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authorKartik Agaram <vc@akkartik.com>2020-09-11 00:59:56 -0700
committerKartik Agaram <vc@akkartik.com>2020-09-11 00:59:56 -0700
commit91a5f3e10300fd84db26690095329592de0942d7 (patch)
tree892f8d2f339f834ff6a8269e1fe098750c99090d /html/306files.subx.html
parent3a4be20aba860bb62db3271b8e157bcc807514b0 (diff)
downloadmu-91a5f3e10300fd84db26690095329592de0942d7.tar.gz
6774
Diffstat (limited to 'html/306files.subx.html')
-rw-r--r--html/306files.subx.html216
1 files changed, 153 insertions, 63 deletions
diff --git a/html/306files.subx.html b/html/306files.subx.html
index 02841f28..8b376ea8 100644
--- a/html/306files.subx.html
+++ b/html/306files.subx.html
@@ -55,69 +55,159 @@ if ('onhashchange' in window) {
 <body onload='JumpToLine();'>
 <a href='https://github.com/akkartik/mu/blob/master/306files.subx'>https://github.com/akkartik/mu/blob/master/306files.subx</a>
 <pre id='vimCodeElement'>
-<span id="L1" class="LineNr"> 1 </span>== code
-<span id="L2" class="LineNr"> 2 </span>
-<span id="L3" class="LineNr"> 3 </span><span class="subxFunction">open</span>:  <span class="subxComment"># filename: (addr array byte), write?: boolean, out: (addr handle buffered-file)</span>
-<span id="L4" class="LineNr"> 4 </span>    <span class="subxComment"># hard-coded parameter: file-buffer-size of created buffered-file</span>
-<span id="L5" class="LineNr"> 5 </span>    <span class="subxS1Comment"># . prologue</span>
-<span id="L6" class="LineNr"> 6 </span>    55/push-ebp
-<span id="L7" class="LineNr"> 7 </span>    89/&lt;- %ebp 4/r32/esp
-<span id="L8" class="LineNr"> 8 </span>    <span class="subxS1Comment"># . save registers</span>
-<span id="L9" class="LineNr"> 9 </span>    50/push-eax
-<span id="L10" class="LineNr">10 </span>    51/push-ecx
-<span id="L11" class="LineNr">11 </span>    52/push-edx
-<span id="L12" class="LineNr">12 </span>    53/push-ebx
-<span id="L13" class="LineNr">13 </span>    56/push-esi
-<span id="L14" class="LineNr">14 </span>    57/push-edi
-<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># ecx = filename</span>
-<span id="L16" class="LineNr">16 </span>    8b/-&gt; *(ebp+8) 1/r32/ecx
-<span id="L17" class="LineNr">17 </span>    <span class="subxComment"># var size/edx: int = filename-&gt;length + 1 for the trailing null character</span>
-<span id="L18" class="LineNr">18 </span>    8b/-&gt; *ecx 2/r32/edx
-<span id="L19" class="LineNr">19 </span>    42/increment-edx
-<span id="L20" class="LineNr">20 </span>    <span class="subxComment"># var s/esi: (stream size)</span>
-<span id="L21" class="LineNr">21 </span>    29/subtract-from %esp 2/r32/edx
-<span id="L22" class="LineNr">22 </span>    52/push-edx  <span class="subxComment"># size</span>
-<span id="L23" class="LineNr">23 </span>    68/push 0/imm32/read
-<span id="L24" class="LineNr">24 </span>    68/push 0/imm32/write
-<span id="L25" class="LineNr">25 </span>    89/&lt;- %esi 4/r32/esp
-<span id="L26" class="LineNr">26 </span>    <span class="subxComment"># copy filename and a final null character</span>
-<span id="L27" class="LineNr">27 </span>    (<a href='106stream.subx.html#L17'>clear-stream</a> %esi)
-<span id="L28" class="LineNr">28 </span>    (<a href='108write.subx.html#L24'>write</a> %esi %ecx)
-<span id="L29" class="LineNr">29 </span>    <span class="subxComment"># spill edx</span>
-<span id="L30" class="LineNr">30 </span>    52/push-edx
-<span id="L31" class="LineNr">31 </span>    <span class="subxComment"># var fd/ecx: fd = open(filename)</span>
-<span id="L32" class="LineNr">32 </span>    8d/copy-address *(esi+0xc) 3/r32/ebx
-<span id="L33" class="LineNr">33 </span>    8b/-&gt; *(ebp+0xc) 1/r32/ecx/flags
-<span id="L34" class="LineNr">34 </span>    ba/copy-to-edx 0x180/imm32/permissions
-<span id="L35" class="LineNr">35 </span>    e8/call syscall_open/disp32
-<span id="L36" class="LineNr">36 </span>    89/&lt;- %ecx 0/r32/eax
-<span id="L37" class="LineNr">37 </span>    <span class="subxComment"># restore edx</span>
