Diff: platform/mbed_alloc_wrappers.cpp

Revision:

149:156823d33999

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbed_alloc_wrappers.cpp	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,338 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2016 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "platform/mbed_mem_trace.h"
+#include "platform/mbed_stats.h"
+#include "platform/toolchain.h"
+#include "platform/SingletonPtr.h"
+#include "platform/PlatformMutex.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* There are two memory tracers in mbed OS:
+
+- the first can be used to detect the maximum heap usage at runtime. It is
+  activated by defining the MBED_HEAP_STATS_ENABLED macro.
+- the second can be used to trace each memory call by automatically invoking
+  a callback on each memory operation (see hal/api/mbed_mem_trace.h). It is
+  activated by defining the MBED_MEM_TRACING_ENABLED macro.
+
+Both tracers can be activated and deactivated in any combination. If both tracers
+are active, the second one (MBED_MEM_TRACING_ENABLED) will trace the first one's
+(MBED_HEAP_STATS_ENABLED) memory calls.*/
+
+/******************************************************************************/
+/* Implementation of the runtime max heap usage checker                       */
+/******************************************************************************/
+
+/* Size must be a multiple of 8 to keep alignment */
+typedef struct {
+    uint32_t size;
+    uint32_t pad;
+} alloc_info_t;
+
+#ifdef MBED_MEM_TRACING_ENABLED
+static SingletonPtr<PlatformMutex> mem_trace_mutex;
+#endif
+#ifdef MBED_HEAP_STATS_ENABLED
+static SingletonPtr<PlatformMutex> malloc_stats_mutex;
+static mbed_stats_heap_t heap_stats = {0, 0, 0, 0, 0};
+#endif
+
+void mbed_stats_heap_get(mbed_stats_heap_t *stats)
+{
+#ifdef MBED_HEAP_STATS_ENABLED
+    malloc_stats_mutex->lock();
+    memcpy(stats, &heap_stats, sizeof(mbed_stats_heap_t));
+    malloc_stats_mutex->unlock();
+#else
+    memset(stats, 0, sizeof(mbed_stats_heap_t));
+#endif
+}
+
+/******************************************************************************/
+/* GCC memory allocation wrappers                                             */
+/******************************************************************************/
+
+#if defined(TOOLCHAIN_GCC)
+
+#ifdef   FEATURE_UVISOR
+#include "uvisor-lib/uvisor-lib.h"
+#endif/* FEATURE_UVISOR */
+
+extern "C" {
+    void * __real__malloc_r(struct _reent * r, size_t size);
+    void * __real__realloc_r(struct _reent * r, void * ptr, size_t size);
+    void __real__free_r(struct _reent * r, void * ptr);
+    void* __real__calloc_r(struct _reent * r, size_t nmemb, size_t size);
+}
+
+// TODO: memory tracing doesn't work with uVisor enabled.
+#if !defined(FEATURE_UVISOR)
+
+extern "C" void * __wrap__malloc_r(struct _reent * r, size_t size) {
+    void *ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    malloc_stats_mutex->lock();
+    alloc_info_t *alloc_info = (alloc_info_t*)__real__malloc_r(r, size + sizeof(alloc_info_t));
+    if (alloc_info != NULL) {
+        alloc_info->size = size;
+        ptr = (void*)(alloc_info + 1);
+        heap_stats.current_size += size;
+        heap_stats.total_size += size;
+        heap_stats.alloc_cnt += 1;
+        if (heap_stats.current_size > heap_stats.max_size) {
+            heap_stats.max_size = heap_stats.current_size;
+        }
+    } else {
+        heap_stats.alloc_fail_cnt += 1;
+    }
+    malloc_stats_mutex->unlock();
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    ptr = __real__malloc_r(r, size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_malloc(ptr, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return ptr;
+}
+
+extern "C" void * __wrap__realloc_r(struct _reent * r, void * ptr, size_t size) {
+    void *new_ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    // Implement realloc_r with malloc and free.
+    // The function realloc_r can't be used here directly since
+    // it can call into __wrap__malloc_r (returns ptr + 4) or
+    // resize memory directly (returns ptr + 0).
+
+    // Note - no lock needed since malloc and free are thread safe
+
+    // Get old size
+    uint32_t old_size = 0;
+    if (ptr != NULL) {
+        alloc_info_t *alloc_info = ((alloc_info_t*)ptr) - 1;
+        old_size = alloc_info->size;
+    }
+
+    // Allocate space
+    if (size != 0) {
+        new_ptr = malloc(size);
+    }
+
+    // If the new buffer has been allocated copy the data to it
+    // and free the old buffer
+    if (new_ptr != NULL) {
+        uint32_t copy_size = (old_size < size) ? old_size : size;
+        memcpy(new_ptr, (void*)ptr, copy_size);
+        free(ptr);
+    }
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    new_ptr = __real__realloc_r(r, ptr, size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_realloc(new_ptr, ptr, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return new_ptr;
+}
+
+extern "C" void __wrap__free_r(struct _reent * r, void * ptr) {
+#ifdef MBED_HEAP_STATS_ENABLED
+    malloc_stats_mutex->lock();
+    alloc_info_t *alloc_info = NULL;
+    if (ptr != NULL) {
+        alloc_info = ((alloc_info_t*)ptr) - 1;
+        heap_stats.current_size -= alloc_info->size;
