1 /*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.nashorn.internal.runtime;
27
28 import java.lang.module.ModuleDescriptor;
29 import java.lang.module.ModuleDescriptor.Modifier;
30 import java.security.CodeSource;
31 import java.util.Objects;
32 import java.util.Set;
33
34 /**
35 * Responsible for loading script generated classes.
36 *
37 */
38 final class ScriptLoader extends NashornLoader {
39 private static final String NASHORN_PKG_PREFIX = "jdk.nashorn.internal.";
40
41 private volatile boolean structureAccessAdded;
42 private final Context context;
43 private final Module scriptModule;
44
45 /*package-private*/ Context getContext() {
46 return context;
47 }
48
49 /**
50 * Constructor.
51 */
52 ScriptLoader(final Context context) {
53 super(context.getStructLoader());
54 this.context = context;
55
56 // new scripts module, it's specific exports and read-edges
57 scriptModule = createModule("jdk.scripting.nashorn.scripts");
58
59 // specific exports from nashorn to new scripts module
60 NASHORN_MODULE.addExports(OBJECTS_PKG, scriptModule);
61 NASHORN_MODULE.addExports(RUNTIME_PKG, scriptModule);
62 NASHORN_MODULE.addExports(RUNTIME_ARRAYS_PKG, scriptModule);
63 NASHORN_MODULE.addExports(RUNTIME_LINKER_PKG, scriptModule);
64 NASHORN_MODULE.addExports(SCRIPTS_PKG, scriptModule);
65
66 // nashorn needs to read scripts module methods,fields
67 NASHORN_MODULE.addReads(scriptModule);
68 }
69
70 private Module createModule(final String moduleName) {
71 final Module structMod = context.getStructLoader().getModule();
72 final ModuleDescriptor.Builder builder =
73 ModuleDescriptor.newModule(moduleName, Set.of(Modifier.SYNTHETIC))
74 .requires("java.logging")
75 .requires(NASHORN_MODULE.getName())
76 .requires(structMod.getName())
77 .packages(Set.of(SCRIPTS_PKG))
78 .exports(SCRIPTS_PKG, Set.of(NASHORN_MODULE.getName()));
79
80 if (Context.javaSqlFound) {
81 builder.requires("java.sql");
82 }
83
84 if (Context.javaSqlRowsetFound) {
85 builder.requires("java.sql.rowset");
86 }
87
88 final ModuleDescriptor descriptor = builder.build();
89
90 final Module mod = Context.createModuleTrusted(structMod.getLayer(), descriptor, this);
91 loadModuleManipulator();
92 return mod;
93 }
94
95 @Override
96 protected Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
97 checkPackageAccess(name);
98 final Class<?> cl = super.loadClass(name, resolve);
99 if (!structureAccessAdded) {
100 final StructureLoader structLoader = context.getStructLoader();
101 if (cl.getClassLoader() == structLoader) {
102 structureAccessAdded = true;
103 structLoader.addModuleExport(scriptModule);
104 }
105 }
106 return cl;
107 }
108
109 @Override
110 protected Class<?> findClass(final String name) throws ClassNotFoundException {
111 final ClassLoader appLoader = context.getAppLoader();
112
113 /*
114 * If the appLoader is null, don't bother side-delegating to it!
115 * Bootloader has been already attempted via parent loader
116 * delegation from the "loadClass" method.
117 *
118 * Also, make sure that we don't delegate to the app loader
119 * for nashorn's own classes or nashorn generated classes!
120 */
121 if (appLoader == null || name.startsWith(NASHORN_PKG_PREFIX)) {
122 throw new ClassNotFoundException(name);
123 }
124
125 /*
126 * This split-delegation is used so that caller loader
127 * based resolutions of classes would work. For example,
128 * java.sql.DriverManager uses caller's class loader to
129 * get Driver instances. Without this split-delegation
130 * a script class evaluating DriverManager.getDrivers()
131 * will not get back any JDBC driver!
132 */
133 return appLoader.loadClass(name);
134 }
135
136 // package-private and private stuff below this point
137
138 /**
139 * Install a class for use by the Nashorn runtime
140 *
141 * @param name Binary name of class.
142 * @param data Class data bytes.
143 * @param cs CodeSource code source of the class bytes.
144 *
145 * @return Installed class.
146 */
147 synchronized Class<?> installClass(final String name, final byte[] data, final CodeSource cs) {
148 return defineClass(name, data, 0, data.length, Objects.requireNonNull(cs));
149 }
150 }