Mercurial > urweb
view src/mono_opt.sml @ 1360:02fc16faecf3
[De]serialization of times in JavaScript; proper integer division in JavaScript; Basis.crypt; Top.mkRead'; more aggressive Mono-level inlining, for values of function-y types
| author | Adam Chlipala <adam@chlipala.net> |
|---|---|
| date | Thu, 23 Dec 2010 17:46:40 -0500 |
| parents | 32c8a3509369 |
| children | 6e6f1643c4e9 |
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(* Copyright (c) 2008-2010, Adam Chlipala * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - The names of contributors may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. *) structure MonoOpt :> MONO_OPT = struct open Mono structure U = MonoUtil fun typ t = t fun decl d = d fun attrifyInt n = if n < 0 then "-" ^ Int64.toString (Int64.~ n) else Int64.toString n fun attrifyFloat n = if n < 0.0 then "-" ^ Real.toString (Real.~ n) else Real.toString n fun attrifyChar ch = case ch of #"\"" => """ | #"&" => "&" | ch => str ch val attrifyString = String.translate attrifyChar val urlifyInt = attrifyInt val urlifyFloat = attrifyFloat val htmlifyInt = attrifyInt val htmlifyFloat = attrifyFloat val htmlifyString = String.translate (fn #"<" => "<" | #"&" => "&" | ch => str ch) fun htmlifySpecialChar ch = "&#" ^ Int.toString (ord ch) ^ ";" fun hexIt ch = let val s = Int.fmt StringCvt.HEX (ord ch) in case size s of 0 => "00" | 1 => "0" ^ s | _ => s end fun urlifyString s = case s of "" => "_" | _ => (if String.sub (s, 0) = #"_" then "_" else "") ^ String.translate (fn #" " => "+" | ch => if Char.isAlphaNum ch then str ch else "." ^ hexIt ch) s fun sqlifyInt n = #p_cast (Settings.currentDbms ()) (attrifyInt n, Settings.Int) fun sqlifyFloat n = #p_cast (Settings.currentDbms ()) (attrifyFloat n, Settings.Float) fun sqlifyString s = #sqlifyString (Settings.currentDbms ()) s fun sqlifyChar ch = #sqlifyString (Settings.currentDbms ()) (str ch) fun unAs s = let fun doChars (cs, acc) = case cs of #"T" :: #"_" :: #"T" :: #"." :: cs => doChars (cs, acc) | #"'" :: cs => doString (cs, acc) | ch :: cs => doChars (cs, ch :: acc) | [] => String.implode (rev acc) and doString (cs, acc) = case cs of #"\\" :: #"\\" :: cs => doString (cs, #"\\" :: #"\\" :: acc) | #"\\" :: #"'" :: cs => doString (cs, #"'" :: #"\\" :: acc) | #"'" :: cs => doChars (cs, #"'" :: acc) | ch :: cs => doString (cs, ch :: acc) | [] => String.implode (rev acc) in doChars (String.explode s, []) end fun checkUrl s = CharVector.all Char.isGraph s andalso Settings.checkUrl s fun exp e = case e of EPrim (Prim.String s) => let val (_, chs) = CharVector.foldl (fn (ch, (lastSpace, chs)) => let val isSpace = Char.isSpace ch in if isSpace andalso lastSpace then (true, chs) else (isSpace, ch :: chs) end) (false, []) s in EPrim (Prim.String (String.implode (rev chs))) end | EFfiApp ("Basis", "strcat", [e1, e2]) => exp (EStrcat (e1, e2)) | EStrcat ((EPrim (Prim.String s1), loc), (EPrim (Prim.String s2), _)) => let val s = if size s1 > 0 andalso size s2 > 0 andalso Char.isSpace (String.sub (s1, size s1 - 1)) andalso Char.isSpace (String.sub (s2, 0)) then s1 ^ String.extract (s2, 1, NONE) else s1 ^ s2 in EPrim (Prim.String s) end | EStrcat ((EPrim (Prim.String s1), loc), (EStrcat ((EPrim (Prim.String s2), _), rest), _)) => let val s = if size s1 > 0 andalso size s2 > 0 andalso Char.isSpace (String.sub (s1, size s1 - 1)) andalso Char.isSpace (String.sub (s2, 0)) then s1 ^ String.extract (s2, 1, NONE) else s1 ^ s2 in EStrcat ((EPrim (Prim.String s), loc), rest) end | EStrcat ((EStrcat (e1, e2), loc), e3) => optExp (EStrcat (e1, (EStrcat (e2, e3), loc)), loc) | EWrite (EStrcat (e1, e2), loc) => ESeq ((optExp (EWrite e1, loc), loc), (optExp (EWrite e2, loc), loc)) | ESeq ((EWrite (EPrim (Prim.String s1), _), loc), (EWrite (EPrim (Prim.String s2), _), _)) => EWrite (EPrim (Prim.String (s1 ^ s2)), loc) | ESeq ((EWrite (EPrim (Prim.String s1), _), loc), (ESeq ((EWrite (EPrim (Prim.String s2), _), _), e), _)) => ESeq ((EWrite (EPrim (Prim.String (s1 ^ s2)), loc), loc), e) | EFfiApp ("Basis", "htmlifySpecialChar", [(EPrim (Prim.Char ch), _)]) => EPrim (Prim.String (htmlifySpecialChar ch)) | EWrite (EFfiApp ("Basis", "htmlifySpecialChar", [e]), _) => EFfiApp ("Basis", "htmlifySpecialChar_w", [e]) | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "intToString", [(EPrim (Prim.Int n), _)]), _)]) => EPrim (Prim.String (htmlifyInt n)) | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "intToString", es), _)]) => EFfiApp ("Basis", "htmlifyInt", es) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "intToString"), _), (EPrim (Prim.Int n), _)), _)]) => EPrim (Prim.String (htmlifyInt n)) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "intToString"), _), e), _)]) => EFfiApp ("Basis", "htmlifyInt", [e]) | EWrite (EFfiApp ("Basis", "htmlifyInt", [e]), _) => EFfiApp ("Basis", "htmlifyInt_w", [e]) | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "floatToString", [(EPrim (Prim.Float n), _)]), _)]) => EPrim (Prim.String (htmlifyFloat n)) | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "floatToString", es), _)]) => EFfiApp ("Basis", "htmlifyFloat", es) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "floatToString"), _), (EPrim (Prim.Float n), _)), _)]) => EPrim (Prim.String (htmlifyFloat n)) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "floatToString"), _), e), _)]) => EFfiApp ("Basis", "htmlifyFloat", [e]) | EWrite (EFfiApp ("Basis", "htmlifyFloat", [e]), _) => EFfiApp ("Basis", "htmlifyFloat_w", [e]) | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "boolToString", [(ECon (Enum, PConFfi {con = "True", ...}, NONE), _)]), _)]) => EPrim (Prim.String "True") | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "boolToString", [(ECon (Enum, PConFfi {con = "False", ...}, NONE), _)]), _)]) => EPrim (Prim.String "False") | EFfiApp ("Basis", "htmlifyString", [(EFfiApp ("Basis", "boolToString", es), _)]) => EFfiApp ("Basis", "htmlifyBool", es) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "boolToString"), _), (ECon (Enum, PConFfi {con = "True", ...}, NONE), _)), _)]) => EPrim (Prim.String "True") | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "boolToString"), _), (ECon (Enum, PConFfi {con = "False", ...}, NONE), _)), _)]) => EPrim (Prim.String "False") | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "boolToString"), _), e), _)]) => EFfiApp ("Basis", "htmlifyBool", [e]) | EWrite (EFfiApp ("Basis", "htmlifyBool", [e]), _) => EFfiApp ("Basis", "htmlifyBool_w", [e]) | EFfiApp ("Basis", "htmlifyString", [(EApp ((EFfi ("Basis", "timeToString"), _), e), _)]) => EFfiApp ("Basis", "htmlifyTime", [e]) | EFfiApp ("Basis", "htmlifyString_w", [(EApp ((EFfi ("Basis", "timeToString"), _), e), _)]) => EFfiApp ("Basis", "htmlifyTime_w", [e]) | EWrite (EFfiApp ("Basis", "htmlifyTime", [e]), _) => EFfiApp ("Basis", "htmlifyTime_w", [e]) | EFfiApp ("Basis", "htmlifyString", [(EPrim (Prim.String s), _)]) => EPrim (Prim.String (htmlifyString s)) | EWrite (EFfiApp ("Basis", "htmlifyString", [(EPrim (Prim.String s), _)]), loc) => EWrite (EPrim (Prim.String (htmlifyString s)), loc) | EWrite (EFfiApp ("Basis", "htmlifyString", [e]), _) => EFfiApp ("Basis", "htmlifyString_w", [e]) | EFfiApp ("Basis", "htmlifyString_w", [(EPrim (Prim.String s), loc)]) => EWrite (EPrim (Prim.String (htmlifyString s)), loc) | EFfiApp ("Basis", "attrifyInt", [(EPrim (Prim.Int n), _)]) => EPrim (Prim.String (attrifyInt n)) | EWrite (EFfiApp ("Basis", "attrifyInt", [(EPrim (Prim.Int n), _)]), loc) => EWrite (EPrim (Prim.String (attrifyInt n)), loc) | EWrite (EFfiApp ("Basis", "attrifyInt", [e]), _) => EFfiApp ("Basis", "attrifyInt_w", [e]) | EFfiApp ("Basis", "attrifyFloat", [(EPrim (Prim.Float n), _)]) => EPrim (Prim.String (attrifyFloat n)) | EWrite (EFfiApp ("Basis", "attrifyFloat", [(EPrim (Prim.Float n), _)]), loc) => EWrite (EPrim (Prim.String (attrifyFloat n)), loc) | EWrite (EFfiApp ("Basis", "attrifyFloat", [e]), _) => EFfiApp ("Basis", "attrifyFloat_w", [e]) | EFfiApp ("Basis", "attrifyString", [(EPrim (Prim.String s), _)]) => EPrim (Prim.String (attrifyString s)) | EWrite (EFfiApp ("Basis", "attrifyString", [(EPrim (Prim.String s), _)]), loc) => EWrite (EPrim (Prim.String (attrifyString s)), loc) | EWrite (EFfiApp ("Basis", "attrifyString", [e]), _) => EFfiApp ("Basis", "attrifyString_w", [e]) | EFfiApp ("Basis", "attrifyChar", [(EPrim (Prim.Char s), _)]) => EPrim (Prim.String (attrifyChar s)) | EWrite (EFfiApp ("Basis", "attrifyChar", [(EPrim (Prim.Char s), _)]), loc) => EWrite (EPrim (Prim.String (attrifyChar s)), loc) | EWrite (EFfiApp ("Basis", "attrifyChar", [e]), _) => EFfiApp ("Basis", "attrifyChar_w", [e]) | EFfiApp ("Basis", "attrifyCss_class", [(EPrim (Prim.String s), _)]) => EPrim (Prim.String s) | EWrite (EFfiApp ("Basis", "attrifyCss_class", [(EPrim (Prim.String s), _)]), loc) => EWrite (EPrim (Prim.String s), loc) | EWrite (EFfiApp ("Basis", "attrifyCss_class", [e]), _) => EFfiApp ("Basis", "attrifyString_w", [e]) | EFfiApp ("Basis", "urlifyInt", [(EPrim (Prim.Int n), _)]) => EPrim (Prim.String (urlifyInt n)) | EWrite (EFfiApp ("Basis", "urlifyInt", [(EPrim (Prim.Int n), _)]), loc) => EWrite (EPrim (Prim.String (urlifyInt n)), loc) | EWrite (EFfiApp ("Basis", "urlifyInt", [e]), _) => EFfiApp ("Basis", "urlifyInt_w", [e]) | EFfiApp ("Basis", "urlifyFloat", [(EPrim (Prim.Float n), _)]) => EPrim (Prim.String (urlifyFloat n)) | EWrite (EFfiApp ("Basis", "urlifyFloat", [(EPrim (Prim.Float n), _)]), loc) => EWrite (EPrim (Prim.String (urlifyFloat n)), loc) | EWrite (EFfiApp ("Basis", "urlifyFloat", [e]), _) => EFfiApp ("Basis", "urlifyFloat_w", [e]) | EFfiApp ("Basis", "urlifyString", [(EPrim (Prim.String s), _)]) => EPrim (Prim.String (urlifyString s)) | EWrite (EFfiApp ("Basis", "urlifyString", [(EPrim (Prim.String s), _)]), loc) => EWrite (EPrim (Prim.String (urlifyString s)), loc) | EWrite (EFfiApp ("Basis", "urlifyString", [e]), _) => EFfiApp ("Basis", "urlifyString_w", [e]) | EFfiApp ("Basis", "urlifyBool", [(ECon (Enum, PConFfi {con = "True", ...}, NONE), _)]) => EPrim (Prim.String "1") | EFfiApp ("Basis", "urlifyBool", [(ECon (Enum, PConFfi {con = "False", ...}, NONE), _)]) => EPrim (Prim.String "0") | EWrite (EFfiApp ("Basis", "urlifyBool", [(ECon (Enum, PConFfi {con = "True", ...