aboutsummaryrefslogtreecommitdiff
path: root/src/interp/interop.boot
blob: be8354c3683cf72b2d625d5691500a6793515dde (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
-- Copyright (c) 1991-2002, The Numerical Algorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2010, 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 c_-util
import hashcode
namespace BOOT

-- note domainObjects are now (dispatchVector hashCode . domainVector)
-- lazy oldAxiomDomainObjects are (dispatchVector hashCode  (Call form) . backptr), 
-- pre oldAxiomCategory is (dispatchVector . (cat form))
-- oldAxiomCategory objects are (dispatchVector . ( (cat form)  hash defaultpack parentlist))

hashCode? x == integer? x

$domainTypeTokens := ['lazyOldAxiomDomain, 'oldAxiomDomain, 'oldAxiomPreCategory,
           'oldAxiomCategory, 0]

-- The name game.
-- The compiler produces names that are of the form:
-- a) cons(0, <string>)
-- b) cons(1, type-name, arg-names...)
-- c) cons(2, arg-names...)
-- d) cons(3, value)
-- NB: (c) is for tuple-ish constructors, 
--     and (d) is for dependent types.

DNameStringID := 0
DNameApplyID  := 1
DNameTupleID  := 2
DNameOtherID  := 3

DNameToSExpr1 dname ==
  null dname => error "unexpected domain name"
  first dname = DNameStringID => 
    INTERN(CompStrToString rest dname)
  name0 := DNameToSExpr1 second dname
  args  := rest rest dname
  name0 = '_-_> => 
    froms := first args
    froms := MAPCAR(function DNameToSExpr, rest froms)
    ret   := second args -- a tuple
    ret   := DNameToSExpr second ret -- contents
    ['Mapping,:[ret,:froms]]
  name0 = 'Union or name0 = 'Record =>
    sxs := MAPCAR(function DNameToSExpr, rest first args)
    [name0,:sxs]
  name0 = 'Enumeration =>
    [name0,:MAPCAR(function DNameFixEnum, rest first args)]
  [name0,:MAPCAR(function DNameToSExpr, args)]

DNameToSExpr dname ==
  first dname = DNameOtherID  =>
        rest dname
  sx := DNameToSExpr1 dname
  cons? sx => sx
  [sx]

DNameFixEnum arg == CompStrToString rest arg
  
SExprToDName(sexpr, cosigVal) == 
  -- is it a non-type valued object?
  NOT cosigVal => [DNameOtherID, :sexpr]
  if first sexpr = '_: then sexpr := third sexpr
  first sexpr = 'Mapping =>
    args := [ SExprToDName(sx,true) for sx in rest sexpr]
    [DNameApplyID,
         [DNameStringID,: StringToCompStr '"->"],
              [DNameTupleID, : rest args],
                 [DNameTupleID, first args]]
  name0 :=   [DNameStringID, : StringToCompStr SYMBOL_-NAME first sexpr]
  first sexpr = 'Union or first sexpr = 'Record =>
    [DNameApplyID, name0, 
        [DNameTupleID,: [ SExprToDName(sx,true) for sx in rest sexpr]]]
  newCosig := rest getDualSignatureFromDB first sexpr
  [DNameApplyID, name0,
   : MAPCAR(function SExprToDName, rest sexpr, newCosig)]

-- local garbage because Compiler strings are null terminated
StringToCompStr(str) == 
   strconc(str, STRING (CODE_-CHAR 0))

CompStrToString(str) == 
   SUBSTRING(str, 0, (# str - 1))
-- local garbage ends

runOldAxiomFunctor(:allArgs) ==
  [:args,env] := allArgs
  getConstructorKindFromDB env = "category" =>
      [$oldAxiomPreCategoryDispatch,: [env, :args]]
  dom:=apply(env, args)
  makeOldAxiomDispatchDomain dom

makeLazyOldAxiomDispatchDomain domform ==
  attribute? domform =>
      [$attributeDispatch, domform, hashString(SYMBOL_-NAME domform)]
  getConstructorKindFromDB opOf domform = "category" =>
      [$oldAxiomPreCategoryDispatch,: domform]
  dd := [$lazyOldAxiomDomainDispatch, hashTypeForm(domform,0), domform]
  NCONC(dd,dd) -- installs back pointer to head of domain.
  dd