+        heap_stats.alloc_cnt -= 1;
+    }
+    __real__free_r(r, (void*)alloc_info);
+    malloc_stats_mutex->unlock();
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    __real__free_r(r, ptr);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_free(ptr, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+}
+
+#endif // if !defined(FEATURE_UVISOR)
+
+extern "C" void * __wrap__calloc_r(struct _reent * r, size_t nmemb, size_t size) {
+    void *ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    // Note - no lock needed since malloc is thread safe
+
+    ptr = malloc(nmemb * size);
+    if (ptr != NULL) {
+        memset(ptr, 0, nmemb * size);
+    }
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    ptr = __real__calloc_r(r, nmemb, size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_calloc(ptr, nmemb, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return ptr;
+}
+
+
+/******************************************************************************/
+/* ARMCC memory allocation wrappers                                           */
+/******************************************************************************/
+
+#elif defined(TOOLCHAIN_ARM) // #if defined(TOOLCHAIN_GCC)
+
+/* Enable hooking of memory function only if tracing is also enabled */
+#if defined(MBED_MEM_TRACING_ENABLED) || defined(MBED_HEAP_STATS_ENABLED)
+
+extern "C" {
+    void *$Super$$malloc(size_t size);
+    void *$Super$$realloc(void *ptr, size_t size);
+    void *$Super$$calloc(size_t nmemb, size_t size);
+    void $Super$$free(void *ptr);
+}
+
+extern "C" void* $Sub$$malloc(size_t size) {
+    void *ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    malloc_stats_mutex->lock();
+    alloc_info_t *alloc_info = (alloc_info_t*)$Super$$malloc(size + sizeof(alloc_info_t));
+    if (alloc_info != NULL) {
+        alloc_info->size = size;
+        ptr = (void*)(alloc_info + 1);
+        heap_stats.current_size += size;
+        heap_stats.total_size += size;
+        heap_stats.alloc_cnt += 1;
+        if (heap_stats.current_size > heap_stats.max_size) {
+            heap_stats.max_size = heap_stats.current_size;
+        }
+    } else {
+        heap_stats.alloc_fail_cnt += 1;
+    }
+    malloc_stats_mutex->unlock();
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    ptr = $Super$$malloc(size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_malloc(ptr, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return ptr;
+}
+
+extern "C" void* $Sub$$realloc(void *ptr, size_t size) {
+    void *new_ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    // Note - no lock needed since malloc and free are thread safe
+
+    // Get old size
+    uint32_t old_size = 0;
+    if (ptr != NULL) {
+        alloc_info_t *alloc_info = ((alloc_info_t*)ptr) - 1;
+        old_size = alloc_info->size;
+    }
+
+    // Allocate space
+    if (size != 0) {
+        new_ptr = malloc(size);
+    }
+
+    // If the new buffer has been allocated copy the data to it
+    // and free the old buffer
+    if (new_ptr != NULL) {
+        uint32_t copy_size = (old_size < size) ? old_size : size;
+        memcpy(new_ptr, (void*)ptr, copy_size);
+        free(ptr);
+    }
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    new_ptr = $Super$$realloc(ptr, size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_realloc(new_ptr, ptr, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return new_ptr;
+}
+
+extern "C" void *$Sub$$calloc(size_t nmemb, size_t size) {
+    void *ptr = NULL;
+#ifdef MBED_HEAP_STATS_ENABLED
+    // Note - no lock needed since malloc is thread safe
+    ptr = malloc(nmemb * size);
+    if (ptr != NULL) {
+        memset(ptr, 0, nmemb * size);
+    }
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    ptr = $Super$$calloc(nmemb, size);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_calloc(ptr, nmemb, size, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+    return ptr;
+}
+
+extern "C" void $Sub$$free(void *ptr) {
+#ifdef MBED_HEAP_STATS_ENABLED
+    malloc_stats_mutex->lock();
+    alloc_info_t *alloc_info = NULL;
+    if (ptr != NULL) {
+        alloc_info = ((alloc_info_t*)ptr) - 1;
+        heap_stats.current_size -= alloc_info->size;
+        heap_stats.alloc_cnt -= 1;
+    }
+    $Super$$free((void*)alloc_info);
+    malloc_stats_mutex->unlock();
+#else // #ifdef MBED_HEAP_STATS_ENABLED
+    $Super$$free(ptr);
+#endif // #ifdef MBED_HEAP_STATS_ENABLED
+#ifdef MBED_MEM_TRACING_ENABLED
+    mem_trace_mutex->lock();
+    mbed_mem_trace_free(ptr, MBED_CALLER_ADDR());
+    mem_trace_mutex->unlock();
+#endif // #ifdef MBED_MEM_TRACING_ENABLED
+}
+
+#endif // #if defined(MBED_MEM_TRACING_ENABLED) || defined(MBED_HEAP_STATS_ENABLED)
+
+/******************************************************************************/
+/* Allocation wrappers for other toolchains are not supported yet             */
+/******************************************************************************/
+
+#else // #if defined(TOOLCHAIN_GCC)
+
+#ifdef MBED_MEM_TRACING_ENABLED
+#warning Memory tracing is not supported with the current toolchain.
+#endif
+
+#ifdef MBED_HEAP_STATS_ENABLED
+#warning Heap statistics are not supported with the current toolchain.
+#endif
+
+#endif // #if defined(TOOLCHAIN_GCC)
+