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<a href='https://github.com/akkartik/mu/blob/main/315stack-debug.subx'>https://github.com/akkartik/mu/blob/main/315stack-debug.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># The stack shouldn't grow into the code area.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">check-stack</span>:
<span id="L6" class="LineNr"> 6 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L7" class="LineNr"> 7 </span> 55/push-ebp
<span id="L8" class="LineNr"> 8 </span> 89/<- %ebp 4/r32/esp
<span id="L9" class="LineNr"> 9 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L10" class="LineNr"> 10 </span> 50/push-eax
<span id="L11" class="LineNr"> 11 </span> <span class="subxComment">#</span>
<span id="L12" class="LineNr"> 12 </span> 89/<- %eax 4/r32/esp
<span id="L13" class="LineNr"> 13 </span> 3d/compare-eax-and 0x01000000/imm32
<span id="L14" class="LineNr"> 14 </span> {
<span id="L15" class="LineNr"> 15 </span> 7f/jump-if-> <span class="Constant">break</span>/disp8
<span id="L16" class="LineNr"> 16 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"stack overflow"</span>)
<span id="L17" class="LineNr"> 17 </span> }
<span id="L18" class="LineNr"> 18 </span><span class="Constant">$check-stack:end</span>:
<span id="L19" class="LineNr"> 19 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L20" class="LineNr"> 20 </span> 58/pop-to-eax
<span id="L21" class="LineNr"> 21 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L22" class="LineNr"> 22 </span> 89/<- %esp 5/r32/ebp
<span id="L23" class="LineNr"> 23 </span> 5d/pop-to-ebp
<span id="L24" class="LineNr"> 24 </span> c3/return
<span id="L25" class="LineNr"> 25 </span>
<span id="L26" class="LineNr"> 26 </span><span class="subxFunction">show-stack-state</span>:
<span id="L27" class="LineNr"> 27 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L28" class="LineNr"> 28 </span> 55/push-ebp
<span id="L29" class="LineNr"> 29 </span> 89/<- %ebp 4/r32/esp
<span id="L30" class="LineNr"> 30 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L31" class="LineNr"> 31 </span> 50/push-eax
<span id="L32" class="LineNr"> 32 </span> 51/push-ecx
<span id="L33" class="LineNr"> 33 </span> 52/push-edx
<span id="L34" class="LineNr"> 34 </span> <span class="subxComment">#</span>
<span id="L35" class="LineNr"> 35 </span> 89/<- %edx 4/r32/esp
<span id="L36" class="LineNr"> 36 </span> <span class="subxComment"># save old cursor position</span>
<span id="L37" class="LineNr"> 37 </span> (<a href='500fake-screen.mu.html#L253'>cursor-position</a> 0) <span class="subxComment"># => eax, ecx</span>
<span id="L38" class="LineNr"> 38 </span> <span class="subxComment"># print at top-right</span>
<span id="L39" class="LineNr"> 39 </span> (<a href='500fake-screen.mu.html#L269'>set-cursor-position</a> 0 0x70 0)
<span id="L40" class="LineNr"> 40 </span> (<a href='501draw-text.mu.html#L387'>draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen</a> 0 %edx 0xf 0xc)
<span id="L41" class="LineNr"> 41 </span> <span class="subxComment"># restore cursor position</span>
<span id="L42" class="LineNr"> 42 </span> (<a href='500fake-screen.mu.html#L269'>set-cursor-position</a> %eax %ecx)
<span id="L43" class="LineNr"> 43 </span><span class="Constant">$show-stack-state:end</span>:
<span id="L44" class="LineNr"> 44 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L45" class="LineNr"> 45 </span> 5a/pop-to-edx
<span id="L46" class="LineNr"> 46 </span> 59/pop-to-ecx
<span id="L47" class="LineNr"> 47 </span> 58/pop-to-eax
<span id="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L49" class="LineNr"> 49 </span> 89/<- %esp 5/r32/ebp
<span id="L50" class="LineNr"> 50 </span> 5d/pop-to-ebp
<span id="L51" class="LineNr"> 51 </span> c3/return
<span id="L52" class="LineNr"> 52 </span>
<span id="L53" class="LineNr"> 53 </span><span class="subxComment"># Helper for debugging deeply recursive calls without logs or traces.</span>
<span id="L54" class="LineNr"> 54 </span><span class="subxComment"># Turn it on, insert calls in the right places, and you get a terse sense of</span>
<span id="L55" class="LineNr"> 55 </span><span class="subxComment"># important parts of the call stack. A poor sophont's stack trace.</span>
<span id="L56" class="LineNr"> 56 </span><span class="subxFunction">debug-print</span>: <span class="subxComment"># x: (addr array byte), fg: int, bg: int # x is very short; usually a single character</span>
<span id="L57" class="LineNr"> 57 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L58" class="LineNr"> 58 </span> 55/push-ebp
<span id="L59" class="LineNr"> 59 </span> 89/<- %ebp 4/r32/esp
<span id="L60" class="LineNr"> 60 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L61" class="LineNr"> 61 </span> 50/push-eax
