html/apps/crenshaw2-1.subx.html


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
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-02 15:14:49 +0000
 

>394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626

<!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/crenshaw2-1.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; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.subxTest { color: #5f8700; }
.SpecialChar { color: #d70000; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
.Constant { color: #008787; }
.subxH1Comment { color: #005faf; text-decoration: underline; }
-->
</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/crenshaw2-1.subx'>https://github.com/akkartik/mu/blob/master/apps/crenshaw2-1.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Port of <a href="https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas">https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas</a></span>
<span id="L2" class="LineNr">  2 </span><span class="subxComment"># which corresponds to the section &quot;single digits&quot; in <a href="https://compilers.iecc.com/crenshaw/tutor2.txt">https://compilers.iecc.com/crenshaw/tutor2.txt</a></span>
<span id="L3" class="LineNr">  3 </span><span class="subxComment"># except that we support hex digits.</span>
<span id="L4" class="LineNr">  4 </span><span class="subxComment">#</span>
<span id="L5" class="LineNr">  5 </span><span class="subxComment"># To run:</span>
<span id="L6" class="LineNr">  6 </span><span class="subxComment">#   $ ./subx translate init.linux 0*.subx apps/crenshaw2-1.subx -o apps/crenshaw2-1</span>
<span id="L7" class="LineNr">  7 </span><span class="subxComment">#   $ echo '3'  |./subx run apps/crenshaw2-1</span>
<span id="L8" class="LineNr">  8 </span><span class="subxComment"># Expected output:</span>
<span id="L9" class="LineNr">  9 </span><span class="subxComment">#   # syscall(exit, 3)</span>
<span id="L10" class="LineNr"> 10 </span><span class="subxComment">#   bb/copy-to-ebx  3/imm32</span>
<span id="L11" class="LineNr"> 11 </span><span class="subxComment">#   b8/copy-to-eax  1/imm32/exit</span>
<span id="L12" class="LineNr"> 12 </span><span class="subxComment">#   cd/syscall  0x80/imm8</span>
<span id="L13" class="LineNr"> 13 </span><span class="subxComment">#</span>
<span id="L14" class="LineNr"> 14 </span><span class="subxComment"># To run the generated output:</span>
<span id="L15" class="LineNr"> 15 </span><span class="subxComment">#   $ echo '3'  |./subx run apps/crenshaw2-1 &gt; z1.subx</span>
<span id="L16" class="LineNr"> 16 </span><span class="subxComment">#   $ ./subx translate init.linux z1.subx -o z1</span>
<span id="L17" class="LineNr"> 17 </span><span class="subxComment">#   $ ./subx run z1</span>
<span id="L18" class="LineNr"> 18 </span><span class="subxComment">#   $ echo $?</span>
<span id="L19" class="LineNr"> 19 </span><span class="subxComment">#   3</span>
<span id="L20" class="LineNr"> 20 </span><span class="subxComment">#</span>
<span id="L21" class="LineNr"> 21 </span><span class="subxComment"># Stdin must contain just a single hex digit. Other input will print an error:</span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment">#   $ echo 'xyz'  |./subx run apps/crenshaw2-1</span>
<span id="L23" class="LineNr"> 23 </span><span class="subxComment">#   Error: integer expected</span>
<span id="L24" class="LineNr"> 24 </span><span class="subxComment">#</span>
<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># Names in this file sometimes follow Crenshaw's original rather than my usual</span>
<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># naming conventions.</span>
<span id="L27" class="LineNr"> 27 </span>
<span id="L28" class="LineNr"> 28 </span>== code
<span id="L29" class="LineNr"> 29 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L30" class="LineNr"> 30 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L31" class="LineNr"> 31 </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="L32" class="LineNr"> 32 </span>
<span id="L33" class="LineNr"> 33 </span><span class="SpecialChar">Entry</span>:  <span class="subxComment"># run tests if necessary, call 'compile' if not</span>
<span id="L34" class="LineNr"> 34 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L35" class="LineNr"> 35 </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="L36" class="LineNr"> 36 </span>
<span id="L37" class="LineNr"> 37 </span>    <span class="subxComment"># initialize heap</span>
<span id="L38" class="LineNr"> 38 </span>    <span class="subxS1Comment"># . Heap = new-segment(Heap-size)</span>
<span id="L39" class="LineNr"> 39 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L40" class="LineNr"> 40 </span>    68/push  <span class="SpecialChar"><a href='../069allocate.subx.html#L22'>Heap</a></span>/imm32
<span id="L41" class="LineNr"> 41 </span>    68/push  <span class="SpecialChar"><a href='../069allocate.subx.html#L29'>Heap-size</a></span>/imm32
<span id="L42" class="LineNr"> 42 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L43" class="LineNr"> 43 </span>    e8/call  <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32
<span id="L44" class="LineNr"> 44 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L45" class="LineNr"> 45 </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="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span>    <span class="subxH1Comment"># - if argc &gt; 1 and argv[1] == &quot;test&quot;, then return run_tests()</span>
<span id="L48" class="LineNr"> 48 </span>    <span class="subxComment"># if (argc &lt;= 1) goto run-main</span>
<span id="L49" class="LineNr"> 49 </span>    81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0/disp8         1/imm32           <span class="subxComment"># compare *ebp</span>
<span id="L50" class="LineNr"> 50 </span>    7e/jump-if-lesser-or-equal  $run-main/disp8
<span id="L51" class="LineNr"> 51 </span>    <span class="subxComment"># if (!kernel-string-equal?(argv[1], &quot;test&quot;)) goto run-main</span>
<span id="L52" class="LineNr"> 52 </span>    <span class="subxS1Comment"># . eax = kernel-string-equal?(argv[1], &quot;test&quot;)</span>
<span id="L53" class="LineNr"> 53 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L54" class="LineNr"> 54 </span>    68/push  <span class="Constant">&quot;test&quot;</span>/imm32
<span id="L55" class="LineNr"> 55 </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="L56" class="LineNr"> 56 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L57" class="LineNr"> 57 </span>    e8/call  <a href='../052kernel-string-equal.subx.html#L31'>kernel-string-equal?</a>/disp32
<span id="L58" class="LineNr"> 58 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L59" class="LineNr"> 59 </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="L60" class="LineNr"> 60 </span>    <span class="subxS1Comment"># . if (eax == 0) goto run-main</span>
