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<a href='https://github.com/akkartik/mu/blob/main/linux/crenshaw2-1.subx'>https://github.com/akkartik/mu/blob/main/linux/crenshaw2-1.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Port of <a href="https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas">https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas</a></span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># which corresponds to the section "single digits" in <a href="https://compilers.iecc.com/crenshaw/tutor2.txt">https://compilers.iecc.com/crenshaw/tutor2.txt</a></span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># except that we support hex digits.</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># To run:</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># $ bootstrap/bootstrap translate [01]*.subx crenshaw2-1.subx -o crenshaw2-1</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo '3' |bootstrap/bootstrap run crenshaw2-1</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># Expected output:</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># # syscall(exit, 3)</span>
<span id="L10" class="LineNr"> 10 </span><span class="subxComment"># bb/copy-to-ebx 3/imm32</span>
<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># b8/copy-to-eax 1/imm32/exit</span>
<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># cd/syscall 0x80/imm8</span>
<span id="L13" class="LineNr"> 13 </span><span class="subxComment">#</span>
<span id="L14" class="LineNr"> 14 </span><span class="subxComment"># To run the generated output:</span>
<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># $ echo '3' |bootstrap/bootstrap run crenshaw2-1 > z1.subx</span>
<span id="L16" class="LineNr"> 16 </span><span class="subxComment"># $ bootstrap/bootstrap translate z1.subx -o z1</span>
<span id="L17" class="LineNr"> 17 </span><span class="subxComment"># $ bootstrap/bootstrap run z1</span>
<span id="L18" class="LineNr"> 18 </span><span class="subxComment"># $ echo $?</span>
<span id="L19" class="LineNr"> 19 </span><span class="subxComment"># 3</span>
<span id="L20" class="LineNr"> 20 </span><span class="subxComment">#</span>
<span id="L21" class="LineNr"> 21 </span><span class="subxComment"># Stdin must contain just a single hex digit. Other input will print an error:</span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># $ echo 'xyz' |bootstrap/bootstrap run crenshaw2-1</span>
<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># Error: integer expected</span>
<span id="L24" class="LineNr"> 24 </span><span class="subxComment">#</span>
<span id="L25" class="LineNr"> 25 </span><span class="subxComment"># Names in this file sometimes follow Crenshaw's original rather than my usual</span>
<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># naming conventions.</span>
<span id="L27" class="LineNr"> 27 </span>
<span id="L28" class="LineNr"> 28 </span>== code
<span id="L29" class="LineNr"> 29 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L30" class="LineNr"> 30 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L31" class="LineNr"> 31 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L32" class="LineNr"> 32 </span>
<span id="L33" class="LineNr"> 33 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># run tests if necessary, call 'compile' if not</span>
<span id="L34" class="LineNr"> 34 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L35" class="LineNr"> 35 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L36" class="LineNr"> 36 </span>
<span id="L37" class="LineNr"> 37 </span> <span class="subxComment"># initialize heap</span>
<span id="L38" class="LineNr"> 38 </span> <span class="subxS1Comment"># . Heap = new-segment(Heap-size)</span>
<span id="L39" class="LineNr"> 39 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L40" class="LineNr"> 40 </span> 68/push <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span>/imm32
<span id="L41" class="LineNr"> 41 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='120allocate.subx.html#L34'>Heap-size</a></span>/disp32 <span class="subxComment"># push *Heap-size</span>
<span id="L42" class="LineNr"> 42 </span> <span class="subxS2Comment"># . . call</span>
<span id="L43" class="LineNr"> 43 </span> e8/call <a href='104new-segment.subx.html#L40'>new-segment</a>/disp32
<span id="L44" class="LineNr"> 44 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L45" class="LineNr"> 45 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span> <span class="subxH1Comment"># - if argc > 1 and argv[1] == "test", then return run_tests()</span>
<span id="L48" class="LineNr"> 48 </span> <span class="subxComment"># if (argc <= 1) goto run-main</span>
<span id="L49" class="LineNr"> 49 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/disp8 1/imm32 <span class="subxComment"># compare *ebp</span>
<span id="L50" class="LineNr"> 50 </span> 7e/jump-if-<= $run-main/disp8
<span id="L51" class="LineNr"> 51 </span> <span class="subxComment"># if (!kernel-string-equal?(argv[1], "test")) goto run-main</span>
<span id="L52" class="LineNr"> 52 </span> <span class="subxS1Comment"># . eax = kernel-string-equal?(argv[1], "test")</span>
<span id="L53" class="LineNr"> 53 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L54" class="LineNr"> 54 </span> 68/push <span class="Constant">"test"</span>/imm32
<span id="L55" class="LineNr"> 55 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L56" class="LineNr"> 56 </span> <span class="subxS2Comment"># . . call</span>
<span id="L57" class="LineNr"> 57 </span> e8/call <a href='103kernel-string-equal.subx.html#L31'>kernel-string-equal?</a>/disp32
<span id="L58" class="LineNr"> 58 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L59" class="LineNr"> 59 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L60" class="LineNr"> 60 </span> <span class="subxS1Comment"># . if (eax == false) goto run-main</span>
<span id="L61" class="LineNr"> 61 </span> 3d/compare-eax-and 0/imm32/false
<span id="L62" class="LineNr"> 62 </span> 74/jump-if-= $run-main/disp8
<span id="L63" class="LineNr"> 63 </span> <span class="subxComment"># run-tests()</span>
<span id="L64" class="LineNr"> 64 </span> e8/call run-tests/disp32
<span id="L65" class="LineNr"> 65 </span> <span class="subxComment"># syscall(exit, *Num-test-failures)</span>
<span id="L66" class="LineNr"> 66 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx <span class="SpecialChar"><a href='102test.subx.html#L89'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to ebx</span>
