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;
23 import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
24 import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
26 /** Generator of JavaScript from bytecode of classes on classpath of the VM.
28 * @author Jaroslav Tulach <jtulach@netbeans.org>
30 abstract class VM extends ByteCodeToJavaScript {
31 protected final Bck2Brwsr.Resources resources;
32 private final ExportedSymbols exportedSymbols;
34 private VM(Appendable out, Bck2Brwsr.Resources resources) {
36 this.resources = resources;
37 this.exportedSymbols = new ExportedSymbols(resources);
41 // uses VMLazy to load dynamic classes
42 boolean assertsOn = false;
43 assert assertsOn = true;
51 boolean debug(String msg) throws IOException {
55 static void compileStandalone(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
56 VM vm = new Standalone(out, l);
60 static void compileExtension(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
61 VM vm = new Extension(out, l);
65 private void doCompile(StringArray names) throws IOException {
71 protected abstract void generatePrologue() throws IOException;
73 protected abstract void generateEpilogue() throws IOException;
75 protected abstract String generateClass(String className)
78 protected abstract String getExportsObject();
81 protected final void declaredClass(ClassData classData, String mangledName)
83 if (exportedSymbols.isExported(classData)) {
84 out.append("\n").append(getExportsObject()).append("['")
87 .append(accessClass(mangledName))
93 protected void declaredField(FieldData fieldData,
95 String mangledName) throws IOException {
96 if (exportedSymbols.isExported(fieldData)) {
97 exportMember(destObject, mangledName);
102 protected void declaredMethod(MethodData methodData,
104 String mangledName) throws IOException {
105 if (exportedSymbols.isExported(methodData)) {
106 exportMember(destObject, mangledName);
110 private void exportMember(String destObject, String memberName)
112 out.append("\n").append(destObject).append("['")
115 .append(destObject).append(".").append(memberName)
119 private void generateBody(StringArray names) throws IOException {
120 StringArray processed = new StringArray();
121 StringArray initCode = new StringArray();
122 for (String baseClass : names.toArray()) {
123 references.add(baseClass);
126 for (String n : references.toArray()) {
127 if (processed.contains(n)) {
137 String ic = generateClass(name);
139 initCode.add(ic == null ? "" : ic);
140 } catch (RuntimeException ex) {
141 if (out instanceof CharSequence) {
142 CharSequence seq = (CharSequence)out;
143 int lastBlock = seq.length();
144 while (lastBlock-- > 0) {
145 if (seq.charAt(lastBlock) == '{') {
149 throw new IOException("Error while compiling " + name + "\n"
150 + seq.subSequence(lastBlock + 1, seq.length()), ex
153 throw new IOException("Error while compiling " + name + "\n"
160 for (String resource : scripts.toArray()) {
161 while (resource.startsWith("/")) {
162 resource = resource.substring(1);
164 InputStream emul = resources.get(resource);
166 throw new IOException("Can't find " + resource);
168 readResource(emul, out);
170 scripts = new StringArray();
172 StringArray toInit = StringArray.asList(references.toArray());
175 for (String ic : toInit.toArray()) {
176 int indx = processed.indexOf(ic);
178 final String theCode = initCode.toArray()[indx];
179 if (!theCode.isEmpty()) {
180 out.append(theCode).append("\n");
182 initCode.toArray()[indx] = "";
188 private static void readResource(InputStream emul, Appendable out) throws IOException {
192 int ch = emul.read();
196 if (ch < 0 || ch > 255) {
197 throw new IOException("Invalid char in emulation " + ch);
204 out.append((char)ch);
211 out.append('/').append((char)ch);
234 private static InputStream loadClass(Bck2Brwsr.Resources l, String name) throws IOException {
235 return l.get(name + ".class"); // NOI18N
238 static String toString(String name) throws IOException {
239 StringBuilder sb = new StringBuilder();
240 // compile(sb, name);
241 return sb.toString().toString();
244 private StringArray scripts = new StringArray();
245 private StringArray references = new StringArray();
248 protected boolean requireReference(String cn) {
249 if (references.contains(cn)) {
257 protected void requireScript(String resourcePath) {
258 scripts.add(resourcePath);
262 String assignClass(String className) {
263 return "vm." + className + " = ";
267 String accessClass(String className) {
268 return "vm." + className;
271 private static final class Standalone extends VM {
272 private Standalone(Appendable out, Bck2Brwsr.Resources resources) {
273 super(out, resources);
277 protected void generatePrologue() throws IOException {
278 out.append("(function VM(global) {var fillInVMSkeleton = function(vm) {");
282 protected void generateEpilogue() throws IOException {
286 + " var extensions = [];\n"
287 + " global.bck2brwsr = function() {\n"
288 + " var args = Array.prototype.slice.apply(arguments);\n"
289 + " var vm = fillInVMSkeleton({});\n"
290 + " for (var i = 0; i < extensions.length; ++i) {\n"
291 + " extensions[i](vm);\n"
293 + " var loader = {};\n"
294 + " loader.vm = vm;\n"
295 + " loader.loadClass = function(name) {\n"
296 + " var attr = name.replace__Ljava_lang_String_2CC('.','_');\n"
297 + " var fn = vm[attr];\n"
298 + " if (fn) return fn(false);\n"
299 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
300 + " load__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
302 + " if (vm.loadClass) {\n"
303 + " throw 'Cannot initialize the bck2brwsr VM twice!';\n"
305 + " vm.loadClass = loader.loadClass;\n"
306 + " vm.loadBytes = function(name) {\n"
307 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
308 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
310 + " vm.java_lang_reflect_Array(false);\n"
311 + " vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
312 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, null, args);\n"
313 + " return loader;\n"
316 " global.bck2brwsr.registerExtension"
317 + " = function(extension) {\n"
318 + " extensions.push(extension);\n"
320 out.append("}(this));");
324 protected String generateClass(String className) throws IOException {
325 InputStream is = loadClass(resources, className);
327 throw new IOException("Can't find class " + className);
333 protected String getExportsObject() {
338 private static final class Extension extends VM {
339 private Extension(Appendable out, Bck2Brwsr.Resources resources) {
340 super(out, resources);
344 protected void generatePrologue() throws IOException {
345 out.append("bck2brwsr.registerExtension(function(exports) {\n"
346 + " var vm = {};\n");
347 out.append(" function link(n, inst) {\n"
348 + " var cls = n.replace__Ljava_lang_String_2CC("
349 + "'/', '_').toString();\n"
350 + " var dot = n.replace__Ljava_lang_String_2CC("
351 + "'/', '.').toString();\n"
352 + " exports.loadClass(dot);\n"
353 + " vm[cls] = exports[cls];\n"
354 + " return vm[cls](inst);\n"
359 protected void generateEpilogue() throws IOException {
364 protected String generateClass(String className) throws IOException {
365 InputStream is = loadClass(resources, className);
367 out.append("\n").append(assignClass(
368 className.replace('/', '_')))
369 .append("function() {\n return link('")
371 .append("', arguments.length == 0 || arguments[0] === true);"
381 protected String getExportsObject() {