3 Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 Contact: cacao@cacaojvm.org
27 Authors: Reinhard Grafl
31 $Id: memory.c 6256 2006-12-28 12:30:09Z twisti $
46 #if defined(__DARWIN__)
47 /* If we compile with -ansi on darwin, <sys/types.h> is not
48 included. So let's do it here. */
49 # include <sys/types.h>
56 #include "mm/memory.h"
57 #include "native/native.h"
59 #if defined(ENABLE_THREADS)
60 # include "threads/native/lock.h"
61 # include "threads/native/threads.h"
63 # include "threads/none/lock.h"
66 #include "toolbox/logging.h"
67 #include "vm/exceptions.h"
68 #include "vm/global.h"
69 #include "vm/options.h"
70 #include "vm/statistics.h"
71 #include "vm/stringlocal.h"
75 /* constants for ENABLE_MEMCHECK **********************************************/
77 #if defined(ENABLE_MEMCHECK)
78 #define MEMORY_CANARY_SIZE 16
79 #define MEMORY_CANARY_FIRST_BYTE 0xca
80 #define MEMORY_CLEAR_BYTE 0xa5
81 #endif /* defined(ENABLE_MEMCHECK) */
84 /*******************************************************************************
86 This structure is used for dump memory allocation if cacao
89 *******************************************************************************/
91 #if !defined(ENABLE_THREADS)
92 static dumpinfo_t _no_threads_dumpinfo;
95 #if defined(ENABLE_THREADS)
96 #define DUMPINFO &((threadobject *) THREADOBJECT)->dumpinfo
98 #define DUMPINFO &_no_threads_dumpinfo
102 /* global code memory variables ***********************************************/
104 #define DEFAULT_CODE_MEMORY_SIZE 128 * 1024 /* defaulting to 128kB */
106 #if defined(ENABLE_THREADS)
107 static java_objectheader *lock_code_memory = NULL;
109 static void *code_memory = NULL;
110 static int code_memory_size = 0;
111 static int pagesize = 0;
114 /* memory_init *****************************************************************
116 Initialize the memory subsystem.
118 *******************************************************************************/
120 bool memory_init(void)
122 #if defined(ENABLE_THREADS)
123 lock_code_memory = NEW(java_objectheader);
125 lock_init_object_lock(lock_code_memory);
128 /* get the pagesize of this architecture */
130 pagesize = getpagesize();
132 /* everything's ok */
138 /* memory_mmap_anon ************************************************************
140 Maps anonymous memory, even on systems not defining
143 *******************************************************************************/
145 void *memory_mmap_anon(void *addr, size_t len, int prot, int flags)
149 #if defined(MAP_ANON) || defined(MAP_ANONYMOUS)
150 p = mmap(addr, len, prot,
151 # if defined(MAP_ANON)
154 MAP_ANONYMOUS | flags,
160 fd = open("/dev/zero", O_RDONLY, 0);
163 vm_abort("memory_mmap_anon: open failed: %s", strerror(errno));
165 p = mmap(addr, len, prot, flags, fd, 0);
168 #if defined(MAP_FAILED)
171 if (p == (void *) -1)
173 vm_abort("memory_mmap_anon: mmap failed: %s", strerror(errno));
179 /* memory_checked_alloc ********************************************************
181 Allocated zeroed-out memory and does an OOM check.
184 XXX If no memory could be allocated, this function justs *exists*.
186 *******************************************************************************/
188 static void *memory_checked_alloc(s4 size)
190 /* always allocate memory zeroed out */
192 void *p = calloc(size, 1);
195 exceptions_throw_outofmemory_exit();
201 /* memory_cnew *****************************************************************
203 Allocates memory from the heap via mmap and make the memory read-,
204 write-, and executeable.
