[Bug java/18278] JNI functions cannot return a weak reference

["tromey at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From tromey at gcc dot gnu dot org  2004-12-01 21:40 -------
How curious.  Apparently the JDK unwraps the return result of
a JNI method that returns a JNI weak reference.

I think it is too late to implement this for GCC 4.0 (unless the
commit rules change again).  Here is how it could be fixed:

* Write a new _Jv_UnwrapJNIWeakReference function in jni.cc that is
  extern "C".  (This can be copied from the existing 'unwrap'
  template function.)
* Make a built-in declaration for this in gcj
* Change expr.c:build_jni_stub to call this function when the return
  type is not a primitive type.  (there is already a comment explaining
  where some unwrapping could be done)
* Also modify jni.cc:_Jv_JNIMethod::call() to do this transformation


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18278