adamc@1: (* Copyright (c) 2008, Adam Chlipala
adamc@1:  * All rights reserved.
adamc@1:  *
adamc@1:  * Redistribution and use in source and binary forms, with or without
adamc@1:  * modification, are permitted provided that the following conditions are met:
adamc@1:  *
adamc@1:  * - Redistributions of source code must retain the above copyright notice,
adamc@1:  *   this list of conditions and the following disclaimer.
adamc@1:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@1:  *   this list of conditions and the following disclaimer in the documentation
adamc@1:  *   and/or other materials provided with the distribution.
adamc@1:  * - The names of contributors may not be used to endorse or promote products
adamc@1:  *   derived from this software without specific prior written permission.
adamc@1:  *
adamc@1:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@1:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@1:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@1:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@1:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@1:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@1:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@1:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@1:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@1:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@1:  * POSSIBILITY OF SUCH DAMAGE.
adamc@1:  *)
adamc@1: 
adamc@244: (* Ur/Web language parser *)
adamc@1: 
adamc@1: structure Compiler :> COMPILER = struct 
adamc@1: 
adamc@244: structure UrwebLrVals = UrwebLrValsFn(structure Token = LrParser.Token)
adamc@244: structure Lex = UrwebLexFn(structure Tokens = UrwebLrVals.Tokens)
adamc@244: structure UrwebP = Join(structure ParserData = UrwebLrVals.ParserData
adamc@1:                          structure Lex = Lex
adamc@1:                          structure LrParser = LrParser)
adamc@1: 
adamc@270: type job = {
adamc@270:      database : string option,
adamc@274:      sources : string list,
adamc@274:      exe : string,
adamc@274:      sql : string option,
adamc@274:      debug : bool
adamc@270: }
adamc@201: 
adamc@201: type ('src, 'dst) phase = {
adamc@201:      func : 'src -> 'dst,
adamc@201:      print : 'dst -> Print.PD.pp_desc
adamc@201: }
adamc@201: 
adamc@201: type pmap = (string * Time.time) list
adamc@201: 
adamc@201: type ('src, 'dst) transform = {
adamc@201:      func : 'src -> 'dst option,
adamc@201:      print : 'dst -> Print.PD.pp_desc,
adamc@201:      time : 'src * pmap -> 'dst option * pmap
adamc@201: }
adamc@201: 
adamc@201: fun transform (ph : ('src, 'dst) phase) name = {
adamc@201:     func = fn input => let
adamc@201:                   val v = #func ph input
adamc@201:               in
adamc@201:                   if ErrorMsg.anyErrors () then
adamc@201:                       NONE
adamc@201:                   else
adamc@201:                       SOME v
adamc@201:               end,
adamc@201:     print = #print ph,
adamc@201:     time = fn (input, pmap) => let
adamc@201:                   val befor = Time.now ()
adamc@201:                   val v = #func ph input
adamc@201:                   val elapsed = Time.- (Time.now (), befor)
adamc@201:               in
adamc@201:                   (if ErrorMsg.anyErrors () then
adamc@201:                        NONE
adamc@201:                    else
adamc@201:                        SOME v,
adamc@201:                    (name, elapsed) :: pmap)
adamc@201:               end
adamc@201: }
adamc@201: 
adamc@270: fun op o (tr2 : ('b, 'c) transform, tr1 : ('a, 'b) transform) = {
adamc@201:     func = fn input => case #func tr1 input of
adamc@201:                            NONE => NONE
adamc@201:                          | SOME v => #func tr2 v,
adamc@201:     print = #print tr2,
adamc@201:     time = fn (input, pmap) => let
adamc@201:                   val (ro, pmap) = #time tr1 (input, pmap)
adamc@201:               in
adamc@201:                   case ro of
adamc@201:                       NONE => (NONE, pmap)
