|
|
<!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 - subx/apps/crenshaw2-1.subx</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<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">
<style type="text/css">
<!--
pre { font-family: monospace; color: #aaaaaa; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; }
a { color:#eeeeee; text-decoration: none; }
a:hover { text-decoration: underline; }
* { font-size: 12pt; font-size: 1em; }
.CommentedCode { color: #6c6c6c; }
.LineNr { color: #444444; }
.Constant { color: #00a0a0; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.Comment { color: #9090ff; }
.Comment a { color:#0000ee; text-decoration:underline; }
.SalientComment { color: #00ffff; }
-->
</style>
<script type='text/javascript'>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## 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="Comment"># Corresponds to the section "single digits" 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="Comment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># To run (from the subx directory):</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment"># $ ./subx translate *.subx apps/crenshaw2-1.subx -o crenshaw2-1</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># $ echo '3' |./subx run apps/crenshaw2-1</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># Expected output (not working yet):</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># # syscall(exit, 3)</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment"># bb/copy-to-EBX 3/imm32</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment"># b8/copy-to-EAX 1/imm32/exit</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment"># cd/syscall 0x80/imm8</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">#</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment"># To run the generated output:</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment"># $ echo '3' |./subx run apps/crenshaw2-1 > z1.subx</span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment"># $ ./subx translate z1.subx -o z1</span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment"># $ ./subx run z1</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment"># $ echo $?</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment"># 3</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">#</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment"># Stdin must contain just a single hex digit. Other input will print an error:</span>
<span id="L21" class="LineNr"> 21 </span><span class="Comment"># $ echo 'xyz' |./subx run apps/crenshaw2-1</span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment"># Error: integer expected</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">#</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment"># Names in this file sometimes follow Crenshaw's original rather than my usual</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment"># naming conventions.</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span>== code
<span id="L28" class="LineNr"> 28 </span><span class="Comment"># instruction effective address operand displacement immediate</span>
<span id="L29" class="LineNr"> 29 </span><span class="Comment"># op subop mod rm32 base index scale r32</span>
<span id="L30" class="LineNr"> 30 </span><span class="Comment"># 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="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="Comment"># main: run tests if necessary, call 'compile' if not</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Comment"># prolog</span>
<span id="L34" class="LineNr"> 34 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Comment"># if (argc > 1)</span>
<span id="L36" class="LineNr"> 36 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/disp8 1/imm32 <span class="Comment"># compare *EBP</span>
<span id="L37" class="LineNr"> 37 </span> 7e/jump-if-lesser-or-equal $run-main/disp8
<span id="L38" class="LineNr"> 38 </span> <span class="Comment"># and if (argv[1] == "test")</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Comment"># push args</span>
<span id="L40" class="LineNr"> 40 </span> 68/push <span class="Constant">"test"</span>/imm32
<span id="L41" class="LineNr"> 41 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Comment"># call</span>
<span id="L43" class="LineNr"> 43 </span> e8/call kernel-string-equal/disp32
<span id="L44" class="LineNr"> 44 </span> <span class="Comment"># discard args</span>
<span id="L45" class="LineNr"> 45 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Comment"># check result</span>
<span id="L47" class="LineNr"> 47 </span> 3d/compare-EAX 1/imm32
<span id="L48" class="LineNr"> 48 </span> 75/jump-if-not-equal $run-main/disp8
<span id="L49" class="LineNr"> 49 </span> <span class="Comment"># then return run-tests()</span>
<span id="L50" class="LineNr"> 50 </span> e8/call run-tests/disp32
<span id="L51" class="LineNr"> 51 </span><span class="CommentedCode">#? e8/call test-get-num-reads-multiple-digits/disp32</span>
<span id="L52" class="LineNr"> 52 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/r32/EBX <span class="Special">Num-test-failures</span>/disp32 <span class="Comment"># copy *Num-test-failures to EBX</span>
<span id="L53" class="LineNr"> 53 </span> eb/jump $main:end/disp8
<span id="L54" class="LineNr"> 54 </span>$run-main:
<span id="L55" class="LineNr"> 55 </span> <span class="Comment"># allocate space for an exit-descriptor</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Comment"># var ed/EAX : (address exit-descriptor)</span>
<span id="L57" class="LineNr"> 57 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># subtract from ESP</span>
<span id="L58" class="LineNr"> 58 </span> 8d/copy-address 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EAX</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Comment"># clear ed->target (so we really exit)</span>
<span id="L60" class="LineNr"> 60 </span> c7/copy 0/mod/direct 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/imm32 <span class="Comment"># copy to *EAX</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Comment"># compile(Stdin, 1/stdout, 2/stderr, ed)</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Comment"># push args</span>
<span id="L63" class="LineNr"> 63 </span> 50/push-EAX/ed
<span id="L64" class="LineNr"> 64 </span> 68/push 2/imm32/stderr
<span id="L65" class="LineNr"> 65 </span> 68/push 1/imm32/stdout
<span id="L66" class="LineNr"> 66 </span> 68/push <span class="Special">Stdin</span>/imm32
<span id="L67" class="LineNr"> 67 </span> <span class="Comment"># call</span>
<span id="L68" class="LineNr"> 68 </span> e8/call compile/disp32
<span id="L69" class="LineNr"> 69 </span> <span class="Comment"># discard args</span>
<span id="L70" class="LineNr"> 70 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/imm32 <span class="Comment"># add to ESP</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Comment"># syscall(exit, 0)</span>