206 *******************************************************************************/
208 void *memory_cnew(s4 size)
212 LOCK_MONITOR_ENTER(lock_code_memory);
214 size = MEMORY_ALIGN(size, ALIGNSIZE);
216 /* check if enough memory is available */
218 if (size > code_memory_size) {
219 /* set default code size */
221 code_memory_size = DEFAULT_CODE_MEMORY_SIZE;
223 /* do we need more? */
225 if (size > code_memory_size)
226 code_memory_size = size;
228 /* align the size of the memory to be allocated */
230 code_memory_size = MEMORY_ALIGN(code_memory_size, pagesize);
232 #if defined(ENABLE_STATISTICS)
234 codememusage += code_memory_size;
236 if (codememusage > maxcodememusage)
237 maxcodememusage = codememusage;
241 /* allocate the memory */
243 p = memory_mmap_anon(NULL, code_memory_size,
244 PROT_READ | PROT_WRITE | PROT_EXEC,
247 /* set global code memory pointer */
252 /* get a memory chunk of the allocated memory */
256 code_memory = (void *) ((ptrint) code_memory + size);
257 code_memory_size -= size;
259 LOCK_MONITOR_EXIT(lock_code_memory);
265 /* memory_cfree ****************************************************************
267 Frees the code memory pointed to.
269 ATTENTION: This function currently does NOTHING! Because we don't
270 have a memory management for code memory.
272 *******************************************************************************/
274 void memory_cfree(void *p, s4 size)
280 void *mem_alloc(s4 size)
287 #if defined(ENABLE_STATISTICS)
291 if (memoryusage > maxmemusage)
292 maxmemusage = memoryusage;
296 m = memory_checked_alloc(size);
298 #if defined(ENABLE_MEMCHECK)
299 /* XXX we would like to poison the memory, but callers rely on */
300 /* the zeroing. This should change sooner or later. */
301 /* memset(m, MEMORY_CLEAR_BYTE, size); */
308 void *mem_realloc(void *src, s4 len1, s4 len2)
314 log_text("reallocating memoryblock with address NULL, length != 0");
319 #if defined(ENABLE_STATISTICS)
321 memoryusage = (memoryusage - len1) + len2;
324 #if defined(ENABLE_MEMCHECK)
326 memset((u1*)dst + len2, MEMORY_CLEAR_BYTE, len1 - len2);
329 dst = realloc(src, len2);
332 exceptions_throw_outofmemory_exit();
334 #if defined(ENABLE_MEMCHECK)
336 memset((u1*)dst + len1, MEMORY_CLEAR_BYTE, len2 - len1);
343 void mem_free(void *m, s4 size)
349 log_text("returned memoryblock with address NULL, length != 0");
353 #if defined(ENABLE_STATISTICS)
358 #if defined(ENABLE_MEMCHECK)
359 /* destroy the contents */
360 memset(m, MEMORY_CLEAR_BYTE, size);
367 /* dump_check_canaries *********************************************************
369 Check canaries in dump memory.
372 di...........dumpinfo_t * of the dump area to check
373 bottomsize...dump size down to which the dump area should be checked
374 (specify 0 to check the whole dump area)
377 If any canary has been changed, this function aborts the VM with
380 *******************************************************************************/
382 #if defined(ENABLE_MEMCHECK)
383 void dump_check_canaries(dumpinfo_t *di, s4 bottomsize)
385 dump_allocation_t *da;
389 /* iterate over all dump memory allocations above bottomsize */
391 da = di->allocations;
392 while (da && da->useddumpsize >= bottomsize) {
395 pm = da->mem - MEMORY_CANARY_SIZE;
396 for (i=0; i<MEMORY_CANARY_SIZE; ++i)
397 if (pm[i] != i + MEMORY_CANARY_FIRST_BYTE) {
398 fprintf(stderr, "canary bytes:");
399 for (j=0; j<MEMORY_CANARY_SIZE; ++j)
400 fprintf(stderr, " %02x", pm[j]);
401 fprintf(stderr,"\n");
402 vm_abort("error: dump memory bottom canary killed: "
403 "%p (%d bytes allocated at %p)\n",
404 pm + i, da->size, da->mem);
407 pm = da->mem + da->size;
408 for (i=0; i<MEMORY_CANARY_SIZE; ++i)
409 if (pm[i] != i + MEMORY_CANARY_FIRST_BYTE) {
410 fprintf(stderr, "canary bytes:");
411 for (j=0; j<MEMORY_CANARY_SIZE; ++j)
412 fprintf(stderr, " %02x", pm[j]);
413 fprintf(stderr,"\n");
414 vm_abort("error: dump memory top canary killed: "
415 "%p (%d bytes allocated at %p)\n",
416 pm + i, da->size, da->mem);
422 #endif /* defined(ENABLE_MEMCHECK) */
425 /* dump_alloc ******************************************************************
