From 78c55437e326cad8d8cbbe29f167be2a1afee970 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <konsoletyper@gmail.com>
Date: Thu, 24 Jan 2019 16:28:30 +0300
Subject: [PATCH] Add stack deobfuscation to dev server

---
 .idea/runConfigurations/build_teavm_fast.xml  |   1 +
 .../javascript/rendering/Renderer.java        |   2 +
 .../org/teavm/cli/TeaVMDevServerRunner.java   |   5 +
 .../main/java/org/teavm/cli/TeaVMRunner.java  |  10 ++
 .../java/org/teavm/tooling/TeaVMTool.java     |   7 +-
 .../teavm/tooling/builder/BuildStrategy.java  |   2 +
 .../builder/InProcessBuildStrategy.java       |   7 +
 .../tooling/builder/RemoteBuildStrategy.java  |   7 +-
 .../org/teavm/tooling/daemon/BuildDaemon.java |   1 +
 .../tooling/daemon/RemoteBuildRequest.java    |   1 +
 tools/devserver/pom.xml                       |  41 +++++
 .../java/org/teavm/devserver/CodeServlet.java |  25 ++-
 .../java/org/teavm/devserver/DevServer.java   |   6 +
 .../deobfuscate/DeobfuscateFunction.java      |  24 +++
 .../devserver/deobfuscate/Deobfuscator.java   | 148 ++++++++++++++++++
 .../deobfuscate/DeobfuscatorCallback.java     |  24 +++
 .../teavm/devserver/deobfuscate/Frame.java    |  33 ++++
 .../deobfuscate/Int8ArrayInputStream.java     |  48 ++++++
 .../org/teavm/devserver/indicator.js          |  36 ++++-
 .../devserver/DevServerConfiguration.java     |   1 +
 .../teavm/idea/devserver/DevServerRunner.java |   6 +
 .../TeaVMDevServerConfiguration.java          |  11 ++
 .../devserver/TeaVMDevServerRunState.java     |   1 +
 .../ui/TeaVMDevServerSettingsPanel.java       |   5 +
 .../org/teavm/maven/TeaVMCompileMojo.java     |   4 +
 25 files changed, 450 insertions(+), 6 deletions(-)
 create mode 100644 tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscateFunction.java
 create mode 100644 tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Deobfuscator.java
 create mode 100644 tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscatorCallback.java
 create mode 100644 tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Frame.java
 create mode 100644 tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Int8ArrayInputStream.java

diff --git a/.idea/runConfigurations/build_teavm_fast.xml b/.idea/runConfigurations/build_teavm_fast.xml
index f18528139..bae310f9b 100644
--- a/.idea/runConfigurations/build_teavm_fast.xml
+++ b/.idea/runConfigurations/build_teavm_fast.xml
@@ -10,6 +10,7 @@
           </option>
           <option name="goals">
             <list>
+              <option value="-e" />
               <option value="install" />
               <option value="-DskipTests" />
               <option value="-Dteavm.build.all=false" />
diff --git a/core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java b/core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java
index 69c19719d..a2172bf6a 100644
--- a/core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java
+++ b/core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java
@@ -490,6 +490,7 @@ public class Renderer implements RenderingManager {
                 writer.append(',').softNewLine();
             }
             first = false;
+            debugEmitter.emitClass(cls.getName());
             writer.appendClass(cls.getName()).append(",").ws();
 
             if (classesRequiringName.contains(cls.getName())) {
@@ -541,6 +542,7 @@ public class Renderer implements RenderingManager {
             collectMethodsToCopyFromInterfaces(classSource.get(cls.getName()), virtualMethods);
 
             renderVirtualDeclarations(virtualMethods);
+            debugEmitter.emitClass(null);
         }
         writer.append("]);").newLine();
     }
diff --git a/tools/cli/src/main/java/org/teavm/cli/TeaVMDevServerRunner.java b/tools/cli/src/main/java/org/teavm/cli/TeaVMDevServerRunner.java
index e3ba94731..5f89b524f 100644
--- a/tools/cli/src/main/java/org/teavm/cli/TeaVMDevServerRunner.java
+++ b/tools/cli/src/main/java/org/teavm/cli/TeaVMDevServerRunner.java
@@ -71,6 +71,10 @@ public final class TeaVMDevServerRunner {
                 .withDescription("display indicator on web page")
                 .withLongOpt("indicator")
                 .create('i'));
+        options.addOption(OptionBuilder
+                .withDescription("deobfuscate stack traces")
+                .withLongOpt("deobfuscate-stack")
+                .create());
         options.addOption(OptionBuilder
                 .withDescription("automatically reload page when compilation completes")
                 .withLongOpt("auto-reload")
@@ -123,6 +127,7 @@ public final class TeaVMDevServerRunner {
         parseOutputOptions();
 
