1 /*
   2  * Copyright (c) 2010, 2014, 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.io.Serializable;
  29 import java.util.Arrays;
  30 import java.util.HashMap;
  31 import java.util.Map;
  32 
  33 /**
  34  * Class representing a persistent compiled script.
  35  */
  36 public final class StoredScript implements Serializable {
  37 
  38     /** Compilation id */
  39     private final int compilationId;
  40 
  41     /** Main class name. */
  42     private final String mainClassName;
  43 
  44     /** Map of class names to class bytes. */
  45     private final Map<String, byte[]> classBytes;
  46 
  47     /** Constants array. */
  48     private final Object[] constants;
  49 
  50     /** Function initializers */
  51     private final Map<Integer, FunctionInitializer> initializers;
  52 
  53     private static final long serialVersionUID = 2958227232195298340L;
  54 
  55     /**
  56      * Constructor.
  57      *
  58      * @param compilationId compilation id
  59      * @param mainClassName main class name
  60      * @param classBytes map of class names to class bytes
  61      * @param initializers initializer map, id -&gt; FunctionInitializer
  62      * @param constants constants array
  63      */
  64     public StoredScript(final int compilationId, final String mainClassName, final Map<String, byte[]> classBytes, final Map<Integer, FunctionInitializer> initializers, final Object[] constants) {
  65         this.compilationId = compilationId;
  66         this.mainClassName = mainClassName;
  67         this.classBytes = classBytes;
  68         this.constants = constants;
  69         this.initializers = initializers;
  70     }
  71 
  72     /**
  73      * Get the compilation id for this StoredScript
  74      * @return compilation id
  75      */
  76     public int getCompilationId() {
  77         return compilationId;
  78     }
  79 
  80     private Map<String, Class<?>> installClasses(final Source source, final CodeInstaller<ScriptEnvironment> installer) {
  81         final Map<String, Class<?>> installedClasses = new HashMap<>();
  82         final byte[]   mainClassBytes = classBytes.get(mainClassName);
  83         final Class<?> mainClass      = installer.install(mainClassName, mainClassBytes);
  84 
  85         installedClasses.put(mainClassName, mainClass);
  86 
  87         for (final Map.Entry<String, byte[]> entry : classBytes.entrySet()) {
  88             final String className = entry.getKey();
  89 
  90             if (!className.equals(mainClassName)) {
  91                 installedClasses.put(className, installer.install(className, entry.getValue()));
  92             }
  93         }
  94 
  95         installer.initialize(installedClasses.values(), source, constants);
  96         return installedClasses;
  97     }
  98 
  99     FunctionInitializer installFunction(final RecompilableScriptFunctionData data, final CodeInstaller<ScriptEnvironment> installer) {
 100         final Map<String, Class<?>> installedClasses = installClasses(data.getSource(), installer);
 101 
 102         assert initializers != null;
 103         assert initializers.size() == 1;
 104         final FunctionInitializer initializer = initializers.values().iterator().next();
 105 
 106         for (int i = 0; i < constants.length; i++) {
 107             if (constants[i] instanceof RecompilableScriptFunctionData) {
 108                 // replace deserialized function data with the ones we already have
 109                 final RecompilableScriptFunctionData newData = data.getScriptFunctionData(((RecompilableScriptFunctionData) constants[i]).getFunctionNodeId());
 110                 assert newData != null;
 111                 newData.initTransients(data.getSource(), installer);
 112                 constants[i] = newData;
 113             }
 114         }
 115 
 116         initializer.setCode(installedClasses.get(initializer.getClassName()));
 117         return initializer;
 118     }
 119 
 120     /**
 121      * Install as script.
 122      *
 123      * @param source the source
 124      * @param installer the installer
 125      * @return main script class
 126      */
 127     Class<?> installScript(final Source source, final CodeInstaller<ScriptEnvironment> installer) {
 128 
 129         final Map<String, Class<?>> installedClasses = installClasses(source, installer);
 130 
 131         for (final Object constant : constants) {
 132             if (constant instanceof RecompilableScriptFunctionData) {
 133                 final RecompilableScriptFunctionData data = (RecompilableScriptFunctionData) constant;
 134                 data.initTransients(source, installer);
 135                 final FunctionInitializer initializer = initializers.get(data.getFunctionNodeId());
 136                 if (initializer != null) {
 137                     initializer.setCode(installedClasses.get(initializer.getClassName()));
 138                     data.initializeCode(initializer);
 139                 }
 140             }
 141         }
 142 
 143         return installedClasses.get(mainClassName);
 144     }
 145 
 146     @Override
 147     public int hashCode() {
 148         int hash = mainClassName.hashCode();
 149         hash = 31 * hash + classBytes.hashCode();
 150         hash = 31 * hash + Arrays.hashCode(constants);
 151         return hash;
 152     }
 153 
 154     @Override
 155     public boolean equals(final Object obj) {
 156         if (obj == this) {
 157             return true;
 158         }
 159         if (!(obj instanceof StoredScript)) {
 160             return false;
 161         }
 162 
 163         final StoredScript cs = (StoredScript) obj;
 164         return mainClassName.equals(cs.mainClassName)
 165                 && classBytes.equals(cs.classBytes)
 166                 && Arrays.equals(constants, cs.constants);
 167     }
 168 }