mbed_alloc_wrappers.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2016 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "platform/mbed_mem_trace.h"
00018 #include "platform/mbed_stats.h"
00019 #include "platform/mbed_toolchain.h"
00020 #include "platform/SingletonPtr.h"
00021 #include "platform/PlatformMutex.h"
00022 #include <stddef.h>
00023 #include <stdio.h>
00024 #include <string.h>
00025 #include <stdlib.h>
00026 
00027 /* There are two memory tracers in mbed OS:
00028 
00029 - the first can be used to detect the maximum heap usage at runtime. It is
00030   activated by defining the MBED_HEAP_STATS_ENABLED macro.
00031 - the second can be used to trace each memory call by automatically invoking
00032   a callback on each memory operation (see hal/api/mbed_mem_trace.h). It is
00033   activated by defining the MBED_MEM_TRACING_ENABLED macro.
00034 
00035 Both tracers can be activated and deactivated in any combination. If both tracers
00036 are active, the second one (MBED_MEM_TRACING_ENABLED) will trace the first one's
00037 (MBED_HEAP_STATS_ENABLED) memory calls.*/
00038 
00039 /******************************************************************************/
00040 /* Implementation of the runtime max heap usage checker                       */
00041 /******************************************************************************/
00042 
00043 /* Size must be a multiple of 8 to keep alignment */
00044 typedef struct {
00045     uint32_t size;
00046     uint32_t pad;
00047 } alloc_info_t;
00048 
00049 #ifdef MBED_MEM_TRACING_ENABLED
00050 static SingletonPtr<PlatformMutex>  mem_trace_mutex;
00051 #endif
00052 #ifdef MBED_HEAP_STATS_ENABLED
00053 static SingletonPtr<PlatformMutex>  malloc_stats_mutex;
00054 static mbed_stats_heap_t heap_stats = {0, 0, 0, 0, 0};
00055 #endif
00056 
00057 void mbed_stats_heap_get(mbed_stats_heap_t *stats)
00058 {
00059 #ifdef MBED_HEAP_STATS_ENABLED
00060     extern uint32_t mbed_heap_size;
00061     heap_stats.reserved_size = mbed_heap_size;
00062 
00063     malloc_stats_mutex->lock();
00064     memcpy(stats, &heap_stats, sizeof(mbed_stats_heap_t));
00065     malloc_stats_mutex->unlock();
00066 #else
00067     memset(stats, 0, sizeof(mbed_stats_heap_t));
00068 #endif
00069 }
00070 
00071 /******************************************************************************/
00072 /* GCC memory allocation wrappers                                             */
00073 /******************************************************************************/
00074 
00075 #if defined(TOOLCHAIN_GCC)
00076 
00077 #ifdef   FEATURE_UVISOR
00078 #include "uvisor-lib/uvisor-lib.h"
00079 #endif/* FEATURE_UVISOR */
00080 
00081 extern "C" {
00082     void * __real__malloc_r(struct _reent * r, size_t size);
00083     void * __real__memalign_r(struct _reent * r, size_t alignment, size_t bytes);
00084     void * __real__realloc_r(struct _reent * r, void * ptr, size_t size);
00085     void __real__free_r(struct _reent * r, void * ptr);
00086     void* __real__calloc_r(struct _reent * r, size_t nmemb, size_t size);
00087 }
00088 
00089 // TODO: memory tracing doesn't work with uVisor enabled.
00090 #if !defined(FEATURE_UVISOR)
00091 
00092 extern "C" void * __wrap__malloc_r(struct _reent * r, size_t size) {
00093     void *ptr = NULL;
00094 #ifdef MBED_HEAP_STATS_ENABLED
00095     malloc_stats_mutex->lock();
00096     alloc_info_t *alloc_info = (alloc_info_t*)__real__malloc_r(r, size + sizeof(alloc_info_t));
00097     if (alloc_info != NULL) {
00098         alloc_info->size = size;
00099         ptr = (void*)(alloc_info + 1);
00100         heap_stats.current_size += size;
00101         heap_stats.total_size += size;
00102         heap_stats.alloc_cnt += 1;
00103         if (heap_stats.current_size > heap_stats.max_size) {
00104             heap_stats.max_size = heap_stats.current_size;
00105         }
00106     } else {
00107         heap_stats.alloc_fail_cnt += 1;
00108     }
00109     malloc_stats_mutex->unlock();
00110 #else // #ifdef MBED_HEAP_STATS_ENABLED
00111     ptr = __real__malloc_r(r, size);
00112 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00113 #ifdef MBED_MEM_TRACING_ENABLED
00114     mem_trace_mutex->lock();
00115     mbed_mem_trace_malloc(ptr, size, MBED_CALLER_ADDR());
00116     mem_trace_mutex->unlock();
00117 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00118     return ptr;
00119 }
00120 
00121 extern "C" void * __wrap__realloc_r(struct _reent * r, void * ptr, size_t size) {
00122     void *new_ptr = NULL;
00123 #ifdef MBED_HEAP_STATS_ENABLED
00124     // Implement realloc_r with malloc and free.
