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
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 057immutable.cc</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #aaaaaa; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; }
a { color:#eeeeee; text-decoration: none; }
a:hover { text-decoration: underline; }
* { font-size: 12pt; font-size: 1em; }
.Conceal { color: #4e4e4e; }
.traceContains { color: #008000; }
.Constant { color: #00a0a0; }
.LineNr { color: #444444; }
.Identifier { color: #c0a020; }
.muData { color: #ffff00; }
.Normal { color: #aaaaaa; background-color: #080808; padding-bottom: 1px; }
.Comment { color: #9090ff; }
.Comment a { color:#0000ee; text-decoration:underline; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.cSpecial { color: #008000; }
.muRecipe { color: #ff8700; }
-->
</style>
<script type='text/javascript'>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Ingredients of a recipe are meant to be immutable unless they're also</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: products. This layer will start enforcing this check.</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//:</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: One hole for now: variables in surrounding spaces are implicitly mutable.</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: [tag: todo]</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products)</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># mutable container</span>
<span id="L9" class="LineNr"> 9 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L10" class="LineNr"> 10 </span> local-scope
<span id="L11" class="LineNr"> 11 </span> <span class="Normal">p</span>:point<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
<span id="L12" class="LineNr"> 12 </span> p<span class="Special"> <- </span>foo p
<span id="L13" class="LineNr"> 13 </span>]
<span id="L14" class="LineNr"> 14 </span><span class="muRecipe">def</span> foo p:point<span class="muRecipe"> -> </span>p:point [
<span id="L15" class="LineNr"> 15 </span> local-scope
<span id="L16" class="LineNr"> 16 </span> load-ingredients
<span id="L17" class="LineNr"> 17 </span> p<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> p<span class="Delimiter">,</span> <span class="Constant">x:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L18" class="LineNr"> 18 </span>]
<span id="L19" class="LineNr"> 19 </span>$error: <span class="Constant">0</span>
<span id="L20" class="LineNr"> 20 </span>
<span id="L21" class="LineNr"> 21 </span><span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products_2)</span>
<span id="L22" class="LineNr"> 22 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L23" class="LineNr"> 23 </span> local-scope
<span id="L24" class="LineNr"> 24 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">point:type</span>
<span id="L25" class="LineNr"> 25 </span> p<span class="Special"> <- </span>foo p
<span id="L26" class="LineNr"> 26 </span>]
<span id="L27" class="LineNr"> 27 </span><span class="Comment"># mutable address to container</span>
<span id="L28" class="LineNr"> 28 </span><span class="muRecipe">def</span> foo p:&:point<span class="muRecipe"> -> </span>p:&:point [
<span id="L29" class="LineNr"> 29 </span> local-scope
<span id="L30" class="LineNr"> 30 </span> load-ingredients
<span id="L31" class="LineNr"> 31 </span> *p<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *p<span class="Delimiter">,</span> <span class="Constant">x:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L32" class="LineNr"> 32 </span>]
<span id="L33" class="LineNr"> 33 </span>$error: <span class="Constant">0</span>
<span id="L34" class="LineNr"> 34 </span>
<span id="L35" class="LineNr"> 35 </span><span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products_3)</span>
<span id="L36" class="LineNr"> 36 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L37" class="LineNr"> 37 </span> local-scope
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">p</span>:&:@:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">3</span>
<span id="L39" class="LineNr"> 39 </span> p<span class="Special"> <- </span>foo p
<span id="L40" class="LineNr"> 40 </span>]
<span id="L41" class="LineNr"> 41 </span><span class="Comment"># mutable address</span>
<span id="L42" class="LineNr"> 42 </span><span class="muRecipe">def</span> foo p:&:@:num<span class="muRecipe"> -> </span>p:&:@:num [
<span id="L43" class="LineNr"> 43 </span> local-scope
<span id="L44" class="LineNr"> 44 </span> load-ingredients
<span id="L45" class="LineNr"> 45 </span> *p<span class="Special"> <- </span>put-index *p<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L46" class="LineNr"> 46 </span>]
<span id="L47" class="LineNr"> 47 </span>$error: <span class="Constant">0</span>
<span id="L48" class="LineNr"> 48 </span>
<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">:(scenario ignore_literal_ingredients_for_immutability_checks)</span>
<span id="L50" class="LineNr"> 50 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L51" class="LineNr"> 51 </span> local-scope
<span id="L52" class="LineNr"> 52 </span> <span class="Normal">p</span>:&:d1<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">d1:type</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Normal">q</span>:num<span class="Special"> <- </span>foo p
<span id="L54" class="LineNr"> 54 </span>]
<span id="L55" class="LineNr"> 55 </span><span class="muRecipe">def</span> foo p:&:d1<span class="muRecipe"> -> </span>q:num [
<span id="L56" class="LineNr"> 56 </span> local-scope
<span id="L57" class="LineNr"> 57 </span> load-ingredients
<span id="L58" class="LineNr"> 58 </span> <span class="Normal">x</span>:&:d1<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">d1:type</span>
<span id="L59" class="LineNr"> 59 </span> *x<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *x<span class="Delimiter">,</span> <span class="Constant">p:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># ignore this 'p'</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Identifier">return</span> <span class="Constant">36</span>
<span id="L61" class="LineNr"> 61 </span>]
<span id="L62" class="LineNr"> 62 </span><span class="muData">container</span> d1 [
<span id="L63" class="LineNr"> 63 </span> <span class="Normal">p</span>:num
<span id="L64" class="LineNr"> 64 </span> <span class="Normal">q</span>:num
<span id="L65" class="LineNr"> 65 </span>]
<span id="L66" class="LineNr"> 66 </span>$error: <span class="Constant">0</span>
<span id="L67" class="LineNr"> 67 </span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">:(scenario cannot_modify_immutable_ingredients)</span>
<span id="L69" class="LineNr"> 69 </span><span class="Special">% Hide_errors = true;</span>
<span id="L70" class="LineNr"> 70 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L71" class="LineNr"> 71 </span> local-scope
<span id="L72" class="LineNr"> 72 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L73" class="LineNr"> 73 </span> foo x
<span id="L74" class="LineNr"> 74 </span>]
<span id="L75" class="LineNr"> 75 </span><span class="Comment"># immutable address to primitive</span>
<span id="L76" class="LineNr"> 76 </span><span class="muRecipe">def</span> foo x:&:num [
<span id="L77" class="LineNr"> 77 </span> local-scope
<span id="L78" class="LineNr"> 78 </span> load-ingredients
<span id="L79" class="LineNr"> 79 </span> *x<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L80" class="LineNr"> 80 </span>]
<span id="L81" class="LineNr"> 81 </span><span class="traceContains">+error: foo: cannot modify 'x' in <a href='010vm.cc.html#L32'>instruction</a> '*x <- copy 34' because it's an ingredient of recipe foo but not also a product</span>
