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.JVMCICompilerFactory; 30 import jdk.vm.ci.runtime.JVMCIRuntime; 31 import jdk.vm.ci.services.JVMCIServiceLocator; 32 import jdk.vm.ci.services.JVMCIPermission; 33 import jdk.vm.ci.services.Services; 34 35 final class HotSpotJVMCICompilerConfig { 36 37 /** 38 * This factory allows JVMCI initialization to succeed but raises an error if the VM asks JVMCI 39 * to perform a compilation. This allows the reflective parts of the JVMCI API to be used 40 * without requiring a compiler implementation to be available. 41 */ 42 private static class DummyCompilerFactory implements JVMCICompilerFactory, JVMCICompiler { 43 44 public HotSpotCompilationRequestResult compileMethod(CompilationRequest request) { 45 throw new JVMCIError("no JVMCI compiler selected"); 46 } 47 48 @Override 49 public String getCompilerName() { 50 return "<none>"; 51 } 52 53 @Override 54 public JVMCICompiler createCompiler(JVMCIRuntime runtime) { 55 return this; 56 } 57 } 58 59 /** 60 * Factory of the selected system compiler. 61 */ 62 private static JVMCICompilerFactory compilerFactory; 63 64 /** 65 * Gets the selected system compiler factory. 66 * 67 * @return the selected system compiler factory 68 * @throws SecurityException if a security manager is present and it denies 69 * {@link JVMCIPermission} for any {@link JVMCIServiceLocator} loaded by this method 70 */ 71 static JVMCICompilerFactory getCompilerFactory() { 72 if (compilerFactory == null) { 73 JVMCICompilerFactory factory = null; 74 String compilerName = Option.Compiler.getString(); 75 if (compilerName != null) { 76 for (JVMCICompilerFactory f : JVMCIServiceLocator.getProviders(JVMCICompilerFactory.class)) { 77 if (f.getCompilerName().equals(compilerName)) { 78 factory = f; 79 } 80 } 81 if (factory == null) { 82 throw new JVMCIError("JVMCI compiler '%s' not found", compilerName); 83 } 84 } else { 85 // Auto select a single available compiler 86 for (JVMCICompilerFactory f : JVMCIServiceLocator.getProviders(JVMCICompilerFactory.class)) { 87 if (factory == null) { 88 Services.exportJVMCITo(f.getClass()); 89 factory = f; 90 } else { 91 // Multiple factories seen - cancel auto selection 92 factory = null; 93 break; 94 } 95 } 96 if (factory == null) { 97 factory = new DummyCompilerFactory(); 98 } 99 } 100 factory.onSelection(); 101 compilerFactory = factory; 102 } 103 return compilerFactory; 104 } 105 }