2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.vm4brwsr;
20 import java.io.ByteArrayInputStream;
21 import java.io.IOException;
22 import java.io.InputStream;
23 import java.lang.reflect.Array;
24 import org.apidesign.bck2brwsr.core.JavaScriptBody;
28 * @author Jaroslav Tulach <jtulach@netbeans.org>
31 private final Object loader;
32 private final Object[] args;
34 private VMLazy(Object loader, Object[] args) {
42 static Object load(Object loader, String name, Object[] arguments)
43 throws IOException, ClassNotFoundException {
44 return new VMLazy(loader, arguments).load(name, false);
47 static byte[] loadBytes(Object loader, String name, Object[] arguments) throws Exception {
48 return Zips.loadFromCp(arguments, name);
51 private Object load(String name, boolean instance)
52 throws IOException, ClassNotFoundException {
53 String res = name.replace('.', '/') + ".class";
54 byte[] arr = Zips.loadFromCp(args, res);
56 throw new ClassNotFoundException(name);
58 // beingDefined(loader, name);
59 StringBuilder out = new StringBuilder();
60 out.append("var loader = arguments[0];\n");
61 out.append("var vm = loader.vm;\n");
62 int prelude = out.length();
63 String initCode = new Gen(this, out).compile(new ByteArrayInputStream(arr));
64 String code = out.toString().toString();
65 // dump("Loading " + name);
67 String under = name.replace('.', '_');
68 Object fn = applyCode(loader, under, code, instance);
70 if (!initCode.isEmpty()) {
71 out.setLength(prelude);
73 code = out.toString().toString();
75 applyCode(loader, null, code, false);
81 // @JavaScriptBody(args = "s", body = "java.lang.System.out.println(s.toString());")
82 static void dump(String s) {
85 /* possibly not needed:
86 @JavaScriptBody(args = {"loader", "n" }, body =
87 "var cls = n.replace__Ljava_lang_String_2CC(n, '.','_').toString();" +
88 "loader.vm[cls] = true;\n"
90 private static native void beingDefined(Object loader, String name);
94 @JavaScriptBody(args = {"loader", "name", "script", "instance" }, body =
96 " new Function(script)(loader, name);\n" +
98 " throw 'Cannot compile ' + name + ' ' + ex + ' line: ' + ex.lineNumber + ' script:\\n' + script;\n" +
100 "return name != null ? vm[name](instance) : null;\n"
102 private static native Object applyCode(Object loader, String name, String script, boolean instance);
105 private static final class Gen extends ByteCodeToJavaScript {
106 private final VMLazy lazy;
108 public Gen(VMLazy vm, Appendable out) {
113 @JavaScriptBody(args = {"n"},
115 "var cls = n.replace__Ljava_lang_String_2CC('/','_').toString();"
116 + "\nvar dot = n.replace__Ljava_lang_String_2CC('/','.').toString();"
117 + "\nvar lazy = this._lazy();"
118 + "\nvar loader = lazy._loader();"
119 + "\nvar vm = loader.vm;"
120 + "\nif (vm[cls]) return false;"
121 + "\nvm[cls] = function() {"
122 + "\n var instance = arguments.length == 0 || arguments[0] === true;"
123 + "\n return lazy.load__Ljava_lang_Object_2Ljava_lang_String_2Z(dot, instance);"
127 protected boolean requireReference(String internalClassName) {
128 throw new UnsupportedOperationException();
132 protected void requireScript(String resourcePath) throws IOException {
133 InputStream is = getClass().getResourceAsStream(resourcePath);
134 StringBuilder sb = new StringBuilder();
142 applyCode(lazy.loader, null, sb.toString(), false);
146 String assignClass(String className) {
147 return "vm[arguments[1]]=";
151 String accessClass(String classOperation) {
152 return "vm." + classOperation;