How to debug hotspot integrated with java codes
Xiaobin Lu
Xiaobin.Lu at Sun.COM
Mon Dec 15 14:52:47 PST 2008
I am attaching the realpath program and as its name suggests, it resolve
the file path and gives it the real full path.
-Xiaobin
On 12/15/08 14:23, Colin(Du Li) wrote:
> Hi, Xiaobin,
>
> The "gamma" application works well without dbx attached to it.
>
> I tried the script. It give error message "Can't find realpath.
> Exiting...".
> I guess I need modified the "realpath" in the script. Right?
> However, what does "realpath" mean?
> Thanks a lot.
>
>
> xiaobin.lu wrote:
>
>> Hi Colin,
>>
>> It looks like the process hang when it tried to load some classes. Did
>> the application work without dbx attached to it?
>>
>> Along the link I sent to you, there is a link
>> (http://developers.sun.com/solaris/articles/Java_debug/Java_debug_content.html)
>> which tells you how to debug Java process, please take a look at it. We
>> have a script to launch dbx internally and it takes care of the
>> LD_LIBRARY_PATH problem as well. I am attaching it in the email. You can
>> start that script as the following:
>>
>> dbxr <path to java executable> -server (or -client which loads the
>> server or client VM)
>>
>> -Xiaobin
>>
>> On 12/15/08 10:57, Colin(Du Li) wrote:
>>
>>> Hi, Xiaobin,
>>>
>>> I tried dbx, but dbx will hang after echo "reading libzip.so" as below:
>>>
>>>
>>>> $ dbx $LD_LIBRARY_PATH/gamma
>>>>
>>>>
>>> For information about new features see `help changes'
>>> To remove this message, put `dbxenv suppress_startup_message 7.6' in your
>>> .dbxrc
>>> Reading gamma
>>> Reading ld-linux.so.2
>>> Reading libjvm.so
>>> Reading libm.so.6
>>> Reading libdl.so.2
>>> Reading libpthread.so.0
>>> Reading libc.so.6
>>> (dbx) run -version
>>> Running: gamma -version
>>> (process id 5777)
>>> Reading librt.so.1
>>> Reading libhpi.so
>>> Reading libnsl.so.1
>>> Reading libnss_files.so.2
>>> Reading libverify.so
>>> Reading libjava.so
>>> Reading libzip.so
>>> ....
>>>
>>> Then I have to kill this process to stop it.
>>> Do you know how to resolve this problem and start dbx properly？
>>> Thanks.
>>>
>>>
>>> xiaobin.lu wrote:
>>>
>>>
>>>> Refer to
>>>> http://developers.sun.com/sunstudio/overview/topics/debug_index.html to
>>>> find more details on how to use Sun Studio which is available on Linux
>>>> to debug mixed Java and native code.
>>>>
>>>> -Xiaobin
>>>>
>>>> Colin(Du Li) wrote:
>>>>
>>>>
>>>>> Hi, guys.
>>>>>
>>>>> Now I'm debugging Hotspot. I'm using GDB. When I debug the source codes
>>>>> written in c++, it's fine. But if the VM has launched, I cannot trace
>>>>> into
>>>>> the source codes written in java. e.g. When I find Hotspot cannot load
>>>>> some
>>>>> class, and I wanna step into the class java.lang.ClassLoader , I don't
>>>>> know
>>>>> how to trace it. Apparently, I cannot do that with GDB.
>>>>> Can you guys give me some suggestion for debug in this situation?
>>>>> I spend several days on this problem, and really need some help on the
>>>>> debug things.
>>>>>
>>>>> Thanks a lot in advance!!
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>> #!/bin/sh
>> clean_temp_files() {
>> rm -f /tmp/dbxr.$$ /tmp/cmd.$$
>> }
>>
>> arch=
>> if [ -f /proc/cpuinfo ] ; then
>> arch=`uname -m`
>> if [ "$arch" = i686 ]; then
>> arch=i386
>> realpath=/net/smite.sfbay/export/linux-i586/bin/realpath
>> fi
>> else
>> arch=`uname -p`
>> if [ "$arch" = sparc ] ; then
>> realpath=/home/xl116366/bin/realpath
>> PATH=/shared/dp/venus/sparc-S2/bin:$PATH
>> elif [ "$arch" = i386 ] ; then
>> realpath=/net/smite.sfbay/export/i386/realpath
>> PATH=/shared/dp/venus/intel-S2/bin:$PATH
>> fi
>> fi
>> if [ -z "$arch" ]; then
>> echo "Unknown architecture. Exiting..."
>> exit 1
>> fi
>>
>> if [ ! -x $realpath ]; then
>> echo "Can't find realpath. Exiting..."
