Mercurial > hg > truffle
view graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/StringSubstitutions.java @ 13956:fca29edf5667
experimental CompilerDirectives.unsafeGetFinal*
author | Andreas Woess <andreas.woess@jku.at> |
---|---|
date | Fri, 14 Feb 2014 16:45:53 +0100 |
parents | 63bb635911ab |
children | faa6fda7ee36 |
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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.replacements; import static com.oracle.graal.graph.UnsafeAccess.*; import java.lang.reflect.*; import com.oracle.graal.api.replacements.*; import com.oracle.graal.graph.*; import com.oracle.graal.replacements.nodes.*; /** * Substitutions for {@link java.lang.String} methods. */ @ClassSubstitution(java.lang.String.class) public class StringSubstitutions { /** * Offset of the {@link String#value} field. */ @SuppressWarnings("javadoc") private static final long valueOffset; static { try { Field valueField = String.class.getDeclaredField("value"); valueOffset = unsafe.objectFieldOffset(valueField); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException e) { throw new GraalInternalError(e); } } @MethodSubstitution(isStatic = false) public static boolean equals(final String thisString, Object obj) { if (thisString == obj) { return true; } if (!(obj instanceof String)) { return false; } String thatString = (String) obj; if (thisString.length() != thatString.length()) { return false; } if (thisString.length() == 0) { return true; } final char[] thisArray = (char[]) unsafe.getObject(thisString, valueOffset); final char[] thatArray = (char[]) unsafe.getObject(thatString, valueOffset); return CharArrayEqualsNode.equals(thisArray, thatArray, thisArray.length); } }