Adds support of object's fields in debugger watches

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/ChromeRDPDebugger.java

@@ -63,11 +63,14 @@ public class ChromeRDPDebugger implements JavaScriptDebugger, ChromeRDPExchangeC
     private ChromeRDPExchangeListener exchangeListener = new ChromeRDPExchangeListener() {
         @Override public void received(String messageText) throws IOException {
             JsonNode jsonMessage = mapper.readTree(messageText);
-            if (jsonMessage.has("result")) {
+            if (jsonMessage.has("id")) {
                 Response response = mapper.reader(Response.class).readValue(jsonMessage);
                 responseHandlers.remove(response.getId()).received(response.getResult());
             } else {
                 Message message = mapper.reader(Message.class).readValue(messageText);
+                if (message.getMethod() == null) {
+                    return;
+                }
                 switch (message.getMethod()) {
                     case "Debugger.paused":
                         firePaused(parseJson(SuspendedNotification.class, message.getParams()));
@@ -290,6 +293,40 @@ public class ChromeRDPDebugger implements JavaScriptDebugger, ChromeRDPExchangeC
         }
     }
 
+    String getClassName(String objectId) {
+        if (exchange == null) {
+            return null;
+        }
+        Message message = new Message();
+        message.setId(messageIdGenerator.incrementAndGet());
+        message.setMethod("Runtime.callFunctionOn");
+        CallFunctionCommand params = new CallFunctionCommand();
+        CallArgumentDTO arg = new CallArgumentDTO();
+        arg.setObjectId(objectId);
+        params.setObjectId(objectId);
+        params.setArguments(new CallArgumentDTO[] { arg });
+        params.setFunctionDeclaration("$dbg_class");
+        message.setParams(mapper.valueToTree(params));
+        final BlockingQueue<String> sync = new LinkedTransferQueue<>();
+        responseHandlers.put(message.getId(), new ResponseHandler() {
+            @Override public void received(JsonNode node) throws IOException {
+                if (node == null) {
+                    sync.add("");
+                } else {
+                    CallFunctionResponse response = mapper.reader(CallFunctionResponse.class).readValue(node);
+                    sync.add(response.getResult().getValue().getTextValue());
+                }
+            }
+        });
+        sendMessage(message);
+        try {
+            String result = sync.take();
+            return result.isEmpty() ? null : result;
+        } catch (InterruptedException e) {
+            return null;
+        }
+    }
+
     private List<RDPLocalVariable> parseProperties(PropertyDescriptorDTO[] properties) {
         List<RDPLocalVariable> variables = new ArrayList<>();
         if (properties != null) {
@@ -298,14 +335,16 @@ public class ChromeRDPDebugger implements JavaScriptDebugger, ChromeRDPExchangeC
                 RDPValue value;
                 switch (remoteValue.getType()) {
                     case "undefined":
-                        value = new RDPValue("undefined");
+                        value = new RDPValue(this, "undefined", "undefined", null);
                         break;
                     case "object":
                     case "function":
-                        value = new RDPValue(remoteValue.getObjectId());
+                        value = new RDPValue(this, remoteValue.getDescription(), remoteValue.getType(),
+                                remoteValue.getObjectId());
                         break;
                     default:
-                        value = new RDPValue(remoteValue.getValue().asText());
+                        value = new RDPValue(this, remoteValue.getValue().asText(), remoteValue.getType(),
+                                remoteValue.getObjectId());
                         break;
                 }
 

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/RDPScope.java

@@ -4,13 +4,14 @@ import java.util.AbstractMap;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicReference;
 
 /**
  *
  * @author Alexey Andreev <konsoletyper@gmail.com>
  */
 public class RDPScope extends AbstractMap<String, RDPLocalVariable> {
-    private volatile Map<String, RDPLocalVariable> backingMap;
+    private AtomicReference<Map<String, RDPLocalVariable>> backingMap = new AtomicReference<>();
     private ChromeRDPDebugger debugger;
     private String id;
 
@@ -22,32 +23,31 @@ public class RDPScope extends AbstractMap<String, RDPLocalVariable> {
     @Override
     public Set<Entry<String, RDPLocalVariable>> entrySet() {
         initBackingMap();
-        return backingMap.entrySet();
+        return backingMap.get().entrySet();
     }
 
     @Override
     public int size() {
         initBackingMap();
-        return backingMap.size();
+        return backingMap.get().size();
     }
 