<span id="L61" class="LineNr"> 61 </span>    3d/compare-eax-and  0/imm32
<span id="L62" class="LineNr"> 62 </span>    74/jump-if-equal  $run-main/disp8
<span id="L63" class="LineNr"> 63 </span>    <span class="subxComment"># run-tests()</span>
<span id="L64" class="LineNr"> 64 </span>    e8/call  run-tests/disp32
<span id="L65" class="LineNr"> 65 </span>    <span class="subxComment"># syscall(exit, *Num-test-failures)</span>
<span id="L66" class="LineNr"> 66 </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="L67" class="LineNr"> 67 </span>    eb/jump  $main:end/disp8
<span id="L68" class="LineNr"> 68 </span><span class="Constant">$run-main</span>:
<span id="L69" class="LineNr"> 69 </span>    <span class="subxH1Comment"># - otherwise read a program from stdin and emit its translation to stdout</span>
<span id="L70" class="LineNr"> 70 </span>    <span class="subxComment"># var ed/eax : exit-descriptor</span>
<span id="L71" class="LineNr"> 71 </span>    81          5/subop/subtract    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"># subtract from esp</span>
<span id="L72" class="LineNr"> 72 </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="L73" class="LineNr"> 73 </span>    <span class="subxComment"># configure ed to really exit()</span>
<span id="L74" class="LineNr"> 74 </span>    <span class="subxS1Comment"># . ed-&gt;target = 0</span>
<span id="L75" class="LineNr"> 75 </span>    c7          0/subop/copy        0/mod/direct    0/rm32/eax   <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 *eax</span>
<span id="L76" class="LineNr"> 76 </span>    <span class="subxComment"># compile(Stdin, 1/stdout, 2/stderr, ed)</span>
<span id="L77" class="LineNr"> 77 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L78" class="LineNr"> 78 </span>    50/push-eax/ed
<span id="L79" class="LineNr"> 79 </span>    68/push  2/imm32/stderr
<span id="L80" class="LineNr"> 80 </span>    68/push  1/imm32/stdout
<span id="L81" class="LineNr"> 81 </span>    68/push  <span class="SpecialChar"><a href='../061read-byte.subx.html#L14'>Stdin</a></span>/imm32
<span id="L82" class="LineNr"> 82 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L83" class="LineNr"> 83 </span>    e8/call  <a href='crenshaw2-1.subx.html#L93'>compile</a>/disp32
<span id="L84" class="LineNr"> 84 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L85" class="LineNr"> 85 </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>              0x10/imm32        <span class="subxComment"># add to esp</span>
<span id="L86" class="LineNr"> 86 </span>    <span class="subxComment"># syscall(exit, 0)</span>
<span id="L87" class="LineNr"> 87 </span>    bb/copy-to-ebx  0/imm32
<span id="L88" class="LineNr"> 88 </span><span class="Constant">$main:end</span>:
<span id="L89" class="LineNr"> 89 </span>    b8/copy-to-eax  1/imm32/exit
<span id="L90" class="LineNr"> 90 </span>    cd/syscall  0x80/imm8
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="subxComment"># the main entry point</span>
<span id="L93" class="LineNr"> 93 </span><span class="subxFunction">compile</span>:  <span class="subxComment"># in : (address buffered-file), out : fd or (address stream), err : fd or (address stream), ed : (address exit-descriptor)</span>
<span id="L94" class="LineNr"> 94 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L95" class="LineNr"> 95 </span>    55/push-ebp
<span id="L96" class="LineNr"> 96 </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="L97" class="LineNr"> 97 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L98" class="LineNr"> 98 </span>    50/push-eax
<span id="L99" class="LineNr"> 99 </span>    51/push-ecx
<span id="L100" class="LineNr">100 </span>    <span class="subxComment"># prime the pump</span>
<span id="L101" class="LineNr">101 </span>    <span class="subxS1Comment"># . Look = get-char(in)</span>
<span id="L102" class="LineNr">102 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L103" class="LineNr">103 </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="L104" class="LineNr">104 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L105" class="LineNr">105 </span>    e8/call  <a href='crenshaw2-1.subx.html#L513'>get-char</a>/disp32
<span id="L106" class="LineNr">106 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L107" class="LineNr">107 </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="L108" class="LineNr">108 </span>    <span class="subxComment"># var num/ecx : (address stream) on the stack</span>
<span id="L109" class="LineNr">109 </span>    <span class="subxComment"># Numbers can be 32 bits or 8 hex bytes long. One of them will be in 'Look', so we need space for 7 bytes.</span>
<span id="L110" class="LineNr">110 </span>    <span class="subxComment"># Sizing the stream just right buys us overflow-handling for free inside 'get-num'.</span>
<span id="L111" class="LineNr">111 </span>    <span class="subxComment"># Add 12 bytes for 'read', 'write' and 'length' fields, for a total of 19 bytes, or 0x13 in hex.</span>
<span id="L112" class="LineNr">112 </span>    <span class="subxComment"># The stack pointer is no longer aligned, so dump_stack() can be misleading past this point.</span>
<span id="L113" class="LineNr">113 </span>    81          5/subop/subtract    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>              0x13/imm32        <span class="subxComment"># subtract from esp</span>
<span id="L114" class="LineNr">114 </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="L115" class="LineNr">115 </span>    <span class="subxComment"># initialize the stream</span>
<span id="L116" class="LineNr">116 </span>    <span class="subxS1Comment"># . num-&gt;length = 7</span>
<span id="L117" class="LineNr">117 </span>    c7          0/subop/copy        1/mod/*+disp8   1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8         7/imm32           <span class="subxComment"># copy to *(ecx+8)</span>
<span id="L118" class="LineNr">118 </span>    <span class="subxS1Comment"># . clear-stream(num)</span>
<span id="L119" class="LineNr">119 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L120" class="LineNr">120 </span>    51/push-ecx
<span id="L121" class="LineNr">121 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L122" class="LineNr">122 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L123" class="LineNr">123 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L124" class="LineNr">124 </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="L125" class="LineNr">125 </span>    <span class="subxComment"># read a digit from 'in' into 'num'</span>
<span id="L126" class="LineNr">126 </span>    <span class="subxS1Comment"># . get-num(in, num, err, ed)</span>
<span id="L127" class="LineNr">127 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L128" class="LineNr">128 </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>          0x14/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+20)</span>
