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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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import org.objectweb.asm.signature.SignatureReader;
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import org.objectweb.asm.signature.SignatureVisitor;
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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 ClassLoader {
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JsClassLoader(ClassLoader parent) {
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super(parent);
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}
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@Override
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protected abstract URL findResource(String name);
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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, desc,
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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 final String desc;
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private List<String> args;
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private String body;
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public FindInMethod(String name, String desc, MethodVisitor mv) {
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super(Opcodes.ASM4, mv);
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this.name = name;
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this.desc = desc;
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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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class SV extends SignatureVisitor {
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private boolean nowReturn;
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private Type returnType;
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private int index;
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public SV() {
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super(Opcodes.ASM4);
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}
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@Override
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public void visitBaseType(char descriptor) {
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final Type t = Type.getType("" + descriptor);
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if (nowReturn) {
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returnType = t;
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return;
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}
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FindInMethod.super.visitInsn(Opcodes.DUP);
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FindInMethod.super.visitIntInsn(Opcodes.SIPUSH, index);
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FindInMethod.super.visitVarInsn(t.getOpcode(Opcodes.ILOAD), index);
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String factory;
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switch (descriptor) {
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case 'I': factory = "java/lang/Integer"; break;
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case 'J': factory = "java/lang/Long"; break;
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case 'S': factory = "java/lang/Short"; break;
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case 'F': factory = "java/lang/Float"; break;
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case 'D': factory = "java/lang/Double"; break;
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case 'Z': factory = "java/lang/Boolean"; break;
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case 'C': factory = "java/lang/Character"; break;
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case 'B': factory = "java/lang/Byte"; break;
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default: throw new IllegalStateException(t.toString());
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}
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FindInMethod.super.visitMethodInsn(Opcodes.INVOKESTATIC,
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factory, "valueOf", "(" + descriptor + ")L" + factory + ";"
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);
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FindInMethod.super.visitInsn(Opcodes.AASTORE);
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index++;
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}
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@Override
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public void visitClassType(String name) {
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if (nowReturn) {
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returnType = Type.getObjectType(name);
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return;
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}
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FindInMethod.super.visitInsn(Opcodes.DUP);
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FindInMethod.super.visitIntInsn(Opcodes.SIPUSH, index);
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FindInMethod.super.visitVarInsn(Opcodes.ALOAD, index);
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FindInMethod.super.visitInsn(Opcodes.AASTORE);
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index++;
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}
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@Override
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public SignatureVisitor visitReturnType() {
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nowReturn = true;
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return this;
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}
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}
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SV sv = new SV();
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SignatureReader sr = new SignatureReader(desc);
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sr.accept(sv);
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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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switch (sv.returnType.getSort()) {
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case Type.VOID:
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super.visitInsn(Opcodes.RETURN);
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return;
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case Type.ARRAY:
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case Type.OBJECT:
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super.visitTypeInsn(Opcodes.CHECKCAST, sv.returnType.getInternalName());
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super.visitInsn(Opcodes.ARETURN);
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return;
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default:
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super.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Number");
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super.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
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"java/lang/Number", sv.returnType.getClassName() + "Value", "()" + sv.returnType.getDescriptor()
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);
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super.visitInsn(sv.returnType.getOpcode(Opcodes.IRETURN));
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}
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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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jaroslav@1170
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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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jaroslav@1170
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public AnnotationVisitor visitArray(String name) {
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jaroslav@1170
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return this;
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jaroslav@1170
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}
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jaroslav@1170
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jaroslav@1170
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@Override
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jaroslav@1170
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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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jaroslav@1170
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}
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jaroslav@1170
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}
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}
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