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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: seongkim@google.com (Seong Beom Kim)
+//
+// protoc (Protocol Compiler) can generate more efficient code
+// if it knows how a workload accesses fields of a message;
+// e.g. some much more frequently than others.
+//
+// Protos defined here describe the access information per message
+// and per field. Note that one can use any methods to collect
+// the access patterns like CPU profiling, instrumented build, etc.
+
+syntax = "proto2";
+
+package google.protobuf.compiler;
+
+// To convey the access pattern of a field, it classifies
+// the type of the accessor methods into getters, setters and
+// configs. Getters and setters read and write the field
+// respectively and other operations like checking if the field
+// exists are considered as configs.
+message FieldAccessInfo {
+  optional string name = 1;
+  optional uint64 getters_count = 2;
+  optional uint64 setters_count = 3;
+  optional uint64 configs_count = 4;
+}
+
+// "count" correlates with how many samples an access info has
+// for a message. High "count" means more confident optimization
+// based on the info.
+message MessageAccessInfo {
+  optional string name = 1;
+  optional uint64 count = 2;
+  repeated FieldAccessInfo field = 3;
+}
+
+message AccessInfo {
+  repeated MessageAccessInfo message = 1;
+}