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-rw-r--r--yaegi-internals/ex1_ast_cfg.drawio.svg4
-rw-r--r--yaegi-internals/ex1_cfg.drawio.svg4
-rw-r--r--yaegi-internals/ex1_cfg_loop.drawio.svg4
-rw-r--r--yaegi-internals/ex1_raw_ast.drawio.svg4
-rw-r--r--yaegi-internals/frame1.drawio.svg4
-rw-r--r--yaegi-internals/index.html390
-rw-r--r--yaegi-internals/meta.sh4
-rw-r--r--yaegi-internals/readme.md405
-rw-r--r--yaegi-internals/yaegi_internals_fig1.drawio.svg4
9 files changed, 823 insertions, 0 deletions
diff --git a/yaegi-internals/ex1_ast_cfg.drawio.svg b/yaegi-internals/ex1_ast_cfg.drawio.svg
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+++ b/yaegi-internals/ex1_ast_cfg.drawio.svg
@@ -0,0 +1,4 @@
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y=&quot;238&quot; as=&quot;targetPoint&quot; /&gt;&#10; &lt;/mxGeometry&gt;&#10; &lt;/mxCell&gt;&#10; &lt;mxCell id=&quot;kNLiaCNoJibRKC7dolPK-34&quot; value=&quot;&quot; style=&quot;endArrow=classic;html=1;rounded=0;strokeColor=#00CC00;exitX=0.733;exitY=0.067;exitDx=0;exitDy=0;entryX=0.283;entryY=1.033;entryDx=0;entryDy=0;entryPerimeter=0;exitPerimeter=0;&quot; parent=&quot;1&quot; source=&quot;kNLiaCNoJibRKC7dolPK-17&quot; target=&quot;kNLiaCNoJibRKC7dolPK-24&quot; edge=&quot;1&quot;&gt;&#10; &lt;mxGeometry width=&quot;50&quot; height=&quot;50&quot; relative=&quot;1&quot; as=&quot;geometry&quot;&gt;&#10; &lt;mxPoint x=&quot;261&quot; y=&quot;196&quot; as=&quot;sourcePoint&quot; /&gt;&#10; &lt;mxPoint x=&quot;299&quot; y=&quot;244&quot; as=&quot;targetPoint&quot; /&gt;&#10; &lt;/mxGeometry&gt;&#10; &lt;/mxCell&gt;&#10; &lt;/root&gt;&#10; &lt;/mxGraphModel&gt;&#10; &lt;/diagram&gt;&#10;&lt;/mxfile&gt;&#10;"><defs/><g><g id="cell-kNLiaCNoJibRKC7dolPK-1"><ellipse cx="220" cy="15" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 15px; margin-left: 191px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">1: stmt</div></div></div></foreignObject><text x="220" y="19" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">1: stmt</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-2"><ellipse cx="110" cy="75" rx="30" ry="15" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 75px; margin-left: 81px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">2: :=</div></div></div></foreignObject><text x="110" y="79" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">2: :=</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-3"><ellipse cx="30" cy="145" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 1px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">3: a</div></div></div></foreignObject><text x="30" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">3: a</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-4"><ellipse cx="110" cy="145" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 81px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">4: 3</div></div></div></foreignObject><text x="110" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">4: 3</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-5"><ellipse cx="220" cy="75" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 75px; margin-left: 191px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">5: if</div></div></div></foreignObject><text x="220" y="79" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">5: if</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-6"><ellipse cx="190" cy="145" rx="30" ry="15" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 161px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">6: &gt;</div></div></div></foreignObject><text x="190" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">6: &gt;</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-7"><ellipse cx="110" cy="215" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 215px; margin-left: 81px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">7: a</div></div></div></foreignObject><text x="110" y="219" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">7: a</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-8"><ellipse cx="190" cy="215" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 241px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">9: stmt</div></div></div></foreignObject><text x="270" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">9: stmt</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-17"><ellipse cx="270" cy="215" rx="30" ry="15" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 215px; margin-left: 241px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">10: call</div></div></div></foreignObject><text x="270" y="219" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">10: call</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-18"><ellipse cx="210" cy="285" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 285px; margin-left: 181px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">11: print</div></div></div></foreignObject><text x="210" y="289" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">11: print</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-19"><ellipse cx="330" cy="285" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 285px; margin-left: 301px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">12: "ok"</div></div></div></foreignObject><text x="330" y="289" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">12: "ok"</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-20"><path d="M 227.02 89.01 L 255.22 126.9" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 258.35 131.11 L 251.37 127.59 L 255.22 126.9 L 256.98 123.41 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/></g><g id="cell-kNLiaCNoJibRKC7dolPK-21"><path d="M 270 160 L 270 193.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 270 198.88 L 266.5 191.88 L 270 193.63 L 273.5 191.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/></g><g id="cell-kNLiaCNoJibRKC7dolPK-22"><path d="M 262.98 230.99 L 234.97 269.25" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 231.87 273.49 L 233.18 265.78 L 234.97 269.25 L 238.83 269.91 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/></g><g id="cell-kNLiaCNoJibRKC7dolPK-23"><path d="M 279 230 L 315.42 265.55" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 319.18 269.22 L 311.73 266.83 L 315.42 265.55 L 316.62 261.82 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/></g><g id="cell-kNLiaCNoJibRKC7dolPK-24"><ellipse cx="350" cy="75" rx="30" ry="15" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 241px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">9: stmt</div></div></div></foreignObject><text x="270" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">9: stmt</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-17"><ellipse cx="270" cy="215" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 215px; margin-left: 241px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">10: call</div></div></div></foreignObject><text x="270" y="219" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">10: call</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-18"><ellipse cx="210" cy="285" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 285px; margin-left: 181px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">11: print</div></div></div></foreignObject><text x="210" y="289" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">11: print</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-19"><ellipse cx="330" cy="285" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 75px; margin-left: 321px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">13: call</div></div></div></foreignObject><text x="350" y="79" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">13: call</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-25"><ellipse cx="350" cy="145" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 145px; margin-left: 321px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">14: print</div></div></div></foreignObject><text x="350" y="149" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">14: print</text></switch></g></g><g id="cell-kNLiaCNoJibRKC7dolPK-26"><ellipse cx="440" cy="145" rx="30" ry="15" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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diff --git a/yaegi-internals/frame1.drawio.svg b/yaegi-internals/frame1.drawio.svg