427 Allocate memory in the dump area.
430 size.........size of block to allocate, in bytes
431 may be zero, in which case NULL is returned
434 pointer to allocated memory, or
435 NULL iff `size` was zero
438 XXX This function uses `memory_checked_alloc`, which *exits* if no
439 memory could be allocated.
442 dump_alloc is thread safe. Each thread has its own dump memory area.
444 dump_alloc is a fast allocator suitable for scratch memory that can be
445 collectively freed when the current activity (eg. compiling) is done.
447 You cannot selectively free dump memory. Before you start allocating it,
448 you remember the current size returned by `dump_size`. Later, when you no
449 longer need the memory, call `dump_release` with the remembered size and
450 all dump memory allocated since the call to `dump_size` will be freed.
452 *******************************************************************************/
454 void *dump_alloc(s4 size)
456 #if defined(DISABLE_DUMP)
458 /* use malloc memory for dump memory (for debugging only!) */
460 return mem_alloc(size);
462 #else /* !defined(DISABLE_DUMP) */
466 #if defined(ENABLE_MEMCHECK)
467 s4 origsize = size; /* needed for the canary system */
470 /* If no threads are used, the dumpinfo structure is a static structure */
471 /* defined at the top of this file. */
478 #if defined(ENABLE_MEMCHECK)
479 size += 2*MEMORY_CANARY_SIZE;
482 size = MEMORY_ALIGN(size, ALIGNSIZE);
484 if (di->useddumpsize + size > di->allocateddumpsize) {
485 dumpblock_t *newdumpblock;
488 /* allocate a new dumplist structure */
490 newdumpblock = memory_checked_alloc(sizeof(dumpblock_t));
492 /* If requested size is greater than the default, make the new dump */
493 /* block as big as the size requested. Else use the default size. */
495 if (size > DUMPBLOCKSIZE) {
496 newdumpblocksize = size;
499 newdumpblocksize = DUMPBLOCKSIZE;
502 /* allocate dumpblock memory */
504 newdumpblock->dumpmem = memory_checked_alloc(newdumpblocksize);
506 newdumpblock->prev = di->currentdumpblock;
507 newdumpblock->size = newdumpblocksize;
508 di->currentdumpblock = newdumpblock;
510 /* Used dump size is previously allocated dump size, because the */
511 /* remaining free memory of the previous dump block cannot be used. */
513 di->useddumpsize = di->allocateddumpsize;
515 /* increase the allocated dump size by the size of the new dump block */
517 di->allocateddumpsize += newdumpblocksize;
519 #if defined(ENABLE_STATISTICS)
520 /* the amount of globally allocated dump memory (thread save) */
523 globalallocateddumpsize += newdumpblocksize;
527 /* current dump block base address + the size of the current dump block - */
528 /* the size of the unused memory = new start address */
530 m = di->currentdumpblock->dumpmem + di->currentdumpblock->size -
531 (di->allocateddumpsize - di->useddumpsize);
533 #if defined(ENABLE_MEMCHECK)
535 dump_allocation_t *da = NEW(dump_allocation_t);
539 /* add the allocation to our linked list of allocations */
541 da->next = di->allocations;
542 da->mem = (u1*) m + MEMORY_CANARY_SIZE;
544 da->useddumpsize = di->useddumpsize;
546 di->allocations = da;
548 /* write the canaries */
551 for (i=0; i<MEMORY_CANARY_SIZE; ++i)
552 pm[i] = i + MEMORY_CANARY_FIRST_BYTE;
553 pm = da->mem + da->size;
554 for (i=0; i<MEMORY_CANARY_SIZE; ++i)
555 pm[i] = i + MEMORY_CANARY_FIRST_BYTE;
557 /* make m point after the bottom canary */
559 m = (u1*)m + MEMORY_CANARY_SIZE;
561 /* clear the memory */
563 memset(m, MEMORY_CLEAR_BYTE, da->size);
565 #endif /* defined(ENABLE_MEMCHECK) */
567 /* increase used dump size by the allocated memory size */
569 di->useddumpsize += size;
571 #if defined(ENABLE_STATISTICS)
573 if (di->useddumpsize > maxdumpsize)
574 maxdumpsize = di->useddumpsize;
579 #endif /* defined(DISABLE_DUMP) */
583 /* dump_realloc ****************************************************************
