8225715: jhsdb jmap fails to write binary heap dump of a jshell process

Add a Null check for getSourceFileName() before writing into thread dump.

Reviewed-by: cjplummer, kevinw

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java

@@ -1098,10 +1098,15 @@ public class HeapHprofBinWriter extends AbstractHeapGraphWriter {
     private void writeSymbol(Symbol sym) throws IOException {
         // If name is already written don't write it again.
         if (names.add(sym)) {
-            byte[] buf = sym.asString().getBytes("UTF-8");
-            writeHeader(HPROF_UTF8, buf.length + OBJ_ID_SIZE);
-            writeSymbolID(sym);
-            out.write(buf);
+            if(sym != null) {
+              byte[] buf = sym.asString().getBytes("UTF-8");
+              writeHeader(HPROF_UTF8, buf.length + OBJ_ID_SIZE);
+              writeSymbolID(sym);
+              out.write(buf);
+           } else {
+              writeHeader(HPROF_UTF8, 0 + OBJ_ID_SIZE);
+              writeSymbolID(null);
+           }
         }
     }
 
@@ -1152,7 +1157,8 @@ public class HeapHprofBinWriter extends AbstractHeapGraphWriter {
 
     private void writeSymbolID(Symbol sym) throws IOException {
         assert names.contains(sym);
-        writeObjectID(getAddressValue(sym.getAddress()));
+        long address = (sym != null) ? getAddressValue(sym.getAddress()) : getAddressValue(null);
+        writeObjectID(address);
     }
 
     private void writeObjectID(long address) throws IOException {

test/jdk/sun/tools/jhsdb/JShellHeapDumpTest.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+/**
+ * @test
+ * @bug 8225715
+ * @requires vm.hasSAandCanAttach
+ * @library /test/lib
+ * @compile JShellHeapDumpTest.java
+ * @run main/timeout=240 JShellHeapDumpTest
+ */
+
+import static jdk.test.lib.Asserts.assertTrue;
+
+import java.io.IOException;
+import java.io.File;
+import java.util.List;
+import java.util.Arrays;
+import java.util.Map;
+
+import jdk.test.lib.JDKToolLauncher;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.hprof.parser.HprofReader;
+
+import jdk.jshell.JShell;
+
+public class JShellHeapDumpTest {
+
+    protected static Process process;
+
+    private static long pid;
+
+    public static void launch(String expectedMessage, List<String> toolArgs)
+        throws IOException {
+
+        try {
+            launchJshell();
+
+            System.out.println("Starting " + toolArgs.get(0) + " against " + pid);
+            JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");
+
+            for (String cmd : toolArgs) {
+                launcher.addToolArg(cmd);
+            }
+
+            launcher.addToolArg("--pid=" + Long.toString(pid));
+
+            ProcessBuilder processBuilder = new ProcessBuilder(launcher.getCommand());
+            processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
+            OutputAnalyzer output = ProcessTools.executeProcess(processBuilder);
+            System.out.println("stdout:");
+            System.out.println(output.getStdout());
+            System.out.println("stderr:");
+            System.out.println(output.getStderr());
+            output.shouldNotContain("null");
+            output.shouldHaveExitValue(0);
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        } finally {
+           if (process.isAlive()) {
+             process.destroy();
+           }
+        }
+    }
+
+    public static void launch(String expectedMessage, String... toolArgs)
+        throws IOException {
+
+        launch(expectedMessage, Arrays.asList(toolArgs));
+    }
+
+    public static void printStackTraces(String file) throws IOException {
+        try {
+            String output = HprofReader.getStack(file, 0);
+            if (!output.contains("JShellToolProvider")) {
+                throw new RuntimeException("'JShellToolProvider' missing from stdout/stderr");
+            }
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        }
+    }
+
+    public static void testHeapDump() throws IOException {
+        File dump = new File("jhsdb.jmap.heap." +
+                             System.currentTimeMillis() + ".hprof");
+        if (dump.exists()) {
+            dump.delete();
+        }
+
+        launch("heap written to", "jmap",
+               "--binaryheap", "--dumpfile=" + dump.getAbsolutePath());
+
+        assertTrue(dump.exists() && dump.isFile(),
+                   "Could not create dump file " + dump.getAbsolutePath());
+
+        printStackTraces(dump.getAbsolutePath());
+
+        dump.delete();
+    }
+
+    public static void launchJshell() throws IOException {
+        System.out.println("Starting Jshell");
+        String jdkPath = System.getProperty("test.jdk");
+        if (jdkPath == null) {
+          // we are not under jtreg, try env
+            Map<String, String> env = System.getenv();
+            jdkPath = env.get("TESTJAVA");
+        }
+        if (jdkPath == null) {
+            throw new RuntimeException("Can't determine jdk path neither test.jdk property no TESTJAVA env are set");
+        }
+        String osname = System.getProperty("os.name");
+        String jshell = jdkPath + ((osname.startsWith("window")) ? "/bin/jshell.exe" : "/bin/jshell");
+        process = Runtime.getRuntime().exec(jshell);
+        pid = process.pid();
+    }
+
+    public static void main(String[] args) throws Exception {
+
+        testHeapDump();
+
+        // The test throws RuntimeException on error.
+        // IOException is thrown if Jshell can't start because of some bad
+        // environment condition
+        System.out.println("Test PASSED");
+    }
+}