}, NONE), _)]), loc) => EWrite (EPrim (Prim.String "1"), loc) | EWrite (EFfiApp ("Basis", "urlifyBool", [(ECon (Enum, PConFfi {con = "False", ...}, NONE), _)]), loc) => EWrite (EPrim (Prim.String "0"), loc) | EWrite (EFfiApp ("Basis", "urlifyBool", [e]), _) => EFfiApp ("Basis", "urlifyBool_w", [e]) | EFfiApp ("Basis", "sqlifyInt", [(EPrim (Prim.Int n), _)]) => EPrim (Prim.String (sqlifyInt n)) | EFfiApp ("Basis", "sqlifyIntN", [(ENone _, _)]) => EPrim (Prim.String "NULL") | EFfiApp ("Basis", "sqlifyIntN", [(ESome (_, (EPrim (Prim.Int n), _)), _)]) => EPrim (Prim.String (sqlifyInt n)) | EFfiApp ("Basis", "sqlifyFloat", [(EPrim (Prim.Float n), _)]) => EPrim (Prim.String (sqlifyFloat n)) | EFfiApp ("Basis", "sqlifyBool", [b as (_, loc)]) => optExp (ECase (b, [((PCon (Enum, PConFfi {mod = "Basis", datatyp = "bool", con = "True", arg = NONE}, NONE), loc), (EPrim (Prim.String (#trueString (Settings.currentDbms ()))), loc)), ((PCon (Enum, PConFfi {mod = "Basis", datatyp = "bool", con = "False", arg = NONE}, NONE), loc), (EPrim (Prim.String (#falseString (Settings.currentDbms ()))), loc))], {disc = (TFfi ("Basis", "bool"), loc), result = (TFfi ("Basis", "string"), loc)}), loc) | EFfiApp ("Basis", "sqlifyString", [(EPrim (Prim.String n), _)]) => EPrim (Prim.String (sqlifyString n)) | EFfiApp ("Basis", "sqlifyChar", [(EPrim (Prim.Char n), _)]) => EPrim (Prim.String (sqlifyChar n)) | EWrite (ECase (discE, pes, {disc, ...}), loc) => optExp (ECase (discE, map (fn (p, e) => (p, (EWrite e, loc))) pes, {disc = disc, result = (TRecord [], loc)}), loc) | EApp ((ECase (discE, pes, {disc, result = (TFun (_, ran), _)}), loc), arg as (ERecord [], _)) => let fun doBody e = case #1 e of EAbs (_, _, _, body) => MonoReduce.subExpInExp (0, arg) body | _ => (EApp (e, arg), loc) in optExp (ECase (discE, map (fn (p, e) => (p, doBody e)) pes, {disc = disc, result = ran}), loc) end | ECase (discE, pes, {disc, result = (TFun (dom, ran), loc)}) => let fun doBody (p, e) = let val pb = MonoEnv.patBindsN p in (EApp (MonoEnv.liftExpInExp pb e, (ERel pb, loc)), loc) end in EAbs ("x", dom, ran, (optExp (ECase (MonoEnv.liftExpInExp 0 discE, map (fn (p, e) => (p, doBody (p, e))) pes, {disc = disc, result = ran}), loc), loc)) end | EWrite (EQuery {exps, tables, state, query, initial = (EPrim (Prim.String ""), _), body = (EStrcat ((EPrim (Prim.String s), _), (EStrcat ((ERel 0, _), e'), _)), _)}, loc) => if CharVector.all Char.isSpace s then EQuery {exps = exps, tables = tables, query = query, state = (TRecord [], loc), initial = (ERecord [], loc), body = (optExp (EWrite e', loc), loc)} else e | EWrite (EQuery {exps, tables, state, query, initial = (EPrim (Prim.String ""), _), body}, loc) => let fun passLets (depth, (e', _), lets) = case e' of EStrcat ((ERel x, _), e'') => if x = depth then let val body = (optExp (EWrite e'', loc), loc) val body = foldl (fn ((x, t, e'), e) => (ELet (x, t, e', e), loc)) body lets in EQuery {exps = exps, tables = tables, query = query, state = (TRecord [], loc), initial = (ERecord [], loc), body = body} end else e | ELet (x, t, e', e'') => passLets (depth + 1, e'', (x, t, e') :: lets) | _ => e in passLets (0, body, []) end (*| EWrite (EQuery {exps, tables, state, query, initial = (EPrim (Prim.String ""), _), body = (EStrcat ((ERel 0, _), e'), _)}, loc) => EQuery {exps = exps, tables = tables, query = query, state = (TRecord [], loc), initial = (ERecord [], loc), body = (optExp (EWrite