GitLab

--------------------------------------
	Make Template Haskell into the HEAD
	--------------------------------------

This massive commit transfers to the HEAD all the stuff that
Simon and Tim have been doing on Template Haskell.  The
meta-haskell-branch is no more!

WARNING: make sure that you

  * Update your links if you are using link trees.
    Some modules have been added, some have gone away.

  * Do 'make clean' in all library trees.
    The interface file format has changed, and you can
    get strange panics (sadly) if GHC tries to read old interface files:
    e.g.  ghc-5.05: panic! (the `impossible' happened, GHC version 5.05):
	  Binary.get(TyClDecl): ForeignType

  * You need to recompile the rts too; Linker.c has changed


However the libraries are almost unaltered; just a tiny change in
Base, and to the exports in Prelude.


NOTE: so far as TH itself is concerned, expression splices work
fine, but declaration splices are not complete.


		---------------
		The main change
		---------------

The main structural change: renaming and typechecking have to be
interleaved, because we can't rename stuff after a declaration splice
until after we've typechecked the stuff before (and the splice
itself).

* Combine the renamer and typecheker monads into one
	(TcRnMonad, TcRnTypes)
  These two replace TcMonad and RnMonad

* Give them a single 'driver' (TcRnDriver).  This driver
  replaces TcModule.lhs and Rename.lhs

* The haskell-src library package has a module
	Language/Haskell/THSyntax
  which defines the Haskell data type seen by the TH programmer.

* New modules:
	hsSyn/Convert.hs 	converts THSyntax -> HsSyn
	deSugar/DsMeta.hs 	converts HsSyn -> THSyntax

* New module typecheck/TcSplice type-checks Template Haskell splices.

		-------------
		Linking stuff
		-------------

* ByteCodeLink has been split into
	ByteCodeLink	(which links)
	ByteCodeAsm	(which assembles)

* New module ghci/ObjLink is the object-code linker.

* compMan/CmLink is removed entirely (was out of place)
  Ditto CmTypes (which was tiny)

* Linker.c initialises the linker when it is first used (no need to call
  initLinker any more).  Template Haskell makes it harder to know when
  and whether to initialise the linker.


	-------------------------------------
	Gathering the LIE in the type checker
	-------------------------------------

* Instead of explicitly gathering constraints in the LIE
	tcExpr :: RenamedExpr -> TcM (TypecheckedExpr, LIE)
  we now dump the constraints into a mutable varabiable carried
  by the monad, so we get
	tcExpr :: RenamedExpr -> TcM TypecheckedExpr

  Much less clutter in the code, and more efficient too.
  (Originally suggested by Mark Shields.)


		-----------------
		Remove "SysNames"
		-----------------

Because the renamer and the type checker were entirely separate,
we had to carry some rather tiresome implicit binders (or "SysNames")
along inside some of the HsDecl data structures.  They were both
tiresome and fragile.

Now that the typechecker and renamer are more intimately coupled,
we can eliminate SysNames (well, mostly... default methods still
carry something similar).

		-------------
		Clean up HsPat
		-------------

One big clean up is this: instead of having two HsPat types (InPat and
OutPat), they are now combined into one.  This is more consistent with
the way that HsExpr etc is handled; there are some 'Out' constructors
for the type checker output.

So:
	HsPat.InPat	--> HsPat.Pat
	HsPat.OutPat	--> HsPat.Pat
	No 'pat' type parameter in HsExpr, HsBinds, etc

	Constructor patterns are nicer now: they use
		HsPat.HsConDetails
	for the three cases of constructor patterns:
		prefix, infix, and record-bindings

	The *same* data type HsConDetails is used in the type
	declaration of the data type (HsDecls.TyData)

Lots of associated clean-up operations here and there.  Less code.
Everything is wonderful.

Make ghc-pkg independent of hslibs

Correct comments

Yet another correction to earlier commit..
*now* those rank-2 pattern matches should work

		MERGE TO STABLE

Remove bogus warning

Tidy up error message for "funny global things"

Put debugging output in #ifdef DEBUG

MERGE TO STABLE

Remove redundant debug printing

Fix a(nother) bug in the new THUNK_SELECTOR code.  Hopefully should
fix the crashes seen in the last few nightly builds.

Add notes on how to build a .a file to the docs, as requested by Koen
Claessen.

Sigh! forgot one case!  MERGE TO STABLE

Cosmetics only

Correction to earlier commit.. *now* those rank-2 pattern matches should work

		MERGE TO STABLE

The body of a for-all should be of kind *

		MERGE TO STABLE

--------------------------------
	Fix rank-2 pattern-match failure
	--------------------------------

This fixes the failure when you have a rank-2 type sig
matching a data type pattern.  Thus

	data T a = T1 | T2 a

	f :: (forall x. T x) -> Int
	f T1 = ...

This crashes GHC 5.04

--------------------------------------
	Attach inline pragmas to class methods
	--------------------------------------

This fix makes INLINE pragmas on method bindings (in class
or instance decls) work properly.

It seems to have been hanging around in my tree for some time.
To be on the safe side, let's not merge this into 5.04.1, although
it should be fine (an an improvement).

