jaroslav@0
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/*
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jaroslav@0
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2 |
Java 4 Browser Bytecode Translator
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jaroslav@0
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3 |
Copyright (C) 2012-2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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jaroslav@0
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jaroslav@0
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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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jaroslav@0
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the Free Software Foundation, version 2 of the License.
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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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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.java4browser;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.List;
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import static org.netbeans.modules.classfile.ByteCodes.*;
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jaroslav@4
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import org.netbeans.modules.classfile.CPMethodInfo;
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import org.netbeans.modules.classfile.ClassFile;
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import org.netbeans.modules.classfile.Code;
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import org.netbeans.modules.classfile.Method;
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import org.netbeans.modules.classfile.Parameter;
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/** Translator of the code inside class files to JavaScript.
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jaroslav@0
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public final class ByteCodeToJavaScript {
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jaroslav@0
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private final ClassFile jc;
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private final Appendable out;
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jaroslav@0
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private ByteCodeToJavaScript(ClassFile jc, Appendable out) {
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this.jc = jc;
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this.out = out;
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}
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/** Converts a given class file to a JavaScript version.
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* @param fileName the name of the file we are reading
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* @param classFile input stream with code of the .class file
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* @param out a {@link StringBuilder} or similar to generate the output to
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* @throws IOException if something goes wrong during read or write or translating
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*/
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public static void compile(String fileName, InputStream classFile, Appendable out) throws IOException {
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ClassFile jc = new ClassFile(classFile, true);
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ByteCodeToJavaScript compiler = new ByteCodeToJavaScript(jc, out);
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jaroslav@0
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for (Method m : jc.getMethods()) {
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jaroslav@0
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if (m.isStatic()) {
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jaroslav@0
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compiler.generateStaticMethod(m);
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jaroslav@0
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}
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jaroslav@0
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}
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}
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private void generateStaticMethod(Method m) throws IOException {
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jaroslav@1
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out.append("\nfunction ").append(
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jc.getName().getExternalName().replace('.', '_')
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).append('_').append(
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m.getName()
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);
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out.append(m.getReturnType());
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List<Parameter> args = m.getParameters();
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for (Parameter t : args) {
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out.append(t.getDescriptor());
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}
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out.append('(');
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String space = "";
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jaroslav@2
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for (int index = 0, i = 0; i < args.size(); i++) {
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out.append(space);
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out.append("arg").append(String.valueOf(index));
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space = ",";
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final String desc = args.get(i).getDescriptor();
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jaroslav@3
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if ("D".equals(desc) || "J".equals(desc)) {
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index += 2;
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} else {
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index++;
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}
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}
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out.append(") {").append("\n");
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final Code code = m.getCode();
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int len = code.getMaxLocals();
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for (int index = args.size(), i = args.size(); i < len; i++) {
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out.append(" var ");
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out.append("arg").append(String.valueOf(i)).append(";\n");
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}
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out.append(";\n var stack = new Array(");
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out.append(Integer.toString(code.getMaxStack()));
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out.append(");\n");
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produceCode(code.getByteCodes());
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out.append("}");
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}
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private void produceCode(byte[] byteCodes) throws IOException {
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out.append("\nvar gt = 0;\nfor(;;) switch(gt) {\n");
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for (int i = 0; i < byteCodes.length; i++) {
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int prev = i;
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out.append(" case " + i).append(": ");
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final int c = (byteCodes[i] + 256) % 256;
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switch (c) {
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jaroslav@2
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case bc_aload_0:
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jaroslav@2
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case bc_iload_0:
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jaroslav@2
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case bc_lload_0:
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jaroslav@2
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case bc_fload_0:
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jaroslav@2
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case bc_dload_0:
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out.append("stack.push(arg0);");
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break;
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jaroslav@2
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case bc_aload_1:
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case bc_iload_1:
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jaroslav@2
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case bc_lload_1:
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jaroslav@2
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case bc_fload_1:
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case bc_dload_1:
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out.append("stack.push(arg1);");
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break;
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jaroslav@2
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case bc_aload_2:
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case bc_iload_2:
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jaroslav@2
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case bc_lload_2:
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jaroslav@2
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case bc_fload_2:
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jaroslav@2
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case bc_dload_2:
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jaroslav@2
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out.append("stack.push(arg2);");
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jaroslav@2
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break;
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jaroslav@3
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case bc_aload_3:
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jaroslav@3
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case bc_iload_3:
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jaroslav@3
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case bc_lload_3:
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jaroslav@3
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case bc_fload_3:
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jaroslav@3
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case bc_dload_3:
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jaroslav@3
