Mercurial > hg > Papers > 2020 > anatofuz-sigos

changeset 54:b11a5c6c2905

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add css
author anatofuz <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Wed, 27 May 2020 14:32:41 +0900
parents f68cad98da69
children 58349e71879a
files slide/assets/logo.svg slide/slide.html slide/slide.md slide/themes/.keep slide/themes/example.css
diffstat 5 files changed, 893 insertions(+), 13 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slide/assets/logo.svg	Wed May 27 14:32:41 2020 +0900
@@ -0,0 +1,683 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   id="svg3004"
+   version="1.1"
+   inkscape:version="0.48.5 r10040"
+   width="825.635"
+   height="268.76"
+   xml:space="preserve"
+   sodipodi:docname="logo.pdf"><metadata
+     id="metadata3010"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
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+       id="clipPath3018"><path
+         d="m 8.504,8.504 643,0 0,198 -643,0 0,-198 z"
+         id="path3020" /></clipPath></defs><sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="640"
+     inkscape:window-height="480"
+     id="namedview3006"
+     showgrid="false"
+     inkscape:zoom="0.38152452"
+     inkscape:cx="412.8175"
+     inkscape:cy="134.38"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
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+     id="g3012"
+     inkscape:groupmode="layer"
+     inkscape:label="logo"
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--- a/slide/slide.html	Tue May 26 18:36:10 2020 +0900
+++ b/slide/slide.html	Wed May 27 14:32:41 2020 +0900
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slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
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+
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+
+/* @theme aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6 */div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="1" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>xv6の構成要素の継続の分析</h1>
 <ul>
 <li>清水 隆博
@@ -23,7 +27,7 @@
 </li>
 </ul>
 </section>
-</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="2" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>研究目的</h1>
 <ul>
 <li>アプリケーションの信頼性を向上させるたい
@@ -44,7 +48,7 @@
 </li>
 </ul>
 </section>
-</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="3" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>OSの信頼性</h1>
 <ul>
 <li>OSそのもの動作も保証されるべき</li>
@@ -67,7 +71,7 @@
 <li>ノーマル、メタレベルの計算の両方を保証しないといけない</li>
 </ul>
 </section>
-</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="4" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>テスト以外で信頼性を高める方法</h1>
 <ul>
 <li>モデル検査
@@ -93,7 +97,7 @@
 <li>OSをこれらの方法で信頼性を高めたい</li>
 </ul>
 </section>
-</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="5" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>OSの信頼性を高めるためには</h1>
 <ul>
 <li>既存のOSのソースコードをそのまま使うのは困難</li>
@@ -116,24 +120,126 @@
 </li>
 </ul>
 </section>
-</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="6" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
 <h1>Continuation Based C</h1>
 <ul>
-<li>ノーマルレベル/メタレベルの実装に適している言語</li>
+<li>ノーマルレベル/メタレベルの実装に適している言語
+<ul>
+<li>通称CbC</li>
+</ul>
+</li>
 <li>C言語の下位言語であり、 いくつかのCコンパイラ上で実装している
 <ul>
 <li>gcc</li>
 <li>llvm/clang</li>
 </ul>
 </li>
+<li>C言語の構文は使用可能だが、 関数呼び出しの他に軽量継続を持つ
+<ul>
+<li>関数呼び出し時のスタックの操作を行わず<code>jmp</code>命令で次の処理に移動する</li>
+<li>schemaなどと違い環境を持たず継続するために軽量継続と呼ぶ</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="7" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
+<h1>CbCとCodeGear</h1>
+<ul>
+<li>軽量継続で表現する単位をCodeGearと呼ぶ</li>
+<li>CodeGearはCの関数とアセンブラの中間の様に使える</li>
+<li>CodeGearは返り値の型の代わりに<code>__code</code>で宣言する</li>
+</ul>
+<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>__code cbc<span class="hljs-constructor">_read(<span class="hljs-params">__code</span> (<span class="hljs-operator">*</span><span class="hljs-params">next</span>)</span>(<span class="hljs-built_in">int</span> ret)){