         devServer.setIndicator(commandLine.hasOption("indicator"));
+        devServer.setDeobfuscateStack(commandLine.hasOption("deobfuscate-stack"));
         devServer.setReloadedAutomatically(commandLine.hasOption("auto-reload"));
         devServer.setLog(new ConsoleTeaVMToolLog(commandLine.hasOption('v')));
         if (commandLine.hasOption("port")) {
diff --git a/tools/cli/src/main/java/org/teavm/cli/TeaVMRunner.java b/tools/cli/src/main/java/org/teavm/cli/TeaVMRunner.java
index 1020c81da..06ef798d8 100644
--- a/tools/cli/src/main/java/org/teavm/cli/TeaVMRunner.java
+++ b/tools/cli/src/main/java/org/teavm/cli/TeaVMRunner.java
@@ -122,6 +122,12 @@ public final class TeaVMRunner {
                 .hasArg()
                 .withDescription("WebAssembly binary version (currently, only 1 is supported)")
                 .create());
+        options.addOption(OptionBuilder
+                .withLongOpt("entry-point")
+                .withArgName("name")
+                .hasArg()
+                .withDescription("Entry point name in target language (main by default)")
+                .create("e"));
         options.addOption(OptionBuilder
                 .withLongOpt("min-heap")
                 .withArgName("size")
@@ -166,6 +172,10 @@ public final class TeaVMRunner {
         parseWasmOptions();
         parseHeap();
 
+        if (commandLine.hasOption("e")) {
+            tool.setEntryPointName(commandLine.getOptionValue("e"));
+        }
+
         interactive = commandLine.hasOption('w');
 
         String[] args = commandLine.getArgs();
diff --git a/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java b/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
index c7f683c14..b43b9ae77 100644
--- a/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
+++ b/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
@@ -70,6 +70,7 @@ public class TeaVMTool {
     private String targetFileName = "";
     private boolean minifying = true;
     private String mainClass;
+    private String entryPointName = "main";
     private Properties properties = new Properties();
     private boolean debugInformationGenerated;
     private boolean sourceMapsFileGenerated;
@@ -139,6 +140,10 @@ public class TeaVMTool {
         this.mainClass = mainClass;
     }
 
+    public void setEntryPointName(String entryPointName) {
+        this.entryPointName = entryPointName;
+    }
+
     public boolean isDebugInformationGenerated() {
         return debugInformationGenerated;
     }
@@ -367,7 +372,7 @@ public class TeaVMTool {
                 vm.add(transformer);
             }
             if (mainClass != null) {
-                vm.entryPoint(mainClass);
+                vm.entryPoint(mainClass, entryPointName);
             }
             for (String className : classesToPreserve) {
                 vm.preserveType(className);
diff --git a/tools/core/src/main/java/org/teavm/tooling/builder/BuildStrategy.java b/tools/core/src/main/java/org/teavm/tooling/builder/BuildStrategy.java
index d46b7bc9f..a8e890baa 100644
--- a/tools/core/src/main/java/org/teavm/tooling/builder/BuildStrategy.java
+++ b/tools/core/src/main/java/org/teavm/tooling/builder/BuildStrategy.java
@@ -38,6 +38,8 @@ public interface BuildStrategy {
 
     void setMainClass(String mainClass);
 
+    void setEntryPointName(String entryPointName);
+
     void setTargetDirectory(String targetDirectory);
 
     void setSourceMapsFileGenerated(boolean sourceMapsFileGenerated);
diff --git a/tools/core/src/main/java/org/teavm/tooling/builder/InProcessBuildStrategy.java b/tools/core/src/main/java/org/teavm/tooling/builder/InProcessBuildStrategy.java
index 3a136c304..a05b6fa98 100644
--- a/tools/core/src/main/java/org/teavm/tooling/builder/InProcessBuildStrategy.java
+++ b/tools/core/src/main/java/org/teavm/tooling/builder/InProcessBuildStrategy.java
@@ -44,6 +44,7 @@ public class InProcessBuildStrategy implements BuildStrategy {
     private List<String> classPathEntries = new ArrayList<>();
     private TeaVMTargetType targetType;
     private String mainClass;
+    private String entryPointName;
     private String targetDirectory;
     private String targetFileName = "";
     private boolean incremental;
@@ -98,6 +99,11 @@ public class InProcessBuildStrategy implements BuildStrategy {
         this.mainClass = mainClass;
     }
 