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out.append("stack.push(arg3);");
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jaroslav@3
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break;
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jaroslav@3
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case bc_iload:
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jaroslav@3
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case bc_lload:
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jaroslav@3
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case bc_fload:
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jaroslav@3
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case bc_dload:
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jaroslav@3
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case bc_aload: {
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jaroslav@3
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final int indx = (byteCodes[++i] + 256) % 256;
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jaroslav@3
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out.append("stack.push(arg").append(indx + ");");
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jaroslav@3
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break;
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jaroslav@3
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}
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jaroslav@5
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case bc_istore_0:
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jaroslav@5
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case bc_lstore_0:
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jaroslav@5
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case bc_fstore_0:
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jaroslav@5
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case bc_dstore_0:
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jaroslav@5
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out.append("arg0 = stack.pop();");
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jaroslav@5
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break;
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jaroslav@5
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case bc_istore_1:
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jaroslav@5
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case bc_lstore_1:
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jaroslav@5
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case bc_fstore_1:
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jaroslav@5
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case bc_dstore_1:
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jaroslav@5
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out.append("arg1 = stack.pop();");
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jaroslav@5
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break;
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jaroslav@5
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case bc_istore_2:
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jaroslav@5
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case bc_lstore_2:
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jaroslav@5
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case bc_fstore_2:
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jaroslav@5
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case bc_dstore_2:
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jaroslav@5
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out.append("arg2 = stack.pop();");
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jaroslav@5
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break;
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jaroslav@5
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case bc_istore_3:
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jaroslav@5
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case bc_lstore_3:
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jaroslav@5
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case bc_fstore_3:
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jaroslav@5
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case bc_dstore_3:
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jaroslav@5
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out.append("arg3 = stack.pop();");
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jaroslav@5
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break;
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jaroslav@2
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case bc_iadd:
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jaroslav@2
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case bc_ladd:
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jaroslav@2
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case bc_fadd:
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jaroslav@2
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case bc_dadd:
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jaroslav@0
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out.append("stack.push(stack.pop() + stack.pop());");
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jaroslav@0
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break;
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jaroslav@2
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case bc_isub:
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jaroslav@2
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case bc_lsub:
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jaroslav@2
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case bc_fsub:
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jaroslav@2
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case bc_dsub:
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jaroslav@3
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out.append("{ var tmp = stack.pop(); stack.push(stack.pop() - tmp); }");
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jaroslav@2
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break;
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jaroslav@2
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case bc_imul:
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jaroslav@2
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case bc_lmul:
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jaroslav@2
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case bc_fmul:
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jaroslav@2
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case bc_dmul:
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jaroslav@1
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out.append("stack.push(stack.pop() * stack.pop());");
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jaroslav@1
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break;
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jaroslav@3
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case bc_idiv:
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jaroslav@3
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case bc_ldiv:
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jaroslav@3
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out.append("{ var tmp = stack.pop(); stack.push(Math.floor(stack.pop() / tmp)); }");
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jaroslav@3
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break;
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jaroslav@3
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case bc_fdiv:
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jaroslav@3
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case bc_ddiv:
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jaroslav@3
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188 |
out.append("{ var tmp = stack.pop(); stack.push(stack.pop() / tmp); }");
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jaroslav@3
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189 |
break;
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jaroslav@5
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190 |
case bc_iinc: {
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jaroslav@5
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191 |
final int varIndx = (byteCodes[++i] + 256) % 256;
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jaroslav@5
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192 |
final int incrBy = (byteCodes[++i] + 256) % 256;
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jaroslav@5
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193 |
if (incrBy == 1) {
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jaroslav@5
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194 |
out.append("arg" + varIndx).append("++;");
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jaroslav@5
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} else {
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jaroslav@5
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196 |
out.append("arg" + varIndx).append(" += " + incrBy).append(";");
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jaroslav@5
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197 |
}
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jaroslav@5
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break;
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jaroslav@5
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}
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jaroslav@2
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200 |
case bc_ireturn:
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jaroslav@2
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201 |
case bc_lreturn:
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jaroslav@2
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case bc_freturn:
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jaroslav@2
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203 |
case bc_dreturn:
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jaroslav@0
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204 |
out.append("return stack.pop();");
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jaroslav@1
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break;
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jaroslav@2
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206 |
case bc_i2l:
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jaroslav@2
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207 |
case bc_i2f:
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jaroslav@2
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208 |
case bc_i2d:
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jaroslav@2
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209 |
case bc_l2i:
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jaroslav@3
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210 |
// max int check?
