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<a href='https://github.com/akkartik/mu/blob/main/apps/rpn.mu'>https://github.com/akkartik/mu/blob/main/apps/rpn.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Integer arithmetic using postfix notation</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># Limitations:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># Division not implemented yet.</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment">#</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># To build:</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># $ ./translate apps/rpn.mu</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment">#</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># Example session:</span>
<span id="L10" class="LineNr"> 10 </span><span class="muComment"># $ qemu-system-i386 code.img</span>
<span id="L11" class="LineNr"> 11 </span><span class="muComment"># > 4</span>
<span id="L12" class="LineNr"> 12 </span><span class="muComment"># 4</span>
<span id="L13" class="LineNr"> 13 </span><span class="muComment"># > 5 3 -</span>
<span id="L14" class="LineNr"> 14 </span><span class="muComment"># 2</span>
<span id="L15" class="LineNr"> 15 </span><span class="muComment">#</span>
<span id="L16" class="LineNr"> 16 </span><span class="muComment"># Error handling is non-existent. This is just a prototype.</span>
<span id="L17" class="LineNr"> 17 </span>
<span id="L18" class="LineNr"> 18 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L18'>main</a></span> <a href='../500fake-screen.mu.html#L14'>screen</a>: (addr <a href='../500fake-screen.mu.html#L14'>screen</a>), keyboard: (addr keyboard), data-disk: (addr disk) <span class="Delimiter">{</span>
<span id="L19" class="LineNr"> 19 </span> <span class="PreProc">var</span> in-storage: (stream byte <span class="Constant">0x80</span>)
<span id="L20" class="LineNr"> 20 </span> <span class="PreProc">var</span> in/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address in-storage
<span id="L21" class="LineNr"> 21 </span> <span class="PreProc">var</span> y/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L22" class="LineNr"> 22 </span> <span class="PreProc">var</span> space/<span class="muRegEdx">edx</span>: grapheme <span class="Special"><-</span> copy <span class="Constant">0x20</span>
<span id="L23" class="LineNr"> 23 </span> <span class="muComment"># read-eval-print loop</span>
<span id="L24" class="LineNr"> 24 </span> <span class="Delimiter">{</span>
<span id="L25" class="LineNr"> 25 </span> <span class="muComment"># print prompt</span>
<span id="L26" class="LineNr"> 26 </span> <span class="PreProc">var</span> x/eax: int <span class="Special"><-</span> <a href='../501draw-text.mu.html#L100'>draw-text-rightward</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, <span class="Constant">"> "</span>, <span class="Constant">0</span>/x, <span class="Constant">0x80</span>/xmax, y, <span class="Constant">3</span>/fg/cyan, <span class="Constant">0</span>/bg
<span id="L27" class="LineNr"> 27 </span> <span class="muComment"># read line from keyboard</span>
<span id="L28" class="LineNr"> 28 </span> <a href='../106stream.subx.html#L20'>clear-stream</a> in
<span id="L29" class="LineNr"> 29 </span> <span class="Delimiter">{</span>
<span id="L30" class="LineNr"> 30 </span> <a href='../500fake-screen.mu.html#L237'>draw-cursor</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, space
<span id="L31" class="LineNr"> 31 </span> <span class="PreProc">var</span> key/eax: byte <span class="Special"><-</span> <a href='../102keyboard.subx.html#L21'>read-key</a> keyboard
<span id="L32" class="LineNr"> 32 </span> compare key, <span class="Constant">0xa</span>/newline
<span id="L33" class="LineNr"> 33 </span> <span class="PreProc">break-if-=</span>
<span id="L34" class="LineNr"> 34 </span> compare key, <span class="Constant">0</span>
<span id="L35" class="LineNr"> 35 </span> <span class="PreProc">loop-if-=</span>
<span id="L36" class="LineNr"> 36 </span> <span class="PreProc">var</span> key2/eax: int <span class="Special"><-</span> copy key
<span id="L37" class="LineNr"> 37 </span> <a href='../115write-byte.subx.html#L12'>append-byte</a> in, key2
<span id="L38" class="LineNr"> 38 </span> <span class="PreProc">var</span> g/eax: grapheme <span class="Special"><-</span> copy key2
<span id="L39" class="LineNr"> 39 </span> <a href='../501draw-text.mu.html#L84'>draw-grapheme-at-cursor</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, g, <span class="Constant">0xf</span>/fg, <span class="Constant">0</span>/bg
