JDK-8317920: JDWP-agent sends broken exception event with onthrow option

src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c

@@ -102,7 +102,7 @@ static void JNICALL cbEarlyVMDeath(jvmtiEnv*, JNIEnv *);
 static void JNICALL cbEarlyException(jvmtiEnv*, JNIEnv *,
             jthread, jmethodID, jlocation, jobject, jmethodID, jlocation);
 
-static void initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei);
+static void initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei, EventInfo *opt_info);
 static jboolean parseOptions(char *str);
 
 /*
@@ -391,7 +391,7 @@ cbEarlyVMInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread)
         EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead at VM_INIT time");
     }
     if (initOnStartup)
-        initialize(env, thread, EI_VM_INIT);
+        initialize(env, thread, EI_VM_INIT, NULL);
     vmInitialized = JNI_TRUE;
     LOG_MISC(("END cbEarlyVMInit"));
 }
@@ -444,6 +444,19 @@ cbEarlyException(jvmtiEnv *jvmti_env, JNIEnv *env,
         LOG_MISC(("VM is not initialized yet"));
         return;
     }
+    EventInfo info;
+    info.ei = EI_EXCEPTION;
+    info.thread = thread;
+    info.clazz = getMethodClass(jvmti_env, method);
+    info.method = method;
+    info.location = location;
+    info.object = exception;
+    if (gdata->vthreadsSupported) {
+        info.is_vthread = isVThread(thread);
+    }
+    info.u.exception.catch_clazz = getMethodClass(jvmti_env, catch_method);
+    info.u.exception.catch_method = catch_method;
+    info.u.exception.catch_location = catch_location;
 
     /*
      * We want to preserve any current exception that might get wiped
@@ -458,24 +471,22 @@ cbEarlyException(jvmtiEnv *jvmti_env, JNIEnv *env,
     if (initOnUncaught && catch_method == NULL) {
 
         LOG_MISC(("Initializing on uncaught exception"));
-        initialize(env, thread, EI_EXCEPTION);
+        initialize(env, thread, EI_EXCEPTION, &info);
 
     } else if (initOnException != NULL) {
 
-        jclass clazz;
-
-        /* Get class of exception thrown */
-        clazz = JNI_FUNC_PTR(env,GetObjectClass)(env, exception);
-        if ( clazz != NULL ) {
+        jclass exception_clazz = JNI_FUNC_PTR(env, GetObjectClass)(env, exception);
+        /* check class of exception thrown */
+        if ( exception_clazz != NULL ) {
             char *signature = NULL;
             /* initing on throw, check */
-            error = classSignature(clazz, &signature, NULL);
+            error = classSignature(exception_clazz, &signature, NULL);
             LOG_MISC(("Checking specific exception: looking for %s, got %s",
                         initOnException, signature));
             if ( (error==JVMTI_ERROR_NONE) &&
                 (strcmp(signature, initOnException) == 0)) {
                 LOG_MISC(("Initializing on specific exception"));
-                initialize(env, thread, EI_EXCEPTION);
+                initialize(env, thread, EI_EXCEPTION, &info);
             } else {
                 error = AGENT_ERROR_INTERNAL; /* Just to cause restore */
             }
@@ -616,9 +627,11 @@ jniFatalError(JNIEnv *env, const char *msg, jvmtiError error, int exit_code)
 
 /*
  * Initialize debugger back end modules
+ *
+ * @param opt_info optional event info to use, might be null
  */
 static void
-initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei)
+initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei, EventInfo *opt_info)
 {
     jvmtiError error;
     EnumerateArg arg;
@@ -712,6 +725,9 @@ initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei)
         initEventBag = eventHelper_createEventBag();
         (void)memset(&info,0,sizeof(info));
         info.ei = triggering_ei;
+        if (opt_info != NULL) {
+            info = *opt_info;
+        }
         eventHelper_recordEvent(&info, 0, suspendPolicy, initEventBag);
         (void)eventHelper_reportEvents(currentSessionID, initEventBag);
         bagDestroyBag(initEventBag);
@@ -1368,7 +1384,7 @@ JNIEXPORT char const* JNICALL debugInit_startDebuggingViaCommand(JNIEnv* env, jt
     if (!startedViaJcmd) {
         startedViaJcmd = JNI_TRUE;
         is_first_start = JNI_TRUE;
-        initialize(env, thread, EI_VM_INIT);
+        initialize(env, thread, EI_VM_INIT, NULL);
     }
 
