[Avrora] cfg/dot

[diz rael]

Having some difficulty with getting a cfg drawn. The
example given on the website crashes the dotty
renderer.

http://compilers.cs.ucla.edu/avrora/cfg.html

has a sample asm file, and the dot file generated is
shown below. Dotty/dot doesn't like the last but one
entry - the self-loop. The offender seems to be the
headport/tailport statement in the self-loop..
removing the port statements it makes it work alright.

Using dot version 2.2.1 (latest stable release)

digraph G {
    "0x0000 - \n0x0004" [shape=box];
    "0x0004 - \n0x0006" [shape=box];
    "0x0082 - \n0x0086" [shape=ellipse];
    "0x0086 - \n0x008E" [shape=ellipse];
    "0x008E - \n0x009C" [shape=ellipse];
    "0x009C - \n0x00A0" [shape=ellipse];
    "0x00A0 - \n0x00A4" [shape=ellipse];
    "0x00A4 - \n0x00A8" [shape=ellipse];
    "0x00A8 - \n0x00AC" [shape=ellipse];
    subgraph cluster0 {
        "0x00B4 - \n0x00B6"
[shape=hexagon,style=filled,fillcolor=aquamarine];
        "0x00AC - \n0x00B4"
[shape=doubleoctagon,style=filled,fillcolor=aquamarine];
    }
    "0x0086 - \n0x008E" -> "0x008E - \n0x009C"
[headport=s,tailport=n];
    "0x00A8 - \n0x00AC" -> "0x0082 - \n0x0086"
[headport=s,tailport=n];
    "0x009C - \n0x00A0" -> "0x008E - \n0x009C"
[headport=s,tailport=n];
    "0x00A0 - \n0x00A4" -> "0x00A4 - \n0x00A8"
[headport=s,tailport=n];
    "0x00A0 - \n0x00A4" -> "0x00AC - \n0x00B4"
[headport=s,tailport=n,color=red];
    "0x00A4 - \n0x00A8" -> "0x00A8 - \n0x00AC"
[headport=s,tailport=n];
    "0x00A4 - \n0x00A8" -> "0x00AC - \n0x00B4"
[headport=s,tailport=n,color=red];
    "0x0082 - \n0x0086" -> "0x0086 - \n0x008E"
[headport=s,tailport=n];
    "0x0082 - \n0x0086" -> "0x00AC - \n0x00B4"
[headport=s,tailport=n,color=red];
    "0x008E - \n0x009C" -> "0x009C - \n0x00A0"
[headport=s,tailport=n];
    "0x008E - \n0x009C" -> "0x00A0 - \n0x00A4"
[headport=s,tailport=n];
    "0x00AC - \n0x00B4" -> "0x00B4 - \n0x00B6"
[headport=s,tailport=n];
// Dot doesn't like ports on this node. Use next
statement:
//    "0x00AC - \n0x00B4" -> "0x00AC - \n0x00B4"
[headport=s,tailport=n];
    "0x00AC - \n0x00B4" -> "0x00AC - \n0x00B4";
    "0x0000 - \n0x0004" -> "0x0082 - \n0x0086"
[headport=s,tailport=n];
}




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