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 ClassDataCache classDataCache;
33 private final Bck2Brwsr.Resources resources;
34 private final ExportedSymbols exportedSymbols;
36 private VM(Appendable out, Bck2Brwsr.Resources resources) {
38 this.resources = resources;
39 this.classDataCache = new ClassDataCache(resources);
40 this.exportedSymbols = new ExportedSymbols(resources);
44 // uses VMLazy to load dynamic classes
45 boolean assertsOn = false;
46 assert assertsOn = true;
54 boolean debug(String msg) throws IOException {
58 static void compileStandalone(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
59 VM vm = new Standalone(out, l);
63 static void compileExtension(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
64 VM vm = new Extension(out, l);
68 private void doCompile(StringArray names) throws IOException {
74 protected abstract void generatePrologue() throws IOException;
76 protected abstract void generateEpilogue() throws IOException;
78 protected abstract String generateClass(String className)
81 protected abstract String getExportsObject();
84 protected final void declaredClass(ClassData classData, String mangledName)
86 if (exportedSymbols.isExported(classData)) {
87 out.append("\n").append(getExportsObject()).append("['")
90 .append(accessClass(mangledName))
96 protected void declaredField(FieldData fieldData,
98 String mangledName) throws IOException {
99 if (exportedSymbols.isExported(fieldData)) {
100 exportMember(destObject, mangledName);
105 protected void declaredMethod(MethodData methodData,
107 String mangledName) throws IOException {
108 if (exportedSymbols.isExported(methodData)) {
109 exportMember(destObject, mangledName);
113 private void exportMember(String destObject, String memberName)
115 out.append("\n").append(destObject).append("['")
118 .append(destObject).append(".").append(memberName)
122 private void generateBody(StringArray names) throws IOException {
123 StringArray processed = new StringArray();
124 StringArray initCode = new StringArray();
125 for (String baseClass : names.toArray()) {
126 references.add(baseClass);
129 for (String n : references.toArray()) {
130 if (processed.contains(n)) {
140 String ic = generateClass(name);
142 initCode.add(ic == null ? "" : ic);
143 } catch (RuntimeException ex) {
144 if (out instanceof CharSequence) {
145 CharSequence seq = (CharSequence)out;
146 int lastBlock = seq.length();
147 while (lastBlock-- > 0) {
148 if (seq.charAt(lastBlock) == '{') {
152 throw new IOException("Error while compiling " + name + "\n"
153 + seq.subSequence(lastBlock + 1, seq.length()), ex
156 throw new IOException("Error while compiling " + name + "\n"
163 for (String resource : scripts.toArray()) {
164 while (resource.startsWith("/")) {
165 resource = resource.substring(1);
167 InputStream emul = resources.get(resource);
169 throw new IOException("Can't find " + resource);
171 readResource(emul, out);
173 scripts = new StringArray();
175 StringArray toInit = StringArray.asList(references.toArray());
178 for (String ic : toInit.toArray()) {
179 int indx = processed.indexOf(ic);
181 final String theCode = initCode.toArray()[indx];
182 if (!theCode.isEmpty()) {
183 out.append(theCode).append("\n");
185 initCode.toArray()[indx] = "";
191 private static void readResource(InputStream emul, Appendable out) throws IOException {
195 int ch = emul.read();
199 if (ch < 0 || ch > 255) {
200 throw new IOException("Invalid char in emulation " + ch);
207 out.append((char)ch);
214 out.append('/').append((char)ch);
237 static String toString(String name) throws IOException {
238 StringBuilder sb = new StringBuilder();
239 // compile(sb, name);
240 return sb.toString().toString();
243 private StringArray scripts = new StringArray();
244 private StringArray references = new StringArray();
247 protected boolean requireReference(String cn) {
248 if (references.contains(cn)) {
256 protected void requireScript(String resourcePath) {
257 scripts.add(resourcePath);
261 String assignClass(String className) {
262 return "vm." + className + " = ";
266 String accessClass(String className) {
267 return "vm." + className;
271 protected String accessMember(String object, String mangledName,
272 String[] fieldInfoName) throws IOException {
273 final ClassData declaringClass =
274 classDataCache.getClassData(fieldInfoName[0]);
275 if (declaringClass == null) {
276 return object + "['" + mangledName + "']";
280 return object + "." + mangledName;
283 private static final class Standalone extends VM {
284 private Standalone(Appendable out, Bck2Brwsr.Resources resources) {
285 super(out, resources);
289 protected void generatePrologue() throws IOException {
290 out.append("(function VM(global) {var fillInVMSkeleton = function(vm) {");
294 protected void generateEpilogue() throws IOException {
298 + " var extensions = [];\n"
299 + " global.bck2brwsr = function() {\n"
300 + " var args = Array.prototype.slice.apply(arguments);\n"
301 + " var vm = fillInVMSkeleton({});\n"
302 + " for (var i = 0; i < extensions.length; ++i) {\n"
303 + " extensions[i](vm);\n"
305 + " var loader = {};\n"
306 + " loader.vm = vm;\n"
307 + " loader.loadClass = function(name) {\n"
308 + " var attr = name.replace__Ljava_lang_String_2CC('.','_');\n"
309 + " var fn = vm[attr];\n"
310 + " if (fn) return fn(false);\n"
311 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
312 + " load__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
314 + " if (vm.loadClass) {\n"
315 + " throw 'Cannot initialize the bck2brwsr VM twice!';\n"
317 + " vm.loadClass = loader.loadClass;\n"
318 + " vm.loadBytes = function(name) {\n"
319 + " return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
320 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, name, args);\n"
322 + " vm.java_lang_reflect_Array(false);\n"
323 + " vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
324 + " loadBytes___3BLjava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2(loader, null, args);\n"
325 + " return loader;\n"
328 " global.bck2brwsr.registerExtension"
329 + " = function(extension) {\n"
330 + " extensions.push(extension);\n"
332 out.append("}(this));");
336 protected String generateClass(String className) throws IOException {
337 ClassData classData = classDataCache.getClassData(className);
338 if (classData == null) {
339 throw new IOException("Can't find class " + className);
341 return compile(classData);
345 protected String getExportsObject() {
350 private static final class Extension extends VM {
351 private Extension(Appendable out, Bck2Brwsr.Resources resources) {
352 super(out, resources);
356 protected void generatePrologue() throws IOException {
357 out.append("bck2brwsr.registerExtension(function(exports) {\n"
358 + " var vm = {};\n");
359 out.append(" function link(n, inst) {\n"
360 + " var cls = n.replace__Ljava_lang_String_2CC("
361 + "'/', '_').toString();\n"
362 + " var dot = n.replace__Ljava_lang_String_2CC("
363 + "'/', '.').toString();\n"
364 + " exports.loadClass(dot);\n"
365 + " vm[cls] = exports[cls];\n"
366 + " return vm[cls](inst);\n"
371 protected void generateEpilogue() throws IOException {
376 protected String generateClass(String className) throws IOException {
377 ClassData classData = classDataCache.getClassData(className);
378 if (classData == null) {
379 out.append("\n").append(assignClass(
380 className.replace('/', '_')))
381 .append("function() {\n return link('")
383 .append("', arguments.length == 0 || arguments[0] === true);"
389 return compile(classData);
393 protected String getExportsObject() {