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|
-- Copyright (c) 1991-2002, The Numerical Algorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2011, Gabriel Dos Reis.
-- 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_-object
namespace BOOT
--% User Function Creation and Analysis Code
$mapTarget := nil
$mapReturnTypes := nil
$mapName := 'noMapName
$mapThrowCount := 0 -- times a "return" occurs in map
$insideCompileBodyIfTrue := false
--% Generating internal names for functions
$specialMapNameSuffix := nil
makeInternalMapName(userName,numArgs,numMms,extraPart) ==
name := strconc('"*",STRINGIMAGE numArgs,'";",
object2String userName,'";",STRINGIMAGE numMms,'";",
object2String frameName first $interpreterFrameRing )
if extraPart then name := strconc(name,'";",extraPart)
if $specialMapNameSuffix then
name := strconc(name,'";",$specialMapNameSuffix)
makeSymbol name
isInternalMapName name ==
-- this only returns true or false as a "best guess"
(not ident?(name)) or (name = "*") or (name = "**") => false
sz := # (name' := symbolName name)
(sz < 7) or (char "*" ~= name'.0) => false
not digit? name'.1 => false
null STRPOS('"_;",name',1,nil) => false
-- good enough
true
makeInternalMapMinivectorName(name) ==
string? name =>
makeSymbol strconc(name,'";MV")
makeSymbol strconc(symbolName name,'";MV")
--% Adding a function definition
isMapExpr x == x is ["%Map",:.]
isMap x ==
y := get(x,'value,$InteractiveFrame) =>
objVal y is ["%Map",:.] => x
addDefMap(['DEF,lhs,mapsig,.,rhs],pred) ==
-- Create a new map, add to an existing one, or define a variable
-- compute the dependencies for a map
-- next check is for bad forms on the lhs of the ==, such as
-- numbers, constants.
-- FIXME: this function miguidedly characterizes constant definitions
-- as rules definitions. In particular, typed constant definitions
-- are characterized are rules in one part, and announced to user
-- a niladic functions. We try to limit the damage as much as we can.
defineeIsConstant := false
if atom lhs then
op := lhs
putHist(op,'isInterpreterRule,true,$e)
putHist(op,'isInterpreterFunction,false,$e)
defineeIsConstant := true
lhs := [lhs]
else
-- this is a function definition. If it has been declared
-- previously, make sure it is Mapping.
op := first lhs
(oldMode := get(op,'mode,$e)) and oldMode isnt ['Mapping,:.] =>
throwKeyedMsg("S2IM0001",[op,oldMode])
putHist(op,'isInterpreterRule,false,$e)
putHist(op,'isInterpreterFunction,true,$e)
(integer?(op) or op in '(true false nil % %%)) =>
throwKeyedMsg("S2IM0002",[lhs])
-- verify a constructor abbreviation is not used on the lhs
op ~= (op' := unabbrev op) => throwKeyedMsg("S2IM0003",[op,op'])
-- get the formal parameters. These should only be atomic symbols
-- that are not numbers.
parameters := [p for p in rest lhs | ident?(p)]
-- see if a signature has been given. if anything in mapsig is nil,
-- then declaration was omitted.
someDecs := nil
allDecs := true
mapmode := ['Mapping]
$env:local := [[nil]]
$eval:local := true --generate code-- don't just type analyze
$genValue:local := true --evaluate all generated code
for d in mapsig repeat
if d then
someDecs := true
d' := evaluateType unabbrev d
isPartialMode d' => throwKeyedMsg("S2IM0004",nil)
-- tree := mkAtree d'
-- null (d' := isType tree) => throwKeyedMsg("S2IM0005",[d])
mapmode := [d',:mapmode]
else allDecs := false
if allDecs then
mapmode := reverse! mapmode
putHist(op,'mode,mapmode,$e)
if not defineeIsConstant then
sayKeyedMsg("S2IM0006",[formatOpSignature(op,rest mapmode)])
else if someDecs then throwKeyedMsg("S2IM0007",[op])
-- if map is declared, check that signature arg count is the
-- same as what is given.
if get(op,'mode,$e) is ['Mapping,.,:mapargs] then
rhs is ["rules",:.] =>
0 ~= (numargs := # rest lhs) =>
throwKeyedMsg("S2IM0027",[numargs,op])
# rest lhs ~= # mapargs => throwKeyedMsg("S2IM0008",[op])
--get all the user variables in the map definition. This is a multi
--step process as this should not include recursive calls to the map
--itself, or the formal parameters
userVariables1 := getUserIdentifiersIn rhs
$freeVars: local := nil
$localVars: local := nil
for parm in parameters repeat mkLocalVar($mapName,parm)
userVariables2 := setDifference(userVariables1,findLocalVars(op,rhs))
userVariables3 := setDifference(userVariables2, parameters)
userVariables4 := removeDuplicates setDifference (userVariables3, [op])
--figure out the new dependencies for the new map (what it depends on)
newDependencies := makeNewDependencies (op, userVariables4)
putDependencies (op, newDependencies)
clearDependencies(op,'T)
addMap(lhs,rhs,pred)
addMap(lhs,rhs,pred) ==
[op,:argl] := lhs
$sl: local:= nil
predList := nil
formalArgList:= [mkFormalArg(makeArgumentIntoNumber x,s)
for x in argl for s in $FormalMapVariableList]
argList:=
[fn for x in formalArgList] where
fn() ==
if x is ["SUCHTHAT",s,p] then (predList:= [p,:predList]; x:= s)
x
mkMapAlias(op,argl)
argPredList:= reverse! predList
finalPred :=
-- handle g(a,T)==a+T confusion between pred=T and T variable
MKPF((pred and (pred ~= 'T) => [:argPredList,applySubstNQ($sl,pred)]; argPredList),"and")
body:= applySubstNQ($sl,rhs)
oldMap :=
(obj := get(op,'value,$InteractiveFrame)) => objVal obj
nil
newMap := augmentMap(op,argList,finalPred,body,oldMap)
null newMap =>
sayRemoveFunctionOrValue op
putHist(op,'alias,nil,$e)
$ClearBodyToken --- see return from addDefMap in tree2Atree1
if get(op,'isInterpreterRule,$e) then type := ['RuleCalled,op]
else type := ['FunctionCalled,op]
recursive :=
depthOfRecursion(op,newMap) = 0 => false
true
putHist(op,'recursive,recursive,$e)
objNew(newMap,type)
augmentMap(op,args,pred,body,oldMap) ==
pattern:= makePattern(args,pred)
newMap:=deleteMap(op,pattern,oldMap)
body = $ClearBodyToken =>
if newMap=oldMap then
sayMSG ['" Cannot find part of",:bright op,'"to delete."]