     @Override
     public RDPLocalVariable get(Object key) {
         initBackingMap();
-        return backingMap.get(key);
+        return backingMap.get().get(key);
     }
 
     private void initBackingMap() {
-        if (backingMap != null) {
+        if (backingMap.get() != null) {
             return;
         }
-        if (id == null) {
-            backingMap = new HashMap<>();
-        }
         Map<String, RDPLocalVariable> newBackingMap = new HashMap<>();
-        for (RDPLocalVariable variable : debugger.getScope(id)) {
+        if (id != null) {
-            newBackingMap.put(variable.getName(), variable);
+            for (RDPLocalVariable variable : debugger.getScope(id)) {
+                newBackingMap.put(variable.getName(), variable);
+            }
         }
-        backingMap = newBackingMap;
+        backingMap.compareAndSet(null, newBackingMap);
     }
 }

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/RDPValue.java

@@ -11,9 +11,18 @@ import org.teavm.debugging.JavaScriptVariable;
  */
 public class RDPValue implements JavaScriptValue {
     private String representation;
+    private String typeName;
+    private ChromeRDPDebugger debugger;
+    private String objectId;
+    private Map<String, ? extends JavaScriptVariable> properties;
 
-    public RDPValue(String representation) {
+    public RDPValue(ChromeRDPDebugger debugger, String representation, String typeName, String objectId) {
         this.representation = representation;
+        this.typeName = typeName;
+        this.debugger = debugger;
+        this.objectId = objectId;
+        properties = objectId != null ? new RDPScope(debugger, objectId) :
+                Collections.<String, RDPLocalVariable>emptyMap();
     }
 
     @Override
@@ -21,8 +30,19 @@ public class RDPValue implements JavaScriptValue {
         return representation;
     }
 
+    @Override
+    public String getClassName() {
+        if (objectId != null) {
+            String className = debugger.getClassName(objectId);
+            return className != null ? className : "object";
+        } else {
+            return typeName;
+        }
+    }
+
+    @SuppressWarnings("unchecked")
     @Override
     public Map<String, JavaScriptVariable> getProperties() {
-        return Collections.emptyMap();
+        return (Map<String, JavaScriptVariable>)properties;
     }
 }

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/data/CallArgumentDTO.java

@@ -0,0 +1,30 @@
+package org.teavm.chromerdp.data;
+
+import org.codehaus.jackson.JsonNode;
+import org.codehaus.jackson.annotate.JsonIgnoreProperties;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CallArgumentDTO {
+    private String objectId;
+    private JsonNode value;
+
+    public String getObjectId() {
+        return objectId;
+    }
+
+    public void setObjectId(String objectId) {
+        this.objectId = objectId;
+    }
+
+    public JsonNode getValue() {
+        return value;
+    }
+
+    public void setValue(JsonNode value) {
+        this.value = value;
+    }
+}

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/messages/CallFunctionCommand.java

@@ -0,0 +1,48 @@
+package org.teavm.chromerdp.messages;
+
+import org.codehaus.jackson.annotate.JsonIgnoreProperties;
+import org.teavm.chromerdp.data.CallArgumentDTO;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CallFunctionCommand {
+    private String objectId;
+    private String functionDeclaration;
+    private CallArgumentDTO[] arguments;
+    private boolean returnByValue;
+
+    public String getObjectId() {
+        return objectId;
+    }
+
+    public void setObjectId(String objectId) {
+        this.objectId = objectId;
+    }
+
+    public String getFunctionDeclaration() {
+        return functionDeclaration;
+    }
+
+    public void setFunctionDeclaration(String functionDeclaration) {
+        this.functionDeclaration = functionDeclaration;
+    }
+
+    public CallArgumentDTO[] getArguments() {
+        return arguments;
+    }
+
+    public void setArguments(CallArgumentDTO[] arguments) {
+        this.arguments = arguments;
+    }
+
+    public boolean isReturnByValue() {
+        return returnByValue;
+    }
+
+    public void setReturnByValue(boolean returnByValue) {
+        this.returnByValue = returnByValue;
+    }
+}

teavm-chrome-rdp/src/main/java/org/teavm/chromerdp/messages/CallFunctionResponse.java

