From e4dc3273f201ae741637b626998637cce973546b Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 2 Oct 2026 13:04:34 -0700
Subject: First pass README updates

---
 chapter09/docs/09-graph4.svg | 147 +++++++++++++++++++++++--------------------
 1 file changed, 80 insertions(+), 67 deletions(-)

(limited to 'chapter09/docs/09-graph4.svg')

diff --git a/chapter09/docs/09-graph4.svg b/chapter09/docs/09-graph4.svg
index 4eef5414..89045214 100644
--- a/chapter09/docs/09-graph4.svg
+++ b/chapter09/docs/09-graph4.svg
@@ -1,67 +1,80 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
-<!-- Title: chapter09 Pages: 1 -->
-<svg width="178pt" height="248pt"
- viewBox="0.00 0.00 178.00 248.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 244)">
-<title>chapter09</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-244 174,-244 174,4 -4,4"/>
-<g id="clust1" class="cluster">
-<title>cluster_Nodes</title>
-<polygon fill="none" stroke="black" points="8,-8 8,-232 162,-232 162,-8 8,-8"/>
-</g>
-<!-- Start2 -->
-<g id="node1" class="node">
-<title>Start2</title>
-<polygon fill="yellow" stroke="transparent" points="24,-195 24,-220 74,-220 74,-195 24,-195"/>
-<polygon fill="none" stroke="black" points="24,-195 24,-220 74,-220 74,-195 24,-195"/>
-<text text-anchor="start" x="30.5" y="-203.8" font-family="Times,serif" font-size="14.00">Start</text>
-<polygon fill="none" stroke="black" points="24,-164 24,-195 74,-195 74,-164 24,-164"/>
-<polygon fill="yellow" stroke="transparent" points="29,-169 29,-190 69,-190 69,-169 29,-169"/>
-<polygon fill="none" stroke="black" points="29,-169 29,-190 69,-190 69,-169 29,-169"/>
-<text text-anchor="start" x="32" y="-175.8" font-family="Times,serif" font-size="14.00">$ctrl</text>
-</g>
-<!-- Stop3 -->
-<g id="node2" class="node">
-<title>Stop3</title>
-<polygon fill="yellow" stroke="black" points="112,-52 58,-52 58,-16 112,-16 112,-52"/>
-<text text-anchor="middle" x="85" y="-30.3" font-family="Times,serif" font-size="14.00">Stop</text>
-</g>
-<!-- Return10 -->
-<g id="node4" class="node">
-<title>Return10</title>
-<polygon fill="yellow" stroke="black" points="118,-124 52,-124 52,-88 118,-88 118,-124"/>
-<text text-anchor="middle" x="85" y="-102.3" font-family="Times,serif" font-size="14.00">Return</text>
-</g>
-<!-- Stop3&#45;&gt;Return10 -->
-<g id="edge1" class="edge">
-<title>Stop3&#45;&gt;Return10</title>
-<path fill="none" stroke="red" d="M85,-52.3C85,-60.02 85,-69.29 85,-77.89"/>
-<polygon fill="red" stroke="red" points="81.5,-77.9 85,-87.9 88.5,-77.9 81.5,-77.9"/>
-<text text-anchor="middle" x="82" y="-54.9" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Con_9 -->
-<g id="node3" class="node">
-<title>Con_9</title>
-<ellipse fill="none" stroke="black" cx="127" cy="-192" rx="27" ry="18"/>
-<text text-anchor="middle" x="127" y="-188.3" font-family="Times,serif" font-size="14.00">#0</text>
-</g>
-<!-- Return10&#45;&gt;Start2 -->
-<g id="edge2" class="edge">
-<title>Return10&#45;&gt;Start2:p0</title>
-<path fill="none" stroke="red" d="M68.26,-124.13C60.77,-133.26 52.99,-145.23 50.13,-158.06"/>
-<polygon fill="red" stroke="red" points="46.66,-157.67 49,-168 53.61,-158.46 46.66,-157.67"/>
-<text text-anchor="middle" x="65.26" y="-126.73" font-family="Helvetica,sans-Serif" font-size="8.00">0</text>
-</g>
-<!-- Return10&#45;&gt;Con_9 -->
-<g id="edge3" class="edge">
-<title>Return10&#45;&gt;Con_9</title>
-<path fill="none" stroke="black" d="M93.7,-124.4C99.66,-136.31 107.65,-152.3 114.31,-165.62"/>
-<polygon fill="black" stroke="black" points="111.28,-167.38 118.88,-174.76 117.54,-164.25 111.28,-167.38"/>
