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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.bck2brwsr.aot;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.file.Path;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import net.orfjackal.retrolambda.Transformers;
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import net.orfjackal.retrolambda.asm.ClassReader;
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import net.orfjackal.retrolambda.asm.Opcodes;
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import net.orfjackal.retrolambda.files.OutputDirectory;
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import net.orfjackal.retrolambda.interfaces.ClassHierarchyAnalyzer;
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import net.orfjackal.retrolambda.lambdas.LambdaClassDumper;
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import net.orfjackal.retrolambda.lambdas.LambdaClassSaver;
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import org.apidesign.bck2brwsr.core.ExtraJavaScript;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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/**
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*
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* @author Jaroslav Tulach
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*/
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@ExtraJavaScript(processByteCode = false, resource="")
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final class RetroLambda extends OutputDirectory implements BytecodeProcessor {
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private Map<String,byte[]> converted;
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private final Transformers transformers;
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private final LambdaClassSaver saver;
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public RetroLambda() {
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super(null);
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transformers = new Transformers(Opcodes.V1_7, false, new ClassHierarchyAnalyzer());
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saver = new LambdaClassSaver(this, transformers);
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}
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@Override
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public void writeFile(Path relativePath, byte[] content) throws IOException {
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throw new UnsupportedOperationException();
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}
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@Override
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public void writeClass(byte[] bytecode) throws IOException {
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if (bytecode == null) {
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return;
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}
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ClassReader cr = new ClassReader(bytecode);
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String className = cr.getClassName();
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putBytecode(className + ".class", bytecode);
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}
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private void putBytecode(String className, byte[] backportedBytecode) {
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assert className.endsWith(".class") : "Full resource: " + className;
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if (converted == null) {
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converted = new HashMap<>();
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}
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converted.put(className, backportedBytecode);
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}
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@Override
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public Map<String, byte[]> process(
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String className, byte[] byteCode, Bck2Brwsr.Resources resources
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) throws IOException {
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int minor = byteCode[4] << 8 | byteCode[5];
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int major = byteCode[6] << 8 | byteCode[7];
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if (major <= 51) {
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return null;
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}
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ClassLoader prev = Thread.currentThread().getContextClassLoader();
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try (LambdaClassDumper dumper = new LambdaClassDumper(saver)) {
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Thread.currentThread().setContextClassLoader(new ResLdr(resources));
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dumper.install();
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byte[] newB = transformers.backportClass(new ClassReader(byteCode));
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if (!Arrays.equals(newB, byteCode)) {
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putBytecode(className, newB);
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}
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} catch (Throwable t) {
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t.printStackTrace();
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} finally {
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Thread.currentThread().setContextClassLoader(prev);
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}
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Map<String, byte[]> ret = converted;
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converted = null;
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return ret;
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}
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private static final class ResLdr extends ClassLoader {
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private final Bck2Brwsr.Resources res;
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public ResLdr(Bck2Brwsr.Resources res) {
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this.res = res;
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}
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@Override
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public Class<?> loadClass(String name) throws ClassNotFoundException {
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Class<?> c = findLoadedClass(name);
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if (c != null) {
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return c;
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}
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if (name.startsWith("java.")) {
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return super.loadClass(name);
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}
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String r = name.replace('.', '/') + ".class";
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try (InputStream is = res.get(r)) {
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if (is == null) {
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throw new ClassNotFoundException(name);
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}
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byte[] arr = Bck2BrwsrJars.readFrom(is);
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return defineClass(name, arr, 0, arr.length);
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} catch (IOException e) {
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return super.loadClass(name);
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}
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}
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}
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}
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