-<span id="L38" class="LineNr">38 </span>    5a/pop-to-edx
-<span id="L39" class="LineNr">39 </span>    <span class="subxComment"># allocate a buffered-file</span>
-<span id="L40" class="LineNr">40 </span>    (<a href='120allocate.subx.html#L66'>allocate</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> 0x1010 *(ebp+0x10))  <span class="subxComment"># file-buffer-size + 16 for other fields</span>
-<span id="L41" class="LineNr">41 </span>    <span class="subxComment"># var out-addr/edi: (addr buffered-file)</span>
-<span id="L42" class="LineNr">42 </span>    8b/-&gt; *(ebp+0x10) 7/r32/edi
-<span id="L43" class="LineNr">43 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *edi *(edi+4))  <span class="subxComment"># =&gt; eax</span>
-<span id="L44" class="LineNr">44 </span>    89/&lt;- %edi 0/r32/eax
-<span id="L45" class="LineNr">45 </span>    <span class="subxComment"># out-addr-&gt;size = 4KB</span>
-<span id="L46" class="LineNr">46 </span>    c7 0/subop/copy *(edi+0xc) 0x1000/imm32/file-buffer-size  <span class="subxComment"># Stream-size + 4 for fd</span>
-<span id="L47" class="LineNr">47 </span>    <span class="subxComment"># out-addr-&gt;fd = fd</span>
-<span id="L48" class="LineNr">48 </span>    89/&lt;- *edi 1/r32/ecx
-<span id="L49" class="LineNr">49 </span><span class="Constant">$open:end</span>:
-<span id="L50" class="LineNr">50 </span>    <span class="subxS1Comment"># . reclaim locals</span>
-<span id="L51" class="LineNr">51 </span>    01/add-to %esp 2/r32/edx
-<span id="L52" class="LineNr">52 </span>    81 0/subop/add %esp 0xc/imm32
-<span id="L53" class="LineNr">53 </span>    <span class="subxS1Comment"># . restore registers</span>
-<span id="L54" class="LineNr">54 </span>    5f/pop-to-edi
-<span id="L55" class="LineNr">55 </span>    5e/pop-to-esi
-<span id="L56" class="LineNr">56 </span>    5b/pop-to-ebx
-<span id="L57" class="LineNr">57 </span>    5a/pop-to-edx
-<span id="L58" class="LineNr">58 </span>    59/pop-to-ecx
-<span id="L59" class="LineNr">59 </span>    58/pop-to-eax
-<span id="L60" class="LineNr">60 </span>    <span class="subxS1Comment"># . epilogue</span>
-<span id="L61" class="LineNr">61 </span>    89/&lt;- %esp 5/r32/ebp
-<span id="L62" class="LineNr">62 </span>    5d/pop-to-ebp
-<span id="L63" class="LineNr">63 </span>    c3/return
+<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Methods for constructing buffered-file objects.</span>
+<span id="L2" class="LineNr">  2 </span><span class="subxComment">#</span>
+<span id="L3" class="LineNr">  3 </span><span class="subxComment"># TODO: There are hard-coded parameters here for buffer sizes. When they</span>
+<span id="L4" class="LineNr">  4 </span><span class="subxComment"># overflow, tracking down what's going on can get hairy.</span>
+<span id="L5" class="LineNr">  5 </span><span class="subxComment">#</span>
+<span id="L6" class="LineNr">  6 </span><span class="subxComment"># HACK: buffered-file stores naked addrs. This is safe because buffered-file</span>
+<span id="L7" class="LineNr">  7 </span><span class="subxComment"># objects are opaque. But still sub-optimal; they'll be harder to reclaim when</span>
+<span id="L8" class="LineNr">  8 </span><span class="subxComment"># we get around to that.</span>
+<span id="L9" class="LineNr">  9 </span>
+<span id="L10" class="LineNr"> 10 </span>== code
+<span id="L11" class="LineNr"> 11 </span>
+<span id="L12" class="LineNr"> 12 </span><span class="subxFunction">open</span>:  <span class="subxComment"># filename: (addr array byte), write?: boolean, out: (addr handle buffered-file)</span>
+<span id="L13" class="LineNr"> 13 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L14" class="LineNr"> 14 </span>    55/push-ebp
+<span id="L15" class="LineNr"> 15 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L16" class="LineNr"> 16 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L17" class="LineNr"> 17 </span>    50/push-eax
+<span id="L18" class="LineNr"> 18 </span>    51/push-ecx
+<span id="L19" class="LineNr"> 19 </span>    52/push-edx
