Chris,
New spec for stop command is:
"Usage: stop [go|thread] [threadid
<thread_id>] <at|in> <location>\n"
...
253 " If \"thread\" is specified, only suspend the thread we
stop in\n" +
...
255 " If [threadid <thread_id>] is specified, only stop
in the specified thread" +
I wonder if it can be changed to something like this:
"Usage: stop
[go|thread [<thread_id>]]
<at|in> <location>\n"
That's not correct since it requires that you specify "go" or
"thread" if you want to specify the thread to stop in. Right now if
you do:
stop threadid 5 Main:3
It will only stop in threadid 5, but all threads will be suspended.
Your syntax does not support this. I could attempt to go with:
"Usage: stop
[go|thread] [<thread_id>]
<at|in> <location>\n"
Basically the same as before, but not require the use of
"threadid". I don't think it would be too hard. After dealing with
"go" or "thread", if the next token is not "at" or "in", then
require that it be a threadid integer.
Chris
...
253 " If \"thread\" is specified, only suspend the thread
we stop in\n" +
...
255 " If [<thread_id>] is specified, only stop in the
specified thread" +
What do you think?
Thanks,
Serguei
On 2/21/19 16:46, serguei.spit...@oracle.com wrote:
On 2/21/19 09:19, Chris Plummer
wrote:
The first is the help output when there is an error parsing
the "stop" command. The second is the help output when you
type "help", which includes help for all commands.
My question is that a couple of statements are missed in the printstopcommandusage.
The help output prints these two lines which are not present in
the printstopcommandusage:
378 " -- set a breakpoint\n" +
379 " -- if no options are given, the current list of breakpoints is printed\n" +
Is it intentional?
250 {"printstopcommandusage",
251 "Usage: stop [go|thread] [threadid <thread_id>] <at|in> <location>\n" +
252 " If \"go\" is specified, immediately resume after stopping\n" +
253 " If \"thread\" is specified, only suspend the thread we stop in\n" +
254 " If neither \"go\" nor \"thread\" are specified, suspend all threads\n" +
255 " If [threadid <thread_id>] is specified, only stop in the specified thread" +
256 " \"at\" and \"in\" have the same meaning\n" +
257 " <location> can either be a line number or a method:\n" +
258 " <class_id>:<line_number>\n" +
259 " <class_id>.<method>[(argument_type,...)]"
260 },
377 "stop [go|thread] [threadid <thread_id>] <at|in> <location>\n" +
378 " -- set a breakpoint\n" +
379 " -- if no options are given, the current list of breakpoints is printed\n" +
380 " -- if \"go\" is specified, immediately resume after stopping\n" +
381 " -- if \"thread\" is specified, only suspend the thread we stop in\n" +
382 " -- if neither \"go\" nor \"thread\" are specified, suspend all threads\n" +
383 " -- if [threadid <thread_id>] is specified, only stop in the specified thread\n" +
384 " -- \"at\" and \"in\" have the same meaning\n" +
385 " -- <location> can either be a line number or a method:\n" +
386 " -- <class_id>:<line_number>\n" +
387 " -- <class_id>.<method>[(argument_type,...)]\n" +
http://cr.openjdk.java.net/~cjplummer/8219143/webrev.01/src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/Commands.java.frames.html
1162 * Allowed syntax:
1163 * stop [go|thread] <at|in> [threadid <thread_id>] <location>
1164 * <location> can either be a line number or a method:
1165 * - <class id>:<line>
1166 * - <class id>.<method>[(argument_type,...)]
1167 * If "go" is specified, then immediately resume after stopping. No threads are suspended.
1168 * If "thread" is specified, then only suspend the thread we stop in.
1169 * If neither "go" nor "thread" are specified, then suspend all threads.
1170 * If the optional [threadid <thread_id>] is specified, then only stop in the specified thread.
1171 * If no options are given, the current list of breakpoints is printed,
1172 */
The above is not aligned with the implementation as <at|in> has to be right before <location>.
A dot is needed instead of the last comma.
Should this comment to match one of the above descriptions?
Yes, I'll update this to look like the help output. I missed
it when moving the at/in location.
Okay, thanks!
I'll send full review soon.
Thanks,
Serguei
thanks,
Chris
Thanks,
Serguei
On 2/20/19 19:56, Chris Plummer wrote:
Please
review the updated webrev:
http://cr.openjdk.java.net/~cjplummer/8219143/webrev.01/
The syntax is now:
stop [go|thread] [threadid <thread_id>]
<at|in> <location>
I filed JDK-8219507 to cover BreakpointSpec.toString()
improvements, and other possible improvements to the
output when listing breakpoints.
I did a minor fix in TTYResources.java to address a bug
from a recent JDK-8218941 commit that added the dbgtrace
command. There was missing newline. I've added a note to
JDK-8218941 indicating that it is being fixed here.
