+++ /dev/null
-/*
- * Copyright (c) 1999, 2006-2008 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <pthread_internals.h>
-#include "magmallocProvider.h"
-#include <mach-o/dyld.h> /* for NSVersionOfLinkTimeLibrary() */
-
-#import <stdlib.h>
-#import <stdio.h>
-#import <string.h>
-#import <unistd.h>
-#import <malloc/malloc.h>
-#import <fcntl.h>
-#import <crt_externs.h>
-#import <errno.h>
-#import <pthread_internals.h>
-#import <limits.h>
-#import <dlfcn.h>
-#import <mach/mach_vm.h>
-#import <mach/mach_init.h>
-#import <sys/mman.h>
-
-#import "scalable_malloc.h"
-#import "stack_logging.h"
-#import "malloc_printf.h"
-#import "_simple.h"
-#import "CrashReporterClient.h"
-
-/*
- * MALLOC_ABSOLUTE_MAX_SIZE - There are many instances of addition to a
- * user-specified size_t, which can cause overflow (and subsequent crashes)
- * for values near SIZE_T_MAX. Rather than add extra "if" checks everywhere
- * this occurs, it is easier to just set an absolute maximum request size,
- * and immediately return an error if the requested size exceeds this maximum.
- * Of course, values less than this absolute max can fail later if the value
- * is still too large for the available memory. The largest value added
- * seems to be PAGE_SIZE (in the macro round_page()), so to be safe, we set
- * the maximum to be 2 * PAGE_SIZE less than SIZE_T_MAX.
- */
-#define MALLOC_ABSOLUTE_MAX_SIZE (SIZE_T_MAX - (2 * PAGE_SIZE))
-
-#define USE_SLEEP_RATHER_THAN_ABORT 0
-
-typedef void (malloc_logger_t)(uint32_t type, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t result, uint32_t num_hot_frames_to_skip);
-
-__private_extern__ pthread_lock_t _malloc_lock = 0; // initialized in __libc_init
-
-/* The following variables are exported for the benefit of performance tools
- *
- * It should always be safe to first read malloc_num_zones, then read
- * malloc_zones without taking the lock, if only iteration is required and
- * provided that when malloc_destroy_zone is called all prior operations on that
- * zone are complete and no further calls referencing that zone can be made.
- */
-unsigned malloc_num_zones = 0;
-unsigned malloc_num_zones_allocated = 0;
-malloc_zone_t **malloc_zones = 0;
-malloc_logger_t *malloc_logger = NULL;
-
-unsigned malloc_debug_flags = 0;
-
-unsigned malloc_check_start = 0; // 0 means don't check
-unsigned malloc_check_counter = 0;
-unsigned malloc_check_each = 1000;
-
-/* global flag to suppress ASL logging e.g. for syslogd */
-int _malloc_no_asl_log = 0;
-
-static int malloc_check_sleep = 100; // default 100 second sleep
-static int malloc_check_abort = 0; // default is to sleep, not abort
-
-static int malloc_debug_file = STDERR_FILENO;
-/*
- * State indicated by malloc_def_zone_state
- * 0 - the default zone has not yet been created
- * 1 - a Malloc* environment variable has been set
- * 2 - the default zone has been created and an environment variable scan done
- * 3 - a new default zone has been created and another environment variable scan
- */
-__private_extern__ int malloc_def_zone_state = 0;
-
-static const char Malloc_Facility[] = "com.apple.Libsystem.malloc";
-
-#define MALLOC_LOCK() LOCK(_malloc_lock)
-#define MALLOC_UNLOCK() UNLOCK(_malloc_lock)
-
-/*
- * Counters that coordinate zone destruction (in malloc_zone_unregister) with
- * find_registered_zone (here abbreviated as FRZ).
- */
-static int counterAlice = 0, counterBob = 0;
-static int *pFRZCounterLive= &counterAlice, *pFRZCounterDrain = &counterBob;
-
-#define MALLOC_LOG_TYPE_ALLOCATE stack_logging_type_alloc
-#define MALLOC_LOG_TYPE_DEALLOCATE stack_logging_type_dealloc
-#define MALLOC_LOG_TYPE_HAS_ZONE stack_logging_flag_zone
-#define MALLOC_LOG_TYPE_CLEARED stack_logging_flag_cleared
-
-/********* Utilities ************/
-__private_extern__ uint64_t malloc_entropy[2] = {0, 0};
-
-void __malloc_entropy_setup(const char *apple[]) __attribute__ ((visibility ("hidden")));
-
-static int
-__entropy_from_kernel(const char *str)
-{
- unsigned long long val;
- char tmp[20], *p;
- int idx = 0;
-
- /* Skip over key to the first value */
- str = strchr(str, '=');
- if (str == NULL)
- return 0;
- str++;
-
- while (str && idx < sizeof(malloc_entropy)/sizeof(malloc_entropy[0])) {
- strlcpy(tmp, str, 20);
- p = strchr(tmp, ',');
- if (p) *p = '\0';
- val = strtoull(tmp, NULL, 0);
- malloc_entropy[idx] = (uint64_t)val;
- idx++;
- if ((str = strchr(str, ',')) != NULL)
- str++;
- }
- return idx;
-}
-
-void
-__malloc_entropy_setup(const char *apple[])
-{
- const char **p;
- for (p = apple; p && *p; p++) {
- if (strstr(*p, "malloc_entropy") == *p) {
- if (sizeof(malloc_entropy)/sizeof(malloc_entropy[0]) == __entropy_from_kernel(*p))
- return;
- else
- break;
- }
- }
-
- malloc_entropy[0] = ((uint64_t)arc4random()) << 32 | ((uint64_t)arc4random());
- malloc_entropy[1] = ((uint64_t)arc4random()) << 32 | ((uint64_t)arc4random());
- return;
-}
-
-static inline malloc_zone_t * find_registered_zone(const void *, size_t *) __attribute__((always_inline));
-static inline malloc_zone_t *
-find_registered_zone(const void *ptr, size_t *returned_size) {
- // Returns a zone which contains ptr, else NULL
-
- if (0 == malloc_num_zones) {
- if (returned_size) *returned_size = 0;
- return NULL;
- }
-
- // The default zone is registered in malloc_zones[0]. There's no danger that it will ever be unregistered.
- // So don't advance the FRZ counter yet.
- malloc_zone_t *zone = malloc_zones[0];
- size_t size = zone->size(zone, ptr);
- if (size) { // Claimed by this zone?
- if (returned_size) *returned_size = size;
- return zone;
- }
-
- int *pFRZCounter = pFRZCounterLive; // Capture pointer to the counter of the moment
- __sync_fetch_and_add(pFRZCounter, 1); // Advance this counter -- our thread is in FRZ
-
- unsigned index;
- unsigned limit = malloc_num_zones;
- malloc_zone_t **zones = &malloc_zones[1];
-
- for (index = 1; index < limit; ++index, ++zones) {
- zone = *zones;
- size = zone->size(zone, ptr);
- if (size) { // Claimed by this zone?
