[project @ 1998-12-02 13:17:09 by simonm]

Move 4.01 onto the main trunk.

acconfig.h

@@ -33,47 +33,24 @@
 /* Define as the symbol which marks the end of the data section */
 #undef DATA_SECTION_END_MARKER
 
-/* Define as the decl which terminates the data section */
-#undef DATA_SECTION_END_MARKER_DECL
-
 /* Define if time.h or sys/time.h define the altzone variable */
 #undef HAVE_ALTZONE
 
-/* Define if you have /bin/sh */
-#define HAVE_BIN_SH 0
-
-/* Define if you have the GetModuleFileName function.  */
-#define HAVE_GETMODULEFILENAME 0
-
 /* Define if C compiler supports long long types */
 #undef HAVE_LONG_LONG
 
 /* Define if fcntl.h defines O_BINARY */
 #undef HAVE_O_BINARY
 
-/* Define if compiler supports prototypes. */
-#define HAVE_PROTOTYPES 0
-
-/* Define if you have the WinExec function.  */
-#define HAVE_WINEXEC 0
-
 /* Define if C Symbols have a leading underscore added by the compiler */
 #undef LEADING_UNDERSCORE
 
 /* Define as the symbol which marks the end of the text section */
 #undef TEXT_SECTION_END_MARKER
 
-/* Define to decl that terminates text section. */
-#undef TEXT_SECTION_END_MARKER_DECL
-
 /* Define to the type of the timezone variable (usually long or time_t) */
 #undef TYPE_TIMEZONE
 
-/* Define if signal handlers have type void (*)(int)
- * (Otherwise, they're assumed to have type int (*)(void).)
- */
-#define VOID_INT_SIGNALS 0
- 
 
 /* Leave that blank line there!!  Autoheader needs it.
    If you're adding to this file, keep in mind:

aclocal.m4

-dnl $Id: aclocal.m4,v 1.34 1998/11/24 21:28:00 reid Exp $
+dnl $Id: aclocal.m4,v 1.35 1998/12/02 13:17:10 simonm Exp $
 dnl 
 dnl Extra autoconf macros for the Glasgow fptools
 dnl
@@ -470,7 +470,7 @@ for i in etext _etext __etext; do
   fi
 done
 if test "$not_done" = 1; then
-FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_cv_end_of_text)
+FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_cv_end_of_text);
 if test "$fptools_cv_end_of_text" = yes; then
   AC_DEFINE(TEXT_SECTION_END_MARKER_DECL, etext asm("etext"))
   AC_DEFINE(TEXT_SECTION_END_MARKER, etext)
@@ -496,7 +496,7 @@ for i in end _end __end; do
   fi
 done
 if test "$not_done" = 1; then
-FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_cv_end_of_data)
+FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_cv_end_of_data);
 if test "$fptools_cv_end_of_data" = yes; then
   AC_DEFINE(DATA_SECTION_END_MARKER_DECL, end asm("end"))
   AC_DEFINE(DATA_SECTION_END_MARKER, end)

configure.in

@@ -436,7 +436,7 @@ dnl ** check for full ANSI header (.h) files
 AC_HEADER_STDC
 
 dnl ** check for specific header (.h) files that we are interested in
-AC_CHECK_HEADERS(Files.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdlib.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h readline/readline.h bfd.h)
+AC_CHECK_HEADERS(Files.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdlib.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/limits.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h readline/readline.h bfd.h)
 
 dnl ** check for DOS include files
 AC_CHECK_HEADERS(dos.h conio.h io.h std.h) 

ghc/ANNOUNCE

-	     The Glasgow Haskell Compiler -- version 3.02
+	     The Glasgow Haskell Compiler -- version 4.01
 	    ==============================================
 
 We are pleased to announce a new release of the Glasgow Haskell
-Compiler (GHC), version 3.02.  The source distribution is freely
+Compiler (GHC), version 4.01.  The source distribution is freely
 available via the World-Wide Web and through anon. FTP; details below.
 