<span id="L72" class="LineNr"> 72 </span> bb/copy-to-EBX 0/imm32
<span id="L73" class="LineNr"> 73 </span>$main:end:
<span id="L74" class="LineNr"> 74 </span> b8/copy-to-EAX 1/imm32/exit
<span id="L75" class="LineNr"> 75 </span> cd/syscall 0x80/imm8
<span id="L76" class="LineNr"> 76 </span>
<span id="L77" class="LineNr"> 77 </span><span class="Comment"># the main entry point</span>
<span id="L78" class="LineNr"> 78 </span>compile: <span class="Comment"># in : fd or (address stream), out : fd or (address stream), err : fd or (address stream), ed : (address exit-descriptor) -> <void></span>
<span id="L79" class="LineNr"> 79 </span> <span class="Comment"># prolog</span>
<span id="L80" class="LineNr"> 80 </span> 55/push-EBP
<span id="L81" class="LineNr"> 81 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Comment"># save registers</span>
<span id="L83" class="LineNr"> 83 </span> 50/push-EAX
<span id="L84" class="LineNr"> 84 </span> 51/push-ECX
<span id="L85" class="LineNr"> 85 </span> <span class="Comment"># Look = get-char(in)</span>
<span id="L86" class="LineNr"> 86 </span> <span class="Comment"># push args</span>
<span id="L87" class="LineNr"> 87 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Comment"># call</span>
<span id="L89" class="LineNr"> 89 </span> e8/call get-char/disp32
<span id="L90" class="LineNr"> 90 </span> <span class="Comment"># discard args</span>
<span id="L91" class="LineNr"> 91 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Comment"># var num/ECX : (address stream) on the stack</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Comment"># 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="L94" class="LineNr"> 94 </span> <span class="Comment"># We won't add more, so that we can get overflow-handling for free.</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Comment"># Add 12 bytes for 'read', 'write' and 'length' fields, for a total of 19 bytes, or 0x13 in hex.</span>
<span id="L96" class="LineNr"> 96 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x13/imm32 <span class="Comment"># subtract from ESP</span>
<span id="L97" class="LineNr"> 97 </span> 8d/copy-address 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 1/r32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to ECX</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Comment"># num->length = 7</span>
<span id="L99" class="LineNr"> 99 </span> c7/copy 1/mod/*+disp8 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 7/imm32 <span class="Comment"># copy to *(ECX+8)</span>
<span id="L100" class="LineNr">100 </span> <span class="Comment"># clear-stream(num)</span>
<span id="L101" class="LineNr">101 </span> <span class="Comment"># push args</span>
<span id="L102" class="LineNr">102 </span> 51/push-ECX
<span id="L103" class="LineNr">103 </span> <span class="Comment"># call</span>
<span id="L104" class="LineNr">104 </span> e8/call clear-stream/disp32
<span id="L105" class="LineNr">105 </span> <span class="Comment"># discard args</span>
<span id="L106" class="LineNr">106 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L107" class="LineNr">107 </span> <span class="Comment"># get-num(in, num, err, ed)</span>
<span id="L108" class="LineNr">108 </span> <span class="Comment"># push args</span>
<span id="L109" class="LineNr">109 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x14/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+20)</span>
<span id="L110" class="LineNr">110 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+16)</span>
<span id="L111" class="LineNr">111 </span> 51/push-ECX/num
<span id="L112" class="LineNr">112 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L113" class="LineNr">113 </span> <span class="Comment"># call</span>
<span id="L114" class="LineNr">114 </span> e8/call get-num/disp32
<span id="L115" class="LineNr">115 </span> <span class="Comment"># discard args</span>
<span id="L116" class="LineNr">116 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/imm32 <span class="Comment"># add to ESP</span>
<span id="L117" class="LineNr">117 </span> <span class="Comment"># EAX = write(_test-stream, "Ab")</span>
<span id="L118" class="LineNr">118 </span> <span class="Comment"># push args</span>
<span id="L119" class="LineNr">119 </span> 68/push <span class="Constant">"Ab"</span>/imm32
<span id="L120" class="LineNr">120 </span> 68/push _test-stream/imm32
<span id="L121" class="LineNr">121 </span> <span class="Comment"># call</span>
<span id="L122" class="LineNr">122 </span> e8/call write/disp32
<span id="L123" class="LineNr">123 </span> <span class="Comment"># discard args</span>
<span id="L124" class="LineNr">124 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L125" class="LineNr">125 </span> <span class="Comment"># EAX = write(out, "bb/copy-to-EBX ")</span>
<span id="L126" class="LineNr">126 </span> <span class="Comment"># push args</span>
<span id="L127" class="LineNr">127 </span> 68/push <span class="Constant">"bb/copy-to-EBX "</span>/imm32
<span id="L128" class="LineNr">128 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L129" class="LineNr">129 </span> <span class="Comment"># call</span>
<span id="L130" class="LineNr">130 </span> e8/call write/disp32
<span id="L131" class="LineNr">131 </span> <span class="Comment"># discard args</span>
<span id="L132" class="LineNr">132 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L133" class="LineNr">133 </span> <span class="Comment"># write-stream(out, num)</span>
<span id="L134" class="LineNr">134 </span> <span class="Comment"># push args</span>
<span id="L135" class="LineNr">135 </span> 51/push-ECX/num
<span id="L136" class="LineNr">136 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L137" class="LineNr">137 </span> <span class="Comment"># call</span>
<span id="L138" class="LineNr">138 </span> e8/call write-stream/disp32
<span id="L139" class="LineNr">139 </span> <span class="Comment"># discard args</span>
<span id="L140" class="LineNr">140 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L141" class="LineNr">141 </span> <span class="Comment"># write(out, Newline)</span>
<span id="L142" class="LineNr">142 </span> <span class="Comment"># push args</span>
<span id="L143" class="LineNr">143 </span> 68/push <span class="Special">Newline</span>/imm32
<span id="L144" class="LineNr">144 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L145" class="LineNr">145 </span> <span class="Comment"># call</span>
<span id="L146" class="LineNr">146 </span> e8/call write/disp32
<span id="L147" class="LineNr">147 </span> <span class="Comment"># discard args</span>
<span id="L148" class="LineNr">148 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L149" class="LineNr">149 </span> <span class="Comment"># EAX = write(out, "b8/copy-to-EAX 1/imm32/exit")</span>
<span id="L150" class="LineNr">150 </span> <span class="Comment"># push args</span>
