Hi Oliver: We did consider implementing this tool based on JDI, we have a misunderstanding on between C/C++'s efficiency and Java's usability for this project. We considered the implementation too extremely, there is a long chain from JVMTI to JDB: JVMTI - JDWP - JDI - JDB. JDI encapsulate JDWP and we don't need to care about the protocol detail: command, package, data type and so on. Maybe we should use the software architecture's principle: add a midware to our implements to decouple the dependence and more transparent to users even it may cause a few of efficient problems.
2009/4/1 Oliver Deakin <[email protected]>: > Hi, and welcome to Harmony! > > hu jing wrote: >> >> Hi all, >> >> I am interested in the "jdb command line debugger tool". I find Sun jdb >> > > Great! >> >> is not very friendly to developers. I want to add some useful function to >> this tool. Such as, Auto-complete command line, smart format for the user >> input. And we can also supply some interfaces to further development. >> Wen Dong([email protected]) and I want to participate in this tool >> development. We are from the same laboratory of the Department of Computer >> Science of Nanjing University. We worked together for two years and now we >> are both interns in IBM CDL. I think we can work out the debugger tool >> pretty. >> > > I don't know what the rules are for co-working on a project - I believe each > project has to be an individual effort. You could ask on the GSoC discussion > mailing list (mailing lists and other useful info can be found here [1]). > >> The popular architecture is JPDA(Java Platform Debugger Architecture). >> JPDA contains three parts: JVMTI, JDWP and JDI. JVMTI(Java Virtual Machine >> Tool Interface) supply a set of native interface supplied by JVM. The >> development based on the JVMTI level is complex and hard to be extended >> and >> modified. JDWP supplies a standard protocol for the communication between >> the debugger and debuggee. And it also provides the socket interface. JDI >> is >> debug interface. It is mostly implemented in Java. JVMTI and JDWP are >> based >> native code. We want to implement the java command line debugger tool in >> C/C++ considering efficiency. We will use JDWP interface for development >> efficiency and Portability. >> > > Have you considered coding the tool in Java and using JDI to access all the > required functions? I think it will be more portable, easier to maintain, > and will fit more naturally with the other command line tools we have in > Harmony. > >> The following is our main idea for this tool: >> >> 1.format the user input. >> 2.validate the command arguments. >> 3.Create connection between debugger and JVM, and here we can use the >> JDWP Transport Interface. Based on the JDWP, We create packages containing >> the command information and send packages to JVM by using the transport >> interface. JVM will process these packages and send the feedback to the >> debugger. And we will process this information. >> 4.print the message on the console. >> >> >> Schedule: >> We can work 20 hours each week. >> April 4 ~ April 30: Be family with JDWP and JDWP Transport >> Interface. >> May 1 ~ May 22: meet our mentors, read the documentation and get >> some >> suggestions from our mentors. >> May 23 ~ May 30: to determine the final framework and algorithm >> details, divide the work with my partners. >> June 1 ~ June 30: coding. >> July 1 ~ July 5: integration, test and debug for mid-term >> evaluations. >> July 6 ~ August 11: process the debug, documentation and >> integration. >> August 12 ~ August 24: write test unit, debug and final release. >> > > Looks like a good plan. You need to clear up the issue of working with a > partner - if that is a possibility, or you can decide on one of you to work > on the project alone, then please draft a submission in the GSoC tool [2] as > soon as possible. The deadline for submissions is Friday 3rd April. > > Regards, > Oliver > > [1] http://socghop.appspot.com/document/show/program/google/gsoc2009/faqs > [2] http://socghop.appspot.com/ > >> >> Jing Hu , WenDong Zhang. >> >> > > -- > Oliver Deakin > Unless stated otherwise above: > IBM United Kingdom Limited - Registered in England and Wales with number > 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire > PO6 3AU > > -- Best Regards! Wen Dong