@@ -0,0 +1,30 @@
+package org.teavm.chromerdp.messages;
+
+import org.codehaus.jackson.annotate.JsonIgnoreProperties;
+import org.teavm.chromerdp.data.RemoteObjectDTO;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CallFunctionResponse {
+    private RemoteObjectDTO result;
+    private boolean wasThrown;
+
+    public RemoteObjectDTO getResult() {
+        return result;
+    }
+
+    public void setResult(RemoteObjectDTO result) {
+        this.result = result;
+    }
+
+    public boolean isWasThrown() {
+        return wasThrown;
+    }
+
+    public void setWasThrown(boolean wasThrown) {
+        this.wasThrown = wasThrown;
+    }
+}

teavm-chrome-rdp/src/main/js/chrome/main.js

@@ -38,7 +38,8 @@ DebuggerAgent.prototype.connectToServer = function() {
 DebuggerAgent.prototype.receiveMessage = function(message) {
     chrome.debugger.sendCommand(this.debuggee, message.method, message.params, function(response) {
         if (message.id) {
-            var responseToServer = { id : message.id, result : response };
+            var responseToServer = { id : message.id, result : response,
+                    error : response ? undefined : chrome.runtime.lastError };
             this.connection.send(JSON.stringify(responseToServer));
         }
     }.bind(this));

teavm-core/src/main/java/org/teavm/debugging/DebugInformation.java

@@ -33,6 +33,8 @@ public class DebugInformation {
     Map<String, Integer> fileNameMap;
     String[] classNames;
     Map<String, Integer> classNameMap;
+    String[] fields;
+    Map<String, Integer> fieldMap;
     String[] methods;
     Map<String, Integer> methodMap;
     String[] variableNames;
@@ -43,6 +45,7 @@ public class DebugInformation {
     Mapping methodMapping;
     Mapping lineMapping;
     Mapping[] variableMappings;
+    List<Map<Integer, Integer>> classesMetadata;
 
     public String[] getCoveredSourceFiles() {
         return fileNames.clone();
@@ -118,6 +121,19 @@ public class DebugInformation {
         return componentByKey(mapping, variableNames, location);
     }
 
+    public String getFieldMeaning(String className, String jsName) {
+        Integer classIndex = classNameMap.get(className);
+        if (classIndex == null) {
+            return null;
+        }
+        Integer jsIndex = fieldMap.get(jsName);
+        if (jsIndex == null) {
+            return null;
+        }
+        Integer fieldIndex = classesMetadata.get(classIndex).get(jsIndex);
+        return fieldIndex != null ? fields[fieldIndex] : null;
+    }
+
     private <T> T componentByKey(Mapping mapping, T[] values, GeneratedLocation location) {
         int keyIndex = indexByKey(mapping, location);
         int valueIndex = keyIndex >= 0 ? mapping.values[keyIndex] : -1;
@@ -142,6 +158,7 @@ public class DebugInformation {
     void rebuildMaps() {
         fileNameMap = mapArray(fileNames);
         classNameMap = mapArray(classNames);
+        fieldMap = mapArray(fields);
         methodMap = mapArray(methods);
         variableNameMap = mapArray(variableNames);
     }

teavm-core/src/main/java/org/teavm/debugging/DebugInformationBuilder.java

@@ -29,6 +29,7 @@ public class DebugInformationBuilder implements DebugInformationEmitter {
     private DebugInformation debugInformation;
     private MappedList files = new MappedList();
     private MappedList classes = new MappedList();
+    private MappedList fields = new MappedList();
     private MappedList methods = new MappedList();
     private MappedList variableNames = new MappedList();
     private Mapping fileMapping = new Mapping();
@@ -39,6 +40,8 @@ public class DebugInformationBuilder implements DebugInformationEmitter {
     private MethodDescriptor currentMethod;
     private String currentClass;
     private String currentFileName;
+    private int currentClassMetadata = -1;
+    private List<ClassMetadata> classesMetadata = new ArrayList<>();
     private int currentLine;
 
     public LocationProvider getLocationProvider() {
@@ -96,18 +99,32 @@ public class DebugInformationBuilder implements DebugInformationEmitter {
         mapping.add(locationProvider, sourceIndex);
     }
 
+    @Override
+    public void addClass(String className) {
+        int classIndex = classes.index(className);
+        while (classIndex >= classesMetadata.size()) {
+            classesMetadata.add(new ClassMetadata());
+        }
+        currentClassMetadata = classIndex;
+    }
+
+    @Override
+    public void addField(String fieldName, String jsName) {
+        ClassMetadata metadata = classesMetadata.get(currentClassMetadata);
+        int fieldIndex = fields.index(fieldName);
+        int jsIndex = fields.index(jsName);
+        metadata.fieldMap.put(jsIndex, fieldIndex);
+    }
+
     public DebugInformation getDebugInformation() {
         if (debugInformation == null) {
             debugInformation = new DebugInformation();
 