 Haskell is "the" standard lazy functional programming language; the
@@ -14,15 +14,19 @@ related information is available from the Haskell home page at
 + What's new
 =============
 
-GHC 3.02 is a source-only release.  Major news items:
+GHC 4.01 is a small increment over 4.00.  Many bugs have been fixed.
+The following features are new:
 
-	* A new specialiser,
-	* A new unsafeCoerce# primitive.
-	* A NOINLINE pragma.
-	* Many bugs fixed, including several performance-related ones,
+	* Weak pointers,
+	* The foreign function interface is now complete.
 
-GHC 3.02 produces the fastest code since 0.29, but there's still
-plenty of tuning to do.
+In addition, bootstrapping the compiler should now work out of the box.
+
+The following things have not been fixed yet:
+
+	* The native code generator is still flaky, and is turned off by
+	  default for the time being.
+	* The profiler is still flaky.
 
 + Mailing lists
 ================
@@ -64,21 +68,22 @@ for tar, please)!
 + System requirements
 ======================
 
-To compile up this source-only release, you need a machine with 16+MB
+To compile up this source-only release, you need a machine with 32+MB
 memory, GNU C (`gcc'), `perl' plus a version of GHC installed (version
-2.10 at least). We have seen GHC work on these platforms:
+2.10 at least).  This release is known to work on the following platforms:
+
+  * i386-unknown-{linux,solaris2,freebsd,cygwin32}
+  * sparc-sun-{sunos4,solaris2}
+
+Ports to the following platforms should be relatively easy, but
+haven't been tested due to lack of time/hardware:
 
   * alpha-dec-osf{2,3}
   * hppa1.1-hp-hpux{9,10}
-  * sparc-sun-{sunos4,solaris2}
   * mips-sgi-irix{5,6}
-  * i386-unknown-{linux,solaris2,freebsd,cygwin32}.
   * {rs6000,powerpc}-ibm-aix
 
-Similar platforms should work with minimal hacking effort.  The installer's
-guide included in distribution gives a complete run-down of what-ports-work;
-an on-line version can be found at
-
-   http://www.dcs.gla.ac.uk/fp/software/ghc/3.02/installation_guide/installing_toc.html
+The installer's guide included in distribution gives a complete
+run-down of what-ports-work; an on-line version can be found at
 
-EOF
+   http://www.dcs.gla.ac.uk/fp/software/ghc/4.01/installation_guide/installing_toc.html

ghc/Makefile

 #-----------------------------------------------------------------------------
-# $Id: Makefile,v 1.7 1997/03/24 08:39:19 sof Exp $
+# $Id: Makefile,v 1.8 1998/12/02 13:17:13 simonm Exp $
 #
 
 TOP=.
@@ -21,9 +21,9 @@ include $(TOP)/mk/boilerplate.mk
 # we descend into compiler/ and lib/
 #
 ifeq "$(GhcWithHscBuiltViaC)" "NO"
-SUBDIRS = utils driver includes runtime docs compiler lib
+SUBDIRS = utils driver includes rts docs compiler lib
 else
-SUBDIRS = utils driver includes runtime docs lib compiler
+SUBDIRS = utils driver includes rts docs lib compiler
 endif
 
 # Easier to copy

ghc/PATCHLEVEL

-The Glamorous Glasgow Haskell Compiler, version 3.02, patchlevel 0
+The Glamorous Glasgow Haskell Compiler, version 4.01, patchlevel 0

ghc/README

-This is version 3.02 of the Glorious Glasgow Haskell compilation
-system (GHC).  GHC 3.02 is a compiler for Haskell 1.4.
+This is version 4.01 of the Glorious Glasgow Haskell compilation
+system (GHC).  GHC 4.01 is a compiler for Haskell 1.4.
 
 Haskell is "the" standard lazy functional programming language.
 Haskell 1.4 is the current version of the language, released in 
 April 1997.  The language definition is on the Web at
 http://www.haskell.org/report/index.html.
 
+More information on GHC can be found on its web page
+
+	http://www.dcs.gla.ac.uk/fp/software/ghc
+
 GHC documentation of interest:
 
-* docs/installing.{dvi,info,html}: How to configure, build, and
+* docs/installing.{dvi,html}: How to configure, build, and
   install the system.
 
   The document, as with many others, is in TeX-produced DVI format
-  (.dvi suffix), or GNU Info format (.info); the latter is close to
-  plain ASCII, if that's what you want.
+  (.dvi suffix), or HTML.
 