new file mode 100644
index 0000000..eaa406d
--- /dev/null
+++ b/yaegi-internals/frame1.drawio.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 15px; margin-left: 81px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">reflect.Value</div></div></div></foreignObject><text x="110" y="19" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">reflect.Va...</text></switch></g></g><g id="cell-2HcqKHcNLJ_RsXilhcFv-28"><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 78px; height: 1px; padding-top: 245px; margin-left: 71px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">function frame</div></div></div></foreignObject><text x="110" y="249" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">function frame</text></switch></g></g><g id="cell-2HcqKHcNLJ_RsXilhcFv-29"><rect x="400" y="0" width="90" height="50" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 88px; height: 1px; padding-top: 25px; margin-left: 401px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">global frame</div></div></div></foreignObject><text x="445" y="29" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">global frame</text></switch></g></g><g id="cell-2HcqKHcNLJ_RsXilhcFv-30"><rect x="400" y="50" width="90" height="50" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 78px; height: 1px; padding-top: 275px; margin-left: 401px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">stack goroutine 1</div></div></div></foreignObject><text x="440" y="279" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">stack gorouti...</text></switch></g></g><g id="cell-2HcqKHcNLJ_RsXilhcFv-35"><rect x="400" y="190" width="90" height="50" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 88px; height: 1px; padding-top: 135px; margin-left: 511px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">frame 2'</div></div></div></foreignObject><text x="555" y="139" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">frame 2'</text></switch></g></g><g id="cell-2HcqKHcNLJ_RsXilhcFv-39"><rect x="510" y="190" width="90" height="50" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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diff --git a/yaegi-internals/index.html b/yaegi-internals/index.html
new file mode 100644
index 0000000..7981524
--- /dev/null
+++ b/yaegi-internals/index.html
@@ -0,0 +1,390 @@
+<title>Yaegi Internals</title>
+<!-- generated by build.sh. DO NOT EDIT. -->
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<style>
+ body {
+ max-width: 45rem;
+ margin: auto;
+ padding: 0.5em;
+ text-align: justify;
+ }
+ h1 { text-align: center }
+ pre {
+ border: 1px solid;
+ padding: 1ch;
+ border-radius: 5px;
+ overflow: auto;
+ background-color: #eee;
+ }
+</style>
+
+<a href="..">Marc's Programming Notes</a><hr>
+<h1 id="yaegi-internals">Yaegi internals</h1>
+<p><a href="https://github.com/traefik/yaegi">Yaegi</a> is an
+interpreter of the Go language written in Go. This project was started
+in Traefik-Labs initially to provide a simple and practical embedded
+plugin engine for the traefik reverse proxy. Now, more than 200 plugins
+contributed by the community are listed on the public catalog at <a
+href="https://plugins.traefik.io">plugins.traefik.io</a>. The use of
+yaegi extends also to other domains, for example <a
+href="https://github.com/xo/xo">databases</a>, <a
+href="https://github.com/slok/sloth">observability</a>, <a
+href="https://github.com/cyberark/kubesploit">container security</a> and
+many <a
+href="https://github.com/traefik/yaegi/network/dependents?package_id=UGFja2FnZS0yMjc1NTQ3MjIy">others</a>.</p>
+<p>Yaegi is lean and mean, as it delivers in a single package, with no
+external dependency, a complete Go interpreter, compliant with the <a
+href="https://go.dev/ref/spec">Go specification</a>. Lean, but also
+mean: its code is dense, complex, not always idiomatic, and sometimes
+maybe hard to understand.</p>
+<p>This document is here to address that. In the following, after
+getting an overview, we look under the hood, explore the internals and
+discuss the design. Our aim is to provide the essential insights,
+clarify the architecture and the code organization. But first, the
+overview.</p>
+<h2 id="overview-of-architecture">Overview of architecture</h2>
+<p>Let’s see what happens inside yaegi when one executes the following
+line:</p>
+<div class="sourceCode" id="cb1"><pre class="sourceCode go"><code class="sourceCode go"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>interp<span class="op">.</span>Eval<span class="op">(</span><span class="st">`print(&quot;hello&quot;, 2+3)`</span><span class="op">)</span></span></code></pre></div>
+<p>The following figure 1 displays the main steps of evaluation:</p>
+<figure>
+<img src="yaegi_internals_fig1.drawio.svg"
+alt="figure 1: steps of evaluation" />
+<figcaption aria-hidden="true">figure 1: steps of
+evaluation</figcaption>
+</figure>
+<ol type="1">
+<li><p>The <em>scanner</em> (provided by the <a
+href="https://pkg.go.dev/go/scanner">go/scanner</a> package) transforms
+a stream of characters (the source code) into a stream of tokens,
+through a <a
+href="https://en.wikipedia.org/wiki/Lexical_analysis">lexical
+analysis</a> step.</p></li>
+<li><p>The <em>parser</em> (provided by the <a
+href="https://pkg.go.dev/go/parser">go/parser</a> package) transforms
+the stream of tokens into an <a
+href="https://en.wikipedia.org/wiki/Abstract_syntax_tree">abstract
+syntax tree</a> or AST, through a <a
+href="https://en.wikipedia.org/wiki/Syntax_analysis">syntax analysis</a>
+step.</p></li>
+<li><p>The <em>analyser</em> (implemented in the <a
+href="https://pkg.go.dev/github.com/traefik/yaegi/interp">yaegi/interp</a>
+package) performs the checks and creation of type, constant, variable
+and function symbols. It also computes the <a
+href="https://en.wikipedia.org/wiki/Control-flow_graph">control-flow
+graphs</a> and memory allocations for symbols, through <a
+href="https://en.wikipedia.org/wiki/Semantic_analysis_(compilers)">semantic
+analysis</a> steps. All those metadata are obtained from and stored to
+the nodes of the AST, making it annotated.</p></li>
+<li><p>The <em>generator</em> (implemented in the <a
+href="https://pkg.go.dev/github.com/traefik/yaegi/interp">yaegi/interp</a>
+package) reads the annotated AST and produces code intructions to be
+executed, through a <a
+href="https://en.wikipedia.org/wiki/Code_generation_%28compiler%29">code
+generation</a> step.</p></li>
+<li><p>The <em>executor</em> (implemented in the <a
+href="https://pkg.go.dev/github.com/traefik/yaegi/interp">yaegi/interp</a>
+package) runs the code instructions in the context of the
+interpreter.</p></li>
+</ol>
+<p>The interpreter is designed as a simple compiler, except that the
+code is generated into memory instead of object files, and with an
+executor module to run the specific instruction format.</p>
+<p>We won’t spend more details on the scanner and the parser, both
+provided by the standard library, and instead examine directly the
+analyser.</p>
+<h2 id="semantic-analysis">Semantic analysis</h2>
+<p>The analyser performs the semantic analysis of the program to
+interpret. This is done in several steps, all consisting of reading from
+and writing to the AST, so we first examine the details and dynamics of
+our AST representation.</p>
+<h3 id="ast-dynamics">AST dynamics</h3>
+<p>Hereafter stands the most important data structure of any compiler,
+interpreter or other language tool, and the function to use it
+(extracted from <a
+href="https://github.com/traefik/yaegi/blob/8de3add6faf471a807182c7b8198fe863debc9d8/interp/interp.go#L284-L296">here</a>).</p>
+<div class="sourceCode" id="cb2"><pre class="sourceCode go"><code class="sourceCode go"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="co">// node defines a node of a (abstract syntax) tree.</span></span>
+<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="kw">type</span> node <span class="kw">struct</span> <span class="op">{</span></span>
+<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a> <span class="co">// Node children</span></span>
+<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a> child <span class="op">[]*</span>node</span>
+<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a> <span class="co">// Node metadata</span></span>
+<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a> <span class="op">...</span></span>
+<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
+<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a></span>
+<span id="cb2-9"><a href="#cb2-9" aria-hidden="true" tabindex="-1"></a><span class="co">// walk traverses AST n in depth first order, invoking in function</span></span>
+<span id="cb2-10"><a href="#cb2-10" aria-hidden="true" tabindex="-1"></a><span class="co">// at node entry and out function at node exit.</span></span>
+<span id="cb2-11"><a href="#cb2-11" aria-hidden="true" tabindex="-1"></a><span class="kw">func</span> <span class="op">(</span>n <span class="op">*</span>node<span class="op">)</span> walk<span class="op">(</span>in <span class="kw">func</span><span class="op">(</span>n <span class="op">*</span>node<span class="op">)</span> <span class="dt">bool</span><span class="op">,</span> out <span class="kw">func</span><span class="op">(</span>n <span class="op">*</span>node<span class="op">))</span> <span class="op">{</span></span>
+<span id="cb2-12"><a href="#cb2-12" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> in <span class="op">!=</span> <span class="ot">nil</span> <span class="op">&amp;&amp;</span> <span class="op">!</span>in<span class="op">(</span>n<span class="op">)</span> <span class="op">{</span></span>
+<span id="cb2-13"><a href="#cb2-13" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span></span>
+<span id="cb2-14"><a href="#cb2-14" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
+<span id="cb2-15"><a href="#cb2-15" aria-hidden="true" tabindex="-1"></a> <span class="cf">for</span> _<span class="op">,</span> child <span class="op">:=</span> <span class="kw">range</span> n<span class="op">.</span>child <span class="op">{</span></span>
+<span id="cb2-16"><a href="#cb2-16" aria-hidden="true" tabindex="-1"></a> child<span class="op">.</span>Walk<span class="op">(</span>in<span class="op">,</span> out<span class="op">)</span></span>
+<span id="cb2-17"><a href="#cb2-17" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
+<span id="cb2-18"><a href="#cb2-18" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> out <span class="op">!=</span> <span class="ot">nil</span> <span class="op">{</span></span>
+<span id="cb2-19"><a href="#cb2-19" aria-hidden="true" tabindex="-1"></a> out<span class="op">(</span>n<span class="op">)</span></span>
+<span id="cb2-20"><a href="#cb2-20" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
+<span id="cb2-21"><a href="#cb2-21" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
+<p>The above code is deceptively simple. As in many complex systems, an
+important part of the signification is carried by the relationships
+between the elements and the patterns they form. It’s easier to
+understand it by displaying the corresponding graph and consider the
+system as a whole. We can do that using a simple example:</p>
+<div class="sourceCode" id="cb3"><pre class="sourceCode go"><code class="sourceCode go"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>a <span class="op">:=</span> <span class="dv">3</span></span>
+<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="cf">if</span> a <span class="op">&gt;</span> <span class="dv">2</span> <span class="op">{</span></span>
+<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> <span class="bu">print</span><span class="op">(</span><span class="st">&quot;ok&quot;</span><span class="op">)</span></span>
+<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
+<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="bu">print</span><span class="op">(</span><span class="st">&quot;bye&quot;</span><span class="op">)</span></span></code></pre></div>
+<p>The corresponding AST is:</p>
+<figure>
+<img src="ex1_raw_ast.drawio.svg" alt="figure 2: a raw AST" />
+<figcaption aria-hidden="true">figure 2: a raw AST</figcaption>
+</figure>
+<p>This is the raw AST, with no annotations, as obtained from the
+parser. Each node contains an index number (for labelling purpose only),
+and the node type, computed by the parser from the set of Go grammar
+rules (i.e. “stmt” for “list of <a
+href="https://go.dev/ref/spec#Statements">statements</a>”, “call” for
+“call <a href="https://go.dev/ref/spec#Expressions">expression</a>”, …).
+We also recognize the source tokens as literal values in leaf
+locations.</p>
+<p>Walking the tree consists in visiting the nodes starting from the
+root (node 1), in their numbering order (here from 1 to 15): depth first
+(the children before the siblings) and from left to right. At each node,
+a callback <code>in</code> is invoked at entry (pre-processing) and a
+callback <code>out</code> at exit (post-processing).</p>
+<p>When the <code>in</code> callback executes, only the information
+computed in the sub-trees in the left of the node is available, in
+addition to the pre-processing information computed in the node
+ancestors. The <code>in</code> callback returns a boolean. If the result
+is false, the node sub-tree is skipped, allowing to short-cut
+processing, for example to avoid to dive in function bodies and process
+only function signatures.</p>
+<p>When the <code>out</code> callback executes, the results computed on
+the whole descendant sub-trees are available, which is useful for
+example to compute the size of a composite object defined accross nested
+structures. In the absence of post-processing, multiple tree walks are
+necessary to achieve the same result.</p>
+<p>A semantic analysis step is therefore simply a tree walk with the
+right callbacks. In the case of our interpreter, we have two tree walks
+to perform: the globals and types analysis in <a
+href="https://github.com/traefik/yaegi/blob/master/interp/gta.go">interp/gta.go</a>
+and the control-flow graphs analysis in <a
+href="https://github.com/traefik/yaegi/blob/master/interp/cfg.go">interp/cfg.go</a>.