-            debugInformation.fileNames = files.getItems();
+            debugInformation.fileNames = files.getItems();;
-            debugInformation.fileNameMap = files.getIndexes();
             debugInformation.classNames = classes.getItems();
-            debugInformation.classNameMap = classes.getIndexes();
+            debugInformation.fields = fields.getItems();
             debugInformation.methods = methods.getItems();
-            debugInformation.methodMap = methods.getIndexes();
             debugInformation.variableNames = variableNames.getItems();
-            debugInformation.variableNameMap = variableNames.getIndexes();
 
             debugInformation.fileMapping = fileMapping.build();
             debugInformation.lineMapping = lineMapping.build();
@@ -119,7 +136,19 @@ public class DebugInformationBuilder implements DebugInformationEmitter {
                 debugInformation.variableMappings[var] = mapping.build();
             }
 
+            List<Map<Integer, Integer>> builtMetadata = new ArrayList<>(classes.list.size());
+            for (int i = 0; i < classes.list.size(); ++i) {
+                if (i >= classesMetadata.size()) {
+                    builtMetadata.add(new HashMap<Integer, Integer>());
+                } else {
+                    Map<Integer, Integer> map = new HashMap<>(classesMetadata.get(i).fieldMap);
+                    builtMetadata.add(map);
+                }
+            }
+            debugInformation.classesMetadata = builtMetadata;
+
             debugInformation.rebuildFileDescriptions();
+            debugInformation.rebuildMaps();
         }
         return debugInformation;
     }
@@ -172,4 +201,8 @@ public class DebugInformationBuilder implements DebugInformationEmitter {
             return new HashMap<>(map);
         }
     }
+
+    static class ClassMetadata {
+        Map<Integer, Integer> fieldMap = new HashMap<>();
+    }
 }

teavm-core/src/main/java/org/teavm/debugging/DebugInformationEmitter.java

@@ -32,4 +32,8 @@ public interface DebugInformationEmitter {
     void emitClass(String className);
 
     void emitVariable(String sourceName, String generatedName);
+
+    void addClass(String className);
+
+    void addField(String fieldName, String jsName);
 }

teavm-core/src/main/java/org/teavm/debugging/DebugInformationReader.java

@@ -18,6 +18,10 @@ package org.teavm.debugging;
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 
 /**
  *
@@ -35,6 +39,7 @@ class DebugInformationReader {
         DebugInformation debugInfo = new DebugInformation();
         debugInfo.fileNames = readStrings();
         debugInfo.classNames = readStrings();
+        debugInfo.fields = readStrings();
         debugInfo.methods = readStrings();
         debugInfo.variableNames = readStrings();
         debugInfo.fileMapping = readMapping();
@@ -42,6 +47,7 @@ class DebugInformationReader {
         debugInfo.classMapping = readMapping();
         debugInfo.methodMapping = readMapping();
         debugInfo.variableMappings = readVariableMappings(debugInfo.variableNames.length);
+        debugInfo.classesMetadata = readClassesMetadata(debugInfo.classNames.length);
         debugInfo.rebuildFileDescriptions();
         debugInfo.rebuildMaps();
         return debugInfo;
@@ -58,6 +64,22 @@ class DebugInformationReader {
         return mappings;
     }
 
+    private List<Map<Integer, Integer>> readClassesMetadata(int count) throws IOException {
+        List<Map<Integer, Integer>> classes = new ArrayList<>(count);
+        for (int i = 0; i < count; ++i) {
+            Map<Integer, Integer> cls = new HashMap<>();
+            classes.add(cls);
+            int entryCount = readUnsignedNumber();
+            resetRelativeNumber();
+            for (int j = 0; j < entryCount; ++j) {
+                int key = readRelativeNumber();
+                int value = readUnsignedNumber();
+                cls.put(key, value);
+            }
+        }
+        return classes;
+    }
+
     private int processSign(int number) {
         boolean negative = (number & 1) != 0;
         number >>>= 1;

teavm-core/src/main/java/org/teavm/debugging/DebugInformationWriter.java

@@ -17,6 +17,10 @@ package org.teavm.debugging;
 
 import java.io.DataOutput;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
 
 /**
  *
@@ -33,6 +37,7 @@ class DebugInformationWriter {
     public void write(DebugInformation debugInfo) throws IOException {
         writeStringArray(debugInfo.fileNames);
         writeStringArray(debugInfo.classNames);
+        writeStringArray(debugInfo.fields);
         writeStringArray(debugInfo.methods);
         writeStringArray(debugInfo.variableNames);
 
