about summary refs log tree commit diff stats
path: root/arc/charterm/doc.scrbl
Commit message (Expand)AuthorAgeFilesLines
* 1276 - make C++ version the defaultKartik K. Agaram2015-05-051-0/+7
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-19 00:22:47 +0000
3158' href='/akkartik/mu/commit/html/074deep_copy.cc.html?h=main&id=c842d90bbc5ab8f4fb88fb89ebb02c0c12051396'>c842d90b ^ 
298f8065 ^












3e1349d2 ^

298f8065 ^



3e1349d2 ^

298f8065 ^

3e1349d2 ^

70f4e9b6 ^

298f8065 ^
























3e1349d2 ^

298f8065 ^

f344b250 ^



298f8065 ^





3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^



f344b250 ^

298f8065 ^






3e1349d2 ^

298f8065 ^


f344b250 ^






298f8065 ^













3e1349d2 ^

298f8065 ^


f344b250 ^





298f8065 ^








3e1349d2 ^

298f8065 ^


f344b250 ^







298f8065 ^










3e1349d2 ^

298f8065 ^


f344b250 ^












298f8065 ^









3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^



f344b250 ^

3e1349d2 ^

f344b250 ^


298f8065 ^








3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^



f344b250 ^

3e1349d2 ^

f344b250 ^


298f8065 ^








3e1349d2 ^

f344b250 ^

298f8065 ^


3e1349d2 ^

f344b250 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^




f344b250 ^

3e1349d2 ^


f344b250 ^


298f8065 ^














c842d90b ^

298f8065 ^



c842d90b ^

298f8065 ^



c842d90b ^

298f8065 ^










d990e8f0 ^

298f8065 ^














































d990e8f0 ^

298f8065 ^


d990e8f0 ^

298f8065 ^












d059fe74 ^

298f8065 ^

d059fe74 ^

298f8065 ^



44c1aeef ^

298f8065 ^

















3e1349d2 ^

f344b250 ^

298f8065 ^

3e1349d2 ^

f344b250 ^

298f8065 ^

3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^



3e1349d2 ^



f344b250 ^

298f8065 ^




3e1349d2 ^

f344b250 ^

298f8065 ^

3e1349d2 ^

f344b250 ^

298f8065 ^

3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^

298f8065 ^



3e1349d2 ^




f344b250 ^

298f8065 ^




3e1349d2 ^

f344b250 ^


298f8065 ^

3e1349d2 ^

298f8065 ^

3e1349d2 ^



f344b250 ^

3e1349d2 ^


298f8065 ^

f344b250 ^


298f8065 ^










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




                                                                                          
                                   











                                                                                                 
                             


                              
                                  
                                                                           
                           
                               























                                                                                                         
                                        
             


                                                                                                                                                    




                                                                              
                                           

                                   
 
                                        


                                                                                                                                                                              
                                                                                                                                                    





                                                                                               
                                        

                                                                                                           





                                                                                                                                                                                                                                  












                                                                                                                          
                                        

                                                                                                           




                                                                                                                                                                                                                                      







                                                                       
                                        

                                                                                                           






                                                                                                                                                                                                                                                









                                                                                
                                        

                                                                                                           











                                                                                                                                                                                                                                      








                                                                           
                                           

                                         
 
                                        
             
                                                                                                                                                       


                                                                                                                                                
                                                                                                                                                    
                                                                                                                                                          

                                                                                                                                                      







                                                                                                     
                                                     

                                         
 
                                        
             
                                                                                                                                                       


                                                                                                                                                 
                                                                                                                                                    
                                                                                                                                                                                                                                        

                                                                                                                                                      







                                                                                                               
                                                     
                                   

                                                                          
                                           
                                         
 
                                        
             
                                                                                                                                                       



                                                                                                                                                
                                                                                                                                                    

                                                                                                                                                                                                                                 

                                                                                                                                                      













                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 


                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 


                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         









                                                                                                                                                                                                                                                                                                                                   
                                                                                                                                                                                       













































                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                           











                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                                                                                                                


                                                                                                       
                                                                                                                                                                                                                                                                                                                                                                                                                                                      
