+    @Override
+    public void setEntryPointName(String entryPointName) {
+        this.entryPointName = entryPointName;
+    }
+
     @Override
     public void setTargetDirectory(String targetDirectory) {
         this.targetDirectory = targetDirectory;
@@ -191,6 +197,7 @@ public class InProcessBuildStrategy implements BuildStrategy {
         tool.setLog(log);
         tool.setTargetType(targetType);
         tool.setMainClass(mainClass);
+        tool.setEntryPointName(entryPointName);
         tool.setTargetDirectory(new File(targetDirectory));
         tool.setTargetFileName(targetFileName);
         tool.setClassLoader(buildClassLoader());
diff --git a/tools/core/src/main/java/org/teavm/tooling/builder/RemoteBuildStrategy.java b/tools/core/src/main/java/org/teavm/tooling/builder/RemoteBuildStrategy.java
index efc1ff6a2..3da229aba 100644
--- a/tools/core/src/main/java/org/teavm/tooling/builder/RemoteBuildStrategy.java
+++ b/tools/core/src/main/java/org/teavm/tooling/builder/RemoteBuildStrategy.java
@@ -78,6 +78,11 @@ public class RemoteBuildStrategy implements BuildStrategy {
         request.mainClass = mainClass;
     }
 
+    @Override
+    public void setEntryPointName(String entryPointName) {
+        request.entryPointName = entryPointName;
+    }
+
     @Override
     public void setTargetDirectory(String targetDirectory) {
         request.targetDirectory = targetDirectory;
@@ -219,7 +224,7 @@ public class RemoteBuildStrategy implements BuildStrategy {
         private TeaVMProgressListener listener;
         private TeaVMToolLog log;
 
-        public CallbackImpl(TeaVMProgressListener listener, TeaVMToolLog log) throws RemoteException {
+        CallbackImpl(TeaVMProgressListener listener, TeaVMToolLog log) throws RemoteException {
             super();
             this.listener = listener;
             this.log = log;
diff --git a/tools/core/src/main/java/org/teavm/tooling/daemon/BuildDaemon.java b/tools/core/src/main/java/org/teavm/tooling/daemon/BuildDaemon.java
index 9a4ee8058..a12a529da 100644
--- a/tools/core/src/main/java/org/teavm/tooling/daemon/BuildDaemon.java
+++ b/tools/core/src/main/java/org/teavm/tooling/daemon/BuildDaemon.java
@@ -141,6 +141,7 @@ public class BuildDaemon extends UnicastRemoteObject implements RemoteBuildServi
         }
         tool.setTargetType(request.targetType);
         tool.setMainClass(request.mainClass);
+        tool.setEntryPointName(request.entryPointName);
         tool.setTargetDirectory(new File(request.targetDirectory));
         tool.setTargetFileName(request.tagetFileName);
         tool.setClassLoader(buildClassLoader(request.classPath, incremental && request.incremental));
diff --git a/tools/core/src/main/java/org/teavm/tooling/daemon/RemoteBuildRequest.java b/tools/core/src/main/java/org/teavm/tooling/daemon/RemoteBuildRequest.java
index 3c50ac850..e5dcf1f69 100644
--- a/tools/core/src/main/java/org/teavm/tooling/daemon/RemoteBuildRequest.java
+++ b/tools/core/src/main/java/org/teavm/tooling/daemon/RemoteBuildRequest.java
@@ -31,6 +31,7 @@ public class RemoteBuildRequest implements Serializable {
     public String[] classesToPreserve;
     public TeaVMTargetType targetType;
     public String mainClass;
+    public String entryPointName;
     public String targetDirectory;
     public String tagetFileName = "";
     public boolean sourceMapsFileGenerated;
diff --git a/tools/devserver/pom.xml b/tools/devserver/pom.xml
index e76166256..8e0f7ee48 100644
--- a/tools/devserver/pom.xml
+++ b/tools/devserver/pom.xml
@@ -61,6 +61,12 @@
       <artifactId>teavm-core</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.teavm</groupId>
+      <artifactId>teavm-jso-apis</artifactId>
+      <version>${project.version}</version>
+      <scope>provided</scope>
+    </dependency>
     <dependency>
       <groupId>org.teavm</groupId>
       <artifactId>teavm-tooling</artifactId>
@@ -100,6 +106,41 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.teavm</groupId>
+        <artifactId>teavm-maven-plugin</artifactId>
+        <version>${project.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>org.teavm</groupId>
+            <artifactId>teavm-jso-impl</artifactId>
+            <version>${project.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>org.teavm</groupId>
+            <artifactId>teavm-classlib</artifactId>
+            <version>${project.version}</version>
+          </dependency>
+        </dependencies>
+        <executions>
+          <execution>
+            <id>compile-deobfuscator</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <phase>process-classes</phase>
+            <configuration>
+              <targetDirectory>${build.directory}/classes/teavm/devserver</targetDirectory>
+              <targetFileName>deobfuscator.js</targetFileName>
+              <minifying>true</minifying>
+              <optimizationLevel>ADVANCED</optimizationLevel>
+              <mainClass>org.teavm.devserver.deobfuscate.Deobfuscator</mainClass>
+              <entryPointName>$teavm_deobfuscator</entryPointName>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java b/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
index be59e91d2..eb5827d52 100644
--- a/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
+++ b/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
@@ -97,9 +97,11 @@ public class CodeServlet extends HttpServlet {
     private String fileName = "classes.js";
     private String pathToFile = "/";
     private String indicatorWsPath;
+    private String deobfuscatorPath;
     private List<String> sourcePath = new ArrayList<>();
     private TeaVMToolLog log = new EmptyTeaVMToolLog();
     private boolean indicator;
+    private boolean deobfuscateStack;
     private boolean automaticallyReloaded;
     private int port;
     private int debugPort;
@@ -163,6 +165,10 @@ public class CodeServlet extends HttpServlet {
         this.indicator = indicator;
     }
 