585 Stupid realloc implementation for dump memory. Avoid, if possible.
587 *******************************************************************************/
589 void *dump_realloc(void *src, s4 len1, s4 len2)
591 #if defined(DISABLE_DUMP)
592 /* use malloc memory for dump memory (for debugging only!) */
594 return mem_realloc(src, len1, len2);
596 void *dst = dump_alloc(len2);
598 memcpy(dst, src, len1);
600 #if defined(ENABLE_MEMCHECK)
601 /* destroy the source */
602 memset(src, MEMORY_CLEAR_BYTE, len1);
610 /* dump_release ****************************************************************
612 Release dump memory above the given size.
615 size........All dump memory above this mark will be freed. Usually
616 `size` will be the return value of a `dump_size` call
620 XXX If the given size is invalid, this function *exits* with an
625 *******************************************************************************/
627 void dump_release(s4 size)
629 #if defined(DISABLE_DUMP)
631 /* use malloc memory for dump memory (for debugging only!) */
635 #else /* !defined(DISABLE_DUMP) */
639 /* If no threads are used, the dumpinfo structure is a static structure */
640 /* defined at the top of this file. */
644 if ((size < 0) || (size > di->useddumpsize))
645 vm_abort("Illegal dump release size: %d", size);
647 #if defined(ENABLE_MEMCHECK)
649 dump_allocation_t *da, *next;
653 dump_check_canaries(di, size);
655 /* iterate over all dump memory allocations about to be released */
657 da = di->allocations;
658 while (da && da->useddumpsize >= size) {
661 /* invalidate the freed memory */
663 memset(da->mem, MEMORY_CLEAR_BYTE, da->size);
665 FREE(da, dump_allocation_t);
669 di->allocations = da;
671 #endif /* defined(ENABLE_MEMCHECK) */
673 /* reset the used dump size to the size specified */
675 di->useddumpsize = size;
677 while (di->currentdumpblock && di->allocateddumpsize - di->currentdumpblock->size >= di->useddumpsize) {
678 dumpblock_t *tmp = di->currentdumpblock;
680 di->allocateddumpsize -= tmp->size;
681 di->currentdumpblock = tmp->prev;
683 #if defined(ENABLE_STATISTICS)
684 /* the amount of globally allocated dump memory (thread save) */
687 globalallocateddumpsize -= tmp->size;
690 /* release the dump memory and the dumpinfo structure */
696 #endif /* defined(DISABLE_DUMP) */
700 /* dump_size *******************************************************************
702 Return the current size of the dump memory area. See `dump_alloc`.
704 *******************************************************************************/
708 #if defined(DISABLE_DUMP)
709 /* use malloc memory for dump memory (for debugging only!) */
713 #else /* !defined(DISABLE_DUMP) */
717 /* If no threads are used, the dumpinfo structure is a static structure */
718 /* defined at the top of this file. */
725 return di->useddumpsize;
727 #endif /* defined(DISABLE_DUMP) */
732 * These are local overrides for various environment variables in Emacs.
733 * Please do not remove this and leave it at the end of the file, where
734 * Emacs will automagically detect them.
735 * ---------------------------------------------------------------------
738 * indent-tabs-mode: t
742 * vim:noexpandtab:sw=4:ts=4: