From 1326e3b6cc48632ee00aa8ea333fa034623171cd Mon Sep 17 00:00:00 2001
From: ChUrl <tobi@urpost.de>
Date: Sat, 30 Jan 2021 16:59:31 +0100
Subject: [PATCH] fix printing bug when graph empty

---
 src/main/java/codegen/analysis/dataflow/DataFlowGraph.java | 4 ++++
 src/main/java/codegen/flowgraph/FlowGraph.java             | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/src/main/java/codegen/analysis/dataflow/DataFlowGraph.java b/src/main/java/codegen/analysis/dataflow/DataFlowGraph.java
index bd7e6a1..b3f92e9 100644
--- a/src/main/java/codegen/analysis/dataflow/DataFlowGraph.java
+++ b/src/main/java/codegen/analysis/dataflow/DataFlowGraph.java
@@ -73,6 +73,10 @@ public final class DataFlowGraph {
     // Printing
 
     public String printToImage() {
+        if (this.graph.isEmpty()) {
+            return "Empty Graph";
+        }
+
         final StringBuilder dot = new StringBuilder();
 
         dot.append("digraph dfd {\n")
diff --git a/src/main/java/codegen/flowgraph/FlowGraph.java b/src/main/java/codegen/flowgraph/FlowGraph.java
index 740dd44..6b9786e 100644
--- a/src/main/java/codegen/flowgraph/FlowGraph.java
+++ b/src/main/java/codegen/flowgraph/FlowGraph.java
@@ -153,6 +153,10 @@ public class FlowGraph {
     }
 
     public String printToImage() {
+        if (this.basicBlocks.isEmpty()) {
+            return "Empty Graph";
+        }
+
         final StringBuilder dot = new StringBuilder();
 
         dot.append("digraph dfd {\n")