- if (returned_size) *returned_size = size;
- __sync_fetch_and_sub(pFRZCounter, 1); // our thread is leaving FRZ
- return zone;
- }
- }
- // Unclaimed by any zone.
- if (returned_size) *returned_size = 0;
- __sync_fetch_and_sub(pFRZCounter, 1); // our thread is leaving FRZ
- return NULL;
-}
-
-__private_extern__ __attribute__((noinline)) void
-malloc_error_break(void) {
- // Provides a non-inlined place for various malloc error procedures to call
- // that will be called after an error message appears. It does not make
- // sense for developers to call this function, so it is marked
- // __private_extern__ to prevent it from becoming API.
- MAGMALLOC_MALLOCERRORBREAK(); // DTrace USDT probe
-}
-
-__private_extern__ boolean_t __stack_logging_locked();
-
-__private_extern__ __attribute__((noinline)) __attribute__((used)) int
-malloc_gdb_po_unsafe(void) {
- // In order to implement "po" other data formatters in gdb, the debugger
- // calls functions that call malloc. The debugger will only run one thread
- // of the program in this case, so if another thread is holding a zone lock,
- // gdb may deadlock in this case.
- //
- // Iterate over the zones in malloc_zones, and call "trylock" on the zone
- // lock. If trylock succeeds, unlock it, otherwise return "locked". Returns
- // 0 == safe, 1 == locked/unsafe.
-
- if (__stack_logging_locked())
- return 1;
-
- malloc_zone_t **zones = malloc_zones;
- unsigned i, e = malloc_num_zones;
-
- for (i = 0; i != e; ++i) {
- malloc_zone_t *zone = zones[i];
-
- // Version must be >= 5 to look at the new introspection field.
- if (zone->version < 5)
- continue;
-
- if (zone->introspect->zone_locked && zone->introspect->zone_locked(zone))
- return 1;
- }
- return 0;
-}
-
-/********* Creation and destruction ************/
-
-static void set_flags_from_environment(void);
-
-static void
-malloc_zone_register_while_locked(malloc_zone_t *zone) {
- size_t protect_size;
- unsigned i;
-
- /* scan the list of zones, to see if this zone is already registered. If
- * so, print an error message and return. */
- for (i = 0; i != malloc_num_zones; ++i)
- if (zone == malloc_zones[i]) {
- _malloc_printf(ASL_LEVEL_ERR, "Attempted to register zone more than once: %p\n", zone);
- return;
- }
-
- if (malloc_num_zones == malloc_num_zones_allocated) {
- size_t malloc_zones_size = malloc_num_zones * sizeof(malloc_zone_t *);
- size_t alloc_size = malloc_zones_size + vm_page_size;
-
- malloc_zone_t **new_zones = mmap(0, alloc_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, VM_MAKE_TAG(VM_MEMORY_MALLOC), 0);
-
- /* If there were previously allocated malloc zones, we need to copy them
- * out of the previous array and into the new zones array */
- if (malloc_zones)
- memcpy(new_zones, malloc_zones, malloc_zones_size);
-
- /* Update the malloc_zones pointer, which we leak if it was previously
- * allocated, and the number of zones allocated */
- protect_size = alloc_size;
- malloc_zones = new_zones;
- malloc_num_zones_allocated = alloc_size / sizeof(malloc_zone_t *);
- } else {
- /* If we don't need to reallocate zones, we need to briefly change the
- * page protection the malloc zones to allow writes */
- protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
- mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
- }
- malloc_zones[malloc_num_zones++] = zone;
-
- /* Finally, now that the zone is registered, disallow write access to the
- * malloc_zones array */
- mprotect(malloc_zones, protect_size, PROT_READ);
- //_malloc_printf(ASL_LEVEL_INFO, "Registered malloc_zone %p in malloc_zones %p [%u zones, %u bytes]\n", zone, malloc_zones, malloc_num_zones, protect_size);
-}
-
-static void
-_malloc_initialize(void) {
- MALLOC_LOCK();
- if (malloc_def_zone_state < 2) {
- unsigned n;
- malloc_zone_t *zone;
-
- malloc_def_zone_state += 2;
- set_flags_from_environment(); // will only set flags up to two times
- n = malloc_num_zones;
- zone = create_scalable_zone(0, malloc_debug_flags);
- malloc_zone_register_while_locked(zone);
- malloc_set_zone_name(zone, "DefaultMallocZone");
- if (n != 0) { // make the default first, for efficiency
- unsigned protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
- malloc_zone_t *hold = malloc_zones[0];
-
- if(hold->zone_name && strcmp(hold->zone_name, "DefaultMallocZone") == 0) {
- malloc_set_zone_name(hold, NULL);
- }
-
- mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
- malloc_zones[0] = malloc_zones[n];
- malloc_zones[n] = hold;
- mprotect(malloc_zones, protect_size, PROT_READ);
- }
- // _malloc_printf(ASL_LEVEL_INFO, "%d registered zones\n", malloc_num_zones);
- // _malloc_printf(ASL_LEVEL_INFO, "malloc_zones is at %p; malloc_num_zones is at %p\n", (unsigned)&malloc_zones, (unsigned)&malloc_num_zones);
- }
- MALLOC_UNLOCK();
-}
-
-static inline malloc_zone_t *inline_malloc_default_zone(void) __attribute__((always_inline));
-static inline malloc_zone_t *
-inline_malloc_default_zone(void) {
- if (malloc_def_zone_state < 2) _malloc_initialize();
- // _malloc_printf(ASL_LEVEL_INFO, "In inline_malloc_default_zone with %d %d\n", malloc_num_zones, malloc_has_debug_zone);
- return malloc_zones[0];
-}
-
-malloc_zone_t *
-malloc_default_zone(void) {
- return inline_malloc_default_zone();
-}
-
-static inline malloc_zone_t *inline_malloc_default_scalable_zone(void) __attribute__((always_inline));
-static inline malloc_zone_t *
-inline_malloc_default_scalable_zone(void) {
- unsigned index;
-
- if (malloc_def_zone_state < 2) _malloc_initialize();
- // _malloc_printf(ASL_LEVEL_INFO, "In inline_malloc_default_scalable_zone with %d %d\n", malloc_num_zones, malloc_has_debug_zone);
-
- MALLOC_LOCK();
- for (index = 0; index < malloc_num_zones; ++index) {
- malloc_zone_t *z = malloc_zones[index];
-
- if(z->zone_name && strcmp(z->zone_name, "DefaultMallocZone") == 0) {
- MALLOC_UNLOCK();
- return z;
- }
- }
- MALLOC_UNLOCK();
-
- malloc_printf("*** malloc_default_scalable_zone() failed to find 'DefaultMallocZone'\n");
- return NULL; // FIXME: abort() instead?
