Deserialize annotations on class members

Make 'Callable' message of descriptors.proto extensible, extend it in
java_descriptors.proto with a JVM signature of the member. This is needed in
order for annotation deserializer to find out which member in the compiled
bytecode corresponds to which descriptor in the hierarchy.

Create a new module 'serialization.java' containing everything related to
Java-specific serialization of descriptors.

Add an extension point to DescriptorSerializer, allowing to perform
platform-specific serialization on a callable

compiler/frontend.java/serialization.java/src/java_descriptors.proto

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+package org.jetbrains.jet.descriptors.serialization;
+
+import "compiler/frontend/serialization/src/descriptors.proto";
+
+option java_outer_classname = "JavaProtoBuf";
+option optimize_for = LITE_RUNTIME;
+
+extend Callable {
+  optional string java_signature = 100;
+}

compiler/frontend.java/serialization.java/src/org/jetbrains/jet/descriptors/serialization/JavaProtoBuf.java

@@ -0,0 +1,29 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: compiler/frontend.java/serialization.java/src/java_descriptors.proto
+
+package org.jetbrains.jet.descriptors.serialization;
+
+public final class JavaProtoBuf {
+  private JavaProtoBuf() {}
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistryLite registry) {
+    registry.add(org.jetbrains.jet.descriptors.serialization.JavaProtoBuf.javaSignature);
+  }
+  public static final int JAVA_SIGNATURE_FIELD_NUMBER = 100;
+  public static final
+    com.google.protobuf.GeneratedMessageLite.GeneratedExtension<
+      org.jetbrains.jet.descriptors.serialization.ProtoBuf.Callable,
+      java.lang.String> javaSignature = com.google.protobuf.GeneratedMessageLite
+          .newSingularGeneratedExtension(
+        org.jetbrains.jet.descriptors.serialization.ProtoBuf.Callable.getDefaultInstance(),
+        "",
+        null,
+        null,
+        100,
+        com.google.protobuf.WireFormat.FieldType.STRING);
+  
+  static {
+  }
+  
+  // @@protoc_insertion_point(outer_class_scope)
+}

compiler/frontend.java/serialization.java/src/org/jetbrains/jet/descriptors/serialization/JavaProtoBufUtil.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+package org.jetbrains.jet.descriptors.serialization;
+
+import com.google.protobuf.ExtensionRegistryLite;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import static org.jetbrains.jet.descriptors.serialization.JavaProtoBuf.javaSignature;
+
+public class JavaProtoBufUtil {
+    private JavaProtoBufUtil() {
+    }
+
+    @Nullable
+    public static String loadJavaSignature(@NotNull ProtoBuf.Callable callable) {
+        return callable.hasExtension(javaSignature) ? callable.getExtension(javaSignature) : null;
+    }
+
+    public static void saveJavaSignature(@NotNull ProtoBuf.Callable.Builder callable, @NotNull String signature) {
+        callable.setExtension(javaSignature, signature);
+    }
+
+    @NotNull
+    public static ClassData readJavaClassDataFrom(@NotNull byte[] data) {
+        ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
+        JavaProtoBuf.registerAllExtensions(registry);
+        return ClassData.read(data, registry);
+    }
+}