[Haskell-cafe] Thunks

[Jason Dagit]

On Thu, Oct 14, 2010 at 1:53 PM, Mihai Maruseac <mihai.maruseac at gmail.com>wrote:

> Hi,
>
> Is there a way to determine the order in which thunks are created and
> expanded/evaluated in Haskell (GHC)? I'm looking mainly at some
> existing interface but if there is only something in the GHC source it
> will suffice.
>

You'll want to look at STG (spineless tagless G-Machine).  See here and the
linked paper:
http://www.haskell.org/haskellwiki/Ministg

I don't know of any way to examine this for a running program.  You can get
GHC to spit out core and STG using -ddump-core and -ddump-stg flags:
http://www.haskell.org/ghc/docs/6.12.2/html/users_guide/options-debugging.html#id595218

I hope that helps,
Jason
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