support for method argument default values

com.ibm.wala.cast.js/source/com/ibm/wala/cast/js/ipa/callgraph/correlations/extraction/ClosureExtractor.java

@@ -562,6 +562,10 @@ public class ClosureExtractor extends CAstRewriterExt {
       public CAstNodeTypeMap newTypes() { return theTypes; }
       @Override
       public Map<CAstNode, Collection<CAstEntity>> newChildren() { return theChildren; }
+      @Override
+      public CAstNode[] newDefaults() {
+        return null;
+      }
     };
     new_entity.setRewrite(rw);
 

com.ibm.wala.cast/source/java/com/ibm/wala/cast/ir/translator/AstTranslator.java

@@ -815,7 +815,8 @@ public abstract class AstTranslator extends CAstVisitor<AstTranslator.WalkContex
                 }
               }
             }).copy(sourceContext.unwindAst, sourceContext.astContext.getControlFlow(), sourceContext.astContext.getSourceMap(),
-                sourceContext.astContext.top().getNodeTypeMap(), sourceContext.astContext.top().getAllScopedEntities());
+                sourceContext.astContext.top().getNodeTypeMap(), sourceContext.astContext.top().getAllScopedEntities(), 
+                sourceContext.astContext.top().getArgumentDefaults());
             sourceContext.astVisitor.visit(ast.newRoot(), new DelegatingContext(sourceContext.astContext) {
               @Override
               public CAstSourcePositionMap getSourceMap() {

com.ibm.wala.cast/source/java/com/ibm/wala/cast/ir/translator/TranslatorToCAst.java

@@ -296,7 +296,7 @@ public interface TranslatorToCAst {
       if (replicateForDoLoops) {
         loopBody = Ast.makeNode(CAstNode.BLOCK_STMT, loopBody, continueNode);
         
-        CAstRewriter.Rewrite x = (new CAstCloner(Ast, false)).copy(loopBody, wc.cfg(), wc.pos(), wc.getNodeTypeMap(), null);
+        CAstRewriter.Rewrite x = (new CAstCloner(Ast, false)).copy(loopBody, wc.cfg(), wc.pos(), wc.getNodeTypeMap(), null, null);
         CAstNode otherBody = x.newRoot();
         
         wc.cfg().addAll(x.newCfg());

com.ibm.wala.cast/source/java/com/ibm/wala/cast/tree/rewrite/AstConstantFolder.java

@@ -46,7 +46,7 @@ public class AstConstantFolder {
           }
         } 
         
-      }.rewrite(ce.getAST(), ce.getControlFlow(), ce.getSourceMap(), ce.getNodeTypeMap(), ce.getAllScopedEntities());
+      }.rewrite(ce.getAST(), ce.getControlFlow(), ce.getSourceMap(), ce.getNodeTypeMap(), ce.getAllScopedEntities(), ce.getArgumentDefaults());
       return new DelegatingEntity(ce) {
 
         @Override

com.ibm.wala.cast/source/java/com/ibm/wala/cast/tree/rewrite/CAstCloner.java

@@ -62,7 +62,7 @@ public class CAstCloner extends CAstBasicRewriter<CAstBasicRewriter.NonCopyingCo
   }
 
   public Rewrite copy(CAstNode root, final CAstControlFlowMap cfg, final CAstSourcePositionMap pos, final CAstNodeTypeMap types,
-      final Map<CAstNode, Collection<CAstEntity>> children) {
+      final Map<CAstNode, Collection<CAstEntity>> children, CAstNode[] defaults) {
-    return rewrite(root, cfg, pos, types, children);
+    return rewrite(root, cfg, pos, types, children, defaults);
   }
 }

com.ibm.wala.cast/source/java/com/ibm/wala/cast/tree/rewrite/CAstRewriter.java

@@ -100,6 +100,7 @@ public abstract class CAstRewriter<C extends CAstRewriter.RewriteContext<K>, K e
 
     Map<CAstNode, Collection<CAstEntity>> newChildren();
 
+    CAstNode[] newDefaults();
   }
 
   protected final CAst Ast;
@@ -342,9 +343,14 @@ public abstract class CAstRewriter<C extends CAstRewriter.RewriteContext<K>, K e
    * rewrite the CAst sub-tree rooted at root
    */
   public Rewrite rewrite(final CAstNode root, final CAstControlFlowMap cfg, final CAstSourcePositionMap pos, final CAstNodeTypeMap types,
-      final Map<CAstNode, Collection<CAstEntity>> children) {
+      final Map<CAstNode, Collection<CAstEntity>> children, final CAstNode[] defaults) {
     final Map<Pair<CAstNode, K>, CAstNode> nodes = HashMapFactory.make();
     final CAstNode newRoot = copyNodes(root, cfg, rootContext, nodes);
+    final CAstNode newDefaults[] = new CAstNode[ defaults==null? 0: defaults.length ];
+    for(int i = 0; i < newDefaults.length; i++) {
+        newDefaults[i] = copyNodes(defaults[i], cfg, rootContext, nodes);
+    }
+
     return new Rewrite() {
       private CAstControlFlowMap theCfg = null;
 
@@ -354,6 +360,11 @@ public abstract class CAstRewriter<C extends CAstRewriter.RewriteContext<K>, K e
 
       private Map<CAstNode, Collection<CAstEntity>> theChildren = null;
 
+      @Override
+      public CAstNode[] newDefaults() {
+         return newDefaults;
+      }
+
       @Override
       public CAstNode newRoot() {
         return newRoot;
@@ -397,7 +408,7 @@ public abstract class CAstRewriter<C extends CAstRewriter.RewriteContext<K>, K e
 
     if (root.getAST() != null) {
       final Rewrite rewrite = rewrite(root.getAST(), root.getControlFlow(), root.getSourceMap(), root.getNodeTypeMap(),
-          root.getAllScopedEntities());
+          root.getAllScopedEntities(), root.getArgumentDefaults());
 
       return new DelegatingEntity(root) {
         @Override
@@ -439,6 +450,11 @@ public abstract class CAstRewriter<C extends CAstRewriter.RewriteContext<K>, K e
         public CAstControlFlowMap getControlFlow() {
           return rewrite.newCfg();
         }
+
+        @Override
+        public CAstNode[] getArgumentDefaults() {
+          return rewrite.newDefaults();
+        }
       };
 
     } else if (recursive) {

com.ibm.wala.cast/source/java/com/ibm/wala/cast/tree/visit/CAstVisitor.java

@@ -184,6 +184,10 @@ public abstract class CAstVisitor<C extends CAstVisitor.Context> {
       break;
     }
     case CAstEntity.FUNCTION_ENTITY: {
+      for(CAstNode dflt : n.getArgumentDefaults()) {
+        visitor.visit(dflt, context, visitor);
+        visitor.visitScopedEntities(context.top(), context.top().getScopedEntities(dflt), context, visitor);
+      }
       C codeContext = visitor.makeCodeContext(context, n);
       if (visitor.visitFunctionEntity(n, context, codeContext, visitor))
         break;

com.ibm.wala.core/src/com/ibm/wala/classLoader/IMethod.java

@@ -160,4 +160,9 @@ public interface IMethod extends IMember, ContextItem {
    * @return true iff the local variable table information for this method is available
    */
   boolean hasLocalVariableTable();
+  
+  default int getNumberOfDefaultParameters() {
+    return 0;
+  }
+
 }