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annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterAttributes.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 9ac04c6047c8
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 jdk.vm.ci.code;
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24
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25 import java.util.Arrays;
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26 import java.util.Collections;
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27 import java.util.List;
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28
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29 /**
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30 * A collection of register attributes. The specific attribute values for a register may be local to
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31 * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will
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32 * determine which registers are callee saved.
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33 */
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34 public class RegisterAttributes {
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35
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36 private final boolean callerSave;
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37 private final boolean calleeSave;
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38 private final boolean allocatable;
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39
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40 public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) {
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41 this.callerSave = isCallerSave;
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42 this.calleeSave = isCalleeSave;
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43 this.allocatable = isAllocatable;
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44 }
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45
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46 public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false);
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48 /**
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49 * Creates a map from register {@linkplain Register#number numbers} to register
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50 * {@linkplain RegisterAttributes attributes} for a given register configuration and set of
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51 * registers.
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52 *
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53 * @param registerConfig a register configuration
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54 * @param registers a set of registers
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55 * @return an array whose length is the max register number in {@code registers} plus 1. An
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56 * element at index i holds the attributes of the register whose number is i.
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57 */
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58 public static RegisterAttributes[] createMap(RegisterConfig registerConfig, RegisterArray registers) {
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59 RegisterAttributes[] map = new RegisterAttributes[registers.size()];
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60 List<Register> callerSaveRegisters = registerConfig.getCallerSaveRegisters().asList();
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61 List<Register> calleeSaveRegisters = registerConfig.getCalleeSaveRegisters() == null ? Collections.emptyList() : registerConfig.getCalleeSaveRegisters().asList();
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62 List<Register> allocatableRegisters = registerConfig.getAllocatableRegisters().asList();
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63 for (Register reg : registers) {
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64 if (reg != null) {
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65 RegisterAttributes attr = new RegisterAttributes(callerSaveRegisters.contains(reg), calleeSaveRegisters.contains(reg), allocatableRegisters.contains(reg));
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66 if (map.length <= reg.number) {
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67 map = Arrays.copyOf(map, reg.number + 1);
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68 }
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69 map[reg.number] = attr;
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70 }
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71 }
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72 for (int i = 0; i < map.length; i++) {
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73 if (map[i] == null) {
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74 map[i] = NONE;
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75 }
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76 }
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77 return map;
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78 }
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79
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80 /**
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81 * @return {@code true} if a register is available for use by a register allocator otherwise
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82 * {@code false}
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83 */
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84 public boolean isAllocatable() {
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85 return allocatable;
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86 }
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87
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88 /**
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89 * @return {@code true} if a register whose value preservation (if required) across a call is
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90 * the responsibility of the callee otherwise {@code false}
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91 */
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92 public boolean isCalleeSave() {
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93 return calleeSave;
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94 }
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96 /**
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97 * @return {@code true} if a register whose value preservation (if required) across a call is
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98 * the responsibility of the caller otherwise {@code false}
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99 */
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100 public boolean isCallerSave() {
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101 return callerSave;
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102 }
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103 }