adamc@201:                     | SOME v => #time tr2 (v, pmap)
adamc@201:               end
adamc@201: }
adamc@201: 
adamc@201: fun run (tr : ('src, 'dst) transform) = #func tr
adamc@201: 
adamc@201: fun runPrint (tr : ('src, 'dst) transform) input =
adamc@201:     case #func tr input of
adamc@201:         NONE => print "Failure\n"
adamc@201:       | SOME v =>
adamc@201:         (print "Success\n";
adamc@201:          Print.print (#print tr v);
adamc@201:          print "\n")
adamc@201: 
adamc@201: fun time (tr : ('src, 'dst) transform) input =
adamc@55:     let
adamc@201:         val (_, pmap) = #time tr (input, [])
adamc@201:     in
adamc@201:         app (fn (name, time) =>
adamc@201:                 print (name ^ ": " ^ LargeReal.toString (Time.toReal time) ^ "\n")) (rev pmap);
adamc@201:         print ("TOTAL: " ^ LargeReal.toString (Time.toReal (foldl Time.+ Time.zeroTime (map #2 pmap))) ^ "\n");
adamc@201:         print "\n"
adamc@201:     end
adamc@55: 
adamc@201: fun timePrint (tr : ('src, 'dst) transform) input =
adamc@201:     let
adamc@201:         val (ro, pmap) = #time tr (input, [])
adamc@55:     in
adamc@201:         app (fn (name, time) =>
adamc@201:                 print (name ^ ": " ^ LargeReal.toString (Time.toReal time) ^ "\n")) (rev pmap);
adamc@201:         print ("TOTAL: " ^ LargeReal.toString (Time.toReal (foldl Time.+ Time.zeroTime (map #2 pmap))) ^ "\n");
adamc@201:         print "\n";
adamc@201:         case ro of
adamc@201:             NONE => print "Failure\n"
adamc@201:           | SOME v =>
adamc@201:             (print "Success\n";
adamc@201:              Print.print (#print tr v);
adamc@201:              print "\n")
adamc@55:     end
adamc@55: 
adamc@244: val parseUrs =
adamc@201:     {func = fn filename => let
adamc@201:                    val fname = OS.FileSys.tmpName ()
adamc@201:                    val outf = TextIO.openOut fname
adamc@201:                    val () = TextIO.output (outf, "sig\n")
adamc@201:                    val inf = TextIO.openIn filename
adamc@201:                    fun loop () =
adamc@201:                        case TextIO.inputLine inf of
adamc@201:                            NONE => ()
adamc@201:                          | SOME line => (TextIO.output (outf, line);
adamc@201:                                          loop ())
adamc@201:                    val () = loop ()
adamc@201:                    val () = TextIO.closeIn inf
adamc@201:                    val () = TextIO.closeOut outf
adamc@201: 
adamc@201:                    val () = (ErrorMsg.resetErrors ();
adamc@201:                              ErrorMsg.resetPositioning filename;
adamc@201:                              Lex.UserDeclarations.initialize ())
adamc@201: 	           val file = TextIO.openIn fname
adamc@201: 	           fun get _ = TextIO.input file
adamc@201: 	           fun parseerror (s, p1, p2) = ErrorMsg.errorAt' (p1, p2) s
adamc@201: 	           val lexer = LrParser.Stream.streamify (Lex.makeLexer get)
adamc@244: 	           val (absyn, _) = UrwebP.parse (30, lexer, parseerror, ())
adamc@201:                in
adamc@201:                    TextIO.closeIn file;
adamc@201:                    case absyn of
adamc@201:                        [(Source.DSgn ("?", (Source.SgnConst sgis, _)), _)] => sgis
adamc@201:                      | _ => (ErrorMsg.errorAt {file = filename,
adamc@201:                                                first = {line = 0,
adamc@201:                                                         char = 0},
adamc@201:                                                last = {line = 0,
adamc@201:                                                        char = 0}} "Not a signature";
adamc@201:                              [])
adamc@201:                end
adamc@201:                handle LrParser.ParseError => [],
adamc@201:      print = Print.p_list_sep Print.PD.newline SourcePrint.p_sgn_item}
adamc@55: 
adamc@1: (* The main parsing routine *)
adamc@244: val parseUr = {
adamc@201:     func = fn filename =>
adamc@201:               let
