gen/stack_logging.h

   1 /*
   2  * Copyright (c) 1999-2007 Apple 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) ((address) ^ 0x00005555) /* nicely idempotent */
  41
  42 extern int stack_logging_enable_logging; /* when clear, no logging takes place */
  43 extern int stack_logging_dontcompact; /* default is to compact; when set does not compact alloc/free logs; useful for tracing history */
  44 extern int stack_logging_finished_init; /* set after we've returned from the Libsystem initialiser */
  45 extern int stack_logging_postponed; /* set if we needed to postpone logging till after initialisation */
  46
  47
  48 extern void stack_logging_log_stack(unsigned type, unsigned arg1, unsigned arg2, unsigned arg3, unsigned result, unsigned num_hot_to_skip);
  49         /* This is the old log-to-memory logger, which is now deprecated.  It remains for compatibility with performance tools that haven't been updated to disk_stack_logging_log_stack() yet. */
  50
  51 extern void __disk_stack_logging_log_stack(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);
  52         /* Fits as the malloc_logger; logs malloc/free/realloc events and can log custom events if called directly */
  53
  54
  55 /* 64-bit-aware stack log access.  As new SPI, these routines are prefixed with double-underscore to avoid conflict with Libsystem clients. */
  56
  57 typedef struct {
  58         uint32_t                type_flags;
  59         uint64_t                stack_identifier;
  60         uint64_t                argument;
  61         mach_vm_address_t       address;
  62 } mach_stack_logging_record_t;
  63
  64 extern kern_return_t __mach_stack_logging_set_file_path(task_t task, char* file_path);
  65
  66 extern kern_return_t __mach_stack_logging_get_frames(task_t task, mach_vm_address_t address, mach_vm_address_t *stack_frames_buffer, uint32_t max_stack_frames, uint32_t *count);
  67     /* Gets the last allocation record (malloc, realloc, or free) about address */
  68
  69 extern kern_return_t __mach_stack_logging_enumerate_records(task_t task, mach_vm_address_t address, void enumerator(mach_stack_logging_record_t, void *), void *context);
  70     /* Applies enumerator to all records involving address sending context as enumerator's second parameter; if !address, applies enumerator to all records */
  71
  72 extern kern_return_t __mach_stack_logging_frames_for_uniqued_stack(task_t task, uint64_t stack_identifier, mach_vm_address_t *stack_frames_buffer, uint32_t max_stack_frames, uint32_t *count);
  73     /* Given a uniqued_stack fills stack_frames_buffer */
  74
  75
  76 #pragma mark -
  77 #pragma mark Legacy
  78
  79 /* The following is the old 32-bit-only, in-process-memory stack logging.  This is deprecated and clients should move to the above 64-bit-aware disk stack logging SPI. */
  80
  81 typedef struct {
  82     unsigned    type;
  83     unsigned    uniqued_stack;
  84     unsigned    argument;
  85     unsigned    address; /* disguised, to avoid confusing leaks */
  86 } stack_logging_record_t;
  87
  88 typedef struct {
  89     unsigned    overall_num_bytes;
  90     unsigned    num_records;
  91     unsigned    lock; /* 0 means OK to lock; used for inter-process locking */
  92     unsigned    *uniquing_table; /* allocated using vm_allocate() */
  93             /* hashtable organized as (PC, uniqued parent)
  94             Only the second half of the table is active
  95             To enable us to grow dynamically */
  96     unsigned    uniquing_table_num_pages; /* number of pages of the table */
  97     unsigned    extra_retain_count; /* not used by stack_logging_log_stack */
  98     unsigned    filler[2]; /* align to cache lines for better performance */
  99     stack_logging_record_t      records[0]; /* records follow here */
 100 } stack_logging_record_list_t;
 101
 102 extern stack_logging_record_list_t *stack_logging_the_record_list;
 103     /* This is the global variable containing all logs */
 104
 105 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);
 106     /* Gets the last record in stack_logging_the_record_list about address */
 107
 108 #define STACK_LOGGING_ENUMERATION_PROVIDED      1       // temporary to avoid dependencies between projects
 109
 110 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);
 111     /* Gets all the records about address;
 112     If !address, gets all records */
 113
 114 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);
 115     /* Given a uniqued_stack fills stack_frames_buffer */
 116
 117
 118
 119 extern void thread_stack_pcs(vm_address_t *buffer, unsigned max, unsigned *num);
 120     /* Convenience to fill buffer with the PCs of the frames, starting with the hot frames;
 121     num: returned number of frames
 122     */
 123