Formatting only

Formatting only

Make sure we get the compiler's own Pretty library when we #include
../utils/ghc-pkg/Package.hs.

Urk, the 'import Pretty' in this module was a bit of a hack; when
compiled as part of the standalone ghc-pkg tool it referred to the
Pretty library from the util package, but when compiled as part of the
compiler it referred to the compiler's own Pretty module.  Hack around
this.

Build without hslibs on GHC >= 5.04

Build without hslibs on GHC >= 5.04

Build without hslibs on GHC >= 5.04

Tentative fix for the recent blkcnt_t trouble

Nuke the unsupported hslibs version of HOpenGL on the HEAD, too. Now
we are only left with two versions, which I think is OK: A stable one
(not in the fptools repository, but on my web site) and a cool, but
*very* incomplete one (currently only GLUT) for bleeding edge people
in the hierarchical libraries parts of the repository.

Disallow ForeignObj as well as ForeignPtr FFI arguments

Finally separate the compiler from hslibs.

Mainly import wibbles, and use the new POSIX library when
bootstrapping.

Partial rewrite of the POSIX library.

The main purpose of this sweep is to remove the last dependencies of
the compiler on hslibs.  When I've committed the associated compiler
changes, only the 'base' package will be required to bootstrap the
compiler.  Additionally to build GHCi, the 'readline' and 'unix'
packages will be required.

The new POSIX library lives mostly in libraries/unix, with a few bits
required for compiler bootstrapping in libraries/base.  The 'base'
package is mostly free of hsc2hs code to make bootstrapping from HC
files easier, but the 'unix' package will use hsc2hs liberally.

The old POSIX library continues to provide more-or-less the same
interface as before, although some of the types are more correct now
(previously lots of POSIX types were just mapped to Int).  The new
interface is largely the same as the old, except that some new
functionality from the latest POSIX spec has been added (eg. symbolic
links).

So far, the new POSIX library has signal support, directory/file
operations and lots of stuff from unistd.h.  The module names are:

  System.Posix
	The main dude, exports everything

  System.Posix.Types
	All the POSIX types, using the same naming scheme as
        Foreign.C.Types, Eg. CUid, COff, etc.  Many of these types
        were previously exported by GHC.Posix.

        Additionally exports the "nicer" names used by the old POSIX
	library for compatibility (eg. ProcessID == CPid, FileMode ==
	CMode, etc.)

	All reasonable instances are derived for these types.

  System.Posix.Signals
	Signal support, contains most of which was in PosixProcPrim before.
	The RTS interface to the signal handling support has been
	rationalised slightly.

  System.Posix.Directory
 	Directory support, most were in PosixFiles before.

  System.Posix.Files
	File operations, most were in PosixFiles before.

  System.Posix.Unistd
	(for want of a better name) Miscellaneous bits that mostly come
	from the unistd.h header file.  PosixProcEnv before.

The rest of the library should pan out like so:

  System.Posix.IO
  System.Posix.Error   (maybe)
  System.Posix.Process
  System.Posix.Terminal

(I've no doubt broken Win32 support, but I'm checking the build at the moment).

Remove ForeignObj and ForeignPtr keys

Remove foreignPtrTyCon and foreignObjTyCon

Disallow ForeignPtr as an FFI argument type.

Disallow 'ForeignPtr' as an FFI argument type.  It has been deprecated
for some time (withForeignPtr is the approved way to pass a
ForeignPtr).  The changes I'm about to make to ForeignPtr will stop it
working anyhow.

Selector Thunk Fix, take II.

The previous version didn't deal well with selector thunks which point
to more selector thunks, and on closer inspection the method was
flawed.  Now I've introduced a function

	StgClosure *eval_selector_thunk( int field, StgClosure * )

which evaluates a selector thunk returning its value, in from-space,
if possible.  It blackholes the thunk during evaluation.  It might
recursively evaluate more selector thunks, but it does this in a
bounded way and updates the thunks with indirections (NOT forwarding
pointers) after evaluation.

This cleans things up somewhat, and I believe it deals properly with
both types of selector-thunk loops that arise.

MERGE TO STABLE

perl made uglier to work around the perl 5.7/5.8 bug documented at
http://bugs6.perl.org/rt2/Ticket/Display.html?id=1760 and illustrated
by the seg fault of perl -e '("x\n" x 5000) =~ /(.*\n)+/'

MERGE TO STABLE

Fix for infinite loop when there is a THUNK_SELECTOR which eventually
refers to itself, such as might be generated by code like

	let x = (fst x, snd x) in ...

At the same time, I re-enabled the code to traverse multiple selector
thunks with bounded depth, because I believe it now works.

MERGE TO STABLE (but test thoroughly in the HEAD first, this is
fragile stuff)

In code style, print negative floating point literals in parentheses
to avoid interacting with surrounding syntax.

Fixes SourceForge bug #604849

MERGE TO STABLE

Remove RtsAPIDeprec.c, since this is causing grief.  The upshot (I
think) is that you won't be able to do foreign import "wrapper" with
an Addr in the type.

Disallow 'foreign import stdcall "wrapper"' when compiling via the
NCG.

MERGE TO STABLE

Import fixups

Exception => Control.Exception