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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## port of <a href="https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas">https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas</a></span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># corresponds to the section "single digits" in <a href="https://compilers.iecc.com/crenshaw/tutor2.txt">https://compilers.iecc.com/crenshaw/tutor2.txt</a></span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># To run (from the subx directory):</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment"># $ subx translate *.subx apps/crenshaw2.1.subx -o crenshaw 2.1</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># $ echo '3' |subx run apps/crenshaw2.1 |xxd -</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># Expected output:</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># TODO</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">#</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment"># The output is the code a function would need to include, returning the</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment"># result in EAX.</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">#</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment"># Major note: byte strings are not null-terminated. Instead they're prefixed</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment"># with a 32-bit length.</span>
<span id="L15" class="LineNr"> 15 </span>
<span id="L16" class="LineNr"> 16 </span>== code
<span id="L17" class="LineNr"> 17 </span><span class="Comment"># instruction effective address operand displacement immediate</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment"># op subop mod rm32 base index scale r32</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment"># 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L20" class="LineNr"> 20 </span>
<span id="L21" class="LineNr"> 21 </span><span class="Comment"># main:</span>
<span id="L22" class="LineNr"> 22 </span> <span class="Comment"># abort("Integer")</span>
<span id="L23" class="LineNr"> 23 </span> <span class="Comment"># push args</span>
<span id="L24" class="LineNr"> 24 </span> 68/push "Integer"/imm32
<span id="L25" class="LineNr"> 25 </span> <span class="Comment"># call</span>
<span id="L26" class="LineNr"> 26 </span> e8/call abort/disp32
<span id="L27" class="LineNr"> 27 </span> <span class="Comment"># discard arg</span>
<span id="L28" class="LineNr"> 28 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Comment"># exit(0)</span>
<span id="L30" class="LineNr"> 30 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/imm32 <span class="Comment"># copy to EBX</span>
<span id="L31" class="LineNr"> 31 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/exit <span class="Comment"># copy to EAX</span>
<span id="L32" class="LineNr"> 32 </span> cd/syscall 0x80/imm8
<span id="L33" class="LineNr"> 33 </span>
<span id="L34" class="LineNr"> 34 </span><span class="SalientComment">## helpers</span>
<span id="L35" class="LineNr"> 35 </span>
<span id="L36" class="LineNr"> 36 </span><span class="Comment"># print error message and exit</span>
<span id="L37" class="LineNr"> 37 </span><span class="Comment"># really maps to the 'Expected' function in Crenshaw</span>
<span id="L38" class="LineNr"> 38 </span>abort: <span class="Comment"># s : (address array byte) -> <void></span>
<span id="L39" class="LineNr"> 39 </span> <span class="Comment"># error(s)</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Comment"># push args</span>
<span id="L41" class="LineNr"> 41 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(ESP+4)</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Comment"># call</span>
<span id="L43" class="LineNr"> 43 </span> e8/call error/disp32
<span id="L44" class="LineNr"> 44 </span> <span class="Comment"># discard arg</span>
<span id="L45" class="LineNr"> 45 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Comment"># exit(1)</span>
<span id="L47" class="LineNr"> 47 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy to EBX</span>
<span id="L48" class="LineNr"> 48 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/exit <span class="Comment"># copy to EAX</span>
<span id="L49" class="LineNr"> 49 </span> cd/syscall 0x80/imm8
<span id="L50" class="LineNr"> 50 </span>
<span id="L51" class="LineNr"> 51 </span><span class="Comment"># print out "Error: #{s} expected\n" to stderr</span>
<span id="L52" class="LineNr"> 52 </span>error: <span class="Comment"># s : (address array byte) -> <void></span>
<span id="L53" class="LineNr"> 53 </span> <span class="Comment"># write_stderr("Error: ")</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Comment"># push args</span>
