launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/JsClassLoader.java
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.bck2brwsr.launcher.fximpl;
20 import java.io.IOException;
21 import java.io.InputStream;
23 import java.net.URLClassLoader;
24 import java.util.ArrayList;
25 import java.util.List;
26 import org.objectweb.asm.AnnotationVisitor;
27 import org.objectweb.asm.ClassReader;
28 import org.objectweb.asm.ClassVisitor;
29 import org.objectweb.asm.ClassWriter;
30 import org.objectweb.asm.Label;
31 import org.objectweb.asm.MethodVisitor;
32 import org.objectweb.asm.Opcodes;
33 import org.objectweb.asm.Type;
34 import org.objectweb.asm.signature.SignatureReader;
35 import org.objectweb.asm.signature.SignatureVisitor;
39 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
41 abstract class JsClassLoader extends ClassLoader {
42 JsClassLoader(ClassLoader parent) {
47 protected abstract URL findResource(String name);
50 protected Class<?> findClass(String name) throws ClassNotFoundException {
51 URL u = findResource(name.replace('.', '/') + ".class");
53 InputStream is = null;
56 ClassReader cr = new ClassReader(is);
57 ClassWriter w = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
58 FindInClass fic = new FindInClass(w);
60 byte[] arr = w.toByteArray();
61 return defineClass(name, arr, 0, arr.length);
62 } catch (IOException ex) {
63 throw new ClassNotFoundException("Can't load " + name, ex);
66 if (is != null) is.close();
67 } catch (IOException ex) {
68 throw new ClassNotFoundException(null, ex);
72 if (name.startsWith("org.apidesign.bck2brwsr.launcher.fximpl.Fn")) {
73 return Class.forName(name);
76 return super.findClass(name);
79 protected abstract Fn defineFn(String code, String... names);
82 private static final class FindInClass extends ClassVisitor {
85 public FindInClass(ClassVisitor cv) {
86 super(Opcodes.ASM4, cv);
90 public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
92 super.visit(version, access, name, signature, superName, interfaces);
98 public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
99 return new FindInMethod(name, desc,
100 super.visitMethod(access, name, desc, signature, exceptions)
104 private final class FindInMethod extends MethodVisitor {
105 private final String name;
106 private final String desc;
107 private List<String> args;
110 public FindInMethod(String name, String desc, MethodVisitor mv) {
111 super(Opcodes.ASM4, mv);
117 public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
118 if ("Lorg/apidesign/bck2brwsr/core/JavaScriptBody;".equals(desc)) { // NOI18N
119 return new FindInAnno();
121 return super.visitAnnotation(desc, visible);
124 private void generateJSBody(List<String> args, String body) {
130 public void visitCode() {
135 super.visitFieldInsn(
136 Opcodes.GETSTATIC, FindInClass.this.name,
137 "$$bck2brwsr$$" + name,
138 "Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;"
140 super.visitInsn(Opcodes.DUP);
141 Label ifNotNull = new Label();
142 super.visitJumpInsn(Opcodes.IFNONNULL, ifNotNull);
145 super.visitInsn(Opcodes.POP);
146 super.visitLdcInsn(Type.getObjectType(FindInClass.this.name));
147 super.visitLdcInsn(body);
148 super.visitIntInsn(Opcodes.SIPUSH, args.size());
149 super.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/String");
150 for (int i = 0; i < args.size(); i++) {
151 String name = args.get(i);
152 super.visitInsn(Opcodes.DUP);
153 super.visitIntInsn(Opcodes.BIPUSH, i);
154 super.visitLdcInsn(name);
155 super.visitInsn(Opcodes.AASTORE);
157 super.visitMethodInsn(Opcodes.INVOKESTATIC,
158 "org/apidesign/bck2brwsr/launcher/fximpl/Fn", "define",
159 "(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/String;)Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;"
163 super.visitLabel(ifNotNull);
164 super.visitIntInsn(Opcodes.SIPUSH, args.size());
165 super.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
167 class SV extends SignatureVisitor {
168 private boolean nowReturn;
169 private Type returnType;
177 public void visitBaseType(char descriptor) {
178 final Type t = Type.getType("" + descriptor);
183 FindInMethod.super.visitInsn(Opcodes.DUP);
184 FindInMethod.super.visitIntInsn(Opcodes.SIPUSH, index);
185 FindInMethod.super.visitVarInsn(t.getOpcode(Opcodes.ILOAD), index);
187 switch (descriptor) {
188 case 'I': factory = "java/lang/Integer"; break;
189 case 'J': factory = "java/lang/Long"; break;
190 case 'S': factory = "java/lang/Short"; break;
191 case 'F': factory = "java/lang/Float"; break;
192 case 'D': factory = "java/lang/Double"; break;
193 case 'Z': factory = "java/lang/Boolean"; break;
194 case 'C': factory = "java/lang/Character"; break;
195 case 'B': factory = "java/lang/Byte"; break;
196 default: throw new IllegalStateException(t.toString());
198 FindInMethod.super.visitMethodInsn(Opcodes.INVOKESTATIC,
199 factory, "valueOf", "(" + descriptor + ")L" + factory + ";"
201 FindInMethod.super.visitInsn(Opcodes.AASTORE);
206 public void visitClassType(String name) {
208 returnType = Type.getObjectType(name);
211 FindInMethod.super.visitInsn(Opcodes.DUP);
212 FindInMethod.super.visitIntInsn(Opcodes.SIPUSH, index);
213 FindInMethod.super.visitVarInsn(Opcodes.ALOAD, index);
214 FindInMethod.super.visitInsn(Opcodes.AASTORE);
219 public SignatureVisitor visitReturnType() {
227 SignatureReader sr = new SignatureReader(desc);
230 super.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
231 "org/apidesign/bck2brwsr/launcher/fximpl/Fn", "invoke", "([Ljava/lang/Object;)Ljava/lang/Object;"
233 switch (sv.returnType.getSort()) {
235 super.visitInsn(Opcodes.RETURN);
239 super.visitTypeInsn(Opcodes.CHECKCAST, sv.returnType.getInternalName());
240 super.visitInsn(Opcodes.ARETURN);
243 super.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Number");
244 super.visitMethodInsn(Opcodes.INVOKEVIRTUAL,
245 "java/lang/Number", sv.returnType.getClassName() + "Value", "()" + sv.returnType.getDescriptor()
247 super.visitInsn(sv.returnType.getOpcode(Opcodes.IRETURN));
252 public void visitEnd() {
255 FindInClass.this.visitField(
256 Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC,
257 "$$bck2brwsr$$" + name,
258 "Lorg/apidesign/bck2brwsr/launcher/fximpl/Fn;",
268 private final class FindInAnno extends AnnotationVisitor {
269 private List<String> args = new ArrayList<String>();
272 public FindInAnno() {
277 public void visit(String name, Object value) {
279 args.add((String) value);
282 assert name.equals("body");
283 body = (String) value;
287 public AnnotationVisitor visitArray(String name) {
292 public void visitEnd() {
294 generateJSBody(args, body);