Not able to call CppGenerator::Generate() twice

[JZ]

Hello,

I am currently using Google's ProtocolBuffers inside my C++ app.

One feature I am adding will generate X.pb.cc and  X.pb.h after I've chosen a proto file from a file dialog.

To do that, I am calling CppGenerator::Generate (I made my own implementation of ZeroCopyOutputStream and GeneratorContext). I also target-linked with pthread (otherwise, the Generate() call will send a SIG ABRT error).

The first time I do that, the .pb.cc and .pb.h files are generated sucessfully. However, when I try to use this feature a second time, I get a SIG ABRT error (it should be a multi-thread problem).

The valgrind output shows :

Process terminating with default action of signal 11 (SIGSEGV)

Access not within mapped region at address 0x38F0000057E

google::protobuf::EnumDescriptor::FindValueByNumber(int) const

google::protobuf::internal::NameofEnum

google::protobuf::compiler::cpp::(anonymous namespace)::SetPrimitiveVariables

google::protobuf::compiler::cpp::PrimitiveFieldGenerator::PrimitiveFieldGenerator

google::protobuf::compiler::cpp::FieldGeneratorMap::MakeGenerator

google::protobuf::compiler::cpp::FieldGeneratorMap::FieldGeneratorMap

google::protobuf::compiler::cpp::MessageGenerator::MessageGenerator

google::protobuf::compiler::cpp::FileGenerator::FileGenerator

google::protobuf::compiler::cpp::CppGenerator::Generate

ProtobufGenerator::GenCode

Is there a way to "reset" the threading system of the program once I have finished the first call of Generate() ?

I have already tried to delete the instance of the CppGenerator and reinstantiate a new one to call Generate() a second time, but it doesn't work.

However, if I call Generate() twice consecutively within one same call of the "GenCode" method, it works.

I can't do that :

ProtobufGenerator::GenCode => google::protobuf::compiler::cpp::CppGenerator::Generate

and then, another time

ProtobufGenerator::GenCode => google::protobuf::compiler::cpp::CppGenerator::Generate

But I can do :

ProtobufGenerator::GenCode =>

google::protobuf::compiler::cpp::CppGenerator::Generate

google::protobuf::compiler::cpp::CppGenerator::Generate

Any idea please?

Thank you very much for your help

[Adam Cozzette]

As far as I know, it should be fine to call CppGenerator::Generate() multiple times. The compiler code is all single-threaded so I doubt that the problem is thread-related. How are you creating the FileDescriptor that you pass to the Generate() call? If I had to guess I would say that something is wrong with the descriptors on the second call--maybe they are being destroyed after the first call and the second call is trying to use a dangling pointer.

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