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|
-- 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.
import i_-analy
namespace BOOT
--% Constructor Evaluation
$noEvalTypeMsg := nil
evalDomain form ==
if $evalDomain then
sayMSG concat('" instantiating","%b",prefix2String form,"%d")
startTimingProcess 'instantiation
newType? form => form
result := eval mkEvalable form
stopTimingProcess 'instantiation
result
mkEvalable form ==
form is [op,:argl] =>
op="QUOTE" => form
op="WRAPPED" => mkEvalable devaluate argl
op="Record" => mkEvalableRecord form
op="Union" => mkEvalableUnion form
op="Mapping"=> mkEvalableMapping form
op="Enumeration" => form
loadIfNecessary op
kind:= getConstructorKindFromDB op
cosig := getDualSignatureFromDB op =>
[op,:[val for x in argl for typeFlag in rest cosig]] where val() ==
typeFlag =>
kind = "category" => MKQ x
VECP x => MKQ x
loadIfNecessary x
mkEvalable x
x is ['QUOTE,:.] => x
x is ['_#,y] => ['SIZE,MKQ y]
MKQ x
[op,:[mkEvalable x for x in argl]]
form=$EmptyMode => $Integer
IDENTP form and constructor?(form) => [form]
FBPIP form => BPINAME form
form
mkEvalableMapping form ==
[first form,:[mkEvalable d for d in rest form]]
mkEvalableRecord form ==
[first form,:[[":",n,mkEvalable d] for [":",n,d] in rest form]]
mkEvalableUnion form ==
isTaggedUnion form =>
[first form,:[[":",n,mkEvalable d] for [":",n,d] in rest form]]
[first form,:[mkEvalable d for d in rest form]]
evaluateType0 form ==
-- Takes a parsed, unabbreviated type and evaluates it, replacing
-- type valued variables with their values, and calling bottomUp
-- on non-type valued arguemnts to the constructor
-- and finally checking to see whether the type satisfies the
-- conditions of its modemap
-- However, the input might be an attribute, not a type
-- $noEvalTypeMsg: fluid := true
domain:= isDomainValuedVariable form => domain
form = $EmptyMode => form
form = "?" => $EmptyMode
STRINGP form => form
form = "$" => form
$expandSegments : local := nil
form is ['typeOf,.] =>
form' := mkAtree form
bottomUp form'
objVal getValue(form')
form is [op,:argl] =>
op='CATEGORY =>
argl is [x,:sigs] => [op,x,:[evaluateSignature(s) for s in sigs]]
form
op in '(Join Mapping) =>
[op,:[evaluateType arg for arg in argl]]
op='Union =>
argl and first argl is [x,.,.] and member(x,'(_: Declare)) =>
[op,:[['_:,sel,evaluateType type] for ['_:,sel,type] in argl]]
[op,:[evaluateType arg for arg in argl]]
op='Record =>
[op,:[['_:,sel,evaluateType type] for ['_:,sel,type] in argl]]
op='Enumeration => form
constructor? op => evaluateType1 form
NIL
constructor? form =>
ATOM form => evaluateType [form]
throwEvalTypeMsg("S2IE0003",[form,form])
evaluateType form ==
-- Takes a parsed, unabbreviated type and evaluates it, replacing
-- type valued variables with their values, and calling bottomUp
-- on non-type valued arguemnts to the constructor
-- and finally checking to see whether the type satisfies the
-- conditions of its modemap
domain:= isDomainValuedVariable form => domain
form = $EmptyMode => form
form = "?" => $EmptyMode
STRINGP form => form
form = "$" => form
$expandSegments : local := nil
form is ['typeOf,.] =>
form' := mkAtree form
bottomUp form'
objVal getValue(form')
form is [op,:argl] =>
op='CATEGORY =>
argl is [x,:sigs] => [op,x,:[evaluateSignature(s) for s in sigs]]
form
op in '(Join Mapping) =>
[op,:[evaluateType arg for arg in argl]]
op='Union =>
argl and first argl is [x,.,.] and member(x,'(_: Declare)) =>
[op,:[['_:,sel,evaluateType type] for ['_:,sel,type] in argl]]
[op,:[evaluateType arg for arg in argl]]
op='Record =>
[op,:[['_:,sel,evaluateType type] for ['_:,sel,type] in argl]]
op='Enumeration => form
evaluateFormAsType form
constructor? form =>
ATOM form => evaluateType [form]
throwEvalTypeMsg("S2IE0003",[form,form])
evaluateFormAsType form
++ `form' used in a context where a type (domain or category) is
++ expected. Attempt to fully evaluate it. Error if the resulting
++ value is not a type. When successful, the result is the reified
++ canonical form of the type.
