1 /*
   2  * Copyright (c) 2019, 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 
  25 package jdk.internal.vm.compiler.libgraal;
  26 
  27 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
  28 import jdk.vm.ci.services.Services;
  29 
  30 /**
  31  * JDK13+ version of {@code LibGraal}.
  32  */
  33 public class LibGraal {
  34 
  35     public static boolean isAvailable() {
  36         return inLibGraal() || isolate != 0L;
  37     }
  38 
  39     public static boolean inLibGraal() {
  40         return Services.IS_IN_NATIVE_IMAGE;
  41     }
  42 
  43     public static void registerNativeMethods(HotSpotJVMCIRuntime runtime, Class<?> clazz) {
  44         if (clazz.isPrimitive()) {
  45             throw new IllegalArgumentException();
  46         }
  47         if (inLibGraal() || !isAvailable()) {
  48             throw new IllegalStateException();
  49         }
  50         runtime.registerNativeMethods(clazz);
  51     }
  52 
  53     public static long translate(HotSpotJVMCIRuntime runtime, Object obj) {
  54         if (!isAvailable()) {
  55             throw new IllegalStateException();
  56         }
  57         if (!inLibGraal() && LibGraalScope.currentScope.get() == null) {
  58             throw new IllegalStateException("Not within a " + LibGraalScope.class.getName());
  59         }
  60         return runtime.translate(obj);
  61     }
  62 
  63     public static <T> T unhand(HotSpotJVMCIRuntime runtime, Class<T> type, long handle) {
  64         if (!isAvailable()) {
  65             throw new IllegalStateException();
  66         }
  67         if (!inLibGraal() && LibGraalScope.currentScope.get() == null) {
  68             throw new IllegalStateException("Not within a " + LibGraalScope.class.getName());
  69         }
  70         return runtime.unhand(type, handle);
  71     }
  72 
  73     private static long initializeLibgraal() {
  74         try {
  75             // Initialize JVMCI to ensure JVMCI opens its packages to
  76             // Graal otherwise the call to HotSpotJVMCIRuntime.runtime()
  77             // below will fail on JDK13+.
  78             Services.initializeJVMCI();
  79 
  80             HotSpotJVMCIRuntime runtime = HotSpotJVMCIRuntime.runtime();
  81             long[] nativeInterface = runtime.registerNativeMethods(LibGraal.class);
  82             return nativeInterface[1];
  83         } catch (UnsupportedOperationException e) {
  84             return 0L;
  85         }
  86     }
  87 
  88     static final long isolate = Services.IS_BUILDING_NATIVE_IMAGE ? 0L : initializeLibgraal();
  89 
  90     static boolean isCurrentThreadAttached(HotSpotJVMCIRuntime runtime) {
  91         return runtime.isCurrentThreadAttached();
  92     }
  93 
  94     static boolean attachCurrentThread(HotSpotJVMCIRuntime runtime) {
  95         return runtime.attachCurrentThread(false);
  96     }
  97 
  98     static void detachCurrentThread(HotSpotJVMCIRuntime runtime) {
  99         runtime.detachCurrentThread();
 100     }
 101 
 102     static native long getCurrentIsolateThread(long iso);
 103 }