<span id="L129" class="LineNr">129 </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>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L130" class="LineNr">130 </span>    51/push-ecx/num
<span id="L131" class="LineNr">131 </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="L132" class="LineNr">132 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L133" class="LineNr">133 </span>    e8/call  <a href='crenshaw2-1.subx.html#L193'>get-num</a>/disp32
<span id="L134" class="LineNr">134 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L135" class="LineNr">135 </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>              0x10/imm32        <span class="subxComment"># add to esp</span>
<span id="L136" class="LineNr">136 </span>    <span class="subxComment"># render 'num' into the following template on 'out':</span>
<span id="L137" class="LineNr">137 </span>    <span class="subxComment">#   bb/copy-to-ebx  _num_</span>
<span id="L138" class="LineNr">138 </span>    <span class="subxComment">#   b8/copy-to-eax  1/imm32/exit</span>
<span id="L139" class="LineNr">139 </span>    <span class="subxComment">#   cd/syscall  0x80/imm8</span>
<span id="L140" class="LineNr">140 </span>    <span class="subxComment">#</span>
<span id="L141" class="LineNr">141 </span>    <span class="subxS1Comment"># . write(out, &quot;bb/copy-to-ebx  &quot;)</span>
<span id="L142" class="LineNr">142 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L143" class="LineNr">143 </span>    68/push  <span class="Constant">&quot;bb/copy-to-ebx  &quot;</span>/imm32
<span id="L144" class="LineNr">144 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L145" class="LineNr">145 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L146" class="LineNr">146 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L147" class="LineNr">147 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L148" class="LineNr">148 </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="L149" class="LineNr">149 </span>    <span class="subxS1Comment"># . write-stream(out, num)</span>
<span id="L150" class="LineNr">150 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L151" class="LineNr">151 </span>    51/push-ecx/num
<span id="L152" class="LineNr">152 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L153" class="LineNr">153 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L154" class="LineNr">154 </span>    e8/call  <a href='../062write-stream.subx.html#L18'>write-stream</a>/disp32
<span id="L155" class="LineNr">155 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L156" class="LineNr">156 </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="L157" class="LineNr">157 </span>    <span class="subxS1Comment"># . write(out, Newline)</span>
<span id="L158" class="LineNr">158 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L159" class="LineNr">159 </span>    68/push  <span class="SpecialChar"><a href='../051test.subx.html#L83'>Newline</a></span>/imm32
<span id="L160" class="LineNr">160 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L161" class="LineNr">161 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L162" class="LineNr">162 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L163" class="LineNr">163 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L164" class="LineNr">164 </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="L165" class="LineNr">165 </span>    <span class="subxS1Comment"># . write(out, &quot;b8/copy-to-eax  1/imm32/exit\n&quot;)</span>
<span id="L166" class="LineNr">166 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L167" class="LineNr">167 </span>    68/push  <span class="Constant">&quot;b8/copy-to-eax  1/imm32/exit\n&quot;</span>/imm32
<span id="L168" class="LineNr">168 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L169" class="LineNr">169 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L170" class="LineNr">170 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L171" class="LineNr">171 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L172" class="LineNr">172 </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="L173" class="LineNr">173 </span>    <span class="subxS1Comment"># . write(out, &quot;cd/syscall  0x80/imm8\n&quot;)</span>
<span id="L174" class="LineNr">174 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L175" class="LineNr">175 </span>    68/push  <span class="Constant">&quot;cd/syscall  0x80/imm8\n&quot;</span>/imm32
<span id="L176" class="LineNr">176 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L177" class="LineNr">177 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L178" class="LineNr">178 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L179" class="LineNr">179 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L180" class="LineNr">180 </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="L181" class="LineNr">181 </span><span class="Constant">$compile:end</span>:
<span id="L182" class="LineNr">182 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L183" class="LineNr">183 </span>    59/pop-to-ecx
<span id="L184" class="LineNr">184 </span>    58/pop-to-eax
<span id="L185" class="LineNr">185 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L186" class="LineNr">186 </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="L187" class="LineNr">187 </span>    5d/pop-to-ebp
<span id="L188" class="LineNr">188 </span>    c3/return
<span id="L189" class="LineNr">189 </span>
<span id="L190" class="LineNr">190 </span><span class="subxComment"># Read a single digit into 'out'. Abort if there are none, or if there is no space in 'out'.</span>
<span id="L191" class="LineNr">191 </span><span class="subxComment"># Input comes from the global variable 'Look', and we leave the next byte from</span>
<span id="L192" class="LineNr">192 </span><span class="subxComment"># 'in' into it on exit.</span>
<span id="L193" class="LineNr">193 </span><span class="subxFunction">get-num</span>:  <span class="subxComment"># in : (address buffered-file), out : (address stream), err : fd or (address stream), ed : (address exit-descriptor)</span>
<span id="L194" class="LineNr">194 </span>    <span class="subxComment"># pseudocode:</span>
<span id="L195" class="LineNr">195 </span>    <span class="subxComment">#   if (!is-digit?(Look)) expected(ed, err, &quot;integer&quot;)</span>
<span id="L196" class="LineNr">196 </span>    <span class="subxComment">#   if out-&gt;write &gt;= out-&gt;length</span>
<span id="L197" class="LineNr">197 </span>    <span class="subxComment">#     write(err, &quot;Error: too many digits in number\n&quot;)</span>
<span id="L198" class="LineNr">198 </span>    <span class="subxComment">#     stop(ed, 1)</span>
<span id="L199" class="LineNr">199 </span>    <span class="subxComment">#   out-&gt;data[out-&gt;write] = LSB(Look)</span>
<span id="L200" class="LineNr">200 </span>    <span class="subxComment">#   ++out-&gt;write</span>
