Support for function argument resolution in env.findLocalScopes

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/PythonLanguage.java

@@ -65,6 +65,7 @@
 import com.oracle.graal.python.runtime.PythonParser.ParserMode;
 import com.oracle.graal.python.runtime.exception.PException;
 import com.oracle.graal.python.runtime.interop.InteropMap;
+import com.oracle.graal.python.util.PFunctionArgsFinder;
 import com.oracle.truffle.api.Assumption;
 import com.oracle.truffle.api.CallTarget;
 import com.oracle.truffle.api.CompilerAsserts;
@@ -359,8 +360,21 @@ protected boolean isVisible(PythonContext context, Object value) {
     protected Iterable<Scope> findLocalScopes(PythonContext context, Node node, Frame frame) {
         ArrayList<Scope> scopes = new ArrayList<>();
         for (Scope s : super.findLocalScopes(context, node, frame)) {
-            scopes.add(s);
+            if (frame == null) {
+                PFunctionArgsFinder argsFinder = new PFunctionArgsFinder(node);
+
+                Scope.Builder scopeBuilder = Scope.newBuilder(s.getName(), s.getVariables())
+                        .node(s.getNode())
+                        .receiver(s.getReceiverName(), s.getReceiver())
+                        .rootInstance(s.getRootInstance())
+                        .arguments(argsFinder.collectArgs());
+
+                scopes.add(scopeBuilder.build());
+            } else {
+                scopes.add(s);
+            }
         }
+
         if (frame != null) {
             PythonObject globals = PArguments.getGlobalsSafe(frame);
             if (globals != null) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/util/PFunctionArgsFinder.java

@@ -0,0 +1,62 @@
+package com.oracle.graal.python.util;
+
+import com.oracle.graal.python.nodes.PRootNode;
+import com.oracle.graal.python.nodes.argument.ReadArgumentNode;
+import com.oracle.graal.python.nodes.frame.WriteIdentifierNode;
+import com.oracle.graal.python.runtime.interop.InteropArray;
+import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
+import com.oracle.truffle.api.interop.InteropLibrary;
+import com.oracle.truffle.api.interop.TruffleObject;
+import com.oracle.truffle.api.library.ExportLibrary;
+import com.oracle.truffle.api.library.ExportMessage;
+import com.oracle.truffle.api.nodes.Node;
+import com.oracle.truffle.api.nodes.NodeUtil;
+import com.oracle.truffle.api.nodes.RootNode;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class PFunctionArgsFinder {
+    private final RootNode rootNode;
+
+    public PFunctionArgsFinder(Node node) {
+        this.rootNode = node.getRootNode();
+        assert rootNode instanceof PRootNode;
+    }
+
+    public ArgumentListObject collectArgs() {
+        List<String> arguments = new LinkedList<>();
+
+        NodeUtil.findAllNodeInstances(rootNode, ReadArgumentNode.class).forEach(readArgumentNode -> {
+            WriteIdentifierNode identifierNode = NodeUtil.findParent(readArgumentNode, WriteIdentifierNode.class);
+            if (identifierNode != null) {
+                arguments.add(identifierNode.getIdentifier().toString());
+            }
+        });
+
+        return new ArgumentListObject(arguments.toArray(new String[0]));
+    }
+
+    @ExportLibrary(InteropLibrary.class)
+    static final class ArgumentListObject implements TruffleObject {
+        final String[] args;
+
+        private ArgumentListObject(String[] args) {
+            this.args = args;
+        }
+
+        @SuppressWarnings("unused")
+        @ExportMessage
+        boolean hasMembers() {
+            return true;
+        }
+
+        @SuppressWarnings("unused")
+        @ExportMessage
+        @TruffleBoundary
+        Object getMembers(boolean includeInternal) {
+            return new InteropArray(args);
+        }
+    }
+
+}