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Editorial Team
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Asked: 2026-05-16T02:43:34+00:00

I have two functions declared as following, using extern C aming to avoid name

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I have two functions declared as following, using extern "C" aming to avoid name mangling. 

#ifdef __cplusplus
extern "C" {
#endif
JNIEXPORT jobject JNICALL Java_com_trident_tv_si_SIManagerImpl_nGetServiceDetails
  (JNIEnv *, jobject, jint);

JNIEXPORT jobject JNICALL Java_com_trident_tv_si_SIManagerImpl_nGetServiceCurrentEvent
  (JNIEnv *, jobject, jint);
#ifdef __cplusplus
}
#endif
#endif

Surprisingly, the second function still have a mangled name _GLOBAL__I_Java_com_trident_tv_si_SIManagerImpl_nGetServiceCurrentEvent , I was wondering what is the purpose of it and why the first function did not generate one? 

00004d58 T Java_com_trident_tv_si_SIManagerImpl_nGetServiceCurrentEvent
0000533a T Java_com_trident_tv_si_SIManagerImpl_nGetServiceDetails
0000494f t _GLOBAL__I_Java_com_trident_tv_si_SIManagerImpl_nGetServiceCurrentEvent

EDIT:

Find something here. However, no clear answer yet.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12293

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1 Answer

  1. Editorial Team

    It looks to me like the two functions have the correct names ( the two preceded by T ), and that a third symbol (preceded by t) is created for gccs internal use.

    They have been reordered though.

    // SECOND FUNCTION, T = exported and in TEXT section
00004d58 T Java_com_trident_tv_si_SIManagerImpl_nGetServiceCurrentEvent
// FIRST FUNCTION, T = exported and in TEXT section
0000533a T Java_com_trident_tv_si_SIManagerImpl_nGetServiceDetails
// INTERNAL symbol, t = non-exported symbol in TEXT section
0000494f t _GLOBAL__I_Java_com_trident_tv_si_SIManagerImpl_nGetS
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