<span id="L62" class="LineNr"> 62 </span> 51/push-ecx
<span id="L63" class="LineNr"> 63 </span> <span class="subxComment">#</span>
<span id="L64" class="LineNr"> 64 </span> {
<span id="L65" class="LineNr"> 65 </span> 81 7/subop/compare *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/imm32/false
<span id="L66" class="LineNr"> 66 </span> 74/jump-if-= <span class="Constant">break</span>/disp8
<span id="L67" class="LineNr"> 67 </span> (<a href='501draw-text.mu.html#L332'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> 0 *(ebp+8) *(ebp+0xc) *(ebp+0x10))
<span id="L68" class="LineNr"> 68 </span> <span class="subxComment"># clear the screen and continue if we got too close to the bottom</span>
<span id="L69" class="LineNr"> 69 </span> (<a href='500fake-screen.mu.html#L253'>cursor-position</a> 0) <span class="subxComment"># => eax, ecx</span>
<span id="L70" class="LineNr"> 70 </span> 81 7/subop/compare %ecx 0x28/imm32
<span id="L71" class="LineNr"> 71 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8
<span id="L72" class="LineNr"> 72 </span> (<a href='500fake-screen.mu.html#L330'>clear-screen</a> 0)
<span id="L73" class="LineNr"> 73 </span> (<a href='500fake-screen.mu.html#L269'>set-cursor-position</a> 0 0 0)
<span id="L74" class="LineNr"> 74 </span> }
<span id="L75" class="LineNr"> 75 </span><span class="Constant">$debug-print:end</span>:
<span id="L76" class="LineNr"> 76 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L77" class="LineNr"> 77 </span> 59/pop-to-ecx
<span id="L78" class="LineNr"> 78 </span> 58/pop-to-eax
<span id="L79" class="LineNr"> 79 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L80" class="LineNr"> 80 </span> 89/<- %esp 5/r32/ebp
<span id="L81" class="LineNr"> 81 </span> 5d/pop-to-ebp
<span id="L82" class="LineNr"> 82 </span> c3/return
<span id="L83" class="LineNr"> 83 </span>
<span id="L84" class="LineNr"> 84 </span><span class="subxFunction">debug-print?</span>: <span class="subxComment"># -> _/eax: boolean</span>
<span id="L85" class="LineNr"> 85 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L86" class="LineNr"> 86 </span> 55/push-ebp
<span id="L87" class="LineNr"> 87 </span> 89/<- %ebp 4/r32/esp
<span id="L88" class="LineNr"> 88 </span> <span class="subxComment">#</span>
<span id="L89" class="LineNr"> 89 </span> 8b/-> *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/r32/eax
<span id="L90" class="LineNr"> 90 </span><span class="Constant">$debug-print?:end</span>:
<span id="L91" class="LineNr"> 91 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L92" class="LineNr"> 92 </span> 89/<- %esp 5/r32/ebp
<span id="L93" class="LineNr"> 93 </span> 5d/pop-to-ebp
<span id="L94" class="LineNr"> 94 </span> c3/return
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="subxFunction">turn-on-debug-print</span>:
<span id="L97" class="LineNr"> 97 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L98" class="LineNr"> 98 </span> 55/push-ebp
<span id="L99" class="LineNr"> 99 </span> 89/<- %ebp 4/r32/esp
<span id="L100" class="LineNr">100 </span> <span class="subxComment">#</span>
<span id="L101" class="LineNr">101 </span> c7 0/subop/copy *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 1/imm32/true
<span id="L102" class="LineNr">102 </span><span class="Constant">$turn-on-debug-print:end</span>:
<span id="L103" class="LineNr">103 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L104" class="LineNr">104 </span> 89/<- %esp 5/r32/ebp
<span id="L105" class="LineNr">105 </span> 5d/pop-to-ebp
<span id="L106" class="LineNr">106 </span> c3/return
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span><span class="subxFunction">turn-off-debug-print</span>:
<span id="L109" class="LineNr">109 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L110" class="LineNr">110 </span> 55/push-ebp
<span id="L111" class="LineNr">111 </span> 89/<- %ebp 4/r32/esp
<span id="L112" class="LineNr">112 </span> <span class="subxComment">#</span>
<span id="L113" class="LineNr">113 </span> c7 0/subop/copy *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/imm32/false
<span id="L114" class="LineNr">114 </span><span class="Constant">$turn-off-debug-print:end</span>:
<span id="L115" class="LineNr">115 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L116" class="LineNr">116 </span> 89/<- %esp 5/r32/ebp
<span id="L117" class="LineNr">117 </span> 5d/pop-to-ebp
<span id="L118" class="LineNr">118 </span> c3/return
<span id="L119" class="LineNr">119 </span>
<span id="L120" class="LineNr">120 </span>== data
<span id="L121" class="LineNr">121 </span><span class="SpecialChar">Really-debug-print</span>:
<span id="L122" class="LineNr">122 </span> 0/imm32/false
<span id="L123" class="LineNr">123 </span><span class="CommentedCode">#? 1/imm32/true</span>
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