akkartik
/
mu
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
mu/html/apps/braces.subx.html

705 lines
62 KiB
HTML
Raw Normal View History

5683
2019-09-20 18:19:30 +00:00
<!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/braces.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,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { white-space: pre-wrap; 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; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.SpecialChar { color: #d70000; }
.Constant { color: #008787; }
.Folded { color: #080808; background-color: #949494; }
.subxTest { color: #5f8700; }
.subxS2Comment { color: #8a8a8a; }
-->
</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/braces.subx'>https://github.com/akkartik/mu/blob/master/apps/braces.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Structured control flow using break/loop rather than jump.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run (on Linux):</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ ./ntranslate init.linux 0*.subx apps/subx-params.subx apps/braces.subx</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ mv a.elf apps/braces</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># Example 1:</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># $ cat x.subx</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># {</span>
<span id="L10" class="LineNr"> 10 </span><span class="subxComment"># 7c/if-lesser break/disp8</span>
<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># 74/if-equal loop/disp8</span>
<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># }</span>
<span id="L13" class="LineNr"> 13 </span><span class="subxComment"># $ cat x.subx |apps/braces</span>
<span id="L14" class="LineNr"> 14 </span><span class="subxComment"># _loop1:</span>
<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># 7c/if-lesser _break1/disp8</span>
<span id="L16" class="LineNr"> 16 </span><span class="subxComment"># 74/if-equal _loop1/disp8</span>
<span id="L17" class="LineNr"> 17 </span><span class="subxComment"># _break1:</span>
<span id="L18" class="LineNr"> 18 </span><span class="subxComment">#</span>
<span id="L19" class="LineNr"> 19 </span><span class="subxComment"># Example 2:</span>
<span id="L20" class="LineNr"> 20 </span><span class="subxComment"># $ cat x.subx</span>
<span id="L21" class="LineNr"> 21 </span><span class="subxComment"># {</span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># 7c/if-lesser break/disp8</span>
<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># }</span>
<span id="L24" class="LineNr"> 24 </span><span class="subxComment"># {</span>
<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># 74/if-equal loop/disp8</span>
<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># }</span>
<span id="L27" class="LineNr"> 27 </span><span class="subxComment"># $ cat x.subx |apps/braces</span>
<span id="L28" class="LineNr"> 28 </span><span class="subxComment"># _loop1:</span>
<span id="L29" class="LineNr"> 29 </span><span class="subxComment"># 7c/if-lesser _break1/disp8</span>
<span id="L30" class="LineNr"> 30 </span><span class="subxComment"># _break1:</span>
<span id="L31" class="LineNr"> 31 </span><span class="subxComment"># _loop2:</span>
<span id="L32" class="LineNr"> 32 </span><span class="subxComment"># 74/if-equal _loop2/disp8</span>
<span id="L33" class="LineNr"> 33 </span><span class="subxComment"># _break2:</span>
<span id="L34" class="LineNr"> 34 </span><span class="subxComment">#</span>
<span id="L35" class="LineNr"> 35 </span><span class="subxComment"># Example 3:</span>
<span id="L36" class="LineNr"> 36 </span><span class="subxComment"># $ cat x.subx</span>
<span id="L37" class="LineNr"> 37 </span><span class="subxComment"># {</span>
<span id="L38" class="LineNr"> 38 </span><span class="subxComment"># {</span>
<span id="L39" class="LineNr"> 39 </span><span class="subxComment"># 74/if-equal loop/disp8</span>
<span id="L40" class="LineNr"> 40 </span><span class="subxComment"># }</span>
<span id="L41" class="LineNr"> 41 </span><span class="subxComment"># 7c/if-lesser loop/disp8</span>
<span id="L42" class="LineNr"> 42 </span><span class="subxComment"># }</span>
<span id="L43" class="LineNr"> 43 </span><span class="subxComment"># $ cat x.subx |apps/braces</span>
<span id="L44" class="LineNr"> 44 </span><span class="subxComment"># _loop1:</span>
<span id="L45" class="LineNr"> 45 </span><span class="subxComment"># _loop2:</span>
<span id="L46" class="LineNr"> 46 </span><span class="subxComment"># 74/if-equal _loop2/disp8</span>
<span id="L47" class="LineNr"> 47 </span><span class="subxComment"># _break2:</span>
<span id="L48" class="LineNr"> 48 </span><span class="subxComment"># 7c/if-lesser _loop1/disp8</span>
<span id="L49" class="LineNr"> 49 </span><span class="subxComment"># _break1:</span>
<span id="L50" class="LineNr"> 50 </span>
<span id="L51" class="LineNr"> 51 </span>== code
<span id="L52" class="LineNr"> 52 </span>
<span id="L53" class="LineNr"> 53 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># run tests if necessary, a REPL if not</span>
<span id="L54" class="LineNr"> 54 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L55" class="LineNr"> 55 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L56" class="LineNr"> 56 </span> <span class="subxComment"># initialize heap</span>
<span id="L57" class="LineNr"> 57 </span> (new-segment <span class="SpecialChar"><a href='../069allocate.subx.html#L29'>Heap-size</a></span> <span class="SpecialChar"><a href='../069allocate.subx.html#L22'>Heap</a></span>)
<span id="L58" class="LineNr"> 58 </span> <span class="subxComment"># if (argc &lt;= 1) goto interactive</span>
<span id="L59" class="LineNr"> 59 </span> 81 7/subop/compare *ebp 1/imm32
<span id="L60" class="LineNr"> 60 </span> 7e/jump-if-lesser-or-equal $subx-braces-main:interactive/disp8
<span id="L61" class="LineNr"> 61 </span> <span class="subxComment"># if (argv[1] != &quot;test&quot;)) goto interactive</span>
<span id="L62" class="LineNr"> 62 </span> (kernel-string-equal? *(ebp+8) <span class="Constant">&quot;test&quot;</span>) <span class="subxComment"># =&gt; eax</span>
<span id="L63" class="LineNr"> 63 </span> 3d/compare-eax-and 0/imm32
<span id="L64" class="LineNr"> 64 </span> 74/jump-if-equal $subx-braces-main:interactive/disp8
<span id="L65" class="LineNr"> 65 </span> <span class="subxComment">#</span>
<span id="L66" class="LineNr"> 66 </span> (run-tests)
<span id="L67" class="LineNr"> 67 </span> <span class="subxComment"># syscall(exit, *Num-test-failures)</span>
<span id="L68" class="LineNr"> 68 </span> 8b/-&gt; *<span class="SpecialChar"><a href='../051test.subx.html#L90'>Num-test-failures</a></span> 3/r32/ebx
<span id="L69" class="LineNr"> 69 </span> eb/jump $subx-braces-main:end/disp8
<span id="L70" class="LineNr"> 70 </span><span class="Constant">$subx-braces-main:interactive</span>:
<span id="L71" class="LineNr"> 71 </span> (subx-braces <span class="SpecialChar"><a href='../061read-byte.subx.html#L14'>Stdin</a></span> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L72" class="LineNr"> 72 </span> <span class="subxComment"># syscall(exit, 0)</span>
<span id="L73" class="LineNr"> 73 </span> bb/copy-to-ebx 0/imm32
