added section 3.2 and part of 3.3; changed language to en-GB

img/breakpdg.dot

@@ -1,22 +1,29 @@
 digraph g {
-	"f()" [shape=box, rank=min];
+	"f()" [shape=box, rank=min, style = filled];
 		// Rank adjustment
+		{ node [style=filled]
 		{ rank = same; "int a = 1"; "while (a > 0)"; }
+		"if (a > 10)"; break;
+		}
 		{ rank = same; "print(a)"; "a++"; }
 		{ rank = max; "a++"; "print(a)"; }
+		"a++" [style="filled,bold"];
 		// Control flow
-		"f()" -> "int a = 1" [style=bold];
-		"f()" -> "while (a > 0)" [style=bold];
-		"while (a > 0)" -> "if (a > 10)" [style=bold];
-		"if (a > 10)" -> "break" [style=bold];
-		"break" -> "print(a)" [style=bold];
-		"break" -> "a++" [style=bold];
-		"break" -> "while (a > 0)" [style=bold];
+		"f()" -> "while (a > 0)";
+		"f()" -> "int a = 1";
+		"while (a > 0)" -> "if (a > 10)";
+		"if (a > 10)" -> "break";
+		"break" -> "print(a)";
+		"break" -> "a++";
+		"break" -> "while (a > 0)";
 		// Data flow
-		"int a = 1" -> "while (a > 0)" [color=red];
-		"int a = 1" -> "if (a > 10)" [color=red];
-		"int a = 1" -> "print(a)" [color=red];
-		"a++" -> "a++" -> "while (a > 0)" [color=red];
-		"a++" -> "if (a > 10)" [color=red];
-		"a++" -> "print(a)" [color=red];
+		{ edge [color = red];
+			"int a = 1" -> "while (a > 0)";
+			"int a = 1" -> "if (a > 10)";
+			"int a = 1" -> "print(a)";
+			"a++" -> "a++";
+			"a++" -> "while (a > 0)";
+			"a++" -> "if (a > 10)";
+			"a++" -> "print(a)" [constraint = true];
+		}
 	}

img/throw-example-cfg.dot

@@ -1,8 +1,21 @@
 digraph g {
-	Start [shape=box];
+	Start [shape=box,label=<Start<br/>x = x_in>];
 	End [shape=box];
 	Start -> End [style=dashed];
 	Start -> "if (x < 0)" -> "throw" -> "Error exit" -> End;
 	"throw" -> "return Math.sqrt(x)" [style=dashed];
 	"if (x < 0)" -> "return Math.sqrt(x)" -> "Normal exit" -> End;
-}
+	// pdg
+	f [label="f()",shape=rect];
+	x_in [label = "x = x_in", style = dashed];
+	if [label = "if (x < 0)"];
+	t [label = "throw"];
+	ret [label = "return Math.sqrt(x)"];
+	ee [label = "error exit", style = dashed];
+	ne [label = "normal exit", style = dashed];
+	f -> x_in;
+	f -> if -> t -> {ret ee ne};
+	{ edge [color = red, constraint = false];
+		x_in -> {if ret};
+	}
+}