diff options
| author | Kartik Agaram <vc@akkartik.com> | 2018-11-26 01:19:47 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-11-26 01:19:47 -0800 |
| commit | d1c9392a5461e0d33e226375a8f7986a97d2d66b (patch) | |
| tree | 494c19edbe1d1522344b56ced6aa7c040ad37406 /html/subx/059read-byte.subx.html | |
| parent | 7e00968c99f97e13be8f5269feaf7fd1d33ecd33 (diff) | |
| download | mu-d1c9392a5461e0d33e226375a8f7986a97d2d66b.tar.gz | |
4782
Diffstat (limited to 'html/subx/059read-byte.subx.html')
| -rw-r--r-- | html/subx/059read-byte.subx.html | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/html/subx/059read-byte.subx.html b/html/subx/059read-byte.subx.html new file mode 100644 index 00000000..070d5afb --- /dev/null +++ b/html/subx/059read-byte.subx.html @@ -0,0 +1,310 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<title>Mu - subx/059read-byte.subx</title> +<meta name="Generator" content="Vim/8.0"> +<meta name="plugin-version" content="vim7.4_v2"> +<meta name="syntax" content="none"> +<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal"> +<style type="text/css"> +<!-- +pre { font-family: monospace; color: #aaaaaa; background-color: #080808; } +body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; } +a { color:#eeeeee; text-decoration: none; } +a:hover { text-decoration: underline; } +* { font-size: 12pt; font-size: 1em; } +.CommentedCode { color: #6c6c6c; } +.LineNr { color: #444444; } +.Constant { color: #00a0a0; } +.Delimiter { color: #800080; } +.Special { color: #c00000; } +.Comment { color: #9090ff; } +.Comment a { color:#0000ee; text-decoration:underline; } +.SalientComment { color: #00ffff; } +--> +</style> + +<script type='text/javascript'> +<!-- + +/* function to open any folds containing a jumped-to line before jumping to it */ +function JumpToLine() +{ + var lineNum; + lineNum = window.location.hash; + lineNum = lineNum.substr(1); /* strip off '#' */ + + if (lineNum.indexOf('L') == -1) { + lineNum = 'L'+lineNum; + } + lineElem = document.getElementById(lineNum); + /* Always jump to new location even if the line was hidden inside a fold, or + * we corrected the raw number to a line ID. + */ + if (lineElem) { + lineElem.scrollIntoView(true); + } + return true; +} +if ('onhashchange' in window) { + window.onhashchange = JumpToLine; +} + +--> +</script> +</head> +<body onload='JumpToLine();'> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="Comment"># read-byte: one higher-level abstraction atop 'read'.</span> +<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span> +<span id="L3" class="LineNr"> 3 </span><span class="Comment"># There are many situations where 'read' is a lot to manage, and we need</span> +<span id="L4" class="LineNr"> 4 </span><span class="Comment"># to abstract some details away. One of them is when we want to read a file</span> +<span id="L5" class="LineNr"> 5 </span><span class="Comment"># character by character. In this situation we follow C's FILE data structure,</span> +<span id="L6" class="LineNr"> 6 </span><span class="Comment"># which manages the underlying file descriptor together with the buffer it</span> +<span id="L7" class="LineNr"> 7 </span><span class="Comment"># reads into. We call our version 'buffered-file'. Should be useful with other</span> +<span id="L8" class="LineNr"> 8 </span><span class="Comment"># primitives as well, in later layers.</span> +<span id="L9" class="LineNr"> 9 </span> +<span id="L10" class="LineNr"> 10 </span>== data +<span id="L11" class="LineNr"> 11 </span> +<span id="L12" class="LineNr"> 12 </span><span class="Comment"># The buffered file for standard input. Also illustrates the layout for</span> +<span id="L13" class="LineNr"> 13 </span><span class="Comment"># buffered-file.</span> +<span id="L14" class="LineNr"> 14 </span> +<span id="L15" class="LineNr"> 15 </span><span class="Special">Stdin</span>: +<span id="L16" class="LineNr"> 16 </span> <span class="Comment"># file descriptor or (address stream)</span> +<span id="L17" class="LineNr"> 17 </span> 00 00 00 00 <span class="Comment"># 0 = standard input</span> +<span id="L18" class="LineNr"> 18 </span> <span class="Comment"># current write index</span> +<span id="L19" class="LineNr"> 19 </span> 00 00 00 00 +<span id="L20" class="LineNr"> 20 </span> <span class="Comment"># current read index</span> +<span id="L21" class="LineNr"> 21 </span> 00 00 00 00 +<span id="L22" class="LineNr"> 22 </span> <span class="Comment"># length (8)</span> +<span id="L23" class="LineNr"> 23 </span> 08 00 00 00 +<span id="L24" class="LineNr"> 24 </span> <span class="Comment"># data</span> +<span id="L25" class="LineNr"> 25 </span> 00 00 00 00 00 00 00 00 <span class="Comment"># 8 bytes</span> +<span id="L26" class="LineNr"> 26 </span> +<span id="L27" class="LineNr"> 27 </span><span class="Comment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency.</span> +<span id="L28" class="LineNr"> 28 </span> +<span id="L29" class="LineNr"> 29 </span>== code +<span id="L30" class="LineNr"> 30 </span><span class="Comment"># instruction effective address operand displacement immediate</span> +<span id="L31" class="LineNr"> 31 </span><span class="Comment"># op subop mod rm32 base index scale r32</span> +<span id="L32" class="LineNr"> 32 </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="L33" class="LineNr"> 33 </span> +<span id="L34" class="LineNr"> 34 </span><span class="Comment"># main:</span> +<span id="L35" class="LineNr"> 35 </span> e8/call run-tests/disp32 <span class="Comment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span> +<span id="L36" class="LineNr"> 36 </span><span class="CommentedCode">#? e8/call test-read-byte-multiple/disp32</span> +<span id="L37" class="LineNr"> 37 </span> <span class="Comment"># syscall(exit, Num-test-failures)</span> +<span id="L38" class="LineNr"> 38 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/r32/EBX <span class="Special">Num-test-failures</span>/disp32 <span class="Comment"># copy *Num-test-failures to EBX</span> +<span id="L39" class="LineNr"> 39 </span> b8/copy-to-EAX 1/imm32 +<span id="L40" class="LineNr"> 40 </span> cd/syscall 0x80/imm8 +<span id="L41" class="LineNr"> 41 </span> +<span id="L42" class="LineNr"> 42 </span><span class="Comment"># return next byte value in EAX, with top 3 bytes cleared.</span> +<span id="L43" class="LineNr"> 43 </span><span class="Comment"># On EOF, return 0xffffffff.</span> +<span id="L44" class="LineNr"> 44 </span>read-byte: <span class="Comment"># f : (address buffered-file) -> byte/EAX</span> +<span id="L45" class="LineNr"> 45 </span> <span class="Comment"># prolog</span> +<span id="L46" class="LineNr"> 46 </span> 55/push-EBP +<span id="L47" class="LineNr"> 47 </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="L48" class="LineNr"> 48 </span> <span class="Comment"># save registers</span> +<span id="L49" class="LineNr"> 49 </span> 51/push-ECX +<span id="L50" class="LineNr"> 50 </span> 56/push-ESI +<span id="L51" class="LineNr"> 51 </span> <span class="Comment"># ESI = f</span> +<span id="L52" class="LineNr"> 52 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 6/r32/ESI 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to ESI</span> +<span id="L53" class="LineNr"> 53 </span> <span class="Comment"># ECX = f->read</span> +<span id="L54" class="LineNr"> 54 </span> 8b/copy 1/mod/*+disp8 6/rm32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/r32/ECX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESI+8) to ECX</span> +<span id="L55" class="LineNr"> 55 </span> <span class="SalientComment">## if (f->read < f->write) read byte from stream</span> +<span id="L56" class="LineNr"> 56 </span> 3b/compare 1/mod/*+disp8 6/rm32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/r32/ECX 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># compare ECX with *(ESI+4)</span> +<span id="L57" class="LineNr"> 57 </span> 7c/jump-if-lesser $read-byte:from-stream/disp8 +<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># clear-stream(stream = f+4)</span> +<span id="L59" class="LineNr"> 