-* ghc/docs/users_guide/user.{dvi,info,html}: How to use GHC; e.g., what
+* ghc/docs/users_guide/user.{dvi,html}: How to use GHC; e.g., what
   options are available, how to cope with common problems, how to use
   the profiling facilities, etc.
 
+* ghc/docs/libraries/libs.{dvi,html}: Several libraries that are
+  provided by both GHC and Hugs.
+
 We welcome your comments and suggestions about this software!  Please
 do not suffer or grumble in silence.  The "bug reports" section of the
-User's Guide (docs/users_guide/user.{dvi,info,html}) says what we
-would like to know when you report a problem.
+User's Guide says what we would like to know when you report a
+problem.
 
-Current AQUA team (all @dcs.gla.ac.uk):
+Current GHC team:
+
+    Simon Peyton Jones	( simonpj@microsoft.com)    [our Fearless Leader]
+    Sigbjorn Finne	(v-sfinne@microsoft.com)    [hired hand]
+    Simon Marlow	(t-simonm@microsoft.com)    [hired hand]
+
+Past contributors and/or continuing advisors (all @dcs.gla.ac.uk):
 
-    Sigbjorn Finne	(sof)	    [hired hand]
-    Hans Wolfgang Loidl (hwloidl)   [PhD student]
-    Simon Marlow	(simonm)    [hired hand]
     Thomas Nordin       (nordin)    [@cse.ogi.edu; Green Card Hero]
-    Simon Peyton Jones	(simonpj)   [our Fearless Leader]
+    Hans Wolfgang Loidl (hwloidl)   [PhD student]
     Patrick Sansom	(sansom)    [hired hand, Bidirectional Analyses]
     Phil Trinder	(trinder)   [hired hand, Parade]
-
-Past contributors and/or continuing advisors:
-
     Andy Gill		(andy)	    [PhD student; at HP]
     Cordy Hall		(cvh) 	    [GRASP]
     Kevin Hammond	(kh)	    [GRASP; at St. Andrews]
@@ -49,6 +55,8 @@ Past contributors and/or continuing advisors:
     David N Turner	(dnt)	    [Linear Types; at An-Teallach]
     Phil Wadler		(wadler)    [GRASP; at Lucent]
 
+And many others who've contributed bits of code / bug reports in the past.
+
 Cool people who've let us use their machines:
 
     sparc-sun-sunos{4,5}   PacSoft, Oregon Graduate Institute
@@ -65,14 +73,13 @@ Simon's projects' acronyms:
     GRASP ('90-'92): Graph reduction applications support project
     AQUA  ('93-   ): Declarative systems architecture: a quantitative approach
 
-GHC WWW page: http://www.dcs.gla.ac.uk/fp/software/ghc/
-
 E-mail contacts:
     glasgow-haskell-bugs@dcs.gla.ac.uk	    (bug reports mailing list)
     glasgow-haskell-users@dcs.gla.ac.uk	    (users' mailing list)
 
 Send mail to majordomo@dcs.gla.ac.uk with 'help' in the body of the
-message for information on joining either of these mailing lists.
+message for information on joining/leaving either of these mailing
+lists.
 
 Anonymous FTP site: ftp://ftp.dcs.gla.ac.uk:pub/haskell/glasgow.
 Mostly mirrored by ftp.cs.chalmers.se and haskell.org (same