                                                                                                                                                                                                                                                                                                                                                                              
                                            
                                         
 
                                            
                                          
 
                                                      

                                          
 
                                        
             
                                                                                                                                                      
                                                                             
                                                                                                                                                     
                                               
                                                                                                                                                     


                                                                                                                                                 


                                                                                                                                                                                                                                        
                                                                                    



                                                                  
                                            
                                         
 
                                            
                                          
 
                                                      

                                          
 
                                            

                                          
 
                                        
             
                                                                                                                                                      
                                                                             
                                                                                                                                                     
                                               
                                                                                                                                                     
                                               
                                                                                                                                                     


                                                                                                                                                



                                                                                                                                                                                                                                         
                                                                                    



                                                                 
                                           

                                         
 
                                        
             


                                                                                                                                                                                                      
                                                                                        

                                                                                                                                                           
                 

                                                                                                                                                                                                         









                                                                               
<!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 - 074deep_copy.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 12pt; font-size: 1em; }
.Constant { color: #00a0a0; }
.cSpecial { color: #008000; }
.muRecipe { color: #ff8700; }
.Comment { color: #9090ff; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.traceContains { color: #008000; }
.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
.muData { color: #ffff00; }
.Identifier { color: #c0a020; }
-->
</style>

<script type='text/javascript'>
<!--

-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">// To recursively copy containers and any addresses they contain, use</span>
<span class="Comment">// 'deep-copy'.</span>
<span class="Comment">//</span>
<span class="Comment">// Invariant: After a deep-copy its ingredient and result will point to no</span>
<span class="Comment">// common addresses.</span>
<span class="Comment">// Implications: Refcounts of all data pointed to by the original ingredient</span>
<span class="Comment">// will remain unchanged. Refcounts of all data pointed to by the (newly</span>
<span class="Comment">// created) result will be 1, in the absence of cycles.</span>
<span class="Comment">//</span>
<span class="Comment">// We do handle cycles in the ingredient, however. All cycles are translated</span>
<span class="Comment">// to new cycles in the product.</span>

<span class="Delimiter">:(scenario deep_copy_number)</span>
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">x</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Normal">y</span>:num<span class="Special"> &lt;- </span>deep-copy x
  <span class="Constant">10</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal x<span class="Delimiter">,</span> y
]
<span class="Comment"># non-address primitives are identical</span>
<span class="traceContains">+mem: storing 1 in location 10</span>

<span class="Delimiter">:(scenario deep_copy_container_without_address)</span>
<span class="muData">container</span> foo [
  <span class="Normal">x</span>:num
  <span class="Normal">y</span>:num
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">a</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
  <span class="Normal">b</span>:foo<span class="Special"> &lt;- </span>deep-copy a
  <span class="Constant">10</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal a<span class="Delimiter">,</span> b
]
<span class="Comment"># containers are identical as long as they don't contain addresses</span>
<span class="traceContains">+mem: storing 1 in location 10</span>

<span class="Delimiter">:(scenario deep_copy_address)</span>
<span class="Special">% Memory_allocated_until = 200;</span>
<span class="muRecipe">def</span> main [
  <span class="Comment"># avoid all memory allocations except the implicit ones inside deep-copy, so</span>
  <span class="Comment"># that the result is deterministic</span>
  <span class="Constant">1</span>:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">100</span>/unsafe  <span class="Comment"># pretend allocation</span>
  *<span class="Constant">1</span>:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Constant">2</span>:&amp;:num<span class="Special"> &lt;- </span>deep-copy <span class="Constant">1</span>:&amp;:num
  <span class="Constant">10</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:&amp;:num<span class="Delimiter">,</span> <span class="Constant">2</span>:&amp;:num
  <span class="Constant">11</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal *<span class="Constant">1</span>:&amp;:num<span class="Delimiter">,</span> *<span class="Constant">2</span>:&amp;:num
  <span class="Constant">2</span>:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="Comment"># the result of deep-copy is a new address</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># however, the contents are identical</span>
<span class="traceContains">+mem: storing 1 in location 11</span>
<span class="Comment"># the result of deep-copy gets a refcount of 1</span>
<span class="Comment"># (its address 202 = 200 base + 2 for temporary space inside deep-copy)</span>
<span class="traceContains">+run: {2: (&quot;address&quot; &quot;number&quot;)} &lt;- copy {0: &quot;literal&quot;}</span>
<span class="traceContains">+mem: decrementing refcount of 202: 1 -&gt; 0</span>
<span class="traceContains">+abandon: saving 202 in free-list of size 2</span>

