1 /*
   2  * Copyright (c) 2015, 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.internal.jvmci.hotspot;
  24 
  25 import jdk.internal.jvmci.code.*;
  26 import jdk.internal.jvmci.common.*;
  27 import jdk.internal.jvmci.compiler.*;
  28 import jdk.internal.jvmci.compiler.Compiler;
  29 import jdk.internal.jvmci.meta.*;
  30 import jdk.internal.jvmci.runtime.*;
  31 import jdk.internal.jvmci.service.*;
  32 
  33 final class HotSpotJVMCICompilerConfig {
  34 
  35     private static class DummyCompilerFactory implements CompilerFactory, Compiler {
  36 
  37         public void compileMethod(ResolvedJavaMethod method, int entryBCI, long jvmciEnv, int id) {
  38             throw new JVMCIError("no JVMCI compiler selected");
  39         }
  40 
  41         public String getCompilerName() {
  42             return "<none>";
  43         }
  44 
  45         public Architecture initializeArchitecture(Architecture arch) {
  46             return arch;
  47         }
  48 
  49         public Compiler createCompiler(JVMCIRuntime runtime) {
  50             return this;
  51         }
  52     }
  53 
  54     private static CompilerFactory compilerFactory;
  55 
  56     /**
  57      * Selects the system compiler.
  58      *
  59      * Called from VM. This method has an object return type to allow it to be called with a VM
  60      * utility function used to call other static initialization methods.
  61      */
  62     static Boolean selectCompiler(String compilerName) {
  63         assert compilerFactory == null;
  64         for (CompilerFactory factory : Services.load(CompilerFactory.class)) {
  65             if (factory.getCompilerName().equals(compilerName)) {
  66                 compilerFactory = factory;
  67                 return Boolean.TRUE;
  68             }
  69         }
  70 
  71         throw new JVMCIError("JVMCI compiler '%s' not found", compilerName);
  72     }
  73 
  74     static CompilerFactory getCompilerFactory() {
  75         if (compilerFactory == null) {
  76             compilerFactory = new DummyCompilerFactory();
  77         }
  78         return compilerFactory;
  79     }
  80 }