gen/stack_logging.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #import <malloc/malloc.h>
  25
  26 #define stack_logging_type_free 0
  27 #define stack_logging_type_generic      1       /* anything that is not allocation/deallocation */
  28 #define stack_logging_type_alloc        2       /* malloc, realloc, etc... */
  29 #define stack_logging_type_dealloc      4       /* free, realloc, etc... */
  30
  31 // Following flags are absorbed by stack_logging_log_stack()
  32 #define stack_logging_flag_zone         8       /* NSZoneMalloc, etc... */
  33 #define stack_logging_flag_calloc       16      /* multiply arguments to get the size */
  34 #define stack_logging_flag_object       32      /* NSAllocateObject(Class, extraBytes, zone) */
  35 #define stack_logging_flag_cleared      64      /* for NewEmptyHandle */
  36 #define stack_logging_flag_handle       128     /* for Handle (de-)allocation routines */
  37 #define stack_logging_flag_set_handle_size      256     /* (Handle, newSize) treated specially */
  38
  39 /* Macro used to disguise addresses so that leak finding can work */
  40 #define STACK_LOGGING_DISGUISE(address) (((unsigned)address) ^ 0x00005555) /* nicely idempotent */
  41
  42 typedef struct {
  43     unsigned    type;
  44     unsigned    uniqued_stack;
  45     unsigned    argument;
  46     unsigned    address; /* disguised, to avoid confusing leaks */
  47 } stack_logging_record_t;
  48
  49 typedef struct {
  50     unsigned    overall_num_bytes;
  51     unsigned    num_records;
  52     unsigned    lock; /* 0 means OK to lock; used for inter-process locking */
  53     unsigned    *uniquing_table; /* allocated using vm_allocate() */
  54             /* hashtable organized as (PC, uniqued parent)
  55             Only the second half of the table is active
  56             To enable us to grow dynamically */
  57     unsigned    uniquing_table_num_pages; /* number of pages of the table */
  58     unsigned    extra_retain_count; /* not used by stack_logging_log_stack */
  59     unsigned    filler[2]; /* align to cache lines for better performance */
  60     stack_logging_record_t      records[0]; /* records follow here */
  61 } stack_logging_record_list_t;
  62
  63 extern unsigned stack_logging_get_unique_stack(unsigned **table, unsigned *table_num_pages, unsigned *stack_entries, unsigned count, unsigned num_hot_to_skip);
  64     /* stack_entries are from hot to cold */
  65
  66 extern stack_logging_record_list_t *stack_logging_the_record_list;
  67     /* This is the global variable containing all logs */
  68
  69 extern int stack_logging_enable_logging;
  70     /* when clear, no logging takes place */
  71
  72 extern int stack_logging_dontcompact;
  73     /* default is to compact; when set does not compact alloc/free logs; useful for tracing history */
  74
  75 extern void stack_logging_log_stack(unsigned type, unsigned arg1, unsigned arg2, unsigned arg3, unsigned result, unsigned num_hot_to_skip);
  76
  77 extern kern_return_t stack_logging_get_frames(task_t task, memory_reader_t reader, vm_address_t address, vm_address_t *stack_frames_buffer, unsigned max_stack_frames, unsigned *num_frames);
  78     /* Gets the last record in stack_logging_the_record_list about address */
  79
  80 #define STACK_LOGGING_ENUMERATION_PROVIDED      1       // temporary to avoid dependencies between projects
  81
  82 extern kern_return_t stack_logging_enumerate_records(task_t task, memory_reader_t reader, vm_address_t address, void enumerator(stack_logging_record_t, void *), void *context);
  83     /* Gets all the records about address;
  84     If !address, gets all records */
  85
  86 extern kern_return_t stack_logging_frames_for_uniqued_stack(task_t task, memory_reader_t reader, unsigned uniqued_stack, vm_address_t *stack_frames_buffer, unsigned max_stack_frames, unsigned *num_frames);
  87     /* Given a uniqued_stack fills stack_frames_buffer */
  88
  89 extern void thread_stack_pcs(vm_address_t *buffer, unsigned max, unsigned *num);
  90     /* Convenience to fill buffer with the PCs of the frames, starting with the hot frames;
  91     num: returned number of frames
  92     */
  93