Cookbook/Compilers and interpreters: Difference between revisions

Revision as of 08:51, 31 August 2009

GHC

Problem	Solution	Examples
compiling and linking an executable	--make	ghc -- make Main.hs --> Main
compiling a file, without linking	-c	ghc -c Foo.hs --> Foo.hi, Foo.o
generating Assembler code	-S	ghc -S Foo.hs --> Foo.hi, Foo.s
generating C code	-C	ghc -C Foo.hs --> Foo.hc, Foo.hi
linking files into an executable	-o	ghc -o test Foo.o Bar.o Baz.p --> test

GHCi

Problem

Solution

Examples

checking a definition

:i

Prelude> :i Monad
class Monad m where
  (>>=) :: m a -> (a -> m b) -> m b
  (>>) :: m a -> m b -> m b
  return :: a -> m a
  fail :: String -> m a
        -- Defined in GHC.Base
instance Monad Maybe -- Defined in Data.Maybe
instance Monad IO -- Defined in GHC.IOBase
instance Monad ((->) r) -- Defined in Control.Monad.Instances
instance Monad [] -- Defined in GHC.Base

checking a type

:t

Prelude> :t "Hello"
"Hello" :: [Char]

Prelude> :t length
length :: [a] -> Int

loading a file

:l

Prelude> :l Foo.hs
[1 of 1] Compiling Foo              ( Foo.hs, interpreted )
Ok, modules loaded: Foo.

Hugs

TODO

@@ Line 20: / Line 20: @@
 |-
 |  generating C code
-|  -S
+|  -C
 |<haskell>ghc -C Foo.hs                    --> Foo.hc, Foo.hi</haskell>
 |-