2 files changed, 5 insertions, 2 deletions
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java b/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
index 43501a9b..32c41b16 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/codegen/CodeGen.java
@@ -12,6 +12,7 @@ import java.util.IdentityHashMap;
 
 @SuppressWarnings("unchecked")
 public class CodeGen {
+    public static final String PORTS = "com.seaofnodes.simple.node.cpus";
     // Last created CodeGen as a global; used all over to avoid passing about a
     // "context".
     public static CodeGen CODE;
@@ -181,7 +182,8 @@ public class CodeGen {
 
     // Convert to target hardware nodes
     public int _tInsSel;
-    public CodeGen instSelect( String base, String cpu, String callingConv ) {
+    public CodeGen instSelect( String cpu, String callingConv ) { return instSelect(cpu,callingConv,PORTS); }
+    public CodeGen instSelect( String cpu, String callingConv, String base ) {
         assert _phase.ordinal() <= Phase.TypeCheck.ordinal();
         _phase = Phase.InstSelect;
 
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/codegen/ElfFile.java b/chapter21/src/main/java/com/seaofnodes/simple/codegen/ElfFile.java
index 32fd99a8..6aed0fae 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/codegen/ElfFile.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/codegen/ElfFile.java
@@ -351,7 +351,8 @@ public class ElfFile {
         assert out.position() == size;
 
         File file = new File(fname);
-        file.getParentFile().mkdirs();
+        if( file.getParentFile()!=null )
+          file.getParentFile().mkdirs();
         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
         bos.write(out.array());
         bos.close();