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mbed_mem_trace.h
1 
2 /** \addtogroup platform */
3 /** @{*/
4 
5 /* mbed Microcontroller Library
6  * Copyright (c) 2006-2016 ARM Limited
7  * SPDX-License-Identifier: Apache-2.0
8  *
9  * Licensed under the Apache License, Version 2.0 (the "License");
10  * you may not use this file except in compliance with the License.
11  * You may obtain a copy of the License at
12  *
13  * http://www.apache.org/licenses/LICENSE-2.0
14  *
15  * Unless required by applicable law or agreed to in writing, software
16  * distributed under the License is distributed on an "AS IS" BASIS,
17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18  * See the License for the specific language governing permissions and
19  * limitations under the License.
20  */
21 
22 #ifndef __MBED_MEM_TRACE_H__
23 #define __MBED_MEM_TRACE_H__
24 
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
28 
29 #include <stdint.h>
30 #include <stddef.h>
31 
32 /**
33  * enum Memory operation types for tracer
34  */
35 enum {
36  MBED_MEM_TRACE_MALLOC, /**< Identifier for malloc operation */
37  MBED_MEM_TRACE_REALLOC, /**< Identifier for realloc operation */
38  MBED_MEM_TRACE_CALLOC, /**< Identifier for calloc operation */
39  MBED_MEM_TRACE_FREE /**< Identifier for free operation */
40 };
41 
42 /**
43  * \defgroup platform_mem_trace mem_trace functions
44  * @{
45  */
46 
47 /* Prefix for the output of the default tracer */
48 #define MBED_MEM_DEFAULT_TRACER_PREFIX "#"
49 
50 /**
51  * Type of the callback used by the memory tracer. This callback is called when a memory
52  * allocation operation (malloc, realloc, calloc, free) is called and tracing is enabled
53  * for that memory allocation function.
54  *
55  * @param op the ID of the operation (MBED_MEM_TRACE_MALLOC, MBED_MEM_TRACE_REALLOC,
56  * MBED_MEM_TRACE_CALLOC or MBED_MEM_TRACE_FREE).
57  * @param res the result that the memory operation returned (NULL for 'free').
58  * @param caller the caller of the memory operation. Note that the value of 'caller' might be
59  * unreliable.
60  *
61  * The rest of the parameters passed 'mbed_mem_trace_cb_t' are the same as the memory operations
62  * that triggered its call (see 'man malloc' for details):
63  *
64  * - for malloc: cb(MBED_MEM_TRACE_MALLOC, res, caller, size).
65  * - for realloc: cb(MBED_MEM_TRACE_REALLOC, res, caller, ptr, size).
66  * - for calloc: cb(MBED_MEM_TRACE_CALLOC, res, caller, nmemb, size).
67  * - for free: cb(MBED_MEM_TRACE_FREE, NULL, caller, ptr).
68  */
69 typedef void (*mbed_mem_trace_cb_t)(uint8_t op, void *res, void *caller, ...);
70 
71 /**
72  * Set the callback used by the memory tracer (use NULL for disable tracing).
73  *
74  * @param cb the callback to call on each memory operation.
75  */
77 
78 /**
79  * Disable the memory trace output by disabling the callback function
80  */
82 
83 /**
84  * Re-enable the memory trace output with the cb in use when disable was called
85  */
87 
88 /**
89  * Trace lock.
90  * @note Locking prevent recursive tracing of malloc/free inside realloc/calloc
91  */
92 void mbed_mem_trace_lock();
93 
94 /**
95  * Trace unlock.
96  */
98 
99 /**
100  * Trace a call to 'malloc'.
101  * @param res the result of running 'malloc'.
102  * @param size the 'size' argument given to 'malloc'.
103  * @param caller the caller of the memory operation.
104  * @return 'res' (the first argument).
105  */
106 void *mbed_mem_trace_malloc(void *res, size_t size, void *caller);
107 
108 /**
109  * Trace a call to 'realloc'.
110  * @param res the result of running 'realloc'.
111  * @param ptr the 'ptr' argument given to 'realloc'.
112  * @param size the 'size' argument given to 'realloc'.
113  * @param caller the caller of the memory operation.