-}
-
-malloc_zone_t *
-malloc_default_purgeable_zone(void) {
- static malloc_zone_t *dpz;
-
- if (!dpz) {
- //
- // PR_7288598: Must pass a *scalable* zone (szone) as the helper for create_purgeable_zone().
- // Take care that the zone so obtained is not subject to interposing.
- //
- malloc_zone_t *tmp = create_purgeable_zone(0, inline_malloc_default_scalable_zone(), malloc_debug_flags);
- malloc_zone_register(tmp);
- malloc_set_zone_name(tmp, "DefaultPurgeableMallocZone");
- if (!__sync_bool_compare_and_swap(&dpz, NULL, tmp))
- malloc_destroy_zone(tmp);
- }
- return dpz;
-}
-
-// For debugging, allow stack logging to both memory and disk to compare their results.
-static void
-stack_logging_log_stack_debug(uint32_t type_flags, uintptr_t zone_ptr, uintptr_t size, uintptr_t ptr_arg, uintptr_t return_val, uint32_t num_hot_to_skip)
-{
- __disk_stack_logging_log_stack(type_flags, zone_ptr, size, ptr_arg, return_val, num_hot_to_skip);
- stack_logging_log_stack(type_flags, zone_ptr, size, ptr_arg, return_val, num_hot_to_skip);
-}
-
-static void
-set_flags_from_environment(void) {
- const char *flag;
- int fd;
- char **env = * _NSGetEnviron();
- char **p;
- char *c;
-
- if (malloc_debug_file != STDERR_FILENO) {
- close(malloc_debug_file);
- malloc_debug_file = STDERR_FILENO;
- }
-#if __LP64__
- malloc_debug_flags = SCALABLE_MALLOC_ABORT_ON_CORRUPTION; // Set always on 64-bit processes
-#else
- int libSystemVersion = NSVersionOfLinkTimeLibrary("System");
- if ((-1 != libSystemVersion) && ((libSystemVersion >> 16) < 126) /* Lion or greater */)
- malloc_debug_flags = 0;
- else
- malloc_debug_flags = SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
-#endif
- stack_logging_enable_logging = 0;
- stack_logging_dontcompact = 0;
- malloc_logger = NULL;
- malloc_check_start = 0;
- malloc_check_each = 1000;
- malloc_check_abort = 0;
- malloc_check_sleep = 100;
- /*
- * Given that all environment variables start with "Malloc" we optimize by scanning quickly
- * first the environment, therefore avoiding repeated calls to getenv().
- * If we are setu/gid these flags are ignored to prevent a malicious invoker from changing
- * our behaviour.
- */
- for (p = env; (c = *p) != NULL; ++p) {
- if (!strncmp(c, "Malloc", 6)) {
- if (issetugid())
- return;
- break;
- }
- }
- if (c == NULL)
- return;
- flag = getenv("MallocLogFile");
- if (flag) {
- fd = open(flag, O_WRONLY|O_APPEND|O_CREAT, 0644);
- if (fd >= 0) {
- malloc_debug_file = fd;
- fcntl(fd, F_SETFD, 0); // clear close-on-exec flag XXX why?
- } else {
- malloc_printf("Could not open %s, using stderr\n", flag);
- }
- }
- if (getenv("MallocGuardEdges")) {
- malloc_debug_flags |= SCALABLE_MALLOC_ADD_GUARD_PAGES;
- _malloc_printf(ASL_LEVEL_INFO, "protecting edges\n");
- if (getenv("MallocDoNotProtectPrelude")) {
- malloc_debug_flags |= SCALABLE_MALLOC_DONT_PROTECT_PRELUDE;
- _malloc_printf(ASL_LEVEL_INFO, "... but not protecting prelude guard page\n");
- }
- if (getenv("MallocDoNotProtectPostlude")) {
- malloc_debug_flags |= SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE;
- _malloc_printf(ASL_LEVEL_INFO, "... but not protecting postlude guard page\n");
- }
- }
- flag = getenv("MallocStackLogging");
- if (!flag) {
- flag = getenv("MallocStackLoggingNoCompact");
- stack_logging_dontcompact = 1;
- }
- // For debugging, the MallocStackLogging or MallocStackLoggingNoCompact environment variables can be set to
- // values of "memory", "disk", or "both" to control which stack logging mechanism to use. Those strings appear
- // in the flag variable, and the strtoul() call below will return 0, so then we can do string comparison on the
- // value of flag. The default stack logging now is disk stack logging, since memory stack logging is not 64-bit-aware.
- if (flag) {
- unsigned long val = strtoul(flag, NULL, 0);
- if (val == 1) val = 0;
- if (val == -1) val = 0;
- if (val) {
- malloc_logger = (void *)val;
- _malloc_printf(ASL_LEVEL_INFO, "recording stacks using recorder %p\n", malloc_logger);
- } else if (strcmp(flag,"memory") == 0) {
- malloc_logger = (malloc_logger_t *)stack_logging_log_stack;
- _malloc_printf(ASL_LEVEL_INFO, "recording malloc stacks in memory using standard recorder\n");
- } else if (strcmp(flag,"both") == 0) {
- malloc_logger = stack_logging_log_stack_debug;
- _malloc_printf(ASL_LEVEL_INFO, "recording malloc stacks to both memory and disk for comparison debugging\n");
- } else { // the default is to log to disk
- malloc_logger = __disk_stack_logging_log_stack;
- _malloc_printf(ASL_LEVEL_INFO, "recording malloc stacks to disk using standard recorder\n");
- }
- stack_logging_enable_logging = 1;
- if (stack_logging_dontcompact) {
- if (malloc_logger == __disk_stack_logging_log_stack) {
- _malloc_printf(ASL_LEVEL_INFO, "stack logging compaction turned off; size of log files on disk can increase rapidly\n");
- } else {
- _malloc_printf(ASL_LEVEL_INFO, "stack logging compaction turned off; VM can increase rapidly\n");
- }
- }
- }
- if (getenv("MallocScribble")) {
- malloc_debug_flags |= SCALABLE_MALLOC_DO_SCRIBBLE;
- _malloc_printf(ASL_LEVEL_INFO, "enabling scribbling to detect mods to free blocks\n");
- }
- if (getenv("MallocErrorAbort")) {
- malloc_debug_flags |= SCALABLE_MALLOC_ABORT_ON_ERROR;
- _malloc_printf(ASL_LEVEL_INFO, "enabling abort() on bad malloc or free\n");
- }
-#if __LP64__
- /* initialization above forces SCALABLE_MALLOC_ABORT_ON_CORRUPTION of 64-bit processes */
-#else
- flag = getenv("MallocCorruptionAbort");
- if (flag && (flag[0] == '0')) { // Set from an environment variable in 32-bit processes
- malloc_debug_flags &= ~SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
- } else if (flag) {
