Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ri/RiRegisterAttributes.java @ 4266:e2499e6d8aa7
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
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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.ri; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.oracle.max.cri.ci.*; |
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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 |
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31 * local to a compilation context. For example, a {@link RiRegisterConfig} in use during |
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32 * a compilation will determine which registers are callee saved. |
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33 */ |
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34 public class RiRegisterAttributes { |
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35 |
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36 /** |
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37 * Denotes a register whose value preservation (if required) across a call is the responsibility of the caller. |
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38 */ |
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39 public final boolean isCallerSave; |
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40 |
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41 /** |
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42 * Denotes a register whose value preservation (if required) across a call is the responsibility of the callee. |
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43 */ |
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44 public final boolean isCalleeSave; |
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45 |
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46 /** |
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47 * Denotes a register that is available for use by a register allocator. |
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48 */ |
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49 public final boolean isAllocatable; |
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50 |
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51 /** |
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52 * Denotes a register guaranteed to be non-zero if read in compiled Java code. |
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53 * For example, a register dedicated to holding the current thread. |
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54 */ |
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55 public boolean isNonZero; |
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56 |
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57 public RiRegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) { |
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58 this.isCallerSave = isCallerSave; |
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59 this.isCalleeSave = isCalleeSave; |
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60 this.isAllocatable = isAllocatable; |
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61 } |
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62 |
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63 public static final RiRegisterAttributes NONE = new RiRegisterAttributes(false, false, false); |
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64 |
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65 /** |
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66 * Creates a map from register {@linkplain CiRegister#number numbers} to register |
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67 * {@linkplain RiRegisterAttributes attributes} for a given register configuration and set of |
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68 * registers. |
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69 * |
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70 * @param registerConfig a register configuration |
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71 * @param registers a set of registers |
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72 * @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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73 * the attributes of the register whose number is i. |
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74 */ |
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75 public static RiRegisterAttributes[] createMap(RiRegisterConfig registerConfig, CiRegister[] registers) { |
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76 RiRegisterAttributes[] map = new RiRegisterAttributes[registers.length]; |
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77 for (CiRegister reg : registers) { |
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78 if (reg != null) { |
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79 CiCalleeSaveLayout csl = registerConfig.getCalleeSaveLayout(); |
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80 RiRegisterAttributes attr = new RiRegisterAttributes( |
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81 Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg), |
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82 csl == null ? false : Arrays.asList(csl.registers).contains(reg), |
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83 Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg)); |
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84 if (map.length <= reg.number) { |
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85 map = Arrays.copyOf(map, reg.number + 1); |
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86 } |
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87 map[reg.number] = attr; |
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88 } |
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89 } |
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90 for (int i = 0; i < map.length; i++) { |
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91 if (map[i] == null) { |
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92 map[i] = NONE; |
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93 } |
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94 } |
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95 return map; |
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96 } |
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97 } |