Mercurial > hg > truffle
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterValue.java @ 9631:3c9aeef2702c
Value: provide proper `hashCode()' and `equals()' implementations
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Fri, 10 May 2013 12:43:43 +0200 |
parents | 149fe42411df |
children | 65d7696fb58a |
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/* * Copyright (c) 2009, 2012, 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.api.code; import com.oracle.graal.api.meta.*; /** * Denotes a register that stores a value of a fixed kind. There is exactly one (canonical) instance * of {@link RegisterValue} for each ({@link Register}, {@link Kind}) pair. Use * {@link Register#asValue(PlatformKind)} to retrieve the canonical {@link RegisterValue} instance * for a given (register,kind) pair. */ public final class RegisterValue extends AllocatableValue { private static final long serialVersionUID = 7999341472196897163L; private final Register reg; /** * Should only be called from {@link Register#Register} to ensure canonicalization. */ protected RegisterValue(PlatformKind kind, Register register) { super(kind); this.reg = register; } @Override public String toString() { return getRegister().name + getKindSuffix(); } /** * @return the register that contains the value */ public Register getRegister() { return reg; } @Override public int hashCode() { return 31 * super.hashCode() + ((reg == null) ? 0 : reg.hashCode()); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (!super.equals(obj)) { return false; } if (getClass() != obj.getClass()) { return false; } RegisterValue other = (RegisterValue) obj; if (reg == null) { if (other.reg != null) { return false; } } else if (!reg.equals(other.reg)) { return false; } return true; } }