59 </span> <span class="Comment"># push args</span> +<span id="L60" class="LineNr"> 60 </span> 8d/copy-address 1/mod/*+disp8 6/rm32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy ESI+4 to EAX</span> +<span id="L61" class="LineNr"> 61 </span> 50/push-EAX +<span id="L62" class="LineNr"> 62 </span> <span class="Comment"># call</span> +<span id="L63" class="LineNr"> 63 </span> e8/call clear-stream/disp32 +<span id="L64" class="LineNr"> 64 </span> <span class="Comment"># discard args</span> +<span id="L65" class="LineNr"> 65 </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="L66" class="LineNr"> 66 </span> <span class="Comment"># EAX = read(f->fd, stream = f+4)</span> +<span id="L67" class="LineNr"> 67 </span> <span class="Comment"># push args</span> +<span id="L68" class="LineNr"> 68 </span> 50/push-EAX +<span id="L69" class="LineNr"> 69 </span> ff 6/subop/push 0/mod/indirect 6/rm32/ESI <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="Comment"># push *ESI</span> +<span id="L70" class="LineNr"> 70 </span> <span class="Comment"># call</span> +<span id="L71" class="LineNr"> 71 </span> e8/call read/disp32 +<span id="L72" class="LineNr"> 72 </span> <span class="Comment"># discard args</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> 8/imm32 <span class="Comment"># add to ESP</span> +<span id="L74" class="LineNr"> 74 </span> <span class="Comment"># if EAX = 0 return 0xffffffff</span> +<span id="L75" class="LineNr"> 75 </span> 81 7/subop/compare 3/mod/direct 0/rm32/EAX <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"># compare EAX</span> +<span id="L76" class="LineNr"> 76 </span> 75/jump-if-not-equal $read-byte:from-stream/disp8 +<span id="L77" class="LineNr"> 77 </span> b8/copy-to-EAX 0xffffffff/imm32 +<span id="L78" class="LineNr"> 78 </span> eb/jump $read-byte:end/disp8 +<span id="L79" class="LineNr"> 79 </span>$read-byte:from-stream: +<span id="L80" class="LineNr"> 80 </span> <span class="Comment"># AL = f->data[f->read]</span> +<span id="L81" class="LineNr"> 81 </span> 31/xor 3/mod/direct 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># clear EAX</span> +<span id="L82" class="LineNr"> 82 </span> 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/ESI 1/index/ECX <span class="Delimiter"> . </span> 0/r32/AL 0x10/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESI+ECX+16) to AL</span> +<span id="L83" class="LineNr"> 83 </span> <span class="Comment"># ++f->read</span> +<span id="L84" class="LineNr"> 84 </span> ff 0/subop/increment 1/mod/*+disp8 6/rm32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># increment *(ESI+8)</span> +<span id="L85" class="LineNr"> 85 </span>$read-byte:end: +<span id="L86" class="LineNr"> 86 </span> <span class="Comment"># restore registers</span> +<span id="L87" class="LineNr"> 87 </span> 5e/pop-to-ESI +<span id="L88" class="LineNr"> 88 </span> 59/pop-to-ECX +<span id="L89" class="LineNr"> 89 </span> <span class="Comment"># epilog</span> +<span id="L90" class="LineNr"> 90 </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="L91" class="LineNr"> 91 </span> 5d/pop-to-EBP +<span id="L92" class="LineNr"> 92 </span> c3/return +<span id="L93" class="LineNr"> 93 </span> +<span id="L94" class="LineNr"> 94 </span><span class="Comment"># todo: how should write-byte look? What should it do when the output has no</span> +<span id="L95" class="LineNr"> 95 </span><span class="Comment"># space remaining? Maybe return an error code.