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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.vm4brwsr;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apidesign.bck2brwsr.core.Exported;
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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/**
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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final class VMLazy {
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private final Object vm;
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private final Object[] args;
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private VMLazy(Object vm, Object[] args) {
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this.vm = vm;
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this.args = args;
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}
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static void init() {
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}
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@Exported
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static Object load(Object loader, String name, Object[] arguments, byte[] arr)
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throws IOException, ClassNotFoundException {
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if (arr == null) {
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throw new ClassNotFoundException(name);
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}
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return new VMLazy(loader, arguments).defineClass(arr, name, false);
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}
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@Exported
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Object load(String name, boolean instance)
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throws IOException, ClassNotFoundException {
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String res = name.replace('.', '/') + ".class";
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byte[] arr = ClassPath.loadBytes(res, args, 0);
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if (arr == null) {
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throw new ClassNotFoundException(name);
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}
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return defineClass(arr, name, instance);
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}
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private Object defineClass(byte[] arr, String name, boolean instance) throws IOException {
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StringBuilder out = new StringBuilder(65535);
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out.append("var vm = arguments[0];\n");
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int prelude = out.length();
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String initCode = new Gen(this, out).compile(new ByteArrayInputStream(arr));
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String code = out.toString().toString();
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String under = name.replace('.', '_');
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Object fn = applyCode(vm, under, code, instance);
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if (!initCode.isEmpty()) {
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out.setLength(prelude);
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out.append(initCode);
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code = out.toString().toString();
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applyCode(vm, null, code, false);
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}
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return fn;
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}
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@JavaScriptBody(args = {"vm", "name", "script", "instance" }, body =
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"try {\n" +
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" new Function(script)(vm, name);\n" +
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"} catch (ex) {\n" +
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" throw 'Cannot compile ' + name + ' ' + ex + ' line: ' + ex.lineNumber + ' script:\\n' + script;\n" +
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"}\n" +
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"return name != null ? vm[name](instance) : null;\n"
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)
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private static native Object applyCode(Object vm, String name, String script, boolean instance);
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private static final class Gen extends ByteCodeToJavaScript {
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private final VMLazy lazy;
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public Gen(VMLazy vm, Appendable out) {
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super(out);
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this.lazy = vm;
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}
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@JavaScriptBody(args = {"n"},
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body =
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"var cls = n.replace__Ljava_lang_String_2CC('/','_').toString();"
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+ "\nvar dot = n.replace__Ljava_lang_String_2CC('/','.').toString();"
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+ "\nvar lazy = this._lazy();"
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+ "\nvar vm = lazy._vm();"
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+ "\nif (vm[cls]) return false;"
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+ "\nvm[cls] = function() {"
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+ "\n var instance = arguments.length == 0 || arguments[0] === true;"
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+ "\n return lazy.load__Ljava_lang_Object_2Ljava_lang_String_2Z(dot, instance);"
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+ "\n};"
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+ "\nreturn true;")
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@Override
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protected boolean requireReference(String internalClassName) {
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throw new UnsupportedOperationException();
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}
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@Override
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protected void requireScript(String resourcePath) throws IOException {
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if (!resourcePath.startsWith("/")) {
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resourcePath = "/" + resourcePath;
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}
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String code = readCode(resourcePath);
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applyCode(lazy.vm, null, code, false);
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}
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private String readCode(String resourcePath) throws IOException {
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InputStream is = getClass().getResourceAsStream(resourcePath);
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StringBuilder sb = new StringBuilder();
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for (;;) {
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int ch = is.read();
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if (ch == -1) {
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break;
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}
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sb.append((char)ch);
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}
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return sb.toString();
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}
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@Override
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String assignClass(String className) {
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return "vm[arguments[1]]=";
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}
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@Override
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String accessClass(String classOperation) {
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return "vm." + classOperation;
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}
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}
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}
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