nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/AstDeserializer.java
author sundar
Thu, 04 Dec 2014 20:40:48 +0530
changeset 27825 cbb30ab946ee
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child 29133 1cd7d8af99ba
permissions -rw-r--r--
8066683: nashorn test failures after modular image changes Reviewed-by: attila, jlaskey
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/*
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 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.nashorn.internal.runtime;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.zip.InflaterInputStream;
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import jdk.nashorn.internal.ir.FunctionNode;
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/**
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 * This static utility class performs deserialization of FunctionNode ASTs from a byte array.
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 * The format is a standard Java serialization stream, deflated.
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 */
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final class AstDeserializer {
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    static FunctionNode deserialize(final byte[] serializedAst) {
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        // FIXME: do we need this doPrivileged block at all?
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        return AccessController.doPrivileged(new PrivilegedAction<FunctionNode>() {
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            @Override
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            public FunctionNode run() {
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                try {
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                    return (FunctionNode)new ObjectInputStream(new InflaterInputStream(
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                        new ByteArrayInputStream(serializedAst))).readObject();
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                } catch (final ClassNotFoundException | IOException e) {
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                    // This is internal, can't happen
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                    throw new AssertionError("Unexpected exception deserializing function", e);
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                }
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            }
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        });
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    }
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}