</span> +<span id="L96" class="LineNr"> 96 </span> +<span id="L97" class="LineNr"> 97 </span><span class="SalientComment">## tests</span> +<span id="L98" class="LineNr"> 98 </span> +<span id="L99" class="LineNr"> 99 </span>test-read-byte-single: +<span id="L100" class="LineNr">100 </span> <span class="SalientComment">## check that read-byte returns first byte of 'file'</span> +<span id="L101" class="LineNr">101 </span> <span class="Comment"># clear-stream(_test-stream)</span> +<span id="L102" class="LineNr">102 </span> <span class="Comment"># push args</span> +<span id="L103" class="LineNr">103 </span> 68/push _test-stream/imm32 +<span id="L104" class="LineNr">104 </span> <span class="Comment"># call</span> +<span id="L105" class="LineNr">105 </span> e8/call clear-stream/disp32 +<span id="L106" class="LineNr">106 </span> <span class="Comment"># discard args</span> +<span id="L107" class="LineNr">107 </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="L108" class="LineNr">108 </span> <span class="Comment"># clear-stream(_test-buffered-file+4)</span> +<span id="L109" class="LineNr">109 </span> <span class="Comment"># push args</span> +<span id="L110" class="LineNr">110 </span> b8/copy-to-EAX _test-buffered-file/imm32 +<span id="L111" class="LineNr">111 </span> 05/add-to-EAX 4/imm32 +<span id="L112" class="LineNr">112 </span> 50/push-EAX +<span id="L113" class="LineNr">113 </span> <span class="Comment"># call</span> +<span id="L114" class="LineNr">114 </span> e8/call clear-stream/disp32 +<span id="L115" class="LineNr">115 </span> <span class="Comment"># discard args</span> +<span id="L116" class="LineNr">116 </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="L117" class="LineNr">117 </span> <span class="Comment"># write(_test-stream, "Ab")</span> +<span id="L118" class="LineNr">118 </span> <span class="Comment"># push args</span> +<span id="L119" class="LineNr">119 </span> 68/push <span class="Constant">"Ab"</span>/imm32 +<span id="L120" class="LineNr">120 </span> 68/push _test-stream/imm32 +<span id="L121" class="LineNr">121 </span> <span class="Comment"># call</span> +<span id="L122" class="LineNr">122 </span> e8/call write/disp32 +<span id="L123" class="LineNr">123 </span> <span class="Comment"># discard args</span> +<span id="L124" class="LineNr">124 </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> 8/imm32 <span class="Comment"># add to ESP</span> +<span id="L125" class="LineNr">125 </span> <span class="Comment"># read-byte(_test-buffered-file)</span> +<span id="L126" class="LineNr">126 </span> <span class="Comment"># push args</span> +<span id="L127" class="LineNr">127 </span> 68/push _test-buffered-file/imm32 +<span id="L128" class="LineNr">128 </span> <span class="Comment"># call</span> +<span id="L129" class="LineNr">129 </span> e8/call read-byte/disp32 +<span id="L130" class="LineNr">130 </span> <span class="Comment"># discard args</span> +<span id="L131" class="LineNr">131 </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="L132" class="LineNr">132 </span> <span class="Comment"># check-ints-equal(EAX, 'A')</span> +<span id="L133" class="LineNr">133 </span> <span class="Comment"># push args</span> +<span id="L134" class="LineNr">134 </span> 68/push <span class="Constant">"F - test-read-byte-single"</span>/imm32 +<span id="L135" class="LineNr">135 </span> 68/push 0x41/imm32 +<span id="L136" class="LineNr">136 </span> 50/push-EAX +<span id="L137" class="LineNr">137 </span> <span class="Comment"># call</span> +<span id="L138" class="LineNr">138 </span> e8/call check-ints-equal/disp32 +<span id="L139" class="LineNr">139 </span> <span class="Comment"># discard args</span> +<span id="L140" class="LineNr">140 </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> 0xc/imm32 <span class="Comment"># add to ESP</span> +<span id="L141" class="LineNr">141 </span> <span class="Comment"># end</span> +<span id="L142" class="LineNr">142 </span> c3/return +<span id="L143" class="LineNr">143 </span> +<span id="L144" class="LineNr">144 </span>test-read-byte-multiple: +<span id="L145" class="LineNr">145 </span> <span class="SalientComment">## call read-byte twice, check that second call returns second byte</span> +<span id="L146" class="LineNr">146 </span> <span class="Comment"># clear-stream(_test-stream)</span> +<span id="L147" class="LineNr">147 </span> <span class="Comment"># push args</span> +<span id="L148" class="LineNr">148 </span> 68/push _test-stream/imm32 +<span id="L149" class="LineNr">149 </span> <span class="Comment"># call</span> +<span id="L150" class="LineNr">150 </span> e8/call