evaluateFormAsType form ==
form is [op,:args] and constructor? op => evaluateType1 form
t := mkAtree form
-- ??? Maybe we should be more careful about generalized types.
bottomUp t is [m] and (member(m,$LangSupportTypes) or isCategoryForm(m,$e)) =>
objVal getValue t
throwEvalTypeMsg("S2IE0004",[form])
++ evaluates the arguments passed to the constructor `op'.
++ Note: only constructor instantiations go here.
evaluateType1 (form is [op,:argl]) ==
null (sig := getConstructorSignature op) =>
throwEvalTypeMsg("S2IE0005",[form])
[.,:ml] := sig
ml := replaceSharps(ml,form)
# argl ^= #ml => throwEvalTypeMsg("S2IE0003",[form,form])
for x in argl for m in ml for argnum in 1.. repeat
typeList := [v,:typeList] where v() ==
categoryForm?(m) =>
m := evaluateType MSUBSTQ(x,'_$,m)
evalCategory(x' := (evaluateType x), m) => x'
throwEvalTypeMsg("S2IE0004",[form])
m := evaluateType m
getConstructorKindFromDB opOf m = "domain" and
(tree := mkAtree x) and putTarget(tree,m) and ((bottomUp tree) is [m1]) =>
[zt,:zv]:= z1:= getAndEvalConstructorArgument tree
(v' := coerceOrRetract(z1,m)) => objValUnwrap v'
throwKeyedMsgCannotCoerceWithValue(zv,zt,m)
if x = $EmptyMode then x := $quadSymbol
throwEvalTypeMsg("S2IE0006",[makeOrdinal argnum,m,form])
[op,:nreverse typeList]
throwEvalTypeMsg(msg, args) ==
$noEvalTypeMsg => spadThrow()
throwKeyedMsg(msg, args)
makeOrdinal i ==
('(first second third fourth fifth sixth seventh eighth ninth tenth)).(i-1)
evaluateSignature sig ==
-- calls evaluateType on a signature
sig is [ ='SIGNATURE,fun,sigl] =>
['SIGNATURE,fun,
[(t = '_$ => t; evaluateType(t)) for t in sigl]]
sig
--% Code Evaluation
-- This code generates, then evaluates code during the bottom up phase
-- of interpretation
splitIntoBlocksOf200 a ==
null a => nil
[[first (r:=x) for x in tails a for i in 1..200],
:splitIntoBlocksOf200 rest r]
evalForm(op,opName,argl,mmS) ==
-- applies the first applicable function
for mm in mmS until form repeat
[sig,fun,cond]:= mm
(CAR sig) = 'interpOnly => form := CAR sig
#argl ^= #CDDR sig => 'skip ---> RDJ 6/95
form:=
$genValue or null cond =>
[getArgValue2(x,t,sideEffectedArg?(t,sig,opName),opName) or return NIL
for x in argl for t in CDDR sig]
[getArgValueComp2(x,t,c,sideEffectedArg?(t,sig,opName),opName) or return NIL
for x in argl for t in CDDR sig for c in cond]
form or null argl =>
dc:= CAR sig
form :=
dc='local => --[fun,:form]
atom fun =>
fun in $localVars => ['SPADCALL,:form,fun]
[fun,:form,NIL]
['SPADCALL,:form,fun]
dc is ["__FreeFunction__",:freeFun] =>
['SPADCALL,:form,freeFun]
fun is ['XLAM,xargs,:xbody] =>
rec := first form
xbody is [['RECORDELT,.,ind,len]] =>
optRECORDELT([CAAR xbody,rec,ind,len])
xbody is [['SETRECORDELT,.,ind,len,.]] =>
optSETRECORDELT([CAAR xbody,rec,ind,len,CADDR form])
xbody is [['RECORDCOPY,.,len]] =>
optRECORDCOPY([CAAR xbody,rec,len])
['FUNCALL,['function , ['LAMBDA,xargs,:xbody]],:TAKE(#xargs, form)]
dcVector := evalDomain dc
fun0 :=
newType? CAAR mm =>
mm' := first ncSigTransform mm
ncGetFunction(opName, first mm', rest mm')
NRTcompileEvalForm(opName,fun,dcVector)
null fun0 => throwKeyedMsg("S2IE0008",[opName])
