Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiStackSlot.java @ 4142:bc8527f3071c
Adjust code base to new level of warnings.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 18 Dec 2011 05:24:06 +0100 |
parents | e233f5660da4 |
children | f5328dda9714 |
rev | line source |
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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 /** |
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26 * Represents a compiler spill slot or an outgoing stack-based argument in a method's frame |
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27 * or an incoming stack-based argument in a method's {@linkplain #inCallerFrame() caller's frame}. |
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28 */ |
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29 public final class CiStackSlot extends CiValue { |
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30 |
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31 /** |
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32 * |
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33 */ |
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34 private static final long serialVersionUID = -7725071921307318433L; |
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35 |
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36 /** |
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37 * @see CiStackSlot#index() |
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38 */ |
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39 private final int index; |
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40 |
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41 /** |
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42 * Gets a {@link CiStackSlot} instance representing a stack slot in the current frame |
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43 * at a given index holding a value of a given kind. |
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44 * |
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45 * @param kind the kind of the value stored in the stack slot |
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46 * @param index the index of the stack slot |
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47 */ |
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48 public static CiStackSlot get(CiKind kind, int index) { |
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49 return get(kind, index, false); |
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50 } |
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51 |
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52 /** |
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53 * Gets a {@link CiStackSlot} instance representing a stack slot at a given index |
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54 * holding a value of a given kind. |
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55 * |
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56 * @param kind the kind of the value stored in the stack slot |
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57 * @param index the index of the stack slot |
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58 * @param inCallerFrame specifies if the slot is in the current frame or in the caller's frame |
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59 */ |
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60 public static CiStackSlot get(CiKind kind, int index, boolean inCallerFrame) { |
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61 assert kind.stackKind() == kind; |
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62 CiStackSlot[][] cache = inCallerFrame ? CALLER_FRAME_CACHE : CACHE; |
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63 CiStackSlot[] slots = cache[kind.ordinal()]; |
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64 CiStackSlot slot; |
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65 if (index < slots.length) { |
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66 slot = slots[index]; |
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67 } else { |
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68 slot = new CiStackSlot(kind, inCallerFrame ? -(index + 1) : index); |
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69 } |
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70 assert slot.inCallerFrame() == inCallerFrame; |
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71 return slot; |
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72 } |
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73 |
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74 /** |
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75 * Private constructor to enforce use of {@link #get(CiKind, int)} so that the |
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76 * shared instance {@linkplain #CACHE cache} is used. |
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77 */ |
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78 private CiStackSlot(CiKind kind, int index) { |
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79 super(kind); |
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80 this.index = index; |
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81 } |
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82 |
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83 /** |
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84 * Gets the index of this stack slot. If this is a spill slot or outgoing stack argument to a call, |
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85 * then the index is relative to the current frame pointer. Otherwise this is an incoming stack |
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86 * argument and the index is relative to the caller frame pointer. |
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87 * |
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88 * @return the index of this slot |
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89 * @see #inCallerFrame() |
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90 */ |
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91 public int index() { |
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92 return index < 0 ? -(index + 1) : index; |
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93 } |
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94 |
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95 @Override |
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96 public int hashCode() { |
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97 return kind.ordinal() + index; |
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98 } |
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99 |
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100 @Override |
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101 public boolean equals(Object o) { |
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102 if (o == this) { |
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103 return true; |
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104 } |
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105 if (o instanceof CiStackSlot) { |
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106 CiStackSlot l = (CiStackSlot) o; |
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107 return l.kind == kind && l.index == index; |
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108 } |
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109 return false; |
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110 } |
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111 |
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112 @Override |
