- Glasgow-haskell-users

GADTs and fundeps
by Bjorn Bringert 06 Apr '05

06 Apr '05

GADTs and fundeps don't seem to interact in the way that I (perhaps naively) expect. I expected that for each case, the type variables would be instantiated according to the type of the constructors, and then the fundep would be used to figure out the result type. This does not seem to work, or am I doing something stupid? /Bjorn {-# OPTIONS_GHC -fglasgow-exts #-} data Succ n data Zero class Plus x y z | x y -> z instance Plus Zero x x instance Plus x y z => Plus (Succ x) y (Succ z) infixr 5 ::: data List :: * -> * -> * where Nil :: List a Zero (:::) :: a -> List a n -> List a (Succ n) {- GHC 6.4 says: Couldn't match the rigid variable `y' against `Succ z' `y' is bound by the type signature for `append' Expected type: List a y Inferred type: List a (Succ z) In the expression: x ::: (append xs ys) In the definition of `append': append (x ::: xs) ys = x ::: (append xs ys) -} append :: Plus x y z => List a x -> List a y -> List a z append Nil ys = ys append (x ::: xs) ys = x ::: append xs ys

1 0

RE: Functional dependencies, principal types, and decidable typechecking
by Simon Peyton-Jones 06 Apr '05

06 Apr '05

Manuel Your short program tickles a lot of different questions. Here's an explanation. Simon | Assume the following type class declarations with functional | dependencies: Actually much of the behaviour you see happens without fundeps. | > {-# OPTIONS -fglasgow-exts #-} | > | > class C a b c | a b -> c where | > foo :: (a, b) -> c | > | > instance C a a r => C a (b, c) r where | > foo (a, (b, c)) = foo (a, a) You are already on dodgy ground here, because the instance decl doesn't guarantee that the bit before the => is smaller than the bit after the =>. E.g. context reduction could go: C (Int,Int) (Bool, Bool) r --> C (Int,Int) (Int,Int) r --> C (Int,Int) (Int,Int) r So [Point 1]: GHC should require -fallow-undecidable-instances if you use repeated type variables before the =>. | Now, in GHCi (version 6.4), | | > *FDs> let bar x = foo ((x, x), (x, x)) | > *FDs> :t bar | > bar :: (C (a, a) (a, a) c) => a -> c | | but GHC is also happy to accept the more general type | | > bar :: a -> c | > bar x = foo ((x, x), (x, x)) There are two separate things going on here [Point 2] GHC postpones context reduction until it's forced to do it (except if a single step will eliminate the dictionary altogether). Example: data T a = T a instance Eq (T a) bar x = [T x] == [] GHC will *infer* bar :: Eq [T a] => a -> Bool, but it will happily *check* bar :: a -> Bool bar x = [T x] == [] The reason for this lazy context reduction is overlapping instances; in principle there might be more instances for Eq [T a] at bar's call site. But now I look at it again, I think it would be OK to postpone context reduction only if there actually were overlapping instances (right here at bar's defn). That might be a good idea because it'd give less confusing types perhaps. However, note that the two types are indeed equivalent -- both are more general than the other. It's like saying (Eq Int => t) <= t, and vice versa. [Point 3] As Iavor notes, yes, GHC is building recursive dictionaries. Suppose GHC is trying to find evidence for constraint C from a set of constraints (with evidence provided) D. Suppose it finds an instance decl D' => C which matches C. Then it tries to prove the constraints D'. The new bit is that it adds C to D before trying to prove D'. That's all! This is Jolly Useful sometimes. (See John Hughes's paper about restricted type synonyms for example.) It's a bit like infinite data structures. ML doesn't let you build them, so there's a static error. Haskell does, and that is sometimes just what you want; and sometimes gives you runtime divergence (e.g. take the length of an infinite list). In the same way, this recursive-dictionary thing is sometimes just what you want; but sometimes gives you runtime divergence instead of a static error. | Again, in GHCi, | | > *FDs> let bar x = foo ((x::Int, x), (x, x)) | > *FDs> :t bar | > bar :: Int -> () | | (which by itself is bizarre) This is the first time when the functional dependency plays a role. >From bar's right-hand-side we get the constraint (C (Int,Int) (Int,Int) c), and the type (Int -> c). Now GHC tries to decide what to quantify over. Shall we quantify over c? Well, no. GHC never quantifies over type variables that are free in the environment (of course) OR are fixed by functional dependencies from type variables free in the environment. In this case the functional dependencies tell us that since (Int,Int) is obviously completely fixed, then there's no point in quantifying over c. So bar is not quantified. The constraint (C (Int,Int) (Int,Int) c) is satisfied via the recursive dictionary thing, leaving 'c' completely unconstrained. So GHC chooses c to be (), because it doesn't like to leave programs with completely free type variables. | but it also accepts | | > bar :: Int -> c | > bar x = foo ((x::Int, x), (x, x)) Here you are *telling* GHC what to quantify over, so the inference of what to quantify doesn't happen.

