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authorKartik Agaram <vc@akkartik.com>2018-12-03 17:08:04 -0800
committerKartik Agaram <vc@akkartik.com>2018-12-03 17:08:53 -0800
commit83822d63240cc4d03d00133719993f5e4b2c281f (patch)
tree31022cc8672e79670030aa279109bf6bc9b387ba /html/subx/062write-byte.subx.html
parent5e27c7f13e6a888484ccf144579ed2d3b676da89 (diff)
downloadmu-83822d63240cc4d03d00133719993f5e4b2c281f.tar.gz
4828 - writing to buffered-file
This is likely a sub-optimal interface, but I'm trying not to agonize.
The whole point of Mu is to permit radical changes at any point in time.
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="subxComment"># write-byte: write a single byte to a buffered-file. The write may be buffered.</span>
+<span id="L2" class="LineNr">  2 </span><span class="subxComment"># flush: write out any buffered writes to disk.</span>
+<span id="L3" class="LineNr">  3 </span><span class="subxComment">#</span>
+<span id="L4" class="LineNr">  4 </span><span class="subxComment"># TODO: Come up with a way to signal failure to write to disk. This is hard</span>
+<span id="L5" class="LineNr">  5 </span><span class="subxComment"># since the failure may impact previous calls that were buffered.</span>
+<span id="L6" class="LineNr">  6 </span>
+<span id="L7" class="LineNr">  7 </span>== data
+<span id="L8" class="LineNr">  8 </span>
+<span id="L9" class="LineNr">  9 </span><span class="subxComment"># The buffered file for standard output.</span>
+<span id="L10" class="LineNr"> 10 </span>
+<span id="L11" class="LineNr"> 11 </span><span class="SpecialChar">Stdout</span>:
+<span id="L12" class="LineNr"> 12 </span>    <span class="subxComment"># file descriptor or (address stream)</span>
+<span id="L13" class="LineNr"> 13 </span>    01 00 00 00  <span class="subxComment"># 1 = standard output</span>
+<span id="L14" class="LineNr"> 14 </span>    <span class="subxComment"># current write index</span>
+<span id="L15" class="LineNr"> 15 </span>    00 00 00 00
+<span id="L16" class="LineNr"> 16 </span>    <span class="subxComment"># current read index</span>
+<span id="L17" class="LineNr"> 17 </span>    00 00 00 00
+<span id="L18" class="LineNr"> 18 </span>    <span class="subxComment"># length (8)</span>
+<span id="L19" class="LineNr"> 19 </span>    08 00 00 00
+<span id="L20" class="LineNr"> 20 </span>    <span class="subxComment"># data</span>
+<span id="L21" class="LineNr"> 21 </span>    00 00 00 00 00 00 00 00  <span class="subxComment"># 8 bytes</span>
+<span id="L22" class="LineNr"> 22 </span>
+<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But</span>
+<span id="L24" class="LineNr"> 24 </span><span class="subxComment"># I don't want to type 1024 bytes here.</span>
+<span id="L25" class="LineNr"> 25 </span>
+<span id="L26" class="LineNr"> 26 </span>== code
+<span id="L27" class="LineNr"> 27 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L28" class="LineNr"> 28 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L29" class="LineNr"> 29 </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="L30" class="LineNr"> 30 </span>
+<span id="L31" class="LineNr"> 31 </span><span class="subxComment"># main:</span>
+<span id="L32" class="LineNr"> 32 </span>    e8/call  run-tests/disp32  <span class="subxComment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
+<span id="L33" class="LineNr"> 33 </span>    <span class="subxComment"># syscall(exit, Num-test-failures)</span>
+<span id="L34" class="LineNr"> 34 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          3/r32/EBX   <span class="SpecialChar">Num-test-failures</span>/disp32          <span class="subxComment"># copy *Num-test-failures to EBX</span>
+<span id="L35" class="LineNr"> 35 </span>    b8/copy-to-EAX  1/imm32
+<span id="L36" class="LineNr"> 36 </span>    cd/syscall  0x80/imm8
+<span id="L37" class="LineNr"> 37 </span>
+<span id="L38" class="LineNr"> 38 </span><span class="subxComment"># Write lower byte of 'n' to 'f'.</span>
+<span id="L39" class="LineNr"> 39 </span><span class="subxFunction">write-byte</span>:  <span class="subxComment"># f : (address buffered-file), n : num -&gt; &lt;void&gt;</span>
+<span id="L40" class="LineNr"> 40 </span>    <span class="subxS1Comment"># . prolog</span>
+<span id="L41" class="LineNr"> 41 </span>    55/push-EBP
+<span id="L42" class="LineNr"> 42 </span>    89/copy                         3/mod/direct    5/rm32/EBP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
+<span id="L43" class="LineNr"> 43 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L44" class="LineNr"> 44 </span>    51/push-ECX
+<span id="L45" class="LineNr"> 45 </span>    56/push-ESI
+<span id="L46" class="LineNr"> 46 </span>    <span class="subxComment"># ESI = f</span>
+<span id="L47" class="LineNr"> 47 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          6/r32/ESI   8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+8) to ESI</span>
+<span id="L48" class="LineNr"> 48 </span>    <span class="subxComment"># ECX = f-&gt;write</span>
