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Jun 30, 2009 1:40:33 PM (
= Plans for GHC 6.10 =
We expect to release GHC 6.10 around ICFP 2008.
* [http://www.haskell.org/pipermail/glasgow-haskell-users/2008-September/015539.html Beta released].
== Things that are done already ==
* Several '''language extensions''' advertised in the [wiki:Status/Nov07 November 2007 status report]:
* Improvements to record syntax
* View patterns
* Generalised list comprehensions
'''Done''': these are all in the HEAD already.
* '''Parallel garbage collection''' (see [http://research.microsoft.com/%7Esimonpj/papers/parallel-gc/index.htm Parallel generational-copying garbage collection with a block-structured heap]). '''Done'''.
* '''External Core''' (output only) is working again, thanks to Tim Chevalier.
* Better '''versioning''' to support separate compilation based on MD5 fingerprints. Already done (and documented! see [wiki:Commentary/Compiler/RecompilationAvoidance].
* GHC now uses '''libffi''' to implement parts of the FFI, replacing some of the home-grown and very architecture-specific code we had to do this. Amongst other benefits, this will ease the task of porting GHC in the future. Done; but ''maybe use it to solve the SE Linux paranoia problem?''
* '''Backwards compatibility''': we've introduce "base3-compat", a backwards-compatible version of the base library
that will provide essentially the same API as the base library that shipped with GHC 6.8.3, so that code
depending on base-3 will continue to just work.
* '''Haddock 2'''
* Build it with GHC (maybe ship it with GHC too)
* Documentation for GHC API done via Haddock 2
* '''Extensible exceptions''', along the lines of Simon's paper [http://www.haskell.org/~simonmar/papers/ext-exceptions.pdf "An Extensible Dynamically-Typed Hierarchy of Exceptions"]. This is mainly a library change.
* '''Haddock 2''' (see also #1964 (GHC.Prim)). ('''Ian Lynagh''')
* '''GHC API''' improvement: '''Thomas Schilling''' is doing a SoC project. Preserve comments and pragmas, generic traversals (#1467, #1886, GhcApiStatus). We'll ship whatever Thomas has committed by then.
* '''[http://haskell.org/haskellwiki/GHC/Indexed_types Type families]''', fully working. ''Manuel Chakravarty and Simon PJ''
* '''[http://haskell.org/haskellwiki/GHC/Data_Parallel_Haskell Nested data parallelism]''', in some form. ''Roman Leshchinskiy, Gabriele Keller, Manuel Chakravarty, Simon PJ''
* More library reorg (#1338). The goal here is to shift stuff out of boot-libs and into the Haskell Library Platform, which is independently upgradable. Not hugely urgent, nice to have.
* `^C` should raise an exception by default (also SIGPIPE, see #1619, #2301). Nearly done! But not quite complete if you fork another process. This latter part is lower priority.
== Things we plan to do for sure ==
* '''Ship the Haskell Library Platform''' instead of 'extralibs'. '''Don and Duncan''' are leading.
= Beyond 6.10 =
This is a list of things that are floating about in our minds for what to do beyond 6.10. Nothing is decided, and these items vary wildly in their size.
* '''[wiki:Commentary/Compiler/NewCodeGen Back-end revamp]''' (see also #1501). '''John Dias''' is in charge. For 6.10 we will make sure that the whole existing path still exists, so we can choose at a late date whether to rely on the new path or not.
* '''Unicode support for text I/O'''. This means adding Unicode encoding/decoding for Text I/O handles. ('''Simon Marlow''': a few days work.)
* Consensus was that Text I/O should always use the current locale encoding.
* You can elect to have no encoding by opening in binary mode, but that's all.
* '''Shared libraries''', as a result of Clemens Fruhwirth's Summer of Code project. (#1876) '''Simon Marlow''': about a week's work.
* Binaries get much smaller
* Compile a package on Windows to a DLL; it just works
* C program (or Excel) that calls multiple Haskell functions gets just one copy of the RTS, rather than one per DLL as now.
* Performance penalty, but too small to measure
* '''Opaque interfaces''' (optionally), so you can upgrade a library without recompiling.
* '''Parallelism'': better profiling tools.
* '''Visual Haskell''': a Visual Studio plugin. There is one, but it has suffered bit-rot.
* '''GHC as a platform''' is the aspiration that it should be easy to plug extensions into GHC, and easy to use GHC to extend other software.
* '''Static verification''' along the lines of Dana Xu's work.
* '''Finish System.Process revamp''' (#2233)
* Binary package DB, or at least make the one-file-per package work (#593, #723, #2089)