gwtc X closure optimizations

[Magno Machado]

I was impressed to see the results achieved on gwt 2.5 by combining the gwt compiler and closure compiler.

Well, I always thought there's nothing that closure could do that the gwt compiler couldn't already do, because gwtc have a lot more information about the source than closure compiler.

So I wonder what kind of optimizations closure is doing that were not already done by the gwt compiler?

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Magno Machado Paulo
http://blog.magnomachado.com.br
http://code.google.com/p/emballo/

[Thomas Broyer]

On Thursday, July 5, 2012 5:37:08 AM UTC+2, Magno Machado wrote:

I was impressed to see the results achieved on gwt 2.5 by combining the gwt compiler and closure compiler.

Well, I always thought there's nothing that closure could do that the gwt compiler couldn't already do, because gwtc have a lot more information about the source than closure compiler.

Yes and no: Closure has "static typing" via JSDoc annotations, and uses the same kind of monolithic compilation (i.e. I know everything about what will run, so I know what is never used that I can remove).

So I wonder what kind of optimizations closure is doing that were not already done by the gwt compiler?

One small optimization I've read on the Closure Compiler group that I know GWT doesn't do: ["ab", "cd", "ef", "ghij"] is compiled into "ab,cd,ef,ghij".split(",") !

(it's more in terms of perfs than in code size I guess though).

I don't know about the other differences.

[Alan Leung]

A few more noteworthy ones:

Variable name reuse:

  var x = .....;  print(x); var y = ......; print(y)

  becomes

    var x = .....;  print(x);   x  = ......; print(x)

More aggressive inlining with variables and functions.

A lot more small optimizations that saves a char here and there.

Closure Compiler would also put more effort into your JSNI code for obvious reasons.

-Alan

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