+    public void setDeobfuscateStack(boolean deobfuscateStack) {
+        this.deobfuscateStack = deobfuscateStack;
+    }
+
     public void setPort(int port) {
         this.port = port;
     }
@@ -263,6 +269,7 @@ public class CodeServlet extends HttpServlet {
         }
 
         indicatorWsPath = pathToFile + fileName + ".ws";
+        deobfuscatorPath = pathToFile + fileName + ".deobfuscator.js";
         WebSocketPolicy wsPolicy = new WebSocketPolicy(WebSocketBehavior.SERVER);
         wsFactory = WebSocketServletFactory.Loader.load(config.getServletContext(), wsPolicy);
         wsFactory.setCreator((req, resp) -> {
@@ -304,6 +311,9 @@ public class CodeServlet extends HttpServlet {
                             return;
                         }
                     }
+                } else if (path.equals(deobfuscatorPath)) {
+                    serveDeobfuscator(resp);
+                    return;
                 } else {
                     byte[] fileContent;
                     boolean firstTime;
@@ -340,6 +350,17 @@ public class CodeServlet extends HttpServlet {
         resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
     }
 
+    private void serveDeobfuscator(HttpServletResponse resp) throws IOException {
+        ClassLoader loader = CodeServlet.class.getClassLoader();
+        resp.setStatus(HttpServletResponse.SC_OK);
+        resp.setCharacterEncoding("UTF-8");
+        resp.setContentType("text/plain");
+        try (InputStream input = loader.getResourceAsStream("teavm/devserver/deobfuscator.js")) {
+            IOUtils.copy(input, resp.getOutputStream());
+        }
+        resp.getOutputStream().flush();
+    }
+
     private void proxy(HttpServletRequest req, HttpServletResponse resp, String path) throws IOException {
         AsyncContext async = req.startAsync();
 
@@ -763,9 +784,11 @@ public class CodeServlet extends HttpServlet {
             script = script.replace("WS_PATH", "localhost:" + port + pathToFile + fileName + ".ws");
             script = script.replace("BOOT_FLAG", Boolean.toString(boot));
             script = script.replace("RELOAD_FLAG", Boolean.toString(automaticallyReloaded));
-            script = script.replace("FILE_NAME", "http://localhost:" + port + pathToFile + fileName);
             script = script.replace("INDICATOR_FLAG", Boolean.toString(indicator));
             script = script.replace("DEBUG_PORT", Integer.toString(debugPort));
+            script = script.replace("FILE_NAME", "\"" + fileName + "\"");
+            script = script.replace("PATH_TO_FILE", "\"http://localhost:" + port + pathToFile + "\"");
+            script = script.replace("DEOBFUSCATE_FLAG", String.valueOf(deobfuscateStack));
             return script;
         } catch (IOException e) {
             throw new RuntimeException("IO error occurred writing debug information", e);
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/DevServer.java b/tools/devserver/src/main/java/org/teavm/devserver/DevServer.java
index 1588d1cf0..1992ed424 100644
--- a/tools/devserver/src/main/java/org/teavm/devserver/DevServer.java
+++ b/tools/devserver/src/main/java/org/teavm/devserver/DevServer.java
@@ -30,6 +30,7 @@ public class DevServer {
     private String fileName = "classes.js";
     private List<String> sourcePath = new ArrayList<>();
     private boolean indicator;
+    private boolean deobfuscateStack;
     private boolean reloadedAutomatically;
     private TeaVMToolLog log;
     private CodeServlet servlet;
@@ -79,6 +80,10 @@ public class DevServer {
         this.indicator = indicator;
     }
 
