--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/api/tree/IRTranslator.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/api/tree/IRTranslator.java	Mon Sep 28 08:40:39 2015 +0200
@@ -47,7 +47,6 @@
 import jdk.nashorn.internal.ir.IfNode;
 import jdk.nashorn.internal.ir.IndexNode;
 import jdk.nashorn.internal.ir.LabelNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.ObjectNode;
@@ -64,7 +63,7 @@
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.Lexer;
 import jdk.nashorn.internal.parser.TokenType;
 
@@ -72,10 +71,9 @@
  * This class translates from nashorn IR Node objects
  * to nashorn parser API Tree objects.
  */
-final class IRTranslator extends NodeVisitor<LexicalContext> {
+final class IRTranslator extends SimpleNodeVisitor {
 
     public IRTranslator() {
-        super(new LexicalContext());
     }
 
     // currently translated Statement

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ApplySpecialization.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ApplySpecialization.java	Mon Sep 28 08:40:39 2015 +0200
@@ -41,9 +41,8 @@
 import jdk.nashorn.internal.ir.Expression;
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.IdentNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.Node;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.logging.DebugLogger;
@@ -81,7 +80,7 @@
  */
 
 @Logger(name="apply2call")
-public final class ApplySpecialization extends NodeVisitor<LexicalContext> implements Loggable {
+public final class ApplySpecialization extends SimpleNodeVisitor implements Loggable {
 
     private static final boolean USE_APPLY2CALL = Options.getBooleanProperty("nashorn.apply2call", true);
 
@@ -105,7 +104,6 @@
      * @param compiler compiler
      */
     public ApplySpecialization(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
         this.log = initLogger(compiler.getContext());
     }
@@ -138,7 +136,7 @@
 
     private boolean hasApplies(final FunctionNode functionNode) {
         try {
-            functionNode.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+            functionNode.accept(new SimpleNodeVisitor() {
                 @Override
                 public boolean enterFunctionNode(final FunctionNode fn) {
                     return fn == functionNode;
@@ -172,7 +170,7 @@
         final Deque<Set<Expression>> stack = new ArrayDeque<>();
 
         //ensure that arguments is only passed as arg to apply
-        functionNode.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        functionNode.accept(new SimpleNodeVisitor() {
 
             private boolean isCurrentArg(final Expression expr) {
                 return !stack.isEmpty() && stack.peek().contains(expr); //args to current apply call

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/AssignSymbols.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/AssignSymbols.java	Mon Sep 28 08:40:39 2015 +0200
@@ -67,7 +67,6 @@
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.IdentNode;
 import jdk.nashorn.internal.ir.IndexNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LexicalContextNode;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.Node;
@@ -81,7 +80,7 @@
 import jdk.nashorn.internal.ir.UnaryNode;
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WithNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.TokenType;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ECMAErrors;
@@ -102,7 +101,7 @@
  * visitor.
  */
 @Logger(name="symbols")
-final class AssignSymbols extends NodeVisitor<LexicalContext> implements Loggable {
+final class AssignSymbols extends SimpleNodeVisitor implements Loggable {
     private final DebugLogger log;
     private final boolean     debug;
 
@@ -150,7 +149,6 @@
     private final boolean isOnDemand;
 
     public AssignSymbols(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
         this.log   = initLogger(compiler.getContext());
         this.debug = log.isEnabled();
@@ -187,7 +185,7 @@
      */
     private void acceptDeclarations(final FunctionNode functionNode, final Block body) {
         // This visitor will assign symbol to all declared variables.
-        body.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        body.accept(new SimpleNodeVisitor() {
             @Override
             protected boolean enterDefault(final Node node) {
                 // Don't bother visiting expressions; var is a statement, it can't be inside an expression.