- malloc_debug_flags |= SCALABLE_MALLOC_ABORT_ON_CORRUPTION;
- }
-#endif
- flag = getenv("MallocCheckHeapStart");
- if (flag) {
- malloc_check_start = strtoul(flag, NULL, 0);
- if (malloc_check_start == 0) malloc_check_start = 1;
- if (malloc_check_start == -1) malloc_check_start = 1;
- flag = getenv("MallocCheckHeapEach");
- if (flag) {
- malloc_check_each = strtoul(flag, NULL, 0);
- if (malloc_check_each == 0) malloc_check_each = 1;
- if (malloc_check_each == -1) malloc_check_each = 1;
- }
- _malloc_printf(ASL_LEVEL_INFO, "checks heap after %dth operation and each %d operations\n", malloc_check_start, malloc_check_each);
- flag = getenv("MallocCheckHeapAbort");
- if (flag)
- malloc_check_abort = strtol(flag, NULL, 0);
- if (malloc_check_abort)
- _malloc_printf(ASL_LEVEL_INFO, "will abort on heap corruption\n");
- else {
- flag = getenv("MallocCheckHeapSleep");
- if (flag)
- malloc_check_sleep = strtol(flag, NULL, 0);
- if (malloc_check_sleep > 0)
- _malloc_printf(ASL_LEVEL_INFO, "will sleep for %d seconds on heap corruption\n", malloc_check_sleep);
- else if (malloc_check_sleep < 0)
- _malloc_printf(ASL_LEVEL_INFO, "will sleep once for %d seconds on heap corruption\n", -malloc_check_sleep);
- else
- _malloc_printf(ASL_LEVEL_INFO, "no sleep on heap corruption\n");
- }
- }
- if (getenv("MallocHelp")) {
- _malloc_printf(ASL_LEVEL_INFO,
- "environment variables that can be set for debug:\n"
- "- MallocLogFile <f> to create/append messages to file <f> instead of stderr\n"
- "- MallocGuardEdges to add 2 guard pages for each large block\n"
- "- MallocDoNotProtectPrelude to disable protection (when previous flag set)\n"
- "- MallocDoNotProtectPostlude to disable protection (when previous flag set)\n"
- "- MallocStackLogging to record all stacks. Tools like leaks can then be applied\n"
- "- MallocStackLoggingNoCompact to record all stacks. Needed for malloc_history\n"
- "- MallocStackLoggingDirectory to set location of stack logs, which can grow large; default is /tmp\n"
- "- MallocScribble to detect writing on free blocks and missing initializers:\n"
- " 0x55 is written upon free and 0xaa is written on allocation\n"
- "- MallocCheckHeapStart <n> to start checking the heap after <n> operations\n"
- "- MallocCheckHeapEach <s> to repeat the checking of the heap after <s> operations\n"
- "- MallocCheckHeapSleep <t> to sleep <t> seconds on heap corruption\n"
- "- MallocCheckHeapAbort <b> to abort on heap corruption if <b> is non-zero\n"
- "- MallocCorruptionAbort to abort on malloc errors, but not on out of memory for 32-bit processes\n"
- " MallocCorruptionAbort is always set on 64-bit processes\n"
- "- MallocErrorAbort to abort on any malloc error, including out of memory\n"
- "- MallocHelp - this help!\n");
- }
-}
-
-malloc_zone_t *
-malloc_create_zone(vm_size_t start_size, unsigned flags)
-{
- malloc_zone_t *zone;
-
- /* start_size doesn't seemed to actually be used, but we test anyways */
- if (start_size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- if (malloc_def_zone_state < 2) _malloc_initialize();
- zone = create_scalable_zone(start_size, flags | malloc_debug_flags);
- malloc_zone_register(zone);
- return zone;
-}
-
-/*
- * For use by CheckFix: establish a new default zone whose behavior is, apart from
- * the use of death-row and per-CPU magazines, that of Leopard.
- */
-void
-malloc_create_legacy_default_zone(void)
-{
- malloc_zone_t *zone;
- int i;
-
- if (malloc_def_zone_state < 2) _malloc_initialize();
- zone = create_legacy_scalable_zone(0, malloc_debug_flags);
-
- MALLOC_LOCK();
- malloc_zone_register_while_locked(zone);
-
- //
- // Establish the legacy scalable zone just created as the default zone.
- //
- malloc_zone_t *hold = malloc_zones[0];
- if(hold->zone_name && strcmp(hold->zone_name, "DefaultMallocZone") == 0) {
- malloc_set_zone_name(hold, NULL);
- }
- malloc_set_zone_name(zone, "DefaultMallocZone");
-
- unsigned protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
- mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
-
- // assert(zone == malloc_zones[malloc_num_zones - 1];
- for (i = malloc_num_zones - 1; i > 0; --i) {
- malloc_zones[i] = malloc_zones[i - 1];
- }
- malloc_zones[0] = zone;
-
- mprotect(malloc_zones, protect_size, PROT_READ);
- MALLOC_UNLOCK();
-}
-
-void
-malloc_destroy_zone(malloc_zone_t *zone) {
- malloc_set_zone_name(zone, NULL); // Deallocate zone name wherever it may reside PR_7701095
- malloc_zone_unregister(zone);
- zone->destroy(zone);
-}
-
-/********* Block creation and manipulation ************/
-
-static void
-internal_check(void) {
- static vm_address_t *frames = NULL;
- static unsigned num_frames;
- if (malloc_zone_check(NULL)) {
- if (!frames) vm_allocate(mach_task_self(), (void *)&frames, vm_page_size, 1);
- thread_stack_pcs(frames, vm_page_size/sizeof(vm_address_t) - 1, &num_frames);
- } else {
- _SIMPLE_STRING b = _simple_salloc();
- if (b)
- _simple_sprintf(b, "*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter-1);
- else
- _malloc_printf(MALLOC_PRINTF_NOLOG, "*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter-1);
- malloc_printf("*** MallocCheckHeap: FAILED check at %dth operation\n", malloc_check_counter-1);
- if (frames) {
- unsigned index = 1;
- if (b) {
- _simple_sappend(b, "Stack for last operation where the malloc check succeeded: ");
- while (index < num_frames) _simple_sprintf(b, "%p ", frames[index++]);
- malloc_printf("%s\n(Use 'atos' for a symbolic stack)\n", _simple_string(b));
- } else {
- /*
- * Should only get here if vm_allocate() can't get a single page of
- * memory, implying _simple_asl_log() would also fail. So we just
- * print to the file descriptor.