<span id="L82" class="LineNr"> 82 </span>
<span id="L83" class="LineNr"> 83 </span><span class="Delimiter">:(scenario cannot_modify_immutable_containers)</span>
<span id="L84" class="LineNr"> 84 </span><span class="Special">% Hide_errors = true;</span>
<span id="L85" class="LineNr"> 85 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L86" class="LineNr"> 86 </span> local-scope
<span id="L87" class="LineNr"> 87 </span> <span class="Normal">x</span>:point-number<span class="Special"> <- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span><span class="Delimiter">,</span> <span class="Constant">36</span>
<span id="L88" class="LineNr"> 88 </span> foo x
<span id="L89" class="LineNr"> 89 </span>]
<span id="L90" class="LineNr"> 90 </span><span class="Comment"># immutable container</span>
<span id="L91" class="LineNr"> 91 </span><span class="muRecipe">def</span> foo x:point-number [
<span id="L92" class="LineNr"> 92 </span> local-scope
<span id="L93" class="LineNr"> 93 </span> load-ingredients
<span id="L94" class="LineNr"> 94 </span> <span class="Comment"># copy an element: ok</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Normal">y</span>:point<span class="Special"> <- </span>get x<span class="Delimiter">,</span> <span class="Constant">xy:offset</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Comment"># modify the element: boom</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Comment"># This could be ok if y contains no addresses, but we're not going to try to be that smart.</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Comment"># It also makes the rules easier to reason about. If it's just an ingredient, just don't try to change it.</span>
<span id="L99" class="LineNr"> 99 </span> y<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> y<span class="Delimiter">,</span> <span class="Constant">x:offset</span><span class="Delimiter">,</span> <span class="Constant">37</span>
<span id="L100" class="LineNr">100 </span>]
<span id="L101" class="LineNr">101 </span><span class="traceContains">+error: foo: cannot modify 'y' in <a href='010vm.cc.html#L32'>instruction</a> 'y <- put y, x:offset, 37' because that would modify 'x' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> foo but not also a product</span>
<span id="L102" class="LineNr">102 </span>
<span id="L103" class="LineNr">103 </span><span class="Delimiter">:(scenario can_modify_immutable_pointers)</span>
<span id="L104" class="LineNr">104 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L105" class="LineNr">105 </span> local-scope
<span id="L106" class="LineNr">106 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L107" class="LineNr">107 </span> foo x
<span id="L108" class="LineNr">108 </span>]
<span id="L109" class="LineNr">109 </span><span class="muRecipe">def</span> foo x:&:num [
<span id="L110" class="LineNr">110 </span> local-scope
<span id="L111" class="LineNr">111 </span> load-ingredients
<span id="L112" class="LineNr">112 </span> <span class="Comment"># modify the address, not the payload</span>
<span id="L113" class="LineNr">113 </span> x<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L114" class="LineNr">114 </span>]
<span id="L115" class="LineNr">115 </span>$error: <span class="Constant">0</span>
<span id="L116" class="LineNr">116 </span>
<span id="L117" class="LineNr">117 </span><span class="Delimiter">:(scenario can_modify_immutable_pointers_but_not_their_payloads)</span>
<span id="L118" class="LineNr">118 </span><span class="Special">% Hide_errors = true;</span>
<span id="L119" class="LineNr">119 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L120" class="LineNr">120 </span> local-scope
<span id="L121" class="LineNr">121 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L122" class="LineNr">122 </span> foo x
<span id="L123" class="LineNr">123 </span>]
<span id="L124" class="LineNr">124 </span><span class="muRecipe">def</span> foo x:&:num [
<span id="L125" class="LineNr">125 </span> local-scope
<span id="L126" class="LineNr">126 </span> load-ingredients
<span id="L127" class="LineNr">127 </span> <span class="Comment"># modify address; ok</span>
<span id="L128" class="LineNr">128 </span> x<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L129" class="LineNr">129 </span> <span class="Comment"># modify payload: boom</span>
<span id="L130" class="LineNr">130 </span> <span class="Comment"># this could be ok, but we're not going to try to be that smart</span>
<span id="L131" class="LineNr">131 </span> *x<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L132" class="LineNr">132 </span>]
<span id="L133" class="LineNr">133 </span><span class="traceContains">+error: foo: cannot modify 'x' in <a href='010vm.cc.html#L32'>instruction</a> '*x <- copy 34' because it's an ingredient of recipe foo but not also a product</span>
<span id="L134" class="LineNr">134 </span>
<span id="L135" class="LineNr">135 </span><span class="Delimiter">:(scenario cannot_call_mutating_recipes_on_immutable_ingredients)</span>
<span id="L136" class="LineNr">136 </span><span class="Special">% Hide_errors = true;</span>
<span id="L137" class="LineNr">137 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L138" class="LineNr">138 </span> local-scope
<span id="L139" class="LineNr">139 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">point:type</span>
<span id="L140" class="LineNr">140 </span> foo p
<span id="L141" class="LineNr">141 </span>]
<span id="L142" class="LineNr">142 </span><span class="muRecipe">def</span> foo p:&:point [
<span id="L143" class="LineNr">143 </span> local-scope
<span id="L144" class="LineNr">144 </span> load-ingredients
<span id="L145" class="LineNr">145 </span> bar p
<span id="L146" class="LineNr">146 </span>]
<span id="L147" class="LineNr">147 </span><span class="muRecipe">def</span> bar p:&:point<span class="muRecipe"> -> </span>p:&:point [
<span id="L148" class="LineNr">148 </span> local-scope
<span id="L149" class="LineNr">149 </span> load-ingredients
<span id="L150" class="LineNr">150 </span> <span class="Comment"># p could be modified here, but it doesn't have to be, it's already marked</span>
<span id="L151" class="LineNr">151 </span> <span class="Comment"># mutable in the header</span>
<span id="L152" class="LineNr">152 </span>]
<span id="L153" class="LineNr">153 </span><span class="traceContains">+error: foo: cannot modify 'p' in <a href='010vm.cc.html#L32'>instruction</a> 'bar p' because it's an ingredient of recipe foo but not also a product</span>
<span id="L154" class="LineNr">154 </span>
<span id="L155" class="LineNr">155 </span><span class="Delimiter">:(scenario cannot_modify_copies_of_immutable_ingredients)</span>
<span id="L156" class="LineNr">156 </span><span class="Special">% Hide_errors = true;</span>
<span id="L157" class="LineNr">157 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L158" class="LineNr">158 </span> local-scope
<span id="L159" class="LineNr">159 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">point:type</span>
<span id="L160" class="LineNr">160 </span> foo p
<span id="L161" class="LineNr">161 </span>]
<span id="L162" class="LineNr">162 </span><span class="muRecipe">def</span> foo p:&:point [
<span id="L163" class="LineNr">163 </span> local-scope
<span id="L164" class="LineNr">164 </span> load-ingredients
<span id="L165" class="LineNr">165 </span> <span class="Normal">q</span>:&:point<span class="Special"> <- </span>copy p
<span id="L166" class="LineNr">166 </span> *q<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *q<span class="Delimiter">,</span> <span class="Constant">x:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L167" class="LineNr">167 </span>]