newMap --just delete rule if body is $ClearBodyToken
entry:= [pattern,:body]
resultMap:=
newMap is ["%Map",:tail] => ["%Map",:tail,entry]
["%Map",entry]
resultMap
deleteMap(op,pattern,map) ==
map is ["%Map",:tail] =>
newMap:= ["%Map",:[x for x in tail | w]] where w() ==
x is [=pattern,:replacement] => sayDroppingFunctions(op,[x])
true
null rest newMap => nil
newMap
nil
getUserIdentifiersIn body ==
null body => nil
ident? body =>
isSharpVarWithNum body => nil
body = $ClearBodyToken => nil
[body]
body is ["WRAPPED",:.] => nil
body is [op,:itl,body1] and op in '(COLLECT REPEAT %collect) =>
userIds :=
S_+(getUserIdentifiersInIterators itl,getUserIdentifiersIn body1)
S_-(userIds,getIteratorIds itl)
body is ['%loop,:itl,val,body1] =>
userIds :=
S_+(getUserIdentifiersInIterators itl,getUserIdentifiersIn body1)
userIds := S_+(getUserIdentifiersIn val,userIds)
S_-(userIds,getIteratorIds itl)
body is [op,:l] =>
argIdList :=
-- field tags do not contribute to dependencies.
op = "Record" or (op = "Union" and l is [[":",.,.],:.]) =>
append/[getUserIdentifiersIn y for [.,.,y] in l]
"append"/[getUserIdentifiersIn y for y in l]
bodyIdList :=
cons? op or not (GETL(op,'Nud) or GETL(op,'Led) or GETL(op,'up))=>
append!(getUserIdentifiersIn op, argIdList)
argIdList
removeDuplicates bodyIdList
getUserIdentifiersInIterators itl ==
for x in itl repeat
x is ["STEP",i,:l] =>
varList:= [:"append"/[getUserIdentifiersIn y for y in l],:varList]
x is ["IN",.,y] => varList:= [:getUserIdentifiersIn y,:varList]
x is ["ON",.,y] => varList:= [:getUserIdentifiersIn y,:varList]
x is ['%init,.,y] => varList:= [:getUserIdentifiersIn y,:varList]
x is [op,a] and op in '(_| WHILE UNTIL) =>
varList:= [:getUserIdentifiersIn a,:varList]
keyedSystemError("S2GE0016",['"getUserIdentifiersInIterators",
'"unknown iterator construct"])
removeDuplicates varList
getIteratorIds itl ==
varList := nil
for x in itl repeat
x is ["STEP",i,:.] => varList := [i,:varList]
x is ["IN",y,:.] => varList := [y,:varList]
x is ["ON",y,:.] => varList := [y,:varList]
x is ['%init,y,:.] => varList := [y,:varList]
nil
varList
makeArgumentIntoNumber x ==
x=$Zero => 0
x=$One => 1
atom x => x
x is ["-",n] and integer? n => -n
[removeZeroOne first x,:removeZeroOne rest x]
mkMapAlias(op,argl) ==
u:= mkAliasList argl
newAlias :=
alias:= get(op,"alias",$e) => [(y => y; x) for x in alias for y in u]
u
$e:= putHist(op,"alias",newAlias,$e)
mkAliasList l == fn(l,nil) where fn(l,acc) ==
null l => reverse! acc
not symbol? first l or symbolMember?(first l,acc) => fn(rest l,[nil,:acc])
fn(rest l,[first l,:acc])
args2Tuple args ==
args is [first,:rest] =>
null rest => first
["tuple",:args]
nil
makePattern(args,pred) ==
nargs:= #args
nargs = 1 =>
pred is ["=","#1",n] => n
addPatternPred("#1",pred)
u:= canMakeTuple(nargs,pred) => u
addPatternPred(["tuple",:TAKE(nargs,$FormalMapVariableList)],pred)
addPatternPred(arg,pred) ==
pred=true => arg
["|",arg,pred]
canMakeTuple(nargs,pred) ==
pred is ["and",:l] and nargs=#l and
(u:= [(x is ["=",=y,a] => a; return nil)
for y in $FormalMapVariableList for x in orderList l]) =>
["tuple",:u]
sayRemoveFunctionOrValue x ==
(obj := getValue x) and (md := objMode obj) =>
md = $EmptyMode =>
sayMessage ['" ",:bright x,'"now has no function parts."]
sayMessage ['" value for",:bright x,'"has been removed."]
sayMessage ['" ",:bright x,'"has no value so this does nothing."]
sayDroppingFunctions(op,l) ==
sayKeyedMsg("S2IM0017",[#l,op])
if $displayDroppedMap then
for [pattern,:replacement] in l repeat
displaySingleRule(op,pattern,replacement)
nil
makeRuleForm(op,pattern)==
pattern is ["tuple",:l] => [op,:l]
[op,:pattern]
mkFormalArg(x,s) ==
isConstantArgument x => ["SUCHTHAT",s,["=",s,x]]
isPatternArgument x => ["SUCHTHAT",s,["is",s,x]]
ident? x =>
y:= LASSOC(x,$sl) => ["SUCHTHAT",s,["=",s,y]]
$sl:= [[x,:s],:$sl]
s
['SUCHTHAT,s,["=",s,x]]
isConstantArgument x ==
integer? x => x
x is ["QUOTE",.] => x
isPatternArgument x == x is ["construct",:.]
