Using libjvm.diz in gdb

[Daniel D. Daugherty]

Doug,

In addition to what Dmitry says about libjvm.so being loaded...

If the libjvm.diz files are unzipped adjacent to their corresponding
libjvm.so files, then no "symbol-file" command should be necessary.

Also, what is the "graal" VM flavor? I'm used to "client" and "server"
so I don't know if there is proper FDS support for a different VM flavor.

Dan



On 8/20/12 2:15 PM, Douglas Simon wrote:
> I've just encountered the new Full Debug Symbols support in HotSpot and am having trouble using it with gdb. When I start gdb on a debug build (i.e. jvmg) of HotSpot, I also load the unzipped libjvm.diz file as follows:
>
> ~/linz/graalvm$ gdb jdk1.7.0_06/debug/bin/java
> (gdb) symbol-file /mnt/ubuntu-10.04/home/dsimon/linz/graalvm/jdk1.7.0_06/debug/jre/lib/amd64/graal/libjvm.debuginfo
> Reading symbols from /mnt/ubuntu-10.04/home/dsimon/linz/graalvm/jdk1.7.0_06/debug/jre/lib/amd64/graal/libjvm.debuginfo...done.
> (gdb) b methodDataOop.cpp:870
> Cannot access memory at address 0x573d06
>
> Naturally, the program never stops at the line where I'm trying to set the breakpoint.
>
> What am I doing wrong? Is there some information on how one is supposed to use FDS for debugging under gdb (or dbx)?
>
> -Doug