<span id="L40" class="LineNr"> 40 </span> <a href='../501draw-text.mu.html#L16'>move-cursor-right</a> <span class="Constant">0</span>
<span id="L41" class="LineNr"> 41 </span> <span class="PreProc">loop</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Delimiter">}</span>
<span id="L43" class="LineNr"> 43 </span> <span class="muComment"># clear cursor</span>
<span id="L44" class="LineNr"> 44 </span> <a href='../501draw-text.mu.html#L84'>draw-grapheme-at-cursor</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, space, <span class="Constant">3</span>/fg/never-used, <span class="Constant">0</span>/bg
<span id="L45" class="LineNr"> 45 </span> <span class="muComment"># parse and eval</span>
<span id="L46" class="LineNr"> 46 </span> <span class="PreProc">var</span> out/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L62'>simplify</a> in
<span id="L47" class="LineNr"> 47 </span> <span class="muComment"># print</span>
<span id="L48" class="LineNr"> 48 </span> y <span class="Special"><-</span> increment
<span id="L49" class="LineNr"> 49 </span> out, y <span class="Special"><-</span> <a href='../501draw-text.mu.html#L340'>draw-int32-decimal-wrapping-right-then-down</a> <a href='../500fake-screen.mu.html#L14'>screen</a>, out, <span class="Constant">0</span>/xmin, y, <span class="Constant">0x80</span>/xmax, <span class="Constant">0x30</span>/ymax, <span class="Constant">0</span>/x, y, <span class="Constant">7</span>/fg, <span class="Constant">0</span>/bg
<span id="L50" class="LineNr"> 50 </span> <span class="muComment"># newline</span>
<span id="L51" class="LineNr"> 51 </span> y <span class="Special"><-</span> increment
<span id="L52" class="LineNr"> 52 </span> <span class="muComment">#</span>
<span id="L53" class="LineNr"> 53 </span> <span class="PreProc">loop</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Delimiter">}</span>
<span id="L55" class="LineNr"> 55 </span><span class="Delimiter">}</span>
<span id="L56" class="LineNr"> 56 </span>
<span id="L57" class="LineNr"> 57 </span><span class="PreProc">type</span> <a href='rpn.mu.html#L57'>int-stack</a> <span class="Delimiter">{</span>
<span id="L58" class="LineNr"> 58 </span> data: (handle array int)
<span id="L59" class="LineNr"> 59 </span> top: int
<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">}</span>
<span id="L61" class="LineNr"> 61 </span>
<span id="L62" class="LineNr"> 62 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L62'>simplify</a></span> in: (addr stream byte)<span class="PreProc"> -> </span>_/eax: int <span class="Delimiter">{</span>
<span id="L63" class="LineNr"> 63 </span> <span class="PreProc">var</span> word-storage: slice
<span id="L64" class="LineNr"> 64 </span> <span class="PreProc">var</span> word/<span class="muRegEcx">ecx</span>: (addr slice) <span class="Special"><-</span> address word-storage
<span id="L65" class="LineNr"> 65 </span> <span class="PreProc">var</span> stack-storage: <a href='rpn.mu.html#L57'>int-stack</a>
<span id="L66" class="LineNr"> 66 </span> <span class="PreProc">var</span> stack/<span class="muRegEsi">esi</span>: (addr <a href='rpn.mu.html#L57'>int-stack</a>) <span class="Special"><-</span> address stack-storage
<span id="L67" class="LineNr"> 67 </span> <a href='rpn.mu.html#L116'>initialize-int-stack</a> stack, <span class="Constant">0x10</span>
<span id="L68" class="LineNr"> 68 </span> $simplify:word-loop: <span class="Delimiter">{</span>
<span id="L69" class="LineNr"> 69 </span> <a href='../127next-word.subx.html#L11'>next-word</a> in, word
<span id="L70" class="LineNr"> 70 </span> <span class="PreProc">var</span> done?/eax: boolean <span class="Special"><-</span> <a href='../123slice.subx.html#L9'>slice-empty?</a> word
<span id="L71" class="LineNr"> 71 </span> compare done?, <span class="Constant">0</span>
<span id="L72" class="LineNr"> 72 </span> <span class="PreProc">break-if-!=</span>
<span id="L73" class="LineNr"> 73 </span> <span class="muComment"># if word is an operator, perform it</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Delimiter">{</span>
<span id="L75" class="LineNr"> 75 </span> <span class="PreProc">var</span> is-add?/eax: boolean <span class="Special"><-</span> <a href='../123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"+"</span>
<span id="L76" class="LineNr"> 76 </span> compare is-add?, <span class="Constant">0</span>