--% Map dependencies
makeNewDependencies (op, userVariables) ==
null userVariables => nil
--add the new dependencies
[[(first userVariables),op],
:makeNewDependencies (op, rest userVariables)]
putDependencies (op, dependencies) ==
oldDependencies := getFlag "$dependencies"
--remove the obsolete dependencies: all those that applied to the
--old definition, but may not apply here. If they do, they'll be
--in the list of new dependencies anyway
oldDependencies := removeObsoleteDependencies (op, oldDependencies) where
removeObsoleteDependencies (op, oldDep) ==
null oldDep => nil
op = rest first oldDep =>
removeObsoleteDependencies (op, rest oldDep)
[first oldDep,:removeObsoleteDependencies (op, rest oldDep)]
--Create the list of dependencies to output. This will be all the
--old dependencies that are still applicable, and all the new ones
--that have just been generated. Remember that the list of
--dependencies does not just include those for the map just being
--defined, but includes those for all maps and variables that exist
newDependencies := union (dependencies, oldDependencies)
putFlag ("$dependencies", newDependencies)
clearDependencies(x,clearLocalModemapsIfTrue) ==
$dependencies: local:= COPY getFlag "$dependencies"
clearDep1(x,nil,nil,$dependencies)
clearDep1(x,toDoList,doneList,depList) ==
symbolMember?(x,doneList) => nil
clearCache x
newDone:= [x,:doneList]
until null a repeat
a:= ASSQ(x,depList)
a =>
depList := remove(depList,a)
toDoList := union(toDoList,
setDifference(rest a,doneList))
toDoList is [a,:res] => clearDep1(a,res,newDone,depList)
'done
--% Formatting and displaying maps
displayRule(op,rule) ==
null rule => nil
mathprint ["CONCAT","Definition: ", rule]
nil
outputFormat(x,m) ==
-- this is largely junk and is being phased out
ident? m => x
m=$OutputForm or m=$EmptyMode => x
categoryForm?(m) => x
isMapExpr x => x
containsVars x => x
atom(x) and first(m) = 'List => x
(x is ['construct,:.]) and m = '(List (Expression)) => x
T:= coerceInteractive(objNewWrap(x,maximalSuperType(m)),
$OutputForm) or return x
objValUnwrap T
displaySingleRule($op,pattern,replacement) ==
mathprint ["%Map",[pattern,:replacement]]
displayMap(headingIfTrue,$op,map) ==
mathprint
headingIfTrue => ['CONCAT,PNAME "value: ",map]
map
simplifyMapPattern (x,alias) ==
for a in alias
for m in $FormalMapVariableList | a and not CONTAINED(a,x) repeat
x:= substitute(a,m,x)
[lhs,:rhs]:= x
rhs := simplifyMapConstructorRefs rhs
x := [lhs,:rhs]
lhs is ["|",y,pred] =>
pred:= predTran pred
sl:= getEqualSublis pred =>
y' := applySubst(sl,y)
pred:= unTrivialize applySubst(sl,pred) where unTrivialize x ==
x is [op,:l] and op in '(and or) =>
MKPF([unTrivialize y for y in l],op)
x is [op,a,=a] and op in '(_= is)=> true
x
rhs':= applySubst(sl,rhs)
pred=true => [y',:rhs']
[["PAREN",["|",y',pred]],:rhs']
pred=true => [y,:rhs]
[["PAREN",["|",y,pred]],:rhs]
lhs=true => ["true",:rhs]
x
simplifyMapConstructorRefs form ==
-- try to linear format constructor names
atom form => form
[op,:args] := form
op in '(exit SEQ) =>
[op,:[simplifyMapConstructorRefs a for a in args]]
op in '(REPEAT) =>
[op,first args,:[simplifyMapConstructorRefs a for a in rest args]]
op in '(_: _:_: _@) =>
args is [obj,dom] =>
dom' := prefix2String dom
--if atom dom' then dom' := [dom']
--[op,obj,apply(function strconc,dom')]
dom'' :=
atom dom' => dom'
null rest dom' => first dom'
apply(function strconc, dom')
[op,obj, dom'']
form
form
predTran x ==
x is ["IF",a,b,c] =>
c = "false" => MKPF([predTran a,predTran b],"and")
b = "true" => MKPF([predTran a,predTran c],"or")
b = "false" and c = "true" => ["not",predTran a]
x
x
getEqualSublis pred == fn(pred,nil) where fn(x,sl) ==
(x:= applySubst(sl,x)) is [op,:l] and op in '(and or) =>
for y in l repeat sl:= fn(y,sl)
sl
x is ["is",a,b] => [[a,:b],:sl]
x is ["=",a,b] =>
ident? a and not CONTAINED(a,b) => [[a,:b],:sl]
ident? b and not CONTAINED(b,a) => [[b,:a],:sl]
sl
sl
--% User function analysis
mapCatchName mapname ==
makeSymbol strconc('"$",STRINGIMAGE mapname,'"CatchMapIdentifier$")
analyzeMap(op,argTypes,mapDef, tar) ==
-- Top level enty point for map type analysis. Sets up catch point
-- for interpret-code mode.