-<text text-anchor="middle" x="90.7" y="-127" font-family="Helvetica,sans-Serif" font-size="8.00">1</text>
-</g>
-</g>
-</svg>
+<svg aria-label="Compiler graph" width="326" height="320" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 326 320" style="font-family: sans-serif;"><style>
+    html, body { height:100%; margin:0; font-family:sans-serif; }
+    .viewer { height:100%; display:grid; grid-template-rows:auto minmax(0,1fr) auto; }
+    .source { padding:8px; border-bottom:1px solid #ccc; }
+    #program { width:min(600px,80vw); vertical-align:middle; }
+    #status { margin-top:4px; }
+    #graph { min-height:0; overflow:hidden; position:relative; background:#fafbfc; }
+    #elk { width:100%; height:100%; }
+    #graph svg { display:block; }
+    .tools { display:flex; flex-wrap:wrap; align-items:center; gap:14px; margin-top:8px; font-size:12px; }
+    .hint { color:#616c78; }
+    .ctrl { color:#b63838; } .mem { color:#2867b2; } .data { color:#536477; }
+    .edge { fill:none; stroke-width:1.5; }
+    .edge.CTRL { stroke-width:2; }
+    .edge.ASSOC { stroke-dasharray:4 4; }
+    .edge.PARSER { stroke-dasharray:5 4; }
+    .parser rect { fill:#f6f0ff; stroke:#7956a5; stroke-width:1.5; stroke-dasharray:5 4; }
+    .edge.selected { stroke-width:3.5; }
+    .edge.bundle { stroke-width:4; }
+    .edge.bundle.selected { stroke-width:6; }
+    .edge-hit { fill:none; stroke:transparent; stroke-width:12; vector-effect:non-scaling-stroke; pointer-events:stroke; cursor:pointer; }
+    .edge-jump { fill:transparent; pointer-events:all; cursor:pointer; }
+    .node { cursor:pointer; }
+    .box { stroke:#758191; stroke-width:1; }
+    .node.held .box { stroke-dasharray:5 3; }
+    .node.near .box { stroke:#c18221; stroke-width:2; }
+    .node.focus .box { stroke:#9c4900; stroke-width:3; }
+    .node.selected .box { stroke:#1569b9; stroke-width:3; }
+    .node.folded .box { stroke-width:4; }
+    .node.folding .box { fill:#f4ccd7; }
+    .fold-tag { font-size:9px; font-weight:700; fill:#963751; }
+    .peep-area { fill:#fff3d9; fill-opacity:.8; stroke:#c18221; stroke-width:2; pointer-events:none; }
+    .node.peep-edit .box { stroke:#9c4900; stroke-width:3; }
+    .node.error .box { stroke:#b42318; stroke-width:4; }
+    #event.error { color:#b42318; font-weight:600; white-space:pre-wrap; overflow-wrap:anywhere; }
+    .peep-ghosts { pointer-events:none; }
+    .region-box { stroke:#9da9b8; stroke-width:1.5; }
+    .fold-btn { cursor:pointer; }
+    .fold-btn rect { fill:white; stroke:#596674; }
+    .fold-btn text { font-size:14px; fill:#152330; }
+    .fold-btn:focus rect { stroke:#1569b9; stroke-width:2; }
+    .shortcut { cursor:pointer; }
+    .shortcut path { fill:none; stroke-width:1.5; }
+    .shortcut rect { fill:#fff8ec; stroke:#b63838; stroke-dasharray:3 2; }
+    .shortcut text { font-size:11px; fill:#783030; }
+    .shortcut.selected rect, .shortcut:focus rect { stroke-width:2.5; }
+    .label { font-size:12px; fill:#152330; font-weight:600; }
+    .node-id { font-size:10px; fill:#596674; font-weight:400; }
+    .type { font-size:11px; fill:#455768; }
+    .port { stroke:#536477; stroke-width:1; }
+    .row { stroke:#b6afcf; stroke-width:1; }
+    .bind { font-size:12px; fill:#152330; }
+    .slot { font-size:10px; fill:#364352; paint-order:stroke; stroke:#fafbfc; stroke-width:3; }
+    #detail { position:absolute; top:8px; right:8px; margin:0; padding:12px; max-width:320px;
+      max-height:45%; overflow:auto; white-space:pre-wrap; overflow-wrap:anywhere;
+      background:#fffffff2; border:1px solid #bac5d0; border-radius:4px; font-size:12px; }
+    .controls { display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:6px; padding:6px; }
