf5c4ad8 | 2505 | |
2506 | static IV Perl_sbrk_oldchunk; | |
2507 | static long Perl_sbrk_oldsize; | |
2508 | ||
760ac839 LW |
2509 | # define PERLSBRK_32_K (1<<15) |
2510 | # define PERLSBRK_64_K (1<<16) | |
cf5c4ad8 | 2511 | |
b63effbb | 2512 | Malloc_t |
df0003d4 | 2513 | Perl_sbrk(int size) |
cf5c4ad8 | 2514 | { |
2515 | IV got; | |
2516 | int small, reqsize; | |
2517 | ||
2518 | if (!size) return 0; | |
55497cff | 2519 | #ifdef PERL_CORE |
cf5c4ad8 | 2520 | reqsize = size; /* just for the DEBUG_m statement */ |
2521 | #endif | |
57569e04 HM |
2522 | #ifdef PACK_MALLOC |
2523 | size = (size + 0x7ff) & ~0x7ff; | |
2524 | #endif | |
cf5c4ad8 | 2525 | if (size <= Perl_sbrk_oldsize) { |
2526 | got = Perl_sbrk_oldchunk; | |
2527 | Perl_sbrk_oldchunk += size; | |
2528 | Perl_sbrk_oldsize -= size; | |
2529 | } else { | |
2530 | if (size >= PERLSBRK_32_K) { | |
2531 | small = 0; | |
2532 | } else { | |
cf5c4ad8 | 2533 | size = PERLSBRK_64_K; |
2534 | small = 1; | |
2535 | } | |
5bbd1ef5 IZ |
2536 | # if NEEDED_ALIGNMENT > SYSTEM_ALLOC_ALIGNMENT |
2537 | size += NEEDED_ALIGNMENT - SYSTEM_ALLOC_ALIGNMENT; | |
2538 | # endif | |
cf5c4ad8 | 2539 | got = (IV)SYSTEM_ALLOC(size); |
5bbd1ef5 | 2540 | # if NEEDED_ALIGNMENT > SYSTEM_ALLOC_ALIGNMENT |
5a7d6335 | 2541 | got = (got + NEEDED_ALIGNMENT - 1) & ~(NEEDED_ALIGNMENT - 1); |
5bbd1ef5 | 2542 | # endif |
cf5c4ad8 | 2543 | if (small) { |
2544 | /* Chunk is small, register the rest for future allocs. */ | |
2545 | Perl_sbrk_oldchunk = got + reqsize; | |
2546 | Perl_sbrk_oldsize = size - reqsize; | |
2547 | } | |
2548 | } | |
2549 | ||
b900a521 JH |
2550 | DEBUG_m(PerlIO_printf(Perl_debug_log, "sbrk malloc size %ld (reqsize %ld), left size %ld, give addr 0x%"UVxf"\n", |
2551 | size, reqsize, Perl_sbrk_oldsize, PTR2UV(got))); | |
cf5c4ad8 | 2552 | |
2553 | return (void *)got; | |
2554 | } | |
2555 | ||
2556 | #endif /* ! defined USE_PERL_SBRK */ |