+    public void setDeobfuscateStack(boolean deobfuscateStack) {
+        this.deobfuscateStack = deobfuscateStack;
+    }
+
     public void setReloadedAutomatically(boolean reloadedAutomatically) {
         this.reloadedAutomatically = reloadedAutomatically;
     }
@@ -126,6 +131,7 @@ public class DevServer {
         servlet.setLog(log);
         servlet.getSourcePath().addAll(sourcePath);
         servlet.setIndicator(indicator);
+        servlet.setDeobfuscateStack(deobfuscateStack);
         servlet.setAutomaticallyReloaded(reloadedAutomatically);
         servlet.setPort(port);
         servlet.setDebugPort(debugPort);
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscateFunction.java b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscateFunction.java
new file mode 100644
index 000000000..9bf83db4f
--- /dev/null
+++ b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscateFunction.java
@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2019 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.devserver.deobfuscate;
+
+import org.teavm.jso.JSFunctor;
+import org.teavm.jso.JSObject;
+
+@JSFunctor
+public interface DeobfuscateFunction extends JSObject {
+    Frame[] apply(String stack);
+}
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Deobfuscator.java b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Deobfuscator.java
new file mode 100644
index 000000000..e8c1be687
--- /dev/null
+++ b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Deobfuscator.java
@@ -0,0 +1,148 @@
+/*
+ *  Copyright 2019 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.devserver.deobfuscate;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import org.teavm.debugging.information.DebugInformation;
+import org.teavm.debugging.information.SourceLocation;
+import org.teavm.jso.JSBody;
+import org.teavm.jso.ajax.XMLHttpRequest;
+import org.teavm.jso.core.JSArray;
+import org.teavm.jso.core.JSRegExp;
+import org.teavm.jso.core.JSString;
+import org.teavm.jso.typedarrays.ArrayBuffer;
+import org.teavm.jso.typedarrays.Int8Array;
+import org.teavm.model.MethodReference;
+
+public final class Deobfuscator {
+    private static final JSRegExp FRAME_PATTERN = JSRegExp.create("^ +at ([^(]+) *\\((.+):([0-9]+):([0-9]+)\\) *$");
+
+    private Deobfuscator() {
+    }
+
+    public static void main(String[] args) {
+        loadDeobfuscator(args[0], args[1]);
+    }
+
+    private static void loadDeobfuscator(String fileName, String classesFileName) {
+        XMLHttpRequest xhr = XMLHttpRequest.create();
+        xhr.setResponseType("arraybuffer");
+        xhr.onComplete(() -> {
+            installDeobfuscator(xhr.getResponse().cast(), classesFileName);
+        });
+        xhr.open("GET", fileName);
+        xhr.send();
+    }
+
+    private static void installDeobfuscator(ArrayBuffer buffer, String classesFileName) {
+        Int8Array array = Int8Array.create(buffer);
+        DebugInformation debugInformation;
+        try {
+            debugInformation = DebugInformation.read(new Int8ArrayInputStream(array));
+        } catch (IOException e) {
+            e.printStackTrace();
+            return;
+        }
+
+        setDeobfuscateFunction(stack -> {
+            List<Frame> frames = new ArrayList<>();
+            for (String line : splitLines(stack)) {
+                JSArray<JSString> groups = FRAME_PATTERN.exec(JSString.valueOf(line));
+                if (groups == null) {
+                    continue;
+                }
+
+                String functionName = groups.get(1).stringValue();
+                String fileName = groups.get(2).stringValue();
+                int lineNumber = Integer.parseInt(groups.get(3).stringValue());
+                int columnNumber = Integer.parseInt(groups.get(4).stringValue());
+                Frame frame = deobfuscateFrame(debugInformation, classesFileName, fileName, lineNumber, columnNumber);
+                if (frame == null) {
+                    frame = createDefaultFrame(fileName, functionName, lineNumber);
+                }
+                frames.add(frame);
+            }
+            return frames.toArray(new Frame[0]);
+        });
+        DeobfuscatorCallback callback = getCallback();
+        if (callback != null) {
+            callback.run();
+        }
+    }
+
+    private static Frame deobfuscateFrame(DebugInformation debugInformation, String classesFileName,
+            String fileName, int lineNumber, int columnNumber) {
+        if (!fileName.equals(classesFileName)) {
+            return null;
+        }
+
+        MethodReference method = debugInformation.getMethodAt(lineNumber - 1, columnNumber - 1);
+        if (method == null) {
+            return null;
+        }
+
+        SourceLocation location = debugInformation.getSourceLocation(lineNumber - 1, columnNumber - 1);
+
+        String decodedFileName = location != null ? location.getFileName() : null;
+        if (decodedFileName != null) {