<span id="L151" class="LineNr">151 </span> 68/push <span class="Constant">"b8/copy-to-EAX 1/imm32/exit"</span>/imm32
<span id="L152" class="LineNr">152 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L153" class="LineNr">153 </span> <span class="Comment"># call</span>
<span id="L154" class="LineNr">154 </span> e8/call write/disp32
<span id="L155" class="LineNr">155 </span> <span class="Comment"># discard args</span>
<span id="L156" class="LineNr">156 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L157" class="LineNr">157 </span> <span class="Comment"># EAX = write(out, Newline)</span>
<span id="L158" class="LineNr">158 </span> <span class="Comment"># push args</span>
<span id="L159" class="LineNr">159 </span> 68/push <span class="Special">Newline</span>/imm32
<span id="L160" class="LineNr">160 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L161" class="LineNr">161 </span> <span class="Comment"># call</span>
<span id="L162" class="LineNr">162 </span> e8/call write/disp32
<span id="L163" class="LineNr">163 </span> <span class="Comment"># discard args</span>
<span id="L164" class="LineNr">164 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L165" class="LineNr">165 </span> <span class="Comment"># EAX = write(out, "cd/syscall 0x80/imm8")</span>
<span id="L166" class="LineNr">166 </span> <span class="Comment"># push args</span>
<span id="L167" class="LineNr">167 </span> 68/push <span class="Constant">"cd/syscall 0x80/imm8"</span>/imm32
<span id="L168" class="LineNr">168 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L169" class="LineNr">169 </span> <span class="Comment"># call</span>
<span id="L170" class="LineNr">170 </span> e8/call write/disp32
<span id="L171" class="LineNr">171 </span> <span class="Comment"># discard args</span>
<span id="L172" class="LineNr">172 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L173" class="LineNr">173 </span> <span class="Comment"># EAX = write(out, Newline)</span>
<span id="L174" class="LineNr">174 </span> <span class="Comment"># push args</span>
<span id="L175" class="LineNr">175 </span> 68/push <span class="Special">Newline</span>/imm32
<span id="L176" class="LineNr">176 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L177" class="LineNr">177 </span> <span class="Comment"># call</span>
<span id="L178" class="LineNr">178 </span> e8/call write/disp32
<span id="L179" class="LineNr">179 </span> <span class="Comment"># discard args</span>
<span id="L180" class="LineNr">180 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L181" class="LineNr">181 </span> <span class="Comment"># restore registers</span>
<span id="L182" class="LineNr">182 </span> 59/pop-to-ECX
<span id="L183" class="LineNr">183 </span> 58/pop-to-EAX
<span id="L184" class="LineNr">184 </span> <span class="Comment"># epilog</span>
<span id="L185" class="LineNr">185 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L186" class="LineNr">186 </span> 5d/pop-to-EBP
<span id="L187" class="LineNr">187 </span> c3/return
<span id="L188" class="LineNr">188 </span>
<span id="L189" class="LineNr">189 </span><span class="Comment"># Read a single digit into 'out'. Abort if there are none, or if there is no space in 'out'.</span>
<span id="L190" class="LineNr">190 </span><span class="Comment"># Input comes from the global variable 'Look', and we leave the next byte from</span>
<span id="L191" class="LineNr">191 </span><span class="Comment"># 'in' into it on exit.</span>
<span id="L192" class="LineNr">192 </span>get-num: <span class="Comment"># in : (address buffered-file), out : (address stream), err : fd or (address stream), ed : (address exit-descriptor) -> <void></span>
<span id="L193" class="LineNr">193 </span> <span class="Comment"># pseudocode:</span>
<span id="L194" class="LineNr">194 </span> <span class="Comment"># if !is-digit?(Look) expected(ed, err, "integer")</span>
<span id="L195" class="LineNr">195 </span> <span class="Comment"># if out.write >= out.length</span>
<span id="L196" class="LineNr">196 </span> <span class="Comment"># write(err, "Error: too many digits in number\n")</span>
<span id="L197" class="LineNr">197 </span> <span class="Comment"># stop(ed, 1)</span>
<span id="L198" class="LineNr">198 </span> <span class="Comment"># out.data[out.write] = LSB(Look)</span>
<span id="L199" class="LineNr">199 </span> <span class="Comment"># ++out.write</span>
<span id="L200" class="LineNr">200 </span> <span class="Comment"># Look = get-char(in)</span>
<span id="L201" class="LineNr">201 </span> <span class="Comment">#</span>
<span id="L202" class="LineNr">202 </span> <span class="Comment"># within the loop we'll try to keep things in registers:</span>
<span id="L203" class="LineNr">203 </span> <span class="Comment"># ESI : in</span>
<span id="L204" class="LineNr">204 </span> <span class="Comment"># EDI : out</span>
<span id="L205" class="LineNr">205 </span> <span class="Comment"># EAX : temp</span>
<span id="L206" class="LineNr">206 </span> <span class="Comment"># ECX : out->write</span>
<span id="L207" class="LineNr">207 </span> <span class="Comment"># EDX : out->length</span>
<span id="L208" class="LineNr">208 </span> <span class="Comment"># EBX : temp2</span>
<span id="L209" class="LineNr">209 </span> <span class="Comment"># We can't allocate Look to a register because it gets written implicitly in</span>
<span id="L210" class="LineNr">210 </span> <span class="Comment"># get-char in each iteration of the loop. (Thereby demonstrating that it's</span>
<span id="L211" class="LineNr">211 </span> <span class="Comment"># 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="Comment">#</span>
<span id="L213" class="LineNr">213 </span> <span class="Comment"># prolog</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="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L216" class="LineNr">216 </span> <span class="Comment"># EAX = is-digit?(Look)</span>
<span id="L217" class="LineNr">217 </span> <span class="Comment"># push args</span>
<span id="L218" class="LineNr">218 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Special">Look</span>/disp32 <span class="Delimiter"> . </span> <span class="Comment"># push *Look</span>
<span id="L219" class="LineNr">219 </span> <span class="Comment"># call</span>
<span id="L220" class="LineNr">220 </span> e8/call is-digit?/disp32
<span id="L221" class="LineNr">221 </span> <span class="Comment"># discard args</span>
<span id="L222" class="LineNr">222 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L223" class="LineNr">223 </span> <span class="Comment"># if EAX == 0 error</span>
<span id="L224" class="LineNr">224 </span> 3d/compare-EAX 0/imm32
<span id="L225" class="LineNr">225 </span> 75/jump-if-not-equal $get-num:main/disp8
<span id="L226" class="LineNr">226 </span> <span class="Comment"># expected(ed, err, "integer")</span>
<span id="L227" class="LineNr">227 </span> <span class="Comment"># push args</span>
<span id="L228" class="LineNr">228 </span> 68/push <span class="Constant">"integer"</span>/imm32
