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
|
<!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 - apps/handle.subx</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.subxComment { color: #005faf; }
.subxS2Comment { color: #8a8a8a; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.subxH1Comment { color: #005faf; text-decoration: underline; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.CommentedCode { color: #8a8a8a; }
.SpecialChar { color: #d70000; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
.subxMinorFunction { color: #875f5f; }
.Constant { color: #008787; }
.subxTest { color: #5f8700; }
-->
</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;
}
var 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();'>
<a href='https://github.com/akkartik/mu/blob/master/apps/handle.subx'>https://github.com/akkartik/mu/blob/master/apps/handle.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># A sketch of Mu-style handles or kinda-safe pointers, that add a modicum of</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># checking to dynamically allocated memory.</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># This approach avoids using 'allocate' directly in favor of two primitives:</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># - 'new', which allocates some space (the 'payload'), stores the address</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># along with an opaque 'alloc id' in a 'handle', and prepends the same</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># alloc id to the payload.</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># - 'lookup', which checks that the alloc id at the start of a handle matches</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># the alloc id at the start of the payload before returning the address.</span>
<span id="L10" class="LineNr"> 10 </span><span class="subxComment">#</span>
<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># Layout of a handle:</span>
<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># offset 0: alloc id</span>
<span id="L13" class="LineNr"> 13 </span><span class="subxComment"># offset 4: address</span>
<span id="L14" class="LineNr"> 14 </span><span class="subxComment">#</span>
<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># To run:</span>
<span id="L16" class="LineNr"> 16 </span><span class="subxComment"># $ ./subx translate init.linux 0*.subx apps/handle.subx -o apps/handle</span>
<span id="L17" class="LineNr"> 17 </span><span class="subxComment"># $ ./subx run apps/handle</span>
<span id="L18" class="LineNr"> 18 </span><span class="subxComment"># Expected result is a successful lookup followed by a hard abort:</span>
<span id="L19" class="LineNr"> 19 </span><span class="subxComment"># lookup succeeded</span>
<span id="L20" class="LineNr"> 20 </span><span class="subxComment"># lookup failed</span>
<span id="L21" class="LineNr"> 21 </span><span class="subxComment"># (This file is a prototype. The 'tests' in it aren't real; failures are</span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># expected.)</span>
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span>== code
<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L26" class="LineNr"> 26 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L27" class="LineNr"> 27 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L28" class="LineNr"> 28 </span>
<span id="L29" class="LineNr"> 29 </span><span class="SpecialChar">Entry</span>:
<span id="L30" class="LineNr"> 30 </span> <span class="subxComment"># initialize heap</span>
<span id="L31" class="LineNr"> 31 </span> <span class="subxS1Comment"># . Heap = new-segment(Heap-size)</span>
<span id="L32" class="LineNr"> 32 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L33" class="LineNr"> 33 </span> 68/push <span class="SpecialChar"><a href='../069allocate.subx.html#L22'>Heap</a></span>/imm32
<span id="L34" class="LineNr"> 34 </span> 68/push <span class="SpecialChar"><a href='../069allocate.subx.html#L29'>Heap-size</a></span>/imm32
<span id="L35" class="LineNr"> 35 </span> <span class="subxS2Comment"># . . call</span>
<span id="L36" class="LineNr"> 36 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32
<span id="L37" class="LineNr"> 37 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L38" class="LineNr"> 38 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span> e8/call run-tests/disp32 <span class="subxComment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
<span id="L41" class="LineNr"> 41 </span><span class="Constant">$handle-main:end</span>:
<span id="L42" class="LineNr"> 42 </span> <span class="subxComment"># syscall(exit, Num-test-failures)</span>
<span id="L43" class="LineNr"> 43 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx <span class="SpecialChar"><a href='../051test.subx.html#L90'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to ebx</span>
