1 /*
   2  * Copyright (c) 2015, 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 jdk.vm.ci.hotspot;
  24 
  25 import java.lang.reflect.Module;
  26 
  27 import jdk.vm.ci.code.CompilationRequest;
  28 import jdk.vm.ci.code.CompilationRequestResult;
  29 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option;
  30 import jdk.vm.ci.runtime.JVMCICompiler;
  31 import jdk.vm.ci.runtime.JVMCIRuntime;
  32 import jdk.vm.ci.runtime.services.JVMCICompilerFactory;
  33 import jdk.vm.ci.services.Services;
  34 
  35 final class HotSpotJVMCICompilerConfig {
  36 
  37     private static class DummyCompilerFactory extends JVMCICompilerFactory implements JVMCICompiler {
  38 
  39         public CompilationRequestResult compileMethod(CompilationRequest request) {
  40             throw new InternalError("no JVMCI compiler selected");
  41         }
  42 
  43         @Override
  44         public String getCompilerName() {
  45             return "<none>";
  46         }
  47 
  48         @Override
  49         public JVMCICompiler createCompiler(JVMCIRuntime runtime) {
  50             return this;
  51         }
  52     }
  53 
  54     /**
  55      * Factory of the selected system compiler.
  56      */
  57     private static JVMCICompilerFactory compilerFactory;
  58 
  59     /**
  60      * Gets the selected system compiler factory.
  61      *
  62      * @return the selected system compiler factory
  63      */
  64     static JVMCICompilerFactory getCompilerFactory() {
  65         if (compilerFactory == null) {
  66             JVMCICompilerFactory factory = null;
  67             String compilerName = Option.Compiler.getString();
  68             if (compilerName != null) {
  69                 for (JVMCICompilerFactory f : Services.load(JVMCICompilerFactory.class)) {
  70                     if (f.getCompilerName().equals(compilerName)) {
  71                         Module jvmciModule = JVMCICompilerFactory.class.getModule();
  72                         Services.exportJVMCITo(f.getClass());
  73                         f.onSelection();
  74                         factory = f;
  75                     }
  76                 }
  77                 if (factory == null) {
  78                     throw new InternalError(String.format("JVMCI compiler '%s' not found", compilerName));
  79                 }
  80             } else {
  81                 factory = new DummyCompilerFactory();
  82             }
  83             compilerFactory = factory;
  84         }
  85         return compilerFactory;
  86     }
  87 }