+            decodedFileName = decodedFileName.substring(decodedFileName.lastIndexOf('/') + 1);
+        }
+
+        Frame frame = createEmptyFrame();
+        frame.setClassName(method.getClassName());
+        frame.setMethodName(method.getName());
+        frame.setFileName(decodedFileName);
+        if (location != null) {
+            frame.setLineNumber(location.getLine());
+        }
+        return frame;
+    }
+
+    private static Frame createDefaultFrame(String fileName, String functionName, int lineNumber) {
+        Frame frame = createEmptyFrame();
+        frame.setFileName(fileName);
+        frame.setMethodName(functionName != null ? functionName : "<unknown function>");
+        frame.setClassName("<JS>");
+        frame.setLineNumber(lineNumber);
+        return frame;
+    }
+
+    private static String[] splitLines(String text) {
+        List<String> result = new ArrayList<>();
+        int index = 0;
+        while (index < text.length()) {
+            int next = text.indexOf('\n', index);
+            if (next < 0) {
+                next = text.length();
+            }
+            result.add(text.substring(index, next));
+            index = next + 1;
+        }
+        return result.toArray(new String[0]);
+    }
+
+    @JSBody(script = "return {};")
+    private static native Frame createEmptyFrame();
+
+    @JSBody(params = "f", script = "window.$rt_decodeStack = f;")
+    private static native void setDeobfuscateFunction(DeobfuscateFunction f);
+
+    @JSBody(script = "return typeof $teavm_deobfuscator_callback === 'function'"
+            + "? $teavm_deobfuscator_callback : null;")
+    private static native DeobfuscatorCallback getCallback();
+}
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscatorCallback.java b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscatorCallback.java
new file mode 100644
index 000000000..d79fc049b
--- /dev/null
+++ b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/DeobfuscatorCallback.java
@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2019 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.devserver.deobfuscate;
+
+import org.teavm.jso.JSFunctor;
+import org.teavm.jso.JSObject;
+
+@JSFunctor
+public interface DeobfuscatorCallback extends JSObject {
+    void run();
+}
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Frame.java b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Frame.java
new file mode 100644
index 000000000..742e54041
--- /dev/null
+++ b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Frame.java
@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2019 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.devserver.deobfuscate;
+
+import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
+
+public interface Frame extends JSObject {
+    @JSProperty
+    void setClassName(String className);
+
+    @JSProperty
+    void setFileName(String fileName);
+
+    @JSProperty
+    void setMethodName(String methodName);
+
+    @JSProperty
+    void setLineNumber(int lineNumber);
+}
diff --git a/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Int8ArrayInputStream.java b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Int8ArrayInputStream.java
new file mode 100644
index 000000000..95481c457
--- /dev/null
+++ b/tools/devserver/src/main/java/org/teavm/devserver/deobfuscate/Int8ArrayInputStream.java
@@ -0,0 +1,48 @@
+/*
+ *  Copyright 2019 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.devserver.deobfuscate;
+
+import java.io.InputStream;
+import org.teavm.jso.typedarrays.Int8Array;
+
+public class Int8ArrayInputStream extends InputStream {
+    private Int8Array array;
+    private int pos;
+
+    public Int8ArrayInputStream(Int8Array array) {
+        this.array = array;
+    }
+
+    @Override
+    public int read() {
+        if (pos >= array.getLength()) {
+            return -1;
+        }
+        return array.get(pos++) & 0xFF;
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) {
+        if (pos >= array.getLength()) {
+            return -1;
+        }
+        int count = Math.min(len, array.getLength() - pos);
+        for (int i = 0; i < count; ++i) {
+            b[off++] = array.get(pos++);
+        }
+        return count;
+    }
+}
diff --git a/tools/devserver/src/main/resources/org/teavm/devserver/indicator.js b/tools/devserver/src/main/resources/org/teavm/devserver/indicator.js
index 2bcc9a04b..9e21dcce0 100644
--- a/tools/devserver/src/main/resources/org/teavm/devserver/indicator.js
+++ b/tools/devserver/src/main/resources/org/teavm/devserver/indicator.js
@@ -13,11 +13,14 @@
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
-(function () {
+(function (window) {
     var boot = BOOT_FLAG;
     var reload = RELOAD_FLAG;
     var indicatorVisible = INDICATOR_FLAG;
     var debugPort = DEBUG_PORT;
+    var deobfuscate = DEOBFUSCATE_FLAG;
+    var fileName = FILE_NAME;
+    var pathToFile = PATH_TO_FILE;
 
