1 files changed, 160 insertions, 0 deletions
diff --git a/extras/japi/java/jvpp/gen/jvppgen/jni_gen.py b/extras/japi/java/jvpp/gen/jvppgen/jni_gen.py
new file mode 100755
index 00000000000..ad6c2614062
--- /dev/null
+++ b/extras/japi/java/jvpp/gen/jvppgen/jni_gen.py
@@ -0,0 +1,160 @@
+#!/usr/bin/env python2
+#
+# Copyright (c) 2016,2018 Cisco and/or its affiliates.
+# 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.
+#
+from string import Template
+
+from jni_impl_gen import generate_jni_impl
+from jni_msg_handlers_gen import generate_jni_handlers
+from jni_type_handlers_gen import generate_type_handlers
+from jvpp_model import is_control_ping, is_dump, is_request, is_control_ping_reply
+
+
+def generate_jni(work_dir, model, logger):
+    logger.debug("Generating jvpp C for %s" % model.json_api_files)
+    plugin_name = model.plugin_name
+    messages = model.messages
+
+    with open("%s/jvpp_%s_gen.h" % (work_dir, plugin_name), "w") as f:
+        f.write(_JVPP_C_TEMPLATE.substitute(
+            json_filename=model.json_api_files,
+            class_cache=_generate_class_cache(plugin_name, messages),
+            api_verification=_generate_api_verification(messages),
+            type_handlers=generate_type_handlers(model, logger),
+            jni_implementations=generate_jni_impl(model),
+            msg_handlers=generate_jni_handlers(model),
+            handler_registration=_generate_handler_registration(messages)))
+
+_JVPP_C_TEMPLATE = Template("""/**
+ * This file contains JNI bindings for jvpp Java API.
+ * It was generated by jvpp_jni_gen.py based on $json_filename.
+ */
+$class_cache
+
+$api_verification
+
+// Type handlers
+$type_handlers
+
+// JNI bindings
+$jni_implementations
+
+// Message handlers
+$msg_handlers
+
+$handler_registration
+""")
+
+
+def _generate_class_cache(plugin_name, messages):
+    references = []
+    for msg in messages:
+        if is_control_ping(msg) or is_control_ping_reply(msg):
+            # Skip control_ping managed by jvpp registry.
+            continue
+        references.append((
+            msg.java_name_lower,
+            'io/fd/vpp/jvpp/%s/dto/%s' % (plugin_name, msg.java_name_upper)
+        ))
+
+    references.append(('callbackException', 'io/fd/vpp/jvpp/VppCallbackException'))
+
+    return _CLASS_CACHE_TEMPLATE.substitute(
+        class_references=_generate_class_references(references),
+        create_references=_generate_create_references(references),
+        delete_references=_generate_delete_references(references)
+    )
+
+_CLASS_CACHE_TEMPLATE = Template("""
+// JAVA class reference cache
+$class_references
+
+static int cache_class_references(JNIEnv* env) {
+$create_references
+    return 0;
+}
+
+static void delete_class_references(JNIEnv* env) {
+$delete_references
+}""")
+
+
+def _generate_class_references(references):
+    return "\n".join("jclass %sClass;" % r[0] for r in references)
+
+
+def _generate_create_references(references):
+    items = []
+    for r in references:
+        items.append(_CREATE_GLOBAL_REF_TEMPLATE.substitute(
+            ref_name=r[0],
+            fqn_name=r[1]
+        ))
+    return "".join(items)
+
+_CREATE_GLOBAL_REF_TEMPLATE = Template("""
+    ${ref_name}Class = (jclass)(*env)->NewGlobalRef(env, (*env)->FindClass(env, "${fqn_name}"));
+    if ((*env)->ExceptionCheck(env)) {
+        (*env)->ExceptionDescribe(env);
+        return JNI_ERR;
+    }""")
+
+
+def _generate_delete_references(references):
+    items = []
+    for r in references:
+        items.append(_DELETE_CLASS_INVOCATION_TEMPLATE.substitute(ref_name=r[0]))
+    return "".join(items)
+
+_DELETE_CLASS_INVOCATION_TEMPLATE = Template("""
+    if (${ref_name}Class) {
+        (*env)->DeleteGlobalRef(env, ${ref_name}Class);
+    }""")
+
+
+def _generate_api_verification(messages):
+    items = []
+    for msg in messages:
+        items.append("_(%s_%s) \\" % (msg.name, msg.crc))
+    return _API_VERIFICATION_TEMPLATE.substitute(messages="\n".join(items))
+
+_API_VERIFICATION_TEMPLATE = Template("""
+// List of supported API messages used for verification
+#define foreach_supported_api_message \\
+$messages
+""")
+
+
+def _generate_handler_registration(messages):
+    """
+    Generates msg handler registration for all messages except for dumps and requests.
+    :param messages: collection of VPP API messages.
+    """
+    handlers = []
+    for msg in messages:
+        if is_control_ping(msg) or is_control_ping_reply(msg):
+            # Skip control_ping managed by jvpp registry.
+            continue
+        if is_dump(msg) or is_request(msg):
+            continue
+        name = msg.name
+        crc = msg.crc
+        handlers.append("_(%s_%s, %s) \\" % (name, crc, name))
+    return _HANDLER_REGISTRATION_TEMPLATE.substitute(handlers="\n".join(handlers))
+
+_HANDLER_REGISTRATION_TEMPLATE = Template("""
+// Registration of message handlers in vlib
+#define foreach_api_reply_handler \\
+$handlers
+""")