<span id="L201" class="LineNr">201 </span>    <span class="subxComment">#   Look = get-char(in)</span>
<span id="L202" class="LineNr">202 </span>    <span class="subxComment">#</span>
<span id="L203" class="LineNr">203 </span>    <span class="subxComment"># registers:</span>
<span id="L204" class="LineNr">204 </span>    <span class="subxComment">#   in: esi</span>
<span id="L205" class="LineNr">205 </span>    <span class="subxComment">#   out: edi</span>
<span id="L206" class="LineNr">206 </span>    <span class="subxComment">#   out-&gt;write: ecx (cached copy; need to keep in sync)</span>
<span id="L207" class="LineNr">207 </span>    <span class="subxComment">#   out-&gt;length: edx</span>
<span id="L208" class="LineNr">208 </span>    <span class="subxComment">#   temporaries: eax, ebx</span>
<span id="L209" class="LineNr">209 </span>    <span class="subxComment"># We can't allocate Look to a register because it gets written implicitly in</span>
<span id="L210" class="LineNr">210 </span>    <span class="subxComment"># get-char in each iteration of the loop. (Thereby demonstrating that it's</span>
<span id="L211" class="LineNr">211 </span>    <span class="subxComment"># not the right interface for us. But we'll keep it just to follow Crenshaw.)</span>
<span id="L212" class="LineNr">212 </span>    <span class="subxComment">#</span>
<span id="L213" class="LineNr">213 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L214" class="LineNr">214 </span>    55/push-ebp
<span id="L215" class="LineNr">215 </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="L216" class="LineNr">216 </span>    <span class="subxH1Comment"># - if (is-digit?(Look)) expected(ed, err, &quot;integer&quot;)</span>
<span id="L217" class="LineNr">217 </span>    <span class="subxS1Comment"># . eax = is-digit?(Look)</span>
<span id="L218" class="LineNr">218 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L219" class="LineNr">219 </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='crenshaw2-1.subx.html#L558'>Look</a></span>/disp32    <span class="Normal"> . </span>                <span class="subxComment"># push *Look</span>
<span id="L220" class="LineNr">220 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L221" class="LineNr">221 </span>    e8/call  <a href='crenshaw2-1.subx.html#L536'>is-digit?</a>/disp32
<span id="L222" class="LineNr">222 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L223" class="LineNr">223 </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="L224" class="LineNr">224 </span>    <span class="subxS1Comment"># . if (eax == 0)</span>
<span id="L225" class="LineNr">225 </span>    3d/compare-eax-and  0/imm32
<span id="L226" class="LineNr">226 </span>    75/jump-if-not-equal  $get-num:main/disp8
<span id="L227" class="LineNr">227 </span>    <span class="subxS1Comment"># . expected(ed, err, &quot;integer&quot;)</span>
<span id="L228" class="LineNr">228 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L229" class="LineNr">229 </span>    68/push  <span class="Constant">&quot;integer&quot;</span>/imm32
<span id="L230" class="LineNr">230 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L231" class="LineNr">231 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x14/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+20)</span>
<span id="L232" class="LineNr">232 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L233" class="LineNr">233 </span>    e8/call  <a href='crenshaw2-1.subx.html#L471'>expected</a>/disp32  <span class="subxComment"># never returns</span>
<span id="L234" class="LineNr">234 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L235" class="LineNr">235 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L236" class="LineNr">236 </span><span class="Constant">$get-num:main</span>:
<span id="L237" class="LineNr">237 </span>    <span class="subxH1Comment"># - otherwise read a digit</span>
<span id="L238" class="LineNr">238 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L239" class="LineNr">239 </span>    50/push-eax
<span id="L240" class="LineNr">240 </span>    51/push-ecx
<span id="L241" class="LineNr">241 </span>    52/push-edx
<span id="L242" class="LineNr">242 </span>    53/push-ebx
<span id="L243" class="LineNr">243 </span>    56/push-esi
<span id="L244" class="LineNr">244 </span>    57/push-edi
<span id="L245" class="LineNr">245 </span>    <span class="subxComment"># read necessary variables to registers</span>
<span id="L246" class="LineNr">246 </span>    <span class="subxComment"># esi = in</span>
<span id="L247" class="LineNr">247 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L248" class="LineNr">248 </span>    <span class="subxComment"># edi = out</span>
<span id="L249" class="LineNr">249 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edi</span>
<span id="L250" class="LineNr">250 </span>    <span class="subxComment"># ecx = out-&gt;write</span>
<span id="L251" class="LineNr">251 </span>    8b/copy                         0/mod/indirect  7/rm32/edi   <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 *edi to ecx</span>
<span id="L252" class="LineNr">252 </span>    <span class="subxComment"># edx = out-&gt;length</span>
<span id="L253" class="LineNr">253 </span>    8b/copy                         1/mod/*+disp8   7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(edi+8) to edx</span>
<span id="L254" class="LineNr">254 </span>    <span class="subxComment"># if (out-&gt;write &gt;= out-&gt;length) error</span>
<span id="L255" class="LineNr">255 </span>    39/compare                      3/mod/direct    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"># compare edx with ecx</span>
<span id="L256" class="LineNr">256 </span>    7d/jump-if-lesser  $get-num:stage2/disp8
<span id="L257" class="LineNr">257 </span>    <span class="subxS1Comment"># . error(ed, err, msg)  # TODO: show full number</span>
<span id="L258" class="LineNr">258 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L259" class="LineNr">259 </span>    68/push  <span class="Constant">&quot;get-num: too many digits in number&quot;</span>/imm32
<span id="L260" class="LineNr">260 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L261" class="LineNr">261 </span>    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0x14/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+20)</span>
<span id="L262" class="LineNr">262 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L263" class="LineNr">263 </span>    e8/call  <a href='../063error.subx.html#L9'>error</a>/disp32  <span class="subxComment"># never returns</span>
<span id="L264" class="LineNr">264 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L265" class="LineNr">265 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L266" class="LineNr">266 </span><span class="Constant">$get-num:stage2</span>:
<span id="L267" class="LineNr">267 </span>    <span class="subxComment"># out-&gt;data[out-&gt;write] = LSB(Look)</span>