<span id="L67" class="LineNr"> 67 </span> eb/jump $main:end/disp8
<span id="L68" class="LineNr"> 68 </span><span class="Constant">$run-main</span>:
<span id="L69" class="LineNr"> 69 </span> <span class="subxH1Comment"># - otherwise read a program from stdin and emit its translation to stdout</span>
<span id="L70" class="LineNr"> 70 </span> <span class="subxS1Comment"># . compile(Stdin, 1/stdout, 2/stderr, ed)</span>
<span id="L71" class="LineNr"> 71 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L72" class="LineNr"> 72 </span> 68/push 0/imm32/exit-descriptor
<span id="L73" class="LineNr"> 73 </span> 68/push 2/imm32/stderr
<span id="L74" class="LineNr"> 74 </span> 68/push 1/imm32/stdout
<span id="L75" class="LineNr"> 75 </span> 68/push <span class="SpecialChar"><a href='112read-byte.subx.html#L14'>Stdin</a></span>/imm32
<span id="L76" class="LineNr"> 76 </span> <span class="subxS2Comment"># . . call</span>
<span id="L77" class="LineNr"> 77 </span> e8/call <a href='crenshaw2-1.subx.html#L86'>compile</a>/disp32
<span id="L78" class="LineNr"> 78 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L79" class="LineNr"> 79 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/imm32 <span class="subxComment"># add to esp</span>
<span id="L80" class="LineNr"> 80 </span> <span class="subxComment"># syscall(exit, 0)</span>
<span id="L81" class="LineNr"> 81 </span> bb/copy-to-ebx 0/imm32
<span id="L82" class="LineNr"> 82 </span><span class="Constant">$main:end</span>:
<span id="L83" class="LineNr"> 83 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L84" class="LineNr"> 84 </span>
<span id="L85" class="LineNr"> 85 </span><span class="subxComment"># the main entry point</span>
<span id="L86" class="LineNr"> 86 </span><span class="subxFunction">compile</span>: <span class="subxComment"># in: (addr buffered-file), out: fd or (addr stream byte), err: fd or (addr stream byte), ed: (addr exit-descriptor)</span>
<span id="L87" class="LineNr"> 87 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L88" class="LineNr"> 88 </span> 55/push-ebp
<span id="L89" class="LineNr"> 89 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L90" class="LineNr"> 90 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L91" class="LineNr"> 91 </span> 50/push-eax
<span id="L92" class="LineNr"> 92 </span> 51/push-ecx
<span id="L93" class="LineNr"> 93 </span> <span class="subxComment"># prime the pump</span>
<span id="L94" class="LineNr"> 94 </span> <span class="subxS1Comment"># . Look = get-char(in)</span>
<span id="L95" class="LineNr"> 95 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L96" class="LineNr"> 96 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L97" class="LineNr"> 97 </span> <span class="subxS2Comment"># . . call</span>
<span id="L98" class="LineNr"> 98 </span> e8/call <a href='crenshaw2-1.subx.html#L508'>get-char</a>/disp32
<span id="L99" class="LineNr"> 99 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L100" class="LineNr">100 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L101" class="LineNr">101 </span> <span class="subxComment"># var num/ecx: (stream byte 7)</span>
<span id="L102" class="LineNr">102 </span> <span class="subxComment"># Numbers can be 32 bits or 8 hex bytes long. One of them will be in 'Look', so we need space for 7 bytes.</span>
<span id="L103" class="LineNr">103 </span> <span class="subxComment"># Sizing the stream just right buys us overflow-handling for free inside 'get-num'.</span>
<span id="L104" class="LineNr">104 </span> <span class="subxComment"># Add 12 bytes for 'read', 'write' and 'size' fields, for a total of 19 bytes, or 0x13 in hex.</span>
<span id="L105" class="LineNr">105 </span> <span class="subxComment"># The stack pointer is no longer aligned, so dump_stack() can be misleading past this point.</span>
<span id="L106" class="LineNr">106 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x13/imm32 <span class="subxComment"># subtract from esp</span>
<span id="L107" class="LineNr">107 </span> 89/copy 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ecx</span>
<span id="L108" class="LineNr">108 </span> <span class="subxComment"># initialize the stream</span>
<span id="L109" class="LineNr">109 </span> <span class="subxS1Comment"># . num->size = 7</span>
<span id="L110" class="LineNr">110 </span> c7 0/subop/copy 1/mod/*+disp8 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 7/imm32 <span class="subxComment"># copy to *(ecx+8)</span>
<span id="L111" class="LineNr">111 </span> <span class="subxS1Comment"># . clear-stream(num)</span>
<span id="L112" class="LineNr">112 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L113" class="LineNr">113 </span> 51/push-ecx
<span id="L114" class="LineNr">114 </span> <span class="subxS2Comment"># . . call</span>
<span id="L115" class="LineNr">115 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L116" class="LineNr">116 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L117" class="LineNr">117 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L118" class="LineNr">118 </span> <span class="subxComment"># read a digit from 'in' into 'num'</span>
<span id="L119" class="LineNr">119 </span> <span class="subxS1Comment"># . get-num(in, num, err, ed)</span>
<span id="L120" class="LineNr">120 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L121" class="LineNr">121 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x14/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+20)</span>
<span id="L122" class="LineNr">122 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+16)</span>
<span id="L123" class="LineNr">123 </span> 51/push-ecx/num
<span id="L124" class="LineNr">124 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L125" class="LineNr">125 </span> <span class="subxS2Comment"># . . call</span>
<span id="L126" class="LineNr">126 </span> e8/call <a href='crenshaw2-1.subx.html#L187'>get-num</a>/disp32
<span id="L127" class="LineNr">127 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L128" class="LineNr">128 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/imm32 <span class="subxComment"># add to esp</span>
<span id="L129" class="LineNr">129 </span> <span class="subxComment"># render 'num' into the following template on 'out':</span>
<span id="L130" class="LineNr">130 </span> <span class="subxComment"># bb/copy-to-ebx _num_</span>
<span id="L131" class="LineNr">131 </span> <span class="subxComment"># b8/copy-to-eax 1/imm32/exit</span>