<span id="L77" class="LineNr"> 77 </span> <span class="PreProc">break-if-=</span>
<span id="L78" class="LineNr"> 78 </span> <span class="PreProc">var</span> _b/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L79" class="LineNr"> 79 </span> <span class="PreProc">var</span> b/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy _b
<span id="L80" class="LineNr"> 80 </span> <span class="PreProc">var</span> a/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L81" class="LineNr"> 81 </span> a <span class="Special"><-</span> add b
<span id="L82" class="LineNr"> 82 </span> <a href='rpn.mu.html#L124'>push-int-stack</a> stack, a
<span id="L83" class="LineNr"> 83 </span> <span class="PreProc">loop</span> $simplify:word-loop
<span id="L84" class="LineNr"> 84 </span> <span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Delimiter">{</span>
<span id="L86" class="LineNr"> 86 </span> <span class="PreProc">var</span> is-sub?/eax: boolean <span class="Special"><-</span> <a href='../123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"-"</span>
<span id="L87" class="LineNr"> 87 </span> compare is-sub?, <span class="Constant">0</span>
<span id="L88" class="LineNr"> 88 </span> <span class="PreProc">break-if-=</span>
<span id="L89" class="LineNr"> 89 </span> <span class="PreProc">var</span> _b/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L90" class="LineNr"> 90 </span> <span class="PreProc">var</span> b/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy _b
<span id="L91" class="LineNr"> 91 </span> <span class="PreProc">var</span> a/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L92" class="LineNr"> 92 </span> a <span class="Special"><-</span> subtract b
<span id="L93" class="LineNr"> 93 </span> <a href='rpn.mu.html#L124'>push-int-stack</a> stack, a
<span id="L94" class="LineNr"> 94 </span> <span class="PreProc">loop</span> $simplify:word-loop
<span id="L95" class="LineNr"> 95 </span> <span class="Delimiter">}</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Delimiter">{</span>
<span id="L97" class="LineNr"> 97 </span> <span class="PreProc">var</span> is-mul?/eax: boolean <span class="Special"><-</span> <a href='../123slice.subx.html#L120'>slice-equal?</a> word, <span class="Constant">"*"</span>
<span id="L98" class="LineNr"> 98 </span> compare is-mul?, <span class="Constant">0</span>
<span id="L99" class="LineNr"> 99 </span> <span class="PreProc">break-if-=</span>
<span id="L100" class="LineNr">100 </span> <span class="PreProc">var</span> _b/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L101" class="LineNr">101 </span> <span class="PreProc">var</span> b/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy _b
<span id="L102" class="LineNr">102 </span> <span class="PreProc">var</span> a/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L103" class="LineNr">103 </span> a <span class="Special"><-</span> multiply b
<span id="L104" class="LineNr">104 </span> <a href='rpn.mu.html#L124'>push-int-stack</a> stack, a
<span id="L105" class="LineNr">105 </span> <span class="PreProc">loop</span> $simplify:word-loop
<span id="L106" class="LineNr">106 </span> <span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span> <span class="muComment"># otherwise it's an int</span>
<span id="L108" class="LineNr">108 </span> <span class="PreProc">var</span> n/eax: int <span class="Special"><-</span> <a href='../311decimal-int.subx.html#L4'>parse-decimal-int-from-slice</a> word
<span id="L109" class="LineNr">109 </span> <a href='rpn.mu.html#L124'>push-int-stack</a> stack, n
<span id="L110" class="LineNr">110 </span> <span class="PreProc">loop</span>
<span id="L111" class="LineNr">111 </span> <span class="Delimiter">}</span>
<span id="L112" class="LineNr">112 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> <a href='rpn.mu.html#L136'>pop-int-stack</a> stack
<span id="L113" class="LineNr">113 </span> <span class="PreProc">return</span> result
<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span>
<span id="L115" class="LineNr">115 </span>
<span id="L116" class="LineNr">116 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L116'>initialize-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L57'>int-stack</a>), n: int <span class="Delimiter">{</span>
<span id="L117" class="LineNr">117 </span> <span class="PreProc">var</span> self/<span class="muRegEsi">esi</span>: (addr <a href='rpn.mu.html#L57'>int-stack</a>) <span class="Special"><-</span> copy _self
