Diff: platform/mbed_mem_trace.cpp

Revision:

180:96ed750bd169

Child:

187:0387e8f68319

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbed_mem_trace.cpp	Wed Jan 17 15:23:54 2018 +0000
@@ -0,0 +1,129 @@
+/* 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 <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include "platform/mbed_mem_trace.h"
+#include "platform/mbed_critical.h"
+#include "platform/SingletonPtr.h"
+#include "platform/PlatformMutex.h"
+
+/******************************************************************************
+ * Internal variables, functions and helpers
+ *****************************************************************************/
+
+/* The callback function that will be called after a traced memory operations finishes. */
+static mbed_mem_trace_cb_t mem_trace_cb;
+/* 'trace_lock_count' guards "trace inside trace" situations (for example, the implementation
+ * of realloc() might call malloc() internally, and since malloc() is also traced, this could
+ * result in two calls to the callback function instead of one. */
+static uint8_t trace_lock_count;
+static SingletonPtr<PlatformMutex> mem_trace_mutex;
+
+#define TRACE_FIRST_LOCK() (trace_lock_count < 2)
+
+
+/******************************************************************************
+ * Public interface
+ *****************************************************************************/
+
+void mbed_mem_trace_set_callback(mbed_mem_trace_cb_t cb) {
+    mem_trace_cb = cb;
+}
+
+void mbed_mem_trace_lock()
+{
+    mem_trace_mutex->lock();
+    trace_lock_count++;
+}
+
+void mbed_mem_trace_unlock()
+{
+    trace_lock_count--;
+    mem_trace_mutex->unlock();
+}
+
+void *mbed_mem_trace_malloc(void *res, size_t size, void *caller) {
+    if (mem_trace_cb) {
+        if (TRACE_FIRST_LOCK()) {
+            mem_trace_cb(MBED_MEM_TRACE_MALLOC, res, caller, size);
+        }
+    }
+    return res;
+}
+
+void *mbed_mem_trace_realloc(void *res, void *ptr, size_t size, void *caller) {
+    if (mem_trace_cb) {
+        if (TRACE_FIRST_LOCK()) {
+            mem_trace_cb(MBED_MEM_TRACE_REALLOC, res, caller, ptr, size);
+        }
+    }
+    return res;
+}
+
+void *mbed_mem_trace_calloc(void *res, size_t num, size_t size, void *caller) {
+    if (mem_trace_cb) {
+        if (TRACE_FIRST_LOCK()) {
+            mem_trace_cb(MBED_MEM_TRACE_CALLOC, res, caller, num, size);
+        }
+    }
+    return res;
+}
+
+void mbed_mem_trace_free(void *ptr, void *caller) {
+    if (mem_trace_cb) {
+        if (TRACE_FIRST_LOCK()) {
+            mem_trace_cb(MBED_MEM_TRACE_FREE, NULL, caller, ptr);
+        }
+    }
+}
+
+void mbed_mem_trace_default_callback(uint8_t op, void *res, void *caller, ...) {
+    va_list va;
+    size_t temp_s1, temp_s2;
+    void *temp_ptr;
+
+    va_start(va, caller);
+    switch(op) {
+        case MBED_MEM_TRACE_MALLOC:
+            temp_s1 = va_arg(va, size_t);
+            printf(MBED_MEM_DEFAULT_TRACER_PREFIX "m:%p;%p-%u\n", res, caller, temp_s1);
+            break;
+
+        case MBED_MEM_TRACE_REALLOC:
+            temp_ptr = va_arg(va, void*);
+            temp_s1 = va_arg(va, size_t);
+            printf(MBED_MEM_DEFAULT_TRACER_PREFIX "r:%p;%p-%p;%u\n", res, caller, temp_ptr, temp_s1);
+            break;
+
+        case MBED_MEM_TRACE_CALLOC:
+            temp_s1 = va_arg(va, size_t);
+            temp_s2 = va_arg(va, size_t);
+            printf(MBED_MEM_DEFAULT_TRACER_PREFIX "c:%p;%p-%u;%u\n", res, caller, temp_s1, temp_s2);
+            break;
+
+        case MBED_MEM_TRACE_FREE:
+            temp_ptr = va_arg(va, void*);
+            printf(MBED_MEM_DEFAULT_TRACER_PREFIX "f:%p;%p-%p\n", res, caller, temp_ptr);
+            break;
+
+        default:
+            printf("?\n");
+    }
+    va_end(va);
+}
+