+<span id="L49" class="LineNr"> 49 </span>    8b/copy                         1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          1/r32/ECX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(ESI+4) to ECX</span>
+<span id="L50" class="LineNr"> 50 </span>    <span class="subxComment"># if (f-&gt;write &gt;= f-&gt;length) flush and clear stream</span>
+<span id="L51" class="LineNr"> 51 </span>    3b/compare                      1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          1/r32/ECX   0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># compare ECX with *(ESI+12)</span>
+<span id="L52" class="LineNr"> 52 </span>    7c/jump-if-lesser  $write-byte:to-stream/disp8
+<span id="L53" class="LineNr"> 53 </span>    <span class="subxS1Comment"># . flush-buffered-file(f)</span>
+<span id="L54" class="LineNr"> 54 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L55" class="LineNr"> 55 </span>    56/push-ESI
+<span id="L56" class="LineNr"> 56 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L57" class="LineNr"> 57 </span>    e8/call  flush/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="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L60" class="LineNr"> 60 </span>    <span class="subxS1Comment"># . clear-stream(stream = f+4)</span>
+<span id="L61" class="LineNr"> 61 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L62" class="LineNr"> 62 </span>    8d/copy-address                 1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESI+4 to EAX</span>
+<span id="L63" class="LineNr"> 63 </span>    50/push-EAX
+<span id="L64" class="LineNr"> 64 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L65" class="LineNr"> 65 </span>    e8/call  clear-stream/disp32
+<span id="L66" class="LineNr"> 66 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L67" class="LineNr"> 67 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L68" class="LineNr"> 68 </span><span class="Constant">$write-byte:to-stream</span>:
+<span id="L69" class="LineNr"> 69 </span>    <span class="subxComment"># write to stream</span>
+<span id="L70" class="LineNr"> 70 </span>    <span class="subxComment"># f-&gt;data[f-&gt;read] = LSB(n)</span>
+<span id="L71" class="LineNr"> 71 </span>    31/xor                          3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># clear EAX</span>
+<span id="L72" class="LineNr"> 72 </span>    8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          0/r32/AL    0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># copy byte at *(EBP+12) to AL</span>
+<span id="L73" class="LineNr"> 73 </span>    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/ESI  1/index/ECX  <span class="CommentedCode"> . </span>          0/r32/AL    0x10/disp8     <span class="CommentedCode"> . </span>                <span class="subxComment"># copy AL to *(ESI+ECX+16)</span>
+<span id="L74" class="LineNr"> 74 </span>    <span class="subxComment"># ++f-&gt;read</span>
+<span id="L75" class="LineNr"> 75 </span>    ff          0/subop/increment   1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># increment *(ESI+4)</span>
+<span id="L76" class="LineNr"> 76 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L77" class="LineNr"> 77 </span>    5e/pop-to-ESI
+<span id="L78" class="LineNr"> 78 </span>    59/pop-to-ECX
+<span id="L79" class="LineNr"> 79 </span>    <span class="subxS1Comment"># . epilog</span>
+<span id="L80" class="LineNr"> 80 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
+<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">flush</span>:  <span class="subxComment"># f : (address buffered-file) -&gt; &lt;void&gt;</span>
+<span id="L85" class="LineNr"> 85 </span>    <span class="subxS1Comment"># . 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="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
+<span id="L88" class="LineNr"> 88 </span>    <span class="subxS1Comment"># . 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>    <span class="subxComment"># EAX = f</span>
+<span id="L92" class="LineNr"> 92 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          0/r32/EAX   8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+8) to EAX</span>
+<span id="L93" class="LineNr"> 93 </span>    <span class="subxComment"># write-stream(f-&gt;fd, data = f+4)</span>
+<span id="L94" class="LineNr"> 94 </span>      <span class="subxS2Comment"># . . push args</span>
+<span id="L95" class="LineNr"> 95 </span>    8d/copy-address                 1/mod/*+disp8   0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          1/r32/ECX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EAX+4 to ECX</span>
+<span id="L96" class="LineNr"> 96 </span>    51/push-ECX
+<span id="L97" class="LineNr"> 97 </span>    ff          6/subop/push        0/mod/indirect  0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># push *EAX</span>
+<span id="L98" class="LineNr"> 98 </span>      <span class="subxS2Comment"># . . call</span>
+<span id="L99" class="LineNr"> 99 </span>    e8/call  write-stream/disp32