<span id="L268" class="LineNr">268 </span>    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  1/index/ecx  <span class="Normal"> . </span>          3/r32/ebx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy edi+ecx+12 to ebx</span>
<span id="L269" class="LineNr">269 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax   <span class="SpecialChar"><a href='crenshaw2-1.subx.html#L558'>Look</a></span>/disp32    <span class="Normal"> . </span>                <span class="subxComment"># copy *Look to eax</span>
<span id="L270" class="LineNr">270 </span>    88/copy-byte                    0/mod/indirect  3/rm32/ebx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/AL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at AL to *ebx</span>
<span id="L271" class="LineNr">271 </span>    <span class="subxComment"># ++out-&gt;write</span>
<span id="L272" class="LineNr">272 </span>    41/increment-ecx
<span id="L273" class="LineNr">273 </span>    <span class="subxComment"># Look = get-char(in)</span>
<span id="L274" class="LineNr">274 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L275" class="LineNr">275 </span>    56/push-esi
<span id="L276" class="LineNr">276 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L277" class="LineNr">277 </span>    e8/call  <a href='crenshaw2-1.subx.html#L513'>get-char</a>/disp32
<span id="L278" class="LineNr">278 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L279" class="LineNr">279 </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="L280" class="LineNr">280 </span><span class="Constant">$get-num:loop-end</span>:
<span id="L281" class="LineNr">281 </span>    <span class="subxComment"># persist necessary variables from registers</span>
<span id="L282" class="LineNr">282 </span>    89/copy                         0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ecx to *edi</span>
<span id="L283" class="LineNr">283 </span><span class="Constant">$get-num:end</span>:
<span id="L284" class="LineNr">284 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L285" class="LineNr">285 </span>    5f/pop-to-edi
<span id="L286" class="LineNr">286 </span>    5e/pop-to-esi
<span id="L287" class="LineNr">287 </span>    5b/pop-to-ebx
<span id="L288" class="LineNr">288 </span>    5a/pop-to-edx
<span id="L289" class="LineNr">289 </span>    59/pop-to-ecx
<span id="L290" class="LineNr">290 </span>    58/pop-to-eax
<span id="L291" class="LineNr">291 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L292" class="LineNr">292 </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="L293" class="LineNr">293 </span>    5d/pop-to-ebp
<span id="L294" class="LineNr">294 </span>    c3/return
<span id="L295" class="LineNr">295 </span>
<span id="L296" class="LineNr">296 </span><span class="subxTest">test-get-num-reads-single-digit</span>:
<span id="L297" class="LineNr">297 </span>    <span class="subxH1Comment"># - check that get-num returns first character if it's a digit</span>
<span id="L298" class="LineNr">298 </span>    <span class="subxComment"># This test uses exit-descriptors. Use ebp for setting up local variables.</span>
<span id="L299" class="LineNr">299 </span>    55/push-ebp
<span id="L300" class="LineNr">300 </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="L301" class="LineNr">301 </span>    <span class="subxComment"># clear all streams</span>
<span id="L302" class="LineNr">302 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L303" class="LineNr">303 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L304" class="LineNr">304 </span>    68/push  <a href='../057write.subx.html#L148'>_test-stream</a>/imm32
<span id="L305" class="LineNr">305 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L306" class="LineNr">306 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L307" class="LineNr">307 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L308" class="LineNr">308 </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="L309" class="LineNr">309 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file-&gt;buffer)</span>
<span id="L310" class="LineNr">310 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L311" class="LineNr">311 </span>    68/push  <a href='../061read-byte.subx.html#L278'>_test-buffered-file-&gt;buffer</a>/imm32
<span id="L312" class="LineNr">312 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L313" class="LineNr">313 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L314" class="LineNr">314 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L315" class="LineNr">315 </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="L316" class="LineNr">316 </span>    <span class="subxS1Comment"># . clear-stream(_test-output-stream)</span>
<span id="L317" class="LineNr">317 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L318" class="LineNr">318 </span>    68/push  <a href='../064write-byte.subx.html#L286'>_test-output-stream</a>/imm32
<span id="L319" class="LineNr">319 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L320" class="LineNr">320 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L321" class="LineNr">321 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L322" class="LineNr">322 </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="L323" class="LineNr">323 </span>    <span class="subxS1Comment"># . clear-stream(_test-error-stream)</span>
<span id="L324" class="LineNr">324 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L325" class="LineNr">325 </span>    68/push  <a href='../064write-byte.subx.html#L341'>_test-error-stream</a>/imm32
<span id="L326" class="LineNr">326 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L327" class="LineNr">327 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L330" class="LineNr">330 </span>    <span class="subxComment"># initialize 'in'</span>
<span id="L331" class="LineNr">331 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;3&quot;)</span>
<span id="L332" class="LineNr">332 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L333" class="LineNr">333 </span>    68/push  <span class="Constant">&quot;3&quot;</span>/imm32
<span id="L334" class="LineNr">334 </span>    68/push  <a href='../057write.subx.html#L148'>_test-stream</a>/imm32
<span id="L335" class="LineNr">335 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L336" class="LineNr">336 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L337" class="LineNr">337 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L338" class="LineNr">338 </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="L339" class="LineNr">339 </span>    <span class="subxComment"># initialize exit-descriptor 'ed' for the call to 'get-num' below</span>
<span id="L340" class="LineNr">340 </span>    <span class="subxS1Comment"># . var ed/eax : exit-descriptor</span>
<span id="L341" class="LineNr">341 </span>    81          5/subop/subtract    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"># subtract from esp</span>
