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authordos-reis <gdr@axiomatics.org>2007-08-14 05:14:52 +0000
committerdos-reis <gdr@axiomatics.org>2007-08-14 05:14:52 +0000
commitab8cc85adde879fb963c94d15675783f2cf4b183 (patch)
treec202482327f474583b750b2c45dedfc4e4312b1d /src/interp/i-code.boot.pamphlet
downloadopen-axiom-ab8cc85adde879fb963c94d15675783f2cf4b183.tar.gz
Initial population.
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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/interp i-code.boot}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{License}
+<<license>>=
+-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+-- 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.
+--
+-- - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+-- names of its contributors may 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.
+
+@
+<<*>>=
+<<license>>
+
+--% Interpreter Code Generation Routines
+
+--Modified by JHD 9/9/93 to fix a problem with coerces inside
+--interpreter functions being used as mappings. They were being
+--handled with $useCoerceOrCroak being NIL, and therefore internal
+--coercions were not correctly handled. Fix: remove dependence
+--on $useCoerceOrCroak, and test explicitly for Mapping types.
+
+--% COERCE
+
+intCodeGenCOERCE(triple,t2) ==
+ -- NOTE: returns a triple
+ t1 := objMode triple
+ t1 = $EmptyMode => NIL
+ t1 = t2 => triple
+ val := objVal triple
+
+ -- if request is for a coerce to t2 from a coerce from
+ -- to to t1, and t1 = Void or canCoerce(t0,t2), then optimize
+
+ (val is ['coerceOrCroak,trip,t1', .]) and
+ (t0 := objCodeMode trip) and ([.,val0] := objCodeVal trip) and
+ ( (t1 = $Void) or canCoerceFrom(removeQuote t0,t2) ) =>
+ -- just generate code for coercion, don't coerce constants
+ -- might be too big
+ intCodeGenCOERCE(objNew(val0, removeQuote t0), t2)
+
+ val is ['THROW,label,code] =>
+ if label is ['QUOTE, l] then label := l
+ null($compilingMap) or (label ^= mapCatchName($mapName)) =>
+ objNew(['THROW,label,wrapped2Quote objVal
+ intCodeGenCOERCE(objNew(code,t1),t2)],t2)
+ -- we have a return statement. just send it back as is
+ objNew(val,t2)
+
+ val is ['PROGN,:code,lastCode] =>
+ objNew(['PROGN,:code,wrapped2Quote objVal
+ intCodeGenCOERCE(objNew(lastCode,t1),t2)],t2)
+
+ val is ['COND,:conds] =>
+ objNew(['COND,
+ :[[p,wrapped2Quote objVal intCodeGenCOERCE(objNew(v,t1),t2)]
+ for [p,v] in conds]],t2)
+
+ -- specially handle subdomain
+ absolutelyCanCoerceByCheating(t1,t2) => objNew(val,t2)
+
+ -- specially handle coerce to Any
+ t2 = '(Any) => objNew(['CONS,MKQ t1,val],t2)
+
+ -- optimize coerces from Any
+ (t1 = '(Any)) and (val is [ ='CONS,t1',val']) =>
+ intCodeGenCOERCE(objNew(val',removeQuote t1'),t2)
+
+ -- specially handle coerce from Equation to Boolean
+ (t1 is ['Equation,:.]) and (t2 = $Boolean) =>
+ coerceByFunction(triple,t2)
+
+ -- next is hack for if-then-elses
+ (t1 = '$NoValueMode) and (val is ['COND,pred]) =>
+ code :=
+ ['COND,pred,
+ [MKQ true,['throwKeyedMsg,MKQ "S2IM0016",MKQ $mapName]]]
+ objNew(code,t2)
+
+ -- optimize coerces to Expression
+ t2 = $OutputForm =>
+ coerceByFunction(triple,t2)
+
+ isSubDomain(t1, $Integer) =>
+ intCodeGenCOERCE(objNew(val, $Integer), t2)
+
+ -- generate code
+ -- 1. See if the coercion will go through (absolutely)
+ -- Must be careful about variables or else things like
+ -- P I --> P[x] P I might not have the x in the original polynomial
+ -- put in the correct place
+
+ (not containsVariables(t2)) and canCoerceByFunction(t1,t2) =>
+ -- try coerceByFunction
+ (not canCoerceByMap(t1,t2)) and
+ (code := coerceByFunction(triple,t2)) => code
+ intCodeGenCoerce1(val,t1,t2)
+
+ -- 2. Set up a failure point otherwise
+
+ intCodeGenCoerce1(val,t1,t2)
+
+intCodeGenCoerce1(val,t1,t2) ==
+ -- Internal function to previous one
+ -- designed to ensure that we don't use coerceOrCroak on mappings
+--(t2 is ['Mapping,:.]) => THROW('coerceOrCroaker, 'croaked)
+ objNew(['coerceOrCroak,mkObjCode(['wrap,val],t1),
+ MKQ t2, MKQ $mapName],t2)
+
+--% Map components
+
+wrapMapBodyWithCatch body ==
+ -- places a CATCH around the map body
+ -- note that we will someday have to fix up the catch identifier
+ -- to use the generated internal map name
+ $mapThrowCount = 0 => body
+ if body is ['failCheck,['coerceOrFail,trip,targ,mapn]]
+ then
+ trip is ['LIST,v,m,e] =>
+ ['failCheck,['coerceOrFail,
+ ['LIST,['CATCH,MKQ mapCatchName $mapName, v],m,e],targ,mapn]]
+ keyedSystemError("S2GE0016",['"wrapMapBodyWithCatch",
+ '"bad CATCH for in function form"])
+ else ['CATCH,MKQ mapCatchName $mapName,body]
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}