<span id="L229" class="LineNr">229 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+16)</span>
<span id="L230" class="LineNr">230 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x14/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+20)</span>
<span id="L231" class="LineNr">231 </span> <span class="Comment"># call</span>
<span id="L232" class="LineNr">232 </span> e8/call expected/disp32 <span class="Comment"># never returns</span>
<span id="L233" class="LineNr">233 </span> <span class="Comment"># discard args</span>
<span id="L234" class="LineNr">234 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L235" class="LineNr">235 </span>$get-num:main:
<span id="L236" class="LineNr">236 </span> <span class="Comment"># save registers</span>
<span id="L237" class="LineNr">237 </span> 50/push-EAX
<span id="L238" class="LineNr">238 </span> 51/push-ECX
<span id="L239" class="LineNr">239 </span> 52/push-EDX
<span id="L240" class="LineNr">240 </span> 53/push-EBX
<span id="L241" class="LineNr">241 </span> 56/push-ESI
<span id="L242" class="LineNr">242 </span> 57/push-EDI
<span id="L243" class="LineNr">243 </span> <span class="Comment"># read necessary variables to registers</span>
<span id="L244" class="LineNr">244 </span> <span class="Comment"># ESI = in</span>
<span id="L245" class="LineNr">245 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 6/r32/ESI 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to ESI</span>
<span id="L246" class="LineNr">246 </span> <span class="Comment"># EDI = out</span>
<span id="L247" class="LineNr">247 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 7/r32/EDI 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+12) to EDI</span>
<span id="L248" class="LineNr">248 </span> <span class="Comment"># ECX = out->write</span>
<span id="L249" class="LineNr">249 </span> 8b/copy 0/mod/indirect 7/rm32/EDI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/r32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *EDI to ECX</span>
<span id="L250" class="LineNr">250 </span> <span class="Comment"># EDX = out->length</span>
<span id="L251" class="LineNr">251 </span> 8b/copy 1/mod/*+disp8 7/rm32/EDI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EDI+8) to EDX</span>
<span id="L252" class="LineNr">252 </span> <span class="Comment"># if out->write >= out->length error</span>
<span id="L253" class="LineNr">253 </span> 3b/compare 3/mod/direct 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># compare EDX with ECX</span>
<span id="L254" class="LineNr">254 </span> 7d/jump-if-lesser $get-num:stage2/disp8
<span id="L255" class="LineNr">255 </span> <span class="Comment"># error(ed, err, "get-num: too many digits in number") # TODO: show full number</span>
<span id="L256" class="LineNr">256 </span> <span class="Comment"># push args</span>
<span id="L257" class="LineNr">257 </span> 68/push <span class="Constant">"get-num: too many digits in number"</span>/imm32
<span id="L258" class="LineNr">258 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+16)</span>
<span id="L259" class="LineNr">259 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x14/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+20)</span>
<span id="L260" class="LineNr">260 </span> <span class="Comment"># call</span>
<span id="L261" class="LineNr">261 </span> e8/call error/disp32 <span class="Comment"># never returns</span>
<span id="L262" class="LineNr">262 </span> <span class="Comment"># discard args</span>
<span id="L263" class="LineNr">263 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L264" class="LineNr">264 </span>$get-num:stage2:
<span id="L265" class="LineNr">265 </span> <span class="Comment"># out->data[out->write] = LSB(Look)</span>
<span id="L266" class="LineNr">266 </span> 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 1/index/ECX <span class="Delimiter"> . </span> 3/r32/EBX 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy EDI+ECX+12 to EBX</span>
<span id="L267" class="LineNr">267 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX <span class="Special">Look</span>/disp32 <span class="Delimiter"> . </span> <span class="Comment"># copy *Look to EAX</span>
<span id="L268" class="LineNr">268 </span> 88/copy-byte 0/mod/indirect 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/AL <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy byte at AL to *EBX</span>
<span id="L269" class="LineNr">269 </span> <span class="Comment"># ++out->write</span>
<span id="L270" class="LineNr">270 </span> 41/increment-ECX
<span id="L271" class="LineNr">271 </span> <span class="Comment"># Look = get-char(in)</span>
<span id="L272" class="LineNr">272 </span> <span class="Comment"># push args</span>
<span id="L273" class="LineNr">273 </span> 56/push-ESI
<span id="L274" class="LineNr">274 </span> <span class="Comment"># call</span>
<span id="L275" class="LineNr">275 </span> e8/call get-char/disp32
<span id="L276" class="LineNr">276 </span> <span class="Comment"># discard args</span>
<span id="L277" class="LineNr">277 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L278" class="LineNr">278 </span>$get-num:loop-end:
<span id="L279" class="LineNr">279 </span> <span class="Comment"># persist necessary variables from registers</span>
<span id="L280" class="LineNr">280 </span> 89/copy 0/mod/indirect 7/rm32/EDI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/r32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ECX to *EDI</span>
<span id="L281" class="LineNr">281 </span> <span class="Comment"># restore registers</span>
<span id="L282" class="LineNr">282 </span> 5f/pop-to-EDI
<span id="L283" class="LineNr">283 </span> 5e/pop-to-ESI
<span id="L284" class="LineNr">284 </span> 5b/pop-to-EBX
<span id="L285" class="LineNr">285 </span> 5a/pop-to-EDX
<span id="L286" class="LineNr">286 </span> 59/pop-to-ECX
<span id="L287" class="LineNr">287 </span> 58/pop-to-EAX
<span id="L288" class="LineNr">288 </span> <span class="Comment"># epilog</span>
<span id="L289" class="LineNr">289 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L290" class="LineNr">290 </span> 5d/pop-to-EBP
<span id="L291" class="LineNr">291 </span> c3/return
<span id="L292" class="LineNr">292 </span>
<span id="L293" class="LineNr">293 </span>test-get-num-reads-single-digit:
<span id="L294" class="LineNr">294 </span> <span class="SalientComment">## check that get-num returns first character if it's a digit</span>
<span id="L295" class="LineNr">295 </span> <span class="Comment"># This test uses exit-descriptors. Use EBP for setting up local variables.</span>
<span id="L296" class="LineNr">296 </span> 55/push-EBP
<span id="L297" class="LineNr">297 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L298" class="LineNr">298 </span> <span class="SalientComment">## clear all streams</span>
<span id="L299" class="LineNr">299 </span> <span class="Comment"># clear-stream(_test-stream)</span>
<span id="L300" class="LineNr">300 </span> <span class="Comment"># push args</span>
