Directory wibbles

Fergot the booties...

Basic functional dependency implementation.  Most notable change to be
aware of is that the datatype `Inst' now has a new constructor `FunDep'
used to track functional dependencies.  The FunDep predicates are filtered
out in tcSimplify* so that they don't escape.

Change the convention for cost-centre labels to be <name>_cc and
cost-centre stacks to be <name>_ccs.  This makes cost-centre labels
more consistent with our other naming conventions, and fixes some
problems caused by cost-centre labels being misinterpreted by the
mangler.

This fixes one cause of profiled programs crashing; if you're seeing
this symptom then this patch may help.

"compilation IS required" ===>  ""

Relegate the "ignoring heap-size setting option..." messages to -v.

Relegate the 'Out of date: <blah>' messages to -dshow-rn-trace, they
don't mean a great deal to the average punter.

The infamous "NOTE: simplifier still going..." message is now
protected by #ifdef DEBUG.  It doesn't mean much to the average user,
and we tend to use DEBUG when hacking anyway.

Only print out the module-version info messages when the -v flag is
on.

Something-similar-requested-ages-ago-by: Sven Panne

Fix up code to print out the phase & signal number if one of the
compilation phases receives a signal.  The previous commit
accidentally sneaked in a non-working version of this stuff.

add missing #include

disallow case expressions with no alternatives.

Add some tests for the new async exception behaviour.

initialize the blocked_exceptions field of a TSO properly.

Oops, forgot to scavenge the new fields in a TSO.

Common up no less than 3 copies of the TSO scavenging code in the
process, thus fixing a bug in one of the copies.

Fix the case where we're killing a thread that is blocked on
delivering an exception.

Support for blocking & unblocking asynchronous exceptions.

  - new primops:

	blockAsyncExceptions#, unblockAsyncExceptions# :: IO a -> IO a

  - raiseInThread will block if the target thread is currently
    blocking async exceptions.

  - async exceptions are currently implicitly blocked inside
    an exception handler.  This decision might be reversed when
    we have more experience with this stuff.

  - Move exception-related stuff in the RTS into its own file,
    Exception.{h,hc}.

Remove empty sections for arch's supported in StgCRun.c.

Alpha fixes.

SMP comment

Disable the Mark Jones optimisation for instance decls, since it is
incompatible with Hugs.

Make <readline/history.h> a requirement for use of libreadline.

Add rules so library sources can be obtained from fptools/hslibs.

Fix bug in 'deriving Enum' reported by Ralf Hinze:
   data T = A | B deriving Enum
failed, requiring instance Ord T, because code generated
for enumFromThen required Ord.  We now derive just fromEnum
and toEnum, and let the Report's defaults do the rest.

... and of course these files might come in handy ...

First bits o' functional dependencies - just the syntax and related
datatypes, plus started moving some of the static checks from the
renamer (where we don't know about fundeps) to later in the typechecker.

Eliminate warnings for uninitialised srt fields in constructors.

Eliminate some warnings.

Add hslibs to the default $(ProjectsTo{Install,Build})

Allow a for-all type inside a usage annotation:

	__u - (forall a. type)

[This actually simply inolved making rnHsType a bit more permissive.]

The particular way this shows up right now is a bug that Keith is working
on, but in general it should be legal.

Make StgHugs use the same naming scheme as GHC does for class +
instance machinery.

Add machinery to do Z-encoding/decoding of names extracted from
interface files.

Make the ELF object loader work again.  It seemed to have suffered
slight bitrot over the past couple of months.  Fix various minor bugs.

Track a small change in interface file syntax.

Make Printer.c print tagged-unboxed stack sections in a decent way
now that Alastair-style stack tags have been abandoned.

Implement foreign import dynamic.

Make it so that a class decl generates default method decls
for every method, not just for the ones that the user supplies
default-methods for.

GHC will never call these default-default methods, because
when it finds an instance decl with no defn for a method,
*and* the class decl doesn't have a user-programmed default
method, it whips up a new default method for that instance
decl so that the error message is more informative than
the default-default method would be.

But Hugs isn't so smart, and wants to call something from
the class decl.

This change required fiddling with more than I expected.  Sigh.

Simon

error.h -> stgerror.h

error.h --> stgerror.h

This commit adds the new RTS option `-xc', which prints the current
cost-centre stack to stderr whenever an exception is raised.  This is
intended to be a debugging tool, to help trace those "Prelude.head:
empty list" errors that are so frustrating to find.

`-xc' is only available for programs compiled with -prof, and you
probably want -auto as well to get useful information.

This is currently experimental; it would be better if it only
displayed the info for *uncaught* exceptions, but this is harder to
implement.

This commit also makes an OFTEL-inspired extension to the RTS option
space.  Since we've almost run out of options, `-x' is now reserved
for `extended' options.  `-xc' is the first of these, but that leaves
'-x[0-9A-Zabd-wyz]' still to be used!  The prefix `-xx' is reserved
for future extension.

GHC bits for new library organisation.

rename error.h to stgerror.h

Rename error.h to stgerror.h

slight cleanup