+In both files, notice the call to <code>root.Walk</code>.</p>
+<p>Note: we have chosen to represent the AST as a uniform node structure
+as opposed to the <a href="https://pkg.go.dev/go/ast#Node">ast.Node</a>
+interface in the Go standard library, implemented by specialized types
+for all the node kinds. The main reason is that the tree walk method <a
+href="https://pkg.go.dev/go/ast#Inspect">ast.Inspect</a> only permits a
+pre-processing callback, not a post-processing one, required for several
+compiling steps. It also seemed simpler at the time to start with this
+uniform structure, and we ended up sticking with it.</p>
+<h3 id="globals-and-types-analysis">Globals and types analysis</h3>
+<p>Our first operation on the AST is to check and register all the
+components of the program declared at global level. This is a partial
+analysis, concerned only about declarations and not function
+implementations.</p>
+<p>This step is necessary because in Go, at global level, symbols can be
+used before being declared (as opposed to Go function bodies, or in C in
+general, where use before declaration is simply forbidden in strict
+mode).</p>
+<p>Allowing out of order symbols is what permits the code to be
+scattered arbitrarily amongst several files in packages without more
+constraints. It is indeed an important feature to let the programer
+organize her code as she wants.</p>
+<p>This step, implemented in <a
+href="https://github.com/traefik/yaegi/blob/master/interp/gta.go">interp/gta.go</a>,
+consists in performing a tree walk with only a pre-processing callback
+(no <code>out</code> function is passed). There are two
+particularities:</p>
+<p>The first is the multiple-pass iterative walk. Indeed, in a first
+global pass, instead of failing with an error whenever an incomplete
+definition is met, the reference to the failing sub-tree is kept in a
+list of nodes to be retried, and the walk finishes going over the whole
+tree. Then, all the problematic sub-trees are iteratively retried until
+all the nodes have been defined, or as long as there is progress. That
+is, if two subsequent iterations lead to the exact same state, it is a
+hint that progress is not being made and it would result in an infinite
+loop, at which point yaegi just stops with an error.</p>
+<p>The second particularity is that despite being in a partial analysis
+step, a full interpretation can still be necessary on an expression
+sub-tree if this one serves to implement a global type definition. For
+example if an array size is computed by an expression as in the
+following valid Go declarations:</p>
+<div class="sourceCode" id="cb4"><pre class="sourceCode go"><code class="sourceCode go"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="kw">const</span> <span class="op">(</span></span>
+<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a> prefix <span class="op">=</span> <span class="st">&quot;/usr&quot;</span></span>
+<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a> path <span class="op">=</span> prefix <span class="op">+</span> <span class="st">&quot;/local/bin&quot;</span></span>
+<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a><span class="op">)</span></span>
+<span id="cb4-5"><a href="#cb4-5" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> a <span class="op">[</span><span class="bu">len</span><span class="op">(</span>prefix<span class="op">+</span>path<span class="op">)</span> <span class="op">+</span> <span class="dv">2</span><span class="op">]</span><span class="dt">int</span></span></code></pre></div>
+<p>A paradox is that the compiler needs an interpreter to perform the
+type analysis! Indeed, in the example above, <code>[16]int</code>
+(because <code>len(prefix+path) + 2 = 16</code>) is a specific type in
+itself, distinct from e.g. <code>[14]int</code>. Which means that even
+though we are only at the types analysis phase we already must be able
+to compute the <code>len(prefix+path) + 2</code> expression. In the C
+language it is one of the roles of the <a
+href="https://gcc.gnu.org/onlinedocs/cpp/">pre-processor</a>, which
+means the compiler itself does not need to be able to achieve that. Here
+in Go, the specification forces the compiler implementor to provide and
+use early-on the mechanics involved above, which is usually called
+constant folding optimisation. It is therefore implemented both within
+the standard gc, and whithin yaegi. The same kind of approach is pushed
+to its paroxysm in the <a href="https://ziglang.org">Zig language</a>
+with its <a
+href="https://ziglang.org/documentation/master/#comptime">comptime</a>
+keyword.</p>
+<h3 id="control-flow-graphs">Control-flow graphs</h3>
+<p>After GTA, all the global symbols are properly defined no matter
+their declaration order. We can now proceed with the full code analysis,
+which will be performed by a single tree walk in <a
+href="https://github.com/traefik/yaegi/blob/master/interp/cfg.go">interp/cfg.go</a>.</p>
+<p>Both pre-processing and post-processing callbacks are provided to the
+walk function. Despite being activated in a single pass, multiple kinds
+of data processing are executed:</p>
+<ul>
+<li><p>Types checking and creation. Started in GTA, it is now completed
+also in all function bodies.</p></li>
+<li><p>Analysis of variable scoping: scope levels are opened in
+pre-processing and closed in post-processing, as the nesting of scope
+reflects the AST structure.</p></li>
+<li><p>Precise computing of object sizes and locations.</p></li>
+<li><p>Identification and ordering of actions.</p></li>
+</ul>
+<p>The last point is critical for code generation. It consists in the
+production of control-flow graphs. CFGs are usually represented in the
+form of an intermediate representation (IR), which really is a
+simplified machine independent instruction set, as in the <a
+href="https://gcc.gnu.org/onlinedocs/gccint/GIMPLE.html">GCC GIMPLE</a>,
+the <a href="https://llvm.org/docs/LangRef.html">LLVM IR</a> or the <a
+href="https://github.com/golang/go/blob/bf48163e8f2b604f3b9e83951e331cd11edd8495/src/cmd/compile/internal/ssa/README.md">SSA</a>
+form in the Go compiler. In yaegi, no IR is produced, only AST
+annotations are used.</p>
+<p>Let’s use our previous example to explain:</p>
+<figure>
+<img src="ex1_ast_cfg.drawio.svg" alt="figure 3: CFG is in AST" />
+<figcaption aria-hidden="true">figure 3: CFG is in AST</figcaption>
+</figure>
+<p>In the AST, the nodes relevant to the CFG are the <em>action</em>
+nodes (in blue), that is the nodes referring to an arithmetic or a logic
+operation, a function call or a memory operation (assigning a variable,
+accessing an array entry, …).</p>
+<p>Building the CFG consists in identifying action nodes and then find
+their successor (to be stored in node fields <code>tnext</code> and
+<code>fnext</code>). An action node has one successor in the general
+case (shown with a green arrow), or two if the action is associated to a
+conditional branch (green arrow if the test is true, red arrow
+otherwise).</p>
+<p>The rules to determine the successor of an action node are inherent
+to the properties of its neighbours (ancestors, siblings and
+descendants). For example, in the <code>if</code> sub-tree (nodes 5 to
+12), the first action to execute is the condition test, that is, the
+first action in the condition sub-tree, here the node 6. This action
+will have two alternative successors: one to execute if the test is
+true, the other if not. The <em>true</em> successor will be the first
+action in the second child sub-tree of the <code>if</code> node,
+describing the <em>true</em> branch (this sub-tree root is node 9, and
+first action 10). As there is no <code>if</code> <em>false</em> branch
+in our example, the next action of the whole <code>if</code> sub-tree is
+the first action in the <code>if</code> sibling sub-tree, here the node
+13. This node will be therefore the <em>false</em> successor, the first
+action to execute when the <code>if</code> condition fails. Finally the
+node 13 is also the successor of the <em>true</em> branch, the node 10.