<span class="Delimiter">:(scenario deep_copy_address_to_container)</span>
<span class="Special">% Memory_allocated_until = 200;</span>
<span class="muRecipe">def</span> main [
  <span class="Comment"># avoid all memory allocations except the implicit ones inside deep-copy, so</span>
  <span class="Comment"># that the result is deterministic</span>
  <span class="Constant">1</span>:&amp;:point<span class="Special"> &lt;- </span>copy <span class="Constant">100</span>/unsafe  <span class="Comment"># pretend allocation</span>
  *<span class="Constant">1</span>:&amp;:point<span class="Special"> &lt;- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
  <span class="Constant">2</span>:&amp;:point<span class="Special"> &lt;- </span>deep-copy <span class="Constant">1</span>:&amp;:point
  <span class="Constant">10</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:&amp;:point<span class="Delimiter">,</span> <span class="Constant">2</span>:&amp;:point
  <span class="Constant">11</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal *<span class="Constant">1</span>:&amp;:point<span class="Delimiter">,</span> *<span class="Constant">2</span>:&amp;:point
]
<span class="Comment"># the result of deep-copy is a new address</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># however, the contents are identical</span>
<span class="traceContains">+mem: storing 1 in location 11</span>

<span class="Delimiter">:(scenario deep_copy_address_to_address)</span>
<span class="Special">% Memory_allocated_until = 200;</span>
<span class="muRecipe">def</span> main [
  <span class="Comment"># avoid all memory allocations except the implicit ones inside deep-copy, so</span>
  <span class="Comment"># that the result is deterministic</span>
  <span class="Constant">1</span>:&amp;:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">100</span>/unsafe  <span class="Comment"># pretend allocation</span>
  *<span class="Constant">1</span>:&amp;:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">150</span>/unsafe
  **<span class="Constant">1</span>:&amp;:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Constant">2</span>:&amp;:&amp;:num<span class="Special"> &lt;- </span>deep-copy <span class="Constant">1</span>:&amp;:&amp;:num
  <span class="Constant">10</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:&amp;:&amp;:num<span class="Delimiter">,</span> <span class="Constant">2</span>:&amp;:&amp;:num
  <span class="Constant">11</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal *<span class="Constant">1</span>:&amp;:&amp;:num<span class="Delimiter">,</span> *<span class="Constant">2</span>:&amp;:&amp;:num
  <span class="Constant">12</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal **<span class="Constant">1</span>:&amp;:&amp;:num<span class="Delimiter">,</span> **<span class="Constant">2</span>:&amp;:&amp;:num
]
<span class="Comment"># the result of deep-copy is a new address</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># any addresses in it or pointed to it are also new</span>
<span class="traceContains">+mem: storing 0 in location 11</span>
<span class="Comment"># however, the non-address contents are identical</span>
<span class="traceContains">+mem: storing 1 in location 12</span>

