Add a placeholder instruction

src/de/inetsoftware/jwebassembly/module/WasmNopInstruction.java

@@ -0,0 +1,47 @@
+/*
+   Copyright 2018 Volker Berlin (i-net software)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+*/
+package de.inetsoftware.jwebassembly.module;
+
+import java.io.IOException;
+
+import javax.annotation.Nonnull;
+
+/**
+ * WasmInstruction for nop.
+ * 
+ * @author Volker Berlin
+ *
+ */
+class WasmNopInstruction extends WasmInstruction {
+
+    /**
+     * Create an instance of a nop instruction
+     * 
+     * @param javaCodePos
+     *            the code position/offset in the Java method
+     */
+    WasmNopInstruction( int javaCodePos ) {
+        super( javaCodePos );
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void writeTo( @Nonnull ModuleWriter writer ) throws IOException {
+        // nothing
+    }
+}