1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   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.
  22  */
  23 
  24 package compiler.jvmci.common;
  25 
  26 import java.lang.reflect.Field;
  27 import java.lang.reflect.Executable;
  28 import java.lang.reflect.Constructor;
  29 import java.lang.reflect.Method;
  30 import jdk.vm.ci.hotspot.CompilerToVMHelper;
  31 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethodImpl;
  32 
  33 public class CTVMUtilities {
  34     /*
  35      * A method to return HotSpotResolvedJavaMethod object using class object
  36      * and method as input
  37      */
  38     public static HotSpotResolvedJavaMethodImpl getResolvedMethod(Class<?> cls,
  39             Executable method) {
  40         if (!(method instanceof Method || method instanceof Constructor)) {
  41             throw new Error("wrong executable type " + method.getClass());
  42         }
  43         Field slotField;
  44         int slot;
  45         try {
  46             slotField = method.getClass().getDeclaredField("slot");
  47             boolean old = slotField.isAccessible();
  48             slotField.setAccessible(true);
  49             slot = slotField.getInt(method);
  50             slotField.setAccessible(old);
  51         } catch (ReflectiveOperationException e) {
  52             throw new Error("TEST BUG: Can't get slot field", e);
  53         }
  54         return CompilerToVMHelper.getResolvedJavaMethodAtSlot(cls, slot);
  55     }
  56 
  57     public static HotSpotResolvedJavaMethodImpl getResolvedMethod(
  58             Executable method) {
  59         return getResolvedMethod(method.getDeclaringClass(), method);
  60     }
  61 }