<span class="Delimiter">:(scenario deep_copy_array)</span>
<span class="Special">% Memory_allocated_until = 200;</span>
<span class="muRecipe">def</span> main [
  <span class="Comment"># avoid all memory allocations except the implicit ones inside deep-copy, so</span>
  <span class="Comment"># that the result is deterministic</span>
  <span class="Constant">100</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>  <span class="Comment"># pretend refcount</span>
  <span class="Constant">101</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">3</span>  <span class="Comment"># pretend array length</span>
  <span class="Constant">1</span>:&amp;:@:num<span class="Special"> &lt;- </span>copy <span class="Constant">100</span>/unsafe  <span class="Comment"># pretend allocation</span>
  put-index *<span class="Constant">1</span>:&amp;:@:num<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
  put-index *<span class="Constant">1</span>:&amp;:@:num<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">35</span>
  put-index *<span class="Constant">1</span>:&amp;:@:num<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">36</span>
  stash [old:]<span class="Delimiter">,</span> *<span class="Constant">1</span>:&amp;:@:num
  <span class="Constant">2</span>:&amp;:@:num<span class="Special"> &lt;- </span>deep-copy <span class="Constant">1</span>:&amp;:@:num
  stash <span class="Constant">2</span>:&amp;:@:num
  stash [<span class="Normal">new</span>:]<span class="Delimiter">,</span> *<span class="Constant">2</span>:&amp;:@:num
  <span class="Constant">10</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:&amp;:@:num<span class="Delimiter">,</span> <span class="Constant">2</span>:&amp;:@:num
  <span class="Constant">11</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal *<span class="Constant">1</span>:&amp;:@:num<span class="Delimiter">,</span> *<span class="Constant">2</span>:&amp;:@:num
]
<span class="traceContains">+app: old: 3 34 35 36</span>
<span class="traceContains">+app: new: 3 34 35 36</span>
<span class="Comment"># the result of deep-copy is a new address</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># however, the contents are identical</span>
<span class="traceContains">+mem: storing 1 in location 11</span>

<span class="Delimiter">:(scenario deep_copy_container_with_address)</span>
<span class="muData">container</span> foo [
  <span class="Normal">x</span>:num
  <span class="Normal">y</span>:&amp;:num
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">y0</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
  *y0<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
  <span class="Normal">a</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> y0
  <span class="Normal">b</span>:foo<span class="Special"> &lt;- </span>deep-copy a
  <span class="Constant">10</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal a<span class="Delimiter">,</span> b
  <span class="Normal">y1</span>:&amp;:num<span class="Special"> &lt;- </span>get b<span class="Delimiter">,</span> <span class="Constant">y:offset</span>
  <span class="Constant">11</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal y0<span class="Delimiter">,</span> y1
  <span class="Constant">12</span>:num/<span class="Special">raw &lt;- </span>copy *y1
]
<span class="Comment"># containers containing addresses are not identical to their deep copies</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># the addresses they contain are not identical either</span>
<span class="traceContains">+mem: storing 0 in location 11</span>
<span class="traceContains">+mem: storing 35 in location 12</span>

<span class="Delimiter">:(scenario deep_copy_exclusive_container_with_address)</span>
<span class="muData">exclusive-container</span> foo [
  <span class="Normal">x</span>:num
  <span class="Normal">y</span>:&amp;:num
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">y0</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
  *y0<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Normal">a</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> y0
  <span class="Normal">b</span>:foo<span class="Special"> &lt;- </span>deep-copy a
  <span class="Constant">10</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal a<span class="Delimiter">,</span> b
  <span class="Normal">y1</span>:&amp;:num<span class="Delimiter">,</span> z:<span class="Normal">bool</span><span class="Special"> &lt;- </span>maybe-convert b<span class="Delimiter">,</span> <span class="Constant">y:variant</span>
  <span class="Constant">11</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal y0<span class="Delimiter">,</span> y1
  <span class="Constant">12</span>:num/<span class="Special">raw &lt;- </span>copy *y1
]
<span class="Comment"># exclusive containers containing addresses are not identical to their deep copies</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># the addresses they contain are not identical either</span>
<span class="traceContains">+mem: storing 0 in location 11</span>
<span class="traceContains">+mem: storing 34 in location 12</span>