adamc@201:                   val () = (ErrorMsg.resetErrors ();
adamc@201:                             ErrorMsg.resetPositioning filename;
adamc@201:                             Lex.UserDeclarations.initialize ())
adamc@201: 	          val file = TextIO.openIn filename
adamc@201: 	          fun get _ = TextIO.input file
adamc@201: 	          fun parseerror (s, p1, p2) = ErrorMsg.errorAt' (p1, p2) s
adamc@201: 	          val lexer = LrParser.Stream.streamify (Lex.makeLexer get)
adamc@244: 	          val (absyn, _) = UrwebP.parse (30, lexer, parseerror, ())
adamc@201:               in
adamc@201:                   TextIO.closeIn file;
adamc@201:                   case absyn of
adamc@201:                       [(Source.DSgn ("?", _), _)] =>
adamc@201:                       (ErrorMsg.errorAt {file = filename,
adamc@201:                                          first = {line = 0,
adamc@201:                                                   char = 0},
adamc@201:                                          last = {line = 0,
adamc@201:                                                  char = 0}} "File starts with 'sig'";
adamc@201:                        [])
adamc@201:                     | _ => absyn
adamc@201:               end
adamc@201:               handle LrParser.ParseError => [],
adamc@201:      print = SourcePrint.p_file}    
adamc@56: 
adamc@274: fun p_job {database, exe, sql, sources, debug} =
adamc@270:     let
adamc@270:         open Print.PD
adamc@270:         open Print
adamc@270:     in
adamc@274:         box [if debug then
adamc@274:                  box [string "DEBUG", newline]
adamc@274:              else
adamc@274:                  box [],
adamc@274:              case database of
adamc@270:                  NONE => string "No database."
adamc@270:                | SOME db => string ("Database: " ^ db),
adamc@270:              newline,
adamc@274:              string "Exe: ",
adamc@274:              string exe,
adamc@274:              newline,
adamc@274:              case sql of
adamc@274:                  NONE => string "No SQL file."
adamc@274:                | SOME sql => string ("SQL fle: " ^ sql),
adamc@270:              string "Sources:",
adamc@270:              p_list string sources,
adamc@270:              newline]
adamc@270:     end
adamc@270: 
adamc@270: fun trim s =
adamc@270:     let
adamc@270:         val (_, s) = Substring.splitl Char.isSpace s
adamc@270:         val (s, _) = Substring.splitr Char.isSpace s
adamc@270:     in
adamc@270:         s
adamc@270:     end
adamc@270: 
adamc@270: val parseUrp = {
adamc@270:     func = fn filename =>
adamc@270:               let
adamc@270:                   val dir = OS.Path.dir filename
adamc@270:                   val inf = TextIO.openIn (OS.Path.joinBaseExt {base = filename, ext = SOME "urp"})
adamc@270: 
adamc@274:                   fun relify fname =
adamc@274:                       OS.Path.concat (dir, fname)
adamc@274:                       handle OS.Path.Path => fname
adamc@274: 
adamc@270:                   fun readSources acc =
adamc@270:                       case TextIO.inputLine inf of
adamc@270:                           NONE => rev acc
adamc@270:                         | SOME line =>
adamc@270:                           let
adamc@270:                               val acc = if CharVector.all Char.isSpace line then
adamc@270:                                             acc
adamc@270:                                         else
adamc@270:                                             let
adamc@270:                                                 val fname = String.implode (List.filter (fn x => not (Char.isSpace x))
adamc@270:                                                                                         (String.explode line))
adamc@274:                                                 val fname = relify fname
adamc@270:                                             in
adamc@270:                                                 fname :: acc
adamc@270:                                             end
adamc@270:                           in