114  * @return 'res' (the first argument).
115  */
116 void *mbed_mem_trace_realloc(void *res, void *ptr, size_t size, void *caller);
117 
118 /**
119  * Trace a call to 'calloc'.
120  * @param res the result of running 'calloc'.
121  * @param num the 'nmemb' argument given to 'calloc'.
122  * @param size the 'size' argument given to 'calloc'.
123  * @param caller the caller of the memory operation.
124  * @return 'res' (the first argument).
125  */
126 void *mbed_mem_trace_calloc(void *res, size_t num, size_t size, void *caller);
127 
128 /**
129  * Trace a call to 'free'.
130  * @param ptr the 'ptr' argument given to 'free'.
131  * @param caller the caller of the memory operation.
132  */
133 void mbed_mem_trace_free(void *ptr, void *caller);
134 
135 /**
136  * Default memory trace callback. DO NOT CALL DIRECTLY. It is meant to be used
137  * as the second argument of 'mbed_mem_trace_setup'.
138  *
139  * The default callback outputs trace data using 'printf', in a format that's
140  * easily parsable by an external tool. For each memory operation, the callback
141  * outputs a line that begins with "#<op>:<0xresult>;<0xcaller>-":
142  *
143  * @param op identifies the memory operation ('m' for 'malloc', 'r' for 'realloc',
144  * 'c' for 'calloc' and 'f' for 'free').
145  * @param res (base 16) is the result of the memory operation. This is always NULL
146  * for 'free', since 'free' doesn't return anything.
147  * @param caller (base 16) is the caller of the memory operation. Note that the value
148  * of 'caller' might be unreliable.
149  *
150  * The rest of the output depends on the operation being traced:
151  *
152  * - for 'malloc': 'size', where 'size' is the original argument to 'malloc'.
153  * - for 'realloc': '0xptr;size', where 'ptr' (base 16) and 'size' are the original arguments to 'realloc'.
154  * - for 'calloc': 'nmemb;size', where 'nmemb' and 'size' are the original arguments to 'calloc'.
155  * - for 'free': '0xptr', where 'ptr' (base 16) is the original argument to 'free'.
156  *
157  * Examples:
158  *
159  * - "#m:0x20003240;0x600d-50" encodes a 'malloc' that returned 0x20003240, was called
160  * by the instruction at 0x600D with a the 'size' argument equal to 50.
161  * - "#f:0x0;0x602f-0x20003240" encodes a 'free' that was called by the instruction at
162  * 0x602f with the 'ptr' argument equal to 0x20003240.
163  */
164 void mbed_mem_trace_default_callback(uint8_t op, void *res, void *caller, ...);
165 
166 /** @}*/
167 
168 #ifdef __cplusplus
169 }
170 #endif
171 
172 #endif// #ifndef __MBED_MEM_TRACE_H__
173 
174 
175 /** @}*/
Identifier for free operation.
void mbed_mem_trace_unlock()
Trace unlock.
Identifier for calloc operation.
void mbed_mem_trace_set_callback(mbed_mem_trace_cb_t cb)
Set the callback used by the memory tracer (use NULL for disable tracing).
void mbed_mem_trace_enable()
Re-enable the memory trace output with the cb in use when disable was called.
void mbed_mem_trace_lock()
Trace lock.
void * mbed_mem_trace_calloc(void *res, size_t num, size_t size, void *caller)
Trace a call to &#39;calloc&#39;.
void * mbed_mem_trace_malloc(void *res, size_t size, void *caller)
Trace a call to &#39;malloc&#39;.
void mbed_mem_trace_default_callback(uint8_t op, void *res, void *caller,...)
Default memory trace callback.
void mbed_mem_trace_disable()
Disable the memory trace output by disabling the callback function.
Identifier for malloc operation.
void mbed_mem_trace_free(void *ptr, void *caller)
Trace a call to &#39;free&#39;.
Identifier for realloc operation.
void(* mbed_mem_trace_cb_t)(uint8_t op, void *res, void *caller,...)
Type of the callback used by the memory tracer.
void * mbed_mem_trace_realloc(void *res, void *ptr, size_t size, void *caller)
Trace a call to &#39;realloc&#39;.
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