<span id="L132" class="LineNr">132 </span> <span class="subxComment"># cd/syscall 0x80/imm8</span>
<span id="L133" class="LineNr">133 </span> <span class="subxComment">#</span>
<span id="L134" class="LineNr">134 </span> <span class="subxS1Comment"># . write(out, "bb/copy-to-ebx ")</span>
<span id="L135" class="LineNr">135 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L136" class="LineNr">136 </span> 68/push <span class="Constant">"bb/copy-to-ebx "</span>/imm32
<span id="L137" class="LineNr">137 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L138" class="LineNr">138 </span> <span class="subxS2Comment"># . . call</span>
<span id="L139" class="LineNr">139 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L140" class="LineNr">140 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L141" class="LineNr">141 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L142" class="LineNr">142 </span> <span class="subxS1Comment"># . write-stream(out, num)</span>
<span id="L143" class="LineNr">143 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L144" class="LineNr">144 </span> 51/push-ecx/num
<span id="L145" class="LineNr">145 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L146" class="LineNr">146 </span> <span class="subxS2Comment"># . . call</span>
<span id="L147" class="LineNr">147 </span> e8/call <a href='113write-stream.subx.html#L17'>write-stream</a>/disp32
<span id="L148" class="LineNr">148 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L149" class="LineNr">149 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L150" class="LineNr">150 </span> <span class="subxS1Comment"># . write(out, Newline)</span>
<span id="L151" class="LineNr">151 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L152" class="LineNr">152 </span> 68/push <span class="SpecialChar"><a href='102test.subx.html#L82'>Newline</a></span>/imm32
<span id="L153" class="LineNr">153 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L154" class="LineNr">154 </span> <span class="subxS2Comment"># . . call</span>
<span id="L155" class="LineNr">155 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L156" class="LineNr">156 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L157" class="LineNr">157 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L158" class="LineNr">158 </span> <span class="subxS1Comment"># . write(out, "b8/copy-to-eax 1/imm32/exit\n")</span>
<span id="L159" class="LineNr">159 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L160" class="LineNr">160 </span> 68/push <span class="Constant">"b8/copy-to-eax 1/imm32/exit\n"</span>/imm32
<span id="L161" class="LineNr">161 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L162" class="LineNr">162 </span> <span class="subxS2Comment"># . . call</span>
<span id="L163" class="LineNr">163 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L164" class="LineNr">164 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L165" class="LineNr">165 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L166" class="LineNr">166 </span> <span class="subxS1Comment"># . write(out, "cd/syscall 0x80/imm8\n")</span>
<span id="L167" class="LineNr">167 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L168" class="LineNr">168 </span> 68/push <span class="Constant">"cd/syscall 0x80/imm8\n"</span>/imm32
<span id="L169" class="LineNr">169 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L170" class="LineNr">170 </span> <span class="subxS2Comment"># . . call</span>
<span id="L171" class="LineNr">171 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L172" class="LineNr">172 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L173" class="LineNr">173 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L174" class="LineNr">174 </span><span class="Constant">$compile:end</span>:
<span id="L175" class="LineNr">175 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L176" class="LineNr">176 </span> 59/pop-to-ecx
<span id="L177" class="LineNr">177 </span> 58/pop-to-eax
<span id="L178" class="LineNr">178 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L179" class="LineNr">179 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L180" class="LineNr">180 </span> 5d/pop-to-ebp
<span id="L181" class="LineNr">181 </span> c3/return
<span id="L182" class="LineNr">182 </span>
<span id="L183" class="LineNr">183 </span><span class="subxComment"># Read a single digit into 'out'. Abort if there are none, or if there is no</span>
<span id="L184" class="LineNr">184 </span><span class="subxComment"># space in 'out'.</span>
<span id="L185" class="LineNr">185 </span><span class="subxComment"># Input comes from the global variable 'Look' (first byte) and the argument</span>
<span id="L186" class="LineNr">186 </span><span class="subxComment"># 'in' (rest). We leave the next byte from 'in' into 'Look' on exit.</span>
<span id="L187" class="LineNr">187 </span><span class="subxFunction">get-num</span>: <span class="subxComment"># in: (addr buffered-file), out: (addr stream byte), err: fd or (addr stream byte), ed: (addr exit-descriptor)</span>
<span id="L188" class="LineNr">188 </span> <span class="subxComment"># pseudocode:</span>
<span id="L189" class="LineNr">189 </span> <span class="subxComment"># if (!digit?(Look)) expected(ed, err, "integer")</span>
<span id="L190" class="LineNr">190 </span> <span class="subxComment"># if out->write >= out->size</span>
<span id="L191" class="LineNr">191 </span> <span class="subxComment"># write(err, "Error: too many digits in number\n")</span>
<span id="L192" class="LineNr">192 </span> <span class="subxComment"># stop(ed, 1)</span>
<span id="L193" class="LineNr">193 </span> <span class="subxComment"># out->data[out->write] = LSB(Look)</span>
<span id="L194" class="LineNr">194 </span> <span class="subxComment"># ++out->write</span>
<span id="L195" class="LineNr">195 </span> <span class="subxComment"># Look = get-char(in)</span>
<span id="L196" class="LineNr">196 </span> <span class="subxComment">#</span>
<span id="L197" class="LineNr">197 </span> <span class="subxComment"># registers:</span>
<span id="L198" class="LineNr">198 </span> <span class="subxComment"># in: esi</span>
<span id="L199" class="LineNr">199 </span> <span class="subxComment"># out: edi</span>
<span id="L200" class="LineNr">200 </span> <span class="subxComment"># out->write: ecx (cached copy; need to keep in sync)</span>
<span id="L201" class="LineNr">201 </span> <span class="subxComment"># out->size: edx</span>
<span id="L202" class="LineNr">202 </span> <span class="subxComment"># temporaries: eax, ebx</span>
<span id="L203" class="LineNr">203 </span> <span class="subxComment"># We can't allocate Look to a register because it gets written implicitly in</span>
<span id="L204" class="LineNr">204 </span> <span class="subxComment"># get-char in each iteration of the loop. (Thereby demonstrating that it's</span>
<span id="L205" class="LineNr">205 </span> <span class="subxComment"># not the right interface for us. But we'll keep it just to follow Crenshaw.)</span>
<span id="L206" class="LineNr">206 </span> <span class="subxComment">#</span>
<span id="L207" class="LineNr">207 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L208" class="LineNr">208 </span> 55/push-ebp
<span id="L209" class="LineNr">209 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L210" class="LineNr">210 </span> <span class="subxH1Comment"># - if (digit?(Look)) expected(ed, err, "integer")</span>
<span id="L211" class="LineNr">211 </span> <span class="subxS1Comment"># . eax = digit?(Look)</span>
<span id="L212" class="LineNr">212 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L213" class="LineNr">213 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='crenshaw2-1.subx.html#L553'>Look</a></span>/disp32 <span class="Normal"> . </span> <span class="subxComment"># push *Look</span>
<span id="L214" class="LineNr">214 </span> <span class="subxS2Comment"># . . call</span>
<span id="L215" class="LineNr">215 </span> e8/call <a href='crenshaw2-1.subx.html#L531'>digit?</a>/disp32
<span id="L216" class="LineNr">216 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L217" class="LineNr">217 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L218" class="LineNr">218 </span> <span class="subxS1Comment"># . if (eax == false)</span>
<span id="L219" class="LineNr">219 </span> 3d/compare-eax-and 0/imm32/false
<span id="L220" class="LineNr">220 </span> 75/jump-if-!= $get-num:main/disp8
<span id="L221" class="LineNr">221 </span> <span class="subxS1Comment"># . expected(ed, err, "integer")</span>
<span id="L222" class="LineNr">222 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L223" class="LineNr">223 </span> 68/push <span class="Constant">"integer"</span>/imm32
<span id="L224" class="LineNr">224 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+16)</span>
<span id="L225" class="LineNr">225 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x14/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+20)</span>
<span id="L226" class="LineNr">226 </span> <span class="subxS2Comment"># . . call</span>
<span id="L227" class="LineNr">227 </span> e8/call <a href='crenshaw2-1.subx.html#L466'>expected</a>/disp32 <span class="subxComment"># never returns</span>
<span id="L228" class="LineNr">228 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L229" class="LineNr">229 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L230" class="LineNr">230 </span><span class="Constant">$get-num:main</span>:
<span id="L231" class="LineNr">231 </span> <span class="subxH1Comment"># - otherwise read a digit</span>
<span id="L232" class="LineNr">232 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L233" class="LineNr">233 </span> 50/push-eax
<span id="L234" class="LineNr">234 </span> 51/push-ecx
<span id="L235" class="LineNr">235 </span> 52/push-edx
<span id="L236" class="LineNr">236 </span> 53/push-ebx
<span id="L237" class="LineNr">237 </span> 56/push-esi
<span id="L238" class="LineNr">238 </span> 57/push-edi
<span id="L239" class="LineNr">239 </span> <span class="subxComment"># read necessary variables to registers</span>
<span id="L240" class="LineNr">240 </span> <span class="subxComment"># esi = in</span>
<span id="L241" class="LineNr">241 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 6/r32/esi 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L242" class="LineNr">242 </span> <span class="subxComment"># edi = out</span>
<span id="L243" class="LineNr">243 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 7/r32/edi 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+12) to edi</span>
<span id="L244" class="LineNr">244 </span> <span class="subxComment"># ecx = out->write</span>
<span id="L245" class="LineNr">245 </span> 8b/copy 0/mod/indirect 7/rm32/edi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *edi to ecx</span>
<span id="L246" class="LineNr">246 </span> <span class="subxComment"># edx = out->size</span>
<span id="L247" class="LineNr">247 </span> 8b/copy 1/mod/*+disp8 7/rm32/edi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/edx 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(edi+8) to edx</span>
<span id="L248" class="LineNr">248 </span><span class="Constant">$get-num:loop</span>:
<span id="L249" class="LineNr">249 </span> <span class="subxComment"># if (out->write >= out->size) error</span>
<span id="L250" class="LineNr">250 </span> 39/compare 3/mod/direct 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># compare edx with ecx</span>
<span id="L251" class="LineNr">251 </span> 7d/jump-if-< $get-num:stage2/disp8
<span id="L252" class="LineNr">252 </span> <span class="subxS1Comment"># . error(ed, err, msg) # TODO: show full number</span>
<span id="L253" class="LineNr">253 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L254" class="LineNr">254 </span> 68/push <span class="Constant">"get-num: too many digits in number"</span>/imm32
<span id="L255" class="LineNr">255 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+16)</span>
<span id="L256" class="LineNr">256 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x14/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+20)</span>
<span id="L257" class="LineNr">257 </span> <span class="subxS2Comment"># . . call</span>
<span id="L258" class="LineNr">258 </span> e8/call <a href='114error.subx.html#L9'>error</a>/disp32 <span class="subxComment"># never returns</span>
<span id="L259" class="LineNr">259 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L260" class="LineNr">260 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L261" class="LineNr">261 </span><span class="Constant">$get-num:stage2</span>:
<span id="L262" class="LineNr">262 </span> <span class="subxComment"># out->data[out->write] = LSB(Look)</span>
<span id="L263" class="LineNr">263 </span> 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/edi 1/index/ecx <span class="Normal"> . </span> 3/r32/ebx 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy edi+ecx+12 to ebx</span>
