Re: a question about directory structure of libjava

On Thu, Jan 20, 2011 at 12:42 PM, majia gm <[email protected]> wrote:

> Hi, Bryce.
>
> Thanks for your reply. It's very kind of you.
>
> I'v read a little document of JNI and CNI.
>
> CNI seems to layout data such as classes and objects conforming to
> C++, so there comes the header file.
>
>  What I'm really curious about is how the non-native methods in
> library being executed in runtime. One way I can imagine is to
> interpret the byte codes.
>
> But when I use GDB to track gij,  I found native codes,  source lines
> of which is in Java files of the library.
>
> Dose it mean the byte codes in library may be translated into native codes?
>  If it is the truth, then when dose it happen?

gcj is a java-to-native-code compiler. So, the Java code in libjava is
compiled, by gcj, into a native code library, libgcj.so. libgcj.so
contains both the Java and C/C++ parts of the library. This all
happens at the time you build GCC, rather than at runtime like a
traditional JVM.

Bryce