- Glasgow-haskell-users

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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3 2

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

1 0

Oops [Fwd: Re: Allowing duplicate instances in GHC 6.4]
by Robert van Herk 31 Mar '05

31 Mar '05

Sorry, this is the compiler error I get: No instances for (KeyHasValue MyKeyVal k' v', Datasource.Tools.FakePrelude.TypeEq Float k' z, Datasource' z [MyKeyVal] [MyKeyVal] Float Int) When I am trying to do do { createJoinedDS' x x; (joined,(v::Maybe Int)) <- _dsread joined (2.0::Float); } Robert

2 3

Re: Oops [Fwd: Re: Allowing duplicate instances in GHC 6.4]
by Robert van Herk 31 Mar '05

31 Mar '05

> See change above! > > Also note type of fundep for Datasource should now be: > > class Datasource s k v | s -> k v where ... > > I see.... But the cool thing was, that my datasources were generic, in the sence that they could store multiple k's and v's. Now, they would be unique for the actual storage mechanism used, meaning, for example, that I could only read values from 1 table, if I'd instantiate the datasource for a database coupling. Currently, I use the Boilerplate approach to make it possible to store multiple types in one datasource, for example: data MyKeyVal = IntXString Int String | FloatXInt Float Int deriving (Eq, Ord, Show) Furthermore, I generate an instance of KeyHasValue, to tell my framework which keys are valid for a datasource, for example: instance KeyHasValue MyKeyVal Int String where constructor = IntXString instance KeyHasValue MyKeyVal Float Int where constructor = FloatXInt I have an instance instance (..., KeyHasValue a k v) => Datasource [a] k v where ... This way, I can read Ints from a [MyKeyVal], and get a String, and read Floats, and get an Int. If I would have a fundep class Datasource s k v | s -> k v where ... this wouldn't be possible anymore, I guess? Regards, Robert

2 1

[Fwd: Oops [Fwd: Re: Allowing duplicate instances in GHC 6.4]]
by Robert van Herk 31 Mar '05

31 Mar '05

Sorry, oops again: The problem is that it complains that it cannot find an instance for Datasource' z [MyKeyVal] [MyKeyVal] Float Int Whilst I have an instance Datasource [MyKeyVal] Float Int Thus, it seems that it needs an explicit type for the z here. Both datasources stored in the joined datasource are of type [MyKeyVal], so I would expect this to compile correctly, and then take the left datasource. Sorry that my explanation is all so confusing.... Robert

1 0

Allowing duplicate instances in GHC 6.4
by Robert van Herk 31 Mar '05

31 Mar '05

Hi all, I need to use duplicate instances. I read in the documentation on GHC 6.4, that overlapping class instances checks are lazy instead of gready in 6.4. However, my code still gives duplicate instance errors when compiling in GHC 6.4. Is the duplicate instance check still gready? Is there a way to overwrite that behaviour? Right now, I have two instance of a class Datasource. Datasource allows the user to read (key,value) pairs. class Datasource ds k v where ... Now, I wanted to make a special datasource that combines two datasources, namely data JoinedDS left right = JoinedDS left right instance (Datasource left k v) => Datasource (JoinedDS left right) k v where ... instance (Datasource right k v) => Datasource (JoinedDS left right) k v where ... The idea is that when you combine 2 datasources in one JoinedDS, the user can read both types from the JoinedDS. I do not need to allow to combine 2 different datasources that have the same types of (key,value) pairs, so the duplicate instances will not occur and when they do, this will be by mistake. Hence, the two premisses in the instance declaration will never be fulfilled both at the same time and I do not want a duplicate instance error here. Is there a solution to this problem? Thanks, Robert

2 8

Size of UArrays
by Andreas Marth 30 Mar '05

30 Mar '05

Hallo! I would like to know how big an "UArray (100,100) Double" is (approximately) in Bytes. And how much heap will the program consume for it. (I mean does the garbage collector need this size, or double the size, or what?) Thanks, Andreas

2 1