[project @ 1999-12-20 10:34:27 by simonpj]
This commit implements a substantial re-organisation of the Prelude
It also fixes a couple of small renamer bugs that were reported recently
(notably, Sven pointed out that we weren't reporting
unused imports properly)
My original goal was to get rid of all "orphan" modules (i.e. ones
with instance decls that don't belong either to a tycon or a class
defined in the same module). This should reduce the number of
interface files that have to be read when compiling small Haskell
modules.
But like most expeditions into the Prelude Swamp, it spiraled out
of control. The result is quite satisfactory, though.
GONE AWAY: PrelCCall, PrelNumExtra
NEW: PrelReal, PrelFloat, PrelByteArr, PrelNum.hi-boot
(The extra PrelNum.hi-boot is because of a tiresome thin-air Id, addr2Integer,
which used to be in PrelBase.)
Quite a lot of types have moved from one module to another,
which entails some changes to part of the compiler (PrelInfo, PrelMods) etc,
and there are a few places in the RTS includes and even in the driver
that know about these home modules (alas).
So the rough structure is as follows, in (linearised) dependency order
[this list now appears in PrelBase.lhs]
PrelGHC Has no implementation. It defines built-in things, and
by importing it you bring them into scope.
The source file is PrelGHC.hi-boot, which is just
copied to make PrelGHC.hi
Classes: CCallable, CReturnable
PrelBase Classes: Eq, Ord, Functor, Monad
Types: list, (), Int, Bool, Ordering, Char, String
PrelTup Types: tuples, plus instances for PrelBase classes
PrelShow Class: Show, plus instances for PrelBase/PrelTup types
PrelEnum Class: Enum, plus instances for PrelBase/PrelTup types
PrelMaybe Type: Maybe, plus instances for PrelBase classes
PrelNum Class: Num, plus instances for Int
Type: Integer, plus instances for all classes so far (Eq, Ord, Num, Show)
Integer is needed here because it is mentioned in the signature
of 'fromInteger' in class Num
PrelReal Classes: Real, Integral, Fractional, RealFrac
plus instances for Int, Integer
Types: Ratio, Rational
plus intances for classes so far
Rational is needed here because it is mentioned in the signature
of 'toRational' in class Real
Ix Classes: Ix, plus instances for Int, Bool, Char, Integer, Ordering, tuples
PrelArr Types: Array, MutableArray, MutableVar
Does *not* contain any ByteArray stuff (see PrelByteArr)
Arrays are used by a function in PrelFloat
PrelFloat Classes: Floating, RealFloat
Types: Float, Double, plus instances of all classes so far
This module contains everything to do with floating point.
It is a big module (900 lines)
With a bit of luck, many modules can be compiled without ever reading PrelFloat.hi
PrelByteArr Types: ByteArray, MutableByteArray
We want this one to be after PrelFloat, because it defines arrays
of unboxed floats.
Other Prelude modules are much easier with fewer complex dependencies.
50 files changed: