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<a href='https://github.com/akkartik/mu/blob/master/apps/mulisp.subx'>https://github.com/akkartik/mu/blob/master/apps/mulisp.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Toy lisp interpreter. Incomplete.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ ./ntranslate init.linux 0*.subx apps/subx-params.subx apps/mulisp.subx</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ ./a.elf</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># 42</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># => 42</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># ^D</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># $</span>
<span id="L10" class="LineNr"> 10 </span>
<span id="L11" class="LineNr"> 11 </span>== code
<span id="L12" class="LineNr"> 12 </span>
<span id="L13" class="LineNr"> 13 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># run tests if necessary, a REPL if not</span>
<span id="L14" class="LineNr"> 14 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L15" class="LineNr"> 15 </span> 89/<- %ebp 4/r32/esp
<span id="L16" class="LineNr"> 16 </span> <span class="subxComment"># initialize heap</span>
<span id="L17" class="LineNr"> 17 </span> (<a href='../053new-segment.subx.html#L41'>new-segment</a> <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="L18" class="LineNr"> 18 </span> {
<span id="L19" class="LineNr"> 19 </span> <span class="subxComment"># if (argc <= 1) break</span>
<span id="L20" class="LineNr"> 20 </span> 81 7/subop/compare *ebp 1/imm32
<span id="L21" class="LineNr"> 21 </span> 7e/jump-if-lesser-or-equal <span class="Constant">break</span>/disp8
<span id="L22" class="LineNr"> 22 </span> <span class="subxComment"># if (argv[1] != "test")) break</span>
<span id="L23" class="LineNr"> 23 </span> (<a href='../052kernel-string-equal.subx.html#L31'>kernel-string-equal?</a> *(ebp+8) <span class="Constant">"test"</span>) <span class="subxComment"># => eax</span>
<span id="L24" class="LineNr"> 24 </span> 3d/compare-eax-and 0/imm32
<span id="L25" class="LineNr"> 25 </span> 74/jump-if-equal <span class="Constant">break</span>/disp8
<span id="L26" class="LineNr"> 26 </span> <span class="subxComment">#</span>
<span id="L27" class="LineNr"> 27 </span> (run-tests)
<span id="L28" class="LineNr"> 28 </span> <span class="subxComment"># syscall(exit, *Num-test-failures)</span>
<span id="L29" class="LineNr"> 29 </span> 8b/-> *<span class="SpecialChar"><a href='../051test.subx.html#L90'>Num-test-failures</a></span> 3/r32/ebx
<span id="L30" class="LineNr"> 30 </span> eb/jump $main:end/disp8
<span id="L31" class="LineNr"> 31 </span> }
<span id="L32" class="LineNr"> 32 </span> (<a href='mulisp.subx.html#L77'>repl</a> <span class="SpecialChar"><a href='../061read-byte.subx.html#L14'>Stdin</a></span> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L33" class="LineNr"> 33 </span> <span class="subxComment"># syscall(exit, 0)</span>
<span id="L34" class="LineNr"> 34 </span> bb/copy-to-ebx 0/imm32
<span id="L35" class="LineNr"> 35 </span><span class="Constant">$main:end</span>:
<span id="L36" class="LineNr"> 36 </span> b8/copy-to-eax 1/imm32/exit
<span id="L37" class="LineNr"> 37 </span> cd/syscall 0x80/imm8
<span id="L38" class="LineNr"> 38 </span>
<span id="L39" class="LineNr"> 39 </span><span class="subxComment"># Data structures</span>
<span id="L40" class="LineNr"> 40 </span><span class="subxComment">#</span>
<span id="L41" class="LineNr"> 41 </span><span class="subxComment"># Lisp is dynamically typed. Values always carry around knowledge of their</span>
<span id="L42" class="LineNr"> 42 </span><span class="subxComment"># type.</span>
<span id="L43" class="LineNr"> 43 </span><span class="subxComment">#</span>
<span id="L44" class="LineNr"> 44 </span><span class="subxComment"># There's several types of types in the description below, so we need a</span>
<span id="L45" class="LineNr"> 45 </span><span class="subxComment"># glossary and notational convention to disambiguate:</span>
<span id="L46" class="LineNr"> 46 </span><span class="subxComment"># lisp type: what Lisp code can see. Looks how you type it at the prompt.</span>
<span id="L47" class="LineNr"> 47 </span><span class="subxComment"># nil num char string symbol pair array</span>