>> exit 1
>> fi
>>
>> exe=$1
>> if [ ! -x "$1" ]; then
>> exe=`which $1`
>> dir=`$realpath $exe`
>> else
>> dir=`$realpath $exe`
>> fi
>> dir=`dirname $dir`
>> dir=`dirname $dir`
>> if [ `basename $dir` = "bin" ]; then
>> dir=`dirname $dir`
>> fi
>> dir=`$realpath $dir`
>>
>> trap clean_temp_files 2
>>
>> usage() {
>> echo "Usage: dbxr [ -dbx | -gdb ] [ -window ] [ -core ] [ -corefile
>> <file> ] command ..."
>> exit
>> }
>>
>> if [ `uname` = "SunOS" ]; then
>> debugger=dbx
>> else
>> debugger=gdb
>> fi
>>
>> debugargs=
>> debugprecmd=
>> while [ $# -gt 0 ]; do
>> if [ $1 = -core ] ; then
>> debugargs=core
>> shift
>> elif [ $1 = -corefile ] ; then
>> debugargs="$2"
>> shift 2
>> elif [ $1 = -help ] ; then
>> usage
>> elif [ $1 = -dbx ] ; then
>> debugger=dbx
>> shift
>> elif [ $1 = -gdb ] ; then
>> debugger=gdb
>> shift
>> elif [ $1 = -window ] ; then
>> if [ -x /usr/dt/bin/dtterm ]; then
>> debugprecmd="/usr/dt/bin/dtterm -e"
>> else
>> debugprecmd="xterm -e"
>> fi
>> shift
>> elif [ $1 = -echo ] ; then
>> debugprecmd="echo"
>> shift
>> else
>> break;
>> fi
>> done
>>
>> jvmcfg=$dir/lib/$arch/jvm.cfg
>> extra=:$dir/../lib/$arch
>> if [ -d $dir/jre ]; then
>> dir=$dir/jre
>> extra=:$dir/../lib/$arch
>> jvmcfg=$dir/lib/$arch/jvm.cfg
>> fi
>> if [ "$2" = -client ]; then
>>
>> LD_LIBRARY_PATH=$dir/lib/$arch/client:$dir/lib/$arch$extra:$LD_LIBRARY_PATH
>> elif [ "$2" = -server ]; then
>>
>> LD_LIBRARY_PATH=$dir/lib/$arch/server:$dir/lib/$arch$extra:$LD_LIBRARY_PATH
>> elif [ "$2" = -d64 ]; then
>> if [ "$extra" != "" ]; then
>> extra=$extra"v9"
>> fi
>>
>> if [ "$arch" = i386 ]; then
>>
>> LD_LIBRARY_PATH=$dir/lib/amd64/server:$dir/lib/amd64:$dir/../lib/amd64:$LD_LIBRARY_PATH
>> #echo $LD_LIBRARY_PATH
>> else
>>
>> LD_LIBRARY_PATH=$dir/lib/sparcv9/server:$dir/lib/sparcv9$extra:$LD_LIBRARY_PATH
>> fi
>> else
>> default=`awk '/^-/ { print substr($1, 2); exit(0); }' $jvmcfg`
>>
>> LD_LIBRARY_PATH=$dir/lib/$arch/$default:$dir/lib/$arch$extra:$LD_LIBRARY_PATH
>> fi
>> export LD_LIBRARY_PATH PATH
>> javacmd=$*
>>
>> shift
>> if [ $debugger = "gdb" ] ; then
>> echo "handle SIGSEGV noprint nostop pass" >> /tmp/cmd.$$
>> echo "handle SIGUSR2 noprint nostop pass" >> /tmp/cmd.$$
>> echo "handle SIGILL noprint nostop pass" >> /tmp/cmd.$$
>> echo "handle SIGABRT print stop nopass" >> /tmp/cmd.$$
>> echo "shell rm /tmp/cmd.$$" >> /tmp/cmd.$$
>> echo "set args $*" >> /tmp/cmd.$$
>> exec $debugprecmd $debugger --command=/tmp/cmd.$$ $exe
>> else
>> rm -f /tmp/cmd.$$
>> echo $debugargs
>> if [ "$debugargs" != "" ]; then
>> echo "debug $exe $debugargs" > /tmp/cmd.$$
>> else
>> echo "debug $exe" >> /tmp/cmd.$$
>> echo "runargs $*" >> /tmp/cmd.$$
>> fi
>> echo "if [ -f ~/.dbxr.rc ]; then source ~/.dbxr.rc; fi" >> /tmp/cmd.$$
>> echo "rm /tmp/cmd.$$" >> /tmp/cmd.$$
>> exec $debugprecmd $debugger -c "source /tmp/cmd.$$"
>> fi
>> clean_temp_files
>>
>>
>>
>
>
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