+<span id="L20" class="LineNr"> 20 </span>    53/push-ebx
+<span id="L21" class="LineNr"> 21 </span>    56/push-esi
+<span id="L22" class="LineNr"> 22 </span>    57/push-edi
+<span id="L23" class="LineNr"> 23 </span>    <span class="subxComment"># ecx = filename</span>
+<span id="L24" class="LineNr"> 24 </span>    8b/-&gt; *(ebp+8) 1/r32/ecx
+<span id="L25" class="LineNr"> 25 </span>    <span class="subxComment"># var size/edx: int = filename-&gt;length + 1 for the trailing null character</span>
+<span id="L26" class="LineNr"> 26 </span>    8b/-&gt; *ecx 2/r32/edx
+<span id="L27" class="LineNr"> 27 </span>    42/increment-edx
+<span id="L28" class="LineNr"> 28 </span>    <span class="subxComment"># var s/esi: (stream size)</span>
+<span id="L29" class="LineNr"> 29 </span>    29/subtract-from %esp 2/r32/edx
+<span id="L30" class="LineNr"> 30 </span>    52/push-edx  <span class="subxComment"># size</span>
+<span id="L31" class="LineNr"> 31 </span>    68/push 0/imm32/read
+<span id="L32" class="LineNr"> 32 </span>    68/push 0/imm32/write
+<span id="L33" class="LineNr"> 33 </span>    89/&lt;- %esi 4/r32/esp
+<span id="L34" class="LineNr"> 34 </span>    <span class="subxComment"># copy filename and a final null character</span>
+<span id="L35" class="LineNr"> 35 </span>    (<a href='106stream.subx.html#L17'>clear-stream</a> %esi)
+<span id="L36" class="LineNr"> 36 </span>    (<a href='108write.subx.html#L24'>write</a> %esi %ecx)
+<span id="L37" class="LineNr"> 37 </span>    <span class="subxComment"># spill edx</span>
+<span id="L38" class="LineNr"> 38 </span>    52/push-edx
+<span id="L39" class="LineNr"> 39 </span>    <span class="subxComment"># var fd/ecx: fd = open(filename)</span>
+<span id="L40" class="LineNr"> 40 </span>    8d/copy-address *(esi+0xc) 3/r32/ebx
+<span id="L41" class="LineNr"> 41 </span>    8b/-&gt; *(ebp+0xc) 1/r32/ecx/flags
+<span id="L42" class="LineNr"> 42 </span>    ba/copy-to-edx 0x180/imm32/permissions
+<span id="L43" class="LineNr"> 43 </span>    e8/call syscall_open/disp32
+<span id="L44" class="LineNr"> 44 </span>    89/&lt;- %ecx 0/r32/eax
+<span id="L45" class="LineNr"> 45 </span>    <span class="subxComment"># restore edx</span>
+<span id="L46" class="LineNr"> 46 </span>    5a/pop-to-edx
+<span id="L47" class="LineNr"> 47 </span>    <span class="subxComment"># allocate a buffered-file</span>
+<span id="L48" class="LineNr"> 48 </span>    (<a href='120allocate.subx.html#L66'>allocate</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> 0x1010 *(ebp+0x10))  <span class="subxComment"># file-buffer-size + 16 for other fields</span>
+<span id="L49" class="LineNr"> 49 </span>    <span class="subxComment"># var out-addr/edi: (addr buffered-file)</span>
+<span id="L50" class="LineNr"> 50 </span>    8b/-&gt; *(ebp+0x10) 7/r32/edi
+<span id="L51" class="LineNr"> 51 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *edi *(edi+4))  <span class="subxComment"># =&gt; eax</span>
+<span id="L52" class="LineNr"> 52 </span>    89/&lt;- %edi 0/r32/eax
+<span id="L53" class="LineNr"> 53 </span>    <span class="subxComment"># out-addr-&gt;size = 4KB</span>
+<span id="L54" class="LineNr"> 54 </span>    c7 0/subop/copy *(edi+0xc) 0x1000/imm32/file-buffer-size  <span class="subxComment"># Stream-size + 4 for fd</span>
+<span id="L55" class="LineNr"> 55 </span>    <span class="subxComment"># out-addr-&gt;fd = fd</span>
+<span id="L56" class="LineNr"> 56 </span>    89/&lt;- *edi 1/r32/ecx
+<span id="L57" class="LineNr"> 57 </span><span class="Constant">$open:end</span>:
+<span id="L58" class="LineNr"> 58 </span>    <span class="subxS1Comment"># . reclaim locals</span>
+<span id="L59" class="LineNr"> 59 </span>    01/add-to %esp 2/r32/edx
+<span id="L60" class="LineNr"> 60 </span>    81 0/subop/add %esp 0xc/imm32
+<span id="L61" class="LineNr"> 61 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L62" class="LineNr"> 62 </span>    5f/pop-to-edi
+<span id="L63" class="LineNr"> 63 </span>    5e/pop-to-esi