$compilingMap:local := true
$definingMap:local := true
$minivector : local := nil -- later becomes value of $minivectorName
$mapThrowCount : local := 0 -- number of "return"s encountered
$mapReturnTypes : local := nil -- list of types from returns
$repeatLabel : local := nil -- for loops; see upREPEAT
$breakCount : local := 0 -- breaks from loops; ditto
$mapTarget : local := tar
$interpOnly: local := nil
$mapName : local := op.0
if get($mapName,'recursive,$e) then
argTypes := [f t for t in argTypes] where
f x ==
isEqualOrSubDomain(x,$Integer) => $Integer
x
mapAndArgTypes := [$mapName,:argTypes]
member(mapAndArgTypes,$analyzingMapList) =>
-- if the map is declared, return the target type
(getMode op) is ['Mapping,target,:.] => target
throwKeyedMsg("S2IM0009",
[$mapName,['" ", map for [map,:.] in $analyzingMapList]])
PUSH(mapAndArgTypes,$analyzingMapList)
mapDef := mapDefsWithCorrectArgCount(#argTypes, mapDef)
null mapDef => (POP $analyzingMapList; nil)
UNWIND_-PROTECT(x:=CATCH('mapCompiler,analyzeMap0(op,argTypes,mapDef)),
POP $analyzingMapList)
x='tryInterpOnly =>
opName:=getUnname op
fun := mkInterpFun(op,opName,argTypes)
if getMode op isnt ['Mapping,:sig] then
sig := [nil,:[nil for type in argTypes]]
$e:=putHist(opName,'localModemap,
[[['interpOnly,:sig],fun,nil]],$e)
x
analyzeMap0(op,argTypes,mapDef) ==
-- Type analyze and compile a map. Returns the target type of the map.
-- only called if there is no applicable compiled map
$MapArgumentTypeList:local:= argTypes
numMapArgs mapDef ~= #argTypes => nil
((m:=getMode op) is ['Mapping,:sig]) or (m and (sig:=[m])) =>
-- op has mapping property only if user has declared the signature
analyzeDeclaredMap(op,argTypes,sig,mapDef,$mapList)
analyzeUndeclaredMap(getUnname op,argTypes,mapDef,$mapList)
compFailure msg ==
-- Called when compilation fails in such a way that interpret-code
-- mode might be of some use.
not $useCoerceOrCroak => THROW('coerceOrCroaker, 'croaked)
if $reportInterpOnly then
sayMSG msg
sayMSG '" We will attempt to interpret the code."
null $compilingMap => THROW('loopCompiler,'tryInterpOnly)
THROW('mapCompiler,'tryInterpOnly)
mkInterpFun(op,opName,argTypes) ==
-- creates a function form to put in fun slot of interp-only
-- local modemaps
getMode op isnt ['Mapping,:sig] => nil
parms := [var for type in argTypes for var in $FormalMapVariableList]
arglCode := ['LIST,:[argCode for type in argTypes
for argName in parms]] where argCode() ==
['putValueValue,['mkAtreeNode,MKQ argName],
objNewCode(['wrap,argName],type)]
funName := gensym()
body:=['rewriteMap1,MKQ opName,arglCode,MKQ sig]
putMapCode(opName,body,sig,funName,parms,false)
genMapCode(opName,body,sig,funName,parms,false)
funName
rewriteMap(op,opName,argl) ==
-- interpret-code handler for maps. Recursively calls the interpreter
-- on the body of the map.
not $genValue =>
get(opName,'mode,$e) isnt ['Mapping,:sig] =>
compFailure ['" Cannot compile map:",:bright opName]
arglCode := ['LIST,:[argCode for arg in argl for argName in
$FormalMapVariableList]] where argCode() ==
['putValueValue,['mkAtreeNode,MKQ argName],
objNewCode(['wrap,getValueNormalForm getValue arg],
getMode arg)]
putValue(op,objNew(['rewriteMap1,MKQ opName,arglCode,MKQ sig],
first sig))
putModeSet(op,[first sig])
rewriteMap0(op,opName,argl)
putBodyInEnv(opName, numArgs) ==
val := get(opName, 'value, $e)
val is [.,"%Map", :bod] =>
$e := putHist(opName, 'mapBody, combineMapParts
mapDefsWithCorrectArgCount(numArgs, bod), $e)
'failed
removeBodyFromEnv(opName) ==
$e := putHist(opName, 'mapBody, nil, $e)
rewriteMap0(op,opName,argl) ==
-- $genValue case of map rewriting
putBodyInEnv(opName, #argl)
if (s := get(opName,'mode,$e)) then
tar := second s
argTypes := CDDR s
else
tar:= nil
argTypes:= nil
get(opName,'mode,$e) is ['Mapping,tar,:argTypes]
$env: local := [[nil]]
for arg in argl
for var in $FormalMapVariableList repeat
if argTypes then
t := first argTypes
argTypes:= rest argTypes
val :=
t is ['Mapping,:.] => getValue arg
coerceInteractive(getValue arg,t)
else
val:= getValue arg
$env:=put(var,'value,val,$env)
if vector? arg then $env := put(var,'name,getUnname arg,$env)
(m := getMode arg) => $env := put(var,'mode,m,$env)
null (val:= interpMap(opName,tar)) =>
throwKeyedMsg("S2IM0010",[opName])
putValue(op,val)
removeBodyFromEnv(opName)
ms := putModeSet(op,[objMode val])
rewriteMap1(opName,argl,sig) ==
-- compiled case of map rewriting
putBodyInEnv(opName, #argl)
if sig then
tar:= first sig
argTypes:= rest sig
else
tar:= nil
argTypes:= nil
evArgl := nil
for arg in reverse argl repeat
v := getValue arg
evArgl := [objNew(objVal v, objMode v),:evArgl]
$env : local := [[nil]]
for arg in argl for evArg in evArgl
for var in $FormalMapVariableList repeat
if argTypes then
t:=first argTypes
argTypes:= rest argTypes
val :=
t is ['Mapping,:.] => evArg
coerceInteractive(evArg,t)
else
val:= evArg
$env:=put(var,'value,val,$env)
if vector? arg then $env := put(var,'name,getUnname arg,$env)
(m := getMode arg) => $env := put(var,'mode,m,$env)
val:= interpMap(opName,tar)
removeBodyFromEnv(opName)
objValUnwrap(val)
interpMap(opName,tar) ==
-- call the interpreter recursively on map body
$genValue : local:= true
$interpMapTag : local := nil
$interpOnly : local := true
$localVars : local := nil
for lvar in get(opName,'localVars,$e) repeat mkLocalVar(opName,lvar)
$mapName : local := opName
$mapTarget : local := tar
body:= get(opName,'mapBody,$e)
savedTimerStack := COPY $timedNameStack
catchName := mapCatchName $mapName
c := CATCH(catchName, interpret1(body,tar,nil))
-- $interpMapTag and $interpMapTag ~= mapCatchName $mapName =>
-- THROW($interpMapTag,c)
while savedTimerStack ~= $timedNameStack repeat
stopTimingProcess peekTimedName()
c -- better be a triple
analyzeDeclaredMap(op,argTypes,sig,mapDef,$mapList) ==
-- analyzes and compiles maps with declared signatures. argTypes
-- is a list of types of the arguments, sig is the declared signature
-- mapDef is the stored form of the map body.
