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Looks fantastic. With the traction Coffeescript is getting I wouldn't be surprised to see it eventually execute directly inside v8 or similar, bypassing the ja

Looks fantastic. With the traction Coffeescript is getting I wouldn't be surprised to see it eventually execute directly inside v8 or similar, bypassing the javascript compilation altogether.

iambot 15y ago
i cannot wait
dualogy 15y ago
Even if V8 could do this, I'd probably continue to compile my stuff manually (it's so easy) so I wouldn't have to wait for Node / Chrome to update to the newest V8 when there is a new version of the CS compiler that I might need "now". Also it'd be the only way for me to be sure my CS is compiled by the proper compiler version.
- coenhyde 15y ago
  I was more thinking coffee script development for nodejs. The browsers on a whole have only just got javascript sorted. I think it's too much to ask for native coffee script support in the browser.
rpearl 15y ago
If you translate your coffeescript to javascript serverside, then there is no overhead on Jaegermonkey or v8 (obviously). Although I doubt that any of the browsers will ever support it directly, porting coffeescript to run directly on top of Jaegermonkey or v8 wouldn't be too hard, since there is a direct translation from coffeescript to javascript. You would only need a new front end--if you emit Spidermonkey/Hydrogen bytecode, the relevant engine can JIT it. On a slightly related note, a friend of mine is working on this: https://wiki.mozilla.org/DevTools/Features/SourceMap https://wiki.mozilla.org/DevTools/Features/SourceMap Which, while not compiling directly, will allow you to map the generated JS directly back to the coffeescript source.
- mraleph 15y ago
  > if you emit Spidermonkey/Hydrogen bytecode Hydrogen is not a bytecode, it is highlevel intermediate representation for optimizing compiler generated from AST. There is currently: 1) no frontend in V8 that accepts hydrogen in some serialized form; 2) no way to generate non-optimized (non-specialized) code from hydrogen which is quite crucial to make adaptive optimization pipeline running.

Looks fantastic. With the traction Coffeescript is getting I wouldn't be surprised to see it eventually execute directly inside v8 or similar, bypassing the javascript compilation altogether.

iambot 15y ago

i cannot wait

dualogy 15y ago

Even if V8 could do this, I'd probably continue to compile my stuff manually (it's so easy) so I wouldn't have to wait for Node / Chrome to update to the newest V8 when there is a new version of the CS compiler that I might need "now". Also it'd be the only way for me to be sure my CS is compiled by the proper compiler version.

coenhyde 15y ago
I was more thinking coffee script development for nodejs. The browsers on a whole have only just got javascript sorted. I think it's too much to ask for native coffee script support in the browser.

rpearl 15y ago

If you translate your coffeescript to javascript serverside, then there is no overhead on Jaegermonkey or v8 (obviously). Although I doubt that any of the browsers will ever support it directly, porting coffeescript to run directly on top of Jaegermonkey or v8 wouldn't be too hard, since there is a direct translation from coffeescript to javascript. You would only need a new front end--if you emit Spidermonkey/Hydrogen bytecode, the relevant engine can JIT it. On a slightly related note, a friend of mine is working on this: https://wiki.mozilla.org/DevTools/Features/SourceMap https://wiki.mozilla.org/DevTools/Features/SourceMap Which, while not compiling directly, will allow you to map the generated JS directly back to the coffeescript source.

mraleph 15y ago
> if you emit Spidermonkey/Hydrogen bytecode Hydrogen is not a bytecode, it is highlevel intermediate representation for optimizing compiler generated from AST. There is currently: 1) no frontend in V8 that accepts hydrogen in some serialized form; 2) no way to generate non-optimized (non-specialized) code from hydrogen which is quite crucial to make adaptive optimization pipeline running.