1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
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  23 
  24 /*
  25  * @test
  26  * @bug 8174749 8213307
  27  * @summary MemberNameTable should reuse entries
  28  * @library /test/lib /runtime/testlibrary
  29  * @modules java.base/jdk.internal.misc
  30  * @modules java.compiler
  31  * @build sun.hotspot.WhiteBox
  32  * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
  33  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. MemberNameLeak
  34  */
  35 
  36 import java.lang.invoke.*;
  37 import java.lang.reflect.*;
  38 import jdk.test.lib.process.OutputAnalyzer;
  39 import jdk.test.lib.process.ProcessTools;
  40 import sun.hotspot.WhiteBox;
  41 import sun.hotspot.code.Compiler;
  42 import sun.hotspot.gc.GC;
  43 
  44 public class MemberNameLeak {
  45     private static String className  = "MemberNameLeakTestClass";
  46     private static String methodPrefix = "method";
  47     // The size of the ResolvedMethodTable is 1024. 2000 entries
  48     // is enough to trigger a grow/cleaning of the table after a GC.
  49     private static int methodCount = 2000;
  50 
  51     static class Leak {
  52       public void callMe() {
  53       }
  54 
  55       public static void main(String[] args) throws Throwable {
  56         Leak leak = new Leak();
  57         WhiteBox wb = WhiteBox.getWhiteBox();
  58 
  59         ClassWithManyMethodsClassLoader classLoader = new ClassWithManyMethodsClassLoader();
  60         Class<?> clazz = classLoader.create(className, methodPrefix, methodCount);
  61 
  62         long before = wb.resolvedMethodItemsCount();
  63 
  64         Object o = clazz.newInstance();
  65         MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
  66 
  67         for (int i = 0; i < methodCount; i++) {
  68           MethodType mt = MethodType.fromMethodDescriptorString("()V", classLoader);
  69           String methodName = methodPrefix + i;
  70           // findSpecial leaks some native mem
  71           // Add entry to ResolvedMethodTable.
  72           MethodHandle mh0 = lookup.findSpecial(clazz, methodName, mt, clazz);
  73           // Find entry in ResolvedMethodTable.
  74           MethodHandle mh1 = lookup.findSpecial(clazz, methodName, mt, clazz);
  75 
  76           mh1.invoke(o);
  77         }
  78 
  79         long after = wb.resolvedMethodItemsCount();
  80 
  81         if (after == before) {
  82           throw new RuntimeException("Too few resolved methods");
  83         }
  84 
  85         // Wait until ServiceThread cleans ResolvedMethod table
  86         int cnt = 0;
  87         while (true) {
  88           if (cnt++ % 30 == 0) {
  89             System.gc();  // make mh unused
  90           }
  91 
  92           if (after != wb.resolvedMethodItemsCount()) {
  93             // Entries have been removed.
  94             break;
  95           }
  96 
  97           Thread.sleep(100);
  98         }
  99       }
 100     }
 101 
 102     public static void test(GC gc, boolean doConcurrent) throws Throwable {
 103         System.err.println("test(" + gc + ", " + doConcurrent + ")");
 104         // Run this Leak class with logging
 105         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
 106                                       "-Xlog:membername+table=trace",
 107                                       "-XX:+UnlockExperimentalVMOptions",
 108                                       "-XX:+UnlockDiagnosticVMOptions",
 109                                       "-XX:+WhiteBoxAPI",
 110                                       "-Xbootclasspath/a:.",
 111                                       doConcurrent ? "-XX:+ExplicitGCInvokesConcurrent" : "-XX:-ExplicitGCInvokesConcurrent",
 112                                       "-XX:+ClassUnloading",
 113                                       "-XX:+ClassUnloadingWithConcurrentMark",
 114                                       "-XX:+Use" + gc + "GC",
 115                                       Leak.class.getName());
 116         OutputAnalyzer output = new OutputAnalyzer(pb.start());
 117         // Hardcoded names for classes generated by GeneratedClassLoader
 118         String descriptor = className + "." + methodPrefix + "0()V";
 119         output.shouldContain("ResolvedMethod entry added for " + descriptor);
 120         output.shouldContain("ResolvedMethod entry found for " + descriptor);
 121         output.shouldContain("ResolvedMethod entry removed");
 122         output.shouldHaveExitValue(0);
 123     }
 124 
 125     private static boolean supportsSTW(GC gc) {
 126         return !(gc == GC.Epsilon);
 127     }
 128 
 129     private static boolean supportsConcurrent(GC gc) {
 130         return !(gc == GC.Epsilon || gc == GC.Serial || gc == GC.Parallel);
 131     }
 132 
 133     private static void test(GC gc) throws Throwable {
 134         if (supportsSTW(gc)) {
 135             test(gc, false);
 136         }
 137         if (supportsConcurrent(gc)) {
 138             test(gc, true);
 139         }
 140     }
 141 
 142     public static void main(java.lang.String[] unused) throws Throwable {
 143       test(GC.selected());
 144     }
 145 }