<span id="L342" class="LineNr">342 </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="L343" class="LineNr">343 </span>    <span class="subxS1Comment"># . tailor-exit-descriptor(ed, 16)</span>
<span id="L344" class="LineNr">344 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L345" class="LineNr">345 </span>    68/push  0x10/imm32/nbytes-of-args-for-get-num
<span id="L346" class="LineNr">346 </span>    50/push-eax/ed
<span id="L347" class="LineNr">347 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L348" class="LineNr">348 </span>    e8/call  <a href='../059stop.subx.html#L44'>tailor-exit-descriptor</a>/disp32
<span id="L349" class="LineNr">349 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L350" class="LineNr">350 </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="L351" class="LineNr">351 </span>    <span class="subxComment"># prime the pump</span>
<span id="L352" class="LineNr">352 </span>    <span class="subxS1Comment"># . get-char(_test-buffered-file)</span>
<span id="L353" class="LineNr">353 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L354" class="LineNr">354 </span>    68/push  <a href='../061read-byte.subx.html#L275'>_test-buffered-file</a>/imm32
<span id="L355" class="LineNr">355 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L356" class="LineNr">356 </span>    e8/call  <a href='crenshaw2-1.subx.html#L513'>get-char</a>/disp32
<span id="L357" class="LineNr">357 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L358" class="LineNr">358 </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="L359" class="LineNr">359 </span>    <span class="subxComment"># get-num(in, out, err, ed)</span>
<span id="L360" class="LineNr">360 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L361" class="LineNr">361 </span>    50/push-eax/ed
<span id="L362" class="LineNr">362 </span>    68/push  <a href='../064write-byte.subx.html#L341'>_test-error-stream</a>/imm32
<span id="L363" class="LineNr">363 </span>    68/push  <a href='../064write-byte.subx.html#L286'>_test-output-stream</a>/imm32
<span id="L364" class="LineNr">364 </span>    68/push  <a href='../061read-byte.subx.html#L275'>_test-buffered-file</a>/imm32
<span id="L365" class="LineNr">365 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L366" class="LineNr">366 </span>    e8/call  <a href='crenshaw2-1.subx.html#L193'>get-num</a>/disp32
<span id="L367" class="LineNr">367 </span>    <span class="subxComment"># registers except esp may be clobbered at this point</span>
<span id="L368" class="LineNr">368 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L369" class="LineNr">369 </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>              0x10/imm32        <span class="subxComment"># add to esp</span>
<span id="L370" class="LineNr">370 </span>    <span class="subxComment"># check-ints-equal(*_test-output-stream-&gt;data, '3', msg)</span>
<span id="L371" class="LineNr">371 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L372" class="LineNr">372 </span>    68/push  <span class="Constant">&quot;F - test-get-num-reads-single-digit&quot;</span>/imm32
<span id="L373" class="LineNr">373 </span>    68/push  0x33/imm32
<span id="L374" class="LineNr">374 </span>    b8/copy-to-eax  <a href='../064write-byte.subx.html#L286'>_test-output-stream</a>/imm32
<span id="L375" class="LineNr">375 </span>    ff          6/subop/push        1/mod/*+disp8   0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(eax+12)</span>
<span id="L376" class="LineNr">376 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L377" class="LineNr">377 </span>    e8/call  <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L378" class="LineNr">378 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L379" class="LineNr">379 </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="L380" class="LineNr">380 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L381" class="LineNr">381 </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="L382" class="LineNr">382 </span>    5d/pop-to-ebp
<span id="L383" class="LineNr">383 </span>    c3/return
<span id="L384" class="LineNr">384 </span>
<span id="L385" class="LineNr">385 </span><span class="subxTest">test-get-num-aborts-on-non-digit-in-Look</span>:
<span id="L386" class="LineNr">386 </span>    <span class="subxH1Comment"># - check that get-num returns first character if it's a digit</span>
<span id="L387" class="LineNr">387 </span>    <span class="subxComment"># This test uses exit-descriptors. Use ebp for setting up local variables.</span>
<span id="L388" class="LineNr">388 </span>    55/push-ebp
<span id="L389" class="LineNr">389 </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="L390" class="LineNr">390 </span>    <span class="subxComment"># clear all streams</span>
<span id="L391" class="LineNr">391 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L392" class="LineNr">392 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L393" class="LineNr">393 </span>    68/push  <a href='../057write.subx.html#L148'>_test-stream</a>/imm32
<span id="L394" class="LineNr">394 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L395" class="LineNr">395 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L396" class="LineNr">396 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L397" class="LineNr">397 </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="L398" class="LineNr">398 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file-&gt;buffer)</span>
<span id="L399" class="LineNr">399 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L400" class="LineNr">400 </span>    68/push  <a href='../061read-byte.subx.html#L278'>_test-buffered-file-&gt;buffer</a>/imm32
<span id="L401" class="LineNr">401 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L402" class="LineNr">402 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L403" class="LineNr">403 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L404" class="LineNr">404 </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="L405" class="LineNr">405 </span>    <span class="subxS1Comment"># . clear-stream(_test-output-stream)</span>
<span id="L406" class="LineNr">406 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L407" class="LineNr">407 </span>    68/push  <a href='../064write-byte.subx.html#L286'>_test-output-stream</a>/imm32
<span id="L408" class="LineNr">408 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L409" class="LineNr">409 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L410" class="LineNr">410 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L411" class="LineNr">411 </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="L412" class="LineNr">412 </span>    <span class="subxS1Comment"># . clear-stream(_test-error-stream)</span>