+    <span class="hljs-keyword">struct</span> file *f;
+    <span class="hljs-built_in">int</span> n;
+    <span class="hljs-built_in">char</span> *p;
+
+    <span class="hljs-keyword">if</span>(argfd(<span class="hljs-number">0</span>, <span class="hljs-number">0</span>, &amp;f) &lt; <span class="hljs-number">0</span><span class="hljs-operator"> || </span>argint(<span class="hljs-number">2</span>, &amp;n) &lt; <span class="hljs-number">0</span><span class="hljs-operator"> || </span>argptr(<span class="hljs-number">1</span>, &amp;p, n) &lt; <span class="hljs-number">0</span>) {
+        goto next<span class="hljs-number">(-1)</span>;
+    }
+    goto cbc<span class="hljs-constructor">_fileread(<span class="hljs-params">f</span>, <span class="hljs-params">p</span>, <span class="hljs-params">n</span>, <span class="hljs-params">next</span>)</span>;
+}
+</span></span></foreignObject></svg></code></pre>
+<ul>
+<li>cbcで書き直したxv6の<code>read</code>システムコールの例</li>
 </ul>
 </section>
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+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="8" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
+<h1>CbCの呼び出し</h1>
+<ul>
+<li>CbCは<code>goto</code>文で呼び出す</li>
+<li>cbcで書き直したシステムコールディスパッチの例
+<ul>
+<li>受け取ったシステムコール番号に対応するCodeGearに継続する</li>
+</ul>
+</li>
+</ul>
+<pre><code class="language-c"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">syscall</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span>
+</span>{
+    <span class="hljs-keyword">int</span> num;
+    <span class="hljs-keyword">int</span> ret;
+
+    <span class="hljs-keyword">if</span>((num &gt;= NELEM(syscalls)) &amp;&amp; (num &lt;= NELEM(cbccodes)) &amp;&amp; cbccodes[num]) {
+        proc-&gt;cbc_arg.cbc_console_arg.num = num;
+        <span class="hljs-keyword">goto</span> (cbccodes[num])(cbc_ret);
+    }
+</span></span></foreignObject></svg></code></pre>
+<ul>
+<li>呼び出し元には返ってこない</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="9" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
+<h1>CbCを用いたOSの再実装</h1>
+<ul>
+<li>CbCのCodeGearは状態遷移単位での記述に向いている</li>
+<li>状態遷移を基本としたモデルに変換し、HoareLogicなどの形式手法を用いて信頼性を高めたい</li>
+<li>CbCは比較的文法が簡易
+<ul>
+<li>Agda/Coqなどの定理証明からCbCへのコード変換が可能であると考えている</li>
+</ul>
+</li>
+<li>CbCや定理証明系を用いてアプリケーションとOSを再実装したい
+<ul>
+<li>最初の段階として既存のOSをCbCで再実装する</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="10" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
+<h1>xv6</h1>
+<ul>
+<li>マサチューセッツ工科大学で開発されたv6OSをもとにしたOS
+<ul>
+<li>x86向けにANSI Cで実装されている</li>
+</ul>
+</li>
+<li>比較的小さなUNIX
+<ul>
+<li>基本的な機能は実装されている</li>
+<li>システムコール、 ファイルシステム、 プロセス処理...</li>
+</ul>
+</li>
+<li>Raspberry Pi上で動作を目指したARM用のバージョンも存在する
+<ul>
+<li>やっぱりRaspberryPiで動かしたい</li>
+<li>今回は ARMのバージョンをCbCで再実装する</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-theme="aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6" data-marpit-pagination="11" data-marpit-pagination-total="11" style="--paginate:true;--theme:aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6;">
+<h1>test</h1>
+<ul>
+<li>aa</li>
+<li>aa</li>
+</ul>
+</section>
+<script>!function(){"use strict";function t(t){Array.from(document.getElementsByTagName("svg"),e=>{if(e.hasAttribute("data-marpit-svg")){const{clientHeight:r,clientWidth:a}=e;e.style.transform||(e.style.transform="translateZ(0)");const o=t||e.currentScale||1,i=e.viewBox.baseVal.width/o,n=e.viewBox.baseVal.height/o,s=Math.min(r/n,a/i);Array.from(e.querySelectorAll(":scope > foreignObject"),t=>{const e=t.x.baseVal.value,o=t.y.baseVal.value;Array.from(t.querySelectorAll(":scope > section"),t=>{t.style.transformOrigin||(t.style.transformOrigin="0 0");const l=(a-s*i)/2-e,c=(r-s*n)/2-o;t.style.transform=`translate3d(${l}px,${c}px,0) scale(${s}) translate(${e}px,${o}px)`})})}})}const e=(t,e,r)=>{if(t.getAttribute(e)!==r)return t.setAttribute(e,r),!0};function r(a=!0){for(const e of"Apple Computer, Inc."===navigator.vendor?