<span id="L48" class="LineNr"> 48 </span><span class="subxComment"># type tag: the numeric code for a lisp type. All caps.</span>
<span id="L49" class="LineNr"> 49 </span><span class="subxComment"># NIL NUM CHAR STRING SYMBOL PAIR ARRAY</span>
<span id="L50" class="LineNr"> 50 </span><span class="subxComment"># memory type: a type specifying memory layout at the SubX level. Starts</span>
<span id="L51" class="LineNr"> 51 </span><span class="subxComment"># with a '$'.</span>
<span id="L52" class="LineNr"> 52 </span><span class="subxComment"># $int $array $(address _)</span>
<span id="L53" class="LineNr"> 53 </span><span class="subxComment">#</span>
<span id="L54" class="LineNr"> 54 </span><span class="subxComment"># Lisp values are represented in memory by the _cell_ data structure. A cell</span>
<span id="L55" class="LineNr"> 55 </span><span class="subxComment"># is 12 bytes long:</span>
<span id="L56" class="LineNr"> 56 </span><span class="subxComment"># tag: $int (4 bytes; we're not concerned about wasting space)</span>
<span id="L57" class="LineNr"> 57 </span><span class="subxComment"># data: 8 bytes whose contents and meaning depend on tag</span>
<span id="L58" class="LineNr"> 58 </span><span class="subxComment">#</span>
<span id="L59" class="LineNr"> 59 </span><span class="subxComment"># What values of the different Lisp types look like in memory:</span>
<span id="L60" class="LineNr"> 60 </span><span class="subxComment"># - nil: cell{ tag: 0/NIL, data: 0 0 }</span>
<span id="L61" class="LineNr"> 61 </span><span class="subxComment"># - num: cell{ tag: 1/NUM, data: $int 0 }</span>
<span id="L62" class="LineNr"> 62 </span><span class="subxComment"># data contains the number</span>
<span id="L63" class="LineNr"> 63 </span><span class="subxComment"># - char: cell{ tag: 2/CHAR, data: $int 0 }</span>
<span id="L64" class="LineNr"> 64 </span><span class="subxComment"># data contains the utf-8 code of the character (no compound glyphs, no</span>
<span id="L65" class="LineNr"> 65 </span><span class="subxComment"># modifiers, etc., etc.)</span>
<span id="L66" class="LineNr"> 66 </span><span class="subxComment"># - string: cell{ tag: 3/STRING, data: $(address stream byte)</span>
<span id="L67" class="LineNr"> 67 </span><span class="subxComment"># data contains an (address array byte) containing the string in utf-8</span>
<span id="L68" class="LineNr"> 68 </span><span class="subxComment"># - symbol: cell{ tag: 4/SYMBOL, data: $(address array byte) 0 }</span>
<span id="L69" class="LineNr"> 69 </span><span class="subxComment"># data contains an (address array byte) containing the name of the symbol in utf-8</span>
<span id="L70" class="LineNr"> 70 </span><span class="subxComment"># alternatively, data could contain an index into the table of interned symbols</span>
<span id="L71" class="LineNr"> 71 </span><span class="subxComment"># - pair: cell{ tag: 5/PAIR, data: $(address cell) $(address cell) }</span>
<span id="L72" class="LineNr"> 72 </span><span class="subxComment"># data contains pointers to car and cdr</span>
<span id="L73" class="LineNr"> 73 </span><span class="subxComment"># - array: cell{ tag: 6/ARRAY, data: $tag $(address stream data)</span>
<span id="L74" class="LineNr"> 74 </span><span class="subxComment"># data contains a pointer to an array of 8-byte data fields and the common</span>
<span id="L75" class="LineNr"> 75 </span><span class="subxComment"># tag for them all</span>
<span id="L76" class="LineNr"> 76 </span>
<span id="L77" class="LineNr"> 77 </span><span class="subxFunction">repl</span>: <span class="subxComment"># in : (address buffered-file), out : (address buffered-file)</span>
<span id="L78" class="LineNr"> 78 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L79" class="LineNr"> 79 </span> 55/push-ebp
<span id="L80" class="LineNr"> 80 </span> 89/<- %ebp 4/r32/esp
<span id="L81" class="LineNr"> 81 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L82" class="LineNr"> 82 </span> 50/push-eax
<span id="L83" class="LineNr"> 83 </span> {
<span id="L84" class="LineNr"> 84 </span> (<a href='mulisp.subx.html#L107'>lisp-read</a> <span class="SpecialChar"><a href='../061read-byte.subx.html#L14'>Stdin</a></span>) <span class="subxComment"># => eax : (address cell)</span>
<span id="L85" class="LineNr"> 85 </span> <span class="subxComment"># if (eax == 0) break</span>
