Chapter 10: Structs and Memory

Co-authored-by: Thalia Archibald <thalia@archibald.dev>
Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: Dibyendu Majumdar <mobile@majumdar.org.uk>
Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com>
Co-authored-by: tannal <tannal2409@gmail.com>
Co-authored-by: hadha <helsgithub15@gmail.com>
Co-authored-by: XmiliaH <xmilia.hermit@gmail.com>
Co-authored-by: Tamás Hadházy <85063808+Hels15@users.noreply.github.com>
Co-authored-by: Symious <14933944+symious@users.noreply.github.com>
Co-authored-by: RobertObkircher <robert.obkircher@gmail.com>
Co-authored-by: Robert Obkircher <robert.obkircher@gmail.com>
Co-authored-by: Jun Kawasaki <jun784@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#8[1] → #7 · MEM</title></path><path class="edge DATA" id="e8i2" d="M411,118 L411,130 Q411,138 419,138 L544,138 Q552,138 552,146 L552,226 Q552,234 544,234 L524,234 Q516,234 516,242 L516,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[2] → #5 · DATA</title></path><path class="edge DATA" id="e8i3" d="M563,118 L563,236 Q563,244 555,244 L548,244 Q540,244 540,252 L540,272" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#8[3] → #6 · DATA</title></path><path class="edge MEM" id="e10i1" d="M504,328 L504,340 Q504,348 496,348 L385,348 Q377,348 377,356 L377,376" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[1] → #8 · MEM</title></path><path class="edge MEM" id="e10i2" d="M101,536 L101,541 Q101,546 106,546 L459,546 Q467,546 467,538 L467,366 Q467,358 459,358 L425,358 Q417,358 417,366 L417,376" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#10[2] → #15 · MEM</title></path><path class="edge DATA" id="e11i1" d="M253,118 L253,123 Q253,128 248,128 L178,128 Q170,128 170,136 L170,168" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[1] → #4 · DATA</title></path><path class="edge DATA" id="e11i2" d="M312,328 L312,333 Q312,338 317,338 L404,338 Q412,338 412,330 L412,166 Q412,158 404,158 L215,158 Q210,158 210,163 L210,168" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#11[2] → #17 · DATA</title></path><path class="edge CTRL" id="e15i0" d="M65,432 L65,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#15[0] → #13 · CTRL</title></path><path class="edge MEM" id="e15i1" d="M397,432 L397,437 Q397,442 392,442 L97,442 Q89,442 89,450 L89,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#15[1] → #10 · MEM</title></path><path class="edge DATA" id="e15i2" 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1;"><title>#17[2] → #16 · DATA</title></path><path class="edge CTRL" id="e18i0" d="M521,432 L521,480" stroke="#b63838" marker-start="url(#arrow-CTRL)" style="opacity: 1;"><title>#18[0] → #14 · CTRL</title></path><path class="edge MEM" id="e18i1" d="M397,432 L397,437 Q397,442 402,442 L537,442 Q545,442 545,450 L545,480" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#18[1] → #10 · MEM</title></path><path class="edge DATA" id="e18i2" d="M411,118 L411,130 Q411,138 419,138 L566,138 Q574,138 574,146 L574,439.5 Q574,442 571.5,442 L571.5,442 Q569,442 569,444.5 L569,480" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#18[2] → #5 · DATA</title></path><path class="edge MEM" id="e19i1" d="M397,432 L397,437 Q397,442 402,442 L469,442 Q477,442 477,450 L477,584" stroke="#2867b2" marker-start="url(#arrow-MEM)" style="opacity: 1;"><title>#19[1] → #10 · MEM</title></path><path class="edge DATA" id="e19i2" d="M557,536 L557,541 Q557,546 552,546 L515,546 Q507,546 507,554 L507,584" stroke="#536477" marker-start="url(#arrow-DATA)" style="opacity: 1;"><title>#19[2] → #18 · 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(73,24)" style="opacity: 1;"><path class="box" d="M0,0H240V44H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="120" y="18"><tspan>Start</tspan><tspan class="node-id">  #1</tspan></text><text class="type" text-anchor="middle" y="35" x="120"/><title>#1 Start
+Type not computed
+
+</title></g><g class="node" id="n3" data-id="3" transform="translate(73,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>$mem</tspan><tspan class="node-id">  #3/1</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#3 $mem
+Projection 1 of #1
+Type not computed
+
+[0] → #1  MEM</title></g><g class="node" id="n4" data-id="4" transform="translate(193,68)" style="opacity: 1;"><path class="box" d="M0,0H120V44H0Z" fill="#edf3f7"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>arg</tspan><tspan class="node-id">  #4/2</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#4 arg
+Projection 2 of #1
+Type not computed
+
+[0] → #1  DATA</title></g><g class="node" id="n5" data-id="5" transform="translate(351,68)" 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>new Point</tspan><tspan class="node-id">  #5</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#5 new Point
+Type not computed
+
+[0] → —  CTRL</title><circle class="port" cx="60" cy="-3" r="3" fill="white"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n6" data-id="6" transform="translate(503,68)" 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">  #6</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#6 #0
+Type not computed
+
+[0] → #1  ASSOC</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n7" data-id="7" transform="translate(422,174)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Store p.x</tspan><tspan class="node-id">  #7</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#7 Store p.x
