share the LocaleVariableManager between multiple WasmCodeBuilder

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

@@ -50,6 +50,16 @@ class JavaMethodWasmCodeBuilder extends WasmCodeBuilder {
 
     private BranchManager branchManager;
 
+    /**
+     * Create an instance
+     * 
+     * @param codeBuilder
+     *            other code builder for shred references
+     */
+    JavaMethodWasmCodeBuilder( @Nonnull WasmCodeBuilder codeBuilder ) {
+        super( codeBuilder );
+    }
+
     /**
      * {@inheritDoc}
      */

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

@@ -91,8 +91,8 @@ public class ModuleGenerator {
      *            libraries 
      */
     public ModuleGenerator( @Nonnull ModuleWriter writer, WasmTarget target, @Nonnull List<URL> libraries ) {
-        this.javaCodeBuilder = new JavaMethodWasmCodeBuilder();
         this.watParser = new WatParser();
+        this.javaCodeBuilder = new JavaMethodWasmCodeBuilder( watParser );
         this.writer = writer;
         this.javaScript = new JavaScriptWriter( target );
         this.classFileLoader = new ClassFileLoader( new URLClassLoader( libraries.toArray( new URL[libraries.size()] ) ) );

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

@@ -57,9 +57,9 @@ import de.inetsoftware.jwebassembly.wasm.WasmBlockOperator;
  */
 public abstract class WasmCodeBuilder {
 
-    private final LocaleVariableManager localVariables = new LocaleVariableManager();
+    private final LocaleVariableManager localVariables;
 
-    private final List<WasmInstruction> instructions   = new ArrayList<>();
+    private final List<WasmInstruction> instructions;
 
     private TypeManager                 types;
 
@@ -71,6 +71,25 @@ public abstract class WasmCodeBuilder {
 
     private ClassFileLoader             classFileLoader;
 
+    /**
+     * Create a new instance of CodeBuilder
+     */
+    protected WasmCodeBuilder() {
+        localVariables = new LocaleVariableManager();
+        instructions = new ArrayList<>();
+    }
+
+    /**
+     * Create a new instance with shared resources
+     * 
+     * @param codeBuilder
+     *            other instance of CodeBuilder
+     */
+    WasmCodeBuilder( @Nonnull WasmCodeBuilder codeBuilder ) {
+        localVariables = codeBuilder.localVariables;
+        instructions = codeBuilder.instructions;
+    }
+
     /**
      * Initialize the code builder;
      *