Add API for get the memory stats (#1923)

JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com

jerry-core/include/jerryscript-core.h

@@ -158,6 +158,19 @@ typedef struct
   jerry_value_t setter;
 } jerry_property_descriptor_t;
 
+/**
+ * Description of JerryScript heap memory stats.
+ * It is for memory profiling.
+ */
+typedef struct
+{
+  size_t version; /**< the version of the stats struct */
+  size_t size; /**< heap total size */
+  size_t allocated_bytes; /**< currently allocated bytes */
+  size_t peak_allocated_bytes; /**< peak allocated bytes */
+  size_t reserved[4]; /**< padding for future extensions */
+} jerry_heap_stats_t;
+
 /**
  * Type of an external function handler.
  */
@@ -235,6 +248,8 @@ void jerry_get_memory_limits (size_t *out_data_bss_brk_limit_p, size_t *out_stac
 void jerry_gc (void);
 void *jerry_get_context_data (const jerry_context_data_manager_t *manager_p);
 
+bool jerry_get_memory_stats (jerry_heap_stats_t *out_stats_p);
+
 /**
  * Parser and executor functions.
  */