+<span id="L64" class="LineNr"> 64 </span>    5b/pop-to-ebx
+<span id="L65" class="LineNr"> 65 </span>    5a/pop-to-edx
+<span id="L66" class="LineNr"> 66 </span>    59/pop-to-ecx
+<span id="L67" class="LineNr"> 67 </span>    58/pop-to-eax
+<span id="L68" class="LineNr"> 68 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L69" class="LineNr"> 69 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L70" class="LineNr"> 70 </span>    5d/pop-to-ebp
+<span id="L71" class="LineNr"> 71 </span>    c3/return
+<span id="L72" class="LineNr"> 72 </span>
+<span id="L73" class="LineNr"> 73 </span><span class="subxFunction">populate-buffered-file-containing</span>:  <span class="subxComment"># contents: (addr array byte), out: (addr handle buffered-file)</span>
+<span id="L74" class="LineNr"> 74 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L75" class="LineNr"> 75 </span>    55/push-ebp
+<span id="L76" class="LineNr"> 76 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L77" class="LineNr"> 77 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L78" class="LineNr"> 78 </span>    50/push-eax
+<span id="L79" class="LineNr"> 79 </span>    51/push-ecx
+<span id="L80" class="LineNr"> 80 </span>    56/push-esi
+<span id="L81" class="LineNr"> 81 </span>    57/push-edi
+<span id="L82" class="LineNr"> 82 </span>    <span class="subxComment"># esi = contents</span>
+<span id="L83" class="LineNr"> 83 </span>    8b/-&gt; *(ebp+8) 6/r32/esi
+<span id="L84" class="LineNr"> 84 </span>    <span class="subxComment"># var n/ecx: int = len(contents)</span>
+<span id="L85" class="LineNr"> 85 </span>    8b/-&gt; *esi 1/r32/ecx
+<span id="L86" class="LineNr"> 86 </span>    <span class="subxComment"># var stream/edi: (handle stream byte)</span>
+<span id="L87" class="LineNr"> 87 </span>    68/push 0/imm32
+<span id="L88" class="LineNr"> 88 </span>    68/push 0/imm32
+<span id="L89" class="LineNr"> 89 </span>    89/&lt;- %edi 4/r32/esp
+<span id="L90" class="LineNr"> 90 </span>    <span class="subxComment"># allocate stream</span>
+<span id="L91" class="LineNr"> 91 </span>    (<a href='121new-stream.subx.html#L8'>new-stream</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> %ecx 1 %edi)
+<span id="L92" class="LineNr"> 92 </span>    <span class="subxComment"># var stream-addr/edi: (addr stream byte) = lookup(stream)</span>
+<span id="L93" class="LineNr"> 93 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *edi *(edi+4))  <span class="subxComment"># =&gt; eax</span>
+<span id="L94" class="LineNr"> 94 </span>    89/&lt;- %edi 0/r32/eax
+<span id="L95" class="LineNr"> 95 </span>    <span class="subxComment"># write contents to stream</span>
+<span id="L96" class="LineNr"> 96 </span>    (<a href='108write.subx.html#L24'>write</a> %edi %esi)
+<span id="L97" class="LineNr"> 97 </span>    <span class="subxComment"># allocate buffered-file</span>
+<span id="L98" class="LineNr"> 98 </span>    (<a href='120allocate.subx.html#L66'>allocate</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> 0x110 *(ebp+0xc))
+<span id="L99" class="LineNr"> 99 </span>    <span class="subxComment"># var out-addr/eax: (addr buffered-file)</span>
+<span id="L100" class="LineNr">100 </span>    8b/-&gt; *(ebp+0xc) 0/r32/eax
+<span id="L101" class="LineNr">101 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *eax *(eax+4))  <span class="subxComment"># =&gt; eax</span>
+<span id="L102" class="LineNr">102 </span>    <span class="subxComment"># out-addr-&gt;size = 256 bytes</span>
+<span id="L103" class="LineNr">103 </span>    c7 0/subop/copy *(eax+0xc) 0x100/imm32/file-buffer-size
+<span id="L104" class="LineNr">104 </span>    <span class="subxComment"># out-addr-&gt;fd = stream</span>
+<span id="L105" class="LineNr">105 </span>    89/&lt;- *eax 7/r32/edi
+<span id="L106" class="LineNr">106 </span><span class="Constant">$populate-buffered-file-containing:end</span>:
+<span id="L107" class="LineNr">107 </span>    <span class="subxS1Comment"># . reclaim locals</span>