<span id="L301" class="LineNr">301 </span> 68/push _test-stream/imm32
<span id="L302" class="LineNr">302 </span> <span class="Comment"># call</span>
<span id="L303" class="LineNr">303 </span> e8/call clear-stream/disp32
<span id="L304" class="LineNr">304 </span> <span class="Comment"># discard args</span>
<span id="L305" class="LineNr">305 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L306" class="LineNr">306 </span> <span class="Comment"># clear-stream(_test-buffered-file+4)</span>
<span id="L307" class="LineNr">307 </span> <span class="Comment"># push args</span>
<span id="L308" class="LineNr">308 </span> b8/copy-to-EAX _test-buffered-file/imm32
<span id="L309" class="LineNr">309 </span> 05/add-to-EAX 4/imm32
<span id="L310" class="LineNr">310 </span> 50/push-EAX
<span id="L311" class="LineNr">311 </span> <span class="Comment"># call</span>
<span id="L312" class="LineNr">312 </span> e8/call clear-stream/disp32
<span id="L313" class="LineNr">313 </span> <span class="Comment"># discard args</span>
<span id="L314" class="LineNr">314 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L315" class="LineNr">315 </span> <span class="Comment"># clear-stream(_test-output-stream)</span>
<span id="L316" class="LineNr">316 </span> <span class="Comment"># push args</span>
<span id="L317" class="LineNr">317 </span> 68/push _test-output-stream/imm32
<span id="L318" class="LineNr">318 </span> <span class="Comment"># call</span>
<span id="L319" class="LineNr">319 </span> e8/call clear-stream/disp32
<span id="L320" class="LineNr">320 </span> <span class="Comment"># discard args</span>
<span id="L321" class="LineNr">321 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L322" class="LineNr">322 </span> <span class="Comment"># clear-stream(_test-error-stream)</span>
<span id="L323" class="LineNr">323 </span> <span class="Comment"># push args</span>
<span id="L324" class="LineNr">324 </span> 68/push _test-error-stream/imm32
<span id="L325" class="LineNr">325 </span> <span class="Comment"># call</span>
<span id="L326" class="LineNr">326 </span> e8/call clear-stream/disp32
<span id="L327" class="LineNr">327 </span> <span class="Comment"># discard args</span>
<span id="L328" class="LineNr">328 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L329" class="LineNr">329 </span> <span class="SalientComment">## initialize 'in'</span>
<span id="L330" class="LineNr">330 </span> <span class="Comment"># write(_test-stream, "3")</span>
<span id="L331" class="LineNr">331 </span> <span class="Comment"># push args</span>
<span id="L332" class="LineNr">332 </span> 68/push <span class="Constant">"3"</span>/imm32
<span id="L333" class="LineNr">333 </span> 68/push _test-stream/imm32
<span id="L334" class="LineNr">334 </span> <span class="Comment"># call</span>
<span id="L335" class="LineNr">335 </span> e8/call write/disp32
<span id="L336" class="LineNr">336 </span> <span class="Comment"># discard args</span>
<span id="L337" class="LineNr">337 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L338" class="LineNr">338 </span> <span class="SalientComment">## initialize exit-descriptor 'ed'</span>
<span id="L339" class="LineNr">339 </span> <span class="Comment"># allocate on stack</span>
<span id="L340" class="LineNr">340 </span> <span class="Comment"># var ed/EAX : (address exit-descriptor)</span>
<span id="L341" class="LineNr">341 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># subtract from ESP</span>
<span id="L342" class="LineNr">342 </span> 8d/copy-address 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EAX</span>
<span id="L343" class="LineNr">343 </span> <span class="Comment"># size the exit-descriptor for the call to get-num below</span>
<span id="L344" class="LineNr">344 </span> <span class="Comment"># tailor-exit-descriptor(ed, 16)</span>
<span id="L345" class="LineNr">345 </span> <span class="Comment"># push args</span>
<span id="L346" class="LineNr">346 </span> 68/push 0x10/imm32/nbytes-of-args-for-get-num
<span id="L347" class="LineNr">347 </span> 50/push-EAX/ed
<span id="L348" class="LineNr">348 </span> <span class="Comment"># call</span>
<span id="L349" class="LineNr">349 </span> e8/call tailor-exit-descriptor/disp32
<span id="L350" class="LineNr">350 </span> <span class="Comment"># discard args</span>
<span id="L351" class="LineNr">351 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L352" class="LineNr">352 </span> <span class="SalientComment">## prime the pump</span>
<span id="L353" class="LineNr">353 </span> <span class="Comment"># get-char(_test-buffered-file)</span>
<span id="L354" class="LineNr">354 </span> <span class="Comment"># push args</span>
<span id="L355" class="LineNr">355 </span> 68/push _test-buffered-file/imm32
<span id="L356" class="LineNr">356 </span> <span class="Comment"># call</span>
<span id="L357" class="LineNr">357 </span> e8/call get-char/disp32
<span id="L358" class="LineNr">358 </span> <span class="Comment"># discard args</span>
<span id="L359" class="LineNr">359 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L360" class="LineNr">360 </span> <span class="SalientComment">## get-num(in, out, err, ed)</span>
<span id="L361" class="LineNr">361 </span> <span class="Comment"># push args</span>
<span id="L362" class="LineNr">362 </span> 50/push-EAX/ed
<span id="L363" class="LineNr">363 </span> 68/push _test-error-stream/imm32
<span id="L364" class="LineNr">364 </span> 68/push _test-output-stream/imm32
<span id="L365" class="LineNr">365 </span> 68/push _test-buffered-file/imm32
<span id="L366" class="LineNr">366 </span> <span class="Comment"># call</span>
<span id="L367" class="LineNr">367 </span> e8/call get-num/disp32
<span id="L368" class="LineNr">368 </span> <span class="SalientComment">## registers except ESP may be clobbered at this point</span>
<span id="L369" class="LineNr">369 </span> <span class="Comment"># discard args</span>
<span id="L370" class="LineNr">370 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/imm32 <span class="Comment"># add to ESP</span>
<span id="L371" class="LineNr">371 </span> <span class="Comment"># check-ints-equal(*_test-output-stream.data, '3')</span>
<span id="L372" class="LineNr">372 </span> <span class="Comment"># push args</span>
<span id="L373" class="LineNr">373 </span> 68/push <span class="Constant">"F - test-get-num-reads-single-digit"</span>/imm32
<span id="L374" class="LineNr">374 </span> 68/push 0x33/imm32
<span id="L375" class="LineNr">375 </span> b8/copy-to-EAX _test-output-stream/imm32
<span id="L376" class="LineNr">376 </span> ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EAX+12)</span>
<span id="L377" class="LineNr">377 </span> <span class="Comment"># call</span>
<span id="L378" class="LineNr">378 </span> e8/call check-ints-equal/disp32
<span id="L379" class="LineNr">379 </span> <span class="Comment"># discard args</span>
<span id="L380" class="LineNr">380 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L381" class="LineNr">381 </span> <span class="Comment"># reclaim locals</span>