<span class="Delimiter">:(scenario deep_copy_exclusive_container_with_container_with_address)</span>
<span class="muData">exclusive-container</span> foo [
  <span class="Normal">x</span>:num
  <span class="Normal">y</span>:bar  <span class="Comment"># inline</span>
]
<span class="muData">container</span> bar [
  <span class="Normal">x</span>:&amp;:num
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">y0</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
  *y0<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Normal">a</span>:bar<span class="Special"> &lt;- </span>merge y0
  <span class="Normal">b</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">1</span>/y<span class="Delimiter">,</span> a
  <span class="Normal">c</span>:foo<span class="Special"> &lt;- </span>deep-copy b
  <span class="Constant">10</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal b<span class="Delimiter">,</span> c
  <span class="Normal">d</span>:bar<span class="Delimiter">,</span> z:<span class="Normal">bool</span><span class="Special"> &lt;- </span>maybe-convert c<span class="Delimiter">,</span> <span class="Constant">y:variant</span>
  <span class="Normal">y1</span>:&amp;:num<span class="Special"> &lt;- </span>get d<span class="Delimiter">,</span> <span class="Constant">x:offset</span>
  <span class="Constant">11</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal y0<span class="Delimiter">,</span> y1
  <span class="Constant">12</span>:num/<span class="Special">raw &lt;- </span>copy *y1
]
<span class="Comment"># exclusive containers containing addresses are not identical to their deep copies</span>
<span class="traceContains">+mem: storing 0 in location 10</span>
<span class="Comment"># sub-containers containing addresses are not identical either</span>
<span class="traceContains">+mem: storing 0 in location 11</span>
<span class="traceContains">+mem: storing 34 in location 12</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
DEEP_COPY<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;deep-copy&quot;</span><span class="Delimiter">,</span> DEEP_COPY<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> DEEP_COPY: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><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 class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' requires its ingredient and product to be the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> DEEP_COPY: <span class="Delimiter">{</span>
  <span class="Normal">const</span> reagent&amp; input = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Comment">// allocate a tiny bit of temporary space for deep_copy()</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: allocating space for temporary&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  reagent tmp<span class="Delimiter">(</span><span class="Constant">&quot;tmp:address:number&quot;</span><span class="Delimiter">);</span>
  tmp<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>allocate<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">));</span>
  products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>deep_copy<span class="Delimiter">(</span>input<span class="Delimiter">,</span> tmp<span class="Delimiter">));</span>
  <span class="Comment">// reclaim Mu memory allocated for tmp</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: reclaiming temporary&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  abandon<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>value<span class="Delimiter">,</span> tmp<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> payload_size<span class="Delimiter">(</span>tmp<span class="Delimiter">));</span>
  <span class="Comment">// reclaim host memory allocated for tmp.type when tmp goes out of scope</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
vector&lt;<span class="Normal">double</span>&gt; deep_copy<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; in<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; tmp<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt; addresses_copied<span class="Delimiter">;</span>
  <span class="Identifier">return</span> deep_copy<span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