<span id="L44" class="LineNr"> 44 </span> b8/copy-to-eax 1/imm32/exit
<span id="L45" class="LineNr"> 45 </span> cd/syscall 0x80/imm8
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span><span class="subxFunction">new</span>: <span class="subxComment"># ad : (address allocation-descriptor), n : int, out : (address handle)</span>
<span id="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L49" class="LineNr"> 49 </span> 55/push-ebp
<span id="L50" class="LineNr"> 50 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L51" class="LineNr"> 51 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L52" class="LineNr"> 52 </span> 50/push-eax
<span id="L53" class="LineNr"> 53 </span> 51/push-ecx
<span id="L54" class="LineNr"> 54 </span> 52/push-edx
<span id="L55" class="LineNr"> 55 </span> <span class="subxComment"># ecx = n+4</span>
<span id="L56" class="LineNr"> 56 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+12) to ecx</span>
<span id="L57" class="LineNr"> 57 </span> 81 0/subop/add 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ecx</span>
<span id="L58" class="LineNr"> 58 </span> <span class="subxComment"># eax = allocate(ad, ecx)</span>
<span id="L59" class="LineNr"> 59 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L60" class="LineNr"> 60 </span> 51/push-ecx
<span id="L61" class="LineNr"> 61 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L62" class="LineNr"> 62 </span> <span class="subxS2Comment"># . . call</span>
<span id="L63" class="LineNr"> 63 </span> e8/call <a href='../069allocate.subx.html#L61'>allocate</a>/disp32
<span id="L64" class="LineNr"> 64 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L65" class="LineNr"> 65 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L66" class="LineNr"> 66 </span> <span class="subxComment"># edx = out</span>
<span id="L67" class="LineNr"> 67 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/edx 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+16) to edx</span>
<span id="L68" class="LineNr"> 68 </span> <span class="subxComment"># out->address = eax</span>
<span id="L69" class="LineNr"> 69 </span> 89/copy 1/mod/*+disp8 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy eax to *(edx+4)</span>
<span id="L70" class="LineNr"> 70 </span> <span class="subxComment"># if (eax == 0) out->alloc_id = 0, return</span>
<span id="L71" class="LineNr"> 71 </span> 3d/compare-eax-and 0/imm32
<span id="L72" class="LineNr"> 72 </span> 75/jump-if-not-equal $new:continue/disp8
<span id="L73" class="LineNr"> 73 </span> c7 0/subop/copy 0/mod/indirect 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/imm32 <span class="subxComment"># copy to *edx</span>
<span id="L74" class="LineNr"> 74 </span> eb/jump $new:end/disp8
<span id="L75" class="LineNr"> 75 </span><span class="Constant">$new:continue</span>:
<span id="L76" class="LineNr"> 76 </span> <span class="subxComment"># otherwise:</span>
<span id="L77" class="LineNr"> 77 </span> <span class="subxComment"># ecx = *Next-alloc-id</span>
<span id="L78" class="LineNr"> 78 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy *Next-alloc-id to ecx</span>
<span id="L79" class="LineNr"> 79 </span> <span class="subxComment"># *eax = *Next-alloc-id/ecx</span>
<span id="L80" class="LineNr"> 80 </span> 89/copy 0/mod/indirect 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ecx to *eax</span>
<span id="L81" class="LineNr"> 81 </span> <span class="subxComment"># out->alloc_id = *Next-alloc-id</span>
<span id="L82" class="LineNr"> 82 </span> 89/copy 0/mod/indirect 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ecx to *edx</span>
<span id="L83" class="LineNr"> 83 </span> <span class="subxComment"># increment *Next-alloc-id</span>
<span id="L84" class="LineNr"> 84 </span> ff 0/subop/increment 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># increment *Next-alloc-id</span>
<span id="L85" class="LineNr"> 85 </span><span class="Constant">$new:end</span>:
<span id="L86" class="LineNr"> 86 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L87" class="LineNr"> 87 </span> 5a/pop-to-edx
<span id="L88" class="LineNr"> 88 </span> 59/pop-to-ecx
<span id="L89" class="LineNr"> 89 </span> 58/pop-to-eax
<span id="L90" class="LineNr"> 90 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L91" class="LineNr"> 91 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L92" class="LineNr"> 92 </span> 5d/pop-to-ebp
<span id="L93" class="LineNr"> 93 </span> c3/return
<span id="L94" class="LineNr"> 94 </span>
<span id="L95" class="LineNr"> 95 </span><span class="subxTest">test-new</span>:
<span id="L96" class="LineNr"> 96 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L97" class="LineNr"> 97 </span> 55/push-ebp