<span id="L74" class="LineNr"> 74 </span><span class="Constant">$subx-braces-main:end</span>:
<span id="L75" class="LineNr"> 75 </span> b8/copy-to-eax 1/imm32/exit
<span id="L76" class="LineNr"> 76 </span> cd/syscall 0x80/imm8
<span id="L77" class="LineNr"> 77 </span>
<span id="L78" class="LineNr"> 78 </span><span class="subxFunction">subx-braces</span>: <span class="subxComment"># in : (address buffered-file), out : (address buffered-file) -&gt; &lt;void&gt;</span>
<span id="L79" class="LineNr"> 79 </span> <span class="subxComment"># pseudocode:</span>
<span id="L80" class="LineNr"> 80 </span> <span class="subxComment"># var line = new-stream(512, 1)</span>
<span id="L81" class="LineNr"> 81 </span> <span class="subxComment"># var label-stack : (address stack) = new-stack(32*4) # at most 32 levels of nesting</span>
<span id="L82" class="LineNr"> 82 </span> <span class="subxComment"># var next-label-id : int = 1</span>
<span id="L83" class="LineNr"> 83 </span> <span class="subxComment"># while true</span>
<span id="L84" class="LineNr"> 84 </span> <span class="subxComment"># clear-stream(line)</span>
<span id="L85" class="LineNr"> 85 </span> <span class="subxComment"># read-line-buffered(in, line)</span>
<span id="L86" class="LineNr"> 86 </span> <span class="subxComment"># if (line-&gt;write == 0) break # end of file</span>
<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># skip-chars-matching-whitespace(line)</span>
<span id="L88" class="LineNr"> 88 </span> <span class="subxComment"># if line-&gt;data[line-&gt;read] == '{'</span>
<span id="L89" class="LineNr"> 89 </span> <span class="subxComment"># print(out, &quot;_loop&quot; next-label-id &quot;:\n&quot;)</span>
<span id="L90" class="LineNr"> 90 </span> <span class="subxComment"># push(label-stack, next-label-id)</span>
<span id="L91" class="LineNr"> 91 </span> <span class="subxComment"># ++next-label-id</span>
<span id="L92" class="LineNr"> 92 </span> <span class="subxComment"># continue</span>
<span id="L93" class="LineNr"> 93 </span> <span class="subxComment"># if line-&gt;data[line-&gt;read] == '}'</span>
<span id="L94" class="LineNr"> 94 </span> <span class="subxComment"># var top = pop(label-stack)</span>
<span id="L95" class="LineNr"> 95 </span> <span class="subxComment"># print(out, &quot;_break&quot; top &quot;:\n&quot;)</span>
<span id="L96" class="LineNr"> 96 </span> <span class="subxComment"># continue</span>
<span id="L97" class="LineNr"> 97 </span> <span class="subxComment"># while true</span>
<span id="L98" class="LineNr"> 98 </span> <span class="subxComment"># var word-slice : (address slice) = next-word-or-string(line)</span>
<span id="L99" class="LineNr"> 99 </span> <span class="subxComment"># if slice-empty?(word-slice) # end of line</span>
<span id="L100" class="LineNr">100 </span> <span class="subxComment"># break</span>
<span id="L101" class="LineNr">101 </span> <span class="subxComment"># if slice-starts-with?(word-slice, &quot;#&quot;) # comment</span>
<span id="L102" class="LineNr">102 </span> <span class="subxComment"># continue</span>
<span id="L103" class="LineNr">103 </span> <span class="subxComment"># if slice-starts-with?(word-slice, &quot;break/&quot;)</span>
<span id="L104" class="LineNr">104 </span> <span class="subxComment"># var top = top(label-stack)</span>
<span id="L105" class="LineNr">105 </span> <span class="subxComment"># print(out, &quot;_break&quot; top)</span>
<span id="L106" class="LineNr">106 </span> <span class="subxComment"># word-slice-&gt;start += len(&quot;break&quot;)</span>
<span id="L107" class="LineNr">107 </span> <span class="subxComment"># else if slice-starts-with?(word-slice, &quot;loop/&quot;)</span>
<span id="L108" class="LineNr">108 </span> <span class="subxComment"># var top = top(label-stack)</span>
<span id="L109" class="LineNr">109 </span> <span class="subxComment"># print(out, &quot;_loop&quot; top)</span>
<span id="L110" class="LineNr">110 </span> <span class="subxComment"># word-slice-&gt;start += len(&quot;loop&quot;)</span>
<span id="L111" class="LineNr">111 </span> <span class="subxComment"># print(out, word-slice &quot; &quot;)</span>
<span id="L112" class="LineNr">112 </span> <span class="subxComment"># print(out, &quot;\n&quot;)</span>
<span id="L113" class="LineNr">113 </span> <span class="subxComment"># flush(out)</span>
<span id="L114" class="LineNr">114 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L115" class="LineNr">115 </span> 55/push-ebp
<span id="L116" class="LineNr">116 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L117" class="LineNr">117 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L118" class="LineNr">118 </span> 50/push-eax
<span id="L119" class="LineNr">119 </span> 51/push-ecx
<span id="L120" class="LineNr">120 </span> 52/push-edx
<span id="L121" class="LineNr">121 </span> 53/push-ebx
<span id="L122" class="LineNr">122 </span> 56/push-esi
<span id="L123" class="LineNr">123 </span> 57/push-edi
<span id="L124" class="LineNr">124 </span> <span class="subxComment"># esi = in</span>
<span id="L125" class="LineNr">125 </span> 8b/-&gt; *(ebp+8) 6/r32/esi
<span id="L126" class="LineNr">126 </span> <span class="subxComment"># var line/ecx : (address stream byte) = stream(512)</span>
<span id="L127" class="LineNr">127 </span> 81 5/subop/subtract %esp 0x200/imm32
<span id="L128" class="LineNr">128 </span> 68/push 0x200/imm32/length
<span id="L129" class="LineNr">129 </span> 68/push 0/imm32/read
<span id="L130" class="LineNr">130 </span> 68/push 0/imm32/write
<span id="L131" class="LineNr">131 </span> 89/&lt;- %ecx 4/r32/esp
<span id="L132" class="LineNr">132 </span> <span class="subxComment"># var label-stack/edx : (address stack)</span>
<span id="L133" class="LineNr">133 </span> 81 5/subop/subtract %esp 0x80/imm32
<span id="L134" class="LineNr">134 </span> 68/push 0x80/imm32/length
<span id="L135" class="LineNr">135 </span> 68/push 0/imm32/top
<span id="L136" class="LineNr">136 </span> 89/&lt;- %edx 4/r32/esp
<span id="L137" class="LineNr">137 </span> <span class="subxComment"># next-label-id/ebx = 1</span>
<span id="L138" class="LineNr">138 </span> c7 0/subop/copy %ebx 1/imm32
<span id="L139" class="LineNr">139 </span> <span class="subxComment"># var word-slice/edi = {0, 0}</span>
<span id="L140" class="LineNr">140 </span> 68/push 0/imm32/end
<span id="L141" class="LineNr">141 </span> 68/push 0/imm32/start
<span id="L142" class="LineNr">142 </span> 89/&lt;- %edi 4/r32/esp
<span id="L143" class="LineNr">143 </span><span class="Constant">$subx-braces:line-loop</span>:
<span id="L144" class="LineNr">144 </span> (clear-stream %ecx)
<span id="L145" class="LineNr">145 </span> (read-line-buffered %esi %ecx)
<span id="L146" class="LineNr">146 </span><span class="Constant">$subx-braces:check0</span>:
<span id="L147" class="LineNr">147 </span> <span class="subxComment"># if (line-&gt;write == 0) break</span>
<span id="L148" class="LineNr">148 </span> 81 7/subop/compare *ecx 0/imm32
<span id="L149" class="LineNr">149 </span> 0f 84/jump-if-equal $subx-braces:<span class="Constant">break</span>/disp32
<span id="L150" class="LineNr">150 </span> (skip-chars-matching-whitespace %ecx)
<span id="L151" class="LineNr">151 </span><span class="Constant">$subx-braces:check-for-curly-open</span>:
