Backport changes in Chapter 5 to previous chapters and update Chapter5 documentation (#34)

* Backport changes from chapter 5 to older chapters (#30)

* Fix wrong indent

* Backport to chapter 4

* Backport to chapter 3

* Backport to chapter 2

* Backport to chapter 1

* Add if statement to comment (#32)

* Update visuals for chapters 1,2 & 3.
Reenable drawing of edges from constants to Start for these chapters.

* Update visuals for chapters 4.
Revise text to explain the labeling of edges in graphs and that we omit edge from Constant to Start nodes from chapter 4.

* Add code snippets for if statement parsing and the duplication and merging of ScopeNodes.
Explain how scopeNodes are duplicated and merged.

* Add constant check to minus node (#31)

* Fix closing root block with } (#33)

* Backport fix closing root block with } to chapter 4 and 3 (#35)

* Show use-def edge from Phi to Region as dotted edge.
Add example of Phi peephole.
Update visuals.
Add more examples.

* Fix visuals in chapter 1 and README in chapter 4.

* Remove subheading

* Adjust spaces

---------

Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com>

1 files changed, 27 insertions, 22 deletions

diff --git a/chapter03/docs/03-graph3.gv b/chapter03/docs/03-graph3.gv
index 717024e3..50cb6d27 100644
--- a/chapter03/docs/03-graph3.gv
+++ b/chapter03/docs/03-graph3.gv
@@ -1,32 +1,37 @@
 digraph chapter03 {
+/*
+int x0=1; int y0=2; int x1=3; int y1=4; return (x0-x1)*(x0-x1) + (y0-y1)*(y0-y1); #showGraph;
+*/
 	rankdir=BT;
+	ordering="in";
+	concentrate="true";
 	subgraph cluster_Nodes {
-		Start1 [ shape=box style=filled fillcolor=yellow label="Start" ];
-		Con_2 [ label="#1" ];
-		Con_3 [ label="#2" ];
-		Con_19 [ label="#8" ];
-		Con_4 [ label="#3" ];
-		Return20 [ shape=box style=filled fillcolor=yellow label="Return" ];
-		Con_5 [ label="#4" ];
+		Start2 [ shape=box style=filled fillcolor=yellow label="Start" ];
+		Con_3 [ label="#1" ];
+		Con_4 [ label="#2" ];
+		Con_20 [ label="#8" ];
+		Con_5 [ label="#3" ];
+		Return21 [ shape=box style=filled fillcolor=yellow label="Return" ];
+		Con_6 [ label="#4" ];
 	}
 	node [shape=plaintext];
-	subgraph cluster_0 {
-		scope0 [label=<
+	subgraph cluster_Scope1_0 {
+		Scope1_0 [label=<
 			<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
-			<TR><TD BGCOLOR="cyan">0</TD><TD PORT="scope0_y0">y0</TD><TD PORT="scope0_x0">x0</TD><TD PORT="scope0_y1">y1</TD><TD PORT="scope0_x1">x1</TD></TR>
+			<TR><TD BGCOLOR="cyan">0</TD><TD PORT="Scope1_0_y0">y0</TD><TD PORT="Scope1_0_x0">x0</TD><TD PORT="Scope1_0_y1">y1</TD><TD PORT="Scope1_0_x1">x1</TD></TR>
 			</TABLE>>];
 	}
-	Con_2 -> Start1 [style=dotted];
-	Con_3 -> Start1 [style=dotted];
-	Con_19 -> Start1 [style=dotted];
-	Con_4 -> Start1 [style=dotted];
-	Return20 -> Start1 [color=red];
-	Return20 -> Con_19;
-	Con_5 -> Start1 [style=dotted];
+	edge [ fontname=Helvetica, fontsize=8 ];
+	Con_3 -> Start2[taillabel=0 style=dotted];
+	Con_4 -> Start2[taillabel=0 style=dotted];
+	Con_20 -> Start2[taillabel=0 style=dotted];
+	Con_5 -> Start2[taillabel=0 style=dotted];
+	Return21 -> Start2[taillabel=0 color=red];
+	Return21 -> Con_20[taillabel=1];
+	Con_6 -> Start2[taillabel=0 style=dotted];
 	edge [style=dashed color=cornflowerblue];
-	scope0:scope0_y0 -> Con_3;
-	scope0:scope0_x0 -> Con_2;
-	scope0:scope0_y1 -> Con_5;
-	scope0:scope0_x1 -> Con_4;
+	Scope1_0:"Scope1_0_y0" -> Con_4;
+	Scope1_0:"Scope1_0_x0" -> Con_3;
+	Scope1_0:"Scope1_0_y1" -> Con_6;
+	Scope1_0:"Scope1_0_x1" -> Con_5;
 }
-