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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiRegisterAttributes.java @ 5506:56860d3f9f39

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More refactorings and renamings in preparation of ci/ri split.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 18:12:01 +0200
parents graal/com.oracle.max.cri/src/com/oracle/max/cri/ri/RiRegisterAttributes.java@aaac4894175c
children
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1 /*
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2 * Copyright (c) 2010, 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.oracle.max.cri.ci;
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24
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25 import java.util.*;
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26
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27 /**
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28 * A collection of register attributes. The specific attribute values for a register may be
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29 * local to a compilation context. For example, a {@link CiRegisterConfig} in use during
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30 * a compilation will determine which registers are callee saved.
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31 */
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32 public class CiRegisterAttributes {
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33
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34 /**
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35 * Denotes a register whose value preservation (if required) across a call is the responsibility of the caller.
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36 */
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37 public final boolean isCallerSave;
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38
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39 /**
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40 * Denotes a register whose value preservation (if required) across a call is the responsibility of the callee.
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41 */
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42 public final boolean isCalleeSave;
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43
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44 /**
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45 * Denotes a register that is available for use by a register allocator.
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46 */
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47 public final boolean isAllocatable;
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48
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49 /**
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50 * Denotes a register guaranteed to be non-zero if read in compiled Java code.
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51 * For example, a register dedicated to holding the current thread.
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52 */
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53 public boolean isNonZero;
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54
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55 public CiRegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) {
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56 this.isCallerSave = isCallerSave;
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57 this.isCalleeSave = isCalleeSave;
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58 this.isAllocatable = isAllocatable;
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59 }
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60
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61 public static final CiRegisterAttributes NONE = new CiRegisterAttributes(false, false, false);
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62
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63 /**
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64 * Creates a map from register {@linkplain CiRegister#number numbers} to register
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65 * {@linkplain CiRegisterAttributes attributes} for a given register configuration and set of
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66 * registers.
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67 *
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68 * @param registerConfig a register configuration
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69 * @param registers a set of registers
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70 * @return an array whose length is the max register number in {@code registers} plus 1. An element at index i holds
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71 * the attributes of the register whose number is i.
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72 */
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73 public static CiRegisterAttributes[] createMap(CiRegisterConfig registerConfig, CiRegister[] registers) {
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74 CiRegisterAttributes[] map = new CiRegisterAttributes[registers.length];
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75 for (CiRegister reg : registers) {
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76 if (reg != null) {
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77 CiCalleeSaveLayout csl = registerConfig.getCalleeSaveLayout();
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78 CiRegisterAttributes attr = new CiRegisterAttributes(
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79 Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg),
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80 csl == null ? false : Arrays.asList(csl.registers).contains(reg),
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81 Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg));
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82 if (map.length <= reg.number) {
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83 map = Arrays.copyOf(map, reg.number + 1);
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84 }
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85 map[reg.number] = attr;
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86 }
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87 }
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88 for (int i = 0; i < map.length; i++) {
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89 if (map[i] == null) {
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90 map[i] = NONE;
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91 }
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92 }
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93 return map;
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94 }
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95 }