     bagEnumerateOver(transports, getFirstTransport, &spec);

test/jdk/com/sun/jdi/JdwpOnThrowTest.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2019, 2023, 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.
+ *
+ * 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.
+ */
+
+import com.sun.jdi.Bootstrap;
+import com.sun.jdi.VirtualMachine;
+import com.sun.jdi.connect.AttachingConnector;
+import com.sun.jdi.connect.Connector;
+import com.sun.jdi.connect.IllegalConnectorArgumentsException;
+import com.sun.jdi.connect.ListeningConnector;
+import com.sun.jdi.event.EventIterator;
+import com.sun.jdi.event.EventQueue;
+import com.sun.jdi.event.EventSet;
+import com.sun.jdi.event.Event;
+import com.sun.jdi.event.ExceptionEvent;
+import com.sun.jdi.request.EventRequestManager;
+import jdk.test.lib.Utils;
+import lib.jdb.Debuggee;
+
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+/*
+ * @test
+ * @bug 8317920
+ * @summary Tests for JDWP agent to send valid exception event with onthrow option
+ * @library /test/lib
+ *
+ * @build ThrowCaughtException JdwpOnThrowTest
+ * @run main/othervm JdwpOnThrowTest
+ */
+public class JdwpOnThrowTest {
+
+    private static long TIMEOUT = 10000;
+
+    public static void main(String[] args) throws Exception {
+        int port = findFreePort();
+        try (Debuggee debuggee = Debuggee.launcher("ThrowCaughtException").setAddress("localhost:" + port)
+                                         .enableOnThrow("Ex", "Start").setSuspended(true).launch()) {
+            VirtualMachine vm = null;
+            try {
+                vm = attach("localhost", "" + port);
+                EventQueue queue = vm.eventQueue();
+                log("Waiting for exception event");
+                long start = System.currentTimeMillis();
+                while (start + TIMEOUT > System.currentTimeMillis()) {
+                    EventSet eventSet = queue.remove(TIMEOUT);
+                    EventIterator eventIterator = eventSet.eventIterator();
+                    while(eventIterator.hasNext() && start + TIMEOUT > System.currentTimeMillis()) {
+                        Event event = eventIterator.next();
+                        if (event instanceof ExceptionEvent ex) {
+                            if (ex.exception() == null) {
+                                throw new RuntimeException("Exception is null");
+                            }
+                            if (ex.exception().type() == null) {
+                                throw new RuntimeException("Exception type is null");
+                            }
+                            if (ex.exception().referenceType() == null) {
+                                throw new RuntimeException("Exception reference type is null");
+                            }
+                            if (ex.catchLocation() == null) {
+                                throw new RuntimeException("Exception catch location is null");
+                            }
+                            if (!ex.location().equals(ex.thread().frame(0).location())) {
+                                throw new RuntimeException(
+                                    String.format("Throw location %s and location if first frame %s are not equal",
+                                                  ex.location(), ex.thread().frame(0).location()));
+                            }
+                            if (!ex.exception().type().name().equals("Ex")) {
+                                throw new RuntimeException("Exception has wrong type: " + ex.exception().type().name());
+                            }
+                            log("Received exception event: " + event);
+                            vm.dispose();
+                            return;
+                        }
+                        log("Received event: " + event);
+                    }
+                }
+                throw new RuntimeException("ERROR: failed to receive exception event");
+            } catch (IOException ex) {
+                throw new RuntimeException("ERROR: failed to attach", ex);
+            }
+        }
+    }
+
+    private static int findFreePort() {
+        try (ServerSocket socket = new ServerSocket(0)) {
+            return socket.getLocalPort();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static String ATTACH_CONNECTOR = "com.sun.jdi.SocketAttach";
+    // cache socket attaching connector
+    private static AttachingConnector attachingConnector;
+
+    private static VirtualMachine attach(String address, String port) throws IOException {
+        if (attachingConnector == null) {
+            attachingConnector = (AttachingConnector)getConnector(ATTACH_CONNECTOR);
+        }
+        Map<String, Connector.Argument> args = attachingConnector.defaultArguments();
+        setConnectorArg(args, "hostname", address);
+        setConnectorArg(args, "port", port);
+        try {
+            return attachingConnector.attach(args);
+        } catch (IllegalConnectorArgumentsException e) {
+            // unexpected.. wrap in RuntimeException
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static Connector getConnector(String name) {
+        List<Connector> connectors = Bootstrap.virtualMachineManager().allConnectors();
+        for (Iterator<Connector> iter = connectors.iterator(); iter.hasNext(); ) {
+            Connector connector = iter.next();
+            if (connector.name().equalsIgnoreCase(name)) {
+                return connector;
+            }
+        }
+        throw new IllegalArgumentException("Connector " + name + " not found");
+    }
+
+    private static void setConnectorArg(Map<String, Connector.Argument> args, String name, String value) {
+        Connector.Argument arg = args.get(name);
+        if (arg == null) {
+            throw new IllegalArgumentException("Argument " + name + " is not defined");
+        }
+        arg.setValue(value);
+    }
+
+    private static void log(Object o) {
+        System.out.println(String.valueOf(o));
+    }
+
+}

test/jdk/com/sun/jdi/ThrowCaughtException.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2019, 2023, 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.
+ *
+ * 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.
+ */
+
+ public class ThrowCaughtException {
+    public static void main(String args[]) throws Exception {
+        try {
+            System.out.println("Start");
+            throw new Ex();
+        } catch (Exception e) {
+            System.out.println(e);
+        }
+    }
+}
+
+class Ex extends RuntimeException {
+}

test/jdk/com/sun/jdi/lib/jdb/Debuggee.java

@@ -68,6 +68,9 @@ public static class Launcher {
         private String transport = "dt_socket";
         private String address = null;
         private boolean suspended = true;
+        private String onthrow = "";
+        private boolean waitForPortPrint = true;
+        private String expectedOutputBeforeThrow = "";
 
         private Launcher(String mainClass) {
             this.mainClass = mainClass;
@@ -100,30 +103,52 @@ public Launcher setSuspended(boolean value) {
             return this;
         }
 
+        // required to pass non null port with address and emit string before the throw
+        public Launcher enableOnThrow(String value, String expectedOutputBeforeThrow) {
+            this.onthrow = value;
+            this.waitForPortPrint = false;
+            this.expectedOutputBeforeThrow = expectedOutputBeforeThrow;
+            return this;
+        }
+
         public ProcessBuilder prepare() {
             List<String> debuggeeArgs = new LinkedList<>();
             if (vmOptions != null) {
                 debuggeeArgs.add(vmOptions);
             }
+            String onthrowArgs = onthrow.isEmpty() ? "" : ",onthrow=" + onthrow + ",launch=exit";
             debuggeeArgs.add("-agentlib:jdwp=transport=" + transport
                     + (address == null ? "" : ",address=" + address)
-                    + ",server=y,suspend=" + (suspended ? "y" : "n"));
+                    + ",server=y,suspend=" + (suspended ? "y" : "n")
+                    + onthrowArgs);
             debuggeeArgs.addAll(options);
             debuggeeArgs.add(mainClass);
             return ProcessTools.createTestJvm(debuggeeArgs);
         }
 
         public Debuggee launch(String name) {
-            return new Debuggee(prepare(), name);
+            return new Debuggee(prepare(), name, waitForPortPrint, expectedOutputBeforeThrow);
         }
         public Debuggee launch() {
             return launch("debuggee");
         }
     }
 
     // starts the process, waits for "Listening for transport" output and detects transport/address
-    private Debuggee(ProcessBuilder pb, String name) {
+    private Debuggee(ProcessBuilder pb, String name, boolean waitForPortPrint, String expectedOutputBeforeThrow) {
         JDWP.ListenAddress[] listenAddress = new JDWP.ListenAddress[1];
+        if (!waitForPortPrint) {
+            try {
+                p = ProcessTools.startProcess(name, pb, s -> {output.add(s);}, s -> {
+                    return s.equals(expectedOutputBeforeThrow);
+                }, 30, TimeUnit.SECONDS);
+            } catch (IOException | InterruptedException | TimeoutException ex) {
+                throw new RuntimeException("failed to launch debuggee", ex);
+            }
+            transport = null;
+            address = null;
+            return;
+        }
         try {
             p = ProcessTools.startProcess(name, pb,
                     s -> output.add(s),  // output consumer
@@ -167,10 +192,16 @@ public String getOutput() {
     }
 
     String getTransport() {
+        if (address == null) {
+            throw new IllegalStateException("address is not available");
+        }
         return transport;
     }
 
     public String getAddress() {
+        if (address == null) {
+            throw new IllegalStateException("address is not available");
+        }
         return address;
     }