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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package jdk.vm.ci.hotspot;

import jdk.vm.ci.code.CompilationRequest;
import jdk.vm.ci.common.JVMCIError;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option;
import jdk.vm.ci.runtime.JVMCICompiler;
import jdk.vm.ci.runtime.JVMCICompilerFactory;
import jdk.vm.ci.runtime.JVMCIRuntime;
import jdk.vm.ci.services.JVMCIPermission;
import jdk.vm.ci.services.JVMCIServiceLocator;
import jdk.vm.ci.services.internal.ReflectionAccessJDK;

final class HotSpotJVMCICompilerConfig {

    
This factory allows JVMCI initialization to succeed but raises an error if the VM asks JVMCI to perform a compilation. This allows the reflective parts of the JVMCI API to be used without requiring a compiler implementation to be available.
/** * This factory allows JVMCI initialization to succeed but raises an error if the VM asks JVMCI * to perform a compilation. This allows the reflective parts of the JVMCI API to be used * without requiring a compiler implementation to be available. */
private static class DummyCompilerFactory implements JVMCICompilerFactory, JVMCICompiler { public HotSpotCompilationRequestResult compileMethod(CompilationRequest request) { throw new JVMCIError("no JVMCI compiler selected"); } @Override public String getCompilerName() { return "null"; } @Override public JVMCICompiler createCompiler(JVMCIRuntime runtime) { return this; } }
Factory of the selected system compiler.
/** * Factory of the selected system compiler. */
private static JVMCICompilerFactory compilerFactory;
Gets the selected system compiler factory.
Throws:
Returns:the selected system compiler factory
/** * Gets the selected system compiler factory. * * @return the selected system compiler factory * @throws SecurityException if a security manager is present and it denies * {@link JVMCIPermission} for any {@link JVMCIServiceLocator} loaded by this method */
static JVMCICompilerFactory getCompilerFactory() { if (compilerFactory == null) { JVMCICompilerFactory factory = null; String compilerName = Option.Compiler.getString(); if (compilerName != null) { if (compilerName.isEmpty() || compilerName.equals("null")) { factory = new DummyCompilerFactory(); } else { for (JVMCICompilerFactory f : JVMCIServiceLocator.getProviders(JVMCICompilerFactory.class)) { if (f.getCompilerName().equals(compilerName)) { factory = f; } } if (factory == null) { throw new JVMCIError("JVMCI compiler '%s' not found", compilerName); } } } else { // Auto select a single available compiler for (JVMCICompilerFactory f : JVMCIServiceLocator.getProviders(JVMCICompilerFactory.class)) { if (factory == null) { ReflectionAccessJDK.openJVMCITo(f.getClass()); factory = f; } else { // Multiple factories seen - cancel auto selection factory = null; break; } } if (factory == null) { factory = new DummyCompilerFactory(); } } factory.onSelection(); compilerFactory = factory; } return compilerFactory; } }