<span id="L152" class="LineNr">152 </span> <span class="subxComment"># if (line-&gt;data[line-&gt;read] != '{') goto next check</span>
<span id="L153" class="LineNr">153 </span> <span class="subxS1Comment"># . eax = line-&gt;data[line-&gt;read]</span>
<span id="L154" class="LineNr">154 </span> 8b/-&gt; *(ecx+4) 0/r32/eax
<span id="L155" class="LineNr">155 </span> 8a/copy-byte *(ecx+eax+0xc) 0/r32/AL
<span id="L156" class="LineNr">156 </span> 81 4/subop/and %eax 0xff/imm32
<span id="L157" class="LineNr">157 </span> <span class="subxS1Comment"># . if (eax != '{') continue</span>
<span id="L158" class="LineNr">158 </span> 3d/compare-eax-and 0x7b/imm32/open-curly
<span id="L159" class="LineNr">159 </span> 0f 85/jump-if-not-equal $subx-braces:check-for-curly-closed/disp32
<span id="L160" class="LineNr">160 </span><span class="Constant">$subx-braces:emit-curly-open</span>:
<span id="L161" class="LineNr">161 </span> <span class="subxComment"># print(out, &quot;_loop&quot; next-label-id &quot;:&quot;)</span>
<span id="L162" class="LineNr">162 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;_loop&quot;</span>)
<span id="L163" class="LineNr">163 </span> (print-int32-buffered *(ebp+0xc) %ebx)
<span id="L164" class="LineNr">164 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;:&quot;</span>)
<span id="L165" class="LineNr">165 </span> <span class="subxComment"># push(label-stack, next-label-id)</span>
<span id="L166" class="LineNr">166 </span> (push %edx %ebx)
<span id="L167" class="LineNr">167 </span> <span class="subxComment"># ++next-label-id</span>
<span id="L168" class="LineNr">168 </span> ff 0/subop/increment %ebx
<span id="L169" class="LineNr">169 </span> <span class="subxComment"># continue</span>
<span id="L170" class="LineNr">170 </span> e9/jump $subx-braces:next-line/disp32
<span id="L171" class="LineNr">171 </span><span class="Constant">$subx-braces:check-for-curly-closed</span>:
<span id="L172" class="LineNr">172 </span> <span class="subxComment"># if (line-&gt;data[line-&gt;read] != '}') goto next check</span>
<span id="L173" class="LineNr">173 </span> 3d/compare-eax-and 0x7d/imm32/close-curly
<span id="L174" class="LineNr">174 </span> 0f 85/jump-if-equal $subx-braces:word-loop/disp32
<span id="L175" class="LineNr">175 </span><span class="Constant">$subx-braces:emit-curly-closed</span>:
<span id="L176" class="LineNr">176 </span> <span class="subxComment"># eax = pop(label-stack)</span>
<span id="L177" class="LineNr">177 </span> (pop %edx)
<span id="L178" class="LineNr">178 </span> <span class="subxComment"># print(out, &quot;_break&quot; eax &quot;:&quot;)</span>
<span id="L179" class="LineNr">179 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;_break&quot;</span>)
<span id="L180" class="LineNr">180 </span> (print-int32-buffered *(ebp+0xc) %eax)
<span id="L181" class="LineNr">181 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;:&quot;</span>)
<span id="L182" class="LineNr">182 </span> <span class="subxComment"># continue</span>
<span id="L183" class="LineNr">183 </span> e9/jump $subx-braces:next-line/disp32
<span id="L184" class="LineNr">184 </span><span class="Constant">$subx-braces:word-loop</span>:
<span id="L185" class="LineNr">185 </span> (next-word-or-string %ecx %edi)
<span id="L186" class="LineNr">186 </span><span class="Constant">$subx-braces:check1</span>:
<span id="L187" class="LineNr">187 </span> <span class="subxComment"># if (slice-empty?(word-slice)) break</span>
<span id="L188" class="LineNr">188 </span> (slice-empty? %edi)
<span id="L189" class="LineNr">189 </span> 3d/compare-eax-and 0/imm32
<span id="L190" class="LineNr">190 </span> 0f 85/jump-if-not-equal $subx-braces:next-line/disp32
<span id="L191" class="LineNr">191 </span><span class="Constant">$subx-braces:check-for-comment</span>:
<span id="L192" class="LineNr">192 </span> <span class="subxComment"># if (slice-starts-with?(word-slice, &quot;#&quot;)) continue</span>
<span id="L193" class="LineNr">193 </span> <span class="subxS1Comment"># . eax = *word-slice-&gt;start</span>
<span id="L194" class="LineNr">194 </span> 8b/-&gt; *edi 0/r32/eax
<span id="L195" class="LineNr">195 </span> 8a/copy-byte *eax 0/r32/AL
<span id="L196" class="LineNr">196 </span> 81 4/subop/and %eax 0xff/imm32
<span id="L197" class="LineNr">197 </span> <span class="subxS1Comment"># . if (eax == '#') continue</span>
<span id="L198" class="LineNr">198 </span> 3d/compare-eax-and 0x23/imm32/hash
<span id="L199" class="LineNr">199 </span> 74/jump-if-equal $subx-braces:word-loop/disp8
<span id="L200" class="LineNr">200 </span><span class="Constant">$subx-braces:check-for-break</span>:
<span id="L201" class="LineNr">201 </span> <span class="subxComment"># if (!slice-starts-with?(word-slice, &quot;break/&quot;)) goto next check</span>
<span id="L202" class="LineNr">202 </span> <span class="subxS1Comment"># . eax = slice-starts-with?(word-slice, &quot;break/&quot;)</span>
<span id="L203" class="LineNr">203 </span> (slice-starts-with? %edi <span class="Constant">&quot;break/&quot;</span>)
<span id="L204" class="LineNr">204 </span> <span class="subxS1Comment"># . if (eax == 0) goto next check</span>
<span id="L205" class="LineNr">205 </span> 3d/compare-eax-and 0/imm32
<span id="L206" class="LineNr">206 </span> 74/jump-if-equal $subx-braces:check-for-loop/disp8
<span id="L207" class="LineNr">207 </span><span class="Constant">$subx-braces:emit-break</span>:
<span id="L208" class="LineNr">208 </span> (top %edx)
<span id="L209" class="LineNr">209 </span> <span class="subxComment"># print(out, &quot;_break&quot; eax)</span>
<span id="L210" class="LineNr">210 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;_break&quot;</span>)
<span id="L211" class="LineNr">211 </span> (print-int32-buffered *(ebp+0xc) %eax)
<span id="L212" class="LineNr">212 </span> <span class="subxComment"># word-slice-&gt;start += len(&quot;break&quot;)</span>
<span id="L213" class="LineNr">213 </span> 81 0/subop/add *edi 5/imm32/strlen
<span id="L214" class="LineNr">214 </span> <span class="subxComment"># emit rest of word as usual</span>
<span id="L215" class="LineNr">215 </span> eb/jump $subx-braces:emit-word-slice/disp8
<span id="L216" class="LineNr">216 </span><span class="Constant">$subx-braces:check-for-loop</span>:
<span id="L217" class="LineNr">217 </span> <span class="subxComment"># if (!slice-starts-with?(word-slice, &quot;loop/&quot;)) emit word</span>
<span id="L218" class="LineNr">218 </span> <span class="subxS1Comment"># . eax = slice-starts-with?(word-slice, &quot;loop/&quot;)</span>
<span id="L219" class="LineNr">219 </span> (slice-starts-with? %edi <span class="Constant">&quot;loop/&quot;</span>)
<span id="L220" class="LineNr">220 </span> <span class="subxS1Comment"># . if (eax == 0) goto next check</span>
<span id="L221" class="LineNr">221 </span> 3d/compare-eax-and 0/imm32
<span id="L222" class="LineNr">222 </span> 74/jump-if-equal $subx-braces:emit-word-slice/disp8
<span id="L223" class="LineNr">223 </span><span class="Constant">$subx-braces:emit-loop</span>:
<span id="L224" class="LineNr">224 </span> (top %edx)
<span id="L225" class="LineNr">225 </span> <span class="subxComment"># print(out, &quot;_loop&quot; eax)</span>
