[Jikesrvm-core] [ jikesrvm-Patches-1513627 ] Initial JDWP support

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Patches item #1513627, was opened at 2006-06-27 22:27
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Ian Rogers (captain5050)
Assigned to: Nobody/Anonymous (nobody)
Summary: Initial JDWP support

Initial Comment:
This patch implements some support for Classpath's JDWP
implementation. There is enough support to establish
the debugger connection in Eclipse. By handling more
events fuller debugger support can be added (for
example we need new callbacks for thread start and end).

The patch consists of a new libSupport directory (tar
ball) and patches to the VM start up so that it
processes the JDWP startup arguments. The command line
argument looks like:
-X:runjdwp:transport=dt_socket,address=localhost:1234,server=y,suspend=n
where this specifies the connection method (socket on
localhost port 1234), whether the VM (as opposed to the
debugger) is to be the server, and whether the main
thread should be suspended on startup.

JDWP can be debugged by a TCP/IP spy program that's
part of Eclipse. In Eclipse 3.2.0RC7 this is started as
follows:
java -cp
plugins/org.eclipse.jdt.debug_3.2.0.v20060601/jdimodel.jar:plugins/org.eclipse.osgi_3.2.0.v20060601.jar:plugins/com.ibm.icu_3.4.4.1.jar
org/eclipse/jdi/internal/spy/TcpipSpy 6900 localhost 1234
Eclipse or netbeans can debug directly or through the
spy program, here they should connect to port 6900.

Due to problems with the current Jikes RVM socket code,
this patch currently disables it when JDWP is
specified. This leads to the VM timing out if left idle
for too long.

The code initialises the JDWP support using the
mechanism present in the current Classpath CVS head,
the method used in Classpath 0.91 is different, so it
is expected this code won't work for Classpath 0.91.

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