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113 public boolean equalsIgnoringKind(CiValue o) { |
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114 if (o == this) { |
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115 return true; |
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116 } |
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117 if (o instanceof CiStackSlot) { |
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118 CiStackSlot l = (CiStackSlot) o; |
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119 return l.index == index; |
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120 } |
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121 return false; |
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122 } |
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123 |
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124 @Override |
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125 public String name() { |
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126 return (inCallerFrame() ? "caller-stack" : "stack:") + index(); |
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127 } |
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128 |
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129 /** |
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130 * Determines if this is a stack slot in the caller's frame. |
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131 */ |
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132 public boolean inCallerFrame() { |
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133 return index < 0; |
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134 } |
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135 |
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136 /** |
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137 * Gets this stack slot used to pass an argument from the perspective of a caller. |
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138 */ |
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139 public CiStackSlot asOutArg() { |
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140 if (inCallerFrame()) { |
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141 return get(kind, index(), false); |
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142 } |
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143 return this; |
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144 } |
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145 |
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146 /** |
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147 * Gets this stack slot used to pass an argument from the perspective of a callee. |
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148 */ |
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149 public CiStackSlot asInArg() { |
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150 if (!inCallerFrame()) { |
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151 return get(kind, index(), true); |
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152 } |
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153 return this; |
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154 } |
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155 |
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156 /** |
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157 * Default size of the cache to generate per kind. |
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158 */ |
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159 private static final int CACHE_PER_KIND_SIZE = 100; |
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160 |
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161 private static final int CALLER_FRAME_CACHE_PER_KIND_SIZE = 10; |
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162 |
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163 /** |
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164 * A cache of {@linkplain #inCallerFrame() non-caller-frame} stack slots. |
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165 */ |
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166 private static final CiStackSlot[][] CACHE = makeCache(CACHE_PER_KIND_SIZE, false); |
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167 |
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168 /** |
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169 * A cache of {@linkplain #inCallerFrame() caller-frame} stack slots. |
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170 */ |
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171 private static final CiStackSlot[][] CALLER_FRAME_CACHE = makeCache(CALLER_FRAME_CACHE_PER_KIND_SIZE, true); |
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172 |
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173 private static CiStackSlot[][] makeCache(int cachePerKindSize, boolean inCallerFrame) { |
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174 CiStackSlot[][] cache = new CiStackSlot[CiKind.VALUES.length][]; |
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175 cache[CiKind.Illegal.ordinal()] = makeCacheForKind(CiKind.Illegal, cachePerKindSize, inCallerFrame); |
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176 cache[CiKind.Int.ordinal()] = makeCacheForKind(CiKind.Int, cachePerKindSize, inCallerFrame); |
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177 cache[CiKind.Long.ordinal()] = makeCacheForKind(CiKind.Long, cachePerKindSize, inCallerFrame); |
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178 cache[CiKind.Float.ordinal()] = makeCacheForKind(CiKind.Float, cachePerKindSize, inCallerFrame); |
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179 cache[CiKind.Double.ordinal()] = makeCacheForKind(CiKind.Double, cachePerKindSize, inCallerFrame); |
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180 cache[CiKind.Object.ordinal()] = makeCacheForKind(CiKind.Object, cachePerKindSize, inCallerFrame); |
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181 cache[CiKind.Jsr.ordinal()] = makeCacheForKind(CiKind.Jsr, cachePerKindSize, inCallerFrame); |
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182 return cache; |
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183 } |
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184 |
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185 /** |
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186 * Creates an array of {@code CiStackSlot} objects for a given {@link CiKind}. |
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187 * The {@link #index} values range from {@code 0} to {@code count - 1}. |
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188 * |
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189 * @param kind the {@code CiKind} of the stack slot |
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190 * @param count the size of the array to create |
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191 * @return the generated {@code CiStackSlot} array |
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192 */ |
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193 private static CiStackSlot[] makeCacheForKind(CiKind kind, int count, boolean inCallerFrame) { |
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194 CiStackSlot[] slots = new CiStackSlot[count]; |
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195 for (int i = 0; i < count; ++i) { |
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196 slots[i] = new CiStackSlot(kind, inCallerFrame ? -(i + 1) : i); |
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197 } |
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198 return slots; |
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199 } |
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200 } |