Delete some globals in ShutdownProtobufLibrary().

src/google/protobuf/descriptor.cc

@@ -345,6 +345,10 @@ typedef hash_map<string, const SourceCodeInfo_Location*> LocationsByPathMap;
 set<string>* allowed_proto3_extendees_ = NULL;
 GOOGLE_PROTOBUF_DECLARE_ONCE(allowed_proto3_extendees_init_);
 
+void DeleteAllowedProto3Extendee() {
+  delete allowed_proto3_extendees_;
+}
+
 void InitAllowedProto3Extendee() {
   allowed_proto3_extendees_ = new set<string>;
   allowed_proto3_extendees_->insert("google.protobuf.FileOptions");
@@ -354,6 +358,7 @@ void InitAllowedProto3Extendee() {
   allowed_proto3_extendees_->insert("google.protobuf.EnumValueOptions");
   allowed_proto3_extendees_->insert("google.protobuf.ServiceOptions");
   allowed_proto3_extendees_->insert("google.protobuf.MethodOptions");
+  google::protobuf::internal::OnShutdown(&DeleteAllowedProto3Extendee);
 }
 
 // Checks whether the extendee type is allowed in proto3.

src/google/protobuf/map_entry.h

@@ -43,6 +43,10 @@ class Arena;
 namespace protobuf {
 namespace internal {
 
+// Register all MapEntry default instances so we can delete them in
+// ShutdownProtobufLibrary().
+void RegisterMapEntryDefaultInstance(MessageLite* default_instance);
+
 // This is the common base class for MapEntry. It is used by MapFieldBase in
 // reflection api, in which the static type of key and value is unknown.
 class LIBPROTOBUF_EXPORT MapEntryBase : public Message {
@@ -317,6 +321,7 @@ class LIBPROTOBUF_EXPORT MapEntry : public MapEntryBase {
     entry->reflection_ = reflection;
     entry->default_instance_ = entry;
     entry->InitAsDefaultInstance();
+    RegisterMapEntryDefaultInstance(entry);
     return entry;
   }
 

src/google/protobuf/map_field.cc

@@ -30,10 +30,37 @@
 
 #include <google/protobuf/map_field.h>
 
+#include <vector>
+
 namespace google {
 namespace protobuf {
 namespace internal {
 
+ProtobufOnceType map_entry_default_instances_once_;
+Mutex* map_entry_default_instances_mutex_;
+vector<MessageLite*>* map_entry_default_instances_;
+
+void DeleteMapEntryDefaultInstances() {
+  for (int i = 0; i < map_entry_default_instances_->size(); ++i) {
+    delete map_entry_default_instances_->at(i);
+  }
+  delete map_entry_default_instances_mutex_;
+  delete map_entry_default_instances_;
+}
+
+void InitMapEntryDefaultInstances() {
+  map_entry_default_instances_mutex_ = new Mutex();
+  map_entry_default_instances_ = new vector<MessageLite*>();
+  OnShutdown(&DeleteMapEntryDefaultInstances);
+}
+
+void RegisterMapEntryDefaultInstance(MessageLite* default_instance) {
+  GoogleOnceInit(&map_entry_default_instances_once_,
+                 &InitMapEntryDefaultInstances);
+  MutexLock lock(map_entry_default_instances_mutex_);
+  map_entry_default_instances_->push_back(default_instance);
+}
+
 MapFieldBase::~MapFieldBase() {
   if (repeated_field_ != NULL) delete repeated_field_;
 }