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Performance in scoping [message #1037229]

Tue, 09 April 2013 06:02

Eclipse User

We are developing a DSL with the complexity comparable to java or c++. Then the performance is largely impaired, typically in scoping...

One of the features we need to support is like finding all elements in super types which again would have other supertypes..., which is realized in scoping, but when the DSL code size increases, it's extremely slow

Xtext resources always need reloading in different usage, editting, build..., exactly the same process will repeat.

Is there any way to make things faster??

Re: Performance in scoping [message #1037543 is a reply to message #1037229]

Tue, 09 April 2013 13:34

Eclipse User

Hi,

a starting point may be to store in information you need in the xtext index
(customizing IDefaultResourceDescriptionStrategy -> you can add user data there)
and then in the scope provider instead of travering the model
wrapping delegateGetScope into a FilteringScope)

since the index is inmemory this may be much faster than traversing the model which leads actually to everything being parsed.

Re: Performance in scoping [message #1037743 is a reply to message #1037543]

Tue, 09 April 2013 20:43

Eclipse User

Hi,
Thanks a lot Smile

It seems very promising !

Re: Performance in scoping [message #1037760 is a reply to message #1037743]

Tue, 09 April 2013 21:20

Eclipse User

Hey Paul - one gotcha with that... if you're dependent on the userData in your IEObjectDescriptions for objects defined within the current editor, you need to add that data in your MyDSLImportedNamespaceAwareLocalScopeProvider as well.

Local IEObjectDescriptions are built by the ImportedNamespaceAwareLocalScopeProvider. Imported files are built by the ResourceDescriptionStrategy. Add the appropriate userData in both and everything should look the same no matter where it comes from.

Binding a custom LocalScopeProvider was a little tricky for me. In the RuntimeModule, add:

    @Override
    	public void configureIScopeProviderDelegate(Binder binder) {
    	binder.bind(org.eclipse.xtext.scoping.IScopeProvider.class)
    	.annotatedWith(
    			com.google.inject.name.Names.named(org.eclipse.xtext.scoping.impl.AbstractDeclarativeScopeProvider.NAMED_DELEGATE)).to(MyDSLImportedNamespaceAwareLocalScopeProvider.class);	
    	}

Re: Performance in scoping [message #1037778 is a reply to message #1037760]

Tue, 09 April 2013 21:58

Eclipse User

Thank you Steve,
for the advice Smile

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