On Thu, Jan 20, 2011 at 12:42 PM, majia gm <gmmajia@xxxxxxxxx> 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