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jaroslav@2
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211 |
case bc_l2f:
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jaroslav@2
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212 |
case bc_l2d:
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jaroslav@3
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213 |
case bc_f2d:
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jaroslav@3
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214 |
case bc_d2f:
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jaroslav@3
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215 |
out.append("/* number conversion */");
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jaroslav@3
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216 |
break;
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jaroslav@2
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217 |
case bc_f2i:
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jaroslav@2
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218 |
case bc_f2l:
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jaroslav@2
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219 |
case bc_d2i:
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jaroslav@2
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220 |
case bc_d2l:
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jaroslav@3
|
221 |
out.append("stack.push(Math.floor(stack.pop()));");
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jaroslav@3
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222 |
break;
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jaroslav@2
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223 |
case bc_i2b:
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jaroslav@2
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224 |
case bc_i2c:
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jaroslav@2
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225 |
case bc_i2s:
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jaroslav@2
|
226 |
out.append("/* number conversion */");
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jaroslav@2
|
227 |
break;
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jaroslav@4
|
228 |
case bc_iconst_0:
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jaroslav@4
|
229 |
case bc_dconst_0:
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jaroslav@4
|
230 |
case bc_lconst_0:
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jaroslav@4
|
231 |
case bc_fconst_0:
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jaroslav@4
|
232 |
out.append("stack.push(0);");
|
jaroslav@4
|
233 |
break;
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jaroslav@4
|
234 |
case bc_iconst_1:
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jaroslav@4
|
235 |
case bc_lconst_1:
|
jaroslav@4
|
236 |
case bc_fconst_1:
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jaroslav@4
|
237 |