makeOldAxiomDispatchDomain dom ==
  cons? dom => dom
  [$oldAxiomDomainDispatch,hashTypeForm(dom.0,0),:dom]

closeOldAxiomFunctor(name) ==
   [function runOldAxiomFunctor,:SYMBOL_-FUNCTION name]

lazyOldAxiomDomainLookupExport(domenv, self, op, sig, box, skipdefaults, env) ==
  dom := instantiate domenv
  SPADCALL(rest dom, self, op, sig, box, skipdefaults, first dom.3)

lazyOldAxiomDomainHashCode(domenv, env) == first domenv

lazyOldAxiomDomainDevaluate(domenv, env) ==
  dom := instantiate domenv
  SPADCALL(rest dom, first dom.1)

lazyOldAxiomAddChild(domenv, kid, env) ==
  [$lazyOldAxiomDomainDispatch,:domenv]

$lazyOldAxiomDomainDispatch :=
   VECTOR('lazyOldAxiomDomain,
          [function lazyOldAxiomDomainDevaluate],
          [nil],
          [function lazyOldAxiomDomainLookupExport],
          [function lazyOldAxiomDomainHashCode],
          [function lazyOldAxiomAddChild])

-- old Axiom pre category objects are just (dispatch . catform)
-- where catform is ('categoryname,: evaluated args)
-- old Axiom category objects are  (dispatch . [catform, hashcode, defaulting package, parent vector, dom])
oldAxiomPreCategoryBuild(catform, dom, env) ==
   pack := oldAxiomCategoryDefaultPackage(catform, dom)
   [$oldAxiomCategoryDispatch,
       :[catform, hashTypeForm(catform,0), pack, oldAxiomPreCategoryParents(catform,dom), dom]]
oldAxiomPreCategoryHashCode(catform, env) == hashTypeForm(catform,0)
oldAxiomCategoryDefaultPackage(catform, dom) ==
    hasDefaultPackage opOf catform 

oldAxiomPreCategoryDevaluate([op,:args], env) ==
   SExprToDName([op,:devaluateList args], true)

$oldAxiomPreCategoryDispatch :=
   VECTOR('oldAxiomPreCategory,
          [function oldAxiomPreCategoryDevaluate],
          [nil],
          [nil],
          [function oldAxiomPreCategoryHashCode],
          [function oldAxiomPreCategoryBuild],
          [nil])

oldAxiomCategoryDevaluate([[op,:args],:.], env) ==
   SExprToDName([op,:devaluateList args], true)

oldAxiomPreCategoryParents(catform,dom) ==
  vars := ["$",:rest getConstructorFormFromDB opOf catform]
  vals := [dom,:rest catform]
  -- parents :=  getConstructorParentsFromDB opOf catform
  parents := parentsOf opOf catform
  PROGV(vars, vals,
    LIST2VEC
      [EVAL quoteCatOp cat for [cat,:pred] in parents | EVAL pred])

quoteCatOp cat == 
   atom cat => MKQ cat
   ['LIST, MKQ first cat,: rest cat]


oldAxiomCategoryLookupExport(catenv, self, op, sig, box, env) ==
   [catform,hash, pack,:.] := catenv
   opIsHasCat op => if EQL(sig, hash) then [self] else nil
   null(pack) => nil
   if not VECP pack then
       pack:=apply(pack, [self, :rest catform])
       catenv.rest.rest.first := pack
   fun := basicLookup(op, sig, pack, self) => [fun]
   nil

oldAxiomCategoryParentCount([.,.,.,parents,.], env) == # parents
oldAxiomCategoryNthParent([.,.,.,parvec,dom], n, env) ==
  catform := parvec.(n-1)
  VECTORP KAR catform => catform
  newcat := oldAxiomPreCategoryBuild(catform,dom,nil)
  SETELT(parvec, n-1, newcat)
  newcat

oldAxiomCategoryBuild([catform,:.], dom, env) ==
  oldAxiomPreCategoryBuild(catform,dom, env)
oldAxiomCategoryHashCode([.,hash,:.], env) == hash