ghc/compiler/DEPEND-NOTES

+ToDo
+~~~~
+* Test effect of eta-expanding past (case x of ..)
+
+* Bottom strictness isn't right.  Should be (eg) SSX, not just X.
+
+* Enumeration types in worker/wrapper for strictness analysis
+
+* Use (!) types in data cons to unbox.
+
+* Check constant folding
+
+* .hi file isn't updated if the only change is to the exports.
+  For example, UgenAll.lhs re-exports all of U_binding.hs; when a data type
+  decl in the latter changes, the .hi file for the former isn't updated.
+  I think this happens when a module exports another mdodule thus:
+
+	module UgenAll( module U_binding, ... ) where
+
+* This should be reported as an error:
+	data T k = MkT (k Int#)
+
+* Bogus report of overlapped pattern for
+	f (R {field = [c]}) = 1
+  	f (R {})	      = 2
+  This shows up for TyCon.maybeTyConSingleCon
+
+*  > module Main( main ) where
+
+   > f :: String -> Int
+   > f "=<" = 0
+   > f "="  = 0
+   
+   > g :: [Char] -> Int
+   > g ['=','<'] = 0
+   > g ['=']     = 0
+   
+   > main = return ()
+   
+   For ``f'' the following is reported.
+   
+   tmp.lhs:4: 
+    Pattern match(es) are overlapped in the definition of function `f'
+            "=" = ...
+
+   There are no complaints for definition for ``g''.
+
+* Without -O I don't think we need change the module version
+  if the usages change; I forget why it changes even with -O
+
+* Record selectors for existential type; no good!  What to do?
+  Record update doesn't make sense either.
+
+  Need to be careful when figuring out strictness, and when generating
+  worker-wrapper split.
+
+  Also when deriving.
+
+* Consructor re-use via CSE
+
+		Notes on module dependencies
+		~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The Name/Var/Type group is a bit complicated. Here's the deal
+
+	Name, PrimRep, FieldLabel (uses Type.Type)
+then
+	Var (uses Const.Con, IdInfo.IdInfo, Type.GenType, Type.Kind)
+then
+	VarEnv, VarSet
+then
+	Class (uses TyCon.TyCon, Type.Type, SpecEnv.SpecEnv)
+then
+	TyCon (uses Type.Type, Type.Kind, DataCon.DataCon)
+then
+	Type (uses [DataCon.DataCon])
+then
+	DataCon, TysPrim, Unify, SpecEnv, PprType
+then
+	IdInfo, TysWiredIn (uses DataCon.mkDataCon, [MkId.mkDataConId])
+then
+	PrimOp (uses PprType, TysWiredIn)
+then
+	Const (needs PrimOp, [TysWiredIn.stringTy])
+then
+	Id (needs Const.Con(..)), CoreSyn
+then
+	CoreUtils, OccurAnal
+then
+	CoreUnfold (uses OccurAnal)
+then
+	MkId (uses CoreUnfold)
+	
+
+PrimOp uses TysWiredIn
+
+
+Add
+~~~
+basicTypes/DataCon.lhs
+basicTypes/DataCon.hi-boot
+
+Remove
+~~~~~~
+specialise/SpecUtils.lhs
+basicTypes/IdUtils.lhs

ghc/compiler/Makefile

 # -----------------------------------------------------------------------------
-# $Id: Makefile,v 1.45 1998/08/21 11:03:30 sof Exp $
+# $Id: Makefile,v 1.46 1998/12/02 13:17:15 simonm Exp $
 
 TOP = ..
 include $(TOP)/mk/boilerplate.mk
@@ -60,14 +60,21 @@ endif
 
 
 HS_SRCS = $(SRCS_UGNHS) \
-          $(foreach dir,$(DIRS),$(wildcard $(dir)/*.lhs)) \
-	  rename/ParseIface.hs
+          $(foreach dir,$(DIRS),$(wildcard $(dir)/*.lhs))
+
+ifneq "$(GhcWithHscBuiltViaC)" "YES"
+HS_SRCS += rename/ParseIface.hs
+endif
 
 # NB: it's no good to include *.hs in the top-line wildcard, because the .hs files
 #     in parser/ may not have been created at that point.
 
 HCS      = $(patsubst %.lhs, %.hc, $(patsubst %.hs, %.hc, $(HS_SRCS)))
 
+# ParseIface.hs ain't part of HS_SRCS when this is on..
+ifeq "$(GhcWithHscBuiltViaC)" "YES"
+HCS      += rename/ParseIface.hc
+endif
 
 HS_OBJS  = \
   $(patsubst %.hc, %.o, $(HCS)) \
@@ -91,15 +98,14 @@ C_SRCS += $(SRCS_UGNC)
 LIBOBJS = \
   $(SRCS_UGN_OBJS) parser/hslexer.o parser/hsparser.tab.o \
   parser/id.o parser/infix.o parser/syntax.o parser/type2context.o \
-  parser/util.o
+  parser/util.o parser/ctypes.o
 
