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 jdk.vm.ci.code.CompilationRequest;
  26 import jdk.vm.ci.common.JVMCIError;
  27 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option;
  28 import jdk.vm.ci.runtime.JVMCICompiler;
  29 import jdk.vm.ci.runtime.JVMCIRuntime;
  30 import jdk.vm.ci.runtime.services.JVMCICompilerFactory;
  31 import jdk.vm.ci.services.Services;
  32 
  33 final class HotSpotJVMCICompilerConfig {
  34 
  35     /**
  36      * This factory allows JVMCI initialization to succeed but raises an error if the VM asks JVMCI
  37      * to perform a compilation. This allows the reflective parts of the JVMCI API to be used
  38      * without requiring a compiler implementation to be available.
  39      */
  40     private static class DummyCompilerFactory extends JVMCICompilerFactory implements JVMCICompiler {
  41 
  42         public HotSpotCompilationRequestResult compileMethod(CompilationRequest request) {
  43             throw new JVMCIError("no JVMCI compiler selected");
  44         }
  45 
  46         @Override
  47         public String getCompilerName() {
  48             return "<none>";
  49         }
  50 
  51         @Override
  52         public JVMCICompiler createCompiler(JVMCIRuntime runtime) {
  53             return this;
  54         }
  55     }
  56 
  57     /**
  58      * Factory of the selected system compiler.
  59      */
  60     private static JVMCICompilerFactory compilerFactory;
  61 
  62     /**
  63      * Gets the selected system compiler factory.
  64      *
  65      * @return the selected system compiler factory
  66      */
  67     static JVMCICompilerFactory getCompilerFactory() {
  68         if (compilerFactory == null) {
  69             JVMCICompilerFactory factory = null;
  70             String compilerName = Option.Compiler.getString();
  71             if (compilerName != null) {
  72                 for (JVMCICompilerFactory f : Services.load(JVMCICompilerFactory.class)) {
  73                     if (f.getCompilerName().equals(compilerName)) {
  74                         Services.exportJVMCITo(f.getClass());
  75                         factory = f;
  76                     }
  77                 }
  78                 if (factory == null) {
  79                     throw new JVMCIError("JVMCI compiler '%s' not found", compilerName);
  80                 }
  81             } else {
  82                 // Auto select a single available compiler
  83                 for (JVMCICompilerFactory f : Services.load(JVMCICompilerFactory.class)) {
  84                     if (factory == null) {
  85                         factory = f;
  86                     } else {
  87                         // Multiple factories seen - cancel auto selection
  88                         factory = null;
  89                         break;
  90                     }
  91                 }
  92                 if (factory == null) {
  93                     factory = new DummyCompilerFactory();
  94                 }
  95             }
  96             factory.onSelection();
  97             compilerFactory = factory;
  98         }
  99         return compilerFactory;
 100     }
 101 }