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CacheAst.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CacheAst.java	Mon Sep 28 08:40:39 2015 +0200
@@ -29,19 +29,17 @@
 import java.util.Collections;
 import java.util.Deque;
 import jdk.nashorn.internal.ir.FunctionNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.Statement;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.runtime.RecompilableScriptFunctionData;
 
-class CacheAst extends NodeVisitor<LexicalContext> {
+class CacheAst extends SimpleNodeVisitor {
     private final Deque<RecompilableScriptFunctionData> dataStack = new ArrayDeque<>();
 
     private final Compiler compiler;
 
     CacheAst(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
         assert !compiler.isOnDemandCompilation();
     }

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CodeGenerator.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CodeGenerator.java	Mon Sep 28 08:40:39 2015 +0200
@@ -129,7 +129,7 @@
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
 import jdk.nashorn.internal.ir.visitor.NodeOperatorVisitor;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Lexer.RegexToken;
 import jdk.nashorn.internal.parser.TokenType;
@@ -1433,8 +1433,7 @@
         final Block currentBlock = lc.getCurrentBlock();
         final CodeGeneratorLexicalContext codegenLexicalContext = lc;
 
-        function.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
-
+        function.accept(new SimpleNodeVisitor() {
             private MethodEmitter sharedScopeCall(final IdentNode identNode, final int flags) {
                 final Symbol symbol = identNode.getSymbol();
                 final boolean isFastScope = isFastScope(symbol);
@@ -2461,7 +2460,7 @@
 
             @Override
             public Boolean get() {
-                value.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+                value.accept(new SimpleNodeVisitor() {
                     @Override
                     public boolean enterFunctionNode(final FunctionNode functionNode) {
                         return false;
@@ -2799,7 +2798,7 @@
             boolean contains;
             @Override
             public Boolean get() {
-                rootExpr.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+                rootExpr.accept(new SimpleNodeVisitor() {
                     @Override
                     public boolean enterFunctionNode(final FunctionNode functionNode) {
                         return false;
@@ -4347,7 +4346,7 @@
              * on the stack throughout the store and used at the end to execute it
              */
 
-            target.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+            target.accept(new SimpleNodeVisitor() {
                 @Override
                 public boolean enterIdentNode(final IdentNode node) {
                     if (node.getSymbol().isScope()) {
@@ -4446,7 +4445,7 @@
              * need to do a conversion on non-equivalent types exists, but is
              * very rare. See for example test/script/basic/access-specializer.js
              */
-            target.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+            target.accept(new SimpleNodeVisitor() {
                 @Override
                 protected boolean enterDefault(final Node node) {
                     throw new AssertionError("Unexpected node " + node + " in store epilogue");

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CompilationPhase.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/CompilationPhase.java	Mon Sep 28 08:40:39 2015 +0200
@@ -36,13 +36,13 @@
 import jdk.nashorn.internal.codegen.Compiler.CompilationPhases;
 import jdk.nashorn.internal.ir.Block;
 import jdk.nashorn.internal.ir.FunctionNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.Symbol;
 import jdk.nashorn.internal.ir.debug.ASTWriter;
 import jdk.nashorn.internal.ir.debug.PrintVisitor;
 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.runtime.CodeInstaller;
 import jdk.nashorn.internal.runtime.RecompilableScriptFunctionData;
 import jdk.nashorn.internal.runtime.ScriptEnvironment;
@@ -118,7 +118,7 @@
             FunctionNode newFunctionNode;
 
             //ensure elementTypes, postsets and presets exist for splitter and arraynodes
-            newFunctionNode = transformFunction(fn, new NodeVisitor<LexicalContext>(new LexicalContext()) {
+            newFunctionNode = transformFunction(fn, new SimpleNodeVisitor() {
                 @Override
                 public LiteralNode<?> leaveLiteralNode(final LiteralNode<?> literalNode) {
                     return literalNode.initialize(lc);
@@ -222,7 +222,7 @@
             // correctness, it's just an optimization -- runtime type calculation is not used when the compilation
             // is not an on-demand optimistic compilation, so we can skip locals marking then.
             if (compiler.useOptimisticTypes() && compiler.isOnDemandCompilation()) {
-                fn.getBody().accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+                fn.getBody().accept(new SimpleNodeVisitor() {
                     @Override
                     public boolean enterFunctionNode(final FunctionNode functionNode) {
                         // OTOH, we must not declare symbols from nested functions to be locals. As we're doing on-demand