<span id="L55" class="LineNr"> 55 </span> 68/push "Error: "/imm32
<span id="L56" class="LineNr"> 56 </span> <span class="Comment"># call</span>
<span id="L57" class="LineNr"> 57 </span> e8/call write_stderr/disp32
<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># discard arg</span>
<span id="L59" class="LineNr"> 59 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Comment"># write_stderr(s)</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Comment"># push args</span>
<span id="L62" class="LineNr"> 62 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(ESP+4)</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Comment"># call</span>
<span id="L64" class="LineNr"> 64 </span> e8/call write_stderr/disp32
<span id="L65" class="LineNr"> 65 </span> <span class="Comment"># discard arg</span>
<span id="L66" class="LineNr"> 66 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Comment"># write_stderr(" expected")</span>
<span id="L68" class="LineNr"> 68 </span> <span class="Comment"># push args</span>
<span id="L69" class="LineNr"> 69 </span> 68/push " expected"/imm32
<span id="L70" class="LineNr"> 70 </span> <span class="Comment"># call</span>
<span id="L71" class="LineNr"> 71 </span> e8/call write_stderr/disp32
<span id="L72" class="LineNr"> 72 </span> <span class="Comment"># discard arg</span>
<span id="L73" class="LineNr"> 73 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Comment"># write_stderr("\n")</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Comment"># push args</span>
<span id="L76" class="LineNr"> 76 </span> 68/push Newline/imm32
<span id="L77" class="LineNr"> 77 </span> <span class="Comment"># call</span>
<span id="L78" class="LineNr"> 78 </span> e8/call write_stderr/disp32
<span id="L79" class="LineNr"> 79 </span> <span class="Comment"># discard arg</span>
<span id="L80" class="LineNr"> 80 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Comment"># end</span>
<span id="L82" class="LineNr"> 82 </span> c3/return
<span id="L83" class="LineNr"> 83 </span>
<span id="L84" class="LineNr"> 84 </span>write_stdout: <span class="Comment"># s : (address array byte) -> <void></span>
<span id="L85" class="LineNr"> 85 </span> <span class="Comment"># prolog</span>
<span id="L86" class="LineNr"> 86 </span> 55/push-EBP
<span id="L87" class="LineNr"> 87 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Comment"># save registers</span>
<span id="L89" class="LineNr"> 89 </span> 50/push-EAX
<span id="L90" class="LineNr"> 90 </span> 51/push-ECX
<span id="L91" class="LineNr"> 91 </span> 52/push-EDX
<span id="L92" class="LineNr"> 92 </span> 53/push-EBX
<span id="L93" class="LineNr"> 93 </span> <span class="Comment"># write(1/stdout, (data) s+4, (size) *s)</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Comment"># fd = 1 (stdout)</span>
<span id="L95" class="LineNr"> 95 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy to EBX</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Comment"># x = s+4</span>
<span id="L97" class="LineNr"> 97 </span> 8b/copy 1/mod/*+disp8 4/rm32/SIB 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 1/r32/ECX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to ECX</span>
<span id="L98" class="LineNr"> 98 </span> 81 0/subop/add 3/mod/direct 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ECX</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Comment"># size = *s</span>
<span id="L100" class="LineNr">100 </span> 8b/copy 1/mod/*+disp8 4/rm32/SIB 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 2/r32/EDX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to EDX</span>
<span id="L101" class="LineNr">101 </span> 8b/copy 0/mod/indirect 2/rm32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *EDX to EDX</span>
<span id="L102" class="LineNr">102 </span> <span class="Comment"># call write()</span>
<span id="L103" class="LineNr">103 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32/write <span class="Comment"># copy to EAX</span>
<span id="L104" class="LineNr">104 </span> cd/syscall 0x80/imm8
<span id="L105" class="LineNr">105 </span> <span class="Comment"># restore registers</span>
<span id="L106" class="LineNr">106 </span> 5b/pop-to-EBX
<span id="L107" class="LineNr">107 </span> 5a/pop-to-EDX
<span id="L108" class="LineNr">108 </span> 59/pop-to-ECX
<span id="L109" class="LineNr">109 </span> 58/pop-to-EAX
<span id="L110" class="LineNr">110 </span> <span class="Comment"># end</span>
<span id="L111" class="LineNr">111 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L112" class="LineNr">112 </span> 5d/pop-to-EBP
<span id="L113" class="LineNr">113 </span> c3/return
<span id="L114" class="LineNr">114 </span>
<span id="L115" class="LineNr">115 </span><span class="Comment"># vim:ft=subx:nowrap:so=0</span>
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