- */
- _malloc_printf(MALLOC_PRINTF_NOLOG, "Stack for last operation where the malloc check succeeded: ");
- while (index < num_frames) _malloc_printf(MALLOC_PRINTF_NOLOG, "%p ", frames[index++]);
- _malloc_printf(MALLOC_PRINTF_NOLOG, "\n(Use 'atos' for a symbolic stack)\n");
- }
- }
- if (malloc_check_each > 1) {
- unsigned recomm_each = (malloc_check_each > 10) ? malloc_check_each/10 : 1;
- unsigned recomm_start = (malloc_check_counter > malloc_check_each+1) ? malloc_check_counter-1-malloc_check_each : 1;
- malloc_printf("*** Recommend using 'setenv MallocCheckHeapStart %d; setenv MallocCheckHeapEach %d' to narrow down failure\n", recomm_start, recomm_each);
- }
- if (malloc_check_abort) {
- CRSetCrashLogMessage(b ? _simple_string(b) : "*** MallocCheckHeap: FAILED check");
- abort();
- } else if (b)
- _simple_sfree(b);
- if (malloc_check_sleep > 0) {
- _malloc_printf(ASL_LEVEL_NOTICE, "*** Sleeping for %d seconds to leave time to attach\n",
- malloc_check_sleep);
- sleep(malloc_check_sleep);
- } else if (malloc_check_sleep < 0) {
- _malloc_printf(ASL_LEVEL_NOTICE, "*** Sleeping once for %d seconds to leave time to attach\n",
- -malloc_check_sleep);
- sleep(-malloc_check_sleep);
- malloc_check_sleep = 0;
- }
- }
- malloc_check_start += malloc_check_each;
-}
-
-void *
-malloc_zone_malloc(malloc_zone_t *zone, size_t size) {
- void *ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- ptr = zone->malloc(zone, size);
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
- return ptr;
-}
-
-void *
-malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size) {
- void *ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- ptr = zone->calloc(zone, num_items, size);
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE | MALLOC_LOG_TYPE_CLEARED, (uintptr_t)zone, (uintptr_t)(num_items * size), 0,
- (uintptr_t)ptr, 0);
- return ptr;
-}
-
-void *
-malloc_zone_valloc(malloc_zone_t *zone, size_t size) {
- void *ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- ptr = zone->valloc(zone, size);
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
- return ptr;
-}
-
-void *
-malloc_zone_realloc(malloc_zone_t *zone, void *ptr, size_t size) {
- void *new_ptr;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- new_ptr = zone->realloc(zone, ptr, size);
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)ptr, (uintptr_t)size,
- (uintptr_t)new_ptr, 0);
- return new_ptr;
-}
-
-void
-malloc_zone_free(malloc_zone_t *zone, void *ptr) {
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)ptr, 0, 0, 0);
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- zone->free(zone, ptr);
-}
-
-static void
-malloc_zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size) {
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)ptr, 0, 0, 0);
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- zone->free_definite_size(zone, ptr, size);
-}
-
-malloc_zone_t *
-malloc_zone_from_ptr(const void *ptr) {
- if (!ptr)
- return NULL;
- else
- return find_registered_zone(ptr, NULL);
-}
-
-void *
-malloc_zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size) {
- void *ptr;
- if (zone->version < 5) // Version must be >= 5 to look at the new memalign field.
- return NULL;
- if (!(zone->memalign))
- return NULL;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (size > MALLOC_ABSOLUTE_MAX_SIZE) {
- return NULL;
- }
- if (alignment < sizeof( void *) || // excludes 0 == alignment
- 0 != (alignment & (alignment - 1))) { // relies on sizeof(void *) being a power of two.
- return NULL;
- }
- ptr = zone->memalign(zone, alignment, size);
- if (malloc_logger)
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)ptr, 0);
- return ptr;
-}
-
-/********* Functions for zone implementors ************/
-
-void
-malloc_zone_register(malloc_zone_t *zone) {
- MALLOC_LOCK();
- malloc_zone_register_while_locked(zone);
- MALLOC_UNLOCK();
-}
-
-void
-malloc_zone_unregister(malloc_zone_t *z) {
- unsigned index;
-
- if (malloc_num_zones == 0)
- return;
-
- MALLOC_LOCK();
- for (index = 0; index < malloc_num_zones; ++index) {
- if (z != malloc_zones[index])
- continue;
-
- // Modify the page to be allow write access, so that we can update the
- // malloc_zones array.
- size_t protect_size = malloc_num_zones_allocated * sizeof(malloc_zone_t *);
- mprotect(malloc_zones, protect_size, PROT_READ | PROT_WRITE);
-
- // If we found a match, replace it with the entry at the end of the list, shrink the list,
- // and leave the end of the list intact to avoid racing with find_registered_zone().
-
- malloc_zones[index] = malloc_zones[malloc_num_zones - 1];
- --malloc_num_zones;
-
- mprotect(malloc_zones, protect_size, PROT_READ);
-
- // Exchange the roles of the FRZ counters. The counter that has captured the number of threads presently
- // executing *inside* find_regiatered_zone is swapped with the counter drained to zero last time through.
- // The former is then allowed to drain to zero while this thread yields.
- int *p = pFRZCounterLive;
- pFRZCounterLive = pFRZCounterDrain;
- pFRZCounterDrain = p;
- __sync_synchronize(); // Full memory barrier
-
- while (0 != *pFRZCounterDrain) { pthread_yield_np(); }
-
- MALLOC_UNLOCK();
-
- return;
- }
- MALLOC_UNLOCK();
- malloc_printf("*** malloc_zone_unregister() failed for %p\n", z);
-}
-
-void
-malloc_set_zone_name(malloc_zone_t *z, const char *name) {
- char *newName;
-
- mprotect(z, sizeof(malloc_zone_t), PROT_READ | PROT_WRITE);
- if (z->zone_name) {
- free((char *)z->zone_name);
- z->zone_name = NULL;
- }
- if (name) {
- size_t buflen = strlen(name) + 1;
- newName = malloc_zone_malloc(z, buflen);
- if (newName) {
- strlcpy(newName, name, buflen);
- z->zone_name = (const char *)newName;
- } else {
- z->zone_name = NULL;
- }
- }
- mprotect(z, sizeof(malloc_zone_t), PROT_READ);
-}
-
-const char *
-malloc_get_zone_name(malloc_zone_t *zone) {
- return zone->zone_name;
-}
-
-/*
- * XXX malloc_printf now uses _simple_*printf. It only deals with a
- * subset of printf format specifiers, but it doesn't call malloc.
- */
-
-__private_extern__ void
-_malloc_vprintf(int flags, const char *format, va_list ap)
-{
- _SIMPLE_STRING b;
-
- if (_malloc_no_asl_log || (flags & MALLOC_PRINTF_NOLOG) || (b = _simple_salloc()) == NULL) {
- if (!(flags & MALLOC_PRINTF_NOPREFIX)) {
- if (__is_threaded) {
- /* XXX somewhat rude 'knowing' that pthread_t is a pointer */
- _simple_dprintf(malloc_debug_file, "%s(%d,%p) malloc: ", getprogname(), getpid(), (void *)pthread_self());
- } else {
- _simple_dprintf(malloc_debug_file, "%s(%d) malloc: ", getprogname(), getpid());
- }
- }
- _simple_vdprintf(malloc_debug_file, format, ap);
- return;
- }
- if (!(flags & MALLOC_PRINTF_NOPREFIX)) {
- if (__is_threaded) {
- /* XXX somewhat rude 'knowing' that pthread_t is a pointer */
- _simple_sprintf(b, "%s(%d,%p) malloc: ", getprogname(), getpid(), (void *)pthread_self());
- } else {
- _simple_sprintf(b, "%s(%d) malloc: ", getprogname(), getpid());
- }
- }
- _simple_vsprintf(b, format, ap);
- _simple_put(b, malloc_debug_file);
- _simple_asl_log(flags & MALLOC_PRINTF_LEVEL_MASK, Malloc_Facility, _simple_string(b));
- _simple_sfree(b);
-}
-
-__private_extern__ void
-_malloc_printf(int flags, const char *format, ...)
