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Eclipse Refactoring [message #644556]

Mon, 13 December 2010 09:35

Dharam

Messages: 18
Registered: December 2010

Junior Member

Hello All!

1. Eclipse uses AST based concept for Refactoring. Refactoring is a "Complete Operation",
- Preceded by set of Preconditions
- Transformation
- Follwed by set of PostConditions

Example:
After applying "Rename Variable" refactoring, Eclipse immediately makes impact analysis & changes the source code

Queries:
Does it also change AST?

If Yes, then it must unparse AST & perform re-analysis to collect results based on new change,

But I am wondering how eclipse does it too fast. For millions of lines of code, static analyis takes lots of time.

Analysis means:
Variable Use
Variable Def
Aliasing Info
Call Graph
gen kill
reaching & liveness
etc...

[Updated on: Mon, 13 December 2010 12:23]

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Re: Eclipse Refactoring [message #644635 is a reply to message #644556]

Mon, 13 December 2010 14:53

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Dharam,

Comments below.

Dharam wrote:
> Hello All!
>
> 1. Eclipse uses AST based concept for Refactoring. Refactoring is a
> "Complete Operation", - Preceded by set of Preconditions
> - Transformation
> - Follwed by set of PostConditions
>
> Example:
> After applying "Rename Variable" refactoring, Eclipse immediately
> makes impact analysis & changes the source code?
>
> Queries:
> Does it also change AST?
Yes.
>
> If Yes, then it must unparse AST & perform re-analysis to collect
> results based on new change,
The analysis is done using the AST.
>
> But I am wondering how eclipse does it too fast. For millions of
> lines of code, static analyis takes lots of time.
The incremental compiler is very smart and knows where to focus the
attention.
>
> Analysis means:
> Variable Use
> Variable Def
> Aliasing Info
> Call Graph gen kill reaching & liveness
> etc...

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Eclipse Refactoring [message #644747 is a reply to message #644635]

Tue, 14 December 2010 05:06

Dharam

Messages: 18
Registered: December 2010

Junior Member

Thanks.

I agree with you, changing & unparsing AST is somewht starightforward task. But collecting static analysis results each time after refactoring very expensive,

def use / use def
gen kill
aliasing info for each reference variable
liveness
reaching.

Would you pls eloborate more on this? I would also like to request if you can suggest me eclipse library for static analyis used in refactoring.

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