<span id="L413" class="LineNr">413 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L414" class="LineNr">414 </span>    68/push  <a href='../064write-byte.subx.html#L341'>_test-error-stream</a>/imm32
<span id="L415" class="LineNr">415 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L416" class="LineNr">416 </span>    e8/call  <a href='../055stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L417" class="LineNr">417 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L418" class="LineNr">418 </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="L419" class="LineNr">419 </span>    <span class="subxComment"># initialize 'in'</span>
<span id="L420" class="LineNr">420 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;3&quot;)</span>
<span id="L421" class="LineNr">421 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L422" class="LineNr">422 </span>    68/push  <span class="Constant">&quot;3&quot;</span>/imm32
<span id="L423" class="LineNr">423 </span>    68/push  <a href='../057write.subx.html#L148'>_test-stream</a>/imm32
<span id="L424" class="LineNr">424 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L425" class="LineNr">425 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L426" class="LineNr">426 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L427" class="LineNr">427 </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="L428" class="LineNr">428 </span>    <span class="subxComment"># initialize exit-descriptor 'ed' for the call to 'get-num' below</span>
<span id="L429" class="LineNr">429 </span>    <span class="subxS1Comment"># . var ed/eax : (address exit-descriptor)</span>
<span id="L430" class="LineNr">430 </span>    81          5/subop/subtract    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"># subtract from esp</span>
<span id="L431" class="LineNr">431 </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="L432" class="LineNr">432 </span>    <span class="subxS1Comment"># . tailor-exit-descriptor(ed, 16)</span>
<span id="L433" class="LineNr">433 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L434" class="LineNr">434 </span>    68/push  0x10/imm32/nbytes-of-args-for-get-num
<span id="L435" class="LineNr">435 </span>    50/push-eax/ed
<span id="L436" class="LineNr">436 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L437" class="LineNr">437 </span>    e8/call  <a href='../059stop.subx.html#L44'>tailor-exit-descriptor</a>/disp32
<span id="L438" class="LineNr">438 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L439" class="LineNr">439 </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="L440" class="LineNr">440 </span>    <span class="subxComment"># *don't* prime the pump</span>
<span id="L441" class="LineNr">441 </span>    <span class="subxComment"># get-num(in, out, err, ed)</span>
<span id="L442" class="LineNr">442 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L443" class="LineNr">443 </span>    50/push-eax/ed
<span id="L444" class="LineNr">444 </span>    68/push  <a href='../064write-byte.subx.html#L341'>_test-error-stream</a>/imm32
<span id="L445" class="LineNr">445 </span>    68/push  <a href='../064write-byte.subx.html#L286'>_test-output-stream</a>/imm32
<span id="L446" class="LineNr">446 </span>    68/push  <a href='../061read-byte.subx.html#L275'>_test-buffered-file</a>/imm32
<span id="L447" class="LineNr">447 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L448" class="LineNr">448 </span>    e8/call  <a href='crenshaw2-1.subx.html#L193'>get-num</a>/disp32
<span id="L449" class="LineNr">449 </span>    <span class="subxComment"># registers except esp may be clobbered at this point</span>
<span id="L450" class="LineNr">450 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L451" class="LineNr">451 </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>              0x10/imm32        <span class="subxComment"># add to esp</span>
<span id="L452" class="LineNr">452 </span>    <span class="subxComment"># check that get-num tried to call exit(1)</span>
<span id="L453" class="LineNr">453 </span>    <span class="subxS1Comment"># . check-ints-equal(ed-&gt;value, 2, msg)  # i.e. stop was called with value 1</span>
<span id="L454" class="LineNr">454 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L455" class="LineNr">455 </span>    68/push  <span class="Constant">&quot;F - test-get-num-aborts-on-non-digit-in-Look&quot;</span>/imm32
<span id="L456" class="LineNr">456 </span>    68/push  2/imm32
<span id="L457" class="LineNr">457 </span>    <span class="subxS2Comment"># . . push ed-&gt;value</span>
<span id="L458" class="LineNr">458 </span>    ff          6/subop/push        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"># push *(eax+4)</span>
<span id="L459" class="LineNr">459 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L460" class="LineNr">460 </span>    e8/call  <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L461" class="LineNr">461 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L462" class="LineNr">462 </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="L463" class="LineNr">463 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L464" class="LineNr">464 </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="L465" class="LineNr">465 </span>    5d/pop-to-ebp
<span id="L466" class="LineNr">466 </span>    c3/return
<span id="L467" class="LineNr">467 </span>
<span id="L468" class="LineNr">468 </span><span class="subxComment">## helpers</span>
<span id="L469" class="LineNr">469 </span>
<span id="L470" class="LineNr">470 </span><span class="subxComment"># write(f, &quot;Error: &quot;+s+&quot; expected\n&quot;) then stop(ed, 1)</span>
<span id="L471" class="LineNr">471 </span><span class="subxFunction">expected</span>:  <span class="subxComment"># ed : (address exit-descriptor), f : fd or (address stream), s : (address array byte)</span>
<span id="L472" class="LineNr">472 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L473" class="LineNr">473 </span>    55/push-ebp
<span id="L474" class="LineNr">474 </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="L475" class="LineNr">475 </span>    <span class="subxComment"># write(f, &quot;Error: &quot;)</span>
<span id="L476" class="LineNr">476 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L477" class="LineNr">477 </span>    68/push  <span class="Constant">&quot;Error: &quot;</span>/imm32
<span id="L478" class="LineNr">478 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L479" class="LineNr">479 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L480" class="LineNr">480 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L481" class="LineNr">481 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L482" class="LineNr">482 </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="L483" class="LineNr">483 </span>    <span class="subxComment"># write(f, s)</span>
<span id="L484" class="LineNr">484 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L485" class="LineNr">485 </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>          0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+16)</span>