opName := getUnname op
$mapList:=[opName,:$mapList]
$mapTarget := first sig
(mmS:= get(opName,'localModemap,$e)) and
(mm:= or/[mm for (mm:=[[.,:mmSig],:.]) in mmS | mmSig=sig]) =>
compileCoerceMap(opName,argTypes,mm)
-- The declared map needs to be compiled
compileDeclaredMap(opName,sig,mapDef)
argTypes ~= rest sig =>
analyzeDeclaredMap(op,argTypes,sig,mapDef,$mapList)
first sig
compileDeclaredMap(op,sig,mapDef) ==
-- Type analyzes and compiles a map with a declared signature.
-- creates a local modemap and puts it into the environment
$localVars: local := nil
$freeVars: local := nil
$env: local:= [[nil]]
parms:=[var for var in $FormalMapVariableList for m in rest sig]
for m in rest sig for var in parms repeat
$env:= put(var,'mode,m,$env)
body:= getMapBody(op,mapDef)
for lvar in parms repeat mkLocalVar($mapName,lvar)
for lvar in getLocalVars(op,body) repeat mkLocalVar($mapName,lvar)
name := makeLocalModemap(op,sig)
val := compileBody(body,first sig)
isRecursive := (depthOfRecursion(op,body) > 0)
putMapCode(op,objVal val,sig,name,parms,isRecursive)
genMapCode(op,objVal val,sig,name,parms,isRecursive)
first sig
putMapCode(op,code,sig,name,parms,isRecursive) ==
-- saves the generated code and some other information about the
-- function
codeInfo := vector [op,code,sig,name,parms,isRecursive]
allCode := [codeInfo,:get(op,'generatedCode,$e)]
$e := putHist(op,'generatedCode,allCode,$e)
op
makeLocalModemap(op,sig) ==
-- create a local modemap for op with sig, and put it into $e
if (currentMms := get(op,'localModemap,$e)) then
untraceMapSubNames [CADAR currentMms]
newName := makeInternalMapName(op,#sig-1,1+#currentMms,nil)
newMm := [['local,:sig],newName,nil]
mms := [newMm,:currentMms]
$e := putHist(op,'localModemap,mms,$e)
newName
genMapCode(op,body,sig,fnName,parms,isRecursive) ==
-- calls the lisp compiler on the body of a map
if lmm:= get(op,'localModemap,$InteractiveFrame) then
untraceMapSubNames [CADAR lmm]
op0 :=
( n := isSharpVarWithNum op ) => strconc('"<argument ",object2String n,'">")
op
if $verbose then
if get(op,'isInterpreterRule,$e) then
sayKeyedMsg("S2IM0014",[op0,(cons? sig =>prefix2String first sig;'"?")])
else sayKeyedMsg("S2IM0015",[op0,formatSignature sig])
$whereCacheList := [op,:$whereCacheList]
-- RSS: 6-21-94
-- The following code ensures that local variables really are local
-- to a function. We will unnecessarily generate preliminary %LETs for
-- loop variables and variables that do have %LET expressions, but that
-- can be finessed later.
locals := setDifference($localVars,parms)
if locals then
lets := [["%LET", l, ''UNINITIALIZED__VARIABLE, op] for l in locals]
body := ['PROGN, :lets, body]
reportFunctionCompilation(op,fnName,parms,
wrapMapBodyWithCatch flattenCOND body,isRecursive)
compileBody(body,target) ==
-- recursively calls the interpreter on the map body
-- returns a triple with the LISP code for body in the value cell
$insideCompileBodyIfTrue: local := true
$genValue: local := false
$declaredMode:local := target
$eval:local:= true
r := interpret1(body,target,nil)
compileCoerceMap(op,argTypes,mm) ==
-- compiles call to user-declared map where the arguments need
-- to be coerced. mm is the modemap for the declared map.