3 2

Functional dependencies, principal types, and decidable type checking
by Manuel M T Chakravarty 05 Apr '05

05 Apr '05

Assume the following type class declarations with functional dependencies: > {-# OPTIONS -fglasgow-exts #-} > > class C a b c | a b -> c where > foo :: (a, b) -> c > > instance C a a r => C a (b, c) r where > foo (a, (b, c)) = foo (a, a) Now, in GHCi (version 6.4), > *FDs> let bar x = foo ((x, x), (x, x)) > *FDs> :t bar > bar :: (C (a, a) (a, a) c) => a -> c but GHC is also happy to accept the more general type > bar :: a -> c > bar x = foo ((x, x), (x, x)) Again, in GHCi, > *FDs> let bar x = foo ((x::Int, x), (x, x)) > *FDs> :t bar > bar :: Int -> () (which by itself is bizarre), but it also accepts > bar :: Int -> c > bar x = foo ((x::Int, x), (x, x)) For those who expected GHC to diverge during type checking with the above class declaration, console yourself by knowing that Hugs (Feb'05) does diverge...well, it invokes the emergency break: > Hugs.Base> :l FDs > ERROR "./FDs.hs" - > *** The type checker has reached the cutoff limit while trying to > *** determine whether: > *** C (Int,Int) (Int,Int) a > *** can be deduced from: > *** () > *** This may indicate that the problem is undecidable. However, > *** you may still try to increase the cutoff limit using the -c > *** option and then try again. (The current setting is -c40) Manuel

2 2

RE: compiling application with prof results in undefined references
by Simon Marlow 04 Apr '05

04 Apr '05

On 04 April 2005 12:07, Niels van der Velden wrote: > Hi all, > I have an application that uses a package called 'uust'. > Normally I would compile using; > > ghc -O2 -o genAST -fglasgow-exts -package uust GenAst.hs > > This works fine. However, I want to profile my application and > therefore need to add -prof. The uust package was compiled for > profiling (there are _p files), but when I compile using; > > ghc -prof -O2 -o genAST -fglasgow-exts -package uust GenAst.hs > > I get undefined references during the link phase; > > GenAST.o(.rodata+0xe5f0): undefined reference to > `UUziParsingziInterface_lvl8_closure' > GenAST.o(.rodata+0xe630): undefined reference to > `UUziParsingziInterface_zdwevalStepsIOzq_closure' > GenAST.o(.rodata+0xe6cc): undefined reference to > `UUziPrettyziBasic_lvl19_closure' > GenAST.o(.rodata+0xe6e8): undefined reference to > `UUziParsingziInterface_lvl8_closure' > GenAST.o(.rodata+0xe724): undefined reference to > `UUziParsingziInterface_zdwevalStepsIOzq_closure' > > and many many more. I'm kinda in the dark here what I'm doing wrong. > Can anyone help? It looks like there's something wrong with the profiling version of your uust package: either some of the object code is missing, or it doesn't correspond to the .p_hi files. I would check your uust package build. Cheers, Simon