<span id="L98" class="LineNr"> 98 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L99" class="LineNr"> 99 </span> <span class="subxComment"># var heap/edx : (address allocation-descriptor) = {0, 0}</span>
<span id="L100" class="LineNr">100 </span> 68/push 0/imm32/limit
<span id="L101" class="LineNr">101 </span> 68/push 0/imm32/curr
<span id="L102" class="LineNr">102 </span> 89/copy 3/mod/direct 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to edx</span>
<span id="L103" class="LineNr">103 </span> <span class="subxComment"># heap = new-segment(512)</span>
<span id="L104" class="LineNr">104 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L105" class="LineNr">105 </span> 52/push-edx
<span id="L106" class="LineNr">106 </span> 68/push 0x200/imm32
<span id="L107" class="LineNr">107 </span> <span class="subxS2Comment"># . . call</span>
<span id="L108" class="LineNr">108 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32
<span id="L109" class="LineNr">109 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L110" class="LineNr">110 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L111" class="LineNr">111 </span> <span class="subxComment"># *Next-alloc-id = 0x34</span>
<span id="L112" class="LineNr">112 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L113" class="LineNr">113 </span> <span class="subxComment"># var handle/ecx = {0, 0}</span>
<span id="L114" class="LineNr">114 </span> 68/push 0/imm32/address
<span id="L115" class="LineNr">115 </span> 68/push 0/imm32/alloc-id
<span id="L116" class="LineNr">116 </span> 89/copy 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ecx</span>
<span id="L117" class="LineNr">117 </span> <span class="subxComment"># new(heap, 2, handle/ecx)</span>
<span id="L118" class="LineNr">118 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L119" class="LineNr">119 </span> 51/push-ecx
<span id="L120" class="LineNr">120 </span> 68/push 2/imm32/size
<span id="L121" class="LineNr">121 </span> 52/push-edx
<span id="L122" class="LineNr">122 </span> <span class="subxS2Comment"># . . call</span>
<span id="L123" class="LineNr">123 </span> e8/call <a href='handle.subx.html#L47'>new</a>/disp32
<span id="L124" class="LineNr">124 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L125" class="LineNr">125 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L126" class="LineNr">126 </span> <span class="subxComment"># check-ints-equal(handle->alloc_id, 0x34, msg)</span>
<span id="L127" class="LineNr">127 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L128" class="LineNr">128 </span> 68/push <span class="Constant">"F - <a href='handle.subx.html#L95'>test-new</a>: alloc id of handle"</span>/imm32
<span id="L129" class="LineNr">129 </span> 68/push 0x34/imm32
<span id="L130" class="LineNr">130 </span> ff 6/subop/push 0/mod/indirect 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># push *ecx</span>
<span id="L131" class="LineNr">131 </span> <span class="subxS2Comment"># . . call</span>
<span id="L132" class="LineNr">132 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L133" class="LineNr">133 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L134" class="LineNr">134 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L135" class="LineNr">135 </span> <span class="subxComment"># check-ints-equal(*handle->address, 0x34, msg)</span>
<span id="L136" class="LineNr">136 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L137" class="LineNr">137 </span> 68/push <span class="Constant">"F - <a href='handle.subx.html#L95'>test-new</a>: alloc id of payload"</span>/imm32
<span id="L138" class="LineNr">138 </span> 68/push 0x34/imm32
<span id="L139" class="LineNr">139 </span> 8b/copy 1/mod/*+disp8 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/edx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ecx+4) to edx</span>
<span id="L140" class="LineNr">140 </span> ff 6/subop/push 0/mod/indirect 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># push *edx</span>
<span id="L141" class="LineNr">141 </span> <span class="subxS2Comment"># . . call</span>
<span id="L142" class="LineNr">142 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L143" class="LineNr">143 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L144" class="LineNr">144 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L145" class="LineNr">145 </span> <span class="subxComment"># check-ints-equal(*Next-alloc-id, 0x35)</span>
<span id="L146" class="LineNr">146 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L147" class="LineNr">147 </span> 68/push <span class="Constant">"F - <a href='handle.subx.html#L95'>test-new</a>: next alloc id"</span>/imm32
<span id="L148" class="LineNr">148 </span> 68/push 0x35/imm32
<span id="L149" class="LineNr">149 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L150" class="LineNr">150 </span> <span class="subxS2Comment"># . . call</span>
