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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 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.launcher.fximpl;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.ArrayList;
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import java.util.List;
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import org.objectweb.asm.AnnotationVisitor;
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import org.objectweb.asm.ClassReader;
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import org.objectweb.asm.ClassVisitor;
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import org.objectweb.asm.ClassWriter;
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import org.objectweb.asm.Label;
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import org.objectweb.asm.MethodVisitor;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.Type;
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/**
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*
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* @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*/
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abstract class JsClassLoader extends URLClassLoader {
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JsClassLoader(URL[] urls, ClassLoader parent) {
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super(urls, parent);
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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URL u = findResource(name.replace('.', '/') + ".class");
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if (u != null) {
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InputStream is = null;
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try {
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is = u.openStream();
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ClassReader cr = new ClassReader(is);
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ClassWriter w = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
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FindInClass fic = new FindInClass(w);
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cr.accept(fic, 0);
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byte[] arr = w.toByteArray();
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return defineClass(name, arr, 0, arr.length);
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} catch (IOException ex) {
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throw new ClassNotFoundException("Can't load " + name, ex);
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} finally {
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try {
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if (is != null) is.close();
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} catch (IOException ex) {
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throw new ClassNotFoundException(null, ex);
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}
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}
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}
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if (name.startsWith("org.apidesign.bck2brwsr.launcher.fximpl.Fn")) {
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return Class.forName(name);
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}
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return super.findClass(name);
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}
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protected abstract Fn defineFn(String code, String... names);
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private static final class FindInClass extends ClassVisitor {
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private String name;
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public FindInClass(ClassVisitor cv) {
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super(Opcodes.ASM4, cv);
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}
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@Override
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public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
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this.name = name;
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super.visit(version, access, name, signature, superName, interfaces);
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}
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@Override
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public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
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return new FindInMethod(name,
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super.visitMethod(access, name, desc, signature, exceptions)
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);
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}
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private final class FindInMethod extends MethodVisitor {
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private final String name;
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private List<String> args;
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private String body;
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public FindInMethod(String name, MethodVisitor mv) {
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super(Opcodes.ASM4, mv);
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this.name = name;
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}
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@Override
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public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
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if ("Lorg/apidesign/bck2brwsr/core/JavaScriptBody;".equals(desc)) { // NOI18N
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return new FindInAnno();
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}
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return super.visitAnnotation(desc, visible);
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}
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private void generateJSBody(List<String> args, String body) {
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this.args = args;
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this.body = body;
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}
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@Override
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public void visitCode() {
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if (body == null) {
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return;
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}
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super.visitFieldInsn(
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Opcodes.GETSTATIC, FindInClass.this.name,
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"$$bck2brwsr$$" + name,
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"Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;"
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);
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super.visitInsn(Opcodes.DUP);
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Label ifNotNull = new Label();
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super.visitJumpInsn(Opcodes.IFNONNULL, ifNotNull);
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// init Fn
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super.visitInsn(Opcodes.POP);
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super.visitLdcInsn(Type.getObjectType(FindInClass.this.name));
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super.visitLdcInsn(body);
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super.visitIntInsn(Opcodes.SIPUSH, args.size());
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super.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/String");
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for (int i = 0; i < args.size(); i++) {
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String name = args.get(i);
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super.visitInsn(Opcodes.DUP);
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super.visitIntInsn(Opcodes.BIPUSH, i);
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super.visitLdcInsn(name);
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super.visitInsn(Opcodes.AASTORE);
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}
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super.visitMethodInsn(Opcodes.INVOKESTATIC,
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"org/apidesign/bck2brwsr/launcher/fximpl/Fn", "define",
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"(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/String;)Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;"
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);
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// end of Fn init
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super.visitLabel(ifNotNull);
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super.visitIntInsn(Opcodes.SIPUSH, args.size());
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super.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
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super.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
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"org/apidesign/bck2brwsr/launcher/fximpl/Fn", "invoke", "([Ljava/lang/Object;)Ljava/lang/Object;"
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);
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super.visitInsn(Opcodes.ARETURN);
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}
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@Override
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public void visitEnd() {
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super.visitEnd();
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if (body != null) {
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FindInClass.this.visitField(
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Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC,
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"$$bck2brwsr$$" + name,
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"Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;",
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null, null
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);
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}
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}
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private final class FindInAnno extends AnnotationVisitor {
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private List<String> args = new ArrayList<String>();
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private String body;
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public FindInAnno() {
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super(Opcodes.ASM4);
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}
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@Override
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public void visit(String name, Object value) {
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if (name == null) {
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args.add((String) value);
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return;
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}
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assert name.equals("body");
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body = (String) value;
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}
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@Override
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public AnnotationVisitor visitArray(String name) {
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return this;
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}
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@Override
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public void visitEnd() {
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if (body != null) {
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generateJSBody(args, body);
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}
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}
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}
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}
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}
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}
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