Introducing ECMA property descriptor (8.10) type and helpers for it: constructor and destructor.

src/libecmaobjects/ecma-globals.h

@@ -189,7 +189,51 @@ typedef enum
 } ecma_property_configurable_value_t;
 
 /**
- * Description of ecma-property.
+ * Description of ECMA property descriptor
+ *
+ * See also: ECMA-262 v5, 8.10.
+ */
+typedef struct
+{
+  /** Is [[Value]] defined? */
+  unsigned int is_value_defined : 1;
+
+  /** Is [[Get]] defined? */
+  unsigned int is_get_defined : 1;
+
+  /** Is [[Set]] defined? */
+  unsigned int is_set_defined : 1;
+
+  /** Is [[Writable]] defined? */
+  unsigned int is_writable_defined : 1;
+
+  /** Is [[Enumerable]] defined? */
+  unsigned int is_enumerable_defined : 1;
+
+  /** Is [[Configurable]] defined? */
+  unsigned int is_configurable_defined : 1;
+
+  /** [[Value]] */
+  ecma_value_t value;
+
+  /** [[Get]] */
+  ecma_value_t get;
+
+  /** [[Set]] */
+  ecma_value_t set;
+
+  /** [[Writable]] */
+  ecma_property_writable_value_t writable;
+
+  /** [[Enumerable]] */
+  ecma_property_enumerable_value_t enumerable;
+
+  /** [[Configurable]] */
+  ecma_property_configurable_value_t configurable;
+} ecma_property_descriptor_t;
+
+/**
+ * Description of ecma-property
  */
 typedef struct ecma_property_t {
     /** Property's type (ecma_property_type_t) */