$insideCompileBodyIfTrue: local := true
$genValue: local := false
[[.,:sig],imp,.]:= mm
parms:= [var for var in $FormalMapVariableList for t in rest sig]
name:= makeLocalModemap(op,[first sig,:argTypes])
argCode := [objVal(coerceInteractive(objNew(arg,t1),t2) or
throwKeyedMsg("S2IC0001",[arg,$mapName,t1,t2]))
for t1 in argTypes for t2 in sig.source for arg in parms]
$insideCompileBodyIfTrue := false
parms:= [:parms,'envArg]
body := ['SPADCALL,:argCode,['LIST,['function,imp]]]
minivectorName := makeInternalMapMinivectorName name
body := substitute(["%dynval",MKQ minivectorName],"$$$",body)
symbolValue(minivectorName) := LIST2VEC $minivector
compileInteractive [name,['LAMBDA,parms,body]]
sig.target
depthOfRecursion(opName,body) ==
-- returns the "depth" of recursive calls of opName in body
mapRecurDepth(opName,nil,body)
mapRecurDepth(opName,opList,body) ==
-- walks over the map body counting depth of recursive calls
-- expanding the bodies of maps called in body
atom body => 0
body is [op,:argl] =>
argc:=
atom argl => 0
argl => "MAX"/[mapRecurDepth(opName,opList,x) for x in argl]
0
symbolMember?(op,opList) => argc
op=opName => 1 + argc
(obj := get(op,'value,$e)) and objVal obj is ["%Map",:mapDef] =>
mapRecurDepth(opName,[op,:opList],getMapBody(op,mapDef))
+ argc
argc
keyedSystemError("S2GE0016",['"mapRecurDepth",
'"unknown function form"])
analyzeUndeclaredMap(op,argTypes,mapDef,$mapList) ==
-- Computes the signature of the map named op, and compiles the body
$freeVars: local := nil
$localVars: local := nil
$env: local:= [[nil]]
$mapList := [op,:$mapList]
parms:=[var for var in $FormalMapVariableList for m in argTypes]
for m in argTypes for var in parms repeat
put(var,'autoDeclare,'T,$env)
put(var,'mode,m,$env)
body:= getMapBody(op,mapDef)
for lvar in parms repeat mkLocalVar($mapName,lvar)
for lvar in getLocalVars(op,body) repeat mkLocalVar($mapName,lvar)
(n:= depthOfRecursion(op,body)) = 0 =>
analyzeNonRecursiveMap(op,argTypes,body,parms)
analyzeRecursiveMap(op,argTypes,body,parms,n)
analyzeNonRecursiveMap(op,argTypes,body,parms) ==
-- analyze and compile a non-recursive map definition
T := compileBody(body,$mapTarget)
if $mapThrowCount > 0 then
t := objMode T
b := and/[(t = rt) for rt in $mapReturnTypes]
not b =>
t := resolveTypeListAny [t,:$mapReturnTypes]
if not $mapTarget then $mapTarget := t
T := compileBody(body,$mapTarget)
sig := [objMode T,:argTypes]
name:= makeLocalModemap(op,sig)
putMapCode(op,objVal T,sig,name,parms,false)
genMapCode(op,objVal T,sig,name,parms,false)
objMode(T)
analyzeRecursiveMap(op,argTypes,body,parms,n) ==
-- analyze and compile a non-recursive map definition
-- makes guess at signature by analyzing non-recursive part of body
-- then re-analyzes the entire body until the signature doesn't change
localMapInfo := saveDependentMapInfo(op, rest $mapList)
tar := CATCH('interpreter,analyzeNonRecur(op,body,$localVars))
for i in 0..n until not sigChanged repeat
sigChanged:= false
name := makeLocalModemap(op,sig:=[tar,:argTypes])
code := compileBody(body,$mapTarget)
objMode(code) ~= tar =>
sigChanged:= true
tar := objMode(code)
restoreDependentMapInfo(op, rest $mapList, localMapInfo)
sigChanged => throwKeyedMsg("S2IM0011",[op])
putMapCode(op,objVal code,sig,name,parms,true)
genMapCode(op,objVal code,sig,name,parms,true)
tar
saveDependentMapInfo(op,opList) ==
not symbolMember?(op,opList) =>
lmml := [[op, :get(op, 'localModemap, $e)]]
gcl := [[op, :get(op, 'generatedCode, $e)]]
for [dep1,dep2] in getFlag("$dependencies") | dep1=op repeat
[lmml', :gcl'] := saveDependentMapInfo(dep2, [op, :opList])
lmms := append!(lmml', lmml)
gcl := append!(gcl', gcl)
[lmms, :gcl]
nil
restoreDependentMapInfo(op, opList, [lmml,:gcl]) ==
not symbolMember?(op,opList) =>
clearDependentMaps(op,opList)
for [op, :lmm] in lmml repeat
$e := putHist(op,'localModemap,lmm,$e)
for [op, :gc] in gcl repeat
$e := putHist(op,'generatedCode,gc,$e)
clearDependentMaps(op,opList) ==
-- clears the local modemaps of all the maps that depend on op
not symbolMember?(op,opList) =>
$e := putHist(op,'localModemap,nil,$e)
$e := putHist(op,'generatedCode,nil,$e)
for [dep1,dep2] in getFlag("$dependencies") | dep1=op repeat
clearDependentMaps(dep2,[op,:opList])
analyzeNonRecur(op,body,$localVars) ==
-- type analyze the non-recursive part of a map body
nrp := nonRecursivePart(op,body)
for lvar in findLocalVars(op,nrp) repeat mkLocalVar($mapName,lvar)
objMode(compileBody(nrp,$mapTarget))
nonRecursivePart(opName, funBody) ==
-- takes funBody, which is the parse tree of the definition of
-- a function, and returns a list of the parts
-- of the function which are not recursive in the name opName
body:= expandRecursiveBody([opName], funBody)
((nrp:=nonRecursivePart1(opName, body)) ~= '%noMapVal) => nrp
throwKeyedMsg("S2IM0012",[opName])
expandRecursiveBody(alreadyExpanded, body) ==
-- replaces calls to other maps with their bodies
atom body =>
(obj := get(body,'value,$e)) and objVal obj is ["%Map",:mapDef] and
((numMapArgs mapDef) = 0) => getMapBody(body,mapDef)
body
body is [op,:argl] =>
not symbolMember?(op,alreadyExpanded) =>
(obj := get(op,'value,$e)) and objVal obj is ["%Map",:mapDef] =>
newBody:= getMapBody(op,mapDef)
for arg in argl for var in $FormalMapVariableList repeat
