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authorCliff Click <cliffc@acm.org>2023-10-27 20:35:04 +0100
committerCliff Click <cliffc@acm.org>2026-10-08 16:52:27 -0700
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Chapter 5: If Statement, Phi, and Region
Co-authored-by: Dibyendu Majumdar <mobile@majumdar.org.uk> Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com> Co-authored-by: Yichen Yan <oraluben@outlook.com> Co-authored-by: Thalia Archibald <thalia@archibald.dev> Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com> Co-authored-by: Tamas Hadhazy <helsgithub15@gmail.com> Co-authored-by: Symious <14933944+symious@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: tannal <tannal2409@gmail.com> Co-authored-by: hadha <helsgithub15@gmail.com> Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com> Co-authored-by: Tamás Hadházy <85063808+Hels15@users.noreply.github.com> Co-authored-by: RobertObkircher <robert.obkircher@gmail.com> Co-authored-by: Jun Kawasaki <jun784@gmail.com> Co-authored-by: David Rubin <87927264+Rexicon226@users.noreply.github.com>
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+digraph chapter05 {
+/*
+int a = 1;
+if (arg == 1)
+ a = arg+2;
+else {
+ a = arg-3;
+
+}
+
+return a;
+*/
+ rankdir=BT;
+ ordering="in";
+ concentrate="true";
+ subgraph cluster_Nodes {
+ Start2 [ shape=plaintext label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+ <TR><TD BGCOLOR="yellow">Start</TD></TR>
+ <TR><TD>
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD PORT="p0" BGCOLOR="yellow">$ctrl</TD><TD PORT="p1">arg</TD></TR>
+ </TABLE>
+ </TD></TR>
+ </TABLE>>
+ ];
+ Stop3 [ shape=box style=filled fillcolor=yellow label="Stop" ];
+ Con_7 [ label="#1" ];
+ EQNode8 [ label="==" ];
+ If9 [ shape=plaintext label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+ <TR><TD BGCOLOR="yellow">If</TD></TR>
+ <TR><TD>
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD PORT="p0" BGCOLOR="yellow">True</TD><TD PORT="p1" BGCOLOR="yellow">False</TD></TR>
+ </TABLE>
+ </TD></TR>
+ </TABLE>>
+ ];
+ Con_13 [ label="#2" ];
+ Add14 [ label="+" ];
+ Con_15 [ label="#3" ];
+ Sub16 [ label="-" ];
+ Region17 [ shape=box style=filled fillcolor=yellow label="Region" ];
+ Phi_a18 [ style=filled fillcolor=lightyellow label="&phi;_a" ];
+ Return19 [ shape=box style=filled fillcolor=yellow label="Return" ];
+ { rank=same; Region17;Phi_a18;}
+ }
+ edge [ fontname=Helvetica, fontsize=8 ];
+ Stop3 -> Return19[taillabel=0 color=red];
+ EQNode8 -> Start2:p1[taillabel=1];
+ EQNode8 -> Con_7[taillabel=2];
+ If9 -> Start2:p0[taillabel=0 color=red];
+ If9 -> EQNode8[taillabel=1];
+ Add14 -> Start2:p1[taillabel=1];
+ Add14 -> Con_13[taillabel=2];
+ Sub16 -> Start2:p1[taillabel=1];
+ Sub16 -> Con_15[taillabel=2];
+ Region17 -> If9:p0[taillabel=1 color=red];
+ Region17 -> If9:p1[taillabel=2 color=red];
+ Phi_a18 -> Region17 [style=dotted taillabel=0];
+ Phi_a18 -> Add14[taillabel=1];
+ Phi_a18 -> Sub16[taillabel=2];
+ Return19 -> Region17[taillabel=0 color=red];
+ Return19 -> Phi_a18[taillabel=1];
+}