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