<span id="L264" class="LineNr">264 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="SpecialChar"><a href='crenshaw2-1.subx.html#L553'>Look</a></span>/disp32 <span class="Normal"> . </span> <span class="subxComment"># copy *Look to eax</span>
<span id="L265" class="LineNr">265 </span> 88/copy-byte 0/mod/indirect 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/AL <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy byte at AL to *ebx</span>
<span id="L266" class="LineNr">266 </span> <span class="subxComment"># ++out->write</span>
<span id="L267" class="LineNr">267 </span> 41/increment-ecx
<span id="L268" class="LineNr">268 </span> <span class="subxComment"># Look = get-char(in)</span>
<span id="L269" class="LineNr">269 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L270" class="LineNr">270 </span> 56/push-esi
<span id="L271" class="LineNr">271 </span> <span class="subxS2Comment"># . . call</span>
<span id="L272" class="LineNr">272 </span> e8/call <a href='crenshaw2-1.subx.html#L508'>get-char</a>/disp32
<span id="L273" class="LineNr">273 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L274" class="LineNr">274 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L275" class="LineNr">275 </span><span class="Constant">$get-num:loop-end</span>:
<span id="L276" class="LineNr">276 </span> <span class="subxComment"># persist necessary variables from registers</span>
<span id="L277" class="LineNr">277 </span> 89/copy 0/mod/indirect 7/rm32/edi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ecx to *edi</span>
<span id="L278" class="LineNr">278 </span><span class="Constant">$get-num:end</span>:
<span id="L279" class="LineNr">279 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L280" class="LineNr">280 </span> 5f/pop-to-edi
<span id="L281" class="LineNr">281 </span> 5e/pop-to-esi
<span id="L282" class="LineNr">282 </span> 5b/pop-to-ebx
<span id="L283" class="LineNr">283 </span> 5a/pop-to-edx
<span id="L284" class="LineNr">284 </span> 59/pop-to-ecx
<span id="L285" class="LineNr">285 </span> 58/pop-to-eax
<span id="L286" class="LineNr">286 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L287" class="LineNr">287 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L288" class="LineNr">288 </span> 5d/pop-to-ebp
<span id="L289" class="LineNr">289 </span> c3/return
<span id="L290" class="LineNr">290 </span>
<span id="L291" class="LineNr">291 </span><span class="subxTest">test-get-num-reads-single-digit</span>:
<span id="L292" class="LineNr">292 </span> <span class="subxH1Comment"># - check that get-num returns first character if it's a digit</span>
<span id="L293" class="LineNr">293 </span> <span class="subxComment"># This test uses exit-descriptors. Use ebp for setting up local variables.</span>
<span id="L294" class="LineNr">294 </span> 55/push-ebp
<span id="L295" class="LineNr">295 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L296" class="LineNr">296 </span> <span class="subxComment"># clear all streams</span>
<span id="L297" class="LineNr">297 </span> <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L298" class="LineNr">298 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L299" class="LineNr">299 </span> 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32
<span id="L300" class="LineNr">300 </span> <span class="subxS2Comment"># . . call</span>
<span id="L301" class="LineNr">301 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L302" class="LineNr">302 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L303" class="LineNr">303 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L304" class="LineNr">304 </span> <span class="subxS1Comment"># . clear-stream($_test-buffered-file->buffer)</span>
<span id="L305" class="LineNr">305 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L306" class="LineNr">306 </span> 68/push $_test-buffered-file->buffer/imm32
<span id="L307" class="LineNr">307 </span> <span class="subxS2Comment"># . . call</span>
<span id="L308" class="LineNr">308 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L309" class="LineNr">309 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L310" class="LineNr">310 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L311" class="LineNr">311 </span> <span class="subxS1Comment"># . clear-stream(_test-output-stream)</span>
<span id="L312" class="LineNr">312 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L313" class="LineNr">313 </span> 68/push <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L314" class="LineNr">314 </span> <span class="subxS2Comment"># . . call</span>
<span id="L315" class="LineNr">315 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L316" class="LineNr">316 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L317" class="LineNr">317 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L318" class="LineNr">318 </span> <span class="subxS1Comment"># . clear-stream(_test-error-stream)</span>
<span id="L319" class="LineNr">319 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L320" class="LineNr">320 </span> 68/push <a href='115write-byte.subx.html#L438'>_test-error-stream</a>/imm32
<span id="L321" class="LineNr">321 </span> <span class="subxS2Comment"># . . call</span>
<span id="L322" class="LineNr">322 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L323" class="LineNr">323 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L324" class="LineNr">324 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L325" class="LineNr">325 </span> <span class="subxComment"># initialize 'in'</span>
<span id="L326" class="LineNr">326 </span> <span class="subxS1Comment"># . write(_test-stream, "3")</span>
<span id="L327" class="LineNr">327 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L328" class="LineNr">328 </span> 68/push <span class="Constant">"3"</span>/imm32
<span id="L329" class="LineNr">329 </span> 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32
<span id="L330" class="LineNr">330 </span> <span class="subxS2Comment"># . . call</span>
<span id="L331" class="LineNr">331 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L332" class="LineNr">332 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L333" class="LineNr">333 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L334" class="LineNr">334 </span> <span class="subxComment"># initialize exit-descriptor 'ed' for the call to 'get-num' below</span>
<span id="L335" class="LineNr">335 </span> <span class="subxS1Comment"># . var ed/eax: exit-descriptor</span>
<span id="L336" class="LineNr">336 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># subtract from esp</span>
