1 /*
   2  * Copyright (c) 2016, 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 package org.graalvm.compiler.test;
  24 
  25 import java.lang.reflect.Method;
  26 
  27 /**
  28  * Facade for the {@code java.lang.reflect.Module} class introduced in JDK9 that allows tests to be
  29  * developed against JDK8 but use module logic if deployed on JDK9.
  30  */
  31 public class JLRModule {
  32 
  33     static {
  34         if (GraalTest.Java8OrEarlier) {
  35             throw new AssertionError("Use of " + JLRModule.class + " only allowed if " + GraalTest.class.getName() + ".JDK8OrEarlier is false");
  36         }
  37     }
  38 
  39     private final Object realModule;
  40 
  41     public JLRModule(Object module) {
  42         this.realModule = module;
  43     }
  44 
  45     private static final Class<?> moduleClass;
  46     private static final Method getModuleMethod;
  47     private static final Method getUnnamedModuleMethod;
  48     private static final Method getPackagesMethod;
  49     private static final Method isExportedMethod;
  50     private static final Method isExported2Method;
  51     private static final Method addExportsMethod;
  52     static {
  53         try {
  54             moduleClass = Class.forName("java.lang.reflect.Module");
  55             getModuleMethod = Class.class.getMethod("getModule");
  56             getUnnamedModuleMethod = ClassLoader.class.getMethod("getUnnamedModule");
  57             getPackagesMethod = moduleClass.getMethod("getPackages");
  58             isExportedMethod = moduleClass.getMethod("isExported", String.class);
  59             isExported2Method = moduleClass.getMethod("isExported", String.class, moduleClass);
  60             addExportsMethod = moduleClass.getMethod("addExports", String.class, moduleClass);
  61         } catch (Exception e) {
  62             throw new AssertionError(e);
  63         }
  64     }
  65 
  66     public static JLRModule fromClass(Class<?> cls) {
  67         try {
  68             return new JLRModule(getModuleMethod.invoke(cls));
  69         } catch (Exception e) {
  70             throw new AssertionError(e);
  71         }
  72     }
  73 
  74     public static JLRModule getUnnamedModuleFor(ClassLoader cl) {
  75         try {
  76             return new JLRModule(getUnnamedModuleMethod.invoke(cl));
  77         } catch (Exception e) {
  78             throw new AssertionError(e);
  79         }
  80     }
  81 
  82     /**
  83      * Exports all packages in this module to a given module.
  84      */
  85     public void exportAllPackagesTo(JLRModule module) {
  86         if (this != module) {
  87             for (String pkg : getPackages()) {
  88                 // Export all JVMCI packages dynamically instead
  89                 // of requiring a long list of -XaddExports
  90                 // options on the JVM command line.
  91                 if (!isExported(pkg, module)) {
  92                     addExports(pkg, module);
  93                 }
  94             }
  95         }
  96     }
  97 
  98     public String[] getPackages() {
  99         try {
 100             return (String[]) getPackagesMethod.invoke(realModule);
 101         } catch (Exception e) {
 102             throw new AssertionError(e);
 103         }
 104     }
 105 
 106     public boolean isExported(String pn) {
 107         try {
 108             return (Boolean) isExportedMethod.invoke(realModule, pn);
 109         } catch (Exception e) {
 110             throw new AssertionError(e);
 111         }
 112     }
 113 
 114     public boolean isExported(String pn, JLRModule other) {
 115         try {
 116             return (Boolean) isExported2Method.invoke(realModule, pn, other.realModule);
 117         } catch (Exception e) {
 118             throw new AssertionError(e);
 119         }
 120     }
 121 
 122     public void addExports(String pn, JLRModule other) {
 123         try {
 124             addExportsMethod.invoke(realModule, pn, other.realModule);
 125         } catch (Exception e) {
 126             throw new AssertionError(e);
 127         }
 128     }
 129 }