Adding some helper functions for testing file options.

src/compiler/objc_helpers.h

@@ -20,6 +20,7 @@
 
 #include <string>
 #include <google/protobuf/descriptor.h>
+#include <google/protobuf/descriptor.pb.h>
 
 namespace google {
 namespace protobuf {
@@ -105,6 +106,22 @@ string BoxValue(const FieldDescriptor* field, const string& value);
 
 const char* GetArrayValueType(const FieldDescriptor* field);
 
+// Do message classes in this file keep track of unknown fields?
+inline bool HasUnknownFields(const FileDescriptor *file) {
+  return file->options().optimize_for() != FileOptions::LITE_RUNTIME;
+}
+
+// Does this file have generated parsing, serialization, and other
+// standard methods for which reflection-based fallback implementations exist?
+inline bool HasGeneratedMethods(const FileDescriptor *file) {
+  return file->options().optimize_for() != FileOptions::CODE_SIZE;
+}
+
+// Do message classes in this file have descriptor and refelction methods?
+inline bool HasDescriptorMethods(const FileDescriptor *file) {
+  return file->options().optimize_for() != FileOptions::LITE_RUNTIME;
+}
+
 }  // namespace objectivec
 }  // namespace compiler
 }  // namespace protobuf