<span id="L337" class="LineNr">337 </span> 89/copy 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to eax</span>
<span id="L338" class="LineNr">338 </span> <span class="subxS1Comment"># . tailor-exit-descriptor(ed, 16)</span>
<span id="L339" class="LineNr">339 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L340" class="LineNr">340 </span> 68/push 0x10/imm32/nbytes-of-args-for-get-num
<span id="L341" class="LineNr">341 </span> 50/push-eax/ed
<span id="L342" class="LineNr">342 </span> <span class="subxS2Comment"># . . call</span>
<span id="L343" class="LineNr">343 </span> e8/call <a href='110stop.subx.html#L44'>tailor-exit-descriptor</a>/disp32
<span id="L344" class="LineNr">344 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L345" class="LineNr">345 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L346" class="LineNr">346 </span> <span class="subxComment"># prime the pump</span>
<span id="L347" class="LineNr">347 </span> <span class="subxS1Comment"># . get-char(_test-buffered-file)</span>
<span id="L348" class="LineNr">348 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L349" class="LineNr">349 </span> 68/push <a href='112read-byte.subx.html#L318'>_test-buffered-file</a>/imm32
<span id="L350" class="LineNr">350 </span> <span class="subxS2Comment"># . . call</span>
<span id="L351" class="LineNr">351 </span> e8/call <a href='crenshaw2-1.subx.html#L508'>get-char</a>/disp32
<span id="L352" class="LineNr">352 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L353" class="LineNr">353 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L354" class="LineNr">354 </span> <span class="subxComment"># get-num(in, out, err, ed)</span>
<span id="L355" class="LineNr">355 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L356" class="LineNr">356 </span> 50/push-eax/ed
<span id="L357" class="LineNr">357 </span> 68/push <a href='115write-byte.subx.html#L438'>_test-error-stream</a>/imm32
<span id="L358" class="LineNr">358 </span> 68/push <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L359" class="LineNr">359 </span> 68/push <a href='112read-byte.subx.html#L318'>_test-buffered-file</a>/imm32
<span id="L360" class="LineNr">360 </span> <span class="subxS2Comment"># . . call</span>
<span id="L361" class="LineNr">361 </span> e8/call <a href='crenshaw2-1.subx.html#L187'>get-num</a>/disp32
<span id="L362" class="LineNr">362 </span> <span class="subxComment"># registers except esp may be clobbered at this point</span>
<span id="L363" class="LineNr">363 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L364" class="LineNr">364 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/imm32 <span class="subxComment"># add to esp</span>
<span id="L365" class="LineNr">365 </span> <span class="subxComment"># check-ints-equal(*_test-output-stream->data, '3', msg)</span>
<span id="L366" class="LineNr">366 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L367" class="LineNr">367 </span> 68/push <span class="Constant">"F - test-get-num-reads-single-digit"</span>/imm32
<span id="L368" class="LineNr">368 </span> 68/push 0x33/imm32
<span id="L369" class="LineNr">369 </span> b8/copy-to-eax <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L370" class="LineNr">370 </span> ff 6/subop/push 1/mod/*+disp8 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(eax+12)</span>
<span id="L371" class="LineNr">371 </span> <span class="subxS2Comment"># . . call</span>
<span id="L372" class="LineNr">372 </span> e8/call <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L373" class="LineNr">373 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L374" class="LineNr">374 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L375" class="LineNr">375 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L376" class="LineNr">376 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="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="subxTest">test-get-num-aborts-on-non-digit-in-Look</span>:
<span id="L381" class="LineNr">381 </span> <span class="subxH1Comment"># - check that get-num returns first character if it's a digit</span>
<span id="L382" class="LineNr">382 </span> <span class="subxComment"># This test uses exit-descriptors. Use ebp for setting up local variables.</span>
<span id="L383" class="LineNr">383 </span> 55/push-ebp
<span id="L384" class="LineNr">384 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L385" class="LineNr">385 </span> <span class="subxComment"># clear all streams</span>
<span id="L386" class="LineNr">386 </span> <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L387" class="LineNr">387 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L388" class="LineNr">388 </span> 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32
<span id="L389" class="LineNr">389 </span> <span class="subxS2Comment"># . . call</span>
<span id="L390" class="LineNr">390 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L391" class="LineNr">391 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L392" class="LineNr">392 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L393" class="LineNr">393 </span> <span class="subxS1Comment"># . clear-stream($_test-buffered-file->buffer)</span>
<span id="L394" class="LineNr">394 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L395" class="LineNr">395 </span> 68/push $_test-buffered-file->buffer/imm32
<span id="L396" class="LineNr">396 </span> <span class="subxS2Comment"># . . call</span>
<span id="L397" class="LineNr">397 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L398" class="LineNr">398 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L399" class="LineNr">399 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L400" class="LineNr">400 </span> <span class="subxS1Comment"># . clear-stream(_test-output-stream)</span>
<span id="L401" class="LineNr">401 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L402" class="LineNr">402 </span> 68/push <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L403" class="LineNr">403 </span> <span class="subxS2Comment"># . . call</span>
<span id="L404" class="LineNr">404 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L405" class="LineNr">405 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L406" class="LineNr">406 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L407" class="LineNr">407 </span> <span class="subxS1Comment"># . clear-stream(_test-error-stream)</span>
<span id="L408" class="LineNr">408 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L409" class="LineNr">409 </span> 68/push <a href='115write-byte.subx.html#L438'>_test-error-stream</a>/imm32
