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.IOException;
  29 import java.io.ObjectInputStream;
  30 import java.io.ObjectOutputStream;
  31 import java.io.Serializable;
  32 import java.lang.invoke.MethodType;
  33 import java.util.Map;
  34 import jdk.nashorn.internal.codegen.CompileUnit;
  35 import jdk.nashorn.internal.codegen.FunctionSignature;
  36 import jdk.nashorn.internal.codegen.types.Type;
  37 import jdk.nashorn.internal.ir.FunctionNode;
  38 
  39 /**
  40  * Class that contains information allowing us to look up a method handle implementing a JavaScript function
  41  * from a generated class. This is used both for code coming from codegen and for persistent serialized code.
  42  */
  43 public final class FunctionInitializer implements Serializable {
  44 
  45     private final String className;
  46     private final MethodType methodType;
  47     private final int flags;
  48     private transient Map<Integer, Type> invalidatedProgramPoints;
  49     private transient Class<?> code;
  50 
  51     private static final long serialVersionUID = -5420835725902966692L;
  52 
  53     /**
  54      * Constructor.
  55      *
  56      * @param functionNode the function node
  57      */
  58     public FunctionInitializer(final FunctionNode functionNode) {
  59         this(functionNode, null);
  60     }
  61 
  62     /**
  63      * Constructor.
  64      *
  65      * @param functionNode the function node
  66      * @param invalidatedProgramPoints invalidated program points
  67      */
  68     public FunctionInitializer(final FunctionNode functionNode, final Map<Integer, Type> invalidatedProgramPoints) {
  69         this.className  = functionNode.getCompileUnit().getUnitClassName();
  70         this.methodType = new FunctionSignature(functionNode).getMethodType();
  71         this.flags = functionNode.getFlags();
  72         this.invalidatedProgramPoints = invalidatedProgramPoints;
  73 
  74         final CompileUnit cu = functionNode.getCompileUnit();
  75         if (cu != null) {
  76             this.code = cu.getCode();
  77         }
  78 
  79         assert className != null;
  80     }
  81 
  82     /**
  83      * Returns the name of the class implementing the function.
  84      *
  85      * @return the class name
  86      */
  87     public String getClassName() {
  88         return className;
  89     }
  90 
  91     /**
  92      * Returns the type of the method implementing the function.
  93      *
  94      * @return the method type
  95      */
  96     public MethodType getMethodType() {
  97         return methodType;
  98     }
  99 
 100     /**
 101      * Returns the function flags.
 102      *
 103      * @return function flags
 104      */
 105     public int getFlags() {
 106         return flags;
 107     }
 108 
 109     /**
 110      * Returns the class implementing the function.
 111      *
 112      * @return the class
 113      */
 114     public Class<?> getCode() {
 115         return code;
 116     }
 117 
 118     /**
 119      * Set the class implementing the function
 120      * @param code the class
 121      */
 122     public void setCode(final Class<?> code) {
 123         // Make sure code has not been set and has expected class name
 124         if (this.code != null) {
 125             throw new IllegalStateException("code already set");
 126         }
 127         assert className.equals(code.getTypeName().replace('.', '/')) : "unexpected class name";
 128         this.code = code;
 129     }
 130 
 131     /**
 132      * Returns the map of invalidated program points.
 133      *
 134      * @return invalidated program points
 135      */
 136     public Map<Integer, Type> getInvalidatedProgramPoints() {
 137         return invalidatedProgramPoints;
 138     }
 139 
 140     private void writeObject(final ObjectOutputStream out) throws IOException {
 141         out.defaultWriteObject();
 142         Type.writeTypeMap(invalidatedProgramPoints, out);
 143     }
 144 
 145     private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
 146         in.defaultReadObject();
 147         invalidatedProgramPoints = Type.readTypeMap(in);
 148     }
 149 }