Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterAttributes.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/RegisterAttributes.java@ec96f33a101d |
children | 9e1235406b59 |
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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 |
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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 Register[] csr = registerConfig.getCalleeSaveRegisters(); |
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61 RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), csr == null ? false : Arrays.asList(csr).contains(reg), |
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62 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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76 |
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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 } |