<span id="L226" class="LineNr">226 </span> (write-buffered *(ebp+0xc) <span class="Constant">&quot;_loop&quot;</span>)
<span id="L227" class="LineNr">227 </span> (print-int32-buffered *(ebp+0xc) %eax)
<span id="L228" class="LineNr">228 </span> <span class="subxComment"># word-slice-&gt;start += len(&quot;loop&quot;)</span>
<span id="L229" class="LineNr">229 </span> 81 0/subop/add *edi 4/imm32/strlen
<span id="L230" class="LineNr">230 </span> <span class="subxComment"># fall through</span>
<span id="L231" class="LineNr">231 </span><span class="Constant">$subx-braces:emit-word-slice</span>:
<span id="L232" class="LineNr">232 </span> <span class="subxComment"># print(out, word-slice &quot; &quot;)</span>
<span id="L233" class="LineNr">233 </span> (write-slice-buffered *(ebp+0xc) %edi)
<span id="L234" class="LineNr">234 </span> (write-buffered *(ebp+0xc) <span class="SpecialChar"><a href='../051test.subx.html#L94'>Space</a></span>)
<span id="L235" class="LineNr">235 </span> <span class="subxComment"># loop to next word</span>
<span id="L236" class="LineNr">236 </span> e9/jump $subx-braces:word-loop/disp32
<span id="L237" class="LineNr">237 </span><span class="Constant">$subx-braces:next-line</span>:
<span id="L238" class="LineNr">238 </span> <span class="subxComment"># print(out, &quot;\n&quot;)</span>
<span id="L239" class="LineNr">239 </span> (write-buffered *(ebp+0xc) <span class="SpecialChar"><a href='../051test.subx.html#L83'>Newline</a></span>)
<span id="L240" class="LineNr">240 </span> <span class="subxComment"># loop to next line</span>
<span id="L241" class="LineNr">241 </span> e9/jump $subx-braces:line-loop/disp32
<span id="L242" class="LineNr">242 </span><span class="Constant">$subx-braces:break</span>:
<span id="L243" class="LineNr">243 </span> (flush *(ebp+0xc))
<span id="L244" class="LineNr">244 </span><span class="Constant">$subx-braces:end</span>:
<span id="L245" class="LineNr">245 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L246" class="LineNr">246 </span> 81 0/subop/add %esp 0x29c/imm32
<span id="L247" class="LineNr">247 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L248" class="LineNr">248 </span> 5f/pop-to-edi
<span id="L249" class="LineNr">249 </span> 5e/pop-to-esi
<span id="L250" class="LineNr">250 </span> 5b/pop-to-ebx
<span id="L251" class="LineNr">251 </span> 5a/pop-to-edx
<span id="L252" class="LineNr">252 </span> 59/pop-to-ecx
<span id="L253" class="LineNr">253 </span> 58/pop-to-eax
<span id="L254" class="LineNr">254 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L255" class="LineNr">255 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L256" class="LineNr">256 </span> 5d/pop-to-ebp
<span id="L257" class="LineNr">257 </span> c3/return
<span id="L258" class="LineNr">258 </span>
<span id="L259" class="LineNr">259 </span><span class="subxTest">test-subx-braces-passes-most-words-through</span>:
<span id="L260" class="LineNr">260 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L261" class="LineNr">261 </span> 55/push-ebp
<span id="L262" class="LineNr">262 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L263" class="LineNr">263 </span> <span class="subxComment"># setup</span>
<span id="L264" class="LineNr">264 </span> (clear-stream _test-input-stream)
<span id="L265" class="LineNr">265 </span> (clear-stream _test-output-stream)
<span id="L266" class="LineNr">266 </span> <span class="subxS1Comment"># . clear-stream(_test-input-buffered-file+4)</span>
<span id="L267" class="LineNr">267 </span> b8/copy-to-eax <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a>/imm32
<span id="L268" class="LineNr">268 </span> 05/add-to-eax 4/imm32
<span id="L269" class="LineNr">269 </span> (clear-stream %eax)
<span id="L270" class="LineNr">270 </span> <span class="subxS1Comment"># . clear-stream(_test-output-buffered-file+4)</span>
<span id="L271" class="LineNr">271 </span> b8/copy-to-eax <a href='../064write-byte.subx.html#L332'>_test-output-buffered-file</a>/imm32
<span id="L272" class="LineNr">272 </span> 05/add-to-eax 4/imm32
<span id="L273" class="LineNr">273 </span> (clear-stream %eax)
<span id="L274" class="LineNr">274 </span> <span class="subxComment"># test</span>
<span id="L275" class="LineNr">275 </span> (write <a href='../061read-byte.subx.html#L293'>_test-input-stream</a> <span class="Constant">&quot;== abcd 0x1&quot;</span>)
<span id="L276" class="LineNr">276 </span> (subx-braces <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a> _test-output-buffered-file)
<span id="L277" class="LineNr">277 </span> <span class="subxComment"># check that the line just passed through</span>
<span id="L278" class="LineNr">278 </span> (flush _test-output-buffered-file)
<span id="L279" class="Folded">279 </span><span class="Folded">+-- 5 lines: #? # dump _test-output-stream ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span>
<span id="L284" class="LineNr">284 </span> (check-stream-equal <a href='../064write-byte.subx.html#L290'>_test-output-stream</a> <span class="Constant">&quot;== abcd 0x1 \n&quot;</span> <span class="Constant">&quot;F - test-subx-braces-passes-most-words-through&quot;</span>)
<span id="L285" class="LineNr">285 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L286" class="LineNr">286 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L287" class="LineNr">287 </span> 5d/pop-to-ebp
<span id="L288" class="LineNr">288 </span> c3/return
<span id="L289" class="LineNr">289 </span>
<span id="L290" class="LineNr">290 </span><span class="subxTest">test-subx-braces-1</span>:
<span id="L291" class="LineNr">291 </span> <span class="subxComment"># input:</span>
<span id="L292" class="LineNr">292 </span> <span class="subxComment"># {</span>
<span id="L293" class="LineNr">293 </span> <span class="subxComment"># ab break/imm32</span>
<span id="L294" class="LineNr">294 </span> <span class="subxComment"># cd loop/imm32</span>
<span id="L295" class="LineNr">295 </span> <span class="subxComment"># }</span>
<span id="L296" class="LineNr">296 </span> <span class="subxComment">#</span>
<span id="L297" class="LineNr">297 </span> <span class="subxComment"># output:</span>
<span id="L298" class="LineNr">298 </span> <span class="subxComment"># _loop1:</span>
<span id="L299" class="LineNr">299 </span> <span class="subxComment"># ab _break1/imm32</span>
<span id="L300" class="LineNr">300 </span> <span class="subxComment"># cd _loop1/imm32</span>
<span id="L301" class="LineNr">301 </span> <span class="subxComment"># _break1:</span>
<span id="L302" class="LineNr">302 </span> <span class="subxComment">#</span>
<span id="L303" class="LineNr">303 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L304" class="LineNr">304 </span> 55/push-ebp
<span id="L305" class="LineNr">305 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L306" class="LineNr">306 </span> <span class="subxComment"># setup</span>
<span id="L307" class="LineNr">307 </span> (clear-stream _test-input-stream)
<span id="L308" class="LineNr">308 </span> (clear-stream _test-output-stream)
<span id="L309" class="LineNr">309 </span> <span class="subxS1Comment"># . clear-stream(_test-input-buffered-file+4)</span>
<span id="L310" class="LineNr">310 </span> b8/copy-to-eax <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a>/imm32