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/FindScopeDepths.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/FindScopeDepths.java	Mon Sep 28 08:40:39 2015 +0200
@@ -39,7 +39,7 @@
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.Symbol;
 import jdk.nashorn.internal.ir.WithNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.RecompilableScriptFunctionData;
 import jdk.nashorn.internal.runtime.logging.DebugLogger;
@@ -53,7 +53,7 @@
  * FunctionNode being compiled
  */
 @Logger(name="scopedepths")
-final class FindScopeDepths extends NodeVisitor<LexicalContext> implements Loggable {
+final class FindScopeDepths extends SimpleNodeVisitor implements Loggable {
 
     private final Compiler compiler;
     private final Map<Integer, Map<Integer, RecompilableScriptFunctionData>> fnIdToNestedFunctions = new HashMap<>();
@@ -66,7 +66,6 @@
     private int dynamicScopeCount;
 
     FindScopeDepths(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
         this.log      = initLogger(compiler.getContext());
     }
@@ -273,7 +272,7 @@
 
         //get all symbols that are referenced inside this function body
         final Set<Symbol> symbols = new HashSet<>();
-        block.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        block.accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterIdentNode(final IdentNode identNode) {
                 final Symbol symbol = identNode.getSymbol();

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/FoldConstants.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/FoldConstants.java	Mon Sep 28 08:40:39 2015 +0200
@@ -38,7 +38,6 @@
 import jdk.nashorn.internal.ir.Expression;
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.IfNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.LiteralNode.ArrayLiteralNode;
 import jdk.nashorn.internal.ir.Node;
@@ -47,7 +46,7 @@
 import jdk.nashorn.internal.ir.TernaryNode;
 import jdk.nashorn.internal.ir.UnaryNode;
 import jdk.nashorn.internal.ir.VarNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
@@ -59,12 +58,11 @@
  * Simple constant folding pass, executed before IR is starting to be lowered.
  */
 @Logger(name="fold")
-final class FoldConstants extends NodeVisitor<LexicalContext> implements Loggable {
+final class FoldConstants extends SimpleNodeVisitor implements Loggable {
 
     private final DebugLogger log;
 
     FoldConstants(final Compiler compiler) {
-        super(new LexicalContext());
         this.log = initLogger(compiler.getContext());
     }
 
@@ -194,7 +192,7 @@
      * initializers removed.
      */
     static void extractVarNodesFromDeadCode(final Node deadCodeRoot, final List<Statement> statements) {
-        deadCodeRoot.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        deadCodeRoot.accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterVarNode(final VarNode varNode) {
                 statements.add(varNode.setInit(null));

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/LocalVariableTypesCalculator.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/LocalVariableTypesCalculator.java	Mon Sep 28 08:40:39 2015 +0200
@@ -87,6 +87,7 @@
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.TokenType;
 
 /**
@@ -105,7 +106,7 @@
  * instances of the calculator to be run on nested functions (when not lazy compiling).
  *
  */
-final class LocalVariableTypesCalculator extends NodeVisitor<LexicalContext>{
+final class LocalVariableTypesCalculator extends SimpleNodeVisitor {
 
     private static class JumpOrigin {
         final JoinPredecessor node;
@@ -425,7 +426,6 @@
     private final Deque<Label> catchLabels = new ArrayDeque<>();
 
     LocalVariableTypesCalculator(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
     }
 
@@ -1330,7 +1330,7 @@
         // Sets the return type of the function and also performs the bottom-up pass of applying type and conversion
         // information to nodes as well as doing the calculation on nested functions as required.
         FunctionNode newFunction = functionNode;
-        final NodeVisitor<LexicalContext> applyChangesVisitor = new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        final SimpleNodeVisitor applyChangesVisitor = new SimpleNodeVisitor() {
             private boolean inOuterFunction = true;
             private final Deque<JoinPredecessor> joinPredecessors = new ArrayDeque<>();
 