<span id="L86" class="LineNr"> 86 </span> 3d/compare-eax-and 0/imm32
<span id="L87" class="LineNr"> 87 </span> 74/jump-if-equal <span class="Constant">break</span>/disp8
<span id="L88" class="LineNr"> 88 </span> <span class="subxComment">#</span>
<span id="L89" class="LineNr"> 89 </span> (<a href='mulisp.subx.html#L201'>lisp-eval</a> %eax) <span class="subxComment"># => eax : (address cell)</span>
<span id="L90" class="LineNr"> 90 </span> (<a href='mulisp.subx.html#L214'>lisp-print</a> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span> %eax)
<span id="L91" class="LineNr"> 91 </span> eb/jump <span class="Constant">loop</span>/disp8
<span id="L92" class="LineNr"> 92 </span> }
<span id="L93" class="LineNr"> 93 </span><span class="Constant">$repl:end</span>:
<span id="L94" class="LineNr"> 94 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L95" class="LineNr"> 95 </span> 58/pop-to-eax
<span id="L96" class="LineNr"> 96 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L97" class="LineNr"> 97 </span> 89/<- %esp 5/r32/ebp
<span id="L98" class="LineNr"> 98 </span> 5d/pop-to-ebp
<span id="L99" class="LineNr"> 99 </span> c3/return
<span id="L100" class="LineNr">100 </span>
<span id="L101" class="LineNr">101 </span><span class="subxComment"># numbers start with a digit and are always in hex</span>
<span id="L102" class="LineNr">102 </span><span class="subxComment"># characters start with a backslash</span>
<span id="L103" class="LineNr">103 </span><span class="subxComment"># pairs start with '('</span>
<span id="L104" class="LineNr">104 </span><span class="subxComment"># arrays start with '['</span>
<span id="L105" class="LineNr">105 </span><span class="subxComment"># symbols start with anything else but quote, backquote, unquote or splice</span>
<span id="L106" class="LineNr">106 </span><span class="subxComment"># only one s-expression per line</span>
<span id="L107" class="LineNr">107 </span><span class="subxFunction">lisp-read</span>: <span class="subxComment"># in : (address buffered-file) -> eax : (address cell)</span>
<span id="L108" class="LineNr">108 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L109" class="LineNr">109 </span> 55/push-ebp
<span id="L110" class="LineNr">110 </span> 89/<- %ebp 4/r32/esp
<span id="L111" class="LineNr">111 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L112" class="LineNr">112 </span> 51/push-ecx
<span id="L113" class="LineNr">113 </span> <span class="subxComment"># var s/ecx : (stream byte 512)</span>
<span id="L114" class="LineNr">114 </span> 81 5/subop/subtract %esp 0x200/imm32
<span id="L115" class="LineNr">115 </span> 68/push 0x200/imm32/size
<span id="L116" class="LineNr">116 </span> 68/push 0/imm32/read
<span id="L117" class="LineNr">117 </span> 68/push 0/imm32/write
<span id="L118" class="LineNr">118 </span> 89/<- %ecx 4/r32/esp
<span id="L119" class="LineNr">119 </span> {
<span id="L120" class="LineNr">120 </span> <span class="subxComment"># read line into s</span>
<span id="L121" class="LineNr">121 </span> (<a href='../055stream.subx.html#L17'>clear-stream</a> %ecx)
<span id="L122" class="LineNr">122 </span> (<a href='../071read-line.subx.html#L9'>read-line-buffered</a> *(ebp+8) %ecx)
<span id="L123" class="LineNr">123 </span> <span class="subxComment"># if (s->write == 0) return null</span>
<span id="L124" class="LineNr">124 </span> {
<span id="L125" class="LineNr">125 </span> 81 7/subop/compare *ecx 0/imm32
<span id="L126" class="LineNr">126 </span> 75/jump-if-not-equal <span class="Constant">break</span>/disp8
<span id="L127" class="LineNr">127 </span> b8/copy-to-eax 0/imm32/eof
<span id="L128" class="LineNr">128 </span> eb/jump $lisp-read:end/disp8
<span id="L129" class="LineNr">129 </span> }
<span id="L130" class="LineNr">130 </span> <span class="subxS1Comment"># ...</span>
<span id="L131" class="LineNr">131 </span><span class="CommentedCode">#? eb/jump loop/disp8</span>
<span id="L132" class="LineNr">132 </span> }
<span id="L133" class="LineNr">133 </span> <span class="subxComment"># return s</span>
<span id="L134" class="LineNr">134 </span> 89/<- %eax 1/r32/ecx
<span id="L135" class="LineNr">135 </span><span class="Constant">$lisp-read:end</span>:
<span id="L136" class="LineNr">136 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L137" class="LineNr">137 </span> 81 0/subop/add %esp 0x20c/imm32