<span id="L118" class="LineNr">118 </span> <span class="PreProc">var</span> d/<span class="muRegEdi">edi</span>: (addr handle array int) <span class="Special"><-</span> get self, data
<span id="L119" class="LineNr">119 </span> populate d, n
<span id="L120" class="LineNr">120 </span> <span class="PreProc">var</span> top/eax: (addr int) <span class="Special"><-</span> get self, top
<span id="L121" class="LineNr">121 </span> copy-to *top, <span class="Constant">0</span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">}</span>
<span id="L123" class="LineNr">123 </span>
<span id="L124" class="LineNr">124 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L124'>push-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L57'>int-stack</a>), _val: int <span class="Delimiter">{</span>
<span id="L125" class="LineNr">125 </span> <span class="PreProc">var</span> self/<span class="muRegEsi">esi</span>: (addr <a href='rpn.mu.html#L57'>int-stack</a>) <span class="Special"><-</span> copy _self
<span id="L126" class="LineNr">126 </span> <span class="PreProc">var</span> top-addr/<span class="muRegEcx">ecx</span>: (addr int) <span class="Special"><-</span> get self, top
<span id="L127" class="LineNr">127 </span> <span class="PreProc">var</span> data-ah/<span class="muRegEdx">edx</span>: (addr handle array int) <span class="Special"><-</span> get self, data
<span id="L128" class="LineNr">128 </span> <span class="PreProc">var</span> data/eax: (addr array int) <span class="Special"><-</span> <a href='../120allocate.subx.html#L223'>lookup</a> *data-ah
<span id="L129" class="LineNr">129 </span> <span class="PreProc">var</span> top/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy *top-addr
<span id="L130" class="LineNr">130 </span> <span class="PreProc">var</span> dest-addr/<span class="muRegEdx">edx</span>: (addr int) <span class="Special"><-</span> index data, top
<span id="L131" class="LineNr">131 </span> <span class="PreProc">var</span> val/eax: int <span class="Special"><-</span> copy _val
<span id="L132" class="LineNr">132 </span> copy-to *dest-addr, val
<span id="L133" class="LineNr">133 </span> add-to *top-addr, <span class="Constant">1</span>
<span id="L134" class="LineNr">134 </span><span class="Delimiter">}</span>
<span id="L135" class="LineNr">135 </span>
<span id="L136" class="LineNr">136 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='rpn.mu.html#L136'>pop-int-stack</a></span> _self: (addr <a href='rpn.mu.html#L57'>int-stack</a>)<span class="PreProc"> -> </span>_/eax: int <span class="Delimiter">{</span>
<span id="L137" class="LineNr">137 </span> <span class="PreProc">var</span> self/<span class="muRegEsi">esi</span>: (addr <a href='rpn.mu.html#L57'>int-stack</a>) <span class="Special"><-</span> copy _self
<span id="L138" class="LineNr">138 </span> <span class="PreProc">var</span> top-addr/<span class="muRegEcx">ecx</span>: (addr int) <span class="Special"><-</span> get self, top
<span id="L139" class="LineNr">139 </span> <span class="Delimiter">{</span>
<span id="L140" class="LineNr">140 </span> compare *top-addr, <span class="Constant">0</span>
<span id="L141" class="LineNr">141 </span> <span class="PreProc">break-if-></span>
<span id="L142" class="LineNr">142 </span> <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L143" class="LineNr">143 </span> <span class="Delimiter">}</span>
<span id="L144" class="LineNr">144 </span> subtract-from *top-addr, <span class="Constant">1</span>
<span id="L145" class="LineNr">145 </span> <span class="PreProc">var</span> data-ah/<span class="muRegEdx">edx</span>: (addr handle array int) <span class="Special"><-</span> get self, data
<span id="L146" class="LineNr">146 </span> <span class="PreProc">var</span> data/eax: (addr array int) <span class="Special"><-</span> <a href='../120allocate.subx.html#L223'>lookup</a> *data-ah
<span id="L147" class="LineNr">147 </span> <span class="PreProc">var</span> top/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy *top-addr
<span id="L148" class="LineNr">148 </span> <span class="PreProc">var</span> result-addr/eax: (addr int) <span class="Special"><-</span> index data, top
<span id="L149" class="LineNr">149 </span> <span class="PreProc">var</span> val/eax: int <span class="Special"><-</span> copy *result-addr
<span id="L150" class="LineNr">150 </span> <span class="PreProc">return</span> val
<span id="L151" class="LineNr">151 </span><span class="Delimiter">}</span>
</pre>
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