Add property name hashing support.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2016-04-20 03:38:43 -07:00
parent 02ba19f24d
commit a3b1db3638
7 changed files with 731 additions and 29 deletions
@@ -0,0 +1,70 @@
+/* Copyright 2016 Samsung Electronics Co., Ltd.
+ * Copyright 2016 University of Szeged.
+ *
+ * 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.
+ */
+
+#ifndef ECMA_PROPERTY_HASHMAP_H
+#define ECMA_PROPERTY_HASHMAP_H
+
+/** \addtogroup ecma ECMA
+ * @{
+ *
+ * \addtogroup ecmapropertyhashmap Property hashmap
+ * @{
+ */
+
+/**
+ * Recommended minimum number of items in a property cache.
+ */
+#define ECMA_PROPERTY_HASMAP_MINIMUM_SIZE 32
+
+/**
+ * Property hash.
+ */
+typedef struct
+{
+  ecma_property_header_t header; /**< header of the property */
+  uint32_t max_property_count; /**< maximum property count (power of 2) */
+  uint32_t null_count; /**< number of NULLs in the map */
+
+  /*
+   * The hash is followed by max_property_count ecma_cpointer_t
+   * compressed pointers and (max_property_count + 7) / 8 bytes
+   * which stores a flag for each compressed pointer.
+   *
+   * If the compressed pointer is equal to ECMA_NULL_POINTER
+   *   - flag is cleared if the entry is NULL
+   *   - flag is set if the entry is deleted
+   *
+   * If the compressed pointer is not equal to ECMA_NULL_POINTER
+   *   - flag is cleared if the first entry of a property pair is referenced
+   *   - flag is set if the second entry of a property pair is referenced
+   */
+} ecma_property_hashmap_t;
+
+extern void ecma_property_hashmap_create (ecma_object_t *);
+extern void ecma_property_hashmap_free (ecma_object_t *);
+extern void ecma_property_hashmap_insert (ecma_object_t *, ecma_string_t *, ecma_property_pair_t *, int);
+extern void ecma_property_hashmap_delete (ecma_object_t *, ecma_string_t *, ecma_property_t *);
+
+#ifndef CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE
+extern ecma_property_t *ecma_property_hashmap_find (ecma_property_hashmap_t *, ecma_string_t *);
+#endif /* !CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE */
+
+/**
+ * @}
+ * @}
+ */
+
+#endif /* !ECMA_PROPERTY_HASHMAP_H */