<span id="L311" class="LineNr">311 </span> 05/add-to-eax 4/imm32
<span id="L312" class="LineNr">312 </span> (clear-stream %eax)
<span id="L313" class="LineNr">313 </span> <span class="subxS1Comment"># . clear-stream(_test-output-buffered-file+4)</span>
<span id="L314" class="LineNr">314 </span> b8/copy-to-eax <a href='../064write-byte.subx.html#L332'>_test-output-buffered-file</a>/imm32
<span id="L315" class="LineNr">315 </span> 05/add-to-eax 4/imm32
<span id="L316" class="LineNr">316 </span> (clear-stream %eax)
<span id="L317" class="LineNr">317 </span> <span class="subxComment"># test</span>
<span id="L318" class="LineNr">318 </span> (write <a href='../061read-byte.subx.html#L293'>_test-input-stream</a> <span class="Constant">&quot;{\nab break/imm32\ncd loop/imm32\n}&quot;</span>)
<span id="L319" class="LineNr">319 </span> (subx-braces <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a> _test-output-buffered-file)
<span id="L320" class="LineNr">320 </span> <span class="subxComment"># check that the line just passed through</span>
<span id="L321" class="LineNr">321 </span> (flush _test-output-buffered-file)
<span id="L322" class="Folded">322 </span><span class="Folded">+-- 5 lines: #? # dump _test-output-stream ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span>
<span id="L327" class="LineNr">327 </span> (check-stream-equal <a href='../064write-byte.subx.html#L290'>_test-output-stream</a> <span class="Constant">&quot;_loop0x00000001:\nab _break0x00000001/imm32 \ncd _loop0x00000001/imm32 \n_break0x00000001:\n&quot;</span> <span class="Constant">&quot;F - test-subx-braces-1&quot;</span>)
<span id="L328" class="LineNr">328 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L329" class="LineNr">329 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L330" class="LineNr">330 </span> 5d/pop-to-ebp
<span id="L331" class="LineNr">331 </span> c3/return
<span id="L332" class="LineNr">332 </span>
<span id="L333" class="LineNr">333 </span><span class="subxTest">test-subx-braces-2</span>:
<span id="L334" class="LineNr">334 </span> <span class="subxComment"># input:</span>
<span id="L335" class="LineNr">335 </span> <span class="subxComment"># {</span>
<span id="L336" class="LineNr">336 </span> <span class="subxComment"># {</span>
<span id="L337" class="LineNr">337 </span> <span class="subxComment"># ab break/imm32</span>
<span id="L338" class="LineNr">338 </span> <span class="subxComment"># }</span>
<span id="L339" class="LineNr">339 </span> <span class="subxComment"># cd loop/imm32</span>
<span id="L340" class="LineNr">340 </span> <span class="subxComment"># }</span>
<span id="L341" class="LineNr">341 </span> <span class="subxComment">#</span>
<span id="L342" class="LineNr">342 </span> <span class="subxComment"># output:</span>
<span id="L343" class="LineNr">343 </span> <span class="subxComment"># _loop1:</span>
<span id="L344" class="LineNr">344 </span> <span class="subxComment"># _loop2:</span>
<span id="L345" class="LineNr">345 </span> <span class="subxComment"># ab _break2/imm32</span>
<span id="L346" class="LineNr">346 </span> <span class="subxComment"># _break2:</span>
<span id="L347" class="LineNr">347 </span> <span class="subxComment"># cd _loop1/imm32</span>
<span id="L348" class="LineNr">348 </span> <span class="subxComment"># _break1:</span>
<span id="L349" class="LineNr">349 </span> <span class="subxComment">#</span>
<span id="L350" class="LineNr">350 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L351" class="LineNr">351 </span> 55/push-ebp
<span id="L352" class="LineNr">352 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L353" class="LineNr">353 </span> <span class="subxComment"># setup</span>
<span id="L354" class="LineNr">354 </span> (clear-stream _test-input-stream)
<span id="L355" class="LineNr">355 </span> (clear-stream _test-output-stream)
<span id="L356" class="LineNr">356 </span> <span class="subxS1Comment"># . clear-stream(_test-input-buffered-file+4)</span>
<span id="L357" class="LineNr">357 </span> b8/copy-to-eax <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a>/imm32
<span id="L358" class="LineNr">358 </span> 05/add-to-eax 4/imm32
<span id="L359" class="LineNr">359 </span> (clear-stream %eax)
<span id="L360" class="LineNr">360 </span> <span class="subxS1Comment"># . clear-stream(_test-output-buffered-file+4)</span>
<span id="L361" class="LineNr">361 </span> b8/copy-to-eax <a href='../064write-byte.subx.html#L332'>_test-output-buffered-file</a>/imm32
<span id="L362" class="LineNr">362 </span> 05/add-to-eax 4/imm32
<span id="L363" class="LineNr">363 </span> (clear-stream %eax)
<span id="L364" class="LineNr">364 </span> <span class="subxComment"># test</span>
<span id="L365" class="LineNr">365 </span> (write <a href='../061read-byte.subx.html#L293'>_test-input-stream</a> <span class="Constant">&quot;{\n{\nab break/imm32\n}\ncd loop/imm32\n}&quot;</span>)
<span id="L366" class="LineNr">366 </span> (subx-braces <a href='../061read-byte.subx.html#L319'>_test-input-buffered-file</a> _test-output-buffered-file)
<span id="L367" class="LineNr">367 </span> <span class="subxComment"># check that the line just passed through</span>
<span id="L368" class="LineNr">368 </span> (flush _test-output-buffered-file)
<span id="L369" class="Folded">369 </span><span class="Folded">+-- 5 lines: #? # dump _test-output-stream ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span>
<span id="L374" class="LineNr">374 </span> (check-stream-equal <a href='../064write-byte.subx.html#L290'>_test-output-stream</a> <span class="Constant">&quot;_loop0x00000001:\n_loop0x00000002:\nab _break0x00000002/imm32 \n_break0x00000002:\ncd _loop0x00000001/imm32 \n_break0x00000001:\n&quot;</span> <span class="Constant">&quot;F - test-subx-braces-2&quot;</span>)
<span id="L375" class="LineNr">375 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L376" class="LineNr">376 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L377" class="LineNr">377 </span> 5d/pop-to-ebp
<span id="L378" class="LineNr">378 </span> c3/return
<span id="L379" class="LineNr">379 </span>
<span id="L380" class="LineNr">380 </span><span class="subxComment"># let's just put stack primitives here for now</span>
<span id="L381" class="LineNr">381 </span><span class="subxComment"># we need to think about how to maintain layers of the library at different levels of syntax sugar</span>
<span id="L382" class="LineNr">382 </span>
<span id="L383" class="LineNr">383 </span><span class="subxComment"># A stack looks like this:</span>
<span id="L384" class="LineNr">384 </span><span class="subxComment"># top: int</span>
<span id="L385" class="LineNr">385 </span><span class="subxComment"># data: (array byte) # prefixed by length as usual</span>
<span id="L386" class="LineNr">386 </span>
<span id="L387" class="LineNr">387 </span><span class="subxFunction">clear-stack</span>: <span class="subxComment"># s : (address stack)</span>
<span id="L388" class="LineNr">388 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L389" class="LineNr">389 </span> 55/push-ebp
<span id="L390" class="LineNr">390 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L391" class="LineNr">391 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L392" class="LineNr">392 </span> 50/push-eax