adamc@270:                               readSources acc
adamc@270:                           end
adamc@270: 
adamc@274:                   fun finish (database, exe, sql, debug, sources) =
adamc@274:                       {database = database,
adamc@274:                        exe = Option.getOpt (exe, OS.Path.joinBaseExt {base = OS.Path.base filename,
adamc@274:                                                                       ext = SOME "exe"}),
adamc@274:                        sql = sql,
adamc@274:                        debug = debug,
adamc@274:                        sources = sources}
adamc@274: 
adamc@274:                   fun read (database, exe, sql, debug) =
adamc@270:                       case TextIO.inputLine inf of
adamc@274:                           NONE => finish (database, exe, sql, debug, [])
adamc@274:                         | SOME "\n" => finish (database, exe, sql, debug, readSources [])
adamc@270:                         | SOME line =>
adamc@270:                           let
adamc@270:                               val (cmd, arg) = Substring.splitl (fn x => not (Char.isSpace x)) (Substring.full line)
adamc@270:                               val cmd = Substring.string (trim cmd)
adamc@270:                               val arg = Substring.string (trim arg)
adamc@270:                           in
adamc@270:                               case cmd of
adamc@270:                                   "database" =>
adamc@270:                                   (case database of
adamc@270:                                        NONE => ()
adamc@270:                                      | SOME _ => ErrorMsg.error "Duplicate 'database' directive";
adamc@274:                                    read (SOME arg, exe, sql, debug))
adamc@274:                                 | "exe" =>
adamc@274:                                   (case exe of
adamc@274:                                        NONE => ()
adamc@274:                                      | SOME _ => ErrorMsg.error "Duplicate 'exe' directive";
adamc@274:                                    read (database, SOME (relify arg), sql, debug))
adamc@274:                                 | "sql" =>
adamc@274:                                   (case sql of
adamc@274:                                        NONE => ()
adamc@274:                                      | SOME _ => ErrorMsg.error "Duplicate 'sql' directive";
adamc@274:                                    read (database, exe, SOME (relify arg), debug))
adamc@274:                                 | "debug" => read (database, exe, sql, true)
adamc@270:                                 | _ => (ErrorMsg.error ("Unrecognized command '" ^ cmd ^ "'");
adamc@274:                                         read (database, exe, sql, debug))
adamc@270:                           end
adamc@270:               in
adamc@274:                   read (NONE, NONE, NONE, false)
adamc@270:                   before TextIO.closeIn inf
adamc@270:               end,
adamc@270:     print = p_job
adamc@270: }
adamc@270: 
adamc@270: val toParseJob = transform parseUrp "parseJob"
adamc@270: 
adamc@56: fun capitalize "" = ""
adamc@56:   | capitalize s = str (Char.toUpper (String.sub (s, 0))) ^ String.extract (s, 1, NONE)
adamc@56: 
adamc@201: val parse = {
adamc@274:     func = fn {database, sources = fnames, ...} : job =>
adamc@201:               let
adamc@201:                   fun nameOf fname = capitalize (OS.Path.file fname)
adamc@109: 
adamc@201:                   fun parseOne fname =
adamc@201:                       let
adamc@201:                           val mname = nameOf fname
adamc@244:                           val ur = OS.Path.joinBaseExt {base = fname, ext = SOME "ur"}
adamc@244:                           val urs = OS.Path.joinBaseExt {base = fname, ext = SOME "urs"}
adamc@56: 
adamc@201:                           val sgnO =
adamc@244:                               if Posix.FileSys.access (urs, []) then
adamc@244:                                   SOME (Source.SgnConst (#func parseUrs urs),
