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From "Ivan Popov" <ivan.g.po...@gmail.com>
Subject Re: Harmony+Eclipse and Scrapbook Pages
Date Mon, 23 Apr 2007 17:31:23 GMT
I submitted http://issues.apache.org/jira/browse/HARMONY-3730


On 4/23/07, Ivan Popov <ivan.g.popov@gmail.com> wrote:
> I've looked deeply at what happened in stepping over Scrapbook code,
> and it seems that the problem is not in class loading due to JIT
> algorithm, but because some JVMTI step events are not reported in JIT
> mode.
> Scrapbook code attempts to load class in an infinite loop using URL
> classloader. This classloader issues NoClassDefFoundError internally
> while attempting to load class from several URLs, but it is never
> exposed to the user code.
> The problem arises when this code is executed under debugger. After
> application is stopped at breakpoint and debugger performs STEP OUT,
> requested JVMTI step events are not reported until application goes to
> a point where NoClassDefFoundError is thrown inside URLClassLoader
> code and only here STEP event is generated and reported to Eclipse
> debugger. It looks like Eclipse ignores such STEP event in unexpected
> code and Scrapbook functionality fails.
> In -Xint mode JVMTI STEP events are not skipped and Harmony reports
> STEP event at expected place and this works well with Eclipse.
> I'm going to file JIRA and provide simple test case to reproduce this problem.
> Thanks.
> Ivan
> On 4/23/07, Tim Ellison <t.p.ellison@gmail.com> wrote:
> > Mikhail Fursov wrote:
> > > It proves that we have a bug here that can be fixed without lazy
> > > resolution fixes. The only problem is to minimize the testcase.
> >
> > Let me know if I can be of any further help -- but it sounds like we
> > need someone who understands the JITed stack walker, or other likely
> > candidates for this bug.
> >
> > Running the snippet code in a simple test case passes ok for me, but it
> > may not have been jitted.  What is the command-line option to force full
> > optimized jitting eagerly?
> >
> > Regards,
> > Tim
> >

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