Update the RegExp constructor to ECMA-262 v6 (#3538)

The following methods have been implemented:
- RegExpAlloc, based on ECMA-262 v6, 21.2.3.2.1
- RegExpInitialize, based on ECMA-262 v6, 22.2.3.2.2
- RegExpCreate, based on ECMA-262 v6, 21.2.3.2.3

Co-authored-by: Robert Fancsik frobert@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

jerry-core/ecma/base/ecma-gc.c

@@ -1106,17 +1106,24 @@ ecma_gc_free_object (ecma_object_t *object_p) /**< object to free */
           ecma_dealloc_number (num_p);
           break;
         }
-
+#if ENABLED (JERRY_ES2015)
+        case LIT_INTERNAL_MAGIC_STRING_REGEXP_PROTO:
+        {
+          jmem_heap_free_block (ECMA_GET_INTERNAL_VALUE_POINTER (void, ext_object_p->u.class_prop.u.value),
+                                ECMA_REGEXP_PROTO_COMPILED_CODE_SIZE);
+          break;
+        }
+#endif /* ENABLED (JERRY_ES2015) */
         case LIT_MAGIC_STRING_REGEXP_UL:
         {
-          ecma_compiled_code_t *bytecode_p;
-          bytecode_p = ECMA_GET_INTERNAL_VALUE_ANY_POINTER (ecma_compiled_code_t,
-                                                            ext_object_p->u.class_prop.u.value);
+          ecma_compiled_code_t *bytecode_p = ECMA_GET_INTERNAL_VALUE_ANY_POINTER (ecma_compiled_code_t,
+                                                                                  ext_object_p->u.class_prop.u.value);
 
           if (bytecode_p != NULL)
           {
             ecma_bytecode_deref (bytecode_p);
           }
+
           break;
         }
 #if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)

jerry-core/ecma/base/ecma-globals.h

@@ -940,6 +940,13 @@ typedef struct
                                      *   If regexp, the other flags must be RE_FLAG... */
 } ecma_compiled_code_t;
 
+/**
+ * The proper memory size for the RegExp.prototype. We have to align the header's size manually, because
+ * in the struct, it is aligned to 8 bytes during the compilation.
+ */
+#define ECMA_REGEXP_PROTO_COMPILED_CODE_SIZE \
+  (JERRY_ALIGNUP (sizeof (ecma_compiled_code_t), JMEM_ALIGNMENT) + sizeof (ecma_value_t))
+
 #if ENABLED (JERRY_SNAPSHOT_EXEC)
 
 /**

jerry-core/ecma/base/ecma-helpers.c

@@ -1494,6 +1494,28 @@ ecma_compiled_code_get_tagged_template_collection (const ecma_compiled_code_t *b
 } /* ecma_compiled_code_get_tagged_template_collection */
 #endif /* ENABLED (JERRY_ES2015) */
 
+/**
+ * Helper function to check if the given value is a class
+ *
+ * @return pointer to the extended object - if 'this' is a class
+ *         NULL- otherwise
+ */
+ecma_extended_object_t *
+ecma_op_check_object_type_is_class (ecma_value_t this)  /**< this value */
+{
+  if (ecma_is_value_object (this))
+  {
+    ecma_object_t *obj_p = ecma_get_object_from_value (this);
+
+    if (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_CLASS)
+    {
+      return (ecma_extended_object_t *) obj_p;
+    }
+  }
+
+  return NULL;
+} /* ecma_op_check_object_type_is_class */
+
 #if ENABLED (JERRY_LINE_INFO) || ENABLED (JERRY_ES2015_MODULE_SYSTEM) || ENABLED (JERRY_ES2015)
 /**
  * Get the number of formal parameters of the compiled code

jerry-core/ecma/base/ecma-helpers.h

@@ -430,6 +430,7 @@ uint8_t ecma_get_object_builtin_id (ecma_object_t *object_p);
 ecma_lexical_environment_type_t JERRY_ATTR_PURE ecma_get_lex_env_type (const ecma_object_t *object_p);
 ecma_object_t JERRY_ATTR_PURE *ecma_get_lex_env_binding_object (const ecma_object_t *object_p);
 ecma_object_t *ecma_clone_decl_lexical_environment (ecma_object_t *lex_env_p, bool copy_values);
+ecma_extended_object_t *ecma_op_check_object_type_is_class (ecma_value_t this);
 
 ecma_property_value_t *
 ecma_create_named_data_property (ecma_object_t *object_p, ecma_string_t *name_p, uint8_t prop_attributes,