Mercurial > hg > graal-jvmci-8
diff jvmci/jdk.vm.ci.options/src/jdk/vm/ci/options/JVMCIJarsOptionDescriptorsProvider.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
---|---|
date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.options/src/jdk/internal/jvmci/options/JVMCIJarsOptionDescriptorsProvider.java@5cd42bb63fad |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jvmci/jdk.vm.ci.options/src/jdk/vm/ci/options/JVMCIJarsOptionDescriptorsProvider.java Thu Oct 08 17:28:41 2015 -0700 @@ -0,0 +1,129 @@ +/* + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * 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). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package jdk.vm.ci.options; + +import java.io.BufferedReader; +import java.io.File; +import java.io.IOException; +import java.io.InputStreamReader; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.jar.JarFile; +import java.util.zip.ZipEntry; + +import jdk.vm.ci.options.OptionsParser.OptionDescriptorsProvider; + +/** + * Access to the {@link OptionDescriptors} declared by + * {@code META-INF/services/jdk.vm.ci.options.OptionDescriptors} files in + * {@code <jre>/lib/jvmci/*.jar}. + */ +final class JVMCIJarsOptionDescriptorsProvider implements OptionDescriptorsProvider { + + static final String OptionDescriptorsServiceFile = "META-INF/services/" + OptionDescriptors.class.getName(); + + private final Iterator<File> jars; + private final List<OptionDescriptors> optionsDescriptorsList; + + /** + * Creates a {@link JVMCIJarsOptionDescriptorsProvider} if at least one JVMCI jar is available + * otherwise returns null. + */ + static JVMCIJarsOptionDescriptorsProvider create() { + List<File> jarsList = findJVMCIJars(); + if (jarsList.isEmpty()) { + return null; + } + return new JVMCIJarsOptionDescriptorsProvider(jarsList); + } + + private JVMCIJarsOptionDescriptorsProvider(List<File> jarsList) { + this.jars = jarsList.iterator(); + this.optionsDescriptorsList = new ArrayList<>(jarsList.size() * 3); + } + + /** + * Finds the list of JVMCI jars. + */ + private static List<File> findJVMCIJars() { + File javaHome = new File(System.getProperty("java.home")); + File lib = new File(javaHome, "lib"); + File jvmci = new File(lib, "jvmci"); + if (!jvmci.exists()) { + return Collections.emptyList(); + } + + List<File> jarFiles = new ArrayList<>(); + for (String fileName : jvmci.list()) { + if (fileName.endsWith(".jar")) { + File file = new File(jvmci, fileName); + if (file.isDirectory()) { + continue; + } + jarFiles.add(file); + } + } + return jarFiles; + } + + public OptionDescriptor get(String name) { + // Look up loaded option descriptors first + for (OptionDescriptors optionDescriptors : optionsDescriptorsList) { + OptionDescriptor desc = optionDescriptors.get(name); + if (desc != null) { + return desc; + } + } + while (jars.hasNext()) { + File path = jars.next(); + try (JarFile jar = new JarFile(path)) { + ZipEntry entry = jar.getEntry(OptionDescriptorsServiceFile); + if (entry != null) { + BufferedReader br = new BufferedReader(new InputStreamReader(jar.getInputStream(entry))); + String line = null; + OptionDescriptor desc = null; + while ((line = br.readLine()) != null) { + OptionDescriptors options; + try { + options = (OptionDescriptors) Class.forName(line).newInstance(); + optionsDescriptorsList.add(options); + if (desc == null) { + desc = options.get(name); + } + } catch (Exception e) { + throw new InternalError("Error instantiating class " + line + " read from " + path, e); + } + } + if (desc != null) { + return desc; + } + } + } catch (IOException e) { + throw new InternalError("Error reading " + path, e); + } + } + return null; + } +}