<span id="L168" class="LineNr">168 </span><span class="traceContains">+error: foo: cannot modify 'q' in <a href='010vm.cc.html#L32'>instruction</a> '*q <- put *q, x:offset, 34' because that would modify p which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> foo but not also a product</span>
<span id="L169" class="LineNr">169 </span>
<span id="L170" class="LineNr">170 </span><span class="Delimiter">:(scenario can_modify_copies_of_mutable_ingredients)</span>
<span id="L171" class="LineNr">171 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L172" class="LineNr">172 </span> local-scope
<span id="L173" class="LineNr">173 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">point:type</span>
<span id="L174" class="LineNr">174 </span> foo p
<span id="L175" class="LineNr">175 </span>]
<span id="L176" class="LineNr">176 </span><span class="muRecipe">def</span> foo p:&:point<span class="muRecipe"> -> </span>p:&:point [
<span id="L177" class="LineNr">177 </span> local-scope
<span id="L178" class="LineNr">178 </span> load-ingredients
<span id="L179" class="LineNr">179 </span> <span class="Normal">q</span>:&:point<span class="Special"> <- </span>copy p
<span id="L180" class="LineNr">180 </span> *q<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *q<span class="Delimiter">,</span> <span class="Constant">x:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L181" class="LineNr">181 </span>]
<span id="L182" class="LineNr">182 </span>$error: <span class="Constant">0</span>
<span id="L183" class="LineNr">183 </span>
<span id="L184" class="LineNr">184 </span><span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients)</span>
<span id="L185" class="LineNr">185 </span><span class="Special">% Hide_errors = true;</span>
<span id="L186" class="LineNr">186 </span><span class="muData">container</span> foo [
<span id="L187" class="LineNr">187 </span> <span class="Normal">x</span>:&:@:num <span class="Comment"># contains an address</span>
<span id="L188" class="LineNr">188 </span>]
<span id="L189" class="LineNr">189 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L190" class="LineNr">190 </span> <span class="Comment"># don't run anything</span>
<span id="L191" class="LineNr">191 </span>]
<span id="L192" class="LineNr">192 </span><span class="muRecipe">def</span> foo a:&:foo [
<span id="L193" class="LineNr">193 </span> local-scope
<span id="L194" class="LineNr">194 </span> load-ingredients
<span id="L195" class="LineNr">195 </span> <span class="Normal">x</span>:&:@:num<span class="Special"> <- </span>get *a<span class="Delimiter">,</span> <span class="Constant">x:offset</span> <span class="Comment"># just a regular get of the container</span>
<span id="L196" class="LineNr">196 </span> *x<span class="Special"> <- </span>put-index *x<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># but then a put-index on the result</span>
<span id="L197" class="LineNr">197 </span>]
<span id="L198" class="LineNr">198 </span><span class="traceContains">+error: foo: cannot modify 'x' in <a href='010vm.cc.html#L32'>instruction</a> '*x <- put-index *x, 0, 34' because that would modify a which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> foo but not also a product</span>
<span id="L199" class="LineNr">199 </span>
<span id="L200" class="LineNr">200 </span><span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_2)</span>
<span id="L201" class="LineNr">201 </span><span class="muData">container</span> foo [
<span id="L202" class="LineNr">202 </span> <span class="Normal">x</span>:&:@:num <span class="Comment"># contains an address</span>
<span id="L203" class="LineNr">203 </span>]
<span id="L204" class="LineNr">204 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L205" class="LineNr">205 </span> <span class="Comment"># don't run anything</span>
<span id="L206" class="LineNr">206 </span>]
<span id="L207" class="LineNr">207 </span><span class="muRecipe">def</span> foo a:&:foo [
<span id="L208" class="LineNr">208 </span> local-scope
<span id="L209" class="LineNr">209 </span> load-ingredients
<span id="L210" class="LineNr">210 </span> <span class="Normal">b</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>
<span id="L211" class="LineNr">211 </span> <span class="Comment"># modify b, completely unrelated to immutable ingredient a</span>
<span id="L212" class="LineNr">212 </span> <span class="Normal">x</span>:&:@:num<span class="Special"> <- </span>get b<span class="Delimiter">,</span> <span class="Constant">x:offset</span>
<span id="L213" class="LineNr">213 </span> *x<span class="Special"> <- </span>put-index *x<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L214" class="LineNr">214 </span>]
<span id="L215" class="LineNr">215 </span>$error: <span class="Constant">0</span>
<span id="L216" class="LineNr">216 </span>
<span id="L217" class="LineNr">217 </span><span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_3)</span>
<span id="L218" class="LineNr">218 </span><span class="Special">% Hide_errors = true;</span>
<span id="L219" class="LineNr">219 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L220" class="LineNr">220 </span> <span class="Comment"># don't run anything</span>
<span id="L221" class="LineNr">221 </span>]
<span id="L222" class="LineNr">222 </span><span class="muRecipe">def</span> foo a:&:@:&:num [
<span id="L223" class="LineNr">223 </span> local-scope
<span id="L224" class="LineNr">224 </span> load-ingredients
<span id="L225" class="LineNr">225 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span>index *a<span class="Delimiter">,</span> <span class="Constant">0</span> <span class="Comment"># just a regular index of the array</span>
<span id="L226" class="LineNr">226 </span> *x<span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># but then modify the result</span>
<span id="L227" class="LineNr">227 </span>]
<span id="L228" class="LineNr">228 </span><span class="traceContains">+error: foo: cannot modify 'x' in <a href='010vm.cc.html#L32'>instruction</a> '*x <- copy 34' because that would modify a which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> foo but not also a product</span>
<span id="L229" class="LineNr">229 </span>
<span id="L230" class="LineNr">230 </span><span class="Delimiter">:(scenario cannot_modify_address_inside_immutable_ingredients_4)</span>
<span id="L231" class="LineNr">231 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L232" class="LineNr">232 </span> <span class="Comment"># don't run anything</span>
<span id="L233" class="LineNr">233 </span>]
<span id="L234" class="LineNr">234 </span><span class="muRecipe">def</span> foo a:&:@:&:num [
<span id="L235" class="LineNr">235 </span> local-scope
<span id="L236" class="LineNr">236 </span> load-ingredients
<span id="L237" class="LineNr">237 </span> <span class="Normal">b</span>:&:@:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Delimiter">{(</span><a href='043space.cc.html#L82'>address</a> number<span class="Delimiter">)</span>: type<span class="Delimiter">},</span> <span class="Constant">3</span>
<span id="L238" class="LineNr">238 </span> <span class="Comment"># modify b, completely unrelated to immutable ingredient a</span>
<span id="L239" class="LineNr">239 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span>index *b<span class="Delimiter">,</span> <span class="Constant">0</span>
<span id="L240" class="LineNr">240 </span> *x<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L241" class="LineNr">241 </span>]
<span id="L242" class="LineNr">242 </span>$error: <span class="Constant">0</span>