case bc_dconst_1:
|
jaroslav@4
|
238 |
out.append("stack.push(1);");
|
jaroslav@4
|
239 |
break;
|
jaroslav@4
|
240 |
case bc_iconst_2:
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jaroslav@4
|
241 |
case bc_fconst_2:
|
jaroslav@4
|
242 |
out.append("stack.push(2);");
|
jaroslav@4
|
243 |
break;
|
jaroslav@4
|
244 |
case bc_iconst_3:
|
jaroslav@4
|
245 |
out.append("stack.push(3);");
|
jaroslav@4
|
246 |
break;
|
jaroslav@4
|
247 |
case bc_iconst_4:
|
jaroslav@4
|
248 |
out.append("stack.push(4);");
|
jaroslav@4
|
249 |
break;
|
jaroslav@4
|
250 |
case bc_iconst_5:
|
jaroslav@4
|
251 |
out.append("stack.push(5);");
|
jaroslav@4
|
252 |
break;
|
jaroslav@4
|
253 |
case bc_if_icmpeq: {
|
jaroslav@4
|
254 |
i = generateIf(byteCodes, i, "==");
|
jaroslav@4
|
255 |
break;
|
jaroslav@4
|
256 |
}
|
jaroslav@4
|
257 |
case bc_if_icmpne:
|
jaroslav@4
|
258 |
i = generateIf(byteCodes, i, "!=");
|
jaroslav@4
|
259 |
break;
|
jaroslav@4
|
260 |
case bc_if_icmplt:
|
jaroslav@4
|
261 |
i = generateIf(byteCodes, i, ">");
|
jaroslav@4
|
262 |
break;
|
jaroslav@4
|
263 |
case bc_if_icmple:
|
jaroslav@4
|
264 |
i = generateIf(byteCodes, i, ">=");
|
jaroslav@4
|
265 |
break;
|
jaroslav@4
|
266 |
case bc_if_icmpgt:
|
jaroslav@4
|
267 |
i = generateIf(byteCodes, i, "<");
|
jaroslav@4
|
268 |
break;
|
jaroslav@4
|
269 |
case bc_if_icmpge:
|
jaroslav@4
|
270 |
i = generateIf(byteCodes, i, "<=");
|
jaroslav@4
|
271 |
break;
|
jaroslav@5
|
272 |
case bc_goto: {
|
jaroslav@5
|
273 |
int indx = i + readIntArg(byteCodes, i);
|
jaroslav@5
|
274 |
out.append("gt = " + indx).append("; continue;");
|
jaroslav@5
|
275 |
i += 2;
|
jaroslav@5
|
276 |
break;
|
jaroslav@5
|
277 |
}
|
jaroslav@4
|
278 |
case bc_invokestatic: {
|
jaroslav@4
|
279 |
int methodIndex = readIntArg(byteCodes, i);
|
jaroslav@4
|
280 |
CPMethodInfo mi = (CPMethodInfo) jc.getConstantPool().get(methodIndex);
|
jaroslav@4
|
281 |
boolean[] hasReturn = { false };
|
jaroslav@4
|
282 |
StringBuilder signature = new StringBuilder();
|
jaroslav@4
|
283 |
int cnt = countArgs(mi.getDescriptor(), hasReturn, signature);
|
jaroslav@4
|
284 |
|
jaroslav@4
|
285 |
if (hasReturn[0]) {
|
jaroslav@4
|
286 |
out.append("stack.push(");
|
jaroslav@4
|
287 |
}
|
jaroslav@4
|
288 |
out.append(mi.getClassName().getInternalName().replace('/', '_'));
|
jaroslav@4
|
289 |
out.append('_');
|
jaroslav@4
|
290 |
out.append(mi.getName());
|
jaroslav@4
|
291 |
out.append(signature.toString());
|
jaroslav@4
|
292 |
out.append('(');
|
jaroslav@4
|
293 |
String sep = "";
|
jaroslav@4
|
294 |
for (int j = 0; j < cnt; j++) {
|
jaroslav@4
|
295 |
out.append(sep);
|
jaroslav@4
|
296 |
out.append("stack.pop()");
|
jaroslav@4
|
297 |
sep = ", ";
|
jaroslav@4
|
298 |
}
|
jaroslav@4
|
299 |
out.append(")");
|
jaroslav@4
|
300 |
if (hasReturn[0]) {
|
jaroslav@4
|
301 |
out.append(")");
|
jaroslav@4
|
302 |
}
|
jaroslav@4
|
303 |
out.append(";");
|
jaroslav@4
|
304 |
i += 2;
|
jaroslav@4
|
305 |
break;
|
jaroslav@4
|
306 |
}
|
jaroslav@0
|
307 |
}
|
jaroslav@3