clear-stream/disp32 +<span id="L151" class="LineNr">151 </span> <span class="Comment"># discard args</span> +<span id="L152" class="LineNr">152 </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="L153" class="LineNr">153 </span> <span class="Comment"># clear-stream(_test-buffered-file+4)</span> +<span id="L154" class="LineNr">154 </span> <span class="Comment"># push args</span> +<span id="L155" class="LineNr">155 </span> b8/copy-to-EAX _test-buffered-file/imm32 +<span id="L156" class="LineNr">156 </span> 05/add-to-EAX 4/imm32 +<span id="L157" class="LineNr">157 </span> 50/push-EAX +<span id="L158" class="LineNr">158 </span> <span class="Comment"># call</span> +<span id="L159" class="LineNr">159 </span> e8/call clear-stream/disp32 +<span id="L160" class="LineNr">160 </span> <span class="Comment"># discard args</span> +<span id="L161" class="LineNr">161 </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="L162" class="LineNr">162 </span> <span class="Comment"># write(_test-stream, "Ab")</span> +<span id="L163" class="LineNr">163 </span> <span class="Comment"># push args</span> +<span id="L164" class="LineNr">164 </span> 68/push <span class="Constant">"Ab"</span>/imm32 +<span id="L165" class="LineNr">165 </span> 68/push _test-stream/imm32 +<span id="L166" class="LineNr">166 </span> <span class="Comment"># call</span> +<span id="L167" class="LineNr">167 </span> e8/call write/disp32 +<span id="L168" class="LineNr">168 </span> <span class="Comment"># discard args</span> +<span id="L169" class="LineNr">169 </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> 8/imm32 <span class="Comment"># add to ESP</span> +<span id="L170" class="LineNr">170 </span> <span class="Comment"># read-byte(_test-buffered-file)</span> +<span id="L171" class="LineNr">171 </span> <span class="Comment"># push args</span> +<span id="L172" class="LineNr">172 </span> 68/push _test-buffered-file/imm32 +<span id="L173" class="LineNr">173 </span> <span class="Comment"># call</span> +<span id="L174" class="LineNr">174 </span> e8/call read-byte/disp32 +<span id="L175" class="LineNr">175 </span> <span class="Comment"># discard args</span> +<span id="L176" class="LineNr">176 </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="L177" class="LineNr">177 </span> <span class="Comment"># read-byte(_test-buffered-file)</span> +<span id="L178" class="LineNr">178 </span> <span class="Comment"># push args</span> +<span id="L179" class="LineNr">179 </span> 68/push _test-buffered-file/imm32 +<span id="L180" class="LineNr">180 </span> <span class="Comment"># call</span> +<span id="L181" class="LineNr">181 </span> e8/call read-byte/disp32 +<span id="L182" class="LineNr">182 </span> <span class="Comment"># discard args</span> +<span id="L183" class="LineNr">183 </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="L184" class="LineNr">184 </span> <span class="Comment"># check-ints-equal(EAX, 'b')</span> +<span id="L185" class="LineNr">185 </span> <span class="Comment"># push args</span> +<span id="L186" class="LineNr">186 </span> 68/push <span class="Constant">"F - test-read-byte-multiple"</span>/imm32 +<span id="L187" class="LineNr">187 </span> 68/push 0x62/imm32 +<span id="L188" class="LineNr">188 </span> 50/push-EAX +<span id="L189" class="LineNr">189 </span> <span class="Comment"># call</span> +<span id="L190" class="LineNr">190 </span> e8/call check-ints-equal/disp32 +<span id="L191" class="LineNr">191 </span> <span class="Comment"># discard args</span> +<span id="L192" class="LineNr">192 </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> 0xc/imm32 <span class="Comment"># add to ESP</span> +<span id="L193" class="LineNr">193 </span> <span class="Comment"># end</span> +<span id="L194" class="LineNr">194 </span> c3/return +<span id="L195" class="LineNr">195 </span> +<span id="L196" class="LineNr">196 </span>test-read-byte-end-of-file: +<span id="L197" class="LineNr">197 </span> <span class="SalientComment">## call read-byte on an empty 'file', check that it returns -1</span> +<span