$oldAxiomCategoryDispatch :=
   VECTOR('oldAxiomCategory,
          [function oldAxiomCategoryDevaluate],
          [nil],
          [function oldAxiomCategoryLookupExport],
          [function oldAxiomCategoryHashCode],
          [function oldAxiomCategoryBuild], -- builder ??
          [function oldAxiomCategoryParentCount],
          [function oldAxiomCategoryNthParent]) -- 1 indexed

attributeDevaluate(attrObj, env) ==
   [name, hash] := attrObj
   StringToCompStr SYMBOL_-NAME name

attributeLookupExport(attrObj, self, op, sig, box, env) ==
   [name, hash] := attrObj
   opIsHasCat op => if EQL(hash, sig) then [self] else nil

attributeHashCode(attrObj, env) ==
   [name, hash] := attrObj
   hash

attributeCategoryBuild(attrObj, dom, env) ==
   [name, hash] := attrObj
   [$attributeDispatch, name, hash] 

attributeCategoryParentCount(attrObj, env) == 0

attributeNthParent(attrObj, env) == nil

$attributeDispatch :=
   VECTOR('attribute,
          [function attributeDevaluate],
          [nil],
          [function attributeLookupExport],
          [function attributeHashCode],
          [function attributeCategoryBuild], -- builder ??
          [function attributeCategoryParentCount],
          [function attributeNthParent]) -- 1 indexed


orderedDefaults(conform,domform) ==
  $depthAssocCache : local := MAKE_-HASHTABLE 'ID
  conList := [x for x in orderCatAnc (op := opOf conform) | hasDefaultPackage op]
  acc := nil
  ancestors := ancestorsOf(conform,domform)
  for x in conList repeat
    for y in ancestors | x = CAAR y repeat acc := [y,:acc]
  nreverse acc

instantiate domenv ==
   -- following is a patch for a bug in runtime.as
   -- has a lazy dispatch vector with an instantiated domenv
  VECTORP rest domenv => [$oldAxiomDomainDispatch ,: domenv]
  callForm := second domenv
  oldDom := CDDR domenv
  [functor,:args] := callForm
--  if null(fn := GETL(functor,'instantiate)) then
--     ofn := SYMBOL_-FUNCTION functor
--     loadFunctor functor
--     fn := SYMBOL_-FUNCTION functor
--     SETF(SYMBOL_-FUNCTION functor, ofn)
--     PUT(functor, 'instantiate, fn)
--  domvec := apply(fn, args)
  domvec := apply(functor, args)
  oldDom.first := $oldAxiomDomainDispatch
  oldDom.rest := [second oldDom,: domvec]
  oldDom

hashTypeForm([fn,: args], percentHash) == 
   hashType([fn,:devaluateList args], percentHash)

$hashOp1 := hashString '"1"
$hashOp0 := hashString '"0"
$hashOpApply := hashString '"apply"
$hashOpSet := hashString '"set!"
$hashSeg := hashString '".."
$hashPercent := hashString '"%"

oldAxiomDomainLookupExport _
  (domenv, self, op, sig, box, skipdefaults, env) ==
     domainVec := rest domenv
     if hashCode? op then
         EQL(op, $hashOp1) => op := 'One
         EQL(op, $hashOp0) => op := 'Zero
         EQL(op, $hashOpApply) => op := 'elt
         EQL(op, $hashOpSet) => op := 'setelt
         EQL(op, $hashSeg) => op := 'SEGMENT
     constant := nil
     if hashCode? sig and self and EQL(sig, getDomainHash self) then
       sig := '($)
       constant := true
     val :=
       skipdefaults => 
          oldCompLookupNoDefaults(op, sig, domainVec, self)
       oldCompLookup(op, sig, domainVec, self)
     null val => val
     if constant then val := SPADCALL val
     box.first := val
     box
     
oldAxiomDomainHashCode(domenv, env) == first domenv

oldAxiomDomainHasCategory(domenv, cat, env) ==
  HasAttribute(domvec := rest domenv, cat) or
    HasCategory(domvec, devaluate cat)

oldAxiomDomainDevaluate(domenv, env) == 
   SExprToDName(rest domenv.0, 'T)

oldAxiomAddChild(domenv, child, env) == [$oldAxiomDomainDispatch,:domenv]

