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annotate graal/com.oracle.nfi/src/com/oracle/nfi/NativeFunctionInterfaceRuntime.java @ 21894:91b861398ad6

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removed dependency from NFI to JVMCI
author Doug Simon <doug.simon@oracle.com>
date Wed, 10 Jun 2015 16:10:26 +0200
parents 2f92172fa320
children
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.nfi;
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24
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25 import java.lang.reflect.*;
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26
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27 import com.oracle.nfi.api.*;
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28
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29 /**
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30 * Class for obtaining the {@link NativeFunctionInterface} (if any) provided by the VM.
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31 */
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32 public final class NativeFunctionInterfaceRuntime {
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33 private static final NativeFunctionInterface INSTANCE;
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34
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35 /**
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36 * Gets the {@link NativeFunctionInterface} (if any) provided by the VM.
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37 *
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38 * @return null if the VM does not provide a {@link NativeFunctionInterface}
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39 */
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40 public static NativeFunctionInterface getNativeFunctionInterface() {
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41 return INSTANCE;
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42 }
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43
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44 static {
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45
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46 NativeFunctionInterface instance = null;
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47
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48 NativeFunctionInterfaceAccess access = null;
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49 Class<?> servicesClass = null;
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50 try {
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51 servicesClass = Class.forName("com.oracle.jvmci.service.Services");
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52 } catch (ClassNotFoundException e) {
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53 // JVMCI is unavailable
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54 }
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55 if (servicesClass != null) {
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56 try {
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57 Method m = servicesClass.getDeclaredMethod("loadSingle", Class.class, boolean.class);
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58 access = (NativeFunctionInterfaceAccess) m.invoke(null, NativeFunctionInterfaceAccess.class, false);
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59 } catch (Throwable e) {
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60 // Fail fast for other errors
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61 throw (InternalError) new InternalError().initCause(e);
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62 }
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63 }
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64 // TODO: try standard ServiceLoader?
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65 if (access != null) {
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66 instance = access.getNativeFunctionInterface();
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67 }
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68 INSTANCE = instance;
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69 }
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70 }