+The corresponding implementation is located in a <a
+href="https://github.com/traefik/yaegi/blob/8de3add6faf471a807182c7b8198fe863debc9d8/interp/cfg.go#L1608-L1624">block
+of 16 lines</a> in the post-processing CFG callback. Note that the same
+code also performs dead branch elimination and condition validity
+checking. At this stage, in terms of Control Flow, our AST example can
+now be seen as a simpler representation, such as the following.</p>
+<figure>
+<img src="ex1_cfg.drawio.svg" alt="figure 4: the same CFG isolated" />
+<figcaption aria-hidden="true">figure 4: the same CFG
+isolated</figcaption>
+</figure>
+<p>In our example, the action nodes composing the CFG can do the
+following kind of operations: - defining variables in memory and
+assigning values to them - performing arithmetic or logical operations -
+conditional branching - function calling</p>
+<p>Adding the capacity to jump to a <em>backward</em> location (where
+destination node index is inferior to source’s one, an arrow from right
+to left), thus allowing <em>loops</em>, makes the action set to become
+<a href="https://en.wikipedia.org/wiki/Turing_completeness">Turing
+complete</a>, implementing a universal computing machine.</p>
+<figure>
+<img src="ex1_cfg_loop.drawio.svg" alt="figure 5: a CFG with a loop" />
+<figcaption aria-hidden="true">figure 5: a CFG with a loop</figcaption>
+</figure>
+<p>The character of universality here lies in the cyclic nature of the
+control-flow graph (remark that <code>if</code> statement graphs,
+although appearing cyclic, are not, because the conditional branches are
+mutually exclusives).</p>
+<p>This is not just theoretical. For example, forbidding backward jumps
+was crucial in the design of the Linux <a
+href="https://www.kernel.org/doc/html/latest/bpf/verifier.html">eBPF
+verifier</a>, in order to let user provided (therefore untrusted)
+snippets execute in a kernel system privileged environment and guarantee
+no infinite loops.</p>
+<h2 id="code-generation-and-execution">Code generation and
+execution</h2>
+<p>The compiler implemented in yaegi targets the Go runtime itself, not
+a particular hardware architecture. For each action node in the CFG a
+corresponding closure is generated. The main benefits are: -
+Portability: the generated code runs on any platform where Go is
+supported. - Interoperability: the objects produced by the interpreter
+are directly usable by the host program in the form of reflect values. -
+The memory management in particular the garbage collector, is provided
+by the runtime, and applies also to the values created by the
+interpreter. - The support of runtime type safety, slices, maps,
+channels, goroutines is also provided by the runtime.</p>
+<p>The action templates are located in <a
+href="https://github.com/traefik/yaegi/blob/master/interp/run.go">interp/run.go</a>
+and <a
+href="https://github.com/traefik/yaegi/blob/master/interp/op.go">interp/op.go</a>.
+Generating closures allows to optimize all the cases where a constant is
+used (an operation involving a constant and a variable is cheaper and
+faster than the same operation involving two variables). It also permits
+to hard-code the control-flow graph, that is to pre-define the next
+instruction to execute and avoid useless branch tests.</p>
+<p>The pseudo architecture targeted by the interpreter is in effect a
+virtual <a href="https://en.wikipedia.org/wiki/Stack_machine">stack
+machine</a> where the memory is represented as slices of Go reflect
+values, as shown in the following figure, and where the instructions are
+represented directly by the set of action nodes (the CFG) in the AST.