+Type not computed
+
+[0] → —  CTRL
+[1] → #3  MEM
+[2] → #5  DATA
+[3] → #6  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n8" data-id="8" transform="translate(444,278)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Store p.y</tspan><tspan class="node-id">  #8</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#8 Store p.y
+Type not computed
+
+[0] → —  CTRL
+[1] → #7  MEM
+[2] → #5  DATA
+[3] → #6  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="white"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n10" data-id="10" transform="translate(337,382)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Phi $mem</tspan><tspan class="node-id">  #10</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#10 Phi $mem
+Type not computed
+
+[0] → —  ASSOC
+[1] → #8  MEM
+[2] → #15  MEM</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><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="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n11" data-id="11" transform="translate(130,174)" style="opacity: 1;"><path class="box" d="M12,0H108L120,22L108,44H12L0,22Z" fill="#f5e4fa"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Phi arg</tspan><tspan class="node-id">  #11</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#11 Phi arg
+Type not computed
+
+[0] → —  ASSOC
+[1] → #4  DATA
+[2] → #17  DATA</title><circle class="port" cx="0" cy="-3" r="3" fill="white"/><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="0" y="-10" text-anchor="middle">0</text><text class="slot" x="40" y="-10" text-anchor="middle">1</text><text class="slot" x="80" y="-10" text-anchor="middle">2</text></g><g class="node" id="n13" data-id="13" transform="translate(24,400)" style="opacity: 1;"><path class="box" d="M0,0H82V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="41" y="17"><tspan>True</tspan><tspan class="node-id">  #13/0</tspan></text><text class="type" text-anchor="middle" y="35" x="41"/><title>#13 True
+Projection 0 of #0
+Type not computed
+
+</title></g><g class="node" id="n14" data-id="14" transform="translate(477,400)" style="opacity: 1;"><path class="box" d="M0,0H87V26H0Z" fill="#fff1c4"/><text class="label" text-anchor="middle" x="43.5" y="17"><tspan>False</tspan><tspan class="node-id">  #14/1</tspan></text><text class="type" text-anchor="middle" y="35" x="43.5"/><title>#14 False
+Projection 1 of #0
+Type not computed
+
+</title></g><g class="node" id="n15" data-id="15" transform="translate(41,486)" style="opacity: 1;"><path class="box" d="M10,0H110L120,10V34L110,44H10L0,34V10Z" fill="#dcecff"/><text class="label" text-anchor="middle" x="60" y="18"><tspan>Store p.x</tspan><tspan class="node-id">  #15</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#15 Store p.x
+Type not computed
+
+[0] → #13  CTRL
+[1] → #10  MEM
+[2] → #5  DATA
+[3] → #11  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="#536477"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n16" data-id="16" transform="translate(282,174)" 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>#1</tspan><tspan class="node-id">  #16</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#16 #1
+Type not computed
+
+[0] → #1  ASSOC</title><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><text class="slot" x="60" y="-10" text-anchor="middle">0</text></g><g class="node" id="n17" data-id="17" transform="translate(252,278)" 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>-</tspan><tspan class="node-id">  #17</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#17 -
+Type not computed
+
+[0] → —  CTRL
+[1] → #11  DATA
+[2] → #16  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</text></g><g class="node" id="n18" data-id="18" transform="translate(497,486)" 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>Load p.x</tspan><tspan class="node-id">  #18</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#18 Load p.x
+Type not computed
+
+[0] → #14  CTRL
+[1] → #10  MEM
+[2] → #5  DATA
+[3] → —  DATA</title><circle class="port" cx="24" cy="-3" r="3" fill="#536477"/><circle class="port" cx="48" cy="-3" r="3" fill="#536477"/><circle class="port" cx="72" cy="-3" r="3" fill="#536477"/><circle class="port" cx="96" cy="-3" r="3" fill="white"/><text class="slot" x="24" y="-10" text-anchor="middle">0</text><text class="slot" x="48" y="-10" text-anchor="middle">1</text><text class="slot" x="72" y="-10" text-anchor="middle">2</text><text class="slot" x="96" y="-10" text-anchor="middle">3</text></g><g class="node" id="n19" data-id="19" transform="translate(417,590)" 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">  #19</tspan></text><text class="type" text-anchor="middle" y="35" x="60"/><title>#19 Return
+Type not computed
+
+[0] → —  CTRL
+[1] → #10  MEM
+[2] → #18  DATA</title><circle class="port" cx="30" cy="-3" r="3" fill="white"/><circle class="port" cx="60" cy="-3" r="3" fill="#536477"/><circle class="port" cx="90" cy="-3" r="3" fill="#536477"/><text class="slot" x="30" y="-10" text-anchor="middle">0</text><text class="slot" x="60" y="-10" text-anchor="middle">1</text><text class="slot" x="90" y="-10" text-anchor="middle">2</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>