hi,
if been thinking about an haskell interpreter to, because of erlang's
otp. its syntax is a mess, but its scalability is win.
since erlang runs in its vm ("interpreted") is there a need for a real
haskell interpreter, or can there be a compiled haskell/otp with
hotswapping, scaling and stuff?
now back on topic, i wrote "real" haskell interpreter because there is
the hint[1] package, which wrappes the ghc api.
now i dont know what more the plugin package provides, but i thought
hint is like is successor (since lambdabot used plugins and now uses
mueval, which in turn uses hint ;). please correct me.
have fun
martin
[1]: http://hackage.haskell.org/package/hint
On 16.07.2010 06:06, Andy Stewart wrote:
Don Stewart<d...@galois.com> writes:
lazycat.manatee:
Hi all,
I'm research to build a hot-swap Haskell program to developing itself in
Runtime, like Emacs.
Essentially, Yi/Xmonad/dyre solution is "replace currently executing"
technology:
re-compile new code with new binary entry
when re-compile success
$ do
save state before re-launch new entry
replace current entry with new binary entry (executeFile)
store state after re-launch new entry
There are some problems with re-compile solution:
1) You can't save *all* state with some FFI code, such as gtk2hs, you
can't save state of GTK+ widget. You will lost some state after
re-launch new entry.
2) Sometimes re-execute is un-acceptable, example, you running some command
in temrinal before you re-compile, you need re-execute command to
restore state after re-launch, in this situation re-execute command is
un-acceptable.
I wonder have a better way that hot-swapping new code without
re-compile/reboot.
Well, the other approach to reloadable modules, using either object code
plugins, or bytecode plugins, giving you module-level granularity.
Thanks for your reply.
I have read your papers : "Dynamic Application From the Group Up" and "Plugging
Haskell In"
In "Dynamic Application From the Group Up", you introduction how to use
re-compile technology implement source-code level hot-swapping.
In "Plugging Haskell In", you introduction to how to buld hot-swapping
with object-code level.
Yes, Dynamic linking can add new code to a running program, but how to
replace existing binding with new ones?
Looks you still need some reboot when you do *replace* and not just *add*.
Infact, reboot is okay, only problem is *keep state*, some *static state*
is easier to re-build, example, if you want restore editor buffer state, you
just need save (filepath, cursorPosition), you can re-open file and
restore cursor position after reboot process.
Difficult is *Stream State*, such as:
delete operation in file-manager
command running in temrinal
network communications in browser
It's really difficult to restore those state, and re-execute is
un-acceptable sometimes.
You can found the screenshot of my project at
http://www.flickr.com/photos/48809...@n02/
Currently, the closest library to implement dynamic linking is your
plugins package (http://hackage.haskell.org/package/plugins-1.4.1),
i really want to write some code to test it, unfortunately, it's
broken with Cabal-1.8.0.4 that can't compile with ghc-6.12.x/ghc-6.12.3,
can you fix it if you have time? It's so great package...
I'm looking for some paper about "Haskell and hot-swapping".
Any paper or suggestion are welcome!
-- Andy
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