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annotate jvmci/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterSaveLayout.java @ 21798:395ac43a8578

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moved JVMCI sources from graal/ to jvmci/ directory
author Doug Simon <doug.simon@oracle.com>
date Tue, 09 Jun 2015 00:22:49 +0200
parents graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterSaveLayout.java@48c1ebd24120
children
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1 /*
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2 * Copyright (c) 2013, 2014, 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 map from registers to frame slots. This can be used to describe where callee saved registers
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29 * are saved in a callee's frame.
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30 */
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31 public final class RegisterSaveLayout {
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32
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33 /**
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34 * Keys.
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35 */
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36 private final Register[] registers;
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37
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38 /**
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39 * Slot indexes relative to stack pointer.
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40 */
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41 private final int[] slots;
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42
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43 /**
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44 * Creates a map from registers to frame slots.
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45 *
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46 * @param registers the keys in the map
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47 * @param slots frame slot index for each register in {@code registers}
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48 */
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49 public RegisterSaveLayout(Register[] registers, int[] slots) {
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50 assert registers.length == slots.length;
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51 this.registers = registers;
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52 this.slots = slots;
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53 assert registersToSlots(false).size() == registers.length : "non-unique registers";
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54 assert new HashSet<>(registersToSlots(false).values()).size() == slots.length : "non-unqiue slots";
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55 }
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56
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57 /**
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58 * Gets the frame slot index for a given register.
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59 *
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60 * @param register register to get the frame slot index for
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61 * @return frame slot index
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62 */
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63 public int registerToSlot(Register register) {
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64 for (int i = 0; i < registers.length; i++) {
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65 if (register.equals(registers[i])) {
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66 return slots[i];
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67 }
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68 }
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69 throw new IllegalArgumentException(register + " not saved by this layout: " + this);
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70 }
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71
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72 /**
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73 * Gets this layout information as a {@link Map} from registers to slots.
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74 */
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75 public Map<Register, Integer> registersToSlots(boolean sorted) {
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76 Map<Register, Integer> result;
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77 if (sorted) {
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78 result = new TreeMap<>();
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79 } else {
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80 result = new HashMap<>();
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81 }
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82 for (int i = 0; i < registers.length; i++) {
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83 result.put(registers[i], slots[i]);
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84 }
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85 return result;
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86 }
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87
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88 /**
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89 * Gets this layout information as a {@link Map} from slots to registers.
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90 */
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91 public Map<Integer, Register> slotsToRegisters(boolean sorted) {
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92 Map<Integer, Register> result;
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93 if (sorted) {
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94 result = new TreeMap<>();
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95 } else {
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96 result = new HashMap<>();
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97 }
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98 for (int i = 0; i < registers.length; i++) {
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99 result.put(slots[i], registers[i]);
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100 }
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101 return result;
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102 }
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103
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104 @Override
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105 public int hashCode() {
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106 throw new UnsupportedOperationException();
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107 }
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108
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109 @Override
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110 public boolean equals(Object obj) {
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111 if (this == obj) {
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112 return true;
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113 }
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114 if (obj instanceof RegisterSaveLayout) {
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115 RegisterSaveLayout that = (RegisterSaveLayout) obj;
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116 if (Arrays.equals(registers, that.registers) && Arrays.equals(slots, that.slots)) {
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117 return true;
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118 }
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119 }
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120 return false;
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121 }
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122
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123 @Override
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124 public String toString() {
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125 return registersToSlots(true).toString();
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126 }
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127 }