<span id="L410" class="LineNr">410 </span> <span class="subxS2Comment"># . . call</span>
<span id="L411" class="LineNr">411 </span> e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L412" class="LineNr">412 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L413" class="LineNr">413 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L414" class="LineNr">414 </span> <span class="subxComment"># initialize 'in'</span>
<span id="L415" class="LineNr">415 </span> <span class="subxS1Comment"># . write(_test-stream, "3")</span>
<span id="L416" class="LineNr">416 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L417" class="LineNr">417 </span> 68/push <span class="Constant">"3"</span>/imm32
<span id="L418" class="LineNr">418 </span> 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32
<span id="L419" class="LineNr">419 </span> <span class="subxS2Comment"># . . call</span>
<span id="L420" class="LineNr">420 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L421" class="LineNr">421 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L422" class="LineNr">422 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L423" class="LineNr">423 </span> <span class="subxComment"># initialize exit-descriptor 'ed' for the call to 'get-num' below</span>
<span id="L424" class="LineNr">424 </span> <span class="subxS1Comment"># . var ed/eax: exit-descriptor</span>
<span id="L425" class="LineNr">425 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># subtract from esp</span>
<span id="L426" class="LineNr">426 </span> 89/copy 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to eax</span>
<span id="L427" class="LineNr">427 </span> <span class="subxS1Comment"># . tailor-exit-descriptor(ed, 16)</span>
<span id="L428" class="LineNr">428 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L429" class="LineNr">429 </span> 68/push 0x10/imm32/nbytes-of-args-for-get-num
<span id="L430" class="LineNr">430 </span> 50/push-eax/ed
<span id="L431" class="LineNr">431 </span> <span class="subxS2Comment"># . . call</span>
<span id="L432" class="LineNr">432 </span> e8/call <a href='110stop.subx.html#L44'>tailor-exit-descriptor</a>/disp32
<span id="L433" class="LineNr">433 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L434" class="LineNr">434 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L435" class="LineNr">435 </span> <span class="subxComment"># *don't* prime the pump</span>
<span id="L436" class="LineNr">436 </span> <span class="subxComment"># get-num(in, out, err, ed)</span>
<span id="L437" class="LineNr">437 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L438" class="LineNr">438 </span> 50/push-eax/ed
<span id="L439" class="LineNr">439 </span> 68/push <a href='115write-byte.subx.html#L438'>_test-error-stream</a>/imm32
<span id="L440" class="LineNr">440 </span> 68/push <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L441" class="LineNr">441 </span> 68/push <a href='112read-byte.subx.html#L318'>_test-buffered-file</a>/imm32
<span id="L442" class="LineNr">442 </span> <span class="subxS2Comment"># . . call</span>
<span id="L443" class="LineNr">443 </span> e8/call <a href='crenshaw2-1.subx.html#L187'>get-num</a>/disp32
<span id="L444" class="LineNr">444 </span> <span class="subxComment"># registers except esp may be clobbered at this point</span>
<span id="L445" class="LineNr">445 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L446" class="LineNr">446 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/imm32 <span class="subxComment"># add to esp</span>
<span id="L447" class="LineNr">447 </span> <span class="subxComment"># check that get-num tried to call exit(1)</span>
<span id="L448" class="LineNr">448 </span> <span class="subxS1Comment"># . check-ints-equal(ed->value, 2, msg) # i.e. stop was called with value 1</span>
<span id="L449" class="LineNr">449 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L450" class="LineNr">450 </span> 68/push <span class="Constant">"F - test-get-num-aborts-on-non-digit-in-Look"</span>/imm32
<span id="L451" class="LineNr">451 </span> 68/push 2/imm32
<span id="L452" class="LineNr">452 </span> <span class="subxS2Comment"># . . push ed->value</span>
<span id="L453" class="LineNr">453 </span> ff 6/subop/push 1/mod/*+disp8 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(eax+4)</span>
<span id="L454" class="LineNr">454 </span> <span class="subxS2Comment"># . . call</span>
<span id="L455" class="LineNr">455 </span> e8/call <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L456" class="LineNr">456 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L457" class="LineNr">457 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L458" class="LineNr">458 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L459" class="LineNr">459 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L460" class="LineNr">460 </span> 5d/pop-to-ebp
<span id="L461" class="LineNr">461 </span> c3/return
<span id="L462" class="LineNr">462 </span>
<span id="L463" class="LineNr">463 </span><span class="subxComment">## helpers</span>
<span id="L464" class="LineNr">464 </span>
<span id="L465" class="LineNr">465 </span><span class="subxComment"># write(f, "Error: "+s+" expected\n") then stop(ed, 1)</span>
<span id="L466" class="LineNr">466 </span><span class="subxFunction">expected</span>: <span class="subxComment"># ed: (addr exit-descriptor), f: fd or (addr stream byte), s: (addr array byte)</span>
<span id="L467" class="LineNr">467 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L468" class="LineNr">468 </span> 55/push-ebp
<span id="L469" class="LineNr">469 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L470" class="LineNr">470 </span> <span class="subxComment"># write(f, "Error: ")</span>
<span id="L471" class="LineNr">471 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L472" class="LineNr">472 </span> 68/push <span class="Constant">"Error: "</span>/imm32
<span id="L473" class="LineNr">473 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L474" class="LineNr">474 </span> <span class="subxS2Comment"># . . call</span>
<span id="L475" class="LineNr">475 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L476" class="LineNr">476 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L477" class="LineNr">477 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L478" class="LineNr">478 </span> <span class="subxComment"># write(f, s)</span>
<span id="L479" class="LineNr">479 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L480" class="LineNr">480 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+16)</span>