-#
 # stuff you get for free in a source distribution
 # 
-SRC_DIST_FILES += rename/ParseIface.hs \
- parser/U_tree.c parser/tree.h parser/tree.c \
- parser/hsparser.tab.c parser/hsparser.tab.h \
- parser/hslexer.c
+# SRC_DIST_FILES += rename/ParseIface.hs \
+#  parser/U_tree.c parser/tree.h parser/tree.c \
+#  parser/hsparser.tab.c parser/hsparser.tab.h \
+#  parser/hslexer.c
 
 # -----------------------------------------------------------------------------
 # 		Haskell compilations
@@ -138,9 +144,13 @@ absCSyn/PprAbsC_HC_OPTS 	= -H10m
 basicTypes/IdInfo_HC_OPTS 	= -K2m
 hsSyn/HsExpr_HC_OPTS 		= -K2m
 main/Main_HC_OPTS 		= -fvia-C
+main/Constants_HC_OPTS		= -DHscIfaceFileVersion=$(HscIfaceFileVersion)
+
+ifneq "$(GhcWithHscBuiltViaC)" "YES"
 ifeq "$(GhcReportCompiles)" "YES"
 main/Main_HC_OPTS 		+= -syslib misc -DREPORT_TO_MOTHERLODE
 endif
+endif
 
 main/CmdLineOpts_HC_OPTS 	= -fvia-C
 nativeGen/PprMach_HC_OPTS 	= -K2m
@@ -179,13 +189,19 @@ rename/RnExpr_HC_OPTS		= -H10m
 rename/RnNames_HC_OPTS		= -H12m
 rename/RnMonad_HC_OPTS		= -fvia-C
 specialise/Specialise_HC_OPTS 	= -Onot -H12m
+simplCore/Simplify_HC_OPTS	= -H15m	
 typecheck/TcGenDeriv_HC_OPTS	= -H10m
 
+# tmp, -- SDM
+specialise/Specialise_HC_OPTS 	+= -fno-prune-tydecls
+
 # Was 10m for 2.10
 typecheck/TcHsSyn_HC_OPTS	= -H15m	
 
+
 # Was 10m for 2.10
 typecheck/TcExpr_HC_OPTS	= -H15m
+typecheck/TcBinds_HC_OPTS       = -H10m
 
 typecheck/TcEnv_HC_OPTS		= -H10m
 utils/Argv_HC_OPTS 		= -fvia-C
@@ -240,7 +256,7 @@ SRC_FLEX_OPTS += -s
 
 parser/hschooks.o : parser/hschooks.c
 	@$(RM) $@
-	$(HC) -c -o $@ $(HC_OPTS) parser/hschooks.c
+	$(HC) -c -o $@ -I$(GHC_INCLUDE_DIR) $(HC_OPTS) parser/hschooks.c
 
 
 # Interface-file parser uses Happy
@@ -266,9 +282,12 @@ CLEAN_FILES += hsp
 # 		Linking
 
 SRC_LD_OPTS += -no-link-chk
+
+ifneq "$(GhcWithHscBuiltViaC)" "YES"
 ifeq "$(GhcReportCompiles)" "YES"
 SRC_LD_OPTS += -syslib misc -syslib exts
 endif
+endif
 
 #-----------------------------------------------------------------------------
 # 		install
@@ -285,7 +304,11 @@ INSTALL_LIBEXECS += hsc hsp
 #
 # Before doing `make depend', need to build all derived Haskell source files
 #
-depend :: $(LOOPS) $(SRCS_UGNHS) rename/ParseIface.hs
+depend :: $(LOOPS) $(SRCS_UGNHS)
+
+ifneq "$(GhcWithHscBuiltViaC)" "YES"
+depend :: rename/ParseIface.hs
+endif
 
 #-----------------------------------------------------------------------------
 # 		clean

ghc/compiler/absCSyn/AbsCSyn.lhs

 %
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
+%
+% $Id: AbsCSyn.lhs,v 1.18 1998/12/02 13:17:16 simonm Exp $
 %
 \section[AbstractC]{Abstract C: the last stop before machine code}
 
@@ -29,32 +31,28 @@ module AbsCSyn {- (
 
 	-- registers
 	MagicId(..), node, infoptr,
-	isVolatileReg, noLiveRegsMask, mkLiveRegsMask,
+	isVolatileReg,
 	CostRes(Cost)
     )-} where
 
 #include "HsVersions.h"
 
 import {-# SOURCE #-} ClosureInfo ( ClosureInfo )
-import {-# SOURCE #-} CLabel	  ( CLabel )
 