<span id="L138" class="LineNr">138 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L139" class="LineNr">139 </span> 59/pop-to-ecx
<span id="L140" class="LineNr">140 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L141" class="LineNr">141 </span> 89/<- %esp 5/r32/ebp
<span id="L142" class="LineNr">142 </span> 5d/pop-to-ebp
<span id="L143" class="LineNr">143 </span> c3/return
<span id="L144" class="LineNr">144 </span>
<span id="L145" class="LineNr">145 </span><span class="subxComment"># lisp-read: in : (address buffered-file) -> (address cell)</span>
<span id="L146" class="LineNr">146 </span><span class="subxComment"># token tmp = next-mulisp-token(in)</span>
<span id="L147" class="LineNr">147 </span><span class="subxComment"># if is-int(tmp) return cell(tmp)</span>
<span id="L148" class="LineNr">148 </span><span class="subxComment"># if is-string(tmp) return cell(tmp)</span>
<span id="L149" class="LineNr">149 </span><span class="subxComment"># if is-pair(tmp) ...</span>
<span id="L150" class="LineNr">150 </span><span class="subxComment"># if is-array(tmp) ...</span>
<span id="L151" class="LineNr">151 </span>
<span id="L152" class="LineNr">152 </span><span class="subxFunction">next-mulisp-token</span>: <span class="subxComment"># in : (address buffered-file), line : (address stream), result : (address slice)</span>
<span id="L153" class="LineNr">153 </span> <span class="subxComment"># pseudocode:</span>
<span id="L154" class="LineNr">154 </span> <span class="subxComment"># if (line->read >= line->write)</span>
<span id="L155" class="LineNr">155 </span> <span class="subxComment"># read-line-buffered(in, line)</span>
<span id="L156" class="LineNr">156 </span> <span class="subxComment"># recurse</span>
<span id="L157" class="LineNr">157 </span> <span class="subxComment"># if (line->data[line->read] == ' ')</span>
<span id="L158" class="LineNr">158 </span> <span class="subxComment"># skip-chars-matching-whitespace(line)</span>
<span id="L159" class="LineNr">159 </span> <span class="subxComment"># recurse</span>
<span id="L160" class="LineNr">160 </span> <span class="subxComment"># if (line->data[line->read] == '#')</span>
<span id="L161" class="LineNr">161 </span> <span class="subxComment"># read-line-buffered(in, line)</span>
<span id="L162" class="LineNr">162 </span> <span class="subxComment"># recurse</span>
<span id="L163" class="LineNr">163 </span> <span class="subxComment"># eax = line->data[line->read]</span>
<span id="L164" class="LineNr">164 </span> <span class="subxComment"># if (eax == '"')</span>
<span id="L165" class="LineNr">165 </span> <span class="subxComment"># result->start = &line->data[line->read]</span>
<span id="L166" class="LineNr">166 </span> <span class="subxComment"># skip-string(in)</span>
<span id="L167" class="LineNr">167 </span> <span class="subxComment"># result->end = &line->data[line->read]</span>
<span id="L168" class="LineNr">168 </span> <span class="subxComment"># return</span>
<span id="L169" class="LineNr">169 </span> <span class="subxComment"># if (is-digit(eax))</span>
<span id="L170" class="LineNr">170 </span> <span class="subxComment"># result->start = &line->data[line->read]</span>
<span id="L171" class="LineNr">171 </span> <span class="subxComment"># skip-hex-int(in)</span>
<span id="L172" class="LineNr">172 </span> <span class="subxComment"># result->end = &line->data[line->read]</span>
<span id="L173" class="LineNr">173 </span> <span class="subxComment"># return</span>
<span id="L174" class="LineNr">174 </span> <span class="subxComment"># if (eax in '(' ')' '[' ']')</span>
<span id="L175" class="LineNr">175 </span> <span class="subxComment"># result->start = &line->data[line->read]</span>
<span id="L176" class="LineNr">176 </span> <span class="subxComment"># ++line->read</span>
<span id="L177" class="LineNr">177 </span> <span class="subxComment"># result->en = &line->data[line->read]</span>
<span id="L178" class="LineNr">178 </span> <span class="subxComment"># return</span>
<span id="L179" class="LineNr">179 </span> <span class="subxComment"># else</span>
<span id="L180" class="LineNr">180 </span> <span class="subxComment"># result->start = &line->data[line->read]</span>
<span id="L181" class="LineNr">181 </span> <span class="subxComment"># skip-lisp-word(line)</span>