<span id="L151" class="LineNr">151 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L152" class="LineNr">152 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L153" class="LineNr">153 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L154" class="LineNr">154 </span> <span class="subxComment"># clean up</span>
<span id="L155" class="LineNr">155 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span>
<span id="L156" class="LineNr">156 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L157" class="LineNr">157 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L158" class="LineNr">158 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L159" class="LineNr">159 </span> 5d/pop-to-ebp
<span id="L160" class="LineNr">160 </span> c3/return
<span id="L161" class="LineNr">161 </span>
<span id="L162" class="LineNr">162 </span><span class="subxMinorFunction">_pending-test-new-failure</span>:
<span id="L163" class="LineNr">163 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L164" class="LineNr">164 </span> 55/push-ebp
<span id="L165" class="LineNr">165 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L166" class="LineNr">166 </span> <span class="subxS1Comment"># . *Next-alloc-id = 0x34</span>
<span id="L167" class="LineNr">167 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L168" class="LineNr">168 </span> <span class="subxComment"># define an allocation-descriptor with no space left</span>
<span id="L169" class="LineNr">169 </span> <span class="subxS1Comment"># . var ad/eax : (address allocation-descriptor) = {0x10, 0x10}</span>
<span id="L170" class="LineNr">170 </span> 68/push 0x10/imm32/limit
<span id="L171" class="LineNr">171 </span> 68/push 0x10/imm32/curr
<span id="L172" class="LineNr">172 </span> 89/copy 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to eax</span>
<span id="L173" class="LineNr">173 </span> <span class="subxS1Comment"># . var handle/ecx = {random, random}</span>
<span id="L174" class="LineNr">174 </span> 68/push 1234/imm32/address
<span id="L175" class="LineNr">175 </span> 68/push 5678/imm32/alloc-id
<span id="L176" class="LineNr">176 </span> 89/copy 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ecx</span>
<span id="L177" class="LineNr">177 </span> <span class="subxComment"># try to allocate</span>
<span id="L178" class="LineNr">178 </span> <span class="subxS1Comment"># . new(ad, 2, handle/ecx)</span>
<span id="L179" class="LineNr">179 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L180" class="LineNr">180 </span> 51/push-ecx
<span id="L181" class="LineNr">181 </span> 68/push 2/imm32/size
<span id="L182" class="LineNr">182 </span> 50/push-eax
<span id="L183" class="LineNr">183 </span> <span class="subxS2Comment"># . . call</span>
<span id="L184" class="LineNr">184 </span> e8/call <a href='handle.subx.html#L47'>new</a>/disp32
<span id="L185" class="LineNr">185 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L186" class="LineNr">186 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L187" class="LineNr">187 </span> <span class="subxComment"># handle should be cleared</span>
<span id="L188" class="LineNr">188 </span> <span class="subxS1Comment"># . check-ints-equal(handle->alloc_id, 0, msg)</span>
<span id="L189" class="LineNr">189 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L190" class="LineNr">190 </span> 68/push <span class="Constant">"F - test-new-failure: alloc id of handle"</span>/imm32
<span id="L191" class="LineNr">191 </span> 68/push 0/imm32
<span id="L192" class="LineNr">192 </span> ff 6/subop/push 0/mod/indirect 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># push *ecx</span>
<span id="L193" class="LineNr">193 </span> <span class="subxS2Comment"># . . call</span>
<span id="L194" class="LineNr">194 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L195" class="LineNr">195 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L196" class="LineNr">196 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L197" class="LineNr">197 </span> <span class="subxS1Comment"># . check-ints-equal(handle->address, 0, msg)</span>
<span id="L198" class="LineNr">198 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L199" class="LineNr">199 </span> 68/push <span class="Constant">"F - test-new-failure: address of handle"</span>/imm32
<span id="L200" class="LineNr">200 </span> 68/push 0/imm32
<span id="L201" class="LineNr">201 </span> ff 6/subop/push 1/mod/*+disp8 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ecx+4)</span>
<span id="L202" class="LineNr">202 </span> <span class="subxS2Comment"># . . call</span>
<span id="L203" class="LineNr">203 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L204" class="LineNr">204 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L205" class="LineNr">205 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L206" class="LineNr">206 </span> <span class="subxComment"># Next-alloc-id should be unmodified</span>
