[JFR] Add compatibility for UnlockCommercialFeatures

Summary: add compatibility for UnlockCommercialFeatures

Test Plan: test/jfr/test_unlockCommercialFeatures_compatibility.sh

Reviewed-by: yfxhust, luchsh

Issue: https://github.com/alibaba/dragonwell8_hotspot/issues/6

src/share/vm/jfr/dcmd/jfrDcmds.cpp

@@ -626,6 +626,7 @@ bool register_jfr_dcmds() {
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JfrStartFlightRecordingDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JfrStopFlightRecordingDCmd>(full_export, true, false));
   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JfrConfigureFlightRecorderDCmd>(full_export, true, false));
+  DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JfrUnlockCommercialFeaturesDCmd>(full_export, true, false));
   return true;
 }
 

src/share/vm/jfr/dcmd/jfrDcmds.hpp

@@ -166,6 +166,25 @@ class JfrConfigureFlightRecorderDCmd : public DCmdWithParser {
   virtual void execute(DCmdSource source, TRAPS);
 };
 
+class JfrUnlockCommercialFeaturesDCmd : public DCmd {
+public:
+  JfrUnlockCommercialFeaturesDCmd(outputStream* output, bool heap) : DCmd(output, heap) { }
+  static const char* name() { return "VM.unlock_commercial_features"; }
+  static const char* description() {
+    return "Simulate commercial features unlocking for Alibaba Dragonwell8.";
+  }
+  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) {
+    UnlockCommercialFeatures = true;
+  }
+};
+
 bool register_jfr_dcmds();
 
 #endif // SHARE_VM_JFR_JFRDCMDS_HPP

src/share/vm/runtime/globals.hpp

@@ -4027,6 +4027,9 @@ class CommandLineFlags {
                                                                             \
   product(bool, EnableJFR, false, "Enable JFR feature")                     \
                                                                             \
+  product(bool, UnlockCommercialFeatures, false,                            \
+          "This flag is ignored. Left for compatibility")                   \
+                                                                            \
   lp64_product(bool, CompilationWarmUpRecording, false,                     \
           "Collect profiling information for JWarmUP")                      \
                                                                             \

test/jfr/test_unlockCommercialFeatures_compatibility.sh

+#!/usr/bin/env bash
+#
+# @test
+# @summary Test 'jcmd VM.unlock_commercial_features'
+# @run shell/timeout=500 test_unlockCommercialFeatures_compatibility.sh
+#
+
+if [ "${TESTSRC}" = "" ]
+then
+    TESTSRC=${PWD}
+    echo "TESTSRC not set.  Using "${TESTSRC}" as default"
+fi
+echo "TESTSRC=${TESTSRC}"
+## Adding common setup Variables for running shell tests.
+. ${TESTSRC}/../test_env.sh
+
+JAVA=${TESTJAVA}${FS}bin${FS}java
+JAVAC=${TESTJAVA}${FS}bin${FS}javac
+JCMD=${TESTJAVA}${FS}bin${FS}jcmd
+JPS=${TESTJAVA}${FS}bin${FS}jps
+
+# A simple testcase used to invoke JVM
+TEST_CLASS=Test_$(date +%Y%m%d%H%M%S)
+TEST_SOURCE=$TEST_CLASS.java
+
+cat > $TEST_SOURCE << EOF
+public class ${TEST_CLASS} {
+    public static void main(String[] args) throws Exception{
+        // keep Java process running
+        while (true) { Thread.sleep(1000); }
+    }
+}
+EOF
+
+# compile the test class
+$JAVAC $TEST_SOURCE
+if [ $? != '0' ]; then
+    echo "Failed to compile ${TEST_SOURCE}"
+    exit 1
+fi
+
+${JAVA} -XX:+EnableJFR -cp . ${TEST_CLASS}&
+
+PID=$(${JPS} | grep ${TEST_CLASS} | awk '{print $1}')
+if [ $? != 0 ] || [ -z "${PID}" ]; then exit 1; fi
+
+${JCMD} ${PID} VM.unlock_commercial_features
+if [ $? != 0 ]; then exit 1; fi
+
+kill -9 ${PID}
+exit 0