stats - Added stack stats api

Matched heap stats api
- void mbed_stats_heap_get(mbed_stats_heap_t *)
- void mbed_stats_stack_get(mbed_stats_stack_t *)

platform/mbed_stats.c

@@ -0,0 +1,37 @@
+#include "mbed_stats.h"
+#include <string.h>
+
+#if MBED_CONF_RTOS_PRESENT
+#include "cmsis_os.h"
+#endif
+
+// note: mbed_stats_heap_get defined in mbed_alloc_wrappers.cpp
+
+void mbed_stats_stack_get(mbed_stats_stack_t *stats)
+{
+    memset(stats, 0, sizeof(mbed_stats_stack_t));
+
+#if MBED_STACK_STATS_ENABLED && MBED_CONF_RTOS_PRESENT
+    osThreadEnumId enumid = _osThreadsEnumStart();
+    osThreadId threadid;
+
+    while ((threadid = _osThreadEnumNext(enumid))) {
+        osEvent e;
+
+        e = _osThreadGetInfo(threadid, osThreadInfoStackMax);
+        if (e.status == osOK) {
+           stats->max_size += (uint32_t)e.value.p;
+        }
+
+        e = _osThreadGetInfo(threadid, osThreadInfoStackSize);
+        if (e.status == osOK) {
+           stats->reserved_size += (uint32_t)e.value.p;
+        }
+
+        stats->stack_cnt += 1;
+    }
+#elif MBED_STACK_STATS_ENABLED
+#warning Stack statistics are not supported without the rtos.
+#endif
+}
+

platform/mbed_stats.h

@@ -18,6 +18,7 @@
  */
 #ifndef MBED_STATS_H
 #define MBED_STATS_H
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -36,6 +37,17 @@ typedef struct {
  */
 void mbed_stats_heap_get(mbed_stats_heap_t *stats);
 
+typedef struct {
+    uint32_t max_size;          /**< Sum of the maximum number of bytes used in each stack. */
+    uint32_t reserved_size;     /**< Current number of bytes allocated for all stacks. */
+    uint32_t stack_cnt;         /**< Number of stacks currently allocated. */
+} mbed_stats_stack_t;
+
+/**
+ * Fill the passed in structure with stack stats.
+ */
+void mbed_stats_stack_get(mbed_stats_stack_t *stats);
+
 #ifdef __cplusplus
 }
 #endif