vector&lt;<span class="Normal">double</span>&gt; deep_copy<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> in<span class="Delimiter">,</span> map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; addresses_copied<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; tmp<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  canonize<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  vector&lt;<span class="Normal">double</span>&gt; result<span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>in<span class="Delimiter">))</span>
    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>deep_copy_address<span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">));</span>
  <span class="Normal">else</span>
    deep_copy<span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">,</span> result<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// deep-copy an address and return a new address</span>
<span class="Normal">int</span> deep_copy_address<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; canonized_in<span class="Delimiter">,</span> map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; addresses_copied<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; tmp<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>canonized_in<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> in_address = payload_address<span class="Delimiter">(</span>canonized_in<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copying address &quot;</span> &lt;&lt; in_address &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    <span class="Normal">int</span> out = get<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">);</span>
    trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copy already exists: &quot;</span> &lt;&lt; out &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span> out<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">int</span> out = allocate<span class="Delimiter">(</span>payload_size<span class="Delimiter">(</span>canonized_in<span class="Delimiter">));</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: new address is &quot;</span> &lt;&lt; out &lt;&lt; end<span class="Delimiter">();</span>
  put<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> payload = canonized_in<span class="Delimiter">;</span>
  payload<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;recursing on payload &quot;</span> &lt;&lt; payload<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">' '</span> &lt;&lt; to_string<span class="Delimiter">(</span>payload<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
  vector&lt;<span class="Normal">double</span>&gt; data = deep_copy<span class="Delimiter">(</span>payload<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: writing result &quot;</span> &lt;&lt; out &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Comment">// HACK: write_memory interface isn't ideal for this situation; we need</span>
  <span class="Comment">// a temporary location to help copy the payload.</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: writing temporary &quot;</span> &lt;&lt; tmp<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; out &lt;&lt; end<span class="Delimiter">();</span>
  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> tmp<span class="Delimiter">.</span>value<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  payload<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>value<span class="Delimiter">);</span>  <span class="Comment">// now modified for output</span>
  vector&lt;<span class="Normal">double</span>&gt; old_data = read_memory<span class="Delimiter">(</span>payload<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: really writing to &quot;</span> &lt;&lt; payload<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">' '</span> &lt;&lt; to_string<span class="Delimiter">(</span>payload<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; (old value &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>old_data<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; new value &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  write_memory<span class="Delimiter">(</span>payload<span class="Delimiter">,</span> data<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: output is &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Identifier">return</span> out<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// deep-copy a non-address and return a vector of locations</span>
<span class="Normal">void</span> deep_copy<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; canonized_in<span class="Delimiter">,</span> map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; addresses_copied<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; tmp<span class="Delimiter">,</span> vector&lt;<span class="Normal">double</span>&gt;&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>!is_mu_address<span class="Delimiter">(</span>canonized_in<span class="Delimiter">));</span>
  vector&lt;<span class="Normal">double</span>&gt; data = read_memory<span class="Delimiter">(</span>canonized_in<span class="Delimiter">);</span>
  out<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>out<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> data<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> data<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> canonized_in<span class="Delimiter">.</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: scanning for addresses in &quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Normal">const</span> container_metadata&amp; metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> canonized_in<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;set&lt;tag_condition_info&gt;<span class="Delimiter">,</span> set&lt;address_element_info&gt; &gt;::const_iterator p = metadata<span class="Delimiter">.</span>address<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != metadata<span class="Delimiter">.</span>address<span class="Delimiter">.</span>end<span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>end<span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// construct a fake reagent that reads directly from the appropriate</span>
      <span class="Comment">// field of the container</span>
      reagent curr<span class="Delimiter">;</span>
      curr<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">-&gt;</span>payload_type<span class="Delimiter">));</span>
      curr<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>canonized_in<span class="Delimiter">.</span>value + info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">);</span>
      curr<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
      trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copying address &quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>value &lt;&lt; end<span class="Delimiter">();</span>
      out<span class="Delimiter">.</span>at<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> = deep_copy_address<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Normal">int</span> payload_address<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
  canonize<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
  <span class="Identifier">return</span> x<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">//: moar tests, just because I can't believe it all works</span>