$oldAxiomDomainDispatch :=
   VECTOR('oldAxiomDomain,
          [function oldAxiomDomainDevaluate],
          [nil],
          [function oldAxiomDomainLookupExport],
          [function oldAxiomDomainHashCode],
          [function oldAxiomAddChild])

basicLookupCheckDefaults(op,sig,domain,dollar) ==
  box := [nil]
  not VECP(dispatch := first dollar) => error "bad domain format"
  lookupFun := dispatch.3
  dispatch.0 = 0  =>  -- new compiler domain object
       hashPercent :=
          VECP dollar => hashType(dollar.0,0)
          hashType(dollar,0)

       hashSig :=
         hashCode? sig => sig
         hashType( ['Mapping,:sig], hashPercent)

       if symbol? op then op := hashString SYMBOL_-NAME op
       first SPADCALL(rest dollar, dollar, op, hashSig, box, not $lookupDefaults, lookupFun)
  first SPADCALL(rest dollar, dollar, op, sig, box, not $lookupDefaults, lookupFun)

$hasCatOpHash := hashString '"%%"
opIsHasCat op ==
  hashCode? op => EQL(op, $hasCatOpHash)
  op = "%%"

-- has cat questions lookup up twice if false
-- replace with following ?
--  not(opIsHasCat op) and
--     (u := lookupInDomainVector(op,sig,domvec,domvec)) => u

oldCompLookup(op, sig, domvec, dollar) ==
  $lookupDefaults:local := nil
  u := lookupInDomainVector(op,sig,domvec,dollar) => u
  $lookupDefaults := true
  lookupInDomainVector(op,sig,domvec,dollar)

oldCompLookupNoDefaults(op, sig, domvec, dollar) ==
  $lookupDefaults:local := nil
  lookupInDomainVector(op,sig,domvec,dollar)