@@ -41,6 +46,7 @@ class DebugInformationWriter {
         writeMapping(debugInfo.classMapping);
         writeMapping(debugInfo.methodMapping);
         writeVariableMappings(debugInfo);
+        writeClassMetadata(debugInfo.classesMetadata);
     }
 
     private void writeVariableMappings(DebugInformation debugInfo) throws IOException {
@@ -57,6 +63,20 @@ class DebugInformationWriter {
         }
     }
 
+    private void writeClassMetadata(List<Map<Integer, Integer>> classes) throws IOException {
+        for (int i = 0; i < classes.size(); ++i) {
+            Map<Integer, Integer> cls = classes.get(i);
+            writeUnsignedNumber(cls.size());
+            List<Integer> keys = new ArrayList<>(cls.keySet());
+            Collections.sort(keys);
+            resetRelativeNumber();
+            for (int key : keys) {
+                writeRelativeNumber(key);
+                writeUnsignedNumber(cls.get(key));
+            }
+        }
+    }
+
     private int nonNullVariableMappings(DebugInformation debugInfo) {
         int count = 0;
         for (int i = 0; i < debugInfo.variableMappings.length; ++i) {

teavm-core/src/main/java/org/teavm/debugging/Debugger.java

@@ -288,6 +288,16 @@ public class Debugger {
         return debugInfo.getVariableMeaningAt(location.getLine(), location.getColumn(), variable);
     }
 
+    public String mapField(String className, String jsField) {
+        for (DebugInformation debugInfo : debugInformationMap.values()) {
+            String meaning = debugInfo.getFieldMeaning(className, jsField);
+            if (meaning != null) {
+                return meaning;
+            }
+        }
+        return null;
+    }
+
     private JavaScriptDebuggerListener javaScriptListener = new JavaScriptDebuggerListener() {
         @Override
         public void resumed() {

teavm-core/src/main/java/org/teavm/debugging/DummyDebugInformationEmitter.java

@@ -43,4 +43,12 @@ public class DummyDebugInformationEmitter implements DebugInformationEmitter {
     @Override
     public void setLocationProvider(LocationProvider locationProvider) {
     }
+
+    @Override
+    public void addClass(String className) {
+    }
+
+    @Override
+    public void addField(String fieldName, String jsName) {
+    }
 }

teavm-core/src/main/java/org/teavm/debugging/JavaScriptValue.java

@@ -24,5 +24,7 @@ import java.util.Map;
 public interface JavaScriptValue {
     String getRepresentation();
 
+    String getClassName();
+
     Map<String, JavaScriptVariable> getProperties();
 }

teavm-core/src/main/java/org/teavm/debugging/PropertyMap.java

@@ -0,0 +1,59 @@
+package org.teavm.debugging;
+
+import java.util.AbstractMap;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+class PropertyMap extends AbstractMap<String, Variable>{
+    private String className;
+    private AtomicReference<Map<String, Variable>> backingMap = new AtomicReference<>();
+    private Map<String, JavaScriptVariable> jsVariables;
+    private Debugger debugger;
+
+    public PropertyMap(String className, Map<String, JavaScriptVariable> jsVariables, Debugger debugger) {
+        this.className = className;
+        this.jsVariables = jsVariables;
+        this.debugger = debugger;
+    }
+
+    @Override
+    public int size() {
+        updateBackingMap();
+        return backingMap.get().size();
+    }
+
+    @Override
+    public Variable get(Object key) {
+        updateBackingMap();
+        return backingMap.get().get(key);
+    }
+
+    @Override
+    public Set<Entry<String, Variable>> entrySet() {
+        updateBackingMap();
+        return backingMap.get().entrySet();
+    }
+
+    private void updateBackingMap() {
+        if (backingMap.get() != null) {
+            return;
+        }
+        Map<String, Variable> vars = new HashMap<>();
+        for (Map.Entry<String, JavaScriptVariable> entry : jsVariables.entrySet()) {
+            JavaScriptVariable jsVar = entry.getValue();
+            String name = debugger.mapField(className, entry.getKey());
+            if (name == null) {
+                continue;
+            }
+            Value value = new Value(debugger, jsVar.getValue());
+            vars.put(entry.getKey(), new Variable(name, value));
+        }
+        backingMap.compareAndSet(null, vars);
+    }
+}