-{
- va_list ap;
-
- va_start(ap, format);
- _malloc_vprintf(flags, format, ap);
- va_end(ap);
-}
-
-void
-malloc_printf(const char *format, ...)
-{
- va_list ap;
-
- va_start(ap, format);
- _malloc_vprintf(ASL_LEVEL_ERR, format, ap);
- va_end(ap);
-}
-
-/********* Generic ANSI callouts ************/
-
-void *
-malloc(size_t size) {
- void *retval;
- retval = malloc_zone_malloc(inline_malloc_default_zone(), size);
- if (retval == NULL) {
- errno = ENOMEM;
- }
- return retval;
-}
-
-void *
-calloc(size_t num_items, size_t size) {
- void *retval;
- retval = malloc_zone_calloc(inline_malloc_default_zone(), num_items, size);
- if (retval == NULL) {
- errno = ENOMEM;
- }
- return retval;
-}
-
-void
-free(void *ptr) {
- malloc_zone_t *zone;
- size_t size;
- if (!ptr)
- return;
- zone = find_registered_zone(ptr, &size);
- if (!zone) {
- malloc_printf("*** error for object %p: pointer being freed was not allocated\n"
- "*** set a breakpoint in malloc_error_break to debug\n", ptr);
- malloc_error_break();
- if ((malloc_debug_flags & (SCALABLE_MALLOC_ABORT_ON_CORRUPTION|SCALABLE_MALLOC_ABORT_ON_ERROR))) {
- _SIMPLE_STRING b = _simple_salloc();
- if (b) {
- _simple_sprintf(b, "*** error for object %p: pointer being freed was not allocated\n", ptr);
- CRSetCrashLogMessage(_simple_string(b));
- } else {
- CRSetCrashLogMessage("*** error: pointer being freed was not allocated\n");
- }
- abort();
- }
- } else if (zone->version >= 6 && zone->free_definite_size)
- malloc_zone_free_definite_size(zone, ptr, size);
- else
- malloc_zone_free(zone, ptr);
-}
-
-void *
-realloc(void *in_ptr, size_t new_size) {
- void *retval = NULL;
- void *old_ptr;
- malloc_zone_t *zone;
- size_t old_size = 0;
-
- // SUSv3: "If size is 0 and ptr is not a null pointer, the object
- // pointed to is freed. If the space cannot be allocated, the object
- // shall remain unchanged." Also "If size is 0, either a null pointer
- // or a unique pointer that can be successfully passed to free() shall
- // be returned." We choose to allocate a minimum size object by calling
- // malloc_zone_malloc with zero size, which matches "If ptr is a null
- // pointer, realloc() shall be equivalent to malloc() for the specified
- // size." So we only free the original memory if the allocation succeeds.
- old_ptr = (new_size == 0) ? NULL : in_ptr;
- if (!old_ptr) {
- retval = malloc_zone_malloc(inline_malloc_default_zone(), new_size);
- } else {
- zone = find_registered_zone(old_ptr, &old_size);
- if (!zone) {
- malloc_printf("*** error for object %p: pointer being realloc'd was not allocated\n"
- "*** set a breakpoint in malloc_error_break to debug\n", old_ptr);
- malloc_error_break();
- if ((malloc_debug_flags & (SCALABLE_MALLOC_ABORT_ON_CORRUPTION|SCALABLE_MALLOC_ABORT_ON_ERROR))) {
- _SIMPLE_STRING b = _simple_salloc();
- if (b) {
- _simple_sprintf(b, "*** error for object %p: pointer being realloc'd was not allocated\n", old_ptr);
- CRSetCrashLogMessage(_simple_string(b));
- } else {
- CRSetCrashLogMessage("*** error: pointer being realloc'd was not allocated\n");
- }
- abort();
- }
- } else {
- retval = malloc_zone_realloc(zone, old_ptr, new_size);
- }
- }
- if (retval == NULL) {
- errno = ENOMEM;
- } else if (new_size == 0) {
- free(in_ptr);
- }
- return retval;
-}
-
-void *
-valloc(size_t size) {
- void *retval;
- malloc_zone_t *zone = inline_malloc_default_zone();
- retval = malloc_zone_valloc(zone, size);
- if (retval == NULL) {
- errno = ENOMEM;
- }
- return retval;
-}
-
-extern void
-vfree(void *ptr) {
- free(ptr);
-}
-
-size_t
-malloc_size(const void *ptr) {
- size_t size = 0;
-
- if (!ptr)
- return size;
-
- (void)find_registered_zone(ptr, &size);
- return size;
-}
-
-size_t
-malloc_good_size (size_t size) {
- malloc_zone_t *zone = inline_malloc_default_zone();
- return zone->introspect->good_size(zone, size);
-}
-
-/*
- * The posix_memalign() function shall allocate size bytes aligned on a boundary specified by alignment,
- * and shall return a pointer to the allocated memory in memptr.
- * The value of alignment shall be a multiple of sizeof( void *), that is also a power of two.
- * Upon successful completion, the value pointed to by memptr shall be a multiple of alignment.
- *
- * Upon successful completion, posix_memalign() shall return zero; otherwise,
- * an error number shall be returned to indicate the error.
- *
- * The posix_memalign() function shall fail if:
- * EINVAL
- * The value of the alignment parameter is not a power of two multiple of sizeof( void *).
- * ENOMEM
- * There is insufficient memory available with the requested alignment.
- */
-
-int
-posix_memalign(void **memptr, size_t alignment, size_t size)
-{
- void *retval;
-
- /* POSIX is silent on NULL == memptr !?! */
-
- retval = malloc_zone_memalign(inline_malloc_default_zone(), alignment, size);
- if (retval == NULL) {
- // To avoid testing the alignment constraints redundantly, we'll rely on the
- // test made in malloc_zone_memalign to vet each request. Only if that test fails
- // and returns NULL, do we arrive here to detect the bogus alignment and give the
- // required EINVAL return.
- if (alignment < sizeof( void *) || // excludes 0 == alignment
- 0 != (alignment & (alignment - 1))) { // relies on sizeof(void *) being a power of two.
- return EINVAL;
- }
- return ENOMEM;
- } else {
- *memptr = retval; // Set iff allocation succeeded
- return 0;
- }
-}
-
-static malloc_zone_t *
-find_registered_purgeable_zone(void *ptr) {
- if (!ptr)
- return NULL;
-
- /*
- * Look for a zone which contains ptr. If that zone does not have the purgeable malloc flag
- * set, or the allocation is too small, do nothing. Otherwise, set the allocation volatile.