<span id="L243" class="LineNr">243 </span>
<span id="L244" class="LineNr">244 </span><span class="Delimiter">:(scenario latter_ingredient_of_index_is_immutable)</span>
<span id="L245" class="LineNr">245 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L246" class="LineNr">246 </span> <span class="Comment"># don't run anything</span>
<span id="L247" class="LineNr">247 </span>]
<span id="L248" class="LineNr">248 </span><span class="muRecipe">def</span> foo a:&:@:&:@:num<span class="Delimiter">,</span> b:num<span class="muRecipe"> -> </span>a:&:@:&:@:num [
<span id="L249" class="LineNr">249 </span> local-scope
<span id="L250" class="LineNr">250 </span> load-ingredients
<span id="L251" class="LineNr">251 </span> <span class="Normal">x</span>:&:@:num<span class="Special"> <- </span>index *a<span class="Delimiter">,</span> b
<span id="L252" class="LineNr">252 </span> *x<span class="Special"> <- </span>put-index *x<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L253" class="LineNr">253 </span>]
<span id="L254" class="LineNr">254 </span>$error: <span class="Constant">0</span>
<span id="L255" class="LineNr">255 </span>
<span id="L256" class="LineNr">256 </span><span class="Delimiter">:(scenario can_traverse_immutable_ingredients)</span>
<span id="L257" class="LineNr">257 </span><span class="muData">container</span> test-list [
<span id="L258" class="LineNr">258 </span> <span class="Normal">next</span>:&:test-list
<span id="L259" class="LineNr">259 </span>]
<span id="L260" class="LineNr">260 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L261" class="LineNr">261 </span> local-scope
<span id="L262" class="LineNr">262 </span> <span class="Normal">p</span>:&:test-list<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">test-list:type</span>
<span id="L263" class="LineNr">263 </span> foo p
<span id="L264" class="LineNr">264 </span>]
<span id="L265" class="LineNr">265 </span><span class="muRecipe">def</span> foo p:&:test-list [
<span id="L266" class="LineNr">266 </span> local-scope
<span id="L267" class="LineNr">267 </span> load-ingredients
<span id="L268" class="LineNr">268 </span> <span class="Normal">p2</span>:&:test-list<span class="Special"> <- </span>bar p
<span id="L269" class="LineNr">269 </span>]
<span id="L270" class="LineNr">270 </span><span class="muRecipe">def</span> bar x:&:test-list<span class="muRecipe"> -> </span>y:&:test-list [
<span id="L271" class="LineNr">271 </span> local-scope
<span id="L272" class="LineNr">272 </span> load-ingredients
<span id="L273" class="LineNr">273 </span> y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> <span class="Constant">next:offset</span>
<span id="L274" class="LineNr">274 </span>]
<span id="L275" class="LineNr">275 </span>$error: <span class="Constant">0</span>
<span id="L276" class="LineNr">276 </span>
<span id="L277" class="LineNr">277 </span><span class="Delimiter">:(scenario treat_optional_ingredients_as_mutable)</span>
<span id="L278" class="LineNr">278 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L279" class="LineNr">279 </span> <span class="Normal">k</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L280" class="LineNr">280 </span> test k
<span id="L281" class="LineNr">281 </span>]
<span id="L282" class="LineNr">282 </span><span class="Comment"># recipe taking an immutable address ingredient</span>
<span id="L283" class="LineNr">283 </span><span class="muRecipe">def</span> test k:&:num [
<span id="L284" class="LineNr">284 </span> local-scope
<span id="L285" class="LineNr">285 </span> load-ingredients
<span id="L286" class="LineNr">286 </span> foo k
<span id="L287" class="LineNr">287 </span>]
<span id="L288" class="LineNr">288 </span><span class="Comment"># ..calling a recipe with an optional address ingredient</span>
<span id="L289" class="LineNr">289 </span><span class="muRecipe">def</span> foo<span class="muRecipe"> -> </span>[
<span id="L290" class="LineNr">290 </span> local-scope
<span id="L291" class="LineNr">291 </span> load-ingredients
<span id="L292" class="LineNr">292 </span> <span class="Normal">k</span>:&:num<span class="Delimiter">,</span> found?:<span class="Normal">bool</span><span class="Special"> <- </span>next-ingredient
<span id="L293" class="LineNr">293 </span> <span class="Comment"># we don't further check k for immutability, but assume it's mutable</span>
<span id="L294" class="LineNr">294 </span>]
<span id="L295" class="LineNr">295 </span>$error: <span class="Constant">0</span>
<span id="L296" class="LineNr">296 </span>
<span id="L297" class="LineNr">297 </span><span class="Delimiter">:(scenario treat_optional_ingredients_as_mutable_2)</span>
<span id="L298" class="LineNr">298 </span><span class="Special">% Hide_errors = true;</span>
<span id="L299" class="LineNr">299 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L300" class="LineNr">300 </span> local-scope
<span id="L301" class="LineNr">301 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">point:type</span>
<span id="L302" class="LineNr">302 </span> foo p
<span id="L303" class="LineNr">303 </span>]
<span id="L304" class="LineNr">304 </span><span class="muRecipe">def</span> foo p:&:point [
<span id="L305" class="LineNr">305 </span> local-scope
<span id="L306" class="LineNr">306 </span> load-ingredients
<span id="L307" class="LineNr">307 </span> bar p
<span id="L308" class="LineNr">308 </span>]
<span id="L309" class="LineNr">309 </span><span class="muRecipe">def</span> bar [
<span id="L310" class="LineNr">310 </span> local-scope
<span id="L311" class="LineNr">311 </span> load-ingredients
<span id="L312" class="LineNr">312 </span> <span class="Normal">p</span>:&:point<span class="Special"> <- </span>next-ingredient <span class="Comment"># optional ingredient; assumed to be mutable</span>
<span id="L313" class="LineNr">313 </span>]
<span id="L314" class="LineNr">314 </span><span class="traceContains">+error: foo: cannot modify 'p' in <a href='010vm.cc.html#L32'>instruction</a> 'bar p' because it's an ingredient of recipe foo but not also a product</span>
<span id="L315" class="LineNr">315 </span>
<span id="L316" class="LineNr">316 </span><span class="Comment">//: when checking for immutable ingredients, remember to take space into account</span>
<span id="L317" class="LineNr">317 </span><span class="Delimiter">:(scenario check_space_of_reagents_in_immutability_checks)</span>
<span id="L318" class="LineNr">318 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L319" class="LineNr">319 </span> <span class="Normal">a</span>:space/names:<span class="Normal">new</span>-closure<span class="Special"> <- </span><span class="Normal">new</span>-closure
<span id="L320" class="LineNr">320 </span> <span class="Normal">b</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L321" class="LineNr">321 </span> run-closure b:&:num<span class="Delimiter">,</span> a:space
<span id="L322" class="LineNr">322 </span>]
<span id="L323" class="LineNr">323 </span><span class="muRecipe">def</span> <span class="Normal">new</span>-closure [
<span id="L324" class="LineNr">324 </span> local-scope
<span id="L325" class="LineNr">325 </span> <span class="Normal">x</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L326" class="LineNr">326 </span> <span class="Identifier">return</span> <span class="Normal">default</span>-space/names:<span class="Normal">new</span>-closure
<span id="L327" class="LineNr">327 </span>]
<span id="L328" class="LineNr">328 </span><span class="muRecipe">def</span> run-closure x:&:num<span class="Delimiter">,</span> s:space/names:<span class="Normal">new</span>-closure [
<span id="L329" class="LineNr">329 </span> local-scope
