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annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/CalleeSaveLayout.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/CalleeSaveLayout.java@1cde96b96673
children 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 /**
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30 * The callee save area (CSA) is a contiguous space in a stack frame used to save (and restore) the
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31 * values of the caller's registers. 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 the {@linkplain #registers callee
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33 * save registers} covered by the CSA.
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34 */
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35 public class CalleeSaveLayout {
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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 #registerAt(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 Register#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 Register[] indexToReg;
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53
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54 /**
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55 * The list of registers {@linkplain #contains(int) contained} by this CSA.
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56 */
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57 public final Register[] 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 will have
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61 * 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
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69 * computed from {@code registers}.
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70 * @param slotSize the size (in bytes) of an {@linkplain #registerAt(int) indexable} slot in the
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71 * CSA
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72 * @param registers the registers that can be saved in the CSA
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73 */
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74 public CalleeSaveLayout(TargetDescription target, int frameOffsetToCSA, int size, int slotSize, Register... registers) {
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75 this.frameOffsetToCSA = frameOffsetToCSA;
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76 assert slotSize == 0 || CodeUtil.isPowerOf2(slotSize);
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77 this.slotSize = slotSize;
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78 int maxRegNum = -1;
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79 int maxOffset = 0;
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80 this.registers = registers;
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81 int offset = 0;
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82 for (Register reg : registers) {
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83 assert offset % slotSize == 0;
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84 assert reg.number >= 0;
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85 if (reg.number > maxRegNum) {
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86 maxRegNum = reg.number;
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87 }
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88 if (offset > maxOffset) {
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89 maxOffset = offset;
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90 }
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91 PlatformKind kind = target.arch.getLargestStorableKind(reg.getRegisterCategory());
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92 offset += target.getSizeInBytes(kind);
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93 }
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94 if (size == -1) {
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95 this.size = offset;
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96 } else {
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97 assert offset <= size;
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98 this.size = size;
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99 }
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100
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101 this.regNumToIndex = new int[maxRegNum + 1];
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102 this.indexToReg = offset == 0 ? new Register[0] : new Register[offset / slotSize];
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103 Arrays.fill(regNumToIndex, -1);
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104 offset = 0;
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105 for (Register reg : registers) {
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106 int index = offset / slotSize;
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107 regNumToIndex[reg.number] = index;
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108 indexToReg[index] = reg;
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109 PlatformKind kind = target.arch.getLargestStorableKind(reg.getRegisterCategory());
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110 offset += target.getSizeInBytes(kind);
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111 }
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112 }
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113
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114 /**
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115 * Gets the offset of a given register in the CSA.
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116 *
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117 * @return the offset (in bytes) of {@code reg} in the CSA
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118 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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119 */
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120 public int offsetOf(int reg) {
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121 return indexOf(reg) * slotSize;
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122 }
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123
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124 /**
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125 * Gets the index of a given register in the CSA.
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126 *
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127 * @return the index of {@code reg} in the CSA
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128 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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129 */
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130 public int indexOf(int reg) {
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131 if (!contains(reg)) {
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132 throw new IllegalArgumentException(String.valueOf(reg));
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133 }
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134 return regNumToIndex[reg];
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135 }
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136
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137 /**
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138 * Gets the offset of a given register in the CSA.
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139 *
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140 * @return the offset (in bytes) of {@code reg} in the CSA
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141 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA
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142 */
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143 public int offsetOf(Register reg) {
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144 return offsetOf(reg.number);
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145 }
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146
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147 /**
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148 * Determines if the CSA includes a slot for a given register.
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149 *
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150 * @param reg the register to test
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151 * @return true if the CSA contains a slot for {@code reg}
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152 */
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153 public boolean contains(int reg) {
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154 return reg >= 0 && reg < regNumToIndex.length && regNumToIndex[reg] != -1;
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155 }
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156
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157 /**
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158 * Gets the register whose slot in the CSA is at a given index.
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159 *
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160 * @param index an index of a slot in the CSA
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161 * @return the register whose slot in the CSA is at {@code index} or {@code null} if
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162 * {@code index} does not denote a slot in the CSA aligned with a register
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163 */
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164 public Register registerAt(int index) {
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165 if (index < 0 || index >= indexToReg.length) {
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166 return null;
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167 }
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168 return indexToReg[index];
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169 }
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170
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171 @Override
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172 public String toString() {
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173 StringBuilder sb = new StringBuilder("[");
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174 for (Register reg : registers) {
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175 if (sb.length() != 1) {
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176 sb.append(", ");
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177 }
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178 sb.append(reg).append("{+").append(offsetOf(reg)).append('}');
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179 }
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180 return sb.append("] size=").append(size).toString();
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181 }
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182 }