<span id="L382" class="LineNr">382 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L383" class="LineNr">383 </span> 5d/pop-to-EBP
<span id="L384" class="LineNr">384 </span> c3/return
<span id="L385" class="LineNr">385 </span>
<span id="L386" class="LineNr">386 </span>test-get-num-aborts-on-non-digit-in-Look:
<span id="L387" class="LineNr">387 </span> <span class="SalientComment">## check that get-num returns first character if it's a digit</span>
<span id="L388" class="LineNr">388 </span> <span class="Comment"># This test uses exit-descriptors. Use EBP for setting up local variables.</span>
<span id="L389" class="LineNr">389 </span> 55/push-EBP
<span id="L390" class="LineNr">390 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L391" class="LineNr">391 </span> <span class="SalientComment">## clear all streams</span>
<span id="L392" class="LineNr">392 </span> <span class="Comment"># clear-stream(_test-stream)</span>
<span id="L393" class="LineNr">393 </span> <span class="Comment"># push args</span>
<span id="L394" class="LineNr">394 </span> 68/push _test-stream/imm32
<span id="L395" class="LineNr">395 </span> <span class="Comment"># call</span>
<span id="L396" class="LineNr">396 </span> e8/call clear-stream/disp32
<span id="L397" class="LineNr">397 </span> <span class="Comment"># discard args</span>
<span id="L398" class="LineNr">398 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L399" class="LineNr">399 </span> <span class="Comment"># clear-stream(_test-buffered-file+4)</span>
<span id="L400" class="LineNr">400 </span> <span class="Comment"># push args</span>
<span id="L401" class="LineNr">401 </span> b8/copy-to-EAX _test-buffered-file/imm32
<span id="L402" class="LineNr">402 </span> 05/add-to-EAX 4/imm32
<span id="L403" class="LineNr">403 </span> 50/push-EAX
<span id="L404" class="LineNr">404 </span> <span class="Comment"># call</span>
<span id="L405" class="LineNr">405 </span> e8/call clear-stream/disp32
<span id="L406" class="LineNr">406 </span> <span class="Comment"># discard args</span>
<span id="L407" class="LineNr">407 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L408" class="LineNr">408 </span> <span class="Comment"># clear-stream(_test-output-stream)</span>
<span id="L409" class="LineNr">409 </span> <span class="Comment"># push args</span>
<span id="L410" class="LineNr">410 </span> 68/push _test-output-stream/imm32
<span id="L411" class="LineNr">411 </span> <span class="Comment"># call</span>
<span id="L412" class="LineNr">412 </span> e8/call clear-stream/disp32
<span id="L413" class="LineNr">413 </span> <span class="Comment"># discard args</span>
<span id="L414" class="LineNr">414 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L415" class="LineNr">415 </span> <span class="Comment"># clear-stream(_test-error-stream)</span>
<span id="L416" class="LineNr">416 </span> <span class="Comment"># push args</span>
<span id="L417" class="LineNr">417 </span> 68/push _test-error-stream/imm32
<span id="L418" class="LineNr">418 </span> <span class="Comment"># call</span>
<span id="L419" class="LineNr">419 </span> e8/call clear-stream/disp32
<span id="L420" class="LineNr">420 </span> <span class="Comment"># discard args</span>
<span id="L421" class="LineNr">421 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L422" class="LineNr">422 </span> <span class="SalientComment">## initialize 'in'</span>
<span id="L423" class="LineNr">423 </span> <span class="Comment"># write(_test-stream, "3")</span>
<span id="L424" class="LineNr">424 </span> <span class="Comment"># push args</span>
<span id="L425" class="LineNr">425 </span> 68/push <span class="Constant">"3"</span>/imm32
<span id="L426" class="LineNr">426 </span> 68/push _test-stream/imm32
<span id="L427" class="LineNr">427 </span> <span class="Comment"># call</span>
<span id="L428" class="LineNr">428 </span> e8/call write/disp32
<span id="L429" class="LineNr">429 </span> <span class="Comment"># discard args</span>
<span id="L430" class="LineNr">430 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L431" class="LineNr">431 </span> <span class="SalientComment">## initialize exit-descriptor 'ed'</span>
<span id="L432" class="LineNr">432 </span> <span class="Comment"># allocate on stack</span>
<span id="L433" class="LineNr">433 </span> <span class="Comment"># var ed/EAX : (address exit-descriptor)</span>
<span id="L434" class="LineNr">434 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># subtract from ESP</span>
<span id="L435" class="LineNr">435 </span> 8d/copy-address 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EAX</span>
<span id="L436" class="LineNr">436 </span> <span class="Comment"># size the exit-descriptor for the call to get-num below</span>
<span id="L437" class="LineNr">437 </span> <span class="Comment"># tailor-exit-descriptor(ed, 16)</span>
<span id="L438" class="LineNr">438 </span> <span class="Comment"># push args</span>
<span id="L439" class="LineNr">439 </span> 68/push 0x10/imm32/nbytes-of-args-for-get-num
<span id="L440" class="LineNr">440 </span> 50/push-EAX/ed
<span id="L441" class="LineNr">441 </span> <span class="Comment"># call</span>
<span id="L442" class="LineNr">442 </span> e8/call tailor-exit-descriptor/disp32
<span id="L443" class="LineNr">443 </span> <span class="Comment"># discard args</span>
<span id="L444" class="LineNr">444 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L445" class="LineNr">445 </span> <span class="SalientComment">## don't initialize Look</span>
<span id="L446" class="LineNr">446 </span> <span class="SalientComment">## get-num(in, out, err, ed)</span>
<span id="L447" class="LineNr">447 </span> <span class="Comment"># push args</span>
<span id="L448" class="LineNr">448 </span> 50/push-EAX/ed
<span id="L449" class="LineNr">449 </span> 68/push _test-error-stream/imm32
<span id="L450" class="LineNr">450 </span> 68/push _test-output-stream/imm32
<span id="L451" class="LineNr">451 </span> 68/push _test-buffered-file/imm32
<span id="L452" class="LineNr">452 </span> <span class="Comment"># call</span>
<span id="L453" class="LineNr">453 </span> e8/call get-num/disp32
<span id="L454" class="LineNr">454 </span> <span class="SalientComment">## registers except ESP may be clobbered at this point</span>
<span id="L455" class="LineNr">455 </span> <span class="Comment"># discard args</span>
<span id="L456" class="LineNr">456 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/imm32 <span class="Comment"># add to ESP</span>
<span id="L457" class="LineNr">457 </span> <span class="SalientComment">## check that get-num tried to call exit(1)</span>
<span id="L458" class="LineNr">458 </span> <span class="Comment"># check-ints-equal(ed->value, 2, msg) # i.e. stop was called with value 1</span>
<span id="L459" class="LineNr">459 </span> <span class="Comment"># push args</span>
<span id="L460" class="LineNr">460 </span> 68/push <span class="Constant">"F - test-get-num-aborts-on-non-digit-in-Look"</span>/imm32