I've added a test. Below is a log of the debug session
output that might help with reading the source of the
test. The test creates 3 threads that all execute the same
code, and verifies that the breakpoint set using the
threadid option only stops on the one specified thread.
thanks,
Chris
[jdb] Set uncaught java.lang.Throwable
[jdb] Set deferred uncaught java.lang.Throwable
[jdb] Initializing jdb ...
[jdb]
[jdb] VM Started: > No frames on the current call stack
[jdb]
[jdb] main[1]
> stop in JdbStopThreadidTestTarg.brkMethod
[jdb] Deferring breakpoint
JdbStopThreadidTestTarg.brkMethod.
[jdb] It will be set after the class is loaded.
[jdb] main[1]
> run
[jdb] > Set deferred breakpoint
JdbStopThreadidTestTarg.brkMethod
[jdb]
[jdb] Breakpoint hit: "thread=main",
JdbStopThreadidTestTarg.brkMethod(), line=80 bci=0
[jdb] 80 }
[jdb]
[jdb] main[1]
> threads
[jdb] Group system:
[jdb] (java.lang.ref.Reference$ReferenceHandler)367
Reference Handler running
[jdb] (java.lang.ref.Finalizer$FinalizerThread)368
Finalizer cond. waiting
[jdb] (java.lang.Thread)369
Signal Dispatcher running
[jdb] Group main:
[jdb] (java.lang.Thread)1 main running (at
breakpoint)
[jdb] (JdbStopThreadidTestTarg$MyThread)482
MYTHREAD-1 waiting in a monitor
[jdb] (JdbStopThreadidTestTarg$MyThread)483
MYTHREAD-2 waiting in a monitor
[jdb] (JdbStopThreadidTestTarg$MyThread)484
MYTHREAD-3 waiting in a monitor
[jdb] Group InnocuousThreadGroup:
[jdb] (jdk.internal.misc.InnocuousThread)416
Common-Cleaner cond. waiting
[jdb] main[1]
> stop threadid 483 in
JdbStopThreadidTestTarg$MyThread.brkMethod
[jdb] Set breakpoint
JdbStopThreadidTestTarg$MyThread.brkMethod
[jdb] main[1]
> cont
[jdb] >
[jdb] Breakpoint hit: "thread=MYTHREAD-2",
JdbStopThreadidTestTarg$MyThread.brkMethod(), line=101
bci=0
[jdb] 101 }
[jdb]
[jdb] MYTHREAD-2[1]
> cont
[jdb] >
[jdb] The application exited
[jdb]
On 2/20/19 2:23 PM, Chris Plummer wrote:
On 2/20/19 2:00 PM, Alex Menkov
wrote:
Hi Chris,
- New threadid param breaks at/in clause - this
doesn't look good.
Maybe it would be better to put threadid before in/at:
stop [go|thread] [threadid <thread_id>]
<at|in> <location>
Ok. I'll try moving it.
This also would make
commandStop/parseBreakpointSpec logic more clear:
commandStop handles go/thread/threadid,
parseBreakpointSpec handles position (part starting
from in/at);
- do you think BreakpointSpec toString should contain
info about the thread (i.e. to specified in the
breakpoint list)?;
I had added this at one point, alone with also adding
the suspend policy. You then see both of these when you
use "stop in/at" or "clear" without any arguments (it
lists the breakpoints in this case). I was a little
worried that the extra text might break something, so I
left it out. Note also that currently the text given
when you list breakpoints is exactly the text you need
to enter when using the clear command, so that would no
longer be true if I added any more text. However, I did
envision a better version of this that not only include
the suspend policy and threadid, but also a breakpoint
index, allowing you to more easily clear one after
listing it. Maybe I could add an RFE for this.
- it would be nice to add a test for the new threadid
functionality.
I've been working on one today. It's near completion.
Chris
--alex
On 02/19/2019 21:57, Chris Plummer wrote:
Hello,
Please review the following:
http://cr.openjdk.java.net/~cjplummer/8219143/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8219143
Normally when a breakpoint is set in jdb, it is set
globally (all threads). JDI supports the ability to
have the breakpoint be automatically filtered so it
will only be delivered on a specified thread and
ignored on all other threads. This change allows
making use of that JDI feature from jdb. So instead
of something like:
stop at Foo:23
You can now do:
stop at threadid 7 Foo:23
Where 7 is the threadID for the thread as seen in
the output of the "threads" command. The format of
the stop command is now:
stop [go|thread] <at|in> [threadid
<thread_id>] <location>
It is still fully backwards compatible.
As part of this change I also cleaned up the "stop"
command parsing and error handling. It was kind of a
mess, and was near impossible to add the "threadid"
option until after I did much of the cleanup. I've
also cleaned up the help output a lot, and added
help for the "go" and "thread" options. One last
change was to remove the distinction between "stop
at" and "stop in", which was suggested already in a
comment. They can be used interchangeably now. The
changes in Commands.java are pretty much all just
the above cleanup, except for the one short section
with the 'Handle "threadid" modifier' comment.
thanks,
Chris
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