<span id="L486" class="LineNr">486 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L487" class="LineNr">487 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L488" class="LineNr">488 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L489" class="LineNr">489 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L490" class="LineNr">490 </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="L491" class="LineNr">491 </span>    <span class="subxComment"># write(f, &quot; expected&quot;)</span>
<span id="L492" class="LineNr">492 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L493" class="LineNr">493 </span>    68/push  <span class="Constant">&quot; expected\n&quot;</span>/imm32
<span id="L494" class="LineNr">494 </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>          0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># push *(ebp+12)</span>
<span id="L495" class="LineNr">495 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L496" class="LineNr">496 </span>    e8/call  <a href='../057write.subx.html#L24'>write</a>/disp32
<span id="L497" class="LineNr">497 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L498" class="LineNr">498 </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="L499" class="LineNr">499 </span>    <span class="subxComment"># stop(ed, 1)</span>
<span id="L500" class="LineNr">500 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L501" class="LineNr">501 </span>    68/push  1/imm32
<span id="L502" class="LineNr">502 </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="L503" class="LineNr">503 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L504" class="LineNr">504 </span>    e8/call  <a href='../059stop.subx.html#L92'>stop</a>/disp32
<span id="L505" class="LineNr">505 </span>    <span class="subxComment"># should never get past this point</span>
<span id="L506" class="LineNr">506 </span><span class="Constant">$expected:dead-end</span>:
<span id="L507" class="LineNr">507 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L508" class="LineNr">508 </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="L509" class="LineNr">509 </span>    5d/pop-to-ebp
<span id="L510" class="LineNr">510 </span>    c3/return
<span id="L511" class="LineNr">511 </span>
<span id="L512" class="LineNr">512 </span><span class="subxComment"># read a byte from 'f', and save it in 'Look'</span>
<span id="L513" class="LineNr">513 </span><span class="subxFunction">get-char</span>:  <span class="subxComment"># f : (address buffered-file)</span>
<span id="L514" class="LineNr">514 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L515" class="LineNr">515 </span>    55/push-ebp
<span id="L516" class="LineNr">516 </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="L517" class="LineNr">517 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L518" class="LineNr">518 </span>    50/push-eax
<span id="L519" class="LineNr">519 </span>    <span class="subxComment"># eax = read-byte-buffered(f)</span>
<span id="L520" class="LineNr">520 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L521" class="LineNr">521 </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="L522" class="LineNr">522 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L523" class="LineNr">523 </span>    e8/call  <a href='../061read-byte.subx.html#L38'>read-byte-buffered</a>/disp32
<span id="L524" class="LineNr">524 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L525" class="LineNr">525 </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="L526" class="LineNr">526 </span>    <span class="subxComment"># save eax to Look</span>
<span id="L527" class="LineNr">527 </span>    89/copy                         0/mod/indirect  5/rm32/.disp32           <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax   <span class="SpecialChar"><a href='crenshaw2-1.subx.html#L558'>Look</a></span>/disp32    <span class="Normal"> . </span>                <span class="subxComment"># copy eax to *Look</span>
<span id="L528" class="LineNr">528 </span><span class="Constant">$get-char:end</span>:
<span id="L529" class="LineNr">529 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L530" class="LineNr">530 </span>    58/pop-to-eax
<span id="L531" class="LineNr">531 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L532" class="LineNr">532 </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="L533" class="LineNr">533 </span>    5d/pop-to-ebp
<span id="L534" class="LineNr">534 </span>    c3/return
<span id="L535" class="LineNr">535 </span>
<span id="L536" class="LineNr">536 </span><span class="subxFunction">is-digit?</span>:  <span class="subxComment"># c : int -&gt; eax : boolean</span>
<span id="L537" class="LineNr">537 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L538" class="LineNr">538 </span>    55/push-ebp
<span id="L539" class="LineNr">539 </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="L540" class="LineNr">540 </span>    <span class="subxComment"># eax = false</span>
<span id="L541" class="LineNr">541 </span>    b8/copy-to-eax  0/imm32
<span id="L542" class="LineNr">542 </span>    <span class="subxComment"># if (c &lt; '0') return false</span>
<span id="L543" class="LineNr">543 </span>    81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8         0x30/imm32        <span class="subxComment"># compare *(ebp+8)</span>
<span id="L544" class="LineNr">544 </span>    7c/jump-if-lesser  $is-digit?:end/disp8
<span id="L545" class="LineNr">545 </span>    <span class="subxComment"># if (c &gt; '9') return false</span>
<span id="L546" class="LineNr">546 </span>    81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          8/disp8         0x39/imm32        <span class="subxComment"># compare *(ebp+8)</span>
<span id="L547" class="LineNr">547 </span>    7f/jump-if-greater  $is-digit?:end/disp8
<span id="L548" class="LineNr">548 </span>    <span class="subxComment"># otherwise return true</span>
<span id="L549" class="LineNr">549 </span>    b8/copy-to-eax  1/imm32
<span id="L550" class="LineNr">550 </span><span class="Constant">$is-digit?:end</span>:
<span id="L551" class="LineNr">551 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L552" class="LineNr">552 </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="L553" class="LineNr">553 </span>    5d/pop-to-ebp
<span id="L554" class="LineNr">554 </span>    c3/return
<span id="L555" class="LineNr">555 </span>
<span id="L556" class="LineNr">556 </span>== data
<span id="L557" class="LineNr">557 </span>
<span id="L558" class="LineNr">558 </span><span class="SpecialChar">Look</span>:  <span class="subxComment"># (char with some extra padding)</span>
<span id="L559" class="LineNr">559 </span>    0/imm32
<span id="L560" class="LineNr">560 </span>
<span id="L561" class="LineNr">561 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->