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/Lower.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/Lower.java	Mon Sep 28 08:40:39 2015 +0200
@@ -74,7 +74,7 @@
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
 import jdk.nashorn.internal.ir.visitor.NodeOperatorVisitor;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.Token;
 import jdk.nashorn.internal.parser.TokenType;
 import jdk.nashorn.internal.runtime.Context;
@@ -331,7 +331,7 @@
 
     @SuppressWarnings("unchecked")
     private static <T extends Node> T ensureUniqueNamesIn(final T node) {
-        return (T)node.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        return (T)node.accept(new SimpleNodeVisitor() {
             @Override
             public Node leaveFunctionNode(final FunctionNode functionNode) {
                 final String name = functionNode.getName();
@@ -396,7 +396,7 @@
         final Block finallyBlock = createFinallyBlock(finallyBody);
         final ArrayList<Block> inlinedFinallies = new ArrayList<>();
         final FunctionNode fn = lc.getCurrentFunction();
-        final TryNode newTryNode = (TryNode)tryNode.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        final TryNode newTryNode = (TryNode)tryNode.accept(new SimpleNodeVisitor() {
 
             @Override
             public boolean enterFunctionNode(final FunctionNode functionNode) {
@@ -539,7 +539,7 @@
         final Block catchAll = catchAllBlock(tryNode);
 
         final List<ThrowNode> rethrows = new ArrayList<>(1);
-        catchAll.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        catchAll.accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterThrowNode(final ThrowNode throwNode) {
                 rethrows.add(throwNode);
@@ -686,7 +686,7 @@
     private static boolean controlFlowEscapes(final LexicalContext lex, final Block loopBody) {
         final List<Node> escapes = new ArrayList<>();
 
-        loopBody.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        loopBody.accept(new SimpleNodeVisitor() {
             @Override
             public Node leaveBreakNode(final BreakNode node) {
                 escapes.add(node);

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/OptimisticTypesCalculator.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/OptimisticTypesCalculator.java	Mon Sep 28 08:40:39 2015 +0200
@@ -42,7 +42,6 @@
 import jdk.nashorn.internal.ir.IfNode;
 import jdk.nashorn.internal.ir.IndexNode;
 import jdk.nashorn.internal.ir.JoinPredecessorExpression;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LoopNode;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.Optimistic;
@@ -52,7 +51,7 @@
 import jdk.nashorn.internal.ir.UnaryNode;
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WhileNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.TokenType;
 import jdk.nashorn.internal.runtime.ScriptObject;
 
@@ -61,7 +60,7 @@
  * must not ever be marked as optimistic, assigning narrowest non-invalidated types to program points from the
  * compilation environment, as well as initializing optimistic types of global properties for scripts.
  */
-final class OptimisticTypesCalculator extends NodeVisitor<LexicalContext> {
+final class OptimisticTypesCalculator extends SimpleNodeVisitor {
 
     final Compiler compiler;
 
@@ -69,7 +68,6 @@
     final Deque<BitSet> neverOptimistic = new ArrayDeque<>();
 
     OptimisticTypesCalculator(final Compiler compiler) {
-        super(new LexicalContext());
         this.compiler = compiler;
     }
 

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ProgramPoints.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ProgramPoints.java	Mon Sep 28 08:40:39 2015 +0200
@@ -37,25 +37,20 @@
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.IdentNode;
 import jdk.nashorn.internal.ir.IndexNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.Optimistic;
 import jdk.nashorn.internal.ir.UnaryNode;
 import jdk.nashorn.internal.ir.VarNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 
 /**
  * Find program points in the code that are needed for optimistic assumptions
  */
-class ProgramPoints extends NodeVisitor<LexicalContext> {
+class ProgramPoints extends SimpleNodeVisitor {
 
     private final IntDeque nextProgramPoint = new IntDeque();
     private final Set<Node> noProgramPoint = new HashSet<>();
 
-    ProgramPoints() {
-        super(new LexicalContext());
-    }
-
     private int next() {
         final int next = nextProgramPoint.getAndIncrement();
         if(next > MAX_PROGRAM_POINT_VALUE) {