00125     // The function realloc_r can't be used here directly since
00126     // it can call into __wrap__malloc_r (returns ptr + 4) or
00127     // resize memory directly (returns ptr + 0).
00128 
00129     // Note - no lock needed since malloc and free are thread safe
00130 
00131     // Get old size
00132     uint32_t old_size = 0;
00133     if (ptr != NULL) {
00134         alloc_info_t *alloc_info = ((alloc_info_t*)ptr) - 1;
00135         old_size = alloc_info->size;
00136     }
00137 
00138     // Allocate space
00139     if (size != 0) {
00140         new_ptr = malloc(size);
00141     }
00142 
00143     // If the new buffer has been allocated copy the data to it
00144     // and free the old buffer
00145     if (new_ptr != NULL) {
00146         uint32_t copy_size = (old_size < size) ? old_size : size;
00147         memcpy(new_ptr, (void*)ptr, copy_size);
00148         free(ptr);
00149     }
00150 #else // #ifdef MBED_HEAP_STATS_ENABLED
00151     new_ptr = __real__realloc_r(r, ptr, size);
00152 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00153 #ifdef MBED_MEM_TRACING_ENABLED
00154     mem_trace_mutex->lock();
00155     mbed_mem_trace_realloc(new_ptr, ptr, size, MBED_CALLER_ADDR());
00156     mem_trace_mutex->unlock();
00157 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00158     return new_ptr;
00159 }
00160 
00161 extern "C" void __wrap__free_r(struct _reent * r, void * ptr) {
00162 #ifdef MBED_HEAP_STATS_ENABLED
00163     malloc_stats_mutex->lock();
00164     alloc_info_t *alloc_info = NULL;
00165     if (ptr != NULL) {
00166         alloc_info = ((alloc_info_t*)ptr) - 1;
00167         heap_stats.current_size -= alloc_info->size;
00168         heap_stats.alloc_cnt -= 1;
00169     }
00170     __real__free_r(r, (void*)alloc_info);
00171     malloc_stats_mutex->unlock();
00172 #else // #ifdef MBED_HEAP_STATS_ENABLED
00173     __real__free_r(r, ptr);
00174 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00175 #ifdef MBED_MEM_TRACING_ENABLED
00176     mem_trace_mutex->lock();
00177     mbed_mem_trace_free(ptr, MBED_CALLER_ADDR());
00178     mem_trace_mutex->unlock();
00179 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00180 }
00181 
00182 extern "C" void * __wrap__calloc_r(struct _reent * r, size_t nmemb, size_t size) {
00183     void *ptr = NULL;
00184 #ifdef MBED_HEAP_STATS_ENABLED
00185     // Note - no lock needed since malloc is thread safe
00186 
00187     ptr = malloc(nmemb * size);
00188     if (ptr != NULL) {
00189         memset(ptr, 0, nmemb * size);
00190     }
00191 #else // #ifdef MBED_HEAP_STATS_ENABLED
00192     ptr = __real__calloc_r(r, nmemb, size);
00193 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00194 #ifdef MBED_MEM_TRACING_ENABLED
00195     mem_trace_mutex->lock();
00196     mbed_mem_trace_calloc(ptr, nmemb, size, MBED_CALLER_ADDR());
00197     mem_trace_mutex->unlock();
00198 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00199     return ptr;
00200 }
00201 
00202 extern "C" void * __wrap__memalign_r(struct _reent * r, size_t alignment, size_t bytes) {
00203     return __real__memalign_r(r, alignment, bytes);
00204 }
00205 
00206 #endif // if !defined(FEATURE_UVISOR)
00207 
00208 
00209 /******************************************************************************/
00210 /* ARMCC memory allocation wrappers                                           */
00211 /******************************************************************************/
00212 
00213 #elif defined(TOOLCHAIN_ARM) // #if defined(TOOLCHAIN_GCC)
00214 
00215 /* Enable hooking of memory function only if tracing is also enabled */
00216 #if defined(MBED_MEM_TRACING_ENABLED) || defined(MBED_HEAP_STATS_ENABLED)
00217 
00218 extern "C" {
00219     void *$Super$$malloc(size_t size);
00220     void *$Super$$realloc(void *ptr, size_t size);
00221     void *$Super$$calloc(size_t nmemb, size_t size);
00222     void $Super$$free(void *ptr);
00223 }
00224 
00225 extern "C" void* $Sub$$malloc(size_t size) {
00226     void *ptr = NULL;
00227 #ifdef MBED_HEAP_STATS_ENABLED
00228     malloc_stats_mutex->lock();
00229     alloc_info_t *alloc_info = (alloc_info_t*)$Super$$malloc(size + sizeof(alloc_info_t));
00230     if (alloc_info != NULL) {
00231         alloc_info->size = size;
00232         ptr = (void*)(alloc_info + 1);