+    .button { color:white; background:black; font-size:20px; min-width:30px; }
+    .button:disabled { background:grey; }
+    .count { font-size:20px; min-width:35px; text-align:center; }
+    #N { width:6ch; }
+    #scrub { width:clamp(120px,35vw,600px); }
+  </style><defs><marker id="arrow-CTRL" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#b63838"/></marker><marker id="arrow-DATA" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#536477"/></marker><marker id="arrow-MEM" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#2867b2"/></marker><marker id="arrow-ASSOC" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#9396a3"/></marker><marker id="arrow-PARSER" viewBox="0 -4 8 8" refX="8" refY="0" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path d="M0,-4L8,0L0,4Z" fill="#7956a5"/></marker></defs><rect width="100%" height="100%" fill="rgb(250, 251, 252)"/><g><g class="regions" style="opacity: 1;"/><rect class="peep-area" rx="36" style="opacity: 0;"/><g class="edges"><path class="edge CTRL" id="e3i0" d="M104,219 C104,243 163,246 163,270" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#3[0] → #10 · CTRL</title></path><path class="edge CTRL" id="e10i0" d="M84,118 L84,166" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#10[0] → #1 · CTRL</title></path><path class="edge DATA" id="e10i1" d="M242,118 L242,128 L124,128 L124,166" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#10[1] → #9 · DATA</title></path></g><g class="edge-hits"/><g class="parser" style="opacity: 1;"/><g class="nodes"><g class="node" id="n1" data-id="1" transform="translate(24,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$ctrl</tspan><tspan class="node-id">  #1/0</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#1 $ctrl
+Projection 0 of #2
+Type not computed
+
+[0] → #2  CTRL</title></g><g class="node" id="n2" data-id="2" transform="translate(24,24)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Start</tspan><tspan class="node-id">  #2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#2 Start
+Type not computed
+
+</title></g><g class="node" id="n3" data-id="3" transform="translate(127,270)" style="opacity: 1;"><path class="box" d="M0,0H72V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="36" y="17"><tspan>Stop</tspan><tspan class="node-id">  #3</tspan></text><text class="type" text-anchor="middle" y="35" x="36"/><title>#3 Stop
+Type not computed
+
+[0] → #10  CTRL</title><circle class="port" cx="36" cy="0" r="3" fill="#536477"/><text class="slot" x="36" y="-7" text-anchor="middle">0</text></g><g class="node" id="n9" data-id="9" transform="translate(182,68)" style="opacity: 1;"><path class="box" d="M14,0H106Q120,0 120,14V30Q120,44 106,44H14Q0,44 0,30V14Q0,0 14,0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>#0</tspan><tspan class="node-id">  #9</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#9 #0
+Type not computed
+
+</title></g><g class="node" id="n10" data-id="10" transform="translate(44,172)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Return</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 Return
+Type not computed
+
+[0] → #1  CTRL
+[1] → #9  DATA</title><circle class="port" cx="40" cy="-3" r="3" fill="#536477"/><circle class="port" cx="80" cy="-3" r="3" fill="#536477"/><text class="slot" x="40" y="-10" text-anchor="middle">0</text><text class="slot" x="80" y="-10" text-anchor="middle">1</text></g></g><g class="region-heads" style="opacity: 1;"/><g class="shortcuts" style="opacity: 1;"/><g class="peep-ghosts" pointer-events="none"/></g></svg>
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