- * FIXME: for performance reasons, we should probably keep a separate list of purgeable zones
- * and only search those.
- */
- size_t size = 0;
- malloc_zone_t *zone = find_registered_zone(ptr, &size);
-
- /* FIXME: would really like a zone->introspect->flags->purgeable check, but haven't determined
- * binary compatibility impact of changing the introspect struct yet. */
- if (!zone)
- return NULL;
-
- /* Check to make sure pointer is page aligned and size is multiple of page size */
- if ((size < vm_page_size) || ((size % vm_page_size) != 0))
- return NULL;
-
- return zone;
-}
-
-void
-malloc_make_purgeable(void *ptr) {
- malloc_zone_t *zone = find_registered_purgeable_zone(ptr);
- if (!zone)
- return;
-
- int state = VM_PURGABLE_VOLATILE;
- vm_purgable_control(mach_task_self(), (vm_address_t)ptr, VM_PURGABLE_SET_STATE, &state);
- return;
-}
-
-/* Returns true if ptr is valid. Ignore the return value from vm_purgeable_control and only report
- * state. */
-int
-malloc_make_nonpurgeable(void *ptr) {
- malloc_zone_t *zone = find_registered_purgeable_zone(ptr);
- if (!zone)
- return 0;
-
- int state = VM_PURGABLE_NONVOLATILE;
- vm_purgable_control(mach_task_self(), (vm_address_t)ptr, VM_PURGABLE_SET_STATE, &state);
-
- if (state == VM_PURGABLE_EMPTY)
- return EFAULT;
-
- return 0;
-}
-
-size_t malloc_zone_pressure_relief(malloc_zone_t *zone, size_t goal)
-{
- if (!zone) {
- unsigned index = 0;
- size_t total = 0;
-
- // Take lock to defend against malloc_destroy_zone()
- MALLOC_LOCK();
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- if (zone->version < 8)
- continue;
- if (NULL == zone->pressure_relief)
- continue;
- if (0 == goal) /* Greedy */
- total += zone->pressure_relief(zone, 0);
- else if (goal > total)
- total += zone->pressure_relief(zone, goal - total);
- else /* total >= goal */
- break;
- }
- MALLOC_UNLOCK();
- return total;
- } else {
- // Assumes zone is not destroyed for the duration of this call
- if (zone->version < 8)
- return 0;
- if (NULL == zone->pressure_relief)
- return 0;
- return zone->pressure_relief(zone, goal);
- }
-}
-
-/********* Batch methods ************/
-
-unsigned
-malloc_zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results, unsigned num_requested) {
- unsigned (*batch_malloc)(malloc_zone_t *, size_t, void **, unsigned) = zone-> batch_malloc;
- if (! batch_malloc)
- return 0;
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- unsigned batched = batch_malloc(zone, size, results, num_requested);
- if (malloc_logger) {
- unsigned index = 0;
- while (index < batched) {
- malloc_logger(MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)size, 0, (uintptr_t)results[index], 0);
- index++;
- }
- }
- return batched;
-}
-
-void
-malloc_zone_batch_free(malloc_zone_t *zone, void **to_be_freed, unsigned num) {
- if (malloc_check_start && (malloc_check_counter++ >= malloc_check_start)) {
- internal_check();
- }
- if (malloc_logger) {
- unsigned index = 0;
- while (index < num) {
- malloc_logger(MALLOC_LOG_TYPE_DEALLOCATE | MALLOC_LOG_TYPE_HAS_ZONE, (uintptr_t)zone, (uintptr_t)to_be_freed[index], 0, 0, 0);
- index++;
- }
- }
- void (*batch_free)(malloc_zone_t *, void **, unsigned) = zone-> batch_free;
- if (batch_free) {
- batch_free(zone, to_be_freed, num);
- } else {
- void (*free_fun)(malloc_zone_t *, void *) = zone->free;
- while (num--) {
- void *ptr = *to_be_freed++;
- free_fun(zone, ptr);
- }
- }
-}
-
-/********* Functions for performance tools ************/
-
-static kern_return_t
-_malloc_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr) {
- *ptr = (void *)address;
- return 0;
-}
-
-kern_return_t
-malloc_get_all_zones(task_t task, memory_reader_t reader, vm_address_t **addresses, unsigned *count) {
- // Note that the 2 following addresses are not correct if the address of the target is different from your own. This notably occurs if the address of System.framework is slid (e.g. different than at B & I )
- vm_address_t remote_malloc_zones = (vm_address_t)&malloc_zones;
- vm_address_t remote_malloc_num_zones = (vm_address_t)&malloc_num_zones;
- kern_return_t err;
- vm_address_t zones_address;
- vm_address_t *zones_address_ref;
- unsigned num_zones;
- unsigned *num_zones_ref;
- if (!reader) reader = _malloc_default_reader;
- // printf("Read malloc_zones at address %p should be %p\n", &malloc_zones, malloc_zones);
- err = reader(task, remote_malloc_zones, sizeof(void *), (void **)&zones_address_ref);
- // printf("Read malloc_zones[%p]=%p\n", remote_malloc_zones, *zones_address_ref);
- if (err) {
- malloc_printf("*** malloc_get_all_zones: error reading zones_address at %p\n", (unsigned)remote_malloc_zones);
- return err;
- }
- zones_address = *zones_address_ref;
- // printf("Reading num_zones at address %p\n", remote_malloc_num_zones);
- err = reader(task, remote_malloc_num_zones, sizeof(unsigned), (void **)&num_zones_ref);
- if (err) {
- malloc_printf("*** malloc_get_all_zones: error reading num_zones at %p\n", (unsigned)remote_malloc_num_zones);
- return err;
- }
- num_zones = *num_zones_ref;
- // printf("Read malloc_num_zones[%p]=%d\n", remote_malloc_num_zones, num_zones);
- *count = num_zones;
- // printf("malloc_get_all_zones succesfully found %d zones\n", num_zones);
- err = reader(task, zones_address, sizeof(malloc_zone_t *) * num_zones, (void **)addresses);
- if (err) {
- malloc_printf("*** malloc_get_all_zones: error reading zones at %p\n", &zones_address);
- return err;
- }
- // printf("malloc_get_all_zones succesfully read %d zones\n", num_zones);
- return err;
-}
-
-/********* Debug helpers ************/
-
-void
-malloc_zone_print_ptr_info(void *ptr) {
- malloc_zone_t *zone;
- if (!ptr) return;
- zone = malloc_zone_from_ptr(ptr);
- if (zone) {
- printf("ptr %p in registered zone %p\n", ptr, zone);
- } else {
- printf("ptr %p not in heap\n", ptr);
- }
-}
-
-boolean_t
-malloc_zone_check(malloc_zone_t *zone) {
- boolean_t ok = 1;
- if (!zone) {
- unsigned index = 0;
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- if (!zone->introspect->check(zone)) ok = 0;