<span id="L393" class="LineNr">393 </span> 51/push-ecx
<span id="L394" class="LineNr">394 </span> <span class="subxComment"># eax = s</span>
<span id="L395" class="LineNr">395 </span> 8b/-&gt; *(ebp+8) 0/r32/eax
<span id="L396" class="LineNr">396 </span> <span class="subxComment"># ecx = s-&gt;length</span>
<span id="L397" class="LineNr">397 </span> 8b/-&gt; *(eax+4) 1/r32/ecx
<span id="L398" class="LineNr">398 </span> <span class="subxComment"># ecx = &amp;s-&gt;data[s-&gt;length]</span>
<span id="L399" class="LineNr">399 </span> 8d/copy-address *(eax+ecx+8) 1/r32/ecx
<span id="L400" class="LineNr">400 </span> <span class="subxComment"># s-&gt;top = 0</span>
<span id="L401" class="LineNr">401 </span> c7/copy 0/subop/copy *eax 0/imm32
<span id="L402" class="LineNr">402 </span> <span class="subxComment"># eax = s-&gt;data</span>
<span id="L403" class="LineNr">403 </span> 81 0/subop/add %eax 8/imm32
<span id="L404" class="LineNr">404 </span><span class="Constant">$clear-stack:loop</span>:
<span id="L405" class="LineNr">405 </span> <span class="subxComment"># if (eax &gt;= ecx) break</span>
<span id="L406" class="LineNr">406 </span> 39/compare %eax 1/r32/ecx
<span id="L407" class="LineNr">407 </span> 73/jump-if-greater-or-equal-unsigned $clear-stack:end/disp8
<span id="L408" class="LineNr">408 </span> <span class="subxComment"># *eax = 0</span>
<span id="L409" class="LineNr">409 </span> c6 0/subop/copy-byte *eax 0/imm8
<span id="L410" class="LineNr">410 </span> <span class="subxComment"># ++eax</span>
<span id="L411" class="LineNr">411 </span> 40/increment-eax
<span id="L412" class="LineNr">412 </span> eb/jump $clear-stack:<span class="Constant">loop</span>/disp8
<span id="L413" class="LineNr">413 </span><span class="Constant">$clear-stack:end</span>:
<span id="L414" class="LineNr">414 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L415" class="LineNr">415 </span> 59/pop-to-ecx
<span id="L416" class="LineNr">416 </span> 58/pop-to-eax
<span id="L417" class="LineNr">417 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L418" class="LineNr">418 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L419" class="LineNr">419 </span> 5d/pop-to-ebp
<span id="L420" class="LineNr">420 </span> c3/return
<span id="L421" class="LineNr">421 </span>
<span id="L422" class="LineNr">422 </span><span class="subxTest">test-clear-stack</span>:
<span id="L423" class="LineNr">423 </span> <span class="subxComment"># var ecx : (address stack) = stack of size 8 with random data in it</span>
<span id="L424" class="LineNr">424 </span> 68/push 34/imm32
<span id="L425" class="LineNr">425 </span> 68/push 35/imm32
<span id="L426" class="LineNr">426 </span> 68/push 8/imm32/length
<span id="L427" class="LineNr">427 </span> 68/push 14/imm32/top
<span id="L428" class="LineNr">428 </span> 89/&lt;- %ecx 4/r32/esp
<span id="L429" class="LineNr">429 </span> <span class="subxComment"># clear</span>
<span id="L430" class="LineNr">430 </span> (clear-stack %ecx)
<span id="L431" class="LineNr">431 </span> <span class="subxComment"># top should be 0</span>
<span id="L432" class="LineNr">432 </span> 58/pop-to-eax
<span id="L433" class="LineNr">433 </span> (check-ints-equal %eax 0 <span class="Constant">&quot;F - <a href='braces.subx.html#L422'>test-clear-stack</a>: top&quot;</span>)
<span id="L434" class="LineNr">434 </span> <span class="subxComment"># length should remain 8</span>
<span id="L435" class="LineNr">435 </span> 58/pop-to-eax
<span id="L436" class="LineNr">436 </span> (check-ints-equal %eax 8 <span class="Constant">&quot;F - <a href='braces.subx.html#L422'>test-clear-stack</a>: length&quot;</span>)
<span id="L437" class="LineNr">437 </span> <span class="subxComment"># first word is 0</span>
<span id="L438" class="LineNr">438 </span> 58/pop-to-eax
<span id="L439" class="LineNr">439 </span> (check-ints-equal %eax 0 <span class="Constant">&quot;F - <a href='braces.subx.html#L422'>test-clear-stack</a>: data[0..3]&quot;</span>)
<span id="L440" class="LineNr">440 </span> <span class="subxComment"># second word is 0</span>
<span id="L441" class="LineNr">441 </span> 58/pop-to-eax
<span id="L442" class="LineNr">442 </span> (check-ints-equal %eax 0 <span class="Constant">&quot;F - <a href='braces.subx.html#L422'>test-clear-stack</a>: data[4..7]&quot;</span>)
<span id="L443" class="LineNr">443 </span> c3/return
<span id="L444" class="LineNr">444 </span>
<span id="L445" class="LineNr">445 </span><span class="subxFunction">push</span>: <span class="subxComment"># s : (address stack), n : int</span>
<span id="L446" class="LineNr">446 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L447" class="LineNr">447 </span> 55/push-ebp
<span id="L448" class="LineNr">448 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L449" class="LineNr">449 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L450" class="LineNr">450 </span> 50/push-eax
<span id="L451" class="LineNr">451 </span> 51/push-ecx
<span id="L452" class="LineNr">452 </span> 56/push-esi
<span id="L453" class="LineNr">453 </span> <span class="subxComment"># esi = s</span>
<span id="L454" class="LineNr">454 </span> 8b/-&gt; *(ebp+8) 6/r32/esi
<span id="L455" class="LineNr">455 </span> <span class="subxComment"># ecx = s-&gt;top</span>
<span id="L456" class="LineNr">456 </span> 8b/-&gt; *esi 1/r32/ecx
<span id="L457" class="LineNr">457 </span> <span class="subxComment"># if (s-&gt;top &gt;= s-&gt;length) abort</span>
<span id="L458" class="LineNr">458 </span> 39/compare *(esi+4) 1/r32/ecx
<span id="L459" class="LineNr">459 </span> 7e/jump-if-lesser-or-equal $push:abort/disp8
<span id="L460" class="LineNr">460 </span> <span class="subxComment"># s-&gt;data[s-&gt;top] = n</span>
<span id="L461" class="LineNr">461 </span> 8b/-&gt; *(ebp+0xc) 0/r32/eax
<span id="L462" class="LineNr">462 </span> 89/&lt;- *(esi+ecx+8) 0/r32/eax
<span id="L463" class="LineNr">463 </span> <span class="subxComment"># s-&gt;top += 4</span>
<span id="L464" class="LineNr">464 </span> 81 0/subop/add *esi 4/imm32
<span id="L465" class="LineNr">465 </span><span class="Constant">$push:end</span>:
<span id="L466" class="LineNr">466 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L467" class="LineNr">467 </span> 5e/pop-to-esi
<span id="L468" class="LineNr">468 </span> 59/pop-to-ecx
<span id="L469" class="LineNr">469 </span> 58/pop-to-eax
<span id="L470" class="LineNr">470 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L471" class="LineNr">471 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L472" class="LineNr">472 </span> 5d/pop-to-ebp
<span id="L473" class="LineNr">473 </span> c3/return
<span id="L474" class="LineNr">474 </span>
<span id="L475" class="LineNr">475 </span><span class="Constant">$push:abort</span>:
<span id="L476" class="LineNr">476 </span> <span class="subxComment"># print(stderr, &quot;error: push: no space left&quot;)</span>
<span id="L477" class="LineNr">477 </span> <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: push: no space left&quot;)</span>
<span id="L478" class="LineNr">478 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L479" class="LineNr">479 </span> 68/push <span class="Constant">&quot;error: <a href='braces.subx.html#L445'>push</a>: no space left&quot;</span>/imm32