<span id="L330" class="LineNr">330 </span> load-ingredients
<span id="L331" class="LineNr">331 </span> <span class="Constant">0</span>:space/names:<span class="Normal">new</span>-closure<span class="Special"> <- </span>copy s
<span id="L332" class="LineNr">332 </span> <span class="Comment"># different space; always mutable</span>
<span id="L333" class="LineNr">333 </span> *x:&:num/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
<span id="L334" class="LineNr">334 </span>]
<span id="L335" class="LineNr">335 </span>$error: <span class="Constant">0</span>
<span id="L336" class="LineNr">336 </span>
<span id="L337" class="LineNr">337 </span><span class="Delimiter">:(before "End Transforms")</span>
<span id="L338" class="LineNr">338 </span>Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='057immutable.cc.html#L341'>check_immutable_ingredients</a><span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span id="L339" class="LineNr">339 </span>
<span id="L340" class="LineNr">340 </span><span class="Delimiter">:(code)</span>
<span id="L341" class="LineNr">341 </span><span class="Normal">void</span> <a href='057immutable.cc.html#L341'>check_immutable_ingredients</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L342" class="LineNr">342 </span> <span class="Comment">// to ensure an address reagent isn't modified, it suffices to show that</span>
<span id="L343" class="LineNr">343 </span> <span class="Comment">// a) we never write to its contents directly,</span>
<span id="L344" class="LineNr">344 </span> <span class="Comment">// b) we never call 'put' or 'put-index' on it, and</span>
<span id="L345" class="LineNr">345 </span> <span class="Comment">// c) any non-primitive recipe calls in the body aren't returning it as a product</span>
<span id="L346" class="LineNr">346 </span> <span class="Normal">const</span> recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L347" class="LineNr">347 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- check mutability of ingredients in <a href='010vm.cc.html#L19'>recipe</a> "</span> << caller<span class="Delimiter">.</span>name << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L348" class="LineNr">348 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// skip check for old-style recipes calling next-ingredient directly</span>
<span id="L349" class="LineNr">349 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L350" class="LineNr">350 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent& current_ingredient = caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L351" class="LineNr">351 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span>caller<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// not expected to be immutable</span>
<span id="L352" class="LineNr">352 </span> <span class="Conceal">¦</span> <span class="Comment">// End Immutable Ingredients Special-cases</span>
<span id="L353" class="LineNr">353 </span> <span class="Conceal">¦</span> set<reagent> immutable_vars<span class="Delimiter">;</span>
<span id="L354" class="LineNr">354 </span> <span class="Conceal">¦</span> immutable_vars<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
<span id="L355" class="LineNr">355 </span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L356" class="LineNr">356 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L357" class="LineNr">357 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='057immutable.cc.html#L438'>check_immutable_ingredient_in_instruction</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">,</span> caller<span class="Delimiter">);</span>
<span id="L358" class="LineNr">358 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == INDEX && <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> > <span class="Constant">1</span> && inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name == current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L359" class="LineNr">359 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='057immutable.cc.html#L364'>update_aliases</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">);</span>
<span id="L360" class="LineNr">360 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L361" class="LineNr">361 </span> <span class="Delimiter">}</span>
<span id="L362" class="LineNr">362 </span><span class="Delimiter">}</span>
<span id="L363" class="LineNr">363 </span>
<span id="L364" class="LineNr">364 </span><span class="Normal">void</span> <a href='057immutable.cc.html#L364'>update_aliases</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> set<reagent>& current_ingredient_and_aliases<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L365" class="LineNr">365 </span> set<<span class="Normal">int</span>> current_ingredient_indices = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
<span id="L366" class="LineNr">366 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L367" class="LineNr">367 </span> <span class="Conceal">¦</span> <span class="Comment">// primitive recipe</span>
<span id="L368" class="LineNr">368 </span> <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L369" class="LineNr">369 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>:
<span id="L370" class="LineNr">370 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L371" class="LineNr">371 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span id="L372" class="LineNr">372 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L373" class="LineNr">373 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> GET:
<span id="L374" class="LineNr">374 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> INDEX:
<span id="L375" class="LineNr">375 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> MAYBE_CONVERT:
<span id="L376" class="LineNr">376 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// current_ingredient_indices can only have 0 or one value</span>
<span id="L377" class="LineNr">377 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> && !inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L378" class="LineNr">378 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_exclusive_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
<span id="L379" class="LineNr">379 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
<span id="L380" class="LineNr">380 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L381" class="LineNr">381 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L382" class="LineNr">382 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">default</span>: <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L383" class="LineNr">383 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L384" class="LineNr">384 </span> <span class="Delimiter">}</span>
<span id="L385" class="LineNr">385 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L386" class="LineNr">386 </span> <span class="Conceal">¦</span> <span class="Comment">// defined recipe</span>
<span id="L387" class="LineNr">387 </span> <span class="Conceal">¦</span> set<<span class="Normal">int</span>> contained_in_product_indices = <a href='057immutable.cc.html#L395'>scan_contained_in_product_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_indices<span class="Delimiter">);</span>
<span id="L388" class="LineNr">388 </span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = contained_in_product_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != contained_in_product_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L389" class="LineNr">389 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*p < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
<span id="L390" class="LineNr">390 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
