malloc.h

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/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

#import <stddef.h>
#import <mach/mach.h>

/*********  Type definitions    ************/

typedef struct _malloc_zone_t {
    /* Only zone implementors should depend on the layout of this structure;
    Regular callers should use the access functions below */
    void    *reserved1;
    void    *reserved2;
    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;
    void    *reserved3;
    void    *reserved4;
    struct malloc_introspection_t   *introspect;
    void    *reserved5;
} malloc_zone_t;

/*********  Creation and destruction    ************/

extern malloc_zone_t *malloc_default_zone(void);
    /* The initial zone */

extern malloc_zone_t *malloc_create_zone(vm_size_t start_size, unsigned flags);
    /* Create a new zone */

extern void malloc_destroy_zone(malloc_zone_t *zone);
    /* Destroys zone and everything it allocated */

/*********  Block creation and manipulation ************/

extern void *malloc_zone_malloc(malloc_zone_t *zone, size_t size);
    /* Allocates a new pointer of size size; zone must be non-NULL */

extern void *malloc_zone_calloc(malloc_zone_t *zone, size_t num_items, size_t size);
    /* Allocates a new pointer of size num_items * size; block is cleared; zone must be non-NULL */

extern void *malloc_zone_valloc(malloc_zone_t *zone, size_t size);
    /* Allocates a new pointer of size size; zone must be non-NULL; Pointer is guaranteed to be page-aligned and block is cleared */

extern void malloc_zone_free(malloc_zone_t *zone, void *ptr);
    /* Frees pointer in zone; zone must be non-NULL */

extern void *malloc_zone_realloc(malloc_zone_t *zone, void *ptr, size_t size);
    /* Enlarges block if necessary; zone must be non-NULL */

extern malloc_zone_t *malloc_zone_from_ptr(const void *ptr);
    /* Returns the zone for a pointer, or NULL if not in any zone.
    The ptr must have been returned from a malloc or realloc call. */

extern size_t malloc_size(const void *ptr);
    /* Returns size of given ptr */

/*********  Functions for zone implementors ************/

extern void malloc_zone_register(malloc_zone_t *zone);
    /* Registers a freshly created zone;
    Should typically be called after a zone has been created */

extern void malloc_zone_unregister(malloc_zone_t *zone);
    /* De-registers a zone
    Should typically be called before calling the zone destruction routine */

extern void malloc_set_zone_name(malloc_zone_t *zone, const char *name);
    /* Sets the name of a zone */

extern const char *malloc_get_zone_name(malloc_zone_t *zone);
    /* Returns the name of a zone */

typedef struct {
    vm_address_t    address;
    vm_size_t       size;
} vm_range_t;

typedef kern_return_t memory_reader_t(task_t remote_task, vm_address_t remote_address, vm_size_t size, void **local_memory);
    /* given a task, "reads" the memory at the given address and size
local_memory: set to a contiguous chunk of memory; validity of local_memory is assumed to be limited (until next call) */

#define MALLOC_PTR_IN_USE_RANGE_TYPE    1   /* for allocated pointers */
#define MALLOC_PTR_REGION_RANGE_TYPE    2   /* for region containing pointers */
#define MALLOC_ADMIN_REGION_RANGE_TYPE  4   /* for region used internally */

typedef void vm_range_recorder_t(task_t, void *, unsigned type, vm_range_t *, unsigned);
    /* given a task and context, "records" the specified addresses */

typedef struct malloc_introspection_t {
    kern_return_t (*enumerator)(task_t task, void *, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder); /* enumerates all the malloc pointers in use */
    size_t  (*good_size)(malloc_zone_t *zone, size_t size);
    boolean_t   (*check)(malloc_zone_t *zone); /* Consistency checker */
    void    (*print)(malloc_zone_t *zone, boolean_t verbose); /* Prints zone  */
    void    (*log)(malloc_zone_t *zone, void *address); /* Enables logging of activity */
    void    (*force_lock)(malloc_zone_t *zone); /* Forces locking zone */
    void    (*force_unlock)(malloc_zone_t *zone); /* Forces unlocking zone */
} malloc_introspection_t;

extern void malloc_printf(const char *format, ...);
    /* Convenience for logging errors and warnings;
    No allocation is performed during execution of this function;
    Only understand %p %d %x %s formats
    */

/*********  Functions for performance tools ************/

extern kern_return_t malloc_get_all_zones(task_t task, memory_reader_t reader, vm_address_t **addresses, unsigned *count);
    /* Fills addresses and count with the addresses of the zones in task;
    Note that the validity of the addresses returned correspond to the validity of the memory returned by reader */

/*********  Debug helpers   ************/

extern void malloc_zone_print_ptr_info(void *ptr);
    /* print to stdout if this pointer is in the malloc heap, free status, and size */

extern boolean_t malloc_zone_check(malloc_zone_t *zone);
    /* Checks zone is well formed; if !zone, checks all zones */

extern void malloc_zone_print(malloc_zone_t *zone, boolean_t verbose);
    /* Prints summary on zone; if !zone, prints all zones */

extern void malloc_zone_log(malloc_zone_t *zone, void *address);
    /* Controls logging of all activity; if !zone, for all zones;
    If address==0 nothing is logged;
    If address==-1 all activity is logged;
    Else only the activity regarding address is logged */

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