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annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterAttributes.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/RegisterAttributes.java@1cde96b96673
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.jvmci.code;
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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 local to
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29 * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will
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30 * determine which registers are callee saved.
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31 */
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32 public class RegisterAttributes {
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33
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34 private final boolean callerSave;
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35 private final boolean calleeSave;
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36 private final boolean allocatable;
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37
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38 public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) {
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39 this.callerSave = isCallerSave;
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40 this.calleeSave = isCalleeSave;
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41 this.allocatable = isAllocatable;
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42 }
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43
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44 public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false);
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45
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46 /**
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47 * Creates a map from register {@linkplain Register#number numbers} to register
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48 * {@linkplain RegisterAttributes attributes} for a given register configuration and set of
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49 * registers.
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50 *
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51 * @param registerConfig a register configuration
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52 * @param registers a set of registers
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53 * @return an array whose length is the max register number in {@code registers} plus 1. An
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54 * element at index i holds the attributes of the register whose number is i.
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55 */
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56 public static RegisterAttributes[] createMap(RegisterConfig registerConfig, Register[] registers) {
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57 RegisterAttributes[] map = new RegisterAttributes[registers.length];
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58 for (Register reg : registers) {
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59 if (reg != null) {
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60 CalleeSaveLayout csl = registerConfig.getCalleeSaveLayout();
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61 RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg),
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62 csl == null ? false : Arrays.asList(csl.registers).contains(reg), Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg));
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63 if (map.length <= reg.number) {
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64 map = Arrays.copyOf(map, reg.number + 1);
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65 }
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66 map[reg.number] = attr;
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67 }
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68 }
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69 for (int i = 0; i < map.length; i++) {
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70 if (map[i] == null) {
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71 map[i] = NONE;
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72 }
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73 }
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74 return map;
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75 }
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77 /**
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78 * @return Denotes a register that is available for use by a register allocator.
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79 */
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80 public boolean isAllocatable() {
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81 return allocatable;
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82 }
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83
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84 /**
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85 * @return Denotes a register whose value preservation (if required) across a call is the
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86 * responsibility of the callee.
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87 */
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88 public boolean isCalleeSave() {
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89 return calleeSave;
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90 }
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91
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92 /**
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93 * @return Denotes a register whose value preservation (if required) across a call is the
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94 * responsibility of the caller.
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95 */
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96 public boolean isCallerSave() {
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97 return callerSave;
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98 }
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99 }