<span id="L461" class="LineNr">461 </span> 68/push 2/imm32
<span id="L462" class="LineNr">462 </span> <span class="Comment"># push ed->value</span>
<span id="L463" class="LineNr">463 </span> ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EAX+4)</span>
<span id="L464" class="LineNr">464 </span> <span class="Comment"># call</span>
<span id="L465" class="LineNr">465 </span> e8/call check-ints-equal/disp32
<span id="L466" class="LineNr">466 </span> <span class="Comment"># discard args</span>
<span id="L467" class="LineNr">467 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L468" class="LineNr">468 </span> <span class="Comment"># reclaim locals</span>
<span id="L469" class="LineNr">469 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L470" class="LineNr">470 </span> 5d/pop-to-EBP
<span id="L471" class="LineNr">471 </span> c3/return
<span id="L472" class="LineNr">472 </span>
<span id="L473" class="LineNr">473 </span><span class="SalientComment">## helpers</span>
<span id="L474" class="LineNr">474 </span>
<span id="L475" class="LineNr">475 </span><span class="Comment"># write(f, "Error: "+s+" expected\n") then stop(ed, 1)</span>
<span id="L476" class="LineNr">476 </span>expected: <span class="Comment"># ed : (address exit-descriptor), f : fd or (address stream), s : (address array byte) -> <void></span>
<span id="L477" class="LineNr">477 </span> <span class="Comment"># prolog</span>
<span id="L478" class="LineNr">478 </span> 55/push-EBP
<span id="L479" class="LineNr">479 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L480" class="LineNr">480 </span> <span class="Comment"># write(f, "Error: ")</span>
<span id="L481" class="LineNr">481 </span> <span class="Comment"># push args</span>
<span id="L482" class="LineNr">482 </span> 68/push <span class="Constant">"Error: "</span>/imm32
<span id="L483" class="LineNr">483 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L484" class="LineNr">484 </span> <span class="Comment"># call</span>
<span id="L485" class="LineNr">485 </span> e8/call write/disp32
<span id="L486" class="LineNr">486 </span> <span class="Comment"># discard args</span>
<span id="L487" class="LineNr">487 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L488" class="LineNr">488 </span> <span class="Comment"># write(f, s)</span>
<span id="L489" class="LineNr">489 </span> <span class="Comment"># push args</span>
<span id="L490" class="LineNr">490 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+16)</span>
<span id="L491" class="LineNr">491 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L492" class="LineNr">492 </span> <span class="Comment"># call</span>
<span id="L493" class="LineNr">493 </span> e8/call write/disp32
<span id="L494" class="LineNr">494 </span> <span class="Comment"># discard args</span>
<span id="L495" class="LineNr">495 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L496" class="LineNr">496 </span> <span class="Comment"># write(f, " expected")</span>
<span id="L497" class="LineNr">497 </span> <span class="Comment"># push args</span>
<span id="L498" class="LineNr">498 </span> 68/push <span class="Constant">" expected"</span>/imm32
<span id="L499" class="LineNr">499 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L500" class="LineNr">500 </span> <span class="Comment"># call</span>
<span id="L501" class="LineNr">501 </span> e8/call write/disp32
<span id="L502" class="LineNr">502 </span> <span class="Comment"># discard args</span>
<span id="L503" class="LineNr">503 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L504" class="LineNr">504 </span> <span class="Comment"># write(f, Newline)</span>
<span id="L505" class="LineNr">505 </span> <span class="Comment"># push args</span>
<span id="L506" class="LineNr">506 </span> 68/push <span class="Special">Newline</span>/imm32
<span id="L507" class="LineNr">507 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L508" class="LineNr">508 </span> <span class="Comment"># call</span>
<span id="L509" class="LineNr">509 </span> e8/call write/disp32
<span id="L510" class="LineNr">510 </span> <span class="Comment"># discard args</span>
<span id="L511" class="LineNr">511 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L512" class="LineNr">512 </span> <span class="Comment"># stop(ed, 1)</span>
<span id="L513" class="LineNr">513 </span> <span class="Comment"># push args</span>
<span id="L514" class="LineNr">514 </span> 68/push 1/imm32
<span id="L515" class="LineNr">515 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L516" class="LineNr">516 </span> <span class="Comment"># call</span>
<span id="L517" class="LineNr">517 </span> e8/call stop/disp32
<span id="L518" class="LineNr">518 </span> <span class="SalientComment">## should never get past this point</span>
<span id="L519" class="LineNr">519 </span> <span class="Comment"># epilog</span>
<span id="L520" class="LineNr">520 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L521" class="LineNr">521 </span> 5d/pop-to-EBP
<span id="L522" class="LineNr">522 </span> c3/return
<span id="L523" class="LineNr">523 </span>
<span id="L524" class="LineNr">524 </span><span class="Comment"># write(f, "Error: "+s+"\n") then stop(ed, 1)</span>
<span id="L525" class="LineNr">525 </span>error: <span class="Comment"># ed : (address exit-descriptor), f : fd or (address stream), s : (address array byte) -> <void></span>
<span id="L526" class="LineNr">526 </span> <span class="Comment"># prolog</span>
<span id="L527" class="LineNr">527 </span> 55/push-EBP
<span id="L528" class="LineNr">528 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L529" class="LineNr">529 </span> <span class="Comment"># write(f, "Error: ")</span>
<span id="L530" class="LineNr">530 </span> <span class="Comment"># push args</span>
<span id="L531" class="LineNr">531 </span> 68/push <span class="Constant">"Error: "</span>/imm32
<span id="L532" class="LineNr">532 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L533" class="LineNr">533 </span> <span class="Comment"># call</span>
<span id="L534" class="LineNr">534 </span> e8/call write/disp32
<span id="L535" class="LineNr">535 </span> <span class="Comment"># discard args</span>
<span id="L536" class="LineNr">536 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L537" class="LineNr">537 </span> <span class="Comment"># write(f, s)</span>
<span id="L538" class="LineNr">538 </span> <span class="Comment"># push args</span>
<span id="L539" class="LineNr">539 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+16)</span>
<span id="L540" class="LineNr">540 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L541" class="LineNr">541 </span> <span class="Comment"># call</span>
<span id="L542" class="LineNr">542 </span> e8/call write/disp32
<span id="L543" class="LineNr">543 </span> <span class="Comment"># discard args</span>
<span id="L544" class="LineNr">544 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L545" class="LineNr">545 </span> <span class="Comment"># write(f, Newline)</span>
