Set up for verified lazy extensions. (Disabled by default.)

PiperOrigin-RevId: 555581396

src/google/protobuf/extension_set_heavy.cc

@@ -38,6 +38,7 @@
 #include <vector>
 
 #include "google/protobuf/arena.h"
+#include "absl/log/absl_check.h"
 #include "google/protobuf/descriptor.h"
 #include "google/protobuf/descriptor.pb.h"
 #include "google/protobuf/extension_set.h"
@@ -325,6 +326,7 @@ bool ExtensionSet::FindExtension(int wire_type, uint32_t field,
   return true;
 }
 
+
 const char* ExtensionSet::ParseField(uint64_t tag, const char* ptr,
                                      const Message* extendee,
                                      internal::InternalMetadata* metadata,

src/google/protobuf/unittest_extension_set.proto

@@ -0,0 +1,51 @@
+// 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: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// This file contains messages for testing extensions.
+
+syntax = "proto2";
+
+package protobuf_unittest;
+
+option optimize_for = SPEED;
+option csharp_namespace = "Google.ProtocolBuffers.TestProtos";
+
+// A message with message_set_wire_format.
+message TestExtensionSet {
+  extensions 4 to max;
+}
+
+message TestExtensionSetContainer {
+  optional TestExtensionSet extension = 1;
+}