+Those atomic instructions, also called <em>builtins</em>, are sligthly
+higher level than a real hardware instruction set, because they operate
+directly on Go interfaces (more precisely their reflect representation),
+hiding a lot of low level processing and subtleties provided by the Go
+runtime.</p>
+<figure>
+<img src="frame1.drawio.svg" alt="figure 6: frame organization" />
+<figcaption aria-hidden="true">figure 6: frame organization</figcaption>
+</figure>
+<p>The memory management performed by the interpreter consists to create
+a global frame at a new session (the top of the stack), populated with
+all global values (constants, types, variables and functions). At each
+new interpreted function call, a new frame is pushed on the stack,
+containing the values for all the return value, input parameters and
+local variables of the function.</p>
+<h2 id="conclusion">Conclusion</h2>
+<p>We have described the general architecture of a Go interpreter,
+reusing the existing Go scanner and parser. We have focused on the
+semantic analysis, which is based on AST annotations, up to the
+control-flow graph and code generation. This design leads to a
+consistent and concise compiler suitable for an embedded interpreter. We
+have also provided a succint overview of the virtual stack machine on
+top of the Go runtime, leveraging on the reflection layer provided by
+the Go standard library.</p>
+<p>We can now evolve this design to address different target
+architectures, for example a more efficient virtual machine, already in
+the works.</p>
+<p>Some parts of yaegi have not been detailed yet and will be addressed
+in a next article:</p>
+<ul>
+<li>Integration with pre-compiled packages</li>
+<li>Go Generics</li>
+<li>Recursive types</li>
+<li>Interfaces and methods</li>
+<li>Virtualization and sandboxing</li>
+<li>REPL and interactive use</li>
+</ul>
+<hr>From: Marc Vertes, 03 may 2023
diff --git a/yaegi-internals/meta.sh b/yaegi-internals/meta.sh
new file mode 100644
index 0000000..4eef2a2
--- /dev/null
+++ b/yaegi-internals/meta.sh
@@ -0,0 +1,4 @@
+blog_title="Marc's Programming Notes"
+title="Yaegi Internals"
+author="Marc Vertes"
+date="03 may 2023"
diff --git a/yaegi-internals/readme.md b/yaegi-internals/readme.md
new file mode 100644
index 0000000..efa251d
--- /dev/null
+++ b/yaegi-internals/readme.md
@@ -0,0 +1,405 @@
+# Yaegi internals
+
+[Yaegi] is an interpreter of the Go language written in Go. This project
+was started in Traefik-Labs initially to provide a simple and practical
+embedded plugin engine for the traefik reverse proxy. Now, more than
+200 plugins contributed by the community are listed on the public
+catalog at [plugins.traefik.io]. The use of yaegi extends also to other
+domains, for example [databases], [observability], [container security]
+and many
+[others](https://github.com/traefik/yaegi/network/dependents?package_id=UGFja2FnZS0yMjc1NTQ3MjIy).
+
+Yaegi is lean and mean, as it delivers in a single package, with no
+external dependency, a complete Go interpreter, compliant with the [Go
+specification]. Lean, but also mean: its code is dense, complex, not
+always idiomatic, and sometimes maybe hard to understand.
+
+This document is here to address that. In the following, after getting
+an overview, we look under the hood, explore the internals and discuss
+the design. Our aim is to provide the essential insights, clarify the
+architecture and the code organization. But first, the overview.
+
+## Overview of architecture
+
+Let's see what happens inside yaegi when one executes the following
+line:
+
+```go
+interp.Eval(`print("hello", 2+3)`)
+```
+
+The following figure 1 displays the main steps of evaluation:
+
+![figure 1: steps of evaluation](yaegi_internals_fig1.drawio.svg)
+
+1. The *scanner* (provided by the [go/scanner] package) transforms a
+ stream of characters (the source code) into a stream of tokens,
+ through a [lexical analysis] step.
+
+2. The *parser* (provided by the [go/parser] package) transforms the
+ stream of tokens into an [abstract syntax tree] or AST, through a
+ [syntax analysis] step.
+
+3. The *analyser* (implemented in the [yaegi/interp] package) performs
+ the checks and creation of type, constant, variable and function
+ symbols. It also computes the [control-flow graphs] and memory
+ allocations for symbols, through [semantic analysis] steps. All those
+ metadata are obtained from and stored to the nodes of the AST, making
+ it annotated.
+
+4. The *generator* (implemented in the [yaegi/interp] package) reads the
+ annotated AST and produces code intructions to be executed, through a
+ [code generation] step.
+
+5. The *executor* (implemented in the [yaegi/interp] package) runs the
+ code instructions in the context of the interpreter.
+
+The interpreter is designed as a simple compiler, except that the code
+is generated into memory instead of object files, and with an executor
+module to run the specific instruction format.
+
+We won't spend more details on the scanner and the parser, both provided
+by the standard library, and instead examine directly the analyser.
+
+## Semantic analysis
+
+The analyser performs the semantic analysis of the program to interpret.
+This is done in several steps, all consisting of reading from and
+writing to the AST, so we first examine the details and dynamics of our
+AST representation.
+
+### AST dynamics
+
+Hereafter stands the most important data structure of any compiler,
+interpreter or other language tool, and the function to use it
+(extracted from
+[here](https://github.com/traefik/yaegi/blob/8de3add6faf471a807182c7b8198fe863debc9d8/interp/interp.go#L284-L296)).
+
+```go
+// node defines a node of a (abstract syntax) tree.
+type node struct {
+ // Node children
+ child []*node
+ // Node metadata
+ ...
+}
+
+// walk traverses AST n in depth first order, invoking in function
+// at node entry and out function at node exit.
+func (n *node) walk(in func(n *node) bool, out func(n *node)) {
+ if in != nil && !in(n) {
+ return
+ }
+ for _, child := range n.child {
+ child.Walk(in, out)
+ }
+ if out != nil {
+ out(n)
+ }
+}
+```
+
+The above code is deceptively simple. As in many complex systems, an
+important part of the signification is carried by the relationships
+between the elements and the patterns they form. It's easier to
+understand it by displaying the corresponding graph and consider the
+system as a whole. We can do that using a simple example:
+
+```go
+a := 3
+if a > 2 {
+ print("ok")
+}
+print("bye")
+```
+
+The corresponding AST is:
+
+![figure 2: a raw AST](ex1_raw_ast.drawio.svg)
+
+This is the raw AST, with no annotations, as obtained from the parser.
+Each node contains an index number (for labelling purpose only), and the
+node type, computed by the parser from the set of Go grammar rules (i.e.
+"stmt" for "list of [statements]", "call" for "call [expression]", ...).
+We also recognize the source tokens as literal values in leaf locations.
+
+Walking the tree consists in visiting the nodes starting from the root
+(node 1), in their numbering order (here from 1 to 15): depth first (the
+children before the siblings) and from left to right. At each node, a
+callback `in` is invoked at entry (pre-processing) and a callback `out`
+at exit (post-processing).
+
+When the `in` callback executes, only the information computed in the
+sub-trees in the left of the node is available, in addition to the
+pre-processing information computed in the node ancestors. The `in`
+callback returns a boolean. If the result is false, the node sub-tree is
+skipped, allowing to short-cut processing, for example to avoid to dive
+in function bodies and process only function signatures.
+
+When the `out` callback executes, the results computed on the whole
+descendant sub-trees are available, which is useful for example to
+compute the size of a composite object defined accross nested
+structures. In the absence of post-processing, multiple tree walks are
+necessary to achieve the same result.
+
+A semantic analysis step is therefore simply a tree walk with the right
+callbacks. In the case of our interpreter, we have two tree walks to
+perform: the globals and types analysis in [interp/gta.go] and the
+control-flow graphs analysis in [interp/cfg.go]. In both files, notice
+the call to `root.Walk`.
