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.IOException;
21 import java.io.InputStream;
22 import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
24 /** Generator of JavaScript from bytecode of classes on classpath of the VM.
26 * @author Jaroslav Tulach <jtulach@netbeans.org>
28 abstract class VM extends ByteCodeToJavaScript {
29 protected final Bck2Brwsr.Resources resources;
30 private final ExportedSymbols exportedSymbols;
32 private VM(Appendable out, Bck2Brwsr.Resources resources) {
34 this.resources = resources;
35 this.exportedSymbols = new ExportedSymbols(resources);
39 // uses VMLazy to load dynamic classes
40 boolean assertsOn = false;
41 assert assertsOn = true;
49 boolean debug(String msg) throws IOException {
53 static void compileStandalone(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
54 VM vm = new Standalone(out, l);
58 static void compileExtension(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
59 VM vm = new Extension(out, l);
63 private void doCompile(StringArray names) throws IOException {
69 protected abstract void generatePrologue() throws IOException;
71 protected abstract void generateEpilogue() throws IOException;
73 protected abstract String generateClass(String className)
76 protected abstract String getExportsObject();
79 protected final void declaredClass(ClassData classData, String mangledName)
81 if (exportedSymbols.isExported(classData)) {
82 out.append("\n").append(getExportsObject()).append("['")
85 .append(accessClass(mangledName))
90 private void generateBody(StringArray names) throws IOException {
91 StringArray processed = new StringArray();
92 StringArray initCode = new StringArray();
93 for (String baseClass : names.toArray()) {
94 references.add(baseClass);
97 for (String n : references.toArray()) {
98 if (processed.contains(n)) {
108 String ic = generateClass(name);
110 initCode.add(ic == null ? "" : ic);
111 } catch (RuntimeException ex) {
112 if (out instanceof CharSequence) {
113 CharSequence seq = (CharSequence)out;
114 int lastBlock = seq.length();
115 while (lastBlock-- > 0) {
116 if (seq.charAt(lastBlock) == '{') {
120 throw new IOException("Error while compiling " + name + "\n"
121 + seq.subSequence(lastBlock + 1, seq.length()), ex
124 throw new IOException("Error while compiling " + name + "\n"
131 for (String resource : scripts.toArray()) {
132 while (resource.startsWith("/")) {
133 resource = resource.substring(1);
135 InputStream emul = resources.get(resource);
137 throw new IOException("Can't find " + resource);
139 readResource(emul, out);
141 scripts = new StringArray();
143 StringArray toInit = StringArray.asList(references.toArray());
146 for (String ic : toInit.toArray()) {
147 int indx = processed.indexOf(ic);
149 final String theCode = initCode.toArray()[indx];
150 if (!theCode.isEmpty()) {
151 out.append(theCode).append("\n");
153 initCode.toArray()[indx] = "";
159 private static void readResource(InputStream emul, Appendable out) throws IOException {
163 int ch = emul.read();
167 if (ch < 0 || ch > 255) {
168 throw new IOException("Invalid char in emulation " + ch);
175 out.append((char)ch);
182 out.append('/').append((char)ch);
205 private static InputStream loadClass(Bck2Brwsr.Resources l, String name) throws IOException {
206 return l.get(name + ".class"); // NOI18N
209 static String toString(String name) throws IOException {
210 StringBuilder sb = new StringBuilder();
211 // compile(sb, name);
212 return sb.toString().toString();
215 private StringArray scripts = new StringArray();
216 private StringArray references = new StringArray();
219 protected boolean requireReference(String cn) {
220 if (references.contains(cn)) {
228 protected void requireScript(String resourcePath) {
229 scripts.add(resourcePath);
233 String assignClass(String className) {
234 return "vm." + className + " = ";
238 String accessClass(String className) {
239 return "vm." + className;
242 private static final class Standalone extends VM {
243 private Standalone(Appendable out, Bck2Brwsr.Resources resources) {
244 super(out, resources);
248 protected void generatePrologue() throws IOException {
249 out.append("(function VM(global) {var fillInVMSkeleton = function(vm) {");
253 protected void generateEpilogue() throws IOException {
257 + " var extensions = [];\n"
258 + " global.bck2brwsr = function() {\n"
259 + " var args = Array.prototype.slice.apply(arguments);\n"
260 + " var vm = fillInVMSkeleton({});\n"
261 + " for (var i = 0; i < extensions.length; ++i) {\n"
262 + " extensions[i](vm);\n"
264 + " var loader = {};\n"
265 + " loader.vm = vm;\n"
266 + " loader.loadClass = function(name) {\n"
267 + " var attr = name.replace__Ljava_lang_String_2CC('.','_');\n"
268 + " var fn = vm[attr];\n"
269 + " if (fn) return fn(false);\n"
270 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
271 + " load__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
273 + " if (vm.loadClass) {\n"
274 + " throw 'Cannot initialize the bck2brwsr VM twice!';\n"
276 + " vm.loadClass = loader.loadClass;\n"
277 + " vm.loadBytes = function(name) {\n"
278 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
279 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
281 + " vm.java_lang_reflect_Array(false);\n"
282 + " vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
283 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, null, args);\n"
284 + " return loader;\n"
287 " global.bck2brwsr.registerExtension"
288 + " = function(extension) {\n"
289 + " extensions.push(extension);\n"
291 out.append("}(this));");
295 protected String generateClass(String className) throws IOException {
296 InputStream is = loadClass(resources, className);
298 throw new IOException("Can't find class " + className);
304 protected String getExportsObject() {
309 private static final class Extension extends VM {
310 private Extension(Appendable out, Bck2Brwsr.Resources resources) {
311 super(out, resources);
315 protected void generatePrologue() throws IOException {
316 out.append("bck2brwsr.registerExtension(function(exports) {\n"
317 + " var vm = {};\n");
318 out.append(" function link(n, inst) {\n"
319 + " var cls = n.replace__Ljava_lang_String_2CC("
320 + "'/', '_').toString();\n"
321 + " var dot = n.replace__Ljava_lang_String_2CC("
322 + "'/', '.').toString();\n"
323 + " exports.loadClass(dot);\n"
324 + " vm[cls] = exports[cls];\n"
325 + " return vm[cls](inst);\n"
330 protected void generateEpilogue() throws IOException {
335 protected String generateClass(String className) throws IOException {
336 InputStream is = loadClass(resources, className);
338 out.append("\n").append(assignClass(
339 className.replace('/', '_')))
340 .append("function() {\n return link('")
342 .append("', arguments.length == 0 || arguments[0] === true);"
352 protected String getExportsObject() {