Mercurial > hg > truffle
annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/CalleeSaveLayout.java @ 21607:71b338926f2e
moved JVMCI classes into their own distributions (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 29 May 2015 22:27:38 +0200 |
parents | f5b549811bac |
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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 com.oracle.jvmci.meta.PlatformKind; |
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26 import java.util.*; |
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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 used to save (and restore) the |
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30 * values of the caller's registers. This class describes the layout of a CSA in terms of its |
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31 * {@linkplain #size size}, {@linkplain #slotSize slot size} and the {@linkplain #registers callee |
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32 * save registers} covered by the CSA. |
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33 */ |
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34 public class CalleeSaveLayout { |
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35 |
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36 /** |
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37 * The size (in bytes) of the CSA. |
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38 */ |
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39 public final int size; |
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40 |
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41 /** |
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42 * The size (in bytes) of an {@linkplain #registerAt(int) indexable} slot in the CSA. |
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43 */ |
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44 public final int slotSize; |
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45 |
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46 /** |
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47 * Map from {@linkplain Register#number register numbers} to slot indexes in the CSA. |
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48 */ |
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49 private final int[] regNumToIndex; |
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50 |
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51 private final Register[] indexToReg; |
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52 |
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53 /** |
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54 * The list of registers {@linkplain #contains(int) contained} by this CSA. |
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55 */ |
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56 public final Register[] registers; |
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57 |
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58 /** |
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59 * The offset from the frame pointer to the CSA. If this is not known, then this field will have |
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60 * the value {@link Integer#MAX_VALUE}. |
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61 */ |
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62 public final int frameOffsetToCSA; |
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63 |
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64 /** |
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65 * Creates a CSA layout. |
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66 * |
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67 * @param size size (in bytes) of the CSA. If this is {@code -1}, then the CSA size will be |
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68 * computed from {@code registers}. |
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69 * @param slotSize the size (in bytes) of an {@linkplain #registerAt(int) indexable} slot in the |
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70 * CSA |
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71 * @param registers the registers that can be saved in the CSA |
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72 */ |
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73 public CalleeSaveLayout(TargetDescription target, int frameOffsetToCSA, int size, int slotSize, Register... registers) { |
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74 this.frameOffsetToCSA = frameOffsetToCSA; |
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75 assert slotSize == 0 || CodeUtil.isPowerOf2(slotSize); |
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76 this.slotSize = slotSize; |
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77 int maxRegNum = -1; |
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78 int maxOffset = 0; |
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79 this.registers = registers; |
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80 int offset = 0; |
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81 for (Register reg : registers) { |
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82 assert offset % slotSize == 0; |
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83 assert reg.number >= 0; |
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84 if (reg.number > maxRegNum) { |
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85 maxRegNum = reg.number; |
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86 } |
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87 if (offset > maxOffset) { |
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88 maxOffset = offset; |
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89 } |
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90 PlatformKind kind = target.arch.getLargestStorableKind(reg.getRegisterCategory()); |
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91 offset += target.getSizeInBytes(kind); |
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92 } |
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93 if (size == -1) { |
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94 this.size = offset; |
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95 } else { |
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96 assert offset <= size; |
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97 this.size = size; |
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98 } |
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99 |
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100 this.regNumToIndex = new int[maxRegNum + 1]; |
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101 this.indexToReg = offset == 0 ? new Register[0] : new Register[offset / slotSize]; |
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102 Arrays.fill(regNumToIndex, -1); |
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103 offset = 0; |
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104 for (Register reg : registers) { |
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105 int index = offset / slotSize; |
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106 regNumToIndex[reg.number] = index; |
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107 indexToReg[index] = reg; |
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108 PlatformKind kind = target.arch.getLargestStorableKind(reg.getRegisterCategory()); |
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109 offset += target.getSizeInBytes(kind); |
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110 } |
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111 } |
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112 |
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113 /** |
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114 * Gets the offset of a given register in the CSA. |
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115 * |
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116 * @return the offset (in bytes) of {@code reg} in the CSA |
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117 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA |
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118 */ |
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119 public int offsetOf(int reg) { |
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120 return indexOf(reg) * slotSize; |
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121 } |
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122 |
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123 /** |
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124 * Gets the index of a given register in the CSA. |
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125 * |
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126 * @return the index of {@code reg} in the CSA |
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127 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA |
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128 */ |
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129 public int indexOf(int reg) { |
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130 if (!contains(reg)) { |
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131 throw new IllegalArgumentException(String.valueOf(reg)); |
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132 } |
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133 return regNumToIndex[reg]; |
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134 } |
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135 |
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136 /** |
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137 * Gets the offset of a given register in the CSA. |
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138 * |
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139 * @return the offset (in bytes) of {@code reg} in the CSA |
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140 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA |
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141 */ |
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142 public int offsetOf(Register reg) { |
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143 return offsetOf(reg.number); |
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144 } |
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145 |
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146 /** |
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147 * Determines if the CSA includes a slot for a given register. |
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148 * |
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149 * @param reg the register to test |
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150 * @return true if the CSA contains a slot for {@code reg} |
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151 */ |
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152 public boolean contains(int reg) { |
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153 return reg >= 0 && reg < regNumToIndex.length && regNumToIndex[reg] != -1; |
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154 } |
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155 |
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156 /** |
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157 * Gets the register whose slot in the CSA is at a given index. |
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158 * |
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159 * @param index an index of a slot in the CSA |
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160 * @return the register whose slot in the CSA is at {@code index} or {@code null} if |
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161 * {@code index} does not denote a slot in the CSA aligned with a register |
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162 */ |
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163 public Register registerAt(int index) { |
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164 if (index < 0 || index >= indexToReg.length) { |
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165 return null; |
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166 } |
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167 return indexToReg[index]; |
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168 } |
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169 |
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170 @Override |
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171 public String toString() { |
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172 StringBuilder sb = new StringBuilder("["); |
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173 for (Register reg : registers) { |
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174 if (sb.length() != 1) { |
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175 sb.append(", "); |
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176 } |
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177 sb.append(reg).append("{+").append(offsetOf(reg)).append('}'); |
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178 } |
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179 return sb.append("] size=").append(size).toString(); |
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180 } |
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181 } |