Mercurial > hg > truffle

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