<span id="L546" class="LineNr">546 </span> <span class="Comment"># push args</span>
<span id="L547" class="LineNr">547 </span> 68/push <span class="Special">Newline</span>/imm32
<span id="L548" class="LineNr">548 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span>
<span id="L549" class="LineNr">549 </span> <span class="Comment"># call</span>
<span id="L550" class="LineNr">550 </span> e8/call write/disp32
<span id="L551" class="LineNr">551 </span> <span class="Comment"># discard args</span>
<span id="L552" class="LineNr">552 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L553" class="LineNr">553 </span> <span class="Comment"># stop(ed, 1)</span>
<span id="L554" class="LineNr">554 </span> <span class="Comment"># push args</span>
<span id="L555" class="LineNr">555 </span> 68/push 1/imm32
<span id="L556" class="LineNr">556 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L557" class="LineNr">557 </span> <span class="Comment"># call</span>
<span id="L558" class="LineNr">558 </span> e8/call stop/disp32
<span id="L559" class="LineNr">559 </span> <span class="SalientComment">## should never get past this point</span>
<span id="L560" class="LineNr">560 </span> <span class="Comment"># epilog</span>
<span id="L561" class="LineNr">561 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L562" class="LineNr">562 </span> 5d/pop-to-EBP
<span id="L563" class="LineNr">563 </span> c3/return
<span id="L564" class="LineNr">564 </span>
<span id="L565" class="LineNr">565 </span><span class="Comment"># read a byte from 'f', and store it in 'Look'</span>
<span id="L566" class="LineNr">566 </span>get-char: <span class="Comment"># f : (address buffered-file) -> <void></span>
<span id="L567" class="LineNr">567 </span> <span class="Comment"># prolog</span>
<span id="L568" class="LineNr">568 </span> 55/push-EBP
<span id="L569" class="LineNr">569 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L570" class="LineNr">570 </span> <span class="Comment"># save registers</span>
<span id="L571" class="LineNr">571 </span> 50/push-EAX
<span id="L572" class="LineNr">572 </span> <span class="Comment"># read-byte(f)</span>
<span id="L573" class="LineNr">573 </span> <span class="Comment"># push args</span>
<span id="L574" class="LineNr">574 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span>
<span id="L575" class="LineNr">575 </span> <span class="Comment"># call</span>
<span id="L576" class="LineNr">576 </span> e8/call read-byte/disp32
<span id="L577" class="LineNr">577 </span> <span class="Comment"># discard args</span>
<span id="L578" class="LineNr">578 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L579" class="LineNr">579 </span> <span class="Comment"># save EAX to Look</span>
<span id="L580" class="LineNr">580 </span> 89/copy 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX <span class="Special">Look</span>/disp32 <span class="Delimiter"> . </span> <span class="Comment"># copy EAX to *Look</span>
<span id="L581" class="LineNr">581 </span> <span class="Comment"># restore registers</span>
<span id="L582" class="LineNr">582 </span> 58/pop-to-EAX
<span id="L583" class="LineNr">583 </span> <span class="Comment"># epilog</span>
<span id="L584" class="LineNr">584 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L585" class="LineNr">585 </span> 5d/pop-to-EBP
<span id="L586" class="LineNr">586 </span> c3/return
<span id="L587" class="LineNr">587 </span>
<span id="L588" class="LineNr">588 </span>is-digit?: <span class="Comment"># c : int -> bool/EAX</span>
<span id="L589" class="LineNr">589 </span> <span class="Comment"># prolog</span>
<span id="L590" class="LineNr">590 </span> 55/push-EBP
<span id="L591" class="LineNr">591 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L592" class="LineNr">592 </span> <span class="Comment"># EAX = false</span>
<span id="L593" class="LineNr">593 </span> b8/copy-to-EAX 0/imm32
<span id="L594" class="LineNr">594 </span> <span class="Comment"># if c < '0' return false</span>
<span id="L595" class="LineNr">595 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x8/disp8 0x30/imm32 <span class="Comment"># compare *(EBP+8)</span>
<span id="L596" class="LineNr">596 </span> 7c/jump-if-lesser $is-digit?:end/disp8
<span id="L597" class="LineNr">597 </span> <span class="Comment"># if c > '9' return false</span>
<span id="L598" class="LineNr">598 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x8/disp8 0x39/imm32 <span class="Comment"># compare *(EBP+8)</span>
<span id="L599" class="LineNr">599 </span> 7f/jump-if-greater $is-digit?:end/disp8
<span id="L600" class="LineNr">600 </span> <span class="Comment"># otherwise return true</span>
<span id="L601" class="LineNr">601 </span> b8/copy-to-EAX 1/imm32
<span id="L602" class="LineNr">602 </span>$is-digit?:end:
<span id="L603" class="LineNr">603 </span> <span class="Comment"># epilog</span>
<span id="L604" class="LineNr">604 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L605" class="LineNr">605 </span> 5d/pop-to-EBP
<span id="L606" class="LineNr">606 </span> c3/return
<span id="L607" class="LineNr">607 </span>
<span id="L608" class="LineNr">608 </span>== data
<span id="L609" class="LineNr">609 </span>
<span id="L610" class="LineNr">610 </span><span class="Special">Look</span>:
<span id="L611" class="LineNr">611 </span> 00 00 00 00
<span id="L612" class="LineNr">612 </span>
<span id="L613" class="LineNr">613 </span>_test-output-stream:
<span id="L614" class="LineNr">614 </span> <span class="Comment"># current write index</span>
<span id="L615" class="LineNr">615 </span> 00 00 00 00
<span id="L616" class="LineNr">616 </span> <span class="Comment"># current read index</span>
<span id="L617" class="LineNr">617 </span> 00 00 00 00
<span id="L618" class="LineNr">618 </span> <span class="Comment"># length (= 8)</span>
<span id="L619" class="LineNr">619 </span> 08 00 00 00
<span id="L620" class="LineNr">620 </span> <span class="Comment"># data</span>
<span id="L621" class="LineNr">621 </span> 00 00 00 00 00 00 00 00 <span class="Comment"># 8 bytes</span>
<span id="L622" class="LineNr">622 </span>
<span id="L623" class="LineNr">623 </span>_test-error-stream:
<span id="L624" class="LineNr">624 </span> <span class="Comment"># current write index</span>
<span id="L625" class="LineNr">625 </span> 00 00 00 00
<span id="L626" class="LineNr">626 </span> <span class="Comment"># current read index</span>
<span id="L627" class="LineNr">627 </span> 00 00 00 00
<span id="L628" class="LineNr">628 </span> <span class="Comment"># length (= 8)</span>
<span id="L629" class="LineNr">629 </span> 08 00 00 00
<span id="L630" class="LineNr">630 </span> <span class="Comment"># data</span>
<span id="L631" class="LineNr">631 </span> 00 00 00 00 00 00 00 00 <span class="Comment"># 8 bytes</span>
<span id="L632" class="LineNr">632 </span>
<span id="L633" class="LineNr">633 </span><span class="Comment"># vim:nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|