xref: /llvm-project-15.0.7/lldb/tools/debugserver/source/MacOSX/stack_logging.h (revision b9c1b51e)

/*
 * Copyright (c) 1999-2007 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@
 */

#ifndef malloc_history_test_stack_logging_h
#define malloc_history_test_stack_logging_h

#import <malloc/malloc.h>

#define stack_logging_type_free 0
#define stack_logging_type_generic                                             \
  1 /* anything that is not allocation/deallocation */
#define stack_logging_type_alloc 2   /* malloc, realloc, etc... */
#define stack_logging_type_dealloc 4 /* free, realloc, etc... */

// Following flags are absorbed by stack_logging_log_stack()
#define stack_logging_flag_zone 8    /* NSZoneMalloc, etc... */
#define stack_logging_flag_calloc 16 /* multiply arguments to get the size */
#define stack_logging_flag_object                                              \
  32 /* NSAllocateObject(Class, extraBytes, zone) */
#define stack_logging_flag_cleared 64 /* for NewEmptyHandle */
#define stack_logging_flag_handle 128 /* for Handle (de-)allocation routines   \
                                         */
#define stack_logging_flag_set_handle_size                                     \
  256 /* (Handle, newSize) treated specially */

/* Macro used to disguise addresses so that leak finding can work */
#define STACK_LOGGING_DISGUISE(address)                                        \
  ((address) ^ 0x00005555) /* nicely idempotent */

extern "C" int
    stack_logging_enable_logging; /* when clear, no logging takes place */
extern "C" int stack_logging_dontcompact; /* default is to compact; when set
                                             does not compact alloc/free logs;
                                             useful for tracing history */

extern "C" void stack_logging_log_stack(unsigned type, unsigned arg1,
                                        unsigned arg2, unsigned arg3,
                                        unsigned result,
                                        unsigned num_hot_to_skip);
/* 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. */

extern "C" 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);
/* Fits as the malloc_logger; logs malloc/free/realloc events and can log custom
 * events if called directly */

/* 64-bit-aware stack log access. */
typedef struct {
  uint32_t type_flags;
  uint64_t stack_identifier;
  uint64_t argument;
  mach_vm_address_t address;
} mach_stack_logging_record_t;

extern "C" 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);
/* Gets the last allocation record (malloc, realloc, or free) about address */

extern "C" 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);
/* Applies enumerator to all records involving address sending context as
 * enumerator's second parameter; if !address, applies enumerator to all records
 */

extern "C" 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);
/* Given a uniqued_stack fills stack_frames_buffer */

#pragma mark -
#pragma mark Legacy

/* 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. */

typedef struct {
  unsigned type;
  unsigned uniqued_stack;
  unsigned argument;
  unsigned address; /* disguised, to avoid confusing leaks */
} stack_logging_record_t;

typedef struct {
  unsigned overall_num_bytes;
  unsigned num_records;
  unsigned lock; /* 0 means OK to lock; used for inter-process locking */
  unsigned *uniquing_table; /* allocated using vm_allocate() */
  /* hashtable organized as (PC, uniqued parent)
   Only the second half of the table is active
   To enable us to grow dynamically */
  unsigned uniquing_table_num_pages; /* number of pages of the table */
  unsigned extra_retain_count;       /* not used by stack_logging_log_stack */
  unsigned filler[2]; /* align to cache lines for better performance */
  stack_logging_record_t records[0]; /* records follow here */
} stack_logging_record_list_t;

extern "C" stack_logging_record_list_t *stack_logging_the_record_list;
/* This is the global variable containing all logs */

extern "C" 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);
/* Gets the last record in stack_logging_the_record_list about address */

#define STACK_LOGGING_ENUMERATION_PROVIDED                                     \
  1 // temporary to avoid dependencies between projects

extern "C" 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);
/* Gets all the records about address;
 If !address, gets all records */

extern "C" 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);
/* Given a uniqued_stack fills stack_frames_buffer */

extern "C" void thread_stack_pcs(vm_address_t *buffer, unsigned max,
                                 unsigned *num);
/* Convenience to fill buffer with the PCs of the frames, starting with the hot
 frames;
 num: returned number of frames
 */

#endif