     function createWebSocket() {
         return new WebSocket("ws://WS_PATH");
@@ -128,10 +131,37 @@
         }
     }
 
+    function installDeobfuscator() {
+        if (!deobfuscate) {
+            return;
+        }
+
+        if (typeof main === 'function') {
+            var oldMain = main;
+            main = function() {
+                var args = arguments;
+                window.$teavm_deobfuscator_callback = function() {
+                    oldMain.apply(window, args);
+                };
+                var elem = document.createElement("script");
+                elem.src = pathToFile + fileName + ".deobfuscator.js";
+                elem.onload = function() {
+                    $teavm_deobfuscator([pathToFile + fileName + ".teavmdbg", pathToFile + fileName]);
+                };
+                document.head.append(elem);
+            };
+        }
+    }
+
+    if (!boot) {
+        installDeobfuscator();
+    }
+
     function startMain() {
         ws.close();
         window.removeEventListener("load", onLoad);
         document.body.removeChild(indicator.container);
+        installDeobfuscator();
         main();
     }
 
@@ -150,7 +180,7 @@
                         window.location.reload(true);
                     } else if (boot) {
                         var scriptElem = document.createElement("script");
-                        scriptElem.src = "FILE_NAME";
+                        scriptElem.src = pathToFile + fileName;
                         scriptElem.onload = startMain;
                         document.head.appendChild(scriptElem);
                     }
@@ -181,4 +211,4 @@
         window.addEventListener("message", connectDebugAgent);
         window.postMessage({teavmDebugger: {port: debugPort}}, "*");
     }
-})();
\ No newline at end of file
+})(this);
\ No newline at end of file
diff --git a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerConfiguration.java b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerConfiguration.java
index a67ccf2f7..de6eb2a7e 100644
--- a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerConfiguration.java
+++ b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerConfiguration.java
@@ -22,6 +22,7 @@ public class DevServerConfiguration {
     public String[] classPath;
     public String[] sourcePath;
     public boolean indicator;
+    public boolean deobfuscateStack;
     public boolean autoReload;
     public int port;
     public String pathToFile;
diff --git a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerRunner.java b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerRunner.java
index e1de02d8d..4fdb44dac 100644
--- a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerRunner.java
+++ b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/DevServerRunner.java
@@ -122,6 +122,9 @@ public class DevServerRunner extends UnicastRemoteObject implements DevServerMan
                 case "-i":
                     server.setIndicator(true);
                     break;
+                case "-deobf":
+                    server.setDeobfuscateStack(true);
+                    break;
                 case "-a":
                     server.setReloadedAutomatically(true);
                     break;
@@ -178,6 +181,9 @@ public class DevServerRunner extends UnicastRemoteObject implements DevServerMan
         if (options.indicator) {
             arguments.add("-i");
         }
+        if (options.deobfuscateStack) {
+            arguments.add("-deobf");
+        }
         if (options.autoReload) {
             arguments.add("-a");
         }
diff --git a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerConfiguration.java b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerConfiguration.java
index ced8298b6..2323bb265 100644
--- a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerConfiguration.java
+++ b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerConfiguration.java
@@ -44,6 +44,7 @@ public class TeaVMDevServerConfiguration extends ModuleBasedConfiguration<RunCon
     private String pathToFile = "";
     private String fileName = "classes.js";
     private boolean indicator = true;
+    private boolean deobfuscateStack = true;
     private boolean automaticallyReloaded;
     private int maxHeap = 1024;
     private String proxyUrl = "";
@@ -155,6 +156,16 @@ public class TeaVMDevServerConfiguration extends ModuleBasedConfiguration<RunCon
         this.indicator = indicator;
     }
 