+<span id="L108" class="LineNr">108 </span>    81 0/subop/add %esp 8/imm32
+<span id="L109" class="LineNr">109 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L110" class="LineNr">110 </span>    5f/pop-to-edi
+<span id="L111" class="LineNr">111 </span>    5e/pop-to-esi
+<span id="L112" class="LineNr">112 </span>    59/pop-to-ecx
+<span id="L113" class="LineNr">113 </span>    58/pop-to-eax
+<span id="L114" class="LineNr">114 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L115" class="LineNr">115 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L116" class="LineNr">116 </span>    5d/pop-to-ebp
+<span id="L117" class="LineNr">117 </span>    c3/return
+<span id="L118" class="LineNr">118 </span>
+<span id="L119" class="LineNr">119 </span><span class="subxFunction">new-buffered-file</span>:  <span class="subxComment"># out: (addr handle buffered-file)</span>
+<span id="L120" class="LineNr">120 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L121" class="LineNr">121 </span>    55/push-ebp
+<span id="L122" class="LineNr">122 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L123" class="LineNr">123 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L124" class="LineNr">124 </span>    50/push-eax
+<span id="L125" class="LineNr">125 </span>    51/push-ecx
+<span id="L126" class="LineNr">126 </span>    <span class="subxComment"># var stream/ecx: (handle stream byte)</span>
+<span id="L127" class="LineNr">127 </span>    68/push 0/imm32
+<span id="L128" class="LineNr">128 </span>    68/push 0/imm32
+<span id="L129" class="LineNr">129 </span>    89/&lt;- %ecx 4/r32/esp
+<span id="L130" class="LineNr">130 </span>    <span class="subxComment"># allocate stream</span>
+<span id="L131" class="LineNr">131 </span>    (<a href='121new-stream.subx.html#L8'>new-stream</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> 0x100 1 %ecx)
+<span id="L132" class="LineNr">132 </span>    <span class="subxComment"># var stream-addr/ecx: (addr stream byte) = lookup(stream)</span>
+<span id="L133" class="LineNr">133 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *ecx *(ecx+4))  <span class="subxComment"># =&gt; eax</span>
+<span id="L134" class="LineNr">134 </span>    89/&lt;- %ecx 0/r32/eax
+<span id="L135" class="LineNr">135 </span>    <span class="subxComment"># allocate buffered-file</span>
+<span id="L136" class="LineNr">136 </span>    (<a href='120allocate.subx.html#L66'>allocate</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> 0x110 *(ebp+8))
+<span id="L137" class="LineNr">137 </span>    <span class="subxComment"># var out-addr/eax: (addr buffered-file)</span>
+<span id="L138" class="LineNr">138 </span>    8b/-&gt; *(ebp+8) 0/r32/eax
+<span id="L139" class="LineNr">139 </span>    (<a href='120allocate.subx.html#L256'>lookup</a> *eax *(eax+4))  <span class="subxComment"># =&gt; eax</span>
+<span id="L140" class="LineNr">140 </span>    <span class="subxComment"># out-addr-&gt;size = 256 bytes</span>
+<span id="L141" class="LineNr">141 </span>    c7 0/subop/copy *(eax+0xc) 0x100/imm32/file-buffer-size
+<span id="L142" class="LineNr">142 </span>    <span class="subxComment"># out-addr-&gt;fd = stream</span>
+<span id="L143" class="LineNr">143 </span>    89/&lt;- *eax 1/r32/ecx
+<span id="L144" class="LineNr">144 </span><span class="Constant">$new-buffered-file:end</span>:
+<span id="L145" class="LineNr">145 </span>    <span class="subxS1Comment"># . reclaim locals</span>
+<span id="L146" class="LineNr">146 </span>    81 0/subop/add %esp 8/imm32
+<span id="L147" class="LineNr">147 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L148" class="LineNr">148 </span>    59/pop-to-ecx
+<span id="L149" class="LineNr">149 </span>    58/pop-to-eax
+<span id="L150" class="LineNr">150 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L151" class="LineNr">151 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L152" class="LineNr">152 </span>    5d/pop-to-ebp
+<span id="L153" class="LineNr">153 </span>    c3/return
 </pre>
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