+
+Note: we have chosen to represent the AST as a uniform node structure
+as opposed to the [ast.Node] interface in the Go standard library,
+implemented by specialized types for all the node kinds. The main
+reason is that the tree walk method [ast.Inspect] only permits a
+pre-processing callback, not a post-processing one, required for
+several compiling steps. It also seemed simpler at the time to start
+with this uniform structure, and we ended up sticking with it.
+
+### Globals and types analysis
+
+Our first operation on the AST is to check and register all the
+components of the program declared at global level. This is a partial
+analysis, concerned only about declarations and not function
+implementations.
+
+This step is necessary because in Go, at global level, symbols can be
+used before being declared (as opposed to Go function bodies, or in C in
+general, where use before declaration is simply forbidden in strict
+mode).
+
+Allowing out of order symbols is what permits the code to be scattered
+arbitrarily amongst several files in packages without more constraints.
+It is indeed an important feature to let the programer organize her code
+as she wants.
+
+This step, implemented in [interp/gta.go], consists in performing a tree
+walk with only a pre-processing callback (no `out` function is passed).
+There are two particularities:
+
+The first is the multiple-pass iterative walk. Indeed, in a first global
+pass, instead of failing with an error whenever an incomplete definition
+is met, the reference to the failing sub-tree is kept in a list of nodes
+to be retried, and the walk finishes going over the whole tree. Then,
+all the problematic sub-trees are iteratively retried until all the
+nodes have been defined, or as long as there is progress. That is, if
+two subsequent iterations lead to the exact same state, it is a hint
+that progress is not being made and it would result in an infinite loop,
+at which point yaegi just stops with an error.
+
+The second particularity is that despite being in a partial analysis
+step, a full interpretation can still be necessary on an expression
+sub-tree if this one serves to implement a global type definition. For
+example if an array size is computed by an expression as in the
+following valid Go declarations:
+
+```go
+const (
+ prefix = "/usr"
+ path = prefix + "/local/bin"
+)
+var a [len(prefix+path) + 2]int
+```
+
+A paradox is that the compiler needs an interpreter to perform the type
+analysis! Indeed, in the example above, `[16]int` (because
+`len(prefix+path) + 2 = 16`) is a specific type in itself, distinct from
+e.g. `[14]int`. Which means that even though we are only at the types
+analysis phase we already must be able to compute the `len(prefix+path)
++ 2` expression. In the C language it is one of the roles of the
+[pre-processor], which means the compiler itself does not need to be
+able to achieve that. Here in Go, the specification forces the compiler
+implementor to provide and use early-on the mechanics involved above,
+which is usually called constant folding optimisation. It is therefore
+implemented both within the standard gc, and whithin yaegi. The same
+kind of approach is pushed to its paroxysm in the [Zig language] with
+its [comptime] keyword.
+
+### Control-flow graphs
+
+After GTA, all the global symbols are properly defined no matter
+their declaration order. We can now proceed with the full code
+analysis, which will be performed by a single tree walk in
+[interp/cfg.go].
+
+Both pre-processing and post-processing callbacks are provided to the
+walk function. Despite being activated in a single pass, multiple kinds
+of data processing are executed:
+
+- Types checking and creation. Started in GTA, it is now completed also
+ in all function bodies.
+
+- Analysis of variable scoping: scope levels are opened in
+ pre-processing and closed in post-processing, as the nesting of scope
+ reflects the AST structure.
+
+- Precise computing of object sizes and locations.
+
+- Identification and ordering of actions.
+
+The last point is critical for code generation. It consists in the
+production of control-flow graphs. CFGs are usually represented in the
+form of an intermediate representation (IR), which really is a
+simplified machine independent instruction set, as in the [GCC GIMPLE],
+the [LLVM IR] or the [SSA] form in the Go compiler. In yaegi, no IR is
+produced, only AST annotations are used.
+
+Let's use our previous example to explain:
+
+![figure 3: CFG is in AST](ex1_ast_cfg.drawio.svg)
+
+In the AST, the nodes relevant to the CFG are the *action* nodes (in
+blue), that is the nodes referring to an arithmetic or a logic
+operation, a function call or a memory operation (assigning a variable,
+accessing an array entry, ...).
+
+Building the CFG consists in identifying action nodes and then find
+their successor (to be stored in node fields `tnext` and `fnext`). An
+action node has one successor in the general case (shown with a green
+arrow), or two if the action is associated to a conditional branch
+(green arrow if the test is true, red arrow otherwise).
+
+The rules to determine the successor of an action node are inherent to
+the properties of its neighbours (ancestors, siblings and descendants).
+For example, in the `if` sub-tree (nodes 5 to 12), the first action to
+execute is the condition test, that is, the first action in the
+condition sub-tree, here the node 6. This action will have two
+alternative successors: one to execute if the test is true, the other
+if not. The *true* successor will be the first action in the second
+child sub-tree of the `if` node, describing the *true* branch (this
+sub-tree root is node 9, and first action 10). As there is no `if`
+*false* branch in our example, the next action of the whole `if`
+sub-tree is the first action in the `if` sibling sub-tree, here the node
+13. This node will be therefore the *false* successor, the first action
+to execute when the `if` condition fails. Finally the node 13 is also
+the successor of the *true* branch, the node 10. The corresponding
+implementation is located in a [block of 16 lines] in the
+post-processing CFG callback. Note that the same code also performs dead
+branch elimination and condition validity checking. At this stage, in
+terms of Control Flow, our AST example can now be seen as a simpler
+representation, such as the following.
+
+![figure 4: the same CFG isolated](ex1_cfg.drawio.svg)
+
+In our example, the action nodes composing the CFG can do the following
+kind of operations:
+- defining variables in memory and assigning values to them
+- performing arithmetic or logical operations
+- conditional branching
+- function calling
+
+Adding the capacity to jump to a *backward* location (where destination
+node index is inferior to source's one, an arrow from right to
+left), thus allowing *loops*, makes the action set to become
+[Turing complete], implementing a universal computing machine.
+
+![figure 5: a CFG with a loop](ex1_cfg_loop.drawio.svg)
+
+The character of universality here lies in the cyclic nature of the
+control-flow graph (remark that `if` statement graphs, although
+appearing cyclic, are not, because the conditional branches are
+mutually exclusives).