2 2

RE: Rebindable syntax for monads and arrows
by Simon Peyton-Jones 04 Apr '05

04 Apr '05

Ross, Amr, OK. I've done rebindable syntax for do-notation, in the HEAD. Care to try it? What this means is that, with -fno-implicit-prelude, do { pat <- e; Q } has the same static semantics as e >>= (\x -> case x of { pat -> do { Q }; other -> fail "urk") where the (>>=) is whatever (>>=) happens to be in scope at that point. The situation for arrows is unchanged; no rebindable syntax. (Partly because the detailed spec is unclear.) It does *not* work for mdo, because mdo uses (>>=) at a polymorphic type. Just do-notation. Which is, I hope, enough for you. Simon | -----Original Message----- | From: Amr A Sabry [mailto:sabry@cs.indiana.edu] | Sent: 24 January 2005 19:40 | To: Simon Peyton-Jones | Cc: Amr A Sabry; ross(a)soi.city.ac.uk | Subject: Re: Rebindable syntax for monads and arrows | | > You've convinced me about the monad one; GHC doesn't implement its own | > manual! And it's not hard to fix. So it's on my to-do list. | | :-) | | > Meanwhile, I'd like to know: if I did the monad thing, would that be | > useful to you, or just a generally good thing. And if the former, how | > useful? That is, how hard should I try to get to it?! | | It would definitely be useful but not critical at this point. | | Thanks. --Amr

1 0

compiling application with prof results in undefined references
by Niels van der Velden 04 Apr '05

04 Apr '05

Hi all, I have an application that uses a package called 'uust'. Normally I would compile using; ghc -O2 -o genAST -fglasgow-exts -package uust GenAst.hs This works fine. However, I want to profile my application and therefore need to add -prof. The uust package was compiled for profiling (there are _p files), but when I compile using; ghc -prof -O2 -o genAST -fglasgow-exts -package uust GenAst.hs I get undefined references during the link phase; GenAST.o(.rodata+0xe5f0): undefined reference to `UUziParsingziInterface_lvl8_closure' GenAST.o(.rodata+0xe630): undefined reference to `UUziParsingziInterface_zdwevalStepsIOzq_closure' GenAST.o(.rodata+0xe6cc): undefined reference to `UUziPrettyziBasic_lvl19_closure' GenAST.o(.rodata+0xe6e8): undefined reference to `UUziParsingziInterface_lvl8_closure' GenAST.o(.rodata+0xe724): undefined reference to `UUziParsingziInterface_zdwevalStepsIOzq_closure' and many many more. I'm kinda in the dark here what I'm doing wrong. Can anyone help? regards, Niels PS I'm using ghc-6.4 (and have ghc-prof of course).

1 0

Inlining question
by Ian Lynagh 03 Apr '05

03 Apr '05

Hi all, With foo.hs below, if I compile normally then it takes about 70 seconds to run: $ rm -f *.o *.hi foo $ ghc -cpp -Wall -O2 foo.hs -o foo $ time ./foo real 1m10.266s user 1m9.698s sys 0m0.521s If I turn up the inlining threshold then it takes only about 13 seconds: $ rm -f *.o *.hi foo $ ghc -cpp -Wall -O2 foo.hs -o foo -funfolding-use-threshold=20 $ time ./foo real 0m13.313s user 0m12.838s sys 0m0.450s However, if I copy the definition of shift from base/GHC/Word.hs then it also takes around 13 seconds: $ rm -f *.o *.hi foo $ ghc -cpp -Wall -O2 foo.hs -o foo -DCOPY -fglasgow-exts $ time ./foo real 0m13.394s user 0m12.843s sys 0m0.454s Why does it matter whether the definition is in the current file or is imported from the standard libraries? Thanks Ian module Main (main) where import Foreign.Ptr (Ptr) import Foreign.Marshal.Array (mallocArray, advancePtr) import Foreign.Storable (peek, poke) import Data.Bits ((.|.)) #ifdef COPY import Prelude hiding (Int) import GHC.Exts (shiftRL#, shiftL#) import GHC.Word (Word32(W32#)) import GHC.Base (Int(I#), narrow32Word#, negateInt#, (>=#)) #else import Data.Word (Word32) import Data.Bits (shift) #endif main :: IO () main = do p <- mallocArray 104857600 mapM_ (\_ -> foo p 104857600) [1..10 :: Int] foo :: Ptr Word32 -> Int -> IO () foo p i | p `seq` i `seq` False = undefined foo _ 0 = return () foo p n = do x <- peek p poke p (shift x (-1) .|. shift x (-2) .|. shift x (-3) .|. shift x (-4)) foo (p `advancePtr` 1) (n - 1) #ifdef COPY -- Defn from libraries/base/GHC/Word.hs shift :: Word32 -> Int -> Word32 shift (W32# x#) (I# i#) | i# >=# 0# = W32# (narrow32Word# (x# `shiftL#` i#)) | otherwise = W32# (x# `shiftRL#` negateInt# i#) #endif

2 1

simple question
by Peter Hercek 02 Apr '05

02 Apr '05

What is $ function good for?

3 2

package.conf in ghc 6.4
by Robert van Herk 01 Apr '05

01 Apr '05

Hi all, I am using ghc 6.4 on a Mac, with the binary distribution available from your site. I have a suspision that the package.conf file distributed with it, is incorrect. I am trying to install HSQL. During installation, it issues the command: /usr/local/bin/ghc-pkg -u -g -i hsql.pkg with yields: Reading package info from "hsql.pkg" ghc-pkg: Line 1: Invalid syntax (no colon after field name) To me, the hsql.pkg file looks sane: Package {name = "hsql", auto=True, import_dirs = ["/Users/rherk/soft/HSQL/lib/HSQL/GHC/imports"], source_dirs = [], library_dirs = ["/Users/rherk/soft/HSQL/lib/HSQL/GHC","/Users/rherk/soft/mysql/lib/mysql"], hs_libraries = ["HSsql"], extra_libraries = ["mysqlclient","mysqlclient","m","z"], include_dirs = [], c_includes = [], package_deps = ["base"], extra_ghc_opts = [], extra_cc_opts = [], extra_ld_opts = [], framework_dirs = [], extra_frameworks = [] } However, the package.conf file looks somewhat strange (and huge). I have attached it to this mail. Could you please tell me what is wrong? Thanks! 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[], frameworks = [], haddockInterfaces = [], haddockHTMLs = []},InstalledPackageInfo {package = PackageIdentifier {pkgName = "text", pkgVersion = Version {versionBranch = [1,0], versionTags = []}}, license = BSD3, copyright = "", maintainer = "libraries(a)haskell.org", author = "", stability = "", homepage = "", pkgUrl = "", description = "", category = "", exposed = False, exposedModules = ["Pretty","RegexString","Html","HtmlBlockTable","Parsec","ParsecChar","ParsecCombinator","ParsecError","ParsecExpr","ParsecLanguage","ParsecPerm","ParsecPos","ParsecPrim","ParsecToken"], hiddenModules = [], importDirs = ["/usr/local/lib/ghc-6.4/hslibs-imports/text"], libraryDirs = ["/usr/local/lib/ghc-6.4"], hsLibraries = ["HStext"], extraLibraries = [], includeDirs = [], includes = [], depends = [PackageIdentifier {pkgName = "lang", pkgVersion = Version {versionBranch = [1,0], versionTags = []}},PackageIdentifier {pkgName = "parsec", pkgVersion = Version {versionBranch = [1,0], versionTags = []}}], 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ghc-6.5 (development version) for Mac OS X
by Gregory Wright 31 Mar '05

31 Mar '05

HI, For darwinports users on Mac OS X who just have to live on the bleeding edge, a new port of the development version of GHC is available. It builds from the latest cvs. (So you take your chances. There's no guarantee that the build process will work, not trash your machine, not render your city a smoking, radiating ruin or change the signature of the spacetime metric. Although the last two are believed unlikely.) The executables all have the suffix -6.5, so you can install along with your regular ghc without conflict. For more information on darwinports, see http://darwinports.opendarwin.org Best Wishes, Greg Gregory Wright

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