URGENT! debugger for debugging java mixed with c Program

Question

hi,
i am assigned to do a project to develop a tool which can debug java program
in which calls to native functions are made .Can anyone give some valuable
suggestions how to proceed.bye

Answer 1

thanks for the reply.i went through the suggested
site but i could'nt
obtain any implementation issues of such a
debugger.can u suggest a way
to implement such a debugger.Well, you have the source for jdb, which is in
$JAVA_HOME/demo/jpda/examples.jar. This
is an example of how you control the Java Language
portions of the debugee (breakpoints, stepping,
viewing program state, etc...). In order to do
this, jdb accesses the Java Virtual Machine to look
up threads, stack frames, local variables, Objects
in the heap, and so on). jdb does this using the
Java Debug Interface (JDI), which is described
here:
http://java.sun.com/j2se/1.4.1/docs/guide/jpda/architecture.html
http://java.sun.com/j2se/1.4.1/docs/guide/jpda/jdi/index.html
To add native debugging to this mix, you will need to
provide similar capabilities when executing native code.
One example would be setting a breakpoint in a native
method in the debugee. Later on, what do you do when that
breakpoint is hit? How do you represent the native stack,
threads, and other program state? How do you map from a
machine instruction to the corresponding program source?
You will also need to keep the two views (Java and native)
synchronized as execution moves along.
I suggest you take a look at the source for a native
debugger to get a feel for what is involved, and then
think about adding mixed language support to it. One
example would be the Gnu debugger (gdb), which is available
here (and on many other mirror sites):
ftp://ftp.gnu.org/gnu/gdb/index.html