/*
* Copyright (c) 1999 Apple Computer, 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@
*/
#ifndef PARTITION_ALLOC_THIRD_PARTY_APPLE_APSL_MALLOC_H_
#define PARTITION_ALLOC_THIRD_PARTY_APPLE_APSL_MALLOC_H_
#include <mach/boolean.h>
typedef struct _ChromeMallocZone {
/* Only zone implementors should depend on the layout of this structure;
Regular callers should use the access functions below */
void* reserved1; /* RESERVED FOR CFAllocator DO NOT USE */
void* reserved2; /* RESERVED FOR CFAllocator DO NOT USE */
size_t (*size)(
struct _malloc_zone_t* zone,
const void* ptr); /* returns the size of a block or 0 if not in this zone;
must be fast, especially for negative answers */
void* (*malloc)(struct _malloc_zone_t* zone, size_t size);
void* (*calloc)(
struct _malloc_zone_t* zone,
size_t num_items,
size_t size); /* same as malloc, but block returned is set to zero */
void* (*valloc)(struct _malloc_zone_t* zone,
size_t size); /* same as malloc, but block returned is set to
zero and is guaranteed to be page aligned */
void (*free)(struct _malloc_zone_t* zone, void* ptr);
void* (*realloc)(struct _malloc_zone_t* zone, void* ptr, size_t size);
void (*destroy)(struct _malloc_zone_t*
zone); /* zone is destroyed and all memory reclaimed */
const char* zone_name;
/* Optional batch callbacks; these may be NULL */
unsigned (*batch_malloc)(
struct _malloc_zone_t* zone,
size_t size,
void** results,
unsigned
num_requested); /* given a size, returns pointers capable of holding
that size; returns the number of pointers allocated
(maybe 0 or less than num_requested) */
void (*batch_free)(
struct _malloc_zone_t* zone,
void** to_be_freed,
unsigned num_to_be_freed); /* frees all the pointers in to_be_freed; note
that to_be_freed may be overwritten during
the process */
struct malloc_introspection_t* introspect;
unsigned version;
/* aligned memory allocation. The callback may be NULL. Present in version
* >= 5. */
void* (*memalign)(struct _malloc_zone_t* zone, size_t alignment, size_t size);
/* free a pointer known to be in zone and known to have the given size. The
* callback may be NULL. Present in version >= 6.*/
void (*free_definite_size)(struct _malloc_zone_t* zone,
void* ptr,
size_t size);
/* Empty out caches in the face of memory pressure. The callback may be NULL.
* Present in version >= 8. */
size_t (*pressure_relief)(struct _malloc_zone_t* zone, size_t goal);
/*
* Checks whether an address might belong to the zone. May be NULL. Present in
* version >= 10. False positives are allowed (e.g. the pointer was freed, or
* it's in zone space that has not yet been allocated. False negatives are not
* allowed.
*/
boolean_t (*claimed_address)(struct _malloc_zone_t* zone, void* ptr);
/* For zone 0 implementations: try to free ptr, promising to call
* find_zone_and_free if it turns out not to belong to us */
void (*try_free_default)(struct _malloc_zone_t* zone, void* ptr);
} ChromeMallocZone;
/********* Zone version summary ************/
// Version 0, but optional:
// malloc_zone_t::batch_malloc
// malloc_zone_t::batch_free
// Version 5:
// malloc_zone_t::memalign
// Version 6:
// malloc_zone_t::free_definite_size
// Version 7:
// malloc_introspection_t::enable_discharge_checking
// malloc_introspection_t::disable_discharge_checking
// malloc_introspection_t::discharge
// Version 8:
// malloc_zone_t::pressure_relief
// Version 9:
// malloc_introspection_t::reinit_lock
// Version 10:
// malloc_zone_t::claimed_address
// Version 11:
// malloc_introspection_t::print_task
// Version 12:
// malloc_introspection_t::task_statistics
// Version 13:
// - malloc_zone_t::malloc and malloc_zone_t::calloc assume responsibility for
// setting errno to ENOMEM on failure
// - malloc_zone_t::try_free_default
// These functions are optional and calling them requires two checks:
// * Check zone version to ensure zone struct is large enough to include the
// member.
// * Check that the function pointer is not null.
#endif // PARTITION_ALLOC_THIRD_PARTY_APPLE_APSL_MALLOC_H_
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