- }
- } else {
- ok = zone->introspect->check(zone);
- }
- return ok;
-}
-
-void
-malloc_zone_print(malloc_zone_t *zone, boolean_t verbose) {
- if (!zone) {
- unsigned index = 0;
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- zone->introspect->print(zone, verbose);
- }
- } else {
- zone->introspect->print(zone, verbose);
- }
-}
-
-void
-malloc_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats) {
- if (!zone) {
- memset(stats, 0, sizeof(*stats));
- unsigned index = 0;
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- malloc_statistics_t this_stats;
- zone->introspect->statistics(zone, &this_stats);
- stats->blocks_in_use += this_stats.blocks_in_use;
- stats->size_in_use += this_stats.size_in_use;
- stats->max_size_in_use += this_stats.max_size_in_use;
- stats->size_allocated += this_stats.size_allocated;
- }
- } else {
- zone->introspect->statistics(zone, stats);
- }
-}
-
-void
-malloc_zone_log(malloc_zone_t *zone, void *address) {
- if (!zone) {
- unsigned index = 0;
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- zone->introspect->log(zone, address);
- }
- } else {
- zone->introspect->log(zone, address);
- }
-}
-
-/********* Misc other entry points ************/
-
-static void
-DefaultMallocError(int x) {
-#if USE_SLEEP_RATHER_THAN_ABORT
- malloc_printf("*** error %d\n", x);
- sleep(3600);
-#else
- _SIMPLE_STRING b = _simple_salloc();
- if (b) {
- _simple_sprintf(b, "*** error %d", x);
- malloc_printf("%s\n", _simple_string(b));
- CRSetCrashLogMessage(_simple_string(b));
- } else {
- _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error %d", x);
- CRSetCrashLogMessage("*** DefaultMallocError called");
- }
- abort();
-#endif
-}
-
-void (*
-malloc_error(void (*func)(int)))(int) {
- return DefaultMallocError;
-}
-
-/* Stack logging fork-handling prototypes */
-extern void __stack_logging_fork_prepare();
-extern void __stack_logging_fork_parent();
-extern void __stack_logging_fork_child();
-extern void __stack_logging_early_finished();
-
-void
-_malloc_fork_prepare() {
- /* Prepare the malloc module for a fork by insuring that no thread is in a malloc critical section */
- unsigned index = 0;
- MALLOC_LOCK();
- while (index < malloc_num_zones) {
- malloc_zone_t *zone = malloc_zones[index++];
- zone->introspect->force_lock(zone);
- }
- __stack_logging_fork_prepare();
-}
-
-void
-_malloc_fork_parent() {
- /* Called in the parent process after a fork() to resume normal operation. */
- unsigned index = 0;
- __stack_logging_fork_parent();
- MALLOC_UNLOCK();
- while (index < malloc_num_zones) {
- malloc_zone_t *zone = malloc_zones[index++];
- zone->introspect->force_unlock(zone);
- }
-}
-
-void
-_malloc_fork_child() {
- /* Called in the child process after a fork() to resume normal operation. In the MTASK case we also have to change memory inheritance so that the child does not share memory with the parent. */
- unsigned index = 0;
- __stack_logging_fork_child();
- MALLOC_UNLOCK();
- while (index < malloc_num_zones) {
- malloc_zone_t *zone = malloc_zones[index++];
- zone->introspect->force_unlock(zone);
- }
-}
-
-/*
- * A Glibc-like mstats() interface.
- *
- * Note that this interface really isn't very good, as it doesn't understand
- * that we may have multiple allocators running at once. We just massage
- * the result from malloc_zone_statistics in any case.
- */
-struct mstats
-mstats(void)
-{
- malloc_statistics_t s;
- struct mstats m;
-
- malloc_zone_statistics(NULL, &s);
- m.bytes_total = s.size_allocated;
- m.chunks_used = s.blocks_in_use;
- m.bytes_used = s.size_in_use;
- m.chunks_free = 0;
- m.bytes_free = m.bytes_total - m.bytes_used; /* isn't this somewhat obvious? */
-
- return(m);
-}
-
-boolean_t
-malloc_zone_enable_discharge_checking(malloc_zone_t *zone)
-{
- if (zone->version < 7) // Version must be >= 7 to look at the new discharge checking fields.
- return FALSE;
- if (NULL == zone->introspect->enable_discharge_checking)
- return FALSE;
- return zone->introspect->enable_discharge_checking(zone);
-}
-
-void
-malloc_zone_disable_discharge_checking(malloc_zone_t *zone)
-{
- if (zone->version < 7) // Version must be >= 7 to look at the new discharge checking fields.
- return;
- if (NULL == zone->introspect->disable_discharge_checking)
- return;
- zone->introspect->disable_discharge_checking(zone);
-}
-
-void
-malloc_zone_discharge(malloc_zone_t *zone, void *memory)
-{
- if (NULL == zone)
- zone = malloc_zone_from_ptr(memory);
- if (NULL == zone)
- return;
- if (zone->version < 7) // Version must be >= 7 to look at the new discharge checking fields.
- return;
- if (NULL == zone->introspect->discharge)
- return;
- zone->introspect->discharge(zone, memory);
-}
-
-void
-malloc_zone_enumerate_discharged_pointers(malloc_zone_t *zone, void (^report_discharged)(void *memory, void *info))
-{
- if (!zone) {
- unsigned index = 0;
- while (index < malloc_num_zones) {
- zone = malloc_zones[index++];
- if (zone->version < 7)
- continue;
- if (NULL == zone->introspect->enumerate_discharged_pointers)
- continue;
- zone->introspect->enumerate_discharged_pointers(zone, report_discharged);
- }
- } else {
- if (zone->version < 7)
- return;
- if (NULL == zone->introspect->enumerate_discharged_pointers)
- return;
- zone->introspect->enumerate_discharged_pointers(zone, report_discharged);
- }
-}
-
-/***************** OBSOLETE ENTRY POINTS ********************/
-
-#if PHASE_OUT_OLD_MALLOC
-#error PHASE OUT THE FOLLOWING FUNCTIONS
-#else
-#warning PHASE OUT THE FOLLOWING FUNCTIONS
-#endif
-
-void
-set_malloc_singlethreaded(boolean_t single) {
- static boolean_t warned = 0;
- if (!warned) {
-#if PHASE_OUT_OLD_MALLOC
- malloc_printf("*** OBSOLETE: set_malloc_singlethreaded(%d)\n", single);
-#endif
- warned = 1;
- }
-}
-
-void
-malloc_singlethreaded() {
- static boolean_t warned = 0;
- if (!warned) {
- malloc_printf("*** OBSOLETE: malloc_singlethreaded()\n");
- warned = 1;
- }
-}
-
-int
-malloc_debug(int level) {
- malloc_printf("*** OBSOLETE: malloc_debug()\n");
- return 0;
-}
projects / apple / libc.git / blobdiff