 #if  ! OMIT_NATIVE_CODEGEN
 import {-# SOURCE #-} MachMisc
 #endif
 
+import CLabel
 import Constants   	( mAX_Vanilla_REG, mAX_Float_REG,
-			  mAX_Double_REG, lIVENESS_R1, lIVENESS_R2,
-			  lIVENESS_R3, lIVENESS_R4, lIVENESS_R5,
-			  lIVENESS_R6, lIVENESS_R7, lIVENESS_R8
-			)
-import HeapOffs		( VirtualSpAOffset, VirtualSpBOffset,
-			  VirtualHeapOffset, HeapOffset
-			)
-import CostCentre       ( CostCentre )
-import Literal		( mkMachInt, Literal )
-import PrimRep		( isFollowableRep, PrimRep(..) )
+			  mAX_Double_REG, spRelToInt )
+import CostCentre       ( CostCentre, CostCentreStack )
+import Const		( mkMachInt, Literal )
+import PrimRep		( PrimRep(..) )
 import PrimOp           ( PrimOp )
 import Unique           ( Unique )
+import StgSyn		( SRT(..) )
+import BitSet				-- for liveness masks
 
 \end{code}
 
@@ -108,7 +106,6 @@ stored in a mixed type location.)
 				--  CSwitch m [(tag,code)] AbsCNop == code
 
   | CCodeBlock CLabel AbstractC
-			-- [amode analog: CLabelledCode]
 			-- A labelled block of code; this "statement" is not
 			-- executed; rather, the labelled code will be hoisted
 			-- out to the top level (out of line) & it can be
@@ -119,13 +116,11 @@ stored in a mixed type location.)
 	RegRelative	-- address of the info ptr
 	CAddrMode	-- cost centre to place in closure
 			--   CReg CurCostCentre or CC_HDR(R1.p{-Node-})
-	Bool		-- inplace update or allocate
 
   | COpStmt
 	[CAddrMode]	-- Results
 	PrimOp
 	[CAddrMode]	-- Arguments
-	Int		-- Live registers (may be obtainable from volatility? ADR)
 	[MagicId]	-- Potentially volatile/live registers
 			-- (to save/restore around the call/op)
 
@@ -145,6 +140,17 @@ stored in a mixed type location.)
 			-- For example { a := b, b := a }
 			-- 	needs to go via (at least one) temporary
 
+  | CCheck 		-- heap or stack checks, or both.  
+	CCheckMacro 	-- These might include some code to fill in tags 
+	[CAddrMode]	-- on the stack, so we can't use CMacroStmt below.
+	AbstractC
+
+  | CRetDirect			-- Direct return
+        Unique			-- for making labels
+	AbstractC   		-- return code
+	(CLabel,SRT)		-- SRT info
+	Liveness		-- stack liveness at the return point
+
   -- see the notes about these next few; they follow below...
   | CMacroStmt		CStmtMacro	[CAddrMode]
   | CCallProfCtrMacro	FAST_STRING	[CAddrMode]
@@ -166,50 +172,42 @@ stored in a mixed type location.)
   | CStaticClosure
 	CLabel	-- The (full, not base) label to use for labelling the closure.
 	ClosureInfo
-	CAddrMode	-- cost centre identifier to place in closure
-	[CAddrMode]	-- free vars; ptrs, then non-ptrs
+	CAddrMode		-- cost centre identifier to place in closure
+	[CAddrMode]		-- free vars; ptrs, then non-ptrs.
 
+  | CSRT CLabel [CLabel]  	-- SRT declarations: basically an array of 
+				-- pointers to static closures.
+  
+  | CBitmap CLabel LivenessMask	-- A larger-than-32-bits bitmap.
 
   | CClosureInfoAndCode
-	ClosureInfo	-- Explains placement and layout of closure
-	AbstractC	-- Slow entry point code
+	ClosureInfo		-- Explains placement and layout of closure
+	AbstractC		-- Slow entry point code
 	(Maybe AbstractC)
-			-- Fast entry point code, if any
-	CAddrMode	-- Address of update code; Nothing => should never be used
-			-- (which is the case for all except constructors)
-	String		-- Closure description; NB we can't get this from