adamc@244:                                         {file = urs,
adamc@201:                                          first = ErrorMsg.dummyPos,
adamc@201:                                          last = ErrorMsg.dummyPos})
adamc@201:                               else
adamc@201:                                   NONE
adamc@56: 
adamc@244:                           val loc = {file = ur,
adamc@201:                                      first = ErrorMsg.dummyPos,
adamc@201:                                      last = ErrorMsg.dummyPos}
adamc@56: 
adamc@244:                           val ds = #func parseUr ur
adamc@201:                       in
adamc@201:                           (Source.DStr (mname, sgnO, (Source.StrConst ds, loc)), loc)
adamc@201:                       end
adamc@56: 
adamc@201:                   val ds = map parseOne fnames
adamc@201:               in
adamc@201:                   let
adamc@201:                       val final = nameOf (List.last fnames)
adamc@271: 
adamc@271:                       val ds = ds @ [(Source.DExport (Source.StrVar final, ErrorMsg.dummySpan), ErrorMsg.dummySpan)]
adamc@201:                   in
adamc@271:                       case database of
adamc@271:                           NONE => ds
adamc@271:                         | SOME s => (Source.DDatabase s, ErrorMsg.dummySpan) :: ds
adamc@201:                   end handle Empty => ds
adamc@201:               end,
adamc@201:     print = SourcePrint.p_file
adamc@201: }
adamc@56: 
adamc@270: val toParse = transform parse "parse" o toParseJob
adamc@38: 
adamc@201: val elaborate = {
adamc@201:     func = fn file => let
adamc@244:                   val basis = #func parseUrs "lib/basis.urs"
adamc@201:               in
adamc@201:                   Elaborate.elabFile basis ElabEnv.empty file
adamc@201:               end,
adamc@201:     print = ElabPrint.p_file ElabEnv.empty
adamc@201: }
adamc@5: 
adamc@270: val toElaborate = transform elaborate "elaborate" o toParse
adamc@201: 
adamc@201: val explify = {
adamc@201:     func = Explify.explify,
adamc@201:     print = ExplPrint.p_file ExplEnv.empty
adamc@201: }
adamc@201: 
adamc@270: val toExplify = transform explify "explify" o toElaborate
adamc@201: 
adamc@201: val corify = {
adamc@201:     func = Corify.corify,
adamc@201:     print = CorePrint.p_file CoreEnv.empty
adamc@201: }
adamc@201: 
adamc@270: val toCorify = transform corify "corify" o toExplify
adamc@201: 
adamc@202: val shake = {
adamc@202:     func = Shake.shake,
adamc@202:     print = CorePrint.p_file CoreEnv.empty
adamc@202: }
adamc@39: 
adamc@270: val toShake1 = transform shake "shake1" o toCorify
adamc@110: 
adamc@202: val tag = {
adamc@202:     func = Tag.tag,
adamc@202:     print = CorePrint.p_file CoreEnv.empty
adamc@202: }
adamc@193: 
adamc@270: val toTag = transform tag "tag" o toShake1
adamc@20: 
adamc@202: val reduce = {
adamc@202:     func = Reduce.reduce,
adamc@202:     print = CorePrint.p_file CoreEnv.empty
adamc@202: }
adamc@25: 
adamc@270: val toReduce = transform reduce "reduce" o toTag
adamc@23: 
adamc@202: val specialize = {
adamc@202:     func = Specialize.specialize,
adamc@202:     print = CorePrint.p_file CoreEnv.empty
adamc@202: }
adamc@132: 
adamc@270: val toSpecialize = transform specialize "specialize" o toReduce
adamc@131: 
adamc@270: val toShake2 = transform shake "shake2" o toSpecialize
adamc@133: 
adamc@202: val monoize = {
adamc@202:     func = Monoize.monoize CoreEnv.empty,
adamc@202:     print = MonoPrint.p_file MonoEnv.empty
adamc@202: }
adamc@134: 
adamc@270: val toMonoize = transform monoize "monoize" o toShake2
adamc@96: 
adamc@202: val mono_opt = {
adamc@202:     func = MonoOpt.optimize,
adamc@202:     print = MonoPrint.p_file MonoEnv.empty
adamc@202: }
adamc@29: 
adamc@270: val toMono_opt1 = transform mono_opt "mono_opt1" o toMonoize
adamc@5: 
adamc@202: val untangle = {
adamc@202:     func = Untangle.untangle,
adamc@202:     print = MonoPrint.p_file MonoEnv.empty
adamc@202: }
adamc@1: 
adamc@270: val toUntangle = transform untangle "untangle" o toMono_opt1
