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dead loop in parser triggered by content assist [message #1764759]

Fri, 02 June 2017 07:04

paul lu

Messages: 43
Registered: April 2013

Member

Hi,

I encountered a dead loop when triggering content assist (Ctrl + Space) at some position in our own DSL code.
ContentAssistContextFactory.handleLastCompleteNodeIsAtEndOfDatatypeNode would call parser.getFollowElements(AbstractInternalContentAssistParser). The parser is generated under the *ide project.

This is a DSL with XBase, this seems to run forever, after I suspend the thread, I see the traces below repeating:

..
internal*Parser.rule_XOtherOperator..
...
internal*Parser.rule_XOr...
internal*Parser.rule_XAnd...
..
internal*Parser.rule_XAnd...

The parser is generated and it's hard to go through it. Do you have any clue about this? Or how can I proceed with the problem?

Thanks

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Re: dead loop in parser triggered by content assist [message #1764762 is a reply to message #1764759]

Fri, 02 June 2017 07:11

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

can you create a bug at https://github.com/eclipse/xtext-extras
with a minimal reproducing grammar and test model

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Re: dead loop in parser triggered by content assist [message #1764902 is a reply to message #1764762]

Sat, 03 June 2017 08:01

paul lu

Messages: 43
Registered: April 2013

Member

Hi Christian,

I created a bug for this, https://github.com/eclipse/xtext-extras/issues/148

I used a small example to reproduce (press Ctrl+Space at the end of the xbase file).

Test.xtend:

class Test{
def test(Object p1, Object p2){
}
def whenOK((Object)=>void p) {
}
}
test.xbase:

t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[
t.test(t, t.whenOK[

])
])
])
])
])
])
])
])
])

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