<span id="L480" class="LineNr">480 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L481" class="LineNr">481 </span> <span class="subxS2Comment"># . . call</span>
<span id="L482" class="LineNr">482 </span> e8/call <a href='../065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L483" class="LineNr">483 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L484" class="LineNr">484 </span> 81 0/subop/add %esp 8/imm32
<span id="L485" class="LineNr">485 </span> <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L486" class="LineNr">486 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L487" class="LineNr">487 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L488" class="LineNr">488 </span> <span class="subxS2Comment"># . . call</span>
<span id="L489" class="LineNr">489 </span> e8/call <a href='../064write-byte.subx.html#L79'>flush</a>/disp32
<span id="L490" class="LineNr">490 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L491" class="LineNr">491 </span> 81 0/subop/add %esp 4/imm32
<span id="L492" class="LineNr">492 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L493" class="LineNr">493 </span> bb/copy-to-ebx 1/imm32
<span id="L494" class="LineNr">494 </span> b8/copy-to-eax 1/imm32/exit
<span id="L495" class="LineNr">495 </span> cd/syscall 0x80/imm8
<span id="L496" class="LineNr">496 </span> <span class="subxComment"># never gets here</span>
<span id="L497" class="LineNr">497 </span>
<span id="L498" class="LineNr">498 </span><span class="subxTest">test-push</span>:
<span id="L499" class="LineNr">499 </span> <span class="subxComment"># var ecx : (address stack) = empty stack of size 8</span>
<span id="L500" class="LineNr">500 </span> 68/push 0/imm32
<span id="L501" class="LineNr">501 </span> 68/push 0/imm32
<span id="L502" class="LineNr">502 </span> 68/push 8/imm32/length
<span id="L503" class="LineNr">503 </span> 68/push 0/imm32/top
<span id="L504" class="LineNr">504 </span> 89/&lt;- %ecx 4/r32/esp
<span id="L505" class="LineNr">505 </span> <span class="subxComment">#</span>
<span id="L506" class="LineNr">506 </span> (push %ecx 42)
<span id="L507" class="LineNr">507 </span> <span class="subxComment"># top</span>
<span id="L508" class="LineNr">508 </span> 58/pop-to-eax
<span id="L509" class="LineNr">509 </span> (check-ints-equal %eax 4 <span class="Constant">&quot;F - <a href='braces.subx.html#L498'>test-push</a>: top&quot;</span>)
<span id="L510" class="LineNr">510 </span> <span class="subxComment"># length</span>
<span id="L511" class="LineNr">511 </span> 58/pop-to-eax
<span id="L512" class="LineNr">512 </span> (check-ints-equal %eax 8 <span class="Constant">&quot;F - <a href='braces.subx.html#L498'>test-push</a>: length&quot;</span>)
<span id="L513" class="LineNr">513 </span> <span class="subxComment"># first word is 42</span>
<span id="L514" class="LineNr">514 </span> 58/pop-to-eax
<span id="L515" class="LineNr">515 </span> (check-ints-equal %eax 42 <span class="Constant">&quot;F - <a href='braces.subx.html#L498'>test-push</a>: data[0..3]&quot;</span>)
<span id="L516" class="LineNr">516 </span> <span class="subxComment"># second word is 0</span>
<span id="L517" class="LineNr">517 </span> 58/pop-to-eax
<span id="L518" class="LineNr">518 </span> (check-ints-equal %eax 0 <span class="Constant">&quot;F - <a href='braces.subx.html#L498'>test-push</a>: data[4..7]&quot;</span>)
<span id="L519" class="LineNr">519 </span> c3/return
<span id="L520" class="LineNr">520 </span>
<span id="L521" class="LineNr">521 </span><span class="subxFunction">pop</span>: <span class="subxComment"># s : (address stack) -&gt; n/eax : int</span>
<span id="L522" class="LineNr">522 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L523" class="LineNr">523 </span> 55/push-ebp
<span id="L524" class="LineNr">524 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L525" class="LineNr">525 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L526" class="LineNr">526 </span> 51/push-ecx
<span id="L527" class="LineNr">527 </span> 56/push-esi
<span id="L528" class="LineNr">528 </span> <span class="subxComment"># esi = s</span>
<span id="L529" class="LineNr">529 </span> 8b/-&gt; *(ebp+8) 6/r32/esi
<span id="L530" class="LineNr">530 </span> <span class="subxComment"># if (s-&gt;top &lt;= 0) abort</span>
<span id="L531" class="LineNr">531 </span> 81 7/subop/compare *esi 0/imm32
<span id="L532" class="LineNr">532 </span> 7e/jump-if-lesser-or-equal $pop:abort/disp8
<span id="L533" class="LineNr">533 </span> <span class="subxComment"># s-&gt;top -= 4</span>
<span id="L534" class="LineNr">534 </span> 81 5/subop/subtract *esi 4/imm32
<span id="L535" class="LineNr">535 </span> <span class="subxComment"># eax = s-&gt;data[s-&gt;top]</span>
<span id="L536" class="LineNr">536 </span> 8b/-&gt; *esi 1/r32/ecx/top
<span id="L537" class="LineNr">537 </span> 8b/-&gt; *(esi+ecx+8) 0/r32/eax
<span id="L538" class="LineNr">538 </span><span class="Constant">$pop:end</span>:
<span id="L539" class="LineNr">539 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L540" class="LineNr">540 </span> 5e/pop-to-esi
<span id="L541" class="LineNr">541 </span> 59/pop-to-ecx
<span id="L542" class="LineNr">542 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L543" class="LineNr">543 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L544" class="LineNr">544 </span> 5d/pop-to-ebp
<span id="L545" class="LineNr">545 </span> c3/return
<span id="L546" class="LineNr">546 </span>
<span id="L547" class="LineNr">547 </span><span class="Constant">$pop:abort</span>:
<span id="L548" class="LineNr">548 </span> <span class="subxComment"># print(stderr, &quot;error: pop: nothing left in stack&quot;)</span>
<span id="L549" class="LineNr">549 </span> <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: pop: nothing left in stack&quot;)</span>
<span id="L550" class="LineNr">550 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L551" class="LineNr">551 </span> 68/push <span class="Constant">&quot;error: <a href='braces.subx.html#L521'>pop</a>: nothing left in stack&quot;</span>/imm32
<span id="L552" class="LineNr">552 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L553" class="LineNr">553 </span> <span class="subxS2Comment"># . . call</span>
<span id="L554" class="LineNr">554 </span> e8/call <a href='../065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L555" class="LineNr">555 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L556" class="LineNr">556 </span> 81 0/subop/add %esp 8/imm32
<span id="L557" class="LineNr">557 </span> <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L558" class="LineNr">558 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L559" class="LineNr">559 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L560" class="LineNr">560 </span> <span class="subxS2Comment"># . . call</span>
<span id="L561" class="LineNr">561 </span> e8/call <a href='../064write-byte.subx.html#L79'>flush</a>/disp32
<span id="L562" class="LineNr">562 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L563" class="LineNr">563 </span> 81 0/subop/add %esp 4/imm32
<span id="L564" class="LineNr">564 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L565" class="LineNr">565 </span> bb/copy-to-ebx 1/imm32
<span id="L566" class="LineNr">566 </span> b8/copy-to-eax 1/imm32/exit
