1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VMLazy.java Tue Feb 26 16:54:16 2013 +0100
1.3 @@ -0,0 +1,155 @@
1.4 +/**
1.5 + * Back 2 Browser Bytecode Translator
1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details.
1.16 + *
1.17 + * You should have received a copy of the GNU General Public License
1.18 + * along with this program. Look for COPYING file in the top folder.
1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 + */
1.21 +package org.apidesign.vm4brwsr;
1.22 +
1.23 +import java.io.ByteArrayInputStream;
1.24 +import java.io.IOException;
1.25 +import java.io.InputStream;
1.26 +import java.lang.reflect.Array;
1.27 +import org.apidesign.bck2brwsr.core.JavaScriptBody;
1.28 +
1.29 +/**
1.30 + *
1.31 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.32 + */
1.33 +final class VMLazy {
1.34 + private final Object loader;
1.35 + private final Object[] args;
1.36 +
1.37 + private VMLazy(Object loader, Object[] args) {
1.38 + this.loader = loader;
1.39 + this.args = args;
1.40 + }
1.41 +
1.42 + static void init() {
1.43 + }
1.44 +
1.45 + static Object load(Object loader, String name, Object[] arguments)
1.46 + throws IOException, ClassNotFoundException {
1.47 + return new VMLazy(loader, arguments).load(name, false);
1.48 + }
1.49 +
1.50 + static byte[] loadBytes(Object loader, String name, Object[] arguments) throws Exception {
1.51 + return Zips.loadFromCp(arguments, name);
1.52 + }
1.53 +
1.54 + private Object load(String name, boolean instance)
1.55 + throws IOException, ClassNotFoundException {
1.56 + String res = name.replace('.', '/') + ".class";
1.57 + byte[] arr = Zips.loadFromCp(args, res);
1.58 + if (arr == null) {
1.59 + throw new ClassNotFoundException(name);
1.60 + }
1.61 +// beingDefined(loader, name);
1.62 + StringBuilder out = new StringBuilder();
1.63 + out.append("var loader = arguments[0];\n");
1.64 + out.append("var vm = loader.vm;\n");
1.65 + int prelude = out.length();
1.66 + String initCode = new Gen(this, out).compile(new ByteArrayInputStream(arr));
1.67 + String code = out.toString().toString();
1.68 +// dump("Loading " + name);
1.69 + dump(code);
1.70 + String under = name.replace('.', '_');
1.71 + Object fn = applyCode(loader, under, code, instance);
1.72 +
1.73 + if (!initCode.isEmpty()) {
1.74 + out.setLength(prelude);
1.75 + out.append(initCode);
1.76 + code = out.toString().toString();
1.77 + dump(code);
1.78 + applyCode(loader, null, code, false);
1.79 + }
1.80 +
1.81 + return fn;
1.82 + }
1.83 +
1.84 +// @JavaScriptBody(args = "s", body = "java.lang.System.out.println(s.toString());")
1.85 + static void dump(String s) {
1.86 + }
1.87 +
1.88 +/* possibly not needed:
1.89 + @JavaScriptBody(args = {"loader", "n" }, body =
1.90 + "var cls = n.replace__Ljava_lang_String_2CC(n, '.','_').toString();" +
1.91 + "loader.vm[cls] = true;\n"
1.92 + )
1.93 + private static native void beingDefined(Object loader, String name);
1.94 +*/
1.95 +
1.96 +
1.97 + @JavaScriptBody(args = {"loader", "name", "script", "instance" }, body =
1.98 + "try {\n" +
1.99 + " new Function(script)(loader, name);\n" +
1.100 + "} catch (ex) {\n" +
1.101 + " throw 'Cannot compile ' + name + ' ' + ex + ' line: ' + ex.lineNumber + ' script:\\n' + script;\n" +
1.102 + "}\n" +
1.103 + "return name != null ? vm[name](instance) : null;\n"
1.104 + )
1.105 + private static native Object applyCode(Object loader, String name, String script, boolean instance);
1.106 +
1.107 +
1.108 + private static final class Gen extends ByteCodeToJavaScript {
1.109 + private final VMLazy lazy;
1.110 +
1.111 + public Gen(VMLazy vm, Appendable out) {
1.112 + super(out);
1.113 + this.lazy = vm;
1.114 + }
1.115 +
1.116 + @JavaScriptBody(args = {"n"},
1.117 + body =
1.118 + "var cls = n.replace__Ljava_lang_String_2CC('/','_').toString();"
1.119 + + "\nvar dot = n.replace__Ljava_lang_String_2CC('/','.').toString();"
1.120 + + "\nvar lazy = this._lazy();"
1.121 + + "\nvar loader = lazy._loader();"
1.122 + + "\nvar vm = loader.vm;"
1.123 + + "\nif (vm[cls]) return false;"
1.124 + + "\nvm[cls] = function() {"
1.125 + + "\n var instance = arguments.length == 0 || arguments[0] === true;"
1.126 + + "\n return lazy.load__Ljava_lang_Object_2Ljava_lang_String_2Z(dot, instance);"
1.127 + + "\n};"
1.128 + + "\nreturn true;")
1.129 + @Override
1.130 + protected boolean requireReference(String internalClassName) {
1.131 + throw new UnsupportedOperationException();
1.132 + }
1.133 +
1.134 + @Override
1.135 + protected void requireScript(String resourcePath) throws IOException {
1.136 + InputStream is = getClass().getResourceAsStream(resourcePath);
1.137 + StringBuilder sb = new StringBuilder();
1.138 + for (;;) {
1.139 + int ch = is.read();
1.140 + if (ch == -1) {
1.141 + break;
1.142 + }
1.143 + sb.append((char)ch);
1.144 + }
1.145 + applyCode(lazy.loader, null, sb.toString(), false);
1.146 + }
1.147 +
1.148 + @Override
1.149 + String assignClass(String className) {
1.150 + return "vm[arguments[1]]=";
1.151 + }
1.152 +
1.153 + @Override
1.154 + String accessClass(String classOperation) {
1.155 + return "vm." + classOperation;
1.156 + }
1.157 + }
1.158 +}