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ReplaceCompileUnits.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/ReplaceCompileUnits.java	Mon Sep 28 08:40:39 2015 +0200
@@ -27,24 +27,19 @@
 
 import java.util.ArrayList;
 import java.util.List;
-
 import jdk.nashorn.internal.ir.CompileUnitHolder;
 import jdk.nashorn.internal.ir.FunctionNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.LiteralNode.ArrayLiteralNode;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.ObjectNode;
 import jdk.nashorn.internal.ir.Splittable;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 
 /**
  * Base class for a node visitor that replaces {@link CompileUnit}s in {@link CompileUnitHolder}s.
  */
-abstract class ReplaceCompileUnits extends NodeVisitor<LexicalContext> {
-    ReplaceCompileUnits() {
-        super(new LexicalContext());
-    }
+abstract class ReplaceCompileUnits extends SimpleNodeVisitor {
 
     /**
      * Override to provide a replacement for an old compile unit.

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/Splitter.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/Splitter.java	Mon Sep 28 08:40:39 2015 +0200
@@ -33,7 +33,6 @@
 import java.util.Map;
 import jdk.nashorn.internal.ir.Block;
 import jdk.nashorn.internal.ir.FunctionNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.LiteralNode.ArrayLiteralNode;
 import jdk.nashorn.internal.ir.Node;
@@ -42,7 +41,7 @@
 import jdk.nashorn.internal.ir.SplitNode;
 import jdk.nashorn.internal.ir.Splittable;
 import jdk.nashorn.internal.ir.Statement;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.logging.DebugLogger;
 import jdk.nashorn.internal.runtime.logging.Loggable;
@@ -53,7 +52,7 @@
  * Split the IR into smaller compile units.
  */
 @Logger(name="splitter")
-final class Splitter extends NodeVisitor<LexicalContext> implements Loggable {
+final class Splitter extends SimpleNodeVisitor implements Loggable {
     /** Current compiler. */
     private final Compiler compiler;
 
@@ -79,7 +78,6 @@
      * @param outermostCompileUnit  compile unit for outermost function, if non-lazy this is the script's compile unit
      */
     public Splitter(final Compiler compiler, final FunctionNode functionNode, final CompileUnit outermostCompileUnit) {
-        super(new LexicalContext());
         this.compiler             = compiler;
         this.outermost            = functionNode;
         this.outermostCompileUnit = outermostCompileUnit;
@@ -142,7 +140,7 @@
         final Block body = functionNode.getBody();
         final List<FunctionNode> dc = directChildren(functionNode);
 
-        final Block newBody = (Block)body.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        final Block newBody = (Block)body.accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterFunctionNode(final FunctionNode nestedFunction) {
                 return dc.contains(nestedFunction);
@@ -164,7 +162,7 @@
 
     private static List<FunctionNode> directChildren(final FunctionNode functionNode) {
         final List<FunctionNode> dc = new ArrayList<>();
-        functionNode.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        functionNode.accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterFunctionNode(final FunctionNode child) {
                 if (child == functionNode) {

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/debug/JSONWriter.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/debug/JSONWriter.java	Mon Sep 28 08:40:39 2015 +0200
@@ -49,7 +49,6 @@
 import jdk.nashorn.internal.ir.IndexNode;
 import jdk.nashorn.internal.ir.JoinPredecessorExpression;
 import jdk.nashorn.internal.ir.LabelNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LiteralNode;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.ObjectNode;
@@ -66,7 +65,7 @@
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.parser.JSONParser;
 import jdk.nashorn.internal.parser.Lexer.RegexToken;
 import jdk.nashorn.internal.parser.Parser;
@@ -78,7 +77,7 @@
 /**
  * This IR writer produces a JSON string that represents AST as a JSON string.
  */
-public final class JSONWriter extends NodeVisitor<LexicalContext> {
+public final class JSONWriter extends SimpleNodeVisitor {
 
     /**
      * Returns AST as JSON compatible string.
@@ -945,7 +944,6 @@
     // Internals below
 
     private JSONWriter(final boolean includeLocation) {
-        super(new LexicalContext());
         this.buf             = new StringBuilder();
         this.includeLocation = includeLocation;
     }