+<span id="L100" class="LineNr">100 </span>      <span class="subxS2Comment"># . . discard args</span>
+<span id="L101" class="LineNr">101 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L102" class="LineNr">102 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L103" class="LineNr">103 </span>    59/pop-to-ECX
+<span id="L104" class="LineNr">104 </span>    58/pop-to-EAX
+<span id="L105" class="LineNr">105 </span>    <span class="subxS1Comment"># . epilog</span>
+<span id="L106" class="LineNr">106 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
+<span id="L107" class="LineNr">107 </span>    5d/pop-to-EBP
+<span id="L108" class="LineNr">108 </span>    c3/return
+<span id="L109" class="LineNr">109 </span>
+<span id="L110" class="LineNr">110 </span><span class="subxH1Comment"># - tests</span>
+<span id="L111" class="LineNr">111 </span>
+<span id="L112" class="LineNr">112 </span><span class="subxTest">test-write-byte-single</span>:
+<span id="L113" class="LineNr">113 </span>    <span class="subxH1Comment"># - check that read-byte returns first byte of 'file'</span>
+<span id="L114" class="LineNr">114 </span>    <span class="subxComment"># setup</span>
+<span id="L115" class="LineNr">115 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
+<span id="L116" class="LineNr">116 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L117" class="LineNr">117 </span>    68/push  _test-stream/imm32
+<span id="L118" class="LineNr">118 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L119" class="LineNr">119 </span>    e8/call  clear-stream/disp32
+<span id="L120" class="LineNr">120 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L121" class="LineNr">121 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L122" class="LineNr">122 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
+<span id="L123" class="LineNr">123 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L124" class="LineNr">124 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L125" class="LineNr">125 </span>    05/add-to-EAX  4/imm32
+<span id="L126" class="LineNr">126 </span>    50/push-EAX
+<span id="L127" class="LineNr">127 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L128" class="LineNr">128 </span>    e8/call  clear-stream/disp32
+<span id="L129" class="LineNr">129 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L130" class="LineNr">130 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L131" class="LineNr">131 </span>    <span class="subxComment"># write-byte(_test-buffered-file, 'A')</span>
+<span id="L132" class="LineNr">132 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L133" class="LineNr">133 </span>    68/push  0x41/imm32
+<span id="L134" class="LineNr">134 </span>    68/push  _test-buffered-file/imm32
+<span id="L135" class="LineNr">135 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L136" class="LineNr">136 </span>    e8/call  write-byte/disp32
+<span id="L137" class="LineNr">137 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L138" class="LineNr">138 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L139" class="LineNr">139 </span>    <span class="subxComment"># flush(_test-buffered-file)</span>
+<span id="L140" class="LineNr">140 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L141" class="LineNr">141 </span>    68/push  _test-buffered-file/imm32
+<span id="L142" class="LineNr">142 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L143" class="LineNr">143 </span>    e8/call  flush/disp32
+<span id="L144" class="LineNr">144 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L145" class="LineNr">145 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L146" class="LineNr">146 </span>    <span class="subxComment"># check-ints-equal(*_test-stream-&gt;data, 'A', msg)</span>
+<span id="L147" class="LineNr">147 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L148" class="LineNr">148 </span>    68/push  <span class="Constant">&quot;F - test-write-byte-single&quot;</span>/imm32
+<span id="L149" class="LineNr">149 </span>    68/push  0x41/imm32
+<span id="L150" class="LineNr">150 </span>    <span class="subxS2Comment"># . . push *_test-stream-&gt;data</span>
+<span id="L151" class="LineNr">151 </span>    b8/copy-to-EAX  _test-stream/imm32
+<span id="L152" class="LineNr">152 </span>    ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EAX+12)</span>
+<span id="L153" class="LineNr">153 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L154" class="LineNr">154 </span>    e8/call  check-ints-equal/disp32
+<span id="L155" class="LineNr">155 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L156" class="LineNr">156 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xc/imm32         <span class="subxComment"># add to ESP</span>
+<span id="L157" class="LineNr">157 </span>    <span class="subxS1Comment"># . end</span>
+<span id="L158" class="LineNr">158 </span>    c3/return
+<span id="L159" class="LineNr">159 </span>
+<span id="L160" class="LineNr">160 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->