8031304: Add dcmd to print all loaded dynamic libraries.

Summary: Adding VM.dynlibs as a dcmd to dump all loaded dynamic libraries.
Reviewed-by: fparain, mgronlun

src/share/vm/services/diagnosticCommand.cpp

@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "gc_implementation/shared/vmGCOperations.hpp"
 #include "runtime/javaCalls.hpp"
+#include "runtime/os.hpp"
 #include "services/diagnosticArgument.hpp"
 #include "services/diagnosticCommand.hpp"
 #include "services/diagnosticFramework.hpp"
@@ -47,6 +48,7 @@ void DCmdRegistrant::register_dcmds(){
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CommandLineDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintSystemPropertiesDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintVMFlagsDCmd>(full_export, true, false));
+  DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMDynamicLibrariesDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMUptimeDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemGCDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<RunFinalizationDCmd>(full_export, true, false));
@@ -676,8 +678,7 @@ void JMXStartRemoteDCmd::execute(DCmdSource source, TRAPS) {
 }
 
 JMXStartLocalDCmd::JMXStartLocalDCmd(outputStream *output, bool heap_allocated) :
-  DCmd(output, heap_allocated)
-{
+  DCmd(output, heap_allocated) {
   // do nothing
 }
 
@@ -698,7 +699,6 @@ void JMXStartLocalDCmd::execute(DCmdSource source, TRAPS) {
     JavaCalls::call_static(&result, ik, vmSymbols::startLocalAgent_name(), vmSymbols::void_method_signature(), CHECK);
 }
 
-
 void JMXStopRemoteDCmd::execute(DCmdSource source, TRAPS) {
     ResourceMark rm(THREAD);
     HandleMark hm(THREAD);
@@ -716,6 +716,16 @@ void JMXStopRemoteDCmd::execute(DCmdSource source, TRAPS) {
     JavaCalls::call_static(&result, ik, vmSymbols::stopRemoteAgent_name(), vmSymbols::void_method_signature(), CHECK);
 }
 
+VMDynamicLibrariesDCmd::VMDynamicLibrariesDCmd(outputStream *output, bool heap_allocated) :
+  DCmd(output, heap_allocated) {
+  // do nothing
+}
+
+void VMDynamicLibrariesDCmd::execute(DCmdSource source, TRAPS) {
+  os::print_dll_info(output());
+  output()->cr();
+}
+
 void RotateGCLogDCmd::execute(DCmdSource source, TRAPS) {
   if (UseGCLogFileRotation) {
     VM_RotateGCLog rotateop(output());

src/share/vm/services/diagnosticCommand.hpp

@@ -132,6 +132,29 @@ public:
   virtual void execute(DCmdSource source, TRAPS);
 };
 
+class VMDynamicLibrariesDCmd : public DCmd {
+public:
+  VMDynamicLibrariesDCmd(outputStream* output, bool heap);
+  static const char* name() {
+    return "VM.dynlibs";
+  }
+  static const char* description() {
+    return "Print loaded dynamic libraries.";
+  }
+  static const char* impact() {
+    return "Low";
+  }
+  static const JavaPermission permission() {
+    JavaPermission p = {"java.lang.management.ManagementPermission",
+                        "monitor", NULL};
+    return p;
+  }
+  static int num_arguments() {
+    return 0;
+  };
+  virtual void execute(DCmdSource source, TRAPS);
+};
+
 class VMUptimeDCmd : public DCmdWithParser {
 protected:
   DCmdArgument<bool> _date;

test/TEST.groups

@@ -96,6 +96,7 @@ needs_jdk = \
   runtime/XCheckJniJsig/XCheckJSig.java \
   serviceability/attach/AttachWithStalePidFile.java \
   serviceability/sa/jmap-hprof/JMapHProfLargeHeapTest.java \
+  serviceability/dcmd/DynLibDcmdTest.java \
   testlibrary_tests/
 
 

test/serviceability/dcmd/DcmdUtil.java

+/*
+ * Copyright (c) 2013, 2017, 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 sun.management.ManagementFactoryHelper;
+
+import com.sun.management.DiagnosticCommandMBean;
+
+public class DcmdUtil
+{
+    public static String executeDcmd(String cmd, String ... args) {
+        DiagnosticCommandMBean dcmd = ManagementFactoryHelper.getDiagnosticCommandMBean();
+        Object[] dcmdArgs = {args};
+        String[] signature = {String[].class.getName()};
+
+        try {
+            System.out.print("> " + cmd + " ");
+            for (String s : args) {
+                System.out.print(s + " ");
+            }
+            System.out.println(":");
+            String result = (String) dcmd.invoke(transform(cmd), dcmdArgs, signature);
+            System.out.println(result);
+            return result;
+        } catch(Exception ex) {
+            ex.printStackTrace();
+        }
+        return null;
+    }
+
+    private static String transform(String name) {
+        StringBuilder sb = new StringBuilder();
+        boolean toLower = true;
+        boolean toUpper = false;
+        for (int i = 0; i < name.length(); i++) {
+            char c = name.charAt(i);
+            if (c == '.' || c == '_') {
+                toLower = false;
+                toUpper = true;
+            } else {
+                if (toUpper) {
+                    toUpper = false;
+                    sb.append(Character.toUpperCase(c));
+                } else if(toLower) {
+                    sb.append(Character.toLowerCase(c));
+                } else {
+                    sb.append(c);
+                }
+            }
+        }
+        return sb.toString();
+    }
+
+}

test/serviceability/dcmd/DynLibDcmdTest.java

+/*
+ * Copyright (c) 2013, 2017, 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 java.util.HashSet;
+import java.util.Set;
+import com.oracle.java.testlibrary.Platform;
+
+/*
+ * @test
+ * @summary Test of VM.dynlib diagnostic command via MBean
+ * @library /testlibrary
+ * @compile DcmdUtil.java
+ * @run main DynLibDcmdTest
+ */
+
+public class DynLibDcmdTest {
+
+    public static void main(String[] args) throws Exception {
+        String result = DcmdUtil.executeDcmd("VM.dynlibs");
+
+        String osDependentBaseString = null;
+        if (Platform.isSolaris()) {
+            osDependentBaseString = "lib%s.so";
+        } else if (Platform.isWindows()) {
+            osDependentBaseString = "%s.dll";
+        } else if (Platform.isOSX()) {
+            osDependentBaseString = "lib%s.dylib";
+        } else if (Platform.isLinux()) {
+            osDependentBaseString = "lib%s.so";
+        }
+
+        if (osDependentBaseString == null) {
+            throw new Exception("Unsupported OS");
+        }
+
+        Set<String> expectedContent = new HashSet<>();
+        expectedContent.add(String.format(osDependentBaseString, "jvm"));
+        expectedContent.add(String.format(osDependentBaseString, "java"));
+        expectedContent.add(String.format(osDependentBaseString, "management"));
+
+        for(String expected : expectedContent) {
+            if (!result.contains(expected)) {
+                throw new Exception("Dynamic library list output did not contain the expected string: '" + expected + "'");
+            }
+        }
+    }
+}