<span class="Delimiter">:(scenario deep_copy_stress_test_1)</span>
<span class="muData">container</span> foo1 [
  <span class="Normal">p</span>:&amp;:num
]
<span class="muData">container</span> foo2 [
  <span class="Normal">p</span>:&amp;:foo1
]
<span class="muData">exclusive-container</span> foo3 [
  <span class="Normal">p</span>:&amp;:foo1
  <span class="Normal">q</span>:&amp;:foo2
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">x</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
  *x<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Normal">a</span>:&amp;:foo1<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo1:type</span>
  *a<span class="Special"> &lt;- </span>merge x
  <span class="Normal">b</span>:&amp;:foo2<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo2:type</span>
  *b<span class="Special"> &lt;- </span>merge a
  <span class="Normal">c</span>:foo3<span class="Special"> &lt;- </span>merge <span class="Constant">1</span>/q<span class="Delimiter">,</span> b
  <span class="Normal">d</span>:foo3<span class="Special"> &lt;- </span>deep-copy c
  <span class="Normal">e</span>:&amp;:foo2<span class="Delimiter">,</span> z:<span class="Normal">bool</span><span class="Special"> &lt;- </span>maybe-convert d<span class="Delimiter">,</span> <span class="Constant">q:variant</span>
  <span class="Normal">f</span>:&amp;:foo1<span class="Special"> &lt;- </span>get *e<span class="Delimiter">,</span> <span class="Constant">p:offset</span>
  <span class="Normal">g</span>:&amp;:num<span class="Special"> &lt;- </span>get *f<span class="Delimiter">,</span> <span class="Constant">p:offset</span>
  <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>copy *g
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario deep_copy_stress_test_2)</span>
<span class="muData">container</span> foo1 [
  <span class="Normal">p</span>:&amp;:num
]
<span class="muData">container</span> foo2 [
  <span class="Normal">p</span>:&amp;:foo1
]
<span class="muData">exclusive-container</span> foo3 [
  <span class="Normal">p</span>:&amp;:foo1
  <span class="Normal">q</span>:&amp;:foo2
]
<span class="muData">container</span> foo4 [
  <span class="Normal">p</span>:num
  <span class="Normal">q</span>:&amp;:foo3
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">x</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
  *x<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Normal">a</span>:&amp;:foo1<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo1:type</span>
  *a<span class="Special"> &lt;- </span>merge x
  <span class="Normal">b</span>:&amp;:foo2<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo2:type</span>
  *b<span class="Special"> &lt;- </span>merge a
  <span class="Normal">c</span>:&amp;:foo3<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo3:type</span>
  *c<span class="Special"> &lt;- </span>merge <span class="Constant">1</span>/q<span class="Delimiter">,</span> b
  <span class="Normal">d</span>:foo4<span class="Special"> &lt;- </span>merge <span class="Constant">35</span><span class="Delimiter">,</span> c
  <span class="Normal">e</span>:foo4<span class="Special"> &lt;- </span>deep-copy d
  <span class="Normal">f</span>:&amp;:foo3<span class="Special"> &lt;- </span>get e<span class="Delimiter">,</span> <span class="Constant">q:offset</span>
  <span class="Normal">g</span>:&amp;:foo2<span class="Delimiter">,</span> z:<span class="Normal">bool</span><span class="Special"> &lt;- </span>maybe-convert *f<span class="Delimiter">,</span> <span class="Constant">q:variant</span>
  <span class="Normal">h</span>:&amp;:foo1<span class="Special"> &lt;- </span>get *g<span class="Delimiter">,</span> <span class="Constant">p:offset</span>
  <span class="Normal">y</span>:&amp;:num<span class="Special"> &lt;- </span>get *h<span class="Delimiter">,</span> <span class="Constant">p:offset</span>
  <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>copy *y
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario deep_copy_cycles)</span>
<span class="muData">container</span> foo [
  <span class="Normal">p</span>:num
  <span class="Normal">q</span>:&amp;:foo
]
<span class="muRecipe">def</span> main [
  local-scope
  <span class="Normal">x</span>:&amp;:foo<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">foo:type</span>
  *x<span class="Special"> &lt;- </span>put *x<span class="Delimiter">,</span> <span class="Constant">p:offset</span><span class="Delimiter">,</span> <span class="Constant">34</span>
  *x<span class="Special"> &lt;- </span>put *x<span class="Delimiter">,</span> <span class="Constant">q:offset</span><span class="Delimiter">,</span> x  <span class="Comment"># create a cycle</span>
  <span class="Normal">y</span>:&amp;:foo<span class="Special"> &lt;- </span>deep-copy x
  <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>get *y<span class="Delimiter">,</span> <span class="Constant">p:offset</span>
  <span class="Normal">y2</span>:&amp;:foo<span class="Special"> &lt;- </span>get *y<span class="Delimiter">,</span> <span class="Constant">q:offset</span>
  stash y [vs] y2
  <span class="Constant">2</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal y<span class="Delimiter">,</span> y2  <span class="Comment"># is it still a cycle?</span>
  <span class="Constant">3</span>:<span class="Normal">bool</span>/<span class="Special">raw &lt;- </span>equal x<span class="Delimiter">,</span> y  <span class="Comment"># is it the same cycle?</span>
]
<span class="traceContains">+mem: storing 34 in location 1</span>
<span class="Comment"># deep copy also contains a cycle</span>
<span class="traceContains">+mem: storing 1 in location 2</span>
<span class="Comment"># but it's a completely different (disjoint) cycle</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-19 00:22:48 +0000