[bpi,:domain] := fun0
EQ(bpi,function Undef) =>
sayKeyedMsg("S2IE0009",[opName,formatSignature CDR sig,CAR sig])
NIL
if $NRTmonitorIfTrue = true then
sayBrightlyNT ['"Applying ",first fun0,'" to:"]
pp [devaluateDeeply x for x in form]
_$:fluid := domain
['SPADCALL, :form, fun0]
not form => nil
-- not form => throwKeyedMsg("S2IE0008",[opName])
form='interpOnly => rewriteMap(op,opName,argl)
targetType := CADR sig
if CONTAINED('_#,targetType) then targetType := NRTtypeHack targetType
evalFormMkValue(op,form,targetType)
sideEffectedArg?(t,sig,opName) ==
opString := SYMBOL_-NAME opName
(opName ^= 'setelt) and (ELT(opString, #opString-1) ^= char '_!) => nil
dc := first sig
t = dc
getArgValue(a, t) ==
atom a and not VECP a =>
t' := coerceOrRetract(getBasicObject a,t)
t' and getValueNormalForm t'
v := getArgValue1(a, t) => v
alt := altTypeOf(objMode getValue a, a, nil) =>
t' := coerceInt(getValue a, alt)
t' := coerceOrRetract(t',t)
t' and getValueNormalForm t'
nil
getArgValue1(a,t) ==
-- creates a value for a, coercing to t
t' := getValue(a) =>
(m := getMode a) and (m is ['Mapping,:ml]) and (m = t) and
objValUnwrap(t') is ['MAP,:.] =>
getMappingArgValue(a,t,m)
t' := coerceOrRetract(t',t)
t' and getValueNormalForm t'
systemErrorHere '"getArgValue"
getArgValue2(a,t,se?,opName) ==
se? and (objMode(getValue a) ^= t) =>
throwKeyedMsg("S2IE0013", [opName, objMode(getValue a), t])
getArgValue(a,t)
getArgValueOrThrow(x, type) ==
getArgValue(x,type) or throwKeyedMsg("S2IC0007",[type])
getMappingArgValue(a,t,m is ['Mapping,:ml]) ==
(una := getUnname a) in $localVars =>
$genValue =>
name := get(una,'name,$env)
a.0 := name
mmS := selectLocalMms(a,name,rest ml, nil)
or/[mm for mm in mmS |
(mm is [[., :ml1],oldName,:.] and ml=ml1)] => MKQ [oldName]
NIL
una
mmS := selectLocalMms(a,una,rest ml, nil)
or/[mm for mm in mmS |
(mm is [[., :ml1],oldName,:.] and ml=ml1)] => MKQ [oldName]
NIL
getArgValueComp2(arg, type, cond, se?, opName) ==
se? and (objMode(getValue arg) ^= type) =>
throwKeyedMsg("S2IE0013", [opName, objMode(getValue arg), type])
getArgValueComp(arg, type, cond)
getArgValueComp(arg,type,cond) ==
-- getArgValue for compiled case. if there is a condition then
-- v must be data to verify that coerceInteractive succeeds.
v:= getArgValue(arg,type)
null v => nil
null cond => v
v is ['QUOTE,:.] or getBasicMode v => v
n := getUnnameIfCan arg
if num := isSharpVarWithNum n then
not $compilingMap => n := 'unknownVar
alias := get($mapName,'alias,$e)
n := alias.(num - 1)
keyedMsgCompFailure("S2IE0010",[n])
evalFormMkValue(op,form,tm) ==
val:=
u:=
$genValue => wrap timedEVALFUN form
form
objNew(u,tm)
--+
if $NRTmonitorIfTrue = true then
sayBrightlyNT ['"Value of ",op.0,'" ===> "]
pp unwrap u
putValue(op,val)
[tm]
failCheck x ==
x = '"failed" =>
stopTimingProcess peekTimedName()
THROW('interpreter,objNewWrap('"failed",$String))
x = $coerceFailure =>
NIL
x
--% Some Antique Comments About the Interpreter
--EVAL BOOT contains the top level interface to the Scratchhpad-II
--interpreter. The Entry point into the interpreter from the parser is
--processInteractive.