id="L198" class="LineNr">198 </span> <span class="Comment"># clear-stream(_test-stream)</span> +<span id="L199" class="LineNr">199 </span> <span class="Comment"># push args</span> +<span id="L200" class="LineNr">200 </span> 68/push _test-stream/imm32 +<span id="L201" class="LineNr">201 </span> <span class="Comment"># call</span> +<span id="L202" class="LineNr">202 </span> e8/call clear-stream/disp32 +<span id="L203" class="LineNr">203 </span> <span class="Comment"># discard args</span> +<span id="L204" class="LineNr">204 </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="L205" class="LineNr">205 </span> <span class="Comment"># clear-stream(_test-buffered-file+4)</span> +<span id="L206" class="LineNr">206 </span> <span class="Comment"># push args</span> +<span id="L207" class="LineNr">207 </span> b8/copy-to-EAX _test-buffered-file/imm32 +<span id="L208" class="LineNr">208 </span> 05/add-to-EAX 4/imm32 +<span id="L209" class="LineNr">209 </span> 50/push-EAX +<span id="L210" class="LineNr">210 </span> <span class="Comment"># call</span> +<span id="L211" class="LineNr">211 </span> e8/call clear-stream/disp32 +<span id="L212" class="LineNr">212 </span> <span class="Comment"># discard args</span> +<span id="L213" class="LineNr">213 </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="L214" class="LineNr">214 </span> <span class="Comment"># read-byte(_test-buffered-file)</span> +<span id="L215" class="LineNr">215 </span> <span class="Comment"># push args</span> +<span id="L216" class="LineNr">216 </span> 68/push _test-buffered-file/imm32 +<span id="L217" class="LineNr">217 </span> <span class="Comment"># call</span> +<span id="L218" class="LineNr">218 </span> e8/call read-byte/disp32 +<span id="L219" class="LineNr">219 </span> <span class="Comment"># discard args</span> +<span id="L220" class="LineNr">220 </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="L221" class="LineNr">221 </span> <span class="Comment"># check-ints-equal(EAX, -1)</span> +<span id="L222" class="LineNr">222 </span> <span class="Comment"># push args</span> +<span id="L223" class="LineNr">223 </span> 68/push <span class="Constant">"F - test-read-byte-end-of-file"</span>/imm32 +<span id="L224" class="LineNr">224 </span> 68/push -1/imm32 +<span id="L225" class="LineNr">225 </span> 50/push-EAX +<span id="L226" class="LineNr">226 </span> <span class="Comment"># call</span> +<span id="L227" class="LineNr">227 </span> e8/call check-ints-equal/disp32 +<span id="L228" class="LineNr">228 </span> <span class="Comment"># discard args</span> +<span id="L229" class="LineNr">229 </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> 0xc/imm32 <span class="Comment"># add to ESP</span> +<span id="L230" class="LineNr">230 </span> <span class="Comment"># end</span> +<span id="L231" class="LineNr">231 </span> c3/return +<span id="L232" class="LineNr">232 </span> +<span id="L233" class="LineNr">233 </span>== data +<span id="L234" class="LineNr">234 </span> +<span id="L235" class="LineNr">235 </span>_test-buffered-file: +<span id="L236" class="LineNr">236 </span> <span class="Comment"># file descriptor or (address stream)</span> +<span id="L237" class="LineNr">237 </span> _test-stream/imm32 +<span id="L238" class="LineNr">238 </span> <span class="Comment"># current write index</span> +<span id="L239" class="LineNr">239 </span> 00 00 00 00 +<span id="L240" class="LineNr">240 </span> <span class="Comment"># current read index</span> +<span id="L241" class="LineNr">241 </span> 00 00 00 00 +<span id="L242" class="LineNr">242 </span> <span class="Comment"># length (8)</span> +<span id="L243" class="LineNr">243 </span> 08 00 00 00 +<span id="L244" class="LineNr">244 </span> <span class="Comment"># data</span> +<span id="L245" class="LineNr">245 </span> 00 00 00 00 00 00 00 00 <span class="Comment"># 8 bytes</span> +<span id="L246" class="LineNr">246 </span> +<span id="L247" class="LineNr">247 </span><span class="Comment"># vim:nowrap:textwidth=0</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |