Extension description syntax; extension instantiation, field values and calls with arguments (except strings); example of a simple extension.

String arguments support is supposed to be added in a subsequent commit.

jerry-core/ecma/builtin-objects/ecma-extension.h

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+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * 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_EXTENSION_H
+#define ECMA_EXTENSION_H
+
+#include "ecma-globals.h"
+#include "jerry-extension.h"
+
+/**
+ * Maximum number of registered extensions
+ */
+#define ECMA_EXTENSION_MAX_NUMBER_OF_EXTENSIONS (CONFIG_EXTENSION_MAX_NUMBER_OF_EXTENSIONS)
+
+/**
+ * Maximum number of functions in an extension
+ */
+#define ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION (CONFIG_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION)
+
+/**
+ * Maximum number of arguments in a function
+ */
+#define ECMA_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION (CONFIG_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION)
+
+extern bool ecma_extension_register (jerry_extension_descriptor_t *extension_desc_p);
+extern ecma_property_t* ecma_op_extension_object_get_own_property (ecma_object_t*, ecma_string_t*);
+
+#endif /* ECMA_EXTENSION_H */