teavm-core/src/main/java/org/teavm/debugging/SimpleValue.java

@@ -1,41 +0,0 @@
-/*
- *  Copyright 2014 Alexey Andreev.
- *
- *  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 org.teavm.debugging;
-
-import java.util.Collections;
-import java.util.Map;
-
-/**
- *
- * @author Alexey Andreev
- */
-class SimpleValue extends Value {
-    private String representation;
-
-    public SimpleValue(String representation) {
-        this.representation = representation;
-    }
-
-    @Override
-    public String getRepresentation() {
-        return representation;
-    }
-
-    @Override
-    public Map<String, Variable> getProperties() {
-        return Collections.emptyMap();
-    }
-}

teavm-core/src/main/java/org/teavm/debugging/Value.java

@@ -16,13 +16,34 @@
 package org.teavm.debugging;
 
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
 
 /**
  *
  * @author Alexey Andreev <konsoletyper@gmail.com>
  */
-public abstract class Value {
+public class Value {
-    public abstract String getRepresentation();
+    private Debugger debugger;
+    private JavaScriptValue jsValue;
+    private AtomicReference<PropertyMap> properties = new AtomicReference<>();
 
-    public abstract Map<String, Variable> getProperties();
+    Value(Debugger debugger, JavaScriptValue jsValue) {
+        this.debugger = debugger;
+        this.jsValue = jsValue;
+    }
+
+    public String getRepresentation() {
+        return jsValue.getRepresentation();
+    }
+
+    public String getType() {
+        return jsValue.getClassName();
+    }
+
+    public Map<String, Variable> getProperties() {
+        if (properties.get() == null) {
+            properties.compareAndSet(null, new PropertyMap(jsValue.getClassName(), jsValue.getProperties(), debugger));
+        }
+        return properties.get();
+    }
 }

teavm-core/src/main/java/org/teavm/debugging/VariableMap.java

@@ -66,7 +66,7 @@ class VariableMap extends AbstractMap<String, Variable> {
             if (name == null) {
                 continue;
             }
-            SimpleValue value = new SimpleValue(jsVar.getValue().getRepresentation());
+            Value value = new Value(debugger, jsVar.getValue());
             vars.put(entry.getKey(), new Variable(name, value));
         }
         backingMap.compareAndSet(null, vars);

teavm-core/src/main/java/org/teavm/javascript/Renderer.java

@@ -243,6 +243,7 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
 
     public void render(ClassNode cls) throws RenderingException {
         debugEmitter.emitClass(cls.getName());
+        debugEmitter.addClass(cls.getName());
         try {
             writer.append("function ").appendClass(cls.getName()).append("()").ws().append("{")
                     .indent().softNewLine();
@@ -254,8 +255,10 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
                 if (value == null) {
                     value = getDefaultValue(field.getType());
                 }
-                writer.append("this.").appendField(new FieldReference(cls.getName(), field.getName())).ws()
+                FieldReference fieldRef = new FieldReference(cls.getName(), field.getName());
-                        .append("=").ws().append(constantToString(value)).append(";").softNewLine();
+                writer.append("this.").appendField(fieldRef).ws().append("=").ws().append(constantToString(value))
+                        .append(";").softNewLine();
+                debugEmitter.addField(field.getName(), naming.getNameFor(fieldRef));
             }
             writer.outdent().append("}").newLine();
 
@@ -267,8 +270,8 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
                 if (value == null) {
                     value = getDefaultValue(field.getType());
                 }
-                writer.appendClass(cls.getName()).append('.')
+                FieldReference fieldRef = new FieldReference(cls.getName(), field.getName());
-                        .appendField(new FieldReference(cls.getName(), field.getName())).ws().append("=").ws()
+                writer.appendClass(cls.getName()).append('.').appendField(fieldRef).ws().append("=").ws()
                         .append(constantToString(value)).append(";").softNewLine();
             }
 

teavm-core/src/main/resources/org/teavm/javascript/runtime.js

@@ -398,7 +398,8 @@ function $dbg_class(obj) {
     if (obj instanceof Long) {
         return "long";
     }
-    return obj.constructor.$meta.name;
+    var meta = obj.constructor.$meta;
+    return meta ? meta.name : "";
 }
 
 Long = function(lo, hi) {