adamc@38: 
adamc@202: val mono_reduce = {
adamc@202:     func = MonoReduce.reduce,
adamc@202:     print = MonoPrint.p_file MonoEnv.empty
adamc@202: }
adamc@16: 
adamc@270: val toMono_reduce = transform mono_reduce "mono_reduce" o toUntangle
adamc@39: 
adamc@202: val mono_shake = {
adamc@202:     func = MonoShake.shake,
adamc@202:     print = MonoPrint.p_file MonoEnv.empty
adamc@202: }
adamc@110: 
adamc@270: val toMono_shake = transform mono_shake "mono_shake1" o toMono_reduce
adamc@193: 
adamc@270: val toMono_opt2 = transform mono_opt "mono_opt2" o toMono_shake
adamc@20: 
adamc@202: val cjrize = {
adamc@202:     func = Cjrize.cjrize,
adamc@202:     print = CjrPrint.p_file CjrEnv.empty
adamc@202: }
adamc@23: 
adamc@270: val toCjrize = transform cjrize "cjrize" o toMono_opt2
adamc@29: 
adamc@274: val sqlify = {
adamc@274:     func = Cjrize.cjrize,
adamc@274:     print = CjrPrint.p_sql CjrEnv.empty
adamc@274: }
adamc@274: 
adamc@274: val toSqlify = transform sqlify "sqlify" o toMono_opt2
adamc@274: 
adamc@183: fun compileC {cname, oname, ename} =
adamc@183:     let
adamc@183:         val compile = "gcc -O3 -I include -c " ^ cname ^ " -o " ^ oname
adamc@272:         val link = "gcc -O3 -pthread -lpq clib/urweb.o " ^ oname ^ " clib/driver.o -o " ^ ename
adamc@183:     in
adamc@183:         if not (OS.Process.isSuccess (OS.Process.system compile)) then
adamc@183:             print "C compilation failed\n"
adamc@183:         else if not (OS.Process.isSuccess (OS.Process.system link)) then
adamc@186:             print "C linking failed\n"
adamc@183:         else
adamc@183:             print "Success\n"
adamc@183:     end
adamc@183: 
adamc@202: fun compile job =
adamc@202:     case run toCjrize job of
adamc@244:         NONE => print "Ur compilation failed\n"
adamc@29:       | SOME file =>
adamc@202:         let
adamc@274:             val job = valOf (run (transform parseUrp "parseUrp") job)
adamc@102: 
adamc@274:             val (cname, oname, cleanup) =
adamc@274:                 if #debug job then
adamc@274:                     ("/tmp/urweb.c", "/tmp/urweb.o", fn () => ())
adamc@274:                 else
adamc@274:                     let
adamc@274:                         val dir = OS.FileSys.tmpName ()
adamc@274:                         val cname = OS.Path.joinDirFile {dir = dir, file = "urweb.c"}
adamc@274:                         val oname = OS.Path.joinDirFile {dir = dir, file = "urweb.o"}
adamc@274:                     in
adamc@274:                         OS.FileSys.mkDir dir;
adamc@274:                         (cname, oname,
adamc@274:                          fn () => (OS.FileSys.remove cname;
adamc@274:                                    OS.FileSys.remove oname;
adamc@274:                                    OS.FileSys.rmDir dir))
adamc@274:                     end
adamc@274:             val ename = #exe job
adamc@202:         in
adamc@274:             let
adamc@274:                 val outf = TextIO.openOut cname
adamc@274:                 val s = TextIOPP.openOut {dst = outf, wid = 80}
adamc@274:             in
adamc@274:                 Print.fprint s (CjrPrint.p_file CjrEnv.empty file);
adamc@274:                 TextIO.closeOut outf;
adamc@102: 
adamc@274:                 case #sql job of
adamc@274:                     NONE => ()
adamc@274:                   | SOME sql =>
adamc@274:                     let
adamc@274:                         val outf = TextIO.openOut sql
adamc@274:                         val s = TextIOPP.openOut {dst = outf, wid = 80}
adamc@274:                     in
adamc@274:                         Print.fprint s (CjrPrint.p_sql CjrEnv.empty file);
adamc@274:                         TextIO.closeOut outf
adamc@274:                     end;
adamc@274: 
adamc@274:                 compileC {cname = cname, oname = oname, ename = ename};
adamc@274:                 
adamc@274:                 cleanup ()
adamc@274:             end
adamc@274:             handle ex => (((cleanup ()) handle _ => ()); raise ex)
adamc@202:         end
adamc@29: 
adamc@1: end