newBody:=MSUBST(arg,var,newBody)
expandRecursiveBody([op,:alreadyExpanded],newBody)
[op,:[expandRecursiveBody(alreadyExpanded,arg) for arg in argl]]
[op,:[expandRecursiveBody(alreadyExpanded,arg) for arg in argl]]
keyedSystemError("S2GE0016",['"expandRecursiveBody",
'"unknown form of function body"])
nonRecursivePart1(opName, funBody) ==
-- returns a function body which contains only the parts of funBody
-- which do not call the function opName
funBody is ['IF,a,b,c] =>
nra:=nonRecursivePart1(opName,a)
nra = '%noMapVal => '%noMapVal
nrb:=nonRecursivePart1(opName,b)
nrc:=nonRecursivePart1(opName,c)
not (nrb in '(%noMapVal %noBranch)) => ['IF,nra,nrb,nrc]
not (nrc in '(%noMapVal %noBranch)) => ['IF,['not,nra],nrc,nrb]
'%noMapVal
not containsOp(funBody,'IF) =>
notCalled(opName,funBody) => funBody
'%noMapVal
funBody is [op,:argl] =>
op=opName => '%noMapVal
args:= [nonRecursivePart1(opName,arg) for arg in argl]
'%noMapVal in args => '%noMapVal
[op,:args]
funBody
containsOp(body,op) ==
-- true IFF body contains an op statement
body is [ =op,:.] => true
body is [.,:argl] => or/[containsOp(arg,op) for arg in argl]
false
notCalled(opName,form) ==
-- returns true if opName is not called in the form
atom form => true
form is [op,:argl] =>
op=opName => false
and/[notCalled(opName,x) for x in argl]
keyedSystemError("S2GE0016",['"notCalled",
'"unknown form of function body"])
mapDefsWithCorrectArgCount(n, mapDef) ==
[def for def in mapDef | (numArgs first def) = n]
numMapArgs(mapDef is [[args,:.],:.]) ==
-- returns the number of arguemnts to the map whose body is mapDef
numArgs args
numArgs args ==
args is ['_|,a,:.] => numArgs a
args is ["tuple",:argl] => #argl
null args => 0
1
combineMapParts(mapTail) ==
-- transforms a piece-wise function definition into an if-then-else
-- statement. Uses %noBranch to indicate undefined branch
null mapTail => '%noMapVal
mapTail is [[cond,:part],:restMap] =>
isSharpVarWithNum cond or (cond is ["tuple",:args] and
and/[isSharpVarWithNum arg for arg in args]) or (null cond) => part
['IF,mkMapPred cond,part,combineMapParts restMap]
keyedSystemError("S2GE0016",['"combineMapParts",
'"unknown function form"])
mkMapPred cond ==
-- create the predicate on map arguments, derived from "when" clauses
cond is ['_|,args,pred] => mapPredTran pred
cond is ["tuple",:vals] =>
mkValueCheck(vals,1)
mkValCheck(cond,1)
mkValueCheck(vals,i) ==
-- creates predicate for specific value check (i.e f 1 == 1)
vals is [val] => mkValCheck(val,i)
['and,mkValCheck(first vals,i),mkValueCheck(rest vals,i+1)]
mkValCheck(val,i) ==
-- create equality check for map predicates
isSharpVarWithNum val => 'true
['_=,mkSharpVar i,val]
mkSharpVar i ==
-- create #i
makeSymbol strconc('"#",STRINGIMAGE i)
mapPredTran pred ==
-- transforms "x in i..j" to "x>=i and x<=j"
pred is ['in,var,['SEGMENT,lb]] => mkLessOrEqual(lb,var)
pred is ['in,var,['SEGMENT,lb,ub]] =>
null ub => mkLessOrEqual(lb,var)
['and,mkLessOrEqual(lb,var),mkLessOrEqual(var,ub)]
pred
findLocalVars(op,form) ==
-- analyzes form for local and free variables, and returns the list
-- of locals
findLocalVars1(op,form)
$localVars
findLocalVars1(op,form) ==
-- sets the two lists $localVars and $freeVars
atom form =>
not ident? form or isSharpVarWithNum form => nil
isLocallyBound form or isFreeVar form => nil
mkFreeVar($mapName,form)
form is ['local, :vars] =>
for x in vars repeat
atom x => mkLocalVar(op, x)
form is ['free, :vars] =>
for x in vars repeat
atom x => mkFreeVar(op, x)
form is ["%LET",a,b] =>
(a is ["tuple",:vars]) and (b is ["tuple",:vals]) =>
for var in vars for val in vals repeat
findLocalVars1(op,["%LET",var,val])
a is ['construct,:pat] =>
for var in listOfVariables pat repeat mkLocalVar(op,var)
findLocalVars1(op,b)
(atom a) or (a is ['_:,a,.]) =>
mkLocalVar(op,a)
findLocalVars1(op,b)
findLocalVars1(op,b)
for x in a repeat findLocalVars1(op,x)
form is ['_:,a,.] =>
mkLocalVar(op,a)
form is ['is,l,pattern] =>
findLocalVars1(op,l)
for var in listOfVariables rest pattern repeat
mkLocalVar(op,var)
form is [oper,:itrl,body] and oper in '(REPEAT COLLECT %collect) =>
findLocalsInLoop(op,itrl,body)
form is ['%loop,:itrl,val,body] =>
findLocalsInLoop(op,itrl,[body,val])
form is ['%bind,bindings,:body] =>
findExternalVarsInBindExpr(op,bindings,body)
form is [y,:argl] =>
y is "Record" or (y is "Union" and argl is [[":",.,.],:.]) =>
-- don't pick field tags, their are not variables.
for [.,.,t] in argl repeat
findLocalVars1(op,t)
for x in argl repeat findLocalVars1(op,x)
keyedSystemError("S2IM0020",[op])
findLocalsInLoop(op,itrl,body) ==
savedLocalVars := $localVars
iterVars := nil
for it in itrl repeat
it is ['STEP,index,lower,step,:upperList] =>
iterVars := [index,:iterVars]
mkLocalVar(op,index)
findLocalVars1(op,lower)
for up in upperList repeat findLocalVars1(op,up)
it is [op,index,s] and op in '(IN %init) =>
iterVars := [index,:iterVars]
mkLocalVar(op,index)
findLocalVars1(op,s)
it is ['WHILE,b] => findLocalVars1(op,b)
it is ['_|,pred] => findLocalVars1(op,pred)
findLocalVars1(op,body)
for it in itrl repeat
it is [op,b] and (op in '(UNTIL)) =>
findLocalVars1(op,b)
$localVars := setUnion(savedLocalVars,setDifference($localVars,iterVars))
++ Subroutine of findLocalVars1.