00233         heap_stats.current_size += size;
00234         heap_stats.total_size += size;
00235         heap_stats.alloc_cnt += 1;
00236         if (heap_stats.current_size > heap_stats.max_size) {
00237             heap_stats.max_size = heap_stats.current_size;
00238         }
00239     } else {
00240         heap_stats.alloc_fail_cnt += 1;
00241     }
00242     malloc_stats_mutex->unlock();
00243 #else // #ifdef MBED_HEAP_STATS_ENABLED
00244     ptr = $Super$$malloc(size);
00245 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00246 #ifdef MBED_MEM_TRACING_ENABLED
00247     mem_trace_mutex->lock();
00248     mbed_mem_trace_malloc(ptr, size, MBED_CALLER_ADDR());
00249     mem_trace_mutex->unlock();
00250 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00251     return ptr;
00252 }
00253 
00254 extern "C" void* $Sub$$realloc(void *ptr, size_t size) {
00255     void *new_ptr = NULL;
00256 #ifdef MBED_HEAP_STATS_ENABLED
00257     // Note - no lock needed since malloc and free are thread safe
00258 
00259     // Get old size
00260     uint32_t old_size = 0;
00261     if (ptr != NULL) {
00262         alloc_info_t *alloc_info = ((alloc_info_t*)ptr) - 1;
00263         old_size = alloc_info->size;
00264     }
00265 
00266     // Allocate space
00267     if (size != 0) {
00268         new_ptr = malloc(size);
00269     }
00270 
00271     // If the new buffer has been allocated copy the data to it
00272     // and free the old buffer
00273     if (new_ptr != NULL) {
00274         uint32_t copy_size = (old_size < size) ? old_size : size;
00275         memcpy(new_ptr, (void*)ptr, copy_size);
00276         free(ptr);
00277     }
00278 #else // #ifdef MBED_HEAP_STATS_ENABLED
00279     new_ptr = $Super$$realloc(ptr, size);
00280 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00281 #ifdef MBED_MEM_TRACING_ENABLED
00282     mem_trace_mutex->lock();
00283     mbed_mem_trace_realloc(new_ptr, ptr, size, MBED_CALLER_ADDR());
00284     mem_trace_mutex->unlock();
00285 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00286     return new_ptr;
00287 }
00288 
00289 extern "C" void *$Sub$$calloc(size_t nmemb, size_t size) {
00290     void *ptr = NULL;
00291 #ifdef MBED_HEAP_STATS_ENABLED
00292     // Note - no lock needed since malloc is thread safe
00293     ptr = malloc(nmemb * size);
00294     if (ptr != NULL) {
00295         memset(ptr, 0, nmemb * size);
00296     }
00297 #else // #ifdef MBED_HEAP_STATS_ENABLED
00298     ptr = $Super$$calloc(nmemb, size);
00299 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00300 #ifdef MBED_MEM_TRACING_ENABLED
00301     mem_trace_mutex->lock();
00302     mbed_mem_trace_calloc(ptr, nmemb, size, MBED_CALLER_ADDR());
00303     mem_trace_mutex->unlock();
00304 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00305     return ptr;
00306 }
00307 
00308 extern "C" void $Sub$$free(void *ptr) {
00309 #ifdef MBED_HEAP_STATS_ENABLED
00310     malloc_stats_mutex->lock();
00311     alloc_info_t *alloc_info = NULL;
00312     if (ptr != NULL) {
00313         alloc_info = ((alloc_info_t*)ptr) - 1;
00314         heap_stats.current_size -= alloc_info->size;
00315         heap_stats.alloc_cnt -= 1;
00316     }
00317     $Super$$free((void*)alloc_info);
00318     malloc_stats_mutex->unlock();
00319 #else // #ifdef MBED_HEAP_STATS_ENABLED
00320     $Super$$free(ptr);
00321 #endif // #ifdef MBED_HEAP_STATS_ENABLED
00322 #ifdef MBED_MEM_TRACING_ENABLED
00323     mem_trace_mutex->lock();
00324     mbed_mem_trace_free(ptr, MBED_CALLER_ADDR());
00325     mem_trace_mutex->unlock();
00326 #endif // #ifdef MBED_MEM_TRACING_ENABLED
00327 }
00328 
00329 #endif // #if defined(MBED_MEM_TRACING_ENABLED) || defined(MBED_HEAP_STATS_ENABLED)
00330 
00331 /******************************************************************************/
00332 /* Allocation wrappers for other toolchains are not supported yet             */
00333 /******************************************************************************/
00334 
00335 #else // #if defined(TOOLCHAIN_GCC)
00336 
00337 #ifdef MBED_MEM_TRACING_ENABLED
00338 #warning Memory tracing is not supported with the current toolchain.
00339 #endif
00340 
00341 #ifdef MBED_HEAP_STATS_ENABLED
00342 #warning Heap statistics are not supported with the current toolchain.
00343 #endif
00344 
00345 #endif // #if defined(TOOLCHAIN_GCC)
00346 
00347