Eclipse Community Forums: Newcomers

Help

Home

Home » Newcomers » Newcomers » Eclipse Refactoring (How does Eclipse Re-Analyse source code after Refactoring?)

Show: Today's Messages :: Show Polls :: Message Navigator

Eclipse Refactoring [message #644556]

Mon, 13 December 2010 04:35

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 07:23]

Report message to a moderator

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

Mon, 13 December 2010 09:53

Ed Merks
Messages: 24560
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...

Report message to a moderator

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

Tue, 14 December 2010 00:06

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.

Report message to a moderator

Previous Topic:	Problem with imports
Next Topic:	Search results list

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri May 24 16:41:02 EDT 2013