<span id="L391" class="LineNr">391 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L392" class="LineNr">392 </span> <span class="Delimiter">}</span>
<span id="L393" class="LineNr">393 </span><span class="Delimiter">}</span>
<span id="L394" class="LineNr">394 </span>
<span id="L395" class="LineNr">395 </span>set<<span class="Normal">int</span>> <a href='057immutable.cc.html#L395'>scan_contained_in_product_indices</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> set<<span class="Normal">int</span>>& <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L396" class="LineNr">396 </span> set<reagent> selected_ingredients<span class="Delimiter">;</span>
<span id="L397" class="LineNr">397 </span> <span class="Normal">const</span> recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
<span id="L398" class="LineNr">398 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L399" class="LineNr">399 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*p >= <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span>
<span id="L400" class="LineNr">400 </span> <span class="Conceal">¦</span> selected_ingredients<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
<span id="L401" class="LineNr">401 </span> <span class="Delimiter">}</span>
<span id="L402" class="LineNr">402 </span> set<<span class="Normal">int</span>> result<span class="Delimiter">;</span>
<span id="L403" class="LineNr">403 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L404" class="LineNr">404 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent& current_product = callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L405" class="LineNr">405 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> string_tree* contained_in_name = property<span class="Delimiter">(</span>current_product<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span>
<span id="L406" class="LineNr">406 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contained_in_name && selected_ingredients<span class="Delimiter">.</span>find<span class="Delimiter">(</span>contained_in_name<span class="Delimiter">-></span>value<span class="Delimiter">)</span> != selected_ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">())</span>
<span id="L407" class="LineNr">407 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L408" class="LineNr">408 </span> <span class="Delimiter">}</span>
<span id="L409" class="LineNr">409 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L410" class="LineNr">410 </span><span class="Delimiter">}</span>
<span id="L411" class="LineNr">411 </span>
<span id="L412" class="LineNr">412 </span><span class="Delimiter">:(scenarios transform)</span>
<span id="L413" class="LineNr">413 </span><span class="Delimiter">:(scenario immutability_infects_contained_in_variables)</span>
<span id="L414" class="LineNr">414 </span><span class="Special">% Hide_errors = true;</span>
<span id="L415" class="LineNr">415 </span><span class="muData">container</span> test-list [
<span id="L416" class="LineNr">416 </span> <span class="Normal">value</span>:num
<span id="L417" class="LineNr">417 </span> <span class="Normal">next</span>:&:test-list
<span id="L418" class="LineNr">418 </span>]
<span id="L419" class="LineNr">419 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L420" class="LineNr">420 </span> local-scope
<span id="L421" class="LineNr">421 </span> <span class="Normal">p</span>:&:test-list<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">test-list:type</span>
<span id="L422" class="LineNr">422 </span> foo p
<span id="L423" class="LineNr">423 </span>]
<span id="L424" class="LineNr">424 </span><span class="muRecipe">def</span> foo p:&:test-list [ <span class="Comment"># p is immutable</span>
<span id="L425" class="LineNr">425 </span> local-scope
<span id="L426" class="LineNr">426 </span> load-ingredients
<span id="L427" class="LineNr">427 </span> <span class="Normal">p2</span>:&:test-list<span class="Special"> <- </span>test-next p <span class="Comment"># p2 is immutable</span>
<span id="L428" class="LineNr">428 </span> *p2<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *p2<span class="Delimiter">,</span> <span class="Constant">value:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L429" class="LineNr">429 </span>]
<span id="L430" class="LineNr">430 </span><span class="muRecipe">def</span> test-next x:&:test-list<span class="muRecipe"> -> </span>y:&:test-list/contained-in:x [
<span id="L431" class="LineNr">431 </span> local-scope
<span id="L432" class="LineNr">432 </span> load-ingredients
<span id="L433" class="LineNr">433 </span> y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> <span class="Constant">next:offset</span>
<span id="L434" class="LineNr">434 </span>]
<span id="L435" class="LineNr">435 </span><span class="traceContains">+error: foo: cannot modify 'p2' in <a href='010vm.cc.html#L32'>instruction</a> '*p2 <- put *p2, value:offset, 34' because that would modify p which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> foo but not also a product</span>
<span id="L436" class="LineNr">436 </span>
<span id="L437" class="LineNr">437 </span><span class="Delimiter">:(code)</span>
<span id="L438" class="LineNr">438 </span><span class="Normal">void</span> <a href='057immutable.cc.html#L438'>check_immutable_ingredient_in_instruction</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> <span class="Normal">const</span> set<reagent>& current_ingredient_and_aliases<span class="Delimiter">,</span> <span class="Normal">const</span> string& original_ingredient_name<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L439" class="LineNr">439 </span> <span class="Comment">// first check if the instruction is directly modifying something it shouldn't</span>
<span id="L440" class="LineNr">440 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L441" class="LineNr">441 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">"lookup"</span><span class="Delimiter">)</span>
<span id="L442" class="LineNr">442 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> && current_ingredient_and_aliases<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != current_ingredient_and_aliases<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L443" class="LineNr">443 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> string current_product_name = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
<span id="L444" class="LineNr">444 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_product_name == original_ingredient_name<span class="Delimiter">)</span>
<span id="L445" class="LineNr">445 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_product_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L446" class="LineNr">446 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
<span id="L447" class="LineNr">447 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_product_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify "</span> << original_ingredient_name << <span class="Constant">" which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L448" class="LineNr">448 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L449" class="LineNr">449 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L450" class="LineNr">450 </span> <span class="Delimiter">}</span>
<span id="L451" class="LineNr">451 </span> <span class="Comment">// check if there's any indirect modification going on</span>
<span id="L452" class="LineNr">452 </span> set<<span class="Normal">int</span>> current_ingredient_indices = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