<span id="L567" class="LineNr">567 </span> cd/syscall 0x80/imm8
<span id="L568" class="LineNr">568 </span> <span class="subxComment"># never gets here</span>
<span id="L569" class="LineNr">569 </span>
<span id="L570" class="LineNr">570 </span><span class="subxTest">test-pop</span>:
<span id="L571" class="LineNr">571 </span> <span class="subxComment"># var ecx : (address stack) = stack of size 8 containing just 42</span>
<span id="L572" class="LineNr">572 </span> 68/push 0/imm32
<span id="L573" class="LineNr">573 </span> 68/push 42/imm32
<span id="L574" class="LineNr">574 </span> 68/push 8/imm32/length
<span id="L575" class="LineNr">575 </span> 68/push 4/imm32/top
<span id="L576" class="LineNr">576 </span> 89/&lt;- %ecx 4/r32/esp
<span id="L577" class="LineNr">577 </span> <span class="subxComment">#</span>
<span id="L578" class="LineNr">578 </span> (pop %ecx) <span class="subxComment"># =&gt; eax</span>
<span id="L579" class="LineNr">579 </span> <span class="subxComment"># result</span>
<span id="L580" class="LineNr">580 </span> (check-ints-equal %eax 42 <span class="Constant">&quot;F - <a href='braces.subx.html#L570'>test-pop</a>: result&quot;</span>)
<span id="L581" class="LineNr">581 </span> <span class="subxComment"># top</span>
<span id="L582" class="LineNr">582 </span> 58/pop-to-eax
<span id="L583" class="LineNr">583 </span> (check-ints-equal %eax 0 <span class="Constant">&quot;F - <a href='braces.subx.html#L570'>test-pop</a>: top&quot;</span>)
<span id="L584" class="LineNr">584 </span> <span class="subxComment"># length</span>
<span id="L585" class="LineNr">585 </span> 58/pop-to-eax
<span id="L586" class="LineNr">586 </span> (check-ints-equal %eax 8 <span class="Constant">&quot;F - <a href='braces.subx.html#L570'>test-pop</a>: length&quot;</span>)
<span id="L587" class="LineNr">587 </span> <span class="subxComment"># clean up</span>
<span id="L588" class="LineNr">588 </span> 81 0/subop/add %esp 8/imm32
<span id="L589" class="LineNr">589 </span> c3/return
<span id="L590" class="LineNr">590 </span>
<span id="L591" class="LineNr">591 </span><span class="subxFunction">top</span>: <span class="subxComment"># s : (address stack) -&gt; n/eax : int</span>
<span id="L592" class="LineNr">592 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L593" class="LineNr">593 </span> 55/push-ebp
<span id="L594" class="LineNr">594 </span> 89/&lt;- %ebp 4/r32/esp
<span id="L595" class="LineNr">595 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L596" class="LineNr">596 </span> 51/push-ecx
<span id="L597" class="LineNr">597 </span> 56/push-esi
<span id="L598" class="LineNr">598 </span> <span class="subxComment"># esi = s</span>
<span id="L599" class="LineNr">599 </span> 8b/-&gt; *(ebp+8) 6/r32/esi
<span id="L600" class="LineNr">600 </span> <span class="subxComment"># if (s-&gt;top &lt;= 0) abort</span>
<span id="L601" class="LineNr">601 </span> 81 7/subop/compare *esi 0/imm32
<span id="L602" class="LineNr">602 </span> 7e/jump-if-lesser-or-equal $top:abort/disp8
<span id="L603" class="LineNr">603 </span> <span class="subxComment"># eax = s-&gt;data[s-&gt;top - 4]</span>
<span id="L604" class="LineNr">604 </span> 8b/-&gt; *esi 1/r32/ecx/top
<span id="L605" class="LineNr">605 </span> 81 5/subop/subtract %ecx 4/imm32
<span id="L606" class="LineNr">606 </span> 8b/-&gt; *(esi+ecx+8) 0/r32/eax
<span id="L607" class="LineNr">607 </span><span class="Constant">$top:end</span>:
<span id="L608" class="LineNr">608 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L609" class="LineNr">609 </span> 5e/pop-to-esi
<span id="L610" class="LineNr">610 </span> 59/pop-to-ecx
<span id="L611" class="LineNr">611 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L612" class="LineNr">612 </span> 89/&lt;- %esp 5/r32/ebp
<span id="L613" class="LineNr">613 </span> 5d/pop-to-ebp
<span id="L614" class="LineNr">614 </span> c3/return
<span id="L615" class="LineNr">615 </span>
<span id="L616" class="LineNr">616 </span><span class="Constant">$top:abort</span>:
<span id="L617" class="LineNr">617 </span> <span class="subxComment"># print(stderr, &quot;error: top: nothing left in stack&quot;)</span>
<span id="L618" class="LineNr">618 </span> <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: top: nothing left in stack&quot;)</span>
<span id="L619" class="LineNr">619 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L620" class="LineNr">620 </span> 68/push <span class="Constant">&quot;error: <a href='braces.subx.html#L591'>top</a>: nothing left in stack&quot;</span>/imm32
<span id="L621" class="LineNr">621 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L622" class="LineNr">622 </span> <span class="subxS2Comment"># . . call</span>
<span id="L623" class="LineNr">623 </span> e8/call <a href='../065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L624" class="LineNr">624 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L625" class="LineNr">625 </span> 81 0/subop/add %esp 8/imm32
<span id="L626" class="LineNr">626 </span> <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L627" class="LineNr">627 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L628" class="LineNr">628 </span> 68/push <span class="SpecialChar"><a href='../065write-buffered.subx.html#L213'>Stderr</a></span>/imm32
<span id="L629" class="LineNr">629 </span> <span class="subxS2Comment"># . . call</span>
<span id="L630" class="LineNr">630 </span> e8/call <a href='../064write-byte.subx.html#L79'>flush</a>/disp32
<span id="L631" class="LineNr">631 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L632" class="LineNr">632 </span> 81 0/subop/add %esp 4/imm32
<span id="L633" class="LineNr">633 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L634" class="LineNr">634 </span> bb/copy-to-ebx 1/imm32
<span id="L635" class="LineNr">635 </span> b8/copy-to-eax 1/imm32/exit
<span id="L636" class="LineNr">636 </span> cd/syscall 0x80/imm8
<span id="L637" class="LineNr">637 </span> <span class="subxComment"># never gets here</span>
<span id="L638" class="LineNr">638 </span>
<span id="L639" class="LineNr">639 </span><span class="subxTest">test-top</span>:
<span id="L640" class="LineNr">640 </span> <span class="subxComment"># var ecx : (address stack) = stack of size 8 containing just 42</span>
<span id="L641" class="LineNr">641 </span> 68/push 0/imm32
<span id="L642" class="LineNr">642 </span> 68/push 42/imm32
<span id="L643" class="LineNr">643 </span> 68/push 8/imm32/length
<span id="L644" class="LineNr">644 </span> 68/push 4/imm32/top
<span id="L645" class="LineNr">645 </span> 89/&lt;- %ecx 4/r32/esp
<span id="L646" class="LineNr">646 </span> <span class="subxComment">#</span>
<span id="L647" class="LineNr">647 </span> (top %ecx) <span class="subxComment"># =&gt; eax</span>
<span id="L648" class="LineNr">648 </span> <span class="subxComment"># result</span>
<span id="L649" class="LineNr">649 </span> (check-ints-equal %eax 42 <span class="Constant">&quot;F - <a href='braces.subx.html#L639'>test-top</a>: result&quot;</span>)
<span id="L650" class="LineNr">650 </span> <span class="subxComment"># clean up</span>
<span id="L651" class="LineNr">651 </span> 81 0/subop/add %esp 0x10/imm32
<span id="L652" class="LineNr">652 </span> c3/return
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->