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.common.JVMCIError;
  30 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option;
  31 import jdk.vm.ci.runtime.JVMCICompiler;
  32 import jdk.vm.ci.runtime.JVMCIRuntime;
  33 import jdk.vm.ci.runtime.services.JVMCICompilerFactory;
  34 import jdk.vm.ci.services.Services;
  35 
  36 final class HotSpotJVMCICompilerConfig {
  37 
  38     private static class DummyCompilerFactory extends JVMCICompilerFactory implements JVMCICompiler {
  39 
  40         public CompilationRequestResult compileMethod(CompilationRequest request) {
  41             throw new JVMCIError("no JVMCI compiler selected");
  42         }
  43 
  44         @Override
  45         public String getCompilerName() {
  46             return "<none>";
  47         }
  48 
  49         @Override
  50         public JVMCICompiler createCompiler(JVMCIRuntime runtime) {
  51             return this;
  52         }
  53     }
  54 
  55     /**
  56      * Factory of the selected system compiler.
  57      */
  58     private static JVMCICompilerFactory compilerFactory;
  59 
  60     /**
  61      * Gets the selected system compiler factory.
  62      *
  63      * @return the selected system compiler factory
  64      */
  65     static JVMCICompilerFactory getCompilerFactory() {
  66         if (compilerFactory == null) {
  67             JVMCICompilerFactory factory = null;
  68             String compilerName = Option.Compiler.getString();
  69             if (compilerName != null) {
  70                 for (JVMCICompilerFactory f : Services.load(JVMCICompilerFactory.class)) {
  71                     if (f.getCompilerName().equals(compilerName)) {
  72                         Module jvmciModule = JVMCICompilerFactory.class.getModule();
  73                         Services.exportJVMCITo(f.getClass());
  74                         f.onSelection();
  75                         factory = f;
  76                     }
  77                 }
  78                 if (factory == null) {
  79                     throw new JVMCIError("JVMCI compiler '%s' not found", compilerName);
  80                 }
  81             } else {
  82                 factory = new DummyCompilerFactory();
  83             }
  84             compilerFactory = factory;
  85         }
  86         return compilerFactory;
  87     }
  88 }