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JP Moresmau | 25 Jan 2013 15:30
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Fastest way to reload module with GHC API

Hello, I just want to be sure of what's the fastest way to reload a module with the GHC API.
I have a file whose path is fp
I load the module with:
addTarget Target { targetId = TargetFile fp Nothing, targetAllowObjCode = True, targetContents = Nothing }
Then I load the module
load LoadAllTargets
And when I want to reload the module (the contents of fp have changed) I do:
removeTarget (TargetFile fp Nothing)      
load LoadAllTargets
and then I rerun my initial code (addTarget, load)

This works well, I don't get any errors about duplicates, the information I extract from the module is updated properly. But is it the most efficient, or can I achieve the same thing faster (I'm looking at improving the performance of my BuildWrapper code and by consequence of EclipseFP)?

Thanks!

--
JP Moresmau
http://jpmoresmau.blogspot.com/ 
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Simon Marlow | 25 Jan 2013 16:33
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Re: Fastest way to reload module with GHC API

On 25/01/13 14:30, JP Moresmau wrote:
> Hello, I just want to be sure of what's the fastest way to reload a
> module with the GHC API.
> I have a file whose path is fp
> I load the module with:
> addTarget Target { targetId = TargetFile fp Nothing, targetAllowObjCode
> = True, targetContents = Nothing }
> Then I load the module
> load LoadAllTargets
> And when I want to reload the module (the contents of fp have changed) I do:
> removeTarget (TargetFile fp Nothing)
> load LoadAllTargets
> and then I rerun my initial code (addTarget, load)

You should be able to just invoke 'load LoadAllTargets' and omit the 
intermediate remove/load step.  Or is there a reason you want to remove 
the target?

Cheers,
	Simon
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JP Moresmau | 25 Jan 2013 17:02
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Re: Fastest way to reload module with GHC API

When I do that (only adding the target once and just doing load after the file has changed) the changes in the file are not taken into account (getNamesInScope for example doesn't give me the name of a type added inside the file). I probably have my stupid hat on (friday afternoon...), but when I do remove/load in between it works...

Thanks


On Fri, Jan 25, 2013 at 4:33 PM, Simon Marlow <marlowsd <at> gmail.com> wrote:
On 25/01/13 14:30, JP Moresmau wrote:
Hello, I just want to be sure of what's the fastest way to reload a
module with the GHC API.
I have a file whose path is fp
I load the module with:
addTarget Target { targetId = TargetFile fp Nothing, targetAllowObjCode
= True, targetContents = Nothing }
Then I load the module
load LoadAllTargets
And when I want to reload the module (the contents of fp have changed) I do:
removeTarget (TargetFile fp Nothing)
load LoadAllTargets
and then I rerun my initial code (addTarget, load)

You should be able to just invoke 'load LoadAllTargets' and omit the intermediate remove/load step.  Or is there a reason you want to remove the target?

Cheers,
        Simon




--
JP Moresmau
http://jpmoresmau.blogspot.com/ 
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Glasgow-haskell-users <at> haskell.org
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Simon Marlow | 25 Jan 2013 17:29
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Re: Fastest way to reload module with GHC API

Has the file's modification time changed?  If you're doing this very 
quickly (within 1 second) then you might run into this:

http://hackage.haskell.org/trac/ghc/ticket/7473

Cheers,
	Simon

On 25/01/13 16:02, JP Moresmau wrote:
> When I do that (only adding the target once and just doing load after
> the file has changed) the changes in the file are not taken into account
> (getNamesInScope for example doesn't give me the name of a type added
> inside the file). I probably have my stupid hat on (friday
> afternoon...), but when I do remove/load in between it works...
>
> Thanks
>
>
> On Fri, Jan 25, 2013 at 4:33 PM, Simon Marlow <marlowsd <at> gmail.com
> <mailto:marlowsd <at> gmail.com>> wrote:
>
>     On 25/01/13 14:30, JP Moresmau wrote:
>
>         Hello, I just want to be sure of what's the fastest way to reload a
>         module with the GHC API.
>         I have a file whose path is fp
>         I load the module with:
>         addTarget Target { targetId = TargetFile fp Nothing,
>         targetAllowObjCode
>         = True, targetContents = Nothing }
>         Then I load the module
>         load LoadAllTargets
>         And when I want to reload the module (the contents of fp have
>         changed) I do:
>         removeTarget (TargetFile fp Nothing)
>         load LoadAllTargets
>         and then I rerun my initial code (addTarget, load)
>
>
>     You should be able to just invoke 'load LoadAllTargets' and omit the
>     intermediate remove/load step.  Or is there a reason you want to
>     remove the target?
>
>     Cheers,
>              Simon
>
>
>
>
> --
> JP Moresmau
> http://jpmoresmau.blogspot.com/
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JP Moresmau | 28 Jan 2013 17:07
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Re: Fastest way to reload module with GHC API

Yes, thank you Simon, my test works if I wait at least 1 second before the two loads, so I'd say I run exactly into that issue. So I can adapt my code to only remove the target if the files do not give me a time difference.

Thanks a million!

JP


On Fri, Jan 25, 2013 at 5:29 PM, Simon Marlow <marlowsd <at> gmail.com> wrote:
Has the file's modification time changed?  If you're doing this very quickly (within 1 second) then you might run into this:

http://hackage.haskell.org/trac/ghc/ticket/7473

Cheers,
        Simon


On 25/01/13 16:02, JP Moresmau wrote:
When I do that (only adding the target once and just doing load after
the file has changed) the changes in the file are not taken into account
(getNamesInScope for example doesn't give me the name of a type added
inside the file). I probably have my stupid hat on (friday
afternoon...), but when I do remove/load in between it works...

Thanks


On Fri, Jan 25, 2013 at 4:33 PM, Simon Marlow <marlowsd <at> gmail.com
<mailto:marlowsd <at> gmail.com>> wrote:

    On 25/01/13 14:30, JP Moresmau wrote:

        Hello, I just want to be sure of what's the fastest way to reload a
        module with the GHC API.
        I have a file whose path is fp
        I load the module with:
        addTarget Target { targetId = TargetFile fp Nothing,
        targetAllowObjCode
        = True, targetContents = Nothing }
        Then I load the module
        load LoadAllTargets
        And when I want to reload the module (the contents of fp have
        changed) I do:
        removeTarget (TargetFile fp Nothing)
        load LoadAllTargets
        and then I rerun my initial code (addTarget, load)


    You should be able to just invoke 'load LoadAllTargets' and omit the
    intermediate remove/load step.  Or is there a reason you want to
    remove the target?

    Cheers,
             Simon




--
JP Moresmau
http://jpmoresmau.blogspot.com/




--
JP Moresmau
http://jpmoresmau.blogspot.com/ 
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