From 1b09c5fd8cc2cc864cc784917e3a67b5600145ce Mon Sep 17 00:00:00 2001
From: Volker Berlin <volker.berlin@googlemail.com>
Date: Fri, 14 Dec 2018 20:47:53 +0100
Subject: [PATCH] implements ref.null

---
 .../binary/BinaryModuleWriter.java            |  8 ++++++-
 .../jwebassembly/text/TextModuleWriter.java   | 23 +++++++++++++++----
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java b/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
index 990686e..48162fe 100644
--- a/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
+++ b/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
@@ -826,10 +826,16 @@ public class BinaryModuleWriter extends ModuleWriter implements InstructionOpcod
             case SET:
                 opCode = STRUCT_SET;
                 break;
+            case NULL:
+                opCode = REF_NULL;
+                type = null;
+                break;
             default:
                 throw new Error( "Unknown operator: " + op );
         }
         codeStream.writeOpCode( opCode );
-        codeStream.writeValueType( type );
+        if( type != null ) {
+            codeStream.writeValueType( type );
+        }
     }
 }
diff --git a/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java b/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
index 0d21e16..7bdbcf7 100644
--- a/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
+++ b/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
@@ -400,21 +400,34 @@ public class TextModuleWriter extends ModuleWriter {
         String operation;
         switch( op ) {
             case NEW:
-                operation = "new";
+                operation = "struct.new";
                 break;
             case NEW_DEFAULT:
-                operation = "new_default";
+                operation = "struct.new_default";
                 break;
             case GET:
-                operation = "get";
+                operation = "struct.get";
                 break;
             case SET:
-                operation = "set";
+                operation = "struct.set";
+                break;
+            case NULL:
+                operation = "ref.null";
+                type = null;
                 break;
             default:
                 throw new Error( "Unknown operator: " + op );
         }
         newline( methodOutput );
-        methodOutput.append( "struct." ).append( operation ).append( ' ' ).append( type );
+        methodOutput.append( operation );
+        if( type != null ) {
+            int typeCode = type.getCode();
+            methodOutput.append( ' ' );
+            if( typeCode < 0 ) {
+                methodOutput.append( type );
+            } else {
+                methodOutput.append( typeCode );
+            }
+        }
     }
 }