<span id="L453" class="LineNr">453 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// ingredient not found in call</span>
<span id="L454" class="LineNr">454 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>set<<span class="Normal">int</span>>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L455" class="LineNr">455 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> <span class="Normal">int</span> current_ingredient_index = *p<span class="Delimiter">;</span>
<span id="L456" class="LineNr">456 </span> <span class="Conceal">¦</span> reagent current_ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_ingredient_index<span class="Delimiter">);</span>
<span id="L457" class="LineNr">457 </span> <span class="Conceal">¦</span> canonize_type<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
<span id="L458" class="LineNr">458 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> string& current_ingredient_name = current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
<span id="L459" class="LineNr">459 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L460" class="LineNr">460 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// primitive recipe</span>
<span id="L461" class="LineNr">461 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// we got here only because we got an instruction with an implicit product, and the instruction didn't explicitly spell it out</span>
<span id="L462" class="LineNr">462 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// put x, y:offset, z</span>
<span id="L463" class="LineNr">463 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// instead of</span>
<span id="L464" class="LineNr">464 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// x <- put x, y:offset, z</span>
<span id="L465" class="LineNr">465 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == PUT || inst<span class="Delimiter">.</span>operation == PUT_INDEX<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L466" class="LineNr">466 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_index == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L467" class="LineNr">467 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
<span id="L468" class="LineNr">468 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L469" class="LineNr">469 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
<span id="L470" class="LineNr">470 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify '"</span> << original_ingredient_name << <span class="Constant">"' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L471" class="LineNr">471 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L472" class="LineNr">472 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L473" class="LineNr">473 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L474" class="LineNr">474 </span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L475" class="LineNr">475 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// defined recipe</span>
<span id="L476" class="LineNr">476 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L486'>is_modified_in_recipe</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">,</span> current_ingredient_index<span class="Delimiter">,</span> caller<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L477" class="LineNr">477 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
<span id="L478" class="LineNr">478 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because it's an ingredient of recipe "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L479" class="LineNr">479 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
<span id="L480" class="LineNr">480 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify '"</span> << current_ingredient_name << <span class="Constant">"' in <a href='010vm.cc.html#L32'>instruction</a> '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' because that would modify '"</span> << original_ingredient_name << <span class="Constant">"' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> "</span> << caller<span class="Delimiter">.</span>name << <span class="Constant">" but not also a product</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L481" class="LineNr">481 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L482" class="LineNr">482 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L483" class="LineNr">483 </span> <span class="Delimiter">}</span>
<span id="L484" class="LineNr">484 </span><span class="Delimiter">}</span>
<span id="L485" class="LineNr">485 </span>
<span id="L486" class="LineNr">486 </span><span class="Normal">bool</span> <a href='057immutable.cc.html#L486'>is_modified_in_recipe</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> ingredient_index<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L487" class="LineNr">487 </span> <span class="Normal">const</span> recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L488" class="LineNr">488 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L489" class="LineNr">489 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"can't check mutability of ingredients in recipe "</span> << callee<span class="Delimiter">.</span>name << <span class="Constant">" because it uses 'next-ingredient' directly, rather than a recipe header.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L490" class="LineNr">490 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L491" class="LineNr">491 </span> <span class="Delimiter">}</span>
<span id="L492" class="LineNr">492 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index >= <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span>
<span id="L493" class="LineNr">493 </span> <span class="Identifier">return</span> <a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span>callee<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span id="L494" class="LineNr">494 </span><span class="Delimiter">}</span>
<span id="L495" class="LineNr">495 </span>
<span id="L496" class="LineNr">496 </span><span class="Normal">bool</span> <a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe& callee<span class="Delimiter">,</span> <span class="Normal">const</span> string& ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L497" class="LineNr">497 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L498" class="LineNr">498 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
<span id="L499" class="LineNr">499 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L500" class="LineNr">500 </span> <span class="Delimiter">}</span>
<span id="L501" class="LineNr">501 </span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L502" class="LineNr">502 </span><span class="Delimiter">}</span>
<span id="L503" class="LineNr">503 </span>
<span id="L504" class="LineNr">504 </span>set<<span class="Normal">int</span>> <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction& inst<span class="Delimiter">,</span> <span class="Normal">const</span> set<reagent>& ingredient_names<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L505" class="LineNr">505 </span> set<<span class="Normal">int</span>> result<span class="Delimiter">;</span>
<span id="L506" class="LineNr">506 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L507" class="LineNr">507 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L508" class="LineNr">508 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != ingredient_names<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">())</span>
<span id="L509" class="LineNr">509 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L510" class="LineNr">510 </span> <span class="Delimiter">}</span>
<span id="L511" class="LineNr">511 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L512" class="LineNr">512 </span><span class="Delimiter">}</span>