<span id="L207" class="LineNr">207 </span> <span class="subxS1Comment"># . check-ints-equal(*Next-alloc-id, 0x34)</span>
<span id="L208" class="LineNr">208 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L209" class="LineNr">209 </span> 68/push <span class="Constant">"F - test-new-failure: next alloc id"</span>/imm32
<span id="L210" class="LineNr">210 </span> 68/push 0x34/imm32
<span id="L211" class="LineNr">211 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L212" class="LineNr">212 </span> <span class="subxS2Comment"># . . call</span>
<span id="L213" class="LineNr">213 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L214" class="LineNr">214 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L215" class="LineNr">215 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L216" class="LineNr">216 </span> <span class="subxComment"># clean up</span>
<span id="L217" class="LineNr">217 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span>
<span id="L218" class="LineNr">218 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L219" class="LineNr">219 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L220" class="LineNr">220 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L221" class="LineNr">221 </span> 5d/pop-to-ebp
<span id="L222" class="LineNr">222 </span> c3/return
<span id="L223" class="LineNr">223 </span>
<span id="L224" class="LineNr">224 </span><span class="subxFunction">lookup</span>: <span class="subxComment"># h : (handle T) -> eax : (address T)</span>
<span id="L225" class="LineNr">225 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L226" class="LineNr">226 </span> 55/push-ebp
<span id="L227" class="LineNr">227 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L228" class="LineNr">228 </span> <span class="subxH1Comment"># - as a proof of concept for future inlining, uses no general-purpose registers besides the output (eax)</span>
<span id="L229" class="LineNr">229 </span> <span class="subxComment"># eax = handle</span>
<span id="L230" class="LineNr">230 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to eax</span>
<span id="L231" class="LineNr">231 </span> <span class="subxH1Comment"># - inline {</span>
<span id="L232" class="LineNr">232 </span> <span class="subxComment"># push handle->alloc_id</span>
<span id="L233" class="LineNr">233 </span> ff 6/subop/push 0/mod/indirect 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># push *eax</span>
<span id="L234" class="LineNr">234 </span> <span class="subxComment"># eax = handle->address (payload)</span>
<span id="L235" class="LineNr">235 </span> 8b/copy 1/mod/*+disp8 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(eax+4) to eax</span>
<span id="L236" class="LineNr">236 </span> <span class="subxComment"># push handle->address</span>
<span id="L237" class="LineNr">237 </span> 50/push-eax
<span id="L238" class="LineNr">238 </span> <span class="subxComment"># eax = payload->alloc_id</span>
<span id="L239" class="LineNr">239 </span> 8b/copy 0/mod/indirect 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *eax to eax</span>
<span id="L240" class="LineNr">240 </span> <span class="subxComment"># if (eax != handle->alloc_id) abort</span>
<span id="L241" class="LineNr">241 </span> 39/compare 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none <span class="Normal"> . </span> 0/r32/eax 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># compare *(esp+4) and eax</span>
<span id="L242" class="LineNr">242 </span> 75/jump-if-not-equal $lookup:abort/disp8
<span id="L243" class="LineNr">243 </span> <span class="subxComment"># eax = pop handle->address</span>
<span id="L244" class="LineNr">244 </span> 58/pop-to-eax
<span id="L245" class="LineNr">245 </span> <span class="subxComment"># discard handle->alloc_id</span>
<span id="L246" class="LineNr">246 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L247" class="LineNr">247 </span> <span class="subxComment"># add 4</span>
<span id="L248" class="LineNr">248 </span> 05/add-to-eax 4/imm32
<span id="L249" class="LineNr">249 </span> <span class="subxH1Comment"># - }</span>
<span id="L250" class="LineNr">250 </span> <span class="subxH1Comment"># - alternative consuming a second register {</span>
<span id="L251" class="LineNr">251 </span><span class="CommentedCode">#? # ecx = handle->alloc_id</span>
<span id="L252" class="LineNr">252 </span><span class="CommentedCode">#? 8b/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy *eax to ecx</span>
<span id="L253" class="LineNr">253 </span><span class="CommentedCode">#? # eax = handle->address (payload)</span>
<span id="L254" class="LineNr">254 </span><span class="CommentedCode">#? 8b/copy 1/mod/*+disp8 0/rm32/eax . . . 0/r32/eax 4/disp8 . # copy *(eax+4) to eax</span>
<span id="L255" class="LineNr">255 </span><span class="CommentedCode">#? # if (ecx != *eax) abort</span>
