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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiRegisterValue.java @ 4169:f5328dda9714

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Initial commit of SSA-based spill-all register assignment
author Christian Wimmer <Christian.Wimmer@Oracle.com>
date Wed, 28 Dec 2011 18:13:25 -0800
parents bc8527f3071c
children de7b3e7ae528
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.cri.ci;
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24
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25 /**
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26 * Denotes a register that stores a value of a fixed kind. There is exactly one (canonical) instance of {@code
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27 * CiRegisterValue} for each ({@link CiRegister}, {@link CiKind}) pair. Use {@link CiRegister#asValue(CiKind)} to
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28 * retrieve the canonical {@link CiRegisterValue} instance for a given (register,kind) pair.
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29 */
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30 public final class CiRegisterValue extends CiValue {
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31 private static final long serialVersionUID = 7999341472196897163L;
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32
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33 /**
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34 * The register.
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35 */
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36 public final CiRegister reg;
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37
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38 /**
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39 * Should only be called from {@link CiRegister#CiRegister} to ensure canonicalization.
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40 */
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41 protected CiRegisterValue(CiKind kind, CiRegister register) {
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42 super(kind);
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43 this.reg = register;
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44 }
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45
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46 @Override
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47 public int hashCode() {
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48 return (reg.number << 4) ^ kind.ordinal();
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49 }
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50
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51 @Override
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52 public boolean equals(Object o) {
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53 return o == this;
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54 }
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55
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56 @Override
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57 public boolean equalsIgnoringKind(CiValue other) {
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58 if (other instanceof CiRegisterValue) {
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59 return ((CiRegisterValue) other).reg == reg;
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60 }
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61 return false;
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62 }
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63
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64 @Override
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65 public String toString() {
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66 return reg.name + kindSuffix();
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67 }
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68
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69 @Override
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70 public CiRegister asRegister() {
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71 return reg;
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72 }
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73 }