[t]:[])e();Array.from(document.querySelectorAll('svg[data-marp-fitting="svg"]'),t=>{const r=t.firstChild,a=r.firstChild,{scrollWidth:o,scrollHeight:i}=a;let n,s=1;if(t.hasAttribute("data-marp-fitting-code")&&(n=t.parentElement.parentElement),t.hasAttribute("data-marp-fitting-math")&&(n=t.parentElement),n){const t=getComputedStyle(n),e=Math.ceil(n.clientWidth-parseFloat(t.paddingLeft)-parseFloat(t.paddingRight));e&&(s=e)}const l=Math.max(o,s),c=Math.max(i,1),p=`0 0 ${l} ${c}`;e(r,"width",""+l),e(r,"height",""+c),e(t,"preserveAspectRatio",getComputedStyle(t).getPropertyValue("--preserve-aspect-ratio")||"xMinYMin meet"),e(t,"viewBox",p)&&t.classList.toggle("__reflow__")}),a&&window.requestAnimationFrame(()=>r(a))}!function(){if("undefined"==typeof window)throw new Error("Marp Core's browser script is valid only in browser context.");window.marpCoreBrowserScript?console.warn("Marp Core's browser script has already executed."):(Object.defineProperty(window,"marpCoreBrowserScript",{value:!0}),r())}()}();
+</script></foreignObject></svg></div><script>!function(){"use strict";var e=function(e,t){var n,r=1===(e.parent||e).nodeType?e.parent||e:document.querySelector(e.parent||e),s=[].filter.call("string"==typeof e.slides?r.querySelectorAll(e.slides):e.slides||r.children,(function(e){return"SCRIPT"!==e.nodeName})),a={},o=function(e,t){return(t=t||{}).index=s.indexOf(e),t.slide=e,t},i=function(e,t){a[e]=(a[e]||[]).filter((function(e){return e!==t}))},l=function(e,t){return(a[e]||[]).reduce((function(e,n){return e&&!1!==n(t)}),!0)},c=function(e,t){s[e]&&(n&&l("deactivate",o(n,t)),n=s[e],l("activate",o(n,t)))},d=function(e,t){var r=s.indexOf(n)+e;l(e>0?"next":"prev",o(n,t))&&c(r,t)},u={off:i,on:function(e,t){return(a[e]||(a[e]=[])).push(t),i.bind(null,e,t)},fire:l,slide:function(e,t){if(!arguments.length)return s.indexOf(n);l("slide",o(s[e],t))&&c(e,t)},next:d.bind(null,1),prev:d.bind(null,-1),parent:r,slides:s,destroy:function(e){l("destroy",o(n,e)),a={}}};return(t||[]).forEach((function(e){e(u)})),n||c(0),u};function t(e){e.parent.classList.add("bespoke-marp-parent"),e.slides.map(e=>e.classList.add("bespoke-marp-slide")),e.on("activate",t=>{e.slides.map(e=>e.classList.remove("bespoke-marp-active")),t.slide.classList.add("bespoke-marp-active")})}function n(e=2e3){return t=>{let n;function r(){n&&clearTimeout(n),n=setTimeout(()=>{t.parent.classList.add("bespoke-marp-inactive")},e),t.parent.classList.remove("bespoke-marp-inactive")}document.addEventListener("mousedown",r),document.addEventListener("mousemove",r),document.addEventListener("touchend",r),setTimeout(r,0)}}const r=["AUDIO","BUTTON","INPUT","SELECT","TEXTAREA","VIDEO"];function s(e){e.parent.addEventListener("keydown",e=>{if(!e.target)return;const t=e.target;(r.includes(t.nodeName)||"true"===t.contentEditable)&&e.stopPropagation()})}function a(e){window.addEventListener("load",()=>{for(const t of e.slides){const e=t.querySelector("[data-marp-fitting]")?"":"hideable";t.setAttribute("data-bespoke-marp-load",e)}})}function o(e){let t=0,n=0;Object.defineProperty(e,"fragments",{enumerable:!0,value:e.slides.map(e=>[null,...e.querySelectorAll("[data-marpit-fragment]")])});const r=r=>void 0!==e.fragments[t][n+r],s=(r,s)=>{t=r,n=s,e.fragments.forEach((e,t)=>{e.forEach((e,n)=>{if(null==e)return;const a=t<r||t===r&&n<=s;e.setAttribute("data-bespoke-marp-fragment",a?"active":"inactive"),t===r&&n===s?e.setAttribute("data-bespoke-marp-current-fragment","current"):e.removeAttribute("data-bespoke-marp-current-fragment")})}),e.fragmentIndex=s;const a={slide:e.slides[r],index:r,fragments:e.fragments[r],fragmentIndex:s};e.fire("fragment",a)};e.on("next",()=>{if(r(1))return s(t,n+1),!1;const a=t+1;e.fragments[a]&&s(a,0)}),e.on("prev",()=>{if(r(-1))return s(t,n-1),!1;const a=t-1;e.fragments[a]&&s(a,e.fragments[a].length-1)}),e.on("slide",({index:t,fragment:n})=>{let r=0;if(void 0!==n){const s=e.fragments[t];if(s){const{length:e}=s;r=-1===n?e-1:Math.min(Math.max(n,0),e-1)}}s(t,r)}),s(0,0)}var i,l=function(e,t){return e(t={exports:{}},t.exports),t.exports}((function(e){
 /*!
