Add ArrayBuffer detach operations (#3208)

JerryScript-DCO-1.0-Signed-off-by: legendecas legendecas@gmail.com
2019-10-16 22:41:27 +08:00
parent 09c5d98e25
commit 2e86bdae6f
11 changed files with 375 additions and 2 deletions
@@ -203,6 +203,79 @@ ecma_arraybuffer_get_buffer (ecma_object_t *object_p) /**< pointer to the ArrayB
  }
 } /* ecma_arraybuffer_get_buffer */

+/**
+ * Helper function: check if the target ArrayBuffer is detached
+ *
+ * @return true - if value is an detached ArrayBuffer object
+ *         false - otherwise
+ */
+inline bool JERRY_ATTR_PURE JERRY_ATTR_ALWAYS_INLINE
+ecma_arraybuffer_is_detached (ecma_object_t *object_p) /**< pointer to the ArrayBuffer object */
+{
+  JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
+
+  ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
+
+  if (ECMA_ARRAYBUFFER_HAS_EXTERNAL_MEMORY (ext_object_p))
+  {
+    ecma_arraybuffer_external_info *array_p = (ecma_arraybuffer_external_info *) ext_object_p;
+    /* in case the arraybuffer has been detached */
+    return array_p->buffer_p == NULL;
+  }
+
+  return false;
+} /* ecma_arraybuffer_is_detached */
+
+/**
+ * Helper function: check if the target ArrayBuffer is detachable
+ *
+ * @return true - if value is an detachable ArrayBuffer object
+ *         false - otherwise
+ */
+inline bool JERRY_ATTR_PURE JERRY_ATTR_ALWAYS_INLINE
+ecma_arraybuffer_is_detachable (ecma_object_t *object_p) /**< pointer to the ArrayBuffer object */
+{
+  JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
+
+  ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
+
+  if (ECMA_ARRAYBUFFER_HAS_EXTERNAL_MEMORY (ext_object_p))
+  {
+    ecma_arraybuffer_external_info *array_p = (ecma_arraybuffer_external_info *) ext_object_p;
+    /* in case the arraybuffer has been detached */
+    return array_p->buffer_p != NULL;
+  }
+
+  return false;
+} /* ecma_arraybuffer_is_detachable */
+
+/**
+ * ArrayBuffer object detaching operation
+ *
+ * See also: ES2015 24.1.1.3
+ *
+ * @return true - if detach op succeeded
+ *         false - otherwise
+ */
+inline bool JERRY_ATTR_ALWAYS_INLINE
+ecma_arraybuffer_detach (ecma_object_t *object_p) /**< pointer to the ArrayBuffer object */
+{
+  JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
+
+  if (!ecma_arraybuffer_is_detachable (object_p))
+  {
+    return false;
+  }
+
+  ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
+
+  ecma_arraybuffer_external_info *array_object_p = (ecma_arraybuffer_external_info *) ext_object_p;
+  array_object_p->buffer_p = NULL;
+  array_object_p->extended_object.u.class_prop.u.length = 0;
+
+  return true;
+} /* ecma_arraybuffer_detach */
+
 /**
 * @}
 * @}