--The type analysis algorithm is contained in the file BOTMUP BOOT,
--and MODSEL boot,
--the map handling routines are in MAP BOOT and NEWMAP BOOT, and
--the interactive coerce routines are in COERCE BOOT and COERCEFN BOOT.
--
--Conventions:
-- All spad values in the interpreter are passed around in triples.
-- These are lists of three items: [value,mode,environment]. The value
-- may be wrapped (this is a pair whose CAR is the atom WRAPPED and
-- whose CDR is the value), which indicates that it is a real value,
-- or unwrapped in which case it needs to be EVALed to produce the
-- proper value. The mode is the type of value, and should always be
-- completely specified (not contain $EmptyMode). The environment
-- is always empty, and is included for historical reasons.
--
--Modemaps:
-- Modemaps are descriptions of compiled Spad function which the
-- interpreter uses to perform type analysis. They consist of patterns
-- of types for the arguments, and conditions the types must satisfy
-- for the function to apply. For each function name there is a list
-- of modemaps in file MODEMAP DATABASE for each distinct function with
-- that name. The following is the list of the modemaps for "*"
-- (multiplication. The first modemap (the one with the labels) is for
-- module mltiplication which is multiplication of an element of a
-- module by a member of its scalar domain.
--
-- This is the signature pattern for the modemap, it is of the form:
-- (DomainOfComputation TargetType <ArgumentType ...>)
-- |
-- | This is the predicate that needs to be
-- | satisfied for the modemap to apply
-- | |
-- V |
-- /-----------/ |
-- ( ( (*1 *1 *2 *1) V
-- /-----------------------------------------------------------/
-- ( (AND (ofCategory *1 (Module *2)) (ofCategory *2 (SimpleRing))) )
-- . CATDEF) <-- This is the file where the function was defined
-- ( (*1 *1 *2 *1)
-- ( (AND (isDomain *2 (Integer)) (ofCategory *1 (AbelianGroup))) )
-- . CATDEF)
-- ( (*1 *1 *2 *1)
-- ( (AND
-- (isDomain *2 (NonNegativeInteger))
-- (ofCategory *1 (AbelianMonoid))) )
-- . CATDEF)
-- ((*1 *1 *1 *1) ((ofCategory *1 (SemiGroup)) ) . CATDEF)
-- )
--
--Environments:
-- Environments associate properties with atoms.
-- (see CUTIL BOOT for the exact structure of environments).
-- Some common properties are:
-- modeSet:
-- During interpretation we build a modeSet property for each node in
-- the expression. This is (in theory) a list of all the types
-- possible for the node. In the current implementation these
-- modeSets always contain a single type.
-- value:
-- Value properties are always triples. This is where the values of
-- variables are stored. We also build value properties for internal
-- nodes during the bottom up phase.
-- mode:
-- This is the declared type of an identifier.
--
-- There are several different environments used in the interpreter:
-- $InteractiveFrame : this is the environment where the user
-- values are stored. Any side effects of evaluation of a top-level
-- expression are stored in this environment. It is always used as
-- the starting environment for interpretation.
-- $e : This is the name used for $InteractiveFrame while interpreting.
-- $env : This is local environment used by the interpreter.
-- Only temporary information (such as types of local variables is
-- stored in $env.
-- It is thrown away after evaluation of each expression.
--
--Frequently used global variables:
-- $genValue : if true then evaluate generated code, otherwise leave
-- code unevaluated. If $genValue is false then we are compiling.
-- $op: name of the top level operator (unused except in map printing)
-- $mapList: list of maps being type analyzed, used in recursive
-- map type anlysis.
-- $compilingMap: true when compiling a map, used to detect where to
-- THROW when interpret-only is invoked
-- $compilingLoop: true when compiling a loop body, used to control
-- nesting level of interp-only loop CATCH points
-- $interpOnly: true when in interpret only mode, used to call
-- alternate forms of COLLECT and REPEAT.
-- $inCOLLECT: true when compiling a COLLECT, used only for hacked
-- stream compiler.
-- $StreamFrame: used in printing streams, it is the environment
-- where local stream variables are stored
-- $declaredMode: Weak type propagation for symbols, set in upCOERCE
-- and upLET. This variable is used to determine
-- the alternate polynomial types of Symbols.
-- $localVars: list of local variables in a map body
-- $MapArgumentTypeList: hack for stream compilation
|