<span id="L256" class="LineNr">256 </span><span class="CommentedCode">#? 39/compare 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # compare *eax and ecx</span>
<span id="L257" class="LineNr">257 </span><span class="CommentedCode">#? 75/jump-if-not-equal $lookup:abort/disp8</span>
<span id="L258" class="LineNr">258 </span><span class="CommentedCode">#? # add 4 to eax</span>
<span id="L259" class="LineNr">259 </span><span class="CommentedCode">#? 05/add-to-eax 4/imm32</span>
<span id="L260" class="LineNr">260 </span> <span class="subxH1Comment"># - }</span>
<span id="L261" class="LineNr">261 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L262" class="LineNr">262 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L263" class="LineNr">263 </span> 5d/pop-to-ebp
<span id="L264" class="LineNr">264 </span> c3/return
<span id="L265" class="LineNr">265 </span>
<span id="L266" class="LineNr">266 </span><span class="Constant">$lookup:abort</span>:
<span id="L267" class="LineNr">267 </span> <span class="subxS1Comment"># . _write(2/stderr, msg)</span>
<span id="L268" class="LineNr">268 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L269" class="LineNr">269 </span> 68/push <span class="Constant">"lookup failed\n"</span>/imm32
<span id="L270" class="LineNr">270 </span> 68/push 2/imm32/stderr
<span id="L271" class="LineNr">271 </span> <span class="subxS2Comment"># . . call</span>
<span id="L272" class="LineNr">272 </span> e8/call <a href='../050_write.subx.html#L14'>_write</a>/disp32
<span id="L273" class="LineNr">273 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L274" class="LineNr">274 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L275" class="LineNr">275 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L276" class="LineNr">276 </span> bb/copy-to-ebx 1/imm32/exit-status
<span id="L277" class="LineNr">277 </span> b8/copy-to-eax 1/imm32/exit
<span id="L278" class="LineNr">278 </span> cd/syscall 0x80/imm8
<span id="L279" class="LineNr">279 </span>
<span id="L280" class="LineNr">280 </span><span class="subxTest">test-lookup-success</span>:
<span id="L281" class="LineNr">281 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L282" class="LineNr">282 </span> 55/push-ebp
<span id="L283" class="LineNr">283 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L284" class="LineNr">284 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L285" class="LineNr">285 </span> <span class="subxComment"># var heap/ebx : (address allocation-descriptor) = {0, 0}</span>
<span id="L286" class="LineNr">286 </span> 68/push 0/imm32/limit
<span id="L287" class="LineNr">287 </span> 68/push 0/imm32/curr
<span id="L288" class="LineNr">288 </span> 89/copy 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebx</span>
<span id="L289" class="LineNr">289 </span> <span class="subxComment"># heap = new-segment(512)</span>
<span id="L290" class="LineNr">290 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L291" class="LineNr">291 </span> 53/push-ebx
<span id="L292" class="LineNr">292 </span> 68/push 0x200/imm32
<span id="L293" class="LineNr">293 </span> <span class="subxS2Comment"># . . call</span>
<span id="L294" class="LineNr">294 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32
<span id="L295" class="LineNr">295 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L296" class="LineNr">296 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L297" class="LineNr">297 </span> <span class="subxComment"># var handle/ecx = {0, 0}</span>
<span id="L298" class="LineNr">298 </span> 68/push 0/imm32/address
<span id="L299" class="LineNr">299 </span> 68/push 0/imm32/alloc-id
<span id="L300" class="LineNr">300 </span> 89/copy 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ecx</span>
<span id="L301" class="LineNr">301 </span> <span class="subxComment"># var old_top/edx = heap->curr</span>
<span id="L302" class="LineNr">302 </span> 8b/copy 0/mod/indirect 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *ebx to edx</span>
<span id="L303" class="LineNr">303 </span> <span class="subxComment"># new(heap, 2, handle)</span>
<span id="L304" class="LineNr">304 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L305" class="LineNr">305 </span> 51/push-ecx
<span id="L306" class="LineNr">306 </span> 68/push 2/imm32/size
<span id="L307" class="LineNr">307 </span> 53/push-ebx
<span id="L308" class="LineNr">308 </span> <span class="subxS2Comment"># . . call</span>
<span id="L309" class="LineNr">309 </span> e8/call <a href='handle.subx.html#L47'>new</a>/disp32
<span id="L310" class="LineNr">310 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L311" class="LineNr">311 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L312" class="LineNr">312 </span> <span class="subxComment"># eax = lookup(handle)</span>
<span id="L313" class="LineNr">313 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L314" class="LineNr">314 </span> 51/push-ecx