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/debug/PrintVisitor.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/debug/PrintVisitor.java	Mon Sep 28 08:40:39 2015 +0200
@@ -41,7 +41,6 @@
 import jdk.nashorn.internal.ir.JoinPredecessor;
 import jdk.nashorn.internal.ir.JoinPredecessorExpression;
 import jdk.nashorn.internal.ir.LabelNode;
-import jdk.nashorn.internal.ir.LexicalContext;
 import jdk.nashorn.internal.ir.LocalVariableConversion;
 import jdk.nashorn.internal.ir.Node;
 import jdk.nashorn.internal.ir.SplitNode;
@@ -53,7 +52,7 @@
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WhileNode;
 import jdk.nashorn.internal.ir.WithNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 
 /**
  * Print out the AST as human readable source code.
@@ -61,7 +60,7 @@
  *
  * see the flags --print-parse and --print-lower-parse
  */
-public final class PrintVisitor extends NodeVisitor<LexicalContext> {
+public final class PrintVisitor extends SimpleNodeVisitor {
     /** Tab width */
     private static final int TABWIDTH = 4;
 
@@ -96,7 +95,6 @@
      * @param printTypes        should we print optimistic and inferred types?
      */
     public PrintVisitor(final boolean printLineNumbers, final boolean printTypes) {
-        super(new LexicalContext());
         this.EOLN             = System.lineSeparator();
         this.sb               = new StringBuilder();
         this.printLineNumbers = printLineNumbers;

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/visitor/NodeOperatorVisitor.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/visitor/NodeOperatorVisitor.java	Mon Sep 28 08:40:39 2015 +0200
@@ -34,7 +34,7 @@
  * Like NodeVisitor but navigating further into operators.
  * @param <T> Lexical context class for this NodeOperatorVisitor
  */
-public class NodeOperatorVisitor<T extends LexicalContext> extends NodeVisitor<T> {
+public abstract class NodeOperatorVisitor<T extends LexicalContext> extends NodeVisitor<T> {
     /**
      * Constructor
      *

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/visitor/SimpleNodeVisitor.java	Mon Sep 28 08:40:39 2015 +0200
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.nashorn.internal.ir.visitor;
+
+import jdk.nashorn.internal.ir.LexicalContext;
+
+/**
+ * Convenience base class for a {@link NodeVisitor} with a plain {@link LexicalContext}.
+ */
+public abstract class SimpleNodeVisitor extends NodeVisitor<LexicalContext> {
+
+    /**
+     * Creates a new simple node visitor.
+     */
+    public SimpleNodeVisitor() {
+        super(new LexicalContext());
+    }
+}

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java	Wed Jul 05 20:51:37 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java	Mon Sep 28 08:40:39 2015 +0200
@@ -62,7 +62,7 @@
 import jdk.nashorn.internal.ir.SwitchNode;
 import jdk.nashorn.internal.ir.Symbol;
 import jdk.nashorn.internal.ir.TryNode;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
+import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor;
 import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Parser;
 import jdk.nashorn.internal.parser.Token;
@@ -518,8 +518,7 @@
         // don't cache non-split functions from the eager pass); those already cached, or those not split
         // don't need this step.
         final Set<Symbol> blockDefinedSymbols = fn.isSplit() && !cached ? Collections.newSetFromMap(new IdentityHashMap<>()) : null;
-        FunctionNode newFn = (FunctionNode)fn.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
-
+        FunctionNode newFn = (FunctionNode)fn.accept(new SimpleNodeVisitor() {
             private Symbol getReplacement(final Symbol original) {
                 if (original == null) {
                     return null;
@@ -757,7 +756,7 @@
 
     private FunctionNode extractFunctionFromScript(final FunctionNode script) {
         final Set<FunctionNode> fns = new HashSet<>();
-        script.getBody().accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
+        script.getBody().accept(new SimpleNodeVisitor() {
             @Override
             public boolean enterFunctionNode(final FunctionNode fn) {
                 fns.add(fn);