++ Find variables in a bind-expressions that are external to that block.
findExternalVarsInBindExpr(op,bindings,stmts) ==
savedLocalVars := $localVars
boundVars := nil
for [var,init] in bindings repeat
findLocalVars1(op,init)
boundVars := [var,:boundVars]
mkLocalVar(op,var)
for stmt in stmts repeat
findLocalVars1(op,stmt)
$localVars := setUnion(savedLocalVars,setDifference($localVars,boundVars))
isFreeVar(var) ==
member(var,$freeVars)
mkLocalVar(op,var) ==
-- add var to the local variable list
isFreeVar(var) => $localVars
$localVars:= insert(var,$localVars)
mkFreeVar(op,var) ==
-- op here for symmetry with mkLocalVar
$freeVars:= insert(var,$freeVars)
listOfVariables pat ==
-- return a list of the variables in pat, which is an "is" pattern
ident? pat => (pat='_. => nil ; [pat])
pat is ['_:,var] or pat is ['_=,var] =>
(var='_. => nil ; [var])
cons? pat => removeDuplicates [:listOfVariables p for p in pat]
nil
getMapBody(op,mapDef) ==
-- looks in $e for a map body; if not found it computes then stores it
get(op,'mapBody,$e) or
combineMapParts mapDef
-- $e:= putHist(op,'mapBody,body:= combineMapParts mapDef,$e)
-- body
getLocalVars(op,body) ==
-- looks in $e for local vars; if not found, computes then stores them
get(op,'localVars,$e) or
$e:= putHist(op,'localVars,lv:=findLocalVars(op,body),$e)
lv
-- DO NOT BELIEVE ALL OF THE FOLLOWING (IT IS OLD)
-- VARIABLES. Variables may or may not have a mode property. If
-- present, any value which is assigned or generated by that variable
-- is first coerced to that mode before being assigned or returned.
--
--
-- Variables are given a triple [val,m,e] as a "value" property on
-- its property list in the environment. The expression val has the
-- forms:
--
-- (WRAPPED . y) --value of x is y (don't re-evaluate)
-- y --anything else --value of x is obtained by evaluating y
--
-- A wrapped expression is created by an assignment. In the second
-- case, y can never contain embedded wrapped expressions. The mode
-- part m of the triple is the type of y in the wrapped case and is
-- consistent with the declared mode if given. The mode part of an
-- unwrapped value is always $EmptyMode. The e part is usually nil
-- but may be used to hold a partial closure.
--
-- Effect of changes. A rule can be built up for a variable by
-- successive rules involving conditional expressions. However, once
-- a value is assigned to the variable or an unconditional definition
-- is given, any existing value is replaced by the new entry. When
-- the mode of a variable is declared, an wrapped value is coerced to
-- the new mode; if this is not possible, the user is notified that
-- the current value is discarded and why. When the mode is
-- redeclared and an upwrapped value is present, the value is
-- retained; the only other effect is to coerce any cached values
-- from the old mode to the new one.
--
-- Caches. When a variable x is evaluated and re-evaluation occurs,
-- the triple produced by that evaluation is stored under "cache" on
-- the property list of x. This cached triple is cleared whenever any
-- of the variables which x's value depend upon change. Dependencies
-- are stored on $dependencies whose value has the form [[a b ..] ..]
-- to indicate that when a is changed, b .. must have all cached
-- values destroyed. In the case of parameterized forms which are
-- represented by maps, we currently can cache values only when the
-- compiler option is turned on by )on c s meaning "on compiler with
-- the save option". When f is compiled as f;1, it then has an alist
-- f;1;AL which records these values. If f depends globally on a's
-- value, all cached values of all local functions defined for f have
-- to be declared. If a's mode should change, then all compilations
-- of f must be thrown away.
--
-- PARAMETERIZED FORMS. These always have values [val,m,e] where val
-- are "maps".
--
-- The structure of maps:
-- (%Map (pattern . rewrite) ...) where
-- pattern has forms: arg-pattern
-- (tuple arg-pattern ...)
-- rewrite has forms: (WRAPPED . value) --don't re-evaluate
-- computational object --don't (bother to)
-- re-evaluate
-- anything else --yes, re-evaluate
--
-- When assigning values to a map, each new value must have a type
-- which is consistent with those already assigned. Initially, type
-- of %Map is $EmptyMode. When the map is first assigned a value, the
-- type of the %Map is RPLACDed to be (Mapping target source ..).
-- When the map is next assigned, the type of both source and target
-- is upgraded to be consistent with those values already computed.
-- Of course, if new and old source and target are identical, nothing
-- need happen to existing entries. However, if the new and old are
-- different, all existing entries of the map are coerce to the new
-- data type.
--
-- Mode analysis. This is done on the bottomUp phase of the process.
-- If a function has been given a mapping declaration, this map is
-- placed in as the mode of the map under the "value" property of the
-- variable. Of course, these modes may be partial types in case a
-- mode analysis is still necessary. If no mapping declaration, a
-- total mode analysis of the function, given its input arguments, is
-- done. This will result a signature involving types only.
--
-- If the compiler is on, the function is then compiled given this
-- signature involving types. If the map is value of a variable f, a
-- function is given name f;1, f is given a "localModemap" property
-- with modemap ((dummy target source ..) (T f;1)) so that the next
-- time f is applied to arguments which coerce to the source
-- arguments of this local modemap, f;1 will be invoked.
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