+
+This is not just theoretical. For example, forbidding backward jumps was
+crucial in the design of the Linux [eBPF verifier], in order to let user
+provided (therefore untrusted) snippets execute in a kernel system
+privileged environment and guarantee no infinite loops.
+
+## Code generation and execution
+
+The compiler implemented in yaegi targets the Go runtime itself, not a
+particular hardware architecture. For each action node in the CFG a
+corresponding closure is generated. The main benefits are:
+- Portability: the generated code runs on any platform where Go is
+ supported.
+- Interoperability: the objects produced by the interpreter are directly
+ usable by the host program in the form of reflect values.
+- The memory management in particular the garbage collector, is provided
+ by the runtime, and applies also to the values created by the
+ interpreter.
+- The support of runtime type safety, slices, maps, channels, goroutines
+ is also provided by the runtime.
+
+The action templates are located in [interp/run.go] and [interp/op.go].
+Generating closures allows to optimize all the cases where a constant is
+used (an operation involving a constant and a variable is cheaper and
+faster than the same operation involving two variables). It also permits
+to hard-code the control-flow graph, that is to pre-define the next
+instruction to execute and avoid useless branch tests.
+
+The pseudo architecture targeted by the interpreter is in effect a
+virtual [stack machine] where the memory is represented as slices of Go
+reflect values, as shown in the following figure, and where the
+instructions are represented directly by the set of action nodes (the
+CFG) in the AST. Those atomic instructions, also called *builtins*, are
+sligthly higher level than a real hardware instruction set, because they
+operate directly on Go interfaces (more precisely their reflect
+representation), hiding a lot of low level processing and subtleties
+provided by the Go runtime.
+
+![figure 6: frame organization](frame1.drawio.svg)
+
+The memory management performed by the interpreter consists to create a
+global frame at a new session (the top of the stack), populated with all
+global values (constants, types, variables and functions). At each new
+interpreted function call, a new frame is pushed on the stack,
+containing the values for all the return value, input parameters and
+local variables of the function.
+
+## Conclusion
+
+We have described the general architecture of a Go interpreter, reusing
+the existing Go scanner and parser. We have focused on the semantic
+analysis, which is based on AST annotations, up to the control-flow
+graph and code generation. This design leads to a consistent and
+concise compiler suitable for an embedded interpreter. We have also
+provided a succint overview of the virtual stack machine on top of the
+Go runtime, leveraging on the reflection layer provided by the Go
+standard library.
+
+We can now evolve this design to address different target architectures,
+for example a more efficient virtual machine, already in the works.
+
+Some parts of yaegi have not been detailed yet and will be addressed in
+a next article:
+
+- Integration with pre-compiled packages
+- Go Generics
+- Recursive types
+- Interfaces and methods
+- Virtualization and sandboxing
+- REPL and interactive use
+
+[Yaegi]: https://github.com/traefik/yaegi
+[plugins.traefik.io]: https://plugins.traefik.io
+[databases]: https://github.com/xo/xo
+[observability]: https://github.com/slok/sloth
+[container security]: https://github.com/cyberark/kubesploit
+[Go specification]: https://go.dev/ref/spec
+[go/scanner]: https://pkg.go.dev/go/scanner
+[go/parser]: https://pkg.go.dev/go/parser
+[abstract syntax tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
+[lexical analysis]: https://en.wikipedia.org/wiki/Lexical_analysis
+[syntax analysis]: https://en.wikipedia.org/wiki/Syntax_analysis
+[semantic analysis]: https://en.wikipedia.org/wiki/Semantic_analysis_(compilers)
+[control-flow graphs]: https://en.wikipedia.org/wiki/Control-flow_graph
+[yaegi/interp]: https://pkg.go.dev/github.com/traefik/yaegi/interp
+[code generation]: https://en.wikipedia.org/wiki/Code_generation_%28compiler%29
+[ast.Node]: https://pkg.go.dev/go/ast#Node
+[ast.Inspect]: https://pkg.go.dev/go/ast#Inspect
+[statements]: https://go.dev/ref/spec#Statements
+[expression]: https://go.dev/ref/spec#Expressions
+[Turing complete]: https://en.wikipedia.org/wiki/Turing_completeness
+[eBPF verifier]: https://www.kernel.org/doc/html/latest/bpf/verifier.html
+[interp/gta.go]: https://github.com/traefik/yaegi/blob/master/interp/gta.go
+[interp/cfg.go]: https://github.com/traefik/yaegi/blob/master/interp/cfg.go
+[interp/run.go]: https://github.com/traefik/yaegi/blob/master/interp/run.go
+[interp/op.go]: https://github.com/traefik/yaegi/blob/master/interp/op.go
+[pre-processor]: https://gcc.gnu.org/onlinedocs/cpp/
+[GCC GIMPLE]: https://gcc.gnu.org/onlinedocs/gccint/GIMPLE.html
+[LLVM IR]: https://llvm.org/docs/LangRef.html
+[SSA]: https://github.com/golang/go/blob/bf48163e8f2b604f3b9e83951e331cd11edd8495/src/cmd/compile/internal/ssa/README.md
+[block of 16 lines]: https://github.com/traefik/yaegi/blob/8de3add6faf471a807182c7b8198fe863debc9d8/interp/cfg.go#L1608-L1624
+[Zig language]: https://ziglang.org
+[comptime]: https://ziglang.org/documentation/master/#comptime
+[stack machine]: https://en.wikipedia.org/wiki/Stack_machine
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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 158px; height: 1px; padding-top: 65px; margin-left: 1px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;"><font face="Courier New">print("hello", 2+3)</font></div></div></div></foreignObject><text x="80" y="69" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">print("hello", 2+3)</text></switch></g></g><g id="cell-dklFw9bgWBskkmRMdnWt-86"><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 335px; margin-left: 561px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;"><font face="Courier New">hello5</font></div></div></div></foreignObject><text x="590" y="339" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">hello5</text></switch></g></g><g id="cell-dklFw9bgWBskkmRMdnWt-88"><path d="M 590 295 L 590 313.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="none"/><path d="M 590 318.88 L 586.5 311.88 L 590 313.63 L 593.5 311.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="none"/></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Text is not SVG - cannot display</text></a></switch></svg> \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-26 10:26:15 +0000