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93 lines
4.4 KiB
Java
93 lines
4.4 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package previewfeature;
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import com.sun.source.util.JavacTask;
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import com.sun.source.util.Trees;
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import java.io.StringWriter;
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import java.lang.reflect.Field;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.stream.Collectors;
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import javax.lang.model.element.ElementKind;
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import javax.tools.ToolProvider;
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/* Construct a hybrid PreviewFeature.Feature enum that includes constants both
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* from the current JDK sources (so that they can be used in the javac API sources),
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* and from the bootstrap JDK (so that they can be used in the bootstrap classfiles).
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*
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* This hybrid enum is only used for the interim javac.
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*/
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public class SetupPreviewFeature {
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public static void main(String... args) throws Exception {
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Class<?> runtimeFeature = Class.forName("jdk.internal.javac.PreviewFeature$Feature");
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Set<String> constantsToAdd = new HashSet<>();
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for (Field runtimeField : runtimeFeature.getDeclaredFields()) {
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if (runtimeField.isEnumConstant()) {
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constantsToAdd.add(runtimeField.getName());
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}
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}
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var dummy = new StringWriter();
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var compiler = ToolProvider.getSystemJavaCompiler();
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var source = Path.of(args[0]);
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try (var fm = compiler.getStandardFileManager(null, null, null)) {
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JavacTask task =
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(JavacTask) compiler.getTask(dummy, null, null, null, null, fm.getJavaFileObjects(source));
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task.analyze();
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var sourceFeature = task.getElements()
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.getTypeElement("jdk.internal.javac.PreviewFeature.Feature");
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int insertPosition = -1;
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for (var el : sourceFeature.getEnclosedElements()) {
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if (el.getKind() == ElementKind.ENUM_CONSTANT) {
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constantsToAdd.remove(el.getSimpleName().toString());
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if (insertPosition == (-1)) {
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var trees = Trees.instance(task);
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var elPath = trees.getPath(el);
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insertPosition = (int) trees.getSourcePositions()
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.getStartPosition(elPath.getCompilationUnit(),
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elPath.getLeaf());
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}
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}
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}
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var target = Path.of(args[1]);
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Files.createDirectories(target.getParent());
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if (constantsToAdd.isEmpty()) {
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Files.copy(source, target);
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} else {
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String sourceCode = Files.readString(source);
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try (var out = Files.newBufferedWriter(target)) {
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out.write(sourceCode, 0, insertPosition);
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out.write(constantsToAdd.stream()
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.collect(Collectors.joining(", ",
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"/*compatibility constants:*/ ",
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",\n")));
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out.write(sourceCode, insertPosition, sourceCode.length() - insertPosition);
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}
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}
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}
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}
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} |