<span id="L481" class="LineNr">481 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L482" class="LineNr">482 </span> <span class="subxS2Comment"># . . call</span>
<span id="L483" class="LineNr">483 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L484" class="LineNr">484 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L485" class="LineNr">485 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L486" class="LineNr">486 </span> <span class="subxComment"># write(f, " expected\n")</span>
<span id="L487" class="LineNr">487 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L488" class="LineNr">488 </span> 68/push <span class="Constant">" expected\n"</span>/imm32
<span id="L489" class="LineNr">489 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L490" class="LineNr">490 </span> <span class="subxS2Comment"># . . call</span>
<span id="L491" class="LineNr">491 </span> e8/call <a href='108write.subx.html#L24'>write</a>/disp32
<span id="L492" class="LineNr">492 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L493" class="LineNr">493 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L494" class="LineNr">494 </span> <span class="subxComment"># stop(ed, 1)</span>
<span id="L495" class="LineNr">495 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L496" class="LineNr">496 </span> 68/push 1/imm32
<span id="L497" class="LineNr">497 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L498" class="LineNr">498 </span> <span class="subxS2Comment"># . . call</span>
<span id="L499" class="LineNr">499 </span> e8/call <a href='110stop.subx.html#L92'>stop</a>/disp32
<span id="L500" class="LineNr">500 </span> <span class="subxComment"># should never get past this point</span>
<span id="L501" class="LineNr">501 </span><span class="Constant">$expected:dead-end</span>:
<span id="L502" class="LineNr">502 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L503" class="LineNr">503 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L504" class="LineNr">504 </span> 5d/pop-to-ebp
<span id="L505" class="LineNr">505 </span> c3/return
<span id="L506" class="LineNr">506 </span>
<span id="L507" class="LineNr">507 </span><span class="subxComment"># read a byte from 'f', and save it in 'Look'</span>
<span id="L508" class="LineNr">508 </span><span class="subxFunction">get-char</span>: <span class="subxComment"># f: (addr buffered-file)</span>
<span id="L509" class="LineNr">509 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L510" class="LineNr">510 </span> 55/push-ebp
<span id="L511" class="LineNr">511 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L512" class="LineNr">512 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L513" class="LineNr">513 </span> 50/push-eax
<span id="L514" class="LineNr">514 </span> <span class="subxComment"># eax = read-byte-buffered(f)</span>
<span id="L515" class="LineNr">515 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L516" class="LineNr">516 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L517" class="LineNr">517 </span> <span class="subxS2Comment"># . . call</span>
<span id="L518" class="LineNr">518 </span> e8/call <a href='112read-byte.subx.html#L38'>read-byte-buffered</a>/disp32
<span id="L519" class="LineNr">519 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L520" class="LineNr">520 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span>
<span id="L521" class="LineNr">521 </span> <span class="subxComment"># save eax to Look</span>
<span id="L522" class="LineNr">522 </span> 89/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="SpecialChar"><a href='crenshaw2-1.subx.html#L553'>Look</a></span>/disp32 <span class="Normal"> . </span> <span class="subxComment"># copy eax to *Look</span>
<span id="L523" class="LineNr">523 </span><span class="Constant">$get-char:end</span>:
<span id="L524" class="LineNr">524 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L525" class="LineNr">525 </span> 58/pop-to-eax
<span id="L526" class="LineNr">526 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L527" class="LineNr">527 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L528" class="LineNr">528 </span> 5d/pop-to-ebp
<span id="L529" class="LineNr">529 </span> c3/return
<span id="L530" class="LineNr">530 </span>
<span id="L531" class="LineNr">531 </span><span class="subxFunction">digit?</span>: <span class="subxComment"># c: int -> eax: boolean</span>
<span id="L532" class="LineNr">532 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L533" class="LineNr">533 </span> 55/push-ebp
<span id="L534" class="LineNr">534 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L535" class="LineNr">535 </span> <span class="subxComment"># eax = false</span>
<span id="L536" class="LineNr">536 </span> b8/copy-to-eax 0/imm32
<span id="L537" class="LineNr">537 </span> <span class="subxComment"># if (c < '0') return false</span>
<span id="L538" class="LineNr">538 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 0x30/imm32 <span class="subxComment"># compare *(ebp+8)</span>
<span id="L539" class="LineNr">539 </span> 7c/jump-if-< $digit?:end/disp8
<span id="L540" class="LineNr">540 </span> <span class="subxComment"># if (c > '9') return false</span>
<span id="L541" class="LineNr">541 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 0x39/imm32 <span class="subxComment"># compare *(ebp+8)</span>
<span id="L542" class="LineNr">542 </span> 7f/jump-if-> $digit?:end/disp8
<span id="L543" class="LineNr">543 </span> <span class="subxComment"># otherwise return true</span>
<span id="L544" class="LineNr">544 </span> b8/copy-to-eax 1/imm32
<span id="L545" class="LineNr">545 </span><span class="Constant">$digit?:end</span>:
<span id="L546" class="LineNr">546 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L547" class="LineNr">547 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L548" class="LineNr">548 </span> 5d/pop-to-ebp
<span id="L549" class="LineNr">549 </span> c3/return
<span id="L550" class="LineNr">550 </span>
<span id="L551" class="LineNr">551 </span>== data
<span id="L552" class="LineNr">552 </span>
<span id="L553" class="LineNr">553 </span><span class="SpecialChar">Look</span>: <span class="subxComment"># (char with some extra padding)</span>
<span id="L554" class="LineNr">554 </span> 0/imm32
<span id="L555" class="LineNr">555 </span>
<span id="L556" class="LineNr">556 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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