Mercurial > hg > graal-compiler
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotSymbol.java @ 15291:471e28b8f03b
Move UnsafeAccess to graal.compiler.common.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Tue, 22 Apr 2014 15:24:14 +0200 |
parents | 96bb07a5d667 |
children |
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/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.hotspot; import static com.oracle.graal.compiler.common.UnsafeAccess.*; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import java.io.*; import com.oracle.graal.compiler.common.*; /** * Represents a metaspace {@code Symbol}. */ public class HotSpotSymbol { private final long metaspaceSymbol; public HotSpotSymbol(long metaspaceSymbol) { assert metaspaceSymbol != 0; this.metaspaceSymbol = metaspaceSymbol; } /** * Decodes this {@code Symbol} and returns the symbol string as {@link java.lang.String}. */ public String asString() { return readModifiedUTF8(asByteArray()); } private static String readModifiedUTF8(byte[] buf) { try { final int length = buf.length; byte[] tmp = new byte[length + 2]; // write modified UTF-8 length as short in big endian tmp[0] = (byte) ((length >>> 8) & 0xFF); tmp[1] = (byte) ((length >>> 0) & 0xFF); // copy the data System.arraycopy(buf, 0, tmp, 2, length); DataInputStream dis = new DataInputStream(new ByteArrayInputStream(tmp)); return dis.readUTF(); } catch (IOException e) { // This should never happen so let's fail hard here. throw GraalInternalError.shouldNotReachHere("error reading symbol: " + e); } } private byte[] asByteArray() { final int length = getLength(); byte[] result = new byte[length]; for (int index = 0; index < length; index++) { result[index] = getByteAt(index); } return result; } private int getLength() { return unsafe.getShort(metaspaceSymbol + runtime().getConfig().symbolLengthOffset); } private byte getByteAt(int index) { return unsafe.getByte(metaspaceSymbol + runtime().getConfig().symbolBodyOffset + index); } }