e', loc), loc)}*) | EWrite (ELet (x, t, e1, e2), loc) => optExp (ELet (x, t, e1, (EWrite e2, loc)), loc) | EWrite (EPrim (Prim.String ""), loc) => ERecord [] | ESignalBind ((ESignalReturn e1, loc), e2) => optExp (EApp (e2, e1), loc) | EFfiApp ("Basis", "bless", [(se as EPrim (Prim.String s), loc)]) => (if checkUrl s then () else ErrorMsg.errorAt loc ("Invalid URL " ^ s ^ " passed to 'bless'"); se) | EFfiApp ("Basis", "checkUrl", [(se as EPrim (Prim.String s), loc)]) => (if checkUrl s then ESome ((TFfi ("Basis", "string"), loc), (se, loc)) else ENone (TFfi ("Basis", "string"), loc)) | EFfiApp ("Basis", "blessMime", [(se as EPrim (Prim.String s), loc)]) => (if Settings.checkMime s then () else ErrorMsg.errorAt loc ("Invalid string " ^ s ^ " passed to 'blessMime'"); se) | EFfiApp ("Basis", "checkString", [(EPrim (Prim.String s), loc)]) => let fun uwify (cs, acc) = case cs of [] => String.concat (rev acc) | #"(" :: #"_" :: cs => uwify (cs, "(uw_" :: acc) | #" " :: #"_" :: cs => uwify (cs, " uw_" :: acc) | #"'" :: cs => let fun waitItOut (cs, acc) = case cs of [] => raise Fail "MonoOpt: Unterminated SQL string literal" | #"'" :: cs => uwify (cs, "'" :: acc) | #"\\" :: #"'" :: cs => waitItOut (cs, "\\'" :: acc) | #"\\" :: #"\\" :: cs => waitItOut (cs, "\\\\" :: acc) | c :: cs => waitItOut (cs, str c :: acc) in waitItOut (cs, "'" :: acc) end | c :: cs => uwify (cs, str c :: acc) val s = case String.explode s of #"_" :: cs => uwify (cs, ["uw_"]) | cs => uwify (cs, []) in EPrim (Prim.String s) end | EFfiApp ("Basis", "viewify", [(EPrim (Prim.String s), loc)]) => let fun uwify (cs, acc) = case cs of [] => String.concat (rev acc) | #"A" :: #"S" :: #" " :: #"_" :: cs => uwify (cs, "AS uw_" :: acc) | #"'" :: cs => let fun waitItOut (cs, acc) = case cs of [] => raise Fail "MonoOpt: Unterminated SQL string literal" | #"'" :: cs => uwify (cs, "'" :: acc) | #"\\" :: #"'" :: cs => waitItOut (cs, "\\'" :: acc) | #"\\" :: #"\\" :: cs => waitItOut (cs, "\\\\" :: acc) | c :: cs => waitItOut (cs, str c :: acc) in waitItOut (cs, "'" :: acc) end | c :: cs => uwify (cs, str c :: acc) val s = uwify (String.explode s, []) in EPrim (Prim.String s) end | EFfiApp ("Basis", "unAs", [(EPrim (Prim.String s), _)]) => EPrim (Prim.String (unAs s)) | EFfiApp ("Basis", "unAs", [e']) => let fun parts (e as (_, loc)) = case #1 e of EStrcat (s1, s2) => (case (parts s1, parts s2) of (SOME p1, SOME p2) => SOME (p1 @ p2) | _ => NONE) | EPrim (Prim.String s) => SOME [(EPrim (Prim.String (unAs s)), loc)] | EFfiApp ("Basis", f, [_]) => if String.isPrefix "sqlify" f then SOME [e] else NONE | _ => NONE in case parts e' of SOME [e] => #1 e | SOME es => (case rev es of (e as (_, loc)) :: es => #1 (foldl (fn (e, es) => (EStrcat (e, es), loc)) e es) | [] => raise Fail "MonoOpt impossible nil") | NONE => e end | EFfiApp ("Basis", "str1", [(EPrim (Prim.Char ch), _)]) => EPrim (Prim.String (str ch)) | EFfiApp ("Basis", "attrifyString", [(EFfiApp ("Basis", "str1", [e]), _)]) => EFfiApp ("Basis", "attrifyChar", [e]) | EFfiApp ("Basis", "attrifyString_w", [(EFfiApp ("Basis", "str1", [e]), _)]) => EFfiApp ("Basis", "attrifyChar_w", [e]) | EBinop (_, "+", (EPrim (Prim.Int n1), _), (EPrim (Prim.Int n2), _)) => EPrim (Prim.Int (Int64.+ (n1, n2))) | _ => e and optExp e = #1 (U.Exp.map {typ = typ, exp = exp} e) val optimize = U.File.map {typ = typ, exp = exp, decl = decl} val optExp = U.Exp.map {typ = typ, exp = exp} end