<span id="L315" class="LineNr">315 </span> <span class="subxS2Comment"># . . call</span>
<span id="L316" class="LineNr">316 </span> e8/call <a href='handle.subx.html#L224'>lookup</a>/disp32
<span id="L317" class="LineNr">317 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L318" class="LineNr">318 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L319" class="LineNr">319 </span> <span class="subxComment"># eax contains old top of heap, except skipping the alloc id in the payload</span>
<span id="L320" class="LineNr">320 </span> <span class="subxS1Comment"># . check-ints-equal(eax, old_top+4, msg)</span>
<span id="L321" class="LineNr">321 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L322" class="LineNr">322 </span> 68/push <span class="Constant">"F - test-lookup-success"</span>/imm32
<span id="L323" class="LineNr">323 </span> 81 0/subop/add 3/mod/direct 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to edx</span>
<span id="L324" class="LineNr">324 </span> 52/push-edx
<span id="L325" class="LineNr">325 </span> 50/push-eax
<span id="L326" class="LineNr">326 </span> <span class="subxS2Comment"># . . call</span>
<span id="L327" class="LineNr">327 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L328" class="LineNr">328 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L329" class="LineNr">329 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L330" class="LineNr">330 </span> <span class="subxComment"># clean up</span>
<span id="L331" class="LineNr">331 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span>
<span id="L332" class="LineNr">332 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L333" class="LineNr">333 </span> <span class="subxComment"># write(2/stderr, "lookup succeeded\n")</span>
<span id="L334" class="LineNr">334 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L335" class="LineNr">335 </span> 68/push <span class="Constant">"lookup succeeded\n"</span>/imm32
<span id="L336" class="LineNr">336 </span> 68/push 2/imm32/stderr
<span id="L337" class="LineNr">337 </span> <span class="subxS2Comment"># . . call</span>
<span id="L338" class="LineNr">338 </span> e8/call <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L339" class="LineNr">339 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L340" class="LineNr">340 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L341" class="LineNr">341 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L342" class="LineNr">342 </span> 5a/pop-to-edx
<span id="L343" class="LineNr">343 </span> 59/pop-to-ecx
<span id="L344" class="LineNr">344 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L345" class="LineNr">345 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L346" class="LineNr">346 </span> 5d/pop-to-ebp
<span id="L347" class="LineNr">347 </span> c3/return
<span id="L348" class="LineNr">348 </span>
<span id="L349" class="LineNr">349 </span><span class="subxTest">test-lookup-failure</span>:
<span id="L350" class="LineNr">350 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L351" class="LineNr">351 </span> 55/push-ebp
<span id="L352" class="LineNr">352 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L353" class="LineNr">353 </span> <span class="subxComment"># var heap/esi : (address allocation-descriptor) = {0, 0}</span>
<span id="L354" class="LineNr">354 </span> 68/push 0/imm32/limit
<span id="L355" class="LineNr">355 </span> 68/push 0/imm32/curr
<span id="L356" class="LineNr">356 </span> 89/copy 3/mod/direct 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to esi</span>
<span id="L357" class="LineNr">357 </span> <span class="subxComment"># heap = new-segment(512)</span>
<span id="L358" class="LineNr">358 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L359" class="LineNr">359 </span> 56/push-esi
<span id="L360" class="LineNr">360 </span> 68/push 0x200/imm32
<span id="L361" class="LineNr">361 </span> <span class="subxS2Comment"># . . call</span>
<span id="L362" class="LineNr">362 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32
<span id="L363" class="LineNr">363 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L364" class="LineNr">364 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L365" class="LineNr">365 </span> <span class="subxComment"># var h1/ecx = {0, 0}</span>
<span id="L366" class="LineNr">366 </span> 68/push 0/imm32/address
<span id="L367" class="LineNr">367 </span> 68/push 0/imm32/alloc-id
<span id="L368" class="LineNr">368 </span> 89/copy 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ecx</span>
<span id="L369" class="LineNr">369 </span> <span class="subxComment"># var old_top/ebx = heap->curr</span>
<span id="L370" class="LineNr">370 </span> 8b/copy 0/mod/indirect 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *esi to ebx</span>
<span id="L371" class="LineNr">371 </span> <span class="subxComment"># first allocation, to h1</span>