   * screenfull
-  * v5.0.0 - 2019-09-09
+  * v5.0.2 - 2020-02-13
   * (c) Sindre Sorhus; MIT License
   */
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\ No newline at end of file
--- a/slide/slide.md	Tue May 26 18:36:10 2020 +0900
+++ b/slide/slide.md	Wed May 27 14:32:41 2020 +0900
@@ -1,3 +1,10 @@
+---
+marp: true
+title: xv6の構成要素の継続の分析
+paginate: true
+---
+
+
 # xv6の構成要素の継続の分析
 
 - 清水 隆博
@@ -61,6 +68,78 @@
 ---
 # Continuation Based C
 - ノーマルレベル/メタレベルの実装に適している言語
+    - 通称CbC
 - C言語の下位言語であり、 いくつかのCコンパイラ上で実装している
     - gcc
     - llvm/clang
+- C言語の構文は使用可能だが、 関数呼び出しの他に軽量継続を持つ
+    - 関数呼び出し時のスタックの操作を行わず`jmp`命令で次の処理に移動する
+    - schemaなどと違い環境を持たず継続するために軽量継続と呼ぶ
+
+---
+# CbCとCodeGear
+- 軽量継続で表現する単位をCodeGearと呼ぶ
+- CodeGearはCの関数とアセンブラの中間の様に使える
+- CodeGearは返り値の型の代わりに`__code`で宣言する
+
+```
+__code cbc_read(__code (*next)(int ret)){
+    struct file *f;
+    int n;
+    char *p;
+
+    if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0) {
+        goto next(-1);
+    }
+    goto cbc_fileread(f, p, n, next);
+}
+```
+- cbcで書き直したxv6の`read`システムコールの例
+
+---
+# CbCの呼び出し
+
+- CbCは`goto`文で呼び出す
+- cbcで書き直したシステムコールディスパッチの例
+    - 受け取ったシステムコール番号に対応するCodeGearに継続する
+
+```c
+void syscall(void)
+{
+    int num;
+    int ret;
+
+    if((num >= NELEM(syscalls)) && (num <= NELEM(cbccodes)) && cbccodes[num]) {
+        proc->cbc_arg.cbc_console_arg.num = num;
+        goto (cbccodes[num])(cbc_ret);
+    }
+```
+
+- 呼び出し元には返ってこない
+
+---
+# CbCを用いたOSの再実装
+- CbCのCodeGearは状態遷移単位での記述に向いている
+- 状態遷移を基本としたモデルに変換し、HoareLogicなどの形式手法を用いて信頼性を高めたい
+- CbCは比較的文法が簡易
+    - Agda/Coqなどの定理証明からCbCへのコード変換が可能であると考えている
+- CbCや定理証明系を用いてアプリケーションとOSを再実装したい
+    - 最初の段階として既存のOSをCbCで再実装する
+
+---
+# xv6
+- マサチューセッツ工科大学で開発されたv6OSをもとにしたOS
+    - x86向けにANSI Cで実装されている
+- 比較的小さなUNIX
+    - 基本的な機能は実装されている
+    - システムコール、 ファイルシステム、 プロセス処理...
+- Raspberry Pi上で動作を目指したARM用のバージョンも存在する
+  - やっぱりRaspberryPiで動かしたい
+  - 今回は ARMのバージョンをCbCで再実装する
+
+---
+
+# test
+
+- aa
+- aa
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slide/themes/.keep	Wed May 27 14:32:41 2020 +0900
@@ -0,0 +1,1 @@
+Please add your themes into `themes` directory for using in the deck.
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slide/themes/example.css	Wed May 27 14:32:41 2020 +0900
@@ -0,0 +1,11 @@
+/* @theme example */
+
+@import 'default';
+
+section {
+  background-image: url("assets/logo.svg");
+  background-position: right 3% bottom 2%;
+  background-repeat: no-repeat;
+  background-attachment: 5%;
+  background-size: 20% auto;
+}