hashNewLookupInTable(op,sig,dollar,[domain,opvec],flag) ==
  opIsHasCat op =>
      HasCategory(domain, sig)
  if hashCode? op and EQL(op, $hashOp1) then op := 'One
  if hashCode? op and EQL(op, $hashOp0) then op := 'Zero
  hashPercent :=
    VECP dollar => hashType(dollar.0,0)
    hashType(dollar,0)
  if hashCode? sig and EQL(sig, hashPercent) then 
         sig := hashType('(Mapping $), hashPercent)
  dollar = nil => systemError()
  $lookupDefaults = true =>
    hashNewLookupInCategories(op,sig,domain,dollar)      --lookup first in my cats
      or newLookupInAddChain(op,sig,domain,dollar)
  --fast path when called from newGoGet
  success := false
  if $monitorNewWorld then
    sayLooking(concat('"---->",form2String devaluate domain,
      '"----> searching op table for:","%l","  "),op,sig,dollar)
  someMatch := false
  numvec := getDomainByteVector domain
  predvec := domain.3
  max := MAXINDEX opvec
  k := getOpCode(op,opvec,max) or return
    flag => newLookupInAddChain(op,sig,domain,dollar)
    nil
  maxIndex := MAXINDEX numvec
  start := opvec.k
  finish :=
    QSGREATERP(max,k) => opvec.(QSPLUS(k,2))
    maxIndex
  if QSGREATERP(finish,maxIndex) then systemError '"limit too large"
  numArgs := if hashCode? sig then -1 else (#sig)-1
  success := nil
  $isDefaultingPackage: local :=
    -- use special defaulting handler when dollar non-trivial
    dollar ~= domain and isDefaultPackageForm? devaluate domain
  while finish > start repeat
    PROGN
      i := start
      numTableArgs :=numvec.i
      predIndex := numvec.(i := QSADD1 i)
      (predIndex ~= 0) and null testBitVector(predvec,predIndex) => nil
      exportSig :=
          [newExpandTypeSlot(numvec.(i + j + 1),
            dollar,domain) for j in 0..numTableArgs]
      sig ~= hashType(['Mapping,: exportSig],hashPercent) => nil --signifies no match
      loc := numvec.(i + numTableArgs + 2)
      loc = 1 => (someMatch := true)
      loc = 0 =>
        start := QSPLUS(start,QSPLUS(numTableArgs,4))
        i := start + 2
        someMatch := true --mark so that if subsumption fails, look for original
        subsumptionSig :=
          [newExpandTypeSlot(numvec.(QSPLUS(i,j)),
            dollar,domain) for j in 0..numTableArgs]
        if $monitorNewWorld then
          sayBrightly [formatOpSignature(op,sig),'"--?-->",
            formatOpSignature(op,subsumptionSig)]
        nil
      slot := domain.loc
      null atom slot =>
        QCAR slot = 'newGoGet => someMatch:=true
                   --treat as if operation were not there
        --if EQ(QCAR slot,'newGoGet) then
        --  UNWIND_-PROTECT --break infinite recursion
        --    ((SETELT(domain,loc,'skip); slot := replaceGoGetSlot QCDR slot),
        --      if domain.loc = 'skip then domain.loc := slot)
        return (success := slot)
      slot = 'skip =>       --recursive call from above 'replaceGoGetSlot
        return (success := newLookupInAddChain(op,sig,domain,dollar))
      systemError '"unexpected format"
    start := QSPLUS(start,QSPLUS(numTableArgs,4))
  (success ~= 'failed) and success =>
    if $monitorNewWorld then
      sayLooking1('"<----",uu) where uu() ==
        cons? success => [first success,:devaluate rest success]
        success
    success
  subsumptionSig and (u:= basicLookup(op,subsumptionSig,domain,dollar)) => u
  flag or someMatch => newLookupInAddChain(op,sig,domain,dollar)
  nil

hashNewLookupInCategories(op,sig,dom,dollar) ==
  slot4 := dom.4
  catVec := second slot4
  SIZE catVec = 0 => nil                      --early exit if no categories
  integer? KDR catVec.0 =>
    newLookupInCategories1(op,sig,dom,dollar) --old style
  $lookupDefaults : local := nil
  if $monitorNewWorld = true then sayBrightly concat('"----->",
    form2String devaluate dom,'"-----> searching default packages for ",op)
  predvec := dom.3
  packageVec := QCAR slot4
--the next three lines can go away with new category world
  varList := ['$,:$FormalMapVariableList]
  valueList := [dom,:[dom.(5+i) for i in 1..(# rest dom.0)]]
  valueList := [MKQ val for val in valueList]
  nsig := MSUBST(dom.0,dollar.0,sig)
  for i in 0..MAXINDEX packageVec |
       (entry := packageVec.i) and entry ~= true repeat
    package :=
      VECP entry =>
         if $monitorNewWorld then
           sayLooking1('"already instantiated cat package",entry)
         entry
      IDENTP entry =>
        cat := catVec.i
        packageForm := nil
        if not GETL(entry,'LOADED) then loadLib entry
        infovec := GETL(entry,'infovec)
        success :=
          --VECP infovec =>  ----new world
          true =>  ----new world
            opvec := infovec.1
            max := MAXINDEX opvec
            code := getOpCode(op,opvec,max)
            null code => nil
            byteVector := CDDDR infovec.3
            endPos :=
              code+2 > max => SIZE byteVector
              opvec.(code+2)
            --not nrunNumArgCheck(#(QCDR sig),byteVector,opvec.code,endPos) => nil
            --numOfArgs := byteVector.(opvec.code)
            --numOfArgs ~= #(QCDR sig) => nil
            packageForm := [entry,'$,:rest cat]
            package := evalSlotDomain(packageForm,dom)
            packageVec.i := package
            package
                           ----old world
          table := HGET($Slot1DataBase,entry) or systemError nil
          (u := LASSQ(op,table))
            and (v := or/[rest x for x in u]) =>
              packageForm := [entry,'$,:rest cat]
              package := evalSlotDomain(packageForm,dom)
              packageVec.i := package
              package
          nil
        null success =>
          if $monitorNewWorld = true then
            sayBrightlyNT '"  not in: "
            pp (packageForm and devaluate package or entry)
          nil
        if $monitorNewWorld then
          sayLooking1('"candidate default package instantiated: ",success)
        success
      entry
    null package => nil
    if $monitorNewWorld then
      sayLooking1('"Looking at instantiated package ",package)
    res := basicLookup(op,sig,package,dollar) =>
      if $monitorNewWorld = true then
        sayBrightly '"candidate default package succeeds"
      return res
    if $monitorNewWorld = true then
      sayBrightly '"candidate fails -- continuing to search categories"
    nil

