1 /*
   2  * Copyright (c) 2015, 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.code.CompilationRequestResult;
  27 import jdk.vm.ci.common.JVMCIError;
  28 import jdk.vm.ci.runtime.JVMCICompiler;
  29 import jdk.vm.ci.runtime.JVMCICompilerFactory;
  30 import jdk.vm.ci.runtime.JVMCIRuntime;
  31 import jdk.vm.ci.services.Services;
  32 
  33 final class HotSpotJVMCICompilerConfig {
  34 
  35     private static class DummyCompilerFactory implements JVMCICompilerFactory, JVMCICompiler {
  36 
  37         public CompilationRequestResult compileMethod(CompilationRequest request) {
  38             throw new JVMCIError("no JVMCI compiler selected");
  39         }
  40 
  41         public String getCompilerName() {
  42             return "<none>";
  43         }
  44 
  45         public JVMCICompiler createCompiler(JVMCIRuntime runtime) {
  46             return this;
  47         }
  48     }
  49 
  50     private static JVMCICompilerFactory compilerFactory;
  51 
  52     /**
  53      * Selects the system compiler.
  54      *
  55      * Called from VM. This method has an object return type to allow it to be called with a VM
  56      * utility function used to call other static initialization methods.
  57      */
  58     static Boolean selectCompiler(String compilerName) {
  59         assert compilerFactory == null;
  60         for (JVMCICompilerFactory factory : Services.load(JVMCICompilerFactory.class)) {
  61             if (factory.getCompilerName().equals(compilerName)) {
  62                 compilerFactory = factory;
  63                 return Boolean.TRUE;
  64             }
  65         }
  66 
  67         throw new JVMCIError("JVMCI compiler '%s' not found", compilerName);
  68     }
  69 
  70     static JVMCICompilerFactory getCompilerFactory() {
  71         if (compilerFactory == null) {
  72             compilerFactory = new DummyCompilerFactory();
  73         }
  74         return compilerFactory;
  75     }
  76 }