Mercurial > hg > graal-compiler

annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCalleeSaveLayout.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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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.sun.cri.ci;
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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 /**
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29 * The callee save area (CSA) is a contiguous space in a stack frame
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30 * used to save (and restore) the values of the caller's registers.
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31 * This class describes the layout of a CSA in terms of its
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32 * {@linkplain #size size}, {@linkplain #slotSize slot size} and
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33 * the {@linkplain #registers callee save registers} covered by the CSA.
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34 */
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35 public class CiCalleeSaveLayout {
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36
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37 /**
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38 * The size (in bytes) of the CSA.
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39 */
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40 public final int size;
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41
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42 /**
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43 * The size (in bytes) of an {@linkplain #registerAtIndex(int) indexable} slot in the CSA.
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44 */
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45 public final int slotSize;
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46
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47 /**
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48 * Map from {@linkplain CiRegister#number register numbers} to slot indexes in the CSA.
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49 */
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50 private final int[] regNumToIndex;
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51
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52 private final CiRegister[] indexToReg;
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53
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54 /**
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55 * The list of registers {@linkplain #contains(CiRegister) contained} by this CSA.
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56 */
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57 public final CiRegister[] registers;
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58
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59 /**
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60 * The offset from the frame pointer to the CSA. If this is not known, then this field
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61 * will have the value {@link Integer#MAX_VALUE}.
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62 */
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63 public final int frameOffsetToCSA;
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64
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65 /**
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66 * Creates a CSA layout.
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67 *
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68 * @param size size (in bytes) of the CSA. If this is {@code -1}, then the CSA size will be computed from {@code registers}.
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69 * @param slotSize the size (in bytes) of an {@linkplain #registerAtIndex(int) indexable} slot in the CSA
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70 * @param registers the registers that can be saved in the CSA
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71 */
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72 public CiCalleeSaveLayout(int frameOffsetToCSA, int size, int slotSize, CiRegister... registers) {
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73 this.frameOffsetToCSA = frameOffsetToCSA;
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74 assert slotSize == 0 || CiUtil.isPowerOf2(slotSize);
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75 this.slotSize = slotSize;
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76 int maxRegNum = -1;
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77 int maxOffset = 0;
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78 this.registers = registers;
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79 int offset = 0;
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80 for (CiRegister reg : registers) {
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81 assert offset % slotSize == 0;
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82 assert reg.number >= 0;
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83 if (reg.number > maxRegNum) {
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84 maxRegNum = reg.number;
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85 }
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86 if (offset > maxOffset) {
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87 maxOffset = offset;
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88 }
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89 offset += reg.spillSlotSize;
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90 }
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91 if (size == -1) {
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92 this.size = offset;
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93 } else {
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94 assert offset <= size;
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95 this.size = size;
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96 }
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97 size = this.size;
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98
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99 this.regNumToIndex = new int[maxRegNum + 1];
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100 this.indexToReg = offset == 0 ? new CiRegister[0] : new CiRegister[offset / slotSize];
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101 Arrays.fill(regNumToIndex, -1);
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102 offset = 0;
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103 for (CiRegister reg : registers) {
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104 int index = offset / slotSize;
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105 regNumToIndex[reg.number] = index;
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106 indexToReg[index] = reg;
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107 offset += reg.spillSlotSize;
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108 }
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109 }
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110
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111 /**
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112 * Gets the offset of a given register in the CSA.
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113 *
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114 * @return the offset (in bytes) of {@code reg} in the CSA
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115 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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116 */
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117 public int offsetOf(int reg) {
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118 return indexOf(reg) * slotSize;
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119 }
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120
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121 /**
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122 * Gets the index of a given register in the CSA.
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123 *
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124 * @return the index of {@code reg} in the CSA
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125 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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126 */
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127 public int indexOf(int reg) {
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128 if (!contains(reg)) {
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129 throw new IllegalArgumentException(String.valueOf(reg));
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130 }
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131 return regNumToIndex[reg];
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132 }
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133
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134 /**
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135 * Gets the offset of a given register in the CSA.
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136 *
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137 * @return the offset (in bytes) of {@code reg} in the CSA
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138 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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139 */
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140 public int offsetOf(CiRegister reg) {
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141 return offsetOf(reg.number);
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142 }
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143
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144 /**
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145 * Determines if the CSA includes a slot for a given register.
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146 *
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147 * @param reg the register to test
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148 * @return true if the CSA contains a slot for {@code reg}
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149 */
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150 public boolean contains(int reg) {
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151 return reg >= 0 && reg < regNumToIndex.length && regNumToIndex[reg] != -1;
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152 }
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153
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154 /**
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155 * Gets the register whose slot in the CSA is at a given index.
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156 *
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157 * @param index an index of a slot in the CSA
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158 * @return the register whose slot in the CSA is at {@code index} or {@code null} if {@code index} does not denote a
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159 * slot in the CSA aligned with a register
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160 */
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161 public CiRegister registerAt(int index) {
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162 if (index < 0 || index >= indexToReg.length) {
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163 return null;
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164 }
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165 return indexToReg[index];
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166 }
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167
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168 @Override
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169 public String toString() {
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170 StringBuilder sb = new StringBuilder("[");
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171 for (CiRegister reg : registers) {
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172 if (sb.length() != 1) {
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173 sb.append(", ");
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174 }
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175 sb.append(reg).append("{+").append(offsetOf(reg)).append('}');
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176 }
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177 return sb.append("] size=").append(size).toString();
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178 }
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179 }