<span id="L182" class="LineNr">182 </span> <span class="subxComment"># result->en = &line->data[line->read]</span>
<span id="L183" class="LineNr">183 </span> <span class="subxComment"># return</span>
<span id="L184" class="LineNr">184 </span> <span class="subxComment">#</span>
<span id="L185" class="LineNr">185 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L186" class="LineNr">186 </span> 55/push-ebp
<span id="L187" class="LineNr">187 </span> 89/<- %ebp 4/r32/esp
<span id="L188" class="LineNr">188 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L189" class="LineNr">189 </span><span class="Constant">$next-mulisp-token:end</span>:
<span id="L190" class="LineNr">190 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L191" class="LineNr">191 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L192" class="LineNr">192 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L193" class="LineNr">193 </span> 89/<- %esp 5/r32/ebp
<span id="L194" class="LineNr">194 </span> 5d/pop-to-ebp
<span id="L195" class="LineNr">195 </span> c3/return
<span id="L196" class="LineNr">196 </span>
<span id="L197" class="LineNr">197 </span><span class="subxFunction">new-int-cell</span>: <span class="subxComment"># in : (address slice) -> eax : (address cell)</span>
<span id="L198" class="LineNr">198 </span>
<span id="L199" class="LineNr">199 </span><span class="subxFunction">new-string-cell</span>: <span class="subxComment"># in : (address slice) -> eax : (address cell)</span>
<span id="L200" class="LineNr">200 </span>
<span id="L201" class="LineNr">201 </span><span class="subxFunction">lisp-eval</span>: <span class="subxComment"># in : (address cell) -> eax : (address cell)</span>
<span id="L202" class="LineNr">202 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L203" class="LineNr">203 </span> 55/push-ebp
<span id="L204" class="LineNr">204 </span> 89/<- %ebp 4/r32/esp
<span id="L205" class="LineNr">205 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L206" class="LineNr">206 </span> 8b/-> *(ebp+8) 0/r32/eax
<span id="L207" class="LineNr">207 </span><span class="Constant">$lisp-eval:end</span>:
<span id="L208" class="LineNr">208 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L209" class="LineNr">209 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L210" class="LineNr">210 </span> 89/<- %esp 5/r32/ebp
<span id="L211" class="LineNr">211 </span> 5d/pop-to-ebp
<span id="L212" class="LineNr">212 </span> c3/return
<span id="L213" class="LineNr">213 </span>
<span id="L214" class="LineNr">214 </span><span class="subxFunction">lisp-print</span>: <span class="subxComment"># out : (address buffered-file), x : (address cell)</span>
<span id="L215" class="LineNr">215 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L216" class="LineNr">216 </span> 55/push-ebp
<span id="L217" class="LineNr">217 </span> 89/<- %ebp 4/r32/esp
<span id="L218" class="LineNr">218 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L219" class="LineNr">219 </span> <span class="subxComment"># write(x)</span>
<span id="L220" class="LineNr">220 </span> (<a href='../065write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span> <span class="Constant">"=> "</span>)
<span id="L221" class="LineNr">221 </span> (<a href='../074write-stream-data.subx.html#L11'>write-stream-data</a> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span> *(ebp+0xc))
<span id="L222" class="LineNr">222 </span> (<a href='../064write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L223" class="LineNr">223 </span><span class="Constant">$lisp-print:end</span>:
<span id="L224" class="LineNr">224 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L225" class="LineNr">225 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L226" class="LineNr">226 </span> 89/<- %esp 5/r32/ebp
<span id="L227" class="LineNr">227 </span> 5d/pop-to-ebp
<span id="L228" class="LineNr">228 </span> c3/return
<span id="L229" class="LineNr">229 </span>
<span id="L230" class="LineNr">230 </span>== data
<span id="L231" class="LineNr">231 </span>
<span id="L232" class="LineNr">232 </span><span class="SpecialChar">Nil</span>:
<span id="L233" class="LineNr">233 </span> 0/imm32/tag
<span id="L234" class="LineNr">234 </span> 0/imm32/data
</pre>
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