+    @Property
+    @Tag
+    public boolean isDeobfuscateStack() {
+        return deobfuscateStack;
+    }
+
+    public void setDeobfuscateStack(boolean deobfuscateStack) {
+        this.deobfuscateStack = deobfuscateStack;
+    }
+
     @Property
     @Tag
     public boolean isAutomaticallyReloaded() {
diff --git a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerRunState.java b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerRunState.java
index 4b83378b2..8e5fbd716 100644
--- a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerRunState.java
+++ b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/TeaVMDevServerRunState.java
@@ -78,6 +78,7 @@ public class TeaVMDevServerRunState implements RunProfileState {
         config.fileName = configuration.getFileName();
         config.port = configuration.getPort();
         config.indicator = configuration.isIndicator();
+        config.deobfuscateStack = configuration.isDeobfuscateStack();
         config.autoReload = configuration.isAutomaticallyReloaded();
         config.mainClass = configuration.getMainClass();
         config.maxHeap = configuration.getMaxHeap();
diff --git a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/ui/TeaVMDevServerSettingsPanel.java b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/ui/TeaVMDevServerSettingsPanel.java
index e591e4cbf..51a3f7fc7 100644
--- a/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/ui/TeaVMDevServerSettingsPanel.java
+++ b/tools/idea/plugin/src/main/java/org/teavm/idea/devserver/ui/TeaVMDevServerSettingsPanel.java
@@ -48,6 +48,7 @@ public class TeaVMDevServerSettingsPanel extends JPanel {
     private JTextField pathToFileField;
     private JTextField fileNameField;
     private JCheckBox indicatorField;
+    private JCheckBox deobfuscateStackField;
     private JCheckBox autoReloadField;
     private JFormattedTextField maxHeapField;
     private JTextField proxyUrlField;
@@ -76,6 +77,7 @@ public class TeaVMDevServerSettingsPanel extends JPanel {
         fileNameField = new JTextField();
         pathToFileField = new JTextField();
         indicatorField = new JCheckBox("Display indicator on a web page:");
+        deobfuscateStackField = new JCheckBox("Deobfuscate stack traces in exceptions");
         autoReloadField = new JCheckBox("Reload page automatically:");
         maxHeapField = new JFormattedTextField(new DecimalFormat("#0"));
 
@@ -118,6 +120,7 @@ public class TeaVMDevServerSettingsPanel extends JPanel {
         add(pathToFileField, constraints);
 
         add(indicatorField, constraints);
+        add(deobfuscateStackField, constraints);
         add(autoReloadField, constraints);
 
         add(new JLabel("Server heap limit:"), labelConstraints);
@@ -137,6 +140,7 @@ public class TeaVMDevServerSettingsPanel extends JPanel {
         fileNameField.setText(configuration.getFileName());
         pathToFileField.setText(configuration.getPathToFile());
         indicatorField.setSelected(configuration.isIndicator());
+        deobfuscateStackField.setSelected(configuration.isDeobfuscateStack());
         autoReloadField.setSelected(configuration.isAutomaticallyReloaded());
         maxHeapField.setText(Integer.toString(configuration.getMaxHeap()));
         portField.setText(Integer.toString(configuration.getPort()));
@@ -151,6 +155,7 @@ public class TeaVMDevServerSettingsPanel extends JPanel {
         configuration.setFileName(fileNameField.getText().trim());
         configuration.setPathToFile(pathToFileField.getText().trim());
         configuration.setIndicator(indicatorField.isSelected());
+        configuration.setDeobfuscateStack(deobfuscateStackField.isSelected());
         configuration.setAutomaticallyReloaded(autoReloadField.isSelected());
         if (!maxHeapField.getText().trim().isEmpty()) {
             configuration.setMaxHeap(Integer.parseInt(maxHeapField.getText()));
diff --git a/tools/maven/plugin/src/main/java/org/teavm/maven/TeaVMCompileMojo.java b/tools/maven/plugin/src/main/java/org/teavm/maven/TeaVMCompileMojo.java
index aa6a6a237..e25558212 100644
--- a/tools/maven/plugin/src/main/java/org/teavm/maven/TeaVMCompileMojo.java
+++ b/tools/maven/plugin/src/main/java/org/teavm/maven/TeaVMCompileMojo.java
@@ -110,6 +110,9 @@ public class TeaVMCompileMojo extends AbstractMojo {
     @Parameter(property = "teavm.mainClass")
     private String mainClass;
 
+    @Parameter(property = "teavm.entryPointName", defaultValue = "main")
+    private String entryPointName;
+
     @Parameter
     private String[] classesToPreserve;
 
@@ -258,6 +261,7 @@ public class TeaVMCompileMojo extends AbstractMojo {
         builder.setLog(toolLog);
         try {
             builder.setMainClass(mainClass);
+            builder.setEntryPointName(entryPointName);
             if (!targetFileName.isEmpty()) {
                 builder.setTargetFileName(targetFileName);
             }