|
308 |
out.append(" /*");
|
jaroslav@0
|
309 |
for (int j = prev; j <= i; j++) {
|
jaroslav@0
|
310 |
out.append(" ");
|
jaroslav@0
|
311 |
final int cc = (byteCodes[j] + 256) % 256;
|
jaroslav@0
|
312 |
out.append(Integer.toString(cc));
|
jaroslav@0
|
313 |
}
|
jaroslav@0
|
314 |
out.append("*/\n");
|
jaroslav@0
|
315 |
}
|
jaroslav@4
|
316 |
out.append("}\n");
|
jaroslav@4
|
317 |
}
|
jaroslav@4
|
318 |
|
jaroslav@4
|
319 |
private int generateIf(byte[] byteCodes, int i, final String test) throws IOException {
|
jaroslav@4
|
320 |
int indx = i + readIntArg(byteCodes, i);
|
jaroslav@4
|
321 |
out.append("if (stack.pop() ").append(test).append(" stack.pop()) { gt = " + indx);
|
jaroslav@4
|
322 |
out.append("; continue; }");
|
jaroslav@4
|
323 |
return i + 2;
|
jaroslav@4
|
324 |
}
|
jaroslav@4
|
325 |
|
jaroslav@4
|
326 |
private int readIntArg(byte[] byteCodes, int offsetInstruction) {
|
jaroslav@5
|
327 |
final int indxHi = byteCodes[offsetInstruction + 1] << 8;
|
jaroslav@5
|
328 |
final int indxLo = byteCodes[offsetInstruction + 2];
|
jaroslav@5
|
329 |
return (indxHi & 0xffffff00) | (indxLo & 0xff);
|
jaroslav@4
|
330 |
}
|
jaroslav@4
|
331 |
|
jaroslav@4
|
332 |
private static int countArgs(String descriptor, boolean[] hasReturnType, StringBuilder sig) {
|
jaroslav@4
|
333 |
int cnt = 0;
|
jaroslav@4
|
334 |
int i = 0;
|
jaroslav@4
|
335 |
Boolean count = null;
|
jaroslav@4
|
336 |
while (i < descriptor.length()) {
|
jaroslav@4
|
337 |
char ch = descriptor.charAt(i++);
|
jaroslav@4
|
338 |
switch (ch) {
|
jaroslav@4
|
339 |
case '(':
|
jaroslav@4
|
340 |
count = true;
|
jaroslav@4
|
341 |
continue;
|
jaroslav@4
|
342 |
case ')':
|
jaroslav@4
|
343 |
count = false;
|
jaroslav@4
|
344 |
continue;
|
jaroslav@4
|
345 |
case 'B':
|
jaroslav@4
|
346 |
case 'C':
|
jaroslav@4
|
347 |
case 'D':
|
jaroslav@4
|
348 |
case 'F':
|
jaroslav@4
|
349 |
case 'I':
|
jaroslav@4
|
350 |
case 'J':
|
jaroslav@4
|
351 |
case 'S':
|
jaroslav@4
|
352 |
case 'Z':
|
jaroslav@4
|
353 |
if (count) {
|
jaroslav@4
|
354 |
cnt++;
|
jaroslav@4
|
355 |
sig.append(ch);
|
jaroslav@4
|
356 |
} else {
|
jaroslav@4
|
357 |
hasReturnType[0] = true;
|
jaroslav@4
|
358 |
sig.insert(0, ch);
|
jaroslav@4
|
359 |
}
|
jaroslav@4
|
360 |
continue;
|
jaroslav@4
|
361 |
case 'V':
|
jaroslav@4
|
362 |
assert !count;
|
jaroslav@4
|
363 |
hasReturnType[0] = false;
|
jaroslav@4
|
364 |
sig.insert(0, 'V');
|
jaroslav@4
|
365 |
continue;
|
jaroslav@4
|
366 |
case 'L':
|
jaroslav@4
|
367 |
i = descriptor.indexOf(';', i);
|
jaroslav@4
|
368 |
if (count) {
|
jaroslav@4
|
369 |
cnt++;
|
jaroslav@4
|
370 |
} else {
|
jaroslav@4
|
371 |
hasReturnType[0] = true;
|
jaroslav@4
|
372 |
}
|
jaroslav@4
|
373 |
continue;
|
jaroslav@4
|
374 |
case '[':
|
jaroslav@4
|
375 |
//arrays++;
|
jaroslav@4
|
376 |
continue;
|
jaroslav@4
|
377 |
default:
|
jaroslav@4
|
378 |
break; // invalid character
|
jaroslav@4
|
379 |
}
|
jaroslav@4
|
380 |
}
|
jaroslav@4
|
381 |
return cnt;
|
jaroslav@0
|
382 |
}
|
jaroslav@0
|
383 |
}
|