<span id="L513" class="LineNr">513 </span>
<span id="L514" class="LineNr">514 </span><span class="Comment">//: Sometimes you want to pass in two addresses, one pointing inside the</span>
<span id="L515" class="LineNr">515 </span><span class="Comment">//: other. For example, you want to delete a node from a linked list. You</span>
<span id="L516" class="LineNr">516 </span><span class="Comment">//: can't pass both pointers back out, because if a caller tries to make both</span>
<span id="L517" class="LineNr">517 </span><span class="Comment">//: identical then you can't tell which value will be written on the way out.</span>
<span id="L518" class="LineNr">518 </span><span class="Comment">//:</span>
<span id="L519" class="LineNr">519 </span><span class="Comment">//: Experimental solution: just tell Mu that one points inside the other.</span>
<span id="L520" class="LineNr">520 </span><span class="Comment">//: This way we can return just one pointer as high up as necessary to capture</span>
<span id="L521" class="LineNr">521 </span><span class="Comment">//: all modifications performed by a recipe.</span>
<span id="L522" class="LineNr">522 </span><span class="Comment">//:</span>
<span id="L523" class="LineNr">523 </span><span class="Comment">//: We'll see if we end up wanting to abuse /contained-in for other reasons.</span>
<span id="L524" class="LineNr">524 </span>
<span id="L525" class="LineNr">525 </span><span class="Delimiter">:(scenarios transform)</span>
<span id="L526" class="LineNr">526 </span><span class="Delimiter">:(scenario can_modify_contained_in_addresses)</span>
<span id="L527" class="LineNr">527 </span><span class="muData">container</span> test-list [
<span id="L528" class="LineNr">528 </span> <span class="Normal">value</span>:num
<span id="L529" class="LineNr">529 </span> <span class="Normal">next</span>:&:test-list
<span id="L530" class="LineNr">530 </span>]
<span id="L531" class="LineNr">531 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L532" class="LineNr">532 </span> local-scope
<span id="L533" class="LineNr">533 </span> <span class="Normal">p</span>:&:test-list<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">test-list:type</span>
<span id="L534" class="LineNr">534 </span> foo p
<span id="L535" class="LineNr">535 </span>]
<span id="L536" class="LineNr">536 </span><span class="muRecipe">def</span> foo p:&:test-list<span class="muRecipe"> -> </span>p:&:test-list [
<span id="L537" class="LineNr">537 </span> local-scope
<span id="L538" class="LineNr">538 </span> load-ingredients
<span id="L539" class="LineNr">539 </span> <span class="Normal">p2</span>:&:test-list<span class="Special"> <- </span>test-next p
<span id="L540" class="LineNr">540 </span> p<span class="Special"> <- </span>test-remove p2<span class="Delimiter">,</span> p
<span id="L541" class="LineNr">541 </span>]
<span id="L542" class="LineNr">542 </span><span class="muRecipe">def</span> test-next x:&:test-list<span class="muRecipe"> -> </span>y:&:test-list [
<span id="L543" class="LineNr">543 </span> local-scope
<span id="L544" class="LineNr">544 </span> load-ingredients
<span id="L545" class="LineNr">545 </span> y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> <span class="Constant">next:offset</span>
<span id="L546" class="LineNr">546 </span>]
<span id="L547" class="LineNr">547 </span><span class="muRecipe">def</span> test-remove x:&:test-list/contained-in:from<span class="Delimiter">,</span> from:&:test-list<span class="muRecipe"> -> </span>from:&:test-list [
<span id="L548" class="LineNr">548 </span> local-scope
<span id="L549" class="LineNr">549 </span> load-ingredients
<span id="L550" class="LineNr">550 </span> *x<span class="Special"> <- </span><a href='001help.cc.html#L221'>put</a> *x<span class="Delimiter">,</span> <span class="Constant">value:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span> <span class="Comment"># can modify x</span>
<span id="L551" class="LineNr">551 </span>]
<span id="L552" class="LineNr">552 </span>$error: <span class="Constant">0</span>
<span id="L553" class="LineNr">553 </span>
<span id="L554" class="LineNr">554 </span><span class="Delimiter">:(before "End Immutable Ingredients Special-cases")</span>
<span id="L555" class="LineNr">555 </span><span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L556" class="LineNr">556 </span> <span class="Normal">const</span> string_tree* tmp = property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span>
<span id="L557" class="LineNr">557 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!tmp<span class="Delimiter">-></span>atom
<span id="L558" class="LineNr">558 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || <span class="Delimiter">(</span>!is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">)</span>
<span id="L559" class="LineNr">559 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> && !is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L560" class="LineNr">560 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"/contained-in can only point to another ingredient or product, but got '"</span> << to_string<span class="Delimiter">(</span>property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L561" class="LineNr">561 </span> <span class="Delimiter">}</span>
<span id="L562" class="LineNr">562 </span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L563" class="LineNr">563 </span><span class="Delimiter">}</span>
<span id="L564" class="LineNr">564 </span>
<span id="L565" class="LineNr">565 </span><span class="Delimiter">:(scenario contained_in_product)</span>
<span id="L566" class="LineNr">566 </span><span class="muData">container</span> test-list [
<span id="L567" class="LineNr">567 </span> <span class="Normal">value</span>:num
<span id="L568" class="LineNr">568 </span> <span class="Normal">next</span>:&:test-list
<span id="L569" class="LineNr">569 </span>]
<span id="L570" class="LineNr">570 </span><span class="muRecipe">def</span> foo x:&:test-list/contained-in:result<span class="muRecipe"> -> </span>result:&:test-list [
<span id="L571" class="LineNr">571 </span> local-scope
<span id="L572" class="LineNr">572 </span> load-ingredients
<span id="L573" class="LineNr">573 </span> result<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L574" class="LineNr">574 </span>]
<span id="L575" class="LineNr">575 </span>$error: <span class="Constant">0</span>
<span id="L576" class="LineNr">576 </span>
<span id="L577" class="LineNr">577 </span><span class="Delimiter">:(scenario contained_in_is_mutable)</span>
<span id="L578" class="LineNr">578 </span><span class="muData">container</span> test-list [
<span id="L579" class="LineNr">579 </span> <span class="Normal">value</span>:num
<span id="L580" class="LineNr">580 </span> <span class="Normal">next</span>:&:test-list
<span id="L581" class="LineNr">581 </span>]
<span id="L582" class="LineNr">582 </span><span class="muRecipe">def</span> foo x:&:test-list/contained-in:result<span class="muRecipe"> -> </span>result:&:test-list [
<span id="L583" class="LineNr">583 </span> local-scope
<span id="L584" class="LineNr">584 </span> load-ingredients
<span id="L585" class="LineNr">585 </span> result<span class="Special"> <- </span>copy x
<span id="L586" class="LineNr">586 </span> <a href='001help.cc.html#L221'>put</a> *x<span class="Delimiter">,</span> <span class="Constant">value:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
<span id="L587" class="LineNr">587 </span>]
<span id="L588" class="LineNr">588 </span>$error: <span class="Constant">0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|