HasAttribute(domain,attrib) ==
  hashPercent :=
       VECP domain => hashType(domain.0,0)
       hashType(domain,0)
  isDomain domain =>
     FIXP((first domain).0) => 
        -- following call to hashType was missing 2nd arg. 
        -- getDomainHash domain added on 4/01/94 by RSS
        basicLookup("%%",hashType(attrib, hashPercent),domain,domain)
     HasAttribute(CDDR domain, attrib)
-->
  isNewWorldDomain domain => newHasAttribute(domain,attrib)
--+
  (u := LASSOC(attrib,domain.2)) and lookupPred(first u,domain,domain)
 
newHasAttribute(domain,attrib) ==
  hashPercent :=
       VECP domain => hashType(domain.0,0)
       hashType(domain,0)
  predIndex :=
     hashCode? attrib =>
        -- following call to hashType was missing 2nd arg. 
        -- hashPercent added by PAB 15/4/94
        or/[x for x in domain.2 | attrib = hashType(first x, hashPercent)]
     LASSOC(attrib,domain.2)
  predIndex =>
    predIndex = 0 => true
    predvec := domain.3
    testBitVector(predvec,predIndex)
  false

newHasCategory(domain,catform) ==
  catform = $Type or catform = $Category => true  
  catform is ["Join",:cats] => 
    and/[newHasCategory(domain,cat) for cat in cats]
  slot4 := domain.4
  auxvec := first slot4
  catvec := second slot4
  $isDefaultingPackage: local := isDefaultPackageForm? devaluate domain
  #catvec > 0 and integer? KDR catvec.0 =>              --old style
    predIndex := lazyMatchAssocV1(catform,catvec,domain)
    null predIndex => false
    predIndex = 0 => true
    predvec := QVELT(domain,3)
    testBitVector(predvec,predIndex)
  lazyMatchAssocV(catform,auxvec,catvec,domain)         --new style

getCatForm(catvec, index, domain) ==
   NUMBERP(form := QVELT(catvec,index)) => domain.form
   form

HasSignature(domain,[op,sig]) ==
  compiledLookup(op,sig,domain)
 
HasCategory(domain,catform') ==
  catform' is ['SIGNATURE,:f] => HasSignature(domain,f)
  catform' is ['ATTRIBUTE,f] => HasAttribute(domain,f)
  isDomain domain =>
     FIXP((first domain).0) =>
        catform' := devaluate catform'
        basicLookup("%%",catform',domain,domain)
     HasCategory(CDDR domain, catform')
  catform:= devaluate catform'
  isNewWorldDomain domain => newHasCategory(domain,catform)
  domain0:=domain.0 -- handles old style domains, Record, Union etc.
  slot4 := domain.4
  catlist := slot4.1
  member(catform,catlist) or
   opOf(catform) in '(Object Type) or  --temporary hack
    or/[compareSigEqual(catform,cat,domain0,domain) for cat in catlist]

--systemDependentMkAutoload(fn,cnam) ==
--    FBOUNDP(cnam) => "next"
--    SETF(SYMBOL_-FUNCTION cnam,mkAutoLoad(fn, cnam))

domainEqual(a,b) == 
  VECP a and VECP b and a.0 = b.0