<span id="L372" class="LineNr">372 </span> <span class="subxS1Comment"># . new(heap, 2, h1)</span>
<span id="L373" class="LineNr">373 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L374" class="LineNr">374 </span> 51/push-ecx
<span id="L375" class="LineNr">375 </span> 68/push 2/imm32/size
<span id="L376" class="LineNr">376 </span> 56/push-esi
<span id="L377" class="LineNr">377 </span> <span class="subxS2Comment"># . . call</span>
<span id="L378" class="LineNr">378 </span> e8/call <a href='handle.subx.html#L47'>new</a>/disp32
<span id="L379" class="LineNr">379 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L380" class="LineNr">380 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L381" class="LineNr">381 </span> <span class="subxComment"># reset heap->curr to mimic reclamation</span>
<span id="L382" class="LineNr">382 </span> 89/copy 0/mod/indirect 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebx to *esi</span>
<span id="L383" class="LineNr">383 </span> <span class="subxComment"># second allocation that returns the same address as the first</span>
<span id="L384" class="LineNr">384 </span> <span class="subxComment"># var h2/edx = {0, 0}</span>
<span id="L385" class="LineNr">385 </span> 68/push 0/imm32/address
<span id="L386" class="LineNr">386 </span> 68/push 0/imm32/alloc-id
<span id="L387" class="LineNr">387 </span> 89/copy 3/mod/direct 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to edx</span>
<span id="L388" class="LineNr">388 </span> <span class="subxS1Comment"># . new(heap, 2, h2)</span>
<span id="L389" class="LineNr">389 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L390" class="LineNr">390 </span> 52/push-edx
<span id="L391" class="LineNr">391 </span> 68/push 2/imm32/size
<span id="L392" class="LineNr">392 </span> 56/push-esi
<span id="L393" class="LineNr">393 </span> <span class="subxS2Comment"># . . call</span>
<span id="L394" class="LineNr">394 </span> e8/call <a href='handle.subx.html#L47'>new</a>/disp32
<span id="L395" class="LineNr">395 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L396" class="LineNr">396 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L397" class="LineNr">397 </span> <span class="subxComment"># check-ints-equal(h1->address, h2->address, msg)</span>
<span id="L398" class="LineNr">398 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L399" class="LineNr">399 </span> 68/push <span class="Constant">"F - test-lookup-failure"</span>/imm32
<span id="L400" class="LineNr">400 </span> ff 6/subop/push 1/mod/*+disp8 2/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(edx+4)</span>
<span id="L401" class="LineNr">401 </span> ff 6/subop/push 1/mod/*+disp8 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ecx+4)</span>
<span id="L402" class="LineNr">402 </span> <span class="subxS2Comment"># . . call</span>
<span id="L403" class="LineNr">403 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L404" class="LineNr">404 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L405" class="LineNr">405 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L406" class="LineNr">406 </span> <span class="subxComment"># lookup(h1) should crash</span>
<span id="L407" class="LineNr">407 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L408" class="LineNr">408 </span> 51/push-ecx
<span id="L409" class="LineNr">409 </span> <span class="subxS2Comment"># . . call</span>
<span id="L410" class="LineNr">410 </span> e8/call <a href='handle.subx.html#L224'>lookup</a>/disp32
<span id="L411" class="LineNr">411 </span> <span class="subxComment"># should never get past this point</span>
<span id="L412" class="LineNr">412 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L413" class="LineNr">413 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L414" class="LineNr">414 </span> <span class="subxComment"># clean up</span>
<span id="L415" class="LineNr">415 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span>
<span id="L416" class="LineNr">416 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L425'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span>
<span id="L417" class="LineNr">417 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L418" class="LineNr">418 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L419" class="LineNr">419 </span> 5d/pop-to-ebp
<span id="L420" class="LineNr">420 </span> c3/return
<span id="L421" class="LineNr">421 </span>
<span id="L422" class="LineNr">422 </span>== data
<span id="L423" class="LineNr">423 </span>
<span id="L424" class="LineNr">424 </span><span class="subxComment"># Monotonically increasing counter for calls to 'new'</span>
<span id="L425" class="LineNr">425 </span><span class="SpecialChar">Next-alloc-id</span>:
<span id="L426" class="LineNr">426 </span> 1/imm32
<span id="L427" class="LineNr">427 </span>
<span id="L428" class="LineNr">428 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|