mbed_mem_trace.h

00001 
00002 /** \addtogroup platform */
00003 /** @{*/
00004 
00005 /* mbed Microcontroller Library
00006  * Copyright (c) 2006-2016 ARM Limited
00007  *
00008  * Licensed under the Apache License, Version 2.0 (the "License");
00009  * you may not use this file except in compliance with the License.
00010  * You may obtain a copy of the License at
00011  *
00012  *     http://www.apache.org/licenses/LICENSE-2.0
00013  *
00014  * Unless required by applicable law or agreed to in writing, software
00015  * distributed under the License is distributed on an "AS IS" BASIS,
00016  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00017  * See the License for the specific language governing permissions and
00018  * limitations under the License.
00019  */
00020 
00021 #ifndef __MBED_MEM_TRACE_H__
00022 #define __MBED_MEM_TRACE_H__
00023 
00024 #ifdef __cplusplus
00025 extern "C" {
00026 #endif
00027 
00028 #include <stdint.h>
00029 #include <stddef.h>
00030 
00031 /* Operation types for tracer */
00032 enum {
00033     MBED_MEM_TRACE_MALLOC,
00034     MBED_MEM_TRACE_REALLOC,
00035     MBED_MEM_TRACE_CALLOC,
00036     MBED_MEM_TRACE_FREE
00037 };
00038 
00039 /**
00040  * \defgroup platform_mem_trace mem_trace functions
00041  * @{
00042  */
00043 
00044 /* Prefix for the output of the default tracer */
00045 #define MBED_MEM_DEFAULT_TRACER_PREFIX  "#"
00046 
00047 /**
00048  * Type of the callback used by the memory tracer. This callback is called when a memory
00049  * allocation operation (malloc, realloc, calloc, free) is called and tracing is enabled
00050  * for that memory allocation function.
00051  *
00052  * @param op the ID of the operation (MBED_MEM_TRACE_MALLOC, MBED_MEM_TRACE_REALLOC,
00053  *           MBED_MEM_TRACE_CALLOC or MBED_MEM_TRACE_FREE).
00054  * @param res the result that the memory operation returned (NULL for 'free').
00055  * @param caller the caller of the memory operation. Note that the value of 'caller' might be
00056  *               unreliable.
00057  *
00058  * The rest of the parameters passed 'mbed_mem_trace_cb_t' are the same as the memory operations
00059  * that triggered its call (see 'man malloc' for details):
00060  *
00061  * - for malloc: cb(MBED_MEM_TRACE_MALLOC, res, caller, size).
00062  * - for realloc: cb(MBED_MEM_TRACE_REALLOC, res, caller, ptr, size).
00063  * - for calloc: cb(MBED_MEM_TRACE_CALLOC, res, caller, nmemb, size).
00064  * - for free: cb(MBED_MEM_TRACE_FREE, NULL, caller, ptr).
00065  */
00066 typedef void (*mbed_mem_trace_cb_t)(uint8_t op, void *res, void* caller, ...);
00067 
00068 /**
00069  * Set the callback used by the memory tracer (use NULL for disable tracing).
00070  *
00071  * @param cb the callback to call on each memory operation.
00072  */
00073 void mbed_mem_trace_set_callback(mbed_mem_trace_cb_t cb);
00074 
00075 /**
00076  * Trace lock.
00077  * @note Locking prevent recursive tracing of malloc/free inside relloc/calloc
00078  */
00079 void mbed_mem_trace_lock();
00080 
00081 /**
00082  * Trace unlock.
00083  */
00084 void mbed_mem_trace_unlock();
00085 
00086 /**
00087  * Trace a call to 'malloc'.
00088  * @param res the result of running 'malloc'.
00089  * @param size the 'size' argument given to 'malloc'.
00090  * @param caller the caller of the memory operation.
00091  * @return 'res' (the first argument).
00092  */
00093 void *mbed_mem_trace_malloc(void *res, size_t size, void *caller);
00094 
00095 /**
00096  * Trace a call to 'realloc'.
00097  * @param res the result of running 'realloc'.
00098  * @param ptr the 'ptr' argument given to 'realloc'.
00099  * @param size the 'size' argument given to 'realloc'.
00100  * @param caller the caller of the memory operation.
00101  * @return 'res' (the first argument).
00102  */
00103 void *mbed_mem_trace_realloc(void *res, void *ptr, size_t size, void *caller);
00104 
00105 /**
00106  * Trace a call to 'calloc'.
00107  * @param res the result of running 'calloc'.
00108  * @param num the 'nmemb' argument given to 'calloc'.
00109  * @param size the 'size' argument given to 'calloc'.
00110  * @param caller the caller of the memory operation.
00111  * @return 'res' (the first argument).
00112  */
00113 void *mbed_mem_trace_calloc(void *res, size_t num, size_t size, void *caller);
00114 
00115 /**
00116  * Trace a call to 'free'.
00117  * @param ptr the 'ptr' argument given to 'free'.
00118  * @param caller the caller of the memory operation.
00119  */
00120 void mbed_mem_trace_free(void *ptr, void *caller);
00121 
00122 /**
00123  * Default memory trace callback. DO NOT CALL DIRECTLY. It is meant to be used
00124  * as the second argument of 'mbed_mem_trace_setup'.
00125  *
00126  * The default callback outputs trace data using 'printf', in a format that's
00127  * easily parsable by an external tool. For each memory operation, the callback
00128  * outputs a line that begins with "#<op>:<0xresult>;<0xcaller>-":
00129  *
00130  * @param op        identifies the memory operation ('m' for 'malloc', 'r' for 'realloc',
00131  *                  'c' for 'calloc' and 'f' for 'free').
00132  * @param res       (base 16) is the result of the memor operation. This is always NULL
00133  *                  for 'free', since 'free' doesn't return anything.
00134  * @param caller    (base 16) is the caller of the memory operation. Note that the value
00135  *                  of 'caller' might be unreliable.
00136  *
00137  * The rest of the output depends on the operation being traced:
00138  *
00139  * - for 'malloc': 'size', where 'size' is the original argument to 'malloc'.
00140  * - for 'realloc': '0xptr;size', where 'ptr' (base 16) and 'size' are the original arguments to 'realloc'.
00141  * - for 'calloc': 'nmemb;size', where 'nmemb' and 'size' are the original arguments to 'calloc'.
00142  * - for 'free': '0xptr', where 'ptr' (base 16) is the original argument to 'free'.
00143  *
00144  * Examples:
00145  *
00146  * - "#m:0x20003240;0x600d-50" encodes a 'malloc' that returned 0x20003240, was called
00147  *   by the instruction at 0x600D with a the 'size' argument equal to 50.
00148  * - "#f:0x0;0x602f-0x20003240" encodes a 'free' that was called by the instruction at
00149  *   0x602f with the 'ptr' argument equal to 0x20003240.
00150  */
00151 void mbed_mem_trace_default_callback(uint8_t op, void *res, void *caller, ...);
00152 
00153 /** @}*/
00154 
